2000-02-24 14:29:47 +00:00
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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2000-05-15 05:24:25 +00:00
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*
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2000-09-10 09:35:38 +00:00
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*
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*
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* Copyright (c) 1999 Niels Provos. All rights reserved.
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2002-03-18 10:09:43 +00:00
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* Copyright (c) 1999, 2000 Markus Friedl. All rights reserved.
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2000-09-10 09:35:38 +00:00
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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 above 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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2000-05-15 05:24:25 +00:00
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*
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2000-09-10 09:35:38 +00:00
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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2000-02-24 14:29:47 +00:00
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*/
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#include "includes.h"
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2005-09-03 07:04:25 +00:00
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RCSID("$OpenBSD: cipher.c,v 1.77 2005/07/16 01:35:24 djm Exp $");
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2000-02-24 14:29:47 +00:00
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2000-05-15 05:24:25 +00:00
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#include "xmalloc.h"
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2001-05-04 04:14:23 +00:00
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#include "log.h"
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#include "cipher.h"
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2000-02-24 14:29:47 +00:00
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2000-02-25 01:53:12 +00:00
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#include <openssl/md5.h>
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2002-03-18 10:09:43 +00:00
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2005-09-03 07:04:25 +00:00
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/* compatibility with old or broken OpenSSL versions */
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#include "openbsd-compat/openssl-compat.h"
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2004-02-26 10:52:33 +00:00
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2004-01-07 11:16:27 +00:00
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extern const EVP_CIPHER *evp_ssh1_bf(void);
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extern const EVP_CIPHER *evp_ssh1_3des(void);
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extern void ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int);
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extern const EVP_CIPHER *evp_aes_128_ctr(void);
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extern void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, int, u_char *, u_int);
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2002-03-18 10:09:43 +00:00
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struct Cipher {
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char *name;
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int number; /* for ssh1 only */
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u_int block_size;
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u_int key_len;
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2005-09-03 07:04:25 +00:00
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u_int discard_len;
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2002-06-23 16:09:08 +00:00
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const EVP_CIPHER *(*evptype)(void);
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2002-03-18 10:09:43 +00:00
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} ciphers[] = {
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2005-09-03 07:04:25 +00:00
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{ "none", SSH_CIPHER_NONE, 8, 0, 0, EVP_enc_null },
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{ "des", SSH_CIPHER_DES, 8, 8, 0, EVP_des_cbc },
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{ "3des", SSH_CIPHER_3DES, 8, 16, 0, evp_ssh1_3des },
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{ "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, 0, evp_ssh1_bf },
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{ "3des-cbc", SSH_CIPHER_SSH2, 8, 24, 0, EVP_des_ede3_cbc },
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{ "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, 0, EVP_bf_cbc },
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{ "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, 0, EVP_cast5_cbc },
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{ "arcfour", SSH_CIPHER_SSH2, 8, 16, 0, EVP_rc4 },
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{ "arcfour128", SSH_CIPHER_SSH2, 8, 16, 1536, EVP_rc4 },
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{ "arcfour256", SSH_CIPHER_SSH2, 8, 32, 1536, EVP_rc4 },
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{ "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, 0, EVP_aes_128_cbc },
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{ "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, 0, EVP_aes_192_cbc },
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{ "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, 0, EVP_aes_256_cbc },
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2002-06-23 16:09:08 +00:00
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{ "rijndael-cbc@lysator.liu.se",
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2005-09-03 07:04:25 +00:00
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SSH_CIPHER_SSH2, 16, 32, 0, EVP_aes_256_cbc },
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{ "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, evp_aes_128_ctr },
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{ "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, evp_aes_128_ctr },
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{ "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, evp_aes_128_ctr },
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#ifdef USE_CIPHER_ACSS
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{ "acss@openssh.org", SSH_CIPHER_SSH2, 16, 5, 0, EVP_acss },
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2004-01-07 11:16:27 +00:00
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#endif
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2005-09-03 07:04:25 +00:00
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{ NULL, SSH_CIPHER_INVALID, 0, 0, 0, NULL }
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2002-03-18 10:09:43 +00:00
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};
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2000-02-24 14:29:47 +00:00
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2002-03-18 10:09:43 +00:00
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/*--*/
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2000-12-05 02:55:12 +00:00
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2002-06-23 16:09:08 +00:00
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u_int
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2004-02-26 10:52:33 +00:00
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cipher_blocksize(const Cipher *c)
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2000-12-05 02:55:12 +00:00
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{
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2002-03-18 10:09:43 +00:00
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return (c->block_size);
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2000-12-05 02:55:12 +00:00
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}
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2002-06-29 11:48:59 +00:00
