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_SEED_IDX        11
 160 #define SSL_ENC_NUM_IDX         12
 161
 162
 163 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
 164         NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
 165         };
 166
 167 #define SSL_COMP_NULL_IDX       0
 168 #define SSL_COMP_ZLIB_IDX       1
 169 #define SSL_COMP_NUM_IDX        2
 170
 171 static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
 172
 173 #define SSL_MD_MD5_IDX  0
 174 #define SSL_MD_SHA1_IDX 1
 175 #define SSL_MD_NUM_IDX  2
 176 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
 177         NULL,NULL,
 178         };
 179
 180 #define CIPHER_ADD      1
 181 #define CIPHER_KILL     2
 182 #define CIPHER_DEL      3
 183 #define CIPHER_ORD      4
 184 #define CIPHER_SPECIAL  5
 185
 186 typedef struct cipher_order_st
 187         {
 188         SSL_CIPHER *cipher;
 189         int active;
 190         int dead;
 191         struct cipher_order_st *next,*prev;
 192         } CIPHER_ORDER;
 193
 194 static const SSL_CIPHER cipher_aliases[]={
 195         /* "ALL" doesn't include eNULL (must be specifically enabled) */
 196         {0,SSL_TXT_ALL,0,     0,0,~SSL_eNULL,0,0,0,0,0,0},
 197         /* "COMPLEMENTOFALL" */
 198         {0,SSL_TXT_CMPALL,0,  0,0,SSL_eNULL,0,0,0,0,0,0},
 199
 200         /* "COMPLEMENTOFDEFAULT" (does *not* include ciphersuites not found in ALL!) */
 201         {0,SSL_TXT_CMPDEF,0,  SSL_kEDH|SSL_kEECDH,SSL_aNULL,~SSL_eNULL,0,0,0,0,0,0},
 202
 203         /* key exchange aliases
 204          * (some of those using only a single bit here combine
 205          * multiple key exchange algs according to the RFCs,
 206          * e.g. kEDH combines DHE_DSS and DHE_RSA) */
 207         {0,SSL_TXT_kRSA,0,    SSL_kRSA,  0,0,0,0,0,0,0,0},
 208
 209         {0,SSL_TXT_kDHr,0,    SSL_kDHr,  0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 210         {0,SSL_TXT_kDHd,0,    SSL_kDHd,  0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 211         {0,SSL_TXT_kDH,0,     SSL_kDHr|SSL_kDHd,0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 212         {0,SSL_TXT_kEDH,0,    SSL_kEDH,  0,0,0,0,0,0,0,0},
 213         {0,SSL_TXT_DH,0,      SSL_kDHr|SSL_kDHd|SSL_kEDH,0,0,0,0,0,0,0,0},
 214
 215         {0,SSL_TXT_kKRB5,0,   SSL_kKRB5, 0,0,0,0,0,0,0,0},
 216
 217         {0,SSL_TXT_kECDHr,0,  SSL_kECDHr,0,0,0,0,0,0,0,0},
 218         {0,SSL_TXT_kECDHe,0,  SSL_kECDHe,0,0,0,0,0,0,0,0},
 219         {0,SSL_TXT_kECDH,0,   SSL_kECDHr|SSL_kECDHe,0,0,0,0,0,0,0,0},
 220         {0,SSL_TXT_kEECDH,0,  SSL_kEECDH,0,0,0,0,0,0,0,0},
 221         {0,SSL_TXT_ECDH,0,    SSL_kECDHr|SSL_kECDHe|SSL_kEECDH,0,0,0,0,0,0,0,0},
 222
 223         {0,SSL_TXT_kPSK,0,    SSL_kPSK,  0,0,0,0,0,0,0,0},
 224
 225
 226         /* server authentication aliases */
 227         {0,SSL_TXT_aRSA,0,    0,SSL_aRSA,  0,0,0,0,0,0,0},
 228         {0,SSL_TXT_aDSS,0,    0,SSL_aDSS,  0,0,0,0,0,0,0},
 229         {0,SSL_TXT_DSS,0,     0,SSL_aDSS,   0,0,0,0,0,0,0},
 230         {0,SSL_TXT_aKRB5,0,   0,SSL_aKRB5, 0,0,0,0,0,0,0},
 231         {0,SSL_TXT_aNULL,0,   0,SSL_aNULL, 0,0,0,0,0,0,0},
 232         {0,SSL_TXT_aDH,0,     0,SSL_aDH,   0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 233         {0,SSL_TXT_aECDH,0,   0,SSL_aECDH, 0,0,0,0,0,0,0},
 234         {0,SSL_TXT_aECDSA,0,  0,SSL_aECDSA,0,0,0,0,0,0,0},
 235         {0,SSL_TXT_ECDSA,0,   0,SSL_aECDSA, 0,0,0,0,0,0,0},
 236         {0,SSL_TXT_aPSK,0,    0,SSL_aPSK,  0,0,0,0,0,0,0},
 237
 238
 239         /* aliases combining key exchange and server authentication */
 240         {0,SSL_TXT_EDH,0,     SSL_kEDH,~SSL_aNULL,0,0,0,0,0,0,0},
 241         {0,SSL_TXT_EECDH,0,   SSL_kEECDH,~SSL_aNULL,0,0,0,0,0,0,0},
 242         {0,SSL_TXT_NULL,0,    0,0,SSL_eNULL, 0,0,0,0,0,0},
 243         {0,SSL_TXT_KRB5,0,    SSL_kKRB5,SSL_aKRB5,0,0,0,0,0,0,0},
 244         {0,SSL_TXT_RSA,0,     SSL_kRSA,SSL_aRSA,0,0,0,0,0,0,0},
 245         {0,SSL_TXT_ADH,0,     SSL_kEDH,SSL_aNULL,0,0,0,0,0,0,0},
 246         {0,SSL_TXT_AECDH,0,   SSL_kEECDH,SSL_aNULL,0,0,0,0,0,0,0},
 247         {0,SSL_TXT_PSK,0,     SSL_kPSK,SSL_aPSK,0,0,0,0,0,0,0},
 248
 249
 250         /* symmetric encryption aliases */
 251         {0,SSL_TXT_DES,0,     0,0,SSL_DES,   0,0,0,0,0,0},
 252         {0,SSL_TXT_3DES,0,    0,0,SSL_3DES,  0,0,0,0,0,0},
 253         {0,SSL_TXT_RC4,0,     0,0,SSL_RC4,   0,0,0,0,0,0},
 254         {0,SSL_TXT_RC2,0,     0,0,SSL_RC2,   0,0,0,0,0,0},
 255         {0,SSL_TXT_IDEA,0,    0,0,SSL_IDEA,  0,0,0,0,0,0},
 256         {0,SSL_TXT_SEED,0,    0,0,SSL_SEED,  0,0,0,0,0,0},
 257         {0,SSL_TXT_eNULL,0,   0,0,SSL_eNULL, 0,0,0,0,0,0},
 258         {0,SSL_TXT_AES128,0,  0,0,SSL_AES128,0,0,0,0,0,0},
 259         {0,SSL_TXT_AES256,0,  0,0,SSL_AES256,0,0,0,0,0,0},
 260         {0,SSL_TXT_AES,0,     0,0,SSL_AES128|SSL_AES256,0,0,0,0,0,0},
 261         {0,SSL_TXT_CAMELLIA128,0,0,0,SSL_CAMELLIA128,0,0,0,0,0,0},
 262         {0,SSL_TXT_CAMELLIA256,0,0,0,SSL_CAMELLIA256,0,0,0,0,0,0},
 263         {0,SSL_TXT_CAMELLIA   ,0,0,0,SSL_CAMELLIA128|SSL_CAMELLIA256,0,0,0,0,0,0},
 264
 265         /* MAC aliases */
 266         {0,SSL_TXT_MD5,0,     0,0,0,SSL_MD5,   0,0,0,0,0},
 267         {0,SSL_TXT_SHA1,0,    0,0,0,SSL_SHA1,  0,0,0,0,0},
 268         {0,SSL_TXT_SHA,0,     0,0,0,SSL_SHA1,  0,0,0,0,0},
 269
 270         /* protocol version aliases */
 271         {0,SSL_TXT_SSLV2,0,   0,0,0,0,SSL_SSLV2, 0,0,0,0},
 272         {0,SSL_TXT_SSLV3,0,   0,0,0,0,SSL_SSLV3, 0,0,0,0},
 273         {0,SSL_TXT_TLSV1,0,   0,0,0,0,SSL_TLSV1, 0,0,0,0},
 274
 275         /* export flag */
 276         {0,SSL_TXT_EXP,0,     0,0,0,0,0,SSL_EXPORT,0,0,0},
 277         {0,SSL_TXT_EXPORT,0,  0,0,0,0,0,SSL_EXPORT,0,0,0},
 278
 279         /* strength classes */
 280         {0,SSL_TXT_EXP40,0,   0,0,0,0,0,SSL_EXP40, 0,0,0},
