Line data Source code
1 : /*
2 : * WPA Supplicant - PeerKey for Direct Link Setup (DLS)
3 : * Copyright (c) 2006-2015, Jouni Malinen <j@w1.fi>
4 : *
5 : * This software may be distributed under the terms of the BSD license.
6 : * See README for more details.
7 : */
8 :
9 : #include "includes.h"
10 :
11 : #ifdef CONFIG_PEERKEY
12 :
13 : #include "common.h"
14 : #include "eloop.h"
15 : #include "crypto/sha1.h"
16 : #include "crypto/sha256.h"
17 : #include "crypto/random.h"
18 : #include "common/ieee802_11_defs.h"
19 : #include "wpa.h"
20 : #include "wpa_i.h"
21 : #include "wpa_ie.h"
22 : #include "peerkey.h"
23 :
24 :
25 7 : static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len)
26 : {
27 7 : os_memcpy(pos, ie, ie_len);
28 7 : return pos + ie_len;
29 : }
30 :
31 :
32 14 : static u8 * wpa_add_kde(u8 *pos, u32 kde, const u8 *data, size_t data_len)
33 : {
34 14 : *pos++ = WLAN_EID_VENDOR_SPECIFIC;
35 14 : *pos++ = RSN_SELECTOR_LEN + data_len;
36 14 : RSN_SELECTOR_PUT(pos, kde);
37 14 : pos += RSN_SELECTOR_LEN;
38 14 : os_memcpy(pos, data, data_len);
39 14 : pos += data_len;
40 14 : return pos;
41 : }
42 :
43 :
44 0 : static void wpa_supplicant_smk_timeout(void *eloop_ctx, void *timeout_ctx)
45 : {
46 : #if 0
47 : struct wpa_sm *sm = eloop_ctx;
48 : struct wpa_peerkey *peerkey = timeout_ctx;
49 : #endif
50 : /* TODO: time out SMK and any STK that was generated using this SMK */
51 0 : }
52 :
53 :
54 5 : static void wpa_supplicant_peerkey_free(struct wpa_sm *sm,
55 : struct wpa_peerkey *peerkey)
56 : {
57 5 : eloop_cancel_timeout(wpa_supplicant_smk_timeout, sm, peerkey);
58 5 : os_free(peerkey);
59 5 : }
60 :
61 :
62 2 : static int wpa_supplicant_send_smk_error(struct wpa_sm *sm, const u8 *dst,
63 : const u8 *peer,
64 : u16 mui, u16 error_type, int ver)
65 : {
66 : size_t rlen;
67 : struct wpa_eapol_key *err;
68 : struct wpa_eapol_key_192 *err192;
69 : struct rsn_error_kde error;
70 : u8 *rbuf, *pos;
71 : size_t kde_len;
72 : u16 key_info;
73 :
74 2 : kde_len = 2 + RSN_SELECTOR_LEN + sizeof(error);
75 2 : if (peer)
76 2 : kde_len += 2 + RSN_SELECTOR_LEN + ETH_ALEN;
77 :
78 2 : rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
79 : NULL, sizeof(*err) + kde_len, &rlen,
80 : (void *) &err);
81 2 : if (rbuf == NULL)
82 0 : return -1;
83 2 : err192 = (struct wpa_eapol_key_192 *) err;
84 :
85 2 : err->type = EAPOL_KEY_TYPE_RSN;
86 2 : key_info = ver | WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
87 : WPA_KEY_INFO_SECURE | WPA_KEY_INFO_ERROR |
88 : WPA_KEY_INFO_REQUEST;
89 2 : WPA_PUT_BE16(err->key_info, key_info);
90 2 : WPA_PUT_BE16(err->key_length, 0);
91 2 : os_memcpy(err->replay_counter, sm->request_counter,
92 : WPA_REPLAY_COUNTER_LEN);
93 2 : inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
94 :
95 2 : WPA_PUT_BE16(err->key_data_length, (u16) kde_len);
96 2 : pos = (u8 *) (err + 1);
97 :
98 2 : if (peer) {
99 : /* Peer MAC Address KDE */
100 2 : pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peer, ETH_ALEN);
101 : }
102 :
103 : /* Error KDE */
104 2 : error.mui = host_to_be16(mui);
105 2 : error.error_type = host_to_be16(error_type);
106 2 : wpa_add_kde(pos, RSN_KEY_DATA_ERROR, (u8 *) &error, sizeof(error));
107 :
108 2 : if (peer) {
109 14 : wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK Error (peer "
110 : MACSTR " mui %d error_type %d)",
111 12 : MAC2STR(peer), mui, error_type);
112 : } else {
113 0 : wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK Error "
114 : "(mui %d error_type %d)", mui, error_type);
115 : }
116 :
117 2 : wpa_eapol_key_send(sm, sm->ptk.kck, sm->ptk.kck_len, ver, dst,
118 2 : ETH_P_EAPOL, rbuf, rlen, err192->key_mic);
119 :
120 2 : return 0;
121 : }
122 :
123 :
124 1 : static int wpa_supplicant_send_smk_m3(struct wpa_sm *sm,
125 : const unsigned char *src_addr,
126 : const struct wpa_eapol_key *key,
127 : int ver, struct wpa_peerkey *peerkey)
128 : {
129 : size_t rlen;
130 : struct wpa_eapol_key *reply;
131 : struct wpa_eapol_key_192 *reply192;
132 : u8 *rbuf, *pos;
133 : size_t kde_len;
134 : u16 key_info;
135 :
136 : /* KDEs: Peer RSN IE, Initiator MAC Address, Initiator Nonce */
137 1 : kde_len = peerkey->rsnie_p_len +
138 : 2 + RSN_SELECTOR_LEN + ETH_ALEN +
139 : 2 + RSN_SELECTOR_LEN + WPA_NONCE_LEN;
140 :
141 1 : rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
142 : NULL, sizeof(*reply) + kde_len, &rlen,
143 : (void *) &reply);
144 1 : if (rbuf == NULL)
145 0 : return -1;
146 1 : reply192 = (struct wpa_eapol_key_192 *) reply;
147 :
148 1 : reply->type = EAPOL_KEY_TYPE_RSN;
149 1 : key_info = ver | WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
150 : WPA_KEY_INFO_SECURE;
151 1 : WPA_PUT_BE16(reply->key_info, key_info);
152 1 : WPA_PUT_BE16(reply->key_length, 0);
153 1 : os_memcpy(reply->replay_counter, key->replay_counter,
154 : WPA_REPLAY_COUNTER_LEN);
155 :
156 1 : os_memcpy(reply->key_nonce, peerkey->pnonce, WPA_NONCE_LEN);
157 :
158 1 : WPA_PUT_BE16(reply->key_data_length, (u16) kde_len);
159 1 : pos = (u8 *) (reply + 1);
