Adding upstream version 1:10.0p1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
This commit is contained in:
parent
4b41451d73
commit
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GPG key ID:
BCC918A2ABD66424
884 changed files with 270723 additions and 0 deletions
505
cipher.c
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505
cipher.c
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/* $OpenBSD: cipher.c,v 1.124 2025/03/14 09:49:49 tb Exp $ */
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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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#include <sys/types.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 "cipher.h"
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#include "misc.h"
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#include "sshbuf.h"
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#include "ssherr.h"
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#include "digest.h"
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#include "openbsd-compat/openssl-compat.h"
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#ifndef WITH_OPENSSL
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#define EVP_CIPHER_CTX void
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#endif
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struct sshcipher_ctx {
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int plaintext;
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int encrypt;
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EVP_CIPHER_CTX *evp;
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struct chachapoly_ctx *cp_ctx;
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struct aesctr_ctx ac_ctx; /* XXX union with evp? */
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const struct sshcipher *cipher;
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};
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struct sshcipher {
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char *name;
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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 flags;
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#define CFLAG_CBC (1<<0)
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#define CFLAG_CHACHAPOLY (1<<1)
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#define CFLAG_AESCTR (1<<2)
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#define CFLAG_NONE (1<<3)
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#define CFLAG_INTERNAL CFLAG_NONE /* Don't use "none" for packets */
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#ifdef WITH_OPENSSL
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const EVP_CIPHER *(*evptype)(void);
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#else
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void *ignored;
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#endif
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};
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static const struct sshcipher ciphers[] = {
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#ifdef WITH_OPENSSL
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#ifndef OPENSSL_NO_DES
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{ "3des-cbc", 8, 24, 0, 0, CFLAG_CBC, EVP_des_ede3_cbc },
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#endif
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{ "aes128-cbc", 16, 16, 0, 0, CFLAG_CBC, EVP_aes_128_cbc },
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{ "aes192-cbc", 16, 24, 0, 0, CFLAG_CBC, EVP_aes_192_cbc },
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{ "aes256-cbc", 16, 32, 0, 0, CFLAG_CBC, EVP_aes_256_cbc },
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{ "aes128-ctr", 16, 16, 0, 0, 0, EVP_aes_128_ctr },
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{ "aes192-ctr", 16, 24, 0, 0, 0, EVP_aes_192_ctr },
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{ "aes256-ctr", 16, 32, 0, 0, 0, EVP_aes_256_ctr },
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{ "aes128-gcm@openssh.com",
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16, 16, 12, 16, 0, EVP_aes_128_gcm },
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{ "aes256-gcm@openssh.com",
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16, 32, 12, 16, 0, EVP_aes_256_gcm },
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#else
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{ "aes128-ctr", 16, 16, 0, 0, CFLAG_AESCTR, NULL },
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{ "aes192-ctr", 16, 24, 0, 0, CFLAG_AESCTR, NULL },
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{ "aes256-ctr", 16, 32, 0, 0, CFLAG_AESCTR, NULL },
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#endif
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{ "chacha20-poly1305@openssh.com",
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8, 64, 0, 16, CFLAG_CHACHAPOLY, NULL },
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{ "none", 8, 0, 0, 0, CFLAG_NONE, NULL },
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{ NULL, 0, 0, 0, 0, 0, NULL }
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};
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/*--*/
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/* Returns a comma-separated list of supported ciphers. */
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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 *tmp, *ret = NULL;
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size_t nlen, rlen = 0;
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const struct sshcipher *c;
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for (c = ciphers; c->name != NULL; c++) {
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if ((c->flags & CFLAG_INTERNAL) != 0)
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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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if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
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free(ret);
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return NULL;
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}
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ret = tmp;
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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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const char *
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compression_alg_list(int compression)
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{
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#ifdef WITH_ZLIB
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return compression ? "zlib@openssh.com,none" :
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"none,zlib@openssh.com";
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#else
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return "none";
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#endif
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}
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u_int
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cipher_blocksize(const struct sshcipher *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 struct sshcipher *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 struct sshcipher *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 struct sshcipher *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 struct sshcipher *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_is_cbc(const struct sshcipher *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_ctx_is_plaintext(struct sshcipher_ctx *cc)
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{
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return cc->plaintext;
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}
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const struct sshcipher *
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cipher_by_name(const char *name)
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{
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const struct sshcipher *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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#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 struct sshcipher *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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if ((cipher_list = cp = strdup(names)) == NULL)
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return 0;
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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->flags & CFLAG_INTERNAL) != 0) {
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free(cipher_list);
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return 0;
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}
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}
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free(cipher_list);
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return 1;
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}
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const char *
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cipher_warning_message(const struct sshcipher_ctx *cc)
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{
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if (cc == NULL || cc->cipher == NULL)
