1 /* $OpenBSD: ssl_ciph.c,v 1.142 2024/05/09 07:55:48 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/evp.h> 146 #include <openssl/objects.h> 147 #include <openssl/opensslconf.h> 148 149 #include "ssl_local.h" 150 151 #define CIPHER_ADD 1 152 #define CIPHER_KILL 2 153 #define CIPHER_DEL 3 154 #define CIPHER_ORD 4 155 #define CIPHER_SPECIAL 5 156 157 typedef struct cipher_order_st { 158 const SSL_CIPHER *cipher; 159 int active; 160 int dead; 161 struct cipher_order_st *next, *prev; 162 } CIPHER_ORDER; 163 164 static const SSL_CIPHER cipher_aliases[] = { 165 166 /* "ALL" doesn't include eNULL (must be specifically enabled) */ 167 { 168 .name = SSL_TXT_ALL, 169 .algorithm_enc = ~SSL_eNULL, 170 }, 171 172 /* "COMPLEMENTOFALL" */ 173 { 174 .name = SSL_TXT_CMPALL, 175 .algorithm_enc = SSL_eNULL, 176 }, 177 178 /* 179 * "COMPLEMENTOFDEFAULT" 180 * (does *not* include ciphersuites not found in ALL!) 181 */ 182 { 183 .name = SSL_TXT_CMPDEF, 184 .algorithm_mkey = SSL_kDHE|SSL_kECDHE, 185 .algorithm_auth = SSL_aNULL, 186 .algorithm_enc = ~SSL_eNULL, 187 }, 188 189 /* 190 * key exchange aliases 191 * (some of those using only a single bit here combine multiple key 192 * exchange algs according to the RFCs, e.g. kEDH combines DHE_DSS 193 * and DHE_RSA) 194 */ 195 { 196 .name = SSL_TXT_kRSA, 197 .algorithm_mkey = SSL_kRSA, 198 }, 199 { 200 .name = SSL_TXT_kEDH, 201 .algorithm_mkey = SSL_kDHE, 202 }, 203 { 204 .name = SSL_TXT_DH, 205 .algorithm_mkey = SSL_kDHE, 206 }, 207 { 208 .name = SSL_TXT_kEECDH, 209 .algorithm_mkey = SSL_kECDHE, 210 }, 211 { 212 .name = SSL_TXT_ECDH, 213 .algorithm_mkey = SSL_kECDHE, 214 }, 215 216 /* server authentication aliases */ 217 { 218 .name = SSL_TXT_aRSA, 219 .algorithm_auth = SSL_aRSA, 220 }, 221 { 222 .name = SSL_TXT_aDSS, 223 .algorithm_auth = SSL_aDSS, 224 }, 225 { 226 .name = SSL_TXT_DSS, 227 .algorithm_auth = SSL_aDSS, 228 }, 229 { 230 .name = SSL_TXT_aNULL, 231 .algorithm_auth = SSL_aNULL, 232 }, 233 { 234 .name = SSL_TXT_aECDSA, 235 .algorithm_auth = SSL_aECDSA, 236 }, 237 { 238 .name = SSL_TXT_ECDSA, 239 .algorithm_auth = SSL_aECDSA, 240 }, 241 242 /* aliases combining key exchange and server authentication */ 243 { 244 .name = SSL_TXT_DHE, 245 .algorithm_mkey = SSL_kDHE, 246 .algorithm_auth = ~SSL_aNULL, 247 }, 248 { 249 .name = SSL_TXT_EDH, 250 .algorithm_mkey = SSL_kDHE, 251 .algorithm_auth = ~SSL_aNULL, 252 }, 253 { 254 .name = SSL_TXT_ECDHE, 255 .algorithm_mkey = SSL_kECDHE, 256 .algorithm_auth = ~SSL_aNULL, 257 }, 258 { 259 .name = SSL_TXT_EECDH, 260 .algorithm_mkey = SSL_kECDHE, 261 .algorithm_auth = ~SSL_aNULL, 262 }, 263 { 264 .name = SSL_TXT_NULL, 265 .algorithm_enc = SSL_eNULL, 266 }, 267 { 268 .name = SSL_TXT_RSA, 269 .algorithm_mkey = SSL_kRSA, 270 .algorithm_auth = SSL_aRSA, 271 }, 272 { 273 .name = SSL_TXT_ADH, 274 .algorithm_mkey = SSL_kDHE, 275 .algorithm_auth = SSL_aNULL, 276 }, 277 { 278 .name = SSL_TXT_AECDH, 279 .algorithm_mkey = SSL_kECDHE, 280 .algorithm_auth = SSL_aNULL, 281 }, 282 283 /* symmetric encryption aliases */ 284 { 285 .name = SSL_TXT_3DES, 286 .algorithm_enc = SSL_3DES, 287 }, 288 { 289 .name = SSL_TXT_RC4, 290 .algorithm_enc = SSL_RC4, 291 }, 292 { 293 .name = SSL_TXT_eNULL, 294 .algorithm_enc = SSL_eNULL, 295 }, 296 { 297 .name = SSL_TXT_AES128, 298 .algorithm_enc = SSL_AES128|SSL_AES128GCM, 299 }, 300 { 301 .name = SSL_TXT_AES256, 302 .algorithm_enc = SSL_AES256|SSL_AES256GCM, 303 }, 304 { 305 .name = SSL_TXT_AES, 306 .algorithm_enc = SSL_AES, 307 }, 308 { 309 .name = SSL_TXT_AES_GCM, 310 .algorithm_enc = SSL_AES128GCM|SSL_AES256GCM, 311 }, 312 { 313 .name = SSL_TXT_CAMELLIA128, 314 .algorithm_enc = SSL_CAMELLIA128, 315 }, 316 { 317 .name = SSL_TXT_CAMELLIA256, 318 .algorithm_enc = SSL_CAMELLIA256, 319 }, 320 { 321 .name = SSL_TXT_CAMELLIA, 322 .algorithm_enc = SSL_CAMELLIA128|SSL_CAMELLIA256, 323 }, 324 { 325 .name = SSL_TXT_CHACHA20, 326 .algorithm_enc = SSL_CHACHA20POLY1305, 327 }, 328 329 /* MAC aliases */ 330 { 331 .name = SSL_TXT_AEAD, 332 .algorithm_mac = SSL_AEAD, 333 }, 334 { 335 .name = SSL_TXT_MD5, 336 .algorithm_mac = SSL_MD5, 337 }, 338 { 339 .name = SSL_TXT_SHA1, 340 .algorithm_mac = SSL_SHA1, 341 }, 342 { 343 .name = SSL_TXT_SHA, 344 .algorithm_mac = SSL_SHA1, 345 }, 346 { 347 .name = SSL_TXT_SHA256, 348 .algorithm_mac = SSL_SHA256, 349 }, 350 { 351 .name = SSL_TXT_SHA384, 352 .algorithm_mac = SSL_SHA384, 353 }, 354 355 /* protocol version aliases */ 356 { 357 .name = SSL_TXT_SSLV3, 358 .algorithm_ssl = SSL_SSLV3, 359 }, 360 { 361 .name = SSL_TXT_TLSV1, 362 .algorithm_ssl = SSL_TLSV1, 363 }, 364 { 365 .name = SSL_TXT_TLSV1_2, 366 .algorithm_ssl = SSL_TLSV1_2, 367 }, 368 { 369 .name = SSL_TXT_TLSV1_3, 