160 :
161 : /* Peer RSN IE */
162 1 : pos = wpa_add_ie(pos, peerkey->rsnie_p, peerkey->rsnie_p_len);
163 :
164 : /* Initiator MAC Address KDE */
165 1 : pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peerkey->addr, ETH_ALEN);
166 :
167 : /* Initiator Nonce */
168 1 : wpa_add_kde(pos, RSN_KEY_DATA_NONCE, peerkey->inonce, WPA_NONCE_LEN);
169 :
170 1 : wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK M3");
171 1 : wpa_eapol_key_send(sm, sm->ptk.kck, sm->ptk.kck_len, ver, src_addr,
172 1 : ETH_P_EAPOL, rbuf, rlen, reply192->key_mic);
173 :
174 1 : return 0;
175 : }
176 :
177 :
178 3 : static int wpa_supplicant_process_smk_m2(
179 : struct wpa_sm *sm, const unsigned char *src_addr,
180 : const struct wpa_eapol_key *key, size_t extra_len, int ver)
181 : {
182 : struct wpa_peerkey *peerkey;
183 : struct wpa_eapol_ie_parse kde;
184 : struct wpa_ie_data ie;
185 : int cipher;
186 : struct rsn_ie_hdr *hdr;
187 : u8 *pos;
188 :
189 3 : wpa_printf(MSG_DEBUG, "RSN: Received SMK M2");
190 :
191 3 : if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) {
192 0 : wpa_printf(MSG_INFO, "RSN: SMK handshake not allowed for "
193 : "the current network");
194 0 : return -1;
195 : }
196 :
197 3 : if (wpa_supplicant_parse_ies((const u8 *) (key + 1), extra_len, &kde) <
198 : 0) {
199 0 : wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK M2");
200 0 : return -1;
201 : }
202 :
203 6 : if (kde.rsn_ie == NULL || kde.mac_addr == NULL ||
204 3 : kde.mac_addr_len < ETH_ALEN) {
205 0 : wpa_printf(MSG_INFO, "RSN: No RSN IE or MAC address KDE in "
206 : "SMK M2");
207 0 : return -1;
208 : }
209 :
210 18 : wpa_printf(MSG_DEBUG, "RSN: SMK M2 - SMK initiator " MACSTR,
211 18 : MAC2STR(kde.mac_addr));
212 :
213 3 : if (kde.rsn_ie_len > PEERKEY_MAX_IE_LEN) {
214 0 : wpa_printf(MSG_INFO, "RSN: Too long Initiator RSN IE in SMK "
215 : "M2");
216 0 : return -1;
217 : }
218 :
219 3 : if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
220 0 : wpa_printf(MSG_INFO, "RSN: Failed to parse RSN IE in SMK M2");
221 0 : return -1;
222 : }
223 :
224 6 : cipher = wpa_pick_pairwise_cipher(ie.pairwise_cipher &
225 3 : sm->allowed_pairwise_cipher, 0);
226 3 : if (cipher < 0) {
227 2 : wpa_printf(MSG_INFO, "RSN: No acceptable cipher in SMK M2");
228 2 : wpa_supplicant_send_smk_error(sm, src_addr, kde.mac_addr,
229 : STK_MUI_SMK, STK_ERR_CPHR_NS,
230 : ver);
231 2 : return -1;
232 : }
233 1 : wpa_printf(MSG_DEBUG, "RSN: Using %s for PeerKey",
234 : wpa_cipher_txt(cipher));
235 :
236 : /* TODO: find existing entry and if found, use that instead of adding
237 : * a new one; how to handle the case where both ends initiate at the
238 : * same time? */
239 1 : peerkey = os_zalloc(sizeof(*peerkey));
240 1 : if (peerkey == NULL)
241 0 : return -1;
242 1 : os_memcpy(peerkey->addr, kde.mac_addr, ETH_ALEN);
243 1 : os_memcpy(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN);
244 1 : os_memcpy(peerkey->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
245 1 : peerkey->rsnie_i_len = kde.rsn_ie_len;
246 1 : peerkey->cipher = cipher;
247 1 : peerkey->akmp = ie.key_mgmt;
248 :
249 1 : if (random_get_bytes(peerkey->pnonce, WPA_NONCE_LEN)) {
250 0 : wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
251 : "WPA: Failed to get random data for PNonce");
252 0 : wpa_supplicant_peerkey_free(sm, peerkey);
253 0 : return -1;
254 : }
255 :
256 1 : hdr = (struct rsn_ie_hdr *) peerkey->rsnie_p;
257 1 : hdr->elem_id = WLAN_EID_RSN;
258 1 : WPA_PUT_LE16(hdr->version, RSN_VERSION);
259 1 : pos = (u8 *) (hdr + 1);
260 : /* Group Suite can be anything for SMK RSN IE; receiver will just
261 : * ignore it. */
262 1 : RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
263 1 : pos += RSN_SELECTOR_LEN;
264 : /* Include only the selected cipher in pairwise cipher suite */
265 1 : WPA_PUT_LE16(pos, 1);
266 1 : pos += 2;
267 1 : RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, cipher));
268 1 : pos += RSN_SELECTOR_LEN;
269 :
270 1 : hdr->len = (pos - peerkey->rsnie_p) - 2;
271 1 : peerkey->rsnie_p_len = pos - peerkey->rsnie_p;
272 2 : wpa_hexdump(MSG_DEBUG, "WPA: RSN IE for SMK handshake",
273 1 : peerkey->rsnie_p, peerkey->rsnie_p_len);
274 :
275 1 : wpa_supplicant_send_smk_m3(sm, src_addr, key, ver, peerkey);
276 :
277 1 : peerkey->next = sm->peerkey;
278 1 : sm->peerkey = peerkey;
279 :
280 1 : return 0;
281 : }
282 :
283 :
284 : /**
285 : * rsn_smkid - Derive SMK identifier
286 : * @smk: Station master key (32 bytes)
287 : * @pnonce: Peer Nonce
288 : * @mac_p: Peer MAC address
289 : * @inonce: Initiator Nonce
290 : * @mac_i: Initiator MAC address
291 : * @akmp: Negotiated AKM
292 : *
293 : * 8.5.1.4 Station to station (STK) key hierarchy
294 : * SMKID = HMAC-SHA1-128(SMK, "SMK Name" || PNonce || MAC_P || INonce || MAC_I)
295 : */
296 2 : static void rsn_smkid(const u8 *smk, const u8 *pnonce, const u8 *mac_p,
297 : const u8 *inonce, const u8 *mac_i, u8 *smkid,
298 : int akmp)
299 : {
300 2 : char *title = "SMK Name";
301 : const u8 *addr[5];
