djm@openbsd.org | 54d0220 | 2016-11-25 23:24:45 +0000 | [diff] [blame] | 1 | /* $OpenBSD: authfile.c,v 1.122 2016/11/25 23:24:45 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" |
Damien Miller | 040b64f | 2002-01-22 23:10:04 +1100 | [diff] [blame] | 45 | #include "rsa.h" |
Darren Tucker | f0f9098 | 2004-12-11 13:39:50 +1100 | [diff] [blame] | 46 | #include "misc.h" |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 47 | #include "atomicio.h" |
markus@openbsd.org | 16db0a7 | 2015-07-09 09:49:46 +0000 | [diff] [blame] | 48 | #include "sshkey.h" |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 49 | #include "sshbuf.h" |
| 50 | #include "ssherr.h" |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 51 | #include "krl.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 52 | |
Damien Miller | 2ce12ef | 2011-05-05 14:17:18 +1000 | [diff] [blame] | 53 | #define MAX_KEY_FILE_SIZE (1024 * 1024) |
| 54 | |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 55 | /* Save a key blob to a file */ |
| 56 | static int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 57 | sshkey_save_private_blob(struct sshbuf *keybuf, const char *filename) |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 58 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 59 | int fd, oerrno; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 60 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 61 | if ((fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600)) < 0) |
| 62 | return SSH_ERR_SYSTEM_ERROR; |
| 63 | if (atomicio(vwrite, fd, (u_char *)sshbuf_ptr(keybuf), |
| 64 | sshbuf_len(keybuf)) != sshbuf_len(keybuf)) { |
| 65 | oerrno = errno; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 66 | close(fd); |
| 67 | unlink(filename); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 68 | errno = oerrno; |
| 69 | return SSH_ERR_SYSTEM_ERROR; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 70 | } |
| 71 | close(fd); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 72 | return 0; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 73 | } |
| 74 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 75 | int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 76 | sshkey_save_private(struct sshkey *key, const char *filename, |
| 77 | const char *passphrase, const char *comment, |
| 78 | int force_new_format, const char *new_format_cipher, int new_format_rounds) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 79 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 80 | struct sshbuf *keyblob = NULL; |
| 81 | int r; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 82 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 83 | if ((keyblob = sshbuf_new()) == NULL) |
| 84 | return SSH_ERR_ALLOC_FAIL; |
| 85 | if ((r = sshkey_private_to_fileblob(key, keyblob, passphrase, comment, |
| 86 | force_new_format, new_format_cipher, new_format_rounds)) != 0) |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 87 | goto out; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 88 | if ((r = sshkey_save_private_blob(keyblob, filename)) != 0) |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 89 | goto out; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 90 | r = 0; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 91 | out: |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 92 | sshbuf_free(keyblob); |
| 93 | return r; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 94 | } |
| 95 | |
Damien Miller | 2ce12ef | 2011-05-05 14:17:18 +1000 | [diff] [blame] | 96 | /* Load a key from a fd into a buffer */ |
| 97 | int |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 98 | sshkey_load_file(int fd, struct sshbuf *blob) |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 99 | { |
Damien Miller | 2ce12ef | 2011-05-05 14:17:18 +1000 | [diff] [blame] | 100 | u_char buf[1024]; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 101 | size_t len; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 102 | struct stat st; |
