ssh-keygen.c revision 113908
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 1.102 2002/11/26 00:45:03 wcobb 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 if (fgets(buf, sizeof(buf), stdin) == NULL) 113 exit(1); 114 if (strchr(buf, '\n')) 115 *strchr(buf, '\n') = 0; 116 if (strcmp(buf, "") != 0) 117 strlcpy(identity_file, buf, sizeof(identity_file)); 118 have_identity = 1; 119} 120 121static Key * 122load_identity(char *filename) 123{ 124 char *pass; 125 Key *prv; 126 127 prv = key_load_private(filename, "", NULL); 128 if (prv == NULL) { 129 if (identity_passphrase) 130 pass = xstrdup(identity_passphrase); 131 else 132 pass = read_passphrase("Enter passphrase: ", 133 RP_ALLOW_STDIN); 134 prv = key_load_private(filename, pass, NULL); 135 memset(pass, 0, strlen(pass)); 136 xfree(pass); 137 } 138 return prv; 139} 140 141#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 142#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 143#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 144#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 145 146static void 147do_convert_to_ssh2(struct passwd *pw) 148{ 149 Key *k; 150 u_int len; 151 u_char *blob; 152 struct stat st; 153 154 if (!have_identity) 155 ask_filename(pw, "Enter file in which the key is"); 156 if (stat(identity_file, &st) < 0) { 157 perror(identity_file); 158 exit(1); 159 } 160 if ((k = key_load_public(identity_file, NULL)) == NULL) { 161 if ((k = load_identity(identity_file)) == NULL) { 162 fprintf(stderr, "load failed\n"); 163 exit(1); 164 } 165 } 166 if (key_to_blob(k, &blob, &len) <= 0) { 167 fprintf(stderr, "key_to_blob failed\n"); 168 exit(1); 169 } 170 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 171 fprintf(stdout, 172 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n", 173 key_size(k), key_type(k), 174 pw->pw_name, hostname); 175 dump_base64(stdout, blob, len); 176 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 177 key_free(k); 178 xfree(blob); 179 exit(0); 180} 181 182static void 183buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 184{ 185 int bits = buffer_get_int(b); 186 int bytes = (bits + 7) / 8; 187 188 if (buffer_len(b) < bytes) 189 fatal("buffer_get_bignum_bits: input buffer too small: " 190 "need %d have %d", bytes, buffer_len(b)); 191 BN_bin2bn(buffer_ptr(b), bytes, value); 192 buffer_consume(b, bytes); 193} 194 195static Key * 196do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 197{ 198 Buffer b; 199 Key *key = NULL; 200 char *type, *cipher; 201 u_char *sig, data[] = "abcde12345"; 202 int magic, rlen, ktype, i1, i2, i3, i4; 203 u_int slen; 204 u_long e; 205 206 buffer_init(&b); 207 buffer_append(&b, blob, blen); 208 209 magic = buffer_get_int(&b); 210 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 211 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 212 buffer_free(&b); 213 return NULL; 214 } 215 i1 = buffer_get_int(&b); 216 type = buffer_get_string(&b, NULL); 217 cipher = buffer_get_string(&b, NULL); 218 i2 = buffer_get_int(&b); 219 i3 = buffer_get_int(&b); 220 i4 = buffer_get_int(&b); 221 debug("ignore (%d %d %d %d)", i1,i2,i3,i4); 222 if (strcmp(cipher, "none") != 0) { 223 error("unsupported cipher %s", cipher); 224 xfree(cipher); 225 buffer_free(&b); 226 xfree(type); 227 return NULL; 228 } 229 xfree(cipher); 230 231 if (strstr(type, "dsa")) { 232 ktype = KEY_DSA; 233 } else if (strstr(type, "rsa")) { 234 ktype = KEY_RSA; 235 } else { 236 xfree(type); 237 return NULL; 238 } 239 key = key_new_private(ktype); 240 xfree(type); 241 242 switch (key->type) { 243 case KEY_DSA: 244 buffer_get_bignum_bits(&b, key->dsa->p); 245 buffer_get_bignum_bits(&b, key->dsa->g); 246 buffer_get_bignum_bits(&b, key->dsa->q); 247 buffer_get_bignum_bits(&b, key->dsa->pub_key); 248 buffer_get_bignum_bits(&b, key->dsa->priv_key); 249 break; 250 case KEY_RSA: 251 e = buffer_get_char(&b); 252 debug("e %lx", e); 253 if (e < 30) { 254 e <<= 8; 255 e += buffer_get_char(&b); 256 debug("e %lx", e); 257 e <<= 8; 258 e += buffer_get_char(&b); 259 debug("e %lx", e); 260 } 261 if (!BN_set_word(key->rsa->e, e)) { 262 buffer_free(&b); 263 key_free(key); 264 return NULL; 265 } 266 buffer_get_bignum_bits(&b, key->rsa->d); 267 buffer_get_bignum_bits(&b, key->rsa->n); 268 buffer_get_bignum_bits(&b, key->rsa->iqmp); 269 buffer_get_bignum_bits(&b, key->rsa->q); 270 buffer_get_bignum_bits(&b, key->rsa->p); 271 rsa_generate_additional_parameters(key->rsa); 272 break; 273 } 274 rlen = buffer_len(&b); 275 if (rlen != 0) 276 error("do_convert_private_ssh2_from_blob: " 277 "remaining bytes in key blob %d", rlen); 278 buffer_free(&b); 279 280 /* try the key */ 281 key_sign(key, &sig, &slen, data, sizeof(data)); 282 key_verify(key, sig, slen, data, sizeof(data)); 283 xfree(sig); 284 return key; 285} 286 287static void 288do_convert_from_ssh2(struct passwd *pw) 289{ 290 Key *k; 291 int blen; 292 u_int len; 293 char line[1024], *p; 294 u_char blob[8096]; 295 char encoded[8096]; 296 struct stat st; 297 int escaped = 0, private = 0, ok; 298 FILE *fp; 299 300 if (!have_identity) 301 ask_filename(pw, "Enter file in which the key is"); 302 if (stat(identity_file, &st) < 0) { 303 perror(identity_file); 304 exit(1); 305 } 306 fp = fopen(identity_file, "r"); 307 if (fp == NULL) { 308 perror(identity_file); 309 exit(1); 310 } 311 encoded[0] = '\0'; 312 while (fgets(line, sizeof(line), fp)) { 313 if (!(p = strchr(line, '\n'))) { 314 fprintf(stderr, "input line too long.\n"); 315 exit(1); 316 } 317 if (p > line && p[-1] == '\\') 318 escaped++; 319 if (strncmp(line, "----", 4) == 0 || 320 strstr(line, ": ") != NULL) { 321 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 322 private = 1; 323 if (strstr(line, " END ") != NULL) { 324 break; 325 } 326 /* fprintf(stderr, "ignore: %s", line); */ 327 continue; 328 } 329 if (escaped) { 330 escaped--; 331 /* fprintf(stderr, "escaped: %s", line); */ 332 continue; 333 } 334 *p = '\0'; 335 strlcat(encoded, line, sizeof(encoded)); 336 } 337 len = strlen(encoded); 338 if (((len % 4) == 3) && 339 (encoded[len-1] == '=') && 340 (encoded[len-2] == '=') && 341 (encoded[len-3] == '=')) 342 encoded[len-3] = '\0'; 343 blen = uudecode(encoded, blob, sizeof(blob)); 344 if (blen < 0) { 345 fprintf(stderr, "uudecode failed.\n"); 346 exit(1); 347 } 348 k = private ? 349 do_convert_private_ssh2_from_blob(blob, blen) : 350 key_from_blob(blob, blen); 351 if (k == NULL) { 352 fprintf(stderr, "decode blob failed.\n"); 353 exit(1); 354 } 355 ok = private ? 356 (k->type == KEY_DSA ? 