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_clear_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_clear_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 int 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 if (hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd,
138 (dev_passwd_len + 1) / 2, hash) < 0)
139 return -1;
140 os_memcpy(wps->psk1, hash, WPS_PSK_LEN);
141 if (hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN,
142 dev_passwd + (dev_passwd_len + 1) / 2,
143 dev_passwd_len / 2, hash) < 0)
144 return -1;
145 os_memcpy(wps->psk2, hash, WPS_PSK_LEN);
146
147 wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Device Password",
148 dev_passwd, dev_passwd_len);
149 wpa_hexdump_key(MSG_DEBUG, "WPS: PSK1", wps->psk1, WPS_PSK_LEN);
150 wpa_hexdump_key(MSG_DEBUG, "WPS: PSK2", wps->psk2, WPS_PSK_LEN);
151 return 0;
152 }
153
154
wps_decrypt_encr_settings(struct wps_data * wps,const u8 * encr,size_t encr_len)155 struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr,
156 size_t encr_len)
157 {
158 struct wpabuf *decrypted;
159 const size_t block_size = 16;
160 size_t i;
161 u8 pad;
162 const u8 *pos;
163
164 /* AES-128-CBC */
165 if (encr == NULL || encr_len < 2 * block_size || encr_len % block_size)
166 {
167 wpa_printf(MSG_DEBUG, "WPS: No Encrypted Settings received");
168 return NULL;
169 }
170
171 decrypted = wpabuf_alloc(encr_len - block_size);
172 if (decrypted == NULL)
173 return NULL;
174
175 wpa_hexdump(MSG_MSGDUMP, "WPS: Encrypted Settings", encr, encr_len);
176 wpabuf_put_data(decrypted, encr + block_size, encr_len - block_size);
177 if (aes_128_cbc_decrypt(wps->keywrapkey, encr, wpabuf_mhead(decrypted),
178 wpabuf_len(decrypted))) {
179 wpabuf_clear_free(decrypted);
180 return NULL;
181 }
182
183 wpa_hexdump_buf_key(MSG_MSGDUMP, "WPS: Decrypted Encrypted Settings",
184 decrypted);
185
186 pos = wpabuf_head_u8(decrypted) + wpabuf_len(decrypted) - 1;
187 pad = *pos;
188 if (pad > wpabuf_len(decrypted)) {
189 wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad value");
190 wpabuf_clear_free(decrypted);
191 return NULL;
192 }
193 for (i = 0; i < pad; i++) {
194 if (*pos-- != pad) {
195 wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad "
196 "string");
197 wpabuf_clear_free(decrypted);
198 return NULL;
199 }
200 }
201 decrypted->used -= pad;
202
203 return decrypted;
204 }
205
206
207 /**
208 * wps_pin_checksum - Compute PIN checksum
209 * @pin: Seven digit PIN (i.e., eight digit PIN without the checksum digit)
210 * Returns: Checksum digit
211 */
wps_pin_checksum(unsigned int pin)212 unsigned int wps_pin_checksum(unsigned int pin)
213 {
214 unsigned int accum = 0;
215 while (pin) {
216 accum += 3 * (pin % 10);
217 pin /= 10;
218 accum += pin % 10;
219 pin /= 10;
220 }
221
222 return (10 - accum % 10) % 10;
223 }
224
225
226 /**
227 * wps_pin_valid - Check whether a PIN has a valid checksum
228 * @pin: Eight digit PIN (i.e., including the checksum digit)
229 * Returns: 1 if checksum digit is valid, or 0 if not
230 */
wps_pin_valid(unsigned int pin)231 unsigned int wps_pin_valid(unsigned int pin)
232 {
