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 1.69 2003/11/21 11:57:03 djm 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 /* argv0 */ 54 extern char *__progname; 55 56 /* Default files to add */ 57 static char *default_files[] = { 58 _PATH_SSH_CLIENT_ID_RSA, 59 _PATH_SSH_CLIENT_ID_DSA, 60 _PATH_SSH_CLIENT_IDENTITY, 61 NULL 62 }; 63 64 /* Default lifetime (0 == forever) */ 65 static int lifetime = 0; 66 67 /* User has to confirm key use */ 68 static int confirm = 0; 69 70 /* we keep a cache of one passphrases */ 71 static char *pass = NULL; 72 static void 73 clear_pass(void) 74 { 75 if (pass) { 76 memset(pass, 0, strlen(pass)); 77 xfree(pass); 78 pass = NULL; 79 } 80 } 81 82 static int 83 delete_file(AuthenticationConnection *ac, const char *filename) 84 { 85 Key *public; 86 char *comment = NULL; 87 int ret = -1; 88 89 public = key_load_public(filename, &comment); 90 if (public == NULL) { 91 printf("Bad key file %s\n", filename); 92 return -1; 93 } 94 if (ssh_remove_identity(ac, public)) { 95 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); 96 ret = 0; 97 } else 98 fprintf(stderr, "Could not remove identity: %s\n", filename); 99 100 key_free(public); 101 xfree(comment); 102 103 return ret; 104 } 105 106 /* Send a request to remove all identities. */ 107 static int 108 delete_all(AuthenticationConnection *ac) 109 { 110 int ret = -1; 111 112 if (ssh_remove_all_identities(ac, 1)) 113 ret = 0; 114 /* ignore error-code for ssh2 */ 115 ssh_remove_all_identities(ac, 2); 116 117 if (ret == 0) 118 fprintf(stderr, "All identities removed.\n"); 119 else 120 fprintf(stderr, "Failed to remove all identities.\n"); 121 122 return ret; 123 } 124 125 static int 126 add_file(AuthenticationConnection *ac, const char *filename) 127 { 128 struct stat st; 129 Key *private; 130 char *comment = NULL; 131 char msg[1024]; 132 int ret = -1; 133 134 if (stat(filename, &st) < 0) { 135 perror(filename); 136 return -1; 137 } 138 /* At first, try empty passphrase */ 139 private = key_load_private(filename, "", &comment); 140 if (comment == NULL) 141 comment = xstrdup(filename); 142 /* try last */ 143 if (private == NULL && pass != NULL) 144 private = key_load_private(filename, pass, NULL); 145 if (private == NULL) { 146 /* clear passphrase since it did not work */ 147 clear_pass(); 148 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", 149 comment); 150 for (;;) { 151 pass = read_passphrase(msg, RP_ALLOW_STDIN); 152 if (strcmp(pass, "") == 0) { 153 clear_pass(); 154 xfree(comment); 155 return -1; 156 } 157 private = key_load_private(filename, pass, &comment); 158 if (private != NULL) 159 break; 160 clear_pass(); 161 snprintf(msg, sizeof msg, 162 "Bad passphrase, try again for %.200s: ", comment); 163 } 164 } 165 166 if (ssh_add_identity_constrained(ac, private, comment, lifetime, 167 confirm)) { 168 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 169 ret = 0; 170 if (lifetime != 0) 171 fprintf(stderr, 172 "Lifetime set to %d seconds\n", lifetime); 173 if (confirm != 0) 174 fprintf(stderr, 175 "The user has to confirm each use of the key\n"); 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 int ret = -1; 194 195 pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); 196 if (pin == NULL) 197 return -1; 198 199 if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) { 200 fprintf(stderr, "Card %s: %s\n", 201 add ? "added" : "removed", id); 202 ret = 0; 203 } else { 204 fprintf(stderr, "Could not %s card: %s\n", 205 add ? "add" : "remove", id); 206 ret = -1; 207 } 208 xfree(pin); 209 return ret; 210 } 211 212 static int 213 list_identities(AuthenticationConnection *ac, int do_fp) 214 { 215 Key *key; 216 char *comment, *fp; 217 int had_identities = 0; 218 int version; 219 220 for (version = 1; version <= 2; version++) { 221 for (key = ssh_get_first_identity(ac, &comment, version); 222 key != NULL; 223 key = ssh_get_next_identity(ac, &comment, version)) { 224 had_identities = 1; 225 if (do_fp) { 226 fp = key_fingerprint(key, SSH_FP_MD5, 227 SSH_FP_HEX); 228 printf("%d %s %s (%s)\n", 229 key_size(key), fp, comment, key_type(key)); 230 xfree(fp); 231 } else { 232 if (!key_write(key, stdout)) 233 fprintf(stderr, "key_write failed"); 234 fprintf(stdout, " %s\n", comment); 235 } 236 key_free(key); 237 xfree(comment); 238 } 239 } 240 if (!had_identities) { 241 printf("The agent has no identities.