1/* ssl/ssl_ciph.c */ 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#include <stdio.h> 60#include <openssl/objects.h> 61#include <openssl/comp.h> 62#include <openssl/fips.h> 63#include "ssl_locl.h" 64 65#define SSL_ENC_DES_IDX 0 66#define SSL_ENC_3DES_IDX 1 67#define SSL_ENC_RC4_IDX 2 68#define SSL_ENC_RC2_IDX 3 69#define SSL_ENC_IDEA_IDX 4 70#define SSL_ENC_eFZA_IDX 5 71#define SSL_ENC_NULL_IDX 6 72#define SSL_ENC_AES128_IDX 7 73#define SSL_ENC_AES256_IDX 8 74#define SSL_ENC_NUM_IDX 9 75 76static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={ 77 NULL,NULL,NULL,NULL,NULL,NULL, 78 }; 79 80static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL; 81 82#define SSL_MD_MD5_IDX 0 83#define SSL_MD_SHA1_IDX 1 84#define SSL_MD_NUM_IDX 2 85static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={ 86 NULL,NULL, 87 }; 88 89#define CIPHER_ADD 1 90#define CIPHER_KILL 2 91#define CIPHER_DEL 3 92#define CIPHER_ORD 4 93#define CIPHER_SPECIAL 5 94 95typedef struct cipher_order_st 96 { 97 SSL_CIPHER *cipher; 98 int active; 99 int dead; 100 struct cipher_order_st *next,*prev; 101 } CIPHER_ORDER; 102 103static const SSL_CIPHER cipher_aliases[]={ 104 /* Don't include eNULL unless specifically enabled. */ 105 {0,SSL_TXT_ALL, 0,SSL_ALL & ~SSL_eNULL, SSL_ALL ,0,0,0,SSL_ALL,SSL_ALL}, /* must be first */ 106 {0,SSL_TXT_CMPALL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0}, /* COMPLEMENT OF ALL */ 107 {0,SSL_TXT_CMPDEF,0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK,0}, 108 {0,SSL_TXT_kKRB5,0,SSL_kKRB5,0,0,0,0,SSL_MKEY_MASK,0}, /* VRS Kerberos5 */ 109 {0,SSL_TXT_kRSA,0,SSL_kRSA, 0,0,0,0,SSL_MKEY_MASK,0}, 110 {0,SSL_TXT_kDHr,0,SSL_kDHr, 0,0,0,0,SSL_MKEY_MASK,0}, 111 {0,SSL_TXT_kDHd,0,SSL_kDHd, 0,0,0,0,SSL_MKEY_MASK,0}, 112 {0,SSL_TXT_kEDH,0,SSL_kEDH, 0,0,0,0,SSL_MKEY_MASK,0}, 113 {0,SSL_TXT_kFZA,0,SSL_kFZA, 0,0,0,0,SSL_MKEY_MASK,0}, 114 {0,SSL_TXT_DH, 0,SSL_DH, 0,0,0,0,SSL_MKEY_MASK,0}, 115 {0,SSL_TXT_EDH, 0,SSL_EDH, 0,0,0,0,SSL_MKEY_MASK|SSL_AUTH_MASK,0}, 116 117 {0,SSL_TXT_aKRB5,0,SSL_aKRB5,0,0,0,0,SSL_AUTH_MASK,0}, /* VRS Kerberos5 */ 118 {0,SSL_TXT_aRSA,0,SSL_aRSA, 0,0,0,0,SSL_AUTH_MASK,0}, 119 {0,SSL_TXT_aDSS,0,SSL_aDSS, 0,0,0,0,SSL_AUTH_MASK,0}, 120 {0,SSL_TXT_aFZA,0,SSL_aFZA, 0,0,0,0,SSL_AUTH_MASK,0}, 121 {0,SSL_TXT_aNULL,0,SSL_aNULL,0,0,0,0,SSL_AUTH_MASK,0}, 122 {0,SSL_TXT_aDH, 0,SSL_aDH, 0,0,0,0,SSL_AUTH_MASK,0}, 123 {0,SSL_TXT_DSS, 0,SSL_DSS, 0,0,0,0,SSL_AUTH_MASK,0}, 124 125 {0,SSL_TXT_DES, 0,SSL_DES, 0,0,0,0,SSL_ENC_MASK,0}, 126 {0,SSL_TXT_3DES,0,SSL_3DES, 0,0,0,0,SSL_ENC_MASK,0}, 127 {0,SSL_TXT_RC4, 0,SSL_RC4, 0,0,0,0,SSL_ENC_MASK,0}, 128 {0,SSL_TXT_RC2, 0,SSL_RC2, 0,0,0,0,SSL_ENC_MASK,0}, 129#ifndef OPENSSL_NO_IDEA 130 {0,SSL_TXT_IDEA,0,SSL_IDEA, 0,0,0,0,SSL_ENC_MASK,0}, 131#endif 132 {0,SSL_TXT_eNULL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0}, 133 {0,SSL_TXT_eFZA,0,SSL_eFZA, 0,0,0,0,SSL_ENC_MASK,0}, 134 {0,SSL_TXT_AES, 0,SSL_AES, 0,0,0,0,SSL_ENC_MASK,0}, 135 136 {0,SSL_TXT_MD5, 0,SSL_MD5, 0,0,0,0,SSL_MAC_MASK,0}, 137 {0,SSL_TXT_SHA1,0,SSL_SHA1, 0,0,0,0,SSL_MAC_MASK,0}, 138 {0,SSL_TXT_SHA, 0,SSL_SHA, 0,0,0,0,SSL_MAC_MASK,0}, 139 140 {0,SSL_TXT_NULL,0,SSL_NULL, 0,0,0,0,SSL_ENC_MASK,0}, 141 {0,SSL_TXT_KRB5,0,SSL_KRB5, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0}, 142 {0,SSL_TXT_RSA, 0,SSL_RSA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0}, 143 {0,SSL_TXT_ADH, 0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0}, 144 {0,SSL_TXT_FZA, 0,SSL_FZA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK,0}, 145 146 {0,SSL_TXT_SSLV2, 0,SSL_SSLV2, 0,0,0,0,SSL_SSL_MASK,0}, 147 {0,SSL_TXT_SSLV3, 0,SSL_SSLV3, 0,0,0,0,SSL_SSL_MASK,0}, 148 {0,SSL_TXT_TLSV1, 0,SSL_TLSV1, 0,0,0,0,SSL_SSL_MASK,0}, 