1 /*
2 * Wi-Fi Protected Setup - Enrollee
3 * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "crypto/crypto.h"
13 #include "crypto/sha256.h"
14 #include "crypto/random.h"
15 #include "wps_i.h"
16 #include "wps_dev_attr.h"
17
18
wps_build_wps_state(struct wps_data * wps,struct wpabuf * msg)19 static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg)
20 {
21 u8 state;
22 if (wps->wps->ap)
23 state = wps->wps->wps_state;
24 else
25 state = WPS_STATE_NOT_CONFIGURED;
26 wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)",
27 state);
28 wpabuf_put_be16(msg, ATTR_WPS_STATE);
29 wpabuf_put_be16(msg, 1);
30 wpabuf_put_u8(msg, state);
31 return 0;
32 }
33
34
wps_build_e_hash(struct wps_data * wps,struct wpabuf * msg)35 static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg)
36 {
37 u8 *hash;
38 const u8 *addr[4];
39 size_t len[4];
40
41 if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0)
42 return -1;
43 wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN);
44 wpa_hexdump(MSG_DEBUG, "WPS: E-S2",
45 wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN);
46
47 if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) {
48 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for "
49 "E-Hash derivation");
50 return -1;
51 }
52
53 wpa_printf(MSG_DEBUG, "WPS: * E-Hash1");
54 wpabuf_put_be16(msg, ATTR_E_HASH1);
55 wpabuf_put_be16(msg, SHA256_MAC_LEN);
56 hash = wpabuf_put(msg, SHA256_MAC_LEN);
57 /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */
58 addr[0] = wps->snonce;
59 len[0] = WPS_SECRET_NONCE_LEN;
60 addr[1] = wps->psk1;
61 len[1] = WPS_PSK_LEN;
62 addr[2] = wpabuf_head(wps->dh_pubkey_e);
63 len[2] = wpabuf_len(wps->dh_pubkey_e);
64 addr[3] = wpabuf_head(wps->dh_pubkey_r);
65 len[3] = wpabuf_len(wps->dh_pubkey_r);
66 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
67 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN);
68
69 wpa_printf(MSG_DEBUG, "WPS: * E-Hash2");
70 wpabuf_put_be16(msg, ATTR_E_HASH2);
71 wpabuf_put_be16(msg, SHA256_MAC_LEN);
72 hash = wpabuf_put(msg, SHA256_MAC_LEN);
73 /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */
74 addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN;
75 addr[1] = wps->psk2;
76 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
77 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN);
78
79 return 0;
80 }
81
82
wps_build_e_snonce1(struct wps_data * wps,struct wpabuf * msg)83 static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg)
84 {
85 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1");
86 wpabuf_put_be16(msg, ATTR_E_SNONCE1);
87 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
88 wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN);
89 return 0;
90 }
91
92
wps_build_e_snonce2(struct wps_data * wps,struct wpabuf * msg)93 static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg)
94 {
95 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2");
96 wpabuf_put_be16(msg, ATTR_E_SNONCE2);
97 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
98 wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN,
99 WPS_SECRET_NONCE_LEN);
100 return 0;
101 }
102
103
wps_build_m1(struct wps_data * wps)104 static struct wpabuf * wps_build_m1(struct wps_data *wps)
105 {
106 struct wpabuf *msg;
107 u16 config_methods;
108
109 if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0)
110 return NULL;
111 wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
112 wps->nonce_e, WPS_NONCE_LEN);
113
114 wpa_printf(MSG_DEBUG, "WPS: Building Message M1");
115 msg = wpabuf_alloc(1000);
116 if (msg == NULL)
117 return NULL;
118
119 config_methods = wps->wps->config_methods;
120 if (wps->wps->ap && !wps->pbc_in_m1 &&
121 (wps->dev_password_len != 0 ||
122 (config_methods & WPS_CONFIG_DISPLAY))) {
123 /*
124 * These are the methods that the AP supports as an Enrollee
125 * for adding external Registrars, so remove PushButton.
126 *
127 * As a workaround for Windows 7 mechanism for probing WPS
128 * capabilities from M1, leave PushButton option if no PIN
129 * method is available or if WPS configuration enables PBC
130 * workaround.
