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 <openssl/engine.h>
 147 #include "ssl_locl.h"
 148
 149 #define SSL_ENC_DES_IDX         0
 150 #define SSL_ENC_3DES_IDX        1
 151 #define SSL_ENC_RC4_IDX         2
 152 #define SSL_ENC_RC2_IDX         3
 153 #define SSL_ENC_IDEA_IDX        4
 154 #define SSL_ENC_NULL_IDX        5
 155 #define SSL_ENC_AES128_IDX      6
 156 #define SSL_ENC_AES256_IDX      7
 157 #define SSL_ENC_CAMELLIA128_IDX 8
 158 #define SSL_ENC_CAMELLIA256_IDX 9
 159 #define SSL_ENC_GOST89_IDX      10
 160 #define SSL_ENC_SEED_IDX        11
 161 #define SSL_ENC_NUM_IDX         12
 162
 163
 164 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
 165         NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
 166         };
 167
 168 #define SSL_COMP_NULL_IDX       0
 169 #define SSL_COMP_ZLIB_IDX       1
 170 #define SSL_COMP_NUM_IDX        2
 171
 172 static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
 173
 174 #define SSL_MD_MD5_IDX  0
 175 #define SSL_MD_SHA1_IDX 1
 176 #define SSL_MD_GOST94_IDX 2
 177 #define SSL_MD_GOST89MAC_IDX 3
 178 /*Constant SSL_MAX_DIGEST equal to size of digests array should be
 179  * defined in the
 180  * ssl_locl.h */
 181 #define SSL_MD_NUM_IDX  SSL_MAX_DIGEST
 182 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
 183         NULL,NULL,NULL,NULL
 184         };
 185 /* PKEY_TYPE for GOST89MAC is known in advance, but, because
 186  * implementation is engine-provided, we'll fill it only if
 187  * corresponding EVP_PKEY_METHOD is found
 188  */
 189 static int  ssl_mac_pkey_id[SSL_MD_NUM_IDX]={
 190         EVP_PKEY_HMAC,EVP_PKEY_HMAC,EVP_PKEY_HMAC,NID_undef
 191         };
 192
 193 static int ssl_mac_secret_size[SSL_MD_NUM_IDX]={
 194         0,0,0,0
 195         };
 196
 197 static int ssl_handshake_digest_flag[SSL_MD_NUM_IDX]={
 198         SSL_HANDSHAKE_MAC_MD5,SSL_HANDSHAKE_MAC_SHA,
 199         SSL_HANDSHAKE_MAC_GOST94,0
 200         };
 201
 202 #define CIPHER_ADD      1
 203 #define CIPHER_KILL     2
 204 #define CIPHER_DEL      3
 205 #define CIPHER_ORD      4
 206 #define CIPHER_SPECIAL  5
 207
 208 typedef struct cipher_order_st
 209         {
 210         SSL_CIPHER *cipher;
 211         int active;
 212         int dead;
 213         struct cipher_order_st *next,*prev;
 214         } CIPHER_ORDER;
 215
 216 static const SSL_CIPHER cipher_aliases[]={
 217         /* "ALL" doesn't include eNULL (must be specifically enabled) */
 218         {0,SSL_TXT_ALL,0,     0,0,~SSL_eNULL,0,0,0,0,0,0},
 219         /* "COMPLEMENTOFALL" */
 220         {0,SSL_TXT_CMPALL,0,  0,0,SSL_eNULL,0,0,0,0,0,0},
 221
 222         /* "COMPLEMENTOFDEFAULT" (does *not* include ciphersuites not found in ALL!) */
 223         {0,SSL_TXT_CMPDEF,0,  SSL_kEDH|SSL_kEECDH,SSL_aNULL,~SSL_eNULL,0,0,0,0,0,0},
 224
 225         /* key exchange aliases
 226          * (some of those using only a single bit here combine
 227          * multiple key exchange algs according to the RFCs,
 228          * e.g. kEDH combines DHE_DSS and DHE_RSA) */
 229         {0,SSL_TXT_kRSA,0,    SSL_kRSA,  0,0,0,0,0,0,0,0},
 230
 231         {0,SSL_TXT_kDHr,0,    SSL_kDHr,  0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 232         {0,SSL_TXT_kDHd,0,    SSL_kDHd,  0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 233         {0,SSL_TXT_kDH,0,     SSL_kDHr|SSL_kDHd,0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 234         {0,SSL_TXT_kEDH,0,    SSL_kEDH,  0,0,0,0,0,0,0,0},
 235         {0,SSL_TXT_DH,0,      SSL_kDHr|SSL_kDHd|SSL_kEDH,0,0,0,0,0,0,0,0},
 236
 237         {0,SSL_TXT_kKRB5,0,   SSL_kKRB5, 0,0,0,0,0,0,0,0},
 238
 239         {0,SSL_TXT_kECDHr,0,  SSL_kECDHr,0,0,0,0,0,0,0,0},
 240         {0,SSL_TXT_kECDHe,0,  SSL_kECDHe,0,0,0,0,0,0,0,0},
 241         {0,SSL_TXT_kECDH,0,   SSL_kECDHr|SSL_kECDHe,0,0,0,0,0,0,0,0},
 242         {0,SSL_TXT_kEECDH,0,  SSL_kEECDH,0,0,0,0,0,0,0,0},
 243         {0,SSL_TXT_ECDH,0,    SSL_kECDHr|SSL_kECDHe|SSL_kEECDH,0,0,0,0,0,0,0,0},
 244
 245         {0,SSL_TXT_kPSK,0,    SSL_kPSK,  0,0,0,0,0,0,0,0},
 246
 247
 248         /* server authentication aliases */
 249         {0,SSL_TXT_aRSA,0,    0,SSL_aRSA,  0,0,0,0,0,0,0},
 250         {0,SSL_TXT_aDSS,0,    0,SSL_aDSS,  0,0,0,0,0,0,0},
 251         {0,SSL_TXT_DSS,0,     0,SSL_aDSS,   0,0,0,0,0,0,0},
 252         {0,SSL_TXT_aKRB5,0,   0,SSL_aKRB5, 0,0,0,0,0,0,0},
 253         {0,SSL_TXT_aNULL,0,   0,SSL_aNULL, 0,0,0,0,0,0,0},
 254         {0,SSL_TXT_aDH,0,     0,SSL_aDH,   0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 255         {0,SSL_TXT_aECDH,0,   0,SSL_aECDH, 0,0,0,0,0,0,0},
 256         {0,SSL_TXT_aECDSA,0,  0,SSL_aECDSA,0,0,0,0,0,0,0},
 257         {0,SSL_TXT_ECDSA,0,   0,SSL_aECDSA, 0,0,0,0,0,0,0},
 258         {0,SSL_TXT_aPSK,0,    0,SSL_aPSK,  0,0,0,0,0,0,0},
 259
 260
 261         /* aliases combining key exchange and server authentication */
 262         {0,SSL_TXT_EDH,0,     SSL_kEDH,~SSL_aNULL,0,0,0,0,0,0,0},
 263         {0,SSL_TXT_EECDH,0,   SSL_kEECDH,~SSL_aNULL,0,0,0,0,0,0,0},
 264         {0,SSL_TXT_NULL,0,    0,0,SSL_eNULL, 0,0,0,0,0,0},
 265         {0,SSL_TXT_KRB5,0,    SSL_kKRB5,SSL_aKRB5,0,0,0,0,0,0,0},
 266         {0,SSL_TXT_RSA,0,     SSL_kRSA,SSL_aRSA,0,0,0,0,0,0,0},
 267         {0,SSL_TXT_ADH,0,     SSL_kEDH,SSL_aNULL,0,0,0,0,0,0,0},
 268         {0,SSL_TXT_AECDH,0,   SSL_kEECDH,SSL_aNULL,0,0,0,0,0,0,0},
 269         {0,SSL_TXT_PSK,0,     SSL_kPSK,SSL_aPSK,0,0,0,0,0,0,0},
 270
 271
 272         /* symmetric encryption aliases */
 273         {0,SSL_TXT_DES,0,     0,0,SSL_DES,   0,0,0,0,0,0},
 274         {0,SSL_TXT_3DES,0,    0,0,SSL_3DES,  0,0,0,0,0,0},
 275         {0,SSL_TXT_RC4,0,     0,0,SSL_RC4,   0,0,0,0,0,0},
 276         {0,SSL_TXT_RC2,0,     0,0,SSL_RC2,   0,0,0,0,0,0},
 277         {0,SSL_TXT_IDEA,0,    0,0,SSL_IDEA,  0,0,0,0,0,0},
 278         {0,SSL_TXT_SEED,0,    0,0,SSL_SEED,  0,0,0,0,0,0},
 279         {0,SSL_TXT_eNULL,0,   0,0,SSL_eNULL, 0,0,0,0,0,0},
 280         {0,SSL_TXT_AES128,0,  0,0,SSL_AES128,0,0,0,0,0,0},
 281         {0,SSL_TXT_AES256,0,  0,0,SSL_AES256,0,0,0,0,0,0},
 282         {0,SSL_TXT_AES,0,     0,0,SSL_AES128|SSL_AES256,0,0,0,0,0,0},
 283         {0,SSL_TXT_CAMELLIA128,0,0,0,SSL_CAMELLIA128,0,0,0,0,0,0},
 284         {0,SSL_TXT_CAMELLIA256,0,0,0,SSL_CAMELLIA256,0,0,0,0,0,0},
 285         {0,SSL_TXT_CAMELLIA   ,0,0,0,SSL_CAMELLIA128|SSL_CAMELLIA256,0,0,0,0,0,0},
 286
 287         /* MAC aliases */
 288         {0,SSL_TXT_MD5,0,     0,0,0,SSL_MD5,   0,0,0,0,0},
 289         {0,SSL_TXT_SHA1,0,    0,0,0,SSL_SHA1,  0,0,0,0,0},
