Line data Source code
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 :
19 45 : static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg)
20 : {
21 : u8 state;
22 45 : if (wps->wps->ap)
23 45 : state = wps->wps->wps_state;
24 : else
25 0 : state = WPS_STATE_NOT_CONFIGURED;
26 45 : wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)",
27 : state);
28 45 : wpabuf_put_be16(msg, ATTR_WPS_STATE);
29 45 : wpabuf_put_be16(msg, 1);
30 45 : wpabuf_put_u8(msg, state);
31 45 : return 0;
32 : }
33 :
34 :
35 29 : 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 29 : if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0)
42 0 : return -1;
43 29 : wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN);
44 29 : wpa_hexdump(MSG_DEBUG, "WPS: E-S2",
45 29 : wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN);
46 :
47 29 : if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) {
48 0 : wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for "
49 : "E-Hash derivation");
50 0 : return -1;
51 : }
52 :
53 29 : wpa_printf(MSG_DEBUG, "WPS: * E-Hash1");
54 29 : wpabuf_put_be16(msg, ATTR_E_HASH1);
55 29 : wpabuf_put_be16(msg, SHA256_MAC_LEN);
56 29 : hash = wpabuf_put(msg, SHA256_MAC_LEN);
57 : /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */
58 29 : addr[0] = wps->snonce;
59 29 : len[0] = WPS_SECRET_NONCE_LEN;
60 29 : addr[1] = wps->psk1;
61 29 : len[1] = WPS_PSK_LEN;
62 29 : addr[2] = wpabuf_head(wps->dh_pubkey_e);
63 29 : len[2] = wpabuf_len(wps->dh_pubkey_e);
64 29 : addr[3] = wpabuf_head(wps->dh_pubkey_r);
65 29 : len[3] = wpabuf_len(wps->dh_pubkey_r);
66 29 : hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
67 29 : wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN);
68 :
69 29 : wpa_printf(MSG_DEBUG, "WPS: * E-Hash2");
70 29 : wpabuf_put_be16(msg, ATTR_E_HASH2);
71 29 : wpabuf_put_be16(msg, SHA256_MAC_LEN);
72 29 : hash = wpabuf_put(msg, SHA256_MAC_LEN);
73 : /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */
74 29 : addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN;
75 29 : addr[1] = wps->psk2;
76 29 : hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
77 29 : wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN);
78 :
79 29 : return 0;
80 : }
81 :
82 :
83 25 : static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg)
84 : {
85 25 : wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1");
86 25 : wpabuf_put_be16(msg, ATTR_E_SNONCE1);
87 25 : wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
88 25 : wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN);
89 25 : return 0;
90 : }
91 :
92 :
93 23 : static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg)
94 : {
95 23 : wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2");
96 23 : wpabuf_put_be16(msg, ATTR_E_SNONCE2);
97 23 : wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
98 23 : wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN,
99 : WPS_SECRET_NONCE_LEN);
100 23 : return 0;
101 : }
102 :
103 :
104 45 : static struct wpabuf * wps_build_m1(struct wps_data *wps)
105 : {
106 : struct wpabuf *msg;
107 : u16 config_methods;
108 :
109 45 : if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0)
110 0 : return NULL;
111 45 : wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
112 45 : wps->nonce_e, WPS_NONCE_LEN);
113 :
114 45 : wpa_printf(MSG_DEBUG, "WPS: Building Message M1");
115 45 : msg = wpabuf_alloc(1000);
116 45 : if (msg == NULL)
117 0 : return NULL;
118 :
119 45 : config_methods = wps->wps->config_methods;
120 90 : if (wps->wps->ap && !wps->pbc_in_m1 &&
121 48 : (wps->dev_password_len != 0 ||
122 3 : (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 42 : config_methods &= ~WPS_CONFIG_PUSHBUTTON;
133 42 : config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON |
134 : WPS_CONFIG_PHY_PUSHBUTTON);
135 : }
136 :
137 90 : if (wps_build_version(msg) ||
138 90 : wps_build_msg_type(msg, WPS_M1) ||
139 90 : wps_build_uuid_e(msg, wps->uuid_e) ||
140 90 : wps_build_mac_addr(msg, wps->mac_addr_e) ||
141 90 : wps_build_enrollee_nonce(wps, msg) ||
142 90 : wps_build_public_key(wps, msg) ||
143 90 : wps_build_auth_type_flags(wps, msg) ||
144 90 : wps_build_encr_type_flags(wps, msg) ||
145 90 : wps_build_conn_type_flags(wps, msg) ||
146 90 : wps_build_config_methods(msg, config_methods) ||
147 90 : wps_build_wps_state(wps, msg) ||
148 90 : wps_build_device_attrs(&wps->wps->dev, msg) ||
149 45 : wps_build_rf_bands(&wps->wps->dev, msg,
150 90 : wps->wps->rf_band_cb(wps->wps->cb_ctx)) ||
151 90 : wps_build_assoc_state(wps, msg) ||
152 90 : wps_build_dev_password_id(msg, wps->dev_pw_id) ||
153 90 : wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
154 90 : wps_build_os_version(&wps->wps->dev, msg) ||
155 90 : wps_build_wfa_ext(msg, 0, NULL, 0) ||
156 45 : wps_build_vendor_ext_m1(&wps->wps->dev, msg)) {
157 0 : wpabuf_free(msg);
158 0 : return NULL;
159 : }
160 :
161 45 : wps->state = RECV_M2;
162 45 : return msg;
163 : }
164 :
165 :
166 29 : static struct wpabuf * wps_build_m3(struct wps_data *wps)
167 : {
168 : struct wpabuf *msg;
169 :
170 29 : wpa_printf(MSG_DEBUG, "WPS: Building Message M3");
171 :
172 29 : if (wps->dev_password == NULL) {
173 0 : wpa_printf(MSG_DEBUG, "WPS: No Device Password available");
174 0 : return NULL;
175 : }
