crypto/openssl-0.9/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 static int init_ciphers=1;
 169
 170 static void load_ciphers(void)
 171         {
 172         ssl_cipher_methods[SSL_ENC_DES_IDX]=
 173                 EVP_get_cipherbyname(SN_des_cbc);
 174         ssl_cipher_methods[SSL_ENC_3DES_IDX]=
 175                 EVP_get_cipherbyname(SN_des_ede3_cbc);
 176         ssl_cipher_methods[SSL_ENC_RC4_IDX]=
 177                 EVP_get_cipherbyname(SN_rc4);
 178         ssl_cipher_methods[SSL_ENC_RC2_IDX]=
 179                 EVP_get_cipherbyname(SN_rc2_cbc);
 180 #ifndef OPENSSL_NO_IDEA
 181         ssl_cipher_methods[SSL_ENC_IDEA_IDX]=
 182                 EVP_get_cipherbyname(SN_idea_cbc);
 183 #else
 184         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= NULL;
 185 #endif
 186         ssl_cipher_methods[SSL_ENC_AES128_IDX]=
 187           EVP_get_cipherbyname(SN_aes_128_cbc);
 188         ssl_cipher_methods[SSL_ENC_AES256_IDX]=
 189           EVP_get_cipherbyname(SN_aes_256_cbc);
 190
 191         ssl_digest_methods[SSL_MD_MD5_IDX]=
 192                 EVP_get_digestbyname(SN_md5);
 193         ssl_digest_methods[SSL_MD_SHA1_IDX]=
 194                 EVP_get_digestbyname(SN_sha1);
 195         init_ciphers=0;
 196         }
 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
 238 int ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc,
 239              const EVP_MD **md, SSL_COMP **comp)
 240         {
 241         int i;
 242         SSL_CIPHER *c;
 243
 244         c=s->cipher;
 245         if (c == NULL) return(0);
 246         if (comp != NULL)
 247                 {
 248                 SSL_COMP ctmp;
 249
 250                 load_builtin_compressions();
 251
 252                 *comp=NULL;
 253                 ctmp.id=s->compress_meth;
 254                 if (ssl_comp_methods != NULL)
 255                         {
 256                         i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
 257                         if (i >= 0)
 258                                 *comp=sk_SSL_COMP_value(ssl_comp_methods,i);
 259                         else
 260                                 *comp=NULL;
 261                         }
 262                 }
 263
 264         if ((enc == NULL) || (md == NULL)) return(0);
 265
 266         switch (c->algorithms & SSL_ENC_MASK)
 267                 {
 268         case SSL_DES:
 269                 i=SSL_ENC_DES_IDX;
 270                 break;
 271         case SSL_3DES:
 272                 i=SSL_ENC_3DES_IDX;
 273                 break;
 274         case SSL_RC4:
 275                 i=SSL_ENC_RC4_IDX;
 276                 break;
 277         case SSL_RC2:
 278                 i=SSL_ENC_RC2_IDX;
 279                 break;
 280         case SSL_IDEA:
 281                 i=SSL_ENC_IDEA_IDX;
 282                 break;
 283         case SSL_eNULL:
 284                 i=SSL_ENC_NULL_IDX;
 285                 break;
 286         case SSL_AES:
 287                 switch(c->alg_bits)
 288                         {
 289                 case 128: i=SSL_ENC_AES128_IDX; break;
 290                 case 256: i=SSL_ENC_AES256_IDX; break;
 291                 default: i=-1; break;
 292                         }
 293                 break;
 294         default:
 295                 i= -1;
 296                 break;
 297                 }
 298
 299         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
 300                 *enc=NULL;
 301         else
 302                 {
 303                 if (i == SSL_ENC_NULL_IDX)
 304                         *enc=EVP_enc_null();
 305                 else
 306                         *enc=ssl_cipher_methods[i];
 307                 }
 308
 309         switch (c->algorithms & SSL_MAC_MASK)
 310                 {
 311         case SSL_MD5:
 312                 i=SSL_MD_MD5_IDX;
 313                 break;
 314         case SSL_SHA1:
 315                 i=SSL_MD_SHA1_IDX;
 316                 break;
 317         default:
 318                 i= -1;
 319                 break;
 320                 }
 321         if ((i < 0) || (i > SSL_MD_NUM_IDX))
 322                 *md=NULL;
 323         else
 324                 *md=ssl_digest_methods[i];
 325
 326         if ((*enc != NULL) && (*md != NULL))
 327                 return(1);
 328         else
 329                 return(0);
 330         }
 331
 332 #define ITEM_SEP(a) \
 333         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
 334
 335 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
 336              CIPHER_ORDER **tail)
 337         {
 338         if (curr == *tail) return;
 339         if (curr == *head)
 340                 *head=curr->next;
 341         if (curr->prev != NULL)
 342                 curr->prev->next=curr->next;
