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 $"); 40 RCSID("$DragonFly: src/crypto/openssh/Attic/ssh-add.c,v 1.2 2003/06/17 04:24:36 dillon Exp $"); 41 42 #include <openssl/evp.h> 43 44 #include "ssh.h" 45 #include "rsa.h" 46 #include "log.h" 47 #include "xmalloc.h" 48 #include "key.h" 49 #include "authfd.h" 50 #include "authfile.h" 51 #include "pathnames.h" 52 #include "readpass.h" 53 #include "misc.h" 54 55 #ifdef HAVE___PROGNAME 56 extern char *__progname; 57 #else 58 char *__progname; 59 #endif 60 61 /* argv0 */ 62 extern char *__progname; 63 64 /* Default files to add */ 65 static char *default_files[] = { 66 _PATH_SSH_CLIENT_ID_RSA, 67 _PATH_SSH_CLIENT_ID_DSA, 68 _PATH_SSH_CLIENT_IDENTITY, 69 NULL 70 }; 71 72 /* Default lifetime (0 == forever) */ 73 static int lifetime = 0; 74 75 /* we keep a cache of one passphrases */ 76 static char *pass = NULL; 77 static void 78 clear_pass(void) 79 { 80 if (pass) { 81 memset(pass, 0, strlen(pass)); 82 xfree(pass); 83 pass = NULL; 84 } 85 } 86 87 static int 88 delete_file(AuthenticationConnection *ac, const char *filename) 89 { 90 Key *public; 91 char *comment = NULL; 92 int ret = -1; 93 94 public = key_load_public(filename, &comment); 95 if (public == NULL) { 96 printf("Bad key file %s\n", filename); 97 return -1; 98 } 99 if (ssh_remove_identity(ac, public)) { 100 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); 101 ret = 0; 102 } else 103 fprintf(stderr, "Could not remove identity: %s\n", filename); 104 105 key_free(public); 106 xfree(comment); 107 108 return ret; 109 } 110 111 /* Send a request to remove all identities. */ 112 static int 113 delete_all(AuthenticationConnection *ac) 114 { 115 int ret = -1; 116 117 if (ssh_remove_all_identities(ac, 1)) 118 ret = 0; 119 /* ignore error-code for ssh2 */ 120 ssh_remove_all_identities(ac, 2); 121 122 if (ret == 0) 123 fprintf(stderr, "All identities removed.\n"); 124 else 125 fprintf(stderr, "Failed to remove all identities.\n"); 126 127 return ret; 128 } 129 130 static int 131 add_file(AuthenticationConnection *ac, const char *filename) 132 { 133 struct stat st; 134 Key *private; 135 char *comment = NULL; 136 char msg[1024]; 137 int ret = -1; 138 139 if (stat(filename, &st) < 0) { 140 perror(filename); 141 return -1; 142 } 143 /* At first, try empty passphrase */ 144 private = key_load_private(filename, "", &comment); 145 if (comment == NULL) 146 comment = xstrdup(filename); 147 /* try last */ 148 if (private == NULL && pass != NULL) 149 private = key_load_private(filename, pass, NULL); 150 if (private == NULL) { 151 /* clear passphrase since it did not work */ 152 clear_pass(); 153 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", 154 comment); 155 for (;;) { 156 pass = read_passphrase(msg, RP_ALLOW_STDIN); 157 if (strcmp(pass, "") == 0) { 158 clear_pass(); 159 xfree(comment); 160 return -1; 161 } 162 private = key_load_private(filename, pass, &comment); 163 if (private != NULL) 164 break; 165 clear_pass(); 166 strlcpy(msg, "Bad passphrase, try again: ", sizeof msg); 167 } 168 } 169 170 if (ssh_add_identity_constrained(ac, private, comment, lifetime)) { 171 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 172 ret = 0; 173 if (lifetime != 0) 174 fprintf(stderr, 175 "Lifetime set to %d seconds\n", lifetime); 176 } else if (ssh_add_identity(ac, private, comment)) { 177 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 178 ret = 0; 179 } else { 180 fprintf(stderr, "Could not add identity: %s\n", filename); 181 } 182 183 xfree(comment); 184 key_free(private); 185 186 return ret; 187 } 188 189 static int 190 update_card(AuthenticationConnection *ac, int add, const char *id) 191 { 192 char *pin; 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)) { 199 fprintf(stderr, "Card %s: %s\n", 200 add ? "added" : "removed", id); 201 return 0; 202 } else { 203 fprintf(stderr, "Could not %s card: %s\n", 204 add ? "add" : "remove", id); 205 return -1; 206 } 207 } 208 209 static int 210 list_identities(AuthenticationConnection *ac, int do_fp) 211 { 212 Key *key; 213 char *comment, *fp; 214 int had_identities = 0; 215 int version; 216 217 for (version = 1; version <= 2; version++) { 218 for (key = ssh_get_first_identity(ac, &comment, version); 219 key != NULL; 220 key = ssh_get_next_identity(ac, &comment, version)) { 221 had_identities = 1; 222 if (do_fp) { 223 fp = key_fingerprint(key, SSH_FP_MD5, 224 SSH_FP_HEX); 225 printf("%d %s %s (%s)\n", 226 key_size(key), fp, comment, key_type(key)); 227 xfree(fp); 228 } else { 229 if (!key_write(key, stdout)) 230 fprintf(stderr, "key_write failed"); 231 fprintf(stdout, " %s\n", comment); 232 } 233 key_free(key); 234 xfree(comment); 235 } 236 } 237 if (!had_identities) { 238 printf("The agent has no identities.