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 18 : const struct ikev2_integ_alg * ikev2_get_integ(int id)
44 : {
45 : size_t i;
46 :
47 18 : for (i = 0; i < NUM_INTEG_ALGS; i++) {
48 18 : if (ikev2_integ_algs[i].id == id)
49 18 : return &ikev2_integ_algs[i];
50 : }
51 :
52 0 : return NULL;
53 : }
54 :
55 :
56 14 : 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 14 : switch (alg) {
62 : case AUTH_HMAC_SHA1_96:
63 14 : if (key_len != 20)
64 0 : return -1;
65 14 : hmac_sha1(key, key_len, data, data_len, tmphash);
66 14 : os_memcpy(hash, tmphash, 12);
67 14 : break;
68 : case AUTH_HMAC_MD5_96:
69 0 : if (key_len != 16)
70 0 : return -1;
71 0 : hmac_md5(key, key_len, data, data_len, tmphash);
72 0 : os_memcpy(hash, tmphash, 12);
73 0 : break;
74 : default:
75 0 : return -1;
76 : }
77 :
78 14 : return 0;
79 : }
80 :
81 :
82 16 : const struct ikev2_prf_alg * ikev2_get_prf(int id)
83 : {
84 : size_t i;
85 :
86 16 : for (i = 0; i < NUM_PRF_ALGS; i++) {
87 16 : if (ikev2_prf_algs[i].id == id)
88 16 : return &ikev2_prf_algs[i];
89 : }
90 :
91 0 : return NULL;
92 : }
93 :
94 :
95 42 : 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 42 : switch (alg) {
100 : case PRF_HMAC_SHA1:
101 42 : hmac_sha1_vector(key, key_len, num_elem, addr, len, hash);
102 42 : break;
103 : case PRF_HMAC_MD5:
104 0 : hmac_md5_vector(key, key_len, num_elem, addr, len, hash);
105 0 : break;
106 : default:
107 0 : return -1;
108 : }
109 :
110 42 : return 0;
111 : }
112 :
113 :
114 4 : 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 4 : prf = ikev2_get_prf(alg);
127 4 : if (prf == NULL)
128 0 : return -1;
129 4 : hash_len = prf->hash_len;
130 :
131 4 : addr[0] = hash;
132 4 : len[0] = hash_len;
133 4 : addr[1] = data;
134 4 : len[1] = data_len;
135 4 : addr[2] = &iter;
136 4 : len[2] = 1;
137 :
138 4 : pos = out;
139 4 : end = out + out_len;
140 4 : iter = 1;
141 36 : while (pos < end) {
142 : size_t clen;
143 28 : if (iter == 1)
144 4 : res = ikev2_prf_hash(alg, key, key_len, 2, &addr[1],
145 : &len[1], hash);
146 : else
147 24 : res = ikev2_prf_hash(alg, key, key_len, 3, addr, len,
148 : hash);
149 28 : if (res < 0)
150 0 : return -1;
151 28 : clen = hash_len;
152 28 : if ((int) clen > end - pos)
153 4 : clen = end - pos;
154 28 : os_memcpy(pos, hash, clen);
155 28 : pos += clen;
156 28 : iter++;
157 : }
158 :
159 4 : return 0;
160 : }
161 :
162 :
163 10 : const struct ikev2_encr_alg * ikev2_get_encr(int id)
164 : {
165 : size_t i;
166 :
167 10 : for (i = 0; i < NUM_ENCR_ALGS; i++) {
168 10 : if (ikev2_encr_algs[i].id == id)
169 10 : return &ikev2_encr_algs[i];
170 : }
171 :
172 0 : return NULL;
173 : }
174 :
175 :
176 2 : 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 2 : switch (alg) {
183 : case ENCR_3DES:
184 0 : encr_alg = CRYPTO_CIPHER_ALG_3DES;
185 0 : break;
186 : case ENCR_AES_CBC:
187 2 : encr_alg = CRYPTO_CIPHER_ALG_AES;
188 2 : break;
189 : default:
190 0 : wpa_printf(MSG_DEBUG, "IKEV2: Unsupported encr alg %d", alg);
191 0 : return -1;
192 : }
193 :
194 2 : cipher = crypto_cipher_init(encr_alg, iv, key, key_len);
195 2 : if (cipher == NULL) {
196 0 : wpa_printf(MSG_INFO, "IKEV2: Failed to initialize cipher");
197 0 : return -1;
198 : }
199 :
200 2 : 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 2 : crypto_cipher_deinit(cipher);
206 :
207 2 : return 0;
208 : }
209 :
210 :
211 4 : 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 4 : switch (alg) {
218 : case ENCR_3DES:
219 0 : encr_alg = CRYPTO_CIPHER_ALG_3DES;
220 0 : break;
221 : case ENCR_AES_CBC:
222 4 : encr_alg = CRYPTO_CIPHER_ALG_AES;
223 4 : break;
224 : default:
225 0 : wpa_printf(MSG_DEBUG, "IKEV2: Unsupported encr alg %d", alg);
226 0 : return -1;
227 : }
228 :
229 4 : cipher = crypto_cipher_init(encr_alg, iv, key, key_len);
