1 /* $OpenBSD: ssh-add.c,v 1.89 2006/08/03 03:34:42 deraadt Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * Adds an identity to the authentication server, or removes an identity.
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
14 * SSH2 implementation,
15 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 #include <sys/types.h>
42 #include <sys/param.h>
44 #include <openssl/evp.h>
61 #include "pathnames.h"
65 extern char *__progname;
67 /* Default files to add */
68 static char *default_files[] = {
69 _PATH_SSH_CLIENT_ID_RSA,
70 _PATH_SSH_CLIENT_ID_DSA,
71 _PATH_SSH_CLIENT_IDENTITY,
75 /* Default lifetime (0 == forever) */
76 static int lifetime = 0;
78 /* User has to confirm key use */
79 static int confirm = 0;
81 /* we keep a cache of one passphrases */
82 static char *pass = NULL;
87 memset(pass, 0, strlen(pass));
94 delete_file(AuthenticationConnection *ac, const char *filename)
100 public = key_load_public(filename, &comment);
101 if (public == NULL) {
102 printf("Bad key file %s\n", filename);
105 if (ssh_remove_identity(ac, public)) {
106 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
109 fprintf(stderr, "Could not remove identity: %s\n", filename);
117 /* Send a request to remove all identities. */
119 delete_all(AuthenticationConnection *ac)
123 if (ssh_remove_all_identities(ac, 1))
125 /* ignore error-code for ssh2 */
126 ssh_remove_all_identities(ac, 2);
129 fprintf(stderr, "All identities removed.\n");
131 fprintf(stderr, "Failed to remove all identities.\n");
137 add_file(AuthenticationConnection *ac, const char *filename)
140 char *comment = NULL;
142 int fd, perms_ok, ret = -1;
144 if ((fd = open(filename, O_RDONLY)) < 0) {
150 * Since we'll try to load a keyfile multiple times, permission errors
151 * will occur multiple times, so check perms first and bail if wrong.
153 perms_ok = key_perm_ok(fd, filename);
158 /* At first, try empty passphrase */
159 private = key_load_private(filename, "", &comment);
161 comment = xstrdup(filename);
163 if (private == NULL && pass != NULL)
164 private = key_load_private(filename, pass, NULL);
165 if (private == NULL) {
166 /* clear passphrase since it did not work */
168 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ",
171 pass = read_passphrase(msg, RP_ALLOW_STDIN);
172 if (strcmp(pass, "") == 0) {
177 private = key_load_private(filename, pass, &comment);
181 snprintf(msg, sizeof msg,
182 "Bad passphrase, try again for %.200s: ", comment);
186 if (ssh_add_identity_constrained(ac, private, comment, lifetime,
188 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
192 "Lifetime set to %d seconds\n", lifetime);
195 "The user has to confirm each use of the key\n");
196 } else if (ssh_add_identity(ac, private, comment)) {
197 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
200 fprintf(stderr, "Could not add identity: %s\n", filename);
210 update_card(AuthenticationConnection *ac, int add, const char *id)
215 pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
219 if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) {
220 fprintf(stderr, "Card %s: %s\n",
221 add ? "added" : "removed", id);
224 fprintf(stderr, "Could not %s card: %s\n",
225 add ? "add" : "remove", id);
233 list_identities(AuthenticationConnection *ac, int do_fp)
237 int had_identities = 0;
240 for (version = 1; version <= 2; version++) {
241 for (key = ssh_get_first_identity(ac, &comment, version);
243 key = ssh_get_next_identity(ac, &comment, version)) {
246 fp = key_fingerprint(key, SSH_FP_MD5,
248 printf("%d %s %s (%s)\n",
249 key_size(key), fp, comment, key_type(key));
252 if (!key_write(key, stdout))
253 fprintf(stderr, "key_write failed");
254 fprintf(stdout, " %s\n", comment);
260 if (!had_identities) {
261 printf("The agent has no identities.\n");
268 lock_agent(AuthenticationConnection *ac, int lock)
270 char prompt[100], *p1, *p2;
271 int passok = 1, ret = -1;
273 strlcpy(prompt, "Enter lock password: ", sizeof(prompt));
274 p1 = read_passphrase(prompt, RP_ALLOW_STDIN);
276 strlcpy(prompt, "Again: ", sizeof prompt);
277 p2 = read_passphrase(prompt, RP_ALLOW_STDIN);
278 if (strcmp(p1, p2) != 0) {
279 fprintf(stderr, "Passwords do not match.\n");
282 memset(p2, 0, strlen(p2));
285 if (passok && ssh_lock_agent(ac, lock, p1)) {
286 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un");
289 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un");
290 memset(p1, 0, strlen(p1));
296 do_file(AuthenticationConnection *ac, int deleting, char *file)
299 if (delete_file(ac, file) == -1)
302 if (add_file(ac, file) == -1)
311 fprintf(stderr, "Usage: %s [options] [file ...]\n", __progname);
312 fprintf(stderr, "Options:\n");
313 fprintf(stderr, " -l List fingerprints of all identities.\n");
314 fprintf(stderr, " -L List public key parameters of all identities.\n");
315 fprintf(stderr, " -d Delete identity.\n");
316 fprintf(stderr, " -D Delete all identities.\n");
317 fprintf(stderr, " -x Lock agent.\n");
318 fprintf(stderr, " -X Unlock agent.\n");
319 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n");
320 fprintf(stderr, " -c Require confirmation to sign using identities\n");
322 fprintf(stderr, " -s reader Add key in smartcard reader.\n");
323 fprintf(stderr, " -e reader Remove key in smartcard reader.\n");
328 main(int argc, char **argv)
332 AuthenticationConnection *ac = NULL;
333 char *sc_reader_id = NULL;
334 int i, ch, deleting = 0, ret = 0;
336 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
339 __progname = ssh_get_progname(argv[0]);
343 SSLeay_add_all_algorithms();
345 /* At first, get a connection to the authentication agent. */
346 ac = ssh_get_authentication_connection();
349 "Could not open a connection to your authentication agent.\n");
352 while ((ch = getopt(argc, argv, "lLcdDxXe:s:t:")) != -1) {
356 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1)
361 if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1)
371 if (delete_all(ac) == -1)
375 sc_reader_id = optarg;
379 sc_reader_id = optarg;
382 if ((lifetime = convtime(optarg)) == -1) {
383 fprintf(stderr, "Invalid lifetime\n");
396 if (sc_reader_id != NULL) {
397 if (update_card(ac, !deleting, sc_reader_id) == -1)
402 char buf[MAXPATHLEN];
407 if ((pw = getpwuid(getuid())) == NULL) {
408 fprintf(stderr, "No user found with uid %u\n",
414 for (i = 0; default_files[i]; i++) {
415 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir,
417 if (stat(buf, &st) < 0)
419 if (do_file(ac, deleting, buf) == -1)
427 for (i = 0; i < argc; i++) {
428 if (do_file(ac, deleting, argv[i]) == -1)
435 ssh_close_authentication_connection(ac);