1 /*
2 * wpa_supplicant - IBSS RSN
3 * Copyright (c) 2009-2013, 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 #include "common.h"
12 #include "common/wpa_ctrl.h"
13 #include "utils/eloop.h"
14 #include "l2_packet/l2_packet.h"
15 #include "rsn_supp/wpa.h"
16 #include "rsn_supp/wpa_ie.h"
17 #include "ap/wpa_auth.h"
18 #include "wpa_supplicant_i.h"
19 #include "driver_i.h"
20 #include "common/ieee802_11_defs.h"
21 #include "ibss_rsn.h"
22
23
24 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx);
25
26
ibss_rsn_get_peer(struct ibss_rsn * ibss_rsn,const u8 * addr)27 static struct ibss_rsn_peer * ibss_rsn_get_peer(struct ibss_rsn *ibss_rsn,
28 const u8 *addr)
29 {
30 struct ibss_rsn_peer *peer;
31
32 for (peer = ibss_rsn->peers; peer; peer = peer->next)
33 if (os_memcmp(addr, peer->addr, ETH_ALEN) == 0)
34 break;
35 return peer;
36 }
37
38
ibss_rsn_free(struct ibss_rsn_peer * peer)39 static void ibss_rsn_free(struct ibss_rsn_peer *peer)
40 {
41 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
42 wpa_auth_sta_deinit(peer->auth);
43 wpa_sm_deinit(peer->supp);
44 os_free(peer);
45 }
46
47
supp_set_state(void * ctx,enum wpa_states state)48 static void supp_set_state(void *ctx, enum wpa_states state)
49 {
50 struct ibss_rsn_peer *peer = ctx;
51 peer->supp_state = state;
52 }
53
54
supp_get_state(void * ctx)55 static enum wpa_states supp_get_state(void *ctx)
56 {
57 struct ibss_rsn_peer *peer = ctx;
58 return peer->supp_state;
59 }
60
61
supp_ether_send(void * ctx,const u8 * dest,u16 proto,const u8 * buf,size_t len)62 static int supp_ether_send(void *ctx, const u8 *dest, u16 proto, const u8 *buf,
63 size_t len)
64 {
65 struct ibss_rsn_peer *peer = ctx;
66 struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
67
68 wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR " proto=0x%04x "
69 "len=%lu)",
70 __func__, MAC2STR(dest), proto, (unsigned long) len);
71
72 if (wpa_s->l2)
73 return l2_packet_send(wpa_s->l2, dest, proto, buf, len);
74
75 return -1;
76 }
77
78
supp_alloc_eapol(void * ctx,u8 type,const void * data,u16 data_len,size_t * msg_len,void ** data_pos)79 static u8 * supp_alloc_eapol(void *ctx, u8 type, const void *data,
80 u16 data_len, size_t *msg_len, void **data_pos)
81 {
82 struct ieee802_1x_hdr *hdr;
83
84 wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)",
85 __func__, type, data_len);
86
87 *msg_len = sizeof(*hdr) + data_len;
88 hdr = os_malloc(*msg_len);
89 if (hdr == NULL)
90 return NULL;
91
92 hdr->version = 2;
93 hdr->type = type;
94 hdr->length = host_to_be16(data_len);
95
96 if (data)
97 os_memcpy(hdr + 1, data, data_len);
98 else
99 os_memset(hdr + 1, 0, data_len);
100
101 if (data_pos)
102 *data_pos = hdr + 1;
103
104 return (u8 *) hdr;
105 }
106
107
supp_get_beacon_ie(void * ctx)108 static int supp_get_beacon_ie(void *ctx)
109 {
110 struct ibss_rsn_peer *peer = ctx;
111
112 wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
113 /* TODO: get correct RSN IE */
114 return wpa_sm_set_ap_rsn_ie(peer->supp,
115 (u8 *) "\x30\x14\x01\x00"
116 "\x00\x0f\xac\x04"
117 "\x01\x00\x00\x0f\xac\x04"
118 "\x01\x00\x00\x0f\xac\x02"
119 "\x00\x00", 22);
120 }
121
122
ibss_check_rsn_completed(struct ibss_rsn_peer * peer)123 static void ibss_check_rsn_completed(struct ibss_rsn_peer *peer)
124 {
125 struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
126
127 if ((peer->authentication_status &
128 (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH)) !=
129 (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH))
130 return;
131 if (peer->authentication_status & IBSS_RSN_REPORTED_PTK)
132 return;
133 peer->authentication_status |= IBSS_RSN_REPORTED_PTK;
134 wpa_msg(wpa_s, MSG_INFO, IBSS_RSN_COMPLETED MACSTR,
135 MAC2STR(peer->addr));
136 }
137
138
supp_set_key(void * ctx,enum wpa_alg alg,const u8 * addr,int key_idx,int set_tx,const u8 * seq,size_t seq_len,const u8 * key,size_t key_len)139 static int supp_set_key(void *ctx, enum wpa_alg alg,
