1147 lines
29 KiB
C
1147 lines
29 KiB
C
/* ssl/ssl_ciph.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <openssl/objects.h>
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#include <openssl/comp.h>
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#include "ssl_locl.h"
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#define SSL_ENC_DES_IDX 0
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#define SSL_ENC_3DES_IDX 1
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#define SSL_ENC_RC4_IDX 2
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#define SSL_ENC_RC2_IDX 3
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#define SSL_ENC_IDEA_IDX 4
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#define SSL_ENC_eFZA_IDX 5
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#define SSL_ENC_NULL_IDX 6
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#define SSL_ENC_AES128_IDX 7
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#define SSL_ENC_AES256_IDX 8
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#define SSL_ENC_NUM_IDX 9
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static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
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NULL,NULL,NULL,NULL,NULL,NULL,
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};
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static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
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#define SSL_MD_MD5_IDX 0
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#define SSL_MD_SHA1_IDX 1
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#define SSL_MD_NUM_IDX 2
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static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
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NULL,NULL,
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};
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#define CIPHER_ADD 1
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#define CIPHER_KILL 2
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#define CIPHER_DEL 3
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#define CIPHER_ORD 4
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#define CIPHER_SPECIAL 5
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typedef struct cipher_order_st
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{
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SSL_CIPHER *cipher;
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int active;
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int dead;
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struct cipher_order_st *next,*prev;
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} CIPHER_ORDER;
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static const SSL_CIPHER cipher_aliases[]={
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/* Don't include eNULL unless specifically enabled. */
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{0,SSL_TXT_ALL, 0,SSL_ALL & ~SSL_eNULL, SSL_ALL ,0,0,0,SSL_ALL,SSL_ALL}, /* must be first */
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{0,SSL_TXT_CMPALL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0}, /* COMPLEMENT OF ALL */
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{0,SSL_TXT_CMPDEF,0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK,0},
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{0,SSL_TXT_kKRB5,0,SSL_kKRB5,0,0,0,0,SSL_MKEY_MASK,0}, /* VRS Kerberos5 */
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{0,SSL_TXT_kRSA,0,SSL_kRSA, 0,0,0,0,SSL_MKEY_MASK,0},
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{0,SSL_TXT_kDHr,0,SSL_kDHr, 0,0,0,0,SSL_MKEY_MASK,0},
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{0,SSL_TXT_kDHd,0,SSL_kDHd, 0,0,0,0,SSL_MKEY_MASK,0},
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{0,SSL_TXT_kEDH,0,SSL_kEDH, 0,0,0,0,SSL_MKEY_MASK,0},
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{0,SSL_TXT_kFZA,0,SSL_kFZA, 0,0,0,0,SSL_MKEY_MASK,0},
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{0,SSL_TXT_DH, 0,SSL_DH, 0,0,0,0,SSL_MKEY_MASK,0},
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{0,SSL_TXT_EDH, 0,SSL_EDH, 0,0,0,0,SSL_MKEY_MASK|SSL_AUTH_MASK,0},
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{0,SSL_TXT_aKRB5,0,SSL_aKRB5,0,0,0,0,SSL_AUTH_MASK,0}, /* VRS Kerberos5 */
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{0,SSL_TXT_aRSA,0,SSL_aRSA, 0,0,0,0,SSL_AUTH_MASK,0},
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{0,SSL_TXT_aDSS,0,SSL_aDSS, 0,0,0,0,SSL_AUTH_MASK,0},
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{0,SSL_TXT_aFZA,0,SSL_aFZA, 0,0,0,0,SSL_AUTH_MASK,0},
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{0,SSL_TXT_aNULL,0,SSL_aNULL,0,0,0,0,SSL_AUTH_MASK,0},
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{0,SSL_TXT_aDH, 0,SSL_aDH, 0,0,0,0,SSL_AUTH_MASK,0},
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{0,SSL_TXT_DSS, 0,SSL_DSS, 0,0,0,0,SSL_AUTH_MASK,0},
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{0,SSL_TXT_DES, 0,SSL_DES, 0,0,0,0,SSL_ENC_MASK,0},
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{0,SSL_TXT_3DES,0,SSL_3DES, 0,0,0,0,SSL_ENC_MASK,0},
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{0,SSL_TXT_RC4, 0,SSL_RC4, 0,0,0,0,SSL_ENC_MASK,0},
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{0,SSL_TXT_RC2, 0,SSL_RC2, 0,0,0,0,SSL_ENC_MASK,0},
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#ifndef OPENSSL_NO_IDEA
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{0,SSL_TXT_IDEA,0,SSL_IDEA, 0,0,0,0,SSL_ENC_MASK,0},
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#endif
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{0,SSL_TXT_eNULL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0},
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{0,SSL_TXT_eFZA,0,SSL_eFZA, 0,0,0,0,SSL_ENC_MASK,0},
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{0,SSL_TXT_AES, 0,SSL_AES, 0,0,0,0,SSL_ENC_MASK,0},
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{0,SSL_TXT_MD5, 0,SSL_MD5, 0,0,0,0,SSL_MAC_MASK,0},
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{0,SSL_TXT_SHA1,0,SSL_SHA1, 0,0,0,0,SSL_MAC_MASK,0},
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{0,SSL_TXT_SHA, 0,SSL_SHA, 0,0,0,0,SSL_MAC_MASK,0},
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{0,SSL_TXT_NULL,0,SSL_NULL, 0,0,0,0,SSL_ENC_MASK,0},
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{0,SSL_TXT_KRB5,0,SSL_KRB5, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
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{0,SSL_TXT_RSA, 0,SSL_RSA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
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{0,SSL_TXT_ADH, 0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
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{0,SSL_TXT_FZA, 0,SSL_FZA, 0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK,0},
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{0,SSL_TXT_SSLV2, 0,SSL_SSLV2, 0,0,0,0,SSL_SSL_MASK,0},
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{0,SSL_TXT_SSLV3, 0,SSL_SSLV3, 0,0,0,0,SSL_SSL_MASK,0},
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{0,SSL_TXT_TLSV1, 0,SSL_TLSV1, 0,0,0,0,SSL_SSL_MASK,0},
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{0,SSL_TXT_EXP ,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK},
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{0,SSL_TXT_EXPORT,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK},
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{0,SSL_TXT_EXP40, 0, 0, SSL_EXP40, 0,0,0,0,SSL_STRONG_MASK},
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{0,SSL_TXT_EXP56, 0, 0, SSL_EXP56, 0,0,0,0,SSL_STRONG_MASK},
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{0,SSL_TXT_LOW, 0, 0, SSL_LOW, 0,0,0,0,SSL_STRONG_MASK},
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{0,SSL_TXT_MEDIUM,0, 0,SSL_MEDIUM, 0,0,0,0,SSL_STRONG_MASK},
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{0,SSL_TXT_HIGH, 0, 0, SSL_HIGH, 0,0,0,0,SSL_STRONG_MASK},
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};
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static int init_ciphers=1;
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static void load_ciphers(void)
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{
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init_ciphers=0;
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ssl_cipher_methods[SSL_ENC_DES_IDX]=
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EVP_get_cipherbyname(SN_des_cbc);
