Line data Source code
1 : /*
2 : * Wi-Fi Protected Setup - common functionality
3 : * Copyright (c) 2008-2012, 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 "common/defs.h"
13 : #include "common/ieee802_11_common.h"
14 : #include "crypto/aes_wrap.h"
15 : #include "crypto/crypto.h"
16 : #include "crypto/dh_group5.h"
17 : #include "crypto/sha1.h"
18 : #include "crypto/sha256.h"
19 : #include "crypto/random.h"
20 : #include "wps_i.h"
21 : #include "wps_dev_attr.h"
22 :
23 :
24 775 : void wps_kdf(const u8 *key, const u8 *label_prefix, size_t label_prefix_len,
25 : const char *label, u8 *res, size_t res_len)
26 : {
27 : u8 i_buf[4], key_bits[4];
28 : const u8 *addr[4];
29 : size_t len[4];
30 : int i, iter;
31 : u8 hash[SHA256_MAC_LEN], *opos;
32 : size_t left;
33 :
34 775 : WPA_PUT_BE32(key_bits, res_len * 8);
35 :
36 775 : addr[0] = i_buf;
37 775 : len[0] = sizeof(i_buf);
38 775 : addr[1] = label_prefix;
39 775 : len[1] = label_prefix_len;
40 775 : addr[2] = (const u8 *) label;
41 775 : len[2] = os_strlen(label);
42 775 : addr[3] = key_bits;
43 775 : len[3] = sizeof(key_bits);
44 :
45 775 : iter = (res_len + SHA256_MAC_LEN - 1) / SHA256_MAC_LEN;
46 775 : opos = res;
47 775 : left = res_len;
48 :
49 3100 : for (i = 1; i <= iter; i++) {
50 2325 : WPA_PUT_BE32(i_buf, i);
51 2325 : hmac_sha256_vector(key, SHA256_MAC_LEN, 4, addr, len, hash);
52 2325 : if (i < iter) {
53 1550 : os_memcpy(opos, hash, SHA256_MAC_LEN);
54 1550 : opos += SHA256_MAC_LEN;
55 1550 : left -= SHA256_MAC_LEN;
56 : } else
57 775 : os_memcpy(opos, hash, left);
58 : }
59 775 : }
60 :
61 :
62 776 : int wps_derive_keys(struct wps_data *wps)
63 : {
64 : struct wpabuf *pubkey, *dh_shared;
65 : u8 dhkey[SHA256_MAC_LEN], kdk[SHA256_MAC_LEN];
66 : const u8 *addr[3];
67 : size_t len[3];
68 : u8 keys[WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN + WPS_EMSK_LEN];
69 :
70 776 : if (wps->dh_privkey == NULL) {
71 0 : wpa_printf(MSG_DEBUG, "WPS: Own DH private key not available");
72 0 : return -1;
73 : }
74 :
75 776 : pubkey = wps->registrar ? wps->dh_pubkey_e : wps->dh_pubkey_r;
76 776 : if (pubkey == NULL) {
77 0 : wpa_printf(MSG_DEBUG, "WPS: Peer DH public key not available");
78 0 : return -1;
79 : }
80 :
81 776 : wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH Private Key", wps->dh_privkey);
82 776 : wpa_hexdump_buf(MSG_DEBUG, "WPS: DH peer Public Key", pubkey);
83 776 : dh_shared = dh5_derive_shared(wps->dh_ctx, pubkey, wps->dh_privkey);
84 776 : dh5_free(wps->dh_ctx);
85 776 : wps->dh_ctx = NULL;
86 776 : dh_shared = wpabuf_zeropad(dh_shared, 192);
87 776 : if (dh_shared == NULL) {
88 1 : wpa_printf(MSG_DEBUG, "WPS: Failed to derive DH shared key");
89 1 : return -1;
90 : }
91 :
92 : /* Own DH private key is not needed anymore */
93 775 : wpabuf_free(wps->dh_privkey);
94 775 : wps->dh_privkey = NULL;
95 :
96 775 : wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH shared key", dh_shared);
97 :
98 : /* DHKey = SHA-256(g^AB mod p) */
99 775 : addr[0] = wpabuf_head(dh_shared);
100 775 : len[0] = wpabuf_len(dh_shared);
101 775 : sha256_vector(1, addr, len, dhkey);
102 775 : wpa_hexdump_key(MSG_DEBUG, "WPS: DHKey", dhkey, sizeof(dhkey));
103 775 : wpabuf_free(dh_shared);
104 :
105 : /* KDK = HMAC-SHA-256_DHKey(N1 || EnrolleeMAC || N2) */
106 775 : addr[0] = wps->nonce_e;
107 775 : len[0] = WPS_NONCE_LEN;
