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hostapd/wpa_supplicant/pasn_supplicant.c
Vinay Gannevaram 1711fe9121 PASN: Compute MIC from RSNE and RSNXE of the frame for Wi-Fi Aware 
Wi-Fi Aware R4 specification defines Beacon RSNE/RSNXE to be same as
RSNE/RSNXE present in Auth2 frame. So, MIC validation should be done
with the RSNE and RSNXE received in Auth2 frame.

Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>
2022-11-04 00:52:17 +02:00

2264 lines
56 KiB
C
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/*
* wpa_supplicant - PASN processing
*
* Copyright (C) 2019 Intel Corporation
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "common/dragonfly.h"
#include "common/ptksa_cache.h"
#include "utils/eloop.h"
#include "drivers/driver.h"
#include "crypto/crypto.h"
#include "crypto/random.h"
#include "eap_common/eap_defs.h"
#include "rsn_supp/wpa.h"
#include "rsn_supp/pmksa_cache.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "bss.h"
#include "scan.h"
#include "config.h"
static const int dot11RSNAConfigPMKLifetime = 43200;
struct wpa_pasn_auth_work {
u8 own_addr[ETH_ALEN];
u8 bssid[ETH_ALEN];
int akmp;
int cipher;
u16 group;
int network_id;
struct wpabuf *comeback;
};
static int wpas_pasn_send_mlme(void *ctx, const u8 *data, size_t data_len,
int noack, unsigned int freq, unsigned int wait)
{
struct wpa_supplicant *wpa_s = ctx;
return wpa_drv_send_mlme(wpa_s, data, data_len, noack, freq, wait);
}
static void wpas_pasn_free_auth_work(struct wpa_pasn_auth_work *awork)
{
wpabuf_free(awork->comeback);
awork->comeback = NULL;
os_free(awork);
}
static void wpas_pasn_auth_work_timeout(void *eloop_ctx, void *timeout_ctx)
{
struct wpa_supplicant *wpa_s = eloop_ctx;
wpa_printf(MSG_DEBUG, "PASN: Auth work timeout - stopping auth");
wpas_pasn_auth_stop(wpa_s);
wpas_pasn_auth_work_done(wpa_s, PASN_STATUS_FAILURE);
}
static void wpas_pasn_cancel_auth_work(struct wpa_supplicant *wpa_s)
{
wpa_printf(MSG_DEBUG, "PASN: Cancel pasn-start-auth work");
/* Remove pending/started work */
radio_remove_works(wpa_s, "pasn-start-auth", 0);
}
static void wpas_pasn_auth_status(struct wpa_supplicant *wpa_s, const u8 *bssid,
int akmp, int cipher, u8 status,
struct wpabuf *comeback,
u16 comeback_after)
{
if (comeback) {
size_t comeback_len = wpabuf_len(comeback);
size_t buflen = comeback_len * 2 + 1;
char *comeback_txt = os_malloc(buflen);
if (comeback_txt) {
wpa_snprintf_hex(comeback_txt, buflen,
wpabuf_head(comeback), comeback_len);
wpa_msg(wpa_s, MSG_INFO, PASN_AUTH_STATUS MACSTR
" akmp=%s, status=%u comeback_after=%u comeback=%s",
MAC2STR(bssid),
wpa_key_mgmt_txt(akmp, WPA_PROTO_RSN),
status, comeback_after, comeback_txt);
os_free(comeback_txt);
return;
}
}
wpa_msg(wpa_s, MSG_INFO,
PASN_AUTH_STATUS MACSTR " akmp=%s, status=%u",
MAC2STR(bssid), wpa_key_mgmt_txt(akmp, WPA_PROTO_RSN),
status);
}
#ifdef CONFIG_SAE
static struct wpabuf * wpas_pasn_wd_sae_commit(struct wpas_pasn *pasn)
{
struct wpabuf *buf = NULL;
int ret;
ret = sae_set_group(&pasn->sae, pasn->group);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed to set SAE group");
return NULL;
}
ret = sae_prepare_commit_pt(&pasn->sae, pasn->pt,
pasn->own_addr, pasn->bssid,
NULL, NULL);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed to prepare SAE commit");
return NULL;
}
/* Need to add the entire Authentication frame body */
buf = wpabuf_alloc(6 + SAE_COMMIT_MAX_LEN);
if (!buf) {
wpa_printf(MSG_DEBUG, "PASN: Failed to allocate SAE buffer");
return NULL;
}
wpabuf_put_le16(buf, WLAN_AUTH_SAE);
wpabuf_put_le16(buf, 1);
wpabuf_put_le16(buf, WLAN_STATUS_SAE_HASH_TO_ELEMENT);
sae_write_commit(&pasn->sae, buf, NULL, 0);
pasn->sae.state = SAE_COMMITTED;
return buf;
}
static int wpas_pasn_wd_sae_rx(struct wpas_pasn *pasn, struct wpabuf *wd)
{
const u8 *data;
size_t buf_len;
u16 len, res, alg, seq, status;
int groups[] = { pasn->group, 0 };
int ret;
if (!wd)
return -1;
data = wpabuf_head_u8(wd);
buf_len = wpabuf_len(wd);
/* first handle the commit message */
if (buf_len < 2) {
wpa_printf(MSG_DEBUG, "PASN: SAE buffer too short (commit)");
return -1;
}
len = WPA_GET_LE16(data);
if (len < 6 || buf_len - 2 < len) {
wpa_printf(MSG_DEBUG, "PASN: SAE buffer too short for commit");
return -1;
}
buf_len -= 2;
data += 2;
alg = WPA_GET_LE16(data);
seq = WPA_GET_LE16(data + 2);
status = WPA_GET_LE16(data + 4);
wpa_printf(MSG_DEBUG, "PASN: SAE: commit: alg=%u, seq=%u, status=%u",
alg, seq, status);
if (alg != WLAN_AUTH_SAE || seq != 1 ||
status != WLAN_STATUS_SAE_HASH_TO_ELEMENT) {
wpa_printf(MSG_DEBUG, "PASN: SAE: dropping peer commit");
return -1;
}
res = sae_parse_commit(&pasn->sae, data + 6, len - 6, NULL, 0, groups,
1);
if (res != WLAN_STATUS_SUCCESS) {
wpa_printf(MSG_DEBUG, "PASN: SAE failed parsing commit");
return -1;
}
/* Process the commit message and derive the PMK */
ret = sae_process_commit(&pasn->sae);
if (ret) {
wpa_printf(MSG_DEBUG, "SAE: Failed to process peer commit");
return -1;
}
buf_len -= len;
data += len;
/* Handle the confirm message */
if (buf_len < 2) {
wpa_printf(MSG_DEBUG, "PASN: SAE buffer too short (confirm)");
return -1;
}
len = WPA_GET_LE16(data);
if (len < 6 || buf_len - 2 < len) {
wpa_printf(MSG_DEBUG, "PASN: SAE buffer too short for confirm");
return -1;
}
buf_len -= 2;
data += 2;
alg = WPA_GET_LE16(data);
seq = WPA_GET_LE16(data + 2);
status = WPA_GET_LE16(data + 4);
wpa_printf(MSG_DEBUG, "PASN: SAE confirm: alg=%u, seq=%u, status=%u",
alg, seq, status);
if (alg != WLAN_AUTH_SAE || seq != 2 || status != WLAN_STATUS_SUCCESS) {
wpa_printf(MSG_DEBUG, "PASN: Dropping peer SAE confirm");
return -1;
}
res = sae_check_confirm(&pasn->sae, data + 6, len - 6);
if (res != WLAN_STATUS_SUCCESS) {
wpa_printf(MSG_DEBUG, "PASN: SAE failed checking confirm");
return -1;
}
wpa_printf(MSG_DEBUG, "PASN: SAE completed successfully");
pasn->sae.state = SAE_ACCEPTED;
return 0;
}
static struct wpabuf * wpas_pasn_wd_sae_confirm(struct wpas_pasn *pasn)
{
struct wpabuf *buf = NULL;
/* Need to add the entire authentication frame body */
buf = wpabuf_alloc(6 + SAE_CONFIRM_MAX_LEN);
if (!buf) {
wpa_printf(MSG_DEBUG, "PASN: Failed to allocate SAE buffer");
return NULL;
}
wpabuf_put_le16(buf, WLAN_AUTH_SAE);
wpabuf_put_le16(buf, 2);
wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS);
sae_write_confirm(&pasn->sae, buf);
pasn->sae.state = SAE_CONFIRMED;
return buf;
}
static struct sae_pt *
wpas_pasn_sae_derive_pt(struct wpa_ssid *ssid, int group)
{
const char *password = ssid->sae_password;
int groups[2] = { group, 0 };
if (!password)
password = ssid->passphrase;
if (!password) {
wpa_printf(MSG_DEBUG, "PASN: SAE without a password");
return NULL;
}
return sae_derive_pt(groups, ssid->ssid, ssid->ssid_len,
(const u8 *) password, os_strlen(password),
ssid->sae_password_id);
}
static int wpas_pasn_sae_setup_pt(struct wpa_ssid *ssid, int group)
{
if (!ssid->sae_password && !ssid->passphrase) {
wpa_printf(MSG_DEBUG, "PASN: SAE without a password");
return -1;
}
if (ssid->pt)
return 0; /* PT already derived */
ssid->pt = wpas_pasn_sae_derive_pt(ssid, group);
return ssid->pt ? 0 : -1;
}
#endif /* CONFIG_SAE */
static int wpas_pasn_get_params_from_bss(struct wpa_supplicant *wpa_s,
struct pasn_peer *peer)
{
int ret;
