blob: c3a6345d34383305a5f445d1edb417701c5f787b [file] [log] [blame]
markus@openbsd.org7f906352018-06-06 18:29:18 +00001/* $OpenBSD: authfile.c,v 1.129 2018/06/06 18:29:18 markus Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Millerbcd00ab2013-12-07 10:41:55 +11003 * Copyright (c) 2000, 2013 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +11004 *
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 Miller95def091999-11-25 00:26:21 +110024 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100025
26#include "includes.h"
Damien Millerf17883e2006-03-15 11:45:54 +110027
28#include <sys/types.h>
29#include <sys/stat.h>
Damien Millerd7834352006-08-05 12:39:39 +100030#include <sys/uio.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100031
Darren Tuckerba724052006-07-12 22:24:22 +100032#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100033#include <fcntl.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100034#include <stdio.h>
Damien Miller86687062014-07-02 15:28:02 +100035#include <stdarg.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100036#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100037#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100038#include <unistd.h>
deraadt@openbsd.org087266e2015-01-20 23:14:00 +000039#include <limits.h>
Damien Miller57cf6382006-07-10 21:13:46 +100040
Damien Millerd7834352006-08-05 12:39:39 +100041#include "cipher.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000042#include "ssh.h"
43#include "log.h"
Ben Lindstrom31ca54a2001-02-09 02:11:24 +000044#include "authfile.h"
Darren Tuckerf0f90982004-12-11 13:39:50 +110045#include "misc.h"
Damien Millereccb9de2005-06-17 12:59:34 +100046#include "atomicio.h"
markus@openbsd.org16db0a72015-07-09 09:49:46 +000047#include "sshkey.h"
Damien Miller86687062014-07-02 15:28:02 +100048#include "sshbuf.h"
49#include "ssherr.h"
djm@openbsd.org5e39a492014-12-04 02:24:32 +000050#include "krl.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100051
Damien Miller2ce12ef2011-05-05 14:17:18 +100052#define MAX_KEY_FILE_SIZE (1024 * 1024)
53
Damien Millera2327922010-12-01 12:01:21 +110054/* Save a key blob to a file */
55static int
Damien Miller86687062014-07-02 15:28:02 +100056sshkey_save_private_blob(struct sshbuf *keybuf, const char *filename)
Damien Millera2327922010-12-01 12:01:21 +110057{
Damien Miller86687062014-07-02 15:28:02 +100058 int fd, oerrno;
Damien Millera2327922010-12-01 12:01:21 +110059
Damien Miller86687062014-07-02 15:28:02 +100060 if ((fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600)) < 0)
61 return SSH_ERR_SYSTEM_ERROR;
62 if (atomicio(vwrite, fd, (u_char *)sshbuf_ptr(keybuf),
63 sshbuf_len(keybuf)) != sshbuf_len(keybuf)) {
64 oerrno = errno;
Damien Millera2327922010-12-01 12:01:21 +110065 close(fd);
66 unlink(filename);
Damien Miller86687062014-07-02 15:28:02 +100067 errno = oerrno;
68 return SSH_ERR_SYSTEM_ERROR;
Damien Millera2327922010-12-01 12:01:21 +110069 }
70 close(fd);
Damien Miller86687062014-07-02 15:28:02 +100071 return 0;
Damien Millera2327922010-12-01 12:01:21 +110072}
73
Damien Millereba71ba2000-04-29 23:57:08 +100074int
Damien Miller86687062014-07-02 15:28:02 +100075sshkey_save_private(struct sshkey *key, const char *filename,
76 const char *passphrase, const char *comment,
77 int force_new_format, const char *new_format_cipher, int new_format_rounds)
Damien Millereba71ba2000-04-29 23:57:08 +100078{
Damien Miller86687062014-07-02 15:28:02 +100079 struct sshbuf *keyblob = NULL;
