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Make struct wpa_eapol_key easier to use with variable length MIC

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Suite B 192-bit addition from IEEE Std 802.11ac-2013 replaced the
previous fixed length Key MIC field with a variable length field. That
change was addressed with an addition of a new struct defined for the
second MIC length. This is not really scalable and with FILS coming up
with a zero-length MIC case for AEAD, a more thorough change to support
variable length MIC is needed.

Remove the Key MIC and Key Data Length fields from the struct
wpa_eapol_key and find their location based on the MIC length
information (which is determined by the AKMP). This change allows the
separate struct wpa_eapol_key_192 to be removed since struct
wpa_eapol_key will now include only the fixed length fields that are
shared with all EAPOL-Key cases in IEEE Std 802.11.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2015-09-02 22:55:03 +03:00 committed by Jouni Malinen
parent 94f66e8a26
commit 6d014ffc6e
8 changed files with 181 additions and 205 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

59
src/ap/wpa_auth.c
View file

@ -877,7 +877,6 @@ void wpa_receive(struct wpa_authenticator *wpa_auth,
{
struct ieee802_1x_hdr *hdr;
struct wpa_eapol_key *key;
struct wpa_eapol_key_192 *key192;
u16 key_info, key_data_length;
enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
SMK_M1, SMK_M3, SMK_ERROR } msg;
@ -886,27 +885,23 @@ void wpa_receive(struct wpa_authenticator *wpa_auth,
int ft;
const u8 *eapol_key_ie, *key_data;
size_t eapol_key_ie_len, keyhdrlen, mic_len;
u8 *mic;
if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
return;
mic_len = wpa_mic_len(sm->wpa_key_mgmt);
keyhdrlen = mic_len == 24 ? sizeof(*key192) : sizeof(*key);
keyhdrlen = sizeof(*key) + mic_len + 2;
if (data_len < sizeof(*hdr) + keyhdrlen)
return;
hdr = (struct ieee802_1x_hdr *) data;
key = (struct wpa_eapol_key *) (hdr + 1);
key192 = (struct wpa_eapol_key_192 *) (hdr + 1);
mic = (u8 *) (key + 1);
key_info = WPA_GET_BE16(key->key_info);
if (mic_len == 24) {
key_data = (const u8 *) (key192 + 1);
key_data_length = WPA_GET_BE16(key192->key_data_length);
} else {
key_data = (const u8 *) (key + 1);
key_data_length = WPA_GET_BE16(key->key_data_length);
}
key_data = mic + mic_len + 2;
key_data_length = WPA_GET_BE16(mic + mic_len);
wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
" key_info=0x%x type=%u key_data_length=%u",
MAC2STR(sm->addr), key_info, key->type, key_data_length);
@ -1412,17 +1407,16 @@ void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
{
struct ieee802_1x_hdr *hdr;
struct wpa_eapol_key *key;
struct wpa_eapol_key_192 *key192;
size_t len, mic_len, keyhdrlen;
int alg;
int key_data_len, pad_len = 0;
u8 *buf, *pos;
int version, pairwise;
int i;
u8 *key_data;
u8 *key_mic, *key_data;
mic_len = wpa_mic_len(sm->wpa_key_mgmt);
keyhdrlen = mic_len == 24 ? sizeof(*key192) : sizeof(*key);
keyhdrlen = sizeof(*key) + mic_len + 2;
len = sizeof(struct ieee802_1x_hdr) + keyhdrlen;
@ -1471,7 +1465,7 @@ void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
hdr->length = host_to_be16(len - sizeof(*hdr));
key = (struct wpa_eapol_key *) (hdr + 1);
key192 = (struct wpa_eapol_key_192 *) (hdr + 1);
key_mic = (u8 *) (key + 1);
key_data = ((u8 *) (hdr + 1)) + keyhdrlen;
key->type = sm->wpa == WPA_VERSION_WPA2 ?
@ -1510,10 +1504,7 @@ void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
if (kde && !encr) {
os_memcpy(key_data, kde, kde_len);
if (mic_len == 24)
WPA_PUT_BE16(key192->key_data_length, kde_len);
else
WPA_PUT_BE16(key->key_data_length, kde_len);
WPA_PUT_BE16(key_mic + mic_len, kde_len);
} else if (encr && kde) {
buf = os_zalloc(key_data_len);
if (buf == NULL) {
@ -1539,12 +1530,7 @@ void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
os_free(buf);
return;
}
if (mic_len == 24)
WPA_PUT_BE16(key192->key_data_length,
key_data_len);
else
WPA_PUT_BE16(key->key_data_length,
key_data_len);
WPA_PUT_BE16(key_mic + mic_len, key_data_len);
#ifndef CONFIG_NO_RC4
} else if (sm->PTK.kek_len == 16) {
u8 ek[32];
@ -1555,12 +1541,7 @@ void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len);
os_memcpy(key_data, buf, key_data_len);
rc4_skip(ek, 32, 256, key_data, key_data_len);
if (mic_len == 24)
WPA_PUT_BE16(key192->key_data_length,
key_data_len);
else
WPA_PUT_BE16(key->key_data_length,
key_data_len);
WPA_PUT_BE16(key_mic + mic_len, key_data_len);
#endif /* CONFIG_NO_RC4 */
} else {
os_free(hdr);
@ -1571,8 +1552,6 @@ void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
}
if (key_info & WPA_KEY_INFO_MIC) {
u8 *key_mic;
if (!sm->PTK_valid) {
wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
"PTK not valid when sending EAPOL-Key "
@ -1581,7 +1560,6 @@ void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
return;
}
key_mic = key192->key_mic; /* same offset for key and key192 */
wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len,
sm->wpa_key_mgmt, version,
(u8 *) hdr, len, key_mic);
@ -1641,10 +1619,9 @@ static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data,
{
struct ieee802_1x_hdr *hdr;
struct wpa_eapol_key *key;
struct wpa_eapol_key_192 *key192;
u16 key_info;
int ret = 0;
u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN], *mic_pos;
size_t mic_len = wpa_mic_len(akmp);
if (data_len < sizeof(*hdr) + sizeof(*key))
@ -1652,16 +1629,16 @@ static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data,
hdr = (struct ieee802_1x_hdr *) data;
key = (struct wpa_eapol_key *) (hdr + 1);
key192 = (struct wpa_eapol_key_192 *) (hdr + 1);
mic_pos = (u8 *) (key + 1);
key_info = WPA_GET_BE16(key->key_info);
os_memcpy(mic, key192->key_mic, mic_len);
os_memset(key192->key_mic, 0, mic_len);
os_memcpy(mic, mic_pos, mic_len);
os_memset(mic_pos, 0, mic_len);
if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp,
key_info & WPA_KEY_INFO_TYPE_MASK,
data, data_len, key192->key_mic) ||
os_memcmp_const(mic, key192->key_mic, mic_len) != 0)
data, data_len, mic_pos) ||
os_memcmp_const(mic, mic_pos, mic_len) != 0)
ret = -1;
os_memcpy(key192->key_mic, mic, mic_len);
os_memcpy(mic_pos, mic, mic_len);
return ret;
}

