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 (ether_addr_equal(addr, peer->addr))
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,int link_id,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, int link_id, 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, link_id, alg, addr,
176 key_idx, set_tx, seq, seq_len, key, key_len,
177 key_flag);
178 }
179
180
supp_get_network_ctx(void * ctx)181 static void * supp_get_network_ctx(void *ctx)
182 {
183 struct ibss_rsn_peer *peer = ctx;
184 return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s);
185 }
186
187
supp_mlme_setprotection(void * ctx,const u8 * addr,int protection_type,int key_type)188 static int supp_mlme_setprotection(void *ctx, const u8 *addr,
189 int protection_type, int key_type)
190 {
191 wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
192 "key_type=%d)",
193 __func__, MAC2STR(addr), protection_type, key_type);
194 return 0;
195 }
196
197
supp_cancel_auth_timeout(void * ctx)198 static void supp_cancel_auth_timeout(void *ctx)
199 {
200 wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
201 }
202
203
supp_deauthenticate(void * ctx,u16 reason_code)204 static void supp_deauthenticate(void *ctx, u16 reason_code)
205 {
206 wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
207 }
208
209
supp_reconnect(void * ctx)210 static void supp_reconnect(void *ctx)
211 {
212 wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
213 }
214
215
ibss_rsn_supp_init(struct ibss_rsn_peer * peer,const u8 * own_addr,const u8 * psk)216 static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
217 const u8 *psk)
218 {
219 struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
220 if (ctx == NULL)
221 return -1;
222
223 ctx->ctx = peer;
224 ctx->msg_ctx = peer->ibss_rsn->wpa_s;
225 ctx->set_state = supp_set_state;
226 ctx->get_state = supp_get_state;
227 ctx->ether_send = supp_ether_send;
228 ctx->get_beacon_ie = supp_get_beacon_ie;
229 ctx->alloc_eapol = supp_alloc_eapol;
230 ctx->set_key = supp_set_key;
231 ctx->get_network_ctx = supp_get_network_ctx;
232 ctx->mlme_setprotection = supp_mlme_setprotection;
233 ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
234 ctx->deauthenticate = supp_deauthenticate;
235 ctx->reconnect = supp_reconnect;
236 peer->supp = wpa_sm_init(ctx);
237 if (peer->supp == NULL) {
238 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
239 os_free(ctx);
240 return -1;
241 }
242
243 wpa_sm_set_own_addr(peer->supp, own_addr);
244 wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
245 wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
246 wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
247 wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
248 wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
249 wpa_sm_set_pmk(peer->supp, psk, PMK_LEN, NULL, NULL);
250
251 peer->supp_ie_len = sizeof(peer->supp_ie);
252 if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
253 &peer->supp_ie_len) < 0) {
254 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
255 " failed");
256 return -1;
257 }
258
259 wpa_sm_notify_assoc(peer->supp, peer->addr);
260
261 return 0;
262 }
263
264
auth_logger(void * ctx,const u8 * addr,logger_level level,const char * txt)265 static void auth_logger(void *ctx, const u8 *addr, logger_level level,
266 const char *txt)
267 {
268 if (addr)
269 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
270 MAC2STR(addr), txt);
271 else
272 wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
273 }
274
275
auth_get_psk(void * ctx,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk,size_t * psk_len,int * vlan_id)276 static const u8 * auth_get_psk(void *ctx, const u8 *addr,
277 const u8 *p2p_dev_addr, const u8 *prev_psk,
278 size_t *psk_len, int *vlan_id)
279 {
280 struct ibss_rsn *ibss_rsn = ctx;
281
282 if (psk_len)
283 *psk_len = PMK_LEN;
284 if (vlan_id)
285 *vlan_id = 0;
286 wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
287 __func__, MAC2STR(addr), prev_psk);
288 if (prev_psk)
289 return NULL;
290 return ibss_rsn->psk;
291 }
292
293
auth_send_eapol(void * ctx,const u8 * addr,const u8 * data,size_t data_len,int encrypt)294 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
295 size_t data_len, int encrypt)
296 {
297 struct ibss_rsn *ibss_rsn = ctx;
298 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
299
300 wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
301 "encrypt=%d)",
302 __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
303
304 if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_CONTROL_PORT)
305 return wpa_drv_tx_control_port(wpa_s, addr, ETH_P_EAPOL,
306 data, data_len, !encrypt);
307
308 if (wpa_s->l2)
309 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
310 data_len);
311
312 return -1;
313 }
314
315
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)316 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
317 const u8 *addr, int idx, u8 *key, size_t key_len,
318 enum key_flag key_flag)
319 {
320 struct ibss_rsn *ibss_rsn = ctx;
321 u8 seq[6];
322
323 os_memset(seq, 0, sizeof(seq));
324
325 if (addr) {
326 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
327 " key_idx=%d)",
328 __func__, alg, MAC2STR(addr), idx);
329 } else {
330 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
331 __func__, alg, idx);
332 }
333 wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
334
335 if (idx == 0) {
336 if (addr) {
337 struct ibss_rsn_peer *peer;
338 peer = ibss_rsn_get_peer(ibss_rsn, addr);
339 if (peer) {
340 peer->authentication_status |=
341 IBSS_RSN_SET_PTK_AUTH;
342 ibss_check_rsn_completed(peer);
343 }
344 }
345 /*
346 * In IBSS RSN, the pairwise key from the 4-way handshake
347 * initiated by the peer with highest MAC address is used.
