djm@openbsd.org | 99aa803 | 2020-01-25 23:02:13 +0000 | [diff] [blame] | 1 | /* $OpenBSD: authfile.c,v 1.137 2020/01/25 23:02:13 djm Exp $ */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | bcd00ab | 2013-12-07 10:41:55 +1100 | [diff] [blame] | 3 | * Copyright (c) 2000, 2013 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 24 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 25 | |
| 26 | #include "includes.h" |
Damien Miller | f17883e | 2006-03-15 11:45:54 +1100 | [diff] [blame] | 27 | |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/stat.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 30 | #include <sys/uio.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 31 | |
Darren Tucker | ba72405 | 2006-07-12 22:24:22 +1000 | [diff] [blame] | 32 | #include <errno.h> |
Damien Miller | 57cf638 | 2006-07-10 21:13:46 +1000 | [diff] [blame] | 33 | #include <fcntl.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 34 | #include <stdio.h> |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 35 | #include <stdarg.h> |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 36 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 37 | #include <string.h> |
Damien Miller | e6b3b61 | 2006-07-24 14:01:23 +1000 | [diff] [blame] | 38 | #include <unistd.h> |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 39 | #include <limits.h> |
Damien Miller | 57cf638 | 2006-07-10 21:13:46 +1000 | [diff] [blame] | 40 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 41 | #include "cipher.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 42 | #include "ssh.h" |
| 43 | #include "log.h" |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 44 | #include "authfile.h" |
Darren Tucker | f0f9098 | 2004-12-11 13:39:50 +1100 | [diff] [blame] | 45 | #include "misc.h" |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 46 | #include "atomicio.h" |
markus@openbsd.org | 16db0a7 | 2015-07-09 09:49:46 +0000 | [diff] [blame] | 47 | #include "sshkey.h" |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 48 | #include "sshbuf.h" |
| 49 | #include "ssherr.h" |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 50 | #include "krl.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 51 | |
Damien Miller | 2ce12ef | 2011-05-05 14:17:18 +1000 | [diff] [blame] | 52 | #define MAX_KEY_FILE_SIZE (1024 * 1024) |
| 53 | |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 54 | /* Save a key blob to a file */ |
| 55 | static int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 56 | sshkey_save_private_blob(struct sshbuf *keybuf, const char *filename) |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 57 | { |
djm@openbsd.org | 99aa803 | 2020-01-25 23:02:13 +0000 | [diff] [blame] | 58 | int r; |
| 59 | mode_t omask; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 60 | |
djm@openbsd.org | 99aa803 | 2020-01-25 23:02:13 +0000 | [diff] [blame] | 61 | omask = umask(077); |
| 62 | r = sshbuf_write_file(filename, keybuf); |
| 63 | umask(omask); |
| 64 | return r; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 65 | } |
| 66 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 67 | int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 68 | sshkey_save_private(struct sshkey *key, const char *filename, |
| 69 | const char *passphrase, const char *comment, |
djm@openbsd.org | eb0d8e7 | 2019-07-15 13:16:29 +0000 | [diff] [blame] | 70 | int format, const char *openssh_format_cipher, int openssh_format_rounds) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 71 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 72 | struct sshbuf *keyblob = NULL; |
| 73 | int r; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 74 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 75 | if ((keyblob = sshbuf_new()) == NULL) |
| 76 | return SSH_ERR_ALLOC_FAIL; |
| 77 | if ((r = sshkey_private_to_fileblob(key, keyblob, passphrase, comment, |
djm@openbsd.org | eb0d8e7 | 2019-07-15 13:16:29 +0000 | [diff] [blame] | 78 | format, openssh_format_cipher, openssh_format_rounds)) != 0) |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 79 | goto out; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 80 | if ((r = sshkey_save_private_blob(keyblob, filename)) != 0) |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 81 | goto out; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 82 | r = 0; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 83 | out: |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 84 | sshbuf_free(keyblob); |