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ssl_cipher_methods[SSL_ENC_3DES_IDX]=
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EVP_get_cipherbyname(SN_des_ede3_cbc);
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ssl_cipher_methods[SSL_ENC_RC4_IDX]=
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EVP_get_cipherbyname(SN_rc4);
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ssl_cipher_methods[SSL_ENC_RC2_IDX]=
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EVP_get_cipherbyname(SN_rc2_cbc);
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#ifndef OPENSSL_NO_IDEA
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ssl_cipher_methods[SSL_ENC_IDEA_IDX]=
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EVP_get_cipherbyname(SN_idea_cbc);
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#else
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ssl_cipher_methods[SSL_ENC_IDEA_IDX]= NULL;
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#endif
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ssl_cipher_methods[SSL_ENC_AES128_IDX]=
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EVP_get_cipherbyname(SN_aes_128_cbc);
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ssl_cipher_methods[SSL_ENC_AES256_IDX]=
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EVP_get_cipherbyname(SN_aes_256_cbc);
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ssl_digest_methods[SSL_MD_MD5_IDX]=
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EVP_get_digestbyname(SN_md5);
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ssl_digest_methods[SSL_MD_SHA1_IDX]=
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EVP_get_digestbyname(SN_sha1);
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}
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int ssl_cipher_get_evp(SSL_SESSION *s, const EVP_CIPHER **enc,
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const EVP_MD **md, SSL_COMP **comp)
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{
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int i;
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SSL_CIPHER *c;
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c=s->cipher;
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if (c == NULL) return(0);
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if (comp != NULL)
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{
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SSL_COMP ctmp;
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if (s->compress_meth == 0)
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*comp=NULL;
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else if (ssl_comp_methods == NULL)
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{
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/* bad */
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*comp=NULL;
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}
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else
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{
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ctmp.id=s->compress_meth;
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i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
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if (i >= 0)
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*comp=sk_SSL_COMP_value(ssl_comp_methods,i);
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else
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*comp=NULL;
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}
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}
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if ((enc == NULL) || (md == NULL)) return(0);
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switch (c->algorithms & SSL_ENC_MASK)
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{
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case SSL_DES:
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i=SSL_ENC_DES_IDX;
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break;
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case SSL_3DES:
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i=SSL_ENC_3DES_IDX;
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break;
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case SSL_RC4:
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i=SSL_ENC_RC4_IDX;
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break;
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case SSL_RC2:
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i=SSL_ENC_RC2_IDX;
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break;
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case SSL_IDEA:
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i=SSL_ENC_IDEA_IDX;
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break;
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case SSL_eNULL:
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i=SSL_ENC_NULL_IDX;
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break;
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case SSL_AES:
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switch(c->alg_bits)
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{
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case 128: i=SSL_ENC_AES128_IDX; break;
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case 256: i=SSL_ENC_AES256_IDX; break;
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default: i=-1; break;
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}
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break;
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default:
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i= -1;
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break;
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}
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if ((i < 0) || (i > SSL_ENC_NUM_IDX))
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*enc=NULL;
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else
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{
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if (i == SSL_ENC_NULL_IDX)
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*enc=EVP_enc_null();
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else
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*enc=ssl_cipher_methods[i];
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}
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switch (c->algorithms & SSL_MAC_MASK)
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{
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case SSL_MD5:
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i=SSL_MD_MD5_IDX;
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break;
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case SSL_SHA1:
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i=SSL_MD_SHA1_IDX;
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break;
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default:
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i= -1;
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break;
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}
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if ((i < 0) || (i > SSL_MD_NUM_IDX))
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*md=NULL;
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else
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*md=ssl_digest_methods[i];
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if ((*enc != NULL) && (*md != NULL))
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return(1);
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else
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return(0);
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}
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#define ITEM_SEP(a) \
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(((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
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static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
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CIPHER_ORDER **tail)
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{
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if (curr == *tail) return;
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if (curr == *head)
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*head=curr->next;
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if (curr->prev != NULL)
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curr->prev->next=curr->next;
