1 /* $OpenBSD: ssl_ciph.c,v 1.74 2014/11/18 05:33:43 miod Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * ECC cipher suite support in OpenSSL originally developed by 114 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. 115 */ 116 /* ==================================================================== 117 * Copyright 2005 Nokia. All rights reserved. 118 * 119 * The portions of the attached software ("Contribution") is developed by 120 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 121 * license. 122 * 123 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 124 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 125 * support (see RFC 4279) to OpenSSL. 126 * 127 * No patent licenses or other rights except those expressly stated in 128 * the OpenSSL open source license shall be deemed granted or received 129 * expressly, by implication, estoppel, or otherwise. 130 * 131 * No assurances are provided by Nokia that the Contribution does not 132 * infringe the patent or other intellectual property rights of any third 133 * party or that the license provides you with all the necessary rights 134 * to make use of the Contribution. 135 * 136 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 137 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 138 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 139 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 140 * OTHERWISE. 141 */ 142 143 #include <stdio.h> 144 145 #include <openssl/objects.h> 146 147 #ifndef OPENSSL_NO_ENGINE 148 #include <openssl/engine.h> 149 #endif 150 151 #include "ssl_locl.h" 152 153 #define SSL_ENC_DES_IDX 0 154 #define SSL_ENC_3DES_IDX 1 155 #define SSL_ENC_RC4_IDX 2 156 #define SSL_ENC_IDEA_IDX 3 157 #define SSL_ENC_NULL_IDX 4 158 #define SSL_ENC_AES128_IDX 5 159 #define SSL_ENC_AES256_IDX 6 160 #define SSL_ENC_CAMELLIA128_IDX 7 161 #define SSL_ENC_CAMELLIA256_IDX 8 162 #define SSL_ENC_GOST89_IDX 9 163 #define SSL_ENC_AES128GCM_IDX 10 164 #define SSL_ENC_AES256GCM_IDX 11 165 #define SSL_ENC_NUM_IDX 12 166 167 168 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX] = { 169 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL 170 }; 171 172 #define SSL_MD_MD5_IDX 0 173 #define SSL_MD_SHA1_IDX 1 174 #define SSL_MD_GOST94_IDX 2 175 #define SSL_MD_GOST89MAC_IDX 3 176 #define SSL_MD_SHA256_IDX 4 177 #define SSL_MD_SHA384_IDX 5 178 #define SSL_MD_STREEBOG256_IDX 6 179 #define SSL_MD_STREEBOG512_IDX 7 180 /*Constant SSL_MAX_DIGEST equal to size of digests array should be 181 * defined in the 182 * ssl_locl.h */ 183 #define SSL_MD_NUM_IDX SSL_MAX_DIGEST 184 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX] = { 185 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL 186 }; 187 /* PKEY_TYPE for GOST89MAC is known in advance, but, because 188 * implementation is engine-provided, we'll fill it only if 189 * corresponding EVP_PKEY_METHOD is found 190 */ 191 static int ssl_mac_pkey_id[SSL_MD_NUM_IDX] = { 192 EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_GOSTIMIT, 193 EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_HMAC, 194 }; 195 196 static int ssl_mac_secret_size[SSL_MD_NUM_IDX] = { 197 0, 0, 0, 0, 0, 0, 0, 0 198 }; 199 200 static int ssl_handshake_digest_flag[SSL_MD_NUM_IDX] = { 201 SSL_HANDSHAKE_MAC_MD5, SSL_HANDSHAKE_MAC_SHA, 202 SSL_HANDSHAKE_MAC_GOST94, 0, SSL_HANDSHAKE_MAC_SHA256, 203 SSL_HANDSHAKE_MAC_SHA384, SSL_HANDSHAKE_MAC_STREEBOG256, 204 SSL_HANDSHAKE_MAC_STREEBOG512 205 }; 206 207 #define CIPHER_ADD 1 208 #define CIPHER_KILL 2 209 #define CIPHER_DEL 3 210 #define CIPHER_ORD 4 211 #define CIPHER_SPECIAL 5 212 213 typedef struct cipher_order_st { 214 const SSL_CIPHER *cipher; 215 int active; 216 int dead; 217 struct cipher_order_st *next, *prev; 218 } CIPHER_ORDER; 219 220 static const SSL_CIPHER cipher_aliases[] = { 221 222 /* "ALL" doesn't include eNULL (must be specifically enabled) */ 223 { 224 .name = SSL_TXT_ALL, 225 .algorithm_enc = ~SSL_eNULL, 226 }, 227 228 /* "COMPLEMENTOFALL" */ 229 { 230 .name = SSL_TXT_CMPALL, 231 .algorithm_enc = SSL_eNULL, 232 }, 233 234 /* 235 * "COMPLEMENTOFDEFAULT" 236 * (does *not* include ciphersuites not found in ALL!) 237 */ 238 { 239 .name = SSL_TXT_CMPDEF, 240 .algorithm_mkey = SSL_kDHE|SSL_kECDHE, 241 .algorithm_auth = SSL_aNULL, 242 .algorithm_enc = ~SSL_eNULL, 243 }, 244 245 /* 246 * key exchange aliases 247 * (some of those using only a single bit here combine multiple key 248 * exchange algs according to the RFCs, e.g. kEDH combines DHE_DSS 249 * and DHE_RSA) 250 */ 251 { 252 .name = SSL_TXT_kRSA, 253 .algorithm_mkey = SSL_kRSA, 254 }, 255 { 256 .name = SSL_TXT_kEDH, 257 .algorithm_mkey = SSL_kDHE, 258 }, 259 { 260 .name = SSL_TXT_DH, 261 .algorithm_mkey = SSL_kDHE, 262 }, 263 264 { 265 .name = SSL_TXT_kECDHr, 266 .algorithm_mkey = SSL_kECDHr, 267 }, 268 { 269 .name = SSL_TXT_kECDHe, 270 .algorithm_mkey = SSL_kECDHe, 271 }, 272 { 273 .name = SSL_TXT_kECDH, 274 .algorithm_mkey = SSL_kECDHr|SSL_kECDHe, 275 }, 276 { 277 .name = SSL_TXT_kEECDH, 278 .algorithm_mkey = SSL_kECDHE, 279 }, 280 { 281 .name = SSL_TXT_ECDH, 282 .algorithm_mkey = SSL_kECDHr|SSL_kECDHe|SSL_kECDHE, 283 }, 284 285 { 286 .name = SSL_TXT_kGOST, 287 .algorithm_mkey = SSL_kGOST, 288 }, 289 290 /* server authentication aliases */ 291 { 292 .name = SSL_TXT_aRSA, 293 .algorithm_auth = SSL_aRSA, 294 }, 295 { 296 .name = SSL_TXT_aDSS, 297 .algorithm_auth = SSL_aDSS, 298 }, 299 { 300 .name = SSL_TXT_DSS, 301 .algorithm_auth = SSL_aDSS, 302 }, 303 { 304 .name = SSL_TXT_aNULL, 305 .algorithm_auth = SSL_aNULL, 306 }, 307 { 308 .name = SSL_TXT_aECDH, 309 .algorithm_auth = SSL_aECDH, 310 }, 311 { 312 .name = SSL_TXT_aECDSA, 313 .algorithm_auth = SSL_aECDSA, 314 }, 315 { 316 .name = SSL_TXT_ECDSA, 317 .algorithm_auth = SSL_aECDSA, 318 }, 319 { 320 .name = SSL_TXT_aGOST94, 321 .algorithm_auth = SSL_aGOST94, 322 }, 323 { 324 .name = SSL_TXT_aGOST01, 325 .algorithm_auth = SSL_aGOST01, 326 }, 327 { 328 .name = SSL_TXT_aGOST, 329 .algorithm_auth = SSL_aGOST94|SSL_aGOST01, 330 }, 331 332 /* aliases combining key exchange and server authentication */ 333 { 334 .name = SSL_TXT_DHE, 335 .algorithm_mkey = SSL_kDHE, 336 .algorithm_auth = ~SSL_aNULL, 337 }, 338 { 339 .name = SSL_TXT_EDH, 340 .algorithm_mkey = SSL_kDHE, 341 .algorithm_auth = ~SSL_aNULL, 342 }, 343 { 344 .name = SSL_TXT_ECDHE, 345 .algorithm_mkey = SSL_kECDHE, 346 .algorithm_auth = ~SSL_aNULL, 347 }, 348 { 349 .name = SSL_TXT_EECDH, 350 .algorithm_mkey = SSL_kECDHE, 351 .algorithm_auth = ~SSL_aNULL, 352 }, 353 { 354 .name = SSL_TXT_NULL, 355 .algorithm_enc = SSL_eNULL, 356 }, 357 { 358 .name = SSL_TXT_RSA, 359 .algorithm_mkey = SSL_kRSA, 360 .algorithm_auth = SSL_aRSA, 361 }, 362 { 363 .name = SSL_TXT_ADH, 364 .algorithm_mkey = SSL_kDHE, 365 .algorithm_auth = SSL_aNULL, 366 }, 367 { 368 .name = SSL_TXT_AECDH, 369 .algorithm_mkey = SSL_kECDHE, 370 .algorithm_auth = SSL_aNULL, 371 }, 372 373 /* symmetric encryption aliases */ 374 { 375 .name = SSL_TXT_DES, 376 .algorithm_enc = SSL_DES, 377 }, 378 { 379 .name = SSL_TXT_3DES, 380 .algorithm_enc = SSL_3DES, 381 }, 382 { 383 .name = SSL_TXT_RC4, 384 .algorithm_enc = SSL_RC4, 385 }, 386 { 387 .name = SSL_TXT_IDEA, 388 .algorithm_enc = SSL_IDEA, 389 }, 390 { 391 .name = SSL_TXT_eNULL, 392 .algorithm_enc = SSL_eNULL, 393 }, 394 { 395 .name = SSL_TXT_AES128, 396 .algorithm_enc = SSL_AES128|SSL_AES128GCM, 397 }, 398 { 399 .name = SSL_TXT_AES256, 400 .algorithm_enc = SSL_AES256|SSL_AES256GCM, 401 }, 402 { 403 .name = SSL_TXT_AES, 404 .algorithm_enc = SSL_AES, 405 }, 406 { 407 .name = SSL_TXT_AES_GCM, 408 .algorithm_enc = SSL_AES128GCM|SSL_AES256GCM, 409 }, 410 { 411 .name = SSL_TXT_CAMELLIA128, 412 .algorithm_enc = SSL_CAMELLIA128, 413 }, 414 { 415 .name = SSL_TXT_CAMELLIA256, 416 .algorithm_enc = SSL_CAMELLIA256, 417 }, 418 { 419 .name = SSL_TXT_CAMELLIA, 420 .algorithm_enc = SSL_CAMELLIA128|SSL_CAMELLIA256, 421 }, 422 { 423 .name = SSL_TXT_CHACHA20, 424 .algorithm_enc = SSL_CHACHA20POLY1305, 425 }, 426 427 /* MAC aliases */ 428 { 429 .name = SSL_TXT_MD5, 430 .algorithm_mac = SSL_MD5, 431 }, 432 { 433 .name = SSL_TXT_SHA1, 434 .algorithm_mac = SSL_SHA1, 435 }, 436 { 437 .name = SSL_TXT_SHA, 438 .algorithm_mac = SSL_SHA1, 439 }, 440 { 441 .name = SSL_TXT_GOST94, 442 .algorithm_mac = SSL_GOST94, 443 }, 444 { 445 .name = SSL_TXT_GOST89MAC, 446 .algorithm_mac = SSL_GOST89MAC, 447 }, 448 { 449 .name = SSL_TXT_SHA256, 450 .algorithm_mac = SSL_SHA256, 451 }, 452 { 453 .name = SSL_TXT_SHA384, 454 .algorithm_mac = SSL_SHA384, 455 }, 456 { 457 .name = SSL_TXT_STREEBOG256, 458 .algorithm_mac = SSL_STREEBOG256, 459 }, 460 { 461 .name = SSL_TXT_STREEBOG512, 462 .algorithm_mac = SSL_STREEBOG512, 463 }, 464 465 /* protocol version aliases */ 466 { 467 .name = SSL_TXT_SSLV3, 468 .algorithm_ssl = SSL_SSLV3, 469 }, 470 { 471 .name = SSL_TXT_TLSV1, 472 .algorithm_ssl = SSL_TLSV1, 473 }, 474 { 475 .name = SSL_TXT_TLSV1_2, 476 .algorithm_ssl = SSL_TLSV1_2, 477 }, 478 479 /* strength classes */ 480 { 481 .name = SSL_TXT_LOW, 482 .algo_strength = SSL_LOW, 483 }, 484 { 485 .name = SSL_TXT_MEDIUM, 486 .algo_strength = SSL_MEDIUM, 487 }, 488 { 489 .name = SSL_TXT_HIGH, 490 .algo_strength = SSL_HIGH, 491 }, 492 }; 493 494 /* Search for public key algorithm with given name and 495 * return its pkey_id if it is available. Otherwise return 0 496 */ 497 #ifdef OPENSSL_NO_ENGINE 498 499 static int 500 get_optional_pkey_id(const char *pkey_name) 501 { 502 const EVP_PKEY_ASN1_METHOD *ameth; 503 int pkey_id = 0; 504 ameth = EVP_PKEY_asn1_find_str(NULL, pkey_name, -1); 505 if (ameth) { 506 EVP_PKEY_asn1_get0_info(&pkey_id, NULL, NULL, NULL, NULL, ameth); 507 } 508 return pkey_id; 509 } 510 511 #else 512 513 static int 514 get_optional_pkey_id(const char *pkey_name) 515 { 516 const EVP_PKEY_ASN1_METHOD *ameth; 517 ENGINE *tmpeng = NULL; 518 int pkey_id = 0; 519 ameth = EVP_PKEY_asn1_find_str(&tmpeng, pkey_name, -1); 520 if (ameth) { 521 EVP_PKEY_asn1_get0_info(&pkey_id, NULL, NULL, NULL, NULL, ameth); 522 } 523 if (tmpeng) 524 ENGINE_finish(tmpeng); 525 return pkey_id; 526 } 527 528 #endif 529 530 void 531 ssl_load_ciphers(void) 532 { 533 ssl_cipher_methods[SSL_ENC_DES_IDX]= 534 EVP_get_cipherbyname(SN_des_cbc); 535 ssl_cipher_methods[SSL_ENC_3DES_IDX]= 536 EVP_get_cipherbyname(SN_des_ede3_cbc); 537 ssl_cipher_methods[SSL_ENC_RC4_IDX]= 538 EVP_get_cipherbyname(SN_rc4); 539 #ifndef OPENSSL_NO_IDEA 540 ssl_cipher_methods[SSL_ENC_IDEA_IDX]= 541 EVP_get_cipherbyname(SN_idea_cbc); 542 #else 543 ssl_cipher_methods[SSL_ENC_IDEA_IDX] = NULL; 544 #endif 545 ssl_cipher_methods[SSL_ENC_AES128_IDX]= 546 EVP_get_cipherbyname(SN_aes_128_cbc); 547 ssl_cipher_methods[SSL_ENC_AES256_IDX]= 548 EVP_get_cipherbyname(SN_aes_256_cbc); 549 ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX]= 550 EVP_get_cipherbyname(SN_camellia_128_cbc); 551 ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX]= 552 EVP_get_cipherbyname(SN_camellia_256_cbc); 553 ssl_cipher_methods[SSL_ENC_GOST89_IDX]= 554 EVP_get_cipherbyname(SN_gost89_cnt); 555 556 ssl_cipher_methods[SSL_ENC_AES128GCM_IDX]= 557 EVP_get_cipherbyname(SN_aes_128_gcm); 558 ssl_cipher_methods[SSL_ENC_AES256GCM_IDX]= 