1 /* $OpenBSD: ssh-keygen.c,v 1.197 2010/08/04 06:07:11 djm Exp $ */ 2 /* 3 * Author: Tatu Ylonen <ylo@cs.hut.fi> 4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * Identity and host key generation and maintenance. 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 */ 14 15 #include "includes.h" 16 17 #include <sys/types.h> 18 #include <sys/socket.h> 19 #include <sys/stat.h> 20 #include <sys/param.h> 21 22 #include <openssl/evp.h> 23 #include <openssl/pem.h> 24 #include "openbsd-compat/openssl-compat.h" 25 26 #include <errno.h> 27 #include <fcntl.h> 28 #include <netdb.h> 29 #ifdef HAVE_PATHS_H 30 # include <paths.h> 31 #endif 32 #include <pwd.h> 33 #include <stdarg.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 39 #include "xmalloc.h" 40 #include "key.h" 41 #include "rsa.h" 42 #include "authfile.h" 43 #include "uuencode.h" 44 #include "buffer.h" 45 #include "pathnames.h" 46 #include "log.h" 47 #include "misc.h" 48 #include "match.h" 49 #include "hostfile.h" 50 #include "dns.h" 51 #include "ssh2.h" 52 53 #ifdef ENABLE_PKCS11 54 #include "ssh-pkcs11.h" 55 #endif 56 57 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */ 58 #define DEFAULT_BITS 2048 59 #define DEFAULT_BITS_DSA 1024 60 u_int32_t bits = 0; 61 62 /* 63 * Flag indicating that we just want to change the passphrase. This can be 64 * set on the command line. 65 */ 66 int change_passphrase = 0; 67 68 /* 69 * Flag indicating that we just want to change the comment. This can be set 70 * on the command line. 71 */ 72 int change_comment = 0; 73 74 int quiet = 0; 75 76 int log_level = SYSLOG_LEVEL_INFO; 77 78 /* Flag indicating that we want to hash a known_hosts file */ 79 int hash_hosts = 0; 80 /* Flag indicating that we want lookup a host in known_hosts file */ 81 int find_host = 0; 82 /* Flag indicating that we want to delete a host from a known_hosts file */ 83 int delete_host = 0; 84 85 /* Flag indicating that we want to show the contents of a certificate */ 86 int show_cert = 0; 87 88 /* Flag indicating that we just want to see the key fingerprint */ 89 int print_fingerprint = 0; 90 int print_bubblebabble = 0; 91 92 /* The identity file name, given on the command line or entered by the user. */ 93 char identity_file[1024]; 94 int have_identity = 0; 95 96 /* This is set to the passphrase if given on the command line. */ 97 char *identity_passphrase = NULL; 98 99 /* This is set to the new passphrase if given on the command line. */ 100 char *identity_new_passphrase = NULL; 101 102 /* This is set to the new comment if given on the command line. */ 103 char *identity_comment = NULL; 104 105 /* Path to CA key when certifying keys. */ 106 char *ca_key_path = NULL; 107 108 /* Certificate serial number */ 109 long long cert_serial = 0; 110 111 /* Key type when certifying */ 112 u_int cert_key_type = SSH2_CERT_TYPE_USER; 113 114 /* "key ID" of signed key */ 115 char *cert_key_id = NULL; 116 117 /* Comma-separated list of principal names for certifying keys */ 118 char *cert_principals = NULL; 119 120 /* Validity period for certificates */ 121 u_int64_t cert_valid_from = 0; 122 u_int64_t cert_valid_to = ~0ULL; 123 124 /* Certificate options */ 125 #define CERTOPT_X_FWD (1) 126 #define CERTOPT_AGENT_FWD (1<<1) 127 #define CERTOPT_PORT_FWD (1<<2) 128 #define CERTOPT_PTY (1<<3) 129 #define CERTOPT_USER_RC (1<<4) 130 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 131 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 132 u_int32_t certflags_flags = CERTOPT_DEFAULT; 133 char *certflags_command = NULL; 134 char *certflags_src_addr = NULL; 135 136 /* Conversion to/from various formats */ 137 int convert_to = 0; 138 int convert_from = 0; 139 enum { 140 FMT_RFC4716, 141 FMT_PKCS8, 142 FMT_PEM 143 } convert_format = FMT_RFC4716; 144 int print_public = 0; 145 int print_generic = 0; 146 147 char *key_type_name = NULL; 148 149 /* Load key from this PKCS#11 provider */ 150 char *pkcs11provider = NULL; 151 152 /* argv0 */ 153 extern char *__progname; 154 155 char hostname[MAXHOSTNAMELEN]; 156 157 /* moduli.c */ 158 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 159 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t); 160 161 static void 162 ask_filename(struct passwd *pw, const char *prompt) 163 { 164 char buf[1024]; 165 char *name = NULL; 166 167 if (key_type_name == NULL) 168 name = _PATH_SSH_CLIENT_ID_RSA; 169 else { 170 switch (key_type_from_name(key_type_name)) { 171 case KEY_RSA1: 172 name = _PATH_SSH_CLIENT_IDENTITY; 173 break; 174 case KEY_DSA_CERT: 175 case KEY_DSA_CERT_V00: 176 case KEY_DSA: 177 name = _PATH_SSH_CLIENT_ID_DSA; 178 break; 179 case KEY_RSA_CERT: 180 case KEY_RSA_CERT_V00: 181 case KEY_RSA: 182 name = _PATH_SSH_CLIENT_ID_RSA; 183 break; 184 default: 185 fprintf(stderr, "bad key type\n"); 186 exit(1); 187 break; 188 } 189 } 190 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 191 fprintf(stderr, "%s (%s): ", prompt, identity_file); 192 if (fgets(buf, sizeof(buf), stdin) == NULL) 193 exit(1); 194 buf[strcspn(buf, "\n")] = '\0'; 195 if (strcmp(buf, "") != 0) 196 strlcpy(identity_file, buf, sizeof(identity_file)); 197 have_identity = 1; 198 } 199 200 static Key * 201 load_identity(char *filename) 202 { 203 char *pass; 204 Key *prv; 205 206 prv = key_load_private(filename, "", NULL); 207 if (prv == NULL) { 208 if (identity_passphrase) 209 pass = xstrdup(identity_passphrase); 210 else 211 pass = read_passphrase("Enter passphrase: ", 212 RP_ALLOW_STDIN); 213 prv = key_load_private(filename, pass, NULL); 214 memset(pass, 0, strlen(pass)); 215 xfree(pass); 216 } 217 return prv; 218 } 219 220 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 221 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 222 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 223 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 224 225 static void 226 do_convert_to_ssh2(struct passwd *pw, Key *k) 227 { 228 u_int len; 229 u_char *blob; 230 char comment[61]; 231 232 if (key_to_blob(k, &blob, &len) <= 0) { 233 fprintf(stderr, "key_to_blob failed\n"); 234 exit(1); 235 } 236 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 237 snprintf(comment, sizeof(comment), 238 "%u-bit %s, converted by %s@%s from OpenSSH", 239 key_size(k), key_type(k), 240 pw->pw_name, hostname); 241 242 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 243 fprintf(stdout, "Comment: \"%s\"\n", comment); 244 dump_base64(stdout, blob, len); 245 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 246 key_free(k); 247 xfree(blob); 248 exit(0); 249 } 250 251 static void 252 do_convert_to_pkcs8(Key *k) 253 { 254 switch (key_type_plain(k->type)) { 255 case KEY_RSA: 256 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 257 fatal("PEM_write_RSA_PUBKEY failed"); 258 break; 259 case KEY_DSA: 260 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 261 fatal("PEM_write_DSA_PUBKEY failed"); 262 break; 263 default: 264 fatal("%s: unsupported key type %s", __func__, key_type(k)); 265 } 266 exit(0); 267 } 268 269 static void 270 do_convert_to_pem(Key *k) 271 { 272 switch (key_type_plain(k->type)) { 273 case KEY_RSA: 274 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 275 fatal("PEM_write_RSAPublicKey failed"); 276 break; 277 #if notyet /* OpenSSH 0.9.8 lacks this function */ 278 case KEY_DSA: 279 if (!PEM_write_DSAPublicKey(stdout, k->dsa)) 280 fatal("PEM_write_DSAPublicKey failed"); 281 break; 282 #endif 283 default: 284 fatal("%s: unsupported key type %s", __func__, key_type(k)); 285 } 286 exit(0); 287 } 288 289 static void 290 do_convert_to(struct passwd *pw) 291 { 292 Key *k; 293 struct stat st; 294 295 if (!have_identity) 296 ask_filename(pw, "Enter file in which the key is"); 297 if (stat(identity_file, &st) < 0) 298 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 299 if ((k = key_load_public(identity_file, NULL)) == NULL) { 