1/* $OpenBSD: ssh-keygen.c,v 1.225 2013/02/10 23:32:10 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#ifdef __APPLE_CRYPTO__ 23#include "ossl-evp.h" 24#include "ossl-pem.h" 25#else 26#include <openssl/evp.h> 27#include <openssl/pem.h> 28#endif 29#include "openbsd-compat/openssl-compat.h" 30 31#include <errno.h> 32#include <fcntl.h> 33#include <netdb.h> 34#ifdef HAVE_PATHS_H 35# include <paths.h> 36#endif 37#include <pwd.h> 38#include <stdarg.h> 39#include <stdio.h> 40#include <stdlib.h> 41#include <string.h> 42#include <unistd.h> 43 44#include "xmalloc.h" 45#include "key.h" 46#include "rsa.h" 47#include "authfile.h" 48#include "uuencode.h" 49#include "buffer.h" 50#include "pathnames.h" 51#include "log.h" 52#include "misc.h" 53#include "match.h" 54#include "hostfile.h" 55#include "dns.h" 56#include "ssh.h" 57#include "ssh2.h" 58#include "ssh-pkcs11.h" 59#include "atomicio.h" 60#include "krl.h" 61 62/* Number of bits in the RSA/DSA key. This value can be set on the command line. */ 63#define DEFAULT_BITS 2048 64#define DEFAULT_BITS_DSA 1024 65#define DEFAULT_BITS_ECDSA 256 66u_int32_t bits = 0; 67 68/* 69 * Flag indicating that we just want to change the passphrase. This can be 70 * set on the command line. 71 */ 72int change_passphrase = 0; 73 74/* 75 * Flag indicating that we just want to change the comment. This can be set 76 * on the command line. 77 */ 78int change_comment = 0; 79 80int quiet = 0; 81 82int log_level = SYSLOG_LEVEL_INFO; 83 84/* Flag indicating that we want to hash a known_hosts file */ 85int hash_hosts = 0; 86/* Flag indicating that we want lookup a host in known_hosts file */ 87int find_host = 0; 88/* Flag indicating that we want to delete a host from a known_hosts file */ 89int delete_host = 0; 90 91/* Flag indicating that we want to show the contents of a certificate */ 92int show_cert = 0; 93 94/* Flag indicating that we just want to see the key fingerprint */ 95int print_fingerprint = 0; 96int print_bubblebabble = 0; 97 98/* The identity file name, given on the command line or entered by the user. */ 99char identity_file[1024]; 100int have_identity = 0; 101 102/* This is set to the passphrase if given on the command line. */ 103char *identity_passphrase = NULL; 104 105/* This is set to the new passphrase if given on the command line. */ 106char *identity_new_passphrase = NULL; 107 108/* This is set to the new comment if given on the command line. */ 109char *identity_comment = NULL; 110 111/* Path to CA key when certifying keys. */ 112char *ca_key_path = NULL; 113 114/* Certificate serial number */ 115unsigned long long cert_serial = 0; 116 117/* Key type when certifying */ 118u_int cert_key_type = SSH2_CERT_TYPE_USER; 119 120/* "key ID" of signed key */ 121char *cert_key_id = NULL; 122 123/* Comma-separated list of principal names for certifying keys */ 124char *cert_principals = NULL; 125 126/* Validity period for certificates */ 127u_int64_t cert_valid_from = 0; 128u_int64_t cert_valid_to = ~0ULL; 129 130/* Certificate options */ 131#define CERTOPT_X_FWD (1) 132#define CERTOPT_AGENT_FWD (1<<1) 133#define CERTOPT_PORT_FWD (1<<2) 134#define CERTOPT_PTY (1<<3) 135#define CERTOPT_USER_RC (1<<4) 136#define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 137 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 138u_int32_t certflags_flags = CERTOPT_DEFAULT; 139char *certflags_command = NULL; 140char *certflags_src_addr = NULL; 141 142/* Conversion to/from various formats */ 143int convert_to = 0; 144int convert_from = 0; 145enum { 146 FMT_RFC4716, 147 FMT_PKCS8, 148 FMT_PEM 149} convert_format = FMT_RFC4716; 150int print_public = 0; 151int print_generic = 0; 152 153char *key_type_name = NULL; 154 155/* Load key from this PKCS#11 provider */ 156char *pkcs11provider = NULL; 157 158/* argv0 */ 159extern char *__progname; 160 161char hostname[MAXHOSTNAMELEN]; 162 163/* moduli.c */ 164int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 165int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 166 unsigned long); 167 168static void 169type_bits_valid(int type, u_int32_t *bitsp) 170{ 171 u_int maxbits; 172 173 if (type == KEY_UNSPEC) { 174 fprintf(stderr, "unknown key type %s\n", key_type_name); 175 exit(1); 176 } 177 if (*bitsp == 0) { 178 if (type == KEY_DSA) 179 *bitsp = DEFAULT_BITS_DSA; 180 else if (type == KEY_ECDSA) 181 *bitsp = DEFAULT_BITS_ECDSA; 182 else 183 *bitsp = DEFAULT_BITS; 184 } 185 maxbits = (type == KEY_DSA) ? 186 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 187 if (*bitsp > maxbits) { 188 fprintf(stderr, "key bits exceeds maximum %d\n", maxbits); 189 exit(1); 190 } 191 if (type == KEY_DSA && *bitsp != 1024) 192 fatal("DSA keys must be 1024 bits"); 193 else if (type != KEY_ECDSA && *bitsp < 768) 194 fatal("Key must at least be 768 bits"); 195 else if (type == KEY_ECDSA && key_ecdsa_bits_to_nid(*bitsp) == -1) 196 fatal("Invalid ECDSA key length - valid lengths are " 197 "256, 384 or 521 bits"); 198} 199 200static void 201ask_filename(struct passwd *pw, const char *prompt) 202{ 203 char buf[1024]; 204 char *name = NULL; 205 206 if (key_type_name == NULL) 207 name = _PATH_SSH_CLIENT_ID_RSA; 208 else { 209 switch (key_type_from_name(key_type_name)) { 210 case KEY_RSA1: 211 name = _PATH_SSH_CLIENT_IDENTITY; 212 break; 213 case KEY_DSA_CERT: 214 case KEY_DSA_CERT_V00: 215 case KEY_DSA: 216 name = _PATH_SSH_CLIENT_ID_DSA; 217 break; 218#ifdef OPENSSL_HAS_ECC 219 case KEY_ECDSA_CERT: 220 case KEY_ECDSA: 221 name = _PATH_SSH_CLIENT_ID_ECDSA; 222 break; 223#endif 224 case KEY_RSA_CERT: 225 case KEY_RSA_CERT_V00: 226 case KEY_RSA: 227 name = _PATH_SSH_CLIENT_ID_RSA; 228 break; 229 default: 230 fprintf(stderr, "bad key type\n"); 231 exit(1); 232 break; 233 } 234 } 235 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 236 fprintf(stderr, "%s (%s): ", prompt, identity_file); 237 if (fgets(buf, sizeof(buf), stdin) == NULL) 238 exit(1); 239 buf[strcspn(buf, "\n")] = '\0'; 240 if (strcmp(buf, "") != 0) 241 strlcpy(identity_file, buf, sizeof(identity_file)); 242 have_identity = 1; 243} 244 245static Key * 246load_identity(char *filename) 247{ 248 char *pass; 249 Key *prv; 250 251 prv = key_load_private(filename, "", NULL); 252 if (prv == NULL) { 253 if (identity_passphrase) 254 pass = xstrdup(identity_passphrase); 255 else 256 pass = read_passphrase("Enter passphrase: ", 257 RP_ALLOW_STDIN); 258 prv = key_load_private(filename, pass, NULL); 259 memset(pass, 0, strlen(pass)); 260 xfree(pass); 261 } 262 return prv; 263} 264 265#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 266#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 267#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 268#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 269 270static void 271do_convert_to_ssh2(struct passwd *pw, Key *k) 272{ 273 u_int len; 274 u_char *blob; 275 char comment[61]; 276 277 if (k->type == KEY_RSA1) { 278 fprintf(stderr, "version 1 keys are not supported\n"); 279 exit(1); 280 } 281 if (key_to_blob(k, &blob, &len) <= 0) { 282 fprintf(stderr, "key_to_blob failed\n"); 283 exit(1); 284 } 285 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 286 snprintf(comment, sizeof(comment), 287 "%u-bit %s, converted by %s@%s from OpenSSH", 288 key_size(k), key_type(k), 289 pw->pw_name, hostname); 290 291 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 292 fprintf(stdout, "Comment: \"%s\"\n", comment); 293 dump_base64(stdout, blob, len); 294 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 295 key_free(k); 296 xfree(blob); 297 exit(0); 298} 299 300static void 301do_convert_to_pkcs8(Key *k) 302{ 303 switch (key_type_plain(k->type)) { 304 case KEY_RSA1: 305 case KEY_RSA: 306 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 307 fatal("PEM_write_RSA_PUBKEY failed"); 308 break; 309 case KEY_DSA: 310 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 311 fatal("PEM_write_DSA_PUBKEY failed"); 312 break; 313#ifdef OPENSSL_HAS_ECC 314 case KEY_ECDSA: 315 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 316 fatal("PEM_write_EC_PUBKEY failed"); 317 break; 318#endif 319 default: 320 fatal("%s: unsupported key type %s", __func__, key_type(k)); 321 } 322 exit(0); 323} 324 325static void 326do_convert_to_pem(Key *k) 327{ 328 switch (key_type_plain(k->type)) { 329 case KEY_RSA1: 330 case KEY_RSA: 331 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 332 fatal("PEM_write_RSAPublicKey failed"); 333 break; 334#if notyet /* OpenSSH 0.9.8 lacks this function */ 335 case KEY_DSA: 336 if (!PEM_write_DSAPublicKey(stdout, k->dsa)) 337 fatal("PEM_write_DSAPublicKey failed"); 338 break; 339#endif 340 /* XXX ECDSA? */ 341 default: 342 fatal("%s: unsupported key type %s", __func__, key_type(k)); 343 } 344 exit(0); 345} 346 347static void 348do_convert_to(struct passwd *pw) 349{ 350 Key *k; 351 struct stat st; 352 353 if (!have_identity) 354 ask_filename(pw, "Enter file in which the key is"); 355 if (stat(identity_file, &st) < 0) 356 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 357 if ((k = key_load_public(identity_file, NULL)) == NULL) { 358 if ((k = load_identity(identity_file)) == NULL) { 359 fprintf(stderr, "load failed\n"); 360 exit(1); 361 } 362 } 363 364 switch (convert_format) { 365 case FMT_RFC4716: 366 do_convert_to_ssh2(pw, k); 367 break; 368 case FMT_PKCS8: 369 do_convert_to_pkcs8(k); 370 break; 371 case FMT_PEM: 372 do_convert_to_pem(k); 