ssh-keygen.c revision 215116
1/* $OpenBSD: ssh-keygen.c,v 1.197 2010/08/04 06:07:11 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 "ssh2.h" 52 53#ifdef ENABLE_PKCS11 54#include "ssh-pkcs11.h" 55#endif 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 60u_int32_t bits = 0; 61 62/* 63 * Flag indicating that we just want to change the passphrase. This can be 64 * set on the command line. 65 */ 66int change_passphrase = 0; 67 68/* 69 * Flag indicating that we just want to change the comment. This can be set 70 * on the command line. 71 */ 72int change_comment = 0; 73 74int quiet = 0; 75 76int log_level = SYSLOG_LEVEL_INFO; 77 78/* Flag indicating that we want to hash a known_hosts file */ 79int hash_hosts = 0; 80/* Flag indicating that we want lookup a host in known_hosts file */ 81int find_host = 0; 82/* Flag indicating that we want to delete a host from a known_hosts file */ 83int delete_host = 0; 84 85/* Flag indicating that we want to show the contents of a certificate */ 86int show_cert = 0; 87 88/* Flag indicating that we just want to see the key fingerprint */ 89int print_fingerprint = 0; 90int print_bubblebabble = 0; 91 92/* The identity file name, given on the command line or entered by the user. */ 93char identity_file[1024]; 94int have_identity = 0; 95 96/* This is set to the passphrase if given on the command line. */ 97char *identity_passphrase = NULL; 98 99/* This is set to the new passphrase if given on the command line. */ 100char *identity_new_passphrase = NULL; 101 102/* This is set to the new comment if given on the command line. */ 103char *identity_comment = NULL; 104 105/* Path to CA key when certifying keys. */ 106char *ca_key_path = NULL; 107 108/* Certificate serial number */ 109long long cert_serial = 0; 110 111/* Key type when certifying */ 112u_int cert_key_type = SSH2_CERT_TYPE_USER; 113 114/* "key ID" of signed key */ 115char *cert_key_id = NULL; 116 117/* Comma-separated list of principal names for certifying keys */ 118char *cert_principals = NULL; 119 120/* Validity period for certificates */ 121u_int64_t cert_valid_from = 0; 122u_int64_t cert_valid_to = ~0ULL; 123 124/* Certificate options */ 125#define CERTOPT_X_FWD (1) 126#define CERTOPT_AGENT_FWD (1<<1) 127#define CERTOPT_PORT_FWD (1<<2) 128#define CERTOPT_PTY (1<<3) 129#define CERTOPT_USER_RC (1<<4) 130#define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 131 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 132u_int32_t certflags_flags = CERTOPT_DEFAULT; 133char *certflags_command = NULL; 134char *certflags_src_addr = NULL; 135 136/* Conversion to/from various formats */ 137int convert_to = 0; 138int convert_from = 0; 139enum { 140 FMT_RFC4716, 141 FMT_PKCS8, 142 FMT_PEM 143} convert_format = FMT_RFC4716; 144int print_public = 0; 145int print_generic = 0; 146 147char *key_type_name = NULL; 148 149/* Load key from this PKCS#11 provider */ 150char *pkcs11provider = NULL; 151 152/* argv0 */ 153extern char *__progname; 154 155char hostname[MAXHOSTNAMELEN]; 156 157/* moduli.c */ 158int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 159int prime_test(FILE *, FILE *, u_int32_t, u_int32_t); 160 161static void 162ask_filename(struct passwd *pw, const char *prompt) 163{ 164 char buf[1024]; 165 char *name = NULL; 166 167 if (key_type_name == NULL) 168 name = _PATH_SSH_CLIENT_ID_RSA; 169 else { 170 switch (key_type_from_name(key_type_name)) { 171 case KEY_RSA1: 172 name = _PATH_SSH_CLIENT_IDENTITY; 173 break; 174 case KEY_DSA_CERT: 175 case KEY_DSA_CERT_V00: 176 case KEY_DSA: 177 name = _PATH_SSH_CLIENT_ID_DSA; 178 break; 179 case KEY_RSA_CERT: 180 case KEY_RSA_CERT_V00: 181 case KEY_RSA: 182 name = _PATH_SSH_CLIENT_ID_RSA; 183 break; 184 default: 185 fprintf(stderr, "bad key type\n"); 186 exit(1); 187 break; 188 } 189 } 190 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 191 fprintf(stderr, "%s (%s): ", prompt, identity_file); 192 if (fgets(buf, sizeof(buf), stdin) == NULL) 193 exit(1); 194 buf[strcspn(buf, "\n")] = '\0'; 195 if (strcmp(buf, "") != 0) 196 strlcpy(identity_file, buf, sizeof(identity_file)); 197 have_identity = 1; 198} 199 200static Key * 201load_identity(char *filename) 202{ 203 char *pass; 204 Key *prv; 205 206 prv = key_load_private(filename, "", NULL); 207 if (prv == NULL) { 208 if (identity_passphrase) 209 pass = xstrdup(identity_passphrase); 210 else 211 pass = read_passphrase("Enter passphrase: ", 212 RP_ALLOW_STDIN); 213 prv = key_load_private(filename, pass, NULL); 214 memset(pass, 0, strlen(pass)); 215 xfree(pass); 216 } 217 return prv; 218} 219 220#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 221#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 222#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 223#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 224 225static void 226do_convert_to_ssh2(struct passwd *pw, Key *k) 227{ 228 u_int len; 229 u_char *blob; 230 char comment[61]; 231 232 if (key_to_blob(k, &blob, &len) <= 0) { 233 fprintf(stderr, "key_to_blob failed\n"); 234 exit(1); 235 } 236 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 237 snprintf(comment, sizeof(comment), 238 "%u-bit %s, converted by %s@%s from OpenSSH", 239 key_size(k), key_type(k), 240 pw->pw_name, hostname); 241 242 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 243 fprintf(stdout, "Comment: \"%s\"\n", comment); 244 dump_base64(stdout, blob, len); 245 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 246 key_free(k); 247 xfree(blob); 248 exit(0); 249} 250 251static void 252do_convert_to_pkcs8(Key *k) 253{ 254 switch (key_type_plain(k->type)) { 255 case KEY_RSA: 256 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 257 fatal("PEM_write_RSA_PUBKEY failed"); 258 break; 259 case KEY_DSA: 260 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 261 fatal("PEM_write_DSA_PUBKEY failed"); 262 break; 263 default: 264 fatal("%s: unsupported key type %s", __func__, key_type(k)); 265 } 266 exit(0); 267} 268 269static void 270do_convert_to_pem(Key *k) 271{ 272 switch (key_type_plain(k->type)) { 273 case KEY_RSA: 274 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 275 fatal("PEM_write_RSAPublicKey failed"); 276 break; 277#if notyet /* OpenSSH 0.9.8 lacks this function */ 278 case KEY_DSA: 279 if (!PEM_write_DSAPublicKey(stdout, k->dsa)) 280 fatal("PEM_write_DSAPublicKey failed"); 281 break; 282#endif 283 default: 284 fatal("%s: unsupported key type %s", __func__, key_type(k)); 285 } 286 exit(0); 287} 288 289static void 290do_convert_to(struct passwd *pw) 291{ 292 Key *k; 293 struct stat st; 294 295 if (!have_identity) 296 ask_filename(pw, "Enter file in which the key is"); 297 if (stat(identity_file, &st) < 0) 298 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 299 if ((k = key_load_public(identity_file, NULL)) == NULL) { 300 if ((k = load_identity(identity_file)) == NULL) { 301 fprintf(stderr, "load failed\n"); 302 exit(1); 303 } 304 } 305 if (k->type == KEY_RSA1) { 306 fprintf(stderr, "version 1 keys are not supported\n"); 307 exit(1); 308 } 309 310 switch (convert_format) { 311 case FMT_RFC4716: 312 do_convert_to_ssh2(pw, k); 313 break; 314 case FMT_PKCS8: 315 do_convert_to_pkcs8(k); 316 break; 317 case FMT_PEM: 318 do_convert_to_pem(k); 319 break; 320 default: 321 fatal("%s: unknown key format %d", __func__, convert_format); 322 } 323 exit(0); 324} 325 326static void 327buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 328{ 329 u_int bignum_bits = buffer_get_int(b); 330 u_int bytes = (bignum_bits + 7) / 8; 331 332 if (buffer_len(b) < bytes) 333 fatal("buffer_get_bignum_bits: input buffer too small: " 334 "need %d have %d", bytes, buffer_len(b)); 335 