21
src/common/wpa_common.h
View file

@ -183,24 +183,9 @@ struct wpa_eapol_key {
u8 key_iv[16];
u8 key_rsc[WPA_KEY_RSC_LEN];
u8 key_id[8]; /* Reserved in IEEE 802.11i/RSN */
u8 key_mic[16];
u8 key_data_length[2]; /* big endian */
/* followed by key_data_length bytes of key_data */
} STRUCT_PACKED;
struct wpa_eapol_key_192 {
u8 type;
/* Note: key_info, key_length, and key_data_length are unaligned */
u8 key_info[2]; /* big endian */
u8 key_length[2]; /* big endian */
u8 replay_counter[WPA_REPLAY_COUNTER_LEN];
u8 key_nonce[WPA_NONCE_LEN];
u8 key_iv[16];
u8 key_rsc[WPA_KEY_RSC_LEN];
u8 key_id[8]; /* Reserved in IEEE 802.11i/RSN */
u8 key_mic[24];
u8 key_data_length[2]; /* big endian */
/* followed by key_data_length bytes of key_data */
/* variable length Key MIC field */
/* big endian 2-octet Key Data Length field */
/* followed by Key Data Length bytes of Key Data */
} STRUCT_PACKED;
#define WPA_EAPOL_KEY_MIC_MAX_LEN 24

