1 /* $OpenBSD: ssh-keygen.c,v 1.307 2017/07/07 03:53:12 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 21 #ifdef WITH_OPENSSL 22 #include <openssl/evp.h> 23 #include <openssl/pem.h> 24 #include "openbsd-compat/openssl-compat.h" 25 #endif 26 27 #include <errno.h> 28 #include <fcntl.h> 29 #include <netdb.h> 30 #ifdef HAVE_PATHS_H 31 # include <paths.h> 32 #endif 33 #include <pwd.h> 34 #include <stdarg.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 #include <limits.h> 40 #include <locale.h> 41 42 #include "xmalloc.h" 43 #include "sshkey.h" 44 #include "authfile.h" 45 #include "uuencode.h" 46 #include "sshbuf.h" 47 #include "pathnames.h" 48 #include "log.h" 49 #include "misc.h" 50 #include "match.h" 51 #include "hostfile.h" 52 #include "dns.h" 53 #include "ssh.h" 54 #include "ssh2.h" 55 #include "ssherr.h" 56 #include "ssh-pkcs11.h" 57 #include "atomicio.h" 58 #include "krl.h" 59 #include "digest.h" 60 #include "utf8.h" 61 #include "authfd.h" 62 63 #ifdef WITH_OPENSSL 64 # define DEFAULT_KEY_TYPE_NAME "rsa" 65 #else 66 # define DEFAULT_KEY_TYPE_NAME "ed25519" 67 #endif 68 69 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */ 70 #define DEFAULT_BITS 2048 71 #define DEFAULT_BITS_DSA 1024 72 #define DEFAULT_BITS_ECDSA 256 73 u_int32_t bits = 0; 74 75 /* 76 * Flag indicating that we just want to change the passphrase. This can be 77 * set on the command line. 78 */ 79 int change_passphrase = 0; 80 81 /* 82 * Flag indicating that we just want to change the comment. This can be set 83 * on the command line. 84 */ 85 int change_comment = 0; 86 87 int quiet = 0; 88 89 int log_level = SYSLOG_LEVEL_INFO; 90 91 /* Flag indicating that we want to hash a known_hosts file */ 92 int hash_hosts = 0; 93 /* Flag indicating that we want lookup a host in known_hosts file */ 94 int find_host = 0; 95 /* Flag indicating that we want to delete a host from a known_hosts file */ 96 int delete_host = 0; 97 98 /* Flag indicating that we want to show the contents of a certificate */ 99 int show_cert = 0; 100 101 /* Flag indicating that we just want to see the key fingerprint */ 102 int print_fingerprint = 0; 103 int print_bubblebabble = 0; 104 105 /* Hash algorithm to use for fingerprints. */ 106 int fingerprint_hash = SSH_FP_HASH_DEFAULT; 107 108 /* The identity file name, given on the command line or entered by the user. */ 109 char identity_file[1024]; 110 int have_identity = 0; 111 112 /* This is set to the passphrase if given on the command line. */ 113 char *identity_passphrase = NULL; 114 115 /* This is set to the new passphrase if given on the command line. */ 116 char *identity_new_passphrase = NULL; 117 118 /* This is set to the new comment if given on the command line. */ 119 char *identity_comment = NULL; 120 121 /* Path to CA key when certifying keys. */ 122 char *ca_key_path = NULL; 123 124 /* Prefer to use agent keys for CA signing */ 125 int prefer_agent = 0; 126 127 /* Certificate serial number */ 128 unsigned long long cert_serial = 0; 129 130 /* Key type when certifying */ 131 u_int cert_key_type = SSH2_CERT_TYPE_USER; 132 133 /* "key ID" of signed key */ 134 char *cert_key_id = NULL; 135 136 /* Comma-separated list of principal names for certifying keys */ 137 char *cert_principals = NULL; 138 139 /* Validity period for certificates */ 140 u_int64_t cert_valid_from = 0; 141 u_int64_t cert_valid_to = ~0ULL; 142 143 /* Certificate options */ 144 #define CERTOPT_X_FWD (1) 145 #define CERTOPT_AGENT_FWD (1<<1) 146 #define CERTOPT_PORT_FWD (1<<2) 147 #define CERTOPT_PTY (1<<3) 148 #define CERTOPT_USER_RC (1<<4) 149 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 150 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 151 u_int32_t certflags_flags = CERTOPT_DEFAULT; 152 char *certflags_command = NULL; 153 char *certflags_src_addr = NULL; 154 155 /* Arbitrary extensions specified by user */ 156 struct cert_userext { 157 char *key; 158 char *val; 159 int crit; 160 }; 161 struct cert_userext *cert_userext; 162 size_t ncert_userext; 163 164 /* Conversion to/from various formats */ 165 int convert_to = 0; 166 int convert_from = 0; 167 enum { 168 FMT_RFC4716, 169 FMT_PKCS8, 170 FMT_PEM 171 } convert_format = FMT_RFC4716; 172 int print_public = 0; 173 int print_generic = 0; 174 175 char *key_type_name = NULL; 176 177 /* Load key from this PKCS#11 provider */ 178 char *pkcs11provider = NULL; 179 180 /* Use new OpenSSH private key format when writing SSH2 keys instead of PEM */ 181 int use_new_format = 0; 182 183 /* Cipher for new-format private keys */ 184 char *new_format_cipher = NULL; 185 186 /* 187 * Number of KDF rounds to derive new format keys / 188 * number of primality trials when screening moduli. 189 */ 190 int rounds = 0; 191 192 /* argv0 */ 193 extern char *__progname; 194 195 char hostname[NI_MAXHOST]; 196 197 #ifdef WITH_OPENSSL 198 /* moduli.c */ 199 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 200 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 201 unsigned long); 202 #endif 203 204 static void 205 type_bits_valid(int type, const char *name, u_int32_t *bitsp) 206 { 207 #ifdef WITH_OPENSSL 208 u_int maxbits, nid; 209 #endif 210 211 if (type == KEY_UNSPEC) 212 fatal("unknown key type %s", key_type_name); 213 if (*bitsp == 0) { 214 #ifdef WITH_OPENSSL 215 if (type == KEY_DSA) 216 *bitsp = DEFAULT_BITS_DSA; 217 else if (type == KEY_ECDSA) { 218 if (name != NULL && 219 (nid = sshkey_ecdsa_nid_from_name(name)) > 0) 220 *bitsp = sshkey_curve_nid_to_bits(nid); 221 if (*bitsp == 0) 222 *bitsp = DEFAULT_BITS_ECDSA; 223 } else 224 #endif 225 *bitsp = DEFAULT_BITS; 226 } 227 #ifdef WITH_OPENSSL 228 maxbits = (type == KEY_DSA) ? 229 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 230 if (*bitsp > maxbits) 231 fatal("key bits exceeds maximum %d", maxbits); 232 switch (type) { 233 case KEY_DSA: 234 if (*bitsp != 1024) 235 fatal("Invalid DSA key length: must be 1024 bits"); 236 break; 237 case KEY_RSA: 238 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE) 239 fatal("Invalid RSA key length: minimum is %d bits", 240 SSH_RSA_MINIMUM_MODULUS_SIZE); 241 break; 242 case KEY_ECDSA: 243 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1) 244 fatal("Invalid ECDSA key length: valid lengths are " 245 "256, 384 or 521 bits"); 246 } 247 #endif 248 } 249 250 static void 251 ask_filename(struct passwd *pw, const char *prompt) 252 { 253 char buf[1024]; 254 char *name = NULL; 255 256 if (key_type_name == NULL) 257 name = _PATH_SSH_CLIENT_ID_RSA; 258 else { 259 switch (sshkey_type_from_name(key_type_name)) { 260 case KEY_DSA_CERT: 261 case KEY_DSA: 262 name = _PATH_SSH_CLIENT_ID_DSA; 263 break; 264 #ifdef OPENSSL_HAS_ECC 265 case KEY_ECDSA_CERT: 266 case KEY_ECDSA: 267 name = _PATH_SSH_CLIENT_ID_ECDSA; 268 break; 269 #endif 270 case KEY_RSA_CERT: 271 case KEY_RSA: 272 name = _PATH_SSH_CLIENT_ID_RSA; 273 break; 274 case KEY_ED25519: 275 case KEY_ED25519_CERT: 276 name = _PATH_SSH_CLIENT_ID_ED25519; 277 break; 278 default: 279 fatal("bad key type"); 280 } 281 } 282 snprintf(identity_file, sizeof(identity_file), 283 "%s/%s", pw->pw_dir, name); 284 printf("%s (%s): ", prompt, identity_file); 285 fflush(stdout); 286 if (fgets(buf, sizeof(buf), stdin) == NULL) 287 exit(1); 288 buf[strcspn(buf, "\n")] = '\0'; 289 if (strcmp(buf, "") != 0) 290 strlcpy(identity_file, buf, sizeof(identity_file)); 291 have_identity = 1; 292 } 293 294 static struct sshkey * 295 load_identity(char *filename) 296 { 297 char *pass; 298 struct sshkey *prv; 299 int r; 300 301 if ((r = sshkey_load_private(filename, "", &prv, NULL)) == 0) 302 return prv; 303 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 304 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 305 if (identity_passphrase) 306 pass = xstrdup(identity_passphrase); 307 else 308 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN); 309 r = sshkey_load_private(filename, pass, &prv, NULL); 310 explicit_bzero(pass, strlen(pass)); 311 free(pass); 312 if (r != 0) 313 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 314 return prv; 315 } 316 317 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 318 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 319 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 320 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 321 322 #ifdef WITH_OPENSSL 323 static void 324 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k) 325 { 326 size_t len; 327 u_char *blob; 328 char comment[61]; 329 int r; 330 331 if ((r = sshkey_to_blob(k, &blob, &len)) != 0) 332 fatal("key_to_blob failed: %s", ssh_err(r)); 333 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 334 snprintf(comment, sizeof(comment), 335 "%u-bit %s, converted by %s@%s from OpenSSH", 336 sshkey_size(k), sshkey_type(k), 337 pw->pw_name, hostname); 338 339 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 340 fprintf(stdout, "Comment: \"%s\"\n", comment); 341 dump_base64(stdout, blob, len); 342 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 343 sshkey_free(k); 344 free(blob); 345 exit(0); 346 } 347 348 static void 349 do_convert_to_pkcs8(struct sshkey *k) 350 { 351 switch (sshkey_type_plain(k->type)) { 352 case KEY_RSA: 353 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 354 fatal("PEM_write_RSA_PUBKEY failed"); 355 break; 356 case KEY_DSA: 357 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 358 fatal("PEM_write_DSA_PUBKEY failed"); 359 break; 360 #ifdef OPENSSL_HAS_ECC 361 case KEY_ECDSA: 362 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 363 fatal("PEM_write_EC_PUBKEY failed"); 364 break; 365 #endif 366 default: 367 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 368 } 369 exit(0); 370 } 371 372 static void 373 do_convert_to_pem(struct sshkey *k) 374 { 375 switch (sshkey_type_plain(k->type)) { 376 case KEY_RSA: 377 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 378 fatal("PEM_write_RSAPublicKey failed"); 379 break; 380 #if notyet /* OpenSSH 0.9.8 lacks this function */ 381 case KEY_DSA: 382 if (!PEM_write_DSAPublicKey(stdout, k->dsa)) 383 fatal("PEM_write_DSAPublicKey failed"); 384 break; 385 #endif 386 /* XXX ECDSA? */ 387 default: 388 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 389 } 390 exit(0); 391 } 392 393 static void 394 do_convert_to(struct passwd *pw) 395 { 396 struct sshkey *k; 397 struct stat st; 398 int r; 399 400 if (!have_identity) 401 ask_filename(pw, "Enter file in which the key is"); 402 if (stat(identity_file, &st) < 0) 403 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 404 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0) 405 k = load_identity(identity_file); 406 switch (convert_format) { 407 case FMT_RFC4716: 408 do_convert_to_ssh2(pw, k); 409 break; 410 case FMT_PKCS8: 411 do_convert_to_pkcs8(k); 412 break; 413 case FMT_PEM: 414 do_convert_to_pem(k); 415 break; 416 default: 417 fatal("%s: unknown key format %d", __func__, convert_format); 418 } 419 exit(0); 420 } 421 422 /* 423 * This is almost exactly the bignum1 encoding, but with 32 bit for length 424 * instead of 16. 