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 1.66 2003/03/05 22:33:43 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 #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 /* User has to confirm key use */ 74 static int confirm = 0; 75 76 /* we keep a cache of one passphrases */ 77 static char *pass = NULL; 78 static void 79 clear_pass(void) 80 { 81 if (pass) { 82 memset(pass, 0, strlen(pass)); 83 xfree(pass); 84 pass = NULL; 85 } 86 } 87 88 static int 89 delete_file(AuthenticationConnection *ac, const char *filename) 90 { 91 Key *public; 92 char *comment = NULL; 93 int ret = -1; 94 95 public = key_load_public(filename, &comment); 96 if (public == NULL) { 97 printf("Bad key file %s\n", filename); 98 return -1; 99 } 100 if (ssh_remove_identity(ac, public)) { 101 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); 102 ret = 0; 103 } else 104 fprintf(stderr, "Could not remove identity: %s\n", filename); 105 106 key_free(public); 107 xfree(comment); 108 109 return ret; 110 } 111 112 /* Send a request to remove all identities. */ 113 static int 114 delete_all(AuthenticationConnection *ac) 115 { 116 int ret = -1; 117 118 if (ssh_remove_all_identities(ac, 1)) 119 ret = 0; 120 /* ignore error-code for ssh2 */ 121 ssh_remove_all_identities(ac, 2); 122 123 if (ret == 0) 124 fprintf(stderr, "All identities removed.\n"); 125 else 126 fprintf(stderr, "Failed to remove all identities.\n"); 127 128 return ret; 129 } 130 131 static int 132 add_file(AuthenticationConnection *ac, const char *filename) 133 { 134 struct stat st; 135 Key *private; 136 char *comment = NULL; 137 char msg[1024]; 138 int ret = -1; 139 140 if (stat(filename, &st) < 0) { 141 perror(filename); 142 return -1; 143 } 144 /* At first, try empty passphrase */ 145 private = key_load_private(filename, "", &comment); 146 if (comment == NULL) 147 comment = xstrdup(filename); 148 /* try last */ 149 if (private == NULL && pass != NULL) 150 private = key_load_private(filename, pass, NULL); 151 if (private == NULL) { 152 /* clear passphrase since it did not work */ 153 clear_pass(); 154 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", 155 comment); 156 for (;;) { 157 pass = read_passphrase(msg, RP_ALLOW_STDIN); 158 if (strcmp(pass, "") == 0) { 159 clear_pass(); 160 xfree(comment); 161 return -1; 162 } 163 private = key_load_private(filename, pass, &comment); 164 if (private != NULL) 165 break; 166 clear_pass(); 167 strlcpy(msg, "Bad passphrase, try again: ", sizeof msg); 168 } 169 } 170 171 if (ssh_add_identity_constrained(ac, private, comment, lifetime, 172 confirm)) { 173 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 174 ret = 0; 175 if (lifetime != 0) 176 fprintf(stderr, 177 "Lifetime set to %d seconds\n", lifetime); 178 if (confirm != 0) 179 fprintf(stderr, 180 "The user has to confirm each use of the key\n"); 181 } else if (ssh_add_identity(ac, private, comment)) { 182 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 183 ret = 0; 184 } else { 185 fprintf(stderr, "Could not add identity: %s\n", filename); 186 } 187 188 xfree(comment); 189 key_free(private); 190 191 return ret; 192 } 193 194 static int 195 update_card(AuthenticationConnection *ac, int add, const char *id) 196 { 197 char *pin; 198 int ret = -1; 199 200 pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); 201 if (pin == NULL) 202 return -1; 203 204 if (ssh_update_card(ac, add, id, pin)) { 205 fprintf(stderr, "Card %s: %s\n", 206 add ? "added" : "removed", id); 207 ret = 0; 208 } else { 209 fprintf(stderr, "Could not %s card: %s\n", 210 add ? "add" : "remove", id); 211 ret = -1; 212 } 213 xfree(pin); 214 return ret; 215 } 216 217 static int 218 list_identities(AuthenticationConnection *ac, int do_fp) 219 { 220 Key *key; 221 char *comment, *fp; 222 int had_identities = 0; 223 int version; 224 225 for (version = 1; version <= 2; version++) { 226 for (key = ssh_get_first_identity(ac, &comment, version); 227 key != NULL; 228 key = ssh_get_next_identity(ac, &comment, version)) { 229 had_identities = 1; 230 if (do_fp) { 231 fp = key_fingerprint(key, SSH_FP_MD5, 232 SSH_FP_HEX); 233 printf("%d %s %s (%s)\n", 234 key_size(key), fp, comment, key_type(key)); 235 xfree(fp); 236 } else { 237 if (!key_write(key, stdout)) 238 fprintf(stderr, "key_write failed"); 239 fprintf(stdout, " %s\n", comment); 240 } 241 key_free(key); 242 xfree(comment); 243 } 244 } 245 if (!had_identities) { 246 printf("The agent has no identities.