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3c0ef626 1/*
2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
5 * Adds an identity to the authentication server, or removes an identity.
6 *
7 * As far as I am concerned, the code I have written for this software
8 * can be used freely for any purpose. Any derived versions of this
9 * software must be clearly marked as such, and if the derived work is
10 * incompatible with the protocol description in the RFC file, it must be
11 * called by a name other than "ssh" or "Secure Shell".
12 *
13 * SSH2 implementation,
14 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "includes.h"
f5799ae1 38RCSID("$OpenBSD: ssh-add.c,v 1.61 2002/06/19 00:27:55 deraadt Exp $");
3c0ef626 39
40#include <openssl/evp.h>
41
42#include "ssh.h"
43#include "rsa.h"
44#include "log.h"
45#include "xmalloc.h"
46#include "key.h"
47#include "authfd.h"
48#include "authfile.h"
49#include "pathnames.h"
50#include "readpass.h"
f5799ae1 51#include "misc.h"
3c0ef626 52
53#ifdef HAVE___PROGNAME
54extern char *__progname;
55#else
56char *__progname;
57#endif
58
59/* argv0 */
60extern char *__progname;
61
e9a17296 62/* Default files to add */
63static char *default_files[] = {
64 _PATH_SSH_CLIENT_ID_RSA,
65 _PATH_SSH_CLIENT_ID_DSA,
700318f3 66 _PATH_SSH_CLIENT_IDENTITY,
e9a17296 67 NULL
68};
69
f5799ae1 70/* Default lifetime (0 == forever) */
71static int lifetime = 0;
e9a17296 72
3c0ef626 73/* we keep a cache of one passphrases */
74static char *pass = NULL;
75static void
76clear_pass(void)
77{
78 if (pass) {
79 memset(pass, 0, strlen(pass));
80 xfree(pass);
81 pass = NULL;
82 }
83}
84
85static int
86delete_file(AuthenticationConnection *ac, const char *filename)
87{
88 Key *public;
89 char *comment = NULL;
90 int ret = -1;
91
92 public = key_load_public(filename, &comment);
93 if (public == NULL) {
94 printf("Bad key file %s\n", filename);
95 return -1;
96 }
97 if (ssh_remove_identity(ac, public)) {
98 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
99 ret = 0;
100 } else
101 fprintf(stderr, "Could not remove identity: %s\n", filename);
102
103 key_free(public);
104 xfree(comment);
e9a17296 105
3c0ef626 106 return ret;
107}
108
109/* Send a request to remove all identities. */
110static int
111delete_all(AuthenticationConnection *ac)
112{
113 int ret = -1;
114
115 if (ssh_remove_all_identities(ac, 1))
116 ret = 0;
117 /* ignore error-code for ssh2 */
118 ssh_remove_all_identities(ac, 2);
119
120 if (ret == 0)
121 fprintf(stderr, "All identities removed.\n");
122 else
123 fprintf(stderr, "Failed to remove all identities.\n");
124
125 return ret;
126}
127
128static int
129add_file(AuthenticationConnection *ac, const char *filename)
130{
131 struct stat st;
132 Key *private;
133 char *comment = NULL;
134 char msg[1024];
135 int ret = -1;
136
137 if (stat(filename, &st) < 0) {
138 perror(filename);
139 return -1;
140 }
141 /* At first, try empty passphrase */
142 private = key_load_private(filename, "", &comment);
143 if (comment == NULL)
144 comment = xstrdup(filename);
145 /* try last */
146 if (private == NULL && pass != NULL)
147 private = key_load_private(filename, pass, NULL);
148 if (private == NULL) {
149 /* clear passphrase since it did not work */
150 clear_pass();
151 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ",
152 comment);
153 for (;;) {