 281         {0,SSL_TXT_EXP56,0,   0,0,0,0,0,SSL_EXP56, 0,0,0},
 282         {0,SSL_TXT_LOW,0,     0,0,0,0,0,SSL_LOW,   0,0,0},
 283         {0,SSL_TXT_MEDIUM,0,  0,0,0,0,0,SSL_MEDIUM,0,0,0},
 284         {0,SSL_TXT_HIGH,0,    0,0,0,0,0,SSL_HIGH,  0,0,0},
 285         };
 286
 287 void ssl_load_ciphers(void)
 288         {
 289         ssl_cipher_methods[SSL_ENC_DES_IDX]=
 290                 EVP_get_cipherbyname(SN_des_cbc);
 291         ssl_cipher_methods[SSL_ENC_3DES_IDX]=
 292                 EVP_get_cipherbyname(SN_des_ede3_cbc);
 293         ssl_cipher_methods[SSL_ENC_RC4_IDX]=
 294                 EVP_get_cipherbyname(SN_rc4);
 295         ssl_cipher_methods[SSL_ENC_RC2_IDX]=
 296                 EVP_get_cipherbyname(SN_rc2_cbc);
 297 #ifndef OPENSSL_NO_IDEA
 298         ssl_cipher_methods[SSL_ENC_IDEA_IDX]=
 299                 EVP_get_cipherbyname(SN_idea_cbc);
 300 #else
 301         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= NULL;
 302 #endif
 303         ssl_cipher_methods[SSL_ENC_AES128_IDX]=
 304           EVP_get_cipherbyname(SN_aes_128_cbc);
 305         ssl_cipher_methods[SSL_ENC_AES256_IDX]=
 306           EVP_get_cipherbyname(SN_aes_256_cbc);
 307         ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX]=
 308           EVP_get_cipherbyname(SN_camellia_128_cbc);
 309         ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX]=
 310           EVP_get_cipherbyname(SN_camellia_256_cbc);
 311         ssl_cipher_methods[SSL_ENC_GOST89_IDX]=
 312           EVP_get_cipherbyname(SN_gost89_cnt);
 313         ssl_cipher_methods[SSL_ENC_SEED_IDX]=
 314           EVP_get_cipherbyname(SN_seed_cbc);
 315
 316         ssl_digest_methods[SSL_MD_MD5_IDX]=
 317                 EVP_get_digestbyname(SN_md5);
 318         ssl_digest_methods[SSL_MD_SHA1_IDX]=
 319                 EVP_get_digestbyname(SN_sha1);
 320         }
 321
 322
 323 #ifndef OPENSSL_NO_COMP
 324
 325 static int sk_comp_cmp(const SSL_COMP * const *a,
 326                         const SSL_COMP * const *b)
 327         {
 328         return((*a)->id-(*b)->id);
 329         }
 330
 331 static void load_builtin_compressions(void)
 332         {
 333         int got_write_lock = 0;
 334
 335         CRYPTO_r_lock(CRYPTO_LOCK_SSL);
 336         if (ssl_comp_methods == NULL)
 337                 {
 338                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
 339                 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
 340                 got_write_lock = 1;
 341
 342                 if (ssl_comp_methods == NULL)
 343                         {
 344                         SSL_COMP *comp = NULL;
 345
 346                         MemCheck_off();
 347                         ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
 348                         if (ssl_comp_methods != NULL)
 349                                 {
 350                                 comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
 351                                 if (comp != NULL)
 352                                         {
 353                                         comp->method=COMP_zlib();
 354                                         if (comp->method
 355                                                 && comp->method->type == NID_undef)
 356                                                 OPENSSL_free(comp);
 357                                         else
 358                                                 {
 359                                                 comp->id=SSL_COMP_ZLIB_IDX;
 360                                                 comp->name=comp->method->name;
 361                                                 sk_SSL_COMP_push(ssl_comp_methods,comp);
 362                                                 }
 363                                         }
 364                                 }
 365                         MemCheck_on();
 366                         }
 367                 }
 368
 369         if (got_write_lock)
 370                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
 371         else
 372                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
 373         }
 374 #endif
 375
 376 int ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc,
 377              const EVP_MD **md, SSL_COMP **comp)
 378         {
 379         int i;
 380         SSL_CIPHER *c;
 381
 382         c=s->cipher;
 383         if (c == NULL) return(0);
 384         if (comp != NULL)
 385                 {
 386                 SSL_COMP ctmp;
 387 #ifndef OPENSSL_NO_COMP
 388                 load_builtin_compressions();
 389 #endif
 390
 391                 *comp=NULL;
 392                 ctmp.id=s->compress_meth;
 393                 if (ssl_comp_methods != NULL)
 394                         {
 395                         i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
 396                         if (i >= 0)
 397                                 *comp=sk_SSL_COMP_value(ssl_comp_methods,i);
 398                         else
 399                                 *comp=NULL;
 400                         }
 401                 }
 402
 403         if ((enc == NULL) || (md == NULL)) return(0);
 404
 405         switch (c->algorithm_enc)
 406                 {
 407         case SSL_DES:
 408                 i=SSL_ENC_DES_IDX;
 409                 break;
 410         case SSL_3DES:
 411                 i=SSL_ENC_3DES_IDX;
 412                 break;
 413         case SSL_RC4:
 414                 i=SSL_ENC_RC4_IDX;
 415                 break;
 416         case SSL_RC2:
 417                 i=SSL_ENC_RC2_IDX;
 418                 break;
 419         case SSL_IDEA:
 420                 i=SSL_ENC_IDEA_IDX;
 421                 break;
 422         case SSL_eNULL:
 423                 i=SSL_ENC_NULL_IDX;
 424                 break;