80 int r;
Damien Millera2327922010-12-01 12:01:21 +110081
Damien Miller86687062014-07-02 15:28:02 +100082 if ((keyblob = sshbuf_new()) == NULL)
83 return SSH_ERR_ALLOC_FAIL;
84 if ((r = sshkey_private_to_fileblob(key, keyblob, passphrase, comment,
85 force_new_format, new_format_cipher, new_format_rounds)) != 0)
Damien Millera2327922010-12-01 12:01:21 +110086 goto out;
Damien Miller86687062014-07-02 15:28:02 +100087 if ((r = sshkey_save_private_blob(keyblob, filename)) != 0)
Damien Millera2327922010-12-01 12:01:21 +110088 goto out;
Damien Miller86687062014-07-02 15:28:02 +100089 r = 0;
Damien Millera2327922010-12-01 12:01:21 +110090 out:
Damien Miller86687062014-07-02 15:28:02 +100091 sshbuf_free(keyblob);
92 return r;
Damien Millera2327922010-12-01 12:01:21 +110093}
94
Damien Miller2ce12ef2011-05-05 14:17:18 +100095/* Load a key from a fd into a buffer */
96int
djm@openbsd.org1195f4c2015-01-08 10:14:08 +000097sshkey_load_file(int fd, struct sshbuf *blob)
Damien Millera2327922010-12-01 12:01:21 +110098{
Damien Miller2ce12ef2011-05-05 14:17:18 +100099 u_char buf[1024];
Damien Millera2327922010-12-01 12:01:21 +1100100 size_t len;
Damien Millera2327922010-12-01 12:01:21 +1100101 struct stat st;
deraadt@openbsd.org9e509d42017-05-31 09:15:42 +0000102 int r;
Damien Millera2327922010-12-01 12:01:21 +1100103
Damien Miller86687062014-07-02 15:28:02 +1000104 if (fstat(fd, &st) < 0)
105 return SSH_ERR_SYSTEM_ERROR;
Damien Miller2ce12ef2011-05-05 14:17:18 +1000106 if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 &&
Damien Miller86687062014-07-02 15:28:02 +1000107 st.st_size > MAX_KEY_FILE_SIZE)
108 return SSH_ERR_INVALID_FORMAT;
Damien Miller2ce12ef2011-05-05 14:17:18 +1000109 for (;;) {
110 if ((len = atomicio(read, fd, buf, sizeof(buf))) == 0) {
111 if (errno == EPIPE)
112 break;
Damien Miller86687062014-07-02 15:28:02 +1000113 r = SSH_ERR_SYSTEM_ERROR;
114 goto out;
Damien Miller2ce12ef2011-05-05 14:17:18 +1000115 }
Damien Miller86687062014-07-02 15:28:02 +1000116 if ((r = sshbuf_put(blob, buf, len)) != 0)
117 goto out;
118 if (sshbuf_len(blob) > MAX_KEY_FILE_SIZE) {
119 r = SSH_ERR_INVALID_FORMAT;
120 goto out;
Damien Miller2ce12ef2011-05-05 14:17:18 +1000121 }
122 }
Damien Miller2ce12ef2011-05-05 14:17:18 +1000123 if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 &&
Damien Miller86687062014-07-02 15:28:02 +1000124 st.st_size != (off_t)sshbuf_len(blob)) {
125 r = SSH_ERR_FILE_CHANGED;
126 goto out;
Damien Millera2327922010-12-01 12:01:21 +1100127 }
Damien Miller86687062014-07-02 15:28:02 +1000128 r = 0;
Damien Miller2ce12ef2011-05-05 14:17:18 +1000129
Damien Miller86687062014-07-02 15:28:02 +1000130 out:
131 explicit_bzero(buf, sizeof(buf));
132 if (r != 0)
133 sshbuf_reset(blob);
134 return r;
Damien Millereba71ba2000-04-29 23:57:08 +1000135}
136
Damien Millereba71ba2000-04-29 23:57:08 +1000137
Damien Miller86687062014-07-02 15:28:02 +1000138/* XXX remove error() calls from here? */
139int
140sshkey_perm_ok(int fd, const char *filename)
Damien Millereba71ba2000-04-29 23:57:08 +1000141{
Damien Millereba71ba2000-04-29 23:57:08 +1000142 struct stat st;
143
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000144 if (fstat(fd, &st) < 0)
Damien Miller86687062014-07-02 15:28:02 +1000145 return SSH_ERR_SYSTEM_ERROR;
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000146 /*
147 * if a key owned by the user is accessed, then we check the
148 * permissions of the file. if the key owned by a different user,
149 * then we don't care.