131 */
132 config_methods &= ~WPS_CONFIG_PUSHBUTTON;
133 #ifdef CONFIG_WPS2
134 config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON |
135 WPS_CONFIG_PHY_PUSHBUTTON);
136 #endif /* CONFIG_WPS2 */
137 }
138
139 if (wps_build_version(msg) ||
140 wps_build_msg_type(msg, WPS_M1) ||
141 wps_build_uuid_e(msg, wps->uuid_e) ||
142 wps_build_mac_addr(msg, wps->mac_addr_e) ||
143 wps_build_enrollee_nonce(wps, msg) ||
144 wps_build_public_key(wps, msg) ||
145 wps_build_auth_type_flags(wps, msg) ||
146 wps_build_encr_type_flags(wps, msg) ||
147 wps_build_conn_type_flags(wps, msg) ||
148 wps_build_config_methods(msg, config_methods) ||
149 wps_build_wps_state(wps, msg) ||
150 wps_build_device_attrs(&wps->wps->dev, msg) ||
151 wps_build_rf_bands(&wps->wps->dev, msg,
152 wps->wps->rf_band_cb(wps->wps->cb_ctx)) ||
153 wps_build_assoc_state(wps, msg) ||
154 wps_build_dev_password_id(msg, wps->dev_pw_id) ||
155 wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
156 wps_build_os_version(&wps->wps->dev, msg) ||
157 wps_build_wfa_ext(msg, 0, NULL, 0) ||
158 wps_build_vendor_ext_m1(&wps->wps->dev, msg)) {
159 wpabuf_free(msg);
160 return NULL;
161 }
162
163 wps->state = RECV_M2;
164 return msg;
165 }
166
167
wps_build_m3(struct wps_data * wps)168 static struct wpabuf * wps_build_m3(struct wps_data *wps)
169 {
170 struct wpabuf *msg;
171
172 wpa_printf(MSG_DEBUG, "WPS: Building Message M3");
173
174 if (wps->dev_password == NULL) {
175 wpa_printf(MSG_DEBUG, "WPS: No Device Password available");
176 return NULL;
177 }
178 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
179
180 msg = wpabuf_alloc(1000);
181 if (msg == NULL)
182 return NULL;
183
184 if (wps_build_version(msg) ||
185 wps_build_msg_type(msg, WPS_M3) ||
186 wps_build_registrar_nonce(wps, msg) ||
187 wps_build_e_hash(wps, msg) ||
188 wps_build_wfa_ext(msg, 0, NULL, 0) ||
189 wps_build_authenticator(wps, msg)) {
190 wpabuf_free(msg);
191 return NULL;
192 }
193
194 wps->state = RECV_M4;
195 return msg;
196 }
197
198
wps_build_m5(struct wps_data * wps)199 static struct wpabuf * wps_build_m5(struct wps_data *wps)
200 {
201 struct wpabuf *msg, *plain;
202
203 wpa_printf(MSG_DEBUG, "WPS: Building Message M5");
204
205 plain = wpabuf_alloc(200);
206 if (plain == NULL)
207 return NULL;
208
209 msg = wpabuf_alloc(1000);
210 if (msg == NULL) {
211 wpabuf_free(plain);
212 return NULL;
213 }
214
215 if (wps_build_version(msg) ||
216 wps_build_msg_type(msg, WPS_M5) ||
217 wps_build_registrar_nonce(wps, msg) ||
218 wps_build_e_snonce1(wps, plain) ||
219 wps_build_key_wrap_auth(wps, plain) ||
220 wps_build_encr_settings(wps, msg, plain) ||
221 wps_build_wfa_ext(msg, 0, NULL, 0) ||
222 wps_build_authenticator(wps, msg)) {
223 wpabuf_free(plain);
224 wpabuf_free(msg);
225 return NULL;
226 }
227 wpabuf_free(plain);
228
229 wps->state = RECV_M6;
230 return msg;
231 }
232
233
wps_build_cred_ssid(struct wps_data * wps,struct wpabuf * msg)234 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg)
235 {
236 wpa_printf(MSG_DEBUG, "WPS: * SSID");
237 wpabuf_put_be16(msg, ATTR_SSID);
238 wpabuf_put_be16(msg, wps->wps->ssid_len);
239 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len);
240 return 0;
241 }
242
243
wps_build_cred_auth_type(struct wps_data * wps,struct wpabuf * msg)244 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg)
245 {
246 u16 auth_type = wps->wps->auth_types;
247
248 /* Select the best authentication type */
249 if (auth_type & WPS_AUTH_WPA2PSK)
250 auth_type = WPS_AUTH_WPA2PSK;
251 else if (auth_type & WPS_AUTH_WPAPSK)
252 auth_type = WPS_AUTH_WPAPSK;
253 else if (auth_type & WPS_AUTH_OPEN)
254 auth_type = WPS_AUTH_OPEN;
255 else if (auth_type & WPS_AUTH_SHARED)
256 auth_type = WPS_AUTH_SHARED;
257
258 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", auth_type);
259 wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
260 wpabuf_put_be16(msg, 2);
261 wpabuf_put_be16(msg, auth_type);
262 return 0;
263 }
264
265
wps_build_cred_encr_type(struct wps_data * wps,struct wpabuf * msg)266 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg)
267 {
268 u16 encr_type = wps->wps->encr_types;
269
270 /* Select the best encryption type */
271 if (wps->wps->auth_types & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) {
272 if (encr_type & WPS_ENCR_AES)
273 encr_type = WPS_ENCR_AES;
274 else if (encr_type & WPS_ENCR_TKIP)
275 encr_type = WPS_ENCR_TKIP;
276 } else {
277 if (encr_type & WPS_ENCR_WEP)
278 encr_type = WPS_ENCR_WEP;
279 else if (encr_type & WPS_ENCR_NONE)
280 encr_type = WPS_ENCR_NONE;
281 }
282
283 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", encr_type);
284 wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
285 wpabuf_put_be16(msg, 2);
286 wpabuf_put_be16(msg, encr_type);
287 return 0;
288 }
289
290
wps_build_cred_network_key(struct wps_data * wps,struct wpabuf * msg)291 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg)
292 {
293 wpa_printf(MSG_DEBUG, "WPS: * Network Key");
294 wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
295 wpabuf_put_be16(msg, wps->wps->network_key_len);
296 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len);
297 return 0;
298 }
299
300
wps_build_cred_mac_addr(struct wps_data * wps,struct wpabuf * msg)301 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg)
302 {
303 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)");
304 wpabuf_put_be16(msg, ATTR_MAC_ADDR);
305 wpabuf_put_be16(msg, ETH_ALEN);
306 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN);
307 return 0;
308 }
309
310
wps_build_ap_settings(struct wps_data * wps,struct wpabuf * plain)311 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain)
312 {
313 if (wps->wps->ap_settings) {
314 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)");
315 wpabuf_put_data(plain, wps->wps->ap_settings,
316 wps->wps->ap_settings_len);
317 return 0;
318 }
319
320 return wps_build_cred_ssid(wps, plain) ||
321 wps_build_cred_mac_addr(wps, plain) ||
322 wps_build_cred_auth_type(wps, plain) ||
323 wps_build_cred_encr_type(wps, plain) ||
324 wps_build_cred_network_key(wps, plain);
325 }
326
327
wps_build_m7(struct wps_data * wps)328 static struct wpabuf * wps_build_m7(struct wps_data *wps)
329 {
330 struct wpabuf *msg, *plain;
331
332 wpa_printf(MSG_DEBUG, "WPS: Building Message M7");
333
334 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len);
335 if (plain == NULL)
336 return NULL;
337
338 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len);
339 if (msg == NULL) {
340 wpabuf_free(plain);
341 return NULL;
342 }
343
344 if (wps_build_version(msg) ||
345 wps_build_msg_type(msg, WPS_M7) ||
346 wps_build_registrar_nonce(wps, msg) ||
347 wps_build_e_snonce2(wps, plain) ||
348 (wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
349 wps_build_key_wrap_auth(wps, plain) ||
350 wps_build_encr_settings(wps, msg, plain) ||
351 wps_build_wfa_ext(msg, 0, NULL, 0) ||
352 wps_build_authenticator(wps, msg)) {
353 wpabuf_free(plain);
354 wpabuf_free(msg);
355 return NULL;
356 }
357 wpabuf_free(plain);
358
359 if (wps->wps->ap && wps->wps->registrar) {
360 /*
361 * If the Registrar is only learning our current configuration,
362 * it may not continue protocol run to successful completion.
