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hostapd/src/common/dpp.c
Jouni Malinen c54227c26a DPP2: Replace connectionStatus object ssid with ssid64 
The UTF-8 encoded ssid string was replaced with base64url encoded ssid64
string, so update the implementation to match.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
2019-11-27 15:34:38 +02:00

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/*
* DPP functionality shared between hostapd and wpa_supplicant
* Copyright (c) 2017, Qualcomm Atheros, Inc.
* Copyright (c) 2018-2019, The Linux Foundation
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include <fcntl.h>
#include <openssl/opensslv.h>
#include <openssl/err.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include "utils/common.h"
#include "utils/base64.h"
#include "utils/json.h"
#include "utils/ip_addr.h"
#include "utils/eloop.h"
#include "common/ieee802_11_common.h"
#include "common/ieee802_11_defs.h"
#include "common/wpa_ctrl.h"
#include "common/gas.h"
#include "crypto/crypto.h"
#include "crypto/random.h"
#include "crypto/aes.h"
#include "crypto/aes_siv.h"
#include "crypto/sha384.h"
#include "crypto/sha512.h"
#include "drivers/driver.h"
#include "dpp.h"
#ifdef CONFIG_TESTING_OPTIONS
enum dpp_test_behavior dpp_test = DPP_TEST_DISABLED;
u8 dpp_pkex_own_mac_override[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
u8 dpp_pkex_peer_mac_override[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
u8 dpp_pkex_ephemeral_key_override[600];
size_t dpp_pkex_ephemeral_key_override_len = 0;
u8 dpp_protocol_key_override[600];
size_t dpp_protocol_key_override_len = 0;
u8 dpp_nonce_override[DPP_MAX_NONCE_LEN];
size_t dpp_nonce_override_len = 0;
static int dpp_test_gen_invalid_key(struct wpabuf *msg,
const struct dpp_curve_params *curve);
#endif /* CONFIG_TESTING_OPTIONS */
#if OPENSSL_VERSION_NUMBER < 0x10100000L || \
(defined(LIBRESSL_VERSION_NUMBER) && \
LIBRESSL_VERSION_NUMBER < 0x20700000L)
/* Compatibility wrappers for older versions. */
static int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
{
sig->r = r;
sig->s = s;
return 1;
}
static void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr,
const BIGNUM **ps)
{
if (pr)
*pr = sig->r;
if (ps)
*ps = sig->s;
}
#endif
struct dpp_connection {
struct dl_list list;
struct dpp_controller *ctrl;
struct dpp_relay_controller *relay;
struct dpp_global *global;
struct dpp_authentication *auth;
int sock;
u8 mac_addr[ETH_ALEN];
unsigned int freq;
u8 msg_len[4];
size_t msg_len_octets;
struct wpabuf *msg;
struct wpabuf *msg_out;
size_t msg_out_pos;
unsigned int read_eloop:1;
unsigned int write_eloop:1;
unsigned int on_tcp_tx_complete_gas_done:1;
unsigned int on_tcp_tx_complete_remove:1;
unsigned int on_tcp_tx_complete_auth_ok:1;
};
/* Remote Controller */
struct dpp_relay_controller {
struct dl_list list;
struct dpp_global *global;
u8 pkhash[SHA256_MAC_LEN];
struct hostapd_ip_addr ipaddr;
void *cb_ctx;
void (*tx)(void *ctx, const u8 *addr, unsigned int freq, const u8 *msg,
size_t len);
void (*gas_resp_tx)(void *ctx, const u8 *addr, u8 dialog_token,
int prot, struct wpabuf *buf);
struct dl_list conn; /* struct dpp_connection */
};
/* Local Controller */
struct dpp_controller {
struct dpp_global *global;
u8 allowed_roles;
int qr_mutual;
int sock;
struct dl_list conn; /* struct dpp_connection */
char *configurator_params;
};
struct dpp_global {
void *msg_ctx;
struct dl_list bootstrap; /* struct dpp_bootstrap_info */
struct dl_list configurator; /* struct dpp_configurator */
#ifdef CONFIG_DPP2
struct dl_list controllers; /* struct dpp_relay_controller */
struct dpp_controller *controller;
struct dl_list tcp_init; /* struct dpp_connection */
void *cb_ctx;
int (*process_conf_obj)(void *ctx, struct dpp_authentication *auth);
#endif /* CONFIG_DPP2 */
};
static const struct dpp_curve_params dpp_curves[] = {
/* The mandatory to support and the default NIST P-256 curve needs to
* be the first entry on this list. */
{ "prime256v1", 32, 32, 16, 32, "P-256", 19, "ES256" },
{ "secp384r1", 48, 48, 24, 48, "P-384", 20, "ES384" },
{ "secp521r1", 64, 64, 32, 66, "P-521", 21, "ES512" },
{ "brainpoolP256r1", 32, 32, 16, 32, "BP-256", 28, "BS256" },
{ "brainpoolP384r1", 48, 48, 24, 48, "BP-384", 29, "BS384" },
{ "brainpoolP512r1", 64, 64, 32, 64, "BP-512", 30, "BS512" },
{ NULL, 0, 0, 0, 0, NULL, 0, NULL }
};
/* Role-specific elements for PKEX */
/* NIST P-256 */
static const u8 pkex_init_x_p256[32] = {
0x56, 0x26, 0x12, 0xcf, 0x36, 0x48, 0xfe, 0x0b,
0x07, 0x04, 0xbb, 0x12, 0x22, 0x50, 0xb2, 0x54,
0xb1, 0x94, 0x64, 0x7e, 0x54, 0xce, 0x08, 0x07,
0x2e, 0xec, 0xca, 0x74, 0x5b, 0x61, 0x2d, 0x25
};
static const u8 pkex_init_y_p256[32] = {
0x3e, 0x44, 0xc7, 0xc9, 0x8c, 0x1c, 0xa1, 0x0b,
0x20, 0x09, 0x93, 0xb2, 0xfd, 0xe5, 0x69, 0xdc,
0x75, 0xbc, 0xad, 0x33, 0xc1, 0xe7, 0xc6, 0x45,
0x4d, 0x10, 0x1e, 0x6a, 0x3d, 0x84, 0x3c, 0xa4
};
static const u8 pkex_resp_x_p256[32] = {
0x1e, 0xa4, 0x8a, 0xb1, 0xa4, 0xe8, 0x42, 0x39,
0xad, 0x73, 0x07, 0xf2, 0x34, 0xdf, 0x57, 0x4f,
0xc0, 0x9d, 0x54, 0xbe, 0x36, 0x1b, 0x31, 0x0f,
0x59, 0x91, 0x52, 0x33, 0xac, 0x19, 0x9d, 0x76
};
static const u8 pkex_resp_y_p256[32] = {
0xd9, 0xfb, 0xf6, 0xb9, 0xf5, 0xfa, 0xdf, 0x19,
0x58, 0xd8, 0x3e, 0xc9, 0x89, 0x7a, 0x35, 0xc1,
0xbd, 0xe9, 0x0b, 0x77, 0x7a, 0xcb, 0x91, 0x2a,
0xe8, 0x21, 0x3f, 0x47, 0x52, 0x02, 0x4d, 0x67
};
/* NIST P-384 */
static const u8 pkex_init_x_p384[48] = {
0x95, 0x3f, 0x42, 0x9e, 0x50, 0x7f, 0xf9, 0xaa,
0xac, 0x1a, 0xf2, 0x85, 0x2e, 0x64, 0x91, 0x68,
0x64, 0xc4, 0x3c, 0xb7, 0x5c, 0xf8, 0xc9, 0x53,
0x6e, 0x58, 0x4c, 0x7f, 0xc4, 0x64, 0x61, 0xac,
0x51, 0x8a, 0x6f, 0xfe, 0xab, 0x74, 0xe6, 0x12,
0x81, 0xac, 0x38, 0x5d, 0x41, 0xe6, 0xb9, 0xa3
};
static const u8 pkex_init_y_p384[48] = {
0x76, 0x2f, 0x68, 0x84, 0xa6, 0xb0, 0x59, 0x29,
0x83, 0xa2, 0x6c, 0xa4, 0x6c, 0x3b, 0xf8, 0x56,
0x76, 0x11, 0x2a, 0x32, 0x90, 0xbd, 0x07, 0xc7,
0x37, 0x39, 0x9d, 0xdb, 0x96, 0xf3, 0x2b, 0xb6,
0x27, 0xbb, 0x29, 0x3c, 0x17, 0x33, 0x9d, 0x94,
0xc3, 0xda, 0xac, 0x46, 0xb0, 0x8e, 0x07, 0x18
};
static const u8 pkex_resp_x_p384[48] = {
0xad, 0xbe, 0xd7, 0x1d, 0x3a, 0x71, 0x64, 0x98,
0x5f, 0xb4, 0xd6, 0x4b, 0x50, 0xd0, 0x84, 0x97,
0x4b, 0x7e, 0x57, 0x70, 0xd2, 0xd9, 0xf4, 0x92,
0x2a, 0x3f, 0xce, 0x99, 0xc5, 0x77, 0x33, 0x44,
0x14, 0x56, 0x92, 0xcb, 0xae, 0x46, 0x64, 0xdf,
0xe0, 0xbb, 0xd7, 0xb1, 0x29, 0x20, 0x72, 0xdf
};
static const u8 pkex_resp_y_p384[48] = {
0xab, 0xa7, 0xdf, 0x52, 0xaa, 0xe2, 0x35, 0x0c,
0xe3, 0x75, 0x32, 0xe6, 0xbf, 0x06, 0xc8, 0x7c,
0x38, 0x29, 0x4c, 0xec, 0x82, 0xac, 0xd7, 0xa3,
0x09, 0xd2, 0x0e, 0x22, 0x5a, 0x74, 0x52, 0xa1,
0x7e, 0x54, 0x4e, 0xfe, 0xc6, 0x29, 0x33, 0x63,
0x15, 0xe1, 0x7b, 0xe3, 0x40, 0x1c, 0xca, 0x06
};
/* NIST P-521 */
static const u8 pkex_init_x_p521[66] = {
0x00, 0x16, 0x20, 0x45, 0x19, 0x50, 0x95, 0x23,
0x0d, 0x24, 0xbe, 0x00, 0x87, 0xdc, 0xfa, 0xf0,
0x58, 0x9a, 0x01, 0x60, 0x07, 0x7a, 0xca, 0x76,
0x01, 0xab, 0x2d, 0x5a, 0x46, 0xcd, 0x2c, 0xb5,
0x11, 0x9a, 0xff, 0xaa, 0x48, 0x04, 0x91, 0x38,
0xcf, 0x86, 0xfc, 0xa4, 0xa5, 0x0f, 0x47, 0x01,
0x80, 0x1b, 0x30, 0xa3, 0xae, 0xe8, 0x1c, 0x2e,
0xea, 0xcc, 0xf0, 0x03, 0x9f, 0x77, 0x4c, 0x8d,
0x97, 0x76
};
static const u8 pkex_init_y_p521[66] = {
0x00, 0xb3, 0x8e, 0x02, 0xe4, 0x2a, 0x63, 0x59,
0x12, 0xc6, 0x10, 0xba, 0x3a, 0xf9, 0x02, 0x99,
0x3f, 0x14, 0xf0, 0x40, 0xde, 0x5c, 0xc9, 0x8b,
0x02, 0x55, 0xfa, 0x91, 0xb1, 0xcc, 0x6a, 0xbd,
0xe5, 0x62, 0xc0, 0xc5, 0xe3, 0xa1, 0x57, 0x9f,
0x08, 0x1a, 0xa6, 0xe2, 0xf8, 0x55, 0x90, 0xbf,
0xf5, 0xa6, 0xc3, 0xd8, 0x52, 0x1f, 0xb7, 0x02,
0x2e, 0x7c, 0xc8, 0xb3, 0x20, 0x1e, 0x79, 0x8d,
0x03, 0xa8
};
static const u8 pkex_resp_x_p521[66] = {
0x00, 0x79, 0xe4, 0x4d, 0x6b, 0x5e, 0x12, 0x0a,
0x18, 0x2c, 0xb3, 0x05, 0x77, 0x0f, 0xc3, 0x44,
0x1a, 0xcd, 0x78, 0x46, 0x14, 0xee, 0x46, 0x3f,
0xab, 0xc9, 0x59, 0x7c, 0x85, 0xa0, 0xc2, 0xfb,
0x02, 0x32, 0x99, 0xde, 0x5d, 0xe1, 0x0d, 0x48,
0x2d, 0x71, 0x7d, 0x8d, 0x3f, 0x61, 0x67, 0x9e,
0x2b, 0x8b, 0x12, 0xde, 0x10, 0x21, 0x55, 0x0a,
0x5b, 0x2d, 0xe8, 0x05, 0x09, 0xf6, 0x20, 0x97,
0x84, 0xb4
};
static const u8 pkex_resp_y_p521[66] = {
0x00, 0x46, 0x63, 0x39, 0xbe, 0xcd, 0xa4, 0x2d,
0xca, 0x27, 0x74, 0xd4, 0x1b, 0x91, 0x33, 0x20,
0x83, 0xc7, 0x3b, 0xa4, 0x09, 0x8b, 0x8e, 0xa3,
0x88, 0xe9, 0x75, 0x7f, 0x56, 0x7b, 0x38, 0x84,
0x62, 0x02, 0x7c, 0x90, 0x51, 0x07, 0xdb, 0xe9,
0xd0, 0xde, 0xda, 0x9a, 0x5d, 0xe5, 0x94, 0xd2,
0xcf, 0x9d, 0x4c, 0x33, 0x91, 0xa6, 0xc3, 0x80,
0xa7, 0x6e, 0x7e, 0x8d, 0xf8, 0x73, 0x6e, 0x53,
0xce, 0xe1
};
/* Brainpool P-256r1 */
static const u8 pkex_init_x_bp_p256r1[32] = {
0x46, 0x98, 0x18, 0x6c, 0x27, 0xcd, 0x4b, 0x10,
0x7d, 0x55, 0xa3, 0xdd, 0x89, 0x1f, 0x9f, 0xca,
0xc7, 0x42, 0x5b, 0x8a, 0x23, 0xed, 0xf8, 0x75,
0xac, 0xc7, 0xe9, 0x8d, 0xc2, 0x6f, 0xec, 0xd8
};
static const u8 pkex_init_y_bp_p256r1[32] = {
0x93, 0xca, 0xef, 0xa9, 0x66, 0x3e, 0x87, 0xcd,
0x52, 0x6e, 0x54, 0x13, 0xef, 0x31, 0x67, 0x30,
0x15, 0x13, 0x9d, 0x6d, 0xc0, 0x95, 0x32, 0xbe,
0x4f, 0xab, 0x5d, 0xf7, 0xbf, 0x5e, 0xaa, 0x0b
};
static const u8 pkex_resp_x_bp_p256r1[32] = {
0x90, 0x18, 0x84, 0xc9, 0xdc, 0xcc, 0xb5, 0x2f,
0x4a, 0x3f, 0x4f, 0x18, 0x0a, 0x22, 0x56, 0x6a,
0xa9, 0xef, 0xd4, 0xe6, 0xc3, 0x53, 0xc2, 0x1a,
0x23, 0x54, 0xdd, 0x08, 0x7e, 0x10, 0xd8, 0xe3
};
static const u8 pkex_resp_y_bp_p256r1[32] = {
0x2a, 0xfa, 0x98, 0x9b, 0xe3, 0xda, 0x30, 0xfd,
0x32, 0x28, 0xcb, 0x66, 0xfb, 0x40, 0x7f, 0xf2,
0xb2, 0x25, 0x80, 0x82, 0x44, 0x85, 0x13, 0x7e,
0x4b, 0xb5, 0x06, 0xc0, 0x03, 0x69, 0x23, 0x64
};
/* Brainpool P-384r1 */
static const u8 pkex_init_x_bp_p384r1[48] = {
0x0a, 0x2c, 0xeb, 0x49, 0x5e, 0xb7, 0x23, 0xbd,
0x20, 0x5b, 0xe0, 0x49, 0xdf, 0xcf, 0xcf, 0x19,
0x37, 0x36, 0xe1, 0x2f, 0x59, 0xdb, 0x07, 0x06,
0xb5, 0xeb, 0x2d, 0xae, 0xc2, 0xb2, 0x38, 0x62,
0xa6, 0x73, 0x09, 0xa0, 0x6c, 0x0a, 0xa2, 0x30,
0x99, 0xeb, 0xf7, 0x1e, 0x47, 0xb9, 0x5e, 0xbe
};
static const u8 pkex_init_y_bp_p384r1[48] = {
0x54, 0x76, 0x61, 0x65, 0x75, 0x5a, 0x2f, 0x99,
0x39, 0x73, 0xca, 0x6c, 0xf9, 0xf7, 0x12, 0x86,
0x54, 0xd5, 0xd4, 0xad, 0x45, 0x7b, 0xbf, 0x32,
0xee, 0x62, 0x8b, 0x9f, 0x52, 0xe8, 0xa0, 0xc9,
0xb7, 0x9d, 0xd1, 0x09, 0xb4, 0x79, 0x1c, 0x3e,
0x1a, 0xbf, 0x21, 0x45, 0x66, 0x6b, 0x02, 0x52
};
static const u8 pkex_resp_x_bp_p384r1[48] = {
0x03, 0xa2, 0x57, 0xef, 0xe8, 0x51, 0x21, 0xa0,
0xc8, 0x9e, 0x21, 0x02, 0xb5, 0x9a, 0x36, 0x25,
0x74, 0x22, 0xd1, 0xf2, 0x1b, 0xa8, 0x9a, 0x9b,
0x97, 0xbc, 0x5a, 0xeb, 0x26, 0x15, 0x09, 0x71,
0x77, 0x59, 0xec, 0x8b, 0xb7, 0xe1, 0xe8, 0xce,
0x65, 0xb8, 0xaf, 0xf8, 0x80, 0xae, 0x74, 0x6c
};
static const u8 pkex_resp_y_bp_p384r1[48] = {
0x2f, 0xd9, 0x6a, 0xc7, 0x3e, 0xec, 0x76, 0x65,
0x2d, 0x38, 0x7f, 0xec, 0x63, 0x26, 0x3f, 0x04,
0xd8, 0x4e, 0xff, 0xe1, 0x0a, 0x51, 0x74, 0x70,
0xe5, 0x46, 0x63, 0x7f, 0x5c, 0xc0, 0xd1, 0x7c,
0xfb, 0x2f, 0xea, 0xe2, 0xd8, 0x0f, 0x84, 0xcb,
0xe9, 0x39, 0x5c, 0x64, 0xfe, 0xcb, 0x2f, 0xf1
};
/* Brainpool P-512r1 */
static const u8 pkex_init_x_bp_p512r1[64] = {
0x4c, 0xe9, 0xb6, 0x1c, 0xe2, 0x00, 0x3c, 0x9c,
0xa9, 0xc8, 0x56, 0x52, 0xaf, 0x87, 0x3e, 0x51,
0x9c, 0xbb, 0x15, 0x31, 0x1e, 0xc1, 0x05, 0xfc,
0x7c, 0x77, 0xd7, 0x37, 0x61, 0x27, 0xd0, 0x95,
0x98, 0xee, 0x5d, 0xa4, 0x3d, 0x09, 0xdb, 0x3d,
0xfa, 0x89, 0x9e, 0x7f, 0xa6, 0xa6, 0x9c, 0xff,
0x83, 0x5c, 0x21, 0x6c, 0x3e, 0xf2, 0xfe, 0xdc,
0x63, 0xe4, 0xd1, 0x0e, 0x75, 0x45, 0x69, 0x0f
};
static const u8 pkex_init_y_bp_p512r1[64] = {
0x50, 0xb5, 0x9b, 0xfa, 0x45, 0x67, 0x75, 0x94,
0x44, 0xe7, 0x68, 0xb0, 0xeb, 0x3e, 0xb3, 0xb8,
0xf9, 0x99, 0x05, 0xef, 0xae, 0x6c, 0xbc, 0xe3,
0xe1, 0xd2, 0x51, 0x54, 0xdf, 0x59, 0xd4, 0x45,
0x41, 0x3a, 0xa8, 0x0b, 0x76, 0x32, 0x44, 0x0e,
0x07, 0x60, 0x3a, 0x6e, 0xbe, 0xfe, 0xe0, 0x58,
0x52, 0xa0, 0xaa, 0x8b, 0xd8, 0x5b, 0xf2, 0x71,
0x11, 0x9a, 0x9e, 0x8f, 0x1a, 0xd1, 0xc9, 0x99
};
static const u8 pkex_resp_x_bp_p512r1[64] = {
0x2a, 0x60, 0x32, 0x27, 0xa1, 0xe6, 0x94, 0x72,
0x1c, 0x48, 0xbe, 0xc5, 0x77, 0x14, 0x30, 0x76,
0xe4, 0xbf, 0xf7, 0x7b, 0xc5, 0xfd, 0xdf, 0x19,
0x1e, 0x0f, 0xdf, 0x1c, 0x40, 0xfa, 0x34, 0x9e,
0x1f, 0x42, 0x24, 0xa3, 0x2c, 0xd5, 0xc7, 0xc9,
0x7b, 0x47, 0x78, 0x96, 0xf1, 0x37, 0x0e, 0x88,
0xcb, 0xa6, 0x52, 0x29, 0xd7, 0xa8, 0x38, 0x29,
0x8e, 0x6e, 0x23, 0x47, 0xd4, 0x4b, 0x70, 0x3e
};
static const u8 pkex_resp_y_bp_p512r1[64] = {
0x80, 0x1f, 0x43, 0xd2, 0x17, 0x35, 0xec, 0x81,
0xd9, 0x4b, 0xdc, 0x81, 0x19, 0xd9, 0x5f, 0x68,
0x16, 0x84, 0xfe, 0x63, 0x4b, 0x8d, 0x5d, 0xaa,
0x88, 0x4a, 0x47, 0x48, 0xd4, 0xea, 0xab, 0x7d,
0x6a, 0xbf, 0xe1, 0x28, 0x99, 0x6a, 0x87, 0x1c,
0x30, 0xb4, 0x44, 0x2d, 0x75, 0xac, 0x35, 0x09,
0x73, 0x24, 0x3d, 0xb4, 0x43, 0xb1, 0xc1, 0x56,
0x56, 0xad, 0x30, 0x87, 0xf4, 0xc3, 0x00, 0xc7
};
static void dpp_debug_print_point(const char *title, const EC_GROUP *group,
const EC_POINT *point)
{
BIGNUM *x, *y;
BN_CTX *ctx;
char *x_str = NULL, *y_str = NULL;
if (!wpa_debug_show_keys)
return;
ctx = BN_CTX_new();
x = BN_new();
y = BN_new();
if (!ctx || !x || !y ||
EC_POINT_get_affine_coordinates_GFp(group, point, x, y, ctx) != 1)
goto fail;
x_str = BN_bn2hex(x);
y_str = BN_bn2hex(y);
if (!x_str || !y_str)
goto fail;
wpa_printf(MSG_DEBUG, "%s (%s,%s)", title, x_str, y_str);
fail:
OPENSSL_free(x_str);
OPENSSL_free(y_str);
BN_free(x);
BN_free(y);
BN_CTX_free(ctx);
}
static int dpp_hash_vector(const struct dpp_curve_params *curve,
size_t num_elem, const u8 *addr[], const size_t *len,
u8 *mac)
{
if (curve->hash_len == 32)
return sha256_vector(num_elem, addr, len, mac);
if (curve->hash_len == 48)
return sha384_vector(num_elem, addr, len, mac);
if (curve->hash_len == 64)
return sha512_vector(num_elem, addr, len, mac);
return -1;
}
static int dpp_hkdf_expand(size_t hash_len, const u8 *secret, size_t secret_len,
const char *label, u8 *out, size_t outlen)
{
if (hash_len == 32)
return hmac_sha256_kdf(secret, secret_len, NULL,
(const u8 *) label, os_strlen(label),
out, outlen);
if (hash_len == 48)
return hmac_sha384_kdf(secret, secret_len, NULL,
(const u8 *) label, os_strlen(label),
out, outlen);
if (hash_len == 64)
return hmac_sha512_kdf(secret, secret_len, NULL,
(const u8 *) label, os_strlen(label),
out, outlen);
return -1;
}
static int dpp_hmac_vector(size_t hash_len, const u8 *key, size_t key_len,
size_t num_elem, const u8 *addr[],
const size_t *len, u8 *mac)
{
if (hash_len == 32)
return hmac_sha256_vector(key, key_len, num_elem, addr, len,
mac);
if (hash_len == 48)
return hmac_sha384_vector(key, key_len, num_elem, addr, len,
mac);
if (hash_len == 64)
return hmac_sha512_vector(key, key_len, num_elem, addr, len,
mac);
return -1;
}
static int dpp_hmac(size_t hash_len, const u8 *key, size_t key_len,
const u8 *data, size_t data_len, u8 *mac)
{
if (hash_len == 32)
return hmac_sha256(key, key_len, data, data_len, mac);
if (hash_len == 48)
return hmac_sha384(key, key_len, data, data_len, mac);
if (hash_len == 64)
return hmac_sha512(key, key_len, data, data_len, mac);
return -1;
}
static int dpp_bn2bin_pad(const BIGNUM *bn, u8 *pos, size_t len)
{
int num_bytes, offset;
num_bytes = BN_num_bytes(bn);
if ((size_t) num_bytes > len)
return -1;
offset = len - num_bytes;
os_memset(pos, 0, offset);
BN_bn2bin(bn, pos + offset);
return 0;
}
static struct wpabuf * dpp_get_pubkey_point(EVP_PKEY *pkey, int prefix)
{
int len, res;
EC_KEY *eckey;
struct wpabuf *buf;
unsigned char *pos;
eckey = EVP_PKEY_get1_EC_KEY(pkey);
if (!eckey)
return NULL;
EC_KEY_set_conv_form(eckey, POINT_CONVERSION_UNCOMPRESSED);
len = i2o_ECPublicKey(eckey, NULL);
if (len <= 0) {
wpa_printf(MSG_ERROR,
"DDP: Failed to determine public key encoding length");
EC_KEY_free(eckey);
return NULL;
}
buf = wpabuf_alloc(len);
if (!buf) {
EC_KEY_free(eckey);
return NULL;
}
pos = wpabuf_put(buf, len);
res = i2o_ECPublicKey(eckey, &pos);
EC_KEY_free(eckey);
if (res != len) {
wpa_printf(MSG_ERROR,
"DDP: Failed to encode public key (res=%d/%d)",
res, len);
wpabuf_free(buf);
return NULL;
}
if (!prefix) {
/* Remove 0x04 prefix to match DPP definition */
pos = wpabuf_mhead(buf);
os_memmove(pos, pos + 1, len - 1);
buf->used--;
}
return buf;
}
static EVP_PKEY * dpp_set_pubkey_point_group(const EC_GROUP *group,
const u8 *buf_x, const u8 *buf_y,
size_t len)
{
EC_KEY *eckey = NULL;
BN_CTX *ctx;
EC_POINT *point = NULL;
BIGNUM *x = NULL, *y = NULL;
EVP_PKEY *pkey = NULL;
ctx = BN_CTX_new();
if (!ctx) {
wpa_printf(MSG_ERROR, "DPP: Out of memory");
return NULL;
}
point = EC_POINT_new(group);
x = BN_bin2bn(buf_x, len, NULL);
y = BN_bin2bn(buf_y, len, NULL);
if (!point || !x || !y) {
wpa_printf(MSG_ERROR, "DPP: Out of memory");
goto fail;
}
if (!EC_POINT_set_affine_coordinates_GFp(group, point, x, y, ctx)) {
wpa_printf(MSG_ERROR,
"DPP: OpenSSL: EC_POINT_set_affine_coordinates_GFp failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
if (!EC_POINT_is_on_curve(group, point, ctx) ||
EC_POINT_is_at_infinity(group, point)) {
wpa_printf(MSG_ERROR, "DPP: Invalid point");
goto fail;
}
dpp_debug_print_point("DPP: dpp_set_pubkey_point_group", group, point);
eckey = EC_KEY_new();
if (!eckey ||
EC_KEY_set_group(eckey, group) != 1 ||
EC_KEY_set_public_key(eckey, point) != 1) {
wpa_printf(MSG_ERROR,
"DPP: Failed to set EC_KEY: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
EC_KEY_set_asn1_flag(eckey, OPENSSL_EC_NAMED_CURVE);
pkey = EVP_PKEY_new();
if (!pkey || EVP_PKEY_set1_EC_KEY(pkey, eckey) != 1) {
wpa_printf(MSG_ERROR, "DPP: Could not create EVP_PKEY");
goto fail;
}
out:
BN_free(x);
BN_free(y);
EC_KEY_free(eckey);
EC_POINT_free(point);
BN_CTX_free(ctx);
return pkey;
fail:
EVP_PKEY_free(pkey);
pkey = NULL;
goto out;
}
static EVP_PKEY * dpp_set_pubkey_point(EVP_PKEY *group_key,
const u8 *buf, size_t len)
{
EC_KEY *eckey;
const EC_GROUP *group;
EVP_PKEY *pkey = NULL;
if (len & 1)
return NULL;
eckey = EVP_PKEY_get1_EC_KEY(group_key);
if (!eckey) {
wpa_printf(MSG_ERROR,
"DPP: Could not get EC_KEY from group_key");
return NULL;
}
group = EC_KEY_get0_group(eckey);
if (group)
pkey = dpp_set_pubkey_point_group(group, buf, buf + len / 2,
len / 2);
else
wpa_printf(MSG_ERROR, "DPP: Could not get EC group");
EC_KEY_free(eckey);
return pkey;
}
static int dpp_ecdh(EVP_PKEY *own, EVP_PKEY *peer,
u8 *secret, size_t *secret_len)
{
EVP_PKEY_CTX *ctx;
int ret = -1;
ERR_clear_error();
*secret_len = 0;
ctx = EVP_PKEY_CTX_new(own, NULL);
if (!ctx) {
wpa_printf(MSG_ERROR, "DPP: EVP_PKEY_CTX_new failed: %s",
ERR_error_string(ERR_get_error(), NULL));
return -1;
}
if (EVP_PKEY_derive_init(ctx) != 1) {
wpa_printf(MSG_ERROR, "DPP: EVP_PKEY_derive_init failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
if (EVP_PKEY_derive_set_peer(ctx, peer) != 1) {
wpa_printf(MSG_ERROR,
"DPP: EVP_PKEY_derive_set_peet failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
if (EVP_PKEY_derive(ctx, NULL, secret_len) != 1) {
wpa_printf(MSG_ERROR, "DPP: EVP_PKEY_derive(NULL) failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
if (*secret_len > DPP_MAX_SHARED_SECRET_LEN) {
u8 buf[200];
int level = *secret_len > 200 ? MSG_ERROR : MSG_DEBUG;
/* It looks like OpenSSL can return unexpectedly large buffer
* need for shared secret from EVP_PKEY_derive(NULL) in some
* cases. For example, group 19 has shown cases where secret_len
* is set to 72 even though the actual length ends up being
* updated to 32 when EVP_PKEY_derive() is called with a buffer
* for the value. Work around this by trying to fetch the value
* and continue if it is within supported range even when the
* initial buffer need is claimed to be larger. */
wpa_printf(level,
"DPP: Unexpected secret_len=%d from EVP_PKEY_derive()",
(int) *secret_len);
if (*secret_len > 200)
goto fail;
if (EVP_PKEY_derive(ctx, buf, secret_len) != 1) {
wpa_printf(MSG_ERROR, "DPP: EVP_PKEY_derive failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
if (*secret_len > DPP_MAX_SHARED_SECRET_LEN) {
wpa_printf(MSG_ERROR,
"DPP: Unexpected secret_len=%d from EVP_PKEY_derive()",
(int) *secret_len);
goto fail;
}
wpa_hexdump_key(MSG_DEBUG, "DPP: Unexpected secret_len change",
buf, *secret_len);
os_memcpy(secret, buf, *secret_len);
forced_memzero(buf, sizeof(buf));
goto done;
}
if (EVP_PKEY_derive(ctx, secret, secret_len) != 1) {
wpa_printf(MSG_ERROR, "DPP: EVP_PKEY_derive failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
done:
ret = 0;
fail:
EVP_PKEY_CTX_free(ctx);
return ret;
}
static void dpp_auth_fail(struct dpp_authentication *auth, const char *txt)
{
wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_FAIL "%s", txt);
}
struct wpabuf * dpp_alloc_msg(enum dpp_public_action_frame_type type,
size_t len)
{
struct wpabuf *msg;
msg = wpabuf_alloc(8 + len);
if (!msg)
return NULL;
wpabuf_put_u8(msg, WLAN_ACTION_PUBLIC);
wpabuf_put_u8(msg, WLAN_PA_VENDOR_SPECIFIC);
wpabuf_put_be24(msg, OUI_WFA);
wpabuf_put_u8(msg, DPP_OUI_TYPE);
wpabuf_put_u8(msg, 1); /* Crypto Suite */
wpabuf_put_u8(msg, type);
return msg;
}
const u8 * dpp_get_attr(const u8 *buf, size_t len, u16 req_id, u16 *ret_len)
{
u16 id, alen;
const u8 *pos = buf, *end = buf + len;
while (end - pos >= 4) {
id = WPA_GET_LE16(pos);
pos += 2;
alen = WPA_GET_LE16(pos);
pos += 2;
if (alen > end - pos)
return NULL;
if (id == req_id) {
*ret_len = alen;
return pos;
}
pos += alen;
}
return NULL;
}
static const u8 * dpp_get_attr_next(const u8 *prev, const u8 *buf, size_t len,
u16 req_id, u16 *ret_len)
{
u16 id, alen;
const u8 *pos, *end = buf + len;
if (!prev)
pos = buf;
else
pos = prev + WPA_GET_LE16(prev - 2);
while (end - pos >= 4) {
id = WPA_GET_LE16(pos);
pos += 2;
alen = WPA_GET_LE16(pos);
pos += 2;
if (alen > end - pos)
return NULL;
if (id == req_id) {
*ret_len = alen;
return pos;
}
pos += alen;
}
return NULL;
}
int dpp_check_attrs(const u8 *buf, size_t len)
{
const u8 *pos, *end;
int wrapped_data = 0;
pos = buf;
end = buf + len;
while (end - pos >= 4) {
u16 id, alen;
id = WPA_GET_LE16(pos);
pos += 2;
alen = WPA_GET_LE16(pos);
pos += 2;
wpa_printf(MSG_MSGDUMP, "DPP: Attribute ID %04x len %u",
id, alen);
if (alen > end - pos) {
wpa_printf(MSG_DEBUG,
"DPP: Truncated message - not enough room for the attribute - dropped");
return -1;
}
if (wrapped_data) {
wpa_printf(MSG_DEBUG,
"DPP: An unexpected attribute included after the Wrapped Data attribute");
return -1;
}
if (id == DPP_ATTR_WRAPPED_DATA)
wrapped_data = 1;
pos += alen;
}
if (end != pos) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected octets (%d) after the last attribute",
(int) (end - pos));
return -1;
}
return 0;
}
void dpp_bootstrap_info_free(struct dpp_bootstrap_info *info)
{
if (!info)
return;
os_free(info->uri);
os_free(info->info);
EVP_PKEY_free(info->pubkey);
os_free(info);
}
const char * dpp_bootstrap_type_txt(enum dpp_bootstrap_type type)
{
switch (type) {
case DPP_BOOTSTRAP_QR_CODE:
return "QRCODE";
case DPP_BOOTSTRAP_PKEX:
return "PKEX";
}
return "??";
}
static int dpp_uri_valid_info(const char *info)
{
while (*info) {
unsigned char val = *info++;
if (val < 0x20 || val > 0x7e || val == 0x3b)
return 0;
}
return 1;
}
static int dpp_clone_uri(struct dpp_bootstrap_info *bi, const char *uri)
{
bi->uri = os_strdup(uri);
return bi->uri ? 0 : -1;
}
int dpp_parse_uri_chan_list(struct dpp_bootstrap_info *bi,
const char *chan_list)
{
const char *pos = chan_list, *pos2;
int opclass = -1, channel, freq;
while (pos && *pos && *pos != ';') {
pos2 = pos;
while (*pos2 >= '0' && *pos2 <= '9')
pos2++;
if (*pos2 == '/') {
opclass = atoi(pos);
pos = pos2 + 1;
}
if (opclass <= 0)
goto fail;
channel = atoi(pos);
if (channel <= 0)
goto fail;
while (*pos >= '0' && *pos <= '9')
pos++;
freq = ieee80211_chan_to_freq(NULL, opclass, channel);
wpa_printf(MSG_DEBUG,
"DPP: URI channel-list: opclass=%d channel=%d ==> freq=%d",
opclass, channel, freq);
if (freq < 0) {
wpa_printf(MSG_DEBUG,
"DPP: Ignore unknown URI channel-list channel (opclass=%d channel=%d)",
opclass, channel);
} else if (bi->num_freq == DPP_BOOTSTRAP_MAX_FREQ) {
wpa_printf(MSG_DEBUG,
"DPP: Too many channels in URI channel-list - ignore list");
bi->num_freq = 0;
break;
} else {
bi->freq[bi->num_freq++] = freq;
}
if (*pos == ';' || *pos == '\0')
break;
if (*pos != ',')
goto fail;
pos++;
}
return 0;
fail:
wpa_printf(MSG_DEBUG, "DPP: Invalid URI channel-list");
return -1;
}
int dpp_parse_uri_mac(struct dpp_bootstrap_info *bi, const char *mac)
{
if (!mac)
return 0;
if (hwaddr_aton2(mac, bi->mac_addr) < 0) {
wpa_printf(MSG_DEBUG, "DPP: Invalid URI mac");
return -1;
}
wpa_printf(MSG_DEBUG, "DPP: URI mac: " MACSTR, MAC2STR(bi->mac_addr));
return 0;
}
int dpp_parse_uri_info(struct dpp_bootstrap_info *bi, const char *info)
{
const char *end;
if (!info)
return 0;
end = os_strchr(info, ';');
if (!end)
end = info + os_strlen(info);
bi->info = os_malloc(end - info + 1);
if (!bi->info)
return -1;
os_memcpy(bi->info, info, end - info);
bi->info[end - info] = '\0';
wpa_printf(MSG_DEBUG, "DPP: URI(information): %s", bi->info);
if (!dpp_uri_valid_info(bi->info)) {
wpa_printf(MSG_DEBUG, "DPP: Invalid URI information payload");
return -1;
}
return 0;
}
static const struct dpp_curve_params *
dpp_get_curve_oid(const ASN1_OBJECT *poid)
{
ASN1_OBJECT *oid;
int i;
for (i = 0; dpp_curves[i].name; i++) {
oid = OBJ_txt2obj(dpp_curves[i].name, 0);
if (oid && OBJ_cmp(poid, oid) == 0)
return &dpp_curves[i];
}
return NULL;
}
static const struct dpp_curve_params * dpp_get_curve_nid(int nid)
{
int i, tmp;
if (!nid)
return NULL;
for (i = 0; dpp_curves[i].name; i++) {
tmp = OBJ_txt2nid(dpp_curves[i].name);
if (tmp == nid)
return &dpp_curves[i];
}
return NULL;
}
static int dpp_parse_uri_pk(struct dpp_bootstrap_info *bi, const char *info)
{
const char *end;
u8 *data;
size_t data_len;
EVP_PKEY *pkey;
const unsigned char *p;
int res;
X509_PUBKEY *pub = NULL;
ASN1_OBJECT *ppkalg;
const unsigned char *pk;
int ppklen;
X509_ALGOR *pa;
#if OPENSSL_VERSION_NUMBER < 0x10100000L || \
(defined(LIBRESSL_VERSION_NUMBER) && \
LIBRESSL_VERSION_NUMBER < 0x20800000L)
ASN1_OBJECT *pa_oid;
#else
const ASN1_OBJECT *pa_oid;
#endif
const void *pval;
int ptype;
const ASN1_OBJECT *poid;
char buf[100];
end = os_strchr(info, ';');
if (!end)
return -1;
data = base64_decode((const unsigned char *) info, end - info,
&data_len);
if (!data) {
wpa_printf(MSG_DEBUG,
"DPP: Invalid base64 encoding on URI public-key");
return -1;
}
wpa_hexdump(MSG_DEBUG, "DPP: Base64 decoded URI public-key",
data, data_len);
if (sha256_vector(1, (const u8 **) &data, &data_len,
bi->pubkey_hash) < 0) {
wpa_printf(MSG_DEBUG, "DPP: Failed to hash public key");
os_free(data);
return -1;
}
wpa_hexdump(MSG_DEBUG, "DPP: Public key hash",
bi->pubkey_hash, SHA256_MAC_LEN);
/* DER encoded ASN.1 SubjectPublicKeyInfo
*
* SubjectPublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier,
* subjectPublicKey BIT STRING }
*
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL }
*
* subjectPublicKey = compressed format public key per ANSI X9.63
* algorithm = ecPublicKey (1.2.840.10045.2.1)
* parameters = shall be present and shall be OBJECT IDENTIFIER; e.g.,
* prime256v1 (1.2.840.10045.3.1.7)
*/
p = data;
pkey = d2i_PUBKEY(NULL, &p, data_len);
os_free(data);
if (!pkey) {
wpa_printf(MSG_DEBUG,
"DPP: Could not parse URI public-key SubjectPublicKeyInfo");
return -1;
}
if (EVP_PKEY_type(EVP_PKEY_id(pkey)) != EVP_PKEY_EC) {
wpa_printf(MSG_DEBUG,
"DPP: SubjectPublicKeyInfo does not describe an EC key");
EVP_PKEY_free(pkey);
return -1;
}
res = X509_PUBKEY_set(&pub, pkey);
if (res != 1) {
wpa_printf(MSG_DEBUG, "DPP: Could not set pubkey");
goto fail;
}
res = X509_PUBKEY_get0_param(&ppkalg, &pk, &ppklen, &pa, pub);
if (res != 1) {
wpa_printf(MSG_DEBUG,
"DPP: Could not extract SubjectPublicKeyInfo parameters");
goto fail;
}
res = OBJ_obj2txt(buf, sizeof(buf), ppkalg, 0);
if (res < 0 || (size_t) res >= sizeof(buf)) {
wpa_printf(MSG_DEBUG,
"DPP: Could not extract SubjectPublicKeyInfo algorithm");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: URI subjectPublicKey algorithm: %s", buf);
if (os_strcmp(buf, "id-ecPublicKey") != 0) {
wpa_printf(MSG_DEBUG,
"DPP: Unsupported SubjectPublicKeyInfo algorithm");
goto fail;
}
X509_ALGOR_get0(&pa_oid, &ptype, (void *) &pval, pa);
if (ptype != V_ASN1_OBJECT) {
wpa_printf(MSG_DEBUG,
"DPP: SubjectPublicKeyInfo parameters did not contain an OID");
goto fail;
}
poid = pval;
res = OBJ_obj2txt(buf, sizeof(buf), poid, 0);
if (res < 0 || (size_t) res >= sizeof(buf)) {
wpa_printf(MSG_DEBUG,
"DPP: Could not extract SubjectPublicKeyInfo parameters OID");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: URI subjectPublicKey parameters: %s", buf);
bi->curve = dpp_get_curve_oid(poid);
if (!bi->curve) {
wpa_printf(MSG_DEBUG,
"DPP: Unsupported SubjectPublicKeyInfo curve: %s",
buf);
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: URI subjectPublicKey", pk, ppklen);
X509_PUBKEY_free(pub);
bi->pubkey = pkey;
return 0;
fail:
X509_PUBKEY_free(pub);
EVP_PKEY_free(pkey);
return -1;
}
static struct dpp_bootstrap_info * dpp_parse_uri(const char *uri)
{
const char *pos = uri;
const char *end;
const char *chan_list = NULL, *mac = NULL, *info = NULL, *pk = NULL;
struct dpp_bootstrap_info *bi;
wpa_hexdump_ascii(MSG_DEBUG, "DPP: URI", uri, os_strlen(uri));
if (os_strncmp(pos, "DPP:", 4) != 0) {
wpa_printf(MSG_INFO, "DPP: Not a DPP URI");
return NULL;
}
pos += 4;
for (;;) {
end = os_strchr(pos, ';');
if (!end)
break;
if (end == pos) {
/* Handle terminating ";;" and ignore unexpected ";"
* for parsing robustness. */
pos++;
continue;
}
if (pos[0] == 'C' && pos[1] == ':' && !chan_list)
chan_list = pos + 2;
else if (pos[0] == 'M' && pos[1] == ':' && !mac)
mac = pos + 2;
else if (pos[0] == 'I' && pos[1] == ':' && !info)
info = pos + 2;
else if (pos[0] == 'K' && pos[1] == ':' && !pk)
pk = pos + 2;
else
wpa_hexdump_ascii(MSG_DEBUG,
"DPP: Ignore unrecognized URI parameter",
pos, end - pos);
pos = end + 1;
}
if (!pk) {
wpa_printf(MSG_INFO, "DPP: URI missing public-key");
return NULL;
}
bi = os_zalloc(sizeof(*bi));
if (!bi)
return NULL;
if (dpp_clone_uri(bi, uri) < 0 ||
dpp_parse_uri_chan_list(bi, chan_list) < 0 ||
dpp_parse_uri_mac(bi, mac) < 0 ||
dpp_parse_uri_info(bi, info) < 0 ||
dpp_parse_uri_pk(bi, pk) < 0) {
dpp_bootstrap_info_free(bi);
bi = NULL;
}
return bi;
}
struct dpp_bootstrap_info * dpp_parse_qr_code(const char *uri)
{
struct dpp_bootstrap_info *bi;
bi = dpp_parse_uri(uri);
if (bi)
bi->type = DPP_BOOTSTRAP_QR_CODE;
return bi;
}
static void dpp_debug_print_key(const char *title, EVP_PKEY *key)
{
EC_KEY *eckey;
BIO *out;
size_t rlen;
char *txt;
int res;
unsigned char *der = NULL;
int der_len;
const EC_GROUP *group;
const EC_POINT *point;
out = BIO_new(BIO_s_mem());
if (!out)
return;
EVP_PKEY_print_private(out, key, 0, NULL);
rlen = BIO_ctrl_pending(out);
txt = os_malloc(rlen + 1);
if (txt) {
res = BIO_read(out, txt, rlen);
if (res > 0) {
txt[res] = '\0';
wpa_printf(MSG_DEBUG, "%s: %s", title, txt);
}
os_free(txt);
}
BIO_free(out);
eckey = EVP_PKEY_get1_EC_KEY(key);
if (!eckey)
return;
group = EC_KEY_get0_group(eckey);
point = EC_KEY_get0_public_key(eckey);
if (group && point)
dpp_debug_print_point(title, group, point);
der_len = i2d_ECPrivateKey(eckey, &der);
if (der_len > 0)
wpa_hexdump_key(MSG_DEBUG, "DPP: ECPrivateKey", der, der_len);
OPENSSL_free(der);
if (der_len <= 0) {
der = NULL;
der_len = i2d_EC_PUBKEY(eckey, &der);
if (der_len > 0)
wpa_hexdump(MSG_DEBUG, "DPP: EC_PUBKEY", der, der_len);
OPENSSL_free(der);
}
EC_KEY_free(eckey);
}
static EVP_PKEY * dpp_gen_keypair(const struct dpp_curve_params *curve)
{
EVP_PKEY_CTX *kctx = NULL;
EC_KEY *ec_params = NULL;
EVP_PKEY *params = NULL, *key = NULL;
int nid;
wpa_printf(MSG_DEBUG, "DPP: Generating a keypair");
nid = OBJ_txt2nid(curve->name);
if (nid == NID_undef) {
wpa_printf(MSG_INFO, "DPP: Unsupported curve %s", curve->name);
return NULL;
}
ec_params = EC_KEY_new_by_curve_name(nid);
if (!ec_params) {
wpa_printf(MSG_ERROR,
"DPP: Failed to generate EC_KEY parameters");
goto fail;
}
EC_KEY_set_asn1_flag(ec_params, OPENSSL_EC_NAMED_CURVE);
params = EVP_PKEY_new();
if (!params || EVP_PKEY_set1_EC_KEY(params, ec_params) != 1) {
wpa_printf(MSG_ERROR,
"DPP: Failed to generate EVP_PKEY parameters");
goto fail;
}
kctx = EVP_PKEY_CTX_new(params, NULL);
if (!kctx ||
EVP_PKEY_keygen_init(kctx) != 1 ||
EVP_PKEY_keygen(kctx, &key) != 1) {
wpa_printf(MSG_ERROR, "DPP: Failed to generate EC key");
key = NULL;
goto fail;
}
if (wpa_debug_show_keys)
dpp_debug_print_key("Own generated key", key);
fail:
EC_KEY_free(ec_params);
EVP_PKEY_free(params);
EVP_PKEY_CTX_free(kctx);
return key;
}
static const struct dpp_curve_params *
dpp_get_curve_name(const char *name)
{
int i;
for (i = 0; dpp_curves[i].name; i++) {
if (os_strcmp(name, dpp_curves[i].name) == 0 ||
(dpp_curves[i].jwk_crv &&
os_strcmp(name, dpp_curves[i].jwk_crv) == 0))
return &dpp_curves[i];
}
return NULL;
}
static const struct dpp_curve_params *
dpp_get_curve_jwk_crv(const char *name)
{
int i;
for (i = 0; dpp_curves[i].name; i++) {
if (dpp_curves[i].jwk_crv &&
os_strcmp(name, dpp_curves[i].jwk_crv) == 0)
return &dpp_curves[i];
}
return NULL;
}
static EVP_PKEY * dpp_set_keypair(const struct dpp_curve_params **curve,
const u8 *privkey, size_t privkey_len)
{
EVP_PKEY *pkey;
EC_KEY *eckey;
const EC_GROUP *group;
int nid;
pkey = EVP_PKEY_new();
if (!pkey)
return NULL;
eckey = d2i_ECPrivateKey(NULL, &privkey, privkey_len);
if (!eckey) {
wpa_printf(MSG_INFO,
"DPP: OpenSSL: d2i_ECPrivateKey() failed: %s",
ERR_error_string(ERR_get_error(), NULL));
EVP_PKEY_free(pkey);
return NULL;
}
group = EC_KEY_get0_group(eckey);
if (!group) {
EC_KEY_free(eckey);
EVP_PKEY_free(pkey);
return NULL;
}
nid = EC_GROUP_get_curve_name(group);
*curve = dpp_get_curve_nid(nid);
if (!*curve) {
wpa_printf(MSG_INFO,
"DPP: Unsupported curve (nid=%d) in pre-assigned key",
nid);
EC_KEY_free(eckey);
EVP_PKEY_free(pkey);
return NULL;
}
if (EVP_PKEY_assign_EC_KEY(pkey, eckey) != 1) {
