1 /* $OpenBSD: ssh-keygen.c,v 1.210 2011/04/18 00:46:05 djm Exp $ */ 2 /* 3 * Author: Tatu Ylonen <ylo (at) cs.hut.fi> 4 * Copyright (c) 1994 Tatu Ylonen <ylo (at) 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 #include "ssh-pkcs11.h" 53 54 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */ 55 #define DEFAULT_BITS 2048 56 #define DEFAULT_BITS_DSA 1024 57 #define DEFAULT_BITS_ECDSA 256 58 u_int32_t bits = 0; 59 60 /* 61 * Flag indicating that we just want to change the passphrase. This can be 62 * set on the command line. 63 */ 64 int change_passphrase = 0; 65 66 /* 67 * Flag indicating that we just want to change the comment. This can be set 68 * on the command line. 69 */ 70 int change_comment = 0; 71 72 int quiet = 0; 73 74 int log_level = SYSLOG_LEVEL_INFO; 75 76 /* Flag indicating that we want to hash a known_hosts file */ 77 int hash_hosts = 0; 78 /* Flag indicating that we want lookup a host in known_hosts file */ 79 int find_host = 0; 80 /* Flag indicating that we want to delete a host from a known_hosts file */ 81 int delete_host = 0; 82 83 /* Flag indicating that we want to show the contents of a certificate */ 84 int show_cert = 0; 85 86 /* Flag indicating that we just want to see the key fingerprint */ 87 int print_fingerprint = 0; 88 int print_bubblebabble = 0; 89 90 /* The identity file name, given on the command line or entered by the user. */ 91 char identity_file[1024]; 92 int have_identity = 0; 93 94 /* This is set to the passphrase if given on the command line. */ 95 char *identity_passphrase = NULL; 96 97 /* This is set to the new passphrase if given on the command line. */ 98 char *identity_new_passphrase = NULL; 99 100 /* This is set to the new comment if given on the command line. */ 101 char *identity_comment = NULL; 102 103 /* Path to CA key when certifying keys. */ 104 char *ca_key_path = NULL; 105 106 /* Certificate serial number */ 107 long long cert_serial = 0; 108 109 /* Key type when certifying */ 110 u_int cert_key_type = SSH2_CERT_TYPE_USER; 111 112 /* "key ID" of signed key */ 113 char *cert_key_id = NULL; 114 115 /* Comma-separated list of principal names for certifying keys */ 116 char *cert_principals = NULL; 117 118 /* Validity period for certificates */ 119 u_int64_t cert_valid_from = 0; 120 u_int64_t cert_valid_to = ~0ULL; 121 122 /* Certificate options */ 123 #define CERTOPT_X_FWD (1) 124 #define CERTOPT_AGENT_FWD (1<<1) 125 #define CERTOPT_PORT_FWD (1<<2) 126 #define CERTOPT_PTY (1<<3) 127 #define CERTOPT_USER_RC (1<<4) 128 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 129 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 130 u_int32_t certflags_flags = CERTOPT_DEFAULT; 131 char *certflags_command = NULL; 132 char *certflags_src_addr = NULL; 133 134 /* Conversion to/from various formats */ 135 int convert_to = 0; 136 int convert_from = 0; 137 enum { 138 FMT_RFC4716, 139 FMT_PKCS8, 140 FMT_PEM 141 } convert_format = FMT_RFC4716; 142 int print_public = 0; 143 int print_generic = 0; 144 145 char *key_type_name = NULL; 146 147 /* Load key from this PKCS#11 provider */ 148 char *pkcs11provider = NULL; 149 150 /* argv0 */ 151 extern char *__progname; 152 153 char hostname[MAXHOSTNAMELEN]; 154 155 /* moduli.c */ 156 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 157 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t); 158 159 static void 160 type_bits_valid(int type, u_int32_t *bitsp) 161 { 162 u_int maxbits; 163 164 if (type == KEY_UNSPEC) { 165 fprintf(stderr, "unknown key type %s\n", key_type_name); 166 exit(1); 167 } 168 if (*bitsp == 0) { 169 if (type == KEY_DSA) 170 *bitsp = DEFAULT_BITS_DSA; 171 else if (type == KEY_ECDSA) 172 *bitsp = DEFAULT_BITS_ECDSA; 173 else 174 *bitsp = DEFAULT_BITS; 175 } 176 maxbits = (type == KEY_DSA) ? 177 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 178 if (*bitsp > maxbits) { 179 fprintf(stderr, "key bits exceeds maximum %d\n", maxbits); 180 exit(1); 181 } 182 if (type == KEY_DSA && *bitsp != 1024) 183 fatal("DSA keys must be 1024 bits"); 184 else if (type != KEY_ECDSA && *bitsp < 768) 185 fatal("Key must at least be 768 bits"); 186 else if (type == KEY_ECDSA && key_ecdsa_bits_to_nid(*bitsp) == -1) 187 fatal("Invalid ECDSA key length - valid lengths are " 188 "256, 384 or 521 bits"); 189 } 190 191 static void 192 ask_filename(struct passwd *pw, const char *prompt) 193 { 194 char buf[1024]; 195 char *name = NULL; 196 197 if (key_type_name == NULL) 198 name = _PATH_SSH_CLIENT_ID_RSA; 199 else { 200 switch (key_type_from_name(key_type_name)) { 201 case KEY_RSA1: 202 name = _PATH_SSH_CLIENT_IDENTITY; 203 break; 204 case KEY_DSA_CERT: 205 case KEY_DSA_CERT_V00: 206 case KEY_DSA: 207 name = _PATH_SSH_CLIENT_ID_DSA; 208 break; 209 #ifdef OPENSSL_HAS_ECC 210 case KEY_ECDSA_CERT: 211 case KEY_ECDSA: 212 name = _PATH_SSH_CLIENT_ID_ECDSA; 213 break; 214 #endif 215 case KEY_RSA_CERT: 216 case KEY_RSA_CERT_V00: 217 case KEY_RSA: 218 name = _PATH_SSH_CLIENT_ID_RSA; 219 break; 220 default: 221 fprintf(stderr, "bad key type\n"); 222 exit(1); 223 break; 224 } 225 } 226 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 227 fprintf(stderr, "%s (%s): ", prompt, identity_file); 228 if (fgets(buf, sizeof(buf), stdin) == NULL) 229 exit(1); 230 buf[strcspn(buf, "\n")] = '\0'; 231 if (strcmp(buf, "") != 0) 232 strlcpy(identity_file, buf, sizeof(identity_file)); 233 have_identity = 1; 234 } 235 236 static Key * 237 load_identity(char *filename) 238 { 239 char *pass; 240 Key *prv; 241 242 prv = key_load_private(filename, "", NULL); 243 if (prv == NULL) { 244 if (identity_passphrase) 245 pass = xstrdup(identity_passphrase); 246 else 247 pass = read_passphrase("Enter passphrase: ", 248 RP_ALLOW_STDIN); 249 prv = key_load_private(filename, pass, NULL); 250 memset(pass, 0, strlen(pass)); 251 xfree(pass); 252 } 253 return prv; 254 } 255 256 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 257 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 258 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 259 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 260 261 static void 262 do_convert_to_ssh2(struct passwd *pw, Key *k) 263 { 264 u_int len; 265 u_char *blob; 266 char comment[61]; 267 268 if (key_to_blob(k, &blob, &len) <= 0) { 269 fprintf(stderr, "key_to_blob failed\n"); 270 exit(1); 271 } 272 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 273 snprintf(comment, sizeof(comment), 274 "%u-bit %s, converted by %s@%s from OpenSSH", 275 key_size(k), key_type(k), 276 pw->pw_name, hostname); 277 278 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 279 fprintf(stdout, "Comment: \"%s\"\n", comment); 280 dump_base64(stdout, blob, len); 281 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 282 key_free(k); 283 xfree(blob); 284 exit(0); 285 } 286 287 static void 288 do_convert_to_pkcs8(Key *k) 289 { 290 switch (key_type_plain(k->type)) { 291 case KEY_RSA: 292 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 293 fatal("PEM_write_RSA_PUBKEY failed"); 294 break; 295 case KEY_DSA: 296 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 297 fatal("PEM_write_DSA_PUBKEY failed"); 298 break; 299 #ifdef OPENSSL_HAS_ECC 300 case KEY_ECDSA: 301 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 302 fatal("PEM_write_EC_PUBKEY failed"); 303 break; 304 #endif 305 default: 306 fatal("%s: unsupported key type %s", __func__, key_type(k)); 307 } 308 exit(0); 309 } 310 311 static void 312 do_convert_to_pem(Key *k) 313 { 314 switch (key_type_plain(k->type)) { 315 case KEY_RSA: 316 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 317 fatal("PEM_write_RSAPublicKey failed"); 318 break; 319 #if notyet /* OpenSSH 0.9.8 lacks this function */ 320 case KEY_DSA: 321 if (!PEM_write_DSAPublicKey(stdout, k->dsa)) 322 fatal("PEM_write_DSAPublicKey failed"); 323 break; 324 #endif 325 /* XXX ECDSA? */ 326 default: 327 fatal("%s: unsupported key type %s", __func__, key_type(k)); 328 } 329 exit(0); 330 } 331 332 static void 333 do_convert_to(struct passwd *pw) 334 { 335 Key *k; 336 struct stat st; 337 338 if (!have_identity) 339 ask_filename(pw, "Enter file in which the key is"); 340 if (stat(identity_file, &st) < 0) 341 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 