300 if ((k = load_identity(identity_file)) == NULL) { 301 fprintf(stderr, "load failed\n"); 302 exit(1); 303 } 304 } 305 if (k->type == KEY_RSA1) { 306 fprintf(stderr, "version 1 keys are not supported\n"); 307 exit(1); 308 } 309 310 switch (convert_format) { 311 case FMT_RFC4716: 312 do_convert_to_ssh2(pw, k); 313 break; 314 case FMT_PKCS8: 315 do_convert_to_pkcs8(k); 316 break; 317 case FMT_PEM: 318 do_convert_to_pem(k); 319 break; 320 default: 321 fatal("%s: unknown key format %d", __func__, convert_format); 322 } 323 exit(0); 324 } 325 326 static void 327 buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 328 { 329 u_int bignum_bits = buffer_get_int(b); 330 u_int bytes = (bignum_bits + 7) / 8; 331 332 if (buffer_len(b) < bytes) 333 fatal("buffer_get_bignum_bits: input buffer too small: " 334 "need %d have %d", bytes, buffer_len(b)); 335 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL) 336 fatal("buffer_get_bignum_bits: BN_bin2bn failed"); 337 buffer_consume(b, bytes); 338 } 339 340 static Key * 341 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 342 { 343 Buffer b; 344 Key *key = NULL; 345 char *type, *cipher; 346 u_char *sig, data[] = "abcde12345"; 347 int magic, rlen, ktype, i1, i2, i3, i4; 348 u_int slen; 349 u_long e; 350 351 buffer_init(&b); 352 buffer_append(&b, blob, blen); 353 354 magic = buffer_get_int(&b); 355 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 356 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 357 buffer_free(&b); 358 return NULL; 359 } 360 i1 = buffer_get_int(&b); 361 type = buffer_get_string(&b, NULL); 362 cipher = buffer_get_string(&b, NULL); 363 i2 = buffer_get_int(&b); 364 i3 = buffer_get_int(&b); 365 i4 = buffer_get_int(&b); 366 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 367 if (strcmp(cipher, "none") != 0) { 368 error("unsupported cipher %s", cipher); 369 xfree(cipher); 370 buffer_free(&b); 371 xfree(type); 372 return NULL; 373 } 374 xfree(cipher); 375 376 if (strstr(type, "dsa")) { 377 ktype = KEY_DSA; 378 } else if (strstr(type, "rsa")) { 379 ktype = KEY_RSA; 380 } else { 381 buffer_free(&b); 382 xfree(type); 383 return NULL; 384 } 385 key = key_new_private(ktype); 386 xfree(type); 387 388 switch (key->type) { 389 case KEY_DSA: 390 buffer_get_bignum_bits(&b, key->dsa->p); 391 buffer_get_bignum_bits(&b, key->dsa->g); 392 buffer_get_bignum_bits(&b, key->dsa->q); 393 buffer_get_bignum_bits(&b, key->dsa->pub_key); 394 buffer_get_bignum_bits(&b, key->dsa->priv_key); 395 break; 396 case KEY_RSA: 397 e = buffer_get_char(&b); 398 debug("e %lx", e); 399 if (e < 30) { 400 e <<= 8; 401 e += buffer_get_char(&b); 402 debug("e %lx", e); 403 e <<= 8; 404 e += buffer_get_char(&b); 405 debug("e %lx", e); 406 } 407 if (!BN_set_word(key->rsa->e, e)) { 408 buffer_free(&b); 409 key_free(key); 410 return NULL; 411 } 412 buffer_get_bignum_bits(&b, key->rsa->d); 413 buffer_get_bignum_bits(&b, key->rsa->n); 414 buffer_get_bignum_bits(&b, key->rsa->iqmp); 415 buffer_get_bignum_bits(&b, key->rsa->q); 416 buffer_get_bignum_bits(&b, key->rsa->p); 417 rsa_generate_additional_parameters(key->rsa); 418 break; 419 } 420 rlen = buffer_len(&b); 421 if (rlen != 0) 422 error("do_convert_private_ssh2_from_blob: " 423 "remaining bytes in key blob %d", rlen); 424 buffer_free(&b); 425 426 /* try the key */ 427 key_sign(key, &sig, &slen, data, sizeof(data)); 428 key_verify(key, sig, slen, data, sizeof(data)); 429 xfree(sig); 430 return key; 431 } 432 433 static int 434 get_line(FILE *fp, char *line, size_t len) 435 { 436 int c; 437 size_t pos = 0; 438 439 line[0] = '\0'; 440 while ((c = fgetc(fp)) != EOF) { 441 if (pos >= len - 1) { 442 fprintf(stderr, "input line too long.\n"); 443 exit(1); 444 } 445 switch (c) { 446 case '\r': 447 c = fgetc(fp); 448 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { 449 fprintf(stderr, "unget: %s\n", strerror(errno)); 450 exit(1); 451 } 452 return pos; 453 case '\n': 454 return pos; 455 } 456 line[pos++] = c; 457 line[pos] = '\0'; 458 } 459 /* We reached EOF */ 460 return -1; 461 } 462 463 static void 464 do_convert_from_ssh2(struct passwd *pw, Key **k, int *private) 465 { 466 int blen; 467 u_int len; 468 char line[1024]; 469 u_char blob[8096]; 470 char encoded[8096]; 471 int escaped = 0; 472 FILE *fp; 473 474 if ((fp = fopen(identity_file, "r")) == NULL) 475 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 476 encoded[0] = '\0'; 477 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 478 if (line[blen - 1] == '\\') 479 escaped++; 480 if (strncmp(line, "----", 4) == 0 || 481 strstr(line, ": ") != NULL) { 482 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 483 *private = 1; 484 if (strstr(line, " END ") != NULL) { 485 break; 486 } 487 /* fprintf(stderr, "ignore: %s", line); */ 488 continue; 489 } 490 if (escaped) { 491 escaped--; 492 /* fprintf(stderr, "escaped: %s", line); */ 493 continue; 494 } 495 strlcat(encoded, line, sizeof(encoded)); 496 } 497 len = strlen(encoded); 498 if (((len % 4) == 3) && 499 (encoded[len-1] == '=') && 500 (encoded[len-2] == '=') && 501 (encoded[len-3] == '=')) 502 encoded[len-3] = '\0'; 503 blen = uudecode(encoded, blob, sizeof(blob)); 504 if (blen < 0) { 505 fprintf(stderr, "uudecode failed.\n"); 506 exit(1); 507 } 508 *k = *private ? 509 do_convert_private_ssh2_from_blob(blob, blen) : 510 key_from_blob(blob, blen); 511 if (*k == NULL) { 512 fprintf(stderr, "decode blob failed.\n"); 513 exit(1); 514 } 515 fclose(fp); 516 } 517 518 static void 519 do_convert_from_pkcs8(Key **k, int *private) 520 { 521 EVP_PKEY *pubkey; 522 FILE *fp; 523 524 if ((fp = fopen(identity_file, "r")) == NULL) 525 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 526 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 527 fatal("%s: %s is not a recognised public key format", __func__, 528 identity_file); 529 } 530 fclose(fp); 531 switch (EVP_PKEY_type(pubkey->type)) { 532 case EVP_PKEY_RSA: 533 *k = key_new(KEY_UNSPEC); 534 (*k)->type = KEY_RSA; 535 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 536 break; 537 case EVP_PKEY_DSA: 538 *k = key_new(KEY_UNSPEC); 539 (*k)->type = KEY_DSA; 540 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 541 break; 542 default: 543 fatal("%s: unsupported pubkey type %d", __func__, 544 EVP_PKEY_type(pubkey->type)); 545 } 546 EVP_PKEY_free(pubkey); 547 return; 548 } 549 550 static void 551 do_convert_from_pem(Key **k, int *private) 552 { 553 FILE *fp; 554 RSA *rsa; 555 #ifdef notyet 556 DSA *dsa; 557 #endif 558 559 if ((fp = fopen(identity_file, "r")) == NULL) 560 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 561 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 562 *k = key_new(KEY_UNSPEC); 563 (*k)->type = KEY_RSA; 564 (*k)->rsa = rsa; 565 fclose(fp); 566 return; 567 } 568 #if notyet /* OpenSSH 0.9.8 lacks this function */ 569 rewind(fp); 570 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 571 *k = key_new(KEY_UNSPEC); 572 (*k)->type = KEY_DSA; 573 (*k)->dsa = dsa; 574 fclose(fp); 575 return; 576 } 577 #endif 578 fatal("%s: unrecognised raw private key format", __func__); 579 } 580 581 static void 582 do_convert_from(struct passwd *pw) 583 { 584 Key *k = NULL; 585 int private = 0, ok = 0; 586 struct stat st; 587 588 if (!have_identity) 589 ask_filename(pw, "Enter file in which the key is"); 590 if (stat(identity_file, &st) < 0) 591 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 592 593 switch (convert_format) { 594 case FMT_RFC4716: 595 do_convert_from_ssh2(pw, &k, &private); 596 break; 597 case FMT_PKCS8: 598 do_convert_from_pkcs8(&k, &private); 599 break; 600 case FMT_PEM: 601 do_convert_from_pem(&k, &private); 602 break; 603 default: 604 fatal("%s: unknown key format %d", __func__, convert_format); 605 } 606 607 if (!private) 608 ok = key_write(k, stdout); 609 if (ok) 