154 pass = read_passphrase(msg, RP_ALLOW_STDIN);
155 if (strcmp(pass, "") == 0) {
156 clear_pass();
157 xfree(comment);
158 return -1;
159 }
160 private = key_load_private(filename, pass, &comment);
161 if (private != NULL)
162 break;
163 clear_pass();
164 strlcpy(msg, "Bad passphrase, try again: ", sizeof msg);
165 }
166 }
f5799ae1 167
168 if (ssh_add_identity_constrained(ac, private, comment, lifetime)) {
3c0ef626 169 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
170 ret = 0;
f5799ae1 171 if (lifetime != 0)
172 fprintf(stderr,
173 "Lifetime set to %d seconds\n", lifetime);
174 } else if (ssh_add_identity(ac, private, comment)) {
175 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
176 ret = 0;
177 } else {
3c0ef626 178 fprintf(stderr, "Could not add identity: %s\n", filename);
f5799ae1 179 }
3c0ef626 180
181 xfree(comment);
182 key_free(private);
e9a17296 183
3c0ef626 184 return ret;
185}
186
187static int
188update_card(AuthenticationConnection *ac, int add, const char *id)
189{
700318f3 190 char *pin;
191
192 pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
193 if (pin == NULL)
194 return -1;
195
196 if (ssh_update_card(ac, add, id, pin)) {
3c0ef626 197 fprintf(stderr, "Card %s: %s\n",
e9a17296 198 add ? "added" : "removed", id);
3c0ef626 199 return 0;
200 } else {
201 fprintf(stderr, "Could not %s card: %s\n",
e9a17296 202 add ? "add" : "remove", id);
3c0ef626 203 return -1;
204 }
205}
206
e9a17296 207static int
3c0ef626 208list_identities(AuthenticationConnection *ac, int do_fp)
209{
210 Key *key;
211 char *comment, *fp;
212 int had_identities = 0;
213 int version;
214
215 for (version = 1; version <= 2; version++) {
216 for (key = ssh_get_first_identity(ac, &comment, version);
e9a17296 217 key != NULL;
218 key = ssh_get_next_identity(ac, &comment, version)) {
3c0ef626 219 had_identities = 1;
220 if (do_fp) {
221 fp = key_fingerprint(key, SSH_FP_MD5,
222 SSH_FP_HEX);
223 printf("%d %s %s (%s)\n",
224 key_size(key), fp, comment, key_type(key));
225 xfree(fp);
226 } else {
227 if (!key_write(key, stdout))
228 fprintf(stderr, "key_write failed");
229 fprintf(stdout, " %s\n", comment);
230 }
231 key_free(key);
232 xfree(comment);
233 }
234 }
e9a17296 235 if (!had_identities) {
3c0ef626 236 printf("The agent has no identities.\n");
e9a17296 237 return -1;
238 }
239 return 0;
240}
241
f5799ae1 242static int
243lock_agent(AuthenticationConnection *ac, int lock)
244{
245 char prompt[100], *p1, *p2;
246 int passok = 1, ret = -1;
247
248 strlcpy(prompt, "Enter lock password: ", sizeof(prompt));
249 p1 = read_passphrase(prompt, RP_ALLOW_STDIN);
250 if (lock) {
251 strlcpy(prompt, "Again: ", sizeof prompt);
252 p2 = read_passphrase(prompt, RP_ALLOW_STDIN);
253 if (strcmp(p1, p2) != 0) {
254 fprintf(stderr, "Passwords do not match.\n");
255 passok = 0;
256 }
257 memset(p2, 0, strlen(p2));
258 xfree(p2);
259 }
260 if (passok && ssh_lock_agent(ac, lock, p1)) {
261 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un");
262 ret = 0;
263 } else
264 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un");
265 memset(p1, 0, strlen(p1));
266 xfree(p1);
267 return -1;
268}
269
e9a17296 270static int
271do_file(AuthenticationConnection *ac, int deleting, char *file)
272{
273 if (deleting) {
274 if (delete_file(ac, file) == -1)
275 return -1;
276 } else {
277 if (add_file(ac, file) == -1)