559 EVP_get_cipherbyname(SN_aes_256_gcm); 560 561 ssl_digest_methods[SSL_MD_MD5_IDX]= 562 EVP_get_digestbyname(SN_md5); 563 ssl_mac_secret_size[SSL_MD_MD5_IDX]= 564 EVP_MD_size(ssl_digest_methods[SSL_MD_MD5_IDX]); 565 OPENSSL_assert(ssl_mac_secret_size[SSL_MD_MD5_IDX] >= 0); 566 ssl_digest_methods[SSL_MD_SHA1_IDX]= 567 EVP_get_digestbyname(SN_sha1); 568 ssl_mac_secret_size[SSL_MD_SHA1_IDX]= 569 EVP_MD_size(ssl_digest_methods[SSL_MD_SHA1_IDX]); 570 OPENSSL_assert(ssl_mac_secret_size[SSL_MD_SHA1_IDX] >= 0); 571 ssl_digest_methods[SSL_MD_GOST94_IDX]= 572 EVP_get_digestbyname(SN_id_GostR3411_94); 573 if (ssl_digest_methods[SSL_MD_GOST94_IDX]) { 574 ssl_mac_secret_size[SSL_MD_GOST94_IDX]= 575 EVP_MD_size(ssl_digest_methods[SSL_MD_GOST94_IDX]); 576 OPENSSL_assert(ssl_mac_secret_size[SSL_MD_GOST94_IDX] >= 0); 577 } 578 ssl_digest_methods[SSL_MD_GOST89MAC_IDX]= 579 EVP_get_digestbyname(SN_id_Gost28147_89_MAC); 580 if (ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX]) { 581 ssl_mac_secret_size[SSL_MD_GOST89MAC_IDX] = 32; 582 } 583 584 ssl_digest_methods[SSL_MD_SHA256_IDX]= 585 EVP_get_digestbyname(SN_sha256); 586 ssl_mac_secret_size[SSL_MD_SHA256_IDX]= 587 EVP_MD_size(ssl_digest_methods[SSL_MD_SHA256_IDX]); 588 ssl_digest_methods[SSL_MD_SHA384_IDX]= 589 EVP_get_digestbyname(SN_sha384); 590 ssl_mac_secret_size[SSL_MD_SHA384_IDX]= 591 EVP_MD_size(ssl_digest_methods[SSL_MD_SHA384_IDX]); 592 ssl_digest_methods[SSL_MD_STREEBOG256_IDX]= 593 EVP_get_digestbyname(SN_id_tc26_gost3411_2012_256); 594 ssl_mac_secret_size[SSL_MD_STREEBOG256_IDX]= 595 EVP_MD_size(ssl_digest_methods[SSL_MD_STREEBOG256_IDX]); 596 ssl_digest_methods[SSL_MD_STREEBOG512_IDX]= 597 EVP_get_digestbyname(SN_id_tc26_gost3411_2012_512); 598 ssl_mac_secret_size[SSL_MD_STREEBOG512_IDX]= 599 EVP_MD_size(ssl_digest_methods[SSL_MD_STREEBOG512_IDX]); 600 } 601 602 int 603 ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc, 604 const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size) 605 { 606 const SSL_CIPHER *c; 607 int i; 608 609 c = s->cipher; 610 if (c == NULL) 611 return (0); 612 613 /* 614 * This function does not handle EVP_AEAD. 615 * See ssl_cipher_get_aead_evp instead. 616 */ 617 if (c->algorithm2 & SSL_CIPHER_ALGORITHM2_AEAD) 618 return(0); 619 620 if ((enc == NULL) || (md == NULL)) 621 return (0); 622 623 switch (c->algorithm_enc) { 624 case SSL_DES: 625 i = SSL_ENC_DES_IDX; 626 break; 627 case SSL_3DES: 628 i = SSL_ENC_3DES_IDX; 629 break; 630 case SSL_RC4: 631 i = SSL_ENC_RC4_IDX; 632 break; 633 case SSL_IDEA: 634 i = SSL_ENC_IDEA_IDX; 635 break; 636 case SSL_eNULL: 637 i = SSL_ENC_NULL_IDX; 638 break; 639 case SSL_AES128: 640 i = SSL_ENC_AES128_IDX; 641 break; 642 case SSL_AES256: 643 i = SSL_ENC_AES256_IDX; 644 break; 645 case SSL_CAMELLIA128: 646 i = SSL_ENC_CAMELLIA128_IDX; 647 break; 648 case SSL_CAMELLIA256: 649 i = SSL_ENC_CAMELLIA256_IDX; 650 break; 651 case SSL_eGOST2814789CNT: 652 i = SSL_ENC_GOST89_IDX; 653 break; 654 case SSL_AES128GCM: 655 i = SSL_ENC_AES128GCM_IDX; 656 break; 657 case SSL_AES256GCM: 658 i = SSL_ENC_AES256GCM_IDX; 659 break; 660 default: 661 i = -1; 662 break; 663 } 664 665 if ((i < 0) || (i >= SSL_ENC_NUM_IDX)) 666 *enc = NULL; 667 else { 668 if (i == SSL_ENC_NULL_IDX) 669 *enc = EVP_enc_null(); 670 else 671 *enc = ssl_cipher_methods[i]; 672 } 673 674 switch (c->algorithm_mac) { 675 case SSL_MD5: 676 i = SSL_MD_MD5_IDX; 677 break; 678 case SSL_SHA1: 679 i = SSL_MD_SHA1_IDX; 680 break; 681 case SSL_SHA256: 682 i = SSL_MD_SHA256_IDX; 683 break; 684 case SSL_SHA384: 685 i = SSL_MD_SHA384_IDX; 686 break; 687 case SSL_GOST94: 688 i = SSL_MD_GOST94_IDX; 689 break; 690 case SSL_GOST89MAC: 691 i = SSL_MD_GOST89MAC_IDX; 692 break; 693 case SSL_STREEBOG256: 694 i = SSL_MD_STREEBOG256_IDX; 695 break; 696 case SSL_STREEBOG512: 697 i = SSL_MD_STREEBOG512_IDX; 698 break; 699 default: 700 i = -1; 701 break; 702 } 703 if ((i < 0) || (i >= SSL_MD_NUM_IDX)) { 704 *md = NULL; 705 706 if (mac_pkey_type != NULL) 707 *mac_pkey_type = NID_undef; 708 if (mac_secret_size != NULL) 709 *mac_secret_size = 0; 710 if (c->algorithm_mac == SSL_AEAD) 711 mac_pkey_type = NULL; 712 } else { 713 *md = ssl_digest_methods[i]; 714 if (mac_pkey_type != NULL) 715 *mac_pkey_type = ssl_mac_pkey_id[i]; 716 if (mac_secret_size != NULL) 717 *mac_secret_size = ssl_mac_secret_size[i]; 718 } 719 720 if ((*enc != NULL) && 721 (*md != NULL || (EVP_CIPHER_flags(*enc)&EVP_CIPH_FLAG_AEAD_CIPHER)) && 722 (!mac_pkey_type || *mac_pkey_type != NID_undef)) { 723 const EVP_CIPHER *evp; 724 725 if (s->ssl_version >> 8 != TLS1_VERSION_MAJOR || 726 s->ssl_version < TLS1_VERSION) 727 return 1; 728 729 if (c->algorithm_enc == SSL_RC4 && 730 c->algorithm_mac == SSL_MD5 && 731 (evp = EVP_get_cipherbyname("RC4-HMAC-MD5"))) 732 *enc = evp, *md = NULL; 733 else if (c->algorithm_enc == SSL_AES128 && 734 c->algorithm_mac == SSL_SHA1 && 735 (evp = EVP_get_cipherbyname("AES-128-CBC-HMAC-SHA1"))) 736 *enc = evp, *md = NULL; 737 else if (c->algorithm_enc == SSL_AES256 && 738 c->algorithm_mac == SSL_SHA1 && 739 (evp = EVP_get_cipherbyname("AES-256-CBC-HMAC-SHA1"))) 740 *enc = evp, *md = NULL; 741 return (1); 742 } else 743 return (0); 744 } 745 746 /* 747 * ssl_cipher_get_evp_aead sets aead to point to the correct EVP_AEAD object 748 * for s->cipher. It returns 1 on success and 0 on error. 