 425         case SSL_AES128:
 426                 i=SSL_ENC_AES128_IDX;
 427                 break;
 428         case SSL_AES256:
 429                 i=SSL_ENC_AES256_IDX;
 430                 break;
 431         case SSL_CAMELLIA128:
 432                 i=SSL_ENC_CAMELLIA128_IDX;
 433                 break;
 434         case SSL_CAMELLIA256:
 435                 i=SSL_ENC_CAMELLIA256_IDX;
 436                 break;
 437         case SSL_eGOST2814789CNT:
 438                 i=SSL_ENC_GOST89_IDX;
 439                 break;
 440         case SSL_SEED:
 441                 i=SSL_ENC_SEED_IDX;
 442                 break;
 443         default:
 444                 i= -1;
 445                 break;
 446                 }
 447
 448         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
 449                 *enc=NULL;
 450         else
 451                 {
 452                 if (i == SSL_ENC_NULL_IDX)
 453                         *enc=EVP_enc_null();
 454                 else
 455                         *enc=ssl_cipher_methods[i];
 456                 }
 457
 458         switch (c->algorithm_mac)
 459                 {
 460         case SSL_MD5:
 461                 i=SSL_MD_MD5_IDX;
 462                 break;
 463         case SSL_SHA1:
 464                 i=SSL_MD_SHA1_IDX;
 465                 break;
 466         default:
 467                 i= -1;
 468                 break;
 469                 }
 470         if ((i < 0) || (i > SSL_MD_NUM_IDX))
 471                 *md=NULL;
 472         else
 473                 *md=ssl_digest_methods[i];
 474
 475         if ((*enc != NULL) && (*md != NULL))
 476                 return(1);
 477         else
 478                 return(0);
 479         }
 480
 481 #define ITEM_SEP(a) \
 482         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
 483
 484 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
 485              CIPHER_ORDER **tail)
 486         {
 487         if (curr == *tail) return;
 488         if (curr == *head)
 489                 *head=curr->next;
 490         if (curr->prev != NULL)
 491                 curr->prev->next=curr->next;
 492         if (curr->next != NULL)
 493                 curr->next->prev=curr->prev;
 494         (*tail)->next=curr;
 495         curr->prev= *tail;
 496         curr->next=NULL;
 497         *tail=curr;
 498         }
 499
 500 static void ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr,
 501              CIPHER_ORDER **tail)
 502         {
 503         if (curr == *head) return;
 504         if (curr == *tail)
 505                 *tail=curr->prev;
 506         if (curr->next != NULL)
 507                 curr->next->prev=curr->prev;
 508         if (curr->prev != NULL)
 509                 curr->prev->next=curr->next;
 510         (*head)->prev=curr;
 511         curr->next= *head;
 512         curr->prev=NULL;
 513         *head=curr;
 514         }
 515
 516 static void ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth, unsigned long *enc, unsigned long *mac, unsigned long *ssl)
 517         {
 518         *mkey = 0;
 519         *auth = 0;
 520         *enc = 0;
 521         *mac = 0;
 522         *ssl = 0;
 523
 524 #ifdef OPENSSL_NO_RSA
 525         *mkey |= SSL_kRSA;
 526         *auth |= SSL_aRSA;
 527 #endif
 528 #ifdef OPENSSL_NO_DSA
 529         *auth |= SSL_aDSS;
 530 #endif
 531         *mkey |= SSL_kDHr|SSL_kDHd; /* no such ciphersuites supported! */
 532         *auth |= SSL_aDH;
 533 #ifdef OPENSSL_NO_DH
 534         *mkey |= SSL_kDHr|SSL_kDHd|SSL_kEDH;
 535         *auth |= SSL_aDH;
 536 #endif
 537 #ifdef OPENSSL_NO_KRB5
 538         *mkey |= SSL_kKRB5;
 539         *auth |= SSL_aKRB5;
 540 #endif
 541 #ifdef OPENSSL_NO_ECDSA
 542         *auth |= SSL_aECDSA;
 543 #endif
 544 #ifdef OPENSSL_NO_ECDH
 545         *mkey |= SSL_kECDHe|SSL_kECDHr;
 546         *auth |= SSL_aECDH;
 547 #endif
 548 #ifdef OPENSSL_NO_PSK
 549         *mkey |= SSL_kPSK;
 550         *auth |= SSL_aPSK;
 551 #endif
 552 #ifdef SSL_FORBID_ENULL
 553         *enc |= SSL_eNULL;
 554 #endif
 555
 556         *enc |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
 557         *enc |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
 558         *enc |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
 559         *enc |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
 560         *enc |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
 561         *enc |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES128:0;
 562         *enc |= (ssl_cipher_methods[SSL_ENC_AES256_IDX] == NULL) ? SSL_AES256:0;
 563         *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] == NULL) ? SSL_CAMELLIA128:0;
 564         *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] == NULL) ? SSL_CAMELLIA256:0;
 565         *enc |= (ssl_cipher_methods[SSL_ENC_GOST89_IDX] == NULL) ? SSL_eGOST2814789CNT:0;
 566         *enc |= (ssl_cipher_methods[SSL_ENC_SEED_IDX] == NULL) ? SSL_SEED:0;
 567
 568         *mac |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
 569         *mac |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
 570         }
 571
 572 static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
 573                 int num_of_ciphers,
 574                 unsigned long disabled_mkey, unsigned long disabled_auth,
 575                 unsigned long disabled_enc, unsigned long disabled_mac,
 576                 unsigned long disabled_ssl,
 577                 CIPHER_ORDER *co_list,
 578                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
 579         {
 580         int i, co_list_num;
 581         SSL_CIPHER *c;
 582
 583         /*
 584          * We have num_of_ciphers descriptions compiled in, depending on the
 585          * method selected (SSLv2 and/or SSLv3, TLSv1 etc).
