markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 1 | /* $OpenBSD: dh.c,v 1.64 2018/06/06 18:29:18 markus Exp $ */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2000 Niels Provos. 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" |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 27 | |
Marcus Folkesson | 6b373e4 | 2017-10-28 19:48:39 +0200 | [diff] [blame] | 28 | #ifdef WITH_OPENSSL |
Damien Miller | 8dbffe7 | 2006-08-05 11:02:17 +1000 | [diff] [blame] | 29 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 30 | #include <openssl/bn.h> |
| 31 | #include <openssl/dh.h> |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 32 | |
dtucker@openbsd.org | fdfbf45 | 2016-03-31 05:24:06 +0000 | [diff] [blame] | 33 | #include <errno.h> |
Damien Miller | ded319c | 2006-09-01 15:38:36 +1000 | [diff] [blame] | 34 | #include <stdarg.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 35 | #include <stdio.h> |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 36 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 37 | #include <string.h> |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 38 | #include <limits.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 39 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 40 | #include "dh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 41 | #include "pathnames.h" |
| 42 | #include "log.h" |
| 43 | #include "misc.h" |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 44 | #include "ssherr.h" |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 45 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 46 | static int |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 47 | parse_prime(int linenum, char *line, struct dhgroup *dhg) |
| 48 | { |
| 49 | char *cp, *arg; |
| 50 | char *strsize, *gen, *prime; |
Damien Miller | 5a73c1a | 2006-03-31 23:09:41 +1100 | [diff] [blame] | 51 | const char *errstr = NULL; |
Damien Miller | 2e9cf49 | 2008-06-29 22:47:04 +1000 | [diff] [blame] | 52 | long long n; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 53 | |
Damien Miller | 0d02c3e | 2013-07-18 16:12:06 +1000 | [diff] [blame] | 54 | dhg->p = dhg->g = NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 55 | cp = line; |
Damien Miller | 928b236 | 2006-03-26 13:53:32 +1100 | [diff] [blame] | 56 | if ((arg = strdelim(&cp)) == NULL) |
| 57 | return 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 58 | /* Ignore leading whitespace */ |
| 59 | if (*arg == '\0') |
| 60 | arg = strdelim(&cp); |
Ben Lindstrom | 04f9af7 | 2002-07-04 00:03:56 +0000 | [diff] [blame] | 61 | if (!arg || !*arg || *arg == '#') |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 62 | return 0; |
| 63 | |
| 64 | /* time */ |
| 65 | if (cp == NULL || *arg == '\0') |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 66 | goto truncated; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 67 | arg = strsep(&cp, " "); /* type */ |
| 68 | if (cp == NULL || *arg == '\0') |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 69 | goto truncated; |
Damien Miller | 2e9cf49 | 2008-06-29 22:47:04 +1000 | [diff] [blame] | 70 | /* Ensure this is a safe prime */ |
| 71 | n = strtonum(arg, 0, 5, &errstr); |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 72 | if (errstr != NULL || n != MODULI_TYPE_SAFE) { |
| 73 | error("moduli:%d: type is not %d", linenum, MODULI_TYPE_SAFE); |
