1 /* $OpenBSD: ssl_ciph.c,v 1.129 2022/06/29 20:06:55 tb Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * ECC cipher suite support in OpenSSL originally developed by 114 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. 115 */ 116 /* ==================================================================== 117 * Copyright 2005 Nokia. All rights reserved. 118 * 119 * The portions of the attached software ("Contribution") is developed by 120 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 121 * license. 122 * 123 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 124 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 125 * support (see RFC 4279) to OpenSSL. 126 * 127 * No patent licenses or other rights except those expressly stated in 128 * the OpenSSL open source license shall be deemed granted or received 129 * expressly, by implication, estoppel, or otherwise. 130 * 131 * No assurances are provided by Nokia that the Contribution does not 132 * infringe the patent or other intellectual property rights of any third 133 * party or that the license provides you with all the necessary rights 134 * to make use of the Contribution. 135 * 136 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 137 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 138 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 139 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 140 * OTHERWISE. 141 */ 142 143 #include <stdio.h> 144 145 #include <openssl/objects.h> 146 #include <openssl/opensslconf.h> 147 148 #ifndef OPENSSL_NO_ENGINE 149 #include <openssl/engine.h> 150 #endif 151 152 #include "ssl_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_evp_aead instead. 452 */ 453 if (ss->cipher->algorithm_mac & SSL_AEAD) 454 return 0; 455 456 switch (ss->cipher->algorithm_enc) { 457 case SSL_3DES: 458 *enc = EVP_des_ede3_cbc(); 459 break; 460 case SSL_RC4: 461 *enc = EVP_rc4(); 462 break; 463 case SSL_eNULL: 464 *enc = EVP_enc_null(); 465 break; 466 case SSL_AES128: 467 *enc = EVP_aes_128_cbc(); 468 break; 469 case SSL_AES256: 470 *enc = EVP_aes_256_cbc(); 471 break; 472 case SSL_CAMELLIA128: 473 *enc = EVP_camellia_128_cbc(); 474 break; 475 case SSL_CAMELLIA256: 476 *enc = EVP_camellia_256_cbc(); 477 break; 478 case SSL_eGOST2814789CNT: 479 *enc = EVP_gost2814789_cnt(); 480 break; 481 } 482 483 switch (ss->cipher->algorithm_mac) { 484 case SSL_MD5: 485 *md = EVP_md5(); 486 break; 487 case SSL_SHA1: 488 *md = EVP_sha1(); 489 break; 490 case SSL_SHA256: 491 *md = EVP_sha256(); 492 break; 493 case SSL_SHA384: 494 *md = EVP_sha384(); 495 break; 496 case SSL_GOST89MAC: 497 *md = EVP_gost2814789imit(); 498 break; 499 case SSL_GOST94: 500 *md = EVP_gostr341194(); 501 break; 502 case SSL_STREEBOG256: 503 *md = EVP_streebog256(); 504 break; 505 } 506 507 if (*enc == NULL || *md == NULL) 508 return 0; 509 510 /* 511 * EVP_CIPH_FLAG_AEAD_CIPHER and EVP_CIPH_GCM_MODE ciphers are not 512 * supported via EVP_CIPHER (they should be using EVP_AEAD instead). 513 */ 514 if (EVP_CIPHER_flags(*enc) & EVP_CIPH_FLAG_AEAD_CIPHER) 515 return 0; 516 if (EVP_CIPHER_mode(*enc) == EVP_CIPH_GCM_MODE) 517 return 0; 518 519 if (ss->cipher->algorithm_mac == SSL_GOST89MAC) { 520 *mac_pkey_type = EVP_PKEY_GOSTIMIT; 521 *mac_secret_size = 32; /* XXX */ 522 } else { 523 *mac_pkey_type = EVP_PKEY_HMAC; 524 *mac_secret_size = EVP_MD_size(*md); 525 } 526 527 return 1; 528 } 529 530 /* 531 * ssl_cipher_get_evp_aead sets aead to point to the correct EVP_AEAD object 532 * for s->cipher. It returns 1 on success and 0 on error. 