1 /* $NetBSD: ssh-keygen.c,v 1.11 2013/03/29 16:19:45 christos Exp $ */ 2 /* $OpenBSD: ssh-keygen.c,v 1.225 2013/02/10 23:32:10 djm Exp $ */ 3 /* 4 * Author: Tatu Ylonen <ylo@cs.hut.fi> 5 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 6 * All rights reserved 7 * Identity and host key generation and maintenance. 8 * 9 * As far as I am concerned, the code I have written for this software 10 * can be used freely for any purpose. Any derived versions of this 11 * software must be clearly marked as such, and if the derived work is 12 * incompatible with the protocol description in the RFC file, it must be 13 * called by a name other than "ssh" or "Secure Shell". 14 */ 15 16 #include "includes.h" 17 __RCSID("$NetBSD: ssh-keygen.c,v 1.11 2013/03/29 16:19:45 christos Exp $"); 18 #include <sys/types.h> 19 #include <sys/socket.h> 20 #include <sys/stat.h> 21 #include <sys/param.h> 22 23 #include <openssl/evp.h> 24 #include <openssl/pem.h> 25 26 #include <errno.h> 27 #include <fcntl.h> 28 #include <pwd.h> 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <unistd.h> 33 34 #include "xmalloc.h" 35 #include "key.h" 36 #include "rsa.h" 37 #include "authfile.h" 38 #include "uuencode.h" 39 #include "buffer.h" 40 #include "pathnames.h" 41 #include "log.h" 42 #include "misc.h" 43 #include "match.h" 44 #include "hostfile.h" 45 #include "dns.h" 46 #include "ssh.h" 47 #include "ssh2.h" 48 #include "atomicio.h" 49 #include "krl.h" 50 51 #ifdef ENABLE_PKCS11 52 #include "ssh-pkcs11.h" 53 #endif 54 55 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */ 56 #define DEFAULT_BITS 2048 57 #define DEFAULT_BITS_DSA 1024 58 #define DEFAULT_BITS_ECDSA 256 59 u_int32_t bits = 0; 60 61 /* 62 * Flag indicating that we just want to change the passphrase. This can be 63 * set on the command line. 64 */ 65 int change_passphrase = 0; 66 67 /* 68 * Flag indicating that we just want to change the comment. This can be set 69 * on the command line. 70 */ 71 int change_comment = 0; 72 73 int quiet = 0; 74 75 int log_level = SYSLOG_LEVEL_INFO; 76 77 /* Flag indicating that we want to hash a known_hosts file */ 78 int hash_hosts = 0; 79 /* Flag indicating that we want lookup a host in known_hosts file */ 80 int find_host = 0; 81 /* Flag indicating that we want to delete a host from a known_hosts file */ 82 int delete_host = 0; 83 84 /* Flag indicating that we want to show the contents of a certificate */ 85 int show_cert = 0; 86 87 /* Flag indicating that we just want to see the key fingerprint */ 88 int print_fingerprint = 0; 89 int print_bubblebabble = 0; 90 91 /* The identity file name, given on the command line or entered by the user. */ 92 char identity_file[1024]; 93 int have_identity = 0; 94 95 /* This is set to the passphrase if given on the command line. */ 96 char *identity_passphrase = NULL; 97 98 /* This is set to the new passphrase if given on the command line. */ 99 char *identity_new_passphrase = NULL; 100 101 /* This is set to the new comment if given on the command line. */ 102 char *identity_comment = NULL; 103 104 /* Path to CA key when certifying keys. */ 105 char *ca_key_path = NULL; 106 107 /* Certificate serial number */ 108 unsigned long long cert_serial = 0; 109 110 /* Key type when certifying */ 111 u_int cert_key_type = SSH2_CERT_TYPE_USER; 112 113 /* "key ID" of signed key */ 114 char *cert_key_id = NULL; 115 116 /* Comma-separated list of principal names for certifying keys */ 117 char *cert_principals = NULL; 118 119 /* Validity period for certificates */ 120 u_int64_t cert_valid_from = 0; 121 u_int64_t cert_valid_to = ~0ULL; 122 123 /* Certificate options */ 124 #define CERTOPT_X_FWD (1) 125 #define CERTOPT_AGENT_FWD (1<<1) 126 #define CERTOPT_PORT_FWD (1<<2) 127 #define CERTOPT_PTY (1<<3) 128 #define CERTOPT_USER_RC (1<<4) 129 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 130 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 131 u_int32_t certflags_flags = CERTOPT_DEFAULT; 132 char *certflags_command = NULL; 133 char *certflags_src_addr = NULL; 134 135 /* Conversion to/from various formats */ 136 int convert_to = 0; 137 int convert_from = 0; 138 enum { 139 FMT_RFC4716, 140 FMT_PKCS8, 141 FMT_PEM 142 } convert_format = FMT_RFC4716; 143 int print_public = 0; 144 int print_generic = 0; 145 146 const char *key_type_name = NULL; 147 148 /* Load key from this PKCS#11 provider */ 149 char *pkcs11provider = NULL; 150 151 /* argv0 */ 152 extern char *__progname; 153 154 char hostname[MAXHOSTNAMELEN]; 155 156 /* moduli.c */ 157 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 158 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 159 unsigned long); 160 161 static void 162 type_bits_valid(int type, u_int32_t *bitsp) 163 { 164 u_int maxbits; 165 166 if (type == KEY_UNSPEC) { 167 fprintf(stderr, "unknown key type %s\n", key_type_name); 168 exit(1); 169 } 170 if (*bitsp == 0) { 171 if (type == KEY_DSA) 172 *bitsp = DEFAULT_BITS_DSA; 173 else if (type == KEY_ECDSA) 174 *bitsp = DEFAULT_BITS_ECDSA; 175 else 176 *bitsp = DEFAULT_BITS; 177 } 178 maxbits = (type == KEY_DSA) ? 179 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 180 if (*bitsp > maxbits) { 181 fprintf(stderr, "key bits exceeds maximum %d\n", maxbits); 182 exit(1); 183 } 184 if (type == KEY_DSA && *bitsp != 1024) 185 fatal("DSA keys must be 1024 bits"); 186 else if (type != KEY_ECDSA && *bitsp < 768) 187 fatal("Key must at least be 768 bits"); 188 else if (type == KEY_ECDSA && key_ecdsa_bits_to_nid(*bitsp) == -1) 189 fatal("Invalid ECDSA key length - valid lengths are " 190 "256, 384 or 521 bits"); 191 } 192 193 static void 194 ask_filename(struct passwd *pw, const char *prompt) 195 { 196 char buf[1024]; 197 const char *name = NULL; 198 199 if (key_type_name == NULL) 200 name = _PATH_SSH_CLIENT_ID_RSA; 201 else { 202 switch (key_type_from_name(key_type_name)) { 203 case KEY_RSA1: 204 name = _PATH_SSH_CLIENT_IDENTITY; 205 break; 206 case KEY_DSA_CERT: 207 case KEY_DSA_CERT_V00: 208 case KEY_DSA: 209 name = _PATH_SSH_CLIENT_ID_DSA; 210 break; 211 case KEY_ECDSA_CERT: 212 case KEY_ECDSA: 213 name = _PATH_SSH_CLIENT_ID_ECDSA; 214 break; 215 case KEY_RSA_CERT: 216 case KEY_RSA_CERT_V00: 217 case KEY_RSA: 218 name = _PATH_SSH_CLIENT_ID_RSA; 219 break; 220 default: 221 fprintf(stderr, "bad key type\n"); 222 exit(1); 223 break; 224 } 225 } 226 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 227 fprintf(stderr, "%s (%s): ", prompt, identity_file); 228 if (fgets(buf, sizeof(buf), stdin) == NULL) 229 exit(1); 230 buf[strcspn(buf, "\n")] = '\0'; 231 if (strcmp(buf, "") != 0) 232 strlcpy(identity_file, buf, sizeof(identity_file)); 233 have_identity = 1; 234 } 235 236 static Key * 237 load_identity(char *filename) 238 { 239 char *pass; 240 Key *prv; 241 242 prv = key_load_private(filename, "", NULL); 243 if (prv == NULL) { 244 if (identity_passphrase) 245 pass = xstrdup(identity_passphrase); 246 else 247 pass = read_passphrase("Enter passphrase: ", 248 RP_ALLOW_STDIN); 249 prv = key_load_private(filename, pass, NULL); 250 memset(pass, 0, strlen(pass)); 251 xfree(pass); 252 } 253 return prv; 254 } 255 256 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 257 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 258 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 259 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 260 261 __dead static void 262 do_convert_to_ssh2(struct passwd *pw, Key *k) 263 { 264 u_int len; 265 u_char *blob; 266 char comment[61]; 267 268 if (k->type == KEY_RSA1) { 269 fprintf(stderr, "version 1 keys are not supported\n"); 270 exit(1); 271 } 272 if (key_to_blob(k, &blob, &len) <= 0) { 273 fprintf(stderr, "key_to_blob failed\n"); 274 exit(1); 275 } 276 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 277 snprintf(comment, sizeof(comment), 278 "%u-bit %s, converted by %s@%s from OpenSSH", 279 key_size(k), key_type(k), 280 pw->pw_name, hostname); 281 282 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 283 fprintf(stdout, "Comment: \"%s\"\n", comment); 284 dump_base64(stdout, blob, len); 285 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 286 key_free(k); 287 xfree(blob); 288 exit(0); 289 } 290 291 __dead static void 292 do_convert_to_pkcs8(Key *k) 293 { 294 switch (key_type_plain(k->type)) { 295 case KEY_RSA1: 296 case KEY_RSA: 297 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 298 fatal("PEM_write_RSA_PUBKEY failed"); 299 break; 300 case KEY_DSA: 301 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 302 fatal("PEM_write_DSA_PUBKEY failed"); 303 break; 304 case KEY_ECDSA: 305 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 306 fatal("PEM_write_EC_PUBKEY failed"); 307 break; 308 default: 309 fatal("%s: unsupported key type %s", __func__, key_type(k)); 310 } 311 exit(0); 312 } 313 314 __dead static void 315 do_convert_to_pem(Key *k) 316 { 317 switch (key_type_plain(k->type)) { 318 case KEY_RSA1: 319 case KEY_RSA: 320 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 321 fatal("PEM_write_RSAPublicKey failed"); 322 break; 323 #if notyet /* OpenSSH 0.9.8 lacks this function */ 324 case KEY_DSA: 325 if (!PEM_write_DSAPublicKey(stdout, k->dsa)) 326 fatal("PEM_write_DSAPublicKey failed"); 327 break; 328 #endif 329 /* XXX ECDSA? */ 330 default: 331 fatal("%s: unsupported key type %s", __func__, key_type(k)); 332 } 333 exit(0); 334 } 335 336 __dead static void 337 do_convert_to(struct passwd *pw) 338 { 339 Key *k; 340 struct stat st; 341 342 if (!have_identity) 343 ask_filename(pw, "Enter file in which the key is"); 344 if (stat(identity_file, &st) < 0) 345 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 346 if ((k = key_load_public(identity_file, NULL)) == NULL) { 347 if ((k = load_identity(identity_file)) == NULL) { 348 fprintf(stderr, "load failed\n"); 349 exit(1); 350 } 351 } 352 353 switch (convert_format) { 354 case FMT_RFC4716: 355 do_convert_to_ssh2(pw, k); 356 break; 357 case FMT_PKCS8: 358 do_convert_to_pkcs8(k); 359 break; 360 case FMT_PEM: 361 do_convert_to_pem(k); 362 break; 363 default: 364 fatal("%s: unknown key format %d", __func__, convert_format); 365 } 366 exit(0); 367 } 368 369 static void 370 buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 371 { 372 u_int bignum_bits = buffer_get_int(b); 373 u_int bytes = (bignum_bits + 7) / 8; 374 375 if (buffer_len(b) < bytes) 376 fatal("buffer_get_bignum_bits: input buffer too small: " 377 "need %d have %d", bytes, buffer_len(b)); 378 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL) 379 fatal("buffer_get_bignum_bits: BN_bin2bn failed"); 380 buffer_consume(b, bytes); 381 } 382 383 static Key * 384 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 385 { 386 Buffer b; 387 Key *key = NULL; 388 char *type, *cipher; 389 u_char *sig, data[] = "abcde12345"; 390 int magic, rlen, ktype, i1, i2, i3, i4; 391 u_int slen; 392 u_long e; 393 394 buffer_init(&b); 395 buffer_append(&b, blob, blen); 396 397 magic = buffer_get_int(&b); 398 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 399 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 400 buffer_free(&b); 401 return NULL; 402 } 403 i1 = buffer_get_int(&b); 404 type = buffer_get_string(&b, NULL); 405 cipher = buffer_get_string(&b, NULL); 406 i2 = buffer_get_int(&b); 407 i3 = buffer_get_int(&b); 408 i4 = buffer_get_int(&b); 409 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 410 if (strcmp(cipher, "none") != 0) { 411 error("unsupported cipher %s", cipher); 412 xfree(cipher); 413 buffer_free(&b); 414 xfree(type); 415 return NULL; 416 } 417 xfree(cipher); 418 419 if (strstr(type, "dsa")) { 420 ktype = KEY_DSA; 421 } else if (strstr(type, "rsa")) { 422 ktype = KEY_RSA; 423 } else { 424 buffer_free(&b); 425 xfree(type); 426 return NULL; 427 } 428 key = key_new_private(ktype); 429 xfree(type); 430 431 switch (key->type) { 432 case KEY_DSA: 433 buffer_get_bignum_bits(&b, key->dsa->p); 434 buffer_get_bignum_bits(&b, key->dsa->g); 435 buffer_get_bignum_bits(&b, key->dsa->q); 436 buffer_get_bignum_bits(&b, key->dsa->pub_key); 437 buffer_get_bignum_bits(&b, key->dsa->priv_key); 438 break; 439 case KEY_RSA: 440 e = buffer_get_char(&b); 441 debug("e %lx", e); 442 if (e < 30) { 443 e <<= 8; 444 e += buffer_get_char(&b); 445 debug("e %lx", e); 446 e <<= 8; 447 e += buffer_get_char(&b); 448 debug("e %lx", e); 449 } 450 if (!BN_set_word(key->rsa->e, e)) { 451 buffer_free(&b); 452 key_free(key); 453 return NULL; 454 } 455 buffer_get_bignum_bits(&b, key->rsa->d); 456 buffer_get_bignum_bits(&b, key->rsa->n); 457 buffer_get_bignum_bits(&b, key->rsa->iqmp); 458 buffer_get_bignum_bits(&b, key->rsa->q); 459 buffer_get_bignum_bits(&b, key->rsa->p); 460 rsa_generate_additional_parameters(key->rsa); 461 break; 462 } 463 rlen = buffer_len(&b); 464 if (rlen != 0) 465 error("do_convert_private_ssh2_from_blob: " 466 "remaining bytes in key blob %d", rlen); 467 buffer_free(&b); 468 469 /* try the key */ 470 key_sign(key, &sig, &slen, data, sizeof(data)); 471 key_verify(key, sig, slen, data, sizeof(data)); 472 xfree(sig); 473 return key; 474 } 475 476 static int 477 get_line(FILE *fp, char *line, size_t len) 478 { 479 int c; 480 size_t pos = 0; 481 482 line[0] = '\0'; 483 while ((c = fgetc(fp)) != EOF) { 484 if (pos >= len - 1) { 485 fprintf(stderr, "input line too long.\n"); 486 exit(1); 487 } 488 switch (c) { 489 case '\r': 490 c = fgetc(fp); 491 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { 492 fprintf(stderr, "unget: %s\n", strerror(errno)); 493 exit(1); 494 } 495 return pos; 496 case '\n': 497 return pos; 498 } 499 line[pos++] = c; 500 line[pos] = '\0'; 501 } 502 /* We reached EOF */ 503 return -1; 504 } 505 506 static void 507 do_convert_from_ssh2(struct passwd *pw, Key **k, int *private) 508 { 509 int blen; 510 u_int len; 511 char line[1024]; 512 u_char blob[8096]; 513 char encoded[8096]; 514 int escaped = 0; 515 FILE *fp; 516 517 if ((fp = fopen(identity_file, "r")) == NULL) 518 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 519 encoded[0] = '\0'; 520 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 521 if (line[blen - 1] == '\\') 522 escaped++; 523 if (strncmp(line, "----", 4) == 0 || 524 strstr(line, ": ") != NULL) { 525 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 526 *private = 1; 527 if (strstr(line, " END ") != NULL) { 528 break; 529 } 530 /* fprintf(stderr, "ignore: %s", line); */ 531 continue; 532 } 533 if (escaped) { 534 escaped--; 535 /* fprintf(stderr, "escaped: %s", line); */ 536 continue; 537 } 538 strlcat(encoded, line, sizeof(encoded)); 539 } 540 len = strlen(encoded); 541 if (((len % 4) == 3) && 542 (encoded[len-1] == '=') && 543 (encoded[len-2] == '=') && 544 (encoded[len-3] == '=')) 545 encoded[len-3] = '\0'; 546 blen = uudecode(encoded, blob, sizeof(blob)); 547 if (blen < 0) { 548 fprintf(stderr, "uudecode failed.\n"); 549 exit(1); 550 } 551 *k = *private ? 552 do_convert_private_ssh2_from_blob(blob, blen) : 553 key_from_blob(blob, blen); 554 if (*k == NULL) { 555 fprintf(stderr, "decode blob failed.\n"); 556 exit(1); 557 } 558 fclose(fp); 559 } 560 561 static void 562 do_convert_from_pkcs8(Key **k, int *private) 563 { 564 EVP_PKEY *pubkey; 565 FILE *fp; 566 567 if ((fp = fopen(identity_file, "r")) == NULL) 568 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 569 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 570 fatal("%s: %s is not a recognised public key format", __func__, 571 identity_file); 572 } 573 fclose(fp); 574 switch (EVP_PKEY_type(pubkey->type)) { 575 case EVP_PKEY_RSA: 576 *k = key_new(KEY_UNSPEC); 577 (*k)->type = KEY_RSA; 578 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 579 break; 580 case EVP_PKEY_DSA: 581 *k = key_new(KEY_UNSPEC); 582 (*k)->type = KEY_DSA; 583 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 584 break; 585 case EVP_PKEY_EC: 586 *k = key_new(KEY_UNSPEC); 587 (*k)->type = KEY_ECDSA; 588 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 589 (*k)->ecdsa_nid = key_ecdsa_key_to_nid((*k)->ecdsa); 590 break; 591 default: 592 fatal("%s: unsupported pubkey type %d", __func__, 593 EVP_PKEY_type(pubkey->type)); 594 } 595 EVP_PKEY_free(pubkey); 596 return; 597 } 598 599 static void 600 do_convert_from_pem(Key **k, int *private) 601 { 602 FILE *fp; 603 RSA *rsa; 604 #ifdef notyet 605 DSA *dsa; 606 #endif 607 608 if ((fp = fopen(identity_file, "r")) == NULL) 609 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 610 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 611 *k = key_new(KEY_UNSPEC); 612 (*k)->type = KEY_RSA; 613 (*k)->rsa = rsa; 614 fclose(fp); 615 return; 616 } 617 #if notyet /* OpenSSH 0.9.8 lacks this function */ 618 rewind(fp); 619 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 620 *k = key_new(KEY_UNSPEC); 621 (*k)->type = KEY_DSA; 622 (*k)->dsa = dsa; 623 fclose(fp); 624 return; 625 } 626 /* XXX ECDSA */ 627 #endif 628 fatal("%s: unrecognised raw private key format", __func__); 629 } 630 631 __dead static void 632 do_convert_from(struct passwd *pw) 633 { 634 Key *k = NULL; 635 int private = 0, ok = 0; 636 struct stat st; 637 638 if (!have_identity) 639 ask_filename(pw, "Enter file in which the key is"); 640 if (stat(identity_file, &st) < 0) 641 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 642 643 switch (convert_format) { 644 case FMT_RFC4716: 645 do_convert_from_ssh2(pw, &k, &private); 646 break; 647 case FMT_PKCS8: 648 do_convert_from_pkcs8(&k, &private); 649 break; 650 case FMT_PEM: 651 do_convert_from_pem(&k, &private); 652 break; 653 default: 654 fatal("%s: unknown key format %d", __func__, convert_format); 655 } 656 657 if (!private) 658 ok = key_write(k, stdout); 659 if (ok) 660 fprintf(stdout, "\n"); 661 else { 662 switch (k->type) { 663 case KEY_DSA: 664 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 665 NULL, 0, NULL, NULL); 666 break; 667 case KEY_ECDSA: 668 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 669 NULL, 0, NULL, NULL); 670 break; 671 case KEY_RSA: 672 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 673 NULL, 0, NULL, NULL); 674 break; 675 default: 676 fatal("%s: unsupported key type %s", __func__, 677 key_type(k)); 678 } 679 } 680 681 if (!ok) { 682 fprintf(stderr, "key write failed\n"); 683 exit(1); 684 } 685 key_free(k); 686 exit(0); 687 } 688 689 __dead static void 690 do_print_public(struct passwd *pw) 691 { 692 Key *prv; 693 struct stat st; 694 695 if (!have_identity) 696 ask_filename(pw, "Enter file in which the key is"); 697 if (stat(identity_file, &st) < 0) { 698 perror(identity_file); 699 exit(1); 700 } 701 prv = load_identity(identity_file); 702 if (prv == NULL) { 703 fprintf(stderr, "load failed\n"); 704 exit(1); 705 } 706 if (!key_write(prv, stdout)) 707 fprintf(stderr, "key_write failed"); 708 key_free(prv); 709 fprintf(stdout, "\n"); 710 exit(0); 711 } 712 713 __dead static void 714 do_download(struct passwd *pw) 715 { 716 #ifdef ENABLE_PKCS11 717 Key **keys = NULL; 718 int i, nkeys; 719 enum fp_rep rep; 720 enum