Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1 | /* $OpenBSD: key.c,v 1.92 2010/08/31 11:54:45 djm Exp $ */ |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 3 | * read_bignum(): |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * |
| 6 | * As far as I am concerned, the code I have written for this software |
| 7 | * can be used freely for any purpose. Any derived versions of this |
| 8 | * software must be clearly marked as such, and if the derived work is |
| 9 | * incompatible with the protocol description in the RFC file, it must be |
| 10 | * called by a name other than "ssh" or "Secure Shell". |
| 11 | * |
| 12 | * |
Ben Lindstrom | 4469723 | 2001-07-04 03:32:30 +0000 | [diff] [blame] | 13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
Darren Tucker | 0f0ef0a | 2008-06-13 08:58:05 +1000 | [diff] [blame] | 14 | * Copyright (c) 2008 Alexander von Gernler. All rights reserved. |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 15 | * |
| 16 | * Redistribution and use in source and binary forms, with or without |
| 17 | * modification, are permitted provided that the following conditions |
| 18 | * are met: |
| 19 | * 1. Redistributions of source code must retain the above copyright |
| 20 | * notice, this list of conditions and the following disclaimer. |
| 21 | * 2. Redistributions in binary form must reproduce the above copyright |
| 22 | * notice, this list of conditions and the following disclaimer in the |
| 23 | * documentation and/or other materials provided with the distribution. |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 35 | */ |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 36 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 37 | #include "includes.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 38 | |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 39 | #include <sys/param.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 40 | #include <sys/types.h> |
| 41 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 42 | #include <openssl/evp.h> |
Darren Tucker | 3d295a6 | 2008-02-28 19:22:04 +1100 | [diff] [blame] | 43 | #include <openbsd-compat/openssl-compat.h> |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 44 | |
Damien Miller | ded319c | 2006-09-01 15:38:36 +1000 | [diff] [blame] | 45 | #include <stdarg.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 46 | #include <stdio.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 47 | #include <string.h> |
| 48 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 49 | #include "xmalloc.h" |
| 50 | #include "key.h" |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 51 | #include "rsa.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 52 | #include "uuencode.h" |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 53 | #include "buffer.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 54 | #include "log.h" |
Damien Miller | 8a0268f | 2010-07-16 13:57:51 +1000 | [diff] [blame] | 55 | #include "misc.h" |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 56 | #include "ssh2.h" |
| 57 | |
| 58 | static struct KeyCert * |
| 59 | cert_new(void) |
| 60 | { |
| 61 | struct KeyCert *cert; |
| 62 | |
| 63 | cert = xcalloc(1, sizeof(*cert)); |
| 64 | buffer_init(&cert->certblob); |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 65 | buffer_init(&cert->critical); |
| 66 | buffer_init(&cert->extensions); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 67 | cert->key_id = NULL; |
| 68 | cert->principals = NULL; |
| 69 | cert->signature_key = NULL; |
| 70 | return cert; |
| 71 | } |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 72 | |
| 73 | Key * |
| 74 | key_new(int type) |
| 75 | { |
| 76 | Key *k; |
| 77 | RSA *rsa; |
| 78 | DSA *dsa; |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 79 | k = xcalloc(1, sizeof(*k)); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 80 | k->type = type; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 81 | k->ecdsa = NULL; |
| 82 | k->ecdsa_nid = -1; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 83 | k->dsa = NULL; |
| 84 | k->rsa = NULL; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 85 | k->cert = NULL; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 86 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 87 | case KEY_RSA1: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 88 | case KEY_RSA: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 89 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 90 | case KEY_RSA_CERT: |
Damien Miller | da75516 | 2002-01-22 23:09:22 +1100 | [diff] [blame] | 91 | if ((rsa = RSA_new()) == NULL) |
| 92 | fatal("key_new: RSA_new failed"); |
| 93 | if ((rsa->n = BN_new()) == NULL) |
| 94 | fatal("key_new: BN_new failed"); |
| 95 | if ((rsa->e = BN_new()) == NULL) |
| 96 | fatal("key_new: BN_new failed"); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 97 | k->rsa = rsa; |
| 98 | break; |
| 99 | case KEY_DSA: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 100 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 101 | case KEY_DSA_CERT: |
Damien Miller | da75516 | 2002-01-22 23:09:22 +1100 | [diff] [blame] | 102 | if ((dsa = DSA_new()) == NULL) |
| 103 | fatal("key_new: DSA_new failed"); |
| 104 | if ((dsa->p = BN_new()) == NULL) |
| 105 | fatal("key_new: BN_new failed"); |
| 106 | if ((dsa->q = BN_new()) == NULL) |
| 107 | fatal("key_new: BN_new failed"); |
| 108 | if ((dsa->g = BN_new()) == NULL) |
| 109 | fatal("key_new: BN_new failed"); |
| 110 | if ((dsa->pub_key = BN_new()) == NULL) |
| 111 | fatal("key_new: BN_new failed"); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 112 | k->dsa = dsa; |
| 113 | break; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 114 | case KEY_ECDSA: |
| 115 | case KEY_ECDSA_CERT: |
| 116 | /* Cannot do anything until we know the group */ |
| 117 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 118 | case KEY_UNSPEC: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 119 | break; |
| 120 | default: |
| 121 | fatal("key_new: bad key type %d", k->type); |
| 122 | break; |
| 123 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 124 | |
| 125 | if (key_is_cert(k)) |
| 126 | k->cert = cert_new(); |
| 127 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 128 | return k; |
| 129 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 130 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 131 | void |
| 132 | key_add_private(Key *k) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 133 | { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 134 | switch (k->type) { |
| 135 | case KEY_RSA1: |
| 136 | case KEY_RSA: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 137 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 138 | case KEY_RSA_CERT: |
Damien Miller | da75516 | 2002-01-22 23:09:22 +1100 | [diff] [blame] | 139 | if ((k->rsa->d = BN_new()) == NULL) |
| 140 | fatal("key_new_private: BN_new failed"); |
| 141 | if ((k->rsa->iqmp = BN_new()) == NULL) |
| 142 | fatal("key_new_private: BN_new failed"); |
| 143 | if ((k->rsa->q = BN_new()) == NULL) |
| 144 | fatal("key_new_private: BN_new failed"); |
| 145 | if ((k->rsa->p = BN_new()) == NULL) |
| 146 | fatal("key_new_private: BN_new failed"); |
| 147 | if ((k->rsa->dmq1 = BN_new()) == NULL) |
| 148 | fatal("key_new_private: BN_new failed"); |
| 149 | if ((k->rsa->dmp1 = BN_new()) == NULL) |
| 150 | fatal("key_new_private: BN_new failed"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 151 | break; |
| 152 | case KEY_DSA: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 153 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 154 | case KEY_DSA_CERT: |
Damien Miller | da75516 | 2002-01-22 23:09:22 +1100 | [diff] [blame] | 155 | if ((k->dsa->priv_key = BN_new()) == NULL) |
| 156 | fatal("key_new_private: BN_new failed"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 157 | break; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 158 | case KEY_ECDSA: |
| 159 | case KEY_ECDSA_CERT: |
| 160 | /* Cannot do anything until we know the group */ |
| 161 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 162 | case KEY_UNSPEC: |
| 163 | break; |
| 164 | default: |
| 165 | break; |
| 166 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | Key * |
| 170 | key_new_private(int type) |
| 171 | { |
| 172 | Key *k = key_new(type); |
| 173 | |
| 174 | key_add_private(k); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 175 | return k; |
| 176 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 177 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 178 | static void |
| 179 | cert_free(struct KeyCert *cert) |
| 180 | { |
| 181 | u_int i; |
| 182 | |
| 183 | buffer_free(&cert->certblob); |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 184 | buffer_free(&cert->critical); |
| 185 | buffer_free(&cert->extensions); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 186 | if (cert->key_id != NULL) |
| 187 | xfree(cert->key_id); |
| 188 | for (i = 0; i < cert->nprincipals; i++) |
| 189 | xfree(cert->principals[i]); |
| 190 | if (cert->principals != NULL) |
| 191 | xfree(cert->principals); |
| 192 | if (cert->signature_key != NULL) |
| 193 | key_free(cert->signature_key); |
| 194 | } |
| 195 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 196 | void |
| 197 | key_free(Key *k) |
| 198 | { |
Damien Miller | 429fcc2 | 2006-03-26 14:02:16 +1100 | [diff] [blame] | 199 | if (k == NULL) |
Damien Miller | bbaad77 | 2006-03-26 14:03:03 +1100 | [diff] [blame] | 200 | fatal("key_free: key is NULL"); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 201 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 202 | case KEY_RSA1: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 203 | case KEY_RSA: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 204 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 205 | case KEY_RSA_CERT: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 206 | if (k->rsa != NULL) |
| 207 | RSA_free(k->rsa); |
| 208 | k->rsa = NULL; |
| 209 | break; |
| 210 | case KEY_DSA: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 211 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 212 | case KEY_DSA_CERT: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 213 | if (k->dsa != NULL) |
| 214 | DSA_free(k->dsa); |
| 215 | k->dsa = NULL; |
| 216 | break; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 217 | case KEY_ECDSA: |
| 218 | case KEY_ECDSA_CERT: |
| 219 | if (k->ecdsa != NULL) |
| 220 | EC_KEY_free(k->ecdsa); |
| 221 | k->ecdsa = NULL; |
| 222 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 223 | case KEY_UNSPEC: |
| 224 | break; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 225 | default: |
| 226 | fatal("key_free: bad key type %d", k->type); |
| 227 | break; |
| 228 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 229 | if (key_is_cert(k)) { |
| 230 | if (k->cert != NULL) |
| 231 | cert_free(k->cert); |
| 232 | k->cert = NULL; |
| 233 | } |
| 234 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 235 | xfree(k); |
| 236 | } |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 237 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 238 | static int |
| 239 | cert_compare(struct KeyCert *a, struct KeyCert *b) |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 240 | { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 241 | if (a == NULL && b == NULL) |
| 242 | return 1; |
| 243 | if (a == NULL || b == NULL) |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 244 | return 0; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 245 | if (buffer_len(&a->certblob) != buffer_len(&b->certblob)) |
| 246 | return 0; |
Damien Miller | ea1651c | 2010-07-16 13:58:37 +1000 | [diff] [blame] | 247 | if (timingsafe_bcmp(buffer_ptr(&a->certblob), buffer_ptr(&b->certblob), |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 248 | buffer_len(&a->certblob)) != 0) |
| 249 | return 0; |
| 250 | return 1; |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * Compare public portions of key only, allowing comparisons between |
| 255 | * certificates and plain keys too. |
| 256 | */ |
| 257 | int |
| 258 | key_equal_public(const Key *a, const Key *b) |
| 259 | { |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 260 | BN_CTX *bnctx; |
| 261 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 262 | if (a == NULL || b == NULL || |
| 263 | key_type_plain(a->type) != key_type_plain(b->type)) |
| 264 | return 0; |
| 265 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 266 | switch (a->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 267 | case KEY_RSA1: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 268 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 269 | case KEY_RSA_CERT: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 270 | case KEY_RSA: |
| 271 | return a->rsa != NULL && b->rsa != NULL && |