const u8 *rsne, *rsnxe;
struct wpa_bss *bss;
struct wpa_ie_data rsne_data;
int sel, key_mgmt, pairwise_cipher;
int network_id = 0, group = 19;
struct wpa_ssid *ssid = NULL;
size_t ssid_str_len = 0;
const u8 *ssid_str = NULL;
const u8 *bssid = peer->peer_addr;
bss = wpa_bss_get_bssid(wpa_s, bssid);
if (!bss) {
wpa_supplicant_update_scan_results(wpa_s);
bss = wpa_bss_get_bssid(wpa_s, bssid);
if (!bss) {
wpa_printf(MSG_DEBUG, "PASN: BSS not found");
return -1;
}
}
rsne = wpa_bss_get_ie(bss, WLAN_EID_RSN);
if (!rsne) {
wpa_printf(MSG_DEBUG, "PASN: BSS without RSNE");
return -1;
}
ret = wpa_parse_wpa_ie(rsne, *(rsne + 1) + 2, &rsne_data);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed parsing RSNE data");
return -1;
}
rsnxe = wpa_bss_get_ie(bss, WLAN_EID_RSNX);
ssid_str_len = bss->ssid_len;
ssid_str = bss->ssid;
/* Get the network configuration based on the obtained SSID */
for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
if (!wpas_network_disabled(wpa_s, ssid) &&
ssid_str_len == ssid->ssid_len &&
os_memcmp(ssid_str, ssid->ssid, ssid_str_len) == 0)
break;
}
if (ssid)
network_id = ssid->id;
sel = rsne_data.pairwise_cipher;
if (ssid && ssid->pairwise_cipher)
sel &= ssid->pairwise_cipher;
wpa_printf(MSG_DEBUG, "PASN: peer pairwise 0x%x, select 0x%x",
rsne_data.pairwise_cipher, sel);
pairwise_cipher = wpa_pick_pairwise_cipher(sel, 1);
if (pairwise_cipher < 0) {
wpa_msg(wpa_s, MSG_WARNING,
"PASN: Failed to select pairwise cipher");
return -1;
}
sel = rsne_data.key_mgmt;
if (ssid && ssid->key_mgmt)
sel &= ssid->key_mgmt;
wpa_printf(MSG_DEBUG, "PASN: peer AKMP 0x%x, select 0x%x",
rsne_data.key_mgmt, sel);
#ifdef CONFIG_SAE
if (!(wpa_s->drv_flags & WPA_DRIVER_FLAGS_SAE) || !ssid)
sel &= ~(WPA_KEY_MGMT_SAE | WPA_KEY_MGMT_SAE_EXT_KEY |
WPA_KEY_MGMT_FT_SAE | WPA_KEY_MGMT_FT_SAE_EXT_KEY);
#endif /* CONFIG_SAE */
#ifdef CONFIG_IEEE80211R
if (!(wpa_s->drv_flags & (WPA_DRIVER_FLAGS_SME |
WPA_DRIVER_FLAGS_UPDATE_FT_IES)))
sel &= ~WPA_KEY_MGMT_FT;
#endif /* CONFIG_IEEE80211R */
if (0) {
#ifdef CONFIG_IEEE80211R
#ifdef CONFIG_SHA384
} else if ((sel & WPA_KEY_MGMT_FT_IEEE8021X_SHA384) &&
os_strcmp(wpa_supplicant_get_eap_mode(wpa_s), "LEAP") != 0) {
key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X_SHA384;
wpa_printf(MSG_DEBUG, "PASN: using KEY_MGMT FT/802.1X-SHA384");
if (ssid && !ssid->ft_eap_pmksa_caching &&
pmksa_cache_get_current(wpa_s->wpa)) {
/* PMKSA caching with FT may have interoperability
* issues, so disable that case by default for now.
*/
wpa_printf(MSG_DEBUG,
"PASN: Disable PMKSA caching for FT/802.1X connection");
pmksa_cache_clear_current(wpa_s->wpa);
}
#endif /* CONFIG_SHA384 */
#endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_SAE
} else if ((sel & WPA_KEY_MGMT_SAE_EXT_KEY) &&
(ieee802_11_rsnx_capab(rsnxe,
WLAN_RSNX_CAPAB_SAE_H2E)) &&
(wpas_pasn_sae_setup_pt(ssid, group) == 0)) {
key_mgmt = WPA_KEY_MGMT_SAE_EXT_KEY;
wpa_printf(MSG_DEBUG, "PASN: using KEY_MGMT SAE (ext key)");
} else if ((sel & WPA_KEY_MGMT_SAE) &&
(ieee802_11_rsnx_capab(rsnxe,
WLAN_RSNX_CAPAB_SAE_H2E)) &&
(wpas_pasn_sae_setup_pt(ssid, group) == 0)) {
key_mgmt = WPA_KEY_MGMT_SAE;
wpa_printf(MSG_DEBUG, "PASN: using KEY_MGMT SAE");
#endif /* CONFIG_SAE */
#ifdef CONFIG_FILS
} else if (sel & WPA_KEY_MGMT_FILS_SHA384) {
key_mgmt = WPA_KEY_MGMT_FILS_SHA384;
wpa_printf(MSG_DEBUG, "PASN: using KEY_MGMT FILS-SHA384");
} else if (sel & WPA_KEY_MGMT_FILS_SHA256) {
key_mgmt = WPA_KEY_MGMT_FILS_SHA256;
wpa_printf(MSG_DEBUG, "PASN: using KEY_MGMT FILS-SHA256");
#endif /* CONFIG_FILS */
#ifdef CONFIG_IEEE80211R
} else if ((sel & WPA_KEY_MGMT_FT_IEEE8021X) &&
os_strcmp(wpa_supplicant_get_eap_mode(wpa_s), "LEAP") != 0) {
key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X;
wpa_printf(MSG_DEBUG, "PASN: using KEY_MGMT FT/802.1X");
if (ssid && !ssid->ft_eap_pmksa_caching &&
pmksa_cache_get_current(wpa_s->wpa)) {
/* PMKSA caching with FT may have interoperability
* issues, so disable that case by default for now.
*/
wpa_printf(MSG_DEBUG,
"PASN: Disable PMKSA caching for FT/802.1X connection");
pmksa_cache_clear_current(wpa_s->wpa);
}
} else if (sel & WPA_KEY_MGMT_FT_PSK) {
key_mgmt = WPA_KEY_MGMT_FT_PSK;
wpa_printf(MSG_DEBUG, "PASN: using KEY_MGMT FT/PSK");
#endif /* CONFIG_IEEE80211R */
} else if (sel & WPA_KEY_MGMT_PASN) {
key_mgmt = WPA_KEY_MGMT_PASN;
wpa_printf(MSG_DEBUG, "PASN: using KEY_MGMT PASN");
} else {
wpa_printf(MSG_DEBUG, "PASN: invalid AKMP");
return -1;
}
peer->akmp = key_mgmt;
peer->cipher = pairwise_cipher;
peer->network_id = network_id;
peer->group = group;
return 0;
}
static int wpas_pasn_set_keys_from_cache(struct wpa_supplicant *wpa_s,
const u8 *own_addr, const u8 *bssid,
int cipher, int akmp)
{
struct ptksa_cache_entry *entry;
entry = ptksa_cache_get(wpa_s->ptksa, bssid, cipher);
if (!entry) {
wpa_printf(MSG_DEBUG, "PASN: peer " MACSTR
" not present in PTKSA cache", MAC2STR(bssid));
return -1;
}
if (os_memcmp(entry->own_addr, own_addr, ETH_ALEN) != 0) {
wpa_printf(MSG_DEBUG,
"PASN: own addr " MACSTR " and PTKSA entry own addr "
MACSTR " differ",
MAC2STR(own_addr), MAC2STR(entry->own_addr));
return -1;
}
wpa_printf(MSG_DEBUG, "PASN: " MACSTR " present in PTKSA cache",
MAC2STR(bssid));
wpa_drv_set_secure_ranging_ctx(wpa_s, own_addr, bssid, cipher,
entry->ptk.tk_len,
entry->ptk.tk,
entry->ptk.ltf_keyseed_len,
entry->ptk.ltf_keyseed, 0);
return 0;
}
static void wpas_pasn_configure_next_peer(struct wpa_supplicant *wpa_s,
struct pasn_auth *pasn_params)
{
struct pasn_peer *peer;
u8 comeback_len = 0;
const u8 *comeback = NULL;
if (!pasn_params)
return;
while (wpa_s->pasn_count < pasn_params->num_peers) {
peer = &pasn_params->peer[wpa_s->pasn_count];
if (os_memcmp(wpa_s->bssid, peer->peer_addr, ETH_ALEN) == 0) {
wpa_printf(MSG_DEBUG,
"PASN: Associated peer is not expected");
peer->status = PASN_STATUS_FAILURE;
wpa_s->pasn_count++;
continue;
}
if (wpas_pasn_set_keys_from_cache(wpa_s, peer->own_addr,
peer->peer_addr,
peer->cipher,
peer->akmp) == 0) {
peer->status = PASN_STATUS_SUCCESS;
wpa_s->pasn_count++;
continue;
}
if (wpas_pasn_get_params_from_bss(wpa_s, peer)) {
peer->status = PASN_STATUS_FAILURE;
wpa_s->pasn_count++;
continue;
}
if (wpas_pasn_auth_start(wpa_s, peer->own_addr,
peer->peer_addr, peer->akmp,
peer->cipher, peer->group,
peer->network_id,
comeback, comeback_len)) {
peer->status = PASN_STATUS_FAILURE;
wpa_s->pasn_count++;
continue;
}
wpa_printf(MSG_DEBUG, "PASN: Sent PASN auth start for " MACSTR,
MAC2STR(peer->peer_addr));
return;
}
if (wpa_s->pasn_count == pasn_params->num_peers) {
wpa_drv_send_pasn_resp(wpa_s, pasn_params);
wpa_printf(MSG_DEBUG, "PASN: Response sent");
os_free(wpa_s->pasn_params);
wpa_s->pasn_params = NULL;
}
}
void wpas_pasn_auth_work_done(struct wpa_supplicant *wpa_s, int status)
{
if (!wpa_s->pasn_params)
return;
wpa_s->pasn_params->peer[wpa_s->pasn_count].status = status;
wpa_s->pasn_count++;
wpas_pasn_configure_next_peer(wpa_s, wpa_s->pasn_params);
}
static void wpas_pasn_delete_peers(struct wpa_supplicant *wpa_s,
struct pasn_auth *pasn_params)
{
struct pasn_peer *peer;
unsigned int i;
if (!pasn_params)
return;
for (i = 0; i < pasn_params->num_peers; i++) {
peer = &pasn_params->peer[i];
wpas_pasn_deauthenticate(wpa_s, peer->own_addr,