176 29 : 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 29 : msg = wpabuf_alloc(1000);
185 29 : if (msg == NULL)
186 0 : return NULL;
187 :
188 58 : if (wps_build_version(msg) ||
189 58 : wps_build_msg_type(msg, WPS_M3) ||
190 58 : wps_build_registrar_nonce(wps, msg) ||
191 58 : wps_build_e_hash(wps, msg) ||
192 58 : wps_build_wfa_ext(msg, 0, NULL, 0) ||
193 29 : wps_build_authenticator(wps, msg)) {
194 0 : wpabuf_free(msg);
195 0 : return NULL;
196 : }
197 :
198 29 : wps->state = RECV_M4;
199 29 : return msg;
200 : }
201 :
202 :
203 25 : static struct wpabuf * wps_build_m5(struct wps_data *wps)
204 : {
205 : struct wpabuf *msg, *plain;
206 :
207 25 : wpa_printf(MSG_DEBUG, "WPS: Building Message M5");
208 :
209 25 : plain = wpabuf_alloc(200);
210 25 : if (plain == NULL)
211 0 : return NULL;
212 :
213 25 : msg = wpabuf_alloc(1000);
214 25 : if (msg == NULL) {
215 0 : wpabuf_free(plain);
216 0 : return NULL;
217 : }
218 :
219 50 : if (wps_build_version(msg) ||
220 50 : wps_build_msg_type(msg, WPS_M5) ||
221 50 : wps_build_registrar_nonce(wps, msg) ||
222 50 : wps_build_e_snonce1(wps, plain) ||
223 50 : wps_build_key_wrap_auth(wps, plain) ||
224 50 : wps_build_encr_settings(wps, msg, plain) ||
225 50 : wps_build_wfa_ext(msg, 0, NULL, 0) ||
226 25 : wps_build_authenticator(wps, msg)) {
227 0 : wpabuf_free(plain);
228 0 : wpabuf_free(msg);
229 0 : return NULL;
230 : }
231 25 : wpabuf_free(plain);
232 :
233 25 : wps->state = RECV_M6;
234 25 : return msg;
235 : }
236 :
237 :
238 23 : static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg)
239 : {
240 23 : wpa_printf(MSG_DEBUG, "WPS: * SSID");
241 23 : wpabuf_put_be16(msg, ATTR_SSID);
242 23 : wpabuf_put_be16(msg, wps->wps->ssid_len);
243 23 : wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len);
244 23 : return 0;
245 : }
246 :
247 :
248 23 : static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg)
249 : {
250 23 : wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)",
251 23 : wps->wps->ap_auth_type);
252 23 : wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
253 23 : wpabuf_put_be16(msg, 2);
254 23 : wpabuf_put_be16(msg, wps->wps->ap_auth_type);
255 23 : return 0;
256 : }
257 :
258 :
259 23 : static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg)
260 : {
261 23 : wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)",
262 23 : wps->wps->ap_encr_type);
263 23 : wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
264 23 : wpabuf_put_be16(msg, 2);
265 23 : wpabuf_put_be16(msg, wps->wps->ap_encr_type);
266 23 : return 0;
267 : }
268 :
269 :
270 23 : static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg)
271 : {
272 40 : if ((wps->wps->ap_auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) &&
273 17 : wps->wps->network_key_len == 0) {
274 : char hex[65];
275 : u8 psk[32];
276 : /* Generate a random per-device PSK */
277 3 : if (random_pool_ready() != 1 ||
278 3 : random_get_bytes(psk, sizeof(psk)) < 0) {
279 0 : wpa_printf(MSG_INFO,
280 : "WPS: Could not generate random PSK");
281 0 : return -1;
282 : }
283 3 : wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK",
284 : psk, sizeof(psk));
285 3 : wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)",
286 3 : (unsigned int) wps->new_psk_len * 2);
287 3 : wpa_snprintf_hex(hex, sizeof(hex), psk, sizeof(psk));
288 3 : wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
289 3 : wpabuf_put_be16(msg, sizeof(psk) * 2);
290 3 : wpabuf_put_data(msg, hex, sizeof(psk) * 2);
291 3 : if (wps->wps->registrar) {
292 3 : wps_cb_new_psk(wps->wps->registrar,
293 3 : wps->peer_dev.mac_addr,
294 3 : wps->p2p_dev_addr, psk, sizeof(psk));
295 : }
296 3 : return 0;
297 : }
298 :
299 20 : wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)",
300 20 : (unsigned int) wps->wps->network_key_len);
301 20 : wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
302 20 : wpabuf_put_be16(msg, wps->wps->network_key_len);
303 20 : wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len);
304 20 : return 0;
305 : }
306 :
307 :
308 23 : static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg)
309 : {
310 23 : wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)");
311 23 : wpabuf_put_be16(msg, ATTR_MAC_ADDR);
312 23 : wpabuf_put_be16(msg, ETH_ALEN);
313 23 : wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN);
314 23 : return 0;
315 : }
316 :
317 :
318 23 : static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain)
319 : {
320 : const u8 *start, *end;
321 : int ret;
322 :
323 23 : if (wps->wps->ap_settings) {
324 0 : wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)");
325 0 : wpabuf_put_data(plain, wps->wps->ap_settings,
326 0 : wps->wps->ap_settings_len);
327 0 : return 0;
328 : }
329 :
330 23 : wpa_printf(MSG_DEBUG, "WPS: * AP Settings based on current configuration");
331 23 : start = wpabuf_put(plain, 0);
332 69 : ret = wps_build_cred_ssid(wps, plain) ||
333 46 : wps_build_cred_mac_addr(wps, plain) ||
334 46 : wps_build_cred_auth_type(wps, plain) ||
335 69 : wps_build_cred_encr_type(wps, plain) ||
336 23 : wps_build_cred_network_key(wps, plain);
337 23 : end = wpabuf_put(plain, 0);
338 :
339 23 : wpa_hexdump_key(MSG_DEBUG, "WPS: Plaintext AP Settings",
340 23 : start, end - start);
341 :
342 23 : return ret;
343 : }
344 :
345 :
346 23 : static struct wpabuf * wps_build_m7(struct wps_data *wps)