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return NULL;
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/* XXX repurpose for CBC warning */
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return NULL;
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}
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int
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cipher_init(struct sshcipher_ctx **ccp, const struct sshcipher *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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struct sshcipher_ctx *cc = NULL;
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int ret = SSH_ERR_INTERNAL_ERROR;
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#ifdef WITH_OPENSSL
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const EVP_CIPHER *type;
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int klen;
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#endif
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*ccp = NULL;
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if ((cc = calloc(1, sizeof(*cc))) == NULL)
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return SSH_ERR_ALLOC_FAIL;
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cc->plaintext = (cipher->flags & CFLAG_NONE) != 0;
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cc->encrypt = do_encrypt;
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if (keylen < cipher->key_len ||
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(iv != NULL && ivlen < cipher_ivlen(cipher))) {
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ret = SSH_ERR_INVALID_ARGUMENT;
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goto out;
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}
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cc->cipher = cipher;
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if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) {
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cc->cp_ctx = chachapoly_new(key, keylen);
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ret = cc->cp_ctx != NULL ? 0 : SSH_ERR_INVALID_ARGUMENT;
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goto out;
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}
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if ((cc->cipher->flags & CFLAG_NONE) != 0) {
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ret = 0;
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goto out;
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}
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#ifndef WITH_OPENSSL
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if ((cc->cipher->flags & CFLAG_AESCTR) != 0) {
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aesctr_keysetup(&cc->ac_ctx, key, 8 * keylen, 8 * ivlen);
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aesctr_ivsetup(&cc->ac_ctx, iv);
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ret = 0;
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goto out;
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}
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ret = SSH_ERR_INVALID_ARGUMENT;
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goto out;
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#else /* WITH_OPENSSL */
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type = (*cipher->evptype)();
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if ((cc->evp = EVP_CIPHER_CTX_new()) == NULL) {
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ret = SSH_ERR_ALLOC_FAIL;
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goto out;
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}
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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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ret = SSH_ERR_LIBCRYPTO_ERROR;
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goto out;
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}
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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) <= 0) {
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ret = SSH_ERR_LIBCRYPTO_ERROR;
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goto out;
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}
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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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if (EVP_CIPHER_CTX_set_key_length(cc->evp, keylen) == 0) {
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ret = SSH_ERR_LIBCRYPTO_ERROR;
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goto out;
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}
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}
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if (EVP_CipherInit(cc->evp, NULL, (u_char *)key, NULL, -1) == 0) {
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ret = SSH_ERR_LIBCRYPTO_ERROR;
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goto out;
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}
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ret = 0;
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#endif /* WITH_OPENSSL */
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out:
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if (ret == 0) {
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/* success */
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*ccp = cc;
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} else {
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if (cc != NULL) {
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#ifdef WITH_OPENSSL
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EVP_CIPHER_CTX_free(cc->evp);
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#endif /* WITH_OPENSSL */
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freezero(cc, sizeof(*cc));
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}
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}
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return ret;
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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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* These 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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*/
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int
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cipher_crypt(struct sshcipher_ctx *cc, u_int seqnr, u_char *dest,
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const u_char *src, 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,
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len, aadlen, authlen, cc->encrypt);
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}
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if ((cc->cipher->flags & CFLAG_NONE) != 0) {
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memcpy(dest, src, aadlen + len);
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return 0;
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}
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#ifndef WITH_OPENSSL
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if ((cc->cipher->flags & CFLAG_AESCTR) != 0) {
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if (aadlen)
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memcpy(dest, src, aadlen);
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aesctr_encrypt_bytes(&cc->ac_ctx, src + aadlen,
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dest + aadlen, len);
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return 0;
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}
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return SSH_ERR_INVALID_ARGUMENT;
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#else
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if (authlen) {
|
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u_char lastiv[1];
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|
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if (authlen != cipher_authlen(cc->cipher))
|
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return SSH_ERR_INVALID_ARGUMENT;
|
||||
/* increment IV */
|
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if (EVP_CIPHER_CTX_ctrl(cc->evp, EVP_CTRL_GCM_IV_GEN,
|
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1, lastiv) <= 0)
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return SSH_ERR_LIBCRYPTO_ERROR;
|
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/* set tag on decryption */
|
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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) <= 0)
|
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return SSH_ERR_LIBCRYPTO_ERROR;
|
||||
}
|
||||
if (aadlen) {
|
||||
if (authlen &&
|
||||
EVP_Cipher(cc->evp, NULL, (u_char *)src, aadlen) < 0)
|
||||
return SSH_ERR_LIBCRYPTO_ERROR;
|
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memcpy(dest, src, aadlen);
|
||||
}
|
||||
if (len % cc->cipher->block_size)
|
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return SSH_ERR_INVALID_ARGUMENT;
|
||||
if (EVP_Cipher(cc->evp, dest + aadlen, (u_char *)src + aadlen,
|
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len) < 0)
|
||||
return SSH_ERR_LIBCRYPTO_ERROR;
|
||||
if (authlen) {
|
||||
/* compute tag (on encrypt) or verify tag (on decrypt) */
|
||||
if (EVP_Cipher(cc->evp, NULL, NULL, 0) < 0)
|
||||
return cc->encrypt ?