233 return wps_pin_checksum(pin / 10) == (pin % 10);
234 }
235
236
237 /**
238 * wps_generate_pin - Generate a random PIN
239 * Returns: Eight digit PIN (i.e., including the checksum digit)
240 */
wps_generate_pin(unsigned int * pin)241 int wps_generate_pin(unsigned int *pin)
242 {
243 unsigned int val;
244
245 /* Generate seven random digits for the PIN */
246 if (random_get_bytes((unsigned char *) &val, sizeof(val)) < 0)
247 return -1;
248 val %= 10000000;
249
250 /* Append checksum digit */
251 *pin = val * 10 + wps_pin_checksum(val);
252 return 0;
253 }
254
255
wps_pin_str_valid(const char * pin)256 int wps_pin_str_valid(const char *pin)
257 {
258 const char *p;
259 size_t len;
260
261 p = pin;
262 while (*p >= '0' && *p <= '9')
263 p++;
264 if (*p != '\0')
265 return 0;
266
267 len = p - pin;
268 return len == 4 || len == 8;
269 }
270
271
wps_fail_event(struct wps_context * wps,enum wps_msg_type msg,u16 config_error,u16 error_indication,const u8 * mac_addr)272 void wps_fail_event(struct wps_context *wps, enum wps_msg_type msg,
273 u16 config_error, u16 error_indication, const u8 *mac_addr)
274 {
275 union wps_event_data data;
276
277 if (wps->event_cb == NULL)
278 return;
279
280 os_memset(&data, 0, sizeof(data));
281 data.fail.msg = msg;
282 data.fail.config_error = config_error;
283 data.fail.error_indication = error_indication;
284 os_memcpy(data.fail.peer_macaddr, mac_addr, ETH_ALEN);
285 wps->event_cb(wps->cb_ctx, WPS_EV_FAIL, &data);
286 }
287
288
wps_success_event(struct wps_context * wps,const u8 * mac_addr)289 void wps_success_event(struct wps_context *wps, const u8 *mac_addr)
290 {
291 union wps_event_data data;
292
293 if (wps->event_cb == NULL)
294 return;
295
296 os_memset(&data, 0, sizeof(data));
297 os_memcpy(data.success.peer_macaddr, mac_addr, ETH_ALEN);
298 wps->event_cb(wps->cb_ctx, WPS_EV_SUCCESS, &data);
299 }
300
301
wps_pwd_auth_fail_event(struct wps_context * wps,int enrollee,int part,const u8 * mac_addr)302 void wps_pwd_auth_fail_event(struct wps_context *wps, int enrollee, int part,
303 const u8 *mac_addr)
304 {
305 union wps_event_data data;
306
307 if (wps->event_cb == NULL)
308 return;
309
310 os_memset(&data, 0, sizeof(data));
311 data.pwd_auth_fail.enrollee = enrollee;
312 data.pwd_auth_fail.part = part;
313 os_memcpy(data.pwd_auth_fail.peer_macaddr, mac_addr, ETH_ALEN);
314 wps->event_cb(wps->cb_ctx, WPS_EV_PWD_AUTH_FAIL, &data);
315 }
316
317
wps_pbc_overlap_event(struct wps_context * wps)318 void wps_pbc_overlap_event(struct wps_context *wps)
319 {
320 if (wps->event_cb == NULL)
321 return;
322
323 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_OVERLAP, NULL);
324 }
325
326
wps_pbc_timeout_event(struct wps_context * wps)327 void wps_pbc_timeout_event(struct wps_context *wps)
328 {
329 if (wps->event_cb == NULL)
330 return;
331
332 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_TIMEOUT, NULL);
333 }
334
335
wps_pbc_active_event(struct wps_context * wps)336 void wps_pbc_active_event(struct wps_context *wps)
337 {
338 if (wps->event_cb == NULL)
339 return;
340
341 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_ACTIVE, NULL);