610 fprintf(stdout, "\n"); 611 else { 612 switch (k->type) { 613 case KEY_DSA: 614 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 615 NULL, 0, NULL, NULL); 616 break; 617 case KEY_RSA: 618 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 619 NULL, 0, NULL, NULL); 620 break; 621 default: 622 fatal("%s: unsupported key type %s", __func__, 623 key_type(k)); 624 } 625 } 626 627 if (!ok) { 628 fprintf(stderr, "key write failed\n"); 629 exit(1); 630 } 631 key_free(k); 632 exit(0); 633 } 634 635 static void 636 do_print_public(struct passwd *pw) 637 { 638 Key *prv; 639 struct stat st; 640 641 if (!have_identity) 642 ask_filename(pw, "Enter file in which the key is"); 643 if (stat(identity_file, &st) < 0) { 644 perror(identity_file); 645 exit(1); 646 } 647 prv = load_identity(identity_file); 648 if (prv == NULL) { 649 fprintf(stderr, "load failed\n"); 650 exit(1); 651 } 652 if (!key_write(prv, stdout)) 653 fprintf(stderr, "key_write failed"); 654 key_free(prv); 655 fprintf(stdout, "\n"); 656 exit(0); 657 } 658 659 static void 660 do_download(struct passwd *pw) 661 { 662 #ifdef ENABLE_PKCS11 663 Key **keys = NULL; 664 int i, nkeys; 665 666 pkcs11_init(0); 667 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 668 if (nkeys <= 0) 669 fatal("cannot read public key from pkcs11"); 670 for (i = 0; i < nkeys; i++) { 671 key_write(keys[i], stdout); 672 key_free(keys[i]); 673 fprintf(stdout, "\n"); 674 } 675 xfree(keys); 676 pkcs11_terminate(); 677 exit(0); 678 #else 679 fatal("no pkcs11 support"); 680 #endif /* ENABLE_PKCS11 */ 681 } 682 683 static void 684 do_fingerprint(struct passwd *pw) 685 { 686 FILE *f; 687 Key *public; 688 char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra; 689 int i, skip = 0, num = 0, invalid = 1; 690 enum fp_rep rep; 691 enum fp_type fptype; 692 struct stat st; 693 694 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 695 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 696 697 if (!have_identity) 698 ask_filename(pw, "Enter file in which the key is"); 699 if (stat(identity_file, &st) < 0) { 700 perror(identity_file); 701 exit(1); 702 } 703 public = key_load_public(identity_file, &comment); 704 if (public != NULL) { 705 fp = key_fingerprint(public, fptype, rep); 706 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 707 printf("%u %s %s (%s)\n", key_size(public), fp, comment, 708 key_type(public)); 709 if (log_level >= SYSLOG_LEVEL_VERBOSE) 710 printf("%s\n", ra); 711 key_free(public); 712 xfree(comment); 713 xfree(ra); 714 xfree(fp); 715 exit(0); 716 } 717 if (comment) { 718 xfree(comment); 719 comment = NULL; 720 } 721 722 if ((f = fopen(identity_file, "r")) == NULL) 723 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 724 725 while (fgets(line, sizeof(line), f)) { 726 if ((cp = strchr(line, '\n')) == NULL) { 727 error("line %d too long: %.40s...", 728 num + 1, line); 729 skip = 1; 730 continue; 731 } 732 num++; 733 if (skip) { 734 skip = 0; 735 continue; 736 } 737 *cp = '\0'; 738 739 /* Skip leading whitespace, empty and comment lines. */ 740 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 741 ; 742 if (!*cp || *cp == '\n' || *cp == '#') 743 continue; 744 i = strtol(cp, &ep, 10); 745 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 746 int quoted = 0; 747 comment = cp; 748 for (; *cp && (quoted || (*cp != ' ' && 749 *cp != '\t')); cp++) { 750 if (*cp == '\\' && cp[1] == '"') 751 cp++; /* Skip both */ 752 else if (*cp == '"') 753 quoted = !quoted; 754 } 755 if (!*cp) 756 continue; 757 *cp++ = '\0'; 758 } 759 ep = cp; 760 public = key_new(KEY_RSA1); 761 if (key_read(public, &cp) != 1) { 762 cp = ep; 763 key_free(public); 764 public = key_new(KEY_UNSPEC); 765 if (key_read(public, &cp) != 1) { 766 key_free(public); 767 continue; 768 } 769 } 770 comment = *cp ? cp : comment; 771 fp = key_fingerprint(public, fptype, rep); 772 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 773 printf("%u %s %s (%s)\n", key_size(public), fp, 774 comment ? comment : "no comment", key_type(public)); 775 if (log_level >= SYSLOG_LEVEL_VERBOSE) 776 printf("%s\n", ra); 777 xfree(ra); 778 xfree(fp); 779 key_free(public); 780 invalid = 0; 781 } 782 fclose(f); 783 784 if (invalid) { 785 printf("%s is not a public key file.\n", identity_file); 786 exit(1); 787 } 788 exit(0); 789 } 790 791 static void 792 printhost(FILE *f, const char *name, Key *public, int ca, int hash) 793 { 794 if (print_fingerprint) { 795 enum fp_rep rep; 796 enum fp_type fptype; 797 char *fp, *ra; 798 799 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 800 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 801 fp = key_fingerprint(public, fptype, rep); 802 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 803 printf("%u %s %s (%s)\n", key_size(public), fp, name, 804 key_type(public)); 805 if (log_level >= SYSLOG_LEVEL_VERBOSE) 806 printf("%s\n", ra); 807 xfree(ra); 808 xfree(fp); 809 } else { 810 if (hash && (name = host_hash(name, NULL, 0)) == NULL) 811 fatal("hash_host failed"); 812 fprintf(f, "%s%s%s ", ca ? CA_MARKER : "", ca ? " " : "", name); 813 if (!key_write(public, f)) 814 fatal("key_write failed"); 815 fprintf(f, "\n"); 816 } 817 } 818 819 static void 820 do_known_hosts(struct passwd *pw, const char *name) 821 { 822 FILE *in, *out = stdout; 823 Key *pub; 824 char *cp, *cp2, *kp, *kp2; 825 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; 826 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; 827 int ca; 828 829 if (!have_identity) { 830 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 831 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 832 sizeof(identity_file)) 833 fatal("Specified known hosts path too long"); 834 xfree(cp); 835 have_identity = 1; 836 } 837 if ((in = fopen(identity_file, "r")) == NULL) 838 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 839 840 /* 841 * Find hosts goes to stdout, hash and deletions happen in-place 842 * A corner case is ssh-keygen -HF foo, which should go to stdout 843 */ 844 if (!find_host && (hash_hosts || delete_host)) { 845 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 846 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 847 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 848 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 849 fatal("known_hosts path too long"); 850 umask(077); 851 if ((c = mkstemp(tmp)) == -1) 852 fatal("mkstemp: %s", strerror(errno)); 853 if ((out = fdopen(c, "w")) == NULL) { 854 c = errno; 855 unlink(tmp); 856 fatal("fdopen: %s", strerror(c)); 857 } 858 inplace = 1; 859 } 860 861 while (fgets(line, sizeof(line), in)) { 862 if ((cp = strchr(line, '\n')) == NULL) { 863 error("line %d too long: %.40s...", num + 1, line); 864 skip = 1; 865 invalid = 1; 866 continue; 867 } 868 num++; 869 if (skip) { 870 skip = 0; 871 continue; 872 } 873 *cp = '\0'; 874 875 /* Skip leading whitespace, empty and comment lines. */ 876 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 877 ; 878 if (!