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 1.50 2002/01/29 14:27:57 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 /* argv0 */ 53 extern char *__progname; 54 55 /* Default files to add */ 56 static char *default_files[] = { 57 _PATH_SSH_CLIENT_ID_RSA, 58 _PATH_SSH_CLIENT_ID_DSA, 59 _PATH_SSH_CLIENT_IDENTITY, 60 NULL 61 }; 62 63 64 /* we keep a cache of one passphrases */ 65 static char *pass = NULL; 66 static void 67 clear_pass(void) 68 { 69 if (pass) { 70 memset(pass, 0, strlen(pass)); 71 xfree(pass); 72 pass = NULL; 73 } 74 } 75 76 static int 77 delete_file(AuthenticationConnection *ac, const char *filename) 78 { 79 Key *public; 80 char *comment = NULL; 81 int ret = -1; 82 83 public = key_load_public(filename, &comment); 84 if (public == NULL) { 85 printf("Bad key file %s\n", filename); 86 return -1; 87 } 88 if (ssh_remove_identity(ac, public)) { 89 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); 90 ret = 0; 91 } else 92 fprintf(stderr, "Could not remove identity: %s\n", filename); 93 94 key_free(public); 95 xfree(comment); 96 97 return ret; 98 } 99 100 /* Send a request to remove all identities. */ 101 static int 102 delete_all(AuthenticationConnection *ac) 103 { 104 int ret = -1; 105 106 if (ssh_remove_all_identities(ac, 1)) 107 ret = 0; 108 /* ignore error-code for ssh2 */ 109 ssh_remove_all_identities(ac, 2); 110 111 if (ret == 0) 112 fprintf(stderr, "All identities removed.\n"); 113 else 114 fprintf(stderr, "Failed to remove all identities.\n"); 115 116 return ret; 117 } 118 119 static int 120 add_file(AuthenticationConnection *ac, const char *filename) 121 { 122 struct stat st; 123 Key *private; 124 char *comment = NULL; 125 char msg[1024]; 126 int ret = -1; 127 128 if (stat(filename, &st) < 0) { 129 perror(filename); 130 return -1; 131 } 132 /* At first, try empty passphrase */ 133 private = key_load_private(filename, "", &comment); 134 if (comment == NULL) 135 comment = xstrdup(filename); 136 /* try last */ 137 if (private == NULL && pass != NULL) 138 private = key_load_private(filename, pass, NULL); 139 if (private == NULL) { 140 /* clear passphrase since it did not work */ 141 clear_pass(); 142 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", 143 comment); 144 for (;;) { 145 pass = read_passphrase(msg, RP_ALLOW_STDIN); 146 if (strcmp(pass, "") == 0) { 147 clear_pass(); 148 xfree(comment); 149 return -1; 150 } 151 private = key_load_private(filename, pass, &comment); 152 if (private != NULL) 153 break; 154 clear_pass(); 155 strlcpy(msg, "Bad passphrase, try again: ", sizeof msg); 156 } 157 } 158 if (ssh_add_identity(ac, private, comment)) { 159 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 160 ret = 0; 161 } else 162 fprintf(stderr, "Could not add identity: %s\n", filename); 163 164 xfree(comment); 165 key_free(private); 166 167 return ret; 168 } 169 170 static int 171 update_card(AuthenticationConnection *ac, int add, const char *id) 172 { 173 if (ssh_update_card(ac, add, id)) { 174 fprintf(stderr, "Card %s: %s\n", 175 add ? "added" : "removed", id); 176 return 0; 177 } else { 178 fprintf(stderr, "Could not %s card: %s\n", 179 add ? "add" : "remove", id); 180 return -1; 181 } 182 } 183 184 static int 185 list_identities(AuthenticationConnection *ac, int do_fp) 186 { 187 Key *key; 188 char *comment, *fp; 