347 : {
348 : struct wpabuf *msg, *plain;
349 :
350 23 : wpa_printf(MSG_DEBUG, "WPS: Building Message M7");
351 :
352 23 : plain = wpabuf_alloc(500 + wps->wps->ap_settings_len);
353 23 : if (plain == NULL)
354 0 : return NULL;
355 :
356 23 : msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len);
357 23 : if (msg == NULL) {
358 0 : wpabuf_free(plain);
359 0 : return NULL;
360 : }
361 :
362 46 : if (wps_build_version(msg) ||
363 46 : wps_build_msg_type(msg, WPS_M7) ||
364 46 : wps_build_registrar_nonce(wps, msg) ||
365 46 : wps_build_e_snonce2(wps, plain) ||
366 69 : (wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
367 46 : wps_build_key_wrap_auth(wps, plain) ||
368 46 : wps_build_encr_settings(wps, msg, plain) ||
369 46 : wps_build_wfa_ext(msg, 0, NULL, 0) ||
370 23 : wps_build_authenticator(wps, msg)) {
371 0 : wpabuf_free(plain);
372 0 : wpabuf_free(msg);
373 0 : return NULL;
374 : }
375 23 : wpabuf_free(plain);
376 :
377 23 : 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 23 : wps_device_store(wps->wps->registrar, &wps->peer_dev,
384 23 : wps->uuid_r);
385 : }
386 :
387 23 : wps->state = RECV_M8;
388 23 : return msg;
389 : }
390 :
391 :
392 7 : static struct wpabuf * wps_build_wsc_done(struct wps_data *wps)
393 : {
394 : struct wpabuf *msg;
395 :
396 7 : wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done");
397 :
398 7 : msg = wpabuf_alloc(1000);
399 7 : if (msg == NULL)
400 0 : return NULL;
401 :
402 14 : if (wps_build_version(msg) ||
403 14 : wps_build_msg_type(msg, WPS_WSC_DONE) ||
404 14 : wps_build_enrollee_nonce(wps, msg) ||
405 14 : wps_build_registrar_nonce(wps, msg) ||
406 7 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
407 0 : wpabuf_free(msg);
408 0 : return NULL;
409 : }
410 :
411 7 : if (wps->wps->ap)
412 7 : wps->state = RECV_ACK;
413 : else {
414 0 : wps_success_event(wps->wps, wps->peer_dev.mac_addr);
415 0 : wps->state = WPS_FINISHED;
416 : }
417 7 : return msg;
418 : }
419 :
420 :
421 142 : struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps,
422 : enum wsc_op_code *op_code)
423 : {
424 : struct wpabuf *msg;
425 :
426 142 : switch (wps->state) {
427 : case SEND_M1:
428 45 : msg = wps_build_m1(wps);
429 45 : *op_code = WSC_MSG;
430 45 : break;
431 : case SEND_M3:
432 29 : msg = wps_build_m3(wps);
433 29 : *op_code = WSC_MSG;
434 29 : break;
435 : case SEND_M5:
436 25 : msg = wps_build_m5(wps);
437 25 : *op_code = WSC_MSG;
438 25 : break;
439 : case SEND_M7:
440 23 : msg = wps_build_m7(wps);
441 23 : *op_code = WSC_MSG;
442 23 : break;
443 : case RECEIVED_M2D:
444 0 : if (wps->wps->ap) {
445 0 : msg = wps_build_wsc_nack(wps);
446 0 : *op_code = WSC_NACK;
447 0 : break;
448 : }
449 0 : msg = wps_build_wsc_ack(wps);
450 0 : *op_code = WSC_ACK;
451 0 : if (msg) {
452 : /* Another M2/M2D may be received */
453 0 : wps->state = RECV_M2;
454 : }
455 0 : break;
456 : case SEND_WSC_NACK:
457 13 : msg = wps_build_wsc_nack(wps);
458 13 : *op_code = WSC_NACK;
459 13 : break;
460 : case WPS_MSG_DONE:
461 7 : msg = wps_build_wsc_done(wps);
462 7 : *op_code = WSC_Done;
463 7 : break;
464 : default:
465 0 : wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
466 0 : "a message", wps->state);
467 0 : msg = NULL;
468 0 : break;
469 : }
470 :
471 142 : if (*op_code == WSC_MSG && msg) {
472 : /* Save a copy of the last message for Authenticator derivation
473 : */
474 122 : wpabuf_free(wps->last_msg);
475 122 : wps->last_msg = wpabuf_dup(msg);
476 : }
477 :
478 142 : return msg;
479 : }
480 :
481 :
482 35 : static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
483 : {
484 35 : if (r_nonce == NULL) {
485 0 : wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
486 0 : return -1;
487 : }
488 :
489 35 : os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN);
490 35 : wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
491 35 : wps->nonce_r, WPS_NONCE_LEN);
492 :
493 35 : return 0;
494 : }
495 :
496 :
497 97 : static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
498 : {
499 97 : if (e_nonce == NULL) {
500 0 : wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
501 0 : return -1;
502 : }
503 :
504 97 : if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) {
505 0 : wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received");
506 0 : return -1;
507 : }
508 :
509 97 : return 0;
510 : }
511 :
512 :
513 35 : static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r)
514 : {
515 35 : if (uuid_r == NULL) {
516 0 : wpa_printf(MSG_DEBUG, "WPS: No UUID-R received");
517 0 : return -1;
518 : }
519 :
520 35 : os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN);
521 35 : wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
522 :
523 35 : return 0;
524 : }
525 :
526 :
527 29 : static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
528 : size_t pk_len)
529 : {
530 29 : if (pk == NULL || pk_len == 0) {
531 0 : wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
532 0 : return -1;
533 : }
534 :
535 29 : if (wps->peer_pubkey_hash_set) {
536 : u8 hash[WPS_HASH_LEN];
537 0 : sha256_vector(1, &pk, &pk_len, hash);
538 0 : if (os_memcmp_const(hash, wps->peer_pubkey_hash,
539 : WPS_OOB_PUBKEY_HASH_LEN) != 0) {
540 0 : wpa_printf(MSG_ERROR, "WPS: Public Key hash mismatch");
541 0 : wpa_hexdump(MSG_DEBUG, "WPS: Received public key",
