ssh-keygen.c revision 225736
1/* $OpenBSD: ssh-keygen.c,v 1.205 2011/01/11 06:13:10 djm Exp $ */ 2/* 3 * Author: Tatu Ylonen <ylo@cs.hut.fi> 4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * Identity and host key generation and maintenance. 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 */ 14 15#include "includes.h" 16 17#include <sys/types.h> 18#include <sys/socket.h> 19#include <sys/stat.h> 20#include <sys/param.h> 21 22#include <openssl/evp.h> 23#include <openssl/pem.h> 24#include "openbsd-compat/openssl-compat.h" 25 26#include <errno.h> 27#include <fcntl.h> 28#include <netdb.h> 29#ifdef HAVE_PATHS_H 30# include <paths.h> 31#endif 32#include <pwd.h> 33#include <stdarg.h> 34#include <stdio.h> 35#include <stdlib.h> 36#include <string.h> 37#include <unistd.h> 38 39#include "xmalloc.h" 40#include "key.h" 41#include "rsa.h" 42#include "authfile.h" 43#include "uuencode.h" 44#include "buffer.h" 45#include "pathnames.h" 46#include "log.h" 47#include "misc.h" 48#include "match.h" 49#include "hostfile.h" 50#include "dns.h" 51#include "ssh2.h" 52 53#ifdef ENABLE_PKCS11 54#include "ssh-pkcs11.h" 55#endif 56 57/* Number of bits in the RSA/DSA key. This value can be set on the command line. */ 58#define DEFAULT_BITS 2048 59#define DEFAULT_BITS_DSA 1024 60#define DEFAULT_BITS_ECDSA 256 61u_int32_t bits = 0; 62 63/* 64 * Flag indicating that we just want to change the passphrase. This can be 65 * set on the command line. 66 */ 67int change_passphrase = 0; 68 69/* 70 * Flag indicating that we just want to change the comment. This can be set 71 * on the command line. 72 */ 73int change_comment = 0; 74 75int quiet = 0; 76 77int log_level = SYSLOG_LEVEL_INFO; 78 79/* Flag indicating that we want to hash a known_hosts file */ 80int hash_hosts = 0; 81/* Flag indicating that we want lookup a host in known_hosts file */ 82int find_host = 0; 83/* Flag indicating that we want to delete a host from a known_hosts file */ 84int delete_host = 0; 85 86/* Flag indicating that we want to show the contents of a certificate */ 87int show_cert = 0; 88 89/* Flag indicating that we just want to see the key fingerprint */ 90int print_fingerprint = 0; 91int print_bubblebabble = 0; 92 93/* The identity file name, given on the command line or entered by the user. */ 94char identity_file[1024]; 95int have_identity = 0; 96 97/* This is set to the passphrase if given on the command line. */ 98char *identity_passphrase = NULL; 99 100/* This is set to the new passphrase if given on the command line. */ 101char *identity_new_passphrase = NULL; 102 103/* This is set to the new comment if given on the command line. */ 104char *identity_comment = NULL; 105 106/* Path to CA key when certifying keys. */ 107char *ca_key_path = NULL; 108 109/* Certificate serial number */ 110long long cert_serial = 0; 111 112/* Key type when certifying */ 113u_int cert_key_type = SSH2_CERT_TYPE_USER; 114 115/* "key ID" of signed key */ 116char *cert_key_id = NULL; 117 118/* Comma-separated list of principal names for certifying keys */ 119char *cert_principals = NULL; 120 121/* Validity period for certificates */ 122u_int64_t cert_valid_from = 0; 123u_int64_t cert_valid_to = ~0ULL; 124 125/* Certificate options */ 126#define CERTOPT_X_FWD (1) 127#define CERTOPT_AGENT_FWD (1<<1) 128#define CERTOPT_PORT_FWD (1<<2) 129#define CERTOPT_PTY (1<<3) 130#define CERTOPT_USER_RC (1<<4) 131#define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 132 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 133u_int32_t certflags_flags = CERTOPT_DEFAULT; 134char *certflags_command = NULL; 135char *certflags_src_addr = NULL; 136 137/* Conversion to/from various formats */ 138int convert_to = 0; 139int convert_from = 0; 140enum { 141 FMT_RFC4716, 142 FMT_PKCS8, 143 FMT_PEM 144} convert_format = FMT_RFC4716; 145int print_public = 0; 146int print_generic = 0; 147 148char *key_type_name = NULL; 149 150/* Load key from this PKCS#11 provider */ 151char *pkcs11provider = NULL; 152 153/* argv0 */ 154extern char *__progname; 155 156char hostname[MAXHOSTNAMELEN]; 157 158/* moduli.c */ 159int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 160int prime_test(FILE *, FILE *, u_int32_t, u_int32_t); 161 162static void 163ask_filename(struct passwd *pw, const char *prompt) 164{ 165 char buf[1024]; 166 char *name = NULL; 167 168 if (key_type_name == NULL) 169 name = _PATH_SSH_CLIENT_ID_RSA; 170 else { 171 switch (key_type_from_name(key_type_name)) { 172 case KEY_RSA1: 173 name = _PATH_SSH_CLIENT_IDENTITY; 174 break; 175 case KEY_DSA_CERT: 176 case KEY_DSA_CERT_V00: 177 case KEY_DSA: 178 name = _PATH_SSH_CLIENT_ID_DSA; 179 break; 180#ifdef OPENSSL_HAS_ECC 181 case KEY_ECDSA_CERT: 182 case KEY_ECDSA: 183 name = _PATH_SSH_CLIENT_ID_ECDSA; 184 break; 185#endif 186 case KEY_RSA_CERT: 187 case KEY_RSA_CERT_V00: 188 case KEY_RSA: 189 name = _PATH_SSH_CLIENT_ID_RSA; 190 break; 191 default: 192 fprintf(stderr, "bad key type\n"); 193 exit(1); 194 break; 195 } 196 } 197 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 198 fprintf(stderr, "%s (%s): ", prompt, identity_file); 199 if (fgets(buf, sizeof(buf), stdin) == NULL) 200 exit(1); 201 buf[strcspn(buf, "\n")] = '\0'; 202 if (strcmp(buf, "") != 0) 203 strlcpy(identity_file, buf, sizeof(identity_file)); 204 have_identity = 1; 205} 206 207static Key * 208load_identity(char *filename) 209{ 210 char *pass; 211 Key *prv; 212 213 prv = key_load_private(filename, "", NULL); 214 if (prv == NULL) { 215 if (identity_passphrase) 216 pass = xstrdup(identity_passphrase); 217 else 218 pass = read_passphrase("Enter passphrase: ", 219 RP_ALLOW_STDIN); 220 prv = key_load_private(filename, pass, NULL); 221 memset(pass, 0, strlen(pass)); 222 xfree(pass); 223 } 224 return prv; 225} 226 227#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 228#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 229#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 230#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 231 232static void 233do_convert_to_ssh2(struct passwd *pw, Key *k) 234{ 235 u_int len; 236 u_char *blob; 237 char comment[61]; 238 239 if (key_to_blob(k, &blob, &len) <= 0) { 240 fprintf(stderr, "key_to_blob failed\n"); 241 exit(1); 242 } 243 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 244 snprintf(comment, sizeof(comment), 245 "%u-bit %s, converted by %s@%s from OpenSSH", 246 key_size(k), key_type(k), 247 pw->pw_name, hostname); 248 249 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 250 fprintf(stdout, "Comment: \"%s\"\n", comment); 251 dump_base64(stdout, blob, len); 252 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 253 key_free(k); 254 xfree(blob); 255 exit(0); 256} 257 258static void 259do_convert_to_pkcs8(Key *k) 260{ 261 switch (key_type_plain(k->type)) { 262 case KEY_RSA: 263 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 264 fatal("PEM_write_RSA_PUBKEY failed"); 265 break; 266 case KEY_DSA: 267 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 268 fatal("PEM_write_DSA_PUBKEY failed"); 269 break; 270#ifdef OPENSSL_HAS_ECC 271 case KEY_ECDSA: 272 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 273 fatal("PEM_write_EC_PUBKEY failed"); 274 break; 275#endif 276 default: 277 fatal("%s: unsupported key type %s", __func__, key_type(k)); 278 } 279 exit(0); 280} 281 282static void 283do_convert_to_pem(Key *k) 284{ 285 switch (key_type_plain(k->type)) { 286 case KEY_RSA: 287 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 288 fatal("PEM_write_RSAPublicKey failed"); 289 break; 290#if notyet /* OpenSSH 0.9.8 lacks this function */ 291 case KEY_DSA: 292 if (!PEM_write_DSAPublicKey(stdout, k->dsa)) 293 fatal("PEM_write_DSAPublicKey failed"); 294 break; 295#endif 296 /* XXX ECDSA? */ 297 default: 298 fatal("%s: unsupported key type %s", __func__, key_type(k)); 299 } 300 exit(0); 301} 302 303static void 304do_convert_to(struct passwd *pw) 305{ 306 Key *k; 307 struct stat st; 308 309 if (!have_identity) 