230 4 : if (cipher == NULL) {
231 0 : wpa_printf(MSG_INFO, "IKEV2: Failed to initialize cipher");
232 0 : return -1;
233 : }
234 :
235 4 : 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 4 : crypto_cipher_deinit(cipher);
241 :
242 4 : return 0;
243 : }
244 :
245 :
246 8 : 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 8 : os_memset(payloads, 0, sizeof(*payloads));
252 :
253 32 : while (next_payload != IKEV2_PAYLOAD_NO_NEXT_PAYLOAD) {
254 : int plen, pdatalen;
255 : const u8 *pdata;
256 16 : wpa_printf(MSG_DEBUG, "IKEV2: Processing payload %u",
257 : next_payload);
258 16 : if (end - pos < (int) sizeof(*phdr)) {
259 0 : wpa_printf(MSG_INFO, "IKEV2: Too short message for "
260 : "payload header (left=%ld)",
261 : (long) (end - pos));
262 : }
263 16 : phdr = (const struct ikev2_payload_hdr *) pos;
264 16 : plen = WPA_GET_BE16(phdr->payload_length);
265 16 : if (plen < (int) sizeof(*phdr) || pos + plen > end) {
266 0 : wpa_printf(MSG_INFO, "IKEV2: Invalid payload header "
267 : "length %d", plen);
268 0 : return -1;
269 : }
270 :
271 32 : wpa_printf(MSG_DEBUG, "IKEV2: Next Payload: %u Flags: 0x%x"
272 : " Payload Length: %d",
273 32 : phdr->next_payload, phdr->flags, plen);
274 :
275 16 : pdata = (const u8 *) (phdr + 1);
276 16 : pdatalen = plen - sizeof(*phdr);
277 :
278 16 : switch (next_payload) {
279 : case IKEV2_PAYLOAD_SA:
280 2 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Security "
281 : "Association");
282 2 : payloads->sa = pdata;
283 2 : payloads->sa_len = pdatalen;
284 2 : break;
285 : case IKEV2_PAYLOAD_KEY_EXCHANGE:
286 2 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Key "
287 : "Exchange");
288 2 : payloads->ke = pdata;
289 2 : payloads->ke_len = pdatalen;
290 2 : break;
291 : case IKEV2_PAYLOAD_IDi:
292 0 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: IDi");
293 0 : payloads->idi = pdata;
294 0 : payloads->idi_len = pdatalen;
295 0 : break;
296 : case IKEV2_PAYLOAD_IDr:
297 4 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: IDr");
298 4 : payloads->idr = pdata;
299 4 : payloads->idr_len = pdatalen;
300 4 : break;
301 : case IKEV2_PAYLOAD_CERTIFICATE:
302 0 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Certificate");
303 0 : payloads->cert = pdata;
304 0 : payloads->cert_len = pdatalen;
305 0 : break;
306 : case IKEV2_PAYLOAD_AUTHENTICATION:
307 2 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: "
308 : "Authentication");
309 2 : payloads->auth = pdata;
310 2 : payloads->auth_len = pdatalen;
311 2 : break;
312 : case IKEV2_PAYLOAD_NONCE:
313 2 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Nonce");
314 2 : payloads->nonce = pdata;
315 2 : payloads->nonce_len = pdatalen;
316 2 : break;
317 : case IKEV2_PAYLOAD_ENCRYPTED:
318 4 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Encrypted");
319 4 : payloads->encrypted = pdata;
320 4 : payloads->encrypted_len = pdatalen;
321 4 : break;
322 : case IKEV2_PAYLOAD_NOTIFICATION:
323 0 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: "
324 : "Notification");
325 0 : payloads->notification = pdata;
326 0 : payloads->notification_len = pdatalen;
327 0 : break;
328 : default:
329 0 : if (phdr->flags & IKEV2_PAYLOAD_FLAGS_CRITICAL) {
330 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported "
331 : "critical payload %u - reject the "
332 : "entire message", next_payload);
333 0 : return -1;
334 : } else {
335 0 : wpa_printf(MSG_DEBUG, "IKEV2: Skipped "
336 : "unsupported payload %u",
337 : next_payload);
338 : }
339 : }
340 :
341 20 : if (next_payload == IKEV2_PAYLOAD_ENCRYPTED &&
342 4 : pos + plen == end) {
343 : /*
344 : * Next Payload in the case of Encrypted Payload is
345 : * actually the payload type for the first embedded
346 : * payload.