370 .algorithm_ssl = SSL_TLSV1_3, 371 }, 372 373 /* cipher suite aliases */ 374 #ifdef LIBRESSL_HAS_TLS1_3 375 { 376 .valid = 1, 377 .name = "TLS_AES_128_GCM_SHA256", 378 .id = TLS1_3_CK_AES_128_GCM_SHA256, 379 .algorithm_ssl = SSL_TLSV1_3, 380 }, 381 { 382 .valid = 1, 383 .name = "TLS_AES_256_GCM_SHA384", 384 .id = TLS1_3_CK_AES_256_GCM_SHA384, 385 .algorithm_ssl = SSL_TLSV1_3, 386 }, 387 { 388 .valid = 1, 389 .name = "TLS_CHACHA20_POLY1305_SHA256", 390 .id = TLS1_3_CK_CHACHA20_POLY1305_SHA256, 391 .algorithm_ssl = SSL_TLSV1_3, 392 }, 393 #endif 394 395 /* strength classes */ 396 { 397 .name = SSL_TXT_LOW, 398 .algo_strength = SSL_LOW, 399 }, 400 { 401 .name = SSL_TXT_MEDIUM, 402 .algo_strength = SSL_MEDIUM, 403 }, 404 { 405 .name = SSL_TXT_HIGH, 406 .algo_strength = SSL_HIGH, 407 }, 408 }; 409 410 int 411 ssl_cipher_get_evp(const SSL_SESSION *ss, const EVP_CIPHER **enc, 412 const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size) 413 { 414 *enc = NULL; 415 *md = NULL; 416 *mac_pkey_type = NID_undef; 417 *mac_secret_size = 0; 418 419 if (ss->cipher == NULL) 420 return 0; 421 422 /* 423 * This function does not handle EVP_AEAD. 424 * See ssl_cipher_get_evp_aead instead. 425 */ 426 if (ss->cipher->algorithm_mac & SSL_AEAD) 427 return 0; 428 429 switch (ss->cipher->algorithm_enc) { 430 case SSL_3DES: 431 *enc = EVP_des_ede3_cbc(); 432 break; 433 case SSL_RC4: 434 *enc = EVP_rc4(); 435 break; 436 case SSL_eNULL: 437 *enc = EVP_enc_null(); 438 break; 439 case SSL_AES128: 440 *enc = EVP_aes_128_cbc(); 441 break; 442 case SSL_AES256: 443 *enc = EVP_aes_256_cbc(); 444 break; 445 case SSL_CAMELLIA128: 446 *enc = EVP_camellia_128_cbc(); 447 break; 448 case SSL_CAMELLIA256: 449 *enc = EVP_camellia_256_cbc(); 450 break; 451 } 452 453 switch (ss->cipher->algorithm_mac) { 454 case SSL_MD5: 455 *md = EVP_md5(); 456 break; 457 case SSL_SHA1: 458 *md = EVP_sha1(); 459 break; 460 case SSL_SHA256: 461 *md = EVP_sha256(); 462 break; 463 case SSL_SHA384: 464 *md = EVP_sha384(); 465 break; 466 } 467 if (*enc == NULL || *md == NULL) 468 return 0; 469 470 /* XXX remove these from ssl_cipher_get_evp? */ 471 /* 472 * EVP_CIPH_FLAG_AEAD_CIPHER and EVP_CIPH_GCM_MODE ciphers are not 473 * supported via EVP_CIPHER (they should be using EVP_AEAD instead). 474 */ 475 if (EVP_CIPHER_flags(*enc) & EVP_CIPH_FLAG_AEAD_CIPHER) 476 return 0; 477 if (EVP_CIPHER_mode(*enc) == EVP_CIPH_GCM_MODE) 478 return 0; 479 480 *mac_pkey_type = EVP_PKEY_HMAC; 481 *mac_secret_size = EVP_MD_size(*md); 482 return 1; 483 } 484 485 /* 486 * ssl_cipher_get_evp_aead sets aead to point to the correct EVP_AEAD object 487 * for s->cipher. It returns 1 on success and 0 on error. 488 */ 489 int 490 ssl_cipher_get_evp_aead(const SSL_SESSION *ss, const EVP_AEAD **aead) 491 { 492 *aead = NULL; 493 494 if (ss->cipher == NULL) 495 return 0; 496 if ((ss->cipher->algorithm_mac & SSL_AEAD) == 0) 497 return 0; 498 499 switch (ss->cipher->algorithm_enc) { 500 case SSL_AES128GCM: 501 *aead = EVP_aead_aes_128_gcm(); 502 return 1; 503 case SSL_AES256GCM: 504 *aead = EVP_aead_aes_256_gcm(); 505 return 1; 506 case SSL_CHACHA20POLY1305: 507 *aead = EVP_aead_chacha20_poly1305(); 508 return 1; 509 default: 510 break; 511 } 512 return 0; 513 } 514 515 int 516 ssl_get_handshake_evp_md(SSL *s, const EVP_MD **md) 517 { 518 unsigned long handshake_mac; 519 520 *md = NULL; 521 522 if (s->s3->hs.cipher == NULL) 523 return 0; 524 525 handshake_mac = s->s3->hs.cipher->algorithm2 & SSL_HANDSHAKE_MAC_MASK; 526 527 /* For TLSv1.2 we upgrade the default MD5+SHA1 MAC to SHA256. */ 528 if (SSL_USE_SHA256_PRF(s) && handshake_mac == SSL_HANDSHAKE_MAC_DEFAULT) 529 handshake_mac = SSL_HANDSHAKE_MAC_SHA256; 530 531 switch (handshake_mac) { 532 case SSL_HANDSHAKE_MAC_DEFAULT: 533 *md = EVP_md5_sha1(); 534 return 1; 535 case SSL_HANDSHAKE_MAC_SHA256: 536 *md = EVP_sha256(); 537 return 1; 538 case SSL_HANDSHAKE_MAC_SHA384: 539 *md = EVP_sha384(); 540 return 1; 541 default: 542 break; 543 } 544 545 return 0; 546 } 547 548 #define ITEM_SEP(a) \ 549 (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ',')) 550 551 static void 552 ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr, 553 CIPHER_ORDER **tail) 554 { 555 if (curr == *tail) 556 return; 557 if (curr == *head) 558 *head = curr->next; 559 if (curr->prev != NULL) 560 curr->prev->next = curr->next; 561 if (curr->next != NULL) 562 curr->next->prev = curr->prev; 563 (*tail)->next = curr; 564 curr->prev= *tail; 565 curr->next = NULL; 566 *tail = curr; 567 } 568 569 static void 570 ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr, 571 CIPHER_ORDER **tail) 572 { 573 if (curr == *head) 574 return; 575 if (curr == *tail) 576 *tail = curr->prev; 577 if (curr->next != NULL) 578 curr->next->prev = curr->prev; 579 if (curr->prev != NULL) 580 curr->prev->next = curr->next; 581 (*head)->prev = curr; 582 curr->next= *head; 583 curr->prev = NULL; 584 *head = curr; 585 } 586 587 /* XXX beck: remove this in a followon to removing GOST */ 588 static void 589 ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth, 590 unsigned long *enc, unsigned long *mac, unsigned long *ssl) 591 { 592 *mkey = 0; 593 *auth = 0; 594 *enc = 0; 595 *mac = 0; 596 *ssl = 0; 597 598 #ifdef SSL_FORBID_ENULL 599 *enc |= SSL_eNULL; 600 #endif 601 } 602 603 static void 604 ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method, int num_of_ciphers, 605 unsigned long disabled_mkey, unsigned long disabled_auth, 606 unsigned long disabled_enc, unsigned long disabled_mac, 607 unsigned long disabled_ssl, CIPHER_ORDER *co_list, 608 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 609 { 610 int i, co_list_num; 611 const SSL_CIPHER *c; 612 613 /* 614 * We have num_of_ciphers descriptions compiled in, depending on the 615 * method selected (SSLv3, TLSv1, etc). These will later be sorted in 616 * a linked list with at most num entries. 617 */ 618 619 /* Get the initial list of ciphers */ 620 co_list_num = 0; /* actual count of ciphers */ 621 for (i = 0; i < num_of_ciphers; i++) { 622 c = ssl_method->get_cipher(i); 623 /* 624 * Drop any invalid ciphers and any which use unavailable 625 * algorithms. 626 */ 627 if ((c != NULL) && c->valid && 628 !(c->algorithm_mkey & disabled_mkey) && 629 !(c->algorithm_auth & disabled_auth) && 630 !(c->algorithm_enc & disabled_enc) && 631 !(c->algorithm_mac & disabled_mac) && 632 !(c->algorithm_ssl & disabled_ssl)) { 633 co_list[co_list_num].cipher = c; 634 co_list[co_list_num].next = NULL; 635 co_list[co_list_num].prev = NULL; 636 co_list[co_list_num].active = 0; 637 co_list_num++; 638 } 639 } 640 641 /* 642 * Prepare linked list from list entries 643 */ 644 if (co_list_num > 0) { 645 co_list[0].prev = NULL; 646 647 if (co_list_num > 1) { 648 co_list[0].next = &co_list[1]; 649 650 for (i = 1; i < co_list_num - 1; i++) { 651 co_list[i].prev = &co_list[i - 1]; 652 co_list[i].next = &co_list[i + 1]; 653 } 654 655 co_list[co_list_num - 1].prev = 656 &co_list[co_list_num - 2]; 657 } 658 659 co_list[co_list_num - 1].next = NULL; 660 661 *head_p = &co_list[0]; 662 *tail_p = &co_list[co_list_num - 1]; 663 } 664 } 665 666 static void 667 ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list, int num_of_group_aliases, 668 unsigned long disabled_mkey, unsigned long disabled_auth, 669 unsigned long disabled_enc, unsigned long disabled_mac, 670 unsigned long disabled_ssl, CIPHER_ORDER *head) 671 { 672 CIPHER_ORDER *ciph_curr; 673 const SSL_CIPHER **ca_curr; 674 int i; 675 unsigned long mask_mkey = ~disabled_mkey; 676 unsigned long mask_auth = ~disabled_auth; 677 unsigned long mask_enc = ~disabled_enc; 678 unsigned long mask_mac = ~disabled_mac; 679 unsigned long mask_ssl = ~disabled_ssl; 680 681 /* 682 * First, add the real ciphers as already collected 683 */ 684 ciph_curr = head; 685 ca_curr = ca_list; 686 while (ciph_curr != NULL) { 687 *ca_curr = ciph_curr->cipher; 688 ca_curr++; 689 ciph_curr = ciph_curr->next; 690 } 691 692 /* 693 * Now we add the available ones from the cipher_aliases[] table. 694 * They represent either one or more algorithms, some of which 695 * in any affected category must be supported (set in enabled_mask), 696 * or represent a cipher strength value (will be added in any case because algorithms=0). 697 */ 698 for (i = 0; i < num_of_group_aliases; i++) { 699 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey; 700 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth; 701 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc; 702 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac; 703 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl; 704 705 if (algorithm_mkey) 706 if ((algorithm_mkey & mask_mkey) == 0) 707 continue; 708 709 if (algorithm_auth) 710 if ((algorithm_auth & mask_auth) == 0) 711 continue; 712 713 if (algorithm_enc) 714 if ((algorithm_enc & mask_enc) == 0) 715 continue; 716 717 if (algorithm_mac) 718 if ((algorithm_mac & mask_mac) == 0) 719 continue; 720 721 if (algorithm_ssl) 722 if ((algorithm_ssl & mask_ssl) == 0) 723 continue; 724 725 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i); 726 ca_curr++; 727 } 728 729 *ca_curr = NULL; /* end of list */ 730 } 731 732 static void 733 ssl_cipher_apply_rule(unsigned long cipher_id, unsigned long alg_mkey, 734 unsigned long alg_auth, unsigned long alg_enc, unsigned long alg_mac, 735 unsigned long