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 if (key_flag & KEY_FLAG_NEXT) {
154 wpa_printf(MSG_DEBUG,
155 "SUPP: Ignore set_key with KEY_FLAG_NEXT");
156 return 0;
157 }
158
159 wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d "
160 "set_tx=%d)",
161 __func__, alg, MAC2STR(addr), key_idx, set_tx);
162 wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len);
163 wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len);
164
165 if (key_idx == 0) {
166 peer->authentication_status |= IBSS_RSN_SET_PTK_SUPP;
167 ibss_check_rsn_completed(peer);
168 /*
169 * In IBSS RSN, the pairwise key from the 4-way handshake
170 * initiated by the peer with highest MAC address is used.
171 */
172 if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr,
173 ETH_ALEN) > 0) {
174 wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK");
175 return 0;
176 }
177 }
178
179 if (is_broadcast_ether_addr(addr))
180 addr = peer->addr;
181 return wpa_drv_set_key(peer->ibss_rsn->wpa_s, link_id, alg, addr,
182 key_idx, set_tx, seq, seq_len, key, key_len,
183 key_flag);
184 }
185
186
supp_get_network_ctx(void * ctx)187 static void * supp_get_network_ctx(void *ctx)
188 {
189 struct ibss_rsn_peer *peer = ctx;
190 return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s);
191 }
192
193
supp_mlme_setprotection(void * ctx,const u8 * addr,int protection_type,int key_type)194 static int supp_mlme_setprotection(void *ctx, const u8 *addr,
195 int protection_type, int key_type)
196 {
197 wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
198 "key_type=%d)",
199 __func__, MAC2STR(addr), protection_type, key_type);
200 return 0;
201 }
202
203
supp_cancel_auth_timeout(void * ctx)204 static void supp_cancel_auth_timeout(void *ctx)
205 {
206 wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
207 }
208
209
supp_deauthenticate(void * ctx,u16 reason_code)210 static void supp_deauthenticate(void *ctx, u16 reason_code)
211 {
212 wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
213 }
214
215
supp_reconnect(void * ctx)216 static void supp_reconnect(void *ctx)
217 {
218 wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
219 }
220
221
ibss_rsn_supp_init(struct ibss_rsn_peer * peer,const u8 * own_addr,const u8 * psk)222 static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
223 const u8 *psk)
224 {
225 struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
226 if (ctx == NULL)
227 return -1;
228
229 ctx->ctx = peer;
230 ctx->msg_ctx = peer->ibss_rsn->wpa_s;
231 ctx->set_state = supp_set_state;
232 ctx->get_state = supp_get_state;
233 ctx->ether_send = supp_ether_send;
234 ctx->get_beacon_ie = supp_get_beacon_ie;
235 ctx->alloc_eapol = supp_alloc_eapol;
236 ctx->set_key = supp_set_key;
237 ctx->get_network_ctx = supp_get_network_ctx;
238 ctx->mlme_setprotection = supp_mlme_setprotection;
239 ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
240 ctx->deauthenticate = supp_deauthenticate;
241 ctx->reconnect = supp_reconnect;
242 peer->supp = wpa_sm_init(ctx);
243 if (peer->supp == NULL) {
244 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
245 os_free(ctx);
246 return -1;
247 }
248
249 wpa_sm_set_own_addr(peer->supp, own_addr);
250 wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
251 wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
252 wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
253 wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
254 wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
255 wpa_sm_set_pmk(peer->supp, psk, PMK_LEN, NULL, NULL);
256
257 peer->supp_ie_len = sizeof(peer->supp_ie);
258 if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
259 &peer->supp_ie_len) < 0) {
260 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
261 " failed");
262 return -1;
263 }
264
265 wpa_sm_notify_assoc(peer->supp, peer->addr);
266
267 return 0;
268 }
269
270
auth_logger(void * ctx,const u8 * addr,logger_level level,const char * txt)271 static void auth_logger(void *ctx, const u8 *addr, logger_level level,
272 const char *txt)
273 {
274 if (addr)
275 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