373 break; 374 default: 375 fatal("%s: unknown key format %d", __func__, convert_format); 376 } 377 exit(0); 378} 379 380static void 381buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 382{ 383 u_int bignum_bits = buffer_get_int(b); 384 u_int bytes = (bignum_bits + 7) / 8; 385 386 if (buffer_len(b) < bytes) 387 fatal("buffer_get_bignum_bits: input buffer too small: " 388 "need %d have %d", bytes, buffer_len(b)); 389 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL) 390 fatal("buffer_get_bignum_bits: BN_bin2bn failed"); 391 buffer_consume(b, bytes); 392} 393 394static Key * 395do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 396{ 397 Buffer b; 398 Key *key = NULL; 399 char *type, *cipher; 400 u_char *sig, data[] = "abcde12345"; 401 int magic, rlen, ktype, i1, i2, i3, i4; 402 u_int slen; 403 u_long e; 404 405 buffer_init(&b); 406 buffer_append(&b, blob, blen); 407 408 magic = buffer_get_int(&b); 409 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 410 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 411 buffer_free(&b); 412 return NULL; 413 } 414 i1 = buffer_get_int(&b); 415 type = buffer_get_string(&b, NULL); 416 cipher = buffer_get_string(&b, NULL); 417 i2 = buffer_get_int(&b); 418 i3 = buffer_get_int(&b); 419 i4 = buffer_get_int(&b); 420 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 421 if (strcmp(cipher, "none") != 0) { 422 error("unsupported cipher %s", cipher); 423 xfree(cipher); 424 buffer_free(&b); 425 xfree(type); 426 return NULL; 427 } 428 xfree(cipher); 429 430 if (strstr(type, "dsa")) { 431 ktype = KEY_DSA; 432 } else if (strstr(type, "rsa")) { 433 ktype = KEY_RSA; 434 } else { 435 buffer_free(&b); 436 xfree(type); 437 return NULL; 438 } 439 key = key_new_private(ktype); 440 xfree(type); 441 442 switch (key->type) { 443 case KEY_DSA: 444 buffer_get_bignum_bits(&b, key->dsa->p); 445 buffer_get_bignum_bits(&b, key->dsa->g); 446 buffer_get_bignum_bits(&b, key->dsa->q); 447 buffer_get_bignum_bits(&b, key->dsa->pub_key); 448 buffer_get_bignum_bits(&b, key->dsa->priv_key); 449 break; 450 case KEY_RSA: 451 e = buffer_get_char(&b); 452 debug("e %lx", e); 453 if (e < 30) { 454 e <<= 8; 455 e += buffer_get_char(&b); 456 debug("e %lx", e); 457 e <<= 8; 458 e += buffer_get_char(&b); 459 debug("e %lx", e); 460 } 461 if (!BN_set_word(key->rsa->e, e)) { 462 buffer_free(&b); 463 key_free(key); 464 return NULL; 465 } 466 buffer_get_bignum_bits(&b, key->rsa->d); 467 buffer_get_bignum_bits(&b, key->rsa->n); 468 buffer_get_bignum_bits(&b, key->rsa->iqmp); 469 buffer_get_bignum_bits(&b, key->rsa->q); 470 buffer_get_bignum_bits(&b, key->rsa->p); 471 rsa_generate_additional_parameters(key->rsa); 472 break; 473 } 474 rlen = buffer_len(&b); 475 if (rlen != 0) 476 error("do_convert_private_ssh2_from_blob: " 477 "remaining bytes in key blob %d", rlen); 478 buffer_free(&b); 479 480 /* try the key */ 481 key_sign(key, &sig, &slen, data, sizeof(data)); 482 key_verify(key, sig, slen, data, sizeof(data)); 483 xfree(sig); 484 return key; 485} 486 487static int 488get_line(FILE *fp, char *line, size_t len) 489{ 490 int c; 491 size_t pos = 0; 492 493 line[0] = '\0'; 494 while ((c = fgetc(fp)) != EOF) { 495 if (pos >= len - 1) { 496 fprintf(stderr, "input line too long.\n"); 497 exit(1); 498 } 499 switch (c) { 500 case '\r': 501 c = fgetc(fp); 502 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { 503 fprintf(stderr, "unget: %s\n", strerror(errno)); 504 exit(1); 505 } 506 return pos; 507 case '\n': 508 return pos; 509 } 510 line[pos++] = c; 511 line[pos] = '\0'; 512 } 513 /* We reached EOF */ 514 return -1; 515} 516 517static void 518do_convert_from_ssh2(struct passwd *pw, Key **k, int *private) 519{ 520 int blen; 521 u_int len; 522 char line[1024]; 523 u_char blob[8096]; 524 char encoded[8096]; 525 int escaped = 0; 526 FILE *fp; 527 528 if ((fp = fopen(identity_file, "r")) == NULL) 529 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 530 encoded[0] = '\0'; 531 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 532 if (line[blen - 1] == '\\') 533 escaped++; 534 if (strncmp(line, "----", 4) == 0 || 535 strstr(line, ": ") != NULL) { 536 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 537 *private = 1; 538 if (strstr(line, " END ") != NULL) { 539 break; 540 } 541 /* fprintf(stderr, "ignore: %s", line); */ 542 continue; 543 } 544 if (escaped) { 545 escaped--; 546 /* fprintf(stderr, "escaped: %s", line); */ 547 continue; 548 } 549 strlcat(encoded, line, sizeof(encoded)); 550 } 551 len = strlen(encoded); 552 if (((len % 4) == 3) && 553 (encoded[len-1] == '=') && 554 (encoded[len-2] == '=') && 555 (encoded[len-3] == '=')) 556 encoded[len-3] = '\0'; 557 blen = uudecode(encoded, blob, sizeof(blob)); 558 if (blen < 0) { 559 fprintf(stderr, "uudecode failed.\n"); 560 exit(1); 561 } 562 *k = *private ? 563 do_convert_private_ssh2_from_blob(blob, blen) : 564 key_from_blob(blob, blen); 565 if (*k == NULL) { 566 fprintf(stderr, "decode blob failed.\n"); 567 exit(1); 568 } 569 fclose(fp); 570} 571 572static void 573do_convert_from_pkcs8(Key **k, int *private) 574{ 575 EVP_PKEY *pubkey; 576 FILE *fp; 577 578 if ((fp = fopen(identity_file, "r")) == NULL) 579 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 580 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 581 fatal("%s: %s is not a recognised public key format", __func__, 582 identity_file); 583 } 584 fclose(fp); 585 switch (EVP_PKEY_type(pubkey->type)) { 586 case EVP_PKEY_RSA: 587 *k = key_new(KEY_UNSPEC); 588 (*k)->type = KEY_RSA; 589 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 590 break; 591 case EVP_PKEY_DSA: 592 *k = key_new(KEY_UNSPEC); 593 (*k)->type = KEY_DSA; 594 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 595 break; 596#ifdef OPENSSL_HAS_ECC 597 case EVP_PKEY_EC: 598 *k = key_new(KEY_UNSPEC); 599 (*k)->type = KEY_ECDSA; 600 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 601 (*k)->ecdsa_nid = key_ecdsa_key_to_nid((*k)->ecdsa); 602 break; 603#endif 604 default: 605 fatal("%s: unsupported pubkey type %d", __func__, 606 EVP_PKEY_type(pubkey->type)); 607 } 608 EVP_PKEY_free(pubkey); 609 return; 610} 611 612static void 613do_convert_from_pem(Key **k, int *private) 614{ 615 FILE *fp; 616 RSA *rsa; 617#ifdef notyet 618 DSA *dsa; 619#endif 620 621 if ((fp = fopen(identity_file, "r")) == NULL) 622 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 623 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 624 *k = key_new(KEY_UNSPEC); 625 (*k)->type = KEY_RSA; 626 (*k)->rsa = rsa; 627 fclose(fp); 628 return; 629 } 630#if notyet /* OpenSSH 0.9.8 lacks this function */ 631 rewind(fp); 632 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 633 *k = key_new(KEY_UNSPEC); 634 (*k)->type = KEY_DSA; 635 (*k)->dsa = dsa; 636 fclose(fp); 637 return; 638 } 639 /* XXX ECDSA */ 640#endif 641 fatal("%s: unrecognised raw private key format", __func__); 642} 643 644static void 645do_convert_from(struct passwd *pw) 646{ 647 Key *k = NULL; 648 int private = 0, ok = 0; 649 struct stat st; 650 651 if (!have_identity) 652 ask_filename(pw, "Enter file in which the key is"); 653 if (stat(identity_file, &st) < 0) 654 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 655 656 switch (convert_format) { 657 case FMT_RFC4716: 658 do_convert_from_ssh2(pw, &k, &private); 659 break; 660 case FMT_PKCS8: 661 do_convert_from_pkcs8(&k, &private); 662 break; 663 case FMT_PEM: 664 do_convert_from_pem(&k, &private); 665 break; 666 default: 667 fatal("%s: unknown key format %d", __func__, convert_format); 668 } 669 670 if (!private) 671 ok = key_write(k, stdout); 672 if (ok) 673 fprintf(stdout, "\n"); 674 else { 675 switch (k->type) { 676 case KEY_DSA: 677 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 678 NULL, 0, NULL, NULL); 679 break; 680#ifdef OPENSSL_HAS_ECC 681 case KEY_ECDSA: 682 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 683 NULL, 0, NULL, NULL); 684 break; 685#endif 686 case KEY_RSA: 687 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 688 NULL, 0, NULL, NULL); 689 break; 690 default: 691 fatal("%s: unsupported key type %s", __func__, 692 key_type(k)); 693 } 694 } 695 696 if (!ok) { 697 fprintf(stderr, "key write failed\n"); 698 exit(1); 699 } 700 key_free(k); 701 exit(0); 702} 703 704static void 705do_print_public(struct passwd *pw) 706{ 707 Key *prv; 708 struct stat st; 709 710 if (!have_identity) 711 ask_filename(pw, "Enter file in which the key is"); 712 if (stat(identity_file, &st) < 0) { 713 perror(identity_file); 714 exit(1); 715 } 716 prv = load_identity(identity_file); 717 if (prv == NULL) { 718 fprintf(stderr, "load failed\n"); 719 exit(1); 720 } 721 if (!key_write(prv, stdout)) 722 fprintf(stderr, "key_write failed"); 723 key_free(prv); 724 fprintf(stdout, "\n"); 725 exit(0); 726} 727 728static void 729do_download(struct passwd *pw) 730{ 731#ifdef ENABLE_PKCS11 732 Key **keys = NULL; 733 int i, nkeys; 734 enum fp_rep rep; 735 enum fp_type fptype; 736 char *fp, *ra; 737 738 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 739 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 740 741 pkcs11_init(0); 742 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 743 if (nkeys <= 0) 744 fatal("cannot read public key from pkcs11"); 745 for (i = 0; i < nkeys; i++) { 746 if (print_fingerprint) { 747 fp = key_fingerprint(keys[i], fptype, rep); 748 ra = key_fingerprint(keys[i], SSH_FP_MD5, 