310 ask_filename(pw, "Enter file in which the key is"); 311 if (stat(identity_file, &st) < 0) 312 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 313 if ((k = key_load_public(identity_file, NULL)) == NULL) { 314 if ((k = load_identity(identity_file)) == NULL) { 315 fprintf(stderr, "load failed\n"); 316 exit(1); 317 } 318 } 319 if (k->type == KEY_RSA1) { 320 fprintf(stderr, "version 1 keys are not supported\n"); 321 exit(1); 322 } 323 324 switch (convert_format) { 325 case FMT_RFC4716: 326 do_convert_to_ssh2(pw, k); 327 break; 328 case FMT_PKCS8: 329 do_convert_to_pkcs8(k); 330 break; 331 case FMT_PEM: 332 do_convert_to_pem(k); 333 break; 334 default: 335 fatal("%s: unknown key format %d", __func__, convert_format); 336 } 337 exit(0); 338} 339 340static void 341buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 342{ 343 u_int bignum_bits = buffer_get_int(b); 344 u_int bytes = (bignum_bits + 7) / 8; 345 346 if (buffer_len(b) < bytes) 347 fatal("buffer_get_bignum_bits: input buffer too small: " 348 "need %d have %d", bytes, buffer_len(b)); 349 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL) 350 fatal("buffer_get_bignum_bits: BN_bin2bn failed"); 351 buffer_consume(b, bytes); 352} 353 354static Key * 355do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 356{ 357 Buffer b; 358 Key *key = NULL; 359 char *type, *cipher; 360 u_char *sig, data[] = "abcde12345"; 361 int magic, rlen, ktype, i1, i2, i3, i4; 362 u_int slen; 363 u_long e; 364 365 buffer_init(&b); 366 buffer_append(&b, blob, blen); 367 368 magic = buffer_get_int(&b); 369 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 370 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 371 buffer_free(&b); 372 return NULL; 373 } 374 i1 = buffer_get_int(&b); 375 type = buffer_get_string(&b, NULL); 376 cipher = buffer_get_string(&b, NULL); 377 i2 = buffer_get_int(&b); 378 i3 = buffer_get_int(&b); 379 i4 = buffer_get_int(&b); 380 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 381 if (strcmp(cipher, "none") != 0) { 382 error("unsupported cipher %s", cipher); 383 xfree(cipher); 384 buffer_free(&b); 385 xfree(type); 386 return NULL; 387 } 388 xfree(cipher); 389 390 if (strstr(type, "dsa")) { 391 ktype = KEY_DSA; 392 } else if (strstr(type, "rsa")) { 393 ktype = KEY_RSA; 394 } else { 395 buffer_free(&b); 396 xfree(type); 397 return NULL; 398 } 399 key = key_new_private(ktype); 400 xfree(type); 401 402 switch (key->type) { 403 case KEY_DSA: 404 buffer_get_bignum_bits(&b, key->dsa->p); 405 buffer_get_bignum_bits(&b, key->dsa->g); 406 buffer_get_bignum_bits(&b, key->dsa->q); 407 buffer_get_bignum_bits(&b, key->dsa->pub_key); 408 buffer_get_bignum_bits(&b, key->dsa->priv_key); 409 break; 410 case KEY_RSA: 411 e = buffer_get_char(&b); 412 debug("e %lx", e); 413 if (e < 30) { 414 e <<= 8; 415 e += buffer_get_char(&b); 416 debug("e %lx", e); 417 e <<= 8; 418 e += buffer_get_char(&b); 419 debug("e %lx", e); 420 } 421 if (!BN_set_word(key->rsa->e, e)) { 422 buffer_free(&b); 423 key_free(key); 424 return NULL; 425 } 426 buffer_get_bignum_bits(&b, key->rsa->d); 427 buffer_get_bignum_bits(&b, key->rsa->n); 428 buffer_get_bignum_bits(&b, key->rsa->iqmp); 429 buffer_get_bignum_bits(&b, key->rsa->q); 430 buffer_get_bignum_bits(&b, key->rsa->p); 431 rsa_generate_additional_parameters(key->rsa); 432 break; 433 } 434 rlen = buffer_len(&b); 435 if (rlen != 0) 436 error("do_convert_private_ssh2_from_blob: " 437 "remaining bytes in key blob %d", rlen); 438 buffer_free(&b); 439 440 /* try the key */ 441 key_sign(key, &sig, &slen, data, sizeof(data)); 442 key_verify(key, sig, slen, data, sizeof(data)); 443 xfree(sig); 444 return key; 445} 446 447static int 448get_line(FILE *fp, char *line, size_t len) 449{ 450 int c; 451 size_t pos = 0; 452 453 line[0] = '\0'; 454 while ((c = fgetc(fp)) != EOF) { 455 if (pos >= len - 1) { 456 fprintf(stderr, "input line too long.\n"); 457 exit(1); 458 } 459 switch (c) { 460 case '\r': 461 c = fgetc(fp); 462 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { 463 fprintf(stderr, "unget: %s\n", strerror(errno)); 464 exit(1); 465 } 466 return pos; 467 case '\n': 468 return pos; 469 } 470 line[pos++] = c; 471 line[pos] = '\0'; 472 } 473 /* We reached EOF */ 474 return -1; 475} 476 477static void 478do_convert_from_ssh2(struct passwd *pw, Key **k, int *private) 479{ 480 int blen; 481 u_int len; 482 char line[1024]; 483 u_char blob[8096]; 484 char encoded[8096]; 485 int escaped = 0; 486 FILE *fp; 487 488 if ((fp = fopen(identity_file, "r")) == NULL) 489 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 490 encoded[0] = '\0'; 491 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 492 if (line[blen - 1] == '\\') 493 escaped++; 494 if (strncmp(line, "----", 4) == 0 || 495 strstr(line, ": ") != NULL) { 496 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 497 *private = 1; 498 if (strstr(line, " END ") != NULL) { 499 break; 500 } 501 /* fprintf(stderr, "ignore: %s", line); */ 502 continue; 503 } 504 if (escaped) { 505 escaped--; 506 /* fprintf(stderr, "escaped: %s", line); */ 507 continue; 508 } 509 strlcat(encoded, line, sizeof(encoded)); 510 } 511 len = strlen(encoded); 512 if (((len % 4) == 3) && 513 (encoded[len-1] == '=') && 514 (encoded[len-2] == '=') && 515 (encoded[len-3] == '=')) 516 encoded[len-3] = '\0'; 517 blen = uudecode(encoded, blob, sizeof(blob)); 518 if (blen < 0) { 519 fprintf(stderr, "uudecode failed.\n"); 520 exit(1); 521 } 522 *k = *private ? 523 do_convert_private_ssh2_from_blob(blob, blen) : 524 key_from_blob(blob, blen); 525 if (*k == NULL) { 526 fprintf(stderr, "decode blob failed.\n"); 527 exit(1); 528 } 529 fclose(fp); 530} 531 532static void 533do_convert_from_pkcs8(Key **k, int *private) 534{ 535 EVP_PKEY *pubkey; 536 FILE *fp; 537 538 if ((fp = fopen(identity_file, "r")) == NULL) 539 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 540 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 541 fatal("%s: %s is not a recognised public key format", __func__, 542 identity_file); 543 } 544 fclose(fp); 545 switch (EVP_PKEY_type(pubkey->type)) { 546 case EVP_PKEY_RSA: 547 *k = key_new(KEY_UNSPEC); 548 (*k)->type = KEY_RSA; 549 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 550 break; 551 case EVP_PKEY_DSA: 552 *k = key_new(KEY_UNSPEC); 553 (*k)->type = KEY_DSA; 554 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 555 break; 556#ifdef OPENSSL_HAS_ECC 557 case EVP_PKEY_EC: 558 *k = key_new(KEY_UNSPEC); 559 (*k)->type = KEY_ECDSA; 560 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 561 (*k)->ecdsa_nid = key_ecdsa_key_to_nid((*k)->ecdsa); 562 break; 563#endif 564 default: 565 fatal("%s: unsupported pubkey type %d", __func__, 566 EVP_PKEY_type(pubkey->type)); 567 } 568 EVP_PKEY_free(pubkey); 569 return; 570} 571 572static void 573do_convert_from_pem(Key **k, int *private) 574{ 575 FILE *fp; 576 RSA *rsa; 577#ifdef notyet 578 DSA *dsa; 579#endif 580 581 if ((fp = fopen(identity_file, "r")) == NULL) 582 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 583 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 584 *k = key_new(KEY_UNSPEC); 585 (*k)->type = KEY_RSA; 586 (*k)->rsa = rsa; 587 fclose(fp); 588 return; 589 } 590#if notyet /* OpenSSH 0.9.8 lacks this function */ 591 rewind(fp); 592 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 593 *k = key_new(KEY_UNSPEC); 594 (*k)->type = KEY_DSA; 595 (*k)->dsa = dsa; 596 fclose(fp); 597 return; 598 } 599 /* XXX ECDSA */ 600#endif 601 fatal("%s: unrecognised raw private key format", __func__); 602} 603 604static void 605do_convert_from(struct passwd *pw) 606{ 607 Key *k = NULL; 608 int private = 0, ok = 0; 609 struct stat st; 610 611 if (!have_identity) 612 ask_filename(pw, "Enter file in which the key is"); 613 if (stat(identity_file, &st) < 0) 614 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 615 616 switch (convert_format) { 617 case FMT_RFC4716: 618 do_convert_from_ssh2(pw, &k, &private); 619 break; 