ssl/ssl_ciph.c

   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  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  60  * ECC cipher suite support in OpenSSL originally developed by
  61  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
  62  */
  63 #include <stdio.h>
  64 #include <openssl/objects.h>
  65 #include <openssl/comp.h>
  66 #include "ssl_locl.h"
  67
  68 #define SSL_ENC_DES_IDX         0
  69 #define SSL_ENC_3DES_IDX        1
  70 #define SSL_ENC_RC4_IDX         2
  71 #define SSL_ENC_RC2_IDX         3
  72 #define SSL_ENC_IDEA_IDX        4
  73 #define SSL_ENC_eFZA_IDX        5
  74 #define SSL_ENC_NULL_IDX        6
  75 #define SSL_ENC_AES128_IDX      7
  76 #define SSL_ENC_AES256_IDX      8
  77 #define SSL_ENC_NUM_IDX         9
  78
  79 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
  80         NULL,NULL,NULL,NULL,NULL,NULL,
  81         };
  82
  83 #define SSL_COMP_NULL_IDX       0
  84 #define SSL_COMP_ZLIB_IDX       1
  85 #define SSL_COMP_NUM_IDX        2
  86
  87 static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
  88
  89 #define SSL_MD_MD5_IDX  0
  90 #define SSL_MD_SHA1_IDX 1
  91 #define SSL_MD_NUM_IDX  2
  92 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
  93         NULL,NULL,
  94         };
  95
  96 #define CIPHER_ADD      1
  97 #define CIPHER_KILL     2
  98 #define CIPHER_DEL      3
  99 #define CIPHER_ORD      4
 100 #define CIPHER_SPECIAL  5
 101
 102 typedef struct cipher_order_st
 103         {
 104         SSL_CIPHER *cipher;
 105         int active;
 106         int dead;
 107         struct cipher_order_st *next,*prev;
 108         } CIPHER_ORDER;
 109
 110 static const SSL_CIPHER cipher_aliases[]={
 111         /* Don't include eNULL unless specifically enabled. */
 112         /* Don't include ECC in ALL because these ciphers are not yet official. */
 113         {0,SSL_TXT_ALL, 0,SSL_ALL & ~SSL_eNULL & ~SSL_kECDH & ~SSL_kECDHE, SSL_ALL ,0,0,0,SSL_ALL,SSL_ALL}, /* must be first */
 114         /* TODO: COMPLEMENT OF ALL and COMPLEMENT OF DEFAULT do not have ECC cipher suites handled properly. */
 115         {0,SSL_TXT_CMPALL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0},  /* COMPLEMENT OF ALL */
 116         {0,SSL_TXT_CMPDEF,0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK,0},
 117         {0,SSL_TXT_kKRB5,0,SSL_kKRB5,0,0,0,0,SSL_MKEY_MASK,0},  /* VRS Kerberos5 */
 118         {0,SSL_TXT_kRSA,0,SSL_kRSA,  0,0,0,0,SSL_MKEY_MASK,0},
 119         {0,SSL_TXT_kDHr,0,SSL_kDHr,  0,0,0,0,SSL_MKEY_MASK,0},
 120         {0,SSL_TXT_kDHd,0,SSL_kDHd,  0,0,0,0,SSL_MKEY_MASK,0},
 121         {0,SSL_TXT_kEDH,0,SSL_kEDH,  0,0,0,0,SSL_MKEY_MASK,0},
 122         {0,SSL_TXT_kFZA,0,SSL_kFZA,  0,0,0,0,SSL_MKEY_MASK,0},
 123         {0,SSL_TXT_DH,  0,SSL_DH,    0,0,0,0,SSL_MKEY_MASK,0},
 124         {0,SSL_TXT_ECC, 0,(SSL_kECDH|SSL_kECDHE), 0,0,0,0,SSL_MKEY_MASK,0},
 125         {0,SSL_TXT_EDH, 0,SSL_EDH,   0,0,0,0,SSL_MKEY_MASK|SSL_AUTH_MASK,0},
 126         {0,SSL_TXT_aKRB5,0,SSL_aKRB5,0,0,0,0,SSL_AUTH_MASK,0},  /* VRS Kerberos5 */
 127         {0,SSL_TXT_aRSA,0,SSL_aRSA,  0,0,0,0,SSL_AUTH_MASK,0},
 128         {0,SSL_TXT_aDSS,0,SSL_aDSS,  0,0,0,0,SSL_AUTH_MASK,0},
 129         {0,SSL_TXT_aFZA,0,SSL_aFZA,  0,0,0,0,SSL_AUTH_MASK,0},
 130         {0,SSL_TXT_aNULL,0,SSL_aNULL,0,0,0,0,SSL_AUTH_MASK,0},
 131         {0,SSL_TXT_aDH, 0,SSL_aDH,   0,0,0,0,SSL_AUTH_MASK,0},
 132         {0,SSL_TXT_DSS, 0,SSL_DSS,   0,0,0,0,SSL_AUTH_MASK,0},
 133
 134         {0,SSL_TXT_DES, 0,SSL_DES,   0,0,0,0,SSL_ENC_MASK,0},
 135         {0,SSL_TXT_3DES,0,SSL_3DES,  0,0,0,0,SSL_ENC_MASK,0},
 136         {0,SSL_TXT_RC4, 0,SSL_RC4,   0,0,0,0,SSL_ENC_MASK,0},
 137         {0,SSL_TXT_RC2, 0,SSL_RC2,   0,0,0,0,SSL_ENC_MASK,0},
 138 #ifndef OPENSSL_NO_IDEA
 139         {0,SSL_TXT_IDEA,0,SSL_IDEA,  0,0,0,0,SSL_ENC_MASK,0},
 140 #endif
 141         {0,SSL_TXT_eNULL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0},
 142         {0,SSL_TXT_eFZA,0,SSL_eFZA,  0,0,0,0,SSL_ENC_MASK,0},
 143         {0,SSL_TXT_AES, 0,SSL_AES,   0,0,0,0,SSL_ENC_MASK,0},
 144
 145         {0,SSL_TXT_MD5, 0,SSL_MD5,   0,0,0,0,SSL_MAC_MASK,0},
 146         {0,SSL_TXT_SHA1,0,SSL_SHA1,  0,0,0,0,SSL_MAC_MASK,0},
 147         {0,SSL_TXT_SHA, 0,SSL_SHA,   0,0,0,0,SSL_MAC_MASK,0},
 148
 149         {0,SSL_TXT_NULL,0,SSL_NULL,  0,0,0,0,SSL_ENC_MASK,0},
 150         {0,SSL_TXT_KRB5,0,SSL_KRB5,  0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
 151         {0,SSL_TXT_RSA, 0,SSL_RSA,   0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
 152         {0,SSL_TXT_ADH, 0,SSL_ADH,   0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
