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_AES128_IDX 7 72 #define SSL_ENC_AES256_IDX 8 73 #define SSL_ENC_NUM_IDX 9 74 75 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={ 76 NULL,NULL,NULL,NULL,NULL,NULL, 77 }; 78 79 static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL; 80 81 #define SSL_MD_MD5_IDX 0 82 #define SSL_MD_SHA1_IDX 1 83 #define SSL_MD_NUM_IDX 2 84 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={ 85 NULL,NULL, 86 }; 87 88 #define CIPHER_ADD 1 89 #define CIPHER_KILL 2 90 #define CIPHER_DEL 3 91 #define CIPHER_ORD 4 92 #define CIPHER_SPECIAL 5 93 94 typedef struct cipher_order_st 95 { 96 SSL_CIPHER *cipher; 97 int active; 98 int dead; 99 struct cipher_order_st *next,*prev; 100 } CIPHER_ORDER; 101 102 static const SSL_CIPHER cipher_aliases[]={ 103 /* Don't include eNULL unless specifically enabled. */ 104 {0,SSL_TXT_ALL, 0,SSL_ALL & ~SSL_eNULL, SSL_ALL ,0,0,0,SSL_ALL,SSL_ALL}, /* must be first */ 105 {0,SSL_TXT_CMPALL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0}, /* COMPLEMENT OF ALL */ 106 {0,SSL_TXT_CMPDEF,0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK,0}, 107 {0,SSL_TXT_kKRB5,0,SSL_kKRB5,0,0,0,0,SSL_MKEY_MASK,0}, /* VRS Kerberos5 */ 108 {0,SSL_TXT_kRSA,0,SSL_kRSA, 0,0,0,0,SSL_MKEY_MASK,0}, 109 {0,SSL_TXT_kDHr,0,SSL_kDHr, 0,0,0,0,SSL_MKEY_MASK,0}, 110 {0,SSL_TXT_kDHd,0,SSL_kDHd, 0,0,0,0,SSL_MKEY_MASK,0}, 111 {0,SSL_TXT_kEDH,0,SSL_kEDH, 0,0,0,0,SSL_MKEY_MASK,0}, 112 {0,SSL_TXT_kFZA,0,SSL_kFZA, 0,0,0,0,SSL_MKEY_MASK,0}, 113 {0,SSL_TXT_DH, 0,SSL_DH, 0,0,0,0,SSL_MKEY_MASK,0}, 114 {0,SSL_TXT_EDH, 0,SSL_EDH, 0,0,0,0,SSL_MKEY_MASK|SSL_AUTH_MASK,0}, 115 116 {0,SSL_TXT_aKRB5,0,SSL_aKRB5,0,0,0,0,SSL_AUTH_MASK,0}, /* VRS Kerberos5 */ 117 {0,SSL_TXT_aRSA,0,SSL_aRSA, 0,0,0,0,SSL_AUTH_MASK,0}, 118 {0,SSL_TXT_aDSS,0,SSL_aDSS, 0,0,0,0,SSL_AUTH_MASK,0}, 119 {0,SSL_TXT_aFZA,0,SSL_aFZA, 0,0,0,0,SSL_AUTH_MASK,0}, 120 {0,SSL_TXT_aNULL,0,SSL_aNULL,0,0,0,0,SSL_AUTH_MASK,0}, 121 {0,SSL_TXT_aDH, 0,SSL_aDH, 0,0,0,0,SSL_AUTH_MASK,0}, 122 {0,SSL_TXT_DSS, 0,SSL_DSS, 0,0,0,0,SSL_AUTH_MASK,0}, 123 124 {0,SSL_TXT_DES, 0,SSL_DES, 0,0,0,0,SSL_ENC_MASK,0}, 125 {0,SSL_TXT_3DES,0,SSL_3DES, 0,0,0,0,SSL_ENC_MASK,0}, 126 {0,SSL_TXT_RC4, 0,SSL_RC4, 0,0,0,0,SSL_ENC_MASK,0}, 127 {0,SSL_TXT_RC2, 0,SSL_RC2, 0,0,0,0,SSL_ENC_MASK,0}, 128 {0,SSL_TXT_IDEA,0,SSL_IDEA, 0,0,0,0,SSL_ENC_MASK,0}, 129 {0,SSL_TXT_eNULL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0}, 130 {0,SSL_TXT_eFZA,0,SSL_eFZA, 0,0,0,0,SSL_ENC_MASK,0}, 131 {0,SSL_TXT_AES, 0,SSL_AES, 0,0,0,0,SSL_ENC_MASK,0}, 132 133 {0,SSL_TXT_MD5, 0,SSL_MD5, 0,0,0,0,SSL_MAC_MASK,0}, 134 {0,SSL_TXT_SHA1,0,SSL_SHA1, 0,0,0,0,SSL_MAC_MASK,0}, 135 {0,SSL_TXT_SHA, 0,SSL_SHA, 0,0,0,0,SSL_MAC_MASK,0}, 136 137 {0,SSL_TXT_NULL,0,SSL_NULL, 0,0,0,0,SSL_ENC_MASK,0}, 138 {0,SSL_TXT_KRB5,0,SSL_KRB5, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0}, 139 {0,SSL_TXT_RSA, 0,SSL_RSA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0}, 140 {0,SSL_TXT_ADH, 0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0}, 141 {0,SSL_TXT_FZA, 0,SSL_FZA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK,0}, 142 143 {0,SSL_TXT_SSLV2, 0,SSL_SSLV2, 0,0,0,0,SSL_SSL_MASK,0}, 144 {0,SSL_TXT_SSLV3, 0,SSL_SSLV3, 0,0,0,0,SSL_SSL_MASK,0}, 145 {0,SSL_TXT_TLSV1, 0,SSL_TLSV1, 0,0,0,0,SSL_SSL_MASK,0}, 146 147 {0,SSL_TXT_EXP ,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK}, 148 {0,SSL_TXT_EXPORT,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK}, 149 {0,SSL_TXT_EXP40, 0, 0, SSL_EXP40, 0,0,0,0,SSL_STRONG_MASK}, 150 {0,SSL_TXT_EXP56, 0, 0, SSL_EXP56, 