1 /* $OpenBSD: ssl_ciph.c,v 1.137 2023/11/19 15:51:49 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 #include "ssl_local.h" 149 150 #define CIPHER_ADD 1 151 #define CIPHER_KILL 2 152 #define CIPHER_DEL 3 153 #define CIPHER_ORD 4 154 #define CIPHER_SPECIAL 5 155 156 typedef struct cipher_order_st { 157 const SSL_CIPHER *cipher; 158 int active; 159 int dead; 160 struct cipher_order_st *next, *prev; 161 } CIPHER_ORDER; 162 163 static const SSL_CIPHER cipher_aliases[] = { 164 165 /* "ALL" doesn't include eNULL (must be specifically enabled) */ 166 { 167 .name = SSL_TXT_ALL, 168 .algorithm_enc = ~SSL_eNULL, 169 }, 170 171 /* "COMPLEMENTOFALL" */ 172 { 173 .name = SSL_TXT_CMPALL, 174 .algorithm_enc = SSL_eNULL, 175 }, 176 177 /* 178 * "COMPLEMENTOFDEFAULT" 179 * (does *not* include ciphersuites not found in ALL!) 180 */ 181 { 182 .name = SSL_TXT_CMPDEF, 183 .algorithm_mkey = SSL_kDHE|SSL_kECDHE, 184 .algorithm_auth = SSL_aNULL, 185 .algorithm_enc = ~SSL_eNULL, 186 }, 187 188 /* 189 * key exchange aliases 190 * (some of those using only a single bit here combine multiple key 191 * exchange algs according to the RFCs, e.g. kEDH combines DHE_DSS 192 * and DHE_RSA) 193 */ 194 { 195 .name = SSL_TXT_kRSA, 196 .algorithm_mkey = SSL_kRSA, 197 }, 198 { 199 .name = SSL_TXT_kEDH, 200 .algorithm_mkey = SSL_kDHE, 201 }, 202 { 203 .name = SSL_TXT_DH, 204 .algorithm_mkey = SSL_kDHE, 205 }, 206 { 207 .name = SSL_TXT_kEECDH, 208 .algorithm_mkey = SSL_kECDHE, 209 }, 210 { 211 .name = SSL_TXT_ECDH, 212 .algorithm_mkey = SSL_kECDHE, 213 }, 214 { 215 .name = SSL_TXT_kGOST, 216 .algorithm_mkey = SSL_kGOST, 217 }, 218 219 /* server authentication aliases */ 220 { 221 .name = SSL_TXT_aRSA, 222 .algorithm_auth = SSL_aRSA, 223 }, 224 { 225 .name = SSL_TXT_aDSS, 226 .algorithm_auth = SSL_aDSS, 227 }, 228 { 229 .name = SSL_TXT_DSS, 230 .algorithm_auth = SSL_aDSS, 231 }, 232 { 233 .name = SSL_TXT_aNULL, 234 .algorithm_auth = SSL_aNULL, 235 }, 236 { 237 .name = SSL_TXT_aECDSA, 238 .algorithm_auth = SSL_aECDSA, 239 }, 240 { 241 .name = SSL_TXT_ECDSA, 242 .algorithm_auth = SSL_aECDSA, 243 }, 244 { 245 .name = SSL_TXT_aGOST01, 246 .algorithm_auth = SSL_aGOST01, 247 }, 248 { 249 .name = SSL_TXT_aGOST, 250 .algorithm_auth = SSL_aGOST01, 251 }, 252 253 /* aliases combining key exchange and server authentication */ 254 { 255 .name = SSL_TXT_DHE, 256 .algorithm_mkey = SSL_kDHE, 257 .algorithm_auth = ~SSL_aNULL, 258 }, 259 { 260 .name = SSL_TXT_EDH, 261 .algorithm_mkey = SSL_kDHE, 262 .algorithm_auth = ~SSL_aNULL, 263 }, 264 { 265 .name = SSL_TXT_ECDHE, 266 .algorithm_mkey = SSL_kECDHE, 267 .algorithm_auth = ~SSL_aNULL, 268 }, 269 { 270 .name = SSL_TXT_EECDH, 271 .algorithm_mkey = SSL_kECDHE, 272 .algorithm_auth = ~SSL_aNULL, 273 }, 274 { 275 .name = SSL_TXT_NULL, 276 .algorithm_enc = SSL_eNULL, 277 }, 278 { 279 .name = SSL_TXT_RSA, 280 .algorithm_mkey = SSL_kRSA, 281 .algorithm_auth = SSL_aRSA, 282 }, 283 { 284 .name = SSL_TXT_ADH, 285 .algorithm_mkey = SSL_kDHE, 286 .algorithm_auth = SSL_aNULL, 287 }, 288 { 289 .name = SSL_TXT_AECDH, 290 .algorithm_mkey = SSL_kECDHE, 291 .algorithm_auth = SSL_aNULL, 292 }, 293 294 /* symmetric encryption aliases */ 295 { 296 .name = SSL_TXT_3DES, 297 .algorithm_enc = SSL_3DES, 298 }, 299 { 300 .name = SSL_TXT_RC4, 301 .algorithm_enc = SSL_RC4, 302 }, 303 { 304 .name = SSL_TXT_eNULL, 305 .algorithm_enc = SSL_eNULL, 306 }, 307 { 308 .name = SSL_TXT_AES128, 309 .algorithm_enc = SSL_AES128|SSL_AES128GCM, 310 }, 311 { 312 .name = SSL_TXT_AES256, 313 .algorithm_enc = SSL_AES256|SSL_AES256GCM, 314 }, 315 { 316 .name = SSL_TXT_AES, 317 .algorithm_enc = SSL_AES, 318 }, 319 { 320 .name = SSL_TXT_AES_GCM, 321 .algorithm_enc = SSL_AES128GCM|SSL_AES256GCM, 322 }, 323 { 324 .name = SSL_TXT_CAMELLIA128, 325 .algorithm_enc = SSL_CAMELLIA128, 326 }, 327 { 328 .name = SSL_TXT_CAMELLIA256, 329 .algorithm_enc = SSL_CAMELLIA256, 330 }, 331 { 332 .name = SSL_TXT_CAMELLIA, 333 .algorithm_enc = SSL_CAMELLIA128|SSL_CAMELLIA256, 334 }, 335 { 336 .name = SSL_TXT_CHACHA20, 337 .algorithm_enc = SSL_CHACHA20POLY1305, 338 }, 339 340 /* MAC aliases */ 341 { 342 .name = SSL_TXT_AEAD, 343 .algorithm_mac = SSL_AEAD, 344 }, 345 { 346 .name = SSL_TXT_MD5, 347 .algorithm_mac = SSL_MD5, 348 }, 349 { 350 .name = SSL_TXT_SHA1, 351 .algorithm_mac = SSL_SHA1, 352 }, 353 { 354 .name = SSL_TXT_SHA, 355 .algorithm_mac = SSL_SHA1, 356 }, 357 { 358 .name = SSL_TXT_GOST94, 359 .algorithm_mac = SSL_GOST94, 360 }, 361 { 362 .name = SSL_TXT_GOST89MAC, 363 .algorithm_mac = SSL_GOST89MAC, 364 }, 365 { 366 .name = SSL_TXT_SHA256, 367 .algorithm_mac = SSL_SHA256, 368 }, 369 { 370 .name = SSL_TXT_SHA384, 371 .algorithm_mac = SSL_SHA384, 372 }, 373 { 374 .name = SSL_TXT_STREEBOG256, 375 .algorithm_mac = SSL_STREEBOG256, 376 }, 377 378 /* protocol version aliases */ 379 { 380 .name = SSL_TXT_SSLV3, 381 .algorithm_ssl = SSL_SSLV3, 382 }, 383 { 384 .name = SSL_TXT_TLSV1, 385 .algorithm_ssl = SSL_TLSV1, 386 }, 387 { 388 .name = SSL_TXT_TLSV1_2, 389 .algorithm_ssl = SSL_TLSV1_2, 390 }, 391 { 392 .name = SSL_TXT_TLSV1_3, 393 .algorithm_ssl = SSL_TLSV1_3, 394 }, 395 396 /* cipher suite aliases */ 397 #ifdef LIBRESSL_HAS_TLS1_3 398 { 399 .valid = 1, 400 .name = "TLS_AES_128_GCM_SHA256", 401 .id = TLS1_3_CK_AES_128_GCM_SHA256, 402 .algorithm_ssl = SSL_TLSV1_3, 403 }, 404 { 405 .valid = 1, 406 .name = "TLS_AES_256_GCM_SHA384", 407 .id = TLS1_3_CK_AES_256_GCM_SHA384, 408 .algorithm_ssl = SSL_TLSV1_3, 409 }, 410 { 411 .valid = 1, 412 .name = "TLS_CHACHA20_POLY1305_SHA256", 413 .id = TLS1_3_CK_CHACHA20_POLY1305_SHA256, 414 .algorithm_ssl = SSL_TLSV1_3, 415 }, 416 #endif 417 418 /* strength classes */ 419 { 420 .name = SSL_TXT_LOW, 421 .algo_strength = SSL_LOW, 422 }, 423 { 424 .name = SSL_TXT_MEDIUM, 425 .algo_strength = SSL_MEDIUM, 426 }, 427 { 428 .name = SSL_TXT_HIGH, 429 .algo_strength = SSL_HIGH, 430 }, 431 }; 432 433 int 434 ssl_cipher_get_evp(const SSL_SESSION *ss, const EVP_CIPHER **enc, 435 const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size) 436 { 437 *enc = NULL; 438 *md = NULL; 439 *mac_pkey_type = NID_undef; 440 *mac_secret_size = 0; 441 442 if (ss->cipher == NULL) 443 return 0; 444 445 /* 446 * This function does not handle EVP_AEAD. 447 * See ssl_cipher_get_evp_aead instead. 448 */ 449 if (ss->cipher->algorithm_mac & SSL_AEAD) 450 return 0; 451 452 switch (ss->cipher->algorithm_enc) { 453 case SSL_3DES: 454 *enc = EVP_des_ede3_cbc(); 455 break; 456 case SSL_RC4: 457 *enc = EVP_rc4(); 458 break; 459 case SSL_eNULL: 460 *enc = EVP_enc_null(); 461 break; 462 case SSL_AES128: 463 *enc = EVP_aes_128_cbc(); 464 break; 465 case SSL_AES256: 466 *enc = EVP_aes_256_cbc(); 467 break; 468 case SSL_CAMELLIA128: 469 *enc = EVP_camellia_128_cbc(); 470 break; 471 case SSL_CAMELLIA256: 472 *enc = EVP_camellia_256_cbc(); 473 break; 474 #ifndef OPENSSL_NO_GOST 475 case SSL_eGOST2814789CNT: 476 *enc = EVP_gost2814789_cnt(); 477 break; 478 #endif 479 } 480 481 switch (ss->cipher->algorithm_mac) { 482 case SSL_MD5: 483 *md = EVP_md5(); 484 break; 485 case SSL_SHA1: 486 *md = EVP_sha1(); 487 break; 488 case SSL_SHA256: 489 *md = EVP_sha256(); 490 break; 491 case SSL_SHA384: 492 *md = EVP_sha384(); 493 break; 494 #ifndef OPENSSL_NO_GOST 495 case SSL_GOST89MAC: 496 *md = EVP_gost2814789imit(); 497 break; 498 case SSL_GOST94: 499 *md = EVP_gostr341194(); 500 break; 501 case SSL_STREEBOG256: 502 *md = EVP_streebog256(); 503 break; 504 #endif 505 } 506 if (*enc == NULL || *md == NULL) 507 return 0; 508 509 /* 510 * EVP_CIPH_FLAG_AEAD_CIPHER and EVP_CIPH_GCM_MODE ciphers are not 511 * supported via EVP_CIPHER (they should be using EVP_AEAD instead). 512 */ 513 if (EVP_CIPHER_flags(*enc) & EVP_CIPH_FLAG_AEAD_CIPHER) 514 return 0; 515 if (EVP_CIPHER_mode(*enc) == EVP_CIPH_GCM_MODE) 516 return 0; 517 #ifndef OPENSSL_NO_GOST 518 /* XXX JFC. die in fire already */ 519 if (ss->cipher->algorithm_mac == SSL_GOST89MAC) { 520 *mac_pkey_type = EVP_PKEY_GOSTIMIT; 521 *mac_secret_size = 32; /* XXX */ 522 } else { 523 #endif 524 *mac_pkey_type = EVP_PKEY_HMAC; 525 *mac_secret_size = EVP_MD_size(*md); 526 #ifndef OPENSSL_NO_GOST 527 } 528 #endif 529 return 1; 530 } 531 532 /* 533 * ssl_cipher_get_evp_aead sets aead to point to the correct EVP_AEAD object 534 * for s->cipher. It returns 1 on success and 0 on error. 535 */ 536 int 537 ssl_cipher_get_evp_aead(const SSL_SESSION *ss, const EVP_AEAD **aead) 538 { 539 *aead = NULL; 540 541 if (ss->cipher == NULL) 542 return 0; 543 if ((ss->cipher->algorithm_mac & SSL_AEAD) == 0) 544 return 0; 545 546 switch (ss->cipher->algorithm_enc) { 547 case SSL_AES128GCM: 548 *aead = EVP_aead_aes_128_gcm(); 549 return 1; 550 case SSL_AES256GCM: 551 *aead = EVP_aead_aes_256_gcm(); 552 return 1; 553 case SSL_CHACHA20POLY1305: 554 *aead = EVP_aead_chacha20_poly1305(); 555 return 1; 556 default: 557 break; 558 } 559 return 0; 560 } 561 562 int 563 ssl_get_handshake_evp_md(SSL *s, const EVP_MD **md) 564 { 565 unsigned long handshake_mac; 566 567 *md = NULL; 568 569 if (s->s3->hs.cipher == NULL) 570 return 0; 571 572 handshake_mac = s->s3->hs.cipher->algorithm2 & 573 SSL_HANDSHAKE_MAC_MASK; 574 575 /* For TLSv1.2 we upgrade the default MD5+SHA1 MAC to SHA256. */ 576 if (SSL_USE_SHA256_PRF(s) && handshake_mac == SSL_HANDSHAKE_MAC_DEFAULT) 577 handshake_mac = SSL_HANDSHAKE_MAC_SHA256; 578 579 switch (handshake_mac) { 580 case SSL_HANDSHAKE_MAC_DEFAULT: 581 *md = EVP_md5_sha1(); 582 return 1; 583 #ifndef OPENSSL_NO_GOST 584 case SSL_HANDSHAKE_MAC_GOST94: 585 *md = EVP_gostr341194(); 586 return 1; 587 case SSL_HANDSHAKE_MAC_STREEBOG256: 588 *md = EVP_streebog256(); 589 return 1; 590 #endif 591 case SSL_HANDSHAKE_MAC_SHA256: 592 *md = EVP_sha256(); 593 return 1; 594 case SSL_HANDSHAKE_MAC_SHA384: 595 *md = EVP_sha384(); 596 return 1; 597 default: 598 break; 599 } 600 601 return 0; 602 } 603 604 #define ITEM_SEP(a) \ 605 (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ',')) 606 607 static void 608 ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr, 609 