276 MAC2STR(addr), txt);
277 else
278 wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
279 }
280
281
auth_get_psk(void * ctx,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk,size_t * psk_len,int * vlan_id)282 static const u8 * auth_get_psk(void *ctx, const u8 *addr,
283 const u8 *p2p_dev_addr, const u8 *prev_psk,
284 size_t *psk_len, int *vlan_id)
285 {
286 struct ibss_rsn *ibss_rsn = ctx;
287
288 if (psk_len)
289 *psk_len = PMK_LEN;
290 if (vlan_id)
291 *vlan_id = 0;
292 wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
293 __func__, MAC2STR(addr), prev_psk);
294 if (prev_psk)
295 return NULL;
296 return ibss_rsn->psk;
297 }
298
299
auth_send_eapol(void * ctx,const u8 * addr,const u8 * data,size_t data_len,int encrypt)300 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
301 size_t data_len, int encrypt)
302 {
303 struct ibss_rsn *ibss_rsn = ctx;
304 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
305
306 wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
307 "encrypt=%d)",
308 __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
309
310 if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_CONTROL_PORT)
311 return wpa_drv_tx_control_port(wpa_s, addr, ETH_P_EAPOL,
312 data, data_len, !encrypt);
313
314 if (wpa_s->l2)
315 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
316 data_len);
317
318 return -1;
319 }
320
321
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)322 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
323 const u8 *addr, int idx, u8 *key, size_t key_len,
324 enum key_flag key_flag)
325 {
326 struct ibss_rsn *ibss_rsn = ctx;
327 u8 seq[6];
328
329 if (key_flag & KEY_FLAG_NEXT) {
330 wpa_printf(MSG_DEBUG,
331 "AUTH: Ignore set_key with KEY_FLAG_NEXT");
332 return 0;
333 }
334
335 os_memset(seq, 0, sizeof(seq));
336
337 if (addr) {
338 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
339 " key_idx=%d)",
340 __func__, alg, MAC2STR(addr), idx);
341 } else {
342 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
343 __func__, alg, idx);
344 }
345 wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
346
347 if (idx == 0) {
348 if (addr) {
349 struct ibss_rsn_peer *peer;
350 peer = ibss_rsn_get_peer(ibss_rsn, addr);
351 if (peer) {
352 peer->authentication_status |=
353 IBSS_RSN_SET_PTK_AUTH;
354 ibss_check_rsn_completed(peer);
355 }
356 }
357 /*
358 * In IBSS RSN, the pairwise key from the 4-way handshake
359 * initiated by the peer with highest MAC address is used.
360 */
361 if (addr == NULL ||
362 os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
363 wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
364 return 0;
365 }
366 }
367
368 return wpa_drv_set_key(ibss_rsn->wpa_s, -1, alg, addr, idx,
369 1, seq, 6, key, key_len, key_flag);
370 }
371
372
ibss_rsn_disconnect(void * ctx,const u8 * addr,u16 reason)373 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
374 {
375 struct ibss_rsn *ibss_rsn = ctx;
376 wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
377 }
378
379
auth_for_each_sta(void * ctx,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)380 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
381 void *ctx),
382 void *cb_ctx)
383 {
384 struct ibss_rsn *ibss_rsn = ctx;
385 struct ibss_rsn_peer *peer;
386
387 wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
388
389 for (peer = ibss_rsn->peers; peer; peer = peer->next) {
390 if (peer->auth && cb(peer->auth, cb_ctx))
391 return 1;
392 }
393
394 return 0;
395 }
396
397
ibss_set_sta_authorized(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int authorized)398 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
399 struct ibss_rsn_peer *peer, int authorized)
400 {
401 int res;
402
403 if (authorized) {
404 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
405 WPA_STA_AUTHORIZED,
406 WPA_STA_AUTHORIZED, ~0);
407 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
408 MAC2STR(peer->addr));
409 } else {
410 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
411 0, 0, ~WPA_STA_AUTHORIZED);
412 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
413 MAC2STR(peer->addr));
414 }
415
