Line data Source code
1 : /*
2 : * IKEv2 common routines for initiator and responder
3 : * Copyright (c) 2007, 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 "crypto/crypto.h"
13 : #include "crypto/md5.h"
14 : #include "crypto/sha1.h"
15 : #include "crypto/random.h"
16 : #include "ikev2_common.h"
17 :
18 :
19 : static struct ikev2_integ_alg ikev2_integ_algs[] = {
20 : { AUTH_HMAC_SHA1_96, 20, 12 },
21 : { AUTH_HMAC_MD5_96, 16, 12 }
22 : };
23 :
24 : #define NUM_INTEG_ALGS ARRAY_SIZE(ikev2_integ_algs)
25 :
26 :
27 : static struct ikev2_prf_alg ikev2_prf_algs[] = {
28 : { PRF_HMAC_SHA1, 20, 20 },
29 : { PRF_HMAC_MD5, 16, 16 }
30 : };
31 :
32 : #define NUM_PRF_ALGS ARRAY_SIZE(ikev2_prf_algs)
33 :
34 :
35 : static struct ikev2_encr_alg ikev2_encr_algs[] = {
36 : { ENCR_AES_CBC, 16, 16 }, /* only 128-bit keys supported for now */
37 : { ENCR_3DES, 24, 8 }
38 : };
39 :
40 : #define NUM_ENCR_ALGS ARRAY_SIZE(ikev2_encr_algs)
41 :
42 :
43 132 : const struct ikev2_integ_alg * ikev2_get_integ(int id)
44 : {
45 : size_t i;
46 :
47 155 : for (i = 0; i < NUM_INTEG_ALGS; i++) {
48 154 : if (ikev2_integ_algs[i].id == id)
49 131 : return &ikev2_integ_algs[i];
50 : }
51 :
52 1 : return NULL;
53 : }
54 :
55 :
56 87 : int ikev2_integ_hash(int alg, const u8 *key, size_t key_len, const u8 *data,
57 : size_t data_len, u8 *hash)
58 : {
59 : u8 tmphash[IKEV2_MAX_HASH_LEN];
60 :
61 87 : switch (alg) {
62 : case AUTH_HMAC_SHA1_96:
63 82 : if (key_len != 20)
64 0 : return -1;
65 82 : hmac_sha1(key, key_len, data, data_len, tmphash);
66 82 : os_memcpy(hash, tmphash, 12);
67 82 : break;
68 : case AUTH_HMAC_MD5_96:
69 5 : if (key_len != 16)
70 0 : return -1;
71 5 : hmac_md5(key, key_len, data, data_len, tmphash);
72 5 : os_memcpy(hash, tmphash, 12);
73 5 : break;
74 : default:
75 0 : return -1;
76 : }
77 :
78 87 : return 0;
79 : }
80 :
81 :
82 125 : const struct ikev2_prf_alg * ikev2_get_prf(int id)
83 : {
84 : size_t i;
85 :
86 144 : for (i = 0; i < NUM_PRF_ALGS; i++) {
87 144 : if (ikev2_prf_algs[i].id == id)
88 125 : return &ikev2_prf_algs[i];
89 : }
90 :
91 0 : return NULL;
92 : }
93 :
94 :
95 310 : int ikev2_prf_hash(int alg, const u8 *key, size_t key_len,
96 : size_t num_elem, const u8 *addr[], const size_t *len,
97 : u8 *hash)
98 : {
99 310 : switch (alg) {
100 : case PRF_HMAC_SHA1:
101 274 : hmac_sha1_vector(key, key_len, num_elem, addr, len, hash);
102 274 : break;
103 : case PRF_HMAC_MD5:
104 36 : hmac_md5_vector(key, key_len, num_elem, addr, len, hash);
105 36 : break;
106 : default:
107 0 : return -1;
108 : }
109 :
110 310 : return 0;
111 : }
112 :
113 :
114 30 : int ikev2_prf_plus(int alg, const u8 *key, size_t key_len,
115 : const u8 *data, size_t data_len,
116 : u8 *out, size_t out_len)
117 : {
118 : u8 hash[IKEV2_MAX_HASH_LEN];
119 : size_t hash_len;
120 : u8 iter, *pos, *end;
121 : const u8 *addr[3];
122 : size_t len[3];
123 : const struct ikev2_prf_alg *prf;
124 : int res;
125 :
126 30 : prf = ikev2_get_prf(alg);
127 30 : if (prf == NULL)
128 0 : return -1;
129 30 : hash_len = prf->hash_len;
130 :
131 30 : addr[0] = hash;
132 30 : len[0] = hash_len;
133 30 : addr[1] = data;
134 30 : len[1] = data_len;
135 30 : addr[2] = &iter;
136 30 : len[2] = 1;
137 :
138 30 : pos = out;
