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 #ifndef OPENSSL_NO_ENGINE
 147 #include <openssl/engine.h>
 148 #endif
 149 #include "ssl_locl.h"
 150
 151 #define SSL_ENC_DES_IDX         0
 152 #define SSL_ENC_3DES_IDX        1
 153 #define SSL_ENC_RC4_IDX         2
 154 #define SSL_ENC_RC2_IDX         3
 155 #define SSL_ENC_IDEA_IDX        4
 156 #define SSL_ENC_NULL_IDX        5
 157 #define SSL_ENC_AES128_IDX      6
 158 #define SSL_ENC_AES256_IDX      7
 159 #define SSL_ENC_CAMELLIA128_IDX 8
 160 #define SSL_ENC_CAMELLIA256_IDX 9
 161 #define SSL_ENC_GOST89_IDX      10
 162 #define SSL_ENC_SEED_IDX        11
 163 #define SSL_ENC_NUM_IDX         12
 164
 165
 166 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
 167         NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
 168         };
 169
 170 #define SSL_COMP_NULL_IDX       0
 171 #define SSL_COMP_ZLIB_IDX       1
 172 #define SSL_COMP_NUM_IDX        2
 173
 174 static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
 175
 176 #define SSL_MD_MD5_IDX  0
 177 #define SSL_MD_SHA1_IDX 1
 178 #define SSL_MD_GOST94_IDX 2
 179 #define SSL_MD_GOST89MAC_IDX 3
 180 /*Constant SSL_MAX_DIGEST equal to size of digests array should be
 181  * defined in the
 182  * ssl_locl.h */
 183 #define SSL_MD_NUM_IDX  SSL_MAX_DIGEST
 184 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
 185         NULL,NULL,NULL,NULL
 186         };
 187 /* PKEY_TYPE for GOST89MAC is known in advance, but, because
 188  * implementation is engine-provided, we'll fill it only if
 189  * corresponding EVP_PKEY_METHOD is found
 190  */
 191 static int  ssl_mac_pkey_id[SSL_MD_NUM_IDX]={
 192         EVP_PKEY_HMAC,EVP_PKEY_HMAC,EVP_PKEY_HMAC,NID_undef
 193         };
 194
 195 static int ssl_mac_secret_size[SSL_MD_NUM_IDX]={
 196         0,0,0,0
 197         };
 198
 199 static int ssl_handshake_digest_flag[SSL_MD_NUM_IDX]={
 200         SSL_HANDSHAKE_MAC_MD5,SSL_HANDSHAKE_MAC_SHA,
 201         SSL_HANDSHAKE_MAC_GOST94,0
 202         };
 203
 204 #define CIPHER_ADD      1
 205 #define CIPHER_KILL     2
 206 #define CIPHER_DEL      3
 207 #define CIPHER_ORD      4
 208 #define CIPHER_SPECIAL  5
 209
 210 typedef struct cipher_order_st
 211         {
 212         const SSL_CIPHER *cipher;
 213         int active;
 214         int dead;
 215         struct cipher_order_st *next,*prev;
 216         } CIPHER_ORDER;
 217
 218 static const SSL_CIPHER cipher_aliases[]={
 219         /* "ALL" doesn't include eNULL (must be specifically enabled) */
 220         {0,SSL_TXT_ALL,0,     0,0,~SSL_eNULL,0,0,0,0,0,0},
 221         /* "COMPLEMENTOFALL" */
 222         {0,SSL_TXT_CMPALL,0,  0,0,SSL_eNULL,0,0,0,0,0,0},
 223
 224         /* "COMPLEMENTOFDEFAULT" (does *not* include ciphersuites not found in ALL!) */
 225         {0,SSL_TXT_CMPDEF,0,  SSL_kEDH|SSL_kEECDH,SSL_aNULL,~SSL_eNULL,0,0,0,0,0,0},
 226
 227         /* key exchange aliases
 228          * (some of those using only a single bit here combine
 229          * multiple key exchange algs according to the RFCs,
 230          * e.g. kEDH combines DHE_DSS and DHE_RSA) */
 231         {0,SSL_TXT_kRSA,0,    SSL_kRSA,  0,0,0,0,0,0,0,0},
 232
 233         {0,SSL_TXT_kDHr,0,    SSL_kDHr,  0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 234         {0,SSL_TXT_kDHd,0,    SSL_kDHd,  0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 235         {0,SSL_TXT_kDH,0,     SSL_kDHr|SSL_kDHd,0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 236         {0,SSL_TXT_kEDH,0,    SSL_kEDH,  0,0,0,0,0,0,0,0},
 237         {0,SSL_TXT_DH,0,      SSL_kDHr|SSL_kDHd|SSL_kEDH,0,0,0,0,0,0,0,0},
 238
 239         {0,SSL_TXT_kKRB5,0,   SSL_kKRB5, 0,0,0,0,0,0,0,0},
 240
 241         {0,SSL_TXT_kECDHr,0,  SSL_kECDHr,0,0,0,0,0,0,0,0},
 242         {0,SSL_TXT_kECDHe,0,  SSL_kECDHe,0,0,0,0,0,0,0,0},
 243         {0,SSL_TXT_kECDH,0,   SSL_kECDHr|SSL_kECDHe,0,0,0,0,0,0,0,0},
 244         {0,SSL_TXT_kEECDH,0,  SSL_kEECDH,0,0,0,0,0,0,0,0},
 245         {0,SSL_TXT_ECDH,0,    SSL_kECDHr|SSL_kECDHe|SSL_kEECDH,0,0,0,0,0,0,0,0},
 246
 247         {0,SSL_TXT_kPSK,0,    SSL_kPSK,  0,0,0,0,0,0,0,0},
 248         {0,SSL_TXT_kGOST,0, SSL_kGOST,0,0,0,0,0,0,0,0},
 249
 250         /* server authentication aliases */
 251         {0,SSL_TXT_aRSA,0,    0,SSL_aRSA,  0,0,0,0,0,0,0},
 252         {0,SSL_TXT_aDSS,0,    0,SSL_aDSS,  0,0,0,0,0,0,0},
 253         {0,SSL_TXT_DSS,0,     0,SSL_aDSS,   0,0,0,0,0,0,0},
 254         {0,SSL_TXT_aKRB5,0,   0,SSL_aKRB5, 0,0,0,0,0,0,0},
 255         {0,SSL_TXT_aNULL,0,   0,SSL_aNULL, 0,0,0,0,0,0,0},
 256         {0,SSL_TXT_aDH,0,     0,SSL_aDH,   0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
 257         {0,SSL_TXT_aECDH,0,   0,SSL_aECDH, 0,0,0,0,0,0,0},
 258         {0,SSL_TXT_aECDSA,0,  0,SSL_aECDSA,0,0,0,0,0,0,0},
 259         {0,SSL_TXT_ECDSA,0,   0,SSL_aECDSA, 0,0,0,0,0,0,0},
 260         {0,SSL_TXT_aPSK,0,    0,SSL_aPSK,  0,0,0,0,0,0,0},
 261         {0,SSL_TXT_aGOST94,0,0,SSL_aGOST94,0,0,0,0,0,0,0},
 262         {0,SSL_TXT_aGOST01,0,0,SSL_aGOST01,0,0,0,0,0,0,0},
 263         {0,SSL_TXT_aGOST,0,0,SSL_aGOST94|SSL_aGOST01,0,0,0,0,0,0,0},
 264
 265         /* aliases combining key exchange and server authentication */
 266         {0,SSL_TXT_EDH,0,     SSL_kEDH,~SSL_aNULL,0,0,0,0,0,0,0},
 267         {0,SSL_TXT_EECDH,0,   SSL_kEECDH,~SSL_aNULL,0,0,0,0,0,0,0},
 268         {0,SSL_TXT_NULL,0,    0,0,SSL_eNULL, 0,0,0,0,0,0},
 269         {0,SSL_TXT_KRB5,0,    SSL_kKRB5,SSL_aKRB5,0,0,0,0,0,0,0},
 270         {0,SSL_TXT_RSA,0,     SSL_kRSA,SSL_aRSA,0,0,0,0,0,0,0},
 271         {0,SSL_TXT_ADH,0,     SSL_kEDH,SSL_aNULL,0,0,0,0,0,0,0},
 272         {0,SSL_TXT_AECDH,0,   SSL_kEECDH,SSL_aNULL,0,0,0,0,0,0,0},
 273         {0,SSL_TXT_PSK,0,     SSL_kPSK,SSL_aPSK,0,0,0,0,0,0,0},
 274
 275
 276         /* symmetric encryption aliases */
 277         {0,SSL_TXT_DES,0,     0,0,SSL_DES,   0,0,0,0,0,0},
 278         {0,SSL_TXT_3DES,0,    0,0,SSL_3DES,  0,0,0,0,0,0},
 279         {0,SSL_TXT_RC4,0,     0,0,SSL_RC4,   0,0,0,0,0,0},
 280         {0,SSL_TXT_RC2,0,     0,0,SSL_RC2,   0,0,0,0,0,0},
 281         {0,SSL_TXT_IDEA,0,    0,0,SSL_IDEA,  0,0,0,0,0,0},
 282         {0,SSL_TXT_SEED,0,    0,0,SSL_SEED,  0,0,0,0,0,0},
 283         {0,SSL_TXT_eNULL,0,   0,0,SSL_eNULL, 0,0,0,0,0,0},
 284         {0,SSL_TXT_AES128,0,  0,0,SSL_AES128,0,0,0,0,0,0},
 285         {0,SSL_TXT_AES256,0,  0,0,SSL_AES256,0,0,0,0,0,0},
 286         {0,SSL_TXT_AES,0,     0,0,SSL_AES128|SSL_AES256,0,0,0,0,0,0},
 287         {0,SSL_TXT_CAMELLIA128,0,0,0,SSL_CAMELLIA128,0,0,0,0,0,0},
 288         {0,SSL_TXT_CAMELLIA256,0,0,0,SSL_CAMELLIA256,0,0,0,0,0,0},
 289         {0,SSL_TXT_CAMELLIA   ,0,0,0,SSL_CAMELLIA128|SSL_CAMELLIA256,0,0,0,0,0,0},
 290
 291         /* MAC aliases */
 292         {0,SSL_TXT_MD5,0,     0,0,0,SSL_MD5,   0,0,0,0,0},
 293         {0,SSL_TXT_SHA1,0,    0,0,0,SSL_SHA1,  0,0,0,0,0},