749 */ 750 int 751 ssl_cipher_get_evp_aead(const SSL_SESSION *s, const EVP_AEAD **aead) 752 { 753 const SSL_CIPHER *c = s->cipher; 754 755 *aead = NULL; 756 757 if (c == NULL) 758 return 0; 759 if ((c->algorithm2 & SSL_CIPHER_ALGORITHM2_AEAD) == 0) 760 return 0; 761 762 switch (c->algorithm_enc) { 763 #ifndef OPENSSL_NO_AES 764 case SSL_AES128GCM: 765 *aead = EVP_aead_aes_128_gcm(); 766 return 1; 767 case SSL_AES256GCM: 768 *aead = EVP_aead_aes_256_gcm(); 769 return 1; 770 #endif 771 #if !defined(OPENSSL_NO_CHACHA) && !defined(OPENSSL_NO_POLY1305) 772 case SSL_CHACHA20POLY1305: 773 *aead = EVP_aead_chacha20_poly1305(); 774 return 1; 775 #endif 776 default: 777 break; 778 } 779 return 0; 780 } 781 782 int 783 ssl_get_handshake_digest(int idx, long *mask, const EVP_MD **md) 784 { 785 if (idx < 0 || idx >= SSL_MD_NUM_IDX) { 786 return 0; 787 } 788 *mask = ssl_handshake_digest_flag[idx]; 789 if (*mask) 790 *md = ssl_digest_methods[idx]; 791 else 792 *md = NULL; 793 return 1; 794 } 795 796 #define ITEM_SEP(a) \ 797 (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ',')) 798 799 static void 800 ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr, 801 CIPHER_ORDER **tail) 802 { 803 if (curr == *tail) 804 return; 805 if (curr == *head) 806 *head = curr->next; 807 if (curr->prev != NULL) 808 curr->prev->next = curr->next; 809 if (curr->next != NULL) 810 curr->next->prev = curr->prev; 811 (*tail)->next = curr; 812 curr->prev= *tail; 813 curr->next = NULL; 814 *tail = curr; 815 } 816 817 static void 818 ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr, 819 CIPHER_ORDER **tail) 820 { 821 if (curr == *head) 822 return; 823 if (curr == *tail) 824 *tail = curr->prev; 825 if (curr->next != NULL) 826 curr->next->prev = curr->prev; 827 if (curr->prev != NULL) 828 curr->prev->next = curr->next; 829 (*head)->prev = curr; 830 curr->next= *head; 831 curr->prev = NULL; 832 *head = curr; 833 } 834 835 static void 836 ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth, 837 unsigned long *enc, unsigned long *mac, unsigned long *ssl) 838 { 839 *mkey = 0; 840 *auth = 0; 841 *enc = 0; 842 *mac = 0; 843 *ssl = 0; 844 845 /* 846 * Check for presence of GOST 34.10 algorithms, and if they 847 * do not present, disable appropriate auth and key exchange. 848 */ 849 if (!get_optional_pkey_id("gost94")) { 850 *auth |= SSL_aGOST94; 851 } 852 if (!get_optional_pkey_id("gost2001")) { 853 *auth |= SSL_aGOST01; 854 } 855 /* Disable GOST key exchange if no GOST signature algs are available. */ 856 if (((~*auth) & (SSL_aGOST94|SSL_aGOST01)) == 0) { 857 *mkey |= SSL_kGOST; 858 } 859 #ifdef SSL_FORBID_ENULL 860 *enc |= SSL_eNULL; 861 #endif 862 863 *enc |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES : 0; 864 *enc |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES : 0; 865 *enc |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 : 0; 866 *enc |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA : 0; 867 *enc |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES128 : 0; 868 *enc |= (ssl_cipher_methods[SSL_ENC_AES256_IDX] == NULL) ? SSL_AES256 : 0; 869 *enc |= (ssl_cipher_methods[SSL_ENC_AES128GCM_IDX] == NULL) ? SSL_AES128GCM : 0; 870 *enc |= (ssl_cipher_methods[SSL_ENC_AES256GCM_IDX] == NULL) ? SSL_AES256GCM : 0; 871 *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] == NULL) ? SSL_CAMELLIA128 : 0; 872 *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] == NULL) ? SSL_CAMELLIA256 : 0; 873 *enc |= (ssl_cipher_methods[SSL_ENC_GOST89_IDX] == NULL) ? SSL_eGOST2814789CNT : 0; 874 875 *mac |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 : 0; 876 *mac |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1 : 0; 877 *mac |= (ssl_digest_methods[SSL_MD_SHA256_IDX] == NULL) ? SSL_SHA256 : 0; 878 *mac |= (ssl_digest_methods[SSL_MD_SHA384_IDX] == NULL) ? SSL_SHA384 : 0; 879 *mac |= (ssl_digest_methods[SSL_MD_GOST94_IDX] == NULL) ? SSL_GOST94 : 0; 880 *mac |= (ssl_digest_methods[SSL_MD_GOST89MAC_IDX] == NULL) ? SSL_GOST89MAC : 0; 881 *mac |= (ssl_digest_methods[SSL_MD_STREEBOG256_IDX] == NULL) ? SSL_STREEBOG256 : 0; 882 *mac |= (ssl_digest_methods[SSL_MD_STREEBOG512_IDX] == NULL) ? SSL_STREEBOG512 : 0; 883 884 } 885 886 static void 887 ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method, 888 int num_of_ciphers, 889 unsigned long disabled_mkey, unsigned long disabled_auth, 890 unsigned long disabled_enc, unsigned long disabled_mac, 891 unsigned long disabled_ssl, 892 CIPHER_ORDER *co_list, 893 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 894 { 895 int i, co_list_num; 896 const SSL_CIPHER *c; 897 898 /* 899 * We have num_of_ciphers descriptions compiled in, depending on the 900 * method selected (SSLv3, TLSv1, etc). These will later be sorted in 901 * a linked list with at most num entries. 902 */ 903 904 /* Get the initial list of ciphers */ 905 co_list_num = 0; /* actual count of ciphers */ 906 for (i = 0; i < num_of_ciphers; i++) { 907 c = ssl_method->get_cipher(i); 908 /* drop those that use any of that is not available */ 909 if ((c != NULL) && c->valid && 910 !(c->algorithm_mkey & disabled_mkey) && 911 !(c->algorithm_auth & disabled_auth) && 912 !(c->algorithm_enc & disabled_enc) && 913 !(c->algorithm_mac & disabled_mac) && 914 !