| 85 | return r; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 86 | } |
| 87 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 88 | /* XXX remove error() calls from here? */ |
| 89 | int |
| 90 | sshkey_perm_ok(int fd, const char *filename) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 91 | { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 92 | struct stat st; |
| 93 | |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 94 | if (fstat(fd, &st) == -1) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 95 | return SSH_ERR_SYSTEM_ERROR; |
Ben Lindstrom | 7aff261 | 2001-09-23 13:53:22 +0000 | [diff] [blame] | 96 | /* |
| 97 | * if a key owned by the user is accessed, then we check the |
| 98 | * permissions of the file. if the key owned by a different user, |
| 99 | * then we don't care. |
| 100 | */ |
Damien Miller | b70b61f | 2000-09-16 16:25:12 +1100 | [diff] [blame] | 101 | #ifdef HAVE_CYGWIN |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 102 | if (check_ntsec(filename)) |
Damien Miller | b70b61f | 2000-09-16 16:25:12 +1100 | [diff] [blame] | 103 | #endif |
Ben Lindstrom | 7aff261 | 2001-09-23 13:53:22 +0000 | [diff] [blame] | 104 | if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 105 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 106 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); |
| 107 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
Ben Lindstrom | 7aff261 | 2001-09-23 13:53:22 +0000 | [diff] [blame] | 108 | error("Permissions 0%3.3o for '%s' are too open.", |
Damien Miller | 04bd8b0 | 2003-05-25 14:38:33 +1000 | [diff] [blame] | 109 | (u_int)st.st_mode & 0777, filename); |
djm@openbsd.org | 6b0d576 | 2015-04-17 13:32:09 +0000 | [diff] [blame] | 110 | error("It is required that your private key files are NOT accessible by others."); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 111 | error("This private key will be ignored."); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 112 | return SSH_ERR_KEY_BAD_PERMISSIONS; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 113 | } |
| 114 | return 0; |
| 115 | } |
| 116 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 117 | int |
| 118 | sshkey_load_private_type(int type, const char *filename, const char *passphrase, |
dtucker@openbsd.org | 6b39a7b | 2019-08-05 11:50:33 +0000 | [diff] [blame] | 119 | struct sshkey **keyp, char **commentp) |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 120 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 121 | int fd, r; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 122 | |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 123 | if (keyp != NULL) |
| 124 | *keyp = NULL; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 125 | if (commentp != NULL) |
| 126 | *commentp = NULL; |
| 127 | |
dtucker@openbsd.org | 6b39a7b | 2019-08-05 11:50:33 +0000 | [diff] [blame] | 128 | if ((fd = open(filename, O_RDONLY)) == -1) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 129 | return SSH_ERR_SYSTEM_ERROR; |
dtucker@openbsd.org | 6b39a7b | 2019-08-05 11:50:33 +0000 | [diff] [blame] | 130 | |
| 131 | r = sshkey_perm_ok(fd, filename); |
| 132 | if (r != 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 133 | goto out; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 134 | |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 135 | r = sshkey_load_private_type_fd(fd, type, passphrase, keyp, commentp); |
markus@openbsd.org | 1b11ea7 | 2018-02-23 15:58:37 +0000 | [diff] [blame] | 136 | if (r == 0 && keyp && *keyp) |
| 137 | r = sshkey_set_filename(*keyp, filename); |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 138 | out: |
| 139 | close(fd); |
| 140 | return r; |
| 141 | } |
| 142 | |
| 143 | int |
| 144 | sshkey_load_private_type_fd(int fd, int type, const char *passphrase, |
| 145 | struct sshkey **keyp, char **commentp) |
| 146 | { |
| 147 | struct sshbuf *buffer = NULL; |
| 148 | int r; |
| 149 | |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 150 | if (keyp != NULL) |
| 151 | *keyp = NULL; |
djm@openbsd.org | 99aa803 | 2020-01-25 23:02:13 +0000 | [diff] [blame] | 152 | if ((r = sshbuf_load_fd(fd, &buffer)) != 0 || |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 153 | (r = sshkey_parse_private_fileblob_type(buffer, type, |
| 154 | passphrase, keyp, commentp)) != 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 155 | goto out; |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 156 | |
