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1/* $OpenBSD: ssl_ciph.c,v 1.81 2015/02/07 04:17:11 jsing Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58/* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111/* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 * ECC cipher suite support in OpenSSL originally developed by
114 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
115 */
116/* ====================================================================
117 * Copyright 2005 Nokia. All rights reserved.
118 *
119 * The portions of the attached software ("Contribution") is developed by
120 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
121 * license.
122 *
123 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
124 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
125 * support (see RFC 4279) to OpenSSL.
126 *
127 * No patent licenses or other rights except those expressly stated in
128 * the OpenSSL open source license shall be deemed granted or received
129 * expressly, by implication, estoppel, or otherwise.
130 *
131 * No assurances are provided by Nokia that the Contribution does not
132 * infringe the patent or other intellectual property rights of any third
133 * party or that the license provides you with all the necessary rights
134 * to make use of the Contribution.
135 *
136 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
137 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
138 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
139 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
140 * OTHERWISE.
141 */
142
143#include <stdio.h>
144
145#include <openssl/objects.h>
146
147#ifndef OPENSSL_NO_ENGINE
148#include <openssl/engine.h>
149#endif
150
151#include "ssl_locl.h"
152
153#define SSL_ENC_DES_IDX 0
154#define SSL_ENC_3DES_IDX 1
155#define SSL_ENC_RC4_IDX 2
156#define SSL_ENC_IDEA_IDX 3
157#define SSL_ENC_NULL_IDX 4
158#define SSL_ENC_AES128_IDX 5
159#define SSL_ENC_AES256_IDX 6
160#define SSL_ENC_CAMELLIA128_IDX 7
161#define SSL_ENC_CAMELLIA256_IDX 8
162#define SSL_ENC_GOST89_IDX 9
163#define SSL_ENC_AES128GCM_IDX 10
164#define SSL_ENC_AES256GCM_IDX 11
165#define SSL_ENC_NUM_IDX 12
166
167
168static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX] = {
169 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
170};
171
172#define SSL_MD_MD5_IDX 0
173#define SSL_MD_SHA1_IDX 1
174#define SSL_MD_GOST94_IDX 2
175#define SSL_MD_GOST89MAC_IDX 3
176#define SSL_MD_SHA256_IDX 4
177#define SSL_MD_SHA384_IDX 5
178#define SSL_MD_STREEBOG256_IDX 6
179#define SSL_MD_STREEBOG512_IDX 7
180/*Constant SSL_MAX_DIGEST equal to size of digests array should be
181 * defined in the
182 * ssl_locl.h */
183#define SSL_MD_NUM_IDX SSL_MAX_DIGEST
184static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX] = {
185 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
186};
187
188static int ssl_mac_pkey_id[SSL_MD_NUM_IDX] = {
189 EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_GOSTIMIT,
190 EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_HMAC,
191};
192
193static int ssl_mac_secret_size[SSL_MD_NUM_IDX] = {
194 0, 0, 0, 0, 0, 0, 0, 0
195};
196
197static int ssl_handshake_digest_flag[SSL_MD_NUM_IDX] = {
198 SSL_HANDSHAKE_MAC_MD5, SSL_HANDSHAKE_MAC_SHA,
199 SSL_HANDSHAKE_MAC_GOST94, 0, SSL_HANDSHAKE_MAC_SHA256,
200 SSL_HANDSHAKE_MAC_SHA384, SSL_HANDSHAKE_MAC_STREEBOG256,
201 SSL_HANDSHAKE_MAC_STREEBOG512
202};
203
204#define CIPHER_ADD 1
205#define CIPHER_KILL 2
206#define CIPHER_DEL 3
207#define CIPHER_ORD 4
208#define CIPHER_SPECIAL 5
209
210typedef struct cipher_order_st {
211 const SSL_CIPHER *cipher;
212 int active;
213 int dead;
214 struct cipher_order_st *next, *prev;
215} CIPHER_ORDER;
216
217static const SSL_CIPHER cipher_aliases[] = {
218
219 /* "ALL" doesn't include eNULL (must be specifically enabled) */
220 {
221 .name = SSL_TXT_ALL,
222 .algorithm_enc = ~SSL_eNULL,
223 },
224
225 /* "COMPLEMENTOFALL" */
226 {
227 .name = SSL_TXT_CMPALL,
228 .algorithm_enc = SSL_eNULL,
229 },
230
231 /*
232 * "COMPLEMENTOFDEFAULT"
233 * (does *not* include ciphersuites not found in ALL!)
234 */
235 {
236 .name = SSL_TXT_CMPDEF,
237 .algorithm_mkey = SSL_kDHE|SSL_kECDHE,
238 .algorithm_auth = SSL_aNULL,
239 .algorithm_enc = ~SSL_eNULL,
240 },
241
242 /*
243 * key exchange aliases
244 * (some of those using only a single bit here combine multiple key
245 * exchange algs according to the RFCs, e.g. kEDH combines DHE_DSS
246 * and DHE_RSA)
247 */
248 {
249 .name = SSL_TXT_kRSA,
250 .algorithm_mkey = SSL_kRSA,
251 },
252 {
253 .name = SSL_TXT_kEDH,
254 .algorithm_mkey = SSL_kDHE,
255 },
256 {
257 .name = SSL_TXT_DH,
258 .algorithm_mkey = SSL_kDHE,
259 },
260
261 {
262 .name = SSL_TXT_kECDHr,
263 .algorithm_mkey = SSL_kECDHr,
264 },
265 {
266 .name = SSL_TXT_kECDHe,
267 .algorithm_mkey = SSL_kECDHe,
268 },
269 {
270 .name = SSL_TXT_kECDH,
271 .algorithm_mkey = SSL_kECDHr|SSL_kECDHe,
272 },
273 {
274 .name = SSL_TXT_kEECDH,
275 .algorithm_mkey = SSL_kECDHE,
276 },
277 {
278 .name = SSL_TXT_ECDH,
279 .algorithm_mkey = SSL_kECDHr|SSL_kECDHe|SSL_kECDHE,
280 },
281
282 {
283 .name = SSL_TXT_kGOST,
284 .algorithm_mkey = SSL_kGOST,
285 },
