1 /* $OpenBSD: ssh-keygen.c,v 1.243 2014/03/15 17:28:26 deraadt 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 <sys/types.h> 16 #include <sys/socket.h> 17 #include <sys/stat.h> 18 #include <sys/param.h> 19 20 #include <openssl/evp.h> 21 #include <openssl/pem.h> 22 23 #include <errno.h> 24 #include <fcntl.h> 25 #include <pwd.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <unistd.h> 30 31 #include "xmalloc.h" 32 #include "key.h" 33 #include "rsa.h" 34 #include "authfile.h" 35 #include "uuencode.h" 36 #include "buffer.h" 37 #include "pathnames.h" 38 #include "log.h" 39 #include "misc.h" 40 #include "match.h" 41 #include "hostfile.h" 42 #include "dns.h" 43 #include "ssh.h" 44 #include "ssh2.h" 45 #include "atomicio.h" 46 #include "krl.h" 47 48 #ifdef ENABLE_PKCS11 49 #include "ssh-pkcs11.h" 50 #endif 51 52 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */ 53 #define DEFAULT_BITS 2048 54 #define DEFAULT_BITS_DSA 1024 55 #define DEFAULT_BITS_ECDSA 256 56 u_int32_t bits = 0; 57 58 /* 59 * Flag indicating that we just want to change the passphrase. This can be 60 * set on the command line. 61 */ 62 int change_passphrase = 0; 63 64 /* 65 * Flag indicating that we just want to change the comment. This can be set 66 * on the command line. 67 */ 68 int change_comment = 0; 69 70 int quiet = 0; 71 72 int log_level = SYSLOG_LEVEL_INFO; 73 74 /* Flag indicating that we want to hash a known_hosts file */ 75 int hash_hosts = 0; 76 /* Flag indicating that we want lookup a host in known_hosts file */ 77 int find_host = 0; 78 /* Flag indicating that we want to delete a host from a known_hosts file */ 79 int delete_host = 0; 80 81 /* Flag indicating that we want to show the contents of a certificate */ 82 int show_cert = 0; 83 84 /* Flag indicating that we just want to see the key fingerprint */ 85 int print_fingerprint = 0; 86 int print_bubblebabble = 0; 87 88 /* The identity file name, given on the command line or entered by the user. */ 89 char identity_file[1024]; 90 int have_identity = 0; 91 92 /* This is set to the passphrase if given on the command line. */ 93 char *identity_passphrase = NULL; 94 95 /* This is set to the new passphrase if given on the command line. */ 96 char *identity_new_passphrase = NULL; 97 98 /* This is set to the new comment if given on the command line. */ 99 char *identity_comment = NULL; 100 101 /* Path to CA key when certifying keys. */ 102 char *ca_key_path = NULL; 103 104 /* Certificate serial number */ 105 unsigned long long cert_serial = 0; 106 107 /* Key type when certifying */ 108 u_int cert_key_type = SSH2_CERT_TYPE_USER; 109 110 /* "key ID" of signed key */ 111 char *cert_key_id = NULL; 112 113 /* Comma-separated list of principal names for certifying keys */ 114 char *cert_principals = NULL; 115 116 /* Validity period for certificates */ 117 u_int64_t cert_valid_from = 0; 118 u_int64_t cert_valid_to = ~0ULL; 119 120 /* Certificate options */ 121 #define CERTOPT_X_FWD (1) 122 #define CERTOPT_AGENT_FWD (1<<1) 123 #define CERTOPT_PORT_FWD (1<<2) 124 #define CERTOPT_PTY (1<<3) 125 #define CERTOPT_USER_RC (1<<4) 126 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 127 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 128 u_int32_t certflags_flags = CERTOPT_DEFAULT; 129 char *certflags_command = NULL; 130 char *certflags_src_addr = NULL; 131 132 /* Conversion to/from various formats */ 133 int convert_to = 0; 134 int convert_from = 0; 135 enum { 136 FMT_RFC4716, 137 FMT_PKCS8, 138 FMT_PEM 139 } convert_format = FMT_RFC4716; 140 int print_public = 0; 141 int print_generic = 0; 142 143 char *key_type_name = NULL; 144 145 /* Load key from this PKCS#11 provider */ 146 char *pkcs11provider = NULL; 147 148 /* Use new OpenSSH private key format when writing SSH2 keys instead of PEM */ 149 int use_new_format = 0; 150 151 /* Cipher for new-format private keys */ 152 char *new_format_cipher = NULL; 153 154 /* 155 * Number of KDF rounds to derive new format keys / 156 * number of primality trials when screening moduli. 157 */ 158 int rounds = 0; 159 160 /* argv0 */ 161 extern char *__progname; 162 163 char hostname[MAXHOSTNAMELEN]; 164 165 /* moduli.c */ 166 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 167 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 168 unsigned long); 169 170 static void 171 type_bits_valid(int type, u_int32_t *bitsp) 172 { 173 u_int maxbits; 174 175 if (type == KEY_UNSPEC) { 176 fprintf(stderr, "unknown key type %s\n", key_type_name); 177 exit(1); 178 } 179 if (*bitsp == 0) { 180 if (type == KEY_DSA) 181 *bitsp = DEFAULT_BITS_DSA; 182 else if (type == KEY_ECDSA) 183 *bitsp = DEFAULT_BITS_ECDSA; 184 else 185 *bitsp = DEFAULT_BITS; 186 } 187 maxbits = (type == KEY_DSA) ? 188 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 189 if (*bitsp > maxbits) { 190 fprintf(stderr, "key bits exceeds maximum %d\n", maxbits); 191 exit(1); 192 } 193 if (type == KEY_DSA && *bitsp != 1024) 194 fatal("DSA keys must be 1024 bits"); 195 else if (type != KEY_ECDSA && type != KEY_ED25519 && *bitsp < 768) 196 fatal("Key must at least be 768 bits"); 197 else if (type == KEY_ECDSA && key_ecdsa_bits_to_nid(*bitsp) == -1) 198 fatal("Invalid ECDSA key length - valid lengths are " 199 "256, 384 or 521 bits"); 200 } 201 202 static void 203 ask_filename(struct passwd *pw, const char *prompt) 204 { 205 char buf[1024]; 206 char *name = NULL; 207 208 if (key_type_name == NULL) 209 name = _PATH_SSH_CLIENT_ID_RSA; 210 else { 211 switch (key_type_from_name(key_type_name)) { 212 case KEY_RSA1: 213 name = _PATH_SSH_CLIENT_IDENTITY; 214 break; 215 case KEY_DSA_CERT: 216 case KEY_DSA_CERT_V00: 217 case KEY_DSA: 218 name = _PATH_SSH_CLIENT_ID_DSA; 219 break; 220 case KEY_ECDSA_CERT: 221 case KEY_ECDSA: 222 name = _PATH_SSH_CLIENT_ID_ECDSA; 223 break; 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 case KEY_ED25519: 230 case KEY_ED25519_CERT: 231 name = _PATH_SSH_CLIENT_ID_ED25519; 232 break; 233 default: 234 fprintf(stderr, "bad key type\n"); 235 exit(1); 236 break; 237 } 238 } 239 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 240 fprintf(stderr, "%s (%s): ", prompt, identity_file); 241 if (fgets(buf, sizeof(buf), stdin) == NULL) 242 exit(1); 243 buf[strcspn(buf, "\n")] = '\0'; 244 if (strcmp(buf, "") != 0) 245 strlcpy(identity_file, buf, sizeof(identity_file)); 246 have_identity = 1; 247 } 248 249 static Key * 250 load_identity(char *filename) 251 { 252 char *pass; 253 Key *prv; 254 255 prv = key_load_private(filename, "", NULL); 256 if (prv == NULL) { 257 if (identity_passphrase) 258 pass = xstrdup(identity_passphrase); 259 else 260 pass = read_passphrase("Enter passphrase: ", 261 RP_ALLOW_STDIN); 262 prv = key_load_private(filename, pass, NULL); 263 explicit_bzero(pass, strlen(pass)); 264 free(pass); 265 } 266 return prv; 267 } 268 269 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 270 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 271 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 272 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 273 274 static void 275 do_convert_to_ssh2(struct passwd *pw, Key *k) 276 { 277 u_int len; 278 u_char *blob; 279 char comment[61]; 280 281 if (k->type == KEY_RSA1) { 282 fprintf(stderr, "version 1 keys are not supported\n"); 283 exit(1); 284 } 285 if (key_to_blob(k, &blob, &len) <= 0) { 286 fprintf(stderr, "key_to_blob failed\n"); 287 exit(1); 288 } 289 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 290 snprintf(comment, sizeof(comment), 291 "%u-bit %s, converted by %s@%s from OpenSSH", 292 key_size(k), key_type(k), 293 pw->pw_name, hostname); 294 295 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 296 fprintf(stdout, "Comment: \"%s\"\n", comment); 297 dump_base64(stdout, blob, len); 298 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 299 key_free(k); 300 free(blob); 301 exit(0); 302 } 303 304 static void 305 do_convert_to_pkcs8(Key *k) 306 { 307 switch (key_type_plain(k->type)) { 308 case KEY_RSA1: 309 case KEY_RSA: 310 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 311 fatal("PEM_write_RSA_PUBKEY failed"); 312 break; 313 case KEY_DSA: 314 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 315 fatal("PEM_write_DSA_PUBKEY failed"); 316 