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 $"); 39 RCSID("$FreeBSD$"); 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 /* argv0 */ 55 extern char *__progname; 56 57 /* Default files to add */ 58 static char *default_files[] = { 59 _PATH_SSH_CLIENT_ID_RSA, 60 _PATH_SSH_CLIENT_ID_DSA, 61 _PATH_SSH_CLIENT_IDENTITY, 62 NULL 63 }; 64 65 /* Default lifetime (0 == forever) */ 66 static int lifetime = 0; 67 68 /* we keep a cache of one passphrases */ 69 static char *pass = NULL; 70 static void 71 clear_pass(void) 72 { 73 if (pass) { 74 memset(pass, 0, strlen(pass)); 75 xfree(pass); 76 pass = NULL; 77 } 78 } 79 80 static int 81 delete_file(AuthenticationConnection *ac, const char *filename) 82 { 83 Key *public; 84 char *comment = NULL; 85 int ret = -1; 86 87 public = key_load_public(filename, &comment); 88 if (public == NULL) { 89 printf("Bad key file %s\n", filename); 90 return -1; 91 } 92 if (ssh_remove_identity(ac, public)) { 93 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); 94 ret = 0; 95 } else 96 fprintf(stderr, "Could not remove identity: %s\n", filename); 97 98 key_free(public); 99 xfree(comment); 100 101 return ret; 102 } 103 104 /* Send a request to remove all identities. */ 105 static int 106 delete_all(AuthenticationConnection *ac) 107 { 108 int ret = -1; 109 110 if (ssh_remove_all_identities(ac, 1)) 111 ret = 0; 112 /* ignore error-code for ssh2 */ 113 ssh_remove_all_identities(ac, 2); 114 115 if (ret == 0) 116 fprintf(stderr, "All identities removed.\n"); 117 else 118 fprintf(stderr, "Failed to remove all identities.\n"); 119 120 return ret; 121 } 122 123 static int 124 add_file(AuthenticationConnection *ac, const char *filename) 125 { 126 struct stat st; 127 Key *private; 128 char *comment = NULL; 129 char msg[1024]; 130 int ret = -1; 131 132 if (stat(filename, &st) < 0) { 133 perror(filename); 134 return -1; 135 } 136 /* At first, try empty passphrase */ 137 private = key_load_private(filename, "", &comment); 138 if (comment == NULL) 139 comment = xstrdup(filename); 140 /* try last */ 141 if (private == NULL && pass != NULL) 142 private = key_load_private(filename, pass, NULL); 143 if (private == NULL) { 144 /* clear passphrase since it did not work */ 145 clear_pass(); 146 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", 147 comment); 148 for (;;) { 149 pass = read_passphrase(msg, RP_ALLOW_STDIN); 150 if (strcmp(pass, "") == 0) { 151 clear_pass(); 152 xfree(comment); 153 return -1; 154 } 155 private = key_load_private(filename, pass, &comment); 156 if (private != NULL) 157 break; 158 clear_pass(); 159 strlcpy(msg, "Bad passphrase, try again: ", sizeof msg); 160 } 161 } 162 163 if (ssh_add_identity_constrained(ac, private, comment, lifetime)) { 164 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 165 ret = 0; 166 if (lifetime != 0) 167 fprintf(stderr, 168 "Lifetime set to %d seconds\n", lifetime); 169 } else if (ssh_add_identity(ac, private, comment)) { 170 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 171 ret = 0; 172 } else { 173 fprintf(stderr, "Could not add identity: %s\n", filename); 174 } 175 176 xfree(comment); 177 key_free(private); 178 179 return ret; 180 } 181 182 static int 183 update_card(AuthenticationConnection *ac, int add, const char *id) 184 { 185 char *pin; 186 187 pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); 188 if (pin == NULL) 189 return -1; 190 191 if (ssh_update_card(ac, add, id, pin)) { 192 fprintf(stderr, "Card %s: %s\n", 193 add ? "added" : "removed", id); 194 return 0; 195 } else { 196 fprintf(stderr, "Could not %s card: %s\n", 197 add ? "add" : "remove", id); 198 return -1; 199 } 200 } 201 202 static int 203 list_identities(AuthenticationConnection *ac, int do_fp) 204 { 205 Key *key; 206 char *comment, *fp; 207 int had_identities = 0; 208 int version; 209 210 for (version = 1; version <= 2; version++) { 211 for (key = ssh_get_first_identity(ac, &comment, version); 212 key != NULL; 213 key = ssh_get_next_identity(ac, &comment, version)) { 214 had_identities = 1; 215 if (do_fp) { 216 fp = key_fingerprint(key, SSH_FP_MD5, 217 SSH_FP_HEX); 218 printf("%d %s %s (%s)\n", 219 key_size(key), fp, comment, key_type(key)); 220 xfree(fp); 221 } else { 222 if (!key_write(key, stdout)) 223 fprintf(stderr, "key_write failed"); 224 fprintf(stdout, " %s\n", comment); 225 } 226 key_free(key); 227 xfree(comment); 228 } 229 } 230 if (!had_identities) { 231 printf("The agent has no identities.