149 150 {0,SSL_TXT_EXP ,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK}, 151 {0,SSL_TXT_EXPORT,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK}, 152 {0,SSL_TXT_EXP40, 0, 0, SSL_EXP40, 0,0,0,0,SSL_STRONG_MASK}, 153 {0,SSL_TXT_EXP56, 0, 0, SSL_EXP56, 0,0,0,0,SSL_STRONG_MASK}, 154 {0,SSL_TXT_LOW, 0, 0, SSL_LOW, 0,0,0,0,SSL_STRONG_MASK}, 155 {0,SSL_TXT_MEDIUM,0, 0,SSL_MEDIUM, 0,0,0,0,SSL_STRONG_MASK}, 156 {0,SSL_TXT_HIGH, 0, 0, SSL_HIGH, 0,0,0,0,SSL_STRONG_MASK}, 157 {0,SSL_TXT_FIPS, 0, 0, SSL_FIPS, 0,0,0,0,SSL_FIPS|SSL_STRONG_NONE}, 158 }; 159 160static int init_ciphers=1; 161 162static void load_ciphers(void) 163 { 164 ssl_cipher_methods[SSL_ENC_DES_IDX]= 165 EVP_get_cipherbyname(SN_des_cbc); 166 ssl_cipher_methods[SSL_ENC_3DES_IDX]= 167 EVP_get_cipherbyname(SN_des_ede3_cbc); 168 ssl_cipher_methods[SSL_ENC_RC4_IDX]= 169 EVP_get_cipherbyname(SN_rc4); 170 ssl_cipher_methods[SSL_ENC_RC2_IDX]= 171 EVP_get_cipherbyname(SN_rc2_cbc); 172#ifndef OPENSSL_NO_IDEA 173 ssl_cipher_methods[SSL_ENC_IDEA_IDX]= 174 EVP_get_cipherbyname(SN_idea_cbc); 175#else 176 ssl_cipher_methods[SSL_ENC_IDEA_IDX]= NULL; 177#endif 178 ssl_cipher_methods[SSL_ENC_AES128_IDX]= 179 EVP_get_cipherbyname(SN_aes_128_cbc); 180 ssl_cipher_methods[SSL_ENC_AES256_IDX]= 181 EVP_get_cipherbyname(SN_aes_256_cbc); 182 183 ssl_digest_methods[SSL_MD_MD5_IDX]= 184 EVP_get_digestbyname(SN_md5); 185 ssl_digest_methods[SSL_MD_SHA1_IDX]= 186 EVP_get_digestbyname(SN_sha1); 187 init_ciphers=0; 188 } 189 190int ssl_cipher_get_evp(SSL_SESSION *s, const EVP_CIPHER **enc, 191 const EVP_MD **md, SSL_COMP **comp) 192 { 193 int i; 194 SSL_CIPHER *c; 195 196 c=s->cipher; 197 if (c == NULL) return(0); 198 if (comp != NULL) 199 { 200 SSL_COMP ctmp; 201 202 if (s->compress_meth == 0) 203 *comp=NULL; 204 else if (ssl_comp_methods == NULL) 205 { 206 /* bad */ 207 *comp=NULL; 208 } 209 else 210 { 211 212 ctmp.id=s->compress_meth; 213 i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp); 214 if (i >= 0) 215 *comp=sk_SSL_COMP_value(ssl_comp_methods,i); 216 else 217 *comp=NULL; 218 } 219 } 220 221 if ((enc == NULL) || (md == NULL)) return(0); 222 223 switch (c->algorithms & SSL_ENC_MASK) 224 { 225 case SSL_DES: 226 i=SSL_ENC_DES_IDX; 227 break; 228 case SSL_3DES: 229 i=SSL_ENC_3DES_IDX; 230 break; 231 case SSL_RC4: 232 i=SSL_ENC_RC4_IDX; 233 break; 234 case SSL_RC2: 235 i=SSL_ENC_RC2_IDX; 236 break; 237 case SSL_IDEA: 238 i=SSL_ENC_IDEA_IDX; 239 break; 240 case SSL_eNULL: 241 i=SSL_ENC_NULL_IDX; 242 break; 243 case SSL_AES: 244 switch(c->alg_bits) 245 { 246 case 128: i=SSL_ENC_AES128_IDX; break; 247 case 256: i=SSL_ENC_AES256_IDX; break; 248 default: i=-1; break; 249 } 250 break; 251 default: 252 i= -1; 253 break; 254 } 255 256 if ((i < 0) || (i > SSL_ENC_NUM_IDX)) 257 *enc=NULL; 258 else 259 { 260 if (i == SSL_ENC_NULL_IDX) 261 *enc=EVP_enc_null(); 262 else 263 *enc=ssl_cipher_methods[i]; 264 } 265 266 switch (c->algorithms & SSL_MAC_MASK) 267 { 268 case SSL_MD5: 269 i=SSL_MD_MD5_IDX; 270 break; 271 case SSL_SHA1: 272 i=SSL_MD_SHA1_IDX; 273 break; 274 default: 275 i= -1; 276 break; 277 } 278 if ((i < 0) || (i > SSL_MD_NUM_IDX)) 279 *md=NULL; 280 else 281 *md=ssl_digest_methods[i]; 282 283 if ((*enc != NULL) && (*md != NULL)) 284 return(1); 285 else 286 return(0); 287 } 288 289#define ITEM_SEP(a) \ 290 (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ',')) 291 292static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr, 293 CIPHER_ORDER **tail) 294 { 295 if (curr == *tail) return; 296 if (curr == *head) 297 *head=curr->next; 298 if (curr->prev != NULL) 299 curr->prev->next=curr->next; 300 if (curr->next != NULL) /* should always be true */ 301 curr->next->prev=curr->prev; 