ssh-keygen.c revision 106121
1/* 2 * Author: Tatu Ylonen <ylo@cs.hut.fi> 3 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 4 * All rights reserved 5 * Identity and host key generation and maintenance. 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 14#include "includes.h" 15RCSID("$OpenBSD: ssh-keygen.c,v 1.101 2002/06/23 09:39:55 deraadt Exp $"); 16 17#include <openssl/evp.h> 18#include <openssl/pem.h> 19 20#include "xmalloc.h" 21#include "key.h" 22#include "rsa.h" 23#include "authfile.h" 24#include "uuencode.h" 25#include "buffer.h" 26#include "bufaux.h" 27#include "pathnames.h" 28#include "log.h" 29#include "readpass.h" 30 31#ifdef SMARTCARD 32#include "scard.h" 33#endif 34 35/* Number of bits in the RSA/DSA key. This value can be changed on the command line. */ 36int bits = 1024; 37 38/* 39 * Flag indicating that we just want to change the passphrase. This can be 40 * set on the command line. 41 */ 42int change_passphrase = 0; 43 44/* 45 * Flag indicating that we just want to change the comment. This can be set 46 * on the command line. 47 */ 48int change_comment = 0; 49 50int quiet = 0; 51 52/* Flag indicating that we just want to see the key fingerprint */ 53int print_fingerprint = 0; 54int print_bubblebabble = 0; 55 56/* The identity file name, given on the command line or entered by the user. */ 57char identity_file[1024]; 58int have_identity = 0; 59 60/* This is set to the passphrase if given on the command line. */ 61char *identity_passphrase = NULL; 62 63/* This is set to the new passphrase if given on the command line. */ 64char *identity_new_passphrase = NULL; 65 66/* This is set to the new comment if given on the command line. */ 67char *identity_comment = NULL; 68 69/* Dump public key file in format used by real and the original SSH 2 */ 70int convert_to_ssh2 = 0; 71int convert_from_ssh2 = 0; 72int print_public = 0; 73 74char *key_type_name = NULL; 75 76/* argv0 */ 77#ifdef HAVE___PROGNAME 78extern char *__progname; 79#else 80char *__progname; 81#endif 82 83char hostname[MAXHOSTNAMELEN]; 84 85static void 86ask_filename(struct passwd *pw, const char *prompt) 87{ 88 char buf[1024]; 89 char *name = NULL; 90 91 if (key_type_name == NULL) 92 name = _PATH_SSH_CLIENT_ID_RSA; 93 else 94 switch (key_type_from_name(key_type_name)) { 95 case KEY_RSA1: 96 name = _PATH_SSH_CLIENT_IDENTITY; 97 break; 98 case KEY_DSA: 99 name = _PATH_SSH_CLIENT_ID_DSA; 100 break; 101 case KEY_RSA: 102 name = _PATH_SSH_CLIENT_ID_RSA; 103 break; 104 default: 105 fprintf(stderr, "bad key type"); 106 exit(1); 107 break; 108 } 109 110 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 111 fprintf(stderr, "%s (%s): ", prompt, identity_file); 112 fflush(stderr); 113 if (fgets(buf, sizeof(buf), stdin) == NULL) 114 exit(1); 115 if (strchr(buf, '\n')) 116 *strchr(buf, '\n') = 0; 117 if (strcmp(buf, "") != 0) 118 strlcpy(identity_file, buf, sizeof(identity_file)); 119 have_identity = 1; 120} 121 122static Key * 123load_identity(char *filename) 124{ 125 char *pass; 126 Key *prv; 127 128 prv = key_load_private(filename, "", NULL); 129 if (prv == NULL) { 130 if (identity_passphrase) 131 pass = xstrdup(identity_passphrase); 132 else 133 pass = read_passphrase("Enter passphrase: ", 134 RP_ALLOW_STDIN); 135 prv = key_load_private(filename, pass, NULL); 136 memset(pass, 0, strlen(pass)); 137 xfree(pass); 138 } 139 return prv; 140} 141 142#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 143#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 144#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 145#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 146 147static void 148do_convert_to_ssh2(struct passwd *pw) 149{ 150 Key *k; 151 u_int len; 152 u_char *blob; 153 struct stat st; 154 155 if (!have_identity) 156 ask_filename(pw, "Enter file in which the key is"); 157 if (stat(identity_file, &st) < 0) { 158 perror(identity_file); 159 exit(1); 160 } 161 if ((k = key_load_public(identity_file, NULL)) == NULL) { 162 if ((k = load_identity(identity_file)) == NULL) { 163 fprintf(stderr, "load failed\n"); 164 exit(1); 165 } 166 } 167 if (key_to_blob(k, &blob, &len) <= 0) { 168 fprintf(stderr, "key_to_blob failed\n"); 169 exit(1); 170 } 171 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 172 fprintf(stdout, 173 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n", 174 key_size(k), key_type(k), 175 pw->pw_name, hostname); 176 dump_base64(stdout, blob, len); 177 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 178 key_free(k); 179 xfree(blob); 180 exit(0); 181} 182 183static void 184buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 185{ 186 int bits = buffer_get_int(b); 187 int bytes = (bits + 7) / 8; 188 189 if (buffer_len(b) < bytes) 190 fatal("buffer_get_bignum_bits: input buffer too small: " 191 "need %d have %d", bytes, buffer_len(b)); 192 BN_bin2bn(buffer_ptr(b), bytes, value); 193 buffer_consume(b, bytes); 194} 195 196static Key * 197do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 198{ 199 Buffer b; 200 Key *key = NULL; 201 char *type, *cipher; 202 u_char *sig, data[] = "abcde12345"; 203 int magic, rlen, ktype, i1, i2, i3, i4; 204 u_int slen; 205 u_long e; 206 207 buffer_init(&b); 208 buffer_append(&b, blob, blen); 209 210 magic = buffer_get_int(&b); 211 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 212 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 213 buffer_free(&b); 214 return NULL; 215 } 216 i1 = buffer_get_int(&b); 217 type = buffer_get_string(&b, NULL); 218 cipher = buffer_get_string(&b, NULL); 219 i2 = buffer_get_int(&b); 220 i3 = buffer_get_int(&b); 221 i4 = buffer_get_int(&b); 222 debug("ignore (%d %d %d %d)", i1,i2,i3,i4); 223 if (strcmp(cipher, "none") != 0) { 224 error("unsupported cipher %s", cipher); 225 xfree(cipher); 226 buffer_free(&b); 227 xfree(type); 228 return NULL; 229 } 230 xfree(cipher); 231 232 if (strstr(type, "dsa")) { 233 ktype = KEY_DSA; 234 } else if (strstr(type, "rsa")) { 235 ktype = KEY_RSA; 236 } else { 237 xfree(type); 238 return NULL; 239 } 240 key = key_new_private(ktype); 241 xfree(type); 242 243 switch (key->type) { 244 case KEY_DSA: 245 buffer_get_bignum_bits(&b, key->dsa->p); 246 buffer_get_bignum_bits(&b, key->dsa->g); 247 buffer_get_bignum_bits(&b, key->dsa->q); 248 buffer_get_bignum_bits(&b, key->dsa->pub_key); 249 buffer_get_bignum_bits(&b, key->dsa->priv_key); 250 break; 251 case KEY_RSA: 252 e = buffer_get_char(&b); 253 debug("e %lx", e); 254 if (e < 30) { 255 e <<= 8; 256 e += buffer_get_char(&b); 257 debug("e %lx", e); 258 e <<= 8; 259 e += buffer_get_char(&b); 260 debug("e %lx", e); 261 } 262 if (!BN_set_word(key->rsa->e, e)) { 263 buffer_free(&b); 264 key_free(key); 265 return NULL; 266 } 267 buffer_get_bignum_bits(&b, key->rsa->d); 268 buffer_get_bignum_bits(&b, key->rsa->n); 269 buffer_get_bignum_bits(&b, key->rsa->iqmp); 270 buffer_get_bignum_bits(&b, key->rsa->q); 271 buffer_get_bignum_bits(&b, key->rsa->p); 272 rsa_generate_additional_parameters(key->rsa); 273 break; 274 } 275 rlen = buffer_len(&b); 276 if (rlen != 0) 277 error("do_convert_private_ssh2_from_blob: " 278 "remaining bytes in key blob %d", rlen); 279 buffer_free(&b); 280 281 /* try the key */ 282 key_sign(key, &sig, &slen, data, sizeof(data)); 283 key_verify(key, sig, slen, data, sizeof(data)); 284 xfree(sig); 285 return key; 286} 287 288static void 289do_convert_from_ssh2(struct passwd *pw) 290{ 291 Key *k; 292 int blen; 293 u_int len; 294 char line[1024], *p; 295 u_char blob[8096]; 296 char encoded[8096]; 297 struct stat st; 298 int escaped = 0, private = 0, ok; 299 FILE *fp; 300 301 if (!have_identity) 302 ask_filename(pw, "Enter file in which the key is"); 303 if (stat(identity_file, &st) < 0) { 304 perror(identity_file); 305 exit(1); 306 } 307 fp = fopen(identity_file, "r"); 308 if (fp == NULL) { 309 perror(identity_file); 310 exit(1); 311 } 312 encoded[0] = '\0'; 313 while (fgets(line, sizeof(line), fp)) { 314 if (!