363 * Store information here to make sure it remains available.
364 */
365 wps_device_store(wps->wps->registrar, &wps->peer_dev,
366 wps->uuid_r);
367 }
368
369 wps->state = RECV_M8;
370 return msg;
371 }
372
373
wps_build_wsc_done(struct wps_data * wps)374 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps)
375 {
376 struct wpabuf *msg;
377
378 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done");
379
380 msg = wpabuf_alloc(1000);
381 if (msg == NULL)
382 return NULL;
383
384 if (wps_build_version(msg) ||
385 wps_build_msg_type(msg, WPS_WSC_DONE) ||
386 wps_build_enrollee_nonce(wps, msg) ||
387 wps_build_registrar_nonce(wps, msg) ||
388 wps_build_wfa_ext(msg, 0, NULL, 0)) {
389 wpabuf_free(msg);
390 return NULL;
391 }
392
393 if (wps->wps->ap)
394 wps->state = RECV_ACK;
395 else {
396 wps_success_event(wps->wps, wps->peer_dev.mac_addr);
397 wps->state = WPS_FINISHED;
398 }
399 return msg;
400 }
401
402
wps_enrollee_get_msg(struct wps_data * wps,enum wsc_op_code * op_code)403 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps,
404 enum wsc_op_code *op_code)
405 {
406 struct wpabuf *msg;
407
408 switch (wps->state) {
409 case SEND_M1:
410 msg = wps_build_m1(wps);
411 *op_code = WSC_MSG;
412 break;
413 case SEND_M3:
414 msg = wps_build_m3(wps);
415 *op_code = WSC_MSG;
416 break;
417 case SEND_M5:
418 msg = wps_build_m5(wps);
419 *op_code = WSC_MSG;
420 break;
421 case SEND_M7:
422 msg = wps_build_m7(wps);
423 *op_code = WSC_MSG;
424 break;
425 case RECEIVED_M2D:
426 if (wps->wps->ap) {
427 msg = wps_build_wsc_nack(wps);
428 *op_code = WSC_NACK;
429 break;
430 }
431 msg = wps_build_wsc_ack(wps);
432 *op_code = WSC_ACK;
433 if (msg) {
434 /* Another M2/M2D may be received */
435 wps->state = RECV_M2;
436 }
437 break;
438 case SEND_WSC_NACK:
439 msg = wps_build_wsc_nack(wps);
440 *op_code = WSC_NACK;
441 break;
442 case WPS_MSG_DONE:
443 msg = wps_build_wsc_done(wps);
444 *op_code = WSC_Done;
445 break;
446 default:
447 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
448 "a message", wps->state);
449 msg = NULL;
450 break;
451 }
452
453 if (*op_code == WSC_MSG && msg) {
454 /* Save a copy of the last message for Authenticator derivation
455 */
456 wpabuf_free(wps->last_msg);
457 wps->last_msg = wpabuf_dup(msg);
458 }
459
460 return msg;
461 }
462
463
wps_process_registrar_nonce(struct wps_data * wps,const u8 * r_nonce)464 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
465 {
466 if (r_nonce == NULL) {
467 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
468 return -1;
469 }
470
471 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN);
472 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
473 wps->nonce_r, WPS_NONCE_LEN);
474
475 return 0;
476 }
477
478
wps_process_enrollee_nonce(struct wps_data * wps,const u8 * e_nonce)479 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
480 {
481 if (e_nonce == NULL) {
482 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
483 return -1;
484 }
485
486 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) {
487 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received");
488 return -1;
489 }
490
491 return 0;
492 }
493
494
wps_process_uuid_r(struct wps_data * wps,const u8 * uuid_r)495 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r)
496 {
497 if (uuid_r == NULL) {
498 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received");
499 return -1;
500 }
501
502 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN);
503 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
504
505 return 0;
506 }
507
508
wps_process_pubkey(struct wps_data * wps,const u8 * pk,size_t pk_len)509 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
510 size_t pk_len)
511 {
512 if (pk == NULL || pk_len == 0) {
513 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
514 return -1;
515 }
516
517 wpabuf_free(wps->dh_pubkey_r);
518 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len);
519 if (wps->dh_pubkey_r == NULL)
520 return -1;
521
522 if (wps_derive_keys(wps) < 0)
523 return -1;
524
525 return 0;
526 }
527
528
wps_process_r_hash1(struct wps_data * wps,const u8 * r_hash1)529 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1)
530 {
531 if (r_hash1 == NULL) {
532 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received");
533 return -1;
534 }
535
536 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN);
537 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN);
538
539 return 0;
540 }
541
542
wps_process_r_hash2(struct wps_data * wps,const u8 * r_hash2)543 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2)
544 {
545 if (r_hash2 == NULL) {
546 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received");
547 return -1;
548 }
549
550 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN);
551 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN);
552
553 return 0;
554 }
555
556
wps_process_r_snonce1(struct wps_data * wps,const u8 * r_snonce1)557 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1)
558 {
559 u8 hash[SHA256_MAC_LEN];
560 const u8 *addr[4];
561 size_t len[4];
562
563 if (r_snonce1 == NULL) {
564 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received");
565 return -1;
566 }
567
568 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1,
569 WPS_SECRET_NONCE_LEN);
570
571 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
572 addr[0] = r_snonce1;
573 len[0] = WPS_SECRET_NONCE_LEN;
574 addr[1] = wps->psk1;
575 len[1] = WPS_PSK_LEN;
576 addr[2] = wpabuf_head(wps->dh_pubkey_e);
577 len[2] = wpabuf_len(wps->dh_pubkey_e);
578 addr[3] = wpabuf_head(wps->dh_pubkey_r);
579 len[3] = wpabuf_len(wps->dh_pubkey_r);
580 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
581