533 */ 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 (s->s3->hs.cipher == NULL) 568 return 0; 569 570 handshake_mac = s->s3->hs.cipher->algorithm2 & 571 SSL_HANDSHAKE_MAC_MASK; 572 573 /* For TLSv1.2 we upgrade the default MD5+SHA1 MAC to SHA256. */ 574 if (SSL_USE_SHA256_PRF(s) && handshake_mac == SSL_HANDSHAKE_MAC_DEFAULT) 575 handshake_mac = SSL_HANDSHAKE_MAC_SHA256; 576 577 switch (handshake_mac) { 578 case SSL_HANDSHAKE_MAC_DEFAULT: 579 *md = EVP_md5_sha1(); 580 return 1; 581 case SSL_HANDSHAKE_MAC_GOST94: 582 *md = EVP_gostr341194(); 583 return 1; 584 case SSL_HANDSHAKE_MAC_SHA256: 585 *md = EVP_sha256(); 586 return 1; 587 case SSL_HANDSHAKE_MAC_SHA384: 588 *md = EVP_sha384(); 589 return 1; 590 case SSL_HANDSHAKE_MAC_STREEBOG256: 591 *md = EVP_streebog256(); 592 return 1; 593 default: 594 break; 595 } 596 597 return 0; 598 } 599 600 #define ITEM_SEP(a) \ 601 (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ',')) 602 603 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 /* 685 * Drop any invalid ciphers and any which use unavailable 686 * algorithms. 687 */ 688 if ((c != NULL) && c->valid && 689 !(c->algorithm_mkey & disabled_mkey) && 690 !(c->algorithm_auth & disabled_auth) && 691 !(c->algorithm_enc & disabled_enc) && 692 !(c->algorithm_mac & disabled_mac) && 693 !(c->algorithm_ssl & disabled_ssl)) { 694 co_list[co_list_num].cipher = c; 695 co_list[co_list_num].next = NULL; 696 co_list[co_list_num].prev = NULL; 697 co_list[co_list_num].active = 0; 698 co_list_num++; 699 /* 700 if (!sk_push(ca_list,(char *)c)) goto err; 701 */ 702 } 703 } 704 705 /* 706 * Prepare linked list from list entries 707 */ 708 if (co_list_num > 0) { 709 co_list[0].prev = NULL; 710 711 if (co_list_num > 1) { 712 co_list[0].next = &co_list[1]; 713 714 for (i = 1; i < co_list_num - 1; i++) { 715 co_list[i].prev = &co_list[i - 1]; 716 co_list[i].next = &co_list[i + 1]; 717 } 718 719 co_list[co_list_num - 1].prev = 720 &co_list[co_list_num - 2]; 721 } 722 723 co_list[co_list_num - 1].next = NULL; 724 725 *head_p = &co_list[0]; 726 *tail_p = &co_list[co_list_num - 1]; 727 } 728 } 729 730 static void 731 ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list, int num_of_group_aliases, 732 unsigned long disabled_mkey, unsigned long disabled_auth, 733 unsigned long disabled_enc, unsigned long disabled_mac, 734 unsigned long disabled_ssl, CIPHER_ORDER *head) 735 { 736 CIPHER_ORDER *ciph_curr; 737 const SSL_CIPHER **ca_curr; 738 int i; 739 unsigned long mask_mkey = ~disabled_mkey; 740 unsigned long mask_auth = ~disabled_auth; 741 unsigned long mask_enc = ~disabled_enc; 742 unsigned long mask_mac = ~disabled_mac; 743 unsigned long mask_ssl = ~disabled_ssl; 744 745 /* 746 * First, add the real ciphers as already collected 747 */ 748 ciph_curr = head; 749 ca_curr = ca_list; 750 while (ciph_curr != NULL) { 751 *ca_curr = ciph_curr->cipher; 752 ca_curr++; 753 ciph_curr = ciph_curr->next; 754 } 755 756 /* 757 * Now we add the available ones from the cipher_aliases[] table. 758 * They represent either one or more algorithms, some of which 759 * in any affected category must be supported (set in enabled_mask), 760 * or represent a cipher strength value (will be added in any case because algorithms=0). 761 */ 762 for (i = 0; i < num_of_group_aliases; i++) { 763 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey; 764 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth; 765 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc; 766 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac; 767 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl; 768 769 if (algorithm_mkey) 770 if ((algorithm_mkey & mask_mkey) == 0) 771 continue; 772 773 if (algorithm_auth) 774 if ((algorithm_auth & mask_auth) == 0) 775 continue; 776 777 if (algorithm_enc) 778 if ((algorithm_enc & mask_enc) == 0) 779 continue; 780 781 if (algorithm_mac) 782 if ((algorithm_mac & mask_mac) == 0) 783 continue; 784 785 if (algorithm_ssl) 786 if ((algorithm_ssl & mask_ssl) == 0) 787 continue; 788 789 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i); 790 ca_curr++; 791 } 792 793 *ca_curr = NULL; /* end of list */ 794 } 795 796 static void 797 ssl_cipher_apply_rule(unsigned long cipher_id, unsigned long alg_mkey, 798 unsigned long alg_auth, unsigned long alg_enc, unsigned long alg_mac, 799 unsigned long alg_ssl, unsigned long