Damien Miller | 57c3011 | 2006-03-26 14:24:48 +1100 | [diff] [blame] | 1 | /* $OpenBSD: cipher.c,v 1.79 2006/03/25 13:17:01 djm Exp $ */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 6 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 7 | * As far as I am concerned, the code I have written for this software |
| 8 | * can be used freely for any purpose. Any derived versions of this |
| 9 | * software must be clearly marked as such, and if the derived work is |
| 10 | * incompatible with the protocol description in the RFC file, it must be |
| 11 | * called by a name other than "ssh" or "Secure Shell". |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 12 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 13 | * |
| 14 | * Copyright (c) 1999 Niels Provos. All rights reserved. |
Ben Lindstrom | 4469723 | 2001-07-04 03:32:30 +0000 | [diff] [blame] | 15 | * Copyright (c) 1999, 2000 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 16 | * |
| 17 | * Redistribution and use in source and binary forms, with or without |
| 18 | * modification, are permitted provided that the following conditions |
| 19 | * are met: |
| 20 | * 1. Redistributions of source code must retain the above copyright |
| 21 | * notice, this list of conditions and the following disclaimer. |
| 22 | * 2. Redistributions in binary form must reproduce the above copyright |
| 23 | * notice, this list of conditions and the following disclaimer in the |
| 24 | * documentation and/or other materials provided with the distribution. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 27 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 28 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 29 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 30 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 31 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 32 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 33 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 34 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 35 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 36 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 37 | |
| 38 | #include "includes.h" |
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 | |
Darren Tucker | f0bd352 | 2005-06-17 21:15:20 +1000 | [diff] [blame] | 46 | /* compatibility with old or broken OpenSSL versions */ |
| 47 | #include "openbsd-compat/openssl-compat.h" |
| 48 | |
Damien Miller | 3a3261f | 2003-05-15 13:37:19 +1000 | [diff] [blame] | 49 | extern const EVP_CIPHER *evp_ssh1_bf(void); |
| 50 | extern const EVP_CIPHER *evp_ssh1_3des(void); |
| 51 | extern void ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int); |
Damien Miller | f5399c2 | 2003-05-18 20:53:59 +1000 | [diff] [blame] | 52 | extern const EVP_CIPHER *evp_aes_128_ctr(void); |
| 53 | extern void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, int, u_char *, u_int); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 54 | |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 55 | struct Cipher { |
| 56 | char *name; |
| 57 | int number; /* for ssh1 only */ |
| 58 | u_int block_size; |
| 59 | u_int key_len; |
Damien Miller | 3710f27 | 2005-05-26 12:19:17 +1000 | [diff] [blame] | 60 | u_int discard_len; |
Ben Lindstrom | 6a24641 | 2002-06-06 19:48:16 +0000 | [diff] [blame] | 61 | const EVP_CIPHER *(*evptype)(void); |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 62 | } ciphers[] = { |
Damien Miller | 3710f27 | 2005-05-26 12:19:17 +1000 | [diff] [blame] | 63 | { "none", SSH_CIPHER_NONE, 8, 0, 0, EVP_enc_null }, |
| 64 | { "des", SSH_CIPHER_DES, 8, 8, 0, EVP_des_cbc }, |
| 65 | { "3des", SSH_CIPHER_3DES, 8, 16, 0, evp_ssh1_3des }, |
| 66 | { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, 0, evp_ssh1_bf }, |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 67 | |
Damien Miller | 3710f27 | 2005-05-26 12:19:17 +1000 | [diff] [blame] | 68 | { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, 0, EVP_des_ede3_cbc }, |
| 69 | { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, 0, EVP_bf_cbc }, |
| 70 | { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, 0, EVP_cast5_cbc }, |
| 71 | { "arcfour", SSH_CIPHER_SSH2, 8, 16, 0, EVP_rc4 }, |
| 72 | { "arcfour128", SSH_CIPHER_SSH2, 8, 16, 1536, EVP_rc4 }, |
| 73 | { "arcfour256", SSH_CIPHER_SSH2, 8, 32, 1536, EVP_rc4 }, |
Damien Miller | 3710f27 | 2005-05-26 12:19:17 +1000 | [diff] [blame] | 74 | { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, 0, EVP_aes_128_cbc }, |
| 75 | { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, 0, EVP_aes_192_cbc }, |
| 76 | { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, 0, EVP_aes_256_cbc }, |
Ben Lindstrom | f088f43 | 2002-06-06 20:50:07 +0000 | [diff] [blame] | 77 | { "rijndael-cbc@lysator.liu.se", |