djm@openbsd.org | 54d0220 | 2016-11-25 23:24:45 +0000 | [diff] [blame] | 103 | int r, dontmax = 0; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 104 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 105 | if (fstat(fd, &st) < 0) |
| 106 | return SSH_ERR_SYSTEM_ERROR; |
Damien Miller | 2ce12ef | 2011-05-05 14:17:18 +1000 | [diff] [blame] | 107 | if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 && |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 108 | st.st_size > MAX_KEY_FILE_SIZE) |
| 109 | return SSH_ERR_INVALID_FORMAT; |
djm@openbsd.org | 54d0220 | 2016-11-25 23:24:45 +0000 | [diff] [blame] | 110 | /* |
| 111 | * Pre-allocate the buffer used for the key contents and clamp its |
| 112 | * maximum size. This ensures that key contents are never leaked via |
| 113 | * implicit realloc() in the sshbuf code. |
| 114 | */ |
| 115 | if ((st.st_mode & S_IFREG) == 0 || st.st_size <= 0) { |
| 116 | st.st_size = 64*1024; /* 64k should be enough for anyone :) */ |
| 117 | dontmax = 1; |
| 118 | } |
| 119 | if ((r = sshbuf_allocate(blob, st.st_size)) != 0 || |
| 120 | (dontmax && (r = sshbuf_set_max_size(blob, st.st_size)) != 0)) |
| 121 | return r; |
Damien Miller | 2ce12ef | 2011-05-05 14:17:18 +1000 | [diff] [blame] | 122 | for (;;) { |
| 123 | if ((len = atomicio(read, fd, buf, sizeof(buf))) == 0) { |
| 124 | if (errno == EPIPE) |
| 125 | break; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 126 | r = SSH_ERR_SYSTEM_ERROR; |
| 127 | goto out; |
Damien Miller | 2ce12ef | 2011-05-05 14:17:18 +1000 | [diff] [blame] | 128 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 129 | if ((r = sshbuf_put(blob, buf, len)) != 0) |
| 130 | goto out; |
| 131 | if (sshbuf_len(blob) > MAX_KEY_FILE_SIZE) { |
| 132 | r = SSH_ERR_INVALID_FORMAT; |
| 133 | goto out; |
Damien Miller | 2ce12ef | 2011-05-05 14:17:18 +1000 | [diff] [blame] | 134 | } |
| 135 | } |
Damien Miller | 2ce12ef | 2011-05-05 14:17:18 +1000 | [diff] [blame] | 136 | if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 && |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 137 | st.st_size != (off_t)sshbuf_len(blob)) { |
| 138 | r = SSH_ERR_FILE_CHANGED; |
| 139 | goto out; |
Damien Miller | a232792 | 2010-12-01 12:01:21 +1100 | [diff] [blame] | 140 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 141 | r = 0; |
Damien Miller | 2ce12ef | 2011-05-05 14:17:18 +1000 | [diff] [blame] | 142 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 143 | out: |
| 144 | explicit_bzero(buf, sizeof(buf)); |
| 145 | if (r != 0) |
| 146 | sshbuf_reset(blob); |
| 147 | return r; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 148 | } |
| 149 | |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 150 | #ifdef WITH_SSH1 |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 151 | /* |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 152 | * Loads the public part of the ssh v1 key file. Returns NULL if an error was |
| 153 | * encountered (the file does not exist or is not readable), and the key |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 154 | * otherwise. |
| 155 | */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 156 | static int |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 157 | sshkey_load_public_rsa1(int fd, struct sshkey **keyp, char **commentp) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 158 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 159 | struct sshbuf *b = NULL; |
| 160 | int r; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 161 | |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 162 | if (keyp != NULL) |
| 163 | *keyp = NULL; |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 164 | if (commentp != NULL) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 165 | *commentp = NULL; |
| 166 | |
| 167 | if ((b = sshbuf_new()) == NULL) |
| 168 | return SSH_ERR_ALLOC_FAIL; |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 169 | if ((r = sshkey_load_file(fd, b)) != 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 170 | goto out; |
