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 return -1;
225 }
226
227 wpa_sm_set_own_addr(peer->supp, own_addr);
228 wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
229 wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
230 wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
231 wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
232 wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
233 wpa_sm_set_pmk(peer->supp, psk, PMK_LEN, NULL);
234
235 peer->supp_ie_len = sizeof(peer->supp_ie);
236 if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
237 &peer->supp_ie_len) < 0) {
238 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
239 " failed");
240 return -1;
241 }
242
243 wpa_sm_notify_assoc(peer->supp, peer->addr);
244
245 return 0;
246 }
247
248
auth_logger(void * ctx,const u8 * addr,logger_level level,const char * txt)249 static void auth_logger(void *ctx, const u8 *addr, logger_level level,
250 const char *txt)
251 {
252 if (addr)
253 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
254 MAC2STR(addr), txt);
255 else
256 wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
257 }
258
259
auth_get_psk(void * ctx,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk)260 static const u8 * auth_get_psk(void *ctx, const u8 *addr,
261 const u8 *p2p_dev_addr, const u8 *prev_psk)
262 {
263 struct ibss_rsn *ibss_rsn = ctx;
264 wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
265 __func__, MAC2STR(addr), prev_psk);
266 if (prev_psk)
267 return NULL;
268 return ibss_rsn->psk;
269 }
270
271
auth_send_eapol(void * ctx,const u8 * addr,const u8 * data,size_t data_len,int encrypt)272 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
273 size_t data_len, int encrypt)
274 {
275 struct ibss_rsn *ibss_rsn = ctx;
276 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
277
278 wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
279 "encrypt=%d)",
280 __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
281
282 if (wpa_s->l2)
283 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
284 data_len);
285
286 return -1;
287 }
288
289
auth_set_key(void * ctx,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len)290 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
291 const u8 *addr, int idx, u8 *key, size_t key_len)
292 {
293 struct ibss_rsn *ibss_rsn = ctx;
294 u8 seq[6];
295
296 os_memset(seq, 0, sizeof(seq));
297
298 if (addr) {
299 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
300 " key_idx=%d)",
301 __func__, alg, MAC2STR(addr), idx);
302 } else {
303 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
304 __func__, alg, idx);
305 }
306 wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
307
308 if (idx == 0) {
309 if (addr) {
310 struct ibss_rsn_peer *peer;
311 peer = ibss_rsn_get_peer(ibss_rsn, addr);
312 if (peer) {
313 peer->authentication_status |=
314 IBSS_RSN_SET_PTK_AUTH;
315 ibss_check_rsn_completed(peer);
316 }
317 }
318 /*
319 * In IBSS RSN, the pairwise key from the 4-way handshake
320 * initiated by the peer with highest MAC address is used.
321 */
322 if (addr == NULL ||
323 os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
324 wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
325 return 0;
326 }
327 }
328
329 return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
330 1, seq, 6, key, key_len);
331 }
332
333
ibss_rsn_disconnect(void * ctx,const u8 * addr,u16 reason)334 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
335 {
336 struct ibss_rsn *ibss_rsn = ctx;
337 wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
338 }
339
340
auth_for_each_sta(void * ctx,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)341 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
342 void *ctx),
343 void *cb_ctx)
344 {
345 struct ibss_rsn *ibss_rsn = ctx;
346 struct ibss_rsn_peer *peer;
347
348 wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
349
350 for (peer = ibss_rsn->peers; peer; peer = peer->next) {
351 if (peer->auth && cb(peer->auth, cb_ctx))
352 return 1;
353 }
354
355 return 0;
356 }
357
358
ibss_set_sta_authorized(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int authorized)359 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
360 struct ibss_rsn_peer *peer, int authorized)
361 {
362 int res;
363
364 if (authorized) {
365 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
366 WPA_STA_AUTHORIZED,
367 WPA_STA_AUTHORIZED, ~0);
368 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
369 MAC2STR(peer->addr));
370 } else {
371 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
372 0, 0, ~WPA_STA_AUTHORIZED);
373 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
374 MAC2STR(peer->addr));
375 }
376
377 if (res && errno != ENOENT) {
378 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
379 "for kernel driver (errno=%d)",
380 MAC2STR(peer->addr), errno);
381 }
382 }
383
384
auth_set_eapol(void * ctx,const u8 * addr,wpa_eapol_variable var,int value)385 static void auth_set_eapol(void *ctx, const u8 *addr,
386 wpa_eapol_variable var, int value)
