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 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 1.40 2001/06/24 05:35:33 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
  52 #ifdef HAVE___PROGNAME
  53 extern char *__progname;
  54 #else
  55 char *__progname;
  56 #endif
  57
  58 /* we keep a cache of one passphrases */
  59 static char *pass = NULL;
  60 static void
  61 clear_pass(void)
  62 {
  63         if (pass) {
  64                 memset(pass, 0, strlen(pass));
  65                 xfree(pass);
  66                 pass = NULL;
  67         }
  68 }
  69
  70 static void
  71 delete_file(AuthenticationConnection *ac, const char *filename)
  72 {
  73         Key *public;
  74         char *comment = NULL;
  75
  76         public = key_load_public(filename, &comment);
  77         if (public == NULL) {
  78                 printf("Bad key file %s\n", filename);
  79                 return;
  80         }
  81         if (ssh_remove_identity(ac, public))
  82                 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
  83         else
  84                 fprintf(stderr, "Could not remove identity: %s\n", filename);
  85         key_free(public);
  86         xfree(comment);
  87 }
  88
  89 /* Send a request to remove all identities. */
  90 static void
  91 delete_all(AuthenticationConnection *ac)
  92 {
  93         int success = 1;
  94
  95         if (!ssh_remove_all_identities(ac, 1))
  96                 success = 0;
  97         /* ignore error-code for ssh2 */
  98         ssh_remove_all_identities(ac, 2);
  99
 100         if (success)
 101                 fprintf(stderr, "All identities removed.\n");
 102         else
 103                 fprintf(stderr, "Failed to remove all identities.\n");
 104 }
 105
 106 static void
 107 add_file(AuthenticationConnection *ac, const char *filename)
 108 {
 109         struct stat st;
 110         Key *private;
 111         char *comment = NULL;
 112         char msg[1024];
 113
 114         if (stat(filename, &st) < 0) {
 115                 perror(filename);
 116                 exit(1);
 117         }
 118         /* At first, try empty passphrase */
 119         private = key_load_private(filename, "", &comment);
 120         if (comment == NULL)
 121                 comment = xstrdup(filename);
 122         /* try last */
 123         if (private == NULL && pass != NULL)
 124                 private = key_load_private(filename, pass, NULL);
 125         if (private == NULL) {
 126                 /* clear passphrase since it did not work */
 127                 clear_pass();
 128                 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ",
 129                    comment);
 130                 for (;;) {
 131                         pass = read_passphrase(msg, RP_ALLOW_STDIN);
 132                         if (strcmp(pass, "") == 0) {
 133                                 clear_pass();
 134                                 xfree(comment);
 135                                 return;
 136                         }
 137                         private = key_load_private(filename, pass, &comment);
 138                         if (private != NULL)
 139                                 break;
 140                         clear_pass();
 141                         strlcpy(msg, "Bad passphrase, try again: ", sizeof msg);
 142                 }
 143         }
 144         if (ssh_add_identity(ac, private, comment))
 145                 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
 146         else
 147                 fprintf(stderr, "Could not add identity: %s\n", filename);
 148         xfree(comment);
 149         key_free(private);
 150 }
 151
 152 static void
 153 list_identities(AuthenticationConnection *ac, int do_fp)
 154 {
 155         Key *key;
 156         char *comment, *fp;
 157         int had_identities = 0;
 158         int version;
 159
 160         for (version = 1; version <= 2; version++) {
 161                 for (key = ssh_get_first_identity(ac, &comment, version);
 162                      key != NULL;
 163                      key = ssh_get_next_identity(ac, &comment, version)) {
 164                         had_identities = 1;
 165                         if (do_fp) {
 166                                 fp = key_fingerprint(key, SSH_FP_MD5,
 167                                     SSH_FP_HEX);
 168                                 printf("%d %s %s (%s)\n",
 169                                     key_size(key), fp, comment, key_type(key));
 170                                 xfree(fp);
 171                         } else {
 172                                 if (!key_write(key, stdout))
 173                                         fprintf(stderr, "key_write failed");
 174                                 fprintf(stdout, " %s\n", comment);
 175                         }
 176                         key_free(key);
 177                         xfree(comment);
 178                 }
 179         }
 180         if (!had_identities)
 181                 printf("The agent has no identities.\n");
 182 }
 183
 184 int
 185 main(int argc, char **argv)
 186 {
 187         AuthenticationConnection *ac = NULL;
 188         struct passwd *pw;
 189         char buf[1024];
 190         int no_files = 1;
 191         int i;
 192         int deleting = 0;
 193
 194         __progname = get_progname(argv[0]);
 195         init_rng();
 196         seed_rng();
 197
 198         SSLeay_add_all_algorithms();
 199
 200         /* At first, get a connection to the authentication agent. */
 201         ac = ssh_get_authentication_connection();
 202         if (ac == NULL) {
 203                 fprintf(stderr, "Could not open a connection to your authentication agent.\n");
 204                 exit(1);
 205         }
 206         for (i = 1; i < argc; i++) {
 207                 if ((strcmp(argv[i], "-l") == 0) ||
 208                     (strcmp(argv[i], "-L") == 0)) {
 209                         list_identities(ac, argv[i][1] == 'l' ? 1 : 0);
 210                         /* Don't default-add/delete if -l. */
 211                         no_files = 0;
 212                         continue;
 213                 }
 214                 if (strcmp(argv[i], "-d") == 0) {
 215                         deleting = 1;
 216                         continue;
 217                 }
 218                 if (strcmp(argv[i], "-D") == 0) {
 219                         delete_all(ac);
 220                         no_files = 0;
 221                         continue;
 222                 }
 223                 no_files = 0;
 224                 if (deleting)
 225                         delete_file(ac, argv[i]);
 226                 else
 227                         add_file(ac, argv[i]);
 228         }
 229         if (no_files) {
 230                 pw = getpwuid(getuid());
 231                 if (!pw) {
 232                         fprintf(stderr, "No user found with uid %u\n",
 233                             (u_int)getuid());
 234                         ssh_close_authentication_connection(ac);
 235                         exit(1);
 236                 }
 237                 snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, _PATH_SSH_CLIENT_IDENTITY);
 238                 if (deleting)
 239                         delete_file(ac, buf);
 240                 else
 241                         add_file(ac, buf);
 242         }
 243         clear_pass();
 244         ssh_close_authentication_connection(ac);
 245         exit(0);
 246 }