(p = strchr(line, '\n'))) { 315 fprintf(stderr, "input line too long.\n"); 316 exit(1); 317 } 318 if (p > line && p[-1] == '\\') 319 escaped++; 320 if (strncmp(line, "----", 4) == 0 || 321 strstr(line, ": ") != NULL) { 322 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 323 private = 1; 324 if (strstr(line, " END ") != NULL) { 325 break; 326 } 327 /* fprintf(stderr, "ignore: %s", line); */ 328 continue; 329 } 330 if (escaped) { 331 escaped--; 332 /* fprintf(stderr, "escaped: %s", line); */ 333 continue; 334 } 335 *p = '\0'; 336 strlcat(encoded, line, sizeof(encoded)); 337 } 338 len = strlen(encoded); 339 if (((len % 4) == 3) && 340 (encoded[len-1] == '=') && 341 (encoded[len-2] == '=') && 342 (encoded[len-3] == '=')) 343 encoded[len-3] = '\0'; 344 blen = uudecode(encoded, blob, sizeof(blob)); 345 if (blen < 0) { 346 fprintf(stderr, "uudecode failed.\n"); 347 exit(1); 348 } 349 k = private ? 350 do_convert_private_ssh2_from_blob(blob, blen) : 351 key_from_blob(blob, blen); 352 if (k == NULL) { 353 fprintf(stderr, "decode blob failed.\n"); 354 exit(1); 355 } 356 ok = private ? 357 (k->type == KEY_DSA ? 358 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : 359 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : 360 key_write(k, stdout); 361 if (!ok) { 362 fprintf(stderr, "key write failed"); 363 exit(1); 364 } 365 key_free(k); 366 if (!private) 367 fprintf(stdout, "\n"); 368 fclose(fp); 369 exit(0); 370} 371 372static void 373do_print_public(struct passwd *pw) 374{ 375 Key *prv; 376 struct stat st; 377 378 if (!have_identity) 379 ask_filename(pw, "Enter file in which the key is"); 380 if (stat(identity_file, &st) < 0) { 381 perror(identity_file); 382 exit(1); 383 } 384 prv = load_identity(identity_file); 385 if (prv == NULL) { 386 fprintf(stderr, "load failed\n"); 387 exit(1); 388 } 389 if (!key_write(prv, stdout)) 390 fprintf(stderr, "key_write failed"); 391 key_free(prv); 392 fprintf(stdout, "\n"); 393 exit(0); 394} 395 396#ifdef SMARTCARD 397static void 398do_upload(struct passwd *pw, const char *sc_reader_id) 399{ 400 Key *prv = NULL; 401 struct stat st; 402 int ret; 403 404 if (!have_identity) 405 ask_filename(pw, "Enter file in which the key is"); 406 if (stat(identity_file, &st) < 0) { 407 perror(identity_file); 408 exit(1); 409 } 410 prv = load_identity(identity_file); 411 if (prv == NULL) { 412 error("load failed"); 413 exit(1); 414 } 415 ret = sc_put_key(prv, sc_reader_id); 416 key_free(prv); 417 if (ret < 0) 418 exit(1); 419 log("loading key done"); 420 exit(0); 421} 422 423static void 424do_download(struct passwd *pw, const char *sc_reader_id) 425{ 426 Key **keys = NULL; 427 int i; 428 429 keys = sc_get_keys(sc_reader_id, NULL); 430 if (keys == NULL) 431 fatal("cannot read public key from smartcard"); 432 for (i = 0; keys[i]; i++) { 433 key_write(keys[i], stdout); 434 key_free(keys[i]); 435 fprintf(stdout, "\n"); 436 } 437 xfree(keys); 438 exit(0); 439} 440#endif /* SMARTCARD */ 441 442static void 443do_fingerprint(struct passwd *pw) 444{ 445 FILE *f; 446 Key *public; 447 char *comment = NULL, *cp, *ep, line[16*1024], *fp; 448 int i, skip = 0, num = 1, invalid = 1; 449 enum fp_rep rep; 450 enum fp_type fptype; 451 struct stat st; 452 453 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 454 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 455 