| 157 | /* success */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 158 | r = 0; |
| 159 | out: |
mmcc@openbsd.org | 52d7078 | 2015-12-11 04:21:11 +0000 | [diff] [blame] | 160 | sshbuf_free(buffer); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 161 | return r; |
| 162 | } |
| 163 | |
| 164 | /* XXX this is almost identical to sshkey_load_private_type() */ |
| 165 | int |
| 166 | sshkey_load_private(const char *filename, const char *passphrase, |
| 167 | struct sshkey **keyp, char **commentp) |
| 168 | { |
| 169 | struct sshbuf *buffer = NULL; |
| 170 | int r, fd; |
| 171 | |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 172 | if (keyp != NULL) |
| 173 | *keyp = NULL; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 174 | if (commentp != NULL) |
| 175 | *commentp = NULL; |
| 176 | |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 177 | if ((fd = open(filename, O_RDONLY)) == -1) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 178 | return SSH_ERR_SYSTEM_ERROR; |
| 179 | if (sshkey_perm_ok(fd, filename) != 0) { |
| 180 | r = SSH_ERR_KEY_BAD_PERMISSIONS; |
| 181 | goto out; |
| 182 | } |
djm@openbsd.org | 99aa803 | 2020-01-25 23:02:13 +0000 | [diff] [blame] | 183 | if ((r = sshbuf_load_fd(fd, &buffer)) != 0 || |
tim@openbsd.org | 3c019a9 | 2015-09-13 14:39:16 +0000 | [diff] [blame] | 184 | (r = sshkey_parse_private_fileblob(buffer, passphrase, keyp, |
| 185 | commentp)) != 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 186 | goto out; |
markus@openbsd.org | 1b11ea7 | 2018-02-23 15:58:37 +0000 | [diff] [blame] | 187 | if (keyp && *keyp && |
| 188 | (r = sshkey_set_filename(*keyp, filename)) != 0) |
| 189 | goto out; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 190 | r = 0; |
| 191 | out: |
| 192 | close(fd); |
mmcc@openbsd.org | 52d7078 | 2015-12-11 04:21:11 +0000 | [diff] [blame] | 193 | sshbuf_free(buffer); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 194 | return r; |
| 195 | } |
| 196 | |
| 197 | static int |
| 198 | sshkey_try_load_public(struct sshkey *k, const char *filename, char **commentp) |
| 199 | { |
| 200 | FILE *f; |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 201 | char *line = NULL, *cp; |
| 202 | size_t linesize = 0; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 203 | int r; |
| 204 | |
| 205 | if (commentp != NULL) |
| 206 | *commentp = NULL; |
| 207 | if ((f = fopen(filename, "r")) == NULL) |
| 208 | return SSH_ERR_SYSTEM_ERROR; |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 209 | while (getline(&line, &linesize, f) != -1) { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 210 | cp = line; |
| 211 | switch (*cp) { |
| 212 | case '#': |
| 213 | case '\n': |
| 214 | case '\0': |
| 215 | continue; |
| 216 | } |
| 217 | /* Abort loading if this looks like a private key */ |
| 218 | if (strncmp(cp, "-----BEGIN", 10) == 0 || |
| 219 | strcmp(cp, "SSH PRIVATE KEY FILE") == 0) |
| 220 | break; |
| 221 | /* Skip leading whitespace. */ |
| 222 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) |
| 223 | ; |
| 224 | if (*cp) { |
| 225 | if ((r = sshkey_read(k, &cp)) == 0) { |
| 226 | cp[strcspn(cp, "\r\n")] = '\0'; |
| 227 | if (commentp) { |
| 228 | *commentp = strdup(*cp ? |
| 229 | cp : filename); |
| 230 | if (*commentp == NULL) |
| 231 | r = SSH_ERR_ALLOC_FAIL; |
| 232 | } |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 233 | free(line); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 234 | fclose(f); |
| 235 | return r; |
| 236 | } |
| 237 | } |
| 238 | } |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 239 | free(line); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 240 | fclose(f); |
| 241 | return SSH_ERR_INVALID_FORMAT; |
| 242 | } |
| 243 | |
markus@openbsd.org | afbfa68 | 2017-05-30 08:49:32 +0000 | [diff] [blame] | 244 | /* load public key from any pubkey file */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 245 | int |
| 246 | sshkey_load_public(const char *filename, struct sshkey **keyp, char **commentp) |
| 247 | { |
| 248 | struct sshkey *pub = NULL; |
markus@openbsd.org | afbfa68 | 2017-05-30 08:49:32 +0000 | [diff] [blame] | 249 | char *file = NULL; |
| 250 | int r; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 251 | |
| 252 | if (keyp != NULL) |
| 253 | *keyp = NULL; |
| 254 | if (commentp != NULL) |
| 255 | *commentp = NULL; |
| 256 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 257 | if ((pub = sshkey_new(KEY_UNSPEC)) == NULL) |
