1 /* $NetBSD: ssh-keygen.c,v 1.10 2012/12/12 17:42:40 christos Exp $ */ 2 /* $OpenBSD: ssh-keygen.c,v 1.216 2012/07/06 06:38:03 jmc 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 1.10 2012/12/12 17:42:40 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 "ssh2.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 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 const char *key_type_name = NULL; 144 145 /* Load key from this PKCS#11 provider */ 146 char *pkcs11provider = NULL; 147 148 /* argv0 */ 149 extern char *__progname; 150 151 char hostname[MAXHOSTNAMELEN]; 152 153 /* moduli.c */ 154 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 155 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 156 unsigned long); 157 158 static void 159 type_bits_valid(int type, u_int32_t *bitsp) 160 { 161 u_int maxbits; 162 163 if (type == KEY_UNSPEC) { 164 fprintf(stderr, "unknown key type %s\n", key_type_name); 165 exit(1); 166 } 167 if (*bitsp == 0) { 168 if (type == KEY_DSA) 169 *bitsp = DEFAULT_BITS_DSA; 170 else if (type == KEY_ECDSA) 171 *bitsp = DEFAULT_BITS_ECDSA; 172 else 173 *bitsp = DEFAULT_BITS; 174 } 175 maxbits = (type == KEY_DSA) ? 176 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 177 if (*bitsp > maxbits) { 178 fprintf(stderr, "key bits exceeds maximum %d\n", maxbits); 179 exit(1); 180 } 181 if (type == KEY_DSA && *bitsp != 1024) 182 fatal("DSA keys must be 1024 bits"); 183 else if (type != KEY_ECDSA && *bitsp < 768) 184 fatal("Key must at least be 768 bits"); 185 else if (type == KEY_ECDSA && key_ecdsa_bits_to_nid(*bitsp) == -1) 186 fatal("Invalid ECDSA key length - valid lengths are " 187 "256, 384 or 521 bits"); 188 } 189 190 static void 191 ask_filename(struct passwd *pw, const char *prompt) 192 { 193 char buf[1024]; 194 const char *name = NULL; 195 196 if (key_type_name == NULL) 197 name = _PATH_SSH_CLIENT_ID_RSA; 198 else { 199 switch (key_type_from_name(key_type_name)) { 200 case KEY_RSA1: 201 name = _PATH_SSH_CLIENT_IDENTITY; 202 break; 203 case KEY_DSA_CERT: 204 case KEY_DSA_CERT_V00: 205 case KEY_DSA: 206 name = _PATH_SSH_CLIENT_ID_DSA; 207 break; 208 case KEY_ECDSA_CERT: 209 case KEY_ECDSA: 210 name = _PATH_SSH_CLIENT_ID_ECDSA; 211 break; 212 case KEY_RSA_CERT: 213 case KEY_RSA_CERT_V00: 214 case KEY_RSA: 215 name = _PATH_SSH_CLIENT_ID_RSA; 216 break; 217 default: 218 fprintf(stderr, "bad key type\n"); 219 exit(1); 220 break; 221 } 222 } 223 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 224 fprintf(stderr, "%s (%s): ", prompt, identity_file); 225 if (fgets(buf, sizeof(buf), stdin) == NULL) 226 exit(1); 227 buf[strcspn(buf, "\n")] = '\0'; 228 if (strcmp(buf, "") != 0) 229 strlcpy(identity_file, buf, sizeof(identity_file)); 230 have_identity = 1; 231 } 232 233 static Key * 234 load_identity(char *filename) 235 { 236 char *pass; 237 Key *prv; 238 239 prv = key_load_private(filename, "", NULL); 240 if (prv == NULL) { 241 if (identity_passphrase) 242 pass = xstrdup(identity_passphrase); 243 else 244 pass = read_passphrase("Enter passphrase: ", 245 RP_ALLOW_STDIN); 246 prv = key_load_private(filename, pass, NULL); 247 memset(pass, 0, strlen(pass)); 248 xfree(pass); 249 } 250 return prv; 251 } 252 253 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 254 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 255 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 256 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 257 258 __dead static void 259 do_convert_to_ssh2(struct passwd *pw, Key *k) 260 { 261 u_int len; 262 u_char *blob; 263 char comment[61]; 264 265 if (k->type == KEY_RSA1) { 266 fprintf(stderr, "version 1 keys are not supported\n"); 267 exit(1); 268 } 269 if (key_to_blob(k, &blob, &len) <= 0) { 270 fprintf(stderr, "key_to_blob failed\n"); 271 exit(1); 272 } 273 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 274 snprintf(comment, sizeof(comment), 275 "%u-bit %s, converted by %s@%s from OpenSSH", 276 key_size(k), key_type(k), 277 pw->pw_name, hostname); 278 279 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 280 fprintf(stdout, "Comment: \"%s\"\n", comment); 281 dump_base64(stdout, blob, len); 282 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 283 key_free(k); 284 xfree(blob); 285 exit(0); 286 } 287 288 __dead static void 289 do_convert_to_pkcs8(Key *k) 290 { 291 switch (key_type_plain(k->type)) { 292 case KEY_RSA1: 293 case KEY_RSA: 294 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 295 fatal("PEM_write_RSA_PUBKEY failed"); 296 break; 297 case KEY_DSA: 298 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 299 fatal("PEM_write_DSA_PUBKEY failed"); 300 break; 301 case KEY_ECDSA: 302 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 303 fatal("PEM_write_EC_PUBKEY failed"); 304 break; 305 default: 306 fatal("%s: unsupported key type %s", __func__, key_type(k)); 307 } 308 exit(0); 309 } 310 311 __dead static void 312 do_convert_to_pem(Key *k) 313 { 314 switch (key_type_plain(k->type)) { 315 case KEY_RSA1: 316 case KEY_RSA: 317 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 318 fatal("PEM_write_RSAPublicKey failed"); 319 break; 320 #if notyet /* OpenSSH 0.9.8 lacks this function */ 321 case KEY_DSA: 322 if (!PEM_write_DSAPublicKey(stdout, k->dsa)) 323 fatal("PEM_write_DSAPublicKey failed"); 324 break; 325 #endif 326 /* XXX ECDSA? */ 327 default: 328 fatal("%s: unsupported key type %s", __func__, key_type(k)); 329 } 330 exit(0); 331 } 332 333 __dead static void 334 do_convert_to(struct passwd *pw) 335 { 336 Key *k; 337 struct stat st; 338 339 if (!have_identity) 340 ask_filename(pw, "Enter file in which the key is"); 341 if (stat(identity_file, &st) < 0) 342 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 343 if ((k = key_load_public(identity_file, NULL)) == NULL) { 344 if ((k = load_identity(identity_file)) == NULL) { 345 fprintf(stderr, "load failed\n"); 346 exit(1); 347 } 348 } 349 350 switch (convert_format) { 351 case FMT_RFC4716: 352 do_convert_to_ssh2(pw, k); 353 break; 354 case FMT_PKCS8: 355 do_convert_to_pkcs8(k); 356 break; 357 case FMT_PEM: 358 do_convert_to_pem(k); 359 break; 360 default: 361 fatal("%s: unknown key format %d", __func__, convert_format); 362 } 363 exit(0); 364 } 365 366 static void 367 buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 368 { 369 u_int bignum_bits = buffer_get_int(b); 370 u_int bytes = (bignum_bits + 7) / 8; 371 372 if (buffer_len(b) < bytes) 373 fatal("buffer_get_bignum_bits: input buffer too small: " 374 "need %d have %d", bytes, buffer_len(b)); 375 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL) 376 fatal("buffer_get_bignum_bits: BN_bin2bn failed"); 377 buffer_consume(b, bytes); 378 } 379 380 static Key * 381 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 382 { 383 Buffer b; 384 Key *key = NULL; 385 char *type, *cipher; 386 u_char *sig, data[] = "abcde12345"; 387 int magic, rlen, ktype, i1, i2, i3, i4; 388 u_int slen; 389 u_long e; 390 391 buffer_init(&b); 392 buffer_append(&b, blob, blen); 393 394 magic = buffer_get_int(&b); 395 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 396 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 397 buffer_free(&b); 398 return NULL; 399 } 400 i1 = buffer_get_int(&b); 401 type = buffer_get_string(&b, NULL); 402 cipher = buffer_get_string(&b, NULL); 403 i2 = buffer_get_int(&b); 404 i3 = buffer_get_int(&b); 405 i4 = buffer_get_int(&b); 406 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 407 if (strcmp(cipher, "none") != 0) { 408 error("unsupported cipher %s", cipher); 409 xfree(cipher); 410 buffer_free(&b); 411 xfree(type); 412 return NULL; 413 } 414 xfree(cipher); 415 416 if (strstr(type, "dsa")) { 417 ktype = KEY_DSA; 418 } else if (strstr(type, "rsa")) { 419 ktype = KEY_RSA; 420 } else { 421 buffer_free(&b); 422 xfree(type); 423 return NULL; 424 } 425 key = key_new_private(ktype); 426 xfree(type); 427 428 switch (key->type) { 429 case KEY_DSA: 430 buffer_get_bignum_bits(&b, key->dsa->p); 431 