278 return -1;
279 }
280 return 0;
3c0ef626 281}
282
283static void
284usage(void)
285{
286 fprintf(stderr, "Usage: %s [options]\n", __progname);
287 fprintf(stderr, "Options:\n");
288 fprintf(stderr, " -l List fingerprints of all identities.\n");
289 fprintf(stderr, " -L List public key parameters of all identities.\n");
290 fprintf(stderr, " -d Delete identity.\n");
291 fprintf(stderr, " -D Delete all identities.\n");
f5799ae1 292 fprintf(stderr, " -x Lock agent.\n");
293 fprintf(stderr, " -x Unlock agent.\n");
294 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n");
3c0ef626 295#ifdef SMARTCARD
296 fprintf(stderr, " -s reader Add key in smartcard reader.\n");
297 fprintf(stderr, " -e reader Remove key in smartcard reader.\n");
298#endif
299}
300
301int
302main(int argc, char **argv)
303{
304 extern char *optarg;
305 extern int optind;
306 AuthenticationConnection *ac = NULL;
3c0ef626 307 char *sc_reader_id = NULL;
308 int i, ch, deleting = 0, ret = 0;
309
310 __progname = get_progname(argv[0]);
311 init_rng();
312 seed_rng();
313
314 SSLeay_add_all_algorithms();
315
316 /* At first, get a connection to the authentication agent. */
317 ac = ssh_get_authentication_connection();
318 if (ac == NULL) {
319 fprintf(stderr, "Could not open a connection to your authentication agent.\n");
e9a17296 320 exit(2);
3c0ef626 321 }
f5799ae1 322 while ((ch = getopt(argc, argv, "lLdDxXe:s:t:")) != -1) {
3c0ef626 323 switch (ch) {
324 case 'l':
325 case 'L':
e9a17296 326 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1)
327 ret = 1;
3c0ef626 328 goto done;
329 break;
f5799ae1 330 case 'x':
331 case 'X':
332 if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1)
333 ret = 1;
334 goto done;
335 break;
3c0ef626 336 case 'd':
337 deleting = 1;
338 break;
339 case 'D':
340 if (delete_all(ac) == -1)
341 ret = 1;
342 goto done;
343 break;
344 case 's':
345 sc_reader_id = optarg;
346 break;
347 case 'e':
e9a17296 348 deleting = 1;
3c0ef626 349 sc_reader_id = optarg;
350 break;
f5799ae1 351 case 't':
352 if ((lifetime = convtime(optarg)) == -1) {
353 fprintf(stderr, "Invalid lifetime\n");
354 ret = 1;
355 goto done;
356 }
357 break;
3c0ef626 358 default:
359 usage();
360 ret = 1;
361 goto done;
362 }
363 }
364 argc -= optind;
365 argv += optind;
366 if (sc_reader_id != NULL) {
367 if (update_card(ac, !deleting, sc_reader_id) == -1)
368 ret = 1;
369 goto done;
370 }
371 if (argc == 0) {
e9a17296 372 char buf[MAXPATHLEN];
373 struct passwd *pw;
700318f3 374 struct stat st;
375 int count = 0;
e9a17296 376
377 if ((pw = getpwuid(getuid())) == NULL) {
3c0ef626 378 fprintf(stderr, "No user found with uid %u\n",
379 (u_int)getuid());
380 ret = 1;
381 goto done;
382 }
e9a17296 383
384 for(i = 0; default_files[i]; i++) {
700318f3 385 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir,
e9a17296 386 default_files[i]);
700318f3 387 if (stat(buf, &st) < 0)
388 continue;
e9a17296 389 if (do_file(ac, deleting, buf) == -1)
3c0ef626 390 ret = 1;
700318f3 391 else
392 count++;
3c0ef626 393 }
700318f3 394 if (count == 0)
395 ret = 1;
3c0ef626 396 } else {
e9a17296 397 for(i = 0; i < argc; i++) {
398 if (do_file(ac, deleting, argv[i]) == -1)
399 ret = 1;
3c0ef626 400 }
401 }
402 clear_pass();
403
404done:
405 ssh_close_authentication_connection(ac);
406 return ret;
407}
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