dtucker@openbsd.org | 7f8e66f | 2020-01-23 10:24:29 +0000 | [diff] [blame] | 1 | /* $OpenBSD: cipher.c,v 1.114 2020/01/23 10:24:29 dtucker 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 | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 40 | #include <sys/types.h> |
| 41 | |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 42 | #include <string.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 43 | #include <stdarg.h> |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 44 | #include <stdio.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 45 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 46 | #include "cipher.h" |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 47 | #include "misc.h" |
| 48 | #include "sshbuf.h" |
| 49 | #include "ssherr.h" |
Damien Miller | 4a1c7aa | 2014-02-04 11:03:36 +1100 | [diff] [blame] | 50 | #include "digest.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 51 | |
Darren Tucker | 5573171 | 2014-07-21 02:24:59 +1000 | [diff] [blame] | 52 | #include "openbsd-compat/openssl-compat.h" |
| 53 | |
djm@openbsd.org | 670104b | 2019-09-06 05:23:55 +0000 | [diff] [blame] | 54 | #ifndef WITH_OPENSSL |
| 55 | #define EVP_CIPHER_CTX void |
| 56 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 57 | |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 58 | struct sshcipher_ctx { |
| 59 | int plaintext; |
| 60 | int encrypt; |
| 61 | EVP_CIPHER_CTX *evp; |
| 62 | struct chachapoly_ctx cp_ctx; /* XXX union with evp? */ |
| 63 | struct aesctr_ctx ac_ctx; /* XXX union with evp? */ |
| 64 | const struct sshcipher *cipher; |
| 65 | }; |
| 66 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 67 | struct sshcipher { |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 68 | char *name; |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 69 | u_int block_size; |
| 70 | u_int key_len; |
Damien Miller | d522c68 | 2013-01-09 16:42:47 +1100 | [diff] [blame] | 71 | u_int iv_len; /* defaults to block_size */ |
| 72 | u_int auth_len; |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 73 | u_int flags; |
| 74 | #define CFLAG_CBC (1<<0) |
| 75 | #define CFLAG_CHACHAPOLY (1<<1) |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 76 | #define CFLAG_AESCTR (1<<2) |
| 77 | #define CFLAG_NONE (1<<3) |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 78 | #define CFLAG_INTERNAL CFLAG_NONE /* Don't use "none" for packets */ |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 79 | #ifdef WITH_OPENSSL |
Ben Lindstrom | 6a24641 | 2002-06-06 19:48:16 +0000 | [diff] [blame] | 80 | const EVP_CIPHER *(*evptype)(void); |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 81 | #else |
| 82 | void *ignored; |
| 83 | #endif |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 84 | }; |
| 85 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 86 | static const struct sshcipher ciphers[] = { |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 87 | #ifdef WITH_OPENSSL |
Darren Tucker | cec3389 | 2018-04-19 09:53:14 +1000 | [diff] [blame] | 88 | #ifndef OPENSSL_NO_DES |
djm@openbsd.org | acaf34f | 2017-05-07 23:12:57 +0000 | [diff] [blame] | 89 | { "3des-cbc", 8, 24, 0, 0, CFLAG_CBC, EVP_des_ede3_cbc }, |
Darren Tucker | cec3389 | 2018-04-19 09:53:14 +1000 | [diff] [blame] | 90 | #endif |
djm@openbsd.org | acaf34f | 2017-05-07 23:12:57 +0000 | [diff] [blame] | 91 | { "aes128-cbc", 16, 16, 0, 0, CFLAG_CBC, EVP_aes_128_cbc }, |
| 92 | { "aes192-cbc", 16, 24, 0, 0, CFLAG_CBC, EVP_aes_192_cbc }, |
| 93 | { "aes256-cbc", 16, 32, 0, 0, CFLAG_CBC, EVP_aes_256_cbc }, |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 94 | { "rijndael-cbc@lysator.liu.se", |
djm@openbsd.org | acaf34f | 2017-05-07 23:12:57 +0000 | [diff] [blame] | 95 | 16, 32, 0, 0, CFLAG_CBC, EVP_aes_256_cbc }, |
| 96 | { "aes128-ctr", 16, 16, 0, 0, 0, EVP_aes_128_ctr }, |
| 97 | { "aes192-ctr", 16, 24, 0, 0, 0, EVP_aes_192_ctr }, |
| 98 | { "aes256-ctr", 16, 32, 0, 0, 0, EVP_aes_256_ctr }, |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 99 | # ifdef OPENSSL_HAVE_EVPGCM |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 100 | { "aes128-gcm@openssh.com", |
djm@openbsd.org | acaf34f | 2017-05-07 23:12:57 +0000 | [diff] [blame] | 101 | 16, 16, 12, 16, 0, EVP_aes_128_gcm }, |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 102 | { "aes256-gcm@openssh.com", |