348 */
349 if (addr == NULL ||
350 os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
351 wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
352 return 0;
353 }
354 }
355
356 return wpa_drv_set_key(ibss_rsn->wpa_s, -1, alg, addr, idx,
357 1, seq, 6, key, key_len, key_flag);
358 }
359
360
ibss_rsn_disconnect(void * ctx,const u8 * addr,u16 reason)361 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
362 {
363 struct ibss_rsn *ibss_rsn = ctx;
364 wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
365 }
366
367
auth_for_each_sta(void * ctx,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)368 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
369 void *ctx),
370 void *cb_ctx)
371 {
372 struct ibss_rsn *ibss_rsn = ctx;
373 struct ibss_rsn_peer *peer;
374
375 wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
376
377 for (peer = ibss_rsn->peers; peer; peer = peer->next) {
378 if (peer->auth && cb(peer->auth, cb_ctx))
379 return 1;
380 }
381
382 return 0;
383 }
384
385
ibss_set_sta_authorized(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int authorized)386 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
387 struct ibss_rsn_peer *peer, int authorized)
388 {
389 int res;
390
391 if (authorized) {
392 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
393 WPA_STA_AUTHORIZED,
394 WPA_STA_AUTHORIZED, ~0);
395 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
396 MAC2STR(peer->addr));
397 } else {
398 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
399 0, 0, ~WPA_STA_AUTHORIZED);
400 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
401 MAC2STR(peer->addr));
402 }
403
404 if (res && errno != ENOENT) {
405 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
406 "for kernel driver (errno=%d)",
407 MAC2STR(peer->addr), errno);
408 }
409 }
410
411
auth_set_eapol(void * ctx,const u8 * addr,wpa_eapol_variable var,int value)412 static void auth_set_eapol(void *ctx, const u8 *addr,
413 wpa_eapol_variable var, int value)
414 {
415 struct ibss_rsn *ibss_rsn = ctx;
416 struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
417
418 if (peer == NULL)
419 return;
420
421 switch (var) {
422 case WPA_EAPOL_authorized:
423 ibss_set_sta_authorized(ibss_rsn, peer, value);
424 break;
425 default:
426 /* do not handle any other event */
427 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
428 break;
429 }
430 }
431
432
ibss_rsn_auth_init_group(struct ibss_rsn * ibss_rsn,const u8 * own_addr,struct wpa_ssid * ssid)433 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
434 const u8 *own_addr, struct wpa_ssid *ssid)
435 {
436 struct wpa_auth_config conf;
437 static const struct wpa_auth_callbacks cb = {
438 .logger = auth_logger,
439 .set_eapol = auth_set_eapol,
440 .send_eapol = auth_send_eapol,
441 .get_psk = auth_get_psk,
442 .set_key = auth_set_key,
443 .for_each_sta = auth_for_each_sta,
444 .disconnect = ibss_rsn_disconnect,
445 };
446
447 wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
448
449 os_memset(&conf, 0, sizeof(conf));
450 conf.wpa = 2;
451 conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
452 conf.wpa_pairwise = WPA_CIPHER_CCMP;
453 conf.rsn_pairwise = WPA_CIPHER_CCMP;
454 conf.wpa_group = WPA_CIPHER_CCMP;
455 conf.eapol_version = 2;
456 conf.wpa_group_rekey = ssid->group_rekey ? ssid->group_rekey : 600;
457 conf.wpa_group_update_count = 4;
458 conf.wpa_pairwise_update_count = 4;
459
460 ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb, ibss_rsn);
461 if (ibss_rsn->auth_group == NULL) {
462 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
463 return -1;
464 }
465
466 wpa_init_keys(ibss_rsn->auth_group);
467
468 return 0;
469 }
470
471
ibss_rsn_auth_init(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer)472 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
473 struct ibss_rsn_peer *peer)
474 {
475 peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
476 if (peer->auth == NULL) {
477 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
478 return -1;
479 }
480