342 if ((k = key_load_public(identity_file, NULL)) == NULL) { 343 if ((k = load_identity(identity_file)) == NULL) { 344 fprintf(stderr, "load failed\n"); 345 exit(1); 346 } 347 } 348 if (k->type == KEY_RSA1) { 349 fprintf(stderr, "version 1 keys are not supported\n"); 350 exit(1); 351 } 352 353 switch (convert_format) { 354 case FMT_RFC4716: 355 do_convert_to_ssh2(pw, k); 356 break; 357 case FMT_PKCS8: 358 do_convert_to_pkcs8(k); 359 break; 360 case FMT_PEM: 361 do_convert_to_pem(k); 362 break; 363 default: 364 fatal("%s: unknown key format %d", __func__, convert_format); 365 } 366 exit(0); 367 } 368 369 static void 370 buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 371 { 372 u_int bignum_bits = buffer_get_int(b); 373 u_int bytes = (bignum_bits + 7) / 8; 374 375 if (buffer_len(b) < bytes) 376 fatal("buffer_get_bignum_bits: input buffer too small: " 377 "need %d have %d", bytes, buffer_len(b)); 378 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL) 379 fatal("buffer_get_bignum_bits: BN_bin2bn failed"); 380 buffer_consume(b, bytes); 381 } 382 383 static Key * 384 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 385 { 386 Buffer b; 387 Key *key = NULL; 388 char *type, *cipher; 389 u_char *sig, data[] = "abcde12345"; 390 int magic, rlen, ktype, i1, i2, i3, i4; 391 u_int slen; 392 u_long e; 393 394 buffer_init(&b); 395 buffer_append(&b, blob, blen); 396 397 magic = buffer_get_int(&b); 398 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 399 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 400 buffer_free(&b); 401 return NULL; 402 } 403 i1 = buffer_get_int(&b); 404 type = buffer_get_string(&b, NULL); 405 cipher = buffer_get_string(&b, NULL); 406 i2 = buffer_get_int(&b); 407 i3 = buffer_get_int(&b); 408 i4 = buffer_get_int(&b); 409 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 410 if (strcmp(cipher, "none") != 0) { 411 error("unsupported cipher %s", cipher); 412 xfree(cipher); 413 buffer_free(&b); 414 xfree(type); 415 return NULL; 416 } 417 xfree(cipher); 418 419 if (strstr(type, "dsa")) { 420 ktype = KEY_DSA; 421 } else if (strstr(type, "rsa")) { 422 ktype = KEY_RSA; 423 } else { 424 buffer_free(&b); 425 xfree(type); 426 return NULL; 427 } 428 key = key_new_private(ktype); 429 xfree(type); 430 431 switch (key->type) { 432 case KEY_DSA: 433 buffer_get_bignum_bits(&b, key->dsa->p); 434 buffer_get_bignum_bits(&b, key->dsa->g); 435 buffer_get_bignum_bits(&b, key->dsa->q); 436 buffer_get_bignum_bits(&b, key->dsa->pub_key); 437 buffer_get_bignum_bits(&b, key->dsa->priv_key); 438 break; 439 case KEY_RSA: 440 e = buffer_get_char(&b); 441 debug("e %lx", e); 442 if (e < 30) { 443 e <<= 8; 444 e += buffer_get_char(&b); 445 debug("e %lx", e); 446 e <<= 8; 447 e += buffer_get_char(&b); 448 debug("e %lx", e); 449 } 450 if (!BN_set_word(key->rsa->e, e)) { 451 buffer_free(&b); 452 key_free(key); 453 return NULL; 454 } 455 buffer_get_bignum_bits(&b, key->rsa->d); 456 buffer_get_bignum_bits(&b, key->rsa->n); 457 buffer_get_bignum_bits(&b, key->rsa->iqmp); 458 buffer_get_bignum_bits(&b, key->rsa->q); 459 buffer_get_bignum_bits(&b, key->rsa->p); 460 rsa_generate_additional_parameters(key->rsa); 461 break; 462 } 463 rlen = buffer_len(&b); 464 if (rlen != 0) 465 error("do_convert_private_ssh2_from_blob: " 466 "remaining bytes in key blob %d", rlen); 467 buffer_free(&b); 468 469 /* try the key */ 470 key_sign(key, &sig, &slen, data, sizeof(data)); 471 key_verify(key, sig, slen, data, sizeof(data)); 472 xfree(sig); 473 return key; 474 } 475 476 static int 477 get_line(FILE *fp, char *line, size_t len) 478 { 479 int c; 480 size_t pos = 0; 481 482 line[0] = '\0'; 483 while ((c = fgetc(fp)) != EOF) { 484 if (pos >= len - 1) { 485 fprintf(stderr, "input line too long.\n"); 486 exit(1); 487 } 488 switch (c) { 489 case '\r': 490 c = fgetc(fp); 491 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { 492 fprintf(stderr, "unget: %s\n", strerror(errno)); 493 exit(1); 494 } 495 return pos; 496 case '\n': 497 return pos; 498 } 499 line[pos++] = c; 500 line[pos] = '\0'; 501 } 502 /* We reached EOF */ 503 return -1; 504 } 505 506 static void 507 do_convert_from_ssh2(struct passwd *pw, Key **k, int *private) 508 { 509 int blen; 510 u_int len; 511 char line[1024]; 512 u_char blob[8096]; 513 char encoded[8096]; 514 int escaped = 0; 515 FILE *fp; 516 517 if ((fp = fopen(identity_file, "r")) == NULL) 518 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 519 encoded[0] = '\0'; 520 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 521 if (line[blen - 1] == '\\') 522 escaped++; 523 if (strncmp(line, "----", 4) == 0 || 524 strstr(line, ": ") != NULL) { 525 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 526 *private = 1; 527 if (strstr(line, " END ") != NULL) { 528 break; 529 } 530 /* fprintf(stderr, "ignore: %s", line); */ 531 continue; 532 } 533 if (escaped) { 534 escaped--; 535 /* fprintf(stderr, "escaped: %s", line); */ 536 continue; 537 } 538 strlcat(encoded, line, sizeof(encoded)); 539 } 540 len = strlen(encoded); 541 if (((len % 4) == 3) && 542 (encoded[len-1] == '=') && 543 (encoded[len-2] == '=') && 544 (encoded[len-3] == '=')) 545 encoded[len-3] = '\0'; 546 blen = uudecode(encoded, blob, sizeof(blob)); 547 if (blen < 0) { 548 fprintf(stderr, "uudecode failed.\n"); 549 exit(1); 550 } 551 *k = *private ? 552 do_convert_private_ssh2_from_blob(blob, blen) : 553 key_from_blob(blob, blen); 554 if (*k == NULL) { 555 fprintf(stderr, "decode blob failed.\n"); 556 exit(1); 557 } 558 fclose(fp); 559 } 560 561 static void 562 do_convert_from_pkcs8(Key **k, int *private) 563 { 564 EVP_PKEY *pubkey; 565 FILE *fp; 566 567 if ((fp = fopen(identity_file, "r")) == NULL) 568 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 569 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 570 fatal("%s: %s is not a recognised public key format", __func__, 571 identity_file); 572 } 573 fclose(fp); 574 switch (EVP_PKEY_type(pubkey->type)) { 575 case EVP_PKEY_RSA: 576 *k = key_new(KEY_UNSPEC); 577 (*k)->type = KEY_RSA; 578 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 579 break; 580 case EVP_PKEY_DSA: 581 *k = key_new(KEY_UNSPEC); 582 (*k)->type = KEY_DSA; 583 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 584 break; 585 #ifdef OPENSSL_HAS_ECC 586 case EVP_PKEY_EC: 587 *k = key_new(KEY_UNSPEC); 588 (*k)->type = KEY_ECDSA; 589 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 590 (*k)->ecdsa_nid = key_ecdsa_key_to_nid((*k)->ecdsa); 591 break; 592 #endif 593 default: 594 fatal("%s: unsupported pubkey type %d", __func__, 595 EVP_PKEY_type(pubkey->type)); 596 } 597 EVP_PKEY_free(pubkey); 598 return; 599 } 600 601 static void 602 do_convert_from_pem(Key **k, int *private) 603 { 604 FILE *fp; 605 RSA *rsa; 606 #ifdef notyet 607 DSA *dsa; 608 #endif 609 610 if ((fp = fopen(identity_file, "r")) == NULL) 611 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 612 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 613 *k = key_new(KEY_UNSPEC); 614 (*k)->type = KEY_RSA; 615 (*k)->rsa = rsa; 616 fclose(fp); 617 return; 618 } 619 #if notyet /* OpenSSH 0.9.8 lacks this function */ 620 rewind(fp); 621 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 622 *k = key_new(KEY_UNSPEC); 623 (*k)->type = KEY_DSA; 624 (*k)->dsa = dsa; 625 fclose(fp); 626 return; 627 } 628 /* XXX ECDSA */ 629 #endif 630 fatal("%s: unrecognised raw private key format", __func__); 631 } 632 633 static void 634 do_convert_from(struct passwd *pw) 635 { 636 Key *k = NULL; 637 int private = 0, ok = 0; 638 struct stat st; 639 640 if (!have_identity) 641 ask_filename(pw, "Enter file in which the key is"); 642 if (stat(identity_file, &st) < 0) 643 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 644 645 switch (convert_format) { 646 case FMT_RFC4716: 647 do_convert_from_ssh2(pw, &k, &private); 648 break; 649 case FMT_PKCS8: 650 do_convert_from_pkcs8(&k, &private); 651 break; 652 case FMT_PEM: 653 do_convert_from_pem(&k, &private); 654 break; 655 default: 656 fatal("%s: unknown key format %d", __func__, convert_format); 657 } 658 659 if (!private) 660 ok = key_write(k, stdout); 661 if (ok) 662 fprintf(stdout, "\n"); 663 else { 664 switch (k->type) { 665 case KEY_DSA: 666 