ssh-keygen.c revision 247485
1/* $OpenBSD: ssh-keygen.c,v 1.216 2012/07/06 06:38:03 jmc 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#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 58u_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 */ 64int 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 */ 70int change_comment = 0; 71 72int quiet = 0; 73 74int log_level = SYSLOG_LEVEL_INFO; 75 76/* Flag indicating that we want to hash a known_hosts file */ 77int hash_hosts = 0; 78/* Flag indicating that we want lookup a host in known_hosts file */ 79int find_host = 0; 80/* Flag indicating that we want to delete a host from a known_hosts file */ 81int delete_host = 0; 82 83/* Flag indicating that we want to show the contents of a certificate */ 84int show_cert = 0; 85 86/* Flag indicating that we just want to see the key fingerprint */ 87int print_fingerprint = 0; 88int print_bubblebabble = 0; 89 90/* The identity file name, given on the command line or entered by the user. */ 91char identity_file[1024]; 92int have_identity = 0; 93 94/* This is set to the passphrase if given on the command line. */ 95char *identity_passphrase = NULL; 96 97/* This is set to the new passphrase if given on the command line. */ 98char *identity_new_passphrase = NULL; 99 100/* This is set to the new comment if given on the command line. */ 101char *identity_comment = NULL; 102 103/* Path to CA key when certifying keys. */ 104char *ca_key_path = NULL; 105 106/* Certificate serial number */ 107long long cert_serial = 0; 108 109/* Key type when certifying */ 110u_int cert_key_type = SSH2_CERT_TYPE_USER; 111 112/* "key ID" of signed key */ 113char *cert_key_id = NULL; 114 115/* Comma-separated list of principal names for certifying keys */ 116char *cert_principals = NULL; 117 118/* Validity period for certificates */ 119u_int64_t cert_valid_from = 0; 120u_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) 130u_int32_t certflags_flags = CERTOPT_DEFAULT; 131char *certflags_command = NULL; 132char *certflags_src_addr = NULL; 133 134/* Conversion to/from various formats */ 135int convert_to = 0; 136int convert_from = 0; 137enum { 138 FMT_RFC4716, 139 FMT_PKCS8, 140 FMT_PEM 141} convert_format = FMT_RFC4716; 142int print_public = 0; 143int print_generic = 0; 144 145char *key_type_name = NULL; 146 147/* Load key from this PKCS#11 provider */ 148char *pkcs11provider = NULL; 149 150/* argv0 */ 151extern char *__progname; 152 153char hostname[MAXHOSTNAMELEN]; 154 155/* moduli.c */ 156int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 157int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 158 unsigned long); 159 160static void 161type_bits_valid(int type, u_int32_t *bitsp) 162{ 163 u_int maxbits; 164 165 if (type == KEY_UNSPEC) { 166 fprintf(stderr, "unknown key type %s\n", key_type_name); 167 exit(1); 168 } 169 if (*bitsp == 0) { 170 if (type == KEY_DSA) 171 *bitsp = DEFAULT_BITS_DSA; 172 else if (type == KEY_ECDSA) 173 *bitsp = DEFAULT_BITS_ECDSA; 174 else 175 *bitsp = DEFAULT_BITS; 176 } 177 maxbits = (type == KEY_DSA) ? 178 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 179 if (*bitsp > maxbits) { 180 fprintf(stderr, "key bits exceeds maximum %d\n", maxbits); 181 exit(1); 182 } 183 if (type == KEY_DSA && *bitsp != 1024) 184 fatal("DSA keys must be 1024 bits"); 185 else if (type != KEY_ECDSA && *bitsp < 768) 186 fatal("Key must at least be 768 bits"); 187 else if (type == KEY_ECDSA && key_ecdsa_bits_to_nid(*bitsp) == -1) 188 fatal("Invalid ECDSA key length - valid lengths are " 189 "256, 384 or 521 bits"); 190} 191 192static void 193ask_filename(struct passwd *pw, const char *prompt) 194{ 195 char buf[1024]; 196 char *name = NULL; 197 198 if (key_type_name == NULL) 199 name = _PATH_SSH_CLIENT_ID_RSA; 200 else { 201 switch (key_type_from_name(key_type_name)) { 202 case KEY_RSA1: 203 name = _PATH_SSH_CLIENT_IDENTITY; 204 break; 205 case KEY_DSA_CERT: 206 case KEY_DSA_CERT_V00: 207 case KEY_DSA: 208 name = _PATH_SSH_CLIENT_ID_DSA; 209 break; 210#ifdef OPENSSL_HAS_ECC 211 case KEY_ECDSA_CERT: 212 case KEY_ECDSA: 213 name = _PATH_SSH_CLIENT_ID_ECDSA; 214 break; 215#endif 216 case KEY_RSA_CERT: 217 case KEY_RSA_CERT_V00: 218 case KEY_RSA: 219 name = _PATH_SSH_CLIENT_ID_RSA; 220 break; 221 default: 222 fprintf(stderr, "bad key type\n"); 223 exit(1); 224 break; 225 } 226 } 227 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 228 fprintf(stderr, "%s (%s): ", prompt, identity_file); 229 if (fgets(buf, sizeof(buf), stdin) == NULL) 230 exit(1); 231 buf[strcspn(buf, "\n")] = '\0'; 232 if (strcmp(buf, "") != 0) 233 strlcpy(identity_file, buf, sizeof(identity_file)); 234 have_identity = 1; 235} 236 237static Key * 238load_identity(char *filename) 239{ 240 char *pass; 241 Key *prv; 242 243 prv = key_load_private(filename, "", NULL); 244 if (prv == NULL) { 245 if (identity_passphrase) 246 pass = xstrdup(identity_passphrase); 247 else 248 pass = read_passphrase("Enter passphrase: ", 249 RP_ALLOW_STDIN); 250 prv = key_load_private(filename, pass, NULL); 251 memset(pass, 0, strlen(pass)); 252 xfree(pass); 253 } 254 return prv; 255} 256 257#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 258#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 259#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 260#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 261 262static void 263do_convert_to_ssh2(struct passwd *pw, Key *k) 264{ 265 u_int len; 266 u_char *blob; 267 char comment[61]; 268 269 if (k->type == KEY_RSA1) { 270 fprintf(stderr, "version 1 keys are not supported\n"); 271 exit(1); 272 } 273 if (key_to_blob(k, &blob, &len) <= 0) { 274 fprintf(stderr, "key_to_blob failed\n"); 275 exit(1); 276 } 277 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 278 snprintf(comment, sizeof(comment), 279 "%u-bit %s, converted by %s@%s from OpenSSH", 280 key_size(k), key_type(k), 281 pw->pw_name, hostname); 282 283 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 284 fprintf(stdout, "Comment: \"%s\"\n", comment); 285 dump_base64(stdout, blob, len); 286 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 287 key_free(k); 288 xfree(blob); 289 exit(0); 290} 291 292static void 293do_convert_to_pkcs8(Key *k) 294{ 295 switch (key_type_plain(k->type)) { 296 case KEY_RSA1: 297 case KEY_RSA: 298 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 299 fatal("PEM_write_RSA_PUBKEY failed"); 300 break; 301 case KEY_DSA: 302 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 303 fatal("PEM_write_DSA_PUBKEY failed"); 304 break; 305#ifdef OPENSSL_HAS_ECC 306 case KEY_ECDSA: 307 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 308 fatal("PEM_write_EC_PUBKEY failed"); 309 break; 310#endif 311 default: 312 fatal("%s: unsupported key type %s", __func__, key_type(k)); 313 } 314 exit(0); 315} 316 317static void 318do_convert_to_pem(Key *k) 319{ 320 switch (key_type_plain(k->type)) { 321 case KEY_RSA1: 322 case KEY_RSA: 323 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 324 fatal("PEM_write_RSAPublicKey failed"); 325 break; 326#if notyet /* OpenSSH 0.9.8 lacks this function */ 327 case KEY_DSA: 328 if (!PEM_write_DSAPublicKey(stdout, k->dsa)) 329 fatal("PEM_write_DSAPublicKey failed"); 330 break; 331#endif 332 /* XXX ECDSA? */ 333 default: 334 fatal("%s: unsupported key type %s", __func__, key_type(k)); 335 } 336 exit(0); 337} 338 339static void 340do_convert_to(struct passwd *pw) 341{ 342 Key *k; 343 struct stat st; 344 345 if (!have_identity) 346 ask_filename(pw, "Enter file in which the key is"); 347 if (stat(identity_file, &st) < 0) 348 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 349 if ((k = key_load_public(identity_file, NULL)) == NULL) { 350 if ((k = load_identity(identity_file)) == NULL) { 351 fprintf(stderr, "load failed\n"); 352 exit(1); 353 } 354 } 355 356 switch (convert_format) { 357 case FMT_RFC4716: 358 do_convert_to_ssh2(pw, k); 359 break; 360 case FMT_PKCS8: 361 do_convert_to_pkcs8(k); 362 break; 363 case FMT_PEM: 364 do_convert_to_pem(k); 365 break; 366 default: 367 fatal("%s: unknown key format %d", __func__, convert_format); 368 } 369 exit(0); 370} 371 372static void 373buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 374{ 