Line data Source code
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 :
27 255 : 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 :
32 300 : for (peer = ibss_rsn->peers; peer; peer = peer->next)
33 278 : if (os_memcmp(addr, peer->addr, ETH_ALEN) == 0)
34 233 : break;
35 255 : return peer;
36 : }
37 :
38 :
39 12 : static void ibss_rsn_free(struct ibss_rsn_peer *peer)
40 : {
41 12 : eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
42 12 : wpa_auth_sta_deinit(peer->auth);
43 12 : wpa_sm_deinit(peer->supp);
44 12 : os_free(peer);
45 12 : }
46 :
47 :
48 44 : static void supp_set_state(void *ctx, enum wpa_states state)
49 : {
50 44 : struct ibss_rsn_peer *peer = ctx;
51 44 : peer->supp_state = state;
52 44 : }
53 :
54 :
55 0 : static enum wpa_states supp_get_state(void *ctx)
56 : {
57 0 : struct ibss_rsn_peer *peer = ctx;
58 0 : return peer->supp_state;
59 : }
60 :
61 :
62 24 : static int supp_ether_send(void *ctx, const u8 *dest, u16 proto, const u8 *buf,
63 : size_t len)
64 : {
65 24 : struct ibss_rsn_peer *peer = ctx;
66 24 : struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
67 :
68 168 : wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR " proto=0x%04x "
69 : "len=%lu)",
70 144 : __func__, MAC2STR(dest), proto, (unsigned long) len);
71 :
72 24 : if (wpa_s->l2)
73 24 : return l2_packet_send(wpa_s->l2, dest, proto, buf, len);
74 :
75 0 : return -1;
76 : }
77 :
78 :
79 24 : 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 24 : wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)",
85 : __func__, type, data_len);
86 :
87 24 : *msg_len = sizeof(*hdr) + data_len;
88 24 : hdr = os_malloc(*msg_len);
89 24 : if (hdr == NULL)
90 0 : return NULL;
91 :
92 24 : hdr->version = 2;
93 24 : hdr->type = type;
94 24 : hdr->length = host_to_be16(data_len);
95 :
96 24 : if (data)
97 0 : os_memcpy(hdr + 1, data, data_len);
98 : else
99 24 : os_memset(hdr + 1, 0, data_len);
100 :
101 24 : if (data_pos)
102 24 : *data_pos = hdr + 1;
103 :
104 24 : return (u8 *) hdr;
105 : }
106 :
107 :
108 10 : static int supp_get_beacon_ie(void *ctx)
109 : {
110 10 : struct ibss_rsn_peer *peer = ctx;
111 :
112 10 : wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
113 : /* TODO: get correct RSN IE */
114 10 : 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 :
123 46 : static void ibss_check_rsn_completed(struct ibss_rsn_peer *peer)
124 : {
125 46 : struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
126 :
127 46 : 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 26 : return;
131 20 : if (peer->authentication_status & IBSS_RSN_REPORTED_PTK)
132 10 : return;
133 10 : peer->authentication_status |= IBSS_RSN_REPORTED_PTK;
134 60 : wpa_msg(wpa_s, MSG_INFO, IBSS_RSN_COMPLETED MACSTR,
135 60 : MAC2STR(peer->addr));
136 : }
137 :
138 :
139 20 : 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 20 : struct ibss_rsn_peer *peer = ctx;
145 :
146 120 : wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d "
147 : "set_tx=%d)",
148 120 : __func__, alg, MAC2STR(addr), key_idx, set_tx);
149 20 : wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len);
150 20 : wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len);
151 :
152 20 : if (key_idx == 0) {
153 10 : peer->authentication_status |= IBSS_RSN_SET_PTK_SUPP;
154 10 : 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 10 : if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr,
160 : ETH_ALEN) > 0) {
161 5 : wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK");
162 5 : return 0;
163 : }
164 : }
165 :
166 15 : if (is_broadcast_ether_addr(addr))
167 10 : addr = peer->addr;
168 15 : 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 :
173 14 : static void * supp_get_network_ctx(void *ctx)
174 : {
175 14 : struct ibss_rsn_peer *peer = ctx;
176 14 : return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s);
177 : }
178 :
179 :
180 20 : static int supp_mlme_setprotection(void *ctx, const u8 *addr,
181 : int protection_type, int key_type)
182 : {
183 120 : wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
184 : "key_type=%d)",
185 120 : __func__, MAC2STR(addr), protection_type, key_type);
186 20 : return 0;
187 : }
188 :
189 :
190 10 : static void supp_cancel_auth_timeout(void *ctx)
191 : {
192 10 : wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
193 10 : }
194 :
195 :