620 case FMT_PKCS8: 621 do_convert_from_pkcs8(&k, &private); 622 break; 623 case FMT_PEM: 624 do_convert_from_pem(&k, &private); 625 break; 626 default: 627 fatal("%s: unknown key format %d", __func__, convert_format); 628 } 629 630 if (!private) 631 ok = key_write(k, stdout); 632 if (ok) 633 fprintf(stdout, "\n"); 634 else { 635 switch (k->type) { 636 case KEY_DSA: 637 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 638 NULL, 0, NULL, NULL); 639 break; 640#ifdef OPENSSL_HAS_ECC 641 case KEY_ECDSA: 642 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 643 NULL, 0, NULL, NULL); 644 break; 645#endif 646 case KEY_RSA: 647 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 648 NULL, 0, NULL, NULL); 649 break; 650 default: 651 fatal("%s: unsupported key type %s", __func__, 652 key_type(k)); 653 } 654 } 655 656 if (!ok) { 657 fprintf(stderr, "key write failed\n"); 658 exit(1); 659 } 660 key_free(k); 661 exit(0); 662} 663 664static void 665do_print_public(struct passwd *pw) 666{ 667 Key *prv; 668 struct stat st; 669 670 if (!have_identity) 671 ask_filename(pw, "Enter file in which the key is"); 672 if (stat(identity_file, &st) < 0) { 673 perror(identity_file); 674 exit(1); 675 } 676 prv = load_identity(identity_file); 677 if (prv == NULL) { 678 fprintf(stderr, "load failed\n"); 679 exit(1); 680 } 681 if (!key_write(prv, stdout)) 682 fprintf(stderr, "key_write failed"); 683 key_free(prv); 684 fprintf(stdout, "\n"); 685 exit(0); 686} 687 688static void 689do_download(struct passwd *pw) 690{ 691#ifdef ENABLE_PKCS11 692 Key **keys = NULL; 693 int i, nkeys; 694 695 pkcs11_init(0); 696 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 697 if (nkeys <= 0) 698 fatal("cannot read public key from pkcs11"); 699 for (i = 0; i < nkeys; i++) { 700 key_write(keys[i], stdout); 701 key_free(keys[i]); 702 fprintf(stdout, "\n"); 703 } 704 xfree(keys); 705 pkcs11_terminate(); 706 exit(0); 707#else 708 fatal("no pkcs11 support"); 709#endif /* ENABLE_PKCS11 */ 710} 711 712static void 713do_fingerprint(struct passwd *pw) 714{ 715 FILE *f; 716 Key *public; 717 char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra; 718 int i, skip = 0, num = 0, invalid = 1; 719 enum fp_rep rep; 720 enum fp_type fptype; 721 struct stat st; 722 723 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 724 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 725 726 if (!have_identity) 727 ask_filename(pw, "Enter file in which the key is"); 728 if (stat(identity_file, &st) < 0) { 729 perror(identity_file); 730 exit(1); 731 } 732 public = key_load_public(identity_file, &comment); 733 if (public != NULL) { 734 fp = key_fingerprint(public, fptype, rep); 735 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 736 printf("%u %s %s (%s)\n", key_size(public), fp, comment, 737 key_type(public)); 738 if (log_level >= SYSLOG_LEVEL_VERBOSE) 739 printf("%s\n", ra); 740 key_free(public); 741 xfree(comment); 742 xfree(ra); 743 xfree(fp); 744 exit(0); 745 } 746 if (comment) { 747 xfree(comment); 748 comment = NULL; 749 } 750 751 if ((f = fopen(identity_file, "r")) == NULL) 752 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 753 754 while (fgets(line, sizeof(line), f)) { 755 if ((cp = strchr(line, '\n')) == NULL) { 756 error("line %d too long: %.40s...", 757 num + 1, line); 758 skip = 1; 759 continue; 760 } 761 num++; 762 if (skip) { 763 skip = 0; 764 continue; 765 } 766 *cp = '\0'; 767 768 /* Skip leading whitespace, empty and comment lines. */ 769 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 770 ; 771 if (!*cp || *cp == '\n' || *cp == '#') 772 continue; 773 i = strtol(cp, &ep, 10); 774 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 775 int quoted = 0; 776 comment = cp; 777 for (; *cp && (quoted || (*cp != ' ' && 778 *cp != '\t')); cp++) { 779 if (*cp == '\\' && cp[1] == '"') 780 cp++; /* Skip both */ 781 else if (*cp == '"') 782 quoted = !quoted; 783 } 784 if (!*cp) 785 continue; 786 *cp++ = '\0'; 787 } 788 ep = cp; 789 public = key_new(KEY_RSA1); 790 if (key_read(public, &cp) != 1) { 791 cp = ep; 792 key_free(public); 793 public = key_new(KEY_UNSPEC); 794 if (key_read(public, &cp) != 1) { 795 key_free(public); 796 continue; 797 } 798 } 799 comment = *cp ? cp : comment; 800 fp = key_fingerprint(public, fptype, rep); 801 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 802 printf("%u %s %s (%s)\n", key_size(public), fp, 803 comment ? comment : "no comment", key_type(public)); 804 if (log_level >= SYSLOG_LEVEL_VERBOSE) 805 printf("%s\n", ra); 806 xfree(ra); 807 xfree(fp); 808 key_free(public); 809 invalid = 0; 810 } 811 fclose(f); 812 813 if (invalid) { 814 printf("%s is not a public key file.\n", identity_file); 815 exit(1); 816 } 817 exit(0); 818} 819 820static void 821printhost(FILE *f, const char *name, Key *public, int ca, int hash) 822{ 823 if (print_fingerprint) { 824 enum fp_rep rep; 825 enum fp_type fptype; 826 char *fp, *ra; 827 828 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 829 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 830 fp = key_fingerprint(public, fptype, rep); 831 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 832 printf("%u %s %s (%s)\n", key_size(public), fp, name, 833 key_type(public)); 834 if (log_level >= SYSLOG_LEVEL_VERBOSE) 835 printf("%s\n", ra); 836 xfree(ra); 837 xfree(fp); 838 } else { 839 if (hash && (name = host_hash(name, NULL, 0)) == NULL) 840 fatal("hash_host failed"); 841 fprintf(f, "%s%s%s ", ca ? CA_MARKER : "", ca ? " " : "", name); 842 if (!key_write(public, f)) 843 fatal("key_write failed"); 844 fprintf(f, "\n"); 845 } 846} 847 848static void 849do_known_hosts(struct passwd *pw, const char *name) 850{ 851 FILE *in, *out = stdout; 852 Key *pub; 853 char *cp, *cp2, *kp, *kp2; 854 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; 855 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; 856 int ca; 857 858 if (!have_identity) { 859 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 860 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 861 sizeof(identity_file)) 862 fatal("Specified known hosts path too long"); 863 xfree(cp); 864 have_identity = 1; 865 } 866 if ((in = fopen(identity_file, "r")) == NULL) 867 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 868 869 /* 870 * Find hosts goes to stdout, hash and deletions happen in-place 871 * A corner case is ssh-keygen -HF foo, which should go to stdout 872 */ 873 if (!find_host && (hash_hosts || delete_host)) { 874 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 875 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 876 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 877 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 878 fatal("known_hosts path too long"); 879 umask(077); 880 if ((c = mkstemp(tmp)) == -1) 881 fatal("mkstemp: %s", strerror(errno)); 882 if ((out = fdopen(c, "w")) == NULL) { 883 c = errno; 884 unlink(tmp); 885 fatal("fdopen: %s", strerror(c)); 886 } 887 inplace = 1; 888 } 889 890 while (fgets(line, sizeof(line), in)) { 891 if ((cp = strchr(line, '\n')) == NULL) { 892 error("line %d too long: %.40s...", num + 1, line); 893 skip = 1; 894 invalid = 1; 895 continue; 896 } 897 num++; 898 if (skip) { 899 skip = 0; 900 continue; 901 } 902 *cp = '\0'; 903 904 /* Skip leading whitespace, empty and comment lines. */ 905 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 906 ; 907 if (!