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updating OPENSSH_GSSAPI_Protocol1-branch with latest on the trunk (OpenSSH 3.2.3p1)
[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 1.53 2002/03/21 22:44:05 rees 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 /* Default files to add */
62 static char *default_files[] = {
63         _PATH_SSH_CLIENT_ID_RSA,
64         _PATH_SSH_CLIENT_ID_DSA,
65         _PATH_SSH_CLIENT_IDENTITY,
66         NULL
67 };
68
69
70 /* we keep a cache of one passphrases */
71 static char *pass = NULL;
72 static void
73 clear_pass(void)
74 {
75         if (pass) {
76                 memset(pass, 0, strlen(pass));
77                 xfree(pass);
78                 pass = NULL;
79         }
80 }
81
82 static int
83 delete_file(AuthenticationConnection *ac, const char *filename)
84 {
85         Key *public;
86         char *comment = NULL;
87         int ret = -1;
88
89         public = key_load_public(filename, &comment);
90         if (public == NULL) {
91                 printf("Bad key file %s\n", filename);
92                 return -1;
93         }
94         if (ssh_remove_identity(ac, public)) {
95                 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
96                 ret = 0;
97         } else
98                 fprintf(stderr, "Could not remove identity: %s\n", filename);
99
100         key_free(public);
101         xfree(comment);
102
103         return ret;
104 }
105
106 /* Send a request to remove all identities. */
107 static int
108 delete_all(AuthenticationConnection *ac)
109 {
110         int ret = -1;
111
112         if (ssh_remove_all_identities(ac, 1))
113                 ret = 0;
114         /* ignore error-code for ssh2 */
115         ssh_remove_all_identities(ac, 2);
116
117         if (ret == 0)
118                 fprintf(stderr, "All identities removed.\n");
119         else
120                 fprintf(stderr, "Failed to remove all identities.\n");
121
122         return ret;
123 }
124
125 static int
126 add_file(AuthenticationConnection *ac, const char *filename)
127 {
128         struct stat st;
129         Key *private;
130         char *comment = NULL;
131         char msg[1024];
132         int ret = -1;
133
134         if (stat(filename, &st) < 0) {
135                 perror(filename);
136                 return -1;
137         }
138         /* At first, try empty passphrase */
139         private = key_load_private(filename, "", &comment);
140         if (comment == NULL)
141                 comment = xstrdup(filename);
142         /* try last */
143         if (private == NULL && pass != NULL)
144                 private = key_load_private(filename, pass, NULL);
145         if (private == NULL) {
146                 /* clear passphrase since it did not work */
147                 clear_pass();
148                 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ",
149                    comment);
150                 for (;;) {
151                         pass = read_passphrase(msg, RP_ALLOW_STDIN);
152                         if (strcmp(pass, "") == 0) {
153                                 clear_pass();
154                                 xfree(comment);
155                                 return -1;
156                         }
157                         private = key_load_private(filename, pass, &comment);
158                         if (private != NULL)
159                                 break;
160                         clear_pass();
161                         strlcpy(msg, "Bad passphrase, try again: ", sizeof msg);
162                 }
163         }
164         if (ssh_add_identity(ac, private, comment)) {
165                 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
166                 ret = 0;
167         } else
168                 fprintf(stderr, "Could not add identity: %s\n", filename);
169
170         xfree(comment);
171         key_free(private);
172
173         return ret;
174 }
175
176 static int
177 update_card(AuthenticationConnection *ac, int add, const char *id)
178 {
179         char *pin;
180
181         pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
182         if (pin == NULL)
183                 return -1;
184
185         if (ssh_update_card(ac, add, id, pin)) {
186                 fprintf(stderr, "Card %s: %s\n",
187                     add ? "added" : "removed", id);
188                 return 0;
189         } else {
190                 fprintf(stderr, "Could not %s card: %s\n",
191                     add ? "add" : "remove", id);
192                 return -1;
193         }
194 }
195
196 static int
197 list_identities(AuthenticationConnection *ac, int do_fp)
198 {
199         Key *key;
200         char *comment, *fp;
201         int had_identities = 0;
202         int version;
203
204         for (version = 1; version <= 2; version++) {
205                 for (key = ssh_get_first_identity(ac, &comment, version);
206                     key != NULL;
207                     key = ssh_get_next_identity(ac, &comment, version)) {
208                         had_identities = 1;
209                         if (do_fp) {
210                                 fp = key_fingerprint(key, SSH_FP_MD5,
211                                     SSH_FP_HEX);