djm@openbsd.org | acaf34f | 2017-05-07 23:12:57 +0000 | [diff] [blame] | 103 | 16, 32, 12, 16, 0, EVP_aes_256_gcm }, |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 104 | # endif /* OPENSSL_HAVE_EVPGCM */ |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 105 | #else |
djm@openbsd.org | acaf34f | 2017-05-07 23:12:57 +0000 | [diff] [blame] | 106 | { "aes128-ctr", 16, 16, 0, 0, CFLAG_AESCTR, NULL }, |
| 107 | { "aes192-ctr", 16, 24, 0, 0, CFLAG_AESCTR, NULL }, |
| 108 | { "aes256-ctr", 16, 32, 0, 0, CFLAG_AESCTR, NULL }, |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 109 | #endif |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 110 | { "chacha20-poly1305@openssh.com", |
djm@openbsd.org | acaf34f | 2017-05-07 23:12:57 +0000 | [diff] [blame] | 111 | 8, 64, 0, 16, CFLAG_CHACHAPOLY, NULL }, |
| 112 | { "none", 8, 0, 0, 0, CFLAG_NONE, NULL }, |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 113 | |
djm@openbsd.org | acaf34f | 2017-05-07 23:12:57 +0000 | [diff] [blame] | 114 | { NULL, 0, 0, 0, 0, 0, NULL } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 115 | }; |
| 116 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 117 | /*--*/ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 118 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 119 | /* Returns a comma-separated list of supported ciphers. */ |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 120 | char * |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 121 | cipher_alg_list(char sep, int auth_only) |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 122 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 123 | char *tmp, *ret = NULL; |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 124 | size_t nlen, rlen = 0; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 125 | const struct sshcipher *c; |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 126 | |
| 127 | for (c = ciphers; c->name != NULL; c++) { |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 128 | if ((c->flags & CFLAG_INTERNAL) != 0) |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 129 | continue; |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 130 | if (auth_only && c->auth_len == 0) |
| 131 | continue; |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 132 | if (ret != NULL) |
Damien Miller | 690d989 | 2013-11-08 12:16:49 +1100 | [diff] [blame] | 133 | ret[rlen++] = sep; |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 134 | nlen = strlen(c->name); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 135 | if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) { |
| 136 | free(ret); |
| 137 | return NULL; |
| 138 | } |
| 139 | ret = tmp; |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 140 | memcpy(ret + rlen, c->name, nlen + 1); |
| 141 | rlen += nlen; |
| 142 | } |
| 143 | return ret; |
| 144 | } |
| 145 | |
dtucker@openbsd.org | 7f8e66f | 2020-01-23 10:24:29 +0000 | [diff] [blame] | 146 | const char * |
| 147 | compression_alg_list(int compression) |
| 148 | { |
| 149 | #ifdef WITH_ZLIB |
| 150 | return compression ? "zlib@openssh.com,zlib,none" : |
| 151 | "none,zlib@openssh.com,zlib"; |
| 152 | #else |
| 153 | return "none"; |
| 154 | #endif |
| 155 | } |
| 156 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 157 | u_int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 158 | cipher_blocksize(const struct sshcipher *c) |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 159 | { |
| 160 | return (c->block_size); |
| 161 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 162 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 163 | u_int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 164 | cipher_keylen(const struct sshcipher *c) |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 165 | { |
| 166 | return (c->key_len); |
| 167 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 168 | |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 169 | u_int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 170 | cipher_seclen(const struct sshcipher *c) |
Damien Miller | 76eea4a | 2014-01-26 09:37:25 +1100 | [diff] [blame] | 171 | { |
| 172 | if (strcmp("3des-cbc", c->name) == 0) |
| 173 | return 14; |
| 174 | return cipher_keylen(c); |
| 175 | } |
| 176 | |
| 177 | u_int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 178 | cipher_authlen(const struct sshcipher *c) |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 179 | { |
| 180 | return (c->auth_len); |
| 181 | } |
| 182 | |