542 : pk, pk_len);
543 0 : wpa_hexdump(MSG_DEBUG, "WPS: Calculated public key "
544 : "hash", hash, WPS_OOB_PUBKEY_HASH_LEN);
545 0 : wpa_hexdump(MSG_DEBUG, "WPS: Expected public key hash",
546 0 : wps->peer_pubkey_hash,
547 : WPS_OOB_PUBKEY_HASH_LEN);
548 0 : wps->config_error = WPS_CFG_PUBLIC_KEY_HASH_MISMATCH;
549 0 : return -1;
550 : }
551 : }
552 :
553 29 : wpabuf_free(wps->dh_pubkey_r);
554 29 : wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len);
555 29 : if (wps->dh_pubkey_r == NULL)
556 0 : return -1;
557 :
558 29 : if (wps_derive_keys(wps) < 0)
559 0 : return -1;
560 :
561 29 : return 0;
562 : }
563 :
564 :
565 29 : static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1)
566 : {
567 29 : if (r_hash1 == NULL) {
568 0 : wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received");
569 0 : return -1;
570 : }
571 :
572 29 : os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN);
573 29 : wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN);
574 :
575 29 : return 0;
576 : }
577 :
578 :
579 29 : static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2)
580 : {
581 29 : if (r_hash2 == NULL) {
582 0 : wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received");
583 0 : return -1;
584 : }
585 :
586 29 : os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN);
587 29 : wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN);
588 :
589 29 : return 0;
590 : }
591 :
592 :
593 29 : 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 29 : if (r_snonce1 == NULL) {
600 0 : wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received");
601 0 : return -1;
602 : }
603 :
604 29 : 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 29 : addr[0] = r_snonce1;
609 29 : len[0] = WPS_SECRET_NONCE_LEN;
610 29 : addr[1] = wps->psk1;
611 29 : len[1] = WPS_PSK_LEN;
612 29 : addr[2] = wpabuf_head(wps->dh_pubkey_e);
613 29 : len[2] = wpabuf_len(wps->dh_pubkey_e);
614 29 : addr[3] = wpabuf_head(wps->dh_pubkey_r);
615 29 : len[3] = wpabuf_len(wps->dh_pubkey_r);
616 29 : hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
617 :
618 29 : if (os_memcmp_const(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
619 4 : wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does "
620 : "not match with the pre-committed value");
621 4 : wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
622 4 : wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr);
623 4 : return -1;
624 : }
625 :
626 25 : wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first "
627 : "half of the device password");
628 :
629 25 : return 0;
630 : }
631 :
632 :
633 25 : 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 25 : if (r_snonce2 == NULL) {
640 0 : wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received");
641 0 : return -1;
642 : }
643 :
644 25 : 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 25 : addr[0] = r_snonce2;
649 25 : len[0] = WPS_SECRET_NONCE_LEN;
650 25 : addr[1] = wps->psk2;
651 25 : len[1] = WPS_PSK_LEN;
652 25 : addr[2] = wpabuf_head(wps->dh_pubkey_e);
653 25 : len[2] = wpabuf_len(wps->dh_pubkey_e);
654 25 : addr[3] = wpabuf_head(wps->dh_pubkey_r);
655 25 : len[3] = wpabuf_len(wps->dh_pubkey_r);
656 25 : hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
657 :
658 25 : if (os_memcmp_const(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
659 2 : wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does "
660 : "not match with the pre-committed value");
661 2 : wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
662 2 : wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr);
663 2 : return -1;
664 : }
665 :
666 23 : wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second "
667 : "half of the device password");
668 :
669 23 : return 0;
670 : }
671 :
672 :
673 0 : 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 0 : int ret = 0;
679 :
680 0 : wpa_printf(MSG_DEBUG, "WPS: Received Credential");
681 0 : os_memset(&wps->cred, 0, sizeof(wps->cred));
682 0 : wpabuf_set(&msg, cred, cred_len);
683 0 : if (wps_parse_msg(&msg, &attr) < 0 ||
684 0 : wps_process_cred(&attr, &wps->cred))
685 0 : return -1;
686 :
687 0 : if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
688 : 0) {
689 0 : wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential ("
690 : MACSTR ") does not match with own address (" MACSTR
691 0 : ")", MAC2STR(wps->cred.mac_addr),
692 0 : 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 0 : if (!(wps->cred.encr_type &
710 : (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) {
711 0 : if (wps->cred.encr_type & WPS_ENCR_WEP) {
712 0 : wpa_printf(MSG_INFO, "WPS: Reject Credential "
713 : "due to WEP configuration");
714 0 : wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED;
715 0 : return -2;
716 : }
717 :
718 0 : wpa_printf(MSG_INFO, "WPS: Reject Credential due to "
719 0 : "invalid encr_type 0x%x", wps->cred.encr_type);
720 0 : return -1;
721 : }
722 :
723 0 : if (wps->wps->cred_cb) {
724 0 : wps->cred.cred_attr = cred - 4;
725 0 : wps->cred.cred_attr_len = cred_len + 4;
726 0 : ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
727 0 : wps->cred.cred_attr = NULL;
728 0 : wps->cred.cred_attr_len = 0;
729 : }
730 :
731 0 : return ret;
732 : }
733 :
734 :
735 8 : 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 8 : int ok = 0;