 290         {0,SSL_TXT_SHA,0,     0,0,0,SSL_SHA1,  0,0,0,0,0},
 291         {0,SSL_TXT_GOST94,0,     0,0,0,SSL_GOST94,  0,0,0,0,0},
 292         {0,SSL_TXT_GOST89MAC,0,     0,0,0,SSL_GOST89MAC,  0,0,0,0,0},
 293
 294         /* protocol version aliases */
 295         {0,SSL_TXT_SSLV2,0,   0,0,0,0,SSL_SSLV2, 0,0,0,0},
 296         {0,SSL_TXT_SSLV3,0,   0,0,0,0,SSL_SSLV3, 0,0,0,0},
 297         {0,SSL_TXT_TLSV1,0,   0,0,0,0,SSL_TLSV1, 0,0,0,0},
 298
 299         /* export flag */
 300         {0,SSL_TXT_EXP,0,     0,0,0,0,0,SSL_EXPORT,0,0,0},
 301         {0,SSL_TXT_EXPORT,0,  0,0,0,0,0,SSL_EXPORT,0,0,0},
 302
 303         /* strength classes */
 304         {0,SSL_TXT_EXP40,0,   0,0,0,0,0,SSL_EXP40, 0,0,0},
 305         {0,SSL_TXT_EXP56,0,   0,0,0,0,0,SSL_EXP56, 0,0,0},
 306         {0,SSL_TXT_LOW,0,     0,0,0,0,0,SSL_LOW,   0,0,0},
 307         {0,SSL_TXT_MEDIUM,0,  0,0,0,0,0,SSL_MEDIUM,0,0,0},
 308         {0,SSL_TXT_HIGH,0,    0,0,0,0,0,SSL_HIGH,  0,0,0},
 309         };
 310 /* Search for public key algorithm with given name and
 311  * return its pkey_id if it is available. Otherwise return 0
 312  */
 313 static int get_optional_pkey_id(const char *pkey_name)
 314         {
 315         const EVP_PKEY_ASN1_METHOD *ameth;
 316         ENGINE *tmpeng = NULL;
 317         int pkey_id=0;
 318         ameth = EVP_PKEY_asn1_find_str(&tmpeng,pkey_name,-1);
 319         if (ameth)
 320                 {
 321                 EVP_PKEY_asn1_get0_info(&pkey_id, NULL,NULL,NULL,NULL,ameth);
 322                 }
 323         if (tmpeng) ENGINE_finish(tmpeng);
 324         return pkey_id;
 325         }
 326
 327 void ssl_load_ciphers(void)
 328         {
 329         ssl_cipher_methods[SSL_ENC_DES_IDX]=
 330                 EVP_get_cipherbyname(SN_des_cbc);
 331         ssl_cipher_methods[SSL_ENC_3DES_IDX]=
 332                 EVP_get_cipherbyname(SN_des_ede3_cbc);
 333         ssl_cipher_methods[SSL_ENC_RC4_IDX]=
 334                 EVP_get_cipherbyname(SN_rc4);
 335         ssl_cipher_methods[SSL_ENC_RC2_IDX]=
 336                 EVP_get_cipherbyname(SN_rc2_cbc);
 337 #ifndef OPENSSL_NO_IDEA
 338         ssl_cipher_methods[SSL_ENC_IDEA_IDX]=
 339                 EVP_get_cipherbyname(SN_idea_cbc);
 340 #else
 341         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= NULL;
 342 #endif
 343         ssl_cipher_methods[SSL_ENC_AES128_IDX]=
 344           EVP_get_cipherbyname(SN_aes_128_cbc);
 345         ssl_cipher_methods[SSL_ENC_AES256_IDX]=
 346           EVP_get_cipherbyname(SN_aes_256_cbc);
 347         ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX]=
 348           EVP_get_cipherbyname(SN_camellia_128_cbc);
 349         ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX]=
 350           EVP_get_cipherbyname(SN_camellia_256_cbc);
 351         ssl_cipher_methods[SSL_ENC_GOST89_IDX]=
 352           EVP_get_cipherbyname(SN_gost89_cnt);
 353         ssl_cipher_methods[SSL_ENC_SEED_IDX]=
 354           EVP_get_cipherbyname(SN_seed_cbc);
 355
 356         ssl_digest_methods[SSL_MD_MD5_IDX]=
 357                 EVP_get_digestbyname(SN_md5);
 358         ssl_mac_secret_size[SSL_MD_MD5_IDX]=
 359                 EVP_MD_size(ssl_digest_methods[SSL_MD_MD5_IDX]);
 360         ssl_digest_methods[SSL_MD_SHA1_IDX]=
 361                 EVP_get_digestbyname(SN_sha1);
 362         ssl_mac_secret_size[SSL_MD_SHA1_IDX]=
 363                 EVP_MD_size(ssl_digest_methods[SSL_MD_SHA1_IDX]);
 364         ssl_digest_methods[SSL_MD_GOST94_IDX]=
 365                 EVP_get_digestbyname(SN_id_GostR3411_94);
 366         if (ssl_digest_methods[SSL_MD_GOST94_IDX])
 367                 {
 368                 ssl_mac_secret_size[SSL_MD_GOST94_IDX]=
 369                         EVP_MD_size(ssl_digest_methods[SSL_MD_GOST94_IDX]);
 370                 }
 371         ssl_digest_methods[SSL_MD_GOST89MAC_IDX]=
 372                 EVP_get_digestbyname(SN_id_Gost28147_89_MAC);
 373                 ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX] = get_optional_pkey_id("gost-mac");
 374                 if (ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX]) {
 375                         ssl_mac_secret_size[SSL_MD_GOST89MAC_IDX]=32;
 376                 }
 377
 378         }
 379 #ifndef OPENSSL_NO_COMP
 380
 381 static int sk_comp_cmp(const SSL_COMP * const *a,
 382                         const SSL_COMP * const *b)
 383         {
 384         return((*a)->id-(*b)->id);
 385         }
 386
 387 static void load_builtin_compressions(void)
 388         {
 389         int got_write_lock = 0;
 390
 391         CRYPTO_r_lock(CRYPTO_LOCK_SSL);
 392         if (ssl_comp_methods == NULL)
 393                 {
 394                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
 395                 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
 396                 got_write_lock = 1;
 397
 398                 if (ssl_comp_methods == NULL)
 399                         {
 400                         SSL_COMP *comp = NULL;
 401
 402                         MemCheck_off();
 403                         ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
 404                         if (ssl_comp_methods != NULL)
 405                                 {
 406                                 comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
 407                                 if (comp != NULL)
 408                                         {
 409                                         comp->method=COMP_zlib();
 410                                         if (comp->method
 411                                                 && comp->method->type == NID_undef)
 412                                                 OPENSSL_free(comp);
 413                                         else
 414                                                 {
 415                                                 comp->id=SSL_COMP_ZLIB_IDX;
 416                                                 comp->name=comp->method->name;
 417                                                 sk_SSL_COMP_push(ssl_comp_methods,comp);
 418                                                 }
 419                                         }
 420                                 }
 421                         MemCheck_on();
 422                         }
 423                 }
 424
 425         if (got_write_lock)
 426                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
 427         else
 428                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
 429         }
 430 #endif
 431
