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 76 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={ 77 NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL 78 }; 79 80 static 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 85 static 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 95 typedef 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; 102 103 static 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 }; 159 160 static int init_ciphers=1; 161 162 static 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 } 189 190 int ssl_cipher_get_evp(const 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) == ',')) 291 292 static 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 } 307 308 static 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 } 343 344 static 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 } 403 404 static 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 } 442 443 static 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 } 539 540 static 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 } 592 593 static 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 /* New algorithms: 704 * 1 - any old restrictions apply outside new mask 705 * 2 - any new restrictions apply outside old mask 706 * 3 - enforce old & new where masks intersect 707 */ 708 algorithms = (algorithms & ~ca_list[j]->mask) | /* 1 */ 709 (ca_list[j]->algorithms & ~mask) | /* 2 */ 710 (algorithms & ca_list[j]->algorithms); /* 3 */ 711 mask |= ca_list[j]->mask; 712 algo_strength = (algo_strength & ~ca_list[j]->mask_strength) | 713 (ca_list[j]->algo_strength & ~mask_strength) | 714 (algo_strength & ca_list[j]->algo_strength); 715 mask_strength |= ca_list[j]->mask_strength; 716 717 if (!multi) break; 718 } 719 720 /* 721 * Ok, we have the rule, now apply it 722 */ 723 if (rule == CIPHER_SPECIAL) 724 { /* special command */ 725 ok = 0; 726 if ((buflen == 8) && 727 !strncmp(buf, "STRENGTH", 8)) 728 ok = ssl_cipher_strength_sort(co_list, 729 head_p, tail_p); 730 else 731 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR, 732 SSL_R_INVALID_COMMAND); 733 if (ok == 0) 734 retval = 0; 735 /* 736 * We do not support any "multi" options 737 * together with "@", so throw away the 738 * rest of the command, if any left, until 739 * end or ':' is found. 740 */ 741 while ((*l != '\0') && ITEM_SEP(*l)) 742 l++; 743 } 744 else if (found) 745 { 746 ssl_cipher_apply_rule(algorithms, mask, 747 algo_strength, mask_strength, rule, -1, 748 co_list, head_p, tail_p); 749 } 750 else 751 { 752 while ((*l != '\0') && ITEM_SEP(*l)) 753 l++; 754 } 755 if (*l == '\0') break; /* done */ 756 } 757 758 return(retval); 759 } 760 761 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method, 762 STACK_OF(SSL_CIPHER) **cipher_list, 763 STACK_OF(SSL_CIPHER) **cipher_list_by_id, 764 const char *rule_str) 765 { 766 int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases; 767 unsigned long disabled_mask; 768 STACK_OF(SSL_CIPHER) *cipherstack, *tmp_cipher_list; 769 const char *rule_p; 770 CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr; 771 SSL_CIPHER **ca_list = NULL; 772 773 /* 774 * Return with error if nothing to do. 775 */ 776 if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == NULL) 777 return NULL; 778 779 if (init_ciphers) 780 { 781 CRYPTO_w_lock(CRYPTO_LOCK_SSL); 782 if (init_ciphers) load_ciphers(); 783 CRYPTO_w_unlock(CRYPTO_LOCK_SSL); 784 } 785 786 /* 787 * To reduce the work to do we only want to process the compiled 788 * in algorithms, so we first get the mask of disabled ciphers. 789 */ 790 disabled_mask = ssl_cipher_get_disabled(); 791 792 /* 793 * Now we have to collect the available ciphers from the compiled 794 * in ciphers. We cannot get more than the number compiled in, so 795 * it is used for allocation. 