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[dragonfly.git] / sys / netinet6 / esp_core.c
blobee127ceba3030934bb695890319c48864f36113a
1 /* $FreeBSD: src/sys/netinet6/esp_core.c,v 1.23.2.1 2007/12/07 08:45:28 gnn Exp $ */
2 /* $KAME: esp_core.c,v 1.50 2000/11/02 12:27:38 itojun Exp $ */
3
4 /*-
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include "opt_inet.h"
34 #include "opt_inet6.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/malloc.h>
39 #include <sys/mbuf.h>
40 #include <sys/domain.h>
41 #include <sys/protosw.h>
42 #include <sys/socket.h>
43 #include <sys/errno.h>
44 #include <sys/time.h>
45 #include <sys/syslog.h>
46
47 #include <net/if.h>
48 #include <net/route.h>
49
50 #include <netinet/in.h>
51 #include <netinet/in_var.h>
52 #ifdef INET6
53 #include <netinet/ip6.h>
54 #include <netinet6/ip6_var.h>
55 #include <netinet/icmp6.h>
56 #endif
57
58 #include <netinet6/ipsec.h>
59 #ifdef INET6
60 #include <netinet6/ipsec6.h>
61 #endif
62 #include <netinet6/ah.h>
63 #ifdef INET6
64 #include <netinet6/ah6.h>
65 #endif
66 #include <netinet6/esp.h>
67 #ifdef INET6
68 #include <netinet6/esp6.h>
69 #endif
70 #include <netinet6/esp_rijndael.h>
71 #include <netinet6/esp_camellia.h>
72 #include <netinet6/esp_aesctr.h>
73 #include <net/pfkeyv2.h>
74 #include <netproto/key/keydb.h>
75 #include <netproto/key/key.h>
76
77 #include <crypto/des/des.h>
78 #include <crypto/blowfish/blowfish.h>
79
80 #include <opencrypto/cast.h>
81 #define cast128_key cast_key
82 #define cast128_setkey(key, rawkey, keybytes) \
83 cast_setkey((key), (rawkey), (keybytes))
84 #define cast128_encrypt(key, inblock, outblock) \
85 cast_encrypt((key), (inblock), (outblock))
86 #define cast128_decrypt(key, inblock, outblock) \
87 cast_decrypt((key), (inblock), (outblock))
88
89 #include <net/net_osdep.h>
90
91 static int esp_null_mature (struct secasvar *);
92 static int esp_null_decrypt (struct mbuf *, size_t,
93 struct secasvar *, const struct esp_algorithm *, int);
94 static int esp_null_encrypt (struct mbuf *, size_t, size_t,
95 struct secasvar *, const struct esp_algorithm *, int);
96 static int esp_descbc_mature (struct secasvar *);
97 static int esp_descbc_ivlen (const struct esp_algorithm *,
98 struct secasvar *);
99 static int esp_des_schedule (const struct esp_algorithm *,
100 struct secasvar *);
101 static size_t esp_des_schedlen (const struct esp_algorithm *);
102 static int esp_des_blockdecrypt (const struct esp_algorithm *,
103 struct secasvar *, u_int8_t *, u_int8_t *);
104 static int esp_des_blockencrypt (const struct esp_algorithm *,
105 struct secasvar *, u_int8_t *, u_int8_t *);
106 static int esp_cbc_mature (struct secasvar *);
107 static int esp_blowfish_schedule (const struct esp_algorithm *,
108 struct secasvar *);
109 static size_t esp_blowfish_schedlen (const struct esp_algorithm *);
110 static int esp_blowfish_blockdecrypt (const struct esp_algorithm *,
111 struct secasvar *, u_int8_t *, u_int8_t *);
112 static int esp_blowfish_blockencrypt (const struct esp_algorithm *,
113 struct secasvar *, u_int8_t *, u_int8_t *);
114 static int esp_cast128_schedule (const struct esp_algorithm *,
115 struct secasvar *);
116 static size_t esp_cast128_schedlen (const struct esp_algorithm *);
117 static int esp_cast128_blockdecrypt (const struct esp_algorithm *,
118 struct secasvar *, u_int8_t *, u_int8_t *);
119 static int esp_cast128_blockencrypt (const struct esp_algorithm *,