 294         {0,SSL_TXT_SHA,0,     0,0,0,SSL_SHA1,  0,0,0,0,0},
 295         {0,SSL_TXT_GOST94,0,     0,0,0,SSL_GOST94,  0,0,0,0,0},
 296         {0,SSL_TXT_GOST89MAC,0,     0,0,0,SSL_GOST89MAC,  0,0,0,0,0},
 297
 298         /* protocol version aliases */
 299         {0,SSL_TXT_SSLV2,0,   0,0,0,0,SSL_SSLV2, 0,0,0,0},
 300         {0,SSL_TXT_SSLV3,0,   0,0,0,0,SSL_SSLV3, 0,0,0,0},
 301         {0,SSL_TXT_TLSV1,0,   0,0,0,0,SSL_TLSV1, 0,0,0,0},
 302
 303         /* export flag */
 304         {0,SSL_TXT_EXP,0,     0,0,0,0,0,SSL_EXPORT,0,0,0},
 305         {0,SSL_TXT_EXPORT,0,  0,0,0,0,0,SSL_EXPORT,0,0,0},
 306
 307         /* strength classes */
 308         {0,SSL_TXT_EXP40,0,   0,0,0,0,0,SSL_EXP40, 0,0,0},
 309         {0,SSL_TXT_EXP56,0,   0,0,0,0,0,SSL_EXP56, 0,0,0},
 310         {0,SSL_TXT_LOW,0,     0,0,0,0,0,SSL_LOW,   0,0,0},
 311         {0,SSL_TXT_MEDIUM,0,  0,0,0,0,0,SSL_MEDIUM,0,0,0},
 312         {0,SSL_TXT_HIGH,0,    0,0,0,0,0,SSL_HIGH,  0,0,0},
 313         /* FIPS 140-2 approved ciphersuite */
 314         {0,SSL_TXT_FIPS,0,    0,0,~SSL_eNULL,0,0,SSL_FIPS,  0,0,0},
 315         };
 316 /* Search for public key algorithm with given name and
 317  * return its pkey_id if it is available. Otherwise return 0
 318  */
 319 #ifdef OPENSSL_NO_ENGINE
 320
 321 static int get_optional_pkey_id(const char *pkey_name)
 322         {
 323         const EVP_PKEY_ASN1_METHOD *ameth;
 324         int pkey_id=0;
 325         ameth = EVP_PKEY_asn1_find_str(NULL,pkey_name,-1);
 326         if (ameth)
 327                 {
 328                 EVP_PKEY_asn1_get0_info(&pkey_id, NULL,NULL,NULL,NULL,ameth);
 329                 }
 330         return pkey_id;
 331         }
 332
 333 #else
 334
 335 static int get_optional_pkey_id(const char *pkey_name)
 336         {
 337         const EVP_PKEY_ASN1_METHOD *ameth;
 338         ENGINE *tmpeng = NULL;
 339         int pkey_id=0;
 340         ameth = EVP_PKEY_asn1_find_str(&tmpeng,pkey_name,-1);
 341         if (ameth)
 342                 {
 343                 EVP_PKEY_asn1_get0_info(&pkey_id, NULL,NULL,NULL,NULL,ameth);
 344                 }
 345         if (tmpeng) ENGINE_finish(tmpeng);
 346         return pkey_id;
 347         }
 348
 349 #endif
 350
 351 void ssl_load_ciphers(void)
 352         {
 353         ssl_cipher_methods[SSL_ENC_DES_IDX]=
 354                 EVP_get_cipherbyname(SN_des_cbc);
 355         ssl_cipher_methods[SSL_ENC_3DES_IDX]=
 356                 EVP_get_cipherbyname(SN_des_ede3_cbc);
 357         ssl_cipher_methods[SSL_ENC_RC4_IDX]=
 358                 EVP_get_cipherbyname(SN_rc4);
 359         ssl_cipher_methods[SSL_ENC_RC2_IDX]=
 360                 EVP_get_cipherbyname(SN_rc2_cbc);
 361 #ifndef OPENSSL_NO_IDEA
 362         ssl_cipher_methods[SSL_ENC_IDEA_IDX]=
 363                 EVP_get_cipherbyname(SN_idea_cbc);
 364 #else
 365         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= NULL;
 366 #endif
 367         ssl_cipher_methods[SSL_ENC_AES128_IDX]=
 368           EVP_get_cipherbyname(SN_aes_128_cbc);
 369         ssl_cipher_methods[SSL_ENC_AES256_IDX]=
 370           EVP_get_cipherbyname(SN_aes_256_cbc);
 371         ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX]=
 372           EVP_get_cipherbyname(SN_camellia_128_cbc);
 373         ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX]=
 374           EVP_get_cipherbyname(SN_camellia_256_cbc);
 375         ssl_cipher_methods[SSL_ENC_GOST89_IDX]=
 376           EVP_get_cipherbyname(SN_gost89_cnt);
 377         ssl_cipher_methods[SSL_ENC_SEED_IDX]=
 378           EVP_get_cipherbyname(SN_seed_cbc);
 379
 380         ssl_digest_methods[SSL_MD_MD5_IDX]=
 381                 EVP_get_digestbyname(SN_md5);
 382         ssl_mac_secret_size[SSL_MD_MD5_IDX]=
 383                 EVP_MD_size(ssl_digest_methods[SSL_MD_MD5_IDX]);
 384         OPENSSL_assert(ssl_mac_secret_size[SSL_MD_MD5_IDX] >= 0);
 385         ssl_digest_methods[SSL_MD_SHA1_IDX]=
 386                 EVP_get_digestbyname(SN_sha1);
 387         ssl_mac_secret_size[SSL_MD_SHA1_IDX]=
 388                 EVP_MD_size(ssl_digest_methods[SSL_MD_SHA1_IDX]);
 389         OPENSSL_assert(ssl_mac_secret_size[SSL_MD_SHA1_IDX] >= 0);
 390         ssl_digest_methods[SSL_MD_GOST94_IDX]=
 391                 EVP_get_digestbyname(SN_id_GostR3411_94);
 392         if (ssl_digest_methods[SSL_MD_GOST94_IDX])
 393                 {
 394                 ssl_mac_secret_size[SSL_MD_GOST94_IDX]=
 395                         EVP_MD_size(ssl_digest_methods[SSL_MD_GOST94_IDX]);
 396                 OPENSSL_assert(ssl_mac_secret_size[SSL_MD_GOST94_IDX] >= 0);
 397                 }
 398         ssl_digest_methods[SSL_MD_GOST89MAC_IDX]=
 399                 EVP_get_digestbyname(SN_id_Gost28147_89_MAC);
 400                 ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX] = get_optional_pkey_id("gost-mac");
 401                 if (ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX]) {
 402                         ssl_mac_secret_size[SSL_MD_GOST89MAC_IDX]=32;
 403                 }
 404
 405         }
 406 #ifndef OPENSSL_NO_COMP
 407
 408 static int sk_comp_cmp(const SSL_COMP * const *a,
 409                         const SSL_COMP * const *b)
 410         {
 411         return((*a)->id-(*b)->id);
 412         }
 413
 414 static void load_builtin_compressions(void)
 415         {
 416         int got_write_lock = 0;
 417
 418         CRYPTO_r_lock(CRYPTO_LOCK_SSL);
 419         if (ssl_comp_methods == NULL)
 420                 {
 421                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
 422                 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
 423                 got_write_lock = 1;
 424
 425                 if (ssl_comp_methods == NULL)
 426                         {
 427                         SSL_COMP *comp = NULL;
 428
 429                         MemCheck_off();
 430                         ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
 431                         if (ssl_comp_methods != NULL)
 432                                 {
 433                                 comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
 434                                 if (comp != NULL)
 435                                         {
 436                                         comp->method=COMP_zlib();
 437                                         if (comp->method
 438                                                 && comp->method->type == NID_undef)
 439                                                 OPENSSL_free(comp);
 440                                         else
 441                                                 {
 442                                                 comp->id=SSL_COMP_ZLIB_IDX;
 443                                                 comp->name=comp->method->name;