Damien Miller | 2e9cf49 | 2008-06-29 22:47:04 +1000 | [diff] [blame] | 74 | goto fail; |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 75 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 76 | arg = strsep(&cp, " "); /* tests */ |
| 77 | if (cp == NULL || *arg == '\0') |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 78 | goto truncated; |
Damien Miller | 2e9cf49 | 2008-06-29 22:47:04 +1000 | [diff] [blame] | 79 | /* Ensure prime has been tested and is not composite */ |
| 80 | n = strtonum(arg, 0, 0x1f, &errstr); |
| 81 | if (errstr != NULL || |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 82 | (n & MODULI_TESTS_COMPOSITE) || !(n & ~MODULI_TESTS_COMPOSITE)) { |
| 83 | error("moduli:%d: invalid moduli tests flag", linenum); |
Damien Miller | 2e9cf49 | 2008-06-29 22:47:04 +1000 | [diff] [blame] | 84 | goto fail; |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 85 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 86 | arg = strsep(&cp, " "); /* tries */ |
| 87 | if (cp == NULL || *arg == '\0') |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 88 | goto truncated; |
Damien Miller | 2e9cf49 | 2008-06-29 22:47:04 +1000 | [diff] [blame] | 89 | n = strtonum(arg, 0, 1<<30, &errstr); |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 90 | if (errstr != NULL || n == 0) { |
| 91 | error("moduli:%d: invalid primality trial count", linenum); |
Damien Miller | 2e9cf49 | 2008-06-29 22:47:04 +1000 | [diff] [blame] | 92 | goto fail; |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 93 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 94 | strsize = strsep(&cp, " "); /* size */ |
| 95 | if (cp == NULL || *strsize == '\0' || |
Darren Tucker | 759cb2a | 2009-10-07 09:01:50 +1100 | [diff] [blame] | 96 | (dhg->size = (int)strtonum(strsize, 0, 64*1024, &errstr)) == 0 || |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 97 | errstr) { |
| 98 | error("moduli:%d: invalid prime length", linenum); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 99 | goto fail; |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 100 | } |
Ben Lindstrom | df22139 | 2001-03-29 00:36:16 +0000 | [diff] [blame] | 101 | /* The whole group is one bit larger */ |
| 102 | dhg->size++; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 103 | gen = strsep(&cp, " "); /* gen */ |
| 104 | if (cp == NULL || *gen == '\0') |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 105 | goto truncated; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 106 | prime = strsep(&cp, " "); /* prime */ |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 107 | if (cp != NULL || *prime == '\0') { |
| 108 | truncated: |
| 109 | error("moduli:%d: truncated", linenum); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 110 | goto fail; |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 111 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 112 | |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 113 | if ((dhg->g = BN_new()) == NULL || |
| 114 | (dhg->p = BN_new()) == NULL) { |
| 115 | error("parse_prime: BN_new failed"); |
| 116 | goto fail; |
| 117 | } |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 118 | if (BN_hex2bn(&dhg->g, gen) == 0) { |
| 119 | error("moduli:%d: could not parse generator value", linenum); |
| 120 | goto fail; |
| 121 | } |