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 667 NULL, 0, NULL, NULL); 668 break; 669 #ifdef OPENSSL_HAS_ECC 670 case KEY_ECDSA: 671 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 672 NULL, 0, NULL, NULL); 673 break; 674 #endif 675 case KEY_RSA: 676 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 677 NULL, 0, NULL, NULL); 678 break; 679 default: 680 fatal("%s: unsupported key type %s", __func__, 681 key_type(k)); 682 } 683 } 684 685 if (!ok) { 686 fprintf(stderr, "key write failed\n"); 687 exit(1); 688 } 689 key_free(k); 690 exit(0); 691 } 692 693 static void 694 do_print_public(struct passwd *pw) 695 { 696 Key *prv; 697 struct stat st; 698 699 if (!have_identity) 700 ask_filename(pw, "Enter file in which the key is"); 701 if (stat(identity_file, &st) < 0) { 702 perror(identity_file); 703 exit(1); 704 } 705 prv = load_identity(identity_file); 706 if (prv == NULL) { 707 fprintf(stderr, "load failed\n"); 708 exit(1); 709 } 710 if (!key_write(prv, stdout)) 711 fprintf(stderr, "key_write failed"); 712 key_free(prv); 713 fprintf(stdout, "\n"); 714 exit(0); 715 } 716 717 static void 718 do_download(struct passwd *pw) 719 { 720 #ifdef ENABLE_PKCS11 721 Key **keys = NULL; 722 int i, nkeys; 723 724 pkcs11_init(0); 725 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 726 if (nkeys <= 0) 727 fatal("cannot read public key from pkcs11"); 728 for (i = 0; i < nkeys; i++) { 729 key_write(keys[i], stdout); 730 key_free(keys[i]); 731 fprintf(stdout, "\n"); 732 } 733 xfree(keys); 734 pkcs11_terminate(); 735 exit(0); 736 #else 737 fatal("no pkcs11 support"); 738 #endif /* ENABLE_PKCS11 */ 739 } 740 741 static void 742 do_fingerprint(struct passwd *pw) 743 { 744 FILE *f; 745 Key *public; 746 char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra; 747 int i, skip = 0, num = 0, invalid = 1; 748 enum fp_rep rep; 749 enum fp_type fptype; 750 struct stat st; 751 752 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 753 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 754 755 if (!have_identity) 756 ask_filename(pw, "Enter file in which the key is"); 757 if (stat(identity_file, &st) < 0) { 758 perror(identity_file); 759 exit(1); 760 } 761 public = key_load_public(identity_file, &comment); 762 if (public != NULL) { 763 fp = key_fingerprint(public, fptype, rep); 764 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 765 printf("%u %s %s (%s)\n", key_size(public), fp, comment, 766 key_type(public)); 767 if (log_level >= SYSLOG_LEVEL_VERBOSE) 768 printf("%s\n", ra); 769 key_free(public); 770 xfree(comment); 771 xfree(ra); 772 xfree(fp); 773 exit(0); 774 } 775 if (comment) { 776 xfree(comment); 777 comment = NULL; 778 } 779 780 if ((f = fopen(identity_file, "r")) == NULL) 781 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 782 783 while (fgets(line, sizeof(line), f)) { 784 if ((cp = strchr(line, '\n')) == NULL) { 785 error("line %d too long: %.40s...", 786 num + 1, line); 787 skip = 1; 788 continue; 789 } 790 num++; 791 if (skip) { 792 skip = 0; 793 continue; 794 } 795 *cp = '\0'; 796 797 /* Skip leading whitespace, empty and comment lines. */ 798 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 799 ; 800 if (!*cp || *cp == '\n' || *cp == '#') 801 continue; 802 i = strtol(cp, &ep, 10); 803 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 804 int quoted = 0; 805 comment = cp; 806 for (; *cp && (quoted || (*cp != ' ' && 807 *cp != '\t')); cp++) { 808 if (*cp == '\\' && cp[1] == '"') 809 cp++; /* Skip both */ 810 else if (*cp == '"') 811 quoted = !quoted; 812 } 813 if (!*cp) 814 continue; 815 *cp++ = '\0'; 816 } 817 ep = cp; 818 public = key_new(KEY_RSA1); 819 if (key_read(public, &cp) != 1) { 820 cp = ep; 821 key_free(public); 822 public = key_new(KEY_UNSPEC); 823 if (key_read(public, &cp) != 1) { 824 key_free(public); 825 continue; 826 } 827 } 828 comment = *cp ? cp : comment; 829 fp = key_fingerprint(public, fptype, rep); 830 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 831 printf("%u %s %s (%s)\n", key_size(public), fp, 832 comment ? comment : "no comment", key_type(public)); 833 if (log_level >= SYSLOG_LEVEL_VERBOSE) 834 printf("%s\n", ra); 835 xfree(ra); 836 xfree(fp); 837 key_free(public); 838 invalid = 0; 839 } 840 fclose(f); 841 842 if (invalid) { 843 printf("%s is not a public key file.\n", identity_file); 844 exit(1); 845 } 846 exit(0); 847 } 848 849 static void 850 do_gen_all_hostkeys(struct passwd *pw) 851 { 852 struct { 853 char *key_type; 854 char *key_type_display; 855 char *path; 856 } key_types[] = { 857 { "rsa1", "RSA1", _PATH_HOST_KEY_FILE }, 858 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 859 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 860 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 861 { NULL, NULL, NULL } 862 }; 863 864 int first = 0; 865 struct stat st; 866 Key *private, *public; 867 char comment[1024]; 868 int i, type, fd; 869 FILE *f; 870 871 for (i = 0; key_types[i].key_type; i++) { 872 if (stat(key_types[i].path, &st) == 0) 873 continue; 874 if (errno != ENOENT) { 875 printf("Could not stat %s: %s", key_types[i].path, 876 strerror(errno)); 877 first = 0; 878 continue; 879 } 880 881 if (first == 0) { 882 first = 1; 883 printf("%s: generating new host keys: ", __progname); 884 } 885 printf("%s ", key_types[i].key_type_display); 886 fflush(stdout); 887 arc4random_stir(); 888 type = key_type_from_name(key_types[i].key_type); 889 strlcpy(identity_file, key_types[i].path, sizeof(identity_file)); 890 bits = 0; 891 type_bits_valid(type, &bits); 892 private = key_generate(type, bits); 893 if (private == NULL) { 894 fprintf(stderr, "key_generate failed\n"); 895 first = 0; 896 continue; 897 } 898 public = key_from_private(private); 899 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 900 hostname); 901 if (!key_save_private(private, identity_file, "", comment)) { 902 printf("Saving the key failed: %s.\n", identity_file); 903 key_free(private); 904 key_free(public); 905 first = 0; 906 continue; 907 } 908 key_free(private); 909 arc4random_stir(); 910 strlcat(identity_file, ".pub", sizeof(identity_file)); 911 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 912 if (fd == -1) { 913 printf("Could not save your public key in %s\n", 914 identity_file); 915 key_free(public); 916 first = 0; 917 continue; 918 } 919 f = fdopen(fd, "w"); 920 if (f == NULL) { 921 printf("fdopen %s failed\n", identity_file); 922 key_free(public); 923 first = 0; 924 continue; 925 } 926 if (!key_write(public, f)) { 927 fprintf(stderr, "write key failed\n"); 928 key_free(public); 929 first = 0; 930 continue; 931 } 932 fprintf(f, " %s\n", comment); 933 fclose(f); 934 key_free(public); 935 936 } 937 if (first != 0) 938 printf("\n"); 939 } 940 941 static void 942 printhost(FILE *f, const char *name, Key *public, int ca, int hash) 943 { 944 if (print_fingerprint) { 945 enum fp_rep rep; 946 enum fp_type fptype; 947 char *fp, *ra; 948 949 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 950 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 951 fp = key_fingerprint(public, fptype, rep); 952 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 953 printf("%u %s %s (%s)\n", key_size(public), fp, name, 954 key_type(public)); 955 if (log_level >= SYSLOG_LEVEL_VERBOSE) 956 printf("%s\n", ra); 957 xfree(ra); 958 xfree(fp); 959 } else { 960 if (hash && (name = host_hash(name, NULL, 0)) == NULL) 961 fatal("hash_host failed"); 962 fprintf(f, "%s%s%s ", ca ? CA_MARKER : "", ca ? " " : "", name); 963 if (!key_write(public, f)) 964 fatal("key_write failed"); 965 fprintf(f, "\n"); 966 } 967 } 968 969 static void 970 do_known_hosts(struct passwd *pw, const char *name) 971 { 972 FILE *in, *out = stdout; 973 Key *pub; 974 char *cp, *cp2, *kp, *kp2; 975 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; 976 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; 977 int ca; 978 979 if (!have_identity) { 980 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 981 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 982 sizeof(identity_file)) 983 fatal("Specified known hosts path too long"); 984 xfree(cp); 985 have_identity = 1; 986 } 987 if ((in = fopen(identity_file, "r")) == NULL) 988 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 989 990 /* 991 * Find hosts goes to stdout, hash and deletions happen in-place 992 * A corner case is ssh-keygen -HF foo, which should go to stdout 993 */ 994 if (!find_host && (hash_hosts || delete_host)) { 995 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 996 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 997 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 998 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 999 fatal("known_hosts path too long"); 1000 umask(077); 1001 if ((c = mkstemp(tmp)) == -1) 1002 fatal("mkstemp: %s", strerror(errno)); 1003 if ((out = fdopen(c, "w")) == NULL) { 1004 c = errno; 1005 unlink(tmp); 1006 fatal("fdopen: %s", strerror(c)); 1007 } 1008 inplace = 1; 1009 } 1010 1011 while (fgets(line, sizeof(line), in)) { 1012 if ((cp = strchr(line, '\n')) == NULL) { 1013 error("line %d too long: %.40s...", num + 1, line); 1014 skip = 1; 1015 invalid = 1; 1016 continue; 1017 } 1018 num++; 1019 if (skip) { 1020 skip = 0; 1021 continue; 1022 } 1023 *cp = '\0'; 1024 1025 /* Skip leading whitespace, empty and comment lines. */ 1026 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 1027 ; 1028 if (!