425 */ 426 static void 427 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value) 428 { 429 u_int bytes, bignum_bits; 430 int r; 431 432 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0) 433 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 434 bytes = (bignum_bits + 7) / 8; 435 if (sshbuf_len(b) < bytes) 436 fatal("%s: input buffer too small: need %d have %zu", 437 __func__, bytes, sshbuf_len(b)); 438 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL) 439 fatal("%s: BN_bin2bn failed", __func__); 440 if ((r = sshbuf_consume(b, bytes)) != 0) 441 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 442 } 443 444 static struct sshkey * 445 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 446 { 447 struct sshbuf *b; 448 struct sshkey *key = NULL; 449 char *type, *cipher; 450 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345"; 451 int r, rlen, ktype; 452 u_int magic, i1, i2, i3, i4; 453 size_t slen; 454 u_long e; 455 456 if ((b = sshbuf_from(blob, blen)) == NULL) 457 fatal("%s: sshbuf_from failed", __func__); 458 if ((r = sshbuf_get_u32(b, &magic)) != 0) 459 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 460 461 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 462 error("bad magic 0x%x != 0x%x", magic, 463 SSH_COM_PRIVATE_KEY_MAGIC); 464 sshbuf_free(b); 465 return NULL; 466 } 467 if ((r = sshbuf_get_u32(b, &i1)) != 0 || 468 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 469 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 || 470 (r = sshbuf_get_u32(b, &i2)) != 0 || 471 (r = sshbuf_get_u32(b, &i3)) != 0 || 472 (r = sshbuf_get_u32(b, &i4)) != 0) 473 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 474 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 475 if (strcmp(cipher, "none") != 0) { 476 error("unsupported cipher %s", cipher); 477 free(cipher); 478 sshbuf_free(b); 479 free(type); 480 return NULL; 481 } 482 free(cipher); 483 484 if (strstr(type, "dsa")) { 485 ktype = KEY_DSA; 486 } else if (strstr(type, "rsa")) { 487 ktype = KEY_RSA; 488 } else { 489 sshbuf_free(b); 490 free(type); 491 return NULL; 492 } 493 if ((key = sshkey_new_private(ktype)) == NULL) 494 fatal("sshkey_new_private failed"); 495 free(type); 496 497 switch (key->type) { 498 case KEY_DSA: 499 buffer_get_bignum_bits(b, key->dsa->p); 500 buffer_get_bignum_bits(b, key->dsa->g); 501 buffer_get_bignum_bits(b, key->dsa->q); 502 buffer_get_bignum_bits(b, key->dsa->pub_key); 503 buffer_get_bignum_bits(b, key->dsa->priv_key); 504 break; 505 case KEY_RSA: 506 if ((r = sshbuf_get_u8(b, &e1)) != 0 || 507 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) || 508 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0)) 509 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 510 e = e1; 511 debug("e %lx", e); 512 if (e < 30) { 513 e <<= 8; 514 e += e2; 515 debug("e %lx", e); 516 e <<= 8; 517 e += e3; 518 debug("e %lx", e); 519 } 520 if (!BN_set_word(key->rsa->e, e)) { 521 sshbuf_free(b); 522 sshkey_free(key); 523 return NULL; 524 } 525 buffer_get_bignum_bits(b, key->rsa->d); 526 buffer_get_bignum_bits(b, key->rsa->n); 527 buffer_get_bignum_bits(b, key->rsa->iqmp); 528 buffer_get_bignum_bits(b, key->rsa->q); 529 buffer_get_bignum_bits(b, key->rsa->p); 530 if ((r = ssh_rsa_generate_additional_parameters(key)) != 0) 531 fatal("generate RSA parameters failed: %s", ssh_err(r)); 532 break; 533 } 534 rlen = sshbuf_len(b); 535 if (rlen != 0) 536 error("do_convert_private_ssh2_from_blob: " 537 "remaining bytes in key blob %d", rlen); 538 sshbuf_free(b); 539 540 /* try the key */ 541 if (sshkey_sign(key, &sig, &slen, data, sizeof(data), NULL, 0) != 0 || 542 sshkey_verify(key, sig, slen, data, sizeof(data), 0) != 0) { 543 sshkey_free(key); 544 free(sig); 545 return NULL; 546 } 547 free(sig); 548 return key; 549 } 550 551 static int 552 get_line(FILE *fp, char *line, size_t len) 553 { 554 int c; 555 size_t pos = 0; 556 557 line[0] = '\0'; 558 while ((c = fgetc(fp)) != EOF) { 559 if (pos >= len - 1) 560 fatal("input line too long."); 561 switch (c) { 562 case '\r': 563 c = fgetc(fp); 564 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) 565 fatal("unget: %s", strerror(errno)); 566 return pos; 567 case '\n': 568 return pos; 569 } 570 line[pos++] = c; 571 line[pos] = '\0'; 572 } 573 /* We reached EOF */ 574 return -1; 575 } 576 577 static void 578 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private) 579 { 580 int r, blen, escaped = 0; 581 u_int len; 582 char line[1024]; 583 u_char blob[8096]; 584 char encoded[8096]; 585 FILE *fp; 586 587 if ((fp = fopen(identity_file, "r")) == NULL) 588 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 589 encoded[0] = '\0'; 590 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 591 if (blen > 0 && line[blen - 1] == '\\') 592 escaped++; 593 if (strncmp(line, "----", 4) == 0 || 594 strstr(line, ": ") != NULL) { 595 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 596 *private = 1; 597 if (strstr(line, " END ") != NULL) { 598 break; 599 } 600 /* fprintf(stderr, "ignore: %s", line); */ 601 continue; 602 } 603 if (escaped) { 604 escaped--; 605 /* fprintf(stderr, "escaped: %s", line); */ 606 continue; 607 } 608 strlcat(encoded, line, sizeof(encoded)); 609 } 610 len = strlen(encoded); 611 if (((len % 4) == 3) && 612 (encoded[len-1] == '=') && 613 (encoded[len-2] == '=') && 614 (encoded[len-3] == '=')) 615 encoded[len-3] = '\0'; 616 blen = uudecode(encoded, blob, sizeof(blob)); 617 if (blen < 0) 618 fatal("uudecode failed."); 619 if (*private) 620 *k = do_convert_private_ssh2_from_blob(blob, blen); 621 else if ((r = sshkey_from_blob(blob, blen, k)) != 0) 622 fatal("decode blob failed: %s", ssh_err(r)); 623 fclose(fp); 624 } 625 626 static void 627 do_convert_from_pkcs8(struct sshkey **k, int *private) 628 { 629 EVP_PKEY *pubkey; 630 FILE *fp; 631 632 if ((fp = fopen(identity_file, "r")) == NULL) 633 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 634 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 635 fatal("%s: %s is not a recognised public key format", __func__, 636 identity_file); 637 } 638 fclose(fp); 639 switch (EVP_PKEY_type(pubkey->type)) { 640 case EVP_PKEY_RSA: 641 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 642 fatal("sshkey_new failed"); 643 (*k)->type = KEY_RSA; 644 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 645 break; 646 case EVP_PKEY_DSA: 647 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 648 fatal("sshkey_new failed"); 649 (*k)->type = KEY_DSA; 650 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 651 break; 652 #ifdef OPENSSL_HAS_ECC 653 case EVP_PKEY_EC: 654 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 655 fatal("sshkey_new failed"); 656 (*k)->type = KEY_ECDSA; 657 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 658 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa); 659 break; 660 #endif 661 default: 662 fatal("%s: unsupported pubkey type %d", __func__, 663 EVP_PKEY_type(pubkey->type)); 664 } 665 EVP_PKEY_free(pubkey); 666 return; 667 } 668 669 static void 670 do_convert_from_pem(struct sshkey **k, int *private) 671 { 672 FILE *fp; 673 RSA *rsa; 674 #ifdef notyet 675 DSA *dsa; 676 #endif 677 678 if ((fp = fopen(identity_file, "r")) == NULL) 679 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 680 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 681 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 682 fatal("sshkey_new failed"); 683 (*k)->type = KEY_RSA; 684 (*k)->rsa = rsa; 685 fclose(fp); 686 return; 687 } 688 #if notyet /* OpenSSH 0.9.8 lacks this function */ 689 rewind(fp); 690 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 691 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 692 fatal("sshkey_new failed"); 693 (*k)->type = KEY_DSA; 694 (*k)->dsa = dsa; 695 fclose(fp); 696 return; 697 } 698 /* XXX ECDSA */ 699 #endif 700 fatal("%s: unrecognised raw private key format", __func__); 701 } 702 703 static void 704 do_convert_from(struct passwd *pw) 705 { 706 struct sshkey *k = NULL; 707 int r, private = 0, ok = 0; 708 struct stat st; 709 710 if (!have_identity) 711 ask_filename(pw, "Enter file in which the key is"); 712 if (stat(identity_file, &st) < 0) 713 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 714 715 switch (convert_format) { 716 case FMT_RFC4716: 717 do_convert_from_ssh2(pw, &k, &private); 718 break; 719 case FMT_PKCS8: 720 do_convert_from_pkcs8(&k, &private); 721 break; 722 case FMT_PEM: 723 do_convert_from_pem(&k, &private); 724 break; 725 default: 726 fatal("%s: unknown key format %d", __func__, convert_format); 727 } 728 729 if (!private) { 730 if ((r = sshkey_write(k, stdout)) == 0) 731 ok = 1; 732 if (ok) 733 fprintf(stdout, "\n"); 734 } else { 735 switch (k->type) { 736 case KEY_DSA: 737 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 738 NULL, 0, NULL, NULL); 739 break; 740 #ifdef OPENSSL_HAS_ECC 741 case KEY_ECDSA: 742 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 743 NULL, 0, NULL, NULL); 744 break; 745 #endif 746 case KEY_RSA: 747 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 748 NULL, 0, NULL, NULL); 749 break; 750 default: 751 fatal("%s: unsupported key type %s", __func__, 752 sshkey_type(k)); 753 } 754 } 755 756 if (!ok) 757 fatal("key write failed"); 758 sshkey_free(k); 759 exit(0); 760 } 761 #endif 762 763 static void 764 do_print_public(struct passwd *pw) 765 { 766 struct sshkey *prv; 767 struct stat st; 768 int r; 769 770 if (!have_identity) 771 ask_filename(pw, "Enter file in which the key is"); 772 if (stat(identity_file, &st) < 0) 773 fatal("%s: %s", identity_file, strerror(errno)); 774 prv = load_identity(identity_file); 775 if ((r = sshkey_write(prv, stdout)) != 0) 776 error("sshkey_write failed: %s", ssh_err(r)); 777 sshkey_free(prv); 778 fprintf(stdout, "\n"); 779 exit(0); 780 } 781 782 static void 783 do_download(struct passwd *pw) 784 { 785 #ifdef ENABLE_PKCS11 786 struct sshkey **keys = NULL; 787 int i, nkeys; 788 enum sshkey_fp_rep rep; 789 int fptype; 790 char *fp, *ra; 791 792 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 793 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 794 795 pkcs11_init(0); 