 586          * These will later be sorted in a linked list with at most num
 587          * entries.
 588          */
 589
 590         /* Get the initial list of ciphers */
 591         co_list_num = 0;        /* actual count of ciphers */
 592         for (i = 0; i < num_of_ciphers; i++)
 593                 {
 594                 c = ssl_method->get_cipher(i);
 595                 /* drop those that use any of that is not available */
 596                 if ((c != NULL) && c->valid &&
 597                     !(c->algorithm_mkey & disabled_mkey) &&
 598                     !(c->algorithm_auth & disabled_auth) &&
 599                     !(c->algorithm_enc & disabled_enc) &&
 600                     !(c->algorithm_mac & disabled_mac) &&
 601                     !(c->algorithm_ssl & disabled_ssl))
 602                         {
 603                         co_list[co_list_num].cipher = c;
 604                         co_list[co_list_num].next = NULL;
 605                         co_list[co_list_num].prev = NULL;
 606                         co_list[co_list_num].active = 0;
 607                         co_list_num++;
 608 #ifdef KSSL_DEBUG
 609                         printf("\t%d: %s %lx %lx %lx\n",i,c->name,c->id,c->algorithm_mkey,c->algorithm_auth);
 610 #endif  /* KSSL_DEBUG */
 611                         /*
 612                         if (!sk_push(ca_list,(char *)c)) goto err;
 613                         */
 614                         }
 615                 }
 616
 617         /*
 618          * Prepare linked list from list entries
 619          */
 620         if (co_list_num > 0)
 621                 {
 622                 co_list[0].prev = NULL;
 623
 624                 if (co_list_num > 1)
 625                         {
 626                         co_list[0].next = &co_list[1];
 627
 628                         for (i = 1; i < co_list_num - 1; i++)
 629                                 {
 630                                 co_list[i].prev = &co_list[i - 1];
 631                                 co_list[i].next = &co_list[i + 1];
 632                                 }
 633
 634                         co_list[co_list_num - 1].prev = &co_list[co_list_num - 2];
 635                         }
 636
 637                 co_list[co_list_num - 1].next = NULL;
 638
 639                 *head_p = &co_list[0];
 640                 *tail_p = &co_list[co_list_num - 1];
 641                 }
 642         }
 643
 644 static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list,
 645                         int num_of_group_aliases,
 646                         unsigned long disabled_mkey, unsigned long disabled_auth,
 647                         unsigned long disabled_enc, unsigned long disabled_mac,
 648                         unsigned long disabled_ssl,
 649                         CIPHER_ORDER *head)
 650         {
 651         CIPHER_ORDER *ciph_curr;
 652         SSL_CIPHER **ca_curr;
 653         int i;
 654         unsigned long mask_mkey = ~disabled_mkey;
 655         unsigned long mask_auth = ~disabled_auth;
 656         unsigned long mask_enc = ~disabled_enc;
 657         unsigned long mask_mac = ~disabled_mac;
 658         unsigned long mask_ssl = ~disabled_ssl;
 659
 660         /*
 661          * First, add the real ciphers as already collected
 662          */
 663         ciph_curr = head;
 664         ca_curr = ca_list;
 665         while (ciph_curr != NULL)
 666                 {
 667                 *ca_curr = ciph_curr->cipher;
 668                 ca_curr++;
 669                 ciph_curr = ciph_curr->next;
 670                 }
 671
 672         /*
 673          * Now we add the available ones from the cipher_aliases[] table.
 674          * They represent either one or more algorithms, some of which
 675          * in any affected category must be supported (set in enabled_mask),
 676          * or represent a cipher strength value (will be added in any case because algorithms=0).
 677          */
 678         for (i = 0; i < num_of_group_aliases; i++)
 679                 {
 680                 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey;
 681                 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth;
 682                 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc;
 683                 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac;
 684                 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl;
 685
 686                 if (algorithm_mkey)
 687                         if ((algorithm_mkey & mask_mkey) == 0)
 688                                 continue;
 689
 690                 if (algorithm_auth)
 691                         if ((algorithm_auth & mask_auth) == 0)
 692                                 continue;
 693
 694                 if (algorithm_enc)
 695                         if ((algorithm_enc & mask_enc) == 0)
 696                                 continue;
 697
 698                 if (algorithm_mac)
 699                         if ((algorithm_mac & mask_mac) == 0)
 700                                 continue;
 701
 702                 if (algorithm_ssl)
 703                         if ((algorithm_ssl & mask_ssl) == 0)
 704                                 continue;
 705
 706                 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
 707                 ca_curr++;
 708                 }
 709
 710         *ca_curr = NULL;        /* end of list */
 711         }
 712
 713 static void ssl_cipher_apply_rule(unsigned long cipher_id,
 714                 unsigned long alg_mkey, unsigned long alg_auth,
 715                 unsigned long alg_enc, unsigned long alg_mac,
 716                 unsigned long alg_ssl,
 717                 unsigned long algo_strength,
 718                 int rule, int strength_bits,
 719                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
 720         {
 721         CIPHER_ORDER *head, *tail, *curr, *curr2, *last;
 722         SSL_CIPHER *cp;
 723         int reverse = 0;
 724
 725 #ifdef CIPHER_DEBUG
 726         printf("Applying rule %d with %08lx/%08lx/%08lx/%08lx/%08lx %08lx (%d)\n",
 727                 rule, alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength, strength_bits);
 728 #endif
 729
 730         if (rule == CIPHER_DEL)
 731                 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */
 732
 733         head = *head_p;
 734         tail = *tail_p;
 735
 736         if (reverse)
 737                 {
 738                 curr = tail;
 739                 last = head;
 740                 }
 741         else
 742                 {
 743                 curr = head;
 744                 last = tail;
 745                 }
 746
 747         curr2 = curr;
 748         for (;;)
 749                 {
 750                 if ((curr == NULL) || (curr == last)) break;
 751                 curr = curr2;
 752                 curr2 = reverse ? curr->prev : curr->next;
 753
 754                 cp = curr->cipher;
 755
 756                 /*
 757                  * Selection criteria is either the value of strength_bits
 758                  * or the algorithms used.