302 (*tail)->next=curr; 303 curr->prev= *tail; 304 curr->next=NULL; 305 *tail=curr; 306 } 307 308static unsigned long ssl_cipher_get_disabled(void) 309 { 310 unsigned long mask; 311 312 mask = SSL_kFZA; 313#ifdef OPENSSL_NO_RSA 314 mask |= SSL_aRSA|SSL_kRSA; 315#endif 316#ifdef OPENSSL_NO_DSA 317 mask |= SSL_aDSS; 318#endif 319#ifdef OPENSSL_NO_DH 320 mask |= SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH; 321#endif 322#ifdef OPENSSL_NO_KRB5 323 mask |= SSL_kKRB5|SSL_aKRB5; 324#endif 325 326#ifdef SSL_FORBID_ENULL 327 mask |= SSL_eNULL; 328#endif 329 330 mask |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0; 331 mask |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0; 332 mask |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0; 333 mask |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0; 334 mask |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0; 335 mask |= (ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL) ? SSL_eFZA:0; 336 mask |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES:0; 337 338 mask |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0; 339 mask |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0; 340 341 return(mask); 342 } 343 344static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method, 345 int num_of_ciphers, unsigned long mask, CIPHER_ORDER *co_list, 346 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 347 { 348 int i, co_list_num; 349 SSL_CIPHER *c; 350 351 /* 352 * We have num_of_ciphers descriptions compiled in, depending on the 353 * method selected (SSLv2 and/or SSLv3, TLSv1 etc). 354 * These will later be sorted in a linked list with at most num 355 * entries. 356 */ 357 358 /* Get the initial list of ciphers */ 359 co_list_num = 0; /* actual count of ciphers */ 360 for (i = 0; i < num_of_ciphers; i++) 361 { 362 c = ssl_method->get_cipher(i); 363 /* drop those that use any of that is not available */ 364#ifdef OPENSSL_FIPS 365 if ((c != NULL) && c->valid && !(c->algorithms & mask) 366 && (!FIPS_mode() || (c->algo_strength & SSL_FIPS))) 367#else 368 if ((c != NULL) && c->valid && !(c->algorithms & mask)) 369#endif 370 { 371 co_list[co_list_num].cipher = c; 372 co_list[co_list_num].next = NULL; 373 co_list[co_list_num].prev = NULL; 374 co_list[co_list_num].active = 0; 375 co_list_num++; 376#ifdef KSSL_DEBUG 377 printf("\t%d: %s %lx %lx\n",i,c->name,c->id,c->algorithms); 378#endif /* KSSL_DEBUG */ 379 /* 380 if (!sk_push(ca_list,(char *)c)) goto err; 381 */ 382 } 383 } 384 385 /* 386 * Prepare linked list from list entries 387 */ 388 for (i = 1; i < co_list_num - 1; i++) 389 { 390 co_list[i].prev = &(co_list[i-1]); 391 co_list[i].next = &(co_list[i+1]); 392 } 393 if (co_list_num > 0) 394 { 395 (*head_p) = &(co_list[0]); 396 (*head_p)->prev = NULL; 397 (*head_p)->next = &(co_list[1]); 398 (*tail_p) = &(co_list[co_list_num - 1]); 399 (*tail_p)->prev = &(co_list[co_list_num - 2]); 400 (*tail_p)->next = NULL; 401 } 402 } 403 404static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list, 405 int num_of_group_aliases, unsigned long mask, 406 CIPHER_ORDER *head) 407 { 408 CIPHER_ORDER *ciph_curr; 409 SSL_CIPHER **ca_curr; 410 int i; 411 412 /* 413 * First, add the real ciphers as already collected 414 */ 415 ciph_curr = head; 416 ca_curr = ca_list; 417 while (ciph_curr != NULL) 418 { 419 *ca_curr = ciph_curr->cipher; 420 ca_curr++; 421 ciph_curr = ciph_curr->next; 422 } 423 424 /* 425 * Now we add the available ones from the cipher_aliases[] table. 426 * They represent either an algorithm, that must be fully 427 * supported (not match any bit in mask) or represent a cipher 428 * strength value (will be added in any case because algorithms=0). 