342 }
343
344
wps_pbc_disable_event(struct wps_context * wps)345 void wps_pbc_disable_event(struct wps_context *wps)
346 {
347 if (wps->event_cb == NULL)
348 return;
349
350 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_DISABLE, NULL);
351 }
352
353
354 #ifdef CONFIG_WPS_OOB
355
wps_get_oob_cred(struct wps_context * wps,int rf_band,int channel)356 struct wpabuf * wps_get_oob_cred(struct wps_context *wps, int rf_band,
357 int channel)
358 {
359 struct wps_data data;
360 struct wpabuf *plain;
361
362 plain = wpabuf_alloc(500);
363 if (plain == NULL) {
364 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
365 "credential");
366 return NULL;
367 }
368
369 os_memset(&data, 0, sizeof(data));
370 data.wps = wps;
371 data.auth_type = wps->auth_types;
372 data.encr_type = wps->encr_types;
373 if (wps_build_cred(&data, plain) ||
374 (rf_band && wps_build_rf_bands_attr(plain, rf_band)) ||
375 (channel && wps_build_ap_channel(plain, channel)) ||
376 wps_build_mac_addr(plain, wps->dev.mac_addr) ||
377 wps_build_wfa_ext(plain, 0, NULL, 0, 0)) {
378 os_free(data.new_psk);
379 wpabuf_clear_free(plain);
380 return NULL;
381 }
382
383 if (wps->wps_state == WPS_STATE_NOT_CONFIGURED && data.new_psk &&
384 wps->ap) {
385 struct wps_credential cred;
386
387 wpa_printf(MSG_DEBUG, "WPS: Moving to Configured state based "
388 "on credential token generation");
389
390 os_memset(&cred, 0, sizeof(cred));
391 os_memcpy(cred.ssid, wps->ssid, wps->ssid_len);
392 cred.ssid_len = wps->ssid_len;
393 cred.auth_type = WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK;
394 cred.encr_type = WPS_ENCR_TKIP | WPS_ENCR_AES;
395 os_memcpy(cred.key, data.new_psk, data.new_psk_len);
396 cred.key_len = data.new_psk_len;
397
398 wps->wps_state = WPS_STATE_CONFIGURED;
399 wpa_hexdump_ascii_key(MSG_DEBUG,
400 "WPS: Generated random passphrase",
401 data.new_psk, data.new_psk_len);
402 if (wps->cred_cb)
403 wps->cred_cb(wps->cb_ctx, &cred);
404 }
405
406 os_free(data.new_psk);
407
408 return plain;
409 }
410
411
wps_build_nfc_pw_token(u16 dev_pw_id,const struct wpabuf * pubkey,const struct wpabuf * dev_pw)412 struct wpabuf * wps_build_nfc_pw_token(u16 dev_pw_id,
413 const struct wpabuf *pubkey,
414 const struct wpabuf *dev_pw)
415 {
416 struct wpabuf *data;
417
418 data = wpabuf_alloc(200);
419 if (data == NULL)
420 return NULL;
421
422 if (wps_build_oob_dev_pw(data, dev_pw_id, pubkey,
423 wpabuf_head(dev_pw), wpabuf_len(dev_pw)) ||
424 wps_build_wfa_ext(data, 0, NULL, 0, 0)) {
425 wpa_printf(MSG_ERROR, "WPS: Failed to build NFC password "
426 "token");
427 wpabuf_clear_free(data);
428 return NULL;
429 }
430
431 return data;
432 }
433
434
wps_oob_use_cred(struct wps_context * wps,struct wps_parse_attr * attr)435 int wps_oob_use_cred(struct wps_context *wps, struct wps_parse_attr *attr)
436 {
437 struct wpabuf msg;
438 size_t i;
439
440 for (i = 0; i < attr->num_cred; i++) {
441 struct wps_credential local_cred;
442 struct wps_parse_attr cattr;
443
444 os_memset(&local_cred, 0, sizeof(local_cred));
445 wpabuf_set(&msg, attr->cred[i], attr->cred_len[i]);
446 if (wps_parse_msg(&msg, &cattr) < 0 ||
