ssh-keygen.c revision 251135
1/* $OpenBSD: ssh-keygen.c,v 1.225 2013/02/10 23:32:10 djm Exp $ */ 2/* 3 * Author: Tatu Ylonen <ylo@cs.hut.fi> 4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * Identity and host key generation and maintenance. 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 */ 14 15#include "includes.h" 16 17#include <sys/types.h> 18#include <sys/socket.h> 19#include <sys/stat.h> 20#include <sys/param.h> 21 22#include <openssl/evp.h> 23#include <openssl/pem.h> 24#include "openbsd-compat/openssl-compat.h" 25 26#include <errno.h> 27#include <fcntl.h> 28#include <netdb.h> 29#ifdef HAVE_PATHS_H 30# include <paths.h> 31#endif 32#include <pwd.h> 33#include <stdarg.h> 34#include <stdio.h> 35#include <stdlib.h> 36#include <string.h> 37#include <unistd.h> 38 39#include "xmalloc.h" 40#include "key.h" 41#include "rsa.h" 42#include "authfile.h" 43#include "uuencode.h" 44#include "buffer.h" 45#include "pathnames.h" 46#include "log.h" 47#include "misc.h" 48#include "match.h" 49#include "hostfile.h" 50#include "dns.h" 51#include "ssh.h" 52#include "ssh2.h" 53#include "ssh-pkcs11.h" 54#include "atomicio.h" 55#include "krl.h" 56 57/* Number of bits in the RSA/DSA key. This value can be set on the command line. */ 58#define DEFAULT_BITS 2048 59#define DEFAULT_BITS_DSA 1024 60#define DEFAULT_BITS_ECDSA 256 61u_int32_t bits = 0; 62 63/* 64 * Flag indicating that we just want to change the passphrase. This can be 65 * set on the command line. 66 */ 67int change_passphrase = 0; 68 69/* 70 * Flag indicating that we just want to change the comment. This can be set 71 * on the command line. 72 */ 73int change_comment = 0; 74 75int quiet = 0; 76 77int log_level = SYSLOG_LEVEL_INFO; 78 79/* Flag indicating that we want to hash a known_hosts file */ 80int hash_hosts = 0; 81/* Flag indicating that we want lookup a host in known_hosts file */ 82int find_host = 0; 83/* Flag indicating that we want to delete a host from a known_hosts file */ 84int delete_host = 0; 85 86/* Flag indicating that we want to show the contents of a certificate */ 87int show_cert = 0; 88 89/* Flag indicating that we just want to see the key fingerprint */ 90int print_fingerprint = 0; 91int print_bubblebabble = 0; 92 93/* The identity file name, given on the command line or entered by the user. */ 94char identity_file[1024]; 95int have_identity = 0; 96 97/* This is set to the passphrase if given on the command line. */ 98char *identity_passphrase = NULL; 99 100/* This is set to the new passphrase if given on the command line. */ 101char *identity_new_passphrase = NULL; 102 103/* This is set to the new comment if given on the command line. */ 104char *identity_comment = NULL; 105 106/* Path to CA key when certifying keys. */ 107char *ca_key_path = NULL; 108 109/* Certificate serial number */ 110unsigned long long cert_serial = 0; 111 112/* Key type when certifying */ 113u_int cert_key_type = SSH2_CERT_TYPE_USER; 114 115/* "key ID" of signed key */ 116char *cert_key_id = NULL; 117 118/* Comma-separated list of principal names for certifying keys */ 119char *cert_principals = NULL; 120 121/* Validity period for certificates */ 122u_int64_t cert_valid_from = 0; 123u_int64_t cert_valid_to = ~0ULL; 124 125/* Certificate options */ 126#define CERTOPT_X_FWD (1) 127#define CERTOPT_AGENT_FWD (1<<1) 128#define CERTOPT_PORT_FWD (1<<2) 129#define CERTOPT_PTY (1<<3) 130#define CERTOPT_USER_RC (1<<4) 131#define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 132 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 133u_int32_t certflags_flags = CERTOPT_DEFAULT; 134char *certflags_command = NULL; 135char *certflags_src_addr = NULL; 136 137/* Conversion to/from various formats */ 138int convert_to = 0; 139int convert_from = 0; 140enum { 141 FMT_RFC4716, 142 FMT_PKCS8, 143 FMT_PEM 144} convert_format = FMT_RFC4716; 145int print_public = 0; 146int print_generic = 0; 147 148char *key_type_name = NULL; 149 150/* Load key from this PKCS#11 provider */ 151char *pkcs11provider = NULL; 152 153/* argv0 */ 154extern char *__progname; 155 156char hostname[MAXHOSTNAMELEN]; 157 158/* moduli.c */ 159int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 160int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 161 unsigned long); 162 163static void 164type_bits_valid(int type, u_int32_t *bitsp) 165{ 166 u_int maxbits; 167 168 if (type == KEY_UNSPEC) { 169 fprintf(stderr, "unknown key type %s\n", key_type_name); 170 exit(1); 171 } 172 if (*bitsp == 0) { 173 if (type == KEY_DSA) 174 *bitsp = DEFAULT_BITS_DSA; 175 else if (type == KEY_ECDSA) 176 *bitsp = DEFAULT_BITS_ECDSA; 177 else 178 *bitsp = DEFAULT_BITS; 179 } 180 maxbits = (type == KEY_DSA) ? 181 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 182 if (*bitsp > maxbits) { 183 fprintf(stderr, "key bits exceeds maximum %d\n", maxbits); 184 exit(1); 185 } 186 if (type == KEY_DSA && *bitsp != 1024) 187 fatal("DSA keys must be 1024 bits"); 188 else if (type != KEY_ECDSA && *bitsp < 768) 189 fatal("Key must at least be 768 bits"); 190 else if (type == KEY_ECDSA && key_ecdsa_bits_to_nid(*bitsp) == -1) 191 fatal("Invalid ECDSA key length - valid lengths are " 192 "256, 384 or 521 bits"); 193} 194 195static void 196ask_filename(struct passwd *pw, const char *prompt) 197{ 198 char buf[1024]; 199 char *name = NULL; 200 201 if (key_type_name == NULL) 202 name = _PATH_SSH_CLIENT_ID_RSA; 203 else { 204 switch (key_type_from_name(key_type_name)) { 205 case KEY_RSA1: 206 name = _PATH_SSH_CLIENT_IDENTITY; 207 break; 208 case KEY_DSA_CERT: 209 case KEY_DSA_CERT_V00: 210 case KEY_DSA: 211 name = _PATH_SSH_CLIENT_ID_DSA; 212 break; 213#ifdef OPENSSL_HAS_ECC 214 case KEY_ECDSA_CERT: 215 case KEY_ECDSA: 216 name = _PATH_SSH_CLIENT_ID_ECDSA; 217 break; 218#endif 219 case KEY_RSA_CERT: 220 case KEY_RSA_CERT_V00: 221 case KEY_RSA: 222 name = _PATH_SSH_CLIENT_ID_RSA; 223 break; 224 default: 225 fprintf(stderr, "bad key type\n"); 226 exit(1); 227 break; 228 } 229 } 230 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 231 fprintf(stderr, "%s (%s): ", prompt, identity_file); 232 if (fgets(buf, sizeof(buf), stdin) == NULL) 233 exit(1); 234 buf[strcspn(buf, "\n")] = '\0'; 235 if (strcmp(buf, "") != 0) 236 strlcpy(identity_file, buf, sizeof(identity_file)); 237 have_identity = 1; 238} 239 240static Key * 241load_identity(char *filename) 242{ 243 char *pass; 244 Key *prv; 245 246 prv = key_load_private(filename, "", NULL); 247 if (prv == NULL) { 248 if (identity_passphrase) 249 pass = xstrdup(identity_passphrase); 250 else 251 pass = read_passphrase("Enter passphrase: ", 252 RP_ALLOW_STDIN); 253 prv = key_load_private(filename, pass, NULL); 254 memset(pass, 0, strlen(pass)); 255 xfree(pass); 256 } 257 return prv; 258} 259 260#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 261#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 262#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 263#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 264 265static void 266do_convert_to_ssh2(struct passwd *pw, Key *k) 267{ 268 u_int len; 269 u_char *blob; 270 char comment[61]; 271 272 if (k->type == KEY_RSA1) { 273 fprintf(stderr, "version 1 keys are not supported\n"); 274 exit(1); 275 } 276 if (key_to_blob(k, &blob, &len) <= 0) { 277 fprintf(stderr, "key_to_blob failed\n"); 278 exit(1); 279 } 280 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 281 snprintf(comment, sizeof(comment), 282 "%u-bit %s, converted by %s@%s from OpenSSH", 283 key_size(k), key_type(k), 284 pw->pw_name, hostname); 285 286 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 287 fprintf(stdout, "Comment: \"%s\"\n", comment); 288 dump_base64(stdout, blob, len); 289 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 290 key_free(k); 291 xfree(blob); 292 exit(0); 293} 294 295static void 296do_convert_to_pkcs8(Key *k) 297{ 298 switch (key_type_plain(k->type)) { 299 case KEY_RSA1: 300 case KEY_RSA: 301 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 302 fatal("PEM_write_RSA_PUBKEY failed"); 303 break; 304 case KEY_DSA: 305 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 306 fatal("PEM_write_DSA_PUBKEY failed"); 307 break; 308#ifdef OPENSSL_HAS_ECC 309 case KEY_ECDSA: 310 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 311 fatal("PEM_write_EC_PUBKEY failed"); 312 break; 313#endif 314 default: 315 fatal("%s: unsupported key type %s", __func__, key_type(k)); 316 } 317 exit(0); 318} 319 320static void 321do_convert_to_pem(Key *k) 322{ 323 switch (key_type_plain(k->type)) { 324 case KEY_RSA1: 325 case KEY_RSA: 326 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 327 fatal("PEM_write_RSAPublicKey failed"); 328 break; 329#if notyet /* OpenSSH 0.9.8 lacks this function */ 330 case KEY_DSA: 331 if (!PEM_write_DSAPublicKey(stdout, k->dsa)) 332 fatal("PEM_write_DSAPublicKey failed"); 333 break; 334#endif 335 /* XXX ECDSA? */ 336 default: 337 fatal("%s: unsupported key type %s", __func__, key_type(k)); 338 } 339 exit(0); 340} 341 342static void 343do_convert_to(struct passwd *pw) 344{ 345 Key *k; 346 struct stat st; 347 348 if (!have_identity) 349 ask_filename(pw, "Enter file in which the key is"); 350 if (stat(identity_file, &st) < 0) 351 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 352 if ((k = key_load_public(identity_file, NULL)) == NULL) { 353 if ((k = load_identity(identity_file)) == NULL) { 354 fprintf(stderr, "load failed\n"); 355 