| 122 | if (BN_hex2bn(&dhg->p, prime) == 0) { |
| 123 | error("moduli:%d: could not parse prime value", linenum); |
| 124 | goto fail; |
| 125 | } |
| 126 | if (BN_num_bits(dhg->p) != dhg->size) { |
| 127 | error("moduli:%d: prime has wrong size: actual %d listed %d", |
| 128 | linenum, BN_num_bits(dhg->p), dhg->size - 1); |
| 129 | goto fail; |
| 130 | } |
| 131 | if (BN_cmp(dhg->g, BN_value_one()) <= 0) { |
| 132 | error("moduli:%d: generator is invalid", linenum); |
| 133 | goto fail; |
| 134 | } |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 135 | return 1; |
Damien Miller | 23e526e | 2001-03-30 10:47:43 +1000 | [diff] [blame] | 136 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 137 | fail: |
jsing@openbsd.org | 7cd3163 | 2018-02-07 02:06:50 +0000 | [diff] [blame] | 138 | BN_clear_free(dhg->g); |
| 139 | BN_clear_free(dhg->p); |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 140 | dhg->g = dhg->p = NULL; |
Damien Miller | bbeb1da | 2013-07-18 16:10:49 +1000 | [diff] [blame] | 141 | return 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 142 | } |
| 143 | |
| 144 | DH * |
Ben Lindstrom | df22139 | 2001-03-29 00:36:16 +0000 | [diff] [blame] | 145 | choose_dh(int min, int wantbits, int max) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 146 | { |
| 147 | FILE *f; |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 148 | char *line = NULL; |
| 149 | size_t linesize = 0; |
| 150 | int best, bestcount, which, linenum; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 151 | struct dhgroup dhg; |
| 152 | |
dtucker@openbsd.org | fdfbf45 | 2016-03-31 05:24:06 +0000 | [diff] [blame] | 153 | if ((f = fopen(_PATH_DH_MODULI, "r")) == NULL) { |
dtucker@openbsd.org | dcc7d74 | 2016-12-15 21:20:41 +0000 | [diff] [blame] | 154 | logit("WARNING: could not open %s (%s), using fixed modulus", |
dtucker@openbsd.org | fdfbf45 | 2016-03-31 05:24:06 +0000 | [diff] [blame] | 155 | _PATH_DH_MODULI, strerror(errno)); |
dtucker@openbsd.org | 40f6429 | 2015-05-27 23:39:18 +0000 | [diff] [blame] | 156 | return (dh_new_group_fallback(max)); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | linenum = 0; |
| 160 | best = bestcount = 0; |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 161 | while (getline(&line, &linesize, f) != -1) { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 162 | linenum++; |
| 163 | if (!parse_prime(linenum, line, &dhg)) |
| 164 | continue; |
Damien Miller | 9ef95dd | 2002-01-22 23:10:33 +1100 | [diff] [blame] | 165 | BN_clear_free(dhg.g); |
| 166 | BN_clear_free(dhg.p); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 167 | |
Ben Lindstrom | df22139 | 2001-03-29 00:36:16 +0000 | [diff] [blame] | 168 | if (dhg.size > max || dhg.size < min) |
| 169 | continue; |
| 170 | |
| 171 | if ((dhg.size > wantbits && dhg.size < best) || |
| 172 | (dhg.size > best && best < wantbits)) { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 173 | best = dhg.size; |
| 174 | bestcount = 0; |
| 175 | } |
| 176 | if (dhg.size == best) |
| 177 | bestcount++; |
| 178 | } |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 179 | free(line); |
| 180 | line = NULL; |
| 181 | linesize = 0; |
Ben Lindstrom | af73880 | 2001-06-25 04:18:59 +0000 | [diff] [blame] | 182 | rewind(f); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 183 | |
| 184 | if (bestcount == 0) { |
