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EAP-AKA': Use HMAC-SHA-256-128 for AT_MAC

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This commit is contained in:
Jouni Malinen 2008-12-02 21:29:26 +02:00
parent f54e2c34bf
commit 806f869918
4 changed files with 117 additions and 10 deletions
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79
src/eap_common/eap_sim_common.c
View file

@ -17,6 +17,7 @@
#include "common.h"
#include "eap_common/eap_defs.h"
#include "sha1.h"
#include "sha256.h"
#include "crypto.h"
#include "aes_wrap.h"
#include "wpabuf.h"
@ -232,6 +233,74 @@ void eap_sim_add_mac(const u8 *k_aut, const u8 *msg, size_t msg_len, u8 *mac,
}
#ifdef EAP_AKA_PRIME
int eap_sim_verify_mac_sha256(const u8 *k_aut, const struct wpabuf *req,
const u8 *mac, const u8 *extra, size_t extra_len)
{
unsigned char hmac[SHA256_MAC_LEN];
const u8 *addr[2];
size_t len[2];
u8 *tmp;
if (mac == NULL || wpabuf_len(req) < EAP_SIM_MAC_LEN ||
mac < wpabuf_head_u8(req) ||
mac > wpabuf_head_u8(req) + wpabuf_len(req) - EAP_SIM_MAC_LEN)
return -1;
tmp = os_malloc(wpabuf_len(req));
if (tmp == NULL)
return -1;
addr[0] = tmp;
len[0] = wpabuf_len(req);
addr[1] = extra;
len[1] = extra_len;
/* HMAC-SHA-256-128 */
os_memcpy(tmp, wpabuf_head(req), wpabuf_len(req));
os_memset(tmp + (mac - wpabuf_head_u8(req)), 0, EAP_SIM_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Verify MAC - msg",
tmp, wpabuf_len(req));
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Verify MAC - extra data",
extra, extra_len);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-AKA': Verify MAC - K_aut",
k_aut, EAP_AKA_PRIME_K_AUT_LEN);
hmac_sha256_vector(k_aut, EAP_AKA_PRIME_K_AUT_LEN, 2, addr, len, hmac);
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Verify MAC: MAC",
hmac, EAP_SIM_MAC_LEN);
os_free(tmp);
return (os_memcmp(hmac, mac, EAP_SIM_MAC_LEN) == 0) ? 0 : 1;
}
void eap_sim_add_mac_sha256(const u8 *k_aut, const u8 *msg, size_t msg_len,
u8 *mac, const u8 *extra, size_t extra_len)
{
unsigned char hmac[SHA256_MAC_LEN];
const u8 *addr[2];
size_t len[2];
addr[0] = msg;
len[0] = msg_len;
addr[1] = extra;
len[1] = extra_len;
/* HMAC-SHA-256-128 */
os_memset(mac, 0, EAP_SIM_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Add MAC - msg", msg, msg_len);
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Add MAC - extra data",
extra, extra_len);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-AKA': Add MAC - K_aut",
k_aut, EAP_AKA_PRIME_K_AUT_LEN);
hmac_sha256_vector(k_aut, EAP_AKA_PRIME_K_AUT_LEN, 2, addr, len, hmac);
os_memcpy(mac, hmac, EAP_SIM_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA': Add MAC: MAC",
mac, EAP_SIM_MAC_LEN);
}
#endif /* EAP_AKA_PRIME */
int eap_sim_parse_attr(const u8 *start, const u8 *end,
struct eap_sim_attrs *attr, int aka, int encr)
{
@ -642,6 +711,7 @@ u8 * eap_sim_parse_encr(const u8 *k_encr, const u8 *encr_data,
struct eap_sim_msg {
struct wpabuf *buf;
size_t mac, iv, encr; /* index from buf */
int type;
};
@ -655,6 +725,7 @@ struct eap_sim_msg * eap_sim_msg_init(int code, int id, int type, int subtype)
if (msg == NULL)
return NULL;
msg->type = type;
msg->buf = wpabuf_alloc(EAP_SIM_INIT_LEN);
if (msg->buf == NULL) {
os_free(msg);
@ -686,6 +757,14 @@ struct wpabuf * eap_sim_msg_finish(struct eap_sim_msg *msg, const u8 *k_aut,
eap = wpabuf_mhead(msg->buf);
eap->length = host_to_be16(wpabuf_len(msg->buf));
#ifdef EAP_AKA_PRIME
if (k_aut && msg->mac && msg->type == EAP_TYPE_AKA_PRIME) {
eap_sim_add_mac_sha256(k_aut, (u8 *) wpabuf_head(msg->buf),
wpabuf_len(msg->buf),
(u8 *) wpabuf_mhead(msg->buf) +
msg->mac, extra, extra_len);
} else
#endif /* EAP_AKA_PRIME */
if (k_aut && msg->mac) {
eap_sim_add_mac(k_aut, (u8 *) wpabuf_head(msg->buf),
wpabuf_len(msg->buf),

