djm@openbsd.org | be02d7c | 2019-09-06 04:53:27 +0000 | [diff] [blame] | 1 | /* $OpenBSD: mac.c,v 1.35 2019/09/06 04:53:27 djm Exp $ */ |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2001 Markus Friedl. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 24 | */ |
| 25 | |
| 26 | #include "includes.h" |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 27 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 28 | #include <sys/types.h> |
| 29 | |
Darren Tucker | 2ea6031 | 2019-07-23 22:11:50 +1000 | [diff] [blame] | 30 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 31 | #include <string.h> |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 32 | #include <stdio.h> |
djm@openbsd.org | be02d7c | 2019-09-06 04:53:27 +0000 | [diff] [blame] | 33 | #include <stdlib.h> |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 34 | |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 35 | #include "digest.h" |
| 36 | #include "hmac.h" |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 37 | #include "umac.h" |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 38 | #include "mac.h" |
| 39 | #include "misc.h" |
| 40 | #include "ssherr.h" |
| 41 | #include "sshbuf.h" |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 42 | |
Darren Tucker | e9b3ad7 | 2012-01-17 14:03:34 +1100 | [diff] [blame] | 43 | #include "openbsd-compat/openssl-compat.h" |
| 44 | |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 45 | #define SSH_DIGEST 1 /* SSH_DIGEST_XXX */ |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 46 | #define SSH_UMAC 2 /* UMAC (not integrated with OpenSSL) */ |
Darren Tucker | 427e409 | 2012-10-05 11:02:39 +1000 | [diff] [blame] | 47 | #define SSH_UMAC128 3 |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 48 | |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 49 | struct macalg { |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 50 | char *name; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 51 | int type; |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 52 | int alg; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 53 | int truncatebits; /* truncate digest if != 0 */ |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 54 | int key_len; /* just for UMAC */ |
| 55 | int len; /* just for UMAC */ |
Damien Miller | 37834af | 2012-12-12 11:00:37 +1100 | [diff] [blame] | 56 | int etm; /* Encrypt-then-MAC */ |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 57 | }; |
| 58 | |
| 59 | static const struct macalg macs[] = { |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 60 | /* Encrypt-and-MAC (encrypt-and-authenticate) variants */ |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 61 | { "hmac-sha1", SSH_DIGEST, SSH_DIGEST_SHA1, 0, 0, 0, 0 }, |
| 62 | { "hmac-sha1-96", SSH_DIGEST, SSH_DIGEST_SHA1, 96, 0, 0, 0 }, |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 63 | { "hmac-sha2-256", SSH_DIGEST, SSH_DIGEST_SHA256, 0, 0, 0, 0 }, |
| 64 | { "hmac-sha2-512", SSH_DIGEST, SSH_DIGEST_SHA512, 0, 0, 0, 0 }, |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 65 | { "hmac-md5", SSH_DIGEST, SSH_DIGEST_MD5, 0, 0, 0, 0 }, |
| 66 | { "hmac-md5-96", SSH_DIGEST, SSH_DIGEST_MD5, 96, 0, 0, 0 }, |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 67 | { "umac-64@openssh.com", SSH_UMAC, 0, 0, 128, 64, 0 }, |
| 68 | { "umac-128@openssh.com", SSH_UMAC128, 0, 0, 128, 128, 0 }, |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 69 | |
| 70 | /* Encrypt-then-MAC variants */ |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 71 | { "hmac-sha1-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_SHA1, 0, 0, 0, 1 }, |
| 72 | { "hmac-sha1-96-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_SHA1, 96, 0, 0, 1 }, |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 73 | { "hmac-sha2-256-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_SHA256, 0, 0, 0, 1 }, |
| 74 | { "hmac-sha2-512-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_SHA512, 0, 0, 0, 1 }, |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 75 | { "hmac-md5-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_MD5, 0, 0, 0, 1 }, |
| 76 | { "hmac-md5-96-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_MD5, 96, 0, 0, 1 }, |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 77 | { "umac-64-etm@openssh.com", SSH_UMAC, 0, 0, 128, 64, 1 }, |
| 78 | { "umac-128-etm@openssh.com", SSH_UMAC128, 0, 0, 128, 128, 1 }, |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 79 | |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 80 | { NULL, 0, 0, 0, 0, 0, 0 } |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 81 | }; |
| 82 | |
Damien Miller | 690d989 | 2013-11-08 12:16:49 +1100 | [diff] [blame] | 83 | /* Returns a list of supported MACs separated by the specified char. */ |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 84 | char * |
Damien Miller | 690d989 | 2013-11-08 12:16:49 +1100 | [diff] [blame] | 85 | mac_alg_list(char sep) |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 86 | { |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 87 | char *ret = NULL, *tmp; |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 88 | size_t nlen, rlen = 0; |