416 if (res && errno != ENOENT) {
417 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
418 "for kernel driver (errno=%d)",
419 MAC2STR(peer->addr), errno);
420 }
421 }
422
423
auth_set_eapol(void * ctx,const u8 * addr,wpa_eapol_variable var,int value)424 static void auth_set_eapol(void *ctx, const u8 *addr,
425 wpa_eapol_variable var, int value)
426 {
427 struct ibss_rsn *ibss_rsn = ctx;
428 struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
429
430 if (peer == NULL)
431 return;
432
433 switch (var) {
434 case WPA_EAPOL_authorized:
435 ibss_set_sta_authorized(ibss_rsn, peer, value);
436 break;
437 default:
438 /* do not handle any other event */
439 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
440 break;
441 }
442 }
443
444
ibss_rsn_auth_init_group(struct ibss_rsn * ibss_rsn,const u8 * own_addr,struct wpa_ssid * ssid)445 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
446 const u8 *own_addr, struct wpa_ssid *ssid)
447 {
448 struct wpa_auth_config conf;
449 static const struct wpa_auth_callbacks cb = {
450 .logger = auth_logger,
451 .set_eapol = auth_set_eapol,
452 .send_eapol = auth_send_eapol,
453 .get_psk = auth_get_psk,
454 .set_key = auth_set_key,
455 .for_each_sta = auth_for_each_sta,
456 .disconnect = ibss_rsn_disconnect,
457 };
458
459 wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
460
461 os_memset(&conf, 0, sizeof(conf));
462 conf.wpa = 2;
463 conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
464 conf.wpa_pairwise = WPA_CIPHER_CCMP;
465 conf.rsn_pairwise = WPA_CIPHER_CCMP;
466 conf.wpa_group = WPA_CIPHER_CCMP;
467 conf.eapol_version = 2;
468 conf.wpa_group_rekey = ssid->group_rekey ? ssid->group_rekey : 600;
469 conf.wpa_group_update_count = 4;
470 conf.wpa_pairwise_update_count = 4;
471
472 ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb, ibss_rsn);
473 if (ibss_rsn->auth_group == NULL) {
474 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
475 return -1;
476 }
477
478 wpa_init_keys(ibss_rsn->auth_group);
479
480 return 0;
481 }
482
483
ibss_rsn_auth_init(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer)484 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
485 struct ibss_rsn_peer *peer)
486 {
487 peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
488 if (peer->auth == NULL) {
489 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
490 return -1;
491 }
492
493 /* TODO: get peer RSN IE with Probe Request */
494 if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth, 0,
495 (u8 *) "\x30\x14\x01\x00"
496 "\x00\x0f\xac\x04"
497 "\x01\x00\x00\x0f\xac\x04"
498 "\x01\x00\x00\x0f\xac\x02"
499 "\x00\x00", 22, NULL, 0, NULL, 0, NULL, 0,
500 NULL, false) != WPA_IE_OK) {
501 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
502 return -1;
503 }
504
505 if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
506 return -1;
507
508 if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
509 return -1;
510
511 return 0;
512 }
513
514
ibss_rsn_send_auth(struct ibss_rsn * ibss_rsn,const u8 * da,int seq)515 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
516 {
517 struct ieee80211_mgmt auth;
518 const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
519 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
520
521 os_memset(&auth, 0, sizeof(auth));
522
523 auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
524 WLAN_FC_STYPE_AUTH);
525 os_memcpy(auth.da, da, ETH_ALEN);
526 os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
527 os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
528
529 auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
530 auth.u.auth.auth_transaction = host_to_le16(seq);
531 auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
532
533 wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
534 seq, MAC2STR(da));
535
536 return wpa_drv_send_mlme(wpa_s, (u8 *) &auth, auth_length, 0, 0, 0);
537 }
538
539
ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)540 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
541 {
542 return peer->authentication_status &
543 (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
544 }
545
546