 432 int ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc,
 433              const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size,SSL_COMP **comp)
 434         {
 435         int i;
 436         SSL_CIPHER *c;
 437
 438         c=s->cipher;
 439         if (c == NULL) return(0);
 440         if (comp != NULL)
 441                 {
 442                 SSL_COMP ctmp;
 443 #ifndef OPENSSL_NO_COMP
 444                 load_builtin_compressions();
 445 #endif
 446
 447                 *comp=NULL;
 448                 ctmp.id=s->compress_meth;
 449                 if (ssl_comp_methods != NULL)
 450                         {
 451                         i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
 452                         if (i >= 0)
 453                                 *comp=sk_SSL_COMP_value(ssl_comp_methods,i);
 454                         else
 455                                 *comp=NULL;
 456                         }
 457                 }
 458
 459         if ((enc == NULL) || (md == NULL)) return(0);
 460
 461         switch (c->algorithm_enc)
 462                 {
 463         case SSL_DES:
 464                 i=SSL_ENC_DES_IDX;
 465                 break;
 466         case SSL_3DES:
 467                 i=SSL_ENC_3DES_IDX;
 468                 break;
 469         case SSL_RC4:
 470                 i=SSL_ENC_RC4_IDX;
 471                 break;
 472         case SSL_RC2:
 473                 i=SSL_ENC_RC2_IDX;
 474                 break;
 475         case SSL_IDEA:
 476                 i=SSL_ENC_IDEA_IDX;
 477                 break;
 478         case SSL_eNULL:
 479                 i=SSL_ENC_NULL_IDX;
 480                 break;
 481         case SSL_AES128:
 482                 i=SSL_ENC_AES128_IDX;
 483                 break;
 484         case SSL_AES256:
 485                 i=SSL_ENC_AES256_IDX;
 486                 break;
 487         case SSL_CAMELLIA128:
 488                 i=SSL_ENC_CAMELLIA128_IDX;
 489                 break;
 490         case SSL_CAMELLIA256:
 491                 i=SSL_ENC_CAMELLIA256_IDX;
 492                 break;
 493         case SSL_eGOST2814789CNT:
 494                 i=SSL_ENC_GOST89_IDX;
 495                 break;
 496         case SSL_SEED:
 497                 i=SSL_ENC_SEED_IDX;
 498                 break;
 499         default:
 500                 i= -1;
 501                 break;
 502                 }
 503
 504         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
 505                 *enc=NULL;
 506         else
 507                 {
 508                 if (i == SSL_ENC_NULL_IDX)
 509                         *enc=EVP_enc_null();
 510                 else
 511                         *enc=ssl_cipher_methods[i];
 512                 }
 513
 514         switch (c->algorithm_mac)
 515                 {
 516         case SSL_MD5:
 517                 i=SSL_MD_MD5_IDX;
 518                 break;
 519         case SSL_SHA1:
 520                 i=SSL_MD_SHA1_IDX;
 521                 break;
 522         case SSL_GOST94:
 523                 i = SSL_MD_GOST94_IDX;
 524                 break;
 525         case SSL_GOST89MAC:
 526                 i = SSL_MD_GOST89MAC_IDX;
 527                 break;
 528         default:
 529                 i= -1;
 530                 break;
 531                 }
 532         if ((i < 0) || (i > SSL_MD_NUM_IDX))
 533         {
 534                 *md=NULL;
 535                 if (mac_pkey_type!=NULL) *mac_pkey_type = NID_undef;
 536                 if (mac_secret_size!=NULL) *mac_secret_size = 0;
 537
 538         }
 539         else
 540         {
 541                 *md=ssl_digest_methods[i];
 542                 if (mac_pkey_type!=NULL) *mac_pkey_type = ssl_mac_pkey_id[i];
 543                 if (mac_secret_size!=NULL) *mac_secret_size = ssl_mac_secret_size[i];
 544         }
 545
 546         if ((*enc != NULL) && (*md != NULL) && (!mac_pkey_type||*mac_pkey_type != NID_undef))
 547                 return(1);
 548         else
 549                 return(0);
 550         }
 551
 552 int ssl_get_handshake_digest(int idx, long *mask, const EVP_MD **md)
 553 {
 554         if (idx <0||idx>=SSL_MD_NUM_IDX)
 555                 {
 556                 return 0;
 557                 }
 558         if (ssl_handshake_digest_flag[idx]==0) return 0;
 559         *mask = ssl_handshake_digest_flag[idx];
 560         *md = ssl_digest_methods[idx];
 561         return 1;
 562 }
 563
 564 #define ITEM_SEP(a) \
 565         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
 566
 567 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
 568              CIPHER_ORDER **tail)
 569         {
 570         if (curr == *tail) return;
 571         if (curr == *head)
 572                 *head=curr->next;
 573         if (curr->prev != NULL)
 574                 curr->prev->next=curr->next;
 575         if (curr->next != NULL)
 576                 curr->next->prev=curr->prev;
 577         (*tail)->next=curr;
 578         curr->prev= *tail;
 579         curr->next=NULL;
 580         *tail=curr;
 581         }
 582
 583 static void ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr,
 584              CIPHER_ORDER **tail)
 585         {
 586         if (curr == *head) return;
 587         if (curr == *tail)
 588                 *tail=curr->prev;
 589         if (curr->next != NULL)
 590                 curr->next->prev=curr->prev;
 591         if (curr->prev != NULL)
 592                 curr->prev->next=curr->next;
 593         (*head)->prev=curr;
 594         curr->next= *head;
 595         curr->prev=NULL;
 596         *head=curr;
 597         }
 598
 599 static void ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth, unsigned long *enc, unsigned long *mac, unsigned long *ssl)
 600         {
 601         *mkey = 0;
 602         *auth = 0;
 603         *enc = 0;
 604         *mac = 0;
 605         *ssl = 0;
 606
 607 #ifdef OPENSSL_NO_RSA
 608         *mkey |= SSL_kRSA;
 609         *auth |= SSL_aRSA;
 610 #endif
 611 #ifdef OPENSSL_NO_DSA
 612         *auth |= SSL_aDSS;
 613 #endif
 614         *mkey |= SSL_kDHr|SSL_kDHd; /* no such ciphersuites supported! */
 615         *auth |= SSL_aDH;
 616 #ifdef OPENSSL_NO_DH
 617         *mkey |= SSL_kDHr|SSL_kDHd|SSL_kEDH;
 618         *auth |= SSL_aDH;
 619 #endif
 620 #ifdef OPENSSL_NO_KRB5
 621         *mkey |= SSL_kKRB5;
 622         *auth |= SSL_aKRB5;
 623 #endif
 624 #ifdef OPENSSL_NO_ECDSA
 625         *auth |= SSL_aECDSA;
 626 #endif
 627 #ifdef OPENSSL_NO_ECDH
 628         *mkey |= SSL_kECDHe|SSL_kECDHr;