749 SSH_FP_RANDOMART); 750 printf("%u %s %s (PKCS11 key)\n", key_size(keys[i]), 751 fp, key_type(keys[i])); 752 if (log_level >= SYSLOG_LEVEL_VERBOSE) 753 printf("%s\n", ra); 754 xfree(ra); 755 xfree(fp); 756 } else { 757 key_write(keys[i], stdout); 758 fprintf(stdout, "\n"); 759 } 760 key_free(keys[i]); 761 } 762 xfree(keys); 763 pkcs11_terminate(); 764 exit(0); 765#else 766 fatal("no pkcs11 support"); 767#endif /* ENABLE_PKCS11 */ 768} 769 770static void 771do_fingerprint(struct passwd *pw) 772{ 773 FILE *f; 774 Key *public; 775 char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra; 776 int i, skip = 0, num = 0, invalid = 1; 777 enum fp_rep rep; 778 enum fp_type fptype; 779 struct stat st; 780 781 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 782 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 783 784 if (!have_identity) 785 ask_filename(pw, "Enter file in which the key is"); 786 if (stat(identity_file, &st) < 0) { 787 perror(identity_file); 788 exit(1); 789 } 790 public = key_load_public(identity_file, &comment); 791 if (public != NULL) { 792 fp = key_fingerprint(public, fptype, rep); 793 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 794 printf("%u %s %s (%s)\n", key_size(public), fp, comment, 795 key_type(public)); 796 if (log_level >= SYSLOG_LEVEL_VERBOSE) 797 printf("%s\n", ra); 798 key_free(public); 799 xfree(comment); 800 xfree(ra); 801 xfree(fp); 802 exit(0); 803 } 804 if (comment) { 805 xfree(comment); 806 comment = NULL; 807 } 808 809 if ((f = fopen(identity_file, "r")) == NULL) 810 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 811 812 while (fgets(line, sizeof(line), f)) { 813 if ((cp = strchr(line, '\n')) == NULL) { 814 error("line %d too long: %.40s...", 815 num + 1, line); 816 skip = 1; 817 continue; 818 } 819 num++; 820 if (skip) { 821 skip = 0; 822 continue; 823 } 824 *cp = '\0'; 825 826 /* Skip leading whitespace, empty and comment lines. */ 827 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 828 ; 829 if (!*cp || *cp == '\n' || *cp == '#') 830 continue; 831 i = strtol(cp, &ep, 10); 832 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 833 int quoted = 0; 834 comment = cp; 835 for (; *cp && (quoted || (*cp != ' ' && 836 *cp != '\t')); cp++) { 837 if (*cp == '\\' && cp[1] == '"') 838 cp++; /* Skip both */ 839 else if (*cp == '"') 840 quoted = !quoted; 841 } 842 if (!*cp) 843 continue; 844 *cp++ = '\0'; 845 } 846 ep = cp; 847 public = key_new(KEY_RSA1); 848 if (key_read(public, &cp) != 1) { 849 cp = ep; 850 key_free(public); 851 public = key_new(KEY_UNSPEC); 852 if (key_read(public, &cp) != 1) { 853 key_free(public); 854 continue; 855 } 856 } 857 comment = *cp ? cp : comment; 858 fp = key_fingerprint(public, fptype, rep); 859 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 860 printf("%u %s %s (%s)\n", key_size(public), fp, 861 comment ? comment : "no comment", key_type(public)); 862 if (log_level >= SYSLOG_LEVEL_VERBOSE) 863 printf("%s\n", ra); 864 xfree(ra); 865 xfree(fp); 866 key_free(public); 867 invalid = 0; 868 } 869 fclose(f); 870 871 if (invalid) { 872 printf("%s is not a public key file.\n", identity_file); 873 exit(1); 874 } 875 exit(0); 876} 877 878static void 879do_gen_all_hostkeys(struct passwd *pw) 880{ 881 struct { 882 char *key_type; 883 char *key_type_display; 884 char *path; 885 } key_types[] = { 886 { "rsa1", "RSA1", _PATH_HOST_KEY_FILE }, 887 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 888 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 889#ifdef OPENSSL_HAS_ECC 890 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 891#endif 892 { NULL, NULL, NULL } 893 }; 894 895 int first = 0; 896 struct stat st; 897 Key *private, *public; 898 char comment[1024]; 899 int i, type, fd; 900 FILE *f; 901 902 for (i = 0; key_types[i].key_type; i++) { 903 if (stat(key_types[i].path, &st) == 0) 904 continue; 905 if (errno != ENOENT) { 906 printf("Could not stat %s: %s", key_types[i].path, 907 strerror(errno)); 908 first = 0; 909 continue; 910 } 911 912 if (first == 0) { 913 first = 1; 914 printf("%s: generating new host keys: ", __progname); 915 } 916 printf("%s ", key_types[i].key_type_display); 917 fflush(stdout); 918 arc4random_stir(); 919 type = key_type_from_name(key_types[i].key_type); 920 strlcpy(identity_file, key_types[i].path, sizeof(identity_file)); 921 bits = 0; 922 type_bits_valid(type, &bits); 923 private = key_generate(type, bits); 924 if (private == NULL) { 925 fprintf(stderr, "key_generate failed\n"); 926 first = 0; 927 continue; 928 } 929 public = key_from_private(private); 930 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 931 hostname); 932 if (!key_save_private(private, identity_file, "", comment)) { 933 printf("Saving the key failed: %s.\n", identity_file); 934 key_free(private); 935 key_free(public); 936 first = 0; 937 continue; 938 } 939 key_free(private); 940 arc4random_stir(); 941 strlcat(identity_file, ".pub", sizeof(identity_file)); 942 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 943 if (fd == -1) { 944 printf("Could not save your public key in %s\n", 945 identity_file); 946 key_free(public); 947 first = 0; 948 continue; 949 } 950 f = fdopen(fd, "w"); 951 if (f == NULL) { 952 printf("fdopen %s failed\n", identity_file); 953 key_free(public); 954 first = 0; 955 continue; 956 } 957 if (!key_write(public, f)) { 958 fprintf(stderr, "write key failed\n"); 959 key_free(public); 960 first = 0; 961 continue; 962 } 963 fprintf(f, " %s\n", comment); 964 fclose(f); 965 key_free(public); 966 967 } 968 if (first != 0) 969 printf("\n"); 970} 971 972static void 973printhost(FILE *f, const char *name, Key *public, int ca, int hash) 974{ 975 if (print_fingerprint) { 976 enum fp_rep rep; 977 enum fp_type fptype; 978 char *fp, *ra; 979 980 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 981 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 982 fp = key_fingerprint(public, fptype, rep); 983 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 984 printf("%u %s %s (%s)\n", key_size(public), fp, name, 985 key_type(public)); 986 if (log_level >= SYSLOG_LEVEL_VERBOSE) 987 printf("%s\n", ra); 988 xfree(ra); 989 xfree(fp); 990 } else { 991 if (hash && (name = host_hash(name, NULL, 0)) == NULL) 992 fatal("hash_host failed"); 993 fprintf(f, "%s%s%s ", ca ? CA_MARKER : "", ca ? " " : "", name); 994 if (!key_write(public, f)) 995 fatal("key_write failed"); 996 fprintf(f, "\n"); 997 } 998} 999 1000static void 1001do_known_hosts(struct passwd *pw, const char *name) 1002{ 1003 FILE *in, *out = stdout; 1004 Key *pub; 1005 char *cp, *cp2, *kp, *kp2; 1006 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; 1007 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; 1008 int ca; 1009 1010 if (!have_identity) { 1011 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1012 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1013 sizeof(identity_file)) 1014 fatal("Specified known hosts path too long"); 1015 xfree(cp); 1016 have_identity = 1; 1017 } 1018 if ((in = fopen(identity_file, "r")) == NULL) 1019 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1020 1021 /* 1022 * Find hosts goes to stdout, hash and deletions happen in-place 1023 * A corner case is ssh-keygen -HF foo, which should go to stdout 1024 */ 1025 if (!find_host && (hash_hosts || delete_host)) { 1026 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1027 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1028 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1029 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1030 fatal("known_hosts path too long"); 1031 umask(077); 1032 if ((c = mkstemp(tmp)) == -1) 1033 fatal("mkstemp: %s", strerror(errno)); 1034 if ((out = fdopen(c, "w")) == NULL) { 1035 c = errno; 1036 unlink(tmp); 1037 fatal("fdopen: %s", strerror(c)); 1038 } 1039 inplace = 1; 1040 } 1041 1042 while (fgets(line, sizeof(line), in)) { 1043 if ((cp = strchr(line, '\n')) == NULL) { 1044 error("line %d too long: %.40s...", num + 1, line); 1045 skip = 1; 1046 invalid = 1; 1047 continue; 1048 } 1049 num++; 1050 if (skip) { 1051 skip = 0; 1052 continue; 1053 } 1054 *cp = '\0'; 1055 1056 /* Skip leading whitespace, empty and comment lines. */ 1057 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 1058 ; 1059 if (!