buffer_get_bignum_bits(&b, key->dsa->g); 432 buffer_get_bignum_bits(&b, key->dsa->q); 433 buffer_get_bignum_bits(&b, key->dsa->pub_key); 434 buffer_get_bignum_bits(&b, key->dsa->priv_key); 435 break; 436 case KEY_RSA: 437 e = buffer_get_char(&b); 438 debug("e %lx", e); 439 if (e < 30) { 440 e <<= 8; 441 e += buffer_get_char(&b); 442 debug("e %lx", e); 443 e <<= 8; 444 e += buffer_get_char(&b); 445 debug("e %lx", e); 446 } 447 if (!BN_set_word(key->rsa->e, e)) { 448 buffer_free(&b); 449 key_free(key); 450 return NULL; 451 } 452 buffer_get_bignum_bits(&b, key->rsa->d); 453 buffer_get_bignum_bits(&b, key->rsa->n); 454 buffer_get_bignum_bits(&b, key->rsa->iqmp); 455 buffer_get_bignum_bits(&b, key->rsa->q); 456 buffer_get_bignum_bits(&b, key->rsa->p); 457 rsa_generate_additional_parameters(key->rsa); 458 break; 459 } 460 rlen = buffer_len(&b); 461 if (rlen != 0) 462 error("do_convert_private_ssh2_from_blob: " 463 "remaining bytes in key blob %d", rlen); 464 buffer_free(&b); 465 466 /* try the key */ 467 key_sign(key, &sig, &slen, data, sizeof(data)); 468 key_verify(key, sig, slen, data, sizeof(data)); 469 xfree(sig); 470 return key; 471 } 472 473 static int 474 get_line(FILE *fp, char *line, size_t len) 475 { 476 int c; 477 size_t pos = 0; 478 479 line[0] = '\0'; 480 while ((c = fgetc(fp)) != EOF) { 481 if (pos >= len - 1) { 482 fprintf(stderr, "input line too long.\n"); 483 exit(1); 484 } 485 switch (c) { 486 case '\r': 487 c = fgetc(fp); 488 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { 489 fprintf(stderr, "unget: %s\n", strerror(errno)); 490 exit(1); 491 } 492 return pos; 493 case '\n': 494 return pos; 495 } 496 line[pos++] = c; 497 line[pos] = '\0'; 498 } 499 /* We reached EOF */ 500 return -1; 501 } 502 503 static void 504 do_convert_from_ssh2(struct passwd *pw, Key **k, int *private) 505 { 506 int blen; 507 u_int len; 508 char line[1024]; 509 u_char blob[8096]; 510 char encoded[8096]; 511 int escaped = 0; 512 FILE *fp; 513 514 if ((fp = fopen(identity_file, "r")) == NULL) 515 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 516 encoded[0] = '\0'; 517 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 518 if (line[blen - 1] == '\\') 519 escaped++; 520 if (strncmp(line, "----", 4) == 0 || 521 strstr(line, ": ") != NULL) { 522 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 523 *private = 1; 524 if (strstr(line, " END ") != NULL) { 525 break; 526 } 527 /* fprintf(stderr, "ignore: %s", line); */ 528 continue; 529 } 530 if (escaped) { 531 escaped--; 532 /* fprintf(stderr, "escaped: %s", line); */ 533 continue; 534 } 535 strlcat(encoded, line, sizeof(encoded)); 536 } 537 len = strlen(encoded); 538 if (((len % 4) == 3) && 539 (encoded[len-1] == '=') && 540 (encoded[len-2] == '=') && 541 (encoded[len-3] == '=')) 542 encoded[len-3] = '\0'; 543 blen = uudecode(encoded, blob, sizeof(blob)); 544 if (blen < 0) { 545 fprintf(stderr, "uudecode failed.\n"); 546 exit(1); 547 } 548 *k = *private ? 549 do_convert_private_ssh2_from_blob(blob, blen) : 550 key_from_blob(blob, blen); 551 if (*k == NULL) { 552 fprintf(stderr, "decode blob failed.\n"); 553 exit(1); 554 } 555 fclose(fp); 556 } 557 558 static void 559 do_convert_from_pkcs8(Key **k, int *private) 560 { 561 EVP_PKEY *pubkey; 562 FILE *fp; 563 564 if ((fp = fopen(identity_file, "r")) == NULL) 565 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 566 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 567 fatal("%s: %s is not a recognised public key format", __func__, 568 identity_file); 569 } 570 fclose(fp); 571 switch (EVP_PKEY_type(pubkey->type)) { 572 case EVP_PKEY_RSA: 573 *k = key_new(KEY_UNSPEC); 574 (*k)->type = KEY_RSA; 575 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 576 break; 577 case EVP_PKEY_DSA: 578 *k = key_new(KEY_UNSPEC); 579 (*k)->type = KEY_DSA; 580 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 581 break; 582 case EVP_PKEY_EC: 583 *k = key_new(KEY_UNSPEC); 584 (*k)->type = KEY_ECDSA; 585 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 586 (*k)->ecdsa_nid = key_ecdsa_key_to_nid((*k)->ecdsa); 587 break; 588 default: 589 fatal("%s: unsupported pubkey type %d", __func__, 590 EVP_PKEY_type(pubkey->type)); 591 } 592 EVP_PKEY_free(pubkey); 593 return; 594 } 595 596 static void 597 do_convert_from_pem(Key **k, int *private) 598 { 599 FILE *fp; 600 RSA *rsa; 601 #ifdef notyet 602 DSA *dsa; 603 #endif 604 605 if ((fp = fopen(identity_file, "r")) == NULL) 606 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 607 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 608 *k = key_new(KEY_UNSPEC); 609 (*k)->type = KEY_RSA; 610 (*k)->rsa = rsa; 611 fclose(fp); 612 return; 613 } 614 #if notyet /* OpenSSH 0.9.8 lacks this function */ 615 rewind(fp); 616 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 617 *k = key_new(KEY_UNSPEC); 618 (*k)->type = KEY_DSA; 619 (*k)->dsa = dsa; 620 fclose(fp); 621 return; 622 } 623 /* XXX ECDSA */ 624 #endif 625 fatal("%s: unrecognised raw private key format", __func__); 626 } 627 628 __dead static void 629 do_convert_from(struct passwd *pw) 630 { 631 Key *k = NULL; 632 int private = 0, ok = 0; 633 struct stat st; 634 635 if (!have_identity) 636 ask_filename(pw, "Enter file in which the key is"); 637 if (stat(identity_file, &st) < 0) 638 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 639 640 switch (convert_format) { 641 case FMT_RFC4716: 642 do_convert_from_ssh2(pw, &k, &private); 643 break; 644 case FMT_PKCS8: 645 do_convert_from_pkcs8(&k, &private); 646 break; 647 case FMT_PEM: 648 do_convert_from_pem(&k, &private); 649 break; 650 default: 651 fatal("%s: unknown key format %d", __func__, convert_format); 652 } 653 654 if (!private) 655 ok = key_write(k, stdout); 656 if (ok) 657 fprintf(stdout, "\n"); 658 else { 659 switch (k->type) { 660 case KEY_DSA: 661 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 662 NULL, 0, NULL, NULL); 663 break; 664 case KEY_ECDSA: 665 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 666 NULL, 0, NULL, NULL); 667 break; 668 case KEY_RSA: 669 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 670 NULL, 0, NULL, NULL); 671 break; 672 default: 673 fatal("%s: unsupported key type %s", __func__, 674 key_type(k)); 675 } 676 } 677 678 if (!ok) { 679 fprintf(stderr, "key write failed\n"); 680 exit(1); 681 } 682 key_free(k); 683 exit(0); 684 } 685 686 __dead static void 687 do_print_public(struct passwd *pw) 688 { 689 Key *prv; 690 struct stat st; 691 692 if (!have_identity) 693 ask_filename(pw, "Enter file in which the key is"); 694 if (stat(identity_file, &st) < 0) { 695 perror(identity_file); 696 exit(1); 697 } 698 prv = load_identity(identity_file); 699 if (prv == NULL) { 700 fprintf(stderr, "load failed\n"); 701 exit(1); 702 } 703 if (!key_write(prv, stdout)) 704 fprintf(stderr, "key_write failed"); 705 key_free(prv); 706 fprintf(stdout, "\n"); 707 exit(0); 708 } 709 710 __dead static void 711 do_download(struct passwd *pw) 712 { 713 #ifdef ENABLE_PKCS11 714 Key **keys = NULL; 715 int i, nkeys; 716 717 pkcs11_init(0); 718 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 719 if (nkeys <= 0) 720 fatal("cannot read public key from pkcs11"); 721 for (i = 0; i < nkeys; i++) { 722 key_write(keys[i], stdout); 723 key_free(keys[i]); 724 fprintf(stdout, "\n"); 725 } 726 xfree(keys); 727 pkcs11_terminate(); 728 exit(0); 729 #else 730 fatal("no pkcs11 support"); 731 #endif /* ENABLE_PKCS11 */ 732 } 733 734 __dead static void 735 do_fingerprint(struct passwd *pw) 736 { 737 FILE *f; 738 Key *public; 739 char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra; 740 int i, skip = 0, num = 0, invalid = 1; 741 enum fp_rep rep; 742 enum fp_type fptype; 743 struct stat st; 744 745 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 746 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 747 748 if (!have_identity) 749 ask_filename(pw, "Enter file in which the key is"); 750 if (stat(identity_file, &st) < 0) { 751 perror(identity_file); 752 exit(1); 753 } 754 public = key_load_public(identity_file, &comment); 755 if (public != NULL) { 756 fp = key_fingerprint(public, fptype, rep); 757 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 758 printf("%u %s %s (%s)\n", key_size(public), fp, comment, 759 key_type(public)); 760 if (log_level >= SYSLOG_LEVEL_VERBOSE) 761 printf("%s\n", ra); 762 key_free(public); 763 xfree(comment); 764 xfree(ra); 765 xfree(fp); 766 exit(0); 767 } 768 if (comment) { 769 xfree(comment); 770 comment = NULL; 771 } 772 773 if ((f = fopen(identity_file, "r")) == NULL) 774 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 775 776 while (fgets(line, sizeof(line), f)) { 777 if ((cp = strchr(line, '\n')) == NULL) { 778 error("line %d too long: %.40s...", 779 num + 1, line); 780 skip = 1; 781 continue; 782 } 783 num++; 784 if (skip) { 785 skip = 0; 786 continue; 787 } 788 *cp = '\0'; 789 790 /* Skip leading whitespace, empty and comment lines. */ 791 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 792 ; 793 if (!