1 /*
2  * wpa_supplicant - IBSS RSN
3  * Copyright (c) 2009-2013, Jouni Malinen <j@w1.fi>
4  *
5  * This software may be distributed under the terms of the BSD license.
6  * See README for more details.
7  */
8 
9 #include "includes.h"
10 
11 #include "common.h"
12 #include "common/wpa_ctrl.h"
13 #include "utils/eloop.h"
14 #include "l2_packet/l2_packet.h"
15 #include "rsn_supp/wpa.h"
16 #include "rsn_supp/wpa_ie.h"
17 #include "ap/wpa_auth.h"
18 #include "wpa_supplicant_i.h"
19 #include "driver_i.h"
20 #include "common/ieee802_11_defs.h"
21 #include "ibss_rsn.h"
22 
23 
24 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx);
25 
26 
ibss_rsn_get_peer(struct ibss_rsn * ibss_rsn,const u8 * addr)27 static struct ibss_rsn_peer * ibss_rsn_get_peer(struct ibss_rsn *ibss_rsn,
28 						const u8 *addr)
29 {
30 	struct ibss_rsn_peer *peer;
31 
32 	for (peer = ibss_rsn->peers; peer; peer = peer->next)
33 		if (os_memcmp(addr, peer->addr, ETH_ALEN) == 0)
34 			break;
35 	return peer;
36 }
37 
38 
ibss_rsn_free(struct ibss_rsn_peer * peer)39 static void ibss_rsn_free(struct ibss_rsn_peer *peer)
40 {
41 	eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
42 	wpa_auth_sta_deinit(peer->auth);
43 	wpa_sm_deinit(peer->supp);
44 	os_free(peer);
45 }
46 
47 
supp_set_state(void * ctx,enum wpa_states state)48 static void supp_set_state(void *ctx, enum wpa_states state)
49 {
50 	struct ibss_rsn_peer *peer = ctx;
51 	peer->supp_state = state;
52 }
53 
54 
supp_get_state(void * ctx)55 static enum wpa_states supp_get_state(void *ctx)
56 {
57 	struct ibss_rsn_peer *peer = ctx;
58 	return peer->supp_state;
59 }
60 
61 
supp_ether_send(void * ctx,const u8 * dest,u16 proto,const u8 * buf,size_t len)62 static int supp_ether_send(void *ctx, const u8 *dest, u16 proto, const u8 *buf,
63 			   size_t len)
64 {
65 	struct ibss_rsn_peer *peer = ctx;
66 	struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
67 	int encrypt = peer->authentication_status & IBSS_RSN_REPORTED_PTK;
68 
69 	wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR
70 		   " proto=0x%04x len=%lu no_encrypt=%d)",
71 		   __func__, MAC2STR(dest), proto, (unsigned long) len,
72 		   !encrypt);
73 
74 	if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_CONTROL_PORT)
75 		return wpa_drv_tx_control_port(wpa_s, dest, proto, buf, len,
76 					       !encrypt);
77 
78 	if (wpa_s->l2)
79 		return l2_packet_send(wpa_s->l2, dest, proto, buf, len);
80 
81 	return -1;
82 }
83 
84 
supp_alloc_eapol(void * ctx,u8 type,const void * data,u16 data_len,size_t * msg_len,void ** data_pos)85 static u8 * supp_alloc_eapol(void *ctx, u8 type, const void *data,
86 			     u16 data_len, size_t *msg_len, void **data_pos)
87 {
88 	struct ieee802_1x_hdr *hdr;
89 
90 	wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)",
91 		   __func__, type, data_len);
92 
93 	*msg_len = sizeof(*hdr) + data_len;
94 	hdr = os_malloc(*msg_len);
95 	if (hdr == NULL)
96 		return NULL;
97 
98 	hdr->version = 2;
99 	hdr->type = type;
100 	hdr->length = host_to_be16(data_len);
101 
102 	if (data)
103 		os_memcpy(hdr + 1, data, data_len);
104 	else
105 		os_memset(hdr + 1, 0, data_len);
106 
107 	if (data_pos)
108 		*data_pos = hdr + 1;
109 
110 	return (u8 *) hdr;
111 }
112 
113 
supp_get_beacon_ie(void * ctx)114 static int supp_get_beacon_ie(void *ctx)
115 {
116 	struct ibss_rsn_peer *peer = ctx;
117 
118 	wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
119 	/* TODO: get correct RSN IE */
120 	wpa_sm_set_ap_rsnxe(peer->supp, NULL, 0);
121 	return wpa_sm_set_ap_rsn_ie(peer->supp,
122 				    (u8 *) "\x30\x14\x01\x00"
123 				    "\x00\x0f\xac\x04"
124 				    "\x01\x00\x00\x0f\xac\x04"
125 				    "\x01\x00\x00\x0f\xac\x02"
126 				    "\x00\x00", 22);
127 }
128 
129 
ibss_check_rsn_completed(struct ibss_rsn_peer * peer)130 static void ibss_check_rsn_completed(struct ibss_rsn_peer *peer)
