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 (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  * ECC cipher suite support in OpenSSL originally developed by
 114  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 115  */
 116 /* ====================================================================
 117  * Copyright 2005 Nokia. All rights reserved.
 118  *
 119  * The portions of the attached software ("Contribution") is developed by
 120  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 121  * license.
 122  *
 123  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 124  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 125  * support (see RFC 4279) to OpenSSL.
 126  *
 127  * No patent licenses or other rights except those expressly stated in
 128  * the OpenSSL open source license shall be deemed granted or received
 129  * expressly, by implication, estoppel, or otherwise.
 130  *
 131  * No assurances are provided by Nokia that the Contribution does not
 132  * infringe the patent or other intellectual property rights of any third
 133  * party or that the license provides you with all the necessary rights
 134  * to make use of the Contribution.
 135  *
 136  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 137  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 138  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 139  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 140  * OTHERWISE.
 141  */
 142
 143 #include <stdio.h>
 144 #include <openssl/objects.h>
 145 #include <openssl/comp.h>
 146 #include "ssl_locl.h"
 147
 148 #define SSL_ENC_DES_IDX         0
 149 #define SSL_ENC_3DES_IDX        1
 150 #define SSL_ENC_RC4_IDX         2
 151 #define SSL_ENC_RC2_IDX         3
 152 #define SSL_ENC_IDEA_IDX        4
 153 #define SSL_ENC_NULL_IDX        5
 154 #define SSL_ENC_AES128_IDX      6
 155 #define SSL_ENC_AES256_IDX      7
 156 #define SSL_ENC_CAMELLIA128_IDX 8
 157 #define SSL_ENC_CAMELLIA256_IDX 9
 158 #define SSL_ENC_GOST89_IDX      10
 159 #define SSL_ENC_NUM_IDX         11
 160
 161
 162 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
 163         NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
 164         };
 165
 166 #define SSL_COMP_NULL_IDX       0
 167 #define SSL_COMP_ZLIB_IDX       1
 168 #define SSL_COMP_NUM_IDX        2
 169
 170 static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
 171
 172 #define SSL_MD_MD5_IDX  0
 173 #define SSL_MD_SHA1_IDX 1
 174 #define SSL_MD_NUM_IDX  2
 175 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
 176         NULL,NULL,
 177         };
 178
 179 #define CIPHER_ADD      1
 180 #define CIPHER_KILL     2
 181 #define CIPHER_DEL      3
 182 #define CIPHER_ORD      4
 183 #define CIPHER_SPECIAL  5
 184
 185 typedef struct cipher_order_st
 186         {
 187         SSL_CIPHER *cipher;
 188         int active;
 189         int dead;
 190         struct cipher_order_st *next,*prev;
 191         } CIPHER_ORDER;
 192
 193 static const SSL_CIPHER cipher_aliases[]={
 194         /* "ALL" doesn't include eNULL (must be specifically enabled) */
 195         {0,SSL_TXT_ALL,0,     0,0,~SSL_eNULL,0,0,0,0,0,0},
 196         /* "COMPLEMENTOFALL" */
 197         {0,SSL_TXT_CMPALL,0,  0,0,SSL_eNULL,0,0,0,0,0,0},
 198
 199         /* "COMPLEMENTOFDEFAULT" (does *not* include ciphersuites not found in ALL!) */
 200         {0,SSL_TXT_CMPDEF,0,  SSL_kEDH|SSL_kEECDH,SSL_aNULL,~SSL_eNULL,0,0,0,0,0,0},
 201
 202         /* key exchange aliases
 203          * (some of those using only a single bit here combine
 204          * multiple key exchange algs according to the RFCs,
 205          * e.g. kEDH combines DHE_DSS and DHE_RSA) */
 206         {0,SSL_TXT_kRSA,0,    SSL_kRSA,  0,0,0,0,0,0,0,0},
 207
 208         {0,SSL_TXT_kDHr,0,    SSL_kDHr,  0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 209         {0,SSL_TXT_kDHd,0,    SSL_kDHd,  0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 210         {0,SSL_TXT_kDH,0,     SSL_kDHr|SSL_kDHd,0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 211         {0,SSL_TXT_kEDH,0,    SSL_kEDH,  0,0,0,0,0,0,0,0},
 212         {0,SSL_TXT_DH,0,      SSL_kDHr|SSL_kDHd|SSL_kEDH,0,0,0,0,0,0,0,0},
 213
 214         {0,SSL_TXT_kKRB5,0,   SSL_kKRB5, 0,0,0,0,0,0,0,0},
 215
 216         {0,SSL_TXT_kECDHr,0,  SSL_kECDHr,0,0,0,0,0,0,0,0},
 217         {0,SSL_TXT_kECDHe,0,  SSL_kECDHe,0,0,0,0,0,0,0,0},
 218         {0,SSL_TXT_kECDH,0,   SSL_kECDHr|SSL_kECDHe,0,0,0,0,0,0,0,0},
 219         {0,SSL_TXT_kEECDH,0,  SSL_kEECDH,0,0,0,0,0,0,0,0},
 220         {0,SSL_TXT_ECDH,0,    SSL_kECDHr|SSL_kECDHe|SSL_kEECDH,0,0,0,0,0,0,0,0},
 221
 222         {0,SSL_TXT_kPSK,0,    SSL_kPSK,  0,0,0,0,0,0,0,0},
 223
 224
 225         /* server authentication aliases */
 226         {0,SSL_TXT_aRSA,0,    0,SSL_aRSA,  0,0,0,0,0,0,0},
 227         {0,SSL_TXT_aDSS,0,    0,SSL_aDSS,  0,0,0,0,0,0,0},
 228         {0,SSL_TXT_DSS,0,     0,SSL_aDSS,   0,0,0,0,0,0,0},
 229         {0,SSL_TXT_aKRB5,0,   0,SSL_aKRB5, 0,0,0,0,0,0,0},
 230         {0,SSL_TXT_aNULL,0,   0,SSL_aNULL, 0,0,0,0,0,0,0},
 231         {0,SSL_TXT_aDH,0,     0,SSL_aDH,   0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 232         {0,SSL_TXT_aECDH,0,   0,SSL_aECDH, 0,0,0,0,0,0,0},
 233         {0,SSL_TXT_aECDSA,0,  0,SSL_aECDSA,0,0,0,0,0,0,0},
 234         {0,SSL_TXT_ECDSA,0,   0,SSL_aECDSA, 0,0,0,0,0,0,0},
 235         {0,SSL_TXT_aPSK,0,    0,SSL_aPSK,  0,0,0,0,0,0,0},
 236
 237
 238         /* aliases combining key exchange and server authentication */
 239         {0,SSL_TXT_EDH,0,     SSL_kEDH,~SSL_aNULL,0,0,0,0,0,0,0},
 240         {0,SSL_TXT_EECDH,0,   SSL_kEECDH,~SSL_aNULL,0,0,0,0,0,0,0},
 241         {0,SSL_TXT_NULL,0,    0,0,SSL_eNULL, 0,0,0,0,0,0},
 242         {0,SSL_TXT_KRB5,0,    SSL_kKRB5,SSL_aKRB5,0,0,0,0,0,0,0},
 243         {0,SSL_TXT_RSA,0,     SSL_kRSA,SSL_aRSA,0,0,0,0,0,0,0},
 244         {0,SSL_TXT_ADH,0,     SSL_kEDH,SSL_aNULL,0,0,0,0,0,0,0},
 245         {0,SSL_TXT_AECDH,0,   SSL_kEECDH,SSL_aNULL,0,0,0,0,0,0,0},
 246         {0,SSL_TXT_PSK,0,     SSL_kPSK,SSL_aPSK,0,0,0,0,0,0,0},
 247
 248
 249         /* symmetric encryption aliases */
 250         {0,SSL_TXT_DES,0,     0,0,SSL_DES,   0,0,0,0,0,0},
 251         {0,SSL_TXT_3DES,0,    0,0,SSL_3DES,  0,0,0,0,0,0},
 252         {0,SSL_TXT_RC4,0,     0,0,SSL_RC4,   0,0,0,0,0,0},
