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,u16 reason_code)196 static void supp_deauthenticate(void * ctx, u16 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,size_t * psk_len,int * vlan_id)261 static const u8 * auth_get_psk(void *ctx, const u8 *addr,
262 const u8 *p2p_dev_addr, const u8 *prev_psk,
263 size_t *psk_len, int *vlan_id)
264 {
265 struct ibss_rsn *ibss_rsn = ctx;
266
267 if (psk_len)
268 *psk_len = PMK_LEN;
269 if (vlan_id)
270 *vlan_id = 0;
271 wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
272 __func__, MAC2STR(addr), prev_psk);
273 if (prev_psk)
274 return NULL;
275 return ibss_rsn->psk;
276 }
277
278
auth_send_eapol(void * ctx,const u8 * addr,const u8 * data,size_t data_len,int encrypt)279 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
280 size_t data_len, int encrypt)
281 {
282 struct ibss_rsn *ibss_rsn = ctx;
283 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
284
285 wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
286 "encrypt=%d)",
287 __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
288
289 if (wpa_s->l2)
290 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
291 data_len);
292
293 return -1;
294 }
295
296
auth_set_key(void * ctx,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len)297 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
298 const u8 *addr, int idx, u8 *key, size_t key_len)
299 {
300 struct ibss_rsn *ibss_rsn = ctx;
301 u8 seq[6];
302
303 os_memset(seq, 0, sizeof(seq));
304
305 if (addr) {
306 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
307 " key_idx=%d)",
308 __func__, alg, MAC2STR(addr), idx);
309 } else {
310 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
311 __func__, alg, idx);
312 }
313 wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
314
315 if (idx == 0) {
316 if (addr) {
317 struct ibss_rsn_peer *peer;
318 peer = ibss_rsn_get_peer(ibss_rsn, addr);
319 if (peer) {
320 peer->authentication_status |=
321 IBSS_RSN_SET_PTK_AUTH;
322 ibss_check_rsn_completed(peer);
323 }
324 }
325 /*
326 * In IBSS RSN, the pairwise key from the 4-way handshake
327 * initiated by the peer with highest MAC address is used.
328 */
329 if (addr == NULL ||
330 os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
331 wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
332 return 0;
333 }
334 }
335
336 return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
337 1, seq, 6, key, key_len);
338 }
339
340
ibss_rsn_disconnect(void * ctx,const u8 * addr,u16 reason)341 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
342 {
343 struct ibss_rsn *ibss_rsn = ctx;
344 wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
345 }
346
347
auth_for_each_sta(void * ctx,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)348 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
349 void *ctx),
350 void *cb_ctx)
351 {
352 struct ibss_rsn *ibss_rsn = ctx;
353 struct ibss_rsn_peer *peer;
354
355 wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
356
357 for (peer = ibss_rsn->peers; peer; peer = peer->next) {
358 if (peer->auth && cb(peer->auth, cb_ctx))
359 return 1;
360 }
361
362 return 0;
363 }
364
365
ibss_set_sta_authorized(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int authorized)366 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
367 struct ibss_rsn_peer *peer, int authorized)
368 {
369 int res;
370
371 if (authorized) {
372 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
373 WPA_STA_AUTHORIZED,
374 WPA_STA_AUTHORIZED, ~0);
375 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
376 MAC2STR(peer->addr));
377 } else {
378 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
379 0, 0, ~WPA_STA_AUTHORIZED);
380 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
381 MAC2STR(peer->addr));
382 }
383
384 if (res && errno != ENOENT) {
385 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
386 "for kernel driver (errno=%d)",
387 MAC2STR(peer->addr), errno);
388 }
389 }
390
391
auth_set_eapol(void * ctx,const u8 * addr,wpa_eapol_variable var,int value)392 static void auth_set_eapol(void *ctx, const u8 *addr,
393 wpa_eapol_variable var, int value)
394 {
395 struct ibss_rsn *ibss_rsn = ctx;
396 struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
397
398 if (peer == NULL)
399 return;
400
401 switch (var) {
402 case WPA_EAPOL_authorized:
403 ibss_set_sta_authorized(ibss_rsn, peer, value);
404 break;
405 default:
406 /* do not handle any other event */
407 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
408 break;
409 }
410 }
411
412
ibss_rsn_auth_init_group(struct ibss_rsn * ibss_rsn,const u8 * own_addr,struct wpa_ssid * ssid)413 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
414 const u8 *own_addr, struct wpa_ssid *ssid)
415 {
416 struct wpa_auth_config conf;
417 static const struct wpa_auth_callbacks cb = {
418 .logger = auth_logger,
419 .set_eapol = auth_set_eapol,
420 .send_eapol = auth_send_eapol,
421 .get_psk = auth_get_psk,
422 .set_key = auth_set_key,
423 .for_each_sta = auth_for_each_sta,
424 .disconnect = ibss_rsn_disconnect,
425 };
426
427 wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
428
