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 : #ifdef CCNS_PL
177 : /* from des.c */
178 : struct des3_key_s {
179 : u32 ek[3][32];
180 : u32 dk[3][32];
181 : };
182 :
183 : void des3_key_setup(const u8 *key, struct des3_key_s *dkey);
184 : void des3_encrypt(const u8 *plain, const struct des3_key_s *key, u8 *crypt);
185 : void des3_decrypt(const u8 *crypt, const struct des3_key_s *key, u8 *plain);
186 : #endif /* CCNS_PL */
187 :
188 :
189 2 : int ikev2_encr_encrypt(int alg, const u8 *key, size_t key_len, const u8 *iv,
190 : const u8 *plain, u8 *crypt, size_t len)
191 : {
192 : struct crypto_cipher *cipher;
193 : int encr_alg;
194 :
195 : #ifdef CCNS_PL
196 : if (alg == ENCR_3DES) {
197 : struct des3_key_s des3key;
198 : size_t i, blocks;
199 : u8 *pos;
200 :
201 : /* ECB mode is used incorrectly for 3DES!? */
202 : if (key_len != 24) {
203 : wpa_printf(MSG_INFO, "IKEV2: Invalid encr key length");
204 : return -1;
205 : }
206 : des3_key_setup(key, &des3key);
207 :
208 : blocks = len / 8;
209 : pos = crypt;
210 : for (i = 0; i < blocks; i++) {
211 : des3_encrypt(pos, &des3key, pos);
212 : pos += 8;
213 : }
214 : } else {
215 : #endif /* CCNS_PL */
216 2 : switch (alg) {
217 : case ENCR_3DES:
218 0 : encr_alg = CRYPTO_CIPHER_ALG_3DES;
219 0 : break;
220 : case ENCR_AES_CBC:
221 2 : encr_alg = CRYPTO_CIPHER_ALG_AES;
222 2 : break;
223 : default:
224 0 : wpa_printf(MSG_DEBUG, "IKEV2: Unsupported encr alg %d", alg);
225 0 : return -1;
226 : }
227 :
228 2 : cipher = crypto_cipher_init(encr_alg, iv, key, key_len);
229 2 : if (cipher == NULL) {
230 0 : wpa_printf(MSG_INFO, "IKEV2: Failed to initialize cipher");
231 0 : return -1;
232 : }
233 :
234 2 : if (crypto_cipher_encrypt(cipher, plain, crypt, len) < 0) {
235 0 : wpa_printf(MSG_INFO, "IKEV2: Encryption failed");
236 0 : crypto_cipher_deinit(cipher);
237 0 : return -1;
238 : }
239 2 : crypto_cipher_deinit(cipher);
240 : #ifdef CCNS_PL
241 : }
242 : #endif /* CCNS_PL */
243 :
244 2 : return 0;
245 : }
246 :
247 :
248 4 : int ikev2_encr_decrypt(int alg, const u8 *key, size_t key_len, const u8 *iv,
249 : const u8 *crypt, u8 *plain, size_t len)
250 : {
251 : struct crypto_cipher *cipher;
252 : int encr_alg;
253 :
254 : #ifdef CCNS_PL
255 : if (alg == ENCR_3DES) {
256 : struct des3_key_s des3key;
257 : size_t i, blocks;
258 :
259 : /* ECB mode is used incorrectly for 3DES!? */
260 : if (key_len != 24) {
261 : wpa_printf(MSG_INFO, "IKEV2: Invalid encr key length");
262 : return -1;
263 : }
264 : des3_key_setup(key, &des3key);
265 :
266 : if (len % 8) {
267 : wpa_printf(MSG_INFO, "IKEV2: Invalid encrypted "
268 : "length");
269 : return -1;
270 : }
271 : blocks = len / 8;
272 : for (i = 0; i < blocks; i++) {
273 : des3_decrypt(crypt, &des3key, plain);
274 : plain += 8;
275 : crypt += 8;
276 : }
277 : } else {
278 : #endif /* CCNS_PL */
279 4 : switch (alg) {
280 : case ENCR_3DES:
281 0 : encr_alg = CRYPTO_CIPHER_ALG_3DES;
282 0 : break;
283 : case ENCR_AES_CBC:
284 4 : encr_alg = CRYPTO_CIPHER_ALG_AES;
285 4 : break;
286 : default:
287 0 : wpa_printf(MSG_DEBUG, "IKEV2: Unsupported encr alg %d", alg);
288 0 : return -1;
289 : }
290 :
291 4 : cipher = crypto_cipher_init(encr_alg, iv, key, key_len);
292 4 : if (cipher == NULL) {
293 0 : wpa_printf(MSG_INFO, "IKEV2: Failed to initialize cipher");
294 0 : return -1;
295 : }
296 :
297 4 : if (crypto_cipher_decrypt(cipher, crypt, plain, len) < 0) {
298 0 : wpa_printf(MSG_INFO, "IKEV2: Decryption failed");
299 0 : crypto_cipher_deinit(cipher);
300 0 : return -1;
301 : }
302 4 : crypto_cipher_deinit(cipher);
303 : #ifdef CCNS_PL
304 : }
305 : #endif /* CCNS_PL */