*cp || *cp == '\n' || *cp == '#') { 1029 if (inplace) 1030 fprintf(out, "%s\n", cp); 1031 continue; 1032 } 1033 /* Check whether this is a CA key */ 1034 if (strncasecmp(cp, CA_MARKER, sizeof(CA_MARKER) - 1) == 0 && 1035 (cp[sizeof(CA_MARKER) - 1] == ' ' || 1036 cp[sizeof(CA_MARKER) - 1] == '\t')) { 1037 ca = 1; 1038 cp += sizeof(CA_MARKER); 1039 } else 1040 ca = 0; 1041 1042 /* Find the end of the host name portion. */ 1043 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) 1044 ; 1045 1046 if (*kp == '\0' || *(kp + 1) == '\0') { 1047 error("line %d missing key: %.40s...", 1048 num, line); 1049 invalid = 1; 1050 continue; 1051 } 1052 *kp++ = '\0'; 1053 kp2 = kp; 1054 1055 pub = key_new(KEY_RSA1); 1056 if (key_read(pub, &kp) != 1) { 1057 kp = kp2; 1058 key_free(pub); 1059 pub = key_new(KEY_UNSPEC); 1060 if (key_read(pub, &kp) != 1) { 1061 error("line %d invalid key: %.40s...", 1062 num, line); 1063 key_free(pub); 1064 invalid = 1; 1065 continue; 1066 } 1067 } 1068 1069 if (*cp == HASH_DELIM) { 1070 if (find_host || delete_host) { 1071 cp2 = host_hash(name, cp, strlen(cp)); 1072 if (cp2 == NULL) { 1073 error("line %d: invalid hashed " 1074 "name: %.64s...", num, line); 1075 invalid = 1; 1076 continue; 1077 } 1078 c = (strcmp(cp2, cp) == 0); 1079 if (find_host && c) { 1080 printf("# Host %s found: " 1081 "line %d type %s%s\n", name, 1082 num, key_type(pub), 1083 ca ? " (CA key)" : ""); 1084 printhost(out, cp, pub, ca, 0); 1085 } 1086 if (delete_host && !c && !ca) 1087 printhost(out, cp, pub, ca, 0); 1088 } else if (hash_hosts) 1089 printhost(out, cp, pub, ca, 0); 1090 } else { 1091 if (find_host || delete_host) { 1092 c = (match_hostname(name, cp, 1093 strlen(cp)) == 1); 1094 if (find_host && c) { 1095 printf("# Host %s found: " 1096 "line %d type %s%s\n", name, 1097 num, key_type(pub), 1098 ca ? " (CA key)" : ""); 1099 printhost(out, name, pub, 1100 ca, hash_hosts && !ca); 1101 } 1102 if (delete_host && !c && !ca) 1103 printhost(out, cp, pub, ca, 0); 1104 } else if (hash_hosts) { 1105 for (cp2 = strsep(&cp, ","); 1106 cp2 != NULL && *cp2 != '\0'; 1107 cp2 = strsep(&cp, ",")) { 1108 if (ca) { 1109 fprintf(stderr, "Warning: " 1110 "ignoring CA key for host: " 1111 "%.64s\n", cp2); 1112 printhost(out, cp2, pub, ca, 0); 1113 } else if (strcspn(cp2, "*?!") != 1114 strlen(cp2)) { 1115 fprintf(stderr, "Warning: " 1116 "ignoring host name with " 1117 "metacharacters: %.64s\n", 1118 cp2); 1119 printhost(out, cp2, pub, ca, 0); 1120 } else 1121 printhost(out, cp2, pub, ca, 1); 1122 } 1123 has_unhashed = 1; 1124 } 1125 } 1126 key_free(pub); 1127 } 1128 fclose(in); 1129 1130 if (invalid) { 1131 fprintf(stderr, "%s is not a valid known_hosts file.\n", 1132 identity_file); 1133 if (inplace) { 1134 fprintf(stderr, "Not replacing existing known_hosts " 1135 "file because of errors\n"); 1136 fclose(out); 1137 unlink(tmp); 1138 } 1139 exit(1); 1140 } 1141 1142 if (inplace) { 1143 fclose(out); 1144 1145 /* Backup existing file */ 1146 if (unlink(old) == -1 && errno != ENOENT) 1147 fatal("unlink %.100s: %s", old, strerror(errno)); 1148 if (link(identity_file, old) == -1) 1149 fatal("link %.100s to %.100s: %s", identity_file, old, 1150 strerror(errno)); 1151 /* Move new one into place */ 1152 if (rename(tmp, identity_file) == -1) { 1153 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1154 strerror(errno)); 1155 unlink(tmp); 1156 unlink(old); 1157 exit(1); 1158 } 1159 1160 fprintf(stderr, "%s updated.\n", identity_file); 1161 fprintf(stderr, "Original contents retained as %s\n", old); 1162 if (has_unhashed) { 1163 fprintf(stderr, "WARNING: %s contains unhashed " 1164 "entries\n", old); 1165 fprintf(stderr, "Delete this file to ensure privacy " 1166 "of hostnames\n"); 1167 } 1168 } 1169 1170 exit(0); 1171 } 1172 1173 /* 1174 * Perform changing a passphrase. The argument is the passwd structure 1175 * for the current user. 1176 */ 1177 static void 1178 do_change_passphrase(struct passwd *pw) 1179 { 1180 char *comment; 1181 char *old_passphrase, *passphrase1, *passphrase2; 1182 struct stat st; 1183 Key *private; 1184 1185 if (!have_identity) 1186 ask_filename(pw, "Enter file in which the key is"); 1187 if (stat(identity_file, &st) < 0) { 1188 perror(identity_file); 1189 exit(1); 1190 } 1191 /* Try to load the file with empty passphrase. */ 1192 private = key_load_private(identity_file, "", &comment); 1193 if (private == NULL) { 1194 if (identity_passphrase) 1195 old_passphrase = xstrdup(identity_passphrase); 1196 else 1197 old_passphrase = 1198 read_passphrase("Enter old passphrase: ", 1199 RP_ALLOW_STDIN); 1200 private = key_load_private(identity_file, old_passphrase, 1201 &comment); 1202 memset(old_passphrase, 0, strlen(old_passphrase)); 1203 xfree(old_passphrase); 1204 if (private == NULL) { 1205 printf("Bad passphrase.\n"); 1206 exit(1); 1207 } 1208 } 1209 printf("Key has comment '%s'\n", comment); 1210 1211 /* Ask the new passphrase (twice). */ 1212 if (identity_new_passphrase) { 1213 passphrase1 = xstrdup(identity_new_passphrase); 1214 passphrase2 = NULL; 1215 } else { 1216 passphrase1 = 1217 read_passphrase("Enter new passphrase (empty for no " 1218 "passphrase): ", RP_ALLOW_STDIN); 1219 passphrase2 = read_passphrase("Enter same passphrase again: ", 1220 RP_ALLOW_STDIN); 1221 1222 /* Verify that they are the same. */ 1223 if (strcmp(passphrase1, passphrase2) != 0) { 1224 memset(passphrase1, 0, strlen(passphrase1)); 1225 memset(passphrase2, 0, strlen(passphrase2)); 1226 xfree(passphrase1); 1227 xfree(passphrase2); 1228 printf("Pass phrases do not match. Try again.\n"); 1229 exit(1); 1230 } 1231 /* Destroy the other copy. */ 1232 memset(passphrase2, 0, strlen(passphrase2)); 1233 xfree(passphrase2); 1234 } 1235 1236 /* Save the file using the new passphrase. */ 1237 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1238 printf("Saving the key failed: %s.\n", identity_file); 1239 memset(passphrase1, 0, strlen(passphrase1)); 1240 xfree(passphrase1); 1241 key_free(private); 1242 xfree(comment); 1243 exit(1); 1244 } 1245 /* Destroy the passphrase and the copy of the key in memory. */ 1246 memset(passphrase1, 0, strlen(passphrase1)); 1247 xfree(passphrase1); 1248 key_free(private); /* Destroys contents */ 1249 xfree(comment); 1250 1251 printf("Your identification has been saved with the new passphrase.\n"); 1252 exit(0); 1253 } 1254 1255 /* 1256 * Print the SSHFP RR. 1257 */ 1258 static int 1259 do_print_resource_record(struct passwd *pw, char *fname, char *hname) 1260 { 1261 Key *public; 1262 char *comment = NULL; 1263 struct stat st; 1264 1265 if (fname == NULL) 1266 ask_filename(pw, "Enter file in which the key is"); 1267 if (stat(fname, &st) < 0) { 1268 if (errno == ENOENT) 1269 return 0; 1270 perror(fname); 1271 exit(1); 1272 } 1273 public = key_load_public(fname, &comment); 1274 if (public != NULL) { 1275 export_dns_rr(hname, public, stdout, print_generic); 1276 key_free(public); 1277 xfree(comment); 1278 return 1; 1279 } 1280 if (comment) 1281 xfree(comment); 1282 1283 printf("failed to read v2 public key from %s.