 253         {0,SSL_TXT_RC2,0,     0,0,SSL_RC2,   0,0,0,0,0,0},
 254         {0,SSL_TXT_IDEA,0,    0,0,SSL_IDEA,  0,0,0,0,0,0},
 255         {0,SSL_TXT_eNULL,0,   0,0,SSL_eNULL, 0,0,0,0,0,0},
 256         {0,SSL_TXT_AES128,0,  0,0,SSL_AES128,0,0,0,0,0,0},
 257         {0,SSL_TXT_AES256,0,  0,0,SSL_AES256,0,0,0,0,0,0},
 258         {0,SSL_TXT_AES,0,     0,0,SSL_AES128|SSL_AES256,0,0,0,0,0,0},
 259         {0,SSL_TXT_CAMELLIA128,0,0,0,SSL_CAMELLIA128,0,0,0,0,0,0},
 260         {0,SSL_TXT_CAMELLIA256,0,0,0,SSL_CAMELLIA256,0,0,0,0,0,0},
 261         {0,SSL_TXT_CAMELLIA   ,0,0,0,SSL_CAMELLIA128|SSL_CAMELLIA256,0,0,0,0,0,0},
 262
 263         /* MAC aliases */
 264         {0,SSL_TXT_MD5,0,     0,0,0,SSL_MD5,   0,0,0,0,0},
 265         {0,SSL_TXT_SHA1,0,    0,0,0,SSL_SHA1,  0,0,0,0,0},
 266         {0,SSL_TXT_SHA,0,     0,0,0,SSL_SHA1,  0,0,0,0,0},
 267
 268         /* protocol version aliases */
 269         {0,SSL_TXT_SSLV2,0,   0,0,0,0,SSL_SSLV2, 0,0,0,0},
 270         {0,SSL_TXT_SSLV3,0,   0,0,0,0,SSL_SSLV3, 0,0,0,0},
 271         {0,SSL_TXT_TLSV1,0,   0,0,0,0,SSL_TLSV1, 0,0,0,0},
 272
 273         /* export flag */
 274         {0,SSL_TXT_EXP,0,     0,0,0,0,0,SSL_EXPORT,0,0,0},
 275         {0,SSL_TXT_EXPORT,0,  0,0,0,0,0,SSL_EXPORT,0,0,0},
 276
 277         /* strength classes */
 278         {0,SSL_TXT_EXP40,0,   0,0,0,0,0,SSL_EXP40, 0,0,0},
 279         {0,SSL_TXT_EXP56,0,   0,0,0,0,0,SSL_EXP56, 0,0,0},
 280         {0,SSL_TXT_LOW,0,     0,0,0,0,0,SSL_LOW,   0,0,0},
 281         {0,SSL_TXT_MEDIUM,0,  0,0,0,0,0,SSL_MEDIUM,0,0,0},
 282         {0,SSL_TXT_HIGH,0,    0,0,0,0,0,SSL_HIGH,  0,0,0},
 283         };
 284
 285 void ssl_load_ciphers(void)
 286         {
 287         ssl_cipher_methods[SSL_ENC_DES_IDX]=
 288                 EVP_get_cipherbyname(SN_des_cbc);
 289         ssl_cipher_methods[SSL_ENC_3DES_IDX]=
 290                 EVP_get_cipherbyname(SN_des_ede3_cbc);
 291         ssl_cipher_methods[SSL_ENC_RC4_IDX]=
 292                 EVP_get_cipherbyname(SN_rc4);
 293         ssl_cipher_methods[SSL_ENC_RC2_IDX]=
 294                 EVP_get_cipherbyname(SN_rc2_cbc);
 295 #ifndef OPENSSL_NO_IDEA
 296         ssl_cipher_methods[SSL_ENC_IDEA_IDX]=
 297                 EVP_get_cipherbyname(SN_idea_cbc);
 298 #else
 299         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= NULL;
 300 #endif
 301         ssl_cipher_methods[SSL_ENC_AES128_IDX]=
 302           EVP_get_cipherbyname(SN_aes_128_cbc);
 303         ssl_cipher_methods[SSL_ENC_AES256_IDX]=
 304           EVP_get_cipherbyname(SN_aes_256_cbc);
 305         ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX]=
 306           EVP_get_cipherbyname(SN_camellia_128_cbc);
 307         ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX]=
 308           EVP_get_cipherbyname(SN_camellia_256_cbc);
 309         ssl_cipher_methods[SSL_ENC_GOST89_IDX]=
 310                 EVP_get_cipherbyname(SN_gost89_cnt);
 311
 312         ssl_digest_methods[SSL_MD_MD5_IDX]=
 313                 EVP_get_digestbyname(SN_md5);
 314         ssl_digest_methods[SSL_MD_SHA1_IDX]=
 315                 EVP_get_digestbyname(SN_sha1);
 316         }
 317
 318
 319 #ifndef OPENSSL_NO_COMP
 320
 321 static int sk_comp_cmp(const SSL_COMP * const *a,
 322                         const SSL_COMP * const *b)
 323         {
 324         return((*a)->id-(*b)->id);
 325         }
 326
 327 static void load_builtin_compressions(void)
 328         {
 329         int got_write_lock = 0;
 330
 331         CRYPTO_r_lock(CRYPTO_LOCK_SSL);
 332         if (ssl_comp_methods == NULL)
 333                 {
 334                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
 335                 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
 336                 got_write_lock = 1;
 337
 338                 if (ssl_comp_methods == NULL)
 339                         {
 340                         SSL_COMP *comp = NULL;
 341
 342                         MemCheck_off();
 343                         ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
 344                         if (ssl_comp_methods != NULL)
 345                                 {
 346                                 comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
 347                                 if (comp != NULL)
 348                                         {
 349                                         comp->method=COMP_zlib();
 350                                         if (comp->method
 351                                                 && comp->method->type == NID_undef)
 352                                                 OPENSSL_free(comp);
 353                                         else
 354                                                 {
 355                                                 comp->id=SSL_COMP_ZLIB_IDX;
 356                                                 comp->name=comp->method->name;
 357                                                 sk_SSL_COMP_push(ssl_comp_methods,comp);
 358                                                 }
 359                                         }
 360                                 }
 361                         MemCheck_on();
 362                         }
 363                 }
 364
 365         if (got_write_lock)
 366                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
 367         else
 368                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
 369         }
 370 #endif
 371
 372 int ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc,
 373              const EVP_MD **md, SSL_COMP **comp)
 374         {
 375         int i;
 376         SSL_CIPHER *c;
 377
 378         c=s->cipher;
 379         if (c == NULL) return(0);
 380         if (comp != NULL)
 381                 {
 382                 SSL_COMP ctmp;
 383 #ifndef OPENSSL_NO_COMP
 384                 load_builtin_compressions();
 385 #endif
 386
 387                 *comp=NULL;
 388                 ctmp.id=s->compress_meth;
 389                 if (ssl_comp_methods != NULL)
 390                         {
 391                         i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
 392                         if (i >= 0)
 393                                 *comp=sk_SSL_COMP_value(ssl_comp_methods,i);
 394                         else
 395                                 *comp=NULL;
 396                         }