exit(1); 356 } 357 } 358 359 switch (convert_format) { 360 case FMT_RFC4716: 361 do_convert_to_ssh2(pw, k); 362 break; 363 case FMT_PKCS8: 364 do_convert_to_pkcs8(k); 365 break; 366 case FMT_PEM: 367 do_convert_to_pem(k); 368 break; 369 default: 370 fatal("%s: unknown key format %d", __func__, convert_format); 371 } 372 exit(0); 373} 374 375static void 376buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 377{ 378 u_int bignum_bits = buffer_get_int(b); 379 u_int bytes = (bignum_bits + 7) / 8; 380 381 if (buffer_len(b) < bytes) 382 fatal("buffer_get_bignum_bits: input buffer too small: " 383 "need %d have %d", bytes, buffer_len(b)); 384 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL) 385 fatal("buffer_get_bignum_bits: BN_bin2bn failed"); 386 buffer_consume(b, bytes); 387} 388 389static Key * 390do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 391{ 392 Buffer b; 393 Key *key = NULL; 394 char *type, *cipher; 395 u_char *sig, data[] = "abcde12345"; 396 int magic, rlen, ktype, i1, i2, i3, i4; 397 u_int slen; 398 u_long e; 399 400 buffer_init(&b); 401 buffer_append(&b, blob, blen); 402 403 magic = buffer_get_int(&b); 404 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 405 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 406 buffer_free(&b); 407 return NULL; 408 } 409 i1 = buffer_get_int(&b); 410 type = buffer_get_string(&b, NULL); 411 cipher = buffer_get_string(&b, NULL); 412 i2 = buffer_get_int(&b); 413 i3 = buffer_get_int(&b); 414 i4 = buffer_get_int(&b); 415 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 416 if (strcmp(cipher, "none") != 0) { 417 error("unsupported cipher %s", cipher); 418 xfree(cipher); 419 buffer_free(&b); 420 xfree(type); 421 return NULL; 422 } 423 xfree(cipher); 424 425 if (strstr(type, "dsa")) { 426 ktype = KEY_DSA; 427 } else if (strstr(type, "rsa")) { 428 ktype = KEY_RSA; 429 } else { 430 buffer_free(&b); 431 xfree(type); 432 return NULL; 433 } 434 key = key_new_private(ktype); 435 xfree(type); 436 437 switch (key->type) { 438 case KEY_DSA: 439 buffer_get_bignum_bits(&b, key->dsa->p); 440 buffer_get_bignum_bits(&b, key->dsa->g); 441 buffer_get_bignum_bits(&b, key->dsa->q); 442 buffer_get_bignum_bits(&b, key->dsa->pub_key); 443 buffer_get_bignum_bits(&b, key->dsa->priv_key); 444 break; 445 case KEY_RSA: 446 e = buffer_get_char(&b); 447 debug("e %lx", e); 448 if (e < 30) { 449 e <<= 8; 450 e += buffer_get_char(&b); 451 debug("e %lx", e); 452 e <<= 8; 453 e += buffer_get_char(&b); 454 debug("e %lx", e); 455 } 456 if (!BN_set_word(key->rsa->e, e)) { 457 buffer_free(&b); 458 key_free(key); 459 return NULL; 460 } 461 buffer_get_bignum_bits(&b, key->rsa->d); 462 buffer_get_bignum_bits(&b, key->rsa->n); 463 buffer_get_bignum_bits(&b, key->rsa->iqmp); 464 buffer_get_bignum_bits(&b, key->rsa->q); 465 buffer_get_bignum_bits(&b, key->rsa->p); 466 rsa_generate_additional_parameters(key->rsa); 467 break; 468 } 469 rlen = buffer_len(&b); 470 if (rlen != 0) 471 error("do_convert_private_ssh2_from_blob: " 472 "remaining bytes in key blob %d", rlen); 473 buffer_free(&b); 474 475 /* try the key */ 476 key_sign(key, &sig, &slen, data, sizeof(data)); 477 key_verify(key, sig, slen, data, sizeof(data)); 478 xfree(sig); 479 return key; 480} 481 482static int 483get_line(FILE *fp, char *line, size_t len) 484{ 485 int c; 486 size_t pos = 0; 487 488 line[0] = '\0'; 489 while ((c = fgetc(fp)) != EOF) { 490 if (pos >= len - 1) { 491 fprintf(stderr, "input line too long.\n"); 492 exit(1); 493 } 494 switch (c) { 495 case '\r': 496 c = fgetc(fp); 497 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { 498 fprintf(stderr, "unget: %s\n", strerror(errno)); 499 exit(1); 500 } 501 return pos; 502 case '\n': 503 return pos; 504 } 505 line[pos++] = c; 506 line[pos] = '\0'; 507 } 508 /* We reached EOF */ 509 return -1; 510} 511 512static void 513do_convert_from_ssh2(struct passwd *pw, Key **k, int *private) 514{ 515 int blen; 516 u_int len; 517 char line[1024]; 518 u_char blob[8096]; 519 char encoded[8096]; 520 int escaped = 0; 521 FILE *fp; 522 523 if ((fp = fopen(identity_file, "r")) == NULL) 524 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 525 encoded[0] = '\0'; 526 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 527 if (line[blen - 1] == '\\') 528 escaped++; 529 if (strncmp(line, "----", 4) == 0 || 530 strstr(line, ": ") != NULL) { 531 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 532 *private = 1; 533 if (strstr(line, " END ") != NULL) { 534 break; 535 } 536 /* fprintf(stderr, "ignore: %s", line); */ 537 continue; 538 } 539 if (escaped) { 540 escaped--; 541 /* fprintf(stderr, "escaped: %s", line); */ 542 continue; 543 } 544 strlcat(encoded, line, sizeof(encoded)); 545 } 546 len = strlen(encoded); 547 if (((len % 4) == 3) && 548 (encoded[len-1] == '=') && 549 (encoded[len-2] == '=') && 550 (encoded[len-3] == '=')) 551 encoded[len-3] = '\0'; 552 blen = uudecode(encoded, blob, sizeof(blob)); 553 if (blen < 0) { 554 fprintf(stderr, "uudecode failed.\n"); 555 exit(1); 556 } 557 *k = *private ? 558 do_convert_private_ssh2_from_blob(blob, blen) : 559 key_from_blob(blob, blen); 560 if (*k == NULL) { 561 fprintf(stderr, "decode blob failed.\n"); 562 exit(1); 563 } 564 fclose(fp); 565} 566 567static void 568do_convert_from_pkcs8(Key **k, int *private) 569{ 570 EVP_PKEY *pubkey; 571 FILE *fp; 572 573 if ((fp = fopen(identity_file, "r")) == NULL) 574 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 575 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 576 fatal("%s: %s is not a recognised public key format", __func__, 577 identity_file); 578 } 579 fclose(fp); 580 switch (EVP_PKEY_type(pubkey->type)) { 581 case EVP_PKEY_RSA: 582 *k = key_new(KEY_UNSPEC); 583 (*k)->type = KEY_RSA; 584 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 585 break; 586 case EVP_PKEY_DSA: 587 *k = key_new(KEY_UNSPEC); 588 (*k)->type = KEY_DSA; 589 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 590 break; 591#ifdef OPENSSL_HAS_ECC 592 case EVP_PKEY_EC: 593 *k = key_new(KEY_UNSPEC); 594 (*k)->type = KEY_ECDSA; 595 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 596 (*k)->ecdsa_nid = key_ecdsa_key_to_nid((*k)->ecdsa); 597 break; 598#endif 599 default: 600 fatal("%s: unsupported pubkey type %d", __func__, 601 EVP_PKEY_type(pubkey->type)); 602 } 603 EVP_PKEY_free(pubkey); 604 return; 605} 606 607static void 608do_convert_from_pem(Key **k, int *private) 609{ 610 FILE *fp; 611 RSA *rsa; 612#ifdef notyet 613 DSA *dsa; 614#endif 615 616 if ((fp = fopen(identity_file, "r")) == NULL) 617 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 618 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 619 *k = key_new(KEY_UNSPEC); 620 (*k)->type = KEY_RSA; 621 (*k)->rsa = rsa; 622 fclose(fp); 623 return; 624 } 625#if notyet /* OpenSSH 0.9.8 lacks this function */ 626 rewind(fp); 627 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 628 *k = key_new(KEY_UNSPEC); 629 (*k)->type = KEY_DSA; 630 (*k)->dsa = dsa; 631 fclose(fp); 632 return; 633 } 634 /* XXX ECDSA */ 635#endif 636 fatal("%s: unrecognised raw private key format", __func__); 637} 638 639static void 640do_convert_from(struct passwd *pw) 641{ 642 Key *k = NULL; 643 int private = 0, ok = 0; 644 struct stat st; 645 646 if (!have_identity) 647 ask_filename(pw, "Enter file in which the key is"); 648 if (stat(identity_file, &st) < 0) 649 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 650 651 switch (convert_format) { 652 case FMT_RFC4716: 653 do_convert_from_ssh2(pw, &k, &private); 654 break; 655 case FMT_PKCS8: 656 do_convert_from_pkcs8(&k, &private); 657 break; 658 case FMT_PEM: 659 do_convert_from_pem(&k, &private); 660 break; 661 default: 662 fatal("%s: unknown key format %d", __func__, convert_format); 663 } 664 665 if (!private) 666 ok = key_write(k, stdout); 667 if (ok) 668 fprintf(stdout, "\n"); 669 else { 670 switch (k->type) { 671 case KEY_DSA: 672 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 673 NULL, 0, NULL, NULL); 674 break; 675#ifdef OPENSSL_HAS_ECC 676 case KEY_ECDSA: 677 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 678 NULL, 0, NULL, NULL); 679 break; 680#endif 681 case KEY_RSA: 682 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 683 NULL, 0, NULL, NULL); 684 break; 685 default: 686 fatal("%s: unsupported key type %s", __func__, 687 key_type(k)); 688 } 689 } 690 691 if (!ok) { 692 fprintf(stderr, "key write failed\n"); 693 exit(1); 694 } 695 key_free(k); 696 exit(0); 697} 698 699static void 700do_print_public(struct passwd *pw) 701{ 702 Key *prv; 703 struct stat st; 704 705 if (!have_identity) 706 ask_filename(pw, "Enter file in which the key is"); 707 if (stat(identity_file, &st) < 0) { 708 perror(identity_file); 709 exit(1); 710 } 711 prv = load_identity(identity_file); 712 if (prv == NULL) { 713 fprintf(stderr, "load failed\n"); 714 exit(1); 715 } 716 if (!key_write(prv, stdout)) 717 fprintf(stderr, "key_write failed"); 718 key_free(prv); 719 fprintf(stdout, "\n"); 720 exit(0); 721} 722 723static void 724do_download(struct passwd *pw) 725{ 726#ifdef ENABLE_PKCS11 727 Key **keys = NULL; 728 int i, nkeys; 729 enum fp_rep rep; 730 enum fp_type fptype; 731 char *fp, *ra; 732 733 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 734 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 735 736 pkcs11_init(0); 737 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 738 if (nkeys <= 0) 