150 */
Damien Millerb70b61f2000-09-16 16:25:12 +1100151#ifdef HAVE_CYGWIN
Damien Millercb5e44a2000-09-29 12:12:36 +1100152 if (check_ntsec(filename))
Damien Millerb70b61f2000-09-16 16:25:12 +1100153#endif
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000154 if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
Damien Millereba71ba2000-04-29 23:57:08 +1000155 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
156 error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
157 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000158 error("Permissions 0%3.3o for '%s' are too open.",
Damien Miller04bd8b02003-05-25 14:38:33 +1000159 (u_int)st.st_mode & 0777, filename);
djm@openbsd.org6b0d5762015-04-17 13:32:09 +0000160 error("It is required that your private key files are NOT accessible by others.");
Ben Lindstromd0fca422001-03-26 13:44:06 +0000161 error("This private key will be ignored.");
Damien Miller86687062014-07-02 15:28:02 +1000162 return SSH_ERR_KEY_BAD_PERMISSIONS;
Damien Millere4340be2000-09-16 13:29:08 +1100163 }
164 return 0;
165}
166
Damien Miller86687062014-07-02 15:28:02 +1000167/* XXX kill perm_ok now that we have SSH_ERR_KEY_BAD_PERMISSIONS? */
168int
169sshkey_load_private_type(int type, const char *filename, const char *passphrase,
170 struct sshkey **keyp, char **commentp, int *perm_ok)
Damien Millere4340be2000-09-16 13:29:08 +1100171{
Damien Miller86687062014-07-02 15:28:02 +1000172 int fd, r;
Damien Millere4340be2000-09-16 13:29:08 +1100173
djm@openbsd.orgdce19bf2016-04-09 12:39:30 +0000174 if (keyp != NULL)
175 *keyp = NULL;
Damien Miller86687062014-07-02 15:28:02 +1000176 if (commentp != NULL)
177 *commentp = NULL;
178
179 if ((fd = open(filename, O_RDONLY)) < 0) {
180 if (perm_ok != NULL)
181 *perm_ok = 0;
182 return SSH_ERR_SYSTEM_ERROR;
183 }
184 if (sshkey_perm_ok(fd, filename) != 0) {
185 if (perm_ok != NULL)
186 *perm_ok = 0;
187 r = SSH_ERR_KEY_BAD_PERMISSIONS;
188 goto out;
189 }
190 if (perm_ok != NULL)
191 *perm_ok = 1;
192
djm@openbsd.org1195f4c2015-01-08 10:14:08 +0000193 r = sshkey_load_private_type_fd(fd, type, passphrase, keyp, commentp);
markus@openbsd.org1b11ea72018-02-23 15:58:37 +0000194 if (r == 0 && keyp && *keyp)
195 r = sshkey_set_filename(*keyp, filename);
djm@openbsd.org1195f4c2015-01-08 10:14:08 +0000196 out:
197 close(fd);
198 return r;
199}
200
201int
202sshkey_load_private_type_fd(int fd, int type, const char *passphrase,
203 struct sshkey **keyp, char **commentp)
204{
205 struct sshbuf *buffer = NULL;
206 int r;
207
djm@openbsd.orgdce19bf2016-04-09 12:39:30 +0000208 if (keyp != NULL)
209 *keyp = NULL;
Damien Miller86687062014-07-02 15:28:02 +1000210 if ((buffer = sshbuf_new()) == NULL) {
211 r = SSH_ERR_ALLOC_FAIL;
212 goto out;
213 }
djm@openbsd.org1195f4c2015-01-08 10:14:08 +0000214 if ((r = sshkey_load_file(fd, buffer)) != 0 ||