 444                                                 sk_SSL_COMP_push(ssl_comp_methods,comp);
 445                                                 }
 446                                         }
 447                                 }
 448                         MemCheck_on();
 449                         }
 450                 }
 451
 452         if (got_write_lock)
 453                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
 454         else
 455                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
 456         }
 457 #endif
 458
 459 int ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc,
 460              const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size,SSL_COMP **comp)
 461         {
 462         int i;
 463         const SSL_CIPHER *c;
 464
 465         c=s->cipher;
 466         if (c == NULL) return(0);
 467         if (comp != NULL)
 468                 {
 469                 SSL_COMP ctmp;
 470 #ifndef OPENSSL_NO_COMP
 471                 load_builtin_compressions();
 472 #endif
 473
 474                 *comp=NULL;
 475                 ctmp.id=s->compress_meth;
 476                 if (ssl_comp_methods != NULL)
 477                         {
 478                         i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
 479                         if (i >= 0)
 480                                 *comp=sk_SSL_COMP_value(ssl_comp_methods,i);
 481                         else
 482                                 *comp=NULL;
 483                         }
 484                 }
 485
 486         if ((enc == NULL) || (md == NULL)) return(0);
 487
 488         switch (c->algorithm_enc)
 489                 {
 490         case SSL_DES:
 491                 i=SSL_ENC_DES_IDX;
 492                 break;
 493         case SSL_3DES:
 494                 i=SSL_ENC_3DES_IDX;
 495                 break;
 496         case SSL_RC4:
 497                 i=SSL_ENC_RC4_IDX;
 498                 break;
 499         case SSL_RC2:
 500                 i=SSL_ENC_RC2_IDX;
 501                 break;
 502         case SSL_IDEA:
 503                 i=SSL_ENC_IDEA_IDX;
 504                 break;
 505         case SSL_eNULL:
 506                 i=SSL_ENC_NULL_IDX;
 507                 break;
 508         case SSL_AES128:
 509                 i=SSL_ENC_AES128_IDX;
 510                 break;
 511         case SSL_AES256:
 512                 i=SSL_ENC_AES256_IDX;
 513                 break;
 514         case SSL_CAMELLIA128:
 515                 i=SSL_ENC_CAMELLIA128_IDX;
 516                 break;
 517         case SSL_CAMELLIA256:
 518                 i=SSL_ENC_CAMELLIA256_IDX;
 519                 break;
 520         case SSL_eGOST2814789CNT:
 521                 i=SSL_ENC_GOST89_IDX;
 522                 break;
 523         case SSL_SEED:
 524                 i=SSL_ENC_SEED_IDX;
 525                 break;
 526         default:
 527                 i= -1;
 528                 break;
 529                 }
 530
 531         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
 532                 *enc=NULL;
 533         else
 534                 {
 535                 if (i == SSL_ENC_NULL_IDX)
 536                         *enc=EVP_enc_null();
 537                 else
 538                         *enc=ssl_cipher_methods[i];
 539                 }
 540
 541         switch (c->algorithm_mac)
 542                 {
 543         case SSL_MD5:
 544                 i=SSL_MD_MD5_IDX;
 545                 break;
 546         case SSL_SHA1:
 547                 i=SSL_MD_SHA1_IDX;
 548                 break;
 549         case SSL_GOST94:
 550                 i = SSL_MD_GOST94_IDX;
 551                 break;
 552         case SSL_GOST89MAC:
 553                 i = SSL_MD_GOST89MAC_IDX;
 554                 break;
 555         default:
 556                 i= -1;
 557                 break;
 558                 }
 559         if ((i < 0) || (i > SSL_MD_NUM_IDX))
 560         {
 561                 *md=NULL;
 562                 if (mac_pkey_type!=NULL) *mac_pkey_type = NID_undef;
 563                 if (mac_secret_size!=NULL) *mac_secret_size = 0;
 564
 565         }
 566         else
 567         {
 568                 *md=ssl_digest_methods[i];
 569                 if (mac_pkey_type!=NULL) *mac_pkey_type = ssl_mac_pkey_id[i];
 570                 if (mac_secret_size!=NULL) *mac_secret_size = ssl_mac_secret_size[i];
 571         }
 572
 573         if ((*enc != NULL) && (*md != NULL) && (!mac_pkey_type||*mac_pkey_type != NID_undef))
 574                 return(1);
 575         else
 576                 return(0);
 577         }
 578
 579 int ssl_get_handshake_digest(int idx, long *mask, const EVP_MD **md)
 580 {
 581         if (idx <0||idx>=SSL_MD_NUM_IDX)
 582                 {
 583                 return 0;
 584                 }
 585         if (ssl_handshake_digest_flag[idx]==0) return 0;
 586         *mask = ssl_handshake_digest_flag[idx];
 587         *md = ssl_digest_methods[idx];
 588         return 1;
 589 }
 590
 591 #define ITEM_SEP(a) \
 592         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
 593
 594 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
 595              CIPHER_ORDER **tail)
 596         {
 597         if (curr == *tail) return;
 598         if (curr == *head)
 599                 *head=curr->next;
 600         if (curr->prev != NULL)
 601                 curr->prev->next=curr->next;
 602         if (curr->next != NULL)
 603                 curr->next->prev=curr->prev;
 604         (*tail)->next=curr;
 605         curr->prev= *tail;
 606         curr->next=NULL;
 607         *tail=curr;
 608         }
 609
 610 static void ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr,
 611              CIPHER_ORDER **tail)
 612         {
 613         if (curr == *head) return;
 614         if (curr == *tail)
 615                 *tail=curr->prev;
 616         if (curr->next != NULL)
 617                 curr->next->prev=curr->prev;
 618         if (curr->prev != NULL)
 619                 curr->prev->next=curr->next;
 620         (*head)->prev=curr;
 621         curr->next= *head;
 622         curr->prev=NULL;
 623         *head=curr;
 624         }
 625
 626 static void ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth, unsigned long *enc, unsigned long *mac, unsigned long *ssl)
 627         {
 628         *mkey = 0;
 629         *auth = 0;
 630         *enc = 0;
 631         *mac = 0;
 632         *ssl = 0;
 633
 634 #ifdef OPENSSL_NO_RSA
 635         *mkey |= SSL_kRSA;
 636         *auth |= SSL_aRSA;
 637 #endif
 638 #ifdef OPENSSL_NO_DSA
 639         *auth |= SSL_aDSS;
 640 #endif
 641         *mkey |= SSL_kDHr|SSL_kDHd; /* no such ciphersuites supported! */
 642         *auth |= SSL_aDH;
 643 #ifdef OPENSSL_NO_DH
 644         *mkey |= SSL_kDHr|SSL_kDHd|SSL_kEDH;