387 {
388 struct ibss_rsn *ibss_rsn = ctx;
389 struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
390
391 if (peer == NULL)
392 return;
393
394 switch (var) {
395 case WPA_EAPOL_authorized:
396 ibss_set_sta_authorized(ibss_rsn, peer, value);
397 break;
398 default:
399 /* do not handle any other event */
400 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
401 break;
402 }
403 }
404
405
ibss_rsn_auth_init_group(struct ibss_rsn * ibss_rsn,const u8 * own_addr)406 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
407 const u8 *own_addr)
408 {
409 struct wpa_auth_config conf;
410 struct wpa_auth_callbacks cb;
411
412 wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
413
414 os_memset(&conf, 0, sizeof(conf));
415 conf.wpa = 2;
416 conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
417 conf.wpa_pairwise = WPA_CIPHER_CCMP;
418 conf.rsn_pairwise = WPA_CIPHER_CCMP;
419 conf.wpa_group = WPA_CIPHER_CCMP;
420 conf.eapol_version = 2;
421 conf.wpa_group_rekey = 600;
422
423 os_memset(&cb, 0, sizeof(cb));
424 cb.ctx = ibss_rsn;
425 cb.logger = auth_logger;
426 cb.set_eapol = auth_set_eapol;
427 cb.send_eapol = auth_send_eapol;
428 cb.get_psk = auth_get_psk;
429 cb.set_key = auth_set_key;
430 cb.for_each_sta = auth_for_each_sta;
431 cb.disconnect = ibss_rsn_disconnect;
432
433 ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb);
434 if (ibss_rsn->auth_group == NULL) {
435 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
436 return -1;
437 }
438
439 wpa_init_keys(ibss_rsn->auth_group);
440
441 return 0;
442 }
443
444
ibss_rsn_auth_init(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer)445 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
446 struct ibss_rsn_peer *peer)
447 {
448 peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
449 if (peer->auth == NULL) {
450 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
451 return -1;
452 }
453
454 /* TODO: get peer RSN IE with Probe Request */
455 if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth,
456 (u8 *) "\x30\x14\x01\x00"
457 "\x00\x0f\xac\x04"
458 "\x01\x00\x00\x0f\xac\x04"
459 "\x01\x00\x00\x0f\xac\x02"
460 "\x00\x00", 22, NULL, 0) !=
461 WPA_IE_OK) {
462 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
463 return -1;
464 }
465
466 if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
467 return -1;
468
469 if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
470 return -1;
471
472 return 0;
473 }
474
475
ibss_rsn_send_auth(struct ibss_rsn * ibss_rsn,const u8 * da,int seq)476 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
477 {
478 struct ieee80211_mgmt auth;
479 const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
480 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
481
482 if (wpa_s->driver->send_frame == NULL)
483 return -1;
484
485 os_memset(&auth, 0, sizeof(auth));
486
487 auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
488 WLAN_FC_STYPE_AUTH);
489 os_memcpy(auth.da, da, ETH_ALEN);
490 os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
491 os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
492
493 auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
494 auth.u.auth.auth_transaction = host_to_le16(seq);
495 auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
496
497 wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
498 seq, MAC2STR(da));
499
500 return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth,
501 auth_length, 0);
502 }
503
504
ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)505 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
506 {
507 return peer->authentication_status &
508 (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
509 }
510
511
512 static struct ibss_rsn_peer *
ibss_rsn_peer_init(struct ibss_rsn * ibss_rsn,const u8 * addr)513 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
514 {
515 struct ibss_rsn_peer *peer;
516 if (ibss_rsn == NULL)
517 return NULL;
518
519 peer = ibss_rsn_get_peer(ibss_rsn, addr);
520 if (peer) {
521 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
522 " already running", MAC2STR(addr));
523 return peer;
524 }
525
526 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
527 MAC2STR(addr));
528
529 peer = os_zalloc(sizeof(*peer));
530 if (peer == NULL) {
531 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
532 return NULL;
533 }
534
535 peer->ibss_rsn = ibss_rsn;
536 os_memcpy(peer->addr, addr, ETH_ALEN);
537 peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
538
539 if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
540 ibss_rsn->psk) < 0) {
541 ibss_rsn_free(peer);
542 return NULL;
543 }
544
545 peer->next = ibss_rsn->peers;
546 ibss_rsn->peers = peer;
547
548 return peer;
549 }
550
551
ibss_rsn_auth_timeout(void * eloop_ctx,void * timeout_ctx)552 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
553 {
554 struct ibss_rsn_peer *peer = eloop_ctx;
555
556 /*
557 * Assume peer does not support Authentication exchange or the frame was
558 * lost somewhere - start EAPOL Authenticator.
