diff options
author | des <des@FreeBSD.org> | 2008-07-22 17:13:05 +0000 |
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committer | des <des@FreeBSD.org> | 2008-07-22 17:13:05 +0000 |
commit | 624d93001f28e236c027516d88282351eb7bffbe (patch) | |
tree | 4b825dc642cb6eb9a060e54bf8d69288fbee4904 /crypto/openssh/cipher.c | |
parent | f591b3e29c677bff2b0f0d482490554c419128fd (diff) | |
download | FreeBSD-src-624d93001f28e236c027516d88282351eb7bffbe.zip FreeBSD-src-624d93001f28e236c027516d88282351eb7bffbe.tar.gz |
Flatten the OpenSSH vendor tree for 3.x and newer.
Diffstat (limited to 'crypto/openssh/cipher.c')
-rw-r--r-- | crypto/openssh/cipher.c | 424 |
1 files changed, 0 insertions, 424 deletions
diff --git a/crypto/openssh/cipher.c b/crypto/openssh/cipher.c deleted file mode 100644 index b264063..0000000 --- a/crypto/openssh/cipher.c +++ /dev/null @@ -1,424 +0,0 @@ -/* $OpenBSD: cipher.c,v 1.81 2006/08/03 03:34:42 deraadt 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 <openssl/md5.h> - -#include <string.h> -#include <stdarg.h> - -#include "xmalloc.h" -#include "log.h" -#include "cipher.h" - -/* 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); -extern void ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int); -extern const EVP_CIPHER *evp_aes_128_ctr(void); -extern void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, int, u_char *, u_int); - -struct Cipher { - char *name; - int number; /* for ssh1 only */ - u_int block_size; - u_int key_len; - u_int discard_len; - const EVP_CIPHER *(*evptype)(void); -} ciphers[] = { - { "none", SSH_CIPHER_NONE, 8, 0, 0, EVP_enc_null }, - { "des", SSH_CIPHER_DES, 8, 8, 0, EVP_des_cbc }, - { "3des", SSH_CIPHER_3DES, 8, 16, 0, evp_ssh1_3des }, - { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, 0, evp_ssh1_bf }, - - { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, 0, EVP_des_ede3_cbc }, - { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, 0, EVP_bf_cbc }, - { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, 0, EVP_cast5_cbc }, - { "arcfour", SSH_CIPHER_SSH2, 8, 16, 0, EVP_rc4 }, - { "arcfour128", SSH_CIPHER_SSH2, 8, 16, 1536, EVP_rc4 }, - { "arcfour256", SSH_CIPHER_SSH2, 8, 32, 1536, EVP_rc4 }, - { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, 0, EVP_aes_128_cbc }, - { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, 0, EVP_aes_192_cbc }, - { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, 0, EVP_aes_256_cbc }, - { "rijndael-cbc@lysator.liu.se", - SSH_CIPHER_SSH2, 16, 32, 0, EVP_aes_256_cbc }, - { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, evp_aes_128_ctr }, - { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, evp_aes_128_ctr }, - { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, evp_aes_128_ctr }, -#ifdef USE_CIPHER_ACSS - { "acss@openssh.org", SSH_CIPHER_SSH2, 16, 5, 0, EVP_acss }, -#endif - { NULL, SSH_CIPHER_INVALID, 0, 0, 0, NULL } -}; - -/*--*/ - -u_int -cipher_blocksize(const Cipher *c) -{ - return (c->block_size); -} - -u_int -cipher_keylen(const Cipher *c) -{ - return (c->key_len); -} - -u_int -cipher_get_number(const Cipher *c) -{ - return (c->number); -} - -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; -} - -Cipher * -cipher_by_name(const char *name) -{ - Cipher *c; - for (c = ciphers; c->name != NULL; c++) - if (strcmp(c->name, name) == 0) - return c; - return NULL; -} - -Cipher * -cipher_by_number(int id) -{ - Cipher *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) -{ - Cipher *c; - char *cipher_list, *cp; - char *p; - - if (names == NULL || strcmp(names, "") == 0) - return 0; - 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(cipher_list); - return 0; - } else { - debug3("cipher ok: %s [%s]", p, names); - } - } - debug3("ciphers ok: [%s]", names); - xfree(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) -{ - Cipher *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) -{ - Cipher *c = cipher_by_number(id); - return (c==NULL) ? "<unknown>" : c->name; -} - -void -cipher_init(CipherContext *cc, Cipher *cipher, - const u_char *key, u_int keylen, const u_char *iv, u_int ivlen, - int do_encrypt) -{ - static int dowarn = 1; -#ifdef SSH_OLD_EVP - EVP_CIPHER *type; -#else - const EVP_CIPHER *type; - int klen; -#endif - u_char *junk, *discard; - - if (cipher->number == SSH_CIPHER_DES) { - if (dowarn) { - error("Warning: use of DES is strongly discouraged " - "due to cryptographic weaknesses"); - dowarn = 0; - } - if (keylen > 8) - keylen = 8; - } - cc->plaintext = (cipher->number == SSH_CIPHER_NONE); - - if (keylen < cipher->key_len) - fatal("cipher_init: key length %d is insufficient for %s.", - keylen, cipher->name); - if (iv != NULL && ivlen < cipher->block_size) - fatal("cipher_init: iv length %d is insufficient for %s.", - ivlen, cipher->name); - cc->cipher = cipher; - - type = (*cipher->evptype)(); - - EVP_CIPHER_CTX_init(&cc->evp); -#ifdef SSH_OLD_EVP - if (type->key_len > 0 && type->key_len != keylen) { - debug("cipher_init: set keylen (%d -> %d)", - type->key_len, keylen); - type->key_len = keylen; - } - EVP_CipherInit(&cc->evp, type, (u_char *)key, (u_char *)iv, - (do_encrypt == CIPHER_ENCRYPT)); -#else - if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv, - (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 != (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)", - klen, keylen); - } - if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0) - 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 -cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) -{ - if (len % cc->cipher->block_size) - fatal("cipher_encrypt: bad plaintext length %d", len); - if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0) - fatal("evp_crypt: EVP_Cipher failed"); -} - -void -cipher_cleanup(CipherContext *cc) -{ - if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0) - error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed"); -} - -/* - * Selects the cipher, and keys if by computing the MD5 checksum of the - * passphrase and using the resulting 16 bytes as the key. - */ - -void -cipher_set_key_string(CipherContext *cc, Cipher *cipher, - const char *passphrase, int do_encrypt) -{ - MD5_CTX md; - u_char digest[16]; - - MD5_Init(&md); - MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase)); - MD5_Final(digest, &md); - - cipher_init(cc, cipher, digest, 16, NULL, 0, do_encrypt); - - 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) -{ - Cipher *c = cc->cipher; - int ivlen; - - if (c->number == SSH_CIPHER_3DES) - ivlen = 24; - else - ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp); - return (ivlen); -} - -void -cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len) -{ - Cipher *c = cc->cipher; - int evplen; - - switch (c->number) { - 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 - if (c->evptype == evp_aes_128_ctr) - ssh_aes_ctr_iv(&cc->evp, 0, iv, len); - else - 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) -{ - Cipher *c = cc->cipher; - int evplen = 0; - - switch (c->number) { - 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 - if (c->evptype == evp_aes_128_ctr) - ssh_aes_ctr_iv(&cc->evp, 1, iv, evplen); - else - 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); - } -} - -#if OPENSSL_VERSION_NUMBER < 0x00907000L -#define EVP_X_STATE(evp) &(evp).c -#define EVP_X_STATE_LEN(evp) sizeof((evp).c) -#else -#define EVP_X_STATE(evp) (evp).cipher_data -#define EVP_X_STATE_LEN(evp) (evp).cipher->ctx_size -#endif - -int -cipher_get_keycontext(const CipherContext *cc, u_char *dat) -{ - Cipher *c = cc->cipher; - int plen = 0; - - if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) { - 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) -{ - Cipher *c = cc->cipher; - int plen; - - if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) { - plen = EVP_X_STATE_LEN(cc->evp); - memcpy(EVP_X_STATE(cc->evp), dat, plen); - } -} |