 629         *auth |= SSL_aECDH;
 630 #endif
 631 #ifdef OPENSSL_NO_PSK
 632         *mkey |= SSL_kPSK;
 633         *auth |= SSL_aPSK;
 634 #endif
 635         /* Check for presence of GOST 34.10 algorithms, and if they
 636          * do not present, disable  appropriate auth and key exchange */
 637         if (!get_optional_pkey_id("gost94")) {
 638                 *auth |= SSL_aGOST94;
 639         }
 640         if (!get_optional_pkey_id("gost2001")) {
 641                 *auth |= SSL_aGOST01;
 642         }
 643         /* Disable GOST key exchange if no GOST signature algs are available * */
 644         if ((*auth & (SSL_aGOST94|SSL_aGOST01)) == (SSL_aGOST94|SSL_aGOST01)) {
 645                 *mkey |= SSL_kGOST;
 646         }
 647 #ifdef SSL_FORBID_ENULL
 648         *enc |= SSL_eNULL;
 649 #endif
 650
 651
 652
 653         *enc |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
 654         *enc |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
 655         *enc |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
 656         *enc |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
 657         *enc |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
 658         *enc |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES128:0;
 659         *enc |= (ssl_cipher_methods[SSL_ENC_AES256_IDX] == NULL) ? SSL_AES256:0;
 660         *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] == NULL) ? SSL_CAMELLIA128:0;
 661         *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] == NULL) ? SSL_CAMELLIA256:0;
 662         *enc |= (ssl_cipher_methods[SSL_ENC_GOST89_IDX] == NULL) ? SSL_eGOST2814789CNT:0;
 663         *enc |= (ssl_cipher_methods[SSL_ENC_SEED_IDX] == NULL) ? SSL_SEED:0;
 664
 665         *mac |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
 666         *mac |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
 667         *mac |= (ssl_digest_methods[SSL_MD_GOST94_IDX] == NULL) ? SSL_GOST94:0;
 668         *mac |= (ssl_digest_methods[SSL_MD_GOST89MAC_IDX] == NULL || ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX]==NID_undef)? SSL_GOST89MAC:0;
 669
 670         }
 671
 672 static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
 673                 int num_of_ciphers,
 674                 unsigned long disabled_mkey, unsigned long disabled_auth,
 675                 unsigned long disabled_enc, unsigned long disabled_mac,
 676                 unsigned long disabled_ssl,
 677                 CIPHER_ORDER *co_list,
 678                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
 679         {
 680         int i, co_list_num;
 681         SSL_CIPHER *c;
 682
 683         /*
 684          * We have num_of_ciphers descriptions compiled in, depending on the
 685          * method selected (SSLv2 and/or SSLv3, TLSv1 etc).
 686          * These will later be sorted in a linked list with at most num
 687          * entries.
 688          */
 689
 690         /* Get the initial list of ciphers */
 691         co_list_num = 0;        /* actual count of ciphers */
 692         for (i = 0; i < num_of_ciphers; i++)
 693                 {
 694                 c = ssl_method->get_cipher(i);
 695                 /* drop those that use any of that is not available */
 696                 if ((c != NULL) && c->valid &&
 697                     !(c->algorithm_mkey & disabled_mkey) &&
 698                     !(c->algorithm_auth & disabled_auth) &&
 699                     !(c->algorithm_enc & disabled_enc) &&
 700                     !(c->algorithm_mac & disabled_mac) &&
 701                     !(c->algorithm_ssl & disabled_ssl))
 702                         {
 703                         co_list[co_list_num].cipher = c;
 704                         co_list[co_list_num].next = NULL;
 705                         co_list[co_list_num].prev = NULL;
 706                         co_list[co_list_num].active = 0;
 707                         co_list_num++;
 708 #ifdef KSSL_DEBUG
 709                         printf("\t%d: %s %lx %lx %lx\n",i,c->name,c->id,c->algorithm_mkey,c->algorithm_auth);
 710 #endif  /* KSSL_DEBUG */
 711                         /*
 712                         if (!sk_push(ca_list,(char *)c)) goto err;
 713                         */
 714                         }
 715                 }
 716
 717         /*
 718          * Prepare linked list from list entries
 719          */
 720         if (co_list_num > 0)
 721                 {
 722                 co_list[0].prev = NULL;
 723
 724                 if (co_list_num > 1)
 725                         {
 726                         co_list[0].next = &co_list[1];
 727
 728                         for (i = 1; i < co_list_num - 1; i++)
 729                                 {
 730                                 co_list[i].prev = &co_list[i - 1];
 731                                 co_list[i].next = &co_list[i + 1];
 732                                 }
 733
 734                         co_list[co_list_num - 1].prev = &co_list[co_list_num - 2];
 735                         }
 736
 737                 co_list[co_list_num - 1].next = NULL;
 738
 739                 *head_p = &co_list[0];
 740                 *tail_p = &co_list[co_list_num - 1];
 741                 }
 742         }
 743
 744 static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list,
 745                         int num_of_group_aliases,
 746                         unsigned long disabled_mkey, unsigned long disabled_auth,
 747                         unsigned long disabled_enc, unsigned long disabled_mac,
 748                         unsigned long disabled_ssl,
 749                         CIPHER_ORDER *head)
 750         {
 751         CIPHER_ORDER *ciph_curr;
 752         SSL_CIPHER **ca_curr;
 753         int i;
 754         unsigned long mask_mkey = ~disabled_mkey;
 755         unsigned long mask_auth = ~disabled_auth;
 756         unsigned long mask_enc = ~disabled_enc;
 757         unsigned long mask_mac = ~disabled_mac;
 758         unsigned long mask_ssl = ~disabled_ssl;
 759
 760         /*
 761          * First, add the real ciphers as already collected
 762          */
 763         ciph_curr = head;
 764         ca_curr = ca_list;
 765         while (ciph_curr != NULL)
 766                 {
 767                 *ca_curr = ciph_curr->cipher;
 768                 ca_curr++;
 769                 ciph_curr = ciph_curr->next;
 770                 }
 771
 772         /*
 773          * Now we add the available ones from the cipher_aliases[] table.