796 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 797 if (nkeys <= 0) 798 fatal("cannot read public key from pkcs11"); 799 for (i = 0; i < nkeys; i++) { 800 if (print_fingerprint) { 801 fp = sshkey_fingerprint(keys[i], fptype, rep); 802 ra = sshkey_fingerprint(keys[i], fingerprint_hash, 803 SSH_FP_RANDOMART); 804 if (fp == NULL || ra == NULL) 805 fatal("%s: sshkey_fingerprint fail", __func__); 806 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]), 807 fp, sshkey_type(keys[i])); 808 if (log_level >= SYSLOG_LEVEL_VERBOSE) 809 printf("%s\n", ra); 810 free(ra); 811 free(fp); 812 } else { 813 (void) sshkey_write(keys[i], stdout); /* XXX check */ 814 fprintf(stdout, "\n"); 815 } 816 sshkey_free(keys[i]); 817 } 818 free(keys); 819 pkcs11_terminate(); 820 exit(0); 821 #else 822 fatal("no pkcs11 support"); 823 #endif /* ENABLE_PKCS11 */ 824 } 825 826 static struct sshkey * 827 try_read_key(char **cpp) 828 { 829 struct sshkey *ret; 830 int r; 831 832 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL) 833 fatal("sshkey_new failed"); 834 if ((r = sshkey_read(ret, cpp)) == 0) 835 return ret; 836 /* Not a key */ 837 sshkey_free(ret); 838 return NULL; 839 } 840 841 static void 842 fingerprint_one_key(const struct sshkey *public, const char *comment) 843 { 844 char *fp = NULL, *ra = NULL; 845 enum sshkey_fp_rep rep; 846 int fptype; 847 848 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 849 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 850 fp = sshkey_fingerprint(public, fptype, rep); 851 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART); 852 if (fp == NULL || ra == NULL) 853 fatal("%s: sshkey_fingerprint failed", __func__); 854 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp, 855 comment ? comment : "no comment", sshkey_type(public)); 856 if (log_level >= SYSLOG_LEVEL_VERBOSE) 857 printf("%s\n", ra); 858 free(ra); 859 free(fp); 860 } 861 862 static void 863 fingerprint_private(const char *path) 864 { 865 struct stat st; 866 char *comment = NULL; 867 struct sshkey *public = NULL; 868 int r; 869 870 if (stat(identity_file, &st) < 0) 871 fatal("%s: %s", path, strerror(errno)); 872 if ((r = sshkey_load_public(path, &public, &comment)) != 0) { 873 debug("load public \"%s\": %s", path, ssh_err(r)); 874 if ((r = sshkey_load_private(path, NULL, 875 &public, &comment)) != 0) { 876 debug("load private \"%s\": %s", path, ssh_err(r)); 877 fatal("%s is not a key file.", path); 878 } 879 } 880 881 fingerprint_one_key(public, comment); 882 sshkey_free(public); 883 free(comment); 884 } 885 886 static void 887 do_fingerprint(struct passwd *pw) 888 { 889 FILE *f; 890 struct sshkey *public = NULL; 891 char *comment = NULL, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES]; 892 int i, invalid = 1; 893 const char *path; 894 u_long lnum = 0; 895 896 if (!have_identity) 897 ask_filename(pw, "Enter file in which the key is"); 898 path = identity_file; 899 900 if (strcmp(identity_file, "-") == 0) { 901 f = stdin; 902 path = "(stdin)"; 903 } else if ((f = fopen(path, "r")) == NULL) 904 fatal("%s: %s: %s", __progname, path, strerror(errno)); 905 906 while (read_keyfile_line(f, path, line, sizeof(line), &lnum) == 0) { 907 cp = line; 908 cp[strcspn(cp, "\n")] = '\0'; 909 /* Trim leading space and comments */ 910 cp = line + strspn(line, " \t"); 911 if (*cp == '#' || *cp == '\0') 912 continue; 913 914 /* 915 * Input may be plain keys, private keys, authorized_keys 916 * or known_hosts. 917 */ 918 919 /* 920 * Try private keys first. Assume a key is private if 921 * "SSH PRIVATE KEY" appears on the first line and we're 922 * not reading from stdin (XXX support private keys on stdin). 923 */ 924 if (lnum == 1 && strcmp(identity_file, "-") != 0 && 925 strstr(cp, "PRIVATE KEY") != NULL) { 926 fclose(f); 927 fingerprint_private(path); 928 exit(0); 929 } 930 931 /* 932 * If it's not a private key, then this must be prepared to 933 * accept a public key prefixed with a hostname or options. 934 * Try a bare key first, otherwise skip the leading stuff. 935 */ 936 if ((public = try_read_key(&cp)) == NULL) { 937 i = strtol(cp, &ep, 10); 938 if (i == 0 || ep == NULL || 939 (*ep != ' ' && *ep != '\t')) { 940 int quoted = 0; 941 942 comment = cp; 943 for (; *cp && (quoted || (*cp != ' ' && 944 *cp != '\t')); cp++) { 945 if (*cp == '\\' && cp[1] == '"') 946 cp++; /* Skip both */ 947 else if (*cp == '"') 948 quoted = !quoted; 949 } 950 if (!*cp) 951 continue; 952 *cp++ = '\0'; 953 } 954 } 955 /* Retry after parsing leading hostname/key options */ 956 if (public == NULL && (public = try_read_key(&cp)) == NULL) { 957 debug("%s:%lu: not a public key", path, lnum); 958 continue; 959 } 960 961 /* Find trailing comment, if any */ 962 for (; *cp == ' ' || *cp == '\t'; cp++) 963 ; 964 if (*cp != '\0' && *cp != '#') 965 comment = cp; 966 967 fingerprint_one_key(public, comment); 968 sshkey_free(public); 969 invalid = 0; /* One good key in the file is sufficient */ 970 } 971 fclose(f); 972 973 if (invalid) 974 fatal("%s is not a public key file.", path); 975 exit(0); 976 } 977 978 static void 979 do_gen_all_hostkeys(struct passwd *pw) 980 { 981 struct { 982 char *key_type; 983 char *key_type_display; 984 char *path; 985 } key_types[] = { 986 #ifdef WITH_OPENSSL 987 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 988 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 989 #ifdef OPENSSL_HAS_ECC 990 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 991 #endif /* OPENSSL_HAS_ECC */ 992 #endif /* WITH_OPENSSL */ 993 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE }, 994 { NULL, NULL, NULL } 995 }; 996 997 int first = 0; 998 struct stat st; 999 struct sshkey *private, *public; 1000 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file; 1001 int i, type, fd, r; 1002 FILE *f; 1003 1004 for (i = 0; key_types[i].key_type; i++) { 1005 public = private = NULL; 1006 prv_tmp = pub_tmp = prv_file = pub_file = NULL; 1007 1008 xasprintf(&prv_file, "%s%s", 1009 identity_file, key_types[i].path); 1010 1011 /* Check whether private key exists and is not zero-length */ 1012 if (stat(prv_file, &st) == 0) { 1013 if (st.st_size != 0) 1014 goto next; 1015 } else if (errno != ENOENT) { 1016 error("Could not stat %s: %s", key_types[i].path, 1017 strerror(errno)); 1018 goto failnext; 1019 } 1020 1021 /* 1022 * Private key doesn't exist or is invalid; proceed with 1023 * key generation. 1024 */ 1025 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX", 1026 identity_file, key_types[i].path); 1027 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX", 1028 identity_file, key_types[i].path); 1029 xasprintf(&pub_file, "%s%s.pub", 1030 identity_file, key_types[i].path); 1031 1032 if (first == 0) { 1033 first = 1; 1034 printf("%s: generating new host keys: ", __progname); 1035 } 1036 printf("%s ", key_types[i].key_type_display); 1037 fflush(stdout); 1038 type = sshkey_type_from_name(key_types[i].key_type); 1039 if ((fd = mkstemp(prv_tmp)) == -1) { 1040 error("Could not save your public key in %s: %s", 1041 prv_tmp, strerror(errno)); 1042 goto failnext; 1043 } 1044 close(fd); /* just using mkstemp() to generate/reserve a name */ 1045 bits = 0; 1046 type_bits_valid(type, NULL, &bits); 1047 if ((r = sshkey_generate(type, bits, &private)) != 0) { 1048 error("sshkey_generate failed: %s", ssh_err(r)); 1049 goto failnext; 1050 } 1051 if ((r = sshkey_from_private(private, &public)) != 0) 1052 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1053 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 1054 hostname); 1055 if ((r = sshkey_save_private(private, prv_tmp, "", 1056 comment, use_new_format, new_format_cipher, rounds)) != 0) { 1057 error("Saving key \"%s\" failed: %s", 1058 prv_tmp, ssh_err(r)); 1059 goto failnext; 1060 } 1061 if ((fd = mkstemp(pub_tmp)) == -1) { 1062 error("Could not save your public key in %s: %s", 1063 pub_tmp, strerror(errno)); 1064 goto failnext; 1065 } 1066 (void)fchmod(fd, 0644); 1067 f = fdopen(fd, "w"); 1068 if (f == NULL) { 1069 error("fdopen %s failed: %s", pub_tmp, strerror(errno)); 1070 close(fd); 1071 goto failnext; 1072 } 1073 if ((r = sshkey_write(public, f)) != 0) { 1074 error("write key failed: %s", ssh_err(r)); 1075 fclose(f); 1076 goto failnext; 1077 } 1078 fprintf(f, " %s\n", comment); 1079 if (ferror(f) != 0) { 1080 error("write key failed: %s", strerror(errno)); 1081 fclose(f); 1082 goto failnext; 1083 } 1084 if (fclose(f) != 0) { 1085 error("key close failed: %s", strerror(errno)); 1086 goto failnext; 1087 } 1088 1089 /* Rename temporary files to their permanent locations. */ 1090 if (rename(pub_tmp, pub_file) != 0) { 1091 error("Unable to move %s into position: %s", 1092 pub_file, strerror(errno)); 1093 goto failnext; 1094 } 1095 if (rename(prv_tmp, prv_file) != 0) { 1096 error("Unable to move %s into position: %s", 1097 key_types[i].path, strerror(errno)); 1098 failnext: 1099 first = 0; 1100 goto next; 1101 } 1102 next: 1103 sshkey_free(private); 1104 sshkey_free(public); 1105 free(prv_tmp); 1106 free(pub_tmp); 1107 free(prv_file); 1108 free(pub_file); 1109 } 1110 if (first != 0) 1111 printf("\n"); 1112 } 1113 1114 struct known_hosts_ctx { 1115 const char *host; /* Hostname searched for in find/delete case */ 1116 FILE *out; /* Output file, stdout for find_hosts case */ 1117 int has_unhashed; /* When hashing, original had unhashed hosts */ 1118 int found_key; /* For find/delete, host was found */ 1119 int invalid; /* File contained invalid items; don't delete */ 1120 }; 1121 1122 static int 1123 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx) 1124 { 1125 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1126 char *hashed, *cp, *hosts, *ohosts; 1127 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts); 1128 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM; 1129 1130 switch (l->status) { 1131 case HKF_STATUS_OK: 1132 case HKF_STATUS_MATCHED: 1133 /* 1134 * Don't hash hosts already already hashed, with wildcard 1135 * characters or a CA/revocation marker. 1136 */ 1137 if (was_hashed || has_wild || l->marker != MRK_NONE) { 1138 fprintf(ctx->out, "%s\n", l->line); 1139 if (has_wild && !find_host) { 1140 logit("%s:%lu: ignoring host name " 1141 "with wildcard: %.64s", l->path, 1142 l->linenum, l->hosts); 1143 } 1144 return 0; 1145 } 1146 /* 1147 * Split any comma-separated hostnames from the host list, 1148 * hash and store separately. 