456 if (!have_identity) 457 ask_filename(pw, "Enter file in which the key is"); 458 if (stat(identity_file, &st) < 0) { 459 perror(identity_file); 460 exit(1); 461 } 462 public = key_load_public(identity_file, &comment); 463 if (public != NULL) { 464 fp = key_fingerprint(public, fptype, rep); 465 printf("%u %s %s\n", key_size(public), fp, comment); 466 key_free(public); 467 xfree(comment); 468 xfree(fp); 469 exit(0); 470 } 471 if (comment) 472 xfree(comment); 473 474 f = fopen(identity_file, "r"); 475 if (f != NULL) { 476 while (fgets(line, sizeof(line), f)) { 477 i = strlen(line) - 1; 478 if (line[i] != '\n') { 479 error("line %d too long: %.40s...", num, line); 480 skip = 1; 481 continue; 482 } 483 num++; 484 if (skip) { 485 skip = 0; 486 continue; 487 } 488 line[i] = '\0'; 489 490 /* Skip leading whitespace, empty and comment lines. */ 491 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 492 ; 493 if (!*cp || *cp == '\n' || *cp == '#') 494 continue ; 495 i = strtol(cp, &ep, 10); 496 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 497 int quoted = 0; 498 comment = cp; 499 for (; *cp && (quoted || (*cp != ' ' && 500 *cp != '\t')); cp++) { 501 if (*cp == '\\' && cp[1] == '"') 502 cp++; /* Skip both */ 503 else if (*cp == '"') 504 quoted = !quoted; 505 } 506 if (!*cp) 507 continue; 508 *cp++ = '\0'; 509 } 510 ep = cp; 511 public = key_new(KEY_RSA1); 512 if (key_read(public, &cp) != 1) { 513 cp = ep; 514 key_free(public); 515 public = key_new(KEY_UNSPEC); 516 if (key_read(public, &cp) != 1) { 517 key_free(public); 518 continue; 519 } 520 } 521 comment = *cp ? cp : comment; 522 fp = key_fingerprint(public, fptype, rep); 523 printf("%u %s %s\n", key_size(public), fp, 524 comment ? comment : "no comment"); 525 xfree(fp); 526 key_free(public); 527 invalid = 0; 528 } 529 fclose(f); 530 } 531 if (invalid) { 532 printf("%s is not a public key file.\n", identity_file); 533 exit(1); 534 } 535 exit(0); 536} 537 538/* 539 * Perform changing a passphrase. The argument is the passwd structure 540 * for the current user. 541 */ 542static void 543do_change_passphrase(struct passwd *pw) 544{ 545 char *comment; 546 char *old_passphrase, *passphrase1, *passphrase2; 547 struct stat st; 548 Key *private; 549 550 if (!have_identity) 551 ask_filename(pw, "Enter file in which the key is"); 552 if (stat(identity_file, &st) < 0) { 553 perror(identity_file); 554 exit(1); 555 } 556 /* Try to load the file with empty passphrase. */ 557 private = key_load_private(identity_file, "", &comment); 558 if (private == NULL) { 559 if (identity_passphrase) 560 old_passphrase = xstrdup(identity_passphrase); 561 else 562 old_passphrase = 563 read_passphrase("Enter old passphrase: ", 564 RP_ALLOW_STDIN); 565 private = key_load_private(identity_file, old_passphrase, 566 &comment); 567 memset(old_passphrase, 0, strlen(old_passphrase)); 568 xfree(old_passphrase); 569 if (private == NULL) { 570 printf("Bad passphrase.\n"); 571 exit(1); 572 } 573 } 574 printf("Key has comment '%s'\n", comment); 575 576 /* Ask the new passphrase (twice). */ 577 if (identity_new_passphrase) { 578 passphrase1 = xstrdup(identity_new_passphrase); 579 passphrase2 = NULL; 580 } else { 581 passphrase1 = 582 read_passphrase("Enter new passphrase (empty for no " 583 "passphrase): ", RP_ALLOW_STDIN); 584 passphrase2 = read_passphrase("Enter same passphrase again: ", 585 RP_ALLOW_STDIN); 586 587 /* Verify that they are the same. */ 588 if (strcmp(passphrase1, passphrase2) != 0) { 589 memset(passphrase1, 0, strlen(passphrase1)); 590 memset(passphrase2, 0, strlen(passphrase2)); 591 xfree(passphrase1); 592 xfree(passphrase2); 593 printf("Pass phrases do not match. Try again.