429 */ 430 for (i = 0; i < num_of_group_aliases; i++) 431 { 432 if ((i == 0) || /* always fetch "ALL" */ 433 !(cipher_aliases[i].algorithms & mask)) 434 { 435 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i); 436 ca_curr++; 437 } 438 } 439 440 *ca_curr = NULL; /* end of list */ 441 } 442 443static void ssl_cipher_apply_rule(unsigned long algorithms, unsigned long mask, 444 unsigned long algo_strength, unsigned long mask_strength, 445 int rule, int strength_bits, CIPHER_ORDER *co_list, 446 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 447 { 448 CIPHER_ORDER *head, *tail, *curr, *curr2, *tail2; 449 SSL_CIPHER *cp; 450 unsigned long ma, ma_s; 451 452#ifdef CIPHER_DEBUG 453 printf("Applying rule %d with %08lx %08lx %08lx %08lx (%d)\n", 454 rule, algorithms, mask, algo_strength, mask_strength, 455 strength_bits); 456#endif 457 458 curr = head = *head_p; 459 curr2 = head; 460 tail2 = tail = *tail_p; 461 for (;;) 462 { 463 if ((curr == NULL) || (curr == tail2)) break; 464 curr = curr2; 465 curr2 = curr->next; 466 467 cp = curr->cipher; 468 469 /* 470 * Selection criteria is either the number of strength_bits 471 * or the algorithm used. 472 */ 473 if (strength_bits == -1) 474 { 475 ma = mask & cp->algorithms; 476 ma_s = mask_strength & cp->algo_strength; 477 478#ifdef CIPHER_DEBUG 479 printf("\nName: %s:\nAlgo = %08lx Algo_strength = %08lx\nMask = %08lx Mask_strength %08lx\n", cp->name, cp->algorithms, cp->algo_strength, mask, mask_strength); 480 printf("ma = %08lx ma_s %08lx, ma&algo=%08lx, ma_s&algos=%08lx\n", ma, ma_s, ma&algorithms, ma_s&algo_strength); 481#endif 482 /* 483 * Select: if none of the mask bit was met from the 484 * cipher or not all of the bits were met, the 485 * selection does not apply. 486 */ 487 if (((ma == 0) && (ma_s == 0)) || 488 ((ma & algorithms) != ma) || 489 ((ma_s & algo_strength) != ma_s)) 490 continue; /* does not apply */ 491 } 492 else if (strength_bits != cp->strength_bits) 493 continue; /* does not apply */ 494 495#ifdef CIPHER_DEBUG 496 printf("Action = %d\n", rule); 497#endif 498 499 /* add the cipher if it has not been added yet. */ 500 if (rule == CIPHER_ADD) 501 { 502 if (!curr->active) 503 { 504 ll_append_tail(&head, curr, &tail); 505 curr->active = 1; 506 } 507 } 508 /* Move the added cipher to this location */ 509 else if (rule == CIPHER_ORD) 510 { 511 if (curr->active) 512 { 513 ll_append_tail(&head, curr, &tail); 514 } 515 } 516 else if (rule == CIPHER_DEL) 517 curr->active = 0; 518 else if (rule == CIPHER_KILL) 519 { 520 if (head == curr) 521 head = curr->next; 522 else 523 curr->prev->next = curr->next; 524 if (tail == curr) 525 tail = curr->prev; 526 curr->active = 0; 527 if (curr->next != NULL) 528 curr->next->prev = curr->prev; 529 if (curr->prev != NULL) 530 curr->prev->next = curr->next; 531 curr->next = NULL; 532 curr->prev = NULL; 533 } 534 } 535 536 *head_p = head; 537 *tail_p = tail; 538 } 539 540static int ssl_cipher_strength_sort(CIPHER_ORDER *co_list, 541 CIPHER_ORDER **head_p, 542 CIPHER_ORDER **tail_p) 543 { 544 int max_strength_bits, i, *number_uses; 545 CIPHER_ORDER *curr; 546 547 /* 548 * This routine sorts the ciphers with descending strength. The sorting 549 * must keep the pre-sorted sequence, so we apply the normal sorting 550 * routine as '+' movement to the end of the list. 551 */ 552 max_strength_bits = 0; 553 curr = *head_p; 554 while (curr != NULL) 555 { 556 if (curr->active && 557 (curr->cipher->strength_bits > max_strength_bits)) 558 max_strength_bits = curr->cipher->strength_bits; 559 curr = curr->next; 560 } 561 562 number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int)); 563 if (!number_uses) 564 { 565 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE); 566 return(0); 567 } 568 memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int)); 569 570 /* 571 * Now find the strength_bits values actually used 572 */ 573 curr = *head_p; 574 while (curr != NULL) 575 { 576 if (curr->active) 577 number_uses[curr->cipher->strength_bits]++; 578 curr = curr->next; 579 } 580 /* 581 * Go through the list of used strength_bits values in descending 582 * order. 