131 {
132 	struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
133 
134 	if ((peer->authentication_status &
135 	     (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH)) !=
136 	    (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH))
137 		return;
138 	if (peer->authentication_status & IBSS_RSN_REPORTED_PTK)
139 		return;
140 	peer->authentication_status |= IBSS_RSN_REPORTED_PTK;
141 	wpa_msg(wpa_s, MSG_INFO, IBSS_RSN_COMPLETED MACSTR,
142 		MAC2STR(peer->addr));
143 }
144 
145 
supp_set_key(void * ctx,enum wpa_alg alg,const u8 * addr,int key_idx,int set_tx,const u8 * seq,size_t seq_len,const u8 * key,size_t key_len,enum key_flag key_flag)146 static int supp_set_key(void *ctx, enum wpa_alg alg,
147 			const u8 *addr, int key_idx, int set_tx,
148 			const u8 *seq, size_t seq_len,
149 			const u8 *key, size_t key_len, enum key_flag key_flag)
150 {
151 	struct ibss_rsn_peer *peer = ctx;
152 
153 	wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d "
154 		   "set_tx=%d)",
155 		   __func__, alg, MAC2STR(addr), key_idx, set_tx);
156 	wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len);
157 	wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len);
158 
159 	if (key_idx == 0) {
160 		peer->authentication_status |= IBSS_RSN_SET_PTK_SUPP;
161 		ibss_check_rsn_completed(peer);
162 		/*
163 		 * In IBSS RSN, the pairwise key from the 4-way handshake
164 		 * initiated by the peer with highest MAC address is used.
165 		 */
166 		if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr,
167 			      ETH_ALEN) > 0) {
168 			wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK");
169 			return 0;
170 		}
171 	}
172 
173 	if (is_broadcast_ether_addr(addr))
174 		addr = peer->addr;
175 	return wpa_drv_set_key(peer->ibss_rsn->wpa_s, alg, addr, key_idx,
176 			       set_tx, seq, seq_len, key, key_len, key_flag);
177 }
178 
179 
supp_get_network_ctx(void * ctx)180 static void * supp_get_network_ctx(void *ctx)
181 {
182 	struct ibss_rsn_peer *peer = ctx;
183 	return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s);
184 }
185 
186 
supp_mlme_setprotection(void * ctx,const u8 * addr,int protection_type,int key_type)187 static int supp_mlme_setprotection(void *ctx, const u8 *addr,
188 				   int protection_type, int key_type)
189 {
190 	wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
191 		   "key_type=%d)",
192 		   __func__, MAC2STR(addr), protection_type, key_type);
193 	return 0;
194 }
195 
196 
supp_cancel_auth_timeout(void * ctx)197 static void supp_cancel_auth_timeout(void *ctx)
198 {
199 	wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
200 }
201 
202 
supp_deauthenticate(void * ctx,u16 reason_code)203 static void supp_deauthenticate(void *ctx, u16 reason_code)
204 {
205 	wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
206 }
207 
208 
supp_reconnect(void * ctx)209 static void supp_reconnect(void *ctx)
210 {
211 	wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
212 }
213 
214 
ibss_rsn_supp_init(struct ibss_rsn_peer * peer,const u8 * own_addr,const u8 * psk)215 static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
216 			      const u8 *psk)
217 {
218 	struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
219 	if (ctx == NULL)
220 		return -1;
221 
222 	ctx->ctx = peer;
223 	ctx->msg_ctx = peer->ibss_rsn->wpa_s;
224 	ctx->set_state = supp_set_state;
225 	ctx->get_state = supp_get_state;
226 	ctx->ether_send = supp_ether_send;
227 	ctx->get_beacon_ie = supp_get_beacon_ie;
228 	ctx->alloc_eapol = supp_alloc_eapol;
229 	ctx->set_key = supp_set_key;
230 	ctx->get_network_ctx = supp_get_network_ctx;
231 	ctx->mlme_setprotection = supp_mlme_setprotection;
232 	ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
233 	ctx->deauthenticate = supp_deauthenticate;