740 :
741 8 : if (wps->wps->ap)
742 8 : return 0;
743 :
744 0 : if (num_cred == 0) {
745 0 : wpa_printf(MSG_DEBUG, "WPS: No Credential attributes "
746 : "received");
747 0 : return -1;
748 : }
749 :
750 0 : for (i = 0; i < num_cred; i++) {
751 : int res;
752 0 : res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2);
753 0 : if (res == 0)
754 0 : ok++;
755 0 : else if (res == -2)
756 0 : wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped");
757 : else
758 0 : return -1;
759 : }
760 :
761 0 : if (ok == 0) {
762 0 : wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute "
763 : "received");
764 0 : return -1;
765 : }
766 :
767 0 : return 0;
768 : }
769 :
770 :
771 8 : 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 8 : if (!wps->wps->ap)
778 0 : return 0;
779 :
780 8 : if (wps_process_ap_settings(attr, &cred) < 0)
781 0 : return -1;
782 :
783 8 : wpa_printf(MSG_INFO, "WPS: Received new AP configuration from "
784 : "Registrar");
785 :
786 8 : if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
787 : 0) {
788 0 : wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings ("
789 : MACSTR ") does not match with own address (" MACSTR
790 0 : ")", MAC2STR(cred.mac_addr),
791 0 : 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 8 : if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES)))
809 : {
810 1 : if (cred.encr_type & WPS_ENCR_WEP) {
811 1 : wpa_printf(MSG_INFO, "WPS: Reject new AP settings "
812 : "due to WEP configuration");
813 1 : wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED;
814 1 : return -1;
815 : }
816 :
817 0 : wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to "
818 0 : "invalid encr_type 0x%x", cred.encr_type);
819 0 : 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 7 : if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP)
838 : {
839 1 : wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> "
840 : "TKIP+AES");
841 1 : cred.encr_type |= WPS_ENCR_AES;
842 : }
843 :
844 7 : if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
845 : WPS_AUTH_WPAPSK) {
846 1 : wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> "
847 : "WPAPSK+WPA2PSK");
848 1 : cred.auth_type |= WPS_AUTH_WPA2PSK;
849 : }
850 :
851 7 : if (wps->wps->cred_cb) {
852 7 : cred.cred_attr = wpabuf_head(attrs);
853 7 : cred.cred_attr_len = wpabuf_len(attrs);
854 7 : wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
855 : }
856 :
857 7 : return 0;
858 : }
859 :
860 :
861 35 : static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id)
862 : {
863 : u16 id;
864 :
865 35 : if (dev_pw_id == NULL) {
866 0 : wpa_printf(MSG_DEBUG, "WPS: Device Password ID");
867 0 : return -1;
868 : }
869 :
870 35 : id = WPA_GET_BE16(dev_pw_id);
871 35 : if (wps->dev_pw_id == id) {
872 35 : wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id);
873 35 : 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 0 : wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password "
895 0 : "ID from %u to %u", wps->dev_pw_id, id);
896 :
897 0 : if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) {
898 0 : wpa_printf(MSG_DEBUG,
899 : "WPS: Workaround - ignore PBC-to-PIN change");
900 0 : return 0;
901 : }
902 :
903 0 : if (wps->alt_dev_password && wps->alt_dev_pw_id == id) {
904 0 : wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password");
905 0 : bin_clear_free(wps->dev_password, wps->dev_password_len);
906 0 : wps->dev_pw_id = wps->alt_dev_pw_id;
907 0 : wps->dev_password = wps->alt_dev_password;
908 0 : wps->dev_password_len = wps->alt_dev_password_len;
909 0 : wps->alt_dev_password = NULL;
910 0 : wps->alt_dev_password_len = 0;
911 0 : return 0;
912 : }
913 :
914 0 : return -1;
915 : }
916 :
917 :
918 35 : 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 35 : wpa_printf(MSG_DEBUG, "WPS: Received M2");
923 :
924 35 : if (wps->state != RECV_M2) {
925 0 : wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
926 0 : "receiving M2", wps->state);
927 0 : wps->state = SEND_WSC_NACK;
928 0 : return WPS_CONTINUE;
929 : }
930 :
931 70 : if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
932 70 : wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
933 70 : wps_process_uuid_r(wps, attr->uuid_r) ||
934 35 : wps_process_dev_pw_id(wps, attr->dev_password_id)) {
935 0 : wps->state = SEND_WSC_NACK;
936 0 : 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 70 : if (wps->wps->ap &&
946 70 : ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) ||
947 32 : wps->dev_password == NULL)) {
948 6 : wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
949 : "registration of a new Registrar");
950 6 : wps->config_error = WPS_CFG_SETUP_LOCKED;
951 6 : wps->state = SEND_WSC_NACK;
952 6 : return WPS_CONTINUE;
953 : }
954 :
955 58 : if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
956 58 : wps_process_authenticator(wps, attr->authenticator, msg) ||
957 29 : wps_process_device_attrs(&wps->peer_dev, attr)) {
958 0 : wps->state = SEND_WSC_NACK;
959 0 : return WPS_CONTINUE;
960 : }
961 :
962 : #ifdef CONFIG_WPS_NFC
963 29 : if (wps->peer_pubkey_hash_set) {
964 : struct wpabuf *decrypted;
965 : struct wps_parse_attr eattr;
966 :
967 0 : decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
968 : attr->encr_settings_len);
969 0 : if (decrypted == NULL) {