559 */
560 wpa_printf(MSG_DEBUG,
561 "RSN: Timeout on waiting Authentication frame response from "
562 MACSTR " - start authenticator", MAC2STR(peer->addr));
563
564 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
565 ibss_rsn_auth_init(peer->ibss_rsn, peer);
566 }
567
568
ibss_rsn_start(struct ibss_rsn * ibss_rsn,const u8 * addr)569 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
570 {
571 struct ibss_rsn_peer *peer;
572 int res;
573
574 if (!ibss_rsn)
575 return -1;
576
577 /* if the peer already exists, exit immediately */
578 peer = ibss_rsn_get_peer(ibss_rsn, addr);
579 if (peer)
580 return 0;
581
582 peer = ibss_rsn_peer_init(ibss_rsn, addr);
583 if (peer == NULL)
584 return -1;
585
586 /* Open Authentication: send first Authentication frame */
587 res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
588 if (res) {
589 /*
590 * The driver may not support Authentication frame exchange in
591 * IBSS. Ignore authentication and go through EAPOL exchange.
592 */
593 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
594 return ibss_rsn_auth_init(ibss_rsn, peer);
595 } else {
596 os_get_reltime(&peer->own_auth_tx);
597 eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
598 }
599
600 return 0;
601 }
602
603
ibss_rsn_peer_authenticated(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int reason)604 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
605 struct ibss_rsn_peer *peer, int reason)
606 {
607 int already_started;
608
609 if (ibss_rsn == NULL || peer == NULL)
610 return -1;
611
612 already_started = ibss_rsn_is_auth_started(peer);
613 peer->authentication_status |= reason;
614
615 if (already_started) {
616 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
617 "started for peer " MACSTR, MAC2STR(peer->addr));
618 return 0;
619 }
620
621 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
622 "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
623
624 return ibss_rsn_auth_init(ibss_rsn, peer);
625 }
626
627
ibss_rsn_stop(struct ibss_rsn * ibss_rsn,const u8 * peermac)628 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
629 {
630 struct ibss_rsn_peer *peer, *prev;
631
632 if (ibss_rsn == NULL)
633 return;
634
635 if (peermac == NULL) {
636 /* remove all peers */
637 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
638 peer = ibss_rsn->peers;
639 while (peer) {
640 prev = peer;
641 peer = peer->next;
642 ibss_rsn_free(prev);
643 ibss_rsn->peers = peer;
644 }
645 } else {
646 /* remove specific peer */
647 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
648 __func__, MAC2STR(peermac));
649
650 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
651 prev = peer, peer = peer->next) {
652 if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
653 if (prev == NULL)
654 ibss_rsn->peers = peer->next;
655 else
656 prev->next = peer->next;
657 ibss_rsn_free(peer);
658 wpa_printf(MSG_DEBUG, "%s: Successfully "
659 "removed a specific peer",
660 __func__);
661 break;
662 }
663 }
664 }
665 }
666
667
ibss_rsn_init(struct wpa_supplicant * wpa_s)668 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s)
669 {
670 struct ibss_rsn *ibss_rsn;
671
672 ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
673 if (ibss_rsn == NULL)
674 return NULL;
675 ibss_rsn->wpa_s = wpa_s;
676
677 if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr) < 0) {
678 ibss_rsn_deinit(ibss_rsn);
679 return NULL;
680 }
681
682 return ibss_rsn;
683 }
684
685
ibss_rsn_deinit(struct ibss_rsn * ibss_rsn)686 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
687 {
688 struct ibss_rsn_peer *peer, *prev;
689
690 if (ibss_rsn == NULL)
691 return;
692
693 peer = ibss_rsn->peers;
694 while (peer) {
695 prev = peer;
696 peer = peer->next;
697 ibss_rsn_free(prev);
698 }
699
700 wpa_deinit(ibss_rsn->auth_group);
701 os_free(ibss_rsn);
702
703 }
704
705
ibss_rsn_eapol_dst_supp(const u8 * buf,size_t len)706 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
707 {
708 const struct ieee802_1x_hdr *hdr;
709 const struct wpa_eapol_key *key;
710 u16 key_info;
711 size_t plen;
712
713 /* TODO: Support other EAPOL packets than just EAPOL-Key */
714
715 if (len < sizeof(*hdr) + sizeof(*key))
716 return -1;
717
718 hdr = (const struct ieee802_1x_hdr *) buf;
719 key = (const struct wpa_eapol_key *) (hdr + 1);
720 plen = be_to_host16(hdr->length);
721
722 if (hdr->version < EAPOL_VERSION) {
723 /* TODO: backwards compatibility */
724 }
725 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
726 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
727 "not a Key frame", hdr->type);
728 return -1;
729 }
730 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
731 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
732 "invalid (frame size %lu)",
733 (unsigned long) plen, (unsigned long) len);
734 return -1;
735 }
736
737 if (key->type != EAPOL_KEY_TYPE_RSN) {
738 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
739 "discarded", key->type);
740 return -1;
741 }
742
743 key_info = WPA_GET_BE16(key->key_info);
744
745 return !!(key_info & WPA_KEY_INFO_ACK);
746 }
747
748