(c->algorithm_ssl & disabled_ssl)) { 915 co_list[co_list_num].cipher = c; 916 co_list[co_list_num].next = NULL; 917 co_list[co_list_num].prev = NULL; 918 co_list[co_list_num].active = 0; 919 co_list_num++; 920 /* 921 if (!sk_push(ca_list,(char *)c)) goto err; 922 */ 923 } 924 } 925 926 /* 927 * Prepare linked list from list entries 928 */ 929 if (co_list_num > 0) { 930 co_list[0].prev = NULL; 931 932 if (co_list_num > 1) { 933 co_list[0].next = &co_list[1]; 934 935 for (i = 1; i < co_list_num - 1; i++) { 936 co_list[i].prev = &co_list[i - 1]; 937 co_list[i].next = &co_list[i + 1]; 938 } 939 940 co_list[co_list_num - 1].prev = &co_list[co_list_num - 2]; 941 } 942 943 co_list[co_list_num - 1].next = NULL; 944 945 *head_p = &co_list[0]; 946 *tail_p = &co_list[co_list_num - 1]; 947 } 948 } 949 950 static void 951 ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list, int num_of_group_aliases, 952 unsigned long disabled_mkey, unsigned long disabled_auth, 953 unsigned long disabled_enc, unsigned long disabled_mac, 954 unsigned long disabled_ssl, CIPHER_ORDER *head) 955 { 956 CIPHER_ORDER *ciph_curr; 957 const SSL_CIPHER **ca_curr; 958 int i; 959 unsigned long mask_mkey = ~disabled_mkey; 960 unsigned long mask_auth = ~disabled_auth; 961 unsigned long mask_enc = ~disabled_enc; 962 unsigned long mask_mac = ~disabled_mac; 963 unsigned long mask_ssl = ~disabled_ssl; 964 965 /* 966 * First, add the real ciphers as already collected 967 */ 968 ciph_curr = head; 969 ca_curr = ca_list; 970 while (ciph_curr != NULL) { 971 *ca_curr = ciph_curr->cipher; 972 ca_curr++; 973 ciph_curr = ciph_curr->next; 974 } 975 976 /* 977 * Now we add the available ones from the cipher_aliases[] table. 978 * They represent either one or more algorithms, some of which 979 * in any affected category must be supported (set in enabled_mask), 980 * or represent a cipher strength value (will be added in any case because algorithms=0). 981 */ 982 for (i = 0; i < num_of_group_aliases; i++) { 983 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey; 984 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth; 985 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc; 986 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac; 987 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl; 988 989 if (algorithm_mkey) 990 if ((algorithm_mkey & mask_mkey) == 0) 991 continue; 992 993 if (algorithm_auth) 994 if ((algorithm_auth & mask_auth) == 0) 995 continue; 996 997 if (algorithm_enc) 998 if ((algorithm_enc & mask_enc) == 0) 999 continue; 1000 1001 if (algorithm_mac) 1002 if ((algorithm_mac & mask_mac) == 0) 1003 continue; 1004 1005 if (algorithm_ssl) 1006 if ((algorithm_ssl & mask_ssl) == 0) 1007 continue; 1008 1009 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i); 1010 ca_curr++; 1011 } 1012 1013 *ca_curr = NULL; /* end of list */ 1014 } 1015 1016 static void 1017 ssl_cipher_apply_rule(unsigned long cipher_id, unsigned long alg_mkey, 1018 unsigned long alg_auth, unsigned long alg_enc, unsigned long alg_mac, 1019 unsigned long alg_ssl, unsigned long algo_strength, 1020 int rule, int strength_bits, CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 1021 { 1022 CIPHER_ORDER *head, *tail, *curr, *next, *last; 1023 const SSL_CIPHER *cp; 1024 int reverse = 0; 1025 1026 1027 if (rule == CIPHER_DEL) 1028 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */ 1029 1030 head = *head_p; 1031 tail = *tail_p; 1032 1033 if (reverse) { 1034 next = tail; 1035 last = head; 1036 } else { 1037 next = head; 1038 last = tail; 1039 } 1040 1041 curr = NULL; 1042 for (;;) { 1043 if (curr == last) 1044 break; 1045 curr = next; 1046 next = reverse ? curr->prev : curr->next; 1047 1048 cp = curr->cipher; 1049 1050 /* 1051 * Selection criteria is either the value of strength_bits 1052 * or the algorithms used. 1053 */ 1054 if (strength_bits >= 0) { 1055 if (strength_bits != cp->strength_bits) 1056 continue; 1057 } else { 1058 1059 if (alg_mkey && !(alg_mkey & cp->algorithm_mkey)) 1060 continue; 1061 if (alg_auth && !(alg_auth & cp->algorithm_auth)) 1062 continue; 1063 if (alg_enc && !(alg_enc & cp->algorithm_enc)) 1064 continue; 1065 if (alg_mac && !(alg_mac & cp->algorithm_mac)) 1066 continue; 1067 if (alg_ssl && !(alg_ssl & cp->algorithm_ssl)) 1068 continue; 1069 if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength)) 1070 continue; 1071 } 1072 1073 1074 /* add the cipher if it has not been added yet. */ 1075 if (rule == CIPHER_ADD) { 1076 /* reverse == 0 */ 1077 if (!curr->active) { 1078 ll_append_tail(&head, curr, &tail); 1079 curr->active = 1; 1080 } 1081 } 1082 /* Move the added cipher to this location */ 1083 else if (rule == CIPHER_ORD) { 1084 /* reverse == 0 */ 1085 if (curr->active) { 1086 ll_append_tail(&head, curr, &tail); 1087 } 1088 } else if (rule == CIPHER_DEL) { 1089 /* reverse == 1 */ 1090 if (curr->active) { 1091 /* most recently deleted ciphersuites get best positions 1092 * for any future CIPHER_ADD (note that the CIPHER_DEL loop 1093 * works in reverse to maintain the order) */ 1094 ll_append_head(&head, curr, &tail); 1095 curr->active = 0; 1096 } 1097 } else if (rule == CIPHER_KILL) { 1098 /* reverse == 0 */ 1099 if (head == curr) 1100 head = curr->next; 1101 else 1102 curr->prev->next = curr->next; 1103 if (tail == curr) 1104 tail = curr->prev; 1105 curr->active = 0; 1106 if (curr->next != NULL) 1107 curr->next->prev = curr->prev; 1108 if (curr->prev != NULL) 1109 curr->prev->next = curr->next; 1110 curr->next = NULL; 1111 curr->prev = NULL; 1112 } 1113 } 1114 1115 *head_p = head; 1116 *tail_p = tail; 1117 } 1118 1119 static int 1120 ssl_cipher_strength_sort(CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 1121 { 1122 int max_strength_bits, i, *number_uses; 1123 CIPHER_ORDER *curr; 1124 1125 /* 1126 * This routine sorts the ciphers with descending strength. The sorting 1127 * must keep the pre-sorted sequence, so we apply the normal sorting 1128 * routine as '+' movement to the end of the list. 1129 */ 1130 max_strength_bits = 0; 1131 curr = *head_p; 1132 while (curr != NULL) { 1133 if (curr->active && 1134 (curr->cipher->strength_bits > max_strength_bits)) 1135 max_strength_bits = curr->cipher->strength_bits; 1136 curr = curr->next; 1137 } 1138 1139 number_uses = calloc((max_strength_bits + 1), sizeof(int)); 1140 if (!number_uses) { 1141 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT, ERR_R_MALLOC_FAILURE); 1142 return (0); 1143 } 1144 1145 /* 1146 * Now find the strength_bits values actually used 1147 */ 1148 curr = *head_p; 1149 while (curr != NULL) { 1150 if (curr->active) 1151 number_uses[curr->cipher->strength_bits]++; 1152 curr = curr->next; 1153 } 1154 /* 1155 * Go through the list of used strength_bits values in descending 1156 * order. 