 397                 }
 398
 399         if ((enc == NULL) || (md == NULL)) return(0);
 400
 401         switch (c->algorithm_enc)
 402                 {
 403         case SSL_DES:
 404                 i=SSL_ENC_DES_IDX;
 405                 break;
 406         case SSL_3DES:
 407                 i=SSL_ENC_3DES_IDX;
 408                 break;
 409         case SSL_RC4:
 410                 i=SSL_ENC_RC4_IDX;
 411                 break;
 412         case SSL_RC2:
 413                 i=SSL_ENC_RC2_IDX;
 414                 break;
 415         case SSL_IDEA:
 416                 i=SSL_ENC_IDEA_IDX;
 417                 break;
 418         case SSL_eNULL:
 419                 i=SSL_ENC_NULL_IDX;
 420                 break;
 421         case SSL_AES128:
 422                 i=SSL_ENC_AES128_IDX;
 423                 break;
 424         case SSL_AES256:
 425                 i=SSL_ENC_AES256_IDX;
 426                 break;
 427         case SSL_CAMELLIA128:
 428                 i=SSL_ENC_CAMELLIA128_IDX;
 429                 break;
 430         case SSL_CAMELLIA256:
 431                 i=SSL_ENC_CAMELLIA256_IDX;
 432                 break;
 433         case SSL_eGOST2814789CNT:
 434                 i=SSL_ENC_GOST89_IDX;
 435                 break;
 436         default:
 437                 i= -1;
 438                 break;
 439                 }
 440
 441         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
 442                 *enc=NULL;
 443         else
 444                 {
 445                 if (i == SSL_ENC_NULL_IDX)
 446                         *enc=EVP_enc_null();
 447                 else
 448                         *enc=ssl_cipher_methods[i];
 449                 }
 450
 451         switch (c->algorithm_mac)
 452                 {
 453         case SSL_MD5:
 454                 i=SSL_MD_MD5_IDX;
 455                 break;
 456         case SSL_SHA1:
 457                 i=SSL_MD_SHA1_IDX;
 458                 break;
 459         default:
 460                 i= -1;
 461                 break;
 462                 }
 463         if ((i < 0) || (i > SSL_MD_NUM_IDX))
 464                 *md=NULL;
 465         else
 466                 *md=ssl_digest_methods[i];
 467
 468         if ((*enc != NULL) && (*md != NULL))
 469                 return(1);
 470         else
 471                 return(0);
 472         }
 473
 474 #define ITEM_SEP(a) \
 475         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
 476
 477 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
 478              CIPHER_ORDER **tail)
 479         {
 480         if (curr == *tail) return;
 481         if (curr == *head)
 482                 *head=curr->next;
 483         if (curr->prev != NULL)
 484                 curr->prev->next=curr->next;
 485         if (curr->next != NULL)
 486                 curr->next->prev=curr->prev;
 487         (*tail)->next=curr;
 488         curr->prev= *tail;
 489         curr->next=NULL;
 490         *tail=curr;
 491         }
 492
 493 static void ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr,
 494              CIPHER_ORDER **tail)
 495         {
 496         if (curr == *head) return;
 497         if (curr == *tail)
 498                 *tail=curr->prev;
 499         if (curr->next != NULL)
 500                 curr->next->prev=curr->prev;
 501         if (curr->prev != NULL)
 502                 curr->prev->next=curr->next;
 503         (*head)->prev=curr;
 504         curr->next= *head;
 505         curr->prev=NULL;
 506         *head=curr;
 507         }
 508
 509 static void ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth, unsigned long *enc, unsigned long *mac, unsigned long *ssl)
 510         {
 511         *mkey = 0;
 512         *auth = 0;
 513         *enc = 0;
 514         *mac = 0;
 515         *ssl = 0;
 516
 517 #ifdef OPENSSL_NO_RSA
 518         *mkey |= SSL_kRSA;
 519         *auth |= SSL_aRSA;
 520 #endif
 521 #ifdef OPENSSL_NO_DSA
 522         *auth |= SSL_aDSS;
 523 #endif
 524         *mkey |= SSL_kDHr|SSL_kDHd; /* no such ciphersuites supported! */
 525         *auth |= SSL_aDH;
 526 #ifdef OPENSSL_NO_DH
 527         *mkey |= SSL_kDHr|SSL_kDHd|SSL_kEDH;
 528         *auth |= SSL_aDH;
 529 #endif
 530 #ifdef OPENSSL_NO_KRB5
 531         *mkey |= SSL_kKRB5;
 532         *auth |= SSL_aKRB5;
 533 #endif
 534 #ifdef OPENSSL_NO_ECDSA
 535         *auth |= SSL_aECDSA;
 536 #endif
 537 #ifdef OPENSSL_NO_ECDH
 538         *mkey |= SSL_kECDHe|SSL_kECDHr;
 539         *auth |= SSL_aECDH;
 540 #endif
 541 #ifdef OPENSSL_NO_PSK
 542         *mkey |= SSL_kPSK;
 543         *auth |= SSL_aPSK;
 544 #endif
 545 #ifdef SSL_FORBID_ENULL
 546         *enc |= SSL_eNULL;
 547 #endif
 548
 549         *enc |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
 550         *enc |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
 551         *enc |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
 552         *enc |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
 553         *enc |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
 554         *enc |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES128:0;
 555         *enc |= (ssl_cipher_methods[SSL_ENC_AES256_IDX] == NULL) ? SSL_AES256:0;
 556         *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] == NULL) ? SSL_CAMELLIA128:0;
 557         *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] == NULL) ? SSL_CAMELLIA256:0;
 558         *enc |= (ssl_cipher_methods[SSL_ENC_GOST89_IDX] == NULL) ? SSL_eGOST2814789CNT:0;
 559
 560         *mac |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
 561         *mac |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
 562         }
 563
 564 static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
 565                 int num_of_ciphers,
 566                 unsigned long disabled_mkey, unsigned long disabled_auth,
 567                 unsigned long disabled_enc, unsigned long disabled_mac,
 568                 unsigned long disabled_ssl,
 569                 CIPHER_ORDER *co_list,
 570                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
 571         {
 572         int i, co_list_num;
 573         SSL_CIPHER *c;
 574
 575         /*
 576          * We have num_of_ciphers descriptions compiled in, depending on the
 577          * method selected (SSLv2 and/or SSLv3, TLSv1 etc).
