upstream) and a number of security fixes which we had already backported. MFC after: 1 week
650 lines
17 KiB
C
650 lines
17 KiB
C
/* $OpenBSD: cipher.c,v 1.99 2014/06/24 01:13:21 djm Exp $ */
|
|
/*
|
|
* Author: Tatu Ylonen <ylo@cs.hut.fi>
|
|
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
|
|
* All rights reserved
|
|
*
|
|
* As far as I am concerned, the code I have written for this software
|
|
* can be used freely for any purpose. Any derived versions of this
|
|
* software must be clearly marked as such, and if the derived work is
|
|
* incompatible with the protocol description in the RFC file, it must be
|
|
* called by a name other than "ssh" or "Secure Shell".
|
|
*
|
|
*
|
|
* Copyright (c) 1999 Niels Provos. All rights reserved.
|
|
* Copyright (c) 1999, 2000 Markus Friedl. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <string.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
|
|
#include "cipher.h"
|
|
#include "misc.h"
|
|
#include "sshbuf.h"
|
|
#include "ssherr.h"
|
|
#include "digest.h"
|
|
|
|
#include "openbsd-compat/openssl-compat.h"
|
|
|
|
#ifdef WITH_SSH1
|
|
extern const EVP_CIPHER *evp_ssh1_bf(void);
|
|
extern const EVP_CIPHER *evp_ssh1_3des(void);
|
|
extern int ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int);
|
|
#endif
|
|
|
|
struct sshcipher {
|
|
char *name;
|
|
int number; /* for ssh1 only */
|
|
u_int block_size;
|
|
u_int key_len;
|
|
u_int iv_len; /* defaults to block_size */
|
|
u_int auth_len;
|
|
u_int discard_len;
|
|
u_int flags;
|
|
#define CFLAG_CBC (1<<0)
|
|
#define CFLAG_CHACHAPOLY (1<<1)
|
|
#define CFLAG_AESCTR (1<<2)
|
|
#define CFLAG_NONE (1<<3)
|
|
#ifdef WITH_OPENSSL
|
|
const EVP_CIPHER *(*evptype)(void);
|
|
#else
|
|
void *ignored;
|
|
#endif
|
|
};
|
|
|
|
static const struct sshcipher ciphers[] = {
|
|
#ifdef WITH_SSH1
|
|
{ "des", SSH_CIPHER_DES, 8, 8, 0, 0, 0, 1, EVP_des_cbc },
|
|
{ "3des", SSH_CIPHER_3DES, 8, 16, 0, 0, 0, 1, evp_ssh1_3des },
|
|
{ "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, 0, 0, 0, 1, evp_ssh1_bf },
|
|
#endif /* WITH_SSH1 */
|
|
#ifdef WITH_OPENSSL
|
|
{ "none", SSH_CIPHER_NONE, 8, 0, 0, 0, 0, 0, EVP_enc_null },
|
|
{ "3des-cbc", SSH_CIPHER_SSH2, 8, 24, 0, 0, 0, 1, EVP_des_ede3_cbc },
|
|
{ "blowfish-cbc",
|
|
SSH_CIPHER_SSH2, 8, 16, 0, 0, 0, 1, EVP_bf_cbc },
|
|
{ "cast128-cbc",
|
|
SSH_CIPHER_SSH2, 8, 16, 0, 0, 0, 1, EVP_cast5_cbc },
|
|
{ "arcfour", SSH_CIPHER_SSH2, 8, 16, 0, 0, 0, 0, EVP_rc4 },
|
|
{ "arcfour128", SSH_CIPHER_SSH2, 8, 16, 0, 0, 1536, 0, EVP_rc4 },
|
|
{ "arcfour256", SSH_CIPHER_SSH2, 8, 32, 0, 0, 1536, 0, EVP_rc4 },
|
|
{ "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, 0, 0, 0, 1, EVP_aes_128_cbc },
|
|