*cp || *cp == '\n' || *cp == '#') 794 continue; 795 i = strtol(cp, &ep, 10); 796 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 797 int quoted = 0; 798 comment = cp; 799 for (; *cp && (quoted || (*cp != ' ' && 800 *cp != '\t')); cp++) { 801 if (*cp == '\\' && cp[1] == '"') 802 cp++; /* Skip both */ 803 else if (*cp == '"') 804 quoted = !quoted; 805 } 806 if (!*cp) 807 continue; 808 *cp++ = '\0'; 809 } 810 ep = cp; 811 public = key_new(KEY_RSA1); 812 if (key_read(public, &cp) != 1) { 813 cp = ep; 814 key_free(public); 815 public = key_new(KEY_UNSPEC); 816 if (key_read(public, &cp) != 1) { 817 key_free(public); 818 continue; 819 } 820 } 821 comment = *cp ? cp : comment; 822 fp = key_fingerprint(public, fptype, rep); 823 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 824 printf("%u %s %s (%s)\n", key_size(public), fp, 825 comment ? comment : "no comment", key_type(public)); 826 if (log_level >= SYSLOG_LEVEL_VERBOSE) 827 printf("%s\n", ra); 828 xfree(ra); 829 xfree(fp); 830 key_free(public); 831 invalid = 0; 832 } 833 fclose(f); 834 835 if (invalid) { 836 printf("%s is not a public key file.\n", identity_file); 837 exit(1); 838 } 839 exit(0); 840 } 841 842 static void 843 do_gen_all_hostkeys(struct passwd *pw) 844 { 845 struct { 846 const char *key_type; 847 const char *key_type_display; 848 const char *path; 849 } key_types[] = { 850 { "rsa1", "RSA1", _PATH_HOST_KEY_FILE }, 851 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 852 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 853 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 854 { NULL, NULL, NULL } 855 }; 856 857 int first = 0; 858 struct stat st; 859 Key *private, *public; 860 char comment[1024]; 861 int i, type, fd; 862 FILE *f; 863 864 for (i = 0; key_types[i].key_type; i++) { 865 if (stat(key_types[i].path, &st) == 0) 866 continue; 867 if (errno != ENOENT) { 868 printf("Could not stat %s: %s", key_types[i].path, 869 strerror(errno)); 870 first = 0; 871 continue; 872 } 873 874 if (first == 0) { 875 first = 1; 876 printf("%s: generating new host keys: ", __progname); 877 } 878 printf("%s ", key_types[i].key_type_display); 879 fflush(stdout); 880 arc4random_stir(); 881 type = key_type_from_name(key_types[i].key_type); 882 strlcpy(identity_file, key_types[i].path, sizeof(identity_file)); 883 bits = 0; 884 type_bits_valid(type, &bits); 885 private = key_generate(type, bits); 886 if (private == NULL) { 887 fprintf(stderr, "key_generate failed\n"); 888 first = 0; 889 continue; 890 } 891 public = key_from_private(private); 892 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 893 hostname); 894 if (!key_save_private(private, identity_file, "", comment)) { 895 printf("Saving the key failed: %s.\n", identity_file); 896 key_free(private); 897 key_free(public); 898 first = 0; 899 continue; 900 } 901 key_free(private); 902 arc4random_stir(); 903 strlcat(identity_file, ".pub", sizeof(identity_file)); 904 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 905 if (fd == -1) { 906 printf("Could not save your public key in %s\n", 907 identity_file); 908 key_free(public); 909 first = 0; 910 continue; 911 } 912 f = fdopen(fd, "w"); 913 if (f == NULL) { 914 printf("fdopen %s failed\n", identity_file); 915 key_free(public); 916 first = 0; 917 continue; 918 } 919 if (!key_write(public, f)) { 920 fprintf(stderr, "write key failed\n"); 921 key_free(public); 922 first = 0; 923 continue; 924 } 925 fprintf(f, " %s\n", comment); 926 fclose(f); 927 key_free(public); 928 929 } 930 if (first != 0) 931 printf("\n"); 932 } 933 934 static void 935 printhost(FILE *f, const char *name, Key *public, int ca, int hash) 936 { 937 if (print_fingerprint) { 938 enum fp_rep rep; 939 enum fp_type fptype; 940 char *fp, *ra; 941 942 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 943 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 944 fp = key_fingerprint(public, fptype, rep); 945 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 946 printf("%u %s %s (%s)\n", key_size(public), fp, name, 947 key_type(public)); 948 if (log_level >= SYSLOG_LEVEL_VERBOSE) 949 printf("%s\n", ra); 950 xfree(ra); 951 xfree(fp); 952 } else { 953 if (hash && (name = host_hash(name, NULL, 0)) == NULL) 954 fatal("hash_host failed"); 955 fprintf(f, "%s%s%s ", ca ? CA_MARKER : "", ca ? " " : "", name); 956 if (!key_write(public, f)) 957 fatal("key_write failed"); 958 fprintf(f, "\n"); 959 } 960 } 961 962 __dead static void 963 do_known_hosts(struct passwd *pw, const char *name) 964 { 965 FILE *in, *out = stdout; 966 Key *pub; 967 char *cp, *cp2, *kp, *kp2; 968 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; 969 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; 970 int ca; 971 972 if (!have_identity) { 973 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 974 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 975 sizeof(identity_file)) 976 fatal("Specified known hosts path too long"); 977 xfree(cp); 978 have_identity = 1; 979 } 980 if ((in = fopen(identity_file, "r")) == NULL) 981 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 982 983 /* 984 * Find hosts goes to stdout, hash and deletions happen in-place 985 * A corner case is ssh-keygen -HF foo, which should go to stdout 986 */ 987 if (!find_host && (hash_hosts || delete_host)) { 988 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 989 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 990 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 991 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 992 fatal("known_hosts path too long"); 993 umask(077); 994 if ((c = mkstemp(tmp)) == -1) 995 fatal("mkstemp: %s", strerror(errno)); 996 if ((out = fdopen(c, "w")) == NULL) { 997 c = errno; 998 unlink(tmp); 999 fatal("fdopen: %s", strerror(c)); 1000 } 1001 inplace = 1; 1002 } 1003 1004 while (fgets(line, sizeof(line), in)) { 1005 if ((cp = strchr(line, '\n')) == NULL) { 1006 error("line %d too long: %.40s...", num + 1, line); 1007 skip = 1; 1008 invalid = 1; 1009 continue; 1010 } 1011 num++; 1012 if (skip) { 1013 skip = 0; 1014 continue; 1015 } 1016 *cp = '\0'; 1017 1018 /* Skip leading whitespace, empty and comment lines. */ 1019 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 1020 ; 1021 if (!