1 /* $OpenBSD: ssh-keygen.c,v 1.292 2016/09/12 03:29:16 dtucker 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 41 #include "xmalloc.h" 42 #include "sshkey.h" 43 #include "rsa.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 61 #ifdef WITH_OPENSSL 62 # define DEFAULT_KEY_TYPE_NAME "rsa" 63 #else 64 # define DEFAULT_KEY_TYPE_NAME "ed25519" 65 #endif 66 67 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */ 68 #define DEFAULT_BITS 2048 69 #define DEFAULT_BITS_DSA 1024 70 #define DEFAULT_BITS_ECDSA 256 71 u_int32_t bits = 0; 72 73 /* 74 * Flag indicating that we just want to change the passphrase. This can be 75 * set on the command line. 76 */ 77 int change_passphrase = 0; 78 79 /* 80 * Flag indicating that we just want to change the comment. This can be set 81 * on the command line. 82 */ 83 int change_comment = 0; 84 85 int quiet = 0; 86 87 int log_level = SYSLOG_LEVEL_INFO; 88 89 /* Flag indicating that we want to hash a known_hosts file */ 90 int hash_hosts = 0; 91 /* Flag indicating that we want lookup a host in known_hosts file */ 92 int find_host = 0; 93 /* Flag indicating that we want to delete a host from a known_hosts file */ 94 int delete_host = 0; 95 96 /* Flag indicating that we want to show the contents of a certificate */ 97 int show_cert = 0; 98 99 /* Flag indicating that we just want to see the key fingerprint */ 100 int print_fingerprint = 0; 101 int print_bubblebabble = 0; 102 103 /* Hash algorithm to use for fingerprints. */ 104 int fingerprint_hash = SSH_FP_HASH_DEFAULT; 105 106 /* The identity file name, given on the command line or entered by the user. */ 107 char identity_file[1024]; 108 int have_identity = 0; 109 110 /* This is set to the passphrase if given on the command line. */ 111 char *identity_passphrase = NULL; 112 113 /* This is set to the new passphrase if given on the command line. */ 114 char *identity_new_passphrase = NULL; 115 116 /* This is set to the new comment if given on the command line. */ 117 char *identity_comment = NULL; 118 119 /* Path to CA key when certifying keys. */ 120 char *ca_key_path = NULL; 121 122 /* Certificate serial number */ 123 unsigned long long cert_serial = 0; 124 125 /* Key type when certifying */ 126 u_int cert_key_type = SSH2_CERT_TYPE_USER; 127 128 /* "key ID" of signed key */ 129 char *cert_key_id = NULL; 130 131 /* Comma-separated list of principal names for certifying keys */ 132 char *cert_principals = NULL; 133 134 /* Validity period for certificates */ 135 u_int64_t cert_valid_from = 0; 136 u_int64_t cert_valid_to = ~0ULL; 137 138 /* Certificate options */ 139 #define CERTOPT_X_FWD (1) 140 #define CERTOPT_AGENT_FWD (1<<1) 141 #define CERTOPT_PORT_FWD (1<<2) 142 #define CERTOPT_PTY (1<<3) 143 #define CERTOPT_USER_RC (1<<4) 144 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 145 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 146 u_int32_t certflags_flags = CERTOPT_DEFAULT; 147 char *certflags_command = NULL; 148 char *certflags_src_addr = NULL; 149 150 /* Conversion to/from various formats */ 151 int convert_to = 0; 152 int convert_from = 0; 153 enum { 154 FMT_RFC4716, 155 FMT_PKCS8, 156 FMT_PEM 157 } convert_format = FMT_RFC4716; 158 int print_public = 0; 159 int print_generic = 0; 160 161 char *key_type_name = NULL; 162 163 /* Load key from this PKCS#11 provider */ 164 char *pkcs11provider = NULL; 165 166 /* Use new OpenSSH private key format when writing SSH2 keys instead of PEM */ 167 int use_new_format = 0; 168 169 /* Cipher for new-format private keys */ 170 char *new_format_cipher = NULL; 171 172 /* 173 * Number of KDF rounds to derive new format keys / 174 * number of primality trials when screening moduli. 175 */ 176 int rounds = 0; 177 178 /* argv0 */ 179 extern char *__progname; 180 181 char hostname[NI_MAXHOST]; 182 183 #ifdef WITH_OPENSSL 184 /* moduli.c */ 185 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 186 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 187 unsigned long); 188 #endif 189 190 static void 191 type_bits_valid(int type, const char *name, u_int32_t *bitsp) 192 { 193 #ifdef WITH_OPENSSL 194 u_int maxbits, nid; 195 #endif 196 197 if (type == KEY_UNSPEC) 198 fatal("unknown key type %s", key_type_name); 199 if (*bitsp == 0) { 200 #ifdef WITH_OPENSSL 201 if (type == KEY_DSA) 202 *bitsp = DEFAULT_BITS_DSA; 203 else if (type == KEY_ECDSA) { 204 if (name != NULL && 205 (nid = sshkey_ecdsa_nid_from_name(name)) > 0) 206 *bitsp = sshkey_curve_nid_to_bits(nid); 207 if (*bitsp == 0) 208 *bitsp = DEFAULT_BITS_ECDSA; 209 } else 210 #endif 211 *bitsp = DEFAULT_BITS; 212 } 213 #ifdef WITH_OPENSSL 214 maxbits = (type == KEY_DSA) ? 215 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 216 if (*bitsp > maxbits) 217 fatal("key bits exceeds maximum %d", maxbits); 218 if (type == KEY_DSA && *bitsp != 1024) 219 fatal("DSA keys must be 1024 bits"); 220 else if (type != KEY_ECDSA && type != KEY_ED25519 && *bitsp < 1024) 221 fatal("Key must at least be 1024 bits"); 222 else if (type == KEY_ECDSA && sshkey_ecdsa_bits_to_nid(*bitsp) == -1) 223 fatal("Invalid ECDSA key length - valid lengths are " 224 "256, 384 or 521 bits"); 225 #endif 226 } 227 228 static void 229 ask_filename(struct passwd *pw, const char *prompt) 230 { 231 char buf[1024]; 232 char *name = NULL; 233 234 if (key_type_name == NULL) 235 name = _PATH_SSH_CLIENT_ID_RSA; 236 else { 237 switch (sshkey_type_from_name(key_type_name)) { 238 case KEY_RSA1: 239 name = _PATH_SSH_CLIENT_IDENTITY; 240 break; 241 case KEY_DSA_CERT: 242 case KEY_DSA: 243 name = _PATH_SSH_CLIENT_ID_DSA; 244 break; 245 #ifdef OPENSSL_HAS_ECC 246 case KEY_ECDSA_CERT: 247 case KEY_ECDSA: 248 name = _PATH_SSH_CLIENT_ID_ECDSA; 249 break; 250 #endif 251 case KEY_RSA_CERT: 252 case KEY_RSA: 253 name = _PATH_SSH_CLIENT_ID_RSA; 254 break; 255 case KEY_ED25519: 256 case KEY_ED25519_CERT: 257 name = _PATH_SSH_CLIENT_ID_ED25519; 258 break; 259 default: 260 fatal("bad key type"); 261 } 262 } 263 snprintf(identity_file, sizeof(identity_file), 264 "%s/%s", pw->pw_dir, name); 265 printf("%s (%s): ", prompt, identity_file); 266 fflush(stdout); 267 if (fgets(buf, sizeof(buf), stdin) == NULL) 268 exit(1); 269 buf[strcspn(buf, "\n")] = '\0'; 270 if (strcmp(buf, "") != 0) 271 strlcpy(identity_file, buf, sizeof(identity_file)); 272 have_identity = 1; 273 } 274 275 static struct sshkey * 276 load_identity(char *filename) 277 { 278 char *pass; 279 struct sshkey *prv; 280 int r; 281 282 if ((r = sshkey_load_private(filename, "", &prv, NULL)) == 0) 283 return prv; 284 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 285 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 286 if (identity_passphrase) 287 pass = xstrdup(identity_passphrase); 