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 :
27 301 : 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 :
32 355 : for (peer = ibss_rsn->peers; peer; peer = peer->next)
33 329 : if (os_memcmp(addr, peer->addr, ETH_ALEN) == 0)
34 275 : break;
35 301 : return peer;
36 : }
37 :
38 :
39 14 : static void ibss_rsn_free(struct ibss_rsn_peer *peer)
40 : {
41 14 : eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
42 14 : wpa_auth_sta_deinit(peer->auth);
43 14 : wpa_sm_deinit(peer->supp);
44 14 : os_free(peer);
45 14 : }
46 :
47 :
48 52 : static void supp_set_state(void *ctx, enum wpa_states state)
49 : {
50 52 : struct ibss_rsn_peer *peer = ctx;
51 52 : peer->supp_state = state;
52 52 : }
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 28 : static int supp_ether_send(void *ctx, const u8 *dest, u16 proto, const u8 *buf,
63 : size_t len)
64 : {
65 28 : struct ibss_rsn_peer *peer = ctx;
66 28 : struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
67 :
68 196 : wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR " proto=0x%04x "
69 : "len=%lu)",
70 168 : __func__, MAC2STR(dest), proto, (unsigned long) len);
71 :
72 28 : if (wpa_s->l2)
73 28 : return l2_packet_send(wpa_s->l2, dest, proto, buf, len);
74 :
75 0 : return -1;
76 : }
77 :
78 :
79 28 : 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 28 : wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)",
85 : __func__, type, data_len);
86 :
87 28 : *msg_len = sizeof(*hdr) + data_len;
88 28 : hdr = os_malloc(*msg_len);
89 28 : if (hdr == NULL)
90 0 : return NULL;
91 :
92 28 : hdr->version = 2;
93 28 : hdr->type = type;
94 28 : hdr->length = host_to_be16(data_len);
95 :
96 28 : if (data)
97 0 : os_memcpy(hdr + 1, data, data_len);
98 : else
99 28 : os_memset(hdr + 1, 0, data_len);
100 :
101 28 : if (data_pos)
102 28 : *data_pos = hdr + 1;
103 :
104 28 : return (u8 *) hdr;
105 : }
106 :
107 :
108 12 : static int supp_get_beacon_ie(void *ctx)
109 : {
110 12 : struct ibss_rsn_peer *peer = ctx;
111 :
112 12 : wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
113 : /* TODO: get correct RSN IE */
114 12 : 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 54 : static void ibss_check_rsn_completed(struct ibss_rsn_peer *peer)
124 : {
125 54 : struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
126 :
127 54 : 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 30 : return;
131 24 : if (peer->authentication_status & IBSS_RSN_REPORTED_PTK)
132 12 : return;
133 12 : peer->authentication_status |= IBSS_RSN_REPORTED_PTK;
134 72 : wpa_msg(wpa_s, MSG_INFO, IBSS_RSN_COMPLETED MACSTR,
135 72 : MAC2STR(peer->addr));
136 : }
137 :
138 :
139 24 : 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 24 : struct ibss_rsn_peer *peer = ctx;
145 :
146 144 : wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d "
147 : "set_tx=%d)",
148 144 : __func__, alg, MAC2STR(addr), key_idx, set_tx);
149 24 : wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len);
150 24 : wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len);
151 :
152 24 : if (key_idx == 0) {
153 12 : peer->authentication_status |= IBSS_RSN_SET_PTK_SUPP;
154 12 : 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 12 : if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr,
160 : ETH_ALEN) > 0) {
161 6 : wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK");
162 6 : return 0;
163 : }
164 : }
165 :
166 18 : if (is_broadcast_ether_addr(addr))
167 12 : addr = peer->addr;
168 18 : 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 16 : static void * supp_get_network_ctx(void *ctx)
174 : {
175 16 : struct ibss_rsn_peer *peer = ctx;
176 16 : return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s);
177 : }
178 :
179 :
180 24 : static int supp_mlme_setprotection(void *ctx, const u8 *addr,
181 : int protection_type, int key_type)
182 : {
183 144 : wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
184 : "key_type=%d)",
