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1/* $OpenBSD: ssl_ciph.c,v 1.135 2022/11/26 16:08:55 tb 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#include <openssl/opensslconf.h>
147
148#ifndef OPENSSL_NO_ENGINE
149#include <openssl/engine.h>
150#endif
151
152#include "ssl_local.h"
153
154#define CIPHER_ADD 1
155#define CIPHER_KILL 2
156#define CIPHER_DEL 3
157#define CIPHER_ORD 4
158#define CIPHER_SPECIAL 5
159
160typedef struct cipher_order_st {
161 const SSL_CIPHER *cipher;
162 int active;
163 int dead;
164 struct cipher_order_st *next, *prev;
165} CIPHER_ORDER;
166
167static const SSL_CIPHER cipher_aliases[] = {
168
169 /* "ALL" doesn't include eNULL (must be specifically enabled) */
170 {
171 .name = SSL_TXT_ALL,
172 .algorithm_enc = ~SSL_eNULL,
173 },
174
175 /* "COMPLEMENTOFALL" */
176 {
177 .name = SSL_TXT_CMPALL,
178 .algorithm_enc = SSL_eNULL,
179 },
180
181 /*
182 * "COMPLEMENTOFDEFAULT"
183 * (does *not* include ciphersuites not found in ALL!)
184 */
185 {
186 .name = SSL_TXT_CMPDEF,
187 .algorithm_mkey = SSL_kDHE|SSL_kECDHE,
188 .algorithm_auth = SSL_aNULL,
189 .algorithm_enc = ~SSL_eNULL,
190 },
191
192 /*
193 * key exchange aliases
194 * (some of those using only a single bit here combine multiple key
195 * exchange algs according to the RFCs, e.g. kEDH combines DHE_DSS
196 * and DHE_RSA)
197 */
198 {
199 .name = SSL_TXT_kRSA,
200 .algorithm_mkey = SSL_kRSA,
201 },
202 {
203 .name = SSL_TXT_kEDH,
204 .algorithm_mkey = SSL_kDHE,
205 },
206 {
207 .name = SSL_TXT_DH,
208 .algorithm_mkey = SSL_kDHE,
209 },
210 {
211 .name = SSL_TXT_kEECDH,
212 .algorithm_mkey = SSL_kECDHE,
213 },
214 {
215 .name = SSL_TXT_ECDH,
216 .algorithm_mkey = SSL_kECDHE,
217 },
218 {
219 .name = SSL_TXT_kGOST,
220 .algorithm_mkey = SSL_kGOST,
221 },
222
223 /* server authentication aliases */
224 {
225 .name = SSL_TXT_aRSA,
226 .algorithm_auth = SSL_aRSA,
227 },
228 {
229 .name = SSL_TXT_aDSS,
230 .algorithm_auth = SSL_aDSS,
231 },
232 {
233 .name = SSL_TXT_DSS,
234 .algorithm_auth = SSL_aDSS,
235 },
236 {
237 .name = SSL_TXT_aNULL,
238 .algorithm_auth = SSL_aNULL,
239 },
240 {
241 .name = SSL_TXT_aECDSA,
242 .algorithm_auth = SSL_aECDSA,
243 },
244 {
245 .name = SSL_TXT_ECDSA,
246 .algorithm_auth = SSL_aECDSA,
247 },
248 {
249 .name = SSL_TXT_aGOST01,
250 .algorithm_auth = SSL_aGOST01,
251 },
252 {
253 .name = SSL_TXT_aGOST,
254 .algorithm_auth = SSL_aGOST01,
255 },
256
257 /* aliases combining key exchange and server authentication */
258 {
259 .name = SSL_TXT_DHE,
260 .algorithm_mkey = SSL_kDHE,
261 .algorithm_auth = ~SSL_aNULL,
262 },
263 {
264 .name = SSL_TXT_EDH,
265 .algorithm_mkey = SSL_kDHE,
266 .algorithm_auth = ~SSL_aNULL,
267 },
268 {
269 .name = SSL_TXT_ECDHE,
270 .algorithm_mkey = SSL_kECDHE,
271 .algorithm_auth = ~SSL_aNULL,
272 },
273 {
274 .name = SSL_TXT_EECDH,
275 .algorithm_mkey = SSL_kECDHE,
276 .algorithm_auth = ~SSL_aNULL,
277 },
278 {
279 .name = SSL_TXT_NULL,
280 .algorithm_enc = SSL_eNULL,
281 },
282 {
283 .name = SSL_TXT_RSA,
284 .algorithm_mkey = SSL_kRSA,
285 .algorithm_auth = SSL_aRSA,
286 },
287 {
288 .name = SSL_TXT_ADH,
289 .algorithm_mkey = SSL_kDHE,
290 .algorithm_auth = SSL_aNULL,
291 },
292 {
293 .name = SSL_TXT_AECDH,
294 .algorithm_mkey = SSL_kECDHE,
295 .algorithm_auth = SSL_aNULL,
296 },
297
298 /* symmetric encryption aliases */
299 {
300 .name = SSL_TXT_3DES,
301 .algorithm_enc = SSL_3DES,
302 },
303 {
304 .name = SSL_TXT_RC4,
305 .algorithm_enc = SSL_RC4,
306 },
307 {
308 .name = SSL_TXT_eNULL,
309 .algorithm_enc = SSL_eNULL,
310 },
311 {
312 .name = SSL_TXT_AES128,
313 .algorithm_enc = SSL_AES128|SSL_AES128GCM,
314 },
315 {
316 .name = SSL_TXT_AES256,
317 .algorithm_enc = SSL_AES256|SSL_AES256GCM,
318 },
319 {
320 .name = SSL_TXT_AES,
321 .algorithm_enc = SSL_AES,
322 },
323 {
324 .name = SSL_TXT_AES_GCM,
325 .algorithm_enc = SSL_AES128GCM|SSL_AES256GCM,
326 },
327 {
328 .name = SSL_TXT_CAMELLIA128,
329 .algorithm_enc = SSL_CAMELLIA128,
330 },
331 {
332 .name = SSL_TXT_CAMELLIA256,
333 .algorithm_enc = SSL_CAMELLIA256,
334 },
335 {
336 .name = SSL_TXT_CAMELLIA,
337 .algorithm_enc = SSL_CAMELLIA128|SSL_CAMELLIA256,