288 else 289 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN); 290 r = sshkey_load_private(filename, pass, &prv, NULL); 291 explicit_bzero(pass, strlen(pass)); 292 free(pass); 293 if (r != 0) 294 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 295 return prv; 296 } 297 298 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 299 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 300 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 301 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 302 303 #ifdef WITH_OPENSSL 304 static void 305 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k) 306 { 307 size_t len; 308 u_char *blob; 309 char comment[61]; 310 int r; 311 312 if (k->type == KEY_RSA1) 313 fatal("version 1 keys are not supported"); 314 if ((r = sshkey_to_blob(k, &blob, &len)) != 0) 315 fatal("key_to_blob failed: %s", ssh_err(r)); 316 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 317 snprintf(comment, sizeof(comment), 318 "%u-bit %s, converted by %s@%s from OpenSSH", 319 sshkey_size(k), sshkey_type(k), 320 pw->pw_name, hostname); 321 322 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 323 fprintf(stdout, "Comment: \"%s\"\n", comment); 324 dump_base64(stdout, blob, len); 325 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 326 sshkey_free(k); 327 free(blob); 328 exit(0); 329 } 330 331 static void 332 do_convert_to_pkcs8(struct sshkey *k) 333 { 334 switch (sshkey_type_plain(k->type)) { 335 case KEY_RSA1: 336 case KEY_RSA: 337 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 338 fatal("PEM_write_RSA_PUBKEY failed"); 339 break; 340 case KEY_DSA: 341 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 342 fatal("PEM_write_DSA_PUBKEY failed"); 343 break; 344 #ifdef OPENSSL_HAS_ECC 345 case KEY_ECDSA: 346 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 347 fatal("PEM_write_EC_PUBKEY failed"); 348 break; 349 #endif 350 default: 351 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 352 } 353 exit(0); 354 } 355 356 static void 357 do_convert_to_pem(struct sshkey *k) 358 { 359 switch (sshkey_type_plain(k->type)) { 360 case KEY_RSA1: 361 case KEY_RSA: 362 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 363 fatal("PEM_write_RSAPublicKey failed"); 364 break; 365 #if notyet /* OpenSSH 0.9.8 lacks this function */ 366 case KEY_DSA: 367 if (!PEM_write_DSAPublicKey(stdout, k->dsa)) 368 fatal("PEM_write_DSAPublicKey failed"); 369 break; 370 #endif 371 /* XXX ECDSA? */ 372 default: 373 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 374 } 375 exit(0); 376 } 377 378 static void 379 do_convert_to(struct passwd *pw) 380 { 381 struct sshkey *k; 382 struct stat st; 383 int r; 384 385 if (!have_identity) 386 ask_filename(pw, "Enter file in which the key is"); 387 if (stat(identity_file, &st) < 0) 388 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 389 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0) 390 k = load_identity(identity_file); 391 switch (convert_format) { 392 case FMT_RFC4716: 393 do_convert_to_ssh2(pw, k); 394 break; 395 case FMT_PKCS8: 396 do_convert_to_pkcs8(k); 397 break; 398 case FMT_PEM: 399 do_convert_to_pem(k); 400 break; 401 default: 402 fatal("%s: unknown key format %d", __func__, convert_format); 403 } 404 exit(0); 405 } 406 407 /* 408 * This is almost exactly the bignum1 encoding, but with 32 bit for length 409 * instead of 16. 410 */ 411 static void 412 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value) 413 { 414 u_int bytes, bignum_bits; 415 int r; 416 417 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0) 418 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 419 bytes = (bignum_bits + 7) / 8; 420 if (sshbuf_len(b) < bytes) 421 fatal("%s: input buffer too small: need %d have %zu", 422 __func__, bytes, sshbuf_len(b)); 423 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL) 424 fatal("%s: BN_bin2bn failed", __func__); 425 if ((r = sshbuf_consume(b, bytes)) != 0) 426 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 427 } 428 429 static struct sshkey * 430 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 431 { 432 struct sshbuf *b; 433 struct sshkey *key = NULL; 434 char *type, *cipher; 435 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345"; 436 int r, rlen, ktype; 437 u_int magic, i1, i2, i3, i4; 438 size_t slen; 439 u_long e; 440 441 if ((b = sshbuf_from(blob, blen)) == NULL) 442 fatal("%s: sshbuf_from failed", __func__); 443 if ((r = sshbuf_get_u32(b, &magic)) != 0) 444 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 445 446 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 447 error("bad magic 0x%x != 0x%x", magic, 448 SSH_COM_PRIVATE_KEY_MAGIC); 449 sshbuf_free(b); 450 return NULL; 451 } 452 if ((r = sshbuf_get_u32(b, &i1)) != 0 || 453 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 454 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 || 455 (r = sshbuf_get_u32(b, &i2)) != 0 || 456 (r = sshbuf_get_u32(b, &i3)) != 0 || 457 (r = sshbuf_get_u32(b, &i4)) != 0) 458 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 459 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 460 if (strcmp(cipher, "none") != 0) { 461 error("unsupported cipher %s", cipher); 462 free(cipher); 463 sshbuf_free(b); 464 free(type); 465 return NULL; 466 } 467 free(cipher); 468 469 if (strstr(type, "dsa")) { 470 ktype = KEY_DSA; 471 } else if (strstr(type, "rsa")) { 472 ktype = KEY_RSA; 473 } else { 474 sshbuf_free(b); 475 free(type); 476 return NULL; 477 } 478 if ((key = sshkey_new_private(ktype)) == NULL) 479 fatal("key_new_private failed"); 480 free(type); 481 482 switch (key->type) { 483 case KEY_DSA: 484 buffer_get_bignum_bits(b, key->dsa->p); 485 buffer_get_bignum_bits(b, key->dsa->g); 486 buffer_get_bignum_bits(b, key->dsa->q); 487 buffer_get_bignum_bits(b, key->dsa->pub_key); 488 buffer_get_bignum_bits(b, key->dsa->priv_key); 489 break; 490 case KEY_RSA: 491 if ((r = sshbuf_get_u8(b, &e1)) != 0 || 492 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) || 493 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0)) 494 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 495 e = e1; 496 debug("e %lx", e); 497 if (e < 30) { 498 e <<= 8; 499 e += e2; 500 debug("e %lx", e); 501 e <<= 8; 502 e += e3; 503 debug("e %lx", e); 504 } 505 if (!BN_set_word(key->rsa->e, e)) { 506 sshbuf_free(b); 507 sshkey_free(key); 508 return NULL; 509 } 510 buffer_get_bignum_bits(b, key->rsa->d); 511 buffer_get_bignum_bits(b, key->rsa->n); 512 buffer_get_bignum_bits(b, key->rsa->iqmp); 513 buffer_get_bignum_bits(b, key->rsa->q); 514 buffer_get_bignum_bits(b, key->rsa->p); 515 if ((r = rsa_generate_additional_parameters(key->rsa)) != 0) 516 