347 : */
348 4 : payloads->encr_next_payload = phdr->next_payload;
349 4 : next_payload = IKEV2_PAYLOAD_NO_NEXT_PAYLOAD;
350 : } else
351 12 : next_payload = phdr->next_payload;
352 :
353 16 : pos += plen;
354 : }
355 :
356 8 : if (pos != end) {
357 0 : wpa_printf(MSG_INFO, "IKEV2: Unexpected extra data after "
358 : "payloads");
359 0 : return -1;
360 : }
361 :
362 8 : return 0;
363 : }
364 :
365 :
366 4 : int ikev2_derive_auth_data(int prf_alg, const struct wpabuf *sign_msg,
367 : const u8 *ID, size_t ID_len, u8 ID_type,
368 : struct ikev2_keys *keys, int initiator,
369 : const u8 *shared_secret, size_t shared_secret_len,
370 : const u8 *nonce, size_t nonce_len,
371 : const u8 *key_pad, size_t key_pad_len,
372 : u8 *auth_data)
373 : {
374 : size_t sign_len, buf_len;
375 : u8 *sign_data, *pos, *buf, hash[IKEV2_MAX_HASH_LEN];
376 : const struct ikev2_prf_alg *prf;
377 4 : const u8 *SK_p = initiator ? keys->SK_pi : keys->SK_pr;
378 :
379 4 : prf = ikev2_get_prf(prf_alg);
380 4 : if (sign_msg == NULL || ID == NULL || SK_p == NULL ||
381 4 : shared_secret == NULL || nonce == NULL || prf == NULL)
382 0 : return -1;
383 :
384 : /* prf(SK_pi/r,IDi/r') */
385 4 : buf_len = 4 + ID_len;
386 4 : buf = os_zalloc(buf_len);
387 4 : if (buf == NULL)
388 0 : return -1;
389 4 : buf[0] = ID_type;
390 4 : os_memcpy(buf + 4, ID, ID_len);
391 4 : if (ikev2_prf_hash(prf->id, SK_p, keys->SK_prf_len,
392 : 1, (const u8 **) &buf, &buf_len, hash) < 0) {
393 0 : os_free(buf);
394 0 : return -1;
395 : }
396 4 : os_free(buf);
397 :
398 : /* sign_data = msg | Nr/i | prf(SK_pi/r,IDi/r') */
399 4 : sign_len = wpabuf_len(sign_msg) + nonce_len + prf->hash_len;
400 4 : sign_data = os_malloc(sign_len);
401 4 : if (sign_data == NULL)
402 0 : return -1;
403 4 : pos = sign_data;
404 4 : os_memcpy(pos, wpabuf_head(sign_msg), wpabuf_len(sign_msg));
405 4 : pos += wpabuf_len(sign_msg);
406 4 : os_memcpy(pos, nonce, nonce_len);
407 4 : pos += nonce_len;
408 4 : os_memcpy(pos, hash, prf->hash_len);
409 :
410 : /* AUTH = prf(prf(Shared Secret, key pad, sign_data) */
411 4 : if (ikev2_prf_hash(prf->id, shared_secret, shared_secret_len, 1,
412 4 : &key_pad, &key_pad_len, hash) < 0 ||
413 4 : ikev2_prf_hash(prf->id, hash, prf->hash_len, 1,
414 : (const u8 **) &sign_data, &sign_len, auth_data) < 0)
415 : {
416 0 : os_free(sign_data);
417 0 : return -1;
418 : }
419 4 : os_free(sign_data);
420 :
421 4 : return 0;
422 : }
423 :
424 :
425 4 : u8 * ikev2_decrypt_payload(int encr_id, int integ_id,
426 : struct ikev2_keys *keys, int initiator,
427 : const struct ikev2_hdr *hdr,
428 : const u8 *encrypted, size_t encrypted_len,
429 : size_t *res_len)
430 : {
431 : size_t iv_len;
432 : const u8 *pos, *end, *iv, *integ;
433 : u8 hash[IKEV2_MAX_HASH_LEN], *decrypted;
434 : size_t decrypted_len, pad_len;
435 : const struct ikev2_integ_alg *integ_alg;
436 : const struct ikev2_encr_alg *encr_alg;
437 4 : const u8 *SK_e = initiator ? keys->SK_ei : keys->SK_er;