 759                  */
 760                 if (strength_bits >= 0)
 761                         {
 762                         if (strength_bits != cp->strength_bits)
 763                                 continue;
 764                         }
 765                 else
 766                         {
 767 #ifdef CIPHER_DEBUG
 768                         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);
 769 #endif
 770
 771                         if (alg_mkey && !(alg_mkey & cp->algorithm_mkey))
 772                                 continue;
 773                         if (alg_auth && !(alg_auth & cp->algorithm_auth))
 774                                 continue;
 775                         if (alg_enc && !(alg_enc & cp->algorithm_enc))
 776                                 continue;
 777                         if (alg_mac && !(alg_mac & cp->algorithm_mac))
 778                                 continue;
 779                         if (alg_ssl && !(alg_ssl & cp->algorithm_ssl))
 780                                 continue;
 781                         if ((algo_strength & SSL_EXP_MASK) && !(algo_strength & SSL_EXP_MASK & cp->algo_strength))
 782                                 continue;
 783                         if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
 784                                 continue;
 785                         }
 786
 787 #ifdef CIPHER_DEBUG
 788                 printf("Action = %d\n", rule);
 789 #endif
 790
 791                 /* add the cipher if it has not been added yet. */
 792                 if (rule == CIPHER_ADD)
 793                         {
 794                         /* reverse == 0 */
 795                         if (!curr->active)
 796                                 {
 797                                 ll_append_tail(&head, curr, &tail);
 798                                 curr->active = 1;
 799                                 }
 800                         }
 801                 /* Move the added cipher to this location */
 802                 else if (rule == CIPHER_ORD)
 803                         {
 804                         /* reverse == 0 */
 805                         if (curr->active)
 806                                 {
 807                                 ll_append_tail(&head, curr, &tail);
 808                                 }
 809                         }
 810                 else if (rule == CIPHER_DEL)
 811                         {
 812                         /* reverse == 1 */
 813                         if (curr->active)
 814                                 {
 815                                 /* most recently deleted ciphersuites get best positions
 816                                  * for any future CIPHER_ADD (note that the CIPHER_DEL loop
 817                                  * works in reverse to maintain the order) */
 818                                 ll_append_head(&head, curr, &tail);
 819                                 curr->active = 0;
 820                                 }
 821                         }
 822                 else if (rule == CIPHER_KILL)
 823                         {
 824                         /* reverse == 0 */
 825                         if (head == curr)
 826                                 head = curr->next;
 827                         else
 828                                 curr->prev->next = curr->next;
 829                         if (tail == curr)
 830                                 tail = curr->prev;
 831                         curr->active = 0;
 832                         if (curr->next != NULL)
 833                                 curr->next->prev = curr->prev;
 834                         if (curr->prev != NULL)
 835                                 curr->prev->next = curr->next;
 836                         curr->next = NULL;
 837                         curr->prev = NULL;
 838                         }
 839                 }
 840
 841         *head_p = head;
 842         *tail_p = tail;
 843         }
 844
 845 static int ssl_cipher_strength_sort(CIPHER_ORDER **head_p,
 846                                     CIPHER_ORDER **tail_p)
 847         {
 848         int max_strength_bits, i, *number_uses;
 849         CIPHER_ORDER *curr;
 850
 851         /*
 852          * This routine sorts the ciphers with descending strength. The sorting
 853          * must keep the pre-sorted sequence, so we apply the normal sorting
 854          * routine as '+' movement to the end of the list.
 855          */
 856         max_strength_bits = 0;
 857         curr = *head_p;
 858         while (curr != NULL)
 859                 {
 860                 if (curr->active &&
 861                     (curr->cipher->strength_bits > max_strength_bits))
 862                     max_strength_bits = curr->cipher->strength_bits;
 863                 curr = curr->next;
 864                 }
 865
 866         number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
 867         if (!number_uses)
 868                 {
 869                 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
 870                 return(0);
 871                 }
 872         memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
 873
 874         /*
 875          * Now find the strength_bits values actually used
 876          */
 877         curr = *head_p;
 878         while (curr != NULL)
 879                 {
 880                 if (curr->active)
 881                         number_uses[curr->cipher->strength_bits]++;
 882                 curr = curr->next;
 883                 }
 884         /*
 885          * Go through the list of used strength_bits values in descending
 886          * order.
 887          */
 888         for (i = max_strength_bits; i >= 0; i--)
 889                 if (number_uses[i] > 0)
 890                         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p);
 891
 892         OPENSSL_free(number_uses);
 893         return(1);
 894         }
 895
 896 static int ssl_cipher_process_rulestr(const char *rule_str,
 897                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p,
 898                 SSL_CIPHER **ca_list)
 899         {
 900         unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength;
 901         const char *l, *start, *buf;
 902         int j, multi, found, rule, retval, ok, buflen;
 903         unsigned long cipher_id = 0;
 904         char ch;
 905
 906         retval = 1;
 907         l = rule_str;
 908         for (;;)
 909                 {
 910                 ch = *l;
 911
 912                 if (ch == '\0')
 913                         break;          /* done */
 914                 if (ch == '-')
 915                         { rule = CIPHER_DEL; l++; }
 916                 else if (ch == '+')
 917                         { rule = CIPHER_ORD; l++; }
 918                 else if (ch == '!')
 919                         { rule = CIPHER_KILL; l++; }
 920                 else if (ch == '@')
 921                         { rule = CIPHER_SPECIAL; l++; }
 922                 else
 923                         { rule = CIPHER_ADD; }
 924
 925                 if (ITEM_SEP(ch))
 926                         {
 927                         l++;
 928                         continue;
 929                         }
 930
 931                 alg_mkey = 0;
 932                 alg_auth = 0;
 933                 alg_enc = 0;
 934                 alg_mac = 0;
 935                 alg_ssl = 0;
 936                 algo_strength = 0;
 937
 938                 start=l;
 939                 for (;;)
 940                         {
 941                         ch = *l;
 942                         buf = l;
 943                         buflen = 0;
 944 #ifndef CHARSET_EBCDIC
 945                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
 946                                 ((ch >= '0') && (ch <= '9')) ||
 947                                 ((ch >= 'a') && (ch <= 'z')) ||
 948                                  (ch == '-'))
 949 #else
 950                         while ( isalnum(ch) || (ch == '-'))
 951 #endif
 952                                  {
 953                                  ch = *(++l);
 954                                  buflen++;
 955                                  }
 956
 957                         if (buflen == 0)
 958                                 {
 959                                 /*
 960                                  * We hit something we cannot deal with,
 961                                  * it is no command or separator nor
 962                                  * alphanumeric, so we call this an error.
 963                                  */
 964                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
 965                                        SSL_R_INVALID_COMMAND);
 966                                 retval = found = 0;
 967                                 l++;
 968                                 break;
 969                                 }
 970
 971                         if (rule == CIPHER_SPECIAL)
 972                                 {
 973                                 found = 0; /* unused -- avoid compiler warning */
 974                                 break;  /* special treatment */
 975                                 }
 976
 977                         /* check for multi-part specification */
 978                         if (ch == '+')
 979                                 {
 980                                 multi=1;
 981                                 l++;
 982                                 }
 983                         else
 984                                 multi=0;
 985
 986                         /*
 987                          * Now search for the cipher alias in the ca_list. Be careful
 988                          * with the strncmp, because the "buflen" limitation
 989                          * will make the rule "ADH:SOME" and the cipher
 990                          * "ADH-MY-CIPHER" look like a match for buflen=3.