447 wps_process_cred(&cattr, &local_cred)) {
448 wpa_printf(MSG_ERROR, "WPS: Failed to parse OOB "
449 "credential");
450 return -1;
451 }
452 wps->cred_cb(wps->cb_ctx, &local_cred);
453 }
454
455 return 0;
456 }
457
458
459 #endif /* CONFIG_WPS_OOB */
460
461
wps_dev_type_str2bin(const char * str,u8 dev_type[WPS_DEV_TYPE_LEN])462 int wps_dev_type_str2bin(const char *str, u8 dev_type[WPS_DEV_TYPE_LEN])
463 {
464 const char *pos;
465
466 /* <categ>-<OUI>-<subcateg> */
467 WPA_PUT_BE16(dev_type, atoi(str));
468 pos = os_strchr(str, '-');
469 if (pos == NULL)
470 return -1;
471 pos++;
472 if (hexstr2bin(pos, &dev_type[2], 4))
473 return -1;
474 pos = os_strchr(pos, '-');
475 if (pos == NULL)
476 return -1;
477 pos++;
478 WPA_PUT_BE16(&dev_type[6], atoi(pos));
479
480
481 return 0;
482 }
483
484
wps_dev_type_bin2str(const u8 dev_type[WPS_DEV_TYPE_LEN],char * buf,size_t buf_len)485 char * wps_dev_type_bin2str(const u8 dev_type[WPS_DEV_TYPE_LEN], char *buf,
486 size_t buf_len)
487 {
488 int ret;
489
490 ret = os_snprintf(buf, buf_len, "%u-%08X-%u",
491 WPA_GET_BE16(dev_type), WPA_GET_BE32(&dev_type[2]),
492 WPA_GET_BE16(&dev_type[6]));
493 if (os_snprintf_error(buf_len, ret))
494 return NULL;
495
496 return buf;
497 }
498
499
uuid_gen_mac_addr(const u8 * mac_addr,u8 * uuid)500 void uuid_gen_mac_addr(const u8 *mac_addr, u8 *uuid)
501 {
502 const u8 *addr[2];
503 size_t len[2];
504 u8 hash[SHA1_MAC_LEN];
505 u8 nsid[16] = {
506 0x52, 0x64, 0x80, 0xf8,
507 0xc9, 0x9b,
508 0x4b, 0xe5,
509 0xa6, 0x55,
510 0x58, 0xed, 0x5f, 0x5d, 0x60, 0x84
511 };
512
513 addr[0] = nsid;
514 len[0] = sizeof(nsid);
515 addr[1] = mac_addr;
516 len[1] = 6;
517 sha1_vector(2, addr, len, hash);
518 os_memcpy(uuid, hash, 16);
519
520 /* Version: 5 = named-based version using SHA-1 */
521 uuid[6] = (5 << 4) | (uuid[6] & 0x0f);
522
523 /* Variant specified in RFC 4122 */
524 uuid[8] = 0x80 | (uuid[8] & 0x3f);
525 }
526
527
wps_config_methods_str2bin(const char * str)528 u16 wps_config_methods_str2bin(const char *str)
529 {
530 u16 methods = 0;
531
532 if (str == NULL || str[0] == '\0') {
533 /* Default to enabling methods based on build configuration */
534 methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
535 methods |= WPS_CONFIG_VIRT_DISPLAY;
536 #ifdef CONFIG_WPS_NFC
537 methods |= WPS_CONFIG_NFC_INTERFACE;
538 #endif /* CONFIG_WPS_NFC */
539 #ifdef CONFIG_P2P
540 methods |= WPS_CONFIG_P2PS;
541 #endif /* CONFIG_P2P */
542 } else {
543 if (os_strstr(str, "ethernet"))
544 methods |= WPS_CONFIG_ETHERNET;
545 if (os_strstr(str, "label"))
546 methods |= WPS_CONFIG_LABEL;
547 if (os_strstr(str, "display"))
548 methods |= WPS_CONFIG_DISPLAY;
549 if (os_strstr(str, "ext_nfc_token"))
550 methods |= WPS_CONFIG_EXT_NFC_TOKEN;
551 if (os_strstr(str, "int_nfc_token"))
552 methods |= WPS_CONFIG_INT_NFC_TOKEN;
553 if (os_strstr(str, "nfc_interface"))
554 methods |= WPS_CONFIG_NFC_INTERFACE;
555 if (os_strstr(str, "push_button"))
556 methods |= WPS_CONFIG_PUSHBUTTON;
557 if (os_strstr(str, "keypad"))
558 methods |= WPS_CONFIG_KEYPAD;
559 if (os_strstr(str, "virtual_display"))
560 methods |= WPS_CONFIG_VIRT_DISPLAY;
