1 /* $OpenBSD: ssh-add.c,v 1.83 2006/07/09 15:27:59 stevesk 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>
43 #include <openssl/evp.h>
55 #include "pathnames.h"
59 extern char *__progname;
61 /* Default files to add */
62 static char *default_files[] = {
63 _PATH_SSH_CLIENT_ID_RSA,
64 _PATH_SSH_CLIENT_ID_DSA,
65 _PATH_SSH_CLIENT_IDENTITY,
69 /* Default lifetime (0 == forever) */
70 static int lifetime = 0;
72 /* User has to confirm key use */
73 static int confirm = 0;
75 /* we keep a cache of one passphrases */
76 static char *pass = NULL;
81 memset(pass, 0, strlen(pass));
88 delete_file(AuthenticationConnection *ac, const char *filename)
94 public = key_load_public(filename, &comment);
96 printf("Bad key file %s\n", filename);
99 if (ssh_remove_identity(ac, public)) {
100 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
103 fprintf(stderr, "Could not remove identity: %s\n", filename);
111 /* Send a request to remove all identities. */
113 delete_all(AuthenticationConnection *ac)
117 if (ssh_remove_all_identities(ac, 1))
119 /* ignore error-code for ssh2 */
120 ssh_remove_all_identities(ac, 2);
123 fprintf(stderr, "All identities removed.\n");
125 fprintf(stderr, "Failed to remove all identities.\n");
131 add_file(AuthenticationConnection *ac, const char *filename)
134 char *comment = NULL;
136 int fd, perms_ok, ret = -1;
138 if ((fd = open(filename, O_RDONLY)) < 0) {
144 * Since we'll try to load a keyfile multiple times, permission errors
145 * will occur multiple times, so check perms first and bail if wrong.
147 perms_ok = key_perm_ok(fd, filename);
152 /* At first, try empty passphrase */
153 private = key_load_private(filename, "", &comment);
155 comment = xstrdup(filename);
157 if (private == NULL && pass != NULL)
158 private = key_load_private(filename, pass, NULL);
159 if (private == NULL) {
160 /* clear passphrase since it did not work */
162 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ",
165 pass = read_passphrase(msg, RP_ALLOW_STDIN);
166 if (strcmp(pass, "") == 0) {
171 private = key_load_private(filename, pass, &comment);
175 snprintf(msg, sizeof msg,
176 "Bad passphrase, try again for %.200s: ", comment);
180 if (ssh_add_identity_constrained(ac, private, comment, lifetime,
182 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
186 "Lifetime set to %d seconds\n", lifetime);
189 "The user has to confirm each use of the key\n");
190 } else if (ssh_add_identity(ac, private, comment)) {
191 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
194 fprintf(stderr, "Could not add identity: %s\n", filename);
204 update_card(AuthenticationConnection *ac, int add, const char *id)
209 pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
213 if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) {
214 fprintf(stderr, "Card %s: %s\n",
215 add ? "added" : "removed", id);
218 fprintf(stderr, "Could not %s card: %s\n",
219 add ? "add" : "remove", id);
227 list_identities(AuthenticationConnection *ac, int do_fp)
231 int had_identities = 0;
234 for (version = 1; version <= 2; version++) {
235 for (key = ssh_get_first_identity(ac, &comment, version);
237 key = ssh_get_next_identity(ac, &comment, version)) {
240 fp = key_fingerprint(key, SSH_FP_MD5,
242 printf("%d %s %s (%s)\n",
243 key_size(key), fp, comment, key_type(key));
246 if (!key_write(key, stdout))
247 fprintf(stderr, "key_write failed");
248 fprintf(stdout, " %s\n", comment);
254 if (!had_identities) {
255 printf("The agent has no identities.\n");
262 lock_agent(AuthenticationConnection *ac, int lock)
264 char prompt[100], *p1, *p2;
265 int passok = 1, ret = -1;
267 strlcpy(prompt, "Enter lock password: ", sizeof(prompt));
268 p1 = read_passphrase(prompt, RP_ALLOW_STDIN);
270 strlcpy(prompt, "Again: ", sizeof prompt);
271 p2 = read_passphrase(prompt, RP_ALLOW_STDIN);
272 if (strcmp(p1, p2) != 0) {
273 fprintf(stderr, "Passwords do not match.\n");
276 memset(p2, 0, strlen(p2));
279 if (passok && ssh_lock_agent(ac, lock, p1)) {
280 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un");
283 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un");
284 memset(p1, 0, strlen(p1));
290 do_file(AuthenticationConnection *ac, int deleting, char *file)
293 if (delete_file(ac, file) == -1)
296 if (add_file(ac, file) == -1)
305 fprintf(stderr, "Usage: %s [options] [file ...]\n", __progname);
306 fprintf(stderr, "Options:\n");
307 fprintf(stderr, " -l List fingerprints of all identities.\n");
308 fprintf(stderr, " -L List public key parameters of all identities.\n");
309 fprintf(stderr, " -d Delete identity.\n");
310 fprintf(stderr, " -D Delete all identities.\n");
311 fprintf(stderr, " -x Lock agent.\n");
312 fprintf(stderr, " -X Unlock agent.\n");
313 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n");
314 fprintf(stderr, " -c Require confirmation to sign using identities\n");
316 fprintf(stderr, " -s reader Add key in smartcard reader.\n");
317 fprintf(stderr, " -e reader Remove key in smartcard reader.\n");
322 main(int argc, char **argv)
326 AuthenticationConnection *ac = NULL;
327 char *sc_reader_id = NULL;
328 int i, ch, deleting = 0, ret = 0;
330 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
333 __progname = ssh_get_progname(argv[0]);
337 SSLeay_add_all_algorithms();
339 /* At first, get a connection to the authentication agent. */
340 ac = ssh_get_authentication_connection();
343 "Could not open a connection to your authentication agent.\n");
346 while ((ch = getopt(argc, argv, "lLcdDxXe:s:t:")) != -1) {
350 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1)
355 if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1)
365 if (delete_all(ac) == -1)
369 sc_reader_id = optarg;
373 sc_reader_id = optarg;
376 if ((lifetime = convtime(optarg)) == -1) {
377 fprintf(stderr, "Invalid lifetime\n");
390 if (sc_reader_id != NULL) {
391 if (update_card(ac, !deleting, sc_reader_id) == -1)
396 char buf[MAXPATHLEN];
401 if ((pw = getpwuid(getuid())) == NULL) {
402 fprintf(stderr, "No user found with uid %u\n",
408 for (i = 0; default_files[i]; i++) {
409 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir,
411 if (stat(buf, &st) < 0)
413 if (do_file(ac, deleting, buf) == -1)
421 for (i = 0; i < argc; i++) {
422 if (do_file(ac, deleting, argv[i]) == -1)
429 ssh_close_authentication_connection(ac);