\n", fname); 1284 exit(1); 1285 } 1286 1287 /* 1288 * Change the comment of a private key file. 1289 */ 1290 static void 1291 do_change_comment(struct passwd *pw) 1292 { 1293 char new_comment[1024], *comment, *passphrase; 1294 Key *private; 1295 Key *public; 1296 struct stat st; 1297 FILE *f; 1298 int fd; 1299 1300 if (!have_identity) 1301 ask_filename(pw, "Enter file in which the key is"); 1302 if (stat(identity_file, &st) < 0) { 1303 perror(identity_file); 1304 exit(1); 1305 } 1306 private = key_load_private(identity_file, "", &comment); 1307 if (private == NULL) { 1308 if (identity_passphrase) 1309 passphrase = xstrdup(identity_passphrase); 1310 else if (identity_new_passphrase) 1311 passphrase = xstrdup(identity_new_passphrase); 1312 else 1313 passphrase = read_passphrase("Enter passphrase: ", 1314 RP_ALLOW_STDIN); 1315 /* Try to load using the passphrase. */ 1316 private = key_load_private(identity_file, passphrase, &comment); 1317 if (private == NULL) { 1318 memset(passphrase, 0, strlen(passphrase)); 1319 xfree(passphrase); 1320 printf("Bad passphrase.\n"); 1321 exit(1); 1322 } 1323 } else { 1324 passphrase = xstrdup(""); 1325 } 1326 if (private->type != KEY_RSA1) { 1327 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 1328 key_free(private); 1329 exit(1); 1330 } 1331 printf("Key now has comment '%s'\n", comment); 1332 1333 if (identity_comment) { 1334 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1335 } else { 1336 printf("Enter new comment: "); 1337 fflush(stdout); 1338 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1339 memset(passphrase, 0, strlen(passphrase)); 1340 key_free(private); 1341 exit(1); 1342 } 1343 new_comment[strcspn(new_comment, "\n")] = '\0'; 1344 } 1345 1346 /* Save the file using the new passphrase. */ 1347 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 1348 printf("Saving the key failed: %s.\n", identity_file); 1349 memset(passphrase, 0, strlen(passphrase)); 1350 xfree(passphrase); 1351 key_free(private); 1352 xfree(comment); 1353 exit(1); 1354 } 1355 memset(passphrase, 0, strlen(passphrase)); 1356 xfree(passphrase); 1357 public = key_from_private(private); 1358 key_free(private); 1359 1360 strlcat(identity_file, ".pub", sizeof(identity_file)); 1361 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1362 if (fd == -1) { 1363 printf("Could not save your public key in %s\n", identity_file); 1364 exit(1); 1365 } 1366 f = fdopen(fd, "w"); 1367 if (f == NULL) { 1368 printf("fdopen %s failed\n", identity_file); 1369 exit(1); 1370 } 1371 if (!key_write(public, f)) 1372 fprintf(stderr, "write key failed\n"); 1373 key_free(public); 1374 fprintf(f, " %s\n", new_comment); 1375 fclose(f); 1376 1377 xfree(comment); 1378 1379 printf("The comment in your key file has been changed.\n"); 1380 exit(0); 1381 } 1382 1383 static const char * 1384 fmt_validity(u_int64_t valid_from, u_int64_t valid_to) 1385 { 1386 char from[32], to[32]; 1387 static char ret[64]; 1388 time_t tt; 1389 struct tm *tm; 1390 1391 *from = *to = '\0'; 1392 if (valid_from == 0 && valid_to == 0xffffffffffffffffULL) 1393 return "forever"; 1394 1395 if (valid_from != 0) { 1396 /* XXX revisit INT_MAX in 2038 :) */ 1397 tt = valid_from > INT_MAX ? INT_MAX : valid_from; 1398 tm = localtime(&tt); 1399 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); 1400 } 1401 if (valid_to != 0xffffffffffffffffULL) { 1402 /* XXX revisit INT_MAX in 2038 :) */ 1403 tt = valid_to > INT_MAX ? INT_MAX : valid_to; 1404 tm = localtime(&tt); 1405 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); 1406 } 1407 1408 if (valid_from == 0) { 1409 snprintf(ret, sizeof(ret), "before %s", to); 1410 return ret; 1411 } 1412 if (valid_to == 0xffffffffffffffffULL) { 1413 snprintf(ret, sizeof(ret), "after %s", from); 1414 return ret; 1415 } 1416 1417 snprintf(ret, sizeof(ret), "from %s to %s", from, to); 1418 return ret; 1419 } 1420 1421 static void 1422 add_flag_option(Buffer *c, const char *name) 1423 { 1424 debug3("%s: %s", __func__, name); 1425 buffer_put_cstring(c, name); 1426 buffer_put_string(c, NULL, 0); 1427 } 1428 1429 static void 1430 add_string_option(Buffer *c, const char *name, const char *value) 1431 { 1432 Buffer b; 1433 1434 debug3("%s: %s=%s", __func__, name, value); 1435 buffer_init(&b); 1436 buffer_put_cstring(&b, value); 1437 1438 buffer_put_cstring(c, name); 1439 buffer_put_string(c, buffer_ptr(&b), buffer_len(&b)); 1440 1441 buffer_free(&b); 1442 } 1443 1444 #define OPTIONS_CRITICAL 1 1445 #define OPTIONS_EXTENSIONS 2 1446 static void 1447 prepare_options_buf(Buffer *c, int which) 1448 { 1449 buffer_clear(c); 1450 if ((which & OPTIONS_CRITICAL) != 0 && 1451 certflags_command != NULL) 1452 add_string_option(c, "force-command", certflags_command); 1453 if ((which & OPTIONS_EXTENSIONS) != 0 && 1454 (certflags_flags & CERTOPT_X_FWD) != 0) 1455 add_flag_option(c, "permit-X11-forwarding"); 1456 if ((which & OPTIONS_EXTENSIONS) != 0 && 1457 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1458 add_flag_option(c, "permit-agent-forwarding"); 1459 if ((which & OPTIONS_EXTENSIONS) != 0 && 1460 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1461 add_flag_option(c, "permit-port-forwarding"); 1462 if ((which & OPTIONS_EXTENSIONS) != 0 && 1463 (certflags_flags & CERTOPT_PTY) != 0) 1464 add_flag_option(c, "permit-pty"); 1465 if ((which & OPTIONS_EXTENSIONS) != 0 && 1466 (certflags_flags & CERTOPT_USER_RC) != 0) 1467 add_flag_option(c, "permit-user-rc"); 1468 if ((which & OPTIONS_CRITICAL) != 0 && 1469 certflags_src_addr != NULL) 1470 add_string_option(c, "source-address", certflags_src_addr); 1471 } 1472 1473 static Key * 1474 load_pkcs11_key(char *path) 1475 { 1476 #ifdef ENABLE_PKCS11 1477 Key **keys = NULL, *public, *private = NULL; 1478 int i, nkeys; 1479 1480 if ((public = key_load_public(path, NULL)) == NULL) 1481 fatal("Couldn't load CA public key \"%s\"", path); 1482 1483 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1484 debug3("%s: %d keys", __func__, nkeys); 1485 if (nkeys <= 0) 1486 fatal("cannot read public key from pkcs11"); 1487 for (i = 0; i < nkeys; i++) { 1488 if (key_equal_public(public, keys[i])) { 1489 private = keys[i]; 1490 continue; 1491 } 1492 key_free(keys[i]); 1493 } 1494 xfree(keys); 1495 key_free(public); 1496 return private; 1497 #else 1498 fatal("no pkcs11 support"); 1499 #endif /* ENABLE_PKCS11 */ 1500 } 1501 1502 static void 1503 do_ca_sign(struct passwd *pw, int argc, char **argv) 1504 { 1505 int i, fd; 1506 u_int n; 1507 Key *ca, *public; 1508 char *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1509 FILE *f; 1510 int v00 = 0; /* legacy keys */ 1511 1512 if (key_type_name != NULL) { 1513 switch (key_type_from_name(key_type_name)) { 1514 case KEY_RSA_CERT_V00: 1515 case KEY_DSA_CERT_V00: 1516 v00 = 1; 1517 break; 1518 case KEY_UNSPEC: 1519 if (strcasecmp(key_type_name, "v00") == 0) { 1520 v00 = 1; 1521 break; 1522 } else if (strcasecmp(key_type_name, "v01") == 0) 1523 break; 1524 /* FALLTHROUGH */ 1525 default: 1526 fprintf(stderr, "unknown key type %s\n", key_type_name); 1527 exit(1); 1528 } 1529 } 1530 1531 pkcs11_init(1); 1532 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1533 if (pkcs11provider != NULL) { 1534 if ((ca = load_pkcs11_key(tmp)) == NULL) 1535 fatal("No PKCS#11 key matching %s found", ca_key_path); 1536 } else if ((ca = load_identity(tmp)) == NULL) 1537 fatal("Couldn't load CA key \"%s\"", tmp); 1538 xfree(tmp); 1539 1540 for (i = 0; i < argc; i++) { 1541 /* Split list of principals */ 1542 n = 0; 1543 if (cert_principals != NULL) { 1544 otmp = tmp = xstrdup(cert_principals); 1545 plist = NULL; 1546 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1547 plist = xrealloc(plist, n + 1, sizeof(*plist)); 1548 if (*(plist[n] = xstrdup(cp)) == '\0') 1549 fatal("Empty principal name"); 1550 } 1551 xfree(otmp); 1552 } 1553 1554 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1555 if ((public = key_load_public(tmp, &comment)) == NULL) 1556 fatal("%s: unable to open \"%s\"", __func__, tmp); 1557 if (public->type != KEY_RSA && public->type != KEY_DSA && 1558 public->type != KEY_ECDSA) 1559 fatal("%s: key \"%s\" type %s cannot be certified", 1560 __func__, tmp, key_type(public)); 