*cp || *cp == '\n' || *cp == '#') { 1060 if (inplace) 1061 fprintf(out, "%s\n", cp); 1062 continue; 1063 } 1064 /* Check whether this is a CA key */ 1065 if (strncasecmp(cp, CA_MARKER, sizeof(CA_MARKER) - 1) == 0 && 1066 (cp[sizeof(CA_MARKER) - 1] == ' ' || 1067 cp[sizeof(CA_MARKER) - 1] == '\t')) { 1068 ca = 1; 1069 cp += sizeof(CA_MARKER); 1070 } else 1071 ca = 0; 1072 1073 /* Find the end of the host name portion. */ 1074 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) 1075 ; 1076 1077 if (*kp == '\0' || *(kp + 1) == '\0') { 1078 error("line %d missing key: %.40s...", 1079 num, line); 1080 invalid = 1; 1081 continue; 1082 } 1083 *kp++ = '\0'; 1084 kp2 = kp; 1085 1086 pub = key_new(KEY_RSA1); 1087 if (key_read(pub, &kp) != 1) { 1088 kp = kp2; 1089 key_free(pub); 1090 pub = key_new(KEY_UNSPEC); 1091 if (key_read(pub, &kp) != 1) { 1092 error("line %d invalid key: %.40s...", 1093 num, line); 1094 key_free(pub); 1095 invalid = 1; 1096 continue; 1097 } 1098 } 1099 1100 if (*cp == HASH_DELIM) { 1101 if (find_host || delete_host) { 1102 cp2 = host_hash(name, cp, strlen(cp)); 1103 if (cp2 == NULL) { 1104 error("line %d: invalid hashed " 1105 "name: %.64s...", num, line); 1106 invalid = 1; 1107 continue; 1108 } 1109 c = (strcmp(cp2, cp) == 0); 1110 if (find_host && c) { 1111 printf("# Host %s found: " 1112 "line %d type %s%s\n", name, 1113 num, key_type(pub), 1114 ca ? " (CA key)" : ""); 1115 printhost(out, cp, pub, ca, 0); 1116 } 1117 if (delete_host) { 1118 if (!c && !ca) 1119 printhost(out, cp, pub, ca, 0); 1120 else 1121 printf("# Host %s found: " 1122 "line %d type %s\n", name, 1123 num, key_type(pub)); 1124 } 1125 } else if (hash_hosts) 1126 printhost(out, cp, pub, ca, 0); 1127 } else { 1128 if (find_host || delete_host) { 1129 c = (match_hostname(name, cp, 1130 strlen(cp)) == 1); 1131 if (find_host && c) { 1132 printf("# Host %s found: " 1133 "line %d type %s%s\n", name, 1134 num, key_type(pub), 1135 ca ? " (CA key)" : ""); 1136 printhost(out, name, pub, 1137 ca, hash_hosts && !ca); 1138 } 1139 if (delete_host) { 1140 if (!c && !ca) 1141 printhost(out, cp, pub, ca, 0); 1142 else 1143 printf("# Host %s found: " 1144 "line %d type %s\n", name, 1145 num, key_type(pub)); 1146 } 1147 } else if (hash_hosts) { 1148 for (cp2 = strsep(&cp, ","); 1149 cp2 != NULL && *cp2 != '\0'; 1150 cp2 = strsep(&cp, ",")) { 1151 if (ca) { 1152 fprintf(stderr, "Warning: " 1153 "ignoring CA key for host: " 1154 "%.64s\n", cp2); 1155 printhost(out, cp2, pub, ca, 0); 1156 } else if (strcspn(cp2, "*?!") != 1157 strlen(cp2)) { 1158 fprintf(stderr, "Warning: " 1159 "ignoring host name with " 1160 "metacharacters: %.64s\n", 1161 cp2); 1162 printhost(out, cp2, pub, ca, 0); 1163 } else 1164 printhost(out, cp2, pub, ca, 1); 1165 } 1166 has_unhashed = 1; 1167 } 1168 } 1169 key_free(pub); 1170 } 1171 fclose(in); 1172 1173 if (invalid) { 1174 fprintf(stderr, "%s is not a valid known_hosts file.\n", 1175 identity_file); 1176 if (inplace) { 1177 fprintf(stderr, "Not replacing existing known_hosts " 1178 "file because of errors\n"); 1179 fclose(out); 1180 unlink(tmp); 1181 } 1182 exit(1); 1183 } 1184 1185 if (inplace) { 1186 fclose(out); 1187 1188 /* Backup existing file */ 1189 if (unlink(old) == -1 && errno != ENOENT) 1190 fatal("unlink %.100s: %s", old, strerror(errno)); 1191 if (link(identity_file, old) == -1) 1192 fatal("link %.100s to %.100s: %s", identity_file, old, 1193 strerror(errno)); 1194 /* Move new one into place */ 1195 if (rename(tmp, identity_file) == -1) { 1196 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1197 strerror(errno)); 1198 unlink(tmp); 1199 unlink(old); 1200 exit(1); 1201 } 1202 1203 fprintf(stderr, "%s updated.\n", identity_file); 1204 fprintf(stderr, "Original contents retained as %s\n", old); 1205 if (has_unhashed) { 1206 fprintf(stderr, "WARNING: %s contains unhashed " 1207 "entries\n", old); 1208 fprintf(stderr, "Delete this file to ensure privacy " 1209 "of hostnames\n"); 1210 } 1211 } 1212 1213 exit(0); 1214} 1215 1216/* 1217 * Perform changing a passphrase. The argument is the passwd structure 1218 * for the current user. 1219 */ 1220static void 1221do_change_passphrase(struct passwd *pw) 1222{ 1223 char *comment; 1224 char *old_passphrase, *passphrase1, *passphrase2; 1225 struct stat st; 1226 Key *private; 1227 1228 if (!have_identity) 1229 ask_filename(pw, "Enter file in which the key is"); 1230 if (stat(identity_file, &st) < 0) { 1231 perror(identity_file); 1232 exit(1); 1233 } 1234 /* Try to load the file with empty passphrase. */ 1235 private = key_load_private(identity_file, "", &comment); 1236 if (private == NULL) { 1237 if (identity_passphrase) 1238 old_passphrase = xstrdup(identity_passphrase); 1239 else 1240 old_passphrase = 1241 read_passphrase("Enter old passphrase: ", 1242 RP_ALLOW_STDIN); 1243 private = key_load_private(identity_file, old_passphrase, 1244 &comment); 1245 memset(old_passphrase, 0, strlen(old_passphrase)); 1246 xfree(old_passphrase); 1247 if (private == NULL) { 1248 printf("Bad passphrase.\n"); 1249 exit(1); 1250 } 1251 } 1252 printf("Key has comment '%s'\n", comment); 1253 1254 /* Ask the new passphrase (twice). */ 1255 if (identity_new_passphrase) { 1256 passphrase1 = xstrdup(identity_new_passphrase); 1257 passphrase2 = NULL; 1258 } else { 1259 passphrase1 = 1260 read_passphrase("Enter new passphrase (empty for no " 1261 "passphrase): ", RP_ALLOW_STDIN); 1262 passphrase2 = read_passphrase("Enter same passphrase again: ", 1263 RP_ALLOW_STDIN); 1264 1265 /* Verify that they are the same. */ 1266 if (strcmp(passphrase1, passphrase2) != 0) { 1267 memset(passphrase1, 0, strlen(passphrase1)); 1268 memset(passphrase2, 0, strlen(passphrase2)); 1269 xfree(passphrase1); 1270 xfree(passphrase2); 1271 printf("Pass phrases do not match. Try again.\n"); 1272 exit(1); 1273 } 1274 /* Destroy the other copy. */ 1275 memset(passphrase2, 0, strlen(passphrase2)); 1276 xfree(passphrase2); 1277 } 1278 1279 /* Save the file using the new passphrase. */ 1280 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1281 printf("Saving the key failed: %s.\n", identity_file); 1282 memset(passphrase1, 0, strlen(passphrase1)); 1283 xfree(passphrase1); 1284 key_free(private); 1285 xfree(comment); 1286 exit(1); 1287 } 1288 /* Destroy the passphrase and the copy of the key in memory. */ 1289 memset(passphrase1, 0, strlen(passphrase1)); 1290 xfree(passphrase1); 1291 key_free(private); /* Destroys contents */ 1292 xfree(comment); 1293 1294 printf("Your identification has been saved with the new passphrase.\n"); 1295 exit(0); 1296} 1297 1298/* 1299 * Print the SSHFP RR. 1300 */ 1301static int 1302do_print_resource_record(struct passwd *pw, char *fname, char *hname) 1303{ 1304 Key *public; 1305 char *comment = NULL; 1306 struct stat st; 1307 1308 if (fname == NULL) 1309 ask_filename(pw, "Enter file in which the key is"); 1310 if (stat(fname, &st) < 0) { 1311 if (errno == ENOENT) 1312 return 0; 1313 perror(fname); 1314 exit(1); 1315 } 1316 public = key_load_public(fname, &comment); 1317 if (public != NULL) { 1318 export_dns_rr(hname, public, stdout, print_generic); 1319 key_free(public); 1320 xfree(comment); 1321 return 1; 1322 } 1323 if (comment) 1324 xfree(comment); 1325 1326 printf("failed to read v2 public key from %s.\n", fname); 1327 exit(1); 1328} 1329 1330/* 1331 * Change the comment of a private key file. 1332 */ 1333static void 1334do_change_comment(struct passwd *pw) 1335{ 1336 char new_comment[1024], *comment, *passphrase; 1337 Key *private; 1338 Key *public; 1339 struct stat st; 1340 FILE *f; 1341 int fd; 1342 1343 if (!have_identity) 1344 ask_filename(pw, "Enter file in which the key is"); 1345 if (stat(identity_file, &st) < 0) { 1346 perror(identity_file); 1347 exit(1); 1348 } 1349 private = key_load_private(identity_file, "", &comment); 1350 if (private == NULL) { 1351 if (identity_passphrase) 1352 passphrase = xstrdup(identity_passphrase); 1353 else if (identity_new_passphrase) 1354 passphrase = xstrdup(identity_new_passphrase); 1355 else 1356 passphrase = read_passphrase("Enter passphrase: ", 1357 RP_ALLOW_STDIN); 1358 /* Try to load using the passphrase. */ 1359 private = key_load_private(identity_file, passphrase, &comment); 1360 if (private == NULL) { 1361 memset(passphrase, 0, strlen(passphrase)); 1362 xfree(passphrase); 1363 printf("Bad passphrase.\n"); 1364 exit(1); 1365 } 1366 } else { 1367 passphrase = xstrdup(""); 1368 } 1369 if (private->type != KEY_RSA1) { 1370 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 1371 key_free(private); 1372 exit(1); 1373 } 1374 printf("Key now has comment '%s'\n", comment); 1375 1376 if (identity_comment) { 1377 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1378 } else { 1379 printf("Enter new comment: "); 1380 fflush(stdout); 1381 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1382 memset(passphrase, 0, strlen(passphrase)); 1383 key_free(private); 1384 exit(1); 1385 } 1386 new_comment[strcspn(new_comment, "\n")] = '\0'; 1387 } 1388 1389 /* Save the file using the new passphrase. */ 1390 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 1391 printf("Saving the key failed: %s.\n", identity_file); 1392 memset(passphrase, 0, strlen(passphrase)); 1393 xfree(passphrase); 1394 key_free(private); 1395 xfree(comment); 1396 exit(1); 1397 } 1398 memset(passphrase, 0, strlen(passphrase)); 1399 xfree(passphrase); 1400 public = key_from_private(private); 1401 key_free(private); 1402 1403 strlcat(identity_file, ".pub", sizeof(identity_file)); 1404 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1405 if (fd == -1) { 1406 printf("Could not save your public key in %s\n", identity_file); 1407 exit(1); 1408 } 1409 f = fdopen(fd, "w"); 1410 if (f == NULL) { 1411 printf("fdopen %s failed\n", identity_file); 1412 exit(1); 1413 } 1414 if (!key_write(public, f)) 1415 fprintf(stderr, "write key failed\n"); 1416 key_free(public); 1417 fprintf(f, " %s\n", new_comment); 1418 fclose(f); 1419 1420 xfree(comment); 1421 1422 printf("The comment in your key file has been changed.