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2002-06-23 16:09:08 +00:00
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u_int
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2004-02-26 10:52:33 +00:00
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cipher_keylen(const Cipher *c)
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2000-12-05 02:55:12 +00:00
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{
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2002-03-18 10:09:43 +00:00
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return (c->key_len);
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2000-12-05 02:55:12 +00:00
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}
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2002-06-29 11:48:59 +00:00
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2002-06-23 16:09:08 +00:00
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u_int
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2004-02-26 10:52:33 +00:00
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cipher_get_number(const Cipher *c)
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2002-06-23 16:09:08 +00:00
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{
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return (c->number);
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}
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2000-12-05 02:55:12 +00:00
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2001-05-04 04:14:23 +00:00
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u_int
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2000-12-05 02:55:12 +00:00
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cipher_mask_ssh1(int client)
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2000-05-15 05:24:25 +00:00
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{
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2001-05-04 04:14:23 +00:00
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u_int mask = 0;
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2002-03-18 10:09:43 +00:00
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mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */
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2000-12-05 02:55:12 +00:00
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mask |= 1 << SSH_CIPHER_BLOWFISH;
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if (client) {
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mask |= 1 << SSH_CIPHER_DES;
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}
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2000-05-15 05:24:25 +00:00
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return mask;
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}
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2000-12-05 02:55:12 +00:00
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Cipher *
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cipher_by_name(const char *name)
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2000-05-15 05:24:25 +00:00
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{
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2000-12-05 02:55:12 +00:00
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Cipher *c;
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for (c = ciphers; c->name != NULL; c++)
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2005-06-05 15:46:09 +00:00
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if (strcmp(c->name, name) == 0)
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2000-12-05 02:55:12 +00:00
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return c;
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return NULL;
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2000-05-15 05:24:25 +00:00
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}
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2000-02-24 14:29:47 +00:00
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2000-12-05 02:55:12 +00:00
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Cipher *
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cipher_by_number(int id)
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2000-02-24 14:29:47 +00:00
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{
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2000-12-05 02:55:12 +00:00
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Cipher *c;
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for (c = ciphers; c->name != NULL; c++)
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if (c->number == id)
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return c;
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return NULL;
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2000-02-24 14:29:47 +00:00
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}
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2000-05-15 05:24:25 +00:00
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#define CIPHER_SEP ","
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int
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ciphers_valid(const char *names)
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{
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2000-12-05 02:55:12 +00:00
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Cipher *c;
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2004-10-28 16:11:31 +00:00
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char *cipher_list, *cp;
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2000-05-15 05:24:25 +00:00
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char *p;
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2000-06-03 09:58:15 +00:00
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if (names == NULL || strcmp(names, "") == 0)
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2000-05-15 05:24:25 +00:00
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return 0;
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2004-10-28 16:11:31 +00:00
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cipher_list = cp = xstrdup(names);
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2000-12-05 02:55:12 +00:00
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for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0';
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2002-03-18 10:09:43 +00:00
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(p = strsep(&cp, CIPHER_SEP))) {
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2000-12-05 02:55:12 +00:00
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c = cipher_by_name(p);
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if (c == NULL || c->number != SSH_CIPHER_SSH2) {
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debug("bad cipher %s [%s]", p, names);
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2004-10-28 16:11:31 +00:00
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xfree(cipher_list);
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2000-05-15 05:24:25 +00:00
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return 0;
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2000-12-05 02:55:12 +00:00
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} else {
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debug3("cipher ok: %s [%s]", p, names);
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2000-05-15 05:24:25 +00:00
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}
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}
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2000-12-05 02:55:12 +00:00
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debug3("ciphers ok: [%s]", names);
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2004-10-28 16:11:31 +00:00
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xfree(cipher_list);
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2000-05-15 05:24:25 +00:00
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return 1;
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}
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2000-02-24 14:29:47 +00:00
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/*
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* Parses the name of the cipher. Returns the number of the corresponding
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* cipher, or -1 on error.