234 	ctx->reconnect = supp_reconnect;
235 	peer->supp = wpa_sm_init(ctx);
236 	if (peer->supp == NULL) {
237 		wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
238 		os_free(ctx);
239 		return -1;
240 	}
241 
242 	wpa_sm_set_own_addr(peer->supp, own_addr);
243 	wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
244 	wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
245 	wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
246 	wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
247 	wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
248 	wpa_sm_set_pmk(peer->supp, psk, PMK_LEN, NULL, NULL);
249 
250 	peer->supp_ie_len = sizeof(peer->supp_ie);
251 	if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
252 					    &peer->supp_ie_len) < 0) {
253 		wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
254 			   " failed");
255 		return -1;
256 	}
257 
258 	wpa_sm_notify_assoc(peer->supp, peer->addr);
259 
260 	return 0;
261 }
262 
263 
auth_logger(void * ctx,const u8 * addr,logger_level level,const char * txt)264 static void auth_logger(void *ctx, const u8 *addr, logger_level level,
265 			const char *txt)
266 {
267 	if (addr)
268 		wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
269 			   MAC2STR(addr), txt);
270 	else
271 		wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
272 }
273 
274 
auth_get_psk(void * ctx,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk,size_t * psk_len,int * vlan_id)275 static const u8 * auth_get_psk(void *ctx, const u8 *addr,
276 			       const u8 *p2p_dev_addr, const u8 *prev_psk,
277 			       size_t *psk_len, int *vlan_id)
278 {
279 	struct ibss_rsn *ibss_rsn = ctx;
280 
281 	if (psk_len)
282 		*psk_len = PMK_LEN;
283 	if (vlan_id)
284 		*vlan_id = 0;
285 	wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
286 		   __func__, MAC2STR(addr), prev_psk);
287 	if (prev_psk)
288 		return NULL;
289 	return ibss_rsn->psk;
290 }
291 
292 
auth_send_eapol(void * ctx,const u8 * addr,const u8 * data,size_t data_len,int encrypt)293 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
294 			   size_t data_len, int encrypt)
295 {
296 	struct ibss_rsn *ibss_rsn = ctx;
297 	struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
298 
299 	wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
300 		   "encrypt=%d)",
301 		   __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
302 
303 	if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_CONTROL_PORT)
304 		return wpa_drv_tx_control_port(wpa_s, addr, ETH_P_EAPOL,
305 					       data, data_len, !encrypt);
306 
307 	if (wpa_s->l2)
308 		return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
309 				      data_len);
310 
311 	return -1;
312 }
313 
314 
auth_set_key(void * ctx,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len,enum key_flag key_flag)315 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
316 			const u8 *addr, int idx, u8 *key, size_t key_len,
317 			enum key_flag key_flag)
318 {
319 	struct ibss_rsn *ibss_rsn = ctx;
320 	u8 seq[6];
321 
322 	os_memset(seq, 0, sizeof(seq));
323 
324 	if (addr) {
325 		wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
326 			   " key_idx=%d)",
327 			   __func__, alg, MAC2STR(addr), idx);
328 	} else {
329 		wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
330 			   __func__, alg, idx);
331 	}
332 	wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
333 
334 	if (idx == 0) {
335 		if (addr) {
336 			struct ibss_rsn_peer *peer;
337 			peer = ibss_rsn_get_peer(ibss_rsn, addr);
338 			if (peer) {
339 				peer->authentication_status |=
340 					IBSS_RSN_SET_PTK_AUTH;
341 				ibss_check_rsn_completed(peer);
342 			}
343 		}
344 		/*
345 		 * In IBSS RSN, the pairwise key from the 4-way handshake
346 		 * initiated by the peer with highest MAC address is used.
