Damien Miller | 1cfbfaf | 2010-03-22 05:58:24 +1100 | [diff] [blame] | 1 | /* $OpenBSD: key.c,v 1.86 2010/03/15 19:40:02 stevesk 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 | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 55 | #include "ssh2.h" |
| 56 | |
| 57 | static struct KeyCert * |
| 58 | cert_new(void) |
| 59 | { |
| 60 | struct KeyCert *cert; |
| 61 | |
| 62 | cert = xcalloc(1, sizeof(*cert)); |
| 63 | buffer_init(&cert->certblob); |
| 64 | buffer_init(&cert->constraints); |
| 65 | cert->key_id = NULL; |
| 66 | cert->principals = NULL; |
| 67 | cert->signature_key = NULL; |
| 68 | return cert; |
| 69 | } |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 70 | |
| 71 | Key * |
| 72 | key_new(int type) |
| 73 | { |
| 74 | Key *k; |
| 75 | RSA *rsa; |
| 76 | DSA *dsa; |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 77 | k = xcalloc(1, sizeof(*k)); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 78 | k->type = type; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 79 | k->dsa = NULL; |
| 80 | k->rsa = NULL; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 81 | k->cert = NULL; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 82 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 83 | case KEY_RSA1: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 84 | case KEY_RSA: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 85 | case KEY_RSA_CERT: |
Damien Miller | da75516 | 2002-01-22 23:09:22 +1100 | [diff] [blame] | 86 | if ((rsa = RSA_new()) == NULL) |
| 87 | fatal("key_new: RSA_new failed"); |
| 88 | if ((rsa->n = BN_new()) == NULL) |
| 89 | fatal("key_new: BN_new failed"); |
| 90 | if ((rsa->e = BN_new()) == NULL) |
| 91 | fatal("key_new: BN_new failed"); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 92 | k->rsa = rsa; |
| 93 | break; |
| 94 | case KEY_DSA: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 95 | case KEY_DSA_CERT: |
Damien Miller | da75516 | 2002-01-22 23:09:22 +1100 | [diff] [blame] | 96 | if ((dsa = DSA_new()) == NULL) |
| 97 | fatal("key_new: DSA_new failed"); |
| 98 | if ((dsa->p = BN_new()) == NULL) |
| 99 | fatal("key_new: BN_new failed"); |
| 100 | if ((dsa->q = BN_new()) == NULL) |
| 101 | fatal("key_new: BN_new failed"); |
| 102 | if ((dsa->g = BN_new()) == NULL) |
| 103 | fatal("key_new: BN_new failed"); |
| 104 | if ((dsa->pub_key = BN_new()) == NULL) |
| 105 | fatal("key_new: BN_new failed"); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 106 | k->dsa = dsa; |
| 107 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 108 | case KEY_UNSPEC: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 109 | break; |
| 110 | default: |
| 111 | fatal("key_new: bad key type %d", k->type); |
| 112 | break; |
| 113 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 114 | |
| 115 | if (key_is_cert(k)) |
| 116 | k->cert = cert_new(); |
| 117 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 118 | return k; |
| 119 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 120 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 121 | void |
| 122 | key_add_private(Key *k) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 123 | { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 124 | switch (k->type) { |
| 125 | case KEY_RSA1: |
| 126 | case KEY_RSA: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 127 | case KEY_RSA_CERT: |
Damien Miller | da75516 | 2002-01-22 23:09:22 +1100 | [diff] [blame] | 128 | if ((k->rsa->d = BN_new()) == NULL) |
| 129 | fatal("key_new_private: BN_new failed"); |
| 130 | if ((k->rsa->iqmp = BN_new()) == NULL) |
| 131 | fatal("key_new_private: BN_new failed"); |
| 132 | if ((k->rsa->q = BN_new()) == NULL) |
| 133 | fatal("key_new_private: BN_new failed"); |
| 134 | if ((k->rsa->p = BN_new()) == NULL) |
| 135 | fatal("key_new_private: BN_new failed"); |
| 136 | if ((k->rsa->dmq1 = BN_new()) == NULL) |
| 137 | fatal("key_new_private: BN_new failed"); |
| 138 | if ((k->rsa->dmp1 = BN_new()) == NULL) |
| 139 | fatal("key_new_private: BN_new failed"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 140 | break; |
| 141 | case KEY_DSA: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 142 | case KEY_DSA_CERT: |
Damien Miller | da75516 | 2002-01-22 23:09:22 +1100 | [diff] [blame] | 143 | if ((k->dsa->priv_key = BN_new()) == NULL) |
| 144 | fatal("key_new_private: BN_new failed"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 145 | break; |
| 146 | case KEY_UNSPEC: |
| 147 | break; |
| 148 | default: |
| 149 | break; |
| 150 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | Key * |
| 154 | key_new_private(int type) |
| 155 | { |
| 156 | Key *k = key_new(type); |
| 157 | |
| 158 | key_add_private(k); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 159 | return k; |
| 160 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 161 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 162 | static void |
| 163 | cert_free(struct KeyCert *cert) |
| 164 | { |
| 165 | u_int i; |
| 166 | |
| 167 | buffer_free(&cert->certblob); |
| 168 | buffer_free(&cert->constraints); |
| 169 | if (cert->key_id != NULL) |
| 170 | xfree(cert->key_id); |
| 171 | for (i = 0; i < cert->nprincipals; i++) |
| 172 | xfree(cert->principals[i]); |
| 173 | if (cert->principals != NULL) |
| 174 | xfree(cert->principals); |
| 175 | if (cert->signature_key != NULL) |
| 176 | key_free(cert->signature_key); |
| 177 | } |
| 178 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 179 | void |
| 180 | key_free(Key *k) |
| 181 | { |
Damien Miller | 429fcc2 | 2006-03-26 14:02:16 +1100 | [diff] [blame] | 182 | if (k == NULL) |
Damien Miller | bbaad77 | 2006-03-26 14:03:03 +1100 | [diff] [blame] | 183 | fatal("key_free: key is NULL"); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 184 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 185 | case KEY_RSA1: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 186 | case KEY_RSA: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 187 | case KEY_RSA_CERT: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 188 | if (k->rsa != NULL) |
| 189 | RSA_free(k->rsa); |
| 190 | k->rsa = NULL; |
| 191 | break; |
| 192 | case KEY_DSA: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 193 | case KEY_DSA_CERT: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 194 | if (k->dsa != NULL) |
| 195 | DSA_free(k->dsa); |
| 196 | k->dsa = NULL; |
| 197 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 198 | case KEY_UNSPEC: |
| 199 | break; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 200 | default: |
| 201 | fatal("key_free: bad key type %d", k->type); |
| 202 | break; |
| 203 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 204 | if (key_is_cert(k)) { |
| 205 | if (k->cert != NULL) |
| 206 | cert_free(k->cert); |
| 207 | k->cert = NULL; |
| 208 | } |
| 209 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 210 | xfree(k); |
| 211 | } |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 212 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 213 | static int |
| 214 | cert_compare(struct KeyCert *a, struct KeyCert *b) |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 215 | { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 216 | if (a == NULL && b == NULL) |
| 217 | return 1; |
| 218 | if (a == NULL || b == NULL) |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 219 | return 0; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 220 | if (buffer_len(&a->certblob) != buffer_len(&b->certblob)) |
| 221 | return 0; |
| 222 | if (memcmp(buffer_ptr(&a->certblob), buffer_ptr(&b->certblob), |
| 223 | buffer_len(&a->certblob)) != 0) |
| 224 | return 0; |
| 225 | return 1; |
| 226 | } |
| 227 | |
| 228 | /* |
| 229 | * Compare public portions of key only, allowing comparisons between |
| 230 | * certificates and plain keys too. |
| 231 | */ |
| 232 | int |
| 233 | key_equal_public(const Key *a, const Key *b) |
| 234 | { |
| 235 | if (a == NULL || b == NULL || |
| 236 | key_type_plain(a->type) != key_type_plain(b->type)) |
| 237 | return 0; |
| 238 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 239 | switch (a->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 240 | case KEY_RSA1: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 241 | case KEY_RSA_CERT: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 242 | case KEY_RSA: |
| 243 | return a->rsa != NULL && b->rsa != NULL && |
| 244 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && |
| 245 | BN_cmp(a->rsa->n, b->rsa->n) == 0; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 246 | case KEY_DSA_CERT: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 247 | case KEY_DSA: |
| 248 | return a->dsa != NULL && b->dsa != NULL && |
| 249 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && |
| 250 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && |
| 251 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && |
| 252 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 253 | default: |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 254 | fatal("key_equal: bad key type %d", a->type); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 255 | } |
Damien Miller | 87dd5f2 | 2008-07-11 17:35:09 +1000 | [diff] [blame] | 256 | /* NOTREACHED */ |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 257 | } |
| 258 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 259 | int |
| 260 | key_equal(const Key *a, const Key *b) |
| 261 | { |
| 262 | if (a == NULL || b == NULL || a->type != b->type) |
| 263 | return 0; |
| 264 | if (key_is_cert(a)) { |
| 265 | if (!cert_compare(a->cert, b->cert)) |
| 266 | return 0; |
| 267 | } |
| 268 | return key_equal_public(a, b); |
| 269 | } |
| 270 | |
Damien Miller | 37876e9 | 2003-05-15 10:19:46 +1000 | [diff] [blame] | 271 | u_char* |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 272 | 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] | 273 | { |
Ben Lindstrom | 80cb27d | 2002-03-05 01:33:36 +0000 | [diff] [blame] | 274 | const EVP_MD *md = NULL; |
Ben Lindstrom | f0b4853 | 2001-03-12 02:59:31 +0000 | [diff] [blame] | 275 | EVP_MD_CTX ctx; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 276 | u_char *blob = NULL; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 277 | u_char *retval = NULL; |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 278 | u_int len = 0; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 279 | int nlen, elen, otype; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 280 | |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 281 | *dgst_raw_length = 0; |
| 282 | |
Ben Lindstrom | f0b4853 | 2001-03-12 02:59:31 +0000 | [diff] [blame] | 283 | switch (dgst_type) { |
| 284 | case SSH_FP_MD5: |
| 285 | md = EVP_md5(); |
| 286 | break; |
| 287 | case SSH_FP_SHA1: |
| 288 | md = EVP_sha1(); |
| 289 | break; |
| 290 | default: |
| 291 | fatal("key_fingerprint_raw: bad digest type %d", |
| 292 | dgst_type); |
| 293 | } |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 294 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 295 | case KEY_RSA1: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 296 | nlen = BN_num_bytes(k->rsa->n); |
| 297 | elen = BN_num_bytes(k->rsa->e); |
| 298 | len = nlen + elen; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 299 | blob = xmalloc(len); |
| 300 | BN_bn2bin(k->rsa->n, blob); |
| 301 | BN_bn2bin(k->rsa->e, blob + nlen); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 302 | break; |
| 303 | case KEY_DSA: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 304 | case KEY_RSA: |
| 305 | key_to_blob(k, &blob, &len); |
| 306 | break; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 307 | case KEY_DSA_CERT: |
| 308 | case KEY_RSA_CERT: |
| 309 | /* We want a fingerprint of the _key_ not of the cert */ |
| 310 | otype = k->type; |
| 311 | k->type = key_type_plain(k->type); |
| 312 | key_to_blob(k, &blob, &len); |
| 313 | k->type = otype; |
| 314 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 315 | case KEY_UNSPEC: |
| 316 | return retval; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 317 | default: |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 318 | fatal("key_fingerprint_raw: bad key type %d", k->type); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 319 | break; |
| 320 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 321 | if (blob != NULL) { |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 322 | retval = xmalloc(EVP_MAX_MD_SIZE); |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 323 | EVP_DigestInit(&ctx, md); |
| 324 | EVP_DigestUpdate(&ctx, blob, len); |
Damien Miller | 3672e4b | 2002-02-05 11:54:07 +1100 | [diff] [blame] | 325 | EVP_DigestFinal(&ctx, retval, dgst_raw_length); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 326 | memset(blob, 0, len); |
| 327 | xfree(blob); |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 328 | } else { |
| 329 | fatal("key_fingerprint_raw: blob is null"); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 330 | } |
| 331 | return retval; |
| 332 | } |
| 333 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 334 | static char * |
| 335 | key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len) |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 336 | { |
| 337 | char *retval; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 338 | u_int i; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 339 | |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 340 | retval = xcalloc(1, dgst_raw_len * 3 + 1); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 341 | for (i = 0; i < dgst_raw_len; i++) { |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 342 | char hex[4]; |
| 343 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); |
Darren Tucker | 2958861 | 2003-07-14 17:28:34 +1000 | [diff] [blame] | 344 | strlcat(retval, hex, dgst_raw_len * 3 + 1); |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 345 | } |
Darren Tucker | 2958861 | 2003-07-14 17:28:34 +1000 | [diff] [blame] | 346 | |
| 347 | /* Remove the trailing ':' character */ |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 348 | retval[(dgst_raw_len * 3) - 1] = '\0'; |
| 349 | return retval; |
| 350 | } |
| 351 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 352 | static char * |
| 353 | key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len) |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 354 | { |
| 355 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; |
| 356 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', |
| 357 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 358 | u_int i, j = 0, rounds, seed = 1; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 359 | char *retval; |
| 360 | |
| 361 | rounds = (dgst_raw_len / 2) + 1; |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 362 | retval = xcalloc((rounds * 6), sizeof(char)); |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 363 | retval[j++] = 'x'; |
| 364 | for (i = 0; i < rounds; i++) { |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 365 | u_int idx0, idx1, idx2, idx3, idx4; |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 366 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
| 367 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 368 | seed) % 6; |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 369 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
| 370 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 371 | (seed / 6)) % 6; |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 372 | retval[j++] = vowels[idx0]; |
| 373 | retval[j++] = consonants[idx1]; |
| 374 | retval[j++] = vowels[idx2]; |
| 375 | if ((i + 1) < rounds) { |
| 376 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; |
| 377 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; |
| 378 | retval[j++] = consonants[idx3]; |
| 379 | retval[j++] = '-'; |
| 380 | retval[j++] = consonants[idx4]; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 381 | seed = ((seed * 5) + |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 382 | ((((u_int)(dgst_raw[2 * i])) * 7) + |
| 383 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 384 | } |
| 385 | } else { |
| 386 | idx0 = seed % 6; |
| 387 | idx1 = 16; |
| 388 | idx2 = seed / 6; |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 389 | retval[j++] = vowels[idx0]; |
| 390 | retval[j++] = consonants[idx1]; |
| 391 | retval[j++] = vowels[idx2]; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 392 | } |
| 393 | } |
Ben Lindstrom | cbe3ad2 | 2001-03-11 20:06:59 +0000 | [diff] [blame] | 394 | retval[j++] = 'x'; |
| 395 | retval[j++] = '\0'; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 396 | return retval; |
| 397 | } |
| 398 | |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 399 | /* |
| 400 | * Draw an ASCII-Art representing the fingerprint so human brain can |
| 401 | * profit from its built-in pattern recognition ability. |
| 402 | * This technique is called "random art" and can be found in some |
| 403 | * scientific publications like this original paper: |
| 404 | * |
| 405 | * "Hash Visualization: a New Technique to improve Real-World Security", |
| 406 | * Perrig A. and Song D., 1999, International Workshop on Cryptographic |
| 407 | * Techniques and E-Commerce (CrypTEC '99) |
| 408 | * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf |
| 409 | * |
| 410 | * The subject came up in a talk by Dan Kaminsky, too. |
| 411 | * |
| 412 | * If you see the picture is different, the key is different. |
