Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 5 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 6 | * As far as I am concerned, the code I have written for this software |
| 7 | * can be used freely for any purpose. Any derived versions of this |
| 8 | * software must be clearly marked as such, and if the derived work is |
| 9 | * incompatible with the protocol description in the RFC file, it must be |
| 10 | * called by a name other than "ssh" or "Secure Shell". |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 11 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 12 | * |
| 13 | * Copyright (c) 1999 Niels Provos. All rights reserved. |
Ben Lindstrom | 4469723 | 2001-07-04 03:32:30 +0000 | [diff] [blame] | 14 | * Copyright (c) 1999, 2000 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 15 | * |
| 16 | * Redistribution and use in source and binary forms, with or without |
| 17 | * modification, are permitted provided that the following conditions |
| 18 | * are met: |
| 19 | * 1. Redistributions of source code must retain the above copyright |
| 20 | * notice, this list of conditions and the following disclaimer. |
| 21 | * 2. Redistributions in binary form must reproduce the above copyright |
| 22 | * notice, this list of conditions and the following disclaimer in the |
| 23 | * documentation and/or other materials provided with the distribution. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 35 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 36 | |
| 37 | #include "includes.h" |
Damien Miller | 3a3261f | 2003-05-15 13:37:19 +1000 | [diff] [blame^] | 38 | RCSID("$OpenBSD: cipher.c,v 1.64 2003/05/15 03:08:29 markus Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 39 | |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 40 | #include "xmalloc.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 41 | #include "log.h" |
| 42 | #include "cipher.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 43 | |
| 44 | #include <openssl/md5.h> |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 45 | |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 46 | #if OPENSSL_VERSION_NUMBER < 0x00906000L |
| 47 | #define SSH_OLD_EVP |
| 48 | #define EVP_CIPHER_CTX_get_app_data(e) ((e)->app_data) |
| 49 | #endif |
| 50 | |
Ben Lindstrom | f088f43 | 2002-06-06 20:50:07 +0000 | [diff] [blame] | 51 | #if OPENSSL_VERSION_NUMBER < 0x00907000L |
Damien Miller | 3a3261f | 2003-05-15 13:37:19 +1000 | [diff] [blame^] | 52 | extern const EVP_CIPHER *evp_rijndael(void); |
| 53 | extern void ssh_rijndael_iv(EVP_CIPHER_CTX *, int, u_char *, u_int); |
Ben Lindstrom | f088f43 | 2002-06-06 20:50:07 +0000 | [diff] [blame] | 54 | #endif |
Damien Miller | 3a3261f | 2003-05-15 13:37:19 +1000 | [diff] [blame^] | 55 | extern const EVP_CIPHER *evp_ssh1_bf(void); |
| 56 | extern const EVP_CIPHER *evp_ssh1_3des(void); |
| 57 | extern void ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 58 | |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 59 | struct Cipher { |
| 60 | char *name; |
| 61 | int number; /* for ssh1 only */ |
| 62 | u_int block_size; |
| 63 | u_int key_len; |
Ben Lindstrom | 6a24641 | 2002-06-06 19:48:16 +0000 | [diff] [blame] | 64 | const EVP_CIPHER *(*evptype)(void); |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 65 | } ciphers[] = { |
| 66 | { "none", SSH_CIPHER_NONE, 8, 0, EVP_enc_null }, |
| 67 | { "des", SSH_CIPHER_DES, 8, 8, EVP_des_cbc }, |
| 68 | { "3des", SSH_CIPHER_3DES, 8, 16, evp_ssh1_3des }, |
| 69 | { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, evp_ssh1_bf }, |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 70 | |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 71 | { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, EVP_des_ede3_cbc }, |
| 72 | { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_bf_cbc }, |
| 73 | { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_cast5_cbc }, |
| 74 | { "arcfour", SSH_CIPHER_SSH2, 8, 16, EVP_rc4 }, |
Ben Lindstrom | f088f43 | 2002-06-06 20:50:07 +0000 | [diff] [blame] | 75 | #if OPENSSL_VERSION_NUMBER < 0x00907000L |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 76 | { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, evp_rijndael }, |