fp_type fptype; 721 char *fp, *ra; 722 723 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 724 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 725 726 pkcs11_init(0); 727 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 728 if (nkeys <= 0) 729 fatal("cannot read public key from pkcs11"); 730 for (i = 0; i < nkeys; i++) { 731 if (print_fingerprint) { 732 fp = key_fingerprint(keys[i], fptype, rep); 733 ra = key_fingerprint(keys[i], SSH_FP_MD5, 734 SSH_FP_RANDOMART); 735 printf("%u %s %s (PKCS11 key)\n", key_size(keys[i]), 736 fp, key_type(keys[i])); 737 if (log_level >= SYSLOG_LEVEL_VERBOSE) 738 printf("%s\n", ra); 739 xfree(ra); 740 xfree(fp); 741 } else { 742 key_write(keys[i], stdout); 743 fprintf(stdout, "\n"); 744 } 745 key_free(keys[i]); 746 } 747 xfree(keys); 748 pkcs11_terminate(); 749 exit(0); 750 #else 751 fatal("no pkcs11 support"); 752 #endif /* ENABLE_PKCS11 */ 753 } 754 755 __dead static void 756 do_fingerprint(struct passwd *pw) 757 { 758 FILE *f; 759 Key *public; 760 char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra; 761 int i, skip = 0, num = 0, invalid = 1; 762 enum fp_rep rep; 763 enum fp_type fptype; 764 struct stat st; 765 766 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 767 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 768 769 if (!have_identity) 770 ask_filename(pw, "Enter file in which the key is"); 771 if (stat(identity_file, &st) < 0) { 772 perror(identity_file); 773 exit(1); 774 } 775 public = key_load_public(identity_file, &comment); 776 if (public != NULL) { 777 fp = key_fingerprint(public, fptype, rep); 778 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 779 printf("%u %s %s (%s)\n", key_size(public), fp, comment, 780 key_type(public)); 781 if (log_level >= SYSLOG_LEVEL_VERBOSE) 782 printf("%s\n", ra); 783 key_free(public); 784 xfree(comment); 785 xfree(ra); 786 xfree(fp); 787 exit(0); 788 } 789 if (comment) { 790 xfree(comment); 791 comment = NULL; 792 } 793 794 if ((f = fopen(identity_file, "r")) == NULL) 795 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 796 797 while (fgets(line, sizeof(line), f)) { 798 if ((cp = strchr(line, '\n')) == NULL) { 799 error("line %d too long: %.40s...", 800 num + 1, line); 801 skip = 1; 802 continue; 803 } 804 num++; 805 if (skip) { 806 skip = 0; 807 continue; 808 } 809 *cp = '\0'; 810 811 /* Skip leading whitespace, empty and comment lines. */ 812 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 813 ; 814 if (!*cp || *cp == '\n' || *cp == '#') 815 continue; 816 i = strtol(cp, &ep, 10); 817 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 818 int quoted = 0; 819 comment = cp; 820 for (; *cp && (quoted || (*cp != ' ' && 821 *cp != '\t')); cp++) { 822 if (*cp == '\\' && cp[1] == '"') 823 cp++; /* Skip both */ 824 else if (*cp == '"') 825 quoted = !quoted; 826 } 827 if (!*cp) 828 continue; 829 *cp++ = '\0'; 830 } 831 ep = cp; 832 public = key_new(KEY_RSA1); 833 if (key_read(public, &cp) != 1) { 834 cp = ep; 835 key_free(public); 836 public = key_new(KEY_UNSPEC); 837 if (key_read(public, &cp) != 1) { 838 key_free(public); 839 continue; 840 } 841 } 842 comment = *cp ? cp : comment; 843 fp = key_fingerprint(public, fptype, rep); 844 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 845 printf("%u %s %s (%s)\n", key_size(public), fp, 846 comment ? comment : "no comment", key_type(public)); 847 if (log_level >= SYSLOG_LEVEL_VERBOSE) 848 printf("%s\n", ra); 849 xfree(ra); 850 xfree(fp); 851 key_free(public); 852 invalid = 0; 853 } 854 fclose(f); 855 856 if (invalid) { 857 printf("%s is not a public key file.\n", identity_file); 858 exit(1); 859 } 860 exit(0); 861 } 862 863 static void 864 do_gen_all_hostkeys(struct passwd *pw) 865 { 866 struct { 867 const char *key_type; 868 const char *key_type_display; 869 const char *path; 870 } key_types[] = { 871 { "rsa1", "RSA1", _PATH_HOST_KEY_FILE }, 872 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 873 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 874 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 875 { NULL, NULL, NULL } 876 }; 877 878 int first = 0; 879 struct stat st; 880 Key *private, *public; 881 char comment[1024]; 882 int i, type, fd; 883 FILE *f; 884 885 for (i = 0; key_types[i].key_type; i++) { 886 if (stat(key_types[i].path, &st) == 0) 887 continue; 888 if (errno != ENOENT) { 889 printf("Could not stat %s: %s", key_types[i].path, 890 strerror(errno)); 891 first = 0; 892 continue; 893 } 894 895 if (first == 0) { 896 first = 1; 897 printf("%s: generating new host keys: ", __progname); 898 } 899 printf("%s ", key_types[i].key_type_display); 900 fflush(stdout); 901 arc4random_stir(); 902 type = key_type_from_name(key_types[i].key_type); 903 strlcpy(identity_file, key_types[i].path, sizeof(identity_file)); 904 bits = 0; 905 type_bits_valid(type, &bits); 906 private = key_generate(type, bits); 907 if (private == NULL) { 908 fprintf(stderr, "key_generate failed\n"); 909 first = 0; 910 continue; 911 } 912 public = key_from_private(private); 913 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 914 hostname); 915 if (!key_save_private(private, identity_file, "", comment)) { 916 printf("Saving the key failed: %s.\n", identity_file); 917 key_free(private); 918 key_free(public); 919 first = 0; 920 continue; 921 } 922 key_free(private); 923 arc4random_stir(); 924 strlcat(identity_file, ".pub", sizeof(identity_file)); 925 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 926 if (fd == -1) { 927 printf("Could not save your public key in %s\n", 928 identity_file); 929 key_free(public); 930 first = 0; 931 continue; 932 } 933 f = fdopen(fd, "w"); 934 if (f == NULL) { 935 printf("fdopen %s failed\n", identity_file); 936 key_free(public); 937 first = 0; 938 continue; 939 } 940 if (!key_write(public, f)) { 941 fprintf(stderr, "write key failed\n"); 942 key_free(public); 943 first = 0; 944 continue; 945 } 946 fprintf(f, " %s\n", comment); 947 fclose(f); 948 key_free(public); 949 950 } 951 if (first != 0) 952 printf("\n"); 953 } 954 955 static void 956 printhost(FILE *f, const char *name, Key *public, int ca, int hash) 957 { 958 if (print_fingerprint) { 959 enum fp_rep rep; 960 enum fp_type fptype; 961 char *fp, *ra; 962 963 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 964 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 965 fp = key_fingerprint(public, fptype, rep); 966 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 967 printf("%u %s %s (%s)\n", key_size(public), fp, name, 968 key_type(public)); 969 if (log_level >= SYSLOG_LEVEL_VERBOSE) 970 printf("%s\n", ra); 971 xfree(ra); 972 xfree(fp); 973 } else { 974 if (hash && (name = host_hash(name, NULL, 0)) == NULL) 975 fatal("hash_host failed"); 976 fprintf(f, "%s%s%s ", ca ? CA_MARKER : "", ca ? " " : "", name); 977 if (!key_write(public, f)) 978 fatal("key_write failed"); 979 fprintf(f, "\n"); 980 } 981 } 982 983 __dead static void 984 do_known_hosts(struct passwd *pw, const char *name) 985 { 986 FILE *in, *out = stdout; 987 Key *pub; 988 char *cp, *cp2, *kp, *kp2; 989 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; 990 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; 991 int ca; 992 993 if (!have_identity) { 994 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 995 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 996 sizeof(identity_file)) 997 fatal("Specified known hosts path too long"); 998 xfree(cp); 999 have_identity = 1; 1000 } 1001 if ((in = fopen(identity_file, "r")) == NULL) 1002 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1003 1004 /* 1005 * Find hosts goes to stdout, hash and deletions happen in-place 1006 * A corner case is ssh-keygen -HF foo, which should go to stdout 1007 */ 1008 if (!find_host && (hash_hosts || delete_host)) { 1009 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1010 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1011 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1012 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1013 fatal("known_hosts path too long"); 1014 umask(077); 1015 if ((c = mkstemp(tmp)) == -1) 1016 fatal("mkstemp: %s", strerror(errno)); 1017 if ((out = fdopen(c, "w")) == NULL) { 1018 c = errno; 1019 unlink(tmp); 1020 fatal("fdopen: %s", strerror(c)); 1021 } 1022 inplace = 1; 1023 } 1024 1025 while (fgets(line, sizeof(line), in)) { 1026 if ((cp = strchr(line, '\n')) == NULL) { 1027 error("line %d too long: %.40s...", num + 1, line); 1028 skip = 1; 1029 invalid = 1; 1030 continue; 1031 } 1032 num++; 1033 if (skip) { 1034 skip = 0; 1035 continue; 1036 } 1037 *cp = '\0'; 1038 1039 /* Skip leading whitespace, empty and comment lines. */ 1040 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 1041 ; 1042 if (!