| 183 | u_int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 184 | cipher_ivlen(const struct sshcipher *c) |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 185 | { |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 186 | /* |
| 187 | * Default is cipher block size, except for chacha20+poly1305 that |
| 188 | * needs no IV. XXX make iv_len == -1 default? |
| 189 | */ |
| 190 | return (c->iv_len != 0 || (c->flags & CFLAG_CHACHAPOLY) != 0) ? |
| 191 | c->iv_len : c->block_size; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | u_int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 195 | cipher_is_cbc(const struct sshcipher *c) |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 196 | { |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 197 | return (c->flags & CFLAG_CBC) != 0; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 198 | } |
| 199 | |
| 200 | u_int |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 201 | cipher_ctx_is_plaintext(struct sshcipher_ctx *cc) |
| 202 | { |
| 203 | return cc->plaintext; |
| 204 | } |
| 205 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 206 | const struct sshcipher * |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 207 | cipher_by_name(const char *name) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 208 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 209 | const struct sshcipher *c; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 210 | for (c = ciphers; c->name != NULL; c++) |
Darren Tucker | 660db78 | 2005-01-24 21:57:11 +1100 | [diff] [blame] | 211 | if (strcmp(c->name, name) == 0) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 212 | return c; |
| 213 | return NULL; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 214 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 215 | |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 216 | #define CIPHER_SEP "," |
| 217 | int |
| 218 | ciphers_valid(const char *names) |
| 219 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 220 | const struct sshcipher *c; |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 221 | char *cipher_list, *cp; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 222 | char *p; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 223 | |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 224 | if (names == NULL || strcmp(names, "") == 0) |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 225 | return 0; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 226 | if ((cipher_list = cp = strdup(names)) == NULL) |
| 227 | return 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 228 | for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0'; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 229 | (p = strsep(&cp, CIPHER_SEP))) { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 230 | c = cipher_by_name(p); |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 231 | if (c == NULL || (c->flags & CFLAG_INTERNAL) != 0) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 232 | free(cipher_list); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 233 | return 0; |
| 234 | } |
| 235 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 236 | free(cipher_list); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 237 | return 1; |
| 238 | } |
| 239 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 240 | const char * |
| 241 | cipher_warning_message(const struct sshcipher_ctx *cc) |
| 242 | { |
| 243 | if (cc == NULL || cc->cipher == NULL) |
| 244 | return NULL; |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 245 | /* XXX repurpose for CBC warning */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 246 | return NULL; |
| 247 | } |
| 248 | |
| 249 | int |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 250 | cipher_init(struct sshcipher_ctx **ccp, const struct sshcipher *cipher, |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 251 | 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] | 252 | int do_encrypt) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 253 | { |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 254 | struct sshcipher_ctx *cc = NULL; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 255 | int ret = SSH_ERR_INTERNAL_ERROR; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 256 | #ifdef WITH_OPENSSL |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 257 | const EVP_CIPHER *type; |
| 258 | int klen; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 259 | #endif |