 153         {0,SSL_TXT_FZA, 0,SSL_FZA,   0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK,0},
 154
 155         {0,SSL_TXT_SSLV2, 0,SSL_SSLV2, 0,0,0,0,SSL_SSL_MASK,0},
 156         {0,SSL_TXT_SSLV3, 0,SSL_SSLV3, 0,0,0,0,SSL_SSL_MASK,0},
 157         {0,SSL_TXT_TLSV1, 0,SSL_TLSV1, 0,0,0,0,SSL_SSL_MASK,0},
 158
 159         {0,SSL_TXT_EXP   ,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK},
 160         {0,SSL_TXT_EXPORT,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK},
 161         {0,SSL_TXT_EXP40, 0, 0, SSL_EXP40, 0,0,0,0,SSL_STRONG_MASK},
 162         {0,SSL_TXT_EXP56, 0, 0, SSL_EXP56, 0,0,0,0,SSL_STRONG_MASK},
 163         {0,SSL_TXT_LOW,   0, 0,   SSL_LOW, 0,0,0,0,SSL_STRONG_MASK},
 164         {0,SSL_TXT_MEDIUM,0, 0,SSL_MEDIUM, 0,0,0,0,SSL_STRONG_MASK},
 165         {0,SSL_TXT_HIGH,  0, 0,  SSL_HIGH, 0,0,0,0,SSL_STRONG_MASK},
 166         };
 167
 168 void ssl_load_ciphers(void)
 169         {
 170         ssl_cipher_methods[SSL_ENC_DES_IDX]=
 171                 EVP_get_cipherbyname(SN_des_cbc);
 172         ssl_cipher_methods[SSL_ENC_3DES_IDX]=
 173                 EVP_get_cipherbyname(SN_des_ede3_cbc);
 174         ssl_cipher_methods[SSL_ENC_RC4_IDX]=
 175                 EVP_get_cipherbyname(SN_rc4);
 176         ssl_cipher_methods[SSL_ENC_RC2_IDX]=
 177                 EVP_get_cipherbyname(SN_rc2_cbc);
 178 #ifndef OPENSSL_NO_IDEA
 179         ssl_cipher_methods[SSL_ENC_IDEA_IDX]=
 180                 EVP_get_cipherbyname(SN_idea_cbc);
 181 #else
 182         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= NULL;
 183 #endif
 184         ssl_cipher_methods[SSL_ENC_AES128_IDX]=
 185           EVP_get_cipherbyname(SN_aes_128_cbc);
 186         ssl_cipher_methods[SSL_ENC_AES256_IDX]=
 187           EVP_get_cipherbyname(SN_aes_256_cbc);
 188
 189         ssl_digest_methods[SSL_MD_MD5_IDX]=
 190                 EVP_get_digestbyname(SN_md5);
 191         ssl_digest_methods[SSL_MD_SHA1_IDX]=
 192                 EVP_get_digestbyname(SN_sha1);
 193         }
 194
 195
 196 #ifndef OPENSSL_NO_COMP
 197
 198 static int sk_comp_cmp(const SSL_COMP * const *a,
 199                         const SSL_COMP * const *b)
 200         {
 201         return((*a)->id-(*b)->id);
 202         }
 203
 204 static void load_builtin_compressions(void)
 205         {
 206         if (ssl_comp_methods != NULL)
 207                 return;
 208
 209         CRYPTO_w_lock(CRYPTO_LOCK_SSL);
 210         if (ssl_comp_methods == NULL)
 211                 {
 212                 SSL_COMP *comp = NULL;
 213
 214                 MemCheck_off();
 215                 ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
 216                 if (ssl_comp_methods != NULL)
 217                         {
 218                         comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
 219                         if (comp != NULL)
 220                                 {
 221                                 comp->method=COMP_zlib();
 222                                 if (comp->method
 223                                         && comp->method->type == NID_undef)
 224                                         OPENSSL_free(comp);
 225                                 else
 226                                         {
 227                                         comp->id=SSL_COMP_ZLIB_IDX;
 228                                         comp->name=comp->method->name;
 229                                         sk_SSL_COMP_push(ssl_comp_methods,comp);
 230                                         }
 231                                 }
 232                         }
 233                 MemCheck_on();
 234                 }
 235         CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
 236         }
 237 #endif
 238
 239 int ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc,
 240              const EVP_MD **md, SSL_COMP **comp)
 241         {
 242         int i;
 243         SSL_CIPHER *c;
 244
 245         c=s->cipher;
 246         if (c == NULL) return(0);
 247         if (comp != NULL)
 248                 {
 249                 SSL_COMP ctmp;
 250 #ifndef OPENSSL_NO_COMP
 251                 load_builtin_compressions();
 252 #endif
 253
 254                 *comp=NULL;
 255                 ctmp.id=s->compress_meth;
 256                 if (ssl_comp_methods != NULL)
 257                         {
 258                         i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
 259                         if (i >= 0)
 260                                 *comp=sk_SSL_COMP_value(ssl_comp_methods,i);
 261                         else
 262                                 *comp=NULL;
 263                         }
 264                 }