| 258 | return SSH_ERR_ALLOC_FAIL; |
| 259 | if ((r = sshkey_try_load_public(pub, filename, commentp)) == 0) { |
markus@openbsd.org | afbfa68 | 2017-05-30 08:49:32 +0000 | [diff] [blame] | 260 | if (keyp != NULL) { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 261 | *keyp = pub; |
markus@openbsd.org | afbfa68 | 2017-05-30 08:49:32 +0000 | [diff] [blame] | 262 | pub = NULL; |
| 263 | } |
| 264 | r = 0; |
| 265 | goto out; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 266 | } |
| 267 | sshkey_free(pub); |
| 268 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 269 | /* try .pub suffix */ |
markus@openbsd.org | afbfa68 | 2017-05-30 08:49:32 +0000 | [diff] [blame] | 270 | if (asprintf(&file, "%s.pub", filename) == -1) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 271 | return SSH_ERR_ALLOC_FAIL; |
markus@openbsd.org | afbfa68 | 2017-05-30 08:49:32 +0000 | [diff] [blame] | 272 | if ((pub = sshkey_new(KEY_UNSPEC)) == NULL) { |
| 273 | r = SSH_ERR_ALLOC_FAIL; |
| 274 | goto out; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 275 | } |
markus@openbsd.org | afbfa68 | 2017-05-30 08:49:32 +0000 | [diff] [blame] | 276 | if ((r = sshkey_try_load_public(pub, file, commentp)) == 0) { |
| 277 | if (keyp != NULL) { |
| 278 | *keyp = pub; |
| 279 | pub = NULL; |
| 280 | } |
| 281 | r = 0; |
| 282 | } |
| 283 | out: |
| 284 | free(file); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 285 | sshkey_free(pub); |
| 286 | return r; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 287 | } |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 288 | |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 289 | /* Load the certificate associated with the named private key */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 290 | int |
| 291 | sshkey_load_cert(const char *filename, struct sshkey **keyp) |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 292 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 293 | struct sshkey *pub = NULL; |
| 294 | char *file = NULL; |
| 295 | int r = SSH_ERR_INTERNAL_ERROR; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 296 | |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 297 | if (keyp != NULL) |
| 298 | *keyp = NULL; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 299 | |
| 300 | if (asprintf(&file, "%s-cert.pub", filename) == -1) |
| 301 | return SSH_ERR_ALLOC_FAIL; |
| 302 | |
| 303 | if ((pub = sshkey_new(KEY_UNSPEC)) == NULL) { |
| 304 | goto out; |
Damien Miller | 5458c4d | 2010-08-05 13:05:15 +1000 | [diff] [blame] | 305 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 306 | if ((r = sshkey_try_load_public(pub, file, NULL)) != 0) |
| 307 | goto out; |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 308 | /* success */ |
| 309 | if (keyp != NULL) { |
| 310 | *keyp = pub; |
| 311 | pub = NULL; |
| 312 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 313 | r = 0; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 314 | out: |
mmcc@openbsd.org | d59ce08 | 2015-12-10 17:08:40 +0000 | [diff] [blame] | 315 | free(file); |
mmcc@openbsd.org | 89540b6 | 2015-12-11 02:31:47 +0000 | [diff] [blame] | 316 | sshkey_free(pub); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 317 | return r; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | /* Load private key and certificate */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 321 | int |
| 322 | sshkey_load_private_cert(int type, const char *filename, const char *passphrase, |
dtucker@openbsd.org | 6b39a7b | 2019-08-05 11:50:33 +0000 | [diff] [blame] | 323 | struct sshkey **keyp) |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 324 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 325 | struct sshkey *key = NULL, *cert = NULL; |
| 326 | int r; |
| 327 | |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 328 | if (keyp != NULL) |
| 329 | *keyp = NULL; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 330 | |
| 331 | switch (type) { |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 332 | #ifdef WITH_OPENSSL |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 333 | case KEY_RSA: |
| 334 | case KEY_DSA: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 335 | case KEY_ECDSA: |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 336 | #endif /* WITH_OPENSSL */ |
markus@openbsd.org | 16db0a7 | 2015-07-09 09:49:46 +0000 | [diff] [blame] | 337 | case KEY_ED25519: |
