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 /*
94 * due to the public key calculated when wps start, it will not calculate anymore even when we build M1 message, also calculate the key need take a long time
95 * which would cause WPS fail, so we clean the key after WPS finished .
96 */
97 #ifndef ESP_SUPPLICANT
98 wpabuf_clear_free(wps->dh_privkey);
99 wps->dh_privkey = NULL;
100 #endif /* ESP_SUPPLICANT */
101
102 wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH shared key", dh_shared);
103
104 /* DHKey = SHA-256(g^AB mod p) */
105 addr[0] = wpabuf_head(dh_shared);
106 len[0] = wpabuf_len(dh_shared);
107 sha256_vector(1, addr, len, dhkey);
108 wpa_hexdump_key(MSG_DEBUG, "WPS: DHKey", dhkey, sizeof(dhkey));
109 wpabuf_clear_free(dh_shared);
110
111 /* KDK = HMAC-SHA-256_DHKey(N1 || EnrolleeMAC || N2) */
112 addr[0] = wps->nonce_e;
113 len[0] = WPS_NONCE_LEN;
114 addr[1] = wps->mac_addr_e;
115 len[1] = ETH_ALEN;
116 addr[2] = wps->nonce_r;
117 len[2] = WPS_NONCE_LEN;
118 hmac_sha256_vector(dhkey, sizeof(dhkey), 3, addr, len, kdk);
119 wpa_hexdump_key(MSG_DEBUG, "WPS: KDK", kdk, sizeof(kdk));
120
121 wps_kdf(kdk, NULL, 0, "Wi-Fi Easy and Secure Key Derivation",
122 keys, sizeof(keys));
123 os_memcpy(wps->authkey, keys, WPS_AUTHKEY_LEN);
124 os_memcpy(wps->keywrapkey, keys + WPS_AUTHKEY_LEN, WPS_KEYWRAPKEY_LEN);
125 os_memcpy(wps->emsk, keys + WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN,
126 WPS_EMSK_LEN);
127
128 wpa_hexdump_key(MSG_DEBUG, "WPS: AuthKey",
129 wps->authkey, WPS_AUTHKEY_LEN);
130 wpa_hexdump_key(MSG_DEBUG, "WPS: KeyWrapKey",
131 wps->keywrapkey, WPS_KEYWRAPKEY_LEN);
132 wpa_hexdump_key(MSG_DEBUG, "WPS: EMSK", wps->emsk, WPS_EMSK_LEN);
133
134 return 0;
135 }
136
137
wps_derive_psk(struct wps_data * wps,const u8 * dev_passwd,size_t dev_passwd_len)138 int wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
139 size_t dev_passwd_len)
140 {
141 u8 hash[SHA256_MAC_LEN];
142
143 if (hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd,
144 (dev_passwd_len + 1) / 2, hash) < 0)
145 return -1;
146 os_memcpy(wps->psk1, hash, WPS_PSK_LEN);
147 if (hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN,
148 dev_passwd + (dev_passwd_len + 1) / 2,
149 dev_passwd_len / 2, hash) < 0)
150 return -1;
151 os_memcpy(wps->psk2, hash, WPS_PSK_LEN);
152
153 wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Device Password",
154 dev_passwd, dev_passwd_len);
155 wpa_hexdump_key(MSG_DEBUG, "WPS: PSK1", wps->psk1, WPS_PSK_LEN);
156 wpa_hexdump_key(MSG_DEBUG, "WPS: PSK2", wps->psk2, WPS_PSK_LEN);
157 return 0;
158 }
159
160
wps_decrypt_encr_settings(struct wps_data * wps,const u8 * encr,size_t encr_len)161 struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr,
162 size_t encr_len)
163 {
164 struct wpabuf *decrypted;
165 const size_t block_size = 16;
166 size_t i;
167 u8 pad;
168 const u8 *pos;
169
170 /* AES-128-CBC */
171 if (encr == NULL || encr_len < 2 * block_size || encr_len % block_size)