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if (curr->next != NULL) /* should always be true */
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curr->next->prev=curr->prev;
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(*tail)->next=curr;
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curr->prev= *tail;
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curr->next=NULL;
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*tail=curr;
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}
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static unsigned long ssl_cipher_get_disabled(void)
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{
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unsigned long mask;
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mask = SSL_kFZA;
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#ifdef OPENSSL_NO_RSA
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mask |= SSL_aRSA|SSL_kRSA;
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#endif
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#ifdef OPENSSL_NO_DSA
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mask |= SSL_aDSS;
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#endif
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#ifdef OPENSSL_NO_DH
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mask |= SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
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#endif
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#ifdef OPENSSL_NO_KRB5
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mask |= SSL_kKRB5|SSL_aKRB5;
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#endif
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#ifdef SSL_FORBID_ENULL
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mask |= SSL_eNULL;
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#endif
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mask |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
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mask |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
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mask |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
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mask |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
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mask |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
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mask |= (ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL) ? SSL_eFZA:0;
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mask |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES:0;
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mask |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
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mask |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
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return(mask);
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}
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static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
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int num_of_ciphers, unsigned long mask, CIPHER_ORDER *co_list,
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CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
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{
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int i, co_list_num;
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SSL_CIPHER *c;
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/*
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* We have num_of_ciphers descriptions compiled in, depending on the
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* method selected (SSLv2 and/or SSLv3, TLSv1 etc).
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* These will later be sorted in a linked list with at most num
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* entries.
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*/
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/* Get the initial list of ciphers */
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co_list_num = 0; /* actual count of ciphers */
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for (i = 0; i < num_of_ciphers; i++)
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{
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c = ssl_method->get_cipher(i);
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/* drop those that use any of that is not available */
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if ((c != NULL) && c->valid && !(c->algorithms & mask))
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{
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co_list[co_list_num].cipher = c;
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co_list[co_list_num].next = NULL;
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co_list[co_list_num].prev = NULL;
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co_list[co_list_num].active = 0;
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co_list_num++;
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#ifdef KSSL_DEBUG
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printf("\t%d: %s %lx %lx\n",i,c->name,c->id,c->algorithms);
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#endif /* KSSL_DEBUG */
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/*
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if (!sk_push(ca_list,(char *)c)) goto err;
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*/
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}
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}
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/*
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* Prepare linked list from list entries
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*/
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for (i = 1; i < co_list_num - 1; i++)
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{
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co_list[i].prev = &(co_list[i-1]);
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co_list[i].next = &(co_list[i+1]);
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}
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if (co_list_num > 0)
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{
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(*head_p) = &(co_list[0]);
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(*head_p)->prev = NULL;
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(*head_p)->next = &(co_list[1]);
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(*tail_p) = &(co_list[co_list_num - 1]);
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(*tail_p)->prev = &(co_list[co_list_num - 2]);
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(*tail_p)->next = NULL;
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}
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}
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static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list,
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int num_of_group_aliases, unsigned long mask,
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CIPHER_ORDER *head)
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{
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CIPHER_ORDER *ciph_curr;
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SSL_CIPHER **ca_curr;
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int i;
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/*
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* First, add the real ciphers as already collected
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*/
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ciph_curr = head;
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ca_curr = ca_list;
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while (ciph_curr != NULL)
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{
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*ca_curr = ciph_curr->cipher;
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ca_curr++;
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ciph_curr = ciph_curr->next;
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}
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/*
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* Now we add the available ones from the cipher_aliases[] table.