Ben Lindstrom | af73880 | 2001-06-25 04:18:59 +0000 | [diff] [blame] | 185 | fclose(f); |
dtucker@openbsd.org | fdfbf45 | 2016-03-31 05:24:06 +0000 | [diff] [blame] | 186 | logit("WARNING: no suitable primes in %s", _PATH_DH_MODULI); |
dtucker@openbsd.org | 40f6429 | 2015-05-27 23:39:18 +0000 | [diff] [blame] | 187 | return (dh_new_group_fallback(max)); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 188 | } |
| 189 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 190 | linenum = 0; |
Damien Miller | 354c48c | 2008-05-19 14:50:00 +1000 | [diff] [blame] | 191 | which = arc4random_uniform(bestcount); |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 192 | while (getline(&line, &linesize, f) != -1) { |
| 193 | linenum++; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 194 | if (!parse_prime(linenum, line, &dhg)) |
| 195 | continue; |
Ben Lindstrom | 5ba23b3 | 2001-04-05 02:05:21 +0000 | [diff] [blame] | 196 | if ((dhg.size > max || dhg.size < min) || |
| 197 | dhg.size != best || |
| 198 | linenum++ != which) { |
Damien Miller | 9ef95dd | 2002-01-22 23:10:33 +1100 | [diff] [blame] | 199 | BN_clear_free(dhg.g); |
| 200 | BN_clear_free(dhg.p); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 201 | continue; |
| 202 | } |
| 203 | break; |
| 204 | } |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 205 | free(line); |
| 206 | line = NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 207 | fclose(f); |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 208 | if (linenum != which+1) { |
| 209 | logit("WARNING: line %d disappeared in %s, giving up", |
dtucker@openbsd.org | fdfbf45 | 2016-03-31 05:24:06 +0000 | [diff] [blame] | 210 | which, _PATH_DH_MODULI); |
dtucker@openbsd.org | 40f6429 | 2015-05-27 23:39:18 +0000 | [diff] [blame] | 211 | return (dh_new_group_fallback(max)); |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 212 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 213 | |
| 214 | return (dh_new_group(dhg.g, dhg.p)); |
| 215 | } |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 216 | |
Damien Miller | f675fc4 | 2004-06-15 10:30:09 +1000 | [diff] [blame] | 217 | /* diffie-hellman-groupN-sha1 */ |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 218 | |
| 219 | int |
| 220 | dh_pub_is_valid(DH *dh, BIGNUM *dh_pub) |
| 221 | { |
| 222 | int i; |
| 223 | int n = BN_num_bits(dh_pub); |
| 224 | int bits_set = 0; |
Darren Tucker | 31cde68 | 2006-05-06 17:43:33 +1000 | [diff] [blame] | 225 | BIGNUM *tmp; |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 226 | |
| 227 | if (dh_pub->neg) { |
Damien Miller | 603077a | 2007-10-26 14:25:55 +1000 | [diff] [blame] | 228 | logit("invalid public DH value: negative"); |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 229 | return 0; |
| 230 | } |
Darren Tucker | 31cde68 | 2006-05-06 17:43:33 +1000 | [diff] [blame] | 231 | if (BN_cmp(dh_pub, BN_value_one()) != 1) { /* pub_exp <= 1 */ |
| 232 | logit("invalid public DH value: <= 1"); |
| 233 | return 0; |
| 234 | } |
| 235 | |
Damien Miller | 603077a | 2007-10-26 14:25:55 +1000 | [diff] [blame] | 236 | if ((tmp = BN_new()) == NULL) { |
| 237 | error("%s: BN_new failed", __func__); |
| 238 | return 0; |
| 239 | } |
Darren Tucker | 31cde68 | 2006-05-06 17:43:33 +1000 | [diff] [blame] | 240 | if (!BN_sub(tmp, dh->p, BN_value_one()) || |
