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 65 : 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 65 : WPA_PUT_BE32(key_bits, res_len * 8);
35 :
36 65 : addr[0] = i_buf;
37 65 : len[0] = sizeof(i_buf);
38 65 : addr[1] = label_prefix;
39 65 : len[1] = label_prefix_len;
40 65 : addr[2] = (const u8 *) label;
41 65 : len[2] = os_strlen(label);
42 65 : addr[3] = key_bits;
43 65 : len[3] = sizeof(key_bits);
44 :
45 65 : iter = (res_len + SHA256_MAC_LEN - 1) / SHA256_MAC_LEN;
46 65 : opos = res;
47 65 : left = res_len;
48 :
49 260 : for (i = 1; i <= iter; i++) {
50 195 : WPA_PUT_BE32(i_buf, i);
51 195 : hmac_sha256_vector(key, SHA256_MAC_LEN, 4, addr, len, hash);
52 195 : if (i < iter) {
53 130 : os_memcpy(opos, hash, SHA256_MAC_LEN);
54 130 : opos += SHA256_MAC_LEN;
55 130 : left -= SHA256_MAC_LEN;
56 : } else
57 65 : os_memcpy(opos, hash, left);
58 : }
59 65 : }
60 :
61 :
62 65 : 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 65 : 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 65 : pubkey = wps->registrar ? wps->dh_pubkey_e : wps->dh_pubkey_r;
76 65 : if (pubkey == NULL) {
77 0 : wpa_printf(MSG_DEBUG, "WPS: Peer DH public key not available");
78 0 : return -1;
79 : }
80 :
81 65 : wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH Private Key", wps->dh_privkey);
82 65 : wpa_hexdump_buf(MSG_DEBUG, "WPS: DH peer Public Key", pubkey);
83 65 : dh_shared = dh5_derive_shared(wps->dh_ctx, pubkey, wps->dh_privkey);
84 65 : dh5_free(wps->dh_ctx);
85 65 : wps->dh_ctx = NULL;
86 65 : dh_shared = wpabuf_zeropad(dh_shared, 192);
87 65 : if (dh_shared == NULL) {
88 0 : wpa_printf(MSG_DEBUG, "WPS: Failed to derive DH shared key");
89 0 : return -1;
90 : }
91 :
92 : /* Own DH private key is not needed anymore */
93 65 : wpabuf_free(wps->dh_privkey);
94 65 : wps->dh_privkey = NULL;
95 :
96 65 : wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH shared key", dh_shared);
97 :
98 : /* DHKey = SHA-256(g^AB mod p) */
99 65 : addr[0] = wpabuf_head(dh_shared);
100 65 : len[0] = wpabuf_len(dh_shared);
101 65 : sha256_vector(1, addr, len, dhkey);
102 65 : wpa_hexdump_key(MSG_DEBUG, "WPS: DHKey", dhkey, sizeof(dhkey));
103 65 : wpabuf_free(dh_shared);
104 :
105 : /* KDK = HMAC-SHA-256_DHKey(N1 || EnrolleeMAC || N2) */
106 65 : addr[0] = wps->nonce_e;
107 65 : len[0] = WPS_NONCE_LEN;
108 65 : addr[1] = wps->mac_addr_e;
109 65 : len[1] = ETH_ALEN;
110 65 : addr[2] = wps->nonce_r;
111 65 : len[2] = WPS_NONCE_LEN;
112 65 : hmac_sha256_vector(dhkey, sizeof(dhkey), 3, addr, len, kdk);
113 65 : wpa_hexdump_key(MSG_DEBUG, "WPS: KDK", kdk, sizeof(kdk));
114 :
115 65 : wps_kdf(kdk, NULL, 0, "Wi-Fi Easy and Secure Key Derivation",
116 : keys, sizeof(keys));
117 65 : os_memcpy(wps->authkey, keys, WPS_AUTHKEY_LEN);
118 65 : os_memcpy(wps->keywrapkey, keys + WPS_AUTHKEY_LEN, WPS_KEYWRAPKEY_LEN);
119 65 : os_memcpy(wps->emsk, keys + WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN,
120 : WPS_EMSK_LEN);
121 :
122 65 : wpa_hexdump_key(MSG_DEBUG, "WPS: AuthKey",
123 65 : wps->authkey, WPS_AUTHKEY_LEN);
124 65 : wpa_hexdump_key(MSG_DEBUG, "WPS: KeyWrapKey",
125 65 : wps->keywrapkey, WPS_KEYWRAPKEY_LEN);
126 65 : wpa_hexdump_key(MSG_DEBUG, "WPS: EMSK", wps->emsk, WPS_EMSK_LEN);