 343         if (curr->next != NULL) /* should always be true */
 344                 curr->next->prev=curr->prev;
 345         (*tail)->next=curr;
 346         curr->prev= *tail;
 347         curr->next=NULL;
 348         *tail=curr;
 349         }
 350
 351 static unsigned long ssl_cipher_get_disabled(void)
 352         {
 353         unsigned long mask;
 354
 355         mask = SSL_kFZA;
 356 #ifdef OPENSSL_NO_RSA
 357         mask |= SSL_aRSA|SSL_kRSA;
 358 #endif
 359 #ifdef OPENSSL_NO_DSA
 360         mask |= SSL_aDSS;
 361 #endif
 362 #ifdef OPENSSL_NO_DH
 363         mask |= SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
 364 #endif
 365 #ifdef OPENSSL_NO_KRB5
 366         mask |= SSL_kKRB5|SSL_aKRB5;
 367 #endif
 368 #ifdef OPENSSL_NO_ECDH
 369         mask |= SSL_kECDH|SSL_kECDHE;
 370 #endif
 371 #ifdef SSL_FORBID_ENULL
 372         mask |= SSL_eNULL;
 373 #endif
 374
 375         mask |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
 376         mask |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
 377         mask |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
 378         mask |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
 379         mask |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
 380         mask |= (ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL) ? SSL_eFZA:0;
 381         mask |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES:0;
 382
 383         mask |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
 384         mask |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
 385
 386         return(mask);
 387         }
 388
 389 static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
 390                 int num_of_ciphers, unsigned long mask, CIPHER_ORDER *co_list,
 391                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
 392         {
 393         int i, co_list_num;
 394         SSL_CIPHER *c;
 395
 396         /*
 397          * We have num_of_ciphers descriptions compiled in, depending on the
 398          * method selected (SSLv2 and/or SSLv3, TLSv1 etc).
 399          * These will later be sorted in a linked list with at most num
 400          * entries.
 401          */
 402
 403         /* Get the initial list of ciphers */
 404         co_list_num = 0;        /* actual count of ciphers */
 405         for (i = 0; i < num_of_ciphers; i++)
 406                 {
 407                 c = ssl_method->get_cipher(i);
 408                 /* drop those that use any of that is not available */
 409                 if ((c != NULL) && c->valid && !(c->algorithms & mask))
 410                         {
 411                         co_list[co_list_num].cipher = c;
 412                         co_list[co_list_num].next = NULL;
 413                         co_list[co_list_num].prev = NULL;
 414                         co_list[co_list_num].active = 0;
 415                         co_list_num++;
 416 #ifdef KSSL_DEBUG
 417                         printf("\t%d: %s %lx %lx\n",i,c->name,c->id,c->algorithms);
 418 #endif  /* KSSL_DEBUG */
 419                         /*
 420                         if (!sk_push(ca_list,(char *)c)) goto err;
 421                         */
 422                         }
 423                 }
 424
 425         /*
 426          * Prepare linked list from list entries
 427          */
 428         for (i = 1; i < co_list_num - 1; i++)
 429                 {
 430                 co_list[i].prev = &(co_list[i-1]);
 431                 co_list[i].next = &(co_list[i+1]);
 432                 }
 433         if (co_list_num > 0)
 434                 {
 435                 (*head_p) = &(co_list[0]);
 436                 (*head_p)->prev = NULL;
 437                 (*head_p)->next = &(co_list[1]);
 438                 (*tail_p) = &(co_list[co_list_num - 1]);
 439                 (*tail_p)->prev = &(co_list[co_list_num - 2]);
 440                 (*tail_p)->next = NULL;
 441                 }
 442         }
 443
 444 static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list,
 445                         int num_of_group_aliases, unsigned long mask,
 446                         CIPHER_ORDER *head)
 447         {
 448         CIPHER_ORDER *ciph_curr;
 449         SSL_CIPHER **ca_curr;
 450         int i;
 451
 452         /*
 453          * First, add the real ciphers as already collected
 454          */
 455         ciph_curr = head;
 456         ca_curr = ca_list;
 457         while (ciph_curr != NULL)
 458                 {
 459                 *ca_curr = ciph_curr->cipher;
 460                 ca_curr++;
 461                 ciph_curr = ciph_curr->next;
 462                 }
 463
 464         /*
 465          * Now we add the available ones from the cipher_aliases[] table.