break; 317 case KEY_ECDSA: 318 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 319 fatal("PEM_write_EC_PUBKEY failed"); 320 break; 321 default: 322 fatal("%s: unsupported key type %s", __func__, key_type(k)); 323 } 324 exit(0); 325 } 326 327 static void 328 do_convert_to_pem(Key *k) 329 { 330 switch (key_type_plain(k->type)) { 331 case KEY_RSA1: 332 case KEY_RSA: 333 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 334 fatal("PEM_write_RSAPublicKey failed"); 335 break; 336 #if notyet /* OpenSSH 0.9.8 lacks this function */ 337 case KEY_DSA: 338 if (!PEM_write_DSAPublicKey(stdout, k->dsa)) 339 fatal("PEM_write_DSAPublicKey failed"); 340 break; 341 #endif 342 /* XXX ECDSA? */ 343 default: 344 fatal("%s: unsupported key type %s", __func__, key_type(k)); 345 } 346 exit(0); 347 } 348 349 static void 350 do_convert_to(struct passwd *pw) 351 { 352 Key *k; 353 struct stat st; 354 355 if (!have_identity) 356 ask_filename(pw, "Enter file in which the key is"); 357 if (stat(identity_file, &st) < 0) 358 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 359 if ((k = key_load_public(identity_file, NULL)) == NULL) { 360 if ((k = load_identity(identity_file)) == NULL) { 361 fprintf(stderr, "load failed\n"); 362 exit(1); 363 } 364 } 365 366 switch (convert_format) { 367 case FMT_RFC4716: 368 do_convert_to_ssh2(pw, k); 369 break; 370 case FMT_PKCS8: 371 do_convert_to_pkcs8(k); 372 break; 373 case FMT_PEM: 374 do_convert_to_pem(k); 375 break; 376 default: 377 fatal("%s: unknown key format %d", __func__, convert_format); 378 } 379 exit(0); 380 } 381 382 static void 383 buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 384 { 385 u_int bignum_bits = buffer_get_int(b); 386 u_int bytes = (bignum_bits + 7) / 8; 387 388 if (buffer_len(b) < bytes) 389 fatal("buffer_get_bignum_bits: input buffer too small: " 390 "need %d have %d", bytes, buffer_len(b)); 391 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL) 392 fatal("buffer_get_bignum_bits: BN_bin2bn failed"); 393 buffer_consume(b, bytes); 394 } 395 396 static Key * 397 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 398 { 399 Buffer b; 400 Key *key = NULL; 401 char *type, *cipher; 402 u_char *sig = NULL, data[] = "abcde12345"; 403 int magic, rlen, ktype, i1, i2, i3, i4; 404 u_int slen; 405 u_long e; 406 407 buffer_init(&b); 408 buffer_append(&b, blob, blen); 409 410 magic = buffer_get_int(&b); 411 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 412 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 413 buffer_free(&b); 414 return NULL; 415 } 416 i1 = buffer_get_int(&b); 417 type = buffer_get_string(&b, NULL); 418 cipher = buffer_get_string(&b, NULL); 419 i2 = buffer_get_int(&b); 420 i3 = buffer_get_int(&b); 421 i4 = buffer_get_int(&b); 422 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 423 if (strcmp(cipher, "none") != 0) { 424 error("unsupported cipher %s", cipher); 425 free(cipher); 426 buffer_free(&b); 427 free(type); 428 return NULL; 429 } 430 free(cipher); 431 432 if (strstr(type, "dsa")) { 433 ktype = KEY_DSA; 434 } else if (strstr(type, "rsa")) { 435 ktype = KEY_RSA; 436 } else { 437 buffer_free(&b); 438 free(type); 439 return NULL; 440 } 441 key = key_new_private(ktype); 442 free(type); 443 444 switch (key->type) { 445 case KEY_DSA: 446 buffer_get_bignum_bits(&b, key->dsa->p); 447 buffer_get_bignum_bits(&b, key->dsa->g); 448 buffer_get_bignum_bits(&b, key->dsa->q); 449 buffer_get_bignum_bits(&b, key->dsa->pub_key); 450 buffer_get_bignum_bits(&b, key->dsa->priv_key); 451 break; 452 case KEY_RSA: 453 e = buffer_get_char(&b); 454 debug("e %lx", e); 455 if (e < 30) { 456 e <<= 8; 457 e += buffer_get_char(&b); 458 debug("e %lx", e); 459 e <<= 8; 460 e += buffer_get_char(&b); 461 debug("e %lx", e); 462 } 463 if (!BN_set_word(key->rsa->e, e)) { 464 buffer_free(&b); 465 key_free(key); 466 return NULL; 467 } 468 buffer_get_bignum_bits(&b, key->rsa->d); 469 buffer_get_bignum_bits(&b, key->rsa->n); 470 buffer_get_bignum_bits(&b, key->rsa->iqmp); 471 buffer_get_bignum_bits(&b, key->rsa->q); 472 buffer_get_bignum_bits(&b, key->rsa->p); 473 rsa_generate_additional_parameters(key->rsa); 474 break; 475 } 476 rlen = buffer_len(&b); 477 if (rlen != 0) 478 error("do_convert_private_ssh2_from_blob: " 479 "remaining bytes in key blob %d", rlen); 480 buffer_free(&b); 481 482 /* try the key */ 483 key_sign(key, &sig, &slen, data, sizeof(data)); 484 key_verify(key, sig, slen, data, sizeof(data)); 485 free(sig); 486 return key; 487 } 488 489 static int 490 get_line(FILE *fp, char *line, size_t len) 491 { 492 int c; 493 size_t pos = 0; 494 495 line[0] = '\0'; 496 while ((c = fgetc(fp)) != EOF) { 497 if (pos >= len - 1) { 498 fprintf(stderr, "input line too long.\n"); 499 exit(1); 500 } 501 switch (c) { 502 case '\r': 503 c = fgetc(fp); 504 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { 505 fprintf(stderr, "unget: %s\n", strerror(errno)); 506 exit(1); 507 } 508 return pos; 509 case '\n': 510 return pos; 511 } 512 line[pos++] = c; 513 line[pos] = '\0'; 514 } 515 /* We reached EOF */ 516 return -1; 517 } 518 519 static void 520 do_convert_from_ssh2(struct passwd *pw, Key **k, int *private) 521 { 522 int blen; 523 u_int len; 524 char line[1024]; 525 u_char blob[8096]; 526 char encoded[8096]; 527 int escaped = 0; 528 FILE *fp; 529 530 if ((fp = fopen(identity_file, "r")) == NULL) 531 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 532 encoded[0] = '\0'; 533 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 534 if (blen > 0 && line[blen - 1] == '\\') 535 escaped++; 536 if (strncmp(line, "----", 4) == 0 || 537 strstr(line, ": ") != NULL) { 538 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 539 *private = 1; 540 if (strstr(line, " END ") != NULL) { 541 break; 542 } 543 /* fprintf(stderr, "ignore: %s", line); */ 544 continue; 545 } 546 if (escaped) { 547 escaped--; 548 /* fprintf(stderr, "escaped: %s", line); */ 549 continue; 550 } 551 strlcat(encoded, line, sizeof(encoded)); 552 } 553 len = strlen(encoded); 554 if (((len % 4) == 3) && 555 (encoded[len-1] == '=') && 556 (encoded[len-2] == '=') && 557 (encoded[len-3] == '=')) 558 encoded[len-3] = '\0'; 559 blen = uudecode(encoded, blob, sizeof(blob)); 560 if (blen < 0) { 561 fprintf(stderr, "uudecode failed.\n"); 562 exit(1); 563 } 564 *k = *private ? 565 do_convert_private_ssh2_from_blob(blob, blen) : 566 key_from_blob(blob, blen); 567 if (*k == NULL) { 568 fprintf(stderr, "decode blob failed.\n"); 569 exit(1); 570 } 571 fclose(fp); 572 } 573 574 static void 575 do_convert_from_pkcs8(Key **k, int *private) 576 { 577 EVP_PKEY *pubkey; 578 FILE *fp; 579 580 if ((fp = fopen(identity_file, "r")) == NULL) 581 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 582 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 583 fatal("%s: %s is not a recognised public key format", __func__, 584 identity_file); 585 } 586 fclose(fp); 587 switch (EVP_PKEY_type(pubkey->type)) { 588 case EVP_PKEY_RSA: 589 *k = key_new(KEY_UNSPEC); 590 (*k)->type = KEY_RSA; 591 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 592 break; 593 case EVP_PKEY_DSA: 594 *k = key_new(KEY_UNSPEC); 595 (*k)->type = KEY_DSA; 596 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 597 break; 598 case EVP_PKEY_EC: 599 *k = key_new(KEY_UNSPEC); 600 (*k)->type = KEY_ECDSA; 601 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 602 (*k)->ecdsa_nid = key_ecdsa_key_to_nid((*k)->ecdsa); 603 break; 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 } 611 612 static void 613 do_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 } 643 644 static void 645 do_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 case KEY_ECDSA: 681 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 682 NULL, 0, NULL, NULL); 683 break; 684 case KEY_RSA: 685 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 686 NULL, 0, NULL, NULL); 687 break; 688 default: 689 fatal("%s: unsupported key type %s", __func__, 690 key_type(k)); 691 } 692 } 693 694 if (!ok) { 695 fprintf(stderr, "key write failed\n"); 696 exit(1); 697 } 698 key_free(k); 699 exit(0); 700 } 701 702 static void 703 do_print_public(struct passwd *pw) 704 { 705 Key *prv; 706 struct stat st; 707 708 if (!have_identity) 709 ask_filename(pw, "Enter