1157 */ 1158 for (i = max_strength_bits; i >= 0; i--) 1159 if (number_uses[i] > 0) 1160 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p); 1161 1162 free(number_uses); 1163 return (1); 1164 } 1165 1166 static int 1167 ssl_cipher_process_rulestr(const char *rule_str, CIPHER_ORDER **head_p, 1168 CIPHER_ORDER **tail_p, const SSL_CIPHER **ca_list) 1169 { 1170 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl; 1171 unsigned long algo_strength; 1172 int j, multi, found, rule, retval, ok, buflen; 1173 unsigned long cipher_id = 0; 1174 const char *l, *buf; 1175 char ch; 1176 1177 retval = 1; 1178 l = rule_str; 1179 for (;;) { 1180 ch = *l; 1181 1182 if (ch == '\0') 1183 break; 1184 1185 if (ch == '-') { 1186 rule = CIPHER_DEL; 1187 l++; 1188 } else if (ch == '+') { 1189 rule = CIPHER_ORD; 1190 l++; 1191 } else if (ch == '!') { 1192 rule = CIPHER_KILL; 1193 l++; 1194 } else if (ch == '@') { 1195 rule = CIPHER_SPECIAL; 1196 l++; 1197 } else { 1198 rule = CIPHER_ADD; 1199 } 1200 1201 if (ITEM_SEP(ch)) { 1202 l++; 1203 continue; 1204 } 1205 1206 alg_mkey = 0; 1207 alg_auth = 0; 1208 alg_enc = 0; 1209 alg_mac = 0; 1210 alg_ssl = 0; 1211 algo_strength = 0; 1212 1213 for (;;) { 1214 ch = *l; 1215 buf = l; 1216 buflen = 0; 1217 while (((ch >= 'A') && (ch <= 'Z')) || 1218 ((ch >= '0') && (ch <= '9')) || 1219 ((ch >= 'a') && (ch <= 'z')) || 1220 (ch == '-') || (ch == '.')) { 1221 ch = *(++l); 1222 buflen++; 1223 } 1224 1225 if (buflen == 0) { 1226 /* 1227 * We hit something we cannot deal with, 1228 * it is no command or separator nor 1229 * alphanumeric, so we call this an error. 1230 */ 1231 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR, 1232 SSL_R_INVALID_COMMAND); 1233 retval = found = 0; 1234 l++; 1235 break; 1236 } 1237 1238 if (rule == CIPHER_SPECIAL) { 1239 /* unused -- avoid compiler warning */ 1240 found = 0; 1241 /* special treatment */ 1242 break; 1243 } 1244 1245 /* check for multi-part specification */ 1246 if (ch == '+') { 1247 multi = 1; 1248 l++; 1249 } else 1250 multi = 0; 1251 1252 /* 1253 * Now search for the cipher alias in the ca_list. 1254 * Be careful with the strncmp, because the "buflen" 1255 * limitation will make the rule "ADH:SOME" and the 1256 * cipher "ADH-MY-CIPHER" look like a match for 1257 * buflen=3. So additionally check whether the cipher 1258 * name found has the correct length. We can save a 1259 * strlen() call: just checking for the '\0' at the 1260 * right place is sufficient, we have to strncmp() 1261 * anyway (we cannot use strcmp(), because buf is not 1262 * '\0' terminated.) 1263 */ 1264 j = found = 0; 1265 cipher_id = 0; 1266 while (ca_list[j]) { 1267 if (!strncmp(buf, ca_list[j]->name, buflen) && 1268 (ca_list[j]->name[buflen] == '\0')) { 1269 found = 1; 1270 break; 1271 } else 1272 j++; 1273 } 1274 1275 if (!found) 1276 break; /* ignore this entry */ 1277 1278 if (ca_list[j]->algorithm_mkey) { 1279 if (alg_mkey) { 1280 alg_mkey &= ca_list[j]->algorithm_mkey; 1281 if (!alg_mkey) { 1282 found = 0; 1283 break; 1284 } 1285 } else 1286 alg_mkey = ca_list[j]->algorithm_mkey; 1287 } 1288 1289 if (ca_list[j]->algorithm_auth) { 1290 if (alg_auth) { 1291 alg_auth &= ca_list[j]->algorithm_auth; 1292 if (!alg_auth) { 1293 found = 0; 1294 break; 1295 } 1296 } else 1297 alg_auth = ca_list[j]->algorithm_auth; 1298 } 1299 1300 if (ca_list[j]->algorithm_enc) { 1301 if (alg_enc) { 1302 alg_enc &= ca_list[j]->algorithm_enc; 1303 if (!alg_enc) { 1304 found = 0; 1305 break; 1306 } 1307 } else 1308 alg_enc = ca_list[j]->algorithm_enc; 1309 } 1310 1311 if (ca_list[j]->algorithm_mac) { 1312 if (alg_mac) { 1313 alg_mac &= ca_list[j]->algorithm_mac; 1314 if (!alg_mac) { 1315 found = 0; 1316 break; 1317 } 1318 } else 1319 alg_mac = ca_list[j]->algorithm_mac; 1320 } 1321 1322 if (ca_list[j]->algo_strength & SSL_STRONG_MASK) { 1323 if (algo_strength & SSL_STRONG_MASK) { 1324 algo_strength &= 1325 (ca_list[j]->algo_strength & 1326 SSL_STRONG_MASK) | ~SSL_STRONG_MASK; 1327 if (!(algo_strength & 1328 SSL_STRONG_MASK)) { 1329 found = 0; 1330 break; 1331 } 1332 } else 1333 algo_strength |= 1334 ca_list[j]->algo_strength & 1335 SSL_STRONG_MASK; 1336 } 1337 1338 if (ca_list[j]->valid) { 1339 /* 1340 * explicit ciphersuite found; its protocol 1341 * version does not become part of the search 1342 * pattern! 1343 */ 1344 cipher_id = ca_list[j]->id; 1345 } else { 1346 /* 1347 * not an explicit ciphersuite; only in this 1348 * case, the protocol version is considered 1349 * part of the search pattern 1350 */ 1351 if (ca_list[j]->algorithm_ssl) { 1352 if (alg_ssl) { 1353 alg_ssl &= 1354 ca_list[j]->algorithm_ssl; 1355 if (!alg_ssl) { 1356 found = 0; 1357 break; 1358 } 1359 } else 1360 alg_ssl = 1361 ca_list[j]->algorithm_ssl; 1362 } 1363 } 1364 1365 if (!multi) 1366 break; 1367 } 1368 1369 /* 1370 * Ok, we have the rule, now apply it 1371 */ 1372 if (rule == CIPHER_SPECIAL) { 1373 /* special command */ 1374 ok = 0; 1375 if ((buflen == 8) && !strncmp(buf, "STRENGTH", 8)) 1376 ok = ssl_cipher_strength_sort(head_p, tail_p); 1377 else 1378 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR, 1379 SSL_R_INVALID_COMMAND); 1380 if (ok == 0) 1381 retval = 0; 1382 /* 1383 * We do not support any "multi" options 1384 * together with "@", so throw away the 1385 * rest of the command, if any left, until 1386 * end or ':' is found. 