127 :
128 65 : return 0;
129 : }
130 :
131 :
132 59 : 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 59 : hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd,
138 59 : (dev_passwd_len + 1) / 2, hash);
139 59 : os_memcpy(wps->psk1, hash, WPS_PSK_LEN);
140 118 : hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN,
141 59 : dev_passwd + (dev_passwd_len + 1) / 2,
142 : dev_passwd_len / 2, hash);
143 59 : os_memcpy(wps->psk2, hash, WPS_PSK_LEN);
144 :
145 59 : wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Device Password",
146 : dev_passwd, dev_passwd_len);
147 59 : wpa_hexdump_key(MSG_DEBUG, "WPS: PSK1", wps->psk1, WPS_PSK_LEN);
148 59 : wpa_hexdump_key(MSG_DEBUG, "WPS: PSK2", wps->psk2, WPS_PSK_LEN);
149 59 : }
150 :
151 :
152 119 : struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr,
153 : size_t encr_len)
154 : {
155 : struct wpabuf *decrypted;
156 119 : const size_t block_size = 16;
157 : size_t i;
158 : u8 pad;
159 : const u8 *pos;
160 :
161 : /* AES-128-CBC */
162 119 : if (encr == NULL || encr_len < 2 * block_size || encr_len % block_size)
163 : {
164 0 : wpa_printf(MSG_DEBUG, "WPS: No Encrypted Settings received");
165 0 : return NULL;
166 : }
167 :
168 119 : decrypted = wpabuf_alloc(encr_len - block_size);
169 119 : if (decrypted == NULL)
170 0 : return NULL;
171 :
172 119 : wpa_hexdump(MSG_MSGDUMP, "WPS: Encrypted Settings", encr, encr_len);
173 119 : wpabuf_put_data(decrypted, encr + block_size, encr_len - block_size);
174 119 : 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 :
180 119 : wpa_hexdump_buf_key(MSG_MSGDUMP, "WPS: Decrypted Encrypted Settings",
181 : decrypted);
182 :
183 119 : pos = wpabuf_head_u8(decrypted) + wpabuf_len(decrypted) - 1;
184 119 : pad = *pos;
185 119 : if (pad > wpabuf_len(decrypted)) {
186 0 : wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad value");
187 0 : wpabuf_free(decrypted);
188 0 : return NULL;
189 : }
190 1959 : for (i = 0; i < pad; i++) {
191 1840 : if (*pos-- != pad) {
192 0 : wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad "
193 : "string");
194 0 : wpabuf_free(decrypted);
195 0 : return NULL;
196 : }
197 : }
198 119 : decrypted->used -= pad;
199 :
200 119 : 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 8 : unsigned int wps_pin_checksum(unsigned int pin)
210 : {
211 8 : unsigned int accum = 0;
212 48 : while (pin) {
213 32 : accum += 3 * (pin % 10);
214 32 : pin /= 10;
215 32 : accum += pin % 10;
216 32 : pin /= 10;
217 : }
218 :
219 8 : 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 5 : unsigned int wps_pin_valid(unsigned int pin)
229 : {
230 5 : 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 3 : unsigned int wps_generate_pin(void)
239 : {
240 : unsigned int val;
241 :
242 : /* Generate seven random digits for the PIN */
243 3 : if (random_get_bytes((unsigned char *) &val, sizeof(val)) < 0) {
244 : struct os_time now;
245 0 : os_get_time(&now);
246 0 : val = os_random() ^ now.sec ^ now.usec;
247 : }
248 3 : val %= 10000000;
249 :
250 : /* Append checksum digit */
251 3 : return val * 10 + wps_pin_checksum(val);
252 : }
253 :
254 :
255 0 : int wps_pin_str_valid(const char *pin)
256 : {
257 : const char *p;
258 : size_t len;
259 :
260 0 : p = pin;
