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 1.108 2003/08/14 16:08:58 markus 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 #ifdef DNS 36 #include "dns.h" 37 #endif 38 39 /* Number of bits in the RSA/DSA key. This value can be changed on the command line. */ 40 int bits = 1024; 41 42 /* 43 * Flag indicating that we just want to change the passphrase. This can be 44 * set on the command line. 45 */ 46 int change_passphrase = 0; 47 48 /* 49 * Flag indicating that we just want to change the comment. This can be set 50 * on the command line. 51 */ 52 int change_comment = 0; 53 54 int quiet = 0; 55 56 /* Flag indicating that we just want to see the key fingerprint */ 57 int print_fingerprint = 0; 58 int print_bubblebabble = 0; 59 60 /* The identity file name, given on the command line or entered by the user. */ 61 char identity_file[1024]; 62 int have_identity = 0; 63 64 /* This is set to the passphrase if given on the command line. */ 65 char *identity_passphrase = NULL; 66 67 /* This is set to the new passphrase if given on the command line. */ 68 char *identity_new_passphrase = NULL; 69 70 /* This is set to the new comment if given on the command line. */ 71 char *identity_comment = NULL; 72 73 /* Dump public key file in format used by real and the original SSH 2 */ 74 int convert_to_ssh2 = 0; 75 int convert_from_ssh2 = 0; 76 int print_public = 0; 77 int print_generic = 0; 78 79 char *key_type_name = NULL; 80 81 /* argv0 */ 82 #ifdef HAVE___PROGNAME 83 extern char *__progname; 84 #else 85 char *__progname; 86 #endif 87 88 char hostname[MAXHOSTNAMELEN]; 89 90 static void 91 ask_filename(struct passwd *pw, const char *prompt) 92 { 93 char buf[1024]; 94 char *name = NULL; 95 96 if (key_type_name == NULL) 97 name = _PATH_SSH_CLIENT_ID_RSA; 98 else 99 switch (key_type_from_name(key_type_name)) { 100 case KEY_RSA1: 101 name = _PATH_SSH_CLIENT_IDENTITY; 102 break; 103 case KEY_DSA: 104 name = _PATH_SSH_CLIENT_ID_DSA; 105 break; 106 case KEY_RSA: 107 name = _PATH_SSH_CLIENT_ID_RSA; 108 break; 109 default: 110 fprintf(stderr, "bad key type"); 111 exit(1); 112 break; 113 } 114 115 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 116 fprintf(stderr, "%s (%s): ", prompt, identity_file); 117 if (fgets(buf, sizeof(buf), stdin) == NULL) 118 exit(1); 119 if (strchr(buf, '\n')) 120 *strchr(buf, '\n') = 0; 121 if (strcmp(buf, "") != 0) 122 strlcpy(identity_file, buf, sizeof(identity_file)); 123 have_identity = 1; 124 } 125 126 static Key * 127 load_identity(char *filename) 128 { 129 char *pass; 130 Key *prv; 131 132 prv = key_load_private(filename, "", NULL); 133 if (prv == NULL) { 134 if (identity_passphrase) 135 pass = xstrdup(identity_passphrase); 136 else 137 pass = read_passphrase("Enter passphrase: ", 138 RP_ALLOW_STDIN); 139 prv = key_load_private(filename, pass, NULL); 140 memset(pass, 0, strlen(pass)); 141 xfree(pass); 142 } 143 return prv; 144 } 145 146 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 147 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 148 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 149 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 150 151 static void 152 do_convert_to_ssh2(struct passwd *pw) 153 { 154 Key *k; 155 u_int len; 156 u_char *blob; 157 struct stat st; 158 159 if (!have_identity) 160 ask_filename(pw, "Enter file in which the key is"); 161 if (stat(identity_file, &st) < 0) { 162 perror(identity_file); 163 exit(1); 164 } 165 if ((k = key_load_public(identity_file, NULL)) == NULL) { 166 if ((k = load_identity(identity_file)) == NULL) { 167 fprintf(stderr, "load failed\n"); 168 exit(1); 169 } 170 } 171 if (k->type == KEY_RSA1) { 172 fprintf(stderr, "version 1 