1561 1562 /* Prepare certificate to sign */ 1563 if (key_to_certified(public, v00) != 0) 1564 fatal("Could not upgrade key %s to certificate", tmp); 1565 public->cert->type = cert_key_type; 1566 public->cert->serial = (u_int64_t)cert_serial; 1567 public->cert->key_id = xstrdup(cert_key_id); 1568 public->cert->nprincipals = n; 1569 public->cert->principals = plist; 1570 public->cert->valid_after = cert_valid_from; 1571 public->cert->valid_before = cert_valid_to; 1572 if (v00) { 1573 prepare_options_buf(&public->cert->critical, 1574 OPTIONS_CRITICAL|OPTIONS_EXTENSIONS); 1575 } else { 1576 prepare_options_buf(&public->cert->critical, 1577 OPTIONS_CRITICAL); 1578 prepare_options_buf(&public->cert->extensions, 1579 OPTIONS_EXTENSIONS); 1580 } 1581 public->cert->signature_key = key_from_private(ca); 1582 1583 if (key_certify(public, ca) != 0) 1584 fatal("Couldn't not certify key %s", tmp); 1585 1586 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1587 *cp = '\0'; 1588 xasprintf(&out, "%s-cert.pub", tmp); 1589 xfree(tmp); 1590 1591 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1592 fatal("Could not open \"%s\" for writing: %s", out, 1593 strerror(errno)); 1594 if ((f = fdopen(fd, "w")) == NULL) 1595 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1596 if (!key_write(public, f)) 1597 fatal("Could not write certified key to %s", out); 1598 fprintf(f, " %s\n", comment); 1599 fclose(f); 1600 1601 if (!quiet) { 1602 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1603 "valid %s", key_cert_type(public), 1604 out, public->cert->key_id, 1605 (unsigned long long)public->cert->serial, 1606 cert_principals != NULL ? " for " : "", 1607 cert_principals != NULL ? cert_principals : "", 1608 fmt_validity(cert_valid_from, cert_valid_to)); 1609 } 1610 1611 key_free(public); 1612 xfree(out); 1613 } 1614 pkcs11_terminate(); 1615 exit(0); 1616 } 1617 1618 static u_int64_t 1619 parse_relative_time(const char *s, time_t now) 1620 { 1621 int64_t mul, secs; 1622 1623 mul = *s == '-' ? -1 : 1; 1624 1625 if ((secs = convtime(s + 1)) == -1) 1626 fatal("Invalid relative certificate time %s", s); 1627 if (mul == -1 && secs > now) 1628 fatal("Certificate time %s cannot be represented", s); 1629 return now + (u_int64_t)(secs * mul); 1630 } 1631 1632 static u_int64_t 1633 parse_absolute_time(const char *s) 1634 { 1635 struct tm tm; 1636 time_t tt; 1637 char buf[32], *fmt; 1638 1639 /* 1640 * POSIX strptime says "The application shall ensure that there 1641 * is white-space or other non-alphanumeric characters between 1642 * any two conversion specifications" so arrange things this way. 1643 */ 1644 switch (strlen(s)) { 1645 case 8: 1646 fmt = "%Y-%m-%d"; 1647 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1648 break; 1649 case 14: 1650 fmt = "%Y-%m-%dT%H:%M:%S"; 1651 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1652 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1653 break; 1654 default: 1655 fatal("Invalid certificate time format %s", s); 1656 } 1657 1658 bzero(&tm, sizeof(tm)); 1659 if (strptime(buf, fmt, &tm) == NULL) 1660 fatal("Invalid certificate time %s", s); 1661 if ((tt = mktime(&tm)) < 0) 1662 fatal("Certificate time %s cannot be represented", s); 1663 return (u_int64_t)tt; 1664 } 1665 1666 static void 1667 parse_cert_times(char *timespec) 1668 { 1669 char *from, *to; 1670 time_t now = time(NULL); 1671 int64_t secs; 1672 1673 /* +timespec relative to now */ 1674 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1675 if ((secs = convtime(timespec + 1)) == -1) 1676 fatal("Invalid relative certificate life %s", timespec); 1677 cert_valid_to = now + secs; 1678 /* 1679 * Backdate certificate one minute to avoid problems on hosts 1680 * with poorly-synchronised clocks. 1681 */ 1682 cert_valid_from = ((now - 59)/ 60) * 60; 1683 return; 1684 } 1685 1686 /* 1687 * from:to, where 1688 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1689 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1690 */ 1691 from = xstrdup(timespec); 1692 to = strchr(from, ':'); 1693 if (to == NULL || from == to || *(to + 1) == '\0') 1694 fatal("Invalid certificate life specification %s", timespec); 1695 *to++ = '\0'; 1696 1697 if (*from == '-' || *from == '+') 1698 cert_valid_from = parse_relative_time(from, now); 1699 else 1700 cert_valid_from = parse_absolute_time(from); 1701 1702 if (*to == '-' || *to == '+') 1703 cert_valid_to = parse_relative_time(to, cert_valid_from); 1704 else 1705 cert_valid_to = parse_absolute_time(to); 1706 1707 if (cert_valid_to <= cert_valid_from) 1708 fatal("Empty certificate validity interval"); 1709 xfree(from); 1710 } 1711 1712 static void 1713 add_cert_option(char *opt) 1714 { 1715 char *val; 1716 1717 if (strcasecmp(opt, "clear") == 0) 1718 certflags_flags = 0; 1719 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1720 certflags_flags &= ~CERTOPT_X_FWD; 1721 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1722 certflags_flags |= CERTOPT_X_FWD; 1723 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1724 certflags_flags &= ~CERTOPT_AGENT_FWD; 1725 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1726 certflags_flags |= CERTOPT_AGENT_FWD; 1727 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1728 certflags_flags &= ~CERTOPT_PORT_FWD; 1729 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1730 certflags_flags |= CERTOPT_PORT_FWD; 1731 else if (strcasecmp(opt, "no-pty") == 0) 1732 certflags_flags &= ~CERTOPT_PTY; 1733 else if (strcasecmp(opt, "permit-pty") == 0) 1734 certflags_flags |= CERTOPT_PTY; 1735 else if (strcasecmp(opt, "no-user-rc") == 0) 1736 certflags_flags &= ~CERTOPT_USER_RC; 1737 else if (strcasecmp(opt, "permit-user-rc") == 0) 1738 certflags_flags |= CERTOPT_USER_RC; 1739 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1740 val = opt + 14; 1741 if (*val == '\0') 1742 fatal("Empty force-command option"); 1743 if (certflags_command != NULL) 1744 fatal("force-command already specified"); 1745 certflags_command = xstrdup(val); 1746 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1747 val = opt + 15; 1748 if (*val == '\0') 1749 fatal("Empty source-address option"); 1750 if (certflags_src_addr != NULL) 1751 fatal("source-address already specified"); 1752 if (addr_match_cidr_list(NULL, val) != 0) 1753 fatal("Invalid source-address list"); 1754 certflags_src_addr = xstrdup(val); 1755 } else 1756 fatal("Unsupported certificate option \"%s\"", opt); 1757 } 1758 1759 static void 1760 show_options(const Buffer *optbuf, int v00, int in_critical) 1761 { 1762 u_char *name, *data; 1763 u_int dlen; 1764 Buffer options, option; 1765 1766 buffer_init(&options); 1767 buffer_append(&options, buffer_ptr(optbuf), buffer_len(optbuf)); 1768 1769 buffer_init(&option); 1770 while (buffer_len(&options) != 0) { 1771 name = buffer_get_string(&options, NULL); 1772 data = buffer_get_string_ptr(&options, &dlen); 1773 buffer_append(&option, data, dlen); 1774 printf(" %s", name); 1775 if ((v00 || !in_critical) && 1776 (strcmp(name, "permit-X11-forwarding") == 0 || 1777 strcmp(name, "permit-agent-forwarding") == 0 || 1778 strcmp(name, "permit-port-forwarding") == 0 || 1779 strcmp(name, "permit-pty") == 0 || 1780 strcmp(name, "permit-user-rc") == 0)) 1781 printf("\n"); 1782 else if ((v00 || in_critical) && 1783 (strcmp(name, "force-command") == 0 || 1784 strcmp(name, "source-address") == 0)) { 1785 data = buffer_get_string(&option, NULL); 1786 printf(" %s\n", data); 1787 xfree(data); 1788 } else { 1789 printf(" UNKNOWN OPTION (len %u)\n", 1790 buffer_len(&option)); 1791 buffer_clear(&option); 1792 } 1793 xfree(name); 1794 if (buffer_len(&option) != 0) 1795 fatal("Option corrupt: extra data at end"); 1796 } 1797 buffer_free(&option); 1798 buffer_free(&options); 1799 } 1800 1801 static void 1802 do_show_cert(struct passwd *pw) 1803 { 1804 Key *key; 1805 struct stat st; 1806 char *key_fp, *ca_fp; 1807 u_int i, v00; 1808 1809 if (!have_identity) 1810 ask_filename(pw, "Enter file in which the key is"); 1811 if (stat(identity_file, &st) < 0) 1812 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1813 if ((key = key_load_public(identity_file, NULL)) == NULL) 1814 fatal("%s is not a public key", identity_file); 