347 		 */
348 		if (addr == NULL ||
349 		    os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
350 			wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
351 			return 0;
352 		}
353 	}
354 
355 	return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
356 			       1, seq, 6, key, key_len, key_flag);
357 }
358 
359 
ibss_rsn_disconnect(void * ctx,const u8 * addr,u16 reason)360 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
361 {
362 	struct ibss_rsn *ibss_rsn = ctx;
363 	wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
364 }
365 
366 
auth_for_each_sta(void * ctx,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)367 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
368 						  void *ctx),
369 			     void *cb_ctx)
370 {
371 	struct ibss_rsn *ibss_rsn = ctx;
372 	struct ibss_rsn_peer *peer;
373 
374 	wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
375 
376 	for (peer = ibss_rsn->peers; peer; peer = peer->next) {
377 		if (peer->auth && cb(peer->auth, cb_ctx))
378 			return 1;
379 	}
380 
381 	return 0;
382 }
383 
384 
ibss_set_sta_authorized(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int authorized)385 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
386 				    struct ibss_rsn_peer *peer, int authorized)
387 {
388 	int res;
389 
390 	if (authorized) {
391 		res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
392 					    WPA_STA_AUTHORIZED,
393 					    WPA_STA_AUTHORIZED, ~0);
394 		wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
395 			   MAC2STR(peer->addr));
396 	} else {
397 		res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
398 					    0, 0, ~WPA_STA_AUTHORIZED);
399 		wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
400 			   MAC2STR(peer->addr));
401 	}
402 
403 	if (res && errno != ENOENT) {
404 		wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
405 			   "for kernel driver (errno=%d)",
406 			   MAC2STR(peer->addr), errno);
407 	}
408 }
409 
410 
auth_set_eapol(void * ctx,const u8 * addr,wpa_eapol_variable var,int value)411 static void auth_set_eapol(void *ctx, const u8 *addr,
412 				       wpa_eapol_variable var, int value)
413 {
414 	struct ibss_rsn *ibss_rsn = ctx;
415 	struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
416 
417 	if (peer == NULL)
418 		return;
419 
420 	switch (var) {
421 	case WPA_EAPOL_authorized:
422 		ibss_set_sta_authorized(ibss_rsn, peer, value);
423 		break;
424 	default:
425 		/* do not handle any other event */
426 		wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
427 		break;
428 	}
429 }
430 
431 
ibss_rsn_auth_init_group(struct ibss_rsn * ibss_rsn,const u8 * own_addr,struct wpa_ssid * ssid)432 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
433 				    const u8 *own_addr, struct wpa_ssid *ssid)
434 {
435 	struct wpa_auth_config conf;
436 	static const struct wpa_auth_callbacks cb = {
437 		.logger = auth_logger,
438 		.set_eapol = auth_set_eapol,
439 		.send_eapol = auth_send_eapol,
440 		.get_psk = auth_get_psk,
441 		.set_key = auth_set_key,
442 		.for_each_sta = auth_for_each_sta,
443 		.disconnect = ibss_rsn_disconnect,
444 	};
445 
446 	wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
447 
448 	os_memset(&conf, 0, sizeof(conf));
449 	conf.wpa = 2;
450 	conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
451 	conf.wpa_pairwise = WPA_CIPHER_CCMP;
452 	conf.rsn_pairwise = WPA_CIPHER_CCMP;
453 	conf.wpa_group = WPA_CIPHER_CCMP;
454 	conf.eapol_version = 2;
455 	conf.wpa_group_rekey = ssid->group_rekey ? ssid->group_rekey : 600;
456 	conf.wpa_group_update_count = 4;
457 	conf.wpa_pairwise_update_count = 4;
458 
459 	ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb, ibss_rsn);
460 	if (ibss_rsn->auth_group == NULL) {