*cp || *cp == '\n' || *cp == '#') { 1022 if (inplace) 1023 fprintf(out, "%s\n", cp); 1024 continue; 1025 } 1026 /* Check whether this is a CA key */ 1027 if (strncasecmp(cp, CA_MARKER, sizeof(CA_MARKER) - 1) == 0 && 1028 (cp[sizeof(CA_MARKER) - 1] == ' ' || 1029 cp[sizeof(CA_MARKER) - 1] == '\t')) { 1030 ca = 1; 1031 cp += sizeof(CA_MARKER); 1032 } else 1033 ca = 0; 1034 1035 /* Find the end of the host name portion. */ 1036 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) 1037 ; 1038 1039 if (*kp == '\0' || *(kp + 1) == '\0') { 1040 error("line %d missing key: %.40s...", 1041 num, line); 1042 invalid = 1; 1043 continue; 1044 } 1045 *kp++ = '\0'; 1046 kp2 = kp; 1047 1048 pub = key_new(KEY_RSA1); 1049 if (key_read(pub, &kp) != 1) { 1050 kp = kp2; 1051 key_free(pub); 1052 pub = key_new(KEY_UNSPEC); 1053 if (key_read(pub, &kp) != 1) { 1054 error("line %d invalid key: %.40s...", 1055 num, line); 1056 key_free(pub); 1057 invalid = 1; 1058 continue; 1059 } 1060 } 1061 1062 if (*cp == HASH_DELIM) { 1063 if (find_host || delete_host) { 1064 cp2 = host_hash(name, cp, strlen(cp)); 1065 if (cp2 == NULL) { 1066 error("line %d: invalid hashed " 1067 "name: %.64s...", num, line); 1068 invalid = 1; 1069 continue; 1070 } 1071 c = (strcmp(cp2, cp) == 0); 1072 if (find_host && c) { 1073 printf("# Host %s found: " 1074 "line %d type %s%s\n", name, 1075 num, key_type(pub), 1076 ca ? " (CA key)" : ""); 1077 printhost(out, cp, pub, ca, 0); 1078 } 1079 if (delete_host && !c && !ca) 1080 printhost(out, cp, pub, ca, 0); 1081 } else if (hash_hosts) 1082 printhost(out, cp, pub, ca, 0); 1083 } else { 1084 if (find_host || delete_host) { 1085 c = (match_hostname(name, cp, 1086 strlen(cp)) == 1); 1087 if (find_host && c) { 1088 printf("# Host %s found: " 1089 "line %d type %s%s\n", name, 1090 num, key_type(pub), 1091 ca ? " (CA key)" : ""); 1092 printhost(out, name, pub, 1093 ca, hash_hosts && !ca); 1094 } 1095 if (delete_host && !c && !ca) 1096 printhost(out, cp, pub, ca, 0); 1097 } else if (hash_hosts) { 1098 for (cp2 = strsep(&cp, ","); 1099 cp2 != NULL && *cp2 != '\0'; 1100 cp2 = strsep(&cp, ",")) { 1101 if (ca) { 1102 fprintf(stderr, "Warning: " 1103 "ignoring CA key for host: " 1104 "%.64s\n", cp2); 1105 printhost(out, cp2, pub, ca, 0); 1106 } else if (strcspn(cp2, "*?!") != 1107 strlen(cp2)) { 1108 fprintf(stderr, "Warning: " 1109 "ignoring host name with " 1110 "metacharacters: %.64s\n", 1111 cp2); 1112 printhost(out, cp2, pub, ca, 0); 1113 } else 1114 printhost(out, cp2, pub, ca, 1); 1115 } 1116 has_unhashed = 1; 1117 } 1118 } 1119 key_free(pub); 1120 } 1121 fclose(in); 1122 1123 if (invalid) { 1124 fprintf(stderr, "%s is not a valid known_hosts file.\n", 1125 identity_file); 1126 if (inplace) { 1127 fprintf(stderr, "Not replacing existing known_hosts " 1128 "file because of errors\n"); 1129 fclose(out); 1130 unlink(tmp); 1131 } 1132 exit(1); 1133 } 1134 1135 if (inplace) { 1136 fclose(out); 1137 1138 /* Backup existing file */ 1139 if (unlink(old) == -1 && errno != ENOENT) 1140 fatal("unlink %.100s: %s", old, strerror(errno)); 1141 if (link(identity_file, old) == -1) 1142 fatal("link %.100s to %.100s: %s", identity_file, old, 1143 strerror(errno)); 1144 /* Move new one into place */ 1145 if (rename(tmp, identity_file) == -1) { 1146 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1147 strerror(errno)); 1148 unlink(tmp); 1149 unlink(old); 1150 exit(1); 1151 } 1152 1153 fprintf(stderr, "%s updated.\n", identity_file); 1154 fprintf(stderr, "Original contents retained as %s\n", old); 1155 if (has_unhashed) { 1156 fprintf(stderr, "WARNING: %s contains unhashed " 1157 "entries\n", old); 1158 fprintf(stderr, "Delete this file to ensure privacy " 1159 "of hostnames\n"); 1160 } 1161 } 1162 1163 exit(0); 1164 } 1165 1166 /* 1167 * Perform changing a passphrase. The argument is the passwd structure 1168 * for the current user. 1169 */ 1170 __dead static void 1171 do_change_passphrase(struct passwd *pw) 1172 { 1173 char *comment; 1174 char *old_passphrase, *passphrase1, *passphrase2; 1175 struct stat st; 1176 Key *private; 1177 1178 if (!have_identity) 1179 ask_filename(pw, "Enter file in which the key is"); 1180 if (stat(identity_file, &st) < 0) { 1181 perror(identity_file); 1182 exit(1); 1183 } 1184 /* Try to load the file with empty passphrase. */ 1185 private = key_load_private(identity_file, "", &comment); 1186 if (private == NULL) { 1187 if (identity_passphrase) 1188 old_passphrase = xstrdup(identity_passphrase); 1189 else 1190 old_passphrase = 1191 read_passphrase("Enter old passphrase: ", 1192 RP_ALLOW_STDIN); 1193 private = key_load_private(identity_file, old_passphrase, 1194 &comment); 1195 memset(old_passphrase, 0, strlen(old_passphrase)); 1196 xfree(old_passphrase); 1197 if (private == NULL) { 1198 printf("Bad passphrase.\n"); 1199 exit(1); 1200 } 1201 } 1202 printf("Key has comment '%s'\n", comment); 1203 1204 /* Ask the new passphrase (twice). */ 1205 if (identity_new_passphrase) { 1206 passphrase1 = xstrdup(identity_new_passphrase); 1207 passphrase2 = NULL; 1208 } else { 1209 passphrase1 = 1210 read_passphrase("Enter new passphrase (empty for no " 1211 "passphrase): ", RP_ALLOW_STDIN); 1212 passphrase2 = read_passphrase("Enter same passphrase again: ", 1213 RP_ALLOW_STDIN); 1214 1215 /* Verify that they are the same. */ 1216 if (strcmp(passphrase1, passphrase2) != 0) { 1217 memset(passphrase1, 0, strlen(passphrase1)); 1218 memset(passphrase2, 0, strlen(passphrase2)); 1219 xfree(passphrase1); 1220 xfree(passphrase2); 1221 printf("Pass phrases do not match. Try again.\n"); 1222 exit(1); 1223 } 1224 /* Destroy the other copy. */ 1225 memset(passphrase2, 0, strlen(passphrase2)); 1226 xfree(passphrase2); 1227 } 1228 1229 /* Save the file using the new passphrase. */ 1230 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1231 printf("Saving the key failed: %s.\n", identity_file); 1232 memset(passphrase1, 0, strlen(passphrase1)); 1233 xfree(passphrase1); 1234 key_free(private); 1235 xfree(comment); 1236 exit(1); 1237 } 1238 /* Destroy the passphrase and the copy of the key in memory. */ 1239 memset(passphrase1, 0, strlen(passphrase1)); 1240 xfree(passphrase1); 1241 key_free(private); /* Destroys contents */ 1242 xfree(comment); 1243 1244 printf("Your identification has been saved with the new passphrase.\n"); 1245 exit(0); 1246 } 1247 1248 /* 1249 * Print the SSHFP RR. 1250 */ 1251 static int 1252 do_print_resource_record(struct passwd *pw, const char *fname, 1253 const char *hname) 1254 { 1255 Key *public; 1256 char *comment = NULL; 1257 struct stat st; 1258 1259 if (fname == NULL) 1260 ask_filename(pw, "Enter file in which the key is"); 1261 if (stat(fname, &st) < 0) { 1262 if (errno == ENOENT) 1263 return 0; 1264 perror(fname); 1265 exit(1); 1266 } 1267 public = key_load_public(fname, &comment); 1268 if (public != NULL) { 1269 export_dns_rr(hname, public, stdout, print_generic); 1270 key_free(public); 1271 xfree(comment); 1272 return 1; 1273 } 1274 if (comment) 1275 xfree(comment); 1276 1277 printf("failed to read v2 public key from %s.\n", fname); 1278 exit(1); 1279 } 1280 1281 /* 1282 * Change the comment of a private key file. 1283 */ 1284 __dead static void 1285 do_change_comment(struct passwd *pw) 1286 { 1287 char new_comment[1024], *comment, *passphrase; 1288 Key *private; 1289 Key *public; 1290 struct stat st; 1291 FILE *f; 1292 int fd; 1293 1294 if (!have_identity) 1295 ask_filename(pw, "Enter file in which the key is"); 1296 if (stat(identity_file, &st) < 0) { 1297 perror(identity_file); 1298 exit(1); 1299 } 1300 private = key_load_private(identity_file, "", &comment); 1301 if (private == NULL) { 1302 if (identity_passphrase) 1303 passphrase = xstrdup(identity_passphrase); 1304 else if (identity_new_passphrase) 1305 passphrase = xstrdup(identity_new_passphrase); 1306 else 1307 passphrase = read_passphrase("Enter passphrase: ", 1308 RP_ALLOW_STDIN); 1309 /* Try to load using the passphrase. */ 1310 private = key_load_private(identity_file, passphrase, &comment); 1311 if (private == NULL) { 1312 memset(passphrase, 0, strlen(passphrase)); 1313 xfree(passphrase); 1314 printf("Bad passphrase.\n"); 1315 exit(1); 1316 } 1317 } else { 1318 passphrase = xstrdup(""); 1319 } 1320 if (private->type != KEY_RSA1) { 1321 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 1322 key_free(private); 1323 exit(1); 1324 } 1325 printf("Key now has comment '%s'\n", comment); 1326 1327 if (identity_comment) { 1328 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1329 } else { 1330 printf("Enter new comment: "); 1331 fflush(stdout); 1332 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1333 memset(passphrase, 0, strlen(passphrase)); 1334 key_free(private); 1335 exit(1); 1336 } 1337 new_comment[strcspn(new_comment, "\n")] = '\0'; 1338 } 1339 1340 /* Save the file using the new passphrase. */ 1341 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 1342 printf("Saving the key failed: %s.