739 fatal("cannot read public key from pkcs11"); 740 for (i = 0; i < nkeys; i++) { 741 if (print_fingerprint) { 742 fp = key_fingerprint(keys[i], fptype, rep); 743 ra = key_fingerprint(keys[i], SSH_FP_MD5, 744 SSH_FP_RANDOMART); 745 printf("%u %s %s (PKCS11 key)\n", key_size(keys[i]), 746 fp, key_type(keys[i])); 747 if (log_level >= SYSLOG_LEVEL_VERBOSE) 748 printf("%s\n", ra); 749 xfree(ra); 750 xfree(fp); 751 } else { 752 key_write(keys[i], stdout); 753 fprintf(stdout, "\n"); 754 } 755 key_free(keys[i]); 756 } 757 xfree(keys); 758 pkcs11_terminate(); 759 exit(0); 760#else 761 fatal("no pkcs11 support"); 762#endif /* ENABLE_PKCS11 */ 763} 764 765static void 766do_fingerprint(struct passwd *pw) 767{ 768 FILE *f; 769 Key *public; 770 char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra; 771 int i, skip = 0, num = 0, invalid = 1; 772 enum fp_rep rep; 773 enum fp_type fptype; 774 struct stat st; 775 776 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 777 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 778 779 if (!have_identity) 780 ask_filename(pw, "Enter file in which the key is"); 781 if (stat(identity_file, &st) < 0) { 782 perror(identity_file); 783 exit(1); 784 } 785 public = key_load_public(identity_file, &comment); 786 if (public != NULL) { 787 fp = key_fingerprint(public, fptype, rep); 788 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 789 printf("%u %s %s (%s)\n", key_size(public), fp, comment, 790 key_type(public)); 791 if (log_level >= SYSLOG_LEVEL_VERBOSE) 792 printf("%s\n", ra); 793 key_free(public); 794 xfree(comment); 795 xfree(ra); 796 xfree(fp); 797 exit(0); 798 } 799 if (comment) { 800 xfree(comment); 801 comment = NULL; 802 } 803 804 if ((f = fopen(identity_file, "r")) == NULL) 805 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 806 807 while (fgets(line, sizeof(line), f)) { 808 if ((cp = strchr(line, '\n')) == NULL) { 809 error("line %d too long: %.40s...", 810 num + 1, line); 811 skip = 1; 812 continue; 813 } 814 num++; 815 if (skip) { 816 skip = 0; 817 continue; 818 } 819 *cp = '\0'; 820 821 /* Skip leading whitespace, empty and comment lines. */ 822 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 823 ; 824 if (!*cp || *cp == '\n' || *cp == '#') 825 continue; 826 i = strtol(cp, &ep, 10); 827 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 828 int quoted = 0; 829 comment = cp; 830 for (; *cp && (quoted || (*cp != ' ' && 831 *cp != '\t')); cp++) { 832 if (*cp == '\\' && cp[1] == '"') 833 cp++; /* Skip both */ 834 else if (*cp == '"') 835 quoted = !quoted; 836 } 837 if (!*cp) 838 continue; 839 *cp++ = '\0'; 840 } 841 ep = cp; 842 public = key_new(KEY_RSA1); 843 if (key_read(public, &cp) != 1) { 844 cp = ep; 845 key_free(public); 846 public = key_new(KEY_UNSPEC); 847 if (key_read(public, &cp) != 1) { 848 key_free(public); 849 continue; 850 } 851 } 852 comment = *cp ? cp : comment; 853 fp = key_fingerprint(public, fptype, rep); 854 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 855 printf("%u %s %s (%s)\n", key_size(public), fp, 856 comment ? comment : "no comment", key_type(public)); 857 if (log_level >= SYSLOG_LEVEL_VERBOSE) 858 printf("%s\n", ra); 859 xfree(ra); 860 xfree(fp); 861 key_free(public); 862 invalid = 0; 863 } 864 fclose(f); 865 866 if (invalid) { 867 printf("%s is not a public key file.\n", identity_file); 868 exit(1); 869 } 870 exit(0); 871} 872 873static void 874do_gen_all_hostkeys(struct passwd *pw) 875{ 876 struct { 877 char *key_type; 878 char *key_type_display; 879 char *path; 880 } key_types[] = { 881 { "rsa1", "RSA1", _PATH_HOST_KEY_FILE }, 882 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 883 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 884#ifdef OPENSSL_HAS_ECC 885 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 886#endif 887 { NULL, NULL, NULL } 888 }; 889 890 int first = 0; 891 struct stat st; 892 Key *private, *public; 893 char comment[1024]; 894 int i, type, fd; 895 FILE *f; 896 897 for (i = 0; key_types[i].key_type; i++) { 898 if (stat(key_types[i].path, &st) == 0) 899 continue; 900 if (errno != ENOENT) { 901 printf("Could not stat %s: %s", key_types[i].path, 902 strerror(errno)); 903 first = 0; 904 continue; 905 } 906 907 if (first == 0) { 908 first = 1; 909 printf("%s: generating new host keys: ", __progname); 910 } 911 printf("%s ", key_types[i].key_type_display); 912 fflush(stdout); 913 arc4random_stir(); 914 type = key_type_from_name(key_types[i].key_type); 915 strlcpy(identity_file, key_types[i].path, sizeof(identity_file)); 916 bits = 0; 917 type_bits_valid(type, &bits); 918 private = key_generate(type, bits); 919 if (private == NULL) { 920 fprintf(stderr, "key_generate failed\n"); 921 first = 0; 922 continue; 923 } 924 public = key_from_private(private); 925 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 926 hostname); 927 if (!key_save_private(private, identity_file, "", comment)) { 928 printf("Saving the key failed: %s.\n", identity_file); 929 key_free(private); 930 key_free(public); 931 first = 0; 932 continue; 933 } 934 key_free(private); 935 arc4random_stir(); 936 strlcat(identity_file, ".pub", sizeof(identity_file)); 937 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 938 if (fd == -1) { 939 printf("Could not save your public key in %s\n", 940 identity_file); 941 key_free(public); 942 first = 0; 943 continue; 944 } 945 f = fdopen(fd, "w"); 946 if (f == NULL) { 947 printf("fdopen %s failed\n", identity_file); 948 key_free(public); 949 first = 0; 950 continue; 951 } 952 if (!key_write(public, f)) { 953 fprintf(stderr, "write key failed\n"); 954 key_free(public); 955 first = 0; 956 continue; 957 } 958 fprintf(f, " %s\n", comment); 959 fclose(f); 960 key_free(public); 961 962 } 963 if (first != 0) 964 printf("\n"); 965} 966 967static void 968printhost(FILE *f, const char *name, Key *public, int ca, int hash) 969{ 970 if (print_fingerprint) { 971 enum fp_rep rep; 972 enum fp_type fptype; 973 char *fp, *ra; 974 975 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 976 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 977 fp = key_fingerprint(public, fptype, rep); 978 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 979 printf("%u %s %s (%s)\n", key_size(public), fp, name, 980 key_type(public)); 981 if (log_level >= SYSLOG_LEVEL_VERBOSE) 982 printf("%s\n", ra); 983 xfree(ra); 984 xfree(fp); 985 } else { 986 if (hash && (name = host_hash(name, NULL, 0)) == NULL) 987 fatal("hash_host failed"); 988 fprintf(f, "%s%s%s ", ca ? CA_MARKER : "", ca ? " " : "", name); 989 if (!key_write(public, f)) 990 fatal("key_write failed"); 991 fprintf(f, "\n"); 992 } 993} 994 995static void 996do_known_hosts(struct passwd *pw, const char *name) 997{ 998 FILE *in, *out = stdout; 999 Key *pub; 1000 char *cp, *cp2, *kp, *kp2; 1001 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; 1002 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; 1003 int ca; 1004 1005 if (!have_identity) { 1006 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1007 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1008 sizeof(identity_file)) 1009 fatal("Specified known hosts path too long"); 1010 xfree(cp); 1011 have_identity = 1; 1012 } 1013 if ((in = fopen(identity_file, "r")) == NULL) 1014 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1015 1016 /* 1017 * Find hosts goes to stdout, hash and deletions happen in-place 1018 * A corner case is ssh-keygen -HF foo, which should go to stdout 1019 */ 1020 if (!find_host && (hash_hosts || delete_host)) { 1021 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1022 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1023 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1024 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1025 fatal("known_hosts path too long"); 1026 umask(077); 1027 if ((c = mkstemp(tmp)) == -1) 1028 fatal("mkstemp: %s", strerror(errno)); 1029 if ((out = fdopen(c, "w")) == NULL) { 1030 c = errno; 1031 unlink(tmp); 1032 fatal("fdopen: %s", strerror(c)); 1033 } 1034 inplace = 1; 1035 } 1036 1037 while (fgets(line, sizeof(line), in)) { 1038 if ((cp = strchr(line, '\n')) == NULL) { 1039 error("line %d too long: %.40s...", num + 1, line); 1040 skip = 1; 1041 invalid = 1; 1042 continue; 1043 } 1044 num++; 1045 if (skip) { 1046 skip = 0; 1047 continue; 1048 } 1049 *cp = '\0'; 1050 1051 /* Skip leading whitespace, empty and comment lines. */ 1052 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 1053 ; 1054 if (!