\n"); 242 return -1; 243 } 244 return 0; 245 } 246 247 static int 248 lock_agent(AuthenticationConnection *ac, int lock) 249 { 250 char prompt[100], *p1, *p2; 251 int passok = 1, ret = -1; 252 253 strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); 254 p1 = read_passphrase(prompt, RP_ALLOW_STDIN); 255 if (lock) { 256 strlcpy(prompt, "Again: ", sizeof prompt); 257 p2 = read_passphrase(prompt, RP_ALLOW_STDIN); 258 if (strcmp(p1, p2) != 0) { 259 fprintf(stderr, "Passwords do not match.\n"); 260 passok = 0; 261 } 262 memset(p2, 0, strlen(p2)); 263 xfree(p2); 264 } 265 if (passok && ssh_lock_agent(ac, lock, p1)) { 266 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); 267 ret = 0; 268 } else 269 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); 270 memset(p1, 0, strlen(p1)); 271 xfree(p1); 272 return (ret); 273 } 274 275 static int 276 do_file(AuthenticationConnection *ac, int deleting, char *file) 277 { 278 if (deleting) { 279 if (delete_file(ac, file) == -1) 280 return -1; 281 } else { 282 if (add_file(ac, file) == -1) 283 return -1; 284 } 285 return 0; 286 } 287 288 static void 289 usage(void) 290 { 291 fprintf(stderr, "Usage: %s [options]\n", __progname); 292 fprintf(stderr, "Options:\n"); 293 fprintf(stderr, " -l List fingerprints of all identities.\n"); 294 fprintf(stderr, " -L List public key parameters of all identities.\n"); 295 fprintf(stderr, " -d Delete identity.\n"); 296 fprintf(stderr, " -D Delete all identities.\n"); 297 fprintf(stderr, " -x Lock agent.\n"); 298 fprintf(stderr, " -X Unlock agent.\n"); 299 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); 300 fprintf(stderr, " -c Require confirmation to sign using identities\n"); 301 #ifdef SMARTCARD 302 fprintf(stderr, " -s reader Add key in smartcard reader.\n"); 303 fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); 304 #endif 305 } 306 307 int 308 main(int argc, char **argv) 309 { 310 extern char *optarg; 311 extern int optind; 312 AuthenticationConnection *ac = NULL; 313 char *sc_reader_id = NULL; 314 int i, ch, deleting = 0, ret = 0; 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, "lLcdDxXe: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 'c': 339 confirm = 1; 340 break; 341 case 'd': 342 deleting = 1; 343 break; 344 case 'D': 345 if (delete_all(ac) == -1) 346 ret = 1; 347 goto done; 348 break; 349 case 's': 350 sc_reader_id = optarg; 351 break; 352 case 'e': 353 deleting = 1; 354 sc_reader_id = optarg; 355 break; 356 case 't': 357 if ((lifetime = convtime(optarg)) == -1) { 358 fprintf(stderr, "Invalid lifetime\n"); 359 ret = 1; 360 goto done; 361 } 362 break; 363 default: 364 usage(); 365 ret = 1; 366 goto done; 367 } 368 } 369 argc -= optind; 370 argv += optind; 371 if (sc_reader_id != NULL) { 372 if (update_card(ac, !deleting, sc_reader_id) == -1) 373 ret = 1; 374 goto done; 375 } 376 if (argc == 0) { 377 char buf[MAXPATHLEN]; 378 struct passwd *pw; 379 struct stat st; 380 int count = 0; 381 382 if ((pw = getpwuid(getuid())) == NULL) { 383 fprintf(stderr, "No user found with uid %u\n", 384 (u_int)getuid()); 385 ret = 1; 386 goto done; 387 } 388 389 for(i = 0; default_files[i]; i++) { 390 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, 391 default_files[i]); 392 if (stat(buf, &st) < 0) 393 continue; 394 if (do_file(ac, deleting, buf) == -1) 395 ret = 1; 396 else 397 count++; 398 } 399 if (count == 0) 400 ret = 1; 401 } else { 402 for(i = 0; i < argc; i++) { 403 if (do_file(ac, deleting, argv[i]) == -1) 404 ret = 1; 405 } 406 } 407 clear_pass(); 408 409 done: 410 ssh_close_authentication_connection(ac); 411 return ret; 412 } 413