EC_KEY_free(eckey);
EVP_PKEY_free(pkey);
return NULL;
}
return pkey;
}
typedef struct {
/* AlgorithmIdentifier ecPublicKey with optional parameters present
* as an OID identifying the curve */
X509_ALGOR *alg;
/* Compressed format public key per ANSI X9.63 */
ASN1_BIT_STRING *pub_key;
} DPP_BOOTSTRAPPING_KEY;
ASN1_SEQUENCE(DPP_BOOTSTRAPPING_KEY) = {
ASN1_SIMPLE(DPP_BOOTSTRAPPING_KEY, alg, X509_ALGOR),
ASN1_SIMPLE(DPP_BOOTSTRAPPING_KEY, pub_key, ASN1_BIT_STRING)
} ASN1_SEQUENCE_END(DPP_BOOTSTRAPPING_KEY);
IMPLEMENT_ASN1_FUNCTIONS(DPP_BOOTSTRAPPING_KEY);
static struct wpabuf * dpp_bootstrap_key_der(EVP_PKEY *key)
{
unsigned char *der = NULL;
int der_len;
EC_KEY *eckey;
struct wpabuf *ret = NULL;
size_t len;
const EC_GROUP *group;
const EC_POINT *point;
BN_CTX *ctx;
DPP_BOOTSTRAPPING_KEY *bootstrap = NULL;
int nid;
ctx = BN_CTX_new();
eckey = EVP_PKEY_get1_EC_KEY(key);
if (!ctx || !eckey)
goto fail;
group = EC_KEY_get0_group(eckey);
point = EC_KEY_get0_public_key(eckey);
if (!group || !point)
goto fail;
dpp_debug_print_point("DPP: bootstrap public key", group, point);
nid = EC_GROUP_get_curve_name(group);
bootstrap = DPP_BOOTSTRAPPING_KEY_new();
if (!bootstrap ||
X509_ALGOR_set0(bootstrap->alg, OBJ_nid2obj(EVP_PKEY_EC),
V_ASN1_OBJECT, (void *) OBJ_nid2obj(nid)) != 1)
goto fail;
len = EC_POINT_point2oct(group, point, POINT_CONVERSION_COMPRESSED,
NULL, 0, ctx);
if (len == 0)
goto fail;
der = OPENSSL_malloc(len);
if (!der)
goto fail;
len = EC_POINT_point2oct(group, point, POINT_CONVERSION_COMPRESSED,
der, len, ctx);
OPENSSL_free(bootstrap->pub_key->data);
bootstrap->pub_key->data = der;
der = NULL;
bootstrap->pub_key->length = len;
/* No unused bits */
bootstrap->pub_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
bootstrap->pub_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
der_len = i2d_DPP_BOOTSTRAPPING_KEY(bootstrap, &der);
if (der_len <= 0) {
wpa_printf(MSG_ERROR,
"DDP: Failed to build DER encoded public key");
goto fail;
}
ret = wpabuf_alloc_copy(der, der_len);
fail:
DPP_BOOTSTRAPPING_KEY_free(bootstrap);
OPENSSL_free(der);
EC_KEY_free(eckey);
BN_CTX_free(ctx);
return ret;
}
int dpp_bootstrap_key_hash(struct dpp_bootstrap_info *bi)
{
struct wpabuf *der;
int res;
const u8 *addr[1];
size_t len[1];
der = dpp_bootstrap_key_der(bi->pubkey);
if (!der)
return -1;
wpa_hexdump_buf(MSG_DEBUG, "DPP: Compressed public key (DER)",
der);
addr[0] = wpabuf_head(der);
len[0] = wpabuf_len(der);
res = sha256_vector(1, addr, len, bi->pubkey_hash);
if (res < 0)
wpa_printf(MSG_DEBUG, "DPP: Failed to hash public key");
else
wpa_hexdump(MSG_DEBUG, "DPP: Public key hash", bi->pubkey_hash,
SHA256_MAC_LEN);
wpabuf_free(der);
return res;
}
char * dpp_keygen(struct dpp_bootstrap_info *bi, const char *curve,
const u8 *privkey, size_t privkey_len)
{
unsigned char *base64 = NULL;
char *pos, *end;
size_t len;
struct wpabuf *der = NULL;
const u8 *addr[1];
int res;
if (!curve) {
bi->curve = &dpp_curves[0];
} else {
bi->curve = dpp_get_curve_name(curve);
if (!bi->curve) {
wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s",
curve);
return NULL;
}
}
if (privkey)
bi->pubkey = dpp_set_keypair(&bi->curve, privkey, privkey_len);
else
bi->pubkey = dpp_gen_keypair(bi->curve);
if (!bi->pubkey)
goto fail;
bi->own = 1;
der = dpp_bootstrap_key_der(bi->pubkey);
if (!der)
goto fail;
wpa_hexdump_buf(MSG_DEBUG, "DPP: Compressed public key (DER)",
der);
addr[0] = wpabuf_head(der);
len = wpabuf_len(der);
res = sha256_vector(1, addr, &len, bi->pubkey_hash);
if (res < 0) {
wpa_printf(MSG_DEBUG, "DPP: Failed to hash public key");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Public key hash", bi->pubkey_hash,
SHA256_MAC_LEN);
base64 = base64_encode(wpabuf_head(der), wpabuf_len(der), &len);
wpabuf_free(der);
der = NULL;
if (!base64)
goto fail;
pos = (char *) base64;
end = pos + len;
for (;;) {
pos = os_strchr(pos, '\n');
if (!pos)
break;
os_memmove(pos, pos + 1, end - pos);
}
return (char *) base64;
fail:
os_free(base64);
wpabuf_free(der);
return NULL;
}
static int dpp_derive_k1(const u8 *Mx, size_t Mx_len, u8 *k1,
unsigned int hash_len)
{
u8 salt[DPP_MAX_HASH_LEN], prk[DPP_MAX_HASH_LEN];
const char *info = "first intermediate key";
int res;
/* k1 = HKDF(<>, "first intermediate key", M.x) */
/* HKDF-Extract(<>, M.x) */
os_memset(salt, 0, hash_len);
if (dpp_hmac(hash_len, salt, hash_len, Mx, Mx_len, prk) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM=M.x)",
prk, hash_len);
/* HKDF-Expand(PRK, info, L) */
res = dpp_hkdf_expand(hash_len, prk, hash_len, info, k1, hash_len);
os_memset(prk, 0, hash_len);
if (res < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "DPP: k1 = HKDF-Expand(PRK, info, L)",
k1, hash_len);
return 0;
}
static int dpp_derive_k2(const u8 *Nx, size_t Nx_len, u8 *k2,
unsigned int hash_len)
{
u8 salt[DPP_MAX_HASH_LEN], prk[DPP_MAX_HASH_LEN];
const char *info = "second intermediate key";
int res;
/* k2 = HKDF(<>, "second intermediate key", N.x) */
/* HKDF-Extract(<>, N.x) */
os_memset(salt, 0, hash_len);
res = dpp_hmac(hash_len, salt, hash_len, Nx, Nx_len, prk);
if (res < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM=N.x)",
prk, hash_len);
/* HKDF-Expand(PRK, info, L) */
res = dpp_hkdf_expand(hash_len, prk, hash_len, info, k2, hash_len);
os_memset(prk, 0, hash_len);
if (res < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "DPP: k2 = HKDF-Expand(PRK, info, L)",
k2, hash_len);
return 0;
}
static int dpp_derive_ke(struct dpp_authentication *auth, u8 *ke,
unsigned int hash_len)
{
size_t nonce_len;
u8 nonces[2 * DPP_MAX_NONCE_LEN];
const char *info_ke = "DPP Key";
u8 prk[DPP_MAX_HASH_LEN];
int res;
const u8 *addr[3];
size_t len[3];
size_t num_elem = 0;
if (!auth->Mx_len || !auth->Nx_len) {
wpa_printf(MSG_DEBUG,
"DPP: Mx/Nx not available - cannot derive ke");
return -1;
}
/* ke = HKDF(I-nonce | R-nonce, "DPP Key", M.x | N.x [| L.x]) */
/* HKDF-Extract(I-nonce | R-nonce, M.x | N.x [| L.x]) */
nonce_len = auth->curve->nonce_len;
os_memcpy(nonces, auth->i_nonce, nonce_len);
os_memcpy(&nonces[nonce_len], auth->r_nonce, nonce_len);
addr[num_elem] = auth->Mx;
len[num_elem] = auth->Mx_len;
num_elem++;
addr[num_elem] = auth->Nx;
len[num_elem] = auth->Nx_len;
num_elem++;
if (auth->peer_bi && auth->own_bi) {
if (!auth->Lx_len) {
wpa_printf(MSG_DEBUG,
"DPP: Lx not available - cannot derive ke");
return -1;
}
addr[num_elem] = auth->Lx;
len[num_elem] = auth->secret_len;
num_elem++;
}
res = dpp_hmac_vector(hash_len, nonces, 2 * nonce_len,
num_elem, addr, len, prk);
if (res < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM)",
prk, hash_len);
/* HKDF-Expand(PRK, info, L) */
res = dpp_hkdf_expand(hash_len, prk, hash_len, info_ke, ke, hash_len);
os_memset(prk, 0, hash_len);
if (res < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "DPP: ke = HKDF-Expand(PRK, info, L)",
ke, hash_len);
return 0;
}
static void dpp_build_attr_status(struct wpabuf *msg,
enum dpp_status_error status)
{
wpa_printf(MSG_DEBUG, "DPP: Status %d", status);
wpabuf_put_le16(msg, DPP_ATTR_STATUS);
wpabuf_put_le16(msg, 1);
wpabuf_put_u8(msg, status);
}
static void dpp_build_attr_r_bootstrap_key_hash(struct wpabuf *msg,
const u8 *hash)
{
if (hash) {
wpa_printf(MSG_DEBUG, "DPP: R-Bootstrap Key Hash");
wpabuf_put_le16(msg, DPP_ATTR_R_BOOTSTRAP_KEY_HASH);
wpabuf_put_le16(msg, SHA256_MAC_LEN);
wpabuf_put_data(msg, hash, SHA256_MAC_LEN);
}
}
static void dpp_build_attr_i_bootstrap_key_hash(struct wpabuf *msg,
const u8 *hash)
{
if (hash) {
wpa_printf(MSG_DEBUG, "DPP: I-Bootstrap Key Hash");
wpabuf_put_le16(msg, DPP_ATTR_I_BOOTSTRAP_KEY_HASH);
wpabuf_put_le16(msg, SHA256_MAC_LEN);
wpabuf_put_data(msg, hash, SHA256_MAC_LEN);
}
}
static struct wpabuf * dpp_auth_build_req(struct dpp_authentication *auth,
const struct wpabuf *pi,
size_t nonce_len,
const u8 *r_pubkey_hash,
const u8 *i_pubkey_hash,
unsigned int neg_freq)
{
struct wpabuf *msg;
u8 clear[4 + DPP_MAX_NONCE_LEN + 4 + 1];
u8 wrapped_data[4 + DPP_MAX_NONCE_LEN + 4 + 1 + AES_BLOCK_SIZE];
u8 *pos;
const u8 *addr[2];
size_t len[2], siv_len, attr_len;
u8 *attr_start, *attr_end;
/* Build DPP Authentication Request frame attributes */
attr_len = 2 * (4 + SHA256_MAC_LEN) + 4 + (pi ? wpabuf_len(pi) : 0) +
4 + sizeof(wrapped_data);
if (neg_freq > 0)
attr_len += 4 + 2;
#ifdef CONFIG_DPP2
attr_len += 5;
#endif /* CONFIG_DPP2 */
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_REQ)
attr_len += 5;
#endif /* CONFIG_TESTING_OPTIONS */
msg = dpp_alloc_msg(DPP_PA_AUTHENTICATION_REQ, attr_len);
if (!msg)
return NULL;
attr_start = wpabuf_put(msg, 0);
/* Responder Bootstrapping Key Hash */
dpp_build_attr_r_bootstrap_key_hash(msg, r_pubkey_hash);
/* Initiator Bootstrapping Key Hash */
dpp_build_attr_i_bootstrap_key_hash(msg, i_pubkey_hash);
/* Initiator Protocol Key */
if (pi) {
wpabuf_put_le16(msg, DPP_ATTR_I_PROTOCOL_KEY);
wpabuf_put_le16(msg, wpabuf_len(pi));
wpabuf_put_buf(msg, pi);
}
/* Channel */
if (neg_freq > 0) {
u8 op_class, channel;
if (ieee80211_freq_to_channel_ext(neg_freq, 0, 0, &op_class,
&channel) ==
NUM_HOSTAPD_MODES) {
wpa_printf(MSG_INFO,
"DPP: Unsupported negotiation frequency request: %d",
neg_freq);
wpabuf_free(msg);
return NULL;
}
wpabuf_put_le16(msg, DPP_ATTR_CHANNEL);
wpabuf_put_le16(msg, 2);
wpabuf_put_u8(msg, op_class);
wpabuf_put_u8(msg, channel);
}
#ifdef CONFIG_DPP2
/* Protocol Version */
wpabuf_put_le16(msg, DPP_ATTR_PROTOCOL_VERSION);
wpabuf_put_le16(msg, 1);
wpabuf_put_u8(msg, 2);
#endif /* CONFIG_DPP2 */
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
goto skip_wrapped_data;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* Wrapped data ({I-nonce, I-capabilities}k1) */
pos = clear;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_I_NONCE_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-nonce");
goto skip_i_nonce;
}
if (dpp_test == DPP_TEST_INVALID_I_NONCE_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid I-nonce");
WPA_PUT_LE16(pos, DPP_ATTR_I_NONCE);
pos += 2;
WPA_PUT_LE16(pos, nonce_len - 1);
pos += 2;
os_memcpy(pos, auth->i_nonce, nonce_len - 1);
pos += nonce_len - 1;
goto skip_i_nonce;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* I-nonce */
WPA_PUT_LE16(pos, DPP_ATTR_I_NONCE);
pos += 2;
WPA_PUT_LE16(pos, nonce_len);
pos += 2;
os_memcpy(pos, auth->i_nonce, nonce_len);
pos += nonce_len;
#ifdef CONFIG_TESTING_OPTIONS
skip_i_nonce:
if (dpp_test == DPP_TEST_NO_I_CAPAB_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-capab");
goto skip_i_capab;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* I-capabilities */
WPA_PUT_LE16(pos, DPP_ATTR_I_CAPABILITIES);
pos += 2;
WPA_PUT_LE16(pos, 1);
pos += 2;
auth->i_capab = auth->allowed_roles;
*pos++ = auth->i_capab;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_ZERO_I_CAPAB) {
wpa_printf(MSG_INFO, "DPP: TESTING - zero I-capabilities");
pos[-1] = 0;
}
skip_i_capab:
#endif /* CONFIG_TESTING_OPTIONS */
attr_end = wpabuf_put(msg, 0);
/* OUI, OUI type, Crypto Suite, DPP frame type */
addr[0] = wpabuf_head_u8(msg) + 2;
len[0] = 3 + 1 + 1 + 1;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
/* Attributes before Wrapped Data */
addr[1] = attr_start;
len[1] = attr_end - attr_start;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
siv_len = pos - clear;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", clear, siv_len);
if (aes_siv_encrypt(auth->k1, auth->curve->hash_len, clear, siv_len,
2, addr, len, wrapped_data) < 0) {
wpabuf_free(msg);
return NULL;
}
siv_len += AES_BLOCK_SIZE;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, siv_len);
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, siv_len);
wpabuf_put_data(msg, wrapped_data, siv_len);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
dpp_build_attr_status(msg, DPP_STATUS_OK);
}
skip_wrapped_data:
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump_buf(MSG_DEBUG,
"DPP: Authentication Request frame attributes", msg);
return msg;
}
static struct wpabuf * dpp_auth_build_resp(struct dpp_authentication *auth,
enum dpp_status_error status,
const struct wpabuf *pr,
size_t nonce_len,
const u8 *r_pubkey_hash,
const u8 *i_pubkey_hash,
const u8 *r_nonce, const u8 *i_nonce,
const u8 *wrapped_r_auth,
size_t wrapped_r_auth_len,
const u8 *siv_key)
{
struct wpabuf *msg;
#define DPP_AUTH_RESP_CLEAR_LEN 2 * (4 + DPP_MAX_NONCE_LEN) + 4 + 1 + \
4 + 4 + DPP_MAX_HASH_LEN + AES_BLOCK_SIZE
u8 clear[DPP_AUTH_RESP_CLEAR_LEN];
u8 wrapped_data[DPP_AUTH_RESP_CLEAR_LEN + AES_BLOCK_SIZE];
const u8 *addr[2];
size_t len[2], siv_len, attr_len;
u8 *attr_start, *attr_end, *pos;
auth->waiting_auth_conf = 1;
auth->auth_resp_tries = 0;
/* Build DPP Authentication Response frame attributes */
attr_len = 4 + 1 + 2 * (4 + SHA256_MAC_LEN) +
4 + (pr ? wpabuf_len(pr) : 0) + 4 + sizeof(wrapped_data);
#ifdef CONFIG_DPP2
attr_len += 5;
#endif /* CONFIG_DPP2 */
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_RESP)
attr_len += 5;
#endif /* CONFIG_TESTING_OPTIONS */
msg = dpp_alloc_msg(DPP_PA_AUTHENTICATION_RESP, attr_len);
if (!msg)
return NULL;
attr_start = wpabuf_put(msg, 0);
/* DPP Status */
if (status != 255)
dpp_build_attr_status(msg, status);
/* Responder Bootstrapping Key Hash */
dpp_build_attr_r_bootstrap_key_hash(msg, r_pubkey_hash);
/* Initiator Bootstrapping Key Hash (mutual authentication) */
dpp_build_attr_i_bootstrap_key_hash(msg, i_pubkey_hash);
/* Responder Protocol Key */
if (pr) {
wpabuf_put_le16(msg, DPP_ATTR_R_PROTOCOL_KEY);
wpabuf_put_le16(msg, wpabuf_len(pr));
wpabuf_put_buf(msg, pr);
}
#ifdef CONFIG_DPP2
/* Protocol Version */
wpabuf_put_le16(msg, DPP_ATTR_PROTOCOL_VERSION);
wpabuf_put_le16(msg, 1);
wpabuf_put_u8(msg, 2);
#endif /* CONFIG_DPP2 */
attr_end = wpabuf_put(msg, 0);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
goto skip_wrapped_data;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* Wrapped data ({R-nonce, I-nonce, R-capabilities, {R-auth}ke}k2) */
pos = clear;
if (r_nonce) {
/* R-nonce */
WPA_PUT_LE16(pos, DPP_ATTR_R_NONCE);
pos += 2;
WPA_PUT_LE16(pos, nonce_len);
pos += 2;
os_memcpy(pos, r_nonce, nonce_len);
pos += nonce_len;
}
if (i_nonce) {
/* I-nonce */
WPA_PUT_LE16(pos, DPP_ATTR_I_NONCE);
pos += 2;
WPA_PUT_LE16(pos, nonce_len);
pos += 2;
os_memcpy(pos, i_nonce, nonce_len);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_I_NONCE_MISMATCH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - I-nonce mismatch");
pos[nonce_len / 2] ^= 0x01;
}
#endif /* CONFIG_TESTING_OPTIONS */
pos += nonce_len;
}
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_R_CAPAB_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-capab");
goto skip_r_capab;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* R-capabilities */
WPA_PUT_LE16(pos, DPP_ATTR_R_CAPABILITIES);
pos += 2;
WPA_PUT_LE16(pos, 1);
pos += 2;
auth->r_capab = auth->configurator ? DPP_CAPAB_CONFIGURATOR :
DPP_CAPAB_ENROLLEE;
*pos++ = auth->r_capab;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_ZERO_R_CAPAB) {
wpa_printf(MSG_INFO, "DPP: TESTING - zero R-capabilities");
pos[-1] = 0;
} else if (dpp_test == DPP_TEST_INCOMPATIBLE_R_CAPAB_AUTH_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - incompatible R-capabilities");
if ((auth->i_capab & DPP_CAPAB_ROLE_MASK) ==
(DPP_CAPAB_CONFIGURATOR | DPP_CAPAB_ENROLLEE))
pos[-1] = 0;
else
pos[-1] = auth->configurator ? DPP_CAPAB_ENROLLEE :
DPP_CAPAB_CONFIGURATOR;
}
skip_r_capab:
#endif /* CONFIG_TESTING_OPTIONS */
if (wrapped_r_auth) {
/* {R-auth}ke */
WPA_PUT_LE16(pos, DPP_ATTR_WRAPPED_DATA);
pos += 2;
WPA_PUT_LE16(pos, wrapped_r_auth_len);
pos += 2;
os_memcpy(pos, wrapped_r_auth, wrapped_r_auth_len);
pos += wrapped_r_auth_len;
}
/* OUI, OUI type, Crypto Suite, DPP frame type */
addr[0] = wpabuf_head_u8(msg) + 2;
len[0] = 3 + 1 + 1 + 1;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
/* Attributes before Wrapped Data */
addr[1] = attr_start;
len[1] = attr_end - attr_start;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
siv_len = pos - clear;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", clear, siv_len);
if (aes_siv_encrypt(siv_key, auth->curve->hash_len, clear, siv_len,
2, addr, len, wrapped_data) < 0) {
wpabuf_free(msg);
return NULL;
}
siv_len += AES_BLOCK_SIZE;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, siv_len);
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, siv_len);
wpabuf_put_data(msg, wrapped_data, siv_len);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
dpp_build_attr_status(msg, DPP_STATUS_OK);
}
skip_wrapped_data:
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump_buf(MSG_DEBUG,
"DPP: Authentication Response frame attributes", msg);
return msg;
}
static int dpp_channel_ok_init(struct hostapd_hw_modes *own_modes,
u16 num_modes, unsigned int freq)
{
u16 m;
int c, flag;
if (!own_modes || !num_modes)
return 1;
for (m = 0; m < num_modes; m++) {
for (c = 0; c < own_modes[m].num_channels; c++) {
if ((unsigned int) own_modes[m].channels[c].freq !=
freq)
continue;
flag = own_modes[m].channels[c].flag;
if (!(flag & (HOSTAPD_CHAN_DISABLED |
HOSTAPD_CHAN_NO_IR |
HOSTAPD_CHAN_RADAR)))
return 1;
}
}
wpa_printf(MSG_DEBUG, "DPP: Peer channel %u MHz not supported", freq);
return 0;
}
static int freq_included(const unsigned int freqs[], unsigned int num,
unsigned int freq)
{
while (num > 0) {
if (freqs[--num] == freq)
return 1;
}
return 0;
}
static void freq_to_start(unsigned int freqs[], unsigned int num,
unsigned int freq)
{
unsigned int i;
for (i = 0; i < num; i++) {
if (freqs[i] == freq)
break;
}
if (i == 0 || i >= num)
return;
os_memmove(&freqs[1], &freqs[0], i * sizeof(freqs[0]));
freqs[0] = freq;
}
static int dpp_channel_intersect(struct dpp_authentication *auth,
struct hostapd_hw_modes *own_modes,
u16 num_modes)
{
struct dpp_bootstrap_info *peer_bi = auth->peer_bi;
unsigned int i, freq;
for (i = 0; i < peer_bi->num_freq; i++) {
freq = peer_bi->freq[i];
if (freq_included(auth->freq, auth->num_freq, freq))
continue;
if (dpp_channel_ok_init(own_modes, num_modes, freq))
auth->freq[auth->num_freq++] = freq;
}
if (!auth->num_freq) {
wpa_printf(MSG_INFO,
"DPP: No available channels for initiating DPP Authentication");
return -1;
}
auth->curr_freq = auth->freq[0];
return 0;
}
static int dpp_channel_local_list(struct dpp_authentication *auth,
struct hostapd_hw_modes *own_modes,
u16 num_modes)
{
u16 m;
int c, flag;
unsigned int freq;
auth->num_freq = 0;
if (!own_modes || !num_modes) {
auth->freq[0] = 2412;
auth->freq[1] = 2437;
auth->freq[2] = 2462;
auth->num_freq = 3;
return 0;
}
for (m = 0; m < num_modes; m++) {
for (c = 0; c < own_modes[m].num_channels; c++) {
freq = own_modes[m].channels[c].freq;
flag = own_modes[m].channels[c].flag;
if (flag & (HOSTAPD_CHAN_DISABLED |
HOSTAPD_CHAN_NO_IR |
HOSTAPD_CHAN_RADAR))
continue;
if (freq_included(auth->freq, auth->num_freq, freq))
continue;
auth->freq[auth->num_freq++] = freq;
if (auth->num_freq == DPP_BOOTSTRAP_MAX_FREQ) {
m = num_modes;
break;
}
}
}
return auth->num_freq == 0 ? -1 : 0;
}
static int dpp_prepare_channel_list(struct dpp_authentication *auth,
struct hostapd_hw_modes *own_modes,
u16 num_modes)
{
int res;
char freqs[DPP_BOOTSTRAP_MAX_FREQ * 6 + 10], *pos, *end;
unsigned int i;
if (auth->peer_bi->num_freq > 0)
res = dpp_channel_intersect(auth, own_modes, num_modes);
else
res = dpp_channel_local_list(auth, own_modes, num_modes);
if (res < 0)
return res;
/* Prioritize 2.4 GHz channels 6, 1, 11 (in this order) to hit the most
* likely channels first. */
freq_to_start(auth->freq, auth->num_freq, 2462);
freq_to_start(auth->freq, auth->num_freq, 2412);
freq_to_start(auth->freq, auth->num_freq, 2437);
auth->freq_idx = 0;
auth->curr_freq = auth->freq[0];
pos = freqs;
end = pos + sizeof(freqs);
for (i = 0; i < auth->num_freq; i++) {
res = os_snprintf(pos, end - pos, " %u", auth->freq[i]);
if (os_snprintf_error(end - pos, res))
break;
pos += res;
}
*pos = '\0';
wpa_printf(MSG_DEBUG, "DPP: Possible frequencies for initiating:%s",
freqs);
return 0;
}
static int dpp_autogen_bootstrap_key(struct dpp_authentication *auth)
{
struct dpp_bootstrap_info *bi;
char *pk = NULL;
size_t len;
if (auth->own_bi)
return 0; /* already generated */
bi = os_zalloc(sizeof(*bi));
if (!bi)
return -1;
bi->type = DPP_BOOTSTRAP_QR_CODE;
pk = dpp_keygen(bi, auth->peer_bi->curve->name, NULL, 0);
if (!pk)
goto fail;
len = 4; /* "DPP:" */
len += 4 + os_strlen(pk);
bi->uri = os_malloc(len + 1);
if (!bi->uri)
goto fail;
os_snprintf(bi->uri, len + 1, "DPP:K:%s;;", pk);
wpa_printf(MSG_DEBUG,
"DPP: Auto-generated own bootstrapping key info: URI %s",
bi->uri);
auth->tmp_own_bi = auth->own_bi = bi;
os_free(pk);
return 0;
fail:
os_free(pk);
dpp_bootstrap_info_free(bi);
return -1;
}
struct dpp_authentication * dpp_auth_init(void *msg_ctx,
struct dpp_bootstrap_info *peer_bi,
struct dpp_bootstrap_info *own_bi,
u8 dpp_allowed_roles,
unsigned int neg_freq,
struct hostapd_hw_modes *own_modes,
u16 num_modes)
{
struct dpp_authentication *auth;
size_t nonce_len;
size_t secret_len;
struct wpabuf *pi = NULL;
const u8 *r_pubkey_hash, *i_pubkey_hash;
#ifdef CONFIG_TESTING_OPTIONS
u8 test_hash[SHA256_MAC_LEN];
#endif /* CONFIG_TESTING_OPTIONS */
auth = os_zalloc(sizeof(*auth));
if (!auth)
return NULL;
auth->msg_ctx = msg_ctx;
auth->initiator = 1;
auth->waiting_auth_resp = 1;
auth->allowed_roles = dpp_allowed_roles;
auth->configurator = !!(dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR);
auth->peer_bi = peer_bi;
auth->own_bi = own_bi;
auth->curve = peer_bi->curve;
if (dpp_autogen_bootstrap_key(auth) < 0 ||
dpp_prepare_channel_list(auth, own_modes, num_modes) < 0)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_nonce_override_len > 0) {
wpa_printf(MSG_INFO, "DPP: TESTING - override I-nonce");
nonce_len = dpp_nonce_override_len;
os_memcpy(auth->i_nonce, dpp_nonce_override, nonce_len);
} else {
nonce_len = auth->curve->nonce_len;
if (random_get_bytes(auth->i_nonce, nonce_len)) {
wpa_printf(MSG_ERROR,
"DPP: Failed to generate I-nonce");
goto fail;
}
}
#else /* CONFIG_TESTING_OPTIONS */
nonce_len = auth->curve->nonce_len;
if (random_get_bytes(auth->i_nonce, nonce_len)) {
wpa_printf(MSG_ERROR, "DPP: Failed to generate I-nonce");
goto fail;
}
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", auth->i_nonce, nonce_len);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_protocol_key_override_len) {
const struct dpp_curve_params *tmp_curve;
wpa_printf(MSG_INFO,
"DPP: TESTING - override protocol key");
auth->own_protocol_key = dpp_set_keypair(
&tmp_curve, dpp_protocol_key_override,
dpp_protocol_key_override_len);
} else {
auth->own_protocol_key = dpp_gen_keypair(auth->curve);
}
#else /* CONFIG_TESTING_OPTIONS */
auth->own_protocol_key = dpp_gen_keypair(auth->curve);
#endif /* CONFIG_TESTING_OPTIONS */
if (!auth->own_protocol_key)
goto fail;
pi = dpp_get_pubkey_point(auth->own_protocol_key, 0);
if (!pi)
goto fail;
/* ECDH: M = pI * BR */
if (dpp_ecdh(auth->own_protocol_key, auth->peer_bi->pubkey,
auth->Mx, &secret_len) < 0)
goto fail;
auth->secret_len = secret_len;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (M.x)",
auth->Mx, auth->secret_len);
auth->Mx_len = auth->secret_len;
if (dpp_derive_k1(auth->Mx, auth->secret_len, auth->k1,
auth->curve->hash_len) < 0)
goto fail;
r_pubkey_hash = auth->peer_bi->pubkey_hash;
i_pubkey_hash = auth->own_bi->pubkey_hash;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_R_BOOTSTRAP_KEY_HASH_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Bootstrap Key Hash");
r_pubkey_hash = NULL;
} else if (dpp_test == DPP_TEST_INVALID_R_BOOTSTRAP_KEY_HASH_AUTH_REQ) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid R-Bootstrap Key Hash");
os_memcpy(test_hash, r_pubkey_hash, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
r_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_I_BOOTSTRAP_KEY_HASH_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-Bootstrap Key Hash");
i_pubkey_hash = NULL;
} else if (dpp_test == DPP_TEST_INVALID_I_BOOTSTRAP_KEY_HASH_AUTH_REQ) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid I-Bootstrap Key Hash");
os_memcpy(test_hash, i_pubkey_hash, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
i_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_I_PROTO_KEY_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-Proto Key");
wpabuf_free(pi);
pi = NULL;
} else if (dpp_test == DPP_TEST_INVALID_I_PROTO_KEY_AUTH_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid I-Proto Key");
wpabuf_free(pi);
pi = wpabuf_alloc(2 * auth->curve->prime_len);
if (!pi || dpp_test_gen_invalid_key(pi, auth->curve) < 0)
goto fail;
}
#endif /* CONFIG_TESTING_OPTIONS */
auth->req_msg = dpp_auth_build_req(auth, pi, nonce_len, r_pubkey_hash,
i_pubkey_hash, neg_freq);
if (!auth->req_msg)
goto fail;
out:
wpabuf_free(pi);
return auth;
fail:
dpp_auth_deinit(auth);
auth = NULL;
goto out;
}
static struct wpabuf * dpp_build_conf_req_attr(struct dpp_authentication *auth,
const char *json)
{
size_t nonce_len;
size_t json_len, clear_len;
struct wpabuf *clear = NULL, *msg = NULL;
u8 *wrapped;
size_t attr_len;
wpa_printf(MSG_DEBUG, "DPP: Build configuration request");
nonce_len = auth->curve->nonce_len;
if (random_get_bytes(auth->e_nonce, nonce_len)) {
wpa_printf(MSG_ERROR, "DPP: Failed to generate E-nonce");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: E-nonce", auth->e_nonce, nonce_len);
json_len = os_strlen(json);
wpa_hexdump_ascii(MSG_DEBUG, "DPP: configRequest JSON", json, json_len);
/* { E-nonce, configAttrib }ke */
clear_len = 4 + nonce_len + 4 + json_len;
clear = wpabuf_alloc(clear_len);
attr_len = 4 + clear_len + AES_BLOCK_SIZE;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_REQ)
attr_len += 5;
#endif /* CONFIG_TESTING_OPTIONS */
msg = wpabuf_alloc(attr_len);
if (!clear || !msg)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_E_NONCE_CONF_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no E-nonce");
goto skip_e_nonce;
}
if (dpp_test == DPP_TEST_INVALID_E_NONCE_CONF_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid E-nonce");
wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
wpabuf_put_le16(clear, nonce_len - 1);
wpabuf_put_data(clear, auth->e_nonce, nonce_len - 1);
goto skip_e_nonce;
}
if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_CONF_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
goto skip_wrapped_data;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* E-nonce */
wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
wpabuf_put_le16(clear, nonce_len);
wpabuf_put_data(clear, auth->e_nonce, nonce_len);
#ifdef CONFIG_TESTING_OPTIONS
skip_e_nonce:
if (dpp_test == DPP_TEST_NO_CONFIG_ATTR_OBJ_CONF_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no configAttrib");
goto skip_conf_attr_obj;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* configAttrib */
wpabuf_put_le16(clear, DPP_ATTR_CONFIG_ATTR_OBJ);
wpabuf_put_le16(clear, json_len);
wpabuf_put_data(clear, json, json_len);
#ifdef CONFIG_TESTING_OPTIONS
skip_conf_attr_obj:
#endif /* CONFIG_TESTING_OPTIONS */
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
/* No AES-SIV AD */
wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
wpabuf_head(clear), wpabuf_len(clear),
0, NULL, NULL, wrapped) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
dpp_build_attr_status(msg, DPP_STATUS_OK);
}
skip_wrapped_data:
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump_buf(MSG_DEBUG,
"DPP: Configuration Request frame attributes", msg);
wpabuf_free(clear);
return msg;
fail:
wpabuf_free(clear);
wpabuf_free(msg);
return NULL;
}
static void dpp_write_adv_proto(struct wpabuf *buf)
{
/* Advertisement Protocol IE */
wpabuf_put_u8(buf, WLAN_EID_ADV_PROTO);
wpabuf_put_u8(buf, 8); /* Length */
wpabuf_put_u8(buf, 0x7f);
wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC);
wpabuf_put_u8(buf, 5);
wpabuf_put_be24(buf, OUI_WFA);
wpabuf_put_u8(buf, DPP_OUI_TYPE);
wpabuf_put_u8(buf, 0x01);
}
static void dpp_write_gas_query(struct wpabuf *buf, struct wpabuf *query)
{
/* GAS Query */
wpabuf_put_le16(buf, wpabuf_len(query));
wpabuf_put_buf(buf, query);
}
struct wpabuf * dpp_build_conf_req(struct dpp_authentication *auth,
const char *json)
{
struct wpabuf *buf, *conf_req;
conf_req = dpp_build_conf_req_attr(auth, json);
if (!conf_req) {
wpa_printf(MSG_DEBUG,
"DPP: No configuration request data available");
return NULL;
}
buf = gas_build_initial_req(0, 10 + 2 + wpabuf_len(conf_req));
if (!buf) {
wpabuf_free(conf_req);
return NULL;
}
dpp_write_adv_proto(buf);
dpp_write_gas_query(buf, conf_req);
wpabuf_free(conf_req);
wpa_hexdump_buf(MSG_MSGDUMP, "DPP: GAS Config Request", buf);
return buf;
}
struct wpabuf * dpp_build_conf_req_helper(struct dpp_authentication *auth,
const char *name, int netrole_ap,
const char *mud_url, int *opclasses)
{
size_t len, nlen;
const char *tech = "infra";
const char *dpp_name;
char *nbuf;
struct wpabuf *buf, *json;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_INVALID_CONFIG_ATTR_OBJ_CONF_REQ) {
static const char *bogus_tech = "knfra";
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Config Attr");
tech = bogus_tech;
}
#endif /* CONFIG_TESTING_OPTIONS */
dpp_name = name ? name : "Test";
len = os_strlen(dpp_name);
nlen = len * 6 + 1;
nbuf = os_malloc(nlen);
if (!nbuf)
return NULL;
json_escape_string(nbuf, nlen, dpp_name, len);
len = 100 + os_strlen(nbuf) + int_array_len(opclasses) * 4;
if (mud_url && mud_url[0])
len += 10 + os_strlen(mud_url);
json = wpabuf_alloc(len);
if (!json) {
os_free(nbuf);
return NULL;
}
wpabuf_printf(json,
"{\"name\":\"%s\","
"\"wi-fi_tech\":\"%s\","
"\"netRole\":\"%s\"",
nbuf, tech, netrole_ap ? "ap" : "sta");
if (mud_url && mud_url[0])
wpabuf_printf(json, ",\"mudurl\":\"%s\"", mud_url);
if (opclasses) {
int i;
wpabuf_put_str(json, ",\"bandSupport\":[");
for (i = 0; opclasses[i]; i++)
wpabuf_printf(json, "%s%u", i ? "," : "", opclasses[i]);
wpabuf_put_str(json, "]");
}
wpabuf_put_str(json, "}");
os_free(nbuf);
buf = dpp_build_conf_req(auth, wpabuf_head(json));
wpabuf_free(json);
return buf;
}
static void dpp_auth_success(struct dpp_authentication *auth)
{
wpa_printf(MSG_DEBUG,
"DPP: Authentication success - clear temporary keys");
os_memset(auth->Mx, 0, sizeof(auth->Mx));
auth->Mx_len = 0;
os_memset(auth->Nx, 0, sizeof(auth->Nx));
auth->Nx_len = 0;
os_memset(auth->Lx, 0, sizeof(auth->Lx));
auth->Lx_len = 0;
os_memset(auth->k1, 0, sizeof(auth->k1));
os_memset(auth->k2, 0, sizeof(auth->k2));
auth->auth_success = 1;
}
static int dpp_gen_r_auth(struct dpp_authentication *auth, u8 *r_auth)
{
struct wpabuf *pix, *prx, *bix, *brx;
const u8 *addr[7];
size_t len[7];
size_t i, num_elem = 0;
size_t nonce_len;
u8 zero = 0;
int res = -1;
/* R-auth = H(I-nonce | R-nonce | PI.x | PR.x | [BI.x |] BR.x | 0) */
nonce_len = auth->curve->nonce_len;
if (auth->initiator) {
pix = dpp_get_pubkey_point(auth->own_protocol_key, 0);
prx = dpp_get_pubkey_point(auth->peer_protocol_key, 0);
if (auth->own_bi)
bix = dpp_get_pubkey_point(auth->own_bi->pubkey, 0);
else
bix = NULL;
brx = dpp_get_pubkey_point(auth->peer_bi->pubkey, 0);
} else {
pix = dpp_get_pubkey_point(auth->peer_protocol_key, 0);
prx = dpp_get_pubkey_point(auth->own_protocol_key, 0);
if (auth->peer_bi)
bix = dpp_get_pubkey_point(auth->peer_bi->pubkey, 0);
else
bix = NULL;
brx = dpp_get_pubkey_point(auth->own_bi->pubkey, 0);
}
if (!pix || !prx || !brx)
goto fail;
addr[num_elem] = auth->i_nonce;
len[num_elem] = nonce_len;
num_elem++;
addr[num_elem] = auth->r_nonce;
len[num_elem] = nonce_len;
num_elem++;
addr[num_elem] = wpabuf_head(pix);
len[num_elem] = wpabuf_len(pix) / 2;
num_elem++;
addr[num_elem] = wpabuf_head(prx);
len[num_elem] = wpabuf_len(prx) / 2;
num_elem++;
if (bix) {
addr[num_elem] = wpabuf_head(bix);
len[num_elem] = wpabuf_len(bix) / 2;
num_elem++;
}
addr[num_elem] = wpabuf_head(brx);
len[num_elem] = wpabuf_len(brx) / 2;
num_elem++;
addr[num_elem] = &zero;
len[num_elem] = 1;
num_elem++;
wpa_printf(MSG_DEBUG, "DPP: R-auth hash components");
for (i = 0; i < num_elem; i++)
wpa_hexdump(MSG_DEBUG, "DPP: hash component", addr[i], len[i]);
res = dpp_hash_vector(auth->curve, num_elem, addr, len, r_auth);
if (res == 0)
wpa_hexdump(MSG_DEBUG, "DPP: R-auth", r_auth,
auth->curve->hash_len);
fail:
wpabuf_free(pix);
wpabuf_free(prx);
wpabuf_free(bix);
wpabuf_free(brx);
return res;
}
static int dpp_gen_i_auth(struct dpp_authentication *auth, u8 *i_auth)
{
struct wpabuf *pix = NULL, *prx = NULL, *bix = NULL, *brx = NULL;
const u8 *addr[7];
size_t len[7];
size_t i, num_elem = 0;
size_t nonce_len;
u8 one = 1;
int res = -1;
/* I-auth = H(R-nonce | I-nonce | PR.x | PI.x | BR.x | [BI.x |] 1) */
nonce_len = auth->curve->nonce_len;
if (auth->initiator) {
pix = dpp_get_pubkey_point(auth->own_protocol_key, 0);
prx = dpp_get_pubkey_point(auth->peer_protocol_key, 0);
if (auth->own_bi)
bix = dpp_get_pubkey_point(auth->own_bi->pubkey, 0);
else
bix = NULL;
if (!auth->peer_bi)
goto fail;
brx = dpp_get_pubkey_point(auth->peer_bi->pubkey, 0);
} else {
pix = dpp_get_pubkey_point(auth->peer_protocol_key, 0);
prx = dpp_get_pubkey_point(auth->own_protocol_key, 0);
if (auth->peer_bi)
bix = dpp_get_pubkey_point(auth->peer_bi->pubkey, 0);
else
bix = NULL;
if (!auth->own_bi)
goto fail;
brx = dpp_get_pubkey_point(auth->own_bi->pubkey, 0);
}
if (!pix || !prx || !brx)
goto fail;
addr[num_elem] = auth->r_nonce;
len[num_elem] = nonce_len;
num_elem++;
addr[num_elem] = auth->i_nonce;
len[num_elem] = nonce_len;
num_elem++;
addr[num_elem] = wpabuf_head(prx);
len[num_elem] = wpabuf_len(prx) / 2;
num_elem++;
addr[num_elem] = wpabuf_head(pix);
len[num_elem] = wpabuf_len(pix) / 2;
num_elem++;
addr[num_elem] = wpabuf_head(brx);
len[num_elem] = wpabuf_len(brx) / 2;
num_elem++;
if (bix) {
addr[num_elem] = wpabuf_head(bix);
