1 /*
2 * WPA Supplicant - PeerKey for Direct Link Setup (DLS)
3 * Copyright (c) 2006-2008, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "includes.h"
16
17 #ifdef CONFIG_PEERKEY
18
19 #include "common.h"
20 #include "crypto/sha1.h"
21 #include "crypto/sha256.h"
22 #include "eloop.h"
23 #include "wpa.h"
24 #include "wpa_i.h"
25 #include "wpa_ie.h"
26 #include "ieee802_11_defs.h"
27 #include "peerkey.h"
28
29
wpa_add_ie(u8 * pos,const u8 * ie,size_t ie_len)30 static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len)
31 {
32 os_memcpy(pos, ie, ie_len);
33 return pos + ie_len;
34 }
35
36
wpa_add_kde(u8 * pos,u32 kde,const u8 * data,size_t data_len)37 static u8 * wpa_add_kde(u8 *pos, u32 kde, const u8 *data, size_t data_len)
38 {
39 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
40 *pos++ = RSN_SELECTOR_LEN + data_len;
41 RSN_SELECTOR_PUT(pos, kde);
42 pos += RSN_SELECTOR_LEN;
43 os_memcpy(pos, data, data_len);
44 pos += data_len;
45 return pos;
46 }
47
48
wpa_supplicant_smk_timeout(void * eloop_ctx,void * timeout_ctx)49 static void wpa_supplicant_smk_timeout(void *eloop_ctx, void *timeout_ctx)
50 {
51 #if 0
52 struct wpa_sm *sm = eloop_ctx;
53 struct wpa_peerkey *peerkey = timeout_ctx;
54 #endif
55 /* TODO: time out SMK and any STK that was generated using this SMK */
56 }
57
58
wpa_supplicant_peerkey_free(struct wpa_sm * sm,struct wpa_peerkey * peerkey)59 static void wpa_supplicant_peerkey_free(struct wpa_sm *sm,
60 struct wpa_peerkey *peerkey)
61 {
62 eloop_cancel_timeout(wpa_supplicant_smk_timeout, sm, peerkey);
63 os_free(peerkey);
64 }
65
66
wpa_supplicant_send_smk_error(struct wpa_sm * sm,const u8 * dst,const u8 * peer,u16 mui,u16 error_type,int ver)67 static int wpa_supplicant_send_smk_error(struct wpa_sm *sm, const u8 *dst,
68 const u8 *peer,
69 u16 mui, u16 error_type, int ver)
70 {
71 size_t rlen;
72 struct wpa_eapol_key *err;
73 struct rsn_error_kde error;
74 u8 *rbuf, *pos;
75 size_t kde_len;
76 u16 key_info;
77
78 kde_len = 2 + RSN_SELECTOR_LEN + sizeof(error);
79 if (peer)
80 kde_len += 2 + RSN_SELECTOR_LEN + ETH_ALEN;
81
82 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
83 NULL, sizeof(*err) + kde_len, &rlen,
84 (void *) &err);
85 if (rbuf == NULL)
86 return -1;
87
88 err->type = EAPOL_KEY_TYPE_RSN;
89 key_info = ver | WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
90 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_ERROR |
91 WPA_KEY_INFO_REQUEST;
92 WPA_PUT_BE16(err->key_info, key_info);
93 WPA_PUT_BE16(err->key_length, 0);
94 os_memcpy(err->replay_counter, sm->request_counter,
95 WPA_REPLAY_COUNTER_LEN);
96 inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
97
98 WPA_PUT_BE16(err->key_data_length, (u16) kde_len);
99 pos = (u8 *) (err + 1);
100
101 if (peer) {
102 /* Peer MAC Address KDE */
103 pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peer, ETH_ALEN);
104 }
105
106 /* Error KDE */
107 error.mui = host_to_be16(mui);
108 error.error_type = host_to_be16(error_type);
109 wpa_add_kde(pos, RSN_KEY_DATA_ERROR, (u8 *) &error, sizeof(error));
110
111 if (peer) {
112 wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK Error (peer "
113 MACSTR " mui %d error_type %d)",
114 MAC2STR(peer), mui, error_type);
115 } else {
116 wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK Error "
117 "(mui %d error_type %d)", mui, error_type);
118 }
119
120 wpa_eapol_key_send(sm, sm->ptk.kck, ver, dst, ETH_P_EAPOL,
121 rbuf, rlen, err->key_mic);
122
123 return 0;
124 }
125
126
wpa_supplicant_send_smk_m3(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,int ver,struct wpa_peerkey * peerkey)127 static int wpa_supplicant_send_smk_m3(struct wpa_sm *sm,
128 const unsigned char *src_addr,
129 const struct wpa_eapol_key *key,
130 int ver, struct wpa_peerkey *peerkey)
131 {
132 size_t rlen;
133 struct wpa_eapol_key *reply;
134 u8 *rbuf, *pos;
135 size_t kde_len;
136 u16 key_info;
137
138 /* KDEs: Peer RSN IE, Initiator MAC Address, Initiator Nonce */
139 kde_len = peerkey->rsnie_p_len +
140 2 + RSN_SELECTOR_LEN + ETH_ALEN +
141 2 + RSN_SELECTOR_LEN + WPA_NONCE_LEN;
142
143 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
144 NULL, sizeof(*reply) + kde_len, &rlen,
145 (void *) &reply);
146 if (rbuf == NULL)
147 return -1;
148
149 reply->type = EAPOL_KEY_TYPE_RSN;
150 key_info = ver | WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
151 WPA_KEY_INFO_SECURE;
152 WPA_PUT_BE16(reply->key_info, key_info);
153 WPA_PUT_BE16(reply->key_length, 0);
154 os_memcpy(reply->replay_counter, key->replay_counter,
155 WPA_REPLAY_COUNTER_LEN);
156
157 os_memcpy(reply->key_nonce, peerkey->pnonce, WPA_NONCE_LEN);
158
159 WPA_PUT_BE16(reply->key_data_length, (u16) kde_len);
160 pos = (u8 *) (reply + 1);
161
162 /* Peer RSN IE */
163 pos = wpa_add_ie(pos, peerkey->rsnie_p, peerkey->rsnie_p_len);
164
165 /* Initiator MAC Address KDE */
166 pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peerkey->addr, ETH_ALEN);