583 */ 584 for (i = max_strength_bits; i >= 0; i--) 585 if (number_uses[i] > 0) 586 ssl_cipher_apply_rule(0, 0, 0, 0, CIPHER_ORD, i, 587 co_list, head_p, tail_p); 588 589 OPENSSL_free(number_uses); 590 return(1); 591 } 592 593static int ssl_cipher_process_rulestr(const char *rule_str, 594 CIPHER_ORDER *co_list, CIPHER_ORDER **head_p, 595 CIPHER_ORDER **tail_p, SSL_CIPHER **ca_list) 596 { 597 unsigned long algorithms, mask, algo_strength, mask_strength; 598 const char *l, *start, *buf; 599 int j, multi, found, rule, retval, ok, buflen; 600 char ch; 601 602 retval = 1; 603 l = rule_str; 604 for (;;) 605 { 606 ch = *l; 607 608 if (ch == '\0') 609 break; /* done */ 610 if (ch == '-') 611 { rule = CIPHER_DEL; l++; } 612 else if (ch == '+') 613 { rule = CIPHER_ORD; l++; } 614 else if (ch == '!') 615 { rule = CIPHER_KILL; l++; } 616 else if (ch == '@') 617 { rule = CIPHER_SPECIAL; l++; } 618 else 619 { rule = CIPHER_ADD; } 620 621 if (ITEM_SEP(ch)) 622 { 623 l++; 624 continue; 625 } 626 627 algorithms = mask = algo_strength = mask_strength = 0; 628 629 start=l; 630 for (;;) 631 { 632 ch = *l; 633 buf = l; 634 buflen = 0; 635#ifndef CHARSET_EBCDIC 636 while ( ((ch >= 'A') && (ch <= 'Z')) || 637 ((ch >= '0') && (ch <= '9')) || 638 ((ch >= 'a') && (ch <= 'z')) || 639 (ch == '-')) 640#else 641 while ( isalnum(ch) || (ch == '-')) 642#endif 643 { 644 ch = *(++l); 645 buflen++; 646 } 647 648 if (buflen == 0) 649 { 650 /* 651 * We hit something we cannot deal with, 652 * it is no command or separator nor 653 * alphanumeric, so we call this an error. 654 */ 655 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR, 656 SSL_R_INVALID_COMMAND); 657 retval = found = 0; 658 l++; 659 break; 660 } 661 662 if (rule == CIPHER_SPECIAL) 663 { 664 found = 0; /* unused -- avoid compiler warning */ 665 break; /* special treatment */ 666 } 667 668 /* check for multi-part specification */ 669 if (ch == '+') 670 { 671 multi=1; 672 l++; 673 } 674 else 675 multi=0; 676 677 /* 678 * Now search for the cipher alias in the ca_list. Be careful 679 * with the strncmp, because the "buflen" limitation 680 * will make the rule "ADH:SOME" and the cipher 681 * "ADH-MY-CIPHER" look like a match for buflen=3. 682 * So additionally check whether the cipher name found 683 * has the correct length. We can save a strlen() call: 684 * just checking for the '\0' at the right place is 685 * sufficient, we have to strncmp() anyway. (We cannot 686 * use strcmp(), because buf is not '\0' terminated.) 687 */ 688 j = found = 0; 689 while (ca_list[j]) 690 { 691 if (!strncmp(buf, ca_list[j]->name, buflen) && 692 (ca_list[j]->name[buflen] == '\0')) 693 { 694 found = 1; 695 break; 696 } 697 else 698 j++; 699 } 700 if (!found) 701 break; /* ignore this entry */ 702 703 algorithms |= ca_list[j]->algorithms; 704 mask |= ca_list[j]->mask; 705 algo_strength |= ca_list[j]->algo_strength; 706 mask_strength |= ca_list[j]->mask_strength; 707 708 if (!multi) break; 709 } 710 711 /* 712 * Ok, we have the rule, now apply it 713 */ 714 if (rule == CIPHER_SPECIAL) 715 { /* special command */ 716 ok = 0; 717 if ((buflen == 8) && 718 !strncmp(buf, "STRENGTH", 8)) 719 ok = ssl_cipher_strength_sort(co_list, 720 head_p, tail_p); 721 else 722 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR, 723 SSL_R_INVALID_COMMAND); 724 if (ok == 0) 725 retval = 0; 726 /* 727 * We do not support any "multi" options 728 * together with "@", so throw away the 729 * rest of the command, if any left, until 730 * end or ':' is found. 