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" 15 RCSID("$OpenBSD: ssh-keygen.c,v 1.112 2003/11/23 23:18:45 djm 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 #include "moduli.h" 31 32 #ifdef SMARTCARD 33 #include "scard.h" 34 #endif 35 #include "dns.h" 36 37 /* Number of bits in the RSA/DSA key. This value can be changed on the command line. */ 38 int bits = 1024; 39 40 /* 41 * Flag indicating that we just want to change the passphrase. This can be 42 * set on the command line. 43 */ 44 int change_passphrase = 0; 45 46 /* 47 * Flag indicating that we just want to change the comment. This can be set 48 * on the command line. 49 */ 50 int change_comment = 0; 51 52 int quiet = 0; 53 54 /* Flag indicating that we just want to see the key fingerprint */ 55 int print_fingerprint = 0; 56 int print_bubblebabble = 0; 57 58 /* The identity file name, given on the command line or entered by the user. */ 59 char identity_file[1024]; 60 int have_identity = 0; 61 62 /* This is set to the passphrase if given on the command line. */ 63 char *identity_passphrase = NULL; 64 65 /* This is set to the new passphrase if given on the command line. */ 66 char *identity_new_passphrase = NULL; 67 68 /* This is set to the new comment if given on the command line. */ 69 char *identity_comment = NULL; 70 71 /* Dump public key file in format used by real and the original SSH 2 */ 72 int convert_to_ssh2 = 0; 73 int convert_from_ssh2 = 0; 74 int print_public = 0; 75 int print_generic = 0; 76 77 char *key_type_name = NULL; 78 79 /* argv0 */ 80 extern char *__progname; 81 82 char hostname[MAXHOSTNAMELEN]; 83 84 static void 85 ask_filename(struct passwd *pw, const char *prompt) 86 { 87 char buf[1024]; 88 char *name = NULL; 89 90 if (key_type_name == NULL) 91 name = _PATH_SSH_CLIENT_ID_RSA; 92 else 93 switch (key_type_from_name(key_type_name)) { 94 case KEY_RSA1: 95 name = _PATH_SSH_CLIENT_IDENTITY; 96 break; 97 case KEY_DSA: 98 name = _PATH_SSH_CLIENT_ID_DSA; 99 break; 100 case KEY_RSA: 101 name = _PATH_SSH_CLIENT_ID_RSA; 102 break; 103 default: 104 fprintf(stderr, "bad key type"); 105 exit(1); 106 break; 107 } 108 109 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 110 fprintf(stderr, "%s (%s): ", prompt, identity_file); 111 if (fgets(buf, sizeof(buf), stdin) == NULL) 112 exit(1); 113 if (strchr(buf, '\n')) 114 *strchr(buf, '\n') = 0; 115 if (strcmp(buf, "") != 0) 116 strlcpy(identity_file, buf, sizeof(identity_file)); 117 have_identity = 1; 118 } 119 120 static Key * 121 load_identity(char *filename) 122 { 123 char *pass; 124 Key *prv; 125 126 prv = key_load_private(filename, "", NULL); 127 if (prv == NULL) { 128 if (identity_passphrase) 129 pass = xstrdup(identity_passphrase); 130 else 131 pass = read_passphrase("Enter passphrase: ", 132 RP_ALLOW_STDIN); 133 prv = key_load_private(filename, pass, NULL); 134 memset(pass, 0, strlen(pass)); 135 xfree(pass); 136 } 137 return prv; 138 } 139 140 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 141 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 142 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 143 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 144 145 static void 146 do_convert_to_ssh2(struct passwd *pw) 147 { 148 Key *k; 149 u_int len; 150 u_char *blob; 151 struct stat st; 152 153 if (!have_identity) 154 ask_filename(pw, "Enter file in which the key is"); 155 if (stat(identity_file, &st) < 0) { 156 perror(identity_file); 157 exit(1); 158 } 159 if ((k = key_load_public(identity_file, NULL)) == NULL) { 160 if ((k = load_identity(identity_file)) == NULL) { 161 fprintf(stderr, "load failed\n"); 162 exit(1); 163 } 164 } 165 