215 (r = sshkey_parse_private_fileblob_type(buffer, type,
216 passphrase, keyp, commentp)) != 0)
Damien Miller86687062014-07-02 15:28:02 +1000217 goto out;
djm@openbsd.org1195f4c2015-01-08 10:14:08 +0000218
219 /* success */
Damien Miller86687062014-07-02 15:28:02 +1000220 r = 0;
221 out:
mmcc@openbsd.org52d70782015-12-11 04:21:11 +0000222 sshbuf_free(buffer);
Damien Miller86687062014-07-02 15:28:02 +1000223 return r;
224}
225
226/* XXX this is almost identical to sshkey_load_private_type() */
227int
228sshkey_load_private(const char *filename, const char *passphrase,
229 struct sshkey **keyp, char **commentp)
230{
231 struct sshbuf *buffer = NULL;
232 int r, fd;
233
djm@openbsd.orgdce19bf2016-04-09 12:39:30 +0000234 if (keyp != NULL)
235 *keyp = NULL;
Damien Miller86687062014-07-02 15:28:02 +1000236 if (commentp != NULL)
237 *commentp = NULL;
238
239 if ((fd = open(filename, O_RDONLY)) < 0)
240 return SSH_ERR_SYSTEM_ERROR;
241 if (sshkey_perm_ok(fd, filename) != 0) {
242 r = SSH_ERR_KEY_BAD_PERMISSIONS;
243 goto out;
244 }
245
246 if ((buffer = sshbuf_new()) == NULL) {
247 r = SSH_ERR_ALLOC_FAIL;
248 goto out;
249 }
djm@openbsd.org1195f4c2015-01-08 10:14:08 +0000250 if ((r = sshkey_load_file(fd, buffer)) != 0 ||
tim@openbsd.org3c019a92015-09-13 14:39:16 +0000251 (r = sshkey_parse_private_fileblob(buffer, passphrase, keyp,
252 commentp)) != 0)
Damien Miller86687062014-07-02 15:28:02 +1000253 goto out;
markus@openbsd.org1b11ea72018-02-23 15:58:37 +0000254 if (keyp && *keyp &&
255 (r = sshkey_set_filename(*keyp, filename)) != 0)
256 goto out;
Damien Miller86687062014-07-02 15:28:02 +1000257 r = 0;
258 out:
259 close(fd);
mmcc@openbsd.org52d70782015-12-11 04:21:11 +0000260 sshbuf_free(buffer);
Damien Miller86687062014-07-02 15:28:02 +1000261 return r;
262}
263
264static int
265sshkey_try_load_public(struct sshkey *k, const char *filename, char **commentp)
266{
267 FILE *f;
markus@openbsd.org7f906352018-06-06 18:29:18 +0000268 char *line = NULL, *cp;
269 size_t linesize = 0;
Damien Miller86687062014-07-02 15:28:02 +1000270 int r;
271
272 if (commentp != NULL)
273 *commentp = NULL;
274 if ((f = fopen(filename, "r")) == NULL)
275 return SSH_ERR_SYSTEM_ERROR;
markus@openbsd.org7f906352018-06-06 18:29:18 +0000276 while (getline(&line, &linesize, f) != -1) {
Damien Miller86687062014-07-02 15:28:02 +1000277 cp = line;
278 switch (*cp) {
279 case '#':
280 case '\n':
281 case '\0':
282 continue;
283 }
284 /* Abort loading if this looks like a private key */
285 if (strncmp(cp, "-----BEGIN", 10) == 0 ||
286 strcmp(cp, "SSH PRIVATE KEY FILE") == 0)
287 break;
288 /* Skip leading whitespace. */
289 for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
290 ;
291 if (*cp) {
292 if ((r = sshkey_read(k, &cp)) == 0) {
293 cp[strcspn(cp, "\r\n")] = '\0';
294 if (commentp) {
295 *commentp = strdup(*cp ?