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*/
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int
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cipher_number(const char *name)
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{
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2000-12-05 02:55:12 +00:00
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Cipher *c;
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2000-06-03 09:58:15 +00:00
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if (name == NULL)
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return -1;
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2005-06-05 15:46:09 +00:00
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for (c = ciphers; c->name != NULL; c++)
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if (strcasecmp(c->name, name) == 0)
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return c->number;
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return -1;
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2000-12-05 02:55:12 +00:00
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}
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char *
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cipher_name(int id)
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{
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Cipher *c = cipher_by_number(id);
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return (c==NULL) ? "<unknown>" : c->name;
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}
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void
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cipher_init(CipherContext *cc, Cipher *cipher,
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2002-03-18 10:09:43 +00:00
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const u_char *key, u_int keylen, const u_char *iv, u_int ivlen,
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2004-10-28 16:11:31 +00:00
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int do_encrypt)
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2000-12-05 02:55:12 +00:00
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{
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2002-03-18 10:09:43 +00:00
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static int dowarn = 1;
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2002-06-27 22:42:11 +00:00
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#ifdef SSH_OLD_EVP
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EVP_CIPHER *type;
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#else
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2002-03-18 10:09:43 +00:00
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const EVP_CIPHER *type;
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int klen;
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2005-09-03 07:04:25 +00:00
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#endif
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u_char *junk, *discard;
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2002-03-18 10:09:43 +00:00
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if (cipher->number == SSH_CIPHER_DES) {
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if (dowarn) {
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error("Warning: use of DES is strongly discouraged "
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"due to cryptographic weaknesses");
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dowarn = 0;
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}
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if (keylen > 8)
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keylen = 8;
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}
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cc->plaintext = (cipher->number == SSH_CIPHER_NONE);
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2000-12-05 02:55:12 +00:00
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if (keylen < cipher->key_len)
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fatal("cipher_init: key length %d is insufficient for %s.",
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keylen, cipher->name);
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if (iv != NULL && ivlen < cipher->block_size)
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fatal("cipher_init: iv length %d is insufficient for %s.",
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ivlen, cipher->name);
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cc->cipher = cipher;
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2002-03-18 10:09:43 +00:00
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type = (*cipher->evptype)();
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EVP_CIPHER_CTX_init(&cc->evp);
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2002-06-27 22:42:11 +00:00
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#ifdef SSH_OLD_EVP
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if (type->key_len > 0 && type->key_len != keylen) {
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debug("cipher_init: set keylen (%d -> %d)",
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type->key_len, keylen);
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type->key_len = keylen;
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}
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EVP_CipherInit(&cc->evp, type, (u_char *)key, (u_char *)iv,
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2004-10-28 16:11:31 +00:00
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(do_encrypt == CIPHER_ENCRYPT));
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2002-06-27 22:42:11 +00:00
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#else
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2002-03-18 10:09:43 +00:00
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if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv,
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2004-10-28 16:11:31 +00:00
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(do_encrypt == CIPHER_ENCRYPT)) == 0)
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2002-03-18 10:09:43 +00:00
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fatal("cipher_init: EVP_CipherInit failed for %s",
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cipher->name);
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klen = EVP_CIPHER_CTX_key_length(&cc->evp);
|
2005-09-03 07:04:25 +00:00
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if (klen > 0 && keylen != (u_int)klen) {
|
2003-04-23 17:13:13 +00:00
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debug2("cipher_init: set keylen (%d -> %d)", klen, keylen);
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2002-03-18 10:09:43 +00:00
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if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0)
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fatal("cipher_init: set keylen failed (%d -> %d)",
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klen, keylen);
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}
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if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0)
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fatal("cipher_init: EVP_CipherInit: set key failed for %s",
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cipher->name);
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2002-06-27 22:42:11 +00:00
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#endif
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2005-09-03 07:04:25 +00:00
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if (cipher->discard_len > 0) {
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junk = xmalloc(cipher->discard_len);
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discard = xmalloc(cipher->discard_len);
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if (EVP_Cipher(&cc->evp, discard, junk,
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cipher->discard_len) == 0)
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fatal("evp_crypt: EVP_Cipher failed during discard");
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memset(discard, 0, cipher->discard_len);
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xfree(junk);
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xfree(discard);
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}
|
2000-12-05 02:55:12 +00:00
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}
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void
|
2002-03-18 10:09:43 +00:00
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cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
|
2000-12-05 02:55:12 +00:00
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{
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if (len % cc->cipher->block_size)
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fatal("cipher_encrypt: bad plaintext length %d", len);
|
2002-03-18 10:09:43 +00:00
|
|
|
if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0)
|
|
|
|
fatal("evp_crypt: EVP_Cipher failed");
|
2000-12-05 02:55:12 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
2002-03-18 10:09:43 +00:00
|
|
|
cipher_cleanup(CipherContext *cc)
|
2000-12-05 02:55:12 +00:00
|
|
|
{
|
2002-03-18 10:09:43 +00:00
|
|
|
if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0)
|
|
|
|
error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed");
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Selects the cipher, and keys if by computing the MD5 checksum of the
|
|
|
|
* passphrase and using the resulting 16 bytes as the key.