 774          * They represent either one or more algorithms, some of which
 775          * in any affected category must be supported (set in enabled_mask),
 776          * or represent a cipher strength value (will be added in any case because algorithms=0).
 777          */
 778         for (i = 0; i < num_of_group_aliases; i++)
 779                 {
 780                 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey;
 781                 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth;
 782                 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc;
 783                 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac;
 784                 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl;
 785
 786                 if (algorithm_mkey)
 787                         if ((algorithm_mkey & mask_mkey) == 0)
 788                                 continue;
 789
 790                 if (algorithm_auth)
 791                         if ((algorithm_auth & mask_auth) == 0)
 792                                 continue;
 793
 794                 if (algorithm_enc)
 795                         if ((algorithm_enc & mask_enc) == 0)
 796                                 continue;
 797
 798                 if (algorithm_mac)
 799                         if ((algorithm_mac & mask_mac) == 0)
 800                                 continue;
 801
 802                 if (algorithm_ssl)
 803                         if ((algorithm_ssl & mask_ssl) == 0)
 804                                 continue;
 805
 806                 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
 807                 ca_curr++;
 808                 }
 809
 810         *ca_curr = NULL;        /* end of list */
 811         }
 812
 813 static void ssl_cipher_apply_rule(unsigned long cipher_id,
 814                 unsigned long alg_mkey, unsigned long alg_auth,
 815                 unsigned long alg_enc, unsigned long alg_mac,
 816                 unsigned long alg_ssl,
 817                 unsigned long algo_strength,
 818                 int rule, int strength_bits,
 819                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
 820         {
 821         CIPHER_ORDER *head, *tail, *curr, *curr2, *last;
 822         SSL_CIPHER *cp;
 823         int reverse = 0;
 824
 825 #ifdef CIPHER_DEBUG
 826         printf("Applying rule %d with %08lx/%08lx/%08lx/%08lx/%08lx %08lx (%d)\n",
 827                 rule, alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength, strength_bits);
 828 #endif
 829
 830         if (rule == CIPHER_DEL)
 831                 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */
 832
 833         head = *head_p;
 834         tail = *tail_p;
 835
 836         if (reverse)
 837                 {
 838                 curr = tail;
 839                 last = head;
 840                 }
 841         else
 842                 {
 843                 curr = head;
 844                 last = tail;
 845                 }
 846
 847         curr2 = curr;
 848         for (;;)
 849                 {
 850                 if ((curr == NULL) || (curr == last)) break;
 851                 curr = curr2;
 852                 curr2 = reverse ? curr->prev : curr->next;
 853
 854                 cp = curr->cipher;
 855
 856                 /*
 857                  * Selection criteria is either the value of strength_bits
 858                  * or the algorithms used.
 859                  */
 860                 if (strength_bits >= 0)
 861                         {
 862                         if (strength_bits != cp->strength_bits)
 863                                 continue;
 864                         }
 865                 else
 866                         {
 867 #ifdef CIPHER_DEBUG
 868                         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);
 869 #endif
 870
 871                         if (alg_mkey && !(alg_mkey & cp->algorithm_mkey))
 872                                 continue;
 873                         if (alg_auth && !(alg_auth & cp->algorithm_auth))
 874                                 continue;
 875                         if (alg_enc && !(alg_enc & cp->algorithm_enc))
 876                                 continue;
 877                         if (alg_mac && !(alg_mac & cp->algorithm_mac))
 878                                 continue;
 879                         if (alg_ssl && !(alg_ssl & cp->algorithm_ssl))
 880                                 continue;
 881                         if ((algo_strength & SSL_EXP_MASK) && !(algo_strength & SSL_EXP_MASK & cp->algo_strength))
 882                                 continue;
 883                         if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
 884                                 continue;
 885                         }
 886
 887 #ifdef CIPHER_DEBUG
 888                 printf("Action = %d\n", rule);
 889 #endif
 890
 891                 /* add the cipher if it has not been added yet. */
 892                 if (rule == CIPHER_ADD)
 893                         {
 894                         /* reverse == 0 */
 895                         if (!curr->active)
 896                                 {
 897                                 ll_append_tail(&head, curr, &tail);
 898                                 curr->active = 1;
 899                                 }
 900                         }
 901                 /* Move the added cipher to this location */
 902                 else if (rule == CIPHER_ORD)
 903                         {
 904                         /* reverse == 0 */
 905                         if (curr->active)
 906                                 {
 907                                 ll_append_tail(&head, curr, &tail);
 908                                 }
 909                         }
 910                 else if (rule == CIPHER_DEL)
 911                         {
 912                         /* reverse == 1 */
 913                         if (curr->active)
 914                                 {
 915                                 /* most recently deleted ciphersuites get best positions
 916                                  * for any future CIPHER_ADD (note that the CIPHER_DEL loop
 917                                  * works in reverse to maintain the order) */
 918                                 ll_append_head(&head, curr, &tail);
 919                                 curr->active = 0;
 920                                 }
 921                         }
 922                 else if (rule == CIPHER_KILL)
 923                         {
 924                         /* reverse == 0 */
 925                         if (head == curr)
 926                                 head = curr->next;
 927                         else
 928                                 curr->prev->next = curr->next;
 929                         if (tail == curr)
 930                                 tail = curr->prev;
 931                         curr->active = 0;
 932                         if (curr->next != NULL)
 933                                 curr->next->prev = curr->prev;
 934                         if (curr->prev != NULL)
 935                                 curr->prev->next = curr->next;
 936                         curr->next = NULL;
 937                         curr->prev = NULL;
 938                         }
 939                 }
 940
 941         *head_p = head;
 942         *tail_p = tail;
 943         }
 944
 945 static int ssl_cipher_strength_sort(CIPHER_ORDER **head_p,
 946                                     CIPHER_ORDER **tail_p)
 947         {
 948         int max_strength_bits, i, *number_uses;
 949         CIPHER_ORDER *curr;
 950
 951         /*
 952          * This routine sorts the ciphers with descending strength. The sorting
 953          * must keep the pre-sorted sequence, so we apply the normal sorting
 954          * routine as '+' movement to the end of the list.
 955          */
 956         max_strength_bits = 0;
 957         curr = *head_p;
 958         while (curr != NULL)
 959                 {
 960                 if (curr->active &&
 961                     (curr->cipher->strength_bits > max_strength_bits))
 962                     max_strength_bits = curr->cipher->strength_bits;
 963                 curr = curr->next;
 964                 }
 965
 966         number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
 967         if (!number_uses)
 968                 {
 969                 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
 970                 return(0);
 971                 }
 972         memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
 973
 974         /*
 975          * Now find the strength_bits values actually used
 976          */
 977         curr = *head_p;
 978         while (curr != NULL)
 979                 {
 980                 if (curr->active)
 981                         number_uses[curr->cipher->strength_bits]++;
 982                 curr = curr->next;
 983                 }
 984         /*
 985          * Go through the list of used strength_bits values in descending
 986          * order.