7
src/eap_common/eap_sim_common.h
View file

@ -70,6 +70,8 @@
#define EAP_AKA_MIN_RES_LEN 4
#define EAP_AKA_MAX_RES_LEN 16
#define EAP_AKA_CHECKCODE_LEN 20
#define EAP_AKA_PRIME_K_AUT_LEN 32
#define EAP_AKA_PRIME_CHECKCODE_LEN 32
struct wpabuf;
@ -90,6 +92,11 @@ int eap_sim_verify_mac(const u8 *k_aut, const struct wpabuf *req,
const u8 *mac, const u8 *extra, size_t extra_len);
void eap_sim_add_mac(const u8 *k_aut, const u8 *msg, size_t msg_len, u8 *mac,
const u8 *extra, size_t extra_len);
int eap_sim_verify_mac_sha256(const u8 *k_aut, const struct wpabuf *req,
const u8 *mac, const u8 *extra,
size_t extra_len);
void eap_sim_add_mac_sha256(const u8 *k_aut, const u8 *msg, size_t msg_len,
u8 *mac, const u8 *extra, size_t extra_len);
/* EAP-SIM/AKA Attributes (0..127 non-skippable) */

23
src/eap_peer/eap_aka_prime.c
View file

@ -32,7 +32,7 @@ struct eap_aka_data {
size_t res_len;
u8 nonce_s[EAP_SIM_NONCE_S_LEN];
u8 mk[EAP_SIM_MK_LEN];
u8 k_aut[EAP_SIM_K_AUT_LEN];
u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN];
u8 k_encr[EAP_SIM_K_ENCR_LEN];
u8 msk[EAP_SIM_KEYING_DATA_LEN];
u8 emsk[EAP_EMSK_LEN];
@ -630,6 +630,18 @@ static struct wpabuf * eap_aka_process_identity(struct eap_sm *sm,
}
static int eap_aka_verify_mac(struct eap_aka_data *data,
const struct wpabuf *req,
const u8 *mac, const u8 *extra,
size_t extra_len)
{
if (data->eap_method == EAP_TYPE_AKA_PRIME)
return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
extra_len);
return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
}
static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
struct eap_aka_data *data,
u8 id,
@ -693,8 +705,7 @@ static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
data->mk);
eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
data->emsk);
if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
{
if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
"used invalid AT_MAC");
return eap_aka_client_error(data, id,
@ -782,8 +793,7 @@ static int eap_aka_process_notification_auth(struct eap_aka_data *data,
return -1;
}
if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
{
if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
wpa_printf(MSG_WARNING, "EAP-AKA: Notification message "
"used invalid AT_MAC");
return -1;
@ -861,8 +871,7 @@ static struct wpabuf * eap_aka_process_reauthentication(
}
data->reauth = 1;
if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
{
if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
"did not have valid AT_MAC");
return eap_aka_client_error(data, id,

18
src/eap_server/eap_aka_prime.c
View file

@ -26,7 +26,7 @@
struct eap_aka_data {
u8 mk[EAP_SIM_MK_LEN];
u8 nonce_s[EAP_SIM_NONCE_S_LEN];
u8 k_aut[EAP_SIM_K_AUT_LEN];
u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN];
u8 k_encr[EAP_SIM_K_ENCR_LEN];
u8 msk[EAP_SIM_KEYING_DATA_LEN];
u8 emsk[EAP_EMSK_LEN];
@ -660,6 +660,18 @@ static void eap_aka_process_identity(struct eap_sm *sm,
}
static int eap_aka_verify_mac(struct eap_aka_data *data,
const struct wpabuf *req,
const u8 *mac, const u8 *extra,
size_t extra_len)
{
if (data->eap_method == EAP_TYPE_AKA_PRIME)
return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
extra_len);
return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
}
static void eap_aka_process_challenge(struct eap_sm *sm,
struct eap_aka_data *data,
struct wpabuf *respData,
@ -680,7 +692,7 @@ static void eap_aka_process_challenge(struct eap_sm *sm,
return;
}
if (attr->mac == NULL ||
eap_sim_verify_mac(data->k_aut, respData, attr->mac, NULL, 0)) {
eap_aka_verify_mac(data, respData, attr->mac, NULL, 0)) {
wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
"did not include valid AT_MAC");
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
@ -785,7 +797,7 @@ static void eap_aka_process_reauth(struct eap_sm *sm,
wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Reauthentication");
if (attr->mac == NULL ||
eap_sim_verify_mac(data->k_aut, respData, attr->mac, data->nonce_s,
eap_aka_verify_mac(data, respData, attr->mac, data->nonce_s,
EAP_SIM_NONCE_S_LEN)) {
wpa_printf(MSG_WARNING, "EAP-AKA: Re-authentication message "
"did not include valid AT_MAC");