| 89 | const struct macalg *m; |
| 90 | |
| 91 | for (m = macs; m->name != NULL; m++) { |
| 92 | if (ret != NULL) |
Damien Miller | 690d989 | 2013-11-08 12:16:49 +1100 | [diff] [blame] | 93 | ret[rlen++] = sep; |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 94 | nlen = strlen(m->name); |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 95 | if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) { |
| 96 | free(ret); |
| 97 | return NULL; |
| 98 | } |
| 99 | ret = tmp; |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 100 | memcpy(ret + rlen, m->name, nlen + 1); |
| 101 | rlen += nlen; |
| 102 | } |
| 103 | return ret; |
| 104 | } |
| 105 | |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 106 | static int |
| 107 | mac_setup_by_alg(struct sshmac *mac, const struct macalg *macalg) |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 108 | { |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 109 | mac->type = macalg->type; |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 110 | if (mac->type == SSH_DIGEST) { |
| 111 | if ((mac->hmac_ctx = ssh_hmac_start(macalg->alg)) == NULL) |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 112 | return SSH_ERR_ALLOC_FAIL; |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 113 | mac->key_len = mac->mac_len = ssh_hmac_bytes(macalg->alg); |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 114 | } else { |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 115 | mac->mac_len = macalg->len / 8; |
| 116 | mac->key_len = macalg->key_len / 8; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 117 | mac->umac_ctx = NULL; |
| 118 | } |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 119 | if (macalg->truncatebits != 0) |
| 120 | mac->mac_len = macalg->truncatebits / 8; |
| 121 | mac->etm = macalg->etm; |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 122 | return 0; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 123 | } |
| 124 | |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 125 | int |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 126 | mac_setup(struct sshmac *mac, char *name) |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 127 | { |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 128 | const struct macalg *m; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 129 | |
Damien Miller | ea11119 | 2013-04-23 19:24:32 +1000 | [diff] [blame] | 130 | for (m = macs; m->name != NULL; m++) { |
| 131 | if (strcmp(name, m->name) != 0) |
| 132 | continue; |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 133 | if (mac != NULL) |
| 134 | return mac_setup_by_alg(mac, m); |
| 135 | return 0; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 136 | } |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 137 | return SSH_ERR_INVALID_ARGUMENT; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 138 | } |
| 139 | |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 140 | int |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 141 | mac_init(struct sshmac *mac) |
Darren Tucker | 5f3d5be | 2007-06-05 18:30:18 +1000 | [diff] [blame] | 142 | { |
| 143 | if (mac->key == NULL) |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 144 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 145 | switch (mac->type) { |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 146 | case SSH_DIGEST: |
| 147 | if (mac->hmac_ctx == NULL || |
| 148 | ssh_hmac_init(mac->hmac_ctx, mac->key, mac->key_len) < 0) |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 149 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 150 | return 0; |
| 151 | case SSH_UMAC: |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 152 | if ((mac->umac_ctx = umac_new(mac->key)) == NULL) |
| 153 | return SSH_ERR_ALLOC_FAIL; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 154 | return 0; |
Darren Tucker | 427e409 | 2012-10-05 11:02:39 +1000 | [diff] [blame] | 155 | case SSH_UMAC128: |
naddy@openbsd.org | ddef999 | 2015-01-15 18:32:54 +0000 | [diff] [blame] | 156 | if ((mac->umac_ctx = umac128_new(mac->key)) == NULL) |
| 157 | return SSH_ERR_ALLOC_FAIL; |
Darren Tucker | 427e409 | 2012-10-05 11:02:39 +1000 | [diff] [blame] | 158 | return 0; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 159 | default: |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 160 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 161 | } |
Darren Tucker | 5f3d5be | 2007-06-05 18:30:18 +1000 | [diff] [blame] | 162 | } |
| 163 | |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 164 | int |
djm@openbsd.org | 6d31193 | 2016-07-08 03:44:42 +0000 | [diff] [blame] | 165 | mac_compute(struct sshmac *mac, u_int32_t seqno, |
| 166 | const u_char *data, int datalen, |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 167 | u_char *digest, size_t dlen) |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 168 | { |
Darren Tucker | 4ac66af | 2013-06-06 08:12:37 +1000 | [diff] [blame] | 169 | static union { |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 170 | u_char m[SSH_DIGEST_MAX_LENGTH]; |
Darren Tucker | 4ac66af | 2013-06-06 08:12:37 +1000 | [diff] [blame] | 171 | u_int64_t for_align; |