461 		wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
462 		return -1;
463 	}
464 
465 	wpa_init_keys(ibss_rsn->auth_group);
466 
467 	return 0;
468 }
469 
470 
ibss_rsn_auth_init(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer)471 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
472 			      struct ibss_rsn_peer *peer)
473 {
474 	peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
475 	if (peer->auth == NULL) {
476 		wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
477 		return -1;
478 	}
479 
480 	/* TODO: get peer RSN IE with Probe Request */
481 	if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth, 0,
482 				(u8 *) "\x30\x14\x01\x00"
483 				"\x00\x0f\xac\x04"
484 				"\x01\x00\x00\x0f\xac\x04"
485 				"\x01\x00\x00\x0f\xac\x02"
486 				"\x00\x00", 22, NULL, 0, NULL, 0, NULL, 0) !=
487 	    WPA_IE_OK) {
488 		wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
489 		return -1;
490 	}
491 
492 	if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
493 		return -1;
494 
495 	if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
496 		return -1;
497 
498 	return 0;
499 }
500 
501 
ibss_rsn_send_auth(struct ibss_rsn * ibss_rsn,const u8 * da,int seq)502 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
503 {
504 	struct ieee80211_mgmt auth;
505 	const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
506 	struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
507 
508 	os_memset(&auth, 0, sizeof(auth));
509 
510 	auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
511 					  WLAN_FC_STYPE_AUTH);
512 	os_memcpy(auth.da, da, ETH_ALEN);
513 	os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
514 	os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
515 
516 	auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
517 	auth.u.auth.auth_transaction = host_to_le16(seq);
518 	auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
519 
520 	wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
521 		   seq, MAC2STR(da));
522 
523 	return wpa_drv_send_mlme(wpa_s, (u8 *) &auth, auth_length, 0, 0, 0);
524 }
525 
526 
ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)527 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
528 {
529 	return peer->authentication_status &
530 	       (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
531 }
532 
533 
534 static struct ibss_rsn_peer *
ibss_rsn_peer_init(struct ibss_rsn * ibss_rsn,const u8 * addr)535 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
536 {
537 	struct ibss_rsn_peer *peer;
538 	if (ibss_rsn == NULL)
539 		return NULL;
540 
541 	peer = ibss_rsn_get_peer(ibss_rsn, addr);
542 	if (peer) {
543 		wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
544 			   " already running", MAC2STR(addr));
545 		return peer;
546 	}
547 
548 	wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
549 		   MAC2STR(addr));
550 
551 	peer = os_zalloc(sizeof(*peer));
552 	if (peer == NULL) {
553 		wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
554 		return NULL;
555 	}
556 
557 	peer->ibss_rsn = ibss_rsn;
558 	os_memcpy(peer->addr, addr, ETH_ALEN);
559 	peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
560 
561 	if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
562 			       ibss_rsn->psk) < 0) {
563 		ibss_rsn_free(peer);
564 		return NULL;
565 	}
566 
567 	peer->next = ibss_rsn->peers;
568 	ibss_rsn->peers = peer;
569 
570 	return peer;
571 }
572 
573 
ibss_rsn_auth_timeout(void * eloop_ctx,void * timeout_ctx)574 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
575 {
576 	struct ibss_rsn_peer *peer = eloop_ctx;
577 
578 	/*
579 	 * Assume peer does not support Authentication exchange or the frame was
580 	 * lost somewhere - start EAPOL Authenticator.