 987          */
 988         for (i = max_strength_bits; i >= 0; i--)
 989                 if (number_uses[i] > 0)
 990                         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p);
 991
 992         OPENSSL_free(number_uses);
 993         return(1);
 994         }
 995
 996 static int ssl_cipher_process_rulestr(const char *rule_str,
 997                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p,
 998                 SSL_CIPHER **ca_list)
 999         {
1000         unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength;
1001         const char *l, *start, *buf;
1002         int j, multi, found, rule, retval, ok, buflen;
1003         unsigned long cipher_id = 0;
1004         char ch;
1005
1006         retval = 1;
1007         l = rule_str;
1008         for (;;)
1009                 {
1010                 ch = *l;
1011
1012                 if (ch == '\0')
1013                         break;          /* done */
1014                 if (ch == '-')
1015                         { rule = CIPHER_DEL; l++; }
1016                 else if (ch == '+')
1017                         { rule = CIPHER_ORD; l++; }
1018                 else if (ch == '!')
1019                         { rule = CIPHER_KILL; l++; }
1020                 else if (ch == '@')
1021                         { rule = CIPHER_SPECIAL; l++; }
1022                 else
1023                         { rule = CIPHER_ADD; }
1024
1025                 if (ITEM_SEP(ch))
1026                         {
1027                         l++;
1028                         continue;
1029                         }
1030
1031                 alg_mkey = 0;
1032                 alg_auth = 0;
1033                 alg_enc = 0;
1034                 alg_mac = 0;
1035                 alg_ssl = 0;
1036                 algo_strength = 0;
1037
1038                 start=l;
1039                 for (;;)
1040                         {
1041                         ch = *l;
1042                         buf = l;
1043                         buflen = 0;
1044 #ifndef CHARSET_EBCDIC
1045                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
1046                                 ((ch >= '0') && (ch <= '9')) ||
1047                                 ((ch >= 'a') && (ch <= 'z')) ||
1048                                  (ch == '-'))
1049 #else
1050                         while ( isalnum(ch) || (ch == '-'))
1051 #endif
1052                                  {
1053                                  ch = *(++l);
1054                                  buflen++;
1055                                  }
1056
1057                         if (buflen == 0)
1058                                 {
1059                                 /*
1060                                  * We hit something we cannot deal with,
1061                                  * it is no command or separator nor
1062                                  * alphanumeric, so we call this an error.
1063                                  */
1064                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1065                                        SSL_R_INVALID_COMMAND);
1066                                 retval = found = 0;
1067                                 l++;
1068                                 break;
1069                                 }
1070
1071                         if (rule == CIPHER_SPECIAL)
1072                                 {
1073                                 found = 0; /* unused -- avoid compiler warning */
1074                                 break;  /* special treatment */
1075                                 }
1076
1077                         /* check for multi-part specification */
1078                         if (ch == '+')
1079                                 {
1080                                 multi=1;
1081                                 l++;
1082                                 }
1083                         else
1084                                 multi=0;
1085
1086                         /*
1087                          * Now search for the cipher alias in the ca_list. Be careful
1088                          * with the strncmp, because the "buflen" limitation
1089                          * will make the rule "ADH:SOME" and the cipher
1090                          * "ADH-MY-CIPHER" look like a match for buflen=3.
1091                          * So additionally check whether the cipher name found
1092                          * has the correct length. We can save a strlen() call:
1093                          * just checking for the '\0' at the right place is
1094                          * sufficient, we have to strncmp() anyway. (We cannot
1095                          * use strcmp(), because buf is not '\0' terminated.)
1096                          */
1097                         j = found = 0;
1098                         cipher_id = 0;
1099                         while (ca_list[j])
1100                                 {
1101                                 if (!strncmp(buf, ca_list[j]->name, buflen) &&
1102                                     (ca_list[j]->name[buflen] == '\0'))
1103                                         {
1104                                         found = 1;
1105                                         break;
1106                                         }
1107                                 else
1108                                         j++;
1109                                 }
1110
1111                         if (!found)
1112                                 break;  /* ignore this entry */
1113
1114                         if (ca_list[j]->algorithm_mkey)
1115                                 {
1116                                 if (alg_mkey)
1117                                         {
1118                                         alg_mkey &= ca_list[j]->algorithm_mkey;
1119                                         if (!alg_mkey) { found = 0; break; }
1120                                         }
1121                                 else
1122                                         alg_mkey = ca_list[j]->algorithm_mkey;
1123                                 }
1124
1125                         if (ca_list[j]->algorithm_auth)
1126                                 {
1127                                 if (alg_auth)
1128                                         {
1129                                         alg_auth &= ca_list[j]->algorithm_auth;
1130                                         if (!alg_auth) { found = 0; break; }
1131                                         }
1132                                 else
1133                                         alg_auth = ca_list[j]->algorithm_auth;
1134                                 }
1135
1136                         if (ca_list[j]->algorithm_enc)
1137                                 {
1138                                 if (alg_enc)
1139                                         {
1140                                         alg_enc &= ca_list[j]->algorithm_enc;
1141                                         if (!alg_enc) { found = 0; break; }
1142                                         }
1143                                 else
1144                                         alg_enc = ca_list[j]->algorithm_enc;
1145                                 }
1146
1147                         if (ca_list[j]->algorithm_mac)
1148                                 {
1149                                 if (alg_mac)
1150                                         {
1151                                         alg_mac &= ca_list[j]->algorithm_mac;
1152                                         if (!alg_mac) { found = 0; break; }
1153                                         }
1154                                 else
1155                                         alg_mac = ca_list[j]->algorithm_mac;
1156                                 }
1157
1158                         if (ca_list[j]->algo_strength & SSL_EXP_MASK)
1159                                 {
1160                                 if (algo_strength & SSL_EXP_MASK)
1161                                         {
1162                                         algo_strength &= (ca_list[j]->algo_strength & SSL_EXP_MASK) | ~SSL_EXP_MASK;
1163                                         if (!(algo_strength & SSL_EXP_MASK)) { found = 0; break; }
1164                                         }
1165                                 else
1166                                         algo_strength |= ca_list[j]->algo_strength & SSL_EXP_MASK;
1167                                 }
1168
1169                         if (ca_list[j]->algo_strength & SSL_STRONG_MASK)
1170                                 {
1171                                 if (algo_strength & SSL_STRONG_MASK)
1172                                         {
1173                                         algo_strength &= (ca_list[j]->algo_strength & SSL_STRONG_MASK) | ~SSL_STRONG_MASK;
1174                                         if (!(algo_strength & SSL_STRONG_MASK)) { found = 0; break; }
1175                                         }
1176                                 else
1177                                         algo_strength |= ca_list[j]->algo_strength & SSL_STRONG_MASK;
1178                                 }
1179
1180                         if (ca_list[j]->valid)
1181                                 {
1182                                 /* explicit ciphersuite found; its protocol version
1183                                  * does not become part of the search pattern!*/
1184
1185                                 cipher_id = ca_list[j]->id;
1186                                 }
1187                         else
1188                                 {
1189                                 /* not an explicit ciphersuite; only in this case, the
1190                                  * protocol version is considered part of the search pattern */
1191
1192                                 if (ca_list[j]->algorithm_ssl)
1193                                         {
1194                                         if (alg_ssl)
1195                                                 {
1196                                                 alg_ssl &= ca_list[j]->algorithm_ssl;
1197                                                 if (!alg_ssl) { found = 0; break; }
1198                                                 }
1199                                         else
1200                                                 alg_ssl = ca_list[j]->algorithm_ssl;
1201                                         }
1202                                 }
1203
1204                         if (!multi) break;
1205                         }
1206
1207                 /*
1208                  * Ok, we have the rule, now apply it
1209                  */
1210                 if (rule == CIPHER_SPECIAL)
1211                         {       /* special command */
1212                         ok = 0;
1213                         if ((buflen == 8) &&
1214                                 !strncmp(buf, "STRENGTH", 8))
1215                                 ok = ssl_cipher_strength_sort(head_p, tail_p);
1216                         else
1217                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1218                                         SSL_R_INVALID_COMMAND);
1219                         if (ok == 0)
1220                                 retval = 0;
1221                         /*
1222                          * We do not support any "multi" options
1223                          * together with "@", so throw away the
1224                          * rest of the command, if any left, until
1225                          * end or ':' is found.