296 cp : filename);
297 if (*commentp == NULL)
298 r = SSH_ERR_ALLOC_FAIL;
299 }
markus@openbsd.org7f906352018-06-06 18:29:18 +0000300 free(line);
Damien Miller86687062014-07-02 15:28:02 +1000301 fclose(f);
302 return r;
303 }
304 }
305 }
markus@openbsd.org7f906352018-06-06 18:29:18 +0000306 free(line);
Damien Miller86687062014-07-02 15:28:02 +1000307 fclose(f);
308 return SSH_ERR_INVALID_FORMAT;
309}
310
markus@openbsd.orgafbfa682017-05-30 08:49:32 +0000311/* load public key from any pubkey file */
Damien Miller86687062014-07-02 15:28:02 +1000312int
313sshkey_load_public(const char *filename, struct sshkey **keyp, char **commentp)
314{
315 struct sshkey *pub = NULL;
markus@openbsd.orgafbfa682017-05-30 08:49:32 +0000316 char *file = NULL;
317 int r;
Damien Miller86687062014-07-02 15:28:02 +1000318
319 if (keyp != NULL)
320 *keyp = NULL;
321 if (commentp != NULL)
322 *commentp = NULL;
323
Damien Miller86687062014-07-02 15:28:02 +1000324 if ((pub = sshkey_new(KEY_UNSPEC)) == NULL)
325 return SSH_ERR_ALLOC_FAIL;
326 if ((r = sshkey_try_load_public(pub, filename, commentp)) == 0) {
markus@openbsd.orgafbfa682017-05-30 08:49:32 +0000327 if (keyp != NULL) {
Damien Miller86687062014-07-02 15:28:02 +1000328 *keyp = pub;
markus@openbsd.orgafbfa682017-05-30 08:49:32 +0000329 pub = NULL;
330 }
331 r = 0;
332 goto out;
Damien Miller86687062014-07-02 15:28:02 +1000333 }
334 sshkey_free(pub);
335
Damien Miller86687062014-07-02 15:28:02 +1000336 /* try .pub suffix */
markus@openbsd.orgafbfa682017-05-30 08:49:32 +0000337 if (asprintf(&file, "%s.pub", filename) == -1)
Damien Miller86687062014-07-02 15:28:02 +1000338 return SSH_ERR_ALLOC_FAIL;
markus@openbsd.orgafbfa682017-05-30 08:49:32 +0000339 if ((pub = sshkey_new(KEY_UNSPEC)) == NULL) {
340 r = SSH_ERR_ALLOC_FAIL;
341 goto out;
Damien Miller86687062014-07-02 15:28:02 +1000342 }
markus@openbsd.orgafbfa682017-05-30 08:49:32 +0000343 if ((r = sshkey_try_load_public(pub, file, commentp)) == 0) {
344 if (keyp != NULL) {
345 *keyp = pub;
346 pub = NULL;
347 }
348 r = 0;
349 }
350 out:
351 free(file);
Damien Miller86687062014-07-02 15:28:02 +1000352 sshkey_free(pub);
353 return r;
Damien Millere4340be2000-09-16 13:29:08 +1100354}
Damien Miller1aed65e2010-03-04 21:53:35 +1100355
Damien Millerc1583312010-08-05 13:04:50 +1000356/* Load the certificate associated with the named private key */
Damien Miller86687062014-07-02 15:28:02 +1000357int
358sshkey_load_cert(const char *filename, struct sshkey **keyp)
Damien Millerc1583312010-08-05 13:04:50 +1000359{
Damien Miller86687062014-07-02 15:28:02 +1000360 struct sshkey *pub = NULL;
361 char *file = NULL;
362 int r = SSH_ERR_INTERNAL_ERROR;
Damien Millerc1583312010-08-05 13:04:50 +1000363
djm@openbsd.orgdce19bf2016-04-09 12:39:30 +0000364 if (keyp != NULL)
365 *keyp = NULL;
Damien Miller86687062014-07-02 15:28:02 +1000366
367 if (asprintf(&file, "%s-cert.pub", filename) == -1)
368 return SSH_ERR_ALLOC_FAIL;
369
370 if ((pub = sshkey_new(KEY_UNSPEC)) == NULL) {
371 goto out;
Damien Miller5458c4d2010-08-05 13:05:15 +1000372 }
Damien Miller86687062014-07-02 15:28:02 +1000373 if ((r = sshkey_try_load_public(pub, file, NULL)) != 0)
374 goto out;
djm@openbsd.orgdce19bf2016-04-09 12:39:30 +0000375 /* success */
376 if (keyp != NULL) {
377 *keyp = pub;
378 pub = NULL;
379 }
Damien Miller86687062014-07-02 15:28:02 +1000380 r = 0;