338 },
339 {
340 .name = SSL_TXT_CHACHA20,
341 .algorithm_enc = SSL_CHACHA20POLY1305,
342 },
343
344 /* MAC aliases */
345 {
346 .name = SSL_TXT_AEAD,
347 .algorithm_mac = SSL_AEAD,
348 },
349 {
350 .name = SSL_TXT_MD5,
351 .algorithm_mac = SSL_MD5,
352 },
353 {
354 .name = SSL_TXT_SHA1,
355 .algorithm_mac = SSL_SHA1,
356 },
357 {
358 .name = SSL_TXT_SHA,
359 .algorithm_mac = SSL_SHA1,
360 },
361 {
362 .name = SSL_TXT_GOST94,
363 .algorithm_mac = SSL_GOST94,
364 },
365 {
366 .name = SSL_TXT_GOST89MAC,
367 .algorithm_mac = SSL_GOST89MAC,
368 },
369 {
370 .name = SSL_TXT_SHA256,
371 .algorithm_mac = SSL_SHA256,
372 },
373 {
374 .name = SSL_TXT_SHA384,
375 .algorithm_mac = SSL_SHA384,
376 },
377 {
378 .name = SSL_TXT_STREEBOG256,
379 .algorithm_mac = SSL_STREEBOG256,
380 },
381
382 /* protocol version aliases */
383 {
384 .name = SSL_TXT_SSLV3,
385 .algorithm_ssl = SSL_SSLV3,
386 },
387 {
388 .name = SSL_TXT_TLSV1,
389 .algorithm_ssl = SSL_TLSV1,
390 },
391 {
392 .name = SSL_TXT_TLSV1_2,
393 .algorithm_ssl = SSL_TLSV1_2,
394 },
395 {
396 .name = SSL_TXT_TLSV1_3,
397 .algorithm_ssl = SSL_TLSV1_3,
398 },
399
400 /* cipher suite aliases */
401#ifdef LIBRESSL_HAS_TLS1_3
402 {
403 .valid = 1,
404 .name = "TLS_AES_128_GCM_SHA256",
405 .id = TLS1_3_CK_AES_128_GCM_SHA256,
406 .algorithm_ssl = SSL_TLSV1_3,
407 },
408 {
409 .valid = 1,
410 .name = "TLS_AES_256_GCM_SHA384",
411 .id = TLS1_3_CK_AES_256_GCM_SHA384,
412 .algorithm_ssl = SSL_TLSV1_3,
413 },
414 {
415 .valid = 1,
416 .name = "TLS_CHACHA20_POLY1305_SHA256",
417 .id = TLS1_3_CK_CHACHA20_POLY1305_SHA256,
418 .algorithm_ssl = SSL_TLSV1_3,
419 },
420#endif
421
422 /* strength classes */
423 {
424 .name = SSL_TXT_LOW,
425 .algo_strength = SSL_LOW,
426 },
427 {
428 .name = SSL_TXT_MEDIUM,
429 .algo_strength = SSL_MEDIUM,
430 },
431 {
432 .name = SSL_TXT_HIGH,
433 .algo_strength = SSL_HIGH,
434 },
435};
436
437int
438ssl_cipher_get_evp(const SSL_SESSION *ss, const EVP_CIPHER **enc,
439 const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size)
440{
441 *enc = NULL;
442 *md = NULL;
443 *mac_pkey_type = NID_undef;
444 *mac_secret_size = 0;
445
446 if (ss->cipher == NULL)
447 return 0;
448
449 /*
450 * This function does not handle EVP_AEAD.
451 * See ssl_cipher_get_evp_aead instead.
452 */
453 if (ss->cipher->algorithm_mac & SSL_AEAD)
454 return 0;
455
456 switch (ss->cipher->algorithm_enc) {
457 case SSL_3DES:
458 *enc = EVP_des_ede3_cbc();
459 break;
460 case SSL_RC4:
461 *enc = EVP_rc4();
462 break;
463 case SSL_eNULL:
464 *enc = EVP_enc_null();
465 break;
466 case SSL_AES128:
467 *enc = EVP_aes_128_cbc();
468 break;
469 case SSL_AES256:
470 *enc = EVP_aes_256_cbc();
471 break;
472 case SSL_CAMELLIA128:
473 *enc = EVP_camellia_128_cbc();
474 break;
475 case SSL_CAMELLIA256:
476 *enc = EVP_camellia_256_cbc();
477 break;
478 case SSL_eGOST2814789CNT:
479 *enc = EVP_gost2814789_cnt();
480 break;
481 }
482
483 switch (ss->cipher->algorithm_mac) {
484 case SSL_MD5:
485 *md = EVP_md5();
486 break;
487 case SSL_SHA1:
488 *md = EVP_sha1();
489 break;
490 case SSL_SHA256:
491 *md = EVP_sha256();
492 break;
493 case SSL_SHA384:
494 *md = EVP_sha384();
495 break;
496 case SSL_GOST89MAC:
497 *md = EVP_gost2814789imit();
498 break;
499 case SSL_GOST94:
500 *md = EVP_gostr341194();
501 break;
502 case SSL_STREEBOG256:
503 *md = EVP_streebog256();
504 break;
505 }
506
507 if (*enc == NULL || *md == NULL)
508 return 0;
509
510 /*
511 * EVP_CIPH_FLAG_AEAD_CIPHER and EVP_CIPH_GCM_MODE ciphers are not
512 * supported via EVP_CIPHER (they should be using EVP_AEAD instead).
513 */
514 if (EVP_CIPHER_flags(*enc) & EVP_CIPH_FLAG_AEAD_CIPHER)
515 return 0;
516 if (EVP_CIPHER_mode(*enc) == EVP_CIPH_GCM_MODE)
517 return 0;
518
519 if (ss->cipher->algorithm_mac == SSL_GOST89MAC) {
520 *mac_pkey_type = EVP_PKEY_GOSTIMIT;
521 *mac_secret_size = 32; /* XXX */
522 } else {
523 *mac_pkey_type = EVP_PKEY_HMAC;
524 *mac_secret_size = EVP_MD_size(*md);
525 }
526
527 return 1;
528}
529
530/*
531 * ssl_cipher_get_evp_aead sets aead to point to the correct EVP_AEAD object
532 * for s->cipher. It returns 1 on success and 0 on error.
