$FreeBSD$ tags and man page dates. Add a post-merge script which reapplies these changes. Run both scripts to normalize the existing code base. As a result, many files which should have had $FreeBSD$ tags but didn't now have them. Partly rewrite the upgrade instructions and remove the now outdated list of tricks.
590 lines
15 KiB
C
590 lines
15 KiB
C
/* $OpenBSD: cipher.c,v 1.94 2014/01/25 10:12:50 dtucker Exp $ */
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/* $FreeBSD$ */
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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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*
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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("$FreeBSD$");
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#include <sys/types.h>
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#include <openssl/md5.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include "xmalloc.h"
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#include "log.h"
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#include "misc.h"
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#include "cipher.h"
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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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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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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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u_int iv_len; /* defaults to block_size */
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u_int auth_len;
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u_int discard_len;
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u_int flags;
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#define CFLAG_CBC (1<<0)
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#define CFLAG_CHACHAPOLY (1<<1)
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const EVP_CIPHER *(*evptype)(void);
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};
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static const struct Cipher ciphers[] = {
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{ "none", SSH_CIPHER_NONE, 8, 0, 0, 0, 0, 0, EVP_enc_null },
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{ "des", SSH_CIPHER_DES, 8, 8, 0, 0, 0, 1, EVP_des_cbc },
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{ "3des", SSH_CIPHER_3DES, 8, 16, 0, 0, 0, 1, evp_ssh1_3des },
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{ "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, 0, 0, 0, 1, evp_ssh1_bf },
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{ "3des-cbc", SSH_CIPHER_SSH2, 8, 24, 0, 0, 0, 1, EVP_des_ede3_cbc },
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{ "blowfish-cbc",
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SSH_CIPHER_SSH2, 8, 16, 0, 0, 0, 1, EVP_bf_cbc },
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{ "cast128-cbc",
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SSH_CIPHER_SSH2, 8, 16, 0, 0, 0, 1, EVP_cast5_cbc },
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{ "arcfour", SSH_CIPHER_SSH2, 8, 16, 0, 0, 0, 0, EVP_rc4 },
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{ "arcfour128", SSH_CIPHER_SSH2, 8, 16, 0, 0, 1536, 0, EVP_rc4 },
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{ "arcfour256", SSH_CIPHER_SSH2, 8, 32, 0, 0, 1536, 0, EVP_rc4 },
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{ "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, 0, 0, 0, 1, EVP_aes_128_cbc },
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{ "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, 0, 0, 0, 1, EVP_aes_192_cbc },
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{ "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, 0, 0, 0, 1, EVP_aes_256_cbc },
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{ "rijndael-cbc@lysator.liu.se",
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SSH_CIPHER_SSH2, 16, 32, 0, 0, 0, 1, EVP_aes_256_cbc },
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{ "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, 0, 0, 0, EVP_aes_128_ctr },
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{ "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, 0, 0, 0, EVP_aes_192_ctr },
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{ "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, 0, 0, 0, EVP_aes_256_ctr },
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#ifdef OPENSSL_HAVE_EVPGCM
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{ "aes128-gcm@openssh.com",
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SSH_CIPHER_SSH2, 16, 16, 12, 16, 0, 0, EVP_aes_128_gcm },
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{ "aes256-gcm@openssh.com",
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SSH_CIPHER_SSH2, 16, 32, 12, 16, 0, 0, EVP_aes_256_gcm },
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#endif
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{ "chacha20-poly1305@openssh.com",
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SSH_CIPHER_SSH2, 8, 64, 0, 16, 0, CFLAG_CHACHAPOLY, NULL },
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{ NULL, SSH_CIPHER_INVALID, 0, 0, 0, 0, 0, 0, NULL }
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};
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/*--*/
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/* Returns a list of supported ciphers separated by the specified char. */
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char *
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cipher_alg_list(char sep, int auth_only)
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{
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char *ret = NULL;
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size_t nlen, rlen = 0;
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const Cipher *c;
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for (c = ciphers; c->name != NULL; c++) {
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if (c->number != SSH_CIPHER_SSH2)
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continue;
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if (auth_only && c->auth_len == 0)
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continue;
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if (ret != NULL)
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ret[rlen++] = sep;
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nlen = strlen(c->name);
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ret = xrealloc(ret, 1, rlen + nlen + 2);
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memcpy(ret + rlen, c->name, nlen + 1);
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rlen += nlen;
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}
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return ret;
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}
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u_int
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cipher_blocksize(const 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(const 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_seclen(const Cipher *c)
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{
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if (strcmp("3des-cbc", c->name) == 0)
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return 14;
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return cipher_keylen(c);
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}
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u_int
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cipher_authlen(const Cipher *c)
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{
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return (c->auth_len);
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}
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u_int
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cipher_ivlen(const Cipher *c)
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{
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/*
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* Default is cipher block size, except for chacha20+poly1305 that
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* needs no IV. XXX make iv_len == -1 default?