keys are not supported\n"); 173 exit(1); 174 } 175 if (key_to_blob(k, &blob, &len) <= 0) { 176 fprintf(stderr, "key_to_blob failed\n"); 177 exit(1); 178 } 179 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 180 fprintf(stdout, 181 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n", 182 key_size(k), key_type(k), 183 pw->pw_name, hostname); 184 dump_base64(stdout, blob, len); 185 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 186 key_free(k); 187 xfree(blob); 188 exit(0); 189 } 190 191 static void 192 buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 193 { 194 int bits = buffer_get_int(b); 195 int bytes = (bits + 7) / 8; 196 197 if (buffer_len(b) < bytes) 198 fatal("buffer_get_bignum_bits: input buffer too small: " 199 "need %d have %d", bytes, buffer_len(b)); 200 BN_bin2bn(buffer_ptr(b), bytes, value); 201 buffer_consume(b, bytes); 202 } 203 204 static Key * 205 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 206 { 207 Buffer b; 208 Key *key = NULL; 209 char *type, *cipher; 210 u_char *sig, data[] = "abcde12345"; 211 int magic, rlen, ktype, i1, i2, i3, i4; 212 u_int slen; 213 u_long e; 214 215 buffer_init(&b); 216 buffer_append(&b, blob, blen); 217 218 magic = buffer_get_int(&b); 219 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 220 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 221 buffer_free(&b); 222 return NULL; 223 } 224 i1 = buffer_get_int(&b); 225 type = buffer_get_string(&b, NULL); 226 cipher = buffer_get_string(&b, NULL); 227 i2 = buffer_get_int(&b); 228 i3 = buffer_get_int(&b); 229 i4 = buffer_get_int(&b); 230 debug("ignore (%d %d %d %d)", i1,i2,i3,i4); 231 if (strcmp(cipher, "none") != 0) { 232 error("unsupported cipher %s", cipher); 233 xfree(cipher); 234 buffer_free(&b); 235 xfree(type); 236 return NULL; 237 } 238 xfree(cipher); 239 240 if (strstr(type, "dsa")) { 241 ktype = KEY_DSA; 242 } else if (strstr(type, "rsa")) { 243 ktype = KEY_RSA; 244 } else { 245 xfree(type); 246 return NULL; 247 } 248 key = key_new_private(ktype); 249 xfree(type); 250 251 switch (key->type) { 252 case KEY_DSA: 253 buffer_get_bignum_bits(&b, key->dsa->p); 254 buffer_get_bignum_bits(&b, key->dsa->g); 255 buffer_get_bignum_bits(&b, key->dsa->q); 256 buffer_get_bignum_bits(&b, key->dsa->pub_key); 257 buffer_get_bignum_bits(&b, key->dsa->priv_key); 258 break; 259 case KEY_RSA: 260 e = buffer_get_char(&b); 261 debug("e %lx", e); 262 if (e < 30) { 263 e <<= 8; 264 e += buffer_get_char(&b); 265 debug("e %lx", e); 266 e <<= 8; 267 e += buffer_get_char(&b); 268 debug("e %lx", e); 269 } 270 if (!BN_set_word(key->rsa->e, e)) { 271 buffer_free(&b); 272 key_free(key); 273 return NULL; 274 } 275 buffer_get_bignum_bits(&b, key->rsa->d); 276 buffer_get_bignum_bits(&b, key->rsa->n); 277 buffer_get_bignum_bits(&b, key->rsa->iqmp); 278 buffer_get_bignum_bits(&b, key->rsa->q); 279 buffer_get_bignum_bits(&b, key->rsa->p); 280 rsa_generate_additional_parameters(key->rsa); 281 break; 282 } 283 rlen = buffer_len(&b); 284 if (rlen != 0) 285 error("do_convert_private_ssh2_from_blob: " 286 "remaining bytes in key blob %d", rlen); 287 buffer_free(&b); 288 289 /* try the key */ 290 key_sign(key, &sig, &slen, data, sizeof(data)); 291 key_verify(key, sig, slen, data, sizeof(data)); 292 xfree(sig); 293 return key; 294 } 295 296 static void 297 do_convert_from_ssh2(struct passwd *pw) 298 { 299 Key *k; 300 int blen; 301 u_int len; 302 char line[1024], *p; 303 u_char blob[8096]; 304 char encoded[8096]; 305 struct stat st; 306 int escaped = 0, private = 0, ok; 307 FILE *fp; 308 309 if (!have_identity) 310 ask_filename(pw, "Enter file in which the key is"); 311 if (stat(identity_file, &st) < 0) { 312 perror(identity_file); 313 exit(1); 314 } 315 fp = fopen(identity_file, "r"); 316 if (fp == NULL) { 317 perror(identity_file); 318 exit(1); 319 } 320 encoded[0] = '\0'; 321 while (fgets(line, sizeof(line), fp)) { 322 if (!