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1 /*
2  * Wi-Fi Protected Setup - Registrar
3  * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  *
9  * Alternatively, this software may be distributed under the terms of BSD
10  * license.
11  *
12  * See README and COPYING for more details.
13  */
14 
15 #include "includes.h"
16 
17 #include "common.h"
18 #include "crypto/sha256.h"
19 #include "base64.h"
20 #include "ieee802_11_defs.h"
21 #include "eloop.h"
22 #include "wps_i.h"
23 #include "wps_dev_attr.h"
24 #include "wps_upnp.h"
25 
26 #define WPS_WORKAROUNDS
27 
28 struct wps_uuid_pin {
29 	struct wps_uuid_pin *next;
30 	u8 uuid[WPS_UUID_LEN];
31 	int wildcard_uuid;
32 	u8 *pin;
33 	size_t pin_len;
34 #define PIN_LOCKED BIT(0)
35 #define PIN_EXPIRES BIT(1)
36 	int flags;
37 	struct os_time expiration;
38 };
39 
40 
wps_free_pin(struct wps_uuid_pin * pin)41 static void wps_free_pin(struct wps_uuid_pin *pin)
42 {
43 	os_free(pin->pin);
44 	os_free(pin);
45 }
46 
47 
wps_free_pins(struct wps_uuid_pin * pins)48 static void wps_free_pins(struct wps_uuid_pin *pins)
49 {
50 	struct wps_uuid_pin *pin, *prev;
51 
52 	pin = pins;
53 	while (pin) {
54 		prev = pin;
55 		pin = pin->next;
56 		wps_free_pin(prev);
57 	}
58 }
59 
60 
61 struct wps_pbc_session {
62 	struct wps_pbc_session *next;
63 	u8 addr[ETH_ALEN];
64 	u8 uuid_e[WPS_UUID_LEN];
65 	struct os_time timestamp;
66 };
67 
68 
wps_free_pbc_sessions(struct wps_pbc_session * pbc)69 static void wps_free_pbc_sessions(struct wps_pbc_session *pbc)
70 {
71 	struct wps_pbc_session *prev;
72 
73 	while (pbc) {
74 		prev = pbc;
75 		pbc = pbc->next;
76 		os_free(prev);
77 	}
78 }
79 
80 
81 struct wps_registrar {
82 	struct wps_context *wps;
83 
84 	int pbc;
85 	int selected_registrar;
86 
87 	int (*new_psk_cb)(void *ctx, const u8 *mac_addr, const u8 *psk,
88 			  size_t psk_len);
89 	int (*set_ie_cb)(void *ctx, const u8 *beacon_ie, size_t beacon_ie_len,
90 			 const u8 *probe_resp_ie, size_t probe_resp_ie_len);
91 	void (*pin_needed_cb)(void *ctx, const u8 *uuid_e,
92 			      const struct wps_device_data *dev);
93 	void (*reg_success_cb)(void *ctx, const u8 *mac_addr,
94 			       const u8 *uuid_e);
95 	void *cb_ctx;
96 
97 	struct wps_uuid_pin *pins;
98 	struct wps_pbc_session *pbc_sessions;
99 
100 	int skip_cred_build;
101 	struct wpabuf *extra_cred;
102 	int disable_auto_conf;
103 	int sel_reg_dev_password_id_override;
104 	int sel_reg_config_methods_override;
105 	int static_wep_only;
106 
107 	int force_pbc_overlap;
108 };
109 
110 
111 static int wps_set_ie(struct wps_registrar *reg);
112 static void wps_registrar_pbc_timeout(void *eloop_ctx, void *timeout_ctx);
113 static void wps_registrar_set_selected_timeout(void *eloop_ctx,
114 					       void *timeout_ctx);
115 
116 
wps_registrar_add_pbc_session(struct wps_registrar * reg,const u8 * addr,const u8 * uuid_e)117 static void wps_registrar_add_pbc_session(struct wps_registrar *reg,
118 					  const u8 *addr, const u8 *uuid_e)
119 {
120 	struct wps_pbc_session *pbc, *prev = NULL;
121 	struct os_time now;
122 
123 	os_get_time(&now);
124 
125 	pbc = reg->pbc_sessions;
126 	while (pbc) {
127 		if (os_memcmp(pbc->addr, addr, ETH_ALEN) == 0 &&
128 		    os_memcmp(pbc->uuid_e, uuid_e, WPS_UUID_LEN) == 0) {
129 			if (prev)
130 				prev->next = pbc->next;
131 			else
132 				reg->pbc_sessions = pbc->next;
133 			break;
134 		}
135 		prev = pbc;
136 		pbc = pbc->next;
137 	}
138 
139 	if (!pbc) {
140 		pbc = os_zalloc(sizeof(*pbc));
141 		if (pbc == NULL)
142 			return;
143 		os_memcpy(pbc->addr, addr, ETH_ALEN);
144 		if (uuid_e)
145 			os_memcpy(pbc->uuid_e, uuid_e, WPS_UUID_LEN);
146 	}
147 
148 	pbc->next = reg->pbc_sessions;
149 	reg->pbc_sessions = pbc;
150 	pbc->timestamp = now;
151 
152 	/* remove entries that have timed out */
153 	prev = pbc;
154 	pbc = pbc->next;
155 
156 	while (pbc) {
157 		if (now.sec > pbc->timestamp.sec + WPS_PBC_WALK_TIME) {
158 			prev->next = NULL;
159 			wps_free_pbc_sessions(pbc);
160 			break;
161 		}
162 		prev = pbc;
163 		pbc = pbc->next;
164 	}
165 }
166 
167 
wps_registrar_remove_pbc_session(struct wps_registrar * reg,const u8 * addr,const u8 * uuid_e)168 static void wps_registrar_remove_pbc_session(struct wps_registrar *reg,
169 					     const u8 *addr, const u8 *uuid_e)
170 {
171 	struct wps_pbc_session *pbc, *prev = NULL;
172 
173 	pbc = reg->pbc_sessions;
174 	while (pbc) {
175 		if (os_memcmp(pbc->addr, addr, ETH_ALEN) == 0 &&
176 		    os_memcmp(pbc->uuid_e, uuid_e, WPS_UUID_LEN) == 0) {
177 			if (prev)
178 				prev->next = pbc->next;
179 			else
180 				reg->pbc_sessions = pbc->next;
181 			os_free(pbc);
182 			break;
183 		}
184 		prev = pbc;
185 		pbc = pbc->next;
186 	}
187 }
188 
189 
wps_registrar_pbc_overlap(struct wps_registrar * reg,const u8 * addr,const u8 * uuid_e)190 static int wps_registrar_pbc_overlap(struct wps_registrar *reg,
191 				     const u8 *addr, const u8 *uuid_e)
192 {
193 	int count = 0;
194 	struct wps_pbc_session *pbc;
195 	struct os_time now;
196 
197 	os_get_time(&now);
198 
199 	for (pbc = reg->pbc_sessions; pbc; pbc = pbc->next) {
200 		if (now.sec > pbc->timestamp.sec + WPS_PBC_WALK_TIME)
201 			break;
202 		if (addr == NULL || os_memcmp(addr, pbc->addr, ETH_ALEN) ||
203 		    uuid_e == NULL ||
204 		    os_memcmp(uuid_e, pbc->uuid_e, WPS_UUID_LEN))
205 			count++;
206 	}
207 
208 	if (addr || uuid_e)
209 		count++;
210 
211 	return count > 1 ? 1 : 0;
212 }
213 
214 
wps_build_wps_state(struct wps_context * wps,struct wpabuf * msg)215 static int wps_build_wps_state(struct wps_context *wps, struct wpabuf *msg)
216 {
217 	wpa_printf(MSG_DEBUG, "WPS:  * Wi-Fi Protected Setup State (%d)",
218 		   wps->wps_state);
219 	wpabuf_put_be16(msg, ATTR_WPS_STATE);
220 	wpabuf_put_be16(msg, 1);
221 	wpabuf_put_u8(msg, wps->wps_state);
222 	return 0;
223 }
224 
225 
226 #ifdef CONFIG_WPS_UPNP
wps_registrar_free_pending_m2(struct wps_context * wps)227 static void wps_registrar_free_pending_m2(struct wps_context *wps)
228 {
229 	struct upnp_pending_message *p, *p2, *prev = NULL;
230 	p = wps->upnp_msgs;
231 	while (p) {
232 		if (p->type == WPS_M2 || p->type == WPS_M2D) {
233 			if (prev == NULL)
234 				wps->upnp_msgs = p->next;
235 			else
236 				prev->next = p->next;
237 			wpa_printf(MSG_DEBUG, "WPS UPnP: Drop pending M2/M2D");
238 			p2 = p;
239 			p = p->next;
240 			wpabuf_free(p2->msg);
241 			os_free(p2);
242 			continue;
243 		}
244 		prev = p;
245 		p = p->next;
246 	}
247 }
248 #endif /* CONFIG_WPS_UPNP */
249 
250 
wps_build_ap_setup_locked(struct wps_context * wps,struct wpabuf * msg)251 static int wps_build_ap_setup_locked(struct wps_context *wps,
252 				     struct wpabuf *msg)
253 {
254 	if (wps->ap_setup_locked) {
255 		wpa_printf(MSG_DEBUG, "WPS:  * AP Setup Locked");
256 		wpabuf_put_be16(msg, ATTR_AP_SETUP_LOCKED);
257 		wpabuf_put_be16(msg, 1);
258 		wpabuf_put_u8(msg, 1);
259 	}
260 	return 0;
261 }
262 
263 
wps_build_selected_registrar(struct wps_registrar * reg,struct wpabuf * msg)264 static int wps_build_selected_registrar(struct wps_registrar *reg,
265 					struct wpabuf *msg)
266 {
267 	if (!reg->selected_registrar)
268 		return 0;
269 	wpa_printf(MSG_DEBUG, "WPS:  * Selected Registrar");
270 	wpabuf_put_be16(msg, ATTR_SELECTED_REGISTRAR);
271 	wpabuf_put_be16(msg, 1);
272 	wpabuf_put_u8(msg, 1);
273 	return 0;
274 }
275 
276 
wps_build_sel_reg_dev_password_id(struct wps_registrar * reg,struct wpabuf * msg)277 static int wps_build_sel_reg_dev_password_id(struct wps_registrar *reg,
278 					     struct wpabuf *msg)
279 {
280 	u16 id = reg->pbc ? DEV_PW_PUSHBUTTON : DEV_PW_DEFAULT;
281 	if (!reg->selected_registrar)
282 		return 0;
283 	if (reg->sel_reg_dev_password_id_override >= 0)
284 		id = reg->sel_reg_dev_password_id_override;
285 	wpa_printf(MSG_DEBUG, "WPS:  * Device Password ID (%d)", id);
286 	wpabuf_put_be16(msg, ATTR_DEV_PASSWORD_ID);
287 	wpabuf_put_be16(msg, 2);
288 	wpabuf_put_be16(msg, id);
289 	return 0;
290 }
291 
292 
wps_build_sel_reg_config_methods(struct wps_registrar * reg,struct wpabuf * msg)293 static int wps_build_sel_reg_config_methods(struct wps_registrar *reg,
294 					    struct wpabuf *msg)
295 {
296 	u16 methods;
297 	if (!reg->selected_registrar)
298 		return 0;
299 	methods = reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
300 	if (reg->pbc)
301 		methods |= WPS_CONFIG_PUSHBUTTON;
302 	if (reg->sel_reg_config_methods_override >= 0)
303 		methods = reg->sel_reg_config_methods_override;
304 	wpa_printf(MSG_DEBUG, "WPS:  * Selected Registrar Config Methods (%x)",
305 		   methods);
306 	wpabuf_put_be16(msg, ATTR_SELECTED_REGISTRAR_CONFIG_METHODS);
307 	wpabuf_put_be16(msg, 2);
308 	wpabuf_put_be16(msg, methods);
309 	return 0;
310 }
311 
312 
wps_build_probe_config_methods(struct wps_registrar * reg,struct wpabuf * msg)313 static int wps_build_probe_config_methods(struct wps_registrar *reg,
314 					  struct wpabuf *msg)
315 {
316 	u16 methods;
317 	methods = 0;
318 	wpa_printf(MSG_DEBUG, "WPS:  * Config Methods (%x)", methods);
319 	wpabuf_put_be16(msg, ATTR_CONFIG_METHODS);
320 	wpabuf_put_be16(msg, 2);
321 	wpabuf_put_be16(msg, methods);
322 	return 0;
323 }
324 
325 
wps_build_config_methods_r(struct wps_registrar * reg,struct wpabuf * msg)326 static int wps_build_config_methods_r(struct wps_registrar *reg,
327 				      struct wpabuf *msg)
328 {
329 	u16 methods;
330 	methods = reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
331 	if (reg->pbc)
332 		methods |= WPS_CONFIG_PUSHBUTTON;
333 	return wps_build_config_methods(msg, methods);
334 }
335 
336 
wps_build_resp_type(struct wps_registrar * reg,struct wpabuf * msg)337 static int wps_build_resp_type(struct wps_registrar *reg, struct wpabuf *msg)
338 {
339 	u8 resp = reg->wps->ap ? WPS_RESP_AP : WPS_RESP_REGISTRAR;
340 	wpa_printf(MSG_DEBUG, "WPS:  * Response Type (%d)", resp);
341 	wpabuf_put_be16(msg, ATTR_RESPONSE_TYPE);
342 	wpabuf_put_be16(msg, 1);
343 	wpabuf_put_u8(msg, resp);
344 	return 0;
345 }
346 
347 
348 /**
349  * wps_registrar_init - Initialize WPS Registrar data
350  * @wps: Pointer to longterm WPS context
351  * @cfg: Registrar configuration
352  * Returns: Pointer to allocated Registrar data or %NULL on failure
353  *
354  * This function is used to initialize WPS Registrar functionality. It can be
355  * used for a single Registrar run (e.g., when run in a supplicant) or multiple
356  * runs (e.g., when run as an internal Registrar in an AP). Caller is
357  * responsible for freeing the returned data with wps_registrar_deinit() when
358  * Registrar functionality is not needed anymore.