{ "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, 0, 0, 0, 1, EVP_aes_192_cbc },
|
|
{ "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, 0, 0, 0, 1, EVP_aes_256_cbc },
|
|
{ "rijndael-cbc@lysator.liu.se",
|
|
SSH_CIPHER_SSH2, 16, 32, 0, 0, 0, 1, EVP_aes_256_cbc },
|
|
{ "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, 0, 0, 0, EVP_aes_128_ctr },
|
|
{ "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, 0, 0, 0, EVP_aes_192_ctr },
|
|
{ "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, 0, 0, 0, EVP_aes_256_ctr },
|
|
# ifdef OPENSSL_HAVE_EVPGCM
|
|
{ "aes128-gcm@openssh.com",
|
|
SSH_CIPHER_SSH2, 16, 16, 12, 16, 0, 0, EVP_aes_128_gcm },
|
|
{ "aes256-gcm@openssh.com",
|
|
SSH_CIPHER_SSH2, 16, 32, 12, 16, 0, 0, EVP_aes_256_gcm },
|
|
# endif /* OPENSSL_HAVE_EVPGCM */
|
|
#else /* WITH_OPENSSL */
|
|
{ "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, 0, 0, CFLAG_AESCTR, NULL },
|
|
{ "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, 0, 0, CFLAG_AESCTR, NULL },
|
|
{ "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, 0, 0, CFLAG_AESCTR, NULL },
|
|
{ "none", SSH_CIPHER_NONE, 8, 0, 0, 0, 0, CFLAG_NONE, NULL },
|
|
#endif /* WITH_OPENSSL */
|
|
{ "chacha20-poly1305@openssh.com",
|
|
SSH_CIPHER_SSH2, 8, 64, 0, 16, 0, CFLAG_CHACHAPOLY, NULL },
|
|
|
|
{ NULL, SSH_CIPHER_INVALID, 0, 0, 0, 0, 0, 0, NULL }
|
|
};
|
|
|
|
/*--*/
|
|
|
|
/* Returns a comma-separated list of supported ciphers. */
|
|
char *
|
|
cipher_alg_list(char sep, int auth_only)
|
|
{
|
|
char *tmp, *ret = NULL;
|
|
size_t nlen, rlen = 0;
|
|
const struct sshcipher *c;
|
|
|
|
for (c = ciphers; c->name != NULL; c++) {
|
|
if (c->number != SSH_CIPHER_SSH2)
|
|
continue;
|
|
if (auth_only && c->auth_len == 0)
|
|
continue;
|
|
if (ret != NULL)
|
|
ret[rlen++] = sep;
|
|
nlen = strlen(c->name);
|
|
if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
|
|
free(ret);
|
|
return NULL;
|
|
}
|
|
ret = tmp;
|
|
memcpy(ret + rlen, c->name, nlen + 1);
|
|
rlen += nlen;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
u_int
|
|
cipher_blocksize(const struct sshcipher *c)
|
|
{
|
|
return (c->block_size);
|
|
}
|
|
|
|
u_int
|
|
cipher_keylen(const struct sshcipher *c)
|
|
{
|
|
return (c->key_len);
|
|
}
|
|
|
|
u_int
|
|
cipher_seclen(const struct sshcipher *c)
|
|
{
|
|
if (strcmp("3des-cbc", c->name) == 0)
|
|
return 14;
|
|
return cipher_keylen(c);
|
|
}
|
|
|
|
u_int
|
|
cipher_authlen(const struct sshcipher *c)
|
|
{
|
|
return (c->auth_len);
|
|
}
|
|
|
|
u_int
|
|
cipher_ivlen(const struct sshcipher *c)
|
|
{
|
|
/*
|
|
* Default is cipher block size, except for chacha20+poly1305 that
|
|
* needs no IV. XXX make iv_len == -1 default?
|
|
*/
|
|
return (c->iv_len != 0 || (c->flags & CFLAG_CHACHAPOLY) != 0) ?