file in which the key is"); 710 if (stat(identity_file, &st) < 0) { 711 perror(identity_file); 712 exit(1); 713 } 714 prv = load_identity(identity_file); 715 if (prv == NULL) { 716 fprintf(stderr, "load failed\n"); 717 exit(1); 718 } 719 if (!key_write(prv, stdout)) 720 fprintf(stderr, "key_write failed"); 721 key_free(prv); 722 fprintf(stdout, "\n"); 723 exit(0); 724 } 725 726 static void 727 do_download(struct passwd *pw) 728 { 729 #ifdef ENABLE_PKCS11 730 Key **keys = NULL; 731 int i, nkeys; 732 enum fp_rep rep; 733 enum fp_type fptype; 734 char *fp, *ra; 735 736 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 737 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 738 739 pkcs11_init(0); 740 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 741 if (nkeys <= 0) 742 fatal("cannot read public key from pkcs11"); 743 for (i = 0; i < nkeys; i++) { 744 if (print_fingerprint) { 745 fp = key_fingerprint(keys[i], fptype, rep); 746 ra = key_fingerprint(keys[i], SSH_FP_MD5, 747 SSH_FP_RANDOMART); 748 printf("%u %s %s (PKCS11 key)\n", key_size(keys[i]), 749 fp, key_type(keys[i])); 750 if (log_level >= SYSLOG_LEVEL_VERBOSE) 751 printf("%s\n", ra); 752 free(ra); 753 free(fp); 754 } else { 755 key_write(keys[i], stdout); 756 fprintf(stdout, "\n"); 757 } 758 key_free(keys[i]); 759 } 760 free(keys); 761 pkcs11_terminate(); 762 exit(0); 763 #else 764 fatal("no pkcs11 support"); 765 #endif /* ENABLE_PKCS11 */ 766 } 767 768 static void 769 do_fingerprint(struct passwd *pw) 770 { 771 FILE *f; 772 Key *public; 773 char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra; 774 int i, skip = 0, num = 0, invalid = 1; 775 enum fp_rep rep; 776 enum fp_type fptype; 777 struct stat st; 778 779 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 780 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 781 782 if (!have_identity) 783 ask_filename(pw, "Enter file in which the key is"); 784 if (stat(identity_file, &st) < 0) { 785 perror(identity_file); 786 exit(1); 787 } 788 public = key_load_public(identity_file, &comment); 789 if (public != NULL) { 790 fp = key_fingerprint(public, fptype, rep); 791 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 792 printf("%u %s %s (%s)\n", key_size(public), fp, comment, 793 key_type(public)); 794 if (log_level >= SYSLOG_LEVEL_VERBOSE) 795 printf("%s\n", ra); 796 key_free(public); 797 free(comment); 798 free(ra); 799 free(fp); 800 exit(0); 801 } 802 if (comment) { 803 free(comment); 804 comment = NULL; 805 } 806 807 if ((f = fopen(identity_file, "r")) == NULL) 808 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 809 810 while (fgets(line, sizeof(line), f)) { 811 if ((cp = strchr(line, '\n')) == NULL) { 812 error("line %d too long: %.40s...", 813 num + 1, line); 814 skip = 1; 815 continue; 816 } 817 num++; 818 if (skip) { 819 skip = 0; 820 continue; 821 } 822 *cp = '\0'; 823 824 /* Skip leading whitespace, empty and comment lines. */ 825 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 826 ; 827 if (!*cp || *cp == '\n' || *cp == '#') 828 continue; 829 i = strtol(cp, &ep, 10); 830 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 831 int quoted = 0; 832 comment = cp; 833 for (; *cp && (quoted || (*cp != ' ' && 834 *cp != '\t')); cp++) { 835 if (*cp == '\\' && cp[1] == '"') 836 cp++; /* Skip both */ 837 else if (*cp == '"') 838 quoted = !quoted; 839 } 840 if (!*cp) 841 continue; 842 *cp++ = '\0'; 843 } 844 ep = cp; 845 public = key_new(KEY_RSA1); 846 if (key_read(public, &cp) != 1) { 847 cp = ep; 848 key_free(public); 849 public = key_new(KEY_UNSPEC); 850 if (key_read(public, &cp) != 1) { 851 key_free(public); 852 continue; 853 } 854 } 855 comment = *cp ? cp : comment; 856 fp = key_fingerprint(public, fptype, rep); 857 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 858 printf("%u %s %s (%s)\n", key_size(public), fp, 859 comment ? comment : "no comment", key_type(public)); 860 if (log_level >= SYSLOG_LEVEL_VERBOSE) 861 printf("%s\n", ra); 862 free(ra); 863 free(fp); 864 key_free(public); 865 invalid = 0; 866 } 867 fclose(f); 868 869 if (invalid) { 870 printf("%s is not a public key file.\n", identity_file); 871 exit(1); 872 } 873 exit(0); 874 } 875 876 static void 877 do_gen_all_hostkeys(struct passwd *pw) 878 { 879 struct { 880 char *key_type; 881 char *key_type_display; 882 char *path; 883 } key_types[] = { 884 { "rsa1", "RSA1", _PATH_HOST_KEY_FILE }, 885 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 886 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 887 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 888 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE }, 889 { NULL, NULL, NULL } 890 }; 891 892 int first = 0; 893 struct stat st; 894 Key *private, *public; 895 char comment[1024]; 896 int i, type, fd; 897 FILE *f; 898 899 for (i = 0; key_types[i].key_type; i++) { 900 if (stat(key_types[i].path, &st) == 0) 901 continue; 902 if (errno != ENOENT) { 903 printf("Could not stat %s: %s", key_types[i].path, 904 strerror(errno)); 905 first = 0; 906 continue; 907 } 908 909 if (first == 0) { 910 first = 1; 911 printf("%s: generating new host keys: ", __progname); 912 } 913 printf("%s ", key_types[i].key_type_display); 914 fflush(stdout); 915 type = key_type_from_name(key_types[i].key_type); 916 strlcpy(identity_file, key_types[i].path, sizeof(identity_file)); 917 bits = 0; 918 type_bits_valid(type, &bits); 919 private = key_generate(type, bits); 920 if (private == NULL) { 921 fprintf(stderr, "key_generate failed\n"); 922 first = 0; 923 continue; 924 } 925 public = key_from_private(private); 926 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 927 hostname); 928 if (!key_save_private(private, identity_file, "", comment, 929 use_new_format, new_format_cipher, rounds)) { 930 printf("Saving the key failed: %s.\n", identity_file); 931 key_free(private); 932 key_free(public); 933 first = 0; 934 continue; 935 } 936 key_free(private); 937 strlcat(identity_file, ".pub", sizeof(identity_file)); 938 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 939 if (fd == -1) { 940 printf("Could not save your public key in %s\n", 941 identity_file); 942 key_free(public); 943 first = 0; 944 continue; 945 } 946 f = fdopen(fd, "w"); 947 if (f == NULL) { 948 printf("fdopen %s failed\n", identity_file); 949 key_free(public); 950 first = 0; 951 continue; 952 } 953 if (!key_write(public, f)) { 954 fprintf(stderr, "write key failed\n"); 955 key_free(public); 956 first = 0; 957 continue; 958 } 959 fprintf(f, " %s\n", comment); 960 fclose(f); 961 key_free(public); 962 963 } 964 if (first != 0) 965 printf("\n"); 966 } 967 968 static void 969 printhost(FILE *f, const char *name, Key *public, int ca, int hash) 970 { 971 if (print_fingerprint) { 972 enum fp_rep rep; 973 enum fp_type fptype; 974 char *fp, *ra; 975 976 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 977 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 978 fp = key_fingerprint(public, fptype, rep); 979 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 980 printf("%u %s %s (%s)\n", key_size(public), fp, name, 981 key_type(public)); 982 if (log_level >= SYSLOG_LEVEL_VERBOSE) 983 printf("%s\n", ra); 984 free(ra); 985 free(fp); 986 } else { 987 if (hash && (name = host_hash(name, NULL, 0)) == NULL) 988 fatal("hash_host failed"); 989 fprintf(f, "%s%s%s ", ca ? CA_MARKER : "", ca ? " " : "", name); 990 if (!key_write(public, f)) 991 fatal("key_write failed"); 992 fprintf(f, "\n"); 993 } 994 } 995 996 static void 997 do_known_hosts(struct passwd *pw, const char *name) 998 { 999 FILE *in, *out = stdout; 1000 Key *pub; 1001 char *cp, *cp2, *kp, *kp2; 1002 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; 1003 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; 1004 int ca; 1005 int found_key = 0; 1006 1007 if (!have_identity) { 1008 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1009 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1010 sizeof(identity_file)) 1011 fatal("Specified known hosts path too long"); 1012 free(cp); 1013 have_identity = 1; 1014 } 1015 if ((in = fopen(identity_file, "r")) == NULL) 1016 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1017 1018 /* 1019 * Find hosts goes to stdout, hash and deletions happen in-place 1020 * A corner case is ssh-keygen -HF foo, which should go to stdout 1021 */ 1022 if (!find_host && (hash_hosts || delete_host)) { 1023 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1024 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1025 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1026 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1027 fatal("known_hosts path too long"); 1028 umask(077); 1029 if ((c = mkstemp(tmp)) == -1) 1030 fatal("mkstemp: %s", strerror(errno)); 1031 if ((out = fdopen(c, "w")) == NULL) { 1032 c = errno; 1033 unlink(tmp); 1034 fatal("fdopen: %s", strerror(c)); 1035 } 1036 inplace = 1; 1037 } 1038 1039 while (fgets(line, sizeof(line), in)) { 1040 if ((cp = strchr(line, '\n')) == NULL) { 1041 error("line %d too long: %.40s...", num + 1, line); 1042 skip = 1; 1043 invalid = 1; 1044 continue; 1045 } 1046 num++; 1047 if (skip) { 1048 skip = 0; 1049 continue; 1050 } 1051 *cp = '\0'; 1052 1053 /* Skip leading whitespace, empty and comment lines. */ 1054 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 1055 ; 1056 if (!