359  */
360 struct wps_registrar *
wps_registrar_init(struct wps_context * wps,const struct wps_registrar_config * cfg)361 wps_registrar_init(struct wps_context *wps,
362 		   const struct wps_registrar_config *cfg)
363 {
364 	struct wps_registrar *reg = os_zalloc(sizeof(*reg));
365 	if (reg == NULL)
366 		return NULL;
367 
368 	reg->wps = wps;
369 	reg->new_psk_cb = cfg->new_psk_cb;
370 	reg->set_ie_cb = cfg->set_ie_cb;
371 	reg->pin_needed_cb = cfg->pin_needed_cb;
372 	reg->reg_success_cb = cfg->reg_success_cb;
373 	reg->cb_ctx = cfg->cb_ctx;
374 	reg->skip_cred_build = cfg->skip_cred_build;
375 	if (cfg->extra_cred) {
376 		reg->extra_cred = wpabuf_alloc_copy(cfg->extra_cred,
377 						    cfg->extra_cred_len);
378 		if (reg->extra_cred == NULL) {
379 			os_free(reg);
380 			return NULL;
381 		}
382 	}
383 	reg->disable_auto_conf = cfg->disable_auto_conf;
384 	reg->sel_reg_dev_password_id_override = -1;
385 	reg->sel_reg_config_methods_override = -1;
386 	reg->static_wep_only = cfg->static_wep_only;
387 
388 	if (wps_set_ie(reg)) {
389 		wps_registrar_deinit(reg);
390 		return NULL;
391 	}
392 
393 	return reg;
394 }
395 
396 
397 /**
398  * wps_registrar_deinit - Deinitialize WPS Registrar data
399  * @reg: Registrar data from wps_registrar_init()
400  */
wps_registrar_deinit(struct wps_registrar * reg)401 void wps_registrar_deinit(struct wps_registrar *reg)
402 {
403 	if (reg == NULL)
404 		return;
405 	eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
406 	eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg, NULL);
407 	wps_free_pins(reg->pins);
408 	wps_free_pbc_sessions(reg->pbc_sessions);
409 	wpabuf_free(reg->extra_cred);
410 	os_free(reg);
411 }
412 
413 
414 /**
415  * wps_registrar_add_pin - Configure a new PIN for Registrar
416  * @reg: Registrar data from wps_registrar_init()
417  * @uuid: UUID-E or %NULL for wildcard (any UUID)
418  * @pin: PIN (Device Password)
419  * @pin_len: Length of pin in octets
420  * @timeout: Time (in seconds) when the PIN will be invalidated; 0 = no timeout
421  * Returns: 0 on success, -1 on failure
422  */
wps_registrar_add_pin(struct wps_registrar * reg,const u8 * uuid,const u8 * pin,size_t pin_len,int timeout)423 int wps_registrar_add_pin(struct wps_registrar *reg, const u8 *uuid,
424 			  const u8 *pin, size_t pin_len, int timeout)
425 {
426 	struct wps_uuid_pin *p;
427 
428 	p = os_zalloc(sizeof(*p));
429 	if (p == NULL)
430 		return -1;
431 	if (uuid == NULL)
432 		p->wildcard_uuid = 1;
433 	else
434 		os_memcpy(p->uuid, uuid, WPS_UUID_LEN);
435 	p->pin = os_malloc(pin_len);
436 	if (p->pin == NULL) {
437 		os_free(p);
438 		return -1;
439 	}
440 	os_memcpy(p->pin, pin, pin_len);
441 	p->pin_len = pin_len;
442 
443 	if (timeout) {
444 		p->flags |= PIN_EXPIRES;
445 		os_get_time(&p->expiration);
446 		p->expiration.sec += timeout;
447 	}
448 
449 	p->next = reg->pins;
450 	reg->pins = p;
451 
452 	wpa_printf(MSG_DEBUG, "WPS: A new PIN configured (timeout=%d)",
453 		   timeout);
454 	wpa_hexdump(MSG_DEBUG, "WPS: UUID", uuid, WPS_UUID_LEN);
455 	wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: PIN", pin, pin_len);
456 	reg->selected_registrar = 1;
457 	reg->pbc = 0;
458 	wps_set_ie(reg);
459 	eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg, NULL);
460 	eloop_register_timeout(WPS_PBC_WALK_TIME, 0,
461 			       wps_registrar_set_selected_timeout,
462 			       reg, NULL);
463 
464 	return 0;
465 }
466 
467 
wps_registrar_expire_pins(struct wps_registrar * reg)468 static void wps_registrar_expire_pins(struct wps_registrar *reg)
469 {
470 	struct wps_uuid_pin *pin, *prev, *del;
471 	struct os_time now;
472 
473 	os_get_time(&now);
474 	prev = NULL;
475 	pin = reg->pins;
476 	while (pin) {
477 		if ((pin->flags & PIN_EXPIRES) &&
478 		    os_time_before(&pin->expiration, &now)) {
479 			if (prev == NULL)
480 				reg->pins = pin->next;
481 			else
482 				prev->next = pin->next;
483 			del = pin;
484 			pin = pin->next;
485 			wpa_hexdump(MSG_DEBUG, "WPS: Expired PIN for UUID",
486 				    del->uuid, WPS_UUID_LEN);
487 			wps_free_pin(del);
488 			continue;
489 		}
490 		prev = pin;
491 		pin = pin->next;
492 	}
493 }
494 
495 
496 /**
497  * wps_registrar_invalidate_pin - Invalidate a PIN for a specific UUID-E
498  * @reg: Registrar data from wps_registrar_init()
499  * @uuid: UUID-E
500  * Returns: 0 on success, -1 on failure (e.g., PIN not found)
501  */
wps_registrar_invalidate_pin(struct wps_registrar * reg,const u8 * uuid)502 int wps_registrar_invalidate_pin(struct wps_registrar *reg, const u8 *uuid)
503 {
504 	struct wps_uuid_pin *pin, *prev;
505 
506 	prev = NULL;
507 	pin = reg->pins;
508 	while (pin) {
509 		if (os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0) {
510 			if (prev == NULL)
511 				reg->pins = pin->next;
512 			else
513 				prev->next = pin->next;
514 			wpa_hexdump(MSG_DEBUG, "WPS: Invalidated PIN for UUID",
515 				    pin->uuid, WPS_UUID_LEN);
516 			wps_free_pin(pin);
517 			return 0;
518 		}
519 		prev = pin;
520 		pin = pin->next;
521 	}
522 
523 	return -1;
524 }
525 
526 
wps_registrar_get_pin(struct wps_registrar * reg,const u8 * uuid,size_t * pin_len)527 static const u8 * wps_registrar_get_pin(struct wps_registrar *reg,
528 					const u8 *uuid, size_t *pin_len)
529 {
530 	struct wps_uuid_pin *pin;
531 
532 	wps_registrar_expire_pins(reg);
533 
534 	pin = reg->pins;
535 	while (pin) {
536 		if (!pin->wildcard_uuid &&
537 		    os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0)
538 			break;
539 		pin = pin->next;
540 	}
541 
542 	if (!pin) {
543 		/* Check for wildcard UUIDs since none of the UUID-specific
544 		 * PINs matched */
545 		pin = reg->pins;
546 		while (pin) {
547 			if (pin->wildcard_uuid == 1) {
548 				wpa_printf(MSG_DEBUG, "WPS: Found a wildcard "
549 					   "PIN. Assigned it for this UUID-E");
550 				pin->wildcard_uuid = 2;
551 				os_memcpy(pin->uuid, uuid, WPS_UUID_LEN);
552 				break;
553 			}
554 			pin = pin->next;
555 		}
556 	}
557 
558 	if (!pin)
559 		return NULL;
560 
561 	/*
562 	 * Lock the PIN to avoid attacks based on concurrent re-use of the PIN
563 	 * that could otherwise avoid PIN invalidations.
564 	 */
565 	if (pin->flags & PIN_LOCKED) {
566 		wpa_printf(MSG_DEBUG, "WPS: Selected PIN locked - do not "
567 			   "allow concurrent re-use");
568 		return NULL;
569 	}
570 	*pin_len = pin->pin_len;
571 	pin->flags |= PIN_LOCKED;
572 	return pin->pin;
573 }
574 
575 
576 /**
577  * wps_registrar_unlock_pin - Unlock a PIN for a specific UUID-E
578  * @reg: Registrar data from wps_registrar_init()
579  * @uuid: UUID-E
580  * Returns: 0 on success, -1 on failure
581  *
582  * PINs are locked to enforce only one concurrent use. This function unlocks a
583  * PIN to allow it to be used again. If the specified PIN was configured using
584  * a wildcard UUID, it will be removed instead of allowing multiple uses.
585  */
wps_registrar_unlock_pin(struct wps_registrar * reg,const u8 * uuid)586 int wps_registrar_unlock_pin(struct wps_registrar *reg, const u8 *uuid)
587 {
588 	struct wps_uuid_pin *pin;
589 
590 	pin = reg->pins;
591 	while (pin) {
592 		if (os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0) {
593 			if (pin->wildcard_uuid == 2) {
594 				wpa_printf(MSG_DEBUG, "WPS: Invalidating used "
595 					   "wildcard PIN");
596 				return wps_registrar_invalidate_pin(reg, uuid);
597 			}
598 			pin->flags &= ~PIN_LOCKED;
599 			return 0;
600 		}
601 		pin = pin->next;
602 	}
603 
604 	return -1;
605 }
606 
607 
wps_registrar_stop_pbc(struct wps_registrar * reg)608 static void wps_registrar_stop_pbc(struct wps_registrar *reg)
609 {
610 	reg->selected_registrar = 0;
611 	reg->pbc = 0;
612 	wps_set_ie(reg);
613 }
614 
615 
wps_registrar_pbc_timeout(void * eloop_ctx,void * timeout_ctx)616 static void wps_registrar_pbc_timeout(void *eloop_ctx, void *timeout_ctx)
617 {
618 	struct wps_registrar *reg = eloop_ctx;
619 
620 	wpa_printf(MSG_DEBUG, "WPS: PBC timed out - disable PBC mode");
621 	wps_pbc_timeout_event(reg->wps);
622 	wps_registrar_stop_pbc(reg);
623 }
624 
625 
626 /**
627  * wps_registrar_button_pushed - Notify Registrar that AP button was pushed
628  * @reg: Registrar data from wps_registrar_init()
629  * Returns: 0 on success, -1 on failure
630  *
631  * This function is called on an AP when a push button is pushed to activate
632  * PBC mode. The PBC mode will be stopped after walk time (2 minutes) timeout
633  * or when a PBC registration is completed.
634  */
wps_registrar_button_pushed(struct wps_registrar * reg)635 int wps_registrar_button_pushed(struct wps_registrar *reg)
636 {
637 	if (wps_registrar_pbc_overlap(reg, NULL, NULL)) {
638 		wpa_printf(MSG_DEBUG, "WPS: PBC overlap - do not start PBC "
639 			   "mode");
640 		wps_pbc_overlap_event(reg->wps);
641 		return -1;
642 	}
643 	wpa_printf(MSG_DEBUG, "WPS: Button pushed - PBC mode started");
644 	reg->force_pbc_overlap = 0;
645 	reg->selected_registrar = 1;
646 	reg->pbc = 1;
647 	wps_set_ie(reg);
648 
649 	eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
650 	eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wps_registrar_pbc_timeout,
651 			       reg, NULL);
652 	return 0;
653 }
654 
655 
wps_registrar_pbc_completed(struct wps_registrar * reg)656 static void wps_registrar_pbc_completed(struct wps_registrar *reg)
657 {
658 	wpa_printf(MSG_DEBUG, "WPS: PBC completed - stopping PBC mode");
659 	eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
660 	wps_registrar_stop_pbc(reg);
661 }
662 
wps_registrar_pin_completed(struct wps_registrar * reg)663 static void wps_registrar_pin_completed(struct wps_registrar *reg)
664 {
665 	wpa_printf(MSG_DEBUG, "WPS: PIN completed using internal Registrar");
666 	eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg, NULL);
667 	reg->selected_registrar = 0;
668 	wps_set_ie(reg);
669 }
670 
671 
672 /**
673  * wps_registrar_probe_req_rx - Notify Registrar of Probe Request
674  * @reg: Registrar data from wps_registrar_init()
675  * @addr: MAC address of the Probe Request sender
676  * @wps_data: WPS IE contents
677  *
678  * This function is called on an AP when a Probe Request with WPS IE is
679  * received. This is used to track PBC mode use and to detect possible overlap
680  * situation with other WPS APs.