196 0 : static void supp_deauthenticate(void * ctx, int reason_code)
197 : {
198 0 : wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
199 0 : }
200 :
201 :
202 12 : static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
203 : const u8 *psk)
204 : {
205 12 : struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
206 12 : if (ctx == NULL)
207 0 : return -1;
208 :
209 12 : ctx->ctx = peer;
210 12 : ctx->msg_ctx = peer->ibss_rsn->wpa_s;
211 12 : ctx->set_state = supp_set_state;
212 12 : ctx->get_state = supp_get_state;
213 12 : ctx->ether_send = supp_ether_send;
214 12 : ctx->get_beacon_ie = supp_get_beacon_ie;
215 12 : ctx->alloc_eapol = supp_alloc_eapol;
216 12 : ctx->set_key = supp_set_key;
217 12 : ctx->get_network_ctx = supp_get_network_ctx;
218 12 : ctx->mlme_setprotection = supp_mlme_setprotection;
219 12 : ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
220 12 : ctx->deauthenticate = supp_deauthenticate;
221 12 : peer->supp = wpa_sm_init(ctx);
222 12 : if (peer->supp == NULL) {
223 0 : wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
224 0 : return -1;
225 : }
226 :
227 12 : wpa_sm_set_own_addr(peer->supp, own_addr);
228 12 : wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
229 12 : wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
230 12 : wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
231 12 : wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
232 12 : wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
233 12 : wpa_sm_set_pmk(peer->supp, psk, PMK_LEN, NULL);
234 :
235 12 : peer->supp_ie_len = sizeof(peer->supp_ie);
236 12 : if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
237 : &peer->supp_ie_len) < 0) {
238 0 : wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
239 : " failed");
240 0 : return -1;
241 : }
242 :
243 12 : wpa_sm_notify_assoc(peer->supp, peer->addr);
244 :
245 12 : return 0;
246 : }
247 :
248 :
249 92 : static void auth_logger(void *ctx, const u8 *addr, logger_level level,
250 : const char *txt)
251 : {
252 92 : if (addr)
253 552 : wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
254 552 : MAC2STR(addr), txt);
255 : else
256 0 : wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
257 92 : }
258 :
259 :
260 34 : static const u8 * auth_get_psk(void *ctx, const u8 *addr,
261 : const u8 *p2p_dev_addr, const u8 *prev_psk)
262 : {
263 34 : struct ibss_rsn *ibss_rsn = ctx;
264 204 : wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
265 204 : __func__, MAC2STR(addr), prev_psk);
266 34 : if (prev_psk)
267 0 : return NULL;
268 34 : return ibss_rsn->psk;
269 : }
270 :
271 :
272 28 : static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
273 : size_t data_len, int encrypt)
274 : {
275 28 : struct ibss_rsn *ibss_rsn = ctx;
276 28 : struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
277 :
278 168 : wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
279 : "encrypt=%d)",
280 168 : __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
281 :
282 28 : if (wpa_s->l2)
283 28 : return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
284 : data_len);
285 :
286 0 : return -1;
287 : }
288 :
289 :
290 44 : 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 44 : struct ibss_rsn *ibss_rsn = ctx;
294 : u8 seq[6];
295 :
296 44 : os_memset(seq, 0, sizeof(seq));
297 :
298 44 : if (addr) {
299 264 : wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
300 : " key_idx=%d)",
301 264 : __func__, alg, MAC2STR(addr), idx);
302 : } else {
303 0 : wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
304 : __func__, alg, idx);
305 : }
306 44 : wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
307 :
308 44 : if (idx == 0) {
309 36 : if (addr) {
310 : struct ibss_rsn_peer *peer;
311 36 : peer = ibss_rsn_get_peer(ibss_rsn, addr);
312 36 : if (peer) {
313 36 : peer->authentication_status |=
314 : IBSS_RSN_SET_PTK_AUTH;
315 36 : 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 72 : if (addr == NULL ||
323 36 : os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
324 18 : wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
325 18 : return 0;
326 : }
327 : }
328 :
329 26 : return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
330 : 1, seq, 6, key, key_len);
331 : }
332 :
333 :
334 2 : static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
335 : {
336 2 : struct ibss_rsn *ibss_rsn = ctx;