Damien Miller | 3710f27 | 2005-05-26 12:19:17 +1000 | [diff] [blame] | 78 | SSH_CIPHER_SSH2, 16, 32, 0, EVP_aes_256_cbc }, |
Damien Miller | 3710f27 | 2005-05-26 12:19:17 +1000 | [diff] [blame] | 79 | { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, evp_aes_128_ctr }, |
| 80 | { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, evp_aes_128_ctr }, |
| 81 | { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, evp_aes_128_ctr }, |
Darren Tucker | a55ec77 | 2005-06-09 21:45:10 +1000 | [diff] [blame] | 82 | #ifdef USE_CIPHER_ACSS |
Damien Miller | 3710f27 | 2005-05-26 12:19:17 +1000 | [diff] [blame] | 83 | { "acss@openssh.org", SSH_CIPHER_SSH2, 16, 5, 0, EVP_acss }, |
Damien Miller | 4f0fe68 | 2004-01-27 21:19:21 +1100 | [diff] [blame] | 84 | #endif |
Damien Miller | 3710f27 | 2005-05-26 12:19:17 +1000 | [diff] [blame] | 85 | { NULL, SSH_CIPHER_INVALID, 0, 0, 0, NULL } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 86 | }; |
| 87 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 88 | /*--*/ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 89 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 90 | u_int |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 91 | cipher_blocksize(const Cipher *c) |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 92 | { |
| 93 | return (c->block_size); |
| 94 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 95 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 96 | u_int |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 97 | cipher_keylen(const Cipher *c) |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 98 | { |
| 99 | return (c->key_len); |
| 100 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 101 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 102 | u_int |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 103 | cipher_get_number(const Cipher *c) |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 104 | { |
| 105 | return (c->number); |
| 106 | } |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 107 | |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 108 | u_int |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 109 | cipher_mask_ssh1(int client) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 110 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 111 | u_int mask = 0; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 112 | mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 113 | mask |= 1 << SSH_CIPHER_BLOWFISH; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 114 | if (client) { |
| 115 | mask |= 1 << SSH_CIPHER_DES; |
| 116 | } |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 117 | return mask; |
| 118 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 119 | |
| 120 | Cipher * |
| 121 | cipher_by_name(const char *name) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 122 | { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 123 | Cipher *c; |
| 124 | for (c = ciphers; c->name != NULL; c++) |
Darren Tucker | 660db78 | 2005-01-24 21:57:11 +1100 | [diff] [blame] | 125 | if (strcmp(c->name, name) == 0) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 126 | return c; |
| 127 | return NULL; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 128 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 129 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 130 | Cipher * |
| 131 | cipher_by_number(int id) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 132 | { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 133 | Cipher *c; |
| 134 | for (c = ciphers; c->name != NULL; c++) |
| 135 | if (c->number == id) |
| 136 | return c; |
| 137 | return NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 138 | } |
| 139 | |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 140 | #define CIPHER_SEP "," |
| 141 | int |
| 142 | ciphers_valid(const char *names) |
| 143 | { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 144 | Cipher *c; |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 145 | char *cipher_list, *cp; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 146 | char *p; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 147 | |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 148 | if (names == NULL || strcmp(names, "") == 0) |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 149 | return 0; |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 150 | cipher_list = cp = xstrdup(names); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 151 | for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0'; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 152 | (p = strsep(&cp, CIPHER_SEP))) { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 153 | c = cipher_by_name(p); |