0,0,0,0,SSL_STRONG_MASK}, 151 {0,SSL_TXT_LOW, 0, 0, SSL_LOW, 0,0,0,0,SSL_STRONG_MASK}, 152 {0,SSL_TXT_MEDIUM,0, 0,SSL_MEDIUM, 0,0,0,0,SSL_STRONG_MASK}, 153 {0,SSL_TXT_HIGH, 0, 0, SSL_HIGH, 0,0,0,0,SSL_STRONG_MASK}, 154 }; 155 156 static int init_ciphers=1; 157 158 static void load_ciphers(void) 159 { 160 init_ciphers=0; 161 ssl_cipher_methods[SSL_ENC_DES_IDX]= 162 EVP_get_cipherbyname(SN_des_cbc); 163 ssl_cipher_methods[SSL_ENC_3DES_IDX]= 164 EVP_get_cipherbyname(SN_des_ede3_cbc); 165 ssl_cipher_methods[SSL_ENC_RC4_IDX]= 166 EVP_get_cipherbyname(SN_rc4); 167 ssl_cipher_methods[SSL_ENC_RC2_IDX]= 168 EVP_get_cipherbyname(SN_rc2_cbc); 169 ssl_cipher_methods[SSL_ENC_IDEA_IDX]= 170 EVP_get_cipherbyname(SN_idea_cbc); 171 ssl_cipher_methods[SSL_ENC_AES128_IDX]= 172 EVP_get_cipherbyname(SN_aes_128_cbc); 173 ssl_cipher_methods[SSL_ENC_AES256_IDX]= 174 EVP_get_cipherbyname(SN_aes_256_cbc); 175 176 ssl_digest_methods[SSL_MD_MD5_IDX]= 177 EVP_get_digestbyname(SN_md5); 178 ssl_digest_methods[SSL_MD_SHA1_IDX]= 179 EVP_get_digestbyname(SN_sha1); 180 } 181 182 int ssl_cipher_get_evp(SSL_SESSION *s, const EVP_CIPHER **enc, 183 const EVP_MD **md, SSL_COMP **comp) 184 { 185 int i; 186 SSL_CIPHER *c; 187 188 c=s->cipher; 189 if (c == NULL) return(0); 190 if (comp != NULL) 191 { 192 SSL_COMP ctmp; 193 194 if (s->compress_meth == 0) 195 *comp=NULL; 196 else if (ssl_comp_methods == NULL) 197 { 198 /* bad */ 199 *comp=NULL; 200 } 201 else 202 { 203 204 ctmp.id=s->compress_meth; 205 i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp); 206 if (i >= 0) 207 *comp=sk_SSL_COMP_value(ssl_comp_methods,i); 208 else 209 *comp=NULL; 210 } 211 } 212 213 if ((enc == NULL) || (md == NULL)) return(0); 214 215 switch (c->algorithms & SSL_ENC_MASK) 216 { 217 case SSL_DES: 218 i=SSL_ENC_DES_IDX; 219 break; 220 case SSL_3DES: 221 i=SSL_ENC_3DES_IDX; 222 break; 223 case SSL_RC4: 224 i=SSL_ENC_RC4_IDX; 225 break; 226 case SSL_RC2: 227 i=SSL_ENC_RC2_IDX; 228 break; 229 case SSL_IDEA: 230 i=SSL_ENC_IDEA_IDX; 231 break; 232 case SSL_eNULL: 233 i=SSL_ENC_NULL_IDX; 234 break; 235 case SSL_AES: 236 switch(c->alg_bits) 237 { 238 case 128: i=SSL_ENC_AES128_IDX; break; 239 case 256: i=SSL_ENC_AES256_IDX; break; 240 default: i=-1; break; 241 } 242 break; 243 default: 244 i= -1; 245 break; 246 } 247 248 if ((i < 0) || (i > SSL_ENC_NUM_IDX)) 249 *enc=NULL; 250 else 251 { 252 if (i == SSL_ENC_NULL_IDX) 253 *enc=EVP_enc_null(); 254 else 255 *enc=ssl_cipher_methods[i]; 256 } 257 258 switch (c->algorithms & SSL_MAC_MASK) 259 { 260 case SSL_MD5: 261 i=SSL_MD_MD5_IDX; 262 break; 263 case SSL_SHA1: 264 i=SSL_MD_SHA1_IDX; 265 break; 266 default: 267 i= -1; 268 break; 269 } 270 if ((i < 0) || (i > SSL_MD_NUM_IDX)) 271 *md=NULL; 272 else 273 *md=ssl_digest_methods[i]; 274 275 if ((*enc != NULL) && (*md != NULL)) 276 return(1); 277 else 278 return(0); 279 } 280 281 #define ITEM_SEP(a) \ 282 (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ',')) 283 284 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr, 285 CIPHER_ORDER **tail) 286 { 287 if (curr == *tail) return; 288 if (curr == *head) 289 *head=curr->next; 290 if (curr->prev != NULL) 291 curr->prev->next=curr->next; 292 if (curr->next != NULL) /* should always be true */ 293 curr->next->prev=curr->prev; 294 (*tail)->next=curr; 295 curr->prev= *tail; 296 curr->next=NULL; 297 *tail=curr; 298 } 299 300 static unsigned long ssl_cipher_get_disabled(void) 301 { 302 unsigned long mask; 303 304 mask = SSL_kFZA; 305 #ifdef OPENSSL_NO_RSA 306 mask |= SSL_aRSA|SSL_kRSA; 307 #endif 308 #ifdef OPENSSL_NO_DSA 309 mask |= SSL_aDSS; 310 #endif 311 #ifdef OPENSSL_NO_DH 312 mask |= SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH; 313 #endif 314 #ifdef OPENSSL_NO_KRB5 315 mask |= SSL_kKRB5|SSL_aKRB5; 316 #endif 317 318 #ifdef SSL_FORBID_ENULL 319 mask |= SSL_eNULL; 320 #endif 321 322 mask |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0; 323 mask |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0; 324 mask |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0; 325 mask |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0; 326 mask |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0; 327 mask |= (ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL) ? SSL_eFZA:0; 328 mask |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES:0; 329 330 mask |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0; 331 mask |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0; 332 333 return(mask); 334 } 335 336 static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method, 337 int num_of_ciphers, unsigned long mask, CIPHER_ORDER *list, 338 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 339 { 340 int i, list_num; 341 SSL_CIPHER *c; 342 343 /* 344 * We have num_of_ciphers descriptions compiled in, depending on the 345 * method selected (SSLv2 and/or SSLv3, TLSv1 etc). 346 * These will later be sorted in a linked list with at most num 347 * entries. 348 */ 349 350 /* Get the initial list of ciphers */ 351 list_num = 0; /* actual count of ciphers */ 352 for (i = 0; i < num_of_ciphers; i++) 353 { 354 c = ssl_method->get_cipher(i); 355 /* drop those that use any of that is not available */ 356 if ((c != NULL) && c->valid && !(c->algorithms & mask)) 357 { 358 list[list_num].cipher = c; 359 list[list_num].next = NULL; 360 list[list_num].prev = NULL; 361 list[list_num].active = 0; 362 list_num++; 363 #ifdef KSSL_DEBUG 364 printf("\t%d: %s %lx %lx\n",i,c->name,c->id,c->algorithms); 365 #endif /* KSSL_DEBUG */ 366 /* 367 if (!sk_push(ca_list,(char *)c)) goto err; 368 */ 369 } 370 } 371 372 /* 373 * Prepare linked list from list entries 374 */ 375 for (i = 1; i < list_num - 1; i++) 376 { 377 list[i].prev = &(list[i-1]); 378 list[i].next = &(list[i+1]); 379 } 380 if (list_num > 0) 381 { 382 (*head_p) = &(list[0]); 383 (*head_p)->prev = NULL; 384 (*head_p)->next = &(list[1]); 385 (*tail_p) = &(list[list_num - 1]); 386 (*tail_p)->prev = &(list[list_num - 2]); 387 (*tail_p)->next = NULL; 388 } 389 } 390 391 static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list, 392 int num_of_group_aliases, unsigned long mask, 393 CIPHER_ORDER *head) 394 { 395 CIPHER_ORDER *ciph_curr; 396 SSL_CIPHER **ca_curr; 397 int i; 398 399 /* 400 * First, add the real ciphers as already collected 401 */ 402 ciph_curr = head; 403 ca_curr = ca_list; 404 while (ciph_curr != NULL) 405 { 406 *ca_curr = ciph_curr->cipher; 407 ca_curr++; 408 ciph_curr = ciph_curr->next; 409 } 410 411 /* 412 * Now we add the available ones from the cipher_aliases[] table. 413 * They represent either an algorithm, that must be fully 414 * supported (not match any bit in mask) or represent a cipher 415 * strength value (will be added in any case because algorithms=0). 416 */ 417 for (i = 0; i < num_of_group_aliases; i++) 418 { 419 if ((i == 0) || /* always fetch "ALL" */ 420 !