 578          * These will later be sorted in a linked list with at most num
 579          * entries.
 580          */
 581
 582         /* Get the initial list of ciphers */
 583         co_list_num = 0;        /* actual count of ciphers */
 584         for (i = 0; i < num_of_ciphers; i++)
 585                 {
 586                 c = ssl_method->get_cipher(i);
 587                 /* drop those that use any of that is not available */
 588                 if ((c != NULL) && c->valid &&
 589                     !(c->algorithm_mkey & disabled_mkey) &&
 590                     !(c->algorithm_auth & disabled_auth) &&
 591                     !(c->algorithm_enc & disabled_enc) &&
 592                     !(c->algorithm_mac & disabled_mac) &&
 593                     !(c->algorithm_ssl & disabled_ssl))
 594                         {
 595                         co_list[co_list_num].cipher = c;
 596                         co_list[co_list_num].next = NULL;
 597                         co_list[co_list_num].prev = NULL;
 598                         co_list[co_list_num].active = 0;
 599                         co_list_num++;
 600 #ifdef KSSL_DEBUG
 601                         printf("\t%d: %s %lx %lx %lx\n",i,c->name,c->id,c->algorithm_mkey,c->algorithm_auth);
 602 #endif  /* KSSL_DEBUG */
 603                         /*
 604                         if (!sk_push(ca_list,(char *)c)) goto err;
 605                         */
 606                         }
 607                 }
 608
 609         /*
 610          * Prepare linked list from list entries
 611          */
 612         if (co_list_num > 0)
 613                 {
 614                 co_list[0].prev = NULL;
 615
 616                 if (co_list_num > 1)
 617                         {
 618                         co_list[0].next = &co_list[1];
 619
 620                         for (i = 1; i < co_list_num - 1; i++)
 621                                 {
 622                                 co_list[i].prev = &co_list[i - 1];
 623                                 co_list[i].next = &co_list[i + 1];
 624                                 }
 625
 626                         co_list[co_list_num - 1].prev = &co_list[co_list_num - 2];
 627                         }
 628
 629                 co_list[co_list_num - 1].next = NULL;
 630
 631                 *head_p = &co_list[0];
 632                 *tail_p = &co_list[co_list_num - 1];
 633                 }
 634         }
 635
 636 static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list,
 637                         int num_of_group_aliases,
 638                         unsigned long disabled_mkey, unsigned long disabled_auth,
 639                         unsigned long disabled_enc, unsigned long disabled_mac,
 640                         unsigned long disabled_ssl,
 641                         CIPHER_ORDER *head)
 642         {
 643         CIPHER_ORDER *ciph_curr;
 644         SSL_CIPHER **ca_curr;
 645         int i;
 646         unsigned long mask_mkey = ~disabled_mkey;
 647         unsigned long mask_auth = ~disabled_auth;
 648         unsigned long mask_enc = ~disabled_enc;
 649         unsigned long mask_mac = ~disabled_mac;
 650         unsigned long mask_ssl = ~disabled_ssl;
 651
 652         /*
 653          * First, add the real ciphers as already collected
 654          */
 655         ciph_curr = head;
 656         ca_curr = ca_list;
 657         while (ciph_curr != NULL)
 658                 {
 659                 *ca_curr = ciph_curr->cipher;
 660                 ca_curr++;
 661                 ciph_curr = ciph_curr->next;
 662                 }
 663
 664         /*
 665          * Now we add the available ones from the cipher_aliases[] table.
 666          * They represent either one or more algorithms, some of which
 667          * in any affected category must be supported (set in enabled_mask),
 668          * or represent a cipher strength value (will be added in any case because algorithms=0).
 669          */
 670         for (i = 0; i < num_of_group_aliases; i++)
 671                 {
 672                 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey;
 673                 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth;
 674                 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc;
 675                 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac;
 676                 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl;
 677
 678                 if (algorithm_mkey)
 679                         if ((algorithm_mkey & mask_mkey) == 0)
 680                                 continue;
 681
 682                 if (algorithm_auth)
 683                         if ((algorithm_auth & mask_auth) == 0)
 684                                 continue;
 685
 686                 if (algorithm_enc)
 687                         if ((algorithm_enc & mask_enc) == 0)
 688                                 continue;
 689
 690                 if (algorithm_mac)
 691                         if ((algorithm_mac & mask_mac) == 0)
 692                                 continue;
 693
 694                 if (algorithm_ssl)
 695                         if ((algorithm_ssl & mask_ssl) == 0)
 696                                 continue;
 697
 698                 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
 699                 ca_curr++;
 700                 }
 701
 702         *ca_curr = NULL;        /* end of list */
 703         }
 704
 705 static void ssl_cipher_apply_rule(unsigned long cipher_id,
 706                 unsigned long alg_mkey, unsigned long alg_auth,
 707                 unsigned long alg_enc, unsigned long alg_mac,
 708                 unsigned long alg_ssl,
 709                 unsigned long algo_strength,
 710                 int rule, int strength_bits,
 711                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
 712         {
 713         CIPHER_ORDER *head, *tail, *curr, *curr2, *last;
 714         SSL_CIPHER *cp;
 715         int reverse = 0;
 716
 717 #ifdef CIPHER_DEBUG
 718         printf("Applying rule %d with %08lx/%08lx/%08lx/%08lx/%08lx %08lx (%d)\n",
 719                 rule, alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength, strength_bits);
 720 #endif
 721
 722         if (rule == CIPHER_DEL)
 723                 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */
 724
 725         head = *head_p;
 726         tail = *tail_p;
 727
 728         if (reverse)
 729                 {
 730                 curr = tail;
 731                 last = head;
 732                 }
 733         else
 734                 {
 735                 curr = head;
 736                 last = tail;
 737                 }
 738
 739         curr2 = curr;
 740         for (;;)
 741                 {
 742                 if ((curr == NULL) || (curr == last)) break;
 743                 curr = curr2;
 744                 curr2 = reverse ? curr->prev : curr->next;
 745
 746                 cp = curr->cipher;
 747
 748                 /*
 749                  * Selection criteria is either the value of strength_bits
 750                  * or the algorithms used.