306 :
307 4 : return 0;
308 : }
309 :
310 :
311 8 : int ikev2_parse_payloads(struct ikev2_payloads *payloads,
312 : u8 next_payload, const u8 *pos, const u8 *end)
313 : {
314 : const struct ikev2_payload_hdr *phdr;
315 :
316 8 : os_memset(payloads, 0, sizeof(*payloads));
317 :
318 32 : while (next_payload != IKEV2_PAYLOAD_NO_NEXT_PAYLOAD) {
319 : int plen, pdatalen;
320 : const u8 *pdata;
321 16 : wpa_printf(MSG_DEBUG, "IKEV2: Processing payload %u",
322 : next_payload);
323 16 : if (end - pos < (int) sizeof(*phdr)) {
324 0 : wpa_printf(MSG_INFO, "IKEV2: Too short message for "
325 : "payload header (left=%ld)",
326 : (long) (end - pos));
327 : }
328 16 : phdr = (const struct ikev2_payload_hdr *) pos;
329 16 : plen = WPA_GET_BE16(phdr->payload_length);
330 16 : if (plen < (int) sizeof(*phdr) || pos + plen > end) {
331 0 : wpa_printf(MSG_INFO, "IKEV2: Invalid payload header "
332 : "length %d", plen);
333 0 : return -1;
334 : }
335 :
336 32 : wpa_printf(MSG_DEBUG, "IKEV2: Next Payload: %u Flags: 0x%x"
337 : " Payload Length: %d",
338 32 : phdr->next_payload, phdr->flags, plen);
339 :
340 16 : pdata = (const u8 *) (phdr + 1);
341 16 : pdatalen = plen - sizeof(*phdr);
342 :
343 16 : switch (next_payload) {
344 : case IKEV2_PAYLOAD_SA:
345 2 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Security "
346 : "Association");
347 2 : payloads->sa = pdata;
348 2 : payloads->sa_len = pdatalen;
349 2 : break;
350 : case IKEV2_PAYLOAD_KEY_EXCHANGE:
351 2 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Key "
352 : "Exchange");
353 2 : payloads->ke = pdata;
354 2 : payloads->ke_len = pdatalen;
355 2 : break;
356 : case IKEV2_PAYLOAD_IDi:
357 0 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: IDi");
358 0 : payloads->idi = pdata;
359 0 : payloads->idi_len = pdatalen;
360 0 : break;
361 : case IKEV2_PAYLOAD_IDr:
362 4 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: IDr");
363 4 : payloads->idr = pdata;
364 4 : payloads->idr_len = pdatalen;
365 4 : break;
366 : case IKEV2_PAYLOAD_CERTIFICATE:
367 0 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Certificate");
368 0 : payloads->cert = pdata;
369 0 : payloads->cert_len = pdatalen;
370 0 : break;
371 : case IKEV2_PAYLOAD_AUTHENTICATION:
372 2 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: "
373 : "Authentication");
374 2 : payloads->auth = pdata;
375 2 : payloads->auth_len = pdatalen;
376 2 : break;
377 : case IKEV2_PAYLOAD_NONCE:
378 2 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Nonce");
379 2 : payloads->nonce = pdata;
380 2 : payloads->nonce_len = pdatalen;
381 2 : break;
382 : case IKEV2_PAYLOAD_ENCRYPTED:
383 4 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: Encrypted");
384 4 : payloads->encrypted = pdata;
385 4 : payloads->encrypted_len = pdatalen;
386 4 : break;
387 : case IKEV2_PAYLOAD_NOTIFICATION:
388 0 : wpa_printf(MSG_DEBUG, "IKEV2: Payload: "
389 : "Notification");
390 0 : payloads->notification = pdata;
391 0 : payloads->notification_len = pdatalen;
392 0 : break;
393 : default:
394 0 : if (phdr->flags & IKEV2_PAYLOAD_FLAGS_CRITICAL) {
395 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported "
396 : "critical payload %u - reject the "
397 : "entire message", next_payload);
398 0 : return -1;
399 : } else {
400 0 : wpa_printf(MSG_DEBUG, "IKEV2: Skipped "
401 : "unsupported payload %u",
402 : next_payload);
403 : }
404 : }
405 :
406 20 : if (next_payload == IKEV2_PAYLOAD_ENCRYPTED &&
407 4 : pos + plen == end) {
408 : /*
409 : * Next Payload in the case of Encrypted Payload is
410 : * actually the payload type for the first embedded
411 : * payload.