120 struct secasvar *, u_int8_t *, u_int8_t *);
121 static int esp_3des_schedule (const struct esp_algorithm *,
122 struct secasvar *);
123 static size_t esp_3des_schedlen (const struct esp_algorithm *);
124 static int esp_3des_blockdecrypt (const struct esp_algorithm *,
125 struct secasvar *, u_int8_t *, u_int8_t *);
126 static int esp_3des_blockencrypt (const struct esp_algorithm *,
127 struct secasvar *, u_int8_t *, u_int8_t *);
128 static int esp_common_ivlen (const struct esp_algorithm *,
129 struct secasvar *);
130 static int esp_cbc_decrypt (struct mbuf *, size_t,
131 struct secasvar *, const struct esp_algorithm *, int);
132 static int esp_cbc_encrypt (struct mbuf *, size_t, size_t,
133 struct secasvar *, const struct esp_algorithm *, int);
134
135 #define MAXIVLEN 16
136
137 static const struct esp_algorithm esp_algorithms[] = {
138 { 8, -1, esp_descbc_mature, 64, 64, esp_des_schedlen,
139 "des-cbc",
140 esp_descbc_ivlen, esp_cbc_decrypt,
141 esp_cbc_encrypt, esp_des_schedule,
142 esp_des_blockdecrypt, esp_des_blockencrypt, },
143 { 8, 8, esp_cbc_mature, 192, 192, esp_3des_schedlen,
144 "3des-cbc",
145 esp_common_ivlen, esp_cbc_decrypt,
146 esp_cbc_encrypt, esp_3des_schedule,
147 esp_3des_blockdecrypt, esp_3des_blockencrypt, },
148 { 1, 0, esp_null_mature, 0, 2048, NULL, "null",
149 esp_common_ivlen, esp_null_decrypt,
150 esp_null_encrypt, NULL, },
151 { 8, 8, esp_cbc_mature, 40, 448, esp_blowfish_schedlen, "blowfish-cbc",
152 esp_common_ivlen, esp_cbc_decrypt,
153 esp_cbc_encrypt, esp_blowfish_schedule,
154 esp_blowfish_blockdecrypt, esp_blowfish_blockencrypt, },
155 { 8, 8, esp_cbc_mature, 40, 128, esp_cast128_schedlen,
156 "cast128-cbc",
157 esp_common_ivlen, esp_cbc_decrypt,
158 esp_cbc_encrypt, esp_cast128_schedule,
159 esp_cast128_blockdecrypt, esp_cast128_blockencrypt, },
160 { 16, 16, esp_cbc_mature, 128, 256, esp_rijndael_schedlen,
161 "rijndael-cbc",
162 esp_common_ivlen, esp_cbc_decrypt,
163 esp_cbc_encrypt, esp_rijndael_schedule,
164 esp_rijndael_blockdecrypt, esp_rijndael_blockencrypt },
165 { 16, 8, esp_aesctr_mature, 160, 288, esp_aesctr_schedlen, "aes-ctr",
166 esp_common_ivlen, esp_aesctr_decrypt,
167 esp_aesctr_encrypt, esp_aesctr_schedule },
168 { 16, 16, esp_cbc_mature, 128, 256, esp_camellia_schedlen,
169 "camellia-cbc",
170 esp_common_ivlen, esp_cbc_decrypt,
171 esp_cbc_encrypt, esp_camellia_schedule,
172 esp_camellia_blockdecrypt, esp_camellia_blockencrypt },
173 };
174
175 const struct esp_algorithm *
176 esp_algorithm_lookup(int idx)
177 {
178
179 switch (idx) {
180 case SADB_EALG_DESCBC:
181 return &esp_algorithms[0];
182 case SADB_EALG_3DESCBC:
183 return &esp_algorithms[1];
184 case SADB_EALG_NULL:
185 return &esp_algorithms[2];
186 case SADB_X_EALG_BLOWFISHCBC:
187 return &esp_algorithms[3];
188 case SADB_X_EALG_CAST128CBC:
189 return &esp_algorithms[4];
190 case SADB_X_EALG_RIJNDAELCBC:
191 return &esp_algorithms[5];
192 case SADB_X_EALG_AESCTR:
193 return &esp_algorithms[6];
194 case SADB_X_EALG_CAMELLIACBC:
195 return &esp_algorithms[7];
196 default:
197 return NULL;
198 }
199 }
200
201 int
202 esp_max_ivlen(void)
203 {
204 int idx;
205 int ivlen;
206
207 ivlen = 0;
208 for (idx = 0; idx < NELEM(esp_algorithms);
209 idx++) {
210 if (esp_algorithms[idx].ivlenval > ivlen)
211 ivlen = esp_algorithms[idx].ivlenval;
212 }
213 return ivlen;
214 }
215
216 int