*cp || *cp == '\n' || *cp == '#') { 1057 if (inplace) 1058 fprintf(out, "%s\n", cp); 1059 continue; 1060 } 1061 /* Check whether this is a CA key */ 1062 if (strncasecmp(cp, CA_MARKER, sizeof(CA_MARKER) - 1) == 0 && 1063 (cp[sizeof(CA_MARKER) - 1] == ' ' || 1064 cp[sizeof(CA_MARKER) - 1] == '\t')) { 1065 ca = 1; 1066 cp += sizeof(CA_MARKER); 1067 } else 1068 ca = 0; 1069 1070 /* Find the end of the host name portion. */ 1071 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) 1072 ; 1073 1074 if (*kp == '\0' || *(kp + 1) == '\0') { 1075 error("line %d missing key: %.40s...", 1076 num, line); 1077 invalid = 1; 1078 continue; 1079 } 1080 *kp++ = '\0'; 1081 kp2 = kp; 1082 1083 pub = key_new(KEY_RSA1); 1084 if (key_read(pub, &kp) != 1) { 1085 kp = kp2; 1086 key_free(pub); 1087 pub = key_new(KEY_UNSPEC); 1088 if (key_read(pub, &kp) != 1) { 1089 error("line %d invalid key: %.40s...", 1090 num, line); 1091 key_free(pub); 1092 invalid = 1; 1093 continue; 1094 } 1095 } 1096 1097 if (*cp == HASH_DELIM) { 1098 if (find_host || delete_host) { 1099 cp2 = host_hash(name, cp, strlen(cp)); 1100 if (cp2 == NULL) { 1101 error("line %d: invalid hashed " 1102 "name: %.64s...", num, line); 1103 invalid = 1; 1104 continue; 1105 } 1106 c = (strcmp(cp2, cp) == 0); 1107 if (find_host && c) { 1108 if (!quiet) 1109 printf("# Host %s found: " 1110 "line %d type %s%s\n", name, 1111 num, key_type(pub), 1112 ca ? " (CA key)" : ""); 1113 printhost(out, cp, pub, ca, 0); 1114 found_key = 1; 1115 } 1116 if (delete_host) { 1117 if (!c && !ca) 1118 printhost(out, cp, pub, ca, 0); 1119 else 1120 printf("# Host %s found: " 1121 "line %d type %s\n", name, 1122 num, key_type(pub)); 1123 } 1124 } else if (hash_hosts) 1125 printhost(out, cp, pub, ca, 0); 1126 } else { 1127 if (find_host || delete_host) { 1128 c = (match_hostname(name, cp, 1129 strlen(cp)) == 1); 1130 if (find_host && c) { 1131 if (!quiet) 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 found_key = 1; 1139 } 1140 if (delete_host) { 1141 if (!c && !ca) 1142 printhost(out, cp, pub, ca, 0); 1143 else 1144 printf("# Host %s found: " 1145 "line %d type %s\n", name, 1146 num, key_type(pub)); 1147 } 1148 } else if (hash_hosts) { 1149 for (cp2 = strsep(&cp, ","); 1150 cp2 != NULL && *cp2 != '\0'; 1151 cp2 = strsep(&cp, ",")) { 1152 if (ca) { 1153 fprintf(stderr, "Warning: " 1154 "ignoring CA key for host: " 1155 "%.64s\n", cp2); 1156 printhost(out, cp2, pub, ca, 0); 1157 } else if (strcspn(cp2, "*?!") != 1158 strlen(cp2)) { 1159 fprintf(stderr, "Warning: " 1160 "ignoring host name with " 1161 "metacharacters: %.64s\n", 1162 cp2); 1163 printhost(out, cp2, pub, ca, 0); 1164 } else 1165 printhost(out, cp2, pub, ca, 1); 1166 } 1167 has_unhashed = 1; 1168 } 1169 } 1170 key_free(pub); 1171 } 1172 fclose(in); 1173 1174 if (invalid) { 1175 fprintf(stderr, "%s is not a valid known_hosts file.\n", 1176 identity_file); 1177 if (inplace) { 1178 fprintf(stderr, "Not replacing existing known_hosts " 1179 "file because of errors\n"); 1180 fclose(out); 1181 unlink(tmp); 1182 } 1183 exit(1); 1184 } 1185 1186 if (inplace) { 1187 fclose(out); 1188 1189 /* Backup existing file */ 1190 if (unlink(old) == -1 && errno != ENOENT) 1191 fatal("unlink %.100s: %s", old, strerror(errno)); 1192 if (link(identity_file, old) == -1) 1193 fatal("link %.100s to %.100s: %s", identity_file, old, 1194 strerror(errno)); 1195 /* Move new one into place */ 1196 if (rename(tmp, identity_file) == -1) { 1197 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1198 strerror(errno)); 1199 unlink(tmp); 1200 unlink(old); 1201 exit(1); 1202 } 1203 1204 fprintf(stderr, "%s updated.\n", identity_file); 1205 fprintf(stderr, "Original contents retained as %s\n", old); 1206 if (has_unhashed) { 1207 fprintf(stderr, "WARNING: %s contains unhashed " 1208 "entries\n", old); 1209 fprintf(stderr, "Delete this file to ensure privacy " 1210 "of hostnames\n"); 1211 } 1212 } 1213 1214 exit (find_host && !found_key); 1215 } 1216 1217 /* 1218 * Perform changing a passphrase. The argument is the passwd structure 1219 * for the current user. 1220 */ 1221 static void 1222 do_change_passphrase(struct passwd *pw) 1223 { 1224 char *comment; 1225 char *old_passphrase, *passphrase1, *passphrase2; 1226 struct stat st; 1227 Key *private; 1228 1229 if (!have_identity) 1230 ask_filename(pw, "Enter file in which the key is"); 1231 if (stat(identity_file, &st) < 0) { 1232 perror(identity_file); 1233 exit(1); 1234 } 1235 /* Try to load the file with empty passphrase. */ 1236 private = key_load_private(identity_file, "", &comment); 1237 if (private == NULL) { 1238 if (identity_passphrase) 1239 old_passphrase = xstrdup(identity_passphrase); 1240 else 1241 old_passphrase = 1242 read_passphrase("Enter old passphrase: ", 1243 RP_ALLOW_STDIN); 1244 private = key_load_private(identity_file, old_passphrase, 1245 &comment); 1246 explicit_bzero(old_passphrase, strlen(old_passphrase)); 1247 free(old_passphrase); 1248 if (private == NULL) { 1249 printf("Bad passphrase.\n"); 1250 exit(1); 1251 } 1252 } 1253 printf("Key has comment '%s'\n", comment); 1254 1255 /* Ask the new passphrase (twice). */ 1256 if (identity_new_passphrase) { 1257 passphrase1 = xstrdup(identity_new_passphrase); 1258 passphrase2 = NULL; 1259 } else { 1260 passphrase1 = 1261 read_passphrase("Enter new passphrase (empty for no " 1262 "passphrase): ", RP_ALLOW_STDIN); 1263 passphrase2 = read_passphrase("Enter same passphrase again: ", 1264 RP_ALLOW_STDIN); 1265 1266 /* Verify that they are the same. */ 1267 if (strcmp(passphrase1, passphrase2) != 0) { 1268 explicit_bzero(passphrase1, strlen(passphrase1)); 1269 explicit_bzero(passphrase2, strlen(passphrase2)); 1270 free(passphrase1); 1271 free(passphrase2); 1272 printf("Pass phrases do not match. Try again.\n"); 1273 exit(1); 1274 } 1275 /* Destroy the other copy. */ 1276 explicit_bzero(passphrase2, strlen(passphrase2)); 1277 free(passphrase2); 1278 } 1279 1280 /* Save the file using the new passphrase. */ 1281 if (!key_save_private(private, identity_file, passphrase1, comment, 1282 use_new_format, new_format_cipher, rounds)) { 1283 printf("Saving the key failed: %s.\n", identity_file); 1284 explicit_bzero(passphrase1, strlen(passphrase1)); 1285 free(passphrase1); 1286 key_free(private); 1287 free(comment); 1288 exit(1); 1289 } 1290 /* Destroy the passphrase and the copy of the key in memory. */ 1291 explicit_bzero(passphrase1, strlen(passphrase1)); 1292 free(passphrase1); 1293 key_free(private); /* Destroys contents */ 1294 free(comment); 1295 1296 printf("Your identification has been saved with the new passphrase.\n"); 1297 exit(0); 1298 } 1299 1300 /* 1301 * Print the SSHFP RR. 1302 */ 1303 static int 1304 do_print_resource_record(struct passwd *pw, char *fname, char *hname) 1305 { 1306 Key *public; 1307 char *comment = NULL; 1308 struct stat st; 1309 1310 if (fname == NULL) 1311 fatal("%s: no filename", __func__); 1312 if (stat(fname, &st) < 0) { 1313 if (errno == ENOENT) 1314 return 0; 1315 perror(fname); 1316 exit(1); 1317 } 1318 public = key_load_public(fname, &comment); 1319 if (public != NULL) { 1320 export_dns_rr(hname, public, stdout, print_generic); 1321 key_free(public); 1322 free(comment); 1323 return 1; 1324 } 1325 if (comment) 1326 free(comment); 1327 1328 printf("failed to read v2 public key from %s.