| 272 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && |
| 273 | BN_cmp(a->rsa->n, b->rsa->n) == 0; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 274 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 275 | case KEY_DSA_CERT: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 276 | case KEY_DSA: |
| 277 | return a->dsa != NULL && b->dsa != NULL && |
| 278 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && |
| 279 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && |
| 280 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && |
| 281 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 282 | case KEY_ECDSA_CERT: |
| 283 | case KEY_ECDSA: |
| 284 | if (a->ecdsa == NULL || b->ecdsa == NULL || |
| 285 | EC_KEY_get0_public_key(a->ecdsa) == NULL || |
| 286 | EC_KEY_get0_public_key(b->ecdsa) == NULL) |
| 287 | return 0; |
| 288 | if ((bnctx = BN_CTX_new()) == NULL) |
| 289 | fatal("%s: BN_CTX_new failed", __func__); |
| 290 | if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa), |
| 291 | EC_KEY_get0_group(b->ecdsa), bnctx) != 0 || |
| 292 | EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa), |
| 293 | EC_KEY_get0_public_key(a->ecdsa), |
| 294 | EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) { |
| 295 | BN_CTX_free(bnctx); |
| 296 | return 0; |
| 297 | } |
| 298 | BN_CTX_free(bnctx); |
| 299 | return 1; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 300 | default: |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 301 | fatal("key_equal: bad key type %d", a->type); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 302 | } |
Damien Miller | 87dd5f2 | 2008-07-11 17:35:09 +1000 | [diff] [blame] | 303 | /* NOTREACHED */ |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 304 | } |
| 305 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 306 | int |
| 307 | key_equal(const Key *a, const Key *b) |
| 308 | { |
| 309 | if (a == NULL || b == NULL || a->type != b->type) |
| 310 | return 0; |
| 311 | if (key_is_cert(a)) { |
| 312 | if (!cert_compare(a->cert, b->cert)) |
| 313 | return 0; |
| 314 | } |
| 315 | return key_equal_public(a, b); |
| 316 | } |
| 317 | |
Damien Miller | 37876e9 | 2003-05-15 10:19:46 +1000 | [diff] [blame] | 318 | u_char* |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 319 | key_fingerprint_raw(Key *k, enum fp_type dgst_type, u_int *dgst_raw_length) |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 320 | { |
Ben Lindstrom | 80cb27d | 2002-03-05 01:33:36 +0000 | [diff] [blame] | 321 | const EVP_MD *md = NULL; |
Ben Lindstrom | f0b4853 | 2001-03-12 02:59:31 +0000 | [diff] [blame] | 322 | EVP_MD_CTX ctx; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 323 | u_char *blob = NULL; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 324 | u_char *retval = NULL; |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 325 | u_int len = 0; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 326 | int nlen, elen, otype; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 327 | |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 328 | *dgst_raw_length = 0; |
| 329 | |
Ben Lindstrom | f0b4853 | 2001-03-12 02:59:31 +0000 | [diff] [blame] | 330 | switch (dgst_type) { |
| 331 | case SSH_FP_MD5: |
| 332 | md = EVP_md5(); |
| 333 | break; |
| 334 | case SSH_FP_SHA1: |
| 335 | md = EVP_sha1(); |
| 336 | break; |
| 337 | default: |
| 338 | fatal("key_fingerprint_raw: bad digest type %d", |
| 339 | dgst_type); |
| 340 | } |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 341 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 342 | case KEY_RSA1: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 343 | nlen = BN_num_bytes(k->rsa->n); |
| 344 | elen = BN_num_bytes(k->rsa->e); |
| 345 | len = nlen + elen; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 346 | blob = xmalloc(len); |
| 347 | BN_bn2bin(k->rsa->n, blob); |
| 348 | BN_bn2bin(k->rsa->e, blob + nlen); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 349 | break; |
| 350 | case KEY_DSA: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 351 | case KEY_ECDSA: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 352 | case KEY_RSA: |
| 353 | key_to_blob(k, &blob, &len); |
| 354 | break; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 355 | case KEY_DSA_CERT_V00: |
| 356 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 357 | case KEY_DSA_CERT: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 358 | case KEY_ECDSA_CERT: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 359 | case KEY_RSA_CERT: |
| 360 | /* We want a fingerprint of the _key_ not of the cert */ |
| 361 | otype = k->type; |
| 362 | k->type = key_type_plain(k->type); |
| 363 | key_to_blob(k, &blob, &len); |
| 364 | k->type = otype; |
| 365 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 366 | case KEY_UNSPEC: |
| 367 | return retval; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 368 | default: |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 369 | fatal("key_fingerprint_raw: bad key type %d", k->type); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 370 | break; |
| 371 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 372 | if (blob != NULL) { |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 373 | retval = xmalloc(EVP_MAX_MD_SIZE); |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 374 | EVP_DigestInit(&ctx, md); |
| 375 | EVP_DigestUpdate(&ctx, blob, len); |
Damien Miller | 3672e4b | 2002-02-05 11:54:07 +1100 | [diff] [blame] | 376 | EVP_DigestFinal(&ctx, retval, dgst_raw_length); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 377 | memset(blob, 0, len); |
| 378 | xfree(blob); |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 379 | } else { |
| 380 | fatal("key_fingerprint_raw: blob is null"); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 381 | } |
| 382 | return retval; |
| 383 | } |
| 384 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 385 | static char * |
| 386 | key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len) |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 387 | { |
| 388 | char *retval; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 389 | u_int i; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 390 | |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 391 | retval = xcalloc(1, dgst_raw_len * 3 + 1); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 392 | for (i = 0; i < dgst_raw_len; i++) { |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 393 | char hex[4]; |
| 394 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); |
Darren Tucker | 2958861 | 2003-07-14 17:28:34 +1000 | [diff] [blame] | 395 | strlcat(retval, hex, dgst_raw_len * 3 + 1); |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 396 | } |
Darren Tucker | 2958861 | 2003-07-14 17:28:34 +1000 | [diff] [blame] | 397 | |
| 398 | /* Remove the trailing ':' character */ |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 399 | retval[(dgst_raw_len * 3) - 1] = '\0'; |
| 400 | return retval; |
| 401 | } |
| 402 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 403 | static char * |
| 404 | key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len) |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 405 | { |
| 406 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; |
| 407 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', |
| 408 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 409 | u_int i, j = 0, rounds, seed = 1; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 410 | char *retval; |
| 411 | |
| 412 | rounds = (dgst_raw_len / 2) + 1; |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 413 | retval = xcalloc((rounds * 6), sizeof(char)); |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 414 | retval[j++] = 'x'; |
| 415 | for (i = 0; i < rounds; i++) { |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 416 | u_int idx0, idx1, idx2, idx3, idx4; |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 417 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
| 418 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 419 | seed) % 6; |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 420 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
| 421 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 422 | (seed / 6)) % 6; |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 423 | retval[j++] = vowels[idx0]; |
| 424 | retval[j++] = consonants[idx1]; |
| 425 | retval[j++] = vowels[idx2]; |
| 426 | if ((i + 1) < rounds) { |
| 427 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; |
| 428 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; |
| 429 | retval[j++] = consonants[idx3]; |
| 430 | retval[j++] = '-'; |
| 431 | retval[j++] = consonants[idx4]; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 432 | seed = ((seed * 5) + |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 433 | ((((u_int)(dgst_raw[2 * i])) * 7) + |
| 434 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 435 | } |
| 436 | } else { |
| 437 | idx0 = seed % 6; |
| 438 | idx1 = 16; |
| 439 | idx2 = seed / 6; |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 440 | retval[j++] = vowels[idx0]; |
| 441 | retval[j++] = consonants[idx1]; |
| 442 | retval[j++] = vowels[idx2]; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 443 | } |
| 444 | } |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 445 | retval[j++] = 'x'; |
| 446 | retval[j++] = '\0'; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 447 | return retval; |
| 448 | } |
| 449 | |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 450 | /* |
| 451 | * Draw an ASCII-Art representing the fingerprint so human brain can |
| 452 | * profit from its built-in pattern recognition ability. |
| 453 | * This technique is called "random art" and can be found in some |
| 454 | * scientific publications like this original paper: |
| 455 | * |
| 456 | * "Hash Visualization: a New Technique to improve Real-World Security", |
| 457 | * Perrig A. and Song D., 1999, International Workshop on Cryptographic |
| 458 | * Techniques and E-Commerce (CrypTEC '99) |
| 459 | * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf |
| 460 | * |
| 461 | * The subject came up in a talk by Dan Kaminsky, too. |
| 462 | * |
| 463 | * If you see the picture is different, the key is different. |
| 464 | * If the picture looks the same, you still know nothing. |
| 465 | * |
| 466 | * The algorithm used here is a worm crawling over a discrete plane, |
| 467 | * leaving a trace (augmenting the field) everywhere it goes. |
| 468 | * Movement is taken from dgst_raw 2bit-wise. Bumping into walls |
| 469 | * makes the respective movement vector be ignored for this turn. |
| 470 | * Graphs are not unambiguous, because circles in graphs can be |
| 471 | * walked in either direction. |
| 472 | */ |
Darren Tucker | 987ac84 | 2008-06-13 04:54:40 +1000 | [diff] [blame] | 473 | |
| 474 | /* |
| 475 | * Field sizes for the random art. Have to be odd, so the starting point |
| 476 | * can be in the exact middle of the picture, and FLDBASE should be >=8 . |
| 477 | * Else pictures would be too dense, and drawing the frame would |
| 478 | * fail, too, because the key type would not fit in anymore. |
| 479 | */ |
| 480 | #define FLDBASE 8 |
| 481 | #define FLDSIZE_Y (FLDBASE + 1) |
| 482 | #define FLDSIZE_X (FLDBASE * 2 + 1) |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 483 | static char * |
Darren Tucker | 987ac84 | 2008-06-13 04:54:40 +1000 | [diff] [blame] | 484 | key_fingerprint_randomart(u_char *dgst_raw, u_int dgst_raw_len, const Key *k) |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 485 | { |
| 486 | /* |
| 487 | * Chars to be used after each other every time the worm |
| 488 | * intersects with itself. Matter of taste. |
| 489 | */ |
Darren Tucker | 4b3b977 | 2008-06-13 04:55:10 +1000 | [diff] [blame] | 490 | char *augmentation_string = " .o+=*BOX@%&#/^SE"; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 491 | char *retval, *p; |
Darren Tucker | 014d76f | 2008-06-13 04:43:51 +1000 | [diff] [blame] | 492 | u_char field[FLDSIZE_X][FLDSIZE_Y]; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 493 | u_int i, b; |
| 494 | int x, y; |
Darren Tucker | d32b28a | 2008-06-13 04:45:50 +1000 | [diff] [blame] | 495 | size_t len = strlen(augmentation_string) - 1; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 496 | |
| 497 | retval = xcalloc(1, (FLDSIZE_X + 3) * (FLDSIZE_Y + 2)); |
| 498 | |
| 499 | /* initialize field */ |
Darren Tucker | 014d76f | 2008-06-13 04:43:51 +1000 | [diff] [blame] | 500 | memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char)); |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 501 | x = FLDSIZE_X / 2; |
| 502 | y = FLDSIZE_Y / 2; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 503 | |
| 504 | /* process raw key */ |