 265
 266         if ((enc == NULL) || (md == NULL)) return(0);
 267
 268         switch (c->algorithms & SSL_ENC_MASK)
 269                 {
 270         case SSL_DES:
 271                 i=SSL_ENC_DES_IDX;
 272                 break;
 273         case SSL_3DES:
 274                 i=SSL_ENC_3DES_IDX;
 275                 break;
 276         case SSL_RC4:
 277                 i=SSL_ENC_RC4_IDX;
 278                 break;
 279         case SSL_RC2:
 280                 i=SSL_ENC_RC2_IDX;
 281                 break;
 282         case SSL_IDEA:
 283                 i=SSL_ENC_IDEA_IDX;
 284                 break;
 285         case SSL_eNULL:
 286                 i=SSL_ENC_NULL_IDX;
 287                 break;
 288         case SSL_AES:
 289                 switch(c->alg_bits)
 290                         {
 291                 case 128: i=SSL_ENC_AES128_IDX; break;
 292                 case 256: i=SSL_ENC_AES256_IDX; break;
 293                 default: i=-1; break;
 294                         }
 295                 break;
 296         default:
 297                 i= -1;
 298                 break;
 299                 }
 300
 301         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
 302                 *enc=NULL;
 303         else
 304                 {
 305                 if (i == SSL_ENC_NULL_IDX)
 306                         *enc=EVP_enc_null();
 307                 else
 308                         *enc=ssl_cipher_methods[i];
 309                 }
 310
 311         switch (c->algorithms & SSL_MAC_MASK)
 312                 {
 313         case SSL_MD5:
 314                 i=SSL_MD_MD5_IDX;
 315                 break;
 316         case SSL_SHA1:
 317                 i=SSL_MD_SHA1_IDX;
 318                 break;
 319         default:
 320                 i= -1;
 321                 break;
 322                 }
 323         if ((i < 0) || (i > SSL_MD_NUM_IDX))
 324                 *md=NULL;
 325         else
 326                 *md=ssl_digest_methods[i];
 327
 328         if ((*enc != NULL) && (*md != NULL))
 329                 return(1);
 330         else
 331                 return(0);
 332         }
 333
 334 #define ITEM_SEP(a) \
 335         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
 336
 337 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
 338              CIPHER_ORDER **tail)
 339         {
 340         if (curr == *tail) return;
 341         if (curr == *head)
 342                 *head=curr->next;
 343         if (curr->prev != NULL)
 344                 curr->prev->next=curr->next;
 345         if (curr->next != NULL) /* should always be true */
 346                 curr->next->prev=curr->prev;
 347         (*tail)->next=curr;
 348         curr->prev= *tail;
 349         curr->next=NULL;
 350         *tail=curr;
 351         }
 352
 353 static unsigned long ssl_cipher_get_disabled(void)
 354         {
 355         unsigned long mask;
 356
 357         mask = SSL_kFZA;
 358 #ifdef OPENSSL_NO_RSA
 359         mask |= SSL_aRSA|SSL_kRSA;
 360 #endif
 361 #ifdef OPENSSL_NO_DSA
 362         mask |= SSL_aDSS;
 363 #endif
 364 #ifdef OPENSSL_NO_DH
 365         mask |= SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
 366 #endif
 367 #ifdef OPENSSL_NO_KRB5
 368         mask |= SSL_kKRB5|SSL_aKRB5;
 369 #endif
 370 #ifdef OPENSSL_NO_ECDH
 371         mask |= SSL_kECDH|SSL_kECDHE;
 372 #endif
 373 #ifdef SSL_FORBID_ENULL
 374         mask |= SSL_eNULL;
 375 #endif
 376
 377         mask |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
 378         mask |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
 379         mask |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
 380         mask |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
 381         mask |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
 382         mask |= (ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL) ? SSL_eFZA:0;
 383         mask |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES:0;
 384
 385         mask |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
 386         mask |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
 387
 388         return(mask);
 389         }
 390
 391 static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
 392                 int num_of_ciphers, unsigned long mask, CIPHER_ORDER *co_list,
 393                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
 394         {
 395         int i, co_list_num;
 396         SSL_CIPHER *c;
 397
 398         /*
 399          * We have num_of_ciphers descriptions compiled in, depending on the
 400          * method selected (SSLv2 and/or SSLv3, TLSv1 etc).