 466          * They represent either an algorithm, that must be fully
 467          * supported (not match any bit in mask) or represent a cipher
 468          * strength value (will be added in any case because algorithms=0).
 469          */
 470         for (i = 0; i < num_of_group_aliases; i++)
 471                 {
 472                 if ((i == 0) ||         /* always fetch "ALL" */
 473                     !(cipher_aliases[i].algorithms & mask))
 474                         {
 475                         *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
 476                         ca_curr++;
 477                         }
 478                 }
 479
 480         *ca_curr = NULL;        /* end of list */
 481         }
 482
 483 static void ssl_cipher_apply_rule(unsigned long algorithms, unsigned long mask,
 484                 unsigned long algo_strength, unsigned long mask_strength,
 485                 int rule, int strength_bits, CIPHER_ORDER *co_list,
 486                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
 487         {
 488         CIPHER_ORDER *head, *tail, *curr, *curr2, *tail2;
 489         SSL_CIPHER *cp;
 490         unsigned long ma, ma_s;
 491
 492 #ifdef CIPHER_DEBUG
 493         printf("Applying rule %d with %08lx %08lx %08lx %08lx (%d)\n",
 494                 rule, algorithms, mask, algo_strength, mask_strength,
 495                 strength_bits);
 496 #endif
 497
 498         curr = head = *head_p;
 499         curr2 = head;
 500         tail2 = tail = *tail_p;
 501         for (;;)
 502                 {
 503                 if ((curr == NULL) || (curr == tail2)) break;
 504                 curr = curr2;
 505                 curr2 = curr->next;
 506
 507                 cp = curr->cipher;
 508
 509                 /*
 510                  * Selection criteria is either the number of strength_bits
 511                  * or the algorithm used.
 512                  */
 513                 if (strength_bits == -1)
 514                         {
 515                         ma = mask & cp->algorithms;
 516                         ma_s = mask_strength & cp->algo_strength;
 517
 518 #ifdef CIPHER_DEBUG
 519                         printf("\nName: %s:\nAlgo = %08lx Algo_strength = %08lx\nMask = %08lx Mask_strength %08lx\n", cp->name, cp->algorithms, cp->algo_strength, mask, mask_strength);
 520                         printf("ma = %08lx ma_s %08lx, ma&algo=%08lx, ma_s&algos=%08lx\n", ma, ma_s, ma&algorithms, ma_s&algo_strength);
 521 #endif
 522                         /*
 523                          * Select: if none of the mask bit was met from the
 524                          * cipher or not all of the bits were met, the
 525                          * selection does not apply.