| 505 | for (i = 0; i < dgst_raw_len; i++) { |
| 506 | int input; |
| 507 | /* each byte conveys four 2-bit move commands */ |
| 508 | input = dgst_raw[i]; |
| 509 | for (b = 0; b < 4; b++) { |
| 510 | /* evaluate 2 bit, rest is shifted later */ |
| 511 | x += (input & 0x1) ? 1 : -1; |
| 512 | y += (input & 0x2) ? 1 : -1; |
| 513 | |
| 514 | /* assure we are still in bounds */ |
| 515 | x = MAX(x, 0); |
| 516 | y = MAX(y, 0); |
| 517 | x = MIN(x, FLDSIZE_X - 1); |
| 518 | y = MIN(y, FLDSIZE_Y - 1); |
| 519 | |
| 520 | /* augment the field */ |
Damien Miller | c6aadd9 | 2008-11-03 19:16:20 +1100 | [diff] [blame] | 521 | if (field[x][y] < len - 2) |
| 522 | field[x][y]++; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 523 | input = input >> 2; |
| 524 | } |
| 525 | } |
Darren Tucker | 4b3b977 | 2008-06-13 04:55:10 +1000 | [diff] [blame] | 526 | |
| 527 | /* mark starting point and end point*/ |
| 528 | field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1; |
| 529 | field[x][y] = len; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 530 | |
| 531 | /* fill in retval */ |
Damien Miller | 007132a | 2008-06-29 22:45:37 +1000 | [diff] [blame] | 532 | snprintf(retval, FLDSIZE_X, "+--[%4s %4u]", key_type(k), key_size(k)); |
Darren Tucker | 987ac84 | 2008-06-13 04:54:40 +1000 | [diff] [blame] | 533 | p = strchr(retval, '\0'); |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 534 | |
| 535 | /* output upper border */ |
Damien Miller | 007132a | 2008-06-29 22:45:37 +1000 | [diff] [blame] | 536 | for (i = p - retval - 1; i < FLDSIZE_X; i++) |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 537 | *p++ = '-'; |
| 538 | *p++ = '+'; |
| 539 | *p++ = '\n'; |
| 540 | |
| 541 | /* output content */ |
| 542 | for (y = 0; y < FLDSIZE_Y; y++) { |
| 543 | *p++ = '|'; |
| 544 | for (x = 0; x < FLDSIZE_X; x++) |
Darren Tucker | d32b28a | 2008-06-13 04:45:50 +1000 | [diff] [blame] | 545 | *p++ = augmentation_string[MIN(field[x][y], len)]; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 546 | *p++ = '|'; |
| 547 | *p++ = '\n'; |
| 548 | } |
| 549 | |
| 550 | /* output lower border */ |
| 551 | *p++ = '+'; |
| 552 | for (i = 0; i < FLDSIZE_X; i++) |
| 553 | *p++ = '-'; |
| 554 | *p++ = '+'; |
| 555 | |
| 556 | return retval; |
| 557 | } |
| 558 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 559 | char * |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 560 | key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 561 | { |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 562 | char *retval = NULL; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 563 | u_char *dgst_raw; |
Damien Miller | 3672e4b | 2002-02-05 11:54:07 +1100 | [diff] [blame] | 564 | u_int dgst_raw_len; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 565 | |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 566 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); |
| 567 | if (!dgst_raw) |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 568 | fatal("key_fingerprint: null from key_fingerprint_raw()"); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 569 | switch (dgst_rep) { |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 570 | case SSH_FP_HEX: |
| 571 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); |
| 572 | break; |
| 573 | case SSH_FP_BUBBLEBABBLE: |
| 574 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); |
| 575 | break; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 576 | case SSH_FP_RANDOMART: |
Darren Tucker | 987ac84 | 2008-06-13 04:54:40 +1000 | [diff] [blame] | 577 | retval = key_fingerprint_randomart(dgst_raw, dgst_raw_len, k); |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 578 | break; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 579 | default: |
Damien Miller | 2f54ada | 2008-11-03 19:24:16 +1100 | [diff] [blame] | 580 | fatal("key_fingerprint: bad digest representation %d", |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 581 | dgst_rep); |
| 582 | break; |
| 583 | } |
| 584 | memset(dgst_raw, 0, dgst_raw_len); |
| 585 | xfree(dgst_raw); |
| 586 | return retval; |
| 587 | } |
| 588 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 589 | /* |
| 590 | * Reads a multiple-precision integer in decimal from the buffer, and advances |
| 591 | * the pointer. The integer must already be initialized. This function is |
| 592 | * permitted to modify the buffer. This leaves *cpp to point just beyond the |
| 593 | * last processed (and maybe modified) character. Note that this may modify |
| 594 | * the buffer containing the number. |
| 595 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 596 | static int |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 597 | read_bignum(char **cpp, BIGNUM * value) |
| 598 | { |
| 599 | char *cp = *cpp; |
| 600 | int old; |
| 601 | |
| 602 | /* Skip any leading whitespace. */ |
| 603 | for (; *cp == ' ' || *cp == '\t'; cp++) |
| 604 | ; |
| 605 | |
| 606 | /* Check that it begins with a decimal digit. */ |
| 607 | if (*cp < '0' || *cp > '9') |
| 608 | return 0; |
| 609 | |
| 610 | /* Save starting position. */ |
| 611 | *cpp = cp; |
| 612 | |
| 613 | /* Move forward until all decimal digits skipped. */ |
| 614 | for (; *cp >= '0' && *cp <= '9'; cp++) |
| 615 | ; |
| 616 | |
| 617 | /* Save the old terminating character, and replace it by \0. */ |
| 618 | old = *cp; |
| 619 | *cp = 0; |
| 620 | |
| 621 | /* Parse the number. */ |
| 622 | if (BN_dec2bn(&value, *cpp) == 0) |
| 623 | return 0; |
| 624 | |
| 625 | /* Restore old terminating character. */ |
| 626 | *cp = old; |
| 627 | |
| 628 | /* Move beyond the number and return success. */ |
| 629 | *cpp = cp; |
| 630 | return 1; |
| 631 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 632 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 633 | static int |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 634 | write_bignum(FILE *f, BIGNUM *num) |
| 635 | { |
| 636 | char *buf = BN_bn2dec(num); |
| 637 | if (buf == NULL) { |
| 638 | error("write_bignum: BN_bn2dec() failed"); |
| 639 | return 0; |
| 640 | } |
| 641 | fprintf(f, " %s", buf); |
Damien Miller | af3030f | 2001-10-10 15:00:49 +1000 | [diff] [blame] | 642 | OPENSSL_free(buf); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 643 | return 1; |
| 644 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 645 | |
Ben Lindstrom | 309f3d1 | 2001-09-20 00:55:53 +0000 | [diff] [blame] | 646 | /* returns 1 ok, -1 error */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 647 | int |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 648 | key_read(Key *ret, char **cpp) |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 649 | { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 650 | Key *k; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 651 | int success = -1; |
| 652 | char *cp, *space; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 653 | int len, n, type, curve_nid = -1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 654 | u_int bits; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 655 | u_char *blob; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 656 | |
| 657 | cp = *cpp; |
| 658 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 659 | switch (ret->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 660 | case KEY_RSA1: |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 661 | /* Get number of bits. */ |
| 662 | if (*cp < '0' || *cp > '9') |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 663 | return -1; /* Bad bit count... */ |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 664 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) |
| 665 | bits = 10 * bits + *cp - '0'; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 666 | if (bits == 0) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 667 | return -1; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 668 | *cpp = cp; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 669 | /* Get public exponent, public modulus. */ |
| 670 | if (!read_bignum(cpp, ret->rsa->e)) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 671 | return -1; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 672 | if (!read_bignum(cpp, ret->rsa->n)) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 673 | return -1; |
Darren Tucker | 561724f | 2010-01-13 22:43:05 +1100 | [diff] [blame] | 674 | /* validate the claimed number of bits */ |
| 675 | if ((u_int)BN_num_bits(ret->rsa->n) != bits) { |
| 676 | verbose("key_read: claimed key size %d does not match " |
| 677 | "actual %d", bits, BN_num_bits(ret->rsa->n)); |
| 678 | return -1; |
| 679 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 680 | success = 1; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 681 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 682 | case KEY_UNSPEC: |
| 683 | case KEY_RSA: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 684 | case KEY_DSA: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 685 | case KEY_ECDSA: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 686 | case KEY_DSA_CERT_V00: |
| 687 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 688 | case KEY_DSA_CERT: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 689 | case KEY_ECDSA_CERT: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 690 | case KEY_RSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 691 | space = strchr(cp, ' '); |
| 692 | if (space == NULL) { |
Damien Miller | 386f1f3 | 2003-02-24 11:54:57 +1100 | [diff] [blame] | 693 | debug3("key_read: missing whitespace"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 694 | return -1; |
| 695 | } |
| 696 | *space = '\0'; |
| 697 | type = key_type_from_name(cp); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 698 | if (key_type_plain(type) == KEY_ECDSA && |
| 699 | (curve_nid = key_ecdsa_nid_from_name(cp)) == -1) { |
| 700 | debug("key_read: invalid curve"); |
| 701 | return -1; |
| 702 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 703 | *space = ' '; |
| 704 | if (type == KEY_UNSPEC) { |
Damien Miller | 386f1f3 | 2003-02-24 11:54:57 +1100 | [diff] [blame] | 705 | debug3("key_read: missing keytype"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 706 | return -1; |
| 707 | } |
| 708 | cp = space+1; |
| 709 | if (*cp == '\0') { |
| 710 | debug3("key_read: short string"); |
| 711 | return -1; |
| 712 | } |
| 713 | if (ret->type == KEY_UNSPEC) { |
| 714 | ret->type = type; |
| 715 | } else if (ret->type != type) { |
| 716 | /* is a key, but different type */ |
| 717 | debug3("key_read: type mismatch"); |
Ben Lindstrom | 309f3d1 | 2001-09-20 00:55:53 +0000 | [diff] [blame] | 718 | return -1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 719 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 720 | len = 2*strlen(cp); |
| 721 | blob = xmalloc(len); |
| 722 | n = uudecode(cp, blob, len); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 723 | if (n < 0) { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 724 | error("key_read: uudecode %s failed", cp); |
Ben Lindstrom | 4cbc181 | 2001-12-06 16:41:41 +0000 | [diff] [blame] | 725 | xfree(blob); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 726 | return -1; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 727 | } |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 728 | k = key_from_blob(blob, (u_int)n); |
Ben Lindstrom | 4cbc181 | 2001-12-06 16:41:41 +0000 | [diff] [blame] | 729 | xfree(blob); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 730 | if (k == NULL) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 731 | error("key_read: key_from_blob %s failed", cp); |
| 732 | return -1; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 733 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 734 | if (k->type != type) { |
| 735 | error("key_read: type mismatch: encoding error"); |
| 736 | key_free(k); |
| 737 | return -1; |
| 738 | } |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 739 | if (key_type_plain(type) == KEY_ECDSA && |
| 740 | curve_nid != k->ecdsa_nid) { |
| 741 | error("key_read: type mismatch: EC curve mismatch"); |
| 742 | key_free(k); |
| 743 | return -1; |
| 744 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 745 | /*XXXX*/ |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 746 | if (key_is_cert(ret)) { |
| 747 | if (!key_is_cert(k)) { |
| 748 | error("key_read: loaded key is not a cert"); |
| 749 | key_free(k); |
| 750 | return -1; |
| 751 | } |
| 752 | if (ret->cert != NULL) |
| 753 | cert_free(ret->cert); |
| 754 | ret->cert = k->cert; |
| 755 | k->cert = NULL; |
| 756 | } |
| 757 | if (key_type_plain(ret->type) == KEY_RSA) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 758 | if (ret->rsa != NULL) |
| 759 | RSA_free(ret->rsa); |
| 760 | ret->rsa = k->rsa; |
| 761 | k->rsa = NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 762 | #ifdef DEBUG_PK |
| 763 | RSA_print_fp(stderr, ret->rsa, 8); |