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* They represent either an algorithm, that must be fully
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* supported (not match any bit in mask) or represent a cipher
|
|
* strength value (will be added in any case because algorithms=0).
|
|
*/
|
|
for (i = 0; i < num_of_group_aliases; i++)
|
|
{
|
|
if ((i == 0) || /* always fetch "ALL" */
|
|
!(cipher_aliases[i].algorithms & mask))
|
|
{
|
|
*ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
|
|
ca_curr++;
|
|
}
|
|
}
|
|
|
|
*ca_curr = NULL; /* end of list */
|
|
}
|
|
|
|
static void ssl_cipher_apply_rule(unsigned long algorithms, unsigned long mask,
|
|
unsigned long algo_strength, unsigned long mask_strength,
|
|
int rule, int strength_bits, CIPHER_ORDER *co_list,
|
|
CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
|
|
{
|
|
CIPHER_ORDER *head, *tail, *curr, *curr2, *tail2;
|
|
SSL_CIPHER *cp;
|
|
unsigned long ma, ma_s;
|
|
|
|
#ifdef CIPHER_DEBUG
|
|
printf("Applying rule %d with %08lx %08lx %08lx %08lx (%d)\n",
|
|
rule, algorithms, mask, algo_strength, mask_strength,
|
|
strength_bits);
|
|
#endif
|
|
|
|
curr = head = *head_p;
|
|
curr2 = head;
|
|
tail2 = tail = *tail_p;
|
|
for (;;)
|
|
{
|
|
if ((curr == NULL) || (curr == tail2)) break;
|
|
curr = curr2;
|
|
curr2 = curr->next;
|
|
|
|
cp = curr->cipher;
|
|
|
|
/*
|
|
* Selection criteria is either the number of strength_bits
|
|
* or the algorithm used.
|
|
*/
|
|
if (strength_bits == -1)
|
|
{
|
|
ma = mask & cp->algorithms;
|
|
ma_s = mask_strength & cp->algo_strength;
|
|
|
|
#ifdef CIPHER_DEBUG
|
|
printf("\nName: %s:\nAlgo = %08lx Algo_strength = %08lx\nMask = %08lx Mask_strength %08lx\n", cp->name, cp->algorithms, cp->algo_strength, mask, mask_strength);
|
|
printf("ma = %08lx ma_s %08lx, ma&algo=%08lx, ma_s&algos=%08lx\n", ma, ma_s, ma&algorithms, ma_s&algo_strength);
|
|
#endif
|
|
/*
|
|
* Select: if none of the mask bit was met from the
|
|
* cipher or not all of the bits were met, the
|
|
* selection does not apply.
|
|
*/
|
|
if (((ma == 0) && (ma_s == 0)) ||
|
|
((ma & algorithms) != ma) ||
|
|
((ma_s & algo_strength) != ma_s))
|
|
continue; /* does not apply */
|
|
}
|
|
else if (strength_bits != cp->strength_bits)
|
|
continue; /* does not apply */
|
|
|
|
#ifdef CIPHER_DEBUG
|
|
printf("Action = %d\n", rule);
|
|
#endif
|
|
|
|
/* add the cipher if it has not been added yet. */
|
|
if (rule == CIPHER_ADD)
|
|
{
|
|
if (!curr->active)
|
|
{
|
|
ll_append_tail(&head, curr, &tail);
|
|
curr->active = 1;
|
|
}
|
|
}
|
|
/* Move the added cipher to this location */
|
|
else if (rule == CIPHER_ORD)
|
|
{
|
|
if (curr->active)
|
|
{
|
|
ll_append_tail(&head, curr, &tail);
|
|
}
|
|
}
|
|
else if (rule == CIPHER_DEL)
|
|
curr->active = 0;
|
|
else if (rule == CIPHER_KILL)
|
|
{
|
|
if (head == curr)
|
|
head = curr->next;
|
|
else
|
|
curr->prev->next = curr->next;
|
|
if (tail == curr)
|
|
tail = curr->prev;
|
|
curr->active = 0;
|
|
if (curr->next != NULL)
|
|
curr->next->prev = curr->prev;
|
|
if (curr->prev != NULL)
|
|
curr->prev->next = curr->next;
|
|
curr->next = NULL;
|
|
curr->prev = NULL;
|
|
}
|
|
}
|
|
|
|
*head_p = head;
|
|
*tail_p = tail;
|
|
}
|
|
|
|
static int ssl_cipher_strength_sort(CIPHER_ORDER *co_list,
|
|
CIPHER_ORDER **head_p,
|
|
CIPHER_ORDER **tail_p)
|
|
{
|
|
int max_strength_bits, i, *number_uses;
|
|
CIPHER_ORDER *curr;
|
|
|
|
/*
|
|
* This routine sorts the ciphers with descending strength. The sorting
|
|
* must keep the pre-sorted sequence, so we apply the normal sorting
|
|
* routine as '+' movement to the end of the list.