| 413 | * If the picture looks the same, you still know nothing. |
| 414 | * |
| 415 | * The algorithm used here is a worm crawling over a discrete plane, |
| 416 | * leaving a trace (augmenting the field) everywhere it goes. |
| 417 | * Movement is taken from dgst_raw 2bit-wise. Bumping into walls |
| 418 | * makes the respective movement vector be ignored for this turn. |
| 419 | * Graphs are not unambiguous, because circles in graphs can be |
| 420 | * walked in either direction. |
| 421 | */ |
Darren Tucker | 987ac84 | 2008-06-13 04:54:40 +1000 | [diff] [blame] | 422 | |
| 423 | /* |
| 424 | * Field sizes for the random art. Have to be odd, so the starting point |
| 425 | * can be in the exact middle of the picture, and FLDBASE should be >=8 . |
| 426 | * Else pictures would be too dense, and drawing the frame would |
| 427 | * fail, too, because the key type would not fit in anymore. |
| 428 | */ |
| 429 | #define FLDBASE 8 |
| 430 | #define FLDSIZE_Y (FLDBASE + 1) |
| 431 | #define FLDSIZE_X (FLDBASE * 2 + 1) |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 432 | static char * |
Darren Tucker | 987ac84 | 2008-06-13 04:54:40 +1000 | [diff] [blame] | 433 | 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] | 434 | { |
| 435 | /* |
| 436 | * Chars to be used after each other every time the worm |
| 437 | * intersects with itself. Matter of taste. |
| 438 | */ |
Darren Tucker | 4b3b977 | 2008-06-13 04:55:10 +1000 | [diff] [blame] | 439 | char *augmentation_string = " .o+=*BOX@%&#/^SE"; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 440 | char *retval, *p; |
Darren Tucker | 014d76f | 2008-06-13 04:43:51 +1000 | [diff] [blame] | 441 | u_char field[FLDSIZE_X][FLDSIZE_Y]; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 442 | u_int i, b; |
| 443 | int x, y; |
Darren Tucker | d32b28a | 2008-06-13 04:45:50 +1000 | [diff] [blame] | 444 | size_t len = strlen(augmentation_string) - 1; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 445 | |
| 446 | retval = xcalloc(1, (FLDSIZE_X + 3) * (FLDSIZE_Y + 2)); |
| 447 | |
| 448 | /* initialize field */ |
Darren Tucker | 014d76f | 2008-06-13 04:43:51 +1000 | [diff] [blame] | 449 | memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char)); |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 450 | x = FLDSIZE_X / 2; |
| 451 | y = FLDSIZE_Y / 2; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 452 | |
| 453 | /* process raw key */ |
| 454 | for (i = 0; i < dgst_raw_len; i++) { |
| 455 | int input; |
| 456 | /* each byte conveys four 2-bit move commands */ |
| 457 | input = dgst_raw[i]; |
| 458 | for (b = 0; b < 4; b++) { |
| 459 | /* evaluate 2 bit, rest is shifted later */ |
| 460 | x += (input & 0x1) ? 1 : -1; |
| 461 | y += (input & 0x2) ? 1 : -1; |
| 462 | |
| 463 | /* assure we are still in bounds */ |
| 464 | x = MAX(x, 0); |
| 465 | y = MAX(y, 0); |
| 466 | x = MIN(x, FLDSIZE_X - 1); |
| 467 | y = MIN(y, FLDSIZE_Y - 1); |
| 468 | |
| 469 | /* augment the field */ |
Damien Miller | c6aadd9 | 2008-11-03 19:16:20 +1100 | [diff] [blame] | 470 | if (field[x][y] < len - 2) |
| 471 | field[x][y]++; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 472 | input = input >> 2; |
| 473 | } |
| 474 | } |
Darren Tucker | 4b3b977 | 2008-06-13 04:55:10 +1000 | [diff] [blame] | 475 | |
| 476 | /* mark starting point and end point*/ |
| 477 | field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1; |
| 478 | field[x][y] = len; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 479 | |
| 480 | /* fill in retval */ |
Damien Miller | 007132a | 2008-06-29 22:45:37 +1000 | [diff] [blame] | 481 | snprintf(retval, FLDSIZE_X, "+--[%4s %4u]", key_type(k), key_size(k)); |
Darren Tucker | 987ac84 | 2008-06-13 04:54:40 +1000 | [diff] [blame] | 482 | p = strchr(retval, '\0'); |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 483 | |
| 484 | /* output upper border */ |
Damien Miller | 007132a | 2008-06-29 22:45:37 +1000 | [diff] [blame] | 485 | for (i = p - retval - 1; i < FLDSIZE_X; i++) |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 486 | *p++ = '-'; |
| 487 | *p++ = '+'; |
| 488 | *p++ = '\n'; |
| 489 | |
| 490 | /* output content */ |
| 491 | for (y = 0; y < FLDSIZE_Y; y++) { |
| 492 | *p++ = '|'; |
| 493 | for (x = 0; x < FLDSIZE_X; x++) |
Darren Tucker | d32b28a | 2008-06-13 04:45:50 +1000 | [diff] [blame] | 494 | *p++ = augmentation_string[MIN(field[x][y], len)]; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 495 | *p++ = '|'; |
| 496 | *p++ = '\n'; |
| 497 | } |
| 498 | |
| 499 | /* output lower border */ |
| 500 | *p++ = '+'; |
| 501 | for (i = 0; i < FLDSIZE_X; i++) |
| 502 | *p++ = '-'; |
| 503 | *p++ = '+'; |
| 504 | |
| 505 | return retval; |
| 506 | } |
| 507 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 508 | char * |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 509 | 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] | 510 | { |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 511 | char *retval = NULL; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 512 | u_char *dgst_raw; |
Damien Miller | 3672e4b | 2002-02-05 11:54:07 +1100 | [diff] [blame] | 513 | u_int dgst_raw_len; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 514 | |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 515 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); |
| 516 | if (!dgst_raw) |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 517 | fatal("key_fingerprint: null from key_fingerprint_raw()"); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 518 | switch (dgst_rep) { |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 519 | case SSH_FP_HEX: |
| 520 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); |
| 521 | break; |
| 522 | case SSH_FP_BUBBLEBABBLE: |
| 523 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); |
| 524 | break; |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 525 | case SSH_FP_RANDOMART: |
Darren Tucker | 987ac84 | 2008-06-13 04:54:40 +1000 | [diff] [blame] | 526 | retval = key_fingerprint_randomart(dgst_raw, dgst_raw_len, k); |
Darren Tucker | 9c16ac9 | 2008-06-13 04:40:35 +1000 | [diff] [blame] | 527 | break; |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 528 | default: |
Damien Miller | 2f54ada | 2008-11-03 19:24:16 +1100 | [diff] [blame] | 529 | fatal("key_fingerprint: bad digest representation %d", |
Ben Lindstrom | 96e8ea6 | 2001-03-11 20:03:44 +0000 | [diff] [blame] | 530 | dgst_rep); |
| 531 | break; |
| 532 | } |
| 533 | memset(dgst_raw, 0, dgst_raw_len); |
| 534 | xfree(dgst_raw); |
| 535 | return retval; |
| 536 | } |
| 537 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 538 | /* |
| 539 | * Reads a multiple-precision integer in decimal from the buffer, and advances |
| 540 | * the pointer. The integer must already be initialized. This function is |
| 541 | * permitted to modify the buffer. This leaves *cpp to point just beyond the |
| 542 | * last processed (and maybe modified) character. Note that this may modify |
| 543 | * the buffer containing the number. |
| 544 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 545 | static int |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 546 | read_bignum(char **cpp, BIGNUM * value) |
| 547 | { |
| 548 | char *cp = *cpp; |
| 549 | int old; |
| 550 | |
| 551 | /* Skip any leading whitespace. */ |
| 552 | for (; *cp == ' ' || *cp == '\t'; cp++) |
| 553 | ; |
| 554 | |
| 555 | /* Check that it begins with a decimal digit. */ |
| 556 | if (*cp < '0' || *cp > '9') |
| 557 | return 0; |
| 558 | |
| 559 | /* Save starting position. */ |
| 560 | *cpp = cp; |
| 561 | |
| 562 | /* Move forward until all decimal digits skipped. */ |
| 563 | for (; *cp >= '0' && *cp <= '9'; cp++) |
| 564 | ; |
| 565 | |
| 566 | /* Save the old terminating character, and replace it by \0. */ |
| 567 | old = *cp; |
| 568 | *cp = 0; |
| 569 | |
| 570 | /* Parse the number. */ |
| 571 | if (BN_dec2bn(&value, *cpp) == 0) |
| 572 | return 0; |
| 573 | |
| 574 | /* Restore old terminating character. */ |
| 575 | *cp = old; |
| 576 | |
| 577 | /* Move beyond the number and return success. */ |
| 578 | *cpp = cp; |
| 579 | return 1; |
| 580 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 581 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 582 | static int |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 583 | write_bignum(FILE *f, BIGNUM *num) |
| 584 | { |
| 585 | char *buf = BN_bn2dec(num); |
| 586 | if (buf == NULL) { |
| 587 | error("write_bignum: BN_bn2dec() failed"); |
| 588 | return 0; |
| 589 | } |
| 590 | fprintf(f, " %s", buf); |
Damien Miller | af3030f | 2001-10-10 15:00:49 +1000 | [diff] [blame] | 591 | OPENSSL_free(buf); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 592 | return 1; |
| 593 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 594 | |