 751                  */
 752                 if (strength_bits >= 0)
 753                         {
 754                         if (strength_bits != cp->strength_bits)
 755                                 continue;
 756                         }
 757                 else
 758                         {
 759 #ifdef CIPHER_DEBUG
 760                         printf("\nName: %s:\nAlgo = %08lx/%08lx/%08lx/%08lx/%08lx Algo_strength = %08lx\n", cp->name, cp->algorithm_mkey, cp->algorithm_auth, cp->algorithm_enc, cp->algorithm_mac, cp->algorithm_ssl, cp->algo_strength);
 761 #endif
 762
 763                         if (alg_mkey && !(alg_mkey & cp->algorithm_mkey))
 764                                 continue;
 765                         if (alg_auth && !(alg_auth & cp->algorithm_auth))
 766                                 continue;
 767                         if (alg_enc && !(alg_enc & cp->algorithm_enc))
 768                                 continue;
 769                         if (alg_mac && !(alg_mac & cp->algorithm_mac))
 770                                 continue;
 771                         if (alg_ssl && !(alg_ssl & cp->algorithm_ssl))
 772                                 continue;
 773                         if ((algo_strength & SSL_EXP_MASK) && !(algo_strength & SSL_EXP_MASK & cp->algo_strength))
 774                                 continue;
 775                         if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
 776                                 continue;
 777                         }
 778
 779 #ifdef CIPHER_DEBUG
 780                 printf("Action = %d\n", rule);
 781 #endif
 782
 783                 /* add the cipher if it has not been added yet. */
 784                 if (rule == CIPHER_ADD)
 785                         {
 786                         /* reverse == 0 */
 787                         if (!curr->active)
 788                                 {
 789                                 ll_append_tail(&head, curr, &tail);
 790                                 curr->active = 1;
 791                                 }
 792                         }
 793                 /* Move the added cipher to this location */
 794                 else if (rule == CIPHER_ORD)
 795                         {
 796                         /* reverse == 0 */
 797                         if (curr->active)
 798                                 {
 799                                 ll_append_tail(&head, curr, &tail);
 800                                 }
 801                         }
 802                 else if (rule == CIPHER_DEL)
 803                         {
 804                         /* reverse == 1 */
 805                         if (curr->active)
 806                                 {
 807                                 /* most recently deleted ciphersuites get best positions
 808                                  * for any future CIPHER_ADD (note that the CIPHER_DEL loop
 809                                  * works in reverse to maintain the order) */
 810                                 ll_append_head(&head, curr, &tail);
 811                                 curr->active = 0;
 812                                 }
 813                         }
 814                 else if (rule == CIPHER_KILL)
 815                         {
 816                         /* reverse == 0 */
 817                         if (head == curr)
 818                                 head = curr->next;
 819                         else
 820                                 curr->prev->next = curr->next;
 821                         if (tail == curr)
 822                                 tail = curr->prev;
 823                         curr->active = 0;
 824                         if (curr->next != NULL)
 825                                 curr->next->prev = curr->prev;
 826                         if (curr->prev != NULL)
 827                                 curr->prev->next = curr->next;
 828                         curr->next = NULL;
 829                         curr->prev = NULL;
 830                         }
 831                 }
 832
 833         *head_p = head;
 834         *tail_p = tail;
 835         }
 836
 837 static int ssl_cipher_strength_sort(CIPHER_ORDER **head_p,
 838                                     CIPHER_ORDER **tail_p)
 839         {
 840         int max_strength_bits, i, *number_uses;
 841         CIPHER_ORDER *curr;
 842
 843         /*
 844          * This routine sorts the ciphers with descending strength. The sorting
 845          * must keep the pre-sorted sequence, so we apply the normal sorting
 846          * routine as '+' movement to the end of the list.
 847          */
 848         max_strength_bits = 0;
 849         curr = *head_p;
 850         while (curr != NULL)
 851                 {
 852                 if (curr->active &&
 853                     (curr->cipher->strength_bits > max_strength_bits))
 854                     max_strength_bits = curr->cipher->strength_bits;
 855                 curr = curr->next;
 856                 }
 857
 858         number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
 859         if (!number_uses)
 860                 {
 861                 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
 862                 return(0);
 863                 }
 864         memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
 865
 866         /*
 867          * Now find the strength_bits values actually used
 868          */
 869         curr = *head_p;
 870         while (curr != NULL)
 871                 {
 872                 if (curr->active)
 873                         number_uses[curr->cipher->strength_bits]++;
 874                 curr = curr->next;
 875                 }
 876         /*
 877          * Go through the list of used strength_bits values in descending
 878          * order.
 879          */
 880         for (i = max_strength_bits; i >= 0; i--)
 881                 if (number_uses[i] > 0)
 882                         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p);
 883
 884         OPENSSL_free(number_uses);
 885         return(1);
 886         }
 887
 888 static int ssl_cipher_process_rulestr(const char *rule_str,
 889                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p,
 890                 SSL_CIPHER **ca_list)
 891         {
 892         unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength;
 893         const char *l, *start, *buf;
 894         int j, multi, found, rule, retval, ok, buflen;
 895         unsigned long cipher_id = 0;
 896         char ch;
 897
 898         retval = 1;
 899         l = rule_str;
 900         for (;;)
 901                 {
 902                 ch = *l;
 903
 904                 if (ch == '\0')
 905                         break;          /* done */
 906                 if (ch == '-')
 907                         { rule = CIPHER_DEL; l++; }
 908                 else if (ch == '+')
 909                         { rule = CIPHER_ORD; l++; }
 910                 else if (ch == '!')
 911                         { rule = CIPHER_KILL; l++; }
 912                 else if (ch == '@')
 913                         { rule = CIPHER_SPECIAL; l++; }
 914                 else
 915                         { rule = CIPHER_ADD; }
 916
 917                 if (ITEM_SEP(ch))
 918                         {
 919                         l++;
 920                         continue;
 921                         }
 922
 923                 alg_mkey = 0;
 924                 alg_auth = 0;
 925                 alg_enc = 0;
 926                 alg_mac = 0;
 927                 alg_ssl = 0;
 928                 algo_strength = 0;
 929
 930                 start=l;
 931                 for (;;)
 932                         {
 933                         ch = *l;
 934                         buf = l;
 935                         buflen = 0;
 936 #ifndef CHARSET_EBCDIC
 937                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
 938                                 ((ch >= '0') && (ch <= '9')) ||
 939                                 ((ch >= 'a') && (ch <= 'z')) ||
 940                                  (ch == '-'))
 941 #else
 942                         while ( isalnum(ch) || (ch == '-'))
 943 #endif
 944                                  {
 945                                  ch = *(++l);
 946                                  buflen++;
 947                                  }
 948
 949                         if (buflen == 0)
 950                                 {
 951                                 /*
 952                                  * We hit something we cannot deal with,
 953                                  * it is no command or separator nor
 954                                  * alphanumeric, so we call this an error.
