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 config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON |
134 WPS_CONFIG_PHY_PUSHBUTTON);
135 }
136
137 if (wps_build_version(msg) ||
138 wps_build_msg_type(msg, WPS_M1) ||
139 wps_build_uuid_e(msg, wps->uuid_e) ||
140 wps_build_mac_addr(msg, wps->mac_addr_e) ||
141 wps_build_enrollee_nonce(wps, msg) ||
142 wps_build_public_key(wps, msg) ||
143 wps_build_auth_type_flags(wps, msg) ||
144 wps_build_encr_type_flags(wps, msg) ||
145 wps_build_conn_type_flags(wps, msg) ||
146 wps_build_config_methods(msg, config_methods) ||
147 wps_build_wps_state(wps, msg) ||
148 wps_build_device_attrs(&wps->wps->dev, msg) ||
149 wps_build_rf_bands(&wps->wps->dev, msg,
150 wps->wps->rf_band_cb(wps->wps->cb_ctx)) ||
151 wps_build_assoc_state(wps, msg) ||
152 wps_build_dev_password_id(msg, wps->dev_pw_id) ||
153 wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
154 wps_build_os_version(&wps->wps->dev, msg) ||
155 wps_build_wfa_ext(msg, 0, NULL, 0) ||
156 wps_build_vendor_ext_m1(&wps->wps->dev, msg)) {
157 wpabuf_free(msg);
158 return NULL;
159 }
160
161 wps->state = RECV_M2;
162 return msg;
163 }
164
165
wps_build_m3(struct wps_data * wps)166 static struct wpabuf * wps_build_m3(struct wps_data *wps)
167 {
168 struct wpabuf *msg;
169
170 wpa_printf(MSG_DEBUG, "WPS: Building Message M3");
171
172 if (wps->dev_password == NULL) {
173 wpa_printf(MSG_DEBUG, "WPS: No Device Password available");
174 return NULL;
175 }
176 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
177
178 if (wps->wps->ap && random_pool_ready() != 1) {
179 wpa_printf(MSG_INFO,
180 "WPS: Not enough entropy in random pool to proceed - do not allow AP PIN to be used");
181 return NULL;
182 }
183
184 msg = wpabuf_alloc(1000);
185 if (msg == NULL)
186 return NULL;
187
188 if (wps_build_version(msg) ||
189 wps_build_msg_type(msg, WPS_M3) ||
190 wps_build_registrar_nonce(wps, msg) ||
191 wps_build_e_hash(wps, msg) ||
192 wps_build_wfa_ext(msg, 0, NULL, 0) ||
193 wps_build_authenticator(wps, msg)) {
194 wpabuf_free(msg);
195 return NULL;
196 }
197
198 wps->state = RECV_M4;
199 return msg;
200 }
201
202
wps_build_m5(struct wps_data * wps)203 static struct wpabuf * wps_build_m5(struct wps_data *wps)
204 {
205 struct wpabuf *msg, *plain;
206
207 wpa_printf(MSG_DEBUG, "WPS: Building Message M5");
208
209 plain = wpabuf_alloc(200);
210 if (plain == NULL)
211 return NULL;
212
213 msg = wpabuf_alloc(1000);
214 if (msg == NULL) {
215 wpabuf_free(plain);
216 return NULL;
217 }
218
219 if (wps_build_version(msg) ||
220 wps_build_msg_type(msg, WPS_M5) ||
221 wps_build_registrar_nonce(wps, msg) ||
222 wps_build_e_snonce1(wps, plain) ||
223 wps_build_key_wrap_auth(wps, plain) ||
224 wps_build_encr_settings(wps, msg, plain) ||
225 wps_build_wfa_ext(msg, 0, NULL, 0) ||
226 wps_build_authenticator(wps, msg)) {
227 wpabuf_free(plain);
228 wpabuf_free(msg);
229 return NULL;
230 }
231 wpabuf_free(plain);
232
233 wps->state = RECV_M6;
234 return msg;
235 }
236
237
wps_build_cred_ssid(struct wps_data * wps,struct wpabuf * msg)238 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg)
239 {
240 wpa_printf(MSG_DEBUG, "WPS: * SSID");
241 wpabuf_put_be16(msg, ATTR_SSID);
242 wpabuf_put_be16(msg, wps->wps->ssid_len);
243 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len);
244 return 0;
245 }
246
247
wps_build_cred_auth_type(struct wps_data * wps,struct wpabuf * msg)248 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg)
249 {
250 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)",
251 wps->wps->ap_auth_type);
252 wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
253 wpabuf_put_be16(msg, 2);
254 wpabuf_put_be16(msg, wps->wps->ap_auth_type);
255 return 0;
256 }
257
258
wps_build_cred_encr_type(struct wps_data * wps,struct wpabuf * msg)259 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg)
260 {
261 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)",
262 wps->wps->ap_encr_type);
263 wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
264 wpabuf_put_be16(msg, 2);
265 wpabuf_put_be16(msg, wps->wps->ap_encr_type);
266 return 0;
267 }
268
269
wps_build_cred_network_key(struct wps_data * wps,struct wpabuf * msg)270 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg)
271 {
272 if ((wps->wps->ap_auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) &&
273 wps->wps->network_key_len == 0) {
274 char hex[65];
275 u8 psk[32];
276 /* Generate a random per-device PSK */
277 if (random_pool_ready() != 1 ||
278 random_get_bytes(psk, sizeof(psk)) < 0) {
279 wpa_printf(MSG_INFO,
280 "WPS: Could not generate random PSK");
281 return -1;
282 }
283 wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK",
284 psk, sizeof(psk));
285 wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)",
286 (unsigned int) wps->new_psk_len * 2);
287 wpa_snprintf_hex(hex, sizeof(hex), psk, sizeof(psk));
288 wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
289 wpabuf_put_be16(msg, sizeof(psk) * 2);