140 const u8 *addr, int key_idx, int set_tx,
141 const u8 *seq, size_t seq_len,
142 const u8 *key, size_t key_len)
143 {
144 struct ibss_rsn_peer *peer = ctx;
145
146 wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d "
147 "set_tx=%d)",
148 __func__, alg, MAC2STR(addr), key_idx, set_tx);
149 wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len);
150 wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len);
151
152 if (key_idx == 0) {
153 peer->authentication_status |= IBSS_RSN_SET_PTK_SUPP;
154 ibss_check_rsn_completed(peer);
155 /*
156 * In IBSS RSN, the pairwise key from the 4-way handshake
157 * initiated by the peer with highest MAC address is used.
158 */
159 if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr,
160 ETH_ALEN) > 0) {
161 wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK");
162 return 0;
163 }
164 }
165
166 if (is_broadcast_ether_addr(addr))
167 addr = peer->addr;
168 return wpa_drv_set_key(peer->ibss_rsn->wpa_s, alg, addr, key_idx,
169 set_tx, seq, seq_len, key, key_len);
170 }
171
172
supp_get_network_ctx(void * ctx)173 static void * supp_get_network_ctx(void *ctx)
174 {
175 struct ibss_rsn_peer *peer = ctx;
176 return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s);
177 }
178
179
supp_mlme_setprotection(void * ctx,const u8 * addr,int protection_type,int key_type)180 static int supp_mlme_setprotection(void *ctx, const u8 *addr,
181 int protection_type, int key_type)
182 {
183 wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
184 "key_type=%d)",
185 __func__, MAC2STR(addr), protection_type, key_type);
186 return 0;
187 }
188
189
supp_cancel_auth_timeout(void * ctx)190 static void supp_cancel_auth_timeout(void *ctx)
191 {
192 wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
193 }
194
195
supp_deauthenticate(void * ctx,int reason_code)196 static void supp_deauthenticate(void * ctx, int reason_code)
197 {
198 wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
199 }
200
201
ibss_rsn_supp_init(struct ibss_rsn_peer * peer,const u8 * own_addr,const u8 * psk)202 static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
203 const u8 *psk)
204 {
205 struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
206 if (ctx == NULL)
207 return -1;
208
209 ctx->ctx = peer;
210 ctx->msg_ctx = peer->ibss_rsn->wpa_s;
211 ctx->set_state = supp_set_state;
212 ctx->get_state = supp_get_state;
213 ctx->ether_send = supp_ether_send;
214 ctx->get_beacon_ie = supp_get_beacon_ie;
215 ctx->alloc_eapol = supp_alloc_eapol;
216 ctx->set_key = supp_set_key;
217 ctx->get_network_ctx = supp_get_network_ctx;
218 ctx->mlme_setprotection = supp_mlme_setprotection;
219 ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
220 ctx->deauthenticate = supp_deauthenticate;
221 peer->supp = wpa_sm_init(ctx);
222 if (peer->supp == NULL) {
223 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
224 os_free(ctx);
225 return -1;
226 }
227
228 wpa_sm_set_own_addr(peer->supp, own_addr);
229 wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
230 wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
231 wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
232 wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
233 wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
234 wpa_sm_set_pmk(peer->supp, psk, PMK_LEN, NULL, NULL);
235
236 peer->supp_ie_len = sizeof(peer->supp_ie);
237 if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
238 &peer->supp_ie_len) < 0) {
239 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
240 " failed");
241 return -1;
242 }
243
244 wpa_sm_notify_assoc(peer->supp, peer->addr);
245
246 return 0;
247 }
248
249
auth_logger(void * ctx,const u8 * addr,logger_level level,const char * txt)250 static void auth_logger(void *ctx, const u8 *addr, logger_level level,
251 const char *txt)
252 {
253 if (addr)
254 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
255 MAC2STR(addr), txt);
256 else
257 wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
258 }
259
260