375 u_int bignum_bits = buffer_get_int(b); 376 u_int bytes = (bignum_bits + 7) / 8; 377 378 if (buffer_len(b) < bytes) 379 fatal("buffer_get_bignum_bits: input buffer too small: " 380 "need %d have %d", bytes, buffer_len(b)); 381 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL) 382 fatal("buffer_get_bignum_bits: BN_bin2bn failed"); 383 buffer_consume(b, bytes); 384} 385 386static Key * 387do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 388{ 389 Buffer b; 390 Key *key = NULL; 391 char *type, *cipher; 392 u_char *sig, data[] = "abcde12345"; 393 int magic, rlen, ktype, i1, i2, i3, i4; 394 u_int slen; 395 u_long e; 396 397 buffer_init(&b); 398 buffer_append(&b, blob, blen); 399 400 magic = buffer_get_int(&b); 401 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 402 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 403 buffer_free(&b); 404 return NULL; 405 } 406 i1 = buffer_get_int(&b); 407 type = buffer_get_string(&b, NULL); 408 cipher = buffer_get_string(&b, NULL); 409 i2 = buffer_get_int(&b); 410 i3 = buffer_get_int(&b); 411 i4 = buffer_get_int(&b); 412 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 413 if (strcmp(cipher, "none") != 0) { 414 error("unsupported cipher %s", cipher); 415 xfree(cipher); 416 buffer_free(&b); 417 xfree(type); 418 return NULL; 419 } 420 xfree(cipher); 421 422 if (strstr(type, "dsa")) { 423 ktype = KEY_DSA; 424 } else if (strstr(type, "rsa")) { 425 ktype = KEY_RSA; 426 } else { 427 buffer_free(&b); 428 xfree(type); 429 return NULL; 430 } 431 key = key_new_private(ktype); 432 xfree(type); 433 434 switch (key->type) { 435 case KEY_DSA: 436 buffer_get_bignum_bits(&b, key->dsa->p); 437 buffer_get_bignum_bits(&b, key->dsa->g); 438 buffer_get_bignum_bits(&b, key->dsa->q); 439 buffer_get_bignum_bits(&b, key->dsa->pub_key); 440 buffer_get_bignum_bits(&b, key->dsa->priv_key); 441 break; 442 case KEY_RSA: 443 e = buffer_get_char(&b); 444 debug("e %lx", e); 445 if (e < 30) { 446 e <<= 8; 447 e += buffer_get_char(&b); 448 debug("e %lx", e); 449 e <<= 8; 450 e += buffer_get_char(&b); 451 debug("e %lx", e); 452 } 453 if (!BN_set_word(key->rsa->e, e)) { 454 buffer_free(&b); 455 key_free(key); 456 return NULL; 457 } 458 buffer_get_bignum_bits(&b, key->rsa->d); 459 buffer_get_bignum_bits(&b, key->rsa->n); 460 buffer_get_bignum_bits(&b, key->rsa->iqmp); 461 buffer_get_bignum_bits(&b, key->rsa->q); 462 buffer_get_bignum_bits(&b, key->rsa->p); 463 rsa_generate_additional_parameters(key->rsa); 464 break; 465 } 466 rlen = buffer_len(&b); 467 if (rlen != 0) 468 error("do_convert_private_ssh2_from_blob: " 469 "remaining bytes in key blob %d", rlen); 470 buffer_free(&b); 471 472 /* try the key */ 473 key_sign(key, &sig, &slen, data, sizeof(data)); 474 key_verify(key, sig, slen, data, sizeof(data)); 475 xfree(sig); 476 return key; 477} 478 479static int 480get_line(FILE *fp, char *line, size_t len) 481{ 482 int c; 483 size_t pos = 0; 484 485 line[0] = '\0'; 486 while ((c = fgetc(fp)) != EOF) { 487 if (pos >= len - 1) { 488 fprintf(stderr, "input line too long.\n"); 489 exit(1); 490 } 491 switch (c) { 492 case '\r': 493 c = fgetc(fp); 494 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { 495 fprintf(stderr, "unget: %s\n", strerror(errno)); 496 exit(1); 497 } 498 return pos; 499 case '\n': 500 return pos; 501 } 502 line[pos++] = c; 503 line[pos] = '\0'; 504 } 505 /* We reached EOF */ 506 return -1; 507} 508 509static void 510do_convert_from_ssh2(struct passwd *pw, Key **k, int *private) 511{ 512 int blen; 513 u_int len; 514 char line[1024]; 515 u_char blob[8096]; 516 char encoded[8096]; 517 int escaped = 0; 518 FILE *fp; 519 520 if ((fp = fopen(identity_file, "r")) == NULL) 521 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 522 encoded[0] = '\0'; 523 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 524 if (line[blen - 1] == '\\') 525 escaped++; 526 if (strncmp(line, "----", 4) == 0 || 527 strstr(line, ": ") != NULL) { 528 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 529 *private = 1; 530 if (strstr(line, " END ") != NULL) { 531 break; 532 } 533 /* fprintf(stderr, "ignore: %s", line); */ 534 continue; 535 } 536 if (escaped) { 537 escaped--; 538 /* fprintf(stderr, "escaped: %s", line); */ 539 continue; 540 } 541 strlcat(encoded, line, sizeof(encoded)); 542 } 543 len = strlen(encoded); 544 if (((len % 4) == 3) && 545 (encoded[len-1] == '=') && 546 (encoded[len-2] == '=') && 547 (encoded[len-3] == '=')) 548 encoded[len-3] = '\0'; 549 blen = uudecode(encoded, blob, sizeof(blob)); 550 if (blen < 0) { 551 fprintf(stderr, "uudecode failed.\n"); 552 exit(1); 553 } 554 *k = *private ? 555 do_convert_private_ssh2_from_blob(blob, blen) : 556 key_from_blob(blob, blen); 557 if (*k == NULL) { 558 fprintf(stderr, "decode blob failed.\n"); 559 exit(1); 560 } 561 fclose(fp); 562} 563 564static void 565do_convert_from_pkcs8(Key **k, int *private) 566{ 567 EVP_PKEY *pubkey; 568 FILE *fp; 569 570 if ((fp = fopen(identity_file, "r")) == NULL) 571 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 572 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 573 fatal("%s: %s is not a recognised public key format", __func__, 574 identity_file); 575 } 576 fclose(fp); 577 switch (EVP_PKEY_type(pubkey->type)) { 578 case EVP_PKEY_RSA: 579 *k = key_new(KEY_UNSPEC); 580 (*k)->type = KEY_RSA; 581 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 582 break; 583 case EVP_PKEY_DSA: 584 *k = key_new(KEY_UNSPEC); 585 (*k)->type = KEY_DSA; 586 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 587 break; 588#ifdef OPENSSL_HAS_ECC 589 case EVP_PKEY_EC: 590 *k = key_new(KEY_UNSPEC); 591 (*k)->type = KEY_ECDSA; 592 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 593 (*k)->ecdsa_nid = key_ecdsa_key_to_nid((*k)->ecdsa); 594 break; 595#endif 596 default: 597 fatal("%s: unsupported pubkey type %d", __func__, 598 EVP_PKEY_type(pubkey->type)); 599 } 600 EVP_PKEY_free(pubkey); 601 return; 602} 603 604static void 605do_convert_from_pem(Key **k, int *private) 606{ 607 FILE *fp; 608 RSA *rsa; 609#ifdef notyet 610 DSA *dsa; 611#endif 612 613 if ((fp = fopen(identity_file, "r")) == NULL) 614 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 615 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 616 *k = key_new(KEY_UNSPEC); 617 (*k)->type = KEY_RSA; 618 (*k)->rsa = rsa; 619 fclose(fp); 620 return; 621 } 622#if notyet /* OpenSSH 0.9.8 lacks this function */ 623 rewind(fp); 624 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 625 *k = key_new(KEY_UNSPEC); 626 (*k)->type = KEY_DSA; 627 (*k)->dsa = dsa; 628 fclose(fp); 629 return; 630 } 631 /* XXX ECDSA */ 632#endif 633 fatal("%s: unrecognised raw private key format", __func__); 634} 635 636static void 637do_convert_from(struct passwd *pw) 638{ 639 Key *k = NULL; 640 int private = 0, ok = 0; 641 struct stat st; 642 643 if (!have_identity) 644 ask_filename(pw, "Enter file in which the key is"); 645 if (stat(identity_file, &st) < 0) 646 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 647 648 switch (convert_format) { 649 case FMT_RFC4716: 650 do_convert_from_ssh2(pw, &k, &private); 651 break; 652 case FMT_PKCS8: 653 do_convert_from_pkcs8(&k, &private); 654 break; 655 case FMT_PEM: 656 do_convert_from_pem(&k, &private); 657 break; 658 default: 659 fatal("%s: unknown key format %d", __func__, convert_format); 660 } 661 662 if (!private) 663 ok = key_write(k, stdout); 664 if (ok) 665 fprintf(stdout, "\n"); 666 else { 667 switch (k->type) { 668 case KEY_DSA: 669 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 670 NULL, 0, NULL, NULL); 671 break; 672#ifdef OPENSSL_HAS_ECC 673 case KEY_ECDSA: 674 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 675 NULL, 0, NULL, NULL); 676 break; 677#endif 678 case KEY_RSA: 679 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 680 NULL, 0, NULL, NULL); 681 break; 682 default: 683 fatal("%s: unsupported key type %s", __func__, 684 key_type(k)); 685 } 686 } 687 688 if (!ok) { 689 fprintf(stderr, "key write failed\n"); 690 exit(1); 691 } 692 key_free(k); 693 exit(0); 694} 695 696static void 697do_print_public(struct passwd *pw) 698{ 699 Key *prv; 700 struct stat st; 701 702 if (!have_identity) 703 ask_filename(pw, "Enter file