fatal("generate RSA parameters failed: %s", ssh_err(r)); 517 break; 518 } 519 rlen = sshbuf_len(b); 520 if (rlen != 0) 521 error("do_convert_private_ssh2_from_blob: " 522 "remaining bytes in key blob %d", rlen); 523 sshbuf_free(b); 524 525 /* try the key */ 526 if (sshkey_sign(key, &sig, &slen, data, sizeof(data), NULL, 0) != 0 || 527 sshkey_verify(key, sig, slen, data, sizeof(data), 0) != 0) { 528 sshkey_free(key); 529 free(sig); 530 return NULL; 531 } 532 free(sig); 533 return key; 534 } 535 536 static int 537 get_line(FILE *fp, char *line, size_t len) 538 { 539 int c; 540 size_t pos = 0; 541 542 line[0] = '\0'; 543 while ((c = fgetc(fp)) != EOF) { 544 if (pos >= len - 1) 545 fatal("input line too long."); 546 switch (c) { 547 case '\r': 548 c = fgetc(fp); 549 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) 550 fatal("unget: %s", strerror(errno)); 551 return pos; 552 case '\n': 553 return pos; 554 } 555 line[pos++] = c; 556 line[pos] = '\0'; 557 } 558 /* We reached EOF */ 559 return -1; 560 } 561 562 static void 563 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private) 564 { 565 int r, blen, escaped = 0; 566 u_int len; 567 char line[1024]; 568 u_char blob[8096]; 569 char encoded[8096]; 570 FILE *fp; 571 572 if ((fp = fopen(identity_file, "r")) == NULL) 573 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 574 encoded[0] = '\0'; 575 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 576 if (blen > 0 && line[blen - 1] == '\\') 577 escaped++; 578 if (strncmp(line, "----", 4) == 0 || 579 strstr(line, ": ") != NULL) { 580 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 581 *private = 1; 582 if (strstr(line, " END ") != NULL) { 583 break; 584 } 585 /* fprintf(stderr, "ignore: %s", line); */ 586 continue; 587 } 588 if (escaped) { 589 escaped--; 590 /* fprintf(stderr, "escaped: %s", line); */ 591 continue; 592 } 593 strlcat(encoded, line, sizeof(encoded)); 594 } 595 len = strlen(encoded); 596 if (((len % 4) == 3) && 597 (encoded[len-1] == '=') && 598 (encoded[len-2] == '=') && 599 (encoded[len-3] == '=')) 600 encoded[len-3] = '\0'; 601 blen = uudecode(encoded, blob, sizeof(blob)); 602 if (blen < 0) 603 fatal("uudecode failed."); 604 if (*private) 605 *k = do_convert_private_ssh2_from_blob(blob, blen); 606 else if ((r = sshkey_from_blob(blob, blen, k)) != 0) 607 fatal("decode blob failed: %s", ssh_err(r)); 608 fclose(fp); 609 } 610 611 static void 612 do_convert_from_pkcs8(struct sshkey **k, int *private) 613 { 614 EVP_PKEY *pubkey; 615 FILE *fp; 616 617 if ((fp = fopen(identity_file, "r")) == NULL) 618 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 619 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 620 fatal("%s: %s is not a recognised public key format", __func__, 621 identity_file); 622 } 623 fclose(fp); 624 switch (EVP_PKEY_type(pubkey->type)) { 625 case EVP_PKEY_RSA: 626 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 627 fatal("sshkey_new failed"); 628 (*k)->type = KEY_RSA; 629 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 630 break; 631 case EVP_PKEY_DSA: 632 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 633 fatal("sshkey_new failed"); 634 (*k)->type = KEY_DSA; 635 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 636 break; 637 #ifdef OPENSSL_HAS_ECC 638 case EVP_PKEY_EC: 639 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 640 fatal("sshkey_new failed"); 641 (*k)->type = KEY_ECDSA; 642 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 643 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa); 644 break; 645 #endif 646 default: 647 fatal("%s: unsupported pubkey type %d", __func__, 648 EVP_PKEY_type(pubkey->type)); 649 } 650 EVP_PKEY_free(pubkey); 651 return; 652 } 653 654 static void 655 do_convert_from_pem(struct sshkey **k, int *private) 656 { 657 FILE *fp; 658 RSA *rsa; 659 #ifdef notyet 660 DSA *dsa; 661 #endif 662 663 if ((fp = fopen(identity_file, "r")) == NULL) 664 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 665 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 666 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 667 fatal("sshkey_new failed"); 668 (*k)->type = KEY_RSA; 669 (*k)->rsa = rsa; 670 fclose(fp); 671 return; 672 } 673 #if notyet /* OpenSSH 0.9.8 lacks this function */ 674 rewind(fp); 675 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 676 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 677 fatal("sshkey_new failed"); 678 (*k)->type = KEY_DSA; 679 (*k)->dsa = dsa; 680 fclose(fp); 681 return; 682 } 683 /* XXX ECDSA */ 684 #endif 685 fatal("%s: unrecognised raw private key format", __func__); 686 } 687 688 static void 689 do_convert_from(struct passwd *pw) 690 { 691 struct sshkey *k = NULL; 692 int r, private = 0, ok = 0; 693 struct stat st; 694 695 if (!have_identity) 696 ask_filename(pw, "Enter file in which the key is"); 697 if (stat(identity_file, &st) < 0) 698 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 699 700 switch (convert_format) { 701 case FMT_RFC4716: 702 do_convert_from_ssh2(pw, &k, &private); 703 break; 704 case FMT_PKCS8: 705 do_convert_from_pkcs8(&k, &private); 706 break; 707 case FMT_PEM: 708 do_convert_from_pem(&k, &private); 709 break; 710 default: 711 fatal("%s: unknown key format %d", __func__, convert_format); 712 } 713 714 if (!private) { 715 if ((r = sshkey_write(k, stdout)) == 0) 716 ok = 1; 717 if (ok) 718 fprintf(stdout, "\n"); 719 } else { 720 switch (k->type) { 721 case KEY_DSA: 722 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 723 NULL, 0, NULL, NULL); 724 break; 725 #ifdef OPENSSL_HAS_ECC 726 case KEY_ECDSA: 727 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 728 NULL, 0, NULL, NULL); 729 break; 730 #endif 731 case KEY_RSA: 732 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 733 NULL, 0, NULL, NULL); 734 break; 735 default: 736 fatal("%s: unsupported key type %s", __func__, 737 sshkey_type(k)); 738 } 739 } 740 741 if (!ok) 742 fatal("key write failed"); 743 sshkey_free(k); 744 exit(0); 745 } 746 #endif 747 748 static void 749 do_print_public(struct passwd *pw) 750 { 751 struct sshkey *prv; 752 struct stat st; 753 int r; 754 755 if (!have_identity) 756 ask_filename(pw, "Enter file in which the key is"); 757 if (stat(identity_file, &st) < 0) 758 fatal("%s: %s", identity_file, strerror(errno)); 759 prv = load_identity(identity_file); 760 if ((r = sshkey_write(prv, stdout)) != 0) 761 error("key_write failed: %s", ssh_err(r)); 762 sshkey_free(prv); 763 fprintf(stdout, "\n"); 764 exit(0); 765 } 766 767 static void 768 do_download(struct passwd *pw) 769 { 770 #ifdef ENABLE_PKCS11 771 struct sshkey **keys = NULL; 772 int i, nkeys; 773 enum sshkey_fp_rep rep; 774 int fptype; 775 char *fp, *ra; 776 777 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 778 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 779 780 pkcs11_init(0); 781 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 782 if (nkeys <= 0) 783 fatal("cannot read public key from pkcs11"); 784 for (i = 0; i < nkeys; i++) { 785 if (print_fingerprint) { 786 fp = sshkey_fingerprint(keys[i], fptype, rep); 787 ra = sshkey_fingerprint(keys[i], fingerprint_hash, 788 SSH_FP_RANDOMART); 789 if (fp == NULL || ra == NULL) 790 fatal("%s: sshkey_fingerprint fail", __func__); 791 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]), 792 fp, sshkey_type(keys[i])); 793 if (log_level >= SYSLOG_LEVEL_VERBOSE) 794 printf("%s\n", ra); 795 free(ra); 796 free(fp); 797 } else { 798 (void) sshkey_write(keys[i], stdout); /* XXX check */ 799 fprintf(stdout, "\n"); 800 } 801 sshkey_free(keys[i]); 802 } 803 free(keys); 804 pkcs11_terminate(); 805 exit(0); 806 #else 807 fatal("no pkcs11 support"); 808 #endif /* ENABLE_PKCS11 */ 809 } 810 811 static struct sshkey * 812 try_read_key(char **cpp) 813 { 814 struct sshkey *ret; 815 int r; 816 817 if ((ret = sshkey_new(KEY_RSA1)) == NULL) 818 fatal("sshkey_new failed"); 819 /* Try RSA1 */ 820 if ((r = sshkey_read(ret, cpp)) == 0) 821 return ret; 822 /* Try modern */ 823 sshkey_free(ret); 824 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL) 825 fatal("sshkey_new failed"); 826 if ((r = sshkey_read(ret, cpp)) == 0) 827 return ret; 828 /* Not a key */ 829 sshkey_free(ret); 830 return NULL; 831 } 832 833 static void 834 fingerprint_one_key(const struct sshkey *public, const char *comment) 835 { 836 char *fp = NULL, *ra = NULL; 837 enum sshkey_fp_rep rep; 838 int fptype; 839 840 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 841 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 842 fp = sshkey_fingerprint(public, fptype, rep); 843 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART); 844 if (fp == NULL || ra == NULL) 845 fatal("%s: sshkey_fingerprint failed", __func__); 846 printf("%u %s %s (%s)\n", sshkey_size(public), fp, 847 comment ? comment : "no comment", sshkey_type(public)); 848 if (log_level >= SYSLOG_LEVEL_VERBOSE) 849 printf("%s\n", ra); 850 free(ra); 851 free(fp); 852 } 853 854 static void 855 fingerprint_private(const char *path) 856 { 857 struct stat st; 858 char *comment = NULL; 859 struct sshkey *public = NULL; 860 int r; 861 862 if (stat(identity_file, &st) < 0) 863 fatal("%s: %s", path, strerror(errno)); 864 if ((r = sshkey_load_public(path, &public, &comment)) != 0) { 865 debug("load public \"%s\": %s", path, ssh_err(r)); 866 if ((r = sshkey_load_private(path, NULL, 867 &public, &comment)) != 0) { 868 debug("load private \"%s\": %s", path, ssh_err(r)); 869 fatal("%s is not a key file.", path); 870 } 871 } 872 873 fingerprint_one_key(public, comment); 874 sshkey_free(public); 875 free(comment); 876 } 877 878 static void 879 do_fingerprint(struct passwd *pw) 880 { 881 FILE *f; 882 struct sshkey *public = NULL; 883 char *comment = NULL, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES]; 884 int i, invalid = 1; 885 const char *path; 886 u_long lnum = 0; 887 888 if (!have_identity) 889 ask_filename(pw, "Enter file in which the key is"); 890 path = identity_file; 891 892 if (strcmp(identity_file, "-") == 0) { 893 f = stdin; 894 path = "(stdin)"; 895 } else if ((f = fopen(path, "r")) == NULL) 896 fatal("%s: %s: %s", __progname, path, strerror(errno)); 897 898 while (read_keyfile_line(f, path, line, sizeof(line), &lnum) == 0) { 899 cp = line; 900 cp[strcspn(cp, "\n")] = '\0'; 901 /* Trim leading space and comments */ 902 cp = line + strspn(line, " \t"); 903 if (*cp == '#' || *cp == '\0') 904 continue; 905 906 /* 907 * Input may be plain keys, private keys, authorized_keys 908 * or known_hosts. 909 */ 910 911 /* 912 * Try private keys first. Assume a key is private if 913 * "SSH PRIVATE KEY" appears on the first line and we're 914 * not reading from stdin (XXX support private keys on stdin). 915 */ 916 if (lnum == 1 && strcmp(identity_file, "-") != 0 && 917 strstr(cp, "PRIVATE KEY") != NULL) { 918 fclose(f); 919 fingerprint_private(path); 920 exit(0); 921 } 922 923 /* 924 * If it's not a private key, then this must be prepared to 925 * accept a public key prefixed with a hostname or options. 926 * Try a bare key first, otherwise skip the leading stuff. 927 */ 928 if ((public = try_read_key(&cp)) == NULL) { 929 i = strtol(cp, &ep, 10); 930 if (i == 0 || ep == NULL || 931 (*ep != ' ' && *ep != '\t')) { 932 int quoted = 0; 933 934 comment = cp; 935 for (; *cp && (quoted || (*cp != ' ' && 936 *cp != '\t')); cp++) { 937 if (*cp == '\\' && cp[1] == '"') 938 cp++; /* Skip both */ 939 else if (*cp == '"') 940 quoted = !quoted; 941 } 942 if (!*cp) 943 continue; 944 *cp++ = '\0'; 945 } 946 } 947 /* Retry after parsing leading hostname/key options */ 948 if (public == NULL && (public = try_read_key(&cp)) == NULL) { 949 debug("%s:%lu: not a public key", path, lnum); 950 continue; 951 } 952 953 /* Find trailing comment, if any */ 954 for (; *cp == ' ' || *cp == '\t'; cp++) 955 ; 956 if (*cp != '\0' && *cp != '#') 957 comment = cp; 958 959 fingerprint_one_key(public, comment); 960 sshkey_free(public); 961 invalid = 0; /* One good key in the file is sufficient */ 962 } 963 fclose(f); 964 965 if (invalid) 966 fatal("%s is not a public key file.", path); 967 exit(0); 968 } 969 970 static void 971 do_gen_all_hostkeys(struct passwd *pw) 972 { 973 struct { 974 char *key_type; 975 char *key_type_display; 976 char *path; 977 } key_types[] = { 978 #ifdef WITH_OPENSSL 979 #ifdef WITH_SSH1 980 { "rsa1", "RSA1", _PATH_HOST_KEY_FILE }, 981 #endif /* WITH_SSH1 */ 982 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 983 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 984 #ifdef OPENSSL_HAS_ECC 985 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 986 #endif /* OPENSSL_HAS_ECC */ 987 #endif /* WITH_OPENSSL */ 988 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE }, 989 { NULL, NULL, NULL } 990 }; 991 992 int first = 0; 993 struct stat st; 994 struct sshkey *private, *public; 995 char comment[1024]; 996 int i, type, fd, r; 997 FILE *f; 998 999 for (i = 0; key_types[i].key_type; i++) { 1000 if (stat(key_types[i].path, &st) == 0) 1001 continue; 1002 if (errno != ENOENT) { 1003 error("Could not stat %s: %s", key_types[i].path, 1004 strerror(errno)); 1005 first = 0; 1006 continue; 1007 } 1008 1009 if (first == 0) { 1010 first = 1; 1011 printf("%s: generating new host keys: ", __progname); 1012 } 1013 printf("%s ", key_types[i].key_type_display); 1014 fflush(stdout); 1015 type = sshkey_type_from_name(key_types[i].key_type); 1016 