\n"); 1423 exit(0); 1424} 1425 1426static const char * 1427fmt_validity(u_int64_t valid_from, u_int64_t valid_to) 1428{ 1429 char from[32], to[32]; 1430 static char ret[64]; 1431 time_t tt; 1432 struct tm *tm; 1433 1434 *from = *to = '\0'; 1435 if (valid_from == 0 && valid_to == 0xffffffffffffffffULL) 1436 return "forever"; 1437 1438 if (valid_from != 0) { 1439 /* XXX revisit INT_MAX in 2038 :) */ 1440 tt = valid_from > INT_MAX ? INT_MAX : valid_from; 1441 tm = localtime(&tt); 1442 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); 1443 } 1444 if (valid_to != 0xffffffffffffffffULL) { 1445 /* XXX revisit INT_MAX in 2038 :) */ 1446 tt = valid_to > INT_MAX ? INT_MAX : valid_to; 1447 tm = localtime(&tt); 1448 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); 1449 } 1450 1451 if (valid_from == 0) { 1452 snprintf(ret, sizeof(ret), "before %s", to); 1453 return ret; 1454 } 1455 if (valid_to == 0xffffffffffffffffULL) { 1456 snprintf(ret, sizeof(ret), "after %s", from); 1457 return ret; 1458 } 1459 1460 snprintf(ret, sizeof(ret), "from %s to %s", from, to); 1461 return ret; 1462} 1463 1464static void 1465add_flag_option(Buffer *c, const char *name) 1466{ 1467 debug3("%s: %s", __func__, name); 1468 buffer_put_cstring(c, name); 1469 buffer_put_string(c, NULL, 0); 1470} 1471 1472static void 1473add_string_option(Buffer *c, const char *name, const char *value) 1474{ 1475 Buffer b; 1476 1477 debug3("%s: %s=%s", __func__, name, value); 1478 buffer_init(&b); 1479 buffer_put_cstring(&b, value); 1480 1481 buffer_put_cstring(c, name); 1482 buffer_put_string(c, buffer_ptr(&b), buffer_len(&b)); 1483 1484 buffer_free(&b); 1485} 1486 1487#define OPTIONS_CRITICAL 1 1488#define OPTIONS_EXTENSIONS 2 1489static void 1490prepare_options_buf(Buffer *c, int which) 1491{ 1492 buffer_clear(c); 1493 if ((which & OPTIONS_CRITICAL) != 0 && 1494 certflags_command != NULL) 1495 add_string_option(c, "force-command", certflags_command); 1496 if ((which & OPTIONS_EXTENSIONS) != 0 && 1497 (certflags_flags & CERTOPT_X_FWD) != 0) 1498 add_flag_option(c, "permit-X11-forwarding"); 1499 if ((which & OPTIONS_EXTENSIONS) != 0 && 1500 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1501 add_flag_option(c, "permit-agent-forwarding"); 1502 if ((which & OPTIONS_EXTENSIONS) != 0 && 1503 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1504 add_flag_option(c, "permit-port-forwarding"); 1505 if ((which & OPTIONS_EXTENSIONS) != 0 && 1506 (certflags_flags & CERTOPT_PTY) != 0) 1507 add_flag_option(c, "permit-pty"); 1508 if ((which & OPTIONS_EXTENSIONS) != 0 && 1509 (certflags_flags & CERTOPT_USER_RC) != 0) 1510 add_flag_option(c, "permit-user-rc"); 1511 if ((which & OPTIONS_CRITICAL) != 0 && 1512 certflags_src_addr != NULL) 1513 add_string_option(c, "source-address", certflags_src_addr); 1514} 1515 1516static Key * 1517load_pkcs11_key(char *path) 1518{ 1519#ifdef ENABLE_PKCS11 1520 Key **keys = NULL, *public, *private = NULL; 1521 int i, nkeys; 1522 1523 if ((public = key_load_public(path, NULL)) == NULL) 1524 fatal("Couldn't load CA public key \"%s\"", path); 1525 1526 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1527 debug3("%s: %d keys", __func__, nkeys); 1528 if (nkeys <= 0) 1529 fatal("cannot read public key from pkcs11"); 1530 for (i = 0; i < nkeys; i++) { 1531 if (key_equal_public(public, keys[i])) { 1532 private = keys[i]; 1533 continue; 1534 } 1535 key_free(keys[i]); 1536 } 1537 xfree(keys); 1538 key_free(public); 1539 return private; 1540#else 1541 fatal("no pkcs11 support"); 1542#endif /* ENABLE_PKCS11 */ 1543} 1544 1545static void 1546do_ca_sign(struct passwd *pw, int argc, char **argv) 1547{ 1548 int i, fd; 1549 u_int n; 1550 Key *ca, *public; 1551 char *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1552 FILE *f; 1553 int v00 = 0; /* legacy keys */ 1554 1555 if (key_type_name != NULL) { 1556 switch (key_type_from_name(key_type_name)) { 1557 case KEY_RSA_CERT_V00: 1558 case KEY_DSA_CERT_V00: 1559 v00 = 1; 1560 break; 1561 case KEY_UNSPEC: 1562 if (strcasecmp(key_type_name, "v00") == 0) { 1563 v00 = 1; 1564 break; 1565 } else if (strcasecmp(key_type_name, "v01") == 0) 1566 break; 1567 /* FALLTHROUGH */ 1568 default: 1569 fprintf(stderr, "unknown key type %s\n", key_type_name); 1570 exit(1); 1571 } 1572 } 1573 1574#ifdef ENABLE_PKCS11 1575 pkcs11_init(1); 1576#endif 1577 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1578 if (pkcs11provider != NULL) { 1579 if ((ca = load_pkcs11_key(tmp)) == NULL) 1580 fatal("No PKCS#11 key matching %s found", ca_key_path); 1581 } else if ((ca = load_identity(tmp)) == NULL) 1582 fatal("Couldn't load CA key \"%s\"", tmp); 1583 xfree(tmp); 1584 1585 for (i = 0; i < argc; i++) { 1586 /* Split list of principals */ 1587 n = 0; 1588 if (cert_principals != NULL) { 1589 otmp = tmp = xstrdup(cert_principals); 1590 plist = NULL; 1591 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1592 plist = xrealloc(plist, n + 1, sizeof(*plist)); 1593 if (*(plist[n] = xstrdup(cp)) == '\0') 1594 fatal("Empty principal name"); 1595 } 1596 xfree(otmp); 1597 } 1598 1599 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1600 if ((public = key_load_public(tmp, &comment)) == NULL) 1601 fatal("%s: unable to open \"%s\"", __func__, tmp); 1602 if (public->type != KEY_RSA && public->type != KEY_DSA && 1603 public->type != KEY_ECDSA) 1604 fatal("%s: key \"%s\" type %s cannot be certified", 1605 __func__, tmp, key_type(public)); 1606 1607 /* Prepare certificate to sign */ 1608 if (key_to_certified(public, v00) != 0) 1609 fatal("Could not upgrade key %s to certificate", tmp); 1610 public->cert->type = cert_key_type; 1611 public->cert->serial = (u_int64_t)cert_serial; 1612 public->cert->key_id = xstrdup(cert_key_id); 1613 public->cert->nprincipals = n; 1614 public->cert->principals = plist; 1615 public->cert->valid_after = cert_valid_from; 1616 public->cert->valid_before = cert_valid_to; 1617 if (v00) { 1618 prepare_options_buf(&public->cert->critical, 1619 OPTIONS_CRITICAL|OPTIONS_EXTENSIONS); 1620 } else { 1621 prepare_options_buf(&public->cert->critical, 1622 OPTIONS_CRITICAL); 1623 prepare_options_buf(&public->cert->extensions, 1624 OPTIONS_EXTENSIONS); 1625 } 1626 public->cert->signature_key = key_from_private(ca); 1627 1628 if (key_certify(public, ca) != 0) 1629 fatal("Couldn't not certify key %s", tmp); 1630 1631 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1632 *cp = '\0'; 1633 xasprintf(&out, "%s-cert.pub", tmp); 1634 xfree(tmp); 1635 1636 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1637 fatal("Could not open \"%s\" for writing: %s", out, 1638 strerror(errno)); 1639 if ((f = fdopen(fd, "w")) == NULL) 1640 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1641 if (!key_write(public, f)) 1642 fatal("Could not write certified key to %s", out); 1643 fprintf(f, " %s\n", comment); 1644 fclose(f); 1645 1646 if (!quiet) { 1647 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1648 "valid %s", key_cert_type(public), 1649 out, public->cert->key_id, 1650 (unsigned long long)public->cert->serial, 1651 cert_principals != NULL ? " for " : "", 1652 cert_principals != NULL ? cert_principals : "", 1653 fmt_validity(cert_valid_from, cert_valid_to)); 1654 } 1655 1656 key_free(public); 1657 xfree(out); 1658 } 1659#ifdef ENABLE_PKCS11 1660 pkcs11_terminate(); 1661#endif 1662 exit(0); 1663} 1664 1665static u_int64_t 1666parse_relative_time(const char *s, time_t now) 1667{ 1668 int64_t mul, secs; 1669 1670 mul = *s == '-' ? -1 : 1; 1671 1672 if ((secs = convtime(s + 1)) == -1) 1673 fatal("Invalid relative certificate time %s", s); 1674 if (mul == -1 && secs > now) 1675 fatal("Certificate time %s cannot be represented", s); 1676 return now + (u_int64_t)(secs * mul); 1677} 1678 1679static u_int64_t 1680parse_absolute_time(const char *s) 1681{ 1682 struct tm tm; 1683 time_t tt; 1684 char buf[32], *fmt; 1685 1686 /* 1687 * POSIX strptime says "The application shall ensure that there 1688 * is white-space or other non-alphanumeric characters between 1689 * any two conversion specifications" so arrange things this way. 1690 */ 1691 switch (strlen(s)) { 1692 case 8: 1693 fmt = "%Y-%m-%d"; 1694 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1695 break; 1696 case 14: 1697 fmt = "%Y-%m-%dT%H:%M:%S"; 1698 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1699 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1700 break; 1701 default: 1702 fatal("Invalid certificate time format %s", s); 1703 } 1704 1705 bzero(&tm, sizeof(tm)); 1706 if (strptime(buf, fmt, &tm) == NULL) 1707 fatal("Invalid certificate time %s", s); 1708 if ((tt = mktime(&tm)) < 0) 1709 fatal("Certificate time %s cannot be represented", s); 1710 return (u_int64_t)tt; 1711} 1712 1713static void 1714parse_cert_times(char *timespec) 1715{ 1716 char *from, *to; 1717 time_t now = time(NULL); 1718 int64_t secs; 1719 1720 /* +timespec relative to now */ 1721 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1722 if ((secs = convtime(timespec + 1)) == -1) 1723 fatal("Invalid relative certificate life %s", timespec); 1724 cert_valid_to = now + secs; 1725 /* 1726 * Backdate certificate one minute to avoid problems on hosts 1727 * with poorly-synchronised clocks. 