in which the key is"); 704 if (stat(identity_file, &st) < 0) { 705 perror(identity_file); 706 exit(1); 707 } 708 prv = load_identity(identity_file); 709 if (prv == NULL) { 710 fprintf(stderr, "load failed\n"); 711 exit(1); 712 } 713 if (!key_write(prv, stdout)) 714 fprintf(stderr, "key_write failed"); 715 key_free(prv); 716 fprintf(stdout, "\n"); 717 exit(0); 718} 719 720static void 721do_download(struct passwd *pw) 722{ 723#ifdef ENABLE_PKCS11 724 Key **keys = NULL; 725 int i, nkeys; 726 727 pkcs11_init(0); 728 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 729 if (nkeys <= 0) 730 fatal("cannot read public key from pkcs11"); 731 for (i = 0; i < nkeys; i++) { 732 key_write(keys[i], stdout); 733 key_free(keys[i]); 734 fprintf(stdout, "\n"); 735 } 736 xfree(keys); 737 pkcs11_terminate(); 738 exit(0); 739#else 740 fatal("no pkcs11 support"); 741#endif /* ENABLE_PKCS11 */ 742} 743 744static void 745do_fingerprint(struct passwd *pw) 746{ 747 FILE *f; 748 Key *public; 749 char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra; 750 int i, skip = 0, num = 0, invalid = 1; 751 enum fp_rep rep; 752 enum fp_type fptype; 753 struct stat st; 754 755 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 756 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 757 758 if (!have_identity) 759 ask_filename(pw, "Enter file in which the key is"); 760 if (stat(identity_file, &st) < 0) { 761 perror(identity_file); 762 exit(1); 763 } 764 public = key_load_public(identity_file, &comment); 765 if (public != NULL) { 766 fp = key_fingerprint(public, fptype, rep); 767 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 768 printf("%u %s %s (%s)\n", key_size(public), fp, comment, 769 key_type(public)); 770 if (log_level >= SYSLOG_LEVEL_VERBOSE) 771 printf("%s\n", ra); 772 key_free(public); 773 xfree(comment); 774 xfree(ra); 775 xfree(fp); 776 exit(0); 777 } 778 if (comment) { 779 xfree(comment); 780 comment = NULL; 781 } 782 783 if ((f = fopen(identity_file, "r")) == NULL) 784 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 785 786 while (fgets(line, sizeof(line), f)) { 787 if ((cp = strchr(line, '\n')) == NULL) { 788 error("line %d too long: %.40s...", 789 num + 1, line); 790 skip = 1; 791 continue; 792 } 793 num++; 794 if (skip) { 795 skip = 0; 796 continue; 797 } 798 *cp = '\0'; 799 800 /* Skip leading whitespace, empty and comment lines. */ 801 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 802 ; 803 if (!*cp || *cp == '\n' || *cp == '#') 804 continue; 805 i = strtol(cp, &ep, 10); 806 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 807 int quoted = 0; 808 comment = cp; 809 for (; *cp && (quoted || (*cp != ' ' && 810 *cp != '\t')); cp++) { 811 if (*cp == '\\' && cp[1] == '"') 812 cp++; /* Skip both */ 813 else if (*cp == '"') 814 quoted = !quoted; 815 } 816 if (!*cp) 817 continue; 818 *cp++ = '\0'; 819 } 820 ep = cp; 821 public = key_new(KEY_RSA1); 822 if (key_read(public, &cp) != 1) { 823 cp = ep; 824 key_free(public); 825 public = key_new(KEY_UNSPEC); 826 if (key_read(public, &cp) != 1) { 827 key_free(public); 828 continue; 829 } 830 } 831 comment = *cp ? cp : comment; 832 fp = key_fingerprint(public, fptype, rep); 833 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 834 printf("%u %s %s (%s)\n", key_size(public), fp, 835 comment ? comment : "no comment", key_type(public)); 836 if (log_level >= SYSLOG_LEVEL_VERBOSE) 837 printf("%s\n", ra); 838 xfree(ra); 839 xfree(fp); 840 key_free(public); 841 invalid = 0; 842 } 843 fclose(f); 844 845 if (invalid) { 846 printf("%s is not a public key file.\n", identity_file); 847 exit(1); 848 } 849 exit(0); 850} 851 852static void 853do_gen_all_hostkeys(struct passwd *pw) 854{ 855 struct { 856 char *key_type; 857 char *key_type_display; 858 char *path; 859 } key_types[] = { 860 { "rsa1", "RSA1", _PATH_HOST_KEY_FILE }, 861 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 862 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 863#ifdef OPENSSL_HAS_ECC 864 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 865#endif 866 { NULL, NULL, NULL } 867 }; 868 869 int first = 0; 870 struct stat st; 871 Key *private, *public; 872 char comment[1024]; 873 int i, type, fd; 874 FILE *f; 875 876 for (i = 0; key_types[i].key_type; i++) { 877 if (stat(key_types[i].path, &st) == 0) 878 continue; 879 if (errno != ENOENT) { 880 printf("Could not stat %s: %s", key_types[i].path, 881 strerror(errno)); 882 first = 0; 883 continue; 884 } 885 886 if (first == 0) { 887 first = 1; 888 printf("%s: generating new host keys: ", __progname); 889 } 890 printf("%s ", key_types[i].key_type_display); 891 fflush(stdout); 892 arc4random_stir(); 893 type = key_type_from_name(key_types[i].key_type); 894 strlcpy(identity_file, key_types[i].path, sizeof(identity_file)); 895 bits = 0; 896 type_bits_valid(type, &bits); 897 private = key_generate(type, bits); 898 if (private == NULL) { 899 fprintf(stderr, "key_generate failed\n"); 900 first = 0; 901 continue; 902 } 903 public = key_from_private(private); 904 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 905 hostname); 906 if (!key_save_private(private, identity_file, "", comment)) { 907 printf("Saving the key failed: %s.\n", identity_file); 908 key_free(private); 909 key_free(public); 910 first = 0; 911 continue; 912 } 913 key_free(private); 914 arc4random_stir(); 915 strlcat(identity_file, ".pub", sizeof(identity_file)); 916 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 917 if (fd == -1) { 918 printf("Could not save your public key in %s\n", 919 identity_file); 920 key_free(public); 921 first = 0; 922 continue; 923 } 924 f = fdopen(fd, "w"); 925 if (f == NULL) { 926 printf("fdopen %s failed\n", identity_file); 927 key_free(public); 928 first = 0; 929 continue; 930 } 931 if (!key_write(public, f)) { 932 fprintf(stderr, "write key failed\n"); 933 key_free(public); 934 first = 0; 935 continue; 936 } 937 fprintf(f, " %s\n", comment); 938 fclose(f); 939 key_free(public); 940 941 } 942 if (first != 0) 943 printf("\n"); 944} 945 946static void 947printhost(FILE *f, const char *name, Key *public, int ca, int hash) 948{ 949 if (print_fingerprint) { 950 enum fp_rep rep; 951 enum fp_type fptype; 952 char *fp, *ra; 953 954 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 955 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 956 fp = key_fingerprint(public, fptype, rep); 957 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 958 printf("%u %s %s (%s)\n", key_size(public), fp, name, 959 key_type(public)); 960 if (log_level >= SYSLOG_LEVEL_VERBOSE) 961 printf("%s\n", ra); 962 xfree(ra); 963 xfree(fp); 964 } else { 965 if (hash && (name = host_hash(name, NULL, 0)) == NULL) 966 fatal("hash_host failed"); 967 fprintf(f, "%s%s%s ", ca ? CA_MARKER : "", ca ? " " : "", name); 968 if (!key_write(public, f)) 969 fatal("key_write failed"); 970 fprintf(f, "\n"); 971 } 972} 973 974static void 975do_known_hosts(struct passwd *pw, const char *name) 976{ 977 FILE *in, *out = stdout; 978 Key *pub; 979 char *cp, *cp2, *kp, *kp2; 980 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; 981 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; 982 int ca; 983 984 if (!have_identity) { 985 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 986 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 987 sizeof(identity_file)) 988 fatal("Specified known hosts path too long"); 989 xfree(cp); 990 have_identity = 1; 991 } 992 if ((in = fopen(identity_file, "r")) == NULL) 993 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 994 995 /* 996 * Find hosts goes to stdout, hash and deletions happen in-place 997 * A corner case is ssh-keygen -HF foo, which should go to stdout 998 */ 999 if (!find_host && (hash_hosts || delete_host)) { 1000 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1001 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1002 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1003 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1004 fatal("known_hosts path too long"); 1005 umask(077); 1006 if ((c = mkstemp(tmp)) == -1) 1007 fatal("mkstemp: %s", strerror(errno)); 1008 if ((out = fdopen(c, "w")) == NULL) { 1009 c = errno; 1010 unlink(tmp); 1011 fatal("fdopen: %s", strerror(c)); 1012 } 1013 inplace = 1; 1014 } 1015 1016 while (fgets(line, sizeof(line), in)) { 1017 if ((cp = strchr(line, '\n')) == NULL) { 1018 error("line %d too long: %.40s...", num + 1, line); 1019 skip = 1; 1020 invalid = 1; 1021 continue; 1022 } 1023 num++; 1024 if (skip) { 1025 skip = 0; 1026 continue; 1027 } 1028 *cp = '\0'; 1029 1030 /* Skip leading whitespace, empty and comment lines. */ 1031 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 1032 ; 1033 if (!