185 144 : __func__, MAC2STR(addr), protection_type, key_type);
186 24 : return 0;
187 : }
188 :
189 :
190 12 : static void supp_cancel_auth_timeout(void *ctx)
191 : {
192 12 : wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
193 12 : }
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 14 : static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
203 : const u8 *psk)
204 : {
205 14 : struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
206 14 : if (ctx == NULL)
207 0 : return -1;
208 :
209 14 : ctx->ctx = peer;
210 14 : ctx->msg_ctx = peer->ibss_rsn->wpa_s;
211 14 : ctx->set_state = supp_set_state;
212 14 : ctx->get_state = supp_get_state;
213 14 : ctx->ether_send = supp_ether_send;
214 14 : ctx->get_beacon_ie = supp_get_beacon_ie;
215 14 : ctx->alloc_eapol = supp_alloc_eapol;
216 14 : ctx->set_key = supp_set_key;
217 14 : ctx->get_network_ctx = supp_get_network_ctx;
218 14 : ctx->mlme_setprotection = supp_mlme_setprotection;
219 14 : ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
220 14 : ctx->deauthenticate = supp_deauthenticate;
221 14 : peer->supp = wpa_sm_init(ctx);
222 14 : if (peer->supp == NULL) {
223 0 : wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
224 0 : return -1;
225 : }
226 :
227 14 : wpa_sm_set_own_addr(peer->supp, own_addr);
228 14 : wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
229 14 : wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
230 14 : wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
231 14 : wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
232 14 : wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
233 14 : wpa_sm_set_pmk(peer->supp, psk, PMK_LEN, NULL);
234 :
235 14 : peer->supp_ie_len = sizeof(peer->supp_ie);
236 14 : 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 14 : wpa_sm_notify_assoc(peer->supp, peer->addr);
244 :
245 14 : return 0;
246 : }
247 :
248 :
249 106 : static void auth_logger(void *ctx, const u8 *addr, logger_level level,
250 : const char *txt)
251 : {
252 106 : if (addr)
253 636 : wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
254 636 : MAC2STR(addr), txt);
255 : else
256 0 : wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
257 106 : }
258 :
259 :
260 40 : static const u8 * auth_get_psk(void *ctx, const u8 *addr,
261 : const u8 *p2p_dev_addr, const u8 *prev_psk)
262 : {
263 40 : struct ibss_rsn *ibss_rsn = ctx;
264 240 : wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
265 240 : __func__, MAC2STR(addr), prev_psk);
266 40 : if (prev_psk)
267 0 : return NULL;
268 40 : return ibss_rsn->psk;
269 : }
270 :
271 :
272 32 : static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
273 : size_t data_len, int encrypt)
274 : {
275 32 : struct ibss_rsn *ibss_rsn = ctx;
276 32 : struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
277 :
278 192 : wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
279 : "encrypt=%d)",
280 192 : __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
281 :
282 32 : if (wpa_s->l2)
283 32 : return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
284 : data_len);
285 :
286 0 : return -1;
287 : }
288 :
289 :
290 54 : 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 54 : struct ibss_rsn *ibss_rsn = ctx;
294 : u8 seq[6];
295 :
296 54 : os_memset(seq, 0, sizeof(seq));
297 :
298 54 : if (addr) {
299 324 : wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
300 : " key_idx=%d)",
301 324 : __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 54 : wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
307 :
308 54 : if (idx == 0) {
309 42 : if (addr) {
310 : struct ibss_rsn_peer *peer;
311 42 : peer = ibss_rsn_get_peer(ibss_rsn, addr);
312 42 : if (peer) {
313 42 : peer->authentication_status |=
314 : IBSS_RSN_SET_PTK_AUTH;
315 42 : 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 84 : if (addr == NULL ||
323 42 : os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
324 21 : wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
325 21 : return 0;