peer->peer_addr);
}
}
#ifdef CONFIG_FILS
static struct wpabuf * wpas_pasn_fils_build_auth(struct wpas_pasn *pasn)
{
struct wpabuf *buf = NULL;
struct wpabuf *erp_msg;
int ret;
erp_msg = eapol_sm_build_erp_reauth_start(pasn->eapol);
if (!erp_msg) {
wpa_printf(MSG_DEBUG,
"PASN: FILS: ERP EAP-Initiate/Re-auth unavailable");
return NULL;
}
if (random_get_bytes(pasn->fils.nonce, FILS_NONCE_LEN) < 0 ||
random_get_bytes(pasn->fils.session, FILS_SESSION_LEN) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "PASN: FILS: Nonce", pasn->fils.nonce,
FILS_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "PASN: FILS: Session", pasn->fils.session,
FILS_SESSION_LEN);
buf = wpabuf_alloc(1500);
if (!buf)
goto fail;
/* Add the authentication algorithm */
wpabuf_put_le16(buf, WLAN_AUTH_FILS_SK);
/* Authentication Transaction seq# */
wpabuf_put_le16(buf, 1);
/* Status Code */
wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS);
/* Own RSNE */
wpa_pasn_add_rsne(buf, NULL, pasn->akmp, pasn->cipher);
/* FILS Nonce */
wpabuf_put_u8(buf, WLAN_EID_EXTENSION);
wpabuf_put_u8(buf, 1 + FILS_NONCE_LEN);
wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_NONCE);
wpabuf_put_data(buf, pasn->fils.nonce, FILS_NONCE_LEN);
/* FILS Session */
wpabuf_put_u8(buf, WLAN_EID_EXTENSION);
wpabuf_put_u8(buf, 1 + FILS_SESSION_LEN);
wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_SESSION);
wpabuf_put_data(buf, pasn->fils.session, FILS_SESSION_LEN);
/* Wrapped Data (ERP) */
wpabuf_put_u8(buf, WLAN_EID_EXTENSION);
wpabuf_put_u8(buf, 1 + wpabuf_len(erp_msg));
wpabuf_put_u8(buf, WLAN_EID_EXT_WRAPPED_DATA);
wpabuf_put_buf(buf, erp_msg);
/*
* Calculate pending PMKID here so that we do not need to maintain a
* copy of the EAP-Initiate/Reauth message.
*/
ret = fils_pmkid_erp(pasn->akmp, wpabuf_head(erp_msg),
wpabuf_len(erp_msg),
pasn->fils.erp_pmkid);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: FILS: Failed to get ERP PMKID");
goto fail;
}
wpabuf_free(erp_msg);
erp_msg = NULL;
wpa_hexdump_buf(MSG_DEBUG, "PASN: FILS: Authentication frame", buf);
return buf;
fail:
wpabuf_free(erp_msg);
wpabuf_free(buf);
return NULL;
}
static void wpas_pasn_initiate_eapol(struct wpas_pasn *pasn,
struct wpa_ssid *ssid)
{
struct eapol_config eapol_conf;
wpa_printf(MSG_DEBUG, "PASN: FILS: Initiating EAPOL");
eapol_sm_notify_eap_success(pasn->eapol, false);
eapol_sm_notify_eap_fail(pasn->eapol, false);
eapol_sm_notify_portControl(pasn->eapol, Auto);
os_memset(&eapol_conf, 0, sizeof(eapol_conf));
eapol_conf.fast_reauth = pasn->fast_reauth;
eapol_conf.workaround = ssid->eap_workaround;
eapol_sm_notify_config(pasn->eapol, &ssid->eap, &eapol_conf);
}
static struct wpabuf * wpas_pasn_wd_fils_auth(struct wpas_pasn *pasn)
{
wpa_printf(MSG_DEBUG, "PASN: FILS: wrapped data - completed=%u",
pasn->fils.completed);
/* Nothing to add as we are done */
if (pasn->fils.completed)
return NULL;
if (!pasn->fils_eapol) {
wpa_printf(MSG_DEBUG,
"PASN: FILS: Missing Indication IE or PFS");
return NULL;
}
return wpas_pasn_fils_build_auth(pasn);
}
static int wpas_pasn_wd_fils_rx(struct wpas_pasn *pasn, struct wpabuf *wd)
{
struct ieee802_11_elems elems;
struct wpa_ie_data rsne_data;
u8 rmsk[ERP_MAX_KEY_LEN];
size_t rmsk_len;
u8 anonce[FILS_NONCE_LEN];
const u8 *data;
size_t buf_len;
struct wpabuf *fils_wd = NULL;
u16 alg, seq, status;
int ret;
if (!wd)
return -1;
data = wpabuf_head(wd);
buf_len = wpabuf_len(wd);
wpa_hexdump(MSG_DEBUG, "PASN: FILS: Authentication frame len=%zu",
data, buf_len);
/* first handle the header */
if (buf_len < 6) {
wpa_printf(MSG_DEBUG, "PASN: FILS: Buffer too short");
return -1;
}
alg = WPA_GET_LE16(data);
seq = WPA_GET_LE16(data + 2);
status = WPA_GET_LE16(data + 4);
wpa_printf(MSG_DEBUG, "PASN: FILS: commit: alg=%u, seq=%u, status=%u",
alg, seq, status);
if (alg != WLAN_AUTH_FILS_SK || seq != 2 ||
status != WLAN_STATUS_SUCCESS) {
wpa_printf(MSG_DEBUG,
"PASN: FILS: Dropping peer authentication");
return -1;
}
data += 6;
buf_len -= 6;
if (ieee802_11_parse_elems(data, buf_len, &elems, 1) == ParseFailed) {
wpa_printf(MSG_DEBUG, "PASN: FILS: Could not parse elements");
return -1;
}
if (!elems.rsn_ie || !elems.fils_nonce || !elems.fils_nonce ||
!elems.wrapped_data) {
wpa_printf(MSG_DEBUG, "PASN: FILS: Missing IEs");
return -1;
}
ret = wpa_parse_wpa_ie(elems.rsn_ie - 2, elems.rsn_ie_len + 2,
&rsne_data);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: FILS: Failed parsing RNSE");
return -1;
}
ret = wpa_pasn_validate_rsne(&rsne_data);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: FILS: Failed validating RSNE");
return -1;
}
if (rsne_data.num_pmkid) {
wpa_printf(MSG_DEBUG,
"PASN: FILS: Not expecting PMKID in RSNE");
return -1;
}
wpa_hexdump(MSG_DEBUG, "PASN: FILS: ANonce", elems.fils_nonce,
FILS_NONCE_LEN);
os_memcpy(anonce, elems.fils_nonce, FILS_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "PASN: FILS: FILS Session", elems.fils_session,
FILS_SESSION_LEN);
if (os_memcmp(pasn->fils.session, elems.fils_session,
FILS_SESSION_LEN)) {
wpa_printf(MSG_DEBUG, "PASN: FILS: Session mismatch");
return -1;
}
fils_wd = ieee802_11_defrag(&elems, WLAN_EID_EXTENSION,
WLAN_EID_EXT_WRAPPED_DATA);
if (!fils_wd) {
wpa_printf(MSG_DEBUG,
"PASN: FILS: Failed getting wrapped data");
return -1;
}
eapol_sm_process_erp_finish(pasn->eapol, wpabuf_head(fils_wd),
wpabuf_len(fils_wd));
wpabuf_free(fils_wd);
fils_wd = NULL;
if (eapol_sm_failed(pasn->eapol)) {
wpa_printf(MSG_DEBUG, "PASN: FILS: ERP finish failed");
return -1;
}
rmsk_len = ERP_MAX_KEY_LEN;
ret = eapol_sm_get_key(pasn->eapol, rmsk, rmsk_len);
if (ret == PMK_LEN) {
rmsk_len = PMK_LEN;
ret = eapol_sm_get_key(pasn->eapol, rmsk, rmsk_len);
}
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: FILS: Failed getting RMSK");
return -1;
}
ret = fils_rmsk_to_pmk(pasn->akmp, rmsk, rmsk_len,
pasn->fils.nonce, anonce, NULL, 0,
pasn->pmk, &pasn->pmk_len);
forced_memzero(rmsk, sizeof(rmsk));
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: FILS: Failed to derive PMK");
return -1;
}
wpa_hexdump(MSG_DEBUG, "PASN: FILS: PMKID", pasn->fils.erp_pmkid,
PMKID_LEN);
wpa_printf(MSG_DEBUG, "PASN: FILS: ERP processing succeeded");
pasn->pmksa_entry = pmksa_cache_add(pasn->pmksa, pasn->pmk,
pasn->pmk_len, pasn->fils.erp_pmkid,
NULL, 0, pasn->bssid,
pasn->own_addr, NULL,
pasn->akmp, 0);
pasn->fils.completed = true;
return 0;
}
#endif /* CONFIG_FILS */
static struct wpabuf * wpas_pasn_get_wrapped_data(struct wpas_pasn *pasn)
{
if (pasn->using_pmksa)
return NULL;
switch (pasn->akmp) {
case WPA_KEY_MGMT_PASN:
/* no wrapped data */
return NULL;
case WPA_KEY_MGMT_SAE:
#ifdef CONFIG_SAE
if (pasn->trans_seq == 0)
return wpas_pasn_wd_sae_commit(pasn);
if (pasn->trans_seq == 2)
return wpas_pasn_wd_sae_confirm(pasn);
#endif /* CONFIG_SAE */
wpa_printf(MSG_ERROR,
"PASN: SAE: Cannot derive wrapped data");
return NULL;
case WPA_KEY_MGMT_FILS_SHA256:
case WPA_KEY_MGMT_FILS_SHA384:
#ifdef CONFIG_FILS
return wpas_pasn_wd_fils_auth(pasn);
#endif /* CONFIG_FILS */
case WPA_KEY_MGMT_FT_PSK:
case WPA_KEY_MGMT_FT_IEEE8021X:
case WPA_KEY_MGMT_FT_IEEE8021X_SHA384:
/*
* Wrapped data with these AKMs is optional and is only needed
* for further validation of FT security parameters. For now do
* not use them.