| 171 | if ((r = sshkey_parse_public_rsa1_fileblob(b, keyp, commentp)) != 0) |
| 172 | goto out; |
| 173 | r = 0; |
| 174 | out: |
| 175 | sshbuf_free(b); |
| 176 | return r; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 177 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 178 | #endif /* WITH_SSH1 */ |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 179 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 180 | /* XXX remove error() calls from here? */ |
| 181 | int |
| 182 | sshkey_perm_ok(int fd, const char *filename) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 183 | { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 184 | struct stat st; |
| 185 | |
Ben Lindstrom | 7aff261 | 2001-09-23 13:53:22 +0000 | [diff] [blame] | 186 | if (fstat(fd, &st) < 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 187 | return SSH_ERR_SYSTEM_ERROR; |
Ben Lindstrom | 7aff261 | 2001-09-23 13:53:22 +0000 | [diff] [blame] | 188 | /* |
| 189 | * if a key owned by the user is accessed, then we check the |
| 190 | * permissions of the file. if the key owned by a different user, |
| 191 | * then we don't care. |
| 192 | */ |
Damien Miller | b70b61f | 2000-09-16 16:25:12 +1100 | [diff] [blame] | 193 | #ifdef HAVE_CYGWIN |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 194 | if (check_ntsec(filename)) |
Damien Miller | b70b61f | 2000-09-16 16:25:12 +1100 | [diff] [blame] | 195 | #endif |
Ben Lindstrom | 7aff261 | 2001-09-23 13:53:22 +0000 | [diff] [blame] | 196 | if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 197 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 198 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); |
| 199 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
Ben Lindstrom | 7aff261 | 2001-09-23 13:53:22 +0000 | [diff] [blame] | 200 | error("Permissions 0%3.3o for '%s' are too open.", |
Damien Miller | 04bd8b0 | 2003-05-25 14:38:33 +1000 | [diff] [blame] | 201 | (u_int)st.st_mode & 0777, filename); |
djm@openbsd.org | 6b0d576 | 2015-04-17 13:32:09 +0000 | [diff] [blame] | 202 | 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] | 203 | error("This private key will be ignored."); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 204 | return SSH_ERR_KEY_BAD_PERMISSIONS; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 205 | } |
| 206 | return 0; |
| 207 | } |
| 208 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 209 | /* XXX kill perm_ok now that we have SSH_ERR_KEY_BAD_PERMISSIONS? */ |
| 210 | int |
| 211 | sshkey_load_private_type(int type, const char *filename, const char *passphrase, |
| 212 | struct sshkey **keyp, char **commentp, int *perm_ok) |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 213 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 214 | int fd, r; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 215 | |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 216 | if (keyp != NULL) |
| 217 | *keyp = NULL; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 218 | if (commentp != NULL) |
| 219 | *commentp = NULL; |
| 220 | |
| 221 | if ((fd = open(filename, O_RDONLY)) < 0) { |
| 222 | if (perm_ok != NULL) |
| 223 | *perm_ok = 0; |
| 224 | return SSH_ERR_SYSTEM_ERROR; |
| 225 | } |
| 226 | if (sshkey_perm_ok(fd, filename) != 0) { |
| 227 | if (perm_ok != NULL) |
| 228 | *perm_ok = 0; |
| 229 | r = SSH_ERR_KEY_BAD_PERMISSIONS; |
| 230 | goto out; |
| 231 | } |
| 232 | if (perm_ok != NULL) |
| 233 | *perm_ok = 1; |
| 234 | |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 235 | r = sshkey_load_private_type_fd(fd, type, passphrase, keyp, commentp); |
| 236 | out: |
| 237 | close(fd); |
| 238 | return r; |
| 239 | } |
| 240 | |
| 241 | int |
| 242 | sshkey_load_private_type_fd(int fd, int type, const char *passphrase, |
| 243 | struct sshkey **keyp, char **commentp) |
| 244 | { |
| 245 | struct sshbuf *buffer = NULL; |
| 246 | int r; |
| 247 | |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 248 | if (keyp != NULL) |
| 249 | *keyp = NULL; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 250 | if ((buffer = sshbuf_new()) == NULL) { |