286
287 /* server authentication aliases */
288 {
289 .name = SSL_TXT_aRSA,
290 .algorithm_auth = SSL_aRSA,
291 },
292 {
293 .name = SSL_TXT_aDSS,
294 .algorithm_auth = SSL_aDSS,
295 },
296 {
297 .name = SSL_TXT_DSS,
298 .algorithm_auth = SSL_aDSS,
299 },
300 {
301 .name = SSL_TXT_aNULL,
302 .algorithm_auth = SSL_aNULL,
303 },
304 {
305 .name = SSL_TXT_aECDH,
306 .algorithm_auth = SSL_aECDH,
307 },
308 {
309 .name = SSL_TXT_aECDSA,
310 .algorithm_auth = SSL_aECDSA,
311 },
312 {
313 .name = SSL_TXT_ECDSA,
314 .algorithm_auth = SSL_aECDSA,
315 },
316 {
317 .name = SSL_TXT_aGOST01,
318 .algorithm_auth = SSL_aGOST01,
319 },
320 {
321 .name = SSL_TXT_aGOST,
322 .algorithm_auth = SSL_aGOST01,
323 },
324
325 /* aliases combining key exchange and server authentication */
326 {
327 .name = SSL_TXT_DHE,
328 .algorithm_mkey = SSL_kDHE,
329 .algorithm_auth = ~SSL_aNULL,
330 },
331 {
332 .name = SSL_TXT_EDH,
333 .algorithm_mkey = SSL_kDHE,
334 .algorithm_auth = ~SSL_aNULL,
335 },
336 {
337 .name = SSL_TXT_ECDHE,
338 .algorithm_mkey = SSL_kECDHE,
339 .algorithm_auth = ~SSL_aNULL,
340 },
341 {
342 .name = SSL_TXT_EECDH,
343 .algorithm_mkey = SSL_kECDHE,
344 .algorithm_auth = ~SSL_aNULL,
345 },
346 {
347 .name = SSL_TXT_NULL,
348 .algorithm_enc = SSL_eNULL,
349 },
350 {
351 .name = SSL_TXT_RSA,
352 .algorithm_mkey = SSL_kRSA,
353 .algorithm_auth = SSL_aRSA,
354 },
355 {
356 .name = SSL_TXT_ADH,
357 .algorithm_mkey = SSL_kDHE,
358 .algorithm_auth = SSL_aNULL,
359 },
360 {
361 .name = SSL_TXT_AECDH,
362 .algorithm_mkey = SSL_kECDHE,
363 .algorithm_auth = SSL_aNULL,
364 },
365
366 /* symmetric encryption aliases */
367 {
368 .name = SSL_TXT_DES,
369 .algorithm_enc = SSL_DES,
370 },
371 {
372 .name = SSL_TXT_3DES,
373 .algorithm_enc = SSL_3DES,
374 },
375 {
376 .name = SSL_TXT_RC4,
377 .algorithm_enc = SSL_RC4,
378 },
379 {
380 .name = SSL_TXT_IDEA,
381 .algorithm_enc = SSL_IDEA,
382 },
383 {
384 .name = SSL_TXT_eNULL,
385 .algorithm_enc = SSL_eNULL,
386 },
387 {
388 .name = SSL_TXT_AES128,
389 .algorithm_enc = SSL_AES128|SSL_AES128GCM,
390 },
391 {
392 .name = SSL_TXT_AES256,
393 .algorithm_enc = SSL_AES256|SSL_AES256GCM,
394 },
395 {
396 .name = SSL_TXT_AES,
397 .algorithm_enc = SSL_AES,
398 },
399 {
400 .name = SSL_TXT_AES_GCM,
401 .algorithm_enc = SSL_AES128GCM|SSL_AES256GCM,
402 },
403 {
404 .name = SSL_TXT_CAMELLIA128,
405 .algorithm_enc = SSL_CAMELLIA128,
406 },
407 {
408 .name = SSL_TXT_CAMELLIA256,
409 .algorithm_enc = SSL_CAMELLIA256,
410 },
411 {
412 .name = SSL_TXT_CAMELLIA,
413 .algorithm_enc = SSL_CAMELLIA128|SSL_CAMELLIA256,
414 },
415 {
416 .name = SSL_TXT_CHACHA20,
417 .algorithm_enc = SSL_CHACHA20POLY1305,
418 },
419
420 /* MAC aliases */
421 {
422 .name = SSL_TXT_AEAD,
423 .algorithm_mac = SSL_AEAD,
424 },
425 {
426 .name = SSL_TXT_MD5,
427 .algorithm_mac = SSL_MD5,
428 },
429 {
430 .name = SSL_TXT_SHA1,
431 .algorithm_mac = SSL_SHA1,
432 },
433 {
434 .name = SSL_TXT_SHA,
435 .algorithm_mac = SSL_SHA1,
436 },
437 {
438 .name = SSL_TXT_GOST94,
439 .algorithm_mac = SSL_GOST94,
440 },
441 {
442 .name = SSL_TXT_GOST89MAC,
443 .algorithm_mac = SSL_GOST89MAC,
444 },
445 {
446 .name = SSL_TXT_SHA256,
447 .algorithm_mac = SSL_SHA256,
448 },
449 {
450 .name = SSL_TXT_SHA384,
451 .algorithm_mac = SSL_SHA384,
452 },
453 {
454 .name = SSL_TXT_STREEBOG256,
455 .algorithm_mac = SSL_STREEBOG256,
456 },
457 {
458 .name = SSL_TXT_STREEBOG512,
459 .algorithm_mac = SSL_STREEBOG512,
460 },
461
462 /* protocol version aliases */
463 {
464 .name = SSL_TXT_SSLV3,
465 .algorithm_ssl = SSL_SSLV3,
466 },
467 {
468 .name = SSL_TXT_TLSV1,
469 .algorithm_ssl = SSL_TLSV1,
470 },
471 {
472 .name = SSL_TXT_TLSV1_2,
473 .algorithm_ssl = SSL_TLSV1_2,
474 },
475
476 /* strength classes */
477 {
478 .name = SSL_TXT_LOW,
479 .algo_strength = SSL_LOW,
480 },
481 {
482 .name = SSL_TXT_MEDIUM,
483 .algo_strength = SSL_MEDIUM,
484 },
485 {
486 .name = SSL_TXT_HIGH,
487 .algo_strength = SSL_HIGH,
488 },
489};
490
491void
492ssl_load_ciphers(void)
493{
494 ssl_cipher_methods[SSL_ENC_DES_IDX] =
495 EVP_get_cipherbyname(SN_des_cbc);
496 ssl_cipher_methods[SSL_ENC_3DES_IDX] =
497 EVP_get_cipherbyname(SN_des_ede3_cbc);
498 ssl_cipher_methods[SSL_ENC_RC4_IDX] =
499 EVP_get_cipherbyname(SN_rc4);
500#ifndef OPENSSL_NO_IDEA
501 ssl_cipher_methods[SSL_ENC_IDEA_IDX] =
502 EVP_get_cipherbyname(SN_idea_cbc);
503#else
504 ssl_cipher_methods[SSL_ENC_IDEA_IDX] = NULL;
505#endif
506 ssl_cipher_methods[SSL_ENC_AES128_IDX] =
507 EVP_get_cipherbyname(SN_aes_128_cbc);
508 ssl_cipher_methods[SSL_ENC_AES256_IDX] =
509 EVP_get_cipherbyname(SN_aes_256_cbc);
510 ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] =
511 EVP_get_cipherbyname(SN_camellia_128_cbc);
512 ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] =
513 EVP_get_cipherbyname(SN_camellia_256_cbc);
514 ssl_cipher_methods[SSL_ENC_GOST89_IDX] =
515 EVP_get_cipherbyname(SN_gost89_cnt);
516
517 ssl_cipher_methods[SSL_ENC_AES128GCM_IDX] =
518 EVP_get_cipherbyname(SN_aes_128_gcm);
519 ssl_cipher_methods[SSL_ENC_AES256GCM_IDX] =
520 EVP_get_cipherbyname(SN_aes_256_gcm);
521
522 ssl_digest_methods[SSL_MD_MD5_IDX] =
523 EVP_get_digestbyname(SN_md5);
524 ssl_mac_secret_size[SSL_MD_MD5_IDX] =