93
src/rsn_supp/peerkey.c
View file

@ -65,10 +65,9 @@ static int wpa_supplicant_send_smk_error(struct wpa_sm *sm, const u8 *dst,
{
size_t rlen;
struct wpa_eapol_key *err;
struct wpa_eapol_key_192 *err192;
struct rsn_error_kde error;
u8 *rbuf, *pos;
size_t kde_len;
u8 *rbuf, *pos, *mic;
size_t kde_len, mic_len = 16;
u16 key_info;
kde_len = 2 + RSN_SELECTOR_LEN + sizeof(error);
@ -76,11 +75,11 @@ static int wpa_supplicant_send_smk_error(struct wpa_sm *sm, const u8 *dst,
kde_len += 2 + RSN_SELECTOR_LEN + ETH_ALEN;
rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
NULL, sizeof(*err) + kde_len, &rlen,
(void *) &err);
NULL, sizeof(*err) + mic_len + 2 + kde_len,
&rlen, (void *) &err);
if (rbuf == NULL)
return -1;
err192 = (struct wpa_eapol_key_192 *) err;
mic = (u8 *) (err + 1);
err->type = EAPOL_KEY_TYPE_RSN;
key_info = ver | WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
@ -92,8 +91,8 @@ static int wpa_supplicant_send_smk_error(struct wpa_sm *sm, const u8 *dst,
WPA_REPLAY_COUNTER_LEN);
inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
WPA_PUT_BE16(err->key_data_length, (u16) kde_len);
pos = (u8 *) (err + 1);
WPA_PUT_BE16(mic + mic_len, (u16) kde_len);
pos = mic + mic_len + 2;
if (peer) {
/* Peer MAC Address KDE */
@ -115,7 +114,7 @@ static int wpa_supplicant_send_smk_error(struct wpa_sm *sm, const u8 *dst,
}
wpa_eapol_key_send(sm, sm->ptk.kck, sm->ptk.kck_len, ver, dst,
ETH_P_EAPOL, rbuf, rlen, err192->key_mic);
ETH_P_EAPOL, rbuf, rlen, mic);
return 0;
}
@ -128,9 +127,8 @@ static int wpa_supplicant_send_smk_m3(struct wpa_sm *sm,
{
size_t rlen;
struct wpa_eapol_key *reply;
struct wpa_eapol_key_192 *reply192;
u8 *rbuf, *pos;
size_t kde_len;
u8 *rbuf, *pos, *mic;
size_t kde_len, mic_len = 16;
u16 key_info;
/* KDEs: Peer RSN IE, Initiator MAC Address, Initiator Nonce */
@ -139,11 +137,10 @@ static int wpa_supplicant_send_smk_m3(struct wpa_sm *sm,
2 + RSN_SELECTOR_LEN + WPA_NONCE_LEN;
rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
NULL, sizeof(*reply) + kde_len, &rlen,
(void *) &reply);
NULL, sizeof(*reply) + mic_len + 2 + kde_len,
&rlen, (void *) &reply);
if (rbuf == NULL)
return -1;
reply192 = (struct wpa_eapol_key_192 *) reply;
reply->type = EAPOL_KEY_TYPE_RSN;
key_info = ver | WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
@ -155,8 +152,9 @@ static int wpa_supplicant_send_smk_m3(struct wpa_sm *sm,
os_memcpy(reply->key_nonce, peerkey->pnonce, WPA_NONCE_LEN);
WPA_PUT_BE16(reply->key_data_length, (u16) kde_len);
pos = (u8 *) (reply + 1);
mic = (u8 *) (reply + 1);
WPA_PUT_BE16(mic + mic_len, (u16) kde_len);
pos = mic + mic_len + 2;
/* Peer RSN IE */
pos = wpa_add_ie(pos, peerkey->rsnie_p, peerkey->rsnie_p_len);
@ -169,7 +167,7 @@ static int wpa_supplicant_send_smk_m3(struct wpa_sm *sm,
wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK M3");
wpa_eapol_key_send(sm, sm->ptk.kck, sm->ptk.kck_len, ver, src_addr,
ETH_P_EAPOL, rbuf, rlen, reply192->key_mic);
ETH_P_EAPOL, rbuf, rlen, mic);
return 0;
}
@ -324,18 +322,19 @@ static void wpa_supplicant_send_stk_1_of_4(struct wpa_sm *sm,
{
size_t mlen;
struct wpa_eapol_key *msg;
u8 *mbuf;
size_t kde_len;
u8 *mbuf, *mic;
size_t kde_len, mic_len = 16;
u16 key_info, ver;
kde_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
mbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
sizeof(*msg) + kde_len, &mlen,
sizeof(*msg) + mic_len + 2 + kde_len, &mlen,
(void *) &msg);
if (mbuf == NULL)
return;
mic = (u8 *) (msg + 1);
msg->type = EAPOL_KEY_TYPE_RSN;
if (peerkey->cipher != WPA_CIPHER_TKIP)
@ -355,8 +354,8 @@ static void wpa_supplicant_send_stk_1_of_4(struct wpa_sm *sm,
WPA_REPLAY_COUNTER_LEN);
inc_byte_array(peerkey->replay_counter, WPA_REPLAY_COUNTER_LEN);
WPA_PUT_BE16(msg->key_data_length, kde_len);
wpa_add_kde((u8 *) (msg + 1), RSN_KEY_DATA_PMKID,
WPA_PUT_BE16(mic + mic_len, kde_len);
wpa_add_kde(mic + mic_len + 2, RSN_KEY_DATA_PMKID,
peerkey->smkid, PMKID_LEN);
if (random_get_bytes(peerkey->inonce, WPA_NONCE_LEN)) {
@ -381,8 +380,8 @@ static void wpa_supplicant_send_stk_3_of_4(struct wpa_sm *sm,
{
size_t mlen;
struct wpa_eapol_key *msg;
u8 *mbuf, *pos;
size_t kde_len;
u8 *mbuf, *pos, *mic;
size_t kde_len, mic_len = 16;
u16 key_info, ver;
be32 lifetime;
@ -390,11 +389,12 @@ static void wpa_supplicant_send_stk_3_of_4(struct wpa_sm *sm,
2 + RSN_SELECTOR_LEN + sizeof(lifetime);
mbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
sizeof(*msg) + kde_len, &mlen,
sizeof(*msg) + mic_len + 2 + kde_len, &mlen,
(void *) &msg);
if (mbuf == NULL)
return;
mic = (u8 *) (msg + 1);
msg->type = EAPOL_KEY_TYPE_RSN;
if (peerkey->cipher != WPA_CIPHER_TKIP)
@ -415,8 +415,8 @@ static void wpa_supplicant_send_stk_3_of_4(struct wpa_sm *sm,
WPA_REPLAY_COUNTER_LEN);
inc_byte_array(peerkey->replay_counter, WPA_REPLAY_COUNTER_LEN);
WPA_PUT_BE16(msg->key_data_length, kde_len);
pos = (u8 *) (msg + 1);
WPA_PUT_BE16(mic + mic_len, kde_len);
pos = mic + mic_len;
pos = wpa_add_ie(pos, peerkey->rsnie_i, peerkey->rsnie_i_len);
lifetime = host_to_be32(peerkey->lifetime);
wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME,
@ -427,8 +427,7 @@ static void wpa_supplicant_send_stk_3_of_4(struct wpa_sm *sm,
wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key STK 3/4 to " MACSTR,
MAC2STR(peerkey->addr));
wpa_eapol_key_send(sm, peerkey->stk.kck, peerkey->stk.kck_len, ver,
peerkey->addr, ETH_P_EAPOL, mbuf, mlen,
msg->key_mic);
peerkey->addr, ETH_P_EAPOL, mbuf, mlen, mic);
}
@ -911,10 +910,10 @@ static void wpa_supplicant_process_stk_4_of_4(struct wpa_sm *sm,
*/
int peerkey_verify_eapol_key_mic(struct wpa_sm *sm,
struct wpa_peerkey *peerkey,
struct wpa_eapol_key_192 *key, u16 ver,
struct wpa_eapol_key *key, u16 ver,
const u8 *buf, size_t len)
{
u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN], *mic_pos;
size_t mic_len = 16;
int ok = 0;
@ -926,12 +925,13 @@ int peerkey_verify_eapol_key_mic(struct wpa_sm *sm,
peerkey->stk_set = 1;
}
os_memcpy(mic, key->key_mic, mic_len);
mic_pos = (u8 *) (key + 1);
os_memcpy(mic, mic_pos, mic_len);
if (peerkey->tstk_set) {
os_memset(key->key_mic, 0, mic_len);
os_memset(mic_pos, 0, mic_len);
wpa_eapol_key_mic(peerkey->tstk.kck, peerkey->tstk.kck_len,
sm->key_mgmt, ver, buf, len, key->key_mic);
if (os_memcmp_const(mic, key->key_mic, mic_len) != 0) {
sm->key_mgmt, ver, buf, len, mic_pos);
if (os_memcmp_const(mic, mic_pos, mic_len) != 0) {
wpa_printf(MSG_WARNING, "RSN: Invalid EAPOL-Key MIC "
"when using TSTK - ignoring TSTK");
} else {
@ -945,10 +945,10 @@ int peerkey_verify_eapol_key_mic(struct wpa_sm *sm,
}
if (!ok && peerkey->stk_set) {
os_memset(key->key_mic, 0, mic_len);
os_memset(mic_pos, 0, mic_len);
wpa_eapol_key_mic(peerkey->stk.kck, peerkey->stk.kck_len,
sm->key_mgmt, ver, buf, len, key->key_mic);
if (os_memcmp_const(mic, key->key_mic, mic_len) != 0) {
sm->key_mgmt, ver, buf, len, mic_pos);
if (os_memcmp_const(mic, mic_pos, mic_len) != 0) {
wpa_printf(MSG_WARNING, "RSN: Invalid EAPOL-Key MIC "
"- dropping packet");
return -1;
@ -980,10 +980,10 @@ int peerkey_verify_eapol_key_mic(struct wpa_sm *sm,
*/
int wpa_sm_stkstart(struct wpa_sm *sm, const u8 *peer)
{
size_t rlen, kde_len;
size_t rlen, kde_len, mic_len;
struct wpa_eapol_key *req;
int key_info, ver;
u8 bssid[ETH_ALEN], *rbuf, *pos, *count_pos;
u8 bssid[ETH_ALEN], *rbuf, *pos, *count_pos, *mic;
u16 count;
struct rsn_ie_hdr *hdr;
struct wpa_peerkey *peerkey;
@ -999,6 +999,7 @@ int wpa_sm_stkstart(struct wpa_sm *sm, const u8 *peer)
return -1;
}
mic_len = wpa_mic_len(sm->key_mgmt);
if (sm->pairwise_cipher != WPA_CIPHER_TKIP)
ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
else
@ -1047,7 +1048,7 @@ int wpa_sm_stkstart(struct wpa_sm *sm, const u8 *peer)
kde_len = peerkey->rsnie_i_len + 2 + RSN_SELECTOR_LEN + ETH_ALEN;
rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
sizeof(*req) + kde_len, &rlen,
sizeof(*req) + mic_len + 2 + kde_len, &rlen,
(void *) &req);
if (rbuf == NULL) {
wpa_supplicant_peerkey_free(sm, peerkey);
@ -1074,8 +1075,10 @@ int wpa_sm_stkstart(struct wpa_sm *sm, const u8 *peer)
wpa_hexdump(MSG_DEBUG, "WPA: INonce for SMK handshake",
req->key_nonce, WPA_NONCE_LEN);
WPA_PUT_BE16(req->key_data_length, (u16) kde_len);
pos = (u8 *) (req + 1);
mic = pos = (u8 *) (req + 1);
pos += mic_len;
WPA_PUT_BE16(pos, (u16) kde_len);
pos += 2;
/* Initiator RSN IE */
pos = wpa_add_ie(pos, peerkey->rsnie_i, peerkey->rsnie_i_len);
@ -1085,7 +1088,7 @@ int wpa_sm_stkstart(struct wpa_sm *sm, const u8 *peer)
wpa_printf(MSG_INFO, "RSN: Sending EAPOL-Key SMK M1 Request (peer "
MACSTR ")", MAC2STR(peer));
wpa_eapol_key_send(sm, sm->ptk.kck, sm->ptk.kck_len, ver, bssid,
ETH_P_EAPOL, rbuf, rlen, req->key_mic);
ETH_P_EAPOL, rbuf, rlen, mic);
peerkey->next = sm->peerkey;
sm->peerkey = peerkey;