len[num_elem] = wpabuf_len(bix) / 2;
num_elem++;
}
addr[num_elem] = &one;
len[num_elem] = 1;
num_elem++;
wpa_printf(MSG_DEBUG, "DPP: I-auth hash components");
for (i = 0; i < num_elem; i++)
wpa_hexdump(MSG_DEBUG, "DPP: hash component", addr[i], len[i]);
res = dpp_hash_vector(auth->curve, num_elem, addr, len, i_auth);
if (res == 0)
wpa_hexdump(MSG_DEBUG, "DPP: I-auth", i_auth,
auth->curve->hash_len);
fail:
wpabuf_free(pix);
wpabuf_free(prx);
wpabuf_free(bix);
wpabuf_free(brx);
return res;
}
static int dpp_auth_derive_l_responder(struct dpp_authentication *auth)
{
const EC_GROUP *group;
EC_POINT *l = NULL;
EC_KEY *BI = NULL, *bR = NULL, *pR = NULL;
const EC_POINT *BI_point;
BN_CTX *bnctx;
BIGNUM *lx, *sum, *q;
const BIGNUM *bR_bn, *pR_bn;
int ret = -1;
/* L = ((bR + pR) modulo q) * BI */
bnctx = BN_CTX_new();
sum = BN_new();
q = BN_new();
lx = BN_new();
if (!bnctx || !sum || !q || !lx)
goto fail;
BI = EVP_PKEY_get1_EC_KEY(auth->peer_bi->pubkey);
if (!BI)
goto fail;
BI_point = EC_KEY_get0_public_key(BI);
group = EC_KEY_get0_group(BI);
if (!group)
goto fail;
bR = EVP_PKEY_get1_EC_KEY(auth->own_bi->pubkey);
pR = EVP_PKEY_get1_EC_KEY(auth->own_protocol_key);
if (!bR || !pR)
goto fail;
bR_bn = EC_KEY_get0_private_key(bR);
pR_bn = EC_KEY_get0_private_key(pR);
if (!bR_bn || !pR_bn)
goto fail;
if (EC_GROUP_get_order(group, q, bnctx) != 1 ||
BN_mod_add(sum, bR_bn, pR_bn, q, bnctx) != 1)
goto fail;
l = EC_POINT_new(group);
if (!l ||
EC_POINT_mul(group, l, NULL, BI_point, sum, bnctx) != 1 ||
EC_POINT_get_affine_coordinates_GFp(group, l, lx, NULL,
bnctx) != 1) {
wpa_printf(MSG_ERROR,
"OpenSSL: failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
if (dpp_bn2bin_pad(lx, auth->Lx, auth->secret_len) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG, "DPP: L.x", auth->Lx, auth->secret_len);
auth->Lx_len = auth->secret_len;
ret = 0;
fail:
EC_POINT_clear_free(l);
EC_KEY_free(BI);
EC_KEY_free(bR);
EC_KEY_free(pR);
BN_clear_free(lx);
BN_clear_free(sum);
BN_free(q);
BN_CTX_free(bnctx);
return ret;
}
static int dpp_auth_derive_l_initiator(struct dpp_authentication *auth)
{
const EC_GROUP *group;
EC_POINT *l = NULL, *sum = NULL;
EC_KEY *bI = NULL, *BR = NULL, *PR = NULL;
const EC_POINT *BR_point, *PR_point;
BN_CTX *bnctx;
BIGNUM *lx;
const BIGNUM *bI_bn;
int ret = -1;
/* L = bI * (BR + PR) */
bnctx = BN_CTX_new();
lx = BN_new();
if (!bnctx || !lx)
goto fail;
BR = EVP_PKEY_get1_EC_KEY(auth->peer_bi->pubkey);
PR = EVP_PKEY_get1_EC_KEY(auth->peer_protocol_key);
if (!BR || !PR)
goto fail;
BR_point = EC_KEY_get0_public_key(BR);
PR_point = EC_KEY_get0_public_key(PR);
bI = EVP_PKEY_get1_EC_KEY(auth->own_bi->pubkey);
if (!bI)
goto fail;
group = EC_KEY_get0_group(bI);
bI_bn = EC_KEY_get0_private_key(bI);
if (!group || !bI_bn)
goto fail;
sum = EC_POINT_new(group);
l = EC_POINT_new(group);
if (!sum || !l ||
EC_POINT_add(group, sum, BR_point, PR_point, bnctx) != 1 ||
EC_POINT_mul(group, l, NULL, sum, bI_bn, bnctx) != 1 ||
EC_POINT_get_affine_coordinates_GFp(group, l, lx, NULL,
bnctx) != 1) {
wpa_printf(MSG_ERROR,
"OpenSSL: failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
if (dpp_bn2bin_pad(lx, auth->Lx, auth->secret_len) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG, "DPP: L.x", auth->Lx, auth->secret_len);
auth->Lx_len = auth->secret_len;
ret = 0;
fail:
EC_POINT_clear_free(l);
EC_POINT_clear_free(sum);
EC_KEY_free(bI);
EC_KEY_free(BR);
EC_KEY_free(PR);
BN_clear_free(lx);
BN_CTX_free(bnctx);
return ret;
}
static int dpp_auth_build_resp_ok(struct dpp_authentication *auth)
{
size_t nonce_len;
size_t secret_len;
struct wpabuf *msg, *pr = NULL;
u8 r_auth[4 + DPP_MAX_HASH_LEN];
u8 wrapped_r_auth[4 + DPP_MAX_HASH_LEN + AES_BLOCK_SIZE], *w_r_auth;
size_t wrapped_r_auth_len;
int ret = -1;
const u8 *r_pubkey_hash, *i_pubkey_hash, *r_nonce, *i_nonce;
enum dpp_status_error status = DPP_STATUS_OK;
#ifdef CONFIG_TESTING_OPTIONS
u8 test_hash[SHA256_MAC_LEN];
#endif /* CONFIG_TESTING_OPTIONS */
wpa_printf(MSG_DEBUG, "DPP: Build Authentication Response");
if (!auth->own_bi)
return -1;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_nonce_override_len > 0) {
wpa_printf(MSG_INFO, "DPP: TESTING - override R-nonce");
nonce_len = dpp_nonce_override_len;
os_memcpy(auth->r_nonce, dpp_nonce_override, nonce_len);
} else {
nonce_len = auth->curve->nonce_len;
if (random_get_bytes(auth->r_nonce, nonce_len)) {
wpa_printf(MSG_ERROR,
"DPP: Failed to generate R-nonce");
goto fail;
}
}
#else /* CONFIG_TESTING_OPTIONS */
nonce_len = auth->curve->nonce_len;
if (random_get_bytes(auth->r_nonce, nonce_len)) {
wpa_printf(MSG_ERROR, "DPP: Failed to generate R-nonce");
goto fail;
}
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump(MSG_DEBUG, "DPP: R-nonce", auth->r_nonce, nonce_len);
EVP_PKEY_free(auth->own_protocol_key);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_protocol_key_override_len) {
const struct dpp_curve_params *tmp_curve;
wpa_printf(MSG_INFO,
"DPP: TESTING - override protocol key");
auth->own_protocol_key = dpp_set_keypair(
&tmp_curve, dpp_protocol_key_override,
dpp_protocol_key_override_len);
} else {
auth->own_protocol_key = dpp_gen_keypair(auth->curve);
}
#else /* CONFIG_TESTING_OPTIONS */
auth->own_protocol_key = dpp_gen_keypair(auth->curve);
#endif /* CONFIG_TESTING_OPTIONS */
if (!auth->own_protocol_key)
goto fail;
pr = dpp_get_pubkey_point(auth->own_protocol_key, 0);
if (!pr)
goto fail;
/* ECDH: N = pR * PI */
if (dpp_ecdh(auth->own_protocol_key, auth->peer_protocol_key,
auth->Nx, &secret_len) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (N.x)",
auth->Nx, auth->secret_len);
auth->Nx_len = auth->secret_len;
if (dpp_derive_k2(auth->Nx, auth->secret_len, auth->k2,
auth->curve->hash_len) < 0)
goto fail;
if (auth->own_bi && auth->peer_bi) {
/* Mutual authentication */
if (dpp_auth_derive_l_responder(auth) < 0)
goto fail;
}
if (dpp_derive_ke(auth, auth->ke, auth->curve->hash_len) < 0)
goto fail;
/* R-auth = H(I-nonce | R-nonce | PI.x | PR.x | [BI.x |] BR.x | 0) */
WPA_PUT_LE16(r_auth, DPP_ATTR_R_AUTH_TAG);
WPA_PUT_LE16(&r_auth[2], auth->curve->hash_len);
if (dpp_gen_r_auth(auth, r_auth + 4) < 0)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_R_AUTH_MISMATCH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - R-auth mismatch");
r_auth[4 + auth->curve->hash_len / 2] ^= 0x01;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
r_auth, 4 + auth->curve->hash_len,
0, NULL, NULL, wrapped_r_auth) < 0)
goto fail;
wrapped_r_auth_len = 4 + auth->curve->hash_len + AES_BLOCK_SIZE;
wpa_hexdump(MSG_DEBUG, "DPP: {R-auth}ke",
wrapped_r_auth, wrapped_r_auth_len);
w_r_auth = wrapped_r_auth;
r_pubkey_hash = auth->own_bi->pubkey_hash;
if (auth->peer_bi)
i_pubkey_hash = auth->peer_bi->pubkey_hash;
else
i_pubkey_hash = NULL;
i_nonce = auth->i_nonce;
r_nonce = auth->r_nonce;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_R_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Bootstrap Key Hash");
r_pubkey_hash = NULL;
} else if (dpp_test ==
DPP_TEST_INVALID_R_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid R-Bootstrap Key Hash");
os_memcpy(test_hash, r_pubkey_hash, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
r_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_I_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-Bootstrap Key Hash");
i_pubkey_hash = NULL;
} else if (dpp_test ==
DPP_TEST_INVALID_I_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid I-Bootstrap Key Hash");
if (i_pubkey_hash)
os_memcpy(test_hash, i_pubkey_hash, SHA256_MAC_LEN);
else
os_memset(test_hash, 0, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
i_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_R_PROTO_KEY_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Proto Key");
wpabuf_free(pr);
pr = NULL;
} else if (dpp_test == DPP_TEST_INVALID_R_PROTO_KEY_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid R-Proto Key");
wpabuf_free(pr);
pr = wpabuf_alloc(2 * auth->curve->prime_len);
if (!pr || dpp_test_gen_invalid_key(pr, auth->curve) < 0)
goto fail;
} else if (dpp_test == DPP_TEST_NO_R_AUTH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Auth");
w_r_auth = NULL;
wrapped_r_auth_len = 0;
} else if (dpp_test == DPP_TEST_NO_STATUS_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Status");
status = 255;
} else if (dpp_test == DPP_TEST_INVALID_STATUS_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Status");
status = 254;
} else if (dpp_test == DPP_TEST_NO_R_NONCE_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-nonce");
r_nonce = NULL;
} else if (dpp_test == DPP_TEST_NO_I_NONCE_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-nonce");
i_nonce = NULL;
}
#endif /* CONFIG_TESTING_OPTIONS */
msg = dpp_auth_build_resp(auth, status, pr, nonce_len,
r_pubkey_hash, i_pubkey_hash,
r_nonce, i_nonce,
w_r_auth, wrapped_r_auth_len,
auth->k2);
if (!msg)
goto fail;
wpabuf_free(auth->resp_msg);
auth->resp_msg = msg;
ret = 0;
fail:
wpabuf_free(pr);
return ret;
}
static int dpp_auth_build_resp_status(struct dpp_authentication *auth,
enum dpp_status_error status)
{
struct wpabuf *msg;
const u8 *r_pubkey_hash, *i_pubkey_hash, *i_nonce;
#ifdef CONFIG_TESTING_OPTIONS
u8 test_hash[SHA256_MAC_LEN];
#endif /* CONFIG_TESTING_OPTIONS */
if (!auth->own_bi)
return -1;
wpa_printf(MSG_DEBUG, "DPP: Build Authentication Response");
r_pubkey_hash = auth->own_bi->pubkey_hash;
if (auth->peer_bi)
i_pubkey_hash = auth->peer_bi->pubkey_hash;
else
i_pubkey_hash = NULL;
i_nonce = auth->i_nonce;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_R_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Bootstrap Key Hash");
r_pubkey_hash = NULL;
} else if (dpp_test ==
DPP_TEST_INVALID_R_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid R-Bootstrap Key Hash");
os_memcpy(test_hash, r_pubkey_hash, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
r_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_I_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-Bootstrap Key Hash");
i_pubkey_hash = NULL;
} else if (dpp_test ==
DPP_TEST_INVALID_I_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid I-Bootstrap Key Hash");
if (i_pubkey_hash)
os_memcpy(test_hash, i_pubkey_hash, SHA256_MAC_LEN);
else
os_memset(test_hash, 0, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
i_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_STATUS_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Status");
status = 255;
} else if (dpp_test == DPP_TEST_NO_I_NONCE_AUTH_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-nonce");
i_nonce = NULL;
}
#endif /* CONFIG_TESTING_OPTIONS */
msg = dpp_auth_build_resp(auth, status, NULL, auth->curve->nonce_len,
r_pubkey_hash, i_pubkey_hash,
NULL, i_nonce, NULL, 0, auth->k1);
if (!msg)
return -1;
wpabuf_free(auth->resp_msg);
auth->resp_msg = msg;
return 0;
}
struct dpp_authentication *
dpp_auth_req_rx(void *msg_ctx, u8 dpp_allowed_roles, int qr_mutual,
struct dpp_bootstrap_info *peer_bi,
struct dpp_bootstrap_info *own_bi,
unsigned int freq, const u8 *hdr, const u8 *attr_start,
size_t attr_len)
{
EVP_PKEY *pi = NULL;
EVP_PKEY_CTX *ctx = NULL;
size_t secret_len;
const u8 *addr[2];
size_t len[2];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
const u8 *wrapped_data, *i_proto, *i_nonce, *i_capab, *i_bootstrap,
*channel;
u16 wrapped_data_len, i_proto_len, i_nonce_len, i_capab_len,
i_bootstrap_len, channel_len;
struct dpp_authentication *auth = NULL;
#ifdef CONFIG_DPP2
const u8 *version;
u16 version_len;
#endif /* CONFIG_DPP2 */
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_STOP_AT_AUTH_REQ) {
wpa_printf(MSG_INFO,
"DPP: TESTING - stop at Authentication Request");
return NULL;
}
#endif /* CONFIG_TESTING_OPTIONS */
wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
"Missing or invalid required Wrapped Data attribute");
return NULL;
}
wpa_hexdump(MSG_MSGDUMP, "DPP: Wrapped Data",
wrapped_data, wrapped_data_len);
attr_len = wrapped_data - 4 - attr_start;
auth = os_zalloc(sizeof(*auth));
if (!auth)
goto fail;
auth->msg_ctx = msg_ctx;
auth->peer_bi = peer_bi;
auth->own_bi = own_bi;
auth->curve = own_bi->curve;
auth->curr_freq = freq;
auth->peer_version = 1; /* default to the first version */
#ifdef CONFIG_DPP2
version = dpp_get_attr(attr_start, attr_len, DPP_ATTR_PROTOCOL_VERSION,
&version_len);
if (version) {
if (version_len < 1 || version[0] == 0) {
dpp_auth_fail(auth,
"Invalid Protocol Version attribute");
goto fail;
}
auth->peer_version = version[0];
wpa_printf(MSG_DEBUG, "DPP: Peer protocol version %u",
auth->peer_version);
}
#endif /* CONFIG_DPP2 */
channel = dpp_get_attr(attr_start, attr_len, DPP_ATTR_CHANNEL,
&channel_len);
if (channel) {
int neg_freq;
if (channel_len < 2) {
dpp_auth_fail(auth, "Too short Channel attribute");
goto fail;
}
neg_freq = ieee80211_chan_to_freq(NULL, channel[0], channel[1]);
wpa_printf(MSG_DEBUG,
"DPP: Initiator requested different channel for negotiation: op_class=%u channel=%u --> freq=%d",
channel[0], channel[1], neg_freq);
if (neg_freq < 0) {
dpp_auth_fail(auth,
"Unsupported Channel attribute value");
goto fail;
}
if (auth->curr_freq != (unsigned int) neg_freq) {
wpa_printf(MSG_DEBUG,
"DPP: Changing negotiation channel from %u MHz to %u MHz",
freq, neg_freq);
auth->curr_freq = neg_freq;
}
}
i_proto = dpp_get_attr(attr_start, attr_len, DPP_ATTR_I_PROTOCOL_KEY,
&i_proto_len);
if (!i_proto) {
dpp_auth_fail(auth,
"Missing required Initiator Protocol Key attribute");
goto fail;
}
wpa_hexdump(MSG_MSGDUMP, "DPP: Initiator Protocol Key",
i_proto, i_proto_len);
/* M = bR * PI */
pi = dpp_set_pubkey_point(own_bi->pubkey, i_proto, i_proto_len);
if (!pi) {
dpp_auth_fail(auth, "Invalid Initiator Protocol Key");
goto fail;
}
dpp_debug_print_key("Peer (Initiator) Protocol Key", pi);
if (dpp_ecdh(own_bi->pubkey, pi, auth->Mx, &secret_len) < 0)
goto fail;
auth->secret_len = secret_len;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (M.x)",
auth->Mx, auth->secret_len);
auth->Mx_len = auth->secret_len;
if (dpp_derive_k1(auth->Mx, auth->secret_len, auth->k1,
auth->curve->hash_len) < 0)
goto fail;
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
addr[1] = attr_start;
len[1] = attr_len;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
goto fail;
if (aes_siv_decrypt(auth->k1, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
i_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_NONCE,
&i_nonce_len);
if (!i_nonce || i_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth, "Missing or invalid I-nonce");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", i_nonce, i_nonce_len);
os_memcpy(auth->i_nonce, i_nonce, i_nonce_len);
i_capab = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_I_CAPABILITIES,
&i_capab_len);
if (!i_capab || i_capab_len < 1) {
dpp_auth_fail(auth, "Missing or invalid I-capabilities");
goto fail;
}
auth->i_capab = i_capab[0];
wpa_printf(MSG_DEBUG, "DPP: I-capabilities: 0x%02x", auth->i_capab);
bin_clear_free(unwrapped, unwrapped_len);
unwrapped = NULL;
switch (auth->i_capab & DPP_CAPAB_ROLE_MASK) {
case DPP_CAPAB_ENROLLEE:
if (!(dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR)) {
wpa_printf(MSG_DEBUG,
"DPP: Local policy does not allow Configurator role");
goto not_compatible;
}
wpa_printf(MSG_DEBUG, "DPP: Acting as Configurator");
auth->configurator = 1;
break;
case DPP_CAPAB_CONFIGURATOR:
if (!(dpp_allowed_roles & DPP_CAPAB_ENROLLEE)) {
wpa_printf(MSG_DEBUG,
"DPP: Local policy does not allow Enrollee role");
goto not_compatible;
}
wpa_printf(MSG_DEBUG, "DPP: Acting as Enrollee");
auth->configurator = 0;
break;
case DPP_CAPAB_CONFIGURATOR | DPP_CAPAB_ENROLLEE:
if (dpp_allowed_roles & DPP_CAPAB_ENROLLEE) {
wpa_printf(MSG_DEBUG, "DPP: Acting as Enrollee");
auth->configurator = 0;
} else if (dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR) {
wpa_printf(MSG_DEBUG, "DPP: Acting as Configurator");
auth->configurator = 1;
} else {
wpa_printf(MSG_DEBUG,
"DPP: Local policy does not allow Configurator/Enrollee role");
goto not_compatible;
}
break;
default:
wpa_printf(MSG_DEBUG, "DPP: Unexpected role in I-capabilities");
wpa_msg(auth->msg_ctx, MSG_INFO,
DPP_EVENT_FAIL "Invalid role in I-capabilities 0x%02x",
auth->i_capab & DPP_CAPAB_ROLE_MASK);
goto fail;
}
auth->peer_protocol_key = pi;
pi = NULL;
if (qr_mutual && !peer_bi && own_bi->type == DPP_BOOTSTRAP_QR_CODE) {
char hex[SHA256_MAC_LEN * 2 + 1];
wpa_printf(MSG_DEBUG,
"DPP: Mutual authentication required with QR Codes, but peer info is not yet available - request more time");
if (dpp_auth_build_resp_status(auth,
DPP_STATUS_RESPONSE_PENDING) < 0)
goto fail;
i_bootstrap = dpp_get_attr(attr_start, attr_len,
DPP_ATTR_I_BOOTSTRAP_KEY_HASH,
&i_bootstrap_len);
if (i_bootstrap && i_bootstrap_len == SHA256_MAC_LEN) {
auth->response_pending = 1;
os_memcpy(auth->waiting_pubkey_hash,
i_bootstrap, i_bootstrap_len);
wpa_snprintf_hex(hex, sizeof(hex), i_bootstrap,
i_bootstrap_len);
} else {
hex[0] = '\0';
}
wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_SCAN_PEER_QR_CODE
"%s", hex);
return auth;
}
if (dpp_auth_build_resp_ok(auth) < 0)
goto fail;
return auth;
not_compatible:
wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_NOT_COMPATIBLE
"i-capab=0x%02x", auth->i_capab);
if (dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR)
auth->configurator = 1;
else
auth->configurator = 0;
auth->peer_protocol_key = pi;
pi = NULL;
if (dpp_auth_build_resp_status(auth, DPP_STATUS_NOT_COMPATIBLE) < 0)
goto fail;
auth->remove_on_tx_status = 1;
return auth;
fail:
bin_clear_free(unwrapped, unwrapped_len);
EVP_PKEY_free(pi);
EVP_PKEY_CTX_free(ctx);
dpp_auth_deinit(auth);
return NULL;
}
int dpp_notify_new_qr_code(struct dpp_authentication *auth,
struct dpp_bootstrap_info *peer_bi)
{
if (!auth || !auth->response_pending ||
os_memcmp(auth->waiting_pubkey_hash, peer_bi->pubkey_hash,
SHA256_MAC_LEN) != 0)
return 0;
wpa_printf(MSG_DEBUG,
"DPP: New scanned QR Code has matching public key that was needed to continue DPP Authentication exchange with "
MACSTR, MAC2STR(auth->peer_mac_addr));
auth->peer_bi = peer_bi;
if (dpp_auth_build_resp_ok(auth) < 0)
return -1;
return 1;
}
static struct wpabuf * dpp_auth_build_conf(struct dpp_authentication *auth,
enum dpp_status_error status)
{
struct wpabuf *msg;
u8 i_auth[4 + DPP_MAX_HASH_LEN];
size_t i_auth_len;
u8 r_nonce[4 + DPP_MAX_NONCE_LEN];
size_t r_nonce_len;
const u8 *addr[2];
size_t len[2], attr_len;
u8 *wrapped_i_auth;
u8 *wrapped_r_nonce;
u8 *attr_start, *attr_end;
const u8 *r_pubkey_hash, *i_pubkey_hash;
#ifdef CONFIG_TESTING_OPTIONS
u8 test_hash[SHA256_MAC_LEN];
#endif /* CONFIG_TESTING_OPTIONS */
wpa_printf(MSG_DEBUG, "DPP: Build Authentication Confirmation");
i_auth_len = 4 + auth->curve->hash_len;
r_nonce_len = 4 + auth->curve->nonce_len;
/* Build DPP Authentication Confirmation frame attributes */
attr_len = 4 + 1 + 2 * (4 + SHA256_MAC_LEN) +
4 + i_auth_len + r_nonce_len + AES_BLOCK_SIZE;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_CONF)
attr_len += 5;
#endif /* CONFIG_TESTING_OPTIONS */
msg = dpp_alloc_msg(DPP_PA_AUTHENTICATION_CONF, attr_len);
if (!msg)
goto fail;
attr_start = wpabuf_put(msg, 0);
r_pubkey_hash = auth->peer_bi->pubkey_hash;
if (auth->own_bi)
i_pubkey_hash = auth->own_bi->pubkey_hash;
else
i_pubkey_hash = NULL;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_STATUS_AUTH_CONF) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Status");
goto skip_status;
} else if (dpp_test == DPP_TEST_INVALID_STATUS_AUTH_CONF) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Status");
status = 254;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* DPP Status */
dpp_build_attr_status(msg, status);
#ifdef CONFIG_TESTING_OPTIONS
skip_status:
if (dpp_test == DPP_TEST_NO_R_BOOTSTRAP_KEY_HASH_AUTH_CONF) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Bootstrap Key Hash");
r_pubkey_hash = NULL;
} else if (dpp_test ==
DPP_TEST_INVALID_R_BOOTSTRAP_KEY_HASH_AUTH_CONF) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid R-Bootstrap Key Hash");
os_memcpy(test_hash, r_pubkey_hash, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
r_pubkey_hash = test_hash;
} else if (dpp_test == DPP_TEST_NO_I_BOOTSTRAP_KEY_HASH_AUTH_CONF) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-Bootstrap Key Hash");
i_pubkey_hash = NULL;
} else if (dpp_test ==
DPP_TEST_INVALID_I_BOOTSTRAP_KEY_HASH_AUTH_CONF) {
wpa_printf(MSG_INFO,
"DPP: TESTING - invalid I-Bootstrap Key Hash");
if (i_pubkey_hash)
os_memcpy(test_hash, i_pubkey_hash, SHA256_MAC_LEN);
else
os_memset(test_hash, 0, SHA256_MAC_LEN);
test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
i_pubkey_hash = test_hash;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* Responder Bootstrapping Key Hash */
dpp_build_attr_r_bootstrap_key_hash(msg, r_pubkey_hash);
/* Initiator Bootstrapping Key Hash (mutual authentication) */
dpp_build_attr_i_bootstrap_key_hash(msg, i_pubkey_hash);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_AUTH_CONF)
goto skip_wrapped_data;
if (dpp_test == DPP_TEST_NO_I_AUTH_AUTH_CONF)
i_auth_len = 0;
#endif /* CONFIG_TESTING_OPTIONS */
attr_end = wpabuf_put(msg, 0);
/* OUI, OUI type, Crypto Suite, DPP frame type */
addr[0] = wpabuf_head_u8(msg) + 2;
len[0] = 3 + 1 + 1 + 1;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
/* Attributes before Wrapped Data */
addr[1] = attr_start;
len[1] = attr_end - attr_start;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
if (status == DPP_STATUS_OK) {
/* I-auth wrapped with ke */
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, i_auth_len + AES_BLOCK_SIZE);
wrapped_i_auth = wpabuf_put(msg, i_auth_len + AES_BLOCK_SIZE);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_I_AUTH_AUTH_CONF)
goto skip_i_auth;
#endif /* CONFIG_TESTING_OPTIONS */
/* I-auth = H(R-nonce | I-nonce | PR.x | PI.x | BR.x | [BI.x |]
* 1) */
WPA_PUT_LE16(i_auth, DPP_ATTR_I_AUTH_TAG);
WPA_PUT_LE16(&i_auth[2], auth->curve->hash_len);
if (dpp_gen_i_auth(auth, i_auth + 4) < 0)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_I_AUTH_MISMATCH_AUTH_CONF) {
wpa_printf(MSG_INFO, "DPP: TESTING - I-auth mismatch");
i_auth[4 + auth->curve->hash_len / 2] ^= 0x01;
}
skip_i_auth:
#endif /* CONFIG_TESTING_OPTIONS */
if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
i_auth, i_auth_len,
2, addr, len, wrapped_i_auth) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: {I-auth}ke",
wrapped_i_auth, i_auth_len + AES_BLOCK_SIZE);
} else {
/* R-nonce wrapped with k2 */
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, r_nonce_len + AES_BLOCK_SIZE);
wrapped_r_nonce = wpabuf_put(msg, r_nonce_len + AES_BLOCK_SIZE);
WPA_PUT_LE16(r_nonce, DPP_ATTR_R_NONCE);
WPA_PUT_LE16(&r_nonce[2], auth->curve->nonce_len);
os_memcpy(r_nonce + 4, auth->r_nonce, auth->curve->nonce_len);
if (aes_siv_encrypt(auth->k2, auth->curve->hash_len,
r_nonce, r_nonce_len,
2, addr, len, wrapped_r_nonce) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: {R-nonce}k2",
wrapped_r_nonce, r_nonce_len + AES_BLOCK_SIZE);
}
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_CONF) {
wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
dpp_build_attr_status(msg, DPP_STATUS_OK);
}
skip_wrapped_data:
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump_buf(MSG_DEBUG,
"DPP: Authentication Confirmation frame attributes",
msg);
if (status == DPP_STATUS_OK)
dpp_auth_success(auth);
return msg;
fail:
wpabuf_free(msg);
return NULL;
}
static void
dpp_auth_resp_rx_status(struct dpp_authentication *auth, const u8 *hdr,
const u8 *attr_start, size_t attr_len,
const u8 *wrapped_data, u16 wrapped_data_len,
enum dpp_status_error status)
{
const u8 *addr[2];
size_t len[2];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
const u8 *i_nonce, *r_capab;
u16 i_nonce_len, r_capab_len;
if (status == DPP_STATUS_NOT_COMPATIBLE) {
wpa_printf(MSG_DEBUG,
"DPP: Responder reported incompatible roles");
} else if (status == DPP_STATUS_RESPONSE_PENDING) {
wpa_printf(MSG_DEBUG,
"DPP: Responder reported more time needed");
} else {
wpa_printf(MSG_DEBUG,
"DPP: Responder reported failure (status %d)",
status);
dpp_auth_fail(auth, "Responder reported failure");
return;
}
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
addr[1] = attr_start;
len[1] = attr_len;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
goto fail;
if (aes_siv_decrypt(auth->k1, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
i_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_NONCE,
&i_nonce_len);
if (!i_nonce || i_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth, "Missing or invalid I-nonce");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", i_nonce, i_nonce_len);
if (os_memcmp(auth->i_nonce, i_nonce, i_nonce_len) != 0) {
dpp_auth_fail(auth, "I-nonce mismatch");
goto fail;
}
r_capab = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_R_CAPABILITIES,
&r_capab_len);
if (!r_capab || r_capab_len < 1) {
dpp_auth_fail(auth, "Missing or invalid R-capabilities");
goto fail;
}
auth->r_capab = r_capab[0];
wpa_printf(MSG_DEBUG, "DPP: R-capabilities: 0x%02x", auth->r_capab);
if (status == DPP_STATUS_NOT_COMPATIBLE) {
wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_NOT_COMPATIBLE
"r-capab=0x%02x", auth->r_capab);
} else if (status == DPP_STATUS_RESPONSE_PENDING) {
u8 role = auth->r_capab & DPP_CAPAB_ROLE_MASK;
if ((auth->configurator && role != DPP_CAPAB_ENROLLEE) ||
(!auth->configurator && role != DPP_CAPAB_CONFIGURATOR)) {
wpa_msg(auth->msg_ctx, MSG_INFO,
DPP_EVENT_FAIL "Unexpected role in R-capabilities 0x%02x",
role);
} else {
wpa_printf(MSG_DEBUG,
"DPP: Continue waiting for full DPP Authentication Response");
wpa_msg(auth->msg_ctx, MSG_INFO,
DPP_EVENT_RESPONSE_PENDING "%s",
auth->tmp_own_bi ? auth->tmp_own_bi->uri : "");
}
}
fail:
bin_clear_free(unwrapped, unwrapped_len);
}
struct wpabuf *
dpp_auth_resp_rx(struct dpp_authentication *auth, const u8 *hdr,
const u8 *attr_start, size_t attr_len)
{
EVP_PKEY *pr;
size_t secret_len;
const u8 *addr[2];
size_t len[2];
u8 *unwrapped = NULL, *unwrapped2 = NULL;
size_t unwrapped_len = 0, unwrapped2_len = 0;
const u8 *r_bootstrap, *i_bootstrap, *wrapped_data, *status, *r_proto,
*r_nonce, *i_nonce, *r_capab, *wrapped2, *r_auth;
u16 r_bootstrap_len, i_bootstrap_len, wrapped_data_len, status_len,
r_proto_len, r_nonce_len, i_nonce_len, r_capab_len,
wrapped2_len, r_auth_len;
u8 r_auth2[DPP_MAX_HASH_LEN];
u8 role;
#ifdef CONFIG_DPP2
const u8 *version;
u16 version_len;
#endif /* CONFIG_DPP2 */
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_STOP_AT_AUTH_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - stop at Authentication Response");
return NULL;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (!auth->initiator || !auth->peer_bi) {
dpp_auth_fail(auth, "Unexpected Authentication Response");
return NULL;
}
auth->waiting_auth_resp = 0;
wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
dpp_auth_fail(auth,
"Missing or invalid required Wrapped Data attribute");
return NULL;
}
wpa_hexdump(MSG_DEBUG, "DPP: Wrapped data",
wrapped_data, wrapped_data_len);
attr_len = wrapped_data - 4 - attr_start;
r_bootstrap = dpp_get_attr(attr_start, attr_len,
DPP_ATTR_R_BOOTSTRAP_KEY_HASH,
&r_bootstrap_len);
if (!r_bootstrap || r_bootstrap_len != SHA256_MAC_LEN) {
dpp_auth_fail(auth,
"Missing or invalid required Responder Bootstrapping Key Hash attribute");
return NULL;
}
wpa_hexdump(MSG_DEBUG, "DPP: Responder Bootstrapping Key Hash",
r_bootstrap, r_bootstrap_len);
if (os_memcmp(r_bootstrap, auth->peer_bi->pubkey_hash,
SHA256_MAC_LEN) != 0) {
dpp_auth_fail(auth,
"Unexpected Responder Bootstrapping Key Hash value");
wpa_hexdump(MSG_DEBUG,
"DPP: Expected Responder Bootstrapping Key Hash",
auth->peer_bi->pubkey_hash, SHA256_MAC_LEN);
return NULL;
}
i_bootstrap = dpp_get_attr(attr_start, attr_len,
DPP_ATTR_I_BOOTSTRAP_KEY_HASH,
&i_bootstrap_len);
if (i_bootstrap) {
if (i_bootstrap_len != SHA256_MAC_LEN) {
dpp_auth_fail(auth,
"Invalid Initiator Bootstrapping Key Hash attribute");
return NULL;
}
wpa_hexdump(MSG_MSGDUMP,
"DPP: Initiator Bootstrapping Key Hash",
i_bootstrap, i_bootstrap_len);
if (!auth->own_bi ||
os_memcmp(i_bootstrap, auth->own_bi->pubkey_hash,
SHA256_MAC_LEN) != 0) {
dpp_auth_fail(auth,
"Initiator Bootstrapping Key Hash attribute did not match");
return NULL;
}
} else if (auth->own_bi && auth->own_bi->type == DPP_BOOTSTRAP_PKEX) {
/* PKEX bootstrapping mandates use of mutual authentication */
dpp_auth_fail(auth,
"Missing Initiator Bootstrapping Key Hash attribute");
return NULL;
}
auth->peer_version = 1; /* default to the first version */
#ifdef CONFIG_DPP2
version = dpp_get_attr(attr_start, attr_len, DPP_ATTR_PROTOCOL_VERSION,
&version_len);
if (version) {
if (version_len < 1 || version[0] == 0) {
dpp_auth_fail(auth,
"Invalid Protocol Version attribute");
return NULL;
}
auth->peer_version = version[0];
wpa_printf(MSG_DEBUG, "DPP: Peer protocol version %u",
auth->peer_version);
}
#endif /* CONFIG_DPP2 */
status = dpp_get_attr(attr_start, attr_len, DPP_ATTR_STATUS,
&status_len);
if (!status || status_len < 1) {
dpp_auth_fail(auth,
"Missing or invalid required DPP Status attribute");
return NULL;
}
wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]);
auth->auth_resp_status = status[0];
if (status[0] != DPP_STATUS_OK) {
dpp_auth_resp_rx_status(auth, hdr, attr_start,
attr_len, wrapped_data,
wrapped_data_len, status[0]);
return NULL;
}
if (!i_bootstrap && auth->own_bi) {
wpa_printf(MSG_DEBUG,
"DPP: Responder decided not to use mutual authentication");
auth->own_bi = NULL;
}
wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_AUTH_DIRECTION "mutual=%d",
auth->own_bi != NULL);
r_proto = dpp_get_attr(attr_start, attr_len, DPP_ATTR_R_PROTOCOL_KEY,
&r_proto_len);
if (!r_proto) {
dpp_auth_fail(auth,
"Missing required Responder Protocol Key attribute");
return NULL;
}
wpa_hexdump(MSG_MSGDUMP, "DPP: Responder Protocol Key",
r_proto, r_proto_len);
/* N = pI * PR */
pr = dpp_set_pubkey_point(auth->own_protocol_key, r_proto, r_proto_len);
if (!pr) {
dpp_auth_fail(auth, "Invalid Responder Protocol Key");
return NULL;
}
dpp_debug_print_key("Peer (Responder) Protocol Key", pr);
if (dpp_ecdh(auth->own_protocol_key, pr, auth->Nx, &secret_len) < 0) {
dpp_auth_fail(auth, "Failed to derive ECDH shared secret");
goto fail;
}
EVP_PKEY_free(auth->peer_protocol_key);
auth->peer_protocol_key = pr;
pr = NULL;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (N.x)",
auth->Nx, auth->secret_len);
auth->Nx_len = auth->secret_len;
if (dpp_derive_k2(auth->Nx, auth->secret_len, auth->k2,
auth->curve->hash_len) < 0)
goto fail;
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
addr[1] = attr_start;
len[1] = attr_len;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
goto fail;
if (aes_siv_decrypt(auth->k2, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
r_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_R_NONCE,
&r_nonce_len);
if (!r_nonce || r_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth, "DPP: Missing or invalid R-nonce");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: R-nonce", r_nonce, r_nonce_len);
os_memcpy(auth->r_nonce, r_nonce, r_nonce_len);
i_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_NONCE,
&i_nonce_len);
if (!i_nonce || i_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth, "Missing or invalid I-nonce");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", i_nonce, i_nonce_len);
if (os_memcmp(auth->i_nonce, i_nonce, i_nonce_len) != 0) {
dpp_auth_fail(auth, "I-nonce mismatch");
goto fail;
}
if (auth->own_bi) {
/* Mutual authentication */
if (dpp_auth_derive_l_initiator(auth) < 0)
goto fail;
}
r_capab = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_R_CAPABILITIES,
&r_capab_len);
if (!r_capab || r_capab_len < 1) {
dpp_auth_fail(auth, "Missing or invalid R-capabilities");
goto fail;
}
auth->r_capab = r_capab[0];
wpa_printf(MSG_DEBUG, "DPP: R-capabilities: 0x%02x", auth->r_capab);
role = auth->r_capab & DPP_CAPAB_ROLE_MASK;
if ((auth->allowed_roles ==
(DPP_CAPAB_CONFIGURATOR | DPP_CAPAB_ENROLLEE)) &&
(role == DPP_CAPAB_CONFIGURATOR || role == DPP_CAPAB_ENROLLEE)) {
/* Peer selected its role, so move from "either role" to the
* role that is compatible with peer's selection. */
auth->configurator = role == DPP_CAPAB_ENROLLEE;
wpa_printf(MSG_DEBUG, "DPP: Acting as %s",
auth->configurator ? "Configurator" : "Enrollee");
} else if ((auth->configurator && role != DPP_CAPAB_ENROLLEE) ||
(!auth->configurator && role != DPP_CAPAB_CONFIGURATOR)) {
wpa_printf(MSG_DEBUG, "DPP: Incompatible role selection");
wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_FAIL
"Unexpected role in R-capabilities 0x%02x",
role);
if (role != DPP_CAPAB_ENROLLEE &&
role != DPP_CAPAB_CONFIGURATOR)
goto fail;
bin_clear_free(unwrapped, unwrapped_len);
auth->remove_on_tx_status = 1;
return dpp_auth_build_conf(auth, DPP_STATUS_NOT_COMPATIBLE);
}
wrapped2 = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_WRAPPED_DATA, &wrapped2_len);
if (!wrapped2 || wrapped2_len < AES_BLOCK_SIZE) {
dpp_auth_fail(auth,
"Missing or invalid Secondary Wrapped Data");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped2, wrapped2_len);
if (dpp_derive_ke(auth, auth->ke, auth->curve->hash_len) < 0)
goto fail;
unwrapped2_len = wrapped2_len - AES_BLOCK_SIZE;
unwrapped2 = os_malloc(unwrapped2_len);
if (!unwrapped2)
goto fail;
if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
wrapped2, wrapped2_len,
0, NULL, NULL, unwrapped2) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped2, unwrapped2_len);
if (dpp_check_attrs(unwrapped2, unwrapped2_len) < 0) {
dpp_auth_fail(auth,
"Invalid attribute in secondary unwrapped data");