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL) 336 fatal("buffer_get_bignum_bits: BN_bin2bn failed"); 337 buffer_consume(b, bytes); 338} 339 340static Key * 341do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 342{ 343 Buffer b; 344 Key *key = NULL; 345 char *type, *cipher; 346 u_char *sig, data[] = "abcde12345"; 347 int magic, rlen, ktype, i1, i2, i3, i4; 348 u_int slen; 349 u_long e; 350 351 buffer_init(&b); 352 buffer_append(&b, blob, blen); 353 354 magic = buffer_get_int(&b); 355 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 356 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 357 buffer_free(&b); 358 return NULL; 359 } 360 i1 = buffer_get_int(&b); 361 type = buffer_get_string(&b, NULL); 362 cipher = buffer_get_string(&b, NULL); 363 i2 = buffer_get_int(&b); 364 i3 = buffer_get_int(&b); 365 i4 = buffer_get_int(&b); 366 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 367 if (strcmp(cipher, "none") != 0) { 368 error("unsupported cipher %s", cipher); 369 xfree(cipher); 370 buffer_free(&b); 371 xfree(type); 372 return NULL; 373 } 374 xfree(cipher); 375 376 if (strstr(type, "dsa")) { 377 ktype = KEY_DSA; 378 } else if (strstr(type, "rsa")) { 379 ktype = KEY_RSA; 380 } else { 381 buffer_free(&b); 382 xfree(type); 383 return NULL; 384 } 385 key = key_new_private(ktype); 386 xfree(type); 387 388 switch (key->type) { 389 case KEY_DSA: 390 buffer_get_bignum_bits(&b, key->dsa->p); 391 buffer_get_bignum_bits(&b, key->dsa->g); 392 buffer_get_bignum_bits(&b, key->dsa->q); 393 buffer_get_bignum_bits(&b, key->dsa->pub_key); 394 buffer_get_bignum_bits(&b, key->dsa->priv_key); 395 break; 396 case KEY_RSA: 397 e = buffer_get_char(&b); 398 debug("e %lx", e); 399 if (e < 30) { 400 e <<= 8; 401 e += buffer_get_char(&b); 402 debug("e %lx", e); 403 e <<= 8; 404 e += buffer_get_char(&b); 405 debug("e %lx", e); 406 } 407 if (!BN_set_word(key->rsa->e, e)) { 408 buffer_free(&b); 409 key_free(key); 410 return NULL; 411 } 412 buffer_get_bignum_bits(&b, key->rsa->d); 413 buffer_get_bignum_bits(&b, key->rsa->n); 414 buffer_get_bignum_bits(&b, key->rsa->iqmp); 415 buffer_get_bignum_bits(&b, key->rsa->q); 416 buffer_get_bignum_bits(&b, key->rsa->p); 417 rsa_generate_additional_parameters(key->rsa); 418 break; 419 } 420 rlen = buffer_len(&b); 421 if (rlen != 0) 422 error("do_convert_private_ssh2_from_blob: " 423 "remaining bytes in key blob %d", rlen); 424 buffer_free(&b); 425 426 /* try the key */ 427 key_sign(key, &sig, &slen, data, sizeof(data)); 428 key_verify(key, sig, slen, data, sizeof(data)); 429 xfree(sig); 430 return key; 431} 432 433static int 434get_line(FILE *fp, char *line, size_t len) 435{ 436 int c; 437 size_t pos = 0; 438 439 line[0] = '\0'; 440 while ((c = fgetc(fp)) != EOF) { 441 if (pos >= len - 1) { 442 fprintf(stderr, "input line too long.\n"); 443 exit(1); 444 } 445 switch (c) { 446 case '\r': 447 c = fgetc(fp); 448 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { 449 fprintf(stderr, "unget: %s\n", strerror(errno)); 450 exit(1); 451 } 452 return pos; 453 case '\n': 454 return pos; 455 } 456 line[pos++] = c; 457 line[pos] = '\0'; 458 } 459 /* We reached EOF */ 460 return -1; 461} 462 463static void 464do_convert_from_ssh2(struct passwd *pw, Key **k, int *private) 465{ 466 int blen; 467 u_int len; 468 char line[1024]; 469 u_char blob[8096]; 470 char encoded[8096]; 471 int escaped = 0; 472 FILE *fp; 473 474 if ((fp = fopen(identity_file, "r")) == NULL) 475 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 476 encoded[0] = '\0'; 477 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 478 if (line[blen - 1] == '\\') 479 escaped++; 480 if (strncmp(line, "----", 4) == 0 || 481 strstr(line, ": ") != NULL) { 482 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 483 *private = 1; 484 if (strstr(line, " END ") != NULL) { 485 break; 486 } 487 /* fprintf(stderr, "ignore: %s", line); */ 488 continue; 489 } 490 if (escaped) { 491 escaped--; 492 /* fprintf(stderr, "escaped: %s", line); */ 493 continue; 494 } 495 strlcat(encoded, line, sizeof(encoded)); 496 } 497 len = strlen(encoded); 498 if (((len % 4) == 3) && 499 (encoded[len-1] == '=') && 500 (encoded[len-2] == '=') && 501 (encoded[len-3] == '=')) 502 encoded[len-3] = '\0'; 503 blen = uudecode(encoded, blob, sizeof(blob)); 504 if (blen < 0) { 505 fprintf(stderr, "uudecode failed.\n"); 506 exit(1); 507 } 508 *k = *private ? 509 do_convert_private_ssh2_from_blob(blob, blen) : 510 key_from_blob(blob, blen); 511 if (*k == NULL) { 512 fprintf(stderr, "decode blob failed.\n"); 513 exit(1); 514 } 515 fclose(fp); 516} 517 518static void 519do_convert_from_pkcs8(Key **k, int *private) 520{ 521 EVP_PKEY *pubkey; 522 FILE *fp; 523 524 if ((fp = fopen(identity_file, "r")) == NULL) 525 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 526 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 527 fatal("%s: %s is not a recognised public key format", __func__, 528 identity_file); 529 } 530 fclose(fp); 531 switch (EVP_PKEY_type(pubkey->type)) { 532 case EVP_PKEY_RSA: 533 *k = key_new(KEY_UNSPEC); 534 (*k)->type = KEY_RSA; 535 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 536 break; 537 case EVP_PKEY_DSA: 538 *k = key_new(KEY_UNSPEC); 539 (*k)->type = KEY_DSA; 540 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 541 break; 542 default: 543 fatal("%s: unsupported pubkey type %d", __func__, 544 EVP_PKEY_type(pubkey->type)); 545 } 546 EVP_PKEY_free(pubkey); 547 return; 548} 549 550static void 551do_convert_from_pem(Key **k, int *private) 552{ 553 FILE *fp; 554 RSA *rsa; 555#ifdef notyet 556 DSA *dsa; 557#endif 558 559 if ((fp = fopen(identity_file, "r")) == NULL) 560 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 561 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 562 *k = key_new(KEY_UNSPEC); 563 (*k)->type = KEY_RSA; 564 (*k)->rsa = rsa; 565 fclose(fp); 566 return; 567 } 568#if notyet /* OpenSSH 0.9.8 lacks this function */ 569 rewind(fp); 570 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 571 *k = key_new(KEY_UNSPEC); 572 (*k)->type = KEY_DSA; 573 (*k)->dsa = dsa; 574 fclose(fp); 575 return; 576 } 577#endif 578 fatal("%s: unrecognised raw private key format", __func__); 579} 580 581static void 582do_convert_from(struct passwd *pw) 583{ 584 Key *k = NULL; 585 int private = 0, ok = 0; 586 struct stat st; 587 588 if (!have_identity) 589 ask_filename(pw, "Enter file in which the key is"); 590 if (stat(identity_file, &st) < 0) 591 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 592 593 switch (convert_format) { 594 case FMT_RFC4716: 595 do_convert_from_ssh2(pw, &k, &private); 596 break; 597 case FMT_PKCS8: 598 do_convert_from_pkcs8(&k, &private); 599 break; 600 case FMT_PEM: 601 do_convert_from_pem(&k, &private); 602 break; 603 default: 604 fatal("%s: unknown key format %d", __func__, convert_format); 605 } 606 607 if (!private) 608 ok = key_write(k, stdout); 609 if (ok) 610 fprintf(stdout, "\n"); 611 else { 612 switch (k->type) { 613 case KEY_DSA: 614 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 615 NULL, 0, NULL, NULL); 616 break; 617 case KEY_RSA: 618 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 619 NULL, 0, NULL, NULL); 620 break; 621 default: 622 fatal("%s: unsupported key type %s", __func__, 623 key_type(k)); 624 } 625 } 626 627 if (!ok) { 628 fprintf(stderr, "key write failed\n"); 629 exit(1); 630 } 631 key_free(k); 632 exit(0); 633} 634 635static void 636do_print_public(struct passwd *pw) 637{ 638 Key *prv; 639 struct stat st; 640 641 if (!have_identity) 642 ask_filename(pw, "Enter file in which the key is"); 643 if (stat(identity_file, &st) < 0) { 644 perror(identity_file); 645 exit(1); 646 } 647 prv = load_identity(identity_file); 648 if (prv == NULL) { 649 fprintf(stderr, "load failed\n"); 650 exit(1); 651 } 652 if (!key_write(prv, stdout)) 653 fprintf(stderr, "key_write failed"); 654 key_free(prv); 655 fprintf(stdout, "\n"); 656 exit(0); 657} 658 659static void 660do_download(struct passwd *pw) 661{ 662#ifdef ENABLE_PKCS11 663 Key **keys = NULL; 664 int i, nkeys; 665 666 pkcs11_init(0); 667 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 668 if (nkeys <= 0) 669 fatal("cannot read public key from pkcs11"); 670 for (i = 0; i < nkeys; i++) { 671 key_write(keys[i], stdout); 672 key_free(keys[i]); 673 fprintf(stdout, "\n"); 674 } 675 xfree(keys); 676 pkcs11_terminate(); 677 exit(0); 678#else 679 fatal("no pkcs11 support"); 680#endif /* ENABLE_PKCS11 */ 681} 682 683static void 684do_fingerprint(struct passwd *pw) 685{ 686 FILE *f; 687 Key *public; 688 char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra; 689 int i, skip = 0, num = 0, invalid = 1; 690 enum fp_rep rep; 691 enum fp_type fptype; 692 struct stat st; 693 694 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 695 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 696 697 if (!have_identity) 698 ask_filename(pw, "Enter file in which the key is"); 699 if (stat(identity_file, &st) < 0) { 700 perror(identity_file); 701 exit(1); 702 } 703 public = key_load_public(identity_file, &comment); 704 if (public != NULL) { 705 fp = key_fingerprint(public, fptype, rep); 706 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 707 printf("%u %s %s (%s)\n", key_size(public), fp, comment, 708 key_type(public)); 709 if (log_level >= SYSLOG_LEVEL_VERBOSE) 710 printf("%s\n", ra); 711 key_free(public); 712 xfree(comment); 713 xfree(ra); 714 xfree(fp); 715 exit(0); 716 } 717 if (comment) { 718 xfree(comment); 719 comment = NULL; 720 } 721 722 if ((f = fopen(identity_file, "r")) == NULL) 723 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 724 725 while (fgets(line, sizeof(line), f)) { 726 if ((cp = strchr(line, '\n')) == NULL) { 727 error("line %d too long: %.40s...", 728 num + 1, line); 729 skip = 1; 730 continue; 731 } 732 num++; 733 if (skip) { 734 skip = 0; 735 continue; 736 } 737 *cp = '\0'; 738 739 /* Skip leading whitespace, empty and comment lines. */ 740 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 741 ; 742 if (!*cp || *cp == '\n' || *cp == '#') 743 continue; 744 i = strtol(cp, &ep, 10); 745 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 746 int quoted = 0; 747 comment = cp; 748 for (; *cp && (quoted || (*cp != ' ' && 749 *cp != '\t')); cp++) { 750 if (*cp == '\\' && cp[1] == '"') 751 cp++; /* Skip both */ 752 else if (*cp == '"') 753 quoted = !quoted; 754 } 755 if (!*cp) 756 continue; 757 *cp++ = '\0'; 758 } 759 ep = cp; 760 public = key_new(KEY_RSA1); 761 if (key_read(public, &cp) != 1) { 762 cp = ep; 763 key_free(public); 764 public = key_new(KEY_UNSPEC); 765 if (key_read(public, &cp) != 1) { 766 key_free(public); 767 continue; 768 } 769 } 770 comment = *cp ? cp : comment; 771 fp = key_fingerprint(public, fptype, rep); 772 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 773 printf("%u %s %s (%s)\n", key_size(public), fp, 774 comment ? comment : "no comment", key_type(public)); 775 if (log_level >= SYSLOG_LEVEL_VERBOSE) 776 printf("%s\n", ra); 777 xfree(ra); 778 xfree(fp); 779 key_free(public); 780 invalid = 0; 781 } 782 fclose(f); 783 784 if (invalid) { 785 printf("%s is not a public key file.\n", identity_file); 786 exit(1); 787 } 788 exit(0); 789} 790 791static void 792printhost(FILE *f, const char *name, Key *public, int ca, int hash) 793{ 794 if (print_fingerprint) { 795 enum fp_rep rep; 796 enum fp_type fptype; 797 char *fp, *ra; 798 799 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 800 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 801 fp = key_fingerprint(public, fptype, rep); 802 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); 803 printf("%u %s %s (%s)\n", key_size(public), fp, name, 804 key_type(public)); 805 if (log_level >= SYSLOG_LEVEL_VERBOSE) 806 printf("%s\n", ra); 807 xfree(ra); 808 xfree(fp); 809 } else { 810 if (hash && (name = host_hash(name, NULL, 0)) == NULL) 811 fatal("hash_host failed"); 812 fprintf(f, "%s%s%s ", ca ? CA_MARKER : "", ca ? " " : "", name); 813 if (!key_write(public, f)) 814 fatal("key_write failed"); 815 fprintf(f, "\n"); 816 } 817} 818 819static void 820do_known_hosts(struct passwd *pw, const char *name) 821{ 822 FILE *in, *out = stdout; 823 Key *pub; 824 char *cp, *cp2, *kp, *kp2; 825 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; 826 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; 827 int ca; 828 829 if (!have_identity) { 830 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 831 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 832 sizeof(identity_file)) 833 fatal("Specified known hosts path too long"); 834 xfree(cp); 835 have_identity = 1; 836 } 837 if ((in = fopen(identity_file, "r")) == NULL) 838 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 839 840 /* 841 * Find hosts goes to stdout, hash and deletions happen in-place 842 * A corner case is ssh-keygen -HF foo, which should go to stdout 843 */ 844 if (!find_host && (hash_hosts || delete_host)) { 845 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 846 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 847 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 848 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 849 fatal("known_hosts path too long"); 850 umask(077); 851 if ((c = mkstemp(tmp)) == -1) 852 fatal("mkstemp: %s", strerror(errno)); 853 if ((out = fdopen(c, "w")) == NULL) { 854 c = errno; 855 unlink(tmp); 856 fatal("fdopen: %s", strerror(c)); 857 } 858 inplace = 1; 859 } 860 861 while (fgets(line, sizeof(line), in)) { 862 if ((cp = strchr(line, '\n')) == NULL) { 863 error("line %d too long: %.40s...", num + 1, line); 864 skip = 1; 865 invalid = 1; 866 continue; 867 } 868 num++; 869 if (skip) { 870 skip = 0; 871 continue; 872 } 873 *cp = '\0'; 874 875 /* Skip leading whitespace, empty and comment lines. */ 876 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 877 ; 878 if (!*cp || *cp == '\n' || *cp == '#') { 879 if (inplace) 880 fprintf(out, "%s\n", cp); 881 continue; 882 } 883 /* Check whether this is a CA key */ 884 if (strncasecmp(cp, CA_MARKER, sizeof(CA_MARKER) - 1) == 0 && 885 (cp[sizeof(CA_MARKER) - 1] == ' ' || 886 cp[sizeof(CA_MARKER) - 1] == '\t')) { 887 ca = 1; 888 cp += sizeof(CA_MARKER); 889 } else 890 ca = 0; 891 892 /* Find the end of the host name portion. */ 893 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) 894 ; 895 896 if (*kp == '\0' || *(kp + 1) == '\0') { 897 error("line %d missing key: %.40s...", 898 num, line); 899 invalid = 1; 900 continue; 901 } 902 *kp++ = '\0'; 903 kp2 = kp; 904 905 pub = key_new(KEY_RSA1); 906 if (key_read(pub, &kp) != 1) { 907 kp = kp2; 908 key_free(pub); 909 pub = key_new(KEY_UNSPEC); 910 if (key_read(pub, &kp) != 1) { 911 error("line %d invalid key: %.40s...", 912 num, line); 913 key_free(pub); 914 invalid = 1; 915 continue; 916 } 917 } 918 919 if (*cp == HASH_DELIM) { 920 if (find_host || delete_host) { 921 cp2 = host_hash(name, cp, strlen(cp)); 922 if (cp2 == NULL) { 923 error("line %d: invalid hashed " 924 "name: %.64s...", num, line); 925 invalid = 1; 926 continue; 927 } 928 c = (strcmp(cp2, cp) == 0); 929 if (find_host && c) { 930 printf("# Host %s found: " 931 "line %d type %s%s\n", name, 932 num, key_type(pub), 933 ca ? " (CA key)" : ""); 934 printhost(out, cp, pub, ca, 0); 935 } 936 if (delete_host && !c && !ca) 937 printhost(out, cp, pub, ca, 0); 938 } else if (hash_hosts) 939 printhost(out, cp, pub, ca, 0); 940 } else { 941 if (find_host || delete_host) { 942 c = (match_hostname(name, cp, 943 strlen(cp)) == 1); 944 if (find_host && c) { 945 printf("# Host %s found: " 946 "line %d type %s%s\n", name, 947 num, key_type(pub), 948 ca ? " (CA key)" : ""); 949 printhost(out, name, pub, 950 ca, hash_hosts && !ca); 951 } 952 if (delete_host && !c && !ca) 953 printhost(out, cp, pub, ca, 0); 954 } else if (hash_hosts) { 955 for (cp2 = strsep(&cp, ","); 956 cp2 != NULL && *cp2 != '\0'; 957 cp2 = strsep(&cp, ",")) { 958 if (ca) { 959 fprintf(stderr, "Warning: " 960 "ignoring CA key for host: " 961 "%.64s\n", cp2); 962 printhost(out, cp2, pub, ca, 0); 963 } else if (strcspn(cp2, "*?!") != 964 strlen(cp2)) { 965 fprintf(stderr, "Warning: " 966 "ignoring host name with " 967 "metacharacters: %.64s\n", 968 cp2); 969 printhost(out, cp2, pub, ca, 0); 970 } else 971 printhost(out, cp2, pub, ca, 1); 972 } 973 has_unhashed = 1; 974 } 975 } 976 key_free(pub); 977 } 978 fclose(in); 979 980 if (invalid) { 981 fprintf(stderr, "%s is not a valid known_hosts file.