*/
return NULL;
default:
wpa_printf(MSG_ERROR,
"PASN: TODO: Wrapped data for akmp=0x%x",
pasn->akmp);
return NULL;
}
}
static u8 wpas_pasn_get_wrapped_data_format(struct wpas_pasn *pasn)
{
if (pasn->using_pmksa)
return WPA_PASN_WRAPPED_DATA_NO;
/* Note: Valid AKMP is expected to already be validated */
switch (pasn->akmp) {
case WPA_KEY_MGMT_SAE:
return WPA_PASN_WRAPPED_DATA_SAE;
case WPA_KEY_MGMT_FILS_SHA256:
case WPA_KEY_MGMT_FILS_SHA384:
return WPA_PASN_WRAPPED_DATA_FILS_SK;
case WPA_KEY_MGMT_FT_PSK:
case WPA_KEY_MGMT_FT_IEEE8021X:
case WPA_KEY_MGMT_FT_IEEE8021X_SHA384:
/*
* Wrapped data with these AKMs is optional and is only needed
* for further validation of FT security parameters. For now do
* not use them.
*/
return WPA_PASN_WRAPPED_DATA_NO;
case WPA_KEY_MGMT_PASN:
default:
return WPA_PASN_WRAPPED_DATA_NO;
}
}
static struct wpabuf * wpas_pasn_build_auth_1(struct wpas_pasn *pasn,
const struct wpabuf *comeback)
{
struct wpabuf *buf, *pubkey = NULL, *wrapped_data_buf = NULL;
const u8 *pmkid;
u8 wrapped_data;
int ret;
wpa_printf(MSG_DEBUG, "PASN: Building frame 1");
if (pasn->trans_seq)
return NULL;
buf = wpabuf_alloc(1500);
if (!buf)
goto fail;
/* Get public key */
pubkey = crypto_ecdh_get_pubkey(pasn->ecdh, 0);
pubkey = wpabuf_zeropad(pubkey, crypto_ecdh_prime_len(pasn->ecdh));
if (!pubkey) {
wpa_printf(MSG_DEBUG, "PASN: Failed to get pubkey");
goto fail;
}
wrapped_data = wpas_pasn_get_wrapped_data_format(pasn);
wpa_pasn_build_auth_header(buf, pasn->bssid,
pasn->own_addr, pasn->bssid,
pasn->trans_seq + 1, WLAN_STATUS_SUCCESS);
pmkid = NULL;
if (wpa_key_mgmt_ft(pasn->akmp)) {
#ifdef CONFIG_IEEE80211R
pmkid = pasn->pmk_r1_name;
#else /* CONFIG_IEEE80211R */
goto fail;
#endif /* CONFIG_IEEE80211R */
} else if (wrapped_data != WPA_PASN_WRAPPED_DATA_NO) {
struct rsn_pmksa_cache_entry *pmksa;
pmksa = pmksa_cache_get(pasn->pmksa, pasn->bssid,
NULL, NULL, pasn->akmp);
if (pmksa && pasn->custom_pmkid_valid)
pmkid = pasn->custom_pmkid;
else if (pmksa)
pmkid = pmksa->pmkid;
/*
* Note: Even when PMKSA is available, also add wrapped data as
* it is possible that the PMKID is no longer valid at the AP.
*/
wrapped_data_buf = wpas_pasn_get_wrapped_data(pasn);
}
if (wpa_pasn_add_rsne(buf, pmkid, pasn->akmp, pasn->cipher) < 0)
goto fail;
if (!wrapped_data_buf)
wrapped_data = WPA_PASN_WRAPPED_DATA_NO;
wpa_pasn_add_parameter_ie(buf, pasn->group, wrapped_data,
pubkey, true, comeback, -1);
if (wpa_pasn_add_wrapped_data(buf, wrapped_data_buf) < 0)
goto fail;
wpa_pasn_add_rsnxe(buf, pasn->rsnxe_capab);
ret = pasn_auth_frame_hash(pasn->akmp, pasn->cipher,
wpabuf_head_u8(buf) + IEEE80211_HDRLEN,
wpabuf_len(buf) - IEEE80211_HDRLEN,
pasn->hash);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed to compute hash");
goto fail;
}
pasn->trans_seq++;
wpabuf_free(wrapped_data_buf);
wpabuf_free(pubkey);
wpa_printf(MSG_DEBUG, "PASN: Frame 1: Success");
return buf;
fail:
pasn->status = WLAN_STATUS_UNSPECIFIED_FAILURE;
wpabuf_free(wrapped_data_buf);
wpabuf_free(pubkey);
wpabuf_free(buf);
return NULL;
}
static struct wpabuf * wpas_pasn_build_auth_3(struct wpas_pasn *pasn)
{
struct wpabuf *buf, *wrapped_data_buf = NULL;
u8 mic[WPA_PASN_MAX_MIC_LEN];
u8 mic_len, data_len;
const u8 *data;
u8 *ptr;
u8 wrapped_data;
int ret;
wpa_printf(MSG_DEBUG, "PASN: Building frame 3");
if (pasn->trans_seq != 2)
return NULL;
buf = wpabuf_alloc(1500);
if (!buf)
goto fail;
wrapped_data = wpas_pasn_get_wrapped_data_format(pasn);
wpa_pasn_build_auth_header(buf, pasn->bssid,
pasn->own_addr, pasn->bssid,
pasn->trans_seq + 1, WLAN_STATUS_SUCCESS);
wrapped_data_buf = wpas_pasn_get_wrapped_data(pasn);
if (!wrapped_data_buf)
wrapped_data = WPA_PASN_WRAPPED_DATA_NO;
wpa_pasn_add_parameter_ie(buf, pasn->group, wrapped_data,
NULL, false, NULL, -1);
if (wpa_pasn_add_wrapped_data(buf, wrapped_data_buf) < 0)
goto fail;
wpabuf_free(wrapped_data_buf);
wrapped_data_buf = NULL;
/* Add the MIC */
mic_len = pasn_mic_len(pasn->akmp, pasn->cipher);
wpabuf_put_u8(buf, WLAN_EID_MIC);
wpabuf_put_u8(buf, mic_len);
ptr = wpabuf_put(buf, mic_len);
os_memset(ptr, 0, mic_len);
data = wpabuf_head_u8(buf) + IEEE80211_HDRLEN;
data_len = wpabuf_len(buf) - IEEE80211_HDRLEN;
ret = pasn_mic(pasn->ptk.kck, pasn->akmp, pasn->cipher,
pasn->own_addr, pasn->bssid,
pasn->hash, mic_len * 2, data, data_len, mic);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: frame 3: Failed MIC calculation");
goto fail;
}
#ifdef CONFIG_TESTING_OPTIONS
if (pasn->corrupt_mic) {
wpa_printf(MSG_DEBUG, "PASN: frame 3: Corrupt MIC");
mic[0] = ~mic[0];
}
#endif /* CONFIG_TESTING_OPTIONS */
os_memcpy(ptr, mic, mic_len);
pasn->trans_seq++;
wpa_printf(MSG_DEBUG, "PASN: frame 3: Success");
return buf;
fail:
pasn->status = WLAN_STATUS_UNSPECIFIED_FAILURE;
wpabuf_free(wrapped_data_buf);
wpabuf_free(buf);
return NULL;
}
static void wpa_pasn_reset(struct wpas_pasn *pasn)
{
wpa_printf(MSG_DEBUG, "PASN: Reset");
crypto_ecdh_deinit(pasn->ecdh);
pasn->ecdh = NULL;
pasn->akmp = 0;
pasn->cipher = 0;
pasn->group = 0;
pasn->trans_seq = 0;
pasn->pmk_len = 0;
pasn->using_pmksa = false;
forced_memzero(pasn->pmk, sizeof(pasn->pmk));
forced_memzero(&pasn->ptk, sizeof(pasn->ptk));
forced_memzero(&pasn->hash, sizeof(pasn->hash));
wpabuf_free(pasn->beacon_rsne_rsnxe);
pasn->beacon_rsne_rsnxe = NULL;
wpabuf_free(pasn->comeback);
pasn->comeback = NULL;
pasn->comeback_after = 0;
#ifdef CONFIG_SAE
sae_clear_data(&pasn->sae);
if (pasn->pt) {
sae_deinit_pt(pasn->pt);
pasn->pt = NULL;
}
#endif /* CONFIG_SAE */
#ifdef CONFIG_FILS
pasn->fils_eapol = false;
os_memset(&pasn->fils, 0, sizeof(pasn->fils));
#endif /* CONFIG_FILS*/
#ifdef CONFIG_IEEE80211R
forced_memzero(pasn->pmk_r1, sizeof(pasn->pmk_r1));
pasn->pmk_r1_len = 0;
os_memset(pasn->pmk_r1_name, 0, sizeof(pasn->pmk_r1_name));
#endif /* CONFIG_IEEE80211R */
pasn->status = WLAN_STATUS_UNSPECIFIED_FAILURE;
pasn->pmksa_entry = NULL;
#ifdef CONFIG_TESTING_OPTIONS
pasn->corrupt_mic = 0;
#endif /* CONFIG_TESTING_OPTIONS */
pasn->network_id = 0;
pasn->derive_kdk = false;
pasn->rsn_ie = NULL;
pasn->rsn_ie_len = 0;
pasn->rsnxe_ie = NULL;
pasn->custom_pmkid_valid = false;
}
static void wpas_pasn_reset(struct wpa_supplicant *wpa_s)
{
struct wpas_pasn *pasn = &wpa_s->pasn;
wpas_pasn_cancel_auth_work(wpa_s);
wpa_s->pasn_auth_work = NULL;
eloop_cancel_timeout(wpas_pasn_auth_work_timeout, wpa_s, NULL);
wpa_pasn_reset(pasn);
}
static int wpas_pasn_set_pmk(struct wpas_pasn *pasn,
struct wpa_ie_data *rsn_data,