CIPHER_ORDER **tail) 610 { 611 if (curr == *tail) 612 return; 613 if (curr == *head) 614 *head = curr->next; 615 if (curr->prev != NULL) 616 curr->prev->next = curr->next; 617 if (curr->next != NULL) 618 curr->next->prev = curr->prev; 619 (*tail)->next = curr; 620 curr->prev= *tail; 621 curr->next = NULL; 622 *tail = curr; 623 } 624 625 static void 626 ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr, 627 CIPHER_ORDER **tail) 628 { 629 if (curr == *head) 630 return; 631 if (curr == *tail) 632 *tail = curr->prev; 633 if (curr->next != NULL) 634 curr->next->prev = curr->prev; 635 if (curr->prev != NULL) 636 curr->prev->next = curr->next; 637 (*head)->prev = curr; 638 curr->next= *head; 639 curr->prev = NULL; 640 *head = curr; 641 } 642 643 static void 644 ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth, 645 unsigned long *enc, unsigned long *mac, unsigned long *ssl) 646 { 647 *mkey = 0; 648 *auth = 0; 649 *enc = 0; 650 *mac = 0; 651 *ssl = 0; 652 653 /* 654 * Check for the availability of GOST 34.10 public/private key 655 * algorithms. If they are not available disable the associated 656 * authentication and key exchange algorithms. 657 */ 658 if (EVP_PKEY_meth_find(NID_id_GostR3410_2001) == NULL) { 659 *auth |= SSL_aGOST01; 660 *mkey |= SSL_kGOST; 661 } 662 663 #ifdef SSL_FORBID_ENULL 664 *enc |= SSL_eNULL; 665 #endif 666 } 667 668 static void 669 ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method, int num_of_ciphers, 670 unsigned long disabled_mkey, unsigned long disabled_auth, 671 unsigned long disabled_enc, unsigned long disabled_mac, 672 unsigned long disabled_ssl, CIPHER_ORDER *co_list, 673 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 674 { 675 int i, co_list_num; 676 const SSL_CIPHER *c; 677 678 /* 679 * We have num_of_ciphers descriptions compiled in, depending on the 680 * method selected (SSLv3, TLSv1, etc). These will later be sorted in 681 * a linked list with at most num entries. 682 */ 683 684 /* Get the initial list of ciphers */ 685 co_list_num = 0; /* actual count of ciphers */ 686 for (i = 0; i < num_of_ciphers; i++) { 687 c = ssl_method->get_cipher(i); 688 /* 689 * Drop any invalid ciphers and any which use unavailable 690 * algorithms. 691 */ 692 if ((c != NULL) && c->valid && 693 !(c->algorithm_mkey & disabled_mkey) && 694 !(c->algorithm_auth & disabled_auth) && 695 !(c->algorithm_enc & disabled_enc) && 696 !(c->algorithm_mac & disabled_mac) && 697 !(c->algorithm_ssl & disabled_ssl)) { 698 co_list[co_list_num].cipher = c; 699 co_list[co_list_num].next = NULL; 700 co_list[co_list_num].prev = NULL; 701 co_list[co_list_num].active = 0; 702 co_list_num++; 703 } 704 } 705 706 /* 707 * Prepare linked list from list entries 708 */ 709 if (co_list_num > 0) { 710 co_list[0].prev = NULL; 711 712 if (co_list_num > 1) { 713 co_list[0].next = &co_list[1]; 714 715 for (i = 1; i < co_list_num - 1; i++) { 716 co_list[i].prev = &co_list[i - 1]; 717 co_list[i].next = &co_list[i + 1]; 718 } 719 720 co_list[co_list_num - 1].prev = 721 &co_list[co_list_num - 2]; 722 } 723 724 co_list[co_list_num - 1].next = NULL; 725 726 *head_p = &co_list[0]; 727 *tail_p = &co_list[co_list_num - 1]; 728 } 729 } 730 731 static void 732 ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list, int num_of_group_aliases, 733 unsigned long disabled_mkey, unsigned long disabled_auth, 734 unsigned long disabled_enc, unsigned long disabled_mac, 735 unsigned long disabled_ssl, CIPHER_ORDER *head) 736 { 737 CIPHER_ORDER *ciph_curr; 738 const SSL_CIPHER **ca_curr; 739 int i; 740 unsigned long mask_mkey = ~disabled_mkey; 741 unsigned long mask_auth = ~disabled_auth; 742 unsigned long mask_enc = ~disabled_enc; 743 unsigned long mask_mac = ~disabled_mac; 744 unsigned long mask_ssl = ~disabled_ssl; 745 746 /* 747 * First, add the real ciphers as already collected 748 */ 749 ciph_curr = head; 750 ca_curr = ca_list; 751 while (ciph_curr != NULL) { 752 *ca_curr = ciph_curr->cipher; 753 ca_curr++; 754 ciph_curr = ciph_curr->next; 755 } 756 757 /* 758 * Now we add the available ones from the cipher_aliases[] table. 759 * They represent either one or more algorithms, some of which 760 * in any affected category must be supported (set in enabled_mask), 761 * or represent a cipher strength value (will be added in any case because algorithms=0). 