Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / wps / wps_common.c
CommitLineData
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1/*
2 * Wi-Fi Protected Setup - common functionality
4781064b 3 * Copyright (c) 2008-2012, Jouni Malinen <j@w1.fi>
a875087d 4 *
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5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
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7 */
8
9#include "includes.h"
10
11#include "common.h"
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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"
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20#include "wps_i.h"
21#include "wps_dev_attr.h"
22
23
24void 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
62int 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
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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;
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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
132void 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
152struct 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 */
209unsigned 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 */
228unsigned 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 */
238unsigned int wps_generate_pin(void)
239{
240 unsigned int val;
241
242 /* Generate seven random digits for the PIN */
4781064b 243 if (random_get_bytes((unsigned char *) &val, sizeof(val)) < 0) {
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244 struct os_time now;
245 os_get_time(&now);
246 val = os_random() ^ now.sec ^ now.usec;
247 }
248 val %= 10000000;
249
250 /* Append checksum digit */
251 return val * 10 + wps_pin_checksum(val);
252}
253
254
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255int wps_pin_str_valid(const char *pin)
256{
257 const char *p;
258 size_t len;
259
260 p = pin;
261 while (*p >= '0' && *p <= '9')
262 p++;
263 if (*p != '\0')
264 return 0;
265
266 len = p - pin;
267 return len == 4 || len == 8;
268}
269
270
271void wps_fail_event(struct wps_context *wps, enum wps_msg_type msg,
272 u16 config_error, u16 error_indication, const u8 *mac_addr)
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273{
274 union wps_event_data data;
275
276 if (wps->event_cb == NULL)
277 return;
278
279 os_memset(&data, 0, sizeof(data));
280 data.fail.msg = msg;
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281 data.fail.config_error = config_error;
282 data.fail.error_indication = error_indication;
283 os_memcpy(data.fail.peer_macaddr, mac_addr, ETH_ALEN);
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284 wps->event_cb(wps->cb_ctx, WPS_EV_FAIL, &data);
285}
286
287
4781064b 288void wps_success_event(struct wps_context *wps, const u8 *mac_addr)
a875087d 289{
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290 union wps_event_data data;
291
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292 if (wps->event_cb == NULL)
293 return;
294
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295 os_memset(&data, 0, sizeof(data));
296 os_memcpy(data.success.peer_macaddr, mac_addr, ETH_ALEN);
297 wps->event_cb(wps->cb_ctx, WPS_EV_SUCCESS, &data);
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298}
299
300
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301void wps_pwd_auth_fail_event(struct wps_context *wps, int enrollee, int part,
302 const u8 *mac_addr)
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303{
304 union wps_event_data data;
305
306 if (wps->event_cb == NULL)
307 return;
308