2
src/rsn_supp/peerkey.h
View file

@ -38,7 +38,7 @@ struct wpa_peerkey {
int peerkey_verify_eapol_key_mic(struct wpa_sm *sm,
struct wpa_peerkey *peerkey,
struct wpa_eapol_key_192 *key, u16 ver,
struct wpa_eapol_key *key, u16 ver,
const u8 *buf, size_t len);
void peerkey_rx_eapol_4way(struct wpa_sm *sm, struct wpa_peerkey *peerkey,
struct wpa_eapol_key *key, u16 key_info, u16 ver,

99
src/rsn_supp/wpa.c
View file

@ -97,9 +97,8 @@ void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise)
{
size_t mic_len, hdrlen, rlen;
struct wpa_eapol_key *reply;
struct wpa_eapol_key_192 *reply192;
int key_info, ver;
u8 bssid[ETH_ALEN], *rbuf, *key_mic;
u8 bssid[ETH_ALEN], *rbuf, *key_mic, *mic;
if (sm->key_mgmt == WPA_KEY_MGMT_OSEN ||
wpa_key_mgmt_suite_b(sm->key_mgmt))
@ -119,12 +118,11 @@ void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise)
}
mic_len = wpa_mic_len(sm->key_mgmt);
hdrlen = mic_len == 24 ? sizeof(*reply192) : sizeof(*reply);
hdrlen = sizeof(*reply) + mic_len + 2;
rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
hdrlen, &rlen, (void *) &reply);
if (rbuf == NULL)
return;
reply192 = (struct wpa_eapol_key_192 *) reply;
reply->type = (sm->proto == WPA_PROTO_RSN ||
sm->proto == WPA_PROTO_OSEN) ?
@ -142,14 +140,12 @@ void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise)
WPA_REPLAY_COUNTER_LEN);
inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
if (mic_len == 24)
WPA_PUT_BE16(reply192->key_data_length, 0);
else
WPA_PUT_BE16(reply->key_data_length, 0);
mic = (u8 *) (reply + 1);
WPA_PUT_BE16(mic + mic_len, 0);
if (!(key_info & WPA_KEY_INFO_MIC))
key_mic = NULL;
else
key_mic = reply192->key_mic; /* same offset in reply */
key_mic = mic;
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: Sending EAPOL-Key Request (error=%d "
@ -341,7 +337,6 @@ int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst,
{
size_t mic_len, hdrlen, rlen;
struct wpa_eapol_key *reply;
struct wpa_eapol_key_192 *reply192;
u8 *rbuf, *key_mic;
u8 *rsn_ie_buf = NULL;
@ -384,7 +379,7 @@ int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst,
wpa_hexdump(MSG_DEBUG, "WPA: WPA IE for msg 2/4", wpa_ie, wpa_ie_len);
mic_len = wpa_mic_len(sm->key_mgmt);
hdrlen = mic_len == 24 ? sizeof(*reply192) : sizeof(*reply);
hdrlen = sizeof(*reply) + mic_len + 2;
rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
NULL, hdrlen + wpa_ie_len,
&rlen, (void *) &reply);
@ -392,7 +387,6 @@ int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst,
os_free(rsn_ie_buf);
return -1;
}
reply192 = (struct wpa_eapol_key_192 *) reply;
reply->type = (sm->proto == WPA_PROTO_RSN ||
sm->proto == WPA_PROTO_OSEN) ?
@ -408,14 +402,9 @@ int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst,
wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter", reply->replay_counter,
WPA_REPLAY_COUNTER_LEN);
key_mic = reply192->key_mic; /* same offset for reply and reply192 */
if (mic_len == 24) {
WPA_PUT_BE16(reply192->key_data_length, wpa_ie_len);
os_memcpy(reply192 + 1, wpa_ie, wpa_ie_len);
} else {
WPA_PUT_BE16(reply->key_data_length, wpa_ie_len);
os_memcpy(reply + 1, wpa_ie, wpa_ie_len);
}
key_mic = (u8 *) (reply + 1);
WPA_PUT_BE16(key_mic + mic_len, wpa_ie_len); /* Key Data Length */
os_memcpy(key_mic + mic_len + 2, wpa_ie, wpa_ie_len); /* Key Data */
os_free(rsn_ie_buf);
os_memcpy(reply->key_nonce, nonce, WPA_NONCE_LEN);
@ -1147,16 +1136,14 @@ int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst,
{
size_t mic_len, hdrlen, rlen;
struct wpa_eapol_key *reply;
struct wpa_eapol_key_192 *reply192;
u8 *rbuf, *key_mic;
mic_len = wpa_mic_len(sm->key_mgmt);
hdrlen = mic_len == 24 ? sizeof(*reply192) : sizeof(*reply);
hdrlen = sizeof(*reply) + mic_len + 2;
rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
hdrlen, &rlen, (void *) &reply);
if (rbuf == NULL)
return -1;
reply192 = (struct wpa_eapol_key_192 *) reply;
reply->type = (sm->proto == WPA_PROTO_RSN ||
sm->proto == WPA_PROTO_OSEN) ?
@ -1171,11 +1158,8 @@ int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst,
os_memcpy(reply->replay_counter, key->replay_counter,
WPA_REPLAY_COUNTER_LEN);
key_mic = reply192->key_mic; /* same offset for reply and reply192 */
if (mic_len == 24)
WPA_PUT_BE16(reply192->key_data_length, 0);
else
WPA_PUT_BE16(reply->key_data_length, 0);
key_mic = (u8 *) (reply + 1);
WPA_PUT_BE16(key_mic + mic_len, 0);
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4");
return wpa_eapol_key_send(sm, ptk->kck, ptk->kck_len, ver, dst,
@ -1456,16 +1440,14 @@ static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm,
{
size_t mic_len, hdrlen, rlen;
struct wpa_eapol_key *reply;
struct wpa_eapol_key_192 *reply192;
u8 *rbuf, *key_mic;
mic_len = wpa_mic_len(sm->key_mgmt);
hdrlen = mic_len == 24 ? sizeof(*reply192) : sizeof(*reply);
hdrlen = sizeof(*reply) + mic_len + 2;
rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
hdrlen, &rlen, (void *) &reply);
if (rbuf == NULL)
return -1;
reply192 = (struct wpa_eapol_key_192 *) reply;
reply->type = (sm->proto == WPA_PROTO_RSN ||
sm->proto == WPA_PROTO_OSEN) ?