762 */ 763 for (i = 0; i < num_of_group_aliases; i++) { 764 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey; 765 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth; 766 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc; 767 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac; 768 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl; 769 770 if (algorithm_mkey) 771 if ((algorithm_mkey & mask_mkey) == 0) 772 continue; 773 774 if (algorithm_auth) 775 if ((algorithm_auth & mask_auth) == 0) 776 continue; 777 778 if (algorithm_enc) 779 if ((algorithm_enc & mask_enc) == 0) 780 continue; 781 782 if (algorithm_mac) 783 if ((algorithm_mac & mask_mac) == 0) 784 continue; 785 786 if (algorithm_ssl) 787 if ((algorithm_ssl & mask_ssl) == 0) 788 continue; 789 790 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i); 791 ca_curr++; 792 } 793 794 *ca_curr = NULL; /* end of list */ 795 } 796 797 static void 798 ssl_cipher_apply_rule(unsigned long cipher_id, unsigned long alg_mkey, 799 unsigned long alg_auth, unsigned long alg_enc, unsigned long alg_mac, 800 unsigned long alg_ssl, unsigned long algo_strength, int rule, 801 int strength_bits, CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 802 { 803 CIPHER_ORDER *head, *tail, *curr, *next, *last; 804 const SSL_CIPHER *cp; 805 int reverse = 0; 806 807 if (rule == CIPHER_DEL) 808 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */ 809 810 head = *head_p; 811 tail = *tail_p; 812 813 if (reverse) { 814 next = tail; 815 last = head; 816 } else { 817 next = head; 818 last = tail; 819 } 820 821 curr = NULL; 822 for (;;) { 823 if (curr == last) 824 break; 825 curr = next; 826 next = reverse ? curr->prev : curr->next; 827 828 cp = curr->cipher; 829 830 if (cipher_id && cp->id != cipher_id) 831 continue; 832 833 /* 834 * Selection criteria is either the value of strength_bits 835 * or the algorithms used. 836 */ 837 if (strength_bits >= 0) { 838 if (strength_bits != cp->strength_bits) 839 continue; 840 } else { 841 if (alg_mkey && !(alg_mkey & cp->algorithm_mkey)) 842 continue; 843 if (alg_auth && !(alg_auth & cp->algorithm_auth)) 844 continue; 845 if (alg_enc && !(alg_enc & cp->algorithm_enc)) 846 continue; 847 if (alg_mac && !(alg_mac & cp->algorithm_mac)) 848 continue; 849 if (alg_ssl && !(alg_ssl & cp->algorithm_ssl)) 850 continue; 851 if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength)) 852 continue; 853 } 854 855 /* add the cipher if it has not been added yet. */ 856 if (rule == CIPHER_ADD) { 857 /* reverse == 0 */ 858 if (!curr->active) { 859 ll_append_tail(&head, curr, &tail); 860 curr->active = 1; 861 } 862 } 863 /* Move the added cipher to this location */ 864 else if (rule == CIPHER_ORD) { 865 /* reverse == 0 */ 866 if (curr->active) { 867 ll_append_tail(&head, curr, &tail); 868 } 869 } else if (rule == CIPHER_DEL) { 870 /* reverse == 1 */ 871 if (curr->active) { 872 /* most recently deleted ciphersuites get best positions 873 * for any future CIPHER_ADD (note that the CIPHER_DEL loop 874 * works in reverse to maintain the order) */ 875 ll_append_head(&head, curr, &tail); 876 curr->active = 0; 877 } 878 } else if (rule == CIPHER_KILL) { 879 /* reverse == 0 */ 880 if (head == curr) 881 head = curr->next; 882 else 883 curr->prev->next = curr->next; 884 if (tail == curr) 885 tail = curr->prev; 886 curr->active = 0; 887 if (curr->next != NULL) 888 curr->next->prev = curr->prev; 889 if (curr->prev != NULL) 890 curr->prev->next = curr->next; 891 curr->next = NULL; 892 curr->prev = NULL; 893 } 894 } 895 896 *head_p = head; 897 *tail_p = tail; 898 } 899 900 static int 901 ssl_cipher_strength_sort(CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 902 { 903 int max_strength_bits, i, *number_uses; 904 CIPHER_ORDER *curr; 905 906 /* 907 * This routine sorts the ciphers with descending strength. The sorting 908 * must keep the pre-sorted sequence, so we apply the normal sorting 909 * routine as '+' movement to the end of the list. 910 */ 911 max_strength_bits = 0; 912 curr = *head_p; 913 while (curr != NULL) { 914 if (curr->active && 915 (curr->cipher->strength_bits > max_strength_bits)) 916 max_strength_bits = curr->cipher->strength_bits; 917 curr = curr->next; 918 } 919 920 number_uses = calloc((max_strength_bits + 1), sizeof(int)); 921 if (!number_uses) { 922 SSLerrorx(ERR_R_MALLOC_FAILURE); 923 return (0); 924 } 925 926 /* 927 * Now find the strength_bits values actually used 928 */ 929 curr = *head_p; 930 while (curr != NULL) { 931 if (curr->active) 932 number_uses[curr->cipher->strength_bits]++; 933 curr = curr->next; 934 } 935 /* 936 * Go through the list of used strength_bits values in descending 937 * order. 938 */ 939 for (i = max_strength_bits; i >= 0; i--) 940 if (number_uses[i] > 0) 941 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p); 942 943 free(number_uses); 944 return (1); 945 } 946 947 static int 948 ssl_cipher_process_rulestr(const char *rule_str, CIPHER_ORDER **head_p, 949 CIPHER_ORDER **tail_p, const SSL_CIPHER **ca_list, SSL_CERT *cert, 950 int *tls13_seen) 951 { 952 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl; 953 unsigned long algo_strength; 954 int j, multi, found, rule, retval, ok, buflen; 955 unsigned long cipher_id = 0; 956 const char *l, *buf; 957 char ch; 958 959 *tls13_seen = 0; 960 961 retval = 1; 962 l = rule_str; 963 for (;;) { 964 ch = *l; 965 966 if (ch == '\0') 967 break; 968 969 if (ch == '-') { 970 rule = CIPHER_DEL; 971 l++; 972 } else if (ch == '+') { 973 rule = CIPHER_ORD; 974 l++; 975 } else if (ch == '!') { 976 rule = CIPHER_KILL; 977 l++; 978 } else if (ch == '@') { 979 rule = CIPHER_SPECIAL; 980 l++; 981 } else { 982 rule = CIPHER_ADD; 983 } 984 985 if (ITEM_SEP(ch)) { 986 l++; 987 continue; 988 } 989 990 alg_mkey = 0; 991 alg_auth = 0; 992 alg_enc = 0; 993 alg_mac = 0; 994 alg_ssl = 0; 995 algo_strength = 0; 996 997 for (;;) { 998 ch = *l; 999 buf = l; 1000 buflen = 0; 1001 while (((ch >= 'A') && (ch <= 'Z')) || 1002 ((ch >= '0') && (ch <= '9')) || 1003 ((ch >= 'a') && (ch <= 'z')) || 1004 (ch == '-') || (ch == '.') || 1005 (ch == '_') || (ch == '=')) { 1006 ch = *(++l); 1007 buflen++; 1008 } 1009 1010 if (buflen == 0) { 1011 /* 1012 * We hit something we cannot deal with, 1013 * it is no command or separator nor 1014 * alphanumeric, so we call this an error. 