(p = strchr(line, '\n'))) { 323 fprintf(stderr, "input line too long.\n"); 324 exit(1); 325 } 326 if (p > line && p[-1] == '\\') 327 escaped++; 328 if (strncmp(line, "----", 4) == 0 || 329 strstr(line, ": ") != NULL) { 330 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 331 private = 1; 332 if (strstr(line, " END ") != NULL) { 333 break; 334 } 335 /* fprintf(stderr, "ignore: %s", line); */ 336 continue; 337 } 338 if (escaped) { 339 escaped--; 340 /* fprintf(stderr, "escaped: %s", line); */ 341 continue; 342 } 343 *p = '\0'; 344 strlcat(encoded, line, sizeof(encoded)); 345 } 346 len = strlen(encoded); 347 if (((len % 4) == 3) && 348 (encoded[len-1] == '=') && 349 (encoded[len-2] == '=') && 350 (encoded[len-3] == '=')) 351 encoded[len-3] = '\0'; 352 blen = uudecode(encoded, blob, sizeof(blob)); 353 if (blen < 0) { 354 fprintf(stderr, "uudecode failed.\n"); 355 exit(1); 356 } 357 k = private ? 358 do_convert_private_ssh2_from_blob(blob, blen) : 359 key_from_blob(blob, blen); 360 if (k == NULL) { 361 fprintf(stderr, "decode blob failed.\n"); 362 exit(1); 363 } 364 ok = private ? 365 (k->type == KEY_DSA ? 366 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : 367 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : 368 key_write(k, stdout); 369 if (!ok) { 370 fprintf(stderr, "key write failed"); 371 exit(1); 372 } 373 key_free(k); 374 if (!private) 375 fprintf(stdout, "\n"); 376 fclose(fp); 377 exit(0); 378 } 379 380 static void 381 do_print_public(struct passwd *pw) 382 { 383 Key *prv; 384 struct stat st; 385 386 if (!have_identity) 387 ask_filename(pw, "Enter file in which the key is"); 388 if (stat(identity_file, &st) < 0) { 389 perror(identity_file); 390 exit(1); 391 } 392 prv = load_identity(identity_file); 393 if (prv == NULL) { 394 fprintf(stderr, "load failed\n"); 395 exit(1); 396 } 397 if (!key_write(prv, stdout)) 398 fprintf(stderr, "key_write failed"); 399 key_free(prv); 400 fprintf(stdout, "\n"); 401 exit(0); 402 } 403 404 #ifdef SMARTCARD 405 static void 406 do_upload(struct passwd *pw, const char *sc_reader_id) 407 { 408 Key *prv = NULL; 409 struct stat st; 410 int ret; 411 412 if (!have_identity) 413 ask_filename(pw, "Enter file in which the key is"); 414 if (stat(identity_file, &st) < 0) { 415 perror(identity_file); 416 exit(1); 417 } 418 prv = load_identity(identity_file); 419 if (prv == NULL) { 420 error("load failed"); 421 exit(1); 422 } 423 ret = sc_put_key(prv, sc_reader_id); 424 key_free(prv); 425 if (ret < 0) 426 exit(1); 427 logit("loading key done"); 428 exit(0); 429 } 430 431 static void 432 do_download(struct passwd *pw, const char *sc_reader_id) 433 { 434 Key **keys = NULL; 435 int i; 436 437 keys = sc_get_keys(sc_reader_id, NULL); 438 if (keys == NULL) 439 fatal("cannot read public key from smartcard"); 440 for (i = 0; keys[i]; i++) { 441 key_write(keys[i], stdout); 442 key_free(keys[i]); 443 fprintf(stdout, "\n"); 444 } 445 xfree(keys); 446 exit(0); 447 } 448 #endif /* SMARTCARD */ 449 450 static void 451 do_fingerprint(struct passwd *pw) 452 { 453 FILE *f; 454 Key *public; 455 char *comment = NULL, *cp, *ep, line[16*1024], *fp; 456 int i, skip = 0, num = 1, invalid = 1; 457 enum fp_rep rep; 458 enum fp_type fptype; 459 struct stat st; 460 461 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 462 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 463 464 if (!have_identity) 465 ask_filename(pw, "Enter file in which the key is"); 466 if (stat(identity_file, &st) < 0) { 467 perror(identity_file); 