1 /* $OpenBSD: ssl_ciph.c,v 1.124 2021/07/03 16:06:44 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 #include <openssl/opensslconf.h> 147 148 #ifndef OPENSSL_NO_ENGINE 149 #include <openssl/engine.h> 150 #endif 151 152 #include "ssl_locl.h" 153 154 #define CIPHER_ADD 1 155 #define CIPHER_KILL 2 156 #define CIPHER_DEL 3 157 #define CIPHER_ORD 4 158 #define CIPHER_SPECIAL 5 159 160 typedef struct cipher_order_st { 161 const SSL_CIPHER *cipher; 162 int active; 163 int dead; 164 struct cipher_order_st *next, *prev; 165 } CIPHER_ORDER; 166 167 static const SSL_CIPHER cipher_aliases[] = { 168 169 /* "ALL" doesn't include eNULL (must be specifically enabled) */ 170 { 171 .name = SSL_TXT_ALL, 172 .algorithm_enc = ~SSL_eNULL, 173 }, 174 175 /* "COMPLEMENTOFALL" */ 176 { 177 .name = SSL_TXT_CMPALL, 178 .algorithm_enc = SSL_eNULL, 179 }, 180 181 /* 182 * "COMPLEMENTOFDEFAULT" 183 * (does *not* include ciphersuites not found in ALL!) 184 */ 185 { 186 .name = SSL_TXT_CMPDEF, 187 .algorithm_mkey = SSL_kDHE|SSL_kECDHE, 188 .algorithm_auth = SSL_aNULL, 189 .algorithm_enc = ~SSL_eNULL, 190 }, 191 192 /* 193 * key exchange aliases 194 * (some of those using only a single bit here combine multiple key 195 * exchange algs according to the RFCs, e.g. kEDH combines DHE_DSS 196 * and DHE_RSA) 197 */ 198 { 199 .name = SSL_TXT_kRSA, 200 .algorithm_mkey = SSL_kRSA, 201 }, 202 { 203 .name = SSL_TXT_kEDH, 204 .algorithm_mkey = SSL_kDHE, 205 }, 206 { 207 .name = SSL_TXT_DH, 208 .algorithm_mkey = SSL_kDHE, 209 }, 210 { 211 .name = SSL_TXT_kEECDH, 212 .algorithm_mkey = SSL_kECDHE, 213 }, 214 { 215 .name = SSL_TXT_ECDH, 216 .algorithm_mkey = SSL_kECDHE, 217 }, 218 { 219 .name = SSL_TXT_kGOST, 220 .algorithm_mkey = SSL_kGOST, 221 }, 222 223 /* server authentication aliases */ 224 { 225 .name = SSL_TXT_aRSA, 226 .algorithm_auth = SSL_aRSA, 227 }, 228 { 229 .name = SSL_TXT_aDSS, 230 .algorithm_auth = SSL_aDSS, 231 }, 232 { 233 .name = SSL_TXT_DSS, 234 .algorithm_auth = SSL_aDSS, 235 }, 236 { 237 .name = SSL_TXT_aNULL, 238 .algorithm_auth = SSL_aNULL, 239 }, 240 { 241 .name = SSL_TXT_aECDSA, 242 .algorithm_auth = SSL_aECDSA, 243 }, 244 { 245 .name = SSL_TXT_ECDSA, 246 .algorithm_auth = SSL_aECDSA, 247 }, 248 { 249 .name = SSL_TXT_aGOST01, 250 .algorithm_auth = SSL_aGOST01, 251 }, 252 { 253 .name = SSL_TXT_aGOST, 254 .algorithm_auth = SSL_aGOST01, 255 }, 256 257 /* aliases combining key exchange and server authentication */ 258 { 259 .name = SSL_TXT_DHE, 260 .algorithm_mkey = SSL_kDHE, 261 .algorithm_auth = ~SSL_aNULL, 262 }, 263 { 264 .name = SSL_TXT_EDH, 265 .algorithm_mkey = SSL_kDHE, 266 .algorithm_auth = ~SSL_aNULL, 267 }, 268 { 269 .name = SSL_TXT_ECDHE, 270 .algorithm_mkey = SSL_kECDHE, 271 .algorithm_auth = ~SSL_aNULL, 272 }, 273 { 274 .name = SSL_TXT_EECDH, 275 .algorithm_mkey = SSL_kECDHE, 276 .algorithm_auth = ~SSL_aNULL, 277 }, 278 { 279 .name = SSL_TXT_NULL, 280 .algorithm_enc = SSL_eNULL, 281 }, 282 { 283 .name = SSL_TXT_RSA, 284 .algorithm_mkey = SSL_kRSA, 285 .algorithm_auth = SSL_aRSA, 286 }, 287 { 288 .name = SSL_TXT_ADH, 289 .algorithm_mkey = SSL_kDHE, 290 .algorithm_auth = SSL_aNULL, 291 }, 292 { 293 .name = SSL_TXT_AECDH, 294 .algorithm_mkey = SSL_kECDHE, 295 .algorithm_auth = SSL_aNULL, 296 }, 297 298 /* symmetric encryption aliases */ 299 { 300 .name = SSL_TXT_3DES, 301 .algorithm_enc = SSL_3DES, 302 }, 303 { 304 .name = SSL_TXT_RC4, 305 .algorithm_enc = SSL_RC4, 306 }, 307 { 308 .name = SSL_TXT_eNULL, 309 .algorithm_enc = SSL_eNULL, 310 }, 311 { 312 .name = SSL_TXT_AES128, 313 .algorithm_enc = SSL_AES128|SSL_AES128GCM, 314 }, 315 { 316 .name = SSL_TXT_AES256, 317 .algorithm_enc = SSL_AES256|SSL_AES256GCM, 318 }, 319 { 320 .name = SSL_TXT_AES, 321 .algorithm_enc = SSL_AES, 322 }, 323 { 324 .name = SSL_TXT_AES_GCM, 325 .algorithm_enc = SSL_AES128GCM|SSL_AES256GCM, 326 }, 327 { 328 .name = SSL_TXT_CAMELLIA128, 329 .algorithm_enc = SSL_CAMELLIA128, 330 }, 331 { 332 .name = SSL_TXT_CAMELLIA256, 333 .algorithm_enc = SSL_CAMELLIA256, 334 }, 335 { 336 .name = SSL_TXT_CAMELLIA, 337 .algorithm_enc = SSL_CAMELLIA128|SSL_CAMELLIA256, 338 }, 339 { 340 .name = SSL_TXT_CHACHA20, 341 .algorithm_enc = SSL_CHACHA20POLY1305, 342 }, 343 344 /* MAC aliases */ 345 { 346 .name = SSL_TXT_AEAD, 347 .algorithm_mac = SSL_AEAD, 348 }, 349 { 350 .name = SSL_TXT_MD5, 351 .algorithm_mac = SSL_MD5, 352 }, 353 { 354 .name = SSL_TXT_SHA1, 355 .algorithm_mac = SSL_SHA1, 356 }, 357 { 358 .name = SSL_TXT_SHA, 359 .algorithm_mac = SSL_SHA1, 360 }, 361 { 362 .name = SSL_TXT_GOST94, 363 .algorithm_mac = SSL_GOST94, 364 }, 365 { 366 .name = SSL_TXT_GOST89MAC, 367 .algorithm_mac = SSL_GOST89MAC, 368 }, 369 { 370 .name = SSL_TXT_SHA256, 371 .algorithm_mac = SSL_SHA256, 372 }, 373 { 374 .name = SSL_TXT_SHA384, 375 .algorithm_mac = SSL_SHA384, 376 }, 377 { 378 .name = SSL_TXT_STREEBOG256, 379 .algorithm_mac = SSL_STREEBOG256, 