1015 */ 1016 SSLerrorx(SSL_R_INVALID_COMMAND); 1017 return 0; 1018 } 1019 1020 if (rule == CIPHER_SPECIAL) { 1021 /* unused -- avoid compiler warning */ 1022 found = 0; 1023 /* special treatment */ 1024 break; 1025 } 1026 1027 /* check for multi-part specification */ 1028 if (ch == '+') { 1029 multi = 1; 1030 l++; 1031 } else 1032 multi = 0; 1033 1034 /* 1035 * Now search for the cipher alias in the ca_list. 1036 * Be careful with the strncmp, because the "buflen" 1037 * limitation will make the rule "ADH:SOME" and the 1038 * cipher "ADH-MY-CIPHER" look like a match for 1039 * buflen=3. So additionally check whether the cipher 1040 * name found has the correct length. We can save a 1041 * strlen() call: just checking for the '\0' at the 1042 * right place is sufficient, we have to strncmp() 1043 * anyway (we cannot use strcmp(), because buf is not 1044 * '\0' terminated.) 1045 */ 1046 j = found = 0; 1047 cipher_id = 0; 1048 while (ca_list[j]) { 1049 if (!strncmp(buf, ca_list[j]->name, buflen) && 1050 (ca_list[j]->name[buflen] == '\0')) { 1051 found = 1; 1052 break; 1053 } else 1054 j++; 1055 } 1056 1057 if (!found) 1058 break; /* ignore this entry */ 1059 1060 if (ca_list[j]->algorithm_mkey) { 1061 if (alg_mkey) { 1062 alg_mkey &= ca_list[j]->algorithm_mkey; 1063 if (!alg_mkey) { 1064 found = 0; 1065 break; 1066 } 1067 } else 1068 alg_mkey = ca_list[j]->algorithm_mkey; 1069 } 1070 1071 if (ca_list[j]->algorithm_auth) { 1072 if (alg_auth) { 1073 alg_auth &= ca_list[j]->algorithm_auth; 1074 if (!alg_auth) { 1075 found = 0; 1076 break; 1077 } 1078 } else 1079 alg_auth = ca_list[j]->algorithm_auth; 1080 } 1081 1082 if (ca_list[j]->algorithm_enc) { 1083 if (alg_enc) { 1084 alg_enc &= ca_list[j]->algorithm_enc; 1085 if (!alg_enc) { 1086 found = 0; 1087 break; 1088 } 1089 } else 1090 alg_enc = ca_list[j]->algorithm_enc; 1091 } 1092 1093 if (ca_list[j]->algorithm_mac) { 1094 if (alg_mac) { 1095 alg_mac &= ca_list[j]->algorithm_mac; 1096 if (!alg_mac) { 1097 found = 0; 1098 break; 1099 } 1100 } else 1101 alg_mac = ca_list[j]->algorithm_mac; 1102 } 1103 1104 if (ca_list[j]->algo_strength & SSL_STRONG_MASK) { 1105 if (algo_strength & SSL_STRONG_MASK) { 1106 algo_strength &= 1107 (ca_list[j]->algo_strength & 1108 SSL_STRONG_MASK) | ~SSL_STRONG_MASK; 1109 if (!(algo_strength & 1110 SSL_STRONG_MASK)) { 1111 found = 0; 1112 break; 1113 } 1114 } else 1115 algo_strength |= 1116 ca_list[j]->algo_strength & 1117 SSL_STRONG_MASK; 1118 } 1119 1120 if (ca_list[j]->valid) { 1121 /* 1122 * explicit ciphersuite found; its protocol 1123 * version does not become part of the search 1124 * pattern! 1125 */ 1126 cipher_id = ca_list[j]->id; 1127 if (ca_list[j]->algorithm_ssl == SSL_TLSV1_3) 1128 *tls13_seen = 1; 1129 } else { 1130 /* 1131 * not an explicit ciphersuite; only in this 1132 * case, the protocol version is considered 1133 * part of the search pattern 1134 */ 1135 if (ca_list[j]->algorithm_ssl) { 1136 if (alg_ssl) { 1137 alg_ssl &= 1138 ca_list[j]->algorithm_ssl; 1139 if (!alg_ssl) { 1140 found = 0; 1141 break; 1142 } 1143 } else 1144 alg_ssl = 1145 ca_list[j]->algorithm_ssl; 1146 } 1147 } 1148 1149 if (!multi) 1150 break; 1151 } 1152 1153 /* 1154 * Ok, we have the rule, now apply it 1155 */ 1156 if (rule == CIPHER_SPECIAL) { 1157 /* special command */ 1158 ok = 0; 1159 if (buflen == 8 && strncmp(buf, "STRENGTH", 8) == 0) { 1160 ok = ssl_cipher_strength_sort(head_p, tail_p); 1161 } else if (buflen == 10 && 1162 strncmp(buf, "SECLEVEL=", 9) == 0) { 1163 int level = buf[9] - '0'; 1164 1165 if (level >= 0 && level <= 5) { 1166 cert->security_level = level; 1167 ok = 1; 1168 } else { 1169 SSLerrorx(SSL_R_INVALID_COMMAND); 1170 } 1171 } else { 1172 SSLerrorx(SSL_R_INVALID_COMMAND); 1173 } 1174 if (ok == 0) 1175 retval = 0; 1176 1177 while ((*l != '\0') && !ITEM_SEP(*l)) 1178 l++; 1179 } else if (found) { 1180 if (alg_ssl == SSL_TLSV1_3) 1181 *tls13_seen = 1; 1182 ssl_cipher_apply_rule(cipher_id, alg_mkey, alg_auth, 1183 alg_enc, alg_mac, alg_ssl, algo_strength, rule, 1184 -1, head_p, tail_p); 1185 } else { 1186 while ((*l != '\0') && !ITEM_SEP(*l)) 1187 l++; 1188 } 1189 if (*l == '\0') 1190 break; /* done */ 1191 } 1192 1193 return (retval); 1194 } 1195 1196 static inline int 1197 ssl_aes_is_accelerated(void) 1198 { 1199 #if defined(__i386__) || defined(__x86_64__) 1200 return ((OPENSSL_cpu_caps() & (1ULL << 57)) != 0); 1201 #else 1202 return (0); 1203 #endif 1204 } 1205 1206 STACK_OF(SSL_CIPHER) * 1207 ssl_create_cipher_list(const SSL_METHOD *ssl_method, 1208 STACK_OF(SSL_CIPHER) **cipher_list, 1209 STACK_OF(SSL_CIPHER) *cipher_list_tls13, 1210 const char *rule_str, SSL_CERT *cert) 1211 { 1212 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases; 1213 unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl; 1214 STACK_OF(SSL_CIPHER) *cipherstack = NULL, *ret = NULL; 1215 const char *rule_p; 1216 CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr; 1217 const SSL_CIPHER **ca_list = NULL; 1218 const SSL_CIPHER *cipher; 1219 int tls13_seen = 0; 1220 int any_active; 1221 int i; 1222 1223 /* 1224 * Return with error if nothing to do. 1225 */ 1226 if (rule_str == NULL || cipher_list == NULL) 1227 goto err; 1228 1229 /* 1230 * To reduce the work to do we only want to process the compiled 1231 * in algorithms, so we first get the mask of disabled ciphers. 1232 */ 1233 ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl); 1234 1235 /* 1236 * Now we have to collect the available ciphers from the compiled 1237 * in ciphers. We cannot get more than the number compiled in, so 1238 * it is used for allocation. 1239 */ 1240 num_of_ciphers = ssl3_num_ciphers(); 1241 co_list = reallocarray(NULL, num_of_ciphers, sizeof(CIPHER_ORDER)); 1242 if (co_list == NULL) { 1243 SSLerrorx(ERR_R_MALLOC_FAILURE); 1244 goto err; 1245 } 1246 1247 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, 1248 disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl, 1249 co_list, &head, &tail); 1250 1251 1252 /* Now arrange all ciphers by preference: */ 1253 1254 /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */ 1255 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1256 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail); 1257 1258 if (ssl_aes_is_accelerated()) { 1259 /* 1260 * We have hardware assisted AES - prefer AES as a symmetric 1261 * cipher, with CHACHA20 second. 1262 */ 1263 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, 1264 CIPHER_ADD, -1, &head, &tail); 1265 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305, 1266 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1267 } else { 1268 /* 1269 * CHACHA20 is fast and safe on all hardware and is thus our 1270 * preferred symmetric cipher, with AES second. 1271 */ 1272 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305, 1273 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1274 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, 1275 CIPHER_ADD, -1, &head, &tail); 1276 } 1277 1278 /* Temporarily enable everything else for sorting */ 1279 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1280 1281 /* Low priority for MD5 */ 1282 ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail); 1283 1284 /* Move anonymous ciphers to the end. Usually, these will remain disabled. 1285 * (For applications that allow them, they aren't too bad, but we prefer 1286 * authenticated ciphers.) */ 1287 ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1288 1289 /* Move ciphers without forward secrecy to the end */ 1290 ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1291 1292 /* RC4 is sort of broken - move it to the end */ 1293 ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1294 1295 /* Now sort by symmetric encryption strength. The above ordering remains 1296 * in force within each class */ 1297 if (!ssl_cipher_strength_sort(&head, &tail)) 1298 goto err; 1299 1300 /* Now disable everything (maintaining the ordering!) */ 1301 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail); 1302 1303 /* TLSv1.3 first. */ 1304 ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_ADD, -1, &head, &tail); 1305 ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_DEL, -1, &head, &tail); 1306 1307 /* 1308 * We also need cipher aliases for selecting based on the rule_str. 1309 * There might be two types of entries in the rule_str: 1) names 1310 * of ciphers themselves 2) aliases for groups of ciphers. 1311 * For 1) we need the available ciphers and for 2) the cipher 1312 * groups of cipher_aliases added together in one list (otherwise 1313 * we would be happy with just the cipher_aliases table). 1314 */ 1315 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER); 1316 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1; 1317 ca_list = reallocarray(NULL, num_of_alias_max, sizeof(SSL_CIPHER *)); 1318 if (ca_list == NULL) { 1319 SSLerrorx(ERR_R_MALLOC_FAILURE); 1320 goto err; 1321 } 1322 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mkey, 1323 disabled_auth, disabled_enc, disabled_mac, disabled_ssl, head); 1324 1325 /* 1326 * If the rule_string begins with DEFAULT, apply the default rule 1327 * before using the (possibly available) additional rules. 