ibss_rsn_process_rx_eapol(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * buf,size_t len)749 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
750 struct ibss_rsn_peer *peer,
751 const u8 *buf, size_t len)
752 {
753 int supp;
754 u8 *tmp;
755
756 supp = ibss_rsn_eapol_dst_supp(buf, len);
757 if (supp < 0)
758 return -1;
759
760 tmp = os_malloc(len);
761 if (tmp == NULL)
762 return -1;
763 os_memcpy(tmp, buf, len);
764 if (supp) {
765 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
766 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
767 MACSTR, MAC2STR(peer->addr));
768 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
769 } else {
770 if (ibss_rsn_is_auth_started(peer) == 0) {
771 wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
772 "Authenticator dropped as " MACSTR " is not "
773 "authenticated", MAC2STR(peer->addr));
774 os_free(tmp);
775 return -1;
776 }
777
778 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
779 "from "MACSTR, MAC2STR(peer->addr));
780 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
781 }
782 os_free(tmp);
783
784 return 1;
785 }
786
787
ibss_rsn_rx_eapol(struct ibss_rsn * ibss_rsn,const u8 * src_addr,const u8 * buf,size_t len)788 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
789 const u8 *buf, size_t len)
790 {
791 struct ibss_rsn_peer *peer;
792
793 if (ibss_rsn == NULL)
794 return -1;
795
796 peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
797 if (peer)
798 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
799
800 if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
801 /*
802 * Create new IBSS peer based on an EAPOL message from the peer
803 * Authenticator.
804 */
805 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
806 if (peer == NULL)
807 return -1;
808
809 /* assume the peer is authenticated already */
810 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
811 MACSTR, MAC2STR(src_addr));
812 ibss_rsn_peer_authenticated(ibss_rsn, peer,
813 IBSS_RSN_AUTH_EAPOL_BY_US);
814
815 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
816 buf, len);
817 }
818
819 return 0;
820 }
821
ibss_rsn_set_psk(struct ibss_rsn * ibss_rsn,const u8 * psk)822 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
823 {
824 if (ibss_rsn == NULL)
825 return;
826 os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
827 }
828
829
ibss_rsn_handle_auth_1_of_2(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * addr)830 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
831 struct ibss_rsn_peer *peer,
832 const u8* addr)
833 {
834 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
835 MAC2STR(addr));
836
837 if (peer &&
838 peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
839 if (peer->own_auth_tx.sec) {
840 struct os_reltime now, diff;
841 os_get_reltime(&now);
842 os_reltime_sub(&now, &peer->own_auth_tx, &diff);
843 if (diff.sec == 0 && diff.usec < 500000) {
844 wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
845 (int) diff.usec);
846 goto skip_reinit;
847 }
848 }
849 /*
850 * A peer sent us an Authentication frame even though it already
851 * started an EAPOL session. We should reinit state machines
852 * here, but it's much more complicated than just deleting and
853 * recreating the state machine
854 */
855 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
856 MACSTR, MAC2STR(addr));
857
858 ibss_rsn_stop(ibss_rsn, addr);
859 peer = NULL;
860 }
861
862 if (!peer) {
863 peer = ibss_rsn_peer_init(ibss_rsn, addr);
864 if (!peer)
865 return;
866
867 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
868 MAC2STR(addr));
869 }
870
871 skip_reinit:
872 /* reply with an Authentication frame now, before sending an EAPOL */
873 ibss_rsn_send_auth(ibss_rsn, addr, 2);
874 /* no need to start another AUTH challenge in the other way.. */
875 ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
876 }
877
878
ibss_rsn_handle_auth(struct ibss_rsn * ibss_rsn,const u8 * auth_frame,size_t len)879 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
880 size_t len)
881 {
882 const struct ieee80211_mgmt *header;
883 struct ibss_rsn_peer *peer;
884 size_t auth_length;
885
886 header = (const struct ieee80211_mgmt *) auth_frame;
887 auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
888
889 if (ibss_rsn == NULL || len < auth_length)
890 return;
891
892 if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
893 le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
894 return;
895
896 peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
897
898 switch (le_to_host16(header->u.auth.auth_transaction)) {
899 case 1:
900 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
901 break;
902 case 2:
903 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
904 MACSTR, MAC2STR(header->sa));
905 if (!peer) {
906 wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
907 "unknown STA " MACSTR, MAC2STR(header->sa));
908 break;
909 }
910
911 /* authentication has been completed */
912 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
913 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
914 MAC2STR(header->sa));
915 ibss_rsn_peer_authenticated(ibss_rsn, peer,
916 IBSS_RSN_AUTH_BY_US);
917 break;
918 }
919 }
920