1387 */ 1388 while ((*l != '\0') && !ITEM_SEP(*l)) 1389 l++; 1390 } else if (found) { 1391 ssl_cipher_apply_rule(cipher_id, alg_mkey, alg_auth, 1392 alg_enc, alg_mac, alg_ssl, algo_strength, rule, 1393 -1, head_p, tail_p); 1394 } else { 1395 while ((*l != '\0') && !ITEM_SEP(*l)) 1396 l++; 1397 } 1398 if (*l == '\0') 1399 break; /* done */ 1400 } 1401 1402 return (retval); 1403 } 1404 1405 STACK_OF(SSL_CIPHER) * 1406 ssl_create_cipher_list(const SSL_METHOD *ssl_method, 1407 STACK_OF(SSL_CIPHER) **cipher_list, 1408 STACK_OF(SSL_CIPHER) **cipher_list_by_id, 1409 const char *rule_str) 1410 { 1411 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases; 1412 unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl; 1413 STACK_OF(SSL_CIPHER) *cipherstack, *tmp_cipher_list; 1414 const char *rule_p; 1415 CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr; 1416 const SSL_CIPHER **ca_list = NULL; 1417 1418 /* 1419 * Return with error if nothing to do. 1420 */ 1421 if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == NULL) 1422 return NULL; 1423 1424 /* 1425 * To reduce the work to do we only want to process the compiled 1426 * in algorithms, so we first get the mask of disabled ciphers. 1427 */ 1428 ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl); 1429 1430 /* 1431 * Now we have to collect the available ciphers from the compiled 1432 * in ciphers. We cannot get more than the number compiled in, so 1433 * it is used for allocation. 1434 */ 1435 num_of_ciphers = ssl_method->num_ciphers(); 1436 co_list = reallocarray(NULL, num_of_ciphers, sizeof(CIPHER_ORDER)); 1437 if (co_list == NULL) { 1438 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST, ERR_R_MALLOC_FAILURE); 1439 return(NULL); /* Failure */ 1440 } 1441 1442 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, 1443 disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl, 1444 co_list, &head, &tail); 1445 1446 1447 /* Now arrange all ciphers by preference: */ 1448 1449 /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */ 1450 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1451 ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail); 1452 1453 /* 1454 * CHACHA20 is fast and safe on all hardware and is thus our preferred 1455 * symmetric cipher, with AES second. 1456 */ 1457 ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1458 ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1459 1460 /* Temporarily enable everything else for sorting */ 1461 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail); 1462 1463 /* Low priority for MD5 */ 1464 ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail); 1465 1466 /* Move anonymous ciphers to the end. Usually, these will remain disabled. 1467 * (For applications that allow them, they aren't too bad, but we prefer 1468 * authenticated ciphers.) */ 1469 ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1470 1471 /* Move ciphers without forward secrecy to the end */ 1472 ssl_cipher_apply_rule(0, 0, SSL_aECDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1473 ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1474 1475 /* RC4 is sort-of broken -- move the the end */ 1476 ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); 1477 1478 /* Now sort by symmetric encryption strength. The above ordering remains 1479 * in force within each class */ 1480 if (!ssl_cipher_strength_sort(&head, &tail)) { 1481 free(co_list); 1482 return NULL; 1483 } 1484 1485 /* Now disable everything (maintaining the ordering!) */ 1486 ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail); 1487 1488 1489 /* 1490 * We also need cipher aliases for selecting based on the rule_str. 1491 * There might be two types of entries in the rule_str: 1) names 1492 * of ciphers themselves 2) aliases for groups of ciphers. 1493 * For 1) we need the available ciphers and for 2) the cipher 1494 * groups of cipher_aliases added together in one list (otherwise 1495 * we would be happy with just the cipher_aliases table). 1496 */ 1497 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER); 1498 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1; 1499 ca_list = reallocarray(NULL, num_of_alias_max, sizeof(SSL_CIPHER *)); 1500 if (ca_list == NULL) { 1501 free(co_list); 1502 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST, ERR_R_MALLOC_FAILURE); 1503 return(NULL); /* Failure */ 1504 } 1505 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, 1506 disabled_mkey, disabled_auth, disabled_enc, 1507 disabled_mac, disabled_ssl, head); 1508 1509 /* 1510 * If the rule_string begins with DEFAULT, apply the default rule 1511 * before using the (possibly available) additional rules. 1512 */ 1513 ok = 1; 1514 rule_p = rule_str; 1515 if (strncmp(rule_str, "DEFAULT", 7) == 0) { 1516 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST, 1517 &head, &tail, ca_list); 1518 rule_p += 7; 1519 if (*rule_p == ':') 1520 rule_p++; 1521 } 1522 1523 if (ok && (strlen(rule_p) > 0)) 1524 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list); 1525 1526 free((void *)ca_list); /* Not needed anymore */ 1527 1528 if (!ok) { 1529 /* Rule processing failure */ 1530 free(co_list); 1531 return (NULL); 1532 } 1533 1534 /* 1535 * Allocate new "cipherstack" for the result, return with error 1536 * if we cannot get one. 1537 */ 1538 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) { 1539 free(co_list); 1540 return (NULL); 1541 } 1542 1543 /* 1544 * The cipher selection for the list is done. The ciphers are added 1545 * to the resulting precedence to the STACK_OF(SSL_CIPHER). 