*cp || *cp == '\n' || *cp == '#') { 879 if (inplace) 880 fprintf(out, "%s\n", cp); 881 continue; 882 } 883 /* Check whether this is a CA key */ 884 if (strncasecmp(cp, CA_MARKER, sizeof(CA_MARKER) - 1) == 0 && 885 (cp[sizeof(CA_MARKER) - 1] == ' ' || 886 cp[sizeof(CA_MARKER) - 1] == '\t')) { 887 ca = 1; 888 cp += sizeof(CA_MARKER); 889 } else 890 ca = 0; 891 892 /* Find the end of the host name portion. */ 893 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) 894 ; 895 896 if (*kp == '\0' || *(kp + 1) == '\0') { 897 error("line %d missing key: %.40s...", 898 num, line); 899 invalid = 1; 900 continue; 901 } 902 *kp++ = '\0'; 903 kp2 = kp; 904 905 pub = key_new(KEY_RSA1); 906 if (key_read(pub, &kp) != 1) { 907 kp = kp2; 908 key_free(pub); 909 pub = key_new(KEY_UNSPEC); 910 if (key_read(pub, &kp) != 1) { 911 error("line %d invalid key: %.40s...", 912 num, line); 913 key_free(pub); 914 invalid = 1; 915 continue; 916 } 917 } 918 919 if (*cp == HASH_DELIM) { 920 if (find_host || delete_host) { 921 cp2 = host_hash(name, cp, strlen(cp)); 922 if (cp2 == NULL) { 923 error("line %d: invalid hashed " 924 "name: %.64s...", num, line); 925 invalid = 1; 926 continue; 927 } 928 c = (strcmp(cp2, cp) == 0); 929 if (find_host && c) { 930 printf("# Host %s found: " 931 "line %d type %s%s\n", name, 932 num, key_type(pub), 933 ca ? " (CA key)" : ""); 934 printhost(out, cp, pub, ca, 0); 935 } 936 if (delete_host && !c && !ca) 937 printhost(out, cp, pub, ca, 0); 938 } else if (hash_hosts) 939 printhost(out, cp, pub, ca, 0); 940 } else { 941 if (find_host || delete_host) { 942 c = (match_hostname(name, cp, 943 strlen(cp)) == 1); 944 if (find_host && c) { 945 printf("# Host %s found: " 946 "line %d type %s%s\n", name, 947 num, key_type(pub), 948 ca ? " (CA key)" : ""); 949 printhost(out, name, pub, 950 ca, hash_hosts && !ca); 951 } 952 if (delete_host && !c && !ca) 953 printhost(out, cp, pub, ca, 0); 954 } else if (hash_hosts) { 955 for (cp2 = strsep(&cp, ","); 956 cp2 != NULL && *cp2 != '\0'; 957 cp2 = strsep(&cp, ",")) { 958 if (ca) { 959 fprintf(stderr, "Warning: " 960 "ignoring CA key for host: " 961 "%.64s\n", cp2); 962 printhost(out, cp2, pub, ca, 0); 963 } else if (strcspn(cp2, "*?!") != 964 strlen(cp2)) { 965 fprintf(stderr, "Warning: " 966 "ignoring host name with " 967 "metacharacters: %.64s\n", 968 cp2); 969 printhost(out, cp2, pub, ca, 0); 970 } else 971 printhost(out, cp2, pub, ca, 1); 972 } 973 has_unhashed = 1; 974 } 975 } 976 key_free(pub); 977 } 978 fclose(in); 979 980 if (invalid) { 981 fprintf(stderr, "%s is not a valid known_hosts file.\n", 982 identity_file); 983 if (inplace) { 984 fprintf(stderr, "Not replacing existing known_hosts " 985 "file because of errors\n"); 986 fclose(out); 987 unlink(tmp); 988 } 989 exit(1); 990 } 991 992 if (inplace) { 993 fclose(out); 994 995 /* Backup existing file */ 996 if (unlink(old) == -1 && errno != ENOENT) 997 fatal("unlink %.100s: %s", old, strerror(errno)); 998 if (link(identity_file, old) == -1) 999 fatal("link %.100s to %.100s: %s", identity_file, old, 1000 strerror(errno)); 1001 /* Move new one into place */ 1002 if (rename(tmp, identity_file) == -1) { 1003 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1004 strerror(errno)); 1005 unlink(tmp); 1006 unlink(old); 1007 exit(1); 1008 } 1009 1010 fprintf(stderr, "%s updated.\n", identity_file); 1011 fprintf(stderr, "Original contents retained as %s\n", old); 1012 if (has_unhashed) { 1013 fprintf(stderr, "WARNING: %s contains unhashed " 1014 "entries\n", old); 1015 fprintf(stderr, "Delete this file to ensure privacy " 1016 "of hostnames\n"); 1017 } 1018 } 1019 1020 exit(0); 1021 } 1022 1023 /* 1024 * Perform changing a passphrase. The argument is the passwd structure 1025 * for the current user. 1026 */ 1027 static void 1028 do_change_passphrase(struct passwd *pw) 1029 { 1030 char *comment; 1031 char *old_passphrase, *passphrase1, *passphrase2; 1032 struct stat st; 1033 Key *private; 1034 1035 if (!have_identity) 1036 ask_filename(pw, "Enter file in which the key is"); 1037 if (stat(identity_file, &st) < 0) { 1038 perror(identity_file); 1039 exit(1); 1040 } 1041 /* Try to load the file with empty passphrase. */ 1042 private = key_load_private(identity_file, "", &comment); 1043 if (private == NULL) { 1044 if (identity_passphrase) 1045 old_passphrase = xstrdup(identity_passphrase); 1046 else 1047 old_passphrase = 1048 read_passphrase("Enter old passphrase: ", 1049 RP_ALLOW_STDIN); 1050 private = key_load_private(identity_file, old_passphrase, 1051 &comment); 1052 memset(old_passphrase, 0, strlen(old_passphrase)); 1053 xfree(old_passphrase); 1054 if (private == NULL) { 1055 printf("Bad passphrase.\n"); 1056 exit(1); 1057 } 1058 } 1059 printf("Key has comment '%s'\n", comment); 1060 1061 /* Ask the new passphrase (twice). */ 1062 if (identity_new_passphrase) { 1063 passphrase1 = xstrdup(identity_new_passphrase); 1064 passphrase2 = NULL; 1065 } else { 1066 passphrase1 = 1067 read_passphrase("Enter new passphrase (empty for no " 1068 "passphrase): ", RP_ALLOW_STDIN); 1069 passphrase2 = read_passphrase("Enter same passphrase again: ", 1070 RP_ALLOW_STDIN); 1071 1072 /* Verify that they are the same. */ 1073 if (strcmp(passphrase1, passphrase2) != 0) { 1074 memset(passphrase1, 0, strlen(passphrase1)); 1075 memset(passphrase2, 0, strlen(passphrase2)); 1076 xfree(passphrase1); 1077 xfree(passphrase2); 1078 printf("Pass phrases do not match. Try again.\n"); 1079 exit(1); 1080 } 1081 /* Destroy the other copy. */ 1082 memset(passphrase2, 0, strlen(passphrase2)); 1083 xfree(passphrase2); 1084 } 1085 1086 /* Save the file using the new passphrase. */ 1087 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1088 printf("Saving the key failed: %s.\n", identity_file); 1089 memset(passphrase1, 0, strlen(passphrase1)); 1090 xfree(passphrase1); 1091 key_free(private); 1092 xfree(comment); 1093 exit(1); 1094 } 1095 /* Destroy the passphrase and the copy of the key in memory. */ 1096 memset(passphrase1, 0, strlen(passphrase1)); 1097 xfree(passphrase1); 1098 key_free(private); /* Destroys contents */ 1099 xfree(comment); 1100 1101 printf("Your identification has been saved with the new passphrase.\n"); 1102 exit(0); 1103 } 1104 1105 /* 1106 * Print the SSHFP RR. 1107 */ 1108 static int 1109 do_print_resource_record(struct passwd *pw, char *fname, char *hname) 1110 { 1111 Key *public; 1112 char *comment = NULL; 1113 struct stat st; 1114 1115 if (fname == NULL) 1116 ask_filename(pw, "Enter file in which the key is"); 1117 if (stat(fname, &st) < 0) { 1118 if (errno == ENOENT) 1119 return 0; 1120 perror(fname); 1121 exit(1); 1122 } 1123 public = key_load_public(fname, &comment); 1124 if (public != NULL) { 1125 export_dns_rr(hname, public, stdout, print_generic); 1126 key_free(public); 1127 xfree(comment); 1128 return 1; 1129 } 1130 if (comment) 1131 xfree(comment); 1132 1133 printf("failed to read v2 public key from %s.\n", fname); 1134 exit(1); 1135 } 1136 1137 /* 1138 * Change the comment of a private key file. 1139 */ 1140 static void 1141 do_change_comment(struct passwd *pw) 1142 { 1143 char new_comment[1024], *comment, *passphrase; 1144 Key *private; 1145 Key *public; 1146 struct stat st; 1147 FILE *f; 1148 int fd; 1149 1150 if (!have_identity) 1151 ask_filename(pw, "Enter file in which the key is"); 1152 if (stat(identity_file, &st) < 0) { 1153 perror(identity_file); 1154 exit(1); 1155 } 1156 private = key_load_private(identity_file, "", &comment); 1157 if (private == NULL) { 1158 if (identity_passphrase) 1159 passphrase = xstrdup(identity_passphrase); 1160 else if (identity_new_passphrase) 1161 passphrase = xstrdup(identity_new_passphrase); 1162 else 1163 passphrase = read_passphrase("Enter passphrase: ", 1164 RP_ALLOW_STDIN); 1165 /* Try to load using the passphrase. */ 1166 private = key_load_private(identity_file, passphrase, &comment); 1167 if (private == NULL) { 1168 memset(passphrase, 0, strlen(passphrase)); 1169 xfree(passphrase); 1170 printf("Bad passphrase.\n"); 1171 exit(1); 1172 } 1173 } else { 1174 passphrase = xstrdup(""); 1175 } 1176 if (private->type != KEY_RSA1) { 1177 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 1178 key_free(private); 1179 exit(1); 1180 } 1181 printf("Key now has comment '%s'\n", comment); 1182 1183 if (identity_comment) { 1184 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1185 } else { 1186 printf("Enter new comment: "); 1187 fflush(stdout); 1188 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1189 memset(passphrase, 0, strlen(passphrase)); 1190 key_free(private); 1191 exit(1); 1192 } 1193 new_comment[strcspn(new_comment, "\n")] = '\0'; 1194 } 1195 1196 /* Save the file using the new passphrase. */ 1197 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 1198 printf("Saving the key failed: %s.