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 int encrypt = peer->authentication_status & IBSS_RSN_REPORTED_PTK;
68
69 wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR
70 " proto=0x%04x len=%lu no_encrypt=%d)",
71 __func__, MAC2STR(dest), proto, (unsigned long) len,
72 !encrypt);
73
74 if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_CONTROL_PORT)
75 return wpa_drv_tx_control_port(wpa_s, dest, proto, buf, len,
76 !encrypt);
77
78 if (wpa_s->l2)
79 return l2_packet_send(wpa_s->l2, dest, proto, buf, len);
80
81 return -1;
82 }
83
84
supp_alloc_eapol(void * ctx,u8 type,const void * data,u16 data_len,size_t * msg_len,void ** data_pos)85 static u8 * supp_alloc_eapol(void *ctx, u8 type, const void *data,
86 u16 data_len, size_t *msg_len, void **data_pos)
87 {
88 struct ieee802_1x_hdr *hdr;
89
90 wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)",
91 __func__, type, data_len);
92
93 *msg_len = sizeof(*hdr) + data_len;
94 hdr = os_malloc(*msg_len);
95 if (hdr == NULL)
96 return NULL;
97
98 hdr->version = 2;
99 hdr->type = type;
100 hdr->length = host_to_be16(data_len);
101
102 if (data)
103 os_memcpy(hdr + 1, data, data_len);
104 else
105 os_memset(hdr + 1, 0, data_len);
106
107 if (data_pos)
108 *data_pos = hdr + 1;
109
110 return (u8 *) hdr;
111 }
112
113
supp_get_beacon_ie(void * ctx)114 static int supp_get_beacon_ie(void *ctx)
115 {
116 struct ibss_rsn_peer *peer = ctx;
117
118 wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
119 /* TODO: get correct RSN IE */
120 wpa_sm_set_ap_rsnxe(peer->supp, NULL, 0);
121 return wpa_sm_set_ap_rsn_ie(peer->supp,
122 (u8 *) "\x30\x14\x01\x00"
123 "\x00\x0f\xac\x04"
124 "\x01\x00\x00\x0f\xac\x04"
125 "\x01\x00\x00\x0f\xac\x02"
126 "\x00\x00", 22);
127 }
128
129
ibss_check_rsn_completed(struct ibss_rsn_peer * peer)130 static void ibss_check_rsn_completed(struct ibss_rsn_peer *peer)
131 {
132 struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
133
134 if ((peer->authentication_status &
135 (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH)) !=
136 (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH))
137 return;
138 if (peer->authentication_status & IBSS_RSN_REPORTED_PTK)
139 return;
140 peer->authentication_status |= IBSS_RSN_REPORTED_PTK;
141 wpa_msg(wpa_s, MSG_INFO, IBSS_RSN_COMPLETED MACSTR,
142 MAC2STR(peer->addr));
143 }
144
145
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,enum key_flag key_flag)146 static int supp_set_key(void *ctx, enum wpa_alg alg,
147 const u8 *addr, int key_idx, int set_tx,
148 const u8 *seq, size_t seq_len,
149 const u8 *key, size_t key_len, enum key_flag key_flag)
150 {
151 struct ibss_rsn_peer *peer = ctx;
152
153 wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d "
154 "set_tx=%d)",
155 __func__, alg, MAC2STR(addr), key_idx, set_tx);
156 wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len);
157 wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len);
158
159 if (key_idx == 0) {
160 peer->authentication_status |= IBSS_RSN_SET_PTK_SUPP;
161 ibss_check_rsn_completed(peer);
162 /*
163 * In IBSS RSN, the pairwise key from the 4-way handshake
164 * initiated by the peer with highest MAC address is used.