markus@openbsd.org | 1b11ea7 | 2018-02-23 15:58:37 +0000 | [diff] [blame] | 338 | case KEY_XMSS: |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 339 | case KEY_UNSPEC: |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 340 | break; |
| 341 | default: |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 342 | return SSH_ERR_KEY_TYPE_UNKNOWN; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 343 | } |
| 344 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 345 | if ((r = sshkey_load_private_type(type, filename, |
dtucker@openbsd.org | 6b39a7b | 2019-08-05 11:50:33 +0000 | [diff] [blame] | 346 | passphrase, &key, NULL)) != 0 || |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 347 | (r = sshkey_load_cert(filename, &cert)) != 0) |
| 348 | goto out; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 349 | |
| 350 | /* Make sure the private key matches the certificate */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 351 | if (sshkey_equal_public(key, cert) == 0) { |
| 352 | r = SSH_ERR_KEY_CERT_MISMATCH; |
| 353 | goto out; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 354 | } |
| 355 | |
djm@openbsd.org | c28fc62 | 2015-07-03 03:43:18 +0000 | [diff] [blame] | 356 | if ((r = sshkey_to_certified(key)) != 0 || |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 357 | (r = sshkey_cert_copy(cert, key)) != 0) |
| 358 | goto out; |
| 359 | r = 0; |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 360 | if (keyp != NULL) { |
| 361 | *keyp = key; |
| 362 | key = NULL; |
| 363 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 364 | out: |
mmcc@openbsd.org | 89540b6 | 2015-12-11 02:31:47 +0000 | [diff] [blame] | 365 | sshkey_free(key); |
| 366 | sshkey_free(cert); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 367 | return r; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 368 | } |
| 369 | |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 370 | /* |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 371 | * Returns success if the specified "key" is listed in the file "filename", |
| 372 | * SSH_ERR_KEY_NOT_FOUND: if the key is not listed or another error. |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 373 | * If "strict_type" is set then the key type must match exactly, |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 374 | * otherwise a comparison that ignores certficiate data is performed. |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 375 | * If "check_ca" is set and "key" is a certificate, then its CA key is |
| 376 | * also checked and sshkey_in_file() will return success if either is found. |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 377 | */ |
| 378 | int |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 379 | sshkey_in_file(struct sshkey *key, const char *filename, int strict_type, |
| 380 | int check_ca) |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 381 | { |
| 382 | FILE *f; |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 383 | char *line = NULL, *cp; |
| 384 | size_t linesize = 0; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 385 | int r = 0; |
| 386 | struct sshkey *pub = NULL; |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 387 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 388 | int (*sshkey_compare)(const struct sshkey *, const struct sshkey *) = |
| 389 | strict_type ? sshkey_equal : sshkey_equal_public; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 390 | |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 391 | if ((f = fopen(filename, "r")) == NULL) |
| 392 | return SSH_ERR_SYSTEM_ERROR; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 393 | |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 394 | while (getline(&line, &linesize, f) != -1) { |
djm@openbsd.org | bbc8af7 | 2018-09-21 12:20:12 +0000 | [diff] [blame] | 395 | sshkey_free(pub); |
| 396 | pub = NULL; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 397 | cp = line; |
| 398 | |
| 399 | /* Skip leading whitespace. */ |
| 400 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) |
| 401 | ; |
| 402 | |
| 403 | /* Skip comments and empty lines */ |
| 404 | switch (*cp) { |
| 405 | case '#': |
| 406 | case '\n': |
| 407 | case '\0': |
| 408 | continue; |
| 409 | } |
| 410 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 411 | if ((pub = sshkey_new(KEY_UNSPEC)) == NULL) { |
| 412 | r = SSH_ERR_ALLOC_FAIL; |
| 413 | goto out; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 414 | } |