302 2 : const size_t len[5] = { 8, WPA_NONCE_LEN, ETH_ALEN, WPA_NONCE_LEN,
303 : ETH_ALEN };
304 : unsigned char hash[SHA256_MAC_LEN];
305 :
306 2 : addr[0] = (u8 *) title;
307 2 : addr[1] = pnonce;
308 2 : addr[2] = mac_p;
309 2 : addr[3] = inonce;
310 2 : addr[4] = mac_i;
311 :
312 : #ifdef CONFIG_IEEE80211W
313 2 : if (wpa_key_mgmt_sha256(akmp))
314 0 : hmac_sha256_vector(smk, PMK_LEN, 5, addr, len, hash);
315 : else
316 : #endif /* CONFIG_IEEE80211W */
317 2 : hmac_sha1_vector(smk, PMK_LEN, 5, addr, len, hash);
318 2 : os_memcpy(smkid, hash, PMKID_LEN);
319 2 : }
320 :
321 :
322 1 : static void wpa_supplicant_send_stk_1_of_4(struct wpa_sm *sm,
323 : struct wpa_peerkey *peerkey)
324 : {
325 : size_t mlen;
326 : struct wpa_eapol_key *msg;
327 : u8 *mbuf;
328 : size_t kde_len;
329 : u16 key_info, ver;
330 :
331 1 : kde_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
332 :
333 1 : mbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
334 : sizeof(*msg) + kde_len, &mlen,
335 : (void *) &msg);
336 1 : if (mbuf == NULL)
337 0 : return;
338 :
339 1 : msg->type = EAPOL_KEY_TYPE_RSN;
340 :
341 1 : if (peerkey->cipher != WPA_CIPHER_TKIP)
342 1 : ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
343 : else
344 0 : ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
345 :
346 1 : key_info = ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_ACK;
347 1 : WPA_PUT_BE16(msg->key_info, key_info);
348 :
349 1 : if (peerkey->cipher != WPA_CIPHER_TKIP)
350 1 : WPA_PUT_BE16(msg->key_length, 16);
351 : else
352 0 : WPA_PUT_BE16(msg->key_length, 32);
353 :
354 1 : os_memcpy(msg->replay_counter, peerkey->replay_counter,
355 : WPA_REPLAY_COUNTER_LEN);
356 1 : inc_byte_array(peerkey->replay_counter, WPA_REPLAY_COUNTER_LEN);
357 :
358 1 : WPA_PUT_BE16(msg->key_data_length, kde_len);
359 1 : wpa_add_kde((u8 *) (msg + 1), RSN_KEY_DATA_PMKID,
360 1 : peerkey->smkid, PMKID_LEN);
361 :
362 1 : if (random_get_bytes(peerkey->inonce, WPA_NONCE_LEN)) {
363 0 : wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
364 : "RSN: Failed to get random data for INonce (STK)");
365 0 : os_free(mbuf);
366 0 : return;
367 : }
368 1 : wpa_hexdump(MSG_DEBUG, "RSN: INonce for STK 4-Way Handshake",
369 1 : peerkey->inonce, WPA_NONCE_LEN);
370 1 : os_memcpy(msg->key_nonce, peerkey->inonce, WPA_NONCE_LEN);
371 :
372 6 : wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key STK 1/4 to " MACSTR,
373 6 : MAC2STR(peerkey->addr));
374 1 : wpa_eapol_key_send(sm, NULL, 0, ver, peerkey->addr, ETH_P_EAPOL,
375 : mbuf, mlen, NULL);
376 : }
377 :
378 :
379 1 : static void wpa_supplicant_send_stk_3_of_4(struct wpa_sm *sm,
380 : struct wpa_peerkey *peerkey)
381 : {
382 : size_t mlen;
383 : struct wpa_eapol_key *msg;
384 : u8 *mbuf, *pos;
385 : size_t kde_len;
386 : u16 key_info, ver;
387 : be32 lifetime;
388 :
389 1 : kde_len = peerkey->rsnie_i_len +
390 : 2 + RSN_SELECTOR_LEN + sizeof(lifetime);
391 :
392 1 : mbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
393 : sizeof(*msg) + kde_len, &mlen,
394 : (void *) &msg);
395 1 : if (mbuf == NULL)
396 1 : return;
397 :
398 1 : msg->type = EAPOL_KEY_TYPE_RSN;
399 :
400 1 : if (peerkey->cipher != WPA_CIPHER_TKIP)
401 1 : ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
402 : else
403 0 : ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
404 :
405 1 : key_info = ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_ACK |
406 : WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE;
407 1 : WPA_PUT_BE16(msg->key_info, key_info);
408 :
409 1 : if (peerkey->cipher != WPA_CIPHER_TKIP)
410 1 : WPA_PUT_BE16(msg->key_length, 16);
411 : else
412 0 : WPA_PUT_BE16(msg->key_length, 32);
413 :
414 1 : os_memcpy(msg->replay_counter, peerkey->replay_counter,
415 : WPA_REPLAY_COUNTER_LEN);
416 1 : inc_byte_array(peerkey->replay_counter, WPA_REPLAY_COUNTER_LEN);
417 :
418 1 : WPA_PUT_BE16(msg->key_data_length, kde_len);
419 1 : pos = (u8 *) (msg + 1);
420 1 : pos = wpa_add_ie(pos, peerkey->rsnie_i, peerkey->rsnie_i_len);
421 1 : lifetime = host_to_be32(peerkey->lifetime);
422 1 : wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME,
423 : (u8 *) &lifetime, sizeof(lifetime));
424 :
425 1 : os_memcpy(msg->key_nonce, peerkey->inonce, WPA_NONCE_LEN);
426 :
427 6 : wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key STK 3/4 to " MACSTR,
428 6 : MAC2STR(peerkey->addr));
429 2 : wpa_eapol_key_send(sm, peerkey->stk.kck, peerkey->stk.kck_len, ver,
430 1 : peerkey->addr, ETH_P_EAPOL, mbuf, mlen,
431 1 : msg->key_mic);
432 : }
433 :
434 :
435 1 : static int wpa_supplicant_process_smk_m4(struct wpa_peerkey *peerkey,
436 : struct wpa_eapol_ie_parse *kde)
437 : {
438 6 : wpa_printf(MSG_DEBUG, "RSN: Received SMK M4 (Initiator " MACSTR ")",
439 6 : MAC2STR(kde->mac_addr));
440 :
441 1 : if (os_memcmp(kde->smk + PMK_LEN, peerkey->pnonce, WPA_NONCE_LEN) != 0)
442 : {
443 0 : wpa_printf(MSG_INFO, "RSN: PNonce in SMK KDE does not "
444 : "match with the one used in SMK M3");
445 0 : return -1;
446 : }
447 :
448 1 : if (os_memcmp(kde->nonce, peerkey->inonce, WPA_NONCE_LEN) != 0) {