681  */
wps_registrar_probe_req_rx(struct wps_registrar * reg,const u8 * addr,const struct wpabuf * wps_data)682 void wps_registrar_probe_req_rx(struct wps_registrar *reg, const u8 *addr,
683 				const struct wpabuf *wps_data)
684 {
685 	struct wps_parse_attr attr;
686 	u16 methods;
687 
688 	wpa_hexdump_buf(MSG_MSGDUMP,
689 			"WPS: Probe Request with WPS data received",
690 			wps_data);
691 
692 	if (wps_parse_msg(wps_data, &attr) < 0)
693 		return;
694 	if (!wps_version_supported(attr.version)) {
695 		wpa_printf(MSG_DEBUG, "WPS: Unsupported ProbeReq WPS IE "
696 			   "version 0x%x", attr.version ? *attr.version : 0);
697 		return;
698 	}
699 
700 	if (attr.config_methods == NULL) {
701 		wpa_printf(MSG_DEBUG, "WPS: No Config Methods attribute in "
702 			   "Probe Request");
703 		return;
704 	}
705 
706 	methods = WPA_GET_BE16(attr.config_methods);
707 	if (!(methods & WPS_CONFIG_PUSHBUTTON))
708 		return; /* Not PBC */
709 
710 	wpa_printf(MSG_DEBUG, "WPS: Probe Request for PBC received from "
711 		   MACSTR, MAC2STR(addr));
712 	if (attr.uuid_e == NULL) {
713 		wpa_printf(MSG_DEBUG, "WPS: Invalid Probe Request WPS IE: No "
714 			   "UUID-E included");
715 		return;
716 	}
717 
718 	wps_registrar_add_pbc_session(reg, addr, attr.uuid_e);
719 	if (wps_registrar_pbc_overlap(reg, addr, attr.uuid_e)) {
720 		wpa_printf(MSG_DEBUG, "WPS: PBC session overlap detected");
721 		reg->force_pbc_overlap = 1;
722 		wps_pbc_overlap_event(reg->wps);
723 	}
724 }
725 
726 
wps_cb_new_psk(struct wps_registrar * reg,const u8 * mac_addr,const u8 * psk,size_t psk_len)727 static int wps_cb_new_psk(struct wps_registrar *reg, const u8 *mac_addr,
728 			  const u8 *psk, size_t psk_len)
729 {
730 	if (reg->new_psk_cb == NULL)
731 		return 0;
732 
733 	return reg->new_psk_cb(reg->cb_ctx, mac_addr, psk, psk_len);
734 }
735 
736 
wps_cb_pin_needed(struct wps_registrar * reg,const u8 * uuid_e,const struct wps_device_data * dev)737 static void wps_cb_pin_needed(struct wps_registrar *reg, const u8 *uuid_e,
738 			      const struct wps_device_data *dev)
739 {
740 	if (reg->pin_needed_cb == NULL)
741 		return;
742 
743 	reg->pin_needed_cb(reg->cb_ctx, uuid_e, dev);
744 }
745 
746 
wps_cb_reg_success(struct wps_registrar * reg,const u8 * mac_addr,const u8 * uuid_e)747 static void wps_cb_reg_success(struct wps_registrar *reg, const u8 *mac_addr,
748 			       const u8 *uuid_e)
749 {
750 	if (reg->reg_success_cb == NULL)
751 		return;
752 
753 	reg->reg_success_cb(reg->cb_ctx, mac_addr, uuid_e);
754 }
755 
756 
wps_cb_set_ie(struct wps_registrar * reg,const struct wpabuf * beacon_ie,const struct wpabuf * probe_resp_ie)757 static int wps_cb_set_ie(struct wps_registrar *reg,
758 			 const struct wpabuf *beacon_ie,
759 			 const struct wpabuf *probe_resp_ie)
760 {
761 	if (reg->set_ie_cb == NULL)
762 		return 0;
763 
764 	return reg->set_ie_cb(reg->cb_ctx, wpabuf_head(beacon_ie),
765 			      wpabuf_len(beacon_ie),
766 			      wpabuf_head(probe_resp_ie),
767 			      wpabuf_len(probe_resp_ie));
768 }
769 
770 
771 /* Encapsulate WPS IE data with one (or more, if needed) IE headers */
wps_ie_encapsulate(struct wpabuf * data)772 static struct wpabuf * wps_ie_encapsulate(struct wpabuf *data)
773 {
774 	struct wpabuf *ie;
775 	const u8 *pos, *end;
776 
777 	ie = wpabuf_alloc(wpabuf_len(data) + 100);
778 	if (ie == NULL) {
779 		wpabuf_free(data);
780 		return NULL;
781 	}
782 
783 	pos = wpabuf_head(data);
784 	end = pos + wpabuf_len(data);
785 
786 	while (end > pos) {
787 		size_t frag_len = end - pos;
788 		if (frag_len > 251)
789 			frag_len = 251;
790 		wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
791 		wpabuf_put_u8(ie, 4 + frag_len);
792 		wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
793 		wpabuf_put_data(ie, pos, frag_len);
794 		pos += frag_len;
795 	}
796 
797 	wpabuf_free(data);
798 
799 	return ie;
800 }
801 
802 
wps_set_ie(struct wps_registrar * reg)803 static int wps_set_ie(struct wps_registrar *reg)
804 {
805 	struct wpabuf *beacon;
806 	struct wpabuf *probe;
807 	int ret;
808 
809 	wpa_printf(MSG_DEBUG, "WPS: Build Beacon and Probe Response IEs");
810 
811 	beacon = wpabuf_alloc(300);
812 	if (beacon == NULL)
813 		return -1;
814 	probe = wpabuf_alloc(400);
815 	if (probe == NULL) {
816 		wpabuf_free(beacon);
817 		return -1;
818 	}
819 
820 	if (wps_build_version(beacon) ||
821 	    wps_build_wps_state(reg->wps, beacon) ||
822 	    wps_build_ap_setup_locked(reg->wps, beacon) ||
823 	    wps_build_selected_registrar(reg, beacon) ||
824 	    wps_build_sel_reg_dev_password_id(reg, beacon) ||
825 	    wps_build_sel_reg_config_methods(reg, beacon) ||
826 	    wps_build_version(probe) ||
827 	    wps_build_wps_state(reg->wps, probe) ||
828 	    wps_build_ap_setup_locked(reg->wps, probe) ||
829 	    wps_build_selected_registrar(reg, probe) ||
830 	    wps_build_sel_reg_dev_password_id(reg, probe) ||
831 	    wps_build_sel_reg_config_methods(reg, probe) ||
832 	    wps_build_resp_type(reg, probe) ||
833 	    wps_build_uuid_e(probe, reg->wps->uuid) ||
834 	    wps_build_device_attrs(&reg->wps->dev, probe) ||
835 	    wps_build_probe_config_methods(reg, probe) ||
836 	    wps_build_rf_bands(&reg->wps->dev, probe)) {
837 		wpabuf_free(beacon);
838 		wpabuf_free(probe);
839 		return -1;
840 	}
841 
842 	beacon = wps_ie_encapsulate(beacon);
843 	probe = wps_ie_encapsulate(probe);
844 
845 	if (!beacon || !probe) {
846 		wpabuf_free(beacon);
847 		wpabuf_free(probe);
848 		return -1;
849 	}
850 
851 	if (reg->static_wep_only) {
852 		/*
853 		 * Windows XP and Vista clients can get confused about
854 		 * EAP-Identity/Request when they probe the network with
855 		 * EAPOL-Start. In such a case, they may assume the network is
856 		 * using IEEE 802.1X and prompt user for a certificate while
857 		 * the correct (non-WPS) behavior would be to ask for the
858 		 * static WEP key. As a workaround, use Microsoft Provisioning
859 		 * IE to advertise that legacy 802.1X is not supported.
860 		 */
861 		const u8 ms_wps[7] = {
862 			WLAN_EID_VENDOR_SPECIFIC, 5,
863 			/* Microsoft Provisioning IE (00:50:f2:5) */
864 			0x00, 0x50, 0xf2, 5,
865 			0x00 /* no legacy 802.1X or MS WPS */
866 		};
867 		wpa_printf(MSG_DEBUG, "WPS: Add Microsoft Provisioning IE "
868 			   "into Beacon/Probe Response frames");
869 		wpabuf_put_data(beacon, ms_wps, sizeof(ms_wps));
870 		wpabuf_put_data(probe, ms_wps, sizeof(ms_wps));
871 	}
872 
873 	ret = wps_cb_set_ie(reg, beacon, probe);
874 	wpabuf_free(beacon);
875 	wpabuf_free(probe);
876 
877 	return ret;
878 }
879 
880 
wps_get_dev_password(struct wps_data * wps)881 static int wps_get_dev_password(struct wps_data *wps)
882 {
883 	const u8 *pin;
884 	size_t pin_len = 0;
885 
886 	os_free(wps->dev_password);
887 	wps->dev_password = NULL;
888 
889 	if (wps->pbc) {
890 		wpa_printf(MSG_DEBUG, "WPS: Use default PIN for PBC");
891 		pin = (const u8 *) "00000000";
892 		pin_len = 8;
893 	} else {
894 		pin = wps_registrar_get_pin(wps->wps->registrar, wps->uuid_e,
895 					    &pin_len);
896 	}
897 	if (pin == NULL) {
898 		wpa_printf(MSG_DEBUG, "WPS: No Device Password available for "
899 			   "the Enrollee");
900 		wps_cb_pin_needed(wps->wps->registrar, wps->uuid_e,
901 				  &wps->peer_dev);
902 		return -1;
903 	}
904 
905 	wps->dev_password = os_malloc(pin_len);
906 	if (wps->dev_password == NULL)
907 		return -1;
908 	os_memcpy(wps->dev_password, pin, pin_len);
909 	wps->dev_password_len = pin_len;
910 
911 	return 0;
912 }
913 
914 
wps_build_uuid_r(struct wps_data * wps,struct wpabuf * msg)915 static int wps_build_uuid_r(struct wps_data *wps, struct wpabuf *msg)
916 {
917 	wpa_printf(MSG_DEBUG, "WPS:  * UUID-R");
918 	wpabuf_put_be16(msg, ATTR_UUID_R);
919 	wpabuf_put_be16(msg, WPS_UUID_LEN);
920 	wpabuf_put_data(msg, wps->uuid_r, WPS_UUID_LEN);
921 	return 0;
922 }
923 
924 
wps_build_r_hash(struct wps_data * wps,struct wpabuf * msg)925 static int wps_build_r_hash(struct wps_data *wps, struct wpabuf *msg)
926 {
927 	u8 *hash;
928 	const u8 *addr[4];
929 	size_t len[4];
930 
931 	if (os_get_random(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0)
932 		return -1;
933 	wpa_hexdump(MSG_DEBUG, "WPS: R-S1", wps->snonce, WPS_SECRET_NONCE_LEN);
934 	wpa_hexdump(MSG_DEBUG, "WPS: R-S2",
935 		    wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN);
936 
937 	if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) {
938 		wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for "
939 			   "R-Hash derivation");
940 		return -1;
941 	}
942 
943 	wpa_printf(MSG_DEBUG, "WPS:  * R-Hash1");
944 	wpabuf_put_be16(msg, ATTR_R_HASH1);
945 	wpabuf_put_be16(msg, SHA256_MAC_LEN);
946 	hash = wpabuf_put(msg, SHA256_MAC_LEN);
947 	/* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
948 	addr[0] = wps->snonce;
949 	len[0] = WPS_SECRET_NONCE_LEN;
950 	addr[1] = wps->psk1;
951 	len[1] = WPS_PSK_LEN;
952 	addr[2] = wpabuf_head(wps->dh_pubkey_e);
953 	len[2] = wpabuf_len(wps->dh_pubkey_e);
954 	addr[3] = wpabuf_head(wps->dh_pubkey_r);
955 	len[3] = wpabuf_len(wps->dh_pubkey_r);
956 	hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
957 	wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", hash, SHA256_MAC_LEN);
958 
959 	wpa_printf(MSG_DEBUG, "WPS:  * R-Hash2");
960 	wpabuf_put_be16(msg, ATTR_R_HASH2);
961 	wpabuf_put_be16(msg, SHA256_MAC_LEN);
962 	hash = wpabuf_put(msg, SHA256_MAC_LEN);
963 	/* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
964 	addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN;
965 	addr[1] = wps->psk2;
966 	hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
967 	wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", hash, SHA256_MAC_LEN);
968 
969 	return 0;
970 }
971 
972 
wps_build_r_snonce1(struct wps_data * wps,struct wpabuf * msg)973 static int wps_build_r_snonce1(struct wps_data *wps, struct wpabuf *msg)
974 {
975 	wpa_printf(MSG_DEBUG, "WPS:  * R-SNonce1");
976 	wpabuf_put_be16(msg, ATTR_R_SNONCE1);
977 	wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
978 	wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN);
979 	return 0;
980 }
981 
982 
wps_build_r_snonce2(struct wps_data * wps,struct wpabuf * msg)983 static int wps_build_r_snonce2(struct wps_data *wps, struct wpabuf *msg)
984 {
985 	wpa_printf(MSG_DEBUG, "WPS:  * R-SNonce2");
986 	wpabuf_put_be16(msg, ATTR_R_SNONCE2);
987 	wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
988 	wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN,
989 			WPS_SECRET_NONCE_LEN);
990 	return 0;
991 }
992 
993 
wps_build_cred_network_idx(struct wpabuf * msg,struct wps_credential * cred)994 static int wps_build_cred_network_idx(struct wpabuf *msg,
995 				      struct wps_credential *cred)
996 {
997 	wpa_printf(MSG_DEBUG, "WPS:  * Network Index");
998 	wpabuf_put_be16(msg, ATTR_NETWORK_INDEX);
999 	wpabuf_put_be16(msg, 1);
1000 	wpabuf_put_u8(msg, 1);
1001 	return 0;
1002 }
1003 
1004 
wps_build_cred_ssid(struct wpabuf * msg,struct wps_credential * cred)1005 static int wps_build_cred_ssid(struct wpabuf *msg,
1006 			       struct wps_credential *cred)
1007 {
1008 	wpa_printf(MSG_DEBUG, "WPS:  * SSID");
1009 	wpabuf_put_be16(msg, ATTR_SSID);
1010 	wpabuf_put_be16(msg, cred->ssid_len);
1011 	wpabuf_put_data(msg, cred->ssid, cred->ssid_len);
1012 	return 0;
1013 }
1014 
1015 
wps_build_cred_auth_type(struct wpabuf * msg,struct wps_credential * cred)1016 static int wps_build_cred_auth_type(struct wpabuf *msg,