468 exit(1); 469 } 470 public = key_load_public(identity_file, &comment); 471 if (public != NULL) { 472 fp = key_fingerprint(public, fptype, rep); 473 printf("%u %s %s\n", key_size(public), fp, comment); 474 key_free(public); 475 xfree(comment); 476 xfree(fp); 477 exit(0); 478 } 479 if (comment) 480 xfree(comment); 481 482 f = fopen(identity_file, "r"); 483 if (f != NULL) { 484 while (fgets(line, sizeof(line), f)) { 485 i = strlen(line) - 1; 486 if (line[i] != '\n') { 487 error("line %d too long: %.40s...", num, line); 488 skip = 1; 489 continue; 490 } 491 num++; 492 if (skip) { 493 skip = 0; 494 continue; 495 } 496 line[i] = '\0'; 497 498 /* Skip leading whitespace, empty and comment lines. */ 499 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 500 ; 501 if (!*cp || *cp == '\n' || *cp == '#') 502 continue ; 503 i = strtol(cp, &ep, 10); 504 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 505 int quoted = 0; 506 comment = cp; 507 for (; *cp && (quoted || (*cp != ' ' && 508 *cp != '\t')); cp++) { 509 if (*cp == '\\' && cp[1] == '"') 510 cp++; /* Skip both */ 511 else if (*cp == '"') 512 quoted = !quoted; 513 } 514 if (!*cp) 515 continue; 516 *cp++ = '\0'; 517 } 518 ep = cp; 519 public = key_new(KEY_RSA1); 520 if (key_read(public, &cp) != 1) { 521 cp = ep; 522 key_free(public); 523 public = key_new(KEY_UNSPEC); 524 if (key_read(public, &cp) != 1) { 525 key_free(public); 526 continue; 527 } 528 } 529 comment = *cp ? cp : comment; 530 fp = key_fingerprint(public, fptype, rep); 531 printf("%u %s %s\n", key_size(public), fp, 532 comment ? comment : "no comment"); 533 xfree(fp); 534 key_free(public); 535 invalid = 0; 536 } 537 fclose(f); 538 } 539 if (invalid) { 540 printf("%s is not a public key file.\n", identity_file); 541 exit(1); 542 } 543 exit(0); 544 } 545 546 /* 547 * Perform changing a passphrase. The argument is the passwd structure 548 * for the current user. 549 */ 550 static void 551 do_change_passphrase(struct passwd *pw) 552 { 553 char *comment; 554 char *old_passphrase, *passphrase1, *passphrase2; 555 struct stat st; 556 Key *private; 557 558 if (!have_identity) 559 ask_filename(pw, "Enter file in which the key is"); 560 if (stat(identity_file, &st) < 0) { 561 perror(identity_file); 562 exit(1); 563 } 564 /* Try to load the file with empty passphrase. */ 565 private = key_load_private(identity_file, "", &comment); 566 if (private == NULL) { 567 if (identity_passphrase) 568 old_passphrase = xstrdup(identity_passphrase); 569 else 570 old_passphrase = 571 read_passphrase("Enter old passphrase: ", 572 RP_ALLOW_STDIN); 573 private = key_load_private(identity_file, old_passphrase, 574 &comment); 575 memset(old_passphrase, 0, strlen(old_passphrase)); 576 xfree(old_passphrase); 577 if (private == NULL) { 578 printf("Bad passphrase.\n"); 579 exit(1); 580 } 581 } 582 printf("Key has comment '%s'\n", comment); 583 584 /* Ask the new passphrase (twice). */ 585 if (identity_new_passphrase) { 586 passphrase1 = xstrdup(identity_new_passphrase); 587 passphrase2 = NULL; 588 } else { 589 passphrase1 = 590 read_passphrase("Enter new passphrase (empty for no " 591 "passphrase): ", RP_ALLOW_STDIN); 592 passphrase2 = read_passphrase("Enter same passphrase again: ", 593 RP_ALLOW_STDIN); 594 595 /* Verify that they are the same. */ 596 if (strcmp(passphrase1, passphrase2) != 0) { 597 memset(passphrase1, 0, strlen(passphrase1)); 598 memset(passphrase2, 0, strlen(passphrase2)); 599 xfree(passphrase1); 600 xfree(passphrase2); 601 printf("Pass phrases do not match. Try again.