380 }, 381 382 /* protocol version aliases */ 383 { 384 .name = SSL_TXT_SSLV3, 385 .algorithm_ssl = SSL_SSLV3, 386 }, 387 { 388 .name = SSL_TXT_TLSV1, 389 .algorithm_ssl = SSL_TLSV1, 390 }, 391 { 392 .name = SSL_TXT_TLSV1_2, 393 .algorithm_ssl = SSL_TLSV1_2, 394 }, 395 { 396 .name = SSL_TXT_TLSV1_3, 397 .algorithm_ssl = SSL_TLSV1_3, 398 }, 399 400 /* cipher suite aliases */ 401 #ifdef LIBRESSL_HAS_TLS1_3 402 { 403 .valid = 1, 404 .name = "TLS_AES_128_GCM_SHA256", 405 .id = TLS1_3_CK_AES_128_GCM_SHA256, 406 .algorithm_ssl = SSL_TLSV1_3, 407 }, 408 { 409 .valid = 1, 410 .name = "TLS_AES_256_GCM_SHA384", 411 .id = TLS1_3_CK_AES_256_GCM_SHA384, 412 .algorithm_ssl = SSL_TLSV1_3, 413 }, 414 { 415 .valid = 1, 416 .name = "TLS_CHACHA20_POLY1305_SHA256", 417 .id = TLS1_3_CK_CHACHA20_POLY1305_SHA256, 418 .algorithm_ssl = SSL_TLSV1_3, 419 }, 420 #endif 421 422 /* strength classes */ 423 { 424 .name = SSL_TXT_LOW, 425 .algo_strength = SSL_LOW, 426 }, 427 { 428 .name = SSL_TXT_MEDIUM, 429 .algo_strength = SSL_MEDIUM, 430 }, 431 { 432 .name = SSL_TXT_HIGH, 433 .algo_strength = SSL_HIGH, 434 }, 435 }; 436 437 int 438 ssl_cipher_get_evp(const SSL_SESSION *ss, const EVP_CIPHER **enc, 439 const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size) 440 { 441 *enc = NULL; 442 *md = NULL; 443 *mac_pkey_type = NID_undef; 444 *mac_secret_size = 0; 445 446 if (ss->cipher == NULL) 447 return 0; 448 449 /* 450 * This function does not handle EVP_AEAD. 451 * See ssl_cipher_get_aead_evp instead. 452 */ 453 if (ss->cipher->algorithm_mac & SSL_AEAD) 454 return 0; 455 456 switch (ss->cipher->algorithm_enc) { 457 case SSL_3DES: 458 *enc = EVP_des_ede3_cbc(); 459 break; 460 case SSL_RC4: 461 *enc = EVP_rc4(); 462 break; 463 case SSL_eNULL: 464 *enc = EVP_enc_null(); 465 break; 466 case SSL_AES128: 467 *enc = EVP_aes_128_cbc(); 468 break; 469 case SSL_AES256: 470 *enc = EVP_aes_256_cbc(); 471 break; 472 case SSL_CAMELLIA128: 473 *enc = EVP_camellia_128_cbc(); 474 break; 475 case SSL_CAMELLIA256: 476 *enc = EVP_camellia_256_cbc(); 477 break; 478 case SSL_eGOST2814789CNT: 479 *enc = EVP_gost2814789_cnt(); 480 break; 481 } 482 483 switch (ss->cipher->algorithm_mac) { 484 case SSL_MD5: 485 *md = EVP_md5(); 486 break; 487 case SSL_SHA1: 488 *md = EVP_sha1(); 489 break; 490 case SSL_SHA256: 491 *md = EVP_sha256(); 492 break; 493 case SSL_SHA384: 494 *md = EVP_sha384(); 495 break; 496 case SSL_GOST89MAC: 497 *md = EVP_gost2814789imit(); 498 break; 499 case SSL_GOST94: 500 *md = EVP_gostr341194(); 501 break; 502 case SSL_STREEBOG256: 503 *md = EVP_streebog256(); 504 break; 505 } 506 507 if (*enc == NULL || *md == NULL) 508 return 0; 509 510 /* 511 * EVP_CIPH_FLAG_AEAD_CIPHER and EVP_CIPH_GCM_MODE ciphers are not 512 * supported via EVP_CIPHER (they should be using EVP_AEAD instead). 513 */ 514 if (EVP_CIPHER_flags(*enc) & EVP_CIPH_FLAG_AEAD_CIPHER) 515 return 0; 516 if (EVP_CIPHER_mode(*enc) == EVP_CIPH_GCM_MODE) 517 return 0; 518 519 if (ss->cipher->algorithm_mac == SSL_GOST89MAC) { 520 *mac_pkey_type = EVP_PKEY_GOSTIMIT; 521 *mac_secret_size = 32; /* XXX */ 522 } else { 523 *mac_pkey_type = EVP_PKEY_HMAC; 524 *mac_secret_size = EVP_MD_size(*md); 525 } 526 527 return 1; 528 } 529 530 /* 531 * ssl_cipher_get_evp_aead sets aead to point to the correct EVP_AEAD object 532 * for s->cipher. It returns 1 on success and 0 on error. 533 */ 534 int 535 ssl_cipher_get_evp_aead(const SSL_SESSION *ss, const EVP_AEAD **aead) 536 { 537 *aead = NULL; 538 539 if (ss->cipher == NULL) 540 return 0; 541 if ((ss->cipher->algorithm_mac & SSL_AEAD) == 0) 542 return 0; 543 544 switch (ss->cipher->algorithm_enc) { 545 case SSL_AES128GCM: 546 *aead = EVP_aead_aes_128_gcm(); 547 return 1; 548 case SSL_AES256GCM: 549 *aead = EVP_aead_aes_256_gcm(); 550 return 1; 551 case SSL_CHACHA20POLY1305: 552 *aead = EVP_aead_chacha20_poly1305(); 553 return 1; 554 default: 555 break; 556 } 557 return 0; 558 } 559 560 int 561 ssl_get_handshake_evp_md(SSL *s, const EVP_MD **md) 562 { 563 unsigned long handshake_mac; 564 565 *md = NULL; 566 567 if (S3I(s)->hs.cipher == NULL) 568 return 0; 569 570 handshake_mac = S3I(s)->hs.cipher->algorithm2 & 571 SSL_HANDSHAKE_MAC_MASK; 572 573 /* For TLSv1.2 we upgrade the default MD5+SHA1 MAC to SHA256. */ 574 if (SSL_USE_SHA256_PRF(s) && handshake_mac == SSL_HANDSHAKE_MAC_DEFAULT) 575 handshake_mac = SSL_HANDSHAKE_MAC_SHA256; 576 577 switch (handshake_mac) { 578 case SSL_HANDSHAKE_MAC_DEFAULT: 579 *md = EVP_md5_sha1(); 580 return 1; 581 case SSL_HANDSHAKE_MAC_GOST94: 582 *md = EVP_gostr341194(); 583 return 1; 584 case SSL_HANDSHAKE_MAC_SHA256: 585 *md = EVP_sha256(); 586 return 1; 587 case SSL_HANDSHAKE_MAC_SHA384: 588 *md = EVP_sha384(); 589 return 1; 590 case SSL_HANDSHAKE_MAC_STREEBOG256: 591 *md = EVP_streebog256(); 592 return 1; 593 default: 594 break; 595 } 596 597 return 0; 598 } 599 600 #define ITEM_SEP(a) \ 