\n", identity_file); 1343 memset(passphrase, 0, strlen(passphrase)); 1344 xfree(passphrase); 1345 key_free(private); 1346 xfree(comment); 1347 exit(1); 1348 } 1349 memset(passphrase, 0, strlen(passphrase)); 1350 xfree(passphrase); 1351 public = key_from_private(private); 1352 key_free(private); 1353 1354 strlcat(identity_file, ".pub", sizeof(identity_file)); 1355 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1356 if (fd == -1) { 1357 printf("Could not save your public key in %s\n", identity_file); 1358 exit(1); 1359 } 1360 f = fdopen(fd, "w"); 1361 if (f == NULL) { 1362 printf("fdopen %s failed\n", identity_file); 1363 exit(1); 1364 } 1365 if (!key_write(public, f)) 1366 fprintf(stderr, "write key failed\n"); 1367 key_free(public); 1368 fprintf(f, " %s\n", new_comment); 1369 fclose(f); 1370 1371 xfree(comment); 1372 1373 printf("The comment in your key file has been changed.\n"); 1374 exit(0); 1375 } 1376 1377 static const char * 1378 fmt_validity(u_int64_t valid_from, u_int64_t valid_to) 1379 { 1380 char from[32], to[32]; 1381 static char ret[64]; 1382 time_t tt; 1383 struct tm *tm; 1384 1385 *from = *to = '\0'; 1386 if (valid_from == 0 && valid_to == 0xffffffffffffffffULL) 1387 return "forever"; 1388 1389 if (valid_from != 0) { 1390 /* XXX revisit INT_MAX in 2038 :) */ 1391 tt = valid_from > INT_MAX ? INT_MAX : valid_from; 1392 tm = localtime(&tt); 1393 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); 1394 } 1395 if (valid_to != 0xffffffffffffffffULL) { 1396 /* XXX revisit INT_MAX in 2038 :) */ 1397 tt = valid_to > INT_MAX ? INT_MAX : valid_to; 1398 tm = localtime(&tt); 1399 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); 1400 } 1401 1402 if (valid_from == 0) { 1403 snprintf(ret, sizeof(ret), "before %s", to); 1404 return ret; 1405 } 1406 if (valid_to == 0xffffffffffffffffULL) { 1407 snprintf(ret, sizeof(ret), "after %s", from); 1408 return ret; 1409 } 1410 1411 snprintf(ret, sizeof(ret), "from %s to %s", from, to); 1412 return ret; 1413 } 1414 1415 static void 1416 add_flag_option(Buffer *c, const char *name) 1417 { 1418 debug3("%s: %s", __func__, name); 1419 buffer_put_cstring(c, name); 1420 buffer_put_string(c, NULL, 0); 1421 } 1422 1423 static void 1424 add_string_option(Buffer *c, const char *name, const char *value) 1425 { 1426 Buffer b; 1427 1428 debug3("%s: %s=%s", __func__, name, value); 1429 buffer_init(&b); 1430 buffer_put_cstring(&b, value); 1431 1432 buffer_put_cstring(c, name); 1433 buffer_put_string(c, buffer_ptr(&b), buffer_len(&b)); 1434 1435 buffer_free(&b); 1436 } 1437 1438 #define OPTIONS_CRITICAL 1 1439 #define OPTIONS_EXTENSIONS 2 1440 static void 1441 prepare_options_buf(Buffer *c, int which) 1442 { 1443 buffer_clear(c); 1444 if ((which & OPTIONS_CRITICAL) != 0 && 1445 certflags_command != NULL) 1446 add_string_option(c, "force-command", certflags_command); 1447 if ((which & OPTIONS_EXTENSIONS) != 0 && 1448 (certflags_flags & CERTOPT_X_FWD) != 0) 1449 add_flag_option(c, "permit-X11-forwarding"); 1450 if ((which & OPTIONS_EXTENSIONS) != 0 && 1451 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1452 add_flag_option(c, "permit-agent-forwarding"); 1453 if ((which & OPTIONS_EXTENSIONS) != 0 && 1454 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1455 add_flag_option(c, "permit-port-forwarding"); 1456 if ((which & OPTIONS_EXTENSIONS) != 0 && 1457 (certflags_flags & CERTOPT_PTY) != 0) 1458 add_flag_option(c, "permit-pty"); 1459 if ((which & OPTIONS_EXTENSIONS) != 0 && 1460 (certflags_flags & CERTOPT_USER_RC) != 0) 1461 add_flag_option(c, "permit-user-rc"); 1462 if ((which & OPTIONS_CRITICAL) != 0 && 1463 certflags_src_addr != NULL) 1464 add_string_option(c, "source-address", certflags_src_addr); 1465 } 1466 1467 static Key * 1468 load_pkcs11_key(char *path) 1469 { 1470 #ifdef ENABLE_PKCS11 1471 Key **keys = NULL, *public, *private = NULL; 1472 int i, nkeys; 1473 1474 if ((public = key_load_public(path, NULL)) == NULL) 1475 fatal("Couldn't load CA public key \"%s\"", path); 1476 1477 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1478 debug3("%s: %d keys", __func__, nkeys); 1479 if (nkeys <= 0) 1480 fatal("cannot read public key from pkcs11"); 1481 for (i = 0; i < nkeys; i++) { 1482 if (key_equal_public(public, keys[i])) { 1483 private = keys[i]; 1484 continue; 1485 } 1486 key_free(keys[i]); 1487 } 1488 xfree(keys); 1489 key_free(public); 1490 return private; 1491 #else 1492 fatal("no pkcs11 support"); 1493 #endif /* ENABLE_PKCS11 */ 1494 } 1495 1496 __dead static void 1497 do_ca_sign(struct passwd *pw, int argc, char **argv) 1498 { 1499 int i, fd; 1500 u_int n; 1501 Key *ca, *public; 1502 char *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1503 FILE *f; 1504 int v00 = 0; /* legacy keys */ 1505 1506 if (key_type_name != NULL) { 1507 switch (key_type_from_name(key_type_name)) { 1508 case KEY_RSA_CERT_V00: 1509 case KEY_DSA_CERT_V00: 1510 v00 = 1; 1511 break; 1512 case KEY_UNSPEC: 1513 if (strcasecmp(key_type_name, "v00") == 0) { 1514 v00 = 1; 1515 break; 1516 } else if (strcasecmp(key_type_name, "v01") == 0) 1517 break; 1518 /* FALLTHROUGH */ 1519 default: 1520 fprintf(stderr, "unknown key type %s\n", key_type_name); 1521 exit(1); 1522 } 1523 } 1524 1525 pkcs11_init(1); 1526 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1527 if (pkcs11provider != NULL) { 1528 if ((ca = load_pkcs11_key(tmp)) == NULL) 1529 fatal("No PKCS#11 key matching %s found", ca_key_path); 1530 } else if ((ca = load_identity(tmp)) == NULL) 1531 fatal("Couldn't load CA key \"%s\"", tmp); 1532 xfree(tmp); 1533 1534 for (i = 0; i < argc; i++) { 1535 /* Split list of principals */ 1536 n = 0; 1537 if (cert_principals != NULL) { 1538 otmp = tmp = xstrdup(cert_principals); 1539 plist = NULL; 1540 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1541 plist = xrealloc(plist, n + 1, sizeof(*plist)); 1542 if (*(plist[n] = xstrdup(cp)) == '\0') 1543 fatal("Empty principal name"); 1544 } 1545 xfree(otmp); 1546 } 1547 1548 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1549 if ((public = key_load_public(tmp, &comment)) == NULL) 1550 fatal("%s: unable to open \"%s\"", __func__, tmp); 1551 if (public->type != KEY_RSA && public->type != KEY_DSA && 1552 public->type != KEY_ECDSA) 1553 fatal("%s: key \"%s\" type %s cannot be certified", 1554 __func__, tmp, key_type(public)); 1555 1556 /* Prepare certificate to sign */ 1557 if (key_to_certified(public, v00) != 0) 1558 fatal("Could not upgrade key %s to certificate", tmp); 1559 public->cert->type = cert_key_type; 1560 public->cert->serial = (u_int64_t)cert_serial; 1561 public->cert->key_id = xstrdup(cert_key_id); 1562 public->cert->nprincipals = n; 1563 public->cert->principals = plist; 1564 public->cert->valid_after = cert_valid_from; 1565 public->cert->valid_before = cert_valid_to; 1566 if (v00) { 1567 prepare_options_buf(&public->cert->critical, 1568 OPTIONS_CRITICAL|OPTIONS_EXTENSIONS); 1569 } else { 1570 prepare_options_buf(&public->cert->critical, 1571 OPTIONS_CRITICAL); 1572 prepare_options_buf(&public->cert->extensions, 1573 OPTIONS_EXTENSIONS); 1574 } 1575 public->cert->signature_key = key_from_private(ca); 1576 1577 if (key_certify(public, ca) != 0) 1578 fatal("Couldn't not certify key %s", tmp); 1579 1580 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1581 *cp = '\0'; 1582 xasprintf(&out, "%s-cert.pub", tmp); 1583 xfree(tmp); 1584 1585 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1586 fatal("Could not open \"%s\" for writing: %s", out, 1587 strerror(errno)); 1588 if ((f = fdopen(fd, "w")) == NULL) 1589 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1590 if (!key_write(public, f)) 1591 fatal("Could not write certified key to %s", out); 1592 fprintf(f, " %s\n", comment); 1593 fclose(f); 