1017 				    struct wps_credential *cred)
1018 {
1019 	wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type (0x%x)",
1020 		   cred->auth_type);
1021 	wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
1022 	wpabuf_put_be16(msg, 2);
1023 	wpabuf_put_be16(msg, cred->auth_type);
1024 	return 0;
1025 }
1026 
1027 
wps_build_cred_encr_type(struct wpabuf * msg,struct wps_credential * cred)1028 static int wps_build_cred_encr_type(struct wpabuf *msg,
1029 				    struct wps_credential *cred)
1030 {
1031 	wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type (0x%x)",
1032 		   cred->encr_type);
1033 	wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
1034 	wpabuf_put_be16(msg, 2);
1035 	wpabuf_put_be16(msg, cred->encr_type);
1036 	return 0;
1037 }
1038 
1039 
wps_build_cred_network_key(struct wpabuf * msg,struct wps_credential * cred)1040 static int wps_build_cred_network_key(struct wpabuf *msg,
1041 				      struct wps_credential *cred)
1042 {
1043 	wpa_printf(MSG_DEBUG, "WPS:  * Network Key");
1044 	wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
1045 	wpabuf_put_be16(msg, cred->key_len);
1046 	wpabuf_put_data(msg, cred->key, cred->key_len);
1047 	return 0;
1048 }
1049 
1050 
wps_build_cred_mac_addr(struct wpabuf * msg,struct wps_credential * cred)1051 static int wps_build_cred_mac_addr(struct wpabuf *msg,
1052 				   struct wps_credential *cred)
1053 {
1054 	wpa_printf(MSG_DEBUG, "WPS:  * MAC Address (" MACSTR ")",
1055 		   MAC2STR(cred->mac_addr));
1056 	wpabuf_put_be16(msg, ATTR_MAC_ADDR);
1057 	wpabuf_put_be16(msg, ETH_ALEN);
1058 	wpabuf_put_data(msg, cred->mac_addr, ETH_ALEN);
1059 	return 0;
1060 }
1061 
1062 
wps_build_credential(struct wpabuf * msg,struct wps_credential * cred)1063 static int wps_build_credential(struct wpabuf *msg,
1064 				struct wps_credential *cred)
1065 {
1066 	if (wps_build_cred_network_idx(msg, cred) ||
1067 	    wps_build_cred_ssid(msg, cred) ||
1068 	    wps_build_cred_auth_type(msg, cred) ||
1069 	    wps_build_cred_encr_type(msg, cred) ||
1070 	    wps_build_cred_network_key(msg, cred) ||
1071 	    wps_build_cred_mac_addr(msg, cred))
1072 		return -1;
1073 	return 0;
1074 }
1075 
1076 
wps_build_cred(struct wps_data * wps,struct wpabuf * msg)1077 static int wps_build_cred(struct wps_data *wps, struct wpabuf *msg)
1078 {
1079 	struct wpabuf *cred;
1080 
1081 	if (wps->wps->registrar->skip_cred_build)
1082 		goto skip_cred_build;
1083 
1084 	wpa_printf(MSG_DEBUG, "WPS:  * Credential");
1085 	os_memset(&wps->cred, 0, sizeof(wps->cred));
1086 
1087 	os_memcpy(wps->cred.ssid, wps->wps->ssid, wps->wps->ssid_len);
1088 	wps->cred.ssid_len = wps->wps->ssid_len;
1089 
1090 	/* Select the best authentication and encryption type */
1091 	if (wps->auth_type & WPS_AUTH_WPA2PSK)
1092 		wps->auth_type = WPS_AUTH_WPA2PSK;
1093 	else if (wps->auth_type & WPS_AUTH_WPAPSK)
1094 		wps->auth_type = WPS_AUTH_WPAPSK;
1095 	else if (wps->auth_type & WPS_AUTH_OPEN)
1096 		wps->auth_type = WPS_AUTH_OPEN;
1097 	else if (wps->auth_type & WPS_AUTH_SHARED)
1098 		wps->auth_type = WPS_AUTH_SHARED;
1099 	else {
1100 		wpa_printf(MSG_DEBUG, "WPS: Unsupported auth_type 0x%x",
1101 			   wps->auth_type);
1102 		return -1;
1103 	}
1104 	wps->cred.auth_type = wps->auth_type;
1105 
1106 	if (wps->auth_type == WPS_AUTH_WPA2PSK ||
1107 	    wps->auth_type == WPS_AUTH_WPAPSK) {
1108 		if (wps->encr_type & WPS_ENCR_AES)
1109 			wps->encr_type = WPS_ENCR_AES;
1110 		else if (wps->encr_type & WPS_ENCR_TKIP)
1111 			wps->encr_type = WPS_ENCR_TKIP;
1112 		else {
1113 			wpa_printf(MSG_DEBUG, "WPS: No suitable encryption "
1114 				   "type for WPA/WPA2");
1115 			return -1;
1116 		}
1117 	} else {
1118 		if (wps->encr_type & WPS_ENCR_WEP)
1119 			wps->encr_type = WPS_ENCR_WEP;
1120 		else if (wps->encr_type & WPS_ENCR_NONE)
1121 			wps->encr_type = WPS_ENCR_NONE;
1122 		else {
1123 			wpa_printf(MSG_DEBUG, "WPS: No suitable encryption "
1124 				   "type for non-WPA/WPA2 mode");
1125 			return -1;
1126 		}
1127 	}
1128 	wps->cred.encr_type = wps->encr_type;
1129 	/*
1130 	 * Set MAC address in the Credential to be the Enrollee's MAC address
1131 	 */
1132 	os_memcpy(wps->cred.mac_addr, wps->mac_addr_e, ETH_ALEN);
1133 
1134 	if (wps->wps->wps_state == WPS_STATE_NOT_CONFIGURED && wps->wps->ap &&
1135 	    !wps->wps->registrar->disable_auto_conf) {
1136 		u8 r[16];
1137 		/* Generate a random passphrase */
1138 		if (os_get_random(r, sizeof(r)) < 0)
1139 			return -1;
1140 		os_free(wps->new_psk);
1141 		wps->new_psk = base64_encode(r, sizeof(r), &wps->new_psk_len);
1142 		if (wps->new_psk == NULL)
1143 			return -1;
1144 		wps->new_psk_len--; /* remove newline */
1145 		while (wps->new_psk_len &&
1146 		       wps->new_psk[wps->new_psk_len - 1] == '=')
1147 			wps->new_psk_len--;
1148 		wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Generated passphrase",
1149 				      wps->new_psk, wps->new_psk_len);
1150 		os_memcpy(wps->cred.key, wps->new_psk, wps->new_psk_len);
1151 		wps->cred.key_len = wps->new_psk_len;
1152 	} else if (wps->wps->network_key) {
1153 		os_memcpy(wps->cred.key, wps->wps->network_key,
1154 			  wps->wps->network_key_len);
1155 		wps->cred.key_len = wps->wps->network_key_len;
1156 	} else if (wps->auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) {
1157 		char hex[65];
1158 		/* Generate a random per-device PSK */
1159 		os_free(wps->new_psk);
1160 		wps->new_psk_len = 32;
1161 		wps->new_psk = os_malloc(wps->new_psk_len);
1162 		if (wps->new_psk == NULL)
1163 			return -1;
1164 		if (os_get_random(wps->new_psk, wps->new_psk_len) < 0) {
1165 			os_free(wps->new_psk);
1166 			wps->new_psk = NULL;
1167 			return -1;
1168 		}
1169 		wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK",
1170 				wps->new_psk, wps->new_psk_len);
1171 		wpa_snprintf_hex(hex, sizeof(hex), wps->new_psk,
1172 				 wps->new_psk_len);
1173 		os_memcpy(wps->cred.key, hex, wps->new_psk_len * 2);
1174 		wps->cred.key_len = wps->new_psk_len * 2;
1175 	}
1176 
1177 	cred = wpabuf_alloc(200);
1178 	if (cred == NULL)
1179 		return -1;
1180 
1181 	if (wps_build_credential(cred, &wps->cred)) {
1182 		wpabuf_free(cred);
1183 		return -1;
1184 	}
1185 
1186 	wpabuf_put_be16(msg, ATTR_CRED);
1187 	wpabuf_put_be16(msg, wpabuf_len(cred));
1188 	wpabuf_put_buf(msg, cred);
1189 	wpabuf_free(cred);
1190 
1191 skip_cred_build:
1192 	if (wps->wps->registrar->extra_cred) {
1193 		wpa_printf(MSG_DEBUG, "WPS:  * Credential (pre-configured)");
1194 		wpabuf_put_buf(msg, wps->wps->registrar->extra_cred);
1195 	}
1196 
1197 	return 0;
1198 }
1199 
1200 
wps_build_ap_settings(struct wps_data * wps,struct wpabuf * msg)1201 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *msg)
1202 {
1203 	wpa_printf(MSG_DEBUG, "WPS:  * AP Settings");
1204 
1205 	if (wps_build_credential(msg, &wps->cred))
1206 		return -1;
1207 
1208 	return 0;
1209 }
1210 
1211 
wps_build_m2(struct wps_data * wps)1212 static struct wpabuf * wps_build_m2(struct wps_data *wps)
1213 {
1214 	struct wpabuf *msg;
1215 
1216 	if (os_get_random(wps->nonce_r, WPS_NONCE_LEN) < 0)
1217 		return NULL;
1218 	wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
1219 		    wps->nonce_r, WPS_NONCE_LEN);
1220 	wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
1221 
1222 	wpa_printf(MSG_DEBUG, "WPS: Building Message M2");
1223 	msg = wpabuf_alloc(1000);
1224 	if (msg == NULL)
1225 		return NULL;
1226 
1227 	if (wps_build_version(msg) ||
1228 	    wps_build_msg_type(msg, WPS_M2) ||
1229 	    wps_build_enrollee_nonce(wps, msg) ||
1230 	    wps_build_registrar_nonce(wps, msg) ||
1231 	    wps_build_uuid_r(wps, msg) ||
1232 	    wps_build_public_key(wps, msg) ||
1233 	    wps_derive_keys(wps) ||
1234 	    wps_build_auth_type_flags(wps, msg) ||
1235 	    wps_build_encr_type_flags(wps, msg) ||
1236 	    wps_build_conn_type_flags(wps, msg) ||
1237 	    wps_build_config_methods_r(wps->wps->registrar, msg) ||
1238 	    wps_build_device_attrs(&wps->wps->dev, msg) ||
1239 	    wps_build_rf_bands(&wps->wps->dev, msg) ||
1240 	    wps_build_assoc_state(wps, msg) ||
1241 	    wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
1242 	    wps_build_dev_password_id(msg, wps->dev_pw_id) ||
1243 	    wps_build_os_version(&wps->wps->dev, msg) ||
1244 	    wps_build_authenticator(wps, msg)) {
1245 		wpabuf_free(msg);
1246 		return NULL;
1247 	}
1248 
1249 	wps->state = RECV_M3;
1250 	return msg;
1251 }
1252 
1253 
wps_build_m2d(struct wps_data * wps)1254 static struct wpabuf * wps_build_m2d(struct wps_data *wps)
1255 {
1256 	struct wpabuf *msg;
1257 	u16 err = wps->config_error;
1258 
1259 	wpa_printf(MSG_DEBUG, "WPS: Building Message M2D");
1260 	msg = wpabuf_alloc(1000);
1261 	if (msg == NULL)
1262 		return NULL;
1263 
1264 	if (wps->wps->ap && wps->wps->ap_setup_locked &&
1265 	    err == WPS_CFG_NO_ERROR)
1266 		err = WPS_CFG_SETUP_LOCKED;
1267 
1268 	if (wps_build_version(msg) ||
1269 	    wps_build_msg_type(msg, WPS_M2D) ||
1270 	    wps_build_enrollee_nonce(wps, msg) ||
1271 	    wps_build_registrar_nonce(wps, msg) ||
1272 	    wps_build_uuid_r(wps, msg) ||
1273 	    wps_build_auth_type_flags(wps, msg) ||
1274 	    wps_build_encr_type_flags(wps, msg) ||
1275 	    wps_build_conn_type_flags(wps, msg) ||
1276 	    wps_build_config_methods_r(wps->wps->registrar, msg) ||
1277 	    wps_build_device_attrs(&wps->wps->dev, msg) ||
1278 	    wps_build_rf_bands(&wps->wps->dev, msg) ||
1279 	    wps_build_assoc_state(wps, msg) ||
1280 	    wps_build_config_error(msg, err) ||
1281 	    wps_build_os_version(&wps->wps->dev, msg)) {
1282 		wpabuf_free(msg);
1283 		return NULL;
1284 	}
1285 
1286 	wps->state = RECV_M2D_ACK;
1287 	return msg;
1288 }
1289 
1290 
wps_build_m4(struct wps_data * wps)1291 static struct wpabuf * wps_build_m4(struct wps_data *wps)
1292 {
1293 	struct wpabuf *msg, *plain;
1294 
1295 	wpa_printf(MSG_DEBUG, "WPS: Building Message M4");
1296 
1297 	wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
1298 
1299 	plain = wpabuf_alloc(200);
1300 	if (plain == NULL)
1301 		return NULL;
1302 
1303 	msg = wpabuf_alloc(1000);
1304 	if (msg == NULL) {
1305 		wpabuf_free(plain);
1306 		return NULL;
1307 	}
1308 
1309 	if (wps_build_version(msg) ||
1310 	    wps_build_msg_type(msg, WPS_M4) ||
1311 	    wps_build_enrollee_nonce(wps, msg) ||
1312 	    wps_build_r_hash(wps, msg) ||
1313 	    wps_build_r_snonce1(wps, plain) ||
1314 	    wps_build_key_wrap_auth(wps, plain) ||
1315 	    wps_build_encr_settings(wps, msg, plain) ||
1316 	    wps_build_authenticator(wps, msg)) {
1317 		wpabuf_free(plain);
1318 		wpabuf_free(msg);
1319 		return NULL;
1320 	}
1321 	wpabuf_free(plain);
1322 
1323 	wps->state = RECV_M5;
1324 	return msg;
1325 }
1326 
1327 
wps_build_m6(struct wps_data * wps)1328 static struct wpabuf * wps_build_m6(struct wps_data *wps)
1329 {
1330 	struct wpabuf *msg, *plain;
1331 
1332 	wpa_printf(MSG_DEBUG, "WPS: Building Message M6");
1333 
1334 	plain = wpabuf_alloc(200);
1335 	if (plain == NULL)
1336 		return NULL;
1337 
1338 	msg = wpabuf_alloc(1000);
1339 	if (msg == NULL) {
1340 		wpabuf_free(plain);
1341 		return NULL;
1342 	}
1343 
1344 	if (wps_build_version(msg) ||
1345 	    wps_build_msg_type(msg, WPS_M6) ||
1346 	    wps_build_enrollee_nonce(wps, msg) ||
1347 	    wps_build_r_snonce2(wps, plain) ||
1348 	    wps_build_key_wrap_auth(wps, plain) ||