(cipher_aliases[i].algorithms & mask)) 421 { 422 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i); 423 ca_curr++; 424 } 425 } 426 427 *ca_curr = NULL; /* end of list */ 428 } 429 430 static void ssl_cipher_apply_rule(unsigned long algorithms, unsigned long mask, 431 unsigned long algo_strength, unsigned long mask_strength, 432 int rule, int strength_bits, CIPHER_ORDER *list, 433 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p) 434 { 435 CIPHER_ORDER *head, *tail, *curr, *curr2, *tail2; 436 SSL_CIPHER *cp; 437 unsigned long ma, ma_s; 438 439 #ifdef CIPHER_DEBUG 440 printf("Applying rule %d with %08lx %08lx %08lx %08lx (%d)\n", 441 rule, algorithms, mask, algo_strength, mask_strength, 442 strength_bits); 443 #endif 444 445 curr = head = *head_p; 446 curr2 = head; 447 tail2 = tail = *tail_p; 448 for (;;) 449 { 450 if ((curr == NULL) || (curr == tail2)) break; 451 curr = curr2; 452 curr2 = curr->next; 453 454 cp = curr->cipher; 455 456 /* 457 * Selection criteria is either the number of strength_bits 458 * or the algorithm used. 459 */ 460 if (strength_bits == -1) 461 { 462 ma = mask & cp->algorithms; 463 ma_s = mask_strength & cp->algo_strength; 464 465 #ifdef CIPHER_DEBUG 466 printf("\nName: %s:\nAlgo = %08lx Algo_strength = %08lx\nMask = %08lx Mask_strength %08lx\n", cp->name, cp->algorithms, cp->algo_strength, mask, mask_strength); 467 printf("ma = %08lx ma_s %08lx, ma&algo=%08lx, ma_s&algos=%08lx\n", ma, ma_s, ma&algorithms, ma_s&algo_strength); 468 #endif 469 /* 470 * Select: if none of the mask bit was met from the 471 * cipher or not all of the bits were met, the 472 * selection does not apply. 473 */ 474 if (((ma == 0) && (ma_s == 0)) || 475 ((ma & algorithms) != ma) || 476 ((ma_s & algo_strength) != ma_s)) 477 continue; /* does not apply */ 478 } 479 else if (strength_bits != cp->strength_bits) 480 continue; /* does not apply */ 481 482 #ifdef CIPHER_DEBUG 483 printf("Action = %d\n", rule); 484 #endif 485 486 /* add the cipher if it has not been added yet. */ 487 if (rule == CIPHER_ADD) 488 { 489 if (!curr->active) 490 { 491 ll_append_tail(&head, curr, &tail); 492 curr->active = 1; 493 } 494 } 495 /* Move the added cipher to this location */ 496 else if (rule == CIPHER_ORD) 497 { 498 if (curr->active) 499 { 500 ll_append_tail(&head, curr, &tail); 501 } 502 } 503 else if (rule == CIPHER_DEL) 504 curr->active = 0; 505 else if (rule == CIPHER_KILL) 506 { 507 if (head == curr) 508 head = curr->next; 509 else 510 curr->prev->next = curr->next; 511 if (tail == curr) 512 tail = curr->prev; 513 curr->active = 0; 514 if (curr->next != NULL) 515 curr->next->prev = curr->prev; 516 if (curr->prev != NULL) 517 curr->prev->next = curr->next; 518 curr->next = NULL; 519 curr->prev = NULL; 520 } 521 } 522 523 *head_p = head; 524 *tail_p = tail; 525 } 526 527 static int ssl_cipher_strength_sort(CIPHER_ORDER *list, CIPHER_ORDER **head_p, 528 CIPHER_ORDER **tail_p) 529 { 530 int max_strength_bits, i, *number_uses; 531 CIPHER_ORDER *curr; 532 533 /* 534 * This routine sorts the ciphers with descending strength. The sorting 535 * must keep the pre-sorted sequence, so we apply the normal sorting 536 * routine as '+' movement to the end of the list. 537 */ 538 max_strength_bits = 0; 539 curr = *head_p; 540 while (curr != NULL) 541 { 542 if (curr->active && 543 (curr->cipher->strength_bits > max_strength_bits)) 544 max_strength_bits = curr->cipher->strength_bits; 545 curr = curr->next; 546 } 547 548 number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int)); 549 if (!number_uses) 550 { 551 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE); 552 return(0); 553 } 554 memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int)); 555 556 /* 557 * Now find the strength_bits values actually used 558 */ 559 curr = *head_p; 560 while (curr != NULL) 561 { 562 if (curr->active) 563 number_uses[curr->cipher->strength_bits]++; 564 curr = curr->next; 565 } 566 /* 567 * Go through the list of used strength_bits values in descending 568 * order. 