auth_get_psk(void * ctx,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk)261 static const u8 * auth_get_psk(void *ctx, const u8 *addr,
262 const u8 *p2p_dev_addr, const u8 *prev_psk)
263 {
264 struct ibss_rsn *ibss_rsn = ctx;
265 wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
266 __func__, MAC2STR(addr), prev_psk);
267 if (prev_psk)
268 return NULL;
269 return ibss_rsn->psk;
270 }
271
272
auth_send_eapol(void * ctx,const u8 * addr,const u8 * data,size_t data_len,int encrypt)273 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
274 size_t data_len, int encrypt)
275 {
276 struct ibss_rsn *ibss_rsn = ctx;
277 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
278
279 wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
280 "encrypt=%d)",
281 __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
282
283 if (wpa_s->l2)
284 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
285 data_len);
286
287 return -1;
288 }
289
290
auth_set_key(void * ctx,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len)291 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
292 const u8 *addr, int idx, u8 *key, size_t key_len)
293 {
294 struct ibss_rsn *ibss_rsn = ctx;
295 u8 seq[6];
296
297 os_memset(seq, 0, sizeof(seq));
298
299 if (addr) {
300 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
301 " key_idx=%d)",
302 __func__, alg, MAC2STR(addr), idx);
303 } else {
304 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
305 __func__, alg, idx);
306 }
307 wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
308
309 if (idx == 0) {
310 if (addr) {
311 struct ibss_rsn_peer *peer;
312 peer = ibss_rsn_get_peer(ibss_rsn, addr);
313 if (peer) {
314 peer->authentication_status |=
315 IBSS_RSN_SET_PTK_AUTH;
316 ibss_check_rsn_completed(peer);
317 }
318 }
319 /*
320 * In IBSS RSN, the pairwise key from the 4-way handshake
321 * initiated by the peer with highest MAC address is used.
322 */
323 if (addr == NULL ||
324 os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
325 wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
326 return 0;
327 }
328 }
329
330 return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
331 1, seq, 6, key, key_len);
332 }
333
334
ibss_rsn_disconnect(void * ctx,const u8 * addr,u16 reason)335 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
336 {
337 struct ibss_rsn *ibss_rsn = ctx;
338 wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
339 }
340
341
auth_for_each_sta(void * ctx,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)342 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
343 void *ctx),
344 void *cb_ctx)
345 {
346 struct ibss_rsn *ibss_rsn = ctx;
347 struct ibss_rsn_peer *peer;
348
349 wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
350
351 for (peer = ibss_rsn->peers; peer; peer = peer->next) {
352 if (peer->auth && cb(peer->auth, cb_ctx))
353 return 1;
354 }
355
356 return 0;
357 }
358
359
ibss_set_sta_authorized(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int authorized)360 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
361 struct ibss_rsn_peer *peer, int authorized)
362 {
363 int res;
364
365 if (authorized) {
366 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
367 WPA_STA_AUTHORIZED,
368 WPA_STA_AUTHORIZED, ~0);
369 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
370 MAC2STR(peer->addr));
371 } else {
372 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
373 0, 0, ~WPA_STA_AUTHORIZED);
374 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
375 MAC2STR(peer->addr));
376 }
377
378 if (res && errno != ENOENT) {
379 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
380 "for kernel driver (errno=%d)",
381 MAC2STR(peer->addr), errno);
382 }
383 }
384
385
auth_set_eapol(void * ctx,const u8 * addr,wpa_eapol_variable var,int value)386 static void auth_set_eapol(void *ctx, const u8 *addr,
387 wpa_eapol_variable var, int value)
388 {
389 struct ibss_rsn *ibss_rsn = ctx;