139 30 : end = out + out_len;
140 30 : iter = 1;
141 274 : while (pos < end) {
142 : size_t clen;
143 214 : if (iter == 1)
144 30 : res = ikev2_prf_hash(alg, key, key_len, 2, &addr[1],
145 : &len[1], hash);
146 : else
147 184 : res = ikev2_prf_hash(alg, key, key_len, 3, addr, len,
148 : hash);
149 214 : if (res < 0)
150 0 : return -1;
151 214 : clen = hash_len;
152 214 : if ((int) clen > end - pos)
153 26 : clen = end - pos;
154 214 : os_memcpy(pos, hash, clen);
155 214 : pos += clen;
156 214 : iter++;
157 : }
158 :
159 30 : return 0;
160 : }
161 :
162 :
163 92 : const struct ikev2_encr_alg * ikev2_get_encr(int id)
164 : {
165 : size_t i;
166 :
167 111 : for (i = 0; i < NUM_ENCR_ALGS; i++) {
168 111 : if (ikev2_encr_algs[i].id == id)
169 92 : return &ikev2_encr_algs[i];
170 : }
171 :
172 0 : return NULL;
173 : }
174 :
175 :
176 25 : int ikev2_encr_encrypt(int alg, const u8 *key, size_t key_len, const u8 *iv,
177 : const u8 *plain, u8 *crypt, size_t len)
178 : {
179 : struct crypto_cipher *cipher;
180 : int encr_alg;
181 :
182 25 : switch (alg) {
183 : case ENCR_3DES:
184 4 : encr_alg = CRYPTO_CIPHER_ALG_3DES;
185 4 : break;
186 : case ENCR_AES_CBC:
187 21 : encr_alg = CRYPTO_CIPHER_ALG_AES;
188 21 : break;
189 : default:
190 0 : wpa_printf(MSG_DEBUG, "IKEV2: Unsupported encr alg %d", alg);
191 0 : return -1;
192 : }
193 :
194 25 : cipher = crypto_cipher_init(encr_alg, iv, key, key_len);
195 25 : if (cipher == NULL) {
196 0 : wpa_printf(MSG_INFO, "IKEV2: Failed to initialize cipher");
197 0 : return -1;
198 : }
199 :
200 25 : if (crypto_cipher_encrypt(cipher, plain, crypt, len) < 0) {
201 0 : wpa_printf(MSG_INFO, "IKEV2: Encryption failed");
202 0 : crypto_cipher_deinit(cipher);
203 0 : return -1;
204 : }
205 25 : crypto_cipher_deinit(cipher);
206 :
207 25 : return 0;
208 : }
209 :
210 :
211 21 : int ikev2_encr_decrypt(int alg, const u8 *key, size_t key_len, const u8 *iv,
212 : const u8 *crypt, u8 *plain, size_t len)
213 : {
214 : struct crypto_cipher *cipher;
215 : int encr_alg;
216 :
217 21 : switch (alg) {
218 : case ENCR_3DES:
219 0 : encr_alg = CRYPTO_CIPHER_ALG_3DES;
220 0 : break;
221 : case ENCR_AES_CBC:
222 21 : encr_alg = CRYPTO_CIPHER_ALG_AES;
223 21 : break;
224 : default:
225 0 : wpa_printf(MSG_DEBUG, "IKEV2: Unsupported encr alg %d", alg);
226 0 : return -1;
227 : }
228 :
229 21 : cipher = crypto_cipher_init(encr_alg, iv, key, key_len);
230 21 : if (cipher == NULL) {
231 0 : wpa_printf(MSG_INFO, "IKEV2: Failed to initialize cipher");
232 0 : return -1;
233 : }
234 :
235 21 : if (crypto_cipher_decrypt(cipher, crypt, plain, len) < 0) {
236 0 : wpa_printf(MSG_INFO, "IKEV2: Decryption failed");
237 0 : crypto_cipher_deinit(cipher);
238 0 : return -1;
239 : }
240 21 : crypto_cipher_deinit(cipher);
241 :
242 21 : return 0;
243 : }
244 :
245 :
246 82 : int ikev2_parse_payloads(struct ikev2_payloads *payloads,
247 : u8 next_payload, const u8 *pos, const u8 *end)
248 : {
249 : const struct ikev2_payload_hdr *phdr;
250 :
251 82 : os_memset(payloads, 0, sizeof(*payloads));
252 :
253 306 : while (next_payload != IKEV2_PAYLOAD_NO_NEXT_PAYLOAD) {
254 : unsigned int plen, pdatalen, left;
255 : const u8 *pdata;
256 146 : wpa_printf(MSG_DEBUG, "IKEV2: Processing payload %u",
257 : next_payload);