290 wpabuf_put_data(msg, hex, sizeof(psk) * 2);
291 if (wps->wps->registrar) {
292 wps_cb_new_psk(wps->wps->registrar,
293 wps->peer_dev.mac_addr,
294 wps->p2p_dev_addr, psk, sizeof(psk));
295 }
296 return 0;
297 }
298
299 wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)",
300 (unsigned int) wps->wps->network_key_len);
301 wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
302 wpabuf_put_be16(msg, wps->wps->network_key_len);
303 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len);
304 return 0;
305 }
306
307
wps_build_cred_mac_addr(struct wps_data * wps,struct wpabuf * msg)308 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg)
309 {
310 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)");
311 wpabuf_put_be16(msg, ATTR_MAC_ADDR);
312 wpabuf_put_be16(msg, ETH_ALEN);
313 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN);
314 return 0;
315 }
316
317
wps_build_ap_settings(struct wps_data * wps,struct wpabuf * plain)318 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain)
319 {
320 const u8 *start, *end;
321 int ret;
322
323 if (wps->wps->ap_settings) {
324 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)");
325 wpabuf_put_data(plain, wps->wps->ap_settings,
326 wps->wps->ap_settings_len);
327 return 0;
328 }
329
330 wpa_printf(MSG_DEBUG, "WPS: * AP Settings based on current configuration");
331 start = wpabuf_put(plain, 0);
332 ret = wps_build_cred_ssid(wps, plain) ||
333 wps_build_cred_mac_addr(wps, plain) ||
334 wps_build_cred_auth_type(wps, plain) ||
335 wps_build_cred_encr_type(wps, plain) ||
336 wps_build_cred_network_key(wps, plain);
337 end = wpabuf_put(plain, 0);
338
339 wpa_hexdump_key(MSG_DEBUG, "WPS: Plaintext AP Settings",
340 start, end - start);
341
342 return ret;
343 }
344
345
wps_build_m7(struct wps_data * wps)346 static struct wpabuf * wps_build_m7(struct wps_data *wps)
347 {
348 struct wpabuf *msg, *plain;
349
350 wpa_printf(MSG_DEBUG, "WPS: Building Message M7");
351
352 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len);
353 if (plain == NULL)
354 return NULL;
355
356 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len);
357 if (msg == NULL) {
358 wpabuf_free(plain);
359 return NULL;
360 }
361
362 if (wps_build_version(msg) ||
363 wps_build_msg_type(msg, WPS_M7) ||
364 wps_build_registrar_nonce(wps, msg) ||
365 wps_build_e_snonce2(wps, plain) ||
366 (wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
367 wps_build_key_wrap_auth(wps, plain) ||
368 wps_build_encr_settings(wps, msg, plain) ||
369 wps_build_wfa_ext(msg, 0, NULL, 0) ||
370 wps_build_authenticator(wps, msg)) {
371 wpabuf_free(plain);
372 wpabuf_free(msg);
373 return NULL;
374 }
375 wpabuf_free(plain);
376
377 if (wps->wps->ap && wps->wps->registrar) {
378 /*
379 * If the Registrar is only learning our current configuration,
380 * it may not continue protocol run to successful completion.
381 * Store information here to make sure it remains available.
382 */
383 wps_device_store(wps->wps->registrar, &wps->peer_dev,
384 wps->uuid_r);
385 }
386
387 wps->state = RECV_M8;
388 return msg;
389 }
390
391
wps_build_wsc_done(struct wps_data * wps)392 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps)
393 {
394 struct wpabuf *msg;
395
396 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done");
397
398 msg = wpabuf_alloc(1000);
399 if (msg == NULL)
400 return NULL;
401
402 if (wps_build_version(msg) ||
403 wps_build_msg_type(msg, WPS_WSC_DONE) ||
404 wps_build_enrollee_nonce(wps, msg) ||
405 wps_build_registrar_nonce(wps, msg) ||
406 wps_build_wfa_ext(msg, 0, NULL, 0)) {
407 wpabuf_free(msg);
408 return NULL;
409 }
410
411 if (wps->wps->ap)
412 wps->state = RECV_ACK;
413 else {
414 wps_success_event(wps->wps, wps->peer_dev.mac_addr);
415 wps->state = WPS_FINISHED;
416 }
417 return msg;
418 }
419
420
wps_enrollee_get_msg(struct wps_data * wps,enum wsc_op_code * op_code)421 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps,
422 enum wsc_op_code *op_code)
423 {
424 struct wpabuf *msg;
425
426 switch (wps->state) {
427 case SEND_M1:
428 msg = wps_build_m1(wps);
429 *op_code = WSC_MSG;
430 break;
431 case SEND_M3:
432 msg = wps_build_m3(wps);
433 *op_code = WSC_MSG;
434 break;
435 case SEND_M5:
436 msg = wps_build_m5(wps);
437 *op_code = WSC_MSG;
438 break;
439 case SEND_M7:
440 msg = wps_build_m7(wps);
441 *op_code = WSC_MSG;
442 break;
443 case RECEIVED_M2D:
444 if (wps->wps->ap) {
445 msg = wps_build_wsc_nack(wps);
446 *op_code = WSC_NACK;
447 break;
448 }
449 msg = wps_build_wsc_ack(wps);
450 *op_code = WSC_ACK;
451 if (msg) {
452 /* Another M2/M2D may be received */
453 wps->state = RECV_M2;
454 }
455 break;
456 case SEND_WSC_NACK:
457 msg = wps_build_wsc_nack(wps);
458 *op_code = WSC_NACK;
459 break;
460 case WPS_MSG_DONE:
461 msg = wps_build_wsc_done(wps);
462 *op_code = WSC_Done;
463 break;
464 default:
465 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
466 "a message", wps->state);
467 msg = NULL;
468 break;
469 }