*cp || *cp == '\n' || *cp == '#') { 908 if (inplace) 909 fprintf(out, "%s\n", cp); 910 continue; 911 } 912 /* Check whether this is a CA key */ 913 if (strncasecmp(cp, CA_MARKER, sizeof(CA_MARKER) - 1) == 0 && 914 (cp[sizeof(CA_MARKER) - 1] == ' ' || 915 cp[sizeof(CA_MARKER) - 1] == '\t')) { 916 ca = 1; 917 cp += sizeof(CA_MARKER); 918 } else 919 ca = 0; 920 921 /* Find the end of the host name portion. */ 922 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) 923 ; 924 925 if (*kp == '\0' || *(kp + 1) == '\0') { 926 error("line %d missing key: %.40s...", 927 num, line); 928 invalid = 1; 929 continue; 930 } 931 *kp++ = '\0'; 932 kp2 = kp; 933 934 pub = key_new(KEY_RSA1); 935 if (key_read(pub, &kp) != 1) { 936 kp = kp2; 937 key_free(pub); 938 pub = key_new(KEY_UNSPEC); 939 if (key_read(pub, &kp) != 1) { 940 error("line %d invalid key: %.40s...", 941 num, line); 942 key_free(pub); 943 invalid = 1; 944 continue; 945 } 946 } 947 948 if (*cp == HASH_DELIM) { 949 if (find_host || delete_host) { 950 cp2 = host_hash(name, cp, strlen(cp)); 951 if (cp2 == NULL) { 952 error("line %d: invalid hashed " 953 "name: %.64s...", num, line); 954 invalid = 1; 955 continue; 956 } 957 c = (strcmp(cp2, cp) == 0); 958 if (find_host && c) { 959 printf("# Host %s found: " 960 "line %d type %s%s\n", name, 961 num, key_type(pub), 962 ca ? " (CA key)" : ""); 963 printhost(out, cp, pub, ca, 0); 964 } 965 if (delete_host && !c && !ca) 966 printhost(out, cp, pub, ca, 0); 967 } else if (hash_hosts) 968 printhost(out, cp, pub, ca, 0); 969 } else { 970 if (find_host || delete_host) { 971 c = (match_hostname(name, cp, 972 strlen(cp)) == 1); 973 if (find_host && c) { 974 printf("# Host %s found: " 975 "line %d type %s%s\n", name, 976 num, key_type(pub), 977 ca ? " (CA key)" : ""); 978 printhost(out, name, pub, 979 ca, hash_hosts && !ca); 980 } 981 if (delete_host && !c && !ca) 982 printhost(out, cp, pub, ca, 0); 983 } else if (hash_hosts) { 984 for (cp2 = strsep(&cp, ","); 985 cp2 != NULL && *cp2 != '\0'; 986 cp2 = strsep(&cp, ",")) { 987 if (ca) { 988 fprintf(stderr, "Warning: " 989 "ignoring CA key for host: " 990 "%.64s\n", cp2); 991 printhost(out, cp2, pub, ca, 0); 992 } else if (strcspn(cp2, "*?!") != 993 strlen(cp2)) { 994 fprintf(stderr, "Warning: " 995 "ignoring host name with " 996 "metacharacters: %.64s\n", 997 cp2); 998 printhost(out, cp2, pub, ca, 0); 999 } else 1000 printhost(out, cp2, pub, ca, 1); 1001 } 1002 has_unhashed = 1; 1003 } 1004 } 1005 key_free(pub); 1006 } 1007 fclose(in); 1008 1009 if (invalid) { 1010 fprintf(stderr, "%s is not a valid known_hosts file.\n", 1011 identity_file); 1012 if (inplace) { 1013 fprintf(stderr, "Not replacing existing known_hosts " 1014 "file because of errors\n"); 1015 fclose(out); 1016 unlink(tmp); 1017 } 1018 exit(1); 1019 } 1020 1021 if (inplace) { 1022 fclose(out); 1023 1024 /* Backup existing file */ 1025 if (unlink(old) == -1 && errno != ENOENT) 1026 fatal("unlink %.100s: %s", old, strerror(errno)); 1027 if (link(identity_file, old) == -1) 1028 fatal("link %.100s to %.100s: %s", identity_file, old, 1029 strerror(errno)); 1030 /* Move new one into place */ 1031 if (rename(tmp, identity_file) == -1) { 1032 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1033 strerror(errno)); 1034 unlink(tmp); 1035 unlink(old); 1036 exit(1); 1037 } 1038 1039 fprintf(stderr, "%s updated.\n", identity_file); 1040 fprintf(stderr, "Original contents retained as %s\n", old); 1041 if (has_unhashed) { 1042 fprintf(stderr, "WARNING: %s contains unhashed " 1043 "entries\n", old); 1044 fprintf(stderr, "Delete this file to ensure privacy " 1045 "of hostnames\n"); 1046 } 1047 } 1048 1049 exit(0); 1050} 1051 1052/* 1053 * Perform changing a passphrase. The argument is the passwd structure 1054 * for the current user. 1055 */ 1056static void 1057do_change_passphrase(struct passwd *pw) 1058{ 1059 char *comment; 1060 char *old_passphrase, *passphrase1, *passphrase2; 1061 struct stat st; 1062 Key *private; 1063 1064 if (!have_identity) 1065 ask_filename(pw, "Enter file in which the key is"); 1066 if (stat(identity_file, &st) < 0) { 1067 perror(identity_file); 1068 exit(1); 1069 } 1070 /* Try to load the file with empty passphrase. */ 1071 private = key_load_private(identity_file, "", &comment); 1072 if (private == NULL) { 1073 if (identity_passphrase) 1074 old_passphrase = xstrdup(identity_passphrase); 1075 else 1076 old_passphrase = 1077 read_passphrase("Enter old passphrase: ", 1078 RP_ALLOW_STDIN); 1079 private = key_load_private(identity_file, old_passphrase, 1080 &comment); 1081 memset(old_passphrase, 0, strlen(old_passphrase)); 1082 xfree(old_passphrase); 1083 if (private == NULL) { 1084 printf("Bad passphrase.\n"); 1085 exit(1); 1086 } 1087 } 1088 printf("Key has comment '%s'\n", comment); 1089 1090 /* Ask the new passphrase (twice). */ 1091 if (identity_new_passphrase) { 1092 passphrase1 = xstrdup(identity_new_passphrase); 1093 passphrase2 = NULL; 1094 } else { 1095 passphrase1 = 1096 read_passphrase("Enter new passphrase (empty for no " 1097 "passphrase): ", RP_ALLOW_STDIN); 1098 passphrase2 = read_passphrase("Enter same passphrase again: ", 1099 RP_ALLOW_STDIN); 1100 1101 /* Verify that they are the same. */ 1102 if (strcmp(passphrase1, passphrase2) != 0) { 1103 memset(passphrase1, 0, strlen(passphrase1)); 1104 memset(passphrase2, 0, strlen(passphrase2)); 1105 xfree(passphrase1); 1106 xfree(passphrase2); 1107 printf("Pass phrases do not match. Try again.\n"); 1108 exit(1); 1109 } 1110 /* Destroy the other copy. */ 1111 memset(passphrase2, 0, strlen(passphrase2)); 1112 xfree(passphrase2); 1113 } 1114 1115 /* Save the file using the new passphrase. */ 1116 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1117 printf("Saving the key failed: %s.\n", identity_file); 1118 memset(passphrase1, 0, strlen(passphrase1)); 1119 xfree(passphrase1); 1120 key_free(private); 1121 xfree(comment); 1122 exit(1); 1123 } 1124 /* Destroy the passphrase and the copy of the key in memory. */ 1125 memset(passphrase1, 0, strlen(passphrase1)); 1126 xfree(passphrase1); 1127 key_free(private); /* Destroys contents */ 1128 xfree(comment); 1129 1130 printf("Your identification has been saved with the new passphrase.\n"); 1131 exit(0); 1132} 1133 1134/* 1135 * Print the SSHFP RR. 1136 */ 1137static int 1138do_print_resource_record(struct passwd *pw, char *fname, char *hname) 1139{ 1140 Key *public; 1141 char *comment = NULL; 1142 struct stat st; 1143 1144 if (fname == NULL) 1145 ask_filename(pw, "Enter file in which the key is"); 1146 if (stat(fname, &st) < 0) { 1147 if (errno == ENOENT) 1148 return 0; 1149 perror(fname); 1150 exit(1); 1151 } 1152 public = key_load_public(fname, &comment); 1153 if (public != NULL) { 1154 export_dns_rr(hname, public, stdout, print_generic); 1155 key_free(public); 1156 xfree(comment); 1157 return 1; 1158 } 1159 if (comment) 1160 xfree(comment); 1161 1162 printf("failed to read v2 public key from %s.\n", fname); 1163 exit(1); 1164} 1165 1166/* 1167 * Change the comment of a private key file. 1168 */ 1169static void 1170do_change_comment(struct passwd *pw) 1171{ 1172 char new_comment[1024], *comment, *passphrase; 1173 Key *private; 1174 Key *public; 1175 struct stat st; 1176 FILE *f; 1177 int fd; 1178 1179 if (!have_identity) 1180 ask_filename(pw, "Enter file in which the key is"); 1181 if (stat(identity_file, &st) < 0) { 1182 perror(identity_file); 1183 exit(1); 1184 } 1185 private = key_load_private(identity_file, "", &comment); 1186 if (private == NULL) { 1187 if (identity_passphrase) 1188 passphrase = xstrdup(identity_passphrase); 1189 else if (identity_new_passphrase) 1190 passphrase = xstrdup(identity_new_passphrase); 1191 else 1192 passphrase = read_passphrase("Enter passphrase: ", 1193 RP_ALLOW_STDIN); 1194 /* Try to load using the passphrase. */ 1195 private = key_load_private(identity_file, passphrase, &comment); 1196 if (private == NULL) { 1197 memset(passphrase, 0, strlen(passphrase)); 1198 xfree(passphrase); 1199 printf("Bad passphrase.\n"); 1200 exit(1); 1201 } 1202 } else { 1203 passphrase = xstrdup(""); 1204 } 1205 if (private->type != KEY_RSA1) { 1206 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 1207 key_free(private); 1208 exit(1); 1209 } 1210 printf("Key now has comment '%s'\n", comment); 1211 1212 if (identity_comment) { 1213 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1214 } else { 1215 printf("Enter new comment: "); 1216 fflush(stdout); 1217 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1218 memset(passphrase, 0, strlen(passphrase)); 1219 key_free(private); 1220 exit(1); 1221 } 1222 new_comment[strcspn(new_comment, "\n")] = '\0'; 1223 } 1224 1225 /* Save the file using the new passphrase. */ 1226 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 1227 printf("Saving the key failed: %s.