569 */ 570 for (i = max_strength_bits; i >= 0; i--) 571 if (number_uses[i] > 0) 572 ssl_cipher_apply_rule(0, 0, 0, 0, CIPHER_ORD, i, 573 list, head_p, tail_p); 574 575 OPENSSL_free(number_uses); 576 return(1); 577 } 578 579 static int ssl_cipher_process_rulestr(const char *rule_str, 580 CIPHER_ORDER *list, CIPHER_ORDER **head_p, 581 CIPHER_ORDER **tail_p, SSL_CIPHER **ca_list) 582 { 583 unsigned long algorithms, mask, algo_strength, mask_strength; 584 const char *l, *start, *buf; 585 int j, multi, found, rule, retval, ok, buflen; 586 char ch; 587 588 retval = 1; 589 l = rule_str; 590 for (;;) 591 { 592 ch = *l; 593 594 if (ch == '\0') 595 break; /* done */ 596 if (ch == '-') 597 { rule = CIPHER_DEL; l++; } 598 else if (ch == '+') 599 { rule = CIPHER_ORD; l++; } 600 else if (ch == '!') 601 { rule = CIPHER_KILL; l++; } 602 else if (ch == '@') 603 { rule = CIPHER_SPECIAL; l++; } 604 else 605 { rule = CIPHER_ADD; } 606 607 if (ITEM_SEP(ch)) 608 { 609 l++; 610 continue; 611 } 612 613 algorithms = mask = algo_strength = mask_strength = 0; 614 615 start=l; 616 for (;;) 617 { 618 ch = *l; 619 buf = l; 620 buflen = 0; 621 #ifndef CHARSET_EBCDIC 622 while ( ((ch >= 'A') && (ch <= 'Z')) || 623 ((ch >= '0') && (ch <= '9')) || 624 ((ch >= 'a') && (ch <= 'z')) || 625 (ch == '-')) 626 #else 627 while ( isalnum(ch) || (ch == '-')) 628 #endif 629 { 630 ch = *(++l); 631 buflen++; 632 } 633 634 if (buflen == 0) 635 { 636 /* 637 * We hit something we cannot deal with, 638 * it is no command or separator nor 639 * alphanumeric, so we call this an error. 640 */ 641 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR, 642 SSL_R_INVALID_COMMAND); 643 retval = found = 0; 644 l++; 645 break; 646 } 647 648 if (rule == CIPHER_SPECIAL) 649 { 650 found = 0; /* unused -- avoid compiler warning */ 651 break; /* special treatment */ 652 } 653 654 /* check for multi-part specification */ 655 if (ch == '+') 656 { 657 multi=1; 658 l++; 659 } 660 else 661 multi=0; 662 663 /* 664 * Now search for the cipher alias in the ca_list. Be careful 665 * with the strncmp, because the "buflen" limitation 666 * will make the rule "ADH:SOME" and the cipher 667 * "ADH-MY-CIPHER" look like a match for buflen=3. 668 * So additionally check whether the cipher name found 669 * has the correct length. We can save a strlen() call: 670 * just checking for the '\0' at the right place is 671 * sufficient, we have to strncmp() anyway. 672 */ 673 j = found = 0; 674 while (ca_list[j]) 675 { 676 if ((ca_list[j]->name[buflen] == '\0') && 677 !strncmp(buf, ca_list[j]->name, buflen)) 678 { 679 found = 1; 680 break; 681 } 682 else 683 j++; 684 } 685 if (!found) 686 break; /* ignore this entry */ 687 688 algorithms |= ca_list[j]->algorithms; 689 mask |= ca_list[j]->mask; 690 algo_strength |= ca_list[j]->algo_strength; 691 mask_strength |= ca_list[j]->mask_strength; 692 693 if (!multi) break; 694 } 695 696 /* 697 * Ok, we have the rule, now apply it 698 */ 699 if (rule == CIPHER_SPECIAL) 700 { /* special command */ 701 ok = 0; 702 if ((buflen == 8) && 703 !strncmp(buf, "STRENGTH", 8)) 704 ok = ssl_cipher_strength_sort(list, 705 head_p, tail_p); 706 else 707 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR, 708 SSL_R_INVALID_COMMAND); 709 if (ok == 0) 710 retval = 0; 711 /* 712 * We do not support any "multi" options 713 * together with "@", so throw away the 714 * rest of the command, if any left, until 715 * end or ':' is found. 