\n", fname); 1329 exit(1); 1330 } 1331 1332 /* 1333 * Change the comment of a private key file. 1334 */ 1335 static void 1336 do_change_comment(struct passwd *pw) 1337 { 1338 char new_comment[1024], *comment, *passphrase; 1339 Key *private; 1340 Key *public; 1341 struct stat st; 1342 FILE *f; 1343 int fd; 1344 1345 if (!have_identity) 1346 ask_filename(pw, "Enter file in which the key is"); 1347 if (stat(identity_file, &st) < 0) { 1348 perror(identity_file); 1349 exit(1); 1350 } 1351 private = key_load_private(identity_file, "", &comment); 1352 if (private == NULL) { 1353 if (identity_passphrase) 1354 passphrase = xstrdup(identity_passphrase); 1355 else if (identity_new_passphrase) 1356 passphrase = xstrdup(identity_new_passphrase); 1357 else 1358 passphrase = read_passphrase("Enter passphrase: ", 1359 RP_ALLOW_STDIN); 1360 /* Try to load using the passphrase. */ 1361 private = key_load_private(identity_file, passphrase, &comment); 1362 if (private == NULL) { 1363 explicit_bzero(passphrase, strlen(passphrase)); 1364 free(passphrase); 1365 printf("Bad passphrase.\n"); 1366 exit(1); 1367 } 1368 } else { 1369 passphrase = xstrdup(""); 1370 } 1371 if (private->type != KEY_RSA1) { 1372 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 1373 key_free(private); 1374 exit(1); 1375 } 1376 printf("Key now has comment '%s'\n", comment); 1377 1378 if (identity_comment) { 1379 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1380 } else { 1381 printf("Enter new comment: "); 1382 fflush(stdout); 1383 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1384 explicit_bzero(passphrase, strlen(passphrase)); 1385 key_free(private); 1386 exit(1); 1387 } 1388 new_comment[strcspn(new_comment, "\n")] = '\0'; 1389 } 1390 1391 /* Save the file using the new passphrase. */ 1392 if (!key_save_private(private, identity_file, passphrase, new_comment, 1393 use_new_format, new_format_cipher, rounds)) { 1394 printf("Saving the key failed: %s.\n", identity_file); 1395 explicit_bzero(passphrase, strlen(passphrase)); 1396 free(passphrase); 1397 key_free(private); 1398 free(comment); 1399 exit(1); 1400 } 1401 explicit_bzero(passphrase, strlen(passphrase)); 1402 free(passphrase); 1403 public = key_from_private(private); 1404 key_free(private); 1405 1406 strlcat(identity_file, ".pub", sizeof(identity_file)); 1407 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1408 if (fd == -1) { 1409 printf("Could not save your public key in %s\n", identity_file); 1410 exit(1); 1411 } 1412 f = fdopen(fd, "w"); 1413 if (f == NULL) { 1414 printf("fdopen %s failed\n", identity_file); 1415 exit(1); 1416 } 1417 if (!key_write(public, f)) 1418 fprintf(stderr, "write key failed\n"); 1419 key_free(public); 1420 fprintf(f, " %s\n", new_comment); 1421 fclose(f); 1422 1423 free(comment); 1424 1425 printf("The comment in your key file has been changed.\n"); 1426 exit(0); 1427 } 1428 1429 static const char * 1430 fmt_validity(u_int64_t valid_from, u_int64_t valid_to) 1431 { 1432 char from[32], to[32]; 1433 static char ret[64]; 1434 time_t tt; 1435 struct tm *tm; 1436 1437 *from = *to = '\0'; 1438 if (valid_from == 0 && valid_to == 0xffffffffffffffffULL) 1439 return "forever"; 1440 1441 if (valid_from != 0) { 1442 /* XXX revisit INT_MAX in 2038 :) */ 1443 tt = valid_from > INT_MAX ? INT_MAX : valid_from; 1444 tm = localtime(&tt); 1445 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); 1446 } 1447 if (valid_to != 0xffffffffffffffffULL) { 1448 /* XXX revisit INT_MAX in 2038 :) */ 1449 tt = valid_to > INT_MAX ? INT_MAX : valid_to; 1450 tm = localtime(&tt); 1451 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); 1452 } 1453 1454 if (valid_from == 0) { 1455 snprintf(ret, sizeof(ret), "before %s", to); 1456 return ret; 1457 } 1458 if (valid_to == 0xffffffffffffffffULL) { 1459 snprintf(ret, sizeof(ret), "after %s", from); 1460 return ret; 1461 } 1462 1463 snprintf(ret, sizeof(ret), "from %s to %s", from, to); 1464 return ret; 1465 } 1466 1467 static void 1468 add_flag_option(Buffer *c, const char *name) 1469 { 1470 debug3("%s: %s", __func__, name); 1471 buffer_put_cstring(c, name); 1472 buffer_put_string(c, NULL, 0); 1473 } 1474 1475 static void 1476 add_string_option(Buffer *c, const char *name, const char *value) 1477 { 1478 Buffer b; 1479 1480 debug3("%s: %s=%s", __func__, name, value); 1481 buffer_init(&b); 1482 buffer_put_cstring(&b, value); 1483 1484 buffer_put_cstring(c, name); 1485 buffer_put_string(c, buffer_ptr(&b), buffer_len(&b)); 1486 1487 buffer_free(&b); 1488 } 1489 1490 #define OPTIONS_CRITICAL 1 1491 #define OPTIONS_EXTENSIONS 2 1492 static void 1493 prepare_options_buf(Buffer *c, int which) 1494 { 1495 buffer_clear(c); 1496 if ((which & OPTIONS_CRITICAL) != 0 && 1497 certflags_command != NULL) 1498 add_string_option(c, "force-command", certflags_command); 1499 if ((which & OPTIONS_EXTENSIONS) != 0 && 1500 (certflags_flags & CERTOPT_X_FWD) != 0) 1501 add_flag_option(c, "permit-X11-forwarding"); 1502 if ((which & OPTIONS_EXTENSIONS) != 0 && 1503 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1504 add_flag_option(c, "permit-agent-forwarding"); 1505 if ((which & OPTIONS_EXTENSIONS) != 0 && 1506 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1507 add_flag_option(c, "permit-port-forwarding"); 1508 if ((which & OPTIONS_EXTENSIONS) != 0 && 1509 (certflags_flags & CERTOPT_PTY) != 0) 1510 add_flag_option(c, "permit-pty"); 1511 if ((which & OPTIONS_EXTENSIONS) != 0 && 1512 (certflags_flags & CERTOPT_USER_RC) != 0) 1513 add_flag_option(c, "permit-user-rc"); 1514 if ((which & OPTIONS_CRITICAL) != 0 && 1515 certflags_src_addr != NULL) 1516 add_string_option(c, "source-address", certflags_src_addr); 1517 } 1518 1519 static Key * 1520 load_pkcs11_key(char *path) 1521 { 1522 #ifdef ENABLE_PKCS11 1523 Key **keys = NULL, *public, *private = NULL; 1524 int i, nkeys; 1525 1526 if ((public = key_load_public(path, NULL)) == NULL) 1527 fatal("Couldn't load CA public key \"%s\"", path); 1528 1529 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1530 debug3("%s: %d keys", __func__, nkeys); 1531 if (nkeys <= 0) 1532 fatal("cannot read public key from pkcs11"); 1533 for (i = 0; i < nkeys; i++) { 1534 if (key_equal_public(public, keys[i])) { 1535 private = keys[i]; 1536 continue; 1537 } 1538 key_free(keys[i]); 1539 } 1540 free(keys); 1541 key_free(public); 1542 return private; 1543 #else 1544 fatal("no pkcs11 support"); 1545 #endif /* ENABLE_PKCS11 */ 1546 } 1547 1548 static void 1549 do_ca_sign(struct passwd *pw, int argc, char **argv) 1550 { 1551 int i, fd; 1552 u_int n; 1553 Key *ca, *public; 1554 char *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1555 FILE *f; 1556 int v00 = 0; /* legacy keys */ 1557 1558 if (key_type_name != NULL) { 1559 switch (key_type_from_name(key_type_name)) { 1560 case KEY_RSA_CERT_V00: 1561 case KEY_DSA_CERT_V00: 1562 v00 = 1; 1563 break; 1564 case KEY_UNSPEC: 1565 if (strcasecmp(key_type_name, "v00") == 0) { 1566 v00 = 1; 1567 break; 1568 } else if (strcasecmp(key_type_name, "v01") == 0) 1569 break; 1570 /* FALLTHROUGH */ 1571 default: 1572 fprintf(stderr, "unknown key type %s\n", key_type_name); 1573 exit(1); 1574 } 1575 } 1576 1577 pkcs11_init(1); 1578 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1579 if (pkcs11provider != NULL) { 1580 if ((ca = load_pkcs11_key(tmp)) == NULL) 1581 fatal("No PKCS#11 key matching %s found", ca_key_path); 1582 } else if ((ca = load_identity(tmp)) == NULL) 1583 fatal("Couldn't load CA key \"%s\"", tmp); 1584 free(tmp); 1585 1586 for (i = 0; i < argc; i++) { 1587 /* Split list of principals */ 1588 n = 0; 1589 if (cert_principals != NULL) { 1590 otmp = tmp = xstrdup(cert_principals); 1591 plist = NULL; 1592 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1593 plist = xrealloc(plist, n + 1, sizeof(*plist)); 1594 if (*(plist[n] = xstrdup(cp)) == '\0') 1595 fatal("Empty principal name"); 1596 } 1597 free(otmp); 1598 } 1599 1600 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1601 if ((public = key_load_public(tmp, &comment)) == NULL) 1602 fatal("%s: unable to open \"%s\"", __func__, tmp); 1603 if (public->type != KEY_RSA && public->type != KEY_DSA && 1604 public->type != KEY_ECDSA && public->type != KEY_ED25519) 1605 fatal("%s: key \"%s\" type %s cannot be certified", 1606 __func__, tmp, key_type(public)); 1607 1608 /* Prepare certificate to sign */ 1609 if (key_to_certified(public, v00) != 0) 1610 fatal("Could not upgrade key %s to certificate", tmp); 1611 public->cert->type = cert_key_type; 1612 public->cert->serial = (u_int64_t)cert_serial; 1613 public->cert->key_id = xstrdup(cert_key_id); 1614 public->cert->nprincipals = n; 1615 public->cert->principals = plist; 1616 public->cert->valid_after = cert_valid_from; 1617 public->cert->valid_before = cert_valid_to; 1618 if (v00) { 1619 prepare_options_buf(&public->cert->critical, 1620 OPTIONS_CRITICAL|OPTIONS_EXTENSIONS); 1621 } else { 1622 prepare_options_buf(&public->cert->critical, 1623 OPTIONS_CRITICAL); 1624 prepare_options_buf(&public->cert->extensions, 1625 OPTIONS_EXTENSIONS); 1626 } 1627 public->cert->signature_key = key_from_private(ca); 1628 1629 if (key_certify(public, ca) != 0) 1630 fatal("Couldn't not certify key %s", tmp); 1631 1632 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1633 *cp = '\0'; 1634 xasprintf(&out, "%s-cert.pub", tmp); 1635 free(tmp); 1636 1637 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1638 fatal("Could not open \"%s\" for writing: %s", out, 1639 strerror(errno)); 1640 if ((f = fdopen(fd, "w")) == NULL) 1641 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1642 if (!key_write(public, f)) 1643 fatal("Could not write certified key to %s", out); 1644 fprintf(f, " %s\n", comment); 1645 fclose(f); 1646 1647 if (!quiet) { 1648 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1649 "valid %s", key_cert_type(public), 1650 out, public->cert->key_id, 1651 (unsigned long long)public->cert->serial, 1652 cert_principals != NULL ? " for " : "", 1653 cert_principals != NULL ? cert_principals : "", 1654 fmt_validity(cert_valid_from, cert_valid_to)); 1655 } 1656 1657 key_free(public); 1658 free(out); 1659 } 1660 pkcs11_terminate(); 1661 exit(0); 1662 } 1663 1664 static u_int64_t 1665 parse_relative_time(const char *s, time_t now) 1666 { 1667 int64_t mul, secs; 1668 1669 mul = *s == '-' ? -1 : 1; 1670 1671 if ((secs = convtime(s + 1)) == -1) 1672 fatal("Invalid relative certificate time %s", s); 1673 if (mul == -1 && secs > now) 1674 fatal("Certificate time %s cannot be represented", s); 1675 return now + (u_int64_t)(secs * mul); 1676 } 1677 1678 static u_int64_t 1679 parse_absolute_time(const char *s) 1680 { 1681 struct tm tm; 1682 time_t tt; 1683 char buf[32], *fmt; 1684 1685 /* 1686 * POSIX strptime says "The application shall ensure that there 1687 * is white-space or other non-alphanumeric characters between 1688 * any two conversion specifications" so arrange things this way. 1689 */ 1690 switch (strlen(s)) { 1691 case 8: 1692 fmt = "%Y-%m-%d"; 1693 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1694 break; 1695 case 14: 1696 fmt = "%Y-%m-%dT%H:%M:%S"; 1697 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1698 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1699 break; 1700 default: 1701 fatal("Invalid certificate time format %s", s); 1702 } 1703 1704 memset(&tm, 0, sizeof(tm)); 1705 if (strptime(buf, fmt, &tm) == NULL) 1706 fatal("Invalid certificate time %s", s); 1707 if ((tt = mktime(&tm)) < 0) 1708 fatal("Certificate time %s cannot be represented", s); 1709 return (u_int64_t)tt; 1710 } 1711 1712 static void 1713 parse_cert_times(char *timespec) 1714 { 1715 char *from, *to; 1716 time_t now = time(NULL); 1717 int64_t secs; 1718 1719 /* +timespec relative to now */ 1720 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1721 if ((secs = convtime(timespec + 1)) == -1) 1722 fatal("Invalid relative certificate life %s", timespec); 1723 cert_valid_to = now + secs; 1724 /* 1725 * Backdate certificate one minute to avoid problems on hosts 1726 * with poorly-synchronised clocks. 1727 */ 1728 cert_valid_from = ((now - 59)/ 60) * 60; 1729 return; 1730 } 1731 1732 /* 1733 * from:to, where 1734 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1735 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1736 */ 1737 from = xstrdup(timespec); 1738 to = strchr(from, ':'); 1739 if (to == NULL || from == to || *(to + 1) == '\0') 1740 fatal("Invalid certificate life specification %s", timespec); 1741 *to++ = '\0'; 1742 1743 if (*from == '-' || *from == '+') 1744 cert_valid_from = parse_relative_time(from, now); 1745 else 1746 cert_valid_from = parse_absolute_time(from); 1747 1748 if (*to == '-' || *to == '+') 1749 cert_valid_to = parse_relative_time(to, now); 1750 else 1751 cert_valid_to = parse_absolute_time(to); 1752 1753 if (cert_valid_to <= cert_valid_from) 1754 fatal("Empty certificate validity interval"); 1755 free(from); 1756 } 1757 1758 static void 1759 add_cert_option(char *opt) 1760 { 1761 char *val; 1762 1763 if (strcasecmp(opt, "clear") == 0) 1764 certflags_flags = 0; 1765 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1766 certflags_flags &= ~CERTOPT_X_FWD; 1767 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1768 certflags_flags |= CERTOPT_X_FWD; 1769 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1770 certflags_flags &= ~CERTOPT_AGENT_FWD; 1771 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1772 certflags_flags |= CERTOPT_AGENT_FWD; 1773 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1774 certflags_flags &= ~CERTOPT_PORT_FWD; 1775 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1776 certflags_flags |= CERTOPT_PORT_FWD; 1777 else if (strcasecmp(opt, "no-pty") == 0) 1778 certflags_flags &= ~CERTOPT_PTY; 1779 else if (strcasecmp(opt, "permit-pty") == 0) 1780 certflags_flags |= CERTOPT_PTY; 1781 else if (strcasecmp(opt, "no-user-rc") == 0) 1782 certflags_flags &= ~CERTOPT_USER_RC; 1783 else if (strcasecmp(opt, "permit-user-rc") == 0) 1784 certflags_flags |= CERTOPT_USER_RC; 1785 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1786 val = opt + 14; 1787 if (*val == '\0') 1788 fatal("Empty force-command option"); 1789 if (certflags_command != NULL) 1790 fatal("force-command already specified"); 1791 certflags_command = xstrdup(val); 1792 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1793 val = opt + 15; 1794 if (*val == '\0') 1795 fatal("Empty source-address option"); 1796 if (certflags_src_addr != NULL) 1797 fatal("source-address already specified"); 1798 if (addr_match_cidr_list(NULL, val) != 0) 1799 fatal("Invalid source-address list"); 1800 certflags_src_addr = xstrdup(val); 1801 } else 1802 fatal("Unsupported certificate option \"%s\"", opt); 1803 } 1804 1805 static void 1806 show_options(const Buffer *optbuf, int v00, int in_critical) 1807 { 1808 char *name; 1809 u_char *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 free(data); 1835 } else { 1836 printf(" UNKNOWN OPTION (len %u)\n", 1837 buffer_len(&option)); 1838 buffer_clear(&option); 1839 } 1840 free(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 1848 static void 1849 do_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 1911 static void 1912 load_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 1930 static void 1931 update_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 certificates 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 certificates 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 free(path); 2051 } 2052 2053 static void 2054 do_gen_krl(struct passwd *pw, int updating, int argc, char **argv) 2055 { 2056 struct ssh_krl *krl; 2057 struct stat sb; 2058 Key *ca = NULL; 2059 int fd, i; 2060 char *tmp; 2061 Buffer kbuf; 2062 2063 if (*identity_file == '\0') 2064 fatal("KRL generation requires an output file"); 2065 if (stat(identity_file, &sb) == -1) { 2066 if (errno != ENOENT) 2067 fatal("Cannot access KRL \"%s\": %s", 2068 identity_file, strerror(errno)); 2069 if (updating) 2070 fatal("KRL \"%s\" does not exist", identity_file); 2071 } 2072 if (ca_key_path != NULL) { 2073 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2074 if ((ca = key_load_public(tmp, NULL)) == NULL) 2075 fatal("Cannot load CA public key %s", tmp); 2076 free(tmp); 2077 } 2078 2079 if (updating) 2080 