*cp || *cp == '\n' || *cp == '#') { 1034 if (inplace) 1035 fprintf(out, "%s\n", cp); 1036 continue; 1037 } 1038 /* Check whether this is a CA key */ 1039 if (strncasecmp(cp, CA_MARKER, sizeof(CA_MARKER) - 1) == 0 && 1040 (cp[sizeof(CA_MARKER) - 1] == ' ' || 1041 cp[sizeof(CA_MARKER) - 1] == '\t')) { 1042 ca = 1; 1043 cp += sizeof(CA_MARKER); 1044 } else 1045 ca = 0; 1046 1047 /* Find the end of the host name portion. */ 1048 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) 1049 ; 1050 1051 if (*kp == '\0' || *(kp + 1) == '\0') { 1052 error("line %d missing key: %.40s...", 1053 num, line); 1054 invalid = 1; 1055 continue; 1056 } 1057 *kp++ = '\0'; 1058 kp2 = kp; 1059 1060 pub = key_new(KEY_RSA1); 1061 if (key_read(pub, &kp) != 1) { 1062 kp = kp2; 1063 key_free(pub); 1064 pub = key_new(KEY_UNSPEC); 1065 if (key_read(pub, &kp) != 1) { 1066 error("line %d invalid key: %.40s...", 1067 num, line); 1068 key_free(pub); 1069 invalid = 1; 1070 continue; 1071 } 1072 } 1073 1074 if (*cp == HASH_DELIM) { 1075 if (find_host || delete_host) { 1076 cp2 = host_hash(name, cp, strlen(cp)); 1077 if (cp2 == NULL) { 1078 error("line %d: invalid hashed " 1079 "name: %.64s...", num, line); 1080 invalid = 1; 1081 continue; 1082 } 1083 c = (strcmp(cp2, cp) == 0); 1084 if (find_host && c) { 1085 printf("# Host %s found: " 1086 "line %d type %s%s\n", name, 1087 num, key_type(pub), 1088 ca ? " (CA key)" : ""); 1089 printhost(out, cp, pub, ca, 0); 1090 } 1091 if (delete_host && !c && !ca) 1092 printhost(out, cp, pub, ca, 0); 1093 } else if (hash_hosts) 1094 printhost(out, cp, pub, ca, 0); 1095 } else { 1096 if (find_host || delete_host) { 1097 c = (match_hostname(name, cp, 1098 strlen(cp)) == 1); 1099 if (find_host && c) { 1100 printf("# Host %s found: " 1101 "line %d type %s%s\n", name, 1102 num, key_type(pub), 1103 ca ? " (CA key)" : ""); 1104 printhost(out, name, pub, 1105 ca, hash_hosts && !ca); 1106 } 1107 if (delete_host && !c && !ca) 1108 printhost(out, cp, pub, ca, 0); 1109 } else if (hash_hosts) { 1110 for (cp2 = strsep(&cp, ","); 1111 cp2 != NULL && *cp2 != '\0'; 1112 cp2 = strsep(&cp, ",")) { 1113 if (ca) { 1114 fprintf(stderr, "Warning: " 1115 "ignoring CA key for host: " 1116 "%.64s\n", cp2); 1117 printhost(out, cp2, pub, ca, 0); 1118 } else if (strcspn(cp2, "*?!") != 1119 strlen(cp2)) { 1120 fprintf(stderr, "Warning: " 1121 "ignoring host name with " 1122 "metacharacters: %.64s\n", 1123 cp2); 1124 printhost(out, cp2, pub, ca, 0); 1125 } else 1126 printhost(out, cp2, pub, ca, 1); 1127 } 1128 has_unhashed = 1; 1129 } 1130 } 1131 key_free(pub); 1132 } 1133 fclose(in); 1134 1135 if (invalid) { 1136 fprintf(stderr, "%s is not a valid known_hosts file.\n", 1137 identity_file); 1138 if (inplace) { 1139 fprintf(stderr, "Not replacing existing known_hosts " 1140 "file because of errors\n"); 1141 fclose(out); 1142 unlink(tmp); 1143 } 1144 exit(1); 1145 } 1146 1147 if (inplace) { 1148 fclose(out); 1149 1150 /* Backup existing file */ 1151 if (unlink(old) == -1 && errno != ENOENT) 1152 fatal("unlink %.100s: %s", old, strerror(errno)); 1153 if (link(identity_file, old) == -1) 1154 fatal("link %.100s to %.100s: %s", identity_file, old, 1155 strerror(errno)); 1156 /* Move new one into place */ 1157 if (rename(tmp, identity_file) == -1) { 1158 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1159 strerror(errno)); 1160 unlink(tmp); 1161 unlink(old); 1162 exit(1); 1163 } 1164 1165 fprintf(stderr, "%s updated.\n", identity_file); 1166 fprintf(stderr, "Original contents retained as %s\n", old); 1167 if (has_unhashed) { 1168 fprintf(stderr, "WARNING: %s contains unhashed " 1169 "entries\n", old); 1170 fprintf(stderr, "Delete this file to ensure privacy " 1171 "of hostnames\n"); 1172 } 1173 } 1174 1175 exit(0); 1176} 1177 1178/* 1179 * Perform changing a passphrase. The argument is the passwd structure 1180 * for the current user. 1181 */ 1182static void 1183do_change_passphrase(struct passwd *pw) 1184{ 1185 char *comment; 1186 char *old_passphrase, *passphrase1, *passphrase2; 1187 struct stat st; 1188 Key *private; 1189 1190 if (!have_identity) 1191 ask_filename(pw, "Enter file in which the key is"); 1192 if (stat(identity_file, &st) < 0) { 1193 perror(identity_file); 1194 exit(1); 1195 } 1196 /* Try to load the file with empty passphrase. */ 1197 private = key_load_private(identity_file, "", &comment); 1198 if (private == NULL) { 1199 if (identity_passphrase) 1200 old_passphrase = xstrdup(identity_passphrase); 1201 else 1202 old_passphrase = 1203 read_passphrase("Enter old passphrase: ", 1204 RP_ALLOW_STDIN); 1205 private = key_load_private(identity_file, old_passphrase, 1206 &comment); 1207 memset(old_passphrase, 0, strlen(old_passphrase)); 1208 xfree(old_passphrase); 1209 if (private == NULL) { 1210 printf("Bad passphrase.\n"); 1211 exit(1); 1212 } 1213 } 1214 printf("Key has comment '%s'\n", comment); 1215 1216 /* Ask the new passphrase (twice). */ 1217 if (identity_new_passphrase) { 1218 passphrase1 = xstrdup(identity_new_passphrase); 1219 passphrase2 = NULL; 1220 } else { 1221 passphrase1 = 1222 read_passphrase("Enter new passphrase (empty for no " 1223 "passphrase): ", RP_ALLOW_STDIN); 1224 passphrase2 = read_passphrase("Enter same passphrase again: ", 1225 RP_ALLOW_STDIN); 1226 1227 /* Verify that they are the same. */ 1228 if (strcmp(passphrase1, passphrase2) != 0) { 1229 memset(passphrase1, 0, strlen(passphrase1)); 1230 memset(passphrase2, 0, strlen(passphrase2)); 1231 xfree(passphrase1); 1232 xfree(passphrase2); 1233 printf("Pass phrases do not match. Try again.\n"); 1234 exit(1); 1235 } 1236 /* Destroy the other copy. */ 1237 memset(passphrase2, 0, strlen(passphrase2)); 1238 xfree(passphrase2); 1239 } 1240 1241 /* Save the file using the new passphrase. */ 1242 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1243 printf("Saving the key failed: %s.\n", identity_file); 1244 memset(passphrase1, 0, strlen(passphrase1)); 1245 xfree(passphrase1); 1246 key_free(private); 1247 xfree(comment); 1248 exit(1); 1249 } 1250 /* Destroy the passphrase and the copy of the key in memory. */ 1251 memset(passphrase1, 0, strlen(passphrase1)); 1252 xfree(passphrase1); 1253 key_free(private); /* Destroys contents */ 1254 xfree(comment); 1255 1256 printf("Your identification has been saved with the new passphrase.\n"); 1257 exit(0); 1258} 1259 1260/* 1261 * Print the SSHFP RR. 1262 */ 1263static int 1264do_print_resource_record(struct passwd *pw, char *fname, char *hname) 1265{ 1266 Key *public; 1267 char *comment = NULL; 1268 struct stat st; 1269 1270 if (fname == NULL) 1271 ask_filename(pw, "Enter file in which the key is"); 1272 if (stat(fname, &st) < 0) { 1273 if (errno == ENOENT) 1274 return 0; 1275 perror(fname); 1276 exit(1); 1277 } 1278 public = key_load_public(fname, &comment); 1279 if (public != NULL) { 1280 export_dns_rr(hname, public, stdout, print_generic); 1281 key_free(public); 1282 xfree(comment); 1283 return 1; 1284 } 1285 if (comment) 1286 xfree(comment); 1287 1288 printf("failed to read v2 public key from %s.\n", fname); 1289 exit(1); 1290} 1291 1292/* 1293 * Change the comment of a private key file. 1294 */ 1295static void 1296do_change_comment(struct passwd *pw) 1297{ 1298 char new_comment[1024], *comment, *passphrase; 1299 Key *private; 1300 Key *public; 1301 struct stat st; 1302 FILE *f; 1303 int fd; 1304 1305 if (!have_identity) 1306 ask_filename(pw, "Enter file in which the key is"); 1307 if (stat(identity_file, &st) < 0) { 1308 perror(identity_file); 1309 exit(1); 1310 } 1311 private = key_load_private(identity_file, "", &comment); 1312 if (private == NULL) { 1313 if (identity_passphrase) 1314 passphrase = xstrdup(identity_passphrase); 1315 else if (identity_new_passphrase) 1316 passphrase = xstrdup(identity_new_passphrase); 1317 else 1318 passphrase = read_passphrase("Enter passphrase: ", 1319 RP_ALLOW_STDIN); 1320 /* Try to load using the passphrase. */ 1321 private = key_load_private(identity_file, passphrase, &comment); 1322 if (private == NULL) { 1323 memset(passphrase, 0, strlen(passphrase)); 1324 xfree(passphrase); 1325 printf("Bad passphrase.