| 77 | { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, evp_rijndael }, |
| 78 | { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, evp_rijndael }, |
Ben Lindstrom | 8a725a8 | 2002-04-04 22:10:38 +0000 | [diff] [blame] | 79 | { "rijndael-cbc@lysator.liu.se", |
| 80 | SSH_CIPHER_SSH2, 16, 32, evp_rijndael }, |
Ben Lindstrom | f088f43 | 2002-06-06 20:50:07 +0000 | [diff] [blame] | 81 | #else |
| 82 | { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, EVP_aes_128_cbc }, |
| 83 | { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, EVP_aes_192_cbc }, |
| 84 | { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc }, |
| 85 | { "rijndael-cbc@lysator.liu.se", |
| 86 | SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc }, |
| 87 | #endif |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 88 | |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 89 | { NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 90 | }; |
| 91 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 92 | /*--*/ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 93 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 94 | u_int |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 95 | cipher_blocksize(Cipher *c) |
| 96 | { |
| 97 | return (c->block_size); |
| 98 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 99 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 100 | u_int |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 101 | cipher_keylen(Cipher *c) |
| 102 | { |
| 103 | return (c->key_len); |
| 104 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 105 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 106 | u_int |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 107 | cipher_get_number(Cipher *c) |
| 108 | { |
| 109 | return (c->number); |
| 110 | } |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 111 | |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 112 | u_int |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 113 | cipher_mask_ssh1(int client) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 114 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 115 | u_int mask = 0; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 116 | mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 117 | mask |= 1 << SSH_CIPHER_BLOWFISH; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 118 | if (client) { |
| 119 | mask |= 1 << SSH_CIPHER_DES; |
| 120 | } |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 121 | return mask; |
| 122 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 123 | |
| 124 | Cipher * |
| 125 | cipher_by_name(const char *name) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 126 | { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 127 | Cipher *c; |
| 128 | for (c = ciphers; c->name != NULL; c++) |
| 129 | if (strcasecmp(c->name, name) == 0) |
| 130 | return c; |
| 131 | return NULL; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 132 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 133 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 134 | Cipher * |
| 135 | cipher_by_number(int id) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 136 | { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 137 | Cipher *c; |
| 138 | for (c = ciphers; c->name != NULL; c++) |
| 139 | if (c->number == id) |
| 140 | return c; |
| 141 | return NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 142 | } |
| 143 | |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 144 | #define CIPHER_SEP "," |
| 145 | int |
| 146 | ciphers_valid(const char *names) |
| 147 | { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 148 | Cipher *c; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 149 | char *ciphers, *cp; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 150 | char *p; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 151 | |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 152 | if (names == NULL || strcmp(names, "") == 0) |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 153 | return 0; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 154 | ciphers = cp = xstrdup(names); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 155 | for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0'; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 156 | (p = strsep(&cp, CIPHER_SEP))) { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 157 | c = cipher_by_name(p); |