| 764 | #endif |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 765 | } |
| 766 | if (key_type_plain(ret->type) == KEY_DSA) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 767 | if (ret->dsa != NULL) |
| 768 | DSA_free(ret->dsa); |
| 769 | ret->dsa = k->dsa; |
| 770 | k->dsa = NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 771 | #ifdef DEBUG_PK |
| 772 | DSA_print_fp(stderr, ret->dsa, 8); |
| 773 | #endif |
| 774 | } |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 775 | if (key_type_plain(ret->type) == KEY_ECDSA) { |
| 776 | if (ret->ecdsa != NULL) |
| 777 | EC_KEY_free(ret->ecdsa); |
| 778 | ret->ecdsa = k->ecdsa; |
| 779 | ret->ecdsa_nid = k->ecdsa_nid; |
| 780 | k->ecdsa = NULL; |
| 781 | k->ecdsa_nid = -1; |
| 782 | #ifdef DEBUG_PK |
| 783 | key_dump_ec_key(ret->ecdsa); |
| 784 | #endif |
| 785 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 786 | success = 1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 787 | /*XXXX*/ |
Ben Lindstrom | 4cbc181 | 2001-12-06 16:41:41 +0000 | [diff] [blame] | 788 | key_free(k); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 789 | if (success != 1) |
| 790 | break; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 791 | /* advance cp: skip whitespace and data */ |
| 792 | while (*cp == ' ' || *cp == '\t') |
| 793 | cp++; |
| 794 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') |
| 795 | cp++; |
| 796 | *cpp = cp; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 797 | break; |
| 798 | default: |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 799 | fatal("key_read: bad key type: %d", ret->type); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 800 | break; |
| 801 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 802 | return success; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 803 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 804 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 805 | int |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 806 | key_write(const Key *key, FILE *f) |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 807 | { |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 808 | int n, success = 0; |
| 809 | u_int len, bits = 0; |
Damien Miller | a10f561 | 2002-09-12 09:49:15 +1000 | [diff] [blame] | 810 | u_char *blob; |
| 811 | char *uu; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 812 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 813 | if (key_is_cert(key)) { |
| 814 | if (key->cert == NULL) { |
| 815 | error("%s: no cert data", __func__); |
| 816 | return 0; |
| 817 | } |
| 818 | if (buffer_len(&key->cert->certblob) == 0) { |
| 819 | error("%s: no signed certificate blob", __func__); |
| 820 | return 0; |
| 821 | } |
| 822 | } |
| 823 | |
| 824 | switch (key->type) { |
| 825 | case KEY_RSA1: |
| 826 | if (key->rsa == NULL) |
| 827 | return 0; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 828 | /* size of modulus 'n' */ |
| 829 | bits = BN_num_bits(key->rsa->n); |
| 830 | fprintf(f, "%u", bits); |
| 831 | if (write_bignum(f, key->rsa->e) && |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 832 | write_bignum(f, key->rsa->n)) |
| 833 | return 1; |
| 834 | error("key_write: failed for RSA key"); |
| 835 | return 0; |
| 836 | case KEY_DSA: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 837 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 838 | case KEY_DSA_CERT: |
| 839 | if (key->dsa == NULL) |
| 840 | return 0; |
| 841 | break; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 842 | case KEY_ECDSA: |
| 843 | case KEY_ECDSA_CERT: |
| 844 | if (key->ecdsa == NULL) |
| 845 | return 0; |
| 846 | break; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 847 | case KEY_RSA: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 848 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 849 | case KEY_RSA_CERT: |
| 850 | if (key->rsa == NULL) |
| 851 | return 0; |
| 852 | break; |
| 853 | default: |
| 854 | return 0; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 855 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 856 | |
| 857 | key_to_blob(key, &blob, &len); |
| 858 | uu = xmalloc(2*len); |
| 859 | n = uuencode(blob, len, uu, 2*len); |
| 860 | if (n > 0) { |
| 861 | fprintf(f, "%s %s", key_ssh_name(key), uu); |
| 862 | success = 1; |
| 863 | } |
| 864 | xfree(blob); |
| 865 | xfree(uu); |
| 866 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 867 | return success; |
| 868 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 869 | |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 870 | const char * |
| 871 | key_type(const Key *k) |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 872 | { |
| 873 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 874 | case KEY_RSA1: |
| 875 | return "RSA1"; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 876 | case KEY_RSA: |
| 877 | return "RSA"; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 878 | case KEY_DSA: |
| 879 | return "DSA"; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 880 | case KEY_ECDSA: |
| 881 | return "ECDSA"; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 882 | case KEY_RSA_CERT_V00: |
| 883 | return "RSA-CERT-V00"; |
| 884 | case KEY_DSA_CERT_V00: |
| 885 | return "DSA-CERT-V00"; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 886 | case KEY_RSA_CERT: |
| 887 | return "RSA-CERT"; |
| 888 | case KEY_DSA_CERT: |
| 889 | return "DSA-CERT"; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 890 | case KEY_ECDSA_CERT: |
| 891 | return "ECDSA-CERT"; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 892 | } |
| 893 | return "unknown"; |
| 894 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 895 | |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 896 | const char * |
Damien Miller | 1cfbfaf | 2010-03-22 05:58:24 +1100 | [diff] [blame] | 897 | key_cert_type(const Key *k) |
| 898 | { |
| 899 | switch (k->cert->type) { |
| 900 | case SSH2_CERT_TYPE_USER: |
| 901 | return "user"; |
| 902 | case SSH2_CERT_TYPE_HOST: |
| 903 | return "host"; |
| 904 | default: |
| 905 | return "unknown"; |
| 906 | } |
| 907 | } |
| 908 | |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 909 | static const char * |
| 910 | key_ssh_name_from_type_nid(int type, int nid) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 911 | { |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 912 | switch (type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 913 | case KEY_RSA: |
| 914 | return "ssh-rsa"; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 915 | case KEY_DSA: |
| 916 | return "ssh-dss"; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 917 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 918 | return "ssh-rsa-cert-v00@openssh.com"; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 919 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 920 | return "ssh-dss-cert-v00@openssh.com"; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 921 | case KEY_RSA_CERT: |
| 922 | return "ssh-rsa-cert-v01@openssh.com"; |
| 923 | case KEY_DSA_CERT: |
| 924 | return "ssh-dss-cert-v01@openssh.com"; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 925 | case KEY_ECDSA: |
| 926 | switch (nid) { |
| 927 | case NID_X9_62_prime256v1: |
| 928 | return "ecdsa-sha2-nistp256"; |
| 929 | case NID_secp384r1: |
| 930 | return "ecdsa-sha2-nistp384"; |
| 931 | case NID_secp521r1: |
| 932 | return "ecdsa-sha2-nistp521"; |
| 933 | default: |
| 934 | break; |
| 935 | } |
| 936 | break; |
| 937 | case KEY_ECDSA_CERT: |
| 938 | switch (nid) { |
| 939 | case NID_X9_62_prime256v1: |
| 940 | return "ecdsa-sha2-nistp256-cert-v01@openssh.com"; |
| 941 | case NID_secp384r1: |
| 942 | return "ecdsa-sha2-nistp384-cert-v01@openssh.com"; |
| 943 | case NID_secp521r1: |
| 944 | return "ecdsa-sha2-nistp521-cert-v01@openssh.com"; |
| 945 | default: |
| 946 | break; |
| 947 | } |
| 948 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 949 | } |
| 950 | return "ssh-unknown"; |
| 951 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 952 | |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 953 | const char * |
| 954 | key_ssh_name(const Key *k) |
| 955 | { |
| 956 | return key_ssh_name_from_type_nid(k->type, k->ecdsa_nid); |
| 957 | } |
| 958 | |
| 959 | const char * |
| 960 | key_ssh_name_plain(const Key *k) |
| 961 | { |
| 962 | return key_ssh_name_from_type_nid(key_type_plain(k->type), |
| 963 | k->ecdsa_nid); |
| 964 | } |
| 965 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 966 | u_int |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 967 | key_size(const Key *k) |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 968 | { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 969 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 970 | case KEY_RSA1: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 971 | case KEY_RSA: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 972 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 973 | case KEY_RSA_CERT: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 974 | return BN_num_bits(k->rsa->n); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 975 | case KEY_DSA: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 976 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 977 | case KEY_DSA_CERT: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 978 | return BN_num_bits(k->dsa->p); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 979 | case KEY_ECDSA: |
| 980 | case KEY_ECDSA_CERT: |
| 981 | switch (k->ecdsa_nid) { |
| 982 | case NID_X9_62_prime256v1: |
| 983 | return 256; |
| 984 | case NID_secp384r1: |
| 985 | return 384; |
| 986 | case NID_secp521r1: |
| 987 | return 521; |
| 988 | default: |
| 989 | break; |
| 990 | } |
| 991 | break; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 992 | } |
| 993 | return 0; |
| 994 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 995 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 996 | static RSA * |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 997 | rsa_generate_private_key(u_int bits) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 998 | { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 999 | RSA *private; |
Damien Miller | 69b7203 | 2006-03-26 14:02:35 +1100 | [diff] [blame] | 1000 | |
Darren Tucker | 57e0d01 | 2010-01-08 18:52:27 +1100 | [diff] [blame] | 1001 | private = RSA_generate_key(bits, RSA_F4, NULL, NULL); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1002 | if (private == NULL) |
| 1003 | fatal("rsa_generate_private_key: key generation failed."); |
| 1004 | return private; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1005 | } |
| 1006 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1007 | static DSA* |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1008 | dsa_generate_private_key(u_int bits) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1009 | { |
| 1010 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); |
Damien Miller | 69b7203 | 2006-03-26 14:02:35 +1100 | [diff] [blame] | 1011 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1012 | if (private == NULL) |
| 1013 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); |
| 1014 | if (!DSA_generate_key(private)) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1015 | fatal("dsa_generate_private_key: DSA_generate_key failed."); |
| 1016 | if (private == NULL) |
| 1017 | fatal("dsa_generate_private_key: NULL."); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1018 | return private; |
| 1019 | } |
| 1020 | |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1021 | int |
| 1022 | key_ecdsa_bits_to_nid(int bits) |
| 1023 | { |
| 1024 | switch (bits) { |
| 1025 | case 256: |
| 1026 | return NID_X9_62_prime256v1; |
| 1027 | case 384: |
| 1028 | return NID_secp384r1; |
| 1029 | case 521: |
| 1030 | return NID_secp521r1; |
| 1031 | default: |
| 1032 | return -1; |
| 1033 | } |
| 1034 | } |
| 1035 | |
| 1036 | /* |
| 1037 | * This is horrid, but OpenSSL's PEM_read_PrivateKey seems not to restore |
| 1038 | * the EC_GROUP nid when loading a key... |
| 1039 | */ |
| 1040 | int |
| 1041 | key_ecdsa_group_to_nid(const EC_GROUP *g) |
| 1042 | { |
| 1043 | EC_GROUP *eg; |
| 1044 | int nids[] = { |
| 1045 | NID_X9_62_prime256v1, |
| 1046 | NID_secp384r1, |
| 1047 | NID_secp521r1, |
| 1048 | -1 |
| 1049 | }; |
| 1050 | u_int i; |
| 1051 | BN_CTX *bnctx; |
| 1052 | |
| 1053 | if ((bnctx = BN_CTX_new()) == NULL) |
| 1054 | fatal("%s: BN_CTX_new() failed", __func__); |
| 1055 | for (i = 0; nids[i] != -1; i++) { |
| 1056 | if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) |
| 1057 | fatal("%s: EC_GROUP_new_by_curve_name failed", |
| 1058 | __func__); |
| 1059 | if (EC_GROUP_cmp(g, eg, bnctx) == 0) { |
| 1060 | EC_GROUP_free(eg); |
| 1061 | break; |
| 1062 | } |
| 1063 | EC_GROUP_free(eg); |
| 1064 | } |