|
|
*/
|
|
max_strength_bits = 0;
|
|
curr = *head_p;
|
|
while (curr != NULL)
|
|
{
|
|
if (curr->active &&
|
|
(curr->cipher->strength_bits > max_strength_bits))
|
|
max_strength_bits = curr->cipher->strength_bits;
|
|
curr = curr->next;
|
|
}
|
|
|
|
number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
|
|
if (!number_uses)
|
|
{
|
|
SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
|
|
return(0);
|
|
}
|
|
memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
|
|
|
|
/*
|
|
* Now find the strength_bits values actually used
|
|
*/
|
|
curr = *head_p;
|
|
while (curr != NULL)
|
|
{
|
|
if (curr->active)
|
|
number_uses[curr->cipher->strength_bits]++;
|
|
curr = curr->next;
|
|
}
|
|
/*
|
|
* Go through the list of used strength_bits values in descending
|
|
* order.
|
|
*/
|
|
for (i = max_strength_bits; i >= 0; i--)
|
|
if (number_uses[i] > 0)
|
|
ssl_cipher_apply_rule(0, 0, 0, 0, CIPHER_ORD, i,
|
|
co_list, head_p, tail_p);
|
|
|
|
OPENSSL_free(number_uses);
|
|
return(1);
|
|
}
|
|
|
|
static int ssl_cipher_process_rulestr(const char *rule_str,
|
|
CIPHER_ORDER *co_list, CIPHER_ORDER **head_p,
|
|
CIPHER_ORDER **tail_p, SSL_CIPHER **ca_list)
|
|
{
|
|
unsigned long algorithms, mask, algo_strength, mask_strength;
|
|
const char *l, *start, *buf;
|
|
int j, multi, found, rule, retval, ok, buflen;
|
|
char ch;
|
|
|
|
retval = 1;
|
|
l = rule_str;
|
|
for (;;)
|
|
{
|
|
ch = *l;
|
|
|
|
if (ch == '\0')
|
|
break; /* done */
|
|
if (ch == '-')
|
|
{ rule = CIPHER_DEL; l++; }
|
|
else if (ch == '+')
|
|
{ rule = CIPHER_ORD; l++; }
|
|
else if (ch == '!')
|
|
{ rule = CIPHER_KILL; l++; }
|
|
else if (ch == '@')
|
|
{ rule = CIPHER_SPECIAL; l++; }
|
|
else
|
|
{ rule = CIPHER_ADD; }
|
|
|
|
if (ITEM_SEP(ch))
|
|
{
|
|
l++;
|
|
continue;
|
|
}
|
|
|
|
algorithms = mask = algo_strength = mask_strength = 0;
|
|
|
|
start=l;
|
|
for (;;)
|
|
{
|
|
ch = *l;
|
|
buf = l;
|
|
buflen = 0;
|
|
#ifndef CHARSET_EBCDIC
|
|
while ( ((ch >= 'A') && (ch <= 'Z')) ||
|
|
((ch >= '0') && (ch <= '9')) ||
|
|
((ch >= 'a') && (ch <= 'z')) ||
|
|
(ch == '-'))
|
|
#else
|
|
while ( isalnum(ch) || (ch == '-'))
|
|
#endif
|
|
{
|
|
ch = *(++l);
|
|
buflen++;
|
|
}
|
|
|
|
if (buflen == 0)
|
|
{
|
|
/*
|
|
* We hit something we cannot deal with,
|
|
* it is no command or separator nor
|
|
* alphanumeric, so we call this an error.
|
|
*/
|
|
SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
|
|
SSL_R_INVALID_COMMAND);
|
|
retval = found = 0;
|
|
l++;
|
|
break;
|
|
}
|
|
|
|
if (rule == CIPHER_SPECIAL)
|
|
{
|
|
found = 0; /* unused -- avoid compiler warning */
|
|
break; /* special treatment */
|
|
}
|
|
|
|
/* check for multi-part specification */
|
|
if (ch == '+')
|
|
{
|
|
multi=1;
|
|
l++;
|
|
}
|
|
else
|
|
multi=0;
|
|
|
|
/*
|
|
* Now search for the cipher alias in the ca_list. Be careful
|
|
* with the strncmp, because the "buflen" limitation
|
|
* will make the rule "ADH:SOME" and the cipher
|
|
* "ADH-MY-CIPHER" look like a match for buflen=3.
|
|
* So additionally check whether the cipher name found
|
|
* has the correct length. We can save a strlen() call:
|
|
* just checking for the '\0' at the right place is
|
|
* sufficient, we have to strncmp() anyway. (We cannot
|
|
* use strcmp(), because buf is not '\0' terminated.)
