+/* $OpenBSD: cipher.c,v 1.82 2009/01/26 09:58:15 markus Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
*/
#include "includes.h"
-RCSID("$OpenBSD: cipher.c,v 1.68 2004/01/23 19:26:33 hshoexer Exp $");
-#include "xmalloc.h"
-#include "log.h"
-#include "cipher.h"
+#include <sys/types.h>
#include <openssl/md5.h>
-#if OPENSSL_VERSION_NUMBER < 0x00906000L
-#define SSH_OLD_EVP
-#define EVP_CIPHER_CTX_get_app_data(e) ((e)->app_data)
-#endif
+#include <string.h>
+#include <stdarg.h>
-#if OPENSSL_VERSION_NUMBER < 0x00907000L
-extern const EVP_CIPHER *evp_rijndael(void);
-extern void ssh_rijndael_iv(EVP_CIPHER_CTX *, int, u_char *, u_int);
-#endif
+#include "xmalloc.h"
+#include "log.h"
+#include "cipher.h"
-#if !defined(EVP_CTRL_SET_ACSS_MODE)
-# if (OPENSSL_VERSION_NUMBER >= 0x00906000L)
-extern const EVP_CIPHER *evp_acss(void);
-# define EVP_acss evp_acss
-# define EVP_CTRL_SET_ACSS_MODE xxx /* used below */
-# else
-# define EVP_acss NULL /* Don't try to support ACSS on older OpenSSL */
-# endif /* (OPENSSL_VERSION_NUMBER >= 0x00906000L) */
-#endif /* !defined(EVP_CTRL_SET_ACSS_MODE) */
+/* compatibility with old or broken OpenSSL versions */
+#include "openbsd-compat/openssl-compat.h"
extern const EVP_CIPHER *evp_ssh1_bf(void);
extern const EVP_CIPHER *evp_ssh1_3des(void);
int number; /* for ssh1 only */
u_int block_size;
u_int key_len;
+ u_int discard_len;
+ u_int cbc_mode;
const EVP_CIPHER *(*evptype)(void);
} ciphers[] = {
- { "none", SSH_CIPHER_NONE, 8, 0, EVP_enc_null },
- { "des", SSH_CIPHER_DES, 8, 8, EVP_des_cbc },
- { "3des", SSH_CIPHER_3DES, 8, 16, evp_ssh1_3des },
- { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, evp_ssh1_bf },
-
- { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, EVP_des_ede3_cbc },
- { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_bf_cbc },
- { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_cast5_cbc },
- { "arcfour", SSH_CIPHER_SSH2, 8, 16, EVP_rc4 },
-#if OPENSSL_VERSION_NUMBER < 0x00907000L
- { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, evp_rijndael },
- { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, evp_rijndael },
- { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, evp_rijndael },
- { "rijndael-cbc@lysator.liu.se",
- SSH_CIPHER_SSH2, 16, 32, evp_rijndael },
-#else
- { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, EVP_aes_128_cbc },
- { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, EVP_aes_192_cbc },
- { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc },
+ { "none", SSH_CIPHER_NONE, 8, 0, 0, 0, EVP_enc_null },
+ { "des", SSH_CIPHER_DES, 8, 8, 0, 1, EVP_des_cbc },
+ { "3des", SSH_CIPHER_3DES, 8, 16, 0, 1, evp_ssh1_3des },
+ { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, 0, 1, evp_ssh1_bf },
+
+ { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, 0, 1, EVP_des_ede3_cbc },
+ { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, 0, 1, EVP_bf_cbc },
+ { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, 0, 1, EVP_cast5_cbc },
+ { "arcfour", SSH_CIPHER_SSH2, 8, 16, 0, 0, EVP_rc4 },
+ { "arcfour128", SSH_CIPHER_SSH2, 8, 16, 1536, 0, EVP_rc4 },
+ { "arcfour256", SSH_CIPHER_SSH2, 8, 32, 1536, 0, EVP_rc4 },
+ { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, 0, 1, EVP_aes_128_cbc },
+ { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, 0, 1, EVP_aes_192_cbc },
+ { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, 0, 1, EVP_aes_256_cbc },
{ "rijndael-cbc@lysator.liu.se",
- SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc },
-#endif
-#if OPENSSL_VERSION_NUMBER >= 0x00906000L
- { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, evp_aes_128_ctr },
- { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, evp_aes_128_ctr },
- { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, evp_aes_128_ctr },
+ SSH_CIPHER_SSH2, 16, 32, 0, 1, EVP_aes_256_cbc },
+ { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, 0, evp_aes_128_ctr },
+ { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, 0, evp_aes_128_ctr },
+ { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, 0, evp_aes_128_ctr },
+#ifdef USE_CIPHER_ACSS
+ { "acss@openssh.org", SSH_CIPHER_SSH2, 16, 5, 0, 0, EVP_acss },
#endif
-#if defined(EVP_CTRL_SET_ACSS_MODE)
