1 /* $OpenBSD: ssl_ciph.c,v 1.119 2020/09/13 16:49:05 jsing Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * ECC cipher suite support in OpenSSL originally developed by 114 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. 115 */ 116 /* ==================================================================== 117 * Copyright 2005 Nokia. All rights reserved. 118 * 119 * The portions of the attached software ("Contribution") is developed by 120 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 121 * license. 122 * 123 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 124 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 125 * support (see RFC 4279) to OpenSSL. 126 * 127 * No patent licenses or other rights except those expressly stated in 128 * the OpenSSL open source license shall be deemed granted or received 129 * expressly, by implication, estoppel, or otherwise. 130 * 131 * No assurances are provided by Nokia that the Contribution does not 132 * infringe the patent or other intellectual property rights of any third 133 * party or that the license provides you with all the necessary rights 134 * to make use of the Contribution. 135 * 136 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 137 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 138 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 139 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 140 * OTHERWISE. 141 */ 142 143 #include <stdio.h> 144 145 #include <openssl/objects.h> 146 147 #ifndef OPENSSL_NO_ENGINE 148 #include <openssl/engine.h> 149 #endif 150 151 #include "ssl_locl.h" 152 153 #define CIPHER_ADD 1 154 #define CIPHER_KILL 2 155 #define CIPHER_DEL 3 156 #define CIPHER_ORD 4 157 #define CIPHER_SPECIAL 5 158 159 typedef struct cipher_order_st { 160 const SSL_CIPHER *cipher; 161 int active; 162 int dead; 163 struct cipher_order_st *next, *prev; 164 } CIPHER_ORDER; 165 166 static const SSL_CIPHER cipher_aliases[] = { 167 168 /* "ALL" doesn't include eNULL (must be specifically enabled) */ 169 { 170 .name = SSL_TXT_ALL, 171 .algorithm_enc = ~SSL_eNULL, 172 }, 173 174 /* "COMPLEMENTOFALL" */ 175 { 176 .name = SSL_TXT_CMPALL, 177 .algorithm_enc = SSL_eNULL, 178 }, 179 180 /* 181 * "COMPLEMENTOFDEFAULT" 182 * (does *not* include ciphersuites not found in ALL!) 183 */ 184 { 185 .name = SSL_TXT_CMPDEF, 186 .algorithm_mkey = SSL_kDHE|SSL_kECDHE, 187 .algorithm_auth = SSL_aNULL, 188 .algorithm_enc = ~SSL_eNULL, 189 }, 190 191 /* 192 * key exchange aliases 193 * (some of those using only a single bit here combine multiple key 194 * exchange algs according to the RFCs, e.g. kEDH combines DHE_DSS 195 * and DHE_RSA) 196 */ 197 { 198 .name = SSL_TXT_kRSA, 199 .algorithm_mkey = SSL_kRSA, 200 }, 201 { 202 .name = SSL_TXT_kEDH, 203 .algorithm_mkey = SSL_kDHE, 204 }, 205 { 206 .name = SSL_TXT_DH, 207 .algorithm_mkey = SSL_kDHE, 208 }, 209 { 210 .name = SSL_TXT_kEECDH, 211 .algorithm_mkey = SSL_kECDHE, 212 }, 213 { 214 .name = SSL_TXT_ECDH, 215 .algorithm_mkey = SSL_kECDHE, 216 }, 217 { 218 .name = SSL_TXT_kGOST, 219 .algorithm_mkey = SSL_kGOST, 220 }, 221 222 /* server authentication aliases */ 223 { 224 .name = SSL_TXT_aRSA, 225 .algorithm_auth = SSL_aRSA, 226 }, 227 { 228 .name = SSL_TXT_aDSS, 229 .algorithm_auth = SSL_aDSS, 230 }, 231 { 232 .name = SSL_TXT_DSS, 233 .algorithm_auth = SSL_aDSS, 234 }, 235 { 236 .name = SSL_TXT_aNULL, 237 .algorithm_auth = SSL_aNULL, 238 }, 239 { 240 .name = SSL_TXT_aECDSA, 241 .algorithm_auth = SSL_aECDSA, 242 }, 243 { 244 .name = SSL_TXT_ECDSA, 245 .algorithm_auth = SSL_aECDSA, 246 }, 247 { 248 .name = SSL_TXT_aGOST01, 249 .algorithm_auth = SSL_aGOST01, 250 }, 251 { 252 .name = SSL_TXT_aGOST, 253 .algorithm_auth = SSL_aGOST01, 254 }, 255 256 /* aliases combining key exchange and server authentication */ 257 { 258 .name = SSL_TXT_DHE, 259 .algorithm_mkey = SSL_kDHE, 260 .algorithm_auth = ~SSL_aNULL, 261 }, 262 { 263 .name = SSL_TXT_EDH, 264 .algorithm_mkey = SSL_kDHE, 265 .algorithm_auth = ~SSL_aNULL, 266 }, 267 { 268 .name = SSL_TXT_ECDHE, 269 .algorithm_mkey = SSL_kECDHE, 270 .algorithm_auth = ~SSL_aNULL, 271 }, 272 { 273 .name = SSL_TXT_EECDH, 274 .algorithm_mkey = SSL_kECDHE, 275 .algorithm_auth = ~SSL_aNULL, 276 }, 277 { 278 .name = SSL_TXT_NULL, 279 .algorithm_enc = SSL_eNULL, 280 }, 281 { 282 .name = SSL_TXT_RSA, 283 .algorithm_mkey = SSL_kRSA, 284 .algorithm_auth = SSL_aRSA, 285 }, 286 { 287 .name = SSL_TXT_ADH, 288 .algorithm_mkey = SSL_kDHE, 289 .algorithm_auth = SSL_aNULL, 290 }, 291 { 292 .name = SSL_TXT_AECDH, 293 .algorithm_mkey = SSL_kECDHE, 294 .algorithm_auth = SSL_aNULL, 295 }, 296 297 /* symmetric encryption aliases */ 298 { 299 .name = SSL_TXT_3DES, 300 .algorithm_enc = SSL_3DES, 301 }, 302 { 303 .name = SSL_TXT_RC4, 304 .algorithm_enc = SSL_RC4, 305 }, 306 { 307 .name = SSL_TXT_eNULL, 308 .algorithm_enc = SSL_eNULL, 309 }, 310 { 311 .name = SSL_TXT_AES128, 312 .algorithm_enc = SSL_AES128|SSL_AES128GCM, 313 }, 314 { 315 .name = SSL_TXT_AES256, 316 .algorithm_enc = SSL_AES256|SSL_AES256GCM, 317 }, 318 { 319 .name = SSL_TXT_AES, 320 .algorithm_enc = SSL_AES, 321 }, 322 { 323 .name = SSL_TXT_AES_GCM, 324 .algorithm_enc = SSL_AES128GCM|SSL_AES256GCM, 325 }, 326 { 327 .name = SSL_TXT_CAMELLIA128, 328 .algorithm_enc = SSL_CAMELLIA128, 329 }, 330 { 331 .name = SSL_TXT_CAMELLIA256, 332 .algorithm_enc = SSL_CAMELLIA256, 333 }, 334 { 335 .name = SSL_TXT_CAMELLIA, 336 .algorithm_enc = SSL_CAMELLIA128|SSL_CAMELLIA256, 337 }, 338 { 339 .name = SSL_TXT_CHACHA20, 340 .algorithm_enc = SSL_CHACHA20POLY1305, 341 }, 342 343 /* MAC aliases */ 344 { 345 .name = SSL_TXT_AEAD, 346 .algorithm_mac = SSL_AEAD, 347 }, 348 { 349 .name = SSL_TXT_MD5, 350 .algorithm_mac = SSL_MD5, 351 }, 352 { 353 .name = SSL_TXT_SHA1, 354 .algorithm_mac = SSL_SHA1, 355 }, 356 { 357 .name = SSL_TXT_SHA, 358 .algorithm_mac = SSL_SHA1, 359 }, 360 { 361 .name = SSL_TXT_GOST94, 362 .algorithm_mac = SSL_GOST94, 363 }, 364 { 365 .name = SSL_TXT_GOST89MAC, 366 .algorithm_mac = SSL_GOST89MAC, 367 }, 368 { 369 .name = SSL_TXT_SHA256, 370 .algorithm_mac = SSL_SHA256, 371 }, 372 { 373 .name = SSL_TXT_SHA384, 374 .algorithm_mac = SSL_SHA384, 375 }, 376 { 377 .name = SSL_TXT_STREEBOG256, 378 .algorithm_mac = SSL_STREEBOG256, 379 }, 380 381 /* protocol version aliases */ 382 { 383 .name = SSL_TXT_SSLV3, 384 .algorithm_ssl = SSL_SSLV3, 385 }, 386 { 387 .name = SSL_TXT_TLSV1, 388 .algorithm_ssl = SSL_TLSV1, 389 }, 390 { 391 .name = SSL_TXT_TLSV1_2, 392 .algorithm_ssl = SSL_TLSV1_2, 393 }, 394 { 395 .name = SSL_TXT_TLSV1_3, 396 .algorithm_ssl = SSL_TLSV1_3, 397 }, 398 399 /* cipher suite aliases */ 400 #ifdef LIBRESSL_HAS_TLS1_3 401 { 402 .valid = 1, 403 .name = "TLS_AES_128_GCM_SHA256", 404 .id = TLS1_3_CK_AES_128_GCM_SHA256, 405 .algorithm_ssl = SSL_TLSV1_3, 406 }, 407 { 408 .valid = 1, 409 .name = "TLS_AES_256_GCM_SHA384", 410 .id = TLS1_3_CK_AES_256_GCM_SHA384, 411 .algorithm_ssl = SSL_TLSV1_3, 412 }, 413 { 414 .valid = 1, 415 .name = "TLS_CHACHA20_POLY1305_SHA256", 416 .id = TLS1_3_CK_CHACHA20_POLY1305_SHA256, 417 .algorithm_ssl = SSL_TLSV1_3, 418 }, 419 #endif 420 421 /* strength classes */ 422 { 423 .name = SSL_TXT_LOW, 424 .algo_strength = SSL_LOW, 425 }, 426 { 427 .name = SSL_TXT_MEDIUM, 428 .algo_strength = SSL_MEDIUM, 429 }, 430 { 431 .name = SSL_TXT_HIGH, 432 .algo_strength = SSL_HIGH, 433 }, 434 }; 435 436 int 437 ssl_cipher_get_evp(const SSL_SESSION *ss, const EVP_CIPHER **enc, 438 const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size) 439 { 440 *enc = NULL; 441 *md = NULL; 442 *mac_pkey_type = NID_undef; 443 *mac_secret_size = 0; 444 445 if (ss->cipher == NULL) 446 return 0; 447 448 /* 449 * This function does not handle EVP_AEAD. 450 * See ssl_cipher_get_aead_evp instead. 451 */ 452 if (ss->cipher->algorithm_mac & SSL_AEAD) 453 return 0; 454 455 switch (ss->cipher->algorithm_enc) { 456 case SSL_3DES: 457 *enc = EVP_des_ede3_cbc(); 458 break; 459 case SSL_RC4: 460 *enc = EVP_rc4(); 461 break; 462 case SSL_eNULL: 463 *enc = EVP_enc_null(); 464 break; 465 case SSL_AES128: 466 *enc = EVP_aes_128_cbc(); 467 break; 468 case SSL_AES256: 469 *enc = EVP_aes_256_cbc(); 470 break; 471 case SSL_CAMELLIA128: 472 *enc = EVP_camellia_128_cbc(); 473 break; 474 case SSL_CAMELLIA256: 475 *enc = EVP_camellia_256_cbc(); 476 break; 477 case SSL_eGOST2814789CNT: 478 *enc = EVP_gost2814789_cnt(); 479 break; 480 } 481 482 switch (ss->cipher->algorithm_mac) { 483 case SSL_MD5: 484 *md = EVP_md5(); 485 break; 486 case SSL_SHA1: 487 *md = EVP_sha1(); 488 break; 489 case SSL_SHA256: 490 *md = EVP_sha256(); 491 break; 492 case SSL_SHA384: 493 *md = EVP_sha384(); 494 break; 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 } 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; 517 518 if (ss->cipher->algorithm_mac == SSL_GOST89MAC) { 519 *mac_pkey_type = EVP_PKEY_GOSTIMIT; 520 *mac_secret_size = 32; /* XXX */ 521 } else { 522 *mac_pkey_type = EVP_PKEY_HMAC; 523 *mac_secret_size = EVP_MD_size(*md); 524 } 525 526 return 1; 527 } 528 529 /* 530 * ssl_cipher_get_evp_aead sets aead to point to the correct EVP_AEAD object 531 * for s->cipher. It returns 1 on success and 0 on error. 