1349 	    wps_build_encr_settings(wps, msg, plain) ||
1350 	    wps_build_authenticator(wps, msg)) {
1351 		wpabuf_free(plain);
1352 		wpabuf_free(msg);
1353 		return NULL;
1354 	}
1355 	wpabuf_free(plain);
1356 
1357 	wps->wps_pin_revealed = 1;
1358 	wps->state = RECV_M7;
1359 	return msg;
1360 }
1361 
1362 
wps_build_m8(struct wps_data * wps)1363 static struct wpabuf * wps_build_m8(struct wps_data *wps)
1364 {
1365 	struct wpabuf *msg, *plain;
1366 
1367 	wpa_printf(MSG_DEBUG, "WPS: Building Message M8");
1368 
1369 	plain = wpabuf_alloc(500);
1370 	if (plain == NULL)
1371 		return NULL;
1372 
1373 	msg = wpabuf_alloc(1000);
1374 	if (msg == NULL) {
1375 		wpabuf_free(plain);
1376 		return NULL;
1377 	}
1378 
1379 	if (wps_build_version(msg) ||
1380 	    wps_build_msg_type(msg, WPS_M8) ||
1381 	    wps_build_enrollee_nonce(wps, msg) ||
1382 	    (wps->wps->ap && wps_build_cred(wps, plain)) ||
1383 	    (!wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
1384 	    wps_build_key_wrap_auth(wps, plain) ||
1385 	    wps_build_encr_settings(wps, msg, plain) ||
1386 	    wps_build_authenticator(wps, msg)) {
1387 		wpabuf_free(plain);
1388 		wpabuf_free(msg);
1389 		return NULL;
1390 	}
1391 	wpabuf_free(plain);
1392 
1393 	wps->state = RECV_DONE;
1394 	return msg;
1395 }
1396 
1397 
wps_build_wsc_ack(struct wps_data * wps)1398 static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
1399 {
1400 	struct wpabuf *msg;
1401 
1402 	wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
1403 
1404 	msg = wpabuf_alloc(1000);
1405 	if (msg == NULL)
1406 		return NULL;
1407 
1408 	if (wps_build_version(msg) ||
1409 	    wps_build_msg_type(msg, WPS_WSC_ACK) ||
1410 	    wps_build_enrollee_nonce(wps, msg) ||
1411 	    wps_build_registrar_nonce(wps, msg)) {
1412 		wpabuf_free(msg);
1413 		return NULL;
1414 	}
1415 
1416 	return msg;
1417 }
1418 
1419 
wps_build_wsc_nack(struct wps_data * wps)1420 static struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
1421 {
1422 	struct wpabuf *msg;
1423 
1424 	wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
1425 
1426 	msg = wpabuf_alloc(1000);
1427 	if (msg == NULL)
1428 		return NULL;
1429 
1430 	if (wps_build_version(msg) ||
1431 	    wps_build_msg_type(msg, WPS_WSC_NACK) ||
1432 	    wps_build_enrollee_nonce(wps, msg) ||
1433 	    wps_build_registrar_nonce(wps, msg) ||
1434 	    wps_build_config_error(msg, wps->config_error)) {
1435 		wpabuf_free(msg);
1436 		return NULL;
1437 	}
1438 
1439 	return msg;
1440 }
1441 
1442 
wps_registrar_get_msg(struct wps_data * wps,enum wsc_op_code * op_code)1443 struct wpabuf * wps_registrar_get_msg(struct wps_data *wps,
1444 				      enum wsc_op_code *op_code)
1445 {
1446 	struct wpabuf *msg;
1447 
1448 #ifdef CONFIG_WPS_UPNP
1449 	if (wps->wps->wps_upnp) {
1450 		struct upnp_pending_message *p, *prev = NULL;
1451 		if (wps->ext_reg > 1)
1452 			wps_registrar_free_pending_m2(wps->wps);
1453 		p = wps->wps->upnp_msgs;
1454 		/* TODO: check pending message MAC address */
1455 		while (p && p->next) {
1456 			prev = p;
1457 			p = p->next;
1458 		}
1459 		if (p) {
1460 			wpa_printf(MSG_DEBUG, "WPS: Use pending message from "
1461 				   "UPnP");
1462 			if (prev)
1463 				prev->next = NULL;
1464 			else
1465 				wps->wps->upnp_msgs = NULL;
1466 			msg = p->msg;
1467 			switch (p->type) {
1468 			case WPS_WSC_ACK:
1469 				*op_code = WSC_ACK;
1470 				break;
1471 			case WPS_WSC_NACK:
1472 				*op_code = WSC_NACK;
1473 				break;
1474 			default:
1475 				*op_code = WSC_MSG;
1476 				break;
1477 			}
1478 			os_free(p);
1479 			if (wps->ext_reg == 0)
1480 				wps->ext_reg = 1;
1481 			return msg;
1482 		}
1483 	}
1484 	if (wps->ext_reg) {
1485 		wpa_printf(MSG_DEBUG, "WPS: Using external Registrar, but no "
1486 			   "pending message available");
1487 		return NULL;
1488 	}
1489 #endif /* CONFIG_WPS_UPNP */
1490 
1491 	switch (wps->state) {
1492 	case SEND_M2:
1493 		if (wps_get_dev_password(wps) < 0)
1494 			msg = wps_build_m2d(wps);
1495 		else
1496 			msg = wps_build_m2(wps);
1497 		*op_code = WSC_MSG;
1498 		break;
1499 	case SEND_M2D:
1500 		msg = wps_build_m2d(wps);
1501 		*op_code = WSC_MSG;
1502 		break;
1503 	case SEND_M4:
1504 		msg = wps_build_m4(wps);
1505 		*op_code = WSC_MSG;
1506 		break;
1507 	case SEND_M6:
1508 		msg = wps_build_m6(wps);
1509 		*op_code = WSC_MSG;
1510 		break;
1511 	case SEND_M8:
1512 		msg = wps_build_m8(wps);
1513 		*op_code = WSC_MSG;
1514 		break;
1515 	case RECV_DONE:
1516 		msg = wps_build_wsc_ack(wps);
1517 		*op_code = WSC_ACK;
1518 		break;
1519 	case SEND_WSC_NACK:
1520 		msg = wps_build_wsc_nack(wps);
1521 		*op_code = WSC_NACK;
1522 		break;
1523 	default:
1524 		wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
1525 			   "a message", wps->state);
1526 		msg = NULL;
1527 		break;
1528 	}
1529 
1530 	if (*op_code == WSC_MSG && msg) {
1531 		/* Save a copy of the last message for Authenticator derivation
1532 		 */
1533 		wpabuf_free(wps->last_msg);
1534 		wps->last_msg = wpabuf_dup(msg);
1535 	}
1536 
1537 	return msg;
1538 }
1539 
1540 
wps_process_enrollee_nonce(struct wps_data * wps,const u8 * e_nonce)1541 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
1542 {
1543 	if (e_nonce == NULL) {
1544 		wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
1545 		return -1;
1546 	}
1547 
1548 	os_memcpy(wps->nonce_e, e_nonce, WPS_NONCE_LEN);
1549 	wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
1550 		    wps->nonce_e, WPS_NONCE_LEN);
1551 
1552 	return 0;
1553 }
1554 
1555 
wps_process_registrar_nonce(struct wps_data * wps,const u8 * r_nonce)1556 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
1557 {
1558 	if (r_nonce == NULL) {
1559 		wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
1560 		return -1;
1561 	}
1562 
1563 	if (os_memcmp(wps->nonce_r, r_nonce, WPS_NONCE_LEN) != 0) {
1564 		wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Nonce received");
1565 		return -1;
1566 	}
1567 
1568 	return 0;
1569 }
1570 
1571 
wps_process_uuid_e(struct wps_data * wps,const u8 * uuid_e)1572 static int wps_process_uuid_e(struct wps_data *wps, const u8 *uuid_e)
1573 {
1574 	if (uuid_e == NULL) {
1575 		wpa_printf(MSG_DEBUG, "WPS: No UUID-E received");
1576 		return -1;
1577 	}
1578 
1579 	os_memcpy(wps->uuid_e, uuid_e, WPS_UUID_LEN);
1580 	wpa_hexdump(MSG_DEBUG, "WPS: UUID-E", wps->uuid_e, WPS_UUID_LEN);
1581 
1582 	return 0;
1583 }
1584 
1585 
wps_process_dev_password_id(struct wps_data * wps,const u8 * pw_id)1586 static int wps_process_dev_password_id(struct wps_data *wps, const u8 *pw_id)
1587 {
1588 	if (pw_id == NULL) {
1589 		wpa_printf(MSG_DEBUG, "WPS: No Device Password ID received");
1590 		return -1;
1591 	}
1592 
1593 	wps->dev_pw_id = WPA_GET_BE16(pw_id);
1594 	wpa_printf(MSG_DEBUG, "WPS: Device Password ID %d", wps->dev_pw_id);
1595 
1596 	return 0;
1597 }
1598 
1599 
wps_process_e_hash1(struct wps_data * wps,const u8 * e_hash1)1600 static int wps_process_e_hash1(struct wps_data *wps, const u8 *e_hash1)
1601 {
1602 	if (e_hash1 == NULL) {
1603 		wpa_printf(MSG_DEBUG, "WPS: No E-Hash1 received");
1604 		return -1;
1605 	}
1606 
1607 	os_memcpy(wps->peer_hash1, e_hash1, WPS_HASH_LEN);
1608 	wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", wps->peer_hash1, WPS_HASH_LEN);
1609 
1610 	return 0;
1611 }
1612 
1613 
wps_process_e_hash2(struct wps_data * wps,const u8 * e_hash2)1614 static int wps_process_e_hash2(struct wps_data *wps, const u8 *e_hash2)
1615 {
1616 	if (e_hash2 == NULL) {
1617 		wpa_printf(MSG_DEBUG, "WPS: No E-Hash2 received");
1618 		return -1;
1619 	}
1620 
1621 	os_memcpy(wps->peer_hash2, e_hash2, WPS_HASH_LEN);
1622 	wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", wps->peer_hash2, WPS_HASH_LEN);
1623 
1624 	return 0;
1625 }
1626 
1627 
wps_process_e_snonce1(struct wps_data * wps,const u8 * e_snonce1)1628 static int wps_process_e_snonce1(struct wps_data *wps, const u8 *e_snonce1)
1629 {
1630 	u8 hash[SHA256_MAC_LEN];
1631 	const u8 *addr[4];
1632 	size_t len[4];
1633 
1634 	if (e_snonce1 == NULL) {
1635 		wpa_printf(MSG_DEBUG, "WPS: No E-SNonce1 received");
1636 		return -1;
1637 	}
1638 
1639 	wpa_hexdump_key(MSG_DEBUG, "WPS: E-SNonce1", e_snonce1,
1640 			WPS_SECRET_NONCE_LEN);
1641 
1642 	/* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */
1643 	addr[0] = e_snonce1;
1644 	len[0] = WPS_SECRET_NONCE_LEN;
1645 	addr[1] = wps->psk1;
1646 	len[1] = WPS_PSK_LEN;
1647 	addr[2] = wpabuf_head(wps->dh_pubkey_e);
1648 	len[2] = wpabuf_len(wps->dh_pubkey_e);
1649 	addr[3] = wpabuf_head(wps->dh_pubkey_r);
1650 	len[3] = wpabuf_len(wps->dh_pubkey_r);
1651 	hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
1652 
1653 	if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
1654 		wpa_printf(MSG_DEBUG, "WPS: E-Hash1 derived from E-S1 does "
1655 			   "not match with the pre-committed value");
1656 		wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
1657 		wps_pwd_auth_fail_event(wps->wps, 0, 1);
1658 		return -1;
1659 	}
1660 
1661 	wpa_printf(MSG_DEBUG, "WPS: Enrollee proved knowledge of the first "
1662 		   "half of the device password");
1663 
1664 	return 0;
1665 }
1666 
1667 
wps_process_e_snonce2(struct wps_data * wps,const u8 * e_snonce2)1668 static int wps_process_e_snonce2(struct wps_data *wps, const u8 *e_snonce2)
1669 {
1670 	u8 hash[SHA256_MAC_LEN];
1671 	const u8 *addr[4];
1672 	size_t len[4];
1673 
1674 	if (e_snonce2 == NULL) {
1675 		wpa_printf(MSG_DEBUG, "WPS: No E-SNonce2 received");
1676 		return -1;
1677 	}
1678 
1679 	wpa_hexdump_key(MSG_DEBUG, "WPS: E-SNonce2", e_snonce2,
1680 			WPS_SECRET_NONCE_LEN);
1681 
1682 	/* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */
1683 	addr[0] = e_snonce2;
1684 	len[0] = WPS_SECRET_NONCE_LEN;
1685 	addr[1] = wps->psk2;
1686 	len[1] = WPS_PSK_LEN;
1687 	addr[2] = wpabuf_head(wps->dh_pubkey_e);
1688 	len[2] = wpabuf_len(wps->dh_pubkey_e);
1689 	addr[3] = wpabuf_head(wps->dh_pubkey_r);
1690 	len[3] = wpabuf_len(wps->dh_pubkey_r);
1691 	hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
1692 
1693 	if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
1694 		wpa_printf(MSG_DEBUG, "WPS: E-Hash2 derived from E-S2 does "
1695 			   "not match with the pre-committed value");
1696 		wps_registrar_invalidate_pin(wps->wps->registrar, wps->uuid_e);
1697 		wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
1698 		wps_pwd_auth_fail_event(wps->wps, 0, 2);
1699 		return -1;
1700 	}
1701 
1702 	wpa_printf(MSG_DEBUG, "WPS: Enrollee proved knowledge of the second "
1703 		   "half of the device password");
1704 	wps->wps_pin_revealed = 0;
1705 	wps_registrar_unlock_pin(wps->wps->registrar, wps->uuid_e);
1706 
1707 	return 0;
1708 }
1709 
1710 
wps_process_mac_addr(struct wps_data * wps,const u8 * mac_addr)1711 static int wps_process_mac_addr(struct wps_data *wps, const u8 *mac_addr)
1712 {
1713 	if (mac_addr == NULL) {
1714 		wpa_printf(MSG_DEBUG, "WPS: No MAC Address received");
1715 		return -1;
1716 	}
1717 
1718 	wpa_printf(MSG_DEBUG, "WPS: Enrollee MAC Address " MACSTR,
1719 		   MAC2STR(mac_addr));
1720 	os_memcpy(wps->mac_addr_e, mac_addr, ETH_ALEN);
1721 	os_memcpy(wps->peer_dev.mac_addr, mac_addr, ETH_ALEN);
1722 
1723 	return 0;
1724 }
1725 
1726 
wps_process_pubkey(struct wps_data * wps,const u8 * pk,size_t pk_len)1727 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
1728 			      size_t pk_len)