217 esp_schedule(const struct esp_algorithm *algo, struct secasvar *sav)
218 {
219 int error;
220
221 /* check for key length */
222 if (_KEYBITS(sav->key_enc) < algo->keymin ||
223 _KEYBITS(sav->key_enc) > algo->keymax) {
224 ipseclog((LOG_ERR,
225 "esp_schedule %s: unsupported key length %d: "
226 "needs %d to %d bits\n", algo->name, _KEYBITS(sav->key_enc),
227 algo->keymin, algo->keymax));
228 return EINVAL;
229 }
230
231 /* already allocated */
232 if (sav->sched && sav->schedlen != 0)
233 return 0;
234 /* no schedule necessary */
235 if (!algo->schedule || !algo->schedlen)
236 return 0;
237
238 sav->schedlen = (*algo->schedlen)(algo);
239 sav->sched = kmalloc(sav->schedlen, M_SECA, M_NOWAIT);
240 if (!sav->sched) {
241 sav->schedlen = 0;
242 return ENOBUFS;
243 }
244
245 error = (*algo->schedule)(algo, sav);
246 if (error) {
247 ipseclog((LOG_ERR, "esp_schedule %s: error %d\n",
248 algo->name, error));
249 bzero(sav->sched, sav->schedlen);
250 kfree(sav->sched, M_SECA);
251 sav->sched = NULL;
252 sav->schedlen = 0;
253 }
254 return error;
255 }
256
257 static int
258 esp_null_mature(struct secasvar *sav)
259 {
260
261 /* anything is okay */
262 return 0;
263 }
264
265 static int
266 esp_null_decrypt(struct mbuf *m,
267 size_t off, /* offset to ESP header */
268 struct secasvar *sav, const struct esp_algorithm *algo,
269 int ivlen)
270 {
271
272 return 0; /* do nothing */
273 }
274
275 static int
276 esp_null_encrypt(struct mbuf *m,
277 size_t off, /* offset to ESP header */
278 size_t plen, struct secasvar *sav,
279 const struct esp_algorithm *algo, int ivlen)
280 {
281
282 return 0; /* do nothing */
283 }
284
285 static int
286 esp_descbc_mature(struct secasvar *sav)
287 {
288 const struct esp_algorithm *algo;
289
290 if (!(sav->flags & SADB_X_EXT_OLD) && (sav->flags & SADB_X_EXT_IV4B)) {
291 ipseclog((LOG_ERR, "esp_cbc_mature: "
292 "algorithm incompatible with 4 octets IV length\n"));
293 return 1;
294 }
295
296 if (!sav->key_enc) {
297 ipseclog((LOG_ERR, "esp_descbc_mature: no key is given.\n"));
298 return 1;
299 }
300
301 algo = esp_algorithm_lookup(sav->alg_enc);
302 if (!algo) {
303 ipseclog((LOG_ERR,
304 "esp_descbc_mature: unsupported algorithm.\n"));
305 return 1;
306 }
307
308 if (_KEYBITS(sav->key_enc) < algo->keymin ||
309 _KEYBITS(sav->key_enc) > algo->keymax) {
310 ipseclog((LOG_ERR,
311 "esp_descbc_mature: invalid key length %d.\n",
312 _KEYBITS(sav->key_enc)));
313 return 1;
314 }
315
316 /* weak key check */
317 if (des_is_weak_key((des_cblock *)_KEYBUF(sav->key_enc))) {
318 ipseclog((LOG_ERR,
319 "esp_descbc_mature: weak key was passed.\n"));
320 return 1;
321 }
322
323 return 0;
324 }
325
326 static int
327 esp_descbc_ivlen(const struct esp_algorithm *algo, struct secasvar *sav)
328 {
329
330 if (!sav)
331 return 8;
332 if ((sav->flags & SADB_X_EXT_OLD) && (sav->flags & SADB_X_EXT_IV4B))
333 return 4;
334 if (!(sav->flags & SADB_X_EXT_OLD) && (sav->flags & SADB_X_EXT_DERIV))
335 return 4;
336 return 8;
337 }
338
339 static size_t
340 esp_des_schedlen(const struct esp_algorithm *algo)
341 {
342
343 return sizeof(des_key_schedule);
344 }
345
346 static int
347 esp_des_schedule(const struct esp_algorithm *algo, struct secasvar *sav)
348 {
349
350 if (des_key_sched((des_cblock *)_KEYBUF(sav->key_enc),
351 *(des_key_schedule *)sav->sched))
352 return EINVAL;
353 else
354 return 0;
355 }
356
357 static int
358 esp_des_blockdecrypt(const struct esp_algorithm *algo, struct secasvar *sav,