| 158 | if (c == NULL || c->number != SSH_CIPHER_SSH2) { |
| 159 | debug("bad cipher %s [%s]", p, names); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 160 | xfree(ciphers); |
| 161 | return 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 162 | } else { |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 163 | debug3("cipher ok: %s [%s]", p, names); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 164 | } |
| 165 | } |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 166 | debug3("ciphers ok: [%s]", names); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 167 | xfree(ciphers); |
| 168 | return 1; |
| 169 | } |
| 170 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 171 | /* |
| 172 | * Parses the name of the cipher. Returns the number of the corresponding |
| 173 | * cipher, or -1 on error. |
| 174 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 175 | |
| 176 | int |
| 177 | cipher_number(const char *name) |
| 178 | { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 179 | Cipher *c; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 180 | if (name == NULL) |
| 181 | return -1; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 182 | c = cipher_by_name(name); |
| 183 | return (c==NULL) ? -1 : c->number; |
| 184 | } |
| 185 | |
| 186 | char * |
| 187 | cipher_name(int id) |
| 188 | { |
| 189 | Cipher *c = cipher_by_number(id); |
| 190 | return (c==NULL) ? "<unknown>" : c->name; |
| 191 | } |
| 192 | |
| 193 | void |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 194 | cipher_init(CipherContext *cc, Cipher *cipher, |
| 195 | const u_char *key, u_int keylen, const u_char *iv, u_int ivlen, |
| 196 | int encrypt) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 197 | { |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 198 | static int dowarn = 1; |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 199 | #ifdef SSH_OLD_EVP |
| 200 | EVP_CIPHER *type; |
| 201 | #else |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 202 | const EVP_CIPHER *type; |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 203 | #endif |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 204 | int klen; |
| 205 | |
| 206 | if (cipher->number == SSH_CIPHER_DES) { |
| 207 | if (dowarn) { |
| 208 | error("Warning: use of DES is strongly discouraged " |
| 209 | "due to cryptographic weaknesses"); |
| 210 | dowarn = 0; |
| 211 | } |
| 212 | if (keylen > 8) |
| 213 | keylen = 8; |
| 214 | } |
| 215 | cc->plaintext = (cipher->number == SSH_CIPHER_NONE); |
| 216 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 217 | if (keylen < cipher->key_len) |
| 218 | fatal("cipher_init: key length %d is insufficient for %s.", |
| 219 | keylen, cipher->name); |
| 220 | if (iv != NULL && ivlen < cipher->block_size) |
| 221 | fatal("cipher_init: iv length %d is insufficient for %s.", |
| 222 | ivlen, cipher->name); |
| 223 | cc->cipher = cipher; |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 224 | |
| 225 | type = (*cipher->evptype)(); |
| 226 | |
| 227 | EVP_CIPHER_CTX_init(&cc->evp); |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 228 | #ifdef SSH_OLD_EVP |
| 229 | if (type->key_len > 0 && type->key_len != keylen) { |
| 230 | debug("cipher_init: set keylen (%d -> %d)", |
| 231 | type->key_len, keylen); |
| 232 | type->key_len = keylen; |
| 233 | } |
| 234 | EVP_CipherInit(&cc->evp, type, (u_char *)key, (u_char *)iv, |
| 235 | (encrypt == CIPHER_ENCRYPT)); |
| 236 | #else |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 237 | if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv, |
| 238 | (encrypt == CIPHER_ENCRYPT)) == 0) |
| 239 | fatal("cipher_init: EVP_CipherInit failed for %s", |
| 240 | cipher->name); |
| 241 | klen = EVP_CIPHER_CTX_key_length(&cc->evp); |
| 242 | if (klen > 0 && keylen != klen) { |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 243 | debug2("cipher_init: set keylen (%d -> %d)", klen, keylen); |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 244 | if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0) |
| 245 | fatal("cipher_init: set keylen failed (%d -> %d)", |