strlcpy(identity_file, key_types[i].path, sizeof(identity_file)); 1017 bits = 0; 1018 type_bits_valid(type, NULL, &bits); 1019 if ((r = sshkey_generate(type, bits, &private)) != 0) { 1020 error("key_generate failed: %s", ssh_err(r)); 1021 first = 0; 1022 continue; 1023 } 1024 if ((r = sshkey_from_private(private, &public)) != 0) 1025 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1026 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 1027 hostname); 1028 if ((r = sshkey_save_private(private, identity_file, "", 1029 comment, use_new_format, new_format_cipher, rounds)) != 0) { 1030 error("Saving key \"%s\" failed: %s", 1031 identity_file, ssh_err(r)); 1032 sshkey_free(private); 1033 sshkey_free(public); 1034 first = 0; 1035 continue; 1036 } 1037 sshkey_free(private); 1038 strlcat(identity_file, ".pub", sizeof(identity_file)); 1039 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1040 if (fd == -1) { 1041 error("Could not save your public key in %s", 1042 identity_file); 1043 sshkey_free(public); 1044 first = 0; 1045 continue; 1046 } 1047 f = fdopen(fd, "w"); 1048 if (f == NULL) { 1049 error("fdopen %s failed", identity_file); 1050 close(fd); 1051 sshkey_free(public); 1052 first = 0; 1053 continue; 1054 } 1055 if ((r = sshkey_write(public, f)) != 0) { 1056 error("write key failed: %s", ssh_err(r)); 1057 fclose(f); 1058 sshkey_free(public); 1059 first = 0; 1060 continue; 1061 } 1062 fprintf(f, " %s\n", comment); 1063 fclose(f); 1064 sshkey_free(public); 1065 1066 } 1067 if (first != 0) 1068 printf("\n"); 1069 } 1070 1071 struct known_hosts_ctx { 1072 const char *host; /* Hostname searched for in find/delete case */ 1073 FILE *out; /* Output file, stdout for find_hosts case */ 1074 int has_unhashed; /* When hashing, original had unhashed hosts */ 1075 int found_key; /* For find/delete, host was found */ 1076 int invalid; /* File contained invalid items; don't delete */ 1077 }; 1078 1079 static int 1080 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx) 1081 { 1082 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1083 char *hashed, *cp, *hosts, *ohosts; 1084 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts); 1085 1086 switch (l->status) { 1087 case HKF_STATUS_OK: 1088 case HKF_STATUS_MATCHED: 1089 /* 1090 * Don't hash hosts already already hashed, with wildcard 1091 * characters or a CA/revocation marker. 1092 */ 1093 if ((l->match & HKF_MATCH_HOST_HASHED) != 0 || 1094 has_wild || l->marker != MRK_NONE) { 1095 fprintf(ctx->out, "%s\n", l->line); 1096 if (has_wild && !find_host) { 1097 logit("%s:%ld: ignoring host name " 1098 "with wildcard: %.64s", l->path, 1099 l->linenum, l->hosts); 1100 } 1101 return 0; 1102 } 1103 /* 1104 * Split any comma-separated hostnames from the host list, 1105 * hash and store separately. 1106 */ 1107 ohosts = hosts = xstrdup(l->hosts); 1108 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') { 1109 if ((hashed = host_hash(cp, NULL, 0)) == NULL) 1110 fatal("hash_host failed"); 1111 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey); 1112 ctx->has_unhashed = 1; 1113 } 1114 free(ohosts); 1115 return 0; 1116 case HKF_STATUS_INVALID: 1117 /* Retain invalid lines, but mark file as invalid. */ 1118 ctx->invalid = 1; 1119 logit("%s:%ld: invalid line", l->path, l->linenum); 1120 /* FALLTHROUGH */ 1121 default: 1122 fprintf(ctx->out, "%s\n", l->line); 1123 return 0; 1124 } 1125 /* NOTREACHED */ 1126 return -1; 1127 } 1128 1129 static int 1130 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx) 1131 { 1132 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1133 enum sshkey_fp_rep rep; 1134 int fptype; 1135 char *fp; 1136 1137 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 1138 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 1139 1140 if (l->status == HKF_STATUS_MATCHED) { 1141 if (delete_host) { 1142 if (l->marker != MRK_NONE) { 1143 /* Don't remove CA and revocation lines */ 1144 fprintf(ctx->out, "%s\n", l->line); 1145 } else { 1146 /* 1147 * Hostname matches and has no CA/revoke 1148 * marker, delete it by *not* writing the 1149 * line to ctx->out. 1150 */ 1151 ctx->found_key = 1; 1152 if (!quiet) 1153 printf("# Host %s found: line %ld\n", 1154 ctx->host, l->linenum); 1155 } 1156 return 0; 1157 } else if (find_host) { 1158 ctx->found_key = 1; 1159 if (!quiet) { 1160 printf("# Host %s found: line %ld %s\n", 1161 ctx->host, 1162 l->linenum, l->marker == MRK_CA ? "CA" : 1163 (l->marker == MRK_REVOKE ? "REVOKED" : "")); 1164 } 1165 if (hash_hosts) 1166 known_hosts_hash(l, ctx); 1167 else if (print_fingerprint) { 1168 fp = sshkey_fingerprint(l->key, fptype, rep); 1169 printf("%s %s %s %s\n", ctx->host, 1170 sshkey_type(l->key), fp, l->comment); 1171 free(fp); 1172 } else 1173 fprintf(ctx->out, "%s\n", l->line); 1174 return 0; 1175 } 1176 } else if (delete_host) { 1177 /* Retain non-matching hosts when deleting */ 1178 if (l->status == HKF_STATUS_INVALID) { 1179 ctx->invalid = 1; 1180 logit("%s:%ld: invalid line", l->path, l->linenum); 1181 } 1182 fprintf(ctx->out, "%s\n", l->line); 1183 } 1184 return 0; 1185 } 1186 1187 static void 1188 do_known_hosts(struct passwd *pw, const char *name) 1189 { 1190 char *cp, tmp[PATH_MAX], old[PATH_MAX]; 1191 int r, fd, oerrno, inplace = 0; 1192 struct known_hosts_ctx ctx; 1193 u_int foreach_options; 1194 1195 if (!have_identity) { 1196 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1197 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1198 sizeof(identity_file)) 1199 fatal("Specified known hosts path too long"); 1200 free(cp); 1201 have_identity = 1; 1202 } 1203 1204 memset(&ctx, 0, sizeof(ctx)); 1205 ctx.out = stdout; 1206 ctx.host = name; 1207 1208 /* 1209 * Find hosts goes to stdout, hash and deletions happen in-place 1210 * A corner case is ssh-keygen -HF foo, which should go to stdout 1211 */ 1212 if (!find_host && (hash_hosts || delete_host)) { 1213 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1214 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1215 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1216 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1217 fatal("known_hosts path too long"); 1218 umask(077); 1219 if ((fd = mkstemp(tmp)) == -1) 1220 fatal("mkstemp: %s", strerror(errno)); 1221 if ((ctx.out = fdopen(fd, "w")) == NULL) { 1222 oerrno = errno; 1223 unlink(tmp); 1224 fatal("fdopen: %s", strerror(oerrno)); 1225 } 1226 inplace = 1; 1227 } 1228 1229 /* XXX support identity_file == "-" for stdin */ 1230 foreach_options = find_host ? HKF_WANT_MATCH : 0; 1231 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0; 1232 if ((r = hostkeys_foreach(identity_file, 1233 hash_hosts ? known_hosts_hash : known_hosts_find_delete, &ctx, 