1226                          */
1227                         while ((*l != '\0') && !ITEM_SEP(*l))
1228                                 l++;
1229                         }
1230                 else if (found)
1231                         {
1232                         ssl_cipher_apply_rule(cipher_id,
1233                                 alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength,
1234                                 rule, -1, head_p, tail_p);
1235                         }
1236                 else
1237                         {
1238                         while ((*l != '\0') && !ITEM_SEP(*l))
1239                                 l++;
1240                         }
1241                 if (*l == '\0') break; /* done */
1242                 }
1243
1244         return(retval);
1245         }
1246
1247 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
1248                 STACK_OF(SSL_CIPHER) **cipher_list,
1249                 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
1250                 const char *rule_str)
1251         {
1252         int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
1253         unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl;
1254         STACK_OF(SSL_CIPHER) *cipherstack, *tmp_cipher_list;
1255         const char *rule_p;
1256         CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
1257         SSL_CIPHER **ca_list = NULL;
1258
1259         /*
1260          * Return with error if nothing to do.
1261          */
1262         if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == NULL)
1263                 return NULL;
1264
1265         /*
1266          * To reduce the work to do we only want to process the compiled
1267          * in algorithms, so we first get the mask of disabled ciphers.
1268          */
1269         ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl);
1270
1271         /*
1272          * Now we have to collect the available ciphers from the compiled
1273          * in ciphers. We cannot get more than the number compiled in, so
1274          * it is used for allocation.
1275          */
1276         num_of_ciphers = ssl_method->num_ciphers();
1277 #ifdef KSSL_DEBUG
1278         printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers);
1279 #endif    /* KSSL_DEBUG */
1280         co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
1281         if (co_list == NULL)
1282                 {
1283                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
1284                 return(NULL);   /* Failure */
1285                 }
1286
1287         ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers,
1288                                    disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl,
1289                                    co_list, &head, &tail);
1290
1291
1292         /* Now arrange all ciphers by preference: */
1293
1294         /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */
1295         ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1296         ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1297
1298         /* AES is our preferred symmetric cipher */
1299         ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1300
1301         /* Temporarily enable everything else for sorting */
1302         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1303
1304         /* Low priority for MD5 */
1305         ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail);
1306
1307         /* Move anonymous ciphers to the end.  Usually, these will remain disabled.
1308          * (For applications that allow them, they aren't too bad, but we prefer
1309          * authenticated ciphers.) */
1310         ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1311
1312         /* Move ciphers without forward secrecy to the end */
1313         ssl_cipher_apply_rule(0, 0, SSL_aECDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1314         /* ssl_cipher_apply_rule(0, 0, SSL_aDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); */
1315         ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1316         ssl_cipher_apply_rule(0, SSL_kPSK, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1317         ssl_cipher_apply_rule(0, SSL_kKRB5, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1318
1319         /* RC4 is sort-of broken -- move the the end */
1320         ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1321
1322         /* Now sort by symmetric encryption strength.  The above ordering remains
1323          * in force within each class */
1324         if (!ssl_cipher_strength_sort(&head, &tail))
1325                 {
1326                 OPENSSL_free(co_list);
1327                 return NULL;
1328                 }
1329
1330         /* Now disable everything (maintaining the ordering!) */
1331         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1332
1333
1334         /*
1335          * We also need cipher aliases for selecting based on the rule_str.
1336          * There might be two types of entries in the rule_str: 1) names
1337          * of ciphers themselves 2) aliases for groups of ciphers.
1338          * For 1) we need the available ciphers and for 2) the cipher
1339          * groups of cipher_aliases added together in one list (otherwise
1340          * we would be happy with just the cipher_aliases table).
1341          */
1342         num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
1343         num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
1344         ca_list =
1345                 (SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
1346         if (ca_list == NULL)
1347                 {
1348                 OPENSSL_free(co_list);
1349                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
1350                 return(NULL);   /* Failure */
1351                 }
1352         ssl_cipher_collect_aliases(ca_list, num_of_group_aliases,
1353                                    disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl,
1354                                    head);
1355
1356         /*
1357          * If the rule_string begins with DEFAULT, apply the default rule
1358          * before using the (possibly available) additional rules.
1359          */
1360         ok = 1;
1361         rule_p = rule_str;
1362         if (strncmp(rule_str,"DEFAULT",7) == 0)
1363                 {
1364                 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
1365                         &head, &tail, ca_list);
1366                 rule_p += 7;
1367                 if (*rule_p == ':')
1368                         rule_p++;
1369                 }
1370
1371         if (ok && (strlen(rule_p) > 0))
1372                 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list);
1373
1374         OPENSSL_free(ca_list);  /* Not needed anymore */
1375
1376         if (!ok)
1377                 {       /* Rule processing failure */
1378                 OPENSSL_free(co_list);
1379                 return(NULL);
1380                 }
1381
1382         /*
1383          * Allocate new "cipherstack" for the result, return with error
1384          * if we cannot get one.
1385          */
1386         if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
1387                 {
1388                 OPENSSL_free(co_list);
1389                 return(NULL);
1390                 }
1391
1392         /*
1393          * The cipher selection for the list is done. The ciphers are added
1394          * to the resulting precedence to the STACK_OF(SSL_CIPHER).