| 251 | r = SSH_ERR_ALLOC_FAIL; |
| 252 | goto out; |
| 253 | } |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 254 | if ((r = sshkey_load_file(fd, buffer)) != 0 || |
| 255 | (r = sshkey_parse_private_fileblob_type(buffer, type, |
| 256 | passphrase, keyp, commentp)) != 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 257 | goto out; |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 258 | |
| 259 | /* success */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 260 | r = 0; |
| 261 | out: |
mmcc@openbsd.org | 52d7078 | 2015-12-11 04:21:11 +0000 | [diff] [blame] | 262 | sshbuf_free(buffer); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 263 | return r; |
| 264 | } |
| 265 | |
| 266 | /* XXX this is almost identical to sshkey_load_private_type() */ |
| 267 | int |
| 268 | sshkey_load_private(const char *filename, const char *passphrase, |
| 269 | struct sshkey **keyp, char **commentp) |
| 270 | { |
| 271 | struct sshbuf *buffer = NULL; |
| 272 | int r, fd; |
| 273 | |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 274 | if (keyp != NULL) |
| 275 | *keyp = NULL; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 276 | if (commentp != NULL) |
| 277 | *commentp = NULL; |
| 278 | |
| 279 | if ((fd = open(filename, O_RDONLY)) < 0) |
| 280 | return SSH_ERR_SYSTEM_ERROR; |
| 281 | if (sshkey_perm_ok(fd, filename) != 0) { |
| 282 | r = SSH_ERR_KEY_BAD_PERMISSIONS; |
| 283 | goto out; |
| 284 | } |
| 285 | |
| 286 | if ((buffer = sshbuf_new()) == NULL) { |
| 287 | r = SSH_ERR_ALLOC_FAIL; |
| 288 | goto out; |
| 289 | } |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 290 | if ((r = sshkey_load_file(fd, buffer)) != 0 || |
tim@openbsd.org | 3c019a9 | 2015-09-13 14:39:16 +0000 | [diff] [blame] | 291 | (r = sshkey_parse_private_fileblob(buffer, passphrase, keyp, |
| 292 | commentp)) != 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 293 | goto out; |
| 294 | r = 0; |
| 295 | out: |
| 296 | close(fd); |
mmcc@openbsd.org | 52d7078 | 2015-12-11 04:21:11 +0000 | [diff] [blame] | 297 | sshbuf_free(buffer); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 298 | return r; |
| 299 | } |
| 300 | |
| 301 | static int |
| 302 | sshkey_try_load_public(struct sshkey *k, const char *filename, char **commentp) |
| 303 | { |
| 304 | FILE *f; |
| 305 | char line[SSH_MAX_PUBKEY_BYTES]; |
| 306 | char *cp; |
| 307 | u_long linenum = 0; |
| 308 | int r; |
| 309 | |
| 310 | if (commentp != NULL) |
| 311 | *commentp = NULL; |
| 312 | if ((f = fopen(filename, "r")) == NULL) |
| 313 | return SSH_ERR_SYSTEM_ERROR; |
| 314 | while (read_keyfile_line(f, filename, line, sizeof(line), |
| 315 | &linenum) != -1) { |
| 316 | cp = line; |
| 317 | switch (*cp) { |
| 318 | case '#': |
| 319 | case '\n': |
| 320 | case '\0': |
| 321 | continue; |
| 322 | } |
| 323 | /* Abort loading if this looks like a private key */ |
| 324 | if (strncmp(cp, "-----BEGIN", 10) == 0 || |
| 325 | strcmp(cp, "SSH PRIVATE KEY FILE") == 0) |
| 326 | break; |
| 327 | /* Skip leading whitespace. */ |
| 328 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) |
| 329 | ; |
| 330 | if (*cp) { |
| 331 | if ((r = sshkey_read(k, &cp)) == 0) { |
| 332 | cp[strcspn(cp, "\r\n")] = '\0'; |
| 333 | if (commentp) { |
| 334 | *commentp = strdup(*cp ? |
| 335 | cp : filename); |
| 336 | if (*commentp == NULL) |
| 337 | r = SSH_ERR_ALLOC_FAIL; |
| 338 | } |
| 339 | fclose(f); |
| 340 | return r; |
| 341 | } |
| 342 | } |
| 343 | } |
| 344 | fclose(f); |
| 345 | return SSH_ERR_INVALID_FORMAT; |
| 346 | } |
| 347 | |
| 348 | /* load public key from ssh v1 private or any pubkey file */ |
| 349 | int |
| 350 | sshkey_load_public(const char *filename, struct sshkey **keyp, char **commentp) |
| 351 | { |
| 352 | struct sshkey *pub = NULL; |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 353 | char file[PATH_MAX]; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 354 | int r, fd; |
| 355 | |
| 356 | if (keyp != NULL) |
| 357 | *keyp = NULL; |