alg_ssl, unsigned long algo_strength, int rule, 736 int strength_bits, CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 737 { 738 CIPHER_ORDER *head, *tail, *curr, *next, *last; 739 const SSL_CIPHER *cp; 740 int reverse = 0; 741 742 if (rule == CIPHER_DEL) 743 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */ 744 745 head = *head_p; 746 tail = *tail_p; 747 748 if (reverse) { 749 next = tail; 750 last = head; 751 } else { 752 next = head; 753 last = tail; 754 } 755 756 curr = NULL; 757 for (;;) { 758 if (curr == last) 759 break; 760 curr = next; 761 next = reverse ? curr->prev : curr->next; 762 763 cp = curr->cipher; 764 765 if (cipher_id && cp->id != cipher_id) 766 continue; 767 768 /* 769 * Selection criteria is either the value of strength_bits 770 * or the algorithms used. 771 */ 772 if (strength_bits >= 0) { 773 if (strength_bits != cp->strength_bits) 774 continue; 775 } else { 776 if (alg_mkey && !(alg_mkey & cp->algorithm_mkey)) 777 continue; 778 if (alg_auth && !(alg_auth & cp->algorithm_auth)) 779 continue; 780 if (alg_enc && !(alg_enc & cp->algorithm_enc)) 781 continue; 782 if (alg_mac && !(alg_mac & cp->algorithm_mac)) 783 continue; 784 if (alg_ssl && !(alg_ssl & cp->algorithm_ssl)) 785 continue; 786 if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength)) 787 continue; 788 } 789 790 /* add the cipher if it has not been added yet. */ 791 if (rule == CIPHER_ADD) { 792 /* reverse == 0 */ 793 if (!curr->active) { 794 ll_append_tail(&head, curr, &tail); 795 curr->active = 1; 796 } 797 } 798 /* Move the added cipher to this location */ 799 else if (rule == CIPHER_ORD) { 800 /* reverse == 0 */ 801 if (curr->active) { 802 ll_append_tail(&head, curr, &tail); 803 } 804 } else if (rule == CIPHER_DEL) { 805 /* reverse == 1 */ 806 if (curr->active) { 807 /* most recently deleted ciphersuites get best positions 808 * for any future CIPHER_ADD (note that the CIPHER_DEL loop 809 * works in reverse to maintain the order) */ 810 ll_append_head(&head, curr, &tail); 811 curr->active = 0; 812 } 813 } else if (rule == CIPHER_KILL) { 814 /* reverse == 0 */ 815 if (head == curr) 816 head = curr->next; 817 else 818 curr->prev->next = curr->next; 819 if (tail == curr) 820 tail = curr->prev; 821 curr->active = 0; 822 if (curr->next != NULL) 823 curr->next->prev = curr->prev; 824 if (curr->prev != NULL) 825 curr->prev->next = curr->next; 826 curr->next = NULL; 827 curr->prev = NULL; 828 } 829 } 830 831 *head_p = head; 832 *tail_p = tail; 833 } 834 835 static int 836 ssl_cipher_strength_sort(CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 837 { 838 int max_strength_bits, i, *number_uses; 839 CIPHER_ORDER *curr; 840 841 /* 842 * This routine sorts the ciphers with descending strength. The sorting 843 * must keep the pre-sorted sequence, so we apply the normal sorting 844 * routine as '+' movement to the end of the list. 845 */ 846 max_strength_bits = 0; 847 curr = *head_p; 848 while (curr != NULL) { 849 if (curr->active && 850 (curr->cipher->strength_bits > max_strength_bits)) 851 max_strength_bits = curr->cipher->strength_bits; 852 curr = curr->next; 853 } 854 855 number_uses = calloc((max_strength_bits + 1), sizeof(int)); 856 if (!number_uses) { 857 SSLerrorx(ERR_R_MALLOC_FAILURE); 858 return (0); 859 } 860 861 /* 862 * Now find the strength_bits values actually used 863 */ 864 curr = *head_p; 865 while (curr != NULL) { 866 if (curr->active) 867 number_uses[curr->cipher->strength_bits]++; 868 curr = curr->next; 869 } 870 /* 871 * Go through the list of used strength_bits values in descending 872 * order. 873 */ 874 for (i = max_strength_bits; i >= 0; i--) 875 if (number_uses[i] > 0) 876 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p); 877 878 free(number_uses); 879 return (1); 880 } 881 882 static int 883 ssl_cipher_process_rulestr(const char *rule_str, CIPHER_ORDER **head_p, 884 CIPHER_ORDER **tail_p, const SSL_CIPHER **ca_list, SSL_CERT *cert, 885 int *tls13_seen) 886 { 887 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl; 888 unsigned long algo_strength; 889 int j, multi, found, rule, retval, ok, buflen; 890 unsigned long cipher_id = 0; 891 const char *l, *buf; 892 char ch; 893 894 *tls13_seen = 0; 895 896 retval = 1; 897 l = rule_str; 898 for (;;) { 899 ch = *l; 900 901 if (ch == '\0') 902 break; 903 904 if (ch == '-') { 905 rule = CIPHER_DEL; 906 l++; 907 } else if (ch == '+') { 908 rule = CIPHER_ORD; 909 l++; 910 } else if (ch == '!') { 911 rule = CIPHER_KILL; 912 l++; 913 } else if (ch == '@') { 914 rule = CIPHER_SPECIAL; 915 l++; 916 } else { 917 rule = CIPHER_ADD; 918 } 919 920 if (ITEM_SEP(ch)) { 921 l++; 922 continue; 923 } 924 925 alg_mkey = 0; 926 alg_auth = 0; 927 alg_enc = 0; 928 alg_mac = 0; 929 alg_ssl = 0; 930 algo_strength = 0; 931 932 for (;;) { 933 ch = *l; 934 buf = l; 935 buflen = 0; 936 while (((ch >= 'A') && (ch <= 'Z')) || 937 ((ch >= '0') && (ch <= '9')) || 938 ((ch >= 'a') && (ch <= 'z')) || 939 (ch == '-') || (ch == '.') || 940 (ch == '_') || (ch == '=')) { 941 ch = *(++l); 942 buflen++; 943 } 944 945 if (buflen == 0) { 946 /* 947 * We hit something we cannot deal with, 948 * it is no command or separator nor 949 * alphanumeric, so we call this an error. 