|
|
c->iv_len : c->block_size;
|
|
}
|
|
|
|
u_int
|
|
cipher_get_number(const struct sshcipher *c)
|
|
{
|
|
return (c->number);
|
|
}
|
|
|
|
u_int
|
|
cipher_is_cbc(const struct sshcipher *c)
|
|
{
|
|
return (c->flags & CFLAG_CBC) != 0;
|
|
}
|
|
|
|
u_int
|
|
cipher_mask_ssh1(int client)
|
|
{
|
|
u_int mask = 0;
|
|
mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */
|
|
mask |= 1 << SSH_CIPHER_BLOWFISH;
|
|
if (client) {
|
|
mask |= 1 << SSH_CIPHER_DES;
|
|
}
|
|
return mask;
|
|
}
|
|
|
|
const struct sshcipher *
|
|
cipher_by_name(const char *name)
|
|
{
|
|
const struct sshcipher *c;
|
|
for (c = ciphers; c->name != NULL; c++)
|
|
if (strcmp(c->name, name) == 0)
|
|
return c;
|
|
return NULL;
|
|
}
|
|
|
|
const struct sshcipher *
|
|
cipher_by_number(int id)
|
|
{
|
|
const struct sshcipher *c;
|
|
for (c = ciphers; c->name != NULL; c++)
|
|
if (c->number == id)
|
|
return c;
|
|
return NULL;
|
|
}
|
|
|
|
#define CIPHER_SEP ","
|
|
int
|
|
ciphers_valid(const char *names)
|
|
{
|
|
const struct sshcipher *c;
|
|
char *cipher_list, *cp;
|
|
char *p;
|
|
|
|
if (names == NULL || strcmp(names, "") == 0)
|
|
return 0;
|
|
if ((cipher_list = cp = strdup(names)) == NULL)
|
|
return 0;
|
|
for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0';
|
|
(p = strsep(&cp, CIPHER_SEP))) {
|
|
c = cipher_by_name(p);
|
|
if (c == NULL || c->number != SSH_CIPHER_SSH2) {
|
|
free(cipher_list);
|
|
return 0;
|
|
}
|
|
}
|
|
free(cipher_list);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Parses the name of the cipher. Returns the number of the corresponding
|
|
* cipher, or -1 on error.
|
|
*/
|
|
|
|
int
|
|
cipher_number(const char *name)
|
|
{
|
|
const struct sshcipher *c;
|
|
if (name == NULL)
|
|
return -1;
|
|
for (c = ciphers; c->name != NULL; c++)
|
|
if (strcasecmp(c->name, name) == 0)
|
|
return c->number;
|
|
return -1;
|
|
}
|
|
|
|
char *
|
|
cipher_name(int id)
|
|
{
|
|
const struct sshcipher *c = cipher_by_number(id);
|
|
return (c==NULL) ? "<unknown>" : c->name;
|
|
}
|
|
|
|
const char *
|
|
cipher_warning_message(const struct sshcipher_ctx *cc)
|
|
{
|
|
if (cc == NULL || cc->cipher == NULL)
|
|
return NULL;
|
|
if (cc->cipher->number == SSH_CIPHER_DES)
|
|
return "use of DES is strongly discouraged due to "
|
|
"cryptographic weaknesses";
|
|
return NULL;
|
|
}
|
|
|
|
int
|
|
cipher_init(struct sshcipher_ctx *cc, const struct sshcipher *cipher,
|
|
const u_char *key, u_int keylen, const u_char *iv, u_int ivlen,
|
|
int do_encrypt)
|
|
{
|
|
#ifdef WITH_OPENSSL
|
|
int ret = SSH_ERR_INTERNAL_ERROR;
|
|
const EVP_CIPHER *type;
|
|
