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(®->wps->dev, probe) ||
835 wps_build_probe_config_methods(reg, probe) ||
836 wps_build_rf_bands(®->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