goto fail;
}
r_auth = dpp_get_attr(unwrapped2, unwrapped2_len, DPP_ATTR_R_AUTH_TAG,
&r_auth_len);
if (!r_auth || r_auth_len != auth->curve->hash_len) {
dpp_auth_fail(auth,
"Missing or invalid Responder Authenticating Tag");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Received Responder Authenticating Tag",
r_auth, r_auth_len);
/* R-auth' = H(I-nonce | R-nonce | PI.x | PR.x | [BI.x |] BR.x | 0) */
if (dpp_gen_r_auth(auth, r_auth2) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: Calculated Responder Authenticating Tag",
r_auth2, r_auth_len);
if (os_memcmp(r_auth, r_auth2, r_auth_len) != 0) {
dpp_auth_fail(auth, "Mismatching Responder Authenticating Tag");
bin_clear_free(unwrapped, unwrapped_len);
bin_clear_free(unwrapped2, unwrapped2_len);
auth->remove_on_tx_status = 1;
return dpp_auth_build_conf(auth, DPP_STATUS_AUTH_FAILURE);
}
bin_clear_free(unwrapped, unwrapped_len);
bin_clear_free(unwrapped2, unwrapped2_len);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AUTH_RESP_IN_PLACE_OF_CONF) {
wpa_printf(MSG_INFO,
"DPP: TESTING - Authentication Response in place of Confirm");
if (dpp_auth_build_resp_ok(auth) < 0)
return NULL;
return wpabuf_dup(auth->resp_msg);
}
#endif /* CONFIG_TESTING_OPTIONS */
return dpp_auth_build_conf(auth, DPP_STATUS_OK);
fail:
bin_clear_free(unwrapped, unwrapped_len);
bin_clear_free(unwrapped2, unwrapped2_len);
EVP_PKEY_free(pr);
return NULL;
}
static int dpp_auth_conf_rx_failure(struct dpp_authentication *auth,
const u8 *hdr,
const u8 *attr_start, size_t attr_len,
const u8 *wrapped_data,
u16 wrapped_data_len,
enum dpp_status_error status)
{
const u8 *addr[2];
size_t len[2];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
const u8 *r_nonce;
u16 r_nonce_len;
/* Authentication Confirm failure cases are expected to include
* {R-nonce}k2 in the Wrapped Data attribute. */
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
addr[1] = attr_start;
len[1] = attr_len;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped) {
dpp_auth_fail(auth, "Authentication failed");
goto fail;
}
if (aes_siv_decrypt(auth->k2, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
r_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_R_NONCE,
&r_nonce_len);
if (!r_nonce || r_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth, "DPP: Missing or invalid R-nonce");
goto fail;
}
if (os_memcmp(r_nonce, auth->r_nonce, r_nonce_len) != 0) {
wpa_hexdump(MSG_DEBUG, "DPP: Received R-nonce",
r_nonce, r_nonce_len);
wpa_hexdump(MSG_DEBUG, "DPP: Expected R-nonce",
auth->r_nonce, r_nonce_len);
dpp_auth_fail(auth, "R-nonce mismatch");
goto fail;
}
if (status == DPP_STATUS_NOT_COMPATIBLE)
dpp_auth_fail(auth, "Peer reported incompatible R-capab role");
else if (status == DPP_STATUS_AUTH_FAILURE)
dpp_auth_fail(auth, "Peer reported authentication failure)");
fail:
bin_clear_free(unwrapped, unwrapped_len);
return -1;
}
int dpp_auth_conf_rx(struct dpp_authentication *auth, const u8 *hdr,
const u8 *attr_start, size_t attr_len)
{
const u8 *r_bootstrap, *i_bootstrap, *wrapped_data, *status, *i_auth;
u16 r_bootstrap_len, i_bootstrap_len, wrapped_data_len, status_len,
i_auth_len;
const u8 *addr[2];
size_t len[2];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
u8 i_auth2[DPP_MAX_HASH_LEN];
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_STOP_AT_AUTH_CONF) {
wpa_printf(MSG_INFO,
"DPP: TESTING - stop at Authentication Confirm");
return -1;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (auth->initiator || !auth->own_bi) {
dpp_auth_fail(auth, "Unexpected Authentication Confirm");
return -1;
}
auth->waiting_auth_conf = 0;
wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
dpp_auth_fail(auth,
"Missing or invalid required Wrapped Data attribute");
return -1;
}
wpa_hexdump(MSG_DEBUG, "DPP: Wrapped data",
wrapped_data, wrapped_data_len);
attr_len = wrapped_data - 4 - attr_start;
r_bootstrap = dpp_get_attr(attr_start, attr_len,
DPP_ATTR_R_BOOTSTRAP_KEY_HASH,
&r_bootstrap_len);
if (!r_bootstrap || r_bootstrap_len != SHA256_MAC_LEN) {
dpp_auth_fail(auth,
"Missing or invalid required Responder Bootstrapping Key Hash attribute");
return -1;
}
wpa_hexdump(MSG_DEBUG, "DPP: Responder Bootstrapping Key Hash",
r_bootstrap, r_bootstrap_len);
if (os_memcmp(r_bootstrap, auth->own_bi->pubkey_hash,
SHA256_MAC_LEN) != 0) {
wpa_hexdump(MSG_DEBUG,
"DPP: Expected Responder Bootstrapping Key Hash",
auth->peer_bi->pubkey_hash, SHA256_MAC_LEN);
dpp_auth_fail(auth,
"Responder Bootstrapping Key Hash mismatch");
return -1;
}
i_bootstrap = dpp_get_attr(attr_start, attr_len,
DPP_ATTR_I_BOOTSTRAP_KEY_HASH,
&i_bootstrap_len);
if (i_bootstrap) {
if (i_bootstrap_len != SHA256_MAC_LEN) {
dpp_auth_fail(auth,
"Invalid Initiator Bootstrapping Key Hash attribute");
return -1;
}
wpa_hexdump(MSG_MSGDUMP,
"DPP: Initiator Bootstrapping Key Hash",
i_bootstrap, i_bootstrap_len);
if (!auth->peer_bi ||
os_memcmp(i_bootstrap, auth->peer_bi->pubkey_hash,
SHA256_MAC_LEN) != 0) {
dpp_auth_fail(auth,
"Initiator Bootstrapping Key Hash mismatch");
return -1;
}
} else if (auth->peer_bi) {
/* Mutual authentication and peer did not include its
* Bootstrapping Key Hash attribute. */
dpp_auth_fail(auth,
"Missing Initiator Bootstrapping Key Hash attribute");
return -1;
}
status = dpp_get_attr(attr_start, attr_len, DPP_ATTR_STATUS,
&status_len);
if (!status || status_len < 1) {
dpp_auth_fail(auth,
"Missing or invalid required DPP Status attribute");
return -1;
}
wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]);
if (status[0] == DPP_STATUS_NOT_COMPATIBLE ||
status[0] == DPP_STATUS_AUTH_FAILURE)
return dpp_auth_conf_rx_failure(auth, hdr, attr_start,
attr_len, wrapped_data,
wrapped_data_len, status[0]);
if (status[0] != DPP_STATUS_OK) {
dpp_auth_fail(auth, "Authentication failed");
return -1;
}
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
addr[1] = attr_start;
len[1] = attr_len;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
return -1;
if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
i_auth = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_AUTH_TAG,
&i_auth_len);
if (!i_auth || i_auth_len != auth->curve->hash_len) {
dpp_auth_fail(auth,
"Missing or invalid Initiator Authenticating Tag");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Received Initiator Authenticating Tag",
i_auth, i_auth_len);
/* I-auth' = H(R-nonce | I-nonce | PR.x | PI.x | BR.x | [BI.x |] 1) */
if (dpp_gen_i_auth(auth, i_auth2) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: Calculated Initiator Authenticating Tag",
i_auth2, i_auth_len);
if (os_memcmp(i_auth, i_auth2, i_auth_len) != 0) {
dpp_auth_fail(auth, "Mismatching Initiator Authenticating Tag");
goto fail;
}
bin_clear_free(unwrapped, unwrapped_len);
dpp_auth_success(auth);
return 0;
fail:
bin_clear_free(unwrapped, unwrapped_len);
return -1;
}
static int bin_str_eq(const char *val, size_t len, const char *cmp)
{
return os_strlen(cmp) == len && os_memcmp(val, cmp, len) == 0;
}
struct dpp_configuration * dpp_configuration_alloc(const char *type)
{
struct dpp_configuration *conf;
const char *end;
size_t len;
conf = os_zalloc(sizeof(*conf));
if (!conf)
goto fail;
end = os_strchr(type, ' ');
if (end)
len = end - type;
else
len = os_strlen(type);
if (bin_str_eq(type, len, "psk"))
conf->akm = DPP_AKM_PSK;
else if (bin_str_eq(type, len, "sae"))
conf->akm = DPP_AKM_SAE;
else if (bin_str_eq(type, len, "psk-sae") ||
bin_str_eq(type, len, "psk+sae"))
conf->akm = DPP_AKM_PSK_SAE;
else if (bin_str_eq(type, len, "sae-dpp") ||
bin_str_eq(type, len, "dpp+sae"))
conf->akm = DPP_AKM_SAE_DPP;
else if (bin_str_eq(type, len, "psk-sae-dpp") ||
bin_str_eq(type, len, "dpp+psk+sae"))
conf->akm = DPP_AKM_PSK_SAE_DPP;
else if (bin_str_eq(type, len, "dpp"))
conf->akm = DPP_AKM_DPP;
else
goto fail;
return conf;
fail:
dpp_configuration_free(conf);
return NULL;
}
int dpp_akm_psk(enum dpp_akm akm)
{
return akm == DPP_AKM_PSK || akm == DPP_AKM_PSK_SAE ||
akm == DPP_AKM_PSK_SAE_DPP;
}
int dpp_akm_sae(enum dpp_akm akm)
{
return akm == DPP_AKM_SAE || akm == DPP_AKM_PSK_SAE ||
akm == DPP_AKM_SAE_DPP || akm == DPP_AKM_PSK_SAE_DPP;
}
int dpp_akm_legacy(enum dpp_akm akm)
{
return akm == DPP_AKM_PSK || akm == DPP_AKM_PSK_SAE ||
akm == DPP_AKM_SAE;
}
int dpp_akm_dpp(enum dpp_akm akm)
{
return akm == DPP_AKM_DPP || akm == DPP_AKM_SAE_DPP ||
akm == DPP_AKM_PSK_SAE_DPP;
}
int dpp_akm_ver2(enum dpp_akm akm)
{
return akm == DPP_AKM_SAE_DPP || akm == DPP_AKM_PSK_SAE_DPP;
}
int dpp_configuration_valid(const struct dpp_configuration *conf)
{
if (conf->ssid_len == 0)
return 0;
if (dpp_akm_psk(conf->akm) && !conf->passphrase && !conf->psk_set)
return 0;
if (dpp_akm_sae(conf->akm) && !conf->passphrase)
return 0;
return 1;
}
void dpp_configuration_free(struct dpp_configuration *conf)
{
if (!conf)
return;
str_clear_free(conf->passphrase);
os_free(conf->group_id);
bin_clear_free(conf, sizeof(*conf));
}
static int dpp_configuration_parse_helper(struct dpp_authentication *auth,
const char *cmd, int idx)
{
const char *pos, *end;
struct dpp_configuration *conf_sta = NULL, *conf_ap = NULL;
struct dpp_configuration *conf = NULL;
pos = os_strstr(cmd, " conf=sta-");
if (pos) {
conf_sta = dpp_configuration_alloc(pos + 10);
if (!conf_sta)
goto fail;
conf_sta->netrole = DPP_NETROLE_STA;
conf = conf_sta;
}
pos = os_strstr(cmd, " conf=ap-");
if (pos) {
conf_ap = dpp_configuration_alloc(pos + 9);
if (!conf_ap)
goto fail;
conf_ap->netrole = DPP_NETROLE_AP;
conf = conf_ap;
}
if (!conf)
return 0;
pos = os_strstr(cmd, " ssid=");
if (pos) {
pos += 6;
end = os_strchr(pos, ' ');
conf->ssid_len = end ? (size_t) (end - pos) : os_strlen(pos);
conf->ssid_len /= 2;
if (conf->ssid_len > sizeof(conf->ssid) ||
hexstr2bin(pos, conf->ssid, conf->ssid_len) < 0)
goto fail;
} else {
#ifdef CONFIG_TESTING_OPTIONS
/* use a default SSID for legacy testing reasons */
os_memcpy(conf->ssid, "test", 4);
conf->ssid_len = 4;
#else /* CONFIG_TESTING_OPTIONS */
goto fail;
#endif /* CONFIG_TESTING_OPTIONS */
}
pos = os_strstr(cmd, " pass=");
if (pos) {
size_t pass_len;
pos += 6;
end = os_strchr(pos, ' ');
pass_len = end ? (size_t) (end - pos) : os_strlen(pos);
pass_len /= 2;
if (pass_len > 63 || pass_len < 8)
goto fail;
conf->passphrase = os_zalloc(pass_len + 1);
if (!conf->passphrase ||
hexstr2bin(pos, (u8 *) conf->passphrase, pass_len) < 0)
goto fail;
}
pos = os_strstr(cmd, " psk=");
if (pos) {
pos += 5;
if (hexstr2bin(pos, conf->psk, PMK_LEN) < 0)
goto fail;
conf->psk_set = 1;
}
pos = os_strstr(cmd, " group_id=");
if (pos) {
size_t group_id_len;
pos += 10;
end = os_strchr(pos, ' ');
group_id_len = end ? (size_t) (end - pos) : os_strlen(pos);
conf->group_id = os_malloc(group_id_len + 1);
if (!conf->group_id)
goto fail;
os_memcpy(conf->group_id, pos, group_id_len);
conf->group_id[group_id_len] = '\0';
}
pos = os_strstr(cmd, " expiry=");
if (pos) {
long int val;
pos += 8;
val = strtol(pos, NULL, 0);
if (val <= 0)
goto fail;
conf->netaccesskey_expiry = val;
}
if (!dpp_configuration_valid(conf))
goto fail;
if (idx == 0) {
auth->conf_sta = conf_sta;
auth->conf_ap = conf_ap;
} else if (idx == 1) {
auth->conf2_sta = conf_sta;
auth->conf2_ap = conf_ap;
} else {
goto fail;
}
return 0;
fail:
dpp_configuration_free(conf_sta);
dpp_configuration_free(conf_ap);
return -1;
}
static int dpp_configuration_parse(struct dpp_authentication *auth,
const char *cmd)
{
const char *pos;
char *tmp;
size_t len;
int res;
pos = os_strstr(cmd, " @CONF-OBJ-SEP@ ");
if (!pos)
return dpp_configuration_parse_helper(auth, cmd, 0);
len = pos - cmd;
tmp = os_malloc(len + 1);
if (!tmp)
goto fail;
os_memcpy(tmp, cmd, len);
tmp[len] = '\0';
res = dpp_configuration_parse_helper(auth, cmd, 0);
str_clear_free(tmp);
if (res)
goto fail;
res = dpp_configuration_parse_helper(auth, cmd + len, 1);
if (res)
goto fail;
return 0;
fail:
dpp_configuration_free(auth->conf_sta);
dpp_configuration_free(auth->conf2_sta);
dpp_configuration_free(auth->conf_ap);
dpp_configuration_free(auth->conf2_ap);
return -1;
}
static struct dpp_configurator *
dpp_configurator_get_id(struct dpp_global *dpp, unsigned int id)
{
struct dpp_configurator *conf;
if (!dpp)
return NULL;
dl_list_for_each(conf, &dpp->configurator,
struct dpp_configurator, list) {
if (conf->id == id)
return conf;
}
return NULL;
}
int dpp_set_configurator(struct dpp_global *dpp, void *msg_ctx,
struct dpp_authentication *auth,
const char *cmd)
{
const char *pos;
if (!cmd)
return 0;
wpa_printf(MSG_DEBUG, "DPP: Set configurator parameters: %s", cmd);
pos = os_strstr(cmd, " configurator=");
if (pos) {
pos += 14;
auth->conf = dpp_configurator_get_id(dpp, atoi(pos));
if (!auth->conf) {
wpa_printf(MSG_INFO,
"DPP: Could not find the specified configurator");
return -1;
}
}
pos = os_strstr(cmd, " conn_status=");
if (pos) {
pos += 13;
auth->send_conn_status = atoi(pos);
}
pos = os_strstr(cmd, " akm_use_selector=");
if (pos) {
pos += 18;
auth->akm_use_selector = atoi(pos);
}
if (dpp_configuration_parse(auth, cmd) < 0) {
wpa_msg(msg_ctx, MSG_INFO,
"DPP: Failed to set configurator parameters");
return -1;
}
return 0;
}
void dpp_auth_deinit(struct dpp_authentication *auth)
{
unsigned int i;
if (!auth)
return;
dpp_configuration_free(auth->conf_ap);
dpp_configuration_free(auth->conf2_ap);
dpp_configuration_free(auth->conf_sta);
dpp_configuration_free(auth->conf2_sta);
EVP_PKEY_free(auth->own_protocol_key);
EVP_PKEY_free(auth->peer_protocol_key);
wpabuf_free(auth->req_msg);
wpabuf_free(auth->resp_msg);
wpabuf_free(auth->conf_req);
for (i = 0; i < auth->num_conf_obj; i++) {
struct dpp_config_obj *conf = &auth->conf_obj[i];
os_free(conf->connector);
wpabuf_free(conf->c_sign_key);
}
wpabuf_free(auth->net_access_key);
dpp_bootstrap_info_free(auth->tmp_own_bi);
#ifdef CONFIG_TESTING_OPTIONS
os_free(auth->config_obj_override);
os_free(auth->discovery_override);
os_free(auth->groups_override);
#endif /* CONFIG_TESTING_OPTIONS */
bin_clear_free(auth, sizeof(*auth));
}
static struct wpabuf *
dpp_build_conf_start(struct dpp_authentication *auth,
struct dpp_configuration *conf, size_t tailroom)
{
struct wpabuf *buf;
char ssid[6 * sizeof(conf->ssid) + 1];
#ifdef CONFIG_TESTING_OPTIONS
if (auth->discovery_override)
tailroom += os_strlen(auth->discovery_override);
#endif /* CONFIG_TESTING_OPTIONS */
buf = wpabuf_alloc(200 + tailroom);
if (!buf)
return NULL;
wpabuf_put_str(buf, "{\"wi-fi_tech\":\"infra\",\"discovery\":");
#ifdef CONFIG_TESTING_OPTIONS
if (auth->discovery_override) {
wpa_printf(MSG_DEBUG, "DPP: TESTING - discovery override: '%s'",
auth->discovery_override);
wpabuf_put_str(buf, auth->discovery_override);
wpabuf_put_u8(buf, ',');
return buf;
}
#endif /* CONFIG_TESTING_OPTIONS */
wpabuf_put_str(buf, "{\"ssid\":\"");
json_escape_string(ssid, sizeof(ssid),
(const char *) conf->ssid, conf->ssid_len);
wpabuf_put_str(buf, ssid);
wpabuf_put_str(buf, "\"},");
return buf;
}
static int dpp_build_jwk(struct wpabuf *buf, const char *name, EVP_PKEY *key,
const char *kid, const struct dpp_curve_params *curve)
{
struct wpabuf *pub;
const u8 *pos;
char *x = NULL, *y = NULL;
int ret = -1;
pub = dpp_get_pubkey_point(key, 0);
if (!pub)
goto fail;
pos = wpabuf_head(pub);
x = (char *) base64_url_encode(pos, curve->prime_len, NULL, 0);
pos += curve->prime_len;
y = (char *) base64_url_encode(pos, curve->prime_len, NULL, 0);
if (!x || !y)
goto fail;
wpabuf_put_str(buf, "\"");
wpabuf_put_str(buf, name);
wpabuf_put_str(buf, "\":{\"kty\":\"EC\",\"crv\":\"");
wpabuf_put_str(buf, curve->jwk_crv);
wpabuf_put_str(buf, "\",\"x\":\"");
wpabuf_put_str(buf, x);
wpabuf_put_str(buf, "\",\"y\":\"");
wpabuf_put_str(buf, y);
if (kid) {
wpabuf_put_str(buf, "\",\"kid\":\"");
wpabuf_put_str(buf, kid);
}
wpabuf_put_str(buf, "\"}");
ret = 0;
fail:
wpabuf_free(pub);
os_free(x);
os_free(y);
return ret;
}
static void dpp_build_legacy_cred_params(struct wpabuf *buf,
struct dpp_configuration *conf)
{
if (conf->passphrase && os_strlen(conf->passphrase) < 64) {
char pass[63 * 6 + 1];
json_escape_string(pass, sizeof(pass), conf->passphrase,
os_strlen(conf->passphrase));
wpabuf_put_str(buf, "\"pass\":\"");
wpabuf_put_str(buf, pass);
wpabuf_put_str(buf, "\"");
os_memset(pass, 0, sizeof(pass));
} else if (conf->psk_set) {
char psk[2 * sizeof(conf->psk) + 1];
wpa_snprintf_hex(psk, sizeof(psk),
conf->psk, sizeof(conf->psk));
wpabuf_put_str(buf, "\"psk_hex\":\"");
wpabuf_put_str(buf, psk);
wpabuf_put_str(buf, "\"");
os_memset(psk, 0, sizeof(psk));
}
}
static const char * dpp_netrole_str(enum dpp_netrole netrole)
{
switch (netrole) {
case DPP_NETROLE_STA:
return "sta";
case DPP_NETROLE_AP:
return "ap";
default:
return "??";
}
}
static struct wpabuf *
dpp_build_conf_obj_dpp(struct dpp_authentication *auth,
struct dpp_configuration *conf)
{
struct wpabuf *buf = NULL;
char *signed1 = NULL, *signed2 = NULL, *signed3 = NULL;
size_t tailroom;
const struct dpp_curve_params *curve;
char jws_prot_hdr[100];
size_t signed1_len, signed2_len, signed3_len;
struct wpabuf *dppcon = NULL;
unsigned char *signature = NULL;
const unsigned char *p;
size_t signature_len;
EVP_MD_CTX *md_ctx = NULL;
ECDSA_SIG *sig = NULL;
char *dot = ".";
const EVP_MD *sign_md;
const BIGNUM *r, *s;
size_t extra_len = 1000;
int incl_legacy;
enum dpp_akm akm;
const char *akm_str;
if (!auth->conf) {
wpa_printf(MSG_INFO,
"DPP: No configurator specified - cannot generate DPP config object");
goto fail;
}
curve = auth->conf->curve;
if (curve->hash_len == SHA256_MAC_LEN) {
sign_md = EVP_sha256();
} else if (curve->hash_len == SHA384_MAC_LEN) {
sign_md = EVP_sha384();
} else if (curve->hash_len == SHA512_MAC_LEN) {
sign_md = EVP_sha512();
} else {
wpa_printf(MSG_DEBUG, "DPP: Unknown signature algorithm");
goto fail;
}
akm = conf->akm;
if (dpp_akm_ver2(akm) && auth->peer_version < 2) {
wpa_printf(MSG_DEBUG,
"DPP: Convert DPP+legacy credential to DPP-only for peer that does not support version 2");
akm = DPP_AKM_DPP;
}
#ifdef CONFIG_TESTING_OPTIONS
if (auth->groups_override)
extra_len += os_strlen(auth->groups_override);
#endif /* CONFIG_TESTING_OPTIONS */
if (conf->group_id)
extra_len += os_strlen(conf->group_id);
/* Connector (JSON dppCon object) */
dppcon = wpabuf_alloc(extra_len + 2 * auth->curve->prime_len * 4 / 3);
if (!dppcon)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (auth->groups_override) {
wpabuf_put_u8(dppcon, '{');
if (auth->groups_override) {
wpa_printf(MSG_DEBUG,
"DPP: TESTING - groups override: '%s'",
auth->groups_override);
wpabuf_put_str(dppcon, "\"groups\":");
wpabuf_put_str(dppcon, auth->groups_override);
wpabuf_put_u8(dppcon, ',');
}
goto skip_groups;
}
#endif /* CONFIG_TESTING_OPTIONS */
wpabuf_printf(dppcon, "{\"groups\":[{\"groupId\":\"%s\",",
conf->group_id ? conf->group_id : "*");
wpabuf_printf(dppcon, "\"netRole\":\"%s\"}],",
dpp_netrole_str(conf->netrole));
#ifdef CONFIG_TESTING_OPTIONS
skip_groups:
#endif /* CONFIG_TESTING_OPTIONS */
if (dpp_build_jwk(dppcon, "netAccessKey", auth->peer_protocol_key, NULL,
auth->curve) < 0) {
wpa_printf(MSG_DEBUG, "DPP: Failed to build netAccessKey JWK");
goto fail;
}
if (conf->netaccesskey_expiry) {
struct os_tm tm;
if (os_gmtime(conf->netaccesskey_expiry, &tm) < 0) {
wpa_printf(MSG_DEBUG,
"DPP: Failed to generate expiry string");
goto fail;
}
wpabuf_printf(dppcon,
",\"expiry\":\"%04u-%02u-%02uT%02u:%02u:%02uZ\"",
tm.year, tm.month, tm.day,
tm.hour, tm.min, tm.sec);
}
wpabuf_put_u8(dppcon, '}');
wpa_printf(MSG_DEBUG, "DPP: dppCon: %s",
(const char *) wpabuf_head(dppcon));
os_snprintf(jws_prot_hdr, sizeof(jws_prot_hdr),
"{\"typ\":\"dppCon\",\"kid\":\"%s\",\"alg\":\"%s\"}",
auth->conf->kid, curve->jws_alg);
signed1 = (char *) base64_url_encode((unsigned char *) jws_prot_hdr,
os_strlen(jws_prot_hdr),
&signed1_len, 0);
signed2 = (char *) base64_url_encode(wpabuf_head(dppcon),
wpabuf_len(dppcon),
&signed2_len, 0);
if (!signed1 || !signed2)
goto fail;
md_ctx = EVP_MD_CTX_create();
if (!md_ctx)
goto fail;
ERR_clear_error();
if (EVP_DigestSignInit(md_ctx, NULL, sign_md, NULL,
auth->conf->csign) != 1) {
wpa_printf(MSG_DEBUG, "DPP: EVP_DigestSignInit failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
if (EVP_DigestSignUpdate(md_ctx, signed1, signed1_len) != 1 ||
EVP_DigestSignUpdate(md_ctx, dot, 1) != 1 ||
EVP_DigestSignUpdate(md_ctx, signed2, signed2_len) != 1) {
wpa_printf(MSG_DEBUG, "DPP: EVP_DigestSignUpdate failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
if (EVP_DigestSignFinal(md_ctx, NULL, &signature_len) != 1) {
wpa_printf(MSG_DEBUG, "DPP: EVP_DigestSignFinal failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
signature = os_malloc(signature_len);
if (!signature)
goto fail;
if (EVP_DigestSignFinal(md_ctx, signature, &signature_len) != 1) {
wpa_printf(MSG_DEBUG, "DPP: EVP_DigestSignFinal failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: signedConnector ECDSA signature (DER)",
signature, signature_len);
/* Convert to raw coordinates r,s */
p = signature;
sig = d2i_ECDSA_SIG(NULL, &p, signature_len);
if (!sig)
goto fail;
ECDSA_SIG_get0(sig, &r, &s);
if (dpp_bn2bin_pad(r, signature, curve->prime_len) < 0 ||
dpp_bn2bin_pad(s, signature + curve->prime_len,
curve->prime_len) < 0)
goto fail;
signature_len = 2 * curve->prime_len;
wpa_hexdump(MSG_DEBUG, "DPP: signedConnector ECDSA signature (raw r,s)",
signature, signature_len);
signed3 = (char *) base64_url_encode(signature, signature_len,
&signed3_len, 0);
if (!signed3)
goto fail;
incl_legacy = dpp_akm_psk(akm) || dpp_akm_sae(akm);
tailroom = 1000;
tailroom += 2 * curve->prime_len * 4 / 3 + os_strlen(auth->conf->kid);
tailroom += signed1_len + signed2_len + signed3_len;
if (incl_legacy)
tailroom += 1000;
buf = dpp_build_conf_start(auth, conf, tailroom);
if (!buf)
goto fail;
if (auth->akm_use_selector && dpp_akm_ver2(akm))
akm_str = dpp_akm_selector_str(akm);
else
akm_str = dpp_akm_str(akm);
wpabuf_printf(buf, "\"cred\":{\"akm\":\"%s\",", akm_str);
if (incl_legacy) {
dpp_build_legacy_cred_params(buf, conf);
wpabuf_put_str(buf, ",");
}
wpabuf_put_str(buf, "\"signedConnector\":\"");
wpabuf_put_str(buf, signed1);
wpabuf_put_u8(buf, '.');
wpabuf_put_str(buf, signed2);
wpabuf_put_u8(buf, '.');
wpabuf_put_str(buf, signed3);
wpabuf_put_str(buf, "\",");
if (dpp_build_jwk(buf, "csign", auth->conf->csign, auth->conf->kid,
curve) < 0) {
wpa_printf(MSG_DEBUG, "DPP: Failed to build csign JWK");
goto fail;
}
wpabuf_put_str(buf, "}}");
wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Configuration Object",
wpabuf_head(buf), wpabuf_len(buf));
out:
EVP_MD_CTX_destroy(md_ctx);
ECDSA_SIG_free(sig);
os_free(signed1);
os_free(signed2);
os_free(signed3);
os_free(signature);
wpabuf_free(dppcon);
return buf;
fail:
wpa_printf(MSG_DEBUG, "DPP: Failed to build configuration object");
wpabuf_free(buf);
buf = NULL;
goto out;
}
static struct wpabuf *
dpp_build_conf_obj_legacy(struct dpp_authentication *auth,
struct dpp_configuration *conf)
{
struct wpabuf *buf;
const char *akm_str;
buf = dpp_build_conf_start(auth, conf, 1000);
if (!buf)
return NULL;
if (auth->akm_use_selector && dpp_akm_ver2(conf->akm))
akm_str = dpp_akm_selector_str(conf->akm);
else
akm_str = dpp_akm_str(conf->akm);
wpabuf_printf(buf, "\"cred\":{\"akm\":\"%s\",", akm_str);
dpp_build_legacy_cred_params(buf, conf);
wpabuf_put_str(buf, "}}");
wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Configuration Object (legacy)",
wpabuf_head(buf), wpabuf_len(buf));
return buf;
}
static struct wpabuf *
dpp_build_conf_obj(struct dpp_authentication *auth, int ap, int idx)
{
struct dpp_configuration *conf;
#ifdef CONFIG_TESTING_OPTIONS
if (auth->config_obj_override) {
if (idx != 0)
return NULL;
wpa_printf(MSG_DEBUG, "DPP: Testing - Config Object override");
return wpabuf_alloc_copy(auth->config_obj_override,
os_strlen(auth->config_obj_override));
}
#endif /* CONFIG_TESTING_OPTIONS */
if (idx == 0)
conf = ap ? auth->conf_ap : auth->conf_sta;
else if (idx == 1)
conf = ap ? auth->conf2_ap : auth->conf2_sta;
else
conf = NULL;
if (!conf) {
if (idx == 0)
wpa_printf(MSG_DEBUG,
"DPP: No configuration available for Enrollee(%s) - reject configuration request",
ap ? "ap" : "sta");
return NULL;
}
if (dpp_akm_dpp(conf->akm))
return dpp_build_conf_obj_dpp(auth, conf);
return dpp_build_conf_obj_legacy(auth, conf);
}
static struct wpabuf *
dpp_build_conf_resp(struct dpp_authentication *auth, const u8 *e_nonce,
u16 e_nonce_len, int ap)
{
struct wpabuf *conf, *conf2 = NULL;
size_t clear_len, attr_len;
struct wpabuf *clear = NULL, *msg = NULL;
u8 *wrapped;
const u8 *addr[1];
size_t len[1];
enum dpp_status_error status;
conf = dpp_build_conf_obj(auth, ap, 0);
if (conf) {
wpa_hexdump_ascii(MSG_DEBUG, "DPP: configurationObject JSON",
wpabuf_head(conf), wpabuf_len(conf));
conf2 = dpp_build_conf_obj(auth, ap, 1);
}
status = conf ? DPP_STATUS_OK : DPP_STATUS_CONFIGURE_FAILURE;
auth->conf_resp_status = status;
/* { E-nonce, configurationObject[, sendConnStatus]}ke */
clear_len = 4 + e_nonce_len;
if (conf)
clear_len += 4 + wpabuf_len(conf);
if (conf2)
clear_len += 4 + wpabuf_len(conf2);
if (auth->peer_version >= 2 && auth->send_conn_status && !ap)
clear_len += 4;
clear = wpabuf_alloc(clear_len);
attr_len = 4 + 1 + 4 + clear_len + AES_BLOCK_SIZE;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_RESP)
attr_len += 5;
#endif /* CONFIG_TESTING_OPTIONS */
msg = wpabuf_alloc(attr_len);
if (!clear || !msg)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_E_NONCE_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no E-nonce");
goto skip_e_nonce;
}
if (dpp_test == DPP_TEST_E_NONCE_MISMATCH_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - E-nonce mismatch");
wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
wpabuf_put_le16(clear, e_nonce_len);
wpabuf_put_data(clear, e_nonce, e_nonce_len - 1);
wpabuf_put_u8(clear, e_nonce[e_nonce_len - 1] ^ 0x01);
goto skip_e_nonce;
}
if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
goto skip_wrapped_data;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* E-nonce */
wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
wpabuf_put_le16(clear, e_nonce_len);
wpabuf_put_data(clear, e_nonce, e_nonce_len);
#ifdef CONFIG_TESTING_OPTIONS
skip_e_nonce:
if (dpp_test == DPP_TEST_NO_CONFIG_OBJ_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - Config Object");
goto skip_config_obj;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (conf) {
wpabuf_put_le16(clear, DPP_ATTR_CONFIG_OBJ);
wpabuf_put_le16(clear, wpabuf_len(conf));
wpabuf_put_buf(clear, conf);
}
if (auth->peer_version >= 2 && conf2) {
wpabuf_put_le16(clear, DPP_ATTR_CONFIG_OBJ);
wpabuf_put_le16(clear, wpabuf_len(conf2));
wpabuf_put_buf(clear, conf2);
} else if (conf2) {
wpa_printf(MSG_DEBUG,
"DPP: Second Config Object available, but peer does not support more than one");
}
if (auth->peer_version >= 2 && auth->send_conn_status && !ap) {
wpa_printf(MSG_DEBUG, "DPP: sendConnStatus");
wpabuf_put_le16(clear, DPP_ATTR_SEND_CONN_STATUS);
wpabuf_put_le16(clear, 0);
}
#ifdef CONFIG_TESTING_OPTIONS
skip_config_obj:
if (dpp_test == DPP_TEST_NO_STATUS_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - Status");
goto skip_status;
}
if (dpp_test == DPP_TEST_INVALID_STATUS_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Status");
status = 255;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* DPP Status */
dpp_build_attr_status(msg, status);
#ifdef CONFIG_TESTING_OPTIONS
skip_status:
#endif /* CONFIG_TESTING_OPTIONS */
addr[0] = wpabuf_head(msg);
len[0] = wpabuf_len(msg);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]);
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
wpabuf_head(clear), wpabuf_len(clear),
1, addr, len, wrapped) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
dpp_build_attr_status(msg, DPP_STATUS_OK);
}
skip_wrapped_data:
#endif /* CONFIG_TESTING_OPTIONS */
wpa_hexdump_buf(MSG_DEBUG,
"DPP: Configuration Response attributes", msg);
out:
wpabuf_free(conf);
wpabuf_free(conf2);
wpabuf_free(clear);
return msg;
fail:
wpabuf_free(msg);
msg = NULL;
goto out;
}
struct wpabuf *
dpp_conf_req_rx(struct dpp_authentication *auth, const u8 *attr_start,
size_t attr_len)
{
const u8 *wrapped_data, *e_nonce, *config_attr;
u16 wrapped_data_len, e_nonce_len, config_attr_len;
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
struct wpabuf *resp = NULL;
struct json_token *root = NULL, *token;
int ap;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_STOP_AT_CONF_REQ) {
wpa_printf(MSG_INFO,
"DPP: TESTING - stop at Config Request");
return NULL;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (dpp_check_attrs(attr_start, attr_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in config request");
return NULL;
}
wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
dpp_auth_fail(auth,
"Missing or invalid required Wrapped Data attribute");
return NULL;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
return NULL;
if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
0, NULL, NULL, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
e_nonce = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_ENROLLEE_NONCE,
&e_nonce_len);
if (!e_nonce || e_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth,
"Missing or invalid Enrollee Nonce attribute");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len);
os_memcpy(auth->e_nonce, e_nonce, e_nonce_len);
config_attr = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_CONFIG_ATTR_OBJ,
&config_attr_len);
if (!config_attr) {
dpp_auth_fail(auth,
"Missing or invalid Config Attributes attribute");
goto fail;
}
wpa_hexdump_ascii(MSG_DEBUG, "DPP: Config Attributes",
config_attr, config_attr_len);
root = json_parse((const char *) config_attr, config_attr_len);
if (!root) {
dpp_auth_fail(auth, "Could not parse Config Attributes");
goto fail;
}
token = json_get_member(root, "name");
if (!token || token->type != JSON_STRING) {
dpp_auth_fail(auth, "No Config Attributes - name");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: Enrollee name = '%s'", token->string);
token = json_get_member(root, "wi-fi_tech");
if (!token || token->type != JSON_STRING) {
dpp_auth_fail(auth, "No Config Attributes - wi-fi_tech");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: wi-fi_tech = '%s'", token->string);
if (os_strcmp(token->string, "infra") != 0) {
wpa_printf(MSG_DEBUG, "DPP: Unsupported wi-fi_tech '%s'",
token->string);
dpp_auth_fail(auth, "Unsupported wi-fi_tech");
goto fail;
}
token = json_get_member(root, "netRole");
if (!token || token->type != JSON_STRING) {
dpp_auth_fail(auth, "No Config Attributes - netRole");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: netRole = '%s'", token->string);
if (os_strcmp(token->string, "sta") == 0) {
ap = 0;
} else if (os_strcmp(token->string, "ap") == 0) {
ap = 1;
} else {
wpa_printf(MSG_DEBUG, "DPP: Unsupported netRole '%s'",
token->string);
dpp_auth_fail(auth, "Unsupported netRole");
goto fail;
}
token = json_get_member(root, "mudurl");
if (token && token->type == JSON_STRING)
wpa_printf(MSG_DEBUG, "DPP: mudurl = '%s'", token->string);
token = json_get_member(root, "bandSupport");
if (token && token->type == JSON_ARRAY) {
wpa_printf(MSG_DEBUG, "DPP: bandSupport");
token = token->child;
while (token) {
if (token->type != JSON_NUMBER)
wpa_printf(MSG_DEBUG,
"DPP: Invalid bandSupport array member type");
else
wpa_printf(MSG_DEBUG,
"DPP: Supported global operating class: %d",
token->number);
token = token->sibling;
}
}
resp = dpp_build_conf_resp(auth, e_nonce, e_nonce_len, ap);
fail:
json_free(root);
os_free(unwrapped);
return resp;
}
static struct wpabuf *
dpp_parse_jws_prot_hdr(const struct dpp_curve_params *curve,
const u8 *prot_hdr, u16 prot_hdr_len,
const EVP_MD **ret_md)
{
struct json_token *root, *token;
struct wpabuf *kid = NULL;
root = json_parse((const char *) prot_hdr, prot_hdr_len);
if (!root) {
wpa_printf(MSG_DEBUG,
"DPP: JSON parsing failed for JWS Protected Header");
goto fail;
}
if (root->type != JSON_OBJECT) {
wpa_printf(MSG_DEBUG,
"DPP: JWS Protected Header root is not an object");
goto fail;
}
token = json_get_member(root, "typ");
if (!token || token->type != JSON_STRING) {
wpa_printf(MSG_DEBUG, "DPP: No typ string value found");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: JWS Protected Header typ=%s",
token->string);
if (os_strcmp(token->string, "dppCon") != 0) {
wpa_printf(MSG_DEBUG,
"DPP: Unsupported JWS Protected Header typ=%s",
token->string);
goto fail;
}
token = json_get_member(root, "alg");
if (!token || token->type != JSON_STRING) {
wpa_printf(MSG_DEBUG, "DPP: No alg string value found");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: JWS Protected Header alg=%s",
token->string);
if (os_strcmp(token->string, curve->jws_alg) != 0) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected JWS Protected Header alg=%s (expected %s based on C-sign-key)",
token->string, curve->jws_alg);
goto fail;
}
if (os_strcmp(token->string, "ES256") == 0 ||
os_strcmp(token->string, "BS256") == 0)
*ret_md = EVP_sha256();
else if (os_strcmp(token->string, "ES384") == 0 ||
os_strcmp(token->string, "BS384") == 0)
*ret_md = EVP_sha384();
else if (os_strcmp(token->string, "ES512") == 0 ||
os_strcmp(token->string, "BS512") == 0)
*ret_md = EVP_sha512();
else
*ret_md = NULL;
if (!*ret_md) {
wpa_printf(MSG_DEBUG,
"DPP: Unsupported JWS Protected Header alg=%s",
token->string);
goto fail;
}
kid = json_get_member_base64url(root, "kid");
if (!kid) {
wpa_printf(MSG_DEBUG, "DPP: No kid string value found");
goto fail;
}
wpa_hexdump_buf(MSG_DEBUG, "DPP: JWS Protected Header kid (decoded)",
kid);
fail:
json_free(root);
return kid;
}
static int dpp_parse_cred_legacy(struct dpp_config_obj *conf,
struct json_token *cred)
{
struct json_token *pass, *psk_hex;