*cp || *cp == '\n' || *cp == '#') { 1055 if (inplace) 1056 fprintf(out, "%s\n", cp); 1057 continue; 1058 } 1059 /* Check whether this is a CA key */ 1060 if (strncasecmp(cp, CA_MARKER, sizeof(CA_MARKER) - 1) == 0 && 1061 (cp[sizeof(CA_MARKER) - 1] == ' ' || 1062 cp[sizeof(CA_MARKER) - 1] == '\t')) { 1063 ca = 1; 1064 cp += sizeof(CA_MARKER); 1065 } else 1066 ca = 0; 1067 1068 /* Find the end of the host name portion. */ 1069 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) 1070 ; 1071 1072 if (*kp == '\0' || *(kp + 1) == '\0') { 1073 error("line %d missing key: %.40s...", 1074 num, line); 1075 invalid = 1; 1076 continue; 1077 } 1078 *kp++ = '\0'; 1079 kp2 = kp; 1080 1081 pub = key_new(KEY_RSA1); 1082 if (key_read(pub, &kp) != 1) { 1083 kp = kp2; 1084 key_free(pub); 1085 pub = key_new(KEY_UNSPEC); 1086 if (key_read(pub, &kp) != 1) { 1087 error("line %d invalid key: %.40s...", 1088 num, line); 1089 key_free(pub); 1090 invalid = 1; 1091 continue; 1092 } 1093 } 1094 1095 if (*cp == HASH_DELIM) { 1096 if (find_host || delete_host) { 1097 cp2 = host_hash(name, cp, strlen(cp)); 1098 if (cp2 == NULL) { 1099 error("line %d: invalid hashed " 1100 "name: %.64s...", num, line); 1101 invalid = 1; 1102 continue; 1103 } 1104 c = (strcmp(cp2, cp) == 0); 1105 if (find_host && c) { 1106 printf("# Host %s found: " 1107 "line %d type %s%s\n", name, 1108 num, key_type(pub), 1109 ca ? " (CA key)" : ""); 1110 printhost(out, cp, pub, ca, 0); 1111 } 1112 if (delete_host) { 1113 if (!c && !ca) 1114 printhost(out, cp, pub, ca, 0); 1115 else 1116 printf("# Host %s found: " 1117 "line %d type %s\n", name, 1118 num, key_type(pub)); 1119 } 1120 } else if (hash_hosts) 1121 printhost(out, cp, pub, ca, 0); 1122 } else { 1123 if (find_host || delete_host) { 1124 c = (match_hostname(name, cp, 1125 strlen(cp)) == 1); 1126 if (find_host && c) { 1127 printf("# Host %s found: " 1128 "line %d type %s%s\n", name, 1129 num, key_type(pub), 1130 ca ? " (CA key)" : ""); 1131 printhost(out, name, pub, 1132 ca, hash_hosts && !ca); 1133 } 1134 if (delete_host) { 1135 if (!c && !ca) 1136 printhost(out, cp, pub, ca, 0); 1137 else 1138 printf("# Host %s found: " 1139 "line %d type %s\n", name, 1140 num, key_type(pub)); 1141 } 1142 } else if (hash_hosts) { 1143 for (cp2 = strsep(&cp, ","); 1144 cp2 != NULL && *cp2 != '\0'; 1145 cp2 = strsep(&cp, ",")) { 1146 if (ca) { 1147 fprintf(stderr, "Warning: " 1148 "ignoring CA key for host: " 1149 "%.64s\n", cp2); 1150 printhost(out, cp2, pub, ca, 0); 1151 } else if (strcspn(cp2, "*?!") != 1152 strlen(cp2)) { 1153 fprintf(stderr, "Warning: " 1154 "ignoring host name with " 1155 "metacharacters: %.64s\n", 1156 cp2); 1157 printhost(out, cp2, pub, ca, 0); 1158 } else 1159 printhost(out, cp2, pub, ca, 1); 1160 } 1161 has_unhashed = 1; 1162 } 1163 } 1164 key_free(pub); 1165 } 1166 fclose(in); 1167 1168 if (invalid) { 1169 fprintf(stderr, "%s is not a valid known_hosts file.\n", 1170 identity_file); 1171 if (inplace) { 1172 fprintf(stderr, "Not replacing existing known_hosts " 1173 "file because of errors\n"); 1174 fclose(out); 1175 unlink(tmp); 1176 } 1177 exit(1); 1178 } 1179 1180 if (inplace) { 1181 fclose(out); 1182 1183 /* Backup existing file */ 1184 if (unlink(old) == -1 && errno != ENOENT) 1185 fatal("unlink %.100s: %s", old, strerror(errno)); 1186 if (link(identity_file, old) == -1) 1187 fatal("link %.100s to %.100s: %s", identity_file, old, 1188 strerror(errno)); 1189 /* Move new one into place */ 1190 if (rename(tmp, identity_file) == -1) { 1191 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1192 strerror(errno)); 1193 unlink(tmp); 1194 unlink(old); 1195 exit(1); 1196 } 1197 1198 fprintf(stderr, "%s updated.\n", identity_file); 1199 fprintf(stderr, "Original contents retained as %s\n", old); 1200 if (has_unhashed) { 1201 fprintf(stderr, "WARNING: %s contains unhashed " 1202 "entries\n", old); 1203 fprintf(stderr, "Delete this file to ensure privacy " 1204 "of hostnames\n"); 1205 } 1206 } 1207 1208 exit(0); 1209} 1210 1211/* 1212 * Perform changing a passphrase. The argument is the passwd structure 1213 * for the current user. 1214 */ 1215static void 1216do_change_passphrase(struct passwd *pw) 1217{ 1218 char *comment; 1219 char *old_passphrase, *passphrase1, *passphrase2; 1220 struct stat st; 1221 Key *private; 1222 1223 if (!have_identity) 1224 ask_filename(pw, "Enter file in which the key is"); 1225 if (stat(identity_file, &st) < 0) { 1226 perror(identity_file); 1227 exit(1); 1228 } 1229 /* Try to load the file with empty passphrase. */ 1230 private = key_load_private(identity_file, "", &comment); 1231 if (private == NULL) { 1232 if (identity_passphrase) 1233 old_passphrase = xstrdup(identity_passphrase); 1234 else 1235 old_passphrase = 1236 read_passphrase("Enter old passphrase: ", 1237 RP_ALLOW_STDIN); 1238 private = key_load_private(identity_file, old_passphrase, 1239 &comment); 1240 memset(old_passphrase, 0, strlen(old_passphrase)); 1241 xfree(old_passphrase); 1242 if (private == NULL) { 1243 printf("Bad passphrase.\n"); 1244 exit(1); 1245 } 1246 } 1247 printf("Key has comment '%s'\n", comment); 1248 1249 /* Ask the new passphrase (twice). */ 1250 if (identity_new_passphrase) { 1251 passphrase1 = xstrdup(identity_new_passphrase); 1252 passphrase2 = NULL; 1253 } else { 1254 passphrase1 = 1255 read_passphrase("Enter new passphrase (empty for no " 1256 "passphrase): ", RP_ALLOW_STDIN); 1257 passphrase2 = read_passphrase("Enter same passphrase again: ", 1258 RP_ALLOW_STDIN); 1259 1260 /* Verify that they are the same. */ 1261 if (strcmp(passphrase1, passphrase2) != 0) { 1262 memset(passphrase1, 0, strlen(passphrase1)); 1263 memset(passphrase2, 0, strlen(passphrase2)); 1264 xfree(passphrase1); 1265 xfree(passphrase2); 1266 printf("Pass phrases do not match. Try again.\n"); 1267 exit(1); 1268 } 1269 /* Destroy the other copy. */ 1270 memset(passphrase2, 0, strlen(passphrase2)); 1271 xfree(passphrase2); 1272 } 1273 1274 /* Save the file using the new passphrase. */ 1275 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1276 printf("Saving the key failed: %s.\n", identity_file); 1277 memset(passphrase1, 0, strlen(passphrase1)); 1278 xfree(passphrase1); 1279 key_free(private); 1280 xfree(comment); 1281 exit(1); 1282 } 1283 /* Destroy the passphrase and the copy of the key in memory. */ 1284 memset(passphrase1, 0, strlen(passphrase1)); 1285 xfree(passphrase1); 1286 key_free(private); /* Destroys contents */ 1287 xfree(comment); 1288 1289 printf("Your identification has been saved with the new passphrase.\n"); 1290 exit(0); 1291} 1292 1293/* 1294 * Print the SSHFP RR. 1295 */ 1296static int 1297do_print_resource_record(struct passwd *pw, char *fname, char *hname) 1298{ 1299 Key *public; 1300 char *comment = NULL; 1301 struct stat st; 1302 1303 if (fname == NULL) 1304 ask_filename(pw, "Enter file in which the key is"); 1305 if (stat(fname, &st) < 0) { 1306 if (errno == ENOENT) 1307 return 0; 1308 perror(fname); 1309 exit(1); 1310 } 1311 public = key_load_public(fname, &comment); 1312 if (public != NULL) { 1313 export_dns_rr(hname, public, stdout, print_generic); 1314 key_free(public); 1315 xfree(comment); 1316 return 1; 1317 } 1318 if (comment) 1319 xfree(comment); 1320 1321 printf("failed to read v2 public key from %s.\n", fname); 1322 exit(1); 1323} 1324 1325/* 1326 * Change the comment of a private key file. 1327 */ 1328static void 1329do_change_comment(struct passwd *pw) 1330{ 1331 char new_comment[1024], *comment, *passphrase; 1332 Key *private; 1333 Key *public; 1334 struct stat st; 1335 FILE *f; 1336 int fd; 1337 1338 if (!have_identity) 1339 ask_filename(pw, "Enter file in which the key is"); 1340 if (stat(identity_file, &st) < 0) { 1341 perror(identity_file); 1342 exit(1); 1343 } 1344 private = key_load_private(identity_file, "", &comment); 1345 if (private == NULL) { 1346 if (identity_passphrase) 1347 passphrase = xstrdup(identity_passphrase); 1348 else if (identity_new_passphrase) 1349 passphrase = xstrdup(identity_new_passphrase); 1350 else 1351 passphrase = read_passphrase("Enter passphrase: ", 1352 RP_ALLOW_STDIN); 1353 /* Try to load using the passphrase. */ 1354 private = key_load_private(identity_file, passphrase, &comment); 1355 if (private == NULL) { 1356 memset(passphrase, 0, strlen(passphrase)); 1357 xfree(passphrase); 1358 printf("Bad passphrase.\n"); 1359 exit(1); 1360 } 1361 } else { 1362 passphrase = xstrdup(""); 1363 } 1364 if (private->type != KEY_RSA1) { 1365 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 1366 key_free(private); 1367 exit(1); 1368 } 1369 printf("Key now has comment '%s'\n", comment); 1370 1371 if (identity_comment) { 1372 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1373 } else { 1374 printf("Enter new comment: "); 1375 fflush(stdout); 1376 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1377 memset(passphrase, 0, strlen(passphrase)); 1378 key_free(private); 1379 exit(1); 1380 } 1381 new_comment[strcspn(new_comment, "\n")] = '\0'; 1382 } 1383 1384 /* Save the file using the new passphrase. */ 1385 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 1386 printf("Saving the key failed: %s.\n", identity_file); 1387 memset(passphrase, 0, strlen(passphrase)); 1388 xfree(passphrase); 1389 key_free(private); 1390 xfree(comment); 1391 exit(1); 1392 } 1393 memset(passphrase, 0, strlen(passphrase)); 1394 xfree(passphrase); 1395 public = key_from_private(private); 1396 key_free(private); 1397 1398 strlcat(identity_file, ".pub", sizeof(identity_file)); 1399 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1400 if (fd == -1) { 1401 printf("Could not save your public key in %s\n", identity_file); 1402 exit(1); 1403 } 1404 f = fdopen(fd, "w"); 1405 if (f == NULL) { 1406 printf("fdopen %s failed\n", identity_file); 1407 exit(1); 1408 } 1409 if (!key_write(public, f)) 1410 fprintf(stderr, "write key failed\n"); 1411 key_free(public); 1412 fprintf(f, " %s\n", new_comment); 1413 fclose(f); 1414 1415 xfree(comment); 1416 1417 printf("The comment in your key file has been changed.