601 (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ',')) 602 603 static void 604 ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr, 605 CIPHER_ORDER **tail) 606 { 607 if (curr == *tail) 608 return; 609 if (curr == *head) 610 *head = curr->next; 611 if (curr->prev != NULL) 612 curr->prev->next = curr->next; 613 if (curr->next != NULL) 614 curr->next->prev = curr->prev; 615 (*tail)->next = curr; 616 curr->prev= *tail; 617 curr->next = NULL; 618 *tail = curr; 619 } 620 621 static void 622 ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr, 623 CIPHER_ORDER **tail) 624 { 625 if (curr == *head) 626 return; 627 if (curr == *tail) 628 *tail = curr->prev; 629 if (curr->next != NULL) 630 curr->next->prev = curr->prev; 631 if (curr->prev != NULL) 632 curr->prev->next = curr->next; 633 (*head)->prev = curr; 634 curr->next= *head; 635 curr->prev = NULL; 636 *head = curr; 637 } 638 639 static void 640 ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth, 641 unsigned long *enc, unsigned long *mac, unsigned long *ssl) 642 { 643 *mkey = 0; 644 *auth = 0; 645 *enc = 0; 646 *mac = 0; 647 *ssl = 0; 648 649 /* 650 * Check for the availability of GOST 34.10 public/private key 651 * algorithms. If they are not available disable the associated 652 * authentication and key exchange algorithms. 653 */ 654 if (EVP_PKEY_meth_find(NID_id_GostR3410_2001) == NULL) { 655 *auth |= SSL_aGOST01; 656 *mkey |= SSL_kGOST; 657 } 658 659 #ifdef SSL_FORBID_ENULL 660 *enc |= SSL_eNULL; 661 #endif 662 } 663 664 static void 665 ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method, int num_of_ciphers, 666 unsigned long disabled_mkey, unsigned long disabled_auth, 667 unsigned long disabled_enc, unsigned long disabled_mac, 668 unsigned long disabled_ssl, CIPHER_ORDER *co_list, 669 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 670 { 671 int i, co_list_num; 672 const SSL_CIPHER *c; 673 674 /* 675 * We have num_of_ciphers descriptions compiled in, depending on the 676 * method selected (SSLv3, TLSv1, etc). These will later be sorted in 677 * a linked list with at most num entries. 678 */ 679 680 /* Get the initial list of ciphers */ 681 co_list_num = 0; /* actual count of ciphers */ 682 for (i = 0; i < num_of_ciphers; i++) { 683 c = ssl_method->get_cipher(i); 684 /* drop those that use any of that is not available */ 685 if ((c != NULL) && c->valid && 686 !(c->algorithm_mkey & disabled_mkey) && 687 !(c->algorithm_auth & disabled_auth) && 688 !(c->algorithm_enc & disabled_enc) && 689 !(c->algorithm_mac & disabled_mac) && 690 !(c->algorithm_ssl & disabled_ssl)) { 691 co_list[co_list_num].cipher = c; 692 co_list[co_list_num].next = NULL; 693 co_list[co_list_num].prev = NULL; 694 co_list[co_list_num].active = 0; 695 co_list_num++; 696 /* 697 if (!sk_push(ca_list,(char *)c)) goto err; 698 */ 699 } 700 } 701 702 /* 703 * Prepare linked list from list entries 704 */ 705 if (co_list_num > 0) { 706 co_list[0].prev = NULL; 707 708 if (co_list_num > 1) { 709 co_list[0].next = &co_list[1]; 710 711 for (i = 1; i < co_list_num - 1; i++) { 712 co_list[i].prev = &co_list[i - 1]; 713 co_list[i].next = &co_list[i + 1]; 714 } 715 716 co_list[co_list_num - 1].prev = 717 &co_list[co_list_num - 2]; 718 } 719 720 co_list[co_list_num - 1].next = NULL; 721 722 *head_p = &co_list[0]; 723 *tail_p = &co_list[co_list_num - 1]; 724 } 725 } 726 727 static void 728 ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list, int num_of_group_aliases, 729 unsigned long disabled_mkey, unsigned long disabled_auth, 730 unsigned long disabled_enc, unsigned long disabled_mac, 731 unsigned long disabled_ssl, CIPHER_ORDER *head) 732 { 733 CIPHER_ORDER *ciph_curr; 734 const SSL_CIPHER **ca_curr; 735 int i; 736 unsigned long mask_mkey = ~disabled_mkey; 737 unsigned long mask_auth = ~disabled_auth; 738 unsigned long mask_enc = ~disabled_enc; 739 unsigned long mask_mac = ~disabled_mac; 740 unsigned long mask_ssl = ~disabled_ssl; 741 742 /* 743 * First, add the real ciphers as already collected 744 */ 745 ciph_curr = head; 746 ca_curr = ca_list; 747 while (ciph_curr != NULL) { 748 *ca_curr = ciph_curr->cipher; 749 ca_curr++; 750 ciph_curr = ciph_curr->next; 751 } 752 753 /* 754 * Now we add the available ones from the cipher_aliases[] table. 755 * They represent either one or more algorithms, some of which 756 * in any affected category must be supported (set in enabled_mask), 757 * or represent a cipher strength value (will be added in any case because algorithms=0). 