449 0 : wpa_printf(MSG_INFO, "RSN: INonce in SMK M4 did not "
450 : "match with the one received in SMK M2");
451 0 : return -1;
452 : }
453 :
454 1 : return 0;
455 : }
456 :
457 :
458 1 : static int wpa_supplicant_process_smk_m5(struct wpa_sm *sm,
459 : const unsigned char *src_addr,
460 : const struct wpa_eapol_key *key,
461 : int ver,
462 : struct wpa_peerkey *peerkey,
463 : struct wpa_eapol_ie_parse *kde)
464 : {
465 : int cipher;
466 : struct wpa_ie_data ie;
467 :
468 6 : wpa_printf(MSG_DEBUG, "RSN: Received SMK M5 (Peer " MACSTR ")",
469 6 : MAC2STR(kde->mac_addr));
470 2 : if (kde->rsn_ie == NULL || kde->rsn_ie_len > PEERKEY_MAX_IE_LEN ||
471 1 : wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0) {
472 0 : wpa_printf(MSG_INFO, "RSN: No RSN IE in SMK M5");
473 : /* TODO: abort negotiation */
474 0 : return -1;
475 : }
476 :
477 1 : if (os_memcmp(key->key_nonce, peerkey->inonce, WPA_NONCE_LEN) != 0) {
478 0 : wpa_printf(MSG_INFO, "RSN: Key Nonce in SMK M5 does "
479 : "not match with INonce used in SMK M1");
480 0 : return -1;
481 : }
482 :
483 1 : if (os_memcmp(kde->smk + PMK_LEN, peerkey->inonce, WPA_NONCE_LEN) != 0)
484 : {
485 0 : wpa_printf(MSG_INFO, "RSN: INonce in SMK KDE does not "
486 : "match with the one used in SMK M1");
487 0 : return -1;
488 : }
489 :
490 1 : os_memcpy(peerkey->rsnie_p, kde->rsn_ie, kde->rsn_ie_len);
491 1 : peerkey->rsnie_p_len = kde->rsn_ie_len;
492 1 : os_memcpy(peerkey->pnonce, kde->nonce, WPA_NONCE_LEN);
493 :
494 2 : cipher = wpa_pick_pairwise_cipher(ie.pairwise_cipher &
495 1 : sm->allowed_pairwise_cipher, 0);
496 1 : if (cipher < 0) {
497 0 : wpa_printf(MSG_INFO, "RSN: SMK Peer STA " MACSTR " selected "
498 0 : "unacceptable cipher", MAC2STR(kde->mac_addr));
499 0 : wpa_supplicant_send_smk_error(sm, src_addr, kde->mac_addr,
500 : STK_MUI_SMK, STK_ERR_CPHR_NS,
501 : ver);
502 : /* TODO: abort negotiation */
503 0 : return -1;
504 : }
505 1 : wpa_printf(MSG_DEBUG, "RSN: Using %s for PeerKey",
506 : wpa_cipher_txt(cipher));
507 1 : peerkey->cipher = cipher;
508 :
509 1 : return 0;
510 : }
511 :
512 :
513 2 : static int wpa_supplicant_process_smk_m45(
514 : struct wpa_sm *sm, const unsigned char *src_addr,
515 : const struct wpa_eapol_key *key, size_t extra_len, int ver)
516 : {
517 : struct wpa_peerkey *peerkey;
518 : struct wpa_eapol_ie_parse kde;
519 : u32 lifetime;
520 :
521 2 : if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) {
522 0 : wpa_printf(MSG_DEBUG, "RSN: SMK handshake not allowed for "
523 : "the current network");
524 0 : return -1;
525 : }
526 :
527 2 : if (wpa_supplicant_parse_ies((const u8 *) (key + 1), extra_len, &kde) <
528 : 0) {
529 0 : wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK M4/M5");
530 0 : return -1;
531 : }
532 :
533 4 : if (kde.mac_addr == NULL || kde.mac_addr_len < ETH_ALEN ||
534 6 : kde.nonce == NULL || kde.nonce_len < WPA_NONCE_LEN ||
535 6 : kde.smk == NULL || kde.smk_len < PMK_LEN + WPA_NONCE_LEN ||
536 4 : kde.lifetime == NULL || kde.lifetime_len < 4) {
537 0 : wpa_printf(MSG_INFO, "RSN: No MAC Address, Nonce, SMK, or "
538 : "Lifetime KDE in SMK M4/M5");
539 0 : return -1;
540 : }
541 :
542 2 : for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
543 4 : if (os_memcmp(peerkey->addr, kde.mac_addr, ETH_ALEN) == 0 &&
544 2 : os_memcmp(peerkey->initiator ? peerkey->inonce :
545 : peerkey->pnonce,
546 : key->key_nonce, WPA_NONCE_LEN) == 0)
547 2 : break;
548 : }
549 2 : if (peerkey == NULL) {
550 0 : wpa_printf(MSG_INFO, "RSN: No matching SMK handshake found "
551 : "for SMK M4/M5: peer " MACSTR,
552 0 : MAC2STR(kde.mac_addr));
553 0 : return -1;
554 : }
555 :
556 2 : if (peerkey->initiator) {
557 1 : if (wpa_supplicant_process_smk_m5(sm, src_addr, key, ver,
558 : peerkey, &kde) < 0)
559 0 : return -1;
560 : } else {
561 1 : if (wpa_supplicant_process_smk_m4(peerkey, &kde) < 0)
562 0 : return -1;
563 : }
564 :
565 2 : os_memcpy(peerkey->smk, kde.smk, PMK_LEN);
566 2 : peerkey->smk_complete = 1;
567 2 : wpa_hexdump_key(MSG_DEBUG, "RSN: SMK", peerkey->smk, PMK_LEN);
568 2 : lifetime = WPA_GET_BE32(kde.lifetime);
569 2 : wpa_printf(MSG_DEBUG, "RSN: SMK lifetime %u seconds", lifetime);
570 2 : if (lifetime > 1000000000)
571 0 : lifetime = 1000000000; /* avoid overflowing eloop time */
572 2 : peerkey->lifetime = lifetime;
573 2 : eloop_register_timeout(lifetime, 0, wpa_supplicant_smk_timeout,
574 : sm, peerkey);
575 :
576 2 : if (peerkey->initiator) {
577 2 : rsn_smkid(peerkey->smk, peerkey->pnonce, peerkey->addr,
578 1 : peerkey->inonce, sm->own_addr, peerkey->smkid,
579 : peerkey->akmp);
580 1 : wpa_supplicant_send_stk_1_of_4(sm, peerkey);
581 : } else {
582 2 : rsn_smkid(peerkey->smk, peerkey->pnonce, sm->own_addr,
583 1 : peerkey->inonce, peerkey->addr, peerkey->smkid,
584 : peerkey->akmp);
585 : }
586 2 : wpa_hexdump(MSG_DEBUG, "RSN: SMKID", peerkey->smkid, PMKID_LEN);
587 :
588 2 : return 0;
589 : }
590 :
591 :
592 3 : static int wpa_supplicant_process_smk_error(