470
471 if (*op_code == WSC_MSG && msg) {
472 /* Save a copy of the last message for Authenticator derivation
473 */
474 wpabuf_free(wps->last_msg);
475 wps->last_msg = wpabuf_dup(msg);
476 }
477
478 return msg;
479 }
480
481
wps_process_registrar_nonce(struct wps_data * wps,const u8 * r_nonce)482 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
483 {
484 if (r_nonce == NULL) {
485 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
486 return -1;
487 }
488
489 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN);
490 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
491 wps->nonce_r, WPS_NONCE_LEN);
492
493 return 0;
494 }
495
496
wps_process_enrollee_nonce(struct wps_data * wps,const u8 * e_nonce)497 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
498 {
499 if (e_nonce == NULL) {
500 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
501 return -1;
502 }
503
504 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) {
505 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received");
506 return -1;
507 }
508
509 return 0;
510 }
511
512
wps_process_uuid_r(struct wps_data * wps,const u8 * uuid_r)513 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r)
514 {
515 if (uuid_r == NULL) {
516 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received");
517 return -1;
518 }
519
520 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN);
521 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
522
523 return 0;
524 }
525
526
wps_process_pubkey(struct wps_data * wps,const u8 * pk,size_t pk_len)527 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
528 size_t pk_len)
529 {
530 if (pk == NULL || pk_len == 0) {
531 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
532 return -1;
533 }
534
535 if (wps->peer_pubkey_hash_set) {
536 u8 hash[WPS_HASH_LEN];
537 sha256_vector(1, &pk, &pk_len, hash);
538 if (os_memcmp_const(hash, wps->peer_pubkey_hash,
539 WPS_OOB_PUBKEY_HASH_LEN) != 0) {
540 wpa_printf(MSG_ERROR, "WPS: Public Key hash mismatch");
541 wpa_hexdump(MSG_DEBUG, "WPS: Received public key",
542 pk, pk_len);
543 wpa_hexdump(MSG_DEBUG, "WPS: Calculated public key "
544 "hash", hash, WPS_OOB_PUBKEY_HASH_LEN);
545 wpa_hexdump(MSG_DEBUG, "WPS: Expected public key hash",
546 wps->peer_pubkey_hash,
547 WPS_OOB_PUBKEY_HASH_LEN);
548 wps->config_error = WPS_CFG_PUBLIC_KEY_HASH_MISMATCH;
549 return -1;
550 }
551 }
552
553 wpabuf_free(wps->dh_pubkey_r);
554 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len);
555 if (wps->dh_pubkey_r == NULL)
556 return -1;
557
558 if (wps_derive_keys(wps) < 0)
559 return -1;
560
561 return 0;
562 }
563
564
wps_process_r_hash1(struct wps_data * wps,const u8 * r_hash1)565 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1)
566 {
567 if (r_hash1 == NULL) {
568 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received");
569 return -1;
570 }
571
572 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN);
573 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN);
574
575 return 0;
576 }
577
578
wps_process_r_hash2(struct wps_data * wps,const u8 * r_hash2)579 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2)
580 {
581 if (r_hash2 == NULL) {
582 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received");
583 return -1;
584 }
585
586 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN);
587 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN);
588
589 return 0;
590 }
591
592
wps_process_r_snonce1(struct wps_data * wps,const u8 * r_snonce1)593 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1)
594 {
595 u8 hash[SHA256_MAC_LEN];
596 const u8 *addr[4];
597 size_t len[4];
598
599 if (r_snonce1 == NULL) {
600 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received");
601 return -1;
602 }
603
604 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1,
605 WPS_SECRET_NONCE_LEN);
606
607 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
608 addr[0] = r_snonce1;
609 len[0] = WPS_SECRET_NONCE_LEN;
610 addr[1] = wps->psk1;
611 len[1] = WPS_PSK_LEN;
612 addr[2] = wpabuf_head(wps->dh_pubkey_e);
613 len[2] = wpabuf_len(wps->dh_pubkey_e);
614 addr[3] = wpabuf_head(wps->dh_pubkey_r);
615 len[3] = wpabuf_len(wps->dh_pubkey_r);
616 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
617
618 if (os_memcmp_const(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
619 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does "
620 "not match with the pre-committed value");
621 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
622 wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr);
623 return -1;
624 }
625
626 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first "
627 "half of the device password");
628
629 return 0;
630 }
631
632
wps_process_r_snonce2(struct wps_data * wps,const u8 * r_snonce2)633 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2)
634 {
635 u8 hash[SHA256_MAC_LEN];
636 const u8 *addr[4];
637 size_t len[4];
638
639 if (r_snonce2 == NULL) {