532 */ 533 int 534 ssl_cipher_get_evp_aead(const SSL_SESSION *ss, const EVP_AEAD **aead) 535 { 536 *aead = NULL; 537 538 if (ss->cipher == NULL) 539 return 0; 540 if ((ss->cipher->algorithm_mac & SSL_AEAD) == 0) 541 return 0; 542 543 switch (ss->cipher->algorithm_enc) { 544 case SSL_AES128GCM: 545 *aead = EVP_aead_aes_128_gcm(); 546 return 1; 547 case SSL_AES256GCM: 548 *aead = EVP_aead_aes_256_gcm(); 549 return 1; 550 case SSL_CHACHA20POLY1305: 551 *aead = EVP_aead_chacha20_poly1305(); 552 return 1; 553 default: 554 break; 555 } 556 return 0; 557 } 558 559 int 560 ssl_get_handshake_evp_md(SSL *s, const EVP_MD **md) 561 { 562 *md = NULL; 563 564 switch (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_MASK) { 565 case SSL_HANDSHAKE_MAC_DEFAULT: 566 *md = EVP_md5_sha1(); 567 return 1; 568 case SSL_HANDSHAKE_MAC_GOST94: 569 *md = EVP_gostr341194(); 570 return 1; 571 case SSL_HANDSHAKE_MAC_SHA256: 572 *md = EVP_sha256(); 573 return 1; 574 case SSL_HANDSHAKE_MAC_SHA384: 575 *md = EVP_sha384(); 576 return 1; 577 case SSL_HANDSHAKE_MAC_STREEBOG256: 578 *md = EVP_streebog256(); 579 return 1; 580 default: 581 break; 582 } 583 584 return 0; 585 } 586 587 #define ITEM_SEP(a) \ 588 (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ',')) 589 590 static void 591 ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr, 592 CIPHER_ORDER **tail) 593 { 594 if (curr == *tail) 595 return; 596 if (curr == *head) 597 *head = curr->next; 598 if (curr->prev != NULL) 599 curr->prev->next = curr->next; 600 if (curr->next != NULL) 601 curr->next->prev = curr->prev; 602 (*tail)->next = curr; 603 curr->prev= *tail; 604 curr->next = NULL; 605 *tail = curr; 606 } 607 608 static void 609 ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr, 610 CIPHER_ORDER **tail) 611 { 612 if (curr == *head) 613 return; 614 if (curr == *tail) 615 *tail = curr->prev; 616 if (curr->next != NULL) 617 curr->next->prev = curr->prev; 618 if (curr->prev != NULL) 619 curr->prev->next = curr->next; 620 (*head)->prev = curr; 621 curr->next= *head; 622 curr->prev = NULL; 623 *head = curr; 624 } 625 626 static void 627 ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth, 628 unsigned long *enc, unsigned long *mac, unsigned long *ssl) 629 { 630 *mkey = 0; 631 *auth = 0; 632 *enc = 0; 633 *mac = 0; 634 *ssl = 0; 635 636 /* 637 * Check for the availability of GOST 34.10 public/private key 638 * algorithms. If they are not available disable the associated 639 * authentication and key exchange algorithms. 640 */ 641 if (EVP_PKEY_meth_find(NID_id_GostR3410_2001) == NULL) { 642 *auth |= SSL_aGOST01; 643 *mkey |= SSL_kGOST; 644 } 645 646 #ifdef SSL_FORBID_ENULL 647 *enc |= SSL_eNULL; 648 #endif 649 } 650 651 static void 652 ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method, int num_of_ciphers, 653 unsigned long disabled_mkey, unsigned long disabled_auth, 654 unsigned long disabled_enc, unsigned long disabled_mac, 655 unsigned long disabled_ssl, CIPHER_ORDER *co_list, 656 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 657 { 658 int i, co_list_num; 659 const SSL_CIPHER *c; 660 661 /* 662 * We have num_of_ciphers descriptions compiled in, depending on the 663 * method selected (SSLv3, TLSv1, etc). These will later be sorted in 664 * a linked list with at most num entries. 665 */ 666 667 /* Get the initial list of ciphers */ 668 co_list_num = 0; /* actual count of ciphers */ 669 for (i = 0; i < num_of_ciphers; i++) { 670 c = ssl_method->get_cipher(i); 671 /* drop those that use any of that is not available */ 672 if ((c != NULL) && c->valid && 673 !(c->algorithm_mkey & disabled_mkey) && 674 !(c->algorithm_auth & disabled_auth) && 675 !(c->algorithm_enc & disabled_enc) && 676 !(c->algorithm_mac & disabled_mac) && 677 !(c->algorithm_ssl & disabled_ssl)) { 678 co_list[co_list_num].cipher = c; 679 co_list[co_list_num].next = NULL; 680 co_list[co_list_num].prev = NULL; 681 co_list[co_list_num].active = 0; 682 co_list_num++; 683 /* 684 if (!sk_push(ca_list,(char *)c)) goto err; 685 */ 686 } 687 } 688 689 /* 690 * Prepare linked list from list entries 691 */ 692 if (co_list_num > 0) { 693 co_list[0].prev = NULL; 694 695 if (co_list_num > 1) { 696 co_list[0].next = &co_list[1]; 697 698 for (i = 1; i < co_list_num - 1; i++) { 699 co_list[i].prev = &co_list[i - 1]; 700 co_list[i].next = &co_list[i + 1]; 701 } 702 703 co_list[co_list_num - 1].prev = 704 &co_list[co_list_num - 2]; 705 } 706 707 co_list[co_list_num - 1].next = NULL; 708 709 *head_p = &co_list[0]; 710 *tail_p = &co_list[co_list_num - 1]; 711 } 712 } 713 714 static void 715 ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list, int num_of_group_aliases, 716 unsigned long disabled_mkey, unsigned long disabled_auth, 717 unsigned long disabled_enc, unsigned long disabled_mac, 718 unsigned long disabled_ssl, CIPHER_ORDER *head) 719 { 720 CIPHER_ORDER *ciph_curr; 721 const SSL_CIPHER **ca_curr; 722 int i; 723 unsigned long mask_mkey = ~disabled_mkey; 724 unsigned long mask_auth = ~disabled_auth; 725 unsigned long mask_enc = ~disabled_enc; 726 unsigned long mask_mac = ~disabled_mac; 727 unsigned long mask_ssl = ~disabled_ssl; 728 729 /* 730 * First, add the real ciphers as already collected 731 */ 732 ciph_curr = head; 733 ca_curr = ca_list; 734 while (ciph_curr != NULL) { 735 *ca_curr = ciph_curr->cipher; 736 ca_curr++; 737 ciph_curr = ciph_curr->next; 738 } 739 740 /* 741 * Now we add the available ones from the cipher_aliases[] table. 742 * They represent either one or more algorithms, some of which 743 * in any affected category must be supported (set in enabled_mask), 744 * or represent a cipher strength value (will be added in any case because algorithms=0). 745 */ 746 for (i = 0; i < num_of_group_aliases; i++) { 747 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey; 748 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth; 749 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc; 750 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac; 751 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl; 752 753 if (algorithm_mkey) 754 if ((algorithm_mkey & mask_mkey) == 0) 755 continue; 756 757 if (algorithm_auth) 758 if ((algorithm_auth & mask_auth) == 0) 759 continue; 760 761 if (algorithm_enc) 762 if ((algorithm_enc & mask_enc) == 0) 763 continue; 764 765 if (algorithm_mac) 766 if ((algorithm_mac & mask_mac) == 0) 767 continue; 768 769 if (algorithm_ssl) 770 if ((algorithm_ssl & mask_ssl) == 0) 771 continue; 772 773 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i); 774 ca_curr++; 775 } 776 777 *ca_curr = NULL; /* end of list */ 778 } 779 780 static void 781 ssl_cipher_apply_rule(unsigned long cipher_id, unsigned long alg_mkey, 782 unsigned long alg_auth, unsigned long alg_enc, unsigned long alg_mac, 783 unsigned long alg_ssl, unsigned long algo_strength, int rule, 784 int strength_bits, CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 785 { 786 CIPHER_ORDER *head, *tail, *curr, *next, *last; 787 const SSL_CIPHER *cp; 788 int reverse = 0; 789 790 if (rule == CIPHER_DEL) 791 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */ 792 793 head = *head_p; 794 tail = *tail_p; 795 796 if (reverse) { 797 next = tail; 798 last = head; 799 } else { 800 next = head; 801 last = tail; 802 } 803 804 curr = NULL; 805 for (;;) { 806 if (curr == last) 807 break; 808 curr = next; 809 next = reverse ? curr->prev : curr->next; 810 811 cp = curr->cipher; 812 813 if (cipher_id && cp->id != cipher_id) 814 continue; 815 816 /* 817 * Selection criteria is either the value of strength_bits 818 * or the algorithms used. 819 */ 820 if (strength_bits >= 0) { 821 if (strength_bits != cp->strength_bits) 822 continue; 823 } else { 824 if (alg_mkey && !(alg_mkey & cp->algorithm_mkey)) 825 continue; 826 if (alg_auth && !(alg_auth & cp->algorithm_auth)) 827 continue; 828 if (alg_enc && !(alg_enc & cp->algorithm_enc)) 829 continue; 830 if (alg_mac && !(alg_mac & cp->algorithm_mac)) 831 continue; 832 if (alg_ssl && !(alg_ssl & cp->algorithm_ssl)) 833 continue; 834 if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength)) 835 continue; 836 } 837 838 /* add the cipher if it has not been added yet. */ 839 if (rule == CIPHER_ADD) { 840 /* reverse == 0 */ 841 if (!curr->active) { 842 ll_append_tail(&head, curr, &tail); 843 curr->active = 1; 844 } 845 } 846 /* Move the added cipher to this location */ 847 else if (rule == CIPHER_ORD) { 848 /* reverse == 0 */ 849 if (curr->active) { 850 ll_append_tail(&head, curr, &tail); 851 } 852 } else if (rule == CIPHER_DEL) { 853 /* reverse == 1 */ 854 if (curr->active) { 855 /* most recently deleted ciphersuites get best positions 856 * for any future CIPHER_ADD (note that the CIPHER_DEL loop 857 * works in reverse to maintain the order) */ 858 ll_append_head(&head, curr, &tail); 859 curr->active = 0; 860 } 861 } else if (rule == CIPHER_KILL) { 862 /* reverse == 0 */ 863 if (head == curr) 864 head = curr->next; 865 else 866 curr->prev->next = curr->next; 867 if (tail == curr) 868 tail = curr->prev; 869 curr->active = 0; 870 if (curr->next != NULL) 871 curr->next->prev = curr->prev; 872 if (curr->prev != NULL) 873 curr->prev->next = curr->next; 874 curr->next = NULL; 875 curr->prev = NULL; 876 } 877 } 878 879 *head_p = head; 880 *tail_p = tail; 881 } 882 883 static int 884 ssl_cipher_strength_sort(CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 885 { 886 int max_strength_bits, i, *number_uses; 887 CIPHER_ORDER *curr; 888 889 /* 890 * This routine sorts the ciphers with descending strength. The sorting 891 * must keep the pre-sorted sequence, so we apply the normal sorting 892 * routine as '+' movement to the end of the list. 893 */ 894 max_strength_bits = 0; 895 curr = *head_p; 896 while (curr != NULL) { 897 if (curr->active && 898 (curr->cipher->strength_bits > max_strength_bits)) 899 max_strength_bits = curr->cipher->strength_bits; 900 curr = curr->next; 901 } 902 903 number_uses = calloc((max_strength_bits + 1), sizeof(int)); 904 if (!number_uses) { 905 SSLerrorx(ERR_R_MALLOC_FAILURE); 906 return (0); 907 } 908 909 /* 910 * Now find the strength_bits values actually used 911 */ 912 curr = *head_p; 913 while (curr != NULL) { 914 if (curr->active) 915 number_uses[curr->cipher->strength_bits]++; 916 curr = curr->next; 917 } 918 /* 919 * Go through the list of used strength_bits values in descending 920 * order. 