533 */
534int
535ssl_cipher_get_evp_aead(const SSL_SESSION *ss, const EVP_AEAD **aead)
536{
537 *aead = NULL;
538
539 if (ss->cipher == NULL)
540 return 0;
541 if ((ss->cipher->algorithm_mac & SSL_AEAD) == 0)
542 return 0;
543
544 switch (ss->cipher->algorithm_enc) {
545 case SSL_AES128GCM:
546 *aead = EVP_aead_aes_128_gcm();
547 return 1;
548 case SSL_AES256GCM:
549 *aead = EVP_aead_aes_256_gcm();
550 return 1;
551 case SSL_CHACHA20POLY1305:
552 *aead = EVP_aead_chacha20_poly1305();
553 return 1;
554 default:
555 break;
556 }
557 return 0;
558}
559
560int
561ssl_get_handshake_evp_md(SSL *s, const EVP_MD **md)
562{
563 unsigned long handshake_mac;
564
565 *md = NULL;
566
567 if (s->s3->hs.cipher == NULL)
568 return 0;
569
570 handshake_mac = s->s3->hs.cipher->algorithm2 &
571 SSL_HANDSHAKE_MAC_MASK;
572
573 /* For TLSv1.2 we upgrade the default MD5+SHA1 MAC to SHA256. */
574 if (SSL_USE_SHA256_PRF(s) && handshake_mac == SSL_HANDSHAKE_MAC_DEFAULT)
575 handshake_mac = SSL_HANDSHAKE_MAC_SHA256;
576
577 switch (handshake_mac) {
578 case SSL_HANDSHAKE_MAC_DEFAULT:
579 *md = EVP_md5_sha1();
580 return 1;
581 case SSL_HANDSHAKE_MAC_GOST94:
582 *md = EVP_gostr341194();
583 return 1;
584 case SSL_HANDSHAKE_MAC_SHA256:
585 *md = EVP_sha256();
586 return 1;
587 case SSL_HANDSHAKE_MAC_SHA384:
588 *md = EVP_sha384();
589 return 1;
590 case SSL_HANDSHAKE_MAC_STREEBOG256:
591 *md = EVP_streebog256();
592 return 1;
593 default:
594 break;
595 }
596
597 return 0;
598}
599
600#define ITEM_SEP(a) \
601 (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
602
603static void
604ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
605 CIPHER_ORDER **tail)
606{
607 if (curr == *tail)
608 return;
609 if (curr == *head)
610 *head = curr->next;
611 if (curr->prev != NULL)
612 curr->prev->next = curr->next;
613 if (curr->next != NULL)
614 curr->next->prev = curr->prev;
615 (*tail)->next = curr;
616 curr->prev= *tail;
617 curr->next = NULL;
618 *tail = curr;
619}
620
621static void
622ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr,
623 CIPHER_ORDER **tail)
624{
625 if (curr == *head)
626 return;
627 if (curr == *tail)
628 *tail = curr->prev;
629 if (curr->next != NULL)
630 curr->next->prev = curr->prev;
631 if (curr->prev != NULL)
632 curr->prev->next = curr->next;
633 (*head)->prev = curr;
634 curr->next= *head;
635 curr->prev = NULL;
636 *head = curr;
637}
638
639static void
640ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth,
641 unsigned long *enc, unsigned long *mac, unsigned long *ssl)
642{
643 *mkey = 0;
644 *auth = 0;
645 *enc = 0;
646 *mac = 0;
647 *ssl = 0;
648
649 /*
650 * Check for the availability of GOST 34.10 public/private key
651 * algorithms. If they are not available disable the associated
652 * authentication and key exchange algorithms.
653 */
654 if (EVP_PKEY_meth_find(NID_id_GostR3410_2001) == NULL) {
655 *auth |= SSL_aGOST01;
656 *mkey |= SSL_kGOST;
657 }
658
659#ifdef SSL_FORBID_ENULL
660 *enc |= SSL_eNULL;
661#endif
662}
663
664static void
665ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method, int num_of_ciphers,
666 unsigned long disabled_mkey, unsigned long disabled_auth,
667 unsigned long disabled_enc, unsigned long disabled_mac,
668 unsigned long disabled_ssl, CIPHER_ORDER *co_list,
669 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
670{
671 int i, co_list_num;
672 const SSL_CIPHER *c;
673
674 /*
675 * We have num_of_ciphers descriptions compiled in, depending on the
676 * method selected (SSLv3, TLSv1, etc). These will later be sorted in
677 * a linked list with at most num entries.
678 */
679
680 /* Get the initial list of ciphers */
681 co_list_num = 0; /* actual count of ciphers */
682 for (i = 0; i < num_of_ciphers; i++) {
683 c = ssl_method->get_cipher(i);
684 /*
685 * Drop any invalid ciphers and any which use unavailable
686 * algorithms.
687 */
688 if ((c != NULL) && c->valid &&
689 !(c->algorithm_mkey & disabled_mkey) &&
690 !(c->algorithm_auth & disabled_auth) &&
691 !(c->algorithm_enc & disabled_enc) &&
692 !(c->algorithm_mac & disabled_mac) &&
693 !(c->algorithm_ssl & disabled_ssl)) {
694 co_list[co_list_num].cipher = c;
695 co_list[co_list_num].next = NULL;
696 co_list[co_list_num].prev = NULL;
697 co_list[co_list_num].active = 0;
698 co_list_num++;
699 }
700 }
701
702 /*
703 * Prepare linked list from list entries
704 */
705 if (co_list_num > 0) {
706 co_list[0].prev = NULL;
707
708 if (co_list_num > 1) {
709 co_list[0].next = &co_list[1];
710
711 for (i = 1; i < co_list_num - 1; i++) {
712 co_list[i].prev = &co_list[i - 1];
713 co_list[i].next = &co_list[i + 1];
714 }
715
716 co_list[co_list_num - 1].prev =
717 &co_list[co_list_num - 2];
718 }
719
720 co_list[co_list_num - 1].next = NULL;
721
722 *head_p = &co_list[0];
723 *tail_p = &co_list[co_list_num - 1];
724 }
725}
726
727static void
728ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list, int num_of_group_aliases,
729 unsigned long disabled_mkey, unsigned long disabled_auth,
730 unsigned long disabled_enc, unsigned long disabled_mac,
731 unsigned long disabled_ssl, CIPHER_ORDER *head)
732{
733 CIPHER_ORDER *ciph_curr;
734 const SSL_CIPHER **ca_curr;
735 int i;
736 unsigned long mask_mkey = ~disabled_mkey;
737 unsigned long mask_auth = ~disabled_auth;
738 unsigned long mask_enc = ~disabled_enc;
739 unsigned long mask_mac = ~disabled_mac;
740 unsigned long mask_ssl = ~disabled_ssl;
741
742 /*
743 * First, add the real ciphers as already collected
744 */
745 ciph_curr = head;
746 ca_curr = ca_list;
747 while (ciph_curr != NULL) {
748 *ca_curr = ciph_curr->cipher;
749 ca_curr++;
750 ciph_curr = ciph_curr->next;
751 }
752
753 /*
754 * Now we add the available ones from the cipher_aliases[] table.