 645         *auth |= SSL_aDH;
 646 #endif
 647 #ifdef OPENSSL_NO_KRB5
 648         *mkey |= SSL_kKRB5;
 649         *auth |= SSL_aKRB5;
 650 #endif
 651 #ifdef OPENSSL_NO_ECDSA
 652         *auth |= SSL_aECDSA;
 653 #endif
 654 #ifdef OPENSSL_NO_ECDH
 655         *mkey |= SSL_kECDHe|SSL_kECDHr;
 656         *auth |= SSL_aECDH;
 657 #endif
 658 #ifdef OPENSSL_NO_PSK
 659         *mkey |= SSL_kPSK;
 660         *auth |= SSL_aPSK;
 661 #endif
 662         /* Check for presence of GOST 34.10 algorithms, and if they
 663          * do not present, disable  appropriate auth and key exchange */
 664         if (!get_optional_pkey_id("gost94")) {
 665                 *auth |= SSL_aGOST94;
 666         }
 667         if (!get_optional_pkey_id("gost2001")) {
 668                 *auth |= SSL_aGOST01;
 669         }
 670         /* Disable GOST key exchange if no GOST signature algs are available * */
 671         if ((*auth & (SSL_aGOST94|SSL_aGOST01)) == (SSL_aGOST94|SSL_aGOST01)) {
 672                 *mkey |= SSL_kGOST;
 673         }
 674 #ifdef SSL_FORBID_ENULL
 675         *enc |= SSL_eNULL;
 676 #endif
 677
 678
 679
 680         *enc |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
 681         *enc |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
 682         *enc |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
 683         *enc |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
 684         *enc |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
 685         *enc |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES128:0;
 686         *enc |= (ssl_cipher_methods[SSL_ENC_AES256_IDX] == NULL) ? SSL_AES256:0;
 687         *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] == NULL) ? SSL_CAMELLIA128:0;
 688         *enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] == NULL) ? SSL_CAMELLIA256:0;
 689         *enc |= (ssl_cipher_methods[SSL_ENC_GOST89_IDX] == NULL) ? SSL_eGOST2814789CNT:0;
 690         *enc |= (ssl_cipher_methods[SSL_ENC_SEED_IDX] == NULL) ? SSL_SEED:0;
 691
 692         *mac |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
 693         *mac |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
 694         *mac |= (ssl_digest_methods[SSL_MD_GOST94_IDX] == NULL) ? SSL_GOST94:0;
 695         *mac |= (ssl_digest_methods[SSL_MD_GOST89MAC_IDX] == NULL || ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX]==NID_undef)? SSL_GOST89MAC:0;
 696
 697         }
 698
 699 static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
 700                 int num_of_ciphers,
 701                 unsigned long disabled_mkey, unsigned long disabled_auth,
 702                 unsigned long disabled_enc, unsigned long disabled_mac,
 703                 unsigned long disabled_ssl,
 704                 CIPHER_ORDER *co_list,
 705                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
 706         {
 707         int i, co_list_num;
 708         const SSL_CIPHER *c;
 709
 710         /*
 711          * We have num_of_ciphers descriptions compiled in, depending on the
 712          * method selected (SSLv2 and/or SSLv3, TLSv1 etc).
 713          * These will later be sorted in a linked list with at most num
 714          * entries.
 715          */
 716
 717         /* Get the initial list of ciphers */
 718         co_list_num = 0;        /* actual count of ciphers */
 719         for (i = 0; i < num_of_ciphers; i++)
 720                 {
 721                 c = ssl_method->get_cipher(i);
 722                 /* drop those that use any of that is not available */
 723                 if ((c != NULL) && c->valid &&
 724                     !(c->algorithm_mkey & disabled_mkey) &&
 725                     !(c->algorithm_auth & disabled_auth) &&
 726                     !(c->algorithm_enc & disabled_enc) &&
 727                     !(c->algorithm_mac & disabled_mac) &&
 728                     !(c->algorithm_ssl & disabled_ssl))
 729                         {
 730                         co_list[co_list_num].cipher = c;
 731                         co_list[co_list_num].next = NULL;
 732                         co_list[co_list_num].prev = NULL;
 733                         co_list[co_list_num].active = 0;
 734                         co_list_num++;
 735 #ifdef KSSL_DEBUG
 736                         printf("\t%d: %s %lx %lx %lx\n",i,c->name,c->id,c->algorithm_mkey,c->algorithm_auth);
 737 #endif  /* KSSL_DEBUG */
 738                         /*
 739                         if (!sk_push(ca_list,(char *)c)) goto err;
 740                         */
 741                         }
 742                 }
 743
 744         /*
 745          * Prepare linked list from list entries
 746          */
 747         if (co_list_num > 0)
 748                 {
 749                 co_list[0].prev = NULL;
 750
 751                 if (co_list_num > 1)
 752                         {
 753                         co_list[0].next = &co_list[1];
 754
 755                         for (i = 1; i < co_list_num - 1; i++)
 756                                 {
 757                                 co_list[i].prev = &co_list[i - 1];
 758                                 co_list[i].next = &co_list[i + 1];
 759                                 }
 760
 761                         co_list[co_list_num - 1].prev = &co_list[co_list_num - 2];
 762                         }
 763
 764                 co_list[co_list_num - 1].next = NULL;
 765
 766                 *head_p = &co_list[0];
 767                 *tail_p = &co_list[co_list_num - 1];
 768                 }
 769         }
 770
 771 static void ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list,
 772                         int num_of_group_aliases,
 773                         unsigned long disabled_mkey, unsigned long disabled_auth,
 774                         unsigned long disabled_enc, unsigned long disabled_mac,
 775                         unsigned long disabled_ssl,
 776                         CIPHER_ORDER *head)
 777         {
 778         CIPHER_ORDER *ciph_curr;
 779         const SSL_CIPHER **ca_curr;
 780         int i;
 781         unsigned long mask_mkey = ~disabled_mkey;
 782         unsigned long mask_auth = ~disabled_auth;
 783         unsigned long mask_enc = ~disabled_enc;
 784         unsigned long mask_mac = ~disabled_mac;
 785         unsigned long mask_ssl = ~disabled_ssl;
 786
 787         /*
 788          * First, add the real ciphers as already collected
 789          */
 790         ciph_curr = head;
 791         ca_curr = ca_list;
 792         while (ciph_curr != NULL)
 793                 {
 794                 *ca_curr = ciph_curr->cipher;
 795                 ca_curr++;
 796                 ciph_curr = ciph_curr->next;
 797                 }
 798
 799         /*
 800          * Now we add the available ones from the cipher_aliases[] table.