 401          * These will later be sorted in a linked list with at most num
 402          * entries.
 403          */
 404
 405         /* Get the initial list of ciphers */
 406         co_list_num = 0;        /* actual count of ciphers */
 407         for (i = 0; i < num_of_ciphers; i++)
 408                 {
 409                 c = ssl_method->get_cipher(i);
 410                 /* drop those that use any of that is not available */
 411                 if ((c != NULL) && c->valid && !(c->algorithms & mask))
 412                         {
 413                         co_list[co_list_num].cipher = c;
 414                         co_list[co_list_num].next = NULL;
 415                         co_list[co_list_num].prev = NULL;
 416                         co_list[co_list_num].active = 0;
 417                         co_list_num++;
 418 #ifdef KSSL_DEBUG
 419                         printf("\t%d: %s %lx %lx\n",i,c->name,c->id,c->algorithms);
 420 #endif  /* KSSL_DEBUG */
 421                         /*
 422                         if (!sk_push(ca_list,(char *)c)) goto err;
 423                         */
 424                         }
 425                 }
 426
 427         /*
 428          * Prepare linked list from list entries
 429          */
 430         for (i = 1; i < co_list_num - 1; i++)
 431                 {
 432                 co_list[i].prev = &(co_list[i-1]);
 433                 co_list[i].next = &(co_list[i+1]);
 434                 }
 435         if (co_list_num > 0)
 436                 {
 437                 (*head_p) = &(co_list[0]);
 438                 (*head_p)->prev = NULL;
 439                 (*head_p)->next = &(co_list[1]);
 440                 (*tail_p) = &(co_list[co_list_num - 1]);
 441                 (*tail_p)->prev = &(co_list[co_list_num - 2]);
 442                 (*tail_p)->next = NULL;
 443                 }
 444         }
 445
 446 static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list,
 447                         int num_of_group_aliases, unsigned long mask,
 448                         CIPHER_ORDER *head)
 449         {
 450         CIPHER_ORDER *ciph_curr;
 451         SSL_CIPHER **ca_curr;
 452         int i;
 453
 454         /*
 455          * First, add the real ciphers as already collected
 456          */
 457         ciph_curr = head;
 458         ca_curr = ca_list;
 459         while (ciph_curr != NULL)
 460                 {
 461                 *ca_curr = ciph_curr->cipher;
 462                 ca_curr++;
 463                 ciph_curr = ciph_curr->next;
 464                 }
 465
 466         /*
 467          * Now we add the available ones from the cipher_aliases[] table.
 468          * They represent either an algorithm, that must be fully
 469          * supported (not match any bit in mask) or represent a cipher
 470          * strength value (will be added in any case because algorithms=0).
 471          */
 472         for (i = 0; i < num_of_group_aliases; i++)
 473                 {
 474                 if ((i == 0) ||         /* always fetch "ALL" */
 475                     !(cipher_aliases[i].algorithms & mask))
 476                         {
 477                         *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
 478                         ca_curr++;
 479                         }
 480                 }
 481
 482         *ca_curr = NULL;        /* end of list */
 483         }
 484
 485 static void ssl_cipher_apply_rule(unsigned long algorithms, unsigned long mask,
 486                 unsigned long algo_strength, unsigned long mask_strength,
 487                 int rule, int strength_bits, CIPHER_ORDER *co_list,
 488                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
 489         {
 490         CIPHER_ORDER *head, *tail, *curr, *curr2, *tail2;
 491         SSL_CIPHER *cp;
 492         unsigned long ma, ma_s;
 493
 494 #ifdef CIPHER_DEBUG
 495         printf("Applying rule %d with %08lx %08lx %08lx %08lx (%d)\n",
 496                 rule, algorithms, mask, algo_strength, mask_strength,
 497                 strength_bits);
 498 #endif
 499
 500         curr = head = *head_p;
 501         curr2 = head;
 502         tail2 = tail = *tail_p;
 503         for (;;)
 504                 {
 505                 if ((curr == NULL) || (curr == tail2)) break;
 506                 curr = curr2;
 507                 curr2 = curr->next;
 508
 509                 cp = curr->cipher;
 510
 511                 /*
 512                  * Selection criteria is either the number of strength_bits
 513                  * or the algorithm used.
 514                  */
 515                 if (strength_bits == -1)
 516                         {
 517                         ma = mask & cp->algorithms;
 518                         ma_s = mask_strength & cp->algo_strength;
 519
 520 #ifdef CIPHER_DEBUG
 521                         printf("\nName: %s:\nAlgo = %08lx Algo_strength = %08lx\nMask = %08lx Mask_strength %08lx\n", cp->name, cp->algorithms, cp->algo_strength, mask, mask_strength);
 522                         printf("ma = %08lx ma_s %08lx, ma&algo=%08lx, ma_s&algos=%08lx\n", ma, ma_s, ma&algorithms, ma_s&algo_strength);
 523 #endif
 524                         /*
 525                          * Select: if none of the mask bit was met from the
 526                          * cipher or not all of the bits were met, the
 527                          * selection does not apply.