309 os_memset(&data, 0, sizeof(data));
310 data.pwd_auth_fail.enrollee = enrollee;
311 data.pwd_auth_fail.part = part;
4781064b 312 os_memcpy(data.pwd_auth_fail.peer_macaddr, mac_addr, ETH_ALEN);
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313 wps->event_cb(wps->cb_ctx, WPS_EV_PWD_AUTH_FAIL, &data);
314}
315
316
317void wps_pbc_overlap_event(struct wps_context *wps)
318{
319 if (wps->event_cb == NULL)
320 return;
321
322 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_OVERLAP, NULL);
323}
324
325
326void wps_pbc_timeout_event(struct wps_context *wps)
327{
328 if (wps->event_cb == NULL)
329 return;
330
331 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_TIMEOUT, NULL);
332}
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333
334
335void wps_pbc_active_event(struct wps_context *wps)
336{
337 if (wps->event_cb == NULL)
338 return;
339
340 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_ACTIVE, NULL);
341}
342
343
344void wps_pbc_disable_event(struct wps_context *wps)
345{
346 if (wps->event_cb == NULL)
347 return;
348
349 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_DISABLE, NULL);
350}
351
352
353#ifdef CONFIG_WPS_OOB
354
355struct 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 plain = wpabuf_alloc(500);
362 if (plain == NULL) {
363 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
364 "credential");
365 return NULL;
366 }
367
368 os_memset(&data, 0, sizeof(data));
369 data.wps = wps;
370 data.auth_type = wps->auth_types;
371 data.encr_type = wps->encr_types;
372 if (wps_build_cred(&data, plain) ||
373 (rf_band && wps_build_rf_bands_attr(plain, rf_band)) ||
374 (channel && wps_build_ap_channel(plain, channel)) ||
375 wps_build_mac_addr(plain, wps->dev.mac_addr) ||
376 wps_build_wfa_ext(plain, 0, NULL, 0)) {
377 os_free(data.new_psk);
378 wpabuf_free(plain);
379 return NULL;
380 }
381
382 if (wps->wps_state == WPS_STATE_NOT_CONFIGURED && data.new_psk &&
383 wps->ap) {
384 struct wps_credential cred;
385
386 wpa_printf(MSG_DEBUG, "WPS: Moving to Configured state based "
387 "on credential token generation");
388
389 os_memset(&cred, 0, sizeof(cred));
390 os_memcpy(cred.ssid, wps->ssid, wps->ssid_len);
391 cred.ssid_len = wps->ssid_len;
392 cred.auth_type = WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK;
393 cred.encr_type = WPS_ENCR_TKIP | WPS_ENCR_AES;
394 os_memcpy(cred.key, data.new_psk, data.new_psk_len);
395 cred.key_len = data.new_psk_len;
396
397 wps->wps_state = WPS_STATE_CONFIGURED;
398 wpa_hexdump_ascii_key(MSG_DEBUG,
399 "WPS: Generated random passphrase",
400 data.new_psk, data.new_psk_len);
401 if (wps->cred_cb)
402 wps->cred_cb(wps->cb_ctx, &cred);
403 }
404
405 os_free(data.new_psk);
406
407 return plain;
408}
409
410
411struct 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 data = wpabuf_alloc(200);
418 if (data == NULL)
419 return NULL;
420
421 if (wps_build_oob_dev_pw(data, dev_pw_id, pubkey,
422 wpabuf_head(dev_pw), wpabuf_len(dev_pw)) ||
423 wps_build_wfa_ext(data, 0, NULL, 0)) {
424 wpa_printf(MSG_ERROR, "WPS: Failed to build NFC password "
425 "token");
426 wpabuf_free(data);
427 return NULL;
428 }
429
430 return data;
431}
432
433
434int wps_oob_use_cred(struct wps_context *wps, struct wps_parse_attr *attr)
435{
436 struct wpabuf msg;
437 size_t i;
438
439 for (i = 0; i < attr->num_cred; i++) {
440 struct wps_credential local_cred;
441 struct wps_parse_attr cattr;
442
443 os_memset(&local_cred, 0, sizeof(local_cred));
444 wpabuf_set(&msg, attr->cred[i], attr->cred_len[i]);
445 if (wps_parse_msg(&msg, &cattr) < 0 ||
446 wps_process_cred(&cattr, &local_cred)) {