|
|
|
|
*/
|
|
|
|
|
2000-05-15 05:24:25 +00:00
|
|
|
void
|
2000-12-05 02:55:12 +00:00
|
|
|
cipher_set_key_string(CipherContext *cc, Cipher *cipher,
|
2004-10-28 16:11:31 +00:00
|
|
|
const char *passphrase, int do_encrypt)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
MD5_CTX md;
|
2001-05-04 04:14:23 +00:00
|
|
|
u_char digest[16];
|
2000-02-24 14:29:47 +00:00
|
|
|
|
|
|
|
MD5_Init(&md);
|
2000-12-05 02:55:12 +00:00
|
|
|
MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase));
|
2000-02-24 14:29:47 +00:00
|
|
|
MD5_Final(digest, &md);
|
|
|
|
|
2004-10-28 16:11:31 +00:00
|
|
|
cipher_init(cc, cipher, digest, 16, NULL, 0, do_encrypt);
|
2000-02-24 14:29:47 +00:00
|
|
|
|
|
|
|
memset(digest, 0, sizeof(digest));
|
|
|
|
memset(&md, 0, sizeof(md));
|
|
|
|
}
|
2002-03-18 10:09:43 +00:00
|
|
|
|
2002-06-23 16:09:08 +00:00
|
|
|
/*
|
|
|
|
* Exports an IV from the CipherContext required to export the key
|
|
|
|
* state back from the unprivileged child to the privileged parent
|
|
|
|
* process.
|
|
|
|
*/
|
|
|
|
|
|
|
|
int
|
2004-02-26 10:52:33 +00:00
|
|
|
cipher_get_keyiv_len(const CipherContext *cc)
|
2002-06-23 16:09:08 +00:00
|
|
|
{
|
|
|
|
Cipher *c = cc->cipher;
|
|
|
|
int ivlen;
|
|
|
|
|
|
|
|
if (c->number == SSH_CIPHER_3DES)
|
|
|
|
ivlen = 24;
|
|
|
|
else
|
|
|
|
ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp);
|
|
|
|
return (ivlen);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len)
|
|
|
|
{
|
|
|
|
Cipher *c = cc->cipher;
|
|
|
|
int evplen;
|
|
|
|
|
|
|
|
switch (c->number) {
|
|
|
|
case SSH_CIPHER_SSH2:
|
|
|
|
case SSH_CIPHER_DES:
|
|
|
|
case SSH_CIPHER_BLOWFISH:
|
|
|
|
evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
|
2005-09-03 07:04:25 +00:00
|
|
|
if (evplen <= 0)
|
2002-06-23 16:09:08 +00:00
|
|
|
return;
|
2005-09-03 07:04:25 +00:00
|
|
|
if ((u_int)evplen != len)
|
2002-06-23 16:09:08 +00:00
|
|
|
fatal("%s: wrong iv length %d != %d", __func__,
|
|
|
|
evplen, len);
|
2006-03-22 20:41:37 +00:00
|
|
|
#ifdef USE_BUILTIN_RIJNDAEL
|
2004-01-07 11:16:27 +00:00
|
|
|
if (c->evptype == evp_rijndael)
|
|
|
|
ssh_rijndael_iv(&cc->evp, 0, iv, len);
|
|
|
|
else
|
2002-06-23 16:09:08 +00:00
|
|
|
#endif
|
2004-01-07 11:16:27 +00:00
|
|
|
if (c->evptype == evp_aes_128_ctr)
|
|
|
|
ssh_aes_ctr_iv(&cc->evp, 0, iv, len);
|
|
|
|
else
|
|
|
|
memcpy(iv, cc->evp.iv, len);
|
|
|
|
break;
|
|
|
|
case SSH_CIPHER_3DES:
|
|
|
|