525 EVP_MD_size(ssl_digest_methods[SSL_MD_MD5_IDX]);
526 OPENSSL_assert(ssl_mac_secret_size[SSL_MD_MD5_IDX] >= 0);
527 ssl_digest_methods[SSL_MD_SHA1_IDX] =
528 EVP_get_digestbyname(SN_sha1);
529 ssl_mac_secret_size[SSL_MD_SHA1_IDX] =
530 EVP_MD_size(ssl_digest_methods[SSL_MD_SHA1_IDX]);
531 OPENSSL_assert(ssl_mac_secret_size[SSL_MD_SHA1_IDX] >= 0);
532 ssl_digest_methods[SSL_MD_GOST94_IDX] =
533 EVP_get_digestbyname(SN_id_GostR3411_94);
534 if (ssl_digest_methods[SSL_MD_GOST94_IDX]) {
535 ssl_mac_secret_size[SSL_MD_GOST94_IDX] =
536 EVP_MD_size(ssl_digest_methods[SSL_MD_GOST94_IDX]);
537 OPENSSL_assert(ssl_mac_secret_size[SSL_MD_GOST94_IDX] >= 0);
538 }
539 ssl_digest_methods[SSL_MD_GOST89MAC_IDX] =
540 EVP_get_digestbyname(SN_id_Gost28147_89_MAC);
541 if (ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX]) {
542 ssl_mac_secret_size[SSL_MD_GOST89MAC_IDX] = 32;
543 }
544
545 ssl_digest_methods[SSL_MD_SHA256_IDX] =
546 EVP_get_digestbyname(SN_sha256);
547 ssl_mac_secret_size[SSL_MD_SHA256_IDX] =
548 EVP_MD_size(ssl_digest_methods[SSL_MD_SHA256_IDX]);
549 ssl_digest_methods[SSL_MD_SHA384_IDX] =
550 EVP_get_digestbyname(SN_sha384);
551 ssl_mac_secret_size[SSL_MD_SHA384_IDX] =
552 EVP_MD_size(ssl_digest_methods[SSL_MD_SHA384_IDX]);
553 ssl_digest_methods[SSL_MD_STREEBOG256_IDX] =
554 EVP_get_digestbyname(SN_id_tc26_gost3411_2012_256);
555 ssl_mac_secret_size[SSL_MD_STREEBOG256_IDX] =
556 EVP_MD_size(ssl_digest_methods[SSL_MD_STREEBOG256_IDX]);
557 ssl_digest_methods[SSL_MD_STREEBOG512_IDX] =
558 EVP_get_digestbyname(SN_id_tc26_gost3411_2012_512);
559 ssl_mac_secret_size[SSL_MD_STREEBOG512_IDX] =
560 EVP_MD_size(ssl_digest_methods[SSL_MD_STREEBOG512_IDX]);
561}
562
563int
564ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc,
565 const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size)
566{
567 const SSL_CIPHER *c;
568 int i;
569
570 c = s->cipher;
571 if (c == NULL)
572 return (0);
573
574 /*
575 * This function does not handle EVP_AEAD.
576 * See ssl_cipher_get_aead_evp instead.
577 */
578 if (c->algorithm2 & SSL_CIPHER_ALGORITHM2_AEAD)
579 return(0);
580
581 if ((enc == NULL) || (md == NULL))
582 return (0);
583
584 switch (c->algorithm_enc) {
585 case SSL_DES:
586 i = SSL_ENC_DES_IDX;
587 break;
588 case SSL_3DES:
589 i = SSL_ENC_3DES_IDX;
590 break;
591 case SSL_RC4:
592 i = SSL_ENC_RC4_IDX;
593 break;
594 case SSL_IDEA:
595 i = SSL_ENC_IDEA_IDX;
596 break;
597 case SSL_eNULL:
598 i = SSL_ENC_NULL_IDX;
599 break;
600 case SSL_AES128:
601 i = SSL_ENC_AES128_IDX;
602 break;
603 case SSL_AES256:
604 i = SSL_ENC_AES256_IDX;
605 break;
606 case SSL_CAMELLIA128:
607 i = SSL_ENC_CAMELLIA128_IDX;
608 break;
609 case SSL_CAMELLIA256:
610 i = SSL_ENC_CAMELLIA256_IDX;
611 break;
612 case SSL_eGOST2814789CNT:
613 i = SSL_ENC_GOST89_IDX;
614 break;
615 case SSL_AES128GCM:
616 i = SSL_ENC_AES128GCM_IDX;
617 break;
618 case SSL_AES256GCM:
619 i = SSL_ENC_AES256GCM_IDX;
620 break;
621 default:
622 i = -1;
623 break;
624 }
625
626 if ((i < 0) || (i >= SSL_ENC_NUM_IDX))
627 *enc = NULL;
628 else {
629 if (i == SSL_ENC_NULL_IDX)
630 *enc = EVP_enc_null();
631 else
632 *enc = ssl_cipher_methods[i];
633 }
634
635 switch (c->algorithm_mac) {
636 case SSL_MD5:
637 i = SSL_MD_MD5_IDX;
638 break;
639 case SSL_SHA1:
640 i = SSL_MD_SHA1_IDX;
641 break;
642 case SSL_SHA256:
643 i = SSL_MD_SHA256_IDX;
644 break;
645 case SSL_SHA384:
646 i = SSL_MD_SHA384_IDX;
647 break;
648 case SSL_GOST94:
649 i = SSL_MD_GOST94_IDX;
650 break;
651 case SSL_GOST89MAC:
652 i = SSL_MD_GOST89MAC_IDX;
653 break;
654 case SSL_STREEBOG256:
655 i = SSL_MD_STREEBOG256_IDX;
656 break;
657 case SSL_STREEBOG512:
658 i = SSL_MD_STREEBOG512_IDX;
659 break;
660 default:
661 i = -1;
662 break;
663 }
664 if ((i < 0) || (i >= SSL_MD_NUM_IDX)) {
665 *md = NULL;
666
667 if (mac_pkey_type != NULL)
668 *mac_pkey_type = NID_undef;
669 if (mac_secret_size != NULL)
670 *mac_secret_size = 0;
671 if (c->algorithm_mac == SSL_AEAD)
672 mac_pkey_type = NULL;
673 } else {
674 *md = ssl_digest_methods[i];
675 if (mac_pkey_type != NULL)
676 *mac_pkey_type = ssl_mac_pkey_id[i];
677 if (mac_secret_size != NULL)
678 *mac_secret_size = ssl_mac_secret_size[i];
679 }
680
681 if ((*enc != NULL) &&
682 (*md != NULL || (EVP_CIPHER_flags(*enc)&EVP_CIPH_FLAG_AEAD_CIPHER)) &&
683 (!mac_pkey_type || *mac_pkey_type != NID_undef)) {
684 const EVP_CIPHER *evp;
685
686 if (s->ssl_version >> 8 != TLS1_VERSION_MAJOR ||
687 s->ssl_version < TLS1_VERSION)
688 return 1;
689
690 if (c->algorithm_enc == SSL_RC4 &&
691 c->algorithm_mac == SSL_MD5 &&
692 (evp = EVP_get_cipherbyname("RC4-HMAC-MD5")))
693 *enc = evp, *md = NULL;
694 else if (c->algorithm_enc == SSL_AES128 &&
695 c->algorithm_mac == SSL_SHA1 &&
696 (evp = EVP_get_cipherbyname("AES-128-CBC-HMAC-SHA1")))
697 *enc = evp, *md = NULL;
698 else if (c->algorithm_enc == SSL_AES256 &&
699 c->algorithm_mac == SSL_SHA1 &&
700 (evp = EVP_get_cipherbyname("AES-256-CBC-HMAC-SHA1")))
701 *enc = evp, *md = NULL;
702 return (1);
703 } else
704 return (0);
705}
706
707/*
708 * ssl_cipher_get_evp_aead sets aead to point to the correct EVP_AEAD object
709 * for s->cipher. It returns 1 on success and 0 on error.