int klen;
|
|
u_char *junk, *discard;
|
|
|
|
if (cipher->number == SSH_CIPHER_DES) {
|
|
if (keylen > 8)
|
|
keylen = 8;
|
|
}
|
|
#endif
|
|
cc->plaintext = (cipher->number == SSH_CIPHER_NONE);
|
|
cc->encrypt = do_encrypt;
|
|
|
|
if (keylen < cipher->key_len ||
|
|
(iv != NULL && ivlen < cipher_ivlen(cipher)))
|
|
return SSH_ERR_INVALID_ARGUMENT;
|
|
|
|
cc->cipher = cipher;
|
|
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) {
|
|
return chachapoly_init(&cc->cp_ctx, key, keylen);
|
|
}
|
|
#ifndef WITH_OPENSSL
|
|
if ((cc->cipher->flags & CFLAG_AESCTR) != 0) {
|
|
aesctr_keysetup(&cc->ac_ctx, key, 8 * keylen, 8 * ivlen);
|
|
aesctr_ivsetup(&cc->ac_ctx, iv);
|
|
return 0;
|
|
}
|
|
if ((cc->cipher->flags & CFLAG_NONE) != 0)
|
|
return 0;
|
|
return SSH_ERR_INVALID_ARGUMENT;
|
|
#else
|
|
type = (*cipher->evptype)();
|
|
EVP_CIPHER_CTX_init(&cc->evp);
|
|
if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv,
|
|
(do_encrypt == CIPHER_ENCRYPT)) == 0) {
|
|
ret = SSH_ERR_LIBCRYPTO_ERROR;
|
|
goto bad;
|
|
}
|
|
if (cipher_authlen(cipher) &&
|
|
!EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_SET_IV_FIXED,
|
|
-1, (u_char *)iv)) {
|
|
ret = SSH_ERR_LIBCRYPTO_ERROR;
|
|
goto bad;
|
|
}
|
|
klen = EVP_CIPHER_CTX_key_length(&cc->evp);
|
|
if (klen > 0 && keylen != (u_int)klen) {
|
|
if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0) {
|
|
ret = SSH_ERR_LIBCRYPTO_ERROR;
|
|
goto bad;
|
|
}
|
|
}
|
|
if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0) {
|
|
ret = SSH_ERR_LIBCRYPTO_ERROR;
|
|
goto bad;
|
|
}
|
|
|
|
if (cipher->discard_len > 0) {
|
|
if ((junk = malloc(cipher->discard_len)) == NULL ||
|
|
(discard = malloc(cipher->discard_len)) == NULL) {
|
|
if (junk != NULL)
|
|
free(junk);
|
|
ret = SSH_ERR_ALLOC_FAIL;
|
|
goto bad;
|
|
}
|
|
ret = EVP_Cipher(&cc->evp, discard, junk, cipher->discard_len);
|
|
explicit_bzero(discard, cipher->discard_len);
|
|
free(junk);
|
|
free(discard);
|
|
if (ret != 1) {
|
|
ret = SSH_ERR_LIBCRYPTO_ERROR;
|
|
bad:
|
|
EVP_CIPHER_CTX_cleanup(&cc->evp);
|
|
return ret;
|
|
}
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* cipher_crypt() operates as following:
|
|
* Copy 'aadlen' bytes (without en/decryption) from 'src' to 'dest'.
|
|
* Theses bytes are treated as additional authenticated data for
|
|
* authenticated encryption modes.
|
|
* En/Decrypt 'len' bytes at offset 'aadlen' from 'src' to 'dest'.
|
|
* Use 'authlen' bytes at offset 'len'+'aadlen' as the authentication tag.
|
|
* This tag is written on encryption and verified on decryption.
|
|
* Both 'aadlen' and 'authlen' can be set to 0.
