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 1.74 2005/11/12 18:37:59 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 "misc.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 /* Default lifetime (0 == forever) */ 64 static int lifetime = 0; 65 66 /* User has to confirm key use */ 67 static int confirm = 0; 68 69 /* we keep a cache of one passphrases */ 70 static char *pass = NULL; 71 static void 72 clear_pass(void) 73 { 74 if (pass) { 75 memset(pass, 0, strlen(pass)); 76 xfree(pass); 77 pass = NULL; 78 } 79 } 80 81 static int 82 delete_file(AuthenticationConnection *ac, const char *filename) 83 { 84 Key *public; 85 char *comment = NULL; 86 int ret = -1; 87 88 public = key_load_public(filename, &comment); 89 if (public == NULL) { 90 printf("Bad key file %s\n", filename); 91 return -1; 92 } 93 if (ssh_remove_identity(ac, public)) { 94 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); 95 ret = 0; 96 } else 97 fprintf(stderr, "Could not remove identity: %s\n", filename); 98 99 key_free(public); 100 xfree(comment); 101 102 return ret; 103 } 104 105 /* Send a request to remove all identities. */ 106 static int 107 delete_all(AuthenticationConnection *ac) 108 { 109 int ret = -1; 110 111 if (ssh_remove_all_identities(ac, 1)) 112 ret = 0; 113 /* ignore error-code for ssh2 */ 114 ssh_remove_all_identities(ac, 2); 115 116 if (ret == 0) 117 fprintf(stderr, "All identities removed.\n"); 118 else 119 fprintf(stderr, "Failed to remove all identities.\n"); 120 121 return ret; 122 } 123 124 static int 125 add_file(AuthenticationConnection *ac, const char *filename) 126 { 127 struct stat st; 128 Key *private; 129 char *comment = NULL; 130 char msg[1024]; 131 int ret = -1; 132 133 if (stat(filename, &st) < 0) { 134 perror(filename); 135 return -1; 136 } 137 /* At first, try empty passphrase */ 138 private = key_load_private(filename, "", &comment); 139 if (comment == NULL) 140 comment = xstrdup(filename); 141 /* try last */ 142 if (private == NULL && pass != NULL) 143 private = key_load_private(filename, pass, NULL); 144 if (private == NULL) { 145 /* clear passphrase since it did not work */ 146 clear_pass(); 147 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", 148 comment); 149 for (;;) { 150 pass = read_passphrase(msg, RP_ALLOW_STDIN); 151 if (strcmp(pass, "") == 0) { 152 clear_pass(); 153 xfree(comment); 154 return -1; 155 } 156 private = key_load_private(filename, pass, &comment); 157 if (private != NULL) 158 break; 159 clear_pass(); 160 snprintf(msg, sizeof msg, 161 "Bad passphrase, try again for %.200s: ", comment); 162 } 163 } 164 165 if (ssh_add_identity_constrained(ac, private, comment, lifetime, 166 confirm)) { 167 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 168 ret = 0; 169 if (lifetime != 0) 170 fprintf(stderr, 171 "Lifetime set to %d seconds\n", lifetime); 172 if (confirm != 0) 173 fprintf(stderr, 174 "The user has to confirm each use of the key\n"); 175 } else if (ssh_add_identity(ac, private, comment)) { 176 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 177 ret = 0; 178 } else { 179 fprintf(stderr, "Could not add identity: %s\n", filename); 180 } 181 182 xfree(comment); 183 key_free(private); 184 185 return ret; 186 } 187 188 static int 189 update_card(AuthenticationConnection *ac, int add, const char *id) 190 { 191 char *pin; 192 int ret = -1; 193 194 pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); 195 if (pin == NULL) 196 return -1; 197 198 if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) { 199 fprintf(stderr, "Card %s: %s\n", 200 add ? "added" : "removed", id); 201 ret = 0; 202 } else { 203 fprintf(stderr, "Could not %s card: %s\n", 204 add ? "add" : "remove", id); 205 ret = -1; 206 } 207 xfree(pin); 208 return ret; 209 } 210 211 static int 212 list_identities(AuthenticationConnection *ac, int do_fp) 213 { 214 Key *key; 215 char *comment, *fp; 216 int had_identities = 0; 217 int version; 218 219 for (version = 1; version <= 2; version++) { 220 for (key = ssh_get_first_identity(ac, &comment, version); 221 key != NULL; 222 key = ssh_get_next_identity(ac, &comment, version)) { 223 had_identities = 1; 224 if (do_fp) { 225 fp = key_fingerprint(key, SSH_FP_MD5, 226 SSH_FP_HEX); 227 printf("%d %s %s (%s)\n", 228 key_size(key), fp, comment, key_type(key)); 229 xfree(fp); 230 } else { 231 if (!key_write(key, stdout)) 232 fprintf(stderr, "key_write failed"); 233 fprintf(stdout, " %s\n", comment); 234 } 235 key_free(key); 236 xfree(comment); 237 } 238 } 239 if (!had_identities) { 240 printf("The agent has no identities.