1815 if (!key_is_cert(key)) 1816 fatal("%s is not a certificate", identity_file); 1817 v00 = key->type == KEY_RSA_CERT_V00 || key->type == KEY_DSA_CERT_V00; 1818 1819 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); 1820 ca_fp = key_fingerprint(key->cert->signature_key, 1821 SSH_FP_MD5, SSH_FP_HEX); 1822 1823 printf("%s:\n", identity_file); 1824 printf(" Type: %s %s certificate\n", key_ssh_name(key), 1825 key_cert_type(key)); 1826 printf(" Public key: %s %s\n", key_type(key), key_fp); 1827 printf(" Signing CA: %s %s\n", 1828 key_type(key->cert->signature_key), ca_fp); 1829 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1830 if (!v00) { 1831 printf(" Serial: %llu\n", 1832 (unsigned long long)key->cert->serial); 1833 } 1834 printf(" Valid: %s\n", 1835 fmt_validity(key->cert->valid_after, key->cert->valid_before)); 1836 printf(" Principals: "); 1837 if (key->cert->nprincipals == 0) 1838 printf("(none)\n"); 1839 else { 1840 for (i = 0; i < key->cert->nprincipals; i++) 1841 printf("\n %s", 1842 key->cert->principals[i]); 1843 printf("\n"); 1844 } 1845 printf(" Critical Options: "); 1846 if (buffer_len(&key->cert->critical) == 0) 1847 printf("(none)\n"); 1848 else { 1849 printf("\n"); 1850 show_options(&key->cert->critical, v00, 1); 1851 } 1852 if (!v00) { 1853 printf(" Extensions: "); 1854 if (buffer_len(&key->cert->extensions) == 0) 1855 printf("(none)\n"); 1856 else { 1857 printf("\n"); 1858 show_options(&key->cert->extensions, v00, 0); 1859 } 1860 } 1861 exit(0); 1862 } 1863 1864 static void 1865 usage(void) 1866 { 1867 fprintf(stderr, "usage: %s [options]\n", __progname); 1868 fprintf(stderr, "Options:\n"); 1869 fprintf(stderr, " -A Generate non-existent host keys for all key types.\n"); 1870 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); 1871 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 1872 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 1873 fprintf(stderr, " -C comment Provide new comment.\n"); 1874 fprintf(stderr, " -c Change comment in private and public key files.\n"); 1875 #ifdef ENABLE_PKCS11 1876 fprintf(stderr, " -D pkcs11 Download public key from pkcs11 token.\n"); 1877 #endif 1878 fprintf(stderr, " -e Export OpenSSH to foreign format key file.\n"); 1879 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); 1880 fprintf(stderr, " -f filename Filename of the key file.\n"); 1881 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); 1882 fprintf(stderr, " -g Use generic DNS resource record format.\n"); 1883 fprintf(stderr, " -H Hash names in known_hosts file.\n"); 1884 fprintf(stderr, " -h Generate host certificate instead of a user certificate.\n"); 1885 fprintf(stderr, " -I key_id Key identifier to include in certificate.\n"); 1886 fprintf(stderr, " -i Import foreign format to OpenSSH key file.\n"); 1887 fprintf(stderr, " -L Print the contents of a certificate.\n"); 1888 fprintf(stderr, " -l Show fingerprint of key file.\n"); 1889 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); 1890 fprintf(stderr, " -m key_fmt Conversion format for -e/-i (PEM|PKCS8|RFC4716).\n"); 1891 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 1892 fprintf(stderr, " -n name,... User/host principal names to include in certificate\n"); 1893 fprintf(stderr, " -O option Specify a certificate option.\n"); 1894 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 1895 fprintf(stderr, " -p Change passphrase of private key file.\n"); 1896 fprintf(stderr, " -q Quiet.\n"); 1897 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); 1898 fprintf(stderr, " -r hostname Print DNS resource record.\n"); 1899 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); 1900 fprintf(stderr, " -s ca_key Certify keys with CA key.\n"); 1901 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); 1902 fprintf(stderr, " -t type Specify type of key to create.\n"); 1903 fprintf(stderr, " -V from:to Specify certificate validity interval.\n"); 1904 fprintf(stderr, " -v Verbose.\n"); 1905 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); 1906 fprintf(stderr, " -y Read private key file and print public key.\n"); 1907 fprintf(stderr, " -z serial Specify a serial number.\n"); 1908 1909 exit(1); 1910 } 1911 1912 /* 1913 * Main program for key management. 1914 */ 1915 int 1916 main(int argc, char **argv) 1917 { 1918 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 1919 char out_file[MAXPATHLEN], *rr_hostname = NULL; 1920 Key *private, *public; 1921 struct passwd *pw; 1922 struct stat st; 1923 int opt, type, fd; 1924 u_int32_t memory = 0, generator_wanted = 0, trials = 100; 1925 int do_gen_candidates = 0, do_screen_candidates = 0; 1926 int gen_all_hostkeys = 0; 1927 BIGNUM *start = NULL; 1928 FILE *f; 1929 const char *errstr; 1930 1931 extern int optind; 1932 extern char *optarg; 1933 1934 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 1935 sanitise_stdfd(); 1936 1937 __progname = ssh_get_progname(argv[0]); 1938 1939 OpenSSL_add_all_algorithms(); 1940 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 1941 1942 seed_rng(); 1943 1944 /* we need this for the home * directory. */ 1945 pw = getpwuid(getuid()); 1946 if (!pw) { 1947 printf("You don't exist, go away!\n"); 1948 exit(1); 1949 } 1950 if (gethostname(hostname, sizeof(hostname)) < 0) { 1951 perror("gethostname"); 1952 exit(1); 1953 } 1954 1955 while ((opt = getopt(argc, argv, "AegiqpclBHLhvxXyF:b:f:t:D:I:P:m:N:n:" 1956 "O:C:r:g:R:T:G:M:S:s:a:V:W:z:")) != -1) { 1957 switch (opt) { 1958 case 'A': 1959 gen_all_hostkeys = 1; 1960 break; 1961 case 'b': 1962 bits = (u_int32_t)strtonum(optarg, 256, 32768, &errstr); 1963 if (errstr) 1964 fatal("Bits has bad value %s (%s)", 1965 optarg, errstr); 1966 break; 1967 case 'F': 1968 find_host = 1; 1969 rr_hostname = optarg; 1970 break; 1971 case 'H': 1972 hash_hosts = 1; 1973 break; 1974 case 'I': 1975 cert_key_id = optarg; 1976 break; 1977 case 'R': 1978 delete_host = 1; 1979 rr_hostname = optarg; 1980 break; 1981 case 'L': 1982 show_cert = 1; 1983 break; 1984 case 'l': 1985 print_fingerprint = 1; 1986 break; 1987 case 'B': 1988 print_bubblebabble = 1; 1989 break; 1990 case 'm': 1991 if (strcasecmp(optarg, "RFC4716") == 0 || 1992 strcasecmp(optarg, "ssh2") == 0) { 1993 convert_format = FMT_RFC4716; 1994 break; 1995 } 1996 if (strcasecmp(optarg, "PKCS8") == 0) { 1997 convert_format = FMT_PKCS8; 1998 break; 1999 } 2000 if (strcasecmp(optarg, "PEM") == 0) { 2001 convert_format = FMT_PEM; 2002 break; 2003 } 2004 fatal("Unsupported conversion format \"%s\"", optarg); 2005 case 'n': 2006 cert_principals = optarg; 2007 break; 2008 case 'p': 2009 change_passphrase = 1; 2010 break; 2011 case 'c': 2012 change_comment = 1; 2013 break; 2014 case 'f': 2015 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= 2016 sizeof(identity_file)) 2017 fatal("Identity filename too long"); 2018 have_identity = 1; 2019 break; 2020 case 'g': 2021 print_generic = 1; 2022 break; 2023 case 'P': 2024 identity_passphrase = optarg; 2025 break; 2026 case 'N': 2027 identity_new_passphrase = optarg; 2028 break; 2029 case 'O': 2030 add_cert_option(optarg); 2031 break; 2032 case 'C': 2033 identity_comment = optarg; 2034 break; 2035 case 'q': 2036 quiet = 1; 2037 break; 2038 case 'e': 2039 case 'x': 2040 /* export key */ 2041 convert_to = 1; 2042 break; 2043 case 'h': 2044 cert_key_type = SSH2_CERT_TYPE_HOST; 2045 certflags_flags = 0; 2046 break; 2047 case 'i': 2048 case 'X': 2049 /* import key */ 2050 convert_from = 1; 2051 break; 2052 case 'y': 2053 print_public = 1; 2054 break; 2055 case 's': 2056 ca_key_path = optarg; 2057 break; 2058 case 't': 2059 key_type_name = optarg; 2060 break; 2061 case 'D': 2062 pkcs11provider = optarg; 2063 break; 2064 case 'v': 2065 if (log_level == SYSLOG_LEVEL_INFO) 2066 log_level = SYSLOG_LEVEL_DEBUG1; 2067 else { 2068 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2069 log_level < SYSLOG_LEVEL_DEBUG3) 2070 log_level++; 2071 } 2072 break; 2073 case 'r': 2074 rr_hostname = optarg; 2075 break; 2076 case 'W': 2077 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2078 UINT_MAX, &errstr); 2079 if (errstr) 2080 fatal("Desired generator has bad value: %s (%s)", 2081 optarg, errstr); 2082 break; 2083 case 'a': 2084 