390 struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
391
392 if (peer == NULL)
393 return;
394
395 switch (var) {
396 case WPA_EAPOL_authorized:
397 ibss_set_sta_authorized(ibss_rsn, peer, value);
398 break;
399 default:
400 /* do not handle any other event */
401 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
402 break;
403 }
404 }
405
406
ibss_rsn_auth_init_group(struct ibss_rsn * ibss_rsn,const u8 * own_addr,struct wpa_ssid * ssid)407 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
408 const u8 *own_addr, struct wpa_ssid *ssid)
409 {
410 struct wpa_auth_config conf;
411 static const struct wpa_auth_callbacks cb = {
412 .logger = auth_logger,
413 .set_eapol = auth_set_eapol,
414 .send_eapol = auth_send_eapol,
415 .get_psk = auth_get_psk,
416 .set_key = auth_set_key,
417 .for_each_sta = auth_for_each_sta,
418 .disconnect = ibss_rsn_disconnect,
419 };
420
421 wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
422
423 os_memset(&conf, 0, sizeof(conf));
424 conf.wpa = 2;
425 conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
426 conf.wpa_pairwise = WPA_CIPHER_CCMP;
427 conf.rsn_pairwise = WPA_CIPHER_CCMP;
428 conf.wpa_group = WPA_CIPHER_CCMP;
429 conf.eapol_version = 2;
430 conf.wpa_group_rekey = ssid->group_rekey ? ssid->group_rekey : 600;
431 conf.wpa_group_update_count = 4;
432 conf.wpa_pairwise_update_count = 4;
433
434 ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb, ibss_rsn);
435 if (ibss_rsn->auth_group == NULL) {
436 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
437 return -1;
438 }
439
440 wpa_init_keys(ibss_rsn->auth_group);
441
442 return 0;
443 }
444
445
ibss_rsn_auth_init(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer)446 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
447 struct ibss_rsn_peer *peer)
448 {
449 peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
450 if (peer->auth == NULL) {
451 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
452 return -1;
453 }
454
455 /* TODO: get peer RSN IE with Probe Request */
456 if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth,
457 (u8 *) "\x30\x14\x01\x00"
458 "\x00\x0f\xac\x04"
459 "\x01\x00\x00\x0f\xac\x04"
460 "\x01\x00\x00\x0f\xac\x02"
461 "\x00\x00", 22, NULL, 0) !=
462 WPA_IE_OK) {
463 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
464 return -1;
465 }
466
467 if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
468 return -1;
469
470 if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
471 return -1;
472
473 return 0;
474 }
475
476
ibss_rsn_send_auth(struct ibss_rsn * ibss_rsn,const u8 * da,int seq)477 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
478 {
479 struct ieee80211_mgmt auth;
480 const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
481 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
482
483 if (wpa_s->driver->send_frame == NULL)
484 return -1;
485
486 os_memset(&auth, 0, sizeof(auth));
487
488 auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
489 WLAN_FC_STYPE_AUTH);
490 os_memcpy(auth.da, da, ETH_ALEN);
491 os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
492 os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
493
494 auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
495 auth.u.auth.auth_transaction = host_to_le16(seq);
496 auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
497
498 wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
499 seq, MAC2STR(da));
500
501 return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth,
502 auth_length, 0);
503 }
504
505
ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)506 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
507 {
508 return peer->authentication_status &
509 (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
510 }
511
512
513 static struct ibss_rsn_peer *
ibss_rsn_peer_init(struct ibss_rsn * ibss_rsn,const u8 * addr)514 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
515 {
516 struct ibss_rsn_peer *peer;
517 if (ibss_rsn == NULL)
518 return NULL;