337 2 : wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
338 2 : }
339 :
340 :
341 0 : static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
342 : void *ctx),
343 : void *cb_ctx)
344 : {
345 0 : struct ibss_rsn *ibss_rsn = ctx;
346 : struct ibss_rsn_peer *peer;
347 :
348 0 : wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
349 :
350 0 : for (peer = ibss_rsn->peers; peer; peer = peer->next) {
351 0 : if (peer->auth && cb(peer->auth, cb_ctx))
352 0 : return 1;
353 : }
354 :
355 0 : return 0;
356 : }
357 :
358 :
359 24 : 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 24 : if (authorized) {
365 10 : res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
366 : WPA_STA_AUTHORIZED,
367 : WPA_STA_AUTHORIZED, ~0);
368 60 : wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
369 60 : MAC2STR(peer->addr));
370 : } else {
371 14 : res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
372 : 0, 0, ~WPA_STA_AUTHORIZED);
373 84 : wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
374 84 : MAC2STR(peer->addr));
375 : }
376 :
377 24 : if (res && errno != ENOENT) {
378 0 : wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
379 : "for kernel driver (errno=%d)",
380 0 : MAC2STR(peer->addr), errno);
381 : }
382 24 : }
383 :
384 :
385 134 : static void auth_set_eapol(void *ctx, const u8 *addr,
386 : wpa_eapol_variable var, int value)
387 : {
388 134 : struct ibss_rsn *ibss_rsn = ctx;
389 134 : struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
390 :
391 134 : if (peer == NULL)
392 134 : return;
393 :
394 134 : switch (var) {
395 : case WPA_EAPOL_authorized:
396 24 : ibss_set_sta_authorized(ibss_rsn, peer, value);
397 24 : break;
398 : default:
399 : /* do not handle any other event */
400 110 : wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
401 110 : break;
402 : }
403 : }
404 :
405 :
406 4 : 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 4 : wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
413 :
414 4 : os_memset(&conf, 0, sizeof(conf));
415 4 : conf.wpa = 2;
416 4 : conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
417 4 : conf.wpa_pairwise = WPA_CIPHER_CCMP;
418 4 : conf.rsn_pairwise = WPA_CIPHER_CCMP;
419 4 : conf.wpa_group = WPA_CIPHER_CCMP;
420 4 : conf.eapol_version = 2;
421 4 : conf.wpa_group_rekey = 600;
422 :
423 4 : os_memset(&cb, 0, sizeof(cb));
424 4 : cb.ctx = ibss_rsn;
425 4 : cb.logger = auth_logger;
426 4 : cb.set_eapol = auth_set_eapol;
427 4 : cb.send_eapol = auth_send_eapol;
428 4 : cb.get_psk = auth_get_psk;
429 4 : cb.set_key = auth_set_key;
430 4 : cb.for_each_sta = auth_for_each_sta;
431 4 : cb.disconnect = ibss_rsn_disconnect;
432 :
433 4 : ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb);
434 4 : if (ibss_rsn->auth_group == NULL) {
435 0 : wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
436 0 : return -1;
437 : }
438 :
439 4 : wpa_init_keys(ibss_rsn->auth_group);
440 :
441 4 : return 0;
442 : }
443 :
444 :
445 12 : static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
446 : struct ibss_rsn_peer *peer)
447 : {
448 12 : peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
449 12 : if (peer->auth == NULL) {
450 0 : wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
451 0 : return -1;
452 : }
453 :
454 : /* TODO: get peer RSN IE with Probe Request */
455 12 : 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 0 : wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
463 0 : return -1;
464 : }
465 :
466 12 : if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
467 0 : return -1;
468 :
469 12 : if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
470 0 : return -1;
471 :
472 12 : return 0;
473 : }
474 :
475 :
476 18 : static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
477 : {
478 : struct ieee80211_mgmt auth;
479 18 : const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
480 18 : struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
481 :
482 18 : if (wpa_s->driver->send_frame == NULL)
483 0 : return -1;
484 :
485 18 : os_memset(&auth, 0, sizeof(auth));
486 :
487 18 : auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
488 : WLAN_FC_STYPE_AUTH);
489 18 : os_memcpy(auth.da, da, ETH_ALEN);
490 18 : os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
491 18 : os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
492 :