load_krl(identity_file, &krl); 2081 else if ((krl = ssh_krl_init()) == NULL) 2082 fatal("couldn't create KRL"); 2083 2084 if (cert_serial != 0) 2085 ssh_krl_set_version(krl, cert_serial); 2086 if (identity_comment != NULL) 2087 ssh_krl_set_comment(krl, identity_comment); 2088 2089 for (i = 0; i < argc; i++) 2090 update_krl_from_file(pw, argv[i], ca, krl); 2091 2092 buffer_init(&kbuf); 2093 if (ssh_krl_to_blob(krl, &kbuf, NULL, 0) != 0) 2094 fatal("Couldn't generate KRL"); 2095 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2096 fatal("open %s: %s", identity_file, strerror(errno)); 2097 if (atomicio(vwrite, fd, buffer_ptr(&kbuf), buffer_len(&kbuf)) != 2098 buffer_len(&kbuf)) 2099 fatal("write %s: %s", identity_file, strerror(errno)); 2100 close(fd); 2101 buffer_free(&kbuf); 2102 ssh_krl_free(krl); 2103 if (ca != NULL) 2104 key_free(ca); 2105 } 2106 2107 static void 2108 do_check_krl(struct passwd *pw, int argc, char **argv) 2109 { 2110 int i, r, ret = 0; 2111 char *comment; 2112 struct ssh_krl *krl; 2113 Key *k; 2114 2115 if (*identity_file == '\0') 2116 fatal("KRL checking requires an input file"); 2117 load_krl(identity_file, &krl); 2118 for (i = 0; i < argc; i++) { 2119 if ((k = key_load_public(argv[i], &comment)) == NULL) 2120 fatal("Cannot load public key %s", argv[i]); 2121 r = ssh_krl_check_key(krl, k); 2122 printf("%s%s%s%s: %s\n", argv[i], 2123 *comment ? " (" : "", comment, *comment ? ")" : "", 2124 r == 0 ? "ok" : "REVOKED"); 2125 if (r != 0) 2126 ret = 1; 2127 key_free(k); 2128 free(comment); 2129 } 2130 ssh_krl_free(krl); 2131 exit(ret); 2132 } 2133 2134 static void 2135 usage(void) 2136 { 2137 fprintf(stderr, 2138 "usage: ssh-keygen [-q] [-b bits] [-t dsa | ecdsa | ed25519 | rsa | rsa1]\n" 2139 " [-N new_passphrase] [-C comment] [-f output_keyfile]\n" 2140 " ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]\n" 2141 " ssh-keygen -i [-m key_format] [-f input_keyfile]\n" 2142 " ssh-keygen -e [-m key_format] [-f input_keyfile]\n" 2143 " ssh-keygen -y [-f input_keyfile]\n" 2144 " ssh-keygen -c [-P passphrase] [-C comment] [-f keyfile]\n" 2145 " ssh-keygen -l [-f input_keyfile]\n" 2146 " ssh-keygen -B [-f input_keyfile]\n"); 2147 #ifdef ENABLE_PKCS11 2148 fprintf(stderr, 2149 " ssh-keygen -D pkcs11\n"); 2150 #endif 2151 fprintf(stderr, 2152 " ssh-keygen -F hostname [-f known_hosts_file] [-l]\n" 2153 " ssh-keygen -H [-f known_hosts_file]\n" 2154 " ssh-keygen -R hostname [-f known_hosts_file]\n" 2155 " ssh-keygen -r hostname [-f input_keyfile] [-g]\n" 2156 " ssh-keygen -G output_file [-v] [-b bits] [-M memory] [-S start_point]\n" 2157 " ssh-keygen -T output_file -f input_file [-v] [-a rounds] [-J num_lines]\n" 2158 " [-j start_line] [-K checkpt] [-W generator]\n" 2159 " ssh-keygen -s ca_key -I certificate_identity [-h] [-n principals]\n" 2160 " [-O option] [-V validity_interval] [-z serial_number] file ...\n" 2161 " ssh-keygen -L [-f input_keyfile]\n" 2162 " ssh-keygen -A\n" 2163 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n" 2164 " file ...\n" 2165 " ssh-keygen -Q -f krl_file file ...\n"); 2166 exit(1); 2167 } 2168 2169 /* 2170 * Main program for key management. 2171 */ 2172 int 2173 main(int argc, char **argv) 2174 { 2175 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 2176 char *checkpoint = NULL; 2177 char out_file[MAXPATHLEN], *ep, *rr_hostname = NULL; 2178 Key *private, *public; 2179 struct passwd *pw; 2180 struct stat st; 2181 int opt, type, fd; 2182 u_int32_t memory = 0, generator_wanted = 0; 2183 int do_gen_candidates = 0, do_screen_candidates = 0; 2184 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 2185 unsigned long start_lineno = 0, lines_to_process = 0; 2186 BIGNUM *start = NULL; 2187 FILE *f; 2188 const char *errstr; 2189 2190 extern int optind; 2191 extern char *optarg; 2192 2193 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 2194 sanitise_stdfd(); 2195 2196 OpenSSL_add_all_algorithms(); 2197 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 2198 2199 /* we need this for the home * directory. */ 2200 pw = getpwuid(getuid()); 2201 if (!pw) { 2202 printf("No user exists for uid %lu\n", (u_long)getuid()); 2203 exit(1); 2204 } 2205 if (gethostname(hostname, sizeof(hostname)) < 0) { 2206 perror("gethostname"); 2207 exit(1); 2208 } 2209 2210 /* Remaining characters: EUYdw */ 2211 while ((opt = getopt(argc, argv, "ABHLQXceghiklopquvxy" 2212 "C:D:F:G:I:J:K:M:N:O:P:R:S:T:V:W:Z:a:b:f:g:j:m:n:r:s:t:z:")) != -1) { 2213 switch (opt) { 2214 case 'A': 2215 gen_all_hostkeys = 1; 2216 break; 2217 case 'b': 2218 bits = (u_int32_t)strtonum(optarg, 256, 32768, &errstr); 2219 if (errstr) 2220 fatal("Bits has bad value %s (%s)", 2221 optarg, errstr); 2222 break; 2223 case 'F': 2224 find_host = 1; 2225 rr_hostname = optarg; 2226 break; 2227 case 'H': 2228 hash_hosts = 1; 2229 break; 2230 case 'I': 2231 cert_key_id = optarg; 2232 break; 2233 case 'J': 2234 lines_to_process = strtoul(optarg, NULL, 10); 2235 break; 2236 case 'j': 2237 start_lineno = strtoul(optarg, NULL, 10); 2238 break; 2239 case 'R': 2240 delete_host = 1; 2241 rr_hostname = optarg; 2242 break; 2243 case 'L': 2244 show_cert = 1; 2245 break; 2246 case 'l': 2247 print_fingerprint = 1; 2248 break; 2249 case 'B': 2250 print_bubblebabble = 1; 2251 break; 2252 case 'm': 2253 if (strcasecmp(optarg, "RFC4716") == 0 || 2254 strcasecmp(optarg, "ssh2") == 0) { 2255 convert_format = FMT_RFC4716; 2256 break; 2257 } 2258 if (strcasecmp(optarg, "PKCS8") == 0) { 2259 convert_format = FMT_PKCS8; 2260 break; 2261 } 2262 if (strcasecmp(optarg, "PEM") == 0) { 2263 convert_format = FMT_PEM; 2264 break; 2265 } 2266 fatal("Unsupported conversion format \"%s\"", optarg); 2267 case 'n': 2268 cert_principals = optarg; 2269 break; 2270 case 'o': 2271 use_new_format = 1; 2272 break; 2273 case 'p': 2274 change_passphrase = 1; 2275 break; 2276 case 'c': 2277 change_comment = 1; 2278 break; 2279 case 'f': 2280 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= 2281 sizeof(identity_file)) 2282 fatal("Identity filename too long"); 2283 have_identity = 1; 2284 break; 2285 case 'g': 2286 print_generic = 1; 2287 break; 2288 case 'P': 2289 identity_passphrase = optarg; 2290 break; 2291 case 'N': 2292 identity_new_passphrase = optarg; 2293 break; 2294 case 'Q': 2295 check_krl = 1; 2296 break; 2297 case 'O': 2298 add_cert_option(optarg); 2299 break; 2300 case 'Z': 2301 new_format_cipher = optarg; 2302 break; 2303 case 'C': 2304 identity_comment = optarg; 2305 break; 2306 case 'q': 2307 quiet = 1; 2308 break; 2309 case 'e': 2310 case 'x': 2311 /* export key */ 2312 convert_to = 1; 2313 break; 2314 case 'h': 2315 cert_key_type = SSH2_CERT_TYPE_HOST; 2316 certflags_flags = 0; 2317 break; 2318 case 'k': 2319 gen_krl = 1; 2320 break; 2321 case 'i': 2322 case 'X': 2323 /* import key */ 2324 convert_from = 1; 2325 break; 2326 case 'y': 2327 print_public = 1; 2328 break; 2329 case 's': 2330 ca_key_path = optarg; 2331 break; 2332 case 't': 2333 key_type_name = optarg; 2334 break; 2335 case 'D': 2336 pkcs11provider = optarg; 2337 break; 2338 case 'u': 2339 update_krl = 1; 2340 break; 2341 case 'v': 2342 if (log_level == SYSLOG_LEVEL_INFO) 2343 log_level = SYSLOG_LEVEL_DEBUG1; 2344 else { 2345 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2346 log_level < SYSLOG_LEVEL_DEBUG3) 2347 log_level++; 2348 } 2349 break; 2350 case 'r': 2351 rr_hostname = optarg; 2352 break; 2353 case 'W': 2354 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2355 UINT_MAX, &errstr); 2356 if (errstr) 2357 fatal("Desired generator has bad value: %s (%s)", 2358 optarg, errstr); 2359 break; 2360 case 'a': 2361 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr); 2362 if (errstr) 2363 fatal("Invalid number: %s (%s)", 2364 optarg, errstr); 2365 break; 2366 case 'M': 2367 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2368 if (errstr) 2369 fatal("Memory limit is %s: %s", errstr, optarg); 2370 break; 2371 case 'G': 2372 do_gen_candidates = 1; 2373 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2374 sizeof(out_file)) 2375 fatal("Output filename too long"); 2376 break; 2377 case 'T': 2378 do_screen_candidates = 1; 2379 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2380 sizeof(out_file)) 2381 fatal("Output filename too long"); 2382 break; 2383 case 'K': 2384 if (strlen(optarg) >= MAXPATHLEN) 2385 fatal("Checkpoint filename too long"); 2386 checkpoint = xstrdup(optarg); 2387 break; 2388 case 'S': 2389 /* XXX - also compare length against bits */ 2390 if (BN_hex2bn(&start, optarg) == 0) 2391 fatal("Invalid start point."); 2392 break; 2393 case 'V': 2394 parse_cert_times(optarg); 2395 break; 2396 case 'z': 2397 errno = 0; 2398 cert_serial = strtoull(optarg, &ep, 10); 2399 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 2400 (errno == ERANGE && cert_serial == ULLONG_MAX)) 2401 fatal("Invalid serial number \"%s\"", optarg); 2402 break; 2403 case '?': 2404 default: 2405 usage(); 2406 } 2407 } 2408 2409 /* reinit */ 2410 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2411 2412 argv += optind; 2413 argc -= optind; 2414 2415 if (ca_key_path != NULL) { 2416 if (argc < 1 && !gen_krl) { 2417 printf("Too few arguments.