561 if (os_strstr(str, "physical_display"))
562 methods |= WPS_CONFIG_PHY_DISPLAY;
563 if (os_strstr(str, "virtual_push_button"))
564 methods |= WPS_CONFIG_VIRT_PUSHBUTTON;
565 if (os_strstr(str, "physical_push_button"))
566 methods |= WPS_CONFIG_PHY_PUSHBUTTON;
567 if (os_strstr(str, "p2ps"))
568 methods |= WPS_CONFIG_P2PS;
569 }
570
571 return methods;
572 }
573
574
wps_build_wsc_ack(struct wps_data * wps)575 struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
576 {
577 struct wpabuf *msg;
578
579 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
580
581 msg = wpabuf_alloc(1000);
582 if (msg == NULL)
583 return NULL;
584
585 if (wps_build_version(msg) ||
586 wps_build_msg_type(msg, WPS_WSC_ACK) ||
587 wps_build_enrollee_nonce(wps, msg) ||
588 wps_build_registrar_nonce(wps, msg) ||
589 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) {
590 wpabuf_free(msg);
591 return NULL;
592 }
593
594 return msg;
595 }
596
597
wps_build_wsc_nack(struct wps_data * wps)598 struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
599 {
600 struct wpabuf *msg;
601
602 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
603
604 msg = wpabuf_alloc(1000);
605 if (msg == NULL)
606 return NULL;
607
608 if (wps_build_version(msg) ||
609 wps_build_msg_type(msg, WPS_WSC_NACK) ||
610 wps_build_enrollee_nonce(wps, msg) ||
611 wps_build_registrar_nonce(wps, msg) ||
612 wps_build_config_error(msg, wps->config_error) ||
613 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) {
614 wpabuf_free(msg);
615 return NULL;
616 }
617
618 return msg;
619 }
620
621
622 #ifdef CONFIG_WPS_NFC
623
wps_nfc_token_build(int ndef,int id,struct wpabuf * pubkey,struct wpabuf * dev_pw)624 struct wpabuf * wps_nfc_token_build(int ndef, int id, struct wpabuf *pubkey,
625 struct wpabuf *dev_pw)
626 {
627 struct wpabuf *ret;
628
629 if (pubkey == NULL || dev_pw == NULL)
630 return NULL;
631
632 ret = wps_build_nfc_pw_token(id, pubkey, dev_pw);
633 if (ndef && ret) {
634 struct wpabuf *tmp;
635 tmp = ndef_build_wifi(ret);
636 wpabuf_free(ret);
637 if (tmp == NULL)
638 return NULL;
639 ret = tmp;
640 }
641
642 return ret;
643 }
644
645
wps_nfc_gen_dh(struct wpabuf ** pubkey,struct wpabuf ** privkey)646 int wps_nfc_gen_dh(struct wpabuf **pubkey, struct wpabuf **privkey)
647 {
648 struct wpabuf *priv = NULL, *pub = NULL;
649 void *dh_ctx;
650
651 dh_ctx = dh5_init(&priv, &pub);
652 if (dh_ctx == NULL)
653 return -1;
654 pub = wpabuf_zeropad(pub, 192);
655 if (pub == NULL) {
656 wpabuf_free(priv);
657 dh5_free(dh_ctx);
658 return -1;
659 }
660 wpa_hexdump_buf(MSG_DEBUG, "WPS: Generated new DH pubkey", pub);
661 dh5_free(dh_ctx);
662
663 wpabuf_free(*pubkey);
664 *pubkey = pub;
665 wpabuf_clear_free(*privkey);
666 *privkey = priv;
667
668 return 0;
669 }
670
671
wps_nfc_token_gen(int ndef,int * id,struct wpabuf ** pubkey,struct wpabuf ** privkey,struct wpabuf ** dev_pw)672 struct wpabuf * wps_nfc_token_gen(int ndef, int *id, struct wpabuf **pubkey,
673 struct wpabuf **privkey,
674 struct wpabuf **dev_pw)
675 {
676 struct wpabuf *pw;
677 u16 val;
678
679 pw = wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN);