algo_strength, int rule, 800 int strength_bits, CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 801 { 802 CIPHER_ORDER *head, *tail, *curr, *next, *last; 803 const SSL_CIPHER *cp; 804 int reverse = 0; 805 806 if (rule == CIPHER_DEL) 807 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */ 808 809 head = *head_p; 810 tail = *tail_p; 811 812 if (reverse) { 813 next = tail; 814 last = head; 815 } else { 816 next = head; 817 last = tail; 818 } 819 820 curr = NULL; 821 for (;;) { 822 if (curr == last) 823 break; 824 curr = next; 825 next = reverse ? curr->prev : curr->next; 826 827 cp = curr->cipher; 828 829 if (cipher_id && cp->id != cipher_id) 830 continue; 831 832 /* 833 * Selection criteria is either the value of strength_bits 834 * or the algorithms used. 835 */ 836 if (strength_bits >= 0) { 837 if (strength_bits != cp->strength_bits) 838 continue; 839 } else { 840 if (alg_mkey && !(alg_mkey & cp->algorithm_mkey)) 841 continue; 842 if (alg_auth && !(alg_auth & cp->algorithm_auth)) 843 continue; 844 if (alg_enc && !(alg_enc & cp->algorithm_enc)) 845 continue; 846 if (alg_mac && !(alg_mac & cp->algorithm_mac)) 847 continue; 848 if (alg_ssl && !(alg_ssl & cp->algorithm_ssl)) 849 continue; 850 if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength)) 851 continue; 852 } 853 854 /* add the cipher if it has not been added yet. */ 855 if (rule == CIPHER_ADD) { 856 /* reverse == 0 */ 857 if (!curr->active) { 858 ll_append_tail(&head, curr, &tail); 859 curr->active = 1; 860 } 861 } 862 /* Move the added cipher to this location */ 863 else if (rule == CIPHER_ORD) { 864 /* reverse == 0 */ 865 if (curr->active) { 866 ll_append_tail(&head, curr, &tail); 867 } 868 } else if (rule == CIPHER_DEL) { 869 /* reverse == 1 */ 870 if (curr->active) { 871 /* most recently deleted ciphersuites get best positions 872 * for any future CIPHER_ADD (note that the CIPHER_DEL loop 873 * works in reverse to maintain the order) */ 874 ll_append_head(&head, curr, &tail); 875 curr->active = 0; 876 } 877 } else if (rule == CIPHER_KILL) { 878 /* reverse == 0 */ 879 if (head == curr) 880 head = curr->next; 881 else 882 curr->prev->next = curr->next; 883 if (tail == curr) 884 tail = curr->prev; 885 curr->active = 0; 886 if (curr->next != NULL) 887 curr->next->prev = curr->prev; 888 if (curr->prev != NULL) 889 curr->prev->next = curr->next; 890 curr->next = NULL; 891 curr->prev = NULL; 892 } 893 } 894 895 *head_p = head; 896 *tail_p = tail; 897 } 898 899 static int 900 ssl_cipher_strength_sort(CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 901 { 902 int max_strength_bits, i, *number_uses; 903 CIPHER_ORDER *curr; 904 905 /* 906 * This routine sorts the ciphers with descending strength. The sorting 907 * must keep the pre-sorted sequence, so we apply the normal sorting 908 * routine as '+' movement to the end of the list. 909 */ 910 max_strength_bits = 0; 911 curr = *head_p; 912 while (curr != NULL) { 913 if (curr->active && 914 (curr->cipher->strength_bits > max_strength_bits)) 915 max_strength_bits = curr->cipher->strength_bits; 916 curr = curr->next; 917 } 918 919 number_uses = calloc((max_strength_bits + 1), sizeof(int)); 920 if (!number_uses) { 921 SSLerrorx(ERR_R_MALLOC_FAILURE); 922 return (0); 923 } 924 925 /* 926 * Now find the strength_bits values actually used 927 */ 928 curr = *head_p; 929 while (curr != NULL) { 930 if (curr->active) 931 number_uses[curr->cipher->strength_bits]++; 932 curr = curr->next; 933 } 934 /* 935 * Go through the list of used strength_bits values in descending 936 * order. 