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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 1.46 2001/10/02 08:38:50 djm 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 | ||
52 | #ifdef HAVE___PROGNAME | |
53 | extern char *__progname; | |
54 | #else | |
55 | char *__progname; | |
56 | #endif | |
57 | ||
58 | /* argv0 */ | |
59 | extern char *__progname; | |
60 | ||
61 | /* we keep a cache of one passphrases */ | |
62 | static char *pass = NULL; | |
63 | static void | |
64 | clear_pass(void) | |
65 | { | |
66 | if (pass) { | |
67 | memset(pass, 0, strlen(pass)); | |
68 | xfree(pass); | |
69 | pass = NULL; | |
70 | } | |
71 | } | |
72 | ||
73 | static int | |
74 | delete_file(AuthenticationConnection *ac, const char *filename) | |
75 | { | |
76 | Key *public; | |
77 | char *comment = NULL; | |
78 | int ret = -1; | |
79 | ||
80 | public = key_load_public(filename, &comment); | |
81 | if (public == NULL) { | |
82 | printf("Bad key file %s\n", filename); | |
83 | return -1; | |
84 | } | |
85 | if (ssh_remove_identity(ac, public)) { | |
86 | fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); | |
87 | ret = 0; | |
88 | } else | |
89 | fprintf(stderr, "Could not remove identity: %s\n", filename); | |
90 | ||
91 | key_free(public); | |
92 | xfree(comment); | |
93 | ||
94 | return ret; | |
95 | } | |
96 | ||
97 | /* Send a request to remove all identities. */ | |
98 | static int | |
99 | delete_all(AuthenticationConnection *ac) | |
100 | { | |
101 | int ret = -1; | |
102 | ||
103 | if (ssh_remove_all_identities(ac, 1)) | |
104 | ret = 0; | |
105 | /* ignore error-code for ssh2 */ | |
106 | ssh_remove_all_identities(ac, 2); | |
107 | ||
108 | if (ret == 0) | |
109 | fprintf(stderr, "All identities removed.\n"); | |
110 | else | |
111 | fprintf(stderr, "Failed to remove all identities.\n"); | |
112 | ||
113 | return ret; | |
114 | } | |
115 | ||
116 | static int | |
117 | add_file(AuthenticationConnection *ac, const char *filename) | |
118 | { | |
119 | struct stat st; | |
120 | Key *private; | |
121 | char *comment = NULL; | |
122 | char msg[1024]; | |
123 | int ret = -1; | |
124 | ||
125 | if (stat(filename, &st) < 0) { | |
126 | perror(filename); | |
127 | return -1; | |
128 | } | |
129 | /* At first, try empty passphrase */ | |
130 | private = key_load_private(filename, "", &comment); | |
131 | if (comment == NULL) | |
132 | comment = xstrdup(filename); | |
133 | /* try last */ | |
134 | if (private == NULL && pass != NULL) | |
135 | private = key_load_private(filename, pass, NULL); | |
136 | if (private == NULL) { | |
137 | /* clear passphrase since it did not work */ | |
138 | clear_pass(); | |
139 | snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", | |
140 | comment); | |
141 | for (;;) { | |
142 | pass = read_passphrase(msg, RP_ALLOW_STDIN); | |
143 | if (strcmp(pass, "") == 0) { | |
144 | clear_pass(); | |
145 | xfree(comment); | |
146 | return -1; | |
147 | } | |
148 | private = key_load_private(filename, pass, &comment); | |
149 | if (private != NULL) | |
150 | break; | |
151 | clear_pass(); | |
152 | strlcpy(msg, "Bad passphrase, try again: ", sizeof msg); | |
153 | } | |
154 | } | |
155 | if (ssh_add_identity(ac, private, comment)) { | |
156 | fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); | |
157 | ret = 0; | |
158 | } else | |
159 | fprintf(stderr, "Could not add identity: %s\n", filename); | |
160 | ||
161 | xfree(comment); | |
162 | key_free(private); | |
163 | ||
164 | return ret; | |
165 | } | |
166 | ||
167 | static int | |
168 | update_card(AuthenticationConnection *ac, int add, const char *id) | |
169 | { | |
170 | if (ssh_update_card(ac, add, id)) { | |
171 | fprintf(stderr, "Card %s: %s\n", | |
172 | add ? "added" : "removed", id); | |
173 | return 0; | |
174 | } else { | |
175 | fprintf(stderr, "Could not %s card: %s\n", | |
176 | add ? "add" : "remove", id); | |
177 | return -1; | |
178 | } | |
179 | } | |
180 | ||
181 | static void | |
182 | list_identities(AuthenticationConnection *ac, int do_fp) | |