258 146 : if (end < pos)
259 0 : return -1;
260 146 : left = end - pos;
261 146 : if (left < sizeof(*phdr)) {
262 1 : wpa_printf(MSG_INFO, "IKEV2: Too short message for "
263 : "payload header (left=%ld)",
264 : (long) (end - pos));
265 1 : return -1;
266 : }
267 145 : phdr = (const struct ikev2_payload_hdr *) pos;
268 145 : plen = WPA_GET_BE16(phdr->payload_length);
269 145 : if (plen < sizeof(*phdr) || plen > left) {
270 2 : wpa_printf(MSG_INFO, "IKEV2: Invalid payload header "
271 : "length %d", plen);
272 2 : return -1;
273 : }
274 :
275 286 : wpa_printf(MSG_DEBUG, "IKEV2: Next Payload: %u Flags: 0x%x"
276 : " Payload Length: %u",
277 286 : phdr->next_payload, phdr->flags, plen);
278 :
279 143 : pdata = (const u8 *) (phdr + 1);
280 143 : pdatalen = plen - sizeof(*phdr);
281 :
282 143 : switch (next_payload) {
283 : case IKEV2_PAYLOAD_SA:
284 41 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Security "
285 : "Association");
286 41 : payloads->sa = pdata;
287 41 : payloads->sa_len = pdatalen;
288 41 : break;
289 : case IKEV2_PAYLOAD_KEY_EXCHANGE:
290 24 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Key "
291 : "Exchange");
292 24 : payloads->ke = pdata;
293 24 : payloads->ke_len = pdatalen;
294 24 : break;
295 : case IKEV2_PAYLOAD_IDi:
296 7 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: IDi");
297 7 : payloads->idi = pdata;
298 7 : payloads->idi_len = pdatalen;
299 7 : break;
300 : case IKEV2_PAYLOAD_IDr:
301 13 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: IDr");
302 13 : payloads->idr = pdata;
303 13 : payloads->idr_len = pdatalen;
304 13 : break;
305 : case IKEV2_PAYLOAD_CERTIFICATE:
306 1 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Certificate");
307 1 : payloads->cert = pdata;
308 1 : payloads->cert_len = pdatalen;
309 1 : break;
310 : case IKEV2_PAYLOAD_AUTHENTICATION:
311 13 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: "
312 : "Authentication");
313 13 : payloads->auth = pdata;
314 13 : payloads->auth_len = pdatalen;
315 13 : break;
316 : case IKEV2_PAYLOAD_NONCE:
317 20 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Nonce");
318 20 : payloads->nonce = pdata;
319 20 : payloads->nonce_len = pdatalen;
320 20 : break;
321 : case IKEV2_PAYLOAD_ENCRYPTED:
322 21 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Encrypted");
323 21 : payloads->encrypted = pdata;
324 21 : payloads->encrypted_len = pdatalen;
325 21 : break;
326 : case IKEV2_PAYLOAD_NOTIFICATION:
327 1 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: "
328 : "Notification");
329 1 : payloads->notification = pdata;
330 1 : payloads->notification_len = pdatalen;
331 1 : break;
332 : default:
333 2 : if (phdr->flags & IKEV2_PAYLOAD_FLAGS_CRITICAL) {
334 1 : wpa_printf(MSG_INFO, "IKEV2: Unsupported "
335 : "critical payload %u - reject the "
336 : "entire message", next_payload);
337 1 : return -1;
338 : } else {
339 1 : wpa_printf(MSG_DEBUG, "IKEV2: Skipped "
340 : "unsupported payload %u",
341 : next_payload);
342 : }
343 : }
344 :
345 163 : if (next_payload == IKEV2_PAYLOAD_ENCRYPTED &&
346 21 : pos + plen == end) {
347 : /*
348 : * Next Payload in the case of Encrypted Payload is
349 : * actually the payload type for the first embedded
350 : * payload.