 955                                  */
 956                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
 957                                        SSL_R_INVALID_COMMAND);
 958                                 retval = found = 0;
 959                                 l++;
 960                                 break;
 961                                 }
 962
 963                         if (rule == CIPHER_SPECIAL)
 964                                 {
 965                                 found = 0; /* unused -- avoid compiler warning */
 966                                 break;  /* special treatment */
 967                                 }
 968
 969                         /* check for multi-part specification */
 970                         if (ch == '+')
 971                                 {
 972                                 multi=1;
 973                                 l++;
 974                                 }
 975                         else
 976                                 multi=0;
 977
 978                         /*
 979                          * Now search for the cipher alias in the ca_list. Be careful
 980                          * with the strncmp, because the "buflen" limitation
 981                          * will make the rule "ADH:SOME" and the cipher
 982                          * "ADH-MY-CIPHER" look like a match for buflen=3.
 983                          * So additionally check whether the cipher name found
 984                          * has the correct length. We can save a strlen() call:
 985                          * just checking for the '\0' at the right place is
 986                          * sufficient, we have to strncmp() anyway. (We cannot
 987                          * use strcmp(), because buf is not '\0' terminated.)
 988                          */
 989                         j = found = 0;
 990                         cipher_id = 0;
 991                         while (ca_list[j])
 992                                 {
 993                                 if (!strncmp(buf, ca_list[j]->name, buflen) &&
 994                                     (ca_list[j]->name[buflen] == '\0'))
 995                                         {
 996                                         found = 1;
 997                                         break;
 998                                         }
 999                                 else
1000                                         j++;
1001                                 }
1002
1003                         if (!found)
1004                                 break;  /* ignore this entry */
1005
1006                         if (ca_list[j]->algorithm_mkey)
1007                                 {
1008                                 if (alg_mkey)
1009                                         {
1010                                         alg_mkey &= ca_list[j]->algorithm_mkey;
1011                                         if (!alg_mkey) { found = 0; break; }
1012                                         }
1013                                 else
1014                                         alg_mkey = ca_list[j]->algorithm_mkey;
1015                                 }
1016
1017                         if (ca_list[j]->algorithm_auth)
1018                                 {
1019                                 if (alg_auth)
1020                                         {
1021                                         alg_auth &= ca_list[j]->algorithm_auth;
1022                                         if (!alg_auth) { found = 0; break; }
1023                                         }
1024                                 else
1025                                         alg_auth = ca_list[j]->algorithm_auth;
1026                                 }
1027
1028                         if (ca_list[j]->algorithm_enc)
1029                                 {
1030                                 if (alg_enc)
1031                                         {
1032                                         alg_enc &= ca_list[j]->algorithm_enc;
1033                                         if (!alg_enc) { found = 0; break; }
1034                                         }
1035                                 else
1036                                         alg_enc = ca_list[j]->algorithm_enc;
1037                                 }
1038
1039                         if (ca_list[j]->algorithm_mac)
1040                                 {
1041                                 if (alg_mac)
1042                                         {
1043                                         alg_mac &= ca_list[j]->algorithm_mac;
1044                                         if (!alg_mac) { found = 0; break; }
1045                                         }
1046                                 else
1047                                         alg_mac = ca_list[j]->algorithm_mac;
1048                                 }
1049
1050                         if (ca_list[j]->algo_strength & SSL_EXP_MASK)
1051                                 {
1052                                 if (algo_strength & SSL_EXP_MASK)
1053                                         {
1054                                         algo_strength &= (ca_list[j]->algo_strength & SSL_EXP_MASK) | ~SSL_EXP_MASK;
1055                                         if (!(algo_strength & SSL_EXP_MASK)) { found = 0; break; }
1056                                         }
1057                                 else
1058                                         algo_strength |= ca_list[j]->algo_strength & SSL_EXP_MASK;
1059                                 }
1060
1061                         if (ca_list[j]->algo_strength & SSL_STRONG_MASK)
1062                                 {
1063                                 if (algo_strength & SSL_STRONG_MASK)
1064                                         {
1065                                         algo_strength &= (ca_list[j]->algo_strength & SSL_STRONG_MASK) | ~SSL_STRONG_MASK;
1066                                         if (!(algo_strength & SSL_STRONG_MASK)) { found = 0; break; }
1067                                         }
1068                                 else
1069                                         algo_strength |= ca_list[j]->algo_strength & SSL_STRONG_MASK;
1070                                 }
1071
1072                         if (ca_list[j]->valid)
1073                                 {
1074                                 /* explicit ciphersuite found; its protocol version
1075                                  * does not become part of the search pattern!*/
1076
1077                                 cipher_id = ca_list[j]->id;
1078                                 }
1079                         else
1080                                 {
1081                                 /* not an explicit ciphersuite; only in this case, the
1082                                  * protocol version is considered part of the search pattern */
1083
1084                                 if (ca_list[j]->algorithm_ssl)
1085                                         {
1086                                         if (alg_ssl)
1087                                                 {
1088                                                 alg_ssl &= ca_list[j]->algorithm_ssl;
1089                                                 if (!alg_ssl) { found = 0; break; }
1090                                                 }
1091                                         else
1092                                                 alg_ssl = ca_list[j]->algorithm_ssl;
1093                                         }
1094                                 }
1095
1096                         if (!multi) break;
1097                         }
1098
1099                 /*
1100                  * Ok, we have the rule, now apply it
1101                  */
1102                 if (rule == CIPHER_SPECIAL)
1103                         {       /* special command */
1104                         ok = 0;
1105                         if ((buflen == 8) &&
1106                                 !strncmp(buf, "STRENGTH", 8))
1107                                 ok = ssl_cipher_strength_sort(head_p, tail_p);
1108                         else
1109                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1110                                         SSL_R_INVALID_COMMAND);
1111                         if (ok == 0)
1112                                 retval = 0;
1113                         /*
1114                          * We do not support any "multi" options
1115                          * together with "@", so throw away the
1116                          * rest of the command, if any left, until
1117                          * end or ':' is found.
1118                          */
1119                         while ((*l != '\0') && !ITEM_SEP(*l))
1120                                 l++;
1121                         }
1122                 else if (found)
1123                         {
1124                         ssl_cipher_apply_rule(cipher_id,
1125                                 alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength,
1126                                 rule, -1, head_p, tail_p);
1127                         }
1128                 else
1129                         {
1130                         while ((*l != '\0') && !ITEM_SEP(*l))
1131                                 l++;
1132                         }
1133                 if (*l == '\0') break; /* done */
1134                 }
1135
1136         return(retval);
1137         }
1138
1139 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
1140                 STACK_OF(SSL_CIPHER) **cipher_list,
1141                 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
1142                 const char *rule_str)
1143         {
1144         int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
1145         unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl;
1146         STACK_OF(SSL_CIPHER) *cipherstack, *tmp_cipher_list;
1147         const char *rule_p;
1148         CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
1149         SSL_CIPHER **ca_list = NULL;
1150
1151         /*
1152          * Return with error if nothing to do.