*cp || *cp == '\n' || *cp == '#') { 1043 if (inplace) 1044 fprintf(out, "%s\n", cp); 1045 continue; 1046 } 1047 /* Check whether this is a CA key */ 1048 if (strncasecmp(cp, CA_MARKER, sizeof(CA_MARKER) - 1) == 0 && 1049 (cp[sizeof(CA_MARKER) - 1] == ' ' || 1050 cp[sizeof(CA_MARKER) - 1] == '\t')) { 1051 ca = 1; 1052 cp += sizeof(CA_MARKER); 1053 } else 1054 ca = 0; 1055 1056 /* Find the end of the host name portion. */ 1057 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) 1058 ; 1059 1060 if (*kp == '\0' || *(kp + 1) == '\0') { 1061 error("line %d missing key: %.40s...", 1062 num, line); 1063 invalid = 1; 1064 continue; 1065 } 1066 *kp++ = '\0'; 1067 kp2 = kp; 1068 1069 pub = key_new(KEY_RSA1); 1070 if (key_read(pub, &kp) != 1) { 1071 kp = kp2; 1072 key_free(pub); 1073 pub = key_new(KEY_UNSPEC); 1074 if (key_read(pub, &kp) != 1) { 1075 error("line %d invalid key: %.40s...", 1076 num, line); 1077 key_free(pub); 1078 invalid = 1; 1079 continue; 1080 } 1081 } 1082 1083 if (*cp == HASH_DELIM) { 1084 if (find_host || delete_host) { 1085 cp2 = host_hash(name, cp, strlen(cp)); 1086 if (cp2 == NULL) { 1087 error("line %d: invalid hashed " 1088 "name: %.64s...", num, line); 1089 invalid = 1; 1090 continue; 1091 } 1092 c = (strcmp(cp2, cp) == 0); 1093 if (find_host && c) { 1094 printf("# Host %s found: " 1095 "line %d type %s%s\n", name, 1096 num, key_type(pub), 1097 ca ? " (CA key)" : ""); 1098 printhost(out, cp, pub, ca, 0); 1099 } 1100 if (delete_host) { 1101 if (!c && !ca) 1102 printhost(out, cp, pub, ca, 0); 1103 else 1104 printf("# Host %s found: " 1105 "line %d type %s\n", name, 1106 num, key_type(pub)); 1107 } 1108 } else if (hash_hosts) 1109 printhost(out, cp, pub, ca, 0); 1110 } else { 1111 if (find_host || delete_host) { 1112 c = (match_hostname(name, cp, 1113 strlen(cp)) == 1); 1114 if (find_host && c) { 1115 printf("# Host %s found: " 1116 "line %d type %s%s\n", name, 1117 num, key_type(pub), 1118 ca ? " (CA key)" : ""); 1119 printhost(out, name, pub, 1120 ca, hash_hosts && !ca); 1121 } 1122 if (delete_host) { 1123 if (!c && !ca) 1124 printhost(out, cp, pub, ca, 0); 1125 else 1126 printf("# Host %s found: " 1127 "line %d type %s\n", name, 1128 num, key_type(pub)); 1129 } 1130 } else if (hash_hosts) { 1131 for (cp2 = strsep(&cp, ","); 1132 cp2 != NULL && *cp2 != '\0'; 1133 cp2 = strsep(&cp, ",")) { 1134 if (ca) { 1135 fprintf(stderr, "Warning: " 1136 "ignoring CA key for host: " 1137 "%.64s\n", cp2); 1138 printhost(out, cp2, pub, ca, 0); 1139 } else if (strcspn(cp2, "*?!") != 1140 strlen(cp2)) { 1141 fprintf(stderr, "Warning: " 1142 "ignoring host name with " 1143 "metacharacters: %.64s\n", 1144 cp2); 1145 printhost(out, cp2, pub, ca, 0); 1146 } else 1147 printhost(out, cp2, pub, ca, 1); 1148 } 1149 has_unhashed = 1; 1150 } 1151 } 1152 key_free(pub); 1153 } 1154 fclose(in); 1155 1156 if (invalid) { 1157 fprintf(stderr, "%s is not a valid known_hosts file.\n", 1158 identity_file); 1159 if (inplace) { 1160 fprintf(stderr, "Not replacing existing known_hosts " 1161 "file because of errors\n"); 1162 fclose(out); 1163 unlink(tmp); 1164 } 1165 exit(1); 1166 } 1167 1168 if (inplace) { 1169 fclose(out); 1170 1171 /* Backup existing file */ 1172 if (unlink(old) == -1 && errno != ENOENT) 1173 fatal("unlink %.100s: %s", old, strerror(errno)); 1174 if (link(identity_file, old) == -1) 1175 fatal("link %.100s to %.100s: %s", identity_file, old, 1176 strerror(errno)); 1177 /* Move new one into place */ 1178 if (rename(tmp, identity_file) == -1) { 1179 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1180 strerror(errno)); 1181 unlink(tmp); 1182 unlink(old); 1183 exit(1); 1184 } 1185 1186 fprintf(stderr, "%s updated.\n", identity_file); 1187 fprintf(stderr, "Original contents retained as %s\n", old); 1188 if (has_unhashed) { 1189 fprintf(stderr, "WARNING: %s contains unhashed " 1190 "entries\n", old); 1191 fprintf(stderr, "Delete this file to ensure privacy " 1192 "of hostnames\n"); 1193 } 1194 } 1195 1196 exit(0); 1197 } 1198 1199 /* 1200 * Perform changing a passphrase. The argument is the passwd structure 1201 * for the current user. 1202 */ 1203 __dead static void 1204 do_change_passphrase(struct passwd *pw) 1205 { 1206 char *comment; 1207 char *old_passphrase, *passphrase1, *passphrase2; 1208 struct stat st; 1209 Key *private; 1210 1211 if (!have_identity) 1212 ask_filename(pw, "Enter file in which the key is"); 1213 if (stat(identity_file, &st) < 0) { 1214 perror(identity_file); 1215 exit(1); 1216 } 1217 /* Try to load the file with empty passphrase. */ 1218 private = key_load_private(identity_file, "", &comment); 1219 if (private == NULL) { 1220 if (identity_passphrase) 1221 old_passphrase = xstrdup(identity_passphrase); 1222 else 1223 old_passphrase = 1224 read_passphrase("Enter old passphrase: ", 1225 RP_ALLOW_STDIN); 1226 private = key_load_private(identity_file, old_passphrase, 1227 &comment); 1228 memset(old_passphrase, 0, strlen(old_passphrase)); 1229 xfree(old_passphrase); 1230 if (private == NULL) { 1231 printf("Bad passphrase.\n"); 1232 exit(1); 1233 } 1234 } 1235 printf("Key has comment '%s'\n", comment); 1236 1237 /* Ask the new passphrase (twice). */ 1238 if (identity_new_passphrase) { 1239 passphrase1 = xstrdup(identity_new_passphrase); 1240 passphrase2 = NULL; 1241 } else { 1242 passphrase1 = 1243 read_passphrase("Enter new passphrase (empty for no " 1244 "passphrase): ", RP_ALLOW_STDIN); 1245 passphrase2 = read_passphrase("Enter same passphrase again: ", 1246 RP_ALLOW_STDIN); 1247 1248 /* Verify that they are the same. */ 1249 if (strcmp(passphrase1, passphrase2) != 0) { 1250 memset(passphrase1, 0, strlen(passphrase1)); 1251 memset(passphrase2, 0, strlen(passphrase2)); 1252 xfree(passphrase1); 1253 xfree(passphrase2); 1254 printf("Pass phrases do not match. Try again.\n"); 1255 exit(1); 1256 } 1257 /* Destroy the other copy. */ 1258 memset(passphrase2, 0, strlen(passphrase2)); 1259 xfree(passphrase2); 1260 } 1261 1262 /* Save the file using the new passphrase. */ 1263 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1264 printf("Saving the key failed: %s.\n", identity_file); 1265 memset(passphrase1, 0, strlen(passphrase1)); 1266 xfree(passphrase1); 1267 key_free(private); 1268 xfree(comment); 1269 exit(1); 1270 } 1271 /* Destroy the passphrase and the copy of the key in memory. */ 1272 memset(passphrase1, 0, strlen(passphrase1)); 1273 xfree(passphrase1); 1274 key_free(private); /* Destroys contents */ 1275 xfree(comment); 1276 1277 printf("Your identification has been saved with the new passphrase.\n"); 1278 exit(0); 1279 } 1280 1281 /* 1282 * Print the SSHFP RR. 1283 */ 1284 static int 1285 do_print_resource_record(struct passwd *pw, const char *fname, 1286 const char *hname) 1287 { 1288 Key *public; 1289 char *comment = NULL; 1290 struct stat st; 1291 1292 if (fname == NULL) 1293 ask_filename(pw, "Enter file in which the key is"); 1294 if (stat(fname, &st) < 0) { 1295 if (errno == ENOENT) 1296 return 0; 1297 perror(fname); 1298 exit(1); 1299 } 1300 public = key_load_public(fname, &comment); 1301 if (public != NULL) { 1302 export_dns_rr(hname, public, stdout, print_generic); 1303 key_free(public); 1304 xfree(comment); 1305 return 1; 1306 } 1307 if (comment) 1308 xfree(comment); 1309 1310 printf("failed to read v2 public key from %s.\n", fname); 1311 exit(1); 1312 } 1313 1314 /* 1315 * Change the comment of a private key file. 1316 */ 1317 __dead static void 1318 do_change_comment(struct passwd *pw) 1319 { 1320 char new_comment[1024], *comment, *passphrase; 1321 Key *private; 1322 Key *public; 1323 struct stat st; 1324 FILE *f; 1325 int fd; 1326 1327 if (!have_identity) 1328 ask_filename(pw, "Enter file in which the key is"); 1329 if (stat(identity_file, &st) < 0) { 1330 perror(identity_file); 1331 exit(1); 1332 } 1333 private = key_load_private(identity_file, "", &comment); 1334 if (private == NULL) { 1335 if (identity_passphrase) 1336 passphrase = xstrdup(identity_passphrase); 1337 else if (identity_new_passphrase) 1338 passphrase = xstrdup(identity_new_passphrase); 1339 else 1340 passphrase = read_passphrase("Enter passphrase: ", 1341 RP_ALLOW_STDIN); 1342 /* Try to load using the passphrase. */ 1343 private = key_load_private(identity_file, passphrase, &comment); 1344 if (private == NULL) { 1345 memset(passphrase, 0, strlen(passphrase)); 1346 xfree(passphrase); 1347 printf("Bad passphrase.\n"); 1348 exit(1); 1349 } 1350 } else { 1351 passphrase = xstrdup(""); 1352 } 1353 if (private->type != KEY_RSA1) { 1354 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 1355 key_free(private); 1356 exit(1); 1357 } 1358 printf("Key now has comment '%s'\n", comment); 1359 1360 if (identity_comment) { 1361 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1362 } else { 1363 printf("Enter new comment: "); 1364 fflush(stdout); 1365 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1366 memset(passphrase, 0, strlen(passphrase)); 1367 key_free(private); 1368 exit(1); 1369 } 1370 new_comment[strcspn(new_comment, "\n")] = '\0'; 1371 } 1372 1373 /* Save the file using the new passphrase. */ 1374 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 1375 printf("Saving the key failed: %s.\n", identity_file); 1376 memset(passphrase, 0, strlen(passphrase)); 1377 xfree(passphrase); 1378 key_free(private); 1379 xfree(comment); 1380 exit(1); 1381 } 1382 memset(passphrase, 0, strlen(passphrase)); 1383 xfree(passphrase); 1384 public = key_from_private(private); 1385 key_free(private); 1386 1387 strlcat(identity_file, ".pub", sizeof(identity_file)); 1388 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1389 if (fd == -1) { 1390 printf("Could not save your public key in %s\n", identity_file); 1391 exit(1); 1392 } 1393 f = fdopen(fd, "w"); 1394 if (f == NULL) { 1395 printf("fdopen %s failed\n", identity_file); 1396 exit(1); 1397 } 1398 if (!key_write(public, f)) 1399 fprintf(stderr, "write key failed\n"); 1400 key_free(public); 1401 fprintf(f, " %s\n", new_comment); 1402 fclose(f); 1403 1404 xfree(comment); 1405 1406 printf("The comment in your key file has been changed.