| 241 | BN_cmp(dh_pub, tmp) != -1) { /* pub_exp > p-2 */ |
| 242 | BN_clear_free(tmp); |
| 243 | logit("invalid public DH value: >= p-1"); |
| 244 | return 0; |
| 245 | } |
| 246 | BN_clear_free(tmp); |
| 247 | |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 248 | for (i = 0; i <= n; i++) |
| 249 | if (BN_is_bit_set(dh_pub, i)) |
| 250 | bits_set++; |
Ben Lindstrom | 1f53083 | 2002-12-23 02:03:02 +0000 | [diff] [blame] | 251 | debug2("bits set: %d/%d", bits_set, BN_num_bits(dh->p)); |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 252 | |
djm@openbsd.org | 6e7f68c | 2016-02-28 22:27:00 +0000 | [diff] [blame] | 253 | /* |
| 254 | * if g==2 and bits_set==1 then computing log_g(dh_pub) is trivial |
| 255 | */ |
| 256 | if (bits_set < 4) { |
| 257 | logit("invalid public DH value (%d/%d)", |
| 258 | bits_set, BN_num_bits(dh->p)); |
| 259 | return 0; |
| 260 | } |
| 261 | return 1; |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 262 | } |
| 263 | |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 264 | int |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 265 | dh_gen_key(DH *dh, int need) |
| 266 | { |
Damien Miller | 0fde8ac | 2013-11-21 14:12:23 +1100 | [diff] [blame] | 267 | int pbits; |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 268 | |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 269 | if (need < 0 || dh->p == NULL || |
| 270 | (pbits = BN_num_bits(dh->p)) <= 0 || |
djm@openbsd.org | b8afbe2 | 2015-03-26 06:59:28 +0000 | [diff] [blame] | 271 | need > INT_MAX / 2 || 2 * need > pbits) |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 272 | return SSH_ERR_INVALID_ARGUMENT; |
djm@openbsd.org | 6e7f68c | 2016-02-28 22:27:00 +0000 | [diff] [blame] | 273 | if (need < 256) |
| 274 | need = 256; |
| 275 | /* |
| 276 | * Pollard Rho, Big step/Little Step attacks are O(sqrt(n)), |
| 277 | * so double requested need here. |
| 278 | */ |
deraadt@openbsd.org | 9136ec1 | 2016-09-12 01:22:38 +0000 | [diff] [blame] | 279 | dh->length = MINIMUM(need * 2, pbits - 1); |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 280 | if (DH_generate_key(dh) == 0 || |
| 281 | !dh_pub_is_valid(dh, dh->pub_key)) { |
| 282 | BN_clear_free(dh->priv_key); |
| 283 | return SSH_ERR_LIBCRYPTO_ERROR; |
| 284 | } |
| 285 | return 0; |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 286 | } |
| 287 | |
| 288 | DH * |
| 289 | dh_new_group_asc(const char *gen, const char *modulus) |
| 290 | { |
| 291 | DH *dh; |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 292 | |
Damien Miller | da75516 | 2002-01-22 23:09:22 +1100 | [diff] [blame] | 293 | if ((dh = DH_new()) == NULL) |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 294 | return NULL; |
| 295 | if (BN_hex2bn(&dh->p, modulus) == 0 || |
| 296 | BN_hex2bn(&dh->g, gen) == 0) { |
| 297 | DH_free(dh); |
| 298 | return NULL; |
| 299 | } |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 300 | return (dh); |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * This just returns the group, we still need to generate the exchange |
| 305 | * value. |
| 306 | */ |
| 307 | |
| 308 | DH * |
| 309 | dh_new_group(BIGNUM *gen, BIGNUM *modulus) |
| 310 | { |
| 311 | DH *dh; |
| 312 | |
Damien Miller | da75516 | 2002-01-22 23:09:22 +1100 | [diff] [blame] | 313 | if ((dh = DH_new()) == NULL) |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 314 | return NULL; |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 315 | dh->p = modulus; |