493 18 : auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
494 18 : auth.u.auth.auth_transaction = host_to_le16(seq);
495 18 : auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
496 :
497 108 : wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
498 108 : seq, MAC2STR(da));
499 :
500 18 : return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth,
501 : auth_length, 0);
502 : }
503 :
504 :
505 38 : static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
506 : {
507 38 : 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 *
513 12 : ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
514 : {
515 : struct ibss_rsn_peer *peer;
516 12 : if (ibss_rsn == NULL)
517 0 : return NULL;
518 :
519 12 : peer = ibss_rsn_get_peer(ibss_rsn, addr);
520 12 : if (peer) {
521 0 : wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
522 0 : " already running", MAC2STR(addr));
523 0 : return peer;
524 : }
525 :
526 72 : wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
527 72 : MAC2STR(addr));
528 :
529 12 : peer = os_zalloc(sizeof(*peer));
530 12 : if (peer == NULL) {
531 0 : wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
532 0 : return NULL;
533 : }
534 :
535 12 : peer->ibss_rsn = ibss_rsn;
536 12 : os_memcpy(peer->addr, addr, ETH_ALEN);
537 12 : peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
538 :
539 12 : if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
540 12 : ibss_rsn->psk) < 0) {
541 0 : ibss_rsn_free(peer);
542 0 : return NULL;
543 : }
544 :
545 12 : peer->next = ibss_rsn->peers;
546 12 : ibss_rsn->peers = peer;
547 :
548 12 : return peer;
549 : }
550 :
551 :
552 0 : static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
553 : {
554 0 : 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 0 : wpa_printf(MSG_DEBUG,
561 : "RSN: Timeout on waiting Authentication frame response from "
562 0 : MACSTR " - start authenticator", MAC2STR(peer->addr));
563 :
564 0 : peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
565 0 : ibss_rsn_auth_init(peer->ibss_rsn, peer);
566 0 : }
567 :
568 :
569 11 : 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 the peer already exists, exit immediately */
575 11 : peer = ibss_rsn_get_peer(ibss_rsn, addr);
576 11 : if (peer)
577 2 : return 0;
578 :
579 9 : peer = ibss_rsn_peer_init(ibss_rsn, addr);
580 9 : if (peer == NULL)
581 0 : return -1;
582 :
583 : /* Open Authentication: send first Authentication frame */
584 9 : res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
585 9 : if (res) {
586 : /*
587 : * The driver may not support Authentication frame exchange in
588 : * IBSS. Ignore authentication and go through EAPOL exchange.
589 : */
590 0 : peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
591 0 : return ibss_rsn_auth_init(ibss_rsn, peer);
592 : } else {
593 9 : os_get_reltime(&peer->own_auth_tx);
594 9 : eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
595 : }
596 :
597 9 : return 0;
598 : }
599 :
600 :
601 18 : static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
602 : struct ibss_rsn_peer *peer, int reason)
603 : {
604 : int already_started;
605 :
606 18 : if (ibss_rsn == NULL || peer == NULL)
607 0 : return -1;
608 :
609 18 : already_started = ibss_rsn_is_auth_started(peer);
610 18 : peer->authentication_status |= reason;
611 :
612 18 : if (already_started) {
613 36 : wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
614 36 : "started for peer " MACSTR, MAC2STR(peer->addr));
615 6 : return 0;
616 : }
617 :
618 72 : wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
619 72 : "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
620 :
621 12 : return ibss_rsn_auth_init(ibss_rsn, peer);
622 : }
623 :
624 :
625 4 : void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
626 : {
627 : struct ibss_rsn_peer *peer, *prev;
628 :
629 4 : if (ibss_rsn == NULL)
630 4 : return;
631 :
632 4 : if (peermac == NULL) {
633 : /* remove all peers */
634 0 : wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
635 0 : peer = ibss_rsn->peers;
636 0 : while (peer) {
637 0 : prev = peer;
638 0 : peer = peer->next;
639 0 : ibss_rsn_free(prev);
640 0 : ibss_rsn->peers = peer;
641 : }
642 : } else {
643 : /* remove specific peer */
644 24 : wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
645 24 : __func__, MAC2STR(peermac));
646 :
647 10 : for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