if (k->type == KEY_RSA1) { 166 fprintf(stderr, "version 1 keys are not supported\n"); 167 exit(1); 168 } 169 if (key_to_blob(k, &blob, &len) <= 0) { 170 fprintf(stderr, "key_to_blob failed\n"); 171 exit(1); 172 } 173 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 174 fprintf(stdout, 175 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n", 176 key_size(k), key_type(k), 177 pw->pw_name, hostname); 178 dump_base64(stdout, blob, len); 179 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 180 key_free(k); 181 xfree(blob); 182 exit(0); 183 } 184 185 static void 186 buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 187 { 188 u_int bits = buffer_get_int(b); 189 u_int bytes = (bits + 7) / 8; 190 191 if (buffer_len(b) < bytes) 192 fatal("buffer_get_bignum_bits: input buffer too small: " 193 "need %d have %d", bytes, buffer_len(b)); 194 BN_bin2bn(buffer_ptr(b), bytes, value); 195 buffer_consume(b, bytes); 196 } 197 198 static Key * 199 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 200 { 201 Buffer b; 202 Key *key = NULL; 203 char *type, *cipher; 204 u_char *sig, data[] = "abcde12345"; 205 int magic, rlen, ktype, i1, i2, i3, i4; 206 u_int slen; 207 u_long e; 208 209 buffer_init(&b); 210 buffer_append(&b, blob, blen); 211 212 magic = buffer_get_int(&b); 213 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 214 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 215 buffer_free(&b); 216 return NULL; 217 } 218 i1 = buffer_get_int(&b); 219 type = buffer_get_string(&b, NULL); 220 cipher = buffer_get_string(&b, NULL); 221 i2 = buffer_get_int(&b); 222 i3 = buffer_get_int(&b); 223 i4 = buffer_get_int(&b); 224 debug("ignore (%d %d %d %d)", i1,i2,i3,i4); 225 if (strcmp(cipher, "none") != 0) { 226 error("unsupported cipher %s", cipher); 227 xfree(cipher); 228 buffer_free(&b); 229 xfree(type); 230 return NULL; 231 } 232 xfree(cipher); 233 234 if (strstr(type, "dsa")) { 235 ktype = KEY_DSA; 236 } else if (strstr(type, "rsa")) { 237 ktype = KEY_RSA; 238 } else { 239 xfree(type); 240 return NULL; 241 } 242 key = key_new_private(ktype); 243 xfree(type); 244 245 switch (key->type) { 246 case KEY_DSA: 247 buffer_get_bignum_bits(&b, key->dsa->p); 248 buffer_get_bignum_bits(&b, key->dsa->g); 249 buffer_get_bignum_bits(&b, key->dsa->q); 250 buffer_get_bignum_bits(&b, key->dsa->pub_key); 251 buffer_get_bignum_bits(&b, key->dsa->priv_key); 252 break; 253 case KEY_RSA: 254 e = buffer_get_char(&b); 255 debug("e %lx", e); 256 if (e < 30) { 257 e <<= 8; 258 e += buffer_get_char(&b); 259 debug("e %lx", e); 260 e <<= 8; 261 e += buffer_get_char(&b); 262 debug("e %lx", e); 263 } 264 if (!BN_set_word(key->rsa->e, e)) { 265 buffer_free(&b); 266 key_free(key); 267 return NULL; 268 } 269 buffer_get_bignum_bits(&b, key->rsa->d); 270 buffer_get_bignum_bits(&b, key->rsa->n); 271 buffer_get_bignum_bits(&b, key->rsa->iqmp); 272 buffer_get_bignum_bits(&b, key->rsa->q); 273 buffer_get_bignum_bits(&b, key->rsa->p); 274 rsa_generate_additional_parameters(key->rsa); 275 break; 276 } 277 rlen = buffer_len(&b); 278 if (rlen != 0) 279 error("do_convert_private_ssh2_from_blob: " 280 "remaining bytes in key blob %d", rlen); 281 buffer_free(&b); 282 283 /* try the key */ 284 key_sign(key, &sig, &slen, data, sizeof(data)); 285 key_verify(key, sig, slen, data, sizeof(data)); 286 xfree(sig); 287 return key; 288 } 289 290 static void 291 do_convert_from_ssh2(struct passwd *pw) 292 { 293 Key *k; 294 int blen; 295 u_int len; 296 char line[1024], *p; 297 u_char blob[8096]; 298 char encoded[8096]; 299 struct stat st; 300 int escaped = 0, private = 0, ok; 301 FILE *fp; 302 303 if (!have_identity) 304 ask_filename(pw, "Enter file in which the key is"); 305 if (stat(identity_file, &st) < 0) { 306 perror(identity_file); 307 exit(1); 308 } 309 fp = fopen(identity_file, "r"); 310 if (fp == NULL) { 311 perror(identity_file); 312 exit(1); 313 } 314 encoded[0] = '\0'; 315 while (fgets(line, sizeof(line), fp)) { 316 if (!