172 {
173 wpa_printf(MSG_DEBUG, "WPS: No Encrypted Settings received");
174 return NULL;
175 }
176
177 decrypted = wpabuf_alloc(encr_len - block_size);
178 if (decrypted == NULL)
179 return NULL;
180
181 wpa_hexdump(MSG_MSGDUMP, "WPS: Encrypted Settings", encr, encr_len);
182 wpabuf_put_data(decrypted, encr + block_size, encr_len - block_size);
183 if (aes_128_cbc_decrypt(wps->keywrapkey, encr, wpabuf_mhead(decrypted),
184 wpabuf_len(decrypted))) {
185 wpabuf_clear_free(decrypted);
186 return NULL;
187 }
188
189 wpa_hexdump_buf_key(MSG_MSGDUMP, "WPS: Decrypted Encrypted Settings",
190 decrypted);
191
192 pos = wpabuf_head_u8(decrypted) + wpabuf_len(decrypted) - 1;
193 pad = *pos;
194 if (pad > wpabuf_len(decrypted)) {
195 wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad value");
196 wpabuf_clear_free(decrypted);
197 return NULL;
198 }
199 for (i = 0; i < pad; i++) {
200 if (*pos-- != pad) {
201 wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad "
202 "string");
203 wpabuf_clear_free(decrypted);
204 return NULL;
205 }
206 }
207 decrypted->used -= pad;
208
209 return decrypted;
210 }
211
212
213 /**
214 * wps_pin_checksum - Compute PIN checksum
215 * @pin: Seven digit PIN (i.e., eight digit PIN without the checksum digit)
216 * Returns: Checksum digit
217 */
wps_pin_checksum(unsigned int pin)218 unsigned int wps_pin_checksum(unsigned int pin)
219 {
220 unsigned int accum = 0;
221 while (pin) {
222 accum += 3 * (pin % 10);
223 pin /= 10;
224 accum += pin % 10;
225 pin /= 10;
226 }
227
228 return (10 - accum % 10) % 10;
229 }
230
231
232 /**
233 * wps_pin_valid - Check whether a PIN has a valid checksum
234 * @pin: Eight digit PIN (i.e., including the checksum digit)
235 * Returns: 1 if checksum digit is valid, or 0 if not
236 */
wps_pin_valid(unsigned int pin)237 unsigned int wps_pin_valid(unsigned int pin)
238 {
239 return wps_pin_checksum(pin / 10) == (pin % 10);
240 }
241
242
243 /**
244 * wps_generate_pin - Generate a random PIN
245 * Returns: Eight digit PIN (i.e., including the checksum digit)
246 */
wps_generate_pin(unsigned int * pin)247 int wps_generate_pin(unsigned int *pin)
248 {
249 unsigned int val;
250
251 /* Generate seven random digits for the PIN */
252 if (random_get_bytes((unsigned char *) &val, sizeof(val)) < 0)
253 return -1;
254 val %= 10000000;
255
256 /* Append checksum digit */
257 *pin = val * 10 + wps_pin_checksum(val);
258 return 0;
259 }
260
261
wps_pin_str_valid(const char * pin)262 int wps_pin_str_valid(const char *pin)
263 {
264 const char *p;
265 size_t len;
266
267 p = pin;
268 while (*p >= '0' && *p <= '9')
269 p++;
270 if (*p != '\0')
271 return 0;
272
273 len = p - pin;
274 return len == 4 || len == 8;
275 }
276
277
wps_fail_event(struct wps_context * wps,enum wps_msg_type msg,u16 config_error,u16 error_indication,const u8 * mac_addr)278 void wps_fail_event(struct wps_context *wps, enum wps_msg_type msg,
279 u16 config_error, u16 error_indication, const u8 *mac_addr)
280 {