\n"); 1418 exit(0); 1419} 1420 1421static const char * 1422fmt_validity(u_int64_t valid_from, u_int64_t valid_to) 1423{ 1424 char from[32], to[32]; 1425 static char ret[64]; 1426 time_t tt; 1427 struct tm *tm; 1428 1429 *from = *to = '\0'; 1430 if (valid_from == 0 && valid_to == 0xffffffffffffffffULL) 1431 return "forever"; 1432 1433 if (valid_from != 0) { 1434 /* XXX revisit INT_MAX in 2038 :) */ 1435 tt = valid_from > INT_MAX ? INT_MAX : valid_from; 1436 tm = localtime(&tt); 1437 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); 1438 } 1439 if (valid_to != 0xffffffffffffffffULL) { 1440 /* XXX revisit INT_MAX in 2038 :) */ 1441 tt = valid_to > INT_MAX ? INT_MAX : valid_to; 1442 tm = localtime(&tt); 1443 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); 1444 } 1445 1446 if (valid_from == 0) { 1447 snprintf(ret, sizeof(ret), "before %s", to); 1448 return ret; 1449 } 1450 if (valid_to == 0xffffffffffffffffULL) { 1451 snprintf(ret, sizeof(ret), "after %s", from); 1452 return ret; 1453 } 1454 1455 snprintf(ret, sizeof(ret), "from %s to %s", from, to); 1456 return ret; 1457} 1458 1459static void 1460add_flag_option(Buffer *c, const char *name) 1461{ 1462 debug3("%s: %s", __func__, name); 1463 buffer_put_cstring(c, name); 1464 buffer_put_string(c, NULL, 0); 1465} 1466 1467static void 1468add_string_option(Buffer *c, const char *name, const char *value) 1469{ 1470 Buffer b; 1471 1472 debug3("%s: %s=%s", __func__, name, value); 1473 buffer_init(&b); 1474 buffer_put_cstring(&b, value); 1475 1476 buffer_put_cstring(c, name); 1477 buffer_put_string(c, buffer_ptr(&b), buffer_len(&b)); 1478 1479 buffer_free(&b); 1480} 1481 1482#define OPTIONS_CRITICAL 1 1483#define OPTIONS_EXTENSIONS 2 1484static void 1485prepare_options_buf(Buffer *c, int which) 1486{ 1487 buffer_clear(c); 1488 if ((which & OPTIONS_CRITICAL) != 0 && 1489 certflags_command != NULL) 1490 add_string_option(c, "force-command", certflags_command); 1491 if ((which & OPTIONS_EXTENSIONS) != 0 && 1492 (certflags_flags & CERTOPT_X_FWD) != 0) 1493 add_flag_option(c, "permit-X11-forwarding"); 1494 if ((which & OPTIONS_EXTENSIONS) != 0 && 1495 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1496 add_flag_option(c, "permit-agent-forwarding"); 1497 if ((which & OPTIONS_EXTENSIONS) != 0 && 1498 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1499 add_flag_option(c, "permit-port-forwarding"); 1500 if ((which & OPTIONS_EXTENSIONS) != 0 && 1501 (certflags_flags & CERTOPT_PTY) != 0) 1502 add_flag_option(c, "permit-pty"); 1503 if ((which & OPTIONS_EXTENSIONS) != 0 && 1504 (certflags_flags & CERTOPT_USER_RC) != 0) 1505 add_flag_option(c, "permit-user-rc"); 1506 if ((which & OPTIONS_CRITICAL) != 0 && 1507 certflags_src_addr != NULL) 1508 add_string_option(c, "source-address", certflags_src_addr); 1509} 1510 1511static Key * 1512load_pkcs11_key(char *path) 1513{ 1514#ifdef ENABLE_PKCS11 1515 Key **keys = NULL, *public, *private = NULL; 1516 int i, nkeys; 1517 1518 if ((public = key_load_public(path, NULL)) == NULL) 1519 fatal("Couldn't load CA public key \"%s\"", path); 1520 1521 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1522 debug3("%s: %d keys", __func__, nkeys); 1523 if (nkeys <= 0) 1524 fatal("cannot read public key from pkcs11"); 1525 for (i = 0; i < nkeys; i++) { 1526 if (key_equal_public(public, keys[i])) { 1527 private = keys[i]; 1528 continue; 1529 } 1530 key_free(keys[i]); 1531 } 1532 xfree(keys); 1533 key_free(public); 1534 return private; 1535#else 1536 fatal("no pkcs11 support"); 1537#endif /* ENABLE_PKCS11 */ 1538} 1539 1540static void 1541do_ca_sign(struct passwd *pw, int argc, char **argv) 1542{ 1543 int i, fd; 1544 u_int n; 1545 Key *ca, *public; 1546 char *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1547 FILE *f; 1548 int v00 = 0; /* legacy keys */ 1549 1550 if (key_type_name != NULL) { 1551 switch (key_type_from_name(key_type_name)) { 1552 case KEY_RSA_CERT_V00: 1553 case KEY_DSA_CERT_V00: 1554 v00 = 1; 1555 break; 1556 case KEY_UNSPEC: 1557 if (strcasecmp(key_type_name, "v00") == 0) { 1558 v00 = 1; 1559 break; 1560 } else if (strcasecmp(key_type_name, "v01") == 0) 1561 break; 1562 /* FALLTHROUGH */ 1563 default: 1564 fprintf(stderr, "unknown key type %s\n", key_type_name); 1565 exit(1); 1566 } 1567 } 1568 1569 pkcs11_init(1); 1570 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1571 if (pkcs11provider != NULL) { 1572 if ((ca = load_pkcs11_key(tmp)) == NULL) 1573 fatal("No PKCS#11 key matching %s found", ca_key_path); 1574 } else if ((ca = load_identity(tmp)) == NULL) 1575 fatal("Couldn't load CA key \"%s\"", tmp); 1576 xfree(tmp); 1577 1578 for (i = 0; i < argc; i++) { 1579 /* Split list of principals */ 1580 n = 0; 1581 if (cert_principals != NULL) { 1582 otmp = tmp = xstrdup(cert_principals); 1583 plist = NULL; 1584 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1585 plist = xrealloc(plist, n + 1, sizeof(*plist)); 1586 if (*(plist[n] = xstrdup(cp)) == '\0') 1587 fatal("Empty principal name"); 1588 } 1589 xfree(otmp); 1590 } 1591 1592 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1593 if ((public = key_load_public(tmp, &comment)) == NULL) 1594 fatal("%s: unable to open \"%s\"", __func__, tmp); 1595 if (public->type != KEY_RSA && public->type != KEY_DSA && 1596 public->type != KEY_ECDSA) 1597 fatal("%s: key \"%s\" type %s cannot be certified", 1598 __func__, tmp, key_type(public)); 1599 1600 /* Prepare certificate to sign */ 1601 if (key_to_certified(public, v00) != 0) 1602 fatal("Could not upgrade key %s to certificate", tmp); 1603 public->cert->type = cert_key_type; 1604 public->cert->serial = (u_int64_t)cert_serial; 1605 public->cert->key_id = xstrdup(cert_key_id); 1606 public->cert->nprincipals = n; 1607 public->cert->principals = plist; 1608 public->cert->valid_after = cert_valid_from; 1609 public->cert->valid_before = cert_valid_to; 1610 if (v00) { 1611 prepare_options_buf(&public->cert->critical, 1612 OPTIONS_CRITICAL|OPTIONS_EXTENSIONS); 1613 } else { 1614 prepare_options_buf(&public->cert->critical, 1615 OPTIONS_CRITICAL); 1616 prepare_options_buf(&public->cert->extensions, 1617 OPTIONS_EXTENSIONS); 1618 } 1619 public->cert->signature_key = key_from_private(ca); 1620 1621 if (key_certify(public, ca) != 0) 1622 fatal("Couldn't not certify key %s", tmp); 1623 1624 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1625 *cp = '\0'; 1626 xasprintf(&out, "%s-cert.pub", tmp); 1627 xfree(tmp); 1628 1629 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1630 fatal("Could not open \"%s\" for writing: %s", out, 1631 strerror(errno)); 1632 if ((f = fdopen(fd, "w")) == NULL) 1633 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1634 if (!key_write(public, f)) 1635 fatal("Could not write certified key to %s", out); 1636 fprintf(f, " %s\n", comment); 1637 fclose(f); 1638 1639 if (!quiet) { 1640 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1641 "valid %s", key_cert_type(public), 1642 out, public->cert->key_id, 1643 (unsigned long long)public->cert->serial, 1644 cert_principals != NULL ? " for " : "", 1645 cert_principals != NULL ? cert_principals : "", 1646 fmt_validity(cert_valid_from, cert_valid_to)); 1647 } 1648 1649 key_free(public); 1650 xfree(out); 1651 } 1652 pkcs11_terminate(); 1653 exit(0); 1654} 1655 1656static u_int64_t 1657parse_relative_time(const char *s, time_t now) 1658{ 1659 int64_t mul, secs; 1660 1661 mul = *s == '-' ? -1 : 1; 1662 1663 if ((secs = convtime(s + 1)) == -1) 1664 fatal("Invalid relative certificate time %s", s); 1665 if (mul == -1 && secs > now) 1666 fatal("Certificate time %s cannot be represented", s); 1667 return now + (u_int64_t)(secs * mul); 1668} 1669 1670static u_int64_t 1671parse_absolute_time(const char *s) 1672{ 1673 struct tm tm; 1674 time_t tt; 1675 char buf[32], *fmt; 1676 1677 /* 1678 * POSIX strptime says "The application shall ensure that there 1679 * is white-space or other non-alphanumeric characters between 1680 * any two conversion specifications" so arrange things this way. 1681 */ 1682 switch (strlen(s)) { 1683 case 8: 1684 fmt = "%Y-%m-%d"; 1685 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1686 break; 1687 case 14: 1688 fmt = "%Y-%m-%dT%H:%M:%S"; 1689 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1690 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1691 break; 1692 default: 1693 fatal("Invalid certificate time format %s", s); 1694 } 1695 1696 bzero(&tm, sizeof(tm)); 1697 if (strptime(buf, fmt, &tm) == NULL) 1698 fatal("Invalid certificate time %s", s); 1699 if ((tt = mktime(&tm)) < 0) 1700 fatal("Certificate time %s cannot be represented", s); 1701 return (u_int64_t)tt; 1702} 1703 1704static void 1705parse_cert_times(char *timespec) 1706{ 1707 char *from, *to; 1708 time_t now = time(NULL); 1709 int64_t secs; 1710 1711 /* +timespec relative to now */ 1712 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1713 if ((secs = convtime(timespec + 1)) == -1) 1714 fatal("Invalid relative certificate life %s", timespec); 1715 cert_valid_to = now + secs; 1716 /* 1717 * Backdate certificate one minute to avoid problems on hosts 1718 * with poorly-synchronised clocks. 