357 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : 358 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : 359 key_write(k, stdout); 360 if (!ok) { 361 fprintf(stderr, "key write failed"); 362 exit(1); 363 } 364 key_free(k); 365 if (!private) 366 fprintf(stdout, "\n"); 367 fclose(fp); 368 exit(0); 369} 370 371static void 372do_print_public(struct passwd *pw) 373{ 374 Key *prv; 375 struct stat st; 376 377 if (!have_identity) 378 ask_filename(pw, "Enter file in which the key is"); 379 if (stat(identity_file, &st) < 0) { 380 perror(identity_file); 381 exit(1); 382 } 383 prv = load_identity(identity_file); 384 if (prv == NULL) { 385 fprintf(stderr, "load failed\n"); 386 exit(1); 387 } 388 if (!key_write(prv, stdout)) 389 fprintf(stderr, "key_write failed"); 390 key_free(prv); 391 fprintf(stdout, "\n"); 392 exit(0); 393} 394 395#ifdef SMARTCARD 396static void 397do_upload(struct passwd *pw, const char *sc_reader_id) 398{ 399 Key *prv = NULL; 400 struct stat st; 401 int ret; 402 403 if (!have_identity) 404 ask_filename(pw, "Enter file in which the key is"); 405 if (stat(identity_file, &st) < 0) { 406 perror(identity_file); 407 exit(1); 408 } 409 prv = load_identity(identity_file); 410 if (prv == NULL) { 411 error("load failed"); 412 exit(1); 413 } 414 ret = sc_put_key(prv, sc_reader_id); 415 key_free(prv); 416 if (ret < 0) 417 exit(1); 418 log("loading key done"); 419 exit(0); 420} 421 422static void 423do_download(struct passwd *pw, const char *sc_reader_id) 424{ 425 Key **keys = NULL; 426 int i; 427 428 keys = sc_get_keys(sc_reader_id, NULL); 429 if (keys == NULL) 430 fatal("cannot read public key from smartcard"); 431 for (i = 0; keys[i]; i++) { 432 key_write(keys[i], stdout); 433 key_free(keys[i]); 434 fprintf(stdout, "\n"); 435 } 436 xfree(keys); 437 exit(0); 438} 439#endif /* SMARTCARD */ 440 441static void 442do_fingerprint(struct passwd *pw) 443{ 444 FILE *f; 445 Key *public; 446 char *comment = NULL, *cp, *ep, line[16*1024], *fp; 447 int i, skip = 0, num = 1, invalid = 1; 448 enum fp_rep rep; 449 enum fp_type fptype; 450 struct stat st; 451 452 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 453 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 454 455 if (!have_identity) 456 ask_filename(pw, "Enter file in which the key is"); 457 if (stat(identity_file, &st) < 0) { 458 perror(identity_file); 459 exit(1); 460 } 461 public = key_load_public(identity_file, &comment); 462 if (public != NULL) { 463 fp = key_fingerprint(public, fptype, rep); 464 printf("%u %s %s\n", key_size(public), fp, comment); 465 key_free(public); 466 xfree(comment); 467 xfree(fp); 468 exit(0); 469 } 470 if (comment) 471 xfree(comment); 472 473 f = fopen(identity_file, "r"); 474 if (f != NULL) { 475 while (fgets(line, sizeof(line), f)) { 476 i = strlen(line) - 1; 477 if (line[i] != '\n') { 478 error("line %d too long: %.40s...", num, line); 479 skip = 1; 480 continue; 481 } 482 num++; 483 if (skip) { 484 skip = 0; 485 continue; 486 } 487 line[i] = '\0'; 488 489 /* Skip leading whitespace, empty and comment lines. */ 490 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 491 ; 492 if (!*cp || *cp == '\n' || *cp == '#') 493 continue ; 494 i = strtol(cp, &ep, 10); 495 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 496 int quoted = 0; 497 comment = cp; 498 for (; *cp && (quoted || (*cp != ' ' && 499 *cp != '\t')); cp++) { 500 if (*cp == '\\' && cp[1] == '"') 501 cp++; /* Skip both */ 502 else if (*cp == '"') 503 quoted = !quoted; 504 } 505 if (!