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1 | /* $OpenBSD: ssh-add.c,v 1.85 2006/07/22 20:48:23 stevesk Exp $ */ | |
2 | /* | |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
6 | * Adds an identity to the authentication server, or removes an identity. | |
7 | * | |
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 | * | |
14 | * SSH2 implementation, | |
15 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. | |
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. | |
36 | */ | |
37 | ||
38 | #include "includes.h" | |
39 | ||
40 | #include <sys/types.h> | |
41 | #include <sys/stat.h> | |
42 | ||
43 | #include <openssl/evp.h> | |
44 | ||
45 | #include <fcntl.h> | |
46 | #include <pwd.h> | |
47 | #include <string.h> | |
48 | #include <unistd.h> | |
49 | ||
50 | #include "ssh.h" | |
51 | #include "rsa.h" | |
52 | #include "log.h" | |
53 | #include "xmalloc.h" | |
54 | #include "key.h" | |
55 | #include "authfd.h" | |
56 | #include "authfile.h" | |
57 | #include "pathnames.h" | |
58 | #include "misc.h" | |
59 | ||
60 | /* argv0 */ | |
61 | extern char *__progname; | |
62 | ||
63 | /* Default files to add */ | |
64 | static char *default_files[] = { | |
65 | _PATH_SSH_CLIENT_ID_RSA, | |
66 | _PATH_SSH_CLIENT_ID_DSA, | |
67 | _PATH_SSH_CLIENT_IDENTITY, | |
68 | NULL | |
69 | }; | |
70 | ||
71 | /* Default lifetime (0 == forever) */ | |
72 | static int lifetime = 0; | |
73 | ||
74 | /* User has to confirm key use */ | |
75 | static int confirm = 0; | |
76 | ||
77 | /* we keep a cache of one passphrases */ | |
78 | static char *pass = NULL; | |
79 | static void | |
80 | clear_pass(void) | |
81 | { | |
82 | if (pass) { | |
83 | memset(pass, 0, strlen(pass)); | |
84 | xfree(pass); | |
85 | pass = NULL; | |
86 | } | |
87 | } | |
88 | ||
89 | static int | |
90 | delete_file(AuthenticationConnection *ac, const char *filename) | |
91 | { | |
92 | Key *public; | |
93 | char *comment = NULL; | |
94 | int ret = -1; | |
95 | ||
96 | public = key_load_public(filename, &comment); | |
97 | if (public == NULL) { | |
98 | printf("Bad key file %s\n", filename); | |
99 | return -1; | |
100 | } | |
101 | if (ssh_remove_identity(ac, public)) { | |
102 | fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); | |
103 | ret = 0; | |
104 | } else | |
105 | fprintf(stderr, "Could not remove identity: %s\n", filename); | |
106 | ||
107 | key_free(public); | |
108 | xfree(comment); | |
109 | ||
110 | return ret; | |
111 | } | |
112 | ||
113 | /* Send a request to remove all identities. */ | |
114 | static int | |
115 | delete_all(AuthenticationConnection *ac) | |
116 | { | |
117 | int ret = -1; | |
118 | ||
119 | if (ssh_remove_all_identities(ac, 1)) | |
120 | ret = 0; | |
121 | /* ignore error-code for ssh2 */ | |
122 | ssh_remove_all_identities(ac, 2); | |
123 | ||
124 | if (ret == 0) | |
125 | fprintf(stderr, "All identities removed.\n"); | |
126 | else | |
127 | fprintf(stderr, "Failed to remove all identities.\n"); | |
128 | ||
129 | return ret; | |
130 | } | |
131 | ||
132 | static int | |
133 | add_file(AuthenticationConnection *ac, const char *filename) | |
134 | { | |
135 | Key *private; | |
136 | char *comment = NULL; | |
137 | char msg[1024]; | |
138 | int fd, perms_ok, ret = -1; | |
139 | ||
140 | if ((fd = open(filename, O_RDONLY)) < 0) { | |
141 | perror(filename); | |
142 | return -1; | |
143 | } | |
144 | ||
145 | /* | |
146 | * Since we'll try to load a keyfile multiple times, permission errors | |
147 | * will occur multiple times, so check perms first and bail if wrong. | |
148 | */ | |
149 | perms_ok = key_perm_ok(fd, filename); | |
150 | close(fd); | |
151 | if (!perms_ok) | |
152 | return -1; | |
153 | ||
154 | /* At first, try empty passphrase */ | |
155 | private = key_load_private(filename, "", &comment); | |
156 | if (comment == NULL) | |
157 | comment = xstrdup(filename); | |
158 | /* try last */ | |
159 | if (private == NULL && pass != NULL) | |
160 | private = key_load_private(filename, pass, NULL); | |
161 | if (private == NULL) { | |
162 | /* clear passphrase since it did not work */ | |
163 | clear_pass(); | |
164 | snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", | |
165 | comment); | |
166 | for (;;) { | |
167 | pass = read_passphrase(msg, RP_ALLOW_STDIN); | |
168 | if (strcmp(pass, "") == 0) { | |
169 | clear_pass(); | |
170 | xfree(comment); | |
171 | return -1; | |
172 | } | |
173 | private = key_load_private(filename, pass, &comment); | |
174 | if (private != NULL) | |
175 | break; | |
176 | clear_pass(); | |
177 | snprintf(msg, sizeof msg, | |
178 | "Bad passphrase, try again for %.200s: ", comment); | |
179 | } | |
180 | } | |
181 | ||
182 | if (ssh_add_identity_constrained(ac, private, comment, lifetime, | |
183 | confirm)) { | |
184 | fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); | |
185 | ret = 0; | |
186 | if (lifetime != 0) | |
187 | fprintf(stderr, | |
188 | "Lifetime set to %d seconds\n", lifetime); | |
189 | if (confirm != 0) | |
190 | fprintf(stderr, | |
191 | "The user has to confirm each use of the key\n"); | |
192 | } else if (ssh_add_identity(ac, private, comment)) { | |
193 | fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); | |
194 | ret = 0; | |
195 | } else { | |
196 | fprintf(stderr, "Could not add identity: %s\n", filename); | |
197 | } | |
198 | ||
199 | xfree(comment); | |
200 | key_free(private); | |
201 | ||
202 | return ret; | |
203 | } | |
204 | ||
205 | static int | |
206 | update_card(AuthenticationConnection *ac, int add, const char *id) | |
207 | { | |
208 | char *pin; | |
209 | int ret = -1; | |
210 | ||
211 | pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); | |
212 | if (pin == NULL) | |
213 | return -1; | |
214 | ||
215 | if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) { | |
216 | fprintf(stderr, "Card %s: %s\n", | |
217 | add ? "added" : "removed", id); | |
218 | ret = 0; | |
219 | } else { | |
220 | fprintf(stderr, "Could not %s card: %s\n", | |
221 | add ? "add" : "remove", id); | |
222 | ret = -1; | |
223 | } | |
224 | xfree(pin); | |
225 | return ret; | |
226 | } | |
227 | ||
228 | static int | |
229 | list_identities(AuthenticationConnection *ac, int do_fp) | |
230 | { | |
231 | Key *key; | |
232 | char *comment, *fp; | |
233 | int had_identities = 0; | |
234 | int version; | |
235 | ||
236 | for (version = 1; version <= 2; version++) { | |
237 | for (key = ssh_get_first_identity(ac, &comment, version); | |
238 | key != NULL; | |
239 | key = ssh_get_next_identity(ac, &comment, version)) { | |
240 | had_identities = 1; | |
241 | if (do_fp) { | |
242 | fp = key_fingerprint(key, SSH_FP_MD5, | |
243 | SSH_FP_HEX); | |
244 | printf("%d %s %s (%s)\n", | |
245 | key_size(key), fp, comment, key_type(key)); | |
246 | xfree(fp); | |
247 | } else { | |
248 | if (!key_write(key, stdout)) | |
249 | fprintf(stderr, "key_write failed"); | |
250 | fprintf(stdout, " %s\n", comment); | |
251 | } | |
252 | key_free(key); | |
253 | xfree(comment); | |
254 | } | |
255 | } | |
256 | if (!had_identities) { | |
257 | printf("The agent has no identities.\n"); | |
258 | return -1; | |
259 | } | |
260 | return 0; | |
261 | } | |
262 | ||
263 | static int | |
264 | lock_agent(AuthenticationConnection *ac, int lock) | |
265 | { | |
266 | char prompt[100], *p1, *p2; | |
267 | int passok = 1, ret = -1; | |
268 | ||
269 | strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); | |
270 | p1 = read_passphrase(prompt, RP_ALLOW_STDIN); | |
271 | if (lock) { | |
272 | strlcpy(prompt, "Again: ", sizeof prompt); | |
273 | p2 = read_passphrase(prompt, RP_ALLOW_STDIN); | |
274 | if (strcmp(p1, p2) != 0) { | |
275 | fprintf(stderr, "Passwords do not match.\n"); | |
276 | passok = 0; | |
277 | } | |
278 | memset(p2, 0, strlen(p2)); | |
279 | xfree(p2); | |
280 | } | |
281 | if (passok && ssh_lock_agent(ac, lock, p1)) { | |
282 | fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); | |
283 | ret = 0; | |
284 | } else | |
285 | fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); | |
286 | memset(p1, 0, strlen(p1)); | |
287 | xfree(p1); | |
288 | return (ret); | |
289 | } | |
290 | ||
291 | static int | |
292 | do_file(AuthenticationConnection *ac, int deleting, char *file) | |
293 | { | |
294 | if (deleting) { | |
295 | if (delete_file(ac, file) == -1) | |
296 | return -1; | |
297 | } else { | |
298 | if (add_file(ac, file) == -1) | |
299 | return -1; | |
300 | } | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static void | |
305 | usage(void) | |
306 | { | |
307 | fprintf(stderr, "Usage: %s [options] [file ...]\n", __progname); | |
308 | fprintf(stderr, "Options:\n"); | |
309 | fprintf(stderr, " -l List fingerprints of all identities.\n"); | |
310 | fprintf(stderr, " -L List public key parameters of all identities.\n"); | |
311 | fprintf(stderr, " -d Delete identity.\n"); | |
312 | fprintf(stderr, " -D Delete all identities.\n"); | |
313 | fprintf(stderr, " -x Lock agent.\n"); | |
314 | fprintf(stderr, " -X Unlock agent.\n"); | |
315 | fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); | |
316 | fprintf(stderr, " -c Require confirmation to sign using identities\n"); | |
317 | #ifdef SMARTCARD | |
318 | fprintf(stderr, " -s reader Add key in smartcard reader.\n"); | |
319 | fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); | |
320 | #endif | |
321 | } | |
322 | ||
323 | int | |
324 | main(int argc, char **argv) | |
325 | { | |
326 | extern char *optarg; | |
327 | extern int optind; | |
328 | AuthenticationConnection *ac = NULL; | |
329 | char *sc_reader_id = NULL; | |
330 | int i, ch, deleting = 0, ret = 0; | |
331 | ||
332 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ | |
333 | sanitise_stdfd(); | |
334 | ||
335 | __progname = ssh_get_progname(argv[0]); | |
336 | init_rng(); | |
337 | seed_rng(); | |
338 | ||
339 | SSLeay_add_all_algorithms(); | |
340 | ||
341 | /* At first, get a connection to the authentication agent. */ | |
342 | ac = ssh_get_authentication_connection(); | |
343 | if (ac == NULL) { | |
344 | fprintf(stderr, | |
345 | "Could not open a connection to your authentication agent.\n"); | |
346 | exit(2); | |
347 | } | |
348 | while ((ch = getopt(argc, argv, "lLcdDxXe:s:t:")) != -1) { | |
349 | switch (ch) { | |
350 | case 'l': | |
351 | case 'L': | |
352 | if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) | |
353 | ret = 1; | |
354 | goto done; | |
355 | case 'x': | |
356 | case 'X': | |
357 | if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) | |
358 | ret = 1; | |
359 | goto done; | |
360 | case 'c': | |
361 | confirm = 1; | |
362 | break; | |
363 | case 'd': | |
364 | deleting = 1; | |
365 | break; | |
366 | case 'D': | |
367 | if (delete_all(ac) == -1) | |
368 | ret = 1; | |
369 | goto done; | |
370 | case 's': | |
371 | sc_reader_id = optarg; | |
372 | break; | |
373 | case 'e': | |
374 | deleting = 1; | |
375 | sc_reader_id = optarg; | |
376 | break; | |
377 | case 't': | |
378 | if ((lifetime = convtime(optarg)) == -1) { | |
379 | fprintf(stderr, "Invalid lifetime\n"); | |
380 | ret = 1; | |
381 | goto done; | |
382 | } | |
383 | break; | |
384 | default: | |
385 | usage(); | |
386 | ret = 1; | |
387 | goto done; | |
388 | } | |
389 | } | |
390 | argc -= optind; | |
391 | argv += optind; | |
392 | if (sc_reader_id != NULL) { | |
393 | if (update_card(ac, !deleting, sc_reader_id) == -1) | |
394 | ret = 1; | |
395 | goto done; | |
396 | } | |
397 | if (argc == 0) { | |
398 | char buf[MAXPATHLEN]; | |
399 | struct passwd *pw; | |
400 | struct stat st; | |
401 | int count = 0; | |
402 | ||
403 | if ((pw = getpwuid(getuid())) == NULL) { | |
404 | fprintf(stderr, "No user found with uid %u\n", | |
405 | (u_int)getuid()); | |
406 | ret = 1; | |
407 | goto done; | |
408 | } | |
409 | ||
410 | for (i = 0; default_files[i]; i++) { | |
411 | snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, | |
412 | default_files[i]); | |
413 | if (stat(buf, &st) < 0) | |
414 | continue; | |
415 | if (do_file(ac, deleting, buf) == -1) | |
416 | ret = 1; | |
417 | else | |
418 | count++; | |
419 | } | |
420 | if (count == 0) | |
421 | ret = 1; | |
422 | } else { | |
423 | for (i = 0; i < argc; i++) { | |
424 | if (do_file(ac, deleting, argv[i]) == -1) | |
425 | ret = 1; | |
426 | } | |
427 | } | |
428 | clear_pass(); | |
429 | ||
430 | done: | |
431 | ssh_close_authentication_connection(ac); | |
432 | return ret; | |
433 | } |