\n"); 602 exit(1); 603 } 604 /* Destroy the other copy. */ 605 memset(passphrase2, 0, strlen(passphrase2)); 606 xfree(passphrase2); 607 } 608 609 /* Save the file using the new passphrase. */ 610 if (!key_save_private(private, identity_file, passphrase1, comment)) { 611 printf("Saving the key failed: %s.\n", identity_file); 612 memset(passphrase1, 0, strlen(passphrase1)); 613 xfree(passphrase1); 614 key_free(private); 615 xfree(comment); 616 exit(1); 617 } 618 /* Destroy the passphrase and the copy of the key in memory. */ 619 memset(passphrase1, 0, strlen(passphrase1)); 620 xfree(passphrase1); 621 key_free(private); /* Destroys contents */ 622 xfree(comment); 623 624 printf("Your identification has been saved with the new passphrase.\n"); 625 exit(0); 626 } 627 628 #ifdef DNS 629 /* 630 * Print the SSHFP RR. 631 */ 632 static void 633 do_print_resource_record(struct passwd *pw, char *hostname) 634 { 635 Key *public; 636 char *comment = NULL; 637 struct stat st; 638 639 if (!have_identity) 640 ask_filename(pw, "Enter file in which the key is"); 641 if (stat(identity_file, &st) < 0) { 642 perror(identity_file); 643 exit(1); 644 } 645 public = key_load_public(identity_file, &comment); 646 if (public != NULL) { 647 export_dns_rr(hostname, public, stdout, print_generic); 648 key_free(public); 649 xfree(comment); 650 exit(0); 651 } 652 if (comment) 653 xfree(comment); 654 655 printf("failed to read v2 public key from %s.\n", identity_file); 656 exit(1); 657 } 658 #endif /* DNS */ 659 660 /* 661 * Change the comment of a private key file. 662 */ 663 static void 664 do_change_comment(struct passwd *pw) 665 { 666 char new_comment[1024], *comment, *passphrase; 667 Key *private; 668 Key *public; 669 struct stat st; 670 FILE *f; 671 int fd; 672 673 if (!have_identity) 674 ask_filename(pw, "Enter file in which the key is"); 675 if (stat(identity_file, &st) < 0) { 676 perror(identity_file); 677 exit(1); 678 } 679 private = key_load_private(identity_file, "", &comment); 680 if (private == NULL) { 681 if (identity_passphrase) 682 passphrase = xstrdup(identity_passphrase); 683 else if (identity_new_passphrase) 684 passphrase = xstrdup(identity_new_passphrase); 685 else 686 passphrase = read_passphrase("Enter passphrase: ", 687 RP_ALLOW_STDIN); 688 /* Try to load using the passphrase. */ 689 private = key_load_private(identity_file, passphrase, &comment); 690 if (private == NULL) { 691 memset(passphrase, 0, strlen(passphrase)); 692 xfree(passphrase); 693 printf("Bad passphrase.\n"); 694 exit(1); 695 } 696 } else { 697 passphrase = xstrdup(""); 698 } 699 if (private->type != KEY_RSA1) { 700 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 701 key_free(private); 702 exit(1); 703 } 704 printf("Key now has comment '%s'\n", comment); 705 706 if (identity_comment) { 707 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 708 } else { 709 printf("Enter new comment: "); 710 fflush(stdout); 711 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 712 memset(passphrase, 0, strlen(passphrase)); 713 key_free(private); 714 exit(1); 715 } 716 if (strchr(new_comment, '\n')) 717 *strchr(new_comment, '\n') = 0; 718 } 719 720 /* Save the file using the new passphrase. */ 721 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 722 printf("Saving the key failed: %s.\n", identity_file); 723 memset(passphrase, 0, strlen(passphrase)); 724 xfree(passphrase); 725 key_free(private); 726 xfree(comment); 727 exit(1); 728 } 729 memset(passphrase, 0, strlen(passphrase)); 730 xfree(passphrase); 731 public = key_from_private(private); 732 key_free(private); 733 734 strlcat(identity_file, ".pub", sizeof(identity_file)); 735 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 736 if (fd == -1) { 737 printf("Could not save your public key in %s\n", identity_file); 738 exit(1); 739 } 740 f = fdopen(fd, "w"); 741 if (f == NULL) { 742 printf("fdopen %s failed", identity_file); 743 exit(1); 744 } 745 if (!key_write(public, f)) 746 fprintf(stderr, "write key failed"); 747 key_free(public); 748 fprintf(f, " %s\n", new_comment); 749 fclose(f); 750 751 xfree(comment); 752 753 printf("The comment in your key file has been changed.