351 : */
352 21 : payloads->encr_next_payload = phdr->next_payload;
353 21 : next_payload = IKEV2_PAYLOAD_NO_NEXT_PAYLOAD;
354 : } else
355 121 : next_payload = phdr->next_payload;
356 :
357 142 : pos += plen;
358 : }
359 :
360 78 : if (pos != end) {
361 1 : wpa_printf(MSG_INFO, "IKEV2: Unexpected extra data after "
362 : "payloads");
363 1 : return -1;
364 : }
365 :
366 77 : return 0;
367 : }
368 :
369 :
370 26 : int ikev2_derive_auth_data(int prf_alg, const struct wpabuf *sign_msg,
371 : const u8 *ID, size_t ID_len, u8 ID_type,
372 : struct ikev2_keys *keys, int initiator,
373 : const u8 *shared_secret, size_t shared_secret_len,
374 : const u8 *nonce, size_t nonce_len,
375 : const u8 *key_pad, size_t key_pad_len,
376 : u8 *auth_data)
377 : {
378 : size_t sign_len, buf_len;
379 : u8 *sign_data, *pos, *buf, hash[IKEV2_MAX_HASH_LEN];
380 : const struct ikev2_prf_alg *prf;
381 26 : const u8 *SK_p = initiator ? keys->SK_pi : keys->SK_pr;
382 :
383 26 : prf = ikev2_get_prf(prf_alg);
384 26 : if (sign_msg == NULL || ID == NULL || SK_p == NULL ||
385 26 : shared_secret == NULL || nonce == NULL || prf == NULL)
386 0 : return -1;
387 :
388 : /* prf(SK_pi/r,IDi/r') */
389 26 : buf_len = 4 + ID_len;
390 26 : buf = os_zalloc(buf_len);
391 26 : if (buf == NULL)
392 0 : return -1;
393 26 : buf[0] = ID_type;
394 26 : os_memcpy(buf + 4, ID, ID_len);
395 26 : if (ikev2_prf_hash(prf->id, SK_p, keys->SK_prf_len,
396 : 1, (const u8 **) &buf, &buf_len, hash) < 0) {
397 0 : os_free(buf);
398 0 : return -1;
399 : }
400 26 : os_free(buf);
401 :
402 : /* sign_data = msg | Nr/i | prf(SK_pi/r,IDi/r') */
403 26 : sign_len = wpabuf_len(sign_msg) + nonce_len + prf->hash_len;
404 26 : sign_data = os_malloc(sign_len);
405 26 : if (sign_data == NULL)
406 0 : return -1;
407 26 : pos = sign_data;
408 26 : os_memcpy(pos, wpabuf_head(sign_msg), wpabuf_len(sign_msg));
409 26 : pos += wpabuf_len(sign_msg);
410 26 : os_memcpy(pos, nonce, nonce_len);
411 26 : pos += nonce_len;
412 26 : os_memcpy(pos, hash, prf->hash_len);
413 :
414 : /* AUTH = prf(prf(Shared Secret, key pad, sign_data) */
415 26 : if (ikev2_prf_hash(prf->id, shared_secret, shared_secret_len, 1,
416 26 : &key_pad, &key_pad_len, hash) < 0 ||
417 26 : ikev2_prf_hash(prf->id, hash, prf->hash_len, 1,
418 : (const u8 **) &sign_data, &sign_len, auth_data) < 0)
419 : {
420 0 : os_free(sign_data);
421 0 : return -1;
422 : }
423 26 : os_free(sign_data);
424 :
425 26 : return 0;
426 : }
427 :
428 :
429 21 : u8 * ikev2_decrypt_payload(int encr_id, int integ_id,
430 : struct ikev2_keys *keys, int initiator,
431 : const struct ikev2_hdr *hdr,
432 : const u8 *encrypted, size_t encrypted_len,
433 : size_t *res_len)
434 : {
435 : size_t iv_len;
436 : const u8 *pos, *end, *iv, *integ;
437 : u8 hash[IKEV2_MAX_HASH_LEN], *decrypted;
438 : size_t decrypted_len, pad_len;
439 : const struct ikev2_integ_alg *integ_alg;
440 : const struct ikev2_encr_alg *encr_alg;
441 21 : const u8 *SK_e = initiator ? keys->SK_ei : keys->SK_er;