|
|
*/
|
|
j = found = 0;
|
|
while (ca_list[j])
|
|
{
|
|
if (!strncmp(buf, ca_list[j]->name, buflen) &&
|
|
(ca_list[j]->name[buflen] == '\0'))
|
|
{
|
|
found = 1;
|
|
break;
|
|
}
|
|
else
|
|
j++;
|
|
}
|
|
if (!found)
|
|
break; /* ignore this entry */
|
|
|
|
algorithms |= ca_list[j]->algorithms;
|
|
mask |= ca_list[j]->mask;
|
|
algo_strength |= ca_list[j]->algo_strength;
|
|
mask_strength |= ca_list[j]->mask_strength;
|
|
|
|
if (!multi) break;
|
|
}
|
|
|
|
/*
|
|
* Ok, we have the rule, now apply it
|
|
*/
|
|
if (rule == CIPHER_SPECIAL)
|
|
{ /* special command */
|
|
ok = 0;
|
|
if ((buflen == 8) &&
|
|
!strncmp(buf, "STRENGTH", 8))
|
|
ok = ssl_cipher_strength_sort(co_list,
|
|
head_p, tail_p);
|
|
else
|
|
SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
|
|
SSL_R_INVALID_COMMAND);
|
|
if (ok == 0)
|
|
retval = 0;
|
|
/*
|
|
* We do not support any "multi" options
|
|
* together with "@", so throw away the
|
|
* rest of the command, if any left, until
|
|
* end or ':' is found.
|
|
*/
|
|
while ((*l != '\0') && ITEM_SEP(*l))
|
|
l++;
|
|
}
|
|
else if (found)
|
|
{
|
|
ssl_cipher_apply_rule(algorithms, mask,
|
|
algo_strength, mask_strength, rule, -1,
|
|
co_list, head_p, tail_p);
|
|
}
|
|
else
|
|
{
|
|
while ((*l != '\0') && ITEM_SEP(*l))
|
|
l++;
|
|
}
|
|
if (*l == '\0') break; /* done */
|
|
}
|
|
|
|
return(retval);
|
|
}
|
|
|
|
STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
|
|
STACK_OF(SSL_CIPHER) **cipher_list,
|
|
STACK_OF(SSL_CIPHER) **cipher_list_by_id,
|
|
const char *rule_str)
|
|
{
|
|
int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
|
|
unsigned long disabled_mask;
|
|
STACK_OF(SSL_CIPHER) *cipherstack;
|
|
const char *rule_p;
|
|
CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
|
|
SSL_CIPHER **ca_list = NULL;
|
|
|
|
/*
|
|
* Return with error if nothing to do.
|
|
*/
|
|
if (rule_str == NULL) return(NULL);
|
|
|
|
if (init_ciphers)
|
|
{
|
|
CRYPTO_w_lock(CRYPTO_LOCK_SSL);
|
|
if (init_ciphers) load_ciphers();
|
|
CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
|
|
}
|
|
|
|
/*
|
|
* To reduce the work to do we only want to process the compiled
|
|
* in algorithms, so we first get the mask of disabled ciphers.
|
|
*/
|
|
disabled_mask = ssl_cipher_get_disabled();
|
|
|
|
/*
|
|
* Now we have to collect the available ciphers from the compiled
|
|
* in ciphers. We cannot get more than the number compiled in, so
|
|
* it is used for allocation.
|
|
*/
|
|
num_of_ciphers = ssl_method->num_ciphers();
|
|
#ifdef KSSL_DEBUG
|
|
printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers);
|
|
#endif /* KSSL_DEBUG */
|
|
co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
|
|
if (co_list == NULL)
|
|
{
|
|
SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
|
|
return(NULL); /* Failure */
|
|
}
|
|
|
|
ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, disabled_mask,
|
|
co_list, &head, &tail);
|
|
|
|
/*
|
|
* We also need cipher aliases for selecting based on the rule_str.
|
|
* There might be two types of entries in the rule_str: 1) names
|
|
* of ciphers themselves 2) aliases for groups of ciphers.
|
|
* For 1) we need the available ciphers and for 2) the cipher
|
|
* groups of cipher_aliases added together in one list (otherwise
|
|
* we would be happy with just the cipher_aliases table).
|
|
*/
|
|
num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
|
|
num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
|
|
ca_list =
|
|
(SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
|
|
if (ca_list == NULL)
|
|
{
|
|
OPENSSL_free(co_list);
|
|
SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
|
|
return(NULL); /* Failure */
|
|
}
|
|
ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mask,
|
|
head);
|
|
|
|
/*
|
|
* If the rule_string begins with DEFAULT, apply the default rule
|
|
* before using the (possibly available) additional rules.
|
|
*/
|
|
ok = 1;
|
|
rule_p = rule_str;
|
|
if (strncmp(rule_str,"DEFAULT",7) == 0)
|
|
{
|
|
ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
|
|
co_list, &head, &tail, ca_list);
|
|
rule_p += 7;
|
|
if (*rule_p == ':')
|
|
rule_p++;
|
|
}
|
|
|
|
if (ok && (strlen(rule_p) > 0))
|
|
ok = ssl_cipher_process_rulestr(rule_p, co_list, &head, &tail,
|
|
ca_list);
|
|
|
|
OPENSSL_free(ca_list); /* Not needed anymore */
|
|
|
|
if (!ok)
|
|
{ /* Rule processing failure */
|
|
OPENSSL_free(co_list);
|
|
return(NULL);
|
|
}
|
|
/*
|
|
* Allocate new "cipherstack" for the result, return with error
|
|
* if we cannot get one.