108 775 : addr[1] = wps->mac_addr_e;
109 775 : len[1] = ETH_ALEN;
110 775 : addr[2] = wps->nonce_r;
111 775 : len[2] = WPS_NONCE_LEN;
112 775 : hmac_sha256_vector(dhkey, sizeof(dhkey), 3, addr, len, kdk);
113 775 : wpa_hexdump_key(MSG_DEBUG, "WPS: KDK", kdk, sizeof(kdk));
114 :
115 775 : wps_kdf(kdk, NULL, 0, "Wi-Fi Easy and Secure Key Derivation",
116 : keys, sizeof(keys));
117 775 : os_memcpy(wps->authkey, keys, WPS_AUTHKEY_LEN);
118 775 : os_memcpy(wps->keywrapkey, keys + WPS_AUTHKEY_LEN, WPS_KEYWRAPKEY_LEN);
119 775 : os_memcpy(wps->emsk, keys + WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN,
120 : WPS_EMSK_LEN);
121 :
122 775 : wpa_hexdump_key(MSG_DEBUG, "WPS: AuthKey",
123 775 : wps->authkey, WPS_AUTHKEY_LEN);
124 775 : wpa_hexdump_key(MSG_DEBUG, "WPS: KeyWrapKey",
125 775 : wps->keywrapkey, WPS_KEYWRAPKEY_LEN);
126 775 : wpa_hexdump_key(MSG_DEBUG, "WPS: EMSK", wps->emsk, WPS_EMSK_LEN);
127 :
128 775 : return 0;
129 : }
130 :
131 :
132 689 : void wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
133 : size_t dev_passwd_len)
134 : {
135 : u8 hash[SHA256_MAC_LEN];
136 :
137 689 : hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd,
138 689 : (dev_passwd_len + 1) / 2, hash);
139 689 : os_memcpy(wps->psk1, hash, WPS_PSK_LEN);
140 1378 : hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN,
141 689 : dev_passwd + (dev_passwd_len + 1) / 2,
142 : dev_passwd_len / 2, hash);
143 689 : os_memcpy(wps->psk2, hash, WPS_PSK_LEN);
144 :
145 689 : wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Device Password",
146 : dev_passwd, dev_passwd_len);
147 689 : wpa_hexdump_key(MSG_DEBUG, "WPS: PSK1", wps->psk1, WPS_PSK_LEN);
148 689 : wpa_hexdump_key(MSG_DEBUG, "WPS: PSK2", wps->psk2, WPS_PSK_LEN);
149 689 : }
150 :
151 :
152 1517 : struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr,
153 : size_t encr_len)
154 : {
155 : struct wpabuf *decrypted;
156 1517 : const size_t block_size = 16;
157 : size_t i;
158 : u8 pad;
159 : const u8 *pos;
160 :
161 : /* AES-128-CBC */
162 1517 : if (encr == NULL || encr_len < 2 * block_size || encr_len % block_size)
163 : {
164 5 : wpa_printf(MSG_DEBUG, "WPS: No Encrypted Settings received");
165 5 : return NULL;
166 : }
167 :
168 1512 : decrypted = wpabuf_alloc(encr_len - block_size);
169 1512 : if (decrypted == NULL)
170 1 : return NULL;
171 :
172 1511 : wpa_hexdump(MSG_MSGDUMP, "WPS: Encrypted Settings", encr, encr_len);
173 1511 : wpabuf_put_data(decrypted, encr + block_size, encr_len - block_size);
174 1511 : if (aes_128_cbc_decrypt(wps->keywrapkey, encr, wpabuf_mhead(decrypted),
175 : wpabuf_len(decrypted))) {
176 0 : wpabuf_free(decrypted);
177 0 : return NULL;
178 : }
179 :
180 1511 : wpa_hexdump_buf_key(MSG_MSGDUMP, "WPS: Decrypted Encrypted Settings",
181 : decrypted);
182 :
183 1511 : pos = wpabuf_head_u8(decrypted) + wpabuf_len(decrypted) - 1;
184 1511 : pad = *pos;
185 1511 : if (pad > wpabuf_len(decrypted)) {
186 1 : wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad value");
187 1 : wpabuf_free(decrypted);
188 1 : return NULL;
189 : }
190 22463 : for (i = 0; i < pad; i++) {
191 20954 : if (*pos-- != pad) {
192 1 : wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad "
193 : "string");
194 1 : wpabuf_free(decrypted);
195 1 : return NULL;
196 : }
197 : }
198 1509 : decrypted->used -= pad;
199 :
200 1509 : return decrypted;
201 : }