- { "acss@openssh.org", SSH_CIPHER_SSH2, 16, 5, EVP_acss },
-#endif
- { NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL }
+ { NULL, SSH_CIPHER_INVALID, 0, 0, 0, 0, NULL }
};
/*--*/
return (c->number);
}
+u_int
+cipher_is_cbc(const Cipher *c)
+{
+ return (c->cbc_mode);
+}
+
u_int
cipher_mask_ssh1(int client)
{
{
Cipher *c;
for (c = ciphers; c->name != NULL; c++)
- if (strcasecmp(c->name, name) == 0)
+ if (strcmp(c->name, name) == 0)
return c;
return NULL;
}
ciphers_valid(const char *names)
{
Cipher *c;
- char *ciphers, *cp;
+ char *cipher_list, *cp;
char *p;
if (names == NULL || strcmp(names, "") == 0)
return 0;
- ciphers = cp = xstrdup(names);
+ cipher_list = cp = xstrdup(names);
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) {
debug("bad cipher %s [%s]", p, names);
- xfree(ciphers);
+ xfree(cipher_list);
return 0;
} else {
debug3("cipher ok: %s [%s]", p, names);
}
}
debug3("ciphers ok: [%s]", names);
- xfree(ciphers);
+ xfree(cipher_list);
return 1;
}
Cipher *c;
if (name == NULL)
return -1;
- c = cipher_by_name(name);
- return (c==NULL) ? -1 : c->number;
+ for (c = ciphers; c->name != NULL; c++)
+ if (strcasecmp(c->name, name) == 0)
+ return c->number;
+ return -1;
}
char *
void
cipher_init(CipherContext *cc, Cipher *cipher,
const u_char *key, u_int keylen, const u_char *iv, u_int ivlen,
- int encrypt)
+ int do_encrypt)
{
static int dowarn = 1;
#ifdef SSH_OLD_EVP
EVP_CIPHER *type;
#else
const EVP_CIPHER *type;
-#endif
int klen;
+#endif
+ u_char *junk, *discard;
if (cipher->number == SSH_CIPHER_DES) {
if (dowarn) {
type->key_len = keylen;
}
EVP_CipherInit(&cc->evp, type, (u_char *)key, (u_char *)iv,
- (encrypt == CIPHER_ENCRYPT));
+ (do_encrypt == CIPHER_ENCRYPT));
#else
if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv,
- (encrypt == CIPHER_ENCRYPT)) == 0)
+ (do_encrypt == CIPHER_ENCRYPT)) == 0)
fatal("cipher_init: EVP_CipherInit failed for %s",
cipher->name);
klen = EVP_CIPHER_CTX_key_length(&cc->evp);
- if (klen > 0 && keylen != klen) {
+ if (klen > 0 && keylen != (u_int)klen) {
debug2("cipher_init: set keylen (%d -> %d)", klen, keylen);
if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0)
fatal("cipher_init: set keylen failed (%d -> %d)",
fatal("cipher_init: EVP_CipherInit: set key failed for %s",
cipher->name);
#endif
+
+ if (cipher->discard_len > 0) {
+ junk = xmalloc(cipher->discard_len);
+ discard = xmalloc(cipher->discard_len);
+ if (EVP_Cipher(&cc->evp, discard, junk,
+ cipher->discard_len) == 0)
+ fatal("evp_crypt: EVP_Cipher failed during discard");
+ memset(discard, 0, cipher->discard_len);
+ xfree(junk);
+ xfree(discard);
+ }
}
void
{
if (len % cc->cipher->block_size)
fatal("cipher_encrypt: bad plaintext length %d", len);
-#ifdef SSH_OLD_EVP
- EVP_Cipher(&cc->evp, dest, (u_char *)src, len);
-#else
if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0)
fatal("evp_crypt: EVP_Cipher failed");
-#endif
}
void
cipher_cleanup(CipherContext *cc)
{
-#ifdef SSH_OLD_EVP
- EVP_CIPHER_CTX_cleanup(&cc->evp);
-#else
if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0)
error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed");
-#endif
}
/*
void
cipher_set_key_string(CipherContext *cc, Cipher *cipher,
- const char *passphrase, int encrypt)
+ const char *passphrase, int do_encrypt)
{
MD5_CTX md;
u_char digest[16];
MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase));
MD5_Final(digest, &md);
- cipher_init(cc, cipher, digest, 16, NULL, 0, encrypt);
+ cipher_init(cc, cipher, digest, 16, NULL, 0, do_encrypt);
memset(digest, 0, sizeof(digest));
memset(&md, 0, sizeof(md));
case SSH_CIPHER_DES:
case SSH_CIPHER_BLOWFISH:
evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
- if (evplen == 0)
+ if (evplen <= 0)
return;
- if (evplen != len)
+ if ((u_int)evplen != len)
fatal("%s: wrong iv length %d != %d", __func__,
evplen, len);
-#if OPENSSL_VERSION_NUMBER < 0x00907000L
+#ifdef USE_BUILTIN_RIJNDAEL
if (c->evptype == evp_rijndael)
ssh_rijndael_iv(&cc->evp, 0, iv, len);
else
evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
if (evplen == 0)
return;
-#if OPENSSL_VERSION_NUMBER < 0x00907000L
+#ifdef USE_BUILTIN_RIJNDAEL
if (c->evptype == evp_rijndael)
ssh_rijndael_iv(&cc->evp, 1, iv, evplen);
else
andersk / openssh.git / blobdiff