710 */
711int
712ssl_cipher_get_evp_aead(const SSL_SESSION *s, const EVP_AEAD **aead)
713{
714 const SSL_CIPHER *c = s->cipher;
715
716 *aead = NULL;
717
718 if (c == NULL)
719 return 0;
720 if ((c->algorithm2 & SSL_CIPHER_ALGORITHM2_AEAD) == 0)
721 return 0;
722
723 switch (c->algorithm_enc) {
724#ifndef OPENSSL_NO_AES
725 case SSL_AES128GCM:
726 *aead = EVP_aead_aes_128_gcm();
727 return 1;
728 case SSL_AES256GCM:
729 *aead = EVP_aead_aes_256_gcm();
730 return 1;
731#endif
732#if !defined(OPENSSL_NO_CHACHA) && !defined(OPENSSL_NO_POLY1305)
733 case SSL_CHACHA20POLY1305:
734 *aead = EVP_aead_chacha20_poly1305();
735 return 1;
736#endif
737 default:
738 break;
739 }
740 return 0;
741}
742
743int
744ssl_get_handshake_digest(int idx, long *mask, const EVP_MD **md)
745{
746 if (idx < 0 || idx >= SSL_MD_NUM_IDX) {
747 return 0;
748 }
749 *mask = ssl_handshake_digest_flag[idx];
750 if (*mask)
751 *md = ssl_digest_methods[idx];
752 else
753 *md = NULL;
754 return 1;
755}
756
757#define ITEM_SEP(a) \
758 (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
759
760static void
761ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
762 CIPHER_ORDER **tail)
763{
764 if (curr == *tail)
765 return;
766 if (curr == *head)
767 *head = curr->next;
768 if (curr->prev != NULL)
769 curr->prev->next = curr->next;
770 if (curr->next != NULL)
771 curr->next->prev = curr->prev;
772 (*tail)->next = curr;
773 curr->prev= *tail;
774 curr->next = NULL;
775 *tail = curr;
776}
777
778static void
779ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr,
780 CIPHER_ORDER **tail)
781{
782 if (curr == *head)
783 return;
784 if (curr == *tail)
785 *tail = curr->prev;
786 if (curr->next != NULL)
787 curr->next->prev = curr->prev;
788 if (curr->prev != NULL)
789 curr->prev->next = curr->next;
790 (*head)->prev = curr;
791 curr->next= *head;
792 curr->prev = NULL;
793 *head = curr;
794}
795
796static void
797ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth,
798 unsigned long *enc, unsigned long *mac, unsigned long *ssl)
799{
800 *mkey = 0;
801 *auth = 0;
802 *enc = 0;
803 *mac = 0;
804 *ssl = 0;
805
806 /*
807 * Check for the availability of GOST 34.10 public/private key
808 * algorithms. If they are not available disable the associated
809 * authentication and key exchange algorithms.
810 */
811 if (EVP_PKEY_meth_find(NID_id_GostR3410_2001) == NULL) {
812 *auth |= SSL_aGOST01;
813 *mkey |= SSL_kGOST;
814 }
815
816#ifdef SSL_FORBID_ENULL
817 *enc |= SSL_eNULL;
818#endif
819
820 *enc |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES : 0;
821 *enc |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES : 0;
822 *enc |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 : 0;
823 *enc |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA : 0;
824 *enc |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES128 : 0;
825 *enc |= (ssl_cipher_methods[SSL_ENC_AES256_IDX] == NULL) ? SSL_AES256 : 0;
826 *enc |= (ssl_cipher_methods[SSL_ENC_AES128GCM_IDX] == NULL) ? SSL_AES128GCM : 0;
827 *enc |= (ssl_cipher_methods[SSL_ENC_AES256GCM_IDX] == NULL) ? SSL_AES256GCM : 0;
828 *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] == NULL) ? SSL_CAMELLIA128 : 0;
829 *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] == NULL) ? SSL_CAMELLIA256 : 0;
830 *enc |= (ssl_cipher_methods[SSL_ENC_GOST89_IDX] == NULL) ? SSL_eGOST2814789CNT : 0;
831
832 *mac |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 : 0;
833 *mac |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1 : 0;
834 *mac |= (ssl_digest_methods[SSL_MD_SHA256_IDX] == NULL) ? SSL_SHA256 : 0;
835 *mac |= (ssl_digest_methods[SSL_MD_SHA384_IDX] == NULL) ? SSL_SHA384 : 0;
836 *mac |= (ssl_digest_methods[SSL_MD_GOST94_IDX] == NULL) ? SSL_GOST94 : 0;
837 *mac |= (ssl_digest_methods[SSL_MD_GOST89MAC_IDX] == NULL) ? SSL_GOST89MAC : 0;
838 *mac |= (ssl_digest_methods[SSL_MD_STREEBOG256_IDX] == NULL) ? SSL_STREEBOG256 : 0;
839 *mac |= (ssl_digest_methods[SSL_MD_STREEBOG512_IDX] == NULL) ? SSL_STREEBOG512 : 0;
840
841}
842
843static void
844ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method, int num_of_ciphers,
845 unsigned long disabled_mkey, unsigned long disabled_auth,
846 unsigned long disabled_enc, unsigned long disabled_mac,
847 unsigned long disabled_ssl, CIPHER_ORDER *co_list,
848 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
849{
850 int i, co_list_num;
851 const SSL_CIPHER *c;
852
853 /*
854 * We have num_of_ciphers descriptions compiled in, depending on the
855 * method selected (SSLv3, TLSv1, etc). These will later be sorted in
856 * a linked list with at most num entries.
857 */
858
859 /* Get the initial list of ciphers */
860 co_list_num = 0; /* actual count of ciphers */
861 for (i = 0; i < num_of_ciphers; i++) {
862 c = ssl_method->get_cipher(i);
863 /* drop those that use any of that is not available */
864 if ((c != NULL) && c->valid &&
865 !(c->algorithm_mkey & disabled_mkey) &&
866 !(c->algorithm_auth & disabled_auth) &&
867 !(c->algorithm_enc & disabled_enc) &&
868 !(c->algorithm_mac & disabled_mac) &&
869 !(c->algorithm_ssl & disabled_ssl)) {
870 co_list[co_list_num].cipher = c;
871 co_list[co_list_num].next = NULL;
872 co_list[co_list_num].prev = NULL;
873 co_list[co_list_num].active = 0;
874 co_list_num++;
875 /*
876 if (!sk_push(ca_list,(char *)c)) goto err;
877 */
878 }
879 }
880
881 /*
882 * Prepare linked list from list entries
883 */
884 if (co_list_num > 0) {
885 co_list[0].prev = NULL;
886
887 if (co_list_num > 1) {
888 co_list[0].next = &co_list[1];
889
890 for (i = 1; i < co_list_num - 1; i++) {
891 co_list[i].prev = &co_list[i - 1];
892 co_list[i].next = &co_list[i + 1];
893 }
894
895 co_list[co_list_num - 1].prev =
896 &co_list[co_list_num - 2];
897 }
898
899 co_list[co_list_num - 1].next = NULL;
900
901 *head_p = &co_list[0];
902 *tail_p = &co_list[co_list_num - 1];
903 }
904}
905
906static void
907ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list, int num_of_group_aliases,
908 unsigned long disabled_mkey, unsigned long disabled_auth,
909 unsigned long disabled_enc, unsigned long disabled_mac,
910 unsigned long disabled_ssl, CIPHER_ORDER *head)
911{
912 CIPHER_ORDER *ciph_curr;
913 const SSL_CIPHER **ca_curr;
914 int i;
915 unsigned long mask_mkey = ~disabled_mkey;
916 unsigned long mask_auth = ~disabled_auth;
917 unsigned long mask_enc = ~disabled_enc;
918 unsigned long mask_mac = ~disabled_mac;
919 unsigned long mask_ssl = ~disabled_ssl;
920
921 /*
922 * First, add the real ciphers as already collected
923 */
924 ciph_curr = head;
925 ca_curr = ca_list;
926 while (ciph_curr != NULL) {
927 *ca_curr = ciph_curr->cipher;
928 ca_curr++;
929 ciph_curr = ciph_curr->next;
930 }
931
932 /*
933 * Now we add the available ones from the cipher_aliases[] table.
934 * They represent either one or more algorithms, some of which
935 * in any affected category must be supported (set in enabled_mask),
936 * or represent a cipher strength value (will be added in any case because algorithms=0).
937 */
938 for (i = 0; i < num_of_group_aliases; i++) {
939 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey;
940 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth;
941 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc;
942 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac;
943 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl;
944
945 if (algorithm_mkey)
946 if ((algorithm_mkey & mask_mkey) == 0)
947 continue;
948
949 if (algorithm_auth)
950 if ((algorithm_auth & mask_auth) == 0)
951 continue;
952
953 if (algorithm_enc)
954 if ((algorithm_enc & mask_enc) == 0)
955 continue;
956
957 if (algorithm_mac)
958 if ((algorithm_mac & mask_mac) == 0)
959 continue;
960
961 if (algorithm_ssl)
962 if ((algorithm_ssl & mask_ssl) == 0)
963 continue;
964
965 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
966 ca_curr++;
967 }
968
969 *ca_curr = NULL; /* end of list */
970}
971
972static void
973ssl_cipher_apply_rule(unsigned long cipher_id, unsigned long alg_mkey,
974 unsigned long alg_auth, unsigned long alg_enc, unsigned long alg_mac,
975 unsigned long alg_ssl, unsigned long algo_strength,
976 int rule, int strength_bits, CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
977{
978 CIPHER_ORDER *head, *tail, *curr, *next, *last;
979 const SSL_CIPHER *cp;
980 int reverse = 0;
981
982
983 if (rule == CIPHER_DEL)
984 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */
985
986 head = *head_p;
987 tail = *tail_p;
988
989 if (reverse) {
990 next = tail;
991 last = head;
992 } else {
993 next = head;
994 last = tail;
995 }
996
997 curr = NULL;
998 for (;;) {
999 if (curr == last)
1000 break;
1001 curr = next;
1002 next = reverse ? curr->prev : curr->next;
1003
1004 cp = curr->cipher;
1005
1006 /*
1007 * Selection criteria is either the value of strength_bits
1008 * or the algorithms used.
1009 */
1010 if (strength_bits >= 0) {
1011 if (strength_bits != cp->strength_bits)
1012 continue;
1013 } else {
1014
1015 if (alg_mkey && !(alg_mkey & cp->algorithm_mkey))
1016 continue;
1017 if (alg_auth && !(alg_auth & cp->algorithm_auth))
1018 continue;
1019 if (alg_enc && !(alg_enc & cp->algorithm_enc))
1020 continue;
1021 if (alg_mac && !(alg_mac & cp->algorithm_mac))
1022 continue;
1023 if (alg_ssl && !(alg_ssl & cp->algorithm_ssl))
1024 continue;
1025 if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
1026 continue;
1027 }
1028
1029
1030 /* add the cipher if it has not been added yet. */
1031 if (rule == CIPHER_ADD) {
1032 /* reverse == 0 */
1033 if (!curr->active) {
1034 ll_append_tail(&head, curr, &tail);
1035 curr->active = 1;
1036 }
1037 }
1038 /* Move the added cipher to this location */
1039 else if (rule == CIPHER_ORD) {
1040 /* reverse == 0 */
1041 if (curr->active) {
1042 ll_append_tail(&head, curr, &tail);
1043 }
1044 } else if (rule == CIPHER_DEL) {
1045 /* reverse == 1 */
1046 if (curr->active) {
1047 /* most recently deleted ciphersuites get best positions
1048 * for any future CIPHER_ADD (note that the CIPHER_DEL loop
1049 * works in reverse to maintain the order) */
1050 ll_append_head(&head, curr, &tail);
1051 curr->active = 0;
1052 }
1053 } else if (rule == CIPHER_KILL) {
1054 /* reverse == 0 */
1055 if (head == curr)
1056 head = curr->next;
1057 else
1058 curr->prev->next = curr->next;
1059 if (tail == curr)
1060 tail = curr->prev;
1061 curr->active = 0;
1062 if (curr->next != NULL)
1063 curr->next->prev = curr->prev;
1064 if (curr->prev != NULL)
1065 curr->prev->next = curr->next;
1066 curr->next = NULL;
1067 curr->prev = NULL;
1068 }
1069 }
1070
1071 *head_p = head;
1072 *tail_p = tail;
1073}
1074
1075static int
1076ssl_cipher_strength_sort(CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
1077{
1078 int max_strength_bits, i, *number_uses;
1079 CIPHER_ORDER *curr;
1080
1081 /*
1082 * This routine sorts the ciphers with descending strength. The sorting
1083 * must keep the pre-sorted sequence, so we apply the normal sorting
1084 * routine as '+' movement to the end of the list.
1085 */
1086 max_strength_bits = 0;
1087 curr = *head_p;
1088 while (curr != NULL) {
1089 if (curr->active &&
1090 (curr->cipher->strength_bits > max_strength_bits))
1091 max_strength_bits = curr->cipher->strength_bits;
1092 curr = curr->next;
1093 }
1094
1095 number_uses = calloc((max_strength_bits + 1), sizeof(int));
1096 if (!number_uses) {
1097 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT, ERR_R_MALLOC_FAILURE);
1098 return (0);
1099 }
1100
1101 /*
1102 * Now find the strength_bits values actually used
1103 */
1104 curr = *head_p;
1105 while (curr != NULL) {
1106 if (curr->active)
1107 number_uses[curr->cipher->strength_bits]++;
1108 curr = curr->next;
1109 }
1110 /*
1111 * Go through the list of used strength_bits values in descending
1112 * order.
1113 */
1114 for (i = max_strength_bits; i >= 0; i--)
1115 if (number_uses[i] > 0)
1116 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p);
1117
1118 free(number_uses);
1119 return (1);
1120}
1121
1122static int
1123ssl_cipher_process_rulestr(const char *rule_str, CIPHER_ORDER **head_p,
1124 CIPHER_ORDER **tail_p, const SSL_CIPHER **ca_list)
1125{
1126 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl;
1127 unsigned long algo_strength;
1128 int j, multi, found, rule, retval, ok, buflen;
1129 unsigned long cipher_id = 0;
1130 const char *l, *buf;
1131 char ch;
1132
1133 retval = 1;
1134 l = rule_str;
1135 for (;;) {
1136 ch = *l;
1137
1138 if (ch == '\0')
1139 break;
1140
1141 if (ch == '-') {
1142 rule = CIPHER_DEL;
1143 l++;
1144 } else if (ch == '+') {
1145 rule = CIPHER_ORD;
1146 l++;
1147 } else if (ch == '!') {
1148 rule = CIPHER_KILL;
1149 l++;
1150 } else if (ch == '@') {
1151 rule = CIPHER_SPECIAL;
1152 l++;
1153 } else {
1154 rule = CIPHER_ADD;
1155 }
1156
1157 if (ITEM_SEP(ch)) {
1158 l++;
1159 continue;
1160 }
1161
1162 alg_mkey = 0;
1163 alg_auth = 0;
1164 alg_enc = 0;
1165 alg_mac = 0;
1166 alg_ssl = 0;
1167 algo_strength = 0;
1168
1169 for (;;) {
1170 ch = *l;
1171 buf = l;
1172 buflen = 0;
1173 while (((ch >= 'A') && (ch <= 'Z')) ||
1174 ((ch >= '0') && (ch <= '9')) ||
1175 ((ch >= 'a') && (ch <= 'z')) ||
1176 (ch == '-') || (ch == '.')) {
1177 ch = *(++l);
1178 buflen++;
1179 }
1180
1181 if (buflen == 0) {
1182 /*
1183 * We hit something we cannot deal with,
1184 * it is no command or separator nor
1185 * alphanumeric, so we call this an error.
1186 */
1187 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1188 SSL_R_INVALID_COMMAND);
1189 retval = found = 0;
1190 l++;
1191 break;
1192 }
1193
1194 if (rule == CIPHER_SPECIAL) {
1195 /* unused -- avoid compiler warning */
1196 found = 0;
1197 /* special treatment */
1198 break;
1199 }
1200
1201 /* check for multi-part specification */
1202 if (ch == '+') {
1203 multi = 1;
1204 l++;
1205 } else
1206 multi = 0;
1207
1208 /*
1209 * Now search for the cipher alias in the ca_list.
1210 * Be careful with the strncmp, because the "buflen"
1211 * limitation will make the rule "ADH:SOME" and the
1212 * cipher "ADH-MY-CIPHER" look like a match for
1213 * buflen=3. So additionally check whether the cipher
1214 * name found has the correct length. We can save a
1215 * strlen() call: just checking for the '\0' at the
1216 * right place is sufficient, we have to strncmp()
1217 * anyway (we cannot use strcmp(), because buf is not
1218 * '\0' terminated.)
1219 */
1220 j = found = 0;
1221 cipher_id = 0;
1222 while (ca_list[j]) {
1223 if (!strncmp(buf, ca_list[j]->name, buflen) &&
1224 (ca_list[j]->name[buflen] == '\0')) {
1225 found = 1;
1226 break;
1227 } else
1228 j++;
1229 }
1230
1231 if (!found)
1232 break; /* ignore this entry */
1233
1234 if (ca_list[j]->algorithm_mkey) {
1235 if (alg_mkey) {
1236 alg_mkey &= ca_list[j]->algorithm_mkey;
1237 if (!alg_mkey) {
1238 found = 0;
1239 break;
1240 }
1241 } else
1242 alg_mkey = ca_list[j]->algorithm_mkey;
1243 }
1244
1245 if (ca_list[j]->algorithm_auth) {
1246 if (alg_auth) {
1247 alg_auth &= ca_list[j]->algorithm_auth;
1248 if (!alg_auth) {
1249 found = 0;
1250 break;
1251 }
1252 } else
1253 alg_auth = ca_list[j]->algorithm_auth;
1254 }
1255
1256 if (ca_list[j]->algorithm_enc) {
1257 if (alg_enc) {
1258 alg_enc &= ca_list[j]->algorithm_enc;
1259 if (!alg_enc) {
1260 found = 0;
1261 break;
1262 }
1263 } else
1264 alg_enc = ca_list[j]->algorithm_enc;
1265 }
1266
1267 if (ca_list[j]->algorithm_mac) {
1268 if (alg_mac) {
1269 alg_mac &= ca_list[j]->algorithm_mac;
1270 if (!alg_mac) {
1271 found = 0;
1272 break;
1273 }
1274 } else
1275 alg_mac = ca_list[j]->algorithm_mac;
1276 }
1277
1278 if (ca_list[j]->algo_strength & SSL_STRONG_MASK) {
1279 if (algo_strength & SSL_STRONG_MASK) {
1280 algo_strength &=
1281 (ca_list[j]->algo_strength &
1282 SSL_STRONG_MASK) | ~SSL_STRONG_MASK;
1283 if (!(algo_strength &
1284 SSL_STRONG_MASK)) {
1285 found = 0;
1286 break;
1287 }
1288 } else
1289 algo_strength |=
1290 ca_list[j]->algo_strength &
1291 SSL_STRONG_MASK;
1292 }
1293
1294 if (ca_list[j]->valid) {
1295 /*
1296 * explicit ciphersuite found; its protocol
1297 * version does not become part of the search
1298 * pattern!