202 :
203 :
204 : /**
205 : * wps_pin_checksum - Compute PIN checksum
206 : * @pin: Seven digit PIN (i.e., eight digit PIN without the checksum digit)
207 : * Returns: Checksum digit
208 : */
209 274 : unsigned int wps_pin_checksum(unsigned int pin)
210 : {
211 274 : unsigned int accum = 0;
212 1623 : while (pin) {
213 1075 : accum += 3 * (pin % 10);
214 1075 : pin /= 10;
215 1075 : accum += pin % 10;
216 1075 : pin /= 10;
217 : }
218 :
219 274 : return (10 - accum % 10) % 10;
220 : }
221 :
222 :
223 : /**
224 : * wps_pin_valid - Check whether a PIN has a valid checksum
225 : * @pin: Eight digit PIN (i.e., including the checksum digit)
226 : * Returns: 1 if checksum digit is valid, or 0 if not
227 : */
228 20 : unsigned int wps_pin_valid(unsigned int pin)
229 : {
230 20 : return wps_pin_checksum(pin / 10) == (pin % 10);
231 : }
232 :
233 :
234 : /**
235 : * wps_generate_pin - Generate a random PIN
236 : * Returns: Eight digit PIN (i.e., including the checksum digit)
237 : */
238 254 : unsigned int wps_generate_pin(void)
239 : {
240 : unsigned int val;
241 :
242 : /* Generate seven random digits for the PIN */
243 254 : if (random_get_bytes((unsigned char *) &val, sizeof(val)) < 0) {
244 : struct os_time now;
245 1 : os_get_time(&now);
246 1 : val = os_random() ^ now.sec ^ now.usec;
247 : }
248 254 : val %= 10000000;
249 :
250 : /* Append checksum digit */
251 254 : return val * 10 + wps_pin_checksum(val);
252 : }
253 :
254 :
255 236 : int wps_pin_str_valid(const char *pin)
256 : {
257 : const char *p;
258 : size_t len;
259 :
260 236 : p = pin;
261 2359 : while (*p >= '0' && *p <= '9')
262 1887 : p++;
263 236 : if (*p != '\0')
264 1 : return 0;
265 :
266 235 : len = p - pin;
267 235 : return len == 4 || len == 8;
268 : }
269 :
270 :
271 189 : void wps_fail_event(struct wps_context *wps, enum wps_msg_type msg,
272 : u16 config_error, u16 error_indication, const u8 *mac_addr)
273 : {
274 : union wps_event_data data;
275 :
276 189 : if (wps->event_cb == NULL)
277 189 : return;
278 :
279 189 : os_memset(&data, 0, sizeof(data));
280 189 : data.fail.msg = msg;
281 189 : data.fail.config_error = config_error;
282 189 : data.fail.error_indication = error_indication;
283 189 : os_memcpy(data.fail.peer_macaddr, mac_addr, ETH_ALEN);
284 189 : wps->event_cb(wps->cb_ctx, WPS_EV_FAIL, &data);
285 : }
286 :
287 :
288 504 : void wps_success_event(struct wps_context *wps, const u8 *mac_addr)
289 : {
290 : union wps_event_data data;
291 :
292 504 : if (wps->event_cb == NULL)
293 504 : return;
294 :
295 504 : os_memset(&data, 0, sizeof(data));
296 504 : os_memcpy(data.success.peer_macaddr, mac_addr, ETH_ALEN);
297 504 : wps->event_cb(wps->cb_ctx, WPS_EV_SUCCESS, &data);
298 : }
299 :
300 :
301 17 : void wps_pwd_auth_fail_event(struct wps_context *wps, int enrollee, int part,
302 : const u8 *mac_addr)
303 : {
304 : union wps_event_data data;
305 :
306 17 : if (wps->event_cb == NULL)
307 17 : return;
308 :
309 17 : os_memset(&data, 0, sizeof(data));
310 17 : data.pwd_auth_fail.enrollee = enrollee;
311 17 : data.pwd_auth_fail.part = part;
312 17 : os_memcpy(data.pwd_auth_fail.peer_macaddr, mac_addr, ETH_ALEN);
313 17 : wps->event_cb(wps->cb_ctx, WPS_EV_PWD_AUTH_FAIL, &data);
314 : }
315 :
316 :
317 13 : void wps_pbc_overlap_event(struct wps_context *wps)
318 : {
319 13 : if (wps->event_cb == NULL)
320 13 : return;
321 :