412 : */
413 4 : payloads->encr_next_payload = phdr->next_payload;
414 4 : next_payload = IKEV2_PAYLOAD_NO_NEXT_PAYLOAD;
415 : } else
416 12 : next_payload = phdr->next_payload;
417 :
418 16 : pos += plen;
419 : }
420 :
421 8 : if (pos != end) {
422 0 : wpa_printf(MSG_INFO, "IKEV2: Unexpected extra data after "
423 : "payloads");
424 0 : return -1;
425 : }
426 :
427 8 : return 0;
428 : }
429 :
430 :
431 4 : int ikev2_derive_auth_data(int prf_alg, const struct wpabuf *sign_msg,
432 : const u8 *ID, size_t ID_len, u8 ID_type,
433 : struct ikev2_keys *keys, int initiator,
434 : const u8 *shared_secret, size_t shared_secret_len,
435 : const u8 *nonce, size_t nonce_len,
436 : const u8 *key_pad, size_t key_pad_len,
437 : u8 *auth_data)
438 : {
439 : size_t sign_len, buf_len;
440 : u8 *sign_data, *pos, *buf, hash[IKEV2_MAX_HASH_LEN];
441 : const struct ikev2_prf_alg *prf;
442 4 : const u8 *SK_p = initiator ? keys->SK_pi : keys->SK_pr;
443 :
444 4 : prf = ikev2_get_prf(prf_alg);
445 4 : if (sign_msg == NULL || ID == NULL || SK_p == NULL ||
446 4 : shared_secret == NULL || nonce == NULL || prf == NULL)
447 0 : return -1;
448 :
449 : /* prf(SK_pi/r,IDi/r') */
450 4 : buf_len = 4 + ID_len;
451 4 : buf = os_zalloc(buf_len);
452 4 : if (buf == NULL)
453 0 : return -1;
454 4 : buf[0] = ID_type;
455 4 : os_memcpy(buf + 4, ID, ID_len);
456 4 : if (ikev2_prf_hash(prf->id, SK_p, keys->SK_prf_len,
457 : 1, (const u8 **) &buf, &buf_len, hash) < 0) {
458 0 : os_free(buf);
459 0 : return -1;
460 : }
461 4 : os_free(buf);
462 :
463 : /* sign_data = msg | Nr/i | prf(SK_pi/r,IDi/r') */
464 4 : sign_len = wpabuf_len(sign_msg) + nonce_len + prf->hash_len;
465 4 : sign_data = os_malloc(sign_len);
466 4 : if (sign_data == NULL)
467 0 : return -1;
468 4 : pos = sign_data;
469 4 : os_memcpy(pos, wpabuf_head(sign_msg), wpabuf_len(sign_msg));
470 4 : pos += wpabuf_len(sign_msg);
471 4 : os_memcpy(pos, nonce, nonce_len);
472 4 : pos += nonce_len;
473 4 : os_memcpy(pos, hash, prf->hash_len);
474 :
475 : /* AUTH = prf(prf(Shared Secret, key pad, sign_data) */
476 4 : if (ikev2_prf_hash(prf->id, shared_secret, shared_secret_len, 1,
477 4 : &key_pad, &key_pad_len, hash) < 0 ||
478 4 : ikev2_prf_hash(prf->id, hash, prf->hash_len, 1,
479 : (const u8 **) &sign_data, &sign_len, auth_data) < 0)
480 : {
481 0 : os_free(sign_data);
482 0 : return -1;
483 : }
484 4 : os_free(sign_data);
485 :
486 4 : return 0;
487 : }
488 :
489 :
490 4 : u8 * ikev2_decrypt_payload(int encr_id, int integ_id,
491 : struct ikev2_keys *keys, int initiator,
492 : const struct ikev2_hdr *hdr,
493 : const u8 *encrypted, size_t encrypted_len,
494 : size_t *res_len)
495 : {
496 : size_t iv_len;
497 : const u8 *pos, *end, *iv, *integ;
498 : u8 hash[IKEV2_MAX_HASH_LEN], *decrypted;
499 : size_t decrypted_len, pad_len;
500 : const struct ikev2_integ_alg *integ_alg;
501 : const struct ikev2_encr_alg *encr_alg;
502 4 : const u8 *SK_e = initiator ? keys->SK_ei : keys->SK_er;
503 4 : const u8 *SK_a = initiator ? keys->SK_ai : keys->SK_ar;