261 0 : while (*p >= '0' && *p <= '9')
262 0 : p++;
263 0 : if (*p != '\0')
264 0 : return 0;
265 :
266 0 : len = p - pin;
267 0 : return len == 4 || len == 8;
268 : }
269 :
270 :
271 28 : 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 28 : if (wps->event_cb == NULL)
277 28 : return;
278 :
279 28 : os_memset(&data, 0, sizeof(data));
280 28 : data.fail.msg = msg;
281 28 : data.fail.config_error = config_error;
282 28 : data.fail.error_indication = error_indication;
283 28 : os_memcpy(data.fail.peer_macaddr, mac_addr, ETH_ALEN);
284 28 : wps->event_cb(wps->cb_ctx, WPS_EV_FAIL, &data);
285 : }
286 :
287 :
288 38 : void wps_success_event(struct wps_context *wps, const u8 *mac_addr)
289 : {
290 : union wps_event_data data;
291 :
292 38 : if (wps->event_cb == NULL)
293 38 : return;
294 :
295 38 : os_memset(&data, 0, sizeof(data));
296 38 : os_memcpy(data.success.peer_macaddr, mac_addr, ETH_ALEN);
297 38 : wps->event_cb(wps->cb_ctx, WPS_EV_SUCCESS, &data);
298 : }
299 :
300 :
301 6 : 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 6 : if (wps->event_cb == NULL)
307 6 : return;
308 :
309 6 : os_memset(&data, 0, sizeof(data));
310 6 : data.pwd_auth_fail.enrollee = enrollee;
311 6 : data.pwd_auth_fail.part = part;
312 6 : os_memcpy(data.pwd_auth_fail.peer_macaddr, mac_addr, ETH_ALEN);
313 6 : wps->event_cb(wps->cb_ctx, WPS_EV_PWD_AUTH_FAIL, &data);
314 : }
315 :
316 :
317 4 : void wps_pbc_overlap_event(struct wps_context *wps)
318 : {
319 4 : if (wps->event_cb == NULL)
320 4 : return;
321 :
322 4 : wps->event_cb(wps->cb_ctx, WPS_EV_PBC_OVERLAP, NULL);
323 : }
324 :
325 :
326 2 : void wps_pbc_timeout_event(struct wps_context *wps)
327 : {
328 2 : if (wps->event_cb == NULL)
329 2 : return;
330 :
331 2 : wps->event_cb(wps->cb_ctx, WPS_EV_PBC_TIMEOUT, NULL);
332 : }
333 :
334 :
335 24 : void wps_pbc_active_event(struct wps_context *wps)
336 : {
337 24 : if (wps->event_cb == NULL)
338 24 : return;
339 :
340 24 : wps->event_cb(wps->cb_ctx, WPS_EV_PBC_ACTIVE, NULL);
341 : }
342 :
343 :
344 17 : void wps_pbc_disable_event(struct wps_context *wps)
345 : {
346 17 : if (wps->event_cb == NULL)
347 17 : return;
348 :
349 17 : wps->event_cb(wps->cb_ctx, WPS_EV_PBC_DISABLE, NULL);
350 : }
351 :
352 :
353 : #ifdef CONFIG_WPS_OOB
354 :
355 2 : 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 2 : plain = wpabuf_alloc(500);
362 2 : if (plain == NULL) {
363 0 : wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
364 : "credential");
365 0 : return NULL;
366 : }
367 :
368 2 : os_memset(&data, 0, sizeof(data));
369 2 : data.wps = wps;
370 2 : data.auth_type = wps->auth_types;
371 2 : data.encr_type = wps->encr_types;
372 2 : if (wps_build_cred(&data, plain) ||
373 2 : (rf_band && wps_build_rf_bands_attr(plain, rf_band)) ||
374 4 : (channel && wps_build_ap_channel(plain, channel)) ||
375 4 : wps_build_mac_addr(plain, wps->dev.mac_addr) ||
376 2 : 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 3 : 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 2 : os_free(data.new_psk);
406 :
407 2 : return plain;
408 : }
409 :
410 :
411 3 : 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 3 : data = wpabuf_alloc(200);
418 3 : if (data == NULL)
419 0 : return NULL;
420 :