| 1065 | BN_CTX_free(bnctx); |
| 1066 | debug3("%s: nid = %d", __func__, nids[i]); |
| 1067 | return nids[i]; |
| 1068 | } |
| 1069 | |
| 1070 | static EC_KEY* |
| 1071 | ecdsa_generate_private_key(u_int bits, int *nid) |
| 1072 | { |
| 1073 | EC_KEY *private; |
| 1074 | |
| 1075 | if ((*nid = key_ecdsa_bits_to_nid(bits)) == -1) |
| 1076 | fatal("%s: invalid key length", __func__); |
| 1077 | if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) |
| 1078 | fatal("%s: EC_KEY_new_by_curve_name failed", __func__); |
| 1079 | if (EC_KEY_generate_key(private) != 1) |
| 1080 | fatal("%s: EC_KEY_generate_key failed", __func__); |
| 1081 | return private; |
| 1082 | } |
| 1083 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1084 | Key * |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1085 | key_generate(int type, u_int bits) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1086 | { |
| 1087 | Key *k = key_new(KEY_UNSPEC); |
| 1088 | switch (type) { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1089 | case KEY_DSA: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1090 | k->dsa = dsa_generate_private_key(bits); |
| 1091 | break; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1092 | case KEY_ECDSA: |
| 1093 | k->ecdsa = ecdsa_generate_private_key(bits, &k->ecdsa_nid); |
| 1094 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1095 | case KEY_RSA: |
| 1096 | case KEY_RSA1: |
| 1097 | k->rsa = rsa_generate_private_key(bits); |
| 1098 | break; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1099 | case KEY_RSA_CERT_V00: |
| 1100 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1101 | case KEY_RSA_CERT: |
| 1102 | case KEY_DSA_CERT: |
| 1103 | fatal("key_generate: cert keys cannot be generated directly"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1104 | default: |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1105 | fatal("key_generate: unknown type %d", type); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1106 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1107 | k->type = type; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1108 | return k; |
| 1109 | } |
| 1110 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1111 | void |
| 1112 | key_cert_copy(const Key *from_key, struct Key *to_key) |
| 1113 | { |
| 1114 | u_int i; |
| 1115 | const struct KeyCert *from; |
| 1116 | struct KeyCert *to; |
| 1117 | |
| 1118 | if (to_key->cert != NULL) { |
| 1119 | cert_free(to_key->cert); |
| 1120 | to_key->cert = NULL; |
| 1121 | } |
| 1122 | |
| 1123 | if ((from = from_key->cert) == NULL) |
| 1124 | return; |
| 1125 | |
| 1126 | to = to_key->cert = cert_new(); |
| 1127 | |
| 1128 | buffer_append(&to->certblob, buffer_ptr(&from->certblob), |
| 1129 | buffer_len(&from->certblob)); |
| 1130 | |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1131 | buffer_append(&to->critical, |
| 1132 | buffer_ptr(&from->critical), buffer_len(&from->critical)); |
| 1133 | buffer_append(&to->extensions, |
| 1134 | buffer_ptr(&from->extensions), buffer_len(&from->extensions)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1135 | |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1136 | to->serial = from->serial; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1137 | to->type = from->type; |
| 1138 | to->key_id = from->key_id == NULL ? NULL : xstrdup(from->key_id); |
| 1139 | to->valid_after = from->valid_after; |
| 1140 | to->valid_before = from->valid_before; |
| 1141 | to->signature_key = from->signature_key == NULL ? |
| 1142 | NULL : key_from_private(from->signature_key); |
| 1143 | |
| 1144 | to->nprincipals = from->nprincipals; |
| 1145 | if (to->nprincipals > CERT_MAX_PRINCIPALS) |
| 1146 | fatal("%s: nprincipals (%u) > CERT_MAX_PRINCIPALS (%u)", |
| 1147 | __func__, to->nprincipals, CERT_MAX_PRINCIPALS); |
| 1148 | if (to->nprincipals > 0) { |
| 1149 | to->principals = xcalloc(from->nprincipals, |
| 1150 | sizeof(*to->principals)); |
| 1151 | for (i = 0; i < to->nprincipals; i++) |
| 1152 | to->principals[i] = xstrdup(from->principals[i]); |
| 1153 | } |
| 1154 | } |
| 1155 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1156 | Key * |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1157 | key_from_private(const Key *k) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1158 | { |
| 1159 | Key *n = NULL; |
| 1160 | switch (k->type) { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1161 | case KEY_DSA: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1162 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1163 | case KEY_DSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1164 | n = key_new(k->type); |
Darren Tucker | 0bc8557 | 2006-11-07 23:14:41 +1100 | [diff] [blame] | 1165 | if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) || |
| 1166 | (BN_copy(n->dsa->q, k->dsa->q) == NULL) || |
| 1167 | (BN_copy(n->dsa->g, k->dsa->g) == NULL) || |
| 1168 | (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) |
| 1169 | fatal("key_from_private: BN_copy failed"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1170 | break; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1171 | case KEY_ECDSA: |
| 1172 | case KEY_ECDSA_CERT: |
| 1173 | n = key_new(k->type); |
| 1174 | n->ecdsa_nid = k->ecdsa_nid; |
| 1175 | if ((n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid)) == NULL) |
| 1176 | fatal("%s: EC_KEY_new_by_curve_name failed", __func__); |
| 1177 | if (EC_KEY_set_public_key(n->ecdsa, |
| 1178 | EC_KEY_get0_public_key(k->ecdsa)) != 1) |
| 1179 | fatal("%s: EC_KEY_set_public_key failed", __func__); |
| 1180 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1181 | case KEY_RSA: |
| 1182 | case KEY_RSA1: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1183 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1184 | case KEY_RSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1185 | n = key_new(k->type); |
Darren Tucker | 0bc8557 | 2006-11-07 23:14:41 +1100 | [diff] [blame] | 1186 | if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) || |
| 1187 | (BN_copy(n->rsa->e, k->rsa->e) == NULL)) |
| 1188 | fatal("key_from_private: BN_copy failed"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1189 | break; |
| 1190 | default: |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1191 | fatal("key_from_private: unknown type %d", k->type); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1192 | break; |
| 1193 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1194 | if (key_is_cert(k)) |
| 1195 | key_cert_copy(k, n); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1196 | return n; |
| 1197 | } |
| 1198 | |
| 1199 | int |
| 1200 | key_type_from_name(char *name) |
| 1201 | { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1202 | if (strcmp(name, "rsa1") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1203 | return KEY_RSA1; |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1204 | } else if (strcmp(name, "rsa") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1205 | return KEY_RSA; |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1206 | } else if (strcmp(name, "dsa") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1207 | return KEY_DSA; |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1208 | } else if (strcmp(name, "ssh-rsa") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1209 | return KEY_RSA; |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1210 | } else if (strcmp(name, "ssh-dss") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1211 | return KEY_DSA; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1212 | } else if (strcmp(name, "ecdsa") == 0 || |
| 1213 | strcmp(name, "ecdsa-sha2-nistp256") == 0 || |
| 1214 | strcmp(name, "ecdsa-sha2-nistp384") == 0 || |
| 1215 | strcmp(name, "ecdsa-sha2-nistp521") == 0) { |
| 1216 | return KEY_ECDSA; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1217 | } else if (strcmp(name, "ssh-rsa-cert-v00@openssh.com") == 0) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1218 | return KEY_RSA_CERT_V00; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1219 | } else if (strcmp(name, "ssh-dss-cert-v00@openssh.com") == 0) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1220 | return KEY_DSA_CERT_V00; |
| 1221 | } else if (strcmp(name, "ssh-rsa-cert-v01@openssh.com") == 0) { |
| 1222 | return KEY_RSA_CERT; |
| 1223 | } else if (strcmp(name, "ssh-dss-cert-v01@openssh.com") == 0) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1224 | return KEY_DSA_CERT; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1225 | } else if (strcmp(name, "ecdsa-sha2-nistp256-cert-v01@openssh.com") == 0 || |
| 1226 | strcmp(name, "ecdsa-sha2-nistp384-cert-v01@openssh.com") == 0 || |
| 1227 | strcmp(name, "ecdsa-sha2-nistp521-cert-v01@openssh.com") == 0) |
| 1228 | return KEY_ECDSA_CERT; |
| 1229 | |
Ben Lindstrom | b54873a | 2001-03-11 20:01:55 +0000 | [diff] [blame] | 1230 | debug2("key_type_from_name: unknown key type '%s'", name); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1231 | return KEY_UNSPEC; |
| 1232 | } |
| 1233 | |
Ben Lindstrom | 982dbbc | 2001-04-17 18:11:36 +0000 | [diff] [blame] | 1234 | int |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1235 | key_ecdsa_nid_from_name(const char *name) |
| 1236 | { |
| 1237 | if (strcmp(name, "ecdsa-sha2-nistp256") == 0 || |
| 1238 | strcmp(name, "ecdsa-sha2-nistp256-cert-v01@openssh.com") == 0) |
| 1239 | return NID_X9_62_prime256v1; |
| 1240 | if (strcmp(name, "ecdsa-sha2-nistp384") == 0 || |
| 1241 | strcmp(name, "ecdsa-sha2-nistp384-cert-v01@openssh.com") == 0) |
| 1242 | return NID_secp384r1; |
| 1243 | if (strcmp(name, "ecdsa-sha2-nistp521") == 0 || |
| 1244 | strcmp(name, "ecdsa-sha2-nistp521-cert-v01@openssh.com") == 0) |
| 1245 | return NID_secp521r1; |
| 1246 | |
| 1247 | debug2("%s: unknown/non-ECDSA key type '%s'", __func__, name); |
| 1248 | return -1; |
| 1249 | } |
| 1250 | |
| 1251 | int |
Ben Lindstrom | 982dbbc | 2001-04-17 18:11:36 +0000 | [diff] [blame] | 1252 | key_names_valid2(const char *names) |
| 1253 | { |
| 1254 | char *s, *cp, *p; |
| 1255 | |
| 1256 | if (names == NULL || strcmp(names, "") == 0) |
| 1257 | return 0; |
| 1258 | s = cp = xstrdup(names); |
| 1259 | for ((p = strsep(&cp, ",")); p && *p != '\0'; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1260 | (p = strsep(&cp, ","))) { |
Ben Lindstrom | 982dbbc | 2001-04-17 18:11:36 +0000 | [diff] [blame] | 1261 | switch (key_type_from_name(p)) { |
| 1262 | case KEY_RSA1: |
| 1263 | case KEY_UNSPEC: |
| 1264 | xfree(s); |
| 1265 | return 0; |
| 1266 | } |
| 1267 | } |
| 1268 | debug3("key names ok: [%s]", names); |
| 1269 | xfree(s); |
| 1270 | return 1; |
| 1271 | } |
| 1272 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1273 | static int |
| 1274 | cert_parse(Buffer *b, Key *key, const u_char *blob, u_int blen) |
| 1275 | { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1276 | u_char *principals, *critical, *exts, *sig_key, *sig; |
| 1277 | u_int signed_len, plen, clen, sklen, slen, kidlen, elen; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1278 | Buffer tmp; |
| 1279 | char *principal; |
| 1280 | int ret = -1; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1281 | int v00 = key->type == KEY_DSA_CERT_V00 || |
| 1282 | key->type == KEY_RSA_CERT_V00; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1283 | |
| 1284 | buffer_init(&tmp); |
| 1285 | |
| 1286 | /* Copy the entire key blob for verification and later serialisation */ |
| 1287 | buffer_append(&key->cert->certblob, blob, blen); |
| 1288 | |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1289 | elen = 0; /* Not touched for v00 certs */ |
| 1290 | principals = exts = critical = sig_key = sig = NULL; |
| 1291 | if ((!v00 && buffer_get_int64_ret(&key->cert->serial, b) != 0) || |
| 1292 | buffer_get_int_ret(&key->cert->type, b) != 0 || |
Damien Miller | da108ec | 2010-08-31 22:36:39 +1000 | [diff] [blame] | 1293 | (key->cert->key_id = buffer_get_cstring_ret(b, &kidlen)) == NULL || |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1294 | (principals = buffer_get_string_ret(b, &plen)) == NULL || |
| 1295 | buffer_get_int64_ret(&key->cert->valid_after, b) != 0 || |
| 1296 | buffer_get_int64_ret(&key->cert->valid_before, b) != 0 || |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1297 | (critical = buffer_get_string_ret(b, &clen)) == NULL || |
| 1298 | (!v00 && (exts = buffer_get_string_ret(b, &elen)) == NULL) || |
| 1299 | (v00 && buffer_get_string_ptr_ret(b, NULL) == NULL) || /* nonce */ |
| 1300 | buffer_get_string_ptr_ret(b, NULL) == NULL || /* reserved */ |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1301 | (sig_key = buffer_get_string_ret(b, &sklen)) == NULL) { |
| 1302 | error("%s: parse error", __func__); |
| 1303 | goto out; |
| 1304 | } |
| 1305 | |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1306 | if (kidlen != strlen(key->cert->key_id)) { |