504 :
505 4 : if (encrypted == NULL) {
506 0 : wpa_printf(MSG_INFO, "IKEV2: No Encrypted payload in SA_AUTH");
507 0 : return NULL;
508 : }
509 :
510 4 : encr_alg = ikev2_get_encr(encr_id);
511 4 : if (encr_alg == NULL) {
512 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported encryption type");
513 0 : return NULL;
514 : }
515 4 : iv_len = encr_alg->block_size;
516 :
517 4 : integ_alg = ikev2_get_integ(integ_id);
518 4 : if (integ_alg == NULL) {
519 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported intergrity type");
520 0 : return NULL;
521 : }
522 :
523 4 : if (encrypted_len < iv_len + 1 + integ_alg->hash_len) {
524 0 : wpa_printf(MSG_INFO, "IKEV2: No room for IV or Integrity "
525 : "Checksum");
526 0 : return NULL;
527 : }
528 :
529 4 : iv = encrypted;
530 4 : pos = iv + iv_len;
531 4 : end = encrypted + encrypted_len;
532 4 : integ = end - integ_alg->hash_len;
533 :
534 4 : if (SK_a == NULL) {
535 0 : wpa_printf(MSG_INFO, "IKEV2: No SK_a available");
536 0 : return NULL;
537 : }
538 4 : if (ikev2_integ_hash(integ_id, SK_a, keys->SK_integ_len,
539 : (const u8 *) hdr,
540 4 : integ - (const u8 *) hdr, hash) < 0) {
541 0 : wpa_printf(MSG_INFO, "IKEV2: Failed to calculate integrity "
542 : "hash");
543 0 : return NULL;
544 : }
545 4 : if (os_memcmp(integ, hash, integ_alg->hash_len) != 0) {
546 0 : wpa_printf(MSG_INFO, "IKEV2: Incorrect Integrity Checksum "
547 : "Data");
548 0 : return NULL;
549 : }
550 :
551 4 : if (SK_e == NULL) {
552 0 : wpa_printf(MSG_INFO, "IKEV2: No SK_e available");
553 0 : return NULL;
554 : }
555 :
556 4 : decrypted_len = integ - pos;
557 4 : decrypted = os_malloc(decrypted_len);
558 4 : if (decrypted == NULL)
559 0 : return NULL;
560 :
561 4 : if (ikev2_encr_decrypt(encr_alg->id, SK_e, keys->SK_encr_len, iv, pos,
562 : decrypted, decrypted_len) < 0) {
563 0 : os_free(decrypted);
564 0 : return NULL;
565 : }
566 :
567 4 : pad_len = decrypted[decrypted_len - 1];
568 4 : if (decrypted_len < pad_len + 1) {
569 0 : wpa_printf(MSG_INFO, "IKEV2: Invalid padding in encrypted "
570 : "payload");
571 0 : os_free(decrypted);
572 0 : return NULL;
573 : }
574 :
575 4 : decrypted_len -= pad_len + 1;
576 :
577 4 : *res_len = decrypted_len;
578 4 : return decrypted;
579 : }
580 :
581 :
582 4 : void ikev2_update_hdr(struct wpabuf *msg)
583 : {
584 : struct ikev2_hdr *hdr;
585 :
586 : /* Update lenth field in HDR */
587 4 : hdr = wpabuf_mhead(msg);
588 4 : WPA_PUT_BE32(hdr->length, wpabuf_len(msg));
589 4 : }
590 :
591 :
592 2 : int ikev2_build_encrypted(int encr_id, int integ_id, struct ikev2_keys *keys,
593 : int initiator, struct wpabuf *msg,
594 : struct wpabuf *plain, u8 next_payload)
595 : {
596 : struct ikev2_payload_hdr *phdr;
597 : size_t plen;
598 : size_t iv_len, pad_len;
599 : u8 *icv, *iv;
600 : const struct ikev2_integ_alg *integ_alg;
601 : const struct ikev2_encr_alg *encr_alg;
602 2 : const u8 *SK_e = initiator ? keys->SK_ei : keys->SK_er;