359 u_int8_t *s, u_int8_t *d)
360 {
361
362 /* assumption: d has a good alignment */
363 bcopy(s, d, sizeof(DES_LONG) * 2);
364 des_ecb_encrypt((des_cblock *)d, (des_cblock *)d,
365 *(des_key_schedule *)sav->sched, DES_DECRYPT);
366 return 0;
367 }
368
369 static int
370 esp_des_blockencrypt(const struct esp_algorithm *algo, struct secasvar *sav,
371 u_int8_t *s, u_int8_t *d)
372 {
373
374 /* assumption: d has a good alignment */
375 bcopy(s, d, sizeof(DES_LONG) * 2);
376 des_ecb_encrypt((des_cblock *)d, (des_cblock *)d,
377 *(des_key_schedule *)sav->sched, DES_ENCRYPT);
378 return 0;
379 }
380
381 static int
382 esp_cbc_mature(struct secasvar *sav)
383 {
384 int keylen;
385 const struct esp_algorithm *algo;
386
387 if (sav->flags & SADB_X_EXT_OLD) {
388 ipseclog((LOG_ERR,
389 "esp_cbc_mature: algorithm incompatible with esp-old\n"));
390 return 1;
391 }
392 if (sav->flags & SADB_X_EXT_DERIV) {
393 ipseclog((LOG_ERR,
394 "esp_cbc_mature: algorithm incompatible with derived\n"));
395 return 1;
396 }
397
398 if (!sav->key_enc) {
399 ipseclog((LOG_ERR, "esp_cbc_mature: no key is given.\n"));
400 return 1;
401 }
402
403 algo = esp_algorithm_lookup(sav->alg_enc);
404 if (!algo) {
405 ipseclog((LOG_ERR,
406 "esp_cbc_mature: unsupported algorithm %d\n",
407 sav->alg_enc));
408 return 1;
409 }
410
411 keylen = sav->key_enc->sadb_key_bits;
412 if (keylen < algo->keymin || algo->keymax < keylen) {
413 ipseclog((LOG_ERR,
414 "esp_cbc_mature %s: invalid key length %d.\n",
415 algo->name, sav->key_enc->sadb_key_bits));
416 return 1;
417 }
418 switch (sav->alg_enc) {
419 case SADB_EALG_3DESCBC:
420 /* weak key check */
421 if (des_is_weak_key((des_cblock *)_KEYBUF(sav->key_enc)) ||
422 des_is_weak_key((des_cblock *)(_KEYBUF(sav->key_enc) + 8)) ||
423 des_is_weak_key((des_cblock *)(_KEYBUF(sav->key_enc) + 16))) {
424 ipseclog((LOG_ERR,
425 "esp_cbc_mature %s: weak key was passed.\n",
426 algo->name));
427 return 1;
428 }
429 break;
430 case SADB_X_EALG_BLOWFISHCBC:
431 case SADB_X_EALG_CAST128CBC:
432 break;
433 case SADB_X_EALG_RIJNDAELCBC:
434 case SADB_X_EALG_CAMELLIACBC:
435 /* allows specific key sizes only */
436 if (!(keylen == 128 || keylen == 192 || keylen == 256)) {
437 ipseclog((LOG_ERR,
438 "esp_cbc_mature %s: invalid key length %d.\n",
439 algo->name, keylen));
440 return 1;
441 }
442 break;
443 }
444
445 return 0;
446 }
447
448 static size_t
449 esp_blowfish_schedlen(const struct esp_algorithm *algo)
450 {
451
452 return sizeof(BF_KEY);
453 }
454
455 static int
456 esp_blowfish_schedule(const struct esp_algorithm *algo, struct secasvar *sav)
457 {
458
459 BF_set_key((BF_KEY *)sav->sched, _KEYLEN(sav->key_enc),
460 _KEYBUF(sav->key_enc));
461 return 0;
462 }
463
464 static int
465 esp_blowfish_blockdecrypt(const struct esp_algorithm *algo,
466 struct secasvar *sav, u_int8_t *s, u_int8_t *d)
467 {
468
469 BF_ecb_encrypt(s, d, (BF_KEY *)sav->sched, 0);
470 return 0;
471 }
472
473 static int
474 esp_blowfish_blockencrypt(const struct esp_algorithm *algo,
475 struct secasvar *sav, u_int8_t *s, u_int8_t *d)
476 {
477
478 BF_ecb_encrypt(s, d, (BF_KEY *)sav->sched, 1);
479 return 0;
480 }
481
482 static size_t
483 esp_cast128_schedlen(const struct esp_algorithm *algo)
484 {
485
486 return sizeof(cast128_key);
487 }
488
489 static int
490 esp_cast128_schedule(const struct esp_algorithm *algo, struct secasvar *sav)
491 {
492