326 : }
327 : }
328 :
329 33 : 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 28 : 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 28 : if (authorized) {
365 12 : res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
366 : WPA_STA_AUTHORIZED,
367 : WPA_STA_AUTHORIZED, ~0);
368 72 : wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
369 72 : MAC2STR(peer->addr));
370 : } else {
371 16 : res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
372 : 0, 0, ~WPA_STA_AUTHORIZED);
373 96 : wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
374 96 : MAC2STR(peer->addr));
375 : }
376 :
377 28 : 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 28 : }
383 :
384 :
385 156 : static void auth_set_eapol(void *ctx, const u8 *addr,
386 : wpa_eapol_variable var, int value)
387 : {
388 156 : struct ibss_rsn *ibss_rsn = ctx;
389 156 : struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
390 :
391 156 : if (peer == NULL)
392 156 : return;
393 :
394 156 : switch (var) {
395 : case WPA_EAPOL_authorized:
396 28 : ibss_set_sta_authorized(ibss_rsn, peer, value);
397 28 : break;
398 : default:
399 : /* do not handle any other event */
400 128 : wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
401 128 : break;
402 : }
403 : }
404 :
405 :
406 7 : 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 7 : wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
413 :
414 7 : os_memset(&conf, 0, sizeof(conf));
415 7 : conf.wpa = 2;
416 7 : conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
417 7 : conf.wpa_pairwise = WPA_CIPHER_CCMP;
418 7 : conf.rsn_pairwise = WPA_CIPHER_CCMP;
419 7 : conf.wpa_group = WPA_CIPHER_CCMP;
420 7 : conf.eapol_version = 2;
421 7 : conf.wpa_group_rekey = 600;
422 :
423 7 : os_memset(&cb, 0, sizeof(cb));
424 7 : cb.ctx = ibss_rsn;
425 7 : cb.logger = auth_logger;
426 7 : cb.set_eapol = auth_set_eapol;
427 7 : cb.send_eapol = auth_send_eapol;
428 7 : cb.get_psk = auth_get_psk;
429 7 : cb.set_key = auth_set_key;
430 7 : cb.for_each_sta = auth_for_each_sta;
431 7 : cb.disconnect = ibss_rsn_disconnect;
432 :
433 7 : ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb);
434 7 : if (ibss_rsn->auth_group == NULL) {
435 1 : wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
436 1 : return -1;
437 : }
438 :
439 6 : wpa_init_keys(ibss_rsn->auth_group);
440 :
441 6 : return 0;
442 : }
443 :
444 :
445 14 : static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
446 : struct ibss_rsn_peer *peer)
447 : {
448 14 : peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
449 14 : 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 14 : 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 14 : if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
467 0 : return -1;
468 :
469 14 : if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
470 0 : return -1;
471 :
472 14 : return 0;
473 : }
474 :
475 :
476 24 : static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
477 : {
478 : struct ieee80211_mgmt auth;
479 24 : const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
480 24 : struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
481 :
482 24 : if (wpa_s->driver->send_frame == NULL)
483 0 : return -1;
484 :
485 24 : os_memset(&auth, 0, sizeof(auth));
486 :
487 24 : auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
488 : WLAN_FC_STYPE_AUTH);
489 24 : os_memcpy(auth.da, da, ETH_ALEN);
490 24 : os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
491 24 : os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
492 :
493 24 : auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
494 24 : auth.u.auth.auth_transaction = host_to_le16(seq);
495 24 : auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
496 :
497 144 : wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
498 144 : seq, MAC2STR(da));
499 :
500 24 : return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth,
501 : auth_length, 0);
502 : }
503 :
504 :