1234 name, NULL, foreach_options)) != 0) { 1235 if (inplace) 1236 unlink(tmp); 1237 fatal("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r)); 1238 } 1239 1240 if (inplace) 1241 fclose(ctx.out); 1242 1243 if (ctx.invalid) { 1244 error("%s is not a valid known_hosts file.", identity_file); 1245 if (inplace) { 1246 error("Not replacing existing known_hosts " 1247 "file because of errors"); 1248 unlink(tmp); 1249 } 1250 exit(1); 1251 } else if (delete_host && !ctx.found_key) { 1252 logit("Host %s not found in %s", name, identity_file); 1253 if (inplace) 1254 unlink(tmp); 1255 } else if (inplace) { 1256 /* Backup existing file */ 1257 if (unlink(old) == -1 && errno != ENOENT) 1258 fatal("unlink %.100s: %s", old, strerror(errno)); 1259 if (link(identity_file, old) == -1) 1260 fatal("link %.100s to %.100s: %s", identity_file, old, 1261 strerror(errno)); 1262 /* Move new one into place */ 1263 if (rename(tmp, identity_file) == -1) { 1264 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1265 strerror(errno)); 1266 unlink(tmp); 1267 unlink(old); 1268 exit(1); 1269 } 1270 1271 printf("%s updated.\n", identity_file); 1272 printf("Original contents retained as %s\n", old); 1273 if (ctx.has_unhashed) { 1274 logit("WARNING: %s contains unhashed entries", old); 1275 logit("Delete this file to ensure privacy " 1276 "of hostnames"); 1277 } 1278 } 1279 1280 exit (find_host && !ctx.found_key); 1281 } 1282 1283 /* 1284 * Perform changing a passphrase. The argument is the passwd structure 1285 * for the current user. 1286 */ 1287 static void 1288 do_change_passphrase(struct passwd *pw) 1289 { 1290 char *comment; 1291 char *old_passphrase, *passphrase1, *passphrase2; 1292 struct stat st; 1293 struct sshkey *private; 1294 int r; 1295 1296 if (!have_identity) 1297 ask_filename(pw, "Enter file in which the key is"); 1298 if (stat(identity_file, &st) < 0) 1299 fatal("%s: %s", identity_file, strerror(errno)); 1300 /* Try to load the file with empty passphrase. */ 1301 r = sshkey_load_private(identity_file, "", &private, &comment); 1302 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) { 1303 if (identity_passphrase) 1304 old_passphrase = xstrdup(identity_passphrase); 1305 else 1306 old_passphrase = 1307 read_passphrase("Enter old passphrase: ", 1308 RP_ALLOW_STDIN); 1309 r = sshkey_load_private(identity_file, old_passphrase, 1310 &private, &comment); 1311 explicit_bzero(old_passphrase, strlen(old_passphrase)); 1312 free(old_passphrase); 1313 if (r != 0) 1314 goto badkey; 1315 } else if (r != 0) { 1316 badkey: 1317 fatal("Failed to load key %s: %s", identity_file, ssh_err(r)); 1318 } 1319 if (comment) 1320 printf("Key has comment '%s'\n", comment); 1321 1322 /* Ask the new passphrase (twice). */ 1323 if (identity_new_passphrase) { 1324 passphrase1 = xstrdup(identity_new_passphrase); 1325 passphrase2 = NULL; 1326 } else { 1327 passphrase1 = 1328 read_passphrase("Enter new passphrase (empty for no " 1329 "passphrase): ", RP_ALLOW_STDIN); 1330 passphrase2 = read_passphrase("Enter same passphrase again: ", 1331 RP_ALLOW_STDIN); 1332 1333 /* Verify that they are the same. */ 1334 if (strcmp(passphrase1, passphrase2) != 0) { 1335 explicit_bzero(passphrase1, strlen(passphrase1)); 1336 explicit_bzero(passphrase2, strlen(passphrase2)); 1337 free(passphrase1); 1338 free(passphrase2); 1339 printf("Pass phrases do not match. Try again.\n"); 1340 exit(1); 1341 } 1342 /* Destroy the other copy. */ 1343 explicit_bzero(passphrase2, strlen(passphrase2)); 1344 free(passphrase2); 1345 } 1346 1347 /* Save the file using the new passphrase. */ 1348 if ((r = sshkey_save_private(private, identity_file, passphrase1, 1349 comment, use_new_format, new_format_cipher, rounds)) != 0) { 1350 error("Saving key \"%s\" failed: %s.", 1351 identity_file, ssh_err(r)); 1352 explicit_bzero(passphrase1, strlen(passphrase1)); 1353 free(passphrase1); 1354 sshkey_free(private); 1355 free(comment); 1356 exit(1); 1357 } 1358 /* Destroy the passphrase and the copy of the key in memory. */ 1359 explicit_bzero(passphrase1, strlen(passphrase1)); 1360 free(passphrase1); 1361 sshkey_free(private); /* Destroys contents */ 1362 free(comment); 1363 1364 printf("Your identification has been saved with the new passphrase.\n"); 1365 exit(0); 1366 } 1367 1368 /* 1369 * Print the SSHFP RR. 1370 */ 1371 static int 1372 do_print_resource_record(struct passwd *pw, char *fname, char *hname) 1373 { 1374 struct sshkey *public; 1375 char *comment = NULL; 1376 struct stat st; 1377 int r; 1378 1379 if (fname == NULL) 1380 fatal("%s: no filename", __func__); 1381 if (stat(fname, &st) < 0) { 1382 if (errno == ENOENT) 1383 return 0; 1384 fatal("%s: %s", fname, strerror(errno)); 1385 } 1386 if ((r = sshkey_load_public(fname, &public, &comment)) != 0) 1387 fatal("Failed to read v2 public key from \"%s\": %s.", 1388 fname, ssh_err(r)); 1389 export_dns_rr(hname, public, stdout, print_generic); 1390 sshkey_free(public); 1391 free(comment); 1392 return 1; 1393 } 1394 1395 /* 1396 * Change the comment of a private key file. 1397 */ 1398 static void 1399 do_change_comment(struct passwd *pw) 1400 { 1401 char new_comment[1024], *comment, *passphrase; 1402 struct sshkey *private; 1403 struct sshkey *public; 1404 struct stat st; 1405 FILE *f; 1406 int r, fd; 1407 1408 if (!have_identity) 1409 ask_filename(pw, "Enter file in which the key is"); 1410 if (stat(identity_file, &st) < 0) 1411 fatal("%s: %s", identity_file, strerror(errno)); 1412 if ((r = sshkey_load_private(identity_file, "", 1413 &private, &comment)) == 0) 1414 passphrase = xstrdup(""); 1415 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 1416 fatal("Cannot load private key \"%s\": %s.", 1417 identity_file, ssh_err(r)); 1418 else { 1419 if (identity_passphrase) 1420 passphrase = xstrdup(identity_passphrase); 1421 else if (identity_new_passphrase) 1422 passphrase = xstrdup(identity_new_passphrase); 1423 else 1424 passphrase = read_passphrase("Enter passphrase: ", 1425 RP_ALLOW_STDIN); 1426 /* Try to load using the passphrase. */ 1427 if ((r = sshkey_load_private(identity_file, passphrase, 1428 &private, &comment)) != 0) { 1429 explicit_bzero(passphrase, strlen(passphrase)); 1430 free(passphrase); 1431 fatal("Cannot load private key \"%s\": %s.", 1432 identity_file, ssh_err(r)); 1433 } 1434 } 1435 1436 if (private->type != KEY_RSA1 && private->type != KEY_ED25519 && 1437 !use_new_format) { 1438 error("Comments are only supported for RSA1 or keys stored in " 1439 "the new format (-o)."); 1440 explicit_bzero(passphrase, strlen(passphrase)); 1441 sshkey_free(private); 1442 exit(1); 1443 } 1444 printf("Key now has comment '%s'\n", comment); 1445 1446 if (identity_comment) { 1447 