| 1307 | error("%s: key ID contains \\0 character", __func__); |
| 1308 | goto out; |
| 1309 | } |
| 1310 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1311 | /* Signature is left in the buffer so we can calculate this length */ |
| 1312 | signed_len = buffer_len(&key->cert->certblob) - buffer_len(b); |
| 1313 | |
| 1314 | if ((sig = buffer_get_string_ret(b, &slen)) == NULL) { |
| 1315 | error("%s: parse error", __func__); |
| 1316 | goto out; |
| 1317 | } |
| 1318 | |
| 1319 | if (key->cert->type != SSH2_CERT_TYPE_USER && |
| 1320 | key->cert->type != SSH2_CERT_TYPE_HOST) { |
| 1321 | error("Unknown certificate type %u", key->cert->type); |
| 1322 | goto out; |
| 1323 | } |
| 1324 | |
| 1325 | buffer_append(&tmp, principals, plen); |
| 1326 | while (buffer_len(&tmp) > 0) { |
| 1327 | if (key->cert->nprincipals >= CERT_MAX_PRINCIPALS) { |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1328 | error("%s: Too many principals", __func__); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1329 | goto out; |
| 1330 | } |
Damien Miller | da108ec | 2010-08-31 22:36:39 +1000 | [diff] [blame] | 1331 | if ((principal = buffer_get_cstring_ret(&tmp, &plen)) == NULL) { |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1332 | error("%s: Principals data invalid", __func__); |
| 1333 | goto out; |
| 1334 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1335 | key->cert->principals = xrealloc(key->cert->principals, |
| 1336 | key->cert->nprincipals + 1, sizeof(*key->cert->principals)); |
| 1337 | key->cert->principals[key->cert->nprincipals++] = principal; |
| 1338 | } |
| 1339 | |
| 1340 | buffer_clear(&tmp); |
| 1341 | |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1342 | buffer_append(&key->cert->critical, critical, clen); |
| 1343 | buffer_append(&tmp, critical, clen); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1344 | /* validate structure */ |
| 1345 | while (buffer_len(&tmp) != 0) { |
Damien Miller | 2befbad | 2010-03-04 21:52:18 +1100 | [diff] [blame] | 1346 | if (buffer_get_string_ptr_ret(&tmp, NULL) == NULL || |
| 1347 | buffer_get_string_ptr_ret(&tmp, NULL) == NULL) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1348 | error("%s: critical option data invalid", __func__); |
| 1349 | goto out; |
| 1350 | } |
| 1351 | } |
| 1352 | buffer_clear(&tmp); |
| 1353 | |
| 1354 | buffer_append(&key->cert->extensions, exts, elen); |
| 1355 | buffer_append(&tmp, exts, elen); |
| 1356 | /* validate structure */ |
| 1357 | while (buffer_len(&tmp) != 0) { |
| 1358 | if (buffer_get_string_ptr_ret(&tmp, NULL) == NULL || |
| 1359 | buffer_get_string_ptr_ret(&tmp, NULL) == NULL) { |
| 1360 | error("%s: extension data invalid", __func__); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1361 | goto out; |
| 1362 | } |
| 1363 | } |
| 1364 | buffer_clear(&tmp); |
| 1365 | |
| 1366 | if ((key->cert->signature_key = key_from_blob(sig_key, |
| 1367 | sklen)) == NULL) { |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1368 | error("%s: Signature key invalid", __func__); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1369 | goto out; |
| 1370 | } |
| 1371 | if (key->cert->signature_key->type != KEY_RSA && |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1372 | key->cert->signature_key->type != KEY_DSA && |
| 1373 | key->cert->signature_key->type != KEY_ECDSA) { |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1374 | error("%s: Invalid signature key type %s (%d)", __func__, |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1375 | key_type(key->cert->signature_key), |
| 1376 | key->cert->signature_key->type); |
| 1377 | goto out; |
| 1378 | } |
| 1379 | |
| 1380 | switch (key_verify(key->cert->signature_key, sig, slen, |
| 1381 | buffer_ptr(&key->cert->certblob), signed_len)) { |
| 1382 | case 1: |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1383 | ret = 0; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1384 | break; /* Good signature */ |
| 1385 | case 0: |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1386 | error("%s: Invalid signature on certificate", __func__); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1387 | goto out; |
| 1388 | case -1: |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1389 | error("%s: Certificate signature verification failed", |
| 1390 | __func__); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1391 | goto out; |
| 1392 | } |
| 1393 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1394 | out: |
| 1395 | buffer_free(&tmp); |
| 1396 | if (principals != NULL) |
| 1397 | xfree(principals); |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1398 | if (critical != NULL) |
| 1399 | xfree(critical); |
| 1400 | if (exts != NULL) |
| 1401 | xfree(exts); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1402 | if (sig_key != NULL) |
| 1403 | xfree(sig_key); |
| 1404 | if (sig != NULL) |
| 1405 | xfree(sig); |
| 1406 | return ret; |
| 1407 | } |
| 1408 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1409 | Key * |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1410 | key_from_blob(const u_char *blob, u_int blen) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1411 | { |
| 1412 | Buffer b; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1413 | int rlen, type, nid = -1; |
| 1414 | char *ktype = NULL, *curve = NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1415 | Key *key = NULL; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1416 | EC_POINT *q = NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1417 | |
| 1418 | #ifdef DEBUG_PK |
| 1419 | dump_base64(stderr, blob, blen); |
| 1420 | #endif |
| 1421 | buffer_init(&b); |
| 1422 | buffer_append(&b, blob, blen); |
Damien Miller | da108ec | 2010-08-31 22:36:39 +1000 | [diff] [blame] | 1423 | if ((ktype = buffer_get_cstring_ret(&b, NULL)) == NULL) { |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1424 | error("key_from_blob: can't read key type"); |
| 1425 | goto out; |
| 1426 | } |
| 1427 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1428 | type = key_type_from_name(ktype); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1429 | if (key_type_plain(type) == KEY_ECDSA) |
| 1430 | nid = key_ecdsa_nid_from_name(ktype); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1431 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1432 | switch (type) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1433 | case KEY_RSA_CERT: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1434 | (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */ |
| 1435 | /* FALLTHROUGH */ |
| 1436 | case KEY_RSA: |
| 1437 | case KEY_RSA_CERT_V00: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1438 | key = key_new(type); |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1439 | if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 || |
| 1440 | buffer_get_bignum2_ret(&b, key->rsa->n) == -1) { |
| 1441 | error("key_from_blob: can't read rsa key"); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1442 | badkey: |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1443 | key_free(key); |
| 1444 | key = NULL; |
| 1445 | goto out; |
| 1446 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1447 | #ifdef DEBUG_PK |
| 1448 | RSA_print_fp(stderr, key->rsa, 8); |
| 1449 | #endif |
| 1450 | break; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1451 | case KEY_DSA_CERT: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1452 | (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */ |
| 1453 | /* FALLTHROUGH */ |
| 1454 | case KEY_DSA: |
| 1455 | case KEY_DSA_CERT_V00: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1456 | key = key_new(type); |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1457 | if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 || |
| 1458 | buffer_get_bignum2_ret(&b, key->dsa->q) == -1 || |
| 1459 | buffer_get_bignum2_ret(&b, key->dsa->g) == -1 || |
| 1460 | buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) { |
| 1461 | error("key_from_blob: can't read dsa key"); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1462 | goto badkey; |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1463 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1464 | #ifdef DEBUG_PK |
| 1465 | DSA_print_fp(stderr, key->dsa, 8); |
| 1466 | #endif |
| 1467 | break; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1468 | case KEY_ECDSA_CERT: |
| 1469 | (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */ |
| 1470 | /* FALLTHROUGH */ |
| 1471 | case KEY_ECDSA: |
| 1472 | key = key_new(type); |
| 1473 | key->ecdsa_nid = nid; |
| 1474 | if ((curve = buffer_get_string_ret(&b, NULL)) == NULL) { |
| 1475 | error("key_from_blob: can't read ecdsa curve"); |
| 1476 | goto badkey; |
| 1477 | } |
| 1478 | if (key->ecdsa_nid != key_curve_name_to_nid(curve)) { |
| 1479 | error("key_from_blob: ecdsa curve doesn't match type"); |
| 1480 | goto badkey; |
| 1481 | } |
| 1482 | if (key->ecdsa != NULL) |
| 1483 | EC_KEY_free(key->ecdsa); |
| 1484 | if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid)) |
| 1485 | == NULL) |
| 1486 | fatal("key_from_blob: EC_KEY_new_by_curve_name failed"); |
| 1487 | if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) |
| 1488 | fatal("key_from_blob: EC_POINT_new failed"); |
| 1489 | if (buffer_get_ecpoint_ret(&b, EC_KEY_get0_group(key->ecdsa), |
| 1490 | q) == -1) { |
| 1491 | error("key_from_blob: can't read ecdsa key point"); |
| 1492 | goto badkey; |
| 1493 | } |
| 1494 | if (key_ec_validate_public(EC_KEY_get0_group(key->ecdsa), |
| 1495 | q) != 0) |
| 1496 | goto badkey; |
| 1497 | if (EC_KEY_set_public_key(key->ecdsa, q) != 1) |
| 1498 | fatal("key_from_blob: EC_KEY_set_public_key failed"); |
| 1499 | #ifdef DEBUG_PK |
| 1500 | key_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q); |
| 1501 | #endif |
| 1502 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1503 | case KEY_UNSPEC: |
| 1504 | key = key_new(type); |
| 1505 | break; |
| 1506 | default: |
| 1507 | error("key_from_blob: cannot handle type %s", ktype); |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1508 | goto out; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1509 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1510 | if (key_is_cert(key) && cert_parse(&b, key, blob, blen) == -1) { |
| 1511 | error("key_from_blob: can't parse cert data"); |
| 1512 | goto badkey; |
| 1513 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1514 | rlen = buffer_len(&b); |
| 1515 | if (key != NULL && rlen != 0) |
| 1516 | error("key_from_blob: remaining bytes in key blob %d", rlen); |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1517 | out: |
| 1518 | if (ktype != NULL) |
| 1519 | xfree(ktype); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1520 | if (curve != NULL) |
| 1521 | xfree(curve); |
| 1522 | if (q != NULL) |
| 1523 | EC_POINT_free(q); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1524 | buffer_free(&b); |
| 1525 | return key; |
| 1526 | } |
| 1527 | |
| 1528 | int |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1529 | key_to_blob(const Key *key, u_char **blobp, u_int *lenp) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1530 | { |
| 1531 | Buffer b; |
| 1532 | int len; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1533 | |
| 1534 | if (key == NULL) { |
| 1535 | error("key_to_blob: key == NULL"); |
| 1536 | return 0; |
| 1537 | } |
| 1538 | buffer_init(&b); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1539 | switch (key->type) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1540 | case KEY_DSA_CERT_V00: |
| 1541 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1542 | case KEY_DSA_CERT: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1543 | case KEY_ECDSA_CERT: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1544 | case KEY_RSA_CERT: |
| 1545 | /* Use the existing blob */ |
| 1546 | buffer_append(&b, buffer_ptr(&key->cert->certblob), |
| 1547 | buffer_len(&key->cert->certblob)); |
| 1548 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1549 | case KEY_DSA: |
| 1550 | buffer_put_cstring(&b, key_ssh_name(key)); |
| 1551 | buffer_put_bignum2(&b, key->dsa->p); |
| 1552 | buffer_put_bignum2(&b, key->dsa->q); |
| 1553 | buffer_put_bignum2(&b, key->dsa->g); |
| 1554 | buffer_put_bignum2(&b, key->dsa->pub_key); |
| 1555 | break; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1556 | case KEY_ECDSA: |
| 1557 | buffer_put_cstring(&b, key_ssh_name(key)); |
| 1558 | buffer_put_cstring(&b, key_curve_nid_to_name(key->ecdsa_nid)); |
| 1559 | buffer_put_ecpoint(&b, EC_KEY_get0_group(key->ecdsa), |
| 1560 | EC_KEY_get0_public_key(key->ecdsa)); |
| 1561 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1562 | case KEY_RSA: |
| 1563 | buffer_put_cstring(&b, key_ssh_name(key)); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1564 | buffer_put_bignum2(&b, key->rsa->e); |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1565 | buffer_put_bignum2(&b, key->rsa->n); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1566 | break; |