\n"); 1326 exit(1); 1327 } 1328 } else { 1329 passphrase = xstrdup(""); 1330 } 1331 if (private->type != KEY_RSA1) { 1332 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 1333 key_free(private); 1334 exit(1); 1335 } 1336 printf("Key now has comment '%s'\n", comment); 1337 1338 if (identity_comment) { 1339 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1340 } else { 1341 printf("Enter new comment: "); 1342 fflush(stdout); 1343 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1344 memset(passphrase, 0, strlen(passphrase)); 1345 key_free(private); 1346 exit(1); 1347 } 1348 new_comment[strcspn(new_comment, "\n")] = '\0'; 1349 } 1350 1351 /* Save the file using the new passphrase. */ 1352 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 1353 printf("Saving the key failed: %s.\n", identity_file); 1354 memset(passphrase, 0, strlen(passphrase)); 1355 xfree(passphrase); 1356 key_free(private); 1357 xfree(comment); 1358 exit(1); 1359 } 1360 memset(passphrase, 0, strlen(passphrase)); 1361 xfree(passphrase); 1362 public = key_from_private(private); 1363 key_free(private); 1364 1365 strlcat(identity_file, ".pub", sizeof(identity_file)); 1366 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1367 if (fd == -1) { 1368 printf("Could not save your public key in %s\n", identity_file); 1369 exit(1); 1370 } 1371 f = fdopen(fd, "w"); 1372 if (f == NULL) { 1373 printf("fdopen %s failed\n", identity_file); 1374 exit(1); 1375 } 1376 if (!key_write(public, f)) 1377 fprintf(stderr, "write key failed\n"); 1378 key_free(public); 1379 fprintf(f, " %s\n", new_comment); 1380 fclose(f); 1381 1382 xfree(comment); 1383 1384 printf("The comment in your key file has been changed.\n"); 1385 exit(0); 1386} 1387 1388static const char * 1389fmt_validity(u_int64_t valid_from, u_int64_t valid_to) 1390{ 1391 char from[32], to[32]; 1392 static char ret[64]; 1393 time_t tt; 1394 struct tm *tm; 1395 1396 *from = *to = '\0'; 1397 if (valid_from == 0 && valid_to == 0xffffffffffffffffULL) 1398 return "forever"; 1399 1400 if (valid_from != 0) { 1401 /* XXX revisit INT_MAX in 2038 :) */ 1402 tt = valid_from > INT_MAX ? INT_MAX : valid_from; 1403 tm = localtime(&tt); 1404 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); 1405 } 1406 if (valid_to != 0xffffffffffffffffULL) { 1407 /* XXX revisit INT_MAX in 2038 :) */ 1408 tt = valid_to > INT_MAX ? INT_MAX : valid_to; 1409 tm = localtime(&tt); 1410 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); 1411 } 1412 1413 if (valid_from == 0) { 1414 snprintf(ret, sizeof(ret), "before %s", to); 1415 return ret; 1416 } 1417 if (valid_to == 0xffffffffffffffffULL) { 1418 snprintf(ret, sizeof(ret), "after %s", from); 1419 return ret; 1420 } 1421 1422 snprintf(ret, sizeof(ret), "from %s to %s", from, to); 1423 return ret; 1424} 1425 1426static void 1427add_flag_option(Buffer *c, const char *name) 1428{ 1429 debug3("%s: %s", __func__, name); 1430 buffer_put_cstring(c, name); 1431 buffer_put_string(c, NULL, 0); 1432} 1433 1434static void 1435add_string_option(Buffer *c, const char *name, const char *value) 1436{ 1437 Buffer b; 1438 1439 debug3("%s: %s=%s", __func__, name, value); 1440 buffer_init(&b); 1441 buffer_put_cstring(&b, value); 1442 1443 buffer_put_cstring(c, name); 1444 buffer_put_string(c, buffer_ptr(&b), buffer_len(&b)); 1445 1446 buffer_free(&b); 1447} 1448 1449#define OPTIONS_CRITICAL 1 1450#define OPTIONS_EXTENSIONS 2 1451static void 1452prepare_options_buf(Buffer *c, int which) 1453{ 1454 buffer_clear(c); 1455 if ((which & OPTIONS_CRITICAL) != 0 && 1456 certflags_command != NULL) 1457 add_string_option(c, "force-command", certflags_command); 1458 if ((which & OPTIONS_EXTENSIONS) != 0 && 1459 (certflags_flags & CERTOPT_X_FWD) != 0) 1460 add_flag_option(c, "permit-X11-forwarding"); 1461 if ((which & OPTIONS_EXTENSIONS) != 0 && 1462 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1463 add_flag_option(c, "permit-agent-forwarding"); 1464 if ((which & OPTIONS_EXTENSIONS) != 0 && 1465 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1466 add_flag_option(c, "permit-port-forwarding"); 1467 if ((which & OPTIONS_EXTENSIONS) != 0 && 1468 (certflags_flags & CERTOPT_PTY) != 0) 1469 add_flag_option(c, "permit-pty"); 1470 if ((which & OPTIONS_EXTENSIONS) != 0 && 1471 (certflags_flags & CERTOPT_USER_RC) != 0) 1472 add_flag_option(c, "permit-user-rc"); 1473 if ((which & OPTIONS_CRITICAL) != 0 && 1474 certflags_src_addr != NULL) 1475 add_string_option(c, "source-address", certflags_src_addr); 1476} 1477 1478static Key * 1479load_pkcs11_key(char *path) 1480{ 1481#ifdef ENABLE_PKCS11 1482 Key **keys = NULL, *public, *private = NULL; 1483 int i, nkeys; 1484 1485 if ((public = key_load_public(path, NULL)) == NULL) 1486 fatal("Couldn't load CA public key \"%s\"", path); 1487 1488 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1489 debug3("%s: %d keys", __func__, nkeys); 1490 if (nkeys <= 0) 1491 fatal("cannot read public key from pkcs11"); 1492 for (i = 0; i < nkeys; i++) { 1493 if (key_equal_public(public, keys[i])) { 1494 private = keys[i]; 1495 continue; 1496 } 1497 key_free(keys[i]); 1498 } 1499 xfree(keys); 1500 key_free(public); 1501 return private; 1502#else 1503 fatal("no pkcs11 support"); 1504#endif /* ENABLE_PKCS11 */ 1505} 1506 1507static void 1508do_ca_sign(struct passwd *pw, int argc, char **argv) 1509{ 1510 int i, fd; 1511 u_int n; 1512 Key *ca, *public; 1513 char *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1514 FILE *f; 1515 int v00 = 0; /* legacy keys */ 1516 1517 if (key_type_name != NULL) { 1518 switch (key_type_from_name(key_type_name)) { 1519 case KEY_RSA_CERT_V00: 1520 case KEY_DSA_CERT_V00: 1521 v00 = 1; 1522 break; 1523 case KEY_UNSPEC: 1524 if (strcasecmp(key_type_name, "v00") == 0) { 1525 v00 = 1; 1526 break; 1527 } else if (strcasecmp(key_type_name, "v01") == 0) 1528 break; 1529 /* FALLTHROUGH */ 1530 default: 1531 fprintf(stderr, "unknown key type %s\n", key_type_name); 1532 exit(1); 1533 } 1534 } 1535 1536 pkcs11_init(1); 1537 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1538 if (pkcs11provider != NULL) { 1539 if ((ca = load_pkcs11_key(tmp)) == NULL) 1540 fatal("No PKCS#11 key matching %s found", ca_key_path); 1541 } else if ((ca = load_identity(tmp)) == NULL) 1542 fatal("Couldn't load CA key \"%s\"", tmp); 1543 xfree(tmp); 1544 1545 for (i = 0; i < argc; i++) { 1546 /* Split list of principals */ 1547 n = 0; 1548 if (cert_principals != NULL) { 1549 otmp = tmp = xstrdup(cert_principals); 1550 plist = NULL; 1551 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1552 plist = xrealloc(plist, n + 1, sizeof(*plist)); 1553 if (*(plist[n] = xstrdup(cp)) == '\0') 1554 fatal("Empty principal name"); 1555 } 1556 xfree(otmp); 1557 } 1558 1559 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1560 if ((public = key_load_public(tmp, &comment)) == NULL) 1561 fatal("%s: unable to open \"%s\"", __func__, tmp); 1562 if (public->type != KEY_RSA && public->type != KEY_DSA && 1563 public->type != KEY_ECDSA) 1564 fatal("%s: key \"%s\" type %s cannot be certified", 1565 __func__, tmp, key_type(public)); 1566 1567 /* Prepare certificate to sign */ 1568 if (key_to_certified(public, v00) != 0) 1569 fatal("Could not upgrade key %s to certificate", tmp); 1570 public->cert->type = cert_key_type; 1571 public->cert->serial = (u_int64_t)cert_serial; 1572 public->cert->key_id = xstrdup(cert_key_id); 1573 public->cert->nprincipals = n; 1574 public->cert->principals = plist; 1575 public->cert->valid_after = cert_valid_from; 1576 public->cert->valid_before = cert_valid_to; 1577 if (v00) { 1578 prepare_options_buf(&public->cert->critical, 1579 OPTIONS_CRITICAL|OPTIONS_EXTENSIONS); 1580 } else { 1581 prepare_options_buf(&public->cert->critical, 1582 OPTIONS_CRITICAL); 1583 prepare_options_buf(&public->cert->extensions, 1584 