165 */
166 if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr,
167 ETH_ALEN) > 0) {
168 wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK");
169 return 0;
170 }
171 }
172
173 if (is_broadcast_ether_addr(addr))
174 addr = peer->addr;
175 return wpa_drv_set_key(peer->ibss_rsn->wpa_s, alg, addr, key_idx,
176 set_tx, seq, seq_len, key, key_len, key_flag);
177 }
178
179
supp_get_network_ctx(void * ctx)180 static void * supp_get_network_ctx(void *ctx)
181 {
182 struct ibss_rsn_peer *peer = ctx;
183 return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s);
184 }
185
186
supp_mlme_setprotection(void * ctx,const u8 * addr,int protection_type,int key_type)187 static int supp_mlme_setprotection(void *ctx, const u8 *addr,
188 int protection_type, int key_type)
189 {
190 wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
191 "key_type=%d)",
192 __func__, MAC2STR(addr), protection_type, key_type);
193 return 0;
194 }
195
196
supp_cancel_auth_timeout(void * ctx)197 static void supp_cancel_auth_timeout(void *ctx)
198 {
199 wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
200 }
201
202
supp_deauthenticate(void * ctx,u16 reason_code)203 static void supp_deauthenticate(void *ctx, u16 reason_code)
204 {
205 wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
206 }
207
208
supp_reconnect(void * ctx)209 static void supp_reconnect(void *ctx)
210 {
211 wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
212 }
213
214
ibss_rsn_supp_init(struct ibss_rsn_peer * peer,const u8 * own_addr,const u8 * psk)215 static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
216 const u8 *psk)
217 {
218 struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
219 if (ctx == NULL)
220 return -1;
221
222 ctx->ctx = peer;
223 ctx->msg_ctx = peer->ibss_rsn->wpa_s;
224 ctx->set_state = supp_set_state;
225 ctx->get_state = supp_get_state;
226 ctx->ether_send = supp_ether_send;
227 ctx->get_beacon_ie = supp_get_beacon_ie;
228 ctx->alloc_eapol = supp_alloc_eapol;
229 ctx->set_key = supp_set_key;
230 ctx->get_network_ctx = supp_get_network_ctx;
231 ctx->mlme_setprotection = supp_mlme_setprotection;
232 ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
233 ctx->deauthenticate = supp_deauthenticate;
234 ctx->reconnect = supp_reconnect;
235 peer->supp = wpa_sm_init(ctx);
236 if (peer->supp == NULL) {
237 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
238 os_free(ctx);
239 return -1;
240 }
241
242 wpa_sm_set_own_addr(peer->supp, own_addr);
243 wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
244 wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
245 wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
246 wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
247 wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
248 wpa_sm_set_pmk(peer->supp, psk, PMK_LEN, NULL, NULL);
249
250 peer->supp_ie_len = sizeof(peer->supp_ie);
251 if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
252 &peer->supp_ie_len) < 0) {
253 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
254 " failed");
255 return -1;
256 }
257
258 wpa_sm_notify_assoc(peer->supp, peer->addr);
259
260 return 0;
261 }
262
263
auth_logger(void * ctx,const u8 * addr,logger_level level,const char * txt)264 static void auth_logger(void *ctx, const u8 *addr, logger_level level,
265 const char *txt)
266 {
267 if (addr)
268 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
269 MAC2STR(addr), txt);
270 else
271 wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
272 }
273
274
auth_get_psk(void * ctx,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk,size_t * psk_len,int * vlan_id)275 static const u8 * auth_get_psk(void *ctx, const u8 *addr,
276 const u8 *p2p_dev_addr, const u8 *prev_psk,
277 size_t *psk_len, int *vlan_id)
278 {
279 struct ibss_rsn *ibss_rsn = ctx;
280
281 if (psk_len)
282 *psk_len = PMK_LEN;
283 if (vlan_id)
284 *vlan_id = 0;
285 wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
286 __func__, MAC2STR(addr), prev_psk);
287 if (prev_psk)
288 return NULL;
289 return ibss_rsn->psk;
290 }
291
292
auth_send_eapol(void * ctx,const u8 * addr,const u8 * data,size_t data_len,int encrypt)293 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
294 size_t data_len, int encrypt)
295 {
296 struct ibss_rsn *ibss_rsn = ctx;
297 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
298
299 wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
300 "encrypt=%d)",
301 __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
302
303 if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_CONTROL_PORT)
304 return wpa_drv_tx_control_port(wpa_s, addr, ETH_P_EAPOL,
305 data, data_len, !encrypt);
306
307 if (wpa_s->l2)
308 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
309 data_len);
310
311 return -1;
312 }
313
314
auth_set_key(void * ctx,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len,enum key_flag key_flag)315 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
316 const u8 *addr, int idx, u8 *key, size_t key_len,
317 enum key_flag key_flag)
318 {
319 struct ibss_rsn *ibss_rsn = ctx;
320 u8 seq[6];
321
322 os_memset(seq, 0, sizeof(seq));
323
324 if (addr) {
325 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
326 " key_idx=%d)",
327 __func__, alg, MAC2STR(addr), idx);
328 } else {
329 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
330 __func__, alg, idx);
331 }
332 wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
333
334 if (idx == 0) {
335 if (addr) {
336 struct ibss_rsn_peer *peer;
337 peer = ibss_rsn_get_peer(ibss_rsn, addr);
338 if (peer) {
339 peer->authentication_status |=
340 IBSS_RSN_SET_PTK_AUTH;
341 ibss_check_rsn_completed(peer);
342 }
343 }
344 /*
345 * In IBSS RSN, the pairwise key from the 4-way handshake
346 * initiated by the peer with highest MAC address is used.