281 union wps_event_data data;
282
283 if (wps->event_cb == NULL)
284 return;
285
286 os_memset(&data, 0, sizeof(data));
287 data.fail.msg = msg;
288 data.fail.config_error = config_error;
289 data.fail.error_indication = error_indication;
290 os_memcpy(data.fail.peer_macaddr, mac_addr, ETH_ALEN);
291 wps->event_cb(wps->cb_ctx, WPS_EV_FAIL, &data);
292 }
293
294
wps_success_event(struct wps_context * wps,const u8 * mac_addr)295 void wps_success_event(struct wps_context *wps, const u8 *mac_addr)
296 {
297 union wps_event_data data;
298
299 if (wps->event_cb == NULL)
300 return;
301
302 os_memset(&data, 0, sizeof(data));
303 os_memcpy(data.success.peer_macaddr, mac_addr, ETH_ALEN);
304 wps->event_cb(wps->cb_ctx, WPS_EV_SUCCESS, &data);
305 }
306
307
wps_pwd_auth_fail_event(struct wps_context * wps,int enrollee,int part,const u8 * mac_addr)308 void wps_pwd_auth_fail_event(struct wps_context *wps, int enrollee, int part,
309 const u8 *mac_addr)
310 {
311 union wps_event_data data;
312
313 if (wps->event_cb == NULL)
314 return;
315
316 os_memset(&data, 0, sizeof(data));
317 data.pwd_auth_fail.enrollee = enrollee;
318 data.pwd_auth_fail.part = part;
319 os_memcpy(data.pwd_auth_fail.peer_macaddr, mac_addr, ETH_ALEN);
320 wps->event_cb(wps->cb_ctx, WPS_EV_PWD_AUTH_FAIL, &data);
321 }
322
323
wps_pbc_overlap_event(struct wps_context * wps)324 void wps_pbc_overlap_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_OVERLAP, NULL);
330 }
331
332
wps_selected_registrar_timeout_event(struct wps_context * wps)333 void wps_selected_registrar_timeout_event(struct wps_context *wps)
334 {
335 if (wps->event_cb == NULL)
336 return;
337
338 wps->event_cb(wps->cb_ctx, WPS_EV_SELECTED_REGISTRAR_TIMEOUT, NULL);
339 }
340
wps_pbc_timeout_event(struct wps_context * wps)341 void wps_pbc_timeout_event(struct wps_context *wps)
342 {
343 if (wps->event_cb == NULL)
344 return;
345
346 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_TIMEOUT, NULL);
347 }
348
349
wps_pbc_active_event(struct wps_context * wps)350 void wps_pbc_active_event(struct wps_context *wps)
351 {
352 if (wps->event_cb == NULL)
353 return;
354
355 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_ACTIVE, NULL);
356 }
357
358
wps_pbc_disable_event(struct wps_context * wps)359 void wps_pbc_disable_event(struct wps_context *wps)
360 {
361 if (wps->event_cb == NULL)
362 return;
363
364 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_DISABLE, NULL);
365 }
366
367
368 #ifdef CONFIG_WPS_OOB
369
wps_get_oob_cred(struct wps_context * wps,int rf_band,int channel)370 struct wpabuf * wps_get_oob_cred(struct wps_context *wps, int rf_band,
371 int channel)
372 {
373 struct wps_data data;
374 struct wpabuf *plain;
375
376 plain = wpabuf_alloc(500);
377 if (plain == NULL) {
378 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
379 "credential");
380 return NULL;
381 }
382
383 os_memset(&data, 0, sizeof(data));
384 data.wps = wps;
385 data.auth_type = wps->auth_types;