 526                          */
 527                         if (((ma == 0) && (ma_s == 0)) ||
 528                             ((ma & algorithms) != ma) ||
 529                             ((ma_s & algo_strength) != ma_s))
 530                                 continue; /* does not apply */
 531                         }
 532                 else if (strength_bits != cp->strength_bits)
 533                         continue;       /* does not apply */
 534
 535 #ifdef CIPHER_DEBUG
 536                 printf("Action = %d\n", rule);
 537 #endif
 538
 539                 /* add the cipher if it has not been added yet. */
 540                 if (rule == CIPHER_ADD)
 541                         {
 542                         if (!curr->active)
 543                                 {
 544                                 ll_append_tail(&head, curr, &tail);
 545                                 curr->active = 1;
 546                                 }
 547                         }
 548                 /* Move the added cipher to this location */
 549                 else if (rule == CIPHER_ORD)
 550                         {
 551                         if (curr->active)
 552                                 {
 553                                 ll_append_tail(&head, curr, &tail);
 554                                 }
 555                         }
 556                 else if (rule == CIPHER_DEL)
 557                         curr->active = 0;
 558                 else if (rule == CIPHER_KILL)
 559                         {
 560                         if (head == curr)
 561                                 head = curr->next;
 562                         else
 563                                 curr->prev->next = curr->next;
 564                         if (tail == curr)
 565                                 tail = curr->prev;
 566                         curr->active = 0;
 567                         if (curr->next != NULL)
 568                                 curr->next->prev = curr->prev;
 569                         if (curr->prev != NULL)
 570                                 curr->prev->next = curr->next;
 571                         curr->next = NULL;
 572                         curr->prev = NULL;
 573                         }
 574                 }
 575
 576         *head_p = head;
 577         *tail_p = tail;
 578         }
 579
 580 static int ssl_cipher_strength_sort(CIPHER_ORDER *co_list,
 581                                     CIPHER_ORDER **head_p,
 582                                     CIPHER_ORDER **tail_p)
 583         {
 584         int max_strength_bits, i, *number_uses;
 585         CIPHER_ORDER *curr;
 586
 587         /*
 588          * This routine sorts the ciphers with descending strength. The sorting
 589          * must keep the pre-sorted sequence, so we apply the normal sorting
 590          * routine as '+' movement to the end of the list.
 591          */
 592         max_strength_bits = 0;
 593         curr = *head_p;
 594         while (curr != NULL)
 595                 {
 596                 if (curr->active &&
 597                     (curr->cipher->strength_bits > max_strength_bits))
 598                     max_strength_bits = curr->cipher->strength_bits;
 599                 curr = curr->next;
 600                 }
 601
 602         number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
 603         if (!number_uses)
 604         {
 605                 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
 606                 return(0);
 607         }
 608         memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
 609
 610         /*
 611          * Now find the strength_bits values actually used
 612          */
 613         curr = *head_p;
 614         while (curr != NULL)
 615                 {
 616                 if (curr->active)
 617                         number_uses[curr->cipher->strength_bits]++;
 618                 curr = curr->next;
 619                 }
 620         /*
 621          * Go through the list of used strength_bits values in descending
 622          * order.
 623          */
 624         for (i = max_strength_bits; i >= 0; i--)
 625                 if (number_uses[i] > 0)
 626                         ssl_cipher_apply_rule(0, 0, 0, 0, CIPHER_ORD, i,
 627                                         co_list, head_p, tail_p);
 628
 629         OPENSSL_free(number_uses);
 630         return(1);
 631         }
 632
 633 static int ssl_cipher_process_rulestr(const char *rule_str,
 634                 CIPHER_ORDER *co_list, CIPHER_ORDER **head_p,
 635                 CIPHER_ORDER **tail_p, SSL_CIPHER **ca_list)
 636         {
 637         unsigned long algorithms, mask, algo_strength, mask_strength;
 638         const char *l, *start, *buf;
 639         int j, multi, found, rule, retval, ok, buflen;
 640         char ch;
 641
 642         retval = 1;
 643         l = rule_str;
 644         for (;;)
 645                 {
 646                 ch = *l;
 647
 648                 if (ch == '\0')
 649                         break;          /* done */
 650                 if (ch == '-')
 651                         { rule = CIPHER_DEL; l++; }
 652                 else if (ch == '+')
 653                         { rule = CIPHER_ORD; l++; }
 654                 else if (ch == '!')