970 0 : wpa_printf(MSG_DEBUG, "WPS: Failed to decrypt "
971 : "Encrypted Settings attribute");
972 0 : wps->state = SEND_WSC_NACK;
973 0 : return WPS_CONTINUE;
974 : }
975 :
976 0 : wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted "
977 : "Settings attribute");
978 0 : if (wps_parse_msg(decrypted, &eattr) < 0 ||
979 0 : wps_process_key_wrap_auth(wps, decrypted,
980 0 : eattr.key_wrap_auth) ||
981 0 : wps_process_creds(wps, eattr.cred, eattr.cred_len,
982 0 : eattr.num_cred, attr->version2 != NULL)) {
983 0 : wpabuf_free(decrypted);
984 0 : wps->state = SEND_WSC_NACK;
985 0 : return WPS_CONTINUE;
986 : }
987 0 : wpabuf_free(decrypted);
988 :
989 0 : wps->state = WPS_MSG_DONE;
990 0 : return WPS_CONTINUE;
991 : }
992 : #endif /* CONFIG_WPS_NFC */
993 :
994 29 : wps->state = SEND_M3;
995 29 : return WPS_CONTINUE;
996 : }
997 :
998 :
999 0 : static enum wps_process_res wps_process_m2d(struct wps_data *wps,
1000 : struct wps_parse_attr *attr)
1001 : {
1002 0 : wpa_printf(MSG_DEBUG, "WPS: Received M2D");
1003 :
1004 0 : if (wps->state != RECV_M2) {
1005 0 : wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1006 0 : "receiving M2D", wps->state);
1007 0 : wps->state = SEND_WSC_NACK;
1008 0 : return WPS_CONTINUE;
1009 : }
1010 :
1011 0 : wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
1012 0 : attr->manufacturer, attr->manufacturer_len);
1013 0 : wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
1014 0 : attr->model_name, attr->model_name_len);
1015 0 : wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
1016 0 : attr->model_number, attr->model_number_len);
1017 0 : wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
1018 0 : attr->serial_number, attr->serial_number_len);
1019 0 : wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
1020 0 : attr->dev_name, attr->dev_name_len);
1021 :
1022 0 : if (wps->wps->event_cb) {
1023 : union wps_event_data data;
1024 0 : struct wps_event_m2d *m2d = &data.m2d;
1025 0 : os_memset(&data, 0, sizeof(data));
1026 0 : if (attr->config_methods)
1027 0 : m2d->config_methods =
1028 0 : WPA_GET_BE16(attr->config_methods);
1029 0 : m2d->manufacturer = attr->manufacturer;
1030 0 : m2d->manufacturer_len = attr->manufacturer_len;
1031 0 : m2d->model_name = attr->model_name;
1032 0 : m2d->model_name_len = attr->model_name_len;
1033 0 : m2d->model_number = attr->model_number;
1034 0 : m2d->model_number_len = attr->model_number_len;
1035 0 : m2d->serial_number = attr->serial_number;
1036 0 : m2d->serial_number_len = attr->serial_number_len;
1037 0 : m2d->dev_name = attr->dev_name;
1038 0 : m2d->dev_name_len = attr->dev_name_len;
1039 0 : m2d->primary_dev_type = attr->primary_dev_type;
1040 0 : if (attr->config_error)
1041 0 : m2d->config_error =
1042 0 : WPA_GET_BE16(attr->config_error);
1043 0 : if (attr->dev_password_id)
1044 0 : m2d->dev_password_id =
1045 0 : WPA_GET_BE16(attr->dev_password_id);
1046 0 : wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
1047 : }
1048 :
1049 0 : wps->state = RECEIVED_M2D;
1050 0 : return WPS_CONTINUE;
1051 : }
1052 :
1053 :
1054 29 : 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 29 : wpa_printf(MSG_DEBUG, "WPS: Received M4");
1062 :
1063 29 : if (wps->state != RECV_M4) {
1064 0 : wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1065 0 : "receiving M4", wps->state);
1066 0 : wps->state = SEND_WSC_NACK;
1067 0 : return WPS_CONTINUE;
1068 : }
1069 :
1070 58 : if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1071 58 : wps_process_authenticator(wps, attr->authenticator, msg) ||
1072 58 : wps_process_r_hash1(wps, attr->r_hash1) ||
1073 29 : wps_process_r_hash2(wps, attr->r_hash2)) {
1074 0 : wps->state = SEND_WSC_NACK;
1075 0 : return WPS_CONTINUE;
1076 : }
1077 :
1078 29 : decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1079 : attr->encr_settings_len);
1080 29 : if (decrypted == NULL) {
1081 0 : wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1082 : "Settings attribute");
1083 0 : wps->state = SEND_WSC_NACK;
1084 0 : return WPS_CONTINUE;
1085 : }
1086 :
1087 29 : if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) {
1088 0 : wpabuf_free(decrypted);
1089 0 : wps->state = SEND_WSC_NACK;
1090 0 : return WPS_CONTINUE;
1091 : }
1092 :
1093 29 : wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1094 : "attribute");
1095 58 : if (wps_parse_msg(decrypted, &eattr) < 0 ||
1096 58 : wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1097 29 : wps_process_r_snonce1(wps, eattr.r_snonce1)) {
1098 4 : wpabuf_free(decrypted);
1099 4 : wps->state = SEND_WSC_NACK;
1100 4 : return WPS_CONTINUE;
1101 : }
1102 25 : wpabuf_free(decrypted);
1103 :
1104 25 : wps->state = SEND_M5;
1105 25 : return WPS_CONTINUE;
1106 : }
1107 :
1108 :
1109 25 : 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 25 : wpa_printf(MSG_DEBUG, "WPS: Received M6");
1117 :
1118 25 : if (wps->state != RECV_M6) {
1119 0 : wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1120 0 : "receiving M6", wps->state);
1121 0 : wps->state = SEND_WSC_NACK;
1122 0 : return WPS_CONTINUE;
1123 : }
1124 :
1125 50 : if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1126 25 : wps_process_authenticator(wps, attr->authenticator, msg)) {
1127 0 : wps->state = SEND_WSC_NACK;
1128 0 : return WPS_CONTINUE;
1129 : }
1130 :