640 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received");
641 return -1;
642 }
643
644 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2,
645 WPS_SECRET_NONCE_LEN);
646
647 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
648 addr[0] = r_snonce2;
649 len[0] = WPS_SECRET_NONCE_LEN;
650 addr[1] = wps->psk2;
651 len[1] = WPS_PSK_LEN;
652 addr[2] = wpabuf_head(wps->dh_pubkey_e);
653 len[2] = wpabuf_len(wps->dh_pubkey_e);
654 addr[3] = wpabuf_head(wps->dh_pubkey_r);
655 len[3] = wpabuf_len(wps->dh_pubkey_r);
656 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
657
658 if (os_memcmp_const(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
659 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does "
660 "not match with the pre-committed value");
661 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
662 wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr);
663 return -1;
664 }
665
666 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second "
667 "half of the device password");
668
669 return 0;
670 }
671
672
wps_process_cred_e(struct wps_data * wps,const u8 * cred,size_t cred_len,int wps2)673 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred,
674 size_t cred_len, int wps2)
675 {
676 struct wps_parse_attr attr;
677 struct wpabuf msg;
678 int ret = 0;
679
680 wpa_printf(MSG_DEBUG, "WPS: Received Credential");
681 os_memset(&wps->cred, 0, sizeof(wps->cred));
682 wpabuf_set(&msg, cred, cred_len);
683 if (wps_parse_msg(&msg, &attr) < 0 ||
684 wps_process_cred(&attr, &wps->cred))
685 return -1;
686
687 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
688 0) {
689 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential ("
690 MACSTR ") does not match with own address (" MACSTR
691 ")", MAC2STR(wps->cred.mac_addr),
692 MAC2STR(wps->wps->dev.mac_addr));
693 /*
694 * In theory, this could be consider fatal error, but there are
695 * number of deployed implementations using other address here
696 * due to unclarity in the specification. For interoperability
697 * reasons, allow this to be processed since we do not really
698 * use the MAC Address information for anything.
699 */
700 #ifdef CONFIG_WPS_STRICT
701 if (wps2) {
702 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect "
703 "MAC Address in AP Settings");
704 return -1;
705 }
706 #endif /* CONFIG_WPS_STRICT */
707 }
708
709 if (!(wps->cred.encr_type &
710 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) {
711 if (wps->cred.encr_type & WPS_ENCR_WEP) {
712 wpa_printf(MSG_INFO, "WPS: Reject Credential "
713 "due to WEP configuration");
714 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED;
715 return -2;
716 }
717
718 wpa_printf(MSG_INFO, "WPS: Reject Credential due to "
719 "invalid encr_type 0x%x", wps->cred.encr_type);
720 return -1;
721 }
722
723 if (wps->wps->cred_cb) {
724 wps->cred.cred_attr = cred - 4;
725 wps->cred.cred_attr_len = cred_len + 4;
726 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
727 wps->cred.cred_attr = NULL;
728 wps->cred.cred_attr_len = 0;
729 }
730
731 return ret;
732 }
733
734
wps_process_creds(struct wps_data * wps,const u8 * cred[],size_t cred_len[],size_t num_cred,int wps2)735 static int wps_process_creds(struct wps_data *wps, const u8 *cred[],
736 size_t cred_len[], size_t num_cred, int wps2)
737 {
738 size_t i;
739 int ok = 0;
740
741 if (wps->wps->ap)
742 return 0;
743
744 if (num_cred == 0) {
745 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes "
746 "received");
747 return -1;
748 }
749
750 for (i = 0; i < num_cred; i++) {
751 int res;
752 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2);
753 if (res == 0)
754 ok++;
755 else if (res == -2)
756 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped");
757 else
758 return -1;
759 }
760
761 if (ok == 0) {
762 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute "
763 "received");
764 return -1;
765 }
766
767 return 0;
768 }
769
770
wps_process_ap_settings_e(struct wps_data * wps,struct wps_parse_attr * attr,struct wpabuf * attrs,int wps2)771 static int wps_process_ap_settings_e(struct wps_data *wps,
772 struct wps_parse_attr *attr,
773 struct wpabuf *attrs, int wps2)
774 {
775 struct wps_credential cred;
776
777 if (!wps->wps->ap)
778 return 0;
779
780 if (wps_process_ap_settings(attr, &cred) < 0)
781 return -1;
782
783 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from "
784 "Registrar");
785
786 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
787 0) {
788 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings ("
789 MACSTR ") does not match with own address (" MACSTR
790 ")", MAC2STR(cred.mac_addr),
791 MAC2STR(wps->wps->dev.mac_addr));
792 /*
793 * In theory, this could be consider fatal error, but there are
794 * number of deployed implementations using other address here
795 * due to unclarity in the specification. For interoperability
796 * reasons, allow this to be processed since we do not really
797 * use the MAC Address information for anything.