582 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
583 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does "
584 "not match with the pre-committed value");
585 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
586 wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr);
587 return -1;
588 }
589
590 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first "
591 "half of the device password");
592
593 return 0;
594 }
595
596
wps_process_r_snonce2(struct wps_data * wps,const u8 * r_snonce2)597 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2)
598 {
599 u8 hash[SHA256_MAC_LEN];
600 const u8 *addr[4];
601 size_t len[4];
602
603 if (r_snonce2 == NULL) {
604 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received");
605 return -1;
606 }
607
608 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2,
609 WPS_SECRET_NONCE_LEN);
610
611 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
612 addr[0] = r_snonce2;
613 len[0] = WPS_SECRET_NONCE_LEN;
614 addr[1] = wps->psk2;
615 len[1] = WPS_PSK_LEN;
616 addr[2] = wpabuf_head(wps->dh_pubkey_e);
617 len[2] = wpabuf_len(wps->dh_pubkey_e);
618 addr[3] = wpabuf_head(wps->dh_pubkey_r);
619 len[3] = wpabuf_len(wps->dh_pubkey_r);
620 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
621
622 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
623 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does "
624 "not match with the pre-committed value");
625 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
626 wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr);
627 return -1;
628 }
629
630 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second "
631 "half of the device password");
632
633 return 0;
634 }
635
636
wps_process_cred_e(struct wps_data * wps,const u8 * cred,size_t cred_len,int wps2)637 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred,
638 size_t cred_len, int wps2)
639 {
640 struct wps_parse_attr attr;
641 struct wpabuf msg;
642 int ret = 0;
643
644 wpa_printf(MSG_DEBUG, "WPS: Received Credential");
645 os_memset(&wps->cred, 0, sizeof(wps->cred));
646 wpabuf_set(&msg, cred, cred_len);
647 if (wps_parse_msg(&msg, &attr) < 0 ||
648 wps_process_cred(&attr, &wps->cred))
649 return -1;
650
651 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
652 0) {
653 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential ("
654 MACSTR ") does not match with own address (" MACSTR
655 ")", MAC2STR(wps->cred.mac_addr),
656 MAC2STR(wps->wps->dev.mac_addr));
657 /*
658 * In theory, this could be consider fatal error, but there are
659 * number of deployed implementations using other address here
660 * due to unclarity in the specification. For interoperability
661 * reasons, allow this to be processed since we do not really
662 * use the MAC Address information for anything.
663 */
664 #ifdef CONFIG_WPS_STRICT
665 if (wps2) {
666 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect "
667 "MAC Address in AP Settings");
668 return -1;
669 }
670 #endif /* CONFIG_WPS_STRICT */
671 }
672
673 #ifdef CONFIG_WPS2
674 if (!(wps->cred.encr_type &
675 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) {
676 if (wps->cred.encr_type & WPS_ENCR_WEP) {
677 wpa_printf(MSG_INFO, "WPS: Reject Credential "
678 "due to WEP configuration");
679 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED;
680 return -2;
681 }
682
683 wpa_printf(MSG_INFO, "WPS: Reject Credential due to "
684 "invalid encr_type 0x%x", wps->cred.encr_type);
685 return -1;
686 }
687 #endif /* CONFIG_WPS2 */
688
689 if (wps->wps->cred_cb) {
690 wps->cred.cred_attr = cred - 4;
691 wps->cred.cred_attr_len = cred_len + 4;
692 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
693 wps->cred.cred_attr = NULL;
694 wps->cred.cred_attr_len = 0;
695 }
696
697 return ret;
698 }
699
700
wps_process_creds(struct wps_data * wps,const u8 * cred[],size_t cred_len[],size_t num_cred,int wps2)701 static int wps_process_creds(struct wps_data *wps, const u8 *cred[],
702 size_t cred_len[], size_t num_cred, int wps2)
703 {
704 size_t i;
705 int ok = 0;
706
707 if (wps->wps->ap)
708 return 0;
709
710 if (num_cred == 0) {
711 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes "
712 "received");
713 return -1;
714 }
715
716 for (i = 0; i < num_cred; i++) {
717 int res;
718 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2);
719 if (res == 0)
720 ok++;
721 else if (res == -2)
722 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped");
723 else
724 return -1;
725 }
726
727 if (ok == 0) {
728 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute "
729 "received");
730 return -1;
731 }
732
733 return 0;
734 }
735
736
wps_process_ap_settings_e(struct wps_data * wps,struct wps_parse_attr * attr,struct wpabuf * attrs,int wps2)737 static int wps_process_ap_settings_e(struct wps_data *wps,
738 struct wps_parse_attr *attr,
739 struct wpabuf *attrs, int wps2)
740 {
741 struct wps_credential cred;
742
743 if (!wps->wps->ap)
744 return 0;
745
746 if (wps_process_ap_settings(attr, &cred) < 0)
747 return -1;
748
749 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from "
750 "Registrar");
751
752 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
753 0) {
754 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings ("
755 MACSTR ") does not match with own address (" MACSTR
756 ")", MAC2STR(cred.mac_addr),
757 MAC2STR(wps->wps->dev.mac_addr));
758 /*
759 * In theory, this could be consider fatal error, but there are
760 * number of deployed implementations using other address here
761 * due to unclarity in the specification. For interoperability
762 * reasons, allow this to be processed since we do not really
763 * use the MAC Address information for anything.