593 : struct wpa_sm *sm, const unsigned char *src_addr,
594 : const struct wpa_eapol_key *key, size_t extra_len)
595 : {
596 : struct wpa_eapol_ie_parse kde;
597 : struct rsn_error_kde error;
598 : u8 peer[ETH_ALEN];
599 : u16 error_type;
600 :
601 3 : wpa_printf(MSG_DEBUG, "RSN: Received SMK Error");
602 :
603 3 : if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) {
604 0 : wpa_printf(MSG_DEBUG, "RSN: SMK handshake not allowed for "
605 : "the current network");
606 0 : return -1;
607 : }
608 :
609 3 : if (wpa_supplicant_parse_ies((const u8 *) (key + 1), extra_len, &kde) <
610 : 0) {
611 0 : wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK Error");
612 0 : return -1;
613 : }
614 :
615 3 : if (kde.error == NULL || kde.error_len < sizeof(error)) {
616 0 : wpa_printf(MSG_INFO, "RSN: No Error KDE in SMK Error");
617 0 : return -1;
618 : }
619 :
620 3 : if (kde.mac_addr && kde.mac_addr_len >= ETH_ALEN)
621 3 : os_memcpy(peer, kde.mac_addr, ETH_ALEN);
622 : else
623 0 : os_memset(peer, 0, ETH_ALEN);
624 3 : os_memcpy(&error, kde.error, sizeof(error));
625 3 : error_type = be_to_host16(error.error_type);
626 21 : wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
627 : "RSN: SMK Error KDE received: MUI %d error_type %d peer "
628 : MACSTR,
629 3 : be_to_host16(error.mui), error_type,
630 18 : MAC2STR(peer));
631 :
632 3 : if (kde.mac_addr &&
633 2 : (error_type == STK_ERR_STA_NR || error_type == STK_ERR_STA_NRSN ||
634 : error_type == STK_ERR_CPHR_NS)) {
635 : struct wpa_peerkey *peerkey;
636 :
637 3 : for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
638 3 : if (os_memcmp(peerkey->addr, kde.mac_addr, ETH_ALEN) ==
639 : 0)
640 3 : break;
641 : }
642 3 : if (peerkey == NULL) {
643 0 : wpa_printf(MSG_DEBUG, "RSN: No matching SMK handshake "
644 : "found for SMK Error");
645 0 : return -1;
646 : }
647 : /* TODO: abort SMK/STK handshake and remove all related keys */
648 : }
649 :
650 3 : return 0;
651 : }
652 :
653 :
654 1 : static void wpa_supplicant_process_stk_1_of_4(struct wpa_sm *sm,
655 : struct wpa_peerkey *peerkey,
656 : const struct wpa_eapol_key *key,
657 : u16 ver, const u8 *key_data,
658 : size_t key_data_len)
659 : {
660 : struct wpa_eapol_ie_parse ie;
661 : size_t kde_buf_len;
662 : struct wpa_ptk *stk;
663 : u8 buf[8], *kde_buf, *pos;
664 : be32 lifetime;
665 :
666 7 : wpa_printf(MSG_DEBUG, "RSN: RX message 1 of STK 4-Way Handshake from "
667 6 : MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
668 :
669 1 : os_memset(&ie, 0, sizeof(ie));
670 :
671 : /* RSN: msg 1/4 should contain SMKID for the selected SMK */
672 1 : wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", key_data, key_data_len);
673 2 : if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0 ||
674 1 : ie.pmkid == NULL) {
675 0 : wpa_printf(MSG_DEBUG, "RSN: No SMKID in STK 1/4");
676 0 : return;
677 : }
678 1 : if (os_memcmp_const(ie.pmkid, peerkey->smkid, PMKID_LEN) != 0) {
679 0 : wpa_hexdump(MSG_DEBUG, "RSN: Unknown SMKID in STK 1/4",
680 0 : ie.pmkid, PMKID_LEN);
681 0 : return;
682 : }
683 :
684 1 : if (random_get_bytes(peerkey->pnonce, WPA_NONCE_LEN)) {
685 0 : wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
686 : "RSN: Failed to get random data for PNonce");
687 0 : return;
688 : }
689 1 : wpa_hexdump(MSG_DEBUG, "WPA: Renewed PNonce",
690 1 : peerkey->pnonce, WPA_NONCE_LEN);
691 :
692 : /* Calculate STK which will be stored as a temporary STK until it has
693 : * been verified when processing message 3/4. */
694 1 : stk = &peerkey->tstk;
695 2 : wpa_pmk_to_ptk(peerkey->smk, PMK_LEN, "Peer key expansion",
696 1 : sm->own_addr, peerkey->addr,
697 1 : peerkey->pnonce, key->key_nonce,
698 : stk, peerkey->akmp, peerkey->cipher);
699 : /* Supplicant: swap tx/rx Mic keys */
700 1 : os_memcpy(buf, &stk->tk[16], 8);
701 1 : os_memcpy(&stk->tk[16], &stk->tk[24], 8);
702 1 : os_memcpy(&stk->tk[24], buf, 8);
703 1 : peerkey->tstk_set = 1;
704 :
705 1 : kde_buf_len = peerkey->rsnie_p_len +
706 : 2 + RSN_SELECTOR_LEN + sizeof(lifetime) +
707 : 2 + RSN_SELECTOR_LEN + PMKID_LEN;
708 1 : kde_buf = os_malloc(kde_buf_len);
709 1 : if (kde_buf == NULL)
710 0 : return;
711 1 : pos = kde_buf;
712 1 : pos = wpa_add_ie(pos, peerkey->rsnie_p, peerkey->rsnie_p_len);
713 1 : lifetime = host_to_be32(peerkey->lifetime);
714 1 : pos = wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME,
715 : (u8 *) &lifetime, sizeof(lifetime));
716 1 : wpa_add_kde(pos, RSN_KEY_DATA_PMKID, peerkey->smkid, PMKID_LEN);
717 :
718 1 : if (wpa_supplicant_send_2_of_4(sm, peerkey->addr, key, ver,
719 1 : peerkey->pnonce, kde_buf, kde_buf_len,
720 : stk)) {
721 0 : os_free(kde_buf);
722 0 : return;
723 : }
724 1 : os_free(kde_buf);
725 :
726 1 : os_memcpy(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN);
727 : }
728 :
729 :
730 2 : static void wpa_supplicant_update_smk_lifetime(struct wpa_sm *sm,
731 : struct wpa_peerkey *peerkey,
732 : struct wpa_eapol_ie_parse *kde)
733 : {
734 : u32 lifetime;
735 :
736 2 : if (kde->lifetime == NULL || kde->lifetime_len < sizeof(lifetime))