1729 {
1730 	if (pk == NULL || pk_len == 0) {
1731 		wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
1732 		return -1;
1733 	}
1734 
1735 	wpabuf_free(wps->dh_pubkey_e);
1736 	wps->dh_pubkey_e = wpabuf_alloc_copy(pk, pk_len);
1737 	if (wps->dh_pubkey_e == NULL)
1738 		return -1;
1739 
1740 	return 0;
1741 }
1742 
1743 
wps_process_auth_type_flags(struct wps_data * wps,const u8 * auth)1744 static int wps_process_auth_type_flags(struct wps_data *wps, const u8 *auth)
1745 {
1746 	u16 auth_types;
1747 
1748 	if (auth == NULL) {
1749 		wpa_printf(MSG_DEBUG, "WPS: No Authentication Type flags "
1750 			   "received");
1751 		return -1;
1752 	}
1753 
1754 	auth_types = WPA_GET_BE16(auth);
1755 
1756 	wpa_printf(MSG_DEBUG, "WPS: Enrollee Authentication Type flags 0x%x",
1757 		   auth_types);
1758 	wps->auth_type = wps->wps->auth_types & auth_types;
1759 	if (wps->auth_type == 0) {
1760 		wpa_printf(MSG_DEBUG, "WPS: No match in supported "
1761 			   "authentication types (own 0x%x Enrollee 0x%x)",
1762 			   wps->wps->auth_types, auth_types);
1763 #ifdef WPS_WORKAROUNDS
1764 		/*
1765 		 * Some deployed implementations seem to advertise incorrect
1766 		 * information in this attribute. For example, Linksys WRT350N
1767 		 * seems to have a byteorder bug that breaks this negotiation.
1768 		 * In order to interoperate with existing implementations,
1769 		 * assume that the Enrollee supports everything we do.
1770 		 */
1771 		wpa_printf(MSG_DEBUG, "WPS: Workaround - assume Enrollee "
1772 			   "does not advertise supported authentication types "
1773 			   "correctly");
1774 		wps->auth_type = wps->wps->auth_types;
1775 #else /* WPS_WORKAROUNDS */
1776 		return -1;
1777 #endif /* WPS_WORKAROUNDS */
1778 	}
1779 
1780 	return 0;
1781 }
1782 
1783 
wps_process_encr_type_flags(struct wps_data * wps,const u8 * encr)1784 static int wps_process_encr_type_flags(struct wps_data *wps, const u8 *encr)
1785 {
1786 	u16 encr_types;
1787 
1788 	if (encr == NULL) {
1789 		wpa_printf(MSG_DEBUG, "WPS: No Encryption Type flags "
1790 			   "received");
1791 		return -1;
1792 	}
1793 
1794 	encr_types = WPA_GET_BE16(encr);
1795 
1796 	wpa_printf(MSG_DEBUG, "WPS: Enrollee Encryption Type flags 0x%x",
1797 		   encr_types);
1798 	wps->encr_type = wps->wps->encr_types & encr_types;
1799 	if (wps->encr_type == 0) {
1800 		wpa_printf(MSG_DEBUG, "WPS: No match in supported "
1801 			   "encryption types (own 0x%x Enrollee 0x%x)",
1802 			   wps->wps->encr_types, encr_types);
1803 #ifdef WPS_WORKAROUNDS
1804 		/*
1805 		 * Some deployed implementations seem to advertise incorrect
1806 		 * information in this attribute. For example, Linksys WRT350N
1807 		 * seems to have a byteorder bug that breaks this negotiation.
1808 		 * In order to interoperate with existing implementations,
1809 		 * assume that the Enrollee supports everything we do.
1810 		 */
1811 		wpa_printf(MSG_DEBUG, "WPS: Workaround - assume Enrollee "
1812 			   "does not advertise supported encryption types "
1813 			   "correctly");
1814 		wps->encr_type = wps->wps->encr_types;
1815 #else /* WPS_WORKAROUNDS */
1816 		return -1;
1817 #endif /* WPS_WORKAROUNDS */
1818 	}
1819 
1820 	return 0;
1821 }
1822 
1823 
wps_process_conn_type_flags(struct wps_data * wps,const u8 * conn)1824 static int wps_process_conn_type_flags(struct wps_data *wps, const u8 *conn)
1825 {
1826 	if (conn == NULL) {
1827 		wpa_printf(MSG_DEBUG, "WPS: No Connection Type flags "
1828 			   "received");
1829 		return -1;
1830 	}
1831 
1832 	wpa_printf(MSG_DEBUG, "WPS: Enrollee Connection Type flags 0x%x",
1833 		   *conn);
1834 
1835 	return 0;
1836 }
1837 
1838 
wps_process_config_methods(struct wps_data * wps,const u8 * methods)1839 static int wps_process_config_methods(struct wps_data *wps, const u8 *methods)
1840 {
1841 	u16 m;
1842 
1843 	if (methods == NULL) {
1844 		wpa_printf(MSG_DEBUG, "WPS: No Config Methods received");
1845 		return -1;
1846 	}
1847 
1848 	m = WPA_GET_BE16(methods);
1849 
1850 	wpa_printf(MSG_DEBUG, "WPS: Enrollee Config Methods 0x%x", m);
1851 
1852 	return 0;
1853 }
1854 
1855 
wps_process_wps_state(struct wps_data * wps,const u8 * state)1856 static int wps_process_wps_state(struct wps_data *wps, const u8 *state)
1857 {
1858 	if (state == NULL) {
1859 		wpa_printf(MSG_DEBUG, "WPS: No Wi-Fi Protected Setup State "
1860 			   "received");
1861 		return -1;
1862 	}
1863 
1864 	wpa_printf(MSG_DEBUG, "WPS: Enrollee Wi-Fi Protected Setup State %d",
1865 		   *state);
1866 
1867 	return 0;
1868 }
1869 
1870 
wps_process_assoc_state(struct wps_data * wps,const u8 * assoc)1871 static int wps_process_assoc_state(struct wps_data *wps, const u8 *assoc)
1872 {
1873 	u16 a;
1874 
1875 	if (assoc == NULL) {
1876 		wpa_printf(MSG_DEBUG, "WPS: No Association State received");
1877 		return -1;
1878 	}
1879 
1880 	a = WPA_GET_BE16(assoc);
1881 	wpa_printf(MSG_DEBUG, "WPS: Enrollee Association State %d", a);
1882 
1883 	return 0;
1884 }
1885 
1886 
wps_process_config_error(struct wps_data * wps,const u8 * err)1887 static int wps_process_config_error(struct wps_data *wps, const u8 *err)
1888 {
1889 	u16 e;
1890 
1891 	if (err == NULL) {
1892 		wpa_printf(MSG_DEBUG, "WPS: No Configuration Error received");
1893 		return -1;
1894 	}
1895 
1896 	e = WPA_GET_BE16(err);
1897 	wpa_printf(MSG_DEBUG, "WPS: Enrollee Configuration Error %d", e);
1898 
1899 	return 0;
1900 }
1901 
1902 
wps_process_m1(struct wps_data * wps,struct wps_parse_attr * attr)1903 static enum wps_process_res wps_process_m1(struct wps_data *wps,
1904 					   struct wps_parse_attr *attr)
1905 {
1906 	wpa_printf(MSG_DEBUG, "WPS: Received M1");
1907 
1908 	if (wps->state != RECV_M1) {
1909 		wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1910 			   "receiving M1", wps->state);
1911 		return WPS_FAILURE;
1912 	}
1913 
1914 	if (wps_process_uuid_e(wps, attr->uuid_e) ||
1915 	    wps_process_mac_addr(wps, attr->mac_addr) ||
1916 	    wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1917 	    wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
1918 	    wps_process_auth_type_flags(wps, attr->auth_type_flags) ||
1919 	    wps_process_encr_type_flags(wps, attr->encr_type_flags) ||
1920 	    wps_process_conn_type_flags(wps, attr->conn_type_flags) ||
1921 	    wps_process_config_methods(wps, attr->config_methods) ||
1922 	    wps_process_wps_state(wps, attr->wps_state) ||
1923 	    wps_process_device_attrs(&wps->peer_dev, attr) ||
1924 	    wps_process_rf_bands(&wps->peer_dev, attr->rf_bands) ||
1925 	    wps_process_assoc_state(wps, attr->assoc_state) ||
1926 	    wps_process_dev_password_id(wps, attr->dev_password_id) ||
1927 	    wps_process_config_error(wps, attr->config_error) ||
1928 	    wps_process_os_version(&wps->peer_dev, attr->os_version))
1929 		return WPS_FAILURE;
1930 
1931 	if (wps->dev_pw_id != DEV_PW_DEFAULT &&
1932 	    wps->dev_pw_id != DEV_PW_USER_SPECIFIED &&
1933 	    wps->dev_pw_id != DEV_PW_MACHINE_SPECIFIED &&
1934 	    wps->dev_pw_id != DEV_PW_REGISTRAR_SPECIFIED &&
1935 	    (wps->dev_pw_id != DEV_PW_PUSHBUTTON ||
1936 	     !wps->wps->registrar->pbc)) {
1937 		wpa_printf(MSG_DEBUG, "WPS: Unsupported Device Password ID %d",
1938 			   wps->dev_pw_id);
1939 		wps->state = SEND_M2D;
1940 		return WPS_CONTINUE;
1941 	}
1942 
1943 	if (wps->dev_pw_id == DEV_PW_PUSHBUTTON) {
1944 		if (wps->wps->registrar->force_pbc_overlap ||
1945 		    wps_registrar_pbc_overlap(wps->wps->registrar,
1946 					      wps->mac_addr_e, wps->uuid_e)) {
1947 			wpa_printf(MSG_DEBUG, "WPS: PBC overlap - deny PBC "
1948 				   "negotiation");
1949 			wps->state = SEND_M2D;
1950 			wps->config_error = WPS_CFG_MULTIPLE_PBC_DETECTED;
1951 			wps_pbc_overlap_event(wps->wps);
1952 			wps->wps->registrar->force_pbc_overlap = 1;
1953 			return WPS_CONTINUE;
1954 		}
1955 		wps_registrar_add_pbc_session(wps->wps->registrar,
1956 					      wps->mac_addr_e, wps->uuid_e);
1957 		wps->pbc = 1;
1958 	}
1959 
1960 	wps->state = SEND_M2;
1961 	return WPS_CONTINUE;
1962 }
1963 
1964 
wps_process_m3(struct wps_data * wps,const struct wpabuf * msg,struct wps_parse_attr * attr)1965 static enum wps_process_res wps_process_m3(struct wps_data *wps,
1966 					   const struct wpabuf *msg,
1967 					   struct wps_parse_attr *attr)
1968 {
1969 	wpa_printf(MSG_DEBUG, "WPS: Received M3");
1970 
1971 	if (wps->state != RECV_M3) {
1972 		wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1973 			   "receiving M3", wps->state);
1974 		wps->state = SEND_WSC_NACK;
1975 		return WPS_CONTINUE;
1976 	}
1977 
1978 	if (wps->pbc && wps->wps->registrar->force_pbc_overlap) {
1979 		wpa_printf(MSG_DEBUG, "WPS: Reject negotiation due to PBC "
1980 			   "session overlap");
1981 		wps->state = SEND_WSC_NACK;
1982 		wps->config_error = WPS_CFG_MULTIPLE_PBC_DETECTED;
1983 		return WPS_CONTINUE;
1984 	}
1985 
1986 	if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
1987 	    wps_process_authenticator(wps, attr->authenticator, msg) ||
1988 	    wps_process_e_hash1(wps, attr->e_hash1) ||
1989 	    wps_process_e_hash2(wps, attr->e_hash2)) {
1990 		wps->state = SEND_WSC_NACK;
1991 		return WPS_CONTINUE;
1992 	}
1993 
1994 	wps->state = SEND_M4;
1995 	return WPS_CONTINUE;
1996 }
1997 
1998 
wps_process_m5(struct wps_data * wps,const struct wpabuf * msg,struct wps_parse_attr * attr)1999 static enum wps_process_res wps_process_m5(struct wps_data *wps,
2000 					   const struct wpabuf *msg,
2001 					   struct wps_parse_attr *attr)
2002 {
2003 	struct wpabuf *decrypted;
2004 	struct wps_parse_attr eattr;
2005 
2006 	wpa_printf(MSG_DEBUG, "WPS: Received M5");
2007 
2008 	if (wps->state != RECV_M5) {
2009 		wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
2010 			   "receiving M5", wps->state);
2011 		wps->state = SEND_WSC_NACK;
2012 		return WPS_CONTINUE;
2013 	}
2014 
2015 	if (wps->pbc && wps->wps->registrar->force_pbc_overlap) {
2016 		wpa_printf(MSG_DEBUG, "WPS: Reject negotiation due to PBC "
2017 			   "session overlap");
2018 		wps->state = SEND_WSC_NACK;
2019 		wps->config_error = WPS_CFG_MULTIPLE_PBC_DETECTED;
2020 		return WPS_CONTINUE;
2021 	}
2022 
2023 	if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
2024 	    wps_process_authenticator(wps, attr->authenticator, msg)) {
2025 		wps->state = SEND_WSC_NACK;
2026 		return WPS_CONTINUE;
2027 	}
2028 
2029 	decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
2030 					      attr->encr_settings_len);
2031 	if (decrypted == NULL) {
2032 		wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
2033 			   "Settings attribute");
2034 		wps->state = SEND_WSC_NACK;
2035 		return WPS_CONTINUE;
2036 	}
2037 
2038 	wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
2039 		   "attribute");
2040 	if (wps_parse_msg(decrypted, &eattr) < 0 ||
2041 	    wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
2042 	    wps_process_e_snonce1(wps, eattr.e_snonce1)) {
2043 		wpabuf_free(decrypted);
2044 		wps->state = SEND_WSC_NACK;
2045 		return WPS_CONTINUE;
2046 	}
2047 	wpabuf_free(decrypted);
2048 
2049 	wps->state = SEND_M6;
2050 	return WPS_CONTINUE;
2051 }
2052 
2053 
wps_sta_cred_cb(struct wps_data * wps)2054 static void wps_sta_cred_cb(struct wps_data *wps)
2055 {
2056 	/*
2057 	 * Update credential to only include a single authentication and
2058 	 * encryption type in case the AP configuration includes more than one
2059 	 * option.