*cp) 506 continue; 507 *cp++ = '\0'; 508 } 509 ep = cp; 510 public = key_new(KEY_RSA1); 511 if (key_read(public, &cp) != 1) { 512 cp = ep; 513 key_free(public); 514 public = key_new(KEY_UNSPEC); 515 if (key_read(public, &cp) != 1) { 516 key_free(public); 517 continue; 518 } 519 } 520 comment = *cp ? cp : comment; 521 fp = key_fingerprint(public, fptype, rep); 522 printf("%u %s %s\n", key_size(public), fp, 523 comment ? comment : "no comment"); 524 xfree(fp); 525 key_free(public); 526 invalid = 0; 527 } 528 fclose(f); 529 } 530 if (invalid) { 531 printf("%s is not a public key file.\n", identity_file); 532 exit(1); 533 } 534 exit(0); 535} 536 537/* 538 * Perform changing a passphrase. The argument is the passwd structure 539 * for the current user. 540 */ 541static void 542do_change_passphrase(struct passwd *pw) 543{ 544 char *comment; 545 char *old_passphrase, *passphrase1, *passphrase2; 546 struct stat st; 547 Key *private; 548 549 if (!have_identity) 550 ask_filename(pw, "Enter file in which the key is"); 551 if (stat(identity_file, &st) < 0) { 552 perror(identity_file); 553 exit(1); 554 } 555 /* Try to load the file with empty passphrase. */ 556 private = key_load_private(identity_file, "", &comment); 557 if (private == NULL) { 558 if (identity_passphrase) 559 old_passphrase = xstrdup(identity_passphrase); 560 else 561 old_passphrase = 562 read_passphrase("Enter old passphrase: ", 563 RP_ALLOW_STDIN); 564 private = key_load_private(identity_file, old_passphrase, 565 &comment); 566 memset(old_passphrase, 0, strlen(old_passphrase)); 567 xfree(old_passphrase); 568 if (private == NULL) { 569 printf("Bad passphrase.\n"); 570 exit(1); 571 } 572 } 573 printf("Key has comment '%s'\n", comment); 574 575 /* Ask the new passphrase (twice). */ 576 if (identity_new_passphrase) { 577 passphrase1 = xstrdup(identity_new_passphrase); 578 passphrase2 = NULL; 579 } else { 580 passphrase1 = 581 read_passphrase("Enter new passphrase (empty for no " 582 "passphrase): ", RP_ALLOW_STDIN); 583 passphrase2 = read_passphrase("Enter same passphrase again: ", 584 RP_ALLOW_STDIN); 585 586 /* Verify that they are the same. */ 587 if (strcmp(passphrase1, passphrase2) != 0) { 588 memset(passphrase1, 0, strlen(passphrase1)); 589 memset(passphrase2, 0, strlen(passphrase2)); 590 xfree(passphrase1); 591 xfree(passphrase2); 592 printf("Pass phrases do not match. Try again.\n"); 593 exit(1); 594 } 595 /* Destroy the other copy. */ 596 memset(passphrase2, 0, strlen(passphrase2)); 597 xfree(passphrase2); 598 } 599 600 /* Save the file using the new passphrase. */ 601 if (!key_save_private(private, identity_file, passphrase1, comment)) { 602 printf("Saving the key failed: %s.\n", identity_file); 603 memset(passphrase1, 0, strlen(passphrase1)); 604 xfree(passphrase1); 605 key_free(private); 606 xfree(comment); 607 exit(1); 608 } 609 /* Destroy the passphrase and the copy of the key in memory. */ 610 memset(passphrase1, 0, strlen(passphrase1)); 611 xfree(passphrase1); 612 key_free(private); /* Destroys contents */ 613 xfree(comment); 614 615 printf("Your identification has been saved with the new passphrase.