798 */
799 #ifdef CONFIG_WPS_STRICT
800 if (wps2) {
801 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect "
802 "MAC Address in AP Settings");
803 return -1;
804 }
805 #endif /* CONFIG_WPS_STRICT */
806 }
807
808 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES)))
809 {
810 if (cred.encr_type & WPS_ENCR_WEP) {
811 wpa_printf(MSG_INFO, "WPS: Reject new AP settings "
812 "due to WEP configuration");
813 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED;
814 return -1;
815 }
816
817 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to "
818 "invalid encr_type 0x%x", cred.encr_type);
819 return -1;
820 }
821
822 #ifdef CONFIG_WPS_STRICT
823 if (wps2) {
824 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) ==
825 WPS_ENCR_TKIP ||
826 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
827 WPS_AUTH_WPAPSK) {
828 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 "
829 "AP Settings: WPA-Personal/TKIP only");
830 wps->error_indication =
831 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED;
832 return -1;
833 }
834 }
835 #endif /* CONFIG_WPS_STRICT */
836
837 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP)
838 {
839 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> "
840 "TKIP+AES");
841 cred.encr_type |= WPS_ENCR_AES;
842 }
843
844 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
845 WPS_AUTH_WPAPSK) {
846 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> "
847 "WPAPSK+WPA2PSK");
848 cred.auth_type |= WPS_AUTH_WPA2PSK;
849 }
850
851 if (wps->wps->cred_cb) {
852 cred.cred_attr = wpabuf_head(attrs);
853 cred.cred_attr_len = wpabuf_len(attrs);
854 wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
855 }
856
857 return 0;
858 }
859
860
wps_process_dev_pw_id(struct wps_data * wps,const u8 * dev_pw_id)861 static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id)
862 {
863 u16 id;
864
865 if (dev_pw_id == NULL) {
866 wpa_printf(MSG_DEBUG, "WPS: Device Password ID");
867 return -1;
868 }
869
870 id = WPA_GET_BE16(dev_pw_id);
871 if (wps->dev_pw_id == id) {
872 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id);
873 return 0;
874 }
875
876 #ifdef CONFIG_P2P
877 if ((id == DEV_PW_DEFAULT &&
878 wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) ||
879 (id == DEV_PW_REGISTRAR_SPECIFIED &&
880 wps->dev_pw_id == DEV_PW_DEFAULT)) {
881 /*
882 * Common P2P use cases indicate whether the PIN is from the
883 * client or GO using Device Password Id in M1/M2 in a way that
884 * does not look fully compliant with WSC specification. Anyway,
885 * this is deployed and needs to be allowed, so ignore changes
886 * between Registrar-Specified and Default PIN.
887 */
888 wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID "
889 "change");
890 return 0;
891 }
892 #endif /* CONFIG_P2P */
893
894 wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password "
895 "ID from %u to %u", wps->dev_pw_id, id);
896
897 if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) {
898 wpa_printf(MSG_DEBUG,
899 "WPS: Workaround - ignore PBC-to-PIN change");
900 return 0;
901 }
902
903 if (wps->alt_dev_password && wps->alt_dev_pw_id == id) {
904 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password");
905 bin_clear_free(wps->dev_password, wps->dev_password_len);
906 wps->dev_pw_id = wps->alt_dev_pw_id;
907 wps->dev_password = wps->alt_dev_password;
908 wps->dev_password_len = wps->alt_dev_password_len;
909 wps->alt_dev_password = NULL;
910 wps->alt_dev_password_len = 0;
911 return 0;
912 }
913
914 return -1;
915 }
916
917
wps_process_m2(struct wps_data * wps,const struct wpabuf * msg,struct wps_parse_attr * attr)918 static enum wps_process_res wps_process_m2(struct wps_data *wps,
919 const struct wpabuf *msg,
920 struct wps_parse_attr *attr)
921 {
922 wpa_printf(MSG_DEBUG, "WPS: Received M2");
923
924 if (wps->state != RECV_M2) {
925 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
926 "receiving M2", wps->state);
927 wps->state = SEND_WSC_NACK;
928 return WPS_CONTINUE;
929 }
930
931 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
932 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
933 wps_process_uuid_r(wps, attr->uuid_r) ||
934 wps_process_dev_pw_id(wps, attr->dev_password_id)) {
935 wps->state = SEND_WSC_NACK;
936 return WPS_CONTINUE;
937 }
938
939 /*
940 * Stop here on an AP as an Enrollee if AP Setup is locked unless the
941 * special locked mode is used to allow protocol run up to M7 in order
942 * to support external Registrars that only learn the current AP
943 * configuration without changing it.
944 */
945 if (wps->wps->ap &&
946 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) ||
947 wps->dev_password == NULL)) {
948 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
949 "registration of a new Registrar");
950 wps->config_error = WPS_CFG_SETUP_LOCKED;
951 wps->state = SEND_WSC_NACK;
952 return WPS_CONTINUE;
953 }
954
955 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
956 wps_process_authenticator(wps, attr->authenticator, msg) ||
957 wps_process_device_attrs(&wps->peer_dev, attr)) {
958 wps->state = SEND_WSC_NACK;
959 return WPS_CONTINUE;
960 }
961
962 #ifdef CONFIG_WPS_NFC
963 if (wps->peer_pubkey_hash_set) {
964 struct wpabuf *decrypted;
965 struct wps_parse_attr eattr;
966
967 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
968 attr->encr_settings_len);
969 if (decrypted == NULL) {
970 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypt "
971 "Encrypted Settings attribute");
972 wps->state = SEND_WSC_NACK;
973 return WPS_CONTINUE;
974 }
975
976 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted "
977 "Settings attribute");
978 if (wps_parse_msg(decrypted, &eattr) < 0 ||
979 wps_process_key_wrap_auth(wps, decrypted,
980 eattr.key_wrap_auth) ||
981 wps_process_creds(wps, eattr.cred, eattr.cred_len,
982 eattr.num_cred, attr->version2 != NULL)) {
983 wpabuf_free(decrypted);
984 wps->state = SEND_WSC_NACK;
985 return WPS_CONTINUE;
986 }
987 wpabuf_free(decrypted);
988
989 wps->state = WPS_MSG_DONE;
990 return WPS_CONTINUE;
991 }
992 #endif /* CONFIG_WPS_NFC */
993
994 wps->state = SEND_M3;
995 return WPS_CONTINUE;
996 }
997
998
wps_process_m2d(struct wps_data * wps,struct wps_parse_attr * attr)999 static enum wps_process_res wps_process_m2d(struct wps_data *wps,
1000 struct wps_parse_attr *attr)
1001 {