| 316 | dh->g = gen; |
| 317 | |
| 318 | return (dh); |
| 319 | } |
| 320 | |
djm@openbsd.org | 0e8eeec | 2016-05-02 10:26:04 +0000 | [diff] [blame] | 321 | /* rfc2409 "Second Oakley Group" (1024 bits) */ |
Damien Miller | 9709f90 | 2001-03-30 10:50:10 +1000 | [diff] [blame] | 322 | DH * |
| 323 | dh_new_group1(void) |
| 324 | { |
| 325 | static char *gen = "2", *group1 = |
| 326 | "FFFFFFFF" "FFFFFFFF" "C90FDAA2" "2168C234" "C4C6628B" "80DC1CD1" |
| 327 | "29024E08" "8A67CC74" "020BBEA6" "3B139B22" "514A0879" "8E3404DD" |
| 328 | "EF9519B3" "CD3A431B" "302B0A6D" "F25F1437" "4FE1356D" "6D51C245" |
| 329 | "E485B576" "625E7EC6" "F44C42E9" "A637ED6B" "0BFF5CB6" "F406B7ED" |
| 330 | "EE386BFB" "5A899FA5" "AE9F2411" "7C4B1FE6" "49286651" "ECE65381" |
| 331 | "FFFFFFFF" "FFFFFFFF"; |
| 332 | |
| 333 | return (dh_new_group_asc(gen, group1)); |
| 334 | } |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 335 | |
djm@openbsd.org | 0e8eeec | 2016-05-02 10:26:04 +0000 | [diff] [blame] | 336 | /* rfc3526 group 14 "2048-bit MODP Group" */ |
Damien Miller | f675fc4 | 2004-06-15 10:30:09 +1000 | [diff] [blame] | 337 | DH * |
| 338 | dh_new_group14(void) |
| 339 | { |
| 340 | static char *gen = "2", *group14 = |
| 341 | "FFFFFFFF" "FFFFFFFF" "C90FDAA2" "2168C234" "C4C6628B" "80DC1CD1" |
| 342 | "29024E08" "8A67CC74" "020BBEA6" "3B139B22" "514A0879" "8E3404DD" |
| 343 | "EF9519B3" "CD3A431B" "302B0A6D" "F25F1437" "4FE1356D" "6D51C245" |
| 344 | "E485B576" "625E7EC6" "F44C42E9" "A637ED6B" "0BFF5CB6" "F406B7ED" |
| 345 | "EE386BFB" "5A899FA5" "AE9F2411" "7C4B1FE6" "49286651" "ECE45B3D" |
| 346 | "C2007CB8" "A163BF05" "98DA4836" "1C55D39A" "69163FA8" "FD24CF5F" |
| 347 | "83655D23" "DCA3AD96" "1C62F356" "208552BB" "9ED52907" "7096966D" |
| 348 | "670C354E" "4ABC9804" "F1746C08" "CA18217C" "32905E46" "2E36CE3B" |
| 349 | "E39E772C" "180E8603" "9B2783A2" "EC07A28F" "B5C55DF0" "6F4C52C9" |
| 350 | "DE2BCBF6" "95581718" "3995497C" "EA956AE5" "15D22618" "98FA0510" |
| 351 | "15728E5A" "8AACAA68" "FFFFFFFF" "FFFFFFFF"; |
| 352 | |
| 353 | return (dh_new_group_asc(gen, group14)); |
| 354 | } |
| 355 | |
djm@openbsd.org | 0e8eeec | 2016-05-02 10:26:04 +0000 | [diff] [blame] | 356 | /* rfc3526 group 16 "4096-bit MODP Group" */ |
dtucker@openbsd.org | 40f6429 | 2015-05-27 23:39:18 +0000 | [diff] [blame] | 357 | DH * |
djm@openbsd.org | 0e8eeec | 2016-05-02 10:26:04 +0000 | [diff] [blame] | 358 | dh_new_group16(void) |
dtucker@openbsd.org | 40f6429 | 2015-05-27 23:39:18 +0000 | [diff] [blame] | 359 | { |
| 360 | static char *gen = "2", *group16 = |
| 361 | "FFFFFFFF" "FFFFFFFF" "C90FDAA2" "2168C234" "C4C6628B" "80DC1CD1" |
| 362 | "29024E08" "8A67CC74" "020BBEA6" "3B139B22" "514A0879" "8E3404DD" |
| 363 | "EF9519B3" "CD3A431B" "302B0A6D" "F25F1437" "4FE1356D" "6D51C245" |
| 364 | "E485B576" "625E7EC6" "F44C42E9" "A637ED6B" "0BFF5CB6" "F406B7ED" |
| 365 | "EE386BFB" "5A899FA5" "AE9F2411" "7C4B1FE6" "49286651" "ECE45B3D" |
| 366 | "C2007CB8" "A163BF05" "98DA4836" "1C55D39A" "69163FA8" "FD24CF5F" |
| 367 | "83655D23" "DCA3AD96" "1C62F356" "208552BB" "9ED52907" "7096966D" |
| 368 | "670C354E" "4ABC9804" "F1746C08" "CA18217C" "32905E46" "2E36CE3B" |
| 369 | "E39E772C" "180E8603" "9B2783A2" "EC07A28F" "B5C55DF0" "6F4C52C9" |