ssh1_3des_iv(&cc->evp, 0, iv, 24);
|
2002-06-23 16:09:08 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
fatal("%s: bad cipher %d", __func__, c->number);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
cipher_set_keyiv(CipherContext *cc, u_char *iv)
|
|
|
|
{
|
|
|
|
Cipher *c = cc->cipher;
|
|
|
|
int evplen = 0;
|
|
|
|
|
|
|
|
switch (c->number) {
|
|
|
|
case SSH_CIPHER_SSH2:
|
|
|
|
case SSH_CIPHER_DES:
|
|
|
|
case SSH_CIPHER_BLOWFISH:
|
|
|
|
evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
|
|
|
|
if (evplen == 0)
|
|
|
|
return;
|
2006-03-22 20:41:37 +00:00
|
|
|
#ifdef USE_BUILTIN_RIJNDAEL
|
2004-01-07 11:16:27 +00:00
|
|
|
if (c->evptype == evp_rijndael)
|
|
|
|
ssh_rijndael_iv(&cc->evp, 1, iv, evplen);
|
|
|
|
else
|
2002-06-23 16:09:08 +00:00
|
|
|
#endif
|
2004-01-07 11:16:27 +00:00
|
|
|
if (c->evptype == evp_aes_128_ctr)
|
|
|
|
ssh_aes_ctr_iv(&cc->evp, 1, iv, evplen);
|
|
|
|
else
|
|
|
|
memcpy(cc->evp.iv, iv, evplen);
|
|
|
|
break;
|
|
|
|
case SSH_CIPHER_3DES:
|
|
|
|
ssh1_3des_iv(&cc->evp, 1, iv, 24);
|
2002-06-23 16:09:08 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
fatal("%s: bad cipher %d", __func__, c->number);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#if OPENSSL_VERSION_NUMBER < 0x00907000L
|
|
|
|
#define EVP_X_STATE(evp) &(evp).c
|
|
|
|
#define EVP_X_STATE_LEN(evp) sizeof((evp).c)
|
|
|
|
#else
|
|
|
|
#define EVP_X_STATE(evp) (evp).cipher_data
|
|
|
|
#define EVP_X_STATE_LEN(evp) (evp).cipher->ctx_size
|
|
|
|
#endif
|
|
|
|
|
|
|
|
int
|
2004-02-26 10:52:33 +00:00
|
|
|
cipher_get_keycontext(const CipherContext *cc, u_char *dat)
|
2002-06-23 16:09:08 +00:00
|
|
|
{
|
|
|
|
Cipher *c = cc->cipher;
|
|
|
|
int plen = 0;
|
|
|
|
|
2004-02-26 10:52:33 +00:00
|
|
|
if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) {
|
2002-06-23 16:09:08 +00:00
|
|
|
plen = EVP_X_STATE_LEN(cc->evp);
|
|
|
|
if (dat == NULL)
|
|
|
|
return (plen);
|
|
|
|
memcpy(dat, EVP_X_STATE(cc->evp), plen);
|
|
|
|
}
|
|
|
|
return (plen);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
cipher_set_keycontext(CipherContext *cc, u_char *dat)
|
|
|
|
{
|
|
|
|
Cipher *c = cc->cipher;
|
|
|
|
int plen;
|
|
|
|
|
2004-02-26 10:52:33 +00:00
|
|
|
if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) {
|
2002-06-23 16:09:08 +00:00
|
|
|
plen = EVP_X_STATE_LEN(cc->evp);
|
|
|
|
memcpy(EVP_X_STATE(cc->evp), dat, plen);
|
|
|
|
}
|
|
|
|
}
|