950 */ 951 SSLerrorx(SSL_R_INVALID_COMMAND); 952 return 0; 953 } 954 955 if (rule == CIPHER_SPECIAL) { 956 /* unused -- avoid compiler warning */ 957 found = 0; 958 /* special treatment */ 959 break; 960 } 961 962 /* check for multi-part specification */ 963 if (ch == '+') { 964 multi = 1; 965 l++; 966 } else 967 multi = 0; 968 969 /* 970 * Now search for the cipher alias in the ca_list. 971 * Be careful with the strncmp, because the "buflen" 972 * limitation will make the rule "ADH:SOME" and the 973 * cipher "ADH-MY-CIPHER" look like a match for 974 * buflen=3. So additionally check whether the cipher 975 * name found has the correct length. We can save a 976 * strlen() call: just checking for the '\0' at the 977 * right place is sufficient, we have to strncmp() 978 * anyway (we cannot use strcmp(), because buf is not 979 * '\0' terminated.) 980 */ 981 j = found = 0; 982 cipher_id = 0; 983 while (ca_list[j]) { 984 if (!strncmp(buf, ca_list[j]->name, buflen) && 985 (ca_list[j]->name[buflen] == '\0')) { 986 found = 1; 987 break; 988 } else 989 j++; 990 } 991 992 if (!found) 993 break; /* ignore this entry */ 994 995 if (ca_list[j]->algorithm_mkey) { 996 if (alg_mkey) { 997 alg_mkey &= ca_list[j]->algorithm_mkey; 998 if (!alg_mkey) { 999 found = 0; 1000 break; 1001 } 1002 } else 1003 alg_mkey = ca_list[j]->algorithm_mkey; 1004 } 1005 1006 if (ca_list[j]->algorithm_auth) { 1007 if (alg_auth) { 1008 alg_auth &= ca_list[j]->algorithm_auth; 1009 if (!alg_auth) { 1010 found = 0; 1011 break; 1012 } 1013 } else 1014 alg_auth = ca_list[j]->algorithm_auth; 1015 } 1016 1017 if (ca_list[j]->algorithm_enc) { 1018 if (alg_enc) { 1019 alg_enc &= ca_list[j]->algorithm_enc; 1020 if (!alg_enc) { 1021 found = 0; 1022 break; 1023 } 1024 } else 1025 alg_enc = ca_list[j]->algorithm_enc; 1026 } 1027 1028 if (ca_list[j]->algorithm_mac) { 1029 if (alg_mac) { 1030 alg_mac &= ca_list[j]->algorithm_mac; 1031 if (!alg_mac) { 1032 found = 0; 1033 break; 1034 } 1035 } else 1036 alg_mac = ca_list[j]->algorithm_mac; 1037 } 1038 1039 if (ca_list[j]->algo_strength & SSL_STRONG_MASK) { 1040 if (algo_strength & SSL_STRONG_MASK) { 1041 algo_strength &= 1042 (ca_list[j]->algo_strength & 1043 SSL_STRONG_MASK) | ~SSL_STRONG_MASK; 1044 if (!(algo_strength & 1045 SSL_STRONG_MASK)) { 1046 found = 0; 1047 break; 1048 } 1049 } else 1050 algo_strength |= 1051 ca_list[j]->algo_strength & 1052 SSL_STRONG_MASK; 1053 } 1054 1055 if (ca_list[j]->valid) { 1056 /* 1057 * explicit ciphersuite found; its protocol 1058 * version does not become part of the search 1059 * pattern! 1060 */ 1061 cipher_id = ca_list[j]->id; 1062 if (ca_list[j]->algorithm_ssl == SSL_TLSV1_3) 1063 *tls13_seen = 1; 1064 } else { 1065 /* 1066 * not an explicit ciphersuite; only in this 1067 * case, the protocol version is considered 1068 * part of the search pattern 1069 */ 1070 if (ca_list[j]->algorithm_ssl) { 1071 if (alg_ssl) { 1072 alg_ssl &= 1073 ca_list[j]->algorithm_ssl; 1074 if (!alg_ssl) { 1075 found = 0; 1076 break; 1077 } 1078 } else 1079 alg_ssl = 1080 ca_list[j]->algorithm_ssl; 1081 } 1082 } 1083 1084 if (!multi) 1085 break; 1086 } 1087 1088 /* 1089 * Ok, we have the rule, now apply it 1090 */ 1091 if (rule == CIPHER_SPECIAL) { 1092 /* special command */ 1093 ok = 0; 1094 if (buflen == 8 && strncmp(buf, "STRENGTH", 8) == 0) { 1095 ok = ssl_cipher_strength_sort(head_p, tail_p); 1096 } else if (buflen == 10 && 1097 strncmp(buf, "SECLEVEL=", 9) == 0) { 1098 int level = buf[9] - '0'; 1099 1100 if (level >= 0 && level <= 5) { 1101 cert->security_level = level; 1102 ok = 1; 1103 } else { 1104 SSLerrorx(SSL_R_INVALID_COMMAND); 1105 } 1106 } else { 1107 SSLerrorx(SSL_R_INVALID_COMMAND); 1108 } 1109 if (ok == 0) 1110 retval = 0; 1111 1112 while ((*l != '\0') && !ITEM_SEP(*l)) 1113 l++; 1114 } else if (found) { 1115 if (alg_ssl == SSL_TLSV1_3) 1116 *tls13_seen = 1; 1117 ssl_cipher_apply_rule(cipher_id, alg_mkey, alg_auth, 1118 alg_enc, alg_mac, alg_ssl, algo_strength, rule, 1119 -1, head_p, tail_p); 1120 } else { 1121 while ((*l != '\0') && !ITEM_SEP(*l)) 1122 l++; 1123 } 1124 if (*l == '\0') 1125 break; /* done */ 1126 } 1127 1128 return (retval); 1129 } 1130 1131 static inline int 1132 ssl_aes_is_accelerated(void) 1133 { 1134 #if defined(__i386__) || defined(__x86_64__) 1135 return ((OPENSSL_cpu_caps() & (1ULL << 57)) != 0); 1136 #else 1137 return (0); 1138 #endif 1139 } 1140 1141 STACK_OF(SSL_CIPHER) * 1142 ssl_create_cipher_list(const SSL_METHOD *ssl_method, 1143 STACK_OF(SSL_CIPHER) **cipher_list, 1144 STACK_OF(SSL_CIPHER) *cipher_list_tls13, 1145 const char *rule_str, SSL_CERT *cert) 1146 { 1147 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases; 1148 unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl; 1149 STACK_OF(SSL_CIPHER) *cipherstack = NULL, *ret = NULL; 1150 const char *rule_p; 1151 CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr; 1152 const SSL_CIPHER **ca_list = NULL; 1153 const SSL_CIPHER *cipher; 1154 int tls13_seen = 0; 1155 int any_active; 1156 int i; 1157 1158 /* 1159 * Return with error if nothing to do. 1160 */ 1161 if (rule_str == NULL || cipher_list == NULL) 1162 goto err; 1163 1164 /* 1165 * To reduce the work to do we only want to process the compiled 1166 * in algorithms, so we first get the mask of disabled ciphers. 1167 */ 1168 ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl); 1169 1170 /* 1171 * Now we have to collect the available ciphers from the compiled 1172 * in ciphers. We cannot get more than the number compiled in, so 1173 * it is used for allocation. 1174 */ 1175 num_of_ciphers = ssl3_num_ciphers(); 1176 co_list = reallocarray(NULL, num_of_ciphers, sizeof(CIPHER_ORDER)); 1177 if (co_list == NULL) { 1178 SSLerrorx(ERR_R_MALLOC_FAILURE); 1179 goto err; 1180 } 1181 1182 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, 1183 disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl, 1184 co_list, &head, &tail); 1185 1186 1187 /* Now arrange all ciphers by preference: */ 1188 1189 /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */ 1190 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1191 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail); 1192 1193 if (ssl_aes_is_accelerated()) { 1194 /* 1195 * We have hardware assisted AES - prefer AES as a symmetric 1196 * cipher, with CHACHA20 second. 1197 */ 1198 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, 1199 CIPHER_ADD, -1, &head, &tail); 1200 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305, 1201 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1202 } else { 1203 /* 1204 * CHACHA20 is fast and safe on all hardware and is thus our 1205 * preferred symmetric cipher, with AES second. 1206 */ 1207 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305, 1208 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1209 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, 1210 CIPHER_ADD, -1, &head, &tail); 1211 } 1212 1213 /* Temporarily enable everything else for sorting */ 1214 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1215 1216 /* Low priority for MD5 */ 1217 ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail); 1218 1219 /* Move anonymous ciphers to the end. Usually, these will remain disabled. 1220 * (For applications that allow them, they aren't too bad, but we prefer 1221 * authenticated ciphers.) */ 1222 ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1223 1224 /* Move ciphers without forward secrecy to the end */ 1225 ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1226 1227 /* RC4 is sort of broken - move it to the end */ 1228 ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1229 1230 /* Now sort by symmetric encryption strength. The above ordering remains 1231 * in force within each class */ 1232 if (!ssl_cipher_strength_sort(&head, &tail)) 1233 goto err; 1234 1235 /* Now disable everything (maintaining the ordering!) */ 1236 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail); 1237 1238 /* TLSv1.3 first. */ 1239 ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_ADD, -1, &head, &tail); 1240 ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_DEL, -1, &head, &tail); 1241 1242 /* 1243 * We also need cipher aliases for selecting based on the rule_str. 1244 * There might be two types of entries in the rule_str: 1) names 1245 * of ciphers themselves 2) aliases for groups of ciphers. 1246 * For 1) we need the available ciphers and for 2) the cipher 1247 * groups of cipher_aliases added together in one list (otherwise 1248 * we would be happy with just the cipher_aliases table). 