| 260 | |
| 261 | *ccp = NULL; |
| 262 | if ((cc = calloc(sizeof(*cc), 1)) == NULL) |
| 263 | return SSH_ERR_ALLOC_FAIL; |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 264 | |
djm@openbsd.org | e77e156 | 2017-05-01 00:03:18 +0000 | [diff] [blame] | 265 | cc->plaintext = (cipher->flags & CFLAG_NONE) != 0; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 266 | cc->encrypt = do_encrypt; |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 267 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 268 | if (keylen < cipher->key_len || |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 269 | (iv != NULL && ivlen < cipher_ivlen(cipher))) { |
| 270 | ret = SSH_ERR_INVALID_ARGUMENT; |
| 271 | goto out; |
| 272 | } |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 273 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 274 | cc->cipher = cipher; |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 275 | if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) { |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 276 | ret = chachapoly_init(&cc->cp_ctx, key, keylen); |
| 277 | goto out; |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 278 | } |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 279 | if ((cc->cipher->flags & CFLAG_NONE) != 0) { |
| 280 | ret = 0; |
| 281 | goto out; |
| 282 | } |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 283 | #ifndef WITH_OPENSSL |
| 284 | if ((cc->cipher->flags & CFLAG_AESCTR) != 0) { |
| 285 | aesctr_keysetup(&cc->ac_ctx, key, 8 * keylen, 8 * ivlen); |
| 286 | aesctr_ivsetup(&cc->ac_ctx, iv); |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 287 | ret = 0; |
| 288 | goto out; |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 289 | } |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 290 | ret = SSH_ERR_INVALID_ARGUMENT; |
| 291 | goto out; |
| 292 | #else /* WITH_OPENSSL */ |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 293 | type = (*cipher->evptype)(); |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 294 | if ((cc->evp = EVP_CIPHER_CTX_new()) == NULL) { |
| 295 | ret = SSH_ERR_ALLOC_FAIL; |
| 296 | goto out; |
| 297 | } |
| 298 | if (EVP_CipherInit(cc->evp, type, NULL, (u_char *)iv, |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 299 | (do_encrypt == CIPHER_ENCRYPT)) == 0) { |
| 300 | ret = SSH_ERR_LIBCRYPTO_ERROR; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 301 | goto out; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 302 | } |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 303 | if (cipher_authlen(cipher) && |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 304 | !EVP_CIPHER_CTX_ctrl(cc->evp, EVP_CTRL_GCM_SET_IV_FIXED, |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 305 | -1, (u_char *)iv)) { |
| 306 | ret = SSH_ERR_LIBCRYPTO_ERROR; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 307 | goto out; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 308 | } |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 309 | klen = EVP_CIPHER_CTX_key_length(cc->evp); |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 310 | if (klen > 0 && keylen != (u_int)klen) { |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 311 | if (EVP_CIPHER_CTX_set_key_length(cc->evp, keylen) == 0) { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 312 | ret = SSH_ERR_LIBCRYPTO_ERROR; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 313 | goto out; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 314 | } |
Damien Miller | 21cf4e0 | 2002-02-19 15:26:42 +1100 | [diff] [blame] | 315 | } |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 316 | if (EVP_CipherInit(cc->evp, NULL, (u_char *)key, NULL, -1) == 0) { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 317 | ret = SSH_ERR_LIBCRYPTO_ERROR; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 318 | goto out; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 319 | } |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 320 | ret = 0; |
| 321 | #endif /* WITH_OPENSSL */ |
| 322 | out: |
| 323 | if (ret == 0) { |
| 324 | /* success */ |
| 325 | *ccp = cc; |
| 326 | } else { |
| 327 | if (cc != NULL) { |
| 328 | #ifdef WITH_OPENSSL |
jsing@openbsd.org | 7cd3163 | 2018-02-07 02:06:50 +0000 | [diff] [blame] | 329 | EVP_CIPHER_CTX_free(cc->evp); |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 330 | #endif /* WITH_OPENSSL */ |
| 331 | explicit_bzero(cc, sizeof(*cc)); |
| 332 | free(cc); |