OPTIONS_EXTENSIONS); 1585 } 1586 public->cert->signature_key = key_from_private(ca); 1587 1588 if (key_certify(public, ca) != 0) 1589 fatal("Couldn't not certify key %s", tmp); 1590 1591 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1592 *cp = '\0'; 1593 xasprintf(&out, "%s-cert.pub", tmp); 1594 xfree(tmp); 1595 1596 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1597 fatal("Could not open \"%s\" for writing: %s", out, 1598 strerror(errno)); 1599 if ((f = fdopen(fd, "w")) == NULL) 1600 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1601 if (!key_write(public, f)) 1602 fatal("Could not write certified key to %s", out); 1603 fprintf(f, " %s\n", comment); 1604 fclose(f); 1605 1606 if (!quiet) { 1607 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1608 "valid %s", key_cert_type(public), 1609 out, public->cert->key_id, 1610 (unsigned long long)public->cert->serial, 1611 cert_principals != NULL ? " for " : "", 1612 cert_principals != NULL ? cert_principals : "", 1613 fmt_validity(cert_valid_from, cert_valid_to)); 1614 } 1615 1616 key_free(public); 1617 xfree(out); 1618 } 1619 pkcs11_terminate(); 1620 exit(0); 1621} 1622 1623static u_int64_t 1624parse_relative_time(const char *s, time_t now) 1625{ 1626 int64_t mul, secs; 1627 1628 mul = *s == '-' ? -1 : 1; 1629 1630 if ((secs = convtime(s + 1)) == -1) 1631 fatal("Invalid relative certificate time %s", s); 1632 if (mul == -1 && secs > now) 1633 fatal("Certificate time %s cannot be represented", s); 1634 return now + (u_int64_t)(secs * mul); 1635} 1636 1637static u_int64_t 1638parse_absolute_time(const char *s) 1639{ 1640 struct tm tm; 1641 time_t tt; 1642 char buf[32], *fmt; 1643 1644 /* 1645 * POSIX strptime says "The application shall ensure that there 1646 * is white-space or other non-alphanumeric characters between 1647 * any two conversion specifications" so arrange things this way. 1648 */ 1649 switch (strlen(s)) { 1650 case 8: 1651 fmt = "%Y-%m-%d"; 1652 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1653 break; 1654 case 14: 1655 fmt = "%Y-%m-%dT%H:%M:%S"; 1656 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1657 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1658 break; 1659 default: 1660 fatal("Invalid certificate time format %s", s); 1661 } 1662 1663 bzero(&tm, sizeof(tm)); 1664 if (strptime(buf, fmt, &tm) == NULL) 1665 fatal("Invalid certificate time %s", s); 1666 if ((tt = mktime(&tm)) < 0) 1667 fatal("Certificate time %s cannot be represented", s); 1668 return (u_int64_t)tt; 1669} 1670 1671static void 1672parse_cert_times(char *timespec) 1673{ 1674 char *from, *to; 1675 time_t now = time(NULL); 1676 int64_t secs; 1677 1678 /* +timespec relative to now */ 1679 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1680 if ((secs = convtime(timespec + 1)) == -1) 1681 fatal("Invalid relative certificate life %s", timespec); 1682 cert_valid_to = now + secs; 1683 /* 1684 * Backdate certificate one minute to avoid problems on hosts 1685 * with poorly-synchronised clocks. 1686 */ 1687 cert_valid_from = ((now - 59)/ 60) * 60; 1688 return; 1689 } 1690 1691 /* 1692 * from:to, where 1693 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1694 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1695 */ 1696 from = xstrdup(timespec); 1697 to = strchr(from, ':'); 1698 if (to == NULL || from == to || *(to + 1) == '\0') 1699 fatal("Invalid certificate life specification %s", timespec); 1700 *to++ = '\0'; 1701 1702 if (*from == '-' || *from == '+') 1703 cert_valid_from = parse_relative_time(from, now); 1704 else 1705 cert_valid_from = parse_absolute_time(from); 1706 1707 if (*to == '-' || *to == '+') 1708 cert_valid_to = parse_relative_time(to, cert_valid_from); 1709 else 1710 cert_valid_to = parse_absolute_time(to); 1711 1712 if (cert_valid_to <= cert_valid_from) 1713 fatal("Empty certificate validity interval"); 1714 xfree(from); 1715} 1716 1717static void 1718add_cert_option(char *opt) 1719{ 1720 char *val; 1721 1722 if (strcasecmp(opt, "clear") == 0) 1723 certflags_flags = 0; 1724 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1725 certflags_flags &= ~CERTOPT_X_FWD; 1726 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1727 certflags_flags |= CERTOPT_X_FWD; 1728 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1729 certflags_flags &= ~CERTOPT_AGENT_FWD; 1730 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1731 certflags_flags |= CERTOPT_AGENT_FWD; 1732 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1733 certflags_flags &= ~CERTOPT_PORT_FWD; 1734 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1735 certflags_flags |= CERTOPT_PORT_FWD; 1736 else if (strcasecmp(opt, "no-pty") == 0) 1737 certflags_flags &= ~CERTOPT_PTY; 1738 else if (strcasecmp(opt, "permit-pty") == 0) 1739 certflags_flags |= CERTOPT_PTY; 1740 else if (strcasecmp(opt, "no-user-rc") == 0) 1741 certflags_flags &= ~CERTOPT_USER_RC; 1742 else if (strcasecmp(opt, "permit-user-rc") == 0) 1743 certflags_flags |= CERTOPT_USER_RC; 1744 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1745 val = opt + 14; 1746 if (*val == '\0') 1747 fatal("Empty force-command option"); 1748 if (certflags_command != NULL) 1749 fatal("force-command already specified"); 1750 certflags_command = xstrdup(val); 1751 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1752 val = opt + 15; 1753 if (*val == '\0') 1754 fatal("Empty source-address option"); 1755 if (certflags_src_addr != NULL) 1756 fatal("source-address already specified"); 1757 if (addr_match_cidr_list(NULL, val) != 0) 1758 fatal("Invalid source-address list"); 1759 certflags_src_addr = xstrdup(val); 1760 } else 1761 fatal("Unsupported certificate option \"%s\"", opt); 1762} 1763 1764static void 1765show_options(const Buffer *optbuf, int v00, int in_critical) 1766{ 1767 u_char *name, *data; 1768 u_int dlen; 1769 Buffer options, option; 1770 1771 buffer_init(&options); 1772 buffer_append(&options, buffer_ptr(optbuf), buffer_len(optbuf)); 1773 1774 buffer_init(&option); 1775 while (buffer_len(&options) != 0) { 1776 name = buffer_get_string(&options, NULL); 1777 data = buffer_get_string_ptr(&options, &dlen); 1778 buffer_append(&option, data, dlen); 1779 printf(" %s", name); 1780 if ((v00 || !in_critical) && 1781 (strcmp(name, "permit-X11-forwarding") == 0 || 1782 strcmp(name, "permit-agent-forwarding") == 0 || 1783 strcmp(name, "permit-port-forwarding") == 0 || 1784 strcmp(name, "permit-pty") == 0 || 1785 strcmp(name, "permit-user-rc") == 0)) 1786 printf("\n"); 1787 else if ((v00 || in_critical) && 1788 (strcmp(name, "force-command") == 0 || 1789 strcmp(name, "source-address") == 0)) { 1790 data = buffer_get_string(&option, NULL); 1791 printf(" %s\n", data); 1792 xfree(data); 1793 } else { 1794 printf(" UNKNOWN OPTION (len %u)\n", 1795 buffer_len(&option)); 1796 buffer_clear(&option); 1797 } 1798 xfree(name); 1799 if (buffer_len(&option) != 0) 1800 fatal("Option corrupt: extra data at end"); 1801 } 1802 buffer_free(&option); 1803 buffer_free(&options); 1804} 1805 1806static void 1807do_show_cert(struct passwd *pw) 1808{ 1809 Key *key; 1810 struct stat st; 1811 char *key_fp, *ca_fp; 1812 u_int i, v00; 1813 1814 if (!have_identity) 1815 ask_filename(pw, "Enter file in which the key is"); 1816 if (stat(identity_file, &st) < 0) 1817 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1818 if ((key = key_load_public(identity_file, NULL)) == NULL) 1819 fatal("%s is not a public key", identity_file); 1820 if (!key_is_cert(key)) 1821 fatal("%s is not a certificate", identity_file); 1822 v00 = key->type == KEY_RSA_CERT_V00 || key->type == KEY_DSA_CERT_V00; 1823 1824 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); 1825 ca_fp = key_fingerprint(key->cert->signature_key, 1826 SSH_FP_MD5, SSH_FP_HEX); 1827 1828 printf("%s:\n", identity_file); 1829 printf(" Type: %s %s certificate\n", key_ssh_name(key), 1830 key_cert_type(key)); 1831 printf(" Public key: %s %s\n", key_type(key), key_fp); 1832 printf(" Signing CA: %s %s\n", 1833 key_type(key->cert->signature_key), ca_fp); 1834 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1835 if (!v00) { 1836 printf(" Serial: %llu\n", 1837 (unsigned long long)key->cert->serial); 1838 } 1839 printf(" Valid: %s\n", 1840 fmt_validity(key->cert->valid_after, key->cert->valid_before)); 1841 printf(" Principals: "); 1842 if (key->cert->nprincipals == 0) 1843 printf("(none)\n"); 1844 else { 1845 for (i = 0; i < key->cert->nprincipals; i++) 1846 printf("\n %s", 1847 key->cert->principals[i]); 1848 printf("\n"); 1849 } 1850 printf(" Critical Options: "); 1851 if (buffer_len(&key->cert->critical) == 0) 1852 printf("(none)\n"); 1853 else { 1854 printf("\n"); 1855 show_options(&key->cert->critical, v00, 1); 1856 } 1857 if (!v00) { 1858 printf(" Extensions: "); 1859 if (buffer_len(&key->cert->extensions) == 0) 1860 printf("(none)\n"); 1861 else { 1862 printf("\n"); 1863 show_options(&key->cert->extensions, v00, 0); 1864 } 1865 } 1866 exit(0); 1867} 1868 1869static void 1870usage(void) 1871{ 1872 fprintf(stderr, "usage: %s [options]\n", __progname); 1873 fprintf(stderr, "Options:\n"); 1874 fprintf(stderr, " -A Generate non-existent host keys for all key types.