 801          * They represent either one or more algorithms, some of which
 802          * in any affected category must be supported (set in enabled_mask),
 803          * or represent a cipher strength value (will be added in any case because algorithms=0).
 804          */
 805         for (i = 0; i < num_of_group_aliases; i++)
 806                 {
 807                 unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey;
 808                 unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth;
 809                 unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc;
 810                 unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac;
 811                 unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl;
 812
 813                 if (algorithm_mkey)
 814                         if ((algorithm_mkey & mask_mkey) == 0)
 815                                 continue;
 816
 817                 if (algorithm_auth)
 818                         if ((algorithm_auth & mask_auth) == 0)
 819                                 continue;
 820
 821                 if (algorithm_enc)
 822                         if ((algorithm_enc & mask_enc) == 0)
 823                                 continue;
 824
 825                 if (algorithm_mac)
 826                         if ((algorithm_mac & mask_mac) == 0)
 827                                 continue;
 828
 829                 if (algorithm_ssl)
 830                         if ((algorithm_ssl & mask_ssl) == 0)
 831                                 continue;
 832
 833                 *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
 834                 ca_curr++;
 835                 }
 836
 837         *ca_curr = NULL;        /* end of list */
 838         }
 839
 840 static void ssl_cipher_apply_rule(unsigned long cipher_id,
 841                 unsigned long alg_mkey, unsigned long alg_auth,
 842                 unsigned long alg_enc, unsigned long alg_mac,
 843                 unsigned long alg_ssl,
 844                 unsigned long algo_strength,
 845                 int rule, int strength_bits,
 846                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
 847         {
 848         CIPHER_ORDER *head, *tail, *curr, *curr2, *last;
 849         const SSL_CIPHER *cp;
 850         int reverse = 0;
 851
 852 #ifdef CIPHER_DEBUG
 853         printf("Applying rule %d with %08lx/%08lx/%08lx/%08lx/%08lx %08lx (%d)\n",
 854                 rule, alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength, strength_bits);
 855 #endif
 856
 857         if (rule == CIPHER_DEL)
 858                 reverse = 1; /* needed to maintain sorting between currently deleted ciphers */
 859
 860         head = *head_p;
 861         tail = *tail_p;
 862
 863         if (reverse)
 864                 {
 865                 curr = tail;
 866                 last = head;
 867                 }
 868         else
 869                 {
 870                 curr = head;
 871                 last = tail;
 872                 }
 873
 874         curr2 = curr;
 875         for (;;)
 876                 {
 877                 if ((curr == NULL) || (curr == last)) break;
 878                 curr = curr2;
 879                 curr2 = reverse ? curr->prev : curr->next;
 880
 881                 cp = curr->cipher;
 882
 883                 /*
 884                  * Selection criteria is either the value of strength_bits
 885                  * or the algorithms used.
 886                  */
 887                 if (strength_bits >= 0)
 888                         {
 889                         if (strength_bits != cp->strength_bits)
 890                                 continue;
 891                         }
 892                 else
 893                         {
 894 #ifdef CIPHER_DEBUG
 895                         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);
 896 #endif
 897
 898                         if (alg_mkey && !(alg_mkey & cp->algorithm_mkey))
 899                                 continue;
 900                         if (alg_auth && !(alg_auth & cp->algorithm_auth))
 901                                 continue;
 902                         if (alg_enc && !(alg_enc & cp->algorithm_enc))
 903                                 continue;
 904                         if (alg_mac && !(alg_mac & cp->algorithm_mac))
 905                                 continue;
 906                         if (alg_ssl && !(alg_ssl & cp->algorithm_ssl))
 907                                 continue;
 908                         if ((algo_strength & SSL_EXP_MASK) && !(algo_strength & SSL_EXP_MASK & cp->algo_strength))
 909                                 continue;
 910                         if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
 911                                 continue;
 912                         }
 913
 914 #ifdef CIPHER_DEBUG
 915                 printf("Action = %d\n", rule);
 916 #endif
 917
 918                 /* add the cipher if it has not been added yet. */
 919                 if (rule == CIPHER_ADD)
 920                         {
 921                         /* reverse == 0 */
 922                         if (!curr->active)
 923                                 {
 924                                 ll_append_tail(&head, curr, &tail);
 925                                 curr->active = 1;
 926                                 }
 927                         }
 928                 /* Move the added cipher to this location */
 929                 else if (rule == CIPHER_ORD)
 930                         {
 931                         /* reverse == 0 */
 932                         if (curr->active)
 933                                 {
 934                                 ll_append_tail(&head, curr, &tail);
 935                                 }
 936                         }
 937                 else if (rule == CIPHER_DEL)
 938                         {
 939                         /* reverse == 1 */
 940                         if (curr->active)
 941                                 {
 942                                 /* most recently deleted ciphersuites get best positions
 943                                  * for any future CIPHER_ADD (note that the CIPHER_DEL loop
 944                                  * works in reverse to maintain the order) */
 945                                 ll_append_head(&head, curr, &tail);
 946                                 curr->active = 0;
 947                                 }
 948                         }
 949                 else if (rule == CIPHER_KILL)
 950                         {
 951                         /* reverse == 0 */
 952                         if (head == curr)
 953                                 head = curr->next;
 954                         else
 955                                 curr->prev->next = curr->next;
 956                         if (tail == curr)
 957                                 tail = curr->prev;
 958                         curr->active = 0;
 959                         if (curr->next != NULL)
 960                                 curr->next->prev = curr->prev;
 961                         if (curr->prev != NULL)
 962                                 curr->prev->next = curr->next;
 963                         curr->next = NULL;
 964                         curr->prev = NULL;
 965                         }
 966                 }
 967
 968         *head_p = head;
 969         *tail_p = tail;
 970         }
 971
 972 static int ssl_cipher_strength_sort(CIPHER_ORDER **head_p,
 973                                     CIPHER_ORDER **tail_p)
 974         {
 975         int max_strength_bits, i, *number_uses;
 976         CIPHER_ORDER *curr;
 977
 978         /*
 979          * This routine sorts the ciphers with descending strength. The sorting
 980          * must keep the pre-sorted sequence, so we apply the normal sorting
 981          * routine as '+' movement to the end of the list.
 982          */
 983         max_strength_bits = 0;
 984         curr = *head_p;
 985         while (curr != NULL)
 986                 {
 987                 if (curr->active &&
 988                     (curr->cipher->strength_bits > max_strength_bits))
 989                     max_strength_bits = curr->cipher->strength_bits;
 990                 curr = curr->next;
 991                 }
 992
 993         number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
 994         if (!number_uses)
 995                 {
 996                 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
 997                 return(0);
 998                 }
 999         memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
1000
1001         /*
1002          * Now find the strength_bits values actually used
1003          */
1004         curr = *head_p;
1005         while (curr != NULL)
1006                 {
1007                 if (curr->active)
1008                         number_uses[curr->cipher->strength_bits]++;
1009                 curr = curr->next;
1010                 }
1011         /*
1012          * Go through the list of used strength_bits values in descending
1013          * order.