Ben Lindstrom | 309f3d1 | 2001-09-20 00:55:53 +0000 | [diff] [blame] | 595 | /* returns 1 ok, -1 error */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 596 | int |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 597 | key_read(Key *ret, char **cpp) |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 598 | { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 599 | Key *k; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 600 | int success = -1; |
| 601 | char *cp, *space; |
| 602 | int len, n, type; |
| 603 | u_int bits; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 604 | u_char *blob; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 605 | |
| 606 | cp = *cpp; |
| 607 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 608 | switch (ret->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 609 | case KEY_RSA1: |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 610 | /* Get number of bits. */ |
| 611 | if (*cp < '0' || *cp > '9') |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 612 | return -1; /* Bad bit count... */ |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 613 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) |
| 614 | bits = 10 * bits + *cp - '0'; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 615 | if (bits == 0) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 616 | return -1; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 617 | *cpp = cp; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 618 | /* Get public exponent, public modulus. */ |
| 619 | if (!read_bignum(cpp, ret->rsa->e)) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 620 | return -1; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 621 | if (!read_bignum(cpp, ret->rsa->n)) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 622 | return -1; |
Darren Tucker | 561724f | 2010-01-13 22:43:05 +1100 | [diff] [blame] | 623 | /* validate the claimed number of bits */ |
| 624 | if ((u_int)BN_num_bits(ret->rsa->n) != bits) { |
| 625 | verbose("key_read: claimed key size %d does not match " |
| 626 | "actual %d", bits, BN_num_bits(ret->rsa->n)); |
| 627 | return -1; |
| 628 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 629 | success = 1; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 630 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 631 | case KEY_UNSPEC: |
| 632 | case KEY_RSA: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 633 | case KEY_DSA: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 634 | case KEY_DSA_CERT: |
| 635 | case KEY_RSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 636 | space = strchr(cp, ' '); |
| 637 | if (space == NULL) { |
Damien Miller | 386f1f3 | 2003-02-24 11:54:57 +1100 | [diff] [blame] | 638 | debug3("key_read: missing whitespace"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 639 | return -1; |
| 640 | } |
| 641 | *space = '\0'; |
| 642 | type = key_type_from_name(cp); |
| 643 | *space = ' '; |
| 644 | if (type == KEY_UNSPEC) { |
Damien Miller | 386f1f3 | 2003-02-24 11:54:57 +1100 | [diff] [blame] | 645 | debug3("key_read: missing keytype"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 646 | return -1; |
| 647 | } |
| 648 | cp = space+1; |
| 649 | if (*cp == '\0') { |
| 650 | debug3("key_read: short string"); |
| 651 | return -1; |
| 652 | } |
| 653 | if (ret->type == KEY_UNSPEC) { |
| 654 | ret->type = type; |
| 655 | } else if (ret->type != type) { |
| 656 | /* is a key, but different type */ |
| 657 | debug3("key_read: type mismatch"); |
Ben Lindstrom | 309f3d1 | 2001-09-20 00:55:53 +0000 | [diff] [blame] | 658 | return -1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 659 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 660 | len = 2*strlen(cp); |
| 661 | blob = xmalloc(len); |
| 662 | n = uudecode(cp, blob, len); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 663 | if (n < 0) { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 664 | error("key_read: uudecode %s failed", cp); |
Ben Lindstrom | 4cbc181 | 2001-12-06 16:41:41 +0000 | [diff] [blame] | 665 | xfree(blob); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 666 | return -1; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 667 | } |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 668 | k = key_from_blob(blob, (u_int)n); |
Ben Lindstrom | 4cbc181 | 2001-12-06 16:41:41 +0000 | [diff] [blame] | 669 | xfree(blob); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 670 | if (k == NULL) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 671 | error("key_read: key_from_blob %s failed", cp); |
| 672 | return -1; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 673 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 674 | if (k->type != type) { |
| 675 | error("key_read: type mismatch: encoding error"); |
| 676 | key_free(k); |
| 677 | return -1; |
| 678 | } |
| 679 | /*XXXX*/ |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 680 | if (key_is_cert(ret)) { |
| 681 | if (!key_is_cert(k)) { |
| 682 | error("key_read: loaded key is not a cert"); |
| 683 | key_free(k); |
| 684 | return -1; |
| 685 | } |
| 686 | if (ret->cert != NULL) |
| 687 | cert_free(ret->cert); |
| 688 | ret->cert = k->cert; |
| 689 | k->cert = NULL; |
| 690 | } |
| 691 | if (key_type_plain(ret->type) == KEY_RSA) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 692 | if (ret->rsa != NULL) |
| 693 | RSA_free(ret->rsa); |
| 694 | ret->rsa = k->rsa; |
| 695 | k->rsa = NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 696 | #ifdef DEBUG_PK |
| 697 | RSA_print_fp(stderr, ret->rsa, 8); |
| 698 | #endif |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 699 | } |
| 700 | if (key_type_plain(ret->type) == KEY_DSA) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 701 | if (ret->dsa != NULL) |
| 702 | DSA_free(ret->dsa); |
| 703 | ret->dsa = k->dsa; |
| 704 | k->dsa = NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 705 | #ifdef DEBUG_PK |
| 706 | DSA_print_fp(stderr, ret->dsa, 8); |
| 707 | #endif |
| 708 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 709 | success = 1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 710 | /*XXXX*/ |
Ben Lindstrom | 4cbc181 | 2001-12-06 16:41:41 +0000 | [diff] [blame] | 711 | key_free(k); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 712 | if (success != 1) |
| 713 | break; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 714 | /* advance cp: skip whitespace and data */ |
| 715 | while (*cp == ' ' || *cp == '\t') |
| 716 | cp++; |
| 717 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') |
| 718 | cp++; |
| 719 | *cpp = cp; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 720 | break; |
| 721 | default: |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 722 | fatal("key_read: bad key type: %d", ret->type); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 723 | break; |
| 724 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 725 | return success; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 726 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 727 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 728 | int |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 729 | key_write(const Key *key, FILE *f) |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 730 | { |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 731 | int n, success = 0; |
| 732 | u_int len, bits = 0; |
Damien Miller | a10f561 | 2002-09-12 09:49:15 +1000 | [diff] [blame] | 733 | u_char *blob; |
| 734 | char *uu; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 735 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 736 | if (key_is_cert(key)) { |
| 737 | if (key->cert == NULL) { |
| 738 | error("%s: no cert data", __func__); |
| 739 | return 0; |
| 740 | } |
| 741 | if (buffer_len(&key->cert->certblob) == 0) { |
| 742 | error("%s: no signed certificate blob", __func__); |
| 743 | return 0; |
| 744 | } |
| 745 | } |
| 746 | |
| 747 | switch (key->type) { |
| 748 | case KEY_RSA1: |
| 749 | if (key->rsa == NULL) |
| 750 | return 0; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 751 | /* size of modulus 'n' */ |
| 752 | bits = BN_num_bits(key->rsa->n); |
| 753 | fprintf(f, "%u", bits); |
| 754 | if (write_bignum(f, key->rsa->e) && |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 755 | write_bignum(f, key->rsa->n)) |
| 756 | return 1; |
| 757 | error("key_write: failed for RSA key"); |
| 758 | return 0; |
| 759 | case KEY_DSA: |
| 760 | case KEY_DSA_CERT: |
| 761 | if (key->dsa == NULL) |
| 762 | return 0; |
| 763 | break; |
| 764 | case KEY_RSA: |
| 765 | case KEY_RSA_CERT: |
| 766 | if (key->rsa == NULL) |
| 767 | return 0; |
| 768 | break; |
| 769 | default: |
| 770 | return 0; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 771 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 772 | |