493 cast128_setkey((cast128_key *)sav->sched, _KEYBUF(sav->key_enc),
494 _KEYLEN(sav->key_enc));
495 return 0;
496 }
497
498 static int
499 esp_cast128_blockdecrypt(const struct esp_algorithm *algo,
500 struct secasvar *sav, u_int8_t *s, u_int8_t *d)
501 {
502
503 cast128_decrypt((cast128_key *)sav->sched, s, d);
504 return 0;
505 }
506
507 static int
508 esp_cast128_blockencrypt(const struct esp_algorithm *algo, struct secasvar *sav,
509 u_int8_t *s, u_int8_t *d)
510 {
511
512 cast128_encrypt((cast128_key *)sav->sched, s, d);
513 return 0;
514 }
515
516 static size_t
517 esp_3des_schedlen(const struct esp_algorithm *algo)
518 {
519
520 return sizeof(des_key_schedule) * 3;
521 }
522
523 static int
524 esp_3des_schedule(const struct esp_algorithm *algo, struct secasvar *sav)
525 {
526 int error;
527 des_key_schedule *p;
528 int i;
529 u_int8_t *k;
530
531 p = (des_key_schedule *)sav->sched;
532 k = _KEYBUF(sav->key_enc);
533 for (i = 0; i < 3; i++) {
534 error = des_key_sched((des_cblock *)(k + 8 * i), p[i]);
535 if (error)
536 return EINVAL;
537 }
538 return 0;
539 }
540
541 static int
542 esp_3des_blockdecrypt(const struct esp_algorithm *algo, struct secasvar *sav,
543 u_int8_t *s, u_int8_t *d)
544 {
545 des_key_schedule *p;
546
547 /* assumption: d has a good alignment */
548 p = (des_key_schedule *)sav->sched;
549 bcopy(s, d, sizeof(DES_LONG) * 2);
550 des_ecb3_encrypt((des_cblock *)d, (des_cblock *)d,
551 p[0], p[1], p[2], DES_DECRYPT);
552 return 0;
553 }
554
555 static int
556 esp_3des_blockencrypt(const struct esp_algorithm *algo, struct secasvar *sav,
557 u_int8_t *s, u_int8_t *d)
558 {
559 des_key_schedule *p;
560
561 /* assumption: d has a good alignment */
562 p = (des_key_schedule *)sav->sched;
563 bcopy(s, d, sizeof(DES_LONG) * 2);
564 des_ecb3_encrypt((des_cblock *)d, (des_cblock *)d,
565 p[0], p[1], p[2], DES_ENCRYPT);
566 return 0;
567 }
568
569 static int
570 esp_common_ivlen(const struct esp_algorithm *algo, struct secasvar *sav)
571 {
572
573 if (!algo)
574 panic("esp_common_ivlen: unknown algorithm");
575 return algo->ivlenval;
576 }
577
578 static int
579 esp_cbc_decrypt(struct mbuf *m, size_t off, struct secasvar *sav,
580 const struct esp_algorithm *algo, int ivlen)
581 {
582 struct mbuf *s;
583 struct mbuf *d, *d0, *dp;
584 int soff, doff; /* offset from the head of chain, to head of this mbuf */
585 int sn, dn; /* offset from the head of the mbuf, to meat */
586 size_t ivoff, bodyoff;
587 u_int8_t iv[MAXIVLEN], *ivp;
588 u_int8_t sbuf[MAXIVLEN], *sp;
589 u_int8_t *p, *q;
590 struct mbuf *scut;
591 int scutoff;
592 int i;
593 int blocklen;
594
595 if (ivlen != sav->ivlen || ivlen > sizeof(iv)) {
596 ipseclog((LOG_ERR, "esp_cbc_decrypt %s: "
597 "unsupported ivlen %d\n", algo->name, ivlen));
598 m_freem(m);
599 return EINVAL;
600 }
601
602 /* assumes blocklen == padbound */
603 blocklen = algo->padbound;
604
605 #ifdef DIAGNOSTIC
606 if (blocklen > sizeof(iv)) {
607 ipseclog((LOG_ERR, "esp_cbc_decrypt %s: "
608 "unsupported blocklen %d\n", algo->name, blocklen));
609 m_freem(m);
610 return EINVAL;
611 }
612 #endif
613
614 if (sav->flags & SADB_X_EXT_OLD) {
615 /* RFC 1827 */
616 ivoff = off + sizeof(struct esp);
617 bodyoff = off + sizeof(struct esp) + ivlen;
618 } else {
619 /* RFC 2406 */
620 if (sav->flags & SADB_X_EXT_DERIV) {
621 /*
622 * draft-ietf-ipsec-ciph-des-derived-00.txt
623 * uses sequence number field as IV field.