447 wpa_printf(MSG_ERROR, "WPS: Failed to parse OOB "
448 "credential");
449 return -1;
450 }
451 wps->cred_cb(wps->cb_ctx, &local_cred);
452 }
453
454 return 0;
455}
456
457
458#endif /* CONFIG_WPS_OOB */
459
460
461int 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 WPA_PUT_BE16(dev_type, atoi(str));
467 pos = os_strchr(str, '-');
468 if (pos == NULL)
469 return -1;
470 pos++;
471 if (hexstr2bin(pos, &dev_type[2], 4))
472 return -1;
473 pos = os_strchr(pos, '-');
474 if (pos == NULL)
475 return -1;
476 pos++;
477 WPA_PUT_BE16(&dev_type[6], atoi(pos));
478
479
480 return 0;
481}
482
483
484char * 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 ret = os_snprintf(buf, buf_len, "%u-%08X-%u",
490 WPA_GET_BE16(dev_type), WPA_GET_BE32(&dev_type[2]),
491 WPA_GET_BE16(&dev_type[6]));
492 if (ret < 0 || (unsigned int) ret >= buf_len)
493 return NULL;
494
495 return buf;
496}
497
498
499void 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 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 addr[0] = nsid;
513 len[0] = sizeof(nsid);
514 addr[1] = mac_addr;
515 len[1] = 6;
516 sha1_vector(2, addr, len, hash);
517 os_memcpy(uuid, hash, 16);
518
519 /* Version: 5 = named-based version using SHA-1 */
520 uuid[6] = (5 << 4) | (uuid[6] & 0x0f);
521
522 /* Variant specified in RFC 4122 */
523 uuid[8] = 0x80 | (uuid[8] & 0x3f);
524}
525
526
527u16 wps_config_methods_str2bin(const char *str)
528{
529 u16 methods = 0;
530
531 if (str == NULL) {
532 /* Default to enabling methods based on build configuration */
533 methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
534#ifdef CONFIG_WPS2
535 methods |= WPS_CONFIG_VIRT_DISPLAY;
536#endif /* CONFIG_WPS2 */
537#ifdef CONFIG_WPS_NFC
538 methods |= WPS_CONFIG_NFC_INTERFACE;
539#endif /* CONFIG_WPS_NFC */
540 } else {
541 if (os_strstr(str, "ethernet"))
542 methods |= WPS_CONFIG_ETHERNET;
543 if (os_strstr(str, "label"))
544 methods |= WPS_CONFIG_LABEL;
545 if (os_strstr(str, "display"))
546 methods |= WPS_CONFIG_DISPLAY;
547 if (os_strstr(str, "ext_nfc_token"))
548 methods |= WPS_CONFIG_EXT_NFC_TOKEN;
549 if (os_strstr(str, "int_nfc_token"))
550 methods |= WPS_CONFIG_INT_NFC_TOKEN;
551 if (os_strstr(str, "nfc_interface"))
552 methods |= WPS_CONFIG_NFC_INTERFACE;
553 if (os_strstr(str, "push_button"))
554 methods |= WPS_CONFIG_PUSHBUTTON;
555 if (os_strstr(str, "keypad"))
556 methods |= WPS_CONFIG_KEYPAD;
557#ifdef CONFIG_WPS2
558 if (os_strstr(str, "virtual_display"))
559 methods |= WPS_CONFIG_VIRT_DISPLAY;
560 if (os_strstr(str, "physical_display"))
561 methods |= WPS_CONFIG_PHY_DISPLAY;
562 if (os_strstr(str, "virtual_push_button"))
563 methods |= WPS_CONFIG_VIRT_PUSHBUTTON;
564 if (os_strstr(str, "physical_push_button"))
565 methods |= WPS_CONFIG_PHY_PUSHBUTTON;
566#endif /* CONFIG_WPS2 */
567 }
568
569 return methods;
570}
571
572
573struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
574{
575 struct wpabuf *msg;
576
577 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
578
579 msg = wpabuf_alloc(1000);
580 if (msg == NULL)
581 return NULL;
582
583 if (wps_build_version(msg) ||
584 wps_build_msg_type(msg, WPS_WSC_ACK) ||
585 wps_build_enrollee_nonce(wps, msg) ||
586 wps_build_registrar_nonce(wps, msg) ||
587 wps_build_wfa_ext(msg, 0, NULL, 0)) {
588 wpabuf_free(msg);
589 return NULL;
590 }
591
592 return msg;
593}
594
595
596struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
597{
598 struct wpabuf *msg;
599
600 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
601
602 msg = wpabuf_alloc(1000);
603 if (msg == NULL)
604 return NULL;
605
606 if (wps_build_version(msg) ||