505 48 : static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
506 : {
507 48 : 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 14 : ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
514 : {
515 : struct ibss_rsn_peer *peer;
516 14 : if (ibss_rsn == NULL)
517 0 : return NULL;
518 :
519 14 : peer = ibss_rsn_get_peer(ibss_rsn, addr);
520 14 : 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 84 : wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
527 84 : MAC2STR(addr));
528 :
529 14 : peer = os_zalloc(sizeof(*peer));
530 14 : if (peer == NULL) {
531 0 : wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
532 0 : return NULL;
533 : }
534 :
535 14 : peer->ibss_rsn = ibss_rsn;
536 14 : os_memcpy(peer->addr, addr, ETH_ALEN);
537 14 : peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
538 :
539 14 : if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
540 14 : ibss_rsn->psk) < 0) {
541 0 : ibss_rsn_free(peer);
542 0 : return NULL;
543 : }
544 :
545 14 : peer->next = ibss_rsn->peers;
546 14 : ibss_rsn->peers = peer;
547 :
548 14 : 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 14 : int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
570 : {
571 : struct ibss_rsn_peer *peer;
572 : int res;
573 :
574 14 : if (!ibss_rsn)
575 1 : return -1;
576 :
577 : /* if the peer already exists, exit immediately */
578 13 : peer = ibss_rsn_get_peer(ibss_rsn, addr);
579 13 : if (peer)
580 1 : return 0;
581 :
582 12 : peer = ibss_rsn_peer_init(ibss_rsn, addr);
583 12 : if (peer == NULL)
584 0 : return -1;
585 :
586 : /* Open Authentication: send first Authentication frame */
587 12 : res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
588 12 : if (res) {
589 : /*
590 : * The driver may not support Authentication frame exchange in
591 : * IBSS. Ignore authentication and go through EAPOL exchange.
592 : */
593 0 : peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
594 0 : return ibss_rsn_auth_init(ibss_rsn, peer);
595 : } else {
596 12 : os_get_reltime(&peer->own_auth_tx);
597 12 : eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
598 : }
599 :
600 12 : return 0;
601 : }
602 :
603 :
604 24 : static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
605 : struct ibss_rsn_peer *peer, int reason)
606 : {
607 : int already_started;
608 :
609 24 : if (ibss_rsn == NULL || peer == NULL)
610 0 : return -1;
611 :
612 24 : already_started = ibss_rsn_is_auth_started(peer);
613 24 : peer->authentication_status |= reason;
614 :
615 24 : if (already_started) {
616 60 : wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
617 60 : "started for peer " MACSTR, MAC2STR(peer->addr));
618 10 : return 0;
619 : }
620 :
621 84 : wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
622 84 : "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
623 :
624 14 : return ibss_rsn_auth_init(ibss_rsn, peer);
625 : }
626 :
627 :
628 4 : void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
629 : {
630 : struct ibss_rsn_peer *peer, *prev;
631 :
632 4 : if (ibss_rsn == NULL)
633 4 : return;
634 :
635 4 : if (peermac == NULL) {
636 : /* remove all peers */
637 0 : wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
638 0 : peer = ibss_rsn->peers;
639 0 : while (peer) {
640 0 : prev = peer;
641 0 : peer = peer->next;
642 0 : ibss_rsn_free(prev);
643 0 : ibss_rsn->peers = peer;
644 : }
645 : } else {
646 : /* remove specific peer */
647 24 : wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
648 24 : __func__, MAC2STR(peermac));
649 :
650 9 : for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
651 1 : prev = peer, peer = peer->next) {
652 5 : if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
653 4 : if (prev == NULL)
654 3 : ibss_rsn->peers = peer->next;
655 : else
656 1 : prev->next = peer->next;
657 4 : ibss_rsn_free(peer);
658 4 : wpa_printf(MSG_DEBUG, "%s: Successfully "
659 : "removed a specific peer",
660 : __func__);
661 4 : break;
662 : }
663 : }
664 : }
665 : }
666 :
667 :