\n"); 616 exit(0); 617} 618 619/* 620 * Change the comment of a private key file. 621 */ 622static void 623do_change_comment(struct passwd *pw) 624{ 625 char new_comment[1024], *comment, *passphrase; 626 Key *private; 627 Key *public; 628 struct stat st; 629 FILE *f; 630 int fd; 631 632 if (!have_identity) 633 ask_filename(pw, "Enter file in which the key is"); 634 if (stat(identity_file, &st) < 0) { 635 perror(identity_file); 636 exit(1); 637 } 638 private = key_load_private(identity_file, "", &comment); 639 if (private == NULL) { 640 if (identity_passphrase) 641 passphrase = xstrdup(identity_passphrase); 642 else if (identity_new_passphrase) 643 passphrase = xstrdup(identity_new_passphrase); 644 else 645 passphrase = read_passphrase("Enter passphrase: ", 646 RP_ALLOW_STDIN); 647 /* Try to load using the passphrase. */ 648 private = key_load_private(identity_file, passphrase, &comment); 649 if (private == NULL) { 650 memset(passphrase, 0, strlen(passphrase)); 651 xfree(passphrase); 652 printf("Bad passphrase.\n"); 653 exit(1); 654 } 655 } else { 656 passphrase = xstrdup(""); 657 } 658 if (private->type != KEY_RSA1) { 659 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 660 key_free(private); 661 exit(1); 662 } 663 printf("Key now has comment '%s'\n", comment); 664 665 if (identity_comment) { 666 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 667 } else { 668 printf("Enter new comment: "); 669 fflush(stdout); 670 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 671 memset(passphrase, 0, strlen(passphrase)); 672 key_free(private); 673 exit(1); 674 } 675 if (strchr(new_comment, '\n')) 676 *strchr(new_comment, '\n') = 0; 677 } 678 679 /* Save the file using the new passphrase. */ 680 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 681 printf("Saving the key failed: %s.\n", identity_file); 682 memset(passphrase, 0, strlen(passphrase)); 683 xfree(passphrase); 684 key_free(private); 685 xfree(comment); 686 exit(1); 687 } 688 memset(passphrase, 0, strlen(passphrase)); 689 xfree(passphrase); 690 public = key_from_private(private); 691 key_free(private); 692 693 strlcat(identity_file, ".pub", sizeof(identity_file)); 694 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 695 if (fd == -1) { 696 printf("Could not save your public key in %s\n", identity_file); 697 exit(1); 698 } 699 f = fdopen(fd, "w"); 700 if (f == NULL) { 701 printf("fdopen %s failed", identity_file); 702 exit(1); 703 } 704 if (!key_write(public, f)) 705 fprintf(stderr, "write key failed"); 706 key_free(public); 707 fprintf(f, " %s\n", new_comment); 708 fclose(f); 709 710 xfree(comment); 711 712 printf("The comment in your key file has been changed.\n"); 713 exit(0); 714} 715 716static void 717usage(void) 718{ 719 fprintf(stderr, "Usage: %s [options]\n", __progname); 720 fprintf(stderr, "Options:\n"); 721 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 722 fprintf(stderr, " -c Change comment in private and public key files.\n"); 723 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); 724 fprintf(stderr, " -f filename Filename of the key file.\n"); 725 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); 726 fprintf(stderr, " -l Show fingerprint of key file.\n"); 727 fprintf(stderr, " -p Change passphrase of private key file.\n"); 728 fprintf(stderr, " -q Quiet.\n"); 729 fprintf(stderr, " -y Read private key file and print public key.\n"); 730 fprintf(stderr, " -t type Specify type of key to create.\n"); 731 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 732 fprintf(stderr, " -C comment Provide new comment.\n"); 733 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 734 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 735#ifdef SMARTCARD 736 fprintf(stderr, " -D reader Download public key from smartcard.