1546 */ 1547 for (curr = head; curr != NULL; curr = curr->next) { 1548 if (curr->active) { 1549 sk_SSL_CIPHER_push(cipherstack, curr->cipher); 1550 } 1551 } 1552 free(co_list); /* Not needed any longer */ 1553 1554 tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack); 1555 if (tmp_cipher_list == NULL) { 1556 sk_SSL_CIPHER_free(cipherstack); 1557 return NULL; 1558 } 1559 if (*cipher_list != NULL) 1560 sk_SSL_CIPHER_free(*cipher_list); 1561 *cipher_list = cipherstack; 1562 if (*cipher_list_by_id != NULL) 1563 sk_SSL_CIPHER_free(*cipher_list_by_id); 1564 *cipher_list_by_id = tmp_cipher_list; 1565 (void)sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id, ssl_cipher_ptr_id_cmp); 1566 1567 sk_SSL_CIPHER_sort(*cipher_list_by_id); 1568 return (cipherstack); 1569 } 1570 1571 char * 1572 SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len) 1573 { 1574 unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, alg2; 1575 const char *ver, *kx, *au, *enc, *mac; 1576 char *ret; 1577 int l; 1578 1579 alg_mkey = cipher->algorithm_mkey; 1580 alg_auth = cipher->algorithm_auth; 1581 alg_enc = cipher->algorithm_enc; 1582 alg_mac = cipher->algorithm_mac; 1583 alg_ssl = cipher->algorithm_ssl; 1584 1585 alg2 = cipher->algorithm2; 1586 1587 if (alg_ssl & SSL_SSLV3) 1588 ver = "SSLv3"; 1589 else if (alg_ssl & SSL_TLSV1_2) 1590 ver = "TLSv1.2"; 1591 else 1592 ver = "unknown"; 1593 1594 switch (alg_mkey) { 1595 case SSL_kRSA: 1596 kx = "RSA"; 1597 break; 1598 case SSL_kDHE: 1599 kx = "DH"; 1600 break; 1601 case SSL_kECDHr: 1602 kx = "ECDH/RSA"; 1603 break; 1604 case SSL_kECDHe: 1605 kx = "ECDH/ECDSA"; 1606 break; 1607 case SSL_kECDHE: 1608 kx = "ECDH"; 1609 break; 1610 case SSL_kGOST: 1611 kx = "GOST"; 1612 break; 1613 default: 1614 kx = "unknown"; 1615 } 1616 1617 switch (alg_auth) { 1618 case SSL_aRSA: 1619 au = "RSA"; 1620 break; 1621 case SSL_aDSS: 1622 au = "DSS"; 1623 break; 1624 case SSL_aECDH: 1625 au = "ECDH"; 1626 break; 1627 case SSL_aNULL: 1628 au = "None"; 1629 break; 1630 case SSL_aECDSA: 1631 au = "ECDSA"; 1632 break; 1633 case SSL_aGOST94: 1634 au = "GOST94"; 1635 break; 1636 case SSL_aGOST01: 1637 au = "GOST01"; 1638 break; 1639 default: 1640 au = "unknown"; 1641 break; 1642 } 1643 1644 switch (alg_enc) { 1645 case SSL_DES: 1646 enc = "DES(56)"; 1647 break; 1648 case SSL_3DES: 1649 enc = "3DES(168)"; 1650 break; 1651 case SSL_RC4: 1652 enc = alg2 & SSL2_CF_8_BYTE_ENC ? "RC4(64)" : "RC4(128)"; 1653 break; 1654 case SSL_IDEA: 1655 enc = "IDEA(128)"; 1656 break; 1657 case SSL_eNULL: 1658 enc = "None"; 1659 break; 1660 case SSL_AES128: 1661 enc = "AES(128)"; 1662 break; 1663 case SSL_AES256: 1664 enc = "AES(256)"; 1665 break; 1666 case SSL_AES128GCM: 1667 enc = "AESGCM(128)"; 1668 break; 1669 case SSL_AES256GCM: 1670 enc = "AESGCM(256)"; 1671 break; 1672 case SSL_CAMELLIA128: 1673 enc = "Camellia(128)"; 1674 break; 1675 case SSL_CAMELLIA256: 1676 enc = "Camellia(256)"; 1677 break; 1678 case SSL_CHACHA20POLY1305: 1679 enc = "ChaCha20-Poly1305"; 1680 break; 1681 case SSL_eGOST2814789CNT: 1682 enc = "GOST-28178-89-CNT"; 1683 break; 1684 default: 1685 enc = "unknown"; 1686 break; 1687 } 1688 1689 switch (alg_mac) { 1690 case SSL_MD5: 1691 mac = "MD5"; 1692 break; 1693 case SSL_SHA1: 1694 mac = "SHA1"; 1695 break; 1696 case SSL_SHA256: 1697 mac = "SHA256"; 1698 break; 1699 case SSL_SHA384: 1700 mac = "SHA384"; 1701 break; 1702 case SSL_AEAD: 1703 mac = "AEAD"; 1704 break; 1705 case SSL_GOST94: 1706 mac = "GOST94"; 1707 break; 1708 case SSL_GOST89MAC: 1709 mac = "GOST89IMIT"; 1710 break; 1711 case SSL_STREEBOG256: 1712 mac = "STREEBOG256"; 1713 break; 1714 case SSL_STREEBOG512: 1715 mac = "STREEBOG512"; 1716 break; 1717 default: 1718 mac = "unknown"; 1719 break; 1720 } 1721 1722 if (asprintf(&ret, "%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s\n", 1723 cipher->name, ver, kx, au, enc, mac) == -1) 1724 return "OPENSSL_malloc Error"; 1725 1726 if (buf != NULL) { 1727 l = strlcpy(buf, ret, len); 1728 free(ret); 1729 ret = buf; 1730 if (l >= len) 1731 ret = "Buffer too small"; 1732 } 1733 1734 return (ret); 1735 } 1736 1737 char * 1738 SSL_CIPHER_get_version(const SSL_CIPHER *c) 1739 { 1740 if (c == NULL) 1741 return("(NONE)"); 1742 if ((c->id >> 24) == 3) 1743 return("TLSv1/SSLv3"); 1744 else 1745 return("unknown"); 1746 } 1747 1748 /* return the actual cipher being used */ 1749 const char * 1750 SSL_CIPHER_get_name(const SSL_CIPHER *c) 1751 { 1752 if (c != NULL) 1753 return (c->name); 1754 return("(NONE)"); 1755 } 1756 1757 /* number of bits for symmetric cipher */ 1758 int 1759 SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits) 1760 { 1761 int ret = 0; 1762 1763 if (c != NULL) { 1764 if (alg_bits != NULL) 1765 *alg_bits = c->alg_bits; 1766 ret = c->strength_bits; 1767 } 1768 return (ret); 1769 } 1770 1771 unsigned long 1772 SSL_CIPHER_get_id(const SSL_CIPHER *c) 1773 { 1774 return c->id; 1775 } 1776 1777 void * 1778 SSL_COMP_get_compression_methods(void) 1779 { 1780 return NULL; 1781 } 1782 1783 int 1784 SSL_COMP_add_compression_method(int id, void *cm) 1785 { 1786 return 1; 1787 } 1788 1789 const char * 1790 SSL_COMP_get_name(const void *comp) 1791 { 1792 return NULL; 1793 } 1794