758 */ 759 for (i = 0; i < num_of_group_aliases; i++) { 760 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey; 761 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth; 762 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc; 763 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac; 764 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl; 765 766 if (algorithm_mkey) 767 if ((algorithm_mkey & mask_mkey) == 0) 768 continue; 769 770 if (algorithm_auth) 771 if ((algorithm_auth & mask_auth) == 0) 772 continue; 773 774 if (algorithm_enc) 775 if ((algorithm_enc & mask_enc) == 0) 776 continue; 777 778 if (algorithm_mac) 779 if ((algorithm_mac & mask_mac) == 0) 780 continue; 781 782 if (algorithm_ssl) 783 if ((algorithm_ssl & mask_ssl) == 0) 784 continue; 785 786 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i); 787 ca_curr++; 788 } 789 790 *ca_curr = NULL; /* end of list */ 791 } 792 793 static void 794 ssl_cipher_apply_rule(unsigned long cipher_id, unsigned long alg_mkey, 795 unsigned long alg_auth, unsigned long alg_enc, unsigned long alg_mac, 796 unsigned long alg_ssl, unsigned long algo_strength, int rule, 797 int strength_bits, CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 798 { 799 CIPHER_ORDER *head, *tail, *curr, *next, *last; 800 const SSL_CIPHER *cp; 801 int reverse = 0; 802 803 if (rule == CIPHER_DEL) 804 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */ 805 806 head = *head_p; 807 tail = *tail_p; 808 809 if (reverse) { 810 next = tail; 811 last = head; 812 } else { 813 next = head; 814 last = tail; 815 } 816 817 curr = NULL; 818 for (;;) { 819 if (curr == last) 820 break; 821 curr = next; 822 next = reverse ? curr->prev : curr->next; 823 824 cp = curr->cipher; 825 826 if (cipher_id && cp->id != cipher_id) 827 continue; 828 829 /* 830 * Selection criteria is either the value of strength_bits 831 * or the algorithms used. 832 */ 833 if (strength_bits >= 0) { 834 if (strength_bits != cp->strength_bits) 835 continue; 836 } else { 837 if (alg_mkey && !(alg_mkey & cp->algorithm_mkey)) 838 continue; 839 if (alg_auth && !(alg_auth & cp->algorithm_auth)) 840 continue; 841 if (alg_enc && !(alg_enc & cp->algorithm_enc)) 842 continue; 843 if (alg_mac && !(alg_mac & cp->algorithm_mac)) 844 continue; 845 if (alg_ssl && !(alg_ssl & cp->algorithm_ssl)) 846 continue; 847 if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength)) 848 continue; 849 } 850 851 /* add the cipher if it has not been added yet. */ 852 if (rule == CIPHER_ADD) { 853 /* reverse == 0 */ 854 if (!curr->active) { 855 ll_append_tail(&head, curr, &tail); 856 curr->active = 1; 857 } 858 } 859 /* Move the added cipher to this location */ 860 else if (rule == CIPHER_ORD) { 861 /* reverse == 0 */ 862 if (curr->active) { 863 ll_append_tail(&head, curr, &tail); 864 } 865 } else if (rule == CIPHER_DEL) { 866 /* reverse == 1 */ 867 if (curr->active) { 868 /* most recently deleted ciphersuites get best positions 869 * for any future CIPHER_ADD (note that the CIPHER_DEL loop 870 * works in reverse to maintain the order) */ 871 ll_append_head(&head, curr, &tail); 872 curr->active = 0; 873 } 874 } else if (rule == CIPHER_KILL) { 875 /* reverse == 0 */ 876 if (head == curr) 877 head = curr->next; 878 else 879 curr->prev->next = curr->next; 880 if (tail == curr) 881 tail = curr->prev; 882 curr->active = 0; 883 if (curr->next != NULL) 884 curr->next->prev = curr->prev; 885 if (curr->prev != NULL) 886 curr->prev->next = curr->next; 887 curr->next = NULL; 888 curr->prev = NULL; 889 } 890 } 891 892 *head_p = head; 893 *tail_p = tail; 894 } 895 896 static int 897 ssl_cipher_strength_sort(CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 898 { 899 int max_strength_bits, i, *number_uses; 900 CIPHER_ORDER *curr; 901 902 /* 903 * This routine sorts the ciphers with descending strength. The sorting 904 * must keep the pre-sorted sequence, so we apply the normal sorting 905 * routine as '+' movement to the end of the list. 906 */ 907 max_strength_bits = 0; 908 curr = *head_p; 909 while (curr != NULL) { 910 if (curr->active && 911 (curr->cipher->strength_bits > max_strength_bits)) 912 max_strength_bits = curr->cipher->strength_bits; 913 curr = curr->next; 914 } 915 916 number_uses = calloc((max_strength_bits + 1), sizeof(int)); 917 if (!number_uses) { 918 SSLerrorx(ERR_R_MALLOC_FAILURE); 919 return (0); 920 } 921 922 /* 923 * Now find the strength_bits values actually used 924 */ 925 curr = *head_p; 926 while (curr != NULL) { 927 if (curr->active) 928 number_uses[curr->cipher->strength_bits]++; 929 curr = curr->next; 930 } 931 /* 932 * Go through the list of used strength_bits values in descending 933 * order. 