\n"); 737 fprintf(stderr, " -U reader Upload private key to smartcard.\n"); 738#endif /* SMARTCARD */ 739 740 exit(1); 741} 742 743/* 744 * Main program for key management. 745 */ 746int 747main(int ac, char **av) 748{ 749 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 750 char *reader_id = NULL; 751 Key *private, *public; 752 struct passwd *pw; 753 struct stat st; 754 int opt, type, fd, download = 0; 755 FILE *f; 756 757 extern int optind; 758 extern char *optarg; 759 760 __progname = get_progname(av[0]); 761 762 SSLeay_add_all_algorithms(); 763 init_rng(); 764 seed_rng(); 765 766 /* we need this for the home * directory. */ 767 pw = getpwuid(getuid()); 768 if (!pw) { 769 printf("You don't exist, go away!\n"); 770 exit(1); 771 } 772 if (gethostname(hostname, sizeof(hostname)) < 0) { 773 perror("gethostname"); 774 exit(1); 775 } 776 777 while ((opt = getopt(ac, av, "deiqpclBRxXyb:f:t:U:D:P:N:C:")) != -1) { 778 switch (opt) { 779 case 'b': 780 bits = atoi(optarg); 781 if (bits < 512 || bits > 32768) { 782 printf("Bits has bad value.\n"); 783 exit(1); 784 } 785 break; 786 case 'l': 787 print_fingerprint = 1; 788 break; 789 case 'B': 790 print_bubblebabble = 1; 791 break; 792 case 'p': 793 change_passphrase = 1; 794 break; 795 case 'c': 796 change_comment = 1; 797 break; 798 case 'f': 799 strlcpy(identity_file, optarg, sizeof(identity_file)); 800 have_identity = 1; 801 break; 802 case 'P': 803 identity_passphrase = optarg; 804 break; 805 case 'N': 806 identity_new_passphrase = optarg; 807 break; 808 case 'C': 809 identity_comment = optarg; 810 break; 811 case 'q': 812 quiet = 1; 813 break; 814 case 'R': 815 /* unused */ 816 exit(0); 817 break; 818 case 'e': 819 case 'x': 820 /* export key */ 821 convert_to_ssh2 = 1; 822 break; 823 case 'i': 824 case 'X': 825 /* import key */ 826 convert_from_ssh2 = 1; 827 break; 828 case 'y': 829 print_public = 1; 830 break; 831 case 'd': 832 key_type_name = "dsa"; 833 break; 834 case 't': 835 key_type_name = optarg; 836 break; 837 case 'D': 838 download = 1; 839 case 'U': 840 reader_id = optarg; 841 break; 842 case '?': 843 default: 844 usage(); 845 } 846 } 847 if (optind < ac) { 848 printf("Too many arguments.\n"); 849 usage(); 850 } 851 if (change_passphrase && change_comment) { 852 printf("Can only have one of -p and -c.\n"); 853 usage(); 854 } 855 if (print_fingerprint || print_bubblebabble) 856 do_fingerprint(pw); 857 if (change_passphrase) 858 do_change_passphrase(pw); 859 if (change_comment) 860 do_change_comment(pw); 861 if (convert_to_ssh2) 862 do_convert_to_ssh2(pw); 863 if (convert_from_ssh2) 864 do_convert_from_ssh2(pw); 865 if (print_public) 866 do_print_public(pw); 867 if (reader_id != NULL) { 868#ifdef SMARTCARD 869 if (download) 870 do_download(pw, reader_id); 871 else 872 do_upload(pw, reader_id); 873#else /* SMARTCARD */ 874 fatal("no support for smartcards."); 875#endif /* SMARTCARD */ 876 } 877 878 arc4random_stir(); 879 880 if (key_type_name == NULL) { 881 printf("You must specify a key type (-t).\n"); 882 usage(); 883 } 884 type = key_type_from_name(key_type_name); 885 if (type == KEY_UNSPEC) { 886 fprintf(stderr, "unknown key type %s\n", key_type_name); 887 exit(1); 888 } 889 if (!quiet) 890 printf("Generating public/private %s key pair.