755 * They represent either one or more algorithms, some of which
756 * in any affected category must be supported (set in enabled_mask),
757 * or represent a cipher strength value (will be added in any case because algorithms=0).
758 */
759 for (i = 0; i < num_of_group_aliases; i++) {
760 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey;
761 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth;
762 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc;
763 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac;
764 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl;
765
766 if (algorithm_mkey)
767 if ((algorithm_mkey & mask_mkey) == 0)
768 continue;
769
770 if (algorithm_auth)
771 if ((algorithm_auth & mask_auth) == 0)
772 continue;
773
774 if (algorithm_enc)
775 if ((algorithm_enc & mask_enc) == 0)
776 continue;
777
778 if (algorithm_mac)
779 if ((algorithm_mac & mask_mac) == 0)
780 continue;
781
782 if (algorithm_ssl)
783 if ((algorithm_ssl & mask_ssl) == 0)
784 continue;
785
786 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
787 ca_curr++;
788 }
789
790 *ca_curr = NULL; /* end of list */
791}
792
793static void
794ssl_cipher_apply_rule(unsigned long cipher_id, unsigned long alg_mkey,
795 unsigned long alg_auth, unsigned long alg_enc, unsigned long alg_mac,
796 unsigned long alg_ssl, unsigned long algo_strength, int rule,
797 int strength_bits, CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
798{
799 CIPHER_ORDER *head, *tail, *curr, *next, *last;
800 const SSL_CIPHER *cp;
801 int reverse = 0;
802
803 if (rule == CIPHER_DEL)
804 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */
805
806 head = *head_p;
807 tail = *tail_p;
808
809 if (reverse) {
810 next = tail;
811 last = head;
812 } else {
813 next = head;
814 last = tail;
815 }
816
817 curr = NULL;
818 for (;;) {
819 if (curr == last)
820 break;
821 curr = next;
822 next = reverse ? curr->prev : curr->next;
823
824 cp = curr->cipher;
825
826 if (cipher_id && cp->id != cipher_id)
827 continue;
828
829 /*
830 * Selection criteria is either the value of strength_bits
831 * or the algorithms used.
832 */
833 if (strength_bits >= 0) {
834 if (strength_bits != cp->strength_bits)
835 continue;
836 } else {
837 if (alg_mkey && !(alg_mkey & cp->algorithm_mkey))
838 continue;
839 if (alg_auth && !(alg_auth & cp->algorithm_auth))
840 continue;
841 if (alg_enc && !(alg_enc & cp->algorithm_enc))
842 continue;
843 if (alg_mac && !(alg_mac & cp->algorithm_mac))
844 continue;
845 if (alg_ssl && !(alg_ssl & cp->algorithm_ssl))
846 continue;
847 if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
848 continue;
849 }
850
851 /* add the cipher if it has not been added yet. */
852 if (rule == CIPHER_ADD) {
853 /* reverse == 0 */
854 if (!curr->active) {
855 ll_append_tail(&head, curr, &tail);
856 curr->active = 1;
857 }
858 }
859 /* Move the added cipher to this location */
860 else if (rule == CIPHER_ORD) {
861 /* reverse == 0 */
862 if (curr->active) {
863 ll_append_tail(&head, curr, &tail);
864 }
865 } else if (rule == CIPHER_DEL) {
866 /* reverse == 1 */
867 if (curr->active) {
868 /* most recently deleted ciphersuites get best positions
869 * for any future CIPHER_ADD (note that the CIPHER_DEL loop
870 * works in reverse to maintain the order) */
871 ll_append_head(&head, curr, &tail);
872 curr->active = 0;
873 }
874 } else if (rule == CIPHER_KILL) {
875 /* reverse == 0 */
876 if (head == curr)
877 head = curr->next;
878 else
879 curr->prev->next = curr->next;
880 if (tail == curr)
881 tail = curr->prev;
882 curr->active = 0;
883 if (curr->next != NULL)
884 curr->next->prev = curr->prev;
885 if (curr->prev != NULL)
886 curr->prev->next = curr->next;
887 curr->next = NULL;
888 curr->prev = NULL;
889 }
890 }
891
892 *head_p = head;
893 *tail_p = tail;
894}
895
896static int
897ssl_cipher_strength_sort(CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
898{
899 int max_strength_bits, i, *number_uses;
900 CIPHER_ORDER *curr;
901
902 /*
903 * This routine sorts the ciphers with descending strength. The sorting
904 * must keep the pre-sorted sequence, so we apply the normal sorting
905 * routine as '+' movement to the end of the list.
906 */
907 max_strength_bits = 0;
908 curr = *head_p;
909 while (curr != NULL) {
910 if (curr->active &&
911 (curr->cipher->strength_bits > max_strength_bits))
912 max_strength_bits = curr->cipher->strength_bits;
913 curr = curr->next;
914 }
915
916 number_uses = calloc((max_strength_bits + 1), sizeof(int));
917 if (!number_uses) {
918 SSLerrorx(ERR_R_MALLOC_FAILURE);
919 return (0);
920 }
921
922 /*
923 * Now find the strength_bits values actually used
924 */
925 curr = *head_p;
926 while (curr != NULL) {
927 if (curr->active)
928 number_uses[curr->cipher->strength_bits]++;
929 curr = curr->next;
930 }
931 /*
932 * Go through the list of used strength_bits values in descending
933 * order.
