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[gssapi-openssh.git] / openssh / ssh-add.c
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 }
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