921 */ 922 for (i = max_strength_bits; i >= 0; i--) 923 if (number_uses[i] > 0) 924 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p); 925 926 free(number_uses); 927 return (1); 928 } 929 930 static int 931 ssl_cipher_process_rulestr(const char *rule_str, CIPHER_ORDER **head_p, 932 CIPHER_ORDER **tail_p, const SSL_CIPHER **ca_list, int *tls13_seen) 933 { 934 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl; 935 unsigned long algo_strength; 936 int j, multi, found, rule, retval, ok, buflen; 937 unsigned long cipher_id = 0; 938 const char *l, *buf; 939 char ch; 940 941 *tls13_seen = 0; 942 943 retval = 1; 944 l = rule_str; 945 for (;;) { 946 ch = *l; 947 948 if (ch == '\0') 949 break; 950 951 if (ch == '-') { 952 rule = CIPHER_DEL; 953 l++; 954 } else if (ch == '+') { 955 rule = CIPHER_ORD; 956 l++; 957 } else if (ch == '!') { 958 rule = CIPHER_KILL; 959 l++; 960 } else if (ch == '@') { 961 rule = CIPHER_SPECIAL; 962 l++; 963 } else { 964 rule = CIPHER_ADD; 965 } 966 967 if (ITEM_SEP(ch)) { 968 l++; 969 continue; 970 } 971 972 alg_mkey = 0; 973 alg_auth = 0; 974 alg_enc = 0; 975 alg_mac = 0; 976 alg_ssl = 0; 977 algo_strength = 0; 978 979 for (;;) { 980 ch = *l; 981 buf = l; 982 buflen = 0; 983 while (((ch >= 'A') && (ch <= 'Z')) || 984 ((ch >= '0') && (ch <= '9')) || 985 ((ch >= 'a') && (ch <= 'z')) || 986 (ch == '-') || (ch == '.') || 987 (ch == '_')) { 988 ch = *(++l); 989 buflen++; 990 } 991 992 if (buflen == 0) { 993 /* 994 * We hit something we cannot deal with, 995 * it is no command or separator nor 996 * alphanumeric, so we call this an error. 997 */ 998 SSLerrorx(SSL_R_INVALID_COMMAND); 999 retval = found = 0; 1000 l++; 1001 break; 1002 } 1003 1004 if (rule == CIPHER_SPECIAL) { 1005 /* unused -- avoid compiler warning */ 1006 found = 0; 1007 /* special treatment */ 1008 break; 1009 } 1010 1011 /* check for multi-part specification */ 1012 if (ch == '+') { 1013 multi = 1; 1014 l++; 1015 } else 1016 multi = 0; 1017 1018 /* 1019 * Now search for the cipher alias in the ca_list. 1020 * Be careful with the strncmp, because the "buflen" 1021 * limitation will make the rule "ADH:SOME" and the 1022 * cipher "ADH-MY-CIPHER" look like a match for 1023 * buflen=3. So additionally check whether the cipher 1024 * name found has the correct length. We can save a 1025 * strlen() call: just checking for the '\0' at the 1026 * right place is sufficient, we have to strncmp() 1027 * anyway (we cannot use strcmp(), because buf is not 1028 * '\0' terminated.) 1029 */ 1030 j = found = 0; 1031 cipher_id = 0; 1032 while (ca_list[j]) { 1033 if (!strncmp(buf, ca_list[j]->name, buflen) && 1034 (ca_list[j]->name[buflen] == '\0')) { 1035 found = 1; 1036 break; 1037 } else 1038 j++; 1039 } 1040 1041 if (!found) 1042 break; /* ignore this entry */ 1043 1044 if (ca_list[j]->algorithm_mkey) { 1045 if (alg_mkey) { 1046 alg_mkey &= ca_list[j]->algorithm_mkey; 1047 if (!alg_mkey) { 1048 found = 0; 1049 break; 1050 } 1051 } else 1052 alg_mkey = ca_list[j]->algorithm_mkey; 1053 } 1054 1055 if (ca_list[j]->algorithm_auth) { 1056 if (alg_auth) { 1057 alg_auth &= ca_list[j]->algorithm_auth; 1058 if (!alg_auth) { 1059 found = 0; 1060 break; 1061 } 1062 } else 1063 alg_auth = ca_list[j]->algorithm_auth; 1064 } 1065 1066 if (ca_list[j]->algorithm_enc) { 1067 if (alg_enc) { 1068 alg_enc &= ca_list[j]->algorithm_enc; 1069 if (!alg_enc) { 1070 found = 0; 1071 break; 1072 } 1073 } else 1074 alg_enc = ca_list[j]->algorithm_enc; 1075 } 1076 1077 if (ca_list[j]->algorithm_mac) { 1078 if (alg_mac) { 1079 alg_mac &= ca_list[j]->algorithm_mac; 1080 if (!alg_mac) { 1081 found = 0; 1082 break; 1083 } 1084 } else 1085 alg_mac = ca_list[j]->algorithm_mac; 1086 } 1087 1088 if (ca_list[j]->algo_strength & SSL_STRONG_MASK) { 1089 if (algo_strength & SSL_STRONG_MASK) { 1090 algo_strength &= 1091 (ca_list[j]->algo_strength & 1092 SSL_STRONG_MASK) | ~SSL_STRONG_MASK; 1093 if (!(algo_strength & 1094 SSL_STRONG_MASK)) { 1095 found = 0; 1096 break; 1097 } 1098 } else 1099 algo_strength |= 1100 ca_list[j]->algo_strength & 1101 SSL_STRONG_MASK; 1102 } 1103 1104 if (ca_list[j]->valid) { 1105 /* 1106 * explicit ciphersuite found; its protocol 1107 * version does not become part of the search 1108 * pattern! 1109 */ 1110 cipher_id = ca_list[j]->id; 1111 if (ca_list[j]->algorithm_ssl == SSL_TLSV1_3) 1112 *tls13_seen = 1; 1113 } else { 1114 /* 1115 * not an explicit ciphersuite; only in this 1116 * case, the protocol version is considered 1117 * part of the search pattern 1118 */ 1119 if (ca_list[j]->algorithm_ssl) { 1120 if (alg_ssl) { 1121 alg_ssl &= 1122 ca_list[j]->algorithm_ssl; 1123 if (!alg_ssl) { 1124 found = 0; 1125 break; 1126 } 1127 } else 1128 alg_ssl = 1129 ca_list[j]->algorithm_ssl; 1130 } 1131 } 1132 1133 if (!multi) 1134 break; 1135 } 1136 1137 /* 1138 * Ok, we have the rule, now apply it 1139 */ 1140 if (rule == CIPHER_SPECIAL) { 1141 /* special command */ 1142 ok = 0; 1143 if ((buflen == 8) && !strncmp(buf, "STRENGTH", 8)) 1144 ok = ssl_cipher_strength_sort(head_p, tail_p); 1145 else 1146 SSLerrorx(SSL_R_INVALID_COMMAND); 1147 if (ok == 0) 1148 retval = 0; 1149 /* 1150 * We do not support any "multi" options 1151 * together with "@", so throw away the 1152 * rest of the command, if any left, until 1153 * end or ':' is found. 