934 */
935 for (i = max_strength_bits; i >= 0; i--)
936 if (number_uses[i] > 0)
937 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p);
938
939 free(number_uses);
940 return (1);
941}
942
943static int
944ssl_cipher_process_rulestr(const char *rule_str, CIPHER_ORDER **head_p,
945 CIPHER_ORDER **tail_p, const SSL_CIPHER **ca_list, SSL_CERT *cert,
946 int *tls13_seen)
947{
948 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl;
949 unsigned long algo_strength;
950 int j, multi, found, rule, retval, ok, buflen;
951 unsigned long cipher_id = 0;
952 const char *l, *buf;
953 char ch;
954
955 *tls13_seen = 0;
956
957 retval = 1;
958 l = rule_str;
959 for (;;) {
960 ch = *l;
961
962 if (ch == '\0')
963 break;
964
965 if (ch == '-') {
966 rule = CIPHER_DEL;
967 l++;
968 } else if (ch == '+') {
969 rule = CIPHER_ORD;
970 l++;
971 } else if (ch == '!') {
972 rule = CIPHER_KILL;
973 l++;
974 } else if (ch == '@') {
975 rule = CIPHER_SPECIAL;
976 l++;
977 } else {
978 rule = CIPHER_ADD;
979 }
980
981 if (ITEM_SEP(ch)) {
982 l++;
983 continue;
984 }
985
986 alg_mkey = 0;
987 alg_auth = 0;
988 alg_enc = 0;
989 alg_mac = 0;
990 alg_ssl = 0;
991 algo_strength = 0;
992
993 for (;;) {
994 ch = *l;
995 buf = l;
996 buflen = 0;
997 while (((ch >= 'A') && (ch <= 'Z')) ||
998 ((ch >= '0') && (ch <= '9')) ||
999 ((ch >= 'a') && (ch <= 'z')) ||
1000 (ch == '-') || (ch == '.') ||
1001 (ch == '_') || (ch == '=')) {
1002 ch = *(++l);
1003 buflen++;
1004 }
1005
1006 if (buflen == 0) {
1007 /*
1008 * We hit something we cannot deal with,
1009 * it is no command or separator nor
1010 * alphanumeric, so we call this an error.
1011 */
1012 SSLerrorx(SSL_R_INVALID_COMMAND);
1013 return 0;
1014 }
1015
1016 if (rule == CIPHER_SPECIAL) {
1017 /* unused -- avoid compiler warning */
1018 found = 0;
1019 /* special treatment */
1020 break;
1021 }
1022
1023 /* check for multi-part specification */
1024 if (ch == '+') {
1025 multi = 1;
1026 l++;
1027 } else
1028 multi = 0;
1029
1030 /*
1031 * Now search for the cipher alias in the ca_list.
1032 * Be careful with the strncmp, because the "buflen"
1033 * limitation will make the rule "ADH:SOME" and the
1034 * cipher "ADH-MY-CIPHER" look like a match for
1035 * buflen=3. So additionally check whether the cipher
1036 * name found has the correct length. We can save a
1037 * strlen() call: just checking for the '\0' at the
1038 * right place is sufficient, we have to strncmp()
1039 * anyway (we cannot use strcmp(), because buf is not
1040 * '\0' terminated.)
1041 */
1042 j = found = 0;
1043 cipher_id = 0;
1044 while (ca_list[j]) {
1045 if (!strncmp(buf, ca_list[j]->name, buflen) &&
1046 (ca_list[j]->name[buflen] == '\0')) {
1047 found = 1;
1048 break;
1049 } else
1050 j++;
1051 }
1052
1053 if (!found)
1054 break; /* ignore this entry */
1055
1056 if (ca_list[j]->algorithm_mkey) {
1057 if (alg_mkey) {
1058 alg_mkey &= ca_list[j]->algorithm_mkey;
1059 if (!alg_mkey) {
1060 found = 0;
1061 break;
1062 }
1063 } else
1064 alg_mkey = ca_list[j]->algorithm_mkey;
1065 }
1066
1067 if (ca_list[j]->algorithm_auth) {
1068 if (alg_auth) {
1069 alg_auth &= ca_list[j]->algorithm_auth;
1070 if (!alg_auth) {
1071 found = 0;
1072 break;
1073 }
1074 } else
1075 alg_auth = ca_list[j]->algorithm_auth;
1076 }
1077
1078 if (ca_list[j]->algorithm_enc) {
1079 if (alg_enc) {
1080 alg_enc &= ca_list[j]->algorithm_enc;
1081 if (!alg_enc) {
1082 found = 0;
1083 break;
1084 }
1085 } else
1086 alg_enc = ca_list[j]->algorithm_enc;
1087 }
1088
1089 if (ca_list[j]->algorithm_mac) {
1090 if (alg_mac) {
1091 alg_mac &= ca_list[j]->algorithm_mac;
1092 if (!alg_mac) {
1093 found = 0;
1094 break;
1095 }
1096 } else
1097 alg_mac = ca_list[j]->algorithm_mac;
1098 }
1099
1100 if (ca_list[j]->algo_strength & SSL_STRONG_MASK) {
1101 if (algo_strength & SSL_STRONG_MASK) {
1102 algo_strength &=
1103 (ca_list[j]->algo_strength &
1104 SSL_STRONG_MASK) | ~SSL_STRONG_MASK;
1105 if (!(algo_strength &
1106 SSL_STRONG_MASK)) {
1107 found = 0;
1108 break;
1109 }
1110 } else
1111 algo_strength |=
1112 ca_list[j]->algo_strength &
1113 SSL_STRONG_MASK;
1114 }
1115
1116 if (ca_list[j]->valid) {
1117 /*
1118 * explicit ciphersuite found; its protocol
1119 * version does not become part of the search
1120 * pattern!