\n", identity_file); 1228 memset(passphrase, 0, strlen(passphrase)); 1229 xfree(passphrase); 1230 key_free(private); 1231 xfree(comment); 1232 exit(1); 1233 } 1234 memset(passphrase, 0, strlen(passphrase)); 1235 xfree(passphrase); 1236 public = key_from_private(private); 1237 key_free(private); 1238 1239 strlcat(identity_file, ".pub", sizeof(identity_file)); 1240 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1241 if (fd == -1) { 1242 printf("Could not save your public key in %s\n", identity_file); 1243 exit(1); 1244 } 1245 f = fdopen(fd, "w"); 1246 if (f == NULL) { 1247 printf("fdopen %s failed\n", identity_file); 1248 exit(1); 1249 } 1250 if (!key_write(public, f)) 1251 fprintf(stderr, "write key failed\n"); 1252 key_free(public); 1253 fprintf(f, " %s\n", new_comment); 1254 fclose(f); 1255 1256 xfree(comment); 1257 1258 printf("The comment in your key file has been changed.\n"); 1259 exit(0); 1260} 1261 1262static const char * 1263fmt_validity(u_int64_t valid_from, u_int64_t valid_to) 1264{ 1265 char from[32], to[32]; 1266 static char ret[64]; 1267 time_t tt; 1268 struct tm *tm; 1269 1270 *from = *to = '\0'; 1271 if (valid_from == 0 && valid_to == 0xffffffffffffffffULL) 1272 return "forever"; 1273 1274 if (valid_from != 0) { 1275 /* XXX revisit INT_MAX in 2038 :) */ 1276 tt = valid_from > INT_MAX ? INT_MAX : valid_from; 1277 tm = localtime(&tt); 1278 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); 1279 } 1280 if (valid_to != 0xffffffffffffffffULL) { 1281 /* XXX revisit INT_MAX in 2038 :) */ 1282 tt = valid_to > INT_MAX ? INT_MAX : valid_to; 1283 tm = localtime(&tt); 1284 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); 1285 } 1286 1287 if (valid_from == 0) { 1288 snprintf(ret, sizeof(ret), "before %s", to); 1289 return ret; 1290 } 1291 if (valid_to == 0xffffffffffffffffULL) { 1292 snprintf(ret, sizeof(ret), "after %s", from); 1293 return ret; 1294 } 1295 1296 snprintf(ret, sizeof(ret), "from %s to %s", from, to); 1297 return ret; 1298} 1299 1300static void 1301add_flag_option(Buffer *c, const char *name) 1302{ 1303 debug3("%s: %s", __func__, name); 1304 buffer_put_cstring(c, name); 1305 buffer_put_string(c, NULL, 0); 1306} 1307 1308static void 1309add_string_option(Buffer *c, const char *name, const char *value) 1310{ 1311 Buffer b; 1312 1313 debug3("%s: %s=%s", __func__, name, value); 1314 buffer_init(&b); 1315 buffer_put_cstring(&b, value); 1316 1317 buffer_put_cstring(c, name); 1318 buffer_put_string(c, buffer_ptr(&b), buffer_len(&b)); 1319 1320 buffer_free(&b); 1321} 1322 1323#define OPTIONS_CRITICAL 1 1324#define OPTIONS_EXTENSIONS 2 1325static void 1326prepare_options_buf(Buffer *c, int which) 1327{ 1328 buffer_clear(c); 1329 if ((which & OPTIONS_CRITICAL) != 0 && 1330 certflags_command != NULL) 1331 add_string_option(c, "force-command", certflags_command); 1332 if ((which & OPTIONS_EXTENSIONS) != 0 && 1333 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1334 add_flag_option(c, "permit-agent-forwarding"); 1335 if ((which & OPTIONS_EXTENSIONS) != 0 && 1336 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1337 add_flag_option(c, "permit-port-forwarding"); 1338 if ((which & OPTIONS_EXTENSIONS) != 0 && 1339 (certflags_flags & CERTOPT_PTY) != 0) 1340 add_flag_option(c, "permit-pty"); 1341 if ((which & OPTIONS_EXTENSIONS) != 0 && 1342 (certflags_flags & CERTOPT_USER_RC) != 0) 1343 add_flag_option(c, "permit-user-rc"); 1344 if ((which & OPTIONS_EXTENSIONS) != 0 && 1345 (certflags_flags & CERTOPT_X_FWD) != 0) 1346 add_flag_option(c, "permit-X11-forwarding"); 1347 if ((which & OPTIONS_CRITICAL) != 0 && 1348 certflags_src_addr != NULL) 1349 add_string_option(c, "source-address", certflags_src_addr); 1350} 1351 1352static Key * 1353load_pkcs11_key(char *path) 1354{ 1355#ifdef ENABLE_PKCS11 1356 Key **keys = NULL, *public, *private = NULL; 1357 int i, nkeys; 1358 1359 if ((public = key_load_public(path, NULL)) == NULL) 1360 fatal("Couldn't load CA public key \"%s\"", path); 1361 1362 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1363 debug3("%s: %d keys", __func__, nkeys); 1364 if (nkeys <= 0) 1365 fatal("cannot read public key from pkcs11"); 1366 for (i = 0; i < nkeys; i++) { 1367 if (key_equal_public(public, keys[i])) { 1368 private = keys[i]; 1369 continue; 1370 } 1371 key_free(keys[i]); 1372 } 1373 xfree(keys); 1374 key_free(public); 1375 return private; 1376#else 1377 fatal("no pkcs11 support"); 1378#endif /* ENABLE_PKCS11 */ 1379} 1380 1381static void 1382do_ca_sign(struct passwd *pw, int argc, char **argv) 1383{ 1384 int i, fd; 1385 u_int n; 1386 Key *ca, *public; 1387 char *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1388 FILE *f; 1389 int v00 = 0; /* legacy keys */ 1390 1391 if (key_type_name != NULL) { 1392 switch (key_type_from_name(key_type_name)) { 1393 case KEY_RSA_CERT_V00: 1394 case KEY_DSA_CERT_V00: 1395 v00 = 1; 1396 break; 1397 case KEY_UNSPEC: 1398 if (strcasecmp(key_type_name, "v00") == 0) { 1399 v00 = 1; 1400 break; 1401 } else if (strcasecmp(key_type_name, "v01") == 0) 1402 break; 1403 /* FALLTHROUGH */ 1404 default: 1405 fprintf(stderr, "unknown key type %s\n", key_type_name); 1406 exit(1); 1407 } 1408 } 1409 1410 pkcs11_init(1); 1411 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1412 if (pkcs11provider != NULL) { 1413 if ((ca = load_pkcs11_key(tmp)) == NULL) 1414 fatal("No PKCS#11 key matching %s found", ca_key_path); 1415 } else if ((ca = load_identity(tmp)) == NULL) 1416 fatal("Couldn't load CA key \"%s\"", tmp); 1417 xfree(tmp); 1418 1419 for (i = 0; i < argc; i++) { 1420 /* Split list of principals */ 1421 n = 0; 1422 if (cert_principals != NULL) { 1423 otmp = tmp = xstrdup(cert_principals); 1424 plist = NULL; 1425 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1426 plist = xrealloc(plist, n + 1, sizeof(*plist)); 1427 if (*(plist[n] = xstrdup(cp)) == '\0') 1428 fatal("Empty principal name"); 1429 } 1430 xfree(otmp); 1431 } 1432 1433 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1434 if ((public = key_load_public(tmp, &comment)) == NULL) 1435 fatal("%s: unable to open \"%s\"", __func__, tmp); 1436 if (public->type != KEY_RSA && public->type != KEY_DSA && 1437 public->type != KEY_ECDSA) 1438 fatal("%s: key \"%s\" type %s cannot be certified", 1439 __func__, tmp, key_type(public)); 1440 1441 /* Prepare certificate to sign */ 1442 if (key_to_certified(public, v00) != 0) 1443 fatal("Could not upgrade key %s to certificate", tmp); 1444 public->cert->type = cert_key_type; 1445 public->cert->serial = (u_int64_t)cert_serial; 1446 public->cert->key_id = xstrdup(cert_key_id); 1447 public->cert->nprincipals = n; 1448 public->cert->principals = plist; 1449 public->cert->valid_after = cert_valid_from; 1450 public->cert->valid_before = cert_valid_to; 1451 if (v00) { 1452 prepare_options_buf(&public->cert->critical, 1453 OPTIONS_CRITICAL|OPTIONS_EXTENSIONS); 1454 } else { 1455 prepare_options_buf(&public->cert->critical, 1456 OPTIONS_CRITICAL); 1457 prepare_options_buf(&public->cert->extensions, 1458 OPTIONS_EXTENSIONS); 1459 } 1460 public->cert->signature_key = key_from_private(ca); 1461 1462 if (key_certify(public, ca) != 0) 1463 fatal("Couldn't not certify key %s", tmp); 1464 1465 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1466 *cp = '\0'; 1467 xasprintf(&out, "%s-cert.pub", tmp); 1468 xfree(tmp); 1469 1470 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1471 fatal("Could not open \"%s\" for writing: %s", out, 1472 strerror(errno)); 1473 if ((f = fdopen(fd, "w")) == NULL) 1474 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1475 if (!key_write(public, f)) 1476 fatal("Could not write certified key to %s", out); 