wpa_printf(MSG_DEBUG, "DPP: Legacy akm=psk credential");
pass = json_get_member(cred, "pass");
psk_hex = json_get_member(cred, "psk_hex");
if (pass && pass->type == JSON_STRING) {
size_t len = os_strlen(pass->string);
wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Legacy passphrase",
pass->string, len);
if (len < 8 || len > 63)
return -1;
os_strlcpy(conf->passphrase, pass->string,
sizeof(conf->passphrase));
} else if (psk_hex && psk_hex->type == JSON_STRING) {
if (dpp_akm_sae(conf->akm) && !dpp_akm_psk(conf->akm)) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected psk_hex with akm=sae");
return -1;
}
if (os_strlen(psk_hex->string) != PMK_LEN * 2 ||
hexstr2bin(psk_hex->string, conf->psk, PMK_LEN) < 0) {
wpa_printf(MSG_DEBUG, "DPP: Invalid psk_hex encoding");
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "DPP: Legacy PSK",
conf->psk, PMK_LEN);
conf->psk_set = 1;
} else {
wpa_printf(MSG_DEBUG, "DPP: No pass or psk_hex strings found");
return -1;
}
if (dpp_akm_sae(conf->akm) && !conf->passphrase[0]) {
wpa_printf(MSG_DEBUG, "DPP: No pass for sae found");
return -1;
}
return 0;
}
static EVP_PKEY * dpp_parse_jwk(struct json_token *jwk,
const struct dpp_curve_params **key_curve)
{
struct json_token *token;
const struct dpp_curve_params *curve;
struct wpabuf *x = NULL, *y = NULL;
EC_GROUP *group;
EVP_PKEY *pkey = NULL;
token = json_get_member(jwk, "kty");
if (!token || token->type != JSON_STRING) {
wpa_printf(MSG_DEBUG, "DPP: No kty in JWK");
goto fail;
}
if (os_strcmp(token->string, "EC") != 0) {
wpa_printf(MSG_DEBUG, "DPP: Unexpected JWK kty '%s'",
token->string);
goto fail;
}
token = json_get_member(jwk, "crv");
if (!token || token->type != JSON_STRING) {
wpa_printf(MSG_DEBUG, "DPP: No crv in JWK");
goto fail;
}
curve = dpp_get_curve_jwk_crv(token->string);
if (!curve) {
wpa_printf(MSG_DEBUG, "DPP: Unsupported JWK crv '%s'",
token->string);
goto fail;
}
x = json_get_member_base64url(jwk, "x");
if (!x) {
wpa_printf(MSG_DEBUG, "DPP: No x in JWK");
goto fail;
}
wpa_hexdump_buf(MSG_DEBUG, "DPP: JWK x", x);
if (wpabuf_len(x) != curve->prime_len) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected JWK x length %u (expected %u for curve %s)",
(unsigned int) wpabuf_len(x),
(unsigned int) curve->prime_len, curve->name);
goto fail;
}
y = json_get_member_base64url(jwk, "y");
if (!y) {
wpa_printf(MSG_DEBUG, "DPP: No y in JWK");
goto fail;
}
wpa_hexdump_buf(MSG_DEBUG, "DPP: JWK y", y);
if (wpabuf_len(y) != curve->prime_len) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected JWK y length %u (expected %u for curve %s)",
(unsigned int) wpabuf_len(y),
(unsigned int) curve->prime_len, curve->name);
goto fail;
}
group = EC_GROUP_new_by_curve_name(OBJ_txt2nid(curve->name));
if (!group) {
wpa_printf(MSG_DEBUG, "DPP: Could not prepare group for JWK");
goto fail;
}
pkey = dpp_set_pubkey_point_group(group, wpabuf_head(x), wpabuf_head(y),
wpabuf_len(x));
EC_GROUP_free(group);
*key_curve = curve;
fail:
wpabuf_free(x);
wpabuf_free(y);
return pkey;
}
int dpp_key_expired(const char *timestamp, os_time_t *expiry)
{
struct os_time now;
unsigned int year, month, day, hour, min, sec;
os_time_t utime;
const char *pos;
/* ISO 8601 date and time:
* <date>T<time>
* YYYY-MM-DDTHH:MM:SSZ
* YYYY-MM-DDTHH:MM:SS+03:00
*/
if (os_strlen(timestamp) < 19) {
wpa_printf(MSG_DEBUG,
"DPP: Too short timestamp - assume expired key");
return 1;
}
if (sscanf(timestamp, "%04u-%02u-%02uT%02u:%02u:%02u",
&year, &month, &day, &hour, &min, &sec) != 6) {
wpa_printf(MSG_DEBUG,
"DPP: Failed to parse expiration day - assume expired key");
return 1;
}
if (os_mktime(year, month, day, hour, min, sec, &utime) < 0) {
wpa_printf(MSG_DEBUG,
"DPP: Invalid date/time information - assume expired key");
return 1;
}
pos = timestamp + 19;
if (*pos == 'Z' || *pos == '\0') {
/* In UTC - no need to adjust */
} else if (*pos == '-' || *pos == '+') {
int items;
/* Adjust local time to UTC */
items = sscanf(pos + 1, "%02u:%02u", &hour, &min);
if (items < 1) {
wpa_printf(MSG_DEBUG,
"DPP: Invalid time zone designator (%s) - assume expired key",
pos);
return 1;
}
if (*pos == '-')
utime += 3600 * hour;
if (*pos == '+')
utime -= 3600 * hour;
if (items > 1) {
if (*pos == '-')
utime += 60 * min;
if (*pos == '+')
utime -= 60 * min;
}
} else {
wpa_printf(MSG_DEBUG,
"DPP: Invalid time zone designator (%s) - assume expired key",
pos);
return 1;
}
if (expiry)
*expiry = utime;
if (os_get_time(&now) < 0) {
wpa_printf(MSG_DEBUG,
"DPP: Cannot get current time - assume expired key");
return 1;
}
if (now.sec > utime) {
wpa_printf(MSG_DEBUG, "DPP: Key has expired (%lu < %lu)",
utime, now.sec);
return 1;
}
return 0;
}
static int dpp_parse_connector(struct dpp_authentication *auth,
struct dpp_config_obj *conf,
const unsigned char *payload,
u16 payload_len)
{
struct json_token *root, *groups, *netkey, *token;
int ret = -1;
EVP_PKEY *key = NULL;
const struct dpp_curve_params *curve;
unsigned int rules = 0;
root = json_parse((const char *) payload, payload_len);
if (!root) {
wpa_printf(MSG_DEBUG, "DPP: JSON parsing of connector failed");
goto fail;
}
groups = json_get_member(root, "groups");
if (!groups || groups->type != JSON_ARRAY) {
wpa_printf(MSG_DEBUG, "DPP: No groups array found");
goto skip_groups;
}
for (token = groups->child; token; token = token->sibling) {
struct json_token *id, *role;
id = json_get_member(token, "groupId");
if (!id || id->type != JSON_STRING) {
wpa_printf(MSG_DEBUG, "DPP: Missing groupId string");
goto fail;
}
role = json_get_member(token, "netRole");
if (!role || role->type != JSON_STRING) {
wpa_printf(MSG_DEBUG, "DPP: Missing netRole string");
goto fail;
}
wpa_printf(MSG_DEBUG,
"DPP: connector group: groupId='%s' netRole='%s'",
id->string, role->string);
rules++;
}
skip_groups:
if (!rules) {
wpa_printf(MSG_DEBUG,
"DPP: Connector includes no groups");
goto fail;
}
token = json_get_member(root, "expiry");
if (!token || token->type != JSON_STRING) {
wpa_printf(MSG_DEBUG,
"DPP: No expiry string found - connector does not expire");
} else {
wpa_printf(MSG_DEBUG, "DPP: expiry = %s", token->string);
if (dpp_key_expired(token->string,
&auth->net_access_key_expiry)) {
wpa_printf(MSG_DEBUG,
"DPP: Connector (netAccessKey) has expired");
goto fail;
}
}
netkey = json_get_member(root, "netAccessKey");
if (!netkey || netkey->type != JSON_OBJECT) {
wpa_printf(MSG_DEBUG, "DPP: No netAccessKey object found");
goto fail;
}
key = dpp_parse_jwk(netkey, &curve);
if (!key)
goto fail;
dpp_debug_print_key("DPP: Received netAccessKey", key);
if (EVP_PKEY_cmp(key, auth->own_protocol_key) != 1) {
wpa_printf(MSG_DEBUG,
"DPP: netAccessKey in connector does not match own protocol key");
#ifdef CONFIG_TESTING_OPTIONS
if (auth->ignore_netaccesskey_mismatch) {
wpa_printf(MSG_DEBUG,
"DPP: TESTING - skip netAccessKey mismatch");
} else {
goto fail;
}
#else /* CONFIG_TESTING_OPTIONS */
goto fail;
#endif /* CONFIG_TESTING_OPTIONS */
}
ret = 0;
fail:
EVP_PKEY_free(key);
json_free(root);
return ret;
}
static int dpp_check_pubkey_match(EVP_PKEY *pub, struct wpabuf *r_hash)
{
struct wpabuf *uncomp;
int res;
u8 hash[SHA256_MAC_LEN];
const u8 *addr[1];
size_t len[1];
if (wpabuf_len(r_hash) != SHA256_MAC_LEN)
return -1;
uncomp = dpp_get_pubkey_point(pub, 1);
if (!uncomp)
return -1;
addr[0] = wpabuf_head(uncomp);
len[0] = wpabuf_len(uncomp);
wpa_hexdump(MSG_DEBUG, "DPP: Uncompressed public key",
addr[0], len[0]);
res = sha256_vector(1, addr, len, hash);
wpabuf_free(uncomp);
if (res < 0)
return -1;
if (os_memcmp(hash, wpabuf_head(r_hash), SHA256_MAC_LEN) != 0) {
wpa_printf(MSG_DEBUG,
"DPP: Received hash value does not match calculated public key hash value");
wpa_hexdump(MSG_DEBUG, "DPP: Calculated hash",
hash, SHA256_MAC_LEN);
return -1;
}
return 0;
}
static void dpp_copy_csign(struct dpp_config_obj *conf, EVP_PKEY *csign)
{
unsigned char *der = NULL;
int der_len;
der_len = i2d_PUBKEY(csign, &der);
if (der_len <= 0)
return;
wpabuf_free(conf->c_sign_key);
conf->c_sign_key = wpabuf_alloc_copy(der, der_len);
OPENSSL_free(der);
}
static void dpp_copy_netaccesskey(struct dpp_authentication *auth,
struct dpp_config_obj *conf)
{
unsigned char *der = NULL;
int der_len;
EC_KEY *eckey;
eckey = EVP_PKEY_get1_EC_KEY(auth->own_protocol_key);
if (!eckey)
return;
der_len = i2d_ECPrivateKey(eckey, &der);
if (der_len <= 0) {
EC_KEY_free(eckey);
return;
}
wpabuf_free(auth->net_access_key);
auth->net_access_key = wpabuf_alloc_copy(der, der_len);
OPENSSL_free(der);
EC_KEY_free(eckey);
}
struct dpp_signed_connector_info {
unsigned char *payload;
size_t payload_len;
};
static enum dpp_status_error
dpp_process_signed_connector(struct dpp_signed_connector_info *info,
EVP_PKEY *csign_pub, const char *connector)
{
enum dpp_status_error ret = 255;
const char *pos, *end, *signed_start, *signed_end;
struct wpabuf *kid = NULL;
unsigned char *prot_hdr = NULL, *signature = NULL;
size_t prot_hdr_len = 0, signature_len = 0;
const EVP_MD *sign_md = NULL;
unsigned char *der = NULL;
int der_len;
int res;
EVP_MD_CTX *md_ctx = NULL;
ECDSA_SIG *sig = NULL;
BIGNUM *r = NULL, *s = NULL;
const struct dpp_curve_params *curve;
EC_KEY *eckey;
const EC_GROUP *group;
int nid;
eckey = EVP_PKEY_get1_EC_KEY(csign_pub);
if (!eckey)
goto fail;
group = EC_KEY_get0_group(eckey);
if (!group)
goto fail;
nid = EC_GROUP_get_curve_name(group);
curve = dpp_get_curve_nid(nid);
if (!curve)
goto fail;
wpa_printf(MSG_DEBUG, "DPP: C-sign-key group: %s", curve->jwk_crv);
os_memset(info, 0, sizeof(*info));
signed_start = pos = connector;
end = os_strchr(pos, '.');
if (!end) {
wpa_printf(MSG_DEBUG, "DPP: Missing dot(1) in signedConnector");
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
prot_hdr = base64_url_decode((const unsigned char *) pos,
end - pos, &prot_hdr_len);
if (!prot_hdr) {
wpa_printf(MSG_DEBUG,
"DPP: Failed to base64url decode signedConnector JWS Protected Header");
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
wpa_hexdump_ascii(MSG_DEBUG,
"DPP: signedConnector - JWS Protected Header",
prot_hdr, prot_hdr_len);
kid = dpp_parse_jws_prot_hdr(curve, prot_hdr, prot_hdr_len, &sign_md);
if (!kid) {
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
if (wpabuf_len(kid) != SHA256_MAC_LEN) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected signedConnector JWS Protected Header kid length: %u (expected %u)",
(unsigned int) wpabuf_len(kid), SHA256_MAC_LEN);
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
pos = end + 1;
end = os_strchr(pos, '.');
if (!end) {
wpa_printf(MSG_DEBUG,
"DPP: Missing dot(2) in signedConnector");
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
signed_end = end - 1;
info->payload = base64_url_decode((const unsigned char *) pos,
end - pos, &info->payload_len);
if (!info->payload) {
wpa_printf(MSG_DEBUG,
"DPP: Failed to base64url decode signedConnector JWS Payload");
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
wpa_hexdump_ascii(MSG_DEBUG,
"DPP: signedConnector - JWS Payload",
info->payload, info->payload_len);
pos = end + 1;
signature = base64_url_decode((const unsigned char *) pos,
os_strlen(pos), &signature_len);
if (!signature) {
wpa_printf(MSG_DEBUG,
"DPP: Failed to base64url decode signedConnector signature");
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: signedConnector - signature",
signature, signature_len);
if (dpp_check_pubkey_match(csign_pub, kid) < 0) {
ret = DPP_STATUS_NO_MATCH;
goto fail;
}
if (signature_len & 0x01) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected signedConnector signature length (%d)",
(int) signature_len);
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
/* JWS Signature encodes the signature (r,s) as two octet strings. Need
* to convert that to DER encoded ECDSA_SIG for OpenSSL EVP routines. */
r = BN_bin2bn(signature, signature_len / 2, NULL);
s = BN_bin2bn(signature + signature_len / 2, signature_len / 2, NULL);
sig = ECDSA_SIG_new();
if (!r || !s || !sig || ECDSA_SIG_set0(sig, r, s) != 1)
goto fail;
r = NULL;
s = NULL;
der_len = i2d_ECDSA_SIG(sig, &der);
if (der_len <= 0) {
wpa_printf(MSG_DEBUG, "DPP: Could not DER encode signature");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: DER encoded signature", der, der_len);
md_ctx = EVP_MD_CTX_create();
if (!md_ctx)
goto fail;
ERR_clear_error();
if (EVP_DigestVerifyInit(md_ctx, NULL, sign_md, NULL, csign_pub) != 1) {
wpa_printf(MSG_DEBUG, "DPP: EVP_DigestVerifyInit failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
if (EVP_DigestVerifyUpdate(md_ctx, signed_start,
signed_end - signed_start + 1) != 1) {
wpa_printf(MSG_DEBUG, "DPP: EVP_DigestVerifyUpdate failed: %s",
ERR_error_string(ERR_get_error(), NULL));
goto fail;
}
res = EVP_DigestVerifyFinal(md_ctx, der, der_len);
if (res != 1) {
wpa_printf(MSG_DEBUG,
"DPP: EVP_DigestVerifyFinal failed (res=%d): %s",
res, ERR_error_string(ERR_get_error(), NULL));
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
ret = DPP_STATUS_OK;
fail:
EC_KEY_free(eckey);
EVP_MD_CTX_destroy(md_ctx);
os_free(prot_hdr);
wpabuf_free(kid);
os_free(signature);
ECDSA_SIG_free(sig);
BN_free(r);
BN_free(s);
OPENSSL_free(der);
return ret;
}
static int dpp_parse_cred_dpp(struct dpp_authentication *auth,
struct dpp_config_obj *conf,
struct json_token *cred)
{
struct dpp_signed_connector_info info;
struct json_token *token, *csign;
int ret = -1;
EVP_PKEY *csign_pub = NULL;
const struct dpp_curve_params *key_curve = NULL;
const char *signed_connector;
os_memset(&info, 0, sizeof(info));
if (dpp_akm_psk(conf->akm) || dpp_akm_sae(conf->akm)) {
wpa_printf(MSG_DEBUG,
"DPP: Legacy credential included in Connector credential");
if (dpp_parse_cred_legacy(conf, cred) < 0)
return -1;
}
wpa_printf(MSG_DEBUG, "DPP: Connector credential");
csign = json_get_member(cred, "csign");
if (!csign || csign->type != JSON_OBJECT) {
wpa_printf(MSG_DEBUG, "DPP: No csign JWK in JSON");
goto fail;
}
csign_pub = dpp_parse_jwk(csign, &key_curve);
if (!csign_pub) {
wpa_printf(MSG_DEBUG, "DPP: Failed to parse csign JWK");
goto fail;
}
dpp_debug_print_key("DPP: Received C-sign-key", csign_pub);
token = json_get_member(cred, "signedConnector");
if (!token || token->type != JSON_STRING) {
wpa_printf(MSG_DEBUG, "DPP: No signedConnector string found");
goto fail;
}
wpa_hexdump_ascii(MSG_DEBUG, "DPP: signedConnector",
token->string, os_strlen(token->string));
signed_connector = token->string;
if (os_strchr(signed_connector, '"') ||
os_strchr(signed_connector, '\n')) {
wpa_printf(MSG_DEBUG,
"DPP: Unexpected character in signedConnector");
goto fail;
}
if (dpp_process_signed_connector(&info, csign_pub,
signed_connector) != DPP_STATUS_OK)
goto fail;
if (dpp_parse_connector(auth, conf,
info.payload, info.payload_len) < 0) {
wpa_printf(MSG_DEBUG, "DPP: Failed to parse connector");
goto fail;
}
os_free(conf->connector);
conf->connector = os_strdup(signed_connector);
dpp_copy_csign(conf, csign_pub);
dpp_copy_netaccesskey(auth, conf);
ret = 0;
fail:
EVP_PKEY_free(csign_pub);
os_free(info.payload);
return ret;
}
const char * dpp_akm_str(enum dpp_akm akm)
{
switch (akm) {
case DPP_AKM_DPP:
return "dpp";
case DPP_AKM_PSK:
return "psk";
case DPP_AKM_SAE:
return "sae";
case DPP_AKM_PSK_SAE:
return "psk+sae";
case DPP_AKM_SAE_DPP:
return "dpp+sae";
case DPP_AKM_PSK_SAE_DPP:
return "dpp+psk+sae";
default:
return "??";
}
}
const char * dpp_akm_selector_str(enum dpp_akm akm)
{
switch (akm) {
case DPP_AKM_DPP:
return "506F9A02";
case DPP_AKM_PSK:
return "000FAC02+000FAC06";
case DPP_AKM_SAE:
return "000FAC08";
case DPP_AKM_PSK_SAE:
return "000FAC02+000FAC06+000FAC08";
case DPP_AKM_SAE_DPP:
return "506F9A02+000FAC08";
case DPP_AKM_PSK_SAE_DPP:
return "506F9A02+000FAC08+000FAC02+000FAC06";
default:
return "??";
}
}
static enum dpp_akm dpp_akm_from_str(const char *akm)
{
const char *pos;
int dpp = 0, psk = 0, sae = 0;
if (os_strcmp(akm, "psk") == 0)
return DPP_AKM_PSK;
if (os_strcmp(akm, "sae") == 0)
return DPP_AKM_SAE;
if (os_strcmp(akm, "psk+sae") == 0)
return DPP_AKM_PSK_SAE;
if (os_strcmp(akm, "dpp") == 0)
return DPP_AKM_DPP;
if (os_strcmp(akm, "dpp+sae") == 0)
return DPP_AKM_SAE_DPP;
if (os_strcmp(akm, "dpp+psk+sae") == 0)
return DPP_AKM_PSK_SAE_DPP;
pos = akm;
while (*pos) {
if (os_strlen(pos) < 8)
break;
if (os_strncasecmp(pos, "506F9A02", 8) == 0)
dpp = 1;
else if (os_strncasecmp(pos, "000FAC02", 8) == 0)
psk = 1;
else if (os_strncasecmp(pos, "000FAC06", 8) == 0)
psk = 1;
else if (os_strncasecmp(pos, "000FAC08", 8) == 0)
sae = 1;
pos += 8;
if (*pos != '+')
break;
pos++;
}
if (dpp && psk && sae)
return DPP_AKM_PSK_SAE_DPP;
if (dpp && sae)
return DPP_AKM_SAE_DPP;
if (dpp)
return DPP_AKM_DPP;
if (psk && sae)
return DPP_AKM_PSK_SAE;
if (sae)
return DPP_AKM_SAE;
if (psk)
return DPP_AKM_PSK;
return DPP_AKM_UNKNOWN;
}
static int dpp_parse_conf_obj(struct dpp_authentication *auth,
const u8 *conf_obj, u16 conf_obj_len)
{
int ret = -1;
struct json_token *root, *token, *discovery, *cred;
struct dpp_config_obj *conf;
root = json_parse((const char *) conf_obj, conf_obj_len);
if (!root)
return -1;
if (root->type != JSON_OBJECT) {
dpp_auth_fail(auth, "JSON root is not an object");
goto fail;
}
token = json_get_member(root, "wi-fi_tech");
if (!token || token->type != JSON_STRING) {
dpp_auth_fail(auth, "No wi-fi_tech string value found");
goto fail;
}
if (os_strcmp(token->string, "infra") != 0) {
wpa_printf(MSG_DEBUG, "DPP: Unsupported wi-fi_tech value: '%s'",
token->string);
dpp_auth_fail(auth, "Unsupported wi-fi_tech value");
goto fail;
}
discovery = json_get_member(root, "discovery");
if (!discovery || discovery->type != JSON_OBJECT) {
dpp_auth_fail(auth, "No discovery object in JSON");
goto fail;
}
token = json_get_member(discovery, "ssid");
if (!token || token->type != JSON_STRING) {
dpp_auth_fail(auth, "No discovery::ssid string value found");
goto fail;
}
wpa_hexdump_ascii(MSG_DEBUG, "DPP: discovery::ssid",
token->string, os_strlen(token->string));
if (os_strlen(token->string) > SSID_MAX_LEN) {
dpp_auth_fail(auth, "Too long discovery::ssid string value");
goto fail;
}
if (auth->num_conf_obj == DPP_MAX_CONF_OBJ) {
wpa_printf(MSG_DEBUG,
"DPP: No room for this many Config Objects - ignore this one");
json_free(root);
return 0;
}
conf = &auth->conf_obj[auth->num_conf_obj++];
conf->ssid_len = os_strlen(token->string);
os_memcpy(conf->ssid, token->string, conf->ssid_len);
cred = json_get_member(root, "cred");
if (!cred || cred->type != JSON_OBJECT) {
dpp_auth_fail(auth, "No cred object in JSON");
goto fail;
}
token = json_get_member(cred, "akm");
if (!token || token->type != JSON_STRING) {
dpp_auth_fail(auth, "No cred::akm string value found");
goto fail;
}
conf->akm = dpp_akm_from_str(token->string);
if (dpp_akm_legacy(conf->akm)) {
if (dpp_parse_cred_legacy(conf, cred) < 0)
goto fail;
} else if (dpp_akm_dpp(conf->akm)) {
if (dpp_parse_cred_dpp(auth, conf, cred) < 0)
goto fail;
} else {
wpa_printf(MSG_DEBUG, "DPP: Unsupported akm: %s",
token->string);
dpp_auth_fail(auth, "Unsupported akm");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: JSON parsing completed successfully");
ret = 0;
fail:
json_free(root);
return ret;
}
int dpp_conf_resp_rx(struct dpp_authentication *auth,
const struct wpabuf *resp)
{
const u8 *wrapped_data, *e_nonce, *status, *conf_obj;
u16 wrapped_data_len, e_nonce_len, status_len, conf_obj_len;
const u8 *addr[1];
size_t len[1];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
int ret = -1;
auth->conf_resp_status = 255;
if (dpp_check_attrs(wpabuf_head(resp), wpabuf_len(resp)) < 0) {
dpp_auth_fail(auth, "Invalid attribute in config response");
return -1;
}
wrapped_data = dpp_get_attr(wpabuf_head(resp), wpabuf_len(resp),
DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
dpp_auth_fail(auth,
"Missing or invalid required Wrapped Data attribute");
return -1;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
return -1;
addr[0] = wpabuf_head(resp);
len[0] = wrapped_data - 4 - (const u8 *) wpabuf_head(resp);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]);
if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
1, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
e_nonce = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_ENROLLEE_NONCE,
&e_nonce_len);
if (!e_nonce || e_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth,
"Missing or invalid Enrollee Nonce attribute");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len);
if (os_memcmp(e_nonce, auth->e_nonce, e_nonce_len) != 0) {
dpp_auth_fail(auth, "Enrollee Nonce mismatch");
goto fail;
}
status = dpp_get_attr(wpabuf_head(resp), wpabuf_len(resp),
DPP_ATTR_STATUS, &status_len);
if (!status || status_len < 1) {
dpp_auth_fail(auth,
"Missing or invalid required DPP Status attribute");
goto fail;
}
auth->conf_resp_status = status[0];
wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]);
if (status[0] != DPP_STATUS_OK) {
dpp_auth_fail(auth, "Configurator rejected configuration");
goto fail;
}
conf_obj = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_CONFIG_OBJ,
&conf_obj_len);
if (!conf_obj) {
dpp_auth_fail(auth,
"Missing required Configuration Object attribute");
goto fail;
}
while (conf_obj) {
wpa_hexdump_ascii(MSG_DEBUG, "DPP: configurationObject JSON",
conf_obj, conf_obj_len);
if (dpp_parse_conf_obj(auth, conf_obj, conf_obj_len) < 0)
goto fail;
conf_obj = dpp_get_attr_next(conf_obj, unwrapped, unwrapped_len,
DPP_ATTR_CONFIG_OBJ,
&conf_obj_len);
}
#ifdef CONFIG_DPP2
status = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_SEND_CONN_STATUS, &status_len);
if (status) {
wpa_printf(MSG_DEBUG,
"DPP: Configurator requested connection status result");
auth->conn_status_requested = 1;
}
#endif /* CONFIG_DPP2 */
ret = 0;
fail:
os_free(unwrapped);
return ret;
}
#ifdef CONFIG_DPP2
enum dpp_status_error dpp_conf_result_rx(struct dpp_authentication *auth,
const u8 *hdr,
const u8 *attr_start, size_t attr_len)
{
const u8 *wrapped_data, *status, *e_nonce;
u16 wrapped_data_len, status_len, e_nonce_len;
const u8 *addr[2];
size_t len[2];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
enum dpp_status_error ret = 256;
wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
dpp_auth_fail(auth,
"Missing or invalid required Wrapped Data attribute");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Wrapped data",
wrapped_data, wrapped_data_len);
attr_len = wrapped_data - 4 - attr_start;
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
addr[1] = attr_start;
len[1] = attr_len;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
goto fail;
if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
e_nonce = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_ENROLLEE_NONCE,
&e_nonce_len);
if (!e_nonce || e_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth,
"Missing or invalid Enrollee Nonce attribute");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len);
if (os_memcmp(e_nonce, auth->e_nonce, e_nonce_len) != 0) {
dpp_auth_fail(auth, "Enrollee Nonce mismatch");
wpa_hexdump(MSG_DEBUG, "DPP: Expected Enrollee Nonce",
auth->e_nonce, e_nonce_len);
goto fail;
}
status = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_STATUS,
&status_len);
if (!status || status_len < 1) {
dpp_auth_fail(auth,
"Missing or invalid required DPP Status attribute");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]);
ret = status[0];
fail:
bin_clear_free(unwrapped, unwrapped_len);
return ret;
}
struct wpabuf * dpp_build_conf_result(struct dpp_authentication *auth,
enum dpp_status_error status)
{
struct wpabuf *msg, *clear;
size_t nonce_len, clear_len, attr_len;
const u8 *addr[2];
size_t len[2];
u8 *wrapped;
nonce_len = auth->curve->nonce_len;
clear_len = 5 + 4 + nonce_len;
attr_len = 4 + clear_len + AES_BLOCK_SIZE;
clear = wpabuf_alloc(clear_len);
msg = dpp_alloc_msg(DPP_PA_CONFIGURATION_RESULT, attr_len);
if (!clear || !msg)
goto fail;
/* DPP Status */
dpp_build_attr_status(clear, status);
/* E-nonce */
wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
wpabuf_put_le16(clear, nonce_len);
wpabuf_put_data(clear, auth->e_nonce, nonce_len);
/* OUI, OUI type, Crypto Suite, DPP frame type */
addr[0] = wpabuf_head_u8(msg) + 2;
len[0] = 3 + 1 + 1 + 1;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
/* Attributes before Wrapped Data (none) */
addr[1] = wpabuf_put(msg, 0);
len[1] = 0;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
/* Wrapped Data */
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
wpabuf_head(clear), wpabuf_len(clear),
2, addr, len, wrapped) < 0)
goto fail;
wpa_hexdump_buf(MSG_DEBUG, "DPP: Configuration Result attributes", msg);
wpabuf_free(clear);
return msg;
fail:
wpabuf_free(clear);
wpabuf_free(msg);
return NULL;
}
static int valid_channel_list(const char *val)
{
while (*val) {
if (!((*val >= '0' && *val <= '9') ||
*val == '/' || *val == ','))
return 0;
val++;
}
return 1;
}
enum dpp_status_error dpp_conn_status_result_rx(struct dpp_authentication *auth,
const u8 *hdr,
const u8 *attr_start,
size_t attr_len,
u8 *ssid, size_t *ssid_len,
char **channel_list)
{
const u8 *wrapped_data, *status, *e_nonce;
u16 wrapped_data_len, status_len, e_nonce_len;
const u8 *addr[2];
size_t len[2];
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
enum dpp_status_error ret = 256;
struct json_token *root = NULL, *token;
struct wpabuf *ssid64;
*ssid_len = 0;
*channel_list = NULL;
wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
dpp_auth_fail(auth,
"Missing or invalid required Wrapped Data attribute");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Wrapped data",
wrapped_data, wrapped_data_len);
attr_len = wrapped_data - 4 - attr_start;
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
addr[1] = attr_start;
len[1] = attr_len;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
goto fail;
if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_auth_fail(auth, "AES-SIV decryption failed");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
goto fail;
}
e_nonce = dpp_get_attr(unwrapped, unwrapped_len,
DPP_ATTR_ENROLLEE_NONCE,
&e_nonce_len);
if (!e_nonce || e_nonce_len != auth->curve->nonce_len) {
dpp_auth_fail(auth,
"Missing or invalid Enrollee Nonce attribute");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len);
if (os_memcmp(e_nonce, auth->e_nonce, e_nonce_len) != 0) {
dpp_auth_fail(auth, "Enrollee Nonce mismatch");
wpa_hexdump(MSG_DEBUG, "DPP: Expected Enrollee Nonce",
auth->e_nonce, e_nonce_len);
goto fail;
}
status = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_CONN_STATUS,
&status_len);
if (!status) {
dpp_auth_fail(auth,
"Missing required DPP Connection Status attribute");
goto fail;
}
wpa_hexdump_ascii(MSG_DEBUG, "DPP: connStatus JSON",
status, status_len);
root = json_parse((const char *) status, status_len);
if (!root) {
dpp_auth_fail(auth, "Could not parse connStatus");
goto fail;
}
ssid64 = json_get_member_base64url(root, "ssid64");
if (ssid64 && wpabuf_len(ssid64) <= SSID_MAX_LEN) {
*ssid_len = wpabuf_len(ssid64);
os_memcpy(ssid, wpabuf_head(ssid64), *ssid_len);
}
wpabuf_free(ssid64);
token = json_get_member(root, "channelList");
if (token && token->type == JSON_STRING &&
valid_channel_list(token->string))
*channel_list = os_strdup(token->string);
token = json_get_member(root, "result");
if (!token || token->type != JSON_NUMBER) {
dpp_auth_fail(auth, "No connStatus - result");
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: result %d", token->number);
ret = token->number;
fail:
json_free(root);
bin_clear_free(unwrapped, unwrapped_len);
return ret;
}
struct wpabuf * dpp_build_conn_status_result(struct dpp_authentication *auth,
enum dpp_status_error result,
const u8 *ssid, size_t ssid_len,
const char *channel_list)
{
struct wpabuf *msg = NULL, *clear = NULL, *json;
size_t nonce_len, clear_len, attr_len;
const u8 *addr[2];
size_t len[2];
u8 *wrapped;
json = wpabuf_alloc(1000);
if (!json)
return NULL;
wpabuf_printf(json, "{\"result\":%d", result);
if (ssid) {
unsigned char *ssid64;
ssid64 = base64_url_encode(ssid, ssid_len, NULL, 0);
if (!ssid64)
goto fail;
wpabuf_put_str(json, ",\"ssid64\":\"");
wpabuf_put_str(json, (char *) ssid64);
os_free(ssid64);
wpabuf_put_str(json, "\"");
}
if (channel_list)
wpabuf_printf(json, ",\"channelList\":\"%s\"", channel_list);
wpabuf_put_str(json, "}");
wpa_hexdump_ascii(MSG_DEBUG, "DPP: connStatus JSON",
wpabuf_head(json), wpabuf_len(json));
nonce_len = auth->curve->nonce_len;
clear_len = 5 + 4 + nonce_len + 4 + wpabuf_len(json);
attr_len = 4 + clear_len + AES_BLOCK_SIZE;
clear = wpabuf_alloc(clear_len);
msg = dpp_alloc_msg(DPP_PA_CONNECTION_STATUS_RESULT, attr_len);
if (!clear || !msg)
goto fail;
/* E-nonce */
wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
wpabuf_put_le16(clear, nonce_len);
wpabuf_put_data(clear, auth->e_nonce, nonce_len);
/* DPP Connection Status */
wpabuf_put_le16(clear, DPP_ATTR_CONN_STATUS);
wpabuf_put_le16(clear, wpabuf_len(json));
wpabuf_put_buf(clear, json);
/* OUI, OUI type, Crypto Suite, DPP frame type */
addr[0] = wpabuf_head_u8(msg) + 2;
len[0] = 3 + 1 + 1 + 1;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
/* Attributes before Wrapped Data (none) */
addr[1] = wpabuf_put(msg, 0);
len[1] = 0;
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
/* Wrapped Data */
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
wpabuf_head(clear), wpabuf_len(clear),
2, addr, len, wrapped) < 0)
goto fail;
wpa_hexdump_buf(MSG_DEBUG, "DPP: Connection Status Result attributes",
msg);
wpabuf_free(json);
wpabuf_free(clear);
return msg;
fail:
wpabuf_free(json);
wpabuf_free(clear);
wpabuf_free(msg);
return NULL;
}
#endif /* CONFIG_DPP2 */
void dpp_configurator_free(struct dpp_configurator *conf)
{
if (!conf)
return;
EVP_PKEY_free(conf->csign);
os_free(conf->kid);
os_free(conf);
}
int dpp_configurator_get_key(const struct dpp_configurator *conf, char *buf,
size_t buflen)
{
EC_KEY *eckey;
int key_len, ret = -1;
unsigned char *key = NULL;
if (!conf->csign)
return -1;
eckey = EVP_PKEY_get1_EC_KEY(conf->csign);
if (!eckey)
return -1;
key_len = i2d_ECPrivateKey(eckey, &key);
if (key_len > 0)
ret = wpa_snprintf_hex(buf, buflen, key, key_len);
EC_KEY_free(eckey);
OPENSSL_free(key);
return ret;
}
struct dpp_configurator *
dpp_keygen_configurator(const char *curve, const u8 *privkey,
size_t privkey_len)
{
struct dpp_configurator *conf;
struct wpabuf *csign_pub = NULL;
u8 kid_hash[SHA256_MAC_LEN];
const u8 *addr[1];
size_t len[1];
conf = os_zalloc(sizeof(*conf));
if (!conf)
return NULL;
if (!curve) {
conf->curve = &dpp_curves[0];
} else {
conf->curve = dpp_get_curve_name(curve);
if (!conf->curve) {
wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s",
curve);
os_free(conf);
return NULL;
}
}
if (privkey)
conf->csign = dpp_set_keypair(&conf->curve, privkey,
privkey_len);
else
conf->csign = dpp_gen_keypair(conf->curve);
if (!conf->csign)
goto fail;
conf->own = 1;
csign_pub = dpp_get_pubkey_point(conf->csign, 1);
if (!csign_pub) {
wpa_printf(MSG_INFO, "DPP: Failed to extract C-sign-key");
goto fail;
}
/* kid = SHA256(ANSI X9.63 uncompressed C-sign-key) */
addr[0] = wpabuf_head(csign_pub);
len[0] = wpabuf_len(csign_pub);
if (sha256_vector(1, addr, len, kid_hash) < 0) {
wpa_printf(MSG_DEBUG,
"DPP: Failed to derive kid for C-sign-key");
goto fail;
}
conf->kid = (char *) base64_url_encode(kid_hash, sizeof(kid_hash),
NULL, 0);
if (!conf->kid)
goto fail;
out:
wpabuf_free(csign_pub);
return conf;
fail:
dpp_configurator_free(conf);
conf = NULL;
goto out;
}
int dpp_configurator_own_config(struct dpp_authentication *auth,
const char *curve, int ap)
{
struct wpabuf *conf_obj;
int ret = -1;
if (!auth->conf) {
wpa_printf(MSG_DEBUG, "DPP: No configurator specified");
return -1;
}
if (!curve) {
auth->curve = &dpp_curves[0];
} else {
auth->curve = dpp_get_curve_name(curve);
if (!auth->curve) {
wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s",
curve);
return -1;
}
}
wpa_printf(MSG_DEBUG,
"DPP: Building own configuration/connector with curve %s",
auth->curve->name);
auth->own_protocol_key = dpp_gen_keypair(auth->curve);
if (!auth->own_protocol_key)
return -1;
dpp_copy_netaccesskey(auth, &auth->conf_obj[0]);
auth->peer_protocol_key = auth->own_protocol_key;
dpp_copy_csign(&auth->conf_obj[0], auth->conf->csign);
conf_obj = dpp_build_conf_obj(auth, ap, 0);
if (!conf_obj)
goto fail;
ret = dpp_parse_conf_obj(auth, wpabuf_head(conf_obj),
wpabuf_len(conf_obj));
fail:
wpabuf_free(conf_obj);
auth->peer_protocol_key = NULL;
return ret;
}
static int dpp_compatible_netrole(const char *role1, const char *role2)
{
return (os_strcmp(role1, "sta") == 0 && os_strcmp(role2, "ap") == 0) ||
(os_strcmp(role1, "ap") == 0 && os_strcmp(role2, "sta") == 0);
}
static int dpp_connector_compatible_group(struct json_token *root,
const char *group_id,
const char *net_role)
{
struct json_token *groups, *token;
groups = json_get_member(root, "groups");
if (!groups || groups->type != JSON_ARRAY)
return 0;
for (token = groups->child; token; token = token->sibling) {
struct json_token *id, *role;
id = json_get_member(token, "groupId");
if (!id || id->type != JSON_STRING)
continue;
role = json_get_member(token, "netRole");
if (!role || role->type != JSON_STRING)
continue;
if (os_strcmp(id->string, "*") != 0 &&
os_strcmp(group_id, "*") != 0 &&
os_strcmp(id->string, group_id) != 0)
continue;
if (dpp_compatible_netrole(role->string, net_role))
return 1;
}
return 0;
}
static int dpp_connector_match_groups(struct json_token *own_root,
struct json_token *peer_root)
{
struct json_token *groups, *token;
groups = json_get_member(peer_root, "groups");
if (!groups || groups->type != JSON_ARRAY) {
wpa_printf(MSG_DEBUG, "DPP: No peer groups array found");
return 0;
}
for (token = groups->child; token; token = token->sibling) {
struct json_token *id, *role;