322 13 : wps->event_cb(wps->cb_ctx, WPS_EV_PBC_OVERLAP, NULL);
323 : }
324 :
325 :
326 7 : void wps_pbc_timeout_event(struct wps_context *wps)
327 : {
328 7 : if (wps->event_cb == NULL)
329 7 : return;
330 :
331 7 : wps->event_cb(wps->cb_ctx, WPS_EV_PBC_TIMEOUT, NULL);
332 : }
333 :
334 :
335 117 : void wps_pbc_active_event(struct wps_context *wps)
336 : {
337 117 : if (wps->event_cb == NULL)
338 117 : return;
339 :
340 117 : wps->event_cb(wps->cb_ctx, WPS_EV_PBC_ACTIVE, NULL);
341 : }
342 :
343 :
344 52 : void wps_pbc_disable_event(struct wps_context *wps)
345 : {
346 52 : if (wps->event_cb == NULL)
347 52 : return;
348 :
349 52 : wps->event_cb(wps->cb_ctx, WPS_EV_PBC_DISABLE, NULL);
350 : }
351 :
352 :
353 : #ifdef CONFIG_WPS_OOB
354 :
355 4 : struct wpabuf * wps_get_oob_cred(struct wps_context *wps, int rf_band,
356 : int channel)
357 : {
358 : struct wps_data data;
359 : struct wpabuf *plain;
360 :
361 4 : plain = wpabuf_alloc(500);
362 4 : if (plain == NULL) {
363 1 : wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
364 : "credential");
365 1 : return NULL;
366 : }
367 :
368 3 : os_memset(&data, 0, sizeof(data));
369 3 : data.wps = wps;
370 3 : data.auth_type = wps->auth_types;
371 3 : data.encr_type = wps->encr_types;
372 3 : if (wps_build_cred(&data, plain) ||
373 3 : (rf_band && wps_build_rf_bands_attr(plain, rf_band)) ||
374 6 : (channel && wps_build_ap_channel(plain, channel)) ||
375 6 : wps_build_mac_addr(plain, wps->dev.mac_addr) ||
376 3 : wps_build_wfa_ext(plain, 0, NULL, 0)) {
377 0 : os_free(data.new_psk);
378 0 : wpabuf_free(plain);
379 0 : return NULL;
380 : }
381 :
382 4 : if (wps->wps_state == WPS_STATE_NOT_CONFIGURED && data.new_psk &&
383 1 : wps->ap) {
384 : struct wps_credential cred;
385 :
386 1 : wpa_printf(MSG_DEBUG, "WPS: Moving to Configured state based "
387 : "on credential token generation");
388 :
389 1 : os_memset(&cred, 0, sizeof(cred));
390 1 : os_memcpy(cred.ssid, wps->ssid, wps->ssid_len);
391 1 : cred.ssid_len = wps->ssid_len;
392 1 : cred.auth_type = WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK;
393 1 : cred.encr_type = WPS_ENCR_TKIP | WPS_ENCR_AES;
394 1 : os_memcpy(cred.key, data.new_psk, data.new_psk_len);
395 1 : cred.key_len = data.new_psk_len;
396 :
397 1 : wps->wps_state = WPS_STATE_CONFIGURED;
398 2 : wpa_hexdump_ascii_key(MSG_DEBUG,
399 : "WPS: Generated random passphrase",
400 1 : data.new_psk, data.new_psk_len);
401 1 : if (wps->cred_cb)
402 1 : wps->cred_cb(wps->cb_ctx, &cred);
403 : }
404 :
405 3 : os_free(data.new_psk);
406 :
407 3 : return plain;
408 : }
409 :
410 :
411 18 : struct wpabuf * wps_build_nfc_pw_token(u16 dev_pw_id,
412 : const struct wpabuf *pubkey,
413 : const struct wpabuf *dev_pw)
414 : {
415 : struct wpabuf *data;
416 :
417 18 : data = wpabuf_alloc(200);
418 18 : if (data == NULL)
419 1 : return NULL;
420 :
421 34 : if (wps_build_oob_dev_pw(data, dev_pw_id, pubkey,
422 34 : wpabuf_head(dev_pw), wpabuf_len(dev_pw)) ||
423 17 : wps_build_wfa_ext(data, 0, NULL, 0)) {
424 0 : wpa_printf(MSG_ERROR, "WPS: Failed to build NFC password "
425 : "token");
426 0 : wpabuf_free(data);
427 0 : return NULL;
428 : }
429 :
430 17 : return data;
431 : }
432 :
433 :
434 8 : int wps_oob_use_cred(struct wps_context *wps, struct wps_parse_attr *attr)
435 : {
436 : struct wpabuf msg;
437 : size_t i;
438 :
439 12 : for (i = 0; i < attr->num_cred; i++) {