\n"); 247 return -1; 248 } 249 return 0; 250 } 251 252 static int 253 lock_agent(AuthenticationConnection *ac, int lock) 254 { 255 char prompt[100], *p1, *p2; 256 int passok = 1, ret = -1; 257 258 strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); 259 p1 = read_passphrase(prompt, RP_ALLOW_STDIN); 260 if (lock) { 261 strlcpy(prompt, "Again: ", sizeof prompt); 262 p2 = read_passphrase(prompt, RP_ALLOW_STDIN); 263 if (strcmp(p1, p2) != 0) { 264 fprintf(stderr, "Passwords do not match.\n"); 265 passok = 0; 266 } 267 memset(p2, 0, strlen(p2)); 268 xfree(p2); 269 } 270 if (passok && ssh_lock_agent(ac, lock, p1)) { 271 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); 272 ret = 0; 273 } else 274 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); 275 memset(p1, 0, strlen(p1)); 276 xfree(p1); 277 return (ret); 278 } 279 280 static int 281 do_file(AuthenticationConnection *ac, int deleting, char *file) 282 { 283 if (deleting) { 284 if (delete_file(ac, file) == -1) 285 return -1; 286 } else { 287 if (add_file(ac, file) == -1) 288 return -1; 289 } 290 return 0; 291 } 292 293 static void 294 usage(void) 295 { 296 fprintf(stderr, "Usage: %s [options]\n", __progname); 297 fprintf(stderr, "Options:\n"); 298 fprintf(stderr, " -l List fingerprints of all identities.\n"); 299 fprintf(stderr, " -L List public key parameters of all identities.\n"); 300 fprintf(stderr, " -d Delete identity.\n"); 301 fprintf(stderr, " -D Delete all identities.\n"); 302 fprintf(stderr, " -x Lock agent.\n"); 303 fprintf(stderr, " -X Unlock agent.\n"); 304 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); 305 fprintf(stderr, " -c Require confirmation to sign using identities\n"); 306 #ifdef SMARTCARD 307 fprintf(stderr, " -s reader Add key in smartcard reader.\n"); 308 fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); 309 #endif 310 } 311 312 int 313 main(int argc, char **argv) 314 { 315 extern char *optarg; 316 extern int optind; 317 AuthenticationConnection *ac = NULL; 318 char *sc_reader_id = NULL; 319 int i, ch, deleting = 0, ret = 0; 320 321 __progname = get_progname(argv[0]); 322 init_rng(); 323 seed_rng(); 324 325 SSLeay_add_all_algorithms(); 326 327 /* At first, get a connection to the authentication agent. */ 328 ac = ssh_get_authentication_connection(); 329 if (ac == NULL) { 330 fprintf(stderr, "Could not open a connection to your authentication agent.\n"); 331 exit(2); 332 } 333 while ((ch = getopt(argc, argv, "lLcdDxXe:s:t:")) != -1) { 334 switch (ch) { 335 case 'l': 336 case 'L': 337 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) 338 ret = 1; 339 goto done; 340 break; 341 case 'x': 342 case 'X': 343 if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) 344 ret = 1; 345 goto done; 346 break; 347 case 'c': 348 confirm = 1; 349 break; 350 case 'd': 351 deleting = 1; 352 break; 353 case 'D': 354 if (delete_all(ac) == -1) 355 ret = 1; 356 goto done; 357 break; 358 case 's': 359 sc_reader_id = optarg; 360 break; 361 case 'e': 362 deleting = 1; 363 sc_reader_id = optarg; 364 break; 365 case 't': 366 if ((lifetime = convtime(optarg)) == -1) { 367 fprintf(stderr, "Invalid lifetime\n"); 368 ret = 1; 369 goto done; 370 } 371 break; 372 default: 373 usage(); 374 ret = 1; 375 goto done; 376 } 377 } 378 argc -= optind; 379 argv += optind; 380 if (sc_reader_id != NULL) { 381 if (update_card(ac, !deleting, sc_reader_id) == -1) 382 ret = 1; 383 goto done; 384 } 385 if (argc == 0) { 386 char buf[MAXPATHLEN]; 387 struct passwd *pw; 388 struct stat st; 389 int count = 0; 390 391 if ((pw = getpwuid(getuid())) == NULL) { 392 fprintf(stderr, "No user found with uid %u\n", 393 (u_int)getuid()); 394 ret = 1; 395 goto done; 396 } 397 398 for(i = 0; default_files[i]; i++) { 399 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, 400 default_files[i]); 401 if (stat(buf, &st) < 0) 402 continue; 403 if (do_file(ac, deleting, buf) == -1) 404 ret = 1; 405 else 406 count++; 407 } 408 if (count == 0) 409 ret = 1; 410 } else { 411 for(i = 0; i < argc; i++) { 412 if (do_file(ac, deleting, argv[i]) == -1) 413 ret = 1; 414 } 415 } 416 clear_pass(); 417 418 done: 419 ssh_close_authentication_connection(ac); 420 return ret; 421 } 422