716 */ 717 while ((*l != '\0') && ITEM_SEP(*l)) 718 l++; 719 } 720 else if (found) 721 { 722 ssl_cipher_apply_rule(algorithms, mask, 723 algo_strength, mask_strength, rule, -1, 724 list, head_p, tail_p); 725 } 726 else 727 { 728 while ((*l != '\0') && ITEM_SEP(*l)) 729 l++; 730 } 731 if (*l == '\0') break; /* done */ 732 } 733 734 return(retval); 735 } 736 737 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method, 738 STACK_OF(SSL_CIPHER) **cipher_list, 739 STACK_OF(SSL_CIPHER) **cipher_list_by_id, 740 const char *rule_str) 741 { 742 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases; 743 unsigned long disabled_mask; 744 STACK_OF(SSL_CIPHER) *cipherstack; 745 const char *rule_p; 746 CIPHER_ORDER *list = NULL, *head = NULL, *tail = NULL, *curr; 747 SSL_CIPHER **ca_list = NULL; 748 749 /* 750 * Return with error if nothing to do. 751 */ 752 if (rule_str == NULL) return(NULL); 753 754 if (init_ciphers) 755 { 756 CRYPTO_w_lock(CRYPTO_LOCK_SSL); 757 if (init_ciphers) load_ciphers(); 758 CRYPTO_w_unlock(CRYPTO_LOCK_SSL); 759 } 760 761 /* 762 * To reduce the work to do we only want to process the compiled 763 * in algorithms, so we first get the mask of disabled ciphers. 764 */ 765 disabled_mask = ssl_cipher_get_disabled(); 766 767 /* 768 * Now we have to collect the available ciphers from the compiled 769 * in ciphers. We cannot get more than the number compiled in, so 770 * it is used for allocation. 771 */ 772 num_of_ciphers = ssl_method->num_ciphers(); 773 #ifdef KSSL_DEBUG 774 printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers); 775 #endif /* KSSL_DEBUG */ 776 list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers); 777 if (list == NULL) 778 { 779 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE); 780 return(NULL); /* Failure */ 781 } 782 783 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, disabled_mask, 784 list, &head, &tail); 785 786 /* 787 * We also need cipher aliases for selecting based on the rule_str. 788 * There might be two types of entries in the rule_str: 1) names 789 * of ciphers themselves 2) aliases for groups of ciphers. 790 * For 1) we need the available ciphers and for 2) the cipher 791 * groups of cipher_aliases added together in one list (otherwise 792 * we would be happy with just the cipher_aliases table). 793 */ 794 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER); 795 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1; 796 ca_list = 797 (SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max); 798 if (ca_list == NULL) 799 { 800 OPENSSL_free(list); 801 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE); 802 return(NULL); /* Failure */ 803 } 804 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mask, 805 head); 806 807 /* 808 * If the rule_string begins with DEFAULT, apply the default rule 809 * before using the (possibly available) additional rules. 810 */ 811 ok = 1; 812 rule_p = rule_str; 813 if (strncmp(rule_str,"DEFAULT",7) == 0) 814 { 815 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST, 816 list, &head, &tail, ca_list); 817 rule_p += 7; 818 if (*rule_p == ':') 819 rule_p++; 820 } 821 822 if (ok && (strlen(rule_p) > 0)) 823 ok = ssl_cipher_process_rulestr(rule_p, list, &head, &tail, 824 ca_list); 825 826 OPENSSL_free(ca_list); /* Not needed anymore */ 827 828 if (!ok) 829 { /* Rule processing failure */ 830 OPENSSL_free(list); 831 return(NULL); 832 } 833 /* 834 * Allocate new "cipherstack" for the result, return with error 835 * if we cannot get one. 836 */ 837 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) 838 { 839 OPENSSL_free(list); 840 return(NULL); 841 } 842 843 /* 844 * The cipher selection for the list is done. The ciphers are added 845 * to the resulting precedence to the STACK_OF(SSL_CIPHER). 