1728 */ 1729 cert_valid_from = ((now - 59)/ 60) * 60; 1730 return; 1731 } 1732 1733 /* 1734 * from:to, where 1735 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1736 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1737 */ 1738 from = xstrdup(timespec); 1739 to = strchr(from, ':'); 1740 if (to == NULL || from == to || *(to + 1) == '\0') 1741 fatal("Invalid certificate life specification %s", timespec); 1742 *to++ = '\0'; 1743 1744 if (*from == '-' || *from == '+') 1745 cert_valid_from = parse_relative_time(from, now); 1746 else 1747 cert_valid_from = parse_absolute_time(from); 1748 1749 if (*to == '-' || *to == '+') 1750 cert_valid_to = parse_relative_time(to, cert_valid_from); 1751 else 1752 cert_valid_to = parse_absolute_time(to); 1753 1754 if (cert_valid_to <= cert_valid_from) 1755 fatal("Empty certificate validity interval"); 1756 xfree(from); 1757} 1758 1759static void 1760add_cert_option(char *opt) 1761{ 1762 char *val; 1763 1764 if (strcasecmp(opt, "clear") == 0) 1765 certflags_flags = 0; 1766 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1767 certflags_flags &= ~CERTOPT_X_FWD; 1768 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1769 certflags_flags |= CERTOPT_X_FWD; 1770 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1771 certflags_flags &= ~CERTOPT_AGENT_FWD; 1772 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1773 certflags_flags |= CERTOPT_AGENT_FWD; 1774 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1775 certflags_flags &= ~CERTOPT_PORT_FWD; 1776 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1777 certflags_flags |= CERTOPT_PORT_FWD; 1778 else if (strcasecmp(opt, "no-pty") == 0) 1779 certflags_flags &= ~CERTOPT_PTY; 1780 else if (strcasecmp(opt, "permit-pty") == 0) 1781 certflags_flags |= CERTOPT_PTY; 1782 else if (strcasecmp(opt, "no-user-rc") == 0) 1783 certflags_flags &= ~CERTOPT_USER_RC; 1784 else if (strcasecmp(opt, "permit-user-rc") == 0) 1785 certflags_flags |= CERTOPT_USER_RC; 1786 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1787 val = opt + 14; 1788 if (*val == '\0') 1789 fatal("Empty force-command option"); 1790 if (certflags_command != NULL) 1791 fatal("force-command already specified"); 1792 certflags_command = xstrdup(val); 1793 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1794 val = opt + 15; 1795 if (*val == '\0') 1796 fatal("Empty source-address option"); 1797 if (certflags_src_addr != NULL) 1798 fatal("source-address already specified"); 1799 if (addr_match_cidr_list(NULL, val) != 0) 1800 fatal("Invalid source-address list"); 1801 certflags_src_addr = xstrdup(val); 1802 } else 1803 fatal("Unsupported certificate option \"%s\"", opt); 1804} 1805 1806static void 1807show_options(const Buffer *optbuf, int v00, int in_critical) 1808{ 1809 u_char *name, *data; 1810 u_int dlen; 1811 Buffer options, option; 1812 1813 buffer_init(&options); 1814 buffer_append(&options, buffer_ptr(optbuf), buffer_len(optbuf)); 1815 1816 buffer_init(&option); 1817 while (buffer_len(&options) != 0) { 1818 name = buffer_get_string(&options, NULL); 1819 data = buffer_get_string_ptr(&options, &dlen); 1820 buffer_append(&option, data, dlen); 1821 printf(" %s", name); 1822 if ((v00 || !in_critical) && 1823 (strcmp(name, "permit-X11-forwarding") == 0 || 1824 strcmp(name, "permit-agent-forwarding") == 0 || 1825 strcmp(name, "permit-port-forwarding") == 0 || 1826 strcmp(name, "permit-pty") == 0 || 1827 strcmp(name, "permit-user-rc") == 0)) 1828 printf("\n"); 1829 else if ((v00 || in_critical) && 1830 (strcmp(name, "force-command") == 0 || 1831 strcmp(name, "source-address") == 0)) { 1832 data = buffer_get_string(&option, NULL); 1833 printf(" %s\n", data); 1834 xfree(data); 1835 } else { 1836 printf(" UNKNOWN OPTION (len %u)\n", 1837 buffer_len(&option)); 1838 buffer_clear(&option); 1839 } 1840 xfree(name); 1841 if (buffer_len(&option) != 0) 1842 fatal("Option corrupt: extra data at end"); 1843 } 1844 buffer_free(&option); 1845 buffer_free(&options); 1846} 1847 1848static void 1849do_show_cert(struct passwd *pw) 1850{ 1851 Key *key; 1852 struct stat st; 1853 char *key_fp, *ca_fp; 1854 u_int i, v00; 1855 1856 if (!have_identity) 1857 ask_filename(pw, "Enter file in which the key is"); 1858 if (stat(identity_file, &st) < 0) 1859 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1860 if ((key = key_load_public(identity_file, NULL)) == NULL) 1861 fatal("%s is not a public key", identity_file); 1862 if (!key_is_cert(key)) 1863 fatal("%s is not a certificate", identity_file); 1864 v00 = key->type == KEY_RSA_CERT_V00 || key->type == KEY_DSA_CERT_V00; 1865 1866 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); 1867 ca_fp = key_fingerprint(key->cert->signature_key, 1868 SSH_FP_MD5, SSH_FP_HEX); 1869 1870 printf("%s:\n", identity_file); 1871 printf(" Type: %s %s certificate\n", key_ssh_name(key), 1872 key_cert_type(key)); 1873 printf(" Public key: %s %s\n", key_type(key), key_fp); 1874 printf(" Signing CA: %s %s\n", 1875 key_type(key->cert->signature_key), ca_fp); 1876 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1877 if (!v00) { 1878 printf(" Serial: %llu\n", 1879 (unsigned long long)key->cert->serial); 1880 } 1881 printf(" Valid: %s\n", 1882 fmt_validity(key->cert->valid_after, key->cert->valid_before)); 1883 printf(" Principals: "); 1884 if (key->cert->nprincipals == 0) 1885 printf("(none)\n"); 1886 else { 1887 for (i = 0; i < key->cert->nprincipals; i++) 1888 printf("\n %s", 1889 key->cert->principals[i]); 1890 printf("\n"); 1891 } 1892 printf(" Critical Options: "); 1893 if (buffer_len(&key->cert->critical) == 0) 1894 printf("(none)\n"); 1895 else { 1896 printf("\n"); 1897 show_options(&key->cert->critical, v00, 1); 1898 } 1899 if (!v00) { 1900 printf(" Extensions: "); 1901 if (buffer_len(&key->cert->extensions) == 0) 1902 printf("(none)\n"); 1903 else { 1904 printf("\n"); 1905 show_options(&key->cert->extensions, v00, 0); 1906 } 1907 } 1908 exit(0); 1909} 1910 1911static void 1912load_krl(const char *path, struct ssh_krl **krlp) 1913{ 1914 Buffer krlbuf; 1915 int fd; 1916 1917 buffer_init(&krlbuf); 1918 if ((fd = open(path, O_RDONLY)) == -1) 1919 fatal("open %s: %s", path, strerror(errno)); 1920 if (!key_load_file(fd, path, &krlbuf)) 1921 fatal("Unable to load KRL"); 1922 close(fd); 1923 /* XXX check sigs */ 1924 if (ssh_krl_from_blob(&krlbuf, krlp, NULL, 0) != 0 || 1925 *krlp == NULL) 1926 fatal("Invalid KRL file"); 1927 buffer_free(&krlbuf); 1928} 1929 1930static void 1931update_krl_from_file(struct passwd *pw, const char *file, const Key *ca, 1932 struct ssh_krl *krl) 1933{ 1934 Key *key = NULL; 1935 u_long lnum = 0; 1936 char *path, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES]; 1937 unsigned long long serial, serial2; 1938 int i, was_explicit_key, was_sha1, r; 1939 FILE *krl_spec; 1940 1941 path = tilde_expand_filename(file, pw->pw_uid); 1942 if (strcmp(path, "-") == 0) { 1943 krl_spec = stdin; 1944 free(path); 1945 path = xstrdup("(standard input)"); 1946 } else if ((krl_spec = fopen(path, "r")) == NULL) 1947 fatal("fopen %s: %s", path, strerror(errno)); 1948 1949 if (!quiet) 1950 printf("Revoking from %s\n", path); 1951 while (read_keyfile_line(krl_spec, path, line, sizeof(line), 1952 &lnum) == 0) { 1953 was_explicit_key = was_sha1 = 0; 1954 cp = line + strspn(line, " \t"); 1955 /* Trim trailing space, comments and strip \n */ 1956 for (i = 0, r = -1; cp[i] != '\0'; i++) { 1957 if (cp[i] == '#' || cp[i] == '\n') { 1958 cp[i] = '\0'; 1959 break; 1960 } 1961 if (cp[i] == ' ' || cp[i] == '\t') { 1962 /* Remember the start of a span of whitespace */ 1963 if (r == -1) 1964 r = i; 1965 } else 1966 r = -1; 1967 } 1968 if (r != -1) 1969 cp[r] = '\0'; 1970 if (*cp == '\0') 1971 continue; 1972 if (strncasecmp(cp, "serial:", 7) == 0) { 1973 if (ca == NULL) { 1974 fatal("revoking certificated by serial number " 1975 "requires specification of a CA key"); 1976 } 1977 cp += 7; 1978 cp = cp + strspn(cp, " \t"); 1979 errno = 0; 1980 serial = strtoull(cp, &ep, 0); 1981 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 1982 fatal("%s:%lu: invalid serial \"%s\"", 1983 path, lnum, cp); 1984 if (errno == ERANGE && serial == ULLONG_MAX) 1985 fatal("%s:%lu: serial out of range", 1986 path, lnum); 1987 serial2 = serial; 1988 if (*ep == '-') { 1989 cp = ep + 1; 1990 errno = 0; 1991 serial2 = strtoull(cp, &ep, 0); 1992 if (*cp == '\0' || *ep != '\0') 1993 fatal("%s:%lu: invalid serial \"%s\"", 1994 path, lnum, cp); 1995 if (errno == ERANGE && serial2 == ULLONG_MAX) 1996 fatal("%s:%lu: serial out of range", 1997 path, lnum); 1998 if (serial2 <= serial) 1999 fatal("%s:%lu: invalid serial range " 2000 "%llu:%llu", path, lnum, 2001 (unsigned long long)serial, 2002 (unsigned long long)serial2); 2003 } 2004 if (ssh_krl_revoke_cert_by_serial_range(krl, 2005 ca, serial, serial2) != 0) { 2006 fatal("%s: revoke serial failed", 2007 __func__); 2008 } 2009 } else if (strncasecmp(cp, "id:", 3) == 0) { 2010 if (ca == NULL) { 2011 fatal("revoking certificated by key ID " 2012 "requires specification of a CA key"); 2013 } 2014 cp += 3; 2015 cp = cp + strspn(cp, " \t"); 2016 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2017 fatal("%s: revoke key ID failed", __func__); 2018 } else { 2019 if (strncasecmp(cp, "key:", 4) == 0) { 2020 cp += 4; 2021 cp = cp + strspn(cp, " \t"); 2022 was_explicit_key = 1; 2023 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2024 cp += 5; 2025 cp = cp + strspn(cp, " \t"); 2026 was_sha1 = 1; 2027 } else { 2028 /* 2029 * Just try to process the line as a key. 2030 * Parsing will fail if it isn't. 2031 */ 2032 } 2033 if ((key = key_new(KEY_UNSPEC)) == NULL) 2034 fatal("key_new"); 2035 if (key_read(key, &cp) != 1) 2036 fatal("%s:%lu: invalid key", path, lnum); 2037 if (was_explicit_key) 2038 r = ssh_krl_revoke_key_explicit(krl, key); 2039 else if (was_sha1) 2040 r = ssh_krl_revoke_key_sha1(krl, key); 2041 else 2042 r = ssh_krl_revoke_key(krl, key); 2043 if (r != 0) 2044 fatal("%s: revoke key failed", __func__); 2045 key_free(key); 