934 */ 935 for (i = max_strength_bits; i >= 0; i--) 936 if (number_uses[i] > 0) 937 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p); 938 939 free(number_uses); 940 return (1); 941 } 942 943 static int 944 ssl_cipher_process_rulestr(const char *rule_str, CIPHER_ORDER **head_p, 945 CIPHER_ORDER **tail_p, const SSL_CIPHER **ca_list, int *tls13_seen) 946 { 947 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl; 948 unsigned long algo_strength; 949 int j, multi, found, rule, retval, ok, buflen; 950 unsigned long cipher_id = 0; 951 const char *l, *buf; 952 char ch; 953 954 *tls13_seen = 0; 955 956 retval = 1; 957 l = rule_str; 958 for (;;) { 959 ch = *l; 960 961 if (ch == '\0') 962 break; 963 964 if (ch == '-') { 965 rule = CIPHER_DEL; 966 l++; 967 } else if (ch == '+') { 968 rule = CIPHER_ORD; 969 l++; 970 } else if (ch == '!') { 971 rule = CIPHER_KILL; 972 l++; 973 } else if (ch == '@') { 974 rule = CIPHER_SPECIAL; 975 l++; 976 } else { 977 rule = CIPHER_ADD; 978 } 979 980 if (ITEM_SEP(ch)) { 981 l++; 982 continue; 983 } 984 985 alg_mkey = 0; 986 alg_auth = 0; 987 alg_enc = 0; 988 alg_mac = 0; 989 alg_ssl = 0; 990 algo_strength = 0; 991 992 for (;;) { 993 ch = *l; 994 buf = l; 995 buflen = 0; 996 while (((ch >= 'A') && (ch <= 'Z')) || 997 ((ch >= '0') && (ch <= '9')) || 998 ((ch >= 'a') && (ch <= 'z')) || 999 (ch == '-') || (ch == '.') || 1000 (ch == '_')) { 1001 ch = *(++l); 1002 buflen++; 1003 } 1004 1005 if (buflen == 0) { 1006 /* 1007 * We hit something we cannot deal with, 1008 * it is no command or separator nor 1009 * alphanumeric, so we call this an error. 1010 */ 1011 SSLerrorx(SSL_R_INVALID_COMMAND); 1012 retval = found = 0; 1013 l++; 1014 break; 1015 } 1016 1017 if (rule == CIPHER_SPECIAL) { 1018 /* unused -- avoid compiler warning */ 1019 found = 0; 1020 /* special treatment */ 1021 break; 1022 } 1023 1024 /* check for multi-part specification */ 1025 if (ch == '+') { 1026 multi = 1; 1027 l++; 1028 } else 1029 multi = 0; 1030 1031 /* 1032 * Now search for the cipher alias in the ca_list. 1033 * Be careful with the strncmp, because the "buflen" 1034 * limitation will make the rule "ADH:SOME" and the 1035 * cipher "ADH-MY-CIPHER" look like a match for 1036 * buflen=3. So additionally check whether the cipher 1037 * name found has the correct length. We can save a 1038 * strlen() call: just checking for the '\0' at the 1039 * right place is sufficient, we have to strncmp() 1040 * anyway (we cannot use strcmp(), because buf is not 1041 * '\0' terminated.) 1042 */ 1043 j = found = 0; 1044 cipher_id = 0; 1045 while (ca_list[j]) { 1046 if (!strncmp(buf, ca_list[j]->name, buflen) && 1047 (ca_list[j]->name[buflen] == '\0')) { 1048 found = 1; 1049 break; 1050 } else 1051 j++; 1052 } 1053 1054 if (!found) 1055 break; /* ignore this entry */ 1056 1057 if (ca_list[j]->algorithm_mkey) { 1058 if (alg_mkey) { 1059 alg_mkey &= ca_list[j]->algorithm_mkey; 1060 if (!alg_mkey) { 1061 found = 0; 1062 break; 1063 } 1064 } else 1065 alg_mkey = ca_list[j]->algorithm_mkey; 1066 } 1067 1068 if (ca_list[j]->algorithm_auth) { 1069 if (alg_auth) { 1070 alg_auth &= ca_list[j]->algorithm_auth; 1071 if (!alg_auth) { 1072 found = 0; 1073 break; 1074 } 1075 } else 1076 alg_auth = ca_list[j]->algorithm_auth; 1077 } 1078 1079 if (ca_list[j]->algorithm_enc) { 1080 if (alg_enc) { 1081 alg_enc &= ca_list[j]->algorithm_enc; 1082 if (!alg_enc) { 1083 found = 0; 1084 break; 1085 } 1086 } else 1087 alg_enc = ca_list[j]->algorithm_enc; 1088 } 1089 1090 if (ca_list[j]->algorithm_mac) { 1091 if (alg_mac) { 1092 alg_mac &= ca_list[j]->algorithm_mac; 1093 if (!alg_mac) { 1094 found = 0; 1095 break; 1096 } 1097 } else 1098 alg_mac = ca_list[j]->algorithm_mac; 1099 } 1100 1101 if (ca_list[j]->algo_strength & SSL_STRONG_MASK) { 1102 if (algo_strength & SSL_STRONG_MASK) { 1103 algo_strength &= 1104 (ca_list[j]->algo_strength & 1105 SSL_STRONG_MASK) | ~SSL_STRONG_MASK; 1106 if (!(algo_strength & 1107 SSL_STRONG_MASK)) { 1108 found = 0; 1109 break; 1110 } 1111 } else 1112 algo_strength |= 1113 ca_list[j]->algo_strength & 1114 SSL_STRONG_MASK; 1115 } 1116 1117 if (ca_list[j]->valid) { 1118 /* 1119 * explicit ciphersuite found; its protocol 1120 * version does not become part of the search 1121 * pattern! 1122 */ 1123 cipher_id = ca_list[j]->id; 1124 if (ca_list[j]->algorithm_ssl == SSL_TLSV1_3) 1125 *tls13_seen = 1; 1126 } else { 1127 /* 1128 * not an explicit ciphersuite; only in this 1129 * case, the protocol version is considered 1130 * part of the search pattern 1131 */ 1132 if (ca_list[j]->algorithm_ssl) { 1133 if (alg_ssl) { 1134 alg_ssl &= 1135 ca_list[j]->algorithm_ssl; 1136 if (!alg_ssl) { 1137 found = 0; 1138 break; 1139 } 1140 } else 1141 alg_ssl = 1142 ca_list[j]->algorithm_ssl; 1143 } 1144 } 1145 1146 if (!multi) 1147 break; 1148 } 1149 1150 /* 1151 * Ok, we have the rule, now apply it 1152 */ 1153 if (rule == CIPHER_SPECIAL) { 1154 /* special command */ 1155 ok = 0; 1156 if ((buflen == 8) && !strncmp(buf, "STRENGTH", 8)) 1157 ok = ssl_cipher_strength_sort(head_p, tail_p); 1158 else 1159 SSLerrorx(SSL_R_INVALID_COMMAND); 1160 if (ok == 0) 1161 retval = 0; 1162 /* 1163 * We do not support any "multi" options 1164 * together with "@", so throw away the 1165 * rest of the command, if any left, until 1166 * end or ':' is found. 