struct wpa_pasn_params_data *pasn_data,
struct wpabuf *wrapped_data)
{
static const u8 pasn_default_pmk[] = {'P', 'M', 'K', 'z'};
os_memset(pasn->pmk, 0, sizeof(pasn->pmk));
pasn->pmk_len = 0;
if (pasn->akmp == WPA_KEY_MGMT_PASN) {
wpa_printf(MSG_DEBUG, "PASN: Using default PMK");
pasn->pmk_len = WPA_PASN_PMK_LEN;
os_memcpy(pasn->pmk, pasn_default_pmk,
sizeof(pasn_default_pmk));
return 0;
}
if (wpa_key_mgmt_ft(pasn->akmp)) {
#ifdef CONFIG_IEEE80211R
wpa_printf(MSG_DEBUG, "PASN: FT: Using PMK-R1");
pasn->pmk_len = pasn->pmk_r1_len;
os_memcpy(pasn->pmk, pasn->pmk_r1, pasn->pmk_r1_len);
pasn->using_pmksa = true;
return 0;
#else /* CONFIG_IEEE80211R */
wpa_printf(MSG_DEBUG, "PASN: FT: Not supported");
return -1;
#endif /* CONFIG_IEEE80211R */
}
if (rsn_data->num_pmkid) {
int ret;
struct rsn_pmksa_cache_entry *pmksa;
const u8 *pmkid = NULL;
if (pasn->custom_pmkid_valid) {
ret = pasn->validate_custom_pmkid(pasn->cb_ctx,
pasn->bssid,
rsn_data->pmkid);
if (ret) {
wpa_printf(MSG_DEBUG,
"PASN: Failed custom PMKID validation");
return -1;
}
} else {
pmkid = rsn_data->pmkid;
}
pmksa = pmksa_cache_get(pasn->pmksa, pasn->bssid,
pmkid, NULL, pasn->akmp);
if (pmksa) {
wpa_printf(MSG_DEBUG, "PASN: Using PMKSA");
pasn->pmk_len = pmksa->pmk_len;
os_memcpy(pasn->pmk, pmksa->pmk, pmksa->pmk_len);
pasn->using_pmksa = true;
return 0;
}
}
#ifdef CONFIG_SAE
if (pasn->akmp == WPA_KEY_MGMT_SAE) {
int ret;
ret = wpas_pasn_wd_sae_rx(pasn, wrapped_data);
if (ret) {
wpa_printf(MSG_DEBUG,
"PASN: Failed processing SAE wrapped data");
pasn->status = WLAN_STATUS_UNSPECIFIED_FAILURE;
return -1;
}
wpa_printf(MSG_DEBUG, "PASN: Success deriving PMK with SAE");
pasn->pmk_len = PMK_LEN;
os_memcpy(pasn->pmk, pasn->sae.pmk, PMK_LEN);
pasn->pmksa_entry = pmksa_cache_add(pasn->pmksa, pasn->pmk,
pasn->pmk_len,
pasn->sae.pmkid,
NULL, 0, pasn->bssid,
pasn->own_addr, NULL,
pasn->akmp, 0);
return 0;
}
#endif /* CONFIG_SAE */
#ifdef CONFIG_FILS
if (pasn->akmp == WPA_KEY_MGMT_FILS_SHA256 ||
pasn->akmp == WPA_KEY_MGMT_FILS_SHA384) {
int ret;
ret = wpas_pasn_wd_fils_rx(pasn, wrapped_data);
if (ret) {
wpa_printf(MSG_DEBUG,
"PASN: Failed processing FILS wrapped data");
pasn->status = WLAN_STATUS_UNSPECIFIED_FAILURE;
return -1;
}
return 0;
}
#endif /* CONFIG_FILS */
/* TODO: Derive PMK based on wrapped data */
wpa_printf(MSG_DEBUG, "PASN: Missing implementation to derive PMK");
pasn->status = WLAN_STATUS_UNSPECIFIED_FAILURE;
return -1;
}
static int wpas_pasn_start(struct wpas_pasn *pasn, const u8 *own_addr,
const u8 *bssid, int akmp, int cipher, u16 group,
int freq, const u8 *beacon_rsne, u8 beacon_rsne_len,
const u8 *beacon_rsnxe, u8 beacon_rsnxe_len,
struct wpabuf *comeback)
{
struct wpabuf *frame;
int ret;
/* TODO: Currently support only ECC groups */
if (!dragonfly_suitable_group(group, 1)) {
wpa_printf(MSG_DEBUG,
"PASN: Reject unsuitable group %u", group);
return -1;
}
switch (akmp) {
case WPA_KEY_MGMT_PASN:
break;
#ifdef CONFIG_SAE
case WPA_KEY_MGMT_SAE:
if (beacon_rsnxe &&
!ieee802_11_rsnx_capab(beacon_rsnxe,
WLAN_RSNX_CAPAB_SAE_H2E)) {
wpa_printf(MSG_DEBUG,
"PASN: AP does not support SAE H2E");
return -1;
}
pasn->sae.state = SAE_NOTHING;
pasn->sae.send_confirm = 0;
break;
#endif /* CONFIG_SAE */
#ifdef CONFIG_FILS
case WPA_KEY_MGMT_FILS_SHA256:
case WPA_KEY_MGMT_FILS_SHA384:
break;
#endif /* CONFIG_FILS */
#ifdef CONFIG_IEEE80211R
case WPA_KEY_MGMT_FT_PSK:
case WPA_KEY_MGMT_FT_IEEE8021X:
case WPA_KEY_MGMT_FT_IEEE8021X_SHA384:
break;
#endif /* CONFIG_IEEE80211R */
default:
wpa_printf(MSG_ERROR, "PASN: Unsupported AKMP=0x%x", akmp);
return -1;
}
pasn->ecdh = crypto_ecdh_init(group);
if (!pasn->ecdh) {
wpa_printf(MSG_DEBUG, "PASN: Failed to init ECDH");
goto fail;
}
if (beacon_rsne && beacon_rsne_len) {
pasn->beacon_rsne_rsnxe = wpabuf_alloc(beacon_rsne_len +
beacon_rsnxe_len);
if (!pasn->beacon_rsne_rsnxe) {
wpa_printf(MSG_DEBUG,
"PASN: Failed storing beacon RSNE/RSNXE");
goto fail;
}
wpabuf_put_data(pasn->beacon_rsne_rsnxe, beacon_rsne,
beacon_rsne_len);
if (beacon_rsnxe && beacon_rsnxe_len)
wpabuf_put_data(pasn->beacon_rsne_rsnxe, beacon_rsnxe,
beacon_rsnxe_len);
}
pasn->akmp = akmp;
pasn->cipher = cipher;
pasn->group = group;
pasn->freq = freq;
os_memcpy(pasn->own_addr, own_addr, ETH_ALEN);
os_memcpy(pasn->bssid, bssid, ETH_ALEN);
wpa_printf(MSG_DEBUG,
"PASN: Init: " MACSTR " akmp=0x%x, cipher=0x%x, group=%u",
MAC2STR(pasn->bssid), pasn->akmp, pasn->cipher,
pasn->group);
frame = wpas_pasn_build_auth_1(pasn, comeback);
if (!frame) {
wpa_printf(MSG_DEBUG, "PASN: Failed building 1st auth frame");
goto fail;
}
ret = pasn->send_mgmt(pasn->cb_ctx,
wpabuf_head(frame), wpabuf_len(frame), 0,
pasn->freq, 1000);
wpabuf_free(frame);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed sending 1st auth frame");
goto fail;
}
return 0;
fail:
return -1;
}
static struct wpa_bss * wpas_pasn_allowed(struct wpa_supplicant *wpa_s,
const u8 *bssid, int akmp, int cipher)
{
struct wpa_bss *bss;
const u8 *rsne;
struct wpa_ie_data rsne_data;
int ret;
if (os_memcmp(wpa_s->bssid, bssid, ETH_ALEN) == 0) {
wpa_printf(MSG_DEBUG,
"PASN: Not doing authentication with current BSS");
return NULL;
}
bss = wpa_bss_get_bssid(wpa_s, bssid);
if (!bss) {
wpa_printf(MSG_DEBUG, "PASN: BSS not found");
return NULL;
}
rsne = wpa_bss_get_ie(bss, WLAN_EID_RSN);
if (!rsne) {
wpa_printf(MSG_DEBUG, "PASN: BSS without RSNE");
return NULL;
}
ret = wpa_parse_wpa_ie(rsne, *(rsne + 1) + 2, &rsne_data);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed parsing RSNE data");
return NULL;
}
if (!(rsne_data.key_mgmt & akmp) ||
!(rsne_data.pairwise_cipher & cipher)) {
wpa_printf(MSG_DEBUG,
"PASN: AP does not support requested AKMP or cipher");
return NULL;
}
return bss;
}
static void wpas_pasn_auth_start_cb(struct wpa_radio_work *work, int deinit)
{
struct wpa_supplicant *wpa_s = work->wpa_s;
struct wpa_pasn_auth_work *awork = work->ctx;
struct wpas_pasn *pasn = &wpa_s->pasn;
struct wpa_ssid *ssid;
struct wpa_bss *bss;
const u8 *rsne, *rsnxe;
const u8 *indic;
u16 fils_info;
u16 capab = 0;
bool derive_kdk;
int ret;
wpa_printf(MSG_DEBUG, "PASN: auth_start_cb: deinit=%d", deinit);
if (deinit) {
if (work->started) {
eloop_cancel_timeout(wpas_pasn_auth_work_timeout,
wpa_s, NULL);
wpa_s->pasn_auth_work = NULL;
}
wpas_pasn_free_auth_work(awork);
return;
}
/*
* It is possible that by the time the callback is called, the PASN
* authentication is not allowed, e.g., a connection with the AP was
* established.