(p = strchr(line, '\n'))) { 317 fprintf(stderr, "input line too long.\n"); 318 exit(1); 319 } 320 if (p > line && p[-1] == '\\') 321 escaped++; 322 if (strncmp(line, "----", 4) == 0 || 323 strstr(line, ": ") != NULL) { 324 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 325 private = 1; 326 if (strstr(line, " END ") != NULL) { 327 break; 328 } 329 /* fprintf(stderr, "ignore: %s", line); */ 330 continue; 331 } 332 if (escaped) { 333 escaped--; 334 /* fprintf(stderr, "escaped: %s", line); */ 335 continue; 336 } 337 *p = '\0'; 338 strlcat(encoded, line, sizeof(encoded)); 339 } 340 len = strlen(encoded); 341 if (((len % 4) == 3) && 342 (encoded[len-1] == '=') && 343 (encoded[len-2] == '=') && 344 (encoded[len-3] == '=')) 345 encoded[len-3] = '\0'; 346 blen = uudecode(encoded, blob, sizeof(blob)); 347 if (blen < 0) { 348 fprintf(stderr, "uudecode failed.\n"); 349 exit(1); 350 } 351 k = private ? 352 do_convert_private_ssh2_from_blob(blob, blen) : 353 key_from_blob(blob, blen); 354 if (k == NULL) { 355 fprintf(stderr, "decode blob failed.\n"); 356 exit(1); 357 } 358 ok = private ? 359 (k->type == KEY_DSA ? 360 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : 361 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : 362 key_write(k, stdout); 363 if (!ok) { 364 fprintf(stderr, "key write failed"); 365 exit(1); 366 } 367 key_free(k); 368 if (!private) 369 fprintf(stdout, "\n"); 370 fclose(fp); 371 exit(0); 372 } 373 374 static void 375 do_print_public(struct passwd *pw) 376 { 377 Key *prv; 378 struct stat st; 379 380 if (!have_identity) 381 ask_filename(pw, "Enter file in which the key is"); 382 if (stat(identity_file, &st) < 0) { 383 perror(identity_file); 384 exit(1); 385 } 386 prv = load_identity(identity_file); 387 if (prv == NULL) { 388 fprintf(stderr, "load failed\n"); 389 exit(1); 390 } 391 if (!key_write(prv, stdout)) 392 fprintf(stderr, "key_write failed"); 393 key_free(prv); 394 fprintf(stdout, "\n"); 395 exit(0); 396 } 397 398 #ifdef SMARTCARD 399 static void 400 do_upload(struct passwd *pw, const char *sc_reader_id) 401 { 402 Key *prv = NULL; 403 struct stat st; 404 int ret; 405 406 if (!have_identity) 407 ask_filename(pw, "Enter file in which the key is"); 408 if (stat(identity_file, &st) < 0) { 409 perror(identity_file); 410 exit(1); 411 } 412 prv = load_identity(identity_file); 413 if (prv == NULL) { 414 error("load failed"); 415 exit(1); 416 } 417 ret = sc_put_key(prv, sc_reader_id); 418 key_free(prv); 419 if (ret < 0) 420 exit(1); 421 logit("loading key done"); 422 exit(0); 423 } 424 425 static void 426 do_download(struct passwd *pw, const char *sc_reader_id) 427 { 428 Key **keys = NULL; 429 int i; 430 431 keys = sc_get_keys(sc_reader_id, NULL); 432 if (keys == NULL) 433 fatal("cannot read public key from smartcard"); 434 for (i = 0; keys[i]; i++) { 435 key_write(keys[i], stdout); 436 key_free(keys[i]); 437 fprintf(stdout, "\n"); 438 } 439 xfree(keys); 440 exit(0); 441 } 442 #endif /* SMARTCARD */ 443 444 static void 445 do_fingerprint(struct passwd *pw) 446 { 447 FILE *f; 448 Key *public; 449 char *comment = NULL, *cp, *ep, line[16*1024], *fp; 450 int i, skip = 0, num = 1, invalid = 1; 451 enum fp_rep rep; 452 enum fp_type fptype; 453 struct stat st; 454 455 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 456 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 