\n", 982 identity_file); 983 if (inplace) { 984 fprintf(stderr, "Not replacing existing known_hosts " 985 "file because of errors\n"); 986 fclose(out); 987 unlink(tmp); 988 } 989 exit(1); 990 } 991 992 if (inplace) { 993 fclose(out); 994 995 /* Backup existing file */ 996 if (unlink(old) == -1 && errno != ENOENT) 997 fatal("unlink %.100s: %s", old, strerror(errno)); 998 if (link(identity_file, old) == -1) 999 fatal("link %.100s to %.100s: %s", identity_file, old, 1000 strerror(errno)); 1001 /* Move new one into place */ 1002 if (rename(tmp, identity_file) == -1) { 1003 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1004 strerror(errno)); 1005 unlink(tmp); 1006 unlink(old); 1007 exit(1); 1008 } 1009 1010 fprintf(stderr, "%s updated.\n", identity_file); 1011 fprintf(stderr, "Original contents retained as %s\n", old); 1012 if (has_unhashed) { 1013 fprintf(stderr, "WARNING: %s contains unhashed " 1014 "entries\n", old); 1015 fprintf(stderr, "Delete this file to ensure privacy " 1016 "of hostnames\n"); 1017 } 1018 } 1019 1020 exit(0); 1021} 1022 1023/* 1024 * Perform changing a passphrase. The argument is the passwd structure 1025 * for the current user. 1026 */ 1027static void 1028do_change_passphrase(struct passwd *pw) 1029{ 1030 char *comment; 1031 char *old_passphrase, *passphrase1, *passphrase2; 1032 struct stat st; 1033 Key *private; 1034 1035 if (!have_identity) 1036 ask_filename(pw, "Enter file in which the key is"); 1037 if (stat(identity_file, &st) < 0) { 1038 perror(identity_file); 1039 exit(1); 1040 } 1041 /* Try to load the file with empty passphrase. */ 1042 private = key_load_private(identity_file, "", &comment); 1043 if (private == NULL) { 1044 if (identity_passphrase) 1045 old_passphrase = xstrdup(identity_passphrase); 1046 else 1047 old_passphrase = 1048 read_passphrase("Enter old passphrase: ", 1049 RP_ALLOW_STDIN); 1050 private = key_load_private(identity_file, old_passphrase, 1051 &comment); 1052 memset(old_passphrase, 0, strlen(old_passphrase)); 1053 xfree(old_passphrase); 1054 if (private == NULL) { 1055 printf("Bad passphrase.\n"); 1056 exit(1); 1057 } 1058 } 1059 printf("Key has comment '%s'\n", comment); 1060 1061 /* Ask the new passphrase (twice). */ 1062 if (identity_new_passphrase) { 1063 passphrase1 = xstrdup(identity_new_passphrase); 1064 passphrase2 = NULL; 1065 } else { 1066 passphrase1 = 1067 read_passphrase("Enter new passphrase (empty for no " 1068 "passphrase): ", RP_ALLOW_STDIN); 1069 passphrase2 = read_passphrase("Enter same passphrase again: ", 1070 RP_ALLOW_STDIN); 1071 1072 /* Verify that they are the same. */ 1073 if (strcmp(passphrase1, passphrase2) != 0) { 1074 memset(passphrase1, 0, strlen(passphrase1)); 1075 memset(passphrase2, 0, strlen(passphrase2)); 1076 xfree(passphrase1); 1077 xfree(passphrase2); 1078 printf("Pass phrases do not match. Try again.\n"); 1079 exit(1); 1080 } 1081 /* Destroy the other copy. */ 1082 memset(passphrase2, 0, strlen(passphrase2)); 1083 xfree(passphrase2); 1084 } 1085 1086 /* Save the file using the new passphrase. */ 1087 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1088 printf("Saving the key failed: %s.\n", identity_file); 1089 memset(passphrase1, 0, strlen(passphrase1)); 1090 xfree(passphrase1); 1091 key_free(private); 1092 xfree(comment); 1093 exit(1); 1094 } 1095 /* Destroy the passphrase and the copy of the key in memory. */ 1096 memset(passphrase1, 0, strlen(passphrase1)); 1097 xfree(passphrase1); 1098 key_free(private); /* Destroys contents */ 1099 xfree(comment); 1100 1101 printf("Your identification has been saved with the new passphrase.\n"); 1102 exit(0); 1103} 1104 1105/* 1106 * Print the SSHFP RR. 1107 */ 1108static int 1109do_print_resource_record(struct passwd *pw, char *fname, char *hname) 1110{ 1111 Key *public; 1112 char *comment = NULL; 1113 struct stat st; 1114 1115 if (fname == NULL) 1116 ask_filename(pw, "Enter file in which the key is"); 1117 if (stat(fname, &st) < 0) { 1118 if (errno == ENOENT) 1119 return 0; 1120 perror(fname); 1121 exit(1); 1122 } 1123 public = key_load_public(fname, &comment); 1124 if (public != NULL) { 1125 export_dns_rr(hname, public, stdout, print_generic); 1126 key_free(public); 1127 xfree(comment); 1128 return 1; 1129 } 1130 if (comment) 1131 xfree(comment); 1132 1133 printf("failed to read v2 public key from %s.\n", fname); 1134 exit(1); 1135} 1136 1137/* 1138 * Change the comment of a private key file. 1139 */ 1140static void 1141do_change_comment(struct passwd *pw) 1142{ 1143 char new_comment[1024], *comment, *passphrase; 1144 Key *private; 1145 Key *public; 1146 struct stat st; 1147 FILE *f; 1148 int fd; 1149 1150 if (!have_identity) 1151 ask_filename(pw, "Enter file in which the key is"); 1152 if (stat(identity_file, &st) < 0) { 1153 perror(identity_file); 1154 exit(1); 1155 } 1156 private = key_load_private(identity_file, "", &comment); 1157 if (private == NULL) { 1158 if (identity_passphrase) 1159 passphrase = xstrdup(identity_passphrase); 1160 else if (identity_new_passphrase) 1161 passphrase = xstrdup(identity_new_passphrase); 1162 else 1163 passphrase = read_passphrase("Enter passphrase: ", 1164 RP_ALLOW_STDIN); 1165 /* Try to load using the passphrase. */ 1166 private = key_load_private(identity_file, passphrase, &comment); 1167 if (private == NULL) { 1168 memset(passphrase, 0, strlen(passphrase)); 1169 xfree(passphrase); 1170 printf("Bad passphrase.\n"); 1171 exit(1); 1172 } 1173 } else { 1174 passphrase = xstrdup(""); 1175 } 1176 if (private->type != KEY_RSA1) { 1177 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 1178 key_free(private); 1179 exit(1); 1180 } 1181 printf("Key now has comment '%s'\n", comment); 1182 1183 if (identity_comment) { 1184 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1185 } else { 1186 printf("Enter new comment: "); 1187 fflush(stdout); 1188 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1189 memset(passphrase, 0, strlen(passphrase)); 1190 key_free(private); 1191 exit(1); 1192 } 1193 new_comment[strcspn(new_comment, "\n")] = '\0'; 1194 } 1195 1196 /* Save the file using the new passphrase. */ 1197 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 1198 printf("Saving the key failed: %s.