|
||||
SSH_ERR_LIBCRYPTO_ERROR : SSH_ERR_MAC_INVALID;
|
||||
if (cc->encrypt &&
|
||||
EVP_CIPHER_CTX_ctrl(cc->evp, EVP_CTRL_GCM_GET_TAG,
|
||||
authlen, dest + aadlen + len) <= 0)
|
||||
return SSH_ERR_LIBCRYPTO_ERROR;
|
||||
}
|
||||
return 0;
|
||||
#endif
|
||||
}
|
||||
|
||||
/* Extract the packet length, including any decryption necessary beforehand */
|
||||
int
|
||||
cipher_get_length(struct sshcipher_ctx *cc, u_int *plenp, u_int seqnr,
|
||||
const u_char *cp, u_int len)
|
||||
{
|
||||
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
|
||||
return chachapoly_get_length(cc->cp_ctx, plenp, seqnr,
|
||||
cp, len);
|
||||
if (len < 4)
|
||||
return SSH_ERR_MESSAGE_INCOMPLETE;
|
||||
*plenp = PEEK_U32(cp);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void
|
||||
cipher_free(struct sshcipher_ctx *cc)
|
||||
{
|
||||
if (cc == NULL)
|
||||
return;
|
||||
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) {
|
||||
chachapoly_free(cc->cp_ctx);
|
||||
cc->cp_ctx = NULL;
|
||||
} else if ((cc->cipher->flags & CFLAG_AESCTR) != 0)
|
||||
explicit_bzero(&cc->ac_ctx, sizeof(cc->ac_ctx));
|
||||
#ifdef WITH_OPENSSL
|
||||
EVP_CIPHER_CTX_free(cc->evp);
|
||||
cc->evp = NULL;
|
||||
#endif
|
||||
freezero(cc, sizeof(*cc));
|
||||
}
|
||||
|
||||
int
|
||||
cipher_get_keyiv(struct sshcipher_ctx *cc, u_char *iv, size_t len)
|
||||
{
|
||||
#ifdef WITH_OPENSSL
|
||||
const struct sshcipher *c = cc->cipher;
|
||||
int evplen;
|
||||
#endif
|
||||
|
||||
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) {
|
||||
if (len != 0)
|
||||
return SSH_ERR_INVALID_ARGUMENT;
|
||||
return 0;
|
||||
}
|
||||
if ((cc->cipher->flags & CFLAG_AESCTR) != 0) {
|
||||
if (len != sizeof(cc->ac_ctx.ctr))
|
||||
return SSH_ERR_INVALID_ARGUMENT;
|
||||
memcpy(iv, cc->ac_ctx.ctr, len);
|
||||
return 0;
|
||||
}
|
||||
if ((cc->cipher->flags & CFLAG_NONE) != 0)
|
||||
return 0;
|
||||
|
||||
#ifdef WITH_OPENSSL
|
||||
evplen = EVP_CIPHER_CTX_iv_length(cc->evp);
|
||||
if (evplen == 0)
|
||||
return 0;
|
||||
else if (evplen < 0)
|
||||
return SSH_ERR_LIBCRYPTO_ERROR;
|
||||
if ((size_t)evplen != len)
|
||||
return SSH_ERR_INVALID_ARGUMENT;
|
||||
if (cipher_authlen(c)) {
|
||||
if (EVP_CIPHER_CTX_ctrl(cc->evp, EVP_CTRL_GCM_IV_GEN, len,
|
||||
iv) <= 0)
|
||||
return SSH_ERR_LIBCRYPTO_ERROR;
|
||||
} else if (EVP_CIPHER_CTX_get_iv(cc->evp, iv, len) <= 0)
|
||||
return SSH_ERR_LIBCRYPTO_ERROR;
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
cipher_set_keyiv(struct sshcipher_ctx *cc, const u_char *iv, size_t len)
|
||||
{
|
||||
#ifdef WITH_OPENSSL
|
||||
const struct sshcipher *c = cc->cipher;
|
||||
int evplen = 0;
|
||||
#endif
|
||||
|
||||
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
|
||||
return 0;
|
||||
if ((cc->cipher->flags & CFLAG_NONE) != 0)
|
||||
return 0;
|
||||
|
||||
#ifdef WITH_OPENSSL
|
||||
evplen = EVP_CIPHER_CTX_iv_length(cc->evp);
|
||||
if (evplen <= 0)
|
||||
return SSH_ERR_LIBCRYPTO_ERROR;
|
||||
if ((size_t)evplen != len)
|
||||
return SSH_ERR_INVALID_ARGUMENT;
|
||||
if (cipher_authlen(c)) {
|
||||
/* XXX iv arg is const, but EVP_CIPHER_CTX_ctrl isn't */
|
||||
if (EVP_CIPHER_CTX_ctrl(cc->evp,
|
||||
EVP_CTRL_GCM_SET_IV_FIXED, -1, (void *)iv) <= 0)
|
||||
return SSH_ERR_LIBCRYPTO_ERROR;
|
||||
} else if (!EVP_CIPHER_CTX_set_iv(cc->evp, iv, evplen))
|
||||
return SSH_ERR_LIBCRYPTO_ERROR;
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue