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657939aa | 1 | /* $OpenBSD: ssh-add.c,v 1.83 2006/07/09 15:27:59 stevesk Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
5260325f | 6 | * Adds an identity to the authentication server, or removes an identity. |
2e73a022 | 7 | * |
bcbf86ec | 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". | |
13 | * | |
2e73a022 | 14 | * SSH2 implementation, |
a96070d4 | 15 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 16 | * |
17 | * Redistribution and use in source and binary forms, with or without | |
18 | * modification, are permitted provided that the following conditions | |
19 | * are met: | |
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. | |
25 | * | |
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. | |
5260325f | 36 | */ |
8efc0c15 | 37 | |
38 | #include "includes.h" | |
4095f623 | 39 | |
40 | #include <sys/types.h> | |
41 | #include <sys/stat.h> | |
8efc0c15 | 42 | |
2e73a022 | 43 | #include <openssl/evp.h> |
a306f2dd | 44 | |
d3221cca | 45 | #include <fcntl.h> |
b1842393 | 46 | #include <pwd.h> |
47 | ||
8efc0c15 | 48 | #include "ssh.h" |
42f11eb2 | 49 | #include "rsa.h" |
50 | #include "log.h" | |
8efc0c15 | 51 | #include "xmalloc.h" |
a306f2dd | 52 | #include "key.h" |
4c8722d9 | 53 | #include "authfd.h" |
a306f2dd | 54 | #include "authfile.h" |
42f11eb2 | 55 | #include "pathnames.h" |
c3baacd1 | 56 | #include "misc.h" |
8efc0c15 | 57 | |
33e766d2 | 58 | /* argv0 */ |
59 | extern char *__progname; | |
60 | ||
67656ffc | 61 | /* Default files to add */ |
62 | static char *default_files[] = { | |
63 | _PATH_SSH_CLIENT_ID_RSA, | |
64 | _PATH_SSH_CLIENT_ID_DSA, | |
762715ce | 65 | _PATH_SSH_CLIENT_IDENTITY, |
67656ffc | 66 | NULL |
67 | }; | |
68 | ||
264572cc | 69 | /* Default lifetime (0 == forever) */ |
c3baacd1 | 70 | static int lifetime = 0; |
67656ffc | 71 | |
c4087616 | 72 | /* User has to confirm key use */ |
73 | static int confirm = 0; | |
74 | ||
a8666d84 | 75 | /* we keep a cache of one passphrases */ |
76 | static char *pass = NULL; | |
396c147e | 77 | static void |
a8666d84 | 78 | clear_pass(void) |
79 | { | |
80 | if (pass) { | |
81 | memset(pass, 0, strlen(pass)); | |
82 | xfree(pass); | |
83 | pass = NULL; | |
84 | } | |
85 | } | |
86 | ||
e0543e42 | 87 | static int |
5068f573 | 88 | delete_file(AuthenticationConnection *ac, const char *filename) |
8efc0c15 | 89 | { |
a306f2dd | 90 | Key *public; |
d64050ef | 91 | char *comment = NULL; |
e0543e42 | 92 | int ret = -1; |
5260325f | 93 | |
aeaa3d9e | 94 | public = key_load_public(filename, &comment); |
95 | if (public == NULL) { | |
96 | printf("Bad key file %s\n", filename); | |
e0543e42 | 97 | return -1; |
5260325f | 98 | } |
e0543e42 | 99 | if (ssh_remove_identity(ac, public)) { |
5260325f | 100 | fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); |
e0543e42 | 101 | ret = 0; |
102 | } else | |
5260325f | 103 | fprintf(stderr, "Could not remove identity: %s\n", filename); |
e0543e42 | 104 | |
a306f2dd | 105 | key_free(public); |
5260325f | 106 | xfree(comment); |
184eed6a | 107 | |
e0543e42 | 108 | return ret; |
8efc0c15 | 109 | } |
110 | ||
2e73a022 | 111 | /* Send a request to remove all identities. */ |
e0543e42 | 112 | static int |
5068f573 | 113 | delete_all(AuthenticationConnection *ac) |
8efc0c15 | 114 | { |
e0543e42 | 115 | int ret = -1; |
2e73a022 | 116 | |
e0543e42 | 117 | if (ssh_remove_all_identities(ac, 1)) |
118 | ret = 0; | |
2e73a022 | 119 | /* ignore error-code for ssh2 */ |
120 | ssh_remove_all_identities(ac, 2); | |
121 | ||
e0543e42 | 122 | if (ret == 0) |
5260325f | 123 | fprintf(stderr, "All identities removed.\n"); |
124 | else | |
b5c334cc | 125 | fprintf(stderr, "Failed to remove all identities.\n"); |
e0543e42 | 126 | |
127 | return ret; | |
8efc0c15 | 128 | } |
129 | ||
e0543e42 | 130 | static int |
5068f573 | 131 | add_file(AuthenticationConnection *ac, const char *filename) |
8efc0c15 | 132 | { |
a306f2dd | 133 | Key *private; |
561e5254 | 134 | char *comment = NULL; |
135 | char msg[1024]; | |
45660a22 | 136 | int fd, perms_ok, ret = -1; |
5260325f | 137 | |
657939aa | 138 | if ((fd = open(filename, O_RDONLY)) < 0) { |
2e73a022 | 139 | perror(filename); |
e0543e42 | 140 | return -1; |
2e73a022 | 141 | } |
45660a22 | 142 | |
143 | /* | |
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. | |
146 | */ | |
147 | perms_ok = key_perm_ok(fd, filename); | |
148 | close(fd); | |
149 | if (!perms_ok) | |
150 | return -1; | |
151 | ||
5260325f | 152 | /* At first, try empty passphrase */ |
aeaa3d9e | 153 | private = key_load_private(filename, "", &comment); |
154 | if (comment == NULL) | |
155 | comment = xstrdup(filename); | |
a8666d84 | 156 | /* try last */ |
157 | if (private == NULL && pass != NULL) | |
158 | private = key_load_private(filename, pass, NULL); | |
aeaa3d9e | 159 | if (private == NULL) { |
a8666d84 | 160 | /* clear passphrase since it did not work */ |
161 | clear_pass(); | |
065604bb | 162 | snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", |
4e2e5cfd | 163 | comment); |
aa3378df | 164 | for (;;) { |
1843a425 | 165 | pass = read_passphrase(msg, RP_ALLOW_STDIN); |
5260325f | 166 | if (strcmp(pass, "") == 0) { |
eae942e2 | 167 | clear_pass(); |
aeaa3d9e | 168 | xfree(comment); |
e0543e42 | 169 | return -1; |
5260325f | 170 | } |
aeaa3d9e | 171 | private = key_load_private(filename, pass, &comment); |
aeaa3d9e | 172 | if (private != NULL) |
5260325f | 173 | break; |
a8666d84 | 174 | clear_pass(); |
360a4aae | 175 | snprintf(msg, sizeof msg, |
176 | "Bad passphrase, try again for %.200s: ", comment); | |
5260325f | 177 | } |
178 | } | |
ee900f87 | 179 | |
aff51935 | 180 | if (ssh_add_identity_constrained(ac, private, comment, lifetime, |
181 | confirm)) { | |
aeaa3d9e | 182 | fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); |
e0543e42 | 183 | ret = 0; |
ee900f87 | 184 | if (lifetime != 0) |
b77a87e5 | 185 | fprintf(stderr, |
ee900f87 | 186 | "Lifetime set to %d seconds\n", lifetime); |
aff51935 | 187 | if (confirm != 0) |
c4087616 | 188 | fprintf(stderr, |
189 | "The user has to confirm each use of the key\n"); | |
ee900f87 | 190 | } else if (ssh_add_identity(ac, private, comment)) { |
191 | fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); | |
192 | ret = 0; | |
193 | } else { | |
5260325f | 194 | fprintf(stderr, "Could not add identity: %s\n", filename); |
264572cc | 195 | } |
196 | ||
aeaa3d9e | 197 | xfree(comment); |
a306f2dd | 198 | key_free(private); |
184eed6a | 199 | |
e0543e42 | 200 | return ret; |
8efc0c15 | 201 | } |
202 | ||
e0543e42 | 203 | static int |
9ff6f66f | 204 | update_card(AuthenticationConnection *ac, int add, const char *id) |
983def13 | 205 | { |
76139bd8 | 206 | char *pin; |
3e2f2431 | 207 | int ret = -1; |
76139bd8 | 208 | |
209 | pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); | |
210 | if (pin == NULL) | |
211 | return -1; | |
212 | ||
ca719034 | 213 | if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) { |
9ff6f66f | 214 | fprintf(stderr, "Card %s: %s\n", |
184eed6a | 215 | add ? "added" : "removed", id); |
3e2f2431 | 216 | ret = 0; |
e0543e42 | 217 | } else { |
9ff6f66f | 218 | fprintf(stderr, "Could not %s card: %s\n", |
184eed6a | 219 | add ? "add" : "remove", id); |
3e2f2431 | 220 | ret = -1; |
e0543e42 | 221 | } |
3e2f2431 | 222 | xfree(pin); |
223 | return ret; | |
983def13 | 224 | } |
225 | ||
a2863956 | 226 | static int |
22138a36 | 227 | list_identities(AuthenticationConnection *ac, int do_fp) |
8efc0c15 | 228 | { |
2e73a022 | 229 | Key *key; |
22138a36 | 230 | char *comment, *fp; |
2e73a022 | 231 | int had_identities = 0; |
232 | int version; | |
233 | ||
234 | for (version = 1; version <= 2; version++) { | |
235 | for (key = ssh_get_first_identity(ac, &comment, version); | |
184eed6a | 236 | key != NULL; |
237 | key = ssh_get_next_identity(ac, &comment, version)) { | |
2e73a022 | 238 | had_identities = 1; |
22138a36 | 239 | if (do_fp) { |
240 | fp = key_fingerprint(key, SSH_FP_MD5, | |
241 | SSH_FP_HEX); | |
fa08c86b | 242 | printf("%d %s %s (%s)\n", |
22138a36 | 243 | key_size(key), fp, comment, key_type(key)); |
244 | xfree(fp); | |
5260325f | 245 | } else { |
2e73a022 | 246 | if (!key_write(key, stdout)) |
247 | fprintf(stderr, "key_write failed"); | |
248 | fprintf(stdout, " %s\n", comment); | |
5260325f | 249 | } |
2e73a022 | 250 | key_free(key); |
251 | xfree(comment); | |
5260325f | 252 | } |
f095fcc7 | 253 | } |
a2863956 | 254 | if (!had_identities) { |
5260325f | 255 | printf("The agent has no identities.\n"); |
a2863956 | 256 | return -1; |
257 | } | |
258 | return 0; | |
8efc0c15 | 259 | } |
260 | ||
3db7f994 | 261 | static int |
262 | lock_agent(AuthenticationConnection *ac, int lock) | |
263 | { | |
264 | char prompt[100], *p1, *p2; | |
265 | int passok = 1, ret = -1; | |
7203d6bb | 266 | |
3db7f994 | 267 | strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); |
268 | p1 = read_passphrase(prompt, RP_ALLOW_STDIN); | |
269 | if (lock) { | |
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"); | |
274 | passok = 0; | |
275 | } | |
276 | memset(p2, 0, strlen(p2)); | |
277 | xfree(p2); | |
278 | } | |
279 | if (passok && ssh_lock_agent(ac, lock, p1)) { | |
280 | fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); | |
281 | ret = 0; | |
282 | } else | |
283 | fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); | |
284 | memset(p1, 0, strlen(p1)); | |
285 | xfree(p1); | |
1431a900 | 286 | return (ret); |
3db7f994 | 287 | } |
288 | ||
67656ffc | 289 | static int |
290 | do_file(AuthenticationConnection *ac, int deleting, char *file) | |
291 | { | |
292 | if (deleting) { | |
293 | if (delete_file(ac, file) == -1) | |
294 | return -1; | |
295 | } else { | |
296 | if (add_file(ac, file) == -1) | |
297 | return -1; | |
298 | } | |
299 | return 0; | |
300 | } | |
301 | ||
983def13 | 302 | static void |
303 | usage(void) | |
304 | { | |
f9579ee9 | 305 | fprintf(stderr, "Usage: %s [options] [file ...]\n", __progname); |
33e766d2 | 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"); | |
73861c4e | 311 | fprintf(stderr, " -x Lock agent.\n"); |
c7724abb | 312 | fprintf(stderr, " -X Unlock agent.\n"); |
264572cc | 313 | fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); |
c4087616 | 314 | fprintf(stderr, " -c Require confirmation to sign using identities\n"); |
33e766d2 | 315 | #ifdef SMARTCARD |
316 | fprintf(stderr, " -s reader Add key in smartcard reader.\n"); | |
317 | fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); | |
318 | #endif | |
983def13 | 319 | } |
320 | ||
8efc0c15 | 321 | int |
5068f573 | 322 | main(int argc, char **argv) |
8efc0c15 | 323 | { |
34e02b83 | 324 | extern char *optarg; |
325 | extern int optind; | |