440 : struct wps_credential local_cred;
441 : struct wps_parse_attr cattr;
442 :
443 8 : os_memset(&local_cred, 0, sizeof(local_cred));
444 8 : wpabuf_set(&msg, attr->cred[i], attr->cred_len[i]);
445 14 : if (wps_parse_msg(&msg, &cattr) < 0 ||
446 6 : wps_process_cred(&cattr, &local_cred)) {
447 4 : wpa_printf(MSG_ERROR, "WPS: Failed to parse OOB "
448 : "credential");
449 4 : return -1;
450 : }
451 4 : wps->cred_cb(wps->cb_ctx, &local_cred);
452 : }
453 :
454 4 : return 0;
455 : }
456 :
457 :
458 : #endif /* CONFIG_WPS_OOB */
459 :
460 :
461 52 : int wps_dev_type_str2bin(const char *str, u8 dev_type[WPS_DEV_TYPE_LEN])
462 : {
463 : const char *pos;
464 :
465 : /* <categ>-<OUI>-<subcateg> */
466 52 : WPA_PUT_BE16(dev_type, atoi(str));
467 52 : pos = os_strchr(str, '-');
468 52 : if (pos == NULL)
469 2 : return -1;
470 50 : pos++;
471 50 : if (hexstr2bin(pos, &dev_type[2], 4))
472 1 : return -1;
473 49 : pos = os_strchr(pos, '-');
474 49 : if (pos == NULL)
475 1 : return -1;
476 48 : pos++;
477 48 : WPA_PUT_BE16(&dev_type[6], atoi(pos));
478 :
479 :
480 48 : return 0;
481 : }
482 :
483 :
484 13456 : char * wps_dev_type_bin2str(const u8 dev_type[WPS_DEV_TYPE_LEN], char *buf,
485 : size_t buf_len)
486 : {
487 : int ret;
488 :
489 26912 : ret = os_snprintf(buf, buf_len, "%u-%08X-%u",
490 13456 : WPA_GET_BE16(dev_type), WPA_GET_BE32(&dev_type[2]),
491 13456 : WPA_GET_BE16(&dev_type[6]));
492 13456 : if (os_snprintf_error(buf_len, ret))
493 0 : return NULL;
494 :
495 13456 : return buf;
496 : }
497 :
498 :
499 458 : void uuid_gen_mac_addr(const u8 *mac_addr, u8 *uuid)
500 : {
501 : const u8 *addr[2];
502 : size_t len[2];
503 : u8 hash[SHA1_MAC_LEN];
504 458 : u8 nsid[16] = {
505 : 0x52, 0x64, 0x80, 0xf8,
506 : 0xc9, 0x9b,
507 : 0x4b, 0xe5,
508 : 0xa6, 0x55,
509 : 0x58, 0xed, 0x5f, 0x5d, 0x60, 0x84
510 : };
511 :
512 458 : addr[0] = nsid;
513 458 : len[0] = sizeof(nsid);
514 458 : addr[1] = mac_addr;
515 458 : len[1] = 6;
516 458 : sha1_vector(2, addr, len, hash);
517 458 : os_memcpy(uuid, hash, 16);
518 :
519 : /* Version: 5 = named-based version using SHA-1 */
520 458 : uuid[6] = (5 << 4) | (uuid[6] & 0x0f);
521 :
522 : /* Variant specified in RFC 4122 */
523 458 : uuid[8] = 0x80 | (uuid[8] & 0x3f);
524 458 : }
525 :
526 :
527 1185 : u16 wps_config_methods_str2bin(const char *str)
528 : {
529 1185 : u16 methods = 0;
530 :
531 1185 : if (str == NULL || str[0] == '\0') {
532 : /* Default to enabling methods based on build configuration */
533 1126 : methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
534 1126 : methods |= WPS_CONFIG_VIRT_DISPLAY;
535 : #ifdef CONFIG_WPS_NFC
536 1126 : methods |= WPS_CONFIG_NFC_INTERFACE;
537 : #endif /* CONFIG_WPS_NFC */
538 : #ifdef CONFIG_P2P
539 910 : methods |= WPS_CONFIG_P2PS;
540 : #endif /* CONFIG_P2P */
541 : } else {
542 59 : if (os_strstr(str, "ethernet"))
543 1 : methods |= WPS_CONFIG_ETHERNET;
544 59 : if (os_strstr(str, "label"))
545 39 : methods |= WPS_CONFIG_LABEL;
546 59 : if (os_strstr(str, "display"))
547 21 : methods |= WPS_CONFIG_DISPLAY;
548 59 : if (os_strstr(str, "ext_nfc_token"))
549 1 : methods |= WPS_CONFIG_EXT_NFC_TOKEN;
550 59 : if (os_strstr(str, "int_nfc_token"))
551 1 : methods |= WPS_CONFIG_INT_NFC_TOKEN;
552 59 : if (os_strstr(str, "nfc_interface"))
553 15 : methods |= WPS_CONFIG_NFC_INTERFACE;