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*/
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return (c->iv_len != 0 || (c->flags & CFLAG_CHACHAPOLY) != 0) ?
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c->iv_len : c->block_size;
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}
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u_int
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cipher_get_number(const Cipher *c)
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{
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return (c->number);
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}
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u_int
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cipher_is_cbc(const Cipher *c)
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{
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return (c->flags & CFLAG_CBC) != 0;
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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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const Cipher *
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cipher_by_name(const char *name)
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{
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const Cipher *c;
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for (c = ciphers; c->name != NULL; c++)
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if (strcmp(c->name, name) == 0)
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return c;
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return NULL;
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}
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const Cipher *
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cipher_by_number(int id)
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{
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const 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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const Cipher *c;
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char *cipher_list, *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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cipher_list = 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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#ifdef NONE_CIPHER_ENABLED
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if (c == NULL || (c->number != SSH_CIPHER_SSH2 &&
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c->number != SSH_CIPHER_NONE)) {
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#else
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if (c == NULL || (c->number != SSH_CIPHER_SSH2)) {
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#endif
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debug("bad cipher %s [%s]", p, names);
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free(cipher_list);
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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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free(cipher_list);
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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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const Cipher *c;
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if (name == NULL)
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return -1;
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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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}
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char *
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cipher_name(int id)
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{
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const 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, const 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 do_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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int klen;
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#endif
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u_char *junk, *discard;
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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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cc->encrypt = do_encrypt;
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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_ivlen(cipher))
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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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if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) {
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chachapoly_init(&cc->cp_ctx, key, keylen);
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return;
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}
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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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(do_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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(do_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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if (cipher_authlen(cipher) &&
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!EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_SET_IV_FIXED,
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-1, (u_char *)iv))
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fatal("cipher_init: EVP_CTRL_GCM_SET_IV_FIXED 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 != (u_int)klen) {
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debug2("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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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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free(junk);
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free(discard);
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}
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}
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/*
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* cipher_crypt() operates as following:
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* Copy 'aadlen' bytes (without en/decryption) from 'src' to 'dest'.
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* Theses bytes are treated as additional authenticated data for
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* authenticated encryption modes.
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* En/Decrypt 'len' bytes at offset 'aadlen' from 'src' to 'dest'.
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* Use 'authlen' bytes at offset 'len'+'aadlen' as the authentication tag.
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* This tag is written on encryption and verified on decryption.
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* Both 'aadlen' and 'authlen' can be set to 0.
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* cipher_crypt() returns 0 on success and -1 if the decryption integrity
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* check fails.
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*/
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int
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cipher_crypt(CipherContext *cc, u_int seqnr, u_char *dest, const u_char *src,
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u_int len, u_int aadlen, u_int authlen)
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{
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if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
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return chachapoly_crypt(&cc->cp_ctx, seqnr, dest, src, len,
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aadlen, authlen, cc->encrypt);
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if (authlen) {
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u_char lastiv[1];
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if (authlen != cipher_authlen(cc->cipher))
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fatal("%s: authlen mismatch %d", __func__, authlen);
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/* increment IV */
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if (!EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_IV_GEN,
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1, lastiv))
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fatal("%s: EVP_CTRL_GCM_IV_GEN", __func__);
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/* set tag on decyption */
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if (!cc->encrypt &&
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!EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_SET_TAG,
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authlen, (u_char *)src + aadlen + len))
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fatal("%s: EVP_CTRL_GCM_SET_TAG", __func__);
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}
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if (aadlen) {
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if (authlen &&
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EVP_Cipher(&cc->evp, NULL, (u_char *)src, aadlen) < 0)
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fatal("%s: EVP_Cipher(aad) failed", __func__);
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memcpy(dest, src, aadlen);
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}
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if (len % cc->cipher->block_size)
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fatal("%s: bad plaintext length %d", __func__, len);
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if (EVP_Cipher(&cc->evp, dest + aadlen, (u_char *)src + aadlen,
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len) < 0)
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fatal("%s: EVP_Cipher failed", __func__);
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if (authlen) {
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/* compute tag (on encrypt) or verify tag (on decrypt) */
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if (EVP_Cipher(&cc->evp, NULL, NULL, 0) < 0) {
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if (cc->encrypt)
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fatal("%s: EVP_Cipher(final) failed", __func__);
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else
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return -1;
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}
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if (cc->encrypt &&
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!EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_GET_TAG,
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authlen, dest + aadlen + len))
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fatal("%s: EVP_CTRL_GCM_GET_TAG", __func__);
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}
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return 0;
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}
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/* Extract the packet length, including any decryption necessary beforehand */
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int
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cipher_get_length(CipherContext *cc, u_int *plenp, u_int seqnr,
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const u_char *cp, u_int len)
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{
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if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
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return chachapoly_get_length(&cc->cp_ctx, plenp, seqnr,
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cp, len);
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if (len < 4)
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return -1;
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*plenp = get_u32(cp);
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return 0;
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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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if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
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memset(&cc->cp_ctx, 0, sizeof(cc->cp_ctx));
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else if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0)
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error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed");
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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, const Cipher *cipher,
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const char *passphrase, int do_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, do_encrypt);
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|
|
|
memset(digest, 0, sizeof(digest));
|
|
memset(&md, 0, sizeof(md));
|
|
}
|
|
|
|
/*
|
|
* Exports an IV from the CipherContext required to export the key
|
|
* state back from the unprivileged child to the privileged parent
|
|
* process.