 991                          * So additionally check whether the cipher name found
 992                          * has the correct length. We can save a strlen() call:
 993                          * just checking for the '\0' at the right place is
 994                          * sufficient, we have to strncmp() anyway. (We cannot
 995                          * use strcmp(), because buf is not '\0' terminated.)
 996                          */
 997                         j = found = 0;
 998                         cipher_id = 0;
 999                         while (ca_list[j])
1000                                 {
1001                                 if (!strncmp(buf, ca_list[j]->name, buflen) &&
1002                                     (ca_list[j]->name[buflen] == '\0'))
1003                                         {
1004                                         found = 1;
1005                                         break;
1006                                         }
1007                                 else
1008                                         j++;
1009                                 }
1010
1011                         if (!found)
1012                                 break;  /* ignore this entry */
1013
1014                         if (ca_list[j]->algorithm_mkey)
1015                                 {
1016                                 if (alg_mkey)
1017                                         {
1018                                         alg_mkey &= ca_list[j]->algorithm_mkey;
1019                                         if (!alg_mkey) { found = 0; break; }
1020                                         }
1021                                 else
1022                                         alg_mkey = ca_list[j]->algorithm_mkey;
1023                                 }
1024
1025                         if (ca_list[j]->algorithm_auth)
1026                                 {
1027                                 if (alg_auth)
1028                                         {
1029                                         alg_auth &= ca_list[j]->algorithm_auth;
1030                                         if (!alg_auth) { found = 0; break; }
1031                                         }
1032                                 else
1033                                         alg_auth = ca_list[j]->algorithm_auth;
1034                                 }
1035
1036                         if (ca_list[j]->algorithm_enc)
1037                                 {
1038                                 if (alg_enc)
1039                                         {
1040                                         alg_enc &= ca_list[j]->algorithm_enc;
1041                                         if (!alg_enc) { found = 0; break; }
1042                                         }
1043                                 else
1044                                         alg_enc = ca_list[j]->algorithm_enc;
1045                                 }
1046
1047                         if (ca_list[j]->algorithm_mac)
1048                                 {
1049                                 if (alg_mac)
1050                                         {
1051                                         alg_mac &= ca_list[j]->algorithm_mac;
1052                                         if (!alg_mac) { found = 0; break; }
1053                                         }
1054                                 else
1055                                         alg_mac = ca_list[j]->algorithm_mac;
1056                                 }
1057
1058                         if (ca_list[j]->algo_strength & SSL_EXP_MASK)
1059                                 {
1060                                 if (algo_strength & SSL_EXP_MASK)
1061                                         {
1062                                         algo_strength &= (ca_list[j]->algo_strength & SSL_EXP_MASK) | ~SSL_EXP_MASK;
1063                                         if (!(algo_strength & SSL_EXP_MASK)) { found = 0; break; }
1064                                         }
1065                                 else
1066                                         algo_strength |= ca_list[j]->algo_strength & SSL_EXP_MASK;
1067                                 }
1068
1069                         if (ca_list[j]->algo_strength & SSL_STRONG_MASK)
1070                                 {
1071                                 if (algo_strength & SSL_STRONG_MASK)
1072                                         {
1073                                         algo_strength &= (ca_list[j]->algo_strength & SSL_STRONG_MASK) | ~SSL_STRONG_MASK;
1074                                         if (!(algo_strength & SSL_STRONG_MASK)) { found = 0; break; }
1075                                         }
1076                                 else
1077                                         algo_strength |= ca_list[j]->algo_strength & SSL_STRONG_MASK;
1078                                 }
1079
1080                         if (ca_list[j]->valid)
1081                                 {
1082                                 /* explicit ciphersuite found; its protocol version
1083                                  * does not become part of the search pattern!*/
1084
1085                                 cipher_id = ca_list[j]->id;
1086                                 }
1087                         else
1088                                 {
1089                                 /* not an explicit ciphersuite; only in this case, the
1090                                  * protocol version is considered part of the search pattern */
1091
1092                                 if (ca_list[j]->algorithm_ssl)
1093                                         {
1094                                         if (alg_ssl)
1095                                                 {
1096                                                 alg_ssl &= ca_list[j]->algorithm_ssl;
1097                                                 if (!alg_ssl) { found = 0; break; }
1098                                                 }
1099                                         else
1100                                                 alg_ssl = ca_list[j]->algorithm_ssl;
1101                                         }
1102                                 }
1103
1104                         if (!multi) break;
1105                         }
1106
1107                 /*
1108                  * Ok, we have the rule, now apply it
1109                  */
1110                 if (rule == CIPHER_SPECIAL)
1111                         {       /* special command */
1112                         ok = 0;
1113                         if ((buflen == 8) &&
1114                                 !strncmp(buf, "STRENGTH", 8))
1115                                 ok = ssl_cipher_strength_sort(head_p, tail_p);
1116                         else
1117                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1118                                         SSL_R_INVALID_COMMAND);
1119                         if (ok == 0)
1120                                 retval = 0;
1121                         /*
1122                          * We do not support any "multi" options
1123                          * together with "@", so throw away the
1124                          * rest of the command, if any left, until
1125                          * end or ':' is found.
1126                          */
1127                         while ((*l != '\0') && !ITEM_SEP(*l))
1128                                 l++;
1129                         }
1130                 else if (found)
1131                         {
1132                         ssl_cipher_apply_rule(cipher_id,
1133                                 alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength,
1134                                 rule, -1, head_p, tail_p);
1135                         }
1136                 else
1137                         {
1138                         while ((*l != '\0') && !ITEM_SEP(*l))
1139                                 l++;
1140                         }
1141                 if (*l == '\0') break; /* done */
1142                 }
1143
1144         return(retval);
1145         }
1146
1147 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
1148                 STACK_OF(SSL_CIPHER) **cipher_list,
1149                 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
1150                 const char *rule_str)
1151         {
1152         int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
1153         unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl;
1154         STACK_OF(SSL_CIPHER) *cipherstack, *tmp_cipher_list;
1155         const char *rule_p;
1156         CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
1157         SSL_CIPHER **ca_list = NULL;
1158
1159         /*
1160          * Return with error if nothing to do.
1161          */
1162         if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == NULL)
1163                 return NULL;
1164
1165         /*
1166          * To reduce the work to do we only want to process the compiled
1167          * in algorithms, so we first get the mask of disabled ciphers.
