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 1.61 2002/06/19 00:27:55 deraadt 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 #include "misc.h" 52 53 #ifdef HAVE___PROGNAME 54 extern char *__progname; 55 #else 56 char *__progname; 57 #endif 58 59 /* argv0 */ 60 extern char *__progname; 61 62 /* Default files to add */ 63 static char *default_files[] = { 64 _PATH_SSH_CLIENT_ID_RSA, 65 _PATH_SSH_CLIENT_ID_DSA, 66 _PATH_SSH_CLIENT_IDENTITY, 67 NULL 68 }; 69 70 /* Default lifetime (0 == forever) */ 71 static int lifetime = 0; 72 73 /* we keep a cache of one passphrases */ 74 static char *pass = NULL; 75 static void 76 clear_pass(void) 77 { 78 if (pass) { 79 memset(pass, 0, strlen(pass)); 80 xfree(pass); 81 pass = NULL; 82 } 83 } 84 85 static int 86 delete_file(AuthenticationConnection *ac, const char *filename) 87 { 88 Key *public; 89 char *comment = NULL; 90 int ret = -1; 91 92 public = key_load_public(filename, &comment); 93 if (public == NULL) { 94 printf("Bad key file %s\n", filename); 95 return -1; 96 } 97 if (ssh_remove_identity(ac, public)) { 98 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); 99 ret = 0; 100 } else 101 fprintf(stderr, "Could not remove identity: %s\n", filename); 102 103 key_free(public); 104 xfree(comment); 105 106 return ret; 107 } 108 109 /* Send a request to remove all identities. */ 110 static int 111 delete_all(AuthenticationConnection *ac) 112 { 113 int ret = -1; 114 115 if (ssh_remove_all_identities(ac, 1)) 116 ret = 0; 117 /* ignore error-code for ssh2 */ 118 ssh_remove_all_identities(ac, 2); 119 120 if (ret == 0) 121 fprintf(stderr, "All identities removed.\n"); 122 else 123 fprintf(stderr, "Failed to remove all identities.\n"); 124 125 return ret; 126 } 127 128 static int 129 add_file(AuthenticationConnection *ac, const char *filename) 130 { 131 struct stat st; 132 Key *private; 133 char *comment = NULL; 134 char msg[1024]; 135 int ret = -1; 136 137 if (stat(filename, &st) < 0) { 138 perror(filename); 139 return -1; 140 } 141 /* At first, try empty passphrase */ 142 private = key_load_private(filename, "", &comment); 143 if (comment == NULL) 144 comment = xstrdup(filename); 145 /* try last */ 146 if (private == NULL && pass != NULL) 147 private = key_load_private(filename, pass, NULL); 148 if (private == NULL) { 149 /* clear passphrase since it did not work */ 150 clear_pass(); 151 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", 152 comment); 153 for (;;) { 154 pass = read_passphrase(msg, RP_ALLOW_STDIN); 155 if (strcmp(pass, "") == 0) { 156 clear_pass(); 157 xfree(comment); 158 return -1; 159 } 160 private = key_load_private(filename, pass, &comment); 161 if (private != NULL) 162 break; 163 clear_pass(); 164 strlcpy(msg, "Bad passphrase, try again: ", sizeof msg); 165 } 166 } 167 168 if (ssh_add_identity_constrained(ac, private, comment, lifetime)) { 169 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 170 ret = 0; 171 if (lifetime != 0) 172 fprintf(stderr, 173 "Lifetime set to %d seconds\n", lifetime); 174 } else if (ssh_add_identity(ac, private, comment)) { 175 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 176 ret = 0; 177 } else { 178 fprintf(stderr, "Could not add identity: %s\n", filename); 179 } 180 181 xfree(comment); 182 key_free(private); 183 184 return ret; 185 } 186 187 static int 188 update_card(AuthenticationConnection *ac, int add, const char *id) 189 { 190 char *pin; 191 192 pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); 193 if (pin == NULL) 194 return -1; 195 196 if (ssh_update_card(ac, add, id, pin)) { 197 fprintf(stderr, "Card %s: %s\n", 198 add ? "added" : "removed", id); 199 return 0; 200 } else { 201 fprintf(stderr, "Could not %s card: %s\n", 202 add ? "add" : "remove", id); 203 return -1; 204 } 205 } 206 207 static int 208 list_identities(AuthenticationConnection *ac, int do_fp) 209 { 210 Key *key; 211 char *comment, *fp; 212 int had_identities = 0; 213 int version; 214 215 for (version = 1; version <= 2; version++) { 216 for (key = ssh_get_first_identity(ac, &comment, version); 217 key != NULL; 218 key = ssh_get_next_identity(ac, &comment, version)) { 219 had_identities = 1; 220 if (do_fp) { 221 fp = key_fingerprint(key, SSH_FP_MD5, 222 SSH_FP_HEX); 223 printf("%d %s %s (%s)\n", 224 key_size(key), fp, comment, key_type(key)); 225 xfree(fp); 226 } else { 227 if (!key_write(key, stdout)) 228 fprintf(stderr, "key_write failed"); 229 fprintf(stdout, " %s\n", comment); 230 } 231 key_free(key); 232 xfree(comment); 233 } 234 } 235 if (!had_identities) { 236 printf("The agent has no identities.