457 458 if (!have_identity) 459 ask_filename(pw, "Enter file in which the key is"); 460 if (stat(identity_file, &st) < 0) { 461 perror(identity_file); 462 exit(1); 463 } 464 public = key_load_public(identity_file, &comment); 465 if (public != NULL) { 466 fp = key_fingerprint(public, fptype, rep); 467 printf("%u %s %s\n", key_size(public), fp, comment); 468 key_free(public); 469 xfree(comment); 470 xfree(fp); 471 exit(0); 472 } 473 if (comment) 474 xfree(comment); 475 476 f = fopen(identity_file, "r"); 477 if (f != NULL) { 478 while (fgets(line, sizeof(line), f)) { 479 i = strlen(line) - 1; 480 if (line[i] != '\n') { 481 error("line %d too long: %.40s...", num, line); 482 skip = 1; 483 continue; 484 } 485 num++; 486 if (skip) { 487 skip = 0; 488 continue; 489 } 490 line[i] = '\0'; 491 492 /* Skip leading whitespace, empty and comment lines. */ 493 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 494 ; 495 if (!*cp || *cp == '\n' || *cp == '#') 496 continue ; 497 i = strtol(cp, &ep, 10); 498 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 499 int quoted = 0; 500 comment = cp; 501 for (; *cp && (quoted || (*cp != ' ' && 502 *cp != '\t')); cp++) { 503 if (*cp == '\\' && cp[1] == '"') 504 cp++; /* Skip both */ 505 else if (*cp == '"') 506 quoted = !quoted; 507 } 508 if (!*cp) 509 continue; 510 *cp++ = '\0'; 511 } 512 ep = cp; 513 public = key_new(KEY_RSA1); 514 if (key_read(public, &cp) != 1) { 515 cp = ep; 516 key_free(public); 517 public = key_new(KEY_UNSPEC); 518 if (key_read(public, &cp) != 1) { 519 key_free(public); 520 continue; 521 } 522 } 523 comment = *cp ? cp : comment; 524 fp = key_fingerprint(public, fptype, rep); 525 printf("%u %s %s\n", key_size(public), fp, 526 comment ? comment : "no comment"); 527 xfree(fp); 528 key_free(public); 529 invalid = 0; 530 } 531 fclose(f); 532 } 533 if (invalid) { 534 printf("%s is not a public key file.\n", identity_file); 535 exit(1); 536 } 537 exit(0); 538 } 539 540 /* 541 * Perform changing a passphrase. The argument is the passwd structure 542 * for the current user. 543 */ 544 static void 545 do_change_passphrase(struct passwd *pw) 546 { 547 char *comment; 548 char *old_passphrase, *passphrase1, *passphrase2; 549 struct stat st; 550 Key *private; 551 552 if (!have_identity) 553 ask_filename(pw, "Enter file in which the key is"); 554 if (stat(identity_file, &st) < 0) { 555 perror(identity_file); 556 exit(1); 557 } 558 /* Try to load the file with empty passphrase. */ 559 private = key_load_private(identity_file, "", &comment); 560 if (private == NULL) { 561 if (identity_passphrase) 562 old_passphrase = xstrdup(identity_passphrase); 563 else 564 old_passphrase = 565 read_passphrase("Enter old passphrase: ", 566 RP_ALLOW_STDIN); 567 private = key_load_private(identity_file, old_passphrase, 568 &comment); 569 memset(old_passphrase, 0, strlen(old_passphrase)); 570 xfree(old_passphrase); 571 if (private == NULL) { 572 printf("Bad passphrase.\n"); 573 exit(1); 574 } 575 } 576 printf("Key has comment '%s'\n", comment); 577 578 /* Ask the new passphrase (twice). */ 579 if (identity_new_passphrase) { 580 passphrase1 = xstrdup(identity_new_passphrase); 581 passphrase2 = NULL; 582 } else { 583 passphrase1 = 584 read_passphrase("Enter new passphrase (empty for no " 585 "passphrase): ", RP_ALLOW_STDIN); 586 passphrase2 = read_passphrase("Enter same passphrase again: ", 587 RP_ALLOW_STDIN); 588 589 /* Verify that they are the same. */ 590 if (strcmp(passphrase1, passphrase2) != 0) { 591 memset(passphrase1, 0, strlen(passphrase1)); 592 memset(passphrase2, 0, strlen(passphrase2)); 593 xfree(passphrase1); 594 xfree(passphrase2); 595 printf("Pass phrases do not match. Try again.