167
168 /* Initiator Nonce */
169 wpa_add_kde(pos, RSN_KEY_DATA_NONCE, peerkey->inonce, WPA_NONCE_LEN);
170
171 wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK M3");
172 wpa_eapol_key_send(sm, sm->ptk.kck, ver, src_addr, ETH_P_EAPOL,
173 rbuf, rlen, reply->key_mic);
174
175 return 0;
176 }
177
178
wpa_supplicant_process_smk_m2(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,size_t extra_len,int ver)179 static int wpa_supplicant_process_smk_m2(
180 struct wpa_sm *sm, const unsigned char *src_addr,
181 const struct wpa_eapol_key *key, size_t extra_len, int ver)
182 {
183 struct wpa_peerkey *peerkey;
184 struct wpa_eapol_ie_parse kde;
185 struct wpa_ie_data ie;
186 int cipher;
187 struct rsn_ie_hdr *hdr;
188 u8 *pos;
189
190 wpa_printf(MSG_DEBUG, "RSN: Received SMK M2");
191
192 if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) {
193 wpa_printf(MSG_INFO, "RSN: SMK handshake not allowed for "
194 "the current network");
195 return -1;
196 }
197
198 if (wpa_supplicant_parse_ies((const u8 *) (key + 1), extra_len, &kde) <
199 0) {
200 wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK M2");
201 return -1;
202 }
203
204 if (kde.rsn_ie == NULL || kde.mac_addr == NULL ||
205 kde.mac_addr_len < ETH_ALEN) {
206 wpa_printf(MSG_INFO, "RSN: No RSN IE or MAC address KDE in "
207 "SMK M2");
208 return -1;
209 }
210
211 wpa_printf(MSG_DEBUG, "RSN: SMK M2 - SMK initiator " MACSTR,
212 MAC2STR(kde.mac_addr));
213
214 if (kde.rsn_ie_len > PEERKEY_MAX_IE_LEN) {
215 wpa_printf(MSG_INFO, "RSN: Too long Initiator RSN IE in SMK "
216 "M2");
217 return -1;
218 }
219
220 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
221 wpa_printf(MSG_INFO, "RSN: Failed to parse RSN IE in SMK M2");
222 return -1;
223 }
224
225 cipher = ie.pairwise_cipher & sm->allowed_pairwise_cipher;
226 if (cipher & WPA_CIPHER_CCMP) {
227 wpa_printf(MSG_DEBUG, "RSN: Using CCMP for PeerKey");
228 cipher = WPA_CIPHER_CCMP;
229 } else if (cipher & WPA_CIPHER_TKIP) {
230 wpa_printf(MSG_DEBUG, "RSN: Using TKIP for PeerKey");
231 cipher = WPA_CIPHER_TKIP;
232 } else {
233 wpa_printf(MSG_INFO, "RSN: No acceptable cipher in SMK M2");
234 wpa_supplicant_send_smk_error(sm, src_addr, kde.mac_addr,
235 STK_MUI_SMK, STK_ERR_CPHR_NS,
236 ver);
237 return -1;
238 }
239
240 /* TODO: find existing entry and if found, use that instead of adding
241 * a new one; how to handle the case where both ends initiate at the
242 * same time? */
243 peerkey = os_zalloc(sizeof(*peerkey));
244 if (peerkey == NULL)
245 return -1;
246 os_memcpy(peerkey->addr, kde.mac_addr, ETH_ALEN);
247 os_memcpy(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN);
248 os_memcpy(peerkey->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
249 peerkey->rsnie_i_len = kde.rsn_ie_len;
250 peerkey->cipher = cipher;
251 #ifdef CONFIG_IEEE80211W
252 if (ie.key_mgmt & (WPA_KEY_MGMT_IEEE8021X_SHA256 |
253 WPA_KEY_MGMT_PSK_SHA256))
254 peerkey->use_sha256 = 1;
255 #endif /* CONFIG_IEEE80211W */
256
257 if (os_get_random(peerkey->pnonce, WPA_NONCE_LEN)) {
258 wpa_msg(sm->ctx->ctx, MSG_WARNING,
259 "WPA: Failed to get random data for PNonce");
260 wpa_supplicant_peerkey_free(sm, peerkey);
261 return -1;
262 }
263
264 hdr = (struct rsn_ie_hdr *) peerkey->rsnie_p;
265 hdr->elem_id = WLAN_EID_RSN;
266 WPA_PUT_LE16(hdr->version, RSN_VERSION);
267 pos = (u8 *) (hdr + 1);
268 /* Group Suite can be anything for SMK RSN IE; receiver will just
269 * ignore it. */
270 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
271 pos += RSN_SELECTOR_LEN;
272 /* Include only the selected cipher in pairwise cipher suite */
273 WPA_PUT_LE16(pos, 1);
274 pos += 2;
275 if (cipher == WPA_CIPHER_CCMP)
276 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
277 else if (cipher == WPA_CIPHER_TKIP)
278 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
279 pos += RSN_SELECTOR_LEN;
280
281 hdr->len = (pos - peerkey->rsnie_p) - 2;
282 peerkey->rsnie_p_len = pos - peerkey->rsnie_p;
283 wpa_hexdump(MSG_DEBUG, "WPA: RSN IE for SMK handshake",
284 peerkey->rsnie_p, peerkey->rsnie_p_len);
285
286 wpa_supplicant_send_smk_m3(sm, src_addr, key, ver, peerkey);
287
288 peerkey->next = sm->peerkey;
289 sm->peerkey = peerkey;
290
291 return 0;
292 }
293
294
295 /**
296 * rsn_smkid - Derive SMK identifier
297 * @smk: Station master key (32 bytes)
298 * @pnonce: Peer Nonce
299 * @mac_p: Peer MAC address
300 * @inonce: Initiator Nonce
301 * @mac_i: Initiator MAC address
302 * @use_sha256: Whether to use SHA256-based KDF
303 *
304 * 8.5.1.4 Station to station (STK) key hierarchy
305 * SMKID = HMAC-SHA1-128(SMK, "SMK Name" || PNonce || MAC_P || INonce || MAC_I)
306 */
rsn_smkid(const u8 * smk,const u8 * pnonce,const u8 * mac_p,const u8 * inonce,const u8 * mac_i,u8 * smkid,int use_sha256)307 static void rsn_smkid(const u8 *smk, const u8 *pnonce, const u8 *mac_p,
308 const u8 *inonce, const u8 *mac_i, u8 *smkid,
309 int use_sha256)