764 */
765 #ifdef CONFIG_WPS_STRICT
766 if (wps2) {
767 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect "
768 "MAC Address in AP Settings");
769 return -1;
770 }
771 #endif /* CONFIG_WPS_STRICT */
772 }
773
774 #ifdef CONFIG_WPS2
775 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES)))
776 {
777 if (cred.encr_type & WPS_ENCR_WEP) {
778 wpa_printf(MSG_INFO, "WPS: Reject new AP settings "
779 "due to WEP configuration");
780 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED;
781 return -1;
782 }
783
784 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to "
785 "invalid encr_type 0x%x", cred.encr_type);
786 return -1;
787 }
788 #endif /* CONFIG_WPS2 */
789
790 #ifdef CONFIG_WPS_STRICT
791 if (wps2) {
792 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) ==
793 WPS_ENCR_TKIP ||
794 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
795 WPS_AUTH_WPAPSK) {
796 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 "
797 "AP Settings: WPA-Personal/TKIP only");
798 wps->error_indication =
799 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED;
800 return -1;
801 }
802 }
803 #endif /* CONFIG_WPS_STRICT */
804
805 #ifdef CONFIG_WPS2
806 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP)
807 {
808 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> "
809 "TKIP+AES");
810 cred.encr_type |= WPS_ENCR_AES;
811 }
812
813 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
814 WPS_AUTH_WPAPSK) {
815 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> "
816 "WPAPSK+WPA2PSK");
817 cred.auth_type |= WPS_AUTH_WPA2PSK;
818 }
819 #endif /* CONFIG_WPS2 */
820
821 if (wps->wps->cred_cb) {
822 cred.cred_attr = wpabuf_head(attrs);
823 cred.cred_attr_len = wpabuf_len(attrs);
824 wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
825 }
826
827 return 0;
828 }
829
830
wps_process_dev_pw_id(struct wps_data * wps,const u8 * dev_pw_id)831 static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id)
832 {
833 u16 id;
834
835 if (dev_pw_id == NULL) {
836 wpa_printf(MSG_DEBUG, "WPS: Device Password ID");
837 return -1;
838 }
839
840 id = WPA_GET_BE16(dev_pw_id);
841 if (wps->dev_pw_id == id) {
842 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id);
843 return 0;
844 }
845
846 #ifdef CONFIG_P2P
847 if ((id == DEV_PW_DEFAULT &&
848 wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) ||
849 (id == DEV_PW_REGISTRAR_SPECIFIED &&
850 wps->dev_pw_id == DEV_PW_DEFAULT)) {
851 /*
852 * Common P2P use cases indicate whether the PIN is from the
853 * client or GO using Device Password Id in M1/M2 in a way that
854 * does not look fully compliant with WSC specification. Anyway,
855 * this is deployed and needs to be allowed, so ignore changes
856 * between Registrar-Specified and Default PIN.
857 */
858 wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID "
859 "change");
860 return 0;
861 }
862 #endif /* CONFIG_P2P */
863
864 wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password "
865 "ID from %u to %u", wps->dev_pw_id, id);
866
867 if (wps->alt_dev_password && wps->alt_dev_pw_id == id) {
868 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password");
869 os_free(wps->dev_password);
870 wps->dev_pw_id = wps->alt_dev_pw_id;
871 wps->dev_password = wps->alt_dev_password;
872 wps->dev_password_len = wps->alt_dev_password_len;
873 wps->alt_dev_password = NULL;
874 wps->alt_dev_password_len = 0;
875 return 0;
876 }
877
878 return -1;
879 }
880
881
wps_process_m2(struct wps_data * wps,const struct wpabuf * msg,struct wps_parse_attr * attr)882 static enum wps_process_res wps_process_m2(struct wps_data *wps,
883 const struct wpabuf *msg,
884 struct wps_parse_attr *attr)
885 {
886 wpa_printf(MSG_DEBUG, "WPS: Received M2");
887
888 if (wps->state != RECV_M2) {
889 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
890 "receiving M2", wps->state);
891 wps->state = SEND_WSC_NACK;
892 return WPS_CONTINUE;
893 }
894
895 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
896 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
897 wps_process_uuid_r(wps, attr->uuid_r) ||
898 wps_process_dev_pw_id(wps, attr->dev_password_id)) {
899 wps->state = SEND_WSC_NACK;
900 return WPS_CONTINUE;
901 }
902
903 /*
904 * Stop here on an AP as an Enrollee if AP Setup is locked unless the
905 * special locked mode is used to allow protocol run up to M7 in order
906 * to support external Registrars that only learn the current AP
907 * configuration without changing it.