1477 fprintf(f, " %s\n", comment); 1478 fclose(f); 1479 1480 if (!quiet) { 1481 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1482 "valid %s", key_cert_type(public), 1483 out, public->cert->key_id, 1484 (unsigned long long)public->cert->serial, 1485 cert_principals != NULL ? " for " : "", 1486 cert_principals != NULL ? cert_principals : "", 1487 fmt_validity(cert_valid_from, cert_valid_to)); 1488 } 1489 1490 key_free(public); 1491 xfree(out); 1492 } 1493 pkcs11_terminate(); 1494 exit(0); 1495} 1496 1497static u_int64_t 1498parse_relative_time(const char *s, time_t now) 1499{ 1500 int64_t mul, secs; 1501 1502 mul = *s == '-' ? -1 : 1; 1503 1504 if ((secs = convtime(s + 1)) == -1) 1505 fatal("Invalid relative certificate time %s", s); 1506 if (mul == -1 && secs > now) 1507 fatal("Certificate time %s cannot be represented", s); 1508 return now + (u_int64_t)(secs * mul); 1509} 1510 1511static u_int64_t 1512parse_absolute_time(const char *s) 1513{ 1514 struct tm tm; 1515 time_t tt; 1516 char buf[32], *fmt; 1517 1518 /* 1519 * POSIX strptime says "The application shall ensure that there 1520 * is white-space or other non-alphanumeric characters between 1521 * any two conversion specifications" so arrange things this way. 1522 */ 1523 switch (strlen(s)) { 1524 case 8: 1525 fmt = "%Y-%m-%d"; 1526 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1527 break; 1528 case 14: 1529 fmt = "%Y-%m-%dT%H:%M:%S"; 1530 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1531 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1532 break; 1533 default: 1534 fatal("Invalid certificate time format %s", s); 1535 } 1536 1537 bzero(&tm, sizeof(tm)); 1538 if (strptime(buf, fmt, &tm) == NULL) 1539 fatal("Invalid certificate time %s", s); 1540 if ((tt = mktime(&tm)) < 0) 1541 fatal("Certificate time %s cannot be represented", s); 1542 return (u_int64_t)tt; 1543} 1544 1545static void 1546parse_cert_times(char *timespec) 1547{ 1548 char *from, *to; 1549 time_t now = time(NULL); 1550 int64_t secs; 1551 1552 /* +timespec relative to now */ 1553 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1554 if ((secs = convtime(timespec + 1)) == -1) 1555 fatal("Invalid relative certificate life %s", timespec); 1556 cert_valid_to = now + secs; 1557 /* 1558 * Backdate certificate one minute to avoid problems on hosts 1559 * with poorly-synchronised clocks. 1560 */ 1561 cert_valid_from = ((now - 59)/ 60) * 60; 1562 return; 1563 } 1564 1565 /* 1566 * from:to, where 1567 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1568 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1569 */ 1570 from = xstrdup(timespec); 1571 to = strchr(from, ':'); 1572 if (to == NULL || from == to || *(to + 1) == '\0') 1573 fatal("Invalid certificate life specification %s", timespec); 1574 *to++ = '\0'; 1575 1576 if (*from == '-' || *from == '+') 1577 cert_valid_from = parse_relative_time(from, now); 1578 else 1579 cert_valid_from = parse_absolute_time(from); 1580 1581 if (*to == '-' || *to == '+') 1582 cert_valid_to = parse_relative_time(to, cert_valid_from); 1583 else 1584 cert_valid_to = parse_absolute_time(to); 1585 1586 if (cert_valid_to <= cert_valid_from) 1587 fatal("Empty certificate validity interval"); 1588 xfree(from); 1589} 1590 1591static void 1592add_cert_option(char *opt) 1593{ 1594 char *val; 1595 1596 if (strcmp(opt, "clear") == 0) 1597 certflags_flags = 0; 1598 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1599 certflags_flags &= ~CERTOPT_X_FWD; 1600 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1601 certflags_flags |= CERTOPT_X_FWD; 1602 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1603 certflags_flags &= ~CERTOPT_AGENT_FWD; 1604 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1605 certflags_flags |= CERTOPT_AGENT_FWD; 1606 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1607 certflags_flags &= ~CERTOPT_PORT_FWD; 1608 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1609 certflags_flags |= CERTOPT_PORT_FWD; 1610 else if (strcasecmp(opt, "no-pty") == 0) 1611 certflags_flags &= ~CERTOPT_PTY; 1612 else if (strcasecmp(opt, "permit-pty") == 0) 1613 certflags_flags |= CERTOPT_PTY; 1614 else if (strcasecmp(opt, "no-user-rc") == 0) 1615 certflags_flags &= ~CERTOPT_USER_RC; 1616 else if (strcasecmp(opt, "permit-user-rc") == 0) 1617 certflags_flags |= CERTOPT_USER_RC; 1618 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1619 val = opt + 14; 1620 if (*val == '\0') 1621 fatal("Empty force-command option"); 1622 if (certflags_command != NULL) 1623 fatal("force-command already specified"); 1624 certflags_command = xstrdup(val); 1625 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1626 val = opt + 15; 1627 if (*val == '\0') 1628 fatal("Empty source-address option"); 1629 if (certflags_src_addr != NULL) 1630 fatal("source-address already specified"); 1631 if (addr_match_cidr_list(NULL, val) != 0) 1632 fatal("Invalid source-address list"); 1633 certflags_src_addr = xstrdup(val); 1634 } else 1635 fatal("Unsupported certificate option \"%s\"", opt); 1636} 1637 1638static void 1639show_options(const Buffer *optbuf, int v00, int in_critical) 1640{ 1641 u_char *name, *data; 1642 u_int dlen; 1643 Buffer options, option; 1644 1645 buffer_init(&options); 1646 buffer_append(&options, buffer_ptr(optbuf), buffer_len(optbuf)); 1647 1648 buffer_init(&option); 1649 while (buffer_len(&options) != 0) { 1650 name = buffer_get_string(&options, NULL); 1651 data = buffer_get_string_ptr(&options, &dlen); 1652 buffer_append(&option, data, dlen); 1653 printf(" %s", name); 1654 if ((v00 || !in_critical) && 1655 (strcmp(name, "permit-X11-forwarding") == 0 || 1656 strcmp(name, "permit-agent-forwarding") == 0 || 1657 strcmp(name, "permit-port-forwarding") == 0 || 1658 strcmp(name, "permit-pty") == 0 || 1659 strcmp(name, "permit-user-rc") == 0)) 1660 printf("\n"); 1661 else if ((v00 || in_critical) && 1662 (strcmp(name, "force-command") == 0 || 1663 strcmp(name, "source-address") == 0)) { 1664 data = buffer_get_string(&option, NULL); 1665 printf(" %s\n", data); 1666 xfree(data); 1667 } else { 1668 printf(" UNKNOWN OPTION (len %u)\n", 1669 buffer_len(&option)); 1670 buffer_clear(&option); 1671 } 1672 xfree(name); 1673 if (buffer_len(&option) != 0) 1674 fatal("Option corrupt: extra data at end"); 1675 } 1676 buffer_free(&option); 1677 buffer_free(&options); 1678} 1679 1680static void 1681do_show_cert(struct passwd *pw) 1682{ 1683 Key *key; 1684 struct stat st; 1685 char *key_fp, *ca_fp; 1686 u_int i, v00; 1687 1688 if (!have_identity) 1689 ask_filename(pw, "Enter file in which the key is"); 1690 if (stat(identity_file, &st) < 0) 1691 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1692 if ((key = key_load_public(identity_file, NULL)) == NULL) 1693 fatal("%s is not a public key", identity_file); 1694 if (!key_is_cert(key)) 1695 fatal("%s is not a certificate", identity_file); 1696 v00 = key->type == KEY_RSA_CERT_V00 || key->type == KEY_DSA_CERT_V00; 1697 1698 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); 1699 ca_fp = key_fingerprint(key->cert->signature_key, 1700 SSH_FP_MD5, SSH_FP_HEX); 1701 1702 printf("%s:\n", identity_file); 1703 printf(" Type: %s %s certificate\n", key_ssh_name(key), 1704 key_cert_type(key)); 1705 printf(" Public key: %s %s\n", key_type(key), key_fp); 1706 printf(" Signing CA: %s %s\n", 1707 key_type(key->cert->signature_key), ca_fp); 1708 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1709 if (!v00) { 1710 printf(" Serial: %llu\n", 1711 (unsigned long long)key->cert->serial); 1712 } 1713 printf(" Valid: %s\n", 1714 fmt_validity(key->cert->valid_after, key->cert->valid_before)); 1715 printf(" Principals: "); 1716 if (key->cert->nprincipals == 0) 1717 printf("(none)\n"); 1718 else { 1719 for (i = 0; i < key->cert->nprincipals; i++) 1720 printf("\n %s", 1721 key->cert->principals[i]); 1722 printf("\n"); 1723 } 1724 printf(" Critical Options: "); 1725 if (buffer_len(&key->cert->critical) == 0) 1726 printf("(none)\n"); 1727 else { 1728 printf("\n"); 1729 show_options(&key->cert->critical, v00, 1); 1730 } 1731 if (!v00) { 1732 printf(" Extensions: "); 1733 if (buffer_len(&key->cert->extensions) == 0) 1734 printf("(none)\n"); 1735 else { 1736 printf("\n"); 1737 show_options(&key->cert->extensions, v00, 0); 1738 } 1739 } 1740 exit(0); 1741} 1742 1743static void 1744usage(void) 1745{ 1746 fprintf(stderr, "usage: %s [options]\n", __progname); 1747 fprintf(stderr, "Options:\n"); 1748 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); 1749 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 1750 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 1751 fprintf(stderr, " -C comment Provide new comment.