554 59 : if (os_strstr(str, "push_button"))
555 42 : methods |= WPS_CONFIG_PUSHBUTTON;
556 59 : if (os_strstr(str, "keypad"))
557 17 : methods |= WPS_CONFIG_KEYPAD;
558 59 : if (os_strstr(str, "virtual_display"))
559 17 : methods |= WPS_CONFIG_VIRT_DISPLAY;
560 59 : if (os_strstr(str, "physical_display"))
561 1 : methods |= WPS_CONFIG_PHY_DISPLAY;
562 59 : if (os_strstr(str, "virtual_push_button"))
563 2 : methods |= WPS_CONFIG_VIRT_PUSHBUTTON;
564 59 : if (os_strstr(str, "physical_push_button"))
565 1 : methods |= WPS_CONFIG_PHY_PUSHBUTTON;
566 59 : if (os_strstr(str, "p2ps"))
567 13 : methods |= WPS_CONFIG_P2PS;
568 : }
569 :
570 1185 : return methods;
571 : }
572 :
573 :
574 35 : struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
575 : {
576 : struct wpabuf *msg;
577 :
578 35 : wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
579 :
580 35 : msg = wpabuf_alloc(1000);
581 35 : if (msg == NULL)
582 0 : return NULL;
583 :
584 70 : if (wps_build_version(msg) ||
585 70 : wps_build_msg_type(msg, WPS_WSC_ACK) ||
586 70 : wps_build_enrollee_nonce(wps, msg) ||
587 70 : wps_build_registrar_nonce(wps, msg) ||
588 35 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
589 0 : wpabuf_free(msg);
590 0 : return NULL;
591 : }
592 :
593 35 : return msg;
594 : }
595 :
596 :
597 144 : struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
598 : {
599 : struct wpabuf *msg;
600 :
601 144 : wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
602 :
603 144 : msg = wpabuf_alloc(1000);
604 144 : if (msg == NULL)
605 0 : return NULL;
606 :
607 288 : if (wps_build_version(msg) ||
608 288 : wps_build_msg_type(msg, WPS_WSC_NACK) ||
609 288 : wps_build_enrollee_nonce(wps, msg) ||
610 288 : wps_build_registrar_nonce(wps, msg) ||
611 288 : wps_build_config_error(msg, wps->config_error) ||
612 144 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
613 0 : wpabuf_free(msg);
614 0 : return NULL;
615 : }
616 :
617 144 : return msg;
618 : }
619 :
620 :
621 : #ifdef CONFIG_WPS_NFC
622 :
623 18 : struct wpabuf * wps_nfc_token_build(int ndef, int id, struct wpabuf *pubkey,
624 : struct wpabuf *dev_pw)
625 : {
626 : struct wpabuf *ret;
627 :
628 18 : if (pubkey == NULL || dev_pw == NULL)
629 0 : return NULL;
630 :
631 18 : ret = wps_build_nfc_pw_token(id, pubkey, dev_pw);
632 18 : if (ndef && ret) {
633 : struct wpabuf *tmp;
634 15 : tmp = ndef_build_wifi(ret);
635 15 : wpabuf_free(ret);
636 15 : if (tmp == NULL)
637 1 : return NULL;
638 14 : ret = tmp;
639 : }
640 :
641 17 : return ret;
642 : }
643 :
644 :
645 40 : int wps_nfc_gen_dh(struct wpabuf **pubkey, struct wpabuf **privkey)
646 : {
647 40 : struct wpabuf *priv = NULL, *pub = NULL;
648 : void *dh_ctx;
649 :
650 40 : dh_ctx = dh5_init(&priv, &pub);
651 40 : if (dh_ctx == NULL)
652 2 : return -1;
653 38 : pub = wpabuf_zeropad(pub, 192);
654 38 : if (pub == NULL) {
655 0 : wpabuf_free(priv);
656 0 : return -1;
657 : }
658 38 : wpa_hexdump_buf(MSG_DEBUG, "WPS: Generated new DH pubkey", pub);
659 38 : dh5_free(dh_ctx);
660 :
661 38 : wpabuf_free(*pubkey);
662 38 : *pubkey = pub;
663 38 : wpabuf_free(*privkey);
664 38 : *privkey = priv;
665 :
666 38 : return 0;
667 : }
668 :
669 :
670 23 : struct wpabuf * wps_nfc_token_gen(int ndef, int *id, struct wpabuf **pubkey,
671 : struct wpabuf **privkey,
672 : struct wpabuf **dev_pw)
673 : {
674 : struct wpabuf *pw;
675 : u16 val;
676 :
