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