1168          */
1169         ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl);
1170
1171         /*
1172          * Now we have to collect the available ciphers from the compiled
1173          * in ciphers. We cannot get more than the number compiled in, so
1174          * it is used for allocation.
1175          */
1176         num_of_ciphers = ssl_method->num_ciphers();
1177 #ifdef KSSL_DEBUG
1178         printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers);
1179 #endif    /* KSSL_DEBUG */
1180         co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
1181         if (co_list == NULL)
1182                 {
1183                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
1184                 return(NULL);   /* Failure */
1185                 }
1186
1187         ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers,
1188                                    disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl,
1189                                    co_list, &head, &tail);
1190
1191
1192         /* Now arrange all ciphers by preference: */
1193
1194         /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */
1195         ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1196         ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1197
1198         /* AES is our preferred symmetric cipher */
1199         ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1200
1201         /* Temporarily enable everything else for sorting */
1202         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1203
1204         /* Low priority for MD5 */
1205         ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail);
1206
1207         /* Move anonymous ciphers to the end.  Usually, these will remain disabled.
1208          * (For applications that allow them, they aren't too bad, but we prefer
1209          * authenticated ciphers.) */
1210         ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1211
1212         /* Move ciphers without forward secrecy to the end */
1213         ssl_cipher_apply_rule(0, 0, SSL_aECDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1214         /* ssl_cipher_apply_rule(0, 0, SSL_aDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); */
1215         ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1216         ssl_cipher_apply_rule(0, SSL_kPSK, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1217         ssl_cipher_apply_rule(0, SSL_kKRB5, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1218
1219         /* RC4 is sort-of broken -- move the the end */
1220         ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1221
1222         /* Now sort by symmetric encryption strength.  The above ordering remains
1223          * in force within each class */
1224         if (!ssl_cipher_strength_sort(&head, &tail))
1225                 {
1226                 OPENSSL_free(co_list);
1227                 return NULL;
1228                 }
1229
1230         /* Now disable everything (maintaining the ordering!) */
1231         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1232
1233
1234         /*
1235          * We also need cipher aliases for selecting based on the rule_str.
1236          * There might be two types of entries in the rule_str: 1) names
1237          * of ciphers themselves 2) aliases for groups of ciphers.
1238          * For 1) we need the available ciphers and for 2) the cipher
1239          * groups of cipher_aliases added together in one list (otherwise
1240          * we would be happy with just the cipher_aliases table).
1241          */
1242         num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
1243         num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
1244         ca_list =
1245                 (SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
1246         if (ca_list == NULL)
1247                 {
1248                 OPENSSL_free(co_list);
1249                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
1250                 return(NULL);   /* Failure */
1251                 }
1252         ssl_cipher_collect_aliases(ca_list, num_of_group_aliases,
1253                                    disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl,
1254                                    head);
1255
1256         /*
1257          * If the rule_string begins with DEFAULT, apply the default rule
1258          * before using the (possibly available) additional rules.
1259          */
1260         ok = 1;
1261         rule_p = rule_str;
1262         if (strncmp(rule_str,"DEFAULT",7) == 0)
1263                 {
1264                 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
1265                         &head, &tail, ca_list);
1266                 rule_p += 7;
1267                 if (*rule_p == ':')
1268                         rule_p++;
1269                 }
1270
1271         if (ok && (strlen(rule_p) > 0))
1272                 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list);
1273
1274         OPENSSL_free(ca_list);  /* Not needed anymore */
1275
1276         if (!ok)
1277                 {       /* Rule processing failure */
1278                 OPENSSL_free(co_list);
1279                 return(NULL);
1280                 }
1281
1282         /*
1283          * Allocate new "cipherstack" for the result, return with error
1284          * if we cannot get one.
1285          */
1286         if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
1287                 {
1288                 OPENSSL_free(co_list);
1289                 return(NULL);
1290                 }
1291
1292         /*
1293          * The cipher selection for the list is done. The ciphers are added
1294          * to the resulting precedence to the STACK_OF(SSL_CIPHER).
1295          */
1296         for (curr = head; curr != NULL; curr = curr->next)
1297                 {
1298                 if (curr->active)
1299                         {
1300                         sk_SSL_CIPHER_push(cipherstack, curr->cipher);
1301 #ifdef CIPHER_DEBUG
1302                         printf("<%s>\n",curr->cipher->name);
1303 #endif
1304                         }
1305                 }
1306         OPENSSL_free(co_list);  /* Not needed any longer */
1307
1308         tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack);
1309         if (tmp_cipher_list == NULL)
1310                 {
1311                 sk_SSL_CIPHER_free(cipherstack);
1312                 return NULL;
1313                 }
1314         if (*cipher_list != NULL)
1315                 sk_SSL_CIPHER_free(*cipher_list);
1316         *cipher_list = cipherstack;
1317         if (*cipher_list_by_id != NULL)
1318                 sk_SSL_CIPHER_free(*cipher_list_by_id);
1319         *cipher_list_by_id = tmp_cipher_list;
1320         sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
1321
1322         return(cipherstack);
1323         }
1324
1325 char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
1326         {
1327         int is_export,pkl,kl;
1328         const char *ver,*exp_str;
1329         const char *kx,*au,*enc,*mac;
1330         unsigned long alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl,alg2,alg_s;
1331 #ifdef KSSL_DEBUG
1332         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx/%lx/%lx/%lx/%lx\n";
1333 #else
1334         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
1335 #endif /* KSSL_DEBUG */
1336
1337         alg_mkey = cipher->algorithm_mkey;
1338         alg_auth = cipher->algorithm_auth;
1339         alg_enc = cipher->algorithm_enc;
1340         alg_mac = cipher->algorithm_mac;
1341         alg_ssl = cipher->algorithm_ssl;
1342
1343         alg_s=cipher->algo_strength;
1344         alg2=cipher->algorithm2;
1345
1346         is_export=SSL_C_IS_EXPORT(cipher);
1347         pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
1348         kl=SSL_C_EXPORT_KEYLENGTH(cipher);
1349         exp_str=is_export?" export":"";
1350
1351         if (alg_ssl & SSL_SSLV2)
1352                 ver="SSLv2";
1353         else if (alg_ssl & SSL_SSLV3)
1354                 ver="SSLv3";
1355         else
1356                 ver="unknown";
1357
1358         switch (alg_mkey)