212                                 printf("%d %s %s (%s)\n",
213                                     key_size(key), fp, comment, key_type(key));
214                                 xfree(fp);
215                         } else {
216                                 if (!key_write(key, stdout))
217                                         fprintf(stderr, "key_write failed");
218                                 fprintf(stdout, " %s\n", comment);
219                         }
220                         key_free(key);
221                         xfree(comment);
222                 }
223         }
224         if (!had_identities) {
225                 printf("The agent has no identities.\n");
226                 return -1;
227         }
228         return 0;
229 }
230
231 static int
232 do_file(AuthenticationConnection *ac, int deleting, char *file)
233 {
234         if (deleting) {
235                 if (delete_file(ac, file) == -1)
236                         return -1;
237         } else {
238                 if (add_file(ac, file) == -1)
239                         return -1;
240         }
241         return 0;
242 }
243
244 static void
245 usage(void)
246 {
247         fprintf(stderr, "Usage: %s [options]\n", __progname);
248         fprintf(stderr, "Options:\n");
249         fprintf(stderr, "  -l          List fingerprints of all identities.\n");
250         fprintf(stderr, "  -L          List public key parameters of all identities.\n");
251         fprintf(stderr, "  -d          Delete identity.\n");
252         fprintf(stderr, "  -D          Delete all identities.\n");
253 #ifdef SMARTCARD
254         fprintf(stderr, "  -s reader   Add key in smartcard reader.\n");
255         fprintf(stderr, "  -e reader   Remove key in smartcard reader.\n");
256 #endif
257 }
258
259 int
260 main(int argc, char **argv)
261 {
262         extern char *optarg;
263         extern int optind;
264         AuthenticationConnection *ac = NULL;
265         char *sc_reader_id = NULL;
266         int i, ch, deleting = 0, ret = 0;
267
268         __progname = get_progname(argv[0]);
269         init_rng();
270         seed_rng();
271
272         SSLeay_add_all_algorithms();
273
274         /* At first, get a connection to the authentication agent. */
275         ac = ssh_get_authentication_connection();
276         if (ac == NULL) {
277                 fprintf(stderr, "Could not open a connection to your authentication agent.\n");
278                 exit(2);
279         }
280         while ((ch = getopt(argc, argv, "lLdDe:s:")) != -1) {
281                 switch (ch) {
282                 case 'l':
283                 case 'L':
284                         if (list_identities(ac, ch == 'l' ? 1 : 0) == -1)
285                                 ret = 1;
286                         goto done;
287                         break;
288                 case 'd':
289                         deleting = 1;
290                         break;
291                 case 'D':
292                         if (delete_all(ac) == -1)
293                                 ret = 1;
294                         goto done;
295                         break;
296                 case 's':
297                         sc_reader_id = optarg;
298                         break;
299                 case 'e':
300                         deleting = 1;
301                         sc_reader_id = optarg;
302                         break;
303                 default:
304                         usage();
305                         ret = 1;
306                         goto done;
307                 }
308         }
309         argc -= optind;
310         argv += optind;
311         if (sc_reader_id != NULL) {
312                 if (update_card(ac, !deleting, sc_reader_id) == -1)
313                         ret = 1;
314                 goto done;
315         }
316         if (argc == 0) {
317                 char buf[MAXPATHLEN];
318                 struct passwd *pw;
319                 struct stat st;
320                 int count = 0;
321
322                 if ((pw = getpwuid(getuid())) == NULL) {
323                         fprintf(stderr, "No user found with uid %u\n",
324                             (u_int)getuid());
325                         ret = 1;
326                         goto done;
327                 }
328
329                 for(i = 0; default_files[i]; i++) {
330                         snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir,
331                             default_files[i]);
332                         if (stat(buf, &st) < 0)
333                                 continue;
334                         if (do_file(ac, deleting, buf) == -1)
335                                 ret = 1;
336                         else
337                                 count++;
338                 }
339                 if (count == 0)
340                         ret = 1;
341         } else {
342                 for(i = 0; i < argc; i++) {
343                         if (do_file(ac, deleting, argv[i]) == -1)
344                                 ret = 1;
345                 }
346         }
347         clear_pass();
348
349 done:
350         ssh_close_authentication_connection(ac);
351         return ret;
352 }
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