| 1567 | default: |
Ben Lindstrom | 99a30f1 | 2001-09-18 05:49:14 +0000 | [diff] [blame] | 1568 | error("key_to_blob: unsupported key type %d", key->type); |
| 1569 | buffer_free(&b); |
| 1570 | return 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1571 | } |
| 1572 | len = buffer_len(&b); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1573 | if (lenp != NULL) |
| 1574 | *lenp = len; |
Ben Lindstrom | 2bf759c | 2002-07-07 22:13:31 +0000 | [diff] [blame] | 1575 | if (blobp != NULL) { |
| 1576 | *blobp = xmalloc(len); |
| 1577 | memcpy(*blobp, buffer_ptr(&b), len); |
| 1578 | } |
| 1579 | memset(buffer_ptr(&b), 0, len); |
| 1580 | buffer_free(&b); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1581 | return len; |
| 1582 | } |
| 1583 | |
| 1584 | int |
| 1585 | key_sign( |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1586 | const Key *key, |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 1587 | u_char **sigp, u_int *lenp, |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1588 | const u_char *data, u_int datalen) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1589 | { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1590 | switch (key->type) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1591 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1592 | case KEY_DSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1593 | case KEY_DSA: |
| 1594 | return ssh_dss_sign(key, sigp, lenp, data, datalen); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1595 | case KEY_ECDSA_CERT: |
| 1596 | case KEY_ECDSA: |
| 1597 | return ssh_ecdsa_sign(key, sigp, lenp, data, datalen); |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1598 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1599 | case KEY_RSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1600 | case KEY_RSA: |
| 1601 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1602 | default: |
Darren Tucker | 5cb30ad | 2004-08-12 22:40:24 +1000 | [diff] [blame] | 1603 | error("key_sign: invalid key type %d", key->type); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1604 | return -1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1605 | } |
| 1606 | } |
| 1607 | |
Ben Lindstrom | 01fff0c | 2002-06-06 20:54:07 +0000 | [diff] [blame] | 1608 | /* |
| 1609 | * key_verify returns 1 for a correct signature, 0 for an incorrect signature |
| 1610 | * and -1 on error. |
| 1611 | */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1612 | int |
| 1613 | key_verify( |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1614 | const Key *key, |
| 1615 | const u_char *signature, u_int signaturelen, |
| 1616 | const u_char *data, u_int datalen) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1617 | { |
Ben Lindstrom | 5363aee | 2001-06-25 04:42:20 +0000 | [diff] [blame] | 1618 | if (signaturelen == 0) |
| 1619 | return -1; |
| 1620 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1621 | switch (key->type) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1622 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1623 | case KEY_DSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1624 | case KEY_DSA: |
| 1625 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1626 | case KEY_ECDSA_CERT: |
| 1627 | case KEY_ECDSA: |
| 1628 | return ssh_ecdsa_verify(key, signature, signaturelen, data, datalen); |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1629 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1630 | case KEY_RSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1631 | case KEY_RSA: |
| 1632 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1633 | default: |
Darren Tucker | 5cb30ad | 2004-08-12 22:40:24 +1000 | [diff] [blame] | 1634 | error("key_verify: invalid key type %d", key->type); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1635 | return -1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1636 | } |
| 1637 | } |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1638 | |
| 1639 | /* Converts a private to a public key */ |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1640 | Key * |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1641 | key_demote(const Key *k) |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1642 | { |
| 1643 | Key *pk; |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 1644 | |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 1645 | pk = xcalloc(1, sizeof(*pk)); |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1646 | pk->type = k->type; |
| 1647 | pk->flags = k->flags; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1648 | pk->ecdsa_nid = k->ecdsa_nid; |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1649 | pk->dsa = NULL; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1650 | pk->ecdsa = NULL; |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1651 | pk->rsa = NULL; |
| 1652 | |
| 1653 | switch (k->type) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1654 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1655 | case KEY_RSA_CERT: |
| 1656 | key_cert_copy(k, pk); |
| 1657 | /* FALLTHROUGH */ |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1658 | case KEY_RSA1: |
| 1659 | case KEY_RSA: |
| 1660 | if ((pk->rsa = RSA_new()) == NULL) |
| 1661 | fatal("key_demote: RSA_new failed"); |
| 1662 | if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL) |
| 1663 | fatal("key_demote: BN_dup failed"); |
| 1664 | if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL) |
| 1665 | fatal("key_demote: BN_dup failed"); |
| 1666 | break; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1667 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1668 | case KEY_DSA_CERT: |
| 1669 | key_cert_copy(k, pk); |
| 1670 | /* FALLTHROUGH */ |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1671 | case KEY_DSA: |
| 1672 | if ((pk->dsa = DSA_new()) == NULL) |
| 1673 | fatal("key_demote: DSA_new failed"); |
| 1674 | if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL) |
| 1675 | fatal("key_demote: BN_dup failed"); |
| 1676 | if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL) |
| 1677 | fatal("key_demote: BN_dup failed"); |
| 1678 | if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL) |
| 1679 | fatal("key_demote: BN_dup failed"); |
| 1680 | if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) |
| 1681 | fatal("key_demote: BN_dup failed"); |
| 1682 | break; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1683 | case KEY_ECDSA_CERT: |
| 1684 | key_cert_copy(k, pk); |
| 1685 | /* FALLTHROUGH */ |
| 1686 | case KEY_ECDSA: |
| 1687 | if ((pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid)) == NULL) |
| 1688 | fatal("key_demote: EC_KEY_new_by_curve_name failed"); |
| 1689 | if (EC_KEY_set_public_key(pk->ecdsa, |
| 1690 | EC_KEY_get0_public_key(k->ecdsa)) != 1) |
| 1691 | fatal("key_demote: EC_KEY_set_public_key failed"); |
| 1692 | break; |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1693 | default: |
| 1694 | fatal("key_free: bad key type %d", k->type); |
| 1695 | break; |
| 1696 | } |
| 1697 | |
| 1698 | return (pk); |
| 1699 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1700 | |
| 1701 | int |
| 1702 | key_is_cert(const Key *k) |
| 1703 | { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1704 | if (k == NULL) |
| 1705 | return 0; |
| 1706 | switch (k->type) { |
| 1707 | case KEY_RSA_CERT_V00: |
| 1708 | case KEY_DSA_CERT_V00: |
| 1709 | case KEY_RSA_CERT: |
| 1710 | case KEY_DSA_CERT: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1711 | case KEY_ECDSA_CERT: |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1712 | return 1; |
| 1713 | default: |
| 1714 | return 0; |
| 1715 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1716 | } |
| 1717 | |
| 1718 | /* Return the cert-less equivalent to a certified key type */ |
| 1719 | int |
| 1720 | key_type_plain(int type) |
| 1721 | { |
| 1722 | switch (type) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1723 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1724 | case KEY_RSA_CERT: |
| 1725 | return KEY_RSA; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1726 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1727 | case KEY_DSA_CERT: |
| 1728 | return KEY_DSA; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1729 | case KEY_ECDSA_CERT: |
| 1730 | return KEY_ECDSA; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1731 | default: |
| 1732 | return type; |
| 1733 | } |
| 1734 | } |
| 1735 | |
| 1736 | /* Convert a KEY_RSA or KEY_DSA to their _CERT equivalent */ |
| 1737 | int |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1738 | key_to_certified(Key *k, int legacy) |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1739 | { |
| 1740 | switch (k->type) { |
| 1741 | case KEY_RSA: |
| 1742 | k->cert = cert_new(); |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1743 | k->type = legacy ? KEY_RSA_CERT_V00 : KEY_RSA_CERT; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1744 | return 0; |
| 1745 | case KEY_DSA: |
| 1746 | k->cert = cert_new(); |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1747 | k->type = legacy ? KEY_DSA_CERT_V00 : KEY_DSA_CERT; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1748 | return 0; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1749 | case KEY_ECDSA: |
| 1750 | k->cert = cert_new(); |
| 1751 | k->type = KEY_ECDSA_CERT; |
| 1752 | return 0; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1753 | default: |
| 1754 | error("%s: key has incorrect type %s", __func__, key_type(k)); |
| 1755 | return -1; |
| 1756 | } |
| 1757 | } |
| 1758 | |
| 1759 | /* Convert a KEY_RSA_CERT or KEY_DSA_CERT to their raw key equivalent */ |
| 1760 | int |
| 1761 | key_drop_cert(Key *k) |
| 1762 | { |
| 1763 | switch (k->type) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1764 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1765 | case KEY_RSA_CERT: |
| 1766 | cert_free(k->cert); |
| 1767 | k->type = KEY_RSA; |
| 1768 | return 0; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1769 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1770 | case KEY_DSA_CERT: |
| 1771 | cert_free(k->cert); |
| 1772 | k->type = KEY_DSA; |
| 1773 | return 0; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1774 | case KEY_ECDSA_CERT: |
| 1775 | cert_free(k->cert); |
| 1776 | k->type = KEY_ECDSA; |
| 1777 | return 0; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1778 | default: |
| 1779 | error("%s: key has incorrect type %s", __func__, key_type(k)); |
| 1780 | return -1; |
| 1781 | } |
| 1782 | } |
| 1783 | |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1784 | /* |
| 1785 | * Sign a KEY_RSA_CERT, KEY_DSA_CERT or KEY_ECDSA_CERT, (re-)generating |
| 1786 | * the signed certblob |
| 1787 | */ |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1788 | int |
| 1789 | key_certify(Key *k, Key *ca) |
| 1790 | { |
| 1791 | Buffer principals; |
| 1792 | u_char *ca_blob, *sig_blob, nonce[32]; |
| 1793 | u_int i, ca_len, sig_len; |
| 1794 | |
| 1795 | if (k->cert == NULL) { |
| 1796 | error("%s: key lacks cert info", __func__); |
| 1797 | return -1; |
| 1798 | } |
| 1799 | |
| 1800 | if (!key_is_cert(k)) { |
| 1801 | error("%s: certificate has unknown type %d", __func__, |
| 1802 | k->cert->type); |
| 1803 | return -1; |
| 1804 | } |
| 1805 | |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1806 | if (ca->type != KEY_RSA && ca->type != KEY_DSA && |
| 1807 | ca->type != KEY_ECDSA) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1808 | error("%s: CA key has unsupported type %s", __func__, |
| 1809 | key_type(ca)); |
| 1810 | return -1; |
| 1811 | } |
| 1812 | |
| 1813 | key_to_blob(ca, &ca_blob, &ca_len); |
| 1814 | |
| 1815 | buffer_clear(&k->cert->certblob); |
| 1816 | buffer_put_cstring(&k->cert->certblob, key_ssh_name(k)); |
| 1817 | |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1818 | /* -v01 certs put nonce first */ |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1819 | if (!key_cert_is_legacy(k)) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1820 | arc4random_buf(&nonce, sizeof(nonce)); |
| 1821 | buffer_put_string(&k->cert->certblob, nonce, sizeof(nonce)); |
| 1822 | } |
| 1823 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1824 | switch (k->type) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1825 | case KEY_DSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1826 | case KEY_DSA_CERT: |
| 1827 | buffer_put_bignum2(&k->cert->certblob, k->dsa->p); |
| 1828 | buffer_put_bignum2(&k->cert->certblob, k->dsa->q); |
| 1829 | buffer_put_bignum2(&k->cert->certblob, k->dsa->g); |
| 1830 | buffer_put_bignum2(&k->cert->certblob, k->dsa->pub_key); |
| 1831 | break; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1832 | case KEY_ECDSA_CERT: |