1121 */
1122 cipher_id = ca_list[j]->id;
1123 if (ca_list[j]->algorithm_ssl == SSL_TLSV1_3)
1124 *tls13_seen = 1;
1125 } else {
1126 /*
1127 * not an explicit ciphersuite; only in this
1128 * case, the protocol version is considered
1129 * part of the search pattern
1130 */
1131 if (ca_list[j]->algorithm_ssl) {
1132 if (alg_ssl) {
1133 alg_ssl &=
1134 ca_list[j]->algorithm_ssl;
1135 if (!alg_ssl) {
1136 found = 0;
1137 break;
1138 }
1139 } else
1140 alg_ssl =
1141 ca_list[j]->algorithm_ssl;
1142 }
1143 }
1144
1145 if (!multi)
1146 break;
1147 }
1148
1149 /*
1150 * Ok, we have the rule, now apply it
1151 */
1152 if (rule == CIPHER_SPECIAL) {
1153 /* special command */
1154 ok = 0;
1155 if (buflen == 8 && strncmp(buf, "STRENGTH", 8) == 0) {
1156 ok = ssl_cipher_strength_sort(head_p, tail_p);
1157 } else if (buflen == 10 &&
1158 strncmp(buf, "SECLEVEL=", 9) == 0) {
1159 int level = buf[9] - '0';
1160
1161 if (level >= 0 && level <= 5) {
1162 cert->security_level = level;
1163 ok = 1;
1164 } else {
1165 SSLerrorx(SSL_R_INVALID_COMMAND);
1166 }
1167 } else {
1168 SSLerrorx(SSL_R_INVALID_COMMAND);
1169 }
1170 if (ok == 0)
1171 retval = 0;
1172
1173 while ((*l != '\0') && !ITEM_SEP(*l))
1174 l++;
1175 } else if (found) {
1176 if (alg_ssl == SSL_TLSV1_3)
1177 *tls13_seen = 1;
1178 ssl_cipher_apply_rule(cipher_id, alg_mkey, alg_auth,
1179 alg_enc, alg_mac, alg_ssl, algo_strength, rule,
1180 -1, head_p, tail_p);
1181 } else {
1182 while ((*l != '\0') && !ITEM_SEP(*l))
1183 l++;
1184 }
1185 if (*l == '\0')
1186 break; /* done */
1187 }
1188
1189 return (retval);
1190}
1191
1192static inline int
1193ssl_aes_is_accelerated(void)
1194{
1195#if defined(__i386__) || defined(__x86_64__)
1196 return ((OPENSSL_cpu_caps() & (1ULL << 57)) != 0);
1197#else
1198 return (0);
1199#endif
1200}
1201
1202STACK_OF(SSL_CIPHER) *
1203ssl_create_cipher_list(const SSL_METHOD *ssl_method,
1204 STACK_OF(SSL_CIPHER) **cipher_list,
1205 STACK_OF(SSL_CIPHER) *cipher_list_tls13,
1206 const char *rule_str, SSL_CERT *cert)
1207{
1208 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
1209 unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl;
1210 STACK_OF(SSL_CIPHER) *cipherstack = NULL, *ret = NULL;
1211 const char *rule_p;
1212 CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
1213 const SSL_CIPHER **ca_list = NULL;
1214 const SSL_CIPHER *cipher;
1215 int tls13_seen = 0;
1216 int any_active;
1217 int i;
1218
1219 /*
1220 * Return with error if nothing to do.
1221 */
1222 if (rule_str == NULL || cipher_list == NULL)
1223 goto err;
1224
1225 /*
1226 * To reduce the work to do we only want to process the compiled
1227 * in algorithms, so we first get the mask of disabled ciphers.
1228 */
1229 ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl);
1230
1231 /*
1232 * Now we have to collect the available ciphers from the compiled
1233 * in ciphers. We cannot get more than the number compiled in, so
1234 * it is used for allocation.
1235 */
1236 num_of_ciphers = ssl3_num_ciphers();
1237 co_list = reallocarray(NULL, num_of_ciphers, sizeof(CIPHER_ORDER));
1238 if (co_list == NULL) {
1239 SSLerrorx(ERR_R_MALLOC_FAILURE);
1240 goto err;
1241 }
1242
1243 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers,
1244 disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl,
1245 co_list, &head, &tail);
1246
1247
1248 /* Now arrange all ciphers by preference: */
1249
1250 /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */
1251 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1252 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1253
1254 if (ssl_aes_is_accelerated()) {
1255 /*
1256 * We have hardware assisted AES - prefer AES as a symmetric
1257 * cipher, with CHACHA20 second.
1258 */
1259 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0,
1260 CIPHER_ADD, -1, &head, &tail);
1261 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305,
1262 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1263 } else {
1264 /*
1265 * CHACHA20 is fast and safe on all hardware and is thus our
1266 * preferred symmetric cipher, with AES second.
1267 */
1268 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305,
1269 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1270 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0,
1271 CIPHER_ADD, -1, &head, &tail);
1272 }
1273
1274 /* Temporarily enable everything else for sorting */
1275 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1276
1277 /* Low priority for MD5 */
1278 ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail);
1279
1280 /* Move anonymous ciphers to the end. Usually, these will remain disabled.
1281 * (For applications that allow them, they aren't too bad, but we prefer
1282 * authenticated ciphers.) */
1283 ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1284
1285 /* Move ciphers without forward secrecy to the end */
1286 ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1287
1288 /* RC4 is sort of broken - move it to the end */
1289 ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1290
1291 /* Now sort by symmetric encryption strength. The above ordering remains
1292 * in force within each class */
1293 if (!ssl_cipher_strength_sort(&head, &tail))
1294 goto err;
1295
1296 /* Now disable everything (maintaining the ordering!) */
1297 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1298
1299 /* TLSv1.3 first. */
1300 ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_ADD, -1, &head, &tail);
1301 ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_DEL, -1, &head, &tail);
1302
1303 /*
1304 * We also need cipher aliases for selecting based on the rule_str.
1305 * There might be two types of entries in the rule_str: 1) names
1306 * of ciphers themselves 2) aliases for groups of ciphers.
1307 * For 1) we need the available ciphers and for 2) the cipher
1308 * groups of cipher_aliases added together in one list (otherwise
1309 * we would be happy with just the cipher_aliases table).
1310 */
1311 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
1312 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
1313 ca_list = reallocarray(NULL, num_of_alias_max, sizeof(SSL_CIPHER *));
1314 if (ca_list == NULL) {
1315 SSLerrorx(ERR_R_MALLOC_FAILURE);
1316 goto err;
1317 }
1318 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mkey,
1319 disabled_auth, disabled_enc, disabled_mac, disabled_ssl, head);
1320
1321 /*
1322 * If the rule_string begins with DEFAULT, apply the default rule
1323 * before using the (possibly available) additional rules.