607 wps_build_msg_type(msg, WPS_WSC_NACK) ||
608 wps_build_enrollee_nonce(wps, msg) ||
609 wps_build_registrar_nonce(wps, msg) ||
610 wps_build_config_error(msg, wps->config_error) ||
611 wps_build_wfa_ext(msg, 0, NULL, 0)) {
612 wpabuf_free(msg);
613 return NULL;
614 }
615
616 return msg;
617}
618
619
620#ifdef CONFIG_WPS_NFC
621
622struct wpabuf * wps_nfc_token_build(int ndef, int id, struct wpabuf *pubkey,
623 struct wpabuf *dev_pw)
624{
625 struct wpabuf *ret;
626
627 if (pubkey == NULL || dev_pw == NULL)
628 return NULL;
629
630 ret = wps_build_nfc_pw_token(id, pubkey, dev_pw);
631 if (ndef && ret) {
632 struct wpabuf *tmp;
633 tmp = ndef_build_wifi(ret);
634 wpabuf_free(ret);
635 if (tmp == NULL)
636 return NULL;
637 ret = tmp;
638 }
639
640 return ret;
641}
642
643
644int wps_nfc_gen_dh(struct wpabuf **pubkey, struct wpabuf **privkey)
645{
646 struct wpabuf *priv = NULL, *pub = NULL;
647 void *dh_ctx;
648
649 dh_ctx = dh5_init(&priv, &pub);
650 if (dh_ctx == NULL)
651 return -1;
652 pub = wpabuf_zeropad(pub, 192);
653 if (pub == NULL) {
654 wpabuf_free(priv);
655 return -1;
656 }
657 wpa_hexdump_buf(MSG_DEBUG, "WPS: Generated new DH pubkey", pub);
658 dh5_free(dh_ctx);
659
660 wpabuf_free(*pubkey);
661 *pubkey = pub;
662 wpabuf_free(*privkey);
663 *privkey = priv;
664
665 return 0;
666}
667
668
669struct wpabuf * wps_nfc_token_gen(int ndef, int *id, struct wpabuf **pubkey,
670 struct wpabuf **privkey,
671 struct wpabuf **dev_pw)
672{
673 struct wpabuf *pw;
674 u16 val;
675
676 pw = wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN);
677 if (pw == NULL)
678 return NULL;
679
680 if (random_get_bytes(wpabuf_put(pw, WPS_OOB_DEVICE_PASSWORD_LEN),
681 WPS_OOB_DEVICE_PASSWORD_LEN) ||
682 random_get_bytes((u8 *) &val, sizeof(val))) {
683 wpabuf_free(pw);
684 return NULL;
685 }
686
687 if (wps_nfc_gen_dh(pubkey, privkey) < 0) {
688 wpabuf_free(pw);
689 return NULL;
690 }
691
692 *id = 0x10 + val % 0xfff0;
693 wpabuf_free(*dev_pw);
694 *dev_pw = pw;
695
696 return wps_nfc_token_build(ndef, *id, *pubkey, *dev_pw);
697}
698
699
700struct wpabuf * wps_build_nfc_handover_req(struct wps_context *ctx,
701 struct wpabuf *nfc_dh_pubkey)
702{
703 struct wpabuf *msg;
704 void *len;
705
706 if (ctx == NULL)
707 return NULL;
708
709 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
710 "handover request");
711
712 if (nfc_dh_pubkey == NULL) {
713 wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
714 "configured");
715 return NULL;
716 }
717
718 msg = wpabuf_alloc(1000);
719 if (msg == NULL)
720 return msg;
721 len = wpabuf_put(msg, 2);
722
723 if (wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
724 nfc_dh_pubkey, NULL, 0) ||
725 wps_build_uuid_e(msg, ctx->uuid) ||
726 wps_build_wfa_ext(msg, 0, NULL, 0)) {
727 wpabuf_free(msg);
728 return NULL;
729 }
730
731 WPA_PUT_BE16(len, wpabuf_len(msg) - 2);
732
733 return msg;
734}
735
736
737static int wps_build_ssid(struct wpabuf *msg, struct wps_context *wps)
738{
739 wpa_printf(MSG_DEBUG, "WPS: * SSID");
740 wpa_hexdump_ascii(MSG_DEBUG, "WPS: SSID in Connection Handover Select",
741 wps->ssid, wps->ssid_len);
742 wpabuf_put_be16(msg, ATTR_SSID);
743 wpabuf_put_be16(msg, wps->ssid_len);
744 wpabuf_put_data(msg, wps->ssid, wps->ssid_len);
745 return 0;
746}
747
748
749static int wps_build_ap_freq(struct wpabuf *msg, int freq)
750{
751 enum hostapd_hw_mode mode;
752 u8 channel, rf_band;
753 u16 ap_channel;
754
755 if (freq <= 0)
756 return 0;
757
758 mode = ieee80211_freq_to_chan(freq, &channel);
759 if (mode == NUM_HOSTAPD_MODES)
760 return 0; /* Unknown channel */
761