| 154 | if (c == NULL || c->number != SSH_CIPHER_SSH2) { |
| 155 | debug("bad cipher %s [%s]", p, names); |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 156 | xfree(cipher_list); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 157 | return 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 158 | } else { |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 159 | debug3("cipher ok: %s [%s]", p, names); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 160 | } |
| 161 | } |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 162 | debug3("ciphers ok: [%s]", names); |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 163 | xfree(cipher_list); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 164 | return 1; |
| 165 | } |
| 166 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 167 | /* |
| 168 | * Parses the name of the cipher. Returns the number of the corresponding |
| 169 | * cipher, or -1 on error. |
| 170 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 171 | |
| 172 | int |
| 173 | cipher_number(const char *name) |
| 174 | { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 175 | Cipher *c; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 176 | if (name == NULL) |
| 177 | return -1; |
Darren Tucker | 660db78 | 2005-01-24 21:57:11 +1100 | [diff] [blame] | 178 | for (c = ciphers; c->name != NULL; c++) |
| 179 | if (strcasecmp(c->name, name) == 0) |
| 180 | return c->number; |
| 181 | return -1; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | char * |
| 185 | cipher_name(int id) |
| 186 | { |
| 187 | Cipher *c = cipher_by_number(id); |
| 188 | return (c==NULL) ? "<unknown>" : c->name; |
| 189 | } |
| 190 | |
| 191 | void |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 192 | cipher_init(CipherContext *cc, Cipher *cipher, |
| 193 | const u_char *key, u_int keylen, const u_char *iv, u_int ivlen, |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 194 | int do_encrypt) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 195 | { |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 196 | static int dowarn = 1; |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 197 | #ifdef SSH_OLD_EVP |
| 198 | EVP_CIPHER *type; |
| 199 | #else |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 200 | const EVP_CIPHER *type; |
| 201 | int klen; |
Darren Tucker | a55ec77 | 2005-06-09 21:45:10 +1000 | [diff] [blame] | 202 | #endif |
Damien Miller | 3710f27 | 2005-05-26 12:19:17 +1000 | [diff] [blame] | 203 | u_char *junk, *discard; |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 204 | |
| 205 | if (cipher->number == SSH_CIPHER_DES) { |
| 206 | if (dowarn) { |
| 207 | error("Warning: use of DES is strongly discouraged " |
| 208 | "due to cryptographic weaknesses"); |
| 209 | dowarn = 0; |
| 210 | } |
| 211 | if (keylen > 8) |
| 212 | keylen = 8; |
| 213 | } |
| 214 | cc->plaintext = (cipher->number == SSH_CIPHER_NONE); |
| 215 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 216 | if (keylen < cipher->key_len) |
| 217 | fatal("cipher_init: key length %d is insufficient for %s.", |
| 218 | keylen, cipher->name); |
| 219 | if (iv != NULL && ivlen < cipher->block_size) |
| 220 | fatal("cipher_init: iv length %d is insufficient for %s.", |
| 221 | ivlen, cipher->name); |
| 222 | cc->cipher = cipher; |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 223 | |
| 224 | type = (*cipher->evptype)(); |
| 225 | |
| 226 | EVP_CIPHER_CTX_init(&cc->evp); |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 227 | #ifdef SSH_OLD_EVP |
| 228 | if (type->key_len > 0 && type->key_len != keylen) { |
| 229 | debug("cipher_init: set keylen (%d -> %d)", |
| 230 | type->key_len, keylen); |
| 231 | type->key_len = keylen; |
| 232 | } |
| 233 | EVP_CipherInit(&cc->evp, type, (u_char *)key, (u_char *)iv, |
Darren Tucker | e5a604f | 2004-06-23 12:28:31 +1000 | [diff] [blame] | 234 | (do_encrypt == CIPHER_ENCRYPT)); |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 235 | #else |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 236 | if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv, |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 237 | (do_encrypt == CIPHER_ENCRYPT)) == 0) |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 238 | fatal("cipher_init: EVP_CipherInit failed for %s", |
| 239 | cipher->name); |
| 240 | klen = EVP_CIPHER_CTX_key_length(&cc->evp); |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 241 | if (klen > 0 && keylen != (u_int)klen) { |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 242 | debug2("cipher_init: set keylen (%d -> %d)", klen, keylen); |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 243 | if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0) |
| 244 | fatal("cipher_init: set keylen failed (%d -> %d)", |