547 static struct ibss_rsn_peer *
ibss_rsn_peer_init(struct ibss_rsn * ibss_rsn,const u8 * addr)548 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
549 {
550 struct ibss_rsn_peer *peer;
551 if (ibss_rsn == NULL)
552 return NULL;
553
554 peer = ibss_rsn_get_peer(ibss_rsn, addr);
555 if (peer) {
556 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
557 " already running", MAC2STR(addr));
558 return peer;
559 }
560
561 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
562 MAC2STR(addr));
563
564 peer = os_zalloc(sizeof(*peer));
565 if (peer == NULL) {
566 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
567 return NULL;
568 }
569
570 peer->ibss_rsn = ibss_rsn;
571 os_memcpy(peer->addr, addr, ETH_ALEN);
572 peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
573
574 if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
575 ibss_rsn->psk) < 0) {
576 ibss_rsn_free(peer);
577 return NULL;
578 }
579
580 peer->next = ibss_rsn->peers;
581 ibss_rsn->peers = peer;
582
583 return peer;
584 }
585
586
ibss_rsn_auth_timeout(void * eloop_ctx,void * timeout_ctx)587 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
588 {
589 struct ibss_rsn_peer *peer = eloop_ctx;
590
591 /*
592 * Assume peer does not support Authentication exchange or the frame was
593 * lost somewhere - start EAPOL Authenticator.
594 */
595 wpa_printf(MSG_DEBUG,
596 "RSN: Timeout on waiting Authentication frame response from "
597 MACSTR " - start authenticator", MAC2STR(peer->addr));
598
599 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
600 ibss_rsn_auth_init(peer->ibss_rsn, peer);
601 }
602
603
ibss_rsn_start(struct ibss_rsn * ibss_rsn,const u8 * addr)604 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
605 {
606 struct ibss_rsn_peer *peer;
607 int res;
608
609 if (!ibss_rsn)
610 return -1;
611
612 /* if the peer already exists, exit immediately */
613 peer = ibss_rsn_get_peer(ibss_rsn, addr);
614 if (peer)
615 return 0;
616
617 peer = ibss_rsn_peer_init(ibss_rsn, addr);
618 if (peer == NULL)
619 return -1;
620
621 /* Open Authentication: send first Authentication frame */
622 res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
623 if (res) {
624 /*
625 * The driver may not support Authentication frame exchange in
626 * IBSS. Ignore authentication and go through EAPOL exchange.
627 */
628 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
629 return ibss_rsn_auth_init(ibss_rsn, peer);
630 } else {
631 os_get_reltime(&peer->own_auth_tx);
632 eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
633 }
634
635 return 0;
636 }
637
638
ibss_rsn_peer_authenticated(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int reason)639 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
640 struct ibss_rsn_peer *peer, int reason)
641 {
642 int already_started;
643
644 if (ibss_rsn == NULL || peer == NULL)
645 return -1;
646
647 already_started = ibss_rsn_is_auth_started(peer);
648 peer->authentication_status |= reason;
649
650 if (already_started) {
651 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
652 "started for peer " MACSTR, MAC2STR(peer->addr));
653 return 0;
654 }
655
656 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
657 "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
658
659 return ibss_rsn_auth_init(ibss_rsn, peer);
660 }
661
662
ibss_rsn_stop(struct ibss_rsn * ibss_rsn,const u8 * peermac)663 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
664 {
665 struct ibss_rsn_peer *peer, *prev;
666
667 if (ibss_rsn == NULL)
668 return;
669
670 if (peermac == NULL) {
671 /* remove all peers */
672 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
673 peer = ibss_rsn->peers;
674 while (peer) {
675 prev = peer;
676 peer = peer->next;
677 ibss_rsn_free(prev);
678 ibss_rsn->peers = peer;
679 }
680 } else {
681 /* remove specific peer */
682 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
683 __func__, MAC2STR(peermac));
684
685 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
686 prev = peer, peer = peer->next) {
687 if (ether_addr_equal(peermac, peer->addr)) {
688 if (prev == NULL)
689 ibss_rsn->peers = peer->next;
