ssh-add.c revision 113911
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" 38RCSID("$OpenBSD: ssh-add.c,v 1.66 2003/03/05 22:33:43 markus Exp $"); 39RCSID("$FreeBSD: head/crypto/openssh/ssh-add.c 113911 2003-04-23 17:13:13Z des $"); 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 55extern char *__progname; 56#else 57char *__progname; 58#endif 59 60/* argv0 */ 61extern char *__progname; 62 63/* Default files to add */ 64static 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) */ 72static int lifetime = 0; 73 74/* User has to confirm key use */ 75static int confirm = 0; 76 77/* we keep a cache of one passphrases */ 78static char *pass = NULL; 79static void 80clear_pass(void) 81{ 82 if (pass) { 83 memset(pass, 0, strlen(pass)); 84 xfree(pass); 85 pass = NULL; 86 } 87} 88 89static int 90delete_file(AuthenticationConnection *ac, const char *filename) 91{ 92 Key *public; 93 char *comment = NULL; 94 int ret = -1; 95 96 public = key_load_public(filename, &comment); 97 if (public == NULL) { 98 printf("Bad key file %s\n", filename); 99 return -1; 100 } 101 if (ssh_remove_identity(ac, public)) { 102 fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); 103 ret = 0; 104 } else 105 fprintf(stderr, "Could not remove identity: %s\n", filename); 106 107 key_free(public); 108 xfree(comment); 109 110 return ret; 111} 112 113/* Send a request to remove all identities. */ 114static int 115delete_all(AuthenticationConnection *ac) 116{ 117 int ret = -1; 118 119 if (ssh_remove_all_identities(ac, 1)) 120 ret = 0; 121 /* ignore error-code for ssh2 */ 122 ssh_remove_all_identities(ac, 2); 123 124 if (ret == 0) 125 fprintf(stderr, "All identities removed.\n"); 126 else 127 fprintf(stderr, "Failed to remove all identities.\n"); 128 129 return ret; 130} 131 132static int 133add_file(AuthenticationConnection *ac, const char *filename) 134{ 135 struct stat st; 136 Key *private; 137 char *comment = NULL; 138 char msg[1024]; 139 int ret = -1; 140 141 if (stat(filename, &st) < 0) { 142 perror(filename); 143 return -1; 144 } 145 /* At first, try empty passphrase */ 146 private = key_load_private(filename, "", &comment); 147 if (comment == NULL) 148 comment = xstrdup(filename); 149 /* try last */ 150 if (private == NULL && pass != NULL) 151 private = key_load_private(filename, pass, NULL); 152 if (private == NULL) { 153 /* clear passphrase since it did not work */ 154 clear_pass(); 155 snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", 156 comment); 157 for (;;) { 158 pass = read_passphrase(msg, RP_ALLOW_STDIN); 159 if (strcmp(pass, "") == 0) { 160 clear_pass(); 161 xfree(comment); 162 return -1; 163 } 164 private = key_load_private(filename, pass, &comment); 165 if (private != NULL) 166 break; 167 clear_pass(); 168 strlcpy(msg, "Bad passphrase, try again: ", sizeof msg); 169 } 170 } 171 172 if (ssh_add_identity_constrained(ac, private, comment, lifetime, 173 confirm)) { 174 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 175 ret = 0; 176 if (lifetime != 0) 177 fprintf(stderr, 178 "Lifetime set to %d seconds\n", lifetime); 179 if (confirm != 0) 180 fprintf(stderr, 181 "The user has to confirm each use of the key\n"); 182 } else if (ssh_add_identity(ac, private, comment)) { 183 fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); 184 ret = 0; 185 } else { 186 fprintf(stderr, "Could not add identity: %s\n", filename); 187 } 188 189 xfree(comment); 190 key_free(private); 191 192 return ret; 193} 194 195static int 196update_card(AuthenticationConnection *ac, int add, const char *id) 197{ 198 char *pin; 199 int ret = -1; 200 201 pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); 202 if (pin == NULL) 203 return -1; 204 205 if (ssh_update_card(ac, add, id, pin)) { 206 fprintf(stderr, "Card %s: %s\n", 207 add ? "added" : "removed", id); 208 ret = 0; 209 } else { 210 fprintf(stderr, "Could not %s card: %s\n", 211 add ? "add" : "remove", id); 212 ret = -1; 213 } 214 xfree(pin); 215 return ret; 216} 217 218static int 219list_identities(AuthenticationConnection *ac, int do_fp) 220{ 221 Key *key; 222 char *comment, *fp; 223 int had_identities = 0; 224 int version; 225 226 for (version = 1; version <= 2; version++) { 227 for (key = ssh_get_first_identity(ac, &comment, version); 228 key != NULL; 229 key = ssh_get_next_identity(ac, &comment, version)) { 230 had_identities = 1; 231 if (do_fp) { 232 fp = key_fingerprint(key, SSH_FP_MD5, 233 SSH_FP_HEX); 234 printf("%d %s %s (%s)\n", 235 key_size(key), fp, comment, key_type(key)); 236 xfree(fp); 237 } else { 238 if (!key_write(key, stdout)) 239 fprintf(stderr, "key_write failed"); 240 fprintf(stdout, " %s\n", comment); 241 } 242 key_free(key); 243 xfree(comment); 244 } 245 } 246 if (!had_identities) { 247 printf("The agent has no identities.