@ -1480,11 +1462,8 @@ static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm,
os_memcpy(reply->replay_counter, key->replay_counter,
WPA_REPLAY_COUNTER_LEN);
key_mic = reply192->key_mic; /* same offset for reply and reply192 */
if (mic_len == 24)
WPA_PUT_BE16(reply192->key_data_length, 0);
else
WPA_PUT_BE16(reply->key_data_length, 0);
key_mic = (u8 *) (reply + 1);
WPA_PUT_BE16(key_mic + mic_len, 0);
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2");
return wpa_eapol_key_send(sm, sm->ptk.kck, sm->ptk.kck_len, ver,
@ -1564,7 +1543,7 @@ failed:
static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
struct wpa_eapol_key_192 *key,
struct wpa_eapol_key *key,
u16 ver,
const u8 *buf, size_t len)
{
@ -1572,12 +1551,12 @@ static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
int ok = 0;
size_t mic_len = wpa_mic_len(sm->key_mgmt);
os_memcpy(mic, key->key_mic, mic_len);
os_memcpy(mic, key + 1, mic_len);
if (sm->tptk_set) {
os_memset(key->key_mic, 0, mic_len);
os_memset(key + 1, 0, mic_len);
wpa_eapol_key_mic(sm->tptk.kck, sm->tptk.kck_len, sm->key_mgmt,
ver, buf, len, key->key_mic);
if (os_memcmp_const(mic, key->key_mic, mic_len) != 0) {
ver, buf, len, (u8 *) (key + 1));
if (os_memcmp_const(mic, key + 1, mic_len) != 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Invalid EAPOL-Key MIC "
"when using TPTK - ignoring TPTK");
@ -1591,10 +1570,10 @@ static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
}
if (!ok && sm->ptk_set) {
os_memset(key->key_mic, 0, mic_len);
os_memset(key + 1, 0, mic_len);
wpa_eapol_key_mic(sm->ptk.kck, sm->ptk.kck_len, sm->key_mgmt,
ver, buf, len, key->key_mic);
if (os_memcmp_const(mic, key->key_mic, mic_len) != 0) {
ver, buf, len, (u8 *) (key + 1));
if (os_memcmp_const(mic, key + 1, mic_len) != 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Invalid EAPOL-Key MIC - "
"dropping packet");
@ -1619,7 +1598,8 @@ static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
/* Decrypt RSN EAPOL-Key key data (RC4 or AES-WRAP) */
static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm,
struct wpa_eapol_key *key, u16 ver,
struct wpa_eapol_key *key,
size_t mic_len, u16 ver,
u8 *key_data, size_t *key_data_len)
{
wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data",
@ -1678,7 +1658,7 @@ static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm,
}
os_memcpy(key_data, buf, *key_data_len);
bin_clear_free(buf, *key_data_len);
WPA_PUT_BE16(key->key_data_length, *key_data_len);
WPA_PUT_BE16(((u8 *) (key + 1)) + mic_len, *key_data_len);
} else {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Unsupported key_info type %d", ver);
@ -1763,12 +1743,11 @@ int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
size_t plen, data_len, key_data_len;
const struct ieee802_1x_hdr *hdr;
struct wpa_eapol_key *key;
struct wpa_eapol_key_192 *key192;
u16 key_info, ver;
u8 *tmp = NULL;
int ret = -1;
struct wpa_peerkey *peerkey = NULL;
u8 *key_data;
u8 *mic, *key_data;
size_t mic_len, keyhdrlen;
#ifdef CONFIG_IEEE80211R
@ -1776,7 +1755,7 @@ int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
#endif /* CONFIG_IEEE80211R */
mic_len = wpa_mic_len(sm->key_mgmt);
keyhdrlen = mic_len == 24 ? sizeof(*key192) : sizeof(*key);
keyhdrlen = sizeof(*key) + mic_len + 2;
if (len < sizeof(*hdr) + keyhdrlen) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
@ -1828,12 +1807,8 @@ int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
goto out;
os_memcpy(tmp, buf, data_len);
key = (struct wpa_eapol_key *) (tmp + sizeof(struct ieee802_1x_hdr));
key192 = (struct wpa_eapol_key_192 *)
(tmp + sizeof(struct ieee802_1x_hdr));
if (mic_len == 24)
key_data = (u8 *) (key192 + 1);
else
key_data = (u8 *) (key + 1);
mic = (u8 *) (key + 1);
key_data = mic + mic_len + 2;
if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN)
{
@ -1844,11 +1819,8 @@ int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
goto out;
}
if (mic_len == 24)
key_data_len = WPA_GET_BE16(key192->key_data_length);
else
key_data_len = WPA_GET_BE16(key->key_data_length);
wpa_eapol_key_dump(sm, key, key_data_len, key192->key_mic, mic_len);
key_data_len = WPA_GET_BE16(mic + mic_len);
wpa_eapol_key_dump(sm, key, key_data_len, mic, mic_len);
if (key_data_len > plen - keyhdrlen) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Invalid EAPOL-Key "
@ -2004,19 +1976,20 @@ int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
}
if ((key_info & WPA_KEY_INFO_MIC) && !peerkey &&
wpa_supplicant_verify_eapol_key_mic(sm, key192, ver, tmp, data_len))
wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len))
goto out;
#ifdef CONFIG_PEERKEY
if ((key_info & WPA_KEY_INFO_MIC) && peerkey &&
peerkey_verify_eapol_key_mic(sm, peerkey, key192, ver, tmp,
peerkey_verify_eapol_key_mic(sm, peerkey, key, ver, tmp,
data_len))
goto out;
#endif /* CONFIG_PEERKEY */
if ((sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) &&
(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
if (wpa_supplicant_decrypt_key_data(sm, key, ver, key_data,
if (wpa_supplicant_decrypt_key_data(sm, key, mic_len,
ver, key_data,
&key_data_len))
goto out;
}