| 333 | } |
| 334 | } |
| 335 | return ret; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 336 | } |
| 337 | |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 338 | /* |
| 339 | * cipher_crypt() operates as following: |
| 340 | * Copy 'aadlen' bytes (without en/decryption) from 'src' to 'dest'. |
| 341 | * Theses bytes are treated as additional authenticated data for |
| 342 | * authenticated encryption modes. |
| 343 | * En/Decrypt 'len' bytes at offset 'aadlen' from 'src' to 'dest'. |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 344 | * Use 'authlen' bytes at offset 'len'+'aadlen' as the authentication tag. |
| 345 | * This tag is written on encryption and verified on decryption. |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 346 | * Both 'aadlen' and 'authlen' can be set to 0. |
| 347 | */ |
Damien Miller | bcd00ab | 2013-12-07 10:41:55 +1100 | [diff] [blame] | 348 | int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 349 | cipher_crypt(struct sshcipher_ctx *cc, u_int seqnr, u_char *dest, |
| 350 | const u_char *src, u_int len, u_int aadlen, u_int authlen) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 351 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 352 | if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) { |
| 353 | return chachapoly_crypt(&cc->cp_ctx, seqnr, dest, src, |
| 354 | len, aadlen, authlen, cc->encrypt); |
| 355 | } |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 356 | if ((cc->cipher->flags & CFLAG_NONE) != 0) { |
| 357 | memcpy(dest, src, aadlen + len); |
| 358 | return 0; |
| 359 | } |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 360 | #ifndef WITH_OPENSSL |
| 361 | if ((cc->cipher->flags & CFLAG_AESCTR) != 0) { |
| 362 | if (aadlen) |
| 363 | memcpy(dest, src, aadlen); |
| 364 | aesctr_encrypt_bytes(&cc->ac_ctx, src + aadlen, |
| 365 | dest + aadlen, len); |
| 366 | return 0; |
| 367 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 368 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 369 | #else |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 370 | if (authlen) { |
| 371 | u_char lastiv[1]; |
| 372 | |
| 373 | if (authlen != cipher_authlen(cc->cipher)) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 374 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 375 | /* increment IV */ |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 376 | if (!EVP_CIPHER_CTX_ctrl(cc->evp, EVP_CTRL_GCM_IV_GEN, |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 377 | 1, lastiv)) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 378 | return SSH_ERR_LIBCRYPTO_ERROR; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 379 | /* set tag on decyption */ |
| 380 | if (!cc->encrypt && |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 381 | !EVP_CIPHER_CTX_ctrl(cc->evp, EVP_CTRL_GCM_SET_TAG, |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 382 | authlen, (u_char *)src + aadlen + len)) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 383 | return SSH_ERR_LIBCRYPTO_ERROR; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 384 | } |
| 385 | if (aadlen) { |
| 386 | if (authlen && |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 387 | EVP_Cipher(cc->evp, NULL, (u_char *)src, aadlen) < 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 388 | return SSH_ERR_LIBCRYPTO_ERROR; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 389 | memcpy(dest, src, aadlen); |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 390 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 391 | if (len % cc->cipher->block_size) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 392 | return SSH_ERR_INVALID_ARGUMENT; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 393 | if (EVP_Cipher(cc->evp, dest + aadlen, (u_char *)src + aadlen, |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 394 | len) < 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 395 | return SSH_ERR_LIBCRYPTO_ERROR; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 396 | if (authlen) { |
| 397 | /* compute tag (on encrypt) or verify tag (on decrypt) */ |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 398 | if (EVP_Cipher(cc->evp, NULL, NULL, 0) < 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 399 | return cc->encrypt ? |