2046 } 2047 } 2048 if (strcmp(path, "-") != 0) 2049 fclose(krl_spec); 2050} 2051 2052static void 2053do_gen_krl(struct passwd *pw, int updating, int argc, char **argv) 2054{ 2055 struct ssh_krl *krl; 2056 struct stat sb; 2057 Key *ca = NULL; 2058 int fd, i; 2059 char *tmp; 2060 Buffer kbuf; 2061 2062 if (*identity_file == '\0') 2063 fatal("KRL generation requires an output file"); 2064 if (stat(identity_file, &sb) == -1) { 2065 if (errno != ENOENT) 2066 fatal("Cannot access KRL \"%s\": %s", 2067 identity_file, strerror(errno)); 2068 if (updating) 2069 fatal("KRL \"%s\" does not exist", identity_file); 2070 } 2071 if (ca_key_path != NULL) { 2072 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2073 if ((ca = key_load_public(tmp, NULL)) == NULL) 2074 fatal("Cannot load CA public key %s", tmp); 2075 xfree(tmp); 2076 } 2077 2078 if (updating) 2079 load_krl(identity_file, &krl); 2080 else if ((krl = ssh_krl_init()) == NULL) 2081 fatal("couldn't create KRL"); 2082 2083 if (cert_serial != 0) 2084 ssh_krl_set_version(krl, cert_serial); 2085 if (identity_comment != NULL) 2086 ssh_krl_set_comment(krl, identity_comment); 2087 2088 for (i = 0; i < argc; i++) 2089 update_krl_from_file(pw, argv[i], ca, krl); 2090 2091 buffer_init(&kbuf); 2092 if (ssh_krl_to_blob(krl, &kbuf, NULL, 0) != 0) 2093 fatal("Couldn't generate KRL"); 2094 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2095 fatal("open %s: %s", identity_file, strerror(errno)); 2096 if (atomicio(vwrite, fd, buffer_ptr(&kbuf), buffer_len(&kbuf)) != 2097 buffer_len(&kbuf)) 2098 fatal("write %s: %s", identity_file, strerror(errno)); 2099 close(fd); 2100 buffer_free(&kbuf); 2101 ssh_krl_free(krl); 2102} 2103 2104static void 2105do_check_krl(struct passwd *pw, int argc, char **argv) 2106{ 2107 int i, r, ret = 0; 2108 char *comment; 2109 struct ssh_krl *krl; 2110 Key *k; 2111 2112 if (*identity_file == '\0') 2113 fatal("KRL checking requires an input file"); 2114 load_krl(identity_file, &krl); 2115 for (i = 0; i < argc; i++) { 2116 if ((k = key_load_public(argv[i], &comment)) == NULL) 2117 fatal("Cannot load public key %s", argv[i]); 2118 r = ssh_krl_check_key(krl, k); 2119 printf("%s%s%s%s: %s\n", argv[i], 2120 *comment ? " (" : "", comment, *comment ? ")" : "", 2121 r == 0 ? "ok" : "REVOKED"); 2122 if (r != 0) 2123 ret = 1; 2124 key_free(k); 2125 free(comment); 2126 } 2127 ssh_krl_free(krl); 2128 exit(ret); 2129} 2130 2131static void 2132usage(void) 2133{ 2134 fprintf(stderr, "usage: %s [options]\n", __progname); 2135 fprintf(stderr, "Options:\n"); 2136 fprintf(stderr, " -A Generate non-existent host keys for all key types.\n"); 2137 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); 2138 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 2139 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 2140 fprintf(stderr, " -C comment Provide new comment.\n"); 2141 fprintf(stderr, " -c Change comment in private and public key files.\n"); 2142#ifdef ENABLE_PKCS11 2143 fprintf(stderr, " -D pkcs11 Download public key from pkcs11 token.\n"); 2144#endif 2145 fprintf(stderr, " -e Export OpenSSH to foreign format key file.\n"); 2146 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); 2147 fprintf(stderr, " -f filename Filename of the key file.\n"); 2148 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); 2149 fprintf(stderr, " -g Use generic DNS resource record format.\n"); 2150 fprintf(stderr, " -H Hash names in known_hosts file.\n"); 2151 fprintf(stderr, " -h Generate host certificate instead of a user certificate.\n"); 2152 fprintf(stderr, " -I key_id Key identifier to include in certificate.\n"); 2153 fprintf(stderr, " -i Import foreign format to OpenSSH key file.\n"); 2154 fprintf(stderr, " -J number Screen this number of moduli lines.\n"); 2155 fprintf(stderr, " -j number Start screening moduli at specified line.\n"); 2156 fprintf(stderr, " -K checkpt Write checkpoints to this file.\n"); 2157 fprintf(stderr, " -k Generate a KRL file.\n"); 2158 fprintf(stderr, " -L Print the contents of a certificate.\n"); 2159 fprintf(stderr, " -l Show fingerprint of key file.\n"); 2160 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); 2161 fprintf(stderr, " -m key_fmt Conversion format for -e/-i (PEM|PKCS8|RFC4716).\n"); 2162 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 2163 fprintf(stderr, " -n name,... User/host principal names to include in certificate\n"); 2164 fprintf(stderr, " -O option Specify a certificate option.\n"); 2165 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 2166 fprintf(stderr, " -p Change passphrase of private key file.\n"); 2167 fprintf(stderr, " -Q Test whether key(s) are revoked in KRL.\n"); 2168 fprintf(stderr, " -q Quiet.\n"); 2169 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); 2170 fprintf(stderr, " -r hostname Print DNS resource record.\n"); 2171 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); 2172 fprintf(stderr, " -s ca_key Certify keys with CA key.\n"); 2173 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); 2174 fprintf(stderr, " -t type Specify type of key to create.\n"); 2175 fprintf(stderr, " -u Update KRL rather than creating a new one.\n"); 2176 fprintf(stderr, " -V from:to Specify certificate validity interval.\n"); 2177 fprintf(stderr, " -v Verbose.\n"); 2178 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); 2179 fprintf(stderr, " -y Read private key file and print public key.\n"); 2180 fprintf(stderr, " -z serial Specify a serial number.\n"); 2181 2182 exit(1); 2183} 2184 2185/* 2186 * Main program for key management. 2187 */ 2188int 2189main(int argc, char **argv) 2190{ 2191 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 2192 char *checkpoint = NULL; 2193 char out_file[MAXPATHLEN], *ep, *rr_hostname = NULL; 2194 Key *private, *public; 2195 struct passwd *pw; 2196 struct stat st; 2197 int opt, type, fd; 2198 u_int32_t memory = 0, generator_wanted = 0, trials = 100; 2199 int do_gen_candidates = 0, do_screen_candidates = 0; 2200 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 2201 unsigned long start_lineno = 0, lines_to_process = 0; 2202 BIGNUM *start = NULL; 2203 FILE *f; 2204 const char *errstr; 2205 2206 extern int optind; 2207 extern char *optarg; 2208 2209 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 2210 sanitise_stdfd(); 2211 2212 __progname = ssh_get_progname(argv[0]); 2213 2214 OpenSSL_add_all_algorithms(); 2215 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 2216 2217 seed_rng(); 2218 2219 /* we need this for the home * directory. */ 2220 pw = getpwuid(getuid()); 2221 if (!pw) { 2222 printf("You don't exist, go away!\n"); 2223 exit(1); 2224 } 2225 if (gethostname(hostname, sizeof(hostname)) < 0) { 2226 perror("gethostname"); 2227 exit(1); 2228 } 2229 2230 while ((opt = getopt(argc, argv, "ABHLQXceghiklpquvxy" 2231 "C:D:F:G:I:J:K:M:N:O:P:R:S:T:V:W:a:b:f:g:j:m:n:r:s:t:z:")) != -1) { 2232 switch (opt) { 2233 case 'A': 2234 gen_all_hostkeys = 1; 2235 break; 2236 case 'b': 2237 bits = (u_int32_t)strtonum(optarg, 256, 32768, &errstr); 2238 if (errstr) 2239 fatal("Bits has bad value %s (%s)", 2240 optarg, errstr); 2241 break; 2242 case 'F': 2243 find_host = 1; 2244 rr_hostname = optarg; 2245 break; 2246 case 'H': 2247 hash_hosts = 1; 2248 break; 2249 case 'I': 2250 cert_key_id = optarg; 2251 break; 2252 case 'J': 2253 lines_to_process = strtoul(optarg, NULL, 10); 2254 break; 2255 case 'j': 2256 start_lineno = strtoul(optarg, NULL, 10); 2257 break; 2258 case 'R': 2259 delete_host = 1; 2260 rr_hostname = optarg; 2261 break; 2262 case 'L': 2263 show_cert = 1; 2264 break; 2265 case 'l': 2266 print_fingerprint = 1; 2267 break; 2268 case 'B': 2269 print_bubblebabble = 1; 2270 break; 2271 case 'm': 2272 if (strcasecmp(optarg, "RFC4716") == 0 || 2273 strcasecmp(optarg, "ssh2") == 0) { 2274 convert_format = FMT_RFC4716; 2275 break; 2276 } 2277 if (strcasecmp(optarg, "PKCS8") == 0) { 2278 convert_format = FMT_PKCS8; 2279 break; 2280 } 2281 if (strcasecmp(optarg, "PEM") == 0) { 2282 convert_format = FMT_PEM; 2283 break; 2284 } 2285 fatal("Unsupported conversion format \"%s\"", optarg); 2286 case 'n': 2287 cert_principals = optarg; 2288 break; 2289 case 'p': 2290 change_passphrase = 1; 2291 break; 2292 case 'c': 2293 change_comment = 1; 2294 break; 2295 case 'f': 2296 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= 2297 sizeof(identity_file)) 2298 fatal("Identity filename too long"); 2299 have_identity = 1; 2300 break; 2301 case 'g': 2302 print_generic = 1; 2303 break; 2304 case 'P': 2305 identity_passphrase = optarg; 2306 break; 2307 case 'N': 2308 identity_new_passphrase = optarg; 2309 break; 2310 case 'Q': 2311 check_krl = 1; 2312 break; 2313 case 'O': 2314 add_cert_option(optarg); 2315 break; 2316 case 'C': 2317 identity_comment = optarg; 2318 break; 2319 case 'q': 2320 quiet = 1; 2321 break; 2322 case 'e': 2323 case 'x': 2324 /* export key */ 2325 convert_to = 1; 2326 break; 2327 case 'h': 2328 cert_key_type = SSH2_CERT_TYPE_HOST; 2329 certflags_flags = 0; 2330 break; 2331 case 'k': 2332 gen_krl = 1; 2333 break; 2334 case 'i': 2335 case 'X': 2336 /* import key */ 2337 convert_from = 1; 2338 break; 2339 case 'y': 2340 print_public = 1; 2341 break; 2342 case 's': 2343 ca_key_path = optarg; 2344 break; 2345 case 't': 2346 key_type_name = optarg; 2347 break; 2348 case 'D': 2349 pkcs11provider = optarg; 2350 break; 2351 case 'u': 2352 