1149 */ 1150 ohosts = hosts = xstrdup(l->hosts); 1151 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') { 1152 lowercase(cp); 1153 if ((hashed = host_hash(cp, NULL, 0)) == NULL) 1154 fatal("hash_host failed"); 1155 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey); 1156 ctx->has_unhashed = 1; 1157 } 1158 free(ohosts); 1159 return 0; 1160 case HKF_STATUS_INVALID: 1161 /* Retain invalid lines, but mark file as invalid. */ 1162 ctx->invalid = 1; 1163 logit("%s:%lu: invalid line", l->path, l->linenum); 1164 /* FALLTHROUGH */ 1165 default: 1166 fprintf(ctx->out, "%s\n", l->line); 1167 return 0; 1168 } 1169 /* NOTREACHED */ 1170 return -1; 1171 } 1172 1173 static int 1174 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx) 1175 { 1176 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1177 enum sshkey_fp_rep rep; 1178 int fptype; 1179 char *fp; 1180 1181 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 1182 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 1183 1184 if (l->status == HKF_STATUS_MATCHED) { 1185 if (delete_host) { 1186 if (l->marker != MRK_NONE) { 1187 /* Don't remove CA and revocation lines */ 1188 fprintf(ctx->out, "%s\n", l->line); 1189 } else { 1190 /* 1191 * Hostname matches and has no CA/revoke 1192 * marker, delete it by *not* writing the 1193 * line to ctx->out. 1194 */ 1195 ctx->found_key = 1; 1196 if (!quiet) 1197 printf("# Host %s found: line %lu\n", 1198 ctx->host, l->linenum); 1199 } 1200 return 0; 1201 } else if (find_host) { 1202 ctx->found_key = 1; 1203 if (!quiet) { 1204 printf("# Host %s found: line %lu %s\n", 1205 ctx->host, 1206 l->linenum, l->marker == MRK_CA ? "CA" : 1207 (l->marker == MRK_REVOKE ? "REVOKED" : "")); 1208 } 1209 if (hash_hosts) 1210 known_hosts_hash(l, ctx); 1211 else if (print_fingerprint) { 1212 fp = sshkey_fingerprint(l->key, fptype, rep); 1213 mprintf("%s %s %s %s\n", ctx->host, 1214 sshkey_type(l->key), fp, l->comment); 1215 free(fp); 1216 } else 1217 fprintf(ctx->out, "%s\n", l->line); 1218 return 0; 1219 } 1220 } else if (delete_host) { 1221 /* Retain non-matching hosts when deleting */ 1222 if (l->status == HKF_STATUS_INVALID) { 1223 ctx->invalid = 1; 1224 logit("%s:%lu: invalid line", l->path, l->linenum); 1225 } 1226 fprintf(ctx->out, "%s\n", l->line); 1227 } 1228 return 0; 1229 } 1230 1231 static void 1232 do_known_hosts(struct passwd *pw, const char *name) 1233 { 1234 char *cp, tmp[PATH_MAX], old[PATH_MAX]; 1235 int r, fd, oerrno, inplace = 0; 1236 struct known_hosts_ctx ctx; 1237 u_int foreach_options; 1238 1239 if (!have_identity) { 1240 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1241 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1242 sizeof(identity_file)) 1243 fatal("Specified known hosts path too long"); 1244 free(cp); 1245 have_identity = 1; 1246 } 1247 1248 memset(&ctx, 0, sizeof(ctx)); 1249 ctx.out = stdout; 1250 ctx.host = name; 1251 1252 /* 1253 * Find hosts goes to stdout, hash and deletions happen in-place 1254 * A corner case is ssh-keygen -HF foo, which should go to stdout 1255 */ 1256 if (!find_host && (hash_hosts || delete_host)) { 1257 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1258 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1259 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1260 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1261 fatal("known_hosts path too long"); 1262 umask(077); 1263 if ((fd = mkstemp(tmp)) == -1) 1264 fatal("mkstemp: %s", strerror(errno)); 1265 if ((ctx.out = fdopen(fd, "w")) == NULL) { 1266 oerrno = errno; 1267 unlink(tmp); 1268 fatal("fdopen: %s", strerror(oerrno)); 1269 } 1270 inplace = 1; 1271 } 1272 1273 /* XXX support identity_file == "-" for stdin */ 1274 foreach_options = find_host ? HKF_WANT_MATCH : 0; 1275 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0; 1276 if ((r = hostkeys_foreach(identity_file, 1277 hash_hosts ? known_hosts_hash : known_hosts_find_delete, &ctx, 1278 name, NULL, foreach_options)) != 0) { 1279 if (inplace) 1280 unlink(tmp); 1281 fatal("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r)); 1282 } 1283 1284 if (inplace) 1285 fclose(ctx.out); 1286 1287 if (ctx.invalid) { 1288 error("%s is not a valid known_hosts file.", identity_file); 1289 if (inplace) { 1290 error("Not replacing existing known_hosts " 1291 "file because of errors"); 1292 unlink(tmp); 1293 } 1294 exit(1); 1295 } else if (delete_host && !ctx.found_key) { 1296 logit("Host %s not found in %s", name, identity_file); 1297 if (inplace) 1298 unlink(tmp); 1299 } else if (inplace) { 1300 /* Backup existing file */ 1301 if (unlink(old) == -1 && errno != ENOENT) 1302 fatal("unlink %.100s: %s", old, strerror(errno)); 1303 if (link(identity_file, old) == -1) 1304 fatal("link %.100s to %.100s: %s", identity_file, old, 1305 strerror(errno)); 1306 /* Move new one into place */ 1307 if (rename(tmp, identity_file) == -1) { 1308 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1309 strerror(errno)); 1310 unlink(tmp); 1311 unlink(old); 1312 exit(1); 1313 } 1314 1315 printf("%s updated.\n", identity_file); 1316 printf("Original contents retained as %s\n", old); 1317 if (ctx.has_unhashed) { 1318 logit("WARNING: %s contains unhashed entries", old); 1319 logit("Delete this file to ensure privacy " 1320 "of hostnames"); 1321 } 1322 } 1323 1324 exit (find_host && !ctx.found_key); 1325 } 1326 1327 /* 1328 * Perform changing a passphrase. The argument is the passwd structure 1329 * for the current user. 1330 */ 1331 static void 1332 do_change_passphrase(struct passwd *pw) 1333 { 1334 char *comment; 1335 char *old_passphrase, *passphrase1, *passphrase2; 1336 struct stat st; 1337 struct sshkey *private; 1338 int r; 1339 1340 if (!have_identity) 1341 ask_filename(pw, "Enter file in which the key is"); 1342 if (stat(identity_file, &st) < 0) 1343 fatal("%s: %s", identity_file, strerror(errno)); 1344 /* Try to load the file with empty passphrase. */ 1345 r = sshkey_load_private(identity_file, "", &private, &comment); 1346 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) { 1347 if (identity_passphrase) 1348 old_passphrase = xstrdup(identity_passphrase); 1349 else 1350 old_passphrase = 1351 read_passphrase("Enter old passphrase: ", 1352 RP_ALLOW_STDIN); 1353 r = sshkey_load_private(identity_file, old_passphrase, 1354 &private, &comment); 1355 explicit_bzero(old_passphrase, strlen(old_passphrase)); 1356 free(old_passphrase); 1357 if (r != 0) 1358 goto badkey; 1359 } else if (r != 0) { 1360 badkey: 1361 fatal("Failed to load key %s: %s", identity_file, ssh_err(r)); 1362 } 1363 if (comment) 1364 mprintf("Key has comment '%s'\n", comment); 1365 1366 /* Ask the new passphrase (twice). */ 1367 if (identity_new_passphrase) { 1368 passphrase1 = xstrdup(identity_new_passphrase); 1369 passphrase2 = NULL; 1370 } else { 1371 passphrase1 = 1372 read_passphrase("Enter new passphrase (empty for no " 1373 "passphrase): ", RP_ALLOW_STDIN); 1374 passphrase2 = read_passphrase("Enter same passphrase again: ", 1375 RP_ALLOW_STDIN); 1376 1377 /* Verify that they are the same. */ 1378 if (strcmp(passphrase1, passphrase2) != 0) { 1379 explicit_bzero(passphrase1, strlen(passphrase1)); 1380 explicit_bzero(passphrase2, strlen(passphrase2)); 1381 free(passphrase1); 1382 free(passphrase2); 1383 printf("Pass phrases do not match. Try again.\n"); 1384 exit(1); 1385 } 1386 /* Destroy the other copy. */ 1387 explicit_bzero(passphrase2, strlen(passphrase2)); 1388 free(passphrase2); 1389 } 1390 1391 /* Save the file using the new passphrase. */ 1392 if ((r = sshkey_save_private(private, identity_file, passphrase1, 1393 comment, use_new_format, new_format_cipher, rounds)) != 0) { 1394 error("Saving key \"%s\" failed: %s.", 1395 identity_file, ssh_err(r)); 1396 explicit_bzero(passphrase1, strlen(passphrase1)); 1397 free(passphrase1); 1398 sshkey_free(private); 1399 free(comment); 1400 exit(1); 1401 } 1402 /* Destroy the passphrase and the copy of the key in memory. */ 1403 explicit_bzero(passphrase1, strlen(passphrase1)); 1404 free(passphrase1); 1405 sshkey_free(private); /* Destroys contents */ 1406 free(comment); 1407 1408 printf("Your identification has been saved with the new passphrase.\n"); 1409 exit(0); 1410 } 1411 1412 /* 1413 * Print the SSHFP RR. 1414 */ 1415 static int 1416 do_print_resource_record(struct passwd *pw, char *fname, char *hname) 1417 { 1418 struct sshkey *public; 1419 char *comment = NULL; 1420 struct stat st; 1421 int r; 1422 1423 if (fname == NULL) 1424 fatal("%s: no filename", __func__); 1425 if (stat(fname, &st) < 0) { 1426 if (errno == ENOENT) 1427 return 0; 1428 fatal("%s: %s", fname, strerror(errno)); 1429 } 1430 if ((r = sshkey_load_public(fname, &public, &comment)) != 0) 1431 fatal("Failed to read v2 public key from \"%s\": %s.", 1432 fname, ssh_err(r)); 1433 export_dns_rr(hname, public, stdout, print_generic); 1434 sshkey_free(public); 1435 free(comment); 1436 return 1; 1437 } 1438 1439 /* 1440 * Change the comment of a private key file. 1441 */ 1442 static void 1443 do_change_comment(struct passwd *pw) 1444 { 1445 char new_comment[1024], *comment, *passphrase; 1446 struct sshkey *private; 1447 struct sshkey *public; 1448 struct stat st; 1449 FILE *f; 1450 int r, fd; 1451 1452 if (!have_identity) 1453 ask_filename(pw, "Enter file in which the key is"); 1454 if (stat(identity_file, &st) < 0) 1455 fatal("%s: %s", identity_file, strerror(errno)); 1456 if ((r = sshkey_load_private(identity_file, "", 1457 &private, &comment)) == 0) 1458 passphrase = xstrdup(""); 1459 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 1460 fatal("Cannot load private key \"%s\": %s.", 1461 identity_file, ssh_err(r)); 1462 else { 1463 if (identity_passphrase) 1464 passphrase = xstrdup(identity_passphrase); 1465 else if (identity_new_passphrase) 1466 passphrase = xstrdup(identity_new_passphrase); 1467 else 1468 passphrase = read_passphrase("Enter passphrase: ", 1469 RP_ALLOW_STDIN); 1470 /* Try to load using the passphrase. */ 1471 if ((r = sshkey_load_private(identity_file, passphrase, 1472 &private, &comment)) != 0) { 1473 explicit_bzero(passphrase, strlen(passphrase)); 1474 free(passphrase); 1475 fatal("Cannot load private key \"%s\": %s.", 1476 identity_file, ssh_err(r)); 1477 } 1478 } 1479 1480 if (private->type != KEY_ED25519 && !use_new_format) { 1481 error("Comments are only supported for keys stored in " 1482 "the new format (-o)."); 1483 explicit_bzero(passphrase, strlen(passphrase)); 1484 sshkey_free(private); 1485 exit(1); 1486 } 1487 if (comment) 1488 printf("Key now has comment '%s'\n", comment); 1489 else 1490 printf("Key now has no comment\n"); 1491 1492 if (identity_comment) { 1493 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1494 } else { 1495 printf("Enter new comment: "); 1496 fflush(stdout); 1497 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1498 explicit_bzero(passphrase, strlen(passphrase)); 1499 sshkey_free(private); 1500 exit(1); 1501 } 1502 new_comment[strcspn(new_comment, "\n")] = '\0'; 1503 } 1504 1505 /* Save the file using the new passphrase. */ 1506 if ((r = sshkey_save_private(private, identity_file, passphrase, 1507 new_comment, use_new_format, new_format_cipher, rounds)) != 0) { 1508 error("Saving key \"%s\" failed: %s", 1509 identity_file, ssh_err(r)); 1510 explicit_bzero(passphrase, strlen(passphrase)); 1511 free(passphrase); 1512 sshkey_free(private); 1513 free(comment); 1514 exit(1); 1515 } 1516 explicit_bzero(passphrase, strlen(passphrase)); 1517 free(passphrase); 1518 if ((r = sshkey_from_private(private, &public)) != 0) 1519 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1520 sshkey_free(private); 1521 1522 strlcat(identity_file, ".pub", sizeof(identity_file)); 1523 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1524 if (fd == -1) 1525 fatal("Could not save your public key in %s", identity_file); 1526 f = fdopen(fd, "w"); 1527 if (f == NULL) 1528 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 1529 if ((r = sshkey_write(public, f)) != 0) 1530 fatal("write key failed: %s", ssh_err(r)); 1531 sshkey_free(public); 1532 fprintf(f, " %s\n", new_comment); 1533 fclose(f); 1534 1535 free(comment); 1536 1537 printf("The comment in your key file has been changed.