\n", identity_file); 1199 memset(passphrase, 0, strlen(passphrase)); 1200 xfree(passphrase); 1201 key_free(private); 1202 xfree(comment); 1203 exit(1); 1204 } 1205 memset(passphrase, 0, strlen(passphrase)); 1206 xfree(passphrase); 1207 public = key_from_private(private); 1208 key_free(private); 1209 1210 strlcat(identity_file, ".pub", sizeof(identity_file)); 1211 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1212 if (fd == -1) { 1213 printf("Could not save your public key in %s\n", identity_file); 1214 exit(1); 1215 } 1216 f = fdopen(fd, "w"); 1217 if (f == NULL) { 1218 printf("fdopen %s failed\n", identity_file); 1219 exit(1); 1220 } 1221 if (!key_write(public, f)) 1222 fprintf(stderr, "write key failed\n"); 1223 key_free(public); 1224 fprintf(f, " %s\n", new_comment); 1225 fclose(f); 1226 1227 xfree(comment); 1228 1229 printf("The comment in your key file has been changed.\n"); 1230 exit(0); 1231 } 1232 1233 static const char * 1234 fmt_validity(u_int64_t valid_from, u_int64_t valid_to) 1235 { 1236 char from[32], to[32]; 1237 static char ret[64]; 1238 time_t tt; 1239 struct tm *tm; 1240 1241 *from = *to = '\0'; 1242 if (valid_from == 0 && valid_to == 0xffffffffffffffffULL) 1243 return "forever"; 1244 1245 if (valid_from != 0) { 1246 /* XXX revisit INT_MAX in 2038 :) */ 1247 tt = valid_from > INT_MAX ? INT_MAX : valid_from; 1248 tm = localtime(&tt); 1249 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); 1250 } 1251 if (valid_to != 0xffffffffffffffffULL) { 1252 /* XXX revisit INT_MAX in 2038 :) */ 1253 tt = valid_to > INT_MAX ? INT_MAX : valid_to; 1254 tm = localtime(&tt); 1255 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); 1256 } 1257 1258 if (valid_from == 0) { 1259 snprintf(ret, sizeof(ret), "before %s", to); 1260 return ret; 1261 } 1262 if (valid_to == 0xffffffffffffffffULL) { 1263 snprintf(ret, sizeof(ret), "after %s", from); 1264 return ret; 1265 } 1266 1267 snprintf(ret, sizeof(ret), "from %s to %s", from, to); 1268 return ret; 1269 } 1270 1271 static void 1272 add_flag_option(Buffer *c, const char *name) 1273 { 1274 debug3("%s: %s", __func__, name); 1275 buffer_put_cstring(c, name); 1276 buffer_put_string(c, NULL, 0); 1277 } 1278 1279 static void 1280 add_string_option(Buffer *c, const char *name, const char *value) 1281 { 1282 Buffer b; 1283 1284 debug3("%s: %s=%s", __func__, name, value); 1285 buffer_init(&b); 1286 buffer_put_cstring(&b, value); 1287 1288 buffer_put_cstring(c, name); 1289 buffer_put_string(c, buffer_ptr(&b), buffer_len(&b)); 1290 1291 buffer_free(&b); 1292 } 1293 1294 #define OPTIONS_CRITICAL 1 1295 #define OPTIONS_EXTENSIONS 2 1296 static void 1297 prepare_options_buf(Buffer *c, int which) 1298 { 1299 buffer_clear(c); 1300 if ((which & OPTIONS_CRITICAL) != 0 && 1301 certflags_command != NULL) 1302 add_string_option(c, "force-command", certflags_command); 1303 if ((which & OPTIONS_EXTENSIONS) != 0 && 1304 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1305 add_flag_option(c, "permit-agent-forwarding"); 1306 if ((which & OPTIONS_EXTENSIONS) != 0 && 1307 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1308 add_flag_option(c, "permit-port-forwarding"); 1309 if ((which & OPTIONS_EXTENSIONS) != 0 && 1310 (certflags_flags & CERTOPT_PTY) != 0) 1311 add_flag_option(c, "permit-pty"); 1312 if ((which & OPTIONS_EXTENSIONS) != 0 && 1313 (certflags_flags & CERTOPT_USER_RC) != 0) 1314 add_flag_option(c, "permit-user-rc"); 1315 if ((which & OPTIONS_EXTENSIONS) != 0 && 1316 (certflags_flags & CERTOPT_X_FWD) != 0) 1317 add_flag_option(c, "permit-X11-forwarding"); 1318 if ((which & OPTIONS_CRITICAL) != 0 && 1319 certflags_src_addr != NULL) 1320 add_string_option(c, "source-address", certflags_src_addr); 1321 } 1322 1323 static Key * 1324 load_pkcs11_key(char *path) 1325 { 1326 #ifdef ENABLE_PKCS11 1327 Key **keys = NULL, *public, *private = NULL; 1328 int i, nkeys; 1329 1330 if ((public = key_load_public(path, NULL)) == NULL) 1331 fatal("Couldn't load CA public key \"%s\"", path); 1332 1333 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1334 debug3("%s: %d keys", __func__, nkeys); 1335 if (nkeys <= 0) 1336 fatal("cannot read public key from pkcs11"); 1337 for (i = 0; i < nkeys; i++) { 1338 if (key_equal_public(public, keys[i])) { 1339 private = keys[i]; 1340 continue; 1341 } 1342 key_free(keys[i]); 1343 } 1344 xfree(keys); 1345 key_free(public); 1346 return private; 1347 #else 1348 fatal("no pkcs11 support"); 1349 #endif /* ENABLE_PKCS11 */ 1350 } 1351 1352 static void 1353 do_ca_sign(struct passwd *pw, int argc, char **argv) 1354 { 1355 int i, fd; 1356 u_int n; 1357 Key *ca, *public; 1358 char *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1359 FILE *f; 1360 int v00 = 0; /* legacy keys */ 1361 1362 if (key_type_name != NULL) { 1363 switch (key_type_from_name(key_type_name)) { 1364 case KEY_RSA_CERT_V00: 1365 case KEY_DSA_CERT_V00: 1366 v00 = 1; 1367 break; 1368 case KEY_UNSPEC: 1369 if (strcasecmp(key_type_name, "v00") == 0) { 1370 v00 = 1; 1371 break; 1372 } else if (strcasecmp(key_type_name, "v01") == 0) 1373 break; 1374 /* FALLTHROUGH */ 1375 default: 1376 fprintf(stderr, "unknown key type %s\n", key_type_name); 1377 exit(1); 1378 } 1379 } 1380 1381 pkcs11_init(1); 1382 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1383 if (pkcs11provider != NULL) { 1384 if ((ca = load_pkcs11_key(tmp)) == NULL) 1385 fatal("No PKCS#11 key matching %s found", ca_key_path); 1386 } else if ((ca = load_identity(tmp)) == NULL) 1387 fatal("Couldn't load CA key \"%s\"", tmp); 1388 xfree(tmp); 1389 1390 for (i = 0; i < argc; i++) { 1391 /* Split list of principals */ 1392 n = 0; 1393 if (cert_principals != NULL) { 1394 otmp = tmp = xstrdup(cert_principals); 1395 plist = NULL; 1396 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1397 plist = xrealloc(plist, n + 1, sizeof(*plist)); 1398 if (*(plist[n] = xstrdup(cp)) == '\0') 1399 fatal("Empty principal name"); 1400 } 1401 xfree(otmp); 1402 } 1403 1404 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1405 if ((public = key_load_public(tmp, &comment)) == NULL) 1406 fatal("%s: unable to open \"%s\"", __func__, tmp); 1407 if (public->type != KEY_RSA && public->type != KEY_DSA) 1408 fatal("%s: key \"%s\" type %s cannot be certified", 1409 __func__, tmp, key_type(public)); 1410 1411 /* Prepare certificate to sign */ 1412 if (key_to_certified(public, v00) != 0) 1413 fatal("Could not upgrade key %s to certificate", tmp); 1414 public->cert->type = cert_key_type; 1415 public->cert->serial = (u_int64_t)cert_serial; 1416 public->cert->key_id = xstrdup(cert_key_id); 1417 public->cert->nprincipals = n; 1418 public->cert->principals = plist; 1419 public->cert->valid_after = cert_valid_from; 1420 public->cert->valid_before = cert_valid_to; 1421 if (v00) { 1422 prepare_options_buf(&public->cert->critical, 1423 OPTIONS_CRITICAL|OPTIONS_EXTENSIONS); 1424 } else { 1425 prepare_options_buf(&public->cert->critical, 1426 OPTIONS_CRITICAL); 1427 prepare_options_buf(&public->cert->extensions, 1428 OPTIONS_EXTENSIONS); 1429 } 1430 public->cert->signature_key = key_from_private(ca); 1431 1432 if (key_certify(public, ca) != 0) 1433 fatal("Couldn't not certify key %s", tmp); 1434 1435 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1436 *cp = '\0'; 1437 xasprintf(&out, "%s-cert.pub", tmp); 1438 xfree(tmp); 1439 1440 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1441 fatal("Could not open \"%s\" for writing: %s", out, 1442 strerror(errno)); 1443 if ((f = fdopen(fd, "w")) == NULL) 1444 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1445 if (!key_write(public, f)) 1446 fatal("Could not write certified key to %s", out); 1447 fprintf(f, " %s\n", comment); 1448 