603 2 : const u8 *SK_a = initiator ? keys->SK_ai : keys->SK_ar;
604 :
605 2 : wpa_printf(MSG_DEBUG, "IKEV2: Adding Encrypted payload");
606 :
607 : /* Encr - RFC 4306, Sect. 3.14 */
608 :
609 2 : encr_alg = ikev2_get_encr(encr_id);
610 2 : if (encr_alg == NULL) {
611 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported encryption type");
612 0 : return -1;
613 : }
614 2 : iv_len = encr_alg->block_size;
615 :
616 2 : integ_alg = ikev2_get_integ(integ_id);
617 2 : if (integ_alg == NULL) {
618 0 : wpa_printf(MSG_INFO, "IKEV2: Unsupported intergrity type");
619 0 : return -1;
620 : }
621 :
622 2 : if (SK_e == NULL) {
623 0 : wpa_printf(MSG_INFO, "IKEV2: No SK_e available");
624 0 : return -1;
625 : }
626 :
627 2 : if (SK_a == NULL) {
628 0 : wpa_printf(MSG_INFO, "IKEV2: No SK_a available");
629 0 : return -1;
630 : }
631 :
632 2 : phdr = wpabuf_put(msg, sizeof(*phdr));
633 2 : phdr->next_payload = next_payload;
634 2 : phdr->flags = 0;
635 :
636 2 : iv = wpabuf_put(msg, iv_len);
637 2 : if (random_get_bytes(iv, iv_len)) {
638 0 : wpa_printf(MSG_INFO, "IKEV2: Could not generate IV");
639 0 : return -1;
640 : }
641 :
642 2 : pad_len = iv_len - (wpabuf_len(plain) + 1) % iv_len;
643 2 : if (pad_len == iv_len)
644 0 : pad_len = 0;
645 2 : wpabuf_put(plain, pad_len);
646 2 : wpabuf_put_u8(plain, pad_len);
647 :
648 4 : if (ikev2_encr_encrypt(encr_alg->id, SK_e, keys->SK_encr_len, iv,
649 2 : wpabuf_head(plain), wpabuf_mhead(plain),
650 : wpabuf_len(plain)) < 0)
651 0 : return -1;
652 :
653 2 : wpabuf_put_buf(msg, plain);
654 :
655 : /* Need to update all headers (Length fields) prior to hash func */
656 2 : icv = wpabuf_put(msg, integ_alg->hash_len);
657 2 : plen = (u8 *) wpabuf_put(msg, 0) - (u8 *) phdr;
658 2 : WPA_PUT_BE16(phdr->payload_length, plen);
659 :
660 2 : ikev2_update_hdr(msg);
661 :
662 4 : return ikev2_integ_hash(integ_id, SK_a, keys->SK_integ_len,
663 2 : wpabuf_head(msg),
664 2 : wpabuf_len(msg) - integ_alg->hash_len, icv);
665 :
666 : return 0;
667 : }
668 :
669 :
670 2 : int ikev2_keys_set(struct ikev2_keys *keys)
671 : {
672 8 : return keys->SK_d && keys->SK_ai && keys->SK_ar && keys->SK_ei &&
673 6 : keys->SK_er && keys->SK_pi && keys->SK_pr;
674 : }
675 :
676 :
677 4 : void ikev2_free_keys(struct ikev2_keys *keys)
678 : {
679 4 : os_free(keys->SK_d);
680 4 : os_free(keys->SK_ai);
681 4 : os_free(keys->SK_ar);
682 4 : os_free(keys->SK_ei);
683 4 : os_free(keys->SK_er);
684 4 : os_free(keys->SK_pi);
685 4 : os_free(keys->SK_pr);
686 4 : keys->SK_d = keys->SK_ai = keys->SK_ar = keys->SK_ei = keys->SK_er =
687 4 : keys->SK_pi = keys->SK_pr = NULL;
688 4 : }
689 :
690 :
691 2 : int ikev2_derive_sk_keys(const struct ikev2_prf_alg *prf,
692 : const struct ikev2_integ_alg *integ,
693 : const struct ikev2_encr_alg *encr,
694 : const u8 *skeyseed, const u8 *data, size_t data_len,
695 : struct ikev2_keys *keys)
696 : {
697 : u8 *keybuf, *pos;
698 : size_t keybuf_len;
699 :
700 : /*
701 : * {SK_d | SK_ai | SK_ar | SK_ei | SK_er | SK_pi | SK_pr } =