183 | { | |
184 | Key *key; | |
185 | char *comment, *fp; | |
186 | int had_identities = 0; | |
187 | int version; | |
188 | ||
189 | for (version = 1; version <= 2; version++) { | |
190 | for (key = ssh_get_first_identity(ac, &comment, version); | |
191 | key != NULL; | |
192 | key = ssh_get_next_identity(ac, &comment, version)) { | |
193 | had_identities = 1; | |
194 | if (do_fp) { | |
195 | fp = key_fingerprint(key, SSH_FP_MD5, | |
196 | SSH_FP_HEX); | |
197 | printf("%d %s %s (%s)\n", | |
198 | key_size(key), fp, comment, key_type(key)); | |
199 | xfree(fp); | |
200 | } else { | |
201 | if (!key_write(key, stdout)) | |
202 | fprintf(stderr, "key_write failed"); | |
203 | fprintf(stdout, " %s\n", comment); | |
204 | } | |
205 | key_free(key); | |
206 | xfree(comment); | |
207 | } | |
208 | } | |
209 | if (!had_identities) | |
210 | printf("The agent has no identities.\n"); | |
211 | } | |
212 | ||
213 | static void | |
214 | usage(void) | |
215 | { | |
216 | fprintf(stderr, "Usage: %s [options]\n", __progname); | |
217 | fprintf(stderr, "Options:\n"); | |
218 | fprintf(stderr, " -l List fingerprints of all identities.\n"); | |
219 | fprintf(stderr, " -L List public key parameters of all identities.\n"); | |
220 | fprintf(stderr, " -d Delete identity.\n"); | |
221 | fprintf(stderr, " -D Delete all identities.\n"); | |
222 | #ifdef SMARTCARD | |
223 | fprintf(stderr, " -s reader Add key in smartcard reader.\n"); | |
224 | fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); | |
225 | #endif | |
226 | } | |
227 | ||
228 | int | |
229 | main(int argc, char **argv) | |
230 | { | |
231 | extern char *optarg; | |
232 | extern int optind; | |
233 | AuthenticationConnection *ac = NULL; | |
234 | struct passwd *pw; | |
235 | char buf[1024]; | |
236 | char *sc_reader_id = NULL; | |
237 | int i, ch, deleting = 0, ret = 0; | |
238 | ||
239 | __progname = get_progname(argv[0]); | |
240 | init_rng(); | |
241 | seed_rng(); | |
242 | ||
243 | SSLeay_add_all_algorithms(); | |
244 | ||
245 | /* At first, get a connection to the authentication agent. */ | |
246 | ac = ssh_get_authentication_connection(); | |
247 | if (ac == NULL) { | |
248 | fprintf(stderr, "Could not open a connection to your authentication agent.\n"); | |
249 | exit(1); | |
250 | } | |
251 | while ((ch = getopt(argc, argv, "lLdDe:s:")) != -1) { | |
252 | switch (ch) { | |
253 | case 'l': | |
254 | case 'L': | |
255 | list_identities(ac, ch == 'l' ? 1 : 0); | |
256 | goto done; | |
257 | break; | |
258 | case 'd': | |
259 | deleting = 1; | |
260 | break; | |
261 | case 'D': | |
262 | if (delete_all(ac) == -1) | |
263 | ret = 1; | |
264 | goto done; | |
265 | break; | |
266 | case 's': | |
267 | sc_reader_id = optarg; | |
268 | break; | |
269 | case 'e': | |
270 | deleting = 1; | |
271 | sc_reader_id = optarg; | |
272 | break; | |
273 | default: | |
274 | usage(); | |
275 | ret = 1; | |
276 | goto done; | |
277 | } | |
278 | } | |
279 | argc -= optind; | |
280 | argv += optind; | |
281 | if (sc_reader_id != NULL) { | |
282 | if (update_card(ac, !deleting, sc_reader_id) == -1) | |
283 | ret = 1; | |
284 | goto done; | |
285 | } | |
286 | if (argc == 0) { | |
287 | pw = getpwuid(getuid()); | |
288 | if (!pw) { | |
289 | fprintf(stderr, "No user found with uid %u\n", | |
290 | (u_int)getuid()); | |
291 | ret = 1; | |
292 | goto done; | |
293 | } | |
294 | snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, _PATH_SSH_CLIENT_IDENTITY); | |
295 | if (deleting) { | |
296 | if (delete_file(ac, buf) == -1) | |
297 | ret = 1; | |
298 | } else { | |
299 | if (add_file(ac, buf) == -1) | |
300 | ret = 1; | |
301 | } | |
302 | } else { | |
303 | for (i = 0; i < argc; i++) { | |
304 | if (deleting) { | |
305 | if (delete_file(ac, argv[i]) == -1) | |
306 | ret = 1; | |
307 | } else { | |
308 | if (add_file(ac, argv[i]) == -1) | |
309 | ret = 1; | |
310 | } | |
311 | } | |
312 | } | |
313 | clear_pass(); | |
314 | ||
315 | done: | |
316 | ssh_close_authentication_connection(ac); | |
317 | return ret; | |
318 | } |