481 /* TODO: get peer RSN IE with Probe Request */
482 if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth, 0,
483 (u8 *) "\x30\x14\x01\x00"
484 "\x00\x0f\xac\x04"
485 "\x01\x00\x00\x0f\xac\x04"
486 "\x01\x00\x00\x0f\xac\x02"
487 "\x00\x00", 22, NULL, 0, NULL, 0, NULL, 0,
488 NULL) != WPA_IE_OK) {
489 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
490 return -1;
491 }
492
493 if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
494 return -1;
495
496 if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
497 return -1;
498
499 return 0;
500 }
501
502
ibss_rsn_send_auth(struct ibss_rsn * ibss_rsn,const u8 * da,int seq)503 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
504 {
505 struct ieee80211_mgmt auth;
506 const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
507 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
508
509 os_memset(&auth, 0, sizeof(auth));
510
511 auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
512 WLAN_FC_STYPE_AUTH);
513 os_memcpy(auth.da, da, ETH_ALEN);
514 os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
515 os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
516
517 auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
518 auth.u.auth.auth_transaction = host_to_le16(seq);
519 auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
520
521 wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
522 seq, MAC2STR(da));
523
524 return wpa_drv_send_mlme(wpa_s, (u8 *) &auth, auth_length, 0, 0, 0);
525 }
526
527
ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)528 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
529 {
530 return peer->authentication_status &
531 (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
532 }
533
534
535 static struct ibss_rsn_peer *
ibss_rsn_peer_init(struct ibss_rsn * ibss_rsn,const u8 * addr)536 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
537 {
538 struct ibss_rsn_peer *peer;
539 if (ibss_rsn == NULL)
540 return NULL;
541
542 peer = ibss_rsn_get_peer(ibss_rsn, addr);
543 if (peer) {
544 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
545 " already running", MAC2STR(addr));
546 return peer;
547 }
548
549 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
550 MAC2STR(addr));
551
552 peer = os_zalloc(sizeof(*peer));
553 if (peer == NULL) {
554 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
555 return NULL;
556 }
557
558 peer->ibss_rsn = ibss_rsn;
559 os_memcpy(peer->addr, addr, ETH_ALEN);
560 peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
561
562 if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
563 ibss_rsn->psk) < 0) {
564 ibss_rsn_free(peer);
565 return NULL;
566 }
567
568 peer->next = ibss_rsn->peers;
569 ibss_rsn->peers = peer;
570
571 return peer;
572 }
573
574
ibss_rsn_auth_timeout(void * eloop_ctx,void * timeout_ctx)575 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
576 {
577 struct ibss_rsn_peer *peer = eloop_ctx;
578
579 /*
580 * Assume peer does not support Authentication exchange or the frame was
581 * lost somewhere - start EAPOL Authenticator.
582 */
583 wpa_printf(MSG_DEBUG,
584 "RSN: Timeout on waiting Authentication frame response from "
585 MACSTR " - start authenticator", MAC2STR(peer->addr));
586
587 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
588 ibss_rsn_auth_init(peer->ibss_rsn, peer);
589 }
590
591
ibss_rsn_start(struct ibss_rsn * ibss_rsn,const u8 * addr)592 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
593 {
594 struct ibss_rsn_peer *peer;
595 int res;
596
597 if (!ibss_rsn)
598 return -1;
599
600 /* if the peer already exists, exit immediately */
601 peer = ibss_rsn_get_peer(ibss_rsn, addr);
602 if (peer)
603 return 0;
604
605 peer = ibss_rsn_peer_init(ibss_rsn, addr);
606 if (peer == NULL)
607 return -1;
608
609 /* Open Authentication: send first Authentication frame */
610 res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
611 if (res) {
612 /*
613 * The driver may not support Authentication frame exchange in
614 * IBSS. Ignore authentication and go through EAPOL exchange.