1167 */ 1168 while ((*l != '\0') && !ITEM_SEP(*l)) 1169 l++; 1170 } else if (found) { 1171 if (alg_ssl == SSL_TLSV1_3) 1172 *tls13_seen = 1; 1173 ssl_cipher_apply_rule(cipher_id, alg_mkey, alg_auth, 1174 alg_enc, alg_mac, alg_ssl, algo_strength, rule, 1175 -1, head_p, tail_p); 1176 } else { 1177 while ((*l != '\0') && !ITEM_SEP(*l)) 1178 l++; 1179 } 1180 if (*l == '\0') 1181 break; /* done */ 1182 } 1183 1184 return (retval); 1185 } 1186 1187 static inline int 1188 ssl_aes_is_accelerated(void) 1189 { 1190 #if defined(__i386__) || defined(__x86_64__) 1191 return ((OPENSSL_cpu_caps() & (1ULL << 57)) != 0); 1192 #else 1193 return (0); 1194 #endif 1195 } 1196 1197 STACK_OF(SSL_CIPHER) * 1198 ssl_create_cipher_list(const SSL_METHOD *ssl_method, 1199 STACK_OF(SSL_CIPHER) **cipher_list, 1200 STACK_OF(SSL_CIPHER) *cipher_list_tls13, 1201 const char *rule_str) 1202 { 1203 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases; 1204 unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl; 1205 STACK_OF(SSL_CIPHER) *cipherstack; 1206 const char *rule_p; 1207 CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr; 1208 const SSL_CIPHER **ca_list = NULL; 1209 const SSL_CIPHER *cipher; 1210 int tls13_seen = 0; 1211 int any_active; 1212 int i; 1213 1214 /* 1215 * Return with error if nothing to do. 1216 */ 1217 if (rule_str == NULL || cipher_list == NULL) 1218 return NULL; 1219 1220 /* 1221 * To reduce the work to do we only want to process the compiled 1222 * in algorithms, so we first get the mask of disabled ciphers. 1223 */ 1224 ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl); 1225 1226 /* 1227 * Now we have to collect the available ciphers from the compiled 1228 * in ciphers. We cannot get more than the number compiled in, so 1229 * it is used for allocation. 1230 */ 1231 num_of_ciphers = ssl3_num_ciphers(); 1232 co_list = reallocarray(NULL, num_of_ciphers, sizeof(CIPHER_ORDER)); 1233 if (co_list == NULL) { 1234 SSLerrorx(ERR_R_MALLOC_FAILURE); 1235 return(NULL); /* Failure */ 1236 } 1237 1238 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, 1239 disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl, 1240 co_list, &head, &tail); 1241 1242 1243 /* Now arrange all ciphers by preference: */ 1244 1245 /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */ 1246 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1247 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail); 1248 1249 if (ssl_aes_is_accelerated()) { 1250 /* 1251 * We have hardware assisted AES - prefer AES as a symmetric 1252 * cipher, with CHACHA20 second. 1253 */ 1254 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, 1255 CIPHER_ADD, -1, &head, &tail); 1256 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305, 1257 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1258 } else { 1259 /* 1260 * CHACHA20 is fast and safe on all hardware and is thus our 1261 * preferred symmetric cipher, with AES second. 1262 */ 1263 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305, 1264 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1265 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, 1266 CIPHER_ADD, -1, &head, &tail); 1267 } 1268 1269 /* Temporarily enable everything else for sorting */ 1270 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1271 1272 /* Low priority for MD5 */ 1273 ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail); 1274 1275 /* Move anonymous ciphers to the end. Usually, these will remain disabled. 1276 * (For applications that allow them, they aren't too bad, but we prefer 1277 * authenticated ciphers.) */ 1278 ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1279 1280 /* Move ciphers without forward secrecy to the end */ 1281 ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1282 1283 /* RC4 is sort of broken - move it to the end */ 1284 ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1285 1286 /* Now sort by symmetric encryption strength. The above ordering remains 1287 * in force within each class */ 1288 if (!ssl_cipher_strength_sort(&head, &tail)) { 1289 free(co_list); 1290 return NULL; 1291 } 1292 1293 /* Now disable everything (maintaining the ordering!) */ 1294 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail); 1295 1296 /* TLSv1.3 first. */ 1297 ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_ADD, -1, &head, &tail); 1298 ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_DEL, -1, &head, &tail); 1299 1300 /* 1301 * We also need cipher aliases for selecting based on the rule_str. 1302 * There might be two types of entries in the rule_str: 1) names 1303 * of ciphers themselves 2) aliases for groups of ciphers. 1304 * For 1) we need the available ciphers and for 2) the cipher 1305 * groups of cipher_aliases added together in one list (otherwise 1306 * we would be happy with just the cipher_aliases table). 