438 4 : const u8 *SK_a = initiator ? keys->SK_ai : keys->SK_ar;
439 :
440 4 : if (encrypted == NULL) {
441 0 : wpa_printf(MSG_INFO, "IKEV2: No Encrypted payload in SA_AUTH");
442 0 : return NULL;
443 : }
444 :
445 4 : encr_alg = ikev2_get_encr(encr_id);
446 4 : if (encr_alg == NULL) {
447 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported encryption type");
448 0 : return NULL;
449 : }
450 4 : iv_len = encr_alg->block_size;
451 :
452 4 : integ_alg = ikev2_get_integ(integ_id);
453 4 : if (integ_alg == NULL) {
454 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported intergrity type");
455 0 : return NULL;
456 : }
457 :
458 4 : if (encrypted_len < iv_len + 1 + integ_alg->hash_len) {
459 0 : wpa_printf(MSG_INFO, "IKEV2: No room for IV or Integrity "
460 : "Checksum");
461 0 : return NULL;
462 : }
463 :
464 4 : iv = encrypted;
465 4 : pos = iv + iv_len;
466 4 : end = encrypted + encrypted_len;
467 4 : integ = end - integ_alg->hash_len;
468 :
469 4 : if (SK_a == NULL) {
470 0 : wpa_printf(MSG_INFO, "IKEV2: No SK_a available");
471 0 : return NULL;
472 : }
473 4 : if (ikev2_integ_hash(integ_id, SK_a, keys->SK_integ_len,
474 : (const u8 *) hdr,
475 4 : integ - (const u8 *) hdr, hash) < 0) {
476 0 : wpa_printf(MSG_INFO, "IKEV2: Failed to calculate integrity "
477 : "hash");
478 0 : return NULL;
479 : }
480 4 : if (os_memcmp_const(integ, hash, integ_alg->hash_len) != 0) {
481 0 : wpa_printf(MSG_INFO, "IKEV2: Incorrect Integrity Checksum "
482 : "Data");
483 0 : return NULL;
484 : }
485 :
486 4 : if (SK_e == NULL) {
487 0 : wpa_printf(MSG_INFO, "IKEV2: No SK_e available");
488 0 : return NULL;
489 : }
490 :
491 4 : decrypted_len = integ - pos;
492 4 : decrypted = os_malloc(decrypted_len);
493 4 : if (decrypted == NULL)
494 0 : return NULL;
495 :
496 4 : if (ikev2_encr_decrypt(encr_alg->id, SK_e, keys->SK_encr_len, iv, pos,
497 : decrypted, decrypted_len) < 0) {
498 0 : os_free(decrypted);
499 0 : return NULL;
500 : }
501 :
502 4 : pad_len = decrypted[decrypted_len - 1];
503 4 : if (decrypted_len < pad_len + 1) {
504 0 : wpa_printf(MSG_INFO, "IKEV2: Invalid padding in encrypted "
505 : "payload");
506 0 : os_free(decrypted);
507 0 : return NULL;
508 : }
509 :
510 4 : decrypted_len -= pad_len + 1;
511 :
512 4 : *res_len = decrypted_len;
513 4 : return decrypted;
514 : }
515 :
516 :
517 4 : void ikev2_update_hdr(struct wpabuf *msg)
518 : {
519 : struct ikev2_hdr *hdr;
520 :
521 : /* Update lenth field in HDR */
522 4 : hdr = wpabuf_mhead(msg);
523 4 : WPA_PUT_BE32(hdr->length, wpabuf_len(msg));
524 4 : }
525 :
526 :
527 2 : int ikev2_build_encrypted(int encr_id, int integ_id, struct ikev2_keys *keys,
528 : int initiator, struct wpabuf *msg,
529 : struct wpabuf *plain, u8 next_payload)
530 : {
531 : struct ikev2_payload_hdr *phdr;
532 : size_t plen;
533 : size_t iv_len, pad_len;
534 : u8 *icv, *iv;
535 : const struct ikev2_integ_alg *integ_alg;
536 : const struct ikev2_encr_alg *encr_alg;