1014          */
1015         for (i = max_strength_bits; i >= 0; i--)
1016                 if (number_uses[i] > 0)
1017                         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p);
1018
1019         OPENSSL_free(number_uses);
1020         return(1);
1021         }
1022
1023 static int ssl_cipher_process_rulestr(const char *rule_str,
1024                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p,
1025                 const SSL_CIPHER **ca_list)
1026         {
1027         unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength;
1028         const char *l, *start, *buf;
1029         int j, multi, found, rule, retval, ok, buflen;
1030         unsigned long cipher_id = 0;
1031         char ch;
1032
1033         retval = 1;
1034         l = rule_str;
1035         for (;;)
1036                 {
1037                 ch = *l;
1038
1039                 if (ch == '\0')
1040                         break;          /* done */
1041                 if (ch == '-')
1042                         { rule = CIPHER_DEL; l++; }
1043                 else if (ch == '+')
1044                         { rule = CIPHER_ORD; l++; }
1045                 else if (ch == '!')
1046                         { rule = CIPHER_KILL; l++; }
1047                 else if (ch == '@')
1048                         { rule = CIPHER_SPECIAL; l++; }
1049                 else
1050                         { rule = CIPHER_ADD; }
1051
1052                 if (ITEM_SEP(ch))
1053                         {
1054                         l++;
1055                         continue;
1056                         }
1057
1058                 alg_mkey = 0;
1059                 alg_auth = 0;
1060                 alg_enc = 0;
1061                 alg_mac = 0;
1062                 alg_ssl = 0;
1063                 algo_strength = 0;
1064
1065                 start=l;
1066                 for (;;)
1067                         {
1068                         ch = *l;
1069                         buf = l;
1070                         buflen = 0;
1071 #ifndef CHARSET_EBCDIC
1072                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
1073                                 ((ch >= '0') && (ch <= '9')) ||
1074                                 ((ch >= 'a') && (ch <= 'z')) ||
1075                                  (ch == '-'))
1076 #else
1077                         while ( isalnum(ch) || (ch == '-'))
1078 #endif
1079                                  {
1080                                  ch = *(++l);
1081                                  buflen++;
1082                                  }
1083
1084                         if (buflen == 0)
1085                                 {
1086                                 /*
1087                                  * We hit something we cannot deal with,
1088                                  * it is no command or separator nor
1089                                  * alphanumeric, so we call this an error.
1090                                  */
1091                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1092                                        SSL_R_INVALID_COMMAND);
1093                                 retval = found = 0;
1094                                 l++;
1095                                 break;
1096                                 }
1097
1098                         if (rule == CIPHER_SPECIAL)
1099                                 {
1100                                 found = 0; /* unused -- avoid compiler warning */
1101                                 break;  /* special treatment */
1102                                 }
1103
1104                         /* check for multi-part specification */
1105                         if (ch == '+')
1106                                 {
1107                                 multi=1;
1108                                 l++;
1109                                 }
1110                         else
1111                                 multi=0;
1112
1113                         /*
1114                          * Now search for the cipher alias in the ca_list. Be careful
1115                          * with the strncmp, because the "buflen" limitation
1116                          * will make the rule "ADH:SOME" and the cipher
1117                          * "ADH-MY-CIPHER" look like a match for buflen=3.
1118                          * So additionally check whether the cipher name found
1119                          * has the correct length. We can save a strlen() call:
1120                          * just checking for the '\0' at the right place is
1121                          * sufficient, we have to strncmp() anyway. (We cannot
1122                          * use strcmp(), because buf is not '\0' terminated.)
1123                          */
1124                         j = found = 0;
1125                         cipher_id = 0;
1126                         while (ca_list[j])
1127                                 {
1128                                 if (!strncmp(buf, ca_list[j]->name, buflen) &&
1129                                     (ca_list[j]->name[buflen] == '\0'))
1130                                         {
1131                                         found = 1;
1132                                         break;
1133                                         }
1134                                 else
1135                                         j++;
1136                                 }
1137
1138                         if (!found)
1139                                 break;  /* ignore this entry */
1140
1141                         if (ca_list[j]->algorithm_mkey)
1142                                 {
1143                                 if (alg_mkey)
1144                                         {
1145                                         alg_mkey &= ca_list[j]->algorithm_mkey;
1146                                         if (!alg_mkey) { found = 0; break; }
1147                                         }
1148                                 else
1149                                         alg_mkey = ca_list[j]->algorithm_mkey;
1150                                 }
1151
1152                         if (ca_list[j]->algorithm_auth)
1153                                 {
1154                                 if (alg_auth)
1155                                         {
1156                                         alg_auth &= ca_list[j]->algorithm_auth;
1157                                         if (!alg_auth) { found = 0; break; }
1158                                         }
1159                                 else
1160                                         alg_auth = ca_list[j]->algorithm_auth;
1161                                 }
1162
1163                         if (ca_list[j]->algorithm_enc)
1164                                 {
1165                                 if (alg_enc)
1166                                         {
1167                                         alg_enc &= ca_list[j]->algorithm_enc;
1168                                         if (!alg_enc) { found = 0; break; }
1169                                         }
1170                                 else
1171                                         alg_enc = ca_list[j]->algorithm_enc;
1172                                 }
1173
1174                         if (ca_list[j]->algorithm_mac)
1175                                 {
1176                                 if (alg_mac)
1177                                         {
1178                                         alg_mac &= ca_list[j]->algorithm_mac;
1179                                         if (!alg_mac) { found = 0; break; }
1180                                         }
1181                                 else
1182                                         alg_mac = ca_list[j]->algorithm_mac;
1183                                 }
1184
1185                         if (ca_list[j]->algo_strength & SSL_EXP_MASK)
1186                                 {
1187                                 if (algo_strength & SSL_EXP_MASK)
1188                                         {
1189                                         algo_strength &= (ca_list[j]->algo_strength & SSL_EXP_MASK) | ~SSL_EXP_MASK;
1190                                         if (!(algo_strength & SSL_EXP_MASK)) { found = 0; break; }
1191                                         }
1192                                 else
1193                                         algo_strength |= ca_list[j]->algo_strength & SSL_EXP_MASK;
1194                                 }
1195
1196                         if (ca_list[j]->algo_strength & SSL_STRONG_MASK)
1197                                 {
1198                                 if (algo_strength & SSL_STRONG_MASK)
1199                                         {
1200                                         algo_strength &= (ca_list[j]->algo_strength & SSL_STRONG_MASK) | ~SSL_STRONG_MASK;
1201                                         if (!(algo_strength & SSL_STRONG_MASK)) { found = 0; break; }
1202                                         }
1203                                 else
1204                                         algo_strength |= ca_list[j]->algo_strength & SSL_STRONG_MASK;
1205                                 }
1206
1207                         if (ca_list[j]->valid)
1208                                 {
1209                                 /* explicit ciphersuite found; its protocol version
1210                                  * does not become part of the search pattern!*/
1211
1212                                 cipher_id = ca_list[j]->id;
1213                                 }
1214                         else
1215                                 {
1216                                 /* not an explicit ciphersuite; only in this case, the
1217                                  * protocol version is considered part of the search pattern */
1218
1219                                 if (ca_list[j]->algorithm_ssl)
1220                                         {
1221                                         if (alg_ssl)
1222                                                 {
1223                                                 alg_ssl &= ca_list[j]->algorithm_ssl;
1224                                                 if (!alg_ssl) { found = 0; break; }
1225                                                 }
1226                                         else
1227                                                 alg_ssl = ca_list[j]->algorithm_ssl;
1228                                         }
1229                                 }
1230
1231                         if (!multi) break;
1232                         }
1233
1234                 /*
1235                  * Ok, we have the rule, now apply it
1236                  */
1237                 if (rule == CIPHER_SPECIAL)
1238                         {       /* special command */
1239                         ok = 0;
1240                         if ((buflen == 8) &&
1241                                 !strncmp(buf, "STRENGTH", 8))
1242                                 ok = ssl_cipher_strength_sort(head_p, tail_p);
1243                         else
1244                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1245                                         SSL_R_INVALID_COMMAND);
1246                         if (ok == 0)
1247                                 retval = 0;
1248                         /*
1249                          * We do not support any "multi" options
1250                          * together with "@", so throw away the
1251                          * rest of the command, if any left, until
1252                          * end or ':' is found.