1002 wpa_printf(MSG_DEBUG, "WPS: Received M2D");
1003
1004 if (wps->state != RECV_M2) {
1005 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1006 "receiving M2D", wps->state);
1007 wps->state = SEND_WSC_NACK;
1008 return WPS_CONTINUE;
1009 }
1010
1011 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
1012 attr->manufacturer, attr->manufacturer_len);
1013 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
1014 attr->model_name, attr->model_name_len);
1015 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
1016 attr->model_number, attr->model_number_len);
1017 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
1018 attr->serial_number, attr->serial_number_len);
1019 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
1020 attr->dev_name, attr->dev_name_len);
1021
1022 if (wps->wps->event_cb) {
1023 union wps_event_data data;
1024 struct wps_event_m2d *m2d = &data.m2d;
1025 os_memset(&data, 0, sizeof(data));
1026 if (attr->config_methods)
1027 m2d->config_methods =
1028 WPA_GET_BE16(attr->config_methods);
1029 m2d->manufacturer = attr->manufacturer;
1030 m2d->manufacturer_len = attr->manufacturer_len;
1031 m2d->model_name = attr->model_name;
1032 m2d->model_name_len = attr->model_name_len;
1033 m2d->model_number = attr->model_number;
1034 m2d->model_number_len = attr->model_number_len;
1035 m2d->serial_number = attr->serial_number;
1036 m2d->serial_number_len = attr->serial_number_len;
1037 m2d->dev_name = attr->dev_name;
1038 m2d->dev_name_len = attr->dev_name_len;
1039 m2d->primary_dev_type = attr->primary_dev_type;
1040 if (attr->config_error)
1041 m2d->config_error =
1042 WPA_GET_BE16(attr->config_error);
1043 if (attr->dev_password_id)
1044 m2d->dev_password_id =
1045 WPA_GET_BE16(attr->dev_password_id);
1046 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
1047 }
1048
1049 wps->state = RECEIVED_M2D;
1050 return WPS_CONTINUE;
1051 }
1052
1053
wps_process_m4(struct wps_data * wps,const struct wpabuf * msg,struct wps_parse_attr * attr)1054 static enum wps_process_res wps_process_m4(struct wps_data *wps,
1055 const struct wpabuf *msg,
1056 struct wps_parse_attr *attr)
1057 {
1058 struct wpabuf *decrypted;
1059 struct wps_parse_attr eattr;
1060
1061 wpa_printf(MSG_DEBUG, "WPS: Received M4");
1062
1063 if (wps->state != RECV_M4) {
1064 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1065 "receiving M4", wps->state);
1066 wps->state = SEND_WSC_NACK;
1067 return WPS_CONTINUE;
1068 }
1069
1070 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1071 wps_process_authenticator(wps, attr->authenticator, msg) ||
1072 wps_process_r_hash1(wps, attr->r_hash1) ||
1073 wps_process_r_hash2(wps, attr->r_hash2)) {
1074 wps->state = SEND_WSC_NACK;
1075 return WPS_CONTINUE;
1076 }
1077
1078 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1079 attr->encr_settings_len);
1080 if (decrypted == NULL) {
1081 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1082 "Settings attribute");
1083 wps->state = SEND_WSC_NACK;
1084 return WPS_CONTINUE;
1085 }
1086
1087 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) {
1088 wpabuf_free(decrypted);
1089 wps->state = SEND_WSC_NACK;
1090 return WPS_CONTINUE;
1091 }
1092
1093 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1094 "attribute");
1095 if (wps_parse_msg(decrypted, &eattr) < 0 ||
1096 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1097 wps_process_r_snonce1(wps, eattr.r_snonce1)) {
1098 wpabuf_free(decrypted);
1099 wps->state = SEND_WSC_NACK;
1100 return WPS_CONTINUE;
1101 }
1102 wpabuf_free(decrypted);
1103
1104 wps->state = SEND_M5;
1105 return WPS_CONTINUE;
1106 }
1107
1108
wps_process_m6(struct wps_data * wps,const struct wpabuf * msg,struct wps_parse_attr * attr)1109 static enum wps_process_res wps_process_m6(struct wps_data *wps,
1110 const struct wpabuf *msg,
1111 struct wps_parse_attr *attr)
1112 {
1113 struct wpabuf *decrypted;
1114 struct wps_parse_attr eattr;
1115
1116 wpa_printf(MSG_DEBUG, "WPS: Received M6");
1117
1118 if (wps->state != RECV_M6) {
1119 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1120 "receiving M6", wps->state);
1121 wps->state = SEND_WSC_NACK;
1122 return WPS_CONTINUE;
1123 }
1124
1125 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1126 wps_process_authenticator(wps, attr->authenticator, msg)) {
1127 wps->state = SEND_WSC_NACK;
1128 return WPS_CONTINUE;
1129 }
1130
1131 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1132 attr->encr_settings_len);
1133 if (decrypted == NULL) {
1134 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1135 "Settings attribute");
1136 wps->state = SEND_WSC_NACK;
1137 return WPS_CONTINUE;
1138 }
1139
1140 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) {
1141 wpabuf_free(decrypted);
1142 wps->state = SEND_WSC_NACK;
1143 return WPS_CONTINUE;
1144 }
1145
1146 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1147 "attribute");
1148 if (wps_parse_msg(decrypted, &eattr) < 0 ||
1149 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1150 wps_process_r_snonce2(wps, eattr.r_snonce2)) {
1151 wpabuf_free(decrypted);
1152 wps->state = SEND_WSC_NACK;
1153 return WPS_CONTINUE;
1154 }
1155 wpabuf_free(decrypted);
1156
1157 if (wps->wps->ap)
1158 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS,
1159 NULL);
1160
1161 wps->state = SEND_M7;
1162 return WPS_CONTINUE;
1163 }
1164
1165
wps_process_m8(struct wps_data * wps,const struct wpabuf * msg,struct wps_parse_attr * attr)1166 static enum wps_process_res wps_process_m8(struct wps_data *wps,
1167 const struct wpabuf *msg,
1168 struct wps_parse_attr *attr)
1169 {
1170 struct wpabuf *decrypted;
1171 struct wps_parse_attr eattr;
1172
1173 wpa_printf(MSG_DEBUG, "WPS: Received M8");
1174
1175 if (wps->state != RECV_M8) {
1176 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1177 "receiving M8", wps->state);
1178 wps->state = SEND_WSC_NACK;
1179 return WPS_CONTINUE;
1180 }
1181
1182 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1183 wps_process_authenticator(wps, attr->authenticator, msg)) {
1184 wps->state = SEND_WSC_NACK;
1185 return WPS_CONTINUE;
1186 }
1187
1188 if (wps->wps->ap && wps->wps->ap_setup_locked) {
1189 /*
1190 * Stop here if special ap_setup_locked == 2 mode allowed the
1191 * protocol to continue beyond M2. This allows ER to learn the
1192 * current AP settings without changing them.