2
wlantest/rx_data.c
View file

@ -59,7 +59,7 @@ static void rx_data_eth(struct wlantest *wt, const u8 *bssid,
{
switch (ethertype) {
case ETH_P_PAE:
rx_data_eapol(wt, dst, src, data, len, prot);
rx_data_eapol(wt, bssid, sta_addr, dst, src, data, len, prot);
break;
case ETH_P_IP:
rx_data_ip(wt, bssid, sta_addr, dst, src, data, len,

107
wlantest/rx_eapol.c
View file

@ -39,7 +39,7 @@ static int check_mic(const u8 *kck, size_t kck_len, int akmp, int ver,
struct ieee802_1x_hdr *hdr;
struct wpa_eapol_key *key;
u8 rx_mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
size_t mic_len = 16;
size_t mic_len = wpa_mic_len(akmp);
buf = os_malloc(len);
if (buf == NULL)
@ -48,12 +48,12 @@ static int check_mic(const u8 *kck, size_t kck_len, int akmp, int ver,
hdr = (struct ieee802_1x_hdr *) buf;
key = (struct wpa_eapol_key *) (hdr + 1);
os_memcpy(rx_mic, key->key_mic, mic_len);
os_memset(key->key_mic, 0, mic_len);
os_memcpy(rx_mic, key + 1, mic_len);
os_memset(key + 1, 0, mic_len);
if (wpa_eapol_key_mic(kck, kck_len, akmp, ver, buf, len,
key->key_mic) == 0 &&
os_memcmp(rx_mic, key->key_mic, mic_len) == 0)
(u8 *) (key + 1)) == 0 &&
os_memcmp(rx_mic, key + 1, mic_len) == 0)
ret = 0;
os_free(buf);
@ -229,8 +229,8 @@ static void rx_data_eapol_key_2_of_4(struct wlantest *wt, const u8 *dst,
struct wlantest_sta *sta;
const struct ieee802_1x_hdr *eapol;
const struct wpa_eapol_key *hdr;
const u8 *key_data, *kck;
size_t kck_len;
const u8 *key_data, *kck, *mic;
size_t kck_len, mic_len;
u16 key_info, key_data_len;
struct wpa_eapol_ie_parse ie;
@ -245,6 +245,8 @@ static void rx_data_eapol_key_2_of_4(struct wlantest *wt, const u8 *dst,
eapol = (const struct ieee802_1x_hdr *) data;
hdr = (const struct wpa_eapol_key *) (eapol + 1);
mic_len = wpa_mic_len(sta->key_mgmt);
mic = (const u8 *) (hdr + 1);
if (is_zero(hdr->key_nonce, WPA_NONCE_LEN)) {
add_note(wt, MSG_INFO, "EAPOL-Key 2/4 from " MACSTR
" used zero nonce", MAC2STR(src));
@ -255,7 +257,7 @@ static void rx_data_eapol_key_2_of_4(struct wlantest *wt, const u8 *dst,
}
os_memcpy(sta->snonce, hdr->key_nonce, WPA_NONCE_LEN);
key_info = WPA_GET_BE16(hdr->key_info);
key_data_len = WPA_GET_BE16(hdr->key_data_length);
key_data_len = WPA_GET_BE16(mic + mic_len);
derive_ptk(wt, bss, sta, key_info & WPA_KEY_INFO_TYPE_MASK, data, len);
if (!sta->ptk_set && !sta->tptk_set) {
@ -279,7 +281,7 @@ static void rx_data_eapol_key_2_of_4(struct wlantest *wt, const u8 *dst,
}
add_note(wt, MSG_DEBUG, "Valid MIC found in EAPOL-Key 2/4");
key_data = (const u8 *) (hdr + 1);
key_data = mic + mic_len + 2;
if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0) {
add_note(wt, MSG_INFO, "Failed to parse EAPOL-Key Key Data");
@ -348,10 +350,10 @@ static void rx_data_eapol_key_2_of_4(struct wlantest *wt, const u8 *dst,
static u8 * decrypt_eapol_key_data_rc4(struct wlantest *wt, const u8 *kek,
const struct wpa_eapol_key *hdr,
const u8 *keydata, u16 keydatalen,
size_t *len)
{
u8 ek[32], *buf;
u16 keydatalen = WPA_GET_BE16(hdr->key_data_length);
buf = os_malloc(keydatalen);
if (buf == NULL)
@ -359,7 +361,7 @@ static u8 * decrypt_eapol_key_data_rc4(struct wlantest *wt, const u8 *kek,
os_memcpy(ek, hdr->key_iv, 16);
os_memcpy(ek + 16, kek, 16);
os_memcpy(buf, hdr + 1, keydatalen);
os_memcpy(buf, keydata, keydatalen);
if (rc4_skip(ek, 32, 256, buf, keydatalen)) {
add_note(wt, MSG_INFO, "RC4 failed");
os_free(buf);
@ -373,10 +375,10 @@ static u8 * decrypt_eapol_key_data_rc4(struct wlantest *wt, const u8 *kek,
static u8 * decrypt_eapol_key_data_aes(struct wlantest *wt, const u8 *kek,
const struct wpa_eapol_key *hdr,
const u8 *keydata, u16 keydatalen,
size_t *len)
{
u8 *buf;
u16 keydatalen = WPA_GET_BE16(hdr->key_data_length);
if (keydatalen % 8) {
add_note(wt, MSG_INFO, "Unsupported AES-WRAP len %d",
@ -387,7 +389,7 @@ static u8 * decrypt_eapol_key_data_aes(struct wlantest *wt, const u8 *kek,
buf = os_malloc(keydatalen);
if (buf == NULL)
return NULL;
if (aes_unwrap(kek, 16, keydatalen / 8, (u8 *) (hdr + 1), buf)) {
if (aes_unwrap(kek, 16, keydatalen / 8, keydata, buf)) {
os_free(buf);
add_note(wt, MSG_INFO,
"AES unwrap failed - could not decrypt EAPOL-Key "
@ -400,22 +402,35 @@ static u8 * decrypt_eapol_key_data_aes(struct wlantest *wt, const u8 *kek,
}
static u8 * decrypt_eapol_key_data(struct wlantest *wt, const u8 *kek,
static u8 * decrypt_eapol_key_data(struct wlantest *wt, int akmp, const u8 *kek,
size_t kek_len, u16 ver,
const struct wpa_eapol_key *hdr,
size_t *len)
{
size_t mic_len;
u16 keydatalen;
const u8 *mic, *keydata;
if (kek_len != 16)
return NULL;
mic = (const u8 *) (hdr + 1);
mic_len = wpa_mic_len(akmp);
keydata = mic + mic_len + 2;
keydatalen = WPA_GET_BE16(mic + mic_len);
switch (ver) {
case WPA_KEY_INFO_TYPE_HMAC_MD5_RC4:
return decrypt_eapol_key_data_rc4(wt, kek, hdr, len);
return decrypt_eapol_key_data_rc4(wt, kek, hdr, keydata,
keydatalen, len);
case WPA_KEY_INFO_TYPE_HMAC_SHA1_AES:
case WPA_KEY_INFO_TYPE_AES_128_CMAC:
return decrypt_eapol_key_data_aes(wt, kek, hdr, len);
return decrypt_eapol_key_data_aes(wt, kek, hdr, keydata,
keydatalen, len);
case WPA_KEY_INFO_TYPE_AKM_DEFINED:
/* For now, assume this is OSEN */
return decrypt_eapol_key_data_aes(wt, kek, hdr, len);
return decrypt_eapol_key_data_aes(wt, kek, hdr, keydata,
keydatalen, len);
default:
add_note(wt, MSG_INFO,
"Unsupported EAPOL-Key Key Descriptor Version %u",
@ -544,8 +559,8 @@ static void rx_data_eapol_key_3_of_4(struct wlantest *wt, const u8 *dst,
struct wlantest_sta *sta;
const struct ieee802_1x_hdr *eapol;
const struct wpa_eapol_key *hdr;
const u8 *key_data, *kck, *kek;
size_t kck_len, kek_len;
const u8 *key_data, *kck, *kek, *mic;
size_t kck_len, kek_len, mic_len;
int recalc = 0;
u16 key_info, ver;
u8 *decrypted_buf = NULL;
@ -561,9 +576,11 @@ static void rx_data_eapol_key_3_of_4(struct wlantest *wt, const u8 *dst,
sta = sta_get(bss, dst);
if (sta == NULL)
return;
mic_len = wpa_mic_len(sta->key_mgmt);
eapol = (const struct ieee802_1x_hdr *) data;
hdr = (const struct wpa_eapol_key *) (eapol + 1);
mic = (const u8 *) (hdr + 1);
key_info = WPA_GET_BE16(hdr->key_info);
if (os_memcmp(sta->anonce, hdr->key_nonce, WPA_NONCE_LEN) != 0) {
@ -602,16 +619,17 @@ static void rx_data_eapol_key_3_of_4(struct wlantest *wt, const u8 *dst,