\n"); 239 return -1; 240 } 241 return 0; 242 } 243 244 static int 245 lock_agent(AuthenticationConnection *ac, int lock) 246 { 247 char prompt[100], *p1, *p2; 248 int passok = 1, ret = -1; 249 250 strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); 251 p1 = read_passphrase(prompt, RP_ALLOW_STDIN); 252 if (lock) { 253 strlcpy(prompt, "Again: ", sizeof prompt); 254 p2 = read_passphrase(prompt, RP_ALLOW_STDIN); 255 if (strcmp(p1, p2) != 0) { 256 fprintf(stderr, "Passwords do not match.\n"); 257 passok = 0; 258 } 259 memset(p2, 0, strlen(p2)); 260 xfree(p2); 261 } 262 if (passok && ssh_lock_agent(ac, lock, p1)) { 263 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); 264 ret = 0; 265 } else 266 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); 267 memset(p1, 0, strlen(p1)); 268 xfree(p1); 269 return (ret); 270 } 271 272 static int 273 do_file(AuthenticationConnection *ac, int deleting, char *file) 274 { 275 if (deleting) { 276 if (delete_file(ac, file) == -1) 277 return -1; 278 } else { 279 if (add_file(ac, file) == -1) 280 return -1; 281 } 282 return 0; 283 } 284 285 static void 286 usage(void) 287 { 288 fprintf(stderr, "Usage: %s [options]\n", __progname); 289 fprintf(stderr, "Options:\n"); 290 fprintf(stderr, " -l List fingerprints of all identities.\n"); 291 fprintf(stderr, " -L List public key parameters of all identities.\n"); 292 fprintf(stderr, " -d Delete identity.\n"); 293 fprintf(stderr, " -D Delete all identities.\n"); 294 fprintf(stderr, " -x Lock agent.\n"); 295 fprintf(stderr, " -X Unlock agent.\n"); 296 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); 297 #ifdef SMARTCARD 298 fprintf(stderr, " -s reader Add key in smartcard reader.\n"); 299 fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); 300 #endif 301 } 302 303 int 304 main(int argc, char **argv) 305 { 306 extern char *optarg; 307 extern int optind; 308 AuthenticationConnection *ac = NULL; 309 char *sc_reader_id = NULL; 310 int i, ch, deleting = 0, ret = 0; 311 312 __progname = get_progname(argv[0]); 313 init_rng(); 314 seed_rng(); 315 316 SSLeay_add_all_algorithms(); 317 318 /* At first, get a connection to the authentication agent. */ 319 ac = ssh_get_authentication_connection(); 320 if (ac == NULL) { 321 fprintf(stderr, "Could not open a connection to your authentication agent.\n"); 322 exit(2); 323 } 324 while ((ch = getopt(argc, argv, "lLdDxXe:s:t:")) != -1) { 325 switch (ch) { 326 case 'l': 327 case 'L': 328 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) 329 ret = 1; 330 goto done; 331 break; 332 case 'x': 333 case 'X': 334 if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) 335 ret = 1; 336 goto done; 337 break; 338 case 'd': 339 deleting = 1; 340 break; 341 case 'D': 342 if (delete_all(ac) == -1) 343 ret = 1; 344 goto done; 345 break; 346 case 's': 347 sc_reader_id = optarg; 348 break; 349 case 'e': 350 deleting = 1; 351 sc_reader_id = optarg; 352 break; 353 case 't': 354 if ((lifetime = convtime(optarg)) == -1) { 355 fprintf(stderr, "Invalid lifetime\n"); 356 ret = 1; 357 goto done; 358 } 359 break; 360 default: 361 usage(); 362 ret = 1; 363 goto done; 364 } 365 } 366 argc -= optind; 367 argv += optind; 368 if (sc_reader_id != NULL) { 369 if (update_card(ac, !deleting, sc_reader_id) == -1) 370 ret = 1; 371 goto done; 372 } 373 if (argc == 0) { 374 char buf[MAXPATHLEN]; 375 struct passwd *pw; 376 struct stat st; 377 int count = 0; 378 379 if ((pw = getpwuid(getuid())) == NULL) { 380 fprintf(stderr, "No user found with uid %u\n", 381 (u_int)getuid()); 382 ret = 1; 383 goto done; 384 } 385 386 for(i = 0; default_files[i]; i++) { 387 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, 388 default_files[i]); 389 if (stat(buf, &st) < 0) 390 continue; 391 if (do_file(ac, deleting, buf) == -1) 392 ret = 1; 393 else 394 count++; 395 } 396 if (count == 0) 397 ret = 1; 398 } else { 399 for(i = 0; i < argc; i++) { 400 if (do_file(ac, deleting, argv[i]) == -1) 401 ret = 1; 402 } 403 } 404 clear_pass(); 405 406 done: 407 ssh_close_authentication_connection(ac); 408 return ret; 409 } 410