429 os_memset(&conf, 0, sizeof(conf));
430 conf.wpa = 2;
431 conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
432 conf.wpa_pairwise = WPA_CIPHER_CCMP;
433 conf.rsn_pairwise = WPA_CIPHER_CCMP;
434 conf.wpa_group = WPA_CIPHER_CCMP;
435 conf.eapol_version = 2;
436 conf.wpa_group_rekey = ssid->group_rekey ? ssid->group_rekey : 600;
437 conf.wpa_group_update_count = 4;
438 conf.wpa_pairwise_update_count = 4;
439
440 ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb, ibss_rsn);
441 if (ibss_rsn->auth_group == NULL) {
442 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
443 return -1;
444 }
445
446 wpa_init_keys(ibss_rsn->auth_group);
447
448 return 0;
449 }
450
451
ibss_rsn_auth_init(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer)452 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
453 struct ibss_rsn_peer *peer)
454 {
455 peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
456 if (peer->auth == NULL) {
457 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
458 return -1;
459 }
460
461 /* TODO: get peer RSN IE with Probe Request */
462 if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth, 0,
463 (u8 *) "\x30\x14\x01\x00"
464 "\x00\x0f\xac\x04"
465 "\x01\x00\x00\x0f\xac\x04"
466 "\x01\x00\x00\x0f\xac\x02"
467 "\x00\x00", 22, NULL, 0, NULL, 0) !=
468 WPA_IE_OK) {
469 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
470 return -1;
471 }
472
473 if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
474 return -1;
475
476 if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
477 return -1;
478
479 return 0;
480 }
481
482
ibss_rsn_send_auth(struct ibss_rsn * ibss_rsn,const u8 * da,int seq)483 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
484 {
485 struct ieee80211_mgmt auth;
486 const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
487 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
488
489 if (wpa_s->driver->send_frame == NULL)
490 return -1;
491
492 os_memset(&auth, 0, sizeof(auth));
493
494 auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
495 WLAN_FC_STYPE_AUTH);
496 os_memcpy(auth.da, da, ETH_ALEN);
497 os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
498 os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
499
500 auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
501 auth.u.auth.auth_transaction = host_to_le16(seq);
502 auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
503
504 wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
505 seq, MAC2STR(da));
506
507 return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth,
508 auth_length, 0);
509 }
510
511
ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)512 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
513 {
514 return peer->authentication_status &
515 (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
516 }
517
518
519 static struct ibss_rsn_peer *
ibss_rsn_peer_init(struct ibss_rsn * ibss_rsn,const u8 * addr)520 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
521 {
522 struct ibss_rsn_peer *peer;
523 if (ibss_rsn == NULL)
524 return NULL;
525
526 peer = ibss_rsn_get_peer(ibss_rsn, addr);
527 if (peer) {
528 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
529 " already running", MAC2STR(addr));
530 return peer;
531 }
532
533 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
534 MAC2STR(addr));
535
536 peer = os_zalloc(sizeof(*peer));
537 if (peer == NULL) {
538 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
539 return NULL;
540 }
541
542 peer->ibss_rsn = ibss_rsn;
543 os_memcpy(peer->addr, addr, ETH_ALEN);
544 peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
545
546 if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
547 ibss_rsn->psk) < 0) {
548 ibss_rsn_free(peer);
549 return NULL;
550 }
551
552 peer->next = ibss_rsn->peers;
553 ibss_rsn->peers = peer;
554
555 return peer;
556 }
557
558
ibss_rsn_auth_timeout(void * eloop_ctx,void * timeout_ctx)559 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
560 {
561 struct ibss_rsn_peer *peer = eloop_ctx;
562
563 /*
564 * Assume peer does not support Authentication exchange or the frame was
565 * lost somewhere - start EAPOL Authenticator.
566 */
567 wpa_printf(MSG_DEBUG,
568 "RSN: Timeout on waiting Authentication frame response from "
569 MACSTR " - start authenticator", MAC2STR(peer->addr));
570
571 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
572 ibss_rsn_auth_init(peer->ibss_rsn, peer);
573 }
574
575
ibss_rsn_start(struct ibss_rsn * ibss_rsn,const u8 * addr)576 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
577 {
578 struct ibss_rsn_peer *peer;
579 int res;
580
581 if (!ibss_rsn)
582 return -1;
583
584 /* if the peer already exists, exit immediately */
585 peer = ibss_rsn_get_peer(ibss_rsn, addr);
586 if (peer)
587 return 0;
588
589 peer = ibss_rsn_peer_init(ibss_rsn, addr);
590 if (peer == NULL)
591 return -1;
592
593 /* Open Authentication: send first Authentication frame */
594 res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
595 if (res) {
596 /*
597 * The driver may not support Authentication frame exchange in
598 * IBSS. Ignore authentication and go through EAPOL exchange.
