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" |
---|
38 | RCSID("$OpenBSD: ssh-add.c,v 1.63 2002/09/19 15:51:23 markus Exp $"); |
---|
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" |
---|
51 | #include "misc.h" |
---|
52 | |
---|
53 | #ifdef HAVE___PROGNAME |
---|
54 | extern char *__progname; |
---|
55 | #else |
---|
56 | char *__progname; |
---|
57 | #endif |
---|
58 | |
---|
59 | /* argv0 */ |
---|
60 | extern char *__progname; |
---|
61 | |
---|
62 | /* Default files to add */ |
---|
63 | static char *default_files[] = { |
---|
64 | _PATH_SSH_CLIENT_ID_RSA, |
---|
65 | _PATH_SSH_CLIENT_ID_DSA, |
---|
66 | _PATH_SSH_CLIENT_IDENTITY, |
---|
67 | NULL |
---|
68 | }; |
---|
69 | |
---|
70 | /* Default lifetime (0 == forever) */ |
---|
71 | static int lifetime = 0; |
---|
72 | |
---|
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); |
---|
105 | |
---|
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 | } |
---|
167 | |
---|
168 | if (ssh_add_identity_constrained(ac, private, comment, lifetime)) { |
---|
169 | fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); |
---|
170 | ret = 0; |
---|
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 { |
---|
178 | fprintf(stderr, "Could not add identity: %s\n", filename); |
---|
179 | } |
---|
180 | |
---|
181 | xfree(comment); |
---|
182 | key_free(private); |
---|
183 | |
---|
184 | return ret; |
---|
185 | } |
---|
186 | |
---|
187 | static int |
---|
188 | update_card(AuthenticationConnection *ac, int add, const char *id) |
---|
189 | { |
---|
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)) { |
---|
197 | fprintf(stderr, "Card %s: %s\n", |
---|
198 | add ? "added" : "removed", id); |
---|
199 | return 0; |
---|
200 | } else { |
---|
201 | fprintf(stderr, "Could not %s card: %s\n", |
---|
202 | add ? "add" : "remove", id); |
---|
203 | return -1; |
---|
204 | } |
---|
205 | } |
---|
206 | |
---|
207 | static int |
---|
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); |
---|
217 | key != NULL; |
---|
218 | key = ssh_get_next_identity(ac, &comment, version)) { |
---|
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 | } |
---|
235 | if (!had_identities) { |
---|
236 | printf("The agent has no identities.\n"); |
---|
237 | return -1; |
---|
238 | } |
---|
239 | return 0; |
---|
240 | } |
---|
241 | |
---|
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 (ret); |
---|
268 | } |
---|
269 | |
---|
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; |
---|
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"); |
---|
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"); |
---|
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; |
---|
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"); |
---|
320 | exit(2); |
---|
321 | } |
---|
322 | while ((ch = getopt(argc, argv, "lLdDxXe:s:t:")) != -1) { |
---|
323 | switch (ch) { |
---|
324 | case 'l': |
---|
325 | case 'L': |
---|
326 | if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) |
---|
327 | ret = 1; |
---|
328 | goto done; |
---|
329 | break; |
---|
330 | case 'x': |
---|
331 | case 'X': |
---|
332 | if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) |
---|
333 | ret = 1; |
---|
334 | goto done; |
---|
335 | break; |
---|
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': |
---|
348 | deleting = 1; |
---|
349 | sc_reader_id = optarg; |
---|
350 | break; |
---|
351 | case 't': |
---|
352 | if ((lifetime = convtime(optarg)) == -1) { |
---|
353 | fprintf(stderr, "Invalid lifetime\n"); |
---|
354 | ret = 1; |
---|
355 | goto done; |
---|
356 | } |
---|
357 | break; |
---|
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) { |
---|
372 | char buf[MAXPATHLEN]; |
---|
373 | struct passwd *pw; |
---|
374 | struct stat st; |
---|
375 | int count = 0; |
---|
376 | |
---|
377 | if ((pw = getpwuid(getuid())) == NULL) { |
---|
378 | fprintf(stderr, "No user found with uid %u\n", |
---|
379 | (u_int)getuid()); |
---|
380 | ret = 1; |
---|
381 | goto done; |
---|
382 | } |
---|
383 | |
---|
384 | for(i = 0; default_files[i]; i++) { |
---|
385 | snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, |
---|
386 | default_files[i]); |
---|
387 | if (stat(buf, &st) < 0) |
---|
388 | continue; |
---|
389 | if (do_file(ac, deleting, buf) == -1) |
---|
390 | ret = 1; |
---|
391 | else |
---|
392 | count++; |
---|
393 | } |
---|
394 | if (count == 0) |
---|
395 | ret = 1; |
---|
396 | } else { |
---|
397 | for(i = 0; i < argc; i++) { |
---|
398 | if (do_file(ac, deleting, argv[i]) == -1) |
---|
399 | ret = 1; |
---|
400 | } |
---|
401 | } |
---|
402 | clear_pass(); |
---|
403 | |
---|
404 | done: |
---|
405 | ssh_close_authentication_connection(ac); |
---|
406 | return ret; |
---|
407 | } |
---|