fclose(f); 1449 1450 if (!quiet) { 1451 logit("Signed %s key %s: id \"%s\" serial %ju%s%s " 1452 "valid %s", key_cert_type(public), 1453 out, public->cert->key_id, 1454 (intmax_t)public->cert->serial, 1455 cert_principals != NULL ? " for " : "", 1456 cert_principals != NULL ? cert_principals : "", 1457 fmt_validity(cert_valid_from, cert_valid_to)); 1458 } 1459 1460 key_free(public); 1461 xfree(out); 1462 } 1463 pkcs11_terminate(); 1464 exit(0); 1465 } 1466 1467 static u_int64_t 1468 parse_relative_time(const char *s, time_t now) 1469 { 1470 int64_t mul, secs; 1471 1472 mul = *s == '-' ? -1 : 1; 1473 1474 if ((secs = convtime(s + 1)) == -1) 1475 fatal("Invalid relative certificate time %s", s); 1476 if (mul == -1 && secs > now) 1477 fatal("Certificate time %s cannot be represented", s); 1478 return now + (u_int64_t)(secs * mul); 1479 } 1480 1481 static u_int64_t 1482 parse_absolute_time(const char *s) 1483 { 1484 struct tm tm; 1485 time_t tt; 1486 char buf[32], *fmt; 1487 1488 /* 1489 * POSIX strptime says "The application shall ensure that there 1490 * is white-space or other non-alphanumeric characters between 1491 * any two conversion specifications" so arrange things this way. 1492 */ 1493 switch (strlen(s)) { 1494 case 8: 1495 fmt = "%Y-%m-%d"; 1496 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1497 break; 1498 case 14: 1499 fmt = "%Y-%m-%dT%H:%M:%S"; 1500 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1501 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1502 break; 1503 default: 1504 fatal("Invalid certificate time format %s", s); 1505 } 1506 1507 bzero(&tm, sizeof(tm)); 1508 if (strptime(buf, fmt, &tm) == NULL) 1509 fatal("Invalid certificate time %s", s); 1510 if ((tt = mktime(&tm)) < 0) 1511 fatal("Certificate time %s cannot be represented", s); 1512 return (u_int64_t)tt; 1513 } 1514 1515 static void 1516 parse_cert_times(char *timespec) 1517 { 1518 char *from, *to; 1519 time_t now = time(NULL); 1520 int64_t secs; 1521 1522 /* +timespec relative to now */ 1523 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1524 if ((secs = convtime(timespec + 1)) == -1) 1525 fatal("Invalid relative certificate life %s", timespec); 1526 cert_valid_to = now + secs; 1527 /* 1528 * Backdate certificate one minute to avoid problems on hosts 1529 * with poorly-synchronised clocks. 1530 */ 1531 cert_valid_from = ((now - 59)/ 60) * 60; 1532 return; 1533 } 1534 1535 /* 1536 * from:to, where 1537 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1538 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1539 */ 1540 from = xstrdup(timespec); 1541 to = strchr(from, ':'); 1542 if (to == NULL || from == to || *(to + 1) == '\0') 1543 fatal("Invalid certificate life specification %s", timespec); 1544 *to++ = '\0'; 1545 1546 if (*from == '-' || *from == '+') 1547 cert_valid_from = parse_relative_time(from, now); 1548 else 1549 cert_valid_from = parse_absolute_time(from); 1550 1551 if (*to == '-' || *to == '+') 1552 cert_valid_to = parse_relative_time(to, cert_valid_from); 1553 else 1554 cert_valid_to = parse_absolute_time(to); 1555 1556 if (cert_valid_to <= cert_valid_from) 1557 fatal("Empty certificate validity interval"); 1558 xfree(from); 1559 } 1560 1561 static void 1562 add_cert_option(char *opt) 1563 { 1564 char *val; 1565 1566 if (strcmp(opt, "clear") == 0) 1567 certflags_flags = 0; 1568 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1569 certflags_flags &= ~CERTOPT_X_FWD; 1570 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1571 certflags_flags |= CERTOPT_X_FWD; 1572 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1573 certflags_flags &= ~CERTOPT_AGENT_FWD; 1574 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1575 certflags_flags |= CERTOPT_AGENT_FWD; 1576 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1577 certflags_flags &= ~CERTOPT_PORT_FWD; 1578 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1579 certflags_flags |= CERTOPT_PORT_FWD; 1580 else if (strcasecmp(opt, "no-pty") == 0) 1581 certflags_flags &= ~CERTOPT_PTY; 1582 else if (strcasecmp(opt, "permit-pty") == 0) 1583 certflags_flags |= CERTOPT_PTY; 1584 else if (strcasecmp(opt, "no-user-rc") == 0) 1585 certflags_flags &= ~CERTOPT_USER_RC; 1586 else if (strcasecmp(opt, "permit-user-rc") == 0) 1587 certflags_flags |= CERTOPT_USER_RC; 1588 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1589 val = opt + 14; 1590 if (*val == '\0') 1591 fatal("Empty force-command option"); 1592 if (certflags_command != NULL) 1593 fatal("force-command already specified"); 1594 certflags_command = xstrdup(val); 1595 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1596 val = opt + 15; 1597 if (*val == '\0') 1598 fatal("Empty source-address option"); 1599 if (certflags_src_addr != NULL) 1600 fatal("source-address already specified"); 1601 if (addr_match_cidr_list(NULL, val) != 0) 1602 fatal("Invalid source-address list"); 1603 certflags_src_addr = xstrdup(val); 1604 } else 1605 fatal("Unsupported certificate option \"%s\"", opt); 1606 } 1607 1608 static void 1609 show_options(const Buffer *optbuf, int v00, int in_critical) 1610 { 1611 u_char *name, *data; 1612 u_int dlen; 1613 Buffer options, option; 1614 1615 buffer_init(&options); 1616 buffer_append(&options, buffer_ptr(optbuf), buffer_len(optbuf)); 1617 1618 buffer_init(&option); 1619 while (buffer_len(&options) != 0) { 1620 name = buffer_get_string(&options, NULL); 1621 data = buffer_get_string_ptr(&options, &dlen); 1622 buffer_append(&option, data, dlen); 1623 printf(" %s", name); 1624 if ((v00 || !in_critical) && 1625 (strcmp(name, "permit-X11-forwarding") == 0 || 1626 strcmp(name, "permit-agent-forwarding") == 0 || 1627 strcmp(name, "permit-port-forwarding") == 0 || 1628 strcmp(name, "permit-pty") == 0 || 1629 strcmp(name, "permit-user-rc") == 0)) 1630 printf("\n"); 1631 else if ((v00 || in_critical) && 1632 (strcmp(name, "force-command") == 0 || 1633 strcmp(name, "source-address") == 0)) { 1634 data = buffer_get_string(&option, NULL); 1635 printf(" %s\n", data); 1636 xfree(data); 1637 } else { 1638 printf(" UNKNOWN OPTION (len %u)\n", 1639 buffer_len(&option)); 1640 buffer_clear(&option); 1641 } 1642 xfree(name); 1643 if (buffer_len(&option) != 0) 1644 fatal("Option corrupt: extra data at end"); 1645 } 1646 buffer_free(&option); 1647 buffer_free(&options); 1648 } 1649 1650 static void 1651 do_show_cert(struct passwd *pw) 1652 { 1653 Key *key; 1654 struct stat st; 1655 char *key_fp, *ca_fp; 1656 u_int i, v00; 1657 1658 if (!have_identity) 1659 ask_filename(pw, "Enter file in which the key is"); 1660 if (stat(identity_file, &st) < 0) 1661 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1662 if ((key = key_load_public(identity_file, NULL)) == NULL) 1663 fatal("%s is not a public key", identity_file); 1664 if (!key_is_cert(key)) 1665 fatal("%s is not a certificate", identity_file); 1666 v00 = key->type == KEY_RSA_CERT_V00 || key->type == KEY_DSA_CERT_V00; 1667 1668 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); 1669 ca_fp = key_fingerprint(key->cert->signature_key, 1670 SSH_FP_MD5, SSH_FP_HEX); 1671 1672 printf("%s:\n", identity_file); 1673 printf(" Type: %s %s certificate\n", key_ssh_name(key), 1674 key_cert_type(key)); 1675 printf(" Public key: %s %s\n", key_type(key), key_fp); 1676 printf(" Signing CA: %s %s\n", 1677 key_type(key->cert->signature_key), ca_fp); 1678 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1679 if (!v00) 1680 printf(" Serial: %ju\n", (intmax_t)key->cert->serial); 1681 printf(" Valid: %s\n", 1682 fmt_validity(key->cert->valid_after, key->cert->valid_before)); 1683 printf(" Principals: "); 1684 if (key->cert->nprincipals == 0) 1685 printf("(none)\n"); 1686 else { 1687 for (i = 0; i < key->cert->nprincipals; i++) 1688 printf("\n %s", 1689 key->cert->principals[i]); 1690 printf("\n"); 1691 } 1692 printf(" Critical Options: "); 1693 if (buffer_len(&key->cert->critical) == 0) 1694 printf("(none)\n"); 1695 else { 1696 printf("\n"); 1697 show_options(&key->cert->critical, v00, 1); 1698 } 1699 if (!v00) { 1700 printf(" Extensions: "); 1701 if (buffer_len(&key->cert->extensions) == 0) 1702 printf("(none)\n"); 1703 else { 1704 printf("\n"); 1705 show_options(&key->cert->extensions, v00, 0); 1706 } 1707 } 1708 exit(0); 1709 } 1710 1711 static void 1712 usage(void) 1713 { 1714 fprintf(stderr, "usage: %s [options]\n", __progname); 1715 fprintf(stderr, "Options:\n"); 1716 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); 1717 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 1718 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 1719 fprintf(stderr, " -C comment Provide new comment.