599 */
600 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
601 return ibss_rsn_auth_init(ibss_rsn, peer);
602 } else {
603 os_get_reltime(&peer->own_auth_tx);
604 eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
605 }
606
607 return 0;
608 }
609
610
ibss_rsn_peer_authenticated(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int reason)611 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
612 struct ibss_rsn_peer *peer, int reason)
613 {
614 int already_started;
615
616 if (ibss_rsn == NULL || peer == NULL)
617 return -1;
618
619 already_started = ibss_rsn_is_auth_started(peer);
620 peer->authentication_status |= reason;
621
622 if (already_started) {
623 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
624 "started for peer " MACSTR, MAC2STR(peer->addr));
625 return 0;
626 }
627
628 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
629 "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
630
631 return ibss_rsn_auth_init(ibss_rsn, peer);
632 }
633
634
ibss_rsn_stop(struct ibss_rsn * ibss_rsn,const u8 * peermac)635 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
636 {
637 struct ibss_rsn_peer *peer, *prev;
638
639 if (ibss_rsn == NULL)
640 return;
641
642 if (peermac == NULL) {
643 /* remove all peers */
644 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
645 peer = ibss_rsn->peers;
646 while (peer) {
647 prev = peer;
648 peer = peer->next;
649 ibss_rsn_free(prev);
650 ibss_rsn->peers = peer;
651 }
652 } else {
653 /* remove specific peer */
654 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
655 __func__, MAC2STR(peermac));
656
657 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
658 prev = peer, peer = peer->next) {
659 if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
660 if (prev == NULL)
661 ibss_rsn->peers = peer->next;
662 else
663 prev->next = peer->next;
664 ibss_rsn_free(peer);
665 wpa_printf(MSG_DEBUG, "%s: Successfully "
666 "removed a specific peer",
667 __func__);
668 break;
669 }
670 }
671 }
672 }
673
674
ibss_rsn_init(struct wpa_supplicant * wpa_s,struct wpa_ssid * ssid)675 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s,
676 struct wpa_ssid *ssid)
677 {
678 struct ibss_rsn *ibss_rsn;
679
680 ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
681 if (ibss_rsn == NULL)
682 return NULL;
683 ibss_rsn->wpa_s = wpa_s;
684
685 if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr, ssid) < 0) {
686 ibss_rsn_deinit(ibss_rsn);
687 return NULL;
688 }
689
690 return ibss_rsn;
691 }
692
693
ibss_rsn_deinit(struct ibss_rsn * ibss_rsn)694 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
695 {
696 struct ibss_rsn_peer *peer, *prev;
697
698 if (ibss_rsn == NULL)
699 return;
700
701 peer = ibss_rsn->peers;
702 while (peer) {
703 prev = peer;
704 peer = peer->next;
705 ibss_rsn_free(prev);
706 }
707
708 if (ibss_rsn->auth_group)
709 wpa_deinit(ibss_rsn->auth_group);
710 os_free(ibss_rsn);
711
712 }
713
714
ibss_rsn_eapol_dst_supp(const u8 * buf,size_t len)715 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
716 {
717 const struct ieee802_1x_hdr *hdr;
718 const struct wpa_eapol_key *key;
719 u16 key_info;
720 size_t plen;
721
722 /* TODO: Support other EAPOL packets than just EAPOL-Key */
723
724 if (len < sizeof(*hdr) + sizeof(*key))
725 return -1;
726
727 hdr = (const struct ieee802_1x_hdr *) buf;
728 key = (const struct wpa_eapol_key *) (hdr + 1);
729 plen = be_to_host16(hdr->length);
730
731 if (hdr->version < EAPOL_VERSION) {
732 /* TODO: backwards compatibility */
733 }
734 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
735 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
736 "not a Key frame", hdr->type);
737 return -1;
738 }
739 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
740 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
741 "invalid (frame size %lu)",
742 (unsigned long) plen, (unsigned long) len);
743 return -1;
744 }
745
746 if (key->type != EAPOL_KEY_TYPE_RSN) {
747 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
748 "discarded", key->type);
749 return -1;
750 }
751
752 key_info = WPA_GET_BE16(key->key_info);
753
754 return !!(key_info & WPA_KEY_INFO_ACK);
755 }
756
757
ibss_rsn_process_rx_eapol(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * buf,size_t len)758 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
759 struct ibss_rsn_peer *peer,
760 const u8 *buf, size_t len)
761 {
762 int supp;
763 u8 *tmp;
764
765 supp = ibss_rsn_eapol_dst_supp(buf, len);
766 if (supp < 0)
767 return -1;
768
769 tmp = os_memdup(buf, len);
770 if (tmp == NULL)
771 return -1;
772 if (supp) {
773 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
774 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
775 MACSTR, MAC2STR(peer->addr));
776 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
777 } else {
778 if (ibss_rsn_is_auth_started(peer) == 0) {
779 wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
780 "Authenticator dropped as " MACSTR " is not "
781 "authenticated", MAC2STR(peer->addr));
782 os_free(tmp);
783 return -1;
784 }
785
786 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
787 "from "MACSTR, MAC2STR(peer->addr));
788 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
789 }
790 os_free(tmp);
791
792 return 1;
793 }
794
795
ibss_rsn_rx_eapol(struct ibss_rsn * ibss_rsn,const u8 * src_addr,const u8 * buf,size_t len)796 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
797 const u8 *buf, size_t len)
798 {
799 struct ibss_rsn_peer *peer;
800
801 if (ibss_rsn == NULL)
802 return -1;
803
804 peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
805 if (peer)
806 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
807
808 if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
809 /*
810 * Create new IBSS peer based on an EAPOL message from the peer
811 * Authenticator.