615 */
616 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
617 return ibss_rsn_auth_init(ibss_rsn, peer);
618 } else {
619 os_get_reltime(&peer->own_auth_tx);
620 eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
621 }
622
623 return 0;
624 }
625
626
ibss_rsn_peer_authenticated(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int reason)627 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
628 struct ibss_rsn_peer *peer, int reason)
629 {
630 int already_started;
631
632 if (ibss_rsn == NULL || peer == NULL)
633 return -1;
634
635 already_started = ibss_rsn_is_auth_started(peer);
636 peer->authentication_status |= reason;
637
638 if (already_started) {
639 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
640 "started for peer " MACSTR, MAC2STR(peer->addr));
641 return 0;
642 }
643
644 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
645 "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
646
647 return ibss_rsn_auth_init(ibss_rsn, peer);
648 }
649
650
ibss_rsn_stop(struct ibss_rsn * ibss_rsn,const u8 * peermac)651 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
652 {
653 struct ibss_rsn_peer *peer, *prev;
654
655 if (ibss_rsn == NULL)
656 return;
657
658 if (peermac == NULL) {
659 /* remove all peers */
660 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
661 peer = ibss_rsn->peers;
662 while (peer) {
663 prev = peer;
664 peer = peer->next;
665 ibss_rsn_free(prev);
666 ibss_rsn->peers = peer;
667 }
668 } else {
669 /* remove specific peer */
670 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
671 __func__, MAC2STR(peermac));
672
673 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
674 prev = peer, peer = peer->next) {
675 if (ether_addr_equal(peermac, peer->addr)) {
676 if (prev == NULL)
677 ibss_rsn->peers = peer->next;
678 else
679 prev->next = peer->next;
680 ibss_rsn_free(peer);
681 wpa_printf(MSG_DEBUG, "%s: Successfully "
682 "removed a specific peer",
683 __func__);
684 break;
685 }
686 }
687 }
688 }
689
690
ibss_rsn_init(struct wpa_supplicant * wpa_s,struct wpa_ssid * ssid)691 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s,
692 struct wpa_ssid *ssid)
693 {
694 struct ibss_rsn *ibss_rsn;
695
696 ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
697 if (ibss_rsn == NULL)
698 return NULL;
699 ibss_rsn->wpa_s = wpa_s;
700
701 if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr, ssid) < 0) {
702 ibss_rsn_deinit(ibss_rsn);
703 return NULL;
704 }
705
706 return ibss_rsn;
707 }
708
709
ibss_rsn_deinit(struct ibss_rsn * ibss_rsn)710 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
711 {
712 struct ibss_rsn_peer *peer, *prev;
713
714 if (ibss_rsn == NULL)
715 return;
716
717 peer = ibss_rsn->peers;
718 while (peer) {
719 prev = peer;
720 peer = peer->next;
721 ibss_rsn_free(prev);
722 }
723
724 if (ibss_rsn->auth_group)
725 wpa_deinit(ibss_rsn->auth_group);
726 os_free(ibss_rsn);
727
728 }
729
730
ibss_rsn_eapol_dst_supp(const u8 * buf,size_t len)731 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
732 {
733 const struct ieee802_1x_hdr *hdr;
734 const struct wpa_eapol_key *key;
735 u16 key_info;
736 size_t plen;
737
738 /* TODO: Support other EAPOL packets than just EAPOL-Key */
739
740 if (len < sizeof(*hdr) + sizeof(*key))
741 return -1;
742
743 hdr = (const struct ieee802_1x_hdr *) buf;
744 key = (const struct wpa_eapol_key *) (hdr + 1);
745 plen = be_to_host16(hdr->length);
746
747 if (hdr->version < EAPOL_VERSION) {
748 /* TODO: backwards compatibility */
749 }
750 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
751 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
752 "not a Key frame", hdr->type);
753 return -1;
754 }
755 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
756 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
757 "invalid (frame size %lu)",
758 (unsigned long) plen, (unsigned long) len);
759 return -1;
760 }
761
762 if (key->type != EAPOL_KEY_TYPE_RSN) {
763 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
764 "discarded", key->type);
765 return -1;
766 }
767
768 key_info = WPA_GET_BE16(key->key_info);
769
770 return !!(key_info & WPA_KEY_INFO_ACK);
771 }
772
773
ibss_rsn_process_rx_eapol(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * buf,size_t len,enum frame_encryption encrypted)774 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
775 struct ibss_rsn_peer *peer,
776 const u8 *buf, size_t len,
777 enum frame_encryption encrypted)
778 {
779 int supp;
780 u8 *tmp;
781
782 supp = ibss_rsn_eapol_dst_supp(buf, len);
783 if (supp < 0)
784 return -1;
785
786 tmp = os_memdup(buf, len);
787 if (tmp == NULL)
788 return -1;
789 if (supp) {
790 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
791 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
792 MACSTR, MAC2STR(peer->addr));
793 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len, encrypted);
794 } else {
795 if (ibss_rsn_is_auth_started(peer) == 0) {
796 wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
797 "Authenticator dropped as " MACSTR " is not "
798 "authenticated", MAC2STR(peer->addr));
799 os_free(tmp);
800 return -1;
801 }
802
803 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
804 "from "MACSTR, MAC2STR(peer->addr));
805 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
806 }
807 os_free(tmp);
808
809 return 1;
810 }
811
812
ibss_rsn_rx_eapol(struct ibss_rsn * ibss_rsn,const u8 * src_addr,const u8 * buf,size_t len,enum frame_encryption encrypted)813 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
814 const u8 *buf, size_t len,
815 enum frame_encryption encrypted)
816 {
817 struct ibss_rsn_peer *peer;
818
819 if (ibss_rsn == NULL)
820 return -1;
821
822 peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
823 if (peer)
824 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len,
825 encrypted);
826
827 if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
828 /*
829 * Create new IBSS peer based on an EAPOL message from the peer
830 * Authenticator.