1249 */ 1250 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER); 1251 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1; 1252 ca_list = reallocarray(NULL, num_of_alias_max, sizeof(SSL_CIPHER *)); 1253 if (ca_list == NULL) { 1254 SSLerrorx(ERR_R_MALLOC_FAILURE); 1255 goto err; 1256 } 1257 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mkey, 1258 disabled_auth, disabled_enc, disabled_mac, disabled_ssl, head); 1259 1260 /* 1261 * If the rule_string begins with DEFAULT, apply the default rule 1262 * before using the (possibly available) additional rules. 1263 */ 1264 ok = 1; 1265 rule_p = rule_str; 1266 if (strncmp(rule_str, "DEFAULT", 7) == 0) { 1267 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST, 1268 &head, &tail, ca_list, cert, &tls13_seen); 1269 rule_p += 7; 1270 if (*rule_p == ':') 1271 rule_p++; 1272 } 1273 1274 if (ok && (strlen(rule_p) > 0)) 1275 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list, 1276 cert, &tls13_seen); 1277 1278 if (!ok) { 1279 /* Rule processing failure */ 1280 goto err; 1281 } 1282 1283 /* 1284 * Allocate new "cipherstack" for the result, return with error 1285 * if we cannot get one. 1286 */ 1287 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) { 1288 SSLerrorx(ERR_R_MALLOC_FAILURE); 1289 goto err; 1290 } 1291 1292 /* Prefer TLSv1.3 cipher suites. */ 1293 if (cipher_list_tls13 != NULL) { 1294 for (i = 0; i < sk_SSL_CIPHER_num(cipher_list_tls13); i++) { 1295 cipher = sk_SSL_CIPHER_value(cipher_list_tls13, i); 1296 if (!sk_SSL_CIPHER_push(cipherstack, cipher)) { 1297 SSLerrorx(ERR_R_MALLOC_FAILURE); 1298 goto err; 1299 } 1300 } 1301 tls13_seen = 1; 1302 } 1303 1304 /* 1305 * The cipher selection for the list is done. The ciphers are added 1306 * to the resulting precedence to the STACK_OF(SSL_CIPHER). 1307 * 1308 * If the rule string did not contain any references to TLSv1.3 and 1309 * TLSv1.3 cipher suites have not been configured separately, 1310 * include inactive TLSv1.3 cipher suites. This avoids attempts to 1311 * use TLSv1.3 with an older rule string that does not include 1312 * TLSv1.3 cipher suites. If the rule string resulted in no active 1313 * cipher suites then we return an empty stack. 1314 */ 1315 any_active = 0; 1316 for (curr = head; curr != NULL; curr = curr->next) { 1317 if (curr->active || 1318 (!tls13_seen && curr->cipher->algorithm_ssl == SSL_TLSV1_3)) { 1319 if (!sk_SSL_CIPHER_push(cipherstack, curr->cipher)) { 1320 SSLerrorx(ERR_R_MALLOC_FAILURE); 1321 goto err; 1322 } 1323 } 1324 any_active |= curr->active; 1325 } 1326 if (!any_active) 1327 sk_SSL_CIPHER_zero(cipherstack); 1328 1329 sk_SSL_CIPHER_free(*cipher_list); 1330 *cipher_list = cipherstack; 1331 cipherstack = NULL; 1332 1333 ret = *cipher_list; 1334 1335 err: 1336 sk_SSL_CIPHER_free(cipherstack); 1337 free((void *)ca_list); 1338 free(co_list); 1339 1340 return ret; 1341 } 1342 1343 char * 1344 SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len) 1345 { 1346 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl; 1347 const char *ver, *kx, *au, *enc, *mac; 1348 char *ret; 1349 int l; 1350 1351 alg_mkey = cipher->algorithm_mkey; 1352 alg_auth = cipher->algorithm_auth; 1353 alg_enc = cipher->algorithm_enc; 1354 alg_mac = cipher->algorithm_mac; 1355 alg_ssl = cipher->algorithm_ssl; 1356 1357 if (alg_ssl & SSL_SSLV3) 1358 ver = "SSLv3"; 1359 else if (alg_ssl & SSL_TLSV1_2) 1360 ver = "TLSv1.2"; 1361 else if (alg_ssl & SSL_TLSV1_3) 1362 ver = "TLSv1.3"; 1363 else 1364 ver = "unknown"; 1365 1366 switch (alg_mkey) { 1367 case SSL_kRSA: 1368 kx = "RSA"; 1369 break; 1370 case SSL_kDHE: 1371 kx = "DH"; 1372 break; 1373 case SSL_kECDHE: 1374 kx = "ECDH"; 1375 break; 1376 case SSL_kTLS1_3: 1377 kx = "TLSv1.3"; 1378 break; 1379 default: 1380 kx = "unknown"; 1381 } 1382 1383 switch (alg_auth) { 1384 case SSL_aRSA: 1385 au = "RSA"; 1386 break; 1387 case SSL_aDSS: 1388 au = "DSS"; 1389 break; 1390 case SSL_aNULL: 1391 au = "None"; 1392 break; 1393 case SSL_aECDSA: 1394 au = "ECDSA"; 1395 break; 1396 case SSL_aTLS1_3: 1397 au = "TLSv1.3"; 1398 break; 1399 default: 1400 au = "unknown"; 1401 break; 1402 } 1403 1404 switch (alg_enc) { 1405 case SSL_3DES: 1406 enc = "3DES(168)"; 1407 break; 1408 case SSL_RC4: 1409 enc = "RC4(128)"; 1410 break; 1411 case SSL_eNULL: 1412 enc = "None"; 1413 break; 1414 case SSL_AES128: 1415 enc = "AES(128)"; 1416 break; 1417 case SSL_AES256: 1418 enc = "AES(256)"; 1419 break; 1420 case SSL_AES128GCM: 1421 enc = "AESGCM(128)"; 1422 break; 1423 case SSL_AES256GCM: 1424 enc = "AESGCM(256)"; 1425 break; 1426 case SSL_CAMELLIA128: 1427 enc = "Camellia(128)"; 1428 break; 1429 case SSL_CAMELLIA256: 1430 enc = "Camellia(256)"; 1431 break; 1432 case SSL_CHACHA20POLY1305: 1433 enc = "ChaCha20-Poly1305"; 1434 break; 1435 default: 1436 enc = "unknown"; 1437 break; 1438 } 1439 1440 switch (alg_mac) { 1441 case SSL_MD5: 1442 mac = "MD5"; 1443 break; 1444 case SSL_SHA1: 1445 mac = "SHA1"; 1446 break; 1447 case SSL_SHA256: 1448 mac = "SHA256"; 1449 break; 1450 case SSL_SHA384: 1451 mac = "SHA384"; 1452 break; 1453 case SSL_AEAD: 1454 mac = "AEAD"; 1455 break; 1456 default: 1457 mac = "unknown"; 1458 break; 1459 } 1460 1461 if (asprintf(&ret, "%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s\n", 1462 cipher->name, ver, kx, au, enc, mac) == -1) 1463 return "OPENSSL_malloc Error"; 1464 1465 if (buf != NULL) { 1466 l = strlcpy(buf, ret, len); 1467 free(ret); 1468 ret = buf; 1469 if (l >= len) 1470 ret = "Buffer too small"; 1471 } 1472 1473 return (ret); 1474 } 1475 LSSL_ALIAS(SSL_CIPHER_description); 1476 1477 const char * 1478 SSL_CIPHER_get_version(const SSL_CIPHER *c) 1479 { 1480 if (c == NULL) 1481 return("(NONE)"); 1482 if ((c->id >> 24) == 3) 1483 return("TLSv1/SSLv3"); 1484 else 1485 return("unknown"); 1486 } 1487 LSSL_ALIAS(SSL_CIPHER_get_version); 1488 1489 /* return the actual cipher being used */ 1490 const char * 1491 SSL_CIPHER_get_name(const SSL_CIPHER *c) 1492 { 1493 if (c != NULL) 1494 return (c->name); 1495 return("(NONE)"); 1496 } 1497 LSSL_ALIAS(SSL_CIPHER_get_name); 1498 1499 /* number of bits for symmetric cipher */ 1500 int 1501 SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits) 1502 { 1503 int ret = 0; 1504 1505 if (c != NULL) { 1506 if (alg_bits != NULL) 1507 *alg_bits = c->alg_bits; 1508 ret = c->strength_bits; 1509 } 1510 return (ret); 1511 } 1512 LSSL_ALIAS(SSL_CIPHER_get_bits); 1513 1514 unsigned long 1515 SSL_CIPHER_get_id(const SSL_CIPHER *c) 1516 { 1517 return c->id; 1518 } 1519 LSSL_ALIAS(SSL_CIPHER_get_id); 1520 1521 uint16_t 1522 SSL_CIPHER_get_value(const SSL_CIPHER *c) 1523 { 1524 return ssl3_cipher_get_value(c); 1525 } 1526 LSSL_ALIAS(SSL_CIPHER_get_value); 1527 1528 const SSL_CIPHER * 1529 SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr) 1530 { 1531 uint16_t cipher_value; 1532 CBS cbs; 1533 1534 /* This API is documented with ptr being an array of length two. */ 1535 CBS_init(&cbs, ptr, 2); 1536 if (!CBS_get_u16(&cbs, &cipher_value)) 1537 return NULL; 1538 1539 return ssl3_get_cipher_by_value(cipher_value); 1540 } 1541 LSSL_ALIAS(SSL_CIPHER_find); 1542 1543 int 1544 SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c) 1545 { 1546 switch (c->algorithm_enc) { 1547 case SSL_eNULL: 1548 return NID_undef; 1549 case SSL_3DES: 1550 return NID_des_ede3_cbc; 1551 case SSL_AES128: 1552 return NID_aes_128_cbc; 1553 case SSL_AES128GCM: 1554 return NID_aes_128_gcm; 1555 case SSL_AES256: 1556 return NID_aes_256_cbc; 1557 case SSL_AES256GCM: 1558 return NID_aes_256_gcm; 1559 case SSL_CAMELLIA128: 1560 return NID_camellia_128_cbc; 1561 case SSL_CAMELLIA256: 1562 return NID_camellia_256_cbc; 1563 case SSL_CHACHA20POLY1305: 1564 return NID_chacha20_poly1305; 1565 case SSL_DES: 1566 return NID_des_cbc; 1567 case SSL_RC4: 1568 return NID_rc4; 1569 default: 1570 return NID_undef; 1571 } 1572 } 1573 LSSL_ALIAS(SSL_CIPHER_get_cipher_nid); 1574 1575 int 1576 SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c) 1577 { 1578 switch (c->algorithm_mac) { 1579 case SSL_AEAD: 1580 return NID_undef; 1581 case SSL_MD5: 1582 return NID_md5; 1583 case SSL_SHA1: 1584 return NID_sha1; 1585 case SSL_SHA256: 1586 return NID_sha256; 1587 case SSL_SHA384: 1588 return NID_sha384; 1589 default: 1590 return NID_undef; 1591 } 1592 } 1593 LSSL_ALIAS(SSL_CIPHER_get_digest_nid); 1594 1595 int 1596 SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c) 1597 { 1598 switch (c->algorithm_mkey) { 1599 case SSL_kDHE: 1600 return NID_kx_dhe; 1601 case SSL_kECDHE: 1602 return NID_kx_ecdhe; 1603 case SSL_kRSA: 1604 return NID_kx_rsa; 1605 default: 1606 return NID_undef; 1607 } 1608 } 1609 LSSL_ALIAS(SSL_CIPHER_get_kx_nid); 1610 1611 int 1612 SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c) 1613 { 1614 switch (c->algorithm_auth) { 1615 case SSL_aNULL: 1616 return NID_auth_null; 1617 case SSL_aECDSA: 1618 return NID_auth_ecdsa; 1619 case SSL_aRSA: 1620 return NID_auth_rsa; 1621 default: 1622 return NID_undef; 1623 } 1624 } 1625 LSSL_ALIAS(SSL_CIPHER_get_auth_nid); 1626 1627 int 1628 SSL_CIPHER_is_aead(const SSL_CIPHER *c) 1629 { 1630 return (c->algorithm_mac & SSL_AEAD) == SSL_AEAD; 1631 } 1632 LSSL_ALIAS(SSL_CIPHER_is_aead); 1633 1634 void * 1635 SSL_COMP_get_compression_methods(void) 1636 { 1637 return NULL; 1638 } 1639 LSSL_ALIAS(SSL_COMP_get_compression_methods); 1640 1641 int 1642 SSL_COMP_add_compression_method(int id, void *cm) 1643 { 1644 return 1; 1645 } 1646 LSSL_ALIAS(SSL_COMP_add_compression_method); 1647 1648 const char * 1649 SSL_COMP_get_name(const void *comp) 1650 { 1651 return NULL; 1652 } 1653 LSSL_ALIAS(SSL_COMP_get_name); 1654