djm@openbsd.org | bbc8af7 | 2018-09-21 12:20:12 +0000 | [diff] [blame] | 415 | switch (r = sshkey_read(pub, &cp)) { |
| 416 | case 0: |
| 417 | break; |
| 418 | case SSH_ERR_KEY_LENGTH: |
| 419 | continue; |
| 420 | default: |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 421 | goto out; |
djm@openbsd.org | bbc8af7 | 2018-09-21 12:20:12 +0000 | [diff] [blame] | 422 | } |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 423 | if (sshkey_compare(key, pub) || |
| 424 | (check_ca && sshkey_is_cert(key) && |
| 425 | sshkey_compare(key->cert->signature_key, pub))) { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 426 | r = 0; |
| 427 | goto out; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 428 | } |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 429 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 430 | r = SSH_ERR_KEY_NOT_FOUND; |
| 431 | out: |
markus@openbsd.org | 7f90635 | 2018-06-06 18:29:18 +0000 | [diff] [blame] | 432 | free(line); |
mmcc@openbsd.org | 89540b6 | 2015-12-11 02:31:47 +0000 | [diff] [blame] | 433 | sshkey_free(pub); |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 434 | fclose(f); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 435 | return r; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 436 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 437 | |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 438 | /* |
| 439 | * Checks whether the specified key is revoked, returning 0 if not, |
| 440 | * SSH_ERR_KEY_REVOKED if it is or another error code if something |
| 441 | * unexpected happened. |
| 442 | * This will check both the key and, if it is a certificate, its CA key too. |
| 443 | * "revoked_keys_file" may be a KRL or a one-per-line list of public keys. |
| 444 | */ |
| 445 | int |
| 446 | sshkey_check_revoked(struct sshkey *key, const char *revoked_keys_file) |
| 447 | { |
| 448 | int r; |
| 449 | |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 450 | r = ssh_krl_file_contains_key(revoked_keys_file, key); |
| 451 | /* If this was not a KRL to begin with then continue below */ |
| 452 | if (r != SSH_ERR_KRL_BAD_MAGIC) |
| 453 | return r; |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 454 | |
| 455 | /* |
| 456 | * If the file is not a KRL or we can't handle KRLs then attempt to |
| 457 | * parse the file as a flat list of keys. |
| 458 | */ |
| 459 | switch ((r = sshkey_in_file(key, revoked_keys_file, 0, 1))) { |
| 460 | case 0: |
| 461 | /* Key found => revoked */ |
| 462 | return SSH_ERR_KEY_REVOKED; |
| 463 | case SSH_ERR_KEY_NOT_FOUND: |
| 464 | /* Key not found => not revoked */ |
| 465 | return 0; |
| 466 | default: |
| 467 | /* Some other error occurred */ |
| 468 | return r; |
| 469 | } |
| 470 | } |
| 471 | |
djm@openbsd.org | dd8002f | 2019-09-03 08:30:47 +0000 | [diff] [blame] | 472 | /* |
| 473 | * Advanced *cpp past the end of key options, defined as the first unquoted |
| 474 | * whitespace character. Returns 0 on success or -1 on failure (e.g. |
| 475 | * unterminated quotes). |
| 476 | */ |
| 477 | int |
| 478 | sshkey_advance_past_options(char **cpp) |
| 479 | { |
| 480 | char *cp = *cpp; |
| 481 | int quoted = 0; |
| 482 | |
| 483 | for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) { |
| 484 | if (*cp == '\\' && cp[1] == '"') |
| 485 | cp++; /* Skip both */ |
| 486 | else if (*cp == '"') |
| 487 | quoted = !quoted; |
| 488 | } |
| 489 | *cpp = cp; |
| 490 | /* return failure for unterminated quotes */ |
| 491 | return (*cp == '\0' && quoted) ? -1 : 0; |
| 492 | } |
| 493 | |
djm@openbsd.org | 878ba43 | 2020-01-02 22:38:33 +0000 | [diff] [blame] | 494 | /* Save a public key */ |
| 495 | int |
| 496 | sshkey_save_public(const struct sshkey *key, const char *path, |
| 497 | const char *comment) |
| 498 | { |
| 499 | int fd, oerrno; |
| 500 | FILE *f = NULL; |
| 501 | int r = SSH_ERR_INTERNAL_ERROR; |
| 502 | |
| 503 | if ((fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) |
| 504 | return SSH_ERR_SYSTEM_ERROR; |
| 505 | if ((f = fdopen(fd, "w")) == NULL) { |
| 506 | r = SSH_ERR_SYSTEM_ERROR; |
| 507 | goto fail; |
| 508 | } |
| 509 | if ((r = sshkey_write(key, f)) != 0) |
| 510 | goto fail; |
| 511 | fprintf(f, " %s\n", comment); |
| 512 | if (ferror(f) || fclose(f) != 0) { |
| 513 | r = SSH_ERR_SYSTEM_ERROR; |
| 514 | fail: |
| 515 | oerrno = errno; |
| 516 | if (f != NULL) |
| 517 | fclose(f); |
| 518 | else |
| 519 | close(fd); |
| 520 | errno = oerrno; |
| 521 | return r; |
| 522 | } |
| 523 | return 0; |
| 524 | } |