*/
bss = wpas_pasn_allowed(wpa_s, awork->bssid, awork->akmp,
awork->cipher);
if (!bss) {
wpa_printf(MSG_DEBUG, "PASN: auth_start_cb: Not allowed");
goto fail;
}
rsne = wpa_bss_get_ie(bss, WLAN_EID_RSN);
if (!rsne) {
wpa_printf(MSG_DEBUG, "PASN: BSS without RSNE");
goto fail;
}
rsnxe = wpa_bss_get_ie(bss, WLAN_EID_RSNX);
derive_kdk = (wpa_s->drv_flags2 & WPA_DRIVER_FLAGS2_SEC_LTF_STA) &&
ieee802_11_rsnx_capab(rsnxe,
WLAN_RSNX_CAPAB_SECURE_LTF);
#ifdef CONFIG_TESTING_OPTIONS
if (!derive_kdk)
derive_kdk = wpa_s->conf->force_kdk_derivation;
#endif /* CONFIG_TESTING_OPTIONS */
if (derive_kdk)
pasn->kdk_len = WPA_KDK_MAX_LEN;
else
pasn->kdk_len = 0;
wpa_printf(MSG_DEBUG, "PASN: kdk_len=%zu", pasn->kdk_len);
if ((wpa_s->drv_flags2 & WPA_DRIVER_FLAGS2_SEC_LTF_STA) &&
ieee802_11_rsnx_capab(rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF))
pasn->secure_ltf = true;
else
pasn->secure_ltf = false;
#ifdef CONFIG_TESTING_OPTIONS
pasn->corrupt_mic = wpa_s->conf->pasn_corrupt_mic;
#endif /* CONFIG_TESTING_OPTIONS */
capab |= BIT(WLAN_RSNX_CAPAB_SAE_H2E);
if (wpa_s->drv_flags2 & WPA_DRIVER_FLAGS2_SEC_LTF_STA)
capab |= BIT(WLAN_RSNX_CAPAB_SECURE_LTF);
if (wpa_s->drv_flags2 & WPA_DRIVER_FLAGS2_SEC_RTT_STA)
capab |= BIT(WLAN_RSNX_CAPAB_SECURE_RTT);
if (wpa_s->drv_flags2 & WPA_DRIVER_FLAGS2_PROT_RANGE_NEG_STA)
capab |= BIT(WLAN_RSNX_CAPAB_PROT_RANGE_NEG);
pasn->rsnxe_capab = capab;
pasn->send_mgmt = wpas_pasn_send_mlme;
ssid = wpa_config_get_network(wpa_s->conf, awork->network_id);
#ifdef CONFIG_SAE
if (awork->akmp == WPA_KEY_MGMT_SAE) {
if (!ssid) {
wpa_printf(MSG_DEBUG,
"PASN: No network profile found for SAE");
goto fail;
}
pasn->pt = wpas_pasn_sae_derive_pt(ssid, awork->group);
if (!pasn->pt) {
wpa_printf(MSG_DEBUG, "PASN: Failed to derive PT");
goto fail;
}
pasn->network_id = ssid->id;
}
#endif /* CONFIG_SAE */
#ifdef CONFIG_FILS
/* Prepare needed information for wpas_pasn_wd_fils_auth(). */
if (awork->akmp == WPA_KEY_MGMT_FILS_SHA256 ||
awork->akmp == WPA_KEY_MGMT_FILS_SHA384) {
indic = wpa_bss_get_ie(bss, WLAN_EID_FILS_INDICATION);
if (!ssid) {
wpa_printf(MSG_DEBUG, "PASN: FILS: No network block");
} else if (!indic || indic[1] < 2) {
wpa_printf(MSG_DEBUG,
"PASN: Missing FILS Indication IE");
} else {
fils_info = WPA_GET_LE16(indic + 2);
if ((fils_info & BIT(9)) && ssid) {
pasn->eapol = wpa_s->eapol;
pasn->network_id = ssid->id;
wpas_pasn_initiate_eapol(pasn, ssid);
pasn->fils_eapol = true;
} else {
wpa_printf(MSG_DEBUG,
"PASN: FILS auth without PFS not supported");
}
}
pasn->fast_reauth = wpa_s->conf->fast_reauth;
}
#endif /* CONFIG_FILS */
pasn->cb_ctx = wpa_s;
pasn->pmksa = wpa_sm_get_pmksa_cache(wpa_s->wpa);
if (wpa_key_mgmt_ft(awork->akmp)) {
#ifdef CONFIG_IEEE80211R
ret = wpa_pasn_ft_derive_pmk_r1(wpa_s->wpa, awork->akmp,
awork->bssid,
pasn->pmk_r1,
&pasn->pmk_r1_len,
pasn->pmk_r1_name);
if (ret) {
wpa_printf(MSG_DEBUG,
"PASN: FT: Failed to derive keys");
goto fail;
}
#else /* CONFIG_IEEE80211R */
goto fail;
#endif /* CONFIG_IEEE80211R */
}
ret = wpas_pasn_start(pasn, awork->own_addr, awork->bssid, awork->akmp,
awork->cipher, awork->group, bss->freq,
rsne, *(rsne + 1) + 2,
rsnxe, rsnxe ? *(rsnxe + 1) + 2 : 0,
awork->comeback);
if (ret) {
wpa_printf(MSG_DEBUG,
"PASN: Failed to start PASN authentication");
goto fail;
}
eloop_register_timeout(2, 0, wpas_pasn_auth_work_timeout, wpa_s, NULL);
/* comeback token is no longer needed at this stage */
wpabuf_free(awork->comeback);
awork->comeback = NULL;
wpa_s->pasn_auth_work = work;
return;
fail:
wpas_pasn_free_auth_work(awork);
work->ctx = NULL;
radio_work_done(work);
}
int wpas_pasn_auth_start(struct wpa_supplicant *wpa_s,
const u8 *own_addr, const u8 *bssid,
int akmp, int cipher, u16 group, int network_id,
const u8 *comeback, size_t comeback_len)
{
struct wpa_pasn_auth_work *awork;
struct wpa_bss *bss;
wpa_printf(MSG_DEBUG, "PASN: Start: " MACSTR " akmp=0x%x, cipher=0x%x",
MAC2STR(bssid), akmp, cipher);
/*
* TODO: Consider modifying the offchannel logic to handle additional
* Management frames other then Action frames. For now allow PASN only
* with drivers that support off-channel TX.