831 */
832 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
833 if (peer == NULL)
834 return -1;
835
836 /* assume the peer is authenticated already */
837 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
838 MACSTR, MAC2STR(src_addr));
839 ibss_rsn_peer_authenticated(ibss_rsn, peer,
840 IBSS_RSN_AUTH_EAPOL_BY_US);
841
842 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
843 buf, len, encrypted);
844 }
845
846 return 0;
847 }
848
ibss_rsn_set_psk(struct ibss_rsn * ibss_rsn,const u8 * psk)849 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
850 {
851 if (ibss_rsn == NULL)
852 return;
853 os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
854 }
855
856
ibss_rsn_handle_auth_1_of_2(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * addr)857 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
858 struct ibss_rsn_peer *peer,
859 const u8* addr)
860 {
861 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
862 MAC2STR(addr));
863
864 if (peer &&
865 peer->authentication_status & (IBSS_RSN_SET_PTK_SUPP |
866 IBSS_RSN_SET_PTK_AUTH)) {
867 /* Clear the TK for this pair to allow recovery from the case
868 * where the peer STA has restarted and lost its key while we
869 * still have a pairwise key configured. */
870 wpa_printf(MSG_DEBUG, "RSN: Clear pairwise key for peer "
871 MACSTR, MAC2STR(addr));
872 wpa_drv_set_key(ibss_rsn->wpa_s, -1, WPA_ALG_NONE, addr, 0, 0,
873 NULL, 0, NULL, 0, KEY_FLAG_PAIRWISE);
874 }
875
876 if (peer &&
877 peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
878 if (peer->own_auth_tx.sec) {
879 struct os_reltime now, diff;
880 os_get_reltime(&now);
881 os_reltime_sub(&now, &peer->own_auth_tx, &diff);
882 if (diff.sec == 0 && diff.usec < 500000) {
883 wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
884 (int) diff.usec);
885 goto skip_reinit;
886 }
887 }
888 /*
889 * A peer sent us an Authentication frame even though it already
890 * started an EAPOL session. We should reinit state machines
891 * here, but it's much more complicated than just deleting and
892 * recreating the state machine
893 */
894 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
895 MACSTR, MAC2STR(addr));
896
897 ibss_rsn_stop(ibss_rsn, addr);
898 peer = NULL;
899 }
900
901 if (!peer) {
902 peer = ibss_rsn_peer_init(ibss_rsn, addr);
903 if (!peer)
904 return;
905
906 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
907 MAC2STR(addr));
908 }
909
910 skip_reinit:
911 /* reply with an Authentication frame now, before sending an EAPOL */
912 ibss_rsn_send_auth(ibss_rsn, addr, 2);
913 /* no need to start another AUTH challenge in the other way.. */
914 ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
915 }
916
917
ibss_rsn_handle_auth(struct ibss_rsn * ibss_rsn,const u8 * auth_frame,size_t len)918 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
919 size_t len)
920 {
921 const struct ieee80211_mgmt *header;
922 struct ibss_rsn_peer *peer;
923 size_t auth_length;
924
925 header = (const struct ieee80211_mgmt *) auth_frame;
926 auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
927
928 if (ibss_rsn == NULL || len < auth_length)
929 return;
930
931 if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
932 le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
933 return;
934
935 peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
936
937 switch (le_to_host16(header->u.auth.auth_transaction)) {
938 case 1:
939 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
940 break;
941 case 2:
942 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
943 MACSTR, MAC2STR(header->sa));
944 if (!peer) {
945 wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
946 "unknown STA " MACSTR, MAC2STR(header->sa));
947 break;
948 }
949
950 /* authentication has been completed */
951 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
952 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
953 MAC2STR(header->sa));
954 ibss_rsn_peer_authenticated(ibss_rsn, peer,
955 IBSS_RSN_AUTH_BY_US);
956 break;
957 }
958 }
959