| 773 | key_to_blob(key, &blob, &len); |
| 774 | uu = xmalloc(2*len); |
| 775 | n = uuencode(blob, len, uu, 2*len); |
| 776 | if (n > 0) { |
| 777 | fprintf(f, "%s %s", key_ssh_name(key), uu); |
| 778 | success = 1; |
| 779 | } |
| 780 | xfree(blob); |
| 781 | xfree(uu); |
| 782 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 783 | return success; |
| 784 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 785 | |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 786 | const char * |
| 787 | key_type(const Key *k) |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 788 | { |
| 789 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 790 | case KEY_RSA1: |
| 791 | return "RSA1"; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 792 | case KEY_RSA: |
| 793 | return "RSA"; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 794 | case KEY_DSA: |
| 795 | return "DSA"; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 796 | case KEY_RSA_CERT: |
| 797 | return "RSA-CERT"; |
| 798 | case KEY_DSA_CERT: |
| 799 | return "DSA-CERT"; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 800 | } |
| 801 | return "unknown"; |
| 802 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 803 | |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 804 | const char * |
Damien Miller | 1cfbfaf | 2010-03-22 05:58:24 +1100 | [diff] [blame] | 805 | key_cert_type(const Key *k) |
| 806 | { |
| 807 | switch (k->cert->type) { |
| 808 | case SSH2_CERT_TYPE_USER: |
| 809 | return "user"; |
| 810 | case SSH2_CERT_TYPE_HOST: |
| 811 | return "host"; |
| 812 | default: |
| 813 | return "unknown"; |
| 814 | } |
| 815 | } |
| 816 | |
| 817 | const char * |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 818 | key_ssh_name(const Key *k) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 819 | { |
| 820 | switch (k->type) { |
| 821 | case KEY_RSA: |
| 822 | return "ssh-rsa"; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 823 | case KEY_DSA: |
| 824 | return "ssh-dss"; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 825 | case KEY_RSA_CERT: |
| 826 | return "ssh-rsa-cert-v00@openssh.com"; |
| 827 | case KEY_DSA_CERT: |
| 828 | return "ssh-dss-cert-v00@openssh.com"; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 829 | } |
| 830 | return "ssh-unknown"; |
| 831 | } |
Ben Lindstrom | 836f0e9 | 2002-06-23 21:21:30 +0000 | [diff] [blame] | 832 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 833 | u_int |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 834 | key_size(const Key *k) |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 835 | { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 836 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 837 | case KEY_RSA1: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 838 | case KEY_RSA: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 839 | case KEY_RSA_CERT: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 840 | return BN_num_bits(k->rsa->n); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 841 | case KEY_DSA: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 842 | case KEY_DSA_CERT: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 843 | return BN_num_bits(k->dsa->p); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 844 | } |
| 845 | return 0; |
| 846 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 847 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 848 | static RSA * |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 849 | rsa_generate_private_key(u_int bits) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 850 | { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 851 | RSA *private; |
Damien Miller | 69b7203 | 2006-03-26 14:02:35 +1100 | [diff] [blame] | 852 | |
Darren Tucker | 57e0d01 | 2010-01-08 18:52:27 +1100 | [diff] [blame] | 853 | private = RSA_generate_key(bits, RSA_F4, NULL, NULL); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 854 | if (private == NULL) |
| 855 | fatal("rsa_generate_private_key: key generation failed."); |
| 856 | return private; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 857 | } |
| 858 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 859 | static DSA* |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 860 | dsa_generate_private_key(u_int bits) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 861 | { |
| 862 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); |
Damien Miller | 69b7203 | 2006-03-26 14:02:35 +1100 | [diff] [blame] | 863 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 864 | if (private == NULL) |
| 865 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); |
| 866 | if (!DSA_generate_key(private)) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 867 | fatal("dsa_generate_private_key: DSA_generate_key failed."); |
| 868 | if (private == NULL) |
| 869 | fatal("dsa_generate_private_key: NULL."); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 870 | return private; |
| 871 | } |
| 872 | |
| 873 | Key * |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 874 | key_generate(int type, u_int bits) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 875 | { |
| 876 | Key *k = key_new(KEY_UNSPEC); |
| 877 | switch (type) { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 878 | case KEY_DSA: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 879 | k->dsa = dsa_generate_private_key(bits); |
| 880 | break; |
| 881 | case KEY_RSA: |
| 882 | case KEY_RSA1: |
| 883 | k->rsa = rsa_generate_private_key(bits); |
| 884 | break; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 885 | case KEY_RSA_CERT: |
| 886 | case KEY_DSA_CERT: |
| 887 | fatal("key_generate: cert keys cannot be generated directly"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 888 | default: |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 889 | fatal("key_generate: unknown type %d", type); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 890 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 891 | k->type = type; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 892 | return k; |
| 893 | } |
| 894 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 895 | void |
| 896 | key_cert_copy(const Key *from_key, struct Key *to_key) |
| 897 | { |
| 898 | u_int i; |
| 899 | const struct KeyCert *from; |
| 900 | struct KeyCert *to; |
| 901 | |
| 902 | if (to_key->cert != NULL) { |
| 903 | cert_free(to_key->cert); |
| 904 | to_key->cert = NULL; |
| 905 | } |
| 906 | |
| 907 | if ((from = from_key->cert) == NULL) |
| 908 | return; |
| 909 | |
| 910 | to = to_key->cert = cert_new(); |
| 911 | |
| 912 | buffer_append(&to->certblob, buffer_ptr(&from->certblob), |
| 913 | buffer_len(&from->certblob)); |
| 914 | |
| 915 | buffer_append(&to->constraints, buffer_ptr(&from->constraints), |
| 916 | buffer_len(&from->constraints)); |
| 917 | |
| 918 | to->type = from->type; |
| 919 | to->key_id = from->key_id == NULL ? NULL : xstrdup(from->key_id); |
| 920 | to->valid_after = from->valid_after; |
| 921 | to->valid_before = from->valid_before; |
| 922 | to->signature_key = from->signature_key == NULL ? |
| 923 | NULL : key_from_private(from->signature_key); |
| 924 | |
| 925 | to->nprincipals = from->nprincipals; |
| 926 | if (to->nprincipals > CERT_MAX_PRINCIPALS) |
| 927 | fatal("%s: nprincipals (%u) > CERT_MAX_PRINCIPALS (%u)", |
| 928 | __func__, to->nprincipals, CERT_MAX_PRINCIPALS); |
| 929 | if (to->nprincipals > 0) { |
| 930 | to->principals = xcalloc(from->nprincipals, |
| 931 | sizeof(*to->principals)); |
| 932 | for (i = 0; i < to->nprincipals; i++) |
| 933 | to->principals[i] = xstrdup(from->principals[i]); |
| 934 | } |
| 935 | } |
| 936 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 937 | Key * |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 938 | key_from_private(const Key *k) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 939 | { |
| 940 | Key *n = NULL; |
| 941 | switch (k->type) { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 942 | case KEY_DSA: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 943 | case KEY_DSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 944 | n = key_new(k->type); |
Darren Tucker | 0bc8557 | 2006-11-07 23:14:41 +1100 | [diff] [blame] | 945 | if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) || |
| 946 | (BN_copy(n->dsa->q, k->dsa->q) == NULL) || |
| 947 | (BN_copy(n->dsa->g, k->dsa->g) == NULL) || |
| 948 | (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) |
| 949 | fatal("key_from_private: BN_copy failed"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 950 | break; |
| 951 | case KEY_RSA: |
| 952 | case KEY_RSA1: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 953 | case KEY_RSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 954 | n = key_new(k->type); |