id = json_get_member(token, "groupId");
if (!id || id->type != JSON_STRING) {
wpa_printf(MSG_DEBUG,
"DPP: Missing peer groupId string");
continue;
}
role = json_get_member(token, "netRole");
if (!role || role->type != JSON_STRING) {
wpa_printf(MSG_DEBUG,
"DPP: Missing peer groups::netRole string");
continue;
}
wpa_printf(MSG_DEBUG,
"DPP: peer connector group: groupId='%s' netRole='%s'",
id->string, role->string);
if (dpp_connector_compatible_group(own_root, id->string,
role->string)) {
wpa_printf(MSG_DEBUG,
"DPP: Compatible group/netRole in own connector");
return 1;
}
}
return 0;
}
static int dpp_derive_pmk(const u8 *Nx, size_t Nx_len, u8 *pmk,
unsigned int hash_len)
{
u8 salt[DPP_MAX_HASH_LEN], prk[DPP_MAX_HASH_LEN];
const char *info = "DPP PMK";
int res;
/* PMK = HKDF(<>, "DPP PMK", N.x) */
/* HKDF-Extract(<>, N.x) */
os_memset(salt, 0, hash_len);
if (dpp_hmac(hash_len, salt, hash_len, Nx, Nx_len, prk) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM=N.x)",
prk, hash_len);
/* HKDF-Expand(PRK, info, L) */
res = dpp_hkdf_expand(hash_len, prk, hash_len, info, pmk, hash_len);
os_memset(prk, 0, hash_len);
if (res < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "DPP: PMK = HKDF-Expand(PRK, info, L)",
pmk, hash_len);
return 0;
}
static int dpp_derive_pmkid(const struct dpp_curve_params *curve,
EVP_PKEY *own_key, EVP_PKEY *peer_key, u8 *pmkid)
{
struct wpabuf *nkx, *pkx;
int ret = -1, res;
const u8 *addr[2];
size_t len[2];
u8 hash[SHA256_MAC_LEN];
/* PMKID = Truncate-128(H(min(NK.x, PK.x) | max(NK.x, PK.x))) */
nkx = dpp_get_pubkey_point(own_key, 0);
pkx = dpp_get_pubkey_point(peer_key, 0);
if (!nkx || !pkx)
goto fail;
addr[0] = wpabuf_head(nkx);
len[0] = wpabuf_len(nkx) / 2;
addr[1] = wpabuf_head(pkx);
len[1] = wpabuf_len(pkx) / 2;
if (len[0] != len[1])
goto fail;
if (os_memcmp(addr[0], addr[1], len[0]) > 0) {
addr[0] = wpabuf_head(pkx);
addr[1] = wpabuf_head(nkx);
}
wpa_hexdump(MSG_DEBUG, "DPP: PMKID hash payload 1", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DPP: PMKID hash payload 2", addr[1], len[1]);
res = sha256_vector(2, addr, len, hash);
if (res < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: PMKID hash output", hash, SHA256_MAC_LEN);
os_memcpy(pmkid, hash, PMKID_LEN);
wpa_hexdump(MSG_DEBUG, "DPP: PMKID", pmkid, PMKID_LEN);
ret = 0;
fail:
wpabuf_free(nkx);
wpabuf_free(pkx);
return ret;
}
enum dpp_status_error
dpp_peer_intro(struct dpp_introduction *intro, const char *own_connector,
const u8 *net_access_key, size_t net_access_key_len,
const u8 *csign_key, size_t csign_key_len,
const u8 *peer_connector, size_t peer_connector_len,
os_time_t *expiry)
{
struct json_token *root = NULL, *netkey, *token;
struct json_token *own_root = NULL;
enum dpp_status_error ret = 255, res;
EVP_PKEY *own_key = NULL, *peer_key = NULL;
struct wpabuf *own_key_pub = NULL;
const struct dpp_curve_params *curve, *own_curve;
struct dpp_signed_connector_info info;
const unsigned char *p;
EVP_PKEY *csign = NULL;
char *signed_connector = NULL;
const char *pos, *end;
unsigned char *own_conn = NULL;
size_t own_conn_len;
size_t Nx_len;
u8 Nx[DPP_MAX_SHARED_SECRET_LEN];
os_memset(intro, 0, sizeof(*intro));
os_memset(&info, 0, sizeof(info));
if (expiry)
*expiry = 0;
p = csign_key;
csign = d2i_PUBKEY(NULL, &p, csign_key_len);
if (!csign) {
wpa_printf(MSG_ERROR,
"DPP: Failed to parse local C-sign-key information");
goto fail;
}
own_key = dpp_set_keypair(&own_curve, net_access_key,
net_access_key_len);
if (!own_key) {
wpa_printf(MSG_ERROR, "DPP: Failed to parse own netAccessKey");
goto fail;
}
pos = os_strchr(own_connector, '.');
if (!pos) {
wpa_printf(MSG_DEBUG, "DPP: Own connector is missing the first dot (.)");
goto fail;
}
pos++;
end = os_strchr(pos, '.');
if (!end) {
wpa_printf(MSG_DEBUG, "DPP: Own connector is missing the second dot (.)");
goto fail;
}
own_conn = base64_url_decode((const unsigned char *) pos,
end - pos, &own_conn_len);
if (!own_conn) {
wpa_printf(MSG_DEBUG,
"DPP: Failed to base64url decode own signedConnector JWS Payload");
goto fail;
}
own_root = json_parse((const char *) own_conn, own_conn_len);
if (!own_root) {
wpa_printf(MSG_DEBUG, "DPP: Failed to parse local connector");
goto fail;
}
wpa_hexdump_ascii(MSG_DEBUG, "DPP: Peer signedConnector",
peer_connector, peer_connector_len);
signed_connector = os_malloc(peer_connector_len + 1);
if (!signed_connector)
goto fail;
os_memcpy(signed_connector, peer_connector, peer_connector_len);
signed_connector[peer_connector_len] = '\0';
res = dpp_process_signed_connector(&info, csign, signed_connector);
if (res != DPP_STATUS_OK) {
ret = res;
goto fail;
}
root = json_parse((const char *) info.payload, info.payload_len);
if (!root) {
wpa_printf(MSG_DEBUG, "DPP: JSON parsing of connector failed");
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
if (!dpp_connector_match_groups(own_root, root)) {
wpa_printf(MSG_DEBUG,
"DPP: Peer connector does not include compatible group netrole with own connector");
ret = DPP_STATUS_NO_MATCH;
goto fail;
}
token = json_get_member(root, "expiry");
if (!token || token->type != JSON_STRING) {
wpa_printf(MSG_DEBUG,
"DPP: No expiry string found - connector does not expire");
} else {
wpa_printf(MSG_DEBUG, "DPP: expiry = %s", token->string);
if (dpp_key_expired(token->string, expiry)) {
wpa_printf(MSG_DEBUG,
"DPP: Connector (netAccessKey) has expired");
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
}
netkey = json_get_member(root, "netAccessKey");
if (!netkey || netkey->type != JSON_OBJECT) {
wpa_printf(MSG_DEBUG, "DPP: No netAccessKey object found");
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
peer_key = dpp_parse_jwk(netkey, &curve);
if (!peer_key) {
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
dpp_debug_print_key("DPP: Received netAccessKey", peer_key);
if (own_curve != curve) {
wpa_printf(MSG_DEBUG,
"DPP: Mismatching netAccessKey curves (%s != %s)",
own_curve->name, curve->name);
ret = DPP_STATUS_INVALID_CONNECTOR;
goto fail;
}
/* ECDH: N = nk * PK */
if (dpp_ecdh(own_key, peer_key, Nx, &Nx_len) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (N.x)",
Nx, Nx_len);
/* PMK = HKDF(<>, "DPP PMK", N.x) */
if (dpp_derive_pmk(Nx, Nx_len, intro->pmk, curve->hash_len) < 0) {
wpa_printf(MSG_ERROR, "DPP: Failed to derive PMK");
goto fail;
}
intro->pmk_len = curve->hash_len;
/* PMKID = Truncate-128(H(min(NK.x, PK.x) | max(NK.x, PK.x))) */
if (dpp_derive_pmkid(curve, own_key, peer_key, intro->pmkid) < 0) {
wpa_printf(MSG_ERROR, "DPP: Failed to derive PMKID");
goto fail;
}
ret = DPP_STATUS_OK;
fail:
if (ret != DPP_STATUS_OK)
os_memset(intro, 0, sizeof(*intro));
os_memset(Nx, 0, sizeof(Nx));
os_free(own_conn);
os_free(signed_connector);
os_free(info.payload);
EVP_PKEY_free(own_key);
wpabuf_free(own_key_pub);
EVP_PKEY_free(peer_key);
EVP_PKEY_free(csign);
json_free(root);
json_free(own_root);
return ret;
}
static EVP_PKEY * dpp_pkex_get_role_elem(const struct dpp_curve_params *curve,
int init)
{
EC_GROUP *group;
size_t len = curve->prime_len;
const u8 *x, *y;
EVP_PKEY *res;
switch (curve->ike_group) {
case 19:
x = init ? pkex_init_x_p256 : pkex_resp_x_p256;
y = init ? pkex_init_y_p256 : pkex_resp_y_p256;
break;
case 20:
x = init ? pkex_init_x_p384 : pkex_resp_x_p384;
y = init ? pkex_init_y_p384 : pkex_resp_y_p384;
break;
case 21:
x = init ? pkex_init_x_p521 : pkex_resp_x_p521;
y = init ? pkex_init_y_p521 : pkex_resp_y_p521;
break;
case 28:
x = init ? pkex_init_x_bp_p256r1 : pkex_resp_x_bp_p256r1;
y = init ? pkex_init_y_bp_p256r1 : pkex_resp_y_bp_p256r1;
break;
case 29:
x = init ? pkex_init_x_bp_p384r1 : pkex_resp_x_bp_p384r1;
y = init ? pkex_init_y_bp_p384r1 : pkex_resp_y_bp_p384r1;
break;
case 30:
x = init ? pkex_init_x_bp_p512r1 : pkex_resp_x_bp_p512r1;
y = init ? pkex_init_y_bp_p512r1 : pkex_resp_y_bp_p512r1;
break;
default:
return NULL;
}
group = EC_GROUP_new_by_curve_name(OBJ_txt2nid(curve->name));
if (!group)
return NULL;
res = dpp_set_pubkey_point_group(group, x, y, len);
EC_GROUP_free(group);
return res;
}
static EC_POINT * dpp_pkex_derive_Qi(const struct dpp_curve_params *curve,
const u8 *mac_init, const char *code,
const char *identifier, BN_CTX *bnctx,
EC_GROUP **ret_group)
{
u8 hash[DPP_MAX_HASH_LEN];
const u8 *addr[3];
size_t len[3];
unsigned int num_elem = 0;
EC_POINT *Qi = NULL;
EVP_PKEY *Pi = NULL;
EC_KEY *Pi_ec = NULL;
const EC_POINT *Pi_point;
BIGNUM *hash_bn = NULL;
const EC_GROUP *group = NULL;
EC_GROUP *group2 = NULL;
/* Qi = H(MAC-Initiator | [identifier |] code) * Pi */
wpa_printf(MSG_DEBUG, "DPP: MAC-Initiator: " MACSTR, MAC2STR(mac_init));
addr[num_elem] = mac_init;
len[num_elem] = ETH_ALEN;
num_elem++;
if (identifier) {
wpa_printf(MSG_DEBUG, "DPP: code identifier: %s",
identifier);
addr[num_elem] = (const u8 *) identifier;
len[num_elem] = os_strlen(identifier);
num_elem++;
}
wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: code", code, os_strlen(code));
addr[num_elem] = (const u8 *) code;
len[num_elem] = os_strlen(code);
num_elem++;
if (dpp_hash_vector(curve, num_elem, addr, len, hash) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG,
"DPP: H(MAC-Initiator | [identifier |] code)",
hash, curve->hash_len);
Pi = dpp_pkex_get_role_elem(curve, 1);
if (!Pi)
goto fail;
dpp_debug_print_key("DPP: Pi", Pi);
Pi_ec = EVP_PKEY_get1_EC_KEY(Pi);
if (!Pi_ec)
goto fail;
Pi_point = EC_KEY_get0_public_key(Pi_ec);
group = EC_KEY_get0_group(Pi_ec);
if (!group)
goto fail;
group2 = EC_GROUP_dup(group);
if (!group2)
goto fail;
Qi = EC_POINT_new(group2);
if (!Qi) {
EC_GROUP_free(group2);
goto fail;
}
hash_bn = BN_bin2bn(hash, curve->hash_len, NULL);
if (!hash_bn ||
EC_POINT_mul(group2, Qi, NULL, Pi_point, hash_bn, bnctx) != 1)
goto fail;
if (EC_POINT_is_at_infinity(group, Qi)) {
wpa_printf(MSG_INFO, "DPP: Qi is the point-at-infinity");
goto fail;
}
dpp_debug_print_point("DPP: Qi", group, Qi);
out:
EC_KEY_free(Pi_ec);
EVP_PKEY_free(Pi);
BN_clear_free(hash_bn);
if (ret_group && Qi)
*ret_group = group2;
else
EC_GROUP_free(group2);
return Qi;
fail:
EC_POINT_free(Qi);
Qi = NULL;
goto out;
}
static EC_POINT * dpp_pkex_derive_Qr(const struct dpp_curve_params *curve,
const u8 *mac_resp, const char *code,
const char *identifier, BN_CTX *bnctx,
EC_GROUP **ret_group)
{
u8 hash[DPP_MAX_HASH_LEN];
const u8 *addr[3];
size_t len[3];
unsigned int num_elem = 0;
EC_POINT *Qr = NULL;
EVP_PKEY *Pr = NULL;
EC_KEY *Pr_ec = NULL;
const EC_POINT *Pr_point;
BIGNUM *hash_bn = NULL;
const EC_GROUP *group = NULL;
EC_GROUP *group2 = NULL;
/* Qr = H(MAC-Responder | | [identifier | ] code) * Pr */
wpa_printf(MSG_DEBUG, "DPP: MAC-Responder: " MACSTR, MAC2STR(mac_resp));
addr[num_elem] = mac_resp;
len[num_elem] = ETH_ALEN;
num_elem++;
if (identifier) {
wpa_printf(MSG_DEBUG, "DPP: code identifier: %s",
identifier);
addr[num_elem] = (const u8 *) identifier;
len[num_elem] = os_strlen(identifier);
num_elem++;
}
wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: code", code, os_strlen(code));
addr[num_elem] = (const u8 *) code;
len[num_elem] = os_strlen(code);
num_elem++;
if (dpp_hash_vector(curve, num_elem, addr, len, hash) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG,
"DPP: H(MAC-Responder | [identifier |] code)",
hash, curve->hash_len);
Pr = dpp_pkex_get_role_elem(curve, 0);
if (!Pr)
goto fail;
dpp_debug_print_key("DPP: Pr", Pr);
Pr_ec = EVP_PKEY_get1_EC_KEY(Pr);
if (!Pr_ec)
goto fail;
Pr_point = EC_KEY_get0_public_key(Pr_ec);
group = EC_KEY_get0_group(Pr_ec);
if (!group)
goto fail;
group2 = EC_GROUP_dup(group);
if (!group2)
goto fail;
Qr = EC_POINT_new(group2);
if (!Qr) {
EC_GROUP_free(group2);
goto fail;
}
hash_bn = BN_bin2bn(hash, curve->hash_len, NULL);
if (!hash_bn ||
EC_POINT_mul(group2, Qr, NULL, Pr_point, hash_bn, bnctx) != 1)
goto fail;
if (EC_POINT_is_at_infinity(group, Qr)) {
wpa_printf(MSG_INFO, "DPP: Qr is the point-at-infinity");
goto fail;
}
dpp_debug_print_point("DPP: Qr", group, Qr);
out:
EC_KEY_free(Pr_ec);
EVP_PKEY_free(Pr);
BN_clear_free(hash_bn);
if (ret_group && Qr)
*ret_group = group2;
else
EC_GROUP_free(group2);
return Qr;
fail:
EC_POINT_free(Qr);
Qr = NULL;
goto out;
}
#ifdef CONFIG_TESTING_OPTIONS
static int dpp_test_gen_invalid_key(struct wpabuf *msg,
const struct dpp_curve_params *curve)
{
BN_CTX *ctx;
BIGNUM *x, *y;
int ret = -1;
EC_GROUP *group;
EC_POINT *point;
group = EC_GROUP_new_by_curve_name(OBJ_txt2nid(curve->name));
if (!group)
return -1;
ctx = BN_CTX_new();
point = EC_POINT_new(group);
x = BN_new();
y = BN_new();
if (!ctx || !point || !x || !y)
goto fail;
if (BN_rand(x, curve->prime_len * 8, 0, 0) != 1)
goto fail;
/* Generate a random y coordinate that results in a point that is not
* on the curve. */
for (;;) {
if (BN_rand(y, curve->prime_len * 8, 0, 0) != 1)
goto fail;
if (EC_POINT_set_affine_coordinates_GFp(group, point, x, y,
ctx) != 1) {
#if OPENSSL_VERSION_NUMBER >= 0x10100000L || defined(OPENSSL_IS_BORINGSSL)
/* Unlike older OpenSSL versions, OpenSSL 1.1.1 and BoringSSL
* return an error from EC_POINT_set_affine_coordinates_GFp()
* when the point is not on the curve. */
break;
#else /* >=1.1.0 or OPENSSL_IS_BORINGSSL */
goto fail;
#endif /* >= 1.1.0 or OPENSSL_IS_BORINGSSL */
}
if (!EC_POINT_is_on_curve(group, point, ctx))
break;
}
if (dpp_bn2bin_pad(x, wpabuf_put(msg, curve->prime_len),
curve->prime_len) < 0 ||
dpp_bn2bin_pad(y, wpabuf_put(msg, curve->prime_len),
curve->prime_len) < 0)
goto fail;
ret = 0;
fail:
if (ret < 0)
wpa_printf(MSG_INFO, "DPP: Failed to generate invalid key");
BN_free(x);
BN_free(y);
EC_POINT_free(point);
BN_CTX_free(ctx);
EC_GROUP_free(group);
return ret;
}
#endif /* CONFIG_TESTING_OPTIONS */
static struct wpabuf * dpp_pkex_build_exchange_req(struct dpp_pkex *pkex)
{
EC_KEY *X_ec = NULL;
const EC_POINT *X_point;
BN_CTX *bnctx = NULL;
EC_GROUP *group = NULL;
EC_POINT *Qi = NULL, *M = NULL;
struct wpabuf *M_buf = NULL;
BIGNUM *Mx = NULL, *My = NULL;
struct wpabuf *msg = NULL;
size_t attr_len;
const struct dpp_curve_params *curve = pkex->own_bi->curve;
wpa_printf(MSG_DEBUG, "DPP: Build PKEX Exchange Request");
/* Qi = H(MAC-Initiator | [identifier |] code) * Pi */
bnctx = BN_CTX_new();
if (!bnctx)
goto fail;
Qi = dpp_pkex_derive_Qi(curve, pkex->own_mac, pkex->code,
pkex->identifier, bnctx, &group);
if (!Qi)
goto fail;
/* Generate a random ephemeral keypair x/X */
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_pkex_ephemeral_key_override_len) {
const struct dpp_curve_params *tmp_curve;
wpa_printf(MSG_INFO,
"DPP: TESTING - override ephemeral key x/X");
pkex->x = dpp_set_keypair(&tmp_curve,
dpp_pkex_ephemeral_key_override,
dpp_pkex_ephemeral_key_override_len);
} else {
pkex->x = dpp_gen_keypair(curve);
}
#else /* CONFIG_TESTING_OPTIONS */
pkex->x = dpp_gen_keypair(curve);
#endif /* CONFIG_TESTING_OPTIONS */
if (!pkex->x)
goto fail;
/* M = X + Qi */
X_ec = EVP_PKEY_get1_EC_KEY(pkex->x);
if (!X_ec)
goto fail;
X_point = EC_KEY_get0_public_key(X_ec);
if (!X_point)
goto fail;
dpp_debug_print_point("DPP: X", group, X_point);
M = EC_POINT_new(group);
Mx = BN_new();
My = BN_new();
if (!M || !Mx || !My ||
EC_POINT_add(group, M, X_point, Qi, bnctx) != 1 ||
EC_POINT_get_affine_coordinates_GFp(group, M, Mx, My, bnctx) != 1)
goto fail;
dpp_debug_print_point("DPP: M", group, M);
/* Initiator -> Responder: group, [identifier,] M */
attr_len = 4 + 2;
if (pkex->identifier)
attr_len += 4 + os_strlen(pkex->identifier);
attr_len += 4 + 2 * curve->prime_len;
msg = dpp_alloc_msg(DPP_PA_PKEX_EXCHANGE_REQ, attr_len);
if (!msg)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_FINITE_CYCLIC_GROUP_PKEX_EXCHANGE_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Finite Cyclic Group");
goto skip_finite_cyclic_group;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* Finite Cyclic Group attribute */
wpabuf_put_le16(msg, DPP_ATTR_FINITE_CYCLIC_GROUP);
wpabuf_put_le16(msg, 2);
wpabuf_put_le16(msg, curve->ike_group);
#ifdef CONFIG_TESTING_OPTIONS
skip_finite_cyclic_group:
#endif /* CONFIG_TESTING_OPTIONS */
/* Code Identifier attribute */
if (pkex->identifier) {
wpabuf_put_le16(msg, DPP_ATTR_CODE_IDENTIFIER);
wpabuf_put_le16(msg, os_strlen(pkex->identifier));
wpabuf_put_str(msg, pkex->identifier);
}
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_ENCRYPTED_KEY_PKEX_EXCHANGE_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Encrypted Key");
goto out;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* M in Encrypted Key attribute */
wpabuf_put_le16(msg, DPP_ATTR_ENCRYPTED_KEY);
wpabuf_put_le16(msg, 2 * curve->prime_len);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_INVALID_ENCRYPTED_KEY_PKEX_EXCHANGE_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Encrypted Key");
if (dpp_test_gen_invalid_key(msg, curve) < 0)
goto fail;
goto out;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (dpp_bn2bin_pad(Mx, wpabuf_put(msg, curve->prime_len),
curve->prime_len) < 0 ||
dpp_bn2bin_pad(Mx, pkex->Mx, curve->prime_len) < 0 ||
dpp_bn2bin_pad(My, wpabuf_put(msg, curve->prime_len),
curve->prime_len) < 0)
goto fail;
out:
wpabuf_free(M_buf);
EC_KEY_free(X_ec);
EC_POINT_free(M);
EC_POINT_free(Qi);
BN_clear_free(Mx);
BN_clear_free(My);
BN_CTX_free(bnctx);
EC_GROUP_free(group);
return msg;
fail:
wpa_printf(MSG_INFO, "DPP: Failed to build PKEX Exchange Request");
wpabuf_free(msg);
msg = NULL;
goto out;
}
static void dpp_pkex_fail(struct dpp_pkex *pkex, const char *txt)
{
wpa_msg(pkex->msg_ctx, MSG_INFO, DPP_EVENT_FAIL "%s", txt);
}
struct dpp_pkex * dpp_pkex_init(void *msg_ctx, struct dpp_bootstrap_info *bi,
const u8 *own_mac,
const char *identifier,
const char *code)
{
struct dpp_pkex *pkex;
#ifdef CONFIG_TESTING_OPTIONS
if (!is_zero_ether_addr(dpp_pkex_own_mac_override)) {
wpa_printf(MSG_INFO, "DPP: TESTING - own_mac override " MACSTR,
MAC2STR(dpp_pkex_own_mac_override));
own_mac = dpp_pkex_own_mac_override;
}
#endif /* CONFIG_TESTING_OPTIONS */
pkex = os_zalloc(sizeof(*pkex));
if (!pkex)
return NULL;
pkex->msg_ctx = msg_ctx;
pkex->initiator = 1;
pkex->own_bi = bi;
os_memcpy(pkex->own_mac, own_mac, ETH_ALEN);
if (identifier) {
pkex->identifier = os_strdup(identifier);
if (!pkex->identifier)
goto fail;
}
pkex->code = os_strdup(code);
if (!pkex->code)
goto fail;
pkex->exchange_req = dpp_pkex_build_exchange_req(pkex);
if (!pkex->exchange_req)
goto fail;
return pkex;
fail:
dpp_pkex_free(pkex);
return NULL;
}
static struct wpabuf *
dpp_pkex_build_exchange_resp(struct dpp_pkex *pkex,
enum dpp_status_error status,
const BIGNUM *Nx, const BIGNUM *Ny)
{
struct wpabuf *msg = NULL;
size_t attr_len;
const struct dpp_curve_params *curve = pkex->own_bi->curve;
/* Initiator -> Responder: DPP Status, [identifier,] N */
attr_len = 4 + 1;
if (pkex->identifier)
attr_len += 4 + os_strlen(pkex->identifier);
attr_len += 4 + 2 * curve->prime_len;
msg = dpp_alloc_msg(DPP_PA_PKEX_EXCHANGE_RESP, attr_len);
if (!msg)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_STATUS_PKEX_EXCHANGE_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Status");
goto skip_status;
}
if (dpp_test == DPP_TEST_INVALID_STATUS_PKEX_EXCHANGE_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Status");
status = 255;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* DPP Status */
dpp_build_attr_status(msg, status);
#ifdef CONFIG_TESTING_OPTIONS
skip_status:
#endif /* CONFIG_TESTING_OPTIONS */
/* Code Identifier attribute */
if (pkex->identifier) {
wpabuf_put_le16(msg, DPP_ATTR_CODE_IDENTIFIER);
wpabuf_put_le16(msg, os_strlen(pkex->identifier));
wpabuf_put_str(msg, pkex->identifier);
}
if (status != DPP_STATUS_OK)
goto skip_encrypted_key;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_ENCRYPTED_KEY_PKEX_EXCHANGE_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Encrypted Key");
goto skip_encrypted_key;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* N in Encrypted Key attribute */
wpabuf_put_le16(msg, DPP_ATTR_ENCRYPTED_KEY);
wpabuf_put_le16(msg, 2 * curve->prime_len);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_INVALID_ENCRYPTED_KEY_PKEX_EXCHANGE_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Encrypted Key");
if (dpp_test_gen_invalid_key(msg, curve) < 0)
goto fail;
goto skip_encrypted_key;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (dpp_bn2bin_pad(Nx, wpabuf_put(msg, curve->prime_len),
curve->prime_len) < 0 ||
dpp_bn2bin_pad(Nx, pkex->Nx, curve->prime_len) < 0 ||
dpp_bn2bin_pad(Ny, wpabuf_put(msg, curve->prime_len),
curve->prime_len) < 0)
goto fail;
skip_encrypted_key:
if (status == DPP_STATUS_BAD_GROUP) {
/* Finite Cyclic Group attribute */
wpabuf_put_le16(msg, DPP_ATTR_FINITE_CYCLIC_GROUP);
wpabuf_put_le16(msg, 2);
wpabuf_put_le16(msg, curve->ike_group);
}
return msg;
fail:
wpabuf_free(msg);
return NULL;
}
static int dpp_pkex_derive_z(const u8 *mac_init, const u8 *mac_resp,
const u8 *Mx, size_t Mx_len,
const u8 *Nx, size_t Nx_len,
const char *code,
const u8 *Kx, size_t Kx_len,
u8 *z, unsigned int hash_len)
{
u8 salt[DPP_MAX_HASH_LEN], prk[DPP_MAX_HASH_LEN];
int res;
u8 *info, *pos;
size_t info_len;
/* z = HKDF(<>, MAC-Initiator | MAC-Responder | M.x | N.x | code, K.x)
*/
/* HKDF-Extract(<>, IKM=K.x) */
os_memset(salt, 0, hash_len);
if (dpp_hmac(hash_len, salt, hash_len, Kx, Kx_len, prk) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM)",
prk, hash_len);
info_len = 2 * ETH_ALEN + Mx_len + Nx_len + os_strlen(code);
info = os_malloc(info_len);
if (!info)
return -1;
pos = info;
os_memcpy(pos, mac_init, ETH_ALEN);
pos += ETH_ALEN;
os_memcpy(pos, mac_resp, ETH_ALEN);
pos += ETH_ALEN;
os_memcpy(pos, Mx, Mx_len);
pos += Mx_len;
os_memcpy(pos, Nx, Nx_len);
pos += Nx_len;
os_memcpy(pos, code, os_strlen(code));
/* HKDF-Expand(PRK, info, L) */
if (hash_len == 32)
res = hmac_sha256_kdf(prk, hash_len, NULL, info, info_len,
z, hash_len);
else if (hash_len == 48)
res = hmac_sha384_kdf(prk, hash_len, NULL, info, info_len,
z, hash_len);
else if (hash_len == 64)
res = hmac_sha512_kdf(prk, hash_len, NULL, info, info_len,
z, hash_len);
else
res = -1;
os_free(info);
os_memset(prk, 0, hash_len);
if (res < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "DPP: z = HKDF-Expand(PRK, info, L)",
z, hash_len);
return 0;
}
static int dpp_pkex_identifier_match(const u8 *attr_id, u16 attr_id_len,
const char *identifier)
{
if (!attr_id && identifier) {
wpa_printf(MSG_DEBUG,
"DPP: No PKEX code identifier received, but expected one");
return 0;
}
if (attr_id && !identifier) {
wpa_printf(MSG_DEBUG,
"DPP: PKEX code identifier received, but not expecting one");
return 0;
}
if (attr_id && identifier &&
(os_strlen(identifier) != attr_id_len ||
os_memcmp(identifier, attr_id, attr_id_len) != 0)) {
wpa_printf(MSG_DEBUG, "DPP: PKEX code identifier mismatch");
return 0;
}
return 1;
}
struct dpp_pkex * dpp_pkex_rx_exchange_req(void *msg_ctx,
struct dpp_bootstrap_info *bi,
const u8 *own_mac,
const u8 *peer_mac,
const char *identifier,
const char *code,
const u8 *buf, size_t len)
{
const u8 *attr_group, *attr_id, *attr_key;
u16 attr_group_len, attr_id_len, attr_key_len;
const struct dpp_curve_params *curve = bi->curve;
u16 ike_group;
struct dpp_pkex *pkex = NULL;
EC_POINT *Qi = NULL, *Qr = NULL, *M = NULL, *X = NULL, *N = NULL;
BN_CTX *bnctx = NULL;
EC_GROUP *group = NULL;
BIGNUM *Mx = NULL, *My = NULL;
EC_KEY *Y_ec = NULL, *X_ec = NULL;;
const EC_POINT *Y_point;
BIGNUM *Nx = NULL, *Ny = NULL;
u8 Kx[DPP_MAX_SHARED_SECRET_LEN];
size_t Kx_len;
int res;
if (bi->pkex_t >= PKEX_COUNTER_T_LIMIT) {
wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
"PKEX counter t limit reached - ignore message");
return NULL;
}
#ifdef CONFIG_TESTING_OPTIONS
if (!is_zero_ether_addr(dpp_pkex_peer_mac_override)) {
wpa_printf(MSG_INFO, "DPP: TESTING - peer_mac override " MACSTR,
MAC2STR(dpp_pkex_peer_mac_override));
peer_mac = dpp_pkex_peer_mac_override;
}
if (!is_zero_ether_addr(dpp_pkex_own_mac_override)) {
wpa_printf(MSG_INFO, "DPP: TESTING - own_mac override " MACSTR,
MAC2STR(dpp_pkex_own_mac_override));
own_mac = dpp_pkex_own_mac_override;
}
#endif /* CONFIG_TESTING_OPTIONS */
attr_id_len = 0;
attr_id = dpp_get_attr(buf, len, DPP_ATTR_CODE_IDENTIFIER,
&attr_id_len);
if (!dpp_pkex_identifier_match(attr_id, attr_id_len, identifier))
return NULL;
attr_group = dpp_get_attr(buf, len, DPP_ATTR_FINITE_CYCLIC_GROUP,
&attr_group_len);
if (!attr_group || attr_group_len != 2) {
wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
"Missing or invalid Finite Cyclic Group attribute");
return NULL;
}
ike_group = WPA_GET_LE16(attr_group);
if (ike_group != curve->ike_group) {
wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
"Mismatching PKEX curve: peer=%u own=%u",
ike_group, curve->ike_group);
pkex = os_zalloc(sizeof(*pkex));
if (!pkex)
goto fail;
pkex->own_bi = bi;
pkex->failed = 1;
pkex->exchange_resp = dpp_pkex_build_exchange_resp(
pkex, DPP_STATUS_BAD_GROUP, NULL, NULL);
if (!pkex->exchange_resp)
goto fail;
return pkex;
}
/* M in Encrypted Key attribute */
attr_key = dpp_get_attr(buf, len, DPP_ATTR_ENCRYPTED_KEY,
&attr_key_len);
if (!attr_key || attr_key_len & 0x01 || attr_key_len < 2 ||
attr_key_len / 2 > DPP_MAX_SHARED_SECRET_LEN) {
wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
"Missing Encrypted Key attribute");
return NULL;
}
/* Qi = H(MAC-Initiator | [identifier |] code) * Pi */
bnctx = BN_CTX_new();
if (!bnctx)
goto fail;
Qi = dpp_pkex_derive_Qi(curve, peer_mac, code, identifier, bnctx,
&group);
if (!Qi)
goto fail;
/* X' = M - Qi */
X = EC_POINT_new(group);
M = EC_POINT_new(group);
Mx = BN_bin2bn(attr_key, attr_key_len / 2, NULL);
My = BN_bin2bn(attr_key + attr_key_len / 2, attr_key_len / 2, NULL);
if (!X || !M || !Mx || !My ||
EC_POINT_set_affine_coordinates_GFp(group, M, Mx, My, bnctx) != 1 ||
EC_POINT_is_at_infinity(group, M) ||
!EC_POINT_is_on_curve(group, M, bnctx) ||
EC_POINT_invert(group, Qi, bnctx) != 1 ||
EC_POINT_add(group, X, M, Qi, bnctx) != 1 ||
EC_POINT_is_at_infinity(group, X) ||
!EC_POINT_is_on_curve(group, X, bnctx)) {
wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
"Invalid Encrypted Key value");
bi->pkex_t++;
goto fail;
}
dpp_debug_print_point("DPP: M", group, M);
dpp_debug_print_point("DPP: X'", group, X);
pkex = os_zalloc(sizeof(*pkex));
if (!pkex)
goto fail;
pkex->t = bi->pkex_t;
pkex->msg_ctx = msg_ctx;
pkex->own_bi = bi;
os_memcpy(pkex->own_mac, own_mac, ETH_ALEN);
os_memcpy(pkex->peer_mac, peer_mac, ETH_ALEN);
if (identifier) {
pkex->identifier = os_strdup(identifier);
if (!pkex->identifier)
goto fail;
}
pkex->code = os_strdup(code);
if (!pkex->code)
goto fail;
os_memcpy(pkex->Mx, attr_key, attr_key_len / 2);
X_ec = EC_KEY_new();
if (!X_ec ||
EC_KEY_set_group(X_ec, group) != 1 ||
EC_KEY_set_public_key(X_ec, X) != 1)
goto fail;
pkex->x = EVP_PKEY_new();
if (!pkex->x ||
EVP_PKEY_set1_EC_KEY(pkex->x, X_ec) != 1)
goto fail;
/* Qr = H(MAC-Responder | | [identifier | ] code) * Pr */
Qr = dpp_pkex_derive_Qr(curve, own_mac, code, identifier, bnctx, NULL);
if (!Qr)
goto fail;
/* Generate a random ephemeral keypair y/Y */
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_pkex_ephemeral_key_override_len) {
const struct dpp_curve_params *tmp_curve;
wpa_printf(MSG_INFO,
"DPP: TESTING - override ephemeral key y/Y");
pkex->y = dpp_set_keypair(&tmp_curve,
dpp_pkex_ephemeral_key_override,
dpp_pkex_ephemeral_key_override_len);
} else {
pkex->y = dpp_gen_keypair(curve);
}
#else /* CONFIG_TESTING_OPTIONS */
pkex->y = dpp_gen_keypair(curve);
#endif /* CONFIG_TESTING_OPTIONS */
if (!pkex->y)
goto fail;
/* N = Y + Qr */
Y_ec = EVP_PKEY_get1_EC_KEY(pkex->y);
if (!Y_ec)
goto fail;
Y_point = EC_KEY_get0_public_key(Y_ec);
if (!Y_point)
goto fail;
dpp_debug_print_point("DPP: Y", group, Y_point);
N = EC_POINT_new(group);
Nx = BN_new();
Ny = BN_new();
if (!N || !Nx || !Ny ||
EC_POINT_add(group, N, Y_point, Qr, bnctx) != 1 ||
EC_POINT_get_affine_coordinates_GFp(group, N, Nx, Ny, bnctx) != 1)
goto fail;
dpp_debug_print_point("DPP: N", group, N);
pkex->exchange_resp = dpp_pkex_build_exchange_resp(pkex, DPP_STATUS_OK,
Nx, Ny);
if (!pkex->exchange_resp)
goto fail;
/* K = y * X' */
if (dpp_ecdh(pkex->y, pkex->x, Kx, &Kx_len) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (K.x)",
Kx, Kx_len);
/* z = HKDF(<>, MAC-Initiator | MAC-Responder | M.x | N.x | code, K.x)
*/
res = dpp_pkex_derive_z(pkex->peer_mac, pkex->own_mac,
pkex->Mx, curve->prime_len,
pkex->Nx, curve->prime_len, pkex->code,
Kx, Kx_len, pkex->z, curve->hash_len);
os_memset(Kx, 0, Kx_len);
if (res < 0)
goto fail;
pkex->exchange_done = 1;
out:
BN_CTX_free(bnctx);
EC_POINT_free(Qi);
EC_POINT_free(Qr);
BN_free(Mx);
BN_free(My);
BN_free(Nx);
BN_free(Ny);
EC_POINT_free(M);
EC_POINT_free(N);
EC_POINT_free(X);
EC_KEY_free(X_ec);
EC_KEY_free(Y_ec);
EC_GROUP_free(group);
return pkex;
fail:
wpa_printf(MSG_DEBUG, "DPP: PKEX Exchange Request processing failed");
dpp_pkex_free(pkex);
pkex = NULL;
goto out;
}
static struct wpabuf *
dpp_pkex_build_commit_reveal_req(struct dpp_pkex *pkex,
const struct wpabuf *A_pub, const u8 *u)
{
const struct dpp_curve_params *curve = pkex->own_bi->curve;
struct wpabuf *msg = NULL;
size_t clear_len, attr_len;
struct wpabuf *clear = NULL;
u8 *wrapped;
u8 octet;
const u8 *addr[2];
size_t len[2];
/* {A, u, [bootstrapping info]}z */
clear_len = 4 + 2 * curve->prime_len + 4 + curve->hash_len;
clear = wpabuf_alloc(clear_len);
attr_len = 4 + clear_len + AES_BLOCK_SIZE;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_PKEX_CR_REQ)
attr_len += 5;
#endif /* CONFIG_TESTING_OPTIONS */
msg = dpp_alloc_msg(DPP_PA_PKEX_COMMIT_REVEAL_REQ, attr_len);
if (!clear || !msg)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_BOOTSTRAP_KEY_PKEX_CR_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Bootstrap Key");
goto skip_bootstrap_key;
}
if (dpp_test == DPP_TEST_INVALID_BOOTSTRAP_KEY_PKEX_CR_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Bootstrap Key");
wpabuf_put_le16(clear, DPP_ATTR_BOOTSTRAP_KEY);
wpabuf_put_le16(clear, 2 * curve->prime_len);
if (dpp_test_gen_invalid_key(clear, curve) < 0)
goto fail;
goto skip_bootstrap_key;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* A in Bootstrap Key attribute */
wpabuf_put_le16(clear, DPP_ATTR_BOOTSTRAP_KEY);
wpabuf_put_le16(clear, wpabuf_len(A_pub));
wpabuf_put_buf(clear, A_pub);
#ifdef CONFIG_TESTING_OPTIONS
skip_bootstrap_key:
if (dpp_test == DPP_TEST_NO_I_AUTH_TAG_PKEX_CR_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no I-Auth tag");
goto skip_i_auth_tag;
}
if (dpp_test == DPP_TEST_I_AUTH_TAG_MISMATCH_PKEX_CR_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - I-Auth tag mismatch");
wpabuf_put_le16(clear, DPP_ATTR_I_AUTH_TAG);
wpabuf_put_le16(clear, curve->hash_len);
wpabuf_put_data(clear, u, curve->hash_len - 1);
wpabuf_put_u8(clear, u[curve->hash_len - 1] ^ 0x01);
goto skip_i_auth_tag;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* u in I-Auth tag attribute */
wpabuf_put_le16(clear, DPP_ATTR_I_AUTH_TAG);
wpabuf_put_le16(clear, curve->hash_len);
wpabuf_put_data(clear, u, curve->hash_len);
#ifdef CONFIG_TESTING_OPTIONS
skip_i_auth_tag:
if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_PKEX_CR_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
goto skip_wrapped_data;
}
#endif /* CONFIG_TESTING_OPTIONS */
addr[0] = wpabuf_head_u8(msg) + 2;
len[0] = DPP_HDR_LEN;
octet = 0;
addr[1] = &octet;
len[1] = sizeof(octet);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
if (aes_siv_encrypt(pkex->z, curve->hash_len,
wpabuf_head(clear), wpabuf_len(clear),
2, addr, len, wrapped) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_PKEX_CR_REQ) {
wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
dpp_build_attr_status(msg, DPP_STATUS_OK);
}
skip_wrapped_data:
#endif /* CONFIG_TESTING_OPTIONS */
out:
wpabuf_free(clear);
return msg;
fail:
wpabuf_free(msg);
msg = NULL;
goto out;
}
struct wpabuf * dpp_pkex_rx_exchange_resp(struct dpp_pkex *pkex,
const u8 *peer_mac,
const u8 *buf, size_t buflen)
{
const u8 *attr_status, *attr_id, *attr_key, *attr_group;
u16 attr_status_len, attr_id_len, attr_key_len, attr_group_len;
EC_GROUP *group = NULL;
BN_CTX *bnctx = NULL;
struct wpabuf *msg = NULL, *A_pub = NULL, *X_pub = NULL, *Y_pub = NULL;
const struct dpp_curve_params *curve = pkex->own_bi->curve;
EC_POINT *Qr = NULL, *Y = NULL, *N = NULL;
BIGNUM *Nx = NULL, *Ny = NULL;
EC_KEY *Y_ec = NULL;
size_t Jx_len, Kx_len;
u8 Jx[DPP_MAX_SHARED_SECRET_LEN], Kx[DPP_MAX_SHARED_SECRET_LEN];
const u8 *addr[4];
size_t len[4];
u8 u[DPP_MAX_HASH_LEN];
int res;
if (pkex->failed || pkex->t >= PKEX_COUNTER_T_LIMIT || !pkex->initiator)
return NULL;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_STOP_AT_PKEX_EXCHANGE_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - stop at PKEX Exchange Response");
pkex->failed = 1;
return NULL;
}
if (!is_zero_ether_addr(dpp_pkex_peer_mac_override)) {
wpa_printf(MSG_INFO, "DPP: TESTING - peer_mac override " MACSTR,
MAC2STR(dpp_pkex_peer_mac_override));
peer_mac = dpp_pkex_peer_mac_override;
}
#endif /* CONFIG_TESTING_OPTIONS */
os_memcpy(pkex->peer_mac, peer_mac, ETH_ALEN);
attr_status = dpp_get_attr(buf, buflen, DPP_ATTR_STATUS,
&attr_status_len);
if (!attr_status || attr_status_len != 1) {
dpp_pkex_fail(pkex, "No DPP Status attribute");
return NULL;
}
wpa_printf(MSG_DEBUG, "DPP: Status %u", attr_status[0]);
if (attr_status[0] == DPP_STATUS_BAD_GROUP) {
attr_group = dpp_get_attr(buf, buflen,
DPP_ATTR_FINITE_CYCLIC_GROUP,
&attr_group_len);
if (attr_group && attr_group_len == 2) {
wpa_msg(pkex->msg_ctx, MSG_INFO, DPP_EVENT_FAIL
"Peer indicated mismatching PKEX group - proposed %u",
WPA_GET_LE16(attr_group));
return NULL;
}
}
if (attr_status[0] != DPP_STATUS_OK) {
dpp_pkex_fail(pkex, "PKEX failed (peer indicated failure)");
return NULL;
}
attr_id_len = 0;