347 */
348 if (addr == NULL ||
349 os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
350 wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
351 return 0;
352 }
353 }
354
355 return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
356 1, seq, 6, key, key_len, key_flag);
357 }
358
359
ibss_rsn_disconnect(void * ctx,const u8 * addr,u16 reason)360 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
361 {
362 struct ibss_rsn *ibss_rsn = ctx;
363 wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
364 }
365
366
auth_for_each_sta(void * ctx,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)367 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
368 void *ctx),
369 void *cb_ctx)
370 {
371 struct ibss_rsn *ibss_rsn = ctx;
372 struct ibss_rsn_peer *peer;
373
374 wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
375
376 for (peer = ibss_rsn->peers; peer; peer = peer->next) {
377 if (peer->auth && cb(peer->auth, cb_ctx))
378 return 1;
379 }
380
381 return 0;
382 }
383
384
ibss_set_sta_authorized(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int authorized)385 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
386 struct ibss_rsn_peer *peer, int authorized)
387 {
388 int res;
389
390 if (authorized) {
391 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
392 WPA_STA_AUTHORIZED,
393 WPA_STA_AUTHORIZED, ~0);
394 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
395 MAC2STR(peer->addr));
396 } else {
397 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
398 0, 0, ~WPA_STA_AUTHORIZED);
399 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
400 MAC2STR(peer->addr));
401 }
402
403 if (res && errno != ENOENT) {
404 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
405 "for kernel driver (errno=%d)",
406 MAC2STR(peer->addr), errno);
407 }
408 }
409
410
auth_set_eapol(void * ctx,const u8 * addr,wpa_eapol_variable var,int value)411 static void auth_set_eapol(void *ctx, const u8 *addr,
412 wpa_eapol_variable var, int value)
413 {
414 struct ibss_rsn *ibss_rsn = ctx;
415 struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
416
417 if (peer == NULL)
418 return;
419
420 switch (var) {
421 case WPA_EAPOL_authorized:
422 ibss_set_sta_authorized(ibss_rsn, peer, value);
423 break;
424 default:
425 /* do not handle any other event */
426 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
427 break;
428 }
429 }
430
431
ibss_rsn_auth_init_group(struct ibss_rsn * ibss_rsn,const u8 * own_addr,struct wpa_ssid * ssid)432 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
433 const u8 *own_addr, struct wpa_ssid *ssid)
434 {
435 struct wpa_auth_config conf;
436 static const struct wpa_auth_callbacks cb = {
437 .logger = auth_logger,
438 .set_eapol = auth_set_eapol,
439 .send_eapol = auth_send_eapol,
440 .get_psk = auth_get_psk,
441 .set_key = auth_set_key,
442 .for_each_sta = auth_for_each_sta,
443 .disconnect = ibss_rsn_disconnect,
444 };
445
446 wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
447
448 os_memset(&conf, 0, sizeof(conf));
449 conf.wpa = 2;
450 conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
451 conf.wpa_pairwise = WPA_CIPHER_CCMP;
452 conf.rsn_pairwise = WPA_CIPHER_CCMP;
453 conf.wpa_group = WPA_CIPHER_CCMP;
454 conf.eapol_version = 2;
455 conf.wpa_group_rekey = ssid->group_rekey ? ssid->group_rekey : 600;
456 conf.wpa_group_update_count = 4;
457 conf.wpa_pairwise_update_count = 4;
458
459 ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb, ibss_rsn);
460 if (ibss_rsn->auth_group == NULL) {
461 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
462 return -1;
463 }
464
465 wpa_init_keys(ibss_rsn->auth_group);
466
467 return 0;
468 }
469
470
ibss_rsn_auth_init(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer)471 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
472 struct ibss_rsn_peer *peer)
473 {
474 peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
475 if (peer->auth == NULL) {
476 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
477 return -1;
478 }
479