846 */ 847 for (curr = head; curr != NULL; curr = curr->next) 848 { 849 if (curr->active) 850 { 851 sk_SSL_CIPHER_push(cipherstack, curr->cipher); 852 #ifdef CIPHER_DEBUG 853 printf("<%s>\n",curr->cipher->name); 854 #endif 855 } 856 } 857 OPENSSL_free(list); /* Not needed any longer */ 858 859 /* 860 * The following passage is a little bit odd. If pointer variables 861 * were supplied to hold STACK_OF(SSL_CIPHER) return information, 862 * the old memory pointed to is free()ed. Then, however, the 863 * cipher_list entry will be assigned just a copy of the returned 864 * cipher stack. For cipher_list_by_id a copy of the cipher stack 865 * will be created. See next comment... 866 */ 867 if (cipher_list != NULL) 868 { 869 if (*cipher_list != NULL) 870 sk_SSL_CIPHER_free(*cipher_list); 871 *cipher_list = cipherstack; 872 } 873 874 if (cipher_list_by_id != NULL) 875 { 876 if (*cipher_list_by_id != NULL) 877 sk_SSL_CIPHER_free(*cipher_list_by_id); 878 *cipher_list_by_id = sk_SSL_CIPHER_dup(cipherstack); 879 } 880 881 /* 882 * Now it is getting really strange. If something failed during 883 * the previous pointer assignment or if one of the pointers was 884 * not requested, the error condition is met. That might be 885 * discussable. The strange thing is however that in this case 886 * the memory "ret" pointed to is "free()ed" and hence the pointer 887 * cipher_list becomes wild. The memory reserved for 888 * cipher_list_by_id however is not "free()ed" and stays intact. 889 */ 890 if ( (cipher_list_by_id == NULL) || 891 (*cipher_list_by_id == NULL) || 892 (cipher_list == NULL) || 893 (*cipher_list == NULL)) 894 { 895 sk_SSL_CIPHER_free(cipherstack); 896 return(NULL); 897 } 898 899 sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp); 900 901 return(cipherstack); 902 } 903 904 char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len) 905 { 906 int is_export,pkl,kl; 907 char *ver,*exp; 908 char *kx,*au,*enc,*mac; 909 unsigned long alg,alg2,alg_s; 910 #ifdef KSSL_DEBUG 911 static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx\n"; 912 #else 913 static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n"; 914 #endif /* KSSL_DEBUG */ 915 916 alg=cipher->algorithms; 917 alg_s=cipher->algo_strength; 918 alg2=cipher->algorithm2; 919 920 is_export=SSL_C_IS_EXPORT(cipher); 921 pkl=SSL_C_EXPORT_PKEYLENGTH(cipher); 922 kl=SSL_C_EXPORT_KEYLENGTH(cipher); 923 exp=is_export?" export":""; 924 925 if (alg & SSL_SSLV2) 926 ver="SSLv2"; 927 else if (alg & SSL_SSLV3) 928 ver="SSLv3"; 929 else 930 ver="unknown"; 931 932 switch (alg&SSL_MKEY_MASK) 933 { 934 case SSL_kRSA: 935 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA"; 936 break; 937 case SSL_kDHr: 938 kx="DH/RSA"; 939 break; 940 case SSL_kDHd: 941 kx="DH/DSS"; 942 break; 943 case SSL_kKRB5: /* VRS */ 944 case SSL_KRB5: /* VRS */ 945 kx="KRB5"; 946 break; 947 case SSL_kFZA: 948 kx="Fortezza"; 949 break; 950 case SSL_kEDH: 951 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH"; 952 break; 953 default: 954 kx="unknown"; 955 } 956 957 switch (alg&SSL_AUTH_MASK) 958 { 959 case SSL_aRSA: 960 au="RSA"; 961 break; 962 case SSL_aDSS: 963 au="DSS"; 964 break; 965 case SSL_aDH: 966 au="DH"; 967 break; 968 case SSL_aKRB5: /* VRS */ 969 case SSL_KRB5: /* VRS */ 970 au="KRB5"; 971 break; 972 case SSL_aFZA: 973 case