\n"); 594 exit(1); 595 } 596 /* Destroy the other copy. */ 597 memset(passphrase2, 0, strlen(passphrase2)); 598 xfree(passphrase2); 599 } 600 601 /* Save the file using the new passphrase. */ 602 if (!key_save_private(private, identity_file, passphrase1, comment)) { 603 printf("Saving the key failed: %s.\n", identity_file); 604 memset(passphrase1, 0, strlen(passphrase1)); 605 xfree(passphrase1); 606 key_free(private); 607 xfree(comment); 608 exit(1); 609 } 610 /* Destroy the passphrase and the copy of the key in memory. */ 611 memset(passphrase1, 0, strlen(passphrase1)); 612 xfree(passphrase1); 613 key_free(private); /* Destroys contents */ 614 xfree(comment); 615 616 printf("Your identification has been saved with the new passphrase.\n"); 617 exit(0); 618} 619 620/* 621 * Change the comment of a private key file. 622 */ 623static void 624do_change_comment(struct passwd *pw) 625{ 626 char new_comment[1024], *comment, *passphrase; 627 Key *private; 628 Key *public; 629 struct stat st; 630 FILE *f; 631 int fd; 632 633 if (!have_identity) 634 ask_filename(pw, "Enter file in which the key is"); 635 if (stat(identity_file, &st) < 0) { 636 perror(identity_file); 637 exit(1); 638 } 639 private = key_load_private(identity_file, "", &comment); 640 if (private == NULL) { 641 if (identity_passphrase) 642 passphrase = xstrdup(identity_passphrase); 643 else if (identity_new_passphrase) 644 passphrase = xstrdup(identity_new_passphrase); 645 else 646 passphrase = read_passphrase("Enter passphrase: ", 647 RP_ALLOW_STDIN); 648 /* Try to load using the passphrase. */ 649 private = key_load_private(identity_file, passphrase, &comment); 650 if (private == NULL) { 651 memset(passphrase, 0, strlen(passphrase)); 652 xfree(passphrase); 653 printf("Bad passphrase.\n"); 654 exit(1); 655 } 656 } else { 657 passphrase = xstrdup(""); 658 } 659 if (private->type != KEY_RSA1) { 660 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 661 key_free(private); 662 exit(1); 663 } 664 printf("Key now has comment '%s'\n", comment); 665 666 if (identity_comment) { 667 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 668 } else { 669 printf("Enter new comment: "); 670 fflush(stdout); 671 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 672 memset(passphrase, 0, strlen(passphrase)); 673 key_free(private); 674 exit(1); 675 } 676 if (strchr(new_comment, '\n')) 677 *strchr(new_comment, '\n') = 0; 678 } 679 680 /* Save the file using the new passphrase. */ 681 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 682 printf("Saving the key failed: %s.\n", identity_file); 683 memset(passphrase, 0, strlen(passphrase)); 684 xfree(passphrase); 685 key_free(private); 686 xfree(comment); 687 exit(1); 688 } 689 memset(passphrase, 0, strlen(passphrase)); 690 xfree(passphrase); 691 public = key_from_private(private); 692 key_free(private); 693 694 strlcat(identity_file, ".pub", sizeof(identity_file)); 695 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 696 if (fd == -1) { 697 printf("Could not save your public key in %s\n", identity_file); 698 exit(1); 699 } 700 f = fdopen(fd, "w"); 701 if (f == NULL) { 702 printf("fdopen %s failed", identity_file); 703 exit(1); 704 } 705 if (!key_write(public, f)) 706 fprintf(stderr, "write key failed"); 707 key_free(public); 708 fprintf(f, " %s\n", new_comment); 709 fclose(f); 710 711 xfree(comment); 712 713 printf("The comment in your key file has been changed.\n"); 714 exit(0); 715} 716 717static void 718usage(void) 719{ 720 fprintf(stderr, "Usage: %s [options]\n", __progname); 721 fprintf(stderr, "Options:\n"); 722 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 723 fprintf(stderr, " -c Change comment in private and public key files.\n"); 724 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); 725 fprintf(stderr, " -f filename Filename of the key file.