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c7375ac466
Known issue: Blowfish for SSH1 does not work
544 lines
14 KiB
C
544 lines
14 KiB
C
/*
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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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*
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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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* Copyright (c) 1999, 2000 Markus Friedl. All rights reserved.
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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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*
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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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*/
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#include "includes.h"
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RCSID("$OpenBSD: cipher.c,v 1.52 2002/02/18 13:05:32 markus Exp $");
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#include "xmalloc.h"
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#include "log.h"
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#include "cipher.h"
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#include <openssl/md5.h>
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#include "rijndael.h"
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#if OPENSSL_VERSION_NUMBER < 0x00906000L
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#define SSH_OLD_EVP
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#define EVP_CIPHER_CTX_get_app_data(e) ((e)->app_data)
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#endif
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static EVP_CIPHER *evp_ssh1_3des(void);
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static EVP_CIPHER *evp_ssh1_bf(void);
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static EVP_CIPHER *evp_rijndael(void);
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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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EVP_CIPHER *(*evptype)(void);
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} ciphers[] = {
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{ "none", SSH_CIPHER_NONE, 8, 0, EVP_enc_null },
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{ "des", SSH_CIPHER_DES, 8, 8, EVP_des_cbc },
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{ "3des", SSH_CIPHER_3DES, 8, 16, evp_ssh1_3des },
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{ "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, evp_ssh1_bf },
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{ "3des-cbc", SSH_CIPHER_SSH2, 8, 24, EVP_des_ede3_cbc },
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{ "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_bf_cbc },
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{ "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_cast5_cbc },
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{ "arcfour", SSH_CIPHER_SSH2, 8, 16, EVP_rc4 },
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{ "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, evp_rijndael },
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{ "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, evp_rijndael },
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{ "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, evp_rijndael },
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{ NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL }
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};
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/*--*/
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u_int
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cipher_blocksize(Cipher *c)
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{
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return (c->block_size);
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}
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u_int
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cipher_keylen(Cipher *c)
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{
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return (c->key_len);
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}
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u_int
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cipher_mask_ssh1(int client)
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{
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u_int mask = 0;
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mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */
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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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return mask;
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}
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Cipher *
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cipher_by_name(const char *name)
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{
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Cipher *c;
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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;
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return NULL;
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}
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Cipher *
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cipher_by_number(int id)
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{
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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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}
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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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Cipher *c;
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char *ciphers, *cp;
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char *p;
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if (names == NULL || strcmp(names, "") == 0)
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return 0;
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ciphers = cp = xstrdup(names);
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for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0';
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(p = strsep(&cp, CIPHER_SEP))) {
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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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xfree(ciphers);
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return 0;
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} else {
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debug3("cipher ok: %s [%s]", p, names);
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}
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}
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debug3("ciphers ok: [%s]", names);
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xfree(ciphers);
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return 1;
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}
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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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Cipher *c;
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if (name == NULL)
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return -1;
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c = cipher_by_name(name);
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return (c==NULL) ? -1 : c->number;
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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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const u_char *key, u_int keylen, const u_char *iv, u_int ivlen,
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int encrypt)
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{
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static int dowarn = 1;
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#ifdef SSH_OLD_EVP
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EVP_CIPHER *type;
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#else
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const EVP_CIPHER *type;
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#endif
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int klen;
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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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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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type = (*cipher->evptype)();
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EVP_CIPHER_CTX_init(&cc->evp);
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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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(encrypt == CIPHER_ENCRYPT));
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#else
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if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv,
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(encrypt == CIPHER_ENCRYPT)) == 0)
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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);
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if (klen > 0 && keylen != klen) {
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debug("cipher_init: set keylen (%d -> %d)", klen, keylen);
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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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#endif
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}
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void
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cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
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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);
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#ifdef SSH_OLD_EVP
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EVP_Cipher(&cc->evp, dest, (u_char *)src, len);
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#else
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if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0)
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fatal("evp_crypt: EVP_Cipher failed");
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#endif
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}
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void
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cipher_cleanup(CipherContext *cc)
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{
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#ifdef SSH_OLD_EVP
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EVP_CIPHER_CTX_cleanup(&cc->evp);
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#else
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if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0)
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error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed");
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#endif
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}
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/*
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* Selects the cipher, and keys if by computing the MD5 checksum of the
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* passphrase and using the resulting 16 bytes as the key.
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*/
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void
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cipher_set_key_string(CipherContext *cc, Cipher *cipher,
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const char *passphrase, int encrypt)
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{
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MD5_CTX md;
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u_char digest[16];
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MD5_Init(&md);
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MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase));
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MD5_Final(digest, &md);
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cipher_init(cc, cipher, digest, 16, NULL, 0, encrypt);
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memset(digest, 0, sizeof(digest));
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memset(&md, 0, sizeof(md));
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}
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/* Implementations for other non-EVP ciphers */
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/*
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* This is used by SSH1:
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*
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* What kind of triple DES are these 2 routines?