480 /* TODO: get peer RSN IE with Probe Request */
481 if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth, 0,
482 (u8 *) "\x30\x14\x01\x00"
483 "\x00\x0f\xac\x04"
484 "\x01\x00\x00\x0f\xac\x04"
485 "\x01\x00\x00\x0f\xac\x02"
486 "\x00\x00", 22, NULL, 0, NULL, 0, NULL, 0) !=
487 WPA_IE_OK) {
488 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
489 return -1;
490 }
491
492 if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
493 return -1;
494
495 if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
496 return -1;
497
498 return 0;
499 }
500
501
ibss_rsn_send_auth(struct ibss_rsn * ibss_rsn,const u8 * da,int seq)502 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
503 {
504 struct ieee80211_mgmt auth;
505 const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
506 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
507
508 os_memset(&auth, 0, sizeof(auth));
509
510 auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
511 WLAN_FC_STYPE_AUTH);
512 os_memcpy(auth.da, da, ETH_ALEN);
513 os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
514 os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
515
516 auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
517 auth.u.auth.auth_transaction = host_to_le16(seq);
518 auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
519
520 wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
521 seq, MAC2STR(da));
522
523 return wpa_drv_send_mlme(wpa_s, (u8 *) &auth, auth_length, 0, 0, 0);
524 }
525
526
ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)527 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
528 {
529 return peer->authentication_status &
530 (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
531 }
532
533
534 static struct ibss_rsn_peer *
ibss_rsn_peer_init(struct ibss_rsn * ibss_rsn,const u8 * addr)535 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
536 {
537 struct ibss_rsn_peer *peer;
538 if (ibss_rsn == NULL)
539 return NULL;
540
541 peer = ibss_rsn_get_peer(ibss_rsn, addr);
542 if (peer) {
543 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
544 " already running", MAC2STR(addr));
545 return peer;
546 }
547
548 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
549 MAC2STR(addr));
550
551 peer = os_zalloc(sizeof(*peer));
552 if (peer == NULL) {
553 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
554 return NULL;
555 }
556
557 peer->ibss_rsn = ibss_rsn;
558 os_memcpy(peer->addr, addr, ETH_ALEN);
559 peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
560
561 if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
562 ibss_rsn->psk) < 0) {
563 ibss_rsn_free(peer);
564 return NULL;
565 }
566
567 peer->next = ibss_rsn->peers;
568 ibss_rsn->peers = peer;
569
570 return peer;
571 }
572
573
ibss_rsn_auth_timeout(void * eloop_ctx,void * timeout_ctx)574 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
575 {
576 struct ibss_rsn_peer *peer = eloop_ctx;
577
578 /*
579 * Assume peer does not support Authentication exchange or the frame was
580 * lost somewhere - start EAPOL Authenticator.
581 */
582 wpa_printf(MSG_DEBUG,
583 "RSN: Timeout on waiting Authentication frame response from "
584 MACSTR " - start authenticator", MAC2STR(peer->addr));
585
586 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
587 ibss_rsn_auth_init(peer->ibss_rsn, peer);
588 }
589
590
ibss_rsn_start(struct ibss_rsn * ibss_rsn,const u8 * addr)591 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
592 {
593 struct ibss_rsn_peer *peer;
594 int res;
595
596 if (!ibss_rsn)
597 return -1;
598
599 /* if the peer already exists, exit immediately */
600 peer = ibss_rsn_get_peer(ibss_rsn, addr);
601 if (peer)
602 return 0;
603
604 peer = ibss_rsn_peer_init(ibss_rsn, addr);
605 if (peer == NULL)
606 return -1;
607
608 /* Open Authentication: send first Authentication frame */
609 res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
610 if (res) {
611 /*
612 * The driver may not support Authentication frame exchange in
613 * IBSS. Ignore authentication and go through EAPOL exchange.