\n"); 596 exit(1); 597 } 598 /* Destroy the other copy. */ 599 memset(passphrase2, 0, strlen(passphrase2)); 600 xfree(passphrase2); 601 } 602 603 /* Save the file using the new passphrase. */ 604 if (!key_save_private(private, identity_file, passphrase1, comment)) { 605 printf("Saving the key failed: %s.\n", identity_file); 606 memset(passphrase1, 0, strlen(passphrase1)); 607 xfree(passphrase1); 608 key_free(private); 609 xfree(comment); 610 exit(1); 611 } 612 /* Destroy the passphrase and the copy of the key in memory. */ 613 memset(passphrase1, 0, strlen(passphrase1)); 614 xfree(passphrase1); 615 key_free(private); /* Destroys contents */ 616 xfree(comment); 617 618 printf("Your identification has been saved with the new passphrase.\n"); 619 exit(0); 620 } 621 622 /* 623 * Print the SSHFP RR. 624 */ 625 static void 626 do_print_resource_record(struct passwd *pw, char *hostname) 627 { 628 Key *public; 629 char *comment = NULL; 630 struct stat st; 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 public = key_load_public(identity_file, &comment); 639 if (public != NULL) { 640 export_dns_rr(hostname, public, stdout, print_generic); 641 key_free(public); 642 xfree(comment); 643 exit(0); 644 } 645 if (comment) 646 xfree(comment); 647 648 printf("failed to read v2 public key from %s.\n", identity_file); 649 exit(1); 650 } 651 652 /* 653 * Change the comment of a private key file. 654 */ 655 static void 656 do_change_comment(struct passwd *pw) 657 { 658 char new_comment[1024], *comment, *passphrase; 659 Key *private; 660 Key *public; 661 struct stat st; 662 FILE *f; 663 int fd; 664 665 if (!have_identity) 666 ask_filename(pw, "Enter file in which the key is"); 667 if (stat(identity_file, &st) < 0) { 668 perror(identity_file); 669 exit(1); 670 } 671 private = key_load_private(identity_file, "", &comment); 672 if (private == NULL) { 673 if (identity_passphrase) 674 passphrase = xstrdup(identity_passphrase); 675 else if (identity_new_passphrase) 676 passphrase = xstrdup(identity_new_passphrase); 677 else 678 passphrase = read_passphrase("Enter passphrase: ", 679 RP_ALLOW_STDIN); 680 /* Try to load using the passphrase. */ 681 private = key_load_private(identity_file, passphrase, &comment); 682 if (private == NULL) { 683 memset(passphrase, 0, strlen(passphrase)); 684 xfree(passphrase); 685 printf("Bad passphrase.\n"); 686 exit(1); 687 } 688 } else { 689 passphrase = xstrdup(""); 690 } 691 if (private->type != KEY_RSA1) { 692 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 693 key_free(private); 694 exit(1); 695 } 696 printf("Key now has comment '%s'\n", comment); 697 698 if (identity_comment) { 699 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 700 } else { 701 printf("Enter new comment: "); 702 fflush(stdout); 703 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 704 memset(passphrase, 0, strlen(passphrase)); 705 key_free(private); 706 exit(1); 707 } 708 if (strchr(new_comment, '\n')) 709 *strchr(new_comment, '\n') = 0; 710 } 711 712 /* Save the file using the new passphrase. */ 713 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 714 printf("Saving the key failed: %s.\n", identity_file); 715 memset(passphrase, 0, strlen(passphrase)); 716 xfree(passphrase); 717 key_free(private); 718 xfree(comment); 719 exit(1); 720 } 721 memset(passphrase, 0, strlen(passphrase)); 722 xfree(passphrase); 723 public = key_from_private(private); 724 key_free(private); 725 726 strlcat(identity_file, ".pub", sizeof(identity_file)); 727 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 728 if (fd == -1) { 729 printf("Could not save your public key in %s\n", identity_file); 730 exit(1); 731 } 732 f = fdopen(fd, "w"); 733 if (f == NULL) { 734 printf("fdopen %s failed", identity_file); 735 exit(1); 736 } 737 if (!key_write(public, f)) 738 fprintf(stderr, "write key failed"); 739 key_free(public); 740 fprintf(f, " %s\n", new_comment); 741 fclose(f); 742 743 xfree(comment); 744 745 printf("The comment in your key file has been changed.