1395          */
1396         for (curr = head; curr != NULL; curr = curr->next)
1397                 {
1398                 if (curr->active)
1399                         {
1400                         sk_SSL_CIPHER_push(cipherstack, curr->cipher);
1401 #ifdef CIPHER_DEBUG
1402                         printf("<%s>\n",curr->cipher->name);
1403 #endif
1404                         }
1405                 }
1406         OPENSSL_free(co_list);  /* Not needed any longer */
1407
1408         tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack);
1409         if (tmp_cipher_list == NULL)
1410                 {
1411                 sk_SSL_CIPHER_free(cipherstack);
1412                 return NULL;
1413                 }
1414         if (*cipher_list != NULL)
1415                 sk_SSL_CIPHER_free(*cipher_list);
1416         *cipher_list = cipherstack;
1417         if (*cipher_list_by_id != NULL)
1418                 sk_SSL_CIPHER_free(*cipher_list_by_id);
1419         *cipher_list_by_id = tmp_cipher_list;
1420         (void)sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
1421
1422         return(cipherstack);
1423         }
1424
1425 char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
1426         {
1427         int is_export,pkl,kl;
1428         const char *ver,*exp_str;
1429         const char *kx,*au,*enc,*mac;
1430         unsigned long alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl,alg2,alg_s;
1431 #ifdef KSSL_DEBUG
1432         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx/%lx/%lx/%lx/%lx\n";
1433 #else
1434         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
1435 #endif /* KSSL_DEBUG */
1436
1437         alg_mkey = cipher->algorithm_mkey;
1438         alg_auth = cipher->algorithm_auth;
1439         alg_enc = cipher->algorithm_enc;
1440         alg_mac = cipher->algorithm_mac;
1441         alg_ssl = cipher->algorithm_ssl;
1442
1443         alg_s=cipher->algo_strength;
1444         alg2=cipher->algorithm2;
1445
1446         is_export=SSL_C_IS_EXPORT(cipher);
1447         pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
1448         kl=SSL_C_EXPORT_KEYLENGTH(cipher);
1449         exp_str=is_export?" export":"";
1450
1451         if (alg_ssl & SSL_SSLV2)
1452                 ver="SSLv2";
1453         else if (alg_ssl & SSL_SSLV3)
1454                 ver="SSLv3";
1455         else
1456                 ver="unknown";
1457
1458         switch (alg_mkey)
1459                 {
1460         case SSL_kRSA:
1461                 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
1462                 break;
1463         case SSL_kDHr:
1464                 kx="DH/RSA";
1465                 break;
1466         case SSL_kDHd:
1467                 kx="DH/DSS";
1468                 break;
1469         case SSL_kKRB5:
1470                 kx="KRB5";
1471                 break;
1472         case SSL_kEDH:
1473                 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
1474                 break;
1475         case SSL_kECDHr:
1476                 kx="ECDH/RSA";
1477                 break;
1478         case SSL_kECDHe:
1479                 kx="ECDH/ECDSA";
1480                 break;
1481         case SSL_kEECDH:
1482                 kx="ECDH";
1483                 break;
1484         case SSL_kPSK:
1485                 kx="PSK";
1486                 break;
1487         default:
1488                 kx="unknown";
1489                 }
1490
1491         switch (alg_auth)
1492                 {
1493         case SSL_aRSA:
1494                 au="RSA";
1495                 break;
1496         case SSL_aDSS:
1497                 au="DSS";
1498                 break;
1499         case SSL_aDH:
1500                 au="DH";
1501                 break;
1502         case SSL_aKRB5:
1503                 au="KRB5";
1504                 break;
1505         case SSL_aECDH:
1506                 au="ECDH";
1507                 break;
1508         case SSL_aNULL:
1509                 au="None";
1510                 break;
1511         case SSL_aECDSA:
1512                 au="ECDSA";
1513                 break;
1514         case SSL_aPSK:
1515                 au="PSK";
1516                 break;
1517         default:
1518                 au="unknown";
1519                 break;
1520                 }
1521
1522         switch (alg_enc)
1523                 {
1524         case SSL_DES:
1525                 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
1526                 break;
1527         case SSL_3DES:
1528                 enc="3DES(168)";
1529                 break;
1530         case SSL_RC4:
1531                 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
1532                   :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
1533                 break;
1534         case SSL_RC2:
1535                 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
1536                 break;
1537         case SSL_IDEA:
1538                 enc="IDEA(128)";
1539                 break;
1540         case SSL_eNULL:
1541                 enc="None";
1542                 break;
1543         case SSL_AES128:
1544                 enc="AES(128)";
1545                 break;
1546         case SSL_AES256:
1547                 enc="AES(256)";
1548                 break;
1549         case SSL_CAMELLIA128:
1550                 enc="Camellia(128)";
1551                 break;
1552         case SSL_CAMELLIA256:
1553                 enc="Camellia(256)";
1554                 break;
1555         case SSL_SEED:
1556                 enc="SEED(128)";
1557                 break;
1558         default:
1559                 enc="unknown";
1560                 break;
1561                 }
1562
1563         switch (alg_mac)
1564                 {
1565         case SSL_MD5:
1566                 mac="MD5";
1567                 break;
1568         case SSL_SHA1:
1569                 mac="SHA1";
1570                 break;
1571         default:
1572                 mac="unknown";
1573                 break;
1574                 }
1575
1576         if (buf == NULL)
1577                 {
1578                 len=128;
1579                 buf=OPENSSL_malloc(len);
1580                 if (buf == NULL) return("OPENSSL_malloc Error");
1581                 }
1582         else if (len < 128)
1583                 return("Buffer too small");
1584
1585 #ifdef KSSL_DEBUG
1586         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl);
1587 #else
1588         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str);
1589 #endif /* KSSL_DEBUG */
1590         return(buf);
1591         }
1592
1593 char *SSL_CIPHER_get_version(const SSL_CIPHER *c)
1594         {
1595         int i;
1596
1597         if (c == NULL) return("(NONE)");
1598         i=(int)(c->id>>24L);
1599         if (i == 3)
1600                 return("TLSv1/SSLv3");
1601         else if (i == 2)
1602                 return("SSLv2");
1603         else
1604                 return("unknown");
1605         }
1606
1607 /* return the actual cipher being used */
1608 const char *SSL_CIPHER_get_name(const SSL_CIPHER *c)
1609         {
1610         if (c != NULL)
1611                 return(c->name);
1612         return("(NONE)");
1613         }
1614
1615 /* number of bits for symmetric cipher */
1616 int SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
1617         {
1618         int ret=0;
1619
1620         if (c != NULL)
1621                 {
1622                 if (alg_bits != NULL) *alg_bits = c->alg_bits;
1623                 ret = c->strength_bits;
1624                 }
1625         return(ret);
1626         }
1627
1628 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
1629         {
1630         SSL_COMP *ctmp;
1631         int i,nn;
1632
1633         if ((n == 0) || (sk == NULL)) return(NULL);
1634         nn=sk_SSL_COMP_num(sk);
1635         for (i=0; i<nn; i++)
1636                 {
1637                 ctmp=sk_SSL_COMP_value(sk,i);
1638                 if (ctmp->id == n)
1639                         return(ctmp);
1640                 }
1641         return(NULL);
1642         }
1643
1644 #ifdef OPENSSL_NO_COMP
1645 void *SSL_COMP_get_compression_methods(void)
1646         {
1647         return NULL;
1648         }
1649 int SSL_COMP_add_compression_method(int id, void *cm)
1650         {
1651         return 1;
1652         }
1653
1654 const char *SSL_COMP_get_name(const void *comp)
1655         {
1656         return NULL;
1657         }
1658 #else
1659 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
1660         {
1661         load_builtin_compressions();
1662         return(ssl_comp_methods);
1663         }
1664
1665 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
1666         {
1667         SSL_COMP *comp;
1668
1669         if (cm == NULL || cm->type == NID_undef)
1670                 return 1;
1671
1672         /* According to draft-ietf-tls-compression-04.txt, the
1673            compression number ranges should be the following:
1674
1675            0 to 63:    methods defined by the IETF
1676            64 to 192:  external party methods assigned by IANA
1677            193 to 255: reserved for private use */
1678         if (id < 193 || id > 255)
1679                 {
1680                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_COMPRESSION_ID_NOT_WITHIN_PRIVATE_RANGE);
1681                 return 0;
1682                 }
1683
1684         MemCheck_off();
1685         comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
1686         comp->id=id;
1687         comp->method=cm;
1688         load_builtin_compressions();
1689         if (ssl_comp_methods
1690                 && !sk_SSL_COMP_find(ssl_comp_methods,comp))
1691                 {
1692                 OPENSSL_free(comp);
1693                 MemCheck_on();
1694                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_DUPLICATE_COMPRESSION_ID);
1695                 return(1);
1696                 }
1697         else if ((ssl_comp_methods == NULL)
1698                 || !sk_SSL_COMP_push(ssl_comp_methods,comp))
1699                 {
1700                 OPENSSL_free(comp);
1701                 MemCheck_on();
1702                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
1703                 return(1);
1704                 }
1705         else
1706                 {
1707                 MemCheck_on();
1708                 return(0);
1709                 }
1710         }
1711
1712 const char *SSL_COMP_get_name(const COMP_METHOD *comp)
1713         {
1714         if (comp)
1715                 return comp->name;
1716         return NULL;
1717         }
1718
1719 #endif