\n"); 754 exit(0); 755 } 756 757 static void 758 usage(void) 759 { 760 fprintf(stderr, "Usage: %s [options]\n", __progname); 761 fprintf(stderr, "Options:\n"); 762 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 763 fprintf(stderr, " -c Change comment in private and public key files.\n"); 764 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); 765 fprintf(stderr, " -f filename Filename of the key file.\n"); 766 fprintf(stderr, " -g Use generic DNS resource record format.\n"); 767 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); 768 fprintf(stderr, " -l Show fingerprint of key file.\n"); 769 fprintf(stderr, " -p Change passphrase of private key file.\n"); 770 fprintf(stderr, " -q Quiet.\n"); 771 fprintf(stderr, " -y Read private key file and print public key.\n"); 772 fprintf(stderr, " -t type Specify type of key to create.\n"); 773 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 774 fprintf(stderr, " -C comment Provide new comment.\n"); 775 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 776 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 777 #ifdef DNS 778 fprintf(stderr, " -r hostname Print DNS resource record.\n"); 779 #endif /* DNS */ 780 #ifdef SMARTCARD 781 fprintf(stderr, " -D reader Download public key from smartcard.\n"); 782 fprintf(stderr, " -U reader Upload private key to smartcard.\n"); 783 #endif /* SMARTCARD */ 784 785 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli\n"); 786 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli\n"); 787 788 exit(1); 789 } 790 791 /* 792 * Main program for key management. 793 */ 794 int 795 main(int ac, char **av) 796 { 797 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 798 char out_file[MAXPATHLEN], *reader_id = NULL; 799 char *resource_record_hostname = NULL; 800 Key *private, *public; 801 struct passwd *pw; 802 struct stat st; 803 int opt, type, fd, download = 0, memory = 0; 804 int generator_wanted = 0, trials = 100; 805 int do_gen_candidates = 0, do_screen_candidates = 0; 806 BIGNUM *start = NULL; 807 FILE *f; 808 809 extern int optind; 810 extern char *optarg; 811 812 __progname = ssh_get_progname(av[0]); 813 814 SSLeay_add_all_algorithms(); 815 log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 816 817 init_rng(); 818 seed_rng(); 819 820 /* we need this for the home * directory. */ 821 pw = getpwuid(getuid()); 822 if (!pw) { 823 printf("You don't exist, go away!\n"); 824 exit(1); 825 } 826 if (gethostname(hostname, sizeof(hostname)) < 0) { 827 perror("gethostname"); 828 exit(1); 829 } 830 831 while ((opt = getopt(ac, av, 832 "degiqpclBRxXyb:f:t:U:D:P:N:C:r:g:T:G:M:S:a:W:")) != -1) { 833 switch (opt) { 834 case 'b': 835 bits = atoi(optarg); 836 if (bits < 512 || bits > 32768) { 837 printf("Bits has bad value.\n"); 838 exit(1); 839 } 840 break; 841 case 'l': 842 print_fingerprint = 1; 843 break; 844 case 'B': 845 print_bubblebabble = 1; 846 break; 847 case 'p': 848 change_passphrase = 1; 849 break; 850 case 'c': 851 change_comment = 1; 852 break; 853 case 'f': 854 strlcpy(identity_file, optarg, sizeof(identity_file)); 855 have_identity = 1; 856 break; 857 case 'g': 858 print_generic = 1; 859 break; 860 case 'P': 861 identity_passphrase = optarg; 862 break; 863 case 'N': 864 identity_new_passphrase = optarg; 865 break; 866 case 'C': 867 identity_comment = optarg; 868 break; 869 case 'q': 870 quiet = 1; 