737 0 : return;
738 :
739 2 : lifetime = WPA_GET_BE32(kde->lifetime);
740 :
741 2 : if (lifetime >= peerkey->lifetime) {
742 2 : wpa_printf(MSG_DEBUG, "RSN: Peer used SMK lifetime %u seconds "
743 : "which is larger than or equal to own value %u "
744 : "seconds - ignored", lifetime, peerkey->lifetime);
745 2 : return;
746 : }
747 :
748 0 : wpa_printf(MSG_DEBUG, "RSN: Peer used shorter SMK lifetime %u seconds "
749 : "(own was %u seconds) - updated",
750 : lifetime, peerkey->lifetime);
751 0 : peerkey->lifetime = lifetime;
752 :
753 0 : eloop_cancel_timeout(wpa_supplicant_smk_timeout, sm, peerkey);
754 0 : eloop_register_timeout(lifetime, 0, wpa_supplicant_smk_timeout,
755 : sm, peerkey);
756 : }
757 :
758 :
759 1 : static void wpa_supplicant_process_stk_2_of_4(struct wpa_sm *sm,
760 : struct wpa_peerkey *peerkey,
761 : const struct wpa_eapol_key *key,
762 : u16 ver, const u8 *key_data,
763 : size_t key_data_len)
764 : {
765 : struct wpa_eapol_ie_parse kde;
766 :
767 7 : wpa_printf(MSG_DEBUG, "RSN: RX message 2 of STK 4-Way Handshake from "
768 6 : MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
769 :
770 1 : os_memset(&kde, 0, sizeof(kde));
771 :
772 : /* RSN: msg 2/4 should contain SMKID for the selected SMK and RSN IE
773 : * from the peer. It may also include Lifetime KDE. */
774 1 : wpa_hexdump(MSG_DEBUG, "RSN: msg 2/4 key data", key_data, key_data_len);
775 2 : if (wpa_supplicant_parse_ies(key_data, key_data_len, &kde) < 0 ||
776 2 : kde.pmkid == NULL || kde.rsn_ie == NULL) {
777 0 : wpa_printf(MSG_DEBUG, "RSN: No SMKID or RSN IE in STK 2/4");
778 0 : return;
779 : }
780 :
781 1 : if (os_memcmp_const(kde.pmkid, peerkey->smkid, PMKID_LEN) != 0) {
782 0 : wpa_hexdump(MSG_DEBUG, "RSN: Unknown SMKID in STK 2/4",
783 0 : kde.pmkid, PMKID_LEN);
784 0 : return;
785 : }
786 :
787 2 : if (kde.rsn_ie_len != peerkey->rsnie_p_len ||
788 1 : os_memcmp(kde.rsn_ie, peerkey->rsnie_p, kde.rsn_ie_len) != 0) {
789 0 : wpa_printf(MSG_INFO, "RSN: Peer RSN IE in SMK and STK "
790 : "handshakes did not match");
791 0 : wpa_hexdump(MSG_DEBUG, "RSN: Peer RSN IE in SMK handshake",
792 0 : peerkey->rsnie_p, peerkey->rsnie_p_len);
793 0 : wpa_hexdump(MSG_DEBUG, "RSN: Peer RSN IE in STK handshake",
794 0 : kde.rsn_ie, kde.rsn_ie_len);
795 0 : return;
796 : }
797 :
798 1 : wpa_supplicant_update_smk_lifetime(sm, peerkey, &kde);
799 :
800 1 : wpa_supplicant_send_stk_3_of_4(sm, peerkey);
801 1 : os_memcpy(peerkey->pnonce, key->key_nonce, WPA_NONCE_LEN);
802 : }
803 :
804 :
805 1 : static void wpa_supplicant_process_stk_3_of_4(struct wpa_sm *sm,
806 : struct wpa_peerkey *peerkey,
807 : const struct wpa_eapol_key *key,
808 : u16 ver, const u8 *key_data,
809 : size_t key_data_len)
810 : {
811 : struct wpa_eapol_ie_parse kde;
812 : size_t key_len;
813 : const u8 *_key;
814 : u8 key_buf[32], rsc[6];
815 :
816 7 : wpa_printf(MSG_DEBUG, "RSN: RX message 3 of STK 4-Way Handshake from "
817 6 : MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
818 :
819 1 : os_memset(&kde, 0, sizeof(kde));
820 :
821 : /* RSN: msg 3/4 should contain Initiator RSN IE. It may also include
822 : * Lifetime KDE. */
823 1 : wpa_hexdump(MSG_DEBUG, "RSN: msg 3/4 key data", key_data, key_data_len);
824 1 : if (wpa_supplicant_parse_ies(key_data, key_data_len, &kde) < 0) {
825 0 : wpa_printf(MSG_DEBUG, "RSN: Failed to parse key data in "
826 : "STK 3/4");
827 0 : return;
828 : }
829 :
830 2 : if (kde.rsn_ie_len != peerkey->rsnie_i_len ||
831 1 : os_memcmp(kde.rsn_ie, peerkey->rsnie_i, kde.rsn_ie_len) != 0) {
832 0 : wpa_printf(MSG_INFO, "RSN: Initiator RSN IE in SMK and STK "
833 : "handshakes did not match");
834 0 : wpa_hexdump(MSG_DEBUG, "RSN: Initiator RSN IE in SMK "
835 : "handshake",
836 0 : peerkey->rsnie_i, peerkey->rsnie_i_len);
837 0 : wpa_hexdump(MSG_DEBUG, "RSN: Initiator RSN IE in STK "
838 : "handshake",
839 0 : kde.rsn_ie, kde.rsn_ie_len);
840 0 : return;
841 : }
842 :
843 1 : if (os_memcmp(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN) != 0) {
844 0 : wpa_printf(MSG_WARNING, "RSN: INonce from message 1 of STK "
845 : "4-Way Handshake differs from 3 of STK 4-Way "
846 : "Handshake - drop packet (src=" MACSTR ")",
847 0 : MAC2STR(peerkey->addr));
848 0 : return;
849 : }
850 :
851 1 : wpa_supplicant_update_smk_lifetime(sm, peerkey, &kde);
852 :
853 2 : if (wpa_supplicant_send_4_of_4(sm, peerkey->addr, key, ver,
854 1 : WPA_GET_BE16(key->key_info),
855 : &peerkey->stk))
856 0 : return;
857 :
858 1 : _key = peerkey->stk.tk;
859 1 : if (peerkey->cipher == WPA_CIPHER_TKIP) {
860 : /* Swap Tx/Rx keys for Michael MIC */
861 0 : os_memcpy(key_buf, _key, 16);
862 0 : os_memcpy(key_buf + 16, _key + 24, 8);
863 0 : os_memcpy(key_buf + 24, _key + 16, 8);
864 0 : _key = key_buf;
865 0 : key_len = 32;
866 : } else
867 1 : key_len = 16;
868 :
869 1 : os_memset(rsc, 0, 6);
870 1 : if (wpa_sm_set_key(sm, peerkey->cipher, peerkey->addr, 0, 1,
871 : rsc, sizeof(rsc), _key, key_len) < 0) {
872 1 : os_memset(key_buf, 0, sizeof(key_buf));