| 358 | if (commentp != NULL) |
| 359 | *commentp = NULL; |
| 360 | |
djm@openbsd.org | 5248429 | 2015-02-23 16:55:51 +0000 | [diff] [blame] | 361 | /* XXX should load file once and attempt to parse each format */ |
| 362 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 363 | if ((fd = open(filename, O_RDONLY)) < 0) |
| 364 | goto skip; |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 365 | #ifdef WITH_SSH1 |
Damien Miller | db27472 | 2003-05-14 13:45:22 +1000 | [diff] [blame] | 366 | /* try rsa1 private key */ |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 367 | r = sshkey_load_public_rsa1(fd, keyp, commentp); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 368 | close(fd); |
| 369 | switch (r) { |
| 370 | case SSH_ERR_INTERNAL_ERROR: |
| 371 | case SSH_ERR_ALLOC_FAIL: |
| 372 | case SSH_ERR_INVALID_ARGUMENT: |
| 373 | case SSH_ERR_SYSTEM_ERROR: |
| 374 | case 0: |
| 375 | return r; |
| 376 | } |
djm@openbsd.org | 9a47ab8 | 2015-03-31 22:55:50 +0000 | [diff] [blame] | 377 | #else /* WITH_SSH1 */ |
| 378 | close(fd); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 379 | #endif /* WITH_SSH1 */ |
Damien Miller | db27472 | 2003-05-14 13:45:22 +1000 | [diff] [blame] | 380 | |
| 381 | /* try ssh2 public key */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 382 | if ((pub = sshkey_new(KEY_UNSPEC)) == NULL) |
| 383 | return SSH_ERR_ALLOC_FAIL; |
| 384 | if ((r = sshkey_try_load_public(pub, filename, commentp)) == 0) { |
| 385 | if (keyp != NULL) |
| 386 | *keyp = pub; |
| 387 | return 0; |
| 388 | } |
| 389 | sshkey_free(pub); |
| 390 | |
| 391 | #ifdef WITH_SSH1 |
| 392 | /* try rsa1 public key */ |
| 393 | if ((pub = sshkey_new(KEY_RSA1)) == NULL) |
| 394 | return SSH_ERR_ALLOC_FAIL; |
| 395 | if ((r = sshkey_try_load_public(pub, filename, commentp)) == 0) { |
| 396 | if (keyp != NULL) |
| 397 | *keyp = pub; |
| 398 | return 0; |
| 399 | } |
| 400 | sshkey_free(pub); |
| 401 | #endif /* WITH_SSH1 */ |
| 402 | |
| 403 | skip: |
| 404 | /* try .pub suffix */ |
| 405 | if ((pub = sshkey_new(KEY_UNSPEC)) == NULL) |
| 406 | return SSH_ERR_ALLOC_FAIL; |
| 407 | r = SSH_ERR_ALLOC_FAIL; /* in case strlcpy or strlcat fail */ |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 408 | if ((strlcpy(file, filename, sizeof file) < sizeof(file)) && |
| 409 | (strlcat(file, ".pub", sizeof file) < sizeof(file)) && |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 410 | (r = sshkey_try_load_public(pub, file, commentp)) == 0) { |
| 411 | if (keyp != NULL) |
| 412 | *keyp = pub; |
| 413 | return 0; |
| 414 | } |
| 415 | sshkey_free(pub); |
djm@openbsd.org | 5248429 | 2015-02-23 16:55:51 +0000 | [diff] [blame] | 416 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 417 | return r; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 418 | } |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 419 | |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 420 | /* Load the certificate associated with the named private key */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 421 | int |
| 422 | sshkey_load_cert(const char *filename, struct sshkey **keyp) |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 423 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 424 | struct sshkey *pub = NULL; |
| 425 | char *file = NULL; |
| 426 | int r = SSH_ERR_INTERNAL_ERROR; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 427 | |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 428 | if (keyp != NULL) |
| 429 | *keyp = NULL; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 430 | |
| 431 | if (asprintf(&file, "%s-cert.pub", filename) == -1) |
| 432 | return SSH_ERR_ALLOC_FAIL; |
| 433 | |
| 434 | if ((pub = sshkey_new(KEY_UNSPEC)) == NULL) { |
| 435 | goto out; |
Damien Miller | 5458c4d | 2010-08-05 13:05:15 +1000 | [diff] [blame] | 436 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 437 | if ((r = sshkey_try_load_public(pub, file, NULL)) != 0) |
| 438 | goto out; |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 439 | /* success */ |
| 440 | if (keyp != NULL) { |