386 data.encr_type = wps->encr_types;
387 if (wps_build_cred(&data, plain) ||
388 (rf_band && wps_build_rf_bands_attr(plain, rf_band)) ||
389 (channel && wps_build_ap_channel(plain, channel)) ||
390 wps_build_mac_addr(plain, wps->dev.mac_addr) ||
391 wps_build_wfa_ext(plain, 0, NULL, 0, 0)) {
392 os_free(data.new_psk);
393 wpabuf_clear_free(plain);
394 return NULL;
395 }
396
397 if (wps->wps_state == WPS_STATE_NOT_CONFIGURED && data.new_psk &&
398 wps->ap) {
399 struct wps_credential cred;
400
401 wpa_printf(MSG_DEBUG, "WPS: Moving to Configured state based "
402 "on credential token generation");
403
404 os_memset(&cred, 0, sizeof(cred));
405 os_memcpy(cred.ssid, wps->ssid, wps->ssid_len);
406 cred.ssid_len = wps->ssid_len;
407 cred.auth_type = WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK;
408 cred.encr_type = WPS_ENCR_TKIP | WPS_ENCR_AES;
409 os_memcpy(cred.key, data.new_psk, data.new_psk_len);
410 cred.key_len = data.new_psk_len;
411
412 wps->wps_state = WPS_STATE_CONFIGURED;
413 wpa_hexdump_ascii_key(MSG_DEBUG,
414 "WPS: Generated random passphrase",
415 data.new_psk, data.new_psk_len);
416 if (wps->cred_cb)
417 wps->cred_cb(wps->cb_ctx, &cred);
418 }
419
420 os_free(data.new_psk);
421
422 return plain;
423 }
424
425 #ifdef CONFIG_WPS_NFC
426
wps_build_nfc_pw_token(u16 dev_pw_id,const struct wpabuf * pubkey,const struct wpabuf * dev_pw)427 struct wpabuf * wps_build_nfc_pw_token(u16 dev_pw_id,
428 const struct wpabuf *pubkey,
429 const struct wpabuf *dev_pw)
430 {
431 struct wpabuf *data;
432
433 data = wpabuf_alloc(200);
434 if (data == NULL)
435 return NULL;
436
437 if (wps_build_oob_dev_pw(data, dev_pw_id, pubkey,
438 wpabuf_head(dev_pw), wpabuf_len(dev_pw)) ||
439 wps_build_wfa_ext(data, 0, NULL, 0, 0)) {
440 wpa_printf(MSG_ERROR, "WPS: Failed to build NFC password "
441 "token");
442 wpabuf_clear_free(data);
443 return NULL;
444 }
445
446 return data;
447 }
448
449 #endif
450
wps_oob_use_cred(struct wps_context * wps,struct wps_parse_attr * attr)451 int wps_oob_use_cred(struct wps_context *wps, struct wps_parse_attr *attr)
452 {
453 struct wpabuf msg;
454 size_t i;
455
456 for (i = 0; i < attr->num_cred; i++) {
457 struct wps_credential local_cred;
458 struct wps_parse_attr cattr;
459
460 os_memset(&local_cred, 0, sizeof(local_cred));
461 wpabuf_set(&msg, attr->cred[i], attr->cred_len[i]);
462 if (wps_parse_msg(&msg, &cattr) < 0 ||
463 wps_process_cred(&cattr, &local_cred)) {
464 wpa_printf(MSG_ERROR, "WPS: Failed to parse OOB "
465 "credential");
466 return -1;
467 }
468 wps->cred_cb(wps->cb_ctx, &local_cred);
469 }
470
471 return 0;
472 }
473
474
475 #endif /* CONFIG_WPS_OOB */
476
477
wps_dev_type_str2bin(const char * str,u8 dev_type[WPS_DEV_TYPE_LEN])478 int wps_dev_type_str2bin(const char *str, u8 dev_type[WPS_DEV_TYPE_LEN])
479 {
480 const char *pos;
481
482 /* <categ>-<OUI>-<subcateg> */
483 WPA_PUT_BE16(dev_type, atoi(str));
484 pos = os_strchr(str, '-');
485 if (pos == NULL)
486 return -1;
487 pos++;