1253                          */
1254                         while ((*l != '\0') && !ITEM_SEP(*l))
1255                                 l++;
1256                         }
1257                 else if (found)
1258                         {
1259                         ssl_cipher_apply_rule(cipher_id,
1260                                 alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength,
1261                                 rule, -1, head_p, tail_p);
1262                         }
1263                 else
1264                         {
1265                         while ((*l != '\0') && !ITEM_SEP(*l))
1266                                 l++;
1267                         }
1268                 if (*l == '\0') break; /* done */
1269                 }
1270
1271         return(retval);
1272         }
1273
1274 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
1275                 STACK_OF(SSL_CIPHER) **cipher_list,
1276                 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
1277                 const char *rule_str)
1278         {
1279         int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
1280         unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl;
1281         STACK_OF(SSL_CIPHER) *cipherstack, *tmp_cipher_list;
1282         const char *rule_p;
1283         CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
1284         const SSL_CIPHER **ca_list = NULL;
1285
1286         /*
1287          * Return with error if nothing to do.
1288          */
1289         if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == NULL)
1290                 return NULL;
1291
1292         /*
1293          * To reduce the work to do we only want to process the compiled
1294          * in algorithms, so we first get the mask of disabled ciphers.
1295          */
1296         ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl);
1297
1298         /*
1299          * Now we have to collect the available ciphers from the compiled
1300          * in ciphers. We cannot get more than the number compiled in, so
1301          * it is used for allocation.
1302          */
1303         num_of_ciphers = ssl_method->num_ciphers();
1304 #ifdef KSSL_DEBUG
1305         printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers);
1306 #endif    /* KSSL_DEBUG */
1307         co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
1308         if (co_list == NULL)
1309                 {
1310                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
1311                 return(NULL);   /* Failure */
1312                 }
1313
1314         ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers,
1315                                    disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl,
1316                                    co_list, &head, &tail);
1317
1318
1319         /* Now arrange all ciphers by preference: */
1320
1321         /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */
1322         ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1323         ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1324
1325         /* AES is our preferred symmetric cipher */
1326         ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1327
1328         /* Temporarily enable everything else for sorting */
1329         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1330
1331         /* Low priority for MD5 */
1332         ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail);
1333
1334         /* Move anonymous ciphers to the end.  Usually, these will remain disabled.
1335          * (For applications that allow them, they aren't too bad, but we prefer
1336          * authenticated ciphers.) */
1337         ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1338
1339         /* Move ciphers without forward secrecy to the end */
1340         ssl_cipher_apply_rule(0, 0, SSL_aECDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1341         /* ssl_cipher_apply_rule(0, 0, SSL_aDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail); */
1342         ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1343         ssl_cipher_apply_rule(0, SSL_kPSK, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1344         ssl_cipher_apply_rule(0, SSL_kKRB5, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1345
1346         /* RC4 is sort-of broken -- move the the end */
1347         ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
1348
1349         /* Now sort by symmetric encryption strength.  The above ordering remains
1350          * in force within each class */
1351         if (!ssl_cipher_strength_sort(&head, &tail))
1352                 {
1353                 OPENSSL_free(co_list);
1354                 return NULL;
1355                 }
1356
1357         /* Now disable everything (maintaining the ordering!) */
1358         ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1359
1360
1361         /*
1362          * We also need cipher aliases for selecting based on the rule_str.
1363          * There might be two types of entries in the rule_str: 1) names
1364          * of ciphers themselves 2) aliases for groups of ciphers.
1365          * For 1) we need the available ciphers and for 2) the cipher
1366          * groups of cipher_aliases added together in one list (otherwise
1367          * we would be happy with just the cipher_aliases table).
1368          */
1369         num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
1370         num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
1371         ca_list = OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
1372         if (ca_list == NULL)
1373                 {
1374                 OPENSSL_free(co_list);
1375                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
1376                 return(NULL);   /* Failure */
1377                 }
1378         ssl_cipher_collect_aliases(ca_list, num_of_group_aliases,
1379                                    disabled_mkey, disabled_auth, disabled_enc,
1380                                    disabled_mac, disabled_ssl, head);
1381
1382         /*
1383          * If the rule_string begins with DEFAULT, apply the default rule
1384          * before using the (possibly available) additional rules.
1385          */
1386         ok = 1;
1387         rule_p = rule_str;
1388         if (strncmp(rule_str,"DEFAULT",7) == 0)
1389                 {
1390                 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
1391                         &head, &tail, ca_list);
1392                 rule_p += 7;
1393                 if (*rule_p == ':')
1394                         rule_p++;
1395                 }
1396
1397         if (ok && (strlen(rule_p) > 0))
1398                 ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list);
1399
1400         OPENSSL_free((void *)ca_list);  /* Not needed anymore */
1401
1402         if (!ok)
1403                 {       /* Rule processing failure */
1404                 OPENSSL_free(co_list);
1405                 return(NULL);
1406                 }
1407
1408         /*
1409          * Allocate new "cipherstack" for the result, return with error
1410          * if we cannot get one.
1411          */
1412         if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
1413                 {
1414                 OPENSSL_free(co_list);
1415                 return(NULL);
1416                 }
1417
1418         /*
1419          * The cipher selection for the list is done. The ciphers are added
1420          * to the resulting precedence to the STACK_OF(SSL_CIPHER).