310 {
311 char *title = "SMK Name";
312 const u8 *addr[5];
313 const size_t len[5] = { 8, WPA_NONCE_LEN, ETH_ALEN, WPA_NONCE_LEN,
314 ETH_ALEN };
315 unsigned char hash[SHA256_MAC_LEN];
316
317 addr[0] = (u8 *) title;
318 addr[1] = pnonce;
319 addr[2] = mac_p;
320 addr[3] = inonce;
321 addr[4] = mac_i;
322
323 #ifdef CONFIG_IEEE80211W
324 if (use_sha256)
325 hmac_sha256_vector(smk, PMK_LEN, 5, addr, len, hash);
326 else
327 #endif /* CONFIG_IEEE80211W */
328 hmac_sha1_vector(smk, PMK_LEN, 5, addr, len, hash);
329 os_memcpy(smkid, hash, PMKID_LEN);
330 }
331
332
wpa_supplicant_send_stk_1_of_4(struct wpa_sm * sm,struct wpa_peerkey * peerkey)333 static void wpa_supplicant_send_stk_1_of_4(struct wpa_sm *sm,
334 struct wpa_peerkey *peerkey)
335 {
336 size_t mlen;
337 struct wpa_eapol_key *msg;
338 u8 *mbuf;
339 size_t kde_len;
340 u16 key_info, ver;
341
342 kde_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
343
344 mbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
345 sizeof(*msg) + kde_len, &mlen,
346 (void *) &msg);
347 if (mbuf == NULL)
348 return;
349
350 msg->type = EAPOL_KEY_TYPE_RSN;
351
352 if (peerkey->cipher == WPA_CIPHER_CCMP)
353 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
354 else
355 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
356
357 key_info = ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_ACK;
358 WPA_PUT_BE16(msg->key_info, key_info);
359
360 if (peerkey->cipher == WPA_CIPHER_CCMP)
361 WPA_PUT_BE16(msg->key_length, 16);
362 else
363 WPA_PUT_BE16(msg->key_length, 32);
364
365 os_memcpy(msg->replay_counter, peerkey->replay_counter,
366 WPA_REPLAY_COUNTER_LEN);
367 inc_byte_array(peerkey->replay_counter, WPA_REPLAY_COUNTER_LEN);
368
369 WPA_PUT_BE16(msg->key_data_length, kde_len);
370 wpa_add_kde((u8 *) (msg + 1), RSN_KEY_DATA_PMKID,
371 peerkey->smkid, PMKID_LEN);
372
373 if (os_get_random(peerkey->inonce, WPA_NONCE_LEN)) {
374 wpa_msg(sm->ctx->ctx, MSG_WARNING,
375 "RSN: Failed to get random data for INonce (STK)");
376 os_free(mbuf);
377 return;
378 }
379 wpa_hexdump(MSG_DEBUG, "RSN: INonce for STK 4-Way Handshake",
380 peerkey->inonce, WPA_NONCE_LEN);
381 os_memcpy(msg->key_nonce, peerkey->inonce, WPA_NONCE_LEN);
382
383 wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key STK 1/4 to " MACSTR,
384 MAC2STR(peerkey->addr));
385 wpa_eapol_key_send(sm, NULL, ver, peerkey->addr, ETH_P_EAPOL,
386 mbuf, mlen, NULL);
387 }
388
389
wpa_supplicant_send_stk_3_of_4(struct wpa_sm * sm,struct wpa_peerkey * peerkey)390 static void wpa_supplicant_send_stk_3_of_4(struct wpa_sm *sm,
391 struct wpa_peerkey *peerkey)
392 {
393 size_t mlen;
394 struct wpa_eapol_key *msg;
395 u8 *mbuf, *pos;
396 size_t kde_len;
397 u16 key_info, ver;
398 be32 lifetime;
399
400 kde_len = peerkey->rsnie_i_len +
401 2 + RSN_SELECTOR_LEN + sizeof(lifetime);
402
403 mbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
404 sizeof(*msg) + kde_len, &mlen,
405 (void *) &msg);
406 if (mbuf == NULL)
407 return;
408
409 msg->type = EAPOL_KEY_TYPE_RSN;
410
411 if (peerkey->cipher == WPA_CIPHER_CCMP)
412 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
413 else
414 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
415
416 key_info = ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_ACK |
417 WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE;
418 WPA_PUT_BE16(msg->key_info, key_info);
419
420 if (peerkey->cipher == WPA_CIPHER_CCMP)
421 WPA_PUT_BE16(msg->key_length, 16);
422 else
423 WPA_PUT_BE16(msg->key_length, 32);
424
425 os_memcpy(msg->replay_counter, peerkey->replay_counter,
426 WPA_REPLAY_COUNTER_LEN);
427 inc_byte_array(peerkey->replay_counter, WPA_REPLAY_COUNTER_LEN);
428
429 WPA_PUT_BE16(msg->key_data_length, kde_len);
430 pos = (u8 *) (msg + 1);
431 pos = wpa_add_ie(pos, peerkey->rsnie_i, peerkey->rsnie_i_len);
432 lifetime = host_to_be32(peerkey->lifetime);
433 wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME,
434 (u8 *) &lifetime, sizeof(lifetime));
435
436 os_memcpy(msg->key_nonce, peerkey->inonce, WPA_NONCE_LEN);
437
438 wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key STK 3/4 to " MACSTR,
439 MAC2STR(peerkey->addr));
440 wpa_eapol_key_send(sm, peerkey->stk.kck, ver, peerkey->addr,
441 ETH_P_EAPOL, mbuf, mlen, msg->key_mic);
442 }
443
444
wpa_supplicant_process_smk_m4(struct wpa_peerkey * peerkey,struct wpa_eapol_ie_parse * kde)445 static int wpa_supplicant_process_smk_m4(struct wpa_peerkey *peerkey,
446 struct wpa_eapol_ie_parse *kde)
447 {
448 wpa_printf(MSG_DEBUG, "RSN: Received SMK M4 (Initiator " MACSTR ")",
449 MAC2STR(kde->mac_addr));
450
451 if (os_memcmp(kde->smk + PMK_LEN, peerkey->pnonce, WPA_NONCE_LEN) != 0)
452 {
453 wpa_printf(MSG_INFO, "RSN: PNonce in SMK KDE does not "
454 "match with the one used in SMK M3");
455 return -1;
456 }
457
458 if (os_memcmp(kde->nonce, peerkey->inonce, WPA_NONCE_LEN) != 0) {
459 wpa_printf(MSG_INFO, "RSN: INonce in SMK M4 did not "