\n"); 1538 exit(0); 1539 } 1540 1541 static void 1542 add_flag_option(struct sshbuf *c, const char *name) 1543 { 1544 int r; 1545 1546 debug3("%s: %s", __func__, name); 1547 if ((r = sshbuf_put_cstring(c, name)) != 0 || 1548 (r = sshbuf_put_string(c, NULL, 0)) != 0) 1549 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1550 } 1551 1552 static void 1553 add_string_option(struct sshbuf *c, const char *name, const char *value) 1554 { 1555 struct sshbuf *b; 1556 int r; 1557 1558 debug3("%s: %s=%s", __func__, name, value); 1559 if ((b = sshbuf_new()) == NULL) 1560 fatal("%s: sshbuf_new failed", __func__); 1561 if ((r = sshbuf_put_cstring(b, value)) != 0 || 1562 (r = sshbuf_put_cstring(c, name)) != 0 || 1563 (r = sshbuf_put_stringb(c, b)) != 0) 1564 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1565 1566 sshbuf_free(b); 1567 } 1568 1569 #define OPTIONS_CRITICAL 1 1570 #define OPTIONS_EXTENSIONS 2 1571 static void 1572 prepare_options_buf(struct sshbuf *c, int which) 1573 { 1574 size_t i; 1575 1576 sshbuf_reset(c); 1577 if ((which & OPTIONS_CRITICAL) != 0 && 1578 certflags_command != NULL) 1579 add_string_option(c, "force-command", certflags_command); 1580 if ((which & OPTIONS_EXTENSIONS) != 0 && 1581 (certflags_flags & CERTOPT_X_FWD) != 0) 1582 add_flag_option(c, "permit-X11-forwarding"); 1583 if ((which & OPTIONS_EXTENSIONS) != 0 && 1584 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1585 add_flag_option(c, "permit-agent-forwarding"); 1586 if ((which & OPTIONS_EXTENSIONS) != 0 && 1587 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1588 add_flag_option(c, "permit-port-forwarding"); 1589 if ((which & OPTIONS_EXTENSIONS) != 0 && 1590 (certflags_flags & CERTOPT_PTY) != 0) 1591 add_flag_option(c, "permit-pty"); 1592 if ((which & OPTIONS_EXTENSIONS) != 0 && 1593 (certflags_flags & CERTOPT_USER_RC) != 0) 1594 add_flag_option(c, "permit-user-rc"); 1595 if ((which & OPTIONS_CRITICAL) != 0 && 1596 certflags_src_addr != NULL) 1597 add_string_option(c, "source-address", certflags_src_addr); 1598 for (i = 0; i < ncert_userext; i++) { 1599 if ((cert_userext[i].crit && (which & OPTIONS_EXTENSIONS)) || 1600 (!cert_userext[i].crit && (which & OPTIONS_CRITICAL))) 1601 continue; 1602 if (cert_userext[i].val == NULL) 1603 add_flag_option(c, cert_userext[i].key); 1604 else { 1605 add_string_option(c, cert_userext[i].key, 1606 cert_userext[i].val); 1607 } 1608 } 1609 } 1610 1611 static struct sshkey * 1612 load_pkcs11_key(char *path) 1613 { 1614 #ifdef ENABLE_PKCS11 1615 struct sshkey **keys = NULL, *public, *private = NULL; 1616 int r, i, nkeys; 1617 1618 if ((r = sshkey_load_public(path, &public, NULL)) != 0) 1619 fatal("Couldn't load CA public key \"%s\": %s", 1620 path, ssh_err(r)); 1621 1622 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1623 debug3("%s: %d keys", __func__, nkeys); 1624 if (nkeys <= 0) 1625 fatal("cannot read public key from pkcs11"); 1626 for (i = 0; i < nkeys; i++) { 1627 if (sshkey_equal_public(public, keys[i])) { 1628 private = keys[i]; 1629 continue; 1630 } 1631 sshkey_free(keys[i]); 1632 } 1633 free(keys); 1634 sshkey_free(public); 1635 return private; 1636 #else 1637 fatal("no pkcs11 support"); 1638 #endif /* ENABLE_PKCS11 */ 1639 } 1640 1641 /* Signer for sshkey_certify_custom that uses the agent */ 1642 static int 1643 agent_signer(const struct sshkey *key, u_char **sigp, size_t *lenp, 1644 const u_char *data, size_t datalen, 1645 const char *alg, u_int compat, void *ctx) 1646 { 1647 int *agent_fdp = (int *)ctx; 1648 1649 return ssh_agent_sign(*agent_fdp, key, sigp, lenp, 1650 data, datalen, alg, compat); 1651 } 1652 1653 static void 1654 do_ca_sign(struct passwd *pw, int argc, char **argv) 1655 { 1656 int r, i, fd, found, agent_fd = -1; 1657 u_int n; 1658 struct sshkey *ca, *public; 1659 char valid[64], *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1660 FILE *f; 1661 struct ssh_identitylist *agent_ids; 1662 size_t j; 1663 1664 #ifdef ENABLE_PKCS11 1665 pkcs11_init(1); 1666 #endif 1667 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1668 if (pkcs11provider != NULL) { 1669 /* If a PKCS#11 token was specified then try to use it */ 1670 if ((ca = load_pkcs11_key(tmp)) == NULL) 1671 fatal("No PKCS#11 key matching %s found", ca_key_path); 1672 } else if (prefer_agent) { 1673 /* 1674 * Agent signature requested. Try to use agent after making 1675 * sure the public key specified is actually present in the 1676 * agent. 1677 */ 1678 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 1679 fatal("Cannot load CA public key %s: %s", 1680 tmp, ssh_err(r)); 1681 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 1682 fatal("Cannot use public key for CA signature: %s", 1683 ssh_err(r)); 1684 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0) 1685 fatal("Retrieve agent key list: %s", ssh_err(r)); 1686 found = 0; 1687 for (j = 0; j < agent_ids->nkeys; j++) { 1688 if (sshkey_equal(ca, agent_ids->keys[j])) { 1689 found = 1; 1690 break; 1691 } 1692 } 1693 if (!found) 1694 fatal("CA key %s not found in agent", tmp); 1695 ssh_free_identitylist(agent_ids); 1696 ca->flags |= SSHKEY_FLAG_EXT; 1697 } else { 1698 /* CA key is assumed to be a private key on the filesystem */ 1699 ca = load_identity(tmp); 1700 } 1701 free(tmp); 1702 1703 if (key_type_name != NULL && 1704 sshkey_type_from_name(key_type_name) != ca->type) { 1705 fatal("CA key type %s doesn't match specified %s", 1706 sshkey_ssh_name(ca), key_type_name); 1707 } 1708 1709 for (i = 0; i < argc; i++) { 1710 /* Split list of principals */ 1711 n = 0; 1712 if (cert_principals != NULL) { 1713 otmp = tmp = xstrdup(cert_principals); 1714 plist = NULL; 1715 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1716 plist = xreallocarray(plist, n + 1, sizeof(*plist)); 1717 if (*(plist[n] = xstrdup(cp)) == '\0') 1718 fatal("Empty principal name"); 1719 } 1720 free(otmp); 1721 } 1722 1723 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1724 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0) 1725 fatal("%s: unable to open \"%s\": %s", 1726 __func__, tmp, ssh_err(r)); 1727 if (public->type != KEY_RSA && public->type != KEY_DSA && 1728 public->type != KEY_ECDSA && public->type != KEY_ED25519) 1729 fatal("%s: key \"%s\" type %s cannot be certified", 1730 __func__, tmp, sshkey_type(public)); 1731 1732 /* Prepare certificate to sign */ 1733 if ((r = sshkey_to_certified(public)) != 0) 1734 fatal("Could not upgrade key %s to certificate: %s", 1735 tmp, ssh_err(r)); 1736 public->cert->type = cert_key_type; 1737 public->cert->serial = (u_int64_t)cert_serial; 1738 public->cert->key_id = xstrdup(cert_key_id); 1739 public->cert->nprincipals = n; 1740 public->cert->principals = plist; 1741 public->cert->valid_after = cert_valid_from; 1742 public->cert->valid_before = cert_valid_to; 1743 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL); 1744 prepare_options_buf(public->cert->extensions, 1745 OPTIONS_EXTENSIONS); 1746 if ((r = sshkey_from_private(ca, 1747 &public->cert->signature_key)) != 0) 1748 fatal("sshkey_from_private (ca key): %s", ssh_err(r)); 1749 1750 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) { 1751 if ((r = sshkey_certify_custom(public, ca, 1752 key_type_name, agent_signer, &agent_fd)) != 0) 1753 fatal("Couldn't certify key %s via agent: %s", 1754 tmp, ssh_err(r)); 1755 } else { 1756 if ((sshkey_certify(public, ca, key_type_name)) != 0) 1757 fatal("Couldn't certify key %s: %s", 1758 tmp, ssh_err(r)); 1759 } 1760 1761 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1762 *cp = '\0'; 1763 xasprintf(&out, "%s-cert.pub", tmp); 1764 free(tmp); 1765 1766 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1767 fatal("Could not open \"%s\" for writing: %s", out, 1768 strerror(errno)); 1769 if ((f = fdopen(fd, "w")) == NULL) 1770 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1771 if ((r = sshkey_write(public, f)) != 0) 1772 fatal("Could not write certified key to %s: %s", 1773 out, ssh_err(r)); 1774 fprintf(f, " %s\n", comment); 1775 fclose(f); 1776 1777 if (!quiet) { 1778 sshkey_format_cert_validity(public->cert, 1779 valid, sizeof(valid)); 1780 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1781 "valid %s", sshkey_cert_type(public), 1782 out, public->cert->key_id, 1783 (unsigned long long)public->cert->serial, 1784 cert_principals != NULL ? " for " : "", 1785 cert_principals != NULL ? cert_principals : "", 1786 valid); 1787 } 1788 1789 sshkey_free(public); 1790 free(out); 1791 } 1792 #ifdef ENABLE_PKCS11 1793 pkcs11_terminate(); 1794 #endif 1795 exit(0); 1796 } 1797 1798 static u_int64_t 1799 parse_relative_time(const char *s, time_t now) 1800 { 1801 int64_t mul, secs; 1802 1803 mul = *s == '-' ? -1 : 1; 1804 1805 if ((secs = convtime(s + 1)) == -1) 1806 fatal("Invalid relative certificate time %s", s); 1807 if (mul == -1 && secs > now) 1808 fatal("Certificate time %s cannot be represented", s); 1809 return now + (u_int64_t)(secs * mul); 1810 } 1811 1812 static u_int64_t 1813 parse_absolute_time(const char *s) 1814 { 1815 struct tm tm; 1816 time_t tt; 1817 char buf[32], *fmt; 1818 1819 /* 1820 * POSIX strptime says "The application shall ensure that there 1821 * is white-space or other non-alphanumeric characters between 1822 * any two conversion specifications" so arrange things this way. 1823 */ 1824 switch (strlen(s)) { 1825 case 8: 1826 fmt = "%Y-%m-%d"; 1827 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1828 break; 1829 case 14: 1830 fmt = "%Y-%m-%dT%H:%M:%S"; 1831 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1832 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1833 break; 1834 default: 1835 fatal("Invalid certificate time format %s", s); 1836 } 1837 1838 memset(&tm, 0, sizeof(tm)); 1839 if (strptime(buf, fmt, &tm) == NULL) 1840 fatal("Invalid certificate time %s", s); 1841 if ((tt = mktime(&tm)) < 0) 1842 fatal("Certificate time %s cannot be represented", s); 1843 return (u_int64_t)tt; 1844 } 1845 1846 static void 1847 parse_cert_times(char *timespec) 1848 { 1849 char *from, *to; 1850 time_t now = time(NULL); 1851 int64_t secs; 1852 1853 /* +timespec relative to now */ 1854 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1855 if ((secs = convtime(timespec + 1)) == -1) 1856 fatal("Invalid relative certificate life %s", timespec); 1857 cert_valid_to = now + secs; 1858 /* 1859 * Backdate certificate one minute to avoid problems on hosts 1860 * with poorly-synchronised clocks. 