1193 */
1194 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
1195 "registration of a new Registrar");
1196 wps->config_error = WPS_CFG_SETUP_LOCKED;
1197 wps->state = SEND_WSC_NACK;
1198 return WPS_CONTINUE;
1199 }
1200
1201 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1202 attr->encr_settings_len);
1203 if (decrypted == NULL) {
1204 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1205 "Settings attribute");
1206 wps->state = SEND_WSC_NACK;
1207 return WPS_CONTINUE;
1208 }
1209
1210 if (wps_validate_m8_encr(decrypted, wps->wps->ap,
1211 attr->version2 != NULL) < 0) {
1212 wpabuf_free(decrypted);
1213 wps->state = SEND_WSC_NACK;
1214 return WPS_CONTINUE;
1215 }
1216
1217 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1218 "attribute");
1219 if (wps_parse_msg(decrypted, &eattr) < 0 ||
1220 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1221 wps_process_creds(wps, eattr.cred, eattr.cred_len,
1222 eattr.num_cred, attr->version2 != NULL) ||
1223 wps_process_ap_settings_e(wps, &eattr, decrypted,
1224 attr->version2 != NULL)) {
1225 wpabuf_free(decrypted);
1226 wps->state = SEND_WSC_NACK;
1227 return WPS_CONTINUE;
1228 }
1229 wpabuf_free(decrypted);
1230
1231 wps->state = WPS_MSG_DONE;
1232 return WPS_CONTINUE;
1233 }
1234
1235
wps_process_wsc_msg(struct wps_data * wps,const struct wpabuf * msg)1236 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
1237 const struct wpabuf *msg)
1238 {
1239 struct wps_parse_attr attr;
1240 enum wps_process_res ret = WPS_CONTINUE;
1241
1242 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
1243
1244 if (wps_parse_msg(msg, &attr) < 0)
1245 return WPS_FAILURE;
1246
1247 if (attr.enrollee_nonce == NULL ||
1248 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) {
1249 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1250 return WPS_FAILURE;
1251 }
1252
1253 if (attr.msg_type == NULL) {
1254 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1255 wps->state = SEND_WSC_NACK;
1256 return WPS_CONTINUE;
1257 }
1258
1259 switch (*attr.msg_type) {
1260 case WPS_M2:
1261 if (wps_validate_m2(msg) < 0)
1262 return WPS_FAILURE;
1263 ret = wps_process_m2(wps, msg, &attr);
1264 break;
1265 case WPS_M2D:
1266 if (wps_validate_m2d(msg) < 0)
1267 return WPS_FAILURE;
1268 ret = wps_process_m2d(wps, &attr);
1269 break;
1270 case WPS_M4:
1271 if (wps_validate_m4(msg) < 0)
1272 return WPS_FAILURE;
1273 ret = wps_process_m4(wps, msg, &attr);
1274 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1275 wps_fail_event(wps->wps, WPS_M4, wps->config_error,
1276 wps->error_indication,
1277 wps->peer_dev.mac_addr);
1278 break;
1279 case WPS_M6:
1280 if (wps_validate_m6(msg) < 0)
1281 return WPS_FAILURE;
1282 ret = wps_process_m6(wps, msg, &attr);
1283 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1284 wps_fail_event(wps->wps, WPS_M6, wps->config_error,
1285 wps->error_indication,
1286 wps->peer_dev.mac_addr);
1287 break;
1288 case WPS_M8:
1289 if (wps_validate_m8(msg) < 0)
1290 return WPS_FAILURE;
1291 ret = wps_process_m8(wps, msg, &attr);
1292 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1293 wps_fail_event(wps->wps, WPS_M8, wps->config_error,
1294 wps->error_indication,
1295 wps->peer_dev.mac_addr);
1296 break;
1297 default:
1298 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1299 *attr.msg_type);
1300 return WPS_FAILURE;
1301 }
1302
1303 /*
1304 * Save a copy of the last message for Authenticator derivation if we
1305 * are continuing. However, skip M2D since it is not authenticated and
1306 * neither is the ACK/NACK response frame. This allows the possibly
1307 * following M2 to be processed correctly by using the previously sent
1308 * M1 in Authenticator derivation.