|
|
*/
|
|
int
|
|
cipher_crypt(struct sshcipher_ctx *cc, u_int seqnr, u_char *dest,
|
|
const u_char *src, u_int len, u_int aadlen, u_int authlen)
|
|
{
|
|
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) {
|
|
return chachapoly_crypt(&cc->cp_ctx, seqnr, dest, src,
|
|
len, aadlen, authlen, cc->encrypt);
|
|
}
|
|
#ifndef WITH_OPENSSL
|
|
if ((cc->cipher->flags & CFLAG_AESCTR) != 0) {
|
|
if (aadlen)
|
|
memcpy(dest, src, aadlen);
|
|
aesctr_encrypt_bytes(&cc->ac_ctx, src + aadlen,
|
|
dest + aadlen, len);
|
|
return 0;
|
|
}
|
|
if ((cc->cipher->flags & CFLAG_NONE) != 0) {
|
|
memcpy(dest, src, aadlen + len);
|
|
return 0;
|
|
}
|
|
return SSH_ERR_INVALID_ARGUMENT;
|
|
#else
|
|
if (authlen) {
|
|
u_char lastiv[1];
|
|
|
|
if (authlen != cipher_authlen(cc->cipher))
|
|
return SSH_ERR_INVALID_ARGUMENT;
|
|
/* increment IV */
|
|
if (!EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_IV_GEN,
|
|
1, lastiv))
|
|
return SSH_ERR_LIBCRYPTO_ERROR;
|
|
/* set tag on decyption */
|
|
if (!cc->encrypt &&
|
|
!EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_SET_TAG,
|
|
authlen, (u_char *)src + aadlen + len))
|
|
return SSH_ERR_LIBCRYPTO_ERROR;
|
|
}
|
|
if (aadlen) {
|
|
if (authlen &&
|
|
EVP_Cipher(&cc->evp, NULL, (u_char *)src, aadlen) < 0)
|
|
return SSH_ERR_LIBCRYPTO_ERROR;
|
|
memcpy(dest, src, aadlen);
|
|
}
|
|
if (len % cc->cipher->block_size)
|
|
return SSH_ERR_INVALID_ARGUMENT;
|
|
if (EVP_Cipher(&cc->evp, dest + aadlen, (u_char *)src + aadlen,
|
|
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))
|
|
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 = get_u32(cp);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
cipher_cleanup(struct sshcipher_ctx *cc)
|
|
{
|
|
if (cc == NULL || cc->cipher == NULL)
|
|
return 0;
|
|
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
|
|
explicit_bzero(&cc->cp_ctx, sizeof(cc->cp_ctx));
|
|
else if ((cc->cipher->flags & CFLAG_AESCTR) != 0)
|
|
explicit_bzero(&cc->ac_ctx, sizeof(cc->ac_ctx));
|
|
#ifdef WITH_OPENSSL
|
|
else if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0)
|
|
return SSH_ERR_LIBCRYPTO_ERROR;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Selects the cipher, and keys if by computing the MD5 checksum of the
|
|
* passphrase and using the resulting 16 bytes as the key.
|
|
*/
|
|
int
|
|
cipher_set_key_string(struct sshcipher_ctx *cc, const struct sshcipher *cipher,
|
|
const char *passphrase, int do_encrypt)
|
|
{
|
|
u_char digest[16];
|
|
int r = SSH_ERR_INTERNAL_ERROR;
|
|
|
|
if ((r = ssh_digest_memory(SSH_DIGEST_MD5,
|
|
passphrase, strlen(passphrase),
|
|
digest, sizeof(digest))) != 0)
|
|
goto out;
|
|
|
|
r = cipher_init(cc, cipher, digest, 16, NULL, 0, do_encrypt);
|
|
out:
|
|
explicit_bzero(digest, sizeof(digest));
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Exports an IV from the sshcipher_ctx required to export the key
|
|
* state back from the unprivileged child to the privileged parent
|
|
* process.