421 6 : if (wps_build_oob_dev_pw(data, dev_pw_id, pubkey,
422 6 : wpabuf_head(dev_pw), wpabuf_len(dev_pw)) ||
423 3 : 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 3 : return data;
431 : }
432 :
433 :
434 0 : 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 0 : for (i = 0; i < attr->num_cred; i++) {
440 : struct wps_credential local_cred;
441 : struct wps_parse_attr cattr;
442 :
443 0 : os_memset(&local_cred, 0, sizeof(local_cred));
444 0 : wpabuf_set(&msg, attr->cred[i], attr->cred_len[i]);
445 0 : if (wps_parse_msg(&msg, &cattr) < 0 ||
446 0 : wps_process_cred(&cattr, &local_cred)) {
447 0 : wpa_printf(MSG_ERROR, "WPS: Failed to parse OOB "
448 : "credential");
449 0 : return -1;
450 : }
451 0 : wps->cred_cb(wps->cb_ctx, &local_cred);
452 : }
453 :
454 0 : return 0;
455 : }
456 :
457 :
458 : #endif /* CONFIG_WPS_OOB */
459 :
460 :
461 16 : 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 16 : WPA_PUT_BE16(dev_type, atoi(str));
467 16 : pos = os_strchr(str, '-');
468 16 : if (pos == NULL)
469 1 : return -1;
470 15 : pos++;
471 15 : if (hexstr2bin(pos, &dev_type[2], 4))
472 0 : return -1;
473 15 : pos = os_strchr(pos, '-');
474 15 : if (pos == NULL)
475 0 : return -1;
476 15 : pos++;
477 15 : WPA_PUT_BE16(&dev_type[6], atoi(pos));
478 :
479 :
480 15 : return 0;
481 : }
482 :
483 :
484 292 : 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 :
489 584 : ret = os_snprintf(buf, buf_len, "%u-%08X-%u",
490 292 : WPA_GET_BE16(dev_type), WPA_GET_BE32(&dev_type[2]),
491 292 : WPA_GET_BE16(&dev_type[6]));
492 292 : if (ret < 0 || (unsigned int) ret >= buf_len)
493 0 : return NULL;
494 :
495 292 : return buf;
496 : }
497 :
498 :
499 51 : 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 51 : 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 51 : addr[0] = nsid;
513 51 : len[0] = sizeof(nsid);
514 51 : addr[1] = mac_addr;
515 51 : len[1] = 6;
516 51 : sha1_vector(2, addr, len, hash);
517 51 : os_memcpy(uuid, hash, 16);
518 :
519 : /* Version: 5 = named-based version using SHA-1 */
520 51 : uuid[6] = (5 << 4) | (uuid[6] & 0x0f);
521 :
522 : /* Variant specified in RFC 4122 */
523 51 : uuid[8] = 0x80 | (uuid[8] & 0x3f);
524 51 : }
525 :
526 :
527 68 : u16 wps_config_methods_str2bin(const char *str)
528 : {
529 68 : u16 methods = 0;
530 :
531 68 : if (str == NULL) {
532 : /* Default to enabling methods based on build configuration */
533 53 : methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
534 53 : methods |= WPS_CONFIG_VIRT_DISPLAY;
535 : #ifdef CONFIG_WPS_NFC
536 53 : methods |= WPS_CONFIG_NFC_INTERFACE;
537 : #endif /* CONFIG_WPS_NFC */
538 : } else {
539 15 : if (os_strstr(str, "ethernet"))
540 0 : methods |= WPS_CONFIG_ETHERNET;
541 15 : if (os_strstr(str, "label"))
542 15 : methods |= WPS_CONFIG_LABEL;
543 15 : if (os_strstr(str, "display"))
544 0 : methods |= WPS_CONFIG_DISPLAY;
545 15 : if (os_strstr(str, "ext_nfc_token"))
546 0 : methods |= WPS_CONFIG_EXT_NFC_TOKEN;
547 15 : if (os_strstr(str, "int_nfc_token"))
548 0 : methods |= WPS_CONFIG_INT_NFC_TOKEN;
549 15 : if (os_strstr(str, "nfc_interface"))
550 0 : methods |= WPS_CONFIG_NFC_INTERFACE;
551 15 : if (os_strstr(str, "push_button"))
552 15 : methods |= WPS_CONFIG_PUSHBUTTON;
553 15 : if (os_strstr(str, "keypad"))