488 if (hexstr2bin(pos, &dev_type[2], 4))
489 return -1;
490 pos = os_strchr(pos, '-');
491 if (pos == NULL)
492 return -1;
493 pos++;
494 WPA_PUT_BE16(&dev_type[6], atoi(pos));
495
496
497 return 0;
498 }
499
500
wps_dev_type_bin2str(const u8 dev_type[WPS_DEV_TYPE_LEN],char * buf,size_t buf_len)501 char * wps_dev_type_bin2str(const u8 dev_type[WPS_DEV_TYPE_LEN], char *buf,
502 size_t buf_len)
503 {
504 int ret;
505
506 ret = os_snprintf(buf, buf_len, "%u-%08X-%u",
507 WPA_GET_BE16(dev_type), WPA_GET_BE32(&dev_type[2]),
508 WPA_GET_BE16(&dev_type[6]));
509 if (os_snprintf_error(buf_len, ret))
510 return NULL;
511
512 return buf;
513 }
514
515
uuid_gen_mac_addr(const u8 * mac_addr,u8 * uuid)516 void uuid_gen_mac_addr(const u8 *mac_addr, u8 *uuid)
517 {
518 const u8 *addr[2];
519 size_t len[2];
520 u8 hash[SHA1_MAC_LEN];
521 u8 nsid[16] = {
522 0x52, 0x64, 0x80, 0xf8,
523 0xc9, 0x9b,
524 0x4b, 0xe5,
525 0xa6, 0x55,
526 0x58, 0xed, 0x5f, 0x5d, 0x60, 0x84
527 };
528
529 addr[0] = nsid;
530 len[0] = sizeof(nsid);
531 addr[1] = mac_addr;
532 len[1] = 6;
533 sha1_vector(2, addr, len, hash);
534 os_memcpy(uuid, hash, 16);
535
536 /* Version: 5 = named-based version using SHA-1 */
537 uuid[6] = (5 << 4) | (uuid[6] & 0x0f);
538
539 /* Variant specified in RFC 4122 */
540 uuid[8] = 0x80 | (uuid[8] & 0x3f);
541 }
542
543
wps_config_methods_str2bin(const char * str)544 u16 wps_config_methods_str2bin(const char *str)
545 {
546 u16 methods = 0;
547
548 if (str == NULL || str[0] == '\0') {
549 /* Default to enabling methods based on build configuration */
550 methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
551 methods |= WPS_CONFIG_VIRT_DISPLAY;
552 #ifdef CONFIG_WPS_NFC
553 methods |= WPS_CONFIG_NFC_INTERFACE;
554 #endif /* CONFIG_WPS_NFC */
555 #ifdef CONFIG_P2P
556 methods |= WPS_CONFIG_P2PS;
557 #endif /* CONFIG_P2P */
558 } else {
559 if (os_strstr(str, "ethernet"))
560 methods |= WPS_CONFIG_ETHERNET;
561 if (os_strstr(str, "label"))
562 methods |= WPS_CONFIG_LABEL;
563 if (os_strstr(str, "display"))
564 methods |= WPS_CONFIG_DISPLAY;
565 if (os_strstr(str, "ext_nfc_token"))
566 methods |= WPS_CONFIG_EXT_NFC_TOKEN;
567 if (os_strstr(str, "int_nfc_token"))
568 methods |= WPS_CONFIG_INT_NFC_TOKEN;
569 if (os_strstr(str, "nfc_interface"))
570 methods |= WPS_CONFIG_NFC_INTERFACE;
571 if (os_strstr(str, "push_button"))
572 methods |= WPS_CONFIG_PUSHBUTTON;
573 if (os_strstr(str, "keypad"))
574 methods |= WPS_CONFIG_KEYPAD;
575 if (os_strstr(str, "virtual_display"))
576 methods |= WPS_CONFIG_VIRT_DISPLAY;
577 if (os_strstr(str, "physical_display"))
578 methods |= WPS_CONFIG_PHY_DISPLAY;
579 if (os_strstr(str, "virtual_push_button"))
580 methods |= WPS_CONFIG_VIRT_PUSHBUTTON;
581 if (os_strstr(str, "physical_push_button"))
582 methods |= WPS_CONFIG_PHY_PUSHBUTTON;
583 if (os_strstr(str, "p2ps"))
584 methods |= WPS_CONFIG_P2PS;
585 }
586
587 return methods;
588 }
589
590
wps_build_wsc_ack(struct wps_data * wps)591 struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