2060 	 */
2061 	if (wps->cred.auth_type & WPS_AUTH_WPA2PSK)
2062 		wps->cred.auth_type = WPS_AUTH_WPA2PSK;
2063 	else if (wps->cred.auth_type & WPS_AUTH_WPAPSK)
2064 		wps->cred.auth_type = WPS_AUTH_WPAPSK;
2065 	if (wps->cred.encr_type & WPS_ENCR_AES)
2066 		wps->cred.encr_type = WPS_ENCR_AES;
2067 	else if (wps->cred.encr_type & WPS_ENCR_TKIP)
2068 		wps->cred.encr_type = WPS_ENCR_TKIP;
2069 	wpa_printf(MSG_DEBUG, "WPS: Update local configuration based on the "
2070 		   "AP configuration");
2071 	if (wps->wps->cred_cb)
2072 		wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
2073 }
2074 
2075 
wps_process_ap_settings_r(struct wps_data * wps,struct wps_parse_attr * attr)2076 static int wps_process_ap_settings_r(struct wps_data *wps,
2077 				     struct wps_parse_attr *attr)
2078 {
2079 	if (wps->wps->ap)
2080 		return 0;
2081 
2082 	/* AP Settings Attributes in M7 when Enrollee is an AP */
2083 	if (wps_process_ap_settings(attr, &wps->cred) < 0)
2084 		return -1;
2085 
2086 	wpa_printf(MSG_INFO, "WPS: Received old AP configuration from AP");
2087 
2088 #if 0
2089 	/*
2090 	 * TODO: Provide access to AP settings and allow changes before sending
2091 	 * out M8. For now, just copy the settings unchanged into M8.
2092 	 */
2093 
2094 	return 0;
2095 #else
2096 	/*
2097 	 * For now, use the AP PIN only to receive the current AP settings,
2098 	 * not to reconfigure the AP.
2099 	 */
2100 	wps_sta_cred_cb(wps);
2101 	return 1;
2102 #endif
2103 }
2104 
2105 
wps_process_m7(struct wps_data * wps,const struct wpabuf * msg,struct wps_parse_attr * attr)2106 static enum wps_process_res wps_process_m7(struct wps_data *wps,
2107 					   const struct wpabuf *msg,
2108 					   struct wps_parse_attr *attr)
2109 {
2110 	struct wpabuf *decrypted;
2111 	struct wps_parse_attr eattr;
2112 
2113 	wpa_printf(MSG_DEBUG, "WPS: Received M7");
2114 
2115 	if (wps->state != RECV_M7) {
2116 		wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
2117 			   "receiving M7", wps->state);
2118 		wps->state = SEND_WSC_NACK;
2119 		return WPS_CONTINUE;
2120 	}
2121 
2122 	if (wps->pbc && wps->wps->registrar->force_pbc_overlap) {
2123 		wpa_printf(MSG_DEBUG, "WPS: Reject negotiation due to PBC "
2124 			   "session overlap");
2125 		wps->state = SEND_WSC_NACK;
2126 		wps->config_error = WPS_CFG_MULTIPLE_PBC_DETECTED;
2127 		return WPS_CONTINUE;
2128 	}
2129 
2130 	if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
2131 	    wps_process_authenticator(wps, attr->authenticator, msg)) {
2132 		wps->state = SEND_WSC_NACK;
2133 		return WPS_CONTINUE;
2134 	}
2135 
2136 	decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
2137 					      attr->encr_settings_len);
2138 	if (decrypted == NULL) {
2139 		wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
2140 			   "Settings attribute");
2141 		wps->state = SEND_WSC_NACK;
2142 		return WPS_CONTINUE;
2143 	}
2144 
2145 	wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
2146 		   "attribute");
2147 	if (wps_parse_msg(decrypted, &eattr) < 0 ||
2148 	    wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
2149 	    wps_process_e_snonce2(wps, eattr.e_snonce2) ||
2150 	    wps_process_ap_settings_r(wps, &eattr)) {
2151 		wpabuf_free(decrypted);
2152 		wps->state = SEND_WSC_NACK;
2153 		return WPS_CONTINUE;
2154 	}
2155 
2156 	wpabuf_free(decrypted);
2157 
2158 	wps->state = SEND_M8;
2159 	return WPS_CONTINUE;
2160 }
2161 
2162 
wps_process_wsc_msg(struct wps_data * wps,const struct wpabuf * msg)2163 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
2164 						const struct wpabuf *msg)
2165 {
2166 	struct wps_parse_attr attr;
2167 	enum wps_process_res ret = WPS_CONTINUE;
2168 
2169 	wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
2170 
2171 	if (wps_parse_msg(msg, &attr) < 0)
2172 		return WPS_FAILURE;
2173 
2174 	if (!wps_version_supported(attr.version)) {
2175 		wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
2176 			   attr.version ? *attr.version : 0);
2177 		return WPS_FAILURE;
2178 	}
2179 
2180 	if (attr.msg_type == NULL) {
2181 		wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
2182 		return WPS_FAILURE;
2183 	}
2184 
2185 	if (*attr.msg_type != WPS_M1 &&
2186 	    (attr.registrar_nonce == NULL ||
2187 	     os_memcmp(wps->nonce_r, attr.registrar_nonce,
2188 		       WPS_NONCE_LEN != 0))) {
2189 		wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
2190 		return WPS_FAILURE;
2191 	}
2192 
2193 	switch (*attr.msg_type) {
2194 	case WPS_M1:
2195 #ifdef CONFIG_WPS_UPNP
2196 		if (wps->wps->wps_upnp && attr.mac_addr) {
2197 			/* Remove old pending messages when starting new run */
2198 			wps_free_pending_msgs(wps->wps->upnp_msgs);
2199 			wps->wps->upnp_msgs = NULL;
2200 
2201 			upnp_wps_device_send_wlan_event(
2202 				wps->wps->wps_upnp, attr.mac_addr,
2203 				UPNP_WPS_WLANEVENT_TYPE_EAP, msg);
2204 		}
2205 #endif /* CONFIG_WPS_UPNP */
2206 		ret = wps_process_m1(wps, &attr);
2207 		break;
2208 	case WPS_M3:
2209 		ret = wps_process_m3(wps, msg, &attr);
2210 		if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
2211 			wps_fail_event(wps->wps, WPS_M3);
2212 		break;
2213 	case WPS_M5:
2214 		ret = wps_process_m5(wps, msg, &attr);
2215 		if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
2216 			wps_fail_event(wps->wps, WPS_M5);
2217 		break;
2218 	case WPS_M7:
2219 		ret = wps_process_m7(wps, msg, &attr);
2220 		if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
2221 			wps_fail_event(wps->wps, WPS_M7);
2222 		break;
2223 	default:
2224 		wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
2225 			   *attr.msg_type);
2226 		return WPS_FAILURE;
2227 	}
2228 
2229 	if (ret == WPS_CONTINUE) {
2230 		/* Save a copy of the last message for Authenticator derivation
2231 		 */
2232 		wpabuf_free(wps->last_msg);
2233 		wps->last_msg = wpabuf_dup(msg);
2234 	}
2235 
2236 	return ret;
2237 }
2238 
2239 
wps_process_wsc_ack(struct wps_data * wps,const struct wpabuf * msg)2240 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
2241 						const struct wpabuf *msg)
2242 {
2243 	struct wps_parse_attr attr;
2244 
2245 	wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
2246 
2247 	if (wps_parse_msg(msg, &attr) < 0)
2248 		return WPS_FAILURE;
2249 
2250 	if (!wps_version_supported(attr.version)) {
2251 		wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
2252 			   attr.version ? *attr.version : 0);
2253 		return WPS_FAILURE;
2254 	}
2255 
2256 	if (attr.msg_type == NULL) {
2257 		wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
2258 		return WPS_FAILURE;
2259 	}
2260 
2261 	if (*attr.msg_type != WPS_WSC_ACK) {
2262 		wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
2263 			   *attr.msg_type);
2264 		return WPS_FAILURE;
2265 	}
2266 
2267 #ifdef CONFIG_WPS_UPNP
2268 	if (wps->wps->wps_upnp && wps->ext_reg && wps->state == RECV_M2D_ACK &&
2269 	    upnp_wps_subscribers(wps->wps->wps_upnp)) {
2270 		if (wps->wps->upnp_msgs)
2271 			return WPS_CONTINUE;
2272 		wpa_printf(MSG_DEBUG, "WPS: Wait for response from an "
2273 			   "external Registrar");
2274 		return WPS_PENDING;
2275 	}
2276 #endif /* CONFIG_WPS_UPNP */
2277 
2278 	if (attr.registrar_nonce == NULL ||
2279 	    os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
2280 	{
2281 		wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
2282 		return WPS_FAILURE;
2283 	}
2284 
2285 	if (attr.enrollee_nonce == NULL ||
2286 	    os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
2287 		wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
2288 		return WPS_FAILURE;
2289 	}
2290 
2291 	if (wps->state == RECV_M2D_ACK) {
2292 #ifdef CONFIG_WPS_UPNP
2293 		if (wps->wps->wps_upnp &&
2294 		    upnp_wps_subscribers(wps->wps->wps_upnp)) {
2295 			if (wps->wps->upnp_msgs)
2296 				return WPS_CONTINUE;
2297 			if (wps->ext_reg == 0)
2298 				wps->ext_reg = 1;
2299 			wpa_printf(MSG_DEBUG, "WPS: Wait for response from an "
2300 				   "external Registrar");
2301 			return WPS_PENDING;
2302 		}
2303 #endif /* CONFIG_WPS_UPNP */
2304 
2305 		wpa_printf(MSG_DEBUG, "WPS: No more registrars available - "
2306 			   "terminate negotiation");
2307 	}
2308 
2309 	return WPS_FAILURE;
2310 }
2311 
2312 
wps_process_wsc_nack(struct wps_data * wps,const struct wpabuf * msg)2313 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
2314 						 const struct wpabuf *msg)
2315 {
2316 	struct wps_parse_attr attr;
2317 	int old_state;
2318 
2319 	wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
2320 
2321 	old_state = wps->state;
2322 	wps->state = SEND_WSC_NACK;
2323 
2324 	if (wps_parse_msg(msg, &attr) < 0)
2325 		return WPS_FAILURE;
2326 
2327 	if (!wps_version_supported(attr.version)) {
2328 		wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
2329 			   attr.version ? *attr.version : 0);
2330 		return WPS_FAILURE;
2331 	}
2332 
2333 	if (attr.msg_type == NULL) {
2334 		wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
2335 		return WPS_FAILURE;
2336 	}
2337 
2338 	if (*attr.msg_type != WPS_WSC_NACK) {
2339 		wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
2340 			   *attr.msg_type);
2341 		return WPS_FAILURE;
2342 	}
2343 
2344 #ifdef CONFIG_WPS_UPNP
2345 	if (wps->wps->wps_upnp && wps->ext_reg) {
2346 		wpa_printf(MSG_DEBUG, "WPS: Negotiation using external "
2347 			   "Registrar terminated by the Enrollee");
2348 		return WPS_FAILURE;
2349 	}
2350 #endif /* CONFIG_WPS_UPNP */
2351 
2352 	if (attr.registrar_nonce == NULL ||
2353 	    os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
2354 	{
2355 		wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
2356 		return WPS_FAILURE;