\n"); 248 return -1; 249 } 250 return 0; 251} 252 253static int 254lock_agent(AuthenticationConnection *ac, int lock) 255{ 256 char prompt[100], *p1, *p2; 257 int passok = 1, ret = -1; 258 259 strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); 260 p1 = read_passphrase(prompt, RP_ALLOW_STDIN); 261 if (lock) { 262 strlcpy(prompt, "Again: ", sizeof prompt); 263 p2 = read_passphrase(prompt, RP_ALLOW_STDIN); 264 if (strcmp(p1, p2) != 0) { 265 fprintf(stderr, "Passwords do not match.\n"); 266 passok = 0; 267 } 268 memset(p2, 0, strlen(p2)); 269 xfree(p2); 270 } 271 if (passok && ssh_lock_agent(ac, lock, p1)) { 272 fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); 273 ret = 0; 274 } else 275 fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); 276 memset(p1, 0, strlen(p1)); 277 xfree(p1); 278 return (ret); 279} 280 281static int 282do_file(AuthenticationConnection *ac, int deleting, char *file) 283{ 284 if (deleting) { 285 if (delete_file(ac, file) == -1) 286 return -1; 287 } else { 288 if (add_file(ac, file) == -1) 289 return -1; 290 } 291 return 0; 292} 293 294static void 295usage(void) 296{ 297 fprintf(stderr, "Usage: %s [options]\n", __progname); 298 fprintf(stderr, "Options:\n"); 299 fprintf(stderr, " -l List fingerprints of all identities.\n"); 300 fprintf(stderr, " -L List public key parameters of all identities.\n"); 301 fprintf(stderr, " -d Delete identity.\n"); 302 fprintf(stderr, " -D Delete all identities.\n"); 303 fprintf(stderr, " -x Lock agent.\n"); 304 fprintf(stderr, " -X Unlock agent.\n"); 305 fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); 306 fprintf(stderr, " -c Require confirmation to sign using identities\n"); 307#ifdef SMARTCARD 308 fprintf(stderr, " -s reader Add key in smartcard reader.\n"); 309 fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); 310#endif 311} 312 313int 314main(int argc, char **argv) 315{ 316 extern char *optarg; 317 extern int optind; 318 AuthenticationConnection *ac = NULL; 319 char *sc_reader_id = NULL; 320 int i, ch, deleting = 0, ret = 0; 321 322 __progname = get_progname(argv[0]); 323 init_rng(); 324 seed_rng(); 325 326 SSLeay_add_all_algorithms(); 327 328 /* At first, get a connection to the authentication agent. */ 329 ac = ssh_get_authentication_connection(); 330 if (ac == NULL) { 331 fprintf(stderr, "Could not open a connection to your authentication agent.\n"); 332 exit(2); 333 } 334 while ((ch = getopt(argc, argv, "lLcdDxXe:s:t:")) != -1) { 335 switch (ch) { 336 case 'l': 337 case 'L': 338 if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) 339 ret = 1; 340 goto done; 341 break; 342 case 'x': 343 case 'X': 344 if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) 345 ret = 1; 346 goto done; 347 break; 348 case 'c': 349 confirm = 1; 350 break; 351 case 'd': 352 deleting = 1; 353 break; 354 case 'D': 355 if (delete_all(ac) == -1) 356 ret = 1; 357 goto done; 358 break; 359 case 's': 360 sc_reader_id = optarg; 361 break; 362 case 'e': 363 deleting = 1; 364 sc_reader_id = optarg; 365 break; 366 case 't': 367 if ((lifetime = convtime(optarg)) == -1) { 368 fprintf(stderr, "Invalid lifetime\n"); 369 ret = 1; 370 goto done; 371 } 372 break; 373 default: 374 usage(); 375 ret = 1; 376 goto done; 377 } 378 } 379 argc -= optind; 380 argv += optind; 381 if (sc_reader_id != NULL) { 382 if (update_card(ac, !deleting, sc_reader_id) == -1) 383 ret = 1; 384 goto done; 385 } 386 if (argc == 0) { 387 char buf[MAXPATHLEN]; 388 struct passwd *pw; 389 struct stat st; 390 int count = 0; 391 392 if ((pw = getpwuid(getuid())) == NULL) { 393 fprintf(stderr, "No user found with uid %u\n", 394 (u_int)getuid()); 395 ret = 1; 396 goto done; 397 } 398 399 for(i = 0; default_files[i]; i++) { 400 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, 401 default_files[i]); 402 if (stat(buf, &st) < 0) 403 continue; 404 if (do_file(ac, deleting, buf) == -1) 405 ret = 1; 406 else 407 count++; 408 } 409 if (count == 0) 410 ret = 1; 411 } else { 412 for(i = 0; i < argc; i++) { 413 if (do_file(ac, deleting, argv[i]) == -1) 414 ret = 1; 415 } 416 } 417 clear_pass(); 418 419done: 420 ssh_close_authentication_connection(ac); 421 return ret; 422} 423