554 0 : methods |= WPS_CONFIG_KEYPAD;
555 15 : if (os_strstr(str, "virtual_display"))
556 0 : methods |= WPS_CONFIG_VIRT_DISPLAY;
557 15 : if (os_strstr(str, "physical_display"))
558 0 : methods |= WPS_CONFIG_PHY_DISPLAY;
559 15 : if (os_strstr(str, "virtual_push_button"))
560 0 : methods |= WPS_CONFIG_VIRT_PUSHBUTTON;
561 15 : if (os_strstr(str, "physical_push_button"))
562 0 : methods |= WPS_CONFIG_PHY_PUSHBUTTON;
563 : }
564 :
565 68 : return methods;
566 : }
567 :
568 :
569 0 : struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
570 : {
571 : struct wpabuf *msg;
572 :
573 0 : wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
574 :
575 0 : msg = wpabuf_alloc(1000);
576 0 : if (msg == NULL)
577 0 : return NULL;
578 :
579 0 : if (wps_build_version(msg) ||
580 0 : wps_build_msg_type(msg, WPS_WSC_ACK) ||
581 0 : wps_build_enrollee_nonce(wps, msg) ||
582 0 : wps_build_registrar_nonce(wps, msg) ||
583 0 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
584 0 : wpabuf_free(msg);
585 0 : return NULL;
586 : }
587 :
588 0 : return msg;
589 : }
590 :
591 :
592 13 : struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
593 : {
594 : struct wpabuf *msg;
595 :
596 13 : wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
597 :
598 13 : msg = wpabuf_alloc(1000);
599 13 : if (msg == NULL)
600 0 : return NULL;
601 :
602 26 : if (wps_build_version(msg) ||
603 26 : wps_build_msg_type(msg, WPS_WSC_NACK) ||
604 26 : wps_build_enrollee_nonce(wps, msg) ||
605 26 : wps_build_registrar_nonce(wps, msg) ||
606 26 : wps_build_config_error(msg, wps->config_error) ||
607 13 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
608 0 : wpabuf_free(msg);
609 0 : return NULL;
610 : }
611 :
612 13 : return msg;
613 : }
614 :
615 :
616 : #ifdef CONFIG_WPS_NFC
617 :
618 3 : struct wpabuf * wps_nfc_token_build(int ndef, int id, struct wpabuf *pubkey,
619 : struct wpabuf *dev_pw)
620 : {
621 : struct wpabuf *ret;
622 :
623 3 : if (pubkey == NULL || dev_pw == NULL)
624 0 : return NULL;
625 :
626 3 : ret = wps_build_nfc_pw_token(id, pubkey, dev_pw);
627 3 : if (ndef && ret) {
628 : struct wpabuf *tmp;
629 2 : tmp = ndef_build_wifi(ret);
630 2 : wpabuf_free(ret);
631 2 : if (tmp == NULL)
632 0 : return NULL;
633 2 : ret = tmp;
634 : }
635 :
636 3 : return ret;
637 : }
638 :
639 :
640 10 : int wps_nfc_gen_dh(struct wpabuf **pubkey, struct wpabuf **privkey)
641 : {
642 10 : struct wpabuf *priv = NULL, *pub = NULL;
643 : void *dh_ctx;
644 :
645 10 : dh_ctx = dh5_init(&priv, &pub);
646 10 : if (dh_ctx == NULL)
647 0 : return -1;
648 10 : pub = wpabuf_zeropad(pub, 192);
649 10 : if (pub == NULL) {
650 0 : wpabuf_free(priv);
651 0 : return -1;
652 : }
653 10 : wpa_hexdump_buf(MSG_DEBUG, "WPS: Generated new DH pubkey", pub);
654 10 : dh5_free(dh_ctx);
655 :
656 10 : wpabuf_free(*pubkey);
657 10 : *pubkey = pub;
658 10 : wpabuf_free(*privkey);
659 10 : *privkey = priv;
660 :
661 10 : return 0;
662 : }
663 :
664 :
665 3 : struct wpabuf * wps_nfc_token_gen(int ndef, int *id, struct wpabuf **pubkey,
666 : struct wpabuf **privkey,
667 : struct wpabuf **dev_pw)
668 : {
669 : struct wpabuf *pw;
670 : u16 val;
671 :
672 3 : pw = wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN);