\n"); 746 exit(0); 747 } 748 749 static void 750 usage(void) 751 { 752 fprintf(stderr, "Usage: %s [options]\n", __progname); 753 fprintf(stderr, "Options:\n"); 754 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 755 fprintf(stderr, " -c Change comment in private and public key files.\n"); 756 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); 757 fprintf(stderr, " -f filename Filename of the key file.\n"); 758 fprintf(stderr, " -g Use generic DNS resource record format.\n"); 759 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); 760 fprintf(stderr, " -l Show fingerprint of key file.\n"); 761 fprintf(stderr, " -p Change passphrase of private key file.\n"); 762 fprintf(stderr, " -q Quiet.\n"); 763 fprintf(stderr, " -y Read private key file and print public key.\n"); 764 fprintf(stderr, " -t type Specify type of key to create.\n"); 765 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 766 fprintf(stderr, " -C comment Provide new comment.\n"); 767 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 768 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 769 fprintf(stderr, " -r hostname Print DNS resource record.\n"); 770 #ifdef SMARTCARD 771 fprintf(stderr, " -D reader Download public key from smartcard.\n"); 772 fprintf(stderr, " -U reader Upload private key to smartcard.\n"); 773 #endif /* SMARTCARD */ 774 775 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli\n"); 776 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli\n"); 777 778 exit(1); 779 } 780 781 /* 782 * Main program for key management. 783 */ 784 int 785 main(int ac, char **av) 786 { 787 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 788 char out_file[MAXPATHLEN], *reader_id = NULL; 789 char *resource_record_hostname = NULL; 790 Key *private, *public; 791 struct passwd *pw; 792 struct stat st; 793 int opt, type, fd, download = 0, memory = 0; 794 int generator_wanted = 0, trials = 100; 795 int do_gen_candidates = 0, do_screen_candidates = 0; 796 BIGNUM *start = NULL; 797 FILE *f; 798 799 extern int optind; 800 extern char *optarg; 801 802 SSLeay_add_all_algorithms(); 803 log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 804 805 /* we need this for the home * directory. */ 806 pw = getpwuid(getuid()); 807 if (!pw) { 808 printf("You don't exist, go away!\n"); 809 exit(1); 810 } 811 if (gethostname(hostname, sizeof(hostname)) < 0) { 812 perror("gethostname"); 813 exit(1); 814 } 815 816 while ((opt = getopt(ac, av, 817 "degiqpclBRxXyb:f:t:U:D:P:N:C:r:g:T:G:M:S:a:W:")) != -1) { 818 switch (opt) { 819 case 'b': 820 bits = atoi(optarg); 821 if (bits < 512 || bits > 32768) { 822 printf("Bits has bad value.\n"); 823 exit(1); 824 } 825 break; 826 case 'l': 827 print_fingerprint = 1; 828 break; 829 case 'B': 830 print_bubblebabble = 1; 831 break; 832 case 'p': 833 change_passphrase = 1; 834 break; 835 case 'c': 836 change_comment = 1; 837 break; 838 case 'f': 839 strlcpy(identity_file, optarg, sizeof(identity_file)); 840 have_identity = 1; 841 break; 842 case 'g': 843 print_generic = 1; 844 break; 845 case 'P': 846 identity_passphrase = optarg; 847 break; 848 case 'N': 849 identity_new_passphrase = optarg; 850 break; 851 case 'C': 852 identity_comment = optarg; 853 break; 854 case 'q': 