1328 */ 1329 ok = 1; 1330 rule_p = rule_str; 1331 if (strncmp(rule_str, "DEFAULT", 7) == 0) { 1332 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST, 1333 &head, &tail, ca_list, cert, &tls13_seen); 1334 rule_p += 7; 1335 if (*rule_p == ':') 1336 rule_p++; 1337 } 1338 1339 if (ok && (strlen(rule_p) > 0)) 1340 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list, 1341 cert, &tls13_seen); 1342 1343 if (!ok) { 1344 /* Rule processing failure */ 1345 goto err; 1346 } 1347 1348 /* 1349 * Allocate new "cipherstack" for the result, return with error 1350 * if we cannot get one. 1351 */ 1352 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) { 1353 SSLerrorx(ERR_R_MALLOC_FAILURE); 1354 goto err; 1355 } 1356 1357 /* Prefer TLSv1.3 cipher suites. */ 1358 if (cipher_list_tls13 != NULL) { 1359 for (i = 0; i < sk_SSL_CIPHER_num(cipher_list_tls13); i++) { 1360 cipher = sk_SSL_CIPHER_value(cipher_list_tls13, i); 1361 if (!sk_SSL_CIPHER_push(cipherstack, cipher)) { 1362 SSLerrorx(ERR_R_MALLOC_FAILURE); 1363 goto err; 1364 } 1365 } 1366 tls13_seen = 1; 1367 } 1368 1369 /* 1370 * The cipher selection for the list is done. The ciphers are added 1371 * to the resulting precedence to the STACK_OF(SSL_CIPHER). 1372 * 1373 * If the rule string did not contain any references to TLSv1.3 and 1374 * TLSv1.3 cipher suites have not been configured separately, 1375 * include inactive TLSv1.3 cipher suites. This avoids attempts to 1376 * use TLSv1.3 with an older rule string that does not include 1377 * TLSv1.3 cipher suites. If the rule string resulted in no active 1378 * cipher suites then we return an empty stack. 1379 */ 1380 any_active = 0; 1381 for (curr = head; curr != NULL; curr = curr->next) { 1382 if (curr->active || 1383 (!tls13_seen && curr->cipher->algorithm_ssl == SSL_TLSV1_3)) { 1384 if (!sk_SSL_CIPHER_push(cipherstack, curr->cipher)) { 1385 SSLerrorx(ERR_R_MALLOC_FAILURE); 1386 goto err; 1387 } 1388 } 1389 any_active |= curr->active; 1390 } 1391 if (!any_active) 1392 sk_SSL_CIPHER_zero(cipherstack); 1393 1394 sk_SSL_CIPHER_free(*cipher_list); 1395 *cipher_list = cipherstack; 1396 cipherstack = NULL; 1397 1398 ret = *cipher_list; 1399 1400 err: 1401 sk_SSL_CIPHER_free(cipherstack); 1402 free((void *)ca_list); 1403 free(co_list); 1404 1405 return ret; 1406 } 1407 1408 const SSL_CIPHER * 1409 SSL_CIPHER_get_by_id(unsigned int id) 1410 { 1411 return ssl3_get_cipher_by_id(id); 1412 } 1413 LSSL_ALIAS(SSL_CIPHER_get_by_id); 1414 1415 const SSL_CIPHER * 1416 SSL_CIPHER_get_by_value(uint16_t value) 1417 { 1418 return ssl3_get_cipher_by_value(value); 1419 } 1420 LSSL_ALIAS(SSL_CIPHER_get_by_value); 1421 1422 char * 1423 SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len) 1424 { 1425 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, alg2; 1426 const char *ver, *kx, *au, *enc, *mac; 1427 char *ret; 1428 int l; 1429 1430 alg_mkey = cipher->algorithm_mkey; 1431 alg_auth = cipher->algorithm_auth; 1432 alg_enc = cipher->algorithm_enc; 1433 alg_mac = cipher->algorithm_mac; 1434 alg_ssl = cipher->algorithm_ssl; 1435 1436 alg2 = cipher->algorithm2; 1437 1438 if (alg_ssl & SSL_SSLV3) 1439 ver = "SSLv3"; 1440 else if (alg_ssl & SSL_TLSV1_2) 1441 ver = "TLSv1.2"; 1442 else if (alg_ssl & SSL_TLSV1_3) 1443 ver = "TLSv1.3"; 1444 else 1445 ver = "unknown"; 1446 1447 switch (alg_mkey) { 1448 case SSL_kRSA: 1449 kx = "RSA"; 1450 break; 1451 case SSL_kDHE: 1452 kx = "DH"; 1453 break; 1454 case SSL_kECDHE: 1455 kx = "ECDH"; 1456 break; 1457 case SSL_kGOST: 1458 kx = "GOST"; 1459 break; 1460 case SSL_kTLS1_3: 1461 kx = "TLSv1.3"; 1462 break; 1463 default: 1464 kx = "unknown"; 1465 } 1466 1467 switch (alg_auth) { 1468 case SSL_aRSA: 1469 au = "RSA"; 1470 break; 1471 case SSL_aDSS: 1472 au = "DSS"; 1473 break; 1474 case SSL_aNULL: 1475 au = "None"; 1476 break; 1477 case SSL_aECDSA: 1478 au = "ECDSA"; 1479 break; 1480 case SSL_aGOST01: 1481 au = "GOST01"; 1482 break; 1483 case SSL_aTLS1_3: 1484 au = "TLSv1.3"; 1485 break; 1486 default: 1487 au = "unknown"; 1488 break; 1489 } 1490 1491 switch (alg_enc) { 1492 case SSL_3DES: 1493 enc = "3DES(168)"; 1494 break; 1495 case SSL_RC4: 1496 enc = alg2 & SSL2_CF_8_BYTE_ENC ? "RC4(64)" : "RC4(128)"; 1497 break; 1498 case SSL_eNULL: 1499 enc = "None"; 1500 break; 1501 case SSL_AES128: 1502 enc = "AES(128)"; 1503 break; 1504 case SSL_AES256: 1505 enc = "AES(256)"; 1506 break; 1507 case SSL_AES128GCM: 1508 enc = "AESGCM(128)"; 1509 break; 1510 case SSL_AES256GCM: 1511 enc = "AESGCM(256)"; 1512 break; 1513 case SSL_CAMELLIA128: 1514 enc = "Camellia(128)"; 1515 break; 1516 case SSL_CAMELLIA256: 1517 enc = "Camellia(256)"; 1518 break; 1519 case SSL_CHACHA20POLY1305: 1520 enc = "ChaCha20-Poly1305"; 1521 break; 1522 case SSL_eGOST2814789CNT: 1523 enc = "GOST-28178-89-CNT"; 1524 break; 1525 default: 1526 enc = "unknown"; 1527 break; 1528 } 1529 1530 switch (alg_mac) { 1531 case SSL_MD5: 1532 mac = "MD5"; 1533 break; 1534 case SSL_SHA1: 1535 mac = "SHA1"; 1536 break; 1537 case SSL_SHA256: 1538 mac = "SHA256"; 1539 break; 1540 case SSL_SHA384: 1541 mac = "SHA384"; 1542 break; 1543 case SSL_AEAD: 1544 mac = "AEAD"; 1545 break; 1546 case SSL_GOST94: 