680 if (pw == NULL)
681 return NULL;
682
683 if (random_get_bytes(wpabuf_put(pw, WPS_OOB_DEVICE_PASSWORD_LEN),
684 WPS_OOB_DEVICE_PASSWORD_LEN) ||
685 random_get_bytes((u8 *) &val, sizeof(val))) {
686 wpabuf_free(pw);
687 return NULL;
688 }
689
690 if (wps_nfc_gen_dh(pubkey, privkey) < 0) {
691 wpabuf_free(pw);
692 return NULL;
693 }
694
695 *id = 0x10 + val % 0xfff0;
696 wpabuf_clear_free(*dev_pw);
697 *dev_pw = pw;
698
699 return wps_nfc_token_build(ndef, *id, *pubkey, *dev_pw);
700 }
701
702
wps_build_nfc_handover_req(struct wps_context * ctx,struct wpabuf * nfc_dh_pubkey)703 struct wpabuf * wps_build_nfc_handover_req(struct wps_context *ctx,
704 struct wpabuf *nfc_dh_pubkey)
705 {
706 struct wpabuf *msg;
707 void *len;
708
709 if (ctx == NULL)
710 return NULL;
711
712 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
713 "handover request");
714
715 if (nfc_dh_pubkey == NULL) {
716 wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
717 "configured");
718 return NULL;
719 }
720
721 msg = wpabuf_alloc(1000);
722 if (msg == NULL)
723 return msg;
724 len = wpabuf_put(msg, 2);
725
726 if (wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
727 nfc_dh_pubkey, NULL, 0) ||
728 wps_build_uuid_e(msg, ctx->uuid) ||
729 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) {
730 wpabuf_free(msg);
731 return NULL;
732 }
733
734 WPA_PUT_BE16(len, wpabuf_len(msg) - 2);
735
736 return msg;
737 }
738
739
wps_build_ssid(struct wpabuf * msg,struct wps_context * wps)740 static int wps_build_ssid(struct wpabuf *msg, struct wps_context *wps)
741 {
742 wpa_printf(MSG_DEBUG, "WPS: * SSID");
743 wpa_hexdump_ascii(MSG_DEBUG, "WPS: SSID in Connection Handover Select",
744 wps->ssid, wps->ssid_len);
745 wpabuf_put_be16(msg, ATTR_SSID);
746 wpabuf_put_be16(msg, wps->ssid_len);
747 wpabuf_put_data(msg, wps->ssid, wps->ssid_len);
748 return 0;
749 }
750
751
wps_build_ap_freq(struct wpabuf * msg,int freq)752 static int wps_build_ap_freq(struct wpabuf *msg, int freq)
753 {
754 enum hostapd_hw_mode mode;
755 u8 channel, rf_band;
756 u16 ap_channel;
757
758 if (freq <= 0)
759 return 0;
760
761 mode = ieee80211_freq_to_chan(freq, &channel);
762 if (mode == NUM_HOSTAPD_MODES)
763 return 0; /* Unknown channel */
764
765 if (mode == HOSTAPD_MODE_IEEE80211G || mode == HOSTAPD_MODE_IEEE80211B)
766 rf_band = WPS_RF_24GHZ;
767 else if (mode == HOSTAPD_MODE_IEEE80211A)
768 rf_band = WPS_RF_50GHZ;
769 else if (mode == HOSTAPD_MODE_IEEE80211AD)
770 rf_band = WPS_RF_60GHZ;
771 else
772 return 0; /* Unknown band */
773 ap_channel = channel;
774
775 if (wps_build_rf_bands_attr(msg, rf_band) ||
776 wps_build_ap_channel(msg, ap_channel))
777 return -1;
778
779 return 0;
780 }
781
782
wps_build_nfc_handover_sel(struct wps_context * ctx,struct wpabuf * nfc_dh_pubkey,const u8 * bssid,int freq)783 struct wpabuf * wps_build_nfc_handover_sel(struct wps_context *ctx,
784 struct wpabuf *nfc_dh_pubkey,
785 const u8 *bssid, int freq)
786 {
787 struct wpabuf *msg;
788 void *len;
789
790 if (ctx == NULL)
791 return NULL;
792
793 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
794 "handover select");