Darren Tucker | 0bc8557 | 2006-11-07 23:14:41 +1100 | [diff] [blame] | 955 | if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) || |
| 956 | (BN_copy(n->rsa->e, k->rsa->e) == NULL)) |
| 957 | fatal("key_from_private: BN_copy failed"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 958 | break; |
| 959 | default: |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 960 | fatal("key_from_private: unknown type %d", k->type); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 961 | break; |
| 962 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 963 | if (key_is_cert(k)) |
| 964 | key_cert_copy(k, n); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 965 | return n; |
| 966 | } |
| 967 | |
| 968 | int |
| 969 | key_type_from_name(char *name) |
| 970 | { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 971 | if (strcmp(name, "rsa1") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 972 | return KEY_RSA1; |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 973 | } else if (strcmp(name, "rsa") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 974 | return KEY_RSA; |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 975 | } else if (strcmp(name, "dsa") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 976 | return KEY_DSA; |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 977 | } else if (strcmp(name, "ssh-rsa") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 978 | return KEY_RSA; |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 979 | } else if (strcmp(name, "ssh-dss") == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 980 | return KEY_DSA; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 981 | } else if (strcmp(name, "ssh-rsa-cert-v00@openssh.com") == 0) { |
| 982 | return KEY_RSA_CERT; |
| 983 | } else if (strcmp(name, "ssh-dss-cert-v00@openssh.com") == 0) { |
| 984 | return KEY_DSA_CERT; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 985 | } |
Ben Lindstrom | b54873a | 2001-03-11 20:01:55 +0000 | [diff] [blame] | 986 | debug2("key_type_from_name: unknown key type '%s'", name); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 987 | return KEY_UNSPEC; |
| 988 | } |
| 989 | |
Ben Lindstrom | 982dbbc | 2001-04-17 18:11:36 +0000 | [diff] [blame] | 990 | int |
| 991 | key_names_valid2(const char *names) |
| 992 | { |
| 993 | char *s, *cp, *p; |
| 994 | |
| 995 | if (names == NULL || strcmp(names, "") == 0) |
| 996 | return 0; |
| 997 | s = cp = xstrdup(names); |
| 998 | for ((p = strsep(&cp, ",")); p && *p != '\0'; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 999 | (p = strsep(&cp, ","))) { |
Ben Lindstrom | 982dbbc | 2001-04-17 18:11:36 +0000 | [diff] [blame] | 1000 | switch (key_type_from_name(p)) { |
| 1001 | case KEY_RSA1: |
| 1002 | case KEY_UNSPEC: |
| 1003 | xfree(s); |
| 1004 | return 0; |
| 1005 | } |
| 1006 | } |
| 1007 | debug3("key names ok: [%s]", names); |
| 1008 | xfree(s); |
| 1009 | return 1; |
| 1010 | } |
| 1011 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1012 | static int |
| 1013 | cert_parse(Buffer *b, Key *key, const u_char *blob, u_int blen) |
| 1014 | { |
| 1015 | u_char *principals, *constraints, *sig_key, *sig; |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1016 | u_int signed_len, plen, clen, sklen, slen, kidlen; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1017 | Buffer tmp; |
| 1018 | char *principal; |
| 1019 | int ret = -1; |
| 1020 | |
| 1021 | buffer_init(&tmp); |
| 1022 | |
| 1023 | /* Copy the entire key blob for verification and later serialisation */ |
| 1024 | buffer_append(&key->cert->certblob, blob, blen); |
| 1025 | |
| 1026 | principals = constraints = sig_key = sig = NULL; |
| 1027 | if (buffer_get_int_ret(&key->cert->type, b) != 0 || |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1028 | (key->cert->key_id = buffer_get_string_ret(b, &kidlen)) == NULL || |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1029 | (principals = buffer_get_string_ret(b, &plen)) == NULL || |
| 1030 | buffer_get_int64_ret(&key->cert->valid_after, b) != 0 || |
| 1031 | buffer_get_int64_ret(&key->cert->valid_before, b) != 0 || |
| 1032 | (constraints = buffer_get_string_ret(b, &clen)) == NULL || |
| 1033 | /* skip nonce */ buffer_get_string_ptr_ret(b, NULL) == NULL || |
| 1034 | /* skip reserved */ buffer_get_string_ptr_ret(b, NULL) == NULL || |
| 1035 | (sig_key = buffer_get_string_ret(b, &sklen)) == NULL) { |
| 1036 | error("%s: parse error", __func__); |
| 1037 | goto out; |
| 1038 | } |
| 1039 | |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1040 | if (kidlen != strlen(key->cert->key_id)) { |
| 1041 | error("%s: key ID contains \\0 character", __func__); |
| 1042 | goto out; |
| 1043 | } |
| 1044 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1045 | /* Signature is left in the buffer so we can calculate this length */ |
| 1046 | signed_len = buffer_len(&key->cert->certblob) - buffer_len(b); |
| 1047 | |
| 1048 | if ((sig = buffer_get_string_ret(b, &slen)) == NULL) { |
| 1049 | error("%s: parse error", __func__); |
| 1050 | goto out; |
| 1051 | } |
| 1052 | |
| 1053 | if (key->cert->type != SSH2_CERT_TYPE_USER && |
| 1054 | key->cert->type != SSH2_CERT_TYPE_HOST) { |
| 1055 | error("Unknown certificate type %u", key->cert->type); |
| 1056 | goto out; |
| 1057 | } |
| 1058 | |
| 1059 | buffer_append(&tmp, principals, plen); |
| 1060 | while (buffer_len(&tmp) > 0) { |
| 1061 | if (key->cert->nprincipals >= CERT_MAX_PRINCIPALS) { |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1062 | error("%s: Too many principals", __func__); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1063 | goto out; |
| 1064 | } |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1065 | if ((principal = buffer_get_string_ret(&tmp, &plen)) == NULL) { |
| 1066 | error("%s: Principals data invalid", __func__); |
| 1067 | goto out; |
| 1068 | } |
| 1069 | if (strlen(principal) != plen) { |
| 1070 | error("%s: Principal contains \\0 character", |
| 1071 | __func__); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1072 | goto out; |
| 1073 | } |
| 1074 | key->cert->principals = xrealloc(key->cert->principals, |
| 1075 | key->cert->nprincipals + 1, sizeof(*key->cert->principals)); |
| 1076 | key->cert->principals[key->cert->nprincipals++] = principal; |
| 1077 | } |
| 1078 | |
| 1079 | buffer_clear(&tmp); |
| 1080 | |
| 1081 | buffer_append(&key->cert->constraints, constraints, clen); |
| 1082 | buffer_append(&tmp, constraints, clen); |
| 1083 | /* validate structure */ |
| 1084 | while (buffer_len(&tmp) != 0) { |
Damien Miller | 2befbad | 2010-03-04 21:52:18 +1100 | [diff] [blame] | 1085 | if (buffer_get_string_ptr_ret(&tmp, NULL) == NULL || |
| 1086 | buffer_get_string_ptr_ret(&tmp, NULL) == NULL) { |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1087 | error("%s: Constraints data invalid", __func__); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1088 | goto out; |
| 1089 | } |
| 1090 | } |
| 1091 | buffer_clear(&tmp); |
| 1092 | |
| 1093 | if ((key->cert->signature_key = key_from_blob(sig_key, |
| 1094 | sklen)) == NULL) { |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1095 | error("%s: Signature key invalid", __func__); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1096 | goto out; |
| 1097 | } |
| 1098 | if (key->cert->signature_key->type != KEY_RSA && |
| 1099 | key->cert->signature_key->type != KEY_DSA) { |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1100 | error("%s: Invalid signature key type %s (%d)", __func__, |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1101 | key_type(key->cert->signature_key), |
| 1102 | key->cert->signature_key->type); |
| 1103 | goto out; |
| 1104 | } |
| 1105 | |
| 1106 | switch (key_verify(key->cert->signature_key, sig, slen, |
| 1107 | buffer_ptr(&key->cert->certblob), signed_len)) { |
| 1108 | case 1: |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1109 | ret = 0; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1110 | break; /* Good signature */ |
| 1111 | case 0: |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1112 | error("%s: Invalid signature on certificate", __func__); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1113 | goto out; |
| 1114 | case -1: |
Damien Miller | 4139657 | 2010-03-04 21:51:11 +1100 | [diff] [blame] | 1115 | error("%s: Certificate signature verification failed", |
| 1116 | __func__); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1117 | goto out; |
| 1118 | } |
| 1119 | |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1120 | out: |
| 1121 | buffer_free(&tmp); |
| 1122 | if (principals != NULL) |
| 1123 | xfree(principals); |
| 1124 | if (constraints != NULL) |
| 1125 | xfree(constraints); |