 528                          */
 529                         if (((ma == 0) && (ma_s == 0)) ||
 530                             ((ma & algorithms) != ma) ||
 531                             ((ma_s & algo_strength) != ma_s))
 532                                 continue; /* does not apply */
 533                         }
 534                 else if (strength_bits != cp->strength_bits)
 535                         continue;       /* does not apply */
 536
 537 #ifdef CIPHER_DEBUG
 538                 printf("Action = %d\n", rule);
 539 #endif
 540
 541                 /* add the cipher if it has not been added yet. */
 542                 if (rule == CIPHER_ADD)
 543                         {
 544                         if (!curr->active)
 545                                 {
 546                                 ll_append_tail(&head, curr, &tail);
 547                                 curr->active = 1;
 548                                 }
 549                         }
 550                 /* Move the added cipher to this location */
 551                 else if (rule == CIPHER_ORD)
 552                         {
 553                         if (curr->active)
 554                                 {
 555                                 ll_append_tail(&head, curr, &tail);
 556                                 }
 557                         }
 558                 else if (rule == CIPHER_DEL)
 559                         curr->active = 0;
 560                 else if (rule == CIPHER_KILL)
 561                         {
 562                         if (head == curr)
 563                                 head = curr->next;
 564                         else
 565                                 curr->prev->next = curr->next;
 566                         if (tail == curr)
 567                                 tail = curr->prev;
 568                         curr->active = 0;
 569                         if (curr->next != NULL)
 570                                 curr->next->prev = curr->prev;
 571                         if (curr->prev != NULL)
 572                                 curr->prev->next = curr->next;
 573                         curr->next = NULL;
 574                         curr->prev = NULL;
 575                         }
 576                 }
 577
 578         *head_p = head;
 579         *tail_p = tail;
 580         }
 581
 582 static int ssl_cipher_strength_sort(CIPHER_ORDER *co_list,
 583                                     CIPHER_ORDER **head_p,
 584                                     CIPHER_ORDER **tail_p)
 585         {
 586         int max_strength_bits, i, *number_uses;
 587         CIPHER_ORDER *curr;
 588
 589         /*
 590          * This routine sorts the ciphers with descending strength. The sorting
 591          * must keep the pre-sorted sequence, so we apply the normal sorting
 592          * routine as '+' movement to the end of the list.
 593          */
 594         max_strength_bits = 0;
 595         curr = *head_p;
 596         while (curr != NULL)
 597                 {
 598                 if (curr->active &&
 599                     (curr->cipher->strength_bits > max_strength_bits))
 600                     max_strength_bits = curr->cipher->strength_bits;
 601                 curr = curr->next;
 602                 }
 603
 604         number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
 605         if (!number_uses)
 606         {
 607                 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
 608                 return(0);
 609         }
 610         memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
 611
 612         /*
 613          * Now find the strength_bits values actually used
 614          */
 615         curr = *head_p;
 616         while (curr != NULL)
 617                 {
 618                 if (curr->active)
 619                         number_uses[curr->cipher->strength_bits]++;
 620                 curr = curr->next;
 621                 }
 622         /*
 623          * Go through the list of used strength_bits values in descending
 624          * order.
 625          */
 626         for (i = max_strength_bits; i >= 0; i--)
 627                 if (number_uses[i] > 0)
 628                         ssl_cipher_apply_rule(0, 0, 0, 0, CIPHER_ORD, i,
 629                                         co_list, head_p, tail_p);
 630
 631         OPENSSL_free(number_uses);
 632         return(1);
 633         }
 634
 635 static int ssl_cipher_process_rulestr(const char *rule_str,
 636                 CIPHER_ORDER *co_list, CIPHER_ORDER **head_p,
 637                 CIPHER_ORDER **tail_p, SSL_CIPHER **ca_list)
 638         {
 639         unsigned long algorithms, mask, algo_strength, mask_strength;
 640         const char *l, *start, *buf;
 641         int j, multi, found, rule, retval, ok, buflen;
 642         char ch;
 643
 644         retval = 1;
 645         l = rule_str;
 646         for (;;)
 647                 {
 648                 ch = *l;
 649
 650                 if (ch == '\0')
 651                         break;          /* done */
 652                 if (ch == '-')
 653                         { rule = CIPHER_DEL; l++; }
 654                 else if (ch == '+')
 655                         { rule = CIPHER_ORD; l++; }
 656                 else if (ch == '!')
 657                         { rule = CIPHER_KILL; l++; }
 658                 else if (ch == '@')
 659                         { rule = CIPHER_SPECIAL; l++; }
 660                 else
 661                         { rule = CIPHER_ADD; }
 662
 663                 if (ITEM_SEP(ch))
 664                         {
 665                         l++;
 666                         continue;
 667                         }
 668
 669                 algorithms = mask = algo_strength = mask_strength = 0;
 670
 671                 start=l;
 672                 for (;;)
 673                         {
 674                         ch = *l;
 675                         buf = l;
 676                         buflen = 0;
 677 #ifndef CHARSET_EBCDIC
 678                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
 679                                 ((ch >= '0') && (ch <= '9')) ||
 680                                 ((ch >= 'a') && (ch <= 'z')) ||
 681                                  (ch == '-'))
 682 #else
 683                         while ( isalnum(ch) || (ch == '-'))
 684 #endif
 685                                  {
 686                                  ch = *(++l);
 687                                  buflen++;
 688                                  }
 689
 690                         if (buflen == 0)
 691                                 {
 692                                 /*
 693                                  * We hit something we cannot deal with,
 694                                  * it is no command or separator nor
 695                                  * alphanumeric, so we call this an error.