2357 	}
2358 
2359 	if (attr.enrollee_nonce == NULL ||
2360 	    os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
2361 		wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
2362 		return WPS_FAILURE;
2363 	}
2364 
2365 	if (attr.config_error == NULL) {
2366 		wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
2367 			   "in WSC_NACK");
2368 		return WPS_FAILURE;
2369 	}
2370 
2371 	wpa_printf(MSG_DEBUG, "WPS: Enrollee terminated negotiation with "
2372 		   "Configuration Error %d", WPA_GET_BE16(attr.config_error));
2373 
2374 	switch (old_state) {
2375 	case RECV_M3:
2376 		wps_fail_event(wps->wps, WPS_M2);
2377 		break;
2378 	case RECV_M5:
2379 		wps_fail_event(wps->wps, WPS_M4);
2380 		break;
2381 	case RECV_M7:
2382 		wps_fail_event(wps->wps, WPS_M6);
2383 		break;
2384 	case RECV_DONE:
2385 		wps_fail_event(wps->wps, WPS_M8);
2386 		break;
2387 	default:
2388 		break;
2389 	}
2390 
2391 	return WPS_FAILURE;
2392 }
2393 
2394 
wps_process_wsc_done(struct wps_data * wps,const struct wpabuf * msg)2395 static enum wps_process_res wps_process_wsc_done(struct wps_data *wps,
2396 						 const struct wpabuf *msg)
2397 {
2398 	struct wps_parse_attr attr;
2399 
2400 	wpa_printf(MSG_DEBUG, "WPS: Received WSC_Done");
2401 
2402 	if (wps->state != RECV_DONE &&
2403 	    (!wps->wps->wps_upnp || !wps->ext_reg)) {
2404 		wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
2405 			   "receiving WSC_Done", wps->state);
2406 		return WPS_FAILURE;
2407 	}
2408 
2409 	if (wps_parse_msg(msg, &attr) < 0)
2410 		return WPS_FAILURE;
2411 
2412 	if (!wps_version_supported(attr.version)) {
2413 		wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
2414 			   attr.version ? *attr.version : 0);
2415 		return WPS_FAILURE;
2416 	}
2417 
2418 	if (attr.msg_type == NULL) {
2419 		wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
2420 		return WPS_FAILURE;
2421 	}
2422 
2423 	if (*attr.msg_type != WPS_WSC_DONE) {
2424 		wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
2425 			   *attr.msg_type);
2426 		return WPS_FAILURE;
2427 	}
2428 
2429 #ifdef CONFIG_WPS_UPNP
2430 	if (wps->wps->wps_upnp && wps->ext_reg) {
2431 		wpa_printf(MSG_DEBUG, "WPS: Negotiation using external "
2432 			   "Registrar completed successfully");
2433 		return WPS_DONE;
2434 	}
2435 #endif /* CONFIG_WPS_UPNP */
2436 
2437 	if (attr.registrar_nonce == NULL ||
2438 	    os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
2439 	{
2440 		wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
2441 		return WPS_FAILURE;
2442 	}
2443 
2444 	if (attr.enrollee_nonce == NULL ||
2445 	    os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
2446 		wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
2447 		return WPS_FAILURE;
2448 	}
2449 
2450 	wpa_printf(MSG_DEBUG, "WPS: Negotiation completed successfully");
2451 
2452 	if (wps->wps->wps_state == WPS_STATE_NOT_CONFIGURED && wps->new_psk &&
2453 	    wps->wps->ap && !wps->wps->registrar->disable_auto_conf) {
2454 		struct wps_credential cred;
2455 
2456 		wpa_printf(MSG_DEBUG, "WPS: Moving to Configured state based "
2457 			   "on first Enrollee connection");
2458 
2459 		os_memset(&cred, 0, sizeof(cred));
2460 		os_memcpy(cred.ssid, wps->wps->ssid, wps->wps->ssid_len);
2461 		cred.ssid_len = wps->wps->ssid_len;
2462 		cred.auth_type = WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK;
2463 		cred.encr_type = WPS_ENCR_TKIP | WPS_ENCR_AES;
2464 		os_memcpy(cred.key, wps->new_psk, wps->new_psk_len);
2465 		cred.key_len = wps->new_psk_len;
2466 
2467 		wps->wps->wps_state = WPS_STATE_CONFIGURED;
2468 		wpa_hexdump_ascii_key(MSG_DEBUG,
2469 				      "WPS: Generated random passphrase",
2470 				      wps->new_psk, wps->new_psk_len);
2471 		if (wps->wps->cred_cb)
2472 			wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
2473 
2474 		os_free(wps->new_psk);
2475 		wps->new_psk = NULL;
2476 	}
2477 
2478 	if (!wps->wps->ap)
2479 		wps_sta_cred_cb(wps);
2480 
2481 	if (wps->new_psk) {
2482 		if (wps_cb_new_psk(wps->wps->registrar, wps->mac_addr_e,
2483 				   wps->new_psk, wps->new_psk_len)) {
2484 			wpa_printf(MSG_DEBUG, "WPS: Failed to configure the "
2485 				   "new PSK");
2486 		}
2487 		os_free(wps->new_psk);
2488 		wps->new_psk = NULL;
2489 	}
2490 
2491 	wps_cb_reg_success(wps->wps->registrar, wps->mac_addr_e, wps->uuid_e);
2492 
2493 	if (wps->pbc) {
2494 		wps_registrar_remove_pbc_session(wps->wps->registrar,
2495 						 wps->mac_addr_e, wps->uuid_e);
2496 		wps_registrar_pbc_completed(wps->wps->registrar);
2497 	} else {
2498 		wps_registrar_pin_completed(wps->wps->registrar);
2499 	}
2500 
2501 	wps_success_event(wps->wps);
2502 
2503 	return WPS_DONE;
2504 }
2505 
2506 
wps_registrar_process_msg(struct wps_data * wps,enum wsc_op_code op_code,const struct wpabuf * msg)2507 enum wps_process_res wps_registrar_process_msg(struct wps_data *wps,
2508 					       enum wsc_op_code op_code,
2509 					       const struct wpabuf *msg)
2510 {
2511 	enum wps_process_res ret;
2512 
2513 	wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
2514 		   "op_code=%d)",
2515 		   (unsigned long) wpabuf_len(msg), op_code);
2516 
2517 #ifdef CONFIG_WPS_UPNP
2518 	if (wps->wps->wps_upnp && op_code == WSC_MSG && wps->ext_reg == 1) {
2519 		struct wps_parse_attr attr;
2520 		if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type &&
2521 		    *attr.msg_type == WPS_M3)
2522 			wps->ext_reg = 2; /* past M2/M2D phase */
2523 	}
2524 	if (wps->ext_reg > 1)
2525 		wps_registrar_free_pending_m2(wps->wps);
2526 	if (wps->wps->wps_upnp && wps->ext_reg &&
2527 	    wps->wps->upnp_msgs == NULL &&
2528 	    (op_code == WSC_MSG || op_code == WSC_Done || op_code == WSC_NACK))
2529 	{
2530 		struct wps_parse_attr attr;
2531 		int type;
2532 		if (wps_parse_msg(msg, &attr) < 0 || attr.msg_type == NULL)
2533 			type = -1;
2534 		else
2535 			type = *attr.msg_type;
2536 		wpa_printf(MSG_DEBUG, "WPS: Sending received message (type %d)"
2537 			   " to external Registrar for processing", type);
2538 		upnp_wps_device_send_wlan_event(wps->wps->wps_upnp,
2539 						wps->mac_addr_e,
2540 						UPNP_WPS_WLANEVENT_TYPE_EAP,
2541 						msg);
2542 		if (op_code == WSC_MSG)
2543 			return WPS_PENDING;
2544 	} else if (wps->wps->wps_upnp && wps->ext_reg && op_code == WSC_MSG) {
2545 		wpa_printf(MSG_DEBUG, "WPS: Skip internal processing - using "
2546 			   "external Registrar");
2547 		return WPS_CONTINUE;
2548 	}
2549 #endif /* CONFIG_WPS_UPNP */
2550 
2551 	switch (op_code) {
2552 	case WSC_MSG:
2553 		return wps_process_wsc_msg(wps, msg);
2554 	case WSC_ACK:
2555 		return wps_process_wsc_ack(wps, msg);
2556 	case WSC_NACK:
2557 		return wps_process_wsc_nack(wps, msg);
2558 	case WSC_Done:
2559 		ret = wps_process_wsc_done(wps, msg);
2560 		if (ret == WPS_FAILURE) {
2561 			wps->state = SEND_WSC_NACK;
2562 			wps_fail_event(wps->wps, WPS_WSC_DONE);
2563 		}
2564 		return ret;
2565 	default:
2566 		wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
2567 		return WPS_FAILURE;
2568 	}
2569 }
2570 
2571 
wps_registrar_update_ie(struct wps_registrar * reg)2572 int wps_registrar_update_ie(struct wps_registrar *reg)
2573 {
2574 	return wps_set_ie(reg);
2575 }
2576 
2577 
wps_registrar_set_selected_timeout(void * eloop_ctx,void * timeout_ctx)2578 static void wps_registrar_set_selected_timeout(void *eloop_ctx,
2579 					       void *timeout_ctx)
2580 {
2581 	struct wps_registrar *reg = eloop_ctx;
2582 
2583 	wpa_printf(MSG_DEBUG, "WPS: SetSelectedRegistrar timed out - "
2584 		   "unselect Registrar");
2585 	reg->selected_registrar = 0;
2586 	reg->pbc = 0;
2587 	reg->sel_reg_dev_password_id_override = -1;
2588 	reg->sel_reg_config_methods_override = -1;
2589 	wps_set_ie(reg);
2590 }
2591 
2592 
2593 /**
2594  * wps_registrar_set_selected_registrar - Notification of SetSelectedRegistrar
2595  * @reg: Registrar data from wps_registrar_init()
2596  * @msg: Received message from SetSelectedRegistrar
2597  * Returns: 0 on success, -1 on failure
2598  *
2599  * This function is called when an AP receives a SetSelectedRegistrar UPnP
2600  * message.
2601  */
wps_registrar_set_selected_registrar(struct wps_registrar * reg,const struct wpabuf * msg)2602 int wps_registrar_set_selected_registrar(struct wps_registrar *reg,
2603 					 const struct wpabuf *msg)
2604 {
2605 	struct wps_parse_attr attr;
2606 
2607 	wpa_hexdump_buf(MSG_MSGDUMP, "WPS: SetSelectedRegistrar attributes",
2608 			msg);
2609 
2610 	if (wps_parse_msg(msg, &attr) < 0)
2611 		return -1;
2612 	if (!wps_version_supported(attr.version)) {
2613 		wpa_printf(MSG_DEBUG, "WPS: Unsupported SetSelectedRegistrar "
2614 			   "version 0x%x", attr.version ? *attr.version : 0);
2615 		return -1;
2616 	}
2617 
2618 	if (attr.selected_registrar == NULL ||
2619 	    *attr.selected_registrar == 0) {
2620 		wpa_printf(MSG_DEBUG, "WPS: SetSelectedRegistrar: Disable "
2621 			   "Selected Registrar");
2622 		eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg,
2623 				     NULL);
2624 		wps_registrar_set_selected_timeout(reg, NULL);
2625 		return 0;
2626 	}
2627 
2628 	reg->selected_registrar = 1;
2629 	reg->sel_reg_dev_password_id_override = attr.dev_password_id ?
2630 		WPA_GET_BE16(attr.dev_password_id) : DEV_PW_DEFAULT;
2631 	reg->sel_reg_config_methods_override = attr.sel_reg_config_methods ?
2632 		WPA_GET_BE16(attr.sel_reg_config_methods) : -1;
2633 	wps_set_ie(reg);
2634 
2635 	eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg, NULL);
2636 	eloop_register_timeout(WPS_PBC_WALK_TIME, 0,
2637 			       wps_registrar_set_selected_timeout,
2638 			       reg, NULL);
2639 	return 0;
2640 }
2641