\n"); 1407 exit(0); 1408 } 1409 1410 static const char * 1411 fmt_validity(u_int64_t valid_from, u_int64_t valid_to) 1412 { 1413 char from[32], to[32]; 1414 static char ret[64]; 1415 time_t tt; 1416 struct tm *tm; 1417 1418 *from = *to = '\0'; 1419 if (valid_from == 0 && valid_to == 0xffffffffffffffffULL) 1420 return "forever"; 1421 1422 if (valid_from != 0) { 1423 /* XXX revisit INT_MAX in 2038 :) */ 1424 tt = valid_from > INT_MAX ? INT_MAX : valid_from; 1425 tm = localtime(&tt); 1426 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); 1427 } 1428 if (valid_to != 0xffffffffffffffffULL) { 1429 /* XXX revisit INT_MAX in 2038 :) */ 1430 tt = valid_to > INT_MAX ? INT_MAX : valid_to; 1431 tm = localtime(&tt); 1432 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); 1433 } 1434 1435 if (valid_from == 0) { 1436 snprintf(ret, sizeof(ret), "before %s", to); 1437 return ret; 1438 } 1439 if (valid_to == 0xffffffffffffffffULL) { 1440 snprintf(ret, sizeof(ret), "after %s", from); 1441 return ret; 1442 } 1443 1444 snprintf(ret, sizeof(ret), "from %s to %s", from, to); 1445 return ret; 1446 } 1447 1448 static void 1449 add_flag_option(Buffer *c, const char *name) 1450 { 1451 debug3("%s: %s", __func__, name); 1452 buffer_put_cstring(c, name); 1453 buffer_put_string(c, NULL, 0); 1454 } 1455 1456 static void 1457 add_string_option(Buffer *c, const char *name, const char *value) 1458 { 1459 Buffer b; 1460 1461 debug3("%s: %s=%s", __func__, name, value); 1462 buffer_init(&b); 1463 buffer_put_cstring(&b, value); 1464 1465 buffer_put_cstring(c, name); 1466 buffer_put_string(c, buffer_ptr(&b), buffer_len(&b)); 1467 1468 buffer_free(&b); 1469 } 1470 1471 #define OPTIONS_CRITICAL 1 1472 #define OPTIONS_EXTENSIONS 2 1473 static void 1474 prepare_options_buf(Buffer *c, int which) 1475 { 1476 buffer_clear(c); 1477 if ((which & OPTIONS_CRITICAL) != 0 && 1478 certflags_command != NULL) 1479 add_string_option(c, "force-command", certflags_command); 1480 if ((which & OPTIONS_EXTENSIONS) != 0 && 1481 (certflags_flags & CERTOPT_X_FWD) != 0) 1482 add_flag_option(c, "permit-X11-forwarding"); 1483 if ((which & OPTIONS_EXTENSIONS) != 0 && 1484 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1485 add_flag_option(c, "permit-agent-forwarding"); 1486 if ((which & OPTIONS_EXTENSIONS) != 0 && 1487 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1488 add_flag_option(c, "permit-port-forwarding"); 1489 if ((which & OPTIONS_EXTENSIONS) != 0 && 1490 (certflags_flags & CERTOPT_PTY) != 0) 1491 add_flag_option(c, "permit-pty"); 1492 if ((which & OPTIONS_EXTENSIONS) != 0 && 1493 (certflags_flags & CERTOPT_USER_RC) != 0) 1494 add_flag_option(c, "permit-user-rc"); 1495 if ((which & OPTIONS_CRITICAL) != 0 && 1496 certflags_src_addr != NULL) 1497 add_string_option(c, "source-address", certflags_src_addr); 1498 } 1499 1500 static Key * 1501 load_pkcs11_key(char *path) 1502 { 1503 #ifdef ENABLE_PKCS11 1504 Key **keys = NULL, *public, *private = NULL; 1505 int i, nkeys; 1506 1507 if ((public = key_load_public(path, NULL)) == NULL) 1508 fatal("Couldn't load CA public key \"%s\"", path); 1509 1510 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1511 debug3("%s: %d keys", __func__, nkeys); 1512 if (nkeys <= 0) 1513 fatal("cannot read public key from pkcs11"); 1514 for (i = 0; i < nkeys; i++) { 1515 if (key_equal_public(public, keys[i])) { 1516 private = keys[i]; 1517 continue; 1518 } 1519 key_free(keys[i]); 1520 } 1521 xfree(keys); 1522 key_free(public); 1523 return private; 1524 #else 1525 fatal("no pkcs11 support"); 1526 #endif /* ENABLE_PKCS11 */ 1527 } 1528 1529 __dead static void 1530 do_ca_sign(struct passwd *pw, int argc, char **argv) 1531 { 1532 int i, fd; 1533 u_int n; 1534 Key *ca, *public; 1535 char *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1536 FILE *f; 1537 int v00 = 0; /* legacy keys */ 1538 1539 if (key_type_name != NULL) { 1540 switch (key_type_from_name(key_type_name)) { 1541 case KEY_RSA_CERT_V00: 1542 case KEY_DSA_CERT_V00: 1543 v00 = 1; 1544 break; 1545 case KEY_UNSPEC: 1546 if (strcasecmp(key_type_name, "v00") == 0) { 1547 v00 = 1; 1548 break; 1549 } else if (strcasecmp(key_type_name, "v01") == 0) 1550 break; 1551 /* FALLTHROUGH */ 1552 default: 1553 fprintf(stderr, "unknown key type %s\n", key_type_name); 1554 exit(1); 1555 } 1556 } 1557 1558 pkcs11_init(1); 1559 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1560 if (pkcs11provider != NULL) { 1561 if ((ca = load_pkcs11_key(tmp)) == NULL) 1562 fatal("No PKCS#11 key matching %s found", ca_key_path); 1563 } else if ((ca = load_identity(tmp)) == NULL) 1564 fatal("Couldn't load CA key \"%s\"", tmp); 1565 xfree(tmp); 1566 1567 for (i = 0; i < argc; i++) { 1568 /* Split list of principals */ 1569 n = 0; 1570 if (cert_principals != NULL) { 1571 otmp = tmp = xstrdup(cert_principals); 1572 plist = NULL; 1573 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1574 plist = xrealloc(plist, n + 1, sizeof(*plist)); 1575 if (*(plist[n] = xstrdup(cp)) == '\0') 1576 fatal("Empty principal name"); 1577 } 1578 xfree(otmp); 1579 } 1580 1581 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1582 if ((public = key_load_public(tmp, &comment)) == NULL) 1583 fatal("%s: unable to open \"%s\"", __func__, tmp); 1584 if (public->type != KEY_RSA && public->type != KEY_DSA && 1585 public->type != KEY_ECDSA) 1586 fatal("%s: key \"%s\" type %s cannot be certified", 1587 __func__, tmp, key_type(public)); 1588 1589 /* Prepare certificate to sign */ 1590 if (key_to_certified(public, v00) != 0) 1591 fatal("Could not upgrade key %s to certificate", tmp); 1592 public->cert->type = cert_key_type; 1593 public->cert->serial = (u_int64_t)cert_serial; 1594 public->cert->key_id = xstrdup(cert_key_id); 1595 public->cert->nprincipals = n; 1596 public->cert->principals = plist; 1597 public->cert->valid_after = cert_valid_from; 1598 public->cert->valid_before = cert_valid_to; 1599 if (v00) { 1600 prepare_options_buf(&public->cert->critical, 1601 OPTIONS_CRITICAL|OPTIONS_EXTENSIONS); 1602 } else { 1603 prepare_options_buf(&public->cert->critical, 1604 OPTIONS_CRITICAL); 1605 prepare_options_buf(&public->cert->extensions, 1606 OPTIONS_EXTENSIONS); 1607 } 1608 public->cert->signature_key = key_from_private(ca); 1609 1610 if (key_certify(public, ca) != 0) 1611 fatal("Couldn't not certify key %s", tmp); 1612 1613 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1614 *cp = '\0'; 1615 xasprintf(&out, "%s-cert.pub", tmp); 1616 xfree(tmp); 1617 1618 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1619 fatal("Could not open \"%s\" for writing: %s", out, 1620 strerror(errno)); 1621 if ((f = fdopen(fd, "w")) == NULL) 1622 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1623 if (!key_write(public, f)) 1624 fatal("Could not write certified key to %s", out); 1625 fprintf(f, " %s\n", comment); 1626 fclose(f); 1627 1628 if (!quiet) { 1629 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1630 "valid %s", key_cert_type(public), 1631 out, public->cert->key_id, 1632 (unsigned long long)public->cert->serial, 1633 cert_principals != NULL ? " for " : "", 1634 cert_principals != NULL ? cert_principals : "", 1635 fmt_validity(cert_valid_from, cert_valid_to)); 1636 } 1637 1638 key_free(public); 1639 xfree(out); 1640 } 1641 pkcs11_terminate(); 1642 exit(0); 1643 } 1644 1645 static u_int64_t 1646 parse_relative_time(const char *s, time_t now) 1647 { 1648 int64_t mul, secs; 1649 1650 mul = *s == '-' ? -1 : 1; 1651 1652 if ((secs = convtime(s + 1)) == -1) 1653 fatal("Invalid relative certificate time %s", s); 1654 if (mul == -1 && secs > now) 1655 fatal("Certificate time %s cannot be represented", s); 1656 return now + (u_int64_t)(secs * mul); 1657 } 1658 1659 static u_int64_t 1660 parse_absolute_time(const char *s) 1661 { 1662 struct tm tm; 1663 time_t tt; 1664 char buf[32]; 1665 const char *fmt; 1666 1667 /* 1668 * POSIX strptime says "The application shall ensure that there 1669 * is white-space or other non-alphanumeric characters between 1670 * any two conversion specifications" so arrange things this way. 1671 */ 1672 switch (strlen(s)) { 1673 case 8: 1674 fmt = "%Y-%m-%d"; 1675 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1676 break; 1677 case 14: 1678 fmt = "%Y-%m-%dT%H:%M:%S"; 1679 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1680 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1681 break; 1682 default: 1683 fatal("Invalid certificate time format %s", s); 1684 } 1685 1686 bzero(&tm, sizeof(tm)); 1687 if (strptime(buf, fmt, &tm) == NULL) 1688 fatal("Invalid certificate time %s", s); 1689 if ((tt = mktime(&tm)) < 0) 1690 fatal("Certificate time %s cannot be represented", s); 1691 return (u_int64_t)tt; 1692 } 1693 1694 static void 1695 parse_cert_times(char *timespec) 1696 { 1697 char *from, *to; 1698 time_t now = time(NULL); 1699 int64_t secs; 1700 1701 /* +timespec relative to now */ 1702 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1703 if ((secs = convtime(timespec + 1)) == -1) 1704 fatal("Invalid relative certificate life %s", timespec); 1705 cert_valid_to = now + secs; 1706 /* 1707 * Backdate certificate one minute to avoid problems on hosts 1708 * with poorly-synchronised clocks. 