| 172 | } u; |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 173 | u_char b[4]; |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 174 | u_char nonce[8]; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 175 | |
Darren Tucker | 4ac66af | 2013-06-06 08:12:37 +1000 | [diff] [blame] | 176 | if (mac->mac_len > sizeof(u)) |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 177 | return SSH_ERR_INTERNAL_ERROR; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 178 | |
| 179 | switch (mac->type) { |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 180 | case SSH_DIGEST: |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 181 | put_u32(b, seqno); |
| 182 | /* reset HMAC context */ |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 183 | if (ssh_hmac_init(mac->hmac_ctx, NULL, 0) < 0 || |
| 184 | ssh_hmac_update(mac->hmac_ctx, b, sizeof(b)) < 0 || |
| 185 | ssh_hmac_update(mac->hmac_ctx, data, datalen) < 0 || |
| 186 | ssh_hmac_final(mac->hmac_ctx, u.m, sizeof(u.m)) < 0) |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 187 | return SSH_ERR_LIBCRYPTO_ERROR; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 188 | break; |
| 189 | case SSH_UMAC: |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 190 | POKE_U64(nonce, seqno); |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 191 | umac_update(mac->umac_ctx, data, datalen); |
Darren Tucker | 4ac66af | 2013-06-06 08:12:37 +1000 | [diff] [blame] | 192 | umac_final(mac->umac_ctx, u.m, nonce); |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 193 | break; |
Darren Tucker | 427e409 | 2012-10-05 11:02:39 +1000 | [diff] [blame] | 194 | case SSH_UMAC128: |
| 195 | put_u64(nonce, seqno); |
| 196 | umac128_update(mac->umac_ctx, data, datalen); |
Darren Tucker | 4ac66af | 2013-06-06 08:12:37 +1000 | [diff] [blame] | 197 | umac128_final(mac->umac_ctx, u.m, nonce); |
Darren Tucker | 427e409 | 2012-10-05 11:02:39 +1000 | [diff] [blame] | 198 | break; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 199 | default: |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 200 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 201 | } |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 202 | if (digest != NULL) { |
| 203 | if (dlen > mac->mac_len) |
| 204 | dlen = mac->mac_len; |
| 205 | memcpy(digest, u.m, dlen); |
| 206 | } |
| 207 | return 0; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 208 | } |
| 209 | |
djm@openbsd.org | 6d31193 | 2016-07-08 03:44:42 +0000 | [diff] [blame] | 210 | int |
| 211 | mac_check(struct sshmac *mac, u_int32_t seqno, |
| 212 | const u_char *data, size_t dlen, |
| 213 | const u_char *theirmac, size_t mlen) |
| 214 | { |
| 215 | u_char ourmac[SSH_DIGEST_MAX_LENGTH]; |
| 216 | int r; |
| 217 | |
| 218 | if (mac->mac_len > mlen) |
| 219 | return SSH_ERR_INVALID_ARGUMENT; |
| 220 | if ((r = mac_compute(mac, seqno, data, dlen, |
| 221 | ourmac, sizeof(ourmac))) != 0) |
| 222 | return r; |
| 223 | if (timingsafe_bcmp(ourmac, theirmac, mac->mac_len) != 0) |
| 224 | return SSH_ERR_MAC_INVALID; |
| 225 | return 0; |
| 226 | } |
| 227 | |
Darren Tucker | 5f3d5be | 2007-06-05 18:30:18 +1000 | [diff] [blame] | 228 | void |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 229 | mac_clear(struct sshmac *mac) |
Darren Tucker | 5f3d5be | 2007-06-05 18:30:18 +1000 | [diff] [blame] | 230 | { |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 231 | if (mac->type == SSH_UMAC) { |
| 232 | if (mac->umac_ctx != NULL) |
| 233 | umac_delete(mac->umac_ctx); |
Darren Tucker | 427e409 | 2012-10-05 11:02:39 +1000 | [diff] [blame] | 234 | } else if (mac->type == SSH_UMAC128) { |
| 235 | if (mac->umac_ctx != NULL) |
| 236 | umac128_delete(mac->umac_ctx); |
Damien Miller | 4e8d937 | 2014-02-04 11:02:42 +1100 | [diff] [blame] | 237 | } else if (mac->hmac_ctx != NULL) |
| 238 | ssh_hmac_free(mac->hmac_ctx); |
| 239 | mac->hmac_ctx = NULL; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 240 | mac->umac_ctx = NULL; |
Darren Tucker | 5f3d5be | 2007-06-05 18:30:18 +1000 | [diff] [blame] | 241 | } |
| 242 | |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 243 | /* XXX copied from ciphers_valid */ |
| 244 | #define MAC_SEP "," |
| 245 | int |
| 246 | mac_valid(const char *names) |
| 247 | { |
| 248 | char *maclist, *cp, *p; |
| 249 | |
| 250 | if (names == NULL || strcmp(names, "") == 0) |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 251 | return 0; |
| 252 | if ((maclist = cp = strdup(names)) == NULL) |
| 253 | return 0; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 254 | for ((p = strsep(&cp, MAC_SEP)); p && *p != '\0'; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 255 | (p = strsep(&cp, MAC_SEP))) { |
Darren Tucker | 5f3d5be | 2007-06-05 18:30:18 +1000 | [diff] [blame] | 256 | if (mac_setup(NULL, p) < 0) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 257 | free(maclist); |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 258 | return 0; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 259 | } |
| 260 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 261 | free(maclist); |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 262 | return 1; |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 263 | } |