1594 1595 if (!quiet) { 1596 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1597 "valid %s", key_cert_type(public), 1598 out, public->cert->key_id, 1599 (unsigned long long)public->cert->serial, 1600 cert_principals != NULL ? " for " : "", 1601 cert_principals != NULL ? cert_principals : "", 1602 fmt_validity(cert_valid_from, cert_valid_to)); 1603 } 1604 1605 key_free(public); 1606 xfree(out); 1607 } 1608 pkcs11_terminate(); 1609 exit(0); 1610 } 1611 1612 static u_int64_t 1613 parse_relative_time(const char *s, time_t now) 1614 { 1615 int64_t mul, secs; 1616 1617 mul = *s == '-' ? -1 : 1; 1618 1619 if ((secs = convtime(s + 1)) == -1) 1620 fatal("Invalid relative certificate time %s", s); 1621 if (mul == -1 && secs > now) 1622 fatal("Certificate time %s cannot be represented", s); 1623 return now + (u_int64_t)(secs * mul); 1624 } 1625 1626 static u_int64_t 1627 parse_absolute_time(const char *s) 1628 { 1629 struct tm tm; 1630 time_t tt; 1631 char buf[32]; 1632 const char *fmt; 1633 1634 /* 1635 * POSIX strptime says "The application shall ensure that there 1636 * is white-space or other non-alphanumeric characters between 1637 * any two conversion specifications" so arrange things this way. 1638 */ 1639 switch (strlen(s)) { 1640 case 8: 1641 fmt = "%Y-%m-%d"; 1642 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1643 break; 1644 case 14: 1645 fmt = "%Y-%m-%dT%H:%M:%S"; 1646 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1647 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1648 break; 1649 default: 1650 fatal("Invalid certificate time format %s", s); 1651 } 1652 1653 bzero(&tm, sizeof(tm)); 1654 if (strptime(buf, fmt, &tm) == NULL) 1655 fatal("Invalid certificate time %s", s); 1656 if ((tt = mktime(&tm)) < 0) 1657 fatal("Certificate time %s cannot be represented", s); 1658 return (u_int64_t)tt; 1659 } 1660 1661 static void 1662 parse_cert_times(char *timespec) 1663 { 1664 char *from, *to; 1665 time_t now = time(NULL); 1666 int64_t secs; 1667 1668 /* +timespec relative to now */ 1669 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1670 if ((secs = convtime(timespec + 1)) == -1) 1671 fatal("Invalid relative certificate life %s", timespec); 1672 cert_valid_to = now + secs; 1673 /* 1674 * Backdate certificate one minute to avoid problems on hosts 1675 * with poorly-synchronised clocks. 1676 */ 1677 cert_valid_from = ((now - 59)/ 60) * 60; 1678 return; 1679 } 1680 1681 /* 1682 * from:to, where 1683 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1684 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1685 */ 1686 from = xstrdup(timespec); 1687 to = strchr(from, ':'); 1688 if (to == NULL || from == to || *(to + 1) == '\0') 1689 fatal("Invalid certificate life specification %s", timespec); 1690 *to++ = '\0'; 1691 1692 if (*from == '-' || *from == '+') 1693 cert_valid_from = parse_relative_time(from, now); 1694 else 1695 cert_valid_from = parse_absolute_time(from); 1696 1697 if (*to == '-' || *to == '+') 1698 cert_valid_to = parse_relative_time(to, cert_valid_from); 1699 else 1700 cert_valid_to = parse_absolute_time(to); 1701 1702 if (cert_valid_to <= cert_valid_from) 1703 fatal("Empty certificate validity interval"); 1704 xfree(from); 1705 } 1706 1707 static void 1708 add_cert_option(char *opt) 1709 { 1710 char *val; 1711 1712 if (strcasecmp(opt, "clear") == 0) 1713 certflags_flags = 0; 1714 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1715 certflags_flags &= ~CERTOPT_X_FWD; 1716 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1717 certflags_flags |= CERTOPT_X_FWD; 1718 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1719 certflags_flags &= ~CERTOPT_AGENT_FWD; 1720 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1721 certflags_flags |= CERTOPT_AGENT_FWD; 1722 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1723 certflags_flags &= ~CERTOPT_PORT_FWD; 1724 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1725 certflags_flags |= CERTOPT_PORT_FWD; 1726 else if (strcasecmp(opt, "no-pty") == 0) 1727 certflags_flags &= ~CERTOPT_PTY; 1728 else if (strcasecmp(opt, "permit-pty") == 0) 1729 certflags_flags |= CERTOPT_PTY; 1730 else if (strcasecmp(opt, "no-user-rc") == 0) 1731 certflags_flags &= ~CERTOPT_USER_RC; 1732 else if (strcasecmp(opt, "permit-user-rc") == 0) 1733 certflags_flags |= CERTOPT_USER_RC; 1734 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1735 val = opt + 14; 1736 if (*val == '\0') 1737 fatal("Empty force-command option"); 1738 if (certflags_command != NULL) 1739 fatal("force-command already specified"); 1740 certflags_command = xstrdup(val); 1741 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1742 val = opt + 15; 1743 if (*val == '\0') 1744 fatal("Empty source-address option"); 1745 if (certflags_src_addr != NULL) 1746 fatal("source-address already specified"); 1747 if (addr_match_cidr_list(NULL, val) != 0) 1748 fatal("Invalid source-address list"); 1749 certflags_src_addr = xstrdup(val); 1750 } else 1751 fatal("Unsupported certificate option \"%s\"", opt); 1752 } 1753 1754 static void 1755 show_options(const Buffer *optbuf, int v00, int in_critical) 1756 { 1757 u_char *name, *data; 1758 u_int dlen; 1759 Buffer options, option; 1760 1761 buffer_init(&options); 1762 buffer_append(&options, buffer_ptr(optbuf), buffer_len(optbuf)); 1763 1764 buffer_init(&option); 1765 while (buffer_len(&options) != 0) { 1766 name = buffer_get_string(&options, NULL); 1767 data = buffer_get_string_ptr(&options, &dlen); 1768 buffer_append(&option, data, dlen); 1769 printf(" %s", name); 1770 if ((v00 || !in_critical) && 1771 (strcmp(name, "permit-X11-forwarding") == 0 || 1772 strcmp(name, "permit-agent-forwarding") == 0 || 1773 strcmp(name, "permit-port-forwarding") == 0 || 1774 strcmp(name, "permit-pty") == 0 || 1775 strcmp(name, "permit-user-rc") == 0)) 1776 printf("\n"); 1777 else if ((v00 || in_critical) && 1778 (strcmp(name, "force-command") == 0 || 1779 strcmp(name, "source-address") == 0)) { 1780 data = buffer_get_string(&option, NULL); 1781 printf(" %s\n", data); 1782 xfree(data); 1783 } else { 1784 printf(" UNKNOWN OPTION (len %u)\n", 1785 buffer_len(&option)); 1786 buffer_clear(&option); 1787 } 1788 xfree(name); 1789 if (buffer_len(&option) != 0) 1790 fatal("Option corrupt: extra data at end"); 1791 } 1792 buffer_free(&option); 1793 buffer_free(&options); 1794 } 1795 1796 __dead static void 1797 do_show_cert(struct passwd *pw) 1798 { 1799 Key *key; 1800 struct stat st; 1801 char *key_fp, *ca_fp; 1802 u_int i, v00; 1803 1804 if (!have_identity) 1805 ask_filename(pw, "Enter file in which the key is"); 1806 if (stat(identity_file, &st) < 0) 1807 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1808 if ((key = key_load_public(identity_file, NULL)) == NULL) 1809 fatal("%s is not a public key", identity_file); 1810 if (!key_is_cert(key)) 1811 fatal("%s is not a certificate", identity_file); 1812 v00 = key->type == KEY_RSA_CERT_V00 || key->type == KEY_DSA_CERT_V00; 1813 1814 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); 1815 ca_fp = key_fingerprint(key->cert->signature_key, 1816 SSH_FP_MD5, SSH_FP_HEX); 1817 1818 printf("%s:\n", identity_file); 1819 printf(" Type: %s %s certificate\n", key_ssh_name(key), 1820 key_cert_type(key)); 1821 printf(" Public key: %s %s\n", key_type(key), key_fp); 1822 printf(" Signing CA: %s %s\n", 1823 key_type(key->cert->signature_key), ca_fp); 1824 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1825 if (!v00) { 1826 printf(" Serial: %llu\n", 1827 (unsigned long long)key->cert->serial); 1828 } 1829 printf(" Valid: %s\n", 1830 fmt_validity(key->cert->valid_after, key->cert->valid_before)); 1831 printf(" Principals: "); 1832 if (key->cert->nprincipals == 0) 1833 printf("(none)\n"); 1834 else { 1835 for (i = 0; i < key->cert->nprincipals; i++) 1836 printf("\n %s", 1837 key->cert->principals[i]); 1838 printf("\n"); 1839 } 1840 printf(" Critical Options: "); 1841 if (buffer_len(&key->cert->critical) == 0) 1842 printf("(none)\n"); 1843 else { 1844 printf("\n"); 1845 show_options(&key->cert->critical, v00, 1); 1846 } 1847 if (!v00) { 1848 printf(" Extensions: "); 1849 if (buffer_len(&key->cert->extensions) == 0) 1850 printf("(none)\n"); 1851 else { 1852 printf("\n"); 1853 show_options(&key->cert->extensions, v00, 0); 1854 } 1855 } 1856 exit(0); 1857 } 1858 1859 __dead static void 1860 usage(void) 1861 { 1862 fprintf(stderr, "usage: %s [options]\n", __progname); 1863 fprintf(stderr, "Options:\n"); 1864 fprintf(stderr, " -A Generate non-existent host keys for all key types.