1719 */ 1720 cert_valid_from = ((now - 59)/ 60) * 60; 1721 return; 1722 } 1723 1724 /* 1725 * from:to, where 1726 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1727 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1728 */ 1729 from = xstrdup(timespec); 1730 to = strchr(from, ':'); 1731 if (to == NULL || from == to || *(to + 1) == '\0') 1732 fatal("Invalid certificate life specification %s", timespec); 1733 *to++ = '\0'; 1734 1735 if (*from == '-' || *from == '+') 1736 cert_valid_from = parse_relative_time(from, now); 1737 else 1738 cert_valid_from = parse_absolute_time(from); 1739 1740 if (*to == '-' || *to == '+') 1741 cert_valid_to = parse_relative_time(to, cert_valid_from); 1742 else 1743 cert_valid_to = parse_absolute_time(to); 1744 1745 if (cert_valid_to <= cert_valid_from) 1746 fatal("Empty certificate validity interval"); 1747 xfree(from); 1748} 1749 1750static void 1751add_cert_option(char *opt) 1752{ 1753 char *val; 1754 1755 if (strcasecmp(opt, "clear") == 0) 1756 certflags_flags = 0; 1757 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1758 certflags_flags &= ~CERTOPT_X_FWD; 1759 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1760 certflags_flags |= CERTOPT_X_FWD; 1761 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1762 certflags_flags &= ~CERTOPT_AGENT_FWD; 1763 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1764 certflags_flags |= CERTOPT_AGENT_FWD; 1765 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1766 certflags_flags &= ~CERTOPT_PORT_FWD; 1767 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1768 certflags_flags |= CERTOPT_PORT_FWD; 1769 else if (strcasecmp(opt, "no-pty") == 0) 1770 certflags_flags &= ~CERTOPT_PTY; 1771 else if (strcasecmp(opt, "permit-pty") == 0) 1772 certflags_flags |= CERTOPT_PTY; 1773 else if (strcasecmp(opt, "no-user-rc") == 0) 1774 certflags_flags &= ~CERTOPT_USER_RC; 1775 else if (strcasecmp(opt, "permit-user-rc") == 0) 1776 certflags_flags |= CERTOPT_USER_RC; 1777 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1778 val = opt + 14; 1779 if (*val == '\0') 1780 fatal("Empty force-command option"); 1781 if (certflags_command != NULL) 1782 fatal("force-command already specified"); 1783 certflags_command = xstrdup(val); 1784 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1785 val = opt + 15; 1786 if (*val == '\0') 1787 fatal("Empty source-address option"); 1788 if (certflags_src_addr != NULL) 1789 fatal("source-address already specified"); 1790 if (addr_match_cidr_list(NULL, val) != 0) 1791 fatal("Invalid source-address list"); 1792 certflags_src_addr = xstrdup(val); 1793 } else 1794 fatal("Unsupported certificate option \"%s\"", opt); 1795} 1796 1797static void 1798show_options(const Buffer *optbuf, int v00, int in_critical) 1799{ 1800 u_char *name, *data; 1801 u_int dlen; 1802 Buffer options, option; 1803 1804 buffer_init(&options); 1805 buffer_append(&options, buffer_ptr(optbuf), buffer_len(optbuf)); 1806 1807 buffer_init(&option); 1808 while (buffer_len(&options) != 0) { 1809 name = buffer_get_string(&options, NULL); 1810 data = buffer_get_string_ptr(&options, &dlen); 1811 buffer_append(&option, data, dlen); 1812 printf(" %s", name); 1813 if ((v00 || !in_critical) && 1814 (strcmp(name, "permit-X11-forwarding") == 0 || 1815 strcmp(name, "permit-agent-forwarding") == 0 || 1816 strcmp(name, "permit-port-forwarding") == 0 || 1817 strcmp(name, "permit-pty") == 0 || 1818 strcmp(name, "permit-user-rc") == 0)) 1819 printf("\n"); 1820 else if ((v00 || in_critical) && 1821 (strcmp(name, "force-command") == 0 || 1822 strcmp(name, "source-address") == 0)) { 1823 data = buffer_get_string(&option, NULL); 1824 printf(" %s\n", data); 1825 xfree(data); 1826 } else { 1827 printf(" UNKNOWN OPTION (len %u)\n", 1828 buffer_len(&option)); 1829 buffer_clear(&option); 1830 } 1831 xfree(name); 1832 if (buffer_len(&option) != 0) 1833 fatal("Option corrupt: extra data at end"); 1834 } 1835 buffer_free(&option); 1836 buffer_free(&options); 1837} 1838 1839static void 1840do_show_cert(struct passwd *pw) 1841{ 1842 Key *key; 1843 struct stat st; 1844 char *key_fp, *ca_fp; 1845 u_int i, v00; 1846 1847 if (!have_identity) 1848 ask_filename(pw, "Enter file in which the key is"); 1849 if (stat(identity_file, &st) < 0) 1850 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1851 if ((key = key_load_public(identity_file, NULL)) == NULL) 1852 fatal("%s is not a public key", identity_file); 1853 if (!key_is_cert(key)) 1854 fatal("%s is not a certificate", identity_file); 1855 v00 = key->type == KEY_RSA_CERT_V00 || key->type == KEY_DSA_CERT_V00; 1856 1857 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); 1858 ca_fp = key_fingerprint(key->cert->signature_key, 1859 SSH_FP_MD5, SSH_FP_HEX); 1860 1861 printf("%s:\n", identity_file); 1862 printf(" Type: %s %s certificate\n", key_ssh_name(key), 1863 key_cert_type(key)); 1864 printf(" Public key: %s %s\n", key_type(key), key_fp); 1865 printf(" Signing CA: %s %s\n", 1866 key_type(key->cert->signature_key), ca_fp); 1867 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1868 if (!v00) { 1869 printf(" Serial: %llu\n", 1870 (unsigned long long)key->cert->serial); 1871 } 1872 printf(" Valid: %s\n", 1873 fmt_validity(key->cert->valid_after, key->cert->valid_before)); 1874 printf(" Principals: "); 1875 if (key->cert->nprincipals == 0) 1876 printf("(none)\n"); 1877 else { 1878 for (i = 0; i < key->cert->nprincipals; i++) 1879 printf("\n %s", 1880 key->cert->principals[i]); 1881 printf("\n"); 1882 } 1883 printf(" Critical Options: "); 1884 if (buffer_len(&key->cert->critical) == 0) 1885 printf("(none)\n"); 1886 else { 1887 printf("\n"); 1888 show_options(&key->cert->critical, v00, 1); 1889 } 1890 if (!v00) { 1891 printf(" Extensions: "); 1892 if (buffer_len(&key->cert->extensions) == 0) 1893 printf("(none)\n"); 1894 else { 1895 printf("\n"); 1896 show_options(&key->cert->extensions, v00, 0); 1897 } 1898 } 1899 exit(0); 1900} 1901 1902static void 1903load_krl(const char *path, struct ssh_krl **krlp) 1904{ 1905 Buffer krlbuf; 1906 int fd; 1907 1908 buffer_init(&krlbuf); 1909 if ((fd = open(path, O_RDONLY)) == -1) 1910 fatal("open %s: %s", path, strerror(errno)); 1911 if (!key_load_file(fd, path, &krlbuf)) 1912 fatal("Unable to load KRL"); 1913 close(fd); 1914 /* XXX check sigs */ 1915 if (ssh_krl_from_blob(&krlbuf, krlp, NULL, 0) != 0 || 1916 *krlp == NULL) 1917 fatal("Invalid KRL file"); 1918 buffer_free(&krlbuf); 1919} 1920 1921static void 1922update_krl_from_file(struct passwd *pw, const char *file, const Key *ca, 1923 struct ssh_krl *krl) 1924{ 1925 Key *key = NULL; 1926 u_long lnum = 0; 1927 char *path, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES]; 1928 unsigned long long serial, serial2; 1929 int i, was_explicit_key, was_sha1, r; 1930 FILE *krl_spec; 1931 1932 path = tilde_expand_filename(file, pw->pw_uid); 1933 if (strcmp(path, "-") == 0) { 1934 krl_spec = stdin; 1935 free(path); 1936 path = xstrdup("(standard input)"); 1937 } else if ((krl_spec = fopen(path, "r")) == NULL) 1938 fatal("fopen %s: %s", path, strerror(errno)); 1939 1940 if (!quiet) 1941 printf("Revoking from %s\n", path); 1942 while (read_keyfile_line(krl_spec, path, line, sizeof(line), 1943 &lnum) == 0) { 1944 was_explicit_key = was_sha1 = 0; 1945 cp = line + strspn(line, " \t"); 1946 /* Trim trailing space, comments and strip \n */ 1947 for (i = 0, r = -1; cp[i] != '\0'; i++) { 1948 if (cp[i] == '#' || cp[i] == '\n') { 1949 cp[i] = '\0'; 1950 break; 1951 } 1952 if (cp[i] == ' ' || cp[i] == '\t') { 1953 /* Remember the start of a span of whitespace */ 1954 if (r == -1) 1955 r = i; 1956 } else 1957 r = -1; 1958 } 1959 if (r != -1) 1960 cp[r] = '\0'; 1961 if (*cp == '\0') 1962 continue; 1963 if (strncasecmp(cp, "serial:", 7) == 0) { 1964 if (ca == NULL) { 1965 fatal("revoking certificated by serial number " 1966 "requires specification of a CA key"); 1967 } 1968 cp += 7; 1969 cp = cp + strspn(cp, " \t"); 1970 errno = 0; 1971 serial = strtoull(cp, &ep, 0); 1972 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 1973 fatal("%s:%lu: invalid serial \"%s\"", 1974 path, lnum, cp); 1975 if (errno == ERANGE && serial == ULLONG_MAX) 1976 fatal("%s:%lu: serial out of range", 1977 path, lnum); 1978 serial2 = serial; 1979 if (*ep == '-') { 1980 cp = ep + 1; 1981 errno = 0; 1982 serial2 = strtoull(cp, &ep, 0); 1983 if (*cp == '\0' || *ep != '\0') 1984 fatal("%s:%lu: invalid serial \"%s\"", 1985 path, lnum, cp); 1986 if (errno == ERANGE && serial2 == ULLONG_MAX) 1987 fatal("%s:%lu: serial out of range", 1988 path, lnum); 1989 if (serial2 <= serial) 1990 fatal("%s:%lu: invalid serial range " 1991 "%llu:%llu", path, lnum, 1992 (unsigned long long)serial, 1993 (unsigned long long)serial2); 1994 } 1995 if (ssh_krl_revoke_cert_by_serial_range(krl, 1996 ca, serial, serial2) != 0) { 1997 fatal("%s: revoke serial failed", 1998 __func__); 1999 } 2000 } else if (strncasecmp(cp, "id:", 3) == 0) { 2001 if (ca == NULL) { 2002 fatal("revoking certificated by key ID " 2003 "requires specification of a CA key"); 2004 } 2005 cp += 3; 2006 cp = cp + strspn(cp, " \t"); 2007 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2008 fatal("%s: revoke key ID failed", __func__); 2009 } else { 2010 if (strncasecmp(cp, "key:", 4) == 0) { 2011 cp += 4; 2012 cp = cp + strspn(cp, " \t"); 2013 was_explicit_key = 1; 2014 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2015 cp += 5; 2016 cp = cp + strspn(cp, " \t"); 2017 was_sha1 = 1; 2018 } else { 2019 /* 2020 * Just try to process the line as a key. 2021 * Parsing will fail if it isn't. 2022 */ 2023 } 2024 if ((key = key_new(KEY_UNSPEC)) == NULL) 2025 fatal("key_new"); 2026 if (key_read(key, &cp) != 1) 2027 fatal("%s:%lu: invalid key", path, lnum); 2028 if (was_explicit_key) 2029 r = ssh_krl_revoke_key_explicit(krl, key); 2030 else if (was_sha1) 2031 r = ssh_krl_revoke_key_sha1(krl, key); 2032 else 2033 r = ssh_krl_revoke_key(krl, key); 2034 if (r != 0) 2035 fatal("%s: revoke