871 break; 872 case 'R': 873 /* unused */ 874 exit(0); 875 break; 876 case 'e': 877 case 'x': 878 /* export key */ 879 convert_to_ssh2 = 1; 880 break; 881 case 'i': 882 case 'X': 883 /* import key */ 884 convert_from_ssh2 = 1; 885 break; 886 case 'y': 887 print_public = 1; 888 break; 889 case 'd': 890 key_type_name = "dsa"; 891 break; 892 case 't': 893 key_type_name = optarg; 894 break; 895 case 'D': 896 download = 1; 897 case 'U': 898 reader_id = optarg; 899 break; 900 case 'r': 901 resource_record_hostname = optarg; 902 break; 903 case 'W': 904 generator_wanted = atoi(optarg); 905 if (generator_wanted < 1) 906 fatal("Desired generator has bad value."); 907 break; 908 case 'a': 909 trials = atoi(optarg); 910 if (trials < TRIAL_MINIMUM) { 911 fatal("Minimum primality trials is %d", 912 TRIAL_MINIMUM); 913 } 914 break; 915 case 'M': 916 memory = atoi(optarg); 917 if (memory != 0 && 918 (memory < LARGE_MINIMUM || memory > LARGE_MAXIMUM)) { 919 fatal("Invalid memory amount (min %ld, max %ld)", 920 LARGE_MINIMUM, LARGE_MAXIMUM); 921 } 922 break; 923 case 'G': 924 do_gen_candidates = 1; 925 strlcpy(out_file, optarg, sizeof(out_file)); 926 break; 927 case 'T': 928 do_screen_candidates = 1; 929 strlcpy(out_file, optarg, sizeof(out_file)); 930 break; 931 case 'S': 932 /* XXX - also compare length against bits */ 933 if (BN_hex2bn(&start, optarg) == 0) 934 fatal("Invalid start point."); 935 break; 936 case '?': 937 default: 938 usage(); 939 } 940 } 941 if (optind < ac) { 942 printf("Too many arguments.\n"); 943 usage(); 944 } 945 if (change_passphrase && change_comment) { 946 printf("Can only have one of -p and -c.\n"); 947 usage(); 948 } 949 if (print_fingerprint || print_bubblebabble) 950 do_fingerprint(pw); 951 if (change_passphrase) 952 do_change_passphrase(pw); 953 if (change_comment) 954 do_change_comment(pw); 955 if (convert_to_ssh2) 956 do_convert_to_ssh2(pw); 957 if (convert_from_ssh2) 958 do_convert_from_ssh2(pw); 959 if (print_public) 960 do_print_public(pw); 961 if (resource_record_hostname != NULL) { 962 #ifdef DNS 963 do_print_resource_record(pw, resource_record_hostname); 964 #else /* DNS */ 965 fatal("no DNS support."); 966 #endif /* DNS */ 967 } 968 if (reader_id != NULL) { 969 #ifdef SMARTCARD 970 if (download) 971 do_download(pw, reader_id); 972 else 973 do_upload(pw, reader_id); 974 #else /* SMARTCARD */ 975 fatal("no support for smartcards."); 976 #endif /* SMARTCARD */ 977 } 978 979 if (do_gen_candidates) { 980 FILE *out = fopen(out_file, "w"); 981 982 if (out == NULL) { 983 error("Couldn't open modulus candidate file \"%s\": %s", 984 out_file, strerror(errno)); 985 return (1); 986 } 987 if (gen_candidates(out, memory, bits, start) != 0) 988 fatal("modulus candidate generation failed\n"); 989 990 return (0); 991 } 992 993 if (do_screen_candidates) { 994 FILE *in; 995 FILE *out = fopen(out_file, "w"); 996 997 if (have_identity && strcmp(identity_file, "-") != 0) { 998 if ((in = fopen(identity_file, "r")) == NULL) { 999 fatal("Couldn't open modulus candidate " 1000 "file \"%s\": %s", identity_file, 1001 strerror(errno)); 1002 } 1003 } else 1004 in = stdin; 1005 1006 if (out == NULL) { 1007 fatal("Couldn't open moduli file \"%s\": %s", 1008 out_file, strerror(errno)); 1009 } 1010 if (prime_test(in, out, trials, generator_wanted) != 0) 1011 fatal("modulus screening failed\n"); 1012 return (0); 1013 } 1014 1015 arc4random_stir(); 1016 1017 if (key_type_name == NULL) { 1018 printf("You must specify a key type (-t).\n"); 1019 usage(); 1020 } 1021 type = key_type_from_name(key_type_name); 1022 if (type == KEY_UNSPEC) { 1023 fprintf(stderr, "unknown key type %s\n", key_type_name); 1024 exit(1); 1025 } 1026 if (!quiet) 1027 printf("Generating public/private %s key pair.