| 400 | SSH_ERR_LIBCRYPTO_ERROR : SSH_ERR_MAC_INVALID; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 401 | if (cc->encrypt && |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 402 | !EVP_CIPHER_CTX_ctrl(cc->evp, EVP_CTRL_GCM_GET_TAG, |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 403 | authlen, dest + aadlen + len)) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 404 | return SSH_ERR_LIBCRYPTO_ERROR; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 405 | } |
Damien Miller | bcd00ab | 2013-12-07 10:41:55 +1100 | [diff] [blame] | 406 | return 0; |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 407 | #endif |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 408 | } |
| 409 | |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 410 | /* Extract the packet length, including any decryption necessary beforehand */ |
| 411 | int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 412 | cipher_get_length(struct sshcipher_ctx *cc, u_int *plenp, u_int seqnr, |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 413 | const u_char *cp, u_int len) |
| 414 | { |
| 415 | if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) |
| 416 | return chachapoly_get_length(&cc->cp_ctx, plenp, seqnr, |
| 417 | cp, len); |
| 418 | if (len < 4) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 419 | return SSH_ERR_MESSAGE_INCOMPLETE; |
markus@openbsd.org | 1b11ea7 | 2018-02-23 15:58:37 +0000 | [diff] [blame] | 420 | *plenp = PEEK_U32(cp); |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 421 | return 0; |
| 422 | } |
| 423 | |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 424 | void |
| 425 | cipher_free(struct sshcipher_ctx *cc) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 426 | { |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 427 | if (cc == NULL) |
| 428 | return; |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 429 | if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) |
Damien Miller | a5103f4 | 2014-02-04 11:20:14 +1100 | [diff] [blame] | 430 | explicit_bzero(&cc->cp_ctx, sizeof(cc->cp_ctx)); |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 431 | else if ((cc->cipher->flags & CFLAG_AESCTR) != 0) |
| 432 | explicit_bzero(&cc->ac_ctx, sizeof(cc->ac_ctx)); |
| 433 | #ifdef WITH_OPENSSL |
jsing@openbsd.org | 7cd3163 | 2018-02-07 02:06:50 +0000 | [diff] [blame] | 434 | EVP_CIPHER_CTX_free(cc->evp); |
| 435 | cc->evp = NULL; |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 436 | #endif |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 437 | explicit_bzero(cc, sizeof(*cc)); |
| 438 | free(cc); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 439 | } |
| 440 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 441 | /* |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 442 | * Exports an IV from the sshcipher_ctx required to export the key |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 443 | * state back from the unprivileged child to the privileged parent |
| 444 | * process. |
| 445 | */ |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 446 | int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 447 | cipher_get_keyiv_len(const struct sshcipher_ctx *cc) |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 448 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 449 | const struct sshcipher *c = cc->cipher; |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 450 | |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 451 | if ((c->flags & CFLAG_CHACHAPOLY) != 0) |
| 452 | return 0; |
| 453 | else if ((c->flags & CFLAG_AESCTR) != 0) |
| 454 | return sizeof(cc->ac_ctx.ctr); |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 455 | #ifdef WITH_OPENSSL |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 456 | return EVP_CIPHER_CTX_iv_length(cc->evp); |
| 457 | #else |
| 458 | return 0; |
| 459 | #endif |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 460 | } |
| 461 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 462 | int |
djm@openbsd.org | 482d23b | 2018-09-13 02:08:33 +0000 | [diff] [blame] | 463 | cipher_get_keyiv(struct sshcipher_ctx *cc, u_char *iv, size_t len) |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 464 | { |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 465 | #ifdef WITH_OPENSSL |
djm@openbsd.org@openbsd.org | 41bff4d | 2017-11-03 02:22:41 +0000 | [diff] [blame] | 466 | const struct sshcipher *c = cc->cipher; |
djm@openbsd.org | b8bbff3 | 2018-02-13 03:36:56 +0000 | [diff] [blame] | 467 | int evplen; |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 468 | #endif |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 469 | |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 470 | if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) { |