460 "match with the one received in SMK M2");
461 return -1;
462 }
463
464 return 0;
465 }
466
467
wpa_supplicant_process_smk_m5(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,int ver,struct wpa_peerkey * peerkey,struct wpa_eapol_ie_parse * kde)468 static int wpa_supplicant_process_smk_m5(struct wpa_sm *sm,
469 const unsigned char *src_addr,
470 const struct wpa_eapol_key *key,
471 int ver,
472 struct wpa_peerkey *peerkey,
473 struct wpa_eapol_ie_parse *kde)
474 {
475 int cipher;
476 struct wpa_ie_data ie;
477
478 wpa_printf(MSG_DEBUG, "RSN: Received SMK M5 (Peer " MACSTR ")",
479 MAC2STR(kde->mac_addr));
480 if (kde->rsn_ie == NULL || kde->rsn_ie_len > PEERKEY_MAX_IE_LEN ||
481 wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0) {
482 wpa_printf(MSG_INFO, "RSN: No RSN IE in SMK M5");
483 /* TODO: abort negotiation */
484 return -1;
485 }
486
487 if (os_memcmp(key->key_nonce, peerkey->inonce, WPA_NONCE_LEN) != 0) {
488 wpa_printf(MSG_INFO, "RSN: Key Nonce in SMK M5 does "
489 "not match with INonce used in SMK M1");
490 return -1;
491 }
492
493 if (os_memcmp(kde->smk + PMK_LEN, peerkey->inonce, WPA_NONCE_LEN) != 0)
494 {
495 wpa_printf(MSG_INFO, "RSN: INonce in SMK KDE does not "
496 "match with the one used in SMK M1");
497 return -1;
498 }
499
500 os_memcpy(peerkey->rsnie_p, kde->rsn_ie, kde->rsn_ie_len);
501 peerkey->rsnie_p_len = kde->rsn_ie_len;
502 os_memcpy(peerkey->pnonce, kde->nonce, WPA_NONCE_LEN);
503
504 cipher = ie.pairwise_cipher & sm->allowed_pairwise_cipher;
505 if (cipher & WPA_CIPHER_CCMP) {
506 wpa_printf(MSG_DEBUG, "RSN: Using CCMP for PeerKey");
507 peerkey->cipher = WPA_CIPHER_CCMP;
508 } else if (cipher & WPA_CIPHER_TKIP) {
509 wpa_printf(MSG_DEBUG, "RSN: Using TKIP for PeerKey");
510 peerkey->cipher = WPA_CIPHER_TKIP;
511 } else {
512 wpa_printf(MSG_INFO, "RSN: SMK Peer STA " MACSTR " selected "
513 "unacceptable cipher", MAC2STR(kde->mac_addr));
514 wpa_supplicant_send_smk_error(sm, src_addr, kde->mac_addr,
515 STK_MUI_SMK, STK_ERR_CPHR_NS,
516 ver);
517 /* TODO: abort negotiation */
518 return -1;
519 }
520
521 return 0;
522 }
523
524
wpa_supplicant_process_smk_m45(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,size_t extra_len,int ver)525 static int wpa_supplicant_process_smk_m45(
526 struct wpa_sm *sm, const unsigned char *src_addr,
527 const struct wpa_eapol_key *key, size_t extra_len, int ver)
528 {
529 struct wpa_peerkey *peerkey;
530 struct wpa_eapol_ie_parse kde;
531 u32 lifetime;
532 struct os_time now;
533
534 if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) {
535 wpa_printf(MSG_DEBUG, "RSN: SMK handshake not allowed for "
536 "the current network");
537 return -1;
538 }
539
540 if (wpa_supplicant_parse_ies((const u8 *) (key + 1), extra_len, &kde) <
541 0) {
542 wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK M4/M5");
543 return -1;
544 }
545
546 if (kde.mac_addr == NULL || kde.mac_addr_len < ETH_ALEN ||
547 kde.nonce == NULL || kde.nonce_len < WPA_NONCE_LEN ||
548 kde.smk == NULL || kde.smk_len < PMK_LEN + WPA_NONCE_LEN ||
549 kde.lifetime == NULL || kde.lifetime_len < 4) {
550 wpa_printf(MSG_INFO, "RSN: No MAC Address, Nonce, SMK, or "
551 "Lifetime KDE in SMK M4/M5");
552 return -1;
553 }
554
555 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
556 if (os_memcmp(peerkey->addr, kde.mac_addr, ETH_ALEN) == 0 &&
557 os_memcmp(peerkey->initiator ? peerkey->inonce :
558 peerkey->pnonce,
559 key->key_nonce, WPA_NONCE_LEN) == 0)
560 break;
561 }
562 if (peerkey == NULL) {
563 wpa_printf(MSG_INFO, "RSN: No matching SMK handshake found "
564 "for SMK M4/M5: peer " MACSTR,
565 MAC2STR(kde.mac_addr));
566 return -1;
567 }
568
569 if (peerkey->initiator) {
570 if (wpa_supplicant_process_smk_m5(sm, src_addr, key, ver,
571 peerkey, &kde) < 0)
572 return -1;
573 } else {
574 if (wpa_supplicant_process_smk_m4(peerkey, &kde) < 0)
575 return -1;
576 }
577
578 os_memcpy(peerkey->smk, kde.smk, PMK_LEN);
579 peerkey->smk_complete = 1;
580 wpa_hexdump_key(MSG_DEBUG, "RSN: SMK", peerkey->smk, PMK_LEN);
581 lifetime = WPA_GET_BE32(kde.lifetime);
582 wpa_printf(MSG_DEBUG, "RSN: SMK lifetime %u seconds", lifetime);
583 if (lifetime > 1000000000)
584 lifetime = 1000000000; /* avoid overflowing expiration time */
585 peerkey->lifetime = lifetime;
586 os_get_time(&now);
587 peerkey->expiration = now.sec + lifetime;
588 eloop_register_timeout(lifetime, 0, wpa_supplicant_smk_timeout,
589 sm, peerkey);
590
591 if (peerkey->initiator) {
592 rsn_smkid(peerkey->smk, peerkey->pnonce, peerkey->addr,
593 peerkey->inonce, sm->own_addr, peerkey->smkid,
594 peerkey->use_sha256);
595 wpa_supplicant_send_stk_1_of_4(sm, peerkey);
596 } else {
597 rsn_smkid(peerkey->smk, peerkey->pnonce, sm->own_addr,
598 peerkey->inonce, peerkey->addr, peerkey->smkid,
599 peerkey->use_sha256);
600 }
601 wpa_hexdump(MSG_DEBUG, "RSN: SMKID", peerkey->smkid, PMKID_LEN);
602
603 return 0;
604 }
605
606