 655                         { rule = CIPHER_KILL; l++; }
 656                 else if (ch == '@')
 657                         { rule = CIPHER_SPECIAL; l++; }
 658                 else
 659                         { rule = CIPHER_ADD; }
 660
 661                 if (ITEM_SEP(ch))
 662                         {
 663                         l++;
 664                         continue;
 665                         }
 666
 667                 algorithms = mask = algo_strength = mask_strength = 0;
 668
 669                 start=l;
 670                 for (;;)
 671                         {
 672                         ch = *l;
 673                         buf = l;
 674                         buflen = 0;
 675 #ifndef CHARSET_EBCDIC
 676                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
 677                                 ((ch >= '0') && (ch <= '9')) ||
 678                                 ((ch >= 'a') && (ch <= 'z')) ||
 679                                  (ch == '-'))
 680 #else
 681                         while ( isalnum(ch) || (ch == '-'))
 682 #endif
 683                                  {
 684                                  ch = *(++l);
 685                                  buflen++;
 686                                  }
 687
 688                         if (buflen == 0)
 689                                 {
 690                                 /*
 691                                  * We hit something we cannot deal with,
 692                                  * it is no command or separator nor
 693                                  * alphanumeric, so we call this an error.
 694                                  */
 695                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
 696                                        SSL_R_INVALID_COMMAND);
 697                                 retval = found = 0;
 698                                 l++;
 699                                 break;
 700                                 }
 701
 702                         if (rule == CIPHER_SPECIAL)
 703                                 {
 704                                 found = 0; /* unused -- avoid compiler warning */
 705                                 break;  /* special treatment */
 706                                 }
 707
 708                         /* check for multi-part specification */
 709                         if (ch == '+')
 710                                 {
 711                                 multi=1;
 712                                 l++;
 713                                 }
 714                         else
 715                                 multi=0;
 716
 717                         /*
 718                          * Now search for the cipher alias in the ca_list. Be careful
 719                          * with the strncmp, because the "buflen" limitation
 720                          * will make the rule "ADH:SOME" and the cipher
 721                          * "ADH-MY-CIPHER" look like a match for buflen=3.
 722                          * So additionally check whether the cipher name found
 723                          * has the correct length. We can save a strlen() call:
 724                          * just checking for the '\0' at the right place is
 725                          * sufficient, we have to strncmp() anyway. (We cannot
 726                          * use strcmp(), because buf is not '\0' terminated.)
 727                          */
 728                          j = found = 0;
 729                          while (ca_list[j])
 730                                 {
 731                                 if (!strncmp(buf, ca_list[j]->name, buflen) &&
 732                                     (ca_list[j]->name[buflen] == '\0'))
 733                                         {
 734                                         found = 1;
 735                                         break;
 736                                         }
 737                                 else
 738                                         j++;
 739                                 }
 740                         if (!found)
 741                                 break;  /* ignore this entry */
 742
 743                         /* New algorithms:
 744                          *  1 - any old restrictions apply outside new mask
 745                          *  2 - any new restrictions apply outside old mask
 746                          *  3 - enforce old & new where masks intersect
 747                          */
 748                         algorithms = (algorithms & ~ca_list[j]->mask) |         /* 1 */
 749                                      (ca_list[j]->algorithms & ~mask) |         /* 2 */
 750                                      (algorithms & ca_list[j]->algorithms);     /* 3 */
 751                         mask |= ca_list[j]->mask;
 752                         algo_strength = (algo_strength & ~ca_list[j]->mask_strength) |
 753                                         (ca_list[j]->algo_strength & ~mask_strength) |
 754                                         (algo_strength & ca_list[j]->algo_strength);
 755                         mask_strength |= ca_list[j]->mask_strength;
 756
 757                         if (!multi) break;
 758                         }
 759
 760                 /*
 761                  * Ok, we have the rule, now apply it
 762                  */
 763                 if (rule == CIPHER_SPECIAL)
 764                         {       /* special command */
 765                         ok = 0;
 766                         if ((buflen == 8) &&
 767                                 !strncmp(buf, "STRENGTH", 8))
 768                                 ok = ssl_cipher_strength_sort(co_list,
 769                                         head_p, tail_p);
 770                         else
 771                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
 772                                         SSL_R_INVALID_COMMAND);
 773                         if (ok == 0)
 774                                 retval = 0;
 775                         /*
 776                          * We do not support any "multi" options
 777                          * together with "@", so throw away the
 778                          * rest of the command, if any left, until
 779                          * end or ':' is found.