796 */ 797 num_of_ciphers = ssl_method->num_ciphers(); 798 #ifdef KSSL_DEBUG 799 printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers); 800 #endif /* KSSL_DEBUG */ 801 co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers); 802 if (co_list == NULL) 803 { 804 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE); 805 return(NULL); /* Failure */ 806 } 807 808 ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, disabled_mask, 809 co_list, &head, &tail); 810 811 /* 812 * We also need cipher aliases for selecting based on the rule_str. 813 * There might be two types of entries in the rule_str: 1) names 814 * of ciphers themselves 2) aliases for groups of ciphers. 815 * For 1) we need the available ciphers and for 2) the cipher 816 * groups of cipher_aliases added together in one list (otherwise 817 * we would be happy with just the cipher_aliases table). 818 */ 819 num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER); 820 num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1; 821 ca_list = 822 (SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max); 823 if (ca_list == NULL) 824 { 825 OPENSSL_free(co_list); 826 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE); 827 return(NULL); /* Failure */ 828 } 829 ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mask, 830 head); 831 832 /* 833 * If the rule_string begins with DEFAULT, apply the default rule 834 * before using the (possibly available) additional rules. 835 */ 836 ok = 1; 837 rule_p = rule_str; 838 if (strncmp(rule_str,"DEFAULT",7) == 0) 839 { 840 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST, 841 co_list, &head, &tail, ca_list); 842 rule_p += 7; 843 if (*rule_p == ':') 844 rule_p++; 845 } 846 847 if (ok && (strlen(rule_p) > 0)) 848 ok = ssl_cipher_process_rulestr(rule_p, co_list, &head, &tail, 849 ca_list); 850 851 OPENSSL_free(ca_list); /* Not needed anymore */ 852 853 if (!ok) 854 { /* Rule processing failure */ 855 OPENSSL_free(co_list); 856 return(NULL); 857 } 858 /* 859 * Allocate new "cipherstack" for the result, return with error 860 * if we cannot get one. 861 */ 862 if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) 863 { 864 OPENSSL_free(co_list); 865 return(NULL); 866 } 867 868 /* 869 * The cipher selection for the list is done. The ciphers are added 870 * to the resulting precedence to the STACK_OF(SSL_CIPHER). 871 */ 872 for (curr = head; curr != NULL; curr = curr->next) 873 { 874 #ifdef OPENSSL_FIPS 875 if (curr->active && (!FIPS_mode() || curr->cipher->algo_strength & SSL_FIPS)) 876 #else 877 if (curr->active) 878 #endif 879 { 880 sk_SSL_CIPHER_push(cipherstack, curr->cipher); 881 #ifdef CIPHER_DEBUG 882 printf("<%s>\n",curr->cipher->name); 883 #endif 884 } 885 } 886 OPENSSL_free(co_list); /* Not needed any longer */ 887 888 tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack); 889 if (tmp_cipher_list == NULL) 890 { 891 sk_SSL_CIPHER_free(cipherstack); 892 return NULL; 893 } 894 if (*cipher_list != NULL) 895 sk_SSL_CIPHER_free(*cipher_list); 896 *cipher_list = cipherstack; 897 if (*cipher_list_by_id != NULL) 898 sk_SSL_CIPHER_free(*cipher_list_by_id); 899 *cipher_list_by_id = tmp_cipher_list; 900 sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp); 901 902 return(cipherstack); 903 } 904 905 char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len) 906 { 907 int is_export,pkl,kl; 908 char *ver,*exp_str; 909 char *kx,*au,*enc,*mac; 910 unsigned long alg,alg2,alg_s; 911 #ifdef KSSL_DEBUG 912 static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx\n"; 913 #else 914 static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n"; 915 #endif /* KSSL_DEBUG */ 916 917 alg=cipher->algorithms; 918 alg_s=cipher->algo_strength; 919 alg2=cipher->algorithm2; 920 921 is_export=SSL_C_IS_EXPORT(cipher); 922 pkl=SSL_C_EXPORT_PKEYLENGTH(cipher); 923 kl=SSL_C_EXPORT_KEYLENGTH(cipher); 924 exp_str=is_export?" export":""; 925 926 if (alg & SSL_SSLV2) 927 ver="SSLv2"; 928 else if (alg & SSL_SSLV3) 929 ver="SSLv3"; 930 else 931 ver="unknown"; 932 933 switch (alg&SSL_MKEY_MASK) 934 { 935 case SSL_kRSA: 936 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA"; 937 break; 938 case SSL_kDHr: 939 kx="DH/RSA"; 940 break; 941 case SSL_kDHd: 942 kx="DH/DSS"; 943 break; 944 case SSL_kKRB5: /* VRS */ 945 case SSL_KRB5: /* VRS */ 946 