wpa_supplicant_process_smk_error(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,size_t extra_len)607 static int wpa_supplicant_process_smk_error(
608 struct wpa_sm *sm, const unsigned char *src_addr,
609 const struct wpa_eapol_key *key, size_t extra_len)
610 {
611 struct wpa_eapol_ie_parse kde;
612 struct rsn_error_kde error;
613 u8 peer[ETH_ALEN];
614 u16 error_type;
615
616 wpa_printf(MSG_DEBUG, "RSN: Received SMK Error");
617
618 if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) {
619 wpa_printf(MSG_DEBUG, "RSN: SMK handshake not allowed for "
620 "the current network");
621 return -1;
622 }
623
624 if (wpa_supplicant_parse_ies((const u8 *) (key + 1), extra_len, &kde) <
625 0) {
626 wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK Error");
627 return -1;
628 }
629
630 if (kde.error == NULL || kde.error_len < sizeof(error)) {
631 wpa_printf(MSG_INFO, "RSN: No Error KDE in SMK Error");
632 return -1;
633 }
634
635 if (kde.mac_addr && kde.mac_addr_len >= ETH_ALEN)
636 os_memcpy(peer, kde.mac_addr, ETH_ALEN);
637 os_memcpy(&error, kde.error, sizeof(error));
638 error_type = be_to_host16(error.error_type);
639 wpa_msg(sm->ctx->ctx, MSG_INFO,
640 "RSN: SMK Error KDE received: MUI %d error_type %d peer "
641 MACSTR,
642 be_to_host16(error.mui), error_type,
643 MAC2STR(peer));
644
645 if (kde.mac_addr &&
646 (error_type == STK_ERR_STA_NR || error_type == STK_ERR_STA_NRSN ||
647 error_type == STK_ERR_CPHR_NS)) {
648 struct wpa_peerkey *peerkey;
649
650 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
651 if (os_memcmp(peerkey->addr, kde.mac_addr, ETH_ALEN) ==
652 0)
653 break;
654 }
655 if (peerkey == NULL) {
656 wpa_printf(MSG_DEBUG, "RSN: No matching SMK handshake "
657 "found for SMK Error");
658 return -1;
659 }
660 /* TODO: abort SMK/STK handshake and remove all related keys */
661 }
662
663 return 0;
664 }
665
666
wpa_supplicant_process_stk_1_of_4(struct wpa_sm * sm,struct wpa_peerkey * peerkey,const struct wpa_eapol_key * key,u16 ver)667 static void wpa_supplicant_process_stk_1_of_4(struct wpa_sm *sm,
668 struct wpa_peerkey *peerkey,
669 const struct wpa_eapol_key *key,
670 u16 ver)
671 {
672 struct wpa_eapol_ie_parse ie;
673 const u8 *kde;
674 size_t len, kde_buf_len;
675 struct wpa_ptk *stk;
676 u8 buf[8], *kde_buf, *pos;
677 be32 lifetime;
678
679 wpa_printf(MSG_DEBUG, "RSN: RX message 1 of STK 4-Way Handshake from "
680 MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
681
682 os_memset(&ie, 0, sizeof(ie));
683
684 /* RSN: msg 1/4 should contain SMKID for the selected SMK */
685 kde = (const u8 *) (key + 1);
686 len = WPA_GET_BE16(key->key_data_length);
687 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", kde, len);
688 if (wpa_supplicant_parse_ies(kde, len, &ie) < 0 || ie.pmkid == NULL) {
689 wpa_printf(MSG_DEBUG, "RSN: No SMKID in STK 1/4");
690 return;
691 }
692 if (os_memcmp(ie.pmkid, peerkey->smkid, PMKID_LEN) != 0) {
693 wpa_hexdump(MSG_DEBUG, "RSN: Unknown SMKID in STK 1/4",
694 ie.pmkid, PMKID_LEN);
695 return;
696 }
697
698 if (os_get_random(peerkey->pnonce, WPA_NONCE_LEN)) {
699 wpa_msg(sm->ctx->ctx, MSG_WARNING,
700 "RSN: Failed to get random data for PNonce");
701 return;
702 }
703 wpa_hexdump(MSG_DEBUG, "WPA: Renewed PNonce",
704 peerkey->pnonce, WPA_NONCE_LEN);
705
706 /* Calculate STK which will be stored as a temporary STK until it has
707 * been verified when processing message 3/4. */
708 stk = &peerkey->tstk;
709 wpa_pmk_to_ptk(peerkey->smk, PMK_LEN, "Peer key expansion",
710 sm->own_addr, peerkey->addr,
711 peerkey->pnonce, key->key_nonce,
712 (u8 *) stk, sizeof(*stk),
713 peerkey->use_sha256);
714 /* Supplicant: swap tx/rx Mic keys */
715 os_memcpy(buf, stk->u.auth.tx_mic_key, 8);
716 os_memcpy(stk->u.auth.tx_mic_key, stk->u.auth.rx_mic_key, 8);
717 os_memcpy(stk->u.auth.rx_mic_key, buf, 8);
718 peerkey->tstk_set = 1;
719
720 kde_buf_len = peerkey->rsnie_p_len +
721 2 + RSN_SELECTOR_LEN + sizeof(lifetime) +
722 2 + RSN_SELECTOR_LEN + PMKID_LEN;
723 kde_buf = os_malloc(kde_buf_len);
724 if (kde_buf == NULL)
725 return;
726 pos = kde_buf;
727 pos = wpa_add_ie(pos, peerkey->rsnie_p, peerkey->rsnie_p_len);
728 lifetime = host_to_be32(peerkey->lifetime);
729 pos = wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME,
730 (u8 *) &lifetime, sizeof(lifetime));
731 wpa_add_kde(pos, RSN_KEY_DATA_PMKID, peerkey->smkid, PMKID_LEN);
732
733 if (wpa_supplicant_send_2_of_4(sm, peerkey->addr, key, ver,
734 peerkey->pnonce, kde_buf, kde_buf_len,
735 stk)) {
736 os_free(kde_buf);
737 return;
738 }
739 os_free(kde_buf);
740
741 os_memcpy(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN);
742 }
743
744
wpa_supplicant_update_smk_lifetime(struct wpa_sm * sm,struct wpa_peerkey * peerkey,struct wpa_eapol_ie_parse * kde)745 static void wpa_supplicant_update_smk_lifetime(struct wpa_sm *sm,
746 struct wpa_peerkey *peerkey,
747 struct wpa_eapol_ie_parse *kde)
748 {
749 u32 lifetime;
750 struct os_time now;