1309 */
1310 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) {
1311 /* Save a copy of the last message for Authenticator derivation
1312 */
1313 wpabuf_free(wps->last_msg);
1314 wps->last_msg = wpabuf_dup(msg);
1315 }
1316
1317 return ret;
1318 }
1319
1320
wps_process_wsc_ack(struct wps_data * wps,const struct wpabuf * msg)1321 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
1322 const struct wpabuf *msg)
1323 {
1324 struct wps_parse_attr attr;
1325
1326 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1327
1328 if (wps_parse_msg(msg, &attr) < 0)
1329 return WPS_FAILURE;
1330
1331 if (attr.msg_type == NULL) {
1332 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1333 return WPS_FAILURE;
1334 }
1335
1336 if (*attr.msg_type != WPS_WSC_ACK) {
1337 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1338 *attr.msg_type);
1339 return WPS_FAILURE;
1340 }
1341
1342 if (attr.registrar_nonce == NULL ||
1343 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0)
1344 {
1345 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1346 return WPS_FAILURE;
1347 }
1348
1349 if (attr.enrollee_nonce == NULL ||
1350 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) {
1351 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1352 return WPS_FAILURE;
1353 }
1354
1355 if (wps->state == RECV_ACK && wps->wps->ap) {
1356 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
1357 "completed successfully");
1358 wps_success_event(wps->wps, wps->peer_dev.mac_addr);
1359 wps->state = WPS_FINISHED;
1360 return WPS_DONE;
1361 }
1362
1363 return WPS_FAILURE;
1364 }
1365
1366
wps_process_wsc_nack(struct wps_data * wps,const struct wpabuf * msg)1367 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1368 const struct wpabuf *msg)
1369 {
1370 struct wps_parse_attr attr;
1371 u16 config_error;
1372
1373 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1374
1375 if (wps_parse_msg(msg, &attr) < 0)
1376 return WPS_FAILURE;
1377
1378 if (attr.msg_type == NULL) {
1379 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1380 return WPS_FAILURE;
1381 }
1382
1383 if (*attr.msg_type != WPS_WSC_NACK) {
1384 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1385 *attr.msg_type);
1386 return WPS_FAILURE;
1387 }
1388
1389 if (attr.registrar_nonce == NULL ||
1390 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0)
1391 {
1392 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1393 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
1394 attr.registrar_nonce, WPS_NONCE_LEN);
1395 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
1396 wps->nonce_r, WPS_NONCE_LEN);
1397 return WPS_FAILURE;
1398 }
1399
1400 if (attr.enrollee_nonce == NULL ||
1401 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) {
1402 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1403 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
1404 attr.enrollee_nonce, WPS_NONCE_LEN);
1405 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
1406 wps->nonce_e, WPS_NONCE_LEN);
1407 return WPS_FAILURE;
1408 }
1409
1410 if (attr.config_error == NULL) {
1411 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1412 "in WSC_NACK");
1413 return WPS_FAILURE;
1414 }
1415
1416 config_error = WPA_GET_BE16(attr.config_error);
1417 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
1418 "Configuration Error %d", config_error);
1419
1420 switch (wps->state) {
1421 case RECV_M4:
1422 wps_fail_event(wps->wps, WPS_M3, config_error,
1423 wps->error_indication, wps->peer_dev.mac_addr);
1424 break;
1425 case RECV_M6:
1426 wps_fail_event(wps->wps, WPS_M5, config_error,
1427 wps->error_indication, wps->peer_dev.mac_addr);
1428 break;
1429 case RECV_M8:
1430 wps_fail_event(wps->wps, WPS_M7, config_error,
1431 wps->error_indication, wps->peer_dev.mac_addr);
1432 break;
1433 default:
1434 break;
1435 }
1436
1437 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
1438 * Enrollee is Authenticator */
1439 wps->state = SEND_WSC_NACK;
1440
1441 return WPS_FAILURE;
1442 }
1443
1444
wps_enrollee_process_msg(struct wps_data * wps,enum wsc_op_code op_code,const struct wpabuf * msg)1445 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps,
1446 enum wsc_op_code op_code,
1447 const struct wpabuf *msg)
1448 {
1449
1450 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1451 "op_code=%d)",
1452 (unsigned long) wpabuf_len(msg), op_code);
1453
1454 if (op_code == WSC_UPnP) {
1455 /* Determine the OpCode based on message type attribute */
1456 struct wps_parse_attr attr;
1457 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) {
1458 if (*attr.msg_type == WPS_WSC_ACK)
1459 op_code = WSC_ACK;
1460 else if (*attr.msg_type == WPS_WSC_NACK)
1461 op_code = WSC_NACK;
1462 }
1463 }
1464
1465 switch (op_code) {
1466 case WSC_MSG:
1467 case WSC_UPnP:
1468 return wps_process_wsc_msg(wps, msg);
1469 case WSC_ACK:
1470 if (wps_validate_wsc_ack(msg) < 0)
1471 return WPS_FAILURE;
1472 return wps_process_wsc_ack(wps, msg);
1473 case WSC_NACK:
1474 if (wps_validate_wsc_nack(msg) < 0)
1475 return WPS_FAILURE;
1476 return wps_process_wsc_nack(wps, msg);
1477 default:
1478 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
1479 return WPS_FAILURE;
1480 }
1481 }
1482