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*
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* Why is there a redundant initialization vector?
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*
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* If only iv3 was used, then, this would till effect have been
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* outer-cbc. However, there is also a private iv1 == iv2 which
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* perhaps makes differential analysis easier. On the other hand, the
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* private iv1 probably makes the CRC-32 attack ineffective. This is a
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* result of that there is no longer any known iv1 to use when
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* choosing the X block.
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*/
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struct ssh1_3des_ctx
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{
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EVP_CIPHER_CTX k1, k2, k3;
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};
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static int
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ssh1_3des_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv,
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int enc)
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{
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struct ssh1_3des_ctx *c;
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u_char *k1, *k2, *k3;
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
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c = xmalloc(sizeof(*c));
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EVP_CIPHER_CTX_set_app_data(ctx, c);
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}
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if (key == NULL)
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return (1);
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if (enc == -1)
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enc = ctx->encrypt;
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k1 = k2 = k3 = (u_char *) key;
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k2 += 8;
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if (EVP_CIPHER_CTX_key_length(ctx) >= 16+8) {
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if (enc)
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k3 += 16;
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else
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k1 += 16;
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}
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EVP_CIPHER_CTX_init(&c->k1);
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EVP_CIPHER_CTX_init(&c->k2);
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EVP_CIPHER_CTX_init(&c->k3);
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#ifdef SSH_OLD_EVP
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EVP_CipherInit(&c->k1, EVP_des_cbc(), k1, NULL, enc);
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EVP_CipherInit(&c->k2, EVP_des_cbc(), k2, NULL, !enc);
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EVP_CipherInit(&c->k3, EVP_des_cbc(), k3, NULL, enc);
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#else
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if (EVP_CipherInit(&c->k1, EVP_des_cbc(), k1, NULL, enc) == 0 ||
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EVP_CipherInit(&c->k2, EVP_des_cbc(), k2, NULL, !enc) == 0 ||
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EVP_CipherInit(&c->k3, EVP_des_cbc(), k3, NULL, enc) == 0) {
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memset(c, 0, sizeof(*c));
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xfree(c);
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EVP_CIPHER_CTX_set_app_data(ctx, NULL);
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return (0);
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}
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#endif
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return (1);
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}
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static int
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ssh1_3des_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, u_int len)
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{
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struct ssh1_3des_ctx *c;
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
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error("ssh1_3des_cbc: no context");
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return (0);
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}
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#ifdef SSH_OLD_EVP
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EVP_Cipher(&c->k1, dest, (u_char *)src, len);
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EVP_Cipher(&c->k2, dest, dest, len);
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EVP_Cipher(&c->k3, dest, dest, len);
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#else
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if (EVP_Cipher(&c->k1, dest, (u_char *)src, len) == 0 ||
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EVP_Cipher(&c->k2, dest, dest, len) == 0 ||
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EVP_Cipher(&c->k3, dest, dest, len) == 0)
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return (0);
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#endif
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return (1);
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}
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static int
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ssh1_3des_cleanup(EVP_CIPHER_CTX *ctx)
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{
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struct ssh1_3des_ctx *c;
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) {
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memset(c, 0, sizeof(*c));
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xfree(c);
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EVP_CIPHER_CTX_set_app_data(ctx, NULL);
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}
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return (1);
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}
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static EVP_CIPHER *
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evp_ssh1_3des(void)
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{
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static EVP_CIPHER ssh1_3des;
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memset(&ssh1_3des, 0, sizeof(EVP_CIPHER));
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ssh1_3des.nid = NID_undef;
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ssh1_3des.block_size = 8;
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ssh1_3des.iv_len = 0;
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ssh1_3des.key_len = 16;
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ssh1_3des.init = ssh1_3des_init;
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ssh1_3des.cleanup = ssh1_3des_cleanup;
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ssh1_3des.do_cipher = ssh1_3des_cbc;
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#ifndef SSH_OLD_EVP
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ssh1_3des.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH;
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#endif
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return (&ssh1_3des);
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}
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/*
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* SSH1 uses a variation on Blowfish, all bytes must be swapped before
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* and after encryption/decryption. Thus the swap_bytes stuff (yuk).