\n"); 1720 fprintf(stderr, " -c Change comment in private and public key files.\n"); 1721 #ifdef ENABLE_PKCS11 1722 fprintf(stderr, " -D pkcs11 Download public key from pkcs11 token.\n"); 1723 #endif 1724 fprintf(stderr, " -e Export OpenSSH to foreign format key file.\n"); 1725 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); 1726 fprintf(stderr, " -f filename Filename of the key file.\n"); 1727 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); 1728 fprintf(stderr, " -g Use generic DNS resource record format.\n"); 1729 fprintf(stderr, " -H Hash names in known_hosts file.\n"); 1730 fprintf(stderr, " -h Generate host certificate instead of a user certificate.\n"); 1731 fprintf(stderr, " -I key_id Key identifier to include in certificate.\n"); 1732 fprintf(stderr, " -i Import foreign format to OpenSSH key file.\n"); 1733 fprintf(stderr, " -L Print the contents of a certificate.\n"); 1734 fprintf(stderr, " -l Show fingerprint of key file.\n"); 1735 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); 1736 fprintf(stderr, " -m key_fmt Conversion format for -e/-i (PEM|PKCS8|RFC4716).\n"); 1737 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 1738 fprintf(stderr, " -n name,... User/host principal names to include in certificate\n"); 1739 fprintf(stderr, " -O option Specify a certificate option.\n"); 1740 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 1741 fprintf(stderr, " -p Change passphrase of private key file.\n"); 1742 fprintf(stderr, " -q Quiet.\n"); 1743 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); 1744 fprintf(stderr, " -r hostname Print DNS resource record.\n"); 1745 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); 1746 fprintf(stderr, " -s ca_key Certify keys with CA key.\n"); 1747 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); 1748 fprintf(stderr, " -t type Specify type of key to create.\n"); 1749 fprintf(stderr, " -V from:to Specify certificate validity interval.\n"); 1750 fprintf(stderr, " -v Verbose.\n"); 1751 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); 1752 fprintf(stderr, " -y Read private key file and print public key.\n"); 1753 fprintf(stderr, " -z serial Specify a serial number.\n"); 1754 1755 exit(1); 1756 } 1757 1758 /* 1759 * Main program for key management. 1760 */ 1761 int 1762 main(int argc, char **argv) 1763 { 1764 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 1765 char out_file[MAXPATHLEN], *rr_hostname = NULL; 1766 Key *private, *public; 1767 struct passwd *pw; 1768 struct stat st; 1769 int opt, type, fd; 1770 u_int maxbits; 1771 u_int32_t memory = 0, generator_wanted = 0, trials = 100; 1772 int do_gen_candidates = 0, do_screen_candidates = 0; 1773 BIGNUM *start = NULL; 1774 FILE *f; 1775 const char *errstr; 1776 1777 extern int optind; 1778 extern char *optarg; 1779 1780 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 1781 sanitise_stdfd(); 1782 1783 __progname = ssh_get_progname(argv[0]); 1784 1785 SSLeay_add_all_algorithms(); 1786 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 1787 1788 init_rng(); 1789 seed_rng(); 1790 1791 /* we need this for the home * directory. */ 1792 pw = getpwuid(getuid()); 1793 if (!pw) { 1794 printf("You don't exist, go away!\n"); 1795 exit(1); 1796 } 1797 if (gethostname(hostname, sizeof(hostname)) < 0) { 1798 perror("gethostname"); 1799 exit(1); 1800 } 1801 1802 while ((opt = getopt(argc, argv, "degiqpclBHLhvxXyF:b:f:t:D:I:P:m:N:n:" 1803 "O:C:r:g:R:T:G:M:S:s:a:V:W:z:")) != -1) { 1804 switch (opt) { 1805 case 'b': 1806 bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr); 1807 if (errstr) 1808 fatal("Bits has bad value %s (%s)", 1809 optarg, errstr); 1810 break; 1811 case 'F': 1812 find_host = 1; 1813 rr_hostname = optarg; 1814 break; 1815 case 'H': 1816 hash_hosts = 1; 1817 break; 1818 case 'I': 1819 cert_key_id = optarg; 1820 break; 1821 case 'R': 1822 delete_host = 1; 1823 rr_hostname = optarg; 1824 break; 1825 case 'L': 1826 show_cert = 1; 1827 break; 1828 case 'l': 1829 print_fingerprint = 1; 1830 break; 1831 case 'B': 1832 print_bubblebabble = 1; 1833 break; 1834 case 'm': 1835 if (strcasecmp(optarg, "RFC4716") == 0 || 1836 strcasecmp(optarg, "ssh2") == 0) { 1837 convert_format = FMT_RFC4716; 1838 break; 1839 } 1840 if (strcasecmp(optarg, "PKCS8") == 0) { 1841 convert_format = FMT_PKCS8; 1842 break; 1843 } 1844 if (strcasecmp(optarg, "PEM") == 0) { 1845 convert_format = FMT_PEM; 1846 break; 1847 } 1848 fatal("Unsupported conversion format \"%s\"", optarg); 1849 case 'n': 1850 cert_principals = optarg; 1851 break; 1852 case 'p': 1853 change_passphrase = 1; 1854 break; 1855 case 'c': 1856 change_comment = 1; 1857 break; 1858 case 'f': 1859 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= 1860 sizeof(identity_file)) 1861 fatal("Identity filename too long"); 1862 have_identity = 1; 1863 break; 1864 case 'g': 1865 print_generic = 1; 1866 break; 1867 case 'P': 1868 identity_passphrase = optarg; 1869 break; 1870 case 'N': 1871 identity_new_passphrase = optarg; 1872 break; 1873 case 'O': 1874 add_cert_option(optarg); 1875 break; 1876 case 'C': 1877 identity_comment = optarg; 1878 break; 1879 case 'q': 1880 quiet = 1; 1881 break; 1882 case 'e': 1883 case 'x': 1884 /* export key */ 1885 convert_to = 1; 1886 break; 1887 case 'h': 1888 cert_key_type = SSH2_CERT_TYPE_HOST; 1889 certflags_flags = 0; 1890 break; 1891 case 'i': 1892 case 'X': 1893 /* import key */ 1894 convert_from = 1; 1895 break; 1896 case 'y': 1897 print_public = 1; 1898 break; 1899 case 'd': 1900 key_type_name = "dsa"; 1901 break; 1902 case 's': 1903 ca_key_path = optarg; 1904 break; 1905 case 't': 1906 key_type_name = optarg; 1907 break; 1908 case 'D': 1909 pkcs11provider = optarg; 1910 break; 1911 case 'v': 1912 if (log_level == SYSLOG_LEVEL_INFO) 1913 log_level = SYSLOG_LEVEL_DEBUG1; 1914 else { 1915 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 1916 log_level < SYSLOG_LEVEL_DEBUG3) 1917 log_level++; 1918 } 1919 break; 1920 case 'r': 1921 rr_hostname = optarg; 1922 break; 1923 case 'W': 1924 generator_wanted = (u_int32_t)strtonum(optarg, 1, 1925 UINT_MAX, &errstr); 1926 if (errstr) 1927 fatal("Desired generator has bad value: %s (%s)", 1928 optarg, errstr); 1929 break; 1930 case 'a': 1931 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 1932 if (errstr) 1933 fatal("Invalid number of trials: %s (%s)", 1934 optarg, errstr); 1935 break; 1936 case 'M': 1937 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 1938 if (errstr) 1939 fatal("Memory limit is %s: %s", errstr, optarg); 1940 break; 1941 case 'G': 1942 do_gen_candidates = 1; 1943 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 1944 sizeof(out_file)) 1945 fatal("Output filename too long"); 1946 break; 1947 case 'T': 1948 do_screen_candidates = 1; 1949 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 1950 sizeof(out_file)) 1951 fatal("Output filename too long"); 1952 break; 1953 case 'S': 1954 /* XXX - also compare length against bits */ 1955 if (BN_hex2bn(&start, optarg) == 0) 1956 fatal("Invalid start point."); 1957 break; 1958 case 'V': 1959 parse_cert_times(optarg); 1960 break; 1961 case 'z': 1962 cert_serial = strtonum(optarg, 0, LLONG_MAX, &errstr); 1963 if (errstr) 1964 fatal("Invalid serial number: %s", errstr); 1965 break; 1966 case '?': 1967 default: 1968 usage(); 1969 } 1970 } 1971 1972 /* reinit */ 1973 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 1974 1975 argv += optind; 1976 argc -= optind; 1977 1978 if (ca_key_path != NULL) { 1979 if (argc < 1) { 1980 printf("Too few arguments.