|
|
*/
|
|
int
|
|
cipher_get_keyiv_len(const struct sshcipher_ctx *cc)
|
|
{
|
|
const struct sshcipher *c = cc->cipher;
|
|
int ivlen = 0;
|
|
|
|
if (c->number == SSH_CIPHER_3DES)
|
|
ivlen = 24;
|
|
else if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
|
|
ivlen = 0;
|
|
#ifdef WITH_OPENSSL
|
|
else
|
|
ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp);
|
|
#endif /* WITH_OPENSSL */
|
|
return (ivlen);
|
|
}
|
|
|
|
int
|
|
cipher_get_keyiv(struct sshcipher_ctx *cc, u_char *iv, u_int len)
|
|
{
|
|
const struct sshcipher *c = cc->cipher;
|
|
#ifdef WITH_OPENSSL
|
|
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_NONE) != 0)
|
|
return 0;
|
|
|
|
switch (c->number) {
|
|
#ifdef WITH_OPENSSL
|
|
case SSH_CIPHER_SSH2:
|
|
case SSH_CIPHER_DES:
|
|
case SSH_CIPHER_BLOWFISH:
|
|
evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
|
|
if (evplen == 0)
|
|
return 0;
|
|
else if (evplen < 0)
|
|
return SSH_ERR_LIBCRYPTO_ERROR;
|
|
if ((u_int)evplen != len)
|
|
return SSH_ERR_INVALID_ARGUMENT;
|
|
#ifndef OPENSSL_HAVE_EVPCTR
|
|
if (c->evptype == evp_aes_128_ctr)
|
|
ssh_aes_ctr_iv(&cc->evp, 0, iv, len);
|
|
else
|
|
#endif
|
|
if (cipher_authlen(c)) {
|
|
if (!EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_IV_GEN,
|
|
len, iv))
|
|
return SSH_ERR_LIBCRYPTO_ERROR;
|
|
} else
|
|
memcpy(iv, cc->evp.iv, len);
|
|
break;
|
|
#endif
|
|
#ifdef WITH_SSH1
|
|
case SSH_CIPHER_3DES:
|
|
return ssh1_3des_iv(&cc->evp, 0, iv, 24);
|
|
#endif
|
|
default:
|
|
return SSH_ERR_INVALID_ARGUMENT;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
cipher_set_keyiv(struct sshcipher_ctx *cc, const u_char *iv)
|
|
{
|
|
const struct sshcipher *c = cc->cipher;
|
|
#ifdef WITH_OPENSSL
|
|
int evplen = 0;
|
|
#endif
|
|
|
|
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
|
|
return 0;
|
|
if ((cc->cipher->flags & CFLAG_NONE) != 0)
|
|
return 0;
|
|
|
|
switch (c->number) {
|
|
#ifdef WITH_OPENSSL
|
|
case SSH_CIPHER_SSH2:
|
|
case SSH_CIPHER_DES:
|
|
case SSH_CIPHER_BLOWFISH:
|
|
evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
|
|
if (evplen <= 0)
|
|
return SSH_ERR_LIBCRYPTO_ERROR;
|
|
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))
|
|
return SSH_ERR_LIBCRYPTO_ERROR;
|
|
} else
|
|
memcpy(cc->evp.iv, iv, evplen);
|
|
break;
|
|
#endif
|
|
#ifdef WITH_SSH1
|
|
case SSH_CIPHER_3DES:
|
|
return ssh1_3des_iv(&cc->evp, 1, (u_char *)iv, 24);
|
|
#endif
|
|
default:
|
|
return SSH_ERR_INVALID_ARGUMENT;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef WITH_OPENSSL
|
|
#define EVP_X_STATE(evp) (evp).cipher_data
|
|
#define EVP_X_STATE_LEN(evp) (evp).cipher->ctx_size
|
|
#endif
|
|
|
|
int
|
|
cipher_get_keycontext(const struct sshcipher_ctx *cc, u_char *dat)
|
|
{
|
|
#ifdef WITH_OPENSSL
|
|
const struct sshcipher *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);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
cipher_set_keycontext(struct sshcipher_ctx *cc, const u_char *dat)
|
|
{
|
|
#ifdef WITH_OPENSSL
|
|
const struct sshcipher *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);
|
|
}
|
|
#endif
|
|
}
|