1299 */
1300 cipher_id = ca_list[j]->id;
1301 } else {
1302 /*
1303 * not an explicit ciphersuite; only in this
1304 * case, the protocol version is considered
1305 * part of the search pattern
1306 */
1307 if (ca_list[j]->algorithm_ssl) {
1308 if (alg_ssl) {
1309 alg_ssl &=
1310 ca_list[j]->algorithm_ssl;
1311 if (!alg_ssl) {
1312 found = 0;
1313 break;
1314 }
1315 } else
1316 alg_ssl =
1317 ca_list[j]->algorithm_ssl;
1318 }
1319 }
1320
1321 if (!multi)
1322 break;
1323 }
1324
1325 /*
1326 * Ok, we have the rule, now apply it
1327 */
1328 if (rule == CIPHER_SPECIAL) {
1329 /* special command */
1330 ok = 0;
1331 if ((buflen == 8) && !strncmp(buf, "STRENGTH", 8))
1332 ok = ssl_cipher_strength_sort(head_p, tail_p);
1333 else
1334 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1335 SSL_R_INVALID_COMMAND);
1336 if (ok == 0)
1337 retval = 0;
1338 /*
1339 * We do not support any "multi" options
1340 * together with "@", so throw away the
1341 * rest of the command, if any left, until
1342 * end or ':' is found.
1343 */
1344 while ((*l != '\0') && !ITEM_SEP(*l))
1345 l++;
1346 } else if (found) {
1347 ssl_cipher_apply_rule(cipher_id, alg_mkey, alg_auth,
1348 alg_enc, alg_mac, alg_ssl, algo_strength, rule,
1349 -1, head_p, tail_p);
1350 } else {
1351 while ((*l != '\0') && !ITEM_SEP(*l))
1352 l++;
1353 }
1354 if (*l == '\0')
1355 break; /* done */
1356 }
1357
1358 return (retval);
1359}
1360
1361STACK_OF(SSL_CIPHER) *
1362ssl_create_cipher_list(const SSL_METHOD *ssl_method,
1363 STACK_OF(SSL_CIPHER) **cipher_list,
1364 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
1365 const char *rule_str)
1366{
1367 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
1368 unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl;
1369 STACK_OF(SSL_CIPHER) *cipherstack, *tmp_cipher_list;
1370 const char *rule_p;
1371 CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
1372 const SSL_CIPHER **ca_list = NULL;
1373
1374 /*
1375 * Return with error if nothing to do.
1376 */
1377 if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == NULL)
1378 return NULL;
1379
1380 /*
1381 * To reduce the work to do we only want to process the compiled
1382 * in algorithms, so we first get the mask of disabled ciphers.
1383 */
1384 ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl);
1385
1386 /*
1387 * Now we have to collect the available ciphers from the compiled
1388 * in ciphers. We cannot get more than the number compiled in, so
1389 * it is used for allocation.
1390 */
1391 num_of_ciphers = ssl_method->num_ciphers();
1392 co_list = reallocarray(NULL, num_of_ciphers, sizeof(CIPHER_ORDER));
1393 if (co_list == NULL) {
1394 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
1395 return(NULL); /* Failure */
1396 }
1397
1398 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers,
1399 disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl,
1400 co_list, &head, &tail);
1401
1402
1403 /* Now arrange all ciphers by preference: */
1404
1405 /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */
1406 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1407 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1408
1409 /*
1410 * CHACHA20 is fast and safe on all hardware and is thus our preferred
1411 * symmetric cipher, with AES second.
1412 */
1413 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1414 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1415
1416 /* Temporarily enable everything else for sorting */
1417 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1418
1419 /* Low priority for MD5 */
1420 ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail);
1421
1422 /* Move anonymous ciphers to the end. Usually, these will remain disabled.
1423 * (For applications that allow them, they aren't too bad, but we prefer
1424 * authenticated ciphers.) */
1425 ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1426
1427 /* Move ciphers without forward secrecy to the end */
1428 ssl_cipher_apply_rule(0, 0, SSL_aECDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1429 ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1430
1431 /* RC4 is sort-of broken -- move the the end */
1432 ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1433
1434 /* Now sort by symmetric encryption strength. The above ordering remains
1435 * in force within each class */
1436 if (!ssl_cipher_strength_sort(&head, &tail)) {
1437 free(co_list);
1438 return NULL;
1439 }
1440
1441 /* Now disable everything (maintaining the ordering!) */
1442 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1443
1444
1445 /*
1446 * We also need cipher aliases for selecting based on the rule_str.
1447 * There might be two types of entries in the rule_str: 1) names
1448 * of ciphers themselves 2) aliases for groups of ciphers.
1449 * For 1) we need the available ciphers and for 2) the cipher
1450 * groups of cipher_aliases added together in one list (otherwise
1451 * we would be happy with just the cipher_aliases table).
1452 */
1453 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
1454 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
1455 ca_list = reallocarray(NULL, num_of_alias_max, sizeof(SSL_CIPHER *));
1456 if (ca_list == NULL) {
1457 free(co_list);
1458 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
1459 return(NULL); /* Failure */
1460 }
1461 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases,
1462 disabled_mkey, disabled_auth, disabled_enc,
1463 disabled_mac, disabled_ssl, head);
1464
1465 /*
1466 * If the rule_string begins with DEFAULT, apply the default rule
1467 * before using the (possibly available) additional rules.
1468 */
1469 ok = 1;
1470 rule_p = rule_str;
1471 if (strncmp(rule_str, "DEFAULT", 7) == 0) {
1472 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
1473 &head, &tail, ca_list);
1474 rule_p += 7;
1475 if (*rule_p == ':')
1476 rule_p++;
1477 }
1478
1479 if (ok && (strlen(rule_p) > 0))
1480 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list);
1481
1482 free((void *)ca_list); /* Not needed anymore */
1483
1484 if (!ok) {
1485 /* Rule processing failure */
1486 free(co_list);
1487 return (NULL);
1488 }
1489
1490 /*
1491 * Allocate new "cipherstack" for the result, return with error
1492 * if we cannot get one.
1493 */
1494 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) {
1495 free(co_list);
1496 return (NULL);
1497 }
1498
1499 /*
1500 * The cipher selection for the list is done. The ciphers are added
1501 * to the resulting precedence to the STACK_OF(SSL_CIPHER).