795
796 if (nfc_dh_pubkey == NULL) {
797 wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
798 "configured");
799 return NULL;
800 }
801
802 msg = wpabuf_alloc(1000);
803 if (msg == NULL)
804 return msg;
805 len = wpabuf_put(msg, 2);
806
807 if (wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
808 nfc_dh_pubkey, NULL, 0) ||
809 wps_build_ssid(msg, ctx) ||
810 wps_build_ap_freq(msg, freq) ||
811 (bssid && wps_build_mac_addr(msg, bssid)) ||
812 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) {
813 wpabuf_free(msg);
814 return NULL;
815 }
816
817 WPA_PUT_BE16(len, wpabuf_len(msg) - 2);
818
819 return msg;
820 }
821
822
wps_build_nfc_handover_req_p2p(struct wps_context * ctx,struct wpabuf * nfc_dh_pubkey)823 struct wpabuf * wps_build_nfc_handover_req_p2p(struct wps_context *ctx,
824 struct wpabuf *nfc_dh_pubkey)
825 {
826 struct wpabuf *msg;
827
828 if (ctx == NULL)
829 return NULL;
830
831 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
832 "handover request (P2P)");
833
834 if (nfc_dh_pubkey == NULL) {
835 wpa_printf(MSG_DEBUG, "WPS: No NFC DH Public Key configured");
836 return NULL;
837 }
838
839 msg = wpabuf_alloc(1000);
840 if (msg == NULL)
841 return msg;
842
843 if (wps_build_manufacturer(&ctx->dev, msg) ||
844 wps_build_model_name(&ctx->dev, msg) ||
845 wps_build_model_number(&ctx->dev, msg) ||
846 wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
847 nfc_dh_pubkey, NULL, 0) ||
848 wps_build_rf_bands(&ctx->dev, msg, 0) ||
849 wps_build_serial_number(&ctx->dev, msg) ||
850 wps_build_uuid_e(msg, ctx->uuid) ||
851 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) {
852 wpabuf_free(msg);
853 return NULL;
854 }
855
856 return msg;
857 }
858
859
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)860 struct wpabuf * wps_build_nfc_handover_sel_p2p(struct wps_context *ctx,
861 int nfc_dev_pw_id,
862 struct wpabuf *nfc_dh_pubkey,
863 struct wpabuf *nfc_dev_pw)
864 {
865 struct wpabuf *msg;
866 const u8 *dev_pw;
867 size_t dev_pw_len;
868
869 if (ctx == NULL)
870 return NULL;
871
872 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
873 "handover select (P2P)");
874
875 if (nfc_dh_pubkey == NULL ||
876 (nfc_dev_pw_id != DEV_PW_NFC_CONNECTION_HANDOVER &&
877 nfc_dev_pw == NULL)) {
878 wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
879 "configured");
880 return NULL;
881 }
882
883 msg = wpabuf_alloc(1000);
884 if (msg == NULL)
885 return msg;
886
887 if (nfc_dev_pw) {
888 dev_pw = wpabuf_head(nfc_dev_pw);
889 dev_pw_len = wpabuf_len(nfc_dev_pw);
890 } else {
891 dev_pw = NULL;
892 dev_pw_len = 0;
893 }
894
895 if (wps_build_manufacturer(&ctx->dev, msg) ||
896 wps_build_model_name(&ctx->dev, msg) ||
897 wps_build_model_number(&ctx->dev, msg) ||
898 wps_build_oob_dev_pw(msg, nfc_dev_pw_id, nfc_dh_pubkey,
899 dev_pw, dev_pw_len) ||
900 wps_build_rf_bands(&ctx->dev, msg, 0) ||
901 wps_build_serial_number(&ctx->dev, msg) ||
902 wps_build_uuid_e(msg, ctx->uuid) ||
903 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) {
904 wpabuf_free(msg);
905 return NULL;
906 }
907
908 return msg;
909 }
910
911 #endif /* CONFIG_WPS_NFC */
912