\n"); 1865 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); 1866 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 1867 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 1868 fprintf(stderr, " -C comment Provide new comment.\n"); 1869 fprintf(stderr, " -c Change comment in private and public key files.\n"); 1870 #ifdef ENABLE_PKCS11 1871 fprintf(stderr, " -D pkcs11 Download public key from pkcs11 token.\n"); 1872 #endif 1873 fprintf(stderr, " -e Export OpenSSH to foreign format key file.\n"); 1874 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); 1875 fprintf(stderr, " -f filename Filename of the key file.\n"); 1876 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); 1877 fprintf(stderr, " -g Use generic DNS resource record format.\n"); 1878 fprintf(stderr, " -H Hash names in known_hosts file.\n"); 1879 fprintf(stderr, " -h Generate host certificate instead of a user certificate.\n"); 1880 fprintf(stderr, " -I key_id Key identifier to include in certificate.\n"); 1881 fprintf(stderr, " -i Import foreign format to OpenSSH key file.\n"); 1882 fprintf(stderr, " -J number Screen this number of moduli lines.\n"); 1883 fprintf(stderr, " -j number Start screening moduli at specified line.\n"); 1884 fprintf(stderr, " -K checkpt Write checkpoints to this file.\n"); 1885 fprintf(stderr, " -L Print the contents of a certificate.\n"); 1886 fprintf(stderr, " -l Show fingerprint of key file.\n"); 1887 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); 1888 fprintf(stderr, " -m key_fmt Conversion format for -e/-i (PEM|PKCS8|RFC4716).\n"); 1889 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 1890 fprintf(stderr, " -n name,... User/host principal names to include in certificate\n"); 1891 fprintf(stderr, " -O option Specify a certificate option.\n"); 1892 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 1893 fprintf(stderr, " -p Change passphrase of private key file.\n"); 1894 fprintf(stderr, " -q Quiet.\n"); 1895 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); 1896 fprintf(stderr, " -r hostname Print DNS resource record.\n"); 1897 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); 1898 fprintf(stderr, " -s ca_key Certify keys with CA key.\n"); 1899 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); 1900 fprintf(stderr, " -t type Specify type of key to create.\n"); 1901 fprintf(stderr, " -V from:to Specify certificate validity interval.\n"); 1902 fprintf(stderr, " -v Verbose.\n"); 1903 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); 1904 fprintf(stderr, " -y Read private key file and print public key.\n"); 1905 fprintf(stderr, " -z serial Specify a serial number.\n"); 1906 1907 exit(1); 1908 } 1909 1910 /* 1911 * Main program for key management. 1912 */ 1913 int 1914 main(int argc, char **argv) 1915 { 1916 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 1917 char *checkpoint = NULL; 1918 char out_file[MAXPATHLEN], *rr_hostname = NULL; 1919 Key *private, *public; 1920 struct passwd *pw; 1921 struct stat st; 1922 int opt, type, fd; 1923 u_int32_t memory = 0, generator_wanted = 0, trials = 100; 1924 int do_gen_candidates = 0, do_screen_candidates = 0; 1925 int gen_all_hostkeys = 0; 1926 unsigned long start_lineno = 0, lines_to_process = 0; 1927 BIGNUM *start = NULL; 1928 FILE *f; 1929 const char *errstr; 1930 1931 extern int optind; 1932 extern char *optarg; 1933 1934 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 1935 sanitise_stdfd(); 1936 1937 OpenSSL_add_all_algorithms(); 1938 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 1939 1940 /* we need this for the home * directory. */ 1941 pw = getpwuid(getuid()); 1942 if (!pw) { 1943 printf("You don't exist, go away!\n"); 1944 exit(1); 1945 } 1946 if (gethostname(hostname, sizeof(hostname)) < 0) { 1947 perror("gethostname"); 1948 exit(1); 1949 } 1950 1951 while ((opt = getopt(argc, argv, "AegiqpclBHLhvxXyF:b:f:t:D:I:J:j:K:P:" 1952 "m:N:n:O:C:r:g:R:T:G:M:S:s:a:V:W:z")) != -1) { 1953 switch (opt) { 1954 case 'A': 1955 gen_all_hostkeys = 1; 1956 break; 1957 case 'b': 1958 bits = (u_int32_t)strtonum(optarg, 256, 32768, &errstr); 1959 if (errstr) 1960 fatal("Bits has bad value %s (%s)", 1961 optarg, errstr); 1962 break; 1963 case 'F': 1964 find_host = 1; 1965 rr_hostname = optarg; 1966 break; 1967 case 'H': 1968 hash_hosts = 1; 1969 break; 1970 case 'I': 1971 cert_key_id = optarg; 1972 break; 1973 case 'J': 1974 lines_to_process = strtoul(optarg, NULL, 10); 1975 break; 1976 case 'j': 1977 start_lineno = strtoul(optarg, NULL, 10); 1978 break; 1979 case 'R': 1980 delete_host = 1; 1981 rr_hostname = optarg; 1982 break; 1983 case 'L': 1984 show_cert = 1; 1985 break; 1986 case 'l': 1987 print_fingerprint = 1; 1988 break; 1989 case 'B': 1990 print_bubblebabble = 1; 1991 break; 1992 case 'm': 1993 if (strcasecmp(optarg, "RFC4716") == 0 || 1994 strcasecmp(optarg, "ssh2") == 0) { 1995 convert_format = FMT_RFC4716; 1996 break; 1997 } 1998 if (strcasecmp(optarg, "PKCS8") == 0) { 1999 convert_format = FMT_PKCS8; 2000 break; 2001 } 2002 if (strcasecmp(optarg, "PEM") == 0) { 2003 convert_format = FMT_PEM; 2004 break; 2005 } 2006 fatal("Unsupported conversion format \"%s\"", optarg); 2007 case 'n': 2008 cert_principals = optarg; 2009 break; 2010 case 'p': 2011 change_passphrase = 1; 2012 break; 2013 case 'c': 2014 change_comment = 1; 2015 break; 2016 case 'f': 2017 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= 2018 sizeof(identity_file)) 2019 fatal("Identity filename too long"); 2020 have_identity = 1; 2021 break; 2022 case 'g': 2023 print_generic = 1; 2024 break; 2025 case 'P': 2026 identity_passphrase = optarg; 2027 break; 2028 case 'N': 2029 identity_new_passphrase = optarg; 2030 break; 2031 case 'O': 2032 add_cert_option(optarg); 2033 break; 2034 case 'C': 2035 identity_comment = optarg; 2036 break; 2037 case 'q': 2038 quiet = 1; 2039 break; 2040 case 'e': 2041 case 'x': 2042 /* export key */ 2043 convert_to = 1; 2044 break; 2045 case 'h': 2046 cert_key_type = SSH2_CERT_TYPE_HOST; 2047 certflags_flags = 0; 2048 break; 2049 case 'i': 2050 case 'X': 2051 /* import key */ 2052 convert_from = 1; 2053 break; 2054 case 'y': 2055 print_public = 1; 2056 break; 2057 case 's': 2058 ca_key_path = optarg; 2059 break; 2060 case 't': 2061 key_type_name = optarg; 2062 break; 2063 case 'D': 2064 pkcs11provider = optarg; 2065 break; 2066 case 'v': 2067 if (log_level == SYSLOG_LEVEL_INFO) 2068 log_level = SYSLOG_LEVEL_DEBUG1; 2069 else { 2070 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2071 log_level < SYSLOG_LEVEL_DEBUG3) 2072 log_level++; 2073 } 2074 break; 2075 case 'r': 2076 rr_hostname = optarg; 2077 break; 2078 case 'W': 2079 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2080 UINT_MAX, &errstr); 2081 if (errstr) 2082 fatal("Desired generator has bad value: %s (%s)", 2083 optarg, errstr); 2084 break; 2085 case 'a': 2086 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2087 if (errstr) 2088 fatal("Invalid number of trials: %s (%s)", 2089 optarg, errstr); 2090 break; 2091 case 'M': 2092 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2093 if (errstr) 2094 fatal("Memory limit is %s: %s", errstr, optarg); 2095 break; 2096 case 'G': 2097 do_gen_candidates = 1; 2098 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2099 sizeof(out_file)) 2100 fatal("Output filename too long"); 2101 break; 2102 case 'T': 2103 do_screen_candidates = 1; 2104 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2105 sizeof(out_file)) 2106 fatal("Output filename too long"); 2107 break; 2108 case 'K': 2109 if (strlen(optarg) >= MAXPATHLEN) 2110 fatal("Checkpoint filename too long"); 2111 checkpoint = xstrdup(optarg); 2112 break; 2113 case 'S': 2114 /* XXX - also compare length against bits */ 2115 if (BN_hex2bn(&start, optarg) == 0) 2116 fatal("Invalid start point."); 2117 break; 2118 case 'V': 2119 parse_cert_times(optarg); 2120 break; 2121 case 'z': 2122 cert_serial = strtonum(optarg, 0, LLONG_MAX, &errstr); 2123 if (errstr) 2124 fatal("Invalid serial number: %s", errstr); 2125 break; 2126 case '?': 2127 default: 2128 usage(); 2129 } 2130 } 2131 2132 /* reinit */ 2133 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2134 2135 argv += optind; 2136 argc -= optind; 2137 2138 if (ca_key_path != NULL) { 2139 if (argc < 1) { 2140 printf("Too few arguments.