1131 25 : decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1132 : attr->encr_settings_len);
1133 25 : if (decrypted == NULL) {
1134 0 : wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1135 : "Settings attribute");
1136 0 : wps->state = SEND_WSC_NACK;
1137 0 : return WPS_CONTINUE;
1138 : }
1139 :
1140 25 : if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) {
1141 0 : wpabuf_free(decrypted);
1142 0 : wps->state = SEND_WSC_NACK;
1143 0 : return WPS_CONTINUE;
1144 : }
1145 :
1146 25 : wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1147 : "attribute");
1148 50 : if (wps_parse_msg(decrypted, &eattr) < 0 ||
1149 50 : wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1150 25 : wps_process_r_snonce2(wps, eattr.r_snonce2)) {
1151 2 : wpabuf_free(decrypted);
1152 2 : wps->state = SEND_WSC_NACK;
1153 2 : return WPS_CONTINUE;
1154 : }
1155 23 : wpabuf_free(decrypted);
1156 :
1157 23 : if (wps->wps->ap)
1158 23 : wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS,
1159 : NULL);
1160 :
1161 23 : wps->state = SEND_M7;
1162 23 : return WPS_CONTINUE;
1163 : }
1164 :
1165 :
1166 8 : 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 8 : wpa_printf(MSG_DEBUG, "WPS: Received M8");
1174 :
1175 8 : if (wps->state != RECV_M8) {
1176 0 : wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1177 0 : "receiving M8", wps->state);
1178 0 : wps->state = SEND_WSC_NACK;
1179 0 : return WPS_CONTINUE;
1180 : }
1181 :
1182 16 : if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1183 8 : wps_process_authenticator(wps, attr->authenticator, msg)) {
1184 0 : wps->state = SEND_WSC_NACK;
1185 0 : return WPS_CONTINUE;
1186 : }
1187 :
1188 8 : 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 0 : wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
1195 : "registration of a new Registrar");
1196 0 : wps->config_error = WPS_CFG_SETUP_LOCKED;
1197 0 : wps->state = SEND_WSC_NACK;
1198 0 : return WPS_CONTINUE;
1199 : }
1200 :
1201 8 : decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1202 : attr->encr_settings_len);
1203 8 : if (decrypted == NULL) {
1204 0 : wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1205 : "Settings attribute");
1206 0 : wps->state = SEND_WSC_NACK;
1207 0 : return WPS_CONTINUE;
1208 : }
1209 :
1210 8 : if (wps_validate_m8_encr(decrypted, wps->wps->ap,
1211 8 : attr->version2 != NULL) < 0) {
1212 0 : wpabuf_free(decrypted);
1213 0 : wps->state = SEND_WSC_NACK;
1214 0 : return WPS_CONTINUE;
1215 : }
1216 :
1217 8 : wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1218 : "attribute");
1219 16 : if (wps_parse_msg(decrypted, &eattr) < 0 ||
1220 16 : wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1221 8 : wps_process_creds(wps, eattr.cred, eattr.cred_len,
1222 16 : eattr.num_cred, attr->version2 != NULL) ||
1223 8 : wps_process_ap_settings_e(wps, &eattr, decrypted,
1224 8 : attr->version2 != NULL)) {
1225 1 : wpabuf_free(decrypted);
1226 1 : wps->state = SEND_WSC_NACK;
1227 1 : return WPS_CONTINUE;
1228 : }
1229 7 : wpabuf_free(decrypted);
1230 :
1231 7 : wps->state = WPS_MSG_DONE;
1232 7 : return WPS_CONTINUE;
1233 : }
1234 :
1235 :
1236 97 : 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 97 : enum wps_process_res ret = WPS_CONTINUE;
1241 :
1242 97 : wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
1243 :
1244 97 : if (wps_parse_msg(msg, &attr) < 0)
1245 0 : return WPS_FAILURE;
1246 :
1247 194 : if (attr.enrollee_nonce == NULL ||
1248 97 : os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) {
1249 0 : wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1250 0 : return WPS_FAILURE;
1251 : }
1252 :
1253 97 : if (attr.msg_type == NULL) {
1254 0 : wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1255 0 : wps->state = SEND_WSC_NACK;
1256 0 : return WPS_CONTINUE;
1257 : }
1258 :
1259 97 : switch (*attr.msg_type) {
1260 : case WPS_M2:
1261 35 : if (wps_validate_m2(msg) < 0)
1262 0 : return WPS_FAILURE;
1263 35 : ret = wps_process_m2(wps, msg, &attr);
1264 35 : break;
1265 : case WPS_M2D:
1266 0 : if (wps_validate_m2d(msg) < 0)
1267 0 : return WPS_FAILURE;
1268 0 : ret = wps_process_m2d(wps, &attr);
1269 0 : break;
1270 : case WPS_M4:
1271 29 : if (wps_validate_m4(msg) < 0)
1272 0 : return WPS_FAILURE;
1273 29 : ret = wps_process_m4(wps, msg, &attr);
1274 29 : if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1275 4 : wps_fail_event(wps->wps, WPS_M4, wps->config_error,
1276 4 : wps->error_indication,
1277 4 : wps->peer_dev.mac_addr);
1278 29 : break;
1279 : case WPS_M6:
1280 25 : if (wps_validate_m6(msg) < 0)
1281 0 : return WPS_FAILURE;
1282 25 : ret = wps_process_m6(wps, msg, &attr);
1283 25 : if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1284 2 : wps_fail_event(wps->wps, WPS_M6, wps->config_error,
1285 2 : wps->error_indication,
1286 2 : wps->peer_dev.mac_addr);
1287 25 : break;
1288 : case WPS_M8:
1289 8 : if (wps_validate_m8(msg) < 0)
1290 0 : return WPS_FAILURE;
1291 8 : ret = wps_process_m8(wps, msg, &attr);
1292 8 : if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1293 1 : wps_fail_event(wps->wps, WPS_M8, wps->config_error,
1294 1 : wps->error_indication,
1295 1 : wps->peer_dev.mac_addr);
1296 8 : break;
1297 : default:
1298 0 : wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1299 0 : *attr.msg_type);