1359                 {
1360         case SSL_kRSA:
1361                 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
1362                 break;
1363         case SSL_kDHr:
1364                 kx="DH/RSA";
1365                 break;
1366         case SSL_kDHd:
1367                 kx="DH/DSS";
1368                 break;
1369         case SSL_kKRB5:
1370                 kx="KRB5";
1371                 break;
1372         case SSL_kEDH:
1373                 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
1374                 break;
1375         case SSL_kECDHr:
1376                 kx="ECDH/RSA";
1377                 break;
1378         case SSL_kECDHe:
1379                 kx="ECDH/ECDSA";
1380                 break;
1381         case SSL_kEECDH:
1382                 kx="ECDH";
1383                 break;
1384         case SSL_kPSK:
1385                 kx="PSK";
1386                 break;
1387         default:
1388                 kx="unknown";
1389                 }
1390
1391         switch (alg_auth)
1392                 {
1393         case SSL_aRSA:
1394                 au="RSA";
1395                 break;
1396         case SSL_aDSS:
1397                 au="DSS";
1398                 break;
1399         case SSL_aDH:
1400                 au="DH";
1401                 break;
1402         case SSL_aKRB5:
1403                 au="KRB5";
1404                 break;
1405         case SSL_aECDH:
1406                 au="ECDH";
1407                 break;
1408         case SSL_aNULL:
1409                 au="None";
1410                 break;
1411         case SSL_aECDSA:
1412                 au="ECDSA";
1413                 break;
1414         case SSL_aPSK:
1415                 au="PSK";
1416                 break;
1417         default:
1418                 au="unknown";
1419                 break;
1420                 }
1421
1422         switch (alg_enc)
1423                 {
1424         case SSL_DES:
1425                 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
1426                 break;
1427         case SSL_3DES:
1428                 enc="3DES(168)";
1429                 break;
1430         case SSL_RC4:
1431                 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
1432                   :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
1433                 break;
1434         case SSL_RC2:
1435                 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
1436                 break;
1437         case SSL_IDEA:
1438                 enc="IDEA(128)";
1439                 break;
1440         case SSL_eNULL:
1441                 enc="None";
1442                 break;
1443         case SSL_AES128:
1444                 enc="AES(128)";
1445                 break;
1446         case SSL_AES256:
1447                 enc="AES(256)";
1448                 break;
1449         case SSL_CAMELLIA128:
1450                 enc="Camellia(128)";
1451                 break;
1452         case SSL_CAMELLIA256:
1453                 enc="Camellia(256)";
1454                 break;
1455         case SSL_SEED:
1456                 enc="SEED(128)";
1457                 break;
1458         default:
1459                 enc="unknown";
1460                 break;
1461                 }
1462
1463         switch (alg_mac)
1464                 {
1465         case SSL_MD5:
1466                 mac="MD5";
1467                 break;
1468         case SSL_SHA1:
1469                 mac="SHA1";
1470                 break;
1471         default:
1472                 mac="unknown";
1473                 break;
1474                 }
1475
1476         if (buf == NULL)
1477                 {
1478                 len=128;
1479                 buf=OPENSSL_malloc(len);
1480                 if (buf == NULL) return("OPENSSL_malloc Error");
1481                 }
1482         else if (len < 128)
1483                 return("Buffer too small");
1484
1485 #ifdef KSSL_DEBUG
1486         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl);
1487 #else
1488         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str);
1489 #endif /* KSSL_DEBUG */
1490         return(buf);
1491         }
1492
1493 char *SSL_CIPHER_get_version(const SSL_CIPHER *c)
1494         {
1495         int i;
1496
1497         if (c == NULL) return("(NONE)");
1498         i=(int)(c->id>>24L);
1499         if (i == 3)
1500                 return("TLSv1/SSLv3");
1501         else if (i == 2)
1502                 return("SSLv2");
1503         else
1504                 return("unknown");
1505         }
1506
1507 /* return the actual cipher being used */
1508 const char *SSL_CIPHER_get_name(const SSL_CIPHER *c)
1509         {
1510         if (c != NULL)
1511                 return(c->name);
1512         return("(NONE)");
1513         }
1514
1515 /* number of bits for symmetric cipher */
1516 int SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
1517         {
1518         int ret=0;
1519
1520         if (c != NULL)
1521                 {
1522                 if (alg_bits != NULL) *alg_bits = c->alg_bits;
1523                 ret = c->strength_bits;
1524                 }
1525         return(ret);
1526         }
1527
1528 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
1529         {
1530         SSL_COMP *ctmp;
1531         int i,nn;
1532
1533         if ((n == 0) || (sk == NULL)) return(NULL);
1534         nn=sk_SSL_COMP_num(sk);
1535         for (i=0; i<nn; i++)
1536                 {
1537                 ctmp=sk_SSL_COMP_value(sk,i);
1538                 if (ctmp->id == n)
1539                         return(ctmp);
1540                 }
1541         return(NULL);
1542         }
1543
1544 #ifdef OPENSSL_NO_COMP
1545 void *SSL_COMP_get_compression_methods(void)
1546         {
1547         return NULL;
1548         }
1549 int SSL_COMP_add_compression_method(int id, void *cm)
1550         {
1551         return 1;
1552         }
1553
1554 const char *SSL_COMP_get_name(const void *comp)
1555         {
1556         return NULL;
1557         }
1558 #else
1559 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
1560         {
1561         load_builtin_compressions();
1562         return(ssl_comp_methods);
1563         }
1564
1565 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
1566         {
1567         SSL_COMP *comp;
1568
1569         if (cm == NULL || cm->type == NID_undef)
1570                 return 1;
1571
1572         /* According to draft-ietf-tls-compression-04.txt, the
1573            compression number ranges should be the following:
1574
1575            0 to 63:    methods defined by the IETF
1576            64 to 192:  external party methods assigned by IANA
1577            193 to 255: reserved for private use */
1578         if (id < 193 || id > 255)
1579                 {
1580                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_COMPRESSION_ID_NOT_WITHIN_PRIVATE_RANGE);
1581                 return 0;
1582                 }
1583
1584         MemCheck_off();
1585         comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
1586         comp->id=id;
1587         comp->method=cm;
1588         load_builtin_compressions();
1589         if (ssl_comp_methods
1590                 && !sk_SSL_COMP_find(ssl_comp_methods,comp))
1591                 {
1592                 OPENSSL_free(comp);
1593                 MemCheck_on();
1594                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_DUPLICATE_COMPRESSION_ID);
1595                 return(1);
1596                 }
1597         else if ((ssl_comp_methods == NULL)
1598                 || !sk_SSL_COMP_push(ssl_comp_methods,comp))
1599                 {
1600                 OPENSSL_free(comp);
1601                 MemCheck_on();
1602                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
1603                 return(1);
1604                 }
1605         else
1606                 {
1607                 MemCheck_on();
1608                 return(0);
1609                 }
1610         }
1611
1612 const char *SSL_COMP_get_name(const COMP_METHOD *comp)
1613         {
1614         if (comp)
1615                 return comp->name;
1616         return NULL;
1617         }
1618
1619 #endif