442 21 : const u8 *SK_a = initiator ? keys->SK_ai : keys->SK_ar;
443 :
444 21 : if (encrypted == NULL) {
445 0 : wpa_printf(MSG_INFO, "IKEV2: No Encrypted payload in SA_AUTH");
446 0 : return NULL;
447 : }
448 :
449 21 : encr_alg = ikev2_get_encr(encr_id);
450 21 : if (encr_alg == NULL) {
451 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported encryption type");
452 0 : return NULL;
453 : }
454 21 : iv_len = encr_alg->block_size;
455 :
456 21 : integ_alg = ikev2_get_integ(integ_id);
457 21 : if (integ_alg == NULL) {
458 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported intergrity type");
459 0 : return NULL;
460 : }
461 :
462 21 : if (encrypted_len < iv_len + 1 + integ_alg->hash_len) {
463 0 : wpa_printf(MSG_INFO, "IKEV2: No room for IV or Integrity "
464 : "Checksum");
465 0 : return NULL;
466 : }
467 :
468 21 : iv = encrypted;
469 21 : pos = iv + iv_len;
470 21 : end = encrypted + encrypted_len;
471 21 : integ = end - integ_alg->hash_len;
472 :
473 21 : if (SK_a == NULL) {
474 0 : wpa_printf(MSG_INFO, "IKEV2: No SK_a available");
475 0 : return NULL;
476 : }
477 21 : if (ikev2_integ_hash(integ_id, SK_a, keys->SK_integ_len,
478 : (const u8 *) hdr,
479 21 : integ - (const u8 *) hdr, hash) < 0) {
480 0 : wpa_printf(MSG_INFO, "IKEV2: Failed to calculate integrity "
481 : "hash");
482 0 : return NULL;
483 : }
484 21 : if (os_memcmp_const(integ, hash, integ_alg->hash_len) != 0) {
485 0 : wpa_printf(MSG_INFO, "IKEV2: Incorrect Integrity Checksum "
486 : "Data");
487 0 : return NULL;
488 : }
489 :
490 21 : if (SK_e == NULL) {
491 0 : wpa_printf(MSG_INFO, "IKEV2: No SK_e available");
492 0 : return NULL;
493 : }
494 :
495 21 : decrypted_len = integ - pos;
496 21 : decrypted = os_malloc(decrypted_len);
497 21 : if (decrypted == NULL)
498 0 : return NULL;
499 :
500 21 : if (ikev2_encr_decrypt(encr_alg->id, SK_e, keys->SK_encr_len, iv, pos,
501 : decrypted, decrypted_len) < 0) {
502 0 : os_free(decrypted);
503 0 : return NULL;
504 : }
505 :
506 21 : pad_len = decrypted[decrypted_len - 1];
507 21 : if (decrypted_len < pad_len + 1) {
508 0 : wpa_printf(MSG_INFO, "IKEV2: Invalid padding in encrypted "
509 : "payload");
510 0 : os_free(decrypted);
511 0 : return NULL;
512 : }
513 :
514 21 : decrypted_len -= pad_len + 1;
515 :
516 21 : *res_len = decrypted_len;
517 21 : return decrypted;
518 : }
519 :
520 :
521 45 : void ikev2_update_hdr(struct wpabuf *msg)
522 : {
523 : struct ikev2_hdr *hdr;
524 :
525 : /* Update lenth field in HDR */
526 45 : hdr = wpabuf_mhead(msg);
527 45 : WPA_PUT_BE32(hdr->length, wpabuf_len(msg));
528 45 : }
529 :
530 :
531 25 : int ikev2_build_encrypted(int encr_id, int integ_id, struct ikev2_keys *keys,
532 : int initiator, struct wpabuf *msg,
533 : struct wpabuf *plain, u8 next_payload)
534 : {
535 : struct ikev2_payload_hdr *phdr;
536 : size_t plen;
537 : size_t iv_len, pad_len;
538 : u8 *icv, *iv;
539 : const struct ikev2_integ_alg *integ_alg;
540 : const struct ikev2_encr_alg *encr_alg;
541 25 : const u8 *SK_e = initiator ? keys->SK_ei : keys->SK_er;