attr_id = dpp_get_attr(buf, buflen, DPP_ATTR_CODE_IDENTIFIER,
&attr_id_len);
if (!dpp_pkex_identifier_match(attr_id, attr_id_len,
pkex->identifier)) {
dpp_pkex_fail(pkex, "PKEX code identifier mismatch");
return NULL;
}
/* N in Encrypted Key attribute */
attr_key = dpp_get_attr(buf, buflen, DPP_ATTR_ENCRYPTED_KEY,
&attr_key_len);
if (!attr_key || attr_key_len & 0x01 || attr_key_len < 2) {
dpp_pkex_fail(pkex, "Missing Encrypted Key attribute");
return NULL;
}
/* Qr = H(MAC-Responder | [identifier |] code) * Pr */
bnctx = BN_CTX_new();
if (!bnctx)
goto fail;
Qr = dpp_pkex_derive_Qr(curve, pkex->peer_mac, pkex->code,
pkex->identifier, bnctx, &group);
if (!Qr)
goto fail;
/* Y' = N - Qr */
Y = EC_POINT_new(group);
N = EC_POINT_new(group);
Nx = BN_bin2bn(attr_key, attr_key_len / 2, NULL);
Ny = BN_bin2bn(attr_key + attr_key_len / 2, attr_key_len / 2, NULL);
if (!Y || !N || !Nx || !Ny ||
EC_POINT_set_affine_coordinates_GFp(group, N, Nx, Ny, bnctx) != 1 ||
EC_POINT_is_at_infinity(group, N) ||
!EC_POINT_is_on_curve(group, N, bnctx) ||
EC_POINT_invert(group, Qr, bnctx) != 1 ||
EC_POINT_add(group, Y, N, Qr, bnctx) != 1 ||
EC_POINT_is_at_infinity(group, Y) ||
!EC_POINT_is_on_curve(group, Y, bnctx)) {
dpp_pkex_fail(pkex, "Invalid Encrypted Key value");
pkex->t++;
goto fail;
}
dpp_debug_print_point("DPP: N", group, N);
dpp_debug_print_point("DPP: Y'", group, Y);
pkex->exchange_done = 1;
/* ECDH: J = a * Y’ */
Y_ec = EC_KEY_new();
if (!Y_ec ||
EC_KEY_set_group(Y_ec, group) != 1 ||
EC_KEY_set_public_key(Y_ec, Y) != 1)
goto fail;
pkex->y = EVP_PKEY_new();
if (!pkex->y ||
EVP_PKEY_set1_EC_KEY(pkex->y, Y_ec) != 1)
goto fail;
if (dpp_ecdh(pkex->own_bi->pubkey, pkex->y, Jx, &Jx_len) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (J.x)",
Jx, Jx_len);
/* u = HMAC(J.x, MAC-Initiator | A.x | Y’.x | X.x ) */
A_pub = dpp_get_pubkey_point(pkex->own_bi->pubkey, 0);
Y_pub = dpp_get_pubkey_point(pkex->y, 0);
X_pub = dpp_get_pubkey_point(pkex->x, 0);
if (!A_pub || !Y_pub || !X_pub)
goto fail;
addr[0] = pkex->own_mac;
len[0] = ETH_ALEN;
addr[1] = wpabuf_head(A_pub);
len[1] = wpabuf_len(A_pub) / 2;
addr[2] = wpabuf_head(Y_pub);
len[2] = wpabuf_len(Y_pub) / 2;
addr[3] = wpabuf_head(X_pub);
len[3] = wpabuf_len(X_pub) / 2;
if (dpp_hmac_vector(curve->hash_len, Jx, Jx_len, 4, addr, len, u) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: u", u, curve->hash_len);
/* K = x * Y’ */
if (dpp_ecdh(pkex->x, pkex->y, Kx, &Kx_len) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (K.x)",
Kx, Kx_len);
/* z = HKDF(<>, MAC-Initiator | MAC-Responder | M.x | N.x | code, K.x)
*/
res = dpp_pkex_derive_z(pkex->own_mac, pkex->peer_mac,
pkex->Mx, curve->prime_len,
attr_key /* N.x */, attr_key_len / 2,
pkex->code, Kx, Kx_len,
pkex->z, curve->hash_len);
os_memset(Kx, 0, Kx_len);
if (res < 0)
goto fail;
msg = dpp_pkex_build_commit_reveal_req(pkex, A_pub, u);
if (!msg)
goto fail;
out:
wpabuf_free(A_pub);
wpabuf_free(X_pub);
wpabuf_free(Y_pub);
EC_POINT_free(Qr);
EC_POINT_free(Y);
EC_POINT_free(N);
BN_free(Nx);
BN_free(Ny);
EC_KEY_free(Y_ec);
BN_CTX_free(bnctx);
EC_GROUP_free(group);
return msg;
fail:
wpa_printf(MSG_DEBUG, "DPP: PKEX Exchange Response processing failed");
goto out;
}
static struct wpabuf *
dpp_pkex_build_commit_reveal_resp(struct dpp_pkex *pkex,
const struct wpabuf *B_pub, const u8 *v)
{
const struct dpp_curve_params *curve = pkex->own_bi->curve;
struct wpabuf *msg = NULL;
const u8 *addr[2];
size_t len[2];
u8 octet;
u8 *wrapped;
struct wpabuf *clear = NULL;
size_t clear_len, attr_len;
/* {B, v [bootstrapping info]}z */
clear_len = 4 + 2 * curve->prime_len + 4 + curve->hash_len;
clear = wpabuf_alloc(clear_len);
attr_len = 4 + clear_len + AES_BLOCK_SIZE;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_PKEX_CR_RESP)
attr_len += 5;
#endif /* CONFIG_TESTING_OPTIONS */
msg = dpp_alloc_msg(DPP_PA_PKEX_COMMIT_REVEAL_RESP, attr_len);
if (!clear || !msg)
goto fail;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_NO_BOOTSTRAP_KEY_PKEX_CR_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Bootstrap Key");
goto skip_bootstrap_key;
}
if (dpp_test == DPP_TEST_INVALID_BOOTSTRAP_KEY_PKEX_CR_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - invalid Bootstrap Key");
wpabuf_put_le16(clear, DPP_ATTR_BOOTSTRAP_KEY);
wpabuf_put_le16(clear, 2 * curve->prime_len);
if (dpp_test_gen_invalid_key(clear, curve) < 0)
goto fail;
goto skip_bootstrap_key;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* B in Bootstrap Key attribute */
wpabuf_put_le16(clear, DPP_ATTR_BOOTSTRAP_KEY);
wpabuf_put_le16(clear, wpabuf_len(B_pub));
wpabuf_put_buf(clear, B_pub);
#ifdef CONFIG_TESTING_OPTIONS
skip_bootstrap_key:
if (dpp_test == DPP_TEST_NO_R_AUTH_TAG_PKEX_CR_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no R-Auth tag");
goto skip_r_auth_tag;
}
if (dpp_test == DPP_TEST_R_AUTH_TAG_MISMATCH_PKEX_CR_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - R-Auth tag mismatch");
wpabuf_put_le16(clear, DPP_ATTR_R_AUTH_TAG);
wpabuf_put_le16(clear, curve->hash_len);
wpabuf_put_data(clear, v, curve->hash_len - 1);
wpabuf_put_u8(clear, v[curve->hash_len - 1] ^ 0x01);
goto skip_r_auth_tag;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* v in R-Auth tag attribute */
wpabuf_put_le16(clear, DPP_ATTR_R_AUTH_TAG);
wpabuf_put_le16(clear, curve->hash_len);
wpabuf_put_data(clear, v, curve->hash_len);
#ifdef CONFIG_TESTING_OPTIONS
skip_r_auth_tag:
if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_PKEX_CR_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
goto skip_wrapped_data;
}
#endif /* CONFIG_TESTING_OPTIONS */
addr[0] = wpabuf_head_u8(msg) + 2;
len[0] = DPP_HDR_LEN;
octet = 1;
addr[1] = &octet;
len[1] = sizeof(octet);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
if (aes_siv_encrypt(pkex->z, curve->hash_len,
wpabuf_head(clear), wpabuf_len(clear),
2, addr, len, wrapped) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_PKEX_CR_RESP) {
wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
dpp_build_attr_status(msg, DPP_STATUS_OK);
}
skip_wrapped_data:
#endif /* CONFIG_TESTING_OPTIONS */
out:
wpabuf_free(clear);
return msg;
fail:
wpabuf_free(msg);
msg = NULL;
goto out;
}
struct wpabuf * dpp_pkex_rx_commit_reveal_req(struct dpp_pkex *pkex,
const u8 *hdr,
const u8 *buf, size_t buflen)
{
const struct dpp_curve_params *curve = pkex->own_bi->curve;
size_t Jx_len, Lx_len;
u8 Jx[DPP_MAX_SHARED_SECRET_LEN];
u8 Lx[DPP_MAX_SHARED_SECRET_LEN];
const u8 *wrapped_data, *b_key, *peer_u;
u16 wrapped_data_len, b_key_len, peer_u_len = 0;
const u8 *addr[4];
size_t len[4];
u8 octet;
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
struct wpabuf *msg = NULL, *A_pub = NULL, *X_pub = NULL, *Y_pub = NULL;
struct wpabuf *B_pub = NULL;
u8 u[DPP_MAX_HASH_LEN], v[DPP_MAX_HASH_LEN];
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_STOP_AT_PKEX_CR_REQ) {
wpa_printf(MSG_INFO,
"DPP: TESTING - stop at PKEX CR Request");
pkex->failed = 1;
return NULL;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (!pkex->exchange_done || pkex->failed ||
pkex->t >= PKEX_COUNTER_T_LIMIT || pkex->initiator)
goto fail;
wrapped_data = dpp_get_attr(buf, buflen, DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
dpp_pkex_fail(pkex,
"Missing or invalid required Wrapped Data attribute");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
goto fail;
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
octet = 0;
addr[1] = &octet;
len[1] = sizeof(octet);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
if (aes_siv_decrypt(pkex->z, curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_pkex_fail(pkex,
"AES-SIV decryption failed - possible PKEX code mismatch");
pkex->failed = 1;
pkex->t++;
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_pkex_fail(pkex, "Invalid attribute in unwrapped data");
goto fail;
}
b_key = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_BOOTSTRAP_KEY,
&b_key_len);
if (!b_key || b_key_len != 2 * curve->prime_len) {
dpp_pkex_fail(pkex, "No valid peer bootstrapping key found");
goto fail;
}
pkex->peer_bootstrap_key = dpp_set_pubkey_point(pkex->x, b_key,
b_key_len);
if (!pkex->peer_bootstrap_key) {
dpp_pkex_fail(pkex, "Peer bootstrapping key is invalid");
goto fail;
}
dpp_debug_print_key("DPP: Peer bootstrap public key",
pkex->peer_bootstrap_key);
/* ECDH: J' = y * A' */
if (dpp_ecdh(pkex->y, pkex->peer_bootstrap_key, Jx, &Jx_len) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (J.x)",
Jx, Jx_len);
/* u' = HMAC(J'.x, MAC-Initiator | A'.x | Y.x | X'.x) */
A_pub = dpp_get_pubkey_point(pkex->peer_bootstrap_key, 0);
Y_pub = dpp_get_pubkey_point(pkex->y, 0);
X_pub = dpp_get_pubkey_point(pkex->x, 0);
if (!A_pub || !Y_pub || !X_pub)
goto fail;
addr[0] = pkex->peer_mac;
len[0] = ETH_ALEN;
addr[1] = wpabuf_head(A_pub);
len[1] = wpabuf_len(A_pub) / 2;
addr[2] = wpabuf_head(Y_pub);
len[2] = wpabuf_len(Y_pub) / 2;
addr[3] = wpabuf_head(X_pub);
len[3] = wpabuf_len(X_pub) / 2;
if (dpp_hmac_vector(curve->hash_len, Jx, Jx_len, 4, addr, len, u) < 0)
goto fail;
peer_u = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_AUTH_TAG,
&peer_u_len);
if (!peer_u || peer_u_len != curve->hash_len ||
os_memcmp(peer_u, u, curve->hash_len) != 0) {
dpp_pkex_fail(pkex, "No valid u (I-Auth tag) found");
wpa_hexdump(MSG_DEBUG, "DPP: Calculated u'",
u, curve->hash_len);
wpa_hexdump(MSG_DEBUG, "DPP: Received u", peer_u, peer_u_len);
pkex->t++;
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: Valid u (I-Auth tag) received");
/* ECDH: L = b * X' */
if (dpp_ecdh(pkex->own_bi->pubkey, pkex->x, Lx, &Lx_len) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (L.x)",
Lx, Lx_len);
/* v = HMAC(L.x, MAC-Responder | B.x | X'.x | Y.x) */
B_pub = dpp_get_pubkey_point(pkex->own_bi->pubkey, 0);
if (!B_pub)
goto fail;
addr[0] = pkex->own_mac;
len[0] = ETH_ALEN;
addr[1] = wpabuf_head(B_pub);
len[1] = wpabuf_len(B_pub) / 2;
addr[2] = wpabuf_head(X_pub);
len[2] = wpabuf_len(X_pub) / 2;
addr[3] = wpabuf_head(Y_pub);
len[3] = wpabuf_len(Y_pub) / 2;
if (dpp_hmac_vector(curve->hash_len, Lx, Lx_len, 4, addr, len, v) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: v", v, curve->hash_len);
msg = dpp_pkex_build_commit_reveal_resp(pkex, B_pub, v);
if (!msg)
goto fail;
out:
os_free(unwrapped);
wpabuf_free(A_pub);
wpabuf_free(B_pub);
wpabuf_free(X_pub);
wpabuf_free(Y_pub);
return msg;
fail:
wpa_printf(MSG_DEBUG,
"DPP: PKEX Commit-Reveal Request processing failed");
goto out;
}
int dpp_pkex_rx_commit_reveal_resp(struct dpp_pkex *pkex, const u8 *hdr,
const u8 *buf, size_t buflen)
{
const struct dpp_curve_params *curve = pkex->own_bi->curve;
const u8 *wrapped_data, *b_key, *peer_v;
u16 wrapped_data_len, b_key_len, peer_v_len = 0;
const u8 *addr[4];
size_t len[4];
u8 octet;
u8 *unwrapped = NULL;
size_t unwrapped_len = 0;
int ret = -1;
u8 v[DPP_MAX_HASH_LEN];
size_t Lx_len;
u8 Lx[DPP_MAX_SHARED_SECRET_LEN];
struct wpabuf *B_pub = NULL, *X_pub = NULL, *Y_pub = NULL;
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_STOP_AT_PKEX_CR_RESP) {
wpa_printf(MSG_INFO,
"DPP: TESTING - stop at PKEX CR Response");
pkex->failed = 1;
goto fail;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (!pkex->exchange_done || pkex->failed ||
pkex->t >= PKEX_COUNTER_T_LIMIT || !pkex->initiator)
goto fail;
wrapped_data = dpp_get_attr(buf, buflen, DPP_ATTR_WRAPPED_DATA,
&wrapped_data_len);
if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
dpp_pkex_fail(pkex,
"Missing or invalid required Wrapped Data attribute");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
wrapped_data, wrapped_data_len);
unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
unwrapped = os_malloc(unwrapped_len);
if (!unwrapped)
goto fail;
addr[0] = hdr;
len[0] = DPP_HDR_LEN;
octet = 1;
addr[1] = &octet;
len[1] = sizeof(octet);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
if (aes_siv_decrypt(pkex->z, curve->hash_len,
wrapped_data, wrapped_data_len,
2, addr, len, unwrapped) < 0) {
dpp_pkex_fail(pkex,
"AES-SIV decryption failed - possible PKEX code mismatch");
pkex->t++;
goto fail;
}
wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
unwrapped, unwrapped_len);
if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
dpp_pkex_fail(pkex, "Invalid attribute in unwrapped data");
goto fail;
}
b_key = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_BOOTSTRAP_KEY,
&b_key_len);
if (!b_key || b_key_len != 2 * curve->prime_len) {
dpp_pkex_fail(pkex, "No valid peer bootstrapping key found");
goto fail;
}
pkex->peer_bootstrap_key = dpp_set_pubkey_point(pkex->x, b_key,
b_key_len);
if (!pkex->peer_bootstrap_key) {
dpp_pkex_fail(pkex, "Peer bootstrapping key is invalid");
goto fail;
}
dpp_debug_print_key("DPP: Peer bootstrap public key",
pkex->peer_bootstrap_key);
/* ECDH: L' = x * B' */
if (dpp_ecdh(pkex->x, pkex->peer_bootstrap_key, Lx, &Lx_len) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (L.x)",
Lx, Lx_len);
/* v' = HMAC(L.x, MAC-Responder | B'.x | X.x | Y'.x) */
B_pub = dpp_get_pubkey_point(pkex->peer_bootstrap_key, 0);
X_pub = dpp_get_pubkey_point(pkex->x, 0);
Y_pub = dpp_get_pubkey_point(pkex->y, 0);
if (!B_pub || !X_pub || !Y_pub)
goto fail;
addr[0] = pkex->peer_mac;
len[0] = ETH_ALEN;
addr[1] = wpabuf_head(B_pub);
len[1] = wpabuf_len(B_pub) / 2;
addr[2] = wpabuf_head(X_pub);
len[2] = wpabuf_len(X_pub) / 2;
addr[3] = wpabuf_head(Y_pub);
len[3] = wpabuf_len(Y_pub) / 2;
if (dpp_hmac_vector(curve->hash_len, Lx, Lx_len, 4, addr, len, v) < 0)
goto fail;
peer_v = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_R_AUTH_TAG,
&peer_v_len);
if (!peer_v || peer_v_len != curve->hash_len ||
os_memcmp(peer_v, v, curve->hash_len) != 0) {
dpp_pkex_fail(pkex, "No valid v (R-Auth tag) found");
wpa_hexdump(MSG_DEBUG, "DPP: Calculated v'",
v, curve->hash_len);
wpa_hexdump(MSG_DEBUG, "DPP: Received v", peer_v, peer_v_len);
pkex->t++;
goto fail;
}
wpa_printf(MSG_DEBUG, "DPP: Valid v (R-Auth tag) received");
ret = 0;
out:
wpabuf_free(B_pub);
wpabuf_free(X_pub);
wpabuf_free(Y_pub);
os_free(unwrapped);
return ret;
fail:
goto out;
}
void dpp_pkex_free(struct dpp_pkex *pkex)
{
if (!pkex)
return;
os_free(pkex->identifier);
os_free(pkex->code);
EVP_PKEY_free(pkex->x);
EVP_PKEY_free(pkex->y);
EVP_PKEY_free(pkex->peer_bootstrap_key);
wpabuf_free(pkex->exchange_req);
wpabuf_free(pkex->exchange_resp);
os_free(pkex);
}
#ifdef CONFIG_TESTING_OPTIONS
char * dpp_corrupt_connector_signature(const char *connector)
{
char *tmp, *pos, *signed3 = NULL;
unsigned char *signature = NULL;
size_t signature_len = 0, signed3_len;
tmp = os_zalloc(os_strlen(connector) + 5);
if (!tmp)
goto fail;
os_memcpy(tmp, connector, os_strlen(connector));
pos = os_strchr(tmp, '.');
if (!pos)
goto fail;
pos = os_strchr(pos + 1, '.');
if (!pos)
goto fail;
pos++;
wpa_printf(MSG_DEBUG, "DPP: Original base64url encoded signature: %s",
pos);
signature = base64_url_decode((const unsigned char *) pos,
os_strlen(pos), &signature_len);
if (!signature || signature_len == 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "DPP: Original Connector signature",
signature, signature_len);
signature[signature_len - 1] ^= 0x01;
wpa_hexdump(MSG_DEBUG, "DPP: Corrupted Connector signature",
signature, signature_len);
signed3 = (char *) base64_url_encode(signature, signature_len,
&signed3_len, 0);
if (!signed3)
goto fail;
os_memcpy(pos, signed3, signed3_len);
pos[signed3_len] = '\0';
wpa_printf(MSG_DEBUG, "DPP: Corrupted base64url encoded signature: %s",
pos);
out:
os_free(signature);
os_free(signed3);
return tmp;
fail:
os_free(tmp);
tmp = NULL;
goto out;
}
#endif /* CONFIG_TESTING_OPTIONS */
#ifdef CONFIG_DPP2
struct dpp_pfs * dpp_pfs_init(const u8 *net_access_key,
size_t net_access_key_len)
{
struct wpabuf *pub = NULL;
EVP_PKEY *own_key;
struct dpp_pfs *pfs;
pfs = os_zalloc(sizeof(*pfs));
if (!pfs)
return NULL;
own_key = dpp_set_keypair(&pfs->curve, net_access_key,
net_access_key_len);
if (!own_key) {
wpa_printf(MSG_ERROR, "DPP: Failed to parse own netAccessKey");
goto fail;
}
EVP_PKEY_free(own_key);
pfs->ecdh = crypto_ecdh_init(pfs->curve->ike_group);
if (!pfs->ecdh)
goto fail;
pub = crypto_ecdh_get_pubkey(pfs->ecdh, 0);
pub = wpabuf_zeropad(pub, pfs->curve->prime_len);
if (!pub)
goto fail;
pfs->ie = wpabuf_alloc(5 + wpabuf_len(pub));
if (!pfs->ie)
goto fail;
wpabuf_put_u8(pfs->ie, WLAN_EID_EXTENSION);
wpabuf_put_u8(pfs->ie, 1 + 2 + wpabuf_len(pub));
wpabuf_put_u8(pfs->ie, WLAN_EID_EXT_OWE_DH_PARAM);
wpabuf_put_le16(pfs->ie, pfs->curve->ike_group);
wpabuf_put_buf(pfs->ie, pub);
wpabuf_free(pub);
wpa_hexdump_buf(MSG_DEBUG, "DPP: Diffie-Hellman Parameter element",
pfs->ie);
return pfs;
fail:
wpabuf_free(pub);
dpp_pfs_free(pfs);
return NULL;
}
int dpp_pfs_process(struct dpp_pfs *pfs, const u8 *peer_ie, size_t peer_ie_len)
{
if (peer_ie_len < 2)
return -1;
if (WPA_GET_LE16(peer_ie) != pfs->curve->ike_group) {
wpa_printf(MSG_DEBUG, "DPP: Peer used different group for PFS");
return -1;
}
pfs->secret = crypto_ecdh_set_peerkey(pfs->ecdh, 0, peer_ie + 2,
peer_ie_len - 2);
pfs->secret = wpabuf_zeropad(pfs->secret, pfs->curve->prime_len);
if (!pfs->secret) {
wpa_printf(MSG_DEBUG, "DPP: Invalid peer DH public key");
return -1;
}
wpa_hexdump_buf_key(MSG_DEBUG, "DPP: DH shared secret", pfs->secret);
return 0;
}
void dpp_pfs_free(struct dpp_pfs *pfs)
{
if (!pfs)
return;
crypto_ecdh_deinit(pfs->ecdh);
wpabuf_free(pfs->ie);
wpabuf_clear_free(pfs->secret);
os_free(pfs);
}
#endif /* CONFIG_DPP2 */
static unsigned int dpp_next_id(struct dpp_global *dpp)
{
struct dpp_bootstrap_info *bi;
unsigned int max_id = 0;
dl_list_for_each(bi, &dpp->bootstrap, struct dpp_bootstrap_info, list) {
if (bi->id > max_id)
max_id = bi->id;
}
return max_id + 1;
}
static int dpp_bootstrap_del(struct dpp_global *dpp, unsigned int id)
{
struct dpp_bootstrap_info *bi, *tmp;
int found = 0;
if (!dpp)
return -1;
dl_list_for_each_safe(bi, tmp, &dpp->bootstrap,
struct dpp_bootstrap_info, list) {
if (id && bi->id != id)
continue;
found = 1;
dl_list_del(&bi->list);
dpp_bootstrap_info_free(bi);
}
if (id == 0)
return 0; /* flush succeeds regardless of entries found */
return found ? 0 : -1;
}
struct dpp_bootstrap_info * dpp_add_qr_code(struct dpp_global *dpp,
const char *uri)
{
struct dpp_bootstrap_info *bi;
if (!dpp)
return NULL;
bi = dpp_parse_qr_code(uri);
if (!bi)
return NULL;
bi->id = dpp_next_id(dpp);
dl_list_add(&dpp->bootstrap, &bi->list);
return bi;
}
int dpp_bootstrap_gen(struct dpp_global *dpp, const char *cmd)
{
char *chan = NULL, *mac = NULL, *info = NULL, *pk = NULL, *curve = NULL;
char *key = NULL;
u8 *privkey = NULL;
size_t privkey_len = 0;
size_t len;
int ret = -1;
struct dpp_bootstrap_info *bi;
if (!dpp)
return -1;
bi = os_zalloc(sizeof(*bi));
if (!bi)
goto fail;
if (os_strstr(cmd, "type=qrcode"))
bi->type = DPP_BOOTSTRAP_QR_CODE;
else if (os_strstr(cmd, "type=pkex"))
bi->type = DPP_BOOTSTRAP_PKEX;
else
goto fail;
chan = get_param(cmd, " chan=");
mac = get_param(cmd, " mac=");
info = get_param(cmd, " info=");
curve = get_param(cmd, " curve=");
key = get_param(cmd, " key=");
if (key) {
privkey_len = os_strlen(key) / 2;
privkey = os_malloc(privkey_len);
if (!privkey ||
hexstr2bin(key, privkey, privkey_len) < 0)
goto fail;
}
pk = dpp_keygen(bi, curve, privkey, privkey_len);
if (!pk)
goto fail;
len = 4; /* "DPP:" */
if (chan) {
if (dpp_parse_uri_chan_list(bi, chan) < 0)
goto fail;
len += 3 + os_strlen(chan); /* C:...; */
}
if (mac) {
if (dpp_parse_uri_mac(bi, mac) < 0)
goto fail;
len += 3 + os_strlen(mac); /* M:...; */
}
if (info) {
if (dpp_parse_uri_info(bi, info) < 0)
goto fail;
len += 3 + os_strlen(info); /* I:...; */
}
len += 4 + os_strlen(pk);
bi->uri = os_malloc(len + 1);
if (!bi->uri)
goto fail;
os_snprintf(bi->uri, len + 1, "DPP:%s%s%s%s%s%s%s%s%sK:%s;;",
chan ? "C:" : "", chan ? chan : "", chan ? ";" : "",
mac ? "M:" : "", mac ? mac : "", mac ? ";" : "",
info ? "I:" : "", info ? info : "", info ? ";" : "",
pk);
bi->id = dpp_next_id(dpp);
dl_list_add(&dpp->bootstrap, &bi->list);
ret = bi->id;
bi = NULL;
fail:
os_free(curve);
os_free(pk);
os_free(chan);
os_free(mac);
os_free(info);
str_clear_free(key);
bin_clear_free(privkey, privkey_len);
dpp_bootstrap_info_free(bi);
return ret;
}
struct dpp_bootstrap_info *
dpp_bootstrap_get_id(struct dpp_global *dpp, unsigned int id)
{
struct dpp_bootstrap_info *bi;
if (!dpp)
return NULL;
dl_list_for_each(bi, &dpp->bootstrap, struct dpp_bootstrap_info, list) {
if (bi->id == id)
return bi;
}
return NULL;
}
int dpp_bootstrap_remove(struct dpp_global *dpp, const char *id)
{
unsigned int id_val;
if (os_strcmp(id, "*") == 0) {
id_val = 0;
} else {
id_val = atoi(id);
if (id_val == 0)
return -1;
}
return dpp_bootstrap_del(dpp, id_val);
}
struct dpp_bootstrap_info *
dpp_pkex_finish(struct dpp_global *dpp, struct dpp_pkex *pkex, const u8 *peer,
unsigned int freq)
{
struct dpp_bootstrap_info *bi;
bi = os_zalloc(sizeof(*bi));
if (!bi)
return NULL;
bi->id = dpp_next_id(dpp);
bi->type = DPP_BOOTSTRAP_PKEX;
os_memcpy(bi->mac_addr, peer, ETH_ALEN);
bi->num_freq = 1;
bi->freq[0] = freq;
bi->curve = pkex->own_bi->curve;
bi->pubkey = pkex->peer_bootstrap_key;
pkex->peer_bootstrap_key = NULL;
if (dpp_bootstrap_key_hash(bi) < 0) {
dpp_bootstrap_info_free(bi);
return NULL;
}
dpp_pkex_free(pkex);
dl_list_add(&dpp->bootstrap, &bi->list);
return bi;
}
const char * dpp_bootstrap_get_uri(struct dpp_global *dpp, unsigned int id)
{
struct dpp_bootstrap_info *bi;
bi = dpp_bootstrap_get_id(dpp, id);
if (!bi)
return NULL;
return bi->uri;
}
int dpp_bootstrap_info(struct dpp_global *dpp, int id,
char *reply, int reply_size)
{
struct dpp_bootstrap_info *bi;
char pkhash[2 * SHA256_MAC_LEN + 1];
bi = dpp_bootstrap_get_id(dpp, id);
if (!bi)
return -1;
wpa_snprintf_hex(pkhash, sizeof(pkhash), bi->pubkey_hash,
SHA256_MAC_LEN);
return os_snprintf(reply, reply_size, "type=%s\n"
"mac_addr=" MACSTR "\n"
"info=%s\n"
"num_freq=%u\n"
"curve=%s\n"
"pkhash=%s\n",
dpp_bootstrap_type_txt(bi->type),
MAC2STR(bi->mac_addr),
bi->info ? bi->info : "",
bi->num_freq,
bi->curve->name,
pkhash);
}
void dpp_bootstrap_find_pair(struct dpp_global *dpp, const u8 *i_bootstrap,
const u8 *r_bootstrap,
struct dpp_bootstrap_info **own_bi,
struct dpp_bootstrap_info **peer_bi)
{
struct dpp_bootstrap_info *bi;
*own_bi = NULL;
*peer_bi = NULL;
if (!dpp)
return;
dl_list_for_each(bi, &dpp->bootstrap, struct dpp_bootstrap_info, list) {
if (!*own_bi && bi->own &&
os_memcmp(bi->pubkey_hash, r_bootstrap,
SHA256_MAC_LEN) == 0) {
wpa_printf(MSG_DEBUG,
"DPP: Found matching own bootstrapping information");
*own_bi = bi;
}
if (!*peer_bi && !bi->own &&
os_memcmp(bi->pubkey_hash, i_bootstrap,
SHA256_MAC_LEN) == 0) {
wpa_printf(MSG_DEBUG,
"DPP: Found matching peer bootstrapping information");
*peer_bi = bi;
}
if (*own_bi && *peer_bi)
break;
}
}
static unsigned int dpp_next_configurator_id(struct dpp_global *dpp)
{
struct dpp_configurator *conf;
unsigned int max_id = 0;
dl_list_for_each(conf, &dpp->configurator, struct dpp_configurator,
list) {
if (conf->id > max_id)
max_id = conf->id;
}
return max_id + 1;
}
int dpp_configurator_add(struct dpp_global *dpp, const char *cmd)
{
char *curve = NULL;
char *key = NULL;
u8 *privkey = NULL;
size_t privkey_len = 0;
int ret = -1;
struct dpp_configurator *conf = NULL;
curve = get_param(cmd, " curve=");
key = get_param(cmd, " key=");
if (key) {
privkey_len = os_strlen(key) / 2;
privkey = os_malloc(privkey_len);
if (!privkey ||
hexstr2bin(key, privkey, privkey_len) < 0)
goto fail;
}
conf = dpp_keygen_configurator(curve, privkey, privkey_len);
if (!conf)
goto fail;
conf->id = dpp_next_configurator_id(dpp);
dl_list_add(&dpp->configurator, &conf->list);
ret = conf->id;
conf = NULL;
fail:
os_free(curve);
str_clear_free(key);
bin_clear_free(privkey, privkey_len);
dpp_configurator_free(conf);
return ret;
}
static int dpp_configurator_del(struct dpp_global *dpp, unsigned int id)
{
struct dpp_configurator *conf, *tmp;
int found = 0;
if (!dpp)
return -1;
dl_list_for_each_safe(conf, tmp, &dpp->configurator,
struct dpp_configurator, list) {
if (id && conf->id != id)
continue;
found = 1;
dl_list_del(&conf->list);
dpp_configurator_free(conf);
}
if (id == 0)
return 0; /* flush succeeds regardless of entries found */
return found ? 0 : -1;
}
int dpp_configurator_remove(struct dpp_global *dpp, const char *id)
{
unsigned int id_val;
if (os_strcmp(id, "*") == 0) {
id_val = 0;
} else {
id_val = atoi(id);
if (id_val == 0)
return -1;
}
return dpp_configurator_del(dpp, id_val);
}
int dpp_configurator_get_key_id(struct dpp_global *dpp, unsigned int id,
char *buf, size_t buflen)
{
struct dpp_configurator *conf;
conf = dpp_configurator_get_id(dpp, id);
if (!conf)
return -1;
return dpp_configurator_get_key(conf, buf, buflen);
}
#ifdef CONFIG_DPP2
static void dpp_controller_conn_status_result_wait_timeout(void *eloop_ctx,
void *timeout_ctx);
static void dpp_connection_free(struct dpp_connection *conn)
{
if (conn->sock >= 0) {
wpa_printf(MSG_DEBUG, "DPP: Close Controller socket %d",
conn->sock);
eloop_unregister_sock(conn->sock, EVENT_TYPE_READ);
eloop_unregister_sock(conn->sock, EVENT_TYPE_WRITE);
close(conn->sock);
}
eloop_cancel_timeout(dpp_controller_conn_status_result_wait_timeout,
conn, NULL);
wpabuf_free(conn->msg);
wpabuf_free(conn->msg_out);
dpp_auth_deinit(conn->auth);
os_free(conn);
}
static void dpp_connection_remove(struct dpp_connection *conn)
{
dl_list_del(&conn->list);
dpp_connection_free(conn);
}
static void dpp_tcp_init_flush(struct dpp_global *dpp)
{
struct dpp_connection *conn, *tmp;
dl_list_for_each_safe(conn, tmp, &dpp->tcp_init, struct dpp_connection,
list)
dpp_connection_remove(conn);
}
static void dpp_relay_controller_free(struct dpp_relay_controller *ctrl)
{
struct dpp_connection *conn, *tmp;
dl_list_for_each_safe(conn, tmp, &ctrl->conn, struct dpp_connection,
list)
dpp_connection_remove(conn);
os_free(ctrl);
}
static void dpp_relay_flush_controllers(struct dpp_global *dpp)
{
struct dpp_relay_controller *ctrl, *tmp;
if (!dpp)
return;
dl_list_for_each_safe(ctrl, tmp, &dpp->controllers,
struct dpp_relay_controller, list) {
dl_list_del(&ctrl->list);
dpp_relay_controller_free(ctrl);
}
}
#endif /* CONFIG_DPP2 */
struct dpp_global * dpp_global_init(struct dpp_global_config *config)
{
struct dpp_global *dpp;
dpp = os_zalloc(sizeof(*dpp));
if (!dpp)
return NULL;
dpp->msg_ctx = config->msg_ctx;
#ifdef CONFIG_DPP2
dpp->cb_ctx = config->cb_ctx;
dpp->process_conf_obj = config->process_conf_obj;
#endif /* CONFIG_DPP2 */
dl_list_init(&dpp->bootstrap);
dl_list_init(&dpp->configurator);
#ifdef CONFIG_DPP2
dl_list_init(&dpp->controllers);
dl_list_init(&dpp->tcp_init);
#endif /* CONFIG_DPP2 */
return dpp;
}
void dpp_global_clear(struct dpp_global *dpp)
{
if (!dpp)
return;
dpp_bootstrap_del(dpp, 0);
dpp_configurator_del(dpp, 0);
#ifdef CONFIG_DPP2
dpp_tcp_init_flush(dpp);
dpp_relay_flush_controllers(dpp);
dpp_controller_stop(dpp);
#endif /* CONFIG_DPP2 */
}
void dpp_global_deinit(struct dpp_global *dpp)
{
dpp_global_clear(dpp);
os_free(dpp);
}
#ifdef CONFIG_DPP2
static void dpp_controller_rx(int sd, void *eloop_ctx, void *sock_ctx);
static void dpp_conn_tx_ready(int sock, void *eloop_ctx, void *sock_ctx);
static void dpp_controller_auth_success(struct dpp_connection *conn,
int initiator);
int dpp_relay_add_controller(struct dpp_global *dpp,
struct dpp_relay_config *config)
{
struct dpp_relay_controller *ctrl;
if (!dpp)
return -1;
ctrl = os_zalloc(sizeof(*ctrl));
if (!ctrl)
return -1;
dl_list_init(&ctrl->conn);
ctrl->global = dpp;
os_memcpy(&ctrl->ipaddr, config->ipaddr, sizeof(*config->ipaddr));
os_memcpy(ctrl->pkhash, config->pkhash, SHA256_MAC_LEN);
ctrl->cb_ctx = config->cb_ctx;
ctrl->tx = config->tx;
ctrl->gas_resp_tx = config->gas_resp_tx;
dl_list_add(&dpp->controllers, &ctrl->list);
return 0;
}
static struct dpp_relay_controller *
dpp_relay_controller_get(struct dpp_global *dpp, const u8 *pkhash)
{
struct dpp_relay_controller *ctrl;
if (!dpp)
return NULL;
dl_list_for_each(ctrl, &dpp->controllers, struct dpp_relay_controller,
list) {
if (os_memcmp(pkhash, ctrl->pkhash, SHA256_MAC_LEN) == 0)
return ctrl;
}
return NULL;
}
static void dpp_controller_gas_done(struct dpp_connection *conn)
{
struct dpp_authentication *auth = conn->auth;
if (auth->peer_version >= 2 &&
auth->conf_resp_status == DPP_STATUS_OK) {
wpa_printf(MSG_DEBUG, "DPP: Wait for Configuration Result");
auth->waiting_conf_result = 1;
return;
}
wpa_msg(conn->ctrl->global->msg_ctx, MSG_INFO, DPP_EVENT_CONF_SENT);
dpp_connection_remove(conn);
}
static int dpp_tcp_send(struct dpp_connection *conn)
{
int res;
if (!conn->msg_out) {
eloop_unregister_sock(conn->sock, EVENT_TYPE_WRITE);
conn->write_eloop = 0;
return -1;
}
res = send(conn->sock,
wpabuf_head_u8(conn->msg_out) + conn->msg_out_pos,
wpabuf_len(conn->msg_out) - conn->msg_out_pos, 0);
if (res < 0) {
wpa_printf(MSG_DEBUG, "DPP: Failed to send buffer: %s",
strerror(errno));
dpp_connection_remove(conn);
return -1;
}
conn->msg_out_pos += res;
if (wpabuf_len(conn->msg_out) > conn->msg_out_pos) {
wpa_printf(MSG_DEBUG,
"DPP: %u/%u bytes of message sent to Controller",
(unsigned int) conn->msg_out_pos,
(unsigned int) wpabuf_len(conn->msg_out));
if (!conn->write_eloop &&
eloop_register_sock(conn->sock, EVENT_TYPE_WRITE,
dpp_conn_tx_ready, conn, NULL) == 0)
conn->write_eloop = 1;
return 1;
}
wpa_printf(MSG_DEBUG, "DPP: Full message sent over TCP");
wpabuf_free(conn->msg_out);
conn->msg_out = NULL;
conn->msg_out_pos = 0;
eloop_unregister_sock(conn->sock, EVENT_TYPE_WRITE);
conn->write_eloop = 0;
if (!conn->read_eloop &&
eloop_register_sock(conn->sock, EVENT_TYPE_READ,
dpp_controller_rx, conn, NULL) == 0)
conn->read_eloop = 1;
if (conn->on_tcp_tx_complete_remove) {
dpp_connection_remove(conn);
} else if (conn->ctrl && conn->on_tcp_tx_complete_gas_done &&
conn->auth) {
dpp_controller_gas_done(conn);
} else if (conn->on_tcp_tx_complete_auth_ok) {
conn->on_tcp_tx_complete_auth_ok = 0;
dpp_controller_auth_success(conn, 1);
}
return 0;
}
static void dpp_controller_start_gas_client(struct dpp_connection *conn)
{
struct dpp_authentication *auth = conn->auth;
struct wpabuf *buf;
int netrole_ap = 0; /* TODO: make this configurable */
buf = dpp_build_conf_req_helper(auth, "Test", netrole_ap, NULL, NULL);
if (!buf) {
wpa_printf(MSG_DEBUG,
"DPP: No configuration request data available");
return;
}
wpabuf_free(conn->msg_out);
conn->msg_out_pos = 0;
conn->msg_out = wpabuf_alloc(4 + wpabuf_len(buf) - 1);
if (!conn->msg_out) {
wpabuf_free(buf);
return;
}
wpabuf_put_be32(conn->msg_out, wpabuf_len(buf) - 1);
wpabuf_put_data(conn->msg_out, wpabuf_head_u8(buf) + 1,
wpabuf_len(buf) - 1);
wpabuf_free(buf);
if (dpp_tcp_send(conn) == 1) {
if (!conn->write_eloop) {
if (eloop_register_sock(conn->sock, EVENT_TYPE_WRITE,
dpp_conn_tx_ready,
conn, NULL) < 0)
return;
conn->write_eloop = 1;
}
}
}
static void dpp_controller_auth_success(struct dpp_connection *conn,
int initiator)
{
struct dpp_authentication *auth = conn->auth;
if (!auth)
return;
wpa_printf(MSG_DEBUG, "DPP: Authentication succeeded");
wpa_msg(conn->global->msg_ctx, MSG_INFO,
DPP_EVENT_AUTH_SUCCESS "init=%d", initiator);
#ifdef CONFIG_TESTING_OPTIONS
if (dpp_test == DPP_TEST_STOP_AT_AUTH_CONF) {
wpa_printf(MSG_INFO,
"DPP: TESTING - stop at Authentication Confirm");
if (auth->configurator) {
/* Prevent GAS response */
auth->auth_success = 0;
}
return;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (!auth->configurator)
dpp_controller_start_gas_client(conn);
}
static void dpp_conn_tx_ready(int sock, void *eloop_ctx, void *sock_ctx)
{
struct dpp_connection *conn = eloop_ctx;
wpa_printf(MSG_DEBUG, "DPP: TCP socket %d ready for TX", sock);
dpp_tcp_send(conn);
}
static int dpp_ipaddr_to_sockaddr(struct sockaddr *addr, socklen_t *addrlen,
const struct hostapd_ip_addr *ipaddr,
int port)
{
struct sockaddr_in *dst;
#ifdef CONFIG_IPV6
struct sockaddr_in6 *dst6;
#endif /* CONFIG_IPV6 */
switch (ipaddr->af) {
case AF_INET:
dst = (struct sockaddr_in *) addr;
os_memset(dst, 0, sizeof(*dst));
dst->sin_family = AF_INET;
dst->sin_addr.s_addr = ipaddr->u.v4.s_addr;
dst->sin_port = htons(port);
*addrlen = sizeof(*dst);
break;
#ifdef CONFIG_IPV6
case AF_INET6:
dst6 = (struct sockaddr_in6 *) addr;
os_memset(dst6, 0, sizeof(*dst6));
dst6->sin6_family = AF_INET6;
os_memcpy(&dst6->sin6_addr, &ipaddr->u.v6,
sizeof(struct in6_addr));
dst6->sin6_port = htons(port);
*addrlen = sizeof(*dst6);
break;
#endif /* CONFIG_IPV6 */
default:
return -1;
}
return 0;
}
static struct dpp_connection *
dpp_relay_new_conn(struct dpp_relay_controller *ctrl, const u8 *src,
unsigned int freq)
{
struct dpp_connection *conn;
struct sockaddr_storage addr;
socklen_t addrlen;
char txt[100];
if (dl_list_len(&ctrl->conn) >= 15) {
wpa_printf(MSG_DEBUG,
"DPP: Too many ongoing Relay connections to the Controller - cannot start a new one");
return NULL;
}
if (dpp_ipaddr_to_sockaddr((struct sockaddr *) &addr, &addrlen,
&ctrl->ipaddr, DPP_TCP_PORT) < 0)
return NULL;
conn = os_zalloc(sizeof(*conn));
if (!conn)
return NULL;
conn->global = ctrl->global;
conn->relay = ctrl;
os_memcpy(conn->mac_addr, src, ETH_ALEN);
conn->freq = freq;
conn->sock = socket(AF_INET, SOCK_STREAM, 0);
if (conn->sock < 0)
goto fail;
wpa_printf(MSG_DEBUG, "DPP: TCP relay socket %d connection to %s",
conn->sock, hostapd_ip_txt(&ctrl->ipaddr, txt, sizeof(txt)));
if (fcntl(conn->sock, F_SETFL, O_NONBLOCK) != 0) {
wpa_printf(MSG_DEBUG, "DPP: fnctl(O_NONBLOCK) failed: %s",
strerror(errno));
goto fail;
}
if (connect(conn->sock, (struct sockaddr *) &addr, addrlen) < 0) {
if (errno != EINPROGRESS) {
wpa_printf(MSG_DEBUG, "DPP: Failed to connect: %s",
strerror(errno));
goto fail;
}
/*
* Continue connecting in the background; eloop will call us
* once the connection is ready (or failed).