 780                          */
 781                         while ((*l != '\0') && ITEM_SEP(*l))
 782                                 l++;
 783                         }
 784                 else if (found)
 785                         {
 786                         ssl_cipher_apply_rule(algorithms, mask,
 787                                 algo_strength, mask_strength, rule, -1,
 788                                 co_list, head_p, tail_p);
 789                         }
 790                 else
 791                         {
 792                         while ((*l != '\0') && ITEM_SEP(*l))
 793                                 l++;
 794                         }
 795                 if (*l == '\0') break; /* done */
 796                 }
 797
 798         return(retval);
 799         }
 800
 801 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
 802                 STACK_OF(SSL_CIPHER) **cipher_list,
 803                 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
 804                 const char *rule_str)
 805         {
 806         int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
 807         unsigned long disabled_mask;
 808         STACK_OF(SSL_CIPHER) *cipherstack, *tmp_cipher_list;
 809         const char *rule_p;
 810         CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
 811         SSL_CIPHER **ca_list = NULL;
 812
 813         /*
 814          * Return with error if nothing to do.
 815          */
 816         if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == NULL)
 817                 return NULL;
 818
 819         if (init_ciphers)
 820                 {
 821                 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
 822                 if (init_ciphers) load_ciphers();
 823                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
 824                 }
 825
 826         /*
 827          * To reduce the work to do we only want to process the compiled
 828          * in algorithms, so we first get the mask of disabled ciphers.
 829          */
 830         disabled_mask = ssl_cipher_get_disabled();
 831
 832         /*
 833          * Now we have to collect the available ciphers from the compiled
 834          * in ciphers. We cannot get more than the number compiled in, so
 835          * it is used for allocation.
 836          */
 837         num_of_ciphers = ssl_method->num_ciphers();
 838 #ifdef KSSL_DEBUG
 839         printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers);
 840 #endif    /* KSSL_DEBUG */
 841         co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
 842         if (co_list == NULL)
 843                 {
 844                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
 845                 return(NULL);   /* Failure */
 846                 }
 847
 848         ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, disabled_mask,
 849                                    co_list, &head, &tail);
 850
 851         /*
 852          * We also need cipher aliases for selecting based on the rule_str.
 853          * There might be two types of entries in the rule_str: 1) names
 854          * of ciphers themselves 2) aliases for groups of ciphers.
 855          * For 1) we need the available ciphers and for 2) the cipher
 856          * groups of cipher_aliases added together in one list (otherwise
 857          * we would be happy with just the cipher_aliases table).
 858          */
 859         num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
 860         num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
 861         ca_list =
 862                 (SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
 863         if (ca_list == NULL)
 864                 {
 865                 OPENSSL_free(co_list);
 866                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
 867                 return(NULL);   /* Failure */
 868                 }
 869         ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mask,
 870                                    head);
 871
 872         /*
 873          * If the rule_string begins with DEFAULT, apply the default rule
 874          * before using the (possibly available) additional rules.
 875          */
 876         ok = 1;
 877         rule_p = rule_str;
 878         if (strncmp(rule_str,"DEFAULT",7) == 0)
 879                 {
 880                 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
 881                         co_list, &head, &tail, ca_list);
 882                 rule_p += 7;
 883                 if (*rule_p == ':')
 884                         rule_p++;
 885                 }
 886
 887         if (ok && (strlen(rule_p) > 0))
 888                 ok = ssl_cipher_process_rulestr(rule_p, co_list, &head, &tail,
 889                                                 ca_list);
 890
 891         OPENSSL_free(ca_list);  /* Not needed anymore */
 892
 893         if (!ok)
 894                 {       /* Rule processing failure */
 895                 OPENSSL_free(co_list);
 896                 return(NULL);
 897                 }
 898         /*
 899          * Allocate new "cipherstack" for the result, return with error
 900          * if we cannot get one.
 901          */
 902         if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
 903                 {
 904                 OPENSSL_free(co_list);
 905                 return(NULL);
 906                 }
 907
 908         /*
 909          * The cipher selection for the list is done. The ciphers are added
 910          * to the resulting precedence to the STACK_OF(SSL_CIPHER).