 696                                  */
 697                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
 698                                        SSL_R_INVALID_COMMAND);
 699                                 retval = found = 0;
 700                                 l++;
 701                                 break;
 702                                 }
 703
 704                         if (rule == CIPHER_SPECIAL)
 705                                 {
 706                                 found = 0; /* unused -- avoid compiler warning */
 707                                 break;  /* special treatment */
 708                                 }
 709
 710                         /* check for multi-part specification */
 711                         if (ch == '+')
 712                                 {
 713                                 multi=1;
 714                                 l++;
 715                                 }
 716                         else
 717                                 multi=0;
 718
 719                         /*
 720                          * Now search for the cipher alias in the ca_list. Be careful
 721                          * with the strncmp, because the "buflen" limitation
 722                          * will make the rule "ADH:SOME" and the cipher
 723                          * "ADH-MY-CIPHER" look like a match for buflen=3.
 724                          * So additionally check whether the cipher name found
 725                          * has the correct length. We can save a strlen() call:
 726                          * just checking for the '\0' at the right place is
 727                          * sufficient, we have to strncmp() anyway. (We cannot
 728                          * use strcmp(), because buf is not '\0' terminated.)
 729                          */
 730                          j = found = 0;
 731                          while (ca_list[j])
 732                                 {
 733                                 if (!strncmp(buf, ca_list[j]->name, buflen) &&
 734                                     (ca_list[j]->name[buflen] == '\0'))
 735                                         {
 736                                         found = 1;
 737                                         break;
 738                                         }
 739                                 else
 740                                         j++;
 741                                 }
 742                         if (!found)
 743                                 break;  /* ignore this entry */
 744
 745                         /* New algorithms:
 746                          *  1 - any old restrictions apply outside new mask
 747                          *  2 - any new restrictions apply outside old mask
 748                          *  3 - enforce old & new where masks intersect
 749                          */
 750                         algorithms = (algorithms & ~ca_list[j]->mask) |         /* 1 */
 751                                      (ca_list[j]->algorithms & ~mask) |         /* 2 */
 752                                      (algorithms & ca_list[j]->algorithms);     /* 3 */
 753                         mask |= ca_list[j]->mask;
 754                         algo_strength = (algo_strength & ~ca_list[j]->mask_strength) |
 755                                         (ca_list[j]->algo_strength & ~mask_strength) |
 756                                         (algo_strength & ca_list[j]->algo_strength);
 757                         mask_strength |= ca_list[j]->mask_strength;
 758
 759                         if (!multi) break;
 760                         }
 761
 762                 /*
 763                  * Ok, we have the rule, now apply it
 764                  */
 765                 if (rule == CIPHER_SPECIAL)
 766                         {       /* special command */
 767                         ok = 0;
 768                         if ((buflen == 8) &&
 769                                 !strncmp(buf, "STRENGTH", 8))
 770                                 ok = ssl_cipher_strength_sort(co_list,
 771                                         head_p, tail_p);
 772                         else
 773                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
 774                                         SSL_R_INVALID_COMMAND);
 775                         if (ok == 0)
 776                                 retval = 0;
 777                         /*
 778                          * We do not support any "multi" options
 779                          * together with "@", so throw away the
 780                          * rest of the command, if any left, until
 781                          * end or ':' is found.
 782                          */
 783                         while ((*l != '\0') && ITEM_SEP(*l))
 784                                 l++;
 785                         }
 786                 else if (found)
 787                         {
 788                         ssl_cipher_apply_rule(algorithms, mask,
 789                                 algo_strength, mask_strength, rule, -1,
 790                                 co_list, head_p, tail_p);
 791                         }
 792                 else
 793                         {
 794                         while ((*l != '\0') && ITEM_SEP(*l))
 795                                 l++;
 796                         }
 797                 if (*l == '\0') break; /* done */
 798                 }
 799
 800         return(retval);
 801         }
 802
 803 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
 804                 STACK_OF(SSL_CIPHER) **cipher_list,
 805                 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
 806                 const char *rule_str)
 807         {
 808         int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
 809         unsigned long disabled_mask;
 810         STACK_OF(SSL_CIPHER) *cipherstack, *tmp_cipher_list;
 811         const char *rule_p;
 812         CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
 813         SSL_CIPHER **ca_list = NULL;
 814
 815         /*
 816          * Return with error if nothing to do.
 817          */
 818         if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == NULL)
 819                 return NULL;
 820
 821         /*
 822          * To reduce the work to do we only want to process the compiled
 823          * in algorithms, so we first get the mask of disabled ciphers.
 824          */
 825         disabled_mask = ssl_cipher_get_disabled();
 826
 827         /*
 828          * Now we have to collect the available ciphers from the compiled
 829          * in ciphers. We cannot get more than the number compiled in, so
 830          * it is used for allocation.
 831          */
 832         num_of_ciphers = ssl_method->num_ciphers();
 833 #ifdef KSSL_DEBUG
 834         printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers);
 835 #endif    /* KSSL_DEBUG */
 836         co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
 837         if (co_list == NULL)
 838                 {
 839                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
 840                 return(NULL);   /* Failure */
 841                 }
 842
 843         ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, disabled_mask,
 844                                    co_list, &head, &tail);
 845
 846         /*
 847          * We also need cipher aliases for selecting based on the rule_str.
 848          * There might be two types of entries in the rule_str: 1) names
 849          * of ciphers themselves 2) aliases for groups of ciphers.
 850          * For 1) we need the available ciphers and for 2) the cipher
 851          * groups of cipher_aliases added together in one list (otherwise
 852          * we would be happy with just the cipher_aliases table).