812 */
813 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
814 if (peer == NULL)
815 return -1;
816
817 /* assume the peer is authenticated already */
818 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
819 MACSTR, MAC2STR(src_addr));
820 ibss_rsn_peer_authenticated(ibss_rsn, peer,
821 IBSS_RSN_AUTH_EAPOL_BY_US);
822
823 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
824 buf, len);
825 }
826
827 return 0;
828 }
829
ibss_rsn_set_psk(struct ibss_rsn * ibss_rsn,const u8 * psk)830 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
831 {
832 if (ibss_rsn == NULL)
833 return;
834 os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
835 }
836
837
ibss_rsn_handle_auth_1_of_2(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * addr)838 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
839 struct ibss_rsn_peer *peer,
840 const u8* addr)
841 {
842 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
843 MAC2STR(addr));
844
845 if (peer &&
846 peer->authentication_status & (IBSS_RSN_SET_PTK_SUPP |
847 IBSS_RSN_SET_PTK_AUTH)) {
848 /* Clear the TK for this pair to allow recovery from the case
849 * where the peer STA has restarted and lost its key while we
850 * still have a pairwise key configured. */
851 wpa_printf(MSG_DEBUG, "RSN: Clear pairwise key for peer "
852 MACSTR, MAC2STR(addr));
853 wpa_drv_set_key(ibss_rsn->wpa_s, WPA_ALG_NONE, addr, 0, 0,
854 NULL, 0, NULL, 0);
855 }
856
857 if (peer &&
858 peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
859 if (peer->own_auth_tx.sec) {
860 struct os_reltime now, diff;
861 os_get_reltime(&now);
862 os_reltime_sub(&now, &peer->own_auth_tx, &diff);
863 if (diff.sec == 0 && diff.usec < 500000) {
864 wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
865 (int) diff.usec);
866 goto skip_reinit;
867 }
868 }
869 /*
870 * A peer sent us an Authentication frame even though it already
871 * started an EAPOL session. We should reinit state machines
872 * here, but it's much more complicated than just deleting and
873 * recreating the state machine
874 */
875 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
876 MACSTR, MAC2STR(addr));
877
878 ibss_rsn_stop(ibss_rsn, addr);
879 peer = NULL;
880 }
881
882 if (!peer) {
883 peer = ibss_rsn_peer_init(ibss_rsn, addr);
884 if (!peer)
885 return;
886
887 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
888 MAC2STR(addr));
889 }
890
891 skip_reinit:
892 /* reply with an Authentication frame now, before sending an EAPOL */
893 ibss_rsn_send_auth(ibss_rsn, addr, 2);
894 /* no need to start another AUTH challenge in the other way.. */
895 ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
896 }
897
898
ibss_rsn_handle_auth(struct ibss_rsn * ibss_rsn,const u8 * auth_frame,size_t len)899 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
900 size_t len)
901 {
902 const struct ieee80211_mgmt *header;
903 struct ibss_rsn_peer *peer;
904 size_t auth_length;
905
906 header = (const struct ieee80211_mgmt *) auth_frame;
907 auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
908
909 if (ibss_rsn == NULL || len < auth_length)
910 return;
911
912 if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
913 le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
914 return;
915
916 peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
917
918 switch (le_to_host16(header->u.auth.auth_transaction)) {
919 case 1:
920 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
921 break;
922 case 2:
923 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
924 MACSTR, MAC2STR(header->sa));
925 if (!peer) {
926 wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
927 "unknown STA " MACSTR, MAC2STR(header->sa));
928 break;
929 }
930
931 /* authentication has been completed */
932 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
933 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
934 MAC2STR(header->sa));
935 ibss_rsn_peer_authenticated(ibss_rsn, peer,
936 IBSS_RSN_AUTH_BY_US);
937 break;
938 }
939 }
940