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 1.42 2001/06/26 04:59:59 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 update_card(AuthenticationConnection *ac, int add, int id)
 154 {
 155         if (ssh_update_card(ac, add, id))
 156                 fprintf(stderr, "Card %s: %d\n",
 157                      add ? "added" : "removed", id);
 158         else
 159                 fprintf(stderr, "Could not %s card: %d\n",
 160                      add ? "add" : "remove", id);
 161 }
 162
 163 static void
 164 list_identities(AuthenticationConnection *ac, int do_fp)
 165 {
 166         Key *key;
 167         char *comment, *fp;
 168         int had_identities = 0;
 169         int version;
 170
 171         for (version = 1; version <= 2; version++) {
 172                 for (key = ssh_get_first_identity(ac, &comment, version);
 173                      key != NULL;
 174                      key = ssh_get_next_identity(ac, &comment, version)) {
 175                         had_identities = 1;
 176                         if (do_fp) {
 177                                 fp = key_fingerprint(key, SSH_FP_MD5,
 178                                     SSH_FP_HEX);
 179                                 printf("%d %s %s (%s)\n",
 180                                     key_size(key), fp, comment, key_type(key));
 181                                 xfree(fp);
 182                         } else {
 183                                 if (!key_write(key, stdout))
 184                                         fprintf(stderr, "key_write failed");
 185                                 fprintf(stdout, " %s\n", comment);
 186                         }
 187                         key_free(key);
 188                         xfree(comment);
 189                 }
 190         }
 191         if (!had_identities)
 192                 printf("The agent has no identities.\n");
 193 }
 194
 195 static void
 196 usage(void)
 197 {
 198         printf("Usage: ssh-add [options]\n");
 199         printf("    -l, -L        : list identities\n");
 200         printf("    -d            : delete identity\n");
 201         printf("    -D            : delete all identities\n");
 202         printf("    -s reader_num : add key in the smartcard in reader_num.\n");
 203         printf("    -e reader_num : remove key in the smartcard in reader_num.\n");
 204         exit (1);
 205 }
 206
 207 int
 208 main(int argc, char **argv)
 209 {
 210         AuthenticationConnection *ac = NULL;
 211         struct passwd *pw;
 212         char buf[1024];
 213         int no_files = 1;
 214         int i;
 215         int deleting = 0;
 216         int sc_mode = 0;
 217         int sc_reader_num = 0;
 218
 219         __progname = get_progname(argv[0]);
 220         init_rng();
 221         seed_rng();
 222
 223         SSLeay_add_all_algorithms();
 224
 225         /* At first, get a connection to the authentication agent. */
 226         ac = ssh_get_authentication_connection();
 227         if (ac == NULL) {
 228                 fprintf(stderr, "Could not open a connection to your authentication agent.\n");
 229                 exit(1);
 230         }
 231         for (i = 1; i < argc; i++) {
 232                 if ((strcmp(argv[i], "-l") == 0) ||
 233                     (strcmp(argv[i], "-L") == 0)) {
 234                         list_identities(ac, argv[i][1] == 'l' ? 1 : 0);
 235                         /* Don't default-add/delete if -l. */
 236                         no_files = 0;
 237                         continue;
 238                 }
 239                 if (strcmp(argv[i], "-d") == 0) {
 240                         deleting = 1;
 241                         continue;
 242                 }
 243                 if (strcmp(argv[i], "-D") == 0) {
 244                         delete_all(ac);
 245                         no_files = 0;
 246                         continue;
 247                 }
 248                 if (strcmp(argv[i], "-s") == 0) {
 249                         sc_mode = 1;
 250                         deleting = 0;
 251                         i++;
 252                         if (i >= argc)
 253                                 usage();
 254                         sc_reader_num = atoi(argv[i]);
 255                         continue;
 256                 }
 257                 if (strcmp(argv[i], "-e") == 0) {
 258                         sc_mode = 1;
 259                         deleting = 1;
 260                         i++;
 261                         if (i >= argc)
 262                                 usage();
 263                         sc_reader_num = atoi(argv[i]);
 264                         continue;
 265                 }
 266                 if (sc_mode == 1)
 267                         update_card(ac, !deleting, sc_reader_num);
 268                 no_files = 0;
 269                 if (deleting)
 270                         delete_file(ac, argv[i]);
 271                 else
 272                         add_file(ac, argv[i]);
 273         }
 274         if (sc_mode == 1) {
 275                 update_card(ac, !deleting, sc_reader_num);
 276                 ssh_close_authentication_connection(ac);
 277                 exit(0);
 278         }
 279         if (no_files) {
 280                 pw = getpwuid(getuid());
 281                 if (!pw) {
 282                         fprintf(stderr, "No user found with uid %u\n",
 283                             (u_int)getuid());
 284                         ssh_close_authentication_connection(ac);
 285                         exit(1);
 286                 }
 287                 snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, _PATH_SSH_CLIENT_IDENTITY);
 288                 if (deleting)
 289                         delete_file(ac, buf);
 290                 else
 291                         add_file(ac, buf);
 292         }
 293         clear_pass();
 294         ssh_close_authentication_connection(ac);
 295         exit(0);
 296 }