\n"); 726 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); 727 fprintf(stderr, " -l Show fingerprint of key file.\n"); 728 fprintf(stderr, " -p Change passphrase of private key file.\n"); 729 fprintf(stderr, " -q Quiet.\n"); 730 fprintf(stderr, " -y Read private key file and print public key.\n"); 731 fprintf(stderr, " -t type Specify type of key to create.\n"); 732 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 733 fprintf(stderr, " -C comment Provide new comment.\n"); 734 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 735 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 736#ifdef SMARTCARD 737 fprintf(stderr, " -D reader Download public key from smartcard.\n"); 738 fprintf(stderr, " -U reader Upload private key to smartcard.\n"); 739#endif /* SMARTCARD */ 740 741 exit(1); 742} 743 744/* 745 * Main program for key management. 746 */ 747int 748main(int ac, char **av) 749{ 750 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 751 char *reader_id = NULL; 752 Key *private, *public; 753 struct passwd *pw; 754 struct stat st; 755 int opt, type, fd, download = 0; 756 FILE *f; 757 758 extern int optind; 759 extern char *optarg; 760 761 __progname = get_progname(av[0]); 762 763 SSLeay_add_all_algorithms(); 764 init_rng(); 765 seed_rng(); 766 767 /* we need this for the home * directory. */ 768 pw = getpwuid(getuid()); 769 if (!pw) { 770 printf("You don't exist, go away!\n"); 771 exit(1); 772 } 773 if (gethostname(hostname, sizeof(hostname)) < 0) { 774 perror("gethostname"); 775 exit(1); 776 } 777 778 while ((opt = getopt(ac, av, "deiqpclBRxXyb:f:t:U:D:P:N:C:")) != -1) { 779 switch (opt) { 780 case 'b': 781 bits = atoi(optarg); 782 if (bits < 512 || bits > 32768) { 783 printf("Bits has bad value.\n"); 784 exit(1); 785 } 786 break; 787 case 'l': 788 print_fingerprint = 1; 789 break; 790 case 'B': 791 print_bubblebabble = 1; 792 break; 793 case 'p': 794 change_passphrase = 1; 795 break; 796 case 'c': 797 change_comment = 1; 798 break; 799 case 'f': 800 strlcpy(identity_file, optarg, sizeof(identity_file)); 801 have_identity = 1; 802 break; 803 case 'P': 804 identity_passphrase = optarg; 805 break; 806 case 'N': 807 identity_new_passphrase = optarg; 808 break; 809 case 'C': 810 identity_comment = optarg; 811 break; 812 case 'q': 813 quiet = 1; 814 break; 815 case 'R': 816 /* unused */ 817 exit(0); 818 break; 819 case 'e': 820 case 'x': 821 /* export key */ 822 convert_to_ssh2 = 1; 823 break; 824 case 'i': 825 case 'X': 826 /* import key */ 827 convert_from_ssh2 = 1; 828 break; 829 case 'y': 830 print_public = 1; 831 break; 832 case 'd': 833 key_type_name = "dsa"; 834 break; 835 case 't': 836 key_type_name = optarg; 837 break; 838 case 'D': 839 download = 1; 840 case 'U': 841 reader_id = optarg; 842 break; 843 case '?': 844 default: 845 usage(); 846 } 847 } 848 if (optind < ac) { 849 printf("Too many arguments.\n"); 850 usage(); 851 } 852 if (change_passphrase && change_comment) { 853 printf("Can only have one of -p and -c.\n"); 854 usage(); 855 } 856 if (print_fingerprint || print_bubblebabble) 857 do_fingerprint(pw); 858 if (change_passphrase) 859 do_change_passphrase(pw); 860 if (change_comment) 861 do_change_comment(pw); 862 if (convert_to_ssh2) 863 do_convert_to_ssh2(pw); 864 if (convert_from_ssh2) 865 do_convert_from_ssh2(pw); 866 if (print_public) 867 do_print_public(pw); 868 if (reader_id != NULL) { 869#ifdef SMARTCARD 870 if (download) 871 do_download(pw, reader_id); 872 else 873 do_upload(pw, reader_id); 874#else /* SMARTCARD */ 875 fatal("no support for smartcards."); 876#endif /* SMARTCARD */ 877 } 878 879 arc4random_stir(); 880 881 if (key_type_name == NULL) { 882 printf("You must specify a key type (-t).