908 */
909 if (wps->wps->ap &&
910 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) ||
911 wps->dev_password == NULL)) {
912 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
913 "registration of a new Registrar");
914 wps->config_error = WPS_CFG_SETUP_LOCKED;
915 wps->state = SEND_WSC_NACK;
916 return WPS_CONTINUE;
917 }
918
919 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
920 wps_process_authenticator(wps, attr->authenticator, msg) ||
921 wps_process_device_attrs(&wps->peer_dev, attr)) {
922 wps->state = SEND_WSC_NACK;
923 return WPS_CONTINUE;
924 }
925
926 wps->state = SEND_M3;
927 return WPS_CONTINUE;
928 }
929
930
wps_process_m2d(struct wps_data * wps,struct wps_parse_attr * attr)931 static enum wps_process_res wps_process_m2d(struct wps_data *wps,
932 struct wps_parse_attr *attr)
933 {
934 wpa_printf(MSG_DEBUG, "WPS: Received M2D");
935
936 if (wps->state != RECV_M2) {
937 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
938 "receiving M2D", wps->state);
939 wps->state = SEND_WSC_NACK;
940 return WPS_CONTINUE;
941 }
942
943 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
944 attr->manufacturer, attr->manufacturer_len);
945 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
946 attr->model_name, attr->model_name_len);
947 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
948 attr->model_number, attr->model_number_len);
949 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
950 attr->serial_number, attr->serial_number_len);
951 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
952 attr->dev_name, attr->dev_name_len);
953
954 if (wps->wps->event_cb) {
955 union wps_event_data data;
956 struct wps_event_m2d *m2d = &data.m2d;
957 os_memset(&data, 0, sizeof(data));
958 if (attr->config_methods)
959 m2d->config_methods =
960 WPA_GET_BE16(attr->config_methods);
961 m2d->manufacturer = attr->manufacturer;
962 m2d->manufacturer_len = attr->manufacturer_len;
963 m2d->model_name = attr->model_name;
964 m2d->model_name_len = attr->model_name_len;
965 m2d->model_number = attr->model_number;
966 m2d->model_number_len = attr->model_number_len;
967 m2d->serial_number = attr->serial_number;
968 m2d->serial_number_len = attr->serial_number_len;
969 m2d->dev_name = attr->dev_name;
970 m2d->dev_name_len = attr->dev_name_len;
971 m2d->primary_dev_type = attr->primary_dev_type;
972 if (attr->config_error)
973 m2d->config_error =
974 WPA_GET_BE16(attr->config_error);
975 if (attr->dev_password_id)
976 m2d->dev_password_id =
977 WPA_GET_BE16(attr->dev_password_id);
978 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
979 }
980
981 wps->state = RECEIVED_M2D;
982 return WPS_CONTINUE;
983 }
984
985
wps_process_m4(struct wps_data * wps,const struct wpabuf * msg,struct wps_parse_attr * attr)986 static enum wps_process_res wps_process_m4(struct wps_data *wps,
987 const struct wpabuf *msg,
988 struct wps_parse_attr *attr)
989 {
990 struct wpabuf *decrypted;
991 struct wps_parse_attr eattr;
992
993 wpa_printf(MSG_DEBUG, "WPS: Received M4");
994
995 if (wps->state != RECV_M4) {
996 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
997 "receiving M4", wps->state);
998 wps->state = SEND_WSC_NACK;
999 return WPS_CONTINUE;
1000 }
1001
1002 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1003 wps_process_authenticator(wps, attr->authenticator, msg) ||
1004 wps_process_r_hash1(wps, attr->r_hash1) ||
1005 wps_process_r_hash2(wps, attr->r_hash2)) {
1006 wps->state = SEND_WSC_NACK;
1007 return WPS_CONTINUE;
1008 }
1009
1010 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1011 attr->encr_settings_len);
1012 if (decrypted == NULL) {
1013 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1014 "Settings attribute");
1015 wps->state = SEND_WSC_NACK;
1016 return WPS_CONTINUE;
1017 }
1018
1019 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) {
1020 wpabuf_free(decrypted);
1021 wps->state = SEND_WSC_NACK;
1022 return WPS_CONTINUE;
1023 }
1024
1025 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1026 "attribute");
1027 if (wps_parse_msg(decrypted, &eattr) < 0 ||
1028 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1029 wps_process_r_snonce1(wps, eattr.r_snonce1)) {
1030 wpabuf_free(decrypted);
1031 wps->state = SEND_WSC_NACK;
1032 return WPS_CONTINUE;
1033 }
1034 wpabuf_free(decrypted);
1035
1036 wps->state = SEND_M5;
1037 return WPS_CONTINUE;
1038 }
1039
1040
wps_process_m6(struct wps_data * wps,const struct wpabuf * msg,struct wps_parse_attr * attr)1041 static enum wps_process_res wps_process_m6(struct wps_data *wps,
1042 const struct wpabuf *msg,
1043 struct wps_parse_attr *attr)
1044 {
1045 struct wpabuf *decrypted;
1046 struct wps_parse_attr eattr;
1047
1048 wpa_printf(MSG_DEBUG, "WPS: Received M6");
1049
1050 if (wps->state != RECV_M6) {
1051 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1052 "receiving M6", wps->state);
1053 wps->state = SEND_WSC_NACK;
1054 return WPS_CONTINUE;
1055 }
1056
1057 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1058 wps_process_authenticator(wps, attr->authenticator, msg)) {
1059 wps->state = SEND_WSC_NACK;
1060 return WPS_CONTINUE;
1061 }
1062
1063 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1064 attr->encr_settings_len);
1065 if (decrypted == NULL) {
1066 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1067 "Settings attribute");
1068 wps->state = SEND_WSC_NACK;
1069 return WPS_CONTINUE;
1070 }
1071