624 */
625 ivoff = off + sizeof(struct esp);
626 bodyoff = off + sizeof(struct esp) + sizeof(u_int32_t);
627 ivlen = sizeof(u_int32_t);
628 } else {
629 ivoff = off + sizeof(struct newesp);
630 bodyoff = off + sizeof(struct newesp) + ivlen;
631 }
632 }
633
634 /* grab iv */
635 m_copydata(m, ivoff, ivlen, (caddr_t)iv);
636
637 /* extend iv */
638 if (ivlen == blocklen)
639 ;
640 else if (ivlen == 4 && blocklen == 8) {
641 bcopy(&iv[0], &iv[4], 4);
642 iv[4] ^= 0xff;
643 iv[5] ^= 0xff;
644 iv[6] ^= 0xff;
645 iv[7] ^= 0xff;
646 } else {
647 ipseclog((LOG_ERR, "esp_cbc_encrypt %s: "
648 "unsupported ivlen/blocklen: %d %d\n",
649 algo->name, ivlen, blocklen));
650 m_freem(m);
651 return EINVAL;
652 }
653
654 if (m->m_pkthdr.len < bodyoff) {
655 ipseclog((LOG_ERR, "esp_cbc_decrypt %s: bad len %d/%lu\n",
656 algo->name, m->m_pkthdr.len, (unsigned long)bodyoff));
657 m_freem(m);
658 return EINVAL;
659 }
660 if ((m->m_pkthdr.len - bodyoff) % blocklen) {
661 ipseclog((LOG_ERR, "esp_cbc_decrypt %s: "
662 "payload length must be multiple of %d\n",
663 algo->name, blocklen));
664 m_freem(m);
665 return EINVAL;
666 }
667
668 s = m;
669 d = d0 = dp = NULL;
670 soff = doff = sn = dn = 0;
671 ivp = sp = NULL;
672
673 /* skip bodyoff */
674 while (soff < bodyoff) {
675 if (soff + s->m_len >= bodyoff) {
676 sn = bodyoff - soff;
677 break;
678 }
679
680 soff += s->m_len;
681 s = s->m_next;
682 }
683 scut = s;
684 scutoff = sn;
685
686 /* skip over empty mbuf */
687 while (s && s->m_len == 0)
688 s = s->m_next;
689
690 while (soff < m->m_pkthdr.len) {
691 /* source */
692 if (sn + blocklen <= s->m_len) {
693 /* body is continuous */
694 sp = mtod(s, u_int8_t *) + sn;
695 } else {
696 /* body is non-continuous */
697 m_copydata(s, sn, blocklen, sbuf);
698 sp = sbuf;
699 }
700
701 /* destination */
702 if (!d || dn + blocklen > d->m_len) {
703 if (d)
704 dp = d;
705 i = m->m_pkthdr.len - (soff + sn);
706 d = m_getb(i, M_NOWAIT, MT_DATA, 0);
707 if (!d) {
708 m_freem(m);
709 if (d0)
710 m_freem(d0);
711 return ENOBUFS;
712 }
713 if (!d0)
714 d0 = d;
715 if (dp)
716 dp->m_next = d;
717 d->m_len = 0;
718 d->m_len = rounddown(M_TRAILINGSPACE(d), blocklen);
719 if (d->m_len > i)
720 d->m_len = i;
721 dn = 0;
722 }
723
724 /* decrypt */
725 (*algo->blockdecrypt)(algo, sav, sp, mtod(d, u_int8_t *) + dn);
726
727 /* xor */
728 p = ivp ? ivp : iv;
729 q = mtod(d, u_int8_t *) + dn;
730 for (i = 0; i < blocklen; i++)
731 q[i] ^= p[i];
732
733 /* next iv */
734 if (sp == sbuf) {
735 bcopy(sbuf, iv, blocklen);
736 ivp = NULL;
737 } else
738 ivp = sp;
739
740 sn += blocklen;
741 dn += blocklen;
742
743 /* find the next source block */
744 while (s && sn >= s->m_len) {
745 sn -= s->m_len;
746 soff += s->m_len;
747 s = s->m_next;
748 }
749
750 /* skip over empty mbuf */
751 while (s && s->m_len == 0)
752 s = s->m_next;
753 }
754
755 m_freem(scut->m_next);
756 scut->m_len = scutoff;
757 scut->m_next = d0;
758
759 /* just in case */
760 bzero(iv, sizeof(iv));
761 bzero(sbuf, sizeof(sbuf));
762
763 return 0;
764 }
765
766 static int
767 esp_cbc_encrypt(struct mbuf *m, size_t off, size_t plen, struct secasvar *sav,
768 const struct esp_algorithm *algo, int ivlen)
769 {
770 struct mbuf *s;
771 struct mbuf *d, *d0, *dp;
772 int soff, doff; /* offset from the head of chain, to head of this mbuf */