1861 */ 1862 cert_valid_from = ((now - 59)/ 60) * 60; 1863 return; 1864 } 1865 1866 /* 1867 * from:to, where 1868 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1869 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1870 */ 1871 from = xstrdup(timespec); 1872 to = strchr(from, ':'); 1873 if (to == NULL || from == to || *(to + 1) == '\0') 1874 fatal("Invalid certificate life specification %s", timespec); 1875 *to++ = '\0'; 1876 1877 if (*from == '-' || *from == '+') 1878 cert_valid_from = parse_relative_time(from, now); 1879 else 1880 cert_valid_from = parse_absolute_time(from); 1881 1882 if (*to == '-' || *to == '+') 1883 cert_valid_to = parse_relative_time(to, now); 1884 else 1885 cert_valid_to = parse_absolute_time(to); 1886 1887 if (cert_valid_to <= cert_valid_from) 1888 fatal("Empty certificate validity interval"); 1889 free(from); 1890 } 1891 1892 static void 1893 add_cert_option(char *opt) 1894 { 1895 char *val, *cp; 1896 int iscrit = 0; 1897 1898 if (strcasecmp(opt, "clear") == 0) 1899 certflags_flags = 0; 1900 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1901 certflags_flags &= ~CERTOPT_X_FWD; 1902 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1903 certflags_flags |= CERTOPT_X_FWD; 1904 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1905 certflags_flags &= ~CERTOPT_AGENT_FWD; 1906 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1907 certflags_flags |= CERTOPT_AGENT_FWD; 1908 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1909 certflags_flags &= ~CERTOPT_PORT_FWD; 1910 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1911 certflags_flags |= CERTOPT_PORT_FWD; 1912 else if (strcasecmp(opt, "no-pty") == 0) 1913 certflags_flags &= ~CERTOPT_PTY; 1914 else if (strcasecmp(opt, "permit-pty") == 0) 1915 certflags_flags |= CERTOPT_PTY; 1916 else if (strcasecmp(opt, "no-user-rc") == 0) 1917 certflags_flags &= ~CERTOPT_USER_RC; 1918 else if (strcasecmp(opt, "permit-user-rc") == 0) 1919 certflags_flags |= CERTOPT_USER_RC; 1920 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1921 val = opt + 14; 1922 if (*val == '\0') 1923 fatal("Empty force-command option"); 1924 if (certflags_command != NULL) 1925 fatal("force-command already specified"); 1926 certflags_command = xstrdup(val); 1927 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1928 val = opt + 15; 1929 if (*val == '\0') 1930 fatal("Empty source-address option"); 1931 if (certflags_src_addr != NULL) 1932 fatal("source-address already specified"); 1933 if (addr_match_cidr_list(NULL, val) != 0) 1934 fatal("Invalid source-address list"); 1935 certflags_src_addr = xstrdup(val); 1936 } else if (strncasecmp(opt, "extension:", 10) == 0 || 1937 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) { 1938 val = xstrdup(strchr(opt, ':') + 1); 1939 if ((cp = strchr(val, '=')) != NULL) 1940 *cp++ = '\0'; 1941 cert_userext = xreallocarray(cert_userext, ncert_userext + 1, 1942 sizeof(*cert_userext)); 1943 cert_userext[ncert_userext].key = val; 1944 cert_userext[ncert_userext].val = cp == NULL ? 1945 NULL : xstrdup(cp); 1946 cert_userext[ncert_userext].crit = iscrit; 1947 ncert_userext++; 1948 } else 1949 fatal("Unsupported certificate option \"%s\"", opt); 1950 } 1951 1952 static void 1953 show_options(struct sshbuf *optbuf, int in_critical) 1954 { 1955 char *name, *arg; 1956 struct sshbuf *options, *option = NULL; 1957 int r; 1958 1959 if ((options = sshbuf_fromb(optbuf)) == NULL) 1960 fatal("%s: sshbuf_fromb failed", __func__); 1961 while (sshbuf_len(options) != 0) { 1962 sshbuf_free(option); 1963 option = NULL; 1964 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 || 1965 (r = sshbuf_froms(options, &option)) != 0) 1966 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1967 printf(" %s", name); 1968 if (!in_critical && 1969 (strcmp(name, "permit-X11-forwarding") == 0 || 1970 strcmp(name, "permit-agent-forwarding") == 0 || 1971 strcmp(name, "permit-port-forwarding") == 0 || 1972 strcmp(name, "permit-pty") == 0 || 1973 strcmp(name, "permit-user-rc") == 0)) 1974 printf("\n"); 1975 else if (in_critical && 1976 (strcmp(name, "force-command") == 0 || 1977 strcmp(name, "source-address") == 0)) { 1978 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0) 1979 fatal("%s: buffer error: %s", 1980 __func__, ssh_err(r)); 1981 printf(" %s\n", arg); 1982 free(arg); 1983 } else { 1984 printf(" UNKNOWN OPTION (len %zu)\n", 1985 sshbuf_len(option)); 1986 sshbuf_reset(option); 1987 } 1988 free(name); 1989 if (sshbuf_len(option) != 0) 1990 fatal("Option corrupt: extra data at end"); 1991 } 1992 sshbuf_free(option); 1993 sshbuf_free(options); 1994 } 1995 1996 static void 1997 print_cert(struct sshkey *key) 1998 { 1999 char valid[64], *key_fp, *ca_fp; 2000 u_int i; 2001 2002 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT); 2003 ca_fp = sshkey_fingerprint(key->cert->signature_key, 2004 fingerprint_hash, SSH_FP_DEFAULT); 2005 if (key_fp == NULL || ca_fp == NULL) 2006 fatal("%s: sshkey_fingerprint fail", __func__); 2007 sshkey_format_cert_validity(key->cert, valid, sizeof(valid)); 2008 2009 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key), 2010 sshkey_cert_type(key)); 2011 printf(" Public key: %s %s\n", sshkey_type(key), key_fp); 2012 printf(" Signing CA: %s %s\n", 2013 sshkey_type(key->cert->signature_key), ca_fp); 2014 printf(" Key ID: \"%s\"\n", key->cert->key_id); 2015 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial); 2016 printf(" Valid: %s\n", valid); 2017 printf(" Principals: "); 2018 if (key->cert->nprincipals == 0) 2019 printf("(none)\n"); 2020 else { 2021 for (i = 0; i < key->cert->nprincipals; i++) 2022 printf("\n %s", 2023 key->cert->principals[i]); 2024 printf("\n"); 2025 } 2026 printf(" Critical Options: "); 2027 if (sshbuf_len(key->cert->critical) == 0) 2028 printf("(none)\n"); 2029 else { 2030 printf("\n"); 2031 show_options(key->cert->critical, 1); 2032 } 2033 printf(" Extensions: "); 2034 if (sshbuf_len(key->cert->extensions) == 0) 2035 printf("(none)\n"); 2036 else { 2037 printf("\n"); 2038 show_options(key->cert->extensions, 0); 2039 } 2040 } 2041 2042 static void 2043 do_show_cert(struct passwd *pw) 2044 { 2045 struct sshkey *key = NULL; 2046 struct stat st; 2047 int r, is_stdin = 0, ok = 0; 2048 FILE *f; 2049 char *cp, line[SSH_MAX_PUBKEY_BYTES]; 2050 const char *path; 2051 u_long lnum = 0; 2052 2053 if (!have_identity) 2054 ask_filename(pw, "Enter file in which the key is"); 2055 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) < 0) 2056 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 2057 2058 path = identity_file; 2059 if (strcmp(path, "-") == 0) { 2060 f = stdin; 2061 path = "(stdin)"; 2062 is_stdin = 1; 2063 } else if ((f = fopen(identity_file, "r")) == NULL) 2064 fatal("fopen %s: %s", identity_file, strerror(errno)); 2065 2066 while (read_keyfile_line(f, path, line, sizeof(line), &lnum) == 0) { 2067 sshkey_free(key); 2068 key = NULL; 2069 /* Trim leading space and comments */ 2070 cp = line + strspn(line, " \t"); 2071 if (*cp == '#' || *cp == '\0') 2072 continue; 2073 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2074 fatal("sshkey_new"); 2075 if ((r = sshkey_read(key, &cp)) != 0) { 2076 error("%s:%lu: invalid key: %s", path, 2077 lnum, ssh_err(r)); 2078 continue; 2079 } 2080 if (!sshkey_is_cert(key)) { 2081 error("%s:%lu is not a certificate", path, lnum); 2082 continue; 2083 } 2084 ok = 1; 2085 if (!is_stdin && lnum == 1) 2086 printf("%s:\n", path); 2087 else 2088 printf("%s:%lu:\n", path, lnum); 2089 print_cert(key); 2090 } 2091 sshkey_free(key); 2092 fclose(f); 2093 exit(ok ? 0 : 1); 2094 } 2095 2096 static void 2097 load_krl(const char *path, struct ssh_krl **krlp) 2098 { 2099 struct sshbuf *krlbuf; 2100 int r, fd; 2101 2102 if ((krlbuf = sshbuf_new()) == NULL) 2103 fatal("sshbuf_new failed"); 2104 if ((fd = open(path, O_RDONLY)) == -1) 2105 fatal("open %s: %s", path, strerror(errno)); 2106 if ((r = sshkey_load_file(fd, krlbuf)) != 0) 2107 fatal("Unable to load KRL: %s", ssh_err(r)); 2108 close(fd); 2109 /* XXX check sigs */ 2110 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 || 2111 *krlp == NULL) 2112 fatal("Invalid KRL file: %s", ssh_err(r)); 2113 sshbuf_free(krlbuf); 2114 } 2115 2116 static void 2117 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca, 2118 const struct sshkey *ca, struct ssh_krl *krl) 2119 { 2120 struct sshkey *key = NULL; 2121 u_long lnum = 0; 2122 char *path, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES]; 2123 unsigned long long serial, serial2; 2124 int i, was_explicit_key, was_sha1, r; 2125 FILE *krl_spec; 2126 2127 path = tilde_expand_filename(file, pw->pw_uid); 2128 if (strcmp(path, "-") == 0) { 2129 krl_spec = stdin; 2130 free(path); 2131 path = xstrdup("(standard input)"); 2132 } else if ((krl_spec = fopen(path, "r")) == NULL) 2133 fatal("fopen %s: %s", path, strerror(errno)); 2134 2135 if (!quiet) 2136 printf("Revoking from %s\n", path); 2137 while (read_keyfile_line(krl_spec, path, line, sizeof(line), 2138 &lnum) == 0) { 2139 was_explicit_key = was_sha1 = 0; 2140 cp = line + strspn(line, " \t"); 2141 /* Trim trailing space, comments and strip \n */ 2142 for (i = 0, r = -1; cp[i] != '\0'; i++) { 2143 if (cp[i] == '#' || cp[i] == '\n') { 2144 cp[i] = '\0'; 2145 break; 2146 } 2147 if (cp[i] == ' ' || cp[i] == '\t') { 2148 /* Remember the start of a