581 	 */
582 	wpa_printf(MSG_DEBUG,
583 		   "RSN: Timeout on waiting Authentication frame response from "
584 		   MACSTR " - start authenticator", MAC2STR(peer->addr));
585 
586 	peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
587 	ibss_rsn_auth_init(peer->ibss_rsn, peer);
588 }
589 
590 
ibss_rsn_start(struct ibss_rsn * ibss_rsn,const u8 * addr)591 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
592 {
593 	struct ibss_rsn_peer *peer;
594 	int res;
595 
596 	if (!ibss_rsn)
597 		return -1;
598 
599 	/* if the peer already exists, exit immediately */
600 	peer = ibss_rsn_get_peer(ibss_rsn, addr);
601 	if (peer)
602 		return 0;
603 
604 	peer = ibss_rsn_peer_init(ibss_rsn, addr);
605 	if (peer == NULL)
606 		return -1;
607 
608 	/* Open Authentication: send first Authentication frame */
609 	res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
610 	if (res) {
611 		/*
612 		 * The driver may not support Authentication frame exchange in
613 		 * IBSS. Ignore authentication and go through EAPOL exchange.
614 		 */
615 		peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
616 		return ibss_rsn_auth_init(ibss_rsn, peer);
617 	} else {
618 		os_get_reltime(&peer->own_auth_tx);
619 		eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
620 	}
621 
622 	return 0;
623 }
624 
625 
ibss_rsn_peer_authenticated(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,int reason)626 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
627 				       struct ibss_rsn_peer *peer, int reason)
628 {
629 	int already_started;
630 
631 	if (ibss_rsn == NULL || peer == NULL)
632 		return -1;
633 
634 	already_started = ibss_rsn_is_auth_started(peer);
635 	peer->authentication_status |= reason;
636 
637 	if (already_started) {
638 		wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
639 			   "started for peer " MACSTR, MAC2STR(peer->addr));
640 		return 0;
641 	}
642 
643 	wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
644 		   "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
645 
646 	return ibss_rsn_auth_init(ibss_rsn, peer);
647 }
648 
649 
ibss_rsn_stop(struct ibss_rsn * ibss_rsn,const u8 * peermac)650 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
651 {
652 	struct ibss_rsn_peer *peer, *prev;
653 
654 	if (ibss_rsn == NULL)
655 		return;
656 
657 	if (peermac == NULL) {
658 		/* remove all peers */
659 		wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
660 		peer = ibss_rsn->peers;
661 		while (peer) {
662 			prev = peer;
663 			peer = peer->next;
664 			ibss_rsn_free(prev);
665 			ibss_rsn->peers = peer;
666 		}
667 	} else {
668 		/* remove specific peer */
669 		wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
670 			   __func__, MAC2STR(peermac));
671 
672 		for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
673 		     prev = peer, peer = peer->next) {
674 			if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
675 				if (prev == NULL)
676 					ibss_rsn->peers = peer->next;
677 				else
678 					prev->next = peer->next;
679 				ibss_rsn_free(peer);
680 				wpa_printf(MSG_DEBUG, "%s: Successfully "
681 					   "removed a specific peer",
682 					   __func__);
683 				break;
684 			}
685 		}
686 	}
687 }
688 
689 
ibss_rsn_init(struct wpa_supplicant * wpa_s,struct wpa_ssid * ssid)690 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s,
691 				struct wpa_ssid *ssid)
692 {
693 	struct ibss_rsn *ibss_rsn;
694 
695 	ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
696 	if (ibss_rsn == NULL)
697 		return NULL;
698 	ibss_rsn->wpa_s = wpa_s;
699 
700 	if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr, ssid) < 0) {