614 */
615 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
616 return ibss_rsn_auth_init(ibss_rsn, peer);
617 } else {
618 os_get_reltime(&peer->own_auth_tx);
619 eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
620 }
621
622 return 0;
623 }
624
625
ibss_rsn_peer_authenticated(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int reason)626 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
627 struct ibss_rsn_peer *peer, int reason)
628 {
629 int already_started;
630
631 if (ibss_rsn == NULL || peer == NULL)
632 return -1;
633
634 already_started = ibss_rsn_is_auth_started(peer);
635 peer->authentication_status |= reason;
636
637 if (already_started) {
638 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
639 "started for peer " MACSTR, MAC2STR(peer->addr));
640 return 0;
641 }
642
643 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
644 "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
645
646 return ibss_rsn_auth_init(ibss_rsn, peer);
647 }
648
649
ibss_rsn_stop(struct ibss_rsn * ibss_rsn,const u8 * peermac)650 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
651 {
652 struct ibss_rsn_peer *peer, *prev;
653
654 if (ibss_rsn == NULL)
655 return;
656
657 if (peermac == NULL) {
658 /* remove all peers */
659 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
660 peer = ibss_rsn->peers;
661 while (peer) {
662 prev = peer;
663 peer = peer->next;
664 ibss_rsn_free(prev);
665 ibss_rsn->peers = peer;
666 }
667 } else {
668 /* remove specific peer */
669 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
670 __func__, MAC2STR(peermac));
671
672 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
673 prev = peer, peer = peer->next) {
674 if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
675 if (prev == NULL)
676 ibss_rsn->peers = peer->next;
677 else
678 prev->next = peer->next;
679 ibss_rsn_free(peer);
680 wpa_printf(MSG_DEBUG, "%s: Successfully "
681 "removed a specific peer",
682 __func__);
683 break;
684 }
685 }
686 }
687 }
688
689
ibss_rsn_init(struct wpa_supplicant * wpa_s,struct wpa_ssid * ssid)690 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s,
691 struct wpa_ssid *ssid)
692 {
693 struct ibss_rsn *ibss_rsn;
694
695 ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
696 if (ibss_rsn == NULL)
697 return NULL;
698 ibss_rsn->wpa_s = wpa_s;
699
700 if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr, ssid) < 0) {
701 ibss_rsn_deinit(ibss_rsn);
702 return NULL;
703 }
704
705 return ibss_rsn;
706 }
707
708
ibss_rsn_deinit(struct ibss_rsn * ibss_rsn)709 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
710 {
711 struct ibss_rsn_peer *peer, *prev;
712
713 if (ibss_rsn == NULL)
714 return;
715
716 peer = ibss_rsn->peers;
717 while (peer) {
718 prev = peer;
719 peer = peer->next;
720 ibss_rsn_free(prev);
721 }
722
723 if (ibss_rsn->auth_group)
724 wpa_deinit(ibss_rsn->auth_group);
725 os_free(ibss_rsn);
726
727 }
728
729
ibss_rsn_eapol_dst_supp(const u8 * buf,size_t len)730 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
731 {
732 const struct ieee802_1x_hdr *hdr;
733 const struct wpa_eapol_key *key;
734 u16 key_info;
735 size_t plen;
736
737 /* TODO: Support other EAPOL packets than just EAPOL-Key */
738
739 if (len < sizeof(*hdr) + sizeof(*key))
740 return -1;
741
742 hdr = (const struct ieee802_1x_hdr *) buf;
743 key = (const struct wpa_eapol_key *) (hdr + 1);
744 plen = be_to_host16(hdr->length);
745
746 if (hdr->version < EAPOL_VERSION) {
747 /* TODO: backwards compatibility */
748 }
749 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
750 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
751 "not a Key frame", hdr->type);
752 return -1;
753 }
754 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
755 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
756 "invalid (frame size %lu)",
757 (unsigned long) plen, (unsigned long) len);
758 return -1;
759 }
760
761 if (key->type != EAPOL_KEY_TYPE_RSN) {
762 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
763 "discarded", key->type);
764 return -1;
765 }
766
767 key_info = WPA_GET_BE16(key->key_info);
768
769 return !!(key_info & WPA_KEY_INFO_ACK);
770 }
771
772
ibss_rsn_process_rx_eapol(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * buf,size_t len)773 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
774 struct ibss_rsn_peer *peer,
775 const u8 *buf, size_t len)
776 {
777 int supp;
778 u8 *tmp;
779
780 supp = ibss_rsn_eapol_dst_supp(buf, len);
781 if (supp < 0)
782 return -1;
783
784 tmp = os_memdup(buf, len);
785 if (tmp == NULL)
786 return -1;
787 if (supp) {
788 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
789 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
790 MACSTR, MAC2STR(peer->addr));
791 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
792 } else {
793 if (ibss_rsn_is_auth_started(peer) == 0) {
794 wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
795 "Authenticator dropped as " MACSTR " is not "
796 "authenticated", MAC2STR(peer->addr));
797 os_free(tmp);
798 return -1;
799 }
800
801 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
802 "from "MACSTR, MAC2STR(peer->addr));
803 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
804 }
805 os_free(tmp);
806
807 return 1;
808 }
809
810
ibss_rsn_rx_eapol(struct ibss_rsn * ibss_rsn,const u8 * src_addr,const u8 * buf,size_t len)811 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
812 const u8 *buf, size_t len)
813 {
814 struct ibss_rsn_peer *peer;
815
816 if (ibss_rsn == NULL)
817 return -1;
818
819 peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
820 if (peer)
821 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
822
823 if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
824 /*
825 * Create new IBSS peer based on an EAPOL message from the peer
826 * Authenticator.