| 245 | klen, keylen); |
| 246 | } |
| 247 | if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0) |
| 248 | fatal("cipher_init: EVP_CipherInit: set key failed for %s", |
| 249 | cipher->name); |
Damien Miller | c7375ac | 2002-03-11 10:51:17 +1100 | [diff] [blame] | 250 | #endif |
Damien Miller | 3710f27 | 2005-05-26 12:19:17 +1000 | [diff] [blame] | 251 | |
Damien Miller | 46d38de | 2005-07-17 17:02:09 +1000 | [diff] [blame] | 252 | if (cipher->discard_len > 0) { |
Damien Miller | 3710f27 | 2005-05-26 12:19:17 +1000 | [diff] [blame] | 253 | junk = xmalloc(cipher->discard_len); |
| 254 | discard = xmalloc(cipher->discard_len); |
| 255 | if (EVP_Cipher(&cc->evp, discard, junk, |
| 256 | cipher->discard_len) == 0) |
| 257 | fatal("evp_crypt: EVP_Cipher failed during discard"); |
| 258 | memset(discard, 0, cipher->discard_len); |
| 259 | xfree(junk); |
| 260 | xfree(discard); |
| 261 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 262 | } |
| 263 | |
| 264 | void |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 265 | 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] | 266 | { |
| 267 | if (len % cc->cipher->block_size) |
| 268 | fatal("cipher_encrypt: bad plaintext length %d", len); |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 269 | if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0) |
| 270 | fatal("evp_crypt: EVP_Cipher failed"); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | void |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 274 | cipher_cleanup(CipherContext *cc) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 275 | { |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 276 | if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0) |
| 277 | error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 278 | } |
| 279 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 280 | /* |
| 281 | * Selects the cipher, and keys if by computing the MD5 checksum of the |
| 282 | * passphrase and using the resulting 16 bytes as the key. |
| 283 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 284 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 285 | void |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 286 | cipher_set_key_string(CipherContext *cc, Cipher *cipher, |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 287 | const char *passphrase, int do_encrypt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 288 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 289 | MD5_CTX md; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 290 | u_char digest[16]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 291 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 292 | MD5_Init(&md); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 293 | MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 294 | MD5_Final(digest, &md); |
| 295 | |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 296 | cipher_init(cc, cipher, digest, 16, NULL, 0, do_encrypt); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 297 | |
| 298 | memset(digest, 0, sizeof(digest)); |
| 299 | memset(&md, 0, sizeof(md)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 300 | } |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 301 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 302 | /* |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 303 | * Exports an IV from the CipherContext required to export the key |
| 304 | * state back from the unprivileged child to the privileged parent |
| 305 | * process. |
| 306 | */ |
| 307 | |
| 308 | int |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 309 | cipher_get_keyiv_len(const CipherContext *cc) |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 310 | { |
| 311 | Cipher *c = cc->cipher; |
| 312 | int ivlen; |
| 313 | |
| 314 | if (c->number == SSH_CIPHER_3DES) |
| 315 | ivlen = 24; |
| 316 | else |
| 317 | ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp); |
| 318 | return (ivlen); |
| 319 | } |
| 320 | |
| 321 | void |
| 322 | cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len) |
| 323 | { |
| 324 | Cipher *c = cc->cipher; |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 325 | int evplen; |
| 326 | |
| 327 | switch (c->number) { |
| 328 | case SSH_CIPHER_SSH2: |
| 329 | case SSH_CIPHER_DES: |
| 330 | case SSH_CIPHER_BLOWFISH: |
| 331 | evplen = EVP_CIPHER_CTX_iv_length(&cc->evp); |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 332 | if (evplen <= 0) |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 333 | return; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 334 | if ((u_int)evplen != len) |
Ben Lindstrom | 7d9c38f | 2002-06-06 21:40:51 +0000 | [diff] [blame] | 335 | fatal("%s: wrong iv length %d != %d", __func__, |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 336 | evplen, len); |