1709 */ 1710 cert_valid_from = ((now - 59)/ 60) * 60; 1711 return; 1712 } 1713 1714 /* 1715 * from:to, where 1716 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1717 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1718 */ 1719 from = xstrdup(timespec); 1720 to = strchr(from, ':'); 1721 if (to == NULL || from == to || *(to + 1) == '\0') 1722 fatal("Invalid certificate life specification %s", timespec); 1723 *to++ = '\0'; 1724 1725 if (*from == '-' || *from == '+') 1726 cert_valid_from = parse_relative_time(from, now); 1727 else 1728 cert_valid_from = parse_absolute_time(from); 1729 1730 if (*to == '-' || *to == '+') 1731 cert_valid_to = parse_relative_time(to, cert_valid_from); 1732 else 1733 cert_valid_to = parse_absolute_time(to); 1734 1735 if (cert_valid_to <= cert_valid_from) 1736 fatal("Empty certificate validity interval"); 1737 xfree(from); 1738 } 1739 1740 static void 1741 add_cert_option(char *opt) 1742 { 1743 char *val; 1744 1745 if (strcasecmp(opt, "clear") == 0) 1746 certflags_flags = 0; 1747 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1748 certflags_flags &= ~CERTOPT_X_FWD; 1749 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1750 certflags_flags |= CERTOPT_X_FWD; 1751 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1752 certflags_flags &= ~CERTOPT_AGENT_FWD; 1753 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1754 certflags_flags |= CERTOPT_AGENT_FWD; 1755 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1756 certflags_flags &= ~CERTOPT_PORT_FWD; 1757 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1758 certflags_flags |= CERTOPT_PORT_FWD; 1759 else if (strcasecmp(opt, "no-pty") == 0) 1760 certflags_flags &= ~CERTOPT_PTY; 1761 else if (strcasecmp(opt, "permit-pty") == 0) 1762 certflags_flags |= CERTOPT_PTY; 1763 else if (strcasecmp(opt, "no-user-rc") == 0) 1764 certflags_flags &= ~CERTOPT_USER_RC; 1765 else if (strcasecmp(opt, "permit-user-rc") == 0) 1766 certflags_flags |= CERTOPT_USER_RC; 1767 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1768 val = opt + 14; 1769 if (*val == '\0') 1770 fatal("Empty force-command option"); 1771 if (certflags_command != NULL) 1772 fatal("force-command already specified"); 1773 certflags_command = xstrdup(val); 1774 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1775 val = opt + 15; 1776 if (*val == '\0') 1777 fatal("Empty source-address option"); 1778 if (certflags_src_addr != NULL) 1779 fatal("source-address already specified"); 1780 if (addr_match_cidr_list(NULL, val) != 0) 1781 fatal("Invalid source-address list"); 1782 certflags_src_addr = xstrdup(val); 1783 } else 1784 fatal("Unsupported certificate option \"%s\"", opt); 1785 } 1786 1787 static void 1788 show_options(const Buffer *optbuf, int v00, int in_critical) 1789 { 1790 u_char *name, *data; 1791 u_int dlen; 1792 Buffer options, option; 1793 1794 buffer_init(&options); 1795 buffer_append(&options, buffer_ptr(optbuf), buffer_len(optbuf)); 1796 1797 buffer_init(&option); 1798 while (buffer_len(&options) != 0) { 1799 name = buffer_get_string(&options, NULL); 1800 data = buffer_get_string_ptr(&options, &dlen); 1801 buffer_append(&option, data, dlen); 1802 printf(" %s", name); 1803 if ((v00 || !in_critical) && 1804 (strcmp(name, "permit-X11-forwarding") == 0 || 1805 strcmp(name, "permit-agent-forwarding") == 0 || 1806 strcmp(name, "permit-port-forwarding") == 0 || 1807 strcmp(name, "permit-pty") == 0 || 1808 strcmp(name, "permit-user-rc") == 0)) 1809 printf("\n"); 1810 else if ((v00 || in_critical) && 1811 (strcmp(name, "force-command") == 0 || 1812 strcmp(name, "source-address") == 0)) { 1813 data = buffer_get_string(&option, NULL); 1814 printf(" %s\n", data); 1815 xfree(data); 1816 } else { 1817 printf(" UNKNOWN OPTION (len %u)\n", 1818 buffer_len(&option)); 1819 buffer_clear(&option); 1820 } 1821 xfree(name); 1822 if (buffer_len(&option) != 0) 1823 fatal("Option corrupt: extra data at end"); 1824 } 1825 buffer_free(&option); 1826 buffer_free(&options); 1827 } 1828 1829 __dead static void 1830 do_show_cert(struct passwd *pw) 1831 { 1832 Key *key; 1833 struct stat st; 1834 char *key_fp, *ca_fp; 1835 u_int i, v00; 1836 1837 if (!have_identity) 1838 ask_filename(pw, "Enter file in which the key is"); 1839 if (stat(identity_file, &st) < 0) 1840 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1841 if ((key = key_load_public(identity_file, NULL)) == NULL) 1842 fatal("%s is not a public key", identity_file); 1843 if (!key_is_cert(key)) 1844 fatal("%s is not a certificate", identity_file); 1845 v00 = key->type == KEY_RSA_CERT_V00 || key->type == KEY_DSA_CERT_V00; 1846 1847 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); 1848 ca_fp = key_fingerprint(key->cert->signature_key, 1849 SSH_FP_MD5, SSH_FP_HEX); 1850 1851 printf("%s:\n", identity_file); 1852 printf(" Type: %s %s certificate\n", key_ssh_name(key), 1853 key_cert_type(key)); 1854 printf(" Public key: %s %s\n", key_type(key), key_fp); 1855 printf(" Signing CA: %s %s\n", 1856 key_type(key->cert->signature_key), ca_fp); 1857 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1858 if (!v00) { 1859 printf(" Serial: %llu\n", 1860 (unsigned long long)key->cert->serial); 1861 } 1862 printf(" Valid: %s\n", 1863 fmt_validity(key->cert->valid_after, key->cert->valid_before)); 1864 printf(" Principals: "); 1865 if (key->cert->nprincipals == 0) 1866 printf("(none)\n"); 1867 else { 1868 for (i = 0; i < key->cert->nprincipals; i++) 1869 printf("\n %s", 1870 key->cert->principals[i]); 1871 printf("\n"); 1872 } 1873 printf(" Critical Options: "); 1874 if (buffer_len(&key->cert->critical) == 0) 1875 printf("(none)\n"); 1876 else { 1877 printf("\n"); 1878 show_options(&key->cert->critical, v00, 1); 1879 } 1880 if (!v00) { 1881 printf(" Extensions: "); 1882 if (buffer_len(&key->cert->extensions) == 0) 1883 printf("(none)\n"); 1884 else { 1885 printf("\n"); 1886 show_options(&key->cert->extensions, v00, 0); 1887 } 1888 } 1889 exit(0); 1890 } 1891 1892 static void 1893 load_krl(const char *path, struct ssh_krl **krlp) 1894 { 1895 Buffer krlbuf; 1896 int fd; 1897 1898 buffer_init(&krlbuf); 1899 if ((fd = open(path, O_RDONLY)) == -1) 1900 fatal("open %s: %s", path, strerror(errno)); 1901 if (!key_load_file(fd, path, &krlbuf)) 1902 fatal("Unable to load KRL"); 1903 close(fd); 1904 /* XXX check sigs */ 1905 if (ssh_krl_from_blob(&krlbuf, krlp, NULL, 0) != 0 || 1906 *krlp == NULL) 1907 fatal("Invalid KRL file"); 1908 buffer_free(&krlbuf); 1909 } 1910 1911 static void 1912 update_krl_from_file(struct passwd *pw, const char *file, const Key *ca, 1913 struct ssh_krl *krl) 1914 { 1915 Key *key = NULL; 1916 u_long lnum = 0; 1917 char *path, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES]; 1918 unsigned long long serial, serial2; 1919 int i, was_explicit_key, was_sha1, r; 1920 FILE *krl_spec; 1921 1922 path = tilde_expand_filename(file, pw->pw_uid); 1923 if (strcmp(path, "-") == 0) { 1924 krl_spec = stdin; 1925 free(path); 1926 path = xstrdup("(standard input)"); 1927 } else if ((krl_spec = fopen(path, "r")) == NULL) 1928 fatal("fopen %s: %s", path, strerror(errno)); 1929 1930 if (!quiet) 1931 printf("Revoking from %s\n", path); 1932 while (read_keyfile_line(krl_spec, path, line, sizeof(line), 1933 &lnum) == 0) { 1934 was_explicit_key = was_sha1 = 0; 1935 cp = line + strspn(line, " \t"); 1936 /* Trim trailing space, comments and strip \n */ 1937 for (i = 0, r = -1; cp[i] != '\0'; i++) { 1938 if (cp[i] == '#' || cp[i] == '\n') { 1939 cp[i] = '\0'; 1940 break; 1941 } 1942 if (cp[i] == ' ' || cp[i] == '\t') { 1943 /* Remember the start of a span of whitespace */ 1944 if (r == -1) 1945 r = i; 1946 } else 1947 r = -1; 1948 } 1949 if (r != -1) 1950 cp[r] = '\0'; 1951 if (*cp == '\0') 1952 continue; 1953 if (strncasecmp(cp, "serial:", 7) == 0) { 1954 if (ca == NULL) { 1955 fatal("revoking certificated by serial number " 1956 "requires specification of a CA key"); 1957 } 1958 cp += 7; 1959 cp = cp + strspn(cp, " \t"); 1960 errno = 0; 1961 serial = strtoull(cp, &ep, 0); 1962 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 1963 fatal("%s:%lu: invalid serial \"%s\"", 1964 path, lnum, cp); 1965 if (errno == ERANGE && serial == ULLONG_MAX) 1966 fatal("%s:%lu: serial out of range", 1967 path, lnum); 1968 serial2 = serial; 1969 if (*ep == '-') { 1970 cp = ep + 1; 1971 errno = 0; 1972 serial2 = strtoull(cp, &ep, 0); 1973 if (*cp == '\0' || *ep != '\0') 1974 fatal("%s:%lu: invalid serial \"%s\"", 1975 path, lnum, cp); 1976 if (errno == ERANGE && serial2 == ULLONG_MAX) 1977 fatal("%s:%lu: serial out of range", 1978 path, lnum); 1979 if (serial2 <= serial) 1980 fatal("%s:%lu: invalid serial range " 1981 "%llu:%llu", path, lnum, 1982 (unsigned long long)serial, 1983 (unsigned long long)serial2); 1984 } 1985 if (ssh_krl_revoke_cert_by_serial_range(krl, 1986 ca, serial, serial2) != 0) { 1987 fatal("%s: revoke serial failed", 1988 __func__); 1989 } 1990 } else if (strncasecmp(cp, "id:", 3) == 0) { 1991 if (ca == NULL) { 1992 fatal("revoking certificated by key ID " 1993 "requires specification of a CA key"); 1994 } 1995 cp += 3; 1996 cp = cp + strspn(cp, " \t"); 1997 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 1998 fatal("%s: revoke key ID failed", __func__); 1999 } else { 2000 if (strncasecmp(cp, "key:", 4) == 0) { 2001 cp += 4; 2002 cp = cp + strspn(cp, " \t"); 2003 was_explicit_key = 1; 2004 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2005 cp += 5; 2006 cp = cp + strspn(cp, " \t"); 2007 was_sha1 = 1; 2008 } else { 2009 /* 2010 * Just try to process the line as a key. 2011 * Parsing will fail if it isn't. 2012 */ 2013 } 2014 if ((key = key_new(KEY_UNSPEC)) == NULL) 2015 fatal("key_new"); 2016 if (key_read(key, &cp) != 1) 2017 fatal("%s:%lu: invalid key", path, lnum); 2018 if (was_explicit_key) 2019 r = ssh_krl_revoke_key_explicit(krl, key); 