1 /* $OpenBSD: ssh-add.c,v 1.103 2011/10/18 23:37:42 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, int key_only)
145 char *comment = NULL;
146 char msg[1024], *certpath = NULL;
147 int fd, perms_ok, ret = -1;
150 if (strcmp(filename, "-") == 0) {
152 filename = "(stdin)";
153 } else if ((fd = open(filename, O_RDONLY)) < 0) {
159 * Since we'll try to load a keyfile multiple times, permission errors
160 * will occur multiple times, so check perms first and bail if wrong.
162 if (fd != STDIN_FILENO) {
163 perms_ok = key_perm_ok(fd, filename);
169 buffer_init(&keyblob);
170 if (!key_load_file(fd, filename, &keyblob)) {
171 buffer_free(&keyblob);
177 /* At first, try empty passphrase */
178 private = key_parse_private(&keyblob, filename, "", &comment);
180 comment = xstrdup(filename);
182 if (private == NULL && pass != NULL)
183 private = key_parse_private(&keyblob, filename, pass, NULL);
184 if (private == NULL) {
185 /* clear passphrase since it did not work */
187 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ",
190 pass = read_passphrase(msg, RP_ALLOW_STDIN);
191 if (strcmp(pass, "") == 0) {
194 buffer_free(&keyblob);
197 private = key_parse_private(&keyblob, filename, pass,
202 snprintf(msg, sizeof msg,
203 "Bad passphrase, try again for %.200s: ", comment);
206 buffer_free(&keyblob);
208 if (ssh_add_identity_constrained(ac, private, comment, lifetime,
210 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
214 "Lifetime set to %d seconds\n", lifetime);
217 "The user must confirm each use of the key\n");
219 fprintf(stderr, "Could not add identity: %s\n", filename);
222 /* Skip trying to load the cert if requested */
226 /* Now try to add the certificate flavour too */
227 xasprintf(&certpath, "%s-cert.pub", filename);
228 if ((cert = key_load_public(certpath, NULL)) == NULL)
231 if (!key_equal_public(cert, private)) {
232 error("Certificate %s does not match private key %s",
238 /* Graft with private bits */
239 if (key_to_certified(private, key_cert_is_legacy(cert)) != 0) {
240 error("%s: key_to_certified failed", __func__);
244 key_cert_copy(cert, private);
247 if (!ssh_add_identity_constrained(ac, private, comment,
248 lifetime, confirm)) {
249 error("Certificate %s (%s) add failed", certpath,
250 private->cert->key_id);
252 fprintf(stderr, "Certificate added: %s (%s)\n", certpath,
253 private->cert->key_id);
255 fprintf(stderr, "Lifetime set to %d seconds\n", lifetime);
257 fprintf(stderr, "The user must confirm each use of the key\n");
259 if (certpath != NULL)
268 update_card(AuthenticationConnection *ac, int add, const char *id)
273 pin = read_passphrase("Enter passphrase for PKCS#11: ", RP_ALLOW_STDIN);
277 if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) {
278 fprintf(stderr, "Card %s: %s\n",
279 add ? "added" : "removed", id);
282 fprintf(stderr, "Could not %s card: %s\n",
283 add ? "add" : "remove", id);
291 list_identities(AuthenticationConnection *ac, int do_fp)
295 int had_identities = 0;
298 for (version = 1; version <= 2; version++) {
299 for (key = ssh_get_first_identity(ac, &comment, version);
301 key = ssh_get_next_identity(ac, &comment, version)) {
304 fp = key_fingerprint(key, SSH_FP_MD5,
306 printf("%d %s %s (%s)\n",
307 key_size(key), fp, comment, key_type(key));
310 if (!key_write(key, stdout))
311 fprintf(stderr, "key_write failed");
312 fprintf(stdout, " %s\n", comment);
318 if (!had_identities) {
319 printf("The agent has no identities.\n");
326 lock_agent(AuthenticationConnection *ac, int lock)
328 char prompt[100], *p1, *p2;
329 int passok = 1, ret = -1;
331 strlcpy(prompt, "Enter lock password: ", sizeof(prompt));
332 p1 = read_passphrase(prompt, RP_ALLOW_STDIN);
334 strlcpy(prompt, "Again: ", sizeof prompt);
335 p2 = read_passphrase(prompt, RP_ALLOW_STDIN);
336 if (strcmp(p1, p2) != 0) {
337 fprintf(stderr, "Passwords do not match.\n");
340 memset(p2, 0, strlen(p2));
343 if (passok && ssh_lock_agent(ac, lock, p1)) {
344 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un");
347 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un");
348 memset(p1, 0, strlen(p1));
354 do_file(AuthenticationConnection *ac, int deleting, int key_only, char *file)
357 if (delete_file(ac, file) == -1)
360 if (add_file(ac, file, key_only) == -1)
369 fprintf(stderr, "usage: %s [options] [file ...]\n", __progname);
370 fprintf(stderr, "Options:\n");
371 fprintf(stderr, " -l List fingerprints of all identities.\n");
372 fprintf(stderr, " -L List public key parameters of all identities.\n");
373 fprintf(stderr, " -k Load only keys and not certificates.\n");
374 fprintf(stderr, " -c Require confirmation to sign using identities\n");
375 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n");
376 fprintf(stderr, " -d Delete identity.\n");
377 fprintf(stderr, " -D Delete all identities.\n");
378 fprintf(stderr, " -x Lock agent.\n");
379 fprintf(stderr, " -X Unlock agent.\n");
380 fprintf(stderr, " -s pkcs11 Add keys from PKCS#11 provider.\n");
381 fprintf(stderr, " -e pkcs11 Remove keys provided by PKCS#11 provider.\n");
385 main(int argc, char **argv)
389 AuthenticationConnection *ac = NULL;
390 char *pkcs11provider = NULL;
391 int i, ch, deleting = 0, ret = 0, key_only = 0;
393 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
396 __progname = ssh_get_progname(argv[0]);
399 OpenSSL_add_all_algorithms();
401 /* At first, get a connection to the authentication agent. */
402 ac = ssh_get_authentication_connection();
405 "Could not open a connection to your authentication agent.\n");
408 while ((ch = getopt(argc, argv, "klLcdDxXe:s:t:")) != -1) {
415 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1)
420 if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1)
430 if (delete_all(ac) == -1)
434 pkcs11provider = optarg;
438 pkcs11provider = optarg;
441 if ((lifetime = convtime(optarg)) == -1) {
442 fprintf(stderr, "Invalid lifetime\n");
455 if (pkcs11provider != NULL) {
456 if (update_card(ac, !deleting, pkcs11provider) == -1)
461 char buf[MAXPATHLEN];
466 if ((pw = getpwuid(getuid())) == NULL) {
467 fprintf(stderr, "No user found with uid %u\n",
473 for (i = 0; default_files[i]; i++) {
474 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir,
476 if (stat(buf, &st) < 0)
478 if (do_file(ac, deleting, key_only, buf) == -1)
486 for (i = 0; i < argc; i++) {
487 if (do_file(ac, deleting, key_only, argv[i]) == -1)
494 ssh_close_authentication_connection(ac);