key failed", __func__); 2036 key_free(key); 2037 } 2038 } 2039 if (strcmp(path, "-") != 0) 2040 fclose(krl_spec); 2041} 2042 2043static void 2044do_gen_krl(struct passwd *pw, int updating, int argc, char **argv) 2045{ 2046 struct ssh_krl *krl; 2047 struct stat sb; 2048 Key *ca = NULL; 2049 int fd, i; 2050 char *tmp; 2051 Buffer kbuf; 2052 2053 if (*identity_file == '\0') 2054 fatal("KRL generation requires an output file"); 2055 if (stat(identity_file, &sb) == -1) { 2056 if (errno != ENOENT) 2057 fatal("Cannot access KRL \"%s\": %s", 2058 identity_file, strerror(errno)); 2059 if (updating) 2060 fatal("KRL \"%s\" does not exist", identity_file); 2061 } 2062 if (ca_key_path != NULL) { 2063 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2064 if ((ca = key_load_public(tmp, NULL)) == NULL) 2065 fatal("Cannot load CA public key %s", tmp); 2066 xfree(tmp); 2067 } 2068 2069 if (updating) 2070 load_krl(identity_file, &krl); 2071 else if ((krl = ssh_krl_init()) == NULL) 2072 fatal("couldn't create KRL"); 2073 2074 if (cert_serial != 0) 2075 ssh_krl_set_version(krl, cert_serial); 2076 if (identity_comment != NULL) 2077 ssh_krl_set_comment(krl, identity_comment); 2078 2079 for (i = 0; i < argc; i++) 2080 update_krl_from_file(pw, argv[i], ca, krl); 2081 2082 buffer_init(&kbuf); 2083 if (ssh_krl_to_blob(krl, &kbuf, NULL, 0) != 0) 2084 fatal("Couldn't generate KRL"); 2085 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2086 fatal("open %s: %s", identity_file, strerror(errno)); 2087 if (atomicio(vwrite, fd, buffer_ptr(&kbuf), buffer_len(&kbuf)) != 2088 buffer_len(&kbuf)) 2089 fatal("write %s: %s", identity_file, strerror(errno)); 2090 close(fd); 2091 buffer_free(&kbuf); 2092 ssh_krl_free(krl); 2093} 2094 2095static void 2096do_check_krl(struct passwd *pw, int argc, char **argv) 2097{ 2098 int i, r, ret = 0; 2099 char *comment; 2100 struct ssh_krl *krl; 2101 Key *k; 2102 2103 if (*identity_file == '\0') 2104 fatal("KRL checking requires an input file"); 2105 load_krl(identity_file, &krl); 2106 for (i = 0; i < argc; i++) { 2107 if ((k = key_load_public(argv[i], &comment)) == NULL) 2108 fatal("Cannot load public key %s", argv[i]); 2109 r = ssh_krl_check_key(krl, k); 2110 printf("%s%s%s%s: %s\n", argv[i], 2111 *comment ? " (" : "", comment, *comment ? ")" : "", 2112 r == 0 ? "ok" : "REVOKED"); 2113 if (r != 0) 2114 ret = 1; 2115 key_free(k); 2116 free(comment); 2117 } 2118 ssh_krl_free(krl); 2119 exit(ret); 2120} 2121 2122static void 2123usage(void) 2124{ 2125 fprintf(stderr, "usage: %s [options]\n", __progname); 2126 fprintf(stderr, "Options:\n"); 2127 fprintf(stderr, " -A Generate non-existent host keys for all key types.\n"); 2128 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); 2129 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 2130 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 2131 fprintf(stderr, " -C comment Provide new comment.\n"); 2132 fprintf(stderr, " -c Change comment in private and public key files.\n"); 2133#ifdef ENABLE_PKCS11 2134 fprintf(stderr, " -D pkcs11 Download public key from pkcs11 token.\n"); 2135#endif 2136 fprintf(stderr, " -e Export OpenSSH to foreign format key file.\n"); 2137 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); 2138 fprintf(stderr, " -f filename Filename of the key file.\n"); 2139 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); 2140 fprintf(stderr, " -g Use generic DNS resource record format.\n"); 2141 fprintf(stderr, " -H Hash names in known_hosts file.\n"); 2142 fprintf(stderr, " -h Generate host certificate instead of a user certificate.\n"); 2143 fprintf(stderr, " -I key_id Key identifier to include in certificate.\n"); 2144 fprintf(stderr, " -i Import foreign format to OpenSSH key file.\n"); 2145 fprintf(stderr, " -J number Screen this number of moduli lines.\n"); 2146 fprintf(stderr, " -j number Start screening moduli at specified line.\n"); 2147 fprintf(stderr, " -K checkpt Write checkpoints to this file.\n"); 2148 fprintf(stderr, " -k Generate a KRL file.\n"); 2149 fprintf(stderr, " -L Print the contents of a certificate.\n"); 2150 fprintf(stderr, " -l Show fingerprint of key file.\n"); 2151 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); 2152 fprintf(stderr, " -m key_fmt Conversion format for -e/-i (PEM|PKCS8|RFC4716).\n"); 2153 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 2154 fprintf(stderr, " -n name,... User/host principal names to include in certificate\n"); 2155 fprintf(stderr, " -O option Specify a certificate option.\n"); 2156 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 2157 fprintf(stderr, " -p Change passphrase of private key file.\n"); 2158 fprintf(stderr, " -Q Test whether key(s) are revoked in KRL.\n"); 2159 fprintf(stderr, " -q Quiet.\n"); 2160 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); 2161 fprintf(stderr, " -r hostname Print DNS resource record.\n"); 2162 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); 2163 fprintf(stderr, " -s ca_key Certify keys with CA key.\n"); 2164 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); 2165 fprintf(stderr, " -t type Specify type of key to create.\n"); 2166 fprintf(stderr, " -u Update KRL rather than creating a new one.\n"); 2167 fprintf(stderr, " -V from:to Specify certificate validity interval.\n"); 2168 fprintf(stderr, " -v Verbose.\n"); 2169 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); 2170 fprintf(stderr, " -y Read private key file and print public key.\n"); 2171 fprintf(stderr, " -z serial Specify a serial number.\n"); 2172 2173 exit(1); 2174} 2175 2176/* 2177 * Main program for key management. 2178 */ 2179int 2180main(int argc, char **argv) 2181{ 2182 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 2183 char *checkpoint = NULL; 2184 char out_file[MAXPATHLEN], *ep, *rr_hostname = NULL; 2185 Key *private, *public; 2186 struct passwd *pw; 2187 struct stat st; 2188 int opt, type, fd; 2189 u_int32_t memory = 0, generator_wanted = 0, trials = 100; 2190 int do_gen_candidates = 0, do_screen_candidates = 0; 2191 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 2192 unsigned long start_lineno = 0, lines_to_process = 0; 2193 BIGNUM *start = NULL; 2194 FILE *f; 2195 const char *errstr; 2196 2197 extern int optind; 2198 extern char *optarg; 2199 2200 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 2201 sanitise_stdfd(); 2202 2203 __progname = ssh_get_progname(argv[0]); 2204 2205 OpenSSL_add_all_algorithms(); 2206 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 2207 2208 seed_rng(); 2209 2210 /* we need this for the home * directory. */ 2211 pw = getpwuid(getuid()); 2212 if (!pw) { 2213 printf("You don't exist, go away!\n"); 2214 exit(1); 2215 } 2216 if (gethostname(hostname, sizeof(hostname)) < 0) { 2217 perror("gethostname"); 2218 exit(1); 2219 } 2220 2221 while ((opt = getopt(argc, argv, "ABHLQXceghiklpquvxy" 2222 "C:D:F:G:I:J:K:M:N:O:P:R:S:T:V:W:a:b:f:g:j:m:n:r:s:t:z:")) != -1) { 2223 switch (opt) { 2224 case 'A': 2225 gen_all_hostkeys = 1; 2226 break; 2227 case 'b': 2228 bits = (u_int32_t)strtonum(optarg, 256, 32768, &errstr); 2229 if (errstr) 2230 fatal("Bits has bad value %s (%s)", 2231 optarg, errstr); 2232 break; 2233 case 'F': 2234 find_host = 1; 2235 rr_hostname = optarg; 2236 break; 2237 case 'H': 2238 hash_hosts = 1; 2239 break; 2240 case 'I': 2241 cert_key_id = optarg; 2242 break; 2243 case 'J': 2244 lines_to_process = strtoul(optarg, NULL, 10); 2245 break; 2246 case 'j': 2247 start_lineno = strtoul(optarg, NULL, 10); 2248 break; 2249 case 'R': 2250 delete_host = 1; 2251 rr_hostname = optarg; 2252 break; 2253 case 'L': 2254 show_cert = 1; 2255 break; 2256 case 'l': 2257 print_fingerprint = 1; 2258 break; 2259 case 'B': 2260 print_bubblebabble = 1; 2261 break; 2262 case 'm': 2263 if (strcasecmp(optarg, "RFC4716") == 0 || 2264 strcasecmp(optarg, "ssh2") == 0) { 2265 convert_format = FMT_RFC4716; 2266 break; 2267 } 2268 if (strcasecmp(optarg, "PKCS8") == 0) { 2269 convert_format = FMT_PKCS8; 2270 break; 2271 } 2272 if (strcasecmp(optarg, "PEM") == 0) { 2273 convert_format = FMT_PEM; 2274 break; 2275 } 2276 fatal("Unsupported conversion format \"%s\"", optarg); 2277 case 'n': 2278 cert_principals = optarg; 2279 break; 2280 case 'p': 2281 change_passphrase = 1; 2282 break; 2283 case 'c': 2284 change_comment = 1; 2285 break; 2286 case 'f': 2287 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= 2288 sizeof(identity_file)) 2289 fatal("Identity filename too long"); 2290 have_identity = 1; 2291 break; 2292 case 'g': 2293 print_generic = 1; 2294 break; 2295 case 'P': 2296 identity_passphrase = optarg; 2297 break; 2298 case 'N': 2299 identity_new_passphrase = optarg; 2300 break; 2301 case 'Q': 2302 check_krl = 1; 2303 break; 2304 case 'O': 2305 add_cert_option(optarg); 2306 break; 2307 case 'C': 2308 identity_comment = optarg; 2309 break; 2310 case 'q': 2311 quiet = 1; 2312 break; 2313 case 'e': 2314 case 'x': 2315 /* export key */ 2316 convert_to = 1; 2317 break; 2318 case 'h': 2319 cert_key_type = SSH2_CERT_TYPE_HOST; 2320 certflags_flags = 0; 2321 break; 2322 case 'k': 2323 gen_krl = 1; 2324 break; 2325 case 'i': 2326 case 'X': 2327 /* import key */ 2328 convert_from = 1; 2329 break; 2330 case 'y': 2331 print_public = 1; 2332 break; 2333 case 's': 2334 ca_key_path = optarg; 2335 break; 2336 case 't': 2337 key_type_name = optarg; 2338 break; 2339 case 'D': 2340 pkcs11provider = optarg; 2341 break; 