2020 else if (was_sha1) 2021 r = ssh_krl_revoke_key_sha1(krl, key); 2022 else 2023 r = ssh_krl_revoke_key(krl, key); 2024 if (r != 0) 2025 fatal("%s: revoke key failed", __func__); 2026 key_free(key); 2027 } 2028 } 2029 if (strcmp(path, "-") != 0) 2030 fclose(krl_spec); 2031 } 2032 2033 static void 2034 do_gen_krl(struct passwd *pw, int updating, int argc, char **argv) 2035 { 2036 struct ssh_krl *krl; 2037 struct stat sb; 2038 Key *ca = NULL; 2039 int fd, i; 2040 char *tmp; 2041 Buffer kbuf; 2042 2043 if (*identity_file == '\0') 2044 fatal("KRL generation requires an output file"); 2045 if (stat(identity_file, &sb) == -1) { 2046 if (errno != ENOENT) 2047 fatal("Cannot access KRL \"%s\": %s", 2048 identity_file, strerror(errno)); 2049 if (updating) 2050 fatal("KRL \"%s\" does not exist", identity_file); 2051 } 2052 if (ca_key_path != NULL) { 2053 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2054 if ((ca = key_load_public(tmp, NULL)) == NULL) 2055 fatal("Cannot load CA public key %s", tmp); 2056 xfree(tmp); 2057 } 2058 2059 if (updating) 2060 load_krl(identity_file, &krl); 2061 else if ((krl = ssh_krl_init()) == NULL) 2062 fatal("couldn't create KRL"); 2063 2064 if (cert_serial != 0) 2065 ssh_krl_set_version(krl, cert_serial); 2066 if (identity_comment != NULL) 2067 ssh_krl_set_comment(krl, identity_comment); 2068 2069 for (i = 0; i < argc; i++) 2070 update_krl_from_file(pw, argv[i], ca, krl); 2071 2072 buffer_init(&kbuf); 2073 if (ssh_krl_to_blob(krl, &kbuf, NULL, 0) != 0) 2074 fatal("Couldn't generate KRL"); 2075 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2076 fatal("open %s: %s", identity_file, strerror(errno)); 2077 if (atomicio(vwrite, fd, buffer_ptr(&kbuf), buffer_len(&kbuf)) != 2078 buffer_len(&kbuf)) 2079 fatal("write %s: %s", identity_file, strerror(errno)); 2080 close(fd); 2081 buffer_free(&kbuf); 2082 ssh_krl_free(krl); 2083 } 2084 2085 static void 2086 do_check_krl(struct passwd *pw, int argc, char **argv) 2087 { 2088 int i, r, ret = 0; 2089 char *comment; 2090 struct ssh_krl *krl; 2091 Key *k; 2092 2093 if (*identity_file == '\0') 2094 fatal("KRL checking requires an input file"); 2095 load_krl(identity_file, &krl); 2096 for (i = 0; i < argc; i++) { 2097 if ((k = key_load_public(argv[i], &comment)) == NULL) 2098 fatal("Cannot load public key %s", argv[i]); 2099 r = ssh_krl_check_key(krl, k); 2100 printf("%s%s%s%s: %s\n", argv[i], 2101 *comment ? " (" : "", comment, *comment ? ")" : "", 2102 r == 0 ? "ok" : "REVOKED"); 2103 if (r != 0) 2104 ret = 1; 2105 key_free(k); 2106 free(comment); 2107 } 2108 ssh_krl_free(krl); 2109 exit(ret); 2110 } 2111 2112 static void 2113 usage(void) 2114 { 2115 fprintf(stderr, "usage: %s [options]\n", __progname); 2116 fprintf(stderr, "Options:\n"); 2117 fprintf(stderr, " -A Generate non-existent host keys for all key types.\n"); 2118 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); 2119 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 2120 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 2121 fprintf(stderr, " -C comment Provide new comment.\n"); 2122 fprintf(stderr, " -c Change comment in private and public key files.\n"); 2123 #ifdef ENABLE_PKCS11 2124 fprintf(stderr, " -D pkcs11 Download public key from pkcs11 token.\n"); 2125 #endif 2126 fprintf(stderr, " -e Export OpenSSH to foreign format key file.\n"); 2127 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); 2128 fprintf(stderr, " -f filename Filename of the key file.\n"); 2129 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); 2130 fprintf(stderr, " -g Use generic DNS resource record format.\n"); 2131 fprintf(stderr, " -H Hash names in known_hosts file.\n"); 2132 fprintf(stderr, " -h Generate host certificate instead of a user certificate.\n"); 2133 fprintf(stderr, " -I key_id Key identifier to include in certificate.\n"); 2134 fprintf(stderr, " -i Import foreign format to OpenSSH key file.\n"); 2135 fprintf(stderr, " -J number Screen this number of moduli lines.\n"); 2136 fprintf(stderr, " -j number Start screening moduli at specified line.\n"); 2137 fprintf(stderr, " -K checkpt Write checkpoints to this file.\n"); 2138 fprintf(stderr, " -k Generate a KRL file.\n"); 2139 fprintf(stderr, " -L Print the contents of a certificate.\n"); 2140 fprintf(stderr, " -l Show fingerprint of key file.\n"); 2141 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); 2142 fprintf(stderr, " -m key_fmt Conversion format for -e/-i (PEM|PKCS8|RFC4716).\n"); 2143 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 2144 fprintf(stderr, " -n name,... User/host principal names to include in certificate\n"); 2145 fprintf(stderr, " -O option Specify a certificate option.\n"); 2146 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 2147 fprintf(stderr, " -p Change passphrase of private key file.\n"); 2148 fprintf(stderr, " -Q Test whether key(s) are revoked in KRL.\n"); 2149 fprintf(stderr, " -q Quiet.\n"); 2150 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); 2151 fprintf(stderr, " -r hostname Print DNS resource record.\n"); 2152 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); 2153 fprintf(stderr, " -s ca_key Certify keys with CA key.\n"); 2154 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); 2155 fprintf(stderr, " -t type Specify type of key to create.\n"); 2156 fprintf(stderr, " -u Update KRL rather than creating a new one.\n"); 2157 fprintf(stderr, " -V from:to Specify certificate validity interval.\n"); 2158 fprintf(stderr, " -v Verbose.\n"); 2159 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); 2160 fprintf(stderr, " -y Read private key file and print public key.\n"); 2161 fprintf(stderr, " -z serial Specify a serial number.\n"); 2162 2163 exit(1); 2164 } 2165 2166 /* 2167 * Main program for key management. 2168 */ 2169 int 2170 main(int argc, char **argv) 2171 { 2172 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 2173 char *checkpoint = NULL; 2174 char out_file[MAXPATHLEN], *ep, *rr_hostname = NULL; 2175 Key *private, *public; 2176 struct passwd *pw; 2177 struct stat st; 2178 int opt, type, fd; 2179 u_int32_t memory = 0, generator_wanted = 0, trials = 100; 2180 int do_gen_candidates = 0, do_screen_candidates = 0; 2181 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 2182 unsigned long start_lineno = 0, lines_to_process = 0; 2183 BIGNUM *start = NULL; 2184 FILE *f; 2185 const char *errstr; 2186 2187 extern int optind; 2188 extern char *optarg; 2189 2190 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 2191 sanitise_stdfd(); 2192 2193 OpenSSL_add_all_algorithms(); 2194 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 2195 2196 /* we need this for the home * directory. */ 2197 pw = getpwuid(getuid()); 2198 if (!pw) { 2199 printf("You don't exist, go away!\n"); 2200 exit(1); 2201 } 2202 if (gethostname(hostname, sizeof(hostname)) < 0) { 2203 perror("gethostname"); 2204 exit(1); 2205 } 2206 2207 while ((opt = getopt(argc, argv, "ABHLQXceghiklpquvxy" 2208 "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) { 2209 switch (opt) { 2210 case 'A': 2211 gen_all_hostkeys = 1; 2212 break; 2213 case 'b': 2214 bits = (u_int32_t)strtonum(optarg, 256, 32768, &errstr); 2215 if (errstr) 2216 fatal("Bits has bad value %s (%s)", 2217 optarg, errstr); 2218 break; 2219 case 'F': 2220 find_host = 1; 2221 rr_hostname = optarg; 2222 break; 2223 case 'H': 2224 hash_hosts = 1; 2225 break; 2226 case 'I': 2227 cert_key_id = optarg; 2228 break; 2229 case 'J': 2230 lines_to_process = strtoul(optarg, NULL, 10); 2231 break; 2232 case 'j': 2233 start_lineno = strtoul(optarg, NULL, 10); 2234 break; 2235 case 'R': 2236 delete_host = 1; 2237 rr_hostname = optarg; 2238 break; 2239 case 'L': 2240 show_cert = 1; 2241 break; 2242 case 'l': 2243 print_fingerprint = 1; 2244 break; 2245 case 'B': 2246 print_bubblebabble = 1; 2247 break; 2248 case 'm': 2249 if (strcasecmp(optarg, "RFC4716") == 0 || 2250 strcasecmp(optarg, "ssh2") == 0) { 2251 convert_format = FMT_RFC4716; 2252 break; 2253 } 2254 if (strcasecmp(optarg, "PKCS8") == 0) { 2255 convert_format = FMT_PKCS8; 2256 break; 2257 } 2258 if (strcasecmp(optarg, "PEM") == 0) { 2259 convert_format = FMT_PEM; 2260 break; 2261 } 2262 fatal("Unsupported conversion format \"%s\"", optarg); 2263 case 'n': 2264 cert_principals = optarg; 2265 break; 2266 case 'p': 2267 change_passphrase = 1; 2268 break; 2269 case 'c': 2270 change_comment = 1; 2271 break; 2272 case 'f': 2273 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= 2274 sizeof(identity_file)) 2275 fatal("Identity filename too long"); 2276 have_identity = 1; 2277 break; 2278 case 'g': 2279 print_generic = 1; 2280 break; 2281 case 'P': 2282 identity_passphrase = optarg; 2283 break; 2284 case 'N': 2285 identity_new_passphrase = optarg; 2286 break; 2287 case 'Q': 2288 check_krl = 1; 2289 break; 2290 case 'O': 2291 add_cert_option(optarg); 2292 break; 2293 case 'C': 2294 identity_comment = optarg; 2295 break; 2296 case 'q': 2297 quiet = 1; 2298 break; 2299 case 'e': 2300 case 'x': 2301 /* export key */ 2302 convert_to = 1; 2303 break; 2304 case 'h': 2305 cert_key_type = SSH2_CERT_TYPE_HOST; 2306 certflags_flags = 0; 2307 break; 2308 case 'k': 2309 gen_krl = 1; 2310 break; 2311 case 'i': 2312 case 'X': 2313 /* import key */ 2314 convert_from = 1; 2315 break; 2316 case 'y': 2317 print_public = 1; 2318 break; 2319 case 's': 2320 ca_key_path = optarg; 2321 break; 2322 case 't': 2323 key_type_name = optarg; 2324 break; 2325 