731 */ 732 while ((*l != '\0') && ITEM_SEP(*l)) 733 l++; 734 } 735 else if (found) 736 { 737 ssl_cipher_apply_rule(algorithms, mask, 738 algo_strength, mask_strength, rule, -1, 739 co_list, head_p, tail_p); 740 } 741 else 742 { 743 while ((*l != '\0') && ITEM_SEP(*l)) 744 l++; 745 } 746 if (*l == '\0') break; /* done */ 747 } 748 749 return(retval); 750 } 751 752STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method, 753 STACK_OF(SSL_CIPHER) **cipher_list, 754 STACK_OF(SSL_CIPHER) **cipher_list_by_id, 755 const char *rule_str) 756 { 757 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases; 758 unsigned long disabled_mask; 759 STACK_OF(SSL_CIPHER) *cipherstack; 760 const char *rule_p; 761 CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr; 762 SSL_CIPHER **ca_list = NULL; 763 764 /* 765 * Return with error if nothing to do. 766 */ 767 if (rule_str == NULL) return(NULL); 768 769 if (init_ciphers) 770 { 771 CRYPTO_w_lock(CRYPTO_LOCK_SSL); 772 if (init_ciphers) load_ciphers(); 773 CRYPTO_w_unlock(CRYPTO_LOCK_SSL); 774 } 775 776 /* 777 * To reduce the work to do we only want to process the compiled 778 * in algorithms, so we first get the mask of disabled ciphers. 779 */ 780 disabled_mask = ssl_cipher_get_disabled(); 781 782 /* 783 * Now we have to collect the available ciphers from the compiled 784 * in ciphers. We cannot get more than the number compiled in, so 785 * it is used for allocation. 786 */ 787 num_of_ciphers = ssl_method->num_ciphers(); 788#ifdef KSSL_DEBUG 789 printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers); 790#endif /* KSSL_DEBUG */ 791 co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers); 792 if (co_list == NULL) 793 { 794 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE); 795 return(NULL); /* Failure */ 796 } 797 798 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, disabled_mask, 799 co_list, &head, &tail); 800 801 /* 802 * We also need cipher aliases for selecting based on the rule_str. 803 * There might be two types of entries in the rule_str: 1) names 804 * of ciphers themselves 2) aliases for groups of ciphers. 805 * For 1) we need the available ciphers and for 2) the cipher 806 * groups of cipher_aliases added together in one list (otherwise 807 * we would be happy with just the cipher_aliases table). 808 */ 809 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER); 810 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1; 811 ca_list = 812 (SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max); 813 if (ca_list == NULL) 814 { 815 OPENSSL_free(co_list); 816 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE); 817 return(NULL); /* Failure */ 818 } 819 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mask, 820 head); 821 822 /* 823 * If the rule_string begins with DEFAULT, apply the default rule 824 * before using the (possibly available) additional rules. 825 */ 826 ok = 1; 827 rule_p = rule_str; 828 if (strncmp(rule_str,"DEFAULT",7) == 0) 829 { 830 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST, 831 co_list, &head, &tail, ca_list); 832 rule_p += 7; 833 if (*rule_p == ':') 834 rule_p++; 835 } 836 837 if (ok && (strlen(rule_p) > 0)) 838 ok = ssl_cipher_process_rulestr(rule_p, co_list, &head, &tail, 839 ca_list); 840 841 OPENSSL_free(ca_list); /* Not needed anymore */ 842 843 if (!ok) 844 { /* Rule processing failure */ 845 OPENSSL_free(co_list); 846 return(NULL); 847 } 848 /* 849 * Allocate new "cipherstack" for the result, return with error 850 * if we cannot get one. 851 */ 852 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) 853 { 854 OPENSSL_free(co_list); 855 return(NULL); 856 } 857 858 /* 859 * The cipher selection for the list is done. The ciphers are added 860 * to the resulting precedence to the STACK_OF(SSL_CIPHER). 