| 246 | klen, keylen); |
| 247 | } |
| 248 | if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0) |
| 249 | fatal("cipher_init: EVP_CipherInit: set key failed for %s", |
| 250 | cipher->name); |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 251 | #endif |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | void |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 255 | cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 256 | { |
| 257 | if (len % cc->cipher->block_size) |
| 258 | fatal("cipher_encrypt: bad plaintext length %d", len); |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 259 | #ifdef SSH_OLD_EVP |
| 260 | EVP_Cipher(&cc->evp, dest, (u_char *)src, len); |
| 261 | #else |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 262 | if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0) |
| 263 | fatal("evp_crypt: EVP_Cipher failed"); |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 264 | #endif |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 265 | } |
| 266 | |
| 267 | void |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 268 | cipher_cleanup(CipherContext *cc) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 269 | { |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 270 | #ifdef SSH_OLD_EVP |
| 271 | EVP_CIPHER_CTX_cleanup(&cc->evp); |
| 272 | #else |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 273 | if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0) |
| 274 | error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed"); |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 275 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 276 | } |
| 277 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 278 | /* |
| 279 | * Selects the cipher, and keys if by computing the MD5 checksum of the |
| 280 | * passphrase and using the resulting 16 bytes as the key. |
| 281 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 282 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 283 | void |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 284 | cipher_set_key_string(CipherContext *cc, Cipher *cipher, |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 285 | const char *passphrase, int encrypt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 286 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 287 | MD5_CTX md; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 288 | u_char digest[16]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 289 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 290 | MD5_Init(&md); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 291 | MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 292 | MD5_Final(digest, &md); |
| 293 | |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 294 | cipher_init(cc, cipher, digest, 16, NULL, 0, encrypt); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 295 | |
| 296 | memset(digest, 0, sizeof(digest)); |
| 297 | memset(&md, 0, sizeof(md)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 298 | } |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 299 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 300 | /* |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 301 | * Exports an IV from the CipherContext required to export the key |
| 302 | * state back from the unprivileged child to the privileged parent |
| 303 | * process. |
| 304 | */ |
| 305 | |
| 306 | int |
| 307 | cipher_get_keyiv_len(CipherContext *cc) |
| 308 | { |
| 309 | Cipher *c = cc->cipher; |
| 310 | int ivlen; |
| 311 | |
| 312 | if (c->number == SSH_CIPHER_3DES) |
| 313 | ivlen = 24; |
| 314 | else |
| 315 | ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp); |
| 316 | return (ivlen); |
| 317 | } |
| 318 | |
| 319 | void |
| 320 | cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len) |
| 321 | { |
| 322 | Cipher *c = cc->cipher; |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 323 | int evplen; |
| 324 | |
| 325 | switch (c->number) { |
| 326 | case SSH_CIPHER_SSH2: |
| 327 | case SSH_CIPHER_DES: |
| 328 | case SSH_CIPHER_BLOWFISH: |
| 329 | evplen = EVP_CIPHER_CTX_iv_length(&cc->evp); |
| 330 | if (evplen == 0) |
| 331 | return; |
| 332 | if (evplen != len) |