855 quiet = 1; 856 break; 857 case 'R': 858 /* unused */ 859 exit(0); 860 break; 861 case 'e': 862 case 'x': 863 /* export key */ 864 convert_to_ssh2 = 1; 865 break; 866 case 'i': 867 case 'X': 868 /* import key */ 869 convert_from_ssh2 = 1; 870 break; 871 case 'y': 872 print_public = 1; 873 break; 874 case 'd': 875 key_type_name = "dsa"; 876 break; 877 case 't': 878 key_type_name = optarg; 879 break; 880 case 'D': 881 download = 1; 882 case 'U': 883 reader_id = optarg; 884 break; 885 case 'r': 886 resource_record_hostname = optarg; 887 break; 888 case 'W': 889 generator_wanted = atoi(optarg); 890 if (generator_wanted < 1) 891 fatal("Desired generator has bad value."); 892 break; 893 case 'a': 894 trials = atoi(optarg); 895 if (trials < TRIAL_MINIMUM) { 896 fatal("Minimum primality trials is %d", 897 TRIAL_MINIMUM); 898 } 899 break; 900 case 'M': 901 memory = atoi(optarg); 902 if (memory != 0 && 903 (memory < LARGE_MINIMUM || memory > LARGE_MAXIMUM)) { 904 fatal("Invalid memory amount (min %ld, max %ld)", 905 LARGE_MINIMUM, LARGE_MAXIMUM); 906 } 907 break; 908 case 'G': 909 do_gen_candidates = 1; 910 strlcpy(out_file, optarg, sizeof(out_file)); 911 break; 912 case 'T': 913 do_screen_candidates = 1; 914 strlcpy(out_file, optarg, sizeof(out_file)); 915 break; 916 case 'S': 917 /* XXX - also compare length against bits */ 918 if (BN_hex2bn(&start, optarg) == 0) 919 fatal("Invalid start point."); 920 break; 921 case '?': 922 default: 923 usage(); 924 } 925 } 926 if (optind < ac) { 927 printf("Too many arguments.\n"); 928 usage(); 929 } 930 if (change_passphrase && change_comment) { 931 printf("Can only have one of -p and -c.\n"); 932 usage(); 933 } 934 if (print_fingerprint || print_bubblebabble) 935 do_fingerprint(pw); 936 if (change_passphrase) 937 do_change_passphrase(pw); 938 if (change_comment) 939 do_change_comment(pw); 940 if (convert_to_ssh2) 941 do_convert_to_ssh2(pw); 942 if (convert_from_ssh2) 943 do_convert_from_ssh2(pw); 944 if (print_public) 945 do_print_public(pw); 946 if (resource_record_hostname != NULL) { 947 do_print_resource_record(pw, resource_record_hostname); 948 } 949 if (reader_id != NULL) { 950 #ifdef SMARTCARD 951 if (download) 952 do_download(pw, reader_id); 953 else 954 do_upload(pw, reader_id); 955 #else /* SMARTCARD */ 956 fatal("no support for smartcards."); 957 #endif /* SMARTCARD */ 958 } 959 960 if (do_gen_candidates) { 961 FILE *out = fopen(out_file, "w"); 962 963 if (out == NULL) { 964 error("Couldn't open modulus candidate file \"%s\": %s", 965 out_file, strerror(errno)); 966 return (1); 967 } 968 if (gen_candidates(out, memory, bits, start) != 0) 969 fatal("modulus candidate generation failed\n"); 970 971 return (0); 972 } 973 974 if (do_screen_candidates) { 975 FILE *in; 976 FILE *out = fopen(out_file, "w"); 977 978 if (have_identity && strcmp(identity_file, "-") != 0) { 979 if ((in = fopen(identity_file, "r")) == NULL) { 980 fatal("Couldn't open modulus candidate " 981 "file \"%s\": %s", identity_file, 982 strerror(errno)); 983 } 984 } else 985 in = stdin; 986 987 if (out == NULL) { 988 fatal("Couldn't open moduli file \"%s\": %s", 989 out_file, strerror(errno)); 990 } 991 if (prime_test(in, out, trials, generator_wanted) != 0) 992 fatal("modulus screening failed\n"); 993 return (0); 994 } 995 996 arc4random_stir(); 997 998 if (key_type_name == NULL) { 999 printf("You must specify a key type (-t).\n"); 1000 usage(); 1001 } 1002 type = key_type_from_name(key_type_name); 1003 if (type == KEY_UNSPEC) { 1004 fprintf(stderr, "unknown key type %s\n", key_type_name); 1005 exit(1); 1006 } 1007 if (!quiet) 1008 printf("Generating public/private %s key pair.