668 7 : struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s)
669 : {
670 : struct ibss_rsn *ibss_rsn;
671 :
672 7 : ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
673 7 : if (ibss_rsn == NULL)
674 0 : return NULL;
675 7 : ibss_rsn->wpa_s = wpa_s;
676 :
677 7 : if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr) < 0) {
678 1 : ibss_rsn_deinit(ibss_rsn);
679 1 : return NULL;
680 : }
681 :
682 6 : return ibss_rsn;
683 : }
684 :
685 :
686 11414 : void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
687 : {
688 : struct ibss_rsn_peer *peer, *prev;
689 :
690 11414 : if (ibss_rsn == NULL)
691 22821 : return;
692 :
693 7 : peer = ibss_rsn->peers;
694 24 : while (peer) {
695 10 : prev = peer;
696 10 : peer = peer->next;
697 10 : ibss_rsn_free(prev);
698 : }
699 :
700 7 : if (ibss_rsn->auth_group)
701 6 : wpa_deinit(ibss_rsn->auth_group);
702 7 : os_free(ibss_rsn);
703 :
704 : }
705 :
706 :
707 52 : static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
708 : {
709 : const struct ieee802_1x_hdr *hdr;
710 : const struct wpa_eapol_key *key;
711 : u16 key_info;
712 : size_t plen;
713 :
714 : /* TODO: Support other EAPOL packets than just EAPOL-Key */
715 :
716 52 : if (len < sizeof(*hdr) + sizeof(*key))
717 0 : return -1;
718 :
719 52 : hdr = (const struct ieee802_1x_hdr *) buf;
720 52 : key = (const struct wpa_eapol_key *) (hdr + 1);
721 52 : plen = be_to_host16(hdr->length);
722 :
723 52 : if (hdr->version < EAPOL_VERSION) {
724 : /* TODO: backwards compatibility */
725 : }
726 52 : if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
727 0 : wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
728 0 : "not a Key frame", hdr->type);
729 0 : return -1;
730 : }
731 52 : if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
732 0 : wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
733 : "invalid (frame size %lu)",
734 : (unsigned long) plen, (unsigned long) len);
735 0 : return -1;
736 : }
737 :
738 52 : if (key->type != EAPOL_KEY_TYPE_RSN) {
739 0 : wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
740 0 : "discarded", key->type);
741 0 : return -1;
742 : }
743 :
744 52 : key_info = WPA_GET_BE16(key->key_info);
745 :
746 52 : return !!(key_info & WPA_KEY_INFO_ACK);
747 : }
748 :
749 :
750 52 : static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
751 : struct ibss_rsn_peer *peer,
752 : const u8 *buf, size_t len)
753 : {
754 : int supp;
755 : u8 *tmp;
756 :
757 52 : supp = ibss_rsn_eapol_dst_supp(buf, len);
758 52 : if (supp < 0)
759 0 : return -1;
760 :
761 52 : tmp = os_malloc(len);
762 52 : if (tmp == NULL)
763 0 : return -1;
764 52 : os_memcpy(tmp, buf, len);
765 52 : if (supp) {
766 28 : peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
767 168 : wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
768 168 : MACSTR, MAC2STR(peer->addr));
769 28 : wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
770 : } else {
771 24 : if (ibss_rsn_is_auth_started(peer) == 0) {
772 0 : wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
773 : "Authenticator dropped as " MACSTR " is not "
774 0 : "authenticated", MAC2STR(peer->addr));
775 0 : os_free(tmp);
776 0 : return -1;
777 : }
778 :
779 144 : wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
780 144 : "from "MACSTR, MAC2STR(peer->addr));
781 24 : wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
782 : }
783 52 : os_free(tmp);
784 :
785 52 : return 1;
786 : }
787 :
788 :
789 52 : int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
790 : const u8 *buf, size_t len)
791 : {
792 : struct ibss_rsn_peer *peer;
793 :
794 52 : if (ibss_rsn == NULL)
795 0 : return -1;
796 :
797 52 : peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
798 52 : if (peer)
799 52 : return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
800 :
801 0 : if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
802 : /*
803 : * Create new IBSS peer based on an EAPOL message from the peer
804 : * Authenticator.