*/
if (!(wpa_s->drv_flags & WPA_DRIVER_FLAGS_OFFCHANNEL_TX)) {
wpa_printf(MSG_DEBUG,
"PASN: Driver does not support offchannel TX");
return -1;
}
if (radio_work_pending(wpa_s, "pasn-start-auth")) {
wpa_printf(MSG_DEBUG,
"PASN: send_auth: Work is already pending");
return -1;
}
if (wpa_s->pasn_auth_work) {
wpa_printf(MSG_DEBUG, "PASN: send_auth: Already in progress");
return -1;
}
bss = wpas_pasn_allowed(wpa_s, bssid, akmp, cipher);
if (!bss)
return -1;
wpas_pasn_reset(wpa_s);
awork = os_zalloc(sizeof(*awork));
if (!awork)
return -1;
os_memcpy(awork->own_addr, own_addr, ETH_ALEN);
os_memcpy(awork->bssid, bssid, ETH_ALEN);
awork->akmp = akmp;
awork->cipher = cipher;
awork->group = group;
awork->network_id = network_id;
if (comeback && comeback_len) {
awork->comeback = wpabuf_alloc_copy(comeback, comeback_len);
if (!awork->comeback) {
wpas_pasn_free_auth_work(awork);
return -1;
}
}
if (radio_add_work(wpa_s, bss->freq, "pasn-start-auth", 1,
wpas_pasn_auth_start_cb, awork) < 0) {
wpas_pasn_free_auth_work(awork);
return -1;
}
wpa_printf(MSG_DEBUG, "PASN: Auth work successfully added");
return 0;
}
void wpas_pasn_auth_stop(struct wpa_supplicant *wpa_s)
{
struct wpas_pasn *pasn = &wpa_s->pasn;
if (!wpa_s->pasn.ecdh)
return;
wpa_printf(MSG_DEBUG, "PASN: Stopping authentication");
wpas_pasn_auth_status(wpa_s, pasn->bssid, pasn->akmp, pasn->cipher,
pasn->status, pasn->comeback,
pasn->comeback_after);
wpas_pasn_reset(wpa_s);
}
static int wpas_pasn_immediate_retry(struct wpa_supplicant *wpa_s,
struct wpas_pasn *pasn,
struct wpa_pasn_params_data *params)
{
int akmp = pasn->akmp;
int cipher = pasn->cipher;
u16 group = pasn->group;
u8 own_addr[ETH_ALEN];
u8 bssid[ETH_ALEN];
wpa_printf(MSG_DEBUG, "PASN: Immediate retry");
os_memcpy(own_addr, pasn->own_addr, ETH_ALEN);
os_memcpy(bssid, pasn->bssid, ETH_ALEN);
wpas_pasn_reset(wpa_s);
return wpas_pasn_auth_start(wpa_s, own_addr, bssid, akmp, cipher, group,
pasn->network_id,
params->comeback, params->comeback_len);
}
static void wpas_pasn_deauth_cb(struct ptksa_cache_entry *entry)
{
struct wpa_supplicant *wpa_s = entry->ctx;
wpas_pasn_deauthenticate(wpa_s, entry->own_addr, entry->addr);
}
static int wpa_pasn_auth_rx(struct wpas_pasn *pasn, const u8 *data, size_t len,
struct wpa_pasn_params_data *pasn_params)
{
struct ieee802_11_elems elems;
struct wpa_ie_data rsn_data;
const struct ieee80211_mgmt *mgmt =
(const struct ieee80211_mgmt *) data;
struct wpabuf *wrapped_data = NULL, *secret = NULL, *frame = NULL;
u8 mic[WPA_PASN_MAX_MIC_LEN], out_mic[WPA_PASN_MAX_MIC_LEN];
u8 mic_len;
u16 status;
int ret, inc_y;
u16 fc = host_to_le16((WLAN_FC_TYPE_MGMT << 2) |
(WLAN_FC_STYPE_AUTH << 4));
if (!mgmt ||
len < offsetof(struct ieee80211_mgmt, u.auth.variable))
return -2;
/* Not an Authentication frame; do nothing */
if ((mgmt->frame_control & fc) != fc)
return -2;
/* Not our frame; do nothing */
if (os_memcmp(mgmt->da, pasn->own_addr, ETH_ALEN) != 0 ||
os_memcmp(mgmt->sa, pasn->bssid, ETH_ALEN) != 0 ||
os_memcmp(mgmt->bssid, pasn->bssid, ETH_ALEN) != 0)
return -2;
/* Not PASN; do nothing */
if (mgmt->u.auth.auth_alg != host_to_le16(WLAN_AUTH_PASN))
return -2;
if (mgmt->u.auth.auth_transaction !=
host_to_le16(pasn->trans_seq + 1)) {
wpa_printf(MSG_DEBUG,
"PASN: RX: Invalid transaction sequence: (%u != %u)",
le_to_host16(mgmt->u.auth.auth_transaction),
pasn->trans_seq + 1);
return -3;
}
status = le_to_host16(mgmt->u.auth.status_code);
if (status != WLAN_STATUS_SUCCESS &&
status != WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY) {
wpa_printf(MSG_DEBUG,
"PASN: Authentication rejected - status=%u", status);
goto fail;
}
if (ieee802_11_parse_elems(mgmt->u.auth.variable,
len - offsetof(struct ieee80211_mgmt,
u.auth.variable),
&elems, 0) == ParseFailed) {
wpa_printf(MSG_DEBUG,
"PASN: Failed parsing Authentication frame");
goto fail;
}
/* Check that the MIC IE exists. Save it and zero out the memory */
mic_len = pasn_mic_len(pasn->akmp, pasn->cipher);
if (status == WLAN_STATUS_SUCCESS) {
if (!elems.mic || elems.mic_len != mic_len) {
wpa_printf(MSG_DEBUG,
"PASN: Invalid MIC. Expecting len=%u",
mic_len);
goto fail;
} else {
os_memcpy(mic, elems.mic, mic_len);
/* TODO: Clean this up.. Should not be modifying the
* received message buffer. */
os_memset((u8 *) elems.mic, 0, mic_len);
}
}
if (!elems.pasn_params || !elems.pasn_params_len) {
wpa_printf(MSG_DEBUG,
"PASN: Missing PASN Parameters IE");
goto fail;
}
if (!pasn_params) {
wpa_printf(MSG_DEBUG, "PASN: pasn_params == NULL");
goto fail;
}
ret = wpa_pasn_parse_parameter_ie(elems.pasn_params - 3,
elems.pasn_params_len + 3,
true, pasn_params);
if (ret) {
wpa_printf(MSG_DEBUG,
"PASN: Failed validation PASN of Parameters IE");
goto fail;
}
if (status == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY) {
wpa_printf(MSG_DEBUG,
"PASN: Authentication temporarily rejected");
if (pasn_params->comeback && pasn_params->comeback_len) {
wpa_printf(MSG_DEBUG,
"PASN: Comeback token available. After=%u",
pasn_params->after);
if (!pasn_params->after)
return 1;
pasn->comeback = wpabuf_alloc_copy(
pasn_params->comeback,
pasn_params->comeback_len);
if (pasn->comeback)
pasn->comeback_after = pasn_params->after;
}
pasn->status = status;
goto fail;
}
ret = wpa_parse_wpa_ie(elems.rsn_ie - 2, elems.rsn_ie_len + 2,
&rsn_data);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed parsing RNSE");
goto fail;
}
ret = wpa_pasn_validate_rsne(&rsn_data);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed validating RSNE");
goto fail;
}
if (pasn->akmp != rsn_data.key_mgmt ||
pasn->cipher != rsn_data.pairwise_cipher) {
wpa_printf(MSG_DEBUG, "PASN: Mismatch in AKMP/cipher");
goto fail;
}
if (pasn->group != pasn_params->group) {
wpa_printf(MSG_DEBUG, "PASN: Mismatch in group");
goto fail;
}
if (!pasn_params->pubkey || !pasn_params->pubkey_len) {
wpa_printf(MSG_DEBUG, "PASN: Invalid public key");
goto fail;
}
if (pasn_params->pubkey[0] == WPA_PASN_PUBKEY_UNCOMPRESSED) {
inc_y = 1;
} else if (pasn_params->pubkey[0] == WPA_PASN_PUBKEY_COMPRESSED_0 ||
pasn_params->pubkey[0] == WPA_PASN_PUBKEY_COMPRESSED_1) {
inc_y = 0;
} else {
wpa_printf(MSG_DEBUG,
"PASN: Invalid first octet in pubkey=0x%x",
pasn_params->pubkey[0]);
goto fail;
}
secret = crypto_ecdh_set_peerkey(pasn->ecdh, inc_y,
pasn_params->pubkey + 1,
pasn_params->pubkey_len - 1);
if (!secret) {
wpa_printf(MSG_DEBUG, "PASN: Failed to derive shared secret");
goto fail;
}
if (pasn_params->wrapped_data_format != WPA_PASN_WRAPPED_DATA_NO) {
wrapped_data = ieee802_11_defrag(&elems,
WLAN_EID_EXTENSION,
WLAN_EID_EXT_WRAPPED_DATA);
if (!wrapped_data) {
wpa_printf(MSG_DEBUG, "PASN: Missing wrapped data");
goto fail;
}
}
ret = wpas_pasn_set_pmk(pasn, &rsn_data, pasn_params, wrapped_data);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed to set PMK");
goto fail;
}
ret = pasn_pmk_to_ptk(pasn->pmk, pasn->pmk_len,
pasn->own_addr, pasn->bssid,
wpabuf_head(secret), wpabuf_len(secret),
&pasn->ptk, pasn->akmp, pasn->cipher,
pasn->kdk_len);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed to derive PTK");
goto fail;
}
if (pasn->secure_ltf) {
ret = wpa_ltf_keyseed(&pasn->ptk, pasn->akmp, pasn->cipher);
if (ret) {
wpa_printf(MSG_DEBUG,
"PASN: Failed to derive LTF keyseed");
goto fail;
}
}
wpabuf_free(wrapped_data);
wrapped_data = NULL;
wpabuf_free(secret);
secret = NULL;
if (pasn->beacon_rsne_rsnxe) {
/* Verify the MIC */
ret = pasn_mic(pasn->ptk.kck, pasn->akmp, pasn->cipher,
pasn->bssid, pasn->own_addr,
wpabuf_head(pasn->beacon_rsne_rsnxe),
wpabuf_len(pasn->beacon_rsne_rsnxe),
(u8 *) &mgmt->u.auth,
len - offsetof(struct ieee80211_mgmt, u.auth),
out_mic);
} else {
u8 *rsne_rsnxe;
size_t rsne_rsnxe_len = 0;
/*
* Note: When Beacon rsne_rsnxe is not initialized, it is likely
* that this is for Wi-Fi Aware using PASN handshake for which
* Beacon RSNE/RSNXE are same as RSNE/RSNXE in the
* Authentication frame
*/
if (elems.rsn_ie && elems.rsn_ie_len)
rsne_rsnxe_len += elems.rsn_ie_len + 2;
if (elems.rsnxe && elems.rsnxe_len)
rsne_rsnxe_len += elems.rsnxe_len + 2;
rsne_rsnxe = os_zalloc(rsne_rsnxe_len);
if (!rsne_rsnxe)
goto fail;
if (elems.rsn_ie && elems.rsn_ie_len)
os_memcpy(rsne_rsnxe, elems.rsn_ie - 2,
elems.rsn_ie_len + 2);
if (elems.rsnxe && elems.rsnxe_len)
os_memcpy(rsne_rsnxe + elems.rsn_ie_len + 2,
elems.rsnxe - 2, elems.rsnxe_len + 2);
wpa_hexdump_key(MSG_DEBUG, "PASN: RSN + RSNXE buf",
rsne_rsnxe, rsne_rsnxe_len);
/* Verify the MIC */
ret = pasn_mic(pasn->ptk.kck, pasn->akmp, pasn->cipher,
pasn->bssid, pasn->own_addr,
rsne_rsnxe,
rsne_rsnxe_len,
(u8 *) &mgmt->u.auth,
len - offsetof(struct ieee80211_mgmt, u.auth),
out_mic);
os_free(rsne_rsnxe);
}
wpa_hexdump_key(MSG_DEBUG, "PASN: Frame MIC", mic, mic_len);
if (ret || os_memcmp(mic, out_mic, mic_len) != 0) {
wpa_printf(MSG_DEBUG, "PASN: Failed MIC verification");
goto fail;
}
pasn->trans_seq++;
wpa_printf(MSG_DEBUG, "PASN: Success verifying Authentication frame");
frame = wpas_pasn_build_auth_3(pasn);
if (!frame) {
wpa_printf(MSG_DEBUG, "PASN: Failed building 3rd auth frame");
goto fail;
}
ret = pasn->send_mgmt(pasn->cb_ctx,
wpabuf_head(frame), wpabuf_len(frame), 0,
pasn->freq, 100);
wpabuf_free(frame);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed sending 3st auth frame");
goto fail;
}
wpa_printf(MSG_DEBUG, "PASN: Success sending last frame. Store PTK");
pasn->status = WLAN_STATUS_SUCCESS;
return 0;
fail:
wpa_printf(MSG_DEBUG, "PASN: Failed RX processing - terminating");
wpabuf_free(wrapped_data);
wpabuf_free(secret);
/*
* TODO: In case of an error the standard allows to silently drop
* the frame and terminate the authentication exchange. However, better
* reply to the AP with an error status.