873 1 : wpa_printf(MSG_WARNING, "RSN: Failed to set STK to the "
874 : "driver.");
875 1 : return;
876 : }
877 0 : os_memset(key_buf, 0, sizeof(key_buf));
878 : }
879 :
880 :
881 1 : static void wpa_supplicant_process_stk_4_of_4(struct wpa_sm *sm,
882 : struct wpa_peerkey *peerkey,
883 : const struct wpa_eapol_key *key,
884 : u16 ver)
885 : {
886 : u8 rsc[6];
887 :
888 7 : wpa_printf(MSG_DEBUG, "RSN: RX message 4 of STK 4-Way Handshake from "
889 6 : MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
890 :
891 1 : os_memset(rsc, 0, 6);
892 2 : if (wpa_sm_set_key(sm, peerkey->cipher, peerkey->addr, 0, 1,
893 1 : rsc, sizeof(rsc), peerkey->stk.tk,
894 1 : peerkey->cipher == WPA_CIPHER_TKIP ? 32 : 16) < 0) {
895 1 : wpa_printf(MSG_WARNING, "RSN: Failed to set STK to the "
896 : "driver.");
897 1 : return;
898 : }
899 : }
900 :
901 :
902 : /**
903 : * peerkey_verify_eapol_key_mic - Verify PeerKey MIC
904 : * @sm: Pointer to WPA state machine data from wpa_sm_init()
905 : * @peerkey: Pointer to the PeerKey data for the peer
906 : * @key: Pointer to the EAPOL-Key frame header
907 : * @ver: Version bits from EAPOL-Key Key Info
908 : * @buf: Pointer to the beginning of EAPOL-Key frame
909 : * @len: Length of the EAPOL-Key frame
910 : * Returns: 0 on success, -1 on failure
911 : */
912 3 : int peerkey_verify_eapol_key_mic(struct wpa_sm *sm,
913 : struct wpa_peerkey *peerkey,
914 : struct wpa_eapol_key_192 *key, u16 ver,
915 : const u8 *buf, size_t len)
916 : {
917 : u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
918 3 : size_t mic_len = 16;
919 3 : int ok = 0;
920 :
921 3 : if (peerkey->initiator && !peerkey->stk_set) {
922 2 : wpa_pmk_to_ptk(peerkey->smk, PMK_LEN, "Peer key expansion",
923 1 : sm->own_addr, peerkey->addr,
924 1 : peerkey->inonce, key->key_nonce,
925 : &peerkey->stk, peerkey->akmp, peerkey->cipher);
926 1 : peerkey->stk_set = 1;
927 : }
928 :
929 3 : os_memcpy(mic, key->key_mic, mic_len);
930 3 : if (peerkey->tstk_set) {
931 1 : os_memset(key->key_mic, 0, mic_len);
932 2 : wpa_eapol_key_mic(peerkey->tstk.kck, peerkey->tstk.kck_len,
933 2 : sm->key_mgmt, ver, buf, len, key->key_mic);
934 1 : if (os_memcmp_const(mic, key->key_mic, mic_len) != 0) {
935 0 : wpa_printf(MSG_WARNING, "RSN: Invalid EAPOL-Key MIC "
936 : "when using TSTK - ignoring TSTK");
937 : } else {
938 1 : ok = 1;
939 1 : peerkey->tstk_set = 0;
940 1 : peerkey->stk_set = 1;
941 1 : os_memcpy(&peerkey->stk, &peerkey->tstk,
942 : sizeof(peerkey->stk));
943 1 : os_memset(&peerkey->tstk, 0, sizeof(peerkey->tstk));
944 : }
945 : }
946 :
947 3 : if (!ok && peerkey->stk_set) {
948 2 : os_memset(key->key_mic, 0, mic_len);
949 4 : wpa_eapol_key_mic(peerkey->stk.kck, peerkey->stk.kck_len,
950 4 : sm->key_mgmt, ver, buf, len, key->key_mic);
951 2 : if (os_memcmp_const(mic, key->key_mic, mic_len) != 0) {
952 0 : wpa_printf(MSG_WARNING, "RSN: Invalid EAPOL-Key MIC "
953 : "- dropping packet");
954 0 : return -1;
955 : }
956 2 : ok = 1;
957 : }
958 :
959 3 : if (!ok) {
960 0 : wpa_printf(MSG_WARNING, "RSN: Could not verify EAPOL-Key MIC "
961 : "- dropping packet");
962 0 : return -1;
963 : }
964 :
965 3 : os_memcpy(peerkey->replay_counter, key->replay_counter,
966 : WPA_REPLAY_COUNTER_LEN);
967 3 : peerkey->replay_counter_set = 1;
968 3 : return 0;
969 : }
970 :
971 :
972 : /**
973 : * wpa_sm_stkstart - Send EAPOL-Key Request for STK handshake (STK M1)
974 : * @sm: Pointer to WPA state machine data from wpa_sm_init()
975 : * @peer: MAC address of the peer STA
976 : * Returns: 0 on success, or -1 on failure
977 : *
978 : * Send an EAPOL-Key Request to the current authenticator to start STK
979 : * handshake with the peer.
980 : */
981 5 : int wpa_sm_stkstart(struct wpa_sm *sm, const u8 *peer)
982 : {
983 : size_t rlen, kde_len;
984 : struct wpa_eapol_key *req;
985 : int key_info, ver;
986 : u8 bssid[ETH_ALEN], *rbuf, *pos, *count_pos;
987 : u16 count;
988 : struct rsn_ie_hdr *hdr;
989 : struct wpa_peerkey *peerkey;
990 : struct wpa_ie_data ie;
991 :
992 5 : if (sm->proto != WPA_PROTO_RSN || !sm->ptk_set || !sm->peerkey_enabled)
993 1 : return -1;
994 :
995 8 : if (sm->ap_rsn_ie &&
996 8 : wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &ie) == 0 &&
997 4 : !(ie.capabilities & WPA_CAPABILITY_PEERKEY_ENABLED)) {
998 0 : wpa_printf(MSG_DEBUG, "RSN: Current AP does not support STK");
999 0 : return -1;
1000 : }
1001 :
1002 4 : if (sm->pairwise_cipher != WPA_CIPHER_TKIP)
1003 3 : ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1004 : else
1005 1 : ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1006 :
1007 4 : if (wpa_sm_get_bssid(sm, bssid) < 0) {
1008 0 : wpa_printf(MSG_WARNING, "Failed to read BSSID for EAPOL-Key "
1009 : "SMK M1");
1010 0 : return -1;
1011 : }
1012 :
1013 : /* TODO: find existing entry and if found, use that instead of adding
1014 : * a new one */
1015 4 : peerkey = os_zalloc(sizeof(*peerkey));
1016 4 : if (peerkey == NULL)
1017 0 : return -1;
1018 4 : peerkey->initiator = 1;
1019 4 : os_memcpy(peerkey->addr, peer, ETH_ALEN);
