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