519
520 peer = ibss_rsn_get_peer(ibss_rsn, addr);
521 if (peer) {
522 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
523 " already running", MAC2STR(addr));
524 return peer;
525 }
526
527 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
528 MAC2STR(addr));
529
530 peer = os_zalloc(sizeof(*peer));
531 if (peer == NULL) {
532 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
533 return NULL;
534 }
535
536 peer->ibss_rsn = ibss_rsn;
537 os_memcpy(peer->addr, addr, ETH_ALEN);
538 peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
539
540 if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
541 ibss_rsn->psk) < 0) {
542 ibss_rsn_free(peer);
543 return NULL;
544 }
545
546 peer->next = ibss_rsn->peers;
547 ibss_rsn->peers = peer;
548
549 return peer;
550 }
551
552
ibss_rsn_auth_timeout(void * eloop_ctx,void * timeout_ctx)553 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
554 {
555 struct ibss_rsn_peer *peer = eloop_ctx;
556
557 /*
558 * Assume peer does not support Authentication exchange or the frame was
559 * lost somewhere - start EAPOL Authenticator.
560 */
561 wpa_printf(MSG_DEBUG,
562 "RSN: Timeout on waiting Authentication frame response from "
563 MACSTR " - start authenticator", MAC2STR(peer->addr));
564
565 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
566 ibss_rsn_auth_init(peer->ibss_rsn, peer);
567 }
568
569
ibss_rsn_start(struct ibss_rsn * ibss_rsn,const u8 * addr)570 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
571 {
572 struct ibss_rsn_peer *peer;
573 int res;
574
575 if (!ibss_rsn)
576 return -1;
577
578 /* if the peer already exists, exit immediately */
579 peer = ibss_rsn_get_peer(ibss_rsn, addr);
580 if (peer)
581 return 0;
582
583 peer = ibss_rsn_peer_init(ibss_rsn, addr);
584 if (peer == NULL)
585 return -1;
586
587 /* Open Authentication: send first Authentication frame */
588 res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
589 if (res) {
590 /*
591 * The driver may not support Authentication frame exchange in
592 * IBSS. Ignore authentication and go through EAPOL exchange.
593 */
594 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
595 return ibss_rsn_auth_init(ibss_rsn, peer);
596 } else {
597 os_get_reltime(&peer->own_auth_tx);
598 eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
599 }
600
601 return 0;
602 }
603
604
ibss_rsn_peer_authenticated(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int reason)605 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
606 struct ibss_rsn_peer *peer, int reason)
607 {
608 int already_started;
609
610 if (ibss_rsn == NULL || peer == NULL)
611 return -1;
612
613 already_started = ibss_rsn_is_auth_started(peer);
614 peer->authentication_status |= reason;
615
616 if (already_started) {
617 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
618 "started for peer " MACSTR, MAC2STR(peer->addr));
619 return 0;
620 }
621
622 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
623 "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
624
625 return ibss_rsn_auth_init(ibss_rsn, peer);
626 }
627
628
ibss_rsn_stop(struct ibss_rsn * ibss_rsn,const u8 * peermac)629 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
630 {
631 struct ibss_rsn_peer *peer, *prev;
632
633 if (ibss_rsn == NULL)
634 return;
635
636 if (peermac == NULL) {
637 /* remove all peers */
638 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
639 peer = ibss_rsn->peers;
640 while (peer) {
641 prev = peer;
642 peer = peer->next;
643 ibss_rsn_free(prev);
644 ibss_rsn->peers = peer;
645 }
646 } else {
647 /* remove specific peer */
648 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
649 __func__, MAC2STR(peermac));
650
651 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
652 prev = peer, peer = peer->next) {
653 if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
654 if (prev == NULL)
655 ibss_rsn->peers = peer->next;
656 else
657 prev->next = peer->next;
658 ibss_rsn_free(peer);