592 {
593 struct wpabuf *msg;
594
595 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
596
597 msg = wpabuf_alloc(1000);
598 if (msg == NULL)
599 return NULL;
600
601 if (wps_build_version(msg) ||
602 wps_build_msg_type(msg, WPS_WSC_ACK) ||
603 wps_build_enrollee_nonce(wps, msg) ||
604 wps_build_registrar_nonce(wps, msg) ||
605 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) {
606 wpabuf_free(msg);
607 return NULL;
608 }
609
610 return msg;
611 }
612
613
wps_build_wsc_nack(struct wps_data * wps)614 struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
615 {
616 struct wpabuf *msg;
617
618 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
619
620 msg = wpabuf_alloc(1000);
621 if (msg == NULL)
622 return NULL;
623
624 if (wps_build_version(msg) ||
625 wps_build_msg_type(msg, WPS_WSC_NACK) ||
626 wps_build_enrollee_nonce(wps, msg) ||
627 wps_build_registrar_nonce(wps, msg) ||
628 wps_build_config_error(msg, wps->config_error) ||
629 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) {
630 wpabuf_free(msg);
631 return NULL;
632 }
633
634 return msg;
635 }
636
637
638 #ifdef CONFIG_WPS_NFC
639
wps_nfc_token_build(int ndef,int id,struct wpabuf * pubkey,struct wpabuf * dev_pw)640 struct wpabuf * wps_nfc_token_build(int ndef, int id, struct wpabuf *pubkey,
641 struct wpabuf *dev_pw)
642 {
643 struct wpabuf *ret;
644
645 if (pubkey == NULL || dev_pw == NULL)
646 return NULL;
647
648 ret = wps_build_nfc_pw_token(id, pubkey, dev_pw);
649 if (ndef && ret) {
650 struct wpabuf *tmp;
651 tmp = ndef_build_wifi(ret);
652 wpabuf_free(ret);
653 if (tmp == NULL)
654 return NULL;
655 ret = tmp;
656 }
657
658 return ret;
659 }
660
661
wps_nfc_gen_dh(struct wpabuf ** pubkey,struct wpabuf ** privkey)662 int wps_nfc_gen_dh(struct wpabuf **pubkey, struct wpabuf **privkey)
663 {
664 struct wpabuf *priv = NULL, *pub = NULL;
665 void *dh_ctx;
666
667 dh_ctx = dh5_init(&priv, &pub);
668 if (dh_ctx == NULL)
669 return -1;
670 pub = wpabuf_zeropad(pub, 192);
671 if (pub == NULL) {
672 wpabuf_free(priv);
673 dh5_free(dh_ctx);
674 return -1;
675 }
676 wpa_hexdump_buf(MSG_DEBUG, "WPS: Generated new DH pubkey", pub);
677 dh5_free(dh_ctx);
678
679 wpabuf_free(*pubkey);
680 *pubkey = pub;
681 wpabuf_clear_free(*privkey);
682 *privkey = priv;
683
684 return 0;
685 }
686
687
wps_nfc_token_gen(int ndef,int * id,struct wpabuf ** pubkey,struct wpabuf ** privkey,struct wpabuf ** dev_pw)688 struct wpabuf * wps_nfc_token_gen(int ndef, int *id, struct wpabuf **pubkey,
689 struct wpabuf **privkey,
690 struct wpabuf **dev_pw)
691 {
692 struct wpabuf *pw;
693 u16 val;
694
695 pw = wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN);
696 if (pw == NULL)
697 return NULL;
698
699 if (random_get_bytes(wpabuf_put(pw, WPS_OOB_DEVICE_PASSWORD_LEN),
700 WPS_OOB_DEVICE_PASSWORD_LEN) ||
701 random_get_bytes((u8 *) &val, sizeof(val))) {
702 wpabuf_free(pw);
703 return NULL;
704 }
705
706 if (wps_nfc_gen_dh(pubkey, privkey) < 0) {