 911          */
 912         for (curr = head; curr != NULL; curr = curr->next)
 913                 {
 914                 if (curr->active)
 915                         {
 916                         sk_SSL_CIPHER_push(cipherstack, curr->cipher);
 917 #ifdef CIPHER_DEBUG
 918                         printf("<%s>\n",curr->cipher->name);
 919 #endif
 920                         }
 921                 }
 922         OPENSSL_free(co_list);  /* Not needed any longer */
 923
 924         tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack);
 925         if (tmp_cipher_list == NULL)
 926                 {
 927                 sk_SSL_CIPHER_free(cipherstack);
 928                 return NULL;
 929                 }
 930         if (*cipher_list != NULL)
 931                 sk_SSL_CIPHER_free(*cipher_list);
 932         *cipher_list = cipherstack;
 933         if (*cipher_list_by_id != NULL)
 934                 sk_SSL_CIPHER_free(*cipher_list_by_id);
 935         *cipher_list_by_id = tmp_cipher_list;
 936         sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
 937
 938         return(cipherstack);
 939         }
 940
 941 char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
 942         {
 943         int is_export,pkl,kl;
 944         const char *ver,*exp_str;
 945         const char *kx,*au,*enc,*mac;
 946         unsigned long alg,alg2,alg_s;
 947 #ifdef KSSL_DEBUG
 948         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx\n";
 949 #else
 950         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
 951 #endif /* KSSL_DEBUG */
 952
 953         alg=cipher->algorithms;
 954         alg_s=cipher->algo_strength;
 955         alg2=cipher->algorithm2;
 956
 957         is_export=SSL_C_IS_EXPORT(cipher);
 958         pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
 959         kl=SSL_C_EXPORT_KEYLENGTH(cipher);
 960         exp_str=is_export?" export":"";
 961
 962         if (alg & SSL_SSLV2)
 963                 ver="SSLv2";
 964         else if (alg & SSL_SSLV3)
 965                 ver="SSLv3";
 966         else
 967                 ver="unknown";
 968
 969         switch (alg&SSL_MKEY_MASK)
 970                 {
 971         case SSL_kRSA:
 972                 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
 973                 break;
 974         case SSL_kDHr:
 975                 kx="DH/RSA";
 976                 break;
 977         case SSL_kDHd:
 978                 kx="DH/DSS";
 979                 break;
 980         case SSL_kKRB5:         /* VRS */
 981         case SSL_KRB5:          /* VRS */
 982             kx="KRB5";
 983             break;
 984         case SSL_kFZA:
 985                 kx="Fortezza";
 986                 break;
 987         case SSL_kEDH:
 988                 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
 989                 break;
 990         case SSL_kECDH:
 991         case SSL_kECDHE:
 992                 kx=is_export?"ECDH(<=163)":"ECDH";
 993                 break;
 994         default:
 995                 kx="unknown";
 996                 }
 997
 998         switch (alg&SSL_AUTH_MASK)
 999                 {
1000         case SSL_aRSA:
1001                 au="RSA";
1002                 break;
1003         case SSL_aDSS:
1004                 au="DSS";
1005                 break;
1006         case SSL_aDH:
1007                 au="DH";
1008                 break;
1009         case SSL_aKRB5:         /* VRS */
1010         case SSL_KRB5:          /* VRS */
1011             au="KRB5";
1012             break;
1013         case SSL_aFZA:
1014         case SSL_aNULL:
1015                 au="None";
1016                 break;
1017         case SSL_aECDSA:
1018                 au="ECDSA";
1019                 break;
1020         default:
1021                 au="unknown";
1022                 break;
1023                 }
1024
1025         switch (alg&SSL_ENC_MASK)
1026                 {
1027         case SSL_DES:
1028                 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
1029                 break;
1030         case SSL_3DES:
1031                 enc="3DES(168)";
1032                 break;
1033         case SSL_RC4:
1034                 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
1035                   :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
1036                 break;
1037         case SSL_RC2:
1038                 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
1039                 break;
1040         case SSL_IDEA:
1041                 enc="IDEA(128)";
1042                 break;
1043         case SSL_eFZA:
1044                 enc="Fortezza";
1045                 break;
1046         case SSL_eNULL:
1047                 enc="None";
1048                 break;
1049         case SSL_AES:
1050                 switch(cipher->strength_bits)
1051                         {
1052                 case 128: enc="AES(128)"; break;