542 25 : const u8 *SK_a = initiator ? keys->SK_ai : keys->SK_ar;
543 :
544 25 : wpa_printf(MSG_DEBUG, "IKEV2: Adding Encrypted payload");
545 :
546 : /* Encr - RFC 4306, Sect. 3.14 */
547 :
548 25 : encr_alg = ikev2_get_encr(encr_id);
549 25 : if (encr_alg == NULL) {
550 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported encryption type");
551 0 : return -1;
552 : }
553 25 : iv_len = encr_alg->block_size;
554 :
555 25 : integ_alg = ikev2_get_integ(integ_id);
556 25 : if (integ_alg == NULL) {
557 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported intergrity type");
558 0 : return -1;
559 : }
560 :
561 25 : if (SK_e == NULL) {
562 0 : wpa_printf(MSG_INFO, "IKEV2: No SK_e available");
563 0 : return -1;
564 : }
565 :
566 25 : if (SK_a == NULL) {
567 0 : wpa_printf(MSG_INFO, "IKEV2: No SK_a available");
568 0 : return -1;
569 : }
570 :
571 25 : phdr = wpabuf_put(msg, sizeof(*phdr));
572 25 : phdr->next_payload = next_payload;
573 25 : phdr->flags = 0;
574 :
575 25 : iv = wpabuf_put(msg, iv_len);
576 25 : if (random_get_bytes(iv, iv_len)) {
577 0 : wpa_printf(MSG_INFO, "IKEV2: Could not generate IV");
578 0 : return -1;
579 : }
580 :
581 25 : pad_len = iv_len - (wpabuf_len(plain) + 1) % iv_len;
582 25 : if (pad_len == iv_len)
583 0 : pad_len = 0;
584 25 : wpabuf_put(plain, pad_len);
585 25 : wpabuf_put_u8(plain, pad_len);
586 :
587 50 : if (ikev2_encr_encrypt(encr_alg->id, SK_e, keys->SK_encr_len, iv,
588 25 : wpabuf_head(plain), wpabuf_mhead(plain),
589 : wpabuf_len(plain)) < 0)
590 0 : return -1;
591 :
592 25 : wpabuf_put_buf(msg, plain);
593 :
594 : /* Need to update all headers (Length fields) prior to hash func */
595 25 : icv = wpabuf_put(msg, integ_alg->hash_len);
596 25 : plen = (u8 *) wpabuf_put(msg, 0) - (u8 *) phdr;
597 25 : WPA_PUT_BE16(phdr->payload_length, plen);
598 :
599 25 : ikev2_update_hdr(msg);
600 :
601 50 : return ikev2_integ_hash(integ_id, SK_a, keys->SK_integ_len,
602 25 : wpabuf_head(msg),
603 25 : wpabuf_len(msg) - integ_alg->hash_len, icv);
604 :
605 : return 0;
606 : }
607 :
608 :
609 18 : int ikev2_keys_set(struct ikev2_keys *keys)
610 : {
611 72 : return keys->SK_d && keys->SK_ai && keys->SK_ar && keys->SK_ei &&
612 54 : keys->SK_er && keys->SK_pi && keys->SK_pr;
613 : }
614 :
615 :
616 81 : void ikev2_free_keys(struct ikev2_keys *keys)
617 : {
618 81 : os_free(keys->SK_d);
619 81 : os_free(keys->SK_ai);
620 81 : os_free(keys->SK_ar);
621 81 : os_free(keys->SK_ei);
622 81 : os_free(keys->SK_er);
623 81 : os_free(keys->SK_pi);
624 81 : os_free(keys->SK_pr);
625 81 : keys->SK_d = keys->SK_ai = keys->SK_ar = keys->SK_ei = keys->SK_er =
626 81 : keys->SK_pi = keys->SK_pr = NULL;
627 81 : }
628 :
629 :
630 18 : int ikev2_derive_sk_keys(const struct ikev2_prf_alg *prf,
631 : const struct ikev2_integ_alg *integ,
632 : const struct ikev2_encr_alg *encr,
633 : const u8 *skeyseed, const u8 *data, size_t data_len,
634 : struct ikev2_keys *keys)
635 : {
636 : u8 *keybuf, *pos;