| 471 | if (len != 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 472 | return SSH_ERR_INVALID_ARGUMENT; |
| 473 | return 0; |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 474 | } |
djm@openbsd.org | 540e891 | 2015-01-14 10:29:45 +0000 | [diff] [blame] | 475 | if ((cc->cipher->flags & CFLAG_AESCTR) != 0) { |
| 476 | if (len != sizeof(cc->ac_ctx.ctr)) |
| 477 | return SSH_ERR_INVALID_ARGUMENT; |
| 478 | memcpy(iv, cc->ac_ctx.ctr, len); |
| 479 | return 0; |
| 480 | } |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 481 | if ((cc->cipher->flags & CFLAG_NONE) != 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 482 | return 0; |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 483 | |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 484 | #ifdef WITH_OPENSSL |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 485 | evplen = EVP_CIPHER_CTX_iv_length(cc->evp); |
| 486 | if (evplen == 0) |
| 487 | return 0; |
| 488 | else if (evplen < 0) |
| 489 | return SSH_ERR_LIBCRYPTO_ERROR; |
djm@openbsd.org | 482d23b | 2018-09-13 02:08:33 +0000 | [diff] [blame] | 490 | if ((size_t)evplen != len) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 491 | return SSH_ERR_INVALID_ARGUMENT; |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 492 | #ifndef OPENSSL_HAVE_EVPCTR |
| 493 | if (c->evptype == evp_aes_128_ctr) |
| 494 | ssh_aes_ctr_iv(cc->evp, 0, iv, len); |
| 495 | else |
| 496 | #endif |
| 497 | if (cipher_authlen(c)) { |
| 498 | if (!EVP_CIPHER_CTX_ctrl(cc->evp, EVP_CTRL_GCM_IV_GEN, |
| 499 | len, iv)) |
| 500 | return SSH_ERR_LIBCRYPTO_ERROR; |
djm@openbsd.org | 482d23b | 2018-09-13 02:08:33 +0000 | [diff] [blame] | 501 | } else if (!EVP_CIPHER_CTX_get_iv(cc->evp, iv, len)) |
| 502 | return SSH_ERR_LIBCRYPTO_ERROR; |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 503 | #endif |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 504 | return 0; |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 505 | } |
| 506 | |
Ben Lindstrom | 212faca | 2002-03-22 01:39:44 +0000 | [diff] [blame] | 507 | int |
djm@openbsd.org | 482d23b | 2018-09-13 02:08:33 +0000 | [diff] [blame] | 508 | cipher_set_keyiv(struct sshcipher_ctx *cc, const u_char *iv, size_t len) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 509 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 510 | #ifdef WITH_OPENSSL |
djm@openbsd.org@openbsd.org | 41bff4d | 2017-11-03 02:22:41 +0000 | [diff] [blame] | 511 | const struct sshcipher *c = cc->cipher; |
djm@openbsd.org | b8bbff3 | 2018-02-13 03:36:56 +0000 | [diff] [blame] | 512 | int evplen = 0; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 513 | #endif |
| 514 | |
| 515 | if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) |
| 516 | return 0; |
| 517 | if ((cc->cipher->flags & CFLAG_NONE) != 0) |
| 518 | return 0; |
| 519 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 520 | #ifdef WITH_OPENSSL |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 521 | evplen = EVP_CIPHER_CTX_iv_length(cc->evp); |
| 522 | if (evplen <= 0) |
| 523 | return SSH_ERR_LIBCRYPTO_ERROR; |
djm@openbsd.org | 482d23b | 2018-09-13 02:08:33 +0000 | [diff] [blame] | 524 | if ((size_t)evplen != len) |
| 525 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | 315d2a4 | 2016-10-28 14:34:07 +1100 | [diff] [blame] | 526 | #ifndef OPENSSL_HAVE_EVPCTR |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 527 | /* XXX iv arg is const, but ssh_aes_ctr_iv isn't */ |
| 528 | if (c->evptype == evp_aes_128_ctr) |
| 529 | ssh_aes_ctr_iv(cc->evp, 1, (u_char *)iv, evplen); |
| 530 | else |
Damien Miller | 315d2a4 | 2016-10-28 14:34:07 +1100 | [diff] [blame] | 531 | #endif |
djm@openbsd.org | cdccebd | 2017-04-30 23:15:04 +0000 | [diff] [blame] | 532 | if (cipher_authlen(c)) { |
| 533 | /* XXX iv arg is const, but EVP_CIPHER_CTX_ctrl isn't */ |
| 534 | if (!EVP_CIPHER_CTX_ctrl(cc->evp, |
| 535 | EVP_CTRL_GCM_SET_IV_FIXED, -1, (void *)iv)) |
| 536 | return SSH_ERR_LIBCRYPTO_ERROR; |
djm@openbsd.org | 482d23b | 2018-09-13 02:08:33 +0000 | [diff] [blame] | 537 | } else if (!EVP_CIPHER_CTX_set_iv(cc->evp, iv, evplen)) |
| 538 | return SSH_ERR_LIBCRYPTO_ERROR; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 539 | #endif |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 540 | return 0; |
| 541 | } |