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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 | 38 | RCSID("$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 | |
54 | extern char *__progname; | |
55 | #else | |
56 | char *__progname; | |
57 | #endif | |
58 | ||
59 | /* argv0 */ | |
60 | extern char *__progname; | |
61 | ||
e9a17296 | 62 | /* Default files to add */ |
63 | static 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) */ |
71 | static int lifetime = 0; | |
e9a17296 | 72 | |
3c0ef626 | 73 | /* we keep a cache of one passphrases */ |
74 | static char *pass = NULL; | |
75 | static void | |
76 | clear_pass(void) | |
77 | { | |
78 | if (pass) { | |
79 | memset(pass, 0, strlen(pass)); | |
80 | xfree(pass); | |
81 | pass = NULL; | |
82 | } | |
83 | } | |
84 | ||
85 | static int | |
86 | delete_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. */ | |
110 | static int | |
111 | delete_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 | ||
128 | static int | |
129 | add_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 | ||
187 | static int | |
188 | update_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 | 207 | static int |
3c0ef626 | 208 | list_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 | 242 | static int |
243 | lock_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 | 270 | static int |
271 | do_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 | ||
283 | static void | |
284 | usage(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 | ||
301 | int | |
302 | main(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 | ||
404 | done: | |
405 | ssh_close_authentication_connection(ac); | |
406 | return ret; | |
407 | } |