Darren Tucker | 129d0bb | 2005-12-19 17:40:40 +1100 | [diff] [blame] | 337 | #ifdef USE_BUILTIN_RIJNDAEL |
Damien Miller | a201bb3 | 2003-05-14 13:41:23 +1000 | [diff] [blame] | 338 | if (c->evptype == evp_rijndael) |
| 339 | ssh_rijndael_iv(&cc->evp, 0, iv, len); |
| 340 | else |
Ben Lindstrom | f088f43 | 2002-06-06 20:50:07 +0000 | [diff] [blame] | 341 | #endif |
Damien Miller | f5399c2 | 2003-05-18 20:53:59 +1000 | [diff] [blame] | 342 | if (c->evptype == evp_aes_128_ctr) |
| 343 | ssh_aes_ctr_iv(&cc->evp, 0, iv, len); |
| 344 | else |
Damien Miller | a201bb3 | 2003-05-14 13:41:23 +1000 | [diff] [blame] | 345 | memcpy(iv, cc->evp.iv, len); |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 346 | break; |
Damien Miller | a201bb3 | 2003-05-14 13:41:23 +1000 | [diff] [blame] | 347 | case SSH_CIPHER_3DES: |
| 348 | ssh1_3des_iv(&cc->evp, 0, iv, 24); |
| 349 | break; |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 350 | default: |
Ben Lindstrom | 7d9c38f | 2002-06-06 21:40:51 +0000 | [diff] [blame] | 351 | fatal("%s: bad cipher %d", __func__, c->number); |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 352 | } |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 353 | } |
| 354 | |
| 355 | void |
| 356 | cipher_set_keyiv(CipherContext *cc, u_char *iv) |
| 357 | { |
| 358 | Cipher *c = cc->cipher; |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 359 | int evplen = 0; |
| 360 | |
| 361 | switch (c->number) { |
| 362 | case SSH_CIPHER_SSH2: |
| 363 | case SSH_CIPHER_DES: |
| 364 | case SSH_CIPHER_BLOWFISH: |
| 365 | evplen = EVP_CIPHER_CTX_iv_length(&cc->evp); |
| 366 | if (evplen == 0) |
| 367 | return; |
Darren Tucker | 129d0bb | 2005-12-19 17:40:40 +1100 | [diff] [blame] | 368 | #ifdef USE_BUILTIN_RIJNDAEL |
Damien Miller | a201bb3 | 2003-05-14 13:41:23 +1000 | [diff] [blame] | 369 | if (c->evptype == evp_rijndael) |
| 370 | ssh_rijndael_iv(&cc->evp, 1, iv, evplen); |
| 371 | else |
Ben Lindstrom | f088f43 | 2002-06-06 20:50:07 +0000 | [diff] [blame] | 372 | #endif |
Damien Miller | f5399c2 | 2003-05-18 20:53:59 +1000 | [diff] [blame] | 373 | if (c->evptype == evp_aes_128_ctr) |
| 374 | ssh_aes_ctr_iv(&cc->evp, 1, iv, evplen); |
| 375 | else |
Damien Miller | a201bb3 | 2003-05-14 13:41:23 +1000 | [diff] [blame] | 376 | memcpy(cc->evp.iv, iv, evplen); |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 377 | break; |
Damien Miller | a201bb3 | 2003-05-14 13:41:23 +1000 | [diff] [blame] | 378 | case SSH_CIPHER_3DES: |
| 379 | ssh1_3des_iv(&cc->evp, 1, iv, 24); |
| 380 | break; |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 381 | default: |
Ben Lindstrom | 7d9c38f | 2002-06-06 21:40:51 +0000 | [diff] [blame] | 382 | fatal("%s: bad cipher %d", __func__, c->number); |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 383 | } |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | #if OPENSSL_VERSION_NUMBER < 0x00907000L |
| 387 | #define EVP_X_STATE(evp) &(evp).c |
| 388 | #define EVP_X_STATE_LEN(evp) sizeof((evp).c) |
| 389 | #else |
| 390 | #define EVP_X_STATE(evp) (evp).cipher_data |
| 391 | #define EVP_X_STATE_LEN(evp) (evp).cipher->ctx_size |
| 392 | #endif |
| 393 | |
| 394 | int |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 395 | cipher_get_keycontext(const CipherContext *cc, u_char *dat) |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 396 | { |
| 397 | Cipher *c = cc->cipher; |
Ben Lindstrom | 402c6cc | 2002-06-21 00:43:42 +0000 | [diff] [blame] | 398 | int plen = 0; |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 399 | |
Damien Miller | 4f0fe68 | 2004-01-27 21:19:21 +1100 | [diff] [blame] | 400 | if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) { |
Ben Lindstrom | 402c6cc | 2002-06-21 00:43:42 +0000 | [diff] [blame] | 401 | plen = EVP_X_STATE_LEN(cc->evp); |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 402 | if (dat == NULL) |
Ben Lindstrom | 402c6cc | 2002-06-21 00:43:42 +0000 | [diff] [blame] | 403 | return (plen); |
| 404 | memcpy(dat, EVP_X_STATE(cc->evp), plen); |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 405 | } |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 406 | return (plen); |
| 407 | } |
| 408 | |
| 409 | void |
| 410 | cipher_set_keycontext(CipherContext *cc, u_char *dat) |
| 411 | { |
| 412 | Cipher *c = cc->cipher; |
| 413 | int plen; |
| 414 | |
Damien Miller | 4f0fe68 | 2004-01-27 21:19:21 +1100 | [diff] [blame] | 415 | if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) { |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 416 | plen = EVP_X_STATE_LEN(cc->evp); |
| 417 | memcpy(EVP_X_STATE(cc->evp), dat, plen); |
| 418 | } |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 419 | } |