773 int sn, dn; /* offset from the head of the mbuf, to meat */
774 size_t ivoff, bodyoff;
775 u_int8_t iv[MAXIVLEN], *ivp;
776 u_int8_t sbuf[MAXIVLEN], *sp;
777 u_int8_t *p, *q;
778 struct mbuf *scut;
779 int scutoff;
780 int i;
781 int blocklen;
782 int derived;
783
784 if (ivlen != sav->ivlen || ivlen > sizeof(iv)) {
785 ipseclog((LOG_ERR, "esp_cbc_encrypt %s: "
786 "unsupported ivlen %d\n", algo->name, ivlen));
787 m_freem(m);
788 return EINVAL;
789 }
790
791 /* assumes blocklen == padbound */
792 blocklen = algo->padbound;
793
794 #ifdef DIAGNOSTIC
795 if (blocklen > sizeof(iv)) {
796 ipseclog((LOG_ERR, "esp_cbc_encrypt %s: "
797 "unsupported blocklen %d\n", algo->name, blocklen));
798 m_freem(m);
799 return EINVAL;
800 }
801 #endif
802
803 if (sav->flags & SADB_X_EXT_OLD) {
804 /* RFC 1827 */
805 ivoff = off + sizeof(struct esp);
806 bodyoff = off + sizeof(struct esp) + ivlen;
807 derived = 0;
808 } else {
809 /* RFC 2406 */
810 if (sav->flags & SADB_X_EXT_DERIV) {
811 /*
812 * draft-ietf-ipsec-ciph-des-derived-00.txt
813 * uses sequence number field as IV field.
814 */
815 ivoff = off + sizeof(struct esp);
816 bodyoff = off + sizeof(struct esp) + sizeof(u_int32_t);
817 ivlen = sizeof(u_int32_t);
818 derived = 1;
819 } else {
820 ivoff = off + sizeof(struct newesp);
821 bodyoff = off + sizeof(struct newesp) + ivlen;
822 derived = 0;
823 }
824 }
825
826 /* put iv into the packet. if we are in derived mode, use seqno. */
827 if (derived)
828 m_copydata(m, ivoff, ivlen, (caddr_t)iv);
829 else {
830 bcopy(sav->iv, iv, ivlen);
831 /* maybe it is better to overwrite dest, not source */
832 m_copyback(m, ivoff, ivlen, (caddr_t)iv);
833 }
834
835 /* extend iv */
836 if (ivlen == blocklen)
837 ;
838 else if (ivlen == 4 && blocklen == 8) {
839 bcopy(&iv[0], &iv[4], 4);
840 iv[4] ^= 0xff;
841 iv[5] ^= 0xff;
842 iv[6] ^= 0xff;
843 iv[7] ^= 0xff;
844 } else {
845 ipseclog((LOG_ERR, "esp_cbc_encrypt %s: "
846 "unsupported ivlen/blocklen: %d %d\n",
847 algo->name, ivlen, blocklen));
848 m_freem(m);
849 return EINVAL;
850 }
851
852 if (m->m_pkthdr.len < bodyoff) {
853 ipseclog((LOG_ERR, "esp_cbc_encrypt %s: bad len %d/%lu\n",
854 algo->name, m->m_pkthdr.len, (unsigned long)bodyoff));
855 m_freem(m);
856 return EINVAL;
857 }
858 if ((m->m_pkthdr.len - bodyoff) % blocklen) {
859 ipseclog((LOG_ERR, "esp_cbc_encrypt %s: "
860 "payload length must be multiple of %lu\n",
861 algo->name, (unsigned long)algo->padbound));
862 m_freem(m);
863 return EINVAL;
864 }
865
866 s = m;
867 d = d0 = dp = NULL;
868 soff = doff = sn = dn = 0;
869 ivp = sp = NULL;
870
871 /* skip bodyoff */
872 while (soff < bodyoff) {
873 if (soff + s->m_len >= bodyoff) {
874 sn = bodyoff - soff;
875 break;
876 }
877
878 soff += s->m_len;
879 s = s->m_next;
880 }
881 scut = s;
882 scutoff = sn;
883
884 /* skip over empty mbuf */
885 while (s && s->m_len == 0)
886 s = s->m_next;
887
888 while (soff < m->m_pkthdr.len) {
889 /* source */
890 if (sn + blocklen <= s->m_len) {
891 /* body is continuous */
892 sp = mtod(s, u_int8_t *) + sn;
893 } else {
894 /* body is non-continuous */
895 m_copydata(s, sn, blocklen, (caddr_t)sbuf);
896 sp = sbuf;
897 }
898
899 /* destination */
900 if (!d || dn + blocklen > d->m_len) {
901 if (d)
902 dp = d;
903 i = m->m_pkthdr.len - (soff + sn);
904 d = m_getb(i, M_NOWAIT, MT_DATA, 0);