701 		ibss_rsn_deinit(ibss_rsn);
702 		return NULL;
703 	}
704 
705 	return ibss_rsn;
706 }
707 
708 
ibss_rsn_deinit(struct ibss_rsn * ibss_rsn)709 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
710 {
711 	struct ibss_rsn_peer *peer, *prev;
712 
713 	if (ibss_rsn == NULL)
714 		return;
715 
716 	peer = ibss_rsn->peers;
717 	while (peer) {
718 		prev = peer;
719 		peer = peer->next;
720 		ibss_rsn_free(prev);
721 	}
722 
723 	if (ibss_rsn->auth_group)
724 		wpa_deinit(ibss_rsn->auth_group);
725 	os_free(ibss_rsn);
726 
727 }
728 
729 
ibss_rsn_eapol_dst_supp(const u8 * buf,size_t len)730 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
731 {
732 	const struct ieee802_1x_hdr *hdr;
733 	const struct wpa_eapol_key *key;
734 	u16 key_info;
735 	size_t plen;
736 
737 	/* TODO: Support other EAPOL packets than just EAPOL-Key */
738 
739 	if (len < sizeof(*hdr) + sizeof(*key))
740 		return -1;
741 
742 	hdr = (const struct ieee802_1x_hdr *) buf;
743 	key = (const struct wpa_eapol_key *) (hdr + 1);
744 	plen = be_to_host16(hdr->length);
745 
746 	if (hdr->version < EAPOL_VERSION) {
747 		/* TODO: backwards compatibility */
748 	}
749 	if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
750 		wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
751 			"not a Key frame", hdr->type);
752 		return -1;
753 	}
754 	if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
755 		wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
756 			   "invalid (frame size %lu)",
757 			   (unsigned long) plen, (unsigned long) len);
758 		return -1;
759 	}
760 
761 	if (key->type != EAPOL_KEY_TYPE_RSN) {
762 		wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
763 			   "discarded", key->type);
764 		return -1;
765 	}
766 
767 	key_info = WPA_GET_BE16(key->key_info);
768 
769 	return !!(key_info & WPA_KEY_INFO_ACK);
770 }
771 
772 
ibss_rsn_process_rx_eapol(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * buf,size_t len)773 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
774 				     struct ibss_rsn_peer *peer,
775 				     const u8 *buf, size_t len)
776 {
777 	int supp;
778 	u8 *tmp;
779 
780 	supp = ibss_rsn_eapol_dst_supp(buf, len);
781 	if (supp < 0)
782 		return -1;
783 
784 	tmp = os_memdup(buf, len);
785 	if (tmp == NULL)
786 		return -1;
787 	if (supp) {
788 		peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
789 		wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
790 			   MACSTR, MAC2STR(peer->addr));
791 		wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
792 	} else {
793 		if (ibss_rsn_is_auth_started(peer) == 0) {
794 			wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
795 				   "Authenticator dropped as " MACSTR " is not "
796 				   "authenticated", MAC2STR(peer->addr));
797 			os_free(tmp);
798 			return -1;
799 		}
800 
801 		wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
802 			   "from "MACSTR, MAC2STR(peer->addr));
803 		wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
804 	}
805 	os_free(tmp);
806 
807 	return 1;
808 }
809 
810 
ibss_rsn_rx_eapol(struct ibss_rsn * ibss_rsn,const u8 * src_addr,const u8 * buf,size_t len)811 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
812 		      const u8 *buf, size_t len)
813 {
814 	struct ibss_rsn_peer *peer;
815 
816 	if (ibss_rsn == NULL)
817 		return -1;
818 
819 	peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
820 	if (peer)
821 		return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
822 
823 	if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
824 		/*
825 		 * Create new IBSS peer based on an EAPOL message from the peer
826 		 * Authenticator.