*/
if (status == WLAN_STATUS_SUCCESS)
pasn->status = WLAN_STATUS_UNSPECIFIED_FAILURE;
else
pasn->status = status;
return -1;
}
int wpas_pasn_auth_rx(struct wpa_supplicant *wpa_s,
const struct ieee80211_mgmt *mgmt, size_t len)
{
struct wpas_pasn *pasn = &wpa_s->pasn;
struct wpa_pasn_params_data pasn_data;
int ret;
if (!wpa_s->pasn_auth_work)
return -2;
pasn->cb_ctx = wpa_s;
ret = wpa_pasn_auth_rx(pasn, (const u8 *) mgmt, len, &pasn_data);
if (ret == 0) {
ptksa_cache_add(wpa_s->ptksa, pasn->own_addr, pasn->bssid,
pasn->cipher, dot11RSNAConfigPMKLifetime,
&pasn->ptk,
wpa_s->pasn_params ? wpas_pasn_deauth_cb : NULL,
wpa_s->pasn_params ? wpa_s : NULL, pasn->akmp);
if (pasn->pmksa_entry)
wpa_sm_set_cur_pmksa(wpa_s->wpa, pasn->pmksa_entry);
}
forced_memzero(&pasn->ptk, sizeof(pasn->ptk));
if (ret == -1) {
wpas_pasn_auth_stop(wpa_s);
wpas_pasn_auth_work_done(wpa_s, PASN_STATUS_FAILURE);
}
if (ret == 1)
ret = wpas_pasn_immediate_retry(wpa_s, pasn, &pasn_data);
return ret;
}
void wpas_pasn_auth_trigger(struct wpa_supplicant *wpa_s,
struct pasn_auth *pasn_auth)
{
struct pasn_peer *src, *dst;
unsigned int i, num_peers = pasn_auth->num_peers;
if (wpa_s->pasn_params) {
wpa_printf(MSG_DEBUG,
"PASN: auth_trigger: Already in progress");
return;
}
if (!num_peers || num_peers > WPAS_MAX_PASN_PEERS) {
wpa_printf(MSG_DEBUG,
"PASN: auth trigger: Invalid number of peers");
return;
}
wpa_s->pasn_params = os_zalloc(sizeof(struct pasn_auth));
if (!wpa_s->pasn_params) {
wpa_printf(MSG_DEBUG,
"PASN: auth trigger: Failed to allocate a buffer");
return;
}
wpa_s->pasn_count = 0;
wpa_s->pasn_params->num_peers = num_peers;
for (i = 0; i < num_peers; i++) {
dst = &wpa_s->pasn_params->peer[i];
src = &pasn_auth->peer[i];
os_memcpy(dst->own_addr, wpa_s->own_addr, ETH_ALEN);
os_memcpy(dst->peer_addr, src->peer_addr, ETH_ALEN);
dst->ltf_keyseed_required = src->ltf_keyseed_required;
dst->status = PASN_STATUS_SUCCESS;
if (!is_zero_ether_addr(src->own_addr)) {
os_memcpy(dst->own_addr, src->own_addr, ETH_ALEN);
wpa_printf(MSG_DEBUG, "PASN: Own (source) MAC addr: "
MACSTR, MAC2STR(dst->own_addr));
}
}
if (pasn_auth->action == PASN_ACTION_DELETE_SECURE_RANGING_CONTEXT) {
wpas_pasn_delete_peers(wpa_s, wpa_s->pasn_params);
os_free(wpa_s->pasn_params);
wpa_s->pasn_params = NULL;
} else if (pasn_auth->action == PASN_ACTION_AUTH) {
wpas_pasn_configure_next_peer(wpa_s, wpa_s->pasn_params);
}
}
static int wpa_pasn_auth_tx_status(struct wpas_pasn *pasn,
const u8 *data, size_t data_len, u8 acked)
{
const struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) data;
u16 fc = host_to_le16((WLAN_FC_TYPE_MGMT << 2) |
(WLAN_FC_STYPE_AUTH << 4));
wpa_printf(MSG_DEBUG, "PASN: auth_tx_status: acked=%u", acked);
if (!mgmt ||
data_len < offsetof(struct ieee80211_mgmt, u.auth.variable))
return -1;
/* Not an authentication frame; do nothing */
if ((mgmt->frame_control & fc) != fc)
return -1;
/* Not our frame; do nothing */
if (os_memcmp(mgmt->da, pasn->bssid, ETH_ALEN) ||
os_memcmp(mgmt->sa, pasn->own_addr, ETH_ALEN) ||
os_memcmp(mgmt->bssid, pasn->bssid, ETH_ALEN))
return -1;
/* Not PASN; do nothing */
if (mgmt->u.auth.auth_alg != host_to_le16(WLAN_AUTH_PASN))
return -1;
if (mgmt->u.auth.auth_transaction != host_to_le16(pasn->trans_seq)) {
wpa_printf(MSG_ERROR,
"PASN: Invalid transaction sequence: (%u != %u)",
pasn->trans_seq,
le_to_host16(mgmt->u.auth.auth_transaction));
return 0;
}
wpa_printf(MSG_ERROR,
"PASN: auth with trans_seq=%u, acked=%u", pasn->trans_seq,
acked);
/*
* Even if the frame was not acked, do not treat this is an error, and
* try to complete the flow, relying on the PASN timeout callback to
* clean up.
*/
if (pasn->trans_seq == 3) {
wpa_printf(MSG_DEBUG, "PASN: auth complete with: " MACSTR,
MAC2STR(pasn->bssid));
/*
* Either frame was not ACKed or it was ACKed but the trans_seq
* != 1, i.e., not expecting an RX frame, so we are done.
*/
return 1;
}
return 0;
}
int wpas_pasn_auth_tx_status(struct wpa_supplicant *wpa_s,
const u8 *data, size_t data_len, u8 acked)
{
struct wpas_pasn *pasn = &wpa_s->pasn;
int ret;
if (!wpa_s->pasn_auth_work) {
wpa_printf(MSG_DEBUG,
"PASN: auth_tx_status: no work in progress");
return -1;
}
ret = wpa_pasn_auth_tx_status(pasn, data, data_len, acked);
if (ret != 1)
return ret;
if (!wpa_s->pasn_params) {
wpas_pasn_auth_stop(wpa_s);
return 0;
}
wpas_pasn_set_keys_from_cache(wpa_s, pasn->own_addr, pasn->bssid,
pasn->cipher, pasn->akmp);
wpas_pasn_auth_stop(wpa_s);
wpas_pasn_auth_work_done(wpa_s, PASN_STATUS_SUCCESS);
return 0;
}
int wpas_pasn_deauthenticate(struct wpa_supplicant *wpa_s, const u8 *own_addr,
const u8 *bssid)
{
struct wpa_bss *bss;
struct wpabuf *buf;
struct ieee80211_mgmt *deauth;
int ret;
if (os_memcmp(wpa_s->bssid, bssid, ETH_ALEN) == 0) {
wpa_printf(MSG_DEBUG,
"PASN: Cannot deauthenticate from current BSS");
return -1;
}
wpa_drv_set_secure_ranging_ctx(wpa_s, own_addr, bssid, 0, 0, NULL, 0,
NULL, 1);
wpa_printf(MSG_DEBUG, "PASN: deauth: Flushing all PTKSA entries for "
MACSTR, MAC2STR(bssid));
ptksa_cache_flush(wpa_s->ptksa, bssid, WPA_CIPHER_NONE);
bss = wpa_bss_get_bssid(wpa_s, bssid);
if (!bss) {
wpa_printf(MSG_DEBUG, "PASN: deauth: BSS not found");
return -1;
}
buf = wpabuf_alloc(64);
if (!buf) {
wpa_printf(MSG_DEBUG, "PASN: deauth: Failed wpabuf allocate");
return -1;
}
deauth = wpabuf_put(buf, offsetof(struct ieee80211_mgmt,
u.deauth.variable));
deauth->frame_control = host_to_le16((WLAN_FC_TYPE_MGMT << 2) |
(WLAN_FC_STYPE_DEAUTH << 4));
os_memcpy(deauth->da, bssid, ETH_ALEN);
os_memcpy(deauth->sa, own_addr, ETH_ALEN);
os_memcpy(deauth->bssid, bssid, ETH_ALEN);
deauth->u.deauth.reason_code =
host_to_le16(WLAN_REASON_PREV_AUTH_NOT_VALID);
/*
* Since we do not expect any response from the AP, implement the
* Deauthentication frame transmission using direct call to the driver
* without a radio work.
*/
ret = wpa_drv_send_mlme(wpa_s, wpabuf_head(buf), wpabuf_len(buf), 1,
bss->freq, 0);
wpabuf_free(buf);
wpa_printf(MSG_DEBUG, "PASN: deauth: send_mlme ret=%d", ret);
return ret;
}
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