673 3 : if (pw == NULL)
674 0 : return NULL;
675 :
676 3 : if (random_get_bytes(wpabuf_put(pw, WPS_OOB_DEVICE_PASSWORD_LEN),
677 3 : WPS_OOB_DEVICE_PASSWORD_LEN) ||
678 3 : random_get_bytes((u8 *) &val, sizeof(val))) {
679 0 : wpabuf_free(pw);
680 0 : return NULL;
681 : }
682 :
683 3 : if (wps_nfc_gen_dh(pubkey, privkey) < 0) {
684 0 : wpabuf_free(pw);
685 0 : return NULL;
686 : }
687 :
688 3 : *id = 0x10 + val % 0xfff0;
689 3 : wpabuf_free(*dev_pw);
690 3 : *dev_pw = pw;
691 :
692 3 : return wps_nfc_token_build(ndef, *id, *pubkey, *dev_pw);
693 : }
694 :
695 :
696 0 : struct wpabuf * wps_build_nfc_handover_req(struct wps_context *ctx,
697 : struct wpabuf *nfc_dh_pubkey)
698 : {
699 : struct wpabuf *msg;
700 : void *len;
701 :
702 0 : if (ctx == NULL)
703 0 : return NULL;
704 :
705 0 : wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
706 : "handover request");
707 :
708 0 : if (nfc_dh_pubkey == NULL) {
709 0 : wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
710 : "configured");
711 0 : return NULL;
712 : }
713 :
714 0 : msg = wpabuf_alloc(1000);
715 0 : if (msg == NULL)
716 0 : return msg;
717 0 : len = wpabuf_put(msg, 2);
718 :
719 0 : if (wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
720 0 : nfc_dh_pubkey, NULL, 0) ||
721 0 : wps_build_uuid_e(msg, ctx->uuid) ||
722 0 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
723 0 : wpabuf_free(msg);
724 0 : return NULL;
725 : }
726 :
727 0 : WPA_PUT_BE16(len, wpabuf_len(msg) - 2);
728 :
729 0 : return msg;
730 : }
731 :
732 :
733 8 : static int wps_build_ssid(struct wpabuf *msg, struct wps_context *wps)
734 : {
735 8 : wpa_printf(MSG_DEBUG, "WPS: * SSID");
736 16 : wpa_hexdump_ascii(MSG_DEBUG, "WPS: SSID in Connection Handover Select",
737 8 : wps->ssid, wps->ssid_len);
738 8 : wpabuf_put_be16(msg, ATTR_SSID);
739 8 : wpabuf_put_be16(msg, wps->ssid_len);
740 8 : wpabuf_put_data(msg, wps->ssid, wps->ssid_len);
741 8 : return 0;
742 : }
743 :
744 :
745 8 : static int wps_build_ap_freq(struct wpabuf *msg, int freq)
746 : {
747 : enum hostapd_hw_mode mode;
748 : u8 channel, rf_band;
749 : u16 ap_channel;
750 :
751 8 : if (freq <= 0)
752 0 : return 0;
753 :
754 8 : mode = ieee80211_freq_to_chan(freq, &channel);
755 8 : if (mode == NUM_HOSTAPD_MODES)
756 0 : return 0; /* Unknown channel */
757 :
758 8 : if (mode == HOSTAPD_MODE_IEEE80211G || mode == HOSTAPD_MODE_IEEE80211B)
759 7 : rf_band = WPS_RF_24GHZ;
760 1 : else if (mode == HOSTAPD_MODE_IEEE80211A)
761 1 : rf_band = WPS_RF_50GHZ;
762 : else
763 0 : return 0; /* Unknown band */
764 8 : ap_channel = channel;
765 :
766 16 : if (wps_build_rf_bands_attr(msg, rf_band) ||
767 8 : wps_build_ap_channel(msg, ap_channel))
768 0 : return -1;
769 :
770 8 : return 0;
771 : }
772 :
773 :
774 8 : struct wpabuf * wps_build_nfc_handover_sel(struct wps_context *ctx,
775 : struct wpabuf *nfc_dh_pubkey,
776 : const u8 *bssid, int freq)
777 : {
778 : struct wpabuf *msg;
779 : void *len;
780 :
781 8 : if (ctx == NULL)
782 0 : return NULL;
783 :
784 8 : wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
785 : "handover select");
786 :
787 8 : if (nfc_dh_pubkey == NULL) {
788 0 : wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
789 : "configured");
790 0 : return NULL;