751
752 if (kde->lifetime == NULL || kde->lifetime_len < sizeof(lifetime))
753 return;
754
755 lifetime = WPA_GET_BE32(kde->lifetime);
756
757 if (lifetime >= peerkey->lifetime) {
758 wpa_printf(MSG_DEBUG, "RSN: Peer used SMK lifetime %u seconds "
759 "which is larger than or equal to own value %u "
760 "seconds - ignored", lifetime, peerkey->lifetime);
761 return;
762 }
763
764 wpa_printf(MSG_DEBUG, "RSN: Peer used shorter SMK lifetime %u seconds "
765 "(own was %u seconds) - updated",
766 lifetime, peerkey->lifetime);
767 peerkey->lifetime = lifetime;
768
769 os_get_time(&now);
770 peerkey->expiration = now.sec + lifetime;
771 eloop_cancel_timeout(wpa_supplicant_smk_timeout, sm, peerkey);
772 eloop_register_timeout(lifetime, 0, wpa_supplicant_smk_timeout,
773 sm, peerkey);
774 }
775
776
wpa_supplicant_process_stk_2_of_4(struct wpa_sm * sm,struct wpa_peerkey * peerkey,const struct wpa_eapol_key * key,u16 ver)777 static void wpa_supplicant_process_stk_2_of_4(struct wpa_sm *sm,
778 struct wpa_peerkey *peerkey,
779 const struct wpa_eapol_key *key,
780 u16 ver)
781 {
782 struct wpa_eapol_ie_parse kde;
783 const u8 *keydata;
784 size_t len;
785
786 wpa_printf(MSG_DEBUG, "RSN: RX message 2 of STK 4-Way Handshake from "
787 MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
788
789 os_memset(&kde, 0, sizeof(kde));
790
791 /* RSN: msg 2/4 should contain SMKID for the selected SMK and RSN IE
792 * from the peer. It may also include Lifetime KDE. */
793 keydata = (const u8 *) (key + 1);
794 len = WPA_GET_BE16(key->key_data_length);
795 wpa_hexdump(MSG_DEBUG, "RSN: msg 2/4 key data", keydata, len);
796 if (wpa_supplicant_parse_ies(keydata, len, &kde) < 0 ||
797 kde.pmkid == NULL || kde.rsn_ie == NULL) {
798 wpa_printf(MSG_DEBUG, "RSN: No SMKID or RSN IE in STK 2/4");
799 return;
800 }
801
802 if (os_memcmp(kde.pmkid, peerkey->smkid, PMKID_LEN) != 0) {
803 wpa_hexdump(MSG_DEBUG, "RSN: Unknown SMKID in STK 2/4",
804 kde.pmkid, PMKID_LEN);
805 return;
806 }
807
808 if (kde.rsn_ie_len != peerkey->rsnie_p_len ||
809 os_memcmp(kde.rsn_ie, peerkey->rsnie_p, kde.rsn_ie_len) != 0) {
810 wpa_printf(MSG_INFO, "RSN: Peer RSN IE in SMK and STK "
811 "handshakes did not match");
812 wpa_hexdump(MSG_DEBUG, "RSN: Peer RSN IE in SMK handshake",
813 peerkey->rsnie_p, peerkey->rsnie_p_len);
814 wpa_hexdump(MSG_DEBUG, "RSN: Peer RSN IE in STK handshake",
815 kde.rsn_ie, kde.rsn_ie_len);
816 return;
817 }
818
819 wpa_supplicant_update_smk_lifetime(sm, peerkey, &kde);
820
821 wpa_supplicant_send_stk_3_of_4(sm, peerkey);
822 os_memcpy(peerkey->pnonce, key->key_nonce, WPA_NONCE_LEN);
823 }
824
825
wpa_supplicant_process_stk_3_of_4(struct wpa_sm * sm,struct wpa_peerkey * peerkey,const struct wpa_eapol_key * key,u16 ver)826 static void wpa_supplicant_process_stk_3_of_4(struct wpa_sm *sm,
827 struct wpa_peerkey *peerkey,
828 const struct wpa_eapol_key *key,
829 u16 ver)
830 {
831 struct wpa_eapol_ie_parse kde;
832 const u8 *keydata;
833 size_t len, key_len;
834 const u8 *_key;
835 u8 key_buf[32], rsc[6];
836
837 wpa_printf(MSG_DEBUG, "RSN: RX message 3 of STK 4-Way Handshake from "
838 MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
839
840 os_memset(&kde, 0, sizeof(kde));
841
842 /* RSN: msg 3/4 should contain Initiator RSN IE. It may also include
843 * Lifetime KDE. */
844 keydata = (const u8 *) (key + 1);
845 len = WPA_GET_BE16(key->key_data_length);
846 wpa_hexdump(MSG_DEBUG, "RSN: msg 3/4 key data", keydata, len);
847 if (wpa_supplicant_parse_ies(keydata, len, &kde) < 0) {
848 wpa_printf(MSG_DEBUG, "RSN: Failed to parse key data in "
849 "STK 3/4");
850 return;
851 }
852
853 if (kde.rsn_ie_len != peerkey->rsnie_i_len ||
854 os_memcmp(kde.rsn_ie, peerkey->rsnie_i, kde.rsn_ie_len) != 0) {
855 wpa_printf(MSG_INFO, "RSN: Initiator RSN IE in SMK and STK "
856 "handshakes did not match");
857 wpa_hexdump(MSG_DEBUG, "RSN: Initiator RSN IE in SMK "
858 "handshake",
859 peerkey->rsnie_i, peerkey->rsnie_i_len);
860 wpa_hexdump(MSG_DEBUG, "RSN: Initiator RSN IE in STK "
861 "handshake",
862 kde.rsn_ie, kde.rsn_ie_len);
863 return;
864 }
865
866 if (os_memcmp(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN) != 0) {
867 wpa_printf(MSG_WARNING, "RSN: INonce from message 1 of STK "
868 "4-Way Handshake differs from 3 of STK 4-Way "
869 "Handshake - drop packet (src=" MACSTR ")",
870 MAC2STR(peerkey->addr));
871 return;
872 }
873
874 wpa_supplicant_update_smk_lifetime(sm, peerkey, &kde);
875
876 if (wpa_supplicant_send_4_of_4(sm, peerkey->addr, key, ver,
877 WPA_GET_BE16(key->key_info),
878 NULL, 0, &peerkey->stk))
879 return;
880
881 _key = (u8 *) peerkey->stk.tk1;
882 if (peerkey->cipher == WPA_CIPHER_TKIP) {
883 /* Swap Tx/Rx keys for Michael MIC */
884 os_memcpy(key_buf, _key, 16);
885 os_memcpy(key_buf + 16, peerkey->stk.u.auth.rx_mic_key, 8);
886 os_memcpy(key_buf + 24, peerkey->stk.u.auth.tx_mic_key, 8);
887 _key = key_buf;
888 key_len = 32;
889 } else