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1448 } else { 1449 printf("Enter new comment: "); 1450 fflush(stdout); 1451 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1452 explicit_bzero(passphrase, strlen(passphrase)); 1453 sshkey_free(private); 1454 exit(1); 1455 } 1456 new_comment[strcspn(new_comment, "\n")] = '\0'; 1457 } 1458 1459 /* Save the file using the new passphrase. */ 1460 if ((r = sshkey_save_private(private, identity_file, passphrase, 1461 new_comment, use_new_format, new_format_cipher, rounds)) != 0) { 1462 error("Saving key \"%s\" failed: %s", 1463 identity_file, ssh_err(r)); 1464 explicit_bzero(passphrase, strlen(passphrase)); 1465 free(passphrase); 1466 sshkey_free(private); 1467 free(comment); 1468 exit(1); 1469 } 1470 explicit_bzero(passphrase, strlen(passphrase)); 1471 free(passphrase); 1472 if ((r = sshkey_from_private(private, &public)) != 0) 1473 fatal("key_from_private failed: %s", ssh_err(r)); 1474 sshkey_free(private); 1475 1476 strlcat(identity_file, ".pub", sizeof(identity_file)); 1477 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1478 if (fd == -1) 1479 fatal("Could not save your public key in %s", identity_file); 1480 f = fdopen(fd, "w"); 1481 if (f == NULL) 1482 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 1483 if ((r = sshkey_write(public, f)) != 0) 1484 fatal("write key failed: %s", ssh_err(r)); 1485 sshkey_free(public); 1486 fprintf(f, " %s\n", new_comment); 1487 fclose(f); 1488 1489 free(comment); 1490 1491 printf("The comment in your key file has been changed.\n"); 1492 exit(0); 1493 } 1494 1495 static void 1496 add_flag_option(struct sshbuf *c, const char *name) 1497 { 1498 int r; 1499 1500 debug3("%s: %s", __func__, name); 1501 if ((r = sshbuf_put_cstring(c, name)) != 0 || 1502 (r = sshbuf_put_string(c, NULL, 0)) != 0) 1503 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1504 } 1505 1506 static void 1507 add_string_option(struct sshbuf *c, const char *name, const char *value) 1508 { 1509 struct sshbuf *b; 1510 int r; 1511 1512 debug3("%s: %s=%s", __func__, name, value); 1513 if ((b = sshbuf_new()) == NULL) 1514 fatal("%s: sshbuf_new failed", __func__); 1515 if ((r = sshbuf_put_cstring(b, value)) != 0 || 1516 (r = sshbuf_put_cstring(c, name)) != 0 || 1517 (r = sshbuf_put_stringb(c, b)) != 0) 1518 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1519 1520 sshbuf_free(b); 1521 } 1522 1523 #define OPTIONS_CRITICAL 1 1524 #define OPTIONS_EXTENSIONS 2 1525 static void 1526 prepare_options_buf(struct sshbuf *c, int which) 1527 { 1528 sshbuf_reset(c); 1529 if ((which & OPTIONS_CRITICAL) != 0 && 1530 certflags_command != NULL) 1531 add_string_option(c, "force-command", certflags_command); 1532 if ((which & OPTIONS_EXTENSIONS) != 0 && 1533 (certflags_flags & CERTOPT_X_FWD) != 0) 1534 add_flag_option(c, "permit-X11-forwarding"); 1535 if ((which & OPTIONS_EXTENSIONS) != 0 && 1536 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1537 add_flag_option(c, "permit-agent-forwarding"); 1538 if ((which & OPTIONS_EXTENSIONS) != 0 && 1539 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1540 add_flag_option(c, "permit-port-forwarding"); 1541 if ((which & OPTIONS_EXTENSIONS) != 0 && 1542 (certflags_flags & CERTOPT_PTY) != 0) 1543 add_flag_option(c, "permit-pty"); 1544 if ((which & OPTIONS_EXTENSIONS) != 0 && 1545 (certflags_flags & CERTOPT_USER_RC) != 0) 1546 add_flag_option(c, "permit-user-rc"); 1547 if ((which & OPTIONS_CRITICAL) != 0 && 1548 certflags_src_addr != NULL) 1549 add_string_option(c, "source-address", certflags_src_addr); 1550 } 1551 1552 static struct sshkey * 1553 load_pkcs11_key(char *path) 1554 { 1555 #ifdef ENABLE_PKCS11 1556 struct sshkey **keys = NULL, *public, *private = NULL; 1557 int r, i, nkeys; 1558 1559 if ((r = sshkey_load_public(path, &public, NULL)) != 0) 1560 fatal("Couldn't load CA public key \"%s\": %s", 1561 path, ssh_err(r)); 1562 1563 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1564 debug3("%s: %d keys", __func__, nkeys); 1565 if (nkeys <= 0) 1566 fatal("cannot read public key from pkcs11"); 1567 for (i = 0; i < nkeys; i++) { 1568 if (sshkey_equal_public(public, keys[i])) { 1569 private = keys[i]; 1570 continue; 1571 } 1572 sshkey_free(keys[i]); 1573 } 1574 free(keys); 1575 sshkey_free(public); 1576 return private; 1577 #else 1578 fatal("no pkcs11 support"); 1579 #endif /* ENABLE_PKCS11 */ 1580 } 1581 1582 static void 1583 do_ca_sign(struct passwd *pw, int argc, char **argv) 1584 { 1585 int r, i, fd; 1586 u_int n; 1587 struct sshkey *ca, *public; 1588 char valid[64], *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1589 FILE *f; 1590 1591 #ifdef ENABLE_PKCS11 1592 pkcs11_init(1); 1593 #endif 1594 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1595 if (pkcs11provider != NULL) { 1596 if ((ca = load_pkcs11_key(tmp)) == NULL) 1597 fatal("No PKCS#11 key matching %s found", ca_key_path); 1598 } else 1599 ca = load_identity(tmp); 1600 free(tmp); 1601 1602 if (key_type_name != NULL && 1603 sshkey_type_from_name(key_type_name) != ca->type) { 1604 fatal("CA key type %s doesn't match specified %s", 1605 sshkey_ssh_name(ca), key_type_name); 1606 } 1607 1608 for (i = 0; i < argc; i++) { 1609 /* Split list of principals */ 1610 n = 0; 1611 if (cert_principals != NULL) { 1612 otmp = tmp = xstrdup(cert_principals); 1613 plist = NULL; 1614 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1615 plist = xreallocarray(plist, n + 1, sizeof(*plist)); 1616 if (*(plist[n] = xstrdup(cp)) == '\0') 1617 fatal("Empty principal name"); 1618 } 1619 free(otmp); 1620 } 1621 1622 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1623 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0) 1624 fatal("%s: unable to open \"%s\": %s", 1625 __func__, tmp, ssh_err(r)); 1626 if (public->type != KEY_RSA && public->type != KEY_DSA && 1627 public->type != KEY_ECDSA && public->type != KEY_ED25519) 1628 fatal("%s: key \"%s\" type %s cannot be certified", 1629 __func__, tmp, sshkey_type(public)); 1630 1631 /* Prepare certificate to sign */ 1632 if ((r = sshkey_to_certified(public)) != 0) 1633 fatal("Could not upgrade key %s to certificate: %s", 1634 tmp, ssh_err(r)); 1635 public->cert->type = cert_key_type; 1636 public->cert->serial = (u_int64_t)cert_serial; 1637 public->cert->key_id = xstrdup(cert_key_id); 1638 public->cert->nprincipals = n; 1639 public->cert->principals = plist; 1640 public->cert->valid_after = cert_valid_from; 1641 public->cert->valid_before = cert_valid_to; 1642 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL); 1643 prepare_options_buf(public->cert->extensions, 1644 OPTIONS_EXTENSIONS); 1645 if ((r = sshkey_from_private(ca, 1646 &public->cert->signature_key)) != 