\n"); 241 return -1; 242 } 243 return 0; 244 } 245 246 static int 247 lock_agent(AuthenticationConnection *ac, int lock) 248 { 249 char prompt[100], *p1, *p2; 250 int passok = 1, ret = -1; 251 252 strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); 253 p1 = read_passphrase(prompt, RP_ALLOW_STDIN); 254 if (lock) { 255 strlcpy(prompt, "Again: ", sizeof prompt); 256 p2 = read_passphrase(prompt, RP_ALLOW_STDIN); 257 if (strcmp(p1, p2) != 0) { 258 fprintf(stderr, "Passwords do not match.\n"); 259 passok = 0; 260 } 261 memset(p2, 0, strlen(p2)); 262 xfree(p2); 263 } 264 if (passok && ssh_lock_agent(ac, lock, p1)) { 265 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); 266 ret = 0; 267 } else 268 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); 269 memset(p1, 0, strlen(p1)); 270 xfree(p1); 271 return (ret); 272 } 273 274 static int 275 do_file(AuthenticationConnection *ac, int deleting, char *file) 276 { 277 if (deleting) { 278 if (delete_file(ac, file) == -1) 279 return -1; 280 } else { 281 if (add_file(ac, file) == -1) 282 return -1; 283 } 284 return 0; 285 } 286 287 static void 288 usage(void) 289 { 290 fprintf(stderr, "Usage: %s [options]\n", __progname); 291 fprintf(stderr, "Options:\n"); 292 fprintf(stderr, " -l List fingerprints of all identities.\n"); 293 fprintf(stderr, " -L List public key parameters of all identities.\n"); 294 fprintf(stderr, " -d Delete identity.\n"); 295 fprintf(stderr, " -D Delete all identities.\n"); 296 fprintf(stderr, " -x Lock agent.\n"); 297 fprintf(stderr, " -X Unlock agent.\n"); 298 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); 299 fprintf(stderr, " -c Require confirmation to sign using identities\n"); 300 #ifdef SMARTCARD 301 fprintf(stderr, " -s reader Add key in smartcard reader.\n"); 302 fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); 303 #endif 304 } 305 306 int 307 main(int argc, char **argv) 308 { 309 extern char *optarg; 310 extern int optind; 311 AuthenticationConnection *ac = NULL; 312 char *sc_reader_id = NULL; 313 int i, ch, deleting = 0, ret = 0; 314 315 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 316 sanitise_stdfd(); 317 318 __progname = ssh_get_progname(argv[0]); 319 init_rng(); 320 seed_rng(); 321 322 SSLeay_add_all_algorithms(); 323 324 /* At first, get a connection to the authentication agent. */ 325 ac = ssh_get_authentication_connection(); 326 if (ac == NULL) { 327 fprintf(stderr, 328 "Could not open a connection to your authentication agent.\n"); 329 exit(2); 330 } 331 while ((ch = getopt(argc, argv, "lLcdDxXe:s:t:")) != -1) { 332 switch (ch) { 333 case 'l': 334 case 'L': 335 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) 336 ret = 1; 337 goto done; 338 break; 339 case 'x': 340 case 'X': 341 if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) 342 ret = 1; 343 goto done; 344 break; 345 case 'c': 346 confirm = 1; 347 break; 348 case 'd': 349 deleting = 1; 350 break; 351 case 'D': 352 if (delete_all(ac) == -1) 353 ret = 1; 354 goto done; 355 break; 356 case 's': 357 sc_reader_id = optarg; 358 break; 359 case 'e': 360 deleting = 1; 361 sc_reader_id = optarg; 362 break; 363 case 't': 364 if ((lifetime = convtime(optarg)) == -1) { 365 fprintf(stderr, "Invalid lifetime\n"); 366 ret = 1; 367 goto done; 368 } 369 break; 370 default: 371 usage(); 372 ret = 1; 373 goto done; 374 } 375 } 376 argc -= optind; 377 argv += optind; 378 if (sc_reader_id != NULL) { 379 if (update_card(ac, !deleting, sc_reader_id) == -1) 380 ret = 1; 381 goto done; 382 } 383 if (argc == 0) { 384 char buf[MAXPATHLEN]; 385 struct passwd *pw; 386 struct stat st; 387 int count = 0; 388 389 if ((pw = getpwuid(getuid())) == NULL) { 390 fprintf(stderr, "No user found with uid %u\n", 391 (u_int)getuid()); 392 ret = 1; 393 goto done; 394 } 395 396 for (i = 0; default_files[i]; i++) { 397 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, 398 default_files[i]); 399 if (stat(buf, &st) < 0) 400 continue; 401 if (do_file(ac, deleting, buf) == -1) 402 ret = 1; 403 else 404 count++; 405 } 406 if (count == 0) 407 ret = 1; 408 } else { 409 for (i = 0; i < argc; i++) { 410 if (do_file(ac, deleting, argv[i]) == -1) 411 ret = 1; 412 } 413 } 414 clear_pass(); 415 416 done: 417 ssh_close_authentication_connection(ac); 418 return ret; 419 } 420