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