1307 */ 1308 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER); 1309 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1; 1310 ca_list = reallocarray(NULL, num_of_alias_max, sizeof(SSL_CIPHER *)); 1311 if (ca_list == NULL) { 1312 free(co_list); 1313 SSLerrorx(ERR_R_MALLOC_FAILURE); 1314 return(NULL); /* Failure */ 1315 } 1316 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mkey, 1317 disabled_auth, disabled_enc, disabled_mac, disabled_ssl, head); 1318 1319 /* 1320 * If the rule_string begins with DEFAULT, apply the default rule 1321 * before using the (possibly available) additional rules. 1322 */ 1323 ok = 1; 1324 rule_p = rule_str; 1325 if (strncmp(rule_str, "DEFAULT", 7) == 0) { 1326 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST, 1327 &head, &tail, ca_list, &tls13_seen); 1328 rule_p += 7; 1329 if (*rule_p == ':') 1330 rule_p++; 1331 } 1332 1333 if (ok && (strlen(rule_p) > 0)) 1334 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list, 1335 &tls13_seen); 1336 1337 free((void *)ca_list); /* Not needed anymore */ 1338 1339 if (!ok) { 1340 /* Rule processing failure */ 1341 free(co_list); 1342 return (NULL); 1343 } 1344 1345 /* 1346 * Allocate new "cipherstack" for the result, return with error 1347 * if we cannot get one. 1348 */ 1349 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) { 1350 free(co_list); 1351 return (NULL); 1352 } 1353 1354 /* Prefer TLSv1.3 cipher suites. */ 1355 if (cipher_list_tls13 != NULL) { 1356 for (i = 0; i < sk_SSL_CIPHER_num(cipher_list_tls13); i++) { 1357 cipher = sk_SSL_CIPHER_value(cipher_list_tls13, i); 1358 sk_SSL_CIPHER_push(cipherstack, cipher); 1359 } 1360 tls13_seen = 1; 1361 } 1362 1363 /* 1364 * The cipher selection for the list is done. The ciphers are added 1365 * to the resulting precedence to the STACK_OF(SSL_CIPHER). 1366 * 1367 * If the rule string did not contain any references to TLSv1.3 and 1368 * TLSv1.3 cipher suites have not been configured separately, 1369 * include inactive TLSv1.3 cipher suites. This avoids attempts to 1370 * use TLSv1.3 with an older rule string that does not include 1371 * TLSv1.3 cipher suites. If the rule string resulted in no active 1372 * cipher suites then we return an empty stack. 1373 */ 1374 any_active = 0; 1375 for (curr = head; curr != NULL; curr = curr->next) { 1376 if (curr->active || 1377 (!tls13_seen && curr->cipher->algorithm_ssl == SSL_TLSV1_3)) 1378 sk_SSL_CIPHER_push(cipherstack, curr->cipher); 1379 any_active |= curr->active; 1380 } 1381 if (!any_active) 1382 sk_SSL_CIPHER_zero(cipherstack); 1383 1384 free(co_list); /* Not needed any longer */ 1385 1386 sk_SSL_CIPHER_free(*cipher_list); 1387 *cipher_list = cipherstack; 1388 1389 return (cipherstack); 1390 } 1391 1392 const SSL_CIPHER * 1393 SSL_CIPHER_get_by_id(unsigned int id) 1394 { 1395 return ssl3_get_cipher_by_id(id); 1396 } 1397 1398 const SSL_CIPHER * 1399 SSL_CIPHER_get_by_value(uint16_t value) 1400 { 1401 return ssl3_get_cipher_by_value(value); 1402 } 1403 1404 char * 1405 SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len) 1406 { 1407 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, alg2; 1408 const char *ver, *kx, *au, *enc, *mac; 1409 char *ret; 1410 int l; 1411 1412 alg_mkey = cipher->algorithm_mkey; 1413 alg_auth = cipher->algorithm_auth; 1414 alg_enc = cipher->algorithm_enc; 1415 alg_mac = cipher->algorithm_mac; 1416 alg_ssl = cipher->algorithm_ssl; 1417 1418 alg2 = cipher->algorithm2; 1419 1420 if (alg_ssl & SSL_SSLV3) 1421 ver = "SSLv3"; 1422 else if (alg_ssl & SSL_TLSV1_2) 1423 ver = "TLSv1.2"; 1424 else if (alg_ssl & SSL_TLSV1_3) 1425 ver = "TLSv1.3"; 1426 else 1427 ver = "unknown"; 1428 1429 switch (alg_mkey) { 1430 case SSL_kRSA: 1431 kx = "RSA"; 1432 break; 1433 case SSL_kDHE: 1434 kx = "DH"; 1435 break; 1436 case SSL_kECDHE: 1437 kx = "ECDH"; 1438 break; 1439 case SSL_kGOST: 1440 kx = "GOST"; 1441 break; 1442 case SSL_kTLS1_3: 1443 kx = "TLSv1.3"; 1444 break; 1445 default: 1446 kx = "unknown"; 1447 } 1448 1449 switch (alg_auth) { 1450 case SSL_aRSA: 1451 au = "RSA"; 1452 break; 1453 case SSL_aDSS: 1454 au = "DSS"; 1455 break; 1456 case SSL_aNULL: 1457 au = "None"; 1458 break; 1459 case SSL_aECDSA: 1460 au = "ECDSA"; 1461 break; 1462 case SSL_aGOST01: 1463 au = "GOST01"; 1464 break; 1465 case SSL_aTLS1_3: 1466 au = "TLSv1.3"; 1467 break; 1468 default: 1469 au = "unknown"; 1470 break; 1471 } 1472 1473 switch (alg_enc) { 1474 case SSL_3DES: 1475 enc = "3DES(168)"; 1476 break; 1477 case SSL_RC4: 1478 enc = alg2 & SSL2_CF_8_BYTE_ENC ? "RC4(64)" : "RC4(128)"; 1479 break; 1480 case SSL_eNULL: 1481 enc = "None"; 1482 break; 1483 case SSL_AES128: 1484 enc = "AES(128)"; 1485 break; 1486 case SSL_AES256: 1487 enc = "AES(256)"; 1488 break; 1489 case SSL_AES128GCM: 1490 enc = "AESGCM(128)"; 1491 break; 1492 case SSL_AES256GCM: 1493 enc = "AESGCM(256)"; 1494 break; 1495 case SSL_CAMELLIA128: 1496 enc = "Camellia(128)"; 1497 break; 1498 case SSL_CAMELLIA256: 1499 enc = "Camellia(256)"; 1500 break; 1501 case SSL_CHACHA20POLY1305: 