1153          */
1154         if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == NULL)
1155                 return NULL;
1156
1157         /*
1158          * To reduce the work to do we only want to process the compiled
1159          * in algorithms, so we first get the mask of disabled ciphers.
1160          */
1161         ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl);
1162
1163         /*
1164          * Now we have to collect the available ciphers from the compiled
1165          * in ciphers. We cannot get more than the number compiled in, so
1166          * it is used for allocation.
1167          */
1168         num_of_ciphers = ssl_method->num_ciphers();
1169 #ifdef KSSL_DEBUG
1170         printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers);
1171 #endif    /* KSSL_DEBUG */
1172         co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
1173         if (co_list == NULL)
1174                 {
1175                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
1176                 return(NULL);   /* Failure */
1177                 }
1178
1179         ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers,
1180                                    disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl,
1181                                    co_list, &head, &tail);
1182
1183
1184         /* Now arrange all ciphers by preference: */
1185
1186         /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */
1187         ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1188         ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1189
1190         /* AES is our preferred symmetric cipher */
1191         ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1192
1193         /* Temporarily enable everything else for sorting */
1194         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1195
1196         /* Low priority for MD5 */
1197         ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail);
1198
1199         /* Move anonymous ciphers to the end.  Usually, these will remain disabled.
1200          * (For applications that allow them, they aren't too bad, but we prefer
1201          * authenticated ciphers.) */
1202         ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1203
1204         /* Move ciphers without forward secrecy to the end */
1205         ssl_cipher_apply_rule(0, 0, SSL_aECDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1206         /* ssl_cipher_apply_rule(0, 0, SSL_aDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); */
1207         ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1208         ssl_cipher_apply_rule(0, SSL_kPSK, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1209         ssl_cipher_apply_rule(0, SSL_kKRB5, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1210
1211         /* RC4 is sort-of broken -- move the the end */
1212         ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1213
1214         /* Now sort by symmetric encryption strength.  The above ordering remains
1215          * in force within each class */
1216         if (!ssl_cipher_strength_sort(&head, &tail))
1217                 {
1218                 OPENSSL_free(co_list);
1219                 return NULL;
1220                 }
1221
1222         /* Now disable everything (maintaining the ordering!) */
1223         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1224
1225
1226         /*
1227          * We also need cipher aliases for selecting based on the rule_str.
1228          * There might be two types of entries in the rule_str: 1) names
1229          * of ciphers themselves 2) aliases for groups of ciphers.
1230          * For 1) we need the available ciphers and for 2) the cipher
1231          * groups of cipher_aliases added together in one list (otherwise
1232          * we would be happy with just the cipher_aliases table).
1233          */
1234         num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
1235         num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
1236         ca_list =
1237                 (SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
1238         if (ca_list == NULL)
1239                 {
1240                 OPENSSL_free(co_list);
1241                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
1242                 return(NULL);   /* Failure */
1243                 }
1244         ssl_cipher_collect_aliases(ca_list, num_of_group_aliases,
1245                                    disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl,
1246                                    head);
1247
1248         /*
1249          * If the rule_string begins with DEFAULT, apply the default rule
1250          * before using the (possibly available) additional rules.
1251          */
1252         ok = 1;
1253         rule_p = rule_str;
1254         if (strncmp(rule_str,"DEFAULT",7) == 0)
1255                 {
1256                 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
1257                         &head, &tail, ca_list);
1258                 rule_p += 7;
1259                 if (*rule_p == ':')
1260                         rule_p++;
1261                 }
1262
1263         if (ok && (strlen(rule_p) > 0))
1264                 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list);
1265
1266         OPENSSL_free(ca_list);  /* Not needed anymore */
1267
1268         if (!ok)
1269                 {       /* Rule processing failure */
1270                 OPENSSL_free(co_list);
1271                 return(NULL);
1272                 }
1273
1274         /*
1275          * Allocate new "cipherstack" for the result, return with error
1276          * if we cannot get one.
1277          */
1278         if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
1279                 {
1280                 OPENSSL_free(co_list);
1281                 return(NULL);
1282                 }
1283
1284         /*
1285          * The cipher selection for the list is done. The ciphers are added
1286          * to the resulting precedence to the STACK_OF(SSL_CIPHER).
1287          */
1288         for (curr = head; curr != NULL; curr = curr->next)
1289                 {
1290                 if (curr->active)
1291                         {
1292                         sk_SSL_CIPHER_push(cipherstack, curr->cipher);
1293 #ifdef CIPHER_DEBUG
1294                         printf("<%s>\n",curr->cipher->name);
1295 #endif
1296                         }
1297                 }
1298         OPENSSL_free(co_list);  /* Not needed any longer */
1299
1300         tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack);
1301         if (tmp_cipher_list == NULL)
1302                 {
1303                 sk_SSL_CIPHER_free(cipherstack);
1304                 return NULL;
1305                 }
1306         if (*cipher_list != NULL)
1307                 sk_SSL_CIPHER_free(*cipher_list);
1308         *cipher_list = cipherstack;
1309         if (*cipher_list_by_id != NULL)
1310                 sk_SSL_CIPHER_free(*cipher_list_by_id);
1311         *cipher_list_by_id = tmp_cipher_list;
1312         sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
1313
1314         return(cipherstack);
1315         }
1316
1317 char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
1318         {
1319         int is_export,pkl,kl;
1320         const char *ver,*exp_str;
1321         const char *kx,*au,*enc,*mac;
1322         unsigned long alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl,alg2,alg_s;
1323 #ifdef KSSL_DEBUG
1324         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx/%lx/%lx/%lx/%lx\n";
1325 #else
1326         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
1327 #endif /* KSSL_DEBUG */
1328
1329         alg_mkey = cipher->algorithm_mkey;
1330         alg_auth = cipher->algorithm_auth;
1331         alg_enc = cipher->algorithm_enc;
1332         alg_mac = cipher->algorithm_mac;
1333         alg_ssl = cipher->algorithm_ssl;
1334
1335         alg_s=cipher->algo_strength;
1336         alg2=cipher->algorithm2;
1337
1338         is_export=SSL_C_IS_EXPORT(cipher);
1339         pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
1340         kl=SSL_C_EXPORT_KEYLENGTH(cipher);
1341         exp_str=is_export?" export":"";
1342
1343         if (alg_ssl & SSL_SSLV2)