\n", key_type_name); 891 private = key_generate(type, bits); 892 if (private == NULL) { 893 fprintf(stderr, "key_generate failed"); 894 exit(1); 895 } 896 public = key_from_private(private); 897 898 if (!have_identity) 899 ask_filename(pw, "Enter file in which to save the key"); 900 901 /* Create ~/.ssh directory if it doesn\'t already exist. */ 902 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); 903 if (strstr(identity_file, dotsshdir) != NULL && 904 stat(dotsshdir, &st) < 0) { 905 if (mkdir(dotsshdir, 0700) < 0) 906 error("Could not create directory '%s'.", dotsshdir); 907 else if (!quiet) 908 printf("Created directory '%s'.\n", dotsshdir); 909 } 910 /* If the file already exists, ask the user to confirm. */ 911 if (stat(identity_file, &st) >= 0) { 912 char yesno[3]; 913 printf("%s already exists.\n", identity_file); 914 printf("Overwrite (y/n)? "); 915 fflush(stdout); 916 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 917 exit(1); 918 if (yesno[0] != 'y' && yesno[0] != 'Y') 919 exit(1); 920 } 921 /* Ask for a passphrase (twice). */ 922 if (identity_passphrase) 923 passphrase1 = xstrdup(identity_passphrase); 924 else if (identity_new_passphrase) 925 passphrase1 = xstrdup(identity_new_passphrase); 926 else { 927passphrase_again: 928 passphrase1 = 929 read_passphrase("Enter passphrase (empty for no " 930 "passphrase): ", RP_ALLOW_STDIN); 931 passphrase2 = read_passphrase("Enter same passphrase again: ", 932 RP_ALLOW_STDIN); 933 if (strcmp(passphrase1, passphrase2) != 0) { 934 /* 935 * The passphrases do not match. Clear them and 936 * retry. 937 */ 938 memset(passphrase1, 0, strlen(passphrase1)); 939 memset(passphrase2, 0, strlen(passphrase2)); 940 xfree(passphrase1); 941 xfree(passphrase2); 942 printf("Passphrases do not match. Try again.\n"); 943 goto passphrase_again; 944 } 945 /* Clear the other copy of the passphrase. */ 946 memset(passphrase2, 0, strlen(passphrase2)); 947 xfree(passphrase2); 948 } 949 950 if (identity_comment) { 951 strlcpy(comment, identity_comment, sizeof(comment)); 952 } else { 953 /* Create default commend field for the passphrase. */ 954 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 955 } 956 957 /* Save the key with the given passphrase and comment. */ 958 if (!key_save_private(private, identity_file, passphrase1, comment)) { 959 printf("Saving the key failed: %s.\n", identity_file); 960 memset(passphrase1, 0, strlen(passphrase1)); 961 xfree(passphrase1); 962 exit(1); 963 } 964 /* Clear the passphrase. */ 965 memset(passphrase1, 0, strlen(passphrase1)); 966 xfree(passphrase1); 967 968 /* Clear the private key and the random number generator. */ 969 key_free(private); 970 arc4random_stir(); 971 972 if (!quiet) 973 printf("Your identification has been saved in %s.\n", identity_file); 974 975 strlcat(identity_file, ".pub", sizeof(identity_file)); 976 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 977 if (fd == -1) { 978 printf("Could not save your public key in %s\n", identity_file); 979 exit(1); 980 } 981 f = fdopen(fd, "w"); 982 if (f == NULL) { 983 printf("fdopen %s failed", identity_file); 984 exit(1); 985 } 986 if (!key_write(public, f)) 987 fprintf(stderr, "write key failed"); 988 fprintf(f, " %s\n", comment); 989 fclose(f); 990 991 if (!quiet) { 992 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 993 printf("Your public key has been saved in %s.\n", 994 identity_file); 995 printf("The key fingerprint is:\n"); 996 printf("%s %s\n", fp, comment); 997 xfree(fp); 998 } 999 1000 key_free(public); 1001 exit(0); 1002} 1003