805 : */
806 0 : peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
807 0 : if (peer == NULL)
808 0 : return -1;
809 :
810 : /* assume the peer is authenticated already */
811 0 : wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
812 0 : MACSTR, MAC2STR(src_addr));
813 0 : ibss_rsn_peer_authenticated(ibss_rsn, peer,
814 : IBSS_RSN_AUTH_EAPOL_BY_US);
815 :
816 0 : return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
817 : buf, len);
818 : }
819 :
820 0 : return 0;
821 : }
822 :
823 6 : void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
824 : {
825 6 : if (ibss_rsn == NULL)
826 6 : return;
827 6 : os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
828 : }
829 :
830 :
831 12 : static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
832 : struct ibss_rsn_peer *peer,
833 : const u8* addr)
834 : {
835 72 : wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
836 72 : MAC2STR(addr));
837 :
838 24 : if (peer &&
839 12 : peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
840 2 : if (peer->own_auth_tx.sec) {
841 : struct os_reltime now, diff;
842 2 : os_get_reltime(&now);
843 2 : os_reltime_sub(&now, &peer->own_auth_tx, &diff);
844 2 : if (diff.sec == 0 && diff.usec < 500000) {
845 0 : wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
846 0 : (int) diff.usec);
847 0 : goto skip_reinit;
848 : }
849 : }
850 : /*
851 : * A peer sent us an Authentication frame even though it already
852 : * started an EAPOL session. We should reinit state machines
853 : * here, but it's much more complicated than just deleting and
854 : * recreating the state machine
855 : */
856 12 : wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
857 12 : MACSTR, MAC2STR(addr));
858 :
859 2 : ibss_rsn_stop(ibss_rsn, addr);
860 2 : peer = NULL;
861 : }
862 :
863 12 : if (!peer) {
864 2 : peer = ibss_rsn_peer_init(ibss_rsn, addr);
865 2 : if (!peer)
866 12 : return;
867 :
868 12 : wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
869 12 : MAC2STR(addr));
870 : }
871 :
872 : skip_reinit:
873 : /* reply with an Authentication frame now, before sending an EAPOL */
874 12 : ibss_rsn_send_auth(ibss_rsn, addr, 2);
875 : /* no need to start another AUTH challenge in the other way.. */
876 12 : ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
877 : }
878 :
879 :
880 24 : void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
881 : size_t len)
882 : {
883 : const struct ieee80211_mgmt *header;
884 : struct ibss_rsn_peer *peer;
885 : size_t auth_length;
886 :
887 24 : header = (const struct ieee80211_mgmt *) auth_frame;
888 24 : auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
889 :
890 24 : if (ibss_rsn == NULL || len < auth_length)
891 0 : return;
892 :
893 48 : if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
894 24 : le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
895 0 : return;
896 :
897 24 : peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
898 :
899 24 : switch (le_to_host16(header->u.auth.auth_transaction)) {
900 : case 1:
901 12 : ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
902 12 : break;
903 : case 2:
904 72 : wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
905 72 : MACSTR, MAC2STR(header->sa));
906 12 : if (!peer) {
907 0 : wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
908 0 : "unknown STA " MACSTR, MAC2STR(header->sa));
909 0 : break;
910 : }
911 :
912 : /* authentication has been completed */
913 12 : eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
914 72 : wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
915 72 : MAC2STR(header->sa));
916 12 : ibss_rsn_peer_authenticated(ibss_rsn, peer,
917 : IBSS_RSN_AUTH_BY_US);
918 12 : break;
919 : }
920 : }
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