189 int had_identities = 0; 190 int version; 191 192 for (version = 1; version <= 2; version++) { 193 for (key = ssh_get_first_identity(ac, &comment, version); 194 key != NULL; 195 key = ssh_get_next_identity(ac, &comment, version)) { 196 had_identities = 1; 197 if (do_fp) { 198 fp = key_fingerprint(key, SSH_FP_MD5, 199 SSH_FP_HEX); 200 printf("%d %s %s (%s)\n", 201 key_size(key), fp, comment, key_type(key)); 202 xfree(fp); 203 } else { 204 if (!key_write(key, stdout)) 205 fprintf(stderr, "key_write failed"); 206 fprintf(stdout, " %s\n", comment); 207 } 208 key_free(key); 209 xfree(comment); 210 } 211 } 212 if (!had_identities) { 213 printf("The agent has no identities.\n"); 214 return -1; 215 } 216 return 0; 217 } 218 219 static int 220 do_file(AuthenticationConnection *ac, int deleting, char *file) 221 { 222 if (deleting) { 223 if (delete_file(ac, file) == -1) 224 return -1; 225 } else { 226 if (add_file(ac, file) == -1) 227 return -1; 228 } 229 return 0; 230 } 231 232 static void 233 usage(void) 234 { 235 fprintf(stderr, "Usage: %s [options]\n", __progname); 236 fprintf(stderr, "Options:\n"); 237 fprintf(stderr, " -l List fingerprints of all identities.\n"); 238 fprintf(stderr, " -L List public key parameters of all identities.\n"); 239 fprintf(stderr, " -d Delete identity.\n"); 240 fprintf(stderr, " -D Delete all identities.\n"); 241 #ifdef SMARTCARD 242 fprintf(stderr, " -s reader Add key in smartcard reader.\n"); 243 fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); 244 #endif 245 } 246 247 int 248 main(int argc, char **argv) 249 { 250 extern char *optarg; 251 extern int optind; 252 AuthenticationConnection *ac = NULL; 253 char *sc_reader_id = NULL; 254 int i, ch, deleting = 0, ret = 0; 255 256 SSLeay_add_all_algorithms(); 257 258 /* At first, get a connection to the authentication agent. */ 259 ac = ssh_get_authentication_connection(); 260 if (ac == NULL) { 261 fprintf(stderr, "Could not open a connection to your authentication agent.\n"); 262 exit(2); 263 } 264 while ((ch = getopt(argc, argv, "lLdDe:s:")) != -1) { 265 switch (ch) { 266 case 'l': 267 case 'L': 268 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) 269 ret = 1; 270 goto done; 271 break; 272 case 'd': 273 deleting = 1; 274 break; 275 case 'D': 276 if (delete_all(ac) == -1) 277 ret = 1; 278 goto done; 279 break; 280 case 's': 281 sc_reader_id = optarg; 282 break; 283 case 'e': 284 deleting = 1; 285 sc_reader_id = optarg; 286 break; 287 default: 288 usage(); 289 ret = 1; 290 goto done; 291 } 292 } 293 argc -= optind; 294 argv += optind; 295 if (sc_reader_id != NULL) { 296 if (update_card(ac, !deleting, sc_reader_id) == -1) 297 ret = 1; 298 goto done; 299 } 300 if (argc == 0) { 301 char buf[MAXPATHLEN]; 302 struct passwd *pw; 303 304 if ((pw = getpwuid(getuid())) == NULL) { 305 fprintf(stderr, "No user found with uid %u\n", 306 (u_int)getuid()); 307 ret = 1; 308 goto done; 309 } 310 311 for(i = 0; default_files[i]; i++) { 312 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, 313 default_files[i]); 314 if (do_file(ac, deleting, buf) == -1) 315 ret = 1; 316 } 317 } else { 318 for(i = 0; i < argc; i++) { 319 if (do_file(ac, deleting, argv[i]) == -1) 320 ret = 1; 321 } 322 } 323 clear_pass(); 324 325 done: 326 ssh_close_authentication_connection(ac); 327 return ret; 328 } 329