537 2 : const u8 *SK_e = initiator ? keys->SK_ei : keys->SK_er;
538 2 : const u8 *SK_a = initiator ? keys->SK_ai : keys->SK_ar;
539 :
540 2 : wpa_printf(MSG_DEBUG, "IKEV2: Adding Encrypted payload");
541 :
542 : /* Encr - RFC 4306, Sect. 3.14 */
543 :
544 2 : encr_alg = ikev2_get_encr(encr_id);
545 2 : if (encr_alg == NULL) {
546 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported encryption type");
547 0 : return -1;
548 : }
549 2 : iv_len = encr_alg->block_size;
550 :
551 2 : integ_alg = ikev2_get_integ(integ_id);
552 2 : if (integ_alg == NULL) {
553 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported intergrity type");
554 0 : return -1;
555 : }
556 :
557 2 : if (SK_e == NULL) {
558 0 : wpa_printf(MSG_INFO, "IKEV2: No SK_e available");
559 0 : return -1;
560 : }
561 :
562 2 : if (SK_a == NULL) {
563 0 : wpa_printf(MSG_INFO, "IKEV2: No SK_a available");
564 0 : return -1;
565 : }
566 :
567 2 : phdr = wpabuf_put(msg, sizeof(*phdr));
568 2 : phdr->next_payload = next_payload;
569 2 : phdr->flags = 0;
570 :
571 2 : iv = wpabuf_put(msg, iv_len);
572 2 : if (random_get_bytes(iv, iv_len)) {
573 0 : wpa_printf(MSG_INFO, "IKEV2: Could not generate IV");
574 0 : return -1;
575 : }
576 :
577 2 : pad_len = iv_len - (wpabuf_len(plain) + 1) % iv_len;
578 2 : if (pad_len == iv_len)
579 0 : pad_len = 0;
580 2 : wpabuf_put(plain, pad_len);
581 2 : wpabuf_put_u8(plain, pad_len);
582 :
583 4 : if (ikev2_encr_encrypt(encr_alg->id, SK_e, keys->SK_encr_len, iv,
584 2 : wpabuf_head(plain), wpabuf_mhead(plain),
585 : wpabuf_len(plain)) < 0)
586 0 : return -1;
587 :
588 2 : wpabuf_put_buf(msg, plain);
589 :
590 : /* Need to update all headers (Length fields) prior to hash func */
591 2 : icv = wpabuf_put(msg, integ_alg->hash_len);
592 2 : plen = (u8 *) wpabuf_put(msg, 0) - (u8 *) phdr;
593 2 : WPA_PUT_BE16(phdr->payload_length, plen);
594 :
595 2 : ikev2_update_hdr(msg);
596 :
597 4 : return ikev2_integ_hash(integ_id, SK_a, keys->SK_integ_len,
598 2 : wpabuf_head(msg),
599 2 : wpabuf_len(msg) - integ_alg->hash_len, icv);
600 :
601 : return 0;
602 : }
603 :
604 :
605 2 : int ikev2_keys_set(struct ikev2_keys *keys)
606 : {
607 8 : return keys->SK_d && keys->SK_ai && keys->SK_ar && keys->SK_ei &&
608 6 : keys->SK_er && keys->SK_pi && keys->SK_pr;
609 : }
610 :
611 :
612 4 : void ikev2_free_keys(struct ikev2_keys *keys)
613 : {
614 4 : os_free(keys->SK_d);
615 4 : os_free(keys->SK_ai);
616 4 : os_free(keys->SK_ar);
617 4 : os_free(keys->SK_ei);
618 4 : os_free(keys->SK_er);
619 4 : os_free(keys->SK_pi);
620 4 : os_free(keys->SK_pr);
621 4 : keys->SK_d = keys->SK_ai = keys->SK_ar = keys->SK_ei = keys->SK_er =
622 4 : keys->SK_pi = keys->SK_pr = NULL;
623 4 : }
624 :
625 :
626 2 : int ikev2_derive_sk_keys(const struct ikev2_prf_alg *prf,
627 : const struct ikev2_integ_alg *integ,
628 : const struct ikev2_encr_alg *encr,
629 : const u8 *skeyseed, const u8 *data, size_t data_len,
630 : struct ikev2_keys *keys)
631 : {