762 if (mode == HOSTAPD_MODE_IEEE80211G || mode == HOSTAPD_MODE_IEEE80211B)
763 rf_band = WPS_RF_24GHZ;
764 else if (mode == HOSTAPD_MODE_IEEE80211A)
765 rf_band = WPS_RF_50GHZ;
766 else
767 return 0; /* Unknown band */
768 ap_channel = channel;
769
770 if (wps_build_rf_bands_attr(msg, rf_band) ||
771 wps_build_ap_channel(msg, ap_channel))
772 return -1;
773
774 return 0;
775}
776
777
778struct wpabuf * wps_build_nfc_handover_sel(struct wps_context *ctx,
779 struct wpabuf *nfc_dh_pubkey,
780 const u8 *bssid, int freq)
781{
782 struct wpabuf *msg;
783 void *len;
784
785 if (ctx == NULL)
786 return NULL;
787
788 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
789 "handover select");
790
791 if (nfc_dh_pubkey == NULL) {
792 wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
793 "configured");
794 return NULL;
795 }
796
797 msg = wpabuf_alloc(1000);
798 if (msg == NULL)
799 return msg;
800 len = wpabuf_put(msg, 2);
801
802 if (wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
803 nfc_dh_pubkey, NULL, 0) ||
804 wps_build_ssid(msg, ctx) ||
805 wps_build_ap_freq(msg, freq) ||
806 (bssid && wps_build_mac_addr(msg, bssid)) ||
807 wps_build_wfa_ext(msg, 0, NULL, 0)) {
808 wpabuf_free(msg);
809 return NULL;
810 }
811
812 WPA_PUT_BE16(len, wpabuf_len(msg) - 2);
813
814 return msg;
815}
816
817
818struct wpabuf * wps_build_nfc_handover_req_p2p(struct wps_context *ctx,
819 struct wpabuf *nfc_dh_pubkey)
820{
821 struct wpabuf *msg;
822
823 if (ctx == NULL)
824 return NULL;
825
826 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
827 "handover request (P2P)");
828
829 if (nfc_dh_pubkey == NULL) {
830 wpa_printf(MSG_DEBUG, "WPS: No NFC DH Public Key configured");
831 return NULL;
832 }
833
834 msg = wpabuf_alloc(1000);
835 if (msg == NULL)
836 return msg;
837
838 if (wps_build_manufacturer(&ctx->dev, msg) ||
839 wps_build_model_name(&ctx->dev, msg) ||
840 wps_build_model_number(&ctx->dev, msg) ||
841 wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER,
842 nfc_dh_pubkey, NULL, 0) ||
843 wps_build_rf_bands(&ctx->dev, msg, 0) ||
844 wps_build_serial_number(&ctx->dev, msg) ||
845 wps_build_uuid_e(msg, ctx->uuid) ||
846 wps_build_wfa_ext(msg, 0, NULL, 0)) {
847 wpabuf_free(msg);
848 return NULL;
849 }
850
851 return msg;
852}
853
854
855struct wpabuf * wps_build_nfc_handover_sel_p2p(struct wps_context *ctx,
856 int nfc_dev_pw_id,
857 struct wpabuf *nfc_dh_pubkey,
858 struct wpabuf *nfc_dev_pw)
859{
860 struct wpabuf *msg;
861 const u8 *dev_pw;
862 size_t dev_pw_len;
863
864 if (ctx == NULL)
865 return NULL;
866
867 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection "
868 "handover select (P2P)");
869
870 if (nfc_dh_pubkey == NULL ||
871 (nfc_dev_pw_id != DEV_PW_NFC_CONNECTION_HANDOVER &&
872 nfc_dev_pw == NULL)) {
873 wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password "
874 "configured");
875 return NULL;
876 }
877
878 msg = wpabuf_alloc(1000);
879 if (msg == NULL)
880 return msg;
881
882 if (nfc_dev_pw) {
883 dev_pw = wpabuf_head(nfc_dev_pw);
884 dev_pw_len = wpabuf_len(nfc_dev_pw);
885 } else {
886 dev_pw = NULL;
887 dev_pw_len = 0;
888 }
889
890 if (wps_build_manufacturer(&ctx->dev, msg) ||
891 wps_build_model_name(&ctx->dev, msg) ||
892 wps_build_model_number(&ctx->dev, msg) ||
893 wps_build_oob_dev_pw(msg, nfc_dev_pw_id, nfc_dh_pubkey,
894 dev_pw, dev_pw_len) ||
895 wps_build_rf_bands(&ctx->dev, msg, 0) ||
896 wps_build_serial_number(&ctx->dev, msg) ||
897 wps_build_uuid_e(msg, ctx->uuid) ||
898 wps_build_wfa_ext(msg, 0, NULL, 0)) {
899 wpabuf_free(msg);
900 return NULL;
901 }
902
903 return msg;
904}
905
906#endif /* CONFIG_WPS_NFC */