|
|
*/
|
|
if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
|
|
{
|
|
OPENSSL_free(co_list);
|
|
return(NULL);
|
|
}
|
|
|
|
/*
|
|
* The cipher selection for the list is done. The ciphers are added
|
|
* to the resulting precedence to the STACK_OF(SSL_CIPHER).
|
|
*/
|
|
for (curr = head; curr != NULL; curr = curr->next)
|
|
{
|
|
if (curr->active)
|
|
{
|
|
sk_SSL_CIPHER_push(cipherstack, curr->cipher);
|
|
#ifdef CIPHER_DEBUG
|
|
printf("<%s>\n",curr->cipher->name);
|
|
#endif
|
|
}
|
|
}
|
|
OPENSSL_free(co_list); /* Not needed any longer */
|
|
|
|
/*
|
|
* The following passage is a little bit odd. If pointer variables
|
|
* were supplied to hold STACK_OF(SSL_CIPHER) return information,
|
|
* the old memory pointed to is free()ed. Then, however, the
|
|
* cipher_list entry will be assigned just a copy of the returned
|
|
* cipher stack. For cipher_list_by_id a copy of the cipher stack
|
|
* will be created. See next comment...
|
|
*/
|
|
if (cipher_list != NULL)
|
|
{
|
|
if (*cipher_list != NULL)
|
|
sk_SSL_CIPHER_free(*cipher_list);
|
|
*cipher_list = cipherstack;
|
|
}
|
|
|
|
if (cipher_list_by_id != NULL)
|
|
{
|
|
if (*cipher_list_by_id != NULL)
|
|
sk_SSL_CIPHER_free(*cipher_list_by_id);
|
|
*cipher_list_by_id = sk_SSL_CIPHER_dup(cipherstack);
|
|
}
|
|
|
|
/*
|
|
* Now it is getting really strange. If something failed during
|
|
* the previous pointer assignment or if one of the pointers was
|
|
* not requested, the error condition is met. That might be
|
|
* discussable. The strange thing is however that in this case
|
|
* the memory "ret" pointed to is "free()ed" and hence the pointer
|
|
* cipher_list becomes wild. The memory reserved for
|
|
* cipher_list_by_id however is not "free()ed" and stays intact.
|
|
*/
|
|
if ( (cipher_list_by_id == NULL) ||
|
|
(*cipher_list_by_id == NULL) ||
|
|
(cipher_list == NULL) ||
|
|
(*cipher_list == NULL))
|
|
{
|
|
sk_SSL_CIPHER_free(cipherstack);
|
|
return(NULL);
|
|
}
|
|
|
|
sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
|
|
|
|
return(cipherstack);
|
|
}
|
|
|
|
char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
|
|
{
|
|
int is_export,pkl,kl;
|
|
char *ver,*exp_str;
|
|
char *kx,*au,*enc,*mac;
|
|
unsigned long alg,alg2,alg_s;
|
|
#ifdef KSSL_DEBUG
|
|
static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx\n";
|
|
#else
|
|
static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
|
|
#endif /* KSSL_DEBUG */
|
|
|
|
alg=cipher->algorithms;
|
|
alg_s=cipher->algo_strength;
|
|
alg2=cipher->algorithm2;
|
|
|
|
is_export=SSL_C_IS_EXPORT(cipher);
|
|
pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
|
|
kl=SSL_C_EXPORT_KEYLENGTH(cipher);
|
|
exp_str=is_export?" export":"";
|
|
|
|
if (alg & SSL_SSLV2)
|
|
ver="SSLv2";
|
|
else if (alg & SSL_SSLV3)
|
|
ver="SSLv3";
|
|
else
|
|
ver="unknown";
|
|
|
|
switch (alg&SSL_MKEY_MASK)
|
|
{
|
|
case SSL_kRSA:
|
|
kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
|
|
break;
|
|
case SSL_kDHr:
|
|
kx="DH/RSA";
|
|
break;
|
|
case SSL_kDHd:
|
|
kx="DH/DSS";
|
|
break;
|
|
case SSL_kKRB5: /* VRS */
|
|
case SSL_KRB5: /* VRS */
|
|
kx="KRB5";
|
|
break;
|
|
case SSL_kFZA:
|
|
kx="Fortezza";
|
|
break;
|
|
case SSL_kEDH:
|
|
kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
|
|
break;
|
|
default:
|
|
kx="unknown";
|
|
}
|
|
|
|
switch (alg&SSL_AUTH_MASK)
|
|
{
|
|
case SSL_aRSA:
|
|
au="RSA";
|
|
break;
|
|
case SSL_aDSS:
|
|
au="DSS";
|
|
break;
|
|
case SSL_aDH:
|
|
au="DH";
|
|
break;
|
|
case SSL_aKRB5: /* VRS */