1344                 ver="SSLv2";
1345         else if (alg_ssl & SSL_SSLV3)
1346                 ver="SSLv3";
1347         else
1348                 ver="unknown";
1349
1350         switch (alg_mkey)
1351                 {
1352         case SSL_kRSA:
1353                 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
1354                 break;
1355         case SSL_kDHr:
1356                 kx="DH/RSA";
1357                 break;
1358         case SSL_kDHd:
1359                 kx="DH/DSS";
1360                 break;
1361         case SSL_kKRB5:
1362                 kx="KRB5";
1363                 break;
1364         case SSL_kEDH:
1365                 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
1366                 break;
1367         case SSL_kECDHr:
1368                 kx="ECDH/RSA";
1369                 break;
1370         case SSL_kECDHe:
1371                 kx="ECDH/ECDSA";
1372                 break;
1373         case SSL_kEECDH:
1374                 kx="ECDH";
1375                 break;
1376         case SSL_kPSK:
1377                 kx="PSK";
1378                 break;
1379         default:
1380                 kx="unknown";
1381                 }
1382
1383         switch (alg_auth)
1384                 {
1385         case SSL_aRSA:
1386                 au="RSA";
1387                 break;
1388         case SSL_aDSS:
1389                 au="DSS";
1390                 break;
1391         case SSL_aDH:
1392                 au="DH";
1393                 break;
1394         case SSL_aKRB5:
1395                 au="KRB5";
1396                 break;
1397         case SSL_aECDH:
1398                 au="ECDH";
1399                 break;
1400         case SSL_aNULL:
1401                 au="None";
1402                 break;
1403         case SSL_aECDSA:
1404                 au="ECDSA";
1405                 break;
1406         case SSL_aPSK:
1407                 au="PSK";
1408                 break;
1409         default:
1410                 au="unknown";
1411                 break;
1412                 }
1413
1414         switch (alg_enc)
1415                 {
1416         case SSL_DES:
1417                 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
1418                 break;
1419         case SSL_3DES:
1420                 enc="3DES(168)";
1421                 break;
1422         case SSL_RC4:
1423                 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
1424                   :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
1425                 break;
1426         case SSL_RC2:
1427                 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
1428                 break;
1429         case SSL_IDEA:
1430                 enc="IDEA(128)";
1431                 break;
1432         case SSL_eNULL:
1433                 enc="None";
1434                 break;
1435         case SSL_AES128:
1436                 enc="AES(128)";
1437                 break;
1438         case SSL_AES256:
1439                 enc="AES(256)";
1440                 break;
1441         case SSL_CAMELLIA128:
1442                 enc="Camellia(128)";
1443                 break;
1444         case SSL_CAMELLIA256:
1445                 enc="Camellia(256)";
1446                 break;
1447         default:
1448                 enc="unknown";
1449                 break;
1450                 }
1451
1452         switch (alg_mac)
1453                 {
1454         case SSL_MD5:
1455                 mac="MD5";
1456                 break;
1457         case SSL_SHA1:
1458                 mac="SHA1";
1459                 break;
1460         default:
1461                 mac="unknown";
1462                 break;
1463                 }
1464
1465         if (buf == NULL)
1466                 {
1467                 len=128;
1468                 buf=OPENSSL_malloc(len);
1469                 if (buf == NULL) return("OPENSSL_malloc Error");
1470                 }
1471         else if (len < 128)
1472                 return("Buffer too small");
1473
1474 #ifdef KSSL_DEBUG
1475         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl);
1476 #else
1477         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str);
1478 #endif /* KSSL_DEBUG */
1479         return(buf);
1480         }
1481
1482 char *SSL_CIPHER_get_version(const SSL_CIPHER *c)
1483         {
1484         int i;
1485
1486         if (c == NULL) return("(NONE)");
1487         i=(int)(c->id>>24L);
1488         if (i == 3)
1489                 return("TLSv1/SSLv3");
1490         else if (i == 2)
1491                 return("SSLv2");
1492         else
1493                 return("unknown");
1494         }
1495
1496 /* return the actual cipher being used */
1497 const char *SSL_CIPHER_get_name(const SSL_CIPHER *c)
1498         {
1499         if (c != NULL)
1500                 return(c->name);
1501         return("(NONE)");
1502         }
1503
1504 /* number of bits for symmetric cipher */
1505 int SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
1506         {
1507         int ret=0;
1508
1509         if (c != NULL)
1510                 {
1511                 if (alg_bits != NULL) *alg_bits = c->alg_bits;
1512                 ret = c->strength_bits;
1513                 }
1514         return(ret);
1515         }
1516
1517 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
1518         {
1519         SSL_COMP *ctmp;
1520         int i,nn;
1521
1522         if ((n == 0) || (sk == NULL)) return(NULL);
1523         nn=sk_SSL_COMP_num(sk);
1524         for (i=0; i<nn; i++)
1525                 {
1526                 ctmp=sk_SSL_COMP_value(sk,i);
1527                 if (ctmp->id == n)
1528                         return(ctmp);
1529                 }
1530         return(NULL);
1531         }
1532
1533 #ifdef OPENSSL_NO_COMP
1534 void *SSL_COMP_get_compression_methods(void)
1535         {
1536         return NULL;
1537         }
1538 int SSL_COMP_add_compression_method(int id, void *cm)
1539         {
1540         return 1;
1541         }
1542
1543 const char *SSL_COMP_get_name(const void *comp)
1544         {
1545         return NULL;
1546         }
1547 #else
1548 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
1549         {
1550         load_builtin_compressions();
1551         return(ssl_comp_methods);
1552         }
1553
1554 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
1555         {
1556         SSL_COMP *comp;
1557
1558         if (cm == NULL || cm->type == NID_undef)
1559                 return 1;
1560
1561         /* According to draft-ietf-tls-compression-04.txt, the
1562            compression number ranges should be the following:
1563
1564            0 to 63:    methods defined by the IETF
1565            64 to 192:  external party methods assigned by IANA
1566            193 to 255: reserved for private use */
1567         if (id < 193 || id > 255)
1568                 {
1569                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_COMPRESSION_ID_NOT_WITHIN_PRIVATE_RANGE);
1570                 return 0;
1571                 }
1572
1573         MemCheck_off();
1574         comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
1575         comp->id=id;
1576         comp->method=cm;
1577         load_builtin_compressions();
1578         if (ssl_comp_methods
1579                 && !sk_SSL_COMP_find(ssl_comp_methods,comp))
1580                 {
1581                 OPENSSL_free(comp);
1582                 MemCheck_on();
1583                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_DUPLICATE_COMPRESSION_ID);
1584                 return(1);
1585                 }
1586         else if ((ssl_comp_methods == NULL)
1587                 || !sk_SSL_COMP_push(ssl_comp_methods,comp))
1588                 {
1589                 OPENSSL_free(comp);
1590                 MemCheck_on();
1591                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
1592                 return(1);
1593                 }
1594         else
1595                 {
1596                 MemCheck_on();
1597                 return(0);
1598                 }
1599         }
1600
1601 const char *SSL_COMP_get_name(const COMP_METHOD *comp)
1602         {
1603         if (comp)
1604                 return comp->name;
1605         return NULL;
1606         }
1607
1608 #endif