\n", identity_file); 1199 memset(passphrase, 0, strlen(passphrase)); 1200 xfree(passphrase); 1201 key_free(private); 1202 xfree(comment); 1203 exit(1); 1204 } 1205 memset(passphrase, 0, strlen(passphrase)); 1206 xfree(passphrase); 1207 public = key_from_private(private); 1208 key_free(private); 1209 1210 strlcat(identity_file, ".pub", sizeof(identity_file)); 1211 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1212 if (fd == -1) { 1213 printf("Could not save your public key in %s\n", identity_file); 1214 exit(1); 1215 } 1216 f = fdopen(fd, "w"); 1217 if (f == NULL) { 1218 printf("fdopen %s failed\n", identity_file); 1219 exit(1); 1220 } 1221 if (!key_write(public, f)) 1222 fprintf(stderr, "write key failed\n"); 1223 key_free(public); 1224 fprintf(f, " %s\n", new_comment); 1225 fclose(f); 1226 1227 xfree(comment); 1228 1229 printf("The comment in your key file has been changed.\n"); 1230 exit(0); 1231} 1232 1233static const char * 1234fmt_validity(u_int64_t valid_from, u_int64_t valid_to) 1235{ 1236 char from[32], to[32]; 1237 static char ret[64]; 1238 time_t tt; 1239 struct tm *tm; 1240 1241 *from = *to = '\0'; 1242 if (valid_from == 0 && valid_to == 0xffffffffffffffffULL) 1243 return "forever"; 1244 1245 if (valid_from != 0) { 1246 /* XXX revisit INT_MAX in 2038 :) */ 1247 tt = valid_from > INT_MAX ? INT_MAX : valid_from; 1248 tm = localtime(&tt); 1249 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); 1250 } 1251 if (valid_to != 0xffffffffffffffffULL) { 1252 /* XXX revisit INT_MAX in 2038 :) */ 1253 tt = valid_to > INT_MAX ? INT_MAX : valid_to; 1254 tm = localtime(&tt); 1255 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); 1256 } 1257 1258 if (valid_from == 0) { 1259 snprintf(ret, sizeof(ret), "before %s", to); 1260 return ret; 1261 } 1262 if (valid_to == 0xffffffffffffffffULL) { 1263 snprintf(ret, sizeof(ret), "after %s", from); 1264 return ret; 1265 } 1266 1267 snprintf(ret, sizeof(ret), "from %s to %s", from, to); 1268 return ret; 1269} 1270 1271static void 1272add_flag_option(Buffer *c, const char *name) 1273{ 1274 debug3("%s: %s", __func__, name); 1275 buffer_put_cstring(c, name); 1276 buffer_put_string(c, NULL, 0); 1277} 1278 1279static void 1280add_string_option(Buffer *c, const char *name, const char *value) 1281{ 1282 Buffer b; 1283 1284 debug3("%s: %s=%s", __func__, name, value); 1285 buffer_init(&b); 1286 buffer_put_cstring(&b, value); 1287 1288 buffer_put_cstring(c, name); 1289 buffer_put_string(c, buffer_ptr(&b), buffer_len(&b)); 1290 1291 buffer_free(&b); 1292} 1293 1294#define OPTIONS_CRITICAL 1 1295#define OPTIONS_EXTENSIONS 2 1296static void 1297prepare_options_buf(Buffer *c, int which) 1298{ 1299 buffer_clear(c); 1300 if ((which & OPTIONS_CRITICAL) != 0 && 1301 certflags_command != NULL) 1302 add_string_option(c, "force-command", certflags_command); 1303 if ((which & OPTIONS_EXTENSIONS) != 0 && 1304 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1305 add_flag_option(c, "permit-agent-forwarding"); 1306 if ((which & OPTIONS_EXTENSIONS) != 0 && 1307 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1308 add_flag_option(c, "permit-port-forwarding"); 1309 if ((which & OPTIONS_EXTENSIONS) != 0 && 1310 (certflags_flags & CERTOPT_PTY) != 0) 1311 add_flag_option(c, "permit-pty"); 1312 if ((which & OPTIONS_EXTENSIONS) != 0 && 1313 (certflags_flags & CERTOPT_USER_RC) != 0) 1314 add_flag_option(c, "permit-user-rc"); 1315 if ((which & OPTIONS_EXTENSIONS) != 0 && 1316 (certflags_flags & CERTOPT_X_FWD) != 0) 1317 add_flag_option(c, "permit-X11-forwarding"); 1318 if ((which & OPTIONS_CRITICAL) != 0 && 1319 certflags_src_addr != NULL) 1320 add_string_option(c, "source-address", certflags_src_addr); 1321} 1322 1323static Key * 1324load_pkcs11_key(char *path) 1325{ 1326#ifdef ENABLE_PKCS11 1327 Key **keys = NULL, *public, *private = NULL; 1328 int i, nkeys; 1329 1330 if ((public = key_load_public(path, NULL)) == NULL) 1331 fatal("Couldn't load CA public key \"%s\"", path); 1332 1333 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1334 debug3("%s: %d keys", __func__, nkeys); 1335 if (nkeys <= 0) 1336 fatal("cannot read public key from pkcs11"); 1337 for (i = 0; i < nkeys; i++) { 1338 if (key_equal_public(public, keys[i])) { 1339 private = keys[i]; 1340 continue; 1341 } 1342 key_free(keys[i]); 1343 } 1344 xfree(keys); 1345 key_free(public); 1346 return private; 1347#else 1348 fatal("no pkcs11 support"); 1349#endif /* ENABLE_PKCS11 */ 1350} 1351 1352static void 1353do_ca_sign(struct passwd *pw, int argc, char **argv) 1354{ 1355 int i, fd; 1356 u_int n; 1357 Key *ca, *public; 1358 char *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1359 FILE *f; 1360 int v00 = 0; /* legacy keys */ 1361 1362 if (key_type_name != NULL) { 1363 switch (key_type_from_name(key_type_name)) { 1364 case KEY_RSA_CERT_V00: 1365 case KEY_DSA_CERT_V00: 1366 v00 = 1; 1367 break; 1368 case KEY_UNSPEC: 1369 if (strcasecmp(key_type_name, "v00") == 0) { 1370 v00 = 1; 1371 break; 1372 } else if (strcasecmp(key_type_name, "v01") == 0) 1373 break; 1374 /* FALLTHROUGH */ 1375 default: 1376 fprintf(stderr, "unknown key type %s\n", key_type_name); 1377 exit(1); 1378 } 1379 } 1380 1381 pkcs11_init(1); 1382 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1383 if (pkcs11provider != NULL) { 1384 if ((ca = load_pkcs11_key(tmp)) == NULL) 1385 fatal("No PKCS#11 key matching %s found", ca_key_path); 1386 } else if ((ca = load_identity(tmp)) == NULL) 1387 fatal("Couldn't load CA key \"%s\"", tmp); 1388 xfree(tmp); 1389 1390 for (i = 0; i < argc; i++) { 1391 /* Split list of principals */ 1392 n = 0; 1393 if (cert_principals != NULL) { 1394 otmp = tmp = xstrdup(cert_principals); 1395 plist = NULL; 1396 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1397 plist = xrealloc(plist, n + 1, sizeof(*plist)); 1398 if (*(plist[n] = xstrdup(cp)) == '\0') 1399 fatal("Empty principal name"); 1400 } 1401 xfree(otmp); 1402 } 1403 1404 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1405 if ((public = key_load_public(tmp, &comment)) == NULL) 1406 fatal("%s: unable to open \"%s\"", __func__, tmp); 1407 if (public->type != KEY_RSA && public->type != KEY_DSA) 1408 fatal("%s: key \"%s\" type %s cannot be certified", 1409 __func__, tmp, key_type(public)); 1410 1411 /* Prepare certificate to sign */ 1412 if (key_to_certified(public, v00) != 0) 1413 fatal("Could not upgrade key %s to certificate", tmp); 1414 public->cert->type = cert_key_type; 1415 public->cert->serial = (u_int64_t)cert_serial; 1416 public->cert->key_id = xstrdup(cert_key_id); 1417 public->cert->nprincipals = n; 1418 public->cert->principals = plist; 1419 public->cert->valid_after = cert_valid_from; 1420 public->cert->valid_before = cert_valid_to; 1421 if (v00) { 1422 prepare_options_buf(&public->cert->critical, 1423 OPTIONS_CRITICAL|OPTIONS_EXTENSIONS); 1424 } else { 1425 prepare_options_buf(&public->cert->critical, 1426 OPTIONS_CRITICAL); 1427 prepare_options_buf(&public->cert->extensions, 1428 OPTIONS_EXTENSIONS); 1429 } 1430 public->cert->signature_key = key_from_private(ca); 1431 1432 if (key_certify(public, ca) != 0) 1433 fatal("Couldn't not certify key %s", tmp); 1434 1435 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1436 *cp = '\0'; 1437 xasprintf(&out, "%s-cert.pub", tmp); 1438 xfree(tmp); 1439 1440 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1441 fatal("Could not open \"%s\" for writing: %s", out, 1442 strerror(errno)); 1443 if ((f = fdopen(fd, "w")) == NULL) 1444 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1445 if (!key_write(public, f)) 1446 fatal("Could not write certified key to %s", out); 1447 fprintf(f, " %s\n", comment); 1448 fclose(f); 1449 1450 if (!quiet) { 1451 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1452 "valid %s", key_cert_type(public), 1453 out, public->cert->key_id, public->cert->serial, 1454 cert_principals != NULL ? " for " : "", 1455 cert_principals != NULL ? cert_principals : "", 1456 fmt_validity(cert_valid_from, cert_valid_to)); 1457 } 1458 1459 key_free(public); 1460 xfree(out); 1461 } 1462 pkcs11_terminate(); 1463 exit(0); 1464} 1465 1466static u_int64_t 1467parse_relative_time(const char *s, time_t now) 1468{ 1469 int64_t mul, secs; 1470 1471 mul = *s == '-' ? -1 : 1; 1472 1473 if ((secs = convtime(s + 1)) == -1) 1474 fatal("Invalid relative certificate time %s", s); 1475 if (mul == -1 && secs > now) 1476 fatal("Certificate time %s cannot be represented", s); 1477 return now + (u_int64_t)(secs * mul); 1478} 1479 1480static u_int64_t 1481parse_absolute_time(const char *s) 1482{ 1483 struct tm tm; 1484 time_t tt; 1485 char buf[32], *fmt; 1486 1487 /* 1488 * POSIX strptime says "The application shall ensure that there 1489 * is white-space or other non-alphanumeric characters between 1490 * any two conversion specifications" so arrange things this way. 1491 */ 1492 switch (strlen(s)) { 1493 case 8: 1494 fmt = "%Y-%m-%d"; 1495 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1496 break; 1497 case 14: 1498 fmt = "%Y-%m-%dT%H:%M:%S"; 1499 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1500 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1501 break; 1502 default: 1503 fatal("Invalid certificate time format %s", s); 1504 } 1505 1506 bzero(&tm, sizeof(tm)); 1507 if (strptime(buf, fmt, &tm) == NULL) 1508 fatal("Invalid certificate time %s", s); 1509 if ((tt = mktime(&tm)) < 0) 1510 fatal("Certificate time %s cannot be represented", s); 1511 return (u_int64_t)tt; 1512} 1513 1514static void 1515parse_cert_times(char *timespec) 1516{ 1517 char *from, *to; 1518 time_t now = time(NULL); 1519 int64_t secs; 1520 1521 /* +timespec relative to now */ 1522 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1523 if ((secs = convtime(timespec + 1)) == -1) 1524 fatal("Invalid relative certificate life %s", timespec); 1525 cert_valid_to = now + secs; 1526 /* 1527 * Backdate certificate one minute to avoid problems on hosts 1528 * with poorly-synchronised clocks. 1529 */ 1530 cert_valid_from = ((now - 59)/ 60) * 60; 1531 return; 1532 } 1533 1534 /* 1535 * from:to, where 1536 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1537 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1538 */ 1539 from = xstrdup(timespec); 1540 to = strchr(from, ':'); 1541 if (to == NULL || from == to || *(to + 1) == '\0') 1542 fatal("Invalid certificate life specification %s", timespec); 1543 *to++ = '\0'; 1544 1545 if (*from == '-' || *from == '+') 1546 cert_valid_from = parse_relative_time(from, now); 1547 else 1548 cert_valid_from = parse_absolute_time(from); 1549 1550 if (*to == '-' || *to == '+') 1551 cert_valid_to = parse_relative_time(to, cert_valid_from); 1552 else 1553 cert_valid_to = parse_absolute_time(to); 1554 1555 if (cert_valid_to <= cert_valid_from) 1556 fatal("Empty certificate validity interval"); 1557 xfree(from); 1558} 1559 1560static void 1561add_cert_option(char *opt) 1562{ 1563 char *val; 1564 1565 if (strcmp(opt, "clear") == 0) 1566 certflags_flags = 0; 1567 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1568 certflags_flags &= ~CERTOPT_X_FWD; 1569 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1570 certflags_flags |= CERTOPT_X_FWD; 1571 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1572 certflags_flags &= ~CERTOPT_AGENT_FWD; 1573 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1574 certflags_flags |= CERTOPT_AGENT_FWD; 1575 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1576 certflags_flags &= ~CERTOPT_PORT_FWD; 1577 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1578 certflags_flags |= CERTOPT_PORT_FWD; 1579 else if (strcasecmp(opt, "no-pty") == 0) 1580 certflags_flags &= ~CERTOPT_PTY; 1581 else if (strcasecmp(opt, "permit-pty") == 0) 1582 certflags_flags |= CERTOPT_PTY; 1583 else if (strcasecmp(opt, "no-user-rc") == 0) 1584 certflags_flags &= ~CERTOPT_USER_RC; 1585 else if (strcasecmp(opt, "permit-user-rc") == 0) 1586 certflags_flags |= CERTOPT_USER_RC; 1587 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1588 val = opt + 14; 1589 if (*val == '\0') 1590 fatal("Empty force-command option"); 1591 if (certflags_command != NULL) 1592 fatal("force-command already specified"); 1593 certflags_command = xstrdup(val); 1594 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1595 val = opt + 15; 1596 if (*val == '\0') 1597 fatal("Empty source-address option"); 1598 if (certflags_src_addr != NULL) 1599 fatal("source-address already specified"); 1600 if (addr_match_cidr_list(NULL, val) != 0) 1601 fatal("Invalid source-address list"); 1602 certflags_src_addr = xstrdup(val); 1603 } else 1604 fatal("Unsupported certificate option \"%s\"", opt); 1605} 1606 1607static void 1608show_options(const Buffer *optbuf, int v00, int in_critical) 1609{ 1610 u_char *name, *data; 1611 u_int dlen; 1612 Buffer options, option; 1613 1614 buffer_init(&options); 1615 buffer_append(&options, buffer_ptr(optbuf), buffer_len(optbuf)); 1616 1617 buffer_init(&option); 1618 while (buffer_len(&options) != 0) { 1619 name = buffer_get_string(&options, NULL); 1620 data = buffer_get_string_ptr(&options, &dlen); 1621 buffer_append(&option, data, dlen); 1622 printf(" %s", name); 1623 if ((v00 || !in_critical) && 1624 (strcmp(name, "permit-X11-forwarding") == 0 || 1625 strcmp(name, "permit-agent-forwarding") == 0 || 1626 strcmp(name, "permit-port-forwarding") == 0 || 1627 strcmp(name, "permit-pty") == 0 || 1628 strcmp(name, "permit-user-rc") == 0)) 1629 printf("\n"); 1630 else if ((v00 || in_critical) && 1631 (strcmp(name, "force-command") == 0 || 1632 strcmp(name, "source-address") == 0)) { 1633 data = buffer_get_string(&option, NULL); 1634 printf(" %s\n", data); 1635 xfree(data); 1636 } else { 1637 printf(" UNKNOWN OPTION (len %u)\n", 1638 buffer_len(&option)); 1639 buffer_clear(&option); 1640 } 1641 xfree(name); 1642 if (buffer_len(&option) != 0) 1643 fatal("Option corrupt: extra data at end"); 1644 } 1645 buffer_free(&option); 1646 buffer_free(&options); 1647} 1648 1649static void 1650do_show_cert(struct passwd *pw) 1651{ 1652 Key *key; 1653 struct stat st; 1654 char *key_fp, *ca_fp; 1655 u_int i, v00; 1656 1657 if (!have_identity) 1658 ask_filename(pw, "Enter file in which the key is"); 1659 if (stat(identity_file, &st) < 0) 1660 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1661 if ((key = key_load_public(identity_file, NULL)) == NULL) 1662 fatal("%s is not a public key", identity_file); 1663 if (!key_is_cert(key)) 1664 fatal("%s is not a certificate", identity_file); 1665 v00 = key->type == KEY_RSA_CERT_V00 || key->type == KEY_DSA_CERT_V00; 1666 1667 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); 1668 ca_fp = key_fingerprint(key->cert->signature_key, 1669 SSH_FP_MD5, SSH_FP_HEX); 1670 1671 printf("%s:\n", identity_file); 1672 printf(" Type: %s %s certificate\n", key_ssh_name(key), 1673 key_cert_type(key)); 1674 printf(" Public key: %s %s\n", key_type(key), key_fp); 1675 printf(" Signing CA: %s %s\n", 1676 key_type(key->cert->signature_key), ca_fp); 1677 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1678 if (!v00) 1679 printf(" Serial: %llu\n", key->cert->serial); 1680 printf(" Valid: %s\n", 1681 fmt_validity(key->cert->valid_after, key->cert->valid_before)); 1682 printf(" Principals: "); 1683 if (key->cert->nprincipals == 0) 1684 printf("(none)\n"); 1685 else { 1686 for (i = 0; i < key->cert->nprincipals; i++) 1687 printf("\n %s", 1688 key->cert->principals[i]); 1689 printf("\n"); 1690 } 1691 printf(" Critical Options: "); 1692 if (buffer_len(&key->cert->critical) == 0) 1693 printf("(none)\n"); 1694 else { 1695 printf("\n"); 1696 show_options(&key->cert->critical, v00, 1); 1697 } 1698 if (!v00) { 1699 printf(" Extensions: "); 1700 if (buffer_len(&key->cert->extensions) == 0) 1701 printf("(none)\n"); 1702 else { 1703 printf("\n"); 1704 show_options(&key->cert->extensions, v00, 0); 1705 } 1706 } 1707 exit(0); 1708} 1709 1710static void 1711usage(void) 1712{ 1713 fprintf(stderr, "usage: %s [options]\n", __progname); 1714 fprintf(stderr, "Options:\n"); 1715 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); 1716 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 1717 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 1718 fprintf(stderr, " -C comment Provide new comment.