1324 */
1325 ok = 1;
1326 rule_p = rule_str;
1327 if (strncmp(rule_str, "DEFAULT", 7) == 0) {
1328 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
1329 &head, &tail, ca_list, cert, &tls13_seen);
1330 rule_p += 7;
1331 if (*rule_p == ':')
1332 rule_p++;
1333 }
1334
1335 if (ok && (strlen(rule_p) > 0))
1336 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list,
1337 cert, &tls13_seen);
1338
1339 if (!ok) {
1340 /* Rule processing failure */
1341 goto err;
1342 }
1343
1344 /*
1345 * Allocate new "cipherstack" for the result, return with error
1346 * if we cannot get one.
1347 */
1348 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) {
1349 SSLerrorx(ERR_R_MALLOC_FAILURE);
1350 goto err;
1351 }
1352
1353 /* Prefer TLSv1.3 cipher suites. */
1354 if (cipher_list_tls13 != NULL) {
1355 for (i = 0; i < sk_SSL_CIPHER_num(cipher_list_tls13); i++) {
1356 cipher = sk_SSL_CIPHER_value(cipher_list_tls13, i);
1357 if (!sk_SSL_CIPHER_push(cipherstack, cipher)) {
1358 SSLerrorx(ERR_R_MALLOC_FAILURE);
1359 goto err;
1360 }
1361 }
1362 tls13_seen = 1;
1363 }
1364
1365 /*
1366 * The cipher selection for the list is done. The ciphers are added
1367 * to the resulting precedence to the STACK_OF(SSL_CIPHER).
1368 *
1369 * If the rule string did not contain any references to TLSv1.3 and
1370 * TLSv1.3 cipher suites have not been configured separately,
1371 * include inactive TLSv1.3 cipher suites. This avoids attempts to
1372 * use TLSv1.3 with an older rule string that does not include
1373 * TLSv1.3 cipher suites. If the rule string resulted in no active
1374 * cipher suites then we return an empty stack.
1375 */
1376 any_active = 0;
1377 for (curr = head; curr != NULL; curr = curr->next) {
1378 if (curr->active ||
1379 (!tls13_seen && curr->cipher->algorithm_ssl == SSL_TLSV1_3)) {
1380 if (!sk_SSL_CIPHER_push(cipherstack, curr->cipher)) {
1381 SSLerrorx(ERR_R_MALLOC_FAILURE);
1382 goto err;
1383 }
1384 }
1385 any_active |= curr->active;
1386 }
1387 if (!any_active)
1388 sk_SSL_CIPHER_zero(cipherstack);
1389
1390 sk_SSL_CIPHER_free(*cipher_list);
1391 *cipher_list = cipherstack;
1392 cipherstack = NULL;
1393
1394 ret = *cipher_list;
1395
1396 err:
1397 sk_SSL_CIPHER_free(cipherstack);
1398 free((void *)ca_list);
1399 free(co_list);
1400
1401 return ret;
1402}
1403
1404const SSL_CIPHER *
1405SSL_CIPHER_get_by_id(unsigned int id)
1406{
1407 return ssl3_get_cipher_by_id(id);
1408}
1409
1410const SSL_CIPHER *
1411SSL_CIPHER_get_by_value(uint16_t value)
1412{
1413 return ssl3_get_cipher_by_value(value);
1414}
1415
1416char *
1417SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len)
1418{
1419 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, alg2;
1420 const char *ver, *kx, *au, *enc, *mac;
1421 char *ret;
1422 int l;
1423
1424 alg_mkey = cipher->algorithm_mkey;
1425 alg_auth = cipher->algorithm_auth;
1426 alg_enc = cipher->algorithm_enc;
1427 alg_mac = cipher->algorithm_mac;
1428 alg_ssl = cipher->algorithm_ssl;
1429
1430 alg2 = cipher->algorithm2;
1431
1432 if (alg_ssl & SSL_SSLV3)
1433 ver = "SSLv3";
1434 else if (alg_ssl & SSL_TLSV1_2)
1435 ver = "TLSv1.2";
1436 else if (alg_ssl & SSL_TLSV1_3)
1437 ver = "TLSv1.3";
1438 else
1439 ver = "unknown";
1440
1441 switch (alg_mkey) {
1442 case SSL_kRSA:
1443 kx = "RSA";
1444 break;
1445 case SSL_kDHE:
1446 kx = "DH";
1447 break;
1448 case SSL_kECDHE:
1449 kx = "ECDH";
1450 break;
1451 case SSL_kGOST:
1452 kx = "GOST";
1453 break;
1454 case SSL_kTLS1_3:
1455 kx = "TLSv1.3";
1456 break;
1457 default:
1458 kx = "unknown";
1459 }
1460
1461 switch (alg_auth) {
1462 case SSL_aRSA:
1463 au = "RSA";
1464 break;
1465 case SSL_aDSS:
1466 au = "DSS";
1467 break;
1468 case SSL_aNULL:
1469 au = "None";
1470 break;
1471 case SSL_aECDSA:
1472 au = "ECDSA";
1473 break;
1474 case SSL_aGOST01:
1475 au = "GOST01";
1476 break;
1477 case SSL_aTLS1_3:
1478 au = "TLSv1.3";
1479 break;
1480 default:
1481 au = "unknown";
1482 break;
1483 }
1484
1485 switch (alg_enc) {
1486 case SSL_3DES:
1487 enc = "3DES(168)";
1488 break;
1489 case SSL_RC4:
1490 enc = alg2 & SSL2_CF_8_BYTE_ENC ? "RC4(64)" : "RC4(128)";
1491 break;
1492 case SSL_eNULL:
1493 enc = "None";
1494 break;
1495 case SSL_AES128:
1496 enc = "AES(128)";
1497 break;
1498 case SSL_AES256:
1499 enc = "AES(256)";
1500 break;
1501 case SSL_AES128GCM:
1502 enc = "AESGCM(128)";
1503 break;
1504 case SSL_AES256GCM:
1505 enc = "AESGCM(256)";
1506 break;
1507 case SSL_CAMELLIA128:
1508 enc = "Camellia(128)";
1509 break;
1510 case SSL_CAMELLIA256:
1511 enc = "Camellia(256)";
1512 break;
1513 case SSL_CHACHA20POLY1305:
1514 enc = "ChaCha20-Poly1305";
1515 break;
1516 case SSL_eGOST2814789CNT:
1517 enc = "GOST-28178-89-CNT";
1518 break;
1519 default:
1520 enc = "unknown";