2342 case 'u': 2343 update_krl = 1; 2344 break; 2345 case 'v': 2346 if (log_level == SYSLOG_LEVEL_INFO) 2347 log_level = SYSLOG_LEVEL_DEBUG1; 2348 else { 2349 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2350 log_level < SYSLOG_LEVEL_DEBUG3) 2351 log_level++; 2352 } 2353 break; 2354 case 'r': 2355 rr_hostname = optarg; 2356 break; 2357 case 'W': 2358 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2359 UINT_MAX, &errstr); 2360 if (errstr) 2361 fatal("Desired generator has bad value: %s (%s)", 2362 optarg, errstr); 2363 break; 2364 case 'a': 2365 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2366 if (errstr) 2367 fatal("Invalid number of trials: %s (%s)", 2368 optarg, errstr); 2369 break; 2370 case 'M': 2371 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 2372 if (errstr) 2373 fatal("Memory limit is %s: %s", errstr, optarg); 2374 break; 2375 case 'G': 2376 do_gen_candidates = 1; 2377 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2378 sizeof(out_file)) 2379 fatal("Output filename too long"); 2380 break; 2381 case 'T': 2382 do_screen_candidates = 1; 2383 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2384 sizeof(out_file)) 2385 fatal("Output filename too long"); 2386 break; 2387 case 'K': 2388 if (strlen(optarg) >= MAXPATHLEN) 2389 fatal("Checkpoint filename too long"); 2390 checkpoint = xstrdup(optarg); 2391 break; 2392 case 'S': 2393 /* XXX - also compare length against bits */ 2394 if (BN_hex2bn(&start, optarg) == 0) 2395 fatal("Invalid start point."); 2396 break; 2397 case 'V': 2398 parse_cert_times(optarg); 2399 break; 2400 case 'z': 2401 errno = 0; 2402 cert_serial = strtoull(optarg, &ep, 10); 2403 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 2404 (errno == ERANGE && cert_serial == ULLONG_MAX)) 2405 fatal("Invalid serial number \"%s\"", optarg); 2406 break; 2407 case '?': 2408 default: 2409 usage(); 2410 } 2411 } 2412 2413 /* reinit */ 2414 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2415 2416 argv += optind; 2417 argc -= optind; 2418 2419 if (ca_key_path != NULL) { 2420 if (argc < 1 && !gen_krl) { 2421 printf("Too few arguments.\n"); 2422 usage(); 2423 } 2424 } else if (argc > 0 && !gen_krl && !check_krl) { 2425 printf("Too many arguments.\n"); 2426 usage(); 2427 } 2428 if (change_passphrase && change_comment) { 2429 printf("Can only have one of -p and -c.\n"); 2430 usage(); 2431 } 2432 if (print_fingerprint && (delete_host || hash_hosts)) { 2433 printf("Cannot use -l with -H or -R.\n"); 2434 usage(); 2435 } 2436 if (gen_krl) { 2437 do_gen_krl(pw, update_krl, argc, argv); 2438 return (0); 2439 } 2440 if (check_krl) { 2441 do_check_krl(pw, argc, argv); 2442 return (0); 2443 } 2444 if (ca_key_path != NULL) { 2445 if (cert_key_id == NULL) 2446 fatal("Must specify key id (-I) when certifying"); 2447 do_ca_sign(pw, argc, argv); 2448 } 2449 if (show_cert) 2450 do_show_cert(pw); 2451 if (delete_host || hash_hosts || find_host) 2452 do_known_hosts(pw, rr_hostname); 2453 if (pkcs11provider != NULL) 2454 do_download(pw); 2455 if (print_fingerprint || print_bubblebabble) 2456 do_fingerprint(pw); 2457 if (change_passphrase) 2458 do_change_passphrase(pw); 2459 if (change_comment) 2460 do_change_comment(pw); 2461 if (convert_to) 2462 do_convert_to(pw); 2463 if (convert_from) 2464 do_convert_from(pw); 2465 if (print_public) 2466 do_print_public(pw); 2467 if (rr_hostname != NULL) { 2468 unsigned int n = 0; 2469 2470 if (have_identity) { 2471 n = do_print_resource_record(pw, 2472 identity_file, rr_hostname); 2473 if (n == 0) { 2474 perror(identity_file); 2475 exit(1); 2476 } 2477 exit(0); 2478 } else { 2479 2480 n += do_print_resource_record(pw, 2481 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2482 n += do_print_resource_record(pw, 2483 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2484 n += do_print_resource_record(pw, 2485 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname); 2486 2487 if (n == 0) 2488 fatal("no keys found."); 2489 exit(0); 2490 } 2491 } 2492 2493 if (do_gen_candidates) { 2494 FILE *out = fopen(out_file, "w"); 2495 2496 if (out == NULL) { 2497 error("Couldn't open modulus candidate file \"%s\": %s", 2498 out_file, strerror(errno)); 2499 return (1); 2500 } 2501 if (bits == 0) 2502 bits = DEFAULT_BITS; 2503 if (gen_candidates(out, memory, bits, start) != 0) 2504 fatal("modulus candidate generation failed"); 2505 2506 return (0); 2507 } 2508 2509 if (do_screen_candidates) { 2510 FILE *in; 2511 FILE *out = fopen(out_file, "a"); 2512 2513 if (have_identity && strcmp(identity_file, "-") != 0) { 2514 if ((in = fopen(identity_file, "r")) == NULL) { 2515 fatal("Couldn't open modulus candidate " 2516 "file \"%s\": %s", identity_file, 2517 strerror(errno)); 2518 } 2519 } else 2520 in = stdin; 2521 2522 if (out == NULL) { 2523 fatal("Couldn't open moduli file \"%s\": %s", 2524 out_file, strerror(errno)); 2525 } 2526 if (prime_test(in, out, trials, generator_wanted, checkpoint, 2527 start_lineno, lines_to_process) != 0) 2528 fatal("modulus screening failed"); 2529 return (0); 2530 } 2531 2532 if (gen_all_hostkeys) { 2533 do_gen_all_hostkeys(pw); 2534 return (0); 2535 } 2536 2537 arc4random_stir(); 2538 2539 if (key_type_name == NULL) 2540 key_type_name = "rsa"; 2541 2542 type = key_type_from_name(key_type_name); 2543 type_bits_valid(type, &bits); 2544 2545 if (!quiet) 2546 printf("Generating public/private %s key pair.\n", key_type_name); 2547 private = key_generate(type, bits); 2548 if (private == NULL) { 2549 fprintf(stderr, "key_generate failed\n"); 2550 exit(1); 2551 } 2552 public = key_from_private(private); 2553 2554 if (!have_identity) 2555 ask_filename(pw, "Enter file in which to save the key"); 2556 2557 /* Create ~/.ssh directory if it doesn't already exist. */ 2558 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2559 pw->pw_dir, _PATH_SSH_USER_DIR); 2560 if (strstr(identity_file, dotsshdir) != NULL) { 2561 if (stat(dotsshdir, &st) < 0) { 2562 if (errno != ENOENT) { 2563 error("Could not stat %s: %s", dotsshdir, 2564 strerror(errno)); 2565 } else if (mkdir(dotsshdir, 0700) < 0) { 2566 error("Could not create directory '%s': %s", 2567 dotsshdir, strerror(errno)); 2568 } else if (!quiet) 2569 printf("Created directory '%s'.\n", dotsshdir); 2570 } 2571 } 2572 /* If the file already exists, ask the user to confirm. */ 2573 if (stat(identity_file, &st) >= 0) { 2574 char yesno[3]; 2575 printf("%s already exists.\n", identity_file); 2576 printf("Overwrite (y/n)? "); 2577 fflush(stdout); 2578 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2579 exit(1); 2580 if (yesno[0] != 'y' && yesno[0] != 'Y') 2581 exit(1); 2582 } 2583 /* Ask for a passphrase (twice). */ 2584 if (identity_passphrase) 2585 passphrase1 = xstrdup(identity_passphrase); 2586 else if (identity_new_passphrase) 2587 passphrase1 = xstrdup(identity_new_passphrase); 2588 else { 2589passphrase_again: 2590 passphrase1 = 2591 read_passphrase("Enter passphrase (empty for no " 2592 "passphrase): ", RP_ALLOW_STDIN); 2593 passphrase2 = read_passphrase("Enter same passphrase again: ", 2594 RP_ALLOW_STDIN); 2595 if (strcmp(passphrase1, passphrase2) != 0) { 2596 /* 2597 * The passphrases do not match. Clear them and 2598 * retry. 2599 */ 2600 memset(passphrase1, 0, strlen(passphrase1)); 2601 memset(passphrase2, 0, strlen(passphrase2)); 2602 xfree(passphrase1); 2603 xfree(passphrase2); 2604 printf("Passphrases do not match. Try again.\n"); 2605 goto passphrase_again; 2606 } 2607 /* Clear the other copy of the passphrase. */ 2608 memset(passphrase2, 0, strlen(passphrase2)); 2609 xfree(passphrase2); 2610 } 2611 2612 if (identity_comment) { 2613 strlcpy(comment, identity_comment, sizeof(comment)); 2614 } else { 2615 /* Create default comment field for the passphrase. */ 2616 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2617 } 2618 2619 /* Save the key with the given passphrase and comment. */ 2620 if (!key_save_private(private, identity_file, passphrase1, comment)) { 2621 printf("Saving the key failed: %s.\n", identity_file); 2622 memset(passphrase1, 0, strlen(passphrase1)); 2623 xfree(passphrase1); 2624 exit(1); 2625 } 2626 /* Clear the passphrase. */ 2627 memset(passphrase1, 0, strlen(passphrase1)); 2628 xfree(passphrase1); 2629 2630 /* Clear the private key and the random number generator. */ 2631 key_free(private); 2632 arc4random_stir(); 2633 2634 if (!quiet) 2635 printf("Your identification has been saved in %s.\n", identity_file); 2636 2637 strlcat(identity_file, ".pub", sizeof(identity_file)); 2638 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 2639 if (fd == -1) { 2640 printf("Could not save your public key in %s\n", identity_file); 2641 exit(1); 2642 } 2643 f = fdopen(fd, "w"); 2644 if (f == NULL) { 2645 printf("fdopen %s failed\n", identity_file); 2646 exit(1); 2647 } 2648 if (!key_write(public, f)) 2649 fprintf(stderr, "write key failed\n"); 2650 fprintf(f, " %s\n", comment); 2651 fclose(f); 2652 2653 if (!quiet) { 2654 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 2655 char *ra = key_fingerprint(public, SSH_FP_MD5, 2656 SSH_FP_RANDOMART); 2657 printf("Your public key has been saved in %s.\n", 2658 identity_file); 2659 printf("The key fingerprint is:\n"); 2660 printf("%s %s\n", fp, comment); 2661 printf("The key's randomart image is:\n"); 2662 printf("%s\n", ra); 2663 xfree(ra); 2664 xfree(fp); 2665 } 2666 2667 key_free(public); 2668 exit(0); 2669} 2670