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 1.63 2002/09/19 15:51:23 markus Exp $"); 39 RCSID("$FreeBSD: src/crypto/openssh/ssh-add.c,v 1.1.1.1.2.6 2003/02/03 17:31:07 des Exp $"); 40 41 #include <openssl/evp.h> 42 43 #include "ssh.h" 44 #include "rsa.h" 45 #include "log.h" 46 #include "xmalloc.h" 47 #include "key.h" 48 #include "authfd.h" 49 #include "authfile.h" 50 #include "pathnames.h" 51 #include "readpass.h" 52 #include "misc.h" 53 54 #ifdef HAVE___PROGNAME 55 extern char *__progname; 56 #else 57 char *__progname; 58 #endif 59 60 /* argv0 */ 61 extern char *__progname; 62 63 /* Default files to add */ 64 static char *default_files[] = { 65 _PATH_SSH_CLIENT_ID_RSA, 66 _PATH_SSH_CLIENT_ID_DSA, 67 _PATH_SSH_CLIENT_IDENTITY, 68 NULL 69 }; 70 71 /* Default lifetime (0 == forever) */ 72 static int lifetime = 0; 73 74 /* we keep a cache of one passphrases */ 75 static char *pass = NULL; 76 static void 77 clear_pass(void) 78 { 79 if (pass) { 80 memset(pass, 0, strlen(pass)); 81 xfree(pass); 82 pass = NULL; 83 } 84 } 85 86 static int 87 delete_file(AuthenticationConnection *ac, const char *filename) 88 { 89 Key *public; 90 char *comment = NULL; 91 int ret = -1; 92 93 public = key_load_public(filename, &comment); 94 if (public == NULL) { 95 printf("Bad key file %s\n", filename); 96 return -1; 97 } 98 if (ssh_remove_identity(ac, public)) { 99 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); 100 ret = 0; 101 } else 102 fprintf(stderr, "Could not remove identity: %s\n", filename); 103 104 key_free(public); 105 xfree(comment); 106 107 return ret; 108 } 109 110 /* Send a request to remove all identities. */ 111 static int 112 delete_all(AuthenticationConnection *ac) 113 { 114 int ret = -1; 115 116 if (ssh_remove_all_identities(ac, 1)) 117 ret = 0; 118 /* ignore error-code for ssh2 */ 119 ssh_remove_all_identities(ac, 2); 120 121 if (ret == 0) 122 fprintf(stderr, "All identities removed.\n"); 123 else 124 fprintf(stderr, "Failed to remove all identities.\n"); 125 126 return ret; 127 } 128 129 static int 130 add_file(AuthenticationConnection *ac, const char *filename) 131 { 132 struct stat st; 133 Key *private; 134 char *comment = NULL; 135 char msg[1024]; 136 int ret = -1; 137 138 if (stat(filename, &st) < 0) { 139 perror(filename); 140 return -1; 141 } 142 /* At first, try empty passphrase */ 143 private = key_load_private(filename, "", &comment); 144 if (comment == NULL) 145 comment = xstrdup(filename); 146 /* try last */ 147 if (private == NULL && pass != NULL) 148 private = key_load_private(filename, pass, NULL); 149 if (private == NULL) { 150 /* clear passphrase since it did not work */ 151 clear_pass(); 152 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", 153 comment); 154 for (;;) { 155 pass = read_passphrase(msg, RP_ALLOW_STDIN); 156 if (strcmp(pass, "") == 0) { 157 clear_pass(); 158 xfree(comment); 159 return -1; 160 } 161 private = key_load_private(filename, pass, &comment); 162 if (private != NULL) 163 break; 164 clear_pass(); 165 strlcpy(msg, "Bad passphrase, try again: ", sizeof msg); 166 } 167 } 168 169 if (ssh_add_identity_constrained(ac, private, comment, lifetime)) { 170 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 171 ret = 0; 172 if (lifetime != 0) 173 fprintf(stderr, 174 "Lifetime set to %d seconds\n", lifetime); 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; 192 193 pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); 194 if (pin == NULL) 195 return -1; 196 197 if (ssh_update_card(ac, add, id, pin)) { 198 fprintf(stderr, "Card %s: %s\n", 199 add ? "added" : "removed", id); 200 return 0; 201 } else { 202 fprintf(stderr, "Could not %s card: %s\n", 203 add ? "add" : "remove", id); 204 return -1; 205 } 206 } 207 208 static int 209 list_identities(AuthenticationConnection *ac, int do_fp) 210 { 211 Key *key; 212 char *comment, *fp; 213 int had_identities = 0; 214 int version; 215 216 for (version = 1; version <= 2; version++) { 217 for (key = ssh_get_first_identity(ac, &comment, version); 218 key != NULL; 219 key = ssh_get_next_identity(ac, &comment, version)) { 220 had_identities = 1; 221 if (do_fp) { 222 fp = key_fingerprint(key, SSH_FP_MD5, 223 SSH_FP_HEX); 224 printf("%d %s %s (%s)\n", 225 key_size(key), fp, comment, key_type(key)); 226 xfree(fp); 227 } else { 228 if (!key_write(key, stdout)) 229 fprintf(stderr, "key_write failed"); 230 fprintf(stdout, " %s\n", comment); 231 } 232 key_free(key); 233 xfree(comment); 234 } 235 } 236 if (!had_identities) { 237 printf("The agent has no identities.