1020 4 : peerkey->akmp = sm->key_mgmt;
1021 :
1022 : /* SMK M1:
1023 : * EAPOL-Key(S=1, M=1, A=0, I=0, K=0, SM=1, KeyRSC=0, Nonce=INonce,
1024 : * MIC=MIC, DataKDs=(RSNIE_I, MAC_P KDE))
1025 : */
1026 :
1027 4 : hdr = (struct rsn_ie_hdr *) peerkey->rsnie_i;
1028 4 : hdr->elem_id = WLAN_EID_RSN;
1029 4 : WPA_PUT_LE16(hdr->version, RSN_VERSION);
1030 4 : pos = (u8 *) (hdr + 1);
1031 : /* Group Suite can be anything for SMK RSN IE; receiver will just
1032 : * ignore it. */
1033 4 : RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1034 4 : pos += RSN_SELECTOR_LEN;
1035 4 : count_pos = pos;
1036 4 : pos += 2;
1037 :
1038 4 : count = rsn_cipher_put_suites(pos, sm->allowed_pairwise_cipher);
1039 4 : pos += count * RSN_SELECTOR_LEN;
1040 4 : WPA_PUT_LE16(count_pos, count);
1041 :
1042 4 : hdr->len = (pos - peerkey->rsnie_i) - 2;
1043 4 : peerkey->rsnie_i_len = pos - peerkey->rsnie_i;
1044 8 : wpa_hexdump(MSG_DEBUG, "WPA: RSN IE for SMK handshake",
1045 4 : peerkey->rsnie_i, peerkey->rsnie_i_len);
1046 :
1047 4 : kde_len = peerkey->rsnie_i_len + 2 + RSN_SELECTOR_LEN + ETH_ALEN;
1048 :
1049 4 : rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1050 : sizeof(*req) + kde_len, &rlen,
1051 : (void *) &req);
1052 4 : if (rbuf == NULL) {
1053 0 : wpa_supplicant_peerkey_free(sm, peerkey);
1054 0 : return -1;
1055 : }
1056 :
1057 4 : req->type = EAPOL_KEY_TYPE_RSN;
1058 4 : key_info = WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
1059 4 : WPA_KEY_INFO_SECURE | WPA_KEY_INFO_REQUEST | ver;
1060 4 : WPA_PUT_BE16(req->key_info, key_info);
1061 4 : WPA_PUT_BE16(req->key_length, 0);
1062 4 : os_memcpy(req->replay_counter, sm->request_counter,
1063 : WPA_REPLAY_COUNTER_LEN);
1064 4 : inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
1065 :
1066 4 : if (random_get_bytes(peerkey->inonce, WPA_NONCE_LEN)) {
1067 0 : wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1068 : "WPA: Failed to get random data for INonce");
1069 0 : os_free(rbuf);
1070 0 : wpa_supplicant_peerkey_free(sm, peerkey);
1071 0 : return -1;
1072 : }
1073 4 : os_memcpy(req->key_nonce, peerkey->inonce, WPA_NONCE_LEN);
1074 4 : wpa_hexdump(MSG_DEBUG, "WPA: INonce for SMK handshake",
1075 4 : req->key_nonce, WPA_NONCE_LEN);
1076 :
1077 4 : WPA_PUT_BE16(req->key_data_length, (u16) kde_len);
1078 4 : pos = (u8 *) (req + 1);
1079 :
1080 : /* Initiator RSN IE */
1081 4 : pos = wpa_add_ie(pos, peerkey->rsnie_i, peerkey->rsnie_i_len);
1082 : /* Peer MAC address KDE */
1083 4 : wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peer, ETH_ALEN);
1084 :
1085 24 : wpa_printf(MSG_INFO, "RSN: Sending EAPOL-Key SMK M1 Request (peer "
1086 24 : MACSTR ")", MAC2STR(peer));
1087 4 : wpa_eapol_key_send(sm, sm->ptk.kck, sm->ptk.kck_len, ver, bssid,
1088 4 : ETH_P_EAPOL, rbuf, rlen, req->key_mic);
1089 :
1090 4 : peerkey->next = sm->peerkey;
1091 4 : sm->peerkey = peerkey;
1092 :
1093 4 : return 0;
1094 : }
1095 :
1096 :
1097 : /**
1098 : * peerkey_deinit - Free PeerKey values
1099 : * @sm: Pointer to WPA state machine data from wpa_sm_init()
1100 : */
1101 4044 : void peerkey_deinit(struct wpa_sm *sm)
1102 : {
1103 4044 : struct wpa_peerkey *prev, *peerkey = sm->peerkey;
1104 8093 : while (peerkey) {
1105 5 : prev = peerkey;
1106 5 : peerkey = peerkey->next;
1107 5 : wpa_supplicant_peerkey_free(sm, prev);
1108 : }
1109 4044 : sm->peerkey = NULL;
1110 4044 : }
1111 :
1112 :
1113 4 : void peerkey_rx_eapol_4way(struct wpa_sm *sm, struct wpa_peerkey *peerkey,
1114 : struct wpa_eapol_key *key, u16 key_info, u16 ver,
1115 : const u8 *key_data, size_t key_data_len)
1116 : {
1117 4 : if ((key_info & (WPA_KEY_INFO_MIC | WPA_KEY_INFO_ACK)) ==
1118 : (WPA_KEY_INFO_MIC | WPA_KEY_INFO_ACK)) {
1119 : /* 3/4 STK 4-Way Handshake */
1120 1 : wpa_supplicant_process_stk_3_of_4(sm, peerkey, key, ver,
1121 : key_data, key_data_len);
1122 3 : } else if (key_info & WPA_KEY_INFO_ACK) {
1123 : /* 1/4 STK 4-Way Handshake */
1124 1 : wpa_supplicant_process_stk_1_of_4(sm, peerkey, key, ver,
1125 : key_data, key_data_len);
1126 2 : } else if (key_info & WPA_KEY_INFO_SECURE) {
1127 : /* 4/4 STK 4-Way Handshake */
1128 1 : wpa_supplicant_process_stk_4_of_4(sm, peerkey, key, ver);
1129 : } else {
1130 : /* 2/4 STK 4-Way Handshake */
1131 1 : wpa_supplicant_process_stk_2_of_4(sm, peerkey, key, ver,
1132 : key_data, key_data_len);
1133 : }
1134 4 : }
1135 :
1136 :
1137 8 : void peerkey_rx_eapol_smk(struct wpa_sm *sm, const u8 *src_addr,
1138 : struct wpa_eapol_key *key, size_t extra_len,
1139 : u16 key_info, u16 ver)
1140 : {
1141 8 : if (key_info & WPA_KEY_INFO_ERROR) {
1142 : /* SMK Error */
1143 3 : wpa_supplicant_process_smk_error(sm, src_addr, key, extra_len);
1144 5 : } else if (key_info & WPA_KEY_INFO_ACK) {
1145 : /* SMK M2 */
1146 3 : wpa_supplicant_process_smk_m2(sm, src_addr, key, extra_len,
1147 : ver);
1148 : } else {
1149 : /* SMK M4 or M5 */
1150 2 : wpa_supplicant_process_smk_m45(sm, src_addr, key, extra_len,
1151 : ver);
1152 : }
1153 8 : }
1154 :
1155 : #endif /* CONFIG_PEERKEY */
|