1072 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) {
1073 wpabuf_free(decrypted);
1074 wps->state = SEND_WSC_NACK;
1075 return WPS_CONTINUE;
1076 }
1077
1078 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1079 "attribute");
1080 if (wps_parse_msg(decrypted, &eattr) < 0 ||
1081 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1082 wps_process_r_snonce2(wps, eattr.r_snonce2)) {
1083 wpabuf_free(decrypted);
1084 wps->state = SEND_WSC_NACK;
1085 return WPS_CONTINUE;
1086 }
1087 wpabuf_free(decrypted);
1088
1089 if (wps->wps->ap)
1090 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS,
1091 NULL);
1092
1093 wps->state = SEND_M7;
1094 return WPS_CONTINUE;
1095 }
1096
1097
wps_process_m8(struct wps_data * wps,const struct wpabuf * msg,struct wps_parse_attr * attr)1098 static enum wps_process_res wps_process_m8(struct wps_data *wps,
1099 const struct wpabuf *msg,
1100 struct wps_parse_attr *attr)
1101 {
1102 struct wpabuf *decrypted;
1103 struct wps_parse_attr eattr;
1104
1105 wpa_printf(MSG_DEBUG, "WPS: Received M8");
1106
1107 if (wps->state != RECV_M8) {
1108 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1109 "receiving M8", wps->state);
1110 wps->state = SEND_WSC_NACK;
1111 return WPS_CONTINUE;
1112 }
1113
1114 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1115 wps_process_authenticator(wps, attr->authenticator, msg)) {
1116 wps->state = SEND_WSC_NACK;
1117 return WPS_CONTINUE;
1118 }
1119
1120 if (wps->wps->ap && wps->wps->ap_setup_locked) {
1121 /*
1122 * Stop here if special ap_setup_locked == 2 mode allowed the
1123 * protocol to continue beyond M2. This allows ER to learn the
1124 * current AP settings without changing them.
1125 */
1126 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
1127 "registration of a new Registrar");
1128 wps->config_error = WPS_CFG_SETUP_LOCKED;
1129 wps->state = SEND_WSC_NACK;
1130 return WPS_CONTINUE;
1131 }
1132
1133 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1134 attr->encr_settings_len);
1135 if (decrypted == NULL) {
1136 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1137 "Settings attribute");
1138 wps->state = SEND_WSC_NACK;
1139 return WPS_CONTINUE;
1140 }
1141
1142 if (wps_validate_m8_encr(decrypted, wps->wps->ap,
1143 attr->version2 != NULL) < 0) {
1144 wpabuf_free(decrypted);
1145 wps->state = SEND_WSC_NACK;
1146 return WPS_CONTINUE;
1147 }
1148
1149 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1150 "attribute");
1151 if (wps_parse_msg(decrypted, &eattr) < 0 ||
1152 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1153 wps_process_creds(wps, eattr.cred, eattr.cred_len,
1154 eattr.num_cred, attr->version2 != NULL) ||
1155 wps_process_ap_settings_e(wps, &eattr, decrypted,
1156 attr->version2 != NULL)) {
1157 wpabuf_free(decrypted);
1158 wps->state = SEND_WSC_NACK;
1159 return WPS_CONTINUE;
1160 }
1161 wpabuf_free(decrypted);
1162
1163 wps->state = WPS_MSG_DONE;
1164 return WPS_CONTINUE;
1165 }
1166
1167
wps_process_wsc_msg(struct wps_data * wps,const struct wpabuf * msg)1168 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
1169 const struct wpabuf *msg)
1170 {
1171 struct wps_parse_attr attr;
1172 enum wps_process_res ret = WPS_CONTINUE;
1173
1174 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
1175
1176 if (wps_parse_msg(msg, &attr) < 0)
1177 return WPS_FAILURE;
1178
1179 if (attr.enrollee_nonce == NULL ||
1180 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) {
1181 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1182 return WPS_FAILURE;
1183 }
1184
1185 if (attr.msg_type == NULL) {
1186 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1187 wps->state = SEND_WSC_NACK;
1188 return WPS_CONTINUE;
1189 }
1190
1191 switch (*attr.msg_type) {
1192 case WPS_M2:
1193 if (wps_validate_m2(msg) < 0)
1194 return WPS_FAILURE;
1195 ret = wps_process_m2(wps, msg, &attr);
1196 break;
1197 case WPS_M2D:
1198 if (wps_validate_m2d(msg) < 0)
1199 return WPS_FAILURE;
1200 ret = wps_process_m2d(wps, &attr);
1201 break;
1202 case WPS_M4:
1203 if (wps_validate_m4(msg) < 0)
1204 return WPS_FAILURE;
1205 ret = wps_process_m4(wps, msg, &attr);
1206 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1207 wps_fail_event(wps->wps, WPS_M4, wps->config_error,
1208 wps->error_indication,
1209 wps->peer_dev.mac_addr);
1210 break;
1211 case WPS_M6:
1212 if (wps_validate_m6(msg) < 0)
1213 return WPS_FAILURE;
1214 ret = wps_process_m6(wps, msg, &attr);
1215 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1216 wps_fail_event(wps->wps, WPS_M6, wps->config_error,
1217 wps->error_indication,
1218 wps->peer_dev.mac_addr);
1219 break;
1220 case WPS_M8:
1221 if (wps_validate_m8(msg) < 0)
1222 return WPS_FAILURE;
1223 ret = wps_process_m8(wps, msg, &attr);
1224 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1225 wps_fail_event(wps->wps, WPS_M8, wps->config_error,
1226 wps->error_indication,
1227 wps->peer_dev.mac_addr);
1228 break;
1229 default:
1230 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1231 *attr.msg_type);
1232 return WPS_FAILURE;
1233 }
1234
1235 /*
1236 * Save a copy of the last message for Authenticator derivation if we
1237 * are continuing. However, skip M2D since it is not authenticated and
1238 * neither is the ACK/NACK response frame. This allows the possibly
1239 * following M2 to be processed correctly by using the previously sent
1240 * M1 in Authenticator derivation.