\n"); 238 return -1; 239 } 240 return 0; 241 } 242 243 static int 244 lock_agent(AuthenticationConnection *ac, int lock) 245 { 246 char prompt[100], *p1, *p2; 247 int passok = 1, ret = -1; 248 249 strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); 250 p1 = read_passphrase(prompt, RP_ALLOW_STDIN); 251 if (lock) { 252 strlcpy(prompt, "Again: ", sizeof prompt); 253 p2 = read_passphrase(prompt, RP_ALLOW_STDIN); 254 if (strcmp(p1, p2) != 0) { 255 fprintf(stderr, "Passwords do not match.\n"); 256 passok = 0; 257 } 258 memset(p2, 0, strlen(p2)); 259 xfree(p2); 260 } 261 if (passok && ssh_lock_agent(ac, lock, p1)) { 262 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); 263 ret = 0; 264 } else 265 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); 266 memset(p1, 0, strlen(p1)); 267 xfree(p1); 268 return (ret); 269 } 270 271 static int 272 do_file(AuthenticationConnection *ac, int deleting, char *file) 273 { 274 if (deleting) { 275 if (delete_file(ac, file) == -1) 276 return -1; 277 } else { 278 if (add_file(ac, file) == -1) 279 return -1; 280 } 281 return 0; 282 } 283 284 static void 285 usage(void) 286 { 287 fprintf(stderr, "Usage: %s [options]\n", __progname); 288 fprintf(stderr, "Options:\n"); 289 fprintf(stderr, " -l List fingerprints of all identities.\n"); 290 fprintf(stderr, " -L List public key parameters of all identities.\n"); 291 fprintf(stderr, " -d Delete identity.\n"); 292 fprintf(stderr, " -D Delete all identities.\n"); 293 fprintf(stderr, " -x Lock agent.\n"); 294 fprintf(stderr, " -X Unlock agent.\n"); 295 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); 296 #ifdef SMARTCARD 297 fprintf(stderr, " -s reader Add key in smartcard reader.\n"); 298 fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); 299 #endif 300 } 301 302 int 303 main(int argc, char **argv) 304 { 305 extern char *optarg; 306 extern int optind; 307 AuthenticationConnection *ac = NULL; 308 char *sc_reader_id = NULL; 309 int i, ch, deleting = 0, ret = 0; 310 311 __progname = get_progname(argv[0]); 312 init_rng(); 313 seed_rng(); 314 315 SSLeay_add_all_algorithms(); 316 317 /* At first, get a connection to the authentication agent. */ 318 ac = ssh_get_authentication_connection(); 319 if (ac == NULL) { 320 fprintf(stderr, "Could not open a connection to your authentication agent.\n"); 321 exit(2); 322 } 323 while ((ch = getopt(argc, argv, "lLdDxXe:s:t:")) != -1) { 324 switch (ch) { 325 case 'l': 326 case 'L': 327 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) 328 ret = 1; 329 goto done; 330 break; 331 case 'x': 332 case 'X': 333 if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) 334 ret = 1; 335 goto done; 336 break; 337 case 'd': 338 deleting = 1; 339 break; 340 case 'D': 341 if (delete_all(ac) == -1) 342 ret = 1; 343 goto done; 344 break; 345 case 's': 346 sc_reader_id = optarg; 347 break; 348 case 'e': 349 deleting = 1; 350 sc_reader_id = optarg; 351 break; 352 case 't': 353 if ((lifetime = convtime(optarg)) == -1) { 354 fprintf(stderr, "Invalid lifetime\n"); 355 ret = 1; 356 goto done; 357 } 358 break; 359 default: 360 usage(); 361 ret = 1; 362 goto done; 363 } 364 } 365 argc -= optind; 366 argv += optind; 367 if (sc_reader_id != NULL) { 368 if (update_card(ac, !deleting, sc_reader_id) == -1) 369 ret = 1; 370 goto done; 371 } 372 if (argc == 0) { 373 char buf[MAXPATHLEN]; 374 struct passwd *pw; 375 struct stat st; 376 int count = 0; 377 378 if ((pw = getpwuid(getuid())) == NULL) { 379 fprintf(stderr, "No user found with uid %u\n", 380 (u_int)getuid()); 381 ret = 1; 382 goto done; 383 } 384 385 for(i = 0; default_files[i]; i++) { 386 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, 387 default_files[i]); 388 if (stat(buf, &st) < 0) 389 continue; 390 if (do_file(ac, deleting, buf) == -1) 391 ret = 1; 392 else 393 count++; 394 } 395 if (count == 0) 396 ret = 1; 397 } else { 398 for(i = 0; i < argc; i++) { 399 if (do_file(ac, deleting, argv[i]) == -1) 400 ret = 1; 401 } 402 } 403 clear_pass(); 404 405 done: 406 ssh_close_authentication_connection(ac); 407 return ret; 408 } 409