| 1833 | buffer_put_cstring(&k->cert->certblob, |
| 1834 | key_curve_nid_to_name(k->ecdsa_nid)); |
| 1835 | buffer_put_ecpoint(&k->cert->certblob, |
| 1836 | EC_KEY_get0_group(k->ecdsa), |
| 1837 | EC_KEY_get0_public_key(k->ecdsa)); |
| 1838 | break; |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1839 | case KEY_RSA_CERT_V00: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1840 | case KEY_RSA_CERT: |
| 1841 | buffer_put_bignum2(&k->cert->certblob, k->rsa->e); |
| 1842 | buffer_put_bignum2(&k->cert->certblob, k->rsa->n); |
| 1843 | break; |
| 1844 | default: |
| 1845 | error("%s: key has incorrect type %s", __func__, key_type(k)); |
| 1846 | buffer_clear(&k->cert->certblob); |
| 1847 | xfree(ca_blob); |
| 1848 | return -1; |
| 1849 | } |
| 1850 | |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1851 | /* -v01 certs have a serial number next */ |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1852 | if (!key_cert_is_legacy(k)) |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1853 | buffer_put_int64(&k->cert->certblob, k->cert->serial); |
| 1854 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1855 | buffer_put_int(&k->cert->certblob, k->cert->type); |
| 1856 | buffer_put_cstring(&k->cert->certblob, k->cert->key_id); |
| 1857 | |
| 1858 | buffer_init(&principals); |
| 1859 | for (i = 0; i < k->cert->nprincipals; i++) |
| 1860 | buffer_put_cstring(&principals, k->cert->principals[i]); |
| 1861 | buffer_put_string(&k->cert->certblob, buffer_ptr(&principals), |
| 1862 | buffer_len(&principals)); |
| 1863 | buffer_free(&principals); |
| 1864 | |
| 1865 | buffer_put_int64(&k->cert->certblob, k->cert->valid_after); |
| 1866 | buffer_put_int64(&k->cert->certblob, k->cert->valid_before); |
| 1867 | buffer_put_string(&k->cert->certblob, |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1868 | buffer_ptr(&k->cert->critical), buffer_len(&k->cert->critical)); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1869 | |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1870 | /* -v01 certs have non-critical options here */ |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1871 | if (!key_cert_is_legacy(k)) { |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1872 | buffer_put_string(&k->cert->certblob, |
| 1873 | buffer_ptr(&k->cert->extensions), |
| 1874 | buffer_len(&k->cert->extensions)); |
| 1875 | } |
| 1876 | |
| 1877 | /* -v00 certs put the nonce at the end */ |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1878 | if (key_cert_is_legacy(k)) |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1879 | buffer_put_string(&k->cert->certblob, nonce, sizeof(nonce)); |
| 1880 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1881 | buffer_put_string(&k->cert->certblob, NULL, 0); /* reserved */ |
| 1882 | buffer_put_string(&k->cert->certblob, ca_blob, ca_len); |
| 1883 | xfree(ca_blob); |
| 1884 | |
| 1885 | /* Sign the whole mess */ |
| 1886 | if (key_sign(ca, &sig_blob, &sig_len, buffer_ptr(&k->cert->certblob), |
| 1887 | buffer_len(&k->cert->certblob)) != 0) { |
| 1888 | error("%s: signature operation failed", __func__); |
| 1889 | buffer_clear(&k->cert->certblob); |
| 1890 | return -1; |
| 1891 | } |
| 1892 | /* Append signature and we are done */ |
| 1893 | buffer_put_string(&k->cert->certblob, sig_blob, sig_len); |
| 1894 | xfree(sig_blob); |
| 1895 | |
| 1896 | return 0; |
| 1897 | } |
| 1898 | |
| 1899 | int |
| 1900 | key_cert_check_authority(const Key *k, int want_host, int require_principal, |
| 1901 | const char *name, const char **reason) |
| 1902 | { |
| 1903 | u_int i, principal_matches; |
| 1904 | time_t now = time(NULL); |
| 1905 | |
| 1906 | if (want_host) { |
| 1907 | if (k->cert->type != SSH2_CERT_TYPE_HOST) { |
| 1908 | *reason = "Certificate invalid: not a host certificate"; |
| 1909 | return -1; |
| 1910 | } |
| 1911 | } else { |
| 1912 | if (k->cert->type != SSH2_CERT_TYPE_USER) { |
| 1913 | *reason = "Certificate invalid: not a user certificate"; |
| 1914 | return -1; |
| 1915 | } |
| 1916 | } |
| 1917 | if (now < 0) { |
| 1918 | error("%s: system clock lies before epoch", __func__); |
| 1919 | *reason = "Certificate invalid: not yet valid"; |
| 1920 | return -1; |
| 1921 | } |
| 1922 | if ((u_int64_t)now < k->cert->valid_after) { |
| 1923 | *reason = "Certificate invalid: not yet valid"; |
| 1924 | return -1; |
| 1925 | } |
| 1926 | if ((u_int64_t)now >= k->cert->valid_before) { |
| 1927 | *reason = "Certificate invalid: expired"; |
| 1928 | return -1; |
| 1929 | } |
| 1930 | if (k->cert->nprincipals == 0) { |
| 1931 | if (require_principal) { |
| 1932 | *reason = "Certificate lacks principal list"; |
| 1933 | return -1; |
| 1934 | } |
Damien Miller | 30da344 | 2010-05-10 11:58:03 +1000 | [diff] [blame] | 1935 | } else if (name != NULL) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1936 | principal_matches = 0; |
| 1937 | for (i = 0; i < k->cert->nprincipals; i++) { |
| 1938 | if (strcmp(name, k->cert->principals[i]) == 0) { |
| 1939 | principal_matches = 1; |
| 1940 | break; |
| 1941 | } |
| 1942 | } |
| 1943 | if (!principal_matches) { |
| 1944 | *reason = "Certificate invalid: name is not a listed " |
| 1945 | "principal"; |
| 1946 | return -1; |
| 1947 | } |
| 1948 | } |
| 1949 | return 0; |
| 1950 | } |
Damien Miller | 4e270b0 | 2010-04-16 15:56:21 +1000 | [diff] [blame] | 1951 | |
| 1952 | int |
| 1953 | key_cert_is_legacy(Key *k) |
| 1954 | { |
| 1955 | switch (k->type) { |
| 1956 | case KEY_DSA_CERT_V00: |
| 1957 | case KEY_RSA_CERT_V00: |
| 1958 | return 1; |
| 1959 | default: |
| 1960 | return 0; |
| 1961 | } |
| 1962 | } |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame^] | 1963 | |
| 1964 | int |
| 1965 | key_curve_name_to_nid(const char *name) |
| 1966 | { |
| 1967 | if (strcmp(name, "nistp256") == 0) |
| 1968 | return NID_X9_62_prime256v1; |
| 1969 | else if (strcmp(name, "nistp384") == 0) |
| 1970 | return NID_secp384r1; |
| 1971 | else if (strcmp(name, "nistp521") == 0) |
| 1972 | return NID_secp521r1; |
| 1973 | |
| 1974 | debug("%s: unsupported EC curve name \"%.100s\"", __func__, name); |
| 1975 | return -1; |
| 1976 | } |
| 1977 | |
| 1978 | const char * |
| 1979 | key_curve_nid_to_name(int nid) |
| 1980 | { |
| 1981 | if (nid == NID_X9_62_prime256v1) |
| 1982 | return "nistp256"; |
| 1983 | else if (nid == NID_secp384r1) |
| 1984 | return "nistp384"; |
| 1985 | else if (nid == NID_secp521r1) |
| 1986 | return "nistp521"; |
| 1987 | |
| 1988 | error("%s: unsupported EC curve nid %d", __func__, nid); |
| 1989 | return NULL; |
| 1990 | } |
| 1991 | |
| 1992 | int |
| 1993 | key_ec_validate_public(const EC_GROUP *group, const EC_POINT *public) |
| 1994 | { |
| 1995 | BN_CTX *bnctx; |
| 1996 | EC_POINT *nq = NULL; |
| 1997 | BIGNUM *order, *x, *y, *tmp; |
| 1998 | int ret = -1; |
| 1999 | |
| 2000 | if ((bnctx = BN_CTX_new()) == NULL) |
| 2001 | fatal("%s: BN_CTX_new failed", __func__); |
| 2002 | BN_CTX_start(bnctx); |
| 2003 | |
| 2004 | /* |
| 2005 | * We shouldn't ever hit this case because bignum_get_ecpoint() |
| 2006 | * refuses to load GF2m points. |
| 2007 | */ |
| 2008 | if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != |
| 2009 | NID_X9_62_prime_field) { |
| 2010 | error("%s: group is not a prime field", __func__); |
| 2011 | goto out; |
| 2012 | } |
| 2013 | |
| 2014 | /* Q != infinity */ |
| 2015 | if (EC_POINT_is_at_infinity(group, public)) { |
| 2016 | error("%s: received degenerate public key (infinity)", |
| 2017 | __func__); |
| 2018 | goto out; |
| 2019 | } |
| 2020 | |
| 2021 | if ((x = BN_CTX_get(bnctx)) == NULL || |
| 2022 | (y = BN_CTX_get(bnctx)) == NULL || |
| 2023 | (order = BN_CTX_get(bnctx)) == NULL || |
| 2024 | (tmp = BN_CTX_get(bnctx)) == NULL) |
| 2025 | fatal("%s: BN_CTX_get failed", __func__); |
| 2026 | |
| 2027 | /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */ |
| 2028 | if (EC_GROUP_get_order(group, order, bnctx) != 1) |
| 2029 | fatal("%s: EC_GROUP_get_order failed", __func__); |
| 2030 | if (EC_POINT_get_affine_coordinates_GFp(group, public, |
| 2031 | x, y, bnctx) != 1) |
| 2032 | fatal("%s: EC_POINT_get_affine_coordinates_GFp", __func__); |
| 2033 | if (BN_num_bits(x) <= BN_num_bits(order) / 2) { |
| 2034 | error("%s: public key x coordinate too small: " |
| 2035 | "bits(x) = %d, bits(order)/2 = %d", __func__, |
| 2036 | BN_num_bits(x), BN_num_bits(order) / 2); |
| 2037 | goto out; |
| 2038 | } |
| 2039 | if (BN_num_bits(y) <= BN_num_bits(order) / 2) { |
| 2040 | error("%s: public key y coordinate too small: " |
| 2041 | "bits(y) = %d, bits(order)/2 = %d", __func__, |
| 2042 | BN_num_bits(x), BN_num_bits(order) / 2); |
| 2043 | goto out; |
| 2044 | } |
| 2045 | |
| 2046 | /* nQ == infinity (n == order of subgroup) */ |
| 2047 | if ((nq = EC_POINT_new(group)) == NULL) |
| 2048 | fatal("%s: BN_CTX_tmp failed", __func__); |
| 2049 | if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) |
| 2050 | fatal("%s: EC_GROUP_mul failed", __func__); |
| 2051 | if (EC_POINT_is_at_infinity(group, nq) != 1) { |
| 2052 | error("%s: received degenerate public key (nQ != infinity)", |
| 2053 | __func__); |
| 2054 | goto out; |
| 2055 | } |
| 2056 | |
| 2057 | /* x < order - 1, y < order - 1 */ |
| 2058 | if (!BN_sub(tmp, order, BN_value_one())) |
| 2059 | fatal("%s: BN_sub failed", __func__); |
| 2060 | if (BN_cmp(x, tmp) >= 0) { |
| 2061 | error("%s: public key x coordinate >= group order - 1", |
| 2062 | __func__); |
| 2063 | goto out; |
| 2064 | } |
| 2065 | if (BN_cmp(y, tmp) >= 0) { |
| 2066 | error("%s: public key y coordinate >= group order - 1", |
| 2067 | __func__); |
| 2068 | goto out; |
| 2069 | } |
| 2070 | ret = 0; |
| 2071 | out: |
| 2072 | BN_CTX_free(bnctx); |
| 2073 | EC_POINT_free(nq); |
| 2074 | return ret; |
| 2075 | } |
| 2076 | |
| 2077 | int |
| 2078 | key_ec_validate_private(const EC_KEY *key) |
| 2079 | { |
| 2080 | BN_CTX *bnctx; |
| 2081 | BIGNUM *order, *tmp; |
| 2082 | int ret = -1; |
| 2083 | |
| 2084 | if ((bnctx = BN_CTX_new()) == NULL) |
| 2085 | fatal("%s: BN_CTX_new failed", __func__); |
| 2086 | BN_CTX_start(bnctx); |
| 2087 | |
| 2088 | if ((order = BN_CTX_get(bnctx)) == NULL || |
| 2089 | (tmp = BN_CTX_get(bnctx)) == NULL) |
| 2090 | fatal("%s: BN_CTX_get failed", __func__); |
| 2091 | |
| 2092 | /* log2(private) > log2(order)/2 */ |
| 2093 | if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) |
| 2094 | fatal("%s: EC_GROUP_get_order failed", __func__); |
| 2095 | if (BN_num_bits(EC_KEY_get0_private_key(key)) <= |
| 2096 | BN_num_bits(order) / 2) { |
| 2097 | error("%s: private key too small: " |
| 2098 | "bits(y) = %d, bits(order)/2 = %d", __func__, |
| 2099 | BN_num_bits(EC_KEY_get0_private_key(key)), |
| 2100 | BN_num_bits(order) / 2); |
| 2101 | goto out; |
| 2102 | } |
| 2103 | |
| 2104 | /* private < order - 1 */ |
| 2105 | if (!BN_sub(tmp, order, BN_value_one())) |
| 2106 | fatal("%s: BN_sub failed", __func__); |
| 2107 | if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0) { |
| 2108 | error("%s: private key >= group order - 1", __func__); |
| 2109 | goto out; |
| 2110 | } |
| 2111 | ret = 0; |
| 2112 | out: |
| 2113 | BN_CTX_free(bnctx); |
| 2114 | return ret; |
| 2115 | } |
| 2116 | |
| 2117 | #if defined(DEBUG_KEXECDH) || defined(DEBUG_PK) |
| 2118 | void |
| 2119 | key_dump_ec_point(const EC_GROUP *group, const EC_POINT *point) |
| 2120 | { |
| 2121 | BIGNUM *x, *y; |
| 2122 | BN_CTX *bnctx; |
| 2123 | |
| 2124 | if (point == NULL) { |
| 2125 | fputs("point=(NULL)\n", stderr); |
| 2126 | return; |
| 2127 | } |
| 2128 | if ((bnctx = BN_CTX_new()) == NULL) |
| 2129 | fatal("%s: BN_CTX_new failed", __func__); |
| 2130 | BN_CTX_start(bnctx); |
| 2131 | if ((x = BN_CTX_get(bnctx)) == NULL || (y = BN_CTX_get(bnctx)) == NULL) |
| 2132 | fatal("%s: BN_CTX_get failed", __func__); |
| 2133 | if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != |
| 2134 | NID_X9_62_prime_field) |
| 2135 | fatal("%s: group is not a prime field", __func__); |
| 2136 | if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y, bnctx) != 1) |
| 2137 | fatal("%s: EC_POINT_get_affine_coordinates_GFp", __func__); |
| 2138 | fputs("x=", stderr); |
| 2139 | BN_print_fp(stderr, x); |
| 2140 | fputs("\ny=", stderr); |
| 2141 | BN_print_fp(stderr, y); |
| 2142 | fputs("\n", stderr); |
| 2143 | BN_CTX_free(bnctx); |
| 2144 | } |
| 2145 | |
| 2146 | void |
| 2147 | key_dump_ec_key(const EC_KEY *key) |
| 2148 | { |
| 2149 | const BIGNUM *exponent; |
| 2150 | |
| 2151 | key_dump_ec_point(EC_KEY_get0_group(key), EC_KEY_get0_public_key(key)); |
| 2152 | fputs("exponent=", stderr); |
| 2153 | if ((exponent = EC_KEY_get0_private_key(key)) == NULL) |
| 2154 | fputs("(NULL)", stderr); |
| 2155 | else |
| 2156 | BN_print_fp(stderr, EC_KEY_get0_private_key(key)); |
| 2157 | fputs("\n", stderr); |
| 2158 | } |
| 2159 | #endif /* defined(DEBUG_KEXECDH) || defined(DEBUG_PK) */ |
| 2160 | |