\n"); 1719 fprintf(stderr, " -c Change comment in private and public key files.\n"); 1720#ifdef ENABLE_PKCS11 1721 fprintf(stderr, " -D pkcs11 Download public key from pkcs11 token.\n"); 1722#endif 1723 fprintf(stderr, " -e Export OpenSSH to foreign format key file.\n"); 1724 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); 1725 fprintf(stderr, " -f filename Filename of the key file.\n"); 1726 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); 1727 fprintf(stderr, " -g Use generic DNS resource record format.\n"); 1728 fprintf(stderr, " -H Hash names in known_hosts file.\n"); 1729 fprintf(stderr, " -h Generate host certificate instead of a user certificate.\n"); 1730 fprintf(stderr, " -I key_id Key identifier to include in certificate.\n"); 1731 fprintf(stderr, " -i Import foreign format to OpenSSH key file.\n"); 1732 fprintf(stderr, " -L Print the contents of a certificate.\n"); 1733 fprintf(stderr, " -l Show fingerprint of key file.\n"); 1734 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); 1735 fprintf(stderr, " -m key_fmt Conversion format for -e/-i (PEM|PKCS8|RFC4716).\n"); 1736 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 1737 fprintf(stderr, " -n name,... User/host principal names to include in certificate\n"); 1738 fprintf(stderr, " -O option Specify a certificate option.\n"); 1739 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 1740 fprintf(stderr, " -p Change passphrase of private key file.\n"); 1741 fprintf(stderr, " -q Quiet.\n"); 1742 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); 1743 fprintf(stderr, " -r hostname Print DNS resource record.\n"); 1744 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); 1745 fprintf(stderr, " -s ca_key Certify keys with CA key.\n"); 1746 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); 1747 fprintf(stderr, " -t type Specify type of key to create.\n"); 1748 fprintf(stderr, " -V from:to Specify certificate validity interval.\n"); 1749 fprintf(stderr, " -v Verbose.\n"); 1750 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); 1751 fprintf(stderr, " -y Read private key file and print public key.\n"); 1752 fprintf(stderr, " -z serial Specify a serial number.\n"); 1753 1754 exit(1); 1755} 1756 1757/* 1758 * Main program for key management. 1759 */ 1760int 1761main(int argc, char **argv) 1762{ 1763 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 1764 char out_file[MAXPATHLEN], *rr_hostname = NULL; 1765 Key *private, *public; 1766 struct passwd *pw; 1767 struct stat st; 1768 int opt, type, fd; 1769 u_int maxbits; 1770 u_int32_t memory = 0, generator_wanted = 0, trials = 100; 1771 int do_gen_candidates = 0, do_screen_candidates = 0; 1772 BIGNUM *start = NULL; 1773 FILE *f; 1774 const char *errstr; 1775 1776 extern int optind; 1777 extern char *optarg; 1778 1779 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 1780 sanitise_stdfd(); 1781 1782 __progname = ssh_get_progname(argv[0]); 1783 1784 SSLeay_add_all_algorithms(); 1785 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 1786 1787 init_rng(); 1788 seed_rng(); 1789 1790 /* we need this for the home * directory. */ 1791 pw = getpwuid(getuid()); 1792 if (!pw) { 1793 printf("You don't exist, go away!\n"); 1794 exit(1); 1795 } 1796 if (gethostname(hostname, sizeof(hostname)) < 0) { 1797 perror("gethostname"); 1798 exit(1); 1799 } 1800 1801 while ((opt = getopt(argc, argv, "degiqpclBHLhvxXyF:b:f:t:D:I:P:m:N:n:" 1802 "O:C:r:g:R:T:G:M:S:s:a:V:W:z:")) != -1) { 1803 switch (opt) { 1804 case 'b': 1805 bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr); 1806 if (errstr) 1807 fatal("Bits has bad value %s (%s)", 1808 optarg, errstr); 1809 break; 1810 case 'F': 1811 find_host = 1; 1812 rr_hostname = optarg; 1813 break; 1814 case 'H': 1815 hash_hosts = 1; 1816 break; 1817 case 'I': 1818 cert_key_id = optarg; 1819 break; 1820 case 'R': 1821 delete_host = 1; 1822 rr_hostname = optarg; 1823 break; 1824 case 'L': 1825 show_cert = 1; 1826 break; 1827 case 'l': 1828 print_fingerprint = 1; 1829 break; 1830 case 'B': 1831 print_bubblebabble = 1; 1832 break; 1833 case 'm': 1834 if (strcasecmp(optarg, "RFC4716") == 0 || 1835 strcasecmp(optarg, "ssh2") == 0) { 1836 convert_format = FMT_RFC4716; 1837 break; 1838 } 1839 if (strcasecmp(optarg, "PKCS8") == 0) { 1840 convert_format = FMT_PKCS8; 1841 break; 1842 } 1843 if (strcasecmp(optarg, "PEM") == 0) { 1844 convert_format = FMT_PEM; 1845 break; 1846 } 1847 fatal("Unsupported conversion format \"%s\"", optarg); 1848 case 'n': 1849 cert_principals = optarg; 1850 break; 1851 case 'p': 1852 change_passphrase = 1; 1853 break; 1854 case 'c': 1855 change_comment = 1; 1856 break; 1857 case 'f': 1858 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= 1859 sizeof(identity_file)) 1860 fatal("Identity filename too long"); 1861 have_identity = 1; 1862 break; 1863 case 'g': 1864 print_generic = 1; 1865 break; 1866 case 'P': 1867 identity_passphrase = optarg; 1868 break; 1869 case 'N': 1870 identity_new_passphrase = optarg; 1871 break; 1872 case 'O': 1873 add_cert_option(optarg); 1874 break; 1875 case 'C': 1876 identity_comment = optarg; 1877 break; 1878 case 'q': 1879 quiet = 1; 1880 break; 1881 case 'e': 1882 case 'x': 1883 /* export key */ 1884 convert_to = 1; 1885 break; 1886 case 'h': 1887 cert_key_type = SSH2_CERT_TYPE_HOST; 1888 certflags_flags = 0; 1889 break; 1890 case 'i': 1891 case 'X': 1892 /* import key */ 1893 convert_from = 1; 1894 break; 1895 case 'y': 1896 print_public = 1; 1897 break; 1898 case 'd': 1899 key_type_name = "dsa"; 1900 break; 1901 case 's': 1902 ca_key_path = optarg; 1903 break; 1904 case 't': 1905 key_type_name = optarg; 1906 break; 1907 case 'D': 1908 pkcs11provider = optarg; 1909 break; 1910 case 'v': 1911 if (log_level == SYSLOG_LEVEL_INFO) 1912 log_level = SYSLOG_LEVEL_DEBUG1; 1913 else { 1914 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 1915 log_level < SYSLOG_LEVEL_DEBUG3) 1916 log_level++; 1917 } 1918 break; 1919 case 'r': 1920 rr_hostname = optarg; 1921 break; 1922 case 'W': 1923 generator_wanted = (u_int32_t)strtonum(optarg, 1, 1924 UINT_MAX, &errstr); 1925 if (errstr) 1926 fatal("Desired generator has bad value: %s (%s)", 1927 optarg, errstr); 1928 break; 1929 case 'a': 1930 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 1931 if (errstr) 1932 fatal("Invalid number of trials: %s (%s)", 1933 optarg, errstr); 1934 break; 1935 case 'M': 1936 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); 1937 if (errstr) 1938 fatal("Memory limit is %s: %s", errstr, optarg); 1939 break; 1940 case 'G': 1941 do_gen_candidates = 1; 1942 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 1943 sizeof(out_file)) 1944 fatal("Output filename too long"); 1945 break; 1946 case 'T': 1947 do_screen_candidates = 1; 1948 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 1949 sizeof(out_file)) 1950 fatal("Output filename too long"); 1951 break; 1952 case 'S': 1953 /* XXX - also compare length against bits */ 1954 if (BN_hex2bn(&start, optarg) == 0) 1955 fatal("Invalid start point."); 1956 break; 1957 case 'V': 1958 parse_cert_times(optarg); 1959 break; 1960 case 'z': 1961 cert_serial = strtonum(optarg, 0, LLONG_MAX, &errstr); 1962 if (errstr) 1963 fatal("Invalid serial number: %s", errstr); 1964 break; 1965 case '?': 1966 default: 1967 usage(); 1968 } 1969 } 1970 1971 /* reinit */ 1972 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 1973 1974 argv += optind; 1975 argc -= optind; 1976 1977 if (ca_key_path != NULL) { 1978 if (argc < 1) { 1979 printf("Too few arguments.