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2085 if (errstr) 2086 fatal("Invalid number of trials: %s (%s)", 2087 optarg, errstr); 2088 break; 2089 case 'M': 2090 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2091 if (errstr) 2092 fatal("Memory limit is %s: %s", errstr, optarg); 2093 break; 2094 case 'G': 2095 do_gen_candidates = 1; 2096 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2097 sizeof(out_file)) 2098 fatal("Output filename too long"); 2099 break; 2100 case 'T': 2101 do_screen_candidates = 1; 2102 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2103 sizeof(out_file)) 2104 fatal("Output filename too long"); 2105 break; 2106 case 'S': 2107 /* XXX - also compare length against bits */ 2108 if (BN_hex2bn(&start, optarg) == 0) 2109 fatal("Invalid start point."); 2110 break; 2111 case 'V': 2112 parse_cert_times(optarg); 2113 break; 2114 case 'z': 2115 cert_serial = strtonum(optarg, 0, LLONG_MAX, &errstr); 2116 if (errstr) 2117 fatal("Invalid serial number: %s", errstr); 2118 break; 2119 case '?': 2120 default: 2121 usage(); 2122 } 2123 } 2124 2125 /* reinit */ 2126 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2127 2128 argv += optind; 2129 argc -= optind; 2130 2131 if (ca_key_path != NULL) { 2132 if (argc < 1) { 2133 printf("Too few arguments.\n"); 2134 usage(); 2135 } 2136 } else if (argc > 0) { 2137 printf("Too many arguments.\n"); 2138 usage(); 2139 } 2140 if (change_passphrase && change_comment) { 2141 printf("Can only have one of -p and -c.\n"); 2142 usage(); 2143 } 2144 if (print_fingerprint && (delete_host || hash_hosts)) { 2145 printf("Cannot use -l with -D or -R.\n"); 2146 usage(); 2147 } 2148 if (ca_key_path != NULL) { 2149 if (cert_key_id == NULL) 2150 fatal("Must specify key id (-I) when certifying"); 2151 do_ca_sign(pw, argc, argv); 2152 } 2153 if (show_cert) 2154 do_show_cert(pw); 2155 if (delete_host || hash_hosts || find_host) 2156 do_known_hosts(pw, rr_hostname); 2157 if (print_fingerprint || print_bubblebabble) 2158 do_fingerprint(pw); 2159 if (change_passphrase) 2160 do_change_passphrase(pw); 2161 if (change_comment) 2162 do_change_comment(pw); 2163 if (convert_to) 2164 do_convert_to(pw); 2165 if (convert_from) 2166 do_convert_from(pw); 2167 if (print_public) 2168 do_print_public(pw); 2169 if (rr_hostname != NULL) { 2170 unsigned int n = 0; 2171 2172 if (have_identity) { 2173 n = do_print_resource_record(pw, 2174 identity_file, rr_hostname); 2175 if (n == 0) { 2176 perror(identity_file); 2177 exit(1); 2178 } 2179 exit(0); 2180 } else { 2181 2182 n += do_print_resource_record(pw, 2183 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2184 n += do_print_resource_record(pw, 2185 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2186 2187 if (n == 0) 2188 fatal("no keys found."); 2189 exit(0); 2190 } 2191 } 2192 if (pkcs11provider != NULL) 2193 do_download(pw); 2194 2195 if (do_gen_candidates) { 2196 FILE *out = fopen(out_file, "w"); 2197 2198 if (out == NULL) { 2199 error("Couldn't open modulus candidate file \"%s\": %s", 2200 out_file, strerror(errno)); 2201 return (1); 2202 } 2203 if (bits == 0) 2204 bits = DEFAULT_BITS; 2205 if (gen_candidates(out, memory, bits, start) != 0) 2206 fatal("modulus candidate generation failed"); 2207 2208 return (0); 2209 } 2210 2211 if (do_screen_candidates) { 2212 FILE *in; 2213 FILE *out = fopen(out_file, "w"); 2214 2215 if (have_identity && strcmp(identity_file, "-") != 0) { 2216 if ((in = fopen(identity_file, "r")) == NULL) { 2217 fatal("Couldn't open modulus candidate " 2218 "file \"%s\": %s", identity_file, 2219 strerror(errno)); 2220 } 2221 } else 2222 in = stdin; 2223 2224 if (out == NULL) { 2225 fatal("Couldn't open moduli file \"%s\": %s", 2226 out_file, strerror(errno)); 2227 } 2228 if (prime_test(in, out, trials, generator_wanted) != 0) 2229 fatal("modulus screening failed"); 2230 return (0); 2231 } 2232 2233 if (gen_all_hostkeys) { 2234 do_gen_all_hostkeys(pw); 2235 return (0); 2236 } 2237 2238 arc4random_stir(); 2239 2240 if (key_type_name == NULL) 2241 key_type_name = "rsa"; 2242 2243 type = key_type_from_name(key_type_name); 2244 type_bits_valid(type, &bits); 2245 2246 if (!quiet) 2247 printf("Generating public/private %s key pair.\n", key_type_name); 2248 private = key_generate(type, bits); 2249 if (private == NULL) { 2250 fprintf(stderr, "key_generate failed\n"); 2251 exit(1); 2252 } 2253 public = key_from_private(private); 2254 2255 if (!have_identity) 2256 ask_filename(pw, "Enter file in which to save the key"); 2257 2258 /* Create ~/.ssh directory if it doesn't already exist. */ 2259 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2260 pw->pw_dir, _PATH_SSH_USER_DIR); 2261 if (strstr(identity_file, dotsshdir) != NULL) { 2262 if (stat(dotsshdir, &st) < 0) { 2263 if (errno != ENOENT) { 2264 error("Could not stat %s: %s", dotsshdir, 2265 strerror(errno)); 2266 } else if (mkdir(dotsshdir, 0700) < 0) { 2267 error("Could not create directory '%s': %s", 2268 dotsshdir, strerror(errno)); 2269 } else if (!quiet) 2270 printf("Created directory '%s'.\n", dotsshdir); 2271 } 2272 } 2273 /* If the file already exists, ask the user to confirm. */ 2274 if (stat(identity_file, &st) >= 0) { 2275 char yesno[3]; 2276 printf("%s already exists.\n", identity_file); 2277 printf("Overwrite (y/n)? "); 2278 fflush(stdout); 2279 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2280 exit(1); 2281 if (yesno[0] != 'y' && yesno[0] != 'Y') 2282 exit(1); 2283 } 2284 /* Ask for a passphrase (twice). */ 2285 if (identity_passphrase) 2286 passphrase1 = xstrdup(identity_passphrase); 2287 else if (identity_new_passphrase) 2288 passphrase1 = xstrdup(identity_new_passphrase); 2289 else { 2290 passphrase_again: 2291 passphrase1 = 2292 read_passphrase("Enter passphrase (empty for no " 2293 "passphrase): ", RP_ALLOW_STDIN); 2294 passphrase2 = read_passphrase("Enter same passphrase again: ", 2295 RP_ALLOW_STDIN); 2296 if (strcmp(passphrase1, passphrase2) != 0) { 2297 /* 2298 * The passphrases do not match. Clear them and 2299 * retry. 2300 */ 2301 memset(passphrase1, 0, strlen(passphrase1)); 2302 memset(passphrase2, 0, strlen(passphrase2)); 2303 xfree(passphrase1); 2304 xfree(passphrase2); 2305 printf("Passphrases do not match. Try again.\n"); 2306 goto passphrase_again; 2307 } 2308 /* Clear the other copy of the passphrase. */ 2309 memset(passphrase2, 0, strlen(passphrase2)); 2310 xfree(passphrase2); 2311 } 2312 2313 if (identity_comment) { 2314 strlcpy(comment, identity_comment, sizeof(comment)); 2315 } else { 2316 /* Create default comment field for the passphrase. */ 2317 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2318 } 2319 2320 /* Save the key with the given passphrase and comment. */ 2321 if (!key_save_private(private, identity_file, passphrase1, comment)) { 2322 printf("Saving the key failed: %s.\n", identity_file); 2323 memset(passphrase1, 0, strlen(passphrase1)); 2324 xfree(passphrase1); 2325 exit(1); 2326 } 2327 /* Clear the passphrase. */ 2328 memset(passphrase1, 0, strlen(passphrase1)); 2329 xfree(passphrase1); 2330 2331 /* Clear the private key and the random number generator. */ 2332 key_free(private); 2333 arc4random_stir(); 2334 2335 if (!quiet) 2336 printf("Your identification has been saved in %s.\n", identity_file); 2337 2338 strlcat(identity_file, ".pub", sizeof(identity_file)); 2339 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 2340 if (fd == -1) { 2341 printf("Could not save your public key in %s\n", identity_file); 2342 exit(1); 2343 } 2344 f = fdopen(fd, "w"); 2345 if (f == NULL) { 2346 printf("fdopen %s failed\n", identity_file); 2347 exit(1); 2348 } 2349 if (!key_write(public, f)) 2350 fprintf(stderr, "write key failed\n"); 2351 fprintf(f, " %s\n", comment); 2352 fclose(f); 2353 2354 if (!quiet) { 2355 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 2356 char *ra = key_fingerprint(public, SSH_FP_MD5, 2357 SSH_FP_RANDOMART); 2358 printf("Your public key has been saved in %s.\n", 2359 identity_file); 2360 printf("The key fingerprint is:\n"); 2361 printf("%s %s\n", fp, comment); 2362 printf("The key's randomart image is:\n"); 2363 printf("%s\n", ra); 2364 xfree(ra); 2365 xfree(fp); 2366 } 2367 2368 key_free(public); 2369 exit(0); 2370 } 2371