690 else
691 prev->next = peer->next;
692 ibss_rsn_free(peer);
693 wpa_printf(MSG_DEBUG, "%s: Successfully "
694 "removed a specific peer",
695 __func__);
696 break;
697 }
698 }
699 }
700 }
701
702
ibss_rsn_init(struct wpa_supplicant * wpa_s,struct wpa_ssid * ssid)703 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s,
704 struct wpa_ssid *ssid)
705 {
706 struct ibss_rsn *ibss_rsn;
707
708 ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
709 if (ibss_rsn == NULL)
710 return NULL;
711 ibss_rsn->wpa_s = wpa_s;
712
713 if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr, ssid) < 0) {
714 ibss_rsn_deinit(ibss_rsn);
715 return NULL;
716 }
717
718 return ibss_rsn;
719 }
720
721
ibss_rsn_deinit(struct ibss_rsn * ibss_rsn)722 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
723 {
724 struct ibss_rsn_peer *peer, *prev;
725
726 if (ibss_rsn == NULL)
727 return;
728
729 peer = ibss_rsn->peers;
730 while (peer) {
731 prev = peer;
732 peer = peer->next;
733 ibss_rsn_free(prev);
734 }
735
736 if (ibss_rsn->auth_group)
737 wpa_deinit(ibss_rsn->auth_group);
738 os_free(ibss_rsn);
739
740 }
741
742
ibss_rsn_eapol_dst_supp(const u8 * buf,size_t len)743 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
744 {
745 const struct ieee802_1x_hdr *hdr;
746 const struct wpa_eapol_key *key;
747 u16 key_info;
748 size_t plen;
749
750 /* TODO: Support other EAPOL packets than just EAPOL-Key */
751
752 if (len < sizeof(*hdr) + sizeof(*key))
753 return -1;
754
755 hdr = (const struct ieee802_1x_hdr *) buf;
756 key = (const struct wpa_eapol_key *) (hdr + 1);
757 plen = be_to_host16(hdr->length);
758
759 if (hdr->version < EAPOL_VERSION) {
760 /* TODO: backwards compatibility */
761 }
762 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
763 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
764 "not a Key frame", hdr->type);
765 return -1;
766 }
767 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
768 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
769 "invalid (frame size %lu)",
770 (unsigned long) plen, (unsigned long) len);
771 return -1;
772 }
773
774 if (key->type != EAPOL_KEY_TYPE_RSN) {
775 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
776 "discarded", key->type);
777 return -1;
778 }
779
780 key_info = WPA_GET_BE16(key->key_info);
781
782 return !!(key_info & WPA_KEY_INFO_ACK);
783 }
784
785
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)786 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
787 struct ibss_rsn_peer *peer,
788 const u8 *buf, size_t len,
789 enum frame_encryption encrypted)
790 {
791 int supp;
792 u8 *tmp;
793
794 supp = ibss_rsn_eapol_dst_supp(buf, len);
795 if (supp < 0)
796 return -1;
797
798 tmp = os_memdup(buf, len);
799 if (tmp == NULL)
800 return -1;
801 if (supp) {
802 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
803 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
804 MACSTR, MAC2STR(peer->addr));
805 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len, encrypted);
806 } else {
807 if (ibss_rsn_is_auth_started(peer) == 0) {
808 wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
809 "Authenticator dropped as " MACSTR " is not "
810 "authenticated", MAC2STR(peer->addr));
811 os_free(tmp);
812 return -1;
813 }
814
815 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
816 "from "MACSTR, MAC2STR(peer->addr));
817 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
818 }
819 os_free(tmp);
820
821 return 1;
822 }
823
824
ibss_rsn_rx_eapol(struct ibss_rsn * ibss_rsn,const u8 * src_addr,const u8 * buf,size_t len,enum frame_encryption encrypted)825 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
826 const u8 *buf, size_t len,
827 enum frame_encryption encrypted)
828 {
829 struct ibss_rsn_peer *peer;
830
831 if (ibss_rsn == NULL)
832 return -1;
833
834 peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
835 if (peer)
836 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len,
837 encrypted);
838
839 if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
840 /*
841 * Create new IBSS peer based on an EAPOL message from the peer
842 * Authenticator.