Damien Miller86687062014-07-02 15:28:02 +1000381 out:
mmcc@openbsd.orgd59ce082015-12-10 17:08:40 +0000382 free(file);
mmcc@openbsd.org89540b62015-12-11 02:31:47 +0000383 sshkey_free(pub);
Damien Miller86687062014-07-02 15:28:02 +1000384 return r;
Damien Millerc1583312010-08-05 13:04:50 +1000385}
386
387/* Load private key and certificate */
Damien Miller86687062014-07-02 15:28:02 +1000388int
389sshkey_load_private_cert(int type, const char *filename, const char *passphrase,
390 struct sshkey **keyp, int *perm_ok)
Damien Millerc1583312010-08-05 13:04:50 +1000391{
Damien Miller86687062014-07-02 15:28:02 +1000392 struct sshkey *key = NULL, *cert = NULL;
393 int r;
394
djm@openbsd.orgdce19bf2016-04-09 12:39:30 +0000395 if (keyp != NULL)
396 *keyp = NULL;
Damien Millerc1583312010-08-05 13:04:50 +1000397
398 switch (type) {
Damien Miller1f0311c2014-05-15 14:24:09 +1000399#ifdef WITH_OPENSSL
Damien Millerc1583312010-08-05 13:04:50 +1000400 case KEY_RSA:
401 case KEY_DSA:
Damien Millereb8b60e2010-08-31 22:41:14 +1000402 case KEY_ECDSA:
Damien Miller86687062014-07-02 15:28:02 +1000403#endif /* WITH_OPENSSL */
markus@openbsd.org16db0a72015-07-09 09:49:46 +0000404 case KEY_ED25519:
markus@openbsd.org1b11ea72018-02-23 15:58:37 +0000405 case KEY_XMSS:
Damien Miller86687062014-07-02 15:28:02 +1000406 case KEY_UNSPEC:
Damien Millerc1583312010-08-05 13:04:50 +1000407 break;
408 default:
Damien Miller86687062014-07-02 15:28:02 +1000409 return SSH_ERR_KEY_TYPE_UNKNOWN;
Damien Millerc1583312010-08-05 13:04:50 +1000410 }
411
Damien Miller86687062014-07-02 15:28:02 +1000412 if ((r = sshkey_load_private_type(type, filename,
413 passphrase, &key, NULL, perm_ok)) != 0 ||
414 (r = sshkey_load_cert(filename, &cert)) != 0)
415 goto out;
Damien Millerc1583312010-08-05 13:04:50 +1000416
417 /* Make sure the private key matches the certificate */
Damien Miller86687062014-07-02 15:28:02 +1000418 if (sshkey_equal_public(key, cert) == 0) {
419 r = SSH_ERR_KEY_CERT_MISMATCH;
420 goto out;
Damien Millerc1583312010-08-05 13:04:50 +1000421 }
422
djm@openbsd.orgc28fc622015-07-03 03:43:18 +0000423 if ((r = sshkey_to_certified(key)) != 0 ||
Damien Miller86687062014-07-02 15:28:02 +1000424 (r = sshkey_cert_copy(cert, key)) != 0)
425 goto out;
426 r = 0;
djm@openbsd.orgdce19bf2016-04-09 12:39:30 +0000427 if (keyp != NULL) {
428 *keyp = key;
429 key = NULL;
430 }
Damien Miller86687062014-07-02 15:28:02 +1000431 out:
mmcc@openbsd.org89540b62015-12-11 02:31:47 +0000432 sshkey_free(key);
433 sshkey_free(cert);
Damien Miller86687062014-07-02 15:28:02 +1000434 return r;
Damien Millerc1583312010-08-05 13:04:50 +1000435}
436
Damien Miller1aed65e2010-03-04 21:53:35 +1100437/*
Damien Miller86687062014-07-02 15:28:02 +1000438 * Returns success if the specified "key" is listed in the file "filename",
439 * SSH_ERR_KEY_NOT_FOUND: if the key is not listed or another error.
djm@openbsd.org5e39a492014-12-04 02:24:32 +0000440 * If "strict_type" is set then the key type must match exactly,
Damien Miller1aed65e2010-03-04 21:53:35 +1100441 * otherwise a comparison that ignores certficiate data is performed.
djm@openbsd.org5e39a492014-12-04 02:24:32 +0000442 * If "check_ca" is set and "key" is a certificate, then its CA key is
443 * also checked and sshkey_in_file() will return success if either is found.