632 : u8 *keybuf, *pos;
633 : size_t keybuf_len;
634 :
635 : /*
636 : * {SK_d | SK_ai | SK_ar | SK_ei | SK_er | SK_pi | SK_pr } =
637 : * prf+(SKEYSEED, Ni | Nr | SPIi | SPIr )
638 : */
639 2 : ikev2_free_keys(keys);
640 2 : keys->SK_d_len = prf->key_len;
641 2 : keys->SK_integ_len = integ->key_len;
642 2 : keys->SK_encr_len = encr->key_len;
643 2 : keys->SK_prf_len = prf->key_len;
644 :
645 6 : keybuf_len = keys->SK_d_len + 2 * keys->SK_integ_len +
646 4 : 2 * keys->SK_encr_len + 2 * keys->SK_prf_len;
647 2 : keybuf = os_malloc(keybuf_len);
648 2 : if (keybuf == NULL)
649 0 : return -1;
650 :
651 2 : if (ikev2_prf_plus(prf->id, skeyseed, prf->hash_len,
652 : data, data_len, keybuf, keybuf_len)) {
653 0 : os_free(keybuf);
654 0 : return -1;
655 : }
656 :
657 2 : pos = keybuf;
658 :
659 2 : keys->SK_d = os_malloc(keys->SK_d_len);
660 2 : if (keys->SK_d) {
661 2 : os_memcpy(keys->SK_d, pos, keys->SK_d_len);
662 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_d",
663 2 : keys->SK_d, keys->SK_d_len);
664 : }
665 2 : pos += keys->SK_d_len;
666 :
667 2 : keys->SK_ai = os_malloc(keys->SK_integ_len);
668 2 : if (keys->SK_ai) {
669 2 : os_memcpy(keys->SK_ai, pos, keys->SK_integ_len);
670 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ai",
671 2 : keys->SK_ai, keys->SK_integ_len);
672 : }
673 2 : pos += keys->SK_integ_len;
674 :
675 2 : keys->SK_ar = os_malloc(keys->SK_integ_len);
676 2 : if (keys->SK_ar) {
677 2 : os_memcpy(keys->SK_ar, pos, keys->SK_integ_len);
678 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ar",
679 2 : keys->SK_ar, keys->SK_integ_len);
680 : }
681 2 : pos += keys->SK_integ_len;
682 :
683 2 : keys->SK_ei = os_malloc(keys->SK_encr_len);
684 2 : if (keys->SK_ei) {
685 2 : os_memcpy(keys->SK_ei, pos, keys->SK_encr_len);
686 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ei",
687 2 : keys->SK_ei, keys->SK_encr_len);
688 : }
689 2 : pos += keys->SK_encr_len;
690 :
691 2 : keys->SK_er = os_malloc(keys->SK_encr_len);
692 2 : if (keys->SK_er) {
693 2 : os_memcpy(keys->SK_er, pos, keys->SK_encr_len);
694 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_er",
695 2 : keys->SK_er, keys->SK_encr_len);
696 : }
697 2 : pos += keys->SK_encr_len;
698 :
699 2 : keys->SK_pi = os_malloc(keys->SK_prf_len);
700 2 : if (keys->SK_pi) {
701 2 : os_memcpy(keys->SK_pi, pos, keys->SK_prf_len);
702 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_pi",
703 2 : keys->SK_pi, keys->SK_prf_len);
704 : }
705 2 : pos += keys->SK_prf_len;
706 :
707 2 : keys->SK_pr = os_malloc(keys->SK_prf_len);
708 2 : if (keys->SK_pr) {
709 2 : os_memcpy(keys->SK_pr, pos, keys->SK_prf_len);
710 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_pr",
711 2 : keys->SK_pr, keys->SK_prf_len);
712 : }
713 :
714 2 : os_free(keybuf);
715 :
716 2 : if (!ikev2_keys_set(keys)) {
717 0 : ikev2_free_keys(keys);
718 0 : return -1;
719 : }
720 :
721 2 : return 0;
722 : }
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