1 /* $OpenBSD: ssh-add.c,v 1.100 2010/08/31 12:33:38 djm 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>
45 #include "openbsd-compat/openssl-compat.h"
63 #include "pathnames.h"
67 extern char *__progname;
69 /* Default files to add */
70 static char *default_files[] = {
71 _PATH_SSH_CLIENT_ID_RSA,
72 _PATH_SSH_CLIENT_ID_DSA,
73 #ifdef OPENSSL_HAS_ECC
74 _PATH_SSH_CLIENT_ID_ECDSA,
76 _PATH_SSH_CLIENT_IDENTITY,
80 /* Default lifetime (0 == forever) */
81 static int lifetime = 0;
83 /* User has to confirm key use */
84 static int confirm = 0;
86 /* we keep a cache of one passphrases */
87 static char *pass = NULL;
92 memset(pass, 0, strlen(pass));
99 delete_file(AuthenticationConnection *ac, const char *filename)
102 char *comment = NULL;
105 public = key_load_public(filename, &comment);
106 if (public == NULL) {
107 printf("Bad key file %s\n", filename);
110 if (ssh_remove_identity(ac, public)) {
111 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
114 fprintf(stderr, "Could not remove identity: %s\n", filename);
122 /* Send a request to remove all identities. */
124 delete_all(AuthenticationConnection *ac)
128 if (ssh_remove_all_identities(ac, 1))
130 /* ignore error-code for ssh2 */
131 ssh_remove_all_identities(ac, 2);
134 fprintf(stderr, "All identities removed.\n");
136 fprintf(stderr, "Failed to remove all identities.\n");
142 add_file(AuthenticationConnection *ac, const char *filename)
145 char *comment = NULL, *fp;
146 char msg[1024], *certpath;
147 int fd, perms_ok, ret = -1;
149 if ((fd = open(filename, O_RDONLY)) < 0) {
155 * Since we'll try to load a keyfile multiple times, permission errors
156 * will occur multiple times, so check perms first and bail if wrong.
158 perms_ok = key_perm_ok(fd, filename);
163 /* At first, try empty passphrase */
164 private = key_load_private(filename, "", &comment);
166 comment = xstrdup(filename);
168 if (private == NULL && pass != NULL)
169 private = key_load_private(filename, pass, NULL);
170 if (private == NULL) {
171 /* clear passphrase since it did not work */
173 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ",
176 pass = read_passphrase(msg, RP_ALLOW_STDIN);
177 if (strcmp(pass, "") == 0) {
182 private = key_load_private(filename, pass, &comment);
186 snprintf(msg, sizeof msg,
187 "Bad passphrase, try again for %.200s: ", comment);
190 if (blacklisted_key(private, &fp) == 1) {
191 fprintf(stderr, "Public key %s blacklisted (see "
192 "ssh-vulnkey(1)); refusing to add it\n", fp);
199 if (ssh_add_identity_constrained(ac, private, comment, lifetime,
201 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
205 "Lifetime set to %d seconds\n", lifetime);
208 "The user must confirm each use of the key\n");
210 fprintf(stderr, "Could not add identity: %s\n", filename);
214 /* Now try to add the certificate flavour too */
215 xasprintf(&certpath, "%s-cert.pub", filename);
216 if ((cert = key_load_public(certpath, NULL)) == NULL)
219 if (!key_equal_public(cert, private)) {
220 error("Certificate %s does not match private key %s",
226 /* Graft with private bits */
227 if (key_to_certified(private, key_cert_is_legacy(cert)) != 0) {
228 error("%s: key_to_certified failed", __func__);
232 key_cert_copy(cert, private);
235 if (!ssh_add_identity_constrained(ac, private, comment,
236 lifetime, confirm)) {
237 error("Certificate %s (%s) add failed", certpath,
238 private->cert->key_id);
240 fprintf(stderr, "Certificate added: %s (%s)\n", certpath,
241 private->cert->key_id);
243 fprintf(stderr, "Lifetime set to %d seconds\n", lifetime);
245 fprintf(stderr, "The user must confirm each use of the key\n");
255 update_card(AuthenticationConnection *ac, int add, const char *id)