890 key_len = 16;
891
892 os_memset(rsc, 0, 6);
893 if (wpa_sm_set_key(sm, peerkey->cipher, peerkey->addr, 0, 1,
894 rsc, sizeof(rsc), _key, key_len) < 0) {
895 wpa_printf(MSG_WARNING, "RSN: Failed to set STK to the "
896 "driver.");
897 return;
898 }
899 }
900
901
wpa_supplicant_process_stk_4_of_4(struct wpa_sm * sm,struct wpa_peerkey * peerkey,const struct wpa_eapol_key * key,u16 ver)902 static void wpa_supplicant_process_stk_4_of_4(struct wpa_sm *sm,
903 struct wpa_peerkey *peerkey,
904 const struct wpa_eapol_key *key,
905 u16 ver)
906 {
907 u8 rsc[6];
908
909 wpa_printf(MSG_DEBUG, "RSN: RX message 4 of STK 4-Way Handshake from "
910 MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
911
912 os_memset(rsc, 0, 6);
913 if (wpa_sm_set_key(sm, peerkey->cipher, peerkey->addr, 0, 1,
914 rsc, sizeof(rsc), (u8 *) peerkey->stk.tk1,
915 peerkey->cipher == WPA_CIPHER_TKIP ? 32 : 16) < 0) {
916 wpa_printf(MSG_WARNING, "RSN: Failed to set STK to the "
917 "driver.");
918 return;
919 }
920 }
921
922
923 /**
924 * peerkey_verify_eapol_key_mic - Verify PeerKey MIC
925 * @sm: Pointer to WPA state machine data from wpa_sm_init()
926 * @peerkey: Pointer to the PeerKey data for the peer
927 * @key: Pointer to the EAPOL-Key frame header
928 * @ver: Version bits from EAPOL-Key Key Info
929 * @buf: Pointer to the beginning of EAPOL-Key frame
930 * @len: Length of the EAPOL-Key frame
931 * Returns: 0 on success, -1 on failure
932 */
peerkey_verify_eapol_key_mic(struct wpa_sm * sm,struct wpa_peerkey * peerkey,struct wpa_eapol_key * key,u16 ver,const u8 * buf,size_t len)933 int peerkey_verify_eapol_key_mic(struct wpa_sm *sm,
934 struct wpa_peerkey *peerkey,
935 struct wpa_eapol_key *key, u16 ver,
936 const u8 *buf, size_t len)
937 {
938 u8 mic[16];
939 int ok = 0;
940
941 if (peerkey->initiator && !peerkey->stk_set) {
942 wpa_pmk_to_ptk(peerkey->smk, PMK_LEN, "Peer key expansion",
943 sm->own_addr, peerkey->addr,
944 peerkey->inonce, key->key_nonce,
945 (u8 *) &peerkey->stk, sizeof(peerkey->stk),
946 peerkey->use_sha256);
947 peerkey->stk_set = 1;
948 }
949
950 os_memcpy(mic, key->key_mic, 16);
951 if (peerkey->tstk_set) {
952 os_memset(key->key_mic, 0, 16);
953 wpa_eapol_key_mic(peerkey->tstk.kck, ver, buf, len,
954 key->key_mic);
955 if (os_memcmp(mic, key->key_mic, 16) != 0) {
956 wpa_printf(MSG_WARNING, "RSN: Invalid EAPOL-Key MIC "
957 "when using TSTK - ignoring TSTK");
958 } else {
959 ok = 1;
960 peerkey->tstk_set = 0;
961 peerkey->stk_set = 1;
962 os_memcpy(&peerkey->stk, &peerkey->tstk,
963 sizeof(peerkey->stk));
964 }
965 }
966
967 if (!ok && peerkey->stk_set) {
968 os_memset(key->key_mic, 0, 16);
969 wpa_eapol_key_mic(peerkey->stk.kck, ver, buf, len,
970 key->key_mic);
971 if (os_memcmp(mic, key->key_mic, 16) != 0) {
972 wpa_printf(MSG_WARNING, "RSN: Invalid EAPOL-Key MIC "
973 "- dropping packet");
974 return -1;
975 }
976 ok = 1;
977 }
978
979 if (!ok) {
980 wpa_printf(MSG_WARNING, "RSN: Could not verify EAPOL-Key MIC "
981 "- dropping packet");
982 return -1;
983 }
984
985 os_memcpy(peerkey->replay_counter, key->replay_counter,
986 WPA_REPLAY_COUNTER_LEN);
987 peerkey->replay_counter_set = 1;
988 return 0;
989 }
990
991
992 /**
993 * wpa_sm_stkstart - Send EAPOL-Key Request for STK handshake (STK M1)
994 * @sm: Pointer to WPA state machine data from wpa_sm_init()
995 * @peer: MAC address of the peer STA
996 * Returns: 0 on success, or -1 on failure
997 *
998 * Send an EAPOL-Key Request to the current authenticator to start STK
999 * handshake with the peer.
1000 */
wpa_sm_stkstart(struct wpa_sm * sm,const u8 * peer)1001 int wpa_sm_stkstart(struct wpa_sm *sm, const u8 *peer)
1002 {
1003 size_t rlen, kde_len;
1004 struct wpa_eapol_key *req;
1005 int key_info, ver;
1006 u8 bssid[ETH_ALEN], *rbuf, *pos, *count_pos;
1007 u16 count;
1008 struct rsn_ie_hdr *hdr;
1009 struct wpa_peerkey *peerkey;
1010 struct wpa_ie_data ie;
1011
1012 if (sm->proto != WPA_PROTO_RSN || !sm->ptk_set || !sm->peerkey_enabled)
1013 return -1;
1014
1015 if (sm->ap_rsn_ie &&
1016 wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &ie) == 0 &&
1017 !(ie.capabilities & WPA_CAPABILITY_PEERKEY_ENABLED)) {
1018 wpa_printf(MSG_DEBUG, "RSN: Current AP does not support STK");
1019 return -1;
1020 }
1021
1022 if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
1023 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1024 else
1025 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1026
1027 if (wpa_sm_get_bssid(sm, bssid) < 0) {
1028 wpa_printf(MSG_WARNING, "Failed to read BSSID for EAPOL-Key "
1029 "SMK M1");
1030 return -1;
1031 }
1032
1033 /* TODO: find existing entry and if found, use that instead of adding
1034 * a new one */
1035 peerkey = os_zalloc(sizeof(*peerkey));
1036 if (peerkey == NULL)
1037 return -1;
1038 peerkey->initiator = 1;
1039 os_memcpy(peerkey->addr, peer, ETH_ALEN);
1040 #ifdef CONFIG_IEEE80211W
1041 if (wpa_key_mgmt_sha256(sm->key_mgmt))