1154 */ 1155 while ((*l != '\0') && !ITEM_SEP(*l)) 1156 l++; 1157 } else if (found) { 1158 if (alg_ssl == SSL_TLSV1_3) 1159 *tls13_seen = 1; 1160 ssl_cipher_apply_rule(cipher_id, alg_mkey, alg_auth, 1161 alg_enc, alg_mac, alg_ssl, algo_strength, rule, 1162 -1, head_p, tail_p); 1163 } else { 1164 while ((*l != '\0') && !ITEM_SEP(*l)) 1165 l++; 1166 } 1167 if (*l == '\0') 1168 break; /* done */ 1169 } 1170 1171 return (retval); 1172 } 1173 1174 static inline int 1175 ssl_aes_is_accelerated(void) 1176 { 1177 #if defined(__i386__) || defined(__x86_64__) 1178 return ((OPENSSL_cpu_caps() & (1ULL << 57)) != 0); 1179 #else 1180 return (0); 1181 #endif 1182 } 1183 1184 STACK_OF(SSL_CIPHER) * 1185 ssl_create_cipher_list(const SSL_METHOD *ssl_method, 1186 STACK_OF(SSL_CIPHER) **cipher_list, 1187 STACK_OF(SSL_CIPHER) *cipher_list_tls13, 1188 const char *rule_str) 1189 { 1190 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases; 1191 unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl; 1192 STACK_OF(SSL_CIPHER) *cipherstack; 1193 const char *rule_p; 1194 CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr; 1195 const SSL_CIPHER **ca_list = NULL; 1196 const SSL_CIPHER *cipher; 1197 int tls13_seen = 0; 1198 int any_active; 1199 int i; 1200 1201 /* 1202 * Return with error if nothing to do. 1203 */ 1204 if (rule_str == NULL || cipher_list == NULL) 1205 return NULL; 1206 1207 /* 1208 * To reduce the work to do we only want to process the compiled 1209 * in algorithms, so we first get the mask of disabled ciphers. 1210 */ 1211 ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl); 1212 1213 /* 1214 * Now we have to collect the available ciphers from the compiled 1215 * in ciphers. We cannot get more than the number compiled in, so 1216 * it is used for allocation. 1217 */ 1218 num_of_ciphers = ssl_method->num_ciphers(); 1219 co_list = reallocarray(NULL, num_of_ciphers, sizeof(CIPHER_ORDER)); 1220 if (co_list == NULL) { 1221 SSLerrorx(ERR_R_MALLOC_FAILURE); 1222 return(NULL); /* Failure */ 1223 } 1224 1225 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, 1226 disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl, 1227 co_list, &head, &tail); 1228 1229 1230 /* Now arrange all ciphers by preference: */ 1231 1232 /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */ 1233 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1234 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail); 1235 1236 if (ssl_aes_is_accelerated()) { 1237 /* 1238 * We have hardware assisted AES - prefer AES as a symmetric 1239 * cipher, with CHACHA20 second. 1240 */ 1241 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, 1242 CIPHER_ADD, -1, &head, &tail); 1243 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305, 1244 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1245 } else { 1246 /* 1247 * CHACHA20 is fast and safe on all hardware and is thus our 1248 * preferred symmetric cipher, with AES second. 1249 */ 1250 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305, 1251 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1252 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, 1253 CIPHER_ADD, -1, &head, &tail); 1254 } 1255 1256 /* Temporarily enable everything else for sorting */ 1257 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1258 1259 /* Low priority for MD5 */ 1260 ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail); 1261 1262 /* Move anonymous ciphers to the end. Usually, these will remain disabled. 1263 * (For applications that allow them, they aren't too bad, but we prefer 1264 * authenticated ciphers.) */ 1265 ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1266 1267 /* Move ciphers without forward secrecy to the end */ 1268 ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1269 1270 /* RC4 is sort of broken - move it to the end */ 1271 ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1272 1273 /* Now sort by symmetric encryption strength. The above ordering remains 1274 * in force within each class */ 1275 if (!ssl_cipher_strength_sort(&head, &tail)) { 1276 free(co_list); 1277 return NULL; 1278 } 1279 1280 /* Now disable everything (maintaining the ordering!) */ 1281 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail); 1282 1283 /* TLSv1.3 first. */ 1284 ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_ADD, -1, &head, &tail); 1285 ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_DEL, -1, &head, &tail); 1286 1287 /* 1288 * We also need cipher aliases for selecting based on the rule_str. 1289 * There might be two types of entries in the rule_str: 1) names 1290 * of ciphers themselves 2) aliases for groups of ciphers. 