\n"); 1875 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); 1876 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 1877 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 1878 fprintf(stderr, " -C comment Provide new comment.\n"); 1879 fprintf(stderr, " -c Change comment in private and public key files.\n"); 1880#ifdef ENABLE_PKCS11 1881 fprintf(stderr, " -D pkcs11 Download public key from pkcs11 token.\n"); 1882#endif 1883 fprintf(stderr, " -e Export OpenSSH to foreign format key file.\n"); 1884 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); 1885 fprintf(stderr, " -f filename Filename of the key file.\n"); 1886 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); 1887 fprintf(stderr, " -g Use generic DNS resource record format.\n"); 1888 fprintf(stderr, " -H Hash names in known_hosts file.\n"); 1889 fprintf(stderr, " -h Generate host certificate instead of a user certificate.\n"); 1890 fprintf(stderr, " -I key_id Key identifier to include in certificate.\n"); 1891 fprintf(stderr, " -i Import foreign format to OpenSSH key file.\n"); 1892 fprintf(stderr, " -J number Screen this number of moduli lines.\n"); 1893 fprintf(stderr, " -j number Start screening moduli at specified line.\n"); 1894 fprintf(stderr, " -K checkpt Write checkpoints to this file.\n"); 1895 fprintf(stderr, " -L Print the contents of a certificate.\n"); 1896 fprintf(stderr, " -l Show fingerprint of key file.\n"); 1897 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); 1898 fprintf(stderr, " -m key_fmt Conversion format for -e/-i (PEM|PKCS8|RFC4716).\n"); 1899 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 1900 fprintf(stderr, " -n name,... User/host principal names to include in certificate\n"); 1901 fprintf(stderr, " -O option Specify a certificate option.\n"); 1902 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 1903 fprintf(stderr, " -p Change passphrase of private key file.\n"); 1904 fprintf(stderr, " -q Quiet.\n"); 1905 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); 1906 fprintf(stderr, " -r hostname Print DNS resource record.\n"); 1907 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); 1908 fprintf(stderr, " -s ca_key Certify keys with CA key.\n"); 1909 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); 1910 fprintf(stderr, " -t type Specify type of key to create.\n"); 1911 fprintf(stderr, " -V from:to Specify certificate validity interval.\n"); 1912 fprintf(stderr, " -v Verbose.\n"); 1913 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); 1914 fprintf(stderr, " -y Read private key file and print public key.\n"); 1915 fprintf(stderr, " -z serial Specify a serial number.\n"); 1916 1917 exit(1); 1918} 1919 1920/* 1921 * Main program for key management. 1922 */ 1923int 1924main(int argc, char **argv) 1925{ 1926 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 1927 char *checkpoint = NULL; 1928 char out_file[MAXPATHLEN], *rr_hostname = NULL; 1929 Key *private, *public; 1930 struct passwd *pw; 1931 struct stat st; 1932 int opt, type, fd; 1933 u_int32_t memory = 0, generator_wanted = 0, trials = 100; 1934 int do_gen_candidates = 0, do_screen_candidates = 0; 1935 int gen_all_hostkeys = 0; 1936 unsigned long start_lineno = 0, lines_to_process = 0; 1937 BIGNUM *start = NULL; 1938 FILE *f; 1939 const char *errstr; 1940 1941 extern int optind; 1942 extern char *optarg; 1943 1944 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 1945 sanitise_stdfd(); 1946 1947 __progname = ssh_get_progname(argv[0]); 1948 1949 OpenSSL_add_all_algorithms(); 1950 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 1951 1952 seed_rng(); 1953 1954 /* we need this for the home * directory. */ 1955 pw = getpwuid(getuid()); 1956 if (!pw) { 1957 printf("You don't exist, go away!\n"); 1958 exit(1); 1959 } 1960 if (gethostname(hostname, sizeof(hostname)) < 0) { 1961 perror("gethostname"); 1962 exit(1); 1963 } 1964 1965 while ((opt = getopt(argc, argv, "AegiqpclBHLhvxXyF:b:f:t:D:I:J:j:K:P:" 1966 "m:N:n:O:C:r:g:R:T:G:M:S:s:a:V:W:z")) != -1) { 1967 switch (opt) { 1968 case 'A': 1969 gen_all_hostkeys = 1; 1970 break; 1971 case 'b': 1972 bits = (u_int32_t)strtonum(optarg, 256, 32768, &errstr); 1973 if (errstr) 1974 fatal("Bits has bad value %s (%s)", 1975 optarg, errstr); 1976 break; 1977 case 'F': 1978 find_host = 1; 1979 rr_hostname = optarg; 1980 break; 1981 case 'H': 1982 hash_hosts = 1; 1983 break; 1984 case 'I': 1985 cert_key_id = optarg; 1986 break; 1987 case 'J': 1988 lines_to_process = strtoul(optarg, NULL, 10); 1989 break; 1990 case 'j': 1991 start_lineno = strtoul(optarg, NULL, 10); 1992 break; 1993 case 'R': 1994 delete_host = 1; 1995 rr_hostname = optarg; 1996 break; 1997 case 'L': 1998 show_cert = 1; 1999 break; 2000 case 'l': 2001 print_fingerprint = 1; 2002 break; 2003 case 'B': 2004 print_bubblebabble = 1; 2005 break; 2006 case 'm': 2007 if (strcasecmp(optarg, "RFC4716") == 0 || 2008 strcasecmp(optarg, "ssh2") == 0) { 2009 convert_format = FMT_RFC4716; 2010 break; 2011 } 2012 if (strcasecmp(optarg, "PKCS8") == 0) { 2013 convert_format = FMT_PKCS8; 2014 break; 2015 } 2016 if (strcasecmp(optarg, "PEM") == 0) { 2017 convert_format = FMT_PEM; 2018 break; 2019 } 2020 fatal("Unsupported conversion format \"%s\"", optarg); 2021 case 'n': 2022 cert_principals = optarg; 2023 break; 2024 case 'p': 2025 change_passphrase = 1; 2026 break; 2027 case 'c': 2028 change_comment = 1; 2029 break; 2030 case 'f': 2031 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= 2032 sizeof(identity_file)) 2033 fatal("Identity filename too long"); 2034 have_identity = 1; 2035 break; 2036 case 'g': 2037 print_generic = 1; 2038 break; 2039 case 'P': 2040 identity_passphrase = optarg; 2041 break; 2042 case 'N': 2043 identity_new_passphrase = optarg; 2044 break; 2045 case 'O': 2046 add_cert_option(optarg); 2047 break; 2048 case 'C': 2049 identity_comment = optarg; 2050 break; 2051 case 'q': 2052 quiet = 1; 2053 break; 2054 case 'e': 2055 case 'x': 2056 /* export key */ 2057 convert_to = 1; 2058 break; 2059 case 'h': 2060 cert_key_type = SSH2_CERT_TYPE_HOST; 2061 certflags_flags = 0; 2062 break; 2063 case 'i': 2064 case 'X': 2065 /* import key */ 2066 convert_from = 1; 2067 break; 2068 case 'y': 2069 print_public = 1; 2070 break; 2071 case 's': 2072 ca_key_path = optarg; 2073 break; 2074 case 't': 2075 key_type_name = optarg; 2076 break; 2077 case 'D': 2078 pkcs11provider = optarg; 2079 break; 2080 case 'v': 2081 if (log_level == SYSLOG_LEVEL_INFO) 2082 log_level = SYSLOG_LEVEL_DEBUG1; 2083 else { 2084 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2085 log_level < SYSLOG_LEVEL_DEBUG3) 2086 log_level++; 2087 } 2088 break; 2089 case 'r': 2090 rr_hostname = optarg; 2091 break; 2092 case 'W': 2093 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2094 UINT_MAX, &errstr); 2095 if (errstr) 2096 fatal("Desired generator has bad value: %s (%s)", 2097 optarg, errstr); 2098 break; 2099 case 'a': 2100 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2101 if (errstr) 2102 fatal("Invalid number of trials: %s (%s)", 2103 optarg, errstr); 2104 break; 2105 case 'M': 2106 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2107 if (errstr) 2108 fatal("Memory limit is %s: %s", errstr, optarg); 2109 break; 2110 case 'G': 2111 do_gen_candidates = 1; 2112 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2113 sizeof(out_file)) 2114 fatal("Output filename too long"); 2115 break; 2116 case 'T': 2117 do_screen_candidates = 1; 2118 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2119 sizeof(out_file)) 2120 fatal("Output filename too long"); 2121 break; 2122 case 'K': 2123 if (strlen(optarg) >= MAXPATHLEN) 2124 fatal("Checkpoint filename too long"); 2125 checkpoint = xstrdup(optarg); 2126 break; 2127 case 'S': 2128 /* XXX - also compare length against bits */ 2129 if (BN_hex2bn(&start, optarg) == 0) 2130 fatal("Invalid start point."); 2131 break; 2132 case 'V': 2133 parse_cert_times(optarg); 2134 break; 2135 case 'z': 2136 cert_serial = strtonum(optarg, 0, LLONG_MAX, &errstr); 2137 if (errstr) 2138 fatal("Invalid serial number: %s", errstr); 2139 break; 2140 case '?': 2141 default: 2142 usage(); 2143 } 2144 } 2145 2146 /* reinit */ 2147 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2148 2149 argv += optind; 2150 argc -= optind; 2151 2152 if (ca_key_path != NULL) { 2153 if (argc < 1) { 2154 printf("Too few arguments.