| 1126 | if (sig_key != NULL) |
| 1127 | xfree(sig_key); |
| 1128 | if (sig != NULL) |
| 1129 | xfree(sig); |
| 1130 | return ret; |
| 1131 | } |
| 1132 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1133 | Key * |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1134 | key_from_blob(const u_char *blob, u_int blen) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1135 | { |
| 1136 | Buffer b; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1137 | int rlen, type; |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1138 | char *ktype = NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1139 | Key *key = NULL; |
| 1140 | |
| 1141 | #ifdef DEBUG_PK |
| 1142 | dump_base64(stderr, blob, blen); |
| 1143 | #endif |
| 1144 | buffer_init(&b); |
| 1145 | buffer_append(&b, blob, blen); |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1146 | if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) { |
| 1147 | error("key_from_blob: can't read key type"); |
| 1148 | goto out; |
| 1149 | } |
| 1150 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1151 | type = key_type_from_name(ktype); |
| 1152 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1153 | switch (type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1154 | case KEY_RSA: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1155 | case KEY_RSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1156 | key = key_new(type); |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1157 | if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 || |
| 1158 | buffer_get_bignum2_ret(&b, key->rsa->n) == -1) { |
| 1159 | error("key_from_blob: can't read rsa key"); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1160 | badkey: |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1161 | key_free(key); |
| 1162 | key = NULL; |
| 1163 | goto out; |
| 1164 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1165 | #ifdef DEBUG_PK |
| 1166 | RSA_print_fp(stderr, key->rsa, 8); |
| 1167 | #endif |
| 1168 | break; |
| 1169 | case KEY_DSA: |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1170 | case KEY_DSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1171 | key = key_new(type); |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1172 | if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 || |
| 1173 | buffer_get_bignum2_ret(&b, key->dsa->q) == -1 || |
| 1174 | buffer_get_bignum2_ret(&b, key->dsa->g) == -1 || |
| 1175 | buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) { |
| 1176 | error("key_from_blob: can't read dsa key"); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1177 | goto badkey; |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1178 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1179 | #ifdef DEBUG_PK |
| 1180 | DSA_print_fp(stderr, key->dsa, 8); |
| 1181 | #endif |
| 1182 | break; |
| 1183 | case KEY_UNSPEC: |
| 1184 | key = key_new(type); |
| 1185 | break; |
| 1186 | default: |
| 1187 | error("key_from_blob: cannot handle type %s", ktype); |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1188 | goto out; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1189 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1190 | if (key_is_cert(key) && cert_parse(&b, key, blob, blen) == -1) { |
| 1191 | error("key_from_blob: can't parse cert data"); |
| 1192 | goto badkey; |
| 1193 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1194 | rlen = buffer_len(&b); |
| 1195 | if (key != NULL && rlen != 0) |
| 1196 | error("key_from_blob: remaining bytes in key blob %d", rlen); |
Darren Tucker | 08d04fa | 2004-11-05 20:42:28 +1100 | [diff] [blame] | 1197 | out: |
| 1198 | if (ktype != NULL) |
| 1199 | xfree(ktype); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1200 | buffer_free(&b); |
| 1201 | return key; |
| 1202 | } |
| 1203 | |
| 1204 | int |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1205 | key_to_blob(const Key *key, u_char **blobp, u_int *lenp) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1206 | { |
| 1207 | Buffer b; |
| 1208 | int len; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1209 | |
| 1210 | if (key == NULL) { |
| 1211 | error("key_to_blob: key == NULL"); |
| 1212 | return 0; |
| 1213 | } |
| 1214 | buffer_init(&b); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1215 | switch (key->type) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1216 | case KEY_DSA_CERT: |
| 1217 | case KEY_RSA_CERT: |
| 1218 | /* Use the existing blob */ |
| 1219 | buffer_append(&b, buffer_ptr(&key->cert->certblob), |
| 1220 | buffer_len(&key->cert->certblob)); |
| 1221 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1222 | case KEY_DSA: |
| 1223 | buffer_put_cstring(&b, key_ssh_name(key)); |
| 1224 | buffer_put_bignum2(&b, key->dsa->p); |
| 1225 | buffer_put_bignum2(&b, key->dsa->q); |
| 1226 | buffer_put_bignum2(&b, key->dsa->g); |
| 1227 | buffer_put_bignum2(&b, key->dsa->pub_key); |
| 1228 | break; |
| 1229 | case KEY_RSA: |
| 1230 | buffer_put_cstring(&b, key_ssh_name(key)); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1231 | buffer_put_bignum2(&b, key->rsa->e); |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 1232 | buffer_put_bignum2(&b, key->rsa->n); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1233 | break; |
| 1234 | default: |
Ben Lindstrom | 99a30f1 | 2001-09-18 05:49:14 +0000 | [diff] [blame] | 1235 | error("key_to_blob: unsupported key type %d", key->type); |
| 1236 | buffer_free(&b); |
| 1237 | return 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1238 | } |
| 1239 | len = buffer_len(&b); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1240 | if (lenp != NULL) |
| 1241 | *lenp = len; |
Ben Lindstrom | 2bf759c | 2002-07-07 22:13:31 +0000 | [diff] [blame] | 1242 | if (blobp != NULL) { |
| 1243 | *blobp = xmalloc(len); |
| 1244 | memcpy(*blobp, buffer_ptr(&b), len); |
| 1245 | } |
| 1246 | memset(buffer_ptr(&b), 0, len); |
| 1247 | buffer_free(&b); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1248 | return len; |
| 1249 | } |
| 1250 | |
| 1251 | int |
| 1252 | key_sign( |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1253 | const Key *key, |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 1254 | u_char **sigp, u_int *lenp, |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1255 | const u_char *data, u_int datalen) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1256 | { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1257 | switch (key->type) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1258 | case KEY_DSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1259 | case KEY_DSA: |
| 1260 | return ssh_dss_sign(key, sigp, lenp, data, datalen); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1261 | case KEY_RSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1262 | case KEY_RSA: |
| 1263 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1264 | default: |
Darren Tucker | 5cb30ad | 2004-08-12 22:40:24 +1000 | [diff] [blame] | 1265 | error("key_sign: invalid key type %d", key->type); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1266 | return -1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1267 | } |
| 1268 | } |
| 1269 | |
Ben Lindstrom | 01fff0c | 2002-06-06 20:54:07 +0000 | [diff] [blame] | 1270 | /* |
| 1271 | * key_verify returns 1 for a correct signature, 0 for an incorrect signature |
| 1272 | * and -1 on error. |
| 1273 | */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1274 | int |
| 1275 | key_verify( |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1276 | const Key *key, |
| 1277 | const u_char *signature, u_int signaturelen, |
| 1278 | const u_char *data, u_int datalen) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1279 | { |
Ben Lindstrom | 5363aee | 2001-06-25 04:42:20 +0000 | [diff] [blame] | 1280 | if (signaturelen == 0) |
| 1281 | return -1; |
| 1282 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1283 | switch (key->type) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1284 | case KEY_DSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1285 | case KEY_DSA: |
| 1286 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1287 | case KEY_RSA_CERT: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1288 | case KEY_RSA: |
| 1289 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1290 | default: |
Darren Tucker | 5cb30ad | 2004-08-12 22:40:24 +1000 | [diff] [blame] | 1291 | error("key_verify: invalid key type %d", key->type); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1292 | return -1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1293 | } |
| 1294 | } |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1295 | |
| 1296 | /* Converts a private to a public key */ |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1297 | Key * |