648 2 : prev = peer, peer = peer->next) {
649 6 : if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
650 4 : if (prev == NULL)
651 2 : ibss_rsn->peers = peer->next;
652 : else
653 2 : prev->next = peer->next;
654 4 : ibss_rsn_free(peer);
655 4 : wpa_printf(MSG_DEBUG, "%s: Successfully "
656 : "removed a specific peer",
657 : __func__);
658 4 : break;
659 : }
660 : }
661 : }
662 : }
663 :
664 :
665 4 : struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s)
666 : {
667 : struct ibss_rsn *ibss_rsn;
668 :
669 4 : ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
670 4 : if (ibss_rsn == NULL)
671 0 : return NULL;
672 4 : ibss_rsn->wpa_s = wpa_s;
673 :
674 4 : if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr) < 0) {
675 0 : ibss_rsn_deinit(ibss_rsn);
676 0 : return NULL;
677 : }
678 :
679 4 : return ibss_rsn;
680 : }
681 :
682 :
683 7648 : void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
684 : {
685 : struct ibss_rsn_peer *peer, *prev;
686 :
687 7648 : if (ibss_rsn == NULL)
688 15292 : return;
689 :
690 4 : peer = ibss_rsn->peers;
691 16 : while (peer) {
692 8 : prev = peer;
693 8 : peer = peer->next;
694 8 : ibss_rsn_free(prev);
695 : }
696 :
697 4 : wpa_deinit(ibss_rsn->auth_group);
698 4 : os_free(ibss_rsn);
699 :
700 : }
701 :
702 :
703 44 : static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
704 : {
705 : const struct ieee802_1x_hdr *hdr;
706 : const struct wpa_eapol_key *key;
707 : u16 key_info;
708 : size_t plen;
709 :
710 : /* TODO: Support other EAPOL packets than just EAPOL-Key */
711 :
712 44 : if (len < sizeof(*hdr) + sizeof(*key))
713 0 : return -1;
714 :
715 44 : hdr = (const struct ieee802_1x_hdr *) buf;
716 44 : key = (const struct wpa_eapol_key *) (hdr + 1);
717 44 : plen = be_to_host16(hdr->length);
718 :
719 44 : if (hdr->version < EAPOL_VERSION) {
720 : /* TODO: backwards compatibility */
721 : }
722 44 : if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
723 0 : wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
724 0 : "not a Key frame", hdr->type);
725 0 : return -1;
726 : }
727 44 : if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
728 0 : wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
729 : "invalid (frame size %lu)",
730 : (unsigned long) plen, (unsigned long) len);
731 0 : return -1;
732 : }
733 :
734 44 : if (key->type != EAPOL_KEY_TYPE_RSN) {
735 0 : wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
736 0 : "discarded", key->type);
737 0 : return -1;
738 : }
739 :
740 44 : key_info = WPA_GET_BE16(key->key_info);
741 :
742 44 : return !!(key_info & WPA_KEY_INFO_ACK);
743 : }
744 :
745 :
746 44 : static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
747 : struct ibss_rsn_peer *peer,
748 : const u8 *buf, size_t len)
749 : {
750 : int supp;
751 : u8 *tmp;
752 :
753 44 : supp = ibss_rsn_eapol_dst_supp(buf, len);
754 44 : if (supp < 0)
755 0 : return -1;
756 :
757 44 : tmp = os_malloc(len);
758 44 : if (tmp == NULL)
759 0 : return -1;
760 44 : os_memcpy(tmp, buf, len);
761 44 : if (supp) {
762 24 : peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
763 144 : wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
764 144 : MACSTR, MAC2STR(peer->addr));
765 24 : wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
766 : } else {
767 20 : if (ibss_rsn_is_auth_started(peer) == 0) {
768 0 : wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
769 : "Authenticator dropped as " MACSTR " is not "
770 0 : "authenticated", MAC2STR(peer->addr));
771 0 : os_free(tmp);
772 0 : return -1;
773 : }
774 :
775 120 : wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
776 120 : "from "MACSTR, MAC2STR(peer->addr));
777 20 : wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
778 : }
779 44 : os_free(tmp);
780 :
781 44 : return 1;
782 : }
783 :
784 :
785 44 : int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
786 : const u8 *buf, size_t len)
787 : {
788 : struct ibss_rsn_peer *peer;
789 :
790 44 : if (ibss_rsn == NULL)
791 0 : return -1;
792 :
793 44 : peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
794 44 : if (peer)
795 44 : return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
796 :
797 0 : if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
798 : /*
799 : * Create new IBSS peer based on an EAPOL message from the peer
800 : * Authenticator.