937 */ 938 for (i = max_strength_bits; i >= 0; i--) 939 if (number_uses[i] > 0) 940 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p); 941 942 free(number_uses); 943 return (1); 944 } 945 946 static int 947 ssl_cipher_process_rulestr(const char *rule_str, CIPHER_ORDER **head_p, 948 CIPHER_ORDER **tail_p, const SSL_CIPHER **ca_list, SSL_CERT *cert, 949 int *tls13_seen) 950 { 951 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl; 952 unsigned long algo_strength; 953 int j, multi, found, rule, retval, ok, buflen; 954 unsigned long cipher_id = 0; 955 const char *l, *buf; 956 char ch; 957 958 *tls13_seen = 0; 959 960 retval = 1; 961 l = rule_str; 962 for (;;) { 963 ch = *l; 964 965 if (ch == '\0') 966 break; 967 968 if (ch == '-') { 969 rule = CIPHER_DEL; 970 l++; 971 } else if (ch == '+') { 972 rule = CIPHER_ORD; 973 l++; 974 } else if (ch == '!') { 975 rule = CIPHER_KILL; 976 l++; 977 } else if (ch == '@') { 978 rule = CIPHER_SPECIAL; 979 l++; 980 } else { 981 rule = CIPHER_ADD; 982 } 983 984 if (ITEM_SEP(ch)) { 985 l++; 986 continue; 987 } 988 989 alg_mkey = 0; 990 alg_auth = 0; 991 alg_enc = 0; 992 alg_mac = 0; 993 alg_ssl = 0; 994 algo_strength = 0; 995 996 for (;;) { 997 ch = *l; 998 buf = l; 999 buflen = 0; 1000 while (((ch >= 'A') && (ch <= 'Z')) || 1001 ((ch >= '0') && (ch <= '9')) || 1002 ((ch >= 'a') && (ch <= 'z')) || 1003 (ch == '-') || (ch == '.') || 1004 (ch == '_') || (ch == '=')) { 1005 ch = *(++l); 1006 buflen++; 1007 } 1008 1009 if (buflen == 0) { 1010 /* 1011 * We hit something we cannot deal with, 1012 * it is no command or separator nor 1013 * alphanumeric, so we call this an error. 1014 */ 1015 SSLerrorx(SSL_R_INVALID_COMMAND); 1016 retval = found = 0; 1017 l++; 1018 break; 1019 } 1020 1021 if (rule == CIPHER_SPECIAL) { 1022 /* unused -- avoid compiler warning */ 1023 found = 0; 1024 /* special treatment */ 1025 break; 1026 } 1027 1028 /* check for multi-part specification */ 1029 if (ch == '+') { 1030 multi = 1; 1031 l++; 1032 } else 1033 multi = 0; 1034 1035 /* 1036 * Now search for the cipher alias in the ca_list. 1037 * Be careful with the strncmp, because the "buflen" 1038 * limitation will make the rule "ADH:SOME" and the 1039 * cipher "ADH-MY-CIPHER" look like a match for 1040 * buflen=3. So additionally check whether the cipher 1041 * name found has the correct length. We can save a 1042 * strlen() call: just checking for the '\0' at the 1043 * right place is sufficient, we have to strncmp() 1044 * anyway (we cannot use strcmp(), because buf is not 1045 * '\0' terminated.) 1046 */ 1047 j = found = 0; 1048 cipher_id = 0; 1049 while (ca_list[j]) { 1050 if (!strncmp(buf, ca_list[j]->name, buflen) && 1051 (ca_list[j]->name[buflen] == '\0')) { 1052 found = 1; 1053 break; 1054 } else 1055 j++; 1056 } 1057 1058 if (!found) 1059 break; /* ignore this entry */ 1060 1061 if (ca_list[j]->algorithm_mkey) { 1062 if (alg_mkey) { 1063 alg_mkey &= ca_list[j]->algorithm_mkey; 1064 if (!alg_mkey) { 1065 found = 0; 1066 break; 1067 } 1068 } else 1069 alg_mkey = ca_list[j]->algorithm_mkey; 1070 } 1071 1072 if (ca_list[j]->algorithm_auth) { 1073 if (alg_auth) { 1074 alg_auth &= ca_list[j]->algorithm_auth; 1075 if (!alg_auth) { 1076 found = 0; 1077 break; 1078 } 1079 } else 1080 alg_auth = ca_list[j]->algorithm_auth; 1081 } 1082 1083 if (ca_list[j]->algorithm_enc) { 1084 if (alg_enc) { 1085 alg_enc &= ca_list[j]->algorithm_enc; 1086 if (!alg_enc) { 1087 found = 0; 1088 break; 1089 } 1090 } else 1091 alg_enc = ca_list[j]->algorithm_enc; 1092 } 1093 1094 if (ca_list[j]->algorithm_mac) { 1095 if (alg_mac) { 1096 alg_mac &= ca_list[j]->algorithm_mac; 1097 if (!alg_mac) { 1098 found = 0; 1099 break; 1100 } 1101 } else 1102 alg_mac = ca_list[j]->algorithm_mac; 1103 } 1104 1105 if (ca_list[j]->algo_strength & SSL_STRONG_MASK) { 1106 if (algo_strength & SSL_STRONG_MASK) { 1107 algo_strength &= 1108 (ca_list[j]->algo_strength & 1109 SSL_STRONG_MASK) | ~SSL_STRONG_MASK; 1110 if (!(algo_strength & 1111 SSL_STRONG_MASK)) { 1112 found = 0; 1113 break; 1114 } 1115 } else 1116 algo_strength |= 1117 ca_list[j]->algo_strength & 1118 SSL_STRONG_MASK; 1119 } 1120 1121 if (ca_list[j]->valid) { 1122 /* 1123 * explicit ciphersuite found; its protocol 1124 * version does not become part of the search 1125 * pattern! 