Damien Miller | f58b58c | 2003-11-17 21:18:23 +1100 | [diff] [blame] | 1298 | key_demote(const Key *k) |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1299 | { |
| 1300 | Key *pk; |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 1301 | |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 1302 | pk = xcalloc(1, sizeof(*pk)); |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1303 | pk->type = k->type; |
| 1304 | pk->flags = k->flags; |
| 1305 | pk->dsa = NULL; |
| 1306 | pk->rsa = NULL; |
| 1307 | |
| 1308 | switch (k->type) { |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1309 | case KEY_RSA_CERT: |
| 1310 | key_cert_copy(k, pk); |
| 1311 | /* FALLTHROUGH */ |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1312 | case KEY_RSA1: |
| 1313 | case KEY_RSA: |
| 1314 | if ((pk->rsa = RSA_new()) == NULL) |
| 1315 | fatal("key_demote: RSA_new failed"); |
| 1316 | if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL) |
| 1317 | fatal("key_demote: BN_dup failed"); |
| 1318 | if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL) |
| 1319 | fatal("key_demote: BN_dup failed"); |
| 1320 | break; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1321 | case KEY_DSA_CERT: |
| 1322 | key_cert_copy(k, pk); |
| 1323 | /* FALLTHROUGH */ |
Ben Lindstrom | a674e8d | 2002-03-22 01:45:53 +0000 | [diff] [blame] | 1324 | case KEY_DSA: |
| 1325 | if ((pk->dsa = DSA_new()) == NULL) |
| 1326 | fatal("key_demote: DSA_new failed"); |
| 1327 | if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL) |
| 1328 | fatal("key_demote: BN_dup failed"); |
| 1329 | if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL) |
| 1330 | fatal("key_demote: BN_dup failed"); |
| 1331 | if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL) |
| 1332 | fatal("key_demote: BN_dup failed"); |
| 1333 | if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) |
| 1334 | fatal("key_demote: BN_dup failed"); |
| 1335 | break; |
| 1336 | default: |
| 1337 | fatal("key_free: bad key type %d", k->type); |
| 1338 | break; |
| 1339 | } |
| 1340 | |
| 1341 | return (pk); |
| 1342 | } |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1343 | |
| 1344 | int |
| 1345 | key_is_cert(const Key *k) |
| 1346 | { |
| 1347 | return k != NULL && |
| 1348 | (k->type == KEY_RSA_CERT || k->type == KEY_DSA_CERT); |
| 1349 | } |
| 1350 | |
| 1351 | /* Return the cert-less equivalent to a certified key type */ |
| 1352 | int |
| 1353 | key_type_plain(int type) |
| 1354 | { |
| 1355 | switch (type) { |
| 1356 | case KEY_RSA_CERT: |
| 1357 | return KEY_RSA; |
| 1358 | case KEY_DSA_CERT: |
| 1359 | return KEY_DSA; |
| 1360 | default: |
| 1361 | return type; |
| 1362 | } |
| 1363 | } |
| 1364 | |
| 1365 | /* Convert a KEY_RSA or KEY_DSA to their _CERT equivalent */ |
| 1366 | int |
| 1367 | key_to_certified(Key *k) |
| 1368 | { |
| 1369 | switch (k->type) { |
| 1370 | case KEY_RSA: |
| 1371 | k->cert = cert_new(); |
| 1372 | k->type = KEY_RSA_CERT; |
| 1373 | return 0; |
| 1374 | case KEY_DSA: |
| 1375 | k->cert = cert_new(); |
| 1376 | k->type = KEY_DSA_CERT; |
| 1377 | return 0; |
| 1378 | default: |
| 1379 | error("%s: key has incorrect type %s", __func__, key_type(k)); |
| 1380 | return -1; |
| 1381 | } |
| 1382 | } |
| 1383 | |
| 1384 | /* Convert a KEY_RSA_CERT or KEY_DSA_CERT to their raw key equivalent */ |
| 1385 | int |
| 1386 | key_drop_cert(Key *k) |
| 1387 | { |
| 1388 | switch (k->type) { |
| 1389 | case KEY_RSA_CERT: |
| 1390 | cert_free(k->cert); |
| 1391 | k->type = KEY_RSA; |
| 1392 | return 0; |
| 1393 | case KEY_DSA_CERT: |
| 1394 | cert_free(k->cert); |
| 1395 | k->type = KEY_DSA; |
| 1396 | return 0; |
| 1397 | default: |
| 1398 | error("%s: key has incorrect type %s", __func__, key_type(k)); |
| 1399 | return -1; |
| 1400 | } |
| 1401 | } |
| 1402 | |
| 1403 | /* Sign a KEY_RSA_CERT or KEY_DSA_CERT, (re-)generating the signed certblob */ |
| 1404 | int |
| 1405 | key_certify(Key *k, Key *ca) |
| 1406 | { |
| 1407 | Buffer principals; |
| 1408 | u_char *ca_blob, *sig_blob, nonce[32]; |
| 1409 | u_int i, ca_len, sig_len; |
| 1410 | |
| 1411 | if (k->cert == NULL) { |
| 1412 | error("%s: key lacks cert info", __func__); |
| 1413 | return -1; |
| 1414 | } |
| 1415 | |
| 1416 | if (!key_is_cert(k)) { |
| 1417 | error("%s: certificate has unknown type %d", __func__, |
| 1418 | k->cert->type); |
| 1419 | return -1; |
| 1420 | } |
| 1421 | |
| 1422 | if (ca->type != KEY_RSA && ca->type != KEY_DSA) { |
| 1423 | error("%s: CA key has unsupported type %s", __func__, |
| 1424 | key_type(ca)); |
| 1425 | return -1; |
| 1426 | } |
| 1427 | |
| 1428 | key_to_blob(ca, &ca_blob, &ca_len); |
| 1429 | |
| 1430 | buffer_clear(&k->cert->certblob); |
| 1431 | buffer_put_cstring(&k->cert->certblob, key_ssh_name(k)); |
| 1432 | |
| 1433 | switch (k->type) { |
| 1434 | case KEY_DSA_CERT: |
| 1435 | buffer_put_bignum2(&k->cert->certblob, k->dsa->p); |
| 1436 | buffer_put_bignum2(&k->cert->certblob, k->dsa->q); |
| 1437 | buffer_put_bignum2(&k->cert->certblob, k->dsa->g); |
| 1438 | buffer_put_bignum2(&k->cert->certblob, k->dsa->pub_key); |
| 1439 | break; |
| 1440 | case KEY_RSA_CERT: |
| 1441 | buffer_put_bignum2(&k->cert->certblob, k->rsa->e); |
| 1442 | buffer_put_bignum2(&k->cert->certblob, k->rsa->n); |
| 1443 | break; |
| 1444 | default: |
| 1445 | error("%s: key has incorrect type %s", __func__, key_type(k)); |
| 1446 | buffer_clear(&k->cert->certblob); |
| 1447 | xfree(ca_blob); |
| 1448 | return -1; |
| 1449 | } |
| 1450 | |
| 1451 | buffer_put_int(&k->cert->certblob, k->cert->type); |
| 1452 | buffer_put_cstring(&k->cert->certblob, k->cert->key_id); |
| 1453 | |
| 1454 | buffer_init(&principals); |
| 1455 | for (i = 0; i < k->cert->nprincipals; i++) |
| 1456 | buffer_put_cstring(&principals, k->cert->principals[i]); |
| 1457 | buffer_put_string(&k->cert->certblob, buffer_ptr(&principals), |
| 1458 | buffer_len(&principals)); |
| 1459 | buffer_free(&principals); |
| 1460 | |
| 1461 | buffer_put_int64(&k->cert->certblob, k->cert->valid_after); |
| 1462 | buffer_put_int64(&k->cert->certblob, k->cert->valid_before); |
| 1463 | buffer_put_string(&k->cert->certblob, |
| 1464 | buffer_ptr(&k->cert->constraints), |
| 1465 | buffer_len(&k->cert->constraints)); |
| 1466 | |
| 1467 | arc4random_buf(&nonce, sizeof(nonce)); |
| 1468 | buffer_put_string(&k->cert->certblob, nonce, sizeof(nonce)); |
| 1469 | buffer_put_string(&k->cert->certblob, NULL, 0); /* reserved */ |
| 1470 | buffer_put_string(&k->cert->certblob, ca_blob, ca_len); |
| 1471 | xfree(ca_blob); |
| 1472 | |
| 1473 | /* Sign the whole mess */ |
| 1474 | if (key_sign(ca, &sig_blob, &sig_len, buffer_ptr(&k->cert->certblob), |
| 1475 | buffer_len(&k->cert->certblob)) != 0) { |
| 1476 | error("%s: signature operation failed", __func__); |
| 1477 | buffer_clear(&k->cert->certblob); |
| 1478 | return -1; |
| 1479 | } |
| 1480 | /* Append signature and we are done */ |
| 1481 | buffer_put_string(&k->cert->certblob, sig_blob, sig_len); |
| 1482 | xfree(sig_blob); |
| 1483 | |
| 1484 | return 0; |
| 1485 | } |
| 1486 | |
| 1487 | int |
| 1488 | key_cert_check_authority(const Key *k, int want_host, int require_principal, |
| 1489 | const char *name, const char **reason) |
| 1490 | { |
| 1491 | u_int i, principal_matches; |
| 1492 | time_t now = time(NULL); |
| 1493 | |
| 1494 | if (want_host) { |
| 1495 | if (k->cert->type != SSH2_CERT_TYPE_HOST) { |
| 1496 | *reason = "Certificate invalid: not a host certificate"; |
| 1497 | return -1; |
| 1498 | } |
| 1499 | } else { |
| 1500 | if (k->cert->type != SSH2_CERT_TYPE_USER) { |
| 1501 | *reason = "Certificate invalid: not a user certificate"; |
| 1502 | return -1; |
| 1503 | } |
| 1504 | } |
| 1505 | if (now < 0) { |
| 1506 | error("%s: system clock lies before epoch", __func__); |
| 1507 | *reason = "Certificate invalid: not yet valid"; |
| 1508 | return -1; |
| 1509 | } |
| 1510 | if ((u_int64_t)now < k->cert->valid_after) { |
| 1511 | *reason = "Certificate invalid: not yet valid"; |
| 1512 | return -1; |
| 1513 | } |
| 1514 | if ((u_int64_t)now >= k->cert->valid_before) { |
| 1515 | *reason = "Certificate invalid: expired"; |
| 1516 | return -1; |
| 1517 | } |
| 1518 | if (k->cert->nprincipals == 0) { |
| 1519 | if (require_principal) { |
| 1520 | *reason = "Certificate lacks principal list"; |
| 1521 | return -1; |
| 1522 | } |
| 1523 | } else { |
| 1524 | principal_matches = 0; |
| 1525 | for (i = 0; i < k->cert->nprincipals; i++) { |
| 1526 | if (strcmp(name, k->cert->principals[i]) == 0) { |
| 1527 | principal_matches = 1; |
| 1528 | break; |
| 1529 | } |
| 1530 | } |
| 1531 | if (!principal_matches) { |
| 1532 | *reason = "Certificate invalid: name is not a listed " |
| 1533 | "principal"; |
| 1534 | return -1; |
| 1535 | } |
| 1536 | } |
| 1537 | return 0; |
| 1538 | } |