\n"); 883 usage(); 884 } 885 type = key_type_from_name(key_type_name); 886 if (type == KEY_UNSPEC) { 887 fprintf(stderr, "unknown key type %s\n", key_type_name); 888 exit(1); 889 } 890 if (!quiet) 891 printf("Generating public/private %s key pair.\n", key_type_name); 892 private = key_generate(type, bits); 893 if (private == NULL) { 894 fprintf(stderr, "key_generate failed"); 895 exit(1); 896 } 897 public = key_from_private(private); 898 899 if (!have_identity) 900 ask_filename(pw, "Enter file in which to save the key"); 901 902 /* Create ~/.ssh directory if it doesn\'t already exist. */ 903 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); 904 if (strstr(identity_file, dotsshdir) != NULL && 905 stat(dotsshdir, &st) < 0) { 906 if (mkdir(dotsshdir, 0700) < 0) 907 error("Could not create directory '%s'.", dotsshdir); 908 else if (!quiet) 909 printf("Created directory '%s'.\n", dotsshdir); 910 } 911 /* If the file already exists, ask the user to confirm. */ 912 if (stat(identity_file, &st) >= 0) { 913 char yesno[3]; 914 printf("%s already exists.\n", identity_file); 915 printf("Overwrite (y/n)? "); 916 fflush(stdout); 917 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 918 exit(1); 919 if (yesno[0] != 'y' && yesno[0] != 'Y') 920 exit(1); 921 } 922 /* Ask for a passphrase (twice). */ 923 if (identity_passphrase) 924 passphrase1 = xstrdup(identity_passphrase); 925 else if (identity_new_passphrase) 926 passphrase1 = xstrdup(identity_new_passphrase); 927 else { 928passphrase_again: 929 passphrase1 = 930 read_passphrase("Enter passphrase (empty for no " 931 "passphrase): ", RP_ALLOW_STDIN); 932 passphrase2 = read_passphrase("Enter same passphrase again: ", 933 RP_ALLOW_STDIN); 934 if (strcmp(passphrase1, passphrase2) != 0) { 935 /* 936 * The passphrases do not match. Clear them and 937 * retry. 938 */ 939 memset(passphrase1, 0, strlen(passphrase1)); 940 memset(passphrase2, 0, strlen(passphrase2)); 941 xfree(passphrase1); 942 xfree(passphrase2); 943 printf("Passphrases do not match. Try again.\n"); 944 goto passphrase_again; 945 } 946 /* Clear the other copy of the passphrase. */ 947 memset(passphrase2, 0, strlen(passphrase2)); 948 xfree(passphrase2); 949 } 950 951 if (identity_comment) { 952 strlcpy(comment, identity_comment, sizeof(comment)); 953 } else { 954 /* Create default commend field for the passphrase. */ 955 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 956 } 957 958 /* Save the key with the given passphrase and comment. */ 959 if (!key_save_private(private, identity_file, passphrase1, comment)) { 960 printf("Saving the key failed: %s.\n", identity_file); 961 memset(passphrase1, 0, strlen(passphrase1)); 962 xfree(passphrase1); 963 exit(1); 964 } 965 /* Clear the passphrase. */ 966 memset(passphrase1, 0, strlen(passphrase1)); 967 xfree(passphrase1); 968 969 /* Clear the private key and the random number generator. */ 970 key_free(private); 971 arc4random_stir(); 972 973 if (!quiet) 974 printf("Your identification has been saved in %s.\n", identity_file); 975 976 strlcat(identity_file, ".pub", sizeof(identity_file)); 977 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 978 if (fd == -1) { 979 printf("Could not save your public key in %s\n", identity_file); 980 exit(1); 981 } 982 f = fdopen(fd, "w"); 983 if (f == NULL) { 984 printf("fdopen %s failed", identity_file); 985 exit(1); 986 } 987 if (!key_write(public, f)) 988 fprintf(stderr, "write key failed"); 989 fprintf(f, " %s\n", comment); 990 fclose(f); 991 992 if (!quiet) { 993 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 994 printf("Your public key has been saved in %s.\n", 995 identity_file); 996 printf("The key fingerprint is:\n"); 997 printf("%s %s\n", fp, comment); 998 xfree(fp); 999 } 1000 1001 key_free(public); 1002 exit(0); 1003} 1004