1126 */ 1127 cipher_id = ca_list[j]->id; 1128 if (ca_list[j]->algorithm_ssl == SSL_TLSV1_3) 1129 *tls13_seen = 1; 1130 } else { 1131 /* 1132 * not an explicit ciphersuite; only in this 1133 * case, the protocol version is considered 1134 * part of the search pattern 1135 */ 1136 if (ca_list[j]->algorithm_ssl) { 1137 if (alg_ssl) { 1138 alg_ssl &= 1139 ca_list[j]->algorithm_ssl; 1140 if (!alg_ssl) { 1141 found = 0; 1142 break; 1143 } 1144 } else 1145 alg_ssl = 1146 ca_list[j]->algorithm_ssl; 1147 } 1148 } 1149 1150 if (!multi) 1151 break; 1152 } 1153 1154 /* 1155 * Ok, we have the rule, now apply it 1156 */ 1157 if (rule == CIPHER_SPECIAL) { 1158 /* special command */ 1159 ok = 0; 1160 if (buflen == 8 && strncmp(buf, "STRENGTH", 8) == 0) { 1161 ok = ssl_cipher_strength_sort(head_p, tail_p); 1162 } else if (buflen == 10 && 1163 strncmp(buf, "SECLEVEL=", 9) == 0) { 1164 int level = buf[9] - '0'; 1165 1166 if (level >= 0 && level <= 5) { 1167 cert->security_level = level; 1168 ok = 1; 1169 } else { 1170 SSLerrorx(SSL_R_INVALID_COMMAND); 1171 } 1172 } else { 1173 SSLerrorx(SSL_R_INVALID_COMMAND); 1174 } 1175 if (ok == 0) 1176 retval = 0; 1177 1178 while ((*l != '\0') && !ITEM_SEP(*l)) 1179 l++; 1180 } else if (found) { 1181 if (alg_ssl == SSL_TLSV1_3) 1182 *tls13_seen = 1; 1183 ssl_cipher_apply_rule(cipher_id, alg_mkey, alg_auth, 1184 alg_enc, alg_mac, alg_ssl, algo_strength, rule, 1185 -1, head_p, tail_p); 1186 } else { 1187 while ((*l != '\0') && !ITEM_SEP(*l)) 1188 l++; 1189 } 1190 if (*l == '\0') 1191 break; /* done */ 1192 } 1193 1194 return (retval); 1195 } 1196 1197 static inline int 1198 ssl_aes_is_accelerated(void) 1199 { 1200 #if defined(__i386__) || defined(__x86_64__) 1201 return ((OPENSSL_cpu_caps() & (1ULL << 57)) != 0); 1202 #else 1203 return (0); 1204 #endif 1205 } 1206 1207 STACK_OF(SSL_CIPHER) * 1208 ssl_create_cipher_list(const SSL_METHOD *ssl_method, 1209 STACK_OF(SSL_CIPHER) **cipher_list, 1210 STACK_OF(SSL_CIPHER) *cipher_list_tls13, 1211 const char *rule_str, SSL_CERT *cert) 1212 { 1213 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases; 1214 unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl; 1215 STACK_OF(SSL_CIPHER) *cipherstack; 1216 const char *rule_p; 1217 CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr; 1218 const SSL_CIPHER **ca_list = NULL; 1219 const SSL_CIPHER *cipher; 1220 int tls13_seen = 0; 1221 int any_active; 1222 int i; 1223 1224 /* 1225 * Return with error if nothing to do. 1226 */ 1227 if (rule_str == NULL || cipher_list == NULL) 1228 return NULL; 1229 1230 /* 1231 * To reduce the work to do we only want to process the compiled 1232 * in algorithms, so we first get the mask of disabled ciphers. 1233 */ 1234 ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl); 1235 1236 /* 1237 * Now we have to collect the available ciphers from the compiled 1238 * in ciphers. We cannot get more than the number compiled in, so 1239 * it is used for allocation. 1240 */ 1241 num_of_ciphers = ssl3_num_ciphers(); 1242 co_list = reallocarray(NULL, num_of_ciphers, sizeof(CIPHER_ORDER)); 1243 if (co_list == NULL) { 1244 SSLerrorx(ERR_R_MALLOC_FAILURE); 1245 return(NULL); /* Failure */ 1246 } 1247 1248 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, 1249 disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl, 1250 co_list, &head, &tail); 1251 1252 1253 /* Now arrange all ciphers by preference: */ 1254 1255 /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */ 1256 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1257 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail); 1258 1259 if (ssl_aes_is_accelerated()) { 1260 /* 1261 * We have hardware assisted AES - prefer AES as a symmetric 1262 * cipher, with CHACHA20 second. 1263 */ 1264 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, 1265 CIPHER_ADD, -1, &head, &tail); 1266 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305, 1267 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1268 } else { 1269 /* 1270 * CHACHA20 is fast and safe on all hardware and is thus our 1271 * preferred symmetric cipher, with AES second. 