677 23 : pw = wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN);
678 23 : if (pw == NULL)
679 1 : return NULL;
680 :
681 22 : if (random_get_bytes(wpabuf_put(pw, WPS_OOB_DEVICE_PASSWORD_LEN),
682 21 : WPS_OOB_DEVICE_PASSWORD_LEN) ||
683 21 : random_get_bytes((u8 *) &val, sizeof(val))) {
684 2 : wpabuf_free(pw);
685 2 : return NULL;
686 : }
687 :
688 20 : if (wps_nfc_gen_dh(pubkey, privkey) < 0) {
689 2 : wpabuf_free(pw);
690 2 : return NULL;
691 : }
692 :
693 18 : *id = 0x10 + val % 0xfff0;
694 18 : wpabuf_free(*dev_pw);
695 18 : *dev_pw = pw;
696 :
697 18 : return wps_nfc_token_build(ndef, *id, *pubkey, *dev_pw);
698 : }
699 :
700 :
701 14 : struct wpabuf * wps_build_nfc_handover_req(struct wps_context *ctx,
702 : struct wpabuf *nfc_dh_pubkey)
703 : {
704 : struct wpabuf *msg;
705 : void *len;
706 :
707 14 : if (ctx == NULL)
708 0 : return NULL;
709 :
710 14 : wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
711 : "handover request");
712 :
713 14 : if (nfc_dh_pubkey == NULL) {
714 0 : wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
715 : "configured");
716 0 : return NULL;
717 : }
718 :
719 14 : msg = wpabuf_alloc(1000);
720 14 : if (msg == NULL)
721 1 : return msg;
722 13 : len = wpabuf_put(msg, 2);
723 :
724 13 : if (wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
725 13 : nfc_dh_pubkey, NULL, 0) ||
726 26 : wps_build_uuid_e(msg, ctx->uuid) ||
727 13 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
728 0 : wpabuf_free(msg);
729 0 : return NULL;
730 : }
731 :
732 13 : WPA_PUT_BE16(len, wpabuf_len(msg) - 2);
733 :
734 13 : return msg;
735 : }
736 :
737 :
738 12 : static int wps_build_ssid(struct wpabuf *msg, struct wps_context *wps)
739 : {
740 12 : wpa_printf(MSG_DEBUG, "WPS: * SSID");
741 24 : wpa_hexdump_ascii(MSG_DEBUG, "WPS: SSID in Connection Handover Select",
742 12 : wps->ssid, wps->ssid_len);
743 12 : wpabuf_put_be16(msg, ATTR_SSID);
744 12 : wpabuf_put_be16(msg, wps->ssid_len);
745 12 : wpabuf_put_data(msg, wps->ssid, wps->ssid_len);
746 12 : return 0;
747 : }
748 :
749 :
750 12 : static int wps_build_ap_freq(struct wpabuf *msg, int freq)
751 : {
752 : enum hostapd_hw_mode mode;
753 : u8 channel, rf_band;
754 : u16 ap_channel;
755 :
756 12 : if (freq <= 0)
757 3 : return 0;
758 :
759 9 : mode = ieee80211_freq_to_chan(freq, &channel);
760 9 : if (mode == NUM_HOSTAPD_MODES)
761 0 : return 0; /* Unknown channel */
762 :
763 9 : if (mode == HOSTAPD_MODE_IEEE80211G || mode == HOSTAPD_MODE_IEEE80211B)
764 8 : rf_band = WPS_RF_24GHZ;
765 1 : else if (mode == HOSTAPD_MODE_IEEE80211A)
766 1 : rf_band = WPS_RF_50GHZ;
767 0 : else if (mode == HOSTAPD_MODE_IEEE80211AD)
768 0 : rf_band = WPS_RF_60GHZ;
769 : else
770 0 : return 0; /* Unknown band */
771 9 : ap_channel = channel;
772 :
773 18 : if (wps_build_rf_bands_attr(msg, rf_band) ||
774 9 : wps_build_ap_channel(msg, ap_channel))
775 0 : return -1;
776 :
777 9 : return 0;
778 : }
779 :
780 :
781 13 : struct wpabuf * wps_build_nfc_handover_sel(struct wps_context *ctx,
782 : struct wpabuf *nfc_dh_pubkey,
783 : const u8 *bssid, int freq)
784 : {
785 : struct wpabuf *msg;
786 : void *len;
787 :
788 13 : if (ctx == NULL)
789 0 : return NULL;
790 :
791 13 : wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
792 : "handover select");
793 :
794 13 : if (nfc_dh_pubkey == NULL) {
795 0 : wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