707 wpabuf_free(pw);
708 return NULL;
709 }
710
711 *id = 0x10 + val % 0xfff0;
712 wpabuf_clear_free(*dev_pw);
713 *dev_pw = pw;
714
715 return wps_nfc_token_build(ndef, *id, *pubkey, *dev_pw);
716 }
717
718
wps_build_nfc_handover_req(struct wps_context * ctx,struct wpabuf * nfc_dh_pubkey)719 struct wpabuf * wps_build_nfc_handover_req(struct wps_context *ctx,
720 struct wpabuf *nfc_dh_pubkey)
721 {
722 struct wpabuf *msg;
723 void *len;
724
725 if (ctx == NULL)
726 return NULL;
727
728 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
729 "handover request");
730
731 if (nfc_dh_pubkey == NULL) {
732 wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
733 "configured");
734 return NULL;
735 }
736
737 msg = wpabuf_alloc(1000);
738 if (msg == NULL)
739 return msg;
740 len = wpabuf_put(msg, 2);
741
742 if (wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
743 nfc_dh_pubkey, NULL, 0) ||
744 wps_build_uuid_e(msg, ctx->uuid) ||
745 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) {
746 wpabuf_free(msg);
747 return NULL;
748 }
749
750 WPA_PUT_BE16(len, wpabuf_len(msg) - 2);
751
752 return msg;
753 }
754
755
wps_build_ssid(struct wpabuf * msg,struct wps_context * wps)756 static int wps_build_ssid(struct wpabuf *msg, struct wps_context *wps)
757 {
758 wpa_printf(MSG_DEBUG, "WPS: * SSID");
759 wpa_hexdump_ascii(MSG_DEBUG, "WPS: SSID in Connection Handover Select",
760 wps->ssid, wps->ssid_len);
761 wpabuf_put_be16(msg, ATTR_SSID);
762 wpabuf_put_be16(msg, wps->ssid_len);
763 wpabuf_put_data(msg, wps->ssid, wps->ssid_len);
764 return 0;
765 }
766
767
wps_build_ap_freq(struct wpabuf * msg,int freq)768 static int wps_build_ap_freq(struct wpabuf *msg, int freq)
769 {
770 enum hostapd_hw_mode mode;
771 u8 channel, rf_band;
772 u16 ap_channel;
773
774 if (freq <= 0)
775 return 0;
776
777 mode = ieee80211_freq_to_chan(freq, &channel);
778 if (mode == NUM_HOSTAPD_MODES)
779 return 0; /* Unknown channel */
780
781 if (mode == HOSTAPD_MODE_IEEE80211G || mode == HOSTAPD_MODE_IEEE80211B)
782 rf_band = WPS_RF_24GHZ;
783 else if (mode == HOSTAPD_MODE_IEEE80211A)
784 rf_band = WPS_RF_50GHZ;
785 else if (mode == HOSTAPD_MODE_IEEE80211AD)
786 rf_band = WPS_RF_60GHZ;
787 else
788 return 0; /* Unknown band */
789 ap_channel = channel;
790
791 if (wps_build_rf_bands_attr(msg, rf_band) ||
792 wps_build_ap_channel(msg, ap_channel))
793 return -1;
794
795 return 0;
796 }
797
798
wps_build_nfc_handover_sel(struct wps_context * ctx,struct wpabuf * nfc_dh_pubkey,const u8 * bssid,int freq)799 struct wpabuf * wps_build_nfc_handover_sel(struct wps_context *ctx,
800 struct wpabuf *nfc_dh_pubkey,
801 const u8 *bssid, int freq)
802 {
803 struct wpabuf *msg;
804 void *len;
805
806 if (ctx == NULL)
807 return NULL;
808
809 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
810 "handover select");
811
812 if (nfc_dh_pubkey == NULL) {
813 wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
814 "configured");
815 return NULL;
816 }
817