 853          */
 854         num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
 855         num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
 856         ca_list =
 857                 (SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
 858         if (ca_list == NULL)
 859                 {
 860                 OPENSSL_free(co_list);
 861                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
 862                 return(NULL);   /* Failure */
 863                 }
 864         ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mask,
 865                                    head);
 866
 867         /*
 868          * If the rule_string begins with DEFAULT, apply the default rule
 869          * before using the (possibly available) additional rules.
 870          */
 871         ok = 1;
 872         rule_p = rule_str;
 873         if (strncmp(rule_str,"DEFAULT",7) == 0)
 874                 {
 875                 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
 876                         co_list, &head, &tail, ca_list);
 877                 rule_p += 7;
 878                 if (*rule_p == ':')
 879                         rule_p++;
 880                 }
 881
 882         if (ok && (strlen(rule_p) > 0))
 883                 ok = ssl_cipher_process_rulestr(rule_p, co_list, &head, &tail,
 884                                                 ca_list);
 885
 886         OPENSSL_free(ca_list);  /* Not needed anymore */
 887
 888         if (!ok)
 889                 {       /* Rule processing failure */
 890                 OPENSSL_free(co_list);
 891                 return(NULL);
 892                 }
 893         /*
 894          * Allocate new "cipherstack" for the result, return with error
 895          * if we cannot get one.
 896          */
 897         if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
 898                 {
 899                 OPENSSL_free(co_list);
 900                 return(NULL);
 901                 }
 902
 903         /*
 904          * The cipher selection for the list is done. The ciphers are added
 905          * to the resulting precedence to the STACK_OF(SSL_CIPHER).
 906          */
 907         for (curr = head; curr != NULL; curr = curr->next)
 908                 {
 909                 if (curr->active)
 910                         {
 911                         sk_SSL_CIPHER_push(cipherstack, curr->cipher);
 912 #ifdef CIPHER_DEBUG
 913                         printf("<%s>\n",curr->cipher->name);
 914 #endif
 915                         }
 916                 }
 917         OPENSSL_free(co_list);  /* Not needed any longer */
 918
 919         tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack);
 920         if (tmp_cipher_list == NULL)
 921                 {
 922                 sk_SSL_CIPHER_free(cipherstack);
 923                 return NULL;
 924                 }
 925         if (*cipher_list != NULL)
 926                 sk_SSL_CIPHER_free(*cipher_list);
 927         *cipher_list = cipherstack;
 928         if (*cipher_list_by_id != NULL)
 929                 sk_SSL_CIPHER_free(*cipher_list_by_id);
 930         *cipher_list_by_id = tmp_cipher_list;
 931         sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
 932
 933         return(cipherstack);
 934         }
 935
 936 char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
 937         {
 938         int is_export,pkl,kl;
 939         const char *ver,*exp_str;
 940         const char *kx,*au,*enc,*mac;
 941         unsigned long alg,alg2,alg_s;
 942 #ifdef KSSL_DEBUG
 943         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx\n";
 944 #else
 945         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
 946 #endif /* KSSL_DEBUG */
 947
 948         alg=cipher->algorithms;
 949         alg_s=cipher->algo_strength;
 950         alg2=cipher->algorithm2;
 951
 952         is_export=SSL_C_IS_EXPORT(cipher);
 953         pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
 954         kl=SSL_C_EXPORT_KEYLENGTH(cipher);
 955         exp_str=is_export?" export":"";
 956
 957         if (alg & SSL_SSLV2)
 958                 ver="SSLv2";
 959         else if (alg & SSL_SSLV3)
 960                 ver="SSLv3";
 961         else
 962                 ver="unknown";
 963
 964         switch (alg&SSL_MKEY_MASK)
 965                 {
 966         case SSL_kRSA:
 967                 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
 968                 break;
 969         case SSL_kDHr:
 970                 kx="DH/RSA";
 971                 break;
 972         case SSL_kDHd:
 973                 kx="DH/DSS";
 974                 break;
 975         case SSL_kKRB5:         /* VRS */
 976         case SSL_KRB5:          /* VRS */
 977             kx="KRB5";
 978             break;
 979         case SSL_kFZA:
 980                 kx="Fortezza";
 981                 break;
 982         case SSL_kEDH:
 983                 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
 984                 break;
 985         case SSL_kECDH:
 986         case SSL_kECDHE:
 987                 kx=is_export?"ECDH(<=163)":"ECDH";
 988                 break;
 989         default:
 990                 kx="unknown";
 991                 }
 992
 993         switch (alg&SSL_AUTH_MASK)
 994                 {
 995         case SSL_aRSA:
 996                 au="RSA";
 997                 break;
 998         case SSL_aDSS:
 999                 au="DSS";
1000                 break;
1001         case SSL_aDH:
1002                 au="DH";
1003                 break;
1004         case SSL_aKRB5:         /* VRS */
1005         case SSL_KRB5:          /* VRS */
1006             au="KRB5";
1007             break;
1008         case SSL_aFZA:
1009         case SSL_aNULL:
1010                 au="None";
1011                 break;
1012         case SSL_aECDSA:
1013                 au="ECDSA";
1014                 break;
1015         default:
1016                 au="unknown";
1017                 break;
1018                 }
1019
1020         switch (alg&SSL_ENC_MASK)
1021                 {
1022         case SSL_DES:
1023                 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