1272 */ 1273 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305, 1274 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1275 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, 1276 CIPHER_ADD, -1, &head, &tail); 1277 } 1278 1279 /* Temporarily enable everything else for sorting */ 1280 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1281 1282 /* Low priority for MD5 */ 1283 ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail); 1284 1285 /* Move anonymous ciphers to the end. Usually, these will remain disabled. 1286 * (For applications that allow them, they aren't too bad, but we prefer 1287 * authenticated ciphers.) */ 1288 ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1289 1290 /* Move ciphers without forward secrecy to the end */ 1291 ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1292 1293 /* RC4 is sort of broken - move it to the end */ 1294 ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1295 1296 /* Now sort by symmetric encryption strength. The above ordering remains 1297 * in force within each class */ 1298 if (!ssl_cipher_strength_sort(&head, &tail)) { 1299 free(co_list); 1300 return NULL; 1301 } 1302 1303 /* Now disable everything (maintaining the ordering!) */ 1304 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail); 1305 1306 /* TLSv1.3 first. */ 1307 ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_ADD, -1, &head, &tail); 1308 ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_DEL, -1, &head, &tail); 1309 1310 /* 1311 * We also need cipher aliases for selecting based on the rule_str. 1312 * There might be two types of entries in the rule_str: 1) names 1313 * of ciphers themselves 2) aliases for groups of ciphers. 1314 * For 1) we need the available ciphers and for 2) the cipher 1315 * groups of cipher_aliases added together in one list (otherwise 1316 * we would be happy with just the cipher_aliases table). 1317 */ 1318 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER); 1319 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1; 1320 ca_list = reallocarray(NULL, num_of_alias_max, sizeof(SSL_CIPHER *)); 1321 if (ca_list == NULL) { 1322 free(co_list); 1323 SSLerrorx(ERR_R_MALLOC_FAILURE); 1324 return(NULL); /* Failure */ 1325 } 1326 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mkey, 1327 disabled_auth, disabled_enc, disabled_mac, disabled_ssl, head); 1328 1329 /* 1330 * If the rule_string begins with DEFAULT, apply the default rule 1331 * before using the (possibly available) additional rules. 1332 */ 1333 ok = 1; 1334 rule_p = rule_str; 1335 if (strncmp(rule_str, "DEFAULT", 7) == 0) { 1336 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST, 1337 &head, &tail, ca_list, cert, &tls13_seen); 1338 rule_p += 7; 1339 if (*rule_p == ':') 1340 rule_p++; 1341 } 1342 1343 if (ok && (strlen(rule_p) > 0)) 1344 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list, 1345 cert, &tls13_seen); 1346 1347 free((void *)ca_list); /* Not needed anymore */ 1348 1349 if (!ok) { 1350 /* Rule processing failure */ 1351 free(co_list); 1352 return (NULL); 1353 } 1354 1355 /* 1356 * Allocate new "cipherstack" for the result, return with error 1357 * if we cannot get one. 1358 */ 1359 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) { 1360 free(co_list); 1361 return (NULL); 1362 } 1363 1364 /* Prefer TLSv1.3 cipher suites. */ 1365 if (cipher_list_tls13 != NULL) { 1366 for (i = 0; i < sk_SSL_CIPHER_num(cipher_list_tls13); i++) { 1367 cipher = sk_SSL_CIPHER_value(cipher_list_tls13, i); 1368 sk_SSL_CIPHER_push(cipherstack, cipher); 1369 } 1370 tls13_seen = 1; 1371 } 1372 1373 /* 1374 * The cipher selection for the list is done. The ciphers are added 1375 * to the resulting precedence to the STACK_OF(SSL_CIPHER). 