1502 */
1503 for (curr = head; curr != NULL; curr = curr->next) {
1504 if (curr->active) {
1505 sk_SSL_CIPHER_push(cipherstack, curr->cipher);
1506 }
1507 }
1508 free(co_list); /* Not needed any longer */
1509
1510 tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack);
1511 if (tmp_cipher_list == NULL) {
1512 sk_SSL_CIPHER_free(cipherstack);
1513 return NULL;
1514 }
1515 if (*cipher_list != NULL)
1516 sk_SSL_CIPHER_free(*cipher_list);
1517 *cipher_list = cipherstack;
1518 if (*cipher_list_by_id != NULL)
1519 sk_SSL_CIPHER_free(*cipher_list_by_id);
1520 *cipher_list_by_id = tmp_cipher_list;
1521 (void)sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,
1522 ssl_cipher_ptr_id_cmp);
1523
1524 sk_SSL_CIPHER_sort(*cipher_list_by_id);
1525 return (cipherstack);
1526}
1527
1528const SSL_CIPHER *
1529SSL_CIPHER_get_by_id(unsigned int id)
1530{
1531 return ssl3_get_cipher_by_id(id);
1532}
1533
1534const SSL_CIPHER *
1535SSL_CIPHER_get_by_value(uint16_t value)
1536{
1537 return ssl3_get_cipher_by_value(value);
1538}
1539
1540char *
1541SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len)
1542{
1543 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, alg2;
1544 const char *ver, *kx, *au, *enc, *mac;
1545 char *ret;
1546 int l;
1547
1548 alg_mkey = cipher->algorithm_mkey;
1549 alg_auth = cipher->algorithm_auth;
1550 alg_enc = cipher->algorithm_enc;
1551 alg_mac = cipher->algorithm_mac;
1552 alg_ssl = cipher->algorithm_ssl;
1553
1554 alg2 = cipher->algorithm2;
1555
1556 if (alg_ssl & SSL_SSLV3)
1557 ver = "SSLv3";
1558 else if (alg_ssl & SSL_TLSV1_2)
1559 ver = "TLSv1.2";
1560 else
1561 ver = "unknown";
1562
1563 switch (alg_mkey) {
1564 case SSL_kRSA:
1565 kx = "RSA";
1566 break;
1567 case SSL_kDHE:
1568 kx = "DH";
1569 break;
1570 case SSL_kECDHr:
1571 kx = "ECDH/RSA";
1572 break;
1573 case SSL_kECDHe:
1574 kx = "ECDH/ECDSA";
1575 break;
1576 case SSL_kECDHE:
1577 kx = "ECDH";
1578 break;
1579 case SSL_kGOST:
1580 kx = "GOST";
1581 break;
1582 default:
1583 kx = "unknown";
1584 }
1585
1586 switch (alg_auth) {
1587 case SSL_aRSA:
1588 au = "RSA";
1589 break;
1590 case SSL_aDSS:
1591 au = "DSS";
1592 break;
1593 case SSL_aECDH:
1594 au = "ECDH";
1595 break;
1596 case SSL_aNULL:
1597 au = "None";
1598 break;
1599 case SSL_aECDSA:
1600 au = "ECDSA";
1601 break;
1602 case SSL_aGOST01:
1603 au = "GOST01";
1604 break;
1605 default:
1606 au = "unknown";
1607 break;
1608 }
1609
1610 switch (alg_enc) {
1611 case SSL_DES:
1612 enc = "DES(56)";
1613 break;
1614 case SSL_3DES:
1615 enc = "3DES(168)";
1616 break;
1617 case SSL_RC4:
1618 enc = alg2 & SSL2_CF_8_BYTE_ENC ? "RC4(64)" : "RC4(128)";
1619 break;
1620 case SSL_IDEA:
1621 enc = "IDEA(128)";
1622 break;
1623 case SSL_eNULL:
1624 enc = "None";
1625 break;
1626 case SSL_AES128:
1627 enc = "AES(128)";
1628 break;
1629 case SSL_AES256:
1630 enc = "AES(256)";
1631 break;
1632 case SSL_AES128GCM:
1633 enc = "AESGCM(128)";
1634 break;
1635 case SSL_AES256GCM:
1636 enc = "AESGCM(256)";
1637 break;
1638 case SSL_CAMELLIA128:
1639 enc = "Camellia(128)";
1640 break;
1641 case SSL_CAMELLIA256:
1642 enc = "Camellia(256)";
1643 break;
1644 case SSL_CHACHA20POLY1305:
1645 enc = "ChaCha20-Poly1305";
1646 break;
1647 case SSL_eGOST2814789CNT:
1648 enc = "GOST-28178-89-CNT";
1649 break;
1650 default:
1651 enc = "unknown";
1652 break;
1653 }
1654
1655 switch (alg_mac) {
1656 case SSL_MD5:
1657 mac = "MD5";
1658 break;
1659 case SSL_SHA1:
1660 mac = "SHA1";
1661 break;
1662 case SSL_SHA256:
1663 mac = "SHA256";
1664 break;
1665 case SSL_SHA384:
1666 mac = "SHA384";
1667 break;
1668 case SSL_AEAD:
1669 mac = "AEAD";
1670 break;
1671 case SSL_GOST94:
1672 mac = "GOST94";
1673 break;
1674 case SSL_GOST89MAC:
1675 mac = "GOST89IMIT";
1676 break;
1677 case SSL_STREEBOG256:
1678 mac = "STREEBOG256";
1679 break;
1680 case SSL_STREEBOG512:
1681 mac = "STREEBOG512";
1682 break;
1683 default:
1684 mac = "unknown";
1685 break;
1686 }
1687
1688 if (asprintf(&ret, "%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s\n",
1689 cipher->name, ver, kx, au, enc, mac) == -1)
1690 return "OPENSSL_malloc Error";
1691
1692 if (buf != NULL) {
1693 l = strlcpy(buf, ret, len);
1694 free(ret);
1695 ret = buf;
1696 if (l >= len)
1697 ret = "Buffer too small";
1698 }
1699
1700 return (ret);
1701}
1702
1703char *
1704SSL_CIPHER_get_version(const SSL_CIPHER *c)
1705{
1706 if (c == NULL)
1707 return("(NONE)");
1708 if ((c->id >> 24) == 3)
1709 return("TLSv1/SSLv3");
1710 else
1711 return("unknown");
1712}
1713
1714/* return the actual cipher being used */
1715const char *
1716SSL_CIPHER_get_name(const SSL_CIPHER *c)
1717{
1718 if (c != NULL)
1719 return (c->name);
1720 return("(NONE)");
1721}
1722
1723/* number of bits for symmetric cipher */
1724int
1725SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
1726{
1727 int ret = 0;
1728
1729 if (c != NULL) {
1730 if (alg_bits != NULL)
1731 *alg_bits = c->alg_bits;
1732 ret = c->strength_bits;
1733 }
1734 return (ret);
1735}
1736
1737unsigned long
1738SSL_CIPHER_get_id(const SSL_CIPHER *c)
1739{
1740 return c->id;
1741}
1742
1743uint16_t
1744SSL_CIPHER_get_value(const SSL_CIPHER *c)
1745{
1746 return ssl3_cipher_get_value(c);
1747}
1748
1749void *
1750SSL_COMP_get_compression_methods(void)
1751{
1752 return NULL;
1753}
1754
1755int
1756SSL_COMP_add_compression_method(int id, void *cm)
1757{
1758 return 1;
1759}
1760
1761const char *
1762SSL_COMP_get_name(const void *comp)
1763{
1764 return NULL;
1765}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-11-23 08:09:49 +0000