905 if (!d) {
906 m_freem(m);
907 if (d0)
908 m_freem(d0);
909 return ENOBUFS;
910 }
911 if (!d0)
912 d0 = d;
913 if (dp)
914 dp->m_next = d;
915 d->m_len = 0;
916 d->m_len = rounddown(M_TRAILINGSPACE(d), blocklen);
917 if (d->m_len > i)
918 d->m_len = i;
919 dn = 0;
920 }
921
922 /* xor */
923 p = ivp ? ivp : iv;
924 q = sp;
925 for (i = 0; i < blocklen; i++)
926 q[i] ^= p[i];
927
928 /* encrypt */
929 (*algo->blockencrypt)(algo, sav, sp, mtod(d, u_int8_t *) + dn);
930
931 /* next iv */
932 ivp = mtod(d, u_int8_t *) + dn;
933
934 sn += blocklen;
935 dn += blocklen;
936
937 /* find the next source block */
938 while (s && sn >= s->m_len) {
939 sn -= s->m_len;
940 soff += s->m_len;
941 s = s->m_next;
942 }
943
944 /* skip over empty mbuf */
945 while (s && s->m_len == 0)
946 s = s->m_next;
947 }
948
949 m_freem(scut->m_next);
950 scut->m_len = scutoff;
951 scut->m_next = d0;
952
953 /* just in case */
954 bzero(iv, sizeof(iv));
955 bzero(sbuf, sizeof(sbuf));
956
957 key_sa_stir_iv(sav);
958
959 return 0;
960 }
961
962 /*------------------------------------------------------------*/
963
964 /* does not free m0 on error */
965 int
966 esp_auth(struct mbuf *m0,
967 size_t skip, /* offset to ESP header */
968 size_t length, /* payload length */
969 struct secasvar *sav, u_char *sum)
970 {
971 struct mbuf *m;
972 size_t off;
973 struct ah_algorithm_state s;
974 u_char sumbuf[AH_MAXSUMSIZE];
975 const struct ah_algorithm *algo;
976 size_t siz;
977 int error;
978
979 /* sanity checks */
980 if (m0->m_pkthdr.len < skip) {
981 ipseclog((LOG_DEBUG, "esp_auth: mbuf length < skip\n"));
982 return EINVAL;
983 }
984 if (m0->m_pkthdr.len < skip + length) {
985 ipseclog((LOG_DEBUG,
986 "esp_auth: mbuf length < skip + length\n"));
987 return EINVAL;
988 }
989 /*
990 * length of esp part (excluding authentication data) must be 4n,
991 * since nexthdr must be at offset 4n+3.
992 */
993 if (length % 4) {
994 ipseclog((LOG_ERR, "esp_auth: length is not multiple of 4\n"));
995 return EINVAL;
996 }
997 if (!sav) {
998 ipseclog((LOG_DEBUG, "esp_auth: NULL SA passed\n"));
999 return EINVAL;
1000 }
1001 algo = ah_algorithm_lookup(sav->alg_auth);
1002 if (!algo) {
1003 ipseclog((LOG_ERR,
1004 "esp_auth: bad ESP auth algorithm passed: %d\n",
1005 sav->alg_auth));
1006 return EINVAL;
1007 }
1008
1009 m = m0;
1010 off = 0;
1011
1012 siz = (((*algo->sumsiz)(sav) + 3) & ~(4 - 1));
1013 if (sizeof(sumbuf) < siz) {
1014 ipseclog((LOG_DEBUG,
1015 "esp_auth: AH_MAXSUMSIZE is too small: siz=%lu\n",
1016 (u_long)siz));
1017 return EINVAL;
1018 }
1019
1020 /* skip the header */
1021 while (skip) {
1022 if (!m)
1023 panic("mbuf chain?");
1024 if (m->m_len <= skip) {
1025 skip -= m->m_len;
1026 m = m->m_next;
1027 off = 0;
1028 } else {
1029 off = skip;
1030 skip = 0;
1031 }
1032 }
1033
1034 error = (*algo->init)(&s, sav);
1035 if (error)
1036 return error;
1037
1038 while (0 < length) {
1039 if (!m)
1040 panic("mbuf chain?");
1041
1042 if (m->m_len - off < length) {
1043 (*algo->update)(&s, mtod(m, u_char *) + off,
1044 m->m_len - off);
1045 length -= m->m_len - off;
1046 m = m->m_next;
1047 off = 0;
1048 } else {
1049 (*algo->update)(&s, mtod(m, u_char *) + off, length);
1050 break;
1051 }
1052 }
1053 (*algo->result)(&s, sumbuf);
1054 bcopy(sumbuf, sum, siz); /* XXX */
1055
1056 return 0;
1057 }
DragonFly BSD