SSL_aNULL: 974 au="None"; 975 break; 976 default: 977 au="unknown"; 978 break; 979 } 980 981 switch (alg&SSL_ENC_MASK) 982 { 983 case SSL_DES: 984 enc=(is_export && kl == 5)?"DES(40)":"DES(56)"; 985 break; 986 case SSL_3DES: 987 enc="3DES(168)"; 988 break; 989 case SSL_RC4: 990 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)") 991 :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)"); 992 break; 993 case SSL_RC2: 994 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)"; 995 break; 996 case SSL_IDEA: 997 enc="IDEA(128)"; 998 break; 999 case SSL_eFZA: 1000 enc="Fortezza"; 1001 break; 1002 case SSL_eNULL: 1003 enc="None"; 1004 break; 1005 case SSL_AES: 1006 switch(cipher->strength_bits) 1007 { 1008 case 128: enc="AES(128)"; break; 1009 case 192: enc="AES(192)"; break; 1010 case 256: enc="AES(256)"; break; 1011 default: enc="AES(?""?""?)"; break; 1012 } 1013 break; 1014 default: 1015 enc="unknown"; 1016 break; 1017 } 1018 1019 switch (alg&SSL_MAC_MASK) 1020 { 1021 case SSL_MD5: 1022 mac="MD5"; 1023 break; 1024 case SSL_SHA1: 1025 mac="SHA1"; 1026 break; 1027 default: 1028 mac="unknown"; 1029 break; 1030 } 1031 1032 if (buf == NULL) 1033 { 1034 len=128; 1035 buf=OPENSSL_malloc(len); 1036 if (buf == NULL) return("OPENSSL_malloc Error"); 1037 } 1038 else if (len < 128) 1039 return("Buffer too small"); 1040 1041 #ifdef KSSL_DEBUG 1042 BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp,alg); 1043 #else 1044 BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp); 1045 #endif /* KSSL_DEBUG */ 1046 return(buf); 1047 } 1048 1049 char *SSL_CIPHER_get_version(SSL_CIPHER *c) 1050 { 1051 int i; 1052 1053 if (c == NULL) return("(NONE)"); 1054 i=(int)(c->id>>24L); 1055 if (i == 3) 1056 return("TLSv1/SSLv3"); 1057 else if (i == 2) 1058 return("SSLv2"); 1059 else 1060 return("unknown"); 1061 } 1062 1063 /* return the actual cipher being used */ 1064 const char *SSL_CIPHER_get_name(SSL_CIPHER *c) 1065 { 1066 if (c != NULL) 1067 return(c->name); 1068 return("(NONE)"); 1069 } 1070 1071 /* number of bits for symmetric cipher */ 1072 int SSL_CIPHER_get_bits(SSL_CIPHER *c, int *alg_bits) 1073 { 1074 int ret=0; 1075 1076 if (c != NULL) 1077 { 1078 if (alg_bits != NULL) *alg_bits = c->alg_bits; 1079 ret = c->strength_bits; 1080 } 1081 return(ret); 1082 } 1083 1084 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n) 1085 { 1086 SSL_COMP *ctmp; 1087 int i,nn; 1088 1089 if ((n == 0) || (sk == NULL)) return(NULL); 1090 nn=sk_SSL_COMP_num(sk); 1091 for (i=0; i<nn; i++) 1092 { 1093 ctmp=sk_SSL_COMP_value(sk,i); 1094 if (ctmp->id == n) 1095 return(ctmp); 1096 } 1097 return(NULL); 1098 } 1099 1100 static int sk_comp_cmp(const SSL_COMP * const *a, 1101 const SSL_COMP * const *b) 1102 { 1103 return((*a)->id-(*b)->id); 1104 } 1105 1106 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void) 1107 { 1108 return(ssl_comp_methods); 1109 } 1110 1111 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm) 1112 { 1113 SSL_COMP *comp; 1114 STACK_OF(SSL_COMP) *sk; 1115 1116 if (cm == NULL || cm->type == NID_undef) 1117 return 1; 1118 1119 MemCheck_off(); 1120 comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP)); 1121 comp->id=id; 1122 comp->method=cm; 1123 if (ssl_comp_methods == NULL) 1124 sk=ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp); 1125 else 1126 sk=ssl_comp_methods; 1127 if ((sk == NULL) || !sk_SSL_COMP_push(sk,comp)) 1128 { 1129 MemCheck_on(); 1130 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE); 1131 return(0); 1132 } 1133 else 1134 { 1135 MemCheck_on(); 1136 return(1); 1137 } 1138 } 1139