\n"); 1980 usage(); 1981 } 1982 } else if (argc > 0) { 1983 printf("Too many arguments.\n"); 1984 usage(); 1985 } 1986 if (change_passphrase && change_comment) { 1987 printf("Can only have one of -p and -c.\n"); 1988 usage(); 1989 } 1990 if (print_fingerprint && (delete_host || hash_hosts)) { 1991 printf("Cannot use -l with -D or -R.\n"); 1992 usage(); 1993 } 1994 if (ca_key_path != NULL) { 1995 if (cert_key_id == NULL) 1996 fatal("Must specify key id (-I) when certifying"); 1997 do_ca_sign(pw, argc, argv); 1998 } 1999 if (show_cert) 2000 do_show_cert(pw); 2001 if (delete_host || hash_hosts || find_host) 2002 do_known_hosts(pw, rr_hostname); 2003 if (print_fingerprint || print_bubblebabble) 2004 do_fingerprint(pw); 2005 if (change_passphrase) 2006 do_change_passphrase(pw); 2007 if (change_comment) 2008 do_change_comment(pw); 2009 if (convert_to) 2010 do_convert_to(pw); 2011 if (convert_from) 2012 do_convert_from(pw); 2013 if (print_public) 2014 do_print_public(pw); 2015 if (rr_hostname != NULL) { 2016 unsigned int n = 0; 2017 2018 if (have_identity) { 2019 n = do_print_resource_record(pw, 2020 identity_file, rr_hostname); 2021 if (n == 0) { 2022 perror(identity_file); 2023 exit(1); 2024 } 2025 exit(0); 2026 } else { 2027 2028 n += do_print_resource_record(pw, 2029 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2030 n += do_print_resource_record(pw, 2031 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2032 2033 if (n == 0) 2034 fatal("no keys found."); 2035 exit(0); 2036 } 2037 } 2038 if (pkcs11provider != NULL) 2039 do_download(pw); 2040 2041 if (do_gen_candidates) { 2042 FILE *out = fopen(out_file, "w"); 2043 2044 if (out == NULL) { 2045 error("Couldn't open modulus candidate file \"%s\": %s", 2046 out_file, strerror(errno)); 2047 return (1); 2048 } 2049 if (bits == 0) 2050 bits = DEFAULT_BITS; 2051 if (gen_candidates(out, memory, bits, start) != 0) 2052 fatal("modulus candidate generation failed"); 2053 2054 return (0); 2055 } 2056 2057 if (do_screen_candidates) { 2058 FILE *in; 2059 FILE *out = fopen(out_file, "w"); 2060 2061 if (have_identity && strcmp(identity_file, "-") != 0) { 2062 if ((in = fopen(identity_file, "r")) == NULL) { 2063 fatal("Couldn't open modulus candidate " 2064 "file \"%s\": %s", identity_file, 2065 strerror(errno)); 2066 } 2067 } else 2068 in = stdin; 2069 2070 if (out == NULL) { 2071 fatal("Couldn't open moduli file \"%s\": %s", 2072 out_file, strerror(errno)); 2073 } 2074 if (prime_test(in, out, trials, generator_wanted) != 0) 2075 fatal("modulus screening failed"); 2076 return (0); 2077 } 2078 2079 arc4random_stir(); 2080 2081 if (key_type_name == NULL) 2082 key_type_name = "rsa"; 2083 2084 type = key_type_from_name(key_type_name); 2085 if (type == KEY_UNSPEC) { 2086 fprintf(stderr, "unknown key type %s\n", key_type_name); 2087 exit(1); 2088 } 2089 if (bits == 0) 2090 bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS; 2091 maxbits = (type == KEY_DSA) ? 2092 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 2093 if (bits > maxbits) { 2094 fprintf(stderr, "key bits exceeds maximum %d\n", maxbits); 2095 exit(1); 2096 } 2097 if (type == KEY_DSA && bits != 1024) 2098 fatal("DSA keys must be 1024 bits"); 2099 if (!quiet) 2100 printf("Generating public/private %s key pair.\n", key_type_name); 2101 private = key_generate(type, bits); 2102 if (private == NULL) { 2103 fprintf(stderr, "key_generate failed\n"); 2104 exit(1); 2105 } 2106 public = key_from_private(private); 2107 2108 if (!have_identity) 2109 ask_filename(pw, "Enter file in which to save the key"); 2110 2111 /* Create ~/.ssh directory if it doesn't already exist. */ 2112 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2113 pw->pw_dir, _PATH_SSH_USER_DIR); 2114 if (strstr(identity_file, dotsshdir) != NULL) { 2115 if (stat(dotsshdir, &st) < 0) { 2116 if (errno != ENOENT) { 2117 error("Could not stat %s: %s", dotsshdir, 2118 strerror(errno)); 2119 } else if (mkdir(dotsshdir, 0700) < 0) { 2120 error("Could not create directory '%s': %s", 2121 dotsshdir, strerror(errno)); 2122 } else if (!quiet) 2123 printf("Created directory '%s'.\n", dotsshdir); 2124 } 2125 } 2126 /* If the file already exists, ask the user to confirm. */ 2127 if (stat(identity_file, &st) >= 0) { 2128 char yesno[3]; 2129 printf("%s already exists.\n", identity_file); 2130 printf("Overwrite (y/n)? "); 2131 fflush(stdout); 2132 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2133 exit(1); 2134 if (yesno[0] != 'y' && yesno[0] != 'Y') 2135 exit(1); 2136 } 2137 /* Ask for a passphrase (twice). */ 2138 if (identity_passphrase) 2139 passphrase1 = xstrdup(identity_passphrase); 2140 else if (identity_new_passphrase) 2141 passphrase1 = xstrdup(identity_new_passphrase); 2142 else { 2143passphrase_again: 2144 passphrase1 = 2145 read_passphrase("Enter passphrase (empty for no " 2146 "passphrase): ", RP_ALLOW_STDIN); 2147 passphrase2 = read_passphrase("Enter same passphrase again: ", 2148 RP_ALLOW_STDIN); 2149 if (strcmp(passphrase1, passphrase2) != 0) { 2150 /* 2151 * The passphrases do not match. Clear them and 2152 * retry. 2153 */ 2154 memset(passphrase1, 0, strlen(passphrase1)); 2155 memset(passphrase2, 0, strlen(passphrase2)); 2156 xfree(passphrase1); 2157 xfree(passphrase2); 2158 printf("Passphrases do not match. Try again.\n"); 2159 goto passphrase_again; 2160 } 2161 /* Clear the other copy of the passphrase. */ 2162 memset(passphrase2, 0, strlen(passphrase2)); 2163 xfree(passphrase2); 2164 } 2165 2166 if (identity_comment) { 2167 strlcpy(comment, identity_comment, sizeof(comment)); 2168 } else { 2169 /* Create default comment field for the passphrase. */ 2170 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2171 } 2172 2173 /* Save the key with the given passphrase and comment. */ 2174 if (!key_save_private(private, identity_file, passphrase1, comment)) { 2175 printf("Saving the key failed: %s.\n", identity_file); 2176 memset(passphrase1, 0, strlen(passphrase1)); 2177 xfree(passphrase1); 2178 exit(1); 2179 } 2180 /* Clear the passphrase. */ 2181 memset(passphrase1, 0, strlen(passphrase1)); 2182 xfree(passphrase1); 2183 2184 /* Clear the private key and the random number generator. */ 2185 key_free(private); 2186 arc4random_stir(); 2187 2188 if (!quiet) 2189 printf("Your identification has been saved in %s.\n", identity_file); 2190 2191 strlcat(identity_file, ".pub", sizeof(identity_file)); 2192 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 2193 if (fd == -1) { 2194 printf("Could not save your public key in %s\n", identity_file); 2195 exit(1); 2196 } 2197 f = fdopen(fd, "w"); 2198 if (f == NULL) { 2199 printf("fdopen %s failed\n", identity_file); 2200 exit(1); 2201 } 2202 if (!key_write(public, f)) 2203 fprintf(stderr, "write key failed\n"); 2204 fprintf(f, " %s\n", comment); 2205 fclose(f); 2206 2207 if (!quiet) { 2208 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 2209 char *ra = key_fingerprint(public, SSH_FP_MD5, 2210 SSH_FP_RANDOMART); 2211 printf("Your public key has been saved in %s.\n", 2212 identity_file); 2213 printf("The key fingerprint is:\n"); 2214 printf("%s %s\n", fp, comment); 2215 printf("The key's randomart image is:\n"); 2216 printf("%s\n", ra); 2217 xfree(ra); 2218 xfree(fp); 2219 } 2220 2221 key_free(public); 2222 exit(0); 2223} 2224