796 : "configured");
797 0 : return NULL;
798 : }
799 :
800 13 : msg = wpabuf_alloc(1000);
801 13 : if (msg == NULL)
802 1 : return msg;
803 12 : len = wpabuf_put(msg, 2);
804 :
805 12 : if (wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
806 12 : nfc_dh_pubkey, NULL, 0) ||
807 24 : wps_build_ssid(msg, ctx) ||
808 24 : wps_build_ap_freq(msg, freq) ||
809 24 : (bssid && wps_build_mac_addr(msg, bssid)) ||
810 12 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
811 0 : wpabuf_free(msg);
812 0 : return NULL;
813 : }
814 :
815 12 : WPA_PUT_BE16(len, wpabuf_len(msg) - 2);
816 :
817 12 : return msg;
818 : }
819 :
820 :
821 14 : struct wpabuf * wps_build_nfc_handover_req_p2p(struct wps_context *ctx,
822 : struct wpabuf *nfc_dh_pubkey)
823 : {
824 : struct wpabuf *msg;
825 :
826 14 : if (ctx == NULL)
827 0 : return NULL;
828 :
829 14 : wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
830 : "handover request (P2P)");
831 :
832 14 : if (nfc_dh_pubkey == NULL) {
833 0 : wpa_printf(MSG_DEBUG, "WPS: No NFC DH Public Key configured");
834 0 : return NULL;
835 : }
836 :
837 14 : msg = wpabuf_alloc(1000);
838 14 : if (msg == NULL)
839 2 : return msg;
840 :
841 24 : if (wps_build_manufacturer(&ctx->dev, msg) ||
842 24 : wps_build_model_name(&ctx->dev, msg) ||
843 24 : wps_build_model_number(&ctx->dev, msg) ||
844 12 : wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
845 12 : nfc_dh_pubkey, NULL, 0) ||
846 24 : wps_build_rf_bands(&ctx->dev, msg, 0) ||
847 24 : wps_build_serial_number(&ctx->dev, msg) ||
848 24 : wps_build_uuid_e(msg, ctx->uuid) ||
849 12 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
850 0 : wpabuf_free(msg);
851 0 : return NULL;
852 : }
853 :
854 12 : return msg;
855 : }
856 :
857 :
858 29 : struct wpabuf * wps_build_nfc_handover_sel_p2p(struct wps_context *ctx,
859 : int nfc_dev_pw_id,
860 : struct wpabuf *nfc_dh_pubkey,
861 : struct wpabuf *nfc_dev_pw)
862 : {
863 : struct wpabuf *msg;
864 : const u8 *dev_pw;
865 : size_t dev_pw_len;
866 :
867 29 : if (ctx == NULL)
868 0 : return NULL;
869 :
870 29 : wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
871 : "handover select (P2P)");
872 :
873 29 : if (nfc_dh_pubkey == NULL ||
874 14 : (nfc_dev_pw_id != DEV_PW_NFC_CONNECTION_HANDOVER &&
875 : nfc_dev_pw == NULL)) {
876 2 : wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
877 : "configured");
878 2 : return NULL;
879 : }
880 :
881 27 : msg = wpabuf_alloc(1000);
882 27 : if (msg == NULL)
883 2 : return msg;
884 :
885 25 : if (nfc_dev_pw) {
886 11 : dev_pw = wpabuf_head(nfc_dev_pw);
887 11 : dev_pw_len = wpabuf_len(nfc_dev_pw);
888 : } else {
889 14 : dev_pw = NULL;
890 14 : dev_pw_len = 0;
891 : }
892 :
893 50 : if (wps_build_manufacturer(&ctx->dev, msg) ||
894 50 : wps_build_model_name(&ctx->dev, msg) ||
895 50 : wps_build_model_number(&ctx->dev, msg) ||
896 25 : wps_build_oob_dev_pw(msg, nfc_dev_pw_id, nfc_dh_pubkey,
897 25 : dev_pw, dev_pw_len) ||
898 50 : wps_build_rf_bands(&ctx->dev, msg, 0) ||
899 50 : wps_build_serial_number(&ctx->dev, msg) ||
900 50 : wps_build_uuid_e(msg, ctx->uuid) ||
901 25 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
902 0 : wpabuf_free(msg);
903 0 : return NULL;
904 : }
905 :
906 25 : return msg;
907 : }
908 :
909 : #endif /* CONFIG_WPS_NFC */
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