818 msg = wpabuf_alloc(1000);
819 if (msg == NULL)
820 return msg;
821 len = wpabuf_put(msg, 2);
822
823 if (wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
824 nfc_dh_pubkey, NULL, 0) ||
825 wps_build_ssid(msg, ctx) ||
826 wps_build_ap_freq(msg, freq) ||
827 (bssid && wps_build_mac_addr(msg, bssid)) ||
828 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) {
829 wpabuf_free(msg);
830 return NULL;
831 }
832
833 WPA_PUT_BE16(len, wpabuf_len(msg) - 2);
834
835 return msg;
836 }
837
838
wps_build_nfc_handover_req_p2p(struct wps_context * ctx,struct wpabuf * nfc_dh_pubkey)839 struct wpabuf * wps_build_nfc_handover_req_p2p(struct wps_context *ctx,
840 struct wpabuf *nfc_dh_pubkey)
841 {
842 struct wpabuf *msg;
843
844 if (ctx == NULL)
845 return NULL;
846
847 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
848 "handover request (P2P)");
849
850 if (nfc_dh_pubkey == NULL) {
851 wpa_printf(MSG_DEBUG, "WPS: No NFC DH Public Key configured");
852 return NULL;
853 }
854
855 msg = wpabuf_alloc(1000);
856 if (msg == NULL)
857 return msg;
858
859 if (wps_build_manufacturer(&ctx->dev, msg) ||
860 wps_build_model_name(&ctx->dev, msg) ||
861 wps_build_model_number(&ctx->dev, msg) ||
862 wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
863 nfc_dh_pubkey, NULL, 0) ||
864 wps_build_rf_bands(&ctx->dev, msg, 0) ||
865 wps_build_serial_number(&ctx->dev, msg) ||
866 wps_build_uuid_e(msg, ctx->uuid) ||
867 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) {
868 wpabuf_free(msg);
869 return NULL;
870 }
871
872 return msg;
873 }
874
875
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)876 struct wpabuf * wps_build_nfc_handover_sel_p2p(struct wps_context *ctx,
877 int nfc_dev_pw_id,
878 struct wpabuf *nfc_dh_pubkey,
879 struct wpabuf *nfc_dev_pw)
880 {
881 struct wpabuf *msg;
882 const u8 *dev_pw;
883 size_t dev_pw_len;
884
885 if (ctx == NULL)
886 return NULL;
887
888 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
889 "handover select (P2P)");
890
891 if (nfc_dh_pubkey == NULL ||
892 (nfc_dev_pw_id != DEV_PW_NFC_CONNECTION_HANDOVER &&
893 nfc_dev_pw == NULL)) {
894 wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
895 "configured");
896 return NULL;
897 }
898
899 msg = wpabuf_alloc(1000);
900 if (msg == NULL)
901 return msg;
902
903 if (nfc_dev_pw) {
904 dev_pw = wpabuf_head(nfc_dev_pw);
905 dev_pw_len = wpabuf_len(nfc_dev_pw);
906 } else {
907 dev_pw = NULL;
908 dev_pw_len = 0;
909 }
910
911 if (wps_build_manufacturer(&ctx->dev, msg) ||
912 wps_build_model_name(&ctx->dev, msg) ||
913 wps_build_model_number(&ctx->dev, msg) ||
914 wps_build_oob_dev_pw(msg, nfc_dev_pw_id, nfc_dh_pubkey,
915 dev_pw, dev_pw_len) ||
916 wps_build_rf_bands(&ctx->dev, msg, 0) ||
917 wps_build_serial_number(&ctx->dev, msg) ||
918 wps_build_uuid_e(msg, ctx->uuid) ||
919 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) {
920 wpabuf_free(msg);
921 return NULL;
922 }
923
924 return msg;
925 }
926
927 #endif /* CONFIG_WPS_NFC */
928