\n"); 1981 usage(); 1982 } 1983 } else if (argc > 0) { 1984 printf("Too many arguments.\n"); 1985 usage(); 1986 } 1987 if (change_passphrase && change_comment) { 1988 printf("Can only have one of -p and -c.\n"); 1989 usage(); 1990 } 1991 if (print_fingerprint && (delete_host || hash_hosts)) { 1992 printf("Cannot use -l with -D or -R.\n"); 1993 usage(); 1994 } 1995 if (ca_key_path != NULL) { 1996 if (cert_key_id == NULL) 1997 fatal("Must specify key id (-I) when certifying"); 1998 do_ca_sign(pw, argc, argv); 1999 } 2000 if (show_cert) 2001 do_show_cert(pw); 2002 if (delete_host || hash_hosts || find_host) 2003 do_known_hosts(pw, rr_hostname); 2004 if (print_fingerprint || print_bubblebabble) 2005 do_fingerprint(pw); 2006 if (change_passphrase) 2007 do_change_passphrase(pw); 2008 if (change_comment) 2009 do_change_comment(pw); 2010 if (convert_to) 2011 do_convert_to(pw); 2012 if (convert_from) 2013 do_convert_from(pw); 2014 if (print_public) 2015 do_print_public(pw); 2016 if (rr_hostname != NULL) { 2017 unsigned int n = 0; 2018 2019 if (have_identity) { 2020 n = do_print_resource_record(pw, 2021 identity_file, rr_hostname); 2022 if (n == 0) { 2023 perror(identity_file); 2024 exit(1); 2025 } 2026 exit(0); 2027 } else { 2028 2029 n += do_print_resource_record(pw, 2030 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2031 n += do_print_resource_record(pw, 2032 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2033 2034 if (n == 0) 2035 fatal("no keys found."); 2036 exit(0); 2037 } 2038 } 2039 if (pkcs11provider != NULL) 2040 do_download(pw); 2041 2042 if (do_gen_candidates) { 2043 FILE *out = fopen(out_file, "w"); 2044 2045 if (out == NULL) { 2046 error("Couldn't open modulus candidate file \"%s\": %s", 2047 out_file, strerror(errno)); 2048 return (1); 2049 } 2050 if (bits == 0) 2051 bits = DEFAULT_BITS; 2052 if (gen_candidates(out, memory, bits, start) != 0) 2053 fatal("modulus candidate generation failed"); 2054 2055 return (0); 2056 } 2057 2058 if (do_screen_candidates) { 2059 FILE *in; 2060 FILE *out = fopen(out_file, "w"); 2061 2062 if (have_identity && strcmp(identity_file, "-") != 0) { 2063 if ((in = fopen(identity_file, "r")) == NULL) { 2064 fatal("Couldn't open modulus candidate " 2065 "file \"%s\": %s", identity_file, 2066 strerror(errno)); 2067 } 2068 } else 2069 in = stdin; 2070 2071 if (out == NULL) { 2072 fatal("Couldn't open moduli file \"%s\": %s", 2073 out_file, strerror(errno)); 2074 } 2075 if (prime_test(in, out, trials, generator_wanted) != 0) 2076 fatal("modulus screening failed"); 2077 return (0); 2078 } 2079 2080 arc4random_stir(); 2081 2082 if (key_type_name == NULL) 2083 key_type_name = "rsa"; 2084 2085 type = key_type_from_name(key_type_name); 2086 if (type == KEY_UNSPEC) { 2087 fprintf(stderr, "unknown key type %s\n", key_type_name); 2088 exit(1); 2089 } 2090 if (bits == 0) 2091 bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS; 2092 maxbits = (type == KEY_DSA) ? 2093 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 2094 if (bits > maxbits) { 2095 fprintf(stderr, "key bits exceeds maximum %d\n", maxbits); 2096 exit(1); 2097 } 2098 if (type == KEY_DSA && bits != 1024) 2099 fatal("DSA keys must be 1024 bits"); 2100 if (!quiet) 2101 printf("Generating public/private %s key pair.\n", key_type_name); 2102 private = key_generate(type, bits); 2103 if (private == NULL) { 2104 fprintf(stderr, "key_generate failed\n"); 2105 exit(1); 2106 } 2107 public = key_from_private(private); 2108 2109 if (!have_identity) 2110 ask_filename(pw, "Enter file in which to save the key"); 2111 2112 /* Create ~/.ssh directory if it doesn't already exist. */ 2113 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2114 pw->pw_dir, _PATH_SSH_USER_DIR); 2115 if (strstr(identity_file, dotsshdir) != NULL) { 2116 if (stat(dotsshdir, &st) < 0) { 2117 if (errno != ENOENT) { 2118 error("Could not stat %s: %s", dotsshdir, 2119 strerror(errno)); 2120 } else if (mkdir(dotsshdir, 0700) < 0) { 2121 error("Could not create directory '%s': %s", 2122 dotsshdir, strerror(errno)); 2123 } else if (!quiet) 2124 printf("Created directory '%s'.\n", dotsshdir); 2125 } 2126 } 2127 /* If the file already exists, ask the user to confirm. */ 2128 if (stat(identity_file, &st) >= 0) { 2129 char yesno[3]; 2130 printf("%s already exists.\n", identity_file); 2131 printf("Overwrite (y/n)? "); 2132 fflush(stdout); 2133 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2134 exit(1); 2135 if (yesno[0] != 'y' && yesno[0] != 'Y') 2136 exit(1); 2137 } 2138 /* Ask for a passphrase (twice). */ 2139 if (identity_passphrase) 2140 passphrase1 = xstrdup(identity_passphrase); 2141 else if (identity_new_passphrase) 2142 passphrase1 = xstrdup(identity_new_passphrase); 2143 else { 2144 passphrase_again: 2145 passphrase1 = 2146 read_passphrase("Enter passphrase (empty for no " 2147 "passphrase): ", RP_ALLOW_STDIN); 2148 passphrase2 = read_passphrase("Enter same passphrase again: ", 2149 RP_ALLOW_STDIN); 2150 if (strcmp(passphrase1, passphrase2) != 0) { 2151 /* 2152 * The passphrases do not match. Clear them and 2153 * retry. 2154 */ 2155 memset(passphrase1, 0, strlen(passphrase1)); 2156 memset(passphrase2, 0, strlen(passphrase2)); 2157 xfree(passphrase1); 2158 xfree(passphrase2); 2159 printf("Passphrases do not match. Try again.\n"); 2160 goto passphrase_again; 2161 } 2162 /* Clear the other copy of the passphrase. */ 2163 memset(passphrase2, 0, strlen(passphrase2)); 2164 xfree(passphrase2); 2165 } 2166 2167 if (identity_comment) { 2168 strlcpy(comment, identity_comment, sizeof(comment)); 2169 } else { 2170 /* Create default comment field for the passphrase. */ 2171 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2172 } 2173 2174 /* Save the key with the given passphrase and comment. */ 2175 if (!key_save_private(private, identity_file, passphrase1, comment)) { 2176 printf("Saving the key failed: %s.\n", identity_file); 2177 memset(passphrase1, 0, strlen(passphrase1)); 2178 xfree(passphrase1); 2179 exit(1); 2180 } 2181 /* Clear the passphrase. */ 2182 memset(passphrase1, 0, strlen(passphrase1)); 2183 xfree(passphrase1); 2184 2185 /* Clear the private key and the random number generator. */ 2186 key_free(private); 2187 arc4random_stir(); 2188 2189 if (!quiet) 2190 printf("Your identification has been saved in %s.\n", identity_file); 2191 2192 strlcat(identity_file, ".pub", sizeof(identity_file)); 2193 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 2194 if (fd == -1) { 2195 printf("Could not save your public key in %s\n", identity_file); 2196 exit(1); 2197 } 2198 f = fdopen(fd, "w"); 2199 if (f == NULL) { 2200 printf("fdopen %s failed\n", identity_file); 2201 exit(1); 2202 } 2203 if (!key_write(public, f)) 2204 fprintf(stderr, "write key failed\n"); 2205 fprintf(f, " %s\n", comment); 2206 fclose(f); 2207 2208 if (!quiet) { 2209 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 2210 char *ra = key_fingerprint(public, SSH_FP_MD5, 2211 SSH_FP_RANDOMART); 2212 printf("Your public key has been saved in %s.\n", 2213 identity_file); 2214 printf("The key fingerprint is:\n"); 2215 printf("%s %s\n", fp, comment); 2216 printf("The key's randomart image is:\n"); 2217 printf("%s\n", ra); 2218 xfree(ra); 2219 xfree(fp); 2220 } 2221 2222 key_free(public); 2223 exit(0); 2224 } 2225