861 */ 862 for (curr = head; curr != NULL; curr = curr->next) 863 { 864#ifdef OPENSSL_FIPS 865 if (curr->active && (!FIPS_mode() || curr->cipher->algo_strength & SSL_FIPS)) 866#else 867 if (curr->active) 868#endif 869 { 870 sk_SSL_CIPHER_push(cipherstack, curr->cipher); 871#ifdef CIPHER_DEBUG 872 printf("<%s>\n",curr->cipher->name); 873#endif 874 } 875 } 876 OPENSSL_free(co_list); /* Not needed any longer */ 877 878 /* 879 * The following passage is a little bit odd. If pointer variables 880 * were supplied to hold STACK_OF(SSL_CIPHER) return information, 881 * the old memory pointed to is free()ed. Then, however, the 882 * cipher_list entry will be assigned just a copy of the returned 883 * cipher stack. For cipher_list_by_id a copy of the cipher stack 884 * will be created. See next comment... 885 */ 886 if (cipher_list != NULL) 887 { 888 if (*cipher_list != NULL) 889 sk_SSL_CIPHER_free(*cipher_list); 890 *cipher_list = cipherstack; 891 } 892 893 if (cipher_list_by_id != NULL) 894 { 895 if (*cipher_list_by_id != NULL) 896 sk_SSL_CIPHER_free(*cipher_list_by_id); 897 *cipher_list_by_id = sk_SSL_CIPHER_dup(cipherstack); 898 } 899 900 /* 901 * Now it is getting really strange. If something failed during 902 * the previous pointer assignment or if one of the pointers was 903 * not requested, the error condition is met. That might be 904 * discussable. The strange thing is however that in this case 905 * the memory "ret" pointed to is "free()ed" and hence the pointer 906 * cipher_list becomes wild. The memory reserved for 907 * cipher_list_by_id however is not "free()ed" and stays intact. 908 */ 909 if ( (cipher_list_by_id == NULL) || 910 (*cipher_list_by_id == NULL) || 911 (cipher_list == NULL) || 912 (*cipher_list == NULL)) 913 { 914 sk_SSL_CIPHER_free(cipherstack); 915 return(NULL); 916 } 917 918 sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp); 919 920 return(cipherstack); 921 } 922 923char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len) 924 { 925 int is_export,pkl,kl; 926 char *ver,*exp_str; 927 char *kx,*au,*enc,*mac; 928 unsigned long alg,alg2,alg_s; 929#ifdef KSSL_DEBUG 930 static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx\n"; 931#else 932 static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n"; 933#endif /* KSSL_DEBUG */ 934 935 alg=cipher->algorithms; 936 alg_s=cipher->algo_strength; 937 alg2=cipher->algorithm2; 938 939 is_export=SSL_C_IS_EXPORT(cipher); 940 pkl=SSL_C_EXPORT_PKEYLENGTH(cipher); 941 kl=SSL_C_EXPORT_KEYLENGTH(cipher); 942 exp_str=is_export?" export":""; 943 944 if (alg & SSL_SSLV2) 945 ver="SSLv2"; 946 else if (alg & SSL_SSLV3) 947 ver="SSLv3"; 948 else 949 ver="unknown"; 950 951 switch (alg&SSL_MKEY_MASK) 952 { 953 case SSL_kRSA: 954 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA"; 955 break; 956 case SSL_kDHr: 957 kx="DH/RSA"; 958 break; 959 case SSL_kDHd: 960 kx="DH/DSS"; 961 break; 962 case SSL_kKRB5: /* VRS */ 963 case SSL_KRB5: /* VRS */ 964 kx="KRB5"; 965 break; 966 case SSL_kFZA: 967 kx="Fortezza"; 968 break; 969 case SSL_kEDH: 970 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH"; 971 break; 972 default: 973 kx="unknown"; 974 } 975 976 switch (alg&SSL_AUTH_MASK) 977 { 978 case SSL_aRSA: 979 au="RSA"; 980 break; 981 case SSL_aDSS: 982 au="DSS"; 983 break; 984 case SSL_aDH: 985 au="DH"; 986 break; 