| 441 | *keyp = pub; |
| 442 | pub = NULL; |
| 443 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 444 | r = 0; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 445 | out: |
mmcc@openbsd.org | d59ce08 | 2015-12-10 17:08:40 +0000 | [diff] [blame] | 446 | free(file); |
mmcc@openbsd.org | 89540b6 | 2015-12-11 02:31:47 +0000 | [diff] [blame] | 447 | sshkey_free(pub); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 448 | return r; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 449 | } |
| 450 | |
| 451 | /* Load private key and certificate */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 452 | int |
| 453 | sshkey_load_private_cert(int type, const char *filename, const char *passphrase, |
| 454 | struct sshkey **keyp, int *perm_ok) |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 455 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 456 | struct sshkey *key = NULL, *cert = NULL; |
| 457 | int r; |
| 458 | |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 459 | if (keyp != NULL) |
| 460 | *keyp = NULL; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 461 | |
| 462 | switch (type) { |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 463 | #ifdef WITH_OPENSSL |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 464 | case KEY_RSA: |
| 465 | case KEY_DSA: |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 466 | case KEY_ECDSA: |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 467 | #endif /* WITH_OPENSSL */ |
markus@openbsd.org | 16db0a7 | 2015-07-09 09:49:46 +0000 | [diff] [blame] | 468 | case KEY_ED25519: |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 469 | case KEY_UNSPEC: |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 470 | break; |
| 471 | default: |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 472 | return SSH_ERR_KEY_TYPE_UNKNOWN; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 473 | } |
| 474 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 475 | if ((r = sshkey_load_private_type(type, filename, |
| 476 | passphrase, &key, NULL, perm_ok)) != 0 || |
| 477 | (r = sshkey_load_cert(filename, &cert)) != 0) |
| 478 | goto out; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 479 | |
| 480 | /* Make sure the private key matches the certificate */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 481 | if (sshkey_equal_public(key, cert) == 0) { |
| 482 | r = SSH_ERR_KEY_CERT_MISMATCH; |
| 483 | goto out; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 484 | } |
| 485 | |
djm@openbsd.org | c28fc62 | 2015-07-03 03:43:18 +0000 | [diff] [blame] | 486 | if ((r = sshkey_to_certified(key)) != 0 || |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 487 | (r = sshkey_cert_copy(cert, key)) != 0) |
| 488 | goto out; |
| 489 | r = 0; |
djm@openbsd.org | dce19bf | 2016-04-09 12:39:30 +0000 | [diff] [blame] | 490 | if (keyp != NULL) { |
| 491 | *keyp = key; |
| 492 | key = NULL; |
| 493 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 494 | out: |
mmcc@openbsd.org | 89540b6 | 2015-12-11 02:31:47 +0000 | [diff] [blame] | 495 | sshkey_free(key); |
| 496 | sshkey_free(cert); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 497 | return r; |
Damien Miller | c158331 | 2010-08-05 13:04:50 +1000 | [diff] [blame] | 498 | } |
| 499 | |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 500 | /* |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 501 | * Returns success if the specified "key" is listed in the file "filename", |
| 502 | * 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] | 503 | * If "strict_type" is set then the key type must match exactly, |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 504 | * otherwise a comparison that ignores certficiate data is performed. |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 505 | * If "check_ca" is set and "key" is a certificate, then its CA key is |
| 506 | * 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] | 507 | */ |