\n"); 237 return -1; 238 } 239 return 0; 240 } 241 242 static int 243 lock_agent(AuthenticationConnection *ac, int lock) 244 { 245 char prompt[100], *p1, *p2; 246 int passok = 1, ret = -1; 247 248 strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); 249 p1 = read_passphrase(prompt, RP_ALLOW_STDIN); 250 if (lock) { 251 strlcpy(prompt, "Again: ", sizeof prompt); 252 p2 = read_passphrase(prompt, RP_ALLOW_STDIN); 253 if (strcmp(p1, p2) != 0) { 254 fprintf(stderr, "Passwords do not match.\n"); 255 passok = 0; 256 } 257 memset(p2, 0, strlen(p2)); 258 xfree(p2); 259 } 260 if (passok && ssh_lock_agent(ac, lock, p1)) { 261 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); 262 ret = 0; 263 } else 264 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); 265 memset(p1, 0, strlen(p1)); 266 xfree(p1); 267 return -1; 268 } 269 270 static int 271 do_file(AuthenticationConnection *ac, int deleting, char *file) 272 { 273 if (deleting) { 274 if (delete_file(ac, file) == -1) 275 return -1; 276 } else { 277 if (add_file(ac, file) == -1) 278 return -1; 279 } 280 return 0; 281 } 282 283 static void 284 usage(void) 285 { 286 fprintf(stderr, "Usage: %s [options]\n", __progname); 287 fprintf(stderr, "Options:\n"); 288 fprintf(stderr, " -l List fingerprints of all identities.\n"); 289 fprintf(stderr, " -L List public key parameters of all identities.\n"); 290 fprintf(stderr, " -d Delete identity.\n"); 291 fprintf(stderr, " -D Delete all identities.\n"); 292 fprintf(stderr, " -x Lock agent.\n"); 293 fprintf(stderr, " -x Unlock agent.\n"); 294 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); 295 #ifdef SMARTCARD 296 fprintf(stderr, " -s reader Add key in smartcard reader.\n"); 297 fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); 298 #endif 299 } 300 301 int 302 main(int argc, char **argv) 303 { 304 extern char *optarg; 305 extern int optind; 306 AuthenticationConnection *ac = NULL; 307 char *sc_reader_id = NULL; 308 int i, ch, deleting = 0, ret = 0; 309 310 __progname = get_progname(argv[0]); 311 init_rng(); 312 seed_rng(); 313 314 SSLeay_add_all_algorithms(); 315 316 /* At first, get a connection to the authentication agent. */ 317 ac = ssh_get_authentication_connection(); 318 if (ac == NULL) { 319 fprintf(stderr, "Could not open a connection to your authentication agent.\n"); 320 exit(2); 321 } 322 while ((ch = getopt(argc, argv, "lLdDxXe:s:t:")) != -1) { 323 switch (ch) { 324 case 'l': 325 case 'L': 326 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) 327 ret = 1; 328 goto done; 329 break; 330 case 'x': 331 case 'X': 332 if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) 333 ret = 1; 334 goto done; 335 break; 336 case 'd': 337 deleting = 1; 338 break; 339 case 'D': 340 if (delete_all(ac) == -1) 341 ret = 1; 342 goto done; 343 break; 344 case 's': 345 sc_reader_id = optarg; 346 break; 347 case 'e': 348 deleting = 1; 349 sc_reader_id = optarg; 350 break; 351 case 't': 352 if ((lifetime = convtime(optarg)) == -1) { 353 fprintf(stderr, "Invalid lifetime\n"); 354 ret = 1; 355 goto done; 356 } 357 break; 358 default: 359 usage(); 360 ret = 1; 361 goto done; 362 } 363 } 364 argc -= optind; 365 argv += optind; 366 if (sc_reader_id != NULL) { 367 if (update_card(ac, !deleting, sc_reader_id) == -1) 368 ret = 1; 369 goto done; 370 } 371 if (argc == 0) { 372 char buf[MAXPATHLEN]; 373 struct passwd *pw; 374 struct stat st; 375 int count = 0; 376 377 if ((pw = getpwuid(getuid())) == NULL) { 378 fprintf(stderr, "No user found with uid %u\n", 379 (u_int)getuid()); 380 ret = 1; 381 goto done; 382 } 383 384 for(i = 0; default_files[i]; i++) { 385 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, 386 default_files[i]); 387 if (stat(buf, &st) < 0) 388 continue; 389 if (do_file(ac, deleting, buf) == -1) 390 ret = 1; 391 else 392 count++; 393 } 394 if (count == 0) 395 ret = 1; 396 } else { 397 for(i = 0; i < argc; i++) { 398 if (do_file(ac, deleting, argv[i]) == -1) 399 ret = 1; 400 } 401 } 402 clear_pass(); 403 404 done: 405 ssh_close_authentication_connection(ac); 406 return ret; 407 } 408