span of whitespace */ 2149 if (r == -1) 2150 r = i; 2151 } else 2152 r = -1; 2153 } 2154 if (r != -1) 2155 cp[r] = '\0'; 2156 if (*cp == '\0') 2157 continue; 2158 if (strncasecmp(cp, "serial:", 7) == 0) { 2159 if (ca == NULL && !wild_ca) { 2160 fatal("revoking certificates by serial number " 2161 "requires specification of a CA key"); 2162 } 2163 cp += 7; 2164 cp = cp + strspn(cp, " \t"); 2165 errno = 0; 2166 serial = strtoull(cp, &ep, 0); 2167 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 2168 fatal("%s:%lu: invalid serial \"%s\"", 2169 path, lnum, cp); 2170 if (errno == ERANGE && serial == ULLONG_MAX) 2171 fatal("%s:%lu: serial out of range", 2172 path, lnum); 2173 serial2 = serial; 2174 if (*ep == '-') { 2175 cp = ep + 1; 2176 errno = 0; 2177 serial2 = strtoull(cp, &ep, 0); 2178 if (*cp == '\0' || *ep != '\0') 2179 fatal("%s:%lu: invalid serial \"%s\"", 2180 path, lnum, cp); 2181 if (errno == ERANGE && serial2 == ULLONG_MAX) 2182 fatal("%s:%lu: serial out of range", 2183 path, lnum); 2184 if (serial2 <= serial) 2185 fatal("%s:%lu: invalid serial range " 2186 "%llu:%llu", path, lnum, 2187 (unsigned long long)serial, 2188 (unsigned long long)serial2); 2189 } 2190 if (ssh_krl_revoke_cert_by_serial_range(krl, 2191 ca, serial, serial2) != 0) { 2192 fatal("%s: revoke serial failed", 2193 __func__); 2194 } 2195 } else if (strncasecmp(cp, "id:", 3) == 0) { 2196 if (ca == NULL && !wild_ca) { 2197 fatal("revoking certificates by key ID " 2198 "requires specification of a CA key"); 2199 } 2200 cp += 3; 2201 cp = cp + strspn(cp, " \t"); 2202 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2203 fatal("%s: revoke key ID failed", __func__); 2204 } else { 2205 if (strncasecmp(cp, "key:", 4) == 0) { 2206 cp += 4; 2207 cp = cp + strspn(cp, " \t"); 2208 was_explicit_key = 1; 2209 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2210 cp += 5; 2211 cp = cp + strspn(cp, " \t"); 2212 was_sha1 = 1; 2213 } else { 2214 /* 2215 * Just try to process the line as a key. 2216 * Parsing will fail if it isn't. 2217 */ 2218 } 2219 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2220 fatal("sshkey_new"); 2221 if ((r = sshkey_read(key, &cp)) != 0) 2222 fatal("%s:%lu: invalid key: %s", 2223 path, lnum, ssh_err(r)); 2224 if (was_explicit_key) 2225 r = ssh_krl_revoke_key_explicit(krl, key); 2226 else if (was_sha1) 2227 r = ssh_krl_revoke_key_sha1(krl, key); 2228 else 2229 r = ssh_krl_revoke_key(krl, key); 2230 if (r != 0) 2231 fatal("%s: revoke key failed: %s", 2232 __func__, ssh_err(r)); 2233 sshkey_free(key); 2234 } 2235 } 2236 if (strcmp(path, "-") != 0) 2237 fclose(krl_spec); 2238 free(path); 2239 } 2240 2241 static void 2242 do_gen_krl(struct passwd *pw, int updating, int argc, char **argv) 2243 { 2244 struct ssh_krl *krl; 2245 struct stat sb; 2246 struct sshkey *ca = NULL; 2247 int fd, i, r, wild_ca = 0; 2248 char *tmp; 2249 struct sshbuf *kbuf; 2250 2251 if (*identity_file == '\0') 2252 fatal("KRL generation requires an output file"); 2253 if (stat(identity_file, &sb) == -1) { 2254 if (errno != ENOENT) 2255 fatal("Cannot access KRL \"%s\": %s", 2256 identity_file, strerror(errno)); 2257 if (updating) 2258 fatal("KRL \"%s\" does not exist", identity_file); 2259 } 2260 if (ca_key_path != NULL) { 2261 if (strcasecmp(ca_key_path, "none") == 0) 2262 wild_ca = 1; 2263 else { 2264 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2265 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 2266 fatal("Cannot load CA public key %s: %s", 2267 tmp, ssh_err(r)); 2268 free(tmp); 2269 } 2270 } 2271 2272 if (updating) 2273 load_krl(identity_file, &krl); 2274 else if ((krl = ssh_krl_init()) == NULL) 2275 fatal("couldn't create KRL"); 2276 2277 if (cert_serial != 0) 2278 ssh_krl_set_version(krl, cert_serial); 2279 if (identity_comment != NULL) 2280 ssh_krl_set_comment(krl, identity_comment); 2281 2282 for (i = 0; i < argc; i++) 2283 update_krl_from_file(pw, argv[i], wild_ca, ca, krl); 2284 2285 if ((kbuf = sshbuf_new()) == NULL) 2286 fatal("sshbuf_new failed"); 2287 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0) 2288 fatal("Couldn't generate KRL"); 2289 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2290 fatal("open %s: %s", identity_file, strerror(errno)); 2291 if (atomicio(vwrite, fd, (void *)sshbuf_ptr(kbuf), sshbuf_len(kbuf)) != 2292 sshbuf_len(kbuf)) 2293 fatal("write %s: %s", identity_file, strerror(errno)); 2294 close(fd); 2295 sshbuf_free(kbuf); 2296 ssh_krl_free(krl); 2297 sshkey_free(ca); 2298 } 2299 2300 static void 2301 do_check_krl(struct passwd *pw, int argc, char **argv) 2302 { 2303 int i, r, ret = 0; 2304 char *comment; 2305 struct ssh_krl *krl; 2306 struct sshkey *k; 2307 2308 if (*identity_file == '\0') 2309 fatal("KRL checking requires an input file"); 2310 load_krl(identity_file, &krl); 2311 for (i = 0; i < argc; i++) { 2312 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0) 2313 fatal("Cannot load public key %s: %s", 2314 argv[i], ssh_err(r)); 2315 r = ssh_krl_check_key(krl, k); 2316 printf("%s%s%s%s: %s\n", argv[i], 2317 *comment ? " (" : "", comment, *comment ? ")" : "", 2318 r == 0 ? "ok" : "REVOKED"); 2319 if (r != 0) 2320 ret = 1; 2321 sshkey_free(k); 2322 free(comment); 2323 } 2324 ssh_krl_free(krl); 2325 exit(ret); 2326 } 2327 2328 static void 2329 usage(void) 2330 { 2331 fprintf(stderr, 2332 "usage: ssh-keygen [-q] [-b bits] [-t dsa | ecdsa | ed25519 | rsa]\n" 2333 " [-N new_passphrase] [-C comment] [-f output_keyfile]\n" 2334 " ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]\n" 2335 " ssh-keygen -i [-m key_format] [-f input_keyfile]\n" 2336 " ssh-keygen -e [-m key_format] [-f input_keyfile]\n" 2337 " ssh-keygen -y [-f input_keyfile]\n" 2338 " ssh-keygen -c [-P passphrase] [-C comment] [-f keyfile]\n" 2339 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n" 2340 " ssh-keygen -B [-f input_keyfile]\n"); 2341 #ifdef ENABLE_PKCS11 2342 fprintf(stderr, 2343 " ssh-keygen -D pkcs11\n"); 2344 #endif 2345 fprintf(stderr, 2346 " ssh-keygen -F hostname [-f known_hosts_file] [-l]\n" 2347 " ssh-keygen -H [-f known_hosts_file]\n" 2348 " ssh-keygen -R hostname [-f known_hosts_file]\n" 2349 " ssh-keygen -r hostname [-f input_keyfile] [-g]\n" 2350 #ifdef WITH_OPENSSL 2351 " ssh-keygen -G output_file [-v] [-b bits] [-M memory] [-S start_point]\n" 2352 " ssh-keygen -T output_file -f input_file [-v] [-a rounds] [-J num_lines]\n" 2353 " [-j start_line] [-K checkpt] [-W generator]\n" 2354 #endif 2355 " ssh-keygen -s ca_key -I certificate_identity [-h] [-U]\n" 2356 " [-D pkcs11_provider] [-n principals] [-O option]\n" 2357 " [-V validity_interval] [-z serial_number] file ...\n" 2358 " ssh-keygen -L [-f input_keyfile]\n" 2359 " ssh-keygen -A\n" 2360 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n" 2361 " file ...\n" 2362 " ssh-keygen -Q -f krl_file file ...\n"); 2363 exit(1); 2364 } 2365 2366 /* 2367 * Main program for key management. 2368 */ 2369 int 2370 main(int argc, char **argv) 2371 { 2372 char dotsshdir[PATH_MAX], comment[1024], *passphrase1, *passphrase2; 2373 char *rr_hostname = NULL, *ep, *fp, *ra; 2374 struct sshkey *private, *public; 2375 struct passwd *pw; 2376 struct stat st; 2377 int r, opt, type, fd; 2378 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 2379 FILE *f; 2380 const char *errstr; 2381 #ifdef WITH_OPENSSL 2382 /* Moduli generation/screening */ 2383 char out_file[PATH_MAX], *checkpoint = NULL; 2384 u_int32_t memory = 0, generator_wanted = 0; 2385 int do_gen_candidates = 0, do_screen_candidates = 0; 2386 unsigned long start_lineno = 0, lines_to_process = 0; 2387 BIGNUM *start = NULL; 2388 #endif 2389 2390 extern int optind; 2391 extern char *optarg; 2392 2393 ssh_malloc_init(); /* must be called before any mallocs */ 2394 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 2395 sanitise_stdfd(); 2396 2397 __progname = ssh_get_progname(argv[0]); 2398 2399 #ifdef WITH_OPENSSL 2400 OpenSSL_add_all_algorithms(); 2401 #endif 2402 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 2403 2404 seed_rng(); 2405 2406 msetlocale(); 2407 2408 /* we need this for the home * directory. */ 2409 pw = getpwuid(getuid()); 2410 if (!pw) 2411 fatal("No user exists for uid %lu", (u_long)getuid()); 2412 if (gethostname(hostname, sizeof(hostname)) < 0) 2413 fatal("gethostname: %s", strerror(errno)); 2414 2415 /* Remaining characters: Ydw */ 2416 while ((opt = getopt(argc, argv, "ABHLQUXceghiklopquvxy" 2417 "C:D:E:F:G:I:J:K:M:N:O:P:R:S:T:V:W:Z:" 2418 "a:b:f:g:j:m:n:r:s:t:z:")) != -1) { 2419 switch (opt) { 2420 case 'A': 2421 gen_all_hostkeys = 1; 2422 break; 2423 case 'b': 2424 bits = (u_int32_t)strtonum(optarg, 256, 32768, &errstr); 2425 if (errstr) 2426 fatal("Bits has bad value %s (%s)", 2427 optarg, errstr); 2428 break; 2429 case 'E': 2430 fingerprint_hash = ssh_digest_alg_by_name(optarg); 2431 if (fingerprint_hash == -1) 2432 fatal("Invalid hash algorithm \"%s\"", optarg); 2433 break; 2434 case 'F': 2435 find_host = 1; 2436 rr_hostname = optarg; 2437 break; 2438 case 'H': 2439 hash_hosts = 1; 2440 break; 2441 case 'I': 2442 cert_key_id = optarg; 2443 break; 2444 case 'R': 2445 delete_host = 1; 2446 rr_hostname = optarg; 2447 break; 2448 case 'L': 2449 show_cert = 1; 2450 break; 2451 case 'l': 2452 print_fingerprint = 1; 2453 break; 2454 case 'B': 2455 print_bubblebabble = 1; 2456 break; 2457 case 'm': 2458 if (strcasecmp(optarg, "RFC4716") == 0 || 2459 strcasecmp(optarg, "ssh2") == 0) { 2460 convert_format = FMT_RFC4716; 2461 break; 2462 } 2463 if (strcasecmp(optarg, "PKCS8") == 0) { 2464 convert_format = FMT_PKCS8; 2465 break; 2466 } 2467 if (strcasecmp(optarg, "PEM") == 0) { 2468 convert_format = FMT_PEM; 2469 break; 2470 } 2471 fatal("Unsupported conversion format \"%s\"", optarg); 2472 case 'n': 2473 cert_principals = optarg; 2474 break; 2475 case 'o': 2476 use_new_format = 1; 2477 break; 2478 case 'p': 2479 change_passphrase = 1; 2480 break; 2481 case 'c': 2482 change_comment = 1; 2483 break; 2484 case 'f': 2485 if (strlcpy(identity_file, optarg, 2486 sizeof(identity_file)) >= sizeof(identity_file)) 2487 fatal("Identity filename too long"); 2488 have_identity = 1; 2489 break; 2490 case 'g': 2491 print_generic = 1; 2492 break; 2493 case 'P': 2494 identity_passphrase = optarg; 2495 break; 2496 case 'N': 2497 identity_new_passphrase = optarg; 2498 break; 2499 case 'Q': 2500 check_krl = 1; 2501 break; 2502 case 'O': 2503 add_cert_option(optarg); 2504 break; 2505 case 'Z': 2506 new_format_cipher = optarg; 2507 break; 2508 case 'C': 2509 identity_comment = optarg; 2510 break; 2511 case 'q': 2512 quiet = 1; 2513 break; 2514 case 'e': 2515 