Damien Miller1aed65e2010-03-04 21:53:35 +1100444 */
445int
djm@openbsd.org5e39a492014-12-04 02:24:32 +0000446sshkey_in_file(struct sshkey *key, const char *filename, int strict_type,
447 int check_ca)
Damien Miller1aed65e2010-03-04 21:53:35 +1100448{
449 FILE *f;
markus@openbsd.org7f906352018-06-06 18:29:18 +0000450 char *line = NULL, *cp;
451 size_t linesize = 0;
Damien Miller86687062014-07-02 15:28:02 +1000452 int r = 0;
453 struct sshkey *pub = NULL;
markus@openbsd.org7f906352018-06-06 18:29:18 +0000454
Damien Miller86687062014-07-02 15:28:02 +1000455 int (*sshkey_compare)(const struct sshkey *, const struct sshkey *) =
456 strict_type ? sshkey_equal : sshkey_equal_public;
Damien Miller1aed65e2010-03-04 21:53:35 +1100457
djm@openbsd.org5e39a492014-12-04 02:24:32 +0000458 if ((f = fopen(filename, "r")) == NULL)
459 return SSH_ERR_SYSTEM_ERROR;
Damien Miller1aed65e2010-03-04 21:53:35 +1100460
markus@openbsd.org7f906352018-06-06 18:29:18 +0000461 while (getline(&line, &linesize, f) != -1) {
Damien Miller1aed65e2010-03-04 21:53:35 +1100462 cp = line;
463
464 /* Skip leading whitespace. */
465 for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
466 ;
467
468 /* Skip comments and empty lines */
469 switch (*cp) {
470 case '#':
471 case '\n':
472 case '\0':
473 continue;
474 }
475
Damien Miller86687062014-07-02 15:28:02 +1000476 if ((pub = sshkey_new(KEY_UNSPEC)) == NULL) {
477 r = SSH_ERR_ALLOC_FAIL;
478 goto out;
Damien Miller1aed65e2010-03-04 21:53:35 +1100479 }
Damien Miller86687062014-07-02 15:28:02 +1000480 if ((r = sshkey_read(pub, &cp)) != 0)
481 goto out;
djm@openbsd.org5e39a492014-12-04 02:24:32 +0000482 if (sshkey_compare(key, pub) ||
483 (check_ca && sshkey_is_cert(key) &&
484 sshkey_compare(key->cert->signature_key, pub))) {
Damien Miller86687062014-07-02 15:28:02 +1000485 r = 0;
486 goto out;
Damien Miller1aed65e2010-03-04 21:53:35 +1100487 }
Damien Miller86687062014-07-02 15:28:02 +1000488 sshkey_free(pub);
489 pub = NULL;
Damien Miller1aed65e2010-03-04 21:53:35 +1100490 }
Damien Miller86687062014-07-02 15:28:02 +1000491 r = SSH_ERR_KEY_NOT_FOUND;
492 out:
markus@openbsd.org7f906352018-06-06 18:29:18 +0000493 free(line);
mmcc@openbsd.org89540b62015-12-11 02:31:47 +0000494 sshkey_free(pub);
Damien Miller1aed65e2010-03-04 21:53:35 +1100495 fclose(f);
Damien Miller86687062014-07-02 15:28:02 +1000496 return r;
Damien Miller1aed65e2010-03-04 21:53:35 +1100497}
Damien Miller86687062014-07-02 15:28:02 +1000498
djm@openbsd.org5e39a492014-12-04 02:24:32 +0000499/*
500 * Checks whether the specified key is revoked, returning 0 if not,
501 * SSH_ERR_KEY_REVOKED if it is or another error code if something
502 * unexpected happened.
503 * This will check both the key and, if it is a certificate, its CA key too.
504 * "revoked_keys_file" may be a KRL or a one-per-line list of public keys.
505 */
506int
507sshkey_check_revoked(struct sshkey *key, const char *revoked_keys_file)
508{
509 int r;
510
djm@openbsd.org5e39a492014-12-04 02:24:32 +0000511 r = ssh_krl_file_contains_key(revoked_keys_file, key);
512 /* If this was not a KRL to begin with then continue below */
513 if (r != SSH_ERR_KRL_BAD_MAGIC)
514 return r;
djm@openbsd.org5e39a492014-12-04 02:24:32 +0000515
516 /*
517 * If the file is not a KRL or we can't handle KRLs then attempt to
518 * parse the file as a flat list of keys.
519 */
520 switch ((r = sshkey_in_file(key, revoked_keys_file, 0, 1))) {
521 case 0:
522 /* Key found => revoked */
523 return SSH_ERR_KEY_REVOKED;
524 case SSH_ERR_KEY_NOT_FOUND:
525 /* Key not found => not revoked */
526 return 0;
527 default:
528 /* Some other error occurred */
529 return r;
530 }
531}
532