| 370 | "DE2BCBF6" "95581718" "3995497C" "EA956AE5" "15D22618" "98FA0510" |
| 371 | "15728E5A" "8AAAC42D" "AD33170D" "04507A33" "A85521AB" "DF1CBA64" |
| 372 | "ECFB8504" "58DBEF0A" "8AEA7157" "5D060C7D" "B3970F85" "A6E1E4C7" |
| 373 | "ABF5AE8C" "DB0933D7" "1E8C94E0" "4A25619D" "CEE3D226" "1AD2EE6B" |
| 374 | "F12FFA06" "D98A0864" "D8760273" "3EC86A64" "521F2B18" "177B200C" |
| 375 | "BBE11757" "7A615D6C" "770988C0" "BAD946E2" "08E24FA0" "74E5AB31" |
| 376 | "43DB5BFC" "E0FD108E" "4B82D120" "A9210801" "1A723C12" "A787E6D7" |
| 377 | "88719A10" "BDBA5B26" "99C32718" "6AF4E23C" "1A946834" "B6150BDA" |
| 378 | "2583E9CA" "2AD44CE8" "DBBBC2DB" "04DE8EF9" "2E8EFC14" "1FBECAA6" |
| 379 | "287C5947" "4E6BC05D" "99B2964F" "A090C3A2" "233BA186" "515BE7ED" |
| 380 | "1F612970" "CEE2D7AF" "B81BDD76" "2170481C" "D0069127" "D5B05AA9" |
| 381 | "93B4EA98" "8D8FDDC1" "86FFB7DC" "90A6C08F" "4DF435C9" "34063199" |
| 382 | "FFFFFFFF" "FFFFFFFF"; |
| 383 | |
dtucker@openbsd.org | 40f6429 | 2015-05-27 23:39:18 +0000 | [diff] [blame] | 384 | return (dh_new_group_asc(gen, group16)); |
| 385 | } |
| 386 | |
djm@openbsd.org | 0e8eeec | 2016-05-02 10:26:04 +0000 | [diff] [blame] | 387 | /* rfc3526 group 18 "8192-bit MODP Group" */ |
| 388 | DH * |
| 389 | dh_new_group18(void) |
| 390 | { |
| 391 | static char *gen = "2", *group16 = |
| 392 | "FFFFFFFF" "FFFFFFFF" "C90FDAA2" "2168C234" "C4C6628B" "80DC1CD1" |
| 393 | "29024E08" "8A67CC74" "020BBEA6" "3B139B22" "514A0879" "8E3404DD" |
| 394 | "EF9519B3" "CD3A431B" "302B0A6D" "F25F1437" "4FE1356D" "6D51C245" |
| 395 | "E485B576" "625E7EC6" "F44C42E9" "A637ED6B" "0BFF5CB6" "F406B7ED" |
| 396 | "EE386BFB" "5A899FA5" "AE9F2411" "7C4B1FE6" "49286651" "ECE45B3D" |
| 397 | "C2007CB8" "A163BF05" "98DA4836" "1C55D39A" "69163FA8" "FD24CF5F" |
| 398 | "83655D23" "DCA3AD96" "1C62F356" "208552BB" "9ED52907" "7096966D" |
| 399 | "670C354E" "4ABC9804" "F1746C08" "CA18217C" "32905E46" "2E36CE3B" |
| 400 | "E39E772C" "180E8603" "9B2783A2" "EC07A28F" "B5C55DF0" "6F4C52C9" |
| 401 | "DE2BCBF6" "95581718" "3995497C" "EA956AE5" "15D22618" "98FA0510" |
| 402 | "15728E5A" "8AAAC42D" "AD33170D" "04507A33" "A85521AB" "DF1CBA64" |
| 403 | "ECFB8504" "58DBEF0A" "8AEA7157" "5D060C7D" "B3970F85" "A6E1E4C7" |
| 404 | "ABF5AE8C" "DB0933D7" "1E8C94E0" "4A25619D" "CEE3D226" "1AD2EE6B" |
| 405 | "F12FFA06" "D98A0864" "D8760273" "3EC86A64" "521F2B18" "177B200C" |
| 406 | "BBE11757" "7A615D6C" "770988C0" "BAD946E2" "08E24FA0" "74E5AB31" |
| 407 | "43DB5BFC" "E0FD108E" "4B82D120" "A9210801" "1A723C12" "A787E6D7" |
| 408 | "88719A10" "BDBA5B26" "99C32718" "6AF4E23C" "1A946834" "B6150BDA" |
| 409 | "2583E9CA" "2AD44CE8" "DBBBC2DB" "04DE8EF9" "2E8EFC14" "1FBECAA6" |
| 410 | "287C5947" "4E6BC05D" "99B2964F" "A090C3A2" "233BA186" "515BE7ED" |
| 411 | "1F612970" "CEE2D7AF" "B81BDD76" "2170481C" "D0069127" "D5B05AA9" |
| 412 | "93B4EA98" "8D8FDDC1" "86FFB7DC" "90A6C08F" "4DF435C9" "34028492" |
| 413 | "36C3FAB4" "D27C7026" "C1D4DCB2" "602646DE" "C9751E76" "3DBA37BD" |
| 414 | "F8FF9406" "AD9E530E" "E5DB382F" "413001AE" "B06A53ED" "9027D831" |
| 415 | "179727B0" "865A8918" "DA3EDBEB" "CF9B14ED" "44CE6CBA" "CED4BB1B" |
| 416 | "DB7F1447" "E6CC254B" "33205151" "2BD7AF42" "6FB8F401" "378CD2BF" |
| 417 | "5983CA01" "C64B92EC" "F032EA15" "D1721D03" "F482D7CE" "6E74FEF6" |