260 pin = read_passphrase("Enter passphrase for PKCS#11: ", RP_ALLOW_STDIN);
264 if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) {
265 fprintf(stderr, "Card %s: %s\n",
266 add ? "added" : "removed", id);
269 fprintf(stderr, "Could not %s card: %s\n",
270 add ? "add" : "remove", id);
278 list_identities(AuthenticationConnection *ac, int do_fp)
282 int had_identities = 0;
285 for (version = 1; version <= 2; version++) {
286 for (key = ssh_get_first_identity(ac, &comment, version);
288 key = ssh_get_next_identity(ac, &comment, version)) {
291 fp = key_fingerprint(key, SSH_FP_MD5,
293 printf("%d %s %s (%s)\n",
294 key_size(key), fp, comment, key_type(key));
297 if (!key_write(key, stdout))
298 fprintf(stderr, "key_write failed");
299 fprintf(stdout, " %s\n", comment);
305 if (!had_identities) {
306 printf("The agent has no identities.\n");
313 lock_agent(AuthenticationConnection *ac, int lock)
315 char prompt[100], *p1, *p2;
316 int passok = 1, ret = -1;
318 strlcpy(prompt, "Enter lock password: ", sizeof(prompt));
319 p1 = read_passphrase(prompt, RP_ALLOW_STDIN);
321 strlcpy(prompt, "Again: ", sizeof prompt);
322 p2 = read_passphrase(prompt, RP_ALLOW_STDIN);
323 if (strcmp(p1, p2) != 0) {
324 fprintf(stderr, "Passwords do not match.\n");
327 memset(p2, 0, strlen(p2));
330 if (passok && ssh_lock_agent(ac, lock, p1)) {
331 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un");
334 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un");
335 memset(p1, 0, strlen(p1));
341 do_file(AuthenticationConnection *ac, int deleting, char *file)
344 if (delete_file(ac, file) == -1)
347 if (add_file(ac, file) == -1)
356 fprintf(stderr, "usage: %s [options] [file ...]\n", __progname);
357 fprintf(stderr, "Options:\n");
358 fprintf(stderr, " -l List fingerprints of all identities.\n");
359 fprintf(stderr, " -L List public key parameters of all identities.\n");
360 fprintf(stderr, " -d Delete identity.\n");
361 fprintf(stderr, " -D Delete all identities.\n");
362 fprintf(stderr, " -x Lock agent.\n");
363 fprintf(stderr, " -X Unlock agent.\n");
364 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n");
365 fprintf(stderr, " -c Require confirmation to sign using identities\n");
366 fprintf(stderr, " -s pkcs11 Add keys from PKCS#11 provider.\n");
367 fprintf(stderr, " -e pkcs11 Remove keys provided by PKCS#11 provider.\n");
371 main(int argc, char **argv)
375 AuthenticationConnection *ac = NULL;
376 char *pkcs11provider = NULL;
377 int i, ch, deleting = 0, ret = 0;
379 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
382 __progname = ssh_get_progname(argv[0]);
386 OpenSSL_add_all_algorithms();
388 /* At first, get a connection to the authentication agent. */
389 ac = ssh_get_authentication_connection();
392 "Could not open a connection to your authentication agent.\n");
395 while ((ch = getopt(argc, argv, "lLcdDxXe:s:t:")) != -1) {
399 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1)
404 if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1)
414 if (delete_all(ac) == -1)
418 pkcs11provider = optarg;
422 pkcs11provider = optarg;
425 if ((lifetime = convtime(optarg)) == -1) {
426 fprintf(stderr, "Invalid lifetime\n");
439 if (pkcs11provider != NULL) {
440 if (update_card(ac, !deleting, pkcs11provider) == -1)
445 char buf[MAXPATHLEN];
450 if ((pw = getpwuid(getuid())) == NULL) {
451 fprintf(stderr, "No user found with uid %u\n",
457 for (i = 0; default_files[i]; i++) {
458 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir,
460 if (stat(buf, &st) < 0)
462 if (do_file(ac, deleting, buf) == -1)
470 for (i = 0; i < argc; i++) {
471 if (do_file(ac, deleting, argv[i]) == -1)
478 ssh_close_authentication_connection(ac);