702 : * prf+(SKEYSEED, Ni | Nr | SPIi | SPIr )
703 : */
704 2 : ikev2_free_keys(keys);
705 2 : keys->SK_d_len = prf->key_len;
706 2 : keys->SK_integ_len = integ->key_len;
707 2 : keys->SK_encr_len = encr->key_len;
708 2 : keys->SK_prf_len = prf->key_len;
709 : #ifdef CCNS_PL
710 : /* Uses encryption key length for SK_d; should be PRF length */
711 : keys->SK_d_len = keys->SK_encr_len;
712 : #endif /* CCNS_PL */
713 :
714 6 : keybuf_len = keys->SK_d_len + 2 * keys->SK_integ_len +
715 4 : 2 * keys->SK_encr_len + 2 * keys->SK_prf_len;
716 2 : keybuf = os_malloc(keybuf_len);
717 2 : if (keybuf == NULL)
718 0 : return -1;
719 :
720 2 : if (ikev2_prf_plus(prf->id, skeyseed, prf->hash_len,
721 : data, data_len, keybuf, keybuf_len)) {
722 0 : os_free(keybuf);
723 0 : return -1;
724 : }
725 :
726 2 : pos = keybuf;
727 :
728 2 : keys->SK_d = os_malloc(keys->SK_d_len);
729 2 : if (keys->SK_d) {
730 2 : os_memcpy(keys->SK_d, pos, keys->SK_d_len);
731 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_d",
732 2 : keys->SK_d, keys->SK_d_len);
733 : }
734 2 : pos += keys->SK_d_len;
735 :
736 2 : keys->SK_ai = os_malloc(keys->SK_integ_len);
737 2 : if (keys->SK_ai) {
738 2 : os_memcpy(keys->SK_ai, pos, keys->SK_integ_len);
739 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ai",
740 2 : keys->SK_ai, keys->SK_integ_len);
741 : }
742 2 : pos += keys->SK_integ_len;
743 :
744 2 : keys->SK_ar = os_malloc(keys->SK_integ_len);
745 2 : if (keys->SK_ar) {
746 2 : os_memcpy(keys->SK_ar, pos, keys->SK_integ_len);
747 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ar",
748 2 : keys->SK_ar, keys->SK_integ_len);
749 : }
750 2 : pos += keys->SK_integ_len;
751 :
752 2 : keys->SK_ei = os_malloc(keys->SK_encr_len);
753 2 : if (keys->SK_ei) {
754 2 : os_memcpy(keys->SK_ei, pos, keys->SK_encr_len);
755 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ei",
756 2 : keys->SK_ei, keys->SK_encr_len);
757 : }
758 2 : pos += keys->SK_encr_len;
759 :
760 2 : keys->SK_er = os_malloc(keys->SK_encr_len);
761 2 : if (keys->SK_er) {
762 2 : os_memcpy(keys->SK_er, pos, keys->SK_encr_len);
763 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_er",
764 2 : keys->SK_er, keys->SK_encr_len);
765 : }
766 2 : pos += keys->SK_encr_len;
767 :
768 2 : keys->SK_pi = os_malloc(keys->SK_prf_len);
769 2 : if (keys->SK_pi) {
770 2 : os_memcpy(keys->SK_pi, pos, keys->SK_prf_len);
771 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_pi",
772 2 : keys->SK_pi, keys->SK_prf_len);
773 : }
774 2 : pos += keys->SK_prf_len;
775 :
776 2 : keys->SK_pr = os_malloc(keys->SK_prf_len);
777 2 : if (keys->SK_pr) {
778 2 : os_memcpy(keys->SK_pr, pos, keys->SK_prf_len);
779 4 : wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_pr",
780 2 : keys->SK_pr, keys->SK_prf_len);
781 : }
782 :
783 2 : os_free(keybuf);
784 :
785 2 : if (!ikev2_keys_set(keys)) {
786 0 : ikev2_free_keys(keys);
787 0 : return -1;
788 : }
789 :
790 2 : return 0;
791 : }
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