case 'D': 2326 pkcs11provider = optarg; 2327 break; 2328 case 'u': 2329 update_krl = 1; 2330 break; 2331 case 'v': 2332 if (log_level == SYSLOG_LEVEL_INFO) 2333 log_level = SYSLOG_LEVEL_DEBUG1; 2334 else { 2335 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2336 log_level < SYSLOG_LEVEL_DEBUG3) 2337 log_level++; 2338 } 2339 break; 2340 case 'r': 2341 rr_hostname = optarg; 2342 break; 2343 case 'W': 2344 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2345 UINT_MAX, &errstr); 2346 if (errstr) 2347 fatal("Desired generator has bad value: %s (%s)", 2348 optarg, errstr); 2349 break; 2350 case 'a': 2351 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2352 if (errstr) 2353 fatal("Invalid number of trials: %s (%s)", 2354 optarg, errstr); 2355 break; 2356 case 'M': 2357 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2358 if (errstr) 2359 fatal("Memory limit is %s: %s", errstr, optarg); 2360 break; 2361 case 'G': 2362 do_gen_candidates = 1; 2363 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2364 sizeof(out_file)) 2365 fatal("Output filename too long"); 2366 break; 2367 case 'T': 2368 do_screen_candidates = 1; 2369 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2370 sizeof(out_file)) 2371 fatal("Output filename too long"); 2372 break; 2373 case 'K': 2374 if (strlen(optarg) >= MAXPATHLEN) 2375 fatal("Checkpoint filename too long"); 2376 checkpoint = xstrdup(optarg); 2377 break; 2378 case 'S': 2379 /* XXX - also compare length against bits */ 2380 if (BN_hex2bn(&start, optarg) == 0) 2381 fatal("Invalid start point."); 2382 break; 2383 case 'V': 2384 parse_cert_times(optarg); 2385 break; 2386 case 'z': 2387 errno = 0; 2388 cert_serial = strtoull(optarg, &ep, 10); 2389 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 2390 (errno == ERANGE && cert_serial == ULLONG_MAX)) 2391 fatal("Invalid serial number \"%s\"", optarg); 2392 break; 2393 case '?': 2394 default: 2395 usage(); 2396 } 2397 } 2398 2399 /* reinit */ 2400 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2401 2402 argv += optind; 2403 argc -= optind; 2404 2405 if (ca_key_path != NULL) { 2406 if (argc < 1 && !gen_krl) { 2407 printf("Too few arguments.\n"); 2408 usage(); 2409 } 2410 } else if (argc > 0 && !gen_krl && !check_krl) { 2411 printf("Too many arguments.\n"); 2412 usage(); 2413 } 2414 if (change_passphrase && change_comment) { 2415 printf("Can only have one of -p and -c.\n"); 2416 usage(); 2417 } 2418 if (print_fingerprint && (delete_host || hash_hosts)) { 2419 printf("Cannot use -l with -H or -R.\n"); 2420 usage(); 2421 } 2422 if (gen_krl) { 2423 do_gen_krl(pw, update_krl, argc, argv); 2424 return (0); 2425 } 2426 if (check_krl) { 2427 do_check_krl(pw, argc, argv); 2428 return (0); 2429 } 2430 if (ca_key_path != NULL) { 2431 if (cert_key_id == NULL) 2432 fatal("Must specify key id (-I) when certifying"); 2433 do_ca_sign(pw, argc, argv); 2434 } 2435 if (show_cert) 2436 do_show_cert(pw); 2437 if (delete_host || hash_hosts || find_host) 2438 do_known_hosts(pw, rr_hostname); 2439 if (pkcs11provider != NULL) 2440 do_download(pw); 2441 if (print_fingerprint || print_bubblebabble) 2442 do_fingerprint(pw); 2443 if (change_passphrase) 2444 do_change_passphrase(pw); 2445 if (change_comment) 2446 do_change_comment(pw); 2447 if (convert_to) 2448 do_convert_to(pw); 2449 if (convert_from) 2450 do_convert_from(pw); 2451 if (print_public) 2452 do_print_public(pw); 2453 if (rr_hostname != NULL) { 2454 unsigned int n = 0; 2455 2456 if (have_identity) { 2457 n = do_print_resource_record(pw, 2458 identity_file, rr_hostname); 2459 if (n == 0) { 2460 perror(identity_file); 2461 exit(1); 2462 } 2463 exit(0); 2464 } else { 2465 2466 n += do_print_resource_record(pw, 2467 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2468 n += do_print_resource_record(pw, 2469 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2470 n += do_print_resource_record(pw, 2471 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname); 2472 2473 if (n == 0) 2474 fatal("no keys found."); 2475 exit(0); 2476 } 2477 } 2478 2479 if (do_gen_candidates) { 2480 FILE *out = fopen(out_file, "w"); 2481 2482 if (out == NULL) { 2483 error("Couldn't open modulus candidate file \"%s\": %s", 2484 out_file, strerror(errno)); 2485 return (1); 2486 } 2487 if (bits == 0) 2488 bits = DEFAULT_BITS; 2489 if (gen_candidates(out, memory, bits, start) != 0) 2490 fatal("modulus candidate generation failed"); 2491 2492 return (0); 2493 } 2494 2495 if (do_screen_candidates) { 2496 FILE *in; 2497 FILE *out = fopen(out_file, "a"); 2498 2499 if (have_identity && strcmp(identity_file, "-") != 0) { 2500 if ((in = fopen(identity_file, "r")) == NULL) { 2501 fatal("Couldn't open modulus candidate " 2502 "file \"%s\": %s", identity_file, 2503 strerror(errno)); 2504 } 2505 } else 2506 in = stdin; 2507 2508 if (out == NULL) { 2509 fatal("Couldn't open moduli file \"%s\": %s", 2510 out_file, strerror(errno)); 2511 } 2512 if (prime_test(in, out, trials, generator_wanted, checkpoint, 2513 start_lineno, lines_to_process) != 0) 2514 fatal("modulus screening failed"); 2515 return (0); 2516 } 2517 2518 if (gen_all_hostkeys) { 2519 do_gen_all_hostkeys(pw); 2520 return (0); 2521 } 2522 2523 arc4random_stir(); 2524 2525 if (key_type_name == NULL) 2526 key_type_name = "rsa"; 2527 2528 type = key_type_from_name(key_type_name); 2529 type_bits_valid(type, &bits); 2530 2531 if (!quiet) 2532 printf("Generating public/private %s key pair.\n", key_type_name); 2533 private = key_generate(type, bits); 2534 if (private == NULL) { 2535 fprintf(stderr, "key_generate failed\n"); 2536 exit(1); 2537 } 2538 public = key_from_private(private); 2539 2540 if (!have_identity) 2541 ask_filename(pw, "Enter file in which to save the key"); 2542 2543 /* Create ~/.ssh directory if it doesn't already exist. */ 2544 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2545 pw->pw_dir, _PATH_SSH_USER_DIR); 2546 if (strstr(identity_file, dotsshdir) != NULL) { 2547 if (stat(dotsshdir, &st) < 0) { 2548 if (errno != ENOENT) { 2549 error("Could not stat %s: %s", dotsshdir, 2550 strerror(errno)); 2551 } else if (mkdir(dotsshdir, 0700) < 0) { 2552 error("Could not create directory '%s': %s", 2553 dotsshdir, strerror(errno)); 2554 } else if (!quiet) 2555 printf("Created directory '%s'.\n", dotsshdir); 2556 } 2557 } 2558 /* If the file already exists, ask the user to confirm. */ 2559 if (stat(identity_file, &st) >= 0) { 2560 char yesno[3]; 2561 printf("%s already exists.\n", identity_file); 2562 printf("Overwrite (y/n)? "); 2563 fflush(stdout); 2564 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2565 exit(1); 2566 if (yesno[0] != 'y' && yesno[0] != 'Y') 2567 exit(1); 2568 } 2569 /* Ask for a passphrase (twice). */ 2570 if (identity_passphrase) 2571 passphrase1 = xstrdup(identity_passphrase); 2572 else if (identity_new_passphrase) 2573 passphrase1 = xstrdup(identity_new_passphrase); 2574 else { 2575 passphrase_again: 2576 passphrase1 = 2577 read_passphrase("Enter passphrase (empty for no " 2578 "passphrase): ", RP_ALLOW_STDIN); 2579 passphrase2 = read_passphrase("Enter same passphrase again: ", 2580 RP_ALLOW_STDIN); 2581 if (strcmp(passphrase1, passphrase2) != 0) { 2582 /* 2583 * The passphrases do not match. Clear them and 2584 * retry. 2585 */ 2586 memset(passphrase1, 0, strlen(passphrase1)); 2587 memset(passphrase2, 0, strlen(passphrase2)); 2588 xfree(passphrase1); 2589 xfree(passphrase2); 2590 printf("Passphrases do not match. Try again.\n"); 2591 goto passphrase_again; 2592 } 2593 /* Clear the other copy of the passphrase. */ 2594 memset(passphrase2, 0, strlen(passphrase2)); 2595 xfree(passphrase2); 2596 } 2597 2598 if (identity_comment) { 2599 strlcpy(comment, identity_comment, sizeof(comment)); 2600 } else { 2601 /* Create default comment field for the passphrase. */ 2602 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2603 } 2604 2605 /* Save the key with the given passphrase and comment. */ 2606 if (!key_save_private(private, identity_file, passphrase1, comment)) { 2607 printf("Saving the key failed: %s.\n", identity_file); 2608 memset(passphrase1, 0, strlen(passphrase1)); 2609 xfree(passphrase1); 2610 exit(1); 2611 } 2612 /* Clear the passphrase. */ 2613 memset(passphrase1, 0, strlen(passphrase1)); 2614 xfree(passphrase1); 2615 2616 /* Clear the private key and the random number generator. */ 2617 key_free(private); 2618 arc4random_stir(); 2619 2620 if (!quiet) 2621 printf("Your identification has been saved in %s.\n", identity_file); 2622 2623 strlcat(identity_file, ".pub", sizeof(identity_file)); 2624 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 2625 if (fd == -1) { 2626 printf("Could not save your public key in %s\n", identity_file); 2627 exit(1); 2628 } 2629 f = fdopen(fd, "w"); 2630 if (f == NULL) { 2631 printf("fdopen %s failed\n", identity_file); 2632 exit(1); 2633 } 2634 if (!key_write(public, f)) 2635 fprintf(stderr, "write key failed\n"); 2636 fprintf(f, " %s\n", comment); 2637 fclose(f); 2638 2639 if (!quiet) { 2640 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 2641 char *ra = key_fingerprint(public, SSH_FP_MD5, 2642 SSH_FP_RANDOMART); 2643 printf("Your public key has been saved in %s.\n", 2644 identity_file); 2645 printf("The key fingerprint is:\n"); 2646 printf("%s %s\n", fp, comment); 2647 printf("The key's randomart image is:\n"); 2648 printf("%s\n", ra); 2649 xfree(ra); 2650 xfree(fp); 2651 } 2652 2653 key_free(public); 2654 exit(0); 2655 } 2656