659 wpa_printf(MSG_DEBUG, "%s: Successfully "
660 "removed a specific peer",
661 __func__);
662 break;
663 }
664 }
665 }
666 }
667
668
ibss_rsn_init(struct wpa_supplicant * wpa_s,struct wpa_ssid * ssid)669 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s,
670 struct wpa_ssid *ssid)
671 {
672 struct ibss_rsn *ibss_rsn;
673
674 ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
675 if (ibss_rsn == NULL)
676 return NULL;
677 ibss_rsn->wpa_s = wpa_s;
678
679 if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr, ssid) < 0) {
680 ibss_rsn_deinit(ibss_rsn);
681 return NULL;
682 }
683
684 return ibss_rsn;
685 }
686
687
ibss_rsn_deinit(struct ibss_rsn * ibss_rsn)688 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
689 {
690 struct ibss_rsn_peer *peer, *prev;
691
692 if (ibss_rsn == NULL)
693 return;
694
695 peer = ibss_rsn->peers;
696 while (peer) {
697 prev = peer;
698 peer = peer->next;
699 ibss_rsn_free(prev);
700 }
701
702 if (ibss_rsn->auth_group)
703 wpa_deinit(ibss_rsn->auth_group);
704 os_free(ibss_rsn);
705
706 }
707
708
ibss_rsn_eapol_dst_supp(const u8 * buf,size_t len)709 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
710 {
711 const struct ieee802_1x_hdr *hdr;
712 const struct wpa_eapol_key *key;
713 u16 key_info;
714 size_t plen;
715
716 /* TODO: Support other EAPOL packets than just EAPOL-Key */
717
718 if (len < sizeof(*hdr) + sizeof(*key))
719 return -1;
720
721 hdr = (const struct ieee802_1x_hdr *) buf;
722 key = (const struct wpa_eapol_key *) (hdr + 1);
723 plen = be_to_host16(hdr->length);
724
725 if (hdr->version < EAPOL_VERSION) {
726 /* TODO: backwards compatibility */
727 }
728 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
729 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
730 "not a Key frame", hdr->type);
731 return -1;
732 }
733 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
734 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
735 "invalid (frame size %lu)",
736 (unsigned long) plen, (unsigned long) len);
737 return -1;
738 }
739
740 if (key->type != EAPOL_KEY_TYPE_RSN) {
741 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
742 "discarded", key->type);
743 return -1;
744 }
745
746 key_info = WPA_GET_BE16(key->key_info);
747
748 return !!(key_info & WPA_KEY_INFO_ACK);
749 }
750
751
ibss_rsn_process_rx_eapol(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * buf,size_t len)752 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
753 struct ibss_rsn_peer *peer,
754 const u8 *buf, size_t len)
755 {
756 int supp;
757 u8 *tmp;
758
759 supp = ibss_rsn_eapol_dst_supp(buf, len);
760 if (supp < 0)
761 return -1;
762
763 tmp = os_malloc(len);
764 if (tmp == NULL)
765 return -1;
766 os_memcpy(tmp, buf, len);
767 if (supp) {
768 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
769 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
770 MACSTR, MAC2STR(peer->addr));
771 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
772 } else {
773 if (ibss_rsn_is_auth_started(peer) == 0) {
774 wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
775 "Authenticator dropped as " MACSTR " is not "
776 "authenticated", MAC2STR(peer->addr));
777 os_free(tmp);
778 return -1;
779 }
780
781 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
782 "from "MACSTR, MAC2STR(peer->addr));
783 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
784 }
785 os_free(tmp);
786
787 return 1;
788 }
789
790
ibss_rsn_rx_eapol(struct ibss_rsn * ibss_rsn,const u8 * src_addr,const u8 * buf,size_t len)791 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
792 const u8 *buf, size_t len)
793 {
794 struct ibss_rsn_peer *peer;
795
796 if (ibss_rsn == NULL)
797 return -1;
798
799 peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
800 if (peer)
801 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
802
803 if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
804 /*
805 * Create new IBSS peer based on an EAPOL message from the peer
806 * Authenticator.