1053                 case 192: enc="AES(192)"; break;
1054                 case 256: enc="AES(256)"; break;
1055                 default: enc="AES(?""?""?)"; break;
1056                         }
1057                 break;
1058         default:
1059                 enc="unknown";
1060                 break;
1061                 }
1062
1063         switch (alg&SSL_MAC_MASK)
1064                 {
1065         case SSL_MD5:
1066                 mac="MD5";
1067                 break;
1068         case SSL_SHA1:
1069                 mac="SHA1";
1070                 break;
1071         default:
1072                 mac="unknown";
1073                 break;
1074                 }
1075
1076         if (buf == NULL)
1077                 {
1078                 len=128;
1079                 buf=OPENSSL_malloc(len);
1080                 if (buf == NULL) return("OPENSSL_malloc Error");
1081                 }
1082         else if (len < 128)
1083                 return("Buffer too small");
1084
1085 #ifdef KSSL_DEBUG
1086         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg);
1087 #else
1088         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str);
1089 #endif /* KSSL_DEBUG */
1090         return(buf);
1091         }
1092
1093 char *SSL_CIPHER_get_version(const SSL_CIPHER *c)
1094         {
1095         int i;
1096
1097         if (c == NULL) return("(NONE)");
1098         i=(int)(c->id>>24L);
1099         if (i == 3)
1100                 return("TLSv1/SSLv3");
1101         else if (i == 2)
1102                 return("SSLv2");
1103         else
1104                 return("unknown");
1105         }
1106
1107 /* return the actual cipher being used */
1108 const char *SSL_CIPHER_get_name(const SSL_CIPHER *c)
1109         {
1110         if (c != NULL)
1111                 return(c->name);
1112         return("(NONE)");
1113         }
1114
1115 /* number of bits for symmetric cipher */
1116 int SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
1117         {
1118         int ret=0;
1119
1120         if (c != NULL)
1121                 {
1122                 if (alg_bits != NULL) *alg_bits = c->alg_bits;
1123                 ret = c->strength_bits;
1124                 }
1125         return(ret);
1126         }
1127
1128 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
1129         {
1130         SSL_COMP *ctmp;
1131         int i,nn;
1132
1133         if ((n == 0) || (sk == NULL)) return(NULL);
1134         nn=sk_SSL_COMP_num(sk);
1135         for (i=0; i<nn; i++)
1136                 {
1137                 ctmp=sk_SSL_COMP_value(sk,i);
1138                 if (ctmp->id == n)
1139                         return(ctmp);
1140                 }
1141         return(NULL);
1142         }
1143
1144 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
1145         {
1146         load_builtin_compressions();
1147         return(ssl_comp_methods);
1148         }
1149
1150 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
1151         {
1152         SSL_COMP *comp;
1153
1154         if (cm == NULL || cm->type == NID_undef)
1155                 return 1;
1156
1157         /* According to draft-ietf-tls-compression-04.txt, the
1158            compression number ranges should be the following:
1159
1160            0 to 63:    methods defined by the IETF
1161            64 to 192:  external party methods assigned by IANA
1162            193 to 255: reserved for private use */
1163         if (id < 193 || id > 255)
1164                 {
1165                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_COMPRESSION_ID_NOT_WITHIN_PRIVATE_RANGE);
1166                 return 0;
1167                 }
1168
1169         MemCheck_off();
1170         comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
1171         comp->id=id;
1172         comp->method=cm;
1173         load_builtin_compressions();
1174         if (ssl_comp_methods
1175                 && !sk_SSL_COMP_find(ssl_comp_methods,comp))
1176                 {
1177                 OPENSSL_free(comp);
1178                 MemCheck_on();
1179                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_DUPLICATE_COMPRESSION_ID);
1180                 return(1);
1181                 }
1182         else if ((ssl_comp_methods == NULL)
1183                 || !sk_SSL_COMP_push(ssl_comp_methods,comp))
1184                 {
1185                 OPENSSL_free(comp);
1186                 MemCheck_on();
1187                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
1188                 return(1);
1189                 }
1190         else
1191                 {
1192                 MemCheck_on();
1193                 return(0);
1194                 }
1195         }
1196
1197 const char *SSL_COMP_get_name(const COMP_METHOD *comp)
1198         {
1199         if (comp)
1200                 return comp->name;
1201         return NULL;
1202         }
1203