1547 mac = "GOST94"; 1548 break; 1549 case SSL_GOST89MAC: 1550 mac = "GOST89IMIT"; 1551 break; 1552 case SSL_STREEBOG256: 1553 mac = "STREEBOG256"; 1554 break; 1555 default: 1556 mac = "unknown"; 1557 break; 1558 } 1559 1560 if (asprintf(&ret, "%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s\n", 1561 cipher->name, ver, kx, au, enc, mac) == -1) 1562 return "OPENSSL_malloc Error"; 1563 1564 if (buf != NULL) { 1565 l = strlcpy(buf, ret, len); 1566 free(ret); 1567 ret = buf; 1568 if (l >= len) 1569 ret = "Buffer too small"; 1570 } 1571 1572 return (ret); 1573 } 1574 LSSL_ALIAS(SSL_CIPHER_description); 1575 1576 const char * 1577 SSL_CIPHER_get_version(const SSL_CIPHER *c) 1578 { 1579 if (c == NULL) 1580 return("(NONE)"); 1581 if ((c->id >> 24) == 3) 1582 return("TLSv1/SSLv3"); 1583 else 1584 return("unknown"); 1585 } 1586 LSSL_ALIAS(SSL_CIPHER_get_version); 1587 1588 /* return the actual cipher being used */ 1589 const char * 1590 SSL_CIPHER_get_name(const SSL_CIPHER *c) 1591 { 1592 if (c != NULL) 1593 return (c->name); 1594 return("(NONE)"); 1595 } 1596 LSSL_ALIAS(SSL_CIPHER_get_name); 1597 1598 /* number of bits for symmetric cipher */ 1599 int 1600 SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits) 1601 { 1602 int ret = 0; 1603 1604 if (c != NULL) { 1605 if (alg_bits != NULL) 1606 *alg_bits = c->alg_bits; 1607 ret = c->strength_bits; 1608 } 1609 return (ret); 1610 } 1611 LSSL_ALIAS(SSL_CIPHER_get_bits); 1612 1613 unsigned long 1614 SSL_CIPHER_get_id(const SSL_CIPHER *c) 1615 { 1616 return c->id; 1617 } 1618 LSSL_ALIAS(SSL_CIPHER_get_id); 1619 1620 uint16_t 1621 SSL_CIPHER_get_value(const SSL_CIPHER *c) 1622 { 1623 return ssl3_cipher_get_value(c); 1624 } 1625 LSSL_ALIAS(SSL_CIPHER_get_value); 1626 1627 const SSL_CIPHER * 1628 SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr) 1629 { 1630 uint16_t cipher_value; 1631 CBS cbs; 1632 1633 /* This API is documented with ptr being an array of length two. */ 1634 CBS_init(&cbs, ptr, 2); 1635 if (!CBS_get_u16(&cbs, &cipher_value)) 1636 return NULL; 1637 1638 return ssl3_get_cipher_by_value(cipher_value); 1639 } 1640 LSSL_ALIAS(SSL_CIPHER_find); 1641 1642 int 1643 SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c) 1644 { 1645 switch (c->algorithm_enc) { 1646 case SSL_eNULL: 1647 return NID_undef; 1648 case SSL_3DES: 1649 return NID_des_ede3_cbc; 1650 case SSL_AES128: 1651 return NID_aes_128_cbc; 1652 case SSL_AES128GCM: 1653 return NID_aes_128_gcm; 1654 case SSL_AES256: 1655 return NID_aes_256_cbc; 1656 case SSL_AES256GCM: 1657 return NID_aes_256_gcm; 1658 case SSL_CAMELLIA128: 1659 return NID_camellia_128_cbc; 1660 case SSL_CAMELLIA256: 1661 return NID_camellia_256_cbc; 1662 case SSL_CHACHA20POLY1305: 1663 return NID_chacha20_poly1305; 1664 case SSL_DES: 1665 return NID_des_cbc; 1666 case SSL_RC4: 1667 return NID_rc4; 1668 case SSL_eGOST2814789CNT: 1669 return NID_gost89_cnt; 1670 default: 1671 return NID_undef; 1672 } 1673 } 1674 LSSL_ALIAS(SSL_CIPHER_get_cipher_nid); 1675 1676 int 1677 SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c) 1678 { 1679 switch (c->algorithm_mac) { 1680 case SSL_AEAD: 1681 return NID_undef; 1682 case SSL_GOST89MAC: 1683 return NID_id_Gost28147_89_MAC; 1684 case SSL_GOST94: 1685 return NID_id_GostR3411_94; 1686 case SSL_MD5: 1687 return NID_md5; 1688 case SSL_SHA1: 1689 return NID_sha1; 1690 case SSL_SHA256: 1691 return NID_sha256; 1692 case SSL_SHA384: 1693 return NID_sha384; 1694 case SSL_STREEBOG256: 1695 return NID_id_tc26_gost3411_2012_256; 1696 default: 1697 return NID_undef; 1698 } 1699 } 1700 LSSL_ALIAS(SSL_CIPHER_get_digest_nid); 1701 1702 int 1703 SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c) 1704 { 1705 switch (c->algorithm_mkey) { 1706 case SSL_kDHE: 1707 return NID_kx_dhe; 1708 case SSL_kECDHE: 1709 return NID_kx_ecdhe; 1710 case SSL_kGOST: 1711 return NID_kx_gost; 1712 case SSL_kRSA: 1713 return NID_kx_rsa; 1714 default: 1715 return NID_undef; 1716 } 1717 } 1718 LSSL_ALIAS(SSL_CIPHER_get_kx_nid); 1719 1720 int 1721 SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c) 1722 { 1723 switch (c->algorithm_auth) { 1724 case SSL_aNULL: 1725 return NID_auth_null; 1726 case SSL_aECDSA: 1727 return NID_auth_ecdsa; 1728 case SSL_aGOST01: 1729 return NID_auth_gost01; 1730 case SSL_aRSA: 1731 return NID_auth_rsa; 1732 default: 1733 return NID_undef; 1734 } 1735 } 1736 LSSL_ALIAS(SSL_CIPHER_get_auth_nid); 1737 1738 int 1739 SSL_CIPHER_is_aead(const SSL_CIPHER *c) 1740 { 1741 return (c->algorithm_mac & SSL_AEAD) == SSL_AEAD; 1742 } 1743 LSSL_ALIAS(SSL_CIPHER_is_aead); 1744 1745 void * 1746 SSL_COMP_get_compression_methods(void) 1747 { 1748 return NULL; 1749 } 1750 LSSL_ALIAS(SSL_COMP_get_compression_methods); 1751 1752 int 1753 SSL_COMP_add_compression_method(int id, void *cm) 1754 { 1755 return 1; 1756 } 1757 LSSL_ALIAS(SSL_COMP_add_compression_method); 1758 1759 const char * 1760 SSL_COMP_get_name(const void *comp) 1761 { 1762 return NULL; 1763 } 1764 LSSL_ALIAS(SSL_COMP_get_name); 1765