637 : size_t keybuf_len;
638 :
639 : /*
640 : * {SK_d | SK_ai | SK_ar | SK_ei | SK_er | SK_pi | SK_pr } =
641 : * prf+(SKEYSEED, Ni | Nr | SPIi | SPIr )
642 : */
643 18 : ikev2_free_keys(keys);
644 18 : keys->SK_d_len = prf->key_len;
645 18 : keys->SK_integ_len = integ->key_len;
646 18 : keys->SK_encr_len = encr->key_len;
647 18 : keys->SK_prf_len = prf->key_len;
648 :
649 54 : keybuf_len = keys->SK_d_len + 2 * keys->SK_integ_len +
650 36 : 2 * keys->SK_encr_len + 2 * keys->SK_prf_len;
651 18 : keybuf = os_malloc(keybuf_len);
652 18 : if (keybuf == NULL)
653 0 : return -1;
654 :
655 18 : if (ikev2_prf_plus(prf->id, skeyseed, prf->hash_len,
656 : data, data_len, keybuf, keybuf_len)) {
657 0 : os_free(keybuf);
658 0 : return -1;
659 : }
660 :
661 18 : pos = keybuf;
662 :
663 18 : keys->SK_d = os_malloc(keys->SK_d_len);
664 18 : if (keys->SK_d) {
665 18 : os_memcpy(keys->SK_d, pos, keys->SK_d_len);
666 36 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_d",
667 18 : keys->SK_d, keys->SK_d_len);
668 : }
669 18 : pos += keys->SK_d_len;
670 :
671 18 : keys->SK_ai = os_malloc(keys->SK_integ_len);
672 18 : if (keys->SK_ai) {
673 18 : os_memcpy(keys->SK_ai, pos, keys->SK_integ_len);
674 36 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ai",
675 18 : keys->SK_ai, keys->SK_integ_len);
676 : }
677 18 : pos += keys->SK_integ_len;
678 :
679 18 : keys->SK_ar = os_malloc(keys->SK_integ_len);
680 18 : if (keys->SK_ar) {
681 18 : os_memcpy(keys->SK_ar, pos, keys->SK_integ_len);
682 36 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ar",
683 18 : keys->SK_ar, keys->SK_integ_len);
684 : }
685 18 : pos += keys->SK_integ_len;
686 :
687 18 : keys->SK_ei = os_malloc(keys->SK_encr_len);
688 18 : if (keys->SK_ei) {
689 18 : os_memcpy(keys->SK_ei, pos, keys->SK_encr_len);
690 36 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ei",
691 18 : keys->SK_ei, keys->SK_encr_len);
692 : }
693 18 : pos += keys->SK_encr_len;
694 :
695 18 : keys->SK_er = os_malloc(keys->SK_encr_len);
696 18 : if (keys->SK_er) {
697 18 : os_memcpy(keys->SK_er, pos, keys->SK_encr_len);
698 36 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_er",
699 18 : keys->SK_er, keys->SK_encr_len);
700 : }
701 18 : pos += keys->SK_encr_len;
702 :
703 18 : keys->SK_pi = os_malloc(keys->SK_prf_len);
704 18 : if (keys->SK_pi) {
705 18 : os_memcpy(keys->SK_pi, pos, keys->SK_prf_len);
706 36 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_pi",
707 18 : keys->SK_pi, keys->SK_prf_len);
708 : }
709 18 : pos += keys->SK_prf_len;
710 :
711 18 : keys->SK_pr = os_malloc(keys->SK_prf_len);
712 18 : if (keys->SK_pr) {
713 18 : os_memcpy(keys->SK_pr, pos, keys->SK_prf_len);
714 36 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_pr",
715 18 : keys->SK_pr, keys->SK_prf_len);
716 : }
717 :
718 18 : os_free(keybuf);
719 :
720 18 : if (!ikev2_keys_set(keys)) {
721 0 : ikev2_free_keys(keys);
722 0 : return -1;
723 : }
724 :
725 18 : return 0;
726 : }
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