843 */
844 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
845 if (peer == NULL)
846 return -1;
847
848 /* assume the peer is authenticated already */
849 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
850 MACSTR, MAC2STR(src_addr));
851 ibss_rsn_peer_authenticated(ibss_rsn, peer,
852 IBSS_RSN_AUTH_EAPOL_BY_US);
853
854 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
855 buf, len, encrypted);
856 }
857
858 return 0;
859 }
860
ibss_rsn_set_psk(struct ibss_rsn * ibss_rsn,const u8 * psk)861 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
862 {
863 if (ibss_rsn == NULL)
864 return;
865 os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
866 }
867
868
ibss_rsn_handle_auth_1_of_2(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * addr)869 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
870 struct ibss_rsn_peer *peer,
871 const u8* addr)
872 {
873 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
874 MAC2STR(addr));
875
876 if (peer &&
877 peer->authentication_status & (IBSS_RSN_SET_PTK_SUPP |
878 IBSS_RSN_SET_PTK_AUTH)) {
879 /* Clear the TK for this pair to allow recovery from the case
880 * where the peer STA has restarted and lost its key while we
881 * still have a pairwise key configured. */
882 wpa_printf(MSG_DEBUG, "RSN: Clear pairwise key for peer "
883 MACSTR, MAC2STR(addr));
884 wpa_drv_set_key(ibss_rsn->wpa_s, -1, WPA_ALG_NONE, addr, 0, 0,
885 NULL, 0, NULL, 0, KEY_FLAG_PAIRWISE);
886 }
887
888 if (peer &&
889 peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
890 if (peer->own_auth_tx.sec) {
891 struct os_reltime now, diff;
892 os_get_reltime(&now);
893 os_reltime_sub(&now, &peer->own_auth_tx, &diff);
894 if (diff.sec == 0 && diff.usec < 500000) {
895 wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
896 (int) diff.usec);
897 goto skip_reinit;
898 }
899 }
900 /*
901 * A peer sent us an Authentication frame even though it already
902 * started an EAPOL session. We should reinit state machines
903 * here, but it's much more complicated than just deleting and
904 * recreating the state machine
905 */
906 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
907 MACSTR, MAC2STR(addr));
908
909 ibss_rsn_stop(ibss_rsn, addr);
910 peer = NULL;
911 }
912
913 if (!peer) {
914 peer = ibss_rsn_peer_init(ibss_rsn, addr);
915 if (!peer)
916 return;
917
918 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
919 MAC2STR(addr));
920 }
921
922 skip_reinit:
923 /* reply with an Authentication frame now, before sending an EAPOL */
924 ibss_rsn_send_auth(ibss_rsn, addr, 2);
925 /* no need to start another AUTH challenge in the other way.. */
926 ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
927 }
928
929
ibss_rsn_handle_auth(struct ibss_rsn * ibss_rsn,const u8 * auth_frame,size_t len)930 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
931 size_t len)
932 {
933 const struct ieee80211_mgmt *header;
934 struct ibss_rsn_peer *peer;
935 size_t auth_length;
936
937 header = (const struct ieee80211_mgmt *) auth_frame;
938 auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
939
940 if (ibss_rsn == NULL || len < auth_length)
941 return;
942
943 if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
944 le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
945 return;
946
947 peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
948
949 switch (le_to_host16(header->u.auth.auth_transaction)) {
950 case 1:
951 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
952 break;
953 case 2:
954 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
955 MACSTR, MAC2STR(header->sa));
956 if (!peer) {
957 wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
958 "unknown STA " MACSTR, MAC2STR(header->sa));
959 break;
960 }
961
962 /* authentication has been completed */
963 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
964 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
965 MAC2STR(header->sa));
966 ibss_rsn_peer_authenticated(ibss_rsn, peer,
967 IBSS_RSN_AUTH_BY_US);
968 break;
969 }
970 }
971