801 : */
802 0 : peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
803 0 : if (peer == NULL)
804 0 : return -1;
805 :
806 : /* assume the peer is authenticated already */
807 0 : wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
808 0 : MACSTR, MAC2STR(src_addr));
809 0 : ibss_rsn_peer_authenticated(ibss_rsn, peer,
810 : IBSS_RSN_AUTH_EAPOL_BY_US);
811 :
812 0 : return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
813 : buf, len);
814 : }
815 :
816 0 : return 0;
817 : }
818 :
819 4 : void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
820 : {
821 4 : if (ibss_rsn == NULL)
822 4 : return;
823 4 : os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
824 : }
825 :
826 :
827 9 : static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
828 : struct ibss_rsn_peer *peer,
829 : const u8* addr)
830 : {
831 54 : wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
832 54 : MAC2STR(addr));
833 :
834 17 : if (peer &&
835 8 : peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
836 2 : if (peer->own_auth_tx.sec) {
837 : struct os_reltime now, diff;
838 2 : os_get_reltime(&now);
839 2 : os_reltime_sub(&now, &peer->own_auth_tx, &diff);
840 2 : if (diff.sec == 0 && diff.usec < 500000) {
841 0 : wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
842 0 : (int) diff.usec);
843 0 : goto skip_reinit;
844 : }
845 : }
846 : /*
847 : * A peer sent us an Authentication frame even though it already
848 : * started an EAPOL session. We should reinit state machines
849 : * here, but it's much more complicated than just deleting and
850 : * recreating the state machine
851 : */
852 12 : wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
853 12 : MACSTR, MAC2STR(addr));
854 :
855 2 : ibss_rsn_stop(ibss_rsn, addr);
856 2 : peer = NULL;
857 : }
858 :
859 9 : if (!peer) {
860 3 : peer = ibss_rsn_peer_init(ibss_rsn, addr);
861 3 : if (!peer)
862 9 : return;
863 :
864 18 : wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
865 18 : MAC2STR(addr));
866 : }
867 :
868 : skip_reinit:
869 : /* reply with an Authentication frame now, before sending an EAPOL */
870 9 : ibss_rsn_send_auth(ibss_rsn, addr, 2);
871 : /* no need to start another AUTH challenge in the other way.. */
872 9 : ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
873 : }
874 :
875 :
876 18 : void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
877 : size_t len)
878 : {
879 : const struct ieee80211_mgmt *header;
880 : struct ibss_rsn_peer *peer;
881 : size_t auth_length;
882 :
883 18 : header = (const struct ieee80211_mgmt *) auth_frame;
884 18 : auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
885 :
886 18 : if (ibss_rsn == NULL || len < auth_length)
887 0 : return;
888 :
889 36 : if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
890 18 : le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
891 0 : return;
892 :
893 18 : peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
894 :
895 18 : switch (le_to_host16(header->u.auth.auth_transaction)) {
896 : case 1:
897 9 : ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
898 9 : break;
899 : case 2:
900 54 : wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
901 54 : MACSTR, MAC2STR(header->sa));
902 9 : if (!peer) {
903 0 : wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
904 0 : "unknown STA " MACSTR, MAC2STR(header->sa));
905 0 : break;
906 : }
907 :
908 : /* authentication has been completed */
909 9 : eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
910 54 : wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
911 54 : MAC2STR(header->sa));
912 9 : ibss_rsn_peer_authenticated(ibss_rsn, peer,
913 : IBSS_RSN_AUTH_BY_US);
914 9 : break;
915 : }
916 : }
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