1502 enc = "ChaCha20-Poly1305"; 1503 break; 1504 case SSL_eGOST2814789CNT: 1505 enc = "GOST-28178-89-CNT"; 1506 break; 1507 default: 1508 enc = "unknown"; 1509 break; 1510 } 1511 1512 switch (alg_mac) { 1513 case SSL_MD5: 1514 mac = "MD5"; 1515 break; 1516 case SSL_SHA1: 1517 mac = "SHA1"; 1518 break; 1519 case SSL_SHA256: 1520 mac = "SHA256"; 1521 break; 1522 case SSL_SHA384: 1523 mac = "SHA384"; 1524 break; 1525 case SSL_AEAD: 1526 mac = "AEAD"; 1527 break; 1528 case SSL_GOST94: 1529 mac = "GOST94"; 1530 break; 1531 case SSL_GOST89MAC: 1532 mac = "GOST89IMIT"; 1533 break; 1534 case SSL_STREEBOG256: 1535 mac = "STREEBOG256"; 1536 break; 1537 default: 1538 mac = "unknown"; 1539 break; 1540 } 1541 1542 if (asprintf(&ret, "%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s\n", 1543 cipher->name, ver, kx, au, enc, mac) == -1) 1544 return "OPENSSL_malloc Error"; 1545 1546 if (buf != NULL) { 1547 l = strlcpy(buf, ret, len); 1548 free(ret); 1549 ret = buf; 1550 if (l >= len) 1551 ret = "Buffer too small"; 1552 } 1553 1554 return (ret); 1555 } 1556 1557 const char * 1558 SSL_CIPHER_get_version(const SSL_CIPHER *c) 1559 { 1560 if (c == NULL) 1561 return("(NONE)"); 1562 if ((c->id >> 24) == 3) 1563 return("TLSv1/SSLv3"); 1564 else 1565 return("unknown"); 1566 } 1567 1568 /* return the actual cipher being used */ 1569 const char * 1570 SSL_CIPHER_get_name(const SSL_CIPHER *c) 1571 { 1572 if (c != NULL) 1573 return (c->name); 1574 return("(NONE)"); 1575 } 1576 1577 /* number of bits for symmetric cipher */ 1578 int 1579 SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits) 1580 { 1581 int ret = 0; 1582 1583 if (c != NULL) { 1584 if (alg_bits != NULL) 1585 *alg_bits = c->alg_bits; 1586 ret = c->strength_bits; 1587 } 1588 return (ret); 1589 } 1590 1591 unsigned long 1592 SSL_CIPHER_get_id(const SSL_CIPHER *c) 1593 { 1594 return c->id; 1595 } 1596 1597 uint16_t 1598 SSL_CIPHER_get_value(const SSL_CIPHER *c) 1599 { 1600 return ssl3_cipher_get_value(c); 1601 } 1602 1603 const SSL_CIPHER * 1604 SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr) 1605 { 1606 uint16_t cipher_value; 1607 CBS cbs; 1608 1609 /* This API is documented with ptr being an array of length two. */ 1610 CBS_init(&cbs, ptr, 2); 1611 if (!CBS_get_u16(&cbs, &cipher_value)) 1612 return NULL; 1613 1614 return ssl3_get_cipher_by_value(cipher_value); 1615 } 1616 1617 int 1618 SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c) 1619 { 1620 switch (c->algorithm_enc) { 1621 case SSL_eNULL: 1622 return NID_undef; 1623 case SSL_3DES: 1624 return NID_des_ede3_cbc; 1625 case SSL_AES128: 1626 return NID_aes_128_cbc; 1627 case SSL_AES128GCM: 1628 return NID_aes_128_gcm; 1629 case SSL_AES256: 1630 return NID_aes_256_cbc; 1631 case SSL_AES256GCM: 1632 return NID_aes_256_gcm; 1633 case SSL_CAMELLIA128: 1634 return NID_camellia_128_cbc; 1635 case SSL_CAMELLIA256: 1636 return NID_camellia_256_cbc; 1637 case SSL_CHACHA20POLY1305: 1638 return NID_chacha20_poly1305; 1639 case SSL_DES: 1640 return NID_des_cbc; 1641 case SSL_RC4: 1642 return NID_rc4; 1643 case SSL_eGOST2814789CNT: 1644 return NID_gost89_cnt; 1645 default: 1646 return NID_undef; 1647 } 1648 } 1649 1650 int 1651 SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c) 1652 { 1653 switch (c->algorithm_mac) { 1654 case SSL_AEAD: 1655 return NID_undef; 1656 case SSL_GOST89MAC: 1657 return NID_id_Gost28147_89_MAC; 1658 case SSL_GOST94: 1659 return NID_id_GostR3411_94; 1660 case SSL_MD5: 1661 return NID_md5; 1662 case SSL_SHA1: 1663 return NID_sha1; 1664 case SSL_SHA256: 1665 return NID_sha256; 1666 case SSL_SHA384: 1667 return NID_sha384; 1668 case SSL_STREEBOG256: 1669 return NID_id_tc26_gost3411_2012_256; 1670 default: 1671 return NID_undef; 1672 } 1673 } 1674 1675 int 1676 SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c) 1677 { 1678 switch (c->algorithm_mkey) { 1679 case SSL_kDHE: 1680 return NID_kx_dhe; 1681 case SSL_kECDHE: 1682 return NID_kx_ecdhe; 1683 case SSL_kGOST: 1684 return NID_kx_gost; 1685 case SSL_kRSA: 1686 return NID_kx_rsa; 1687 default: 1688 return NID_undef; 1689 } 1690 } 1691 1692 int 1693 SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c) 1694 { 1695 switch (c->algorithm_auth) { 1696 case SSL_aNULL: 1697 return NID_auth_null; 1698 case SSL_aECDSA: 1699 return NID_auth_ecdsa; 1700 case SSL_aGOST01: 1701 return NID_auth_gost01; 1702 case SSL_aRSA: 1703 return NID_auth_rsa; 1704 default: 1705 return NID_undef; 1706 } 1707 } 1708 1709 int 1710 SSL_CIPHER_is_aead(const SSL_CIPHER *c) 1711 { 1712 return (c->algorithm_mac & SSL_AEAD) == SSL_AEAD; 1713 } 1714 1715 void * 1716 SSL_COMP_get_compression_methods(void) 1717 { 1718 return NULL; 1719 } 1720 1721 int 1722 SSL_COMP_add_compression_method(int id, void *cm) 1723 { 1724 return 1; 1725 } 1726 1727 const char * 1728 SSL_COMP_get_name(const void *comp) 1729 { 1730 return NULL; 1731 } 1732