}
add_note(wt, MSG_DEBUG, "Valid MIC found in EAPOL-Key 3/4");
key_data = (const u8 *) (hdr + 1);
key_data = mic + mic_len + 2;
if (!(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
if (sta->proto & WPA_PROTO_RSN)
add_note(wt, MSG_INFO,
"EAPOL-Key 3/4 without EncrKeyData bit");
decrypted = key_data;
decrypted_len = WPA_GET_BE16(hdr->key_data_length);
decrypted_len = WPA_GET_BE16(mic + mic_len);
} else {
ver = key_info & WPA_KEY_INFO_TYPE_MASK;
decrypted_buf = decrypt_eapol_key_data(wt, kek, kek_len, ver,
decrypted_buf = decrypt_eapol_key_data(wt, sta->key_mgmt,
kek, kek_len, ver,
hdr, &decrypted_len);
if (decrypted_buf == NULL) {
add_note(wt, MSG_INFO,
@ -653,11 +671,12 @@ static void rx_data_eapol_key_3_of_4(struct wlantest *wt, const u8 *dst,
pos += 8;
os_memcpy(pos, eapol, sizeof(*eapol));
pos += sizeof(*eapol);
os_memcpy(pos, hdr, sizeof(*hdr));
os_memcpy(pos, hdr, sizeof(*hdr) + mic_len);
k = (struct wpa_eapol_key *) pos;
pos += sizeof(struct wpa_eapol_key) + mic_len;
WPA_PUT_BE16(k->key_info,
key_info & ~WPA_KEY_INFO_ENCR_KEY_DATA);
WPA_PUT_BE16(k->key_data_length, plain_len);
WPA_PUT_BE16(pos, plain_len);
write_pcap_decrypted(wt, buf, sizeof(buf),
decrypted, plain_len);
}
@ -770,6 +789,7 @@ static void rx_data_eapol_key_1_of_2(struct wlantest *wt, const u8 *dst,
u16 key_info, ver;
u8 *decrypted;
size_t decrypted_len = 0;
size_t mic_len;
wpa_printf(MSG_DEBUG, "EAPOL-Key 1/2 " MACSTR " -> " MACSTR,
MAC2STR(src), MAC2STR(dst));
@ -779,6 +799,7 @@ static void rx_data_eapol_key_1_of_2(struct wlantest *wt, const u8 *dst,
sta = sta_get(bss, dst);
if (sta == NULL)
return;
mic_len = wpa_mic_len(sta->key_mgmt);
eapol = (const struct ieee802_1x_hdr *) data;
hdr = (const struct wpa_eapol_key *) (eapol + 1);
@ -805,7 +826,8 @@ static void rx_data_eapol_key_1_of_2(struct wlantest *wt, const u8 *dst,
return;
}
ver = key_info & WPA_KEY_INFO_TYPE_MASK;
decrypted = decrypt_eapol_key_data(wt, sta->ptk.kek, sta->ptk.kek_len,
decrypted = decrypt_eapol_key_data(wt, sta->key_mgmt,
sta->ptk.kek, sta->ptk.kek_len,
ver, hdr, &decrypted_len);
if (decrypted == NULL) {
add_note(wt, MSG_INFO, "Failed to decrypt EAPOL-Key Key Data");
@ -843,11 +865,12 @@ static void rx_data_eapol_key_1_of_2(struct wlantest *wt, const u8 *dst,
pos += 8;
os_memcpy(pos, eapol, sizeof(*eapol));
pos += sizeof(*eapol);
os_memcpy(pos, hdr, sizeof(*hdr));
os_memcpy(pos, hdr, sizeof(*hdr) + mic_len);
k = (struct wpa_eapol_key *) pos;
pos += sizeof(struct wpa_eapol_key) + mic_len;
WPA_PUT_BE16(k->key_info,
key_info & ~WPA_KEY_INFO_ENCR_KEY_DATA);
WPA_PUT_BE16(k->key_data_length, plain_len);
WPA_PUT_BE16(pos, plain_len);
write_pcap_decrypted(wt, buf, sizeof(buf),
decrypted, plain_len);
}
@ -926,7 +949,8 @@ static void rx_data_eapol_key_2_of_2(struct wlantest *wt, const u8 *dst,
}
static void rx_data_eapol_key(struct wlantest *wt, const u8 *dst,
static void rx_data_eapol_key(struct wlantest *wt, const u8 *bssid,
const u8 *sta_addr, const u8 *dst,
const u8 *src, const u8 *data, size_t len,
int prot)
{
@ -934,17 +958,29 @@ static void rx_data_eapol_key(struct wlantest *wt, const u8 *dst,
const struct wpa_eapol_key *hdr;
const u8 *key_data;
u16 key_info, key_length, ver, key_data_length;
size_t mic_len = 16;
const u8 *mic;
struct wlantest_bss *bss;
struct wlantest_sta *sta;
bss = bss_get(wt, bssid);
if (bss) {
sta = sta_get(bss, sta_addr);
if (sta)
mic_len = wpa_mic_len(sta->key_mgmt);
}
eapol = (const struct ieee802_1x_hdr *) data;
hdr = (const struct wpa_eapol_key *) (eapol + 1);
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key",
(const u8 *) hdr, len - sizeof(*eapol));
if (len < sizeof(*hdr)) {
if (len < sizeof(*hdr) + mic_len + 2) {
add_note(wt, MSG_INFO, "Too short EAPOL-Key frame from " MACSTR,
MAC2STR(src));
return;
}
mic = (const u8 *) (hdr + 1);
if (hdr->type == EAPOL_KEY_TYPE_RC4) {
/* TODO: EAPOL-Key RC4 for WEP */
@ -962,8 +998,8 @@ static void rx_data_eapol_key(struct wlantest *wt, const u8 *dst,
key_info = WPA_GET_BE16(hdr->key_info);
key_length = WPA_GET_BE16(hdr->key_length);
key_data_length = WPA_GET_BE16(hdr->key_data_length);
key_data = (const u8 *) (hdr + 1);
key_data_length = WPA_GET_BE16(mic + mic_len);
key_data = mic + mic_len + 2;
if (key_data + key_data_length > data + len) {
add_note(wt, MSG_INFO, "Truncated EAPOL-Key from " MACSTR,
MAC2STR(src));
@ -1010,7 +1046,7 @@ static void rx_data_eapol_key(struct wlantest *wt, const u8 *dst,
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key RSC",
hdr->key_rsc, WPA_KEY_RSC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key MIC",
hdr->key_mic, 16);
mic, mic_len);
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data",
key_data, key_data_length);
@ -1120,7 +1156,8 @@ static void rx_data_eapol_key(struct wlantest *wt, const u8 *dst,
}
void rx_data_eapol(struct wlantest *wt, const u8 *dst, const u8 *src,
void rx_data_eapol(struct wlantest *wt, const u8 *bssid, const u8 *sta_addr,
const u8 *dst, const u8 *src,
const u8 *data, size_t len, int prot)
{
const struct ieee802_1x_hdr *hdr;
@ -1167,8 +1204,8 @@ void rx_data_eapol(struct wlantest *wt, const u8 *dst, const u8 *src,
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Logoff", p, length);
break;
case IEEE802_1X_TYPE_EAPOL_KEY:
rx_data_eapol_key(wt, dst, src, data, sizeof(*hdr) + length,
prot);
rx_data_eapol_key(wt, bssid, sta_addr, dst, src, data,
sizeof(*hdr) + length, prot);
break;
case IEEE802_1X_TYPE_EAPOL_ENCAPSULATED_ASF_ALERT:
wpa_hexdump(MSG_MSGDUMP, "EAPOL - Encapsulated ASF alert",

3
wlantest/wlantest.h
View file

@ -243,7 +243,8 @@ void monitor_deinit(struct wlantest *wt);
void rx_mgmt(struct wlantest *wt, const u8 *data, size_t len);
void rx_mgmt_ack(struct wlantest *wt, const struct ieee80211_hdr *hdr);
void rx_data(struct wlantest *wt, const u8 *data, size_t len);
void rx_data_eapol(struct wlantest *wt, const u8 *dst, const u8 *src,
void rx_data_eapol(struct wlantest *wt, const u8 *bssid, const u8 *sta_addr,
const u8 *dst, const u8 *src,
const u8 *data, size_t len, int prot);
void rx_data_ip(struct wlantest *wt, const u8 *bssid, const u8 *sta_addr,
const u8 *dst, const u8 *src, const u8 *data, size_t len,