1291 * For 1) we need the available ciphers and for 2) the cipher 1292 * groups of cipher_aliases added together in one list (otherwise 1293 * we would be happy with just the cipher_aliases table). 1294 */ 1295 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER); 1296 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1; 1297 ca_list = reallocarray(NULL, num_of_alias_max, sizeof(SSL_CIPHER *)); 1298 if (ca_list == NULL) { 1299 free(co_list); 1300 SSLerrorx(ERR_R_MALLOC_FAILURE); 1301 return(NULL); /* Failure */ 1302 } 1303 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mkey, 1304 disabled_auth, disabled_enc, disabled_mac, disabled_ssl, head); 1305 1306 /* 1307 * If the rule_string begins with DEFAULT, apply the default rule 1308 * before using the (possibly available) additional rules. 1309 */ 1310 ok = 1; 1311 rule_p = rule_str; 1312 if (strncmp(rule_str, "DEFAULT", 7) == 0) { 1313 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST, 1314 &head, &tail, ca_list, &tls13_seen); 1315 rule_p += 7; 1316 if (*rule_p == ':') 1317 rule_p++; 1318 } 1319 1320 if (ok && (strlen(rule_p) > 0)) 1321 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list, 1322 &tls13_seen); 1323 1324 free((void *)ca_list); /* Not needed anymore */ 1325 1326 if (!ok) { 1327 /* Rule processing failure */ 1328 free(co_list); 1329 return (NULL); 1330 } 1331 1332 /* 1333 * Allocate new "cipherstack" for the result, return with error 1334 * if we cannot get one. 1335 */ 1336 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) { 1337 free(co_list); 1338 return (NULL); 1339 } 1340 1341 /* Prefer TLSv1.3 cipher suites. */ 1342 if (cipher_list_tls13 != NULL) { 1343 for (i = 0; i < sk_SSL_CIPHER_num(cipher_list_tls13); i++) { 1344 cipher = sk_SSL_CIPHER_value(cipher_list_tls13, i); 1345 sk_SSL_CIPHER_push(cipherstack, cipher); 1346 } 1347 tls13_seen = 1; 1348 } 1349 1350 /* 1351 * The cipher selection for the list is done. The ciphers are added 1352 * to the resulting precedence to the STACK_OF(SSL_CIPHER). 1353 * 1354 * If the rule string did not contain any references to TLSv1.3 and 1355 * TLSv1.3 cipher suites have not been configured separately, 1356 * include inactive TLSv1.3 cipher suites. This avoids attempts to 1357 * use TLSv1.3 with an older rule string that does not include 1358 * TLSv1.3 cipher suites. If the rule string resulted in no active 1359 * cipher suites then we return an empty stack. 1360 */ 1361 any_active = 0; 1362 for (curr = head; curr != NULL; curr = curr->next) { 1363 if (curr->active || 1364 (!tls13_seen && curr->cipher->algorithm_ssl == SSL_TLSV1_3)) 1365 sk_SSL_CIPHER_push(cipherstack, curr->cipher); 1366 any_active |= curr->active; 1367 } 1368 if (!any_active) 1369 sk_SSL_CIPHER_zero(cipherstack); 1370 1371 free(co_list); /* Not needed any longer */ 1372 1373 sk_SSL_CIPHER_free(*cipher_list); 1374 *cipher_list = cipherstack; 1375 1376 return (cipherstack); 1377 } 1378 1379 const SSL_CIPHER * 1380 SSL_CIPHER_get_by_id(unsigned int id) 1381 { 1382 return ssl3_get_cipher_by_id(id); 1383 } 1384 1385 const SSL_CIPHER * 1386 SSL_CIPHER_get_by_value(uint16_t value) 1387 { 1388 return ssl3_get_cipher_by_value(value); 1389 } 1390 1391 char * 1392 SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len) 1393 { 1394 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, alg2; 1395 const char *ver, *kx, *au, *enc, *mac; 1396 char *ret; 1397 int l; 1398 1399 alg_mkey = cipher->algorithm_mkey; 1400 alg_auth = cipher->algorithm_auth; 1401 alg_enc = cipher->algorithm_enc; 1402 alg_mac = cipher->algorithm_mac; 1403 alg_ssl = cipher->algorithm_ssl; 1404 1405 alg2 = cipher->algorithm2; 1406 1407 if (alg_ssl & SSL_SSLV3) 1408 ver = "SSLv3"; 1409 else if (alg_ssl & SSL_TLSV1_2) 1410 ver = "TLSv1.2"; 1411 else if (alg_ssl & SSL_TLSV1_3) 1412 ver = "TLSv1.3"; 1413 else 1414 ver = "unknown"; 1415 1416 switch (alg_mkey) { 1417 case SSL_kRSA: 1418 kx = "RSA"; 1419 break; 1420 case SSL_kDHE: 1421 kx = "DH"; 1422 break; 1423 case SSL_kECDHE: 1424 kx = "ECDH"; 1425 break; 1426 case SSL_kGOST: 1427 kx = "GOST"; 1428 break; 1429 case SSL_kTLS1_3: 1430 kx = "TLSv1.3"; 1431 break; 1432 default: 1433 kx = "unknown"; 1434 } 1435 1436 switch (alg_auth) { 1437 case SSL_aRSA: 1438 au = "RSA"; 1439 break; 1440 case SSL_aDSS: 1441 au = "DSS"; 1442 break; 1443 case SSL_aNULL: 1444 au = "None"; 1445 break; 1446 case SSL_aECDSA: 1447 au = "ECDSA"; 1448 break; 1449 case SSL_aGOST01: 1450 au = "GOST01"; 1451 break; 1452 case SSL_aTLS1_3: 1453 au = "TLSv1.3"; 1454 break; 1455 default: 1456 au = "unknown"; 1457 break; 1458 } 1459 1460 switch (alg_enc) { 1461 case SSL_3DES: 1462 enc = "3DES(168)"; 1463 break; 1464 case SSL_RC4: 1465 enc = alg2 & SSL2_CF_8_BYTE_ENC ? "RC4(64)" : "RC4(128)"; 1466 break; 1467 case SSL_eNULL: 1468 enc = "None"; 1469 break; 1470 case