1300 0 : 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 97 : if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) {
1311 : /* Save a copy of the last message for Authenticator derivation
1312 : */
1313 97 : wpabuf_free(wps->last_msg);
1314 97 : wps->last_msg = wpabuf_dup(msg);
1315 : }
1316 :
1317 97 : return ret;
1318 : }
1319 :
1320 :
1321 6 : 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 6 : wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1327 :
1328 6 : if (wps_parse_msg(msg, &attr) < 0)
1329 0 : return WPS_FAILURE;
1330 :
1331 6 : if (attr.msg_type == NULL) {
1332 0 : wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1333 0 : return WPS_FAILURE;
1334 : }
1335 :
1336 6 : if (*attr.msg_type != WPS_WSC_ACK) {
1337 0 : wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1338 0 : *attr.msg_type);
1339 0 : return WPS_FAILURE;
1340 : }
1341 :
1342 12 : if (attr.registrar_nonce == NULL ||
1343 6 : os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0)
1344 : {
1345 0 : wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1346 0 : return WPS_FAILURE;
1347 : }
1348 :
1349 12 : if (attr.enrollee_nonce == NULL ||
1350 6 : os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) {
1351 0 : wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1352 0 : return WPS_FAILURE;
1353 : }
1354 :
1355 6 : if (wps->state == RECV_ACK && wps->wps->ap) {
1356 6 : wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
1357 : "completed successfully");
1358 6 : wps_success_event(wps->wps, wps->peer_dev.mac_addr);
1359 6 : wps->state = WPS_FINISHED;
1360 6 : return WPS_DONE;
1361 : }
1362 :
1363 0 : return WPS_FAILURE;
1364 : }
1365 :
1366 :
1367 28 : 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 28 : wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1374 :
1375 28 : if (wps_parse_msg(msg, &attr) < 0)
1376 0 : return WPS_FAILURE;
1377 :
1378 28 : if (attr.msg_type == NULL) {
1379 0 : wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1380 0 : return WPS_FAILURE;
1381 : }
1382 :
1383 28 : if (*attr.msg_type != WPS_WSC_NACK) {
1384 0 : wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1385 0 : *attr.msg_type);
1386 0 : return WPS_FAILURE;
1387 : }
1388 :
1389 56 : if (attr.registrar_nonce == NULL ||
1390 28 : os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0)
1391 : {
1392 0 : wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1393 0 : wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
1394 0 : attr.registrar_nonce, WPS_NONCE_LEN);
1395 0 : wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
1396 0 : wps->nonce_r, WPS_NONCE_LEN);
1397 0 : return WPS_FAILURE;
1398 : }
1399 :
1400 56 : if (attr.enrollee_nonce == NULL ||
1401 28 : os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) {
1402 0 : wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1403 0 : wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
1404 0 : attr.enrollee_nonce, WPS_NONCE_LEN);
1405 0 : wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
1406 0 : wps->nonce_e, WPS_NONCE_LEN);
1407 0 : return WPS_FAILURE;
1408 : }
1409 :
1410 28 : if (attr.config_error == NULL) {
1411 0 : wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1412 : "in WSC_NACK");
1413 0 : return WPS_FAILURE;
1414 : }
1415 :
1416 28 : config_error = WPA_GET_BE16(attr.config_error);
1417 28 : wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
1418 : "Configuration Error %d", config_error);
1419 :
1420 28 : switch (wps->state) {
1421 : case RECV_M4:
1422 0 : wps_fail_event(wps->wps, WPS_M3, config_error,
1423 0 : wps->error_indication, wps->peer_dev.mac_addr);
1424 0 : break;
1425 : case RECV_M6:
1426 0 : wps_fail_event(wps->wps, WPS_M5, config_error,
1427 0 : wps->error_indication, wps->peer_dev.mac_addr);
1428 0 : break;
1429 : case RECV_M8:
1430 15 : wps_fail_event(wps->wps, WPS_M7, config_error,
1431 15 : wps->error_indication, wps->peer_dev.mac_addr);
1432 15 : break;
1433 : default:
1434 13 : break;
1435 : }
1436 :
1437 : /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
1438 : * Enrollee is Authenticator */
1439 28 : wps->state = SEND_WSC_NACK;
1440 :
1441 28 : return WPS_FAILURE;
1442 : }
1443 :
1444 :
1445 131 : 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 131 : wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1451 : "op_code=%d)",
1452 : (unsigned long) wpabuf_len(msg), op_code);
1453 :
1454 131 : if (op_code == WSC_UPnP) {
1455 : /* Determine the OpCode based on message type attribute */
1456 : struct wps_parse_attr attr;
1457 8 : if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) {
1458 8 : if (*attr.msg_type == WPS_WSC_ACK)
1459 0 : op_code = WSC_ACK;
1460 8 : else if (*attr.msg_type == WPS_WSC_NACK)
1461 1 : op_code = WSC_NACK;
1462 : }
1463 : }
1464 :
1465 131 : switch (op_code) {
1466 : case WSC_MSG:
1467 : case WSC_UPnP:
1468 97 : return wps_process_wsc_msg(wps, msg);
1469 : case WSC_ACK:
1470 6 : if (wps_validate_wsc_ack(msg) < 0)
1471 0 : return WPS_FAILURE;
1472 6 : return wps_process_wsc_ack(wps, msg);
1473 : case WSC_NACK:
1474 28 : if (wps_validate_wsc_nack(msg) < 0)
1475 0 : return WPS_FAILURE;
1476 28 : return wps_process_wsc_nack(wps, msg);
1477 : default:
1478 0 : wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
1479 0 : return WPS_FAILURE;
1480 : }
1481 : }
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