1376 * 1377 * If the rule string did not contain any references to TLSv1.3 and 1378 * TLSv1.3 cipher suites have not been configured separately, 1379 * include inactive TLSv1.3 cipher suites. This avoids attempts to 1380 * use TLSv1.3 with an older rule string that does not include 1381 * TLSv1.3 cipher suites. If the rule string resulted in no active 1382 * cipher suites then we return an empty stack. 1383 */ 1384 any_active = 0; 1385 for (curr = head; curr != NULL; curr = curr->next) { 1386 if (curr->active || 1387 (!tls13_seen && curr->cipher->algorithm_ssl == SSL_TLSV1_3)) 1388 sk_SSL_CIPHER_push(cipherstack, curr->cipher); 1389 any_active |= curr->active; 1390 } 1391 if (!any_active) 1392 sk_SSL_CIPHER_zero(cipherstack); 1393 1394 free(co_list); /* Not needed any longer */ 1395 1396 sk_SSL_CIPHER_free(*cipher_list); 1397 *cipher_list = cipherstack; 1398 1399 return (cipherstack); 1400 } 1401 1402 const SSL_CIPHER * 1403 SSL_CIPHER_get_by_id(unsigned int id) 1404 { 1405 return ssl3_get_cipher_by_id(id); 1406 } 1407 1408 const SSL_CIPHER * 1409 SSL_CIPHER_get_by_value(uint16_t value) 1410 { 1411 return ssl3_get_cipher_by_value(value); 1412 } 1413 1414 char * 1415 SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len) 1416 { 1417 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, alg2; 1418 const char *ver, *kx, *au, *enc, *mac; 1419 char *ret; 1420 int l; 1421 1422 alg_mkey = cipher->algorithm_mkey; 1423 alg_auth = cipher->algorithm_auth; 1424 alg_enc = cipher->algorithm_enc; 1425 alg_mac = cipher->algorithm_mac; 1426 alg_ssl = cipher->algorithm_ssl; 1427 1428 alg2 = cipher->algorithm2; 1429 1430 if (alg_ssl & SSL_SSLV3) 1431 ver = "SSLv3"; 1432 else if (alg_ssl & SSL_TLSV1_2) 1433 ver = "TLSv1.2"; 1434 else if (alg_ssl & SSL_TLSV1_3) 1435 ver = "TLSv1.3"; 1436 else 1437 ver = "unknown"; 1438 1439 switch (alg_mkey) { 1440 case SSL_kRSA: 1441 kx = "RSA"; 1442 break; 1443 case SSL_kDHE: 1444 kx = "DH"; 1445 break; 1446 case SSL_kECDHE: 1447 kx = "ECDH"; 1448 break; 1449 case SSL_kGOST: 1450 kx = "GOST"; 1451 break; 1452 case SSL_kTLS1_3: 1453 kx = "TLSv1.3"; 1454 break; 1455 default: 1456 kx = "unknown"; 1457 } 1458 1459 switch (alg_auth) { 1460 case SSL_aRSA: 1461 au = "RSA"; 1462 break; 1463 case SSL_aDSS: 1464 au = "DSS"; 1465 break; 1466 case SSL_aNULL: 1467 au = "None"; 1468 break; 1469 case SSL_aECDSA: 1470 au = "ECDSA"; 1471 break; 1472 case SSL_aGOST01: 1473 au = "GOST01"; 1474 break; 1475 case SSL_aTLS1_3: 1476 au = "TLSv1.3"; 1477 break; 1478 default: 1479 au = "unknown"; 1480 break; 1481 } 1482 1483 switch (alg_enc) { 1484 case SSL_3DES: 1485 enc = "3DES(168)"; 1486 break; 1487 case SSL_RC4: 1488 enc = alg2 & SSL2_CF_8_BYTE_ENC ? "RC4(64)" : "RC4(128)"; 1489 break; 1490 case SSL_eNULL: 1491 enc = "None"; 1492 break; 1493 case SSL_AES128: 1494 enc = "AES(128)"; 1495 break; 1496 case SSL_AES256: 1497 enc = "AES(256)"; 1498 break; 1499 case SSL_AES128GCM: 1500 enc = "AESGCM(128)"; 1501 break; 1502 case SSL_AES256GCM: 1503 enc = "AESGCM(256)"; 1504 break; 1505 case SSL_CAMELLIA128: 1506 enc = "Camellia(128)"; 1507 break; 1508 case SSL_CAMELLIA256: 1509 enc = "Camellia(256)"; 1510 break; 1511 case SSL_CHACHA20POLY1305: 1512 enc = "ChaCha20-Poly1305"; 1513 break; 1514 case SSL_eGOST2814789CNT: 1515 enc = "GOST-28178-89-CNT"; 1516 break; 1517 default: 1518 enc = "unknown"; 1519 break; 1520 } 1521 1522 switch (alg_mac) { 1523 case SSL_MD5: 1524 mac = "MD5"; 1525 break; 1526 case SSL_SHA1: 1527 mac = "SHA1"; 1528 break; 1529 case SSL_SHA256: 1530 mac = "SHA256"; 1531 break; 1532 case SSL_SHA384: 1533 mac = "SHA384"; 1534 break; 1535 case SSL_AEAD: 1536 mac = "AEAD"; 1537 break; 1538 case SSL_GOST94: 1539 mac = "GOST94"; 1540 break; 1541 case SSL_GOST89MAC: 1542 mac = "GOST89IMIT"; 1543 break; 1544 case SSL_STREEBOG256: 1545 mac = "STREEBOG256"; 1546 break; 1547 default: 1548 mac = "unknown"; 1549 break; 1550 } 1551 1552 if (asprintf(&ret, "%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s\n", 1553 cipher->name, ver, kx, au, enc, mac) == -1) 1554 return "OPENSSL_malloc Error"; 1555 1556 if (buf != NULL) { 1557 