1042 peerkey->use_sha256 = 1;
1043 #endif /* CONFIG_IEEE80211W */
1044
1045 /* SMK M1:
1046 * EAPOL-Key(S=1, M=1, A=0, I=0, K=0, SM=1, KeyRSC=0, Nonce=INonce,
1047 * MIC=MIC, DataKDs=(RSNIE_I, MAC_P KDE))
1048 */
1049
1050 hdr = (struct rsn_ie_hdr *) peerkey->rsnie_i;
1051 hdr->elem_id = WLAN_EID_RSN;
1052 WPA_PUT_LE16(hdr->version, RSN_VERSION);
1053 pos = (u8 *) (hdr + 1);
1054 /* Group Suite can be anything for SMK RSN IE; receiver will just
1055 * ignore it. */
1056 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1057 pos += RSN_SELECTOR_LEN;
1058 count_pos = pos;
1059 pos += 2;
1060
1061 count = 0;
1062 if (sm->allowed_pairwise_cipher & WPA_CIPHER_CCMP) {
1063 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1064 pos += RSN_SELECTOR_LEN;
1065 count++;
1066 }
1067 if (sm->allowed_pairwise_cipher & WPA_CIPHER_TKIP) {
1068 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
1069 pos += RSN_SELECTOR_LEN;
1070 count++;
1071 }
1072 WPA_PUT_LE16(count_pos, count);
1073
1074 hdr->len = (pos - peerkey->rsnie_i) - 2;
1075 peerkey->rsnie_i_len = pos - peerkey->rsnie_i;
1076 wpa_hexdump(MSG_DEBUG, "WPA: RSN IE for SMK handshake",
1077 peerkey->rsnie_i, peerkey->rsnie_i_len);
1078
1079 kde_len = peerkey->rsnie_i_len + 2 + RSN_SELECTOR_LEN + ETH_ALEN;
1080
1081 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1082 sizeof(*req) + kde_len, &rlen,
1083 (void *) &req);
1084 if (rbuf == NULL) {
1085 wpa_supplicant_peerkey_free(sm, peerkey);
1086 return -1;
1087 }
1088
1089 req->type = EAPOL_KEY_TYPE_RSN;
1090 key_info = WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
1091 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_REQUEST | ver;
1092 WPA_PUT_BE16(req->key_info, key_info);
1093 WPA_PUT_BE16(req->key_length, 0);
1094 os_memcpy(req->replay_counter, sm->request_counter,
1095 WPA_REPLAY_COUNTER_LEN);
1096 inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
1097
1098 if (os_get_random(peerkey->inonce, WPA_NONCE_LEN)) {
1099 wpa_msg(sm->ctx->ctx, MSG_WARNING,
1100 "WPA: Failed to get random data for INonce");
1101 os_free(rbuf);
1102 wpa_supplicant_peerkey_free(sm, peerkey);
1103 return -1;
1104 }
1105 os_memcpy(req->key_nonce, peerkey->inonce, WPA_NONCE_LEN);
1106 wpa_hexdump(MSG_DEBUG, "WPA: INonce for SMK handshake",
1107 req->key_nonce, WPA_NONCE_LEN);
1108
1109 WPA_PUT_BE16(req->key_data_length, (u16) kde_len);
1110 pos = (u8 *) (req + 1);
1111
1112 /* Initiator RSN IE */
1113 pos = wpa_add_ie(pos, peerkey->rsnie_i, peerkey->rsnie_i_len);
1114 /* Peer MAC address KDE */
1115 wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peer, ETH_ALEN);
1116
1117 wpa_printf(MSG_INFO, "RSN: Sending EAPOL-Key SMK M1 Request (peer "
1118 MACSTR ")", MAC2STR(peer));
1119 wpa_eapol_key_send(sm, sm->ptk.kck, ver, bssid, ETH_P_EAPOL,
1120 rbuf, rlen, req->key_mic);
1121
1122 peerkey->next = sm->peerkey;
1123 sm->peerkey = peerkey;
1124
1125 return 0;
1126 }
1127
1128
1129 /**
1130 * peerkey_deinit - Free PeerKey values
1131 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1132 */
peerkey_deinit(struct wpa_sm * sm)1133 void peerkey_deinit(struct wpa_sm *sm)
1134 {
1135 struct wpa_peerkey *prev, *peerkey = sm->peerkey;
1136 while (peerkey) {
1137 prev = peerkey;
1138 peerkey = peerkey->next;
1139 os_free(prev);
1140 }
1141 }
1142
1143
peerkey_rx_eapol_4way(struct wpa_sm * sm,struct wpa_peerkey * peerkey,struct wpa_eapol_key * key,u16 key_info,u16 ver)1144 void peerkey_rx_eapol_4way(struct wpa_sm *sm, struct wpa_peerkey *peerkey,
1145 struct wpa_eapol_key *key, u16 key_info, u16 ver)
1146 {
1147 if ((key_info & (WPA_KEY_INFO_MIC | WPA_KEY_INFO_ACK)) ==
1148 (WPA_KEY_INFO_MIC | WPA_KEY_INFO_ACK)) {
1149 /* 3/4 STK 4-Way Handshake */
1150 wpa_supplicant_process_stk_3_of_4(sm, peerkey, key, ver);
1151 } else if (key_info & WPA_KEY_INFO_ACK) {
1152 /* 1/4 STK 4-Way Handshake */
1153 wpa_supplicant_process_stk_1_of_4(sm, peerkey, key, ver);
1154 } else if (key_info & WPA_KEY_INFO_SECURE) {
1155 /* 4/4 STK 4-Way Handshake */
1156 wpa_supplicant_process_stk_4_of_4(sm, peerkey, key, ver);
1157 } else {
1158 /* 2/4 STK 4-Way Handshake */
1159 wpa_supplicant_process_stk_2_of_4(sm, peerkey, key, ver);
1160 }
1161 }
1162
1163
peerkey_rx_eapol_smk(struct wpa_sm * sm,const u8 * src_addr,struct wpa_eapol_key * key,size_t extra_len,u16 key_info,u16 ver)1164 void peerkey_rx_eapol_smk(struct wpa_sm *sm, const u8 *src_addr,
1165 struct wpa_eapol_key *key, size_t extra_len,
1166 u16 key_info, u16 ver)
1167 {
1168 if (key_info & WPA_KEY_INFO_ERROR) {
1169 /* SMK Error */
1170 wpa_supplicant_process_smk_error(sm, src_addr, key, extra_len);
1171 } else if (key_info & WPA_KEY_INFO_ACK) {
1172 /* SMK M2 */
1173 wpa_supplicant_process_smk_m2(sm, src_addr, key, extra_len,
1174 ver);
1175 } else {
1176 /* SMK M4 or M5 */
1177 wpa_supplicant_process_smk_m45(sm, src_addr, key, extra_len,
1178 ver);
1179 }
1180 }
1181
1182 #endif /* CONFIG_PEERKEY */
1183