\n"); 2418 usage(); 2419 } 2420 } else if (argc > 0 && !gen_krl && !check_krl) { 2421 printf("Too many arguments.\n"); 2422 usage(); 2423 } 2424 if (change_passphrase && change_comment) { 2425 printf("Can only have one of -p and -c.\n"); 2426 usage(); 2427 } 2428 if (print_fingerprint && (delete_host || hash_hosts)) { 2429 printf("Cannot use -l with -H or -R.\n"); 2430 usage(); 2431 } 2432 if (gen_krl) { 2433 do_gen_krl(pw, update_krl, argc, argv); 2434 return (0); 2435 } 2436 if (check_krl) { 2437 do_check_krl(pw, argc, argv); 2438 return (0); 2439 } 2440 if (ca_key_path != NULL) { 2441 if (cert_key_id == NULL) 2442 fatal("Must specify key id (-I) when certifying"); 2443 do_ca_sign(pw, argc, argv); 2444 } 2445 if (show_cert) 2446 do_show_cert(pw); 2447 if (delete_host || hash_hosts || find_host) 2448 do_known_hosts(pw, rr_hostname); 2449 if (pkcs11provider != NULL) 2450 do_download(pw); 2451 if (print_fingerprint || print_bubblebabble) 2452 do_fingerprint(pw); 2453 if (change_passphrase) 2454 do_change_passphrase(pw); 2455 if (change_comment) 2456 do_change_comment(pw); 2457 if (convert_to) 2458 do_convert_to(pw); 2459 if (convert_from) 2460 do_convert_from(pw); 2461 if (print_public) 2462 do_print_public(pw); 2463 if (rr_hostname != NULL) { 2464 unsigned int n = 0; 2465 2466 if (have_identity) { 2467 n = do_print_resource_record(pw, 2468 identity_file, rr_hostname); 2469 if (n == 0) { 2470 perror(identity_file); 2471 exit(1); 2472 } 2473 exit(0); 2474 } else { 2475 2476 n += do_print_resource_record(pw, 2477 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2478 n += do_print_resource_record(pw, 2479 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2480 n += do_print_resource_record(pw, 2481 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname); 2482 2483 if (n == 0) 2484 fatal("no keys found."); 2485 exit(0); 2486 } 2487 } 2488 2489 if (do_gen_candidates) { 2490 FILE *out = fopen(out_file, "w"); 2491 2492 if (out == NULL) { 2493 error("Couldn't open modulus candidate file \"%s\": %s", 2494 out_file, strerror(errno)); 2495 return (1); 2496 } 2497 if (bits == 0) 2498 bits = DEFAULT_BITS; 2499 if (gen_candidates(out, memory, bits, start) != 0) 2500 fatal("modulus candidate generation failed"); 2501 2502 return (0); 2503 } 2504 2505 if (do_screen_candidates) { 2506 FILE *in; 2507 FILE *out = fopen(out_file, "a"); 2508 2509 if (have_identity && strcmp(identity_file, "-") != 0) { 2510 if ((in = fopen(identity_file, "r")) == NULL) { 2511 fatal("Couldn't open modulus candidate " 2512 "file \"%s\": %s", identity_file, 2513 strerror(errno)); 2514 } 2515 } else 2516 in = stdin; 2517 2518 if (out == NULL) { 2519 fatal("Couldn't open moduli file \"%s\": %s", 2520 out_file, strerror(errno)); 2521 } 2522 if (prime_test(in, out, rounds == 0 ? 100 : rounds, 2523 generator_wanted, checkpoint, 2524 start_lineno, lines_to_process) != 0) 2525 fatal("modulus screening failed"); 2526 return (0); 2527 } 2528 2529 if (gen_all_hostkeys) { 2530 do_gen_all_hostkeys(pw); 2531 return (0); 2532 } 2533 2534 if (key_type_name == NULL) 2535 key_type_name = "rsa"; 2536 2537 type = key_type_from_name(key_type_name); 2538 type_bits_valid(type, &bits); 2539 2540 if (!quiet) 2541 printf("Generating public/private %s key pair.\n", key_type_name); 2542 private = key_generate(type, bits); 2543 if (private == NULL) { 2544 fprintf(stderr, "key_generate failed\n"); 2545 exit(1); 2546 } 2547 public = key_from_private(private); 2548 2549 if (!have_identity) 2550 ask_filename(pw, "Enter file in which to save the key"); 2551 2552 /* Create ~/.ssh directory if it doesn't already exist. */ 2553 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2554 pw->pw_dir, _PATH_SSH_USER_DIR); 2555 if (strstr(identity_file, dotsshdir) != NULL) { 2556 if (stat(dotsshdir, &st) < 0) { 2557 if (errno != ENOENT) { 2558 error("Could not stat %s: %s", dotsshdir, 2559 strerror(errno)); 2560 } else if (mkdir(dotsshdir, 0700) < 0) { 2561 error("Could not create directory '%s': %s", 2562 dotsshdir, strerror(errno)); 2563 } else if (!quiet) 2564 printf("Created directory '%s'.\n", dotsshdir); 2565 } 2566 } 2567 /* If the file already exists, ask the user to confirm. */ 2568 if (stat(identity_file, &st) >= 0) { 2569 char yesno[3]; 2570 printf("%s already exists.\n", identity_file); 2571 printf("Overwrite (y/n)? "); 2572 fflush(stdout); 2573 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2574 exit(1); 2575 if (yesno[0] != 'y' && yesno[0] != 'Y') 2576 exit(1); 2577 } 2578 /* Ask for a passphrase (twice). */ 2579 if (identity_passphrase) 2580 passphrase1 = xstrdup(identity_passphrase); 2581 else if (identity_new_passphrase) 2582 passphrase1 = xstrdup(identity_new_passphrase); 2583 else { 2584 passphrase_again: 2585 passphrase1 = 2586 read_passphrase("Enter passphrase (empty for no " 2587 "passphrase): ", RP_ALLOW_STDIN); 2588 passphrase2 = read_passphrase("Enter same passphrase again: ", 2589 RP_ALLOW_STDIN); 2590 if (strcmp(passphrase1, passphrase2) != 0) { 2591 /* 2592 * The passphrases do not match. Clear them and 2593 * retry. 2594 */ 2595 explicit_bzero(passphrase1, strlen(passphrase1)); 2596 explicit_bzero(passphrase2, strlen(passphrase2)); 2597 free(passphrase1); 2598 free(passphrase2); 2599 printf("Passphrases do not match. Try again.\n"); 2600 goto passphrase_again; 2601 } 2602 /* Clear the other copy of the passphrase. */ 2603 explicit_bzero(passphrase2, strlen(passphrase2)); 2604 free(passphrase2); 2605 } 2606 2607 if (identity_comment) { 2608 strlcpy(comment, identity_comment, sizeof(comment)); 2609 } else { 2610 /* Create default comment field for the passphrase. */ 2611 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2612 } 2613 2614 /* Save the key with the given passphrase and comment. */ 2615 if (!key_save_private(private, identity_file, passphrase1, comment, 2616 use_new_format, new_format_cipher, rounds)) { 2617 printf("Saving the key failed: %s.\n", identity_file); 2618 explicit_bzero(passphrase1, strlen(passphrase1)); 2619 free(passphrase1); 2620 exit(1); 2621 } 2622 /* Clear the passphrase. */ 2623 explicit_bzero(passphrase1, strlen(passphrase1)); 2624 free(passphrase1); 2625 2626 /* Clear the private key and the random number generator. */ 2627 key_free(private); 2628 2629 if (!quiet) 2630 printf("Your identification has been saved in %s.\n", identity_file); 2631 2632 strlcat(identity_file, ".pub", sizeof(identity_file)); 2633 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 2634 if (fd == -1) { 2635 printf("Could not save your public key in %s\n", identity_file); 2636 exit(1); 2637 } 2638 f = fdopen(fd, "w"); 2639 if (f == NULL) { 2640 printf("fdopen %s failed\n", identity_file); 2641 exit(1); 2642 } 2643 if (!key_write(public, f)) 2644 fprintf(stderr, "write key failed\n"); 2645 fprintf(f, " %s\n", comment); 2646 fclose(f); 2647 2648 if (!quiet) { 2649 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 2650 char *ra = key_fingerprint(public, SSH_FP_MD5, 2651 SSH_FP_RANDOMART); 2652 printf("Your public key has been saved in %s.\n", 2653 identity_file); 2654 printf("The key fingerprint is:\n"); 2655 printf("%s %s\n", fp, comment); 2656 printf("The key's randomart image is:\n"); 2657 printf("%s\n", ra); 2658 free(ra); 2659 free(fp); 2660 } 2661 2662 key_free(public); 2663 exit(0); 2664 } 2665