SSL_AES128: 1471 enc = "AES(128)"; 1472 break; 1473 case SSL_AES256: 1474 enc = "AES(256)"; 1475 break; 1476 case SSL_AES128GCM: 1477 enc = "AESGCM(128)"; 1478 break; 1479 case SSL_AES256GCM: 1480 enc = "AESGCM(256)"; 1481 break; 1482 case SSL_CAMELLIA128: 1483 enc = "Camellia(128)"; 1484 break; 1485 case SSL_CAMELLIA256: 1486 enc = "Camellia(256)"; 1487 break; 1488 case SSL_CHACHA20POLY1305: 1489 enc = "ChaCha20-Poly1305"; 1490 break; 1491 case SSL_eGOST2814789CNT: 1492 enc = "GOST-28178-89-CNT"; 1493 break; 1494 default: 1495 enc = "unknown"; 1496 break; 1497 } 1498 1499 switch (alg_mac) { 1500 case SSL_MD5: 1501 mac = "MD5"; 1502 break; 1503 case SSL_SHA1: 1504 mac = "SHA1"; 1505 break; 1506 case SSL_SHA256: 1507 mac = "SHA256"; 1508 break; 1509 case SSL_SHA384: 1510 mac = "SHA384"; 1511 break; 1512 case SSL_AEAD: 1513 mac = "AEAD"; 1514 break; 1515 case SSL_GOST94: 1516 mac = "GOST94"; 1517 break; 1518 case SSL_GOST89MAC: 1519 mac = "GOST89IMIT"; 1520 break; 1521 case SSL_STREEBOG256: 1522 mac = "STREEBOG256"; 1523 break; 1524 default: 1525 mac = "unknown"; 1526 break; 1527 } 1528 1529 if (asprintf(&ret, "%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s\n", 1530 cipher->name, ver, kx, au, enc, mac) == -1) 1531 return "OPENSSL_malloc Error"; 1532 1533 if (buf != NULL) { 1534 l = strlcpy(buf, ret, len); 1535 free(ret); 1536 ret = buf; 1537 if (l >= len) 1538 ret = "Buffer too small"; 1539 } 1540 1541 return (ret); 1542 } 1543 1544 const char * 1545 SSL_CIPHER_get_version(const SSL_CIPHER *c) 1546 { 1547 if (c == NULL) 1548 return("(NONE)"); 1549 if ((c->id >> 24) == 3) 1550 return("TLSv1/SSLv3"); 1551 else 1552 return("unknown"); 1553 } 1554 1555 /* return the actual cipher being used */ 1556 const char * 1557 SSL_CIPHER_get_name(const SSL_CIPHER *c) 1558 { 1559 if (c != NULL) 1560 return (c->name); 1561 return("(NONE)"); 1562 } 1563 1564 /* number of bits for symmetric cipher */ 1565 int 1566 SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits) 1567 { 1568 int ret = 0; 1569 1570 if (c != NULL) { 1571 if (alg_bits != NULL) 1572 *alg_bits = c->alg_bits; 1573 ret = c->strength_bits; 1574 } 1575 return (ret); 1576 } 1577 1578 unsigned long 1579 SSL_CIPHER_get_id(const SSL_CIPHER *c) 1580 { 1581 return c->id; 1582 } 1583 1584 uint16_t 1585 SSL_CIPHER_get_value(const SSL_CIPHER *c) 1586 { 1587 return ssl3_cipher_get_value(c); 1588 } 1589 1590 int 1591 SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c) 1592 { 1593 switch (c->algorithm_enc) { 1594 case SSL_eNULL: 1595 return NID_undef; 1596 case SSL_3DES: 1597 return NID_des_ede3_cbc; 1598 case SSL_AES128: 1599 return NID_aes_128_cbc; 1600 case SSL_AES128GCM: 1601 return NID_aes_128_gcm; 1602 case SSL_AES256: 1603 return NID_aes_256_cbc; 1604 case SSL_AES256GCM: 1605 return NID_aes_256_gcm; 1606 case SSL_CAMELLIA128: 1607 return NID_camellia_128_cbc; 1608 case SSL_CAMELLIA256: 1609 return NID_camellia_256_cbc; 1610 case SSL_CHACHA20POLY1305: 1611 return NID_chacha20_poly1305; 1612 case SSL_DES: 1613 return NID_des_cbc; 1614 case SSL_RC4: 1615 return NID_rc4; 1616 case SSL_eGOST2814789CNT: 1617 return NID_gost89_cnt; 1618 default: 1619 return NID_undef; 1620 } 1621 } 1622 1623 int 1624 SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c) 1625 { 1626 switch (c->algorithm_mac) { 1627 case SSL_AEAD: 1628 return NID_undef; 1629 case SSL_GOST89MAC: 1630 return NID_id_Gost28147_89_MAC; 1631 case SSL_GOST94: 1632 return NID_id_GostR3411_94; 1633 case SSL_MD5: 1634 return NID_md5; 1635 case SSL_SHA1: 1636 return NID_sha1; 1637 case SSL_SHA256: 1638 return NID_sha256; 1639 case SSL_SHA384: 1640 return NID_sha384; 1641 case SSL_STREEBOG256: 1642 return NID_id_tc26_gost3411_2012_256; 1643 default: 1644 return NID_undef; 1645 } 1646 } 1647 1648 int 1649 SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c) 1650 { 1651 switch (c->algorithm_mkey) { 1652 case SSL_kDHE: 1653 return NID_kx_dhe; 1654 case SSL_kECDHE: 1655 return NID_kx_ecdhe; 1656 case SSL_kGOST: 1657 return NID_kx_gost; 1658 case SSL_kRSA: 1659 return NID_kx_rsa; 1660 default: 1661 return NID_undef; 1662 } 1663 } 1664 1665 int 1666 SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c) 1667 { 1668 switch (c->algorithm_auth) { 1669 case SSL_aNULL: 1670 return NID_auth_null; 1671 case SSL_aECDSA: 1672 return NID_auth_ecdsa; 1673 case SSL_aGOST01: 1674 return NID_auth_gost01; 1675 case SSL_aRSA: 1676 return NID_auth_rsa; 1677 default: 1678 return NID_undef; 1679 } 1680 } 1681 1682 int 1683 SSL_CIPHER_is_aead(const SSL_CIPHER *c) 1684 { 1685 return (c->algorithm_mac & SSL_AEAD) == SSL_AEAD; 1686 } 1687 1688 void * 1689 SSL_COMP_get_compression_methods(void) 1690 { 1691 return NULL; 1692 } 1693 1694 int 1695 SSL_COMP_add_compression_method(int id, void *cm) 1696 { 1697 return 1; 1698 } 1699 1700 const char * 1701 SSL_COMP_get_name(const void *comp) 1702 { 1703 return NULL; 1704 } 1705