1421          */
1422         for (curr = head; curr != NULL; curr = curr->next)
1423                 {
1424                 if (curr->active)
1425                         {
1426                         sk_SSL_CIPHER_push(cipherstack, curr->cipher);
1427 #ifdef CIPHER_DEBUG
1428                         printf("<%s>\n",curr->cipher->name);
1429 #endif
1430                         }
1431                 }
1432         OPENSSL_free(co_list);  /* Not needed any longer */
1433
1434         tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack);
1435         if (tmp_cipher_list == NULL)
1436                 {
1437                 sk_SSL_CIPHER_free(cipherstack);
1438                 return NULL;
1439                 }
1440         if (*cipher_list != NULL)
1441                 sk_SSL_CIPHER_free(*cipher_list);
1442         *cipher_list = cipherstack;
1443         if (*cipher_list_by_id != NULL)
1444                 sk_SSL_CIPHER_free(*cipher_list_by_id);
1445         *cipher_list_by_id = tmp_cipher_list;
1446         (void)sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
1447
1448         return(cipherstack);
1449         }
1450
1451 char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
1452         {
1453         int is_export,pkl,kl;
1454         const char *ver,*exp_str;
1455         const char *kx,*au,*enc,*mac;
1456         unsigned long alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl,alg2,alg_s;
1457 #ifdef KSSL_DEBUG
1458         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx/%lx/%lx/%lx/%lx\n";
1459 #else
1460         static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
1461 #endif /* KSSL_DEBUG */
1462
1463         alg_mkey = cipher->algorithm_mkey;
1464         alg_auth = cipher->algorithm_auth;
1465         alg_enc = cipher->algorithm_enc;
1466         alg_mac = cipher->algorithm_mac;
1467         alg_ssl = cipher->algorithm_ssl;
1468
1469         alg_s=cipher->algo_strength;
1470         alg2=cipher->algorithm2;
1471
1472         is_export=SSL_C_IS_EXPORT(cipher);
1473         pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
1474         kl=SSL_C_EXPORT_KEYLENGTH(cipher);
1475         exp_str=is_export?" export":"";
1476
1477         if (alg_ssl & SSL_SSLV2)
1478                 ver="SSLv2";
1479         else if (alg_ssl & SSL_SSLV3)
1480                 ver="SSLv3";
1481         else
1482                 ver="unknown";
1483
1484         switch (alg_mkey)
1485                 {
1486         case SSL_kRSA:
1487                 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
1488                 break;
1489         case SSL_kDHr:
1490                 kx="DH/RSA";
1491                 break;
1492         case SSL_kDHd:
1493                 kx="DH/DSS";
1494                 break;
1495         case SSL_kKRB5:
1496                 kx="KRB5";
1497                 break;
1498         case SSL_kEDH:
1499                 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
1500                 break;
1501         case SSL_kECDHr:
1502                 kx="ECDH/RSA";
1503                 break;
1504         case SSL_kECDHe:
1505                 kx="ECDH/ECDSA";
1506                 break;
1507         case SSL_kEECDH:
1508                 kx="ECDH";
1509                 break;
1510         case SSL_kPSK:
1511                 kx="PSK";
1512                 break;
1513         default:
1514                 kx="unknown";
1515                 }
1516
1517         switch (alg_auth)
1518                 {
1519         case SSL_aRSA:
1520                 au="RSA";
1521                 break;
1522         case SSL_aDSS:
1523                 au="DSS";
1524                 break;
1525         case SSL_aDH:
1526                 au="DH";
1527                 break;
1528         case SSL_aKRB5:
1529                 au="KRB5";
1530                 break;
1531         case SSL_aECDH:
1532                 au="ECDH";
1533                 break;
1534         case SSL_aNULL:
1535                 au="None";
1536                 break;
1537         case SSL_aECDSA:
1538                 au="ECDSA";
1539                 break;
1540         case SSL_aPSK:
1541                 au="PSK";
1542                 break;
1543         default:
1544                 au="unknown";
1545                 break;
1546                 }
1547
1548         switch (alg_enc)
1549                 {
1550         case SSL_DES:
1551                 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
1552                 break;
1553         case SSL_3DES:
1554                 enc="3DES(168)";
1555                 break;
1556         case SSL_RC4:
1557                 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
1558                   :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
1559                 break;
1560         case SSL_RC2:
1561                 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
1562                 break;
1563         case SSL_IDEA:
1564                 enc="IDEA(128)";
1565                 break;
1566         case SSL_eNULL:
1567                 enc="None";
1568                 break;
1569         case SSL_AES128:
1570                 enc="AES(128)";
1571                 break;
1572         case SSL_AES256:
1573                 enc="AES(256)";
1574                 break;
1575         case SSL_CAMELLIA128:
1576                 enc="Camellia(128)";
1577                 break;
1578         case SSL_CAMELLIA256:
1579                 enc="Camellia(256)";
1580                 break;
1581         case SSL_SEED:
1582                 enc="SEED(128)";
1583                 break;
1584         default:
1585                 enc="unknown";
1586                 break;
1587                 }
1588
1589         switch (alg_mac)
1590                 {
1591         case SSL_MD5:
1592                 mac="MD5";
1593                 break;
1594         case SSL_SHA1:
1595                 mac="SHA1";
1596                 break;
1597         default:
1598                 mac="unknown";
1599                 break;
1600                 }
1601
1602         if (buf == NULL)
1603                 {
1604                 len=128;
1605                 buf=OPENSSL_malloc(len);
1606                 if (buf == NULL) return("OPENSSL_malloc Error");
1607                 }
1608         else if (len < 128)
1609                 return("Buffer too small");
1610
1611 #ifdef KSSL_DEBUG
1612         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl);
1613 #else
1614         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str);
1615 #endif /* KSSL_DEBUG */
1616         return(buf);
1617         }
1618
1619 char *SSL_CIPHER_get_version(const SSL_CIPHER *c)
1620         {
1621         int i;
1622
1623         if (c == NULL) return("(NONE)");
1624         i=(int)(c->id>>24L);
1625         if (i == 3)
1626                 return("TLSv1/SSLv3");
1627         else if (i == 2)
1628                 return("SSLv2");
1629         else
1630                 return("unknown");
1631         }
1632
1633 /* return the actual cipher being used */
1634 const char *SSL_CIPHER_get_name(const SSL_CIPHER *c)
1635         {
1636         if (c != NULL)
1637                 return(c->name);
1638         return("(NONE)");
1639         }
1640
1641 /* number of bits for symmetric cipher */
1642 int SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
1643         {
1644         int ret=0;
1645
1646         if (c != NULL)
1647                 {
1648                 if (alg_bits != NULL) *alg_bits = c->alg_bits;
1649                 ret = c->strength_bits;
1650                 }
1651         return(ret);
1652         }
1653
1654 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
1655         {
1656         SSL_COMP *ctmp;
1657         int i,nn;
1658
1659         if ((n == 0) || (sk == NULL)) return(NULL);
1660         nn=sk_SSL_COMP_num(sk);
1661         for (i=0; i<nn; i++)
1662                 {
1663                 ctmp=sk_SSL_COMP_value(sk,i);
1664                 if (ctmp->id == n)
1665                         return(ctmp);
1666                 }
1667         return(NULL);
1668         }
1669
1670 #ifdef OPENSSL_NO_COMP
1671 void *SSL_COMP_get_compression_methods(void)
1672         {
1673         return NULL;
1674         }
1675 int SSL_COMP_add_compression_method(int id, void *cm)
1676         {
1677         return 1;
1678         }
1679
1680 const char *SSL_COMP_get_name(const void *comp)
1681         {
1682         return NULL;
1683         }
1684 #else
1685 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
1686         {
1687         load_builtin_compressions();
1688         return(ssl_comp_methods);
1689         }
1690
1691 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
1692         {
1693         SSL_COMP *comp;
1694
1695         if (cm == NULL || cm->type == NID_undef)
1696                 return 1;
1697
1698         /* According to draft-ietf-tls-compression-04.txt, the
1699            compression number ranges should be the following:
1700
1701            0 to 63:    methods defined by the IETF
1702            64 to 192:  external party methods assigned by IANA
1703            193 to 255: reserved for private use */
1704         if (id < 193 || id > 255)
1705                 {
1706                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_COMPRESSION_ID_NOT_WITHIN_PRIVATE_RANGE);
1707                 return 0;
1708                 }
1709
1710         MemCheck_off();
1711         comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
1712         comp->id=id;
1713         comp->method=cm;
1714         load_builtin_compressions();
1715         if (ssl_comp_methods
1716                 && !sk_SSL_COMP_find(ssl_comp_methods,comp))
1717                 {
1718                 OPENSSL_free(comp);
1719                 MemCheck_on();
1720                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_DUPLICATE_COMPRESSION_ID);
1721                 return(1);
1722                 }
1723         else if ((ssl_comp_methods == NULL)
1724                 || !sk_SSL_COMP_push(ssl_comp_methods,comp))
1725                 {
1726                 OPENSSL_free(comp);
1727                 MemCheck_on();
1728                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
1729                 return(1);
1730                 }
1731         else
1732                 {
1733                 MemCheck_on();
1734                 return(0);
1735                 }
1736         }
1737
1738 const char *SSL_COMP_get_name(const COMP_METHOD *comp)
1739         {
1740         if (comp)
1741                 return comp->name;
1742         return NULL;
1743         }
1744
1745 #endif