| 418 | "D55E702F" "46980C82" "B5A84031" "900B1C9E" "59E7C97F" "BEC7E8F3" |
| 419 | "23A97A7E" "36CC88BE" "0F1D45B7" "FF585AC5" "4BD407B2" "2B4154AA" |
| 420 | "CC8F6D7E" "BF48E1D8" "14CC5ED2" "0F8037E0" "A79715EE" "F29BE328" |
| 421 | "06A1D58B" "B7C5DA76" "F550AA3D" "8A1FBFF0" "EB19CCB1" "A313D55C" |
| 422 | "DA56C9EC" "2EF29632" "387FE8D7" "6E3C0468" "043E8F66" "3F4860EE" |
| 423 | "12BF2D5B" "0B7474D6" "E694F91E" "6DBE1159" "74A3926F" "12FEE5E4" |
| 424 | "38777CB6" "A932DF8C" "D8BEC4D0" "73B931BA" "3BC832B6" "8D9DD300" |
| 425 | "741FA7BF" "8AFC47ED" "2576F693" "6BA42466" "3AAB639C" "5AE4F568" |
| 426 | "3423B474" "2BF1C978" "238F16CB" "E39D652D" "E3FDB8BE" "FC848AD9" |
| 427 | "22222E04" "A4037C07" "13EB57A8" "1A23F0C7" "3473FC64" "6CEA306B" |
| 428 | "4BCBC886" "2F8385DD" "FA9D4B7F" "A2C087E8" "79683303" "ED5BDD3A" |
| 429 | "062B3CF5" "B3A278A6" "6D2A13F8" "3F44F82D" "DF310EE0" "74AB6A36" |
| 430 | "4597E899" "A0255DC1" "64F31CC5" "0846851D" "F9AB4819" "5DED7EA1" |
| 431 | "B1D510BD" "7EE74D73" "FAF36BC3" "1ECFA268" "359046F4" "EB879F92" |
| 432 | "4009438B" "481C6CD7" "889A002E" "D5EE382B" "C9190DA6" "FC026E47" |
| 433 | "9558E447" "5677E9AA" "9E3050E2" "765694DF" "C81F56E8" "80B96E71" |
| 434 | "60C980DD" "98EDD3DF" "FFFFFFFF" "FFFFFFFF"; |
| 435 | |
| 436 | return (dh_new_group_asc(gen, group16)); |
| 437 | } |
| 438 | |
| 439 | /* Select fallback group used by DH-GEX if moduli file cannot be read. */ |
| 440 | DH * |
| 441 | dh_new_group_fallback(int max) |
| 442 | { |
| 443 | debug3("%s: requested max size %d", __func__, max); |
| 444 | if (max < 3072) { |
| 445 | debug3("using 2k bit group 14"); |
| 446 | return dh_new_group14(); |
| 447 | } else if (max < 6144) { |
| 448 | debug3("using 4k bit group 16"); |
| 449 | return dh_new_group16(); |
| 450 | } |
| 451 | debug3("using 8k bit group 18"); |
| 452 | return dh_new_group18(); |
| 453 | } |
| 454 | |
dtucker@openbsd.org | 40f6429 | 2015-05-27 23:39:18 +0000 | [diff] [blame] | 455 | /* |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 456 | * Estimates the group order for a Diffie-Hellman group that has an |
Darren Tucker | df62d71 | 2013-10-10 10:32:39 +1100 | [diff] [blame] | 457 | * attack complexity approximately the same as O(2**bits). |
| 458 | * Values from NIST Special Publication 800-57: Recommendation for Key |
| 459 | * Management Part 1 (rev 3) limited by the recommended maximum value |
| 460 | * from RFC4419 section 3. |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 461 | */ |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 462 | u_int |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 463 | dh_estimate(int bits) |
| 464 | { |
Darren Tucker | df62d71 | 2013-10-10 10:32:39 +1100 | [diff] [blame] | 465 | if (bits <= 112) |
| 466 | return 2048; |
Damien Miller | 8975ddf | 2003-12-17 16:33:53 +1100 | [diff] [blame] | 467 | if (bits <= 128) |
Darren Tucker | df62d71 | 2013-10-10 10:32:39 +1100 | [diff] [blame] | 468 | return 3072; |
Damien Miller | 8975ddf | 2003-12-17 16:33:53 +1100 | [diff] [blame] | 469 | if (bits <= 192) |
Darren Tucker | df62d71 | 2013-10-10 10:32:39 +1100 | [diff] [blame] | 470 | return 7680; |
| 471 | return 8192; |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 472 | } |
Marcus Folkesson | 6b373e4 | 2017-10-28 19:48:39 +0200 | [diff] [blame] | 473 | |
| 474 | #endif /* WITH_OPENSSL */ |