\n"); 2155 usage(); 2156 } 2157 } else if (argc > 0) { 2158 printf("Too many arguments.\n"); 2159 usage(); 2160 } 2161 if (change_passphrase && change_comment) { 2162 printf("Can only have one of -p and -c.\n"); 2163 usage(); 2164 } 2165 if (print_fingerprint && (delete_host || hash_hosts)) { 2166 printf("Cannot use -l with -D or -R.\n"); 2167 usage(); 2168 } 2169 if (ca_key_path != NULL) { 2170 if (cert_key_id == NULL) 2171 fatal("Must specify key id (-I) when certifying"); 2172 do_ca_sign(pw, argc, argv); 2173 } 2174 if (show_cert) 2175 do_show_cert(pw); 2176 if (delete_host || hash_hosts || find_host) 2177 do_known_hosts(pw, rr_hostname); 2178 if (print_fingerprint || print_bubblebabble) 2179 do_fingerprint(pw); 2180 if (change_passphrase) 2181 do_change_passphrase(pw); 2182 if (change_comment) 2183 do_change_comment(pw); 2184 if (convert_to) 2185 do_convert_to(pw); 2186 if (convert_from) 2187 do_convert_from(pw); 2188 if (print_public) 2189 do_print_public(pw); 2190 if (rr_hostname != NULL) { 2191 unsigned int n = 0; 2192 2193 if (have_identity) { 2194 n = do_print_resource_record(pw, 2195 identity_file, rr_hostname); 2196 if (n == 0) { 2197 perror(identity_file); 2198 exit(1); 2199 } 2200 exit(0); 2201 } else { 2202 2203 n += do_print_resource_record(pw, 2204 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2205 n += do_print_resource_record(pw, 2206 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2207 n += do_print_resource_record(pw, 2208 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname); 2209 2210 if (n == 0) 2211 fatal("no keys found."); 2212 exit(0); 2213 } 2214 } 2215 if (pkcs11provider != NULL) 2216 do_download(pw); 2217 2218 if (do_gen_candidates) { 2219 FILE *out = fopen(out_file, "w"); 2220 2221 if (out == NULL) { 2222 error("Couldn't open modulus candidate file \"%s\": %s", 2223 out_file, strerror(errno)); 2224 return (1); 2225 } 2226 if (bits == 0) 2227 bits = DEFAULT_BITS; 2228 if (gen_candidates(out, memory, bits, start) != 0) 2229 fatal("modulus candidate generation failed"); 2230 2231 return (0); 2232 } 2233 2234 if (do_screen_candidates) { 2235 FILE *in; 2236 FILE *out = fopen(out_file, "w"); 2237 2238 if (have_identity && strcmp(identity_file, "-") != 0) { 2239 if ((in = fopen(identity_file, "r")) == NULL) { 2240 fatal("Couldn't open modulus candidate " 2241 "file \"%s\": %s", identity_file, 2242 strerror(errno)); 2243 } 2244 } else 2245 in = stdin; 2246 2247 if (out == NULL) { 2248 fatal("Couldn't open moduli file \"%s\": %s", 2249 out_file, strerror(errno)); 2250 } 2251 if (prime_test(in, out, trials, generator_wanted, checkpoint, 2252 start_lineno, lines_to_process) != 0) 2253 fatal("modulus screening failed"); 2254 return (0); 2255 } 2256 2257 if (gen_all_hostkeys) { 2258 do_gen_all_hostkeys(pw); 2259 return (0); 2260 } 2261 2262 arc4random_stir(); 2263 2264 if (key_type_name == NULL) 2265 key_type_name = "rsa"; 2266 2267 type = key_type_from_name(key_type_name); 2268 type_bits_valid(type, &bits); 2269 2270 if (!quiet) 2271 printf("Generating public/private %s key pair.\n", key_type_name); 2272 private = key_generate(type, bits); 2273 if (private == NULL) { 2274 fprintf(stderr, "key_generate failed\n"); 2275 exit(1); 2276 } 2277 public = key_from_private(private); 2278 2279 if (!have_identity) 2280 ask_filename(pw, "Enter file in which to save the key"); 2281 2282 /* Create ~/.ssh directory if it doesn't already exist. */ 2283 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2284 pw->pw_dir, _PATH_SSH_USER_DIR); 2285 if (strstr(identity_file, dotsshdir) != NULL) { 2286 if (stat(dotsshdir, &st) < 0) { 2287 if (errno != ENOENT) { 2288 error("Could not stat %s: %s", dotsshdir, 2289 strerror(errno)); 2290 } else if (mkdir(dotsshdir, 0700) < 0) { 2291 error("Could not create directory '%s': %s", 2292 dotsshdir, strerror(errno)); 2293 } else if (!quiet) 2294 printf("Created directory '%s'.\n", dotsshdir); 2295 } 2296 } 2297 /* If the file already exists, ask the user to confirm. */ 2298 if (stat(identity_file, &st) >= 0) { 2299 char yesno[3]; 2300 printf("%s already exists.\n", identity_file); 2301 printf("Overwrite (y/n)? "); 2302 fflush(stdout); 2303 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2304 exit(1); 2305 if (yesno[0] != 'y' && yesno[0] != 'Y') 2306 exit(1); 2307 } 2308 /* Ask for a passphrase (twice). */ 2309 if (identity_passphrase) 2310 passphrase1 = xstrdup(identity_passphrase); 2311 else if (identity_new_passphrase) 2312 passphrase1 = xstrdup(identity_new_passphrase); 2313 else { 2314passphrase_again: 2315 passphrase1 = 2316 read_passphrase("Enter passphrase (empty for no " 2317 "passphrase): ", RP_ALLOW_STDIN); 2318 passphrase2 = read_passphrase("Enter same passphrase again: ", 2319 RP_ALLOW_STDIN); 2320 if (strcmp(passphrase1, passphrase2) != 0) { 2321 /* 2322 * The passphrases do not match. Clear them and 2323 * retry. 2324 */ 2325 memset(passphrase1, 0, strlen(passphrase1)); 2326 memset(passphrase2, 0, strlen(passphrase2)); 2327 xfree(passphrase1); 2328 xfree(passphrase2); 2329 printf("Passphrases do not match. Try again.\n"); 2330 goto passphrase_again; 2331 } 2332 /* Clear the other copy of the passphrase. */ 2333 memset(passphrase2, 0, strlen(passphrase2)); 2334 xfree(passphrase2); 2335 } 2336 2337 if (identity_comment) { 2338 strlcpy(comment, identity_comment, sizeof(comment)); 2339 } else { 2340 /* Create default comment field for the passphrase. */ 2341 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2342 } 2343 2344 /* Save the key with the given passphrase and comment. */ 2345 if (!key_save_private(private, identity_file, passphrase1, comment)) { 2346 printf("Saving the key failed: %s.\n", identity_file); 2347 memset(passphrase1, 0, strlen(passphrase1)); 2348 xfree(passphrase1); 2349 exit(1); 2350 } 2351 /* Clear the passphrase. */ 2352 memset(passphrase1, 0, strlen(passphrase1)); 2353 xfree(passphrase1); 2354 2355 /* Clear the private key and the random number generator. */ 2356 key_free(private); 2357 arc4random_stir(); 2358 2359 if (!quiet) 2360 printf("Your identification has been saved in %s.\n", identity_file); 2361 2362 strlcat(identity_file, ".pub", sizeof(identity_file)); 2363 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 2364 if (fd == -1) { 2365 printf("Could not save your public key in %s\n", identity_file); 2366 exit(1); 2367 } 2368 f = fdopen(fd, "w"); 2369 if (f == NULL) { 2370 printf("fdopen %s failed\n", identity_file); 2371 exit(1); 2372 } 2373 if (!key_write(public, f)) 2374 fprintf(stderr, "write key failed\n"); 2375 fprintf(f, " %s\n", comment); 2376 fclose(f); 2377 2378 if (!quiet) { 2379 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 2380 char *ra = key_fingerprint(public, SSH_FP_MD5, 2381 SSH_FP_RANDOMART); 2382 printf("Your public key has been saved in %s.\n", 2383 identity_file); 2384 printf("The key fingerprint is:\n"); 2385 printf("%s %s\n", fp, comment); 2386 printf("The key's randomart image is:\n"); 2387 printf("%s\n", ra); 2388 xfree(ra); 2389 xfree(fp); 2390 } 2391 2392 key_free(public); 2393 exit(0); 2394} 2395