\n", key_type_name); 1009 private = key_generate(type, bits); 1010 if (private == NULL) { 1011 fprintf(stderr, "key_generate failed"); 1012 exit(1); 1013 } 1014 public = key_from_private(private); 1015 1016 if (!have_identity) 1017 ask_filename(pw, "Enter file in which to save the key"); 1018 1019 /* Create ~/.ssh directory if it doesn\'t already exist. */ 1020 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); 1021 if (strstr(identity_file, dotsshdir) != NULL && 1022 stat(dotsshdir, &st) < 0) { 1023 if (mkdir(dotsshdir, 0700) < 0) 1024 error("Could not create directory '%s'.", dotsshdir); 1025 else if (!quiet) 1026 printf("Created directory '%s'.\n", dotsshdir); 1027 } 1028 /* If the file already exists, ask the user to confirm. */ 1029 if (stat(identity_file, &st) >= 0) { 1030 char yesno[3]; 1031 printf("%s already exists.\n", identity_file); 1032 printf("Overwrite (y/n)? "); 1033 fflush(stdout); 1034 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 1035 exit(1); 1036 if (yesno[0] != 'y' && yesno[0] != 'Y') 1037 exit(1); 1038 } 1039 /* Ask for a passphrase (twice). */ 1040 if (identity_passphrase) 1041 passphrase1 = xstrdup(identity_passphrase); 1042 else if (identity_new_passphrase) 1043 passphrase1 = xstrdup(identity_new_passphrase); 1044 else { 1045 passphrase_again: 1046 passphrase1 = 1047 read_passphrase("Enter passphrase (empty for no " 1048 "passphrase): ", RP_ALLOW_STDIN); 1049 passphrase2 = read_passphrase("Enter same passphrase again: ", 1050 RP_ALLOW_STDIN); 1051 if (strcmp(passphrase1, passphrase2) != 0) { 1052 /* 1053 * The passphrases do not match. Clear them and 1054 * retry. 1055 */ 1056 memset(passphrase1, 0, strlen(passphrase1)); 1057 memset(passphrase2, 0, strlen(passphrase2)); 1058 xfree(passphrase1); 1059 xfree(passphrase2); 1060 printf("Passphrases do not match. Try again.\n"); 1061 goto passphrase_again; 1062 } 1063 /* Clear the other copy of the passphrase. */ 1064 memset(passphrase2, 0, strlen(passphrase2)); 1065 xfree(passphrase2); 1066 } 1067 1068 if (identity_comment) { 1069 strlcpy(comment, identity_comment, sizeof(comment)); 1070 } else { 1071 /* Create default commend field for the passphrase. */ 1072 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 1073 } 1074 1075 /* Save the key with the given passphrase and comment. */ 1076 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1077 printf("Saving the key failed: %s.\n", identity_file); 1078 memset(passphrase1, 0, strlen(passphrase1)); 1079 xfree(passphrase1); 1080 exit(1); 1081 } 1082 /* Clear the passphrase. */ 1083 memset(passphrase1, 0, strlen(passphrase1)); 1084 xfree(passphrase1); 1085 1086 /* Clear the private key and the random number generator. */ 1087 key_free(private); 1088 arc4random_stir(); 1089 1090 if (!quiet) 1091 printf("Your identification has been saved in %s.\n", identity_file); 1092 1093 strlcat(identity_file, ".pub", sizeof(identity_file)); 1094 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1095 if (fd == -1) { 1096 printf("Could not save your public key in %s\n", identity_file); 1097 exit(1); 1098 } 1099 f = fdopen(fd, "w"); 1100 if (f == NULL) { 1101 printf("fdopen %s failed", identity_file); 1102 exit(1); 1103 } 1104 if (!key_write(public, f)) 1105 fprintf(stderr, "write key failed"); 1106 fprintf(f, " %s\n", comment); 1107 fclose(f); 1108 1109 if (!quiet) { 1110 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 1111 printf("Your public key has been saved in %s.\n", 1112 identity_file); 1113 printf("The key fingerprint is:\n"); 1114 printf("%s %s\n", fp, comment); 1115 xfree(fp); 1116 } 1117 1118 key_free(public); 1119 exit(0); 1120 } 1121