\n"); 232 return -1; 233 } 234 return 0; 235 } 236 237 static int 238 lock_agent(AuthenticationConnection *ac, int lock) 239 { 240 char prompt[100], *p1, *p2; 241 int passok = 1, ret = -1; 242 243 strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); 244 p1 = read_passphrase(prompt, RP_ALLOW_STDIN); 245 if (lock) { 246 strlcpy(prompt, "Again: ", sizeof prompt); 247 p2 = read_passphrase(prompt, RP_ALLOW_STDIN); 248 if (strcmp(p1, p2) != 0) { 249 fprintf(stderr, "Passwords do not match.\n"); 250 passok = 0; 251 } 252 memset(p2, 0, strlen(p2)); 253 xfree(p2); 254 } 255 if (passok && ssh_lock_agent(ac, lock, p1)) { 256 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); 257 ret = 0; 258 } else 259 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); 260 memset(p1, 0, strlen(p1)); 261 xfree(p1); 262 return -1; 263 } 264 265 static int 266 do_file(AuthenticationConnection *ac, int deleting, char *file) 267 { 268 if (deleting) { 269 if (delete_file(ac, file) == -1) 270 return -1; 271 } else { 272 if (add_file(ac, file) == -1) 273 return -1; 274 } 275 return 0; 276 } 277 278 static void 279 usage(void) 280 { 281 fprintf(stderr, "Usage: %s [options]\n", __progname); 282 fprintf(stderr, "Options:\n"); 283 fprintf(stderr, " -l List fingerprints of all identities.\n"); 284 fprintf(stderr, " -L List public key parameters of all identities.\n"); 285 fprintf(stderr, " -d Delete identity.\n"); 286 fprintf(stderr, " -D Delete all identities.\n"); 287 fprintf(stderr, " -x Lock agent.\n"); 288 fprintf(stderr, " -x Unlock agent.\n"); 289 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); 290 #ifdef SMARTCARD 291 fprintf(stderr, " -s reader Add key in smartcard reader.\n"); 292 fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); 293 #endif 294 } 295 296 int 297 main(int argc, char **argv) 298 { 299 extern char *optarg; 300 extern int optind; 301 AuthenticationConnection *ac = NULL; 302 char *sc_reader_id = NULL; 303 int i, ch, deleting = 0, ret = 0; 304 305 SSLeay_add_all_algorithms(); 306 307 /* At first, get a connection to the authentication agent. */ 308 ac = ssh_get_authentication_connection(); 309 if (ac == NULL) { 310 fprintf(stderr, "Could not open a connection to your authentication agent.\n"); 311 exit(2); 312 } 313 while ((ch = getopt(argc, argv, "lLdDxXe:s:t:")) != -1) { 314 switch (ch) { 315 case 'l': 316 case 'L': 317 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) 318 ret = 1; 319 goto done; 320 break; 321 case 'x': 322 case 'X': 323 if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) 324 ret = 1; 325 goto done; 326 break; 327 case 'd': 328 deleting = 1; 329 break; 330 case 'D': 331 if (delete_all(ac) == -1) 332 ret = 1; 333 goto done; 334 break; 335 case 's': 336 sc_reader_id = optarg; 337 break; 338 case 'e': 339 deleting = 1; 340 sc_reader_id = optarg; 341 break; 342 case 't': 343 if ((lifetime = convtime(optarg)) == -1) { 344 fprintf(stderr, "Invalid lifetime\n"); 345 ret = 1; 346 goto done; 347 } 348 break; 349 default: 350 usage(); 351 ret = 1; 352 goto done; 353 } 354 } 355 argc -= optind; 356 argv += optind; 357 if (sc_reader_id != NULL) { 358 if (update_card(ac, !deleting, sc_reader_id) == -1) 359 ret = 1; 360 goto done; 361 } 362 if (argc == 0) { 363 char buf[MAXPATHLEN]; 364 struct passwd *pw; 365 struct stat st; 366 int count = 0; 367 368 if ((pw = getpwuid(getuid())) == NULL) { 369 fprintf(stderr, "No user found with uid %u\n", 370 (u_int)getuid()); 371 ret = 1; 372 goto done; 373 } 374 375 for(i = 0; default_files[i]; i++) { 376 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, 377 default_files[i]); 378 if (stat(buf, &st) < 0) 379 continue; 380 if (do_file(ac, deleting, buf) == -1) 381 ret = 1; 382 else 383 count++; 384 } 385 if (count == 0) 386 ret = 1; 387 } else { 388 for(i = 0; i < argc; i++) { 389 if (do_file(ac, deleting, argv[i]) == -1) 390 ret = 1; 391 } 392 } 393 clear_pass(); 394 395 done: 396 ssh_close_authentication_connection(ac); 397 return ret; 398 } 399