1521 break;
1522 }
1523
1524 switch (alg_mac) {
1525 case SSL_MD5:
1526 mac = "MD5";
1527 break;
1528 case SSL_SHA1:
1529 mac = "SHA1";
1530 break;
1531 case SSL_SHA256:
1532 mac = "SHA256";
1533 break;
1534 case SSL_SHA384:
1535 mac = "SHA384";
1536 break;
1537 case SSL_AEAD:
1538 mac = "AEAD";
1539 break;
1540 case SSL_GOST94:
1541 mac = "GOST94";
1542 break;
1543 case SSL_GOST89MAC:
1544 mac = "GOST89IMIT";
1545 break;
1546 case SSL_STREEBOG256:
1547 mac = "STREEBOG256";
1548 break;
1549 default:
1550 mac = "unknown";
1551 break;
1552 }
1553
1554 if (asprintf(&ret, "%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s\n",
1555 cipher->name, ver, kx, au, enc, mac) == -1)
1556 return "OPENSSL_malloc Error";
1557
1558 if (buf != NULL) {
1559 l = strlcpy(buf, ret, len);
1560 free(ret);
1561 ret = buf;
1562 if (l >= len)
1563 ret = "Buffer too small";
1564 }
1565
1566 return (ret);
1567}
1568
1569const char *
1570SSL_CIPHER_get_version(const SSL_CIPHER *c)
1571{
1572 if (c == NULL)
1573 return("(NONE)");
1574 if ((c->id >> 24) == 3)
1575 return("TLSv1/SSLv3");
1576 else
1577 return("unknown");
1578}
1579
1580/* return the actual cipher being used */
1581const char *
1582SSL_CIPHER_get_name(const SSL_CIPHER *c)
1583{
1584 if (c != NULL)
1585 return (c->name);
1586 return("(NONE)");
1587}
1588
1589/* number of bits for symmetric cipher */
1590int
1591SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
1592{
1593 int ret = 0;
1594
1595 if (c != NULL) {
1596 if (alg_bits != NULL)
1597 *alg_bits = c->alg_bits;
1598 ret = c->strength_bits;
1599 }
1600 return (ret);
1601}
1602
1603unsigned long
1604SSL_CIPHER_get_id(const SSL_CIPHER *c)
1605{
1606 return c->id;
1607}
1608
1609uint16_t
1610SSL_CIPHER_get_value(const SSL_CIPHER *c)
1611{
1612 return ssl3_cipher_get_value(c);
1613}
1614
1615const SSL_CIPHER *
1616SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr)
1617{
1618 uint16_t cipher_value;
1619 CBS cbs;
1620
1621 /* This API is documented with ptr being an array of length two. */
1622 CBS_init(&cbs, ptr, 2);
1623 if (!CBS_get_u16(&cbs, &cipher_value))
1624 return NULL;
1625
1626 return ssl3_get_cipher_by_value(cipher_value);
1627}
1628
1629int
1630SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c)
1631{
1632 switch (c->algorithm_enc) {
1633 case SSL_eNULL:
1634 return NID_undef;
1635 case SSL_3DES:
1636 return NID_des_ede3_cbc;
1637 case SSL_AES128:
1638 return NID_aes_128_cbc;
1639 case SSL_AES128GCM:
1640 return NID_aes_128_gcm;
1641 case SSL_AES256:
1642 return NID_aes_256_cbc;
1643 case SSL_AES256GCM:
1644 return NID_aes_256_gcm;
1645 case SSL_CAMELLIA128:
1646 return NID_camellia_128_cbc;
1647 case SSL_CAMELLIA256:
1648 return NID_camellia_256_cbc;
1649 case SSL_CHACHA20POLY1305:
1650 return NID_chacha20_poly1305;
1651 case SSL_DES:
1652 return NID_des_cbc;
1653 case SSL_RC4:
1654 return NID_rc4;
1655 case SSL_eGOST2814789CNT:
1656 return NID_gost89_cnt;
1657 default:
1658 return NID_undef;
1659 }
1660}
1661
1662int
1663SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c)
1664{
1665 switch (c->algorithm_mac) {
1666 case SSL_AEAD:
1667 return NID_undef;
1668 case SSL_GOST89MAC:
1669 return NID_id_Gost28147_89_MAC;
1670 case SSL_GOST94:
1671 return NID_id_GostR3411_94;
1672 case SSL_MD5:
1673 return NID_md5;
1674 case SSL_SHA1:
1675 return NID_sha1;
1676 case SSL_SHA256:
1677 return NID_sha256;
1678 case SSL_SHA384:
1679 return NID_sha384;
1680 case SSL_STREEBOG256:
1681 return NID_id_tc26_gost3411_2012_256;
1682 default:
1683 return NID_undef;
1684 }
1685}
1686
1687int
1688SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c)
1689{
1690 switch (c->algorithm_mkey) {
1691 case SSL_kDHE:
1692 return NID_kx_dhe;
1693 case SSL_kECDHE:
1694 return NID_kx_ecdhe;
1695 case SSL_kGOST:
1696 return NID_kx_gost;
1697 case SSL_kRSA:
1698 return NID_kx_rsa;
1699 default:
1700 return NID_undef;
1701 }
1702}
1703
1704int
1705SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c)
1706{
1707 switch (c->algorithm_auth) {
1708 case SSL_aNULL:
1709 return NID_auth_null;
1710 case SSL_aECDSA:
1711 return NID_auth_ecdsa;
1712 case SSL_aGOST01:
1713 return NID_auth_gost01;
1714 case SSL_aRSA:
1715 return NID_auth_rsa;
1716 default:
1717 return NID_undef;
1718 }
1719}
1720
1721int
1722SSL_CIPHER_is_aead(const SSL_CIPHER *c)
1723{
1724 return (c->algorithm_mac & SSL_AEAD) == SSL_AEAD;
1725}
1726
1727void *
1728SSL_COMP_get_compression_methods(void)
1729{
1730 return NULL;
1731}
1732
1733int
1734SSL_COMP_add_compression_method(int id, void *cm)
1735{
1736 return 1;
1737}
1738
1739const char *
1740SSL_COMP_get_name(const void *comp)
1741{
1742 return NULL;
1743}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2026-02-11 16:57:40 +0000