|
|
*/
|
|
|
|
int
|
|
cipher_get_keyiv_len(const CipherContext *cc)
|
|
{
|
|
const Cipher *c = cc->cipher;
|
|
int ivlen;
|
|
|
|
if (c->number == SSH_CIPHER_3DES)
|
|
ivlen = 24;
|
|
else if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
|
|
ivlen = 0;
|
|
else
|
|
ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp);
|
|
return (ivlen);
|
|
}
|
|
|
|
void
|
|
cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len)
|
|
{
|
|
const Cipher *c = cc->cipher;
|
|
int evplen;
|
|
|
|
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) {
|
|
if (len != 0)
|
|
fatal("%s: wrong iv length %d != %d", __func__, len, 0);
|
|
return;
|
|
}
|
|
|
|
switch (c->number) {
|
|
#ifdef NONE_CIPHER_ENABLED
|
|
case SSH_CIPHER_NONE:
|
|
#endif
|
|
case SSH_CIPHER_SSH2:
|
|
case SSH_CIPHER_DES:
|
|
case SSH_CIPHER_BLOWFISH:
|
|
evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
|
|
if (evplen <= 0)
|
|
return;
|
|
if ((u_int)evplen != len)
|
|
fatal("%s: wrong iv length %d != %d", __func__,
|
|
evplen, len);
|
|
#ifdef USE_BUILTIN_RIJNDAEL
|
|
if (c->evptype == evp_rijndael)
|
|
ssh_rijndael_iv(&cc->evp, 0, iv, len);
|
|
else
|
|
#endif
|
|
#ifndef OPENSSL_HAVE_EVPCTR
|
|
if (c->evptype == evp_aes_128_ctr)
|
|
ssh_aes_ctr_iv(&cc->evp, 0, iv, len);
|
|
else
|
|
#endif
|
|
memcpy(iv, cc->evp.iv, len);
|
|
break;
|
|
case SSH_CIPHER_3DES:
|
|
ssh1_3des_iv(&cc->evp, 0, iv, 24);
|
|
break;
|
|
default:
|
|
fatal("%s: bad cipher %d", __func__, c->number);
|
|
}
|
|
}
|
|
|
|
void
|
|
cipher_set_keyiv(CipherContext *cc, u_char *iv)
|
|
{
|
|
const Cipher *c = cc->cipher;
|
|
int evplen = 0;
|
|
|
|
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
|
|
return;
|
|
|
|
switch (c->number) {
|
|
#ifdef NONE_CIPHER_ENABLED
|
|
case SSH_CIPHER_NONE:
|
|
#endif
|
|
case SSH_CIPHER_SSH2:
|
|
case SSH_CIPHER_DES:
|
|
case SSH_CIPHER_BLOWFISH:
|
|
evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
|
|
if (evplen == 0)
|
|
return;
|
|
#ifdef USE_BUILTIN_RIJNDAEL
|
|
if (c->evptype == evp_rijndael)
|
|
ssh_rijndael_iv(&cc->evp, 1, iv, evplen);
|
|
else
|
|
#endif
|
|
#ifndef OPENSSL_HAVE_EVPCTR
|
|
if (c->evptype == evp_aes_128_ctr)
|
|
ssh_aes_ctr_iv(&cc->evp, 1, iv, evplen);
|
|
else
|
|
#endif
|
|
memcpy(cc->evp.iv, iv, evplen);
|
|
break;
|
|
case SSH_CIPHER_3DES:
|
|
ssh1_3des_iv(&cc->evp, 1, iv, 24);
|
|
break;
|
|
default:
|
|
fatal("%s: bad cipher %d", __func__, c->number);
|
|
}
|
|
}
|
|
|
|
int
|
|
cipher_get_keycontext(const CipherContext *cc, u_char *dat)
|
|
{
|
|
const Cipher *c = cc->cipher;
|
|
int plen = 0;
|
|
|
|
if (c->evptype == EVP_rc4) {
|
|
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)
|
|
{
|
|
const Cipher *c = cc->cipher;
|
|
int plen;
|
|
|
|
if (c->evptype == EVP_rc4) {
|
|
plen = EVP_X_STATE_LEN(cc->evp);
|
|
memcpy(EVP_X_STATE(cc->evp), dat, plen);
|
|
}
|
|
}
|