\n"); 2141 usage(); 2142 } 2143 } else if (argc > 0) { 2144 printf("Too many arguments.\n"); 2145 usage(); 2146 } 2147 if (change_passphrase && change_comment) { 2148 printf("Can only have one of -p and -c.\n"); 2149 usage(); 2150 } 2151 if (print_fingerprint && (delete_host || hash_hosts)) { 2152 printf("Cannot use -l with -D or -R.\n"); 2153 usage(); 2154 } 2155 if (ca_key_path != NULL) { 2156 if (cert_key_id == NULL) 2157 fatal("Must specify key id (-I) when certifying"); 2158 do_ca_sign(pw, argc, argv); 2159 } 2160 if (show_cert) 2161 do_show_cert(pw); 2162 if (delete_host || hash_hosts || find_host) 2163 do_known_hosts(pw, rr_hostname); 2164 if (print_fingerprint || print_bubblebabble) 2165 do_fingerprint(pw); 2166 if (change_passphrase) 2167 do_change_passphrase(pw); 2168 if (change_comment) 2169 do_change_comment(pw); 2170 if (convert_to) 2171 do_convert_to(pw); 2172 if (convert_from) 2173 do_convert_from(pw); 2174 if (print_public) 2175 do_print_public(pw); 2176 if (rr_hostname != NULL) { 2177 unsigned int n = 0; 2178 2179 if (have_identity) { 2180 n = do_print_resource_record(pw, 2181 identity_file, rr_hostname); 2182 if (n == 0) { 2183 perror(identity_file); 2184 exit(1); 2185 } 2186 exit(0); 2187 } else { 2188 2189 n += do_print_resource_record(pw, 2190 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2191 n += do_print_resource_record(pw, 2192 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2193 n += do_print_resource_record(pw, 2194 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname); 2195 2196 if (n == 0) 2197 fatal("no keys found."); 2198 exit(0); 2199 } 2200 } 2201 if (pkcs11provider != NULL) 2202 do_download(pw); 2203 2204 if (do_gen_candidates) { 2205 FILE *out = fopen(out_file, "w"); 2206 2207 if (out == NULL) { 2208 error("Couldn't open modulus candidate file \"%s\": %s", 2209 out_file, strerror(errno)); 2210 return (1); 2211 } 2212 if (bits == 0) 2213 bits = DEFAULT_BITS; 2214 if (gen_candidates(out, memory, bits, start) != 0) 2215 fatal("modulus candidate generation failed"); 2216 2217 return (0); 2218 } 2219 2220 if (do_screen_candidates) { 2221 FILE *in; 2222 FILE *out = fopen(out_file, "w"); 2223 2224 if (have_identity && strcmp(identity_file, "-") != 0) { 2225 if ((in = fopen(identity_file, "r")) == NULL) { 2226 fatal("Couldn't open modulus candidate " 2227 "file \"%s\": %s", identity_file, 2228 strerror(errno)); 2229 } 2230 } else 2231 in = stdin; 2232 2233 if (out == NULL) { 2234 fatal("Couldn't open moduli file \"%s\": %s", 2235 out_file, strerror(errno)); 2236 } 2237 if (prime_test(in, out, trials, generator_wanted, checkpoint, 2238 start_lineno, lines_to_process) != 0) 2239 fatal("modulus screening failed"); 2240 return (0); 2241 } 2242 2243 if (gen_all_hostkeys) { 2244 do_gen_all_hostkeys(pw); 2245 return (0); 2246 } 2247 2248 arc4random_stir(); 2249 2250 if (key_type_name == NULL) 2251 key_type_name = "rsa"; 2252 2253 type = key_type_from_name(key_type_name); 2254 type_bits_valid(type, &bits); 2255 2256 if (!quiet) 2257 printf("Generating public/private %s key pair.\n", key_type_name); 2258 private = key_generate(type, bits); 2259 if (private == NULL) { 2260 fprintf(stderr, "key_generate failed\n"); 2261 exit(1); 2262 } 2263 public = key_from_private(private); 2264 2265 if (!have_identity) 2266 ask_filename(pw, "Enter file in which to save the key"); 2267 2268 /* Create ~/.ssh directory if it doesn't already exist. */ 2269 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2270 pw->pw_dir, _PATH_SSH_USER_DIR); 2271 if (strstr(identity_file, dotsshdir) != NULL) { 2272 if (stat(dotsshdir, &st) < 0) { 2273 if (errno != ENOENT) { 2274 error("Could not stat %s: %s", dotsshdir, 2275 strerror(errno)); 2276 } else if (mkdir(dotsshdir, 0700) < 0) { 2277 error("Could not create directory '%s': %s", 2278 dotsshdir, strerror(errno)); 2279 } else if (!quiet) 2280 printf("Created directory '%s'.\n", dotsshdir); 2281 } 2282 } 2283 /* If the file already exists, ask the user to confirm. */ 2284 if (stat(identity_file, &st) >= 0) { 2285 char yesno[3]; 2286 printf("%s already exists.\n", identity_file); 2287 printf("Overwrite (y/n)? "); 2288 fflush(stdout); 2289 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2290 exit(1); 2291 if (yesno[0] != 'y' && yesno[0] != 'Y') 2292 exit(1); 2293 } 2294 /* Ask for a passphrase (twice). */ 2295 if (identity_passphrase) 2296 passphrase1 = xstrdup(identity_passphrase); 2297 else if (identity_new_passphrase) 2298 passphrase1 = xstrdup(identity_new_passphrase); 2299 else { 2300 passphrase_again: 2301 passphrase1 = 2302 read_passphrase("Enter passphrase (empty for no " 2303 "passphrase): ", RP_ALLOW_STDIN); 2304 passphrase2 = read_passphrase("Enter same passphrase again: ", 2305 RP_ALLOW_STDIN); 2306 if (strcmp(passphrase1, passphrase2) != 0) { 2307 /* 2308 * The passphrases do not match. Clear them and 2309 * retry. 2310 */ 2311 memset(passphrase1, 0, strlen(passphrase1)); 2312 memset(passphrase2, 0, strlen(passphrase2)); 2313 xfree(passphrase1); 2314 xfree(passphrase2); 2315 printf("Passphrases do not match. Try again.\n"); 2316 goto passphrase_again; 2317 } 2318 /* Clear the other copy of the passphrase. */ 2319 memset(passphrase2, 0, strlen(passphrase2)); 2320 xfree(passphrase2); 2321 } 2322 2323 if (identity_comment) { 2324 strlcpy(comment, identity_comment, sizeof(comment)); 2325 } else { 2326 /* Create default comment field for the passphrase. */ 2327 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2328 } 2329 2330 /* Save the key with the given passphrase and comment. */ 2331 if (!key_save_private(private, identity_file, passphrase1, comment)) { 2332 printf("Saving the key failed: %s.\n", identity_file); 2333 memset(passphrase1, 0, strlen(passphrase1)); 2334 xfree(passphrase1); 2335 exit(1); 2336 } 2337 /* Clear the passphrase. */ 2338 memset(passphrase1, 0, strlen(passphrase1)); 2339 xfree(passphrase1); 2340 2341 /* Clear the private key and the random number generator. */ 2342 key_free(private); 2343 arc4random_stir(); 2344 2345 if (!quiet) 2346 printf("Your identification has been saved in %s.\n", identity_file); 2347 2348 strlcat(identity_file, ".pub", sizeof(identity_file)); 2349 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 2350 if (fd == -1) { 2351 printf("Could not save your public key in %s\n", identity_file); 2352 exit(1); 2353 } 2354 f = fdopen(fd, "w"); 2355 if (f == NULL) { 2356 printf("fdopen %s failed\n", identity_file); 2357 exit(1); 2358 } 2359 if (!key_write(public, f)) 2360 fprintf(stderr, "write key failed\n"); 2361 fprintf(f, " %s\n", comment); 2362 fclose(f); 2363 2364 if (!quiet) { 2365 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 2366 char *ra = key_fingerprint(public, SSH_FP_MD5, 2367 SSH_FP_RANDOMART); 2368 printf("Your public key has been saved in %s.\n", 2369 identity_file); 2370 printf("The key fingerprint is:\n"); 2371 printf("%s %s\n", fp, comment); 2372 printf("The key's randomart image is:\n"); 2373 printf("%s\n", ra); 2374 xfree(ra); 2375 xfree(fp); 2376 } 2377 2378 key_free(public); 2379 exit(0); 2380 } 2381