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*/
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static void
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swap_bytes(const u_char *src, u_char *dst, int n)
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{
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u_char c[4];
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/* Process 4 bytes every lap. */
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for (n = n / 4; n > 0; n--) {
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c[3] = *src++;
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c[2] = *src++;
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c[1] = *src++;
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c[0] = *src++;
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*dst++ = c[0];
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*dst++ = c[1];
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*dst++ = c[2];
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*dst++ = c[3];
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}
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}
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static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, const u_char *, u_int) = NULL;
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static int
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bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, u_int len)
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{
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int ret;
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swap_bytes(in, out, len);
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ret = (*orig_bf)(ctx, out, out, len);
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swap_bytes(out, out, len);
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return (ret);
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}
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static EVP_CIPHER *
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evp_ssh1_bf(void)
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{
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static EVP_CIPHER ssh1_bf;
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memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER));
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orig_bf = ssh1_bf.do_cipher;
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ssh1_bf.nid = NID_undef;
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ssh1_bf.do_cipher = bf_ssh1_cipher;
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ssh1_bf.key_len = 32;
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return (&ssh1_bf);
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}
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/* RIJNDAEL */
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#define RIJNDAEL_BLOCKSIZE 16
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struct ssh_rijndael_ctx
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{
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rijndael_ctx r_ctx;
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u_char r_iv[RIJNDAEL_BLOCKSIZE];
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};
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static int
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ssh_rijndael_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv,
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int enc)
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{
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struct ssh_rijndael_ctx *c;
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
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c = xmalloc(sizeof(*c));
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EVP_CIPHER_CTX_set_app_data(ctx, c);
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}
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if (key != NULL) {
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if (enc == -1)
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enc = ctx->encrypt;
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rijndael_set_key(&c->r_ctx, (u_char *)key,
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8*EVP_CIPHER_CTX_key_length(ctx), enc);
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}
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if (iv != NULL)
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memcpy(c->r_iv, iv, RIJNDAEL_BLOCKSIZE);
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return (1);
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}
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static int
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ssh_rijndael_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src,
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u_int len)
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{
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struct ssh_rijndael_ctx *c;
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u_char buf[RIJNDAEL_BLOCKSIZE];
|
|
u_char *cprev, *cnow, *plain, *ivp;
|
|
int i, j, blocks = len / RIJNDAEL_BLOCKSIZE;
|
|
|
|
if (len == 0)
|
|
return (1);
|
|
if (len % RIJNDAEL_BLOCKSIZE)
|
|
fatal("ssh_rijndael_cbc: bad len %d", len);
|
|
if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
|
|
error("ssh_rijndael_cbc: no context");
|
|
return (0);
|
|
}
|
|
if (ctx->encrypt) {
|
|
cnow = dest;
|
|
plain = (u_char *)src;
|
|
cprev = c->r_iv;
|
|
for (i = 0; i < blocks; i++, plain+=RIJNDAEL_BLOCKSIZE,
|
|
cnow+=RIJNDAEL_BLOCKSIZE) {
|
|
for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++)
|
|
buf[j] = plain[j] ^ cprev[j];
|
|
rijndael_encrypt(&c->r_ctx, buf, cnow);
|
|
cprev = cnow;
|
|
}
|
|
memcpy(c->r_iv, cprev, RIJNDAEL_BLOCKSIZE);
|
|
} else {
|
|
cnow = (u_char *) (src+len-RIJNDAEL_BLOCKSIZE);
|
|
plain = dest+len-RIJNDAEL_BLOCKSIZE;
|
|
|
|
memcpy(buf, cnow, RIJNDAEL_BLOCKSIZE);
|
|
for (i = blocks; i > 0; i--, cnow-=RIJNDAEL_BLOCKSIZE,
|
|
plain-=RIJNDAEL_BLOCKSIZE) {
|
|
rijndael_decrypt(&c->r_ctx, cnow, plain);
|
|
ivp = (i == 1) ? c->r_iv : cnow-RIJNDAEL_BLOCKSIZE;
|
|
for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++)
|
|
plain[j] ^= ivp[j];
|
|
}
|
|
memcpy(c->r_iv, buf, RIJNDAEL_BLOCKSIZE);
|
|
}
|
|
return (1);
|
|
}
|
|
static int
|
|
ssh_rijndael_cleanup(EVP_CIPHER_CTX *ctx)
|
|
{
|
|
struct ssh_rijndael_ctx *c;
|
|
|
|
if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) {
|
|
memset(c, 0, sizeof(*c));
|
|
xfree(c);
|
|
EVP_CIPHER_CTX_set_app_data(ctx, NULL);
|
|
}
|
|
return (1);
|
|
}
|
|
static EVP_CIPHER *
|
|
evp_rijndael(void)
|
|
{
|
|
static EVP_CIPHER rijndal_cbc;
|
|
|
|
memset(&rijndal_cbc, 0, sizeof(EVP_CIPHER));
|
|
rijndal_cbc.nid = NID_undef;
|
|
rijndal_cbc.block_size = RIJNDAEL_BLOCKSIZE;
|
|
rijndal_cbc.iv_len = RIJNDAEL_BLOCKSIZE;
|
|
rijndal_cbc.key_len = 16;
|
|
rijndal_cbc.init = ssh_rijndael_init;
|
|
rijndal_cbc.cleanup = ssh_rijndael_cleanup;
|
|
rijndal_cbc.do_cipher = ssh_rijndael_cbc;
|
|
#ifndef SSH_OLD_EVP
|
|
rijndal_cbc.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH |
|
|
EVP_CIPH_ALWAYS_CALL_INIT;
|
|
#endif
|
|
return (&rijndal_cbc);
|
|
}
|