\n"); 1752 fprintf(stderr, " -c Change comment in private and public key files.\n"); 1753#ifdef ENABLE_PKCS11 1754 fprintf(stderr, " -D pkcs11 Download public key from pkcs11 token.\n"); 1755#endif 1756 fprintf(stderr, " -e Export OpenSSH to foreign format key file.\n"); 1757 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); 1758 fprintf(stderr, " -f filename Filename of the key file.\n"); 1759 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); 1760 fprintf(stderr, " -g Use generic DNS resource record format.\n"); 1761 fprintf(stderr, " -H Hash names in known_hosts file.\n"); 1762 fprintf(stderr, " -h Generate host certificate instead of a user certificate.\n"); 1763 fprintf(stderr, " -I key_id Key identifier to include in certificate.\n"); 1764 fprintf(stderr, " -i Import foreign format to OpenSSH key file.\n"); 1765 fprintf(stderr, " -L Print the contents of a certificate.\n"); 1766 fprintf(stderr, " -l Show fingerprint of key file.\n"); 1767 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); 1768 fprintf(stderr, " -m key_fmt Conversion format for -e/-i (PEM|PKCS8|RFC4716).\n"); 1769 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 1770 fprintf(stderr, " -n name,... User/host principal names to include in certificate\n"); 1771 fprintf(stderr, " -O option Specify a certificate option.\n"); 1772 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 1773 fprintf(stderr, " -p Change passphrase of private key file.\n"); 1774 fprintf(stderr, " -q Quiet.\n"); 1775 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); 1776 fprintf(stderr, " -r hostname Print DNS resource record.\n"); 1777 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); 1778 fprintf(stderr, " -s ca_key Certify keys with CA key.\n"); 1779 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); 1780 fprintf(stderr, " -t type Specify type of key to create.\n"); 1781 fprintf(stderr, " -V from:to Specify certificate validity interval.\n"); 1782 fprintf(stderr, " -v Verbose.\n"); 1783 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); 1784 fprintf(stderr, " -y Read private key file and print public key.\n"); 1785 fprintf(stderr, " -z serial Specify a serial number.\n"); 1786 1787 exit(1); 1788} 1789 1790/* 1791 * Main program for key management. 1792 */ 1793int 1794main(int argc, char **argv) 1795{ 1796 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 1797 char out_file[MAXPATHLEN], *rr_hostname = NULL; 1798 Key *private, *public; 1799 struct passwd *pw; 1800 struct stat st; 1801 int opt, type, fd; 1802 u_int maxbits; 1803 u_int32_t memory = 0, generator_wanted = 0, trials = 100; 1804 int do_gen_candidates = 0, do_screen_candidates = 0; 1805 BIGNUM *start = NULL; 1806 FILE *f; 1807 const char *errstr; 1808 1809 extern int optind; 1810 extern char *optarg; 1811 1812 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 1813 sanitise_stdfd(); 1814 1815 __progname = ssh_get_progname(argv[0]); 1816 1817 OpenSSL_add_all_algorithms(); 1818 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 1819 1820 init_rng(); 1821 seed_rng(); 1822 1823 /* we need this for the home * directory. */ 1824 pw = getpwuid(getuid()); 1825 if (!pw) { 1826 printf("You don't exist, go away!\n"); 1827 exit(1); 1828 } 1829 if (gethostname(hostname, sizeof(hostname)) < 0) { 1830 perror("gethostname"); 1831 exit(1); 1832 } 1833 1834 while ((opt = getopt(argc, argv, "degiqpclBHLhvxXyF:b:f:t:D:I:P:m:N:n:" 1835 "O:C:r:g:R:T:G:M:S:s:a:V:W:z:")) != -1) { 1836 switch (opt) { 1837 case 'b': 1838 bits = (u_int32_t)strtonum(optarg, 256, 32768, &errstr); 1839 if (errstr) 1840 fatal("Bits has bad value %s (%s)", 1841 optarg, errstr); 1842 break; 1843 case 'F': 1844 find_host = 1; 1845 rr_hostname = optarg; 1846 break; 1847 case 'H': 1848 hash_hosts = 1; 1849 break; 1850 case 'I': 1851 cert_key_id = optarg; 1852 break; 1853 case 'R': 1854 delete_host = 1; 1855 rr_hostname = optarg; 1856 break; 1857 case 'L': 1858 show_cert = 1; 1859 break; 1860 case 'l': 1861 print_fingerprint = 1; 1862 break; 1863 case 'B': 1864 print_bubblebabble = 1; 1865 break; 1866 case 'm': 1867 if (strcasecmp(optarg, "RFC4716") == 0 || 1868 strcasecmp(optarg, "ssh2") == 0) { 1869 convert_format = FMT_RFC4716; 1870 break; 1871 } 1872 if (strcasecmp(optarg, "PKCS8") == 0) { 1873 convert_format = FMT_PKCS8; 1874 break; 1875 } 1876 if (strcasecmp(optarg, "PEM") == 0) { 1877 convert_format = FMT_PEM; 1878 break; 1879 } 1880 fatal("Unsupported conversion format \"%s\"", optarg); 1881 case 'n': 1882 cert_principals = optarg; 1883 break; 1884 case 'p': 1885 change_passphrase = 1; 1886 break; 1887 case 'c': 1888 change_comment = 1; 1889 break; 1890 case 'f': 1891 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= 1892 sizeof(identity_file)) 1893 fatal("Identity filename too long"); 1894 have_identity = 1; 1895 break; 1896 case 'g': 1897 print_generic = 1; 1898 break; 1899 case 'P': 1900 identity_passphrase = optarg; 1901 break; 1902 case 'N': 1903 identity_new_passphrase = optarg; 1904 break; 1905 case 'O': 1906 add_cert_option(optarg); 1907 break; 1908 case 'C': 1909 identity_comment = optarg; 1910 break; 1911 case 'q': 1912 quiet = 1; 1913 break; 1914 case 'e': 1915 case 'x': 1916 /* export key */ 1917 convert_to = 1; 1918 break; 1919 case 'h': 1920 cert_key_type = SSH2_CERT_TYPE_HOST; 1921 certflags_flags = 0; 1922 break; 1923 case 'i': 1924 case 'X': 1925 /* import key */ 1926 convert_from = 1; 1927 break; 1928 case 'y': 1929 print_public = 1; 1930 break; 1931 case 'd': 1932 key_type_name = "dsa"; 1933 break; 1934 case 's': 1935 ca_key_path = optarg; 1936 break; 1937 case 't': 1938 key_type_name = optarg; 1939 break; 1940 case 'D': 1941 pkcs11provider = optarg; 1942 break; 1943 case 'v': 1944 if (log_level == SYSLOG_LEVEL_INFO) 1945 log_level = SYSLOG_LEVEL_DEBUG1; 1946 else { 1947 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 1948 log_level < SYSLOG_LEVEL_DEBUG3) 1949 log_level++; 1950 } 1951 break; 1952 case 'r': 1953 rr_hostname = optarg; 1954 break; 1955 case 'W': 1956 generator_wanted = (u_int32_t)strtonum(optarg, 1, 1957 UINT_MAX, &errstr); 1958 if (errstr) 1959 fatal("Desired generator has bad value: %s (%s)", 1960 optarg, errstr); 1961 break; 1962 case 'a': 1963 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 1964 if (errstr) 1965 fatal("Invalid number of trials: %s (%s)", 1966 optarg, errstr); 1967 break; 1968 case 'M': 1969 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 1970 if (errstr) 1971 fatal("Memory limit is %s: %s", errstr, optarg); 1972 break; 1973 case 'G': 1974 do_gen_candidates = 1; 1975 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 1976 sizeof(out_file)) 1977 fatal("Output filename too long"); 1978 break; 1979 case 'T': 1980 do_screen_candidates = 1; 1981 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 1982 sizeof(out_file)) 1983 fatal("Output filename too long"); 1984 break; 1985 case 'S': 1986 /* XXX - also compare length against bits */ 1987 if (BN_hex2bn(&start, optarg) == 0) 1988 fatal("Invalid start point."); 1989 break; 1990 case 'V': 1991 parse_cert_times(optarg); 1992 break; 1993 case 'z': 1994 cert_serial = strtonum(optarg, 0, LLONG_MAX, &errstr); 1995 if (errstr) 1996 fatal("Invalid serial number: %s", errstr); 1997 break; 1998 case '?': 1999 default: 2000 usage(); 2001 } 2002 } 2003 2004 /* reinit */ 2005 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2006 2007 argv += optind; 2008 argc -= optind; 2009 2010 if (ca_key_path != NULL) { 2011 if (argc < 1) { 2012 printf("Too few arguments.