update_krl = 1; 2353 break; 2354 case 'v': 2355 if (log_level == SYSLOG_LEVEL_INFO) 2356 log_level = SYSLOG_LEVEL_DEBUG1; 2357 else { 2358 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2359 log_level < SYSLOG_LEVEL_DEBUG3) 2360 log_level++; 2361 } 2362 break; 2363 case 'r': 2364 rr_hostname = optarg; 2365 break; 2366 case 'W': 2367 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2368 UINT_MAX, &errstr); 2369 if (errstr) 2370 fatal("Desired generator has bad value: %s (%s)", 2371 optarg, errstr); 2372 break; 2373 case 'a': 2374 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2375 if (errstr) 2376 fatal("Invalid number of trials: %s (%s)", 2377 optarg, errstr); 2378 break; 2379 case 'M': 2380 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2381 if (errstr) 2382 fatal("Memory limit is %s: %s", errstr, optarg); 2383 break; 2384 case 'G': 2385 do_gen_candidates = 1; 2386 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2387 sizeof(out_file)) 2388 fatal("Output filename too long"); 2389 break; 2390 case 'T': 2391 do_screen_candidates = 1; 2392 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2393 sizeof(out_file)) 2394 fatal("Output filename too long"); 2395 break; 2396 case 'K': 2397 if (strlen(optarg) >= MAXPATHLEN) 2398 fatal("Checkpoint filename too long"); 2399 checkpoint = xstrdup(optarg); 2400 break; 2401 case 'S': 2402 /* XXX - also compare length against bits */ 2403 if (BN_hex2bn(&start, optarg) == 0) 2404 fatal("Invalid start point."); 2405 break; 2406 case 'V': 2407 parse_cert_times(optarg); 2408 break; 2409 case 'z': 2410 errno = 0; 2411 cert_serial = strtoull(optarg, &ep, 10); 2412 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 2413 (errno == ERANGE && cert_serial == ULLONG_MAX)) 2414 fatal("Invalid serial number \"%s\"", optarg); 2415 break; 2416 case '?': 2417 default: 2418 usage(); 2419 } 2420 } 2421 2422 /* reinit */ 2423 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2424 2425 argv += optind; 2426 argc -= optind; 2427 2428 if (ca_key_path != NULL) { 2429 if (argc < 1 && !gen_krl) { 2430 printf("Too few arguments.\n"); 2431 usage(); 2432 } 2433 } else if (argc > 0 && !gen_krl && !check_krl) { 2434 printf("Too many arguments.\n"); 2435 usage(); 2436 } 2437 if (change_passphrase && change_comment) { 2438 printf("Can only have one of -p and -c.\n"); 2439 usage(); 2440 } 2441 if (print_fingerprint && (delete_host || hash_hosts)) { 2442 printf("Cannot use -l with -H or -R.\n"); 2443 usage(); 2444 } 2445 if (gen_krl) { 2446 do_gen_krl(pw, update_krl, argc, argv); 2447 return (0); 2448 } 2449 if (check_krl) { 2450 do_check_krl(pw, argc, argv); 2451 return (0); 2452 } 2453 if (ca_key_path != NULL) { 2454 if (cert_key_id == NULL) 2455 fatal("Must specify key id (-I) when certifying"); 2456 do_ca_sign(pw, argc, argv); 2457 } 2458 if (show_cert) 2459 do_show_cert(pw); 2460 if (delete_host || hash_hosts || find_host) 2461 do_known_hosts(pw, rr_hostname); 2462 if (pkcs11provider != NULL) 2463 do_download(pw); 2464 if (print_fingerprint || print_bubblebabble) 2465 do_fingerprint(pw); 2466 if (change_passphrase) 2467 do_change_passphrase(pw); 2468 if (change_comment) 2469 do_change_comment(pw); 2470 if (convert_to) 2471 do_convert_to(pw); 2472 if (convert_from) 2473 do_convert_from(pw); 2474 if (print_public) 2475 do_print_public(pw); 2476 if (rr_hostname != NULL) { 2477 unsigned int n = 0; 2478 2479 if (have_identity) { 2480 n = do_print_resource_record(pw, 2481 identity_file, rr_hostname); 2482 if (n == 0) { 2483 perror(identity_file); 2484 exit(1); 2485 } 2486 exit(0); 2487 } else { 2488 2489 n += do_print_resource_record(pw, 2490 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2491 n += do_print_resource_record(pw, 2492 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2493 n += do_print_resource_record(pw, 2494 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname); 2495 2496 if (n == 0) 2497 fatal("no keys found."); 2498 exit(0); 2499 } 2500 } 2501 2502 if (do_gen_candidates) { 2503 FILE *out = fopen(out_file, "w"); 2504 2505 if (out == NULL) { 2506 error("Couldn't open modulus candidate file \"%s\": %s", 2507 out_file, strerror(errno)); 2508 return (1); 2509 } 2510 if (bits == 0) 2511 bits = DEFAULT_BITS; 2512 if (gen_candidates(out, memory, bits, start) != 0) 2513 fatal("modulus candidate generation failed"); 2514 2515 return (0); 2516 } 2517 2518 if (do_screen_candidates) { 2519 FILE *in; 2520 FILE *out = fopen(out_file, "a"); 2521 2522 if (have_identity && strcmp(identity_file, "-") != 0) { 2523 if ((in = fopen(identity_file, "r")) == NULL) { 2524 fatal("Couldn't open modulus candidate " 2525 "file \"%s\": %s", identity_file, 2526 strerror(errno)); 2527 } 2528 } else 2529 in = stdin; 2530 2531 if (out == NULL) { 2532 fatal("Couldn't open moduli file \"%s\": %s", 2533 out_file, strerror(errno)); 2534 } 2535 if (prime_test(in, out, trials, generator_wanted, checkpoint, 2536 start_lineno, lines_to_process) != 0) 2537 fatal("modulus screening failed"); 2538 return (0); 2539 } 2540 2541 if (gen_all_hostkeys) { 2542 do_gen_all_hostkeys(pw); 2543 return (0); 2544 } 2545 2546 arc4random_stir(); 2547 2548 if (key_type_name == NULL) 2549 key_type_name = "rsa"; 2550 2551 type = key_type_from_name(key_type_name); 2552 type_bits_valid(type, &bits); 2553 2554 if (!quiet) 2555 printf("Generating public/private %s key pair.\n", key_type_name); 2556 private = key_generate(type, bits); 2557 if (private == NULL) { 2558 fprintf(stderr, "key_generate failed\n"); 2559 exit(1); 2560 } 2561 public = key_from_private(private); 2562 2563 if (!have_identity) 2564 ask_filename(pw, "Enter file in which to save the key"); 2565 2566 /* Create ~/.ssh directory if it doesn't already exist. */ 2567 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2568 pw->pw_dir, _PATH_SSH_USER_DIR); 2569 if (strstr(identity_file, dotsshdir) != NULL) { 2570 if (stat(dotsshdir, &st) < 0) { 2571 if (errno != ENOENT) { 2572 error("Could not stat %s: %s", dotsshdir, 2573 strerror(errno)); 2574 } else if (mkdir(dotsshdir, 0700) < 0) { 2575 error("Could not create directory '%s': %s", 2576 dotsshdir, strerror(errno)); 2577 } else if (!quiet) 2578 printf("Created directory '%s'.\n", dotsshdir); 2579 } 2580 } 2581 /* If the file already exists, ask the user to confirm. */ 2582 if (stat(identity_file, &st) >= 0) { 2583 char yesno[3]; 2584 printf("%s already exists.\n", identity_file); 2585 printf("Overwrite (y/n)? "); 2586 fflush(stdout); 2587 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2588 exit(1); 2589 if (yesno[0] != 'y' && yesno[0] != 'Y') 2590 exit(1); 2591 } 2592 /* Ask for a passphrase (twice). */ 2593 if (identity_passphrase) 2594 passphrase1 = xstrdup(identity_passphrase); 2595 else if (identity_new_passphrase) 2596 passphrase1 = xstrdup(identity_new_passphrase); 2597 else { 2598passphrase_again: 2599 passphrase1 = 2600 read_passphrase("Enter passphrase (empty for no " 2601 "passphrase): ", RP_ALLOW_STDIN); 2602 passphrase2 = read_passphrase("Enter same passphrase again: ", 2603 RP_ALLOW_STDIN); 2604 if (strcmp(passphrase1, passphrase2) != 0) { 2605 /* 2606 * The passphrases do not match. Clear them and 2607 * retry. 2608 */ 2609 memset(passphrase1, 0, strlen(passphrase1)); 2610 memset(passphrase2, 0, strlen(passphrase2)); 2611 xfree(passphrase1); 2612 xfree(passphrase2); 2613 printf("Passphrases do not match. Try again.\n"); 2614 goto passphrase_again; 2615 } 2616 /* Clear the other copy of the passphrase. */ 2617 memset(passphrase2, 0, strlen(passphrase2)); 2618 xfree(passphrase2); 2619 } 2620 2621 if (identity_comment) { 2622 strlcpy(comment, identity_comment, sizeof(comment)); 2623 } else { 2624 /* Create default comment field for the passphrase. */ 2625 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2626 } 2627 2628 /* Save the key with the given passphrase and comment. */ 2629 if (!key_save_private(private, identity_file, passphrase1, comment)) { 2630 printf("Saving the key failed: %s.\n", identity_file); 2631 memset(passphrase1, 0, strlen(passphrase1)); 2632 xfree(passphrase1); 2633 exit(1); 2634 } 2635 /* Clear the passphrase. */ 2636 memset(passphrase1, 0, strlen(passphrase1)); 2637 xfree(passphrase1); 2638 2639 /* Clear the private key and the random number generator. */ 2640 key_free(private); 2641 arc4random_stir(); 2642 2643 if (!quiet) 2644 printf("Your identification has been saved in %s.\n", identity_file); 2645 2646 strlcat(identity_file, ".pub", sizeof(identity_file)); 2647 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 2648 if (fd == -1) { 2649 printf("Could not save your public key in %s\n", identity_file); 2650 exit(1); 2651 } 2652 f = fdopen(fd, "w"); 2653 if (f == NULL) { 2654 printf("fdopen %s failed\n", identity_file); 2655 exit(1); 2656 } 2657 if (!key_write(public, f)) 2658 fprintf(stderr, "write key failed\n"); 2659 fprintf(f, " %s\n", comment); 2660 fclose(f); 2661 2662 if (!quiet) { 2663 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 2664 char *ra = key_fingerprint(public, SSH_FP_MD5, 2665 SSH_FP_RANDOMART); 2666 printf("Your public key has been saved in %s.\n", 2667 identity_file); 2668 printf("The key fingerprint is:\n"); 2669 printf("%s %s\n", fp, comment); 2670 printf("The key's randomart image is:\n"); 2671 printf("%s\n", ra); 2672 xfree(ra); 2673 xfree(fp); 2674 } 2675 2676 key_free(public); 2677 exit(0); 2678} 2679