|
|
case SSL_KRB5: /* VRS */
|
|
au="KRB5";
|
|
break;
|
|
case SSL_aFZA:
|
|
case SSL_aNULL:
|
|
au="None";
|
|
break;
|
|
default:
|
|
au="unknown";
|
|
break;
|
|
}
|
|
|
|
switch (alg&SSL_ENC_MASK)
|
|
{
|
|
case SSL_DES:
|
|
enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
|
|
break;
|
|
case SSL_3DES:
|
|
enc="3DES(168)";
|
|
break;
|
|
case SSL_RC4:
|
|
enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
|
|
:((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
|
|
break;
|
|
case SSL_RC2:
|
|
enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
|
|
break;
|
|
case SSL_IDEA:
|
|
enc="IDEA(128)";
|
|
break;
|
|
case SSL_eFZA:
|
|
enc="Fortezza";
|
|
break;
|
|
case SSL_eNULL:
|
|
enc="None";
|
|
break;
|
|
case SSL_AES:
|
|
switch(cipher->strength_bits)
|
|
{
|
|
case 128: enc="AES(128)"; break;
|
|
case 192: enc="AES(192)"; break;
|
|
case 256: enc="AES(256)"; break;
|
|
default: enc="AES(?""?""?)"; break;
|
|
}
|
|
break;
|
|
default:
|
|
enc="unknown";
|
|
break;
|
|
}
|
|
|
|
switch (alg&SSL_MAC_MASK)
|
|
{
|
|
case SSL_MD5:
|
|
mac="MD5";
|
|
break;
|
|
case SSL_SHA1:
|
|
mac="SHA1";
|
|
break;
|
|
default:
|
|
mac="unknown";
|
|
break;
|
|
}
|
|
|
|
if (buf == NULL)
|
|
{
|
|
len=128;
|
|
buf=OPENSSL_malloc(len);
|
|
if (buf == NULL) return("OPENSSL_malloc Error");
|
|
}
|
|
else if (len < 128)
|
|
return("Buffer too small");
|
|
|
|
#ifdef KSSL_DEBUG
|
|
BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg);
|
|
#else
|
|
BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str);
|
|
#endif /* KSSL_DEBUG */
|
|
return(buf);
|
|
}
|
|
|
|
char *SSL_CIPHER_get_version(SSL_CIPHER *c)
|
|
{
|
|
int i;
|
|
|
|
if (c == NULL) return("(NONE)");
|
|
i=(int)(c->id>>24L);
|
|
if (i == 3)
|
|
return("TLSv1/SSLv3");
|
|
else if (i == 2)
|
|
return("SSLv2");
|
|
else
|
|
return("unknown");
|
|
}
|
|
|
|
/* return the actual cipher being used */
|
|
const char *SSL_CIPHER_get_name(SSL_CIPHER *c)
|
|
{
|
|
if (c != NULL)
|
|
return(c->name);
|
|
return("(NONE)");
|
|
}
|
|
|
|
/* number of bits for symmetric cipher */
|
|
int SSL_CIPHER_get_bits(SSL_CIPHER *c, int *alg_bits)
|
|
{
|
|
int ret=0;
|
|
|
|
if (c != NULL)
|
|
{
|
|
if (alg_bits != NULL) *alg_bits = c->alg_bits;
|
|
ret = c->strength_bits;
|
|
}
|
|
return(ret);
|
|
}
|
|
|
|
SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
|
|
{
|
|
SSL_COMP *ctmp;
|
|
int i,nn;
|
|
|
|
if ((n == 0) || (sk == NULL)) return(NULL);
|
|
nn=sk_SSL_COMP_num(sk);
|
|
for (i=0; i<nn; i++)
|
|
{
|
|
ctmp=sk_SSL_COMP_value(sk,i);
|
|
if (ctmp->id == n)
|
|
return(ctmp);
|
|
}
|
|
return(NULL);
|
|
}
|
|
|
|
static int sk_comp_cmp(const SSL_COMP * const *a,
|
|
const SSL_COMP * const *b)
|
|
{
|
|
return((*a)->id-(*b)->id);
|
|
}
|
|
|
|
STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
|
|
{
|
|
return(ssl_comp_methods);
|
|
}
|
|
|
|
int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
|
|
{
|
|
SSL_COMP *comp;
|
|
STACK_OF(SSL_COMP) *sk;
|
|
|
|
if (cm == NULL || cm->type == NID_undef)
|
|
return 1;
|
|
|
|
MemCheck_off();
|
|
comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
|
|
comp->id=id;
|
|
comp->method=cm;
|
|
if (ssl_comp_methods == NULL)
|
|
sk=ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
|
|
else
|
|
sk=ssl_comp_methods;
|
|
if ((sk == NULL) || !sk_SSL_COMP_push(sk,comp))
|
|
{
|
|
MemCheck_on();
|
|
SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
|
|
return(1);
|
|
}
|
|
else
|
|
{
|
|
MemCheck_on();
|
|
return(0);
|
|
}
|
|
}
|