*/
}
if (eloop_register_sock(conn->sock, EVENT_TYPE_WRITE,
dpp_conn_tx_ready, conn, NULL) < 0)
goto fail;
conn->write_eloop = 1;
/* TODO: eloop timeout to clear a connection if it does not complete
* properly */
dl_list_add(&ctrl->conn, &conn->list);
return conn;
fail:
dpp_connection_free(conn);
return NULL;
}
static struct wpabuf * dpp_tcp_encaps(const u8 *hdr, const u8 *buf, size_t len)
{
struct wpabuf *msg;
msg = wpabuf_alloc(4 + 1 + DPP_HDR_LEN + len);
if (!msg)
return NULL;
wpabuf_put_be32(msg, 1 + DPP_HDR_LEN + len);
wpabuf_put_u8(msg, WLAN_PA_VENDOR_SPECIFIC);
wpabuf_put_data(msg, hdr, DPP_HDR_LEN);
wpabuf_put_data(msg, buf, len);
wpa_hexdump_buf(MSG_MSGDUMP, "DPP: Outgoing TCP message", msg);
return msg;
}
static int dpp_relay_tx(struct dpp_connection *conn, const u8 *hdr,
const u8 *buf, size_t len)
{
u8 type = hdr[DPP_HDR_LEN - 1];
wpa_printf(MSG_DEBUG,
"DPP: Continue already established Relay/Controller connection for this session");
wpabuf_free(conn->msg_out);
conn->msg_out_pos = 0;
conn->msg_out = dpp_tcp_encaps(hdr, buf, len);
if (!conn->msg_out) {
dpp_connection_remove(conn);
return -1;
}
/* TODO: for proto ver 1, need to do remove connection based on GAS Resp
* TX status */
if (type == DPP_PA_CONFIGURATION_RESULT)
conn->on_tcp_tx_complete_remove = 1;
dpp_tcp_send(conn);
return 0;
}
int dpp_relay_rx_action(struct dpp_global *dpp, const u8 *src, const u8 *hdr,
const u8 *buf, size_t len, unsigned int freq,
const u8 *i_bootstrap, const u8 *r_bootstrap)
{
struct dpp_relay_controller *ctrl;
struct dpp_connection *conn;
u8 type = hdr[DPP_HDR_LEN - 1];
/* Check if there is an already started session for this peer and if so,
* continue that session (send this over TCP) and return 0.
*/
if (type != DPP_PA_PEER_DISCOVERY_REQ &&
type != DPP_PA_PEER_DISCOVERY_RESP) {
dl_list_for_each(ctrl, &dpp->controllers,
struct dpp_relay_controller, list) {
dl_list_for_each(conn, &ctrl->conn,
struct dpp_connection, list) {
if (os_memcmp(src, conn->mac_addr,
ETH_ALEN) == 0)
return dpp_relay_tx(conn, hdr, buf, len);
}
}
}
if (!r_bootstrap)
return -1;
ctrl = dpp_relay_controller_get(dpp, r_bootstrap);
if (!ctrl)
return -1;
wpa_printf(MSG_DEBUG,
"DPP: Authentication Request for a configured Controller");
conn = dpp_relay_new_conn(ctrl, src, freq);
if (!conn)
return -1;
conn->msg_out = dpp_tcp_encaps(hdr, buf, len);
if (!conn->msg_out) {
dpp_connection_remove(conn);
return -1;
}
/* Message will be sent in dpp_conn_tx_ready() */
return 0;
}
int dpp_relay_rx_gas_req(struct dpp_global *dpp, const u8 *src, const u8 *data,
size_t data_len)
{
struct dpp_relay_controller *ctrl;
struct dpp_connection *conn, *found = NULL;
struct wpabuf *msg;
/* Check if there is a successfully completed authentication for this
* and if so, continue that session (send this over TCP) and return 0.
*/
dl_list_for_each(ctrl, &dpp->controllers,
struct dpp_relay_controller, list) {
if (found)
break;
dl_list_for_each(conn, &ctrl->conn,
struct dpp_connection, list) {
if (os_memcmp(src, conn->mac_addr,
ETH_ALEN) == 0) {
found = conn;
break;
}
}
}
if (!found)
return -1;
msg = wpabuf_alloc(4 + 1 + data_len);
if (!msg)
return -1;
wpabuf_put_be32(msg, 1 + data_len);
wpabuf_put_u8(msg, WLAN_PA_GAS_INITIAL_REQ);
wpabuf_put_data(msg, data, data_len);
wpa_hexdump_buf(MSG_MSGDUMP, "DPP: Outgoing TCP message", msg);
wpabuf_free(conn->msg_out);
conn->msg_out_pos = 0;
conn->msg_out = msg;
dpp_tcp_send(conn);
return 0;
}
static void dpp_controller_free(struct dpp_controller *ctrl)
{
struct dpp_connection *conn, *tmp;
if (!ctrl)
return;
dl_list_for_each_safe(conn, tmp, &ctrl->conn, struct dpp_connection,
list)
dpp_connection_remove(conn);
if (ctrl->sock >= 0) {
close(ctrl->sock);
eloop_unregister_sock(ctrl->sock, EVENT_TYPE_READ);
}
os_free(ctrl->configurator_params);
os_free(ctrl);
}
static int dpp_controller_rx_auth_req(struct dpp_connection *conn,
const u8 *hdr, const u8 *buf, size_t len)
{
const u8 *r_bootstrap, *i_bootstrap;
u16 r_bootstrap_len, i_bootstrap_len;
struct dpp_bootstrap_info *own_bi = NULL, *peer_bi = NULL;
if (!conn->ctrl)
return 0;
wpa_printf(MSG_DEBUG, "DPP: Authentication Request");
r_bootstrap = dpp_get_attr(buf, len, DPP_ATTR_R_BOOTSTRAP_KEY_HASH,
&r_bootstrap_len);
if (!r_bootstrap || r_bootstrap_len != SHA256_MAC_LEN) {
wpa_printf(MSG_INFO,
"Missing or invalid required Responder Bootstrapping Key Hash attribute");
return -1;
}
wpa_hexdump(MSG_MSGDUMP, "DPP: Responder Bootstrapping Key Hash",
r_bootstrap, r_bootstrap_len);
i_bootstrap = dpp_get_attr(buf, len, DPP_ATTR_I_BOOTSTRAP_KEY_HASH,
&i_bootstrap_len);
if (!i_bootstrap || i_bootstrap_len != SHA256_MAC_LEN) {
wpa_printf(MSG_INFO,
"Missing or invalid required Initiator Bootstrapping Key Hash attribute");
return -1;
}
wpa_hexdump(MSG_MSGDUMP, "DPP: Initiator Bootstrapping Key Hash",
i_bootstrap, i_bootstrap_len);
/* Try to find own and peer bootstrapping key matches based on the
* received hash values */
dpp_bootstrap_find_pair(conn->ctrl->global, i_bootstrap, r_bootstrap,
&own_bi, &peer_bi);
if (!own_bi) {
wpa_printf(MSG_INFO,
"No matching own bootstrapping key found - ignore message");
return -1;
}
if (conn->auth) {
wpa_printf(MSG_INFO,
"Already in DPP authentication exchange - ignore new one");
return 0;
}
conn->auth = dpp_auth_req_rx(conn->ctrl->global->msg_ctx,
conn->ctrl->allowed_roles,
conn->ctrl->qr_mutual,
peer_bi, own_bi, -1, hdr, buf, len);
if (!conn->auth) {
wpa_printf(MSG_DEBUG, "DPP: No response generated");
return -1;
}
if (dpp_set_configurator(conn->ctrl->global, conn->ctrl->global->msg_ctx,
conn->auth,
conn->ctrl->configurator_params) < 0) {
dpp_connection_remove(conn);
return -1;
}
wpabuf_free(conn->msg_out);
conn->msg_out_pos = 0;
conn->msg_out = wpabuf_alloc(4 + wpabuf_len(conn->auth->resp_msg) - 1);
if (!conn->msg_out)
return -1;
wpabuf_put_be32(conn->msg_out, wpabuf_len(conn->auth->resp_msg) - 1);
wpabuf_put_data(conn->msg_out, wpabuf_head_u8(conn->auth->resp_msg) + 1,
wpabuf_len(conn->auth->resp_msg) - 1);
if (dpp_tcp_send(conn) == 1) {
if (!conn->write_eloop) {
if (eloop_register_sock(conn->sock, EVENT_TYPE_WRITE,
dpp_conn_tx_ready,
conn, NULL) < 0)
return -1;
conn->write_eloop = 1;
}
}
return 0;
}
static int dpp_controller_rx_auth_resp(struct dpp_connection *conn,
const u8 *hdr, const u8 *buf, size_t len)
{
struct dpp_authentication *auth = conn->auth;
struct wpabuf *msg;
if (!auth)
return -1;
wpa_printf(MSG_DEBUG, "DPP: Authentication Response");
msg = dpp_auth_resp_rx(auth, hdr, buf, len);
if (!msg) {
if (auth->auth_resp_status == DPP_STATUS_RESPONSE_PENDING) {
wpa_printf(MSG_DEBUG,
"DPP: Start wait for full response");
return -1;
}
wpa_printf(MSG_DEBUG, "DPP: No confirm generated");
dpp_connection_remove(conn);
return -1;
}
wpabuf_free(conn->msg_out);
conn->msg_out_pos = 0;
conn->msg_out = wpabuf_alloc(4 + wpabuf_len(msg) - 1);
if (!conn->msg_out) {
wpabuf_free(msg);
return -1;
}
wpabuf_put_be32(conn->msg_out, wpabuf_len(msg) - 1);
wpabuf_put_data(conn->msg_out, wpabuf_head_u8(msg) + 1,
wpabuf_len(msg) - 1);
wpabuf_free(msg);
conn->on_tcp_tx_complete_auth_ok = 1;
if (dpp_tcp_send(conn) == 1) {
if (!conn->write_eloop) {
if (eloop_register_sock(conn->sock, EVENT_TYPE_WRITE,
dpp_conn_tx_ready,
conn, NULL) < 0)
return -1;
conn->write_eloop = 1;
}
}
return 0;
}
static int dpp_controller_rx_auth_conf(struct dpp_connection *conn,
const u8 *hdr, const u8 *buf, size_t len)
{
struct dpp_authentication *auth = conn->auth;
wpa_printf(MSG_DEBUG, "DPP: Authentication Confirmation");
if (!auth) {
wpa_printf(MSG_DEBUG,
"DPP: No DPP Authentication in progress - drop");
return -1;
}
if (dpp_auth_conf_rx(auth, hdr, buf, len) < 0) {
wpa_printf(MSG_DEBUG, "DPP: Authentication failed");
return -1;
}
dpp_controller_auth_success(conn, 0);
return 0;
}
static void dpp_controller_conn_status_result_wait_timeout(void *eloop_ctx,
void *timeout_ctx)
{
struct dpp_connection *conn = eloop_ctx;
if (!conn->auth->waiting_conf_result)
return;
wpa_printf(MSG_DEBUG,
"DPP: Timeout while waiting for Connection Status Result");
wpa_msg(conn->ctrl->global->msg_ctx, MSG_INFO,
DPP_EVENT_CONN_STATUS_RESULT "timeout");
dpp_connection_remove(conn);
}
static int dpp_controller_rx_conf_result(struct dpp_connection *conn,
const u8 *hdr, const u8 *buf,
size_t len)
{
struct dpp_authentication *auth = conn->auth;
enum dpp_status_error status;
if (!conn->ctrl)
return 0;
wpa_printf(MSG_DEBUG, "DPP: Configuration Result");
if (!auth || !auth->waiting_conf_result) {
wpa_printf(MSG_DEBUG,
"DPP: No DPP Configuration waiting for result - drop");
return -1;
}
status = dpp_conf_result_rx(auth, hdr, buf, len);
if (status == DPP_STATUS_OK && auth->send_conn_status) {
wpa_msg(conn->ctrl->global->msg_ctx, MSG_INFO,
DPP_EVENT_CONF_SENT "wait_conn_status=1");
wpa_printf(MSG_DEBUG, "DPP: Wait for Connection Status Result");
eloop_cancel_timeout(
dpp_controller_conn_status_result_wait_timeout,
conn, NULL);
eloop_register_timeout(
16, 0, dpp_controller_conn_status_result_wait_timeout,
conn, NULL);
return 0;
}
if (status == DPP_STATUS_OK)
wpa_msg(conn->ctrl->global->msg_ctx, MSG_INFO,
DPP_EVENT_CONF_SENT);
else
wpa_msg(conn->ctrl->global->msg_ctx, MSG_INFO,
DPP_EVENT_CONF_FAILED);
return -1; /* to remove the completed connection */
}
static int dpp_controller_rx_conn_status_result(struct dpp_connection *conn,
const u8 *hdr, const u8 *buf,
size_t len)
{
struct dpp_authentication *auth = conn->auth;
enum dpp_status_error status;
u8 ssid[SSID_MAX_LEN];
size_t ssid_len = 0;
char *channel_list = NULL;
if (!conn->ctrl)
return 0;
wpa_printf(MSG_DEBUG, "DPP: Connection Status Result");
if (!auth || !auth->waiting_conn_status_result) {
wpa_printf(MSG_DEBUG,
"DPP: No DPP Configuration waiting for connection status result - drop");
return -1;
}
status = dpp_conn_status_result_rx(auth, hdr, buf, len,
ssid, &ssid_len, &channel_list);
wpa_msg(conn->ctrl->global->msg_ctx, MSG_INFO,
DPP_EVENT_CONN_STATUS_RESULT
"result=%d ssid=%s channel_list=%s",
status, wpa_ssid_txt(ssid, ssid_len),
channel_list ? channel_list : "N/A");
os_free(channel_list);
return -1; /* to remove the completed connection */
}
static int dpp_controller_rx_action(struct dpp_connection *conn, const u8 *msg,
size_t len)
{
const u8 *pos, *end;
u8 type;
wpa_printf(MSG_DEBUG, "DPP: Received DPP Action frame over TCP");
pos = msg;
end = msg + len;
if (end - pos < DPP_HDR_LEN ||
WPA_GET_BE24(pos) != OUI_WFA ||
pos[3] != DPP_OUI_TYPE) {
wpa_printf(MSG_DEBUG, "DPP: Unrecognized header");
return -1;
}
if (pos[4] != 1) {
wpa_printf(MSG_DEBUG, "DPP: Unsupported Crypto Suite %u",
pos[4]);
return -1;
}
type = pos[5];
wpa_printf(MSG_DEBUG, "DPP: Received message type %u", type);
pos += DPP_HDR_LEN;
wpa_hexdump(MSG_MSGDUMP, "DPP: Received message attributes",
pos, end - pos);
if (dpp_check_attrs(pos, end - pos) < 0)
return -1;
if (conn->relay) {
wpa_printf(MSG_DEBUG, "DPP: Relay - send over WLAN");
conn->relay->tx(conn->relay->cb_ctx, conn->mac_addr,
conn->freq, msg, len);
return 0;
}
switch (type) {
case DPP_PA_AUTHENTICATION_REQ:
return dpp_controller_rx_auth_req(conn, msg, pos, end - pos);
case DPP_PA_AUTHENTICATION_RESP:
return dpp_controller_rx_auth_resp(conn, msg, pos, end - pos);
case DPP_PA_AUTHENTICATION_CONF:
return dpp_controller_rx_auth_conf(conn, msg, pos, end - pos);
case DPP_PA_CONFIGURATION_RESULT:
return dpp_controller_rx_conf_result(conn, msg, pos, end - pos);
case DPP_PA_CONNECTION_STATUS_RESULT:
return dpp_controller_rx_conn_status_result(conn, msg, pos,
end - pos);
default:
/* TODO: missing messages types */
wpa_printf(MSG_DEBUG,
"DPP: Unsupported frame subtype %d", type);
return -1;
}
}
static int dpp_controller_rx_gas_req(struct dpp_connection *conn, const u8 *msg,
size_t len)
{
const u8 *pos, *end, *next;
u8 dialog_token;
const u8 *adv_proto;
u16 slen;
struct wpabuf *resp, *buf;
struct dpp_authentication *auth = conn->auth;
if (len < 1 + 2)
return -1;
wpa_printf(MSG_DEBUG,
"DPP: Received DPP Configuration Request over TCP");
if (!conn->ctrl || !auth || !auth->auth_success) {
wpa_printf(MSG_DEBUG, "DPP: No matching exchange in progress");
return -1;
}
pos = msg;
end = msg + len;
dialog_token = *pos++;
adv_proto = pos++;
slen = *pos++;
if (*adv_proto != WLAN_EID_ADV_PROTO ||
slen > end - pos || slen < 2)
return -1;
next = pos + slen;
pos++; /* skip QueryRespLenLimit and PAME-BI */
if (slen != 8 || *pos != WLAN_EID_VENDOR_SPECIFIC ||
pos[1] != 5 || WPA_GET_BE24(&pos[2]) != OUI_WFA ||
pos[5] != DPP_OUI_TYPE || pos[6] != 0x01)
return -1;
pos = next;
/* Query Request */
if (end - pos < 2)
return -1;
slen = WPA_GET_LE16(pos);
pos += 2;
if (slen > end - pos)
return -1;
resp = dpp_conf_req_rx(auth, pos, slen);
if (!resp)
return -1;
buf = wpabuf_alloc(4 + 18 + wpabuf_len(resp));
if (!buf) {
wpabuf_free(resp);
return -1;
}
wpabuf_put_be32(buf, 18 + wpabuf_len(resp));
wpabuf_put_u8(buf, WLAN_PA_GAS_INITIAL_RESP);
wpabuf_put_u8(buf, dialog_token);
wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS);
wpabuf_put_le16(buf, 0); /* GAS Comeback Delay */
dpp_write_adv_proto(buf);
dpp_write_gas_query(buf, resp);
wpabuf_free(resp);
/* Send Config Response over TCP; GAS fragmentation is taken care of by
* the Relay */
wpa_hexdump_buf(MSG_MSGDUMP, "DPP: Outgoing TCP message", buf);
wpabuf_free(conn->msg_out);
conn->msg_out_pos = 0;
conn->msg_out = buf;
conn->on_tcp_tx_complete_gas_done = 1;
dpp_tcp_send(conn);
return 0;
}
static int dpp_tcp_rx_gas_resp(struct dpp_connection *conn, struct wpabuf *resp)
{
struct dpp_authentication *auth = conn->auth;
int res;
struct wpabuf *msg, *encaps;
enum dpp_status_error status;
wpa_printf(MSG_DEBUG,
"DPP: Configuration Response for local stack from TCP");
res = dpp_conf_resp_rx(auth, resp);
wpabuf_free(resp);
if (res < 0) {
wpa_printf(MSG_DEBUG, "DPP: Configuration attempt failed");
return -1;
}
if (conn->global->process_conf_obj)
res = conn->global->process_conf_obj(conn->global->cb_ctx,
auth);
else
res = 0;
if (auth->peer_version < 2 || auth->conf_resp_status != DPP_STATUS_OK)
return -1;
#ifdef CONFIG_DPP2
wpa_printf(MSG_DEBUG, "DPP: Send DPP Configuration Result");
status = res < 0 ? DPP_STATUS_CONFIG_REJECTED : DPP_STATUS_OK;
msg = dpp_build_conf_result(auth, status);
if (!msg)
return -1;
encaps = wpabuf_alloc(4 + wpabuf_len(msg) - 1);
if (!encaps) {
wpabuf_free(msg);
return -1;
}
wpabuf_put_be32(encaps, wpabuf_len(msg) - 1);
wpabuf_put_data(encaps, wpabuf_head_u8(msg) + 1, wpabuf_len(msg) - 1);
wpabuf_free(msg);
wpa_hexdump_buf(MSG_MSGDUMP, "DPP: Outgoing TCP message", encaps);
wpabuf_free(conn->msg_out);
conn->msg_out_pos = 0;
conn->msg_out = encaps;
conn->on_tcp_tx_complete_remove = 1;
dpp_tcp_send(conn);
/* This exchange will be terminated in the TX status handler */
return 0;
#else /* CONFIG_DPP2 */
return -1;
#endif /* CONFIG_DPP2 */
}
static int dpp_rx_gas_resp(struct dpp_connection *conn, const u8 *msg,
size_t len)
{
struct wpabuf *buf;
u8 dialog_token;
const u8 *pos, *end, *next, *adv_proto;
u16 status, slen;
if (len < 5 + 2)
return -1;
wpa_printf(MSG_DEBUG,
"DPP: Received DPP Configuration Response over TCP");
pos = msg;
end = msg + len;
dialog_token = *pos++;
status = WPA_GET_LE16(pos);
if (status != WLAN_STATUS_SUCCESS) {
wpa_printf(MSG_DEBUG, "DPP: Unexpected Status Code %u", status);
return -1;
}
pos += 2;
pos += 2; /* ignore GAS Comeback Delay */
adv_proto = pos++;
slen = *pos++;
if (*adv_proto != WLAN_EID_ADV_PROTO ||
slen > end - pos || slen < 2)
return -1;
next = pos + slen;
pos++; /* skip QueryRespLenLimit and PAME-BI */
if (slen != 8 || *pos != WLAN_EID_VENDOR_SPECIFIC ||
pos[1] != 5 || WPA_GET_BE24(&pos[2]) != OUI_WFA ||
pos[5] != DPP_OUI_TYPE || pos[6] != 0x01)
return -1;
pos = next;
/* Query Response */
if (end - pos < 2)
return -1;
slen = WPA_GET_LE16(pos);
pos += 2;
if (slen > end - pos)
return -1;
buf = wpabuf_alloc(slen);
if (!buf)
return -1;
wpabuf_put_data(buf, pos, slen);
if (!conn->relay && !conn->ctrl)
return dpp_tcp_rx_gas_resp(conn, buf);
if (!conn->relay) {
wpa_printf(MSG_DEBUG, "DPP: No matching exchange in progress");
wpabuf_free(buf);
return -1;
}
wpa_printf(MSG_DEBUG, "DPP: Relay - send over WLAN");
conn->relay->gas_resp_tx(conn->relay->cb_ctx, conn->mac_addr,
dialog_token, 0, buf);
return 0;
}
static void dpp_controller_rx(int sd, void *eloop_ctx, void *sock_ctx)
{
struct dpp_connection *conn = eloop_ctx;
int res;
const u8 *pos;
wpa_printf(MSG_DEBUG, "DPP: TCP data available for reading (sock %d)",
sd);
if (conn->msg_len_octets < 4) {
u32 msglen;
res = recv(sd, &conn->msg_len[conn->msg_len_octets],
4 - conn->msg_len_octets, 0);
if (res < 0) {
wpa_printf(MSG_DEBUG, "DPP: recv failed: %s",
strerror(errno));
dpp_connection_remove(conn);
return;
}
if (res == 0) {
wpa_printf(MSG_DEBUG,
"DPP: No more data available over TCP");
dpp_connection_remove(conn);
return;
}
wpa_printf(MSG_DEBUG,
"DPP: Received %d/%d octet(s) of message length field",
res, (int) (4 - conn->msg_len_octets));
conn->msg_len_octets += res;
if (conn->msg_len_octets < 4) {
wpa_printf(MSG_DEBUG,
"DPP: Need %d more octets of message length field",
(int) (4 - conn->msg_len_octets));
return;
}
msglen = WPA_GET_BE32(conn->msg_len);
wpa_printf(MSG_DEBUG, "DPP: Message length: %u", msglen);
if (msglen > 65535) {
wpa_printf(MSG_INFO, "DPP: Unexpectedly long message");
dpp_connection_remove(conn);
return;
}
wpabuf_free(conn->msg);
conn->msg = wpabuf_alloc(msglen);
}
if (!conn->msg) {
wpa_printf(MSG_DEBUG,
"DPP: No buffer available for receiving the message");
dpp_connection_remove(conn);
return;
}
wpa_printf(MSG_DEBUG, "DPP: Need %u more octets of message payload",
(unsigned int) wpabuf_tailroom(conn->msg));
res = recv(sd, wpabuf_put(conn->msg, 0), wpabuf_tailroom(conn->msg), 0);
if (res < 0) {
wpa_printf(MSG_DEBUG, "DPP: recv failed: %s", strerror(errno));
dpp_connection_remove(conn);
return;
}
if (res == 0) {
wpa_printf(MSG_DEBUG, "DPP: No more data available over TCP");
dpp_connection_remove(conn);
return;
}
wpa_printf(MSG_DEBUG, "DPP: Received %d octets", res);
wpabuf_put(conn->msg, res);
if (wpabuf_tailroom(conn->msg) > 0) {
wpa_printf(MSG_DEBUG,
"DPP: Need %u more octets of message payload",
(unsigned int) wpabuf_tailroom(conn->msg));
return;
}
conn->msg_len_octets = 0;
wpa_hexdump_buf(MSG_DEBUG, "DPP: Received TCP message", conn->msg);
if (wpabuf_len(conn->msg) < 1) {
dpp_connection_remove(conn);
return;
}
pos = wpabuf_head(conn->msg);
switch (*pos) {
case WLAN_PA_VENDOR_SPECIFIC:
if (dpp_controller_rx_action(conn, pos + 1,
wpabuf_len(conn->msg) - 1) < 0)
dpp_connection_remove(conn);
break;
case WLAN_PA_GAS_INITIAL_REQ:
if (dpp_controller_rx_gas_req(conn, pos + 1,
wpabuf_len(conn->msg) - 1) < 0)
dpp_connection_remove(conn);
break;
case WLAN_PA_GAS_INITIAL_RESP:
if (dpp_rx_gas_resp(conn, pos + 1,
wpabuf_len(conn->msg) - 1) < 0)
dpp_connection_remove(conn);
break;
default:
wpa_printf(MSG_DEBUG, "DPP: Ignore unsupported message type %u",
*pos);
break;
}
}
static void dpp_controller_tcp_cb(int sd, void *eloop_ctx, void *sock_ctx)
{
struct dpp_controller *ctrl = eloop_ctx;
struct sockaddr_in addr;
socklen_t addr_len = sizeof(addr);
int fd;
struct dpp_connection *conn;
wpa_printf(MSG_DEBUG, "DPP: New TCP connection");
fd = accept(ctrl->sock, (struct sockaddr *) &addr, &addr_len);
if (fd < 0) {
wpa_printf(MSG_DEBUG,
"DPP: Failed to accept new connection: %s",
strerror(errno));
return;
}
wpa_printf(MSG_DEBUG, "DPP: Connection from %s:%d",
inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
conn = os_zalloc(sizeof(*conn));
if (!conn)
goto fail;
conn->global = ctrl->global;
conn->ctrl = ctrl;
conn->sock = fd;
if (fcntl(conn->sock, F_SETFL, O_NONBLOCK) != 0) {
wpa_printf(MSG_DEBUG, "DPP: fnctl(O_NONBLOCK) failed: %s",
strerror(errno));
goto fail;
}
if (eloop_register_sock(conn->sock, EVENT_TYPE_READ,
dpp_controller_rx, conn, NULL) < 0)
goto fail;
conn->read_eloop = 1;
/* TODO: eloop timeout to expire connections that do not complete in
* reasonable time */
dl_list_add(&ctrl->conn, &conn->list);
return;
fail:
close(fd);
os_free(conn);
}
int dpp_tcp_init(struct dpp_global *dpp, struct dpp_authentication *auth,
const struct hostapd_ip_addr *addr, int port)
{
struct dpp_connection *conn;
struct sockaddr_storage saddr;
socklen_t addrlen;
const u8 *hdr, *pos, *end;
char txt[100];
wpa_printf(MSG_DEBUG, "DPP: Initialize TCP connection to %s port %d",
hostapd_ip_txt(addr, txt, sizeof(txt)), port);
if (dpp_ipaddr_to_sockaddr((struct sockaddr *) &saddr, &addrlen,
addr, port) < 0) {
dpp_auth_deinit(auth);
return -1;
}
conn = os_zalloc(sizeof(*conn));
if (!conn) {
dpp_auth_deinit(auth);
return -1;
}
conn->global = dpp;
conn->auth = auth;
conn->sock = socket(AF_INET, SOCK_STREAM, 0);
if (conn->sock < 0)
goto fail;
if (fcntl(conn->sock, F_SETFL, O_NONBLOCK) != 0) {
wpa_printf(MSG_DEBUG, "DPP: fnctl(O_NONBLOCK) failed: %s",
strerror(errno));
goto fail;
}
if (connect(conn->sock, (struct sockaddr *) &saddr, addrlen) < 0) {
if (errno != EINPROGRESS) {
wpa_printf(MSG_DEBUG, "DPP: Failed to connect: %s",
strerror(errno));
goto fail;
}
/*
* Continue connecting in the background; eloop will call us
* once the connection is ready (or failed).
*/
}
if (eloop_register_sock(conn->sock, EVENT_TYPE_WRITE,
dpp_conn_tx_ready, conn, NULL) < 0)
goto fail;
conn->write_eloop = 1;
hdr = wpabuf_head(auth->req_msg);
end = hdr + wpabuf_len(auth->req_msg);
hdr += 2; /* skip Category and Actiom */
pos = hdr + DPP_HDR_LEN;
conn->msg_out = dpp_tcp_encaps(hdr, pos, end - pos);
if (!conn->msg_out)
goto fail;
/* Message will be sent in dpp_conn_tx_ready() */
/* TODO: eloop timeout to clear a connection if it does not complete
* properly */
dl_list_add(&dpp->tcp_init, &conn->list);
return 0;
fail:
dpp_connection_free(conn);
return -1;
}
int dpp_controller_start(struct dpp_global *dpp,
struct dpp_controller_config *config)
{
struct dpp_controller *ctrl;
int on = 1;
struct sockaddr_in sin;
int port;
if (!dpp || dpp->controller)
return -1;
ctrl = os_zalloc(sizeof(*ctrl));
if (!ctrl)
return -1;
ctrl->global = dpp;
if (config->configurator_params)
ctrl->configurator_params =
os_strdup(config->configurator_params);
dl_list_init(&ctrl->conn);
/* TODO: configure these somehow */
ctrl->allowed_roles = DPP_CAPAB_ENROLLEE | DPP_CAPAB_CONFIGURATOR;
ctrl->qr_mutual = 0;
ctrl->sock = socket(AF_INET, SOCK_STREAM, 0);
if (ctrl->sock < 0)
goto fail;
if (setsockopt(ctrl->sock, SOL_SOCKET, SO_REUSEADDR,
&on, sizeof(on)) < 0) {
wpa_printf(MSG_DEBUG,
"DPP: setsockopt(SO_REUSEADDR) failed: %s",
strerror(errno));
/* try to continue anyway */
}
if (fcntl(ctrl->sock, F_SETFL, O_NONBLOCK) < 0) {
wpa_printf(MSG_INFO, "DPP: fnctl(O_NONBLOCK) failed: %s",
strerror(errno));
goto fail;
}
/* TODO: IPv6 */
os_memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
port = config->tcp_port ? config->tcp_port : DPP_TCP_PORT;
sin.sin_port = htons(port);
if (bind(ctrl->sock, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
wpa_printf(MSG_INFO,
"DPP: Failed to bind Controller TCP port: %s",
strerror(errno));
goto fail;
}
if (listen(ctrl->sock, 10 /* max backlog */) < 0 ||
fcntl(ctrl->sock, F_SETFL, O_NONBLOCK) < 0 ||
eloop_register_sock(ctrl->sock, EVENT_TYPE_READ,
dpp_controller_tcp_cb, ctrl, NULL))
goto fail;
dpp->controller = ctrl;
wpa_printf(MSG_DEBUG, "DPP: Controller started on TCP port %d", port);
return 0;
fail:
dpp_controller_free(ctrl);
return -1;
}
void dpp_controller_stop(struct dpp_global *dpp)
{
if (dpp) {
dpp_controller_free(dpp->controller);
dpp->controller = NULL;
}
}
#endif /* CONFIG_DPP2 */
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