l = strlcpy(buf, ret, len); 1558 free(ret); 1559 ret = buf; 1560 if (l >= len) 1561 ret = "Buffer too small"; 1562 } 1563 1564 return (ret); 1565 } 1566 1567 const char * 1568 SSL_CIPHER_get_version(const SSL_CIPHER *c) 1569 { 1570 if (c == NULL) 1571 return("(NONE)"); 1572 if ((c->id >> 24) == 3) 1573 return("TLSv1/SSLv3"); 1574 else 1575 return("unknown"); 1576 } 1577 1578 /* return the actual cipher being used */ 1579 const char * 1580 SSL_CIPHER_get_name(const SSL_CIPHER *c) 1581 { 1582 if (c != NULL) 1583 return (c->name); 1584 return("(NONE)"); 1585 } 1586 1587 /* number of bits for symmetric cipher */ 1588 int 1589 SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits) 1590 { 1591 int ret = 0; 1592 1593 if (c != NULL) { 1594 if (alg_bits != NULL) 1595 *alg_bits = c->alg_bits; 1596 ret = c->strength_bits; 1597 } 1598 return (ret); 1599 } 1600 1601 unsigned long 1602 SSL_CIPHER_get_id(const SSL_CIPHER *c) 1603 { 1604 return c->id; 1605 } 1606 1607 uint16_t 1608 SSL_CIPHER_get_value(const SSL_CIPHER *c) 1609 { 1610 return ssl3_cipher_get_value(c); 1611 } 1612 1613 const SSL_CIPHER * 1614 SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr) 1615 { 1616 uint16_t cipher_value; 1617 CBS cbs; 1618 1619 /* This API is documented with ptr being an array of length two. */ 1620 CBS_init(&cbs, ptr, 2); 1621 if (!CBS_get_u16(&cbs, &cipher_value)) 1622 return NULL; 1623 1624 return ssl3_get_cipher_by_value(cipher_value); 1625 } 1626 1627 int 1628 SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c) 1629 { 1630 switch (c->algorithm_enc) { 1631 case SSL_eNULL: 1632 return NID_undef; 1633 case SSL_3DES: 1634 return NID_des_ede3_cbc; 1635 case SSL_AES128: 1636 return NID_aes_128_cbc; 1637 case SSL_AES128GCM: 1638 return NID_aes_128_gcm; 1639 case SSL_AES256: 1640 return NID_aes_256_cbc; 1641 case SSL_AES256GCM: 1642 return NID_aes_256_gcm; 1643 case SSL_CAMELLIA128: 1644 return NID_camellia_128_cbc; 1645 case SSL_CAMELLIA256: 1646 return NID_camellia_256_cbc; 1647 case SSL_CHACHA20POLY1305: 1648 return NID_chacha20_poly1305; 1649 case SSL_DES: 1650 return NID_des_cbc; 1651 case SSL_RC4: 1652 return NID_rc4; 1653 case SSL_eGOST2814789CNT: 1654 return NID_gost89_cnt; 1655 default: 1656 return NID_undef; 1657 } 1658 } 1659 1660 int 1661 SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c) 1662 { 1663 switch (c->algorithm_mac) { 1664 case SSL_AEAD: 1665 return NID_undef; 1666 case SSL_GOST89MAC: 1667 return NID_id_Gost28147_89_MAC; 1668 case SSL_GOST94: 1669 return NID_id_GostR3411_94; 1670 case SSL_MD5: 1671 return NID_md5; 1672 case SSL_SHA1: 1673 return NID_sha1; 1674 case SSL_SHA256: 1675 return NID_sha256; 1676 case SSL_SHA384: 1677 return NID_sha384; 1678 case SSL_STREEBOG256: 1679 return NID_id_tc26_gost3411_2012_256; 1680 default: 1681 return NID_undef; 1682 } 1683 } 1684 1685 int 1686 SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c) 1687 { 1688 switch (c->algorithm_mkey) { 1689 case SSL_kDHE: 1690 return NID_kx_dhe; 1691 case SSL_kECDHE: 1692 return NID_kx_ecdhe; 1693 case SSL_kGOST: 1694 return NID_kx_gost; 1695 case SSL_kRSA: 1696 return NID_kx_rsa; 1697 default: 1698 return NID_undef; 1699 } 1700 } 1701 1702 int 1703 SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c) 1704 { 1705 switch (c->algorithm_auth) { 1706 case SSL_aNULL: 1707 return NID_auth_null; 1708 case SSL_aECDSA: 1709 return NID_auth_ecdsa; 1710 case SSL_aGOST01: 1711 return NID_auth_gost01; 1712 case SSL_aRSA: 1713 return NID_auth_rsa; 1714 default: 1715 return NID_undef; 1716 } 1717 } 1718 1719 int 1720 SSL_CIPHER_is_aead(const SSL_CIPHER *c) 1721 { 1722 return (c->algorithm_mac & SSL_AEAD) == SSL_AEAD; 1723 } 1724 1725 void * 1726 SSL_COMP_get_compression_methods(void) 1727 { 1728 return NULL; 1729 } 1730 1731 int 1732 SSL_COMP_add_compression_method(int id, void *cm) 1733 { 1734 return 1; 1735 } 1736 1737 const char * 1738 SSL_COMP_get_name(const void *comp) 1739 { 1740 return NULL; 1741 } 1742