827 		 */
828 		peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
829 		if (peer == NULL)
830 			return -1;
831 
832 		/* assume the peer is authenticated already */
833 		wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
834 			   MACSTR, MAC2STR(src_addr));
835 		ibss_rsn_peer_authenticated(ibss_rsn, peer,
836 					    IBSS_RSN_AUTH_EAPOL_BY_US);
837 
838 		return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
839 						 buf, len);
840 	}
841 
842 	return 0;
843 }
844 
ibss_rsn_set_psk(struct ibss_rsn * ibss_rsn,const u8 * psk)845 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
846 {
847 	if (ibss_rsn == NULL)
848 		return;
849 	os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
850 }
851 
852 
ibss_rsn_handle_auth_1_of_2(struct ibss_rsn * ibss_rsn,struct ibss_rsn_peer * peer,const u8 * addr)853 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
854 					struct ibss_rsn_peer *peer,
855 					const u8* addr)
856 {
857 	wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
858 		   MAC2STR(addr));
859 
860 	if (peer &&
861 	    peer->authentication_status & (IBSS_RSN_SET_PTK_SUPP |
862 					   IBSS_RSN_SET_PTK_AUTH)) {
863 		/* Clear the TK for this pair to allow recovery from the case
864 		 * where the peer STA has restarted and lost its key while we
865 		 * still have a pairwise key configured. */
866 		wpa_printf(MSG_DEBUG, "RSN: Clear pairwise key for peer "
867 			   MACSTR, MAC2STR(addr));
868 		wpa_drv_set_key(ibss_rsn->wpa_s, WPA_ALG_NONE, addr, 0, 0,
869 				NULL, 0, NULL, 0, KEY_FLAG_PAIRWISE);
870 	}
871 
872 	if (peer &&
873 	    peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
874 		if (peer->own_auth_tx.sec) {
875 			struct os_reltime now, diff;
876 			os_get_reltime(&now);
877 			os_reltime_sub(&now, &peer->own_auth_tx, &diff);
878 			if (diff.sec == 0 && diff.usec < 500000) {
879 				wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
880 					   (int) diff.usec);
881 				goto skip_reinit;
882 			}
883 		}
884 		/*
885 		 * A peer sent us an Authentication frame even though it already
886 		 * started an EAPOL session. We should reinit state machines
887 		 * here, but it's much more complicated than just deleting and
888 		 * recreating the state machine
889 		 */
890 		wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
891 			   MACSTR, MAC2STR(addr));
892 
893 		ibss_rsn_stop(ibss_rsn, addr);
894 		peer = NULL;
895 	}
896 
897 	if (!peer) {
898 		peer = ibss_rsn_peer_init(ibss_rsn, addr);
899 		if (!peer)
900 			return;
901 
902 		wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
903 			   MAC2STR(addr));
904 	}
905 
906 skip_reinit:
907 	/* reply with an Authentication frame now, before sending an EAPOL */
908 	ibss_rsn_send_auth(ibss_rsn, addr, 2);
909 	/* no need to start another AUTH challenge in the other way.. */
910 	ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
911 }
912 
913 
ibss_rsn_handle_auth(struct ibss_rsn * ibss_rsn,const u8 * auth_frame,size_t len)914 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
915 			  size_t len)
916 {
917 	const struct ieee80211_mgmt *header;
918 	struct ibss_rsn_peer *peer;
919 	size_t auth_length;
920 
921 	header = (const struct ieee80211_mgmt *) auth_frame;
922 	auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
923 
924 	if (ibss_rsn == NULL || len < auth_length)
925 		return;
926 
927 	if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
928 	    le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
929 		return;
930 
931 	peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
932 
933 	switch (le_to_host16(header->u.auth.auth_transaction)) {
934 	case 1:
935 		ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
936 		break;
937 	case 2:
938 		wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
939 			   MACSTR, MAC2STR(header->sa));
940 		if (!peer) {
941 			wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
942 				   "unknown STA " MACSTR, MAC2STR(header->sa));
943 			break;
944 		}
945 
946 		/* authentication has been completed */
947 		eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
948 		wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
949 			   MAC2STR(header->sa));
950 		ibss_rsn_peer_authenticated(ibss_rsn, peer,
951 					    IBSS_RSN_AUTH_BY_US);
952 		break;
953 	}
954 }
955