827 */
828 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
829 if (peer == NULL)
830 return -1;
831
832 /* assume the peer is authenticated already */
833 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
834 MACSTR, MAC2STR(src_addr));
835 ibss_rsn_peer_authenticated(ibss_rsn, peer,
836 IBSS_RSN_AUTH_EAPOL_BY_US);
837
838 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
839 buf, len);
840 }
841
842 return 0;
843 }
844
ibss_rsn_set_psk(struct ibss_rsn * ibss_rsn,const u8 * psk)845 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
846 {
847 if (ibss_rsn == NULL)
848 return;
849 os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
850 }
851
852
ibss_rsn_handle_auth_1_of_2(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * addr)853 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
854 struct ibss_rsn_peer *peer,
855 const u8* addr)
856 {
857 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
858 MAC2STR(addr));
859
860 if (peer &&
861 peer->authentication_status & (IBSS_RSN_SET_PTK_SUPP |
862 IBSS_RSN_SET_PTK_AUTH)) {
863 /* Clear the TK for this pair to allow recovery from the case
864 * where the peer STA has restarted and lost its key while we
865 * still have a pairwise key configured. */
866 wpa_printf(MSG_DEBUG, "RSN: Clear pairwise key for peer "
867 MACSTR, MAC2STR(addr));
868 wpa_drv_set_key(ibss_rsn->wpa_s, WPA_ALG_NONE, addr, 0, 0,
869 NULL, 0, NULL, 0, KEY_FLAG_PAIRWISE);
870 }
871
872 if (peer &&
873 peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
874 if (peer->own_auth_tx.sec) {
875 struct os_reltime now, diff;
876 os_get_reltime(&now);
877 os_reltime_sub(&now, &peer->own_auth_tx, &diff);
878 if (diff.sec == 0 && diff.usec < 500000) {
879 wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
880 (int) diff.usec);
881 goto skip_reinit;
882 }
883 }
884 /*
885 * A peer sent us an Authentication frame even though it already
886 * started an EAPOL session. We should reinit state machines
887 * here, but it's much more complicated than just deleting and
888 * recreating the state machine
889 */
890 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
891 MACSTR, MAC2STR(addr));
892
893 ibss_rsn_stop(ibss_rsn, addr);
894 peer = NULL;
895 }
896
897 if (!peer) {
898 peer = ibss_rsn_peer_init(ibss_rsn, addr);
899 if (!peer)
900 return;
901
902 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
903 MAC2STR(addr));
904 }
905
906 skip_reinit:
907 /* reply with an Authentication frame now, before sending an EAPOL */
908 ibss_rsn_send_auth(ibss_rsn, addr, 2);
909 /* no need to start another AUTH challenge in the other way.. */
910 ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
911 }
912
913
ibss_rsn_handle_auth(struct ibss_rsn * ibss_rsn,const u8 * auth_frame,size_t len)914 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
915 size_t len)
916 {
917 const struct ieee80211_mgmt *header;
918 struct ibss_rsn_peer *peer;
919 size_t auth_length;
920
921 header = (const struct ieee80211_mgmt *) auth_frame;
922 auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
923
924 if (ibss_rsn == NULL || len < auth_length)
925 return;
926
927 if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
928 le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
929 return;
930
931 peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
932
933 switch (le_to_host16(header->u.auth.auth_transaction)) {
934 case 1:
935 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
936 break;
937 case 2:
938 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
939 MACSTR, MAC2STR(header->sa));
940 if (!peer) {
941 wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
942 "unknown STA " MACSTR, MAC2STR(header->sa));
943 break;
944 }
945
946 /* authentication has been completed */
947 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
948 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
949 MAC2STR(header->sa));
950 ibss_rsn_peer_authenticated(ibss_rsn, peer,
951 IBSS_RSN_AUTH_BY_US);
952 break;
953 }
954 }
955