Ben Lindstrom | 7d9c38f | 2002-06-06 21:40:51 +0000 | [diff] [blame] | 333 | fatal("%s: wrong iv length %d != %d", __func__, |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 334 | evplen, len); |
Ben Lindstrom | f088f43 | 2002-06-06 20:50:07 +0000 | [diff] [blame] | 335 | #if OPENSSL_VERSION_NUMBER < 0x00907000L |
Damien Miller | a201bb3 | 2003-05-14 13:41:23 +1000 | [diff] [blame] | 336 | if (c->evptype == evp_rijndael) |
| 337 | ssh_rijndael_iv(&cc->evp, 0, iv, len); |
| 338 | else |
Ben Lindstrom | f088f43 | 2002-06-06 20:50:07 +0000 | [diff] [blame] | 339 | #endif |
Damien Miller | a201bb3 | 2003-05-14 13:41:23 +1000 | [diff] [blame] | 340 | memcpy(iv, cc->evp.iv, len); |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 341 | break; |
Damien Miller | a201bb3 | 2003-05-14 13:41:23 +1000 | [diff] [blame] | 342 | case SSH_CIPHER_3DES: |
| 343 | ssh1_3des_iv(&cc->evp, 0, iv, 24); |
| 344 | break; |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 345 | default: |
Ben Lindstrom | 7d9c38f | 2002-06-06 21:40:51 +0000 | [diff] [blame] | 346 | fatal("%s: bad cipher %d", __func__, c->number); |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 347 | } |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | void |
| 351 | cipher_set_keyiv(CipherContext *cc, u_char *iv) |
| 352 | { |
| 353 | Cipher *c = cc->cipher; |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 354 | int evplen = 0; |
| 355 | |
| 356 | switch (c->number) { |
| 357 | case SSH_CIPHER_SSH2: |
| 358 | case SSH_CIPHER_DES: |
| 359 | case SSH_CIPHER_BLOWFISH: |
| 360 | evplen = EVP_CIPHER_CTX_iv_length(&cc->evp); |
| 361 | if (evplen == 0) |
| 362 | return; |
Ben Lindstrom | f088f43 | 2002-06-06 20:50:07 +0000 | [diff] [blame] | 363 | #if OPENSSL_VERSION_NUMBER < 0x00907000L |
Damien Miller | a201bb3 | 2003-05-14 13:41:23 +1000 | [diff] [blame] | 364 | if (c->evptype == evp_rijndael) |
| 365 | ssh_rijndael_iv(&cc->evp, 1, iv, evplen); |
| 366 | else |
Ben Lindstrom | f088f43 | 2002-06-06 20:50:07 +0000 | [diff] [blame] | 367 | #endif |
Damien Miller | a201bb3 | 2003-05-14 13:41:23 +1000 | [diff] [blame] | 368 | memcpy(cc->evp.iv, iv, evplen); |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 369 | break; |
Damien Miller | a201bb3 | 2003-05-14 13:41:23 +1000 | [diff] [blame] | 370 | case SSH_CIPHER_3DES: |
| 371 | ssh1_3des_iv(&cc->evp, 1, iv, 24); |
| 372 | break; |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 373 | default: |
Ben Lindstrom | 7d9c38f | 2002-06-06 21:40:51 +0000 | [diff] [blame] | 374 | fatal("%s: bad cipher %d", __func__, c->number); |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 375 | } |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | #if OPENSSL_VERSION_NUMBER < 0x00907000L |
| 379 | #define EVP_X_STATE(evp) &(evp).c |
| 380 | #define EVP_X_STATE_LEN(evp) sizeof((evp).c) |
| 381 | #else |
| 382 | #define EVP_X_STATE(evp) (evp).cipher_data |
| 383 | #define EVP_X_STATE_LEN(evp) (evp).cipher->ctx_size |
| 384 | #endif |
| 385 | |
| 386 | int |
| 387 | cipher_get_keycontext(CipherContext *cc, u_char *dat) |
| 388 | { |
| 389 | Cipher *c = cc->cipher; |
Ben Lindstrom | 402c6cc | 2002-06-21 00:43:42 +0000 | [diff] [blame] | 390 | int plen = 0; |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 391 | |
Ben Lindstrom | 402c6cc | 2002-06-21 00:43:42 +0000 | [diff] [blame] | 392 | if (c->evptype == EVP_rc4) { |
| 393 | plen = EVP_X_STATE_LEN(cc->evp); |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 394 | if (dat == NULL) |
Ben Lindstrom | 402c6cc | 2002-06-21 00:43:42 +0000 | [diff] [blame] | 395 | return (plen); |
| 396 | memcpy(dat, EVP_X_STATE(cc->evp), plen); |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 397 | } |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 398 | return (plen); |
| 399 | } |
| 400 | |
| 401 | void |
| 402 | cipher_set_keycontext(CipherContext *cc, u_char *dat) |
| 403 | { |
| 404 | Cipher *c = cc->cipher; |
| 405 | int plen; |
| 406 | |
Ben Lindstrom | 402c6cc | 2002-06-21 00:43:42 +0000 | [diff] [blame] | 407 | if (c->evptype == EVP_rc4) { |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 408 | plen = EVP_X_STATE_LEN(cc->evp); |
| 409 | memcpy(EVP_X_STATE(cc->evp), dat, plen); |
| 410 | } |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 411 | } |