987 case SSL_aKRB5: /* VRS */ 988 case SSL_KRB5: /* VRS */ 989 au="KRB5"; 990 break; 991 case SSL_aFZA: 992 case SSL_aNULL: 993 au="None"; 994 break; 995 default: 996 au="unknown"; 997 break; 998 } 999 1000 switch (alg&SSL_ENC_MASK) 1001 { 1002 case SSL_DES: 1003 enc=(is_export && kl == 5)?"DES(40)":"DES(56)"; 1004 break; 1005 case SSL_3DES: 1006 enc="3DES(168)"; 1007 break; 1008 case SSL_RC4: 1009 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)") 1010 :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)"); 1011 break; 1012 case SSL_RC2: 1013 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)"; 1014 break; 1015 case SSL_IDEA: 1016 enc="IDEA(128)"; 1017 break; 1018 case SSL_eFZA: 1019 enc="Fortezza"; 1020 break; 1021 case SSL_eNULL: 1022 enc="None"; 1023 break; 1024 case SSL_AES: 1025 switch(cipher->strength_bits) 1026 { 1027 case 128: enc="AES(128)"; break; 1028 case 192: enc="AES(192)"; break; 1029 case 256: enc="AES(256)"; break; 1030 default: enc="AES(?""?""?)"; break; 1031 } 1032 break; 1033 default: 1034 enc="unknown"; 1035 break; 1036 } 1037 1038 switch (alg&SSL_MAC_MASK) 1039 { 1040 case SSL_MD5: 1041 mac="MD5"; 1042 break; 1043 case SSL_SHA1: 1044 mac="SHA1"; 1045 break; 1046 default: 1047 mac="unknown"; 1048 break; 1049 } 1050 1051 if (buf == NULL) 1052 { 1053 len=128; 1054 buf=OPENSSL_malloc(len); 1055 if (buf == NULL) return("OPENSSL_malloc Error"); 1056 } 1057 else if (len < 128) 1058 return("Buffer too small"); 1059 1060#ifdef KSSL_DEBUG 1061 BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg); 1062#else 1063 BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str); 1064#endif /* KSSL_DEBUG */ 1065 return(buf); 1066 } 1067 1068char *SSL_CIPHER_get_version(SSL_CIPHER *c) 1069 { 1070 int i; 1071 1072 if (c == NULL) return("(NONE)"); 1073 i=(int)(c->id>>24L); 1074 if (i == 3) 1075 return("TLSv1/SSLv3"); 1076 else if (i == 2) 1077 return("SSLv2"); 1078 else 1079 return("unknown"); 1080 } 1081 1082/* return the actual cipher being used */ 1083const char *SSL_CIPHER_get_name(SSL_CIPHER *c) 1084 { 1085 if (c != NULL) 1086 return(c->name); 1087 return("(NONE)"); 1088 } 1089 1090/* number of bits for symmetric cipher */ 1091int SSL_CIPHER_get_bits(SSL_CIPHER *c, int *alg_bits) 1092 { 1093 int ret=0; 1094 1095 if (c != NULL) 1096 { 1097 if (alg_bits != NULL) *alg_bits = c->alg_bits; 1098 ret = c->strength_bits; 1099 } 1100 return(ret); 1101 } 1102 1103SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n) 1104 { 1105 SSL_COMP *ctmp; 1106 int i,nn; 1107 1108 if ((n == 0) || (sk == NULL)) return(NULL); 1109 nn=sk_SSL_COMP_num(sk); 1110 for (i=0; i<nn; i++) 1111 { 1112 ctmp=sk_SSL_COMP_value(sk,i); 1113 if (ctmp->id == n) 1114 return(ctmp); 1115 } 1116 return(NULL); 1117 } 1118 1119static int sk_comp_cmp(const SSL_COMP * const *a, 1120 const SSL_COMP * const *b) 1121 { 1122 return((*a)->id-(*b)->id); 1123 } 1124 1125STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void) 1126 { 1127 return(ssl_comp_methods); 1128 } 1129 1130int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm) 1131 { 1132 SSL_COMP *comp; 1133 STACK_OF(SSL_COMP) *sk; 1134 1135 if (cm == NULL || cm->type == NID_undef) 1136 return 1; 1137 1138 MemCheck_off(); 1139 comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP)); 1140 comp->id=id; 1141 comp->method=cm; 1142 if (ssl_comp_methods == NULL) 1143 sk=ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp); 1144 else 1145 sk=ssl_comp_methods; 1146 if ((sk == NULL) || !sk_SSL_COMP_push(sk,comp)) 1147 { 1148 MemCheck_on(); 1149 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE); 1150 return(1); 1151 } 1152 else 1153 { 1154 MemCheck_on(); 1155 return(0); 1156 } 1157 } 1158