kx="KRB5"; 947 break; 948 case SSL_kFZA: 949 kx="Fortezza"; 950 break; 951 case SSL_kEDH: 952 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH"; 953 break; 954 default: 955 kx="unknown"; 956 } 957 958 switch (alg&SSL_AUTH_MASK) 959 { 960 case SSL_aRSA: 961 au="RSA"; 962 break; 963 case SSL_aDSS: 964 au="DSS"; 965 break; 966 case SSL_aDH: 967 au="DH"; 968 break; 969 case SSL_aKRB5: /* VRS */ 970 case SSL_KRB5: /* VRS */ 971 au="KRB5"; 972 break; 973 case SSL_aFZA: 974 case SSL_aNULL: 975 au="None"; 976 break; 977 default: 978 au="unknown"; 979 break; 980 } 981 982 switch (alg&SSL_ENC_MASK) 983 { 984 case SSL_DES: 985 enc=(is_export && kl == 5)?"DES(40)":"DES(56)"; 986 break; 987 case SSL_3DES: 988 enc="3DES(168)"; 989 break; 990 case SSL_RC4: 991 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)") 992 :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)"); 993 break; 994 case SSL_RC2: 995 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)"; 996 break; 997 case SSL_IDEA: 998 enc="IDEA(128)"; 999 break; 1000 case SSL_eFZA: 1001 enc="Fortezza"; 1002 break; 1003 case SSL_eNULL: 1004 enc="None"; 1005 break; 1006 case SSL_AES: 1007 switch(cipher->strength_bits) 1008 { 1009 case 128: enc="AES(128)"; break; 1010 case 192: enc="AES(192)"; break; 1011 case 256: enc="AES(256)"; break; 1012 default: enc="AES(?""?""?)"; break; 1013 } 1014 break; 1015 default: 1016 enc="unknown"; 1017 break; 1018 } 1019 1020 switch (alg&SSL_MAC_MASK) 1021 { 1022 case SSL_MD5: 1023 mac="MD5"; 1024 break; 1025 case SSL_SHA1: 1026 mac="SHA1"; 1027 break; 1028 default: 1029 mac="unknown"; 1030 break; 1031 } 1032 1033 if (buf == NULL) 1034 { 1035 len=128; 1036 buf=OPENSSL_malloc(len); 1037 if (buf == NULL) return("OPENSSL_malloc Error"); 1038 } 1039 else if (len < 128) 1040 return("Buffer too small"); 1041 1042 #ifdef KSSL_DEBUG 1043 BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg); 1044 #else 1045 BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str); 1046 #endif /* KSSL_DEBUG */ 1047 return(buf); 1048 } 1049 1050 char *SSL_CIPHER_get_version(const SSL_CIPHER *c) 1051 { 1052 int i; 1053 1054 if (c == NULL) return("(NONE)"); 1055 i=(int)(c->id>>24L); 1056 if (i == 3) 1057 return("TLSv1/SSLv3"); 1058 else if (i == 2) 1059 return("SSLv2"); 1060 else 1061 return("unknown"); 1062 } 1063 1064 /* return the actual cipher being used */ 1065 const char *SSL_CIPHER_get_name(const SSL_CIPHER *c) 1066 { 1067 if (c != NULL) 1068 return(c->name); 1069 return("(NONE)"); 1070 } 1071 1072 /* number of bits for symmetric cipher */ 1073 int SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits) 1074 { 1075 int ret=0; 1076 1077 if (c != NULL) 1078 { 1079 if (alg_bits != NULL) *alg_bits = c->alg_bits; 1080 ret = c->strength_bits; 1081 } 1082 return(ret); 1083 } 1084 1085 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n) 1086 { 1087 SSL_COMP *ctmp; 1088 int i,nn; 1089 1090 if ((n == 0) || (sk == NULL)) return(NULL); 1091 nn=sk_SSL_COMP_num(sk); 1092 for (i=0; i<nn; i++) 1093 { 1094 ctmp=sk_SSL_COMP_value(sk,i); 1095 if (ctmp->id == n) 1096 return(ctmp); 1097 } 1098 return(NULL); 1099 } 1100 1101 static int sk_comp_cmp(const SSL_COMP * const *a, 1102 const SSL_COMP * const *b) 1103 { 1104 return((*a)->id-(*b)->id); 1105 } 1106 1107 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void) 1108 { 1109 return(ssl_comp_methods); 1110 } 1111 1112 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm) 1113 { 1114 SSL_COMP *comp; 1115 STACK_OF(SSL_COMP) *sk; 1116 1117 if (cm == NULL || cm->type == NID_undef) 1118 return 1; 1119 1120 MemCheck_off(); 1121 comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP)); 1122 comp->id=id; 1123 comp->method=cm; 1124 if (ssl_comp_methods == NULL) 1125 sk=ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp); 1126 else 1127 sk=ssl_comp_methods; 1128 if ((sk == NULL) || !sk_SSL_COMP_push(sk,comp)) 1129 { 1130 MemCheck_on(); 1131 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE); 1132 return(1); 1133 } 1134 else 1135 { 1136 MemCheck_on(); 1137 return(0); 1138 } 1139 } 1140