\n"); 2013 usage(); 2014 } 2015 } else if (argc > 0) { 2016 printf("Too many arguments.\n"); 2017 usage(); 2018 } 2019 if (change_passphrase && change_comment) { 2020 printf("Can only have one of -p and -c.\n"); 2021 usage(); 2022 } 2023 if (print_fingerprint && (delete_host || hash_hosts)) { 2024 printf("Cannot use -l with -D or -R.\n"); 2025 usage(); 2026 } 2027 if (ca_key_path != NULL) { 2028 if (cert_key_id == NULL) 2029 fatal("Must specify key id (-I) when certifying"); 2030 do_ca_sign(pw, argc, argv); 2031 } 2032 if (show_cert) 2033 do_show_cert(pw); 2034 if (delete_host || hash_hosts || find_host) 2035 do_known_hosts(pw, rr_hostname); 2036 if (print_fingerprint || print_bubblebabble) 2037 do_fingerprint(pw); 2038 if (change_passphrase) 2039 do_change_passphrase(pw); 2040 if (change_comment) 2041 do_change_comment(pw); 2042 if (convert_to) 2043 do_convert_to(pw); 2044 if (convert_from) 2045 do_convert_from(pw); 2046 if (print_public) 2047 do_print_public(pw); 2048 if (rr_hostname != NULL) { 2049 unsigned int n = 0; 2050 2051 if (have_identity) { 2052 n = do_print_resource_record(pw, 2053 identity_file, rr_hostname); 2054 if (n == 0) { 2055 perror(identity_file); 2056 exit(1); 2057 } 2058 exit(0); 2059 } else { 2060 2061 n += do_print_resource_record(pw, 2062 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2063 n += do_print_resource_record(pw, 2064 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2065 2066 if (n == 0) 2067 fatal("no keys found."); 2068 exit(0); 2069 } 2070 } 2071 if (pkcs11provider != NULL) 2072 do_download(pw); 2073 2074 if (do_gen_candidates) { 2075 FILE *out = fopen(out_file, "w"); 2076 2077 if (out == NULL) { 2078 error("Couldn't open modulus candidate file \"%s\": %s", 2079 out_file, strerror(errno)); 2080 return (1); 2081 } 2082 if (bits == 0) 2083 bits = DEFAULT_BITS; 2084 if (gen_candidates(out, memory, bits, start) != 0) 2085 fatal("modulus candidate generation failed"); 2086 2087 return (0); 2088 } 2089 2090 if (do_screen_candidates) { 2091 FILE *in; 2092 FILE *out = fopen(out_file, "w"); 2093 2094 if (have_identity && strcmp(identity_file, "-") != 0) { 2095 if ((in = fopen(identity_file, "r")) == NULL) { 2096 fatal("Couldn't open modulus candidate " 2097 "file \"%s\": %s", identity_file, 2098 strerror(errno)); 2099 } 2100 } else 2101 in = stdin; 2102 2103 if (out == NULL) { 2104 fatal("Couldn't open moduli file \"%s\": %s", 2105 out_file, strerror(errno)); 2106 } 2107 if (prime_test(in, out, trials, generator_wanted) != 0) 2108 fatal("modulus screening failed"); 2109 return (0); 2110 } 2111 2112 arc4random_stir(); 2113 2114 if (key_type_name == NULL) 2115 key_type_name = "rsa"; 2116 2117 type = key_type_from_name(key_type_name); 2118 if (type == KEY_UNSPEC) { 2119 fprintf(stderr, "unknown key type %s\n", key_type_name); 2120 exit(1); 2121 } 2122 if (bits == 0) { 2123 if (type == KEY_DSA) 2124 bits = DEFAULT_BITS_DSA; 2125 else if (type == KEY_ECDSA) 2126 bits = DEFAULT_BITS_ECDSA; 2127 else 2128 bits = DEFAULT_BITS; 2129 } 2130 maxbits = (type == KEY_DSA) ? 2131 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 2132 if (bits > maxbits) { 2133 fprintf(stderr, "key bits exceeds maximum %d\n", maxbits); 2134 exit(1); 2135 } 2136 if (type == KEY_DSA && bits != 1024) 2137 fatal("DSA keys must be 1024 bits"); 2138 else if (type != KEY_ECDSA && bits < 768) 2139 fatal("Key must at least be 768 bits"); 2140 else if (type == KEY_ECDSA && key_ecdsa_bits_to_nid(bits) == -1) 2141 fatal("Invalid ECDSA key length - valid lengths are " 2142 "256, 384 or 521 bits"); 2143 if (!quiet) 2144 printf("Generating public/private %s key pair.\n", key_type_name); 2145 private = key_generate(type, bits); 2146 if (private == NULL) { 2147 fprintf(stderr, "key_generate failed\n"); 2148 exit(1); 2149 } 2150 public = key_from_private(private); 2151 2152 if (!have_identity) 2153 ask_filename(pw, "Enter file in which to save the key"); 2154 2155 /* Create ~/.ssh directory if it doesn't already exist. */ 2156 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2157 pw->pw_dir, _PATH_SSH_USER_DIR); 2158 if (strstr(identity_file, dotsshdir) != NULL) { 2159 if (stat(dotsshdir, &st) < 0) { 2160 if (errno != ENOENT) { 2161 error("Could not stat %s: %s", dotsshdir, 2162 strerror(errno)); 2163 } else if (mkdir(dotsshdir, 0700) < 0) { 2164 error("Could not create directory '%s': %s", 2165 dotsshdir, strerror(errno)); 2166 } else if (!quiet) 2167 printf("Created directory '%s'.\n", dotsshdir); 2168 } 2169 } 2170 /* If the file already exists, ask the user to confirm. */ 2171 if (stat(identity_file, &st) >= 0) { 2172 char yesno[3]; 2173 printf("%s already exists.\n", identity_file); 2174 printf("Overwrite (y/n)? "); 2175 fflush(stdout); 2176 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2177 exit(1); 2178 if (yesno[0] != 'y' && yesno[0] != 'Y') 2179 exit(1); 2180 } 2181 /* Ask for a passphrase (twice). */ 2182 if (identity_passphrase) 2183 passphrase1 = xstrdup(identity_passphrase); 2184 else if (identity_new_passphrase) 2185 passphrase1 = xstrdup(identity_new_passphrase); 2186 else { 2187passphrase_again: 2188 passphrase1 = 2189 read_passphrase("Enter passphrase (empty for no " 2190 "passphrase): ", RP_ALLOW_STDIN); 2191 passphrase2 = read_passphrase("Enter same passphrase again: ", 2192 RP_ALLOW_STDIN); 2193 if (strcmp(passphrase1, passphrase2) != 0) { 2194 /* 2195 * The passphrases do not match. Clear them and 2196 * retry. 2197 */ 2198 memset(passphrase1, 0, strlen(passphrase1)); 2199 memset(passphrase2, 0, strlen(passphrase2)); 2200 xfree(passphrase1); 2201 xfree(passphrase2); 2202 printf("Passphrases do not match. Try again.\n"); 2203 goto passphrase_again; 2204 } 2205 /* Clear the other copy of the passphrase. */ 2206 memset(passphrase2, 0, strlen(passphrase2)); 2207 xfree(passphrase2); 2208 } 2209 2210 if (identity_comment) { 2211 strlcpy(comment, identity_comment, sizeof(comment)); 2212 } else { 2213 /* Create default comment field for the passphrase. */ 2214 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2215 } 2216 2217 /* Save the key with the given passphrase and comment. */ 2218 if (!key_save_private(private, identity_file, passphrase1, comment)) { 2219 printf("Saving the key failed: %s.\n", identity_file); 2220 memset(passphrase1, 0, strlen(passphrase1)); 2221 xfree(passphrase1); 2222 exit(1); 2223 } 2224 /* Clear the passphrase. */ 2225 memset(passphrase1, 0, strlen(passphrase1)); 2226 xfree(passphrase1); 2227 2228 /* Clear the private key and the random number generator. */ 2229 key_free(private); 2230 arc4random_stir(); 2231 2232 if (!quiet) 2233 printf("Your identification has been saved in %s.\n", identity_file); 2234 2235 strlcat(identity_file, ".pub", sizeof(identity_file)); 2236 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 2237 if (fd == -1) { 2238 printf("Could not save your public key in %s\n", identity_file); 2239 exit(1); 2240 } 2241 f = fdopen(fd, "w"); 2242 if (f == NULL) { 2243 printf("fdopen %s failed\n", identity_file); 2244 exit(1); 2245 } 2246 if (!key_write(public, f)) 2247 fprintf(stderr, "write key failed\n"); 2248 fprintf(f, " %s\n", comment); 2249 fclose(f); 2250 2251 if (!quiet) { 2252 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 2253 char *ra = key_fingerprint(public, SSH_FP_MD5, 2254 SSH_FP_RANDOMART); 2255 printf("Your public key has been saved in %s.\n", 2256 identity_file); 2257 printf("The key fingerprint is:\n"); 2258 printf("%s %s\n", fp, comment); 2259 printf("The key's randomart image is:\n"); 2260 printf("%s\n", ra); 2261 xfree(ra); 2262 xfree(fp); 2263 } 2264 2265 key_free(public); 2266 exit(0); 2267} 2268