\n", key_type_name); 1028 private = key_generate(type, bits); 1029 if (private == NULL) { 1030 fprintf(stderr, "key_generate failed"); 1031 exit(1); 1032 } 1033 public = key_from_private(private); 1034 1035 if (!have_identity) 1036 ask_filename(pw, "Enter file in which to save the key"); 1037 1038 /* Create ~/.ssh directory if it doesn\'t already exist. */ 1039 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); 1040 if (strstr(identity_file, dotsshdir) != NULL && 1041 stat(dotsshdir, &st) < 0) { 1042 if (mkdir(dotsshdir, 0700) < 0) 1043 error("Could not create directory '%s'.", dotsshdir); 1044 else if (!quiet) 1045 printf("Created directory '%s'.\n", dotsshdir); 1046 } 1047 /* If the file already exists, ask the user to confirm. */ 1048 if (stat(identity_file, &st) >= 0) { 1049 char yesno[3]; 1050 printf("%s already exists.\n", identity_file); 1051 printf("Overwrite (y/n)? "); 1052 fflush(stdout); 1053 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 1054 exit(1); 1055 if (yesno[0] != 'y' && yesno[0] != 'Y') 1056 exit(1); 1057 } 1058 /* Ask for a passphrase (twice). */ 1059 if (identity_passphrase) 1060 passphrase1 = xstrdup(identity_passphrase); 1061 else if (identity_new_passphrase) 1062 passphrase1 = xstrdup(identity_new_passphrase); 1063 else { 1064 passphrase_again: 1065 passphrase1 = 1066 read_passphrase("Enter passphrase (empty for no " 1067 "passphrase): ", RP_ALLOW_STDIN); 1068 passphrase2 = read_passphrase("Enter same passphrase again: ", 1069 RP_ALLOW_STDIN); 1070 if (strcmp(passphrase1, passphrase2) != 0) { 1071 /* 1072 * The passphrases do not match. Clear them and 1073 * retry. 1074 */ 1075 memset(passphrase1, 0, strlen(passphrase1)); 1076 memset(passphrase2, 0, strlen(passphrase2)); 1077 xfree(passphrase1); 1078 xfree(passphrase2); 1079 printf("Passphrases do not match. Try again.\n"); 1080 goto passphrase_again; 1081 } 1082 /* Clear the other copy of the passphrase. */ 1083 memset(passphrase2, 0, strlen(passphrase2)); 1084 xfree(passphrase2); 1085 } 1086 1087 if (identity_comment) { 1088 strlcpy(comment, identity_comment, sizeof(comment)); 1089 } else { 1090 /* Create default commend field for the passphrase. */ 1091 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 1092 } 1093 1094 /* Save the key with the given passphrase and comment. */ 1095 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1096 printf("Saving the key failed: %s.\n", identity_file); 1097 memset(passphrase1, 0, strlen(passphrase1)); 1098 xfree(passphrase1); 1099 exit(1); 1100 } 1101 /* Clear the passphrase. */ 1102 memset(passphrase1, 0, strlen(passphrase1)); 1103 xfree(passphrase1); 1104 1105 /* Clear the private key and the random number generator. */ 1106 key_free(private); 1107 arc4random_stir(); 1108 1109 if (!quiet) 1110 printf("Your identification has been saved in %s.\n", identity_file); 1111 1112 strlcat(identity_file, ".pub", sizeof(identity_file)); 1113 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1114 if (fd == -1) { 1115 printf("Could not save your public key in %s\n", identity_file); 1116 exit(1); 1117 } 1118 f = fdopen(fd, "w"); 1119 if (f == NULL) { 1120 printf("fdopen %s failed", identity_file); 1121 exit(1); 1122 } 1123 if (!key_write(public, f)) 1124 fprintf(stderr, "write key failed"); 1125 fprintf(f, " %s\n", comment); 1126 fclose(f); 1127 1128 if (!quiet) { 1129 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 1130 printf("Your public key has been saved in %s.\n", 1131 identity_file); 1132 printf("The key fingerprint is:\n"); 1133 printf("%s %s\n", fp, comment); 1134 xfree(fp); 1135 } 1136 1137 key_free(public); 1138 exit(0); 1139 } 1140