807 */
808 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
809 if (peer == NULL)
810 return -1;
811
812 /* assume the peer is authenticated already */
813 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
814 MACSTR, MAC2STR(src_addr));
815 ibss_rsn_peer_authenticated(ibss_rsn, peer,
816 IBSS_RSN_AUTH_EAPOL_BY_US);
817
818 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
819 buf, len);
820 }
821
822 return 0;
823 }
824
ibss_rsn_set_psk(struct ibss_rsn * ibss_rsn,const u8 * psk)825 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
826 {
827 if (ibss_rsn == NULL)
828 return;
829 os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
830 }
831
832
ibss_rsn_handle_auth_1_of_2(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * addr)833 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
834 struct ibss_rsn_peer *peer,
835 const u8* addr)
836 {
837 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
838 MAC2STR(addr));
839
840 if (peer &&
841 peer->authentication_status & (IBSS_RSN_SET_PTK_SUPP |
842 IBSS_RSN_SET_PTK_AUTH)) {
843 /* Clear the TK for this pair to allow recovery from the case
844 * where the peer STA has restarted and lost its key while we
845 * still have a pairwise key configured. */
846 wpa_printf(MSG_DEBUG, "RSN: Clear pairwise key for peer "
847 MACSTR, MAC2STR(addr));
848 wpa_drv_set_key(ibss_rsn->wpa_s, WPA_ALG_NONE, addr, 0, 0,
849 NULL, 0, NULL, 0);
850 }
851
852 if (peer &&
853 peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
854 if (peer->own_auth_tx.sec) {
855 struct os_reltime now, diff;
856 os_get_reltime(&now);
857 os_reltime_sub(&now, &peer->own_auth_tx, &diff);
858 if (diff.sec == 0 && diff.usec < 500000) {
859 wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
860 (int) diff.usec);
861 goto skip_reinit;
862 }
863 }
864 /*
865 * A peer sent us an Authentication frame even though it already
866 * started an EAPOL session. We should reinit state machines
867 * here, but it's much more complicated than just deleting and
868 * recreating the state machine
869 */
870 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
871 MACSTR, MAC2STR(addr));
872
873 ibss_rsn_stop(ibss_rsn, addr);
874 peer = NULL;
875 }
876
877 if (!peer) {
878 peer = ibss_rsn_peer_init(ibss_rsn, addr);
879 if (!peer)
880 return;
881
882 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
883 MAC2STR(addr));
884 }
885
886 skip_reinit:
887 /* reply with an Authentication frame now, before sending an EAPOL */
888 ibss_rsn_send_auth(ibss_rsn, addr, 2);
889 /* no need to start another AUTH challenge in the other way.. */
890 ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
891 }
892
893
ibss_rsn_handle_auth(struct ibss_rsn * ibss_rsn,const u8 * auth_frame,size_t len)894 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
895 size_t len)
896 {
897 const struct ieee80211_mgmt *header;
898 struct ibss_rsn_peer *peer;
899 size_t auth_length;
900
901 header = (const struct ieee80211_mgmt *) auth_frame;
902 auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
903
904 if (ibss_rsn == NULL || len < auth_length)
905 return;
906
907 if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
908 le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
909 return;
910
911 peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
912
913 switch (le_to_host16(header->u.auth.auth_transaction)) {
914 case 1:
915 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
916 break;
917 case 2:
918 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
919 MACSTR, MAC2STR(header->sa));
920 if (!peer) {
921 wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
922 "unknown STA " MACSTR, MAC2STR(header->sa));
923 break;
924 }
925
926 /* authentication has been completed */
927 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
928 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
929 MAC2STR(header->sa));
930 ibss_rsn_peer_authenticated(ibss_rsn, peer,
931 IBSS_RSN_AUTH_BY_US);
932 break;
933 }
934 }
935