791 : }
792 :
793 8 : msg = wpabuf_alloc(1000);
794 8 : if (msg == NULL)
795 0 : return msg;
796 8 : len = wpabuf_put(msg, 2);
797 :
798 8 : if (wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
799 8 : nfc_dh_pubkey, NULL, 0) ||
800 16 : wps_build_ssid(msg, ctx) ||
801 16 : wps_build_ap_freq(msg, freq) ||
802 16 : (bssid && wps_build_mac_addr(msg, bssid)) ||
803 8 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
804 0 : wpabuf_free(msg);
805 0 : return NULL;
806 : }
807 :
808 8 : WPA_PUT_BE16(len, wpabuf_len(msg) - 2);
809 :
810 8 : return msg;
811 : }
812 :
813 :
814 0 : struct wpabuf * wps_build_nfc_handover_req_p2p(struct wps_context *ctx,
815 : struct wpabuf *nfc_dh_pubkey)
816 : {
817 : struct wpabuf *msg;
818 :
819 0 : if (ctx == NULL)
820 0 : return NULL;
821 :
822 0 : wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
823 : "handover request (P2P)");
824 :
825 0 : if (nfc_dh_pubkey == NULL) {
826 0 : wpa_printf(MSG_DEBUG, "WPS: No NFC DH Public Key configured");
827 0 : return NULL;
828 : }
829 :
830 0 : msg = wpabuf_alloc(1000);
831 0 : if (msg == NULL)
832 0 : return msg;
833 :
834 0 : if (wps_build_manufacturer(&ctx->dev, msg) ||
835 0 : wps_build_model_name(&ctx->dev, msg) ||
836 0 : wps_build_model_number(&ctx->dev, msg) ||
837 0 : wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
838 0 : nfc_dh_pubkey, NULL, 0) ||
839 0 : wps_build_rf_bands(&ctx->dev, msg, 0) ||
840 0 : wps_build_serial_number(&ctx->dev, msg) ||
841 0 : wps_build_uuid_e(msg, ctx->uuid) ||
842 0 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
843 0 : wpabuf_free(msg);
844 0 : return NULL;
845 : }
846 :
847 0 : return msg;
848 : }
849 :
850 :
851 0 : struct wpabuf * wps_build_nfc_handover_sel_p2p(struct wps_context *ctx,
852 : int nfc_dev_pw_id,
853 : struct wpabuf *nfc_dh_pubkey,
854 : struct wpabuf *nfc_dev_pw)
855 : {
856 : struct wpabuf *msg;
857 : const u8 *dev_pw;
858 : size_t dev_pw_len;
859 :
860 0 : if (ctx == NULL)
861 0 : return NULL;
862 :
863 0 : wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
864 : "handover select (P2P)");
865 :
866 0 : if (nfc_dh_pubkey == NULL ||
867 0 : (nfc_dev_pw_id != DEV_PW_NFC_CONNECTION_HANDOVER &&
868 : nfc_dev_pw == NULL)) {
869 0 : wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
870 : "configured");
871 0 : return NULL;
872 : }
873 :
874 0 : msg = wpabuf_alloc(1000);
875 0 : if (msg == NULL)
876 0 : return msg;
877 :
878 0 : if (nfc_dev_pw) {
879 0 : dev_pw = wpabuf_head(nfc_dev_pw);
880 0 : dev_pw_len = wpabuf_len(nfc_dev_pw);
881 : } else {
882 0 : dev_pw = NULL;
883 0 : dev_pw_len = 0;
884 : }
885 :
886 0 : if (wps_build_manufacturer(&ctx->dev, msg) ||
887 0 : wps_build_model_name(&ctx->dev, msg) ||
888 0 : wps_build_model_number(&ctx->dev, msg) ||
889 0 : wps_build_oob_dev_pw(msg, nfc_dev_pw_id, nfc_dh_pubkey,
890 0 : dev_pw, dev_pw_len) ||
891 0 : wps_build_rf_bands(&ctx->dev, msg, 0) ||
892 0 : wps_build_serial_number(&ctx->dev, msg) ||
893 0 : wps_build_uuid_e(msg, ctx->uuid) ||
894 0 : wps_build_wfa_ext(msg, 0, NULL, 0)) {
895 0 : wpabuf_free(msg);
896 0 : return NULL;
897 : }
898 :
899 0 : return msg;
900 : }
901 :
902 : #endif /* CONFIG_WPS_NFC */
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