5260325f | 326 | AuthenticationConnection *ac = NULL; |
9ff6f66f | 327 | char *sc_reader_id = NULL; |
e0543e42 | 328 | int i, ch, deleting = 0, ret = 0; |
5260325f | 329 | |
fd6168c1 | 330 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
331 | sanitise_stdfd(); | |
332 | ||
fda04d7d | 333 | __progname = ssh_get_progname(argv[0]); |
264dce47 | 334 | init_rng(); |
044b0662 | 335 | seed_rng(); |
264dce47 | 336 | |
2b87da3b | 337 | SSLeay_add_all_algorithms(); |
2e73a022 | 338 | |
5260325f | 339 | /* At first, get a connection to the authentication agent. */ |
340 | ac = ssh_get_authentication_connection(); | |
341 | if (ac == NULL) { | |
932ab351 | 342 | fprintf(stderr, |
343 | "Could not open a connection to your authentication agent.\n"); | |
a2863956 | 344 | exit(2); |
8efc0c15 | 345 | } |
c4087616 | 346 | while ((ch = getopt(argc, argv, "lLcdDxXe:s:t:")) != -1) { |
34e02b83 | 347 | switch (ch) { |
348 | case 'l': | |
349 | case 'L': | |
a2863956 | 350 | if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) |
351 | ret = 1; | |
34e02b83 | 352 | goto done; |
3db7f994 | 353 | case 'x': |
354 | case 'X': | |
355 | if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) | |
356 | ret = 1; | |
357 | goto done; | |
c4087616 | 358 | case 'c': |
359 | confirm = 1; | |
360 | break; | |
34e02b83 | 361 | case 'd': |
5260325f | 362 | deleting = 1; |
34e02b83 | 363 | break; |
364 | case 'D': | |
e0543e42 | 365 | if (delete_all(ac) == -1) |
366 | ret = 1; | |
34e02b83 | 367 | goto done; |
34e02b83 | 368 | case 's': |
9ff6f66f | 369 | sc_reader_id = optarg; |
34e02b83 | 370 | break; |
371 | case 'e': | |
184eed6a | 372 | deleting = 1; |
9ff6f66f | 373 | sc_reader_id = optarg; |
34e02b83 | 374 | break; |
264572cc | 375 | case 't': |
c3baacd1 | 376 | if ((lifetime = convtime(optarg)) == -1) { |
377 | fprintf(stderr, "Invalid lifetime\n"); | |
378 | ret = 1; | |
379 | goto done; | |
380 | } | |
264572cc | 381 | break; |
34e02b83 | 382 | default: |
383 | usage(); | |
e0543e42 | 384 | ret = 1; |
385 | goto done; | |
983def13 | 386 | } |
8efc0c15 | 387 | } |
34e02b83 | 388 | argc -= optind; |
389 | argv += optind; | |
9ff6f66f | 390 | if (sc_reader_id != NULL) { |
e0543e42 | 391 | if (update_card(ac, !deleting, sc_reader_id) == -1) |
392 | ret = 1; | |
34e02b83 | 393 | goto done; |
983def13 | 394 | } |
34e02b83 | 395 | if (argc == 0) { |
67656ffc | 396 | char buf[MAXPATHLEN]; |
397 | struct passwd *pw; | |
256debd0 | 398 | struct stat st; |
399 | int count = 0; | |
67656ffc | 400 | |
401 | if ((pw = getpwuid(getuid())) == NULL) { | |
14a9a859 | 402 | fprintf(stderr, "No user found with uid %u\n", |
403 | (u_int)getuid()); | |
e0543e42 | 404 | ret = 1; |
405 | goto done; | |
5260325f | 406 | } |
67656ffc | 407 | |
f8cc7664 | 408 | for (i = 0; default_files[i]; i++) { |
762715ce | 409 | snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, |
67656ffc | 410 | default_files[i]); |
256debd0 | 411 | if (stat(buf, &st) < 0) |
412 | continue; | |
67656ffc | 413 | if (do_file(ac, deleting, buf) == -1) |
e0543e42 | 414 | ret = 1; |
256debd0 | 415 | else |
416 | count++; | |
e0543e42 | 417 | } |
256debd0 | 418 | if (count == 0) |
419 | ret = 1; | |
34e02b83 | 420 | } else { |
f8cc7664 | 421 | for (i = 0; i < argc; i++) { |
0e0bba68 | 422 | if (do_file(ac, deleting, argv[i]) == -1) |
67656ffc | 423 | ret = 1; |
34e02b83 | 424 | } |
8efc0c15 | 425 | } |
a8666d84 | 426 | clear_pass(); |
34e02b83 | 427 | |
428 | done: | |
5260325f | 429 | ssh_close_authentication_connection(ac); |
e0543e42 | 430 | return ret; |
8efc0c15 | 431 | } |