| 508 | int |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 509 | sshkey_in_file(struct sshkey *key, const char *filename, int strict_type, |
| 510 | int check_ca) |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 511 | { |
| 512 | FILE *f; |
| 513 | char line[SSH_MAX_PUBKEY_BYTES]; |
| 514 | char *cp; |
| 515 | u_long linenum = 0; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 516 | int r = 0; |
| 517 | struct sshkey *pub = NULL; |
| 518 | int (*sshkey_compare)(const struct sshkey *, const struct sshkey *) = |
| 519 | strict_type ? sshkey_equal : sshkey_equal_public; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 520 | |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 521 | if ((f = fopen(filename, "r")) == NULL) |
| 522 | return SSH_ERR_SYSTEM_ERROR; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 523 | |
| 524 | while (read_keyfile_line(f, filename, line, sizeof(line), |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 525 | &linenum) != -1) { |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 526 | cp = line; |
| 527 | |
| 528 | /* Skip leading whitespace. */ |
| 529 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) |
| 530 | ; |
| 531 | |
| 532 | /* Skip comments and empty lines */ |
| 533 | switch (*cp) { |
| 534 | case '#': |
| 535 | case '\n': |
| 536 | case '\0': |
| 537 | continue; |
| 538 | } |
| 539 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 540 | if ((pub = sshkey_new(KEY_UNSPEC)) == NULL) { |
| 541 | r = SSH_ERR_ALLOC_FAIL; |
| 542 | goto out; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 543 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 544 | if ((r = sshkey_read(pub, &cp)) != 0) |
| 545 | goto out; |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 546 | if (sshkey_compare(key, pub) || |
| 547 | (check_ca && sshkey_is_cert(key) && |
| 548 | sshkey_compare(key->cert->signature_key, pub))) { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 549 | r = 0; |
| 550 | goto out; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 551 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 552 | sshkey_free(pub); |
| 553 | pub = NULL; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 554 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 555 | r = SSH_ERR_KEY_NOT_FOUND; |
| 556 | out: |
mmcc@openbsd.org | 89540b6 | 2015-12-11 02:31:47 +0000 | [diff] [blame] | 557 | sshkey_free(pub); |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 558 | fclose(f); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 559 | return r; |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 560 | } |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 561 | |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 562 | /* |
| 563 | * Checks whether the specified key is revoked, returning 0 if not, |
| 564 | * SSH_ERR_KEY_REVOKED if it is or another error code if something |
| 565 | * unexpected happened. |
| 566 | * This will check both the key and, if it is a certificate, its CA key too. |
| 567 | * "revoked_keys_file" may be a KRL or a one-per-line list of public keys. |
| 568 | */ |
| 569 | int |
| 570 | sshkey_check_revoked(struct sshkey *key, const char *revoked_keys_file) |
| 571 | { |
| 572 | int r; |
| 573 | |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 574 | r = ssh_krl_file_contains_key(revoked_keys_file, key); |
| 575 | /* If this was not a KRL to begin with then continue below */ |
| 576 | if (r != SSH_ERR_KRL_BAD_MAGIC) |
| 577 | return r; |
djm@openbsd.org | 5e39a49 | 2014-12-04 02:24:32 +0000 | [diff] [blame] | 578 | |
| 579 | /* |
| 580 | * If the file is not a KRL or we can't handle KRLs then attempt to |
| 581 | * parse the file as a flat list of keys. |
| 582 | */ |
| 583 | switch ((r = sshkey_in_file(key, revoked_keys_file, 0, 1))) { |
| 584 | case 0: |
| 585 | /* Key found => revoked */ |
| 586 | return SSH_ERR_KEY_REVOKED; |
| 587 | case SSH_ERR_KEY_NOT_FOUND: |
| 588 | /* Key not found => not revoked */ |
| 589 | return 0; |
| 590 | default: |
| 591 | /* Some other error occurred */ |
| 592 | return r; |
| 593 | } |
| 594 | } |
| 595 | |