1024                 break;
1025         case SSL_3DES:
1026                 enc="3DES(168)";
1027                 break;
1028         case SSL_RC4:
1029                 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
1030                   :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
1031                 break;
1032         case SSL_RC2:
1033                 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
1034                 break;
1035         case SSL_IDEA:
1036                 enc="IDEA(128)";
1037                 break;
1038         case SSL_eFZA:
1039                 enc="Fortezza";
1040                 break;
1041         case SSL_eNULL:
1042                 enc="None";
1043                 break;
1044         case SSL_AES:
1045                 switch(cipher->strength_bits)
1046                         {
1047                 case 128: enc="AES(128)"; break;
1048                 case 192: enc="AES(192)"; break;
1049                 case 256: enc="AES(256)"; break;
1050                 default: enc="AES(?""?""?)"; break;
1051                         }
1052                 break;
1053         default:
1054                 enc="unknown";
1055                 break;
1056                 }
1057
1058         switch (alg&SSL_MAC_MASK)
1059                 {
1060         case SSL_MD5:
1061                 mac="MD5";
1062                 break;
1063         case SSL_SHA1:
1064                 mac="SHA1";
1065                 break;
1066         default:
1067                 mac="unknown";
1068                 break;
1069                 }
1070
1071         if (buf == NULL)
1072                 {
1073                 len=128;
1074                 buf=OPENSSL_malloc(len);
1075                 if (buf == NULL) return("OPENSSL_malloc Error");
1076                 }
1077         else if (len < 128)
1078                 return("Buffer too small");
1079
1080 #ifdef KSSL_DEBUG
1081         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg);
1082 #else
1083         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str);
1084 #endif /* KSSL_DEBUG */
1085         return(buf);
1086         }
1087
1088 char *SSL_CIPHER_get_version(const SSL_CIPHER *c)
1089         {
1090         int i;
1091
1092         if (c == NULL) return("(NONE)");
1093         i=(int)(c->id>>24L);
1094         if (i == 3)
1095                 return("TLSv1/SSLv3");
1096         else if (i == 2)
1097                 return("SSLv2");
1098         else
1099                 return("unknown");
1100         }
1101
1102 /* return the actual cipher being used */
1103 const char *SSL_CIPHER_get_name(const SSL_CIPHER *c)
1104         {
1105         if (c != NULL)
1106                 return(c->name);
1107         return("(NONE)");
1108         }
1109
1110 /* number of bits for symmetric cipher */
1111 int SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
1112         {
1113         int ret=0;
1114
1115         if (c != NULL)
1116                 {
1117                 if (alg_bits != NULL) *alg_bits = c->alg_bits;
1118                 ret = c->strength_bits;
1119                 }
1120         return(ret);
1121         }
1122
1123 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
1124         {
1125         SSL_COMP *ctmp;
1126         int i,nn;
1127
1128         if ((n == 0) || (sk == NULL)) return(NULL);
1129         nn=sk_SSL_COMP_num(sk);
1130         for (i=0; i<nn; i++)
1131                 {
1132                 ctmp=sk_SSL_COMP_value(sk,i);
1133                 if (ctmp->id == n)
1134                         return(ctmp);
1135                 }
1136         return(NULL);
1137         }
1138
1139 #ifdef OPENSSL_NO_COMP
1140 void *SSL_COMP_get_compression_methods(void)
1141         {
1142         return NULL;
1143         }
1144 int SSL_COMP_add_compression_method(int id, void *cm)
1145         {
1146         return 1;
1147         }
1148
1149 const char *SSL_COMP_get_name(const void *comp)
1150         {
1151         return NULL;
1152         }
1153 #else
1154 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
1155         {
1156         load_builtin_compressions();
1157         return(ssl_comp_methods);
1158         }
1159
1160 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
1161         {
1162         SSL_COMP *comp;
1163
1164         if (cm == NULL || cm->type == NID_undef)
1165                 return 1;
1166
1167         /* According to draft-ietf-tls-compression-04.txt, the
1168            compression number ranges should be the following:
1169
1170            0 to 63:    methods defined by the IETF
1171            64 to 192:  external party methods assigned by IANA
1172            193 to 255: reserved for private use */
1173         if (id < 193 || id > 255)
1174                 {
1175                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_COMPRESSION_ID_NOT_WITHIN_PRIVATE_RANGE);
1176                 return 0;
1177                 }
1178
1179         MemCheck_off();
1180         comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
1181         comp->id=id;
1182         comp->method=cm;
1183         load_builtin_compressions();
1184         if (ssl_comp_methods
1185                 && !sk_SSL_COMP_find(ssl_comp_methods,comp))
1186                 {
1187                 OPENSSL_free(comp);
1188                 MemCheck_on();
1189                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_DUPLICATE_COMPRESSION_ID);
1190                 return(1);
1191                 }
1192         else if ((ssl_comp_methods == NULL)
1193                 || !sk_SSL_COMP_push(ssl_comp_methods,comp))
1194                 {
1195                 OPENSSL_free(comp);
1196                 MemCheck_on();
1197                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
1198                 return(1);
1199                 }
1200         else
1201                 {
1202                 MemCheck_on();
1203                 return(0);
1204                 }
1205         }
1206
1207 const char *SSL_COMP_get_name(const COMP_METHOD *comp)
1208         {
1209         if (comp)
1210                 return comp->name;
1211         return NULL;
1212         }
1213
1214 #endif