1241 */
1242 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) {
1243 /* Save a copy of the last message for Authenticator derivation
1244 */
1245 wpabuf_free(wps->last_msg);
1246 wps->last_msg = wpabuf_dup(msg);
1247 }
1248
1249 return ret;
1250 }
1251
1252
wps_process_wsc_ack(struct wps_data * wps,const struct wpabuf * msg)1253 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
1254 const struct wpabuf *msg)
1255 {
1256 struct wps_parse_attr attr;
1257
1258 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1259
1260 if (wps_parse_msg(msg, &attr) < 0)
1261 return WPS_FAILURE;
1262
1263 if (attr.msg_type == NULL) {
1264 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1265 return WPS_FAILURE;
1266 }
1267
1268 if (*attr.msg_type != WPS_WSC_ACK) {
1269 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1270 *attr.msg_type);
1271 return WPS_FAILURE;
1272 }
1273
1274 if (attr.registrar_nonce == NULL ||
1275 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0)
1276 {
1277 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1278 return WPS_FAILURE;
1279 }
1280
1281 if (attr.enrollee_nonce == NULL ||
1282 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) {
1283 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1284 return WPS_FAILURE;
1285 }
1286
1287 if (wps->state == RECV_ACK && wps->wps->ap) {
1288 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
1289 "completed successfully");
1290 wps_success_event(wps->wps, wps->peer_dev.mac_addr);
1291 wps->state = WPS_FINISHED;
1292 return WPS_DONE;
1293 }
1294
1295 return WPS_FAILURE;
1296 }
1297
1298
wps_process_wsc_nack(struct wps_data * wps,const struct wpabuf * msg)1299 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1300 const struct wpabuf *msg)
1301 {
1302 struct wps_parse_attr attr;
1303 u16 config_error;
1304
1305 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1306
1307 if (wps_parse_msg(msg, &attr) < 0)
1308 return WPS_FAILURE;
1309
1310 if (attr.msg_type == NULL) {
1311 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1312 return WPS_FAILURE;
1313 }
1314
1315 if (*attr.msg_type != WPS_WSC_NACK) {
1316 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1317 *attr.msg_type);
1318 return WPS_FAILURE;
1319 }
1320
1321 if (attr.registrar_nonce == NULL ||
1322 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0)
1323 {
1324 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1325 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
1326 attr.registrar_nonce, WPS_NONCE_LEN);
1327 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
1328 wps->nonce_r, WPS_NONCE_LEN);
1329 return WPS_FAILURE;
1330 }
1331
1332 if (attr.enrollee_nonce == NULL ||
1333 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) {
1334 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1335 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
1336 attr.enrollee_nonce, WPS_NONCE_LEN);
1337 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
1338 wps->nonce_e, WPS_NONCE_LEN);
1339 return WPS_FAILURE;
1340 }
1341
1342 if (attr.config_error == NULL) {
1343 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1344 "in WSC_NACK");
1345 return WPS_FAILURE;
1346 }
1347
1348 config_error = WPA_GET_BE16(attr.config_error);
1349 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
1350 "Configuration Error %d", config_error);
1351
1352 switch (wps->state) {
1353 case RECV_M4:
1354 wps_fail_event(wps->wps, WPS_M3, config_error,
1355 wps->error_indication, wps->peer_dev.mac_addr);
1356 break;
1357 case RECV_M6:
1358 wps_fail_event(wps->wps, WPS_M5, config_error,
1359 wps->error_indication, wps->peer_dev.mac_addr);
1360 break;
1361 case RECV_M8:
1362 wps_fail_event(wps->wps, WPS_M7, config_error,
1363 wps->error_indication, wps->peer_dev.mac_addr);
1364 break;
1365 default:
1366 break;
1367 }
1368
1369 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
1370 * Enrollee is Authenticator */
1371 wps->state = SEND_WSC_NACK;
1372
1373 return WPS_FAILURE;
1374 }
1375
1376
wps_enrollee_process_msg(struct wps_data * wps,enum wsc_op_code op_code,const struct wpabuf * msg)1377 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps,
1378 enum wsc_op_code op_code,
1379 const struct wpabuf *msg)
1380 {
1381
1382 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1383 "op_code=%d)",
1384 (unsigned long) wpabuf_len(msg), op_code);
1385
1386 if (op_code == WSC_UPnP) {
1387 /* Determine the OpCode based on message type attribute */
1388 struct wps_parse_attr attr;
1389 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) {
1390 if (*attr.msg_type == WPS_WSC_ACK)
1391 op_code = WSC_ACK;
1392 else if (*attr.msg_type == WPS_WSC_NACK)
1393 op_code = WSC_NACK;
1394 }
1395 }
1396
1397 switch (op_code) {
1398 case WSC_MSG:
1399 case WSC_UPnP:
1400 return wps_process_wsc_msg(wps, msg);
1401 case WSC_ACK:
1402 if (wps_validate_wsc_ack(msg) < 0)
1403 return WPS_FAILURE;
1404 return wps_process_wsc_ack(wps, msg);
1405 case WSC_NACK:
1406 if (wps_validate_wsc_nack(msg) < 0)
1407 return WPS_FAILURE;
1408 return wps_process_wsc_nack(wps, msg);
1409 default:
1410 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
1411 return WPS_FAILURE;
1412 }
1413 }
1414