case 'x': 2516 /* export key */ 2517 convert_to = 1; 2518 break; 2519 case 'h': 2520 cert_key_type = SSH2_CERT_TYPE_HOST; 2521 certflags_flags = 0; 2522 break; 2523 case 'k': 2524 gen_krl = 1; 2525 break; 2526 case 'i': 2527 case 'X': 2528 /* import key */ 2529 convert_from = 1; 2530 break; 2531 case 'y': 2532 print_public = 1; 2533 break; 2534 case 's': 2535 ca_key_path = optarg; 2536 break; 2537 case 't': 2538 key_type_name = optarg; 2539 break; 2540 case 'D': 2541 pkcs11provider = optarg; 2542 break; 2543 case 'U': 2544 prefer_agent = 1; 2545 break; 2546 case 'u': 2547 update_krl = 1; 2548 break; 2549 case 'v': 2550 if (log_level == SYSLOG_LEVEL_INFO) 2551 log_level = SYSLOG_LEVEL_DEBUG1; 2552 else { 2553 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2554 log_level < SYSLOG_LEVEL_DEBUG3) 2555 log_level++; 2556 } 2557 break; 2558 case 'r': 2559 rr_hostname = optarg; 2560 break; 2561 case 'a': 2562 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr); 2563 if (errstr) 2564 fatal("Invalid number: %s (%s)", 2565 optarg, errstr); 2566 break; 2567 case 'V': 2568 parse_cert_times(optarg); 2569 break; 2570 case 'z': 2571 errno = 0; 2572 cert_serial = strtoull(optarg, &ep, 10); 2573 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 2574 (errno == ERANGE && cert_serial == ULLONG_MAX)) 2575 fatal("Invalid serial number \"%s\"", optarg); 2576 break; 2577 #ifdef WITH_OPENSSL 2578 /* Moduli generation/screening */ 2579 case 'G': 2580 do_gen_candidates = 1; 2581 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2582 sizeof(out_file)) 2583 fatal("Output filename too long"); 2584 break; 2585 case 'J': 2586 lines_to_process = strtoul(optarg, NULL, 10); 2587 break; 2588 case 'j': 2589 start_lineno = strtoul(optarg, NULL, 10); 2590 break; 2591 case 'K': 2592 if (strlen(optarg) >= PATH_MAX) 2593 fatal("Checkpoint filename too long"); 2594 checkpoint = xstrdup(optarg); 2595 break; 2596 case 'M': 2597 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, 2598 &errstr); 2599 if (errstr) 2600 fatal("Memory limit is %s: %s", errstr, optarg); 2601 break; 2602 case 'S': 2603 /* XXX - also compare length against bits */ 2604 if (BN_hex2bn(&start, optarg) == 0) 2605 fatal("Invalid start point."); 2606 break; 2607 case 'T': 2608 do_screen_candidates = 1; 2609 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2610 sizeof(out_file)) 2611 fatal("Output filename too long"); 2612 break; 2613 case 'W': 2614 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2615 UINT_MAX, &errstr); 2616 if (errstr != NULL) 2617 fatal("Desired generator invalid: %s (%s)", 2618 optarg, errstr); 2619 break; 2620 #endif /* WITH_OPENSSL */ 2621 case '?': 2622 default: 2623 usage(); 2624 } 2625 } 2626 2627 /* reinit */ 2628 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2629 2630 argv += optind; 2631 argc -= optind; 2632 2633 if (ca_key_path != NULL) { 2634 if (argc < 1 && !gen_krl) { 2635 error("Too few arguments."); 2636 usage(); 2637 } 2638 } else if (argc > 0 && !gen_krl && !check_krl) { 2639 error("Too many arguments."); 2640 usage(); 2641 } 2642 if (change_passphrase && change_comment) { 2643 error("Can only have one of -p and -c."); 2644 usage(); 2645 } 2646 if (print_fingerprint && (delete_host || hash_hosts)) { 2647 error("Cannot use -l with -H or -R."); 2648 usage(); 2649 } 2650 if (gen_krl) { 2651 do_gen_krl(pw, update_krl, argc, argv); 2652 return (0); 2653 } 2654 if (check_krl) { 2655 do_check_krl(pw, argc, argv); 2656 return (0); 2657 } 2658 if (ca_key_path != NULL) { 2659 if (cert_key_id == NULL) 2660 fatal("Must specify key id (-I) when certifying"); 2661 do_ca_sign(pw, argc, argv); 2662 } 2663 if (show_cert) 2664 do_show_cert(pw); 2665 if (delete_host || hash_hosts || find_host) 2666 do_known_hosts(pw, rr_hostname); 2667 if (pkcs11provider != NULL) 2668 do_download(pw); 2669 if (print_fingerprint || print_bubblebabble) 2670 do_fingerprint(pw); 2671 if (change_passphrase) 2672 do_change_passphrase(pw); 2673 if (change_comment) 2674 do_change_comment(pw); 2675 #ifdef WITH_OPENSSL 2676 if (convert_to) 2677 do_convert_to(pw); 2678 if (convert_from) 2679 do_convert_from(pw); 2680 #endif 2681 if (print_public) 2682 do_print_public(pw); 2683 if (rr_hostname != NULL) { 2684 unsigned int n = 0; 2685 2686 if (have_identity) { 2687 n = do_print_resource_record(pw, 2688 identity_file, rr_hostname); 2689 if (n == 0) 2690 fatal("%s: %s", identity_file, strerror(errno)); 2691 exit(0); 2692 } else { 2693 2694 n += do_print_resource_record(pw, 2695 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2696 n += do_print_resource_record(pw, 2697 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2698 n += do_print_resource_record(pw, 2699 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname); 2700 n += do_print_resource_record(pw, 2701 _PATH_HOST_ED25519_KEY_FILE, rr_hostname); 2702 if (n == 0) 2703 fatal("no keys found."); 2704 exit(0); 2705 } 2706 } 2707 2708 #ifdef WITH_OPENSSL 2709 if (do_gen_candidates) { 2710 FILE *out = fopen(out_file, "w"); 2711 2712 if (out == NULL) { 2713 error("Couldn't open modulus candidate file \"%s\": %s", 2714 out_file, strerror(errno)); 2715 return (1); 2716 } 2717 if (bits == 0) 2718 bits = DEFAULT_BITS; 2719 if (gen_candidates(out, memory, bits, start) != 0) 2720 fatal("modulus candidate generation failed"); 2721 2722 return (0); 2723 } 2724 2725 if (do_screen_candidates) { 2726 FILE *in; 2727 FILE *out = fopen(out_file, "a"); 2728 2729 if (have_identity && strcmp(identity_file, "-") != 0) { 2730 if ((in = fopen(identity_file, "r")) == NULL) { 2731 fatal("Couldn't open modulus candidate " 2732 "file \"%s\": %s", identity_file, 2733 strerror(errno)); 2734 } 2735 } else 2736 in = stdin; 2737 2738 if (out == NULL) { 2739 fatal("Couldn't open moduli file \"%s\": %s", 2740 out_file, strerror(errno)); 2741 } 2742 if (prime_test(in, out, rounds == 0 ? 100 : rounds, 2743 generator_wanted, checkpoint, 2744 start_lineno, lines_to_process) != 0) 2745 fatal("modulus screening failed"); 2746 return (0); 2747 } 2748 #endif 2749 2750 if (gen_all_hostkeys) { 2751 do_gen_all_hostkeys(pw); 2752 return (0); 2753 } 2754 2755 if (key_type_name == NULL) 2756 key_type_name = DEFAULT_KEY_TYPE_NAME; 2757 2758 type = sshkey_type_from_name(key_type_name); 2759 type_bits_valid(type, key_type_name, &bits); 2760 2761 if (!quiet) 2762 printf("Generating public/private %s key pair.\n", 2763 key_type_name); 2764 if ((r = sshkey_generate(type, bits, &private)) != 0) 2765 fatal("sshkey_generate failed"); 2766 if ((r = sshkey_from_private(private, &public)) != 0) 2767 fatal("sshkey_from_private failed: %s\n", ssh_err(r)); 2768 2769 if (!have_identity) 2770 ask_filename(pw, "Enter file in which to save the key"); 2771 2772 /* Create ~/.ssh directory if it doesn't already exist. */ 2773 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2774 pw->pw_dir, _PATH_SSH_USER_DIR); 2775 if (strstr(identity_file, dotsshdir) != NULL) { 2776 if (stat(dotsshdir, &st) < 0) { 2777 if (errno != ENOENT) { 2778 error("Could not stat %s: %s", dotsshdir, 2779 strerror(errno)); 2780 } else if (mkdir(dotsshdir, 0700) < 0) { 2781 error("Could not create directory '%s': %s", 2782 dotsshdir, strerror(errno)); 2783 } else if (!quiet) 2784 printf("Created directory '%s'.\n", dotsshdir); 2785 } 2786 } 2787 /* If the file already exists, ask the user to confirm. */ 2788 if (stat(identity_file, &st) >= 0) { 2789 char yesno[3]; 2790 printf("%s already exists.\n", identity_file); 2791 printf("Overwrite (y/n)? "); 2792 fflush(stdout); 2793 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2794 exit(1); 2795 if (yesno[0] != 'y' && yesno[0] != 'Y') 2796 exit(1); 2797 } 2798 /* Ask for a passphrase (twice). */ 2799 if (identity_passphrase) 2800 passphrase1 = xstrdup(identity_passphrase); 2801 else if (identity_new_passphrase) 2802 passphrase1 = xstrdup(identity_new_passphrase); 2803 else { 2804 passphrase_again: 2805 passphrase1 = 2806 read_passphrase("Enter passphrase (empty for no " 2807 "passphrase): ", RP_ALLOW_STDIN); 2808 passphrase2 = read_passphrase("Enter same passphrase again: ", 2809 RP_ALLOW_STDIN); 2810 if (strcmp(passphrase1, passphrase2) != 0) { 2811 /* 2812 * The passphrases do not match. Clear them and 2813 * retry. 2814 */ 2815 explicit_bzero(passphrase1, strlen(passphrase1)); 2816 explicit_bzero(passphrase2, strlen(passphrase2)); 2817 free(passphrase1); 2818 free(passphrase2); 2819 printf("Passphrases do not match. Try again.\n"); 2820 goto passphrase_again; 2821 } 2822 /* Clear the other copy of the passphrase. */ 2823 explicit_bzero(passphrase2, strlen(passphrase2)); 2824 free(passphrase2); 2825 } 2826 2827 if (identity_comment) { 2828 strlcpy(comment, identity_comment, sizeof(comment)); 2829 } else { 2830 /* Create default comment field for the passphrase. */ 2831 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2832 } 2833 2834 /* Save the key with the given passphrase and comment. */ 2835 if ((r = sshkey_save_private(private, identity_file, passphrase1, 2836 comment, use_new_format, new_format_cipher, rounds)) != 0) { 2837 error("Saving key \"%s\" failed: %s", 2838 identity_file, ssh_err(r)); 2839 explicit_bzero(passphrase1, strlen(passphrase1)); 2840 free(passphrase1); 2841 exit(1); 2842 } 2843 /* Clear the passphrase. */ 2844 explicit_bzero(passphrase1, strlen(passphrase1)); 2845 free(passphrase1); 2846 2847 /* Clear the private key and the random number generator. */ 2848 sshkey_free(private); 2849 2850 if (!quiet) 2851 printf("Your identification has been saved in %s.\n", identity_file); 2852 2853 strlcat(identity_file, ".pub", sizeof(identity_file)); 2854 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2855 fatal("Unable to save public key to %s: %s", 2856 identity_file, strerror(errno)); 2857 if ((f = fdopen(fd, "w")) == NULL) 2858 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 2859 if ((r = sshkey_write(public, f)) != 0) 2860 error("write key failed: %s", ssh_err(r)); 2861 fprintf(f, " %s\n", comment); 2862 fclose(f); 2863 2864 if (!quiet) { 2865 fp = sshkey_fingerprint(public, fingerprint_hash, 2866 SSH_FP_DEFAULT); 2867 ra = sshkey_fingerprint(public, fingerprint_hash, 2868 SSH_FP_RANDOMART); 2869 if (fp == NULL || ra == NULL) 2870 fatal("sshkey_fingerprint failed"); 2871 printf("Your public key has been saved in %s.\n", 2872 identity_file); 2873 printf("The key fingerprint is:\n"); 2874 printf("%s %s\n", fp, comment); 2875 printf("The key's randomart image is:\n"); 2876 printf("%s\n", ra); 2877 free(ra); 2878 free(fp); 2879 } 2880 2881 sshkey_free(public); 2882 exit(0); 2883 } 2884