0) 1647 fatal("key_from_private (ca key): %s", ssh_err(r)); 1648 1649 if ((r = sshkey_certify(public, ca, key_type_name)) != 0) 1650 fatal("Couldn't certify key %s: %s", tmp, ssh_err(r)); 1651 1652 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1653 *cp = '\0'; 1654 xasprintf(&out, "%s-cert.pub", tmp); 1655 free(tmp); 1656 1657 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1658 fatal("Could not open \"%s\" for writing: %s", out, 1659 strerror(errno)); 1660 if ((f = fdopen(fd, "w")) == NULL) 1661 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1662 if ((r = sshkey_write(public, f)) != 0) 1663 fatal("Could not write certified key to %s: %s", 1664 out, ssh_err(r)); 1665 fprintf(f, " %s\n", comment); 1666 fclose(f); 1667 1668 if (!quiet) { 1669 sshkey_format_cert_validity(public->cert, 1670 valid, sizeof(valid)); 1671 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1672 "valid %s", sshkey_cert_type(public), 1673 out, public->cert->key_id, 1674 (unsigned long long)public->cert->serial, 1675 cert_principals != NULL ? " for " : "", 1676 cert_principals != NULL ? cert_principals : "", 1677 valid); 1678 } 1679 1680 sshkey_free(public); 1681 free(out); 1682 } 1683 #ifdef ENABLE_PKCS11 1684 pkcs11_terminate(); 1685 #endif 1686 exit(0); 1687 } 1688 1689 static u_int64_t 1690 parse_relative_time(const char *s, time_t now) 1691 { 1692 int64_t mul, secs; 1693 1694 mul = *s == '-' ? -1 : 1; 1695 1696 if ((secs = convtime(s + 1)) == -1) 1697 fatal("Invalid relative certificate time %s", s); 1698 if (mul == -1 && secs > now) 1699 fatal("Certificate time %s cannot be represented", s); 1700 return now + (u_int64_t)(secs * mul); 1701 } 1702 1703 static u_int64_t 1704 parse_absolute_time(const char *s) 1705 { 1706 struct tm tm; 1707 time_t tt; 1708 char buf[32], *fmt; 1709 1710 /* 1711 * POSIX strptime says "The application shall ensure that there 1712 * is white-space or other non-alphanumeric characters between 1713 * any two conversion specifications" so arrange things this way. 1714 */ 1715 switch (strlen(s)) { 1716 case 8: 1717 fmt = "%Y-%m-%d"; 1718 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1719 break; 1720 case 14: 1721 fmt = "%Y-%m-%dT%H:%M:%S"; 1722 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1723 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1724 break; 1725 default: 1726 fatal("Invalid certificate time format %s", s); 1727 } 1728 1729 memset(&tm, 0, sizeof(tm)); 1730 if (strptime(buf, fmt, &tm) == NULL) 1731 fatal("Invalid certificate time %s", s); 1732 if ((tt = mktime(&tm)) < 0) 1733 fatal("Certificate time %s cannot be represented", s); 1734 return (u_int64_t)tt; 1735 } 1736 1737 static void 1738 parse_cert_times(char *timespec) 1739 { 1740 char *from, *to; 1741 time_t now = time(NULL); 1742 int64_t secs; 1743 1744 /* +timespec relative to now */ 1745 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1746 if ((secs = convtime(timespec + 1)) == -1) 1747 fatal("Invalid relative certificate life %s", timespec); 1748 cert_valid_to = now + secs; 1749 /* 1750 * Backdate certificate one minute to avoid problems on hosts 1751 * with poorly-synchronised clocks. 1752 */ 1753 cert_valid_from = ((now - 59)/ 60) * 60; 1754 return; 1755 } 1756 1757 /* 1758 * from:to, where 1759 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1760 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS 1761 */ 1762 from = xstrdup(timespec); 1763 to = strchr(from, ':'); 1764 if (to == NULL || from == to || *(to + 1) == '\0') 1765 fatal("Invalid certificate life specification %s", timespec); 1766 *to++ = '\0'; 1767 1768 if (*from == '-' || *from == '+') 1769 cert_valid_from = parse_relative_time(from, now); 1770 else 1771 cert_valid_from = parse_absolute_time(from); 1772 1773 if (*to == '-' || *to == '+') 1774 cert_valid_to = parse_relative_time(to, now); 1775 else 1776 cert_valid_to = parse_absolute_time(to); 1777 1778 if (cert_valid_to <= cert_valid_from) 1779 fatal("Empty certificate validity interval"); 1780 free(from); 1781 } 1782 1783 static void 1784 add_cert_option(char *opt) 1785 { 1786 char *val; 1787 1788 if (strcasecmp(opt, "clear") == 0) 1789 certflags_flags = 0; 1790 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1791 certflags_flags &= ~CERTOPT_X_FWD; 1792 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1793 certflags_flags |= CERTOPT_X_FWD; 1794 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1795 certflags_flags &= ~CERTOPT_AGENT_FWD; 1796 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1797 certflags_flags |= CERTOPT_AGENT_FWD; 1798 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1799 certflags_flags &= ~CERTOPT_PORT_FWD; 1800 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1801 certflags_flags |= CERTOPT_PORT_FWD; 1802 else if (strcasecmp(opt, "no-pty") == 0) 1803 certflags_flags &= ~CERTOPT_PTY; 1804 else if (strcasecmp(opt, "permit-pty") == 0) 1805 certflags_flags |= CERTOPT_PTY; 1806 else if (strcasecmp(opt, "no-user-rc") == 0) 1807 certflags_flags &= ~CERTOPT_USER_RC; 1808 else if (strcasecmp(opt, "permit-user-rc") == 0) 1809 certflags_flags |= CERTOPT_USER_RC; 1810 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1811 val = opt + 14; 1812 if (*val == '\0') 1813 fatal("Empty force-command option"); 1814 if (certflags_command != NULL) 1815 fatal("force-command already specified"); 1816 certflags_command = xstrdup(val); 1817 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1818 val = opt + 15; 1819 if (*val == '\0') 1820 fatal("Empty source-address option"); 1821 if (certflags_src_addr != NULL) 1822 fatal("source-address already specified"); 1823 if (addr_match_cidr_list(NULL, val) != 0) 1824 fatal("Invalid source-address list"); 1825 certflags_src_addr = xstrdup(val); 1826 } else 1827 fatal("Unsupported certificate option \"%s\"", opt); 1828 } 1829 1830 static void 1831 show_options(struct sshbuf *optbuf, int in_critical) 1832 { 1833 char *name, *arg; 1834 struct sshbuf *options, *option = NULL; 1835 int r; 1836 1837 if ((options = sshbuf_fromb(optbuf)) == NULL) 1838 fatal("%s: sshbuf_fromb failed", __func__); 1839 while (sshbuf_len(options) != 0) { 1840 sshbuf_free(option); 1841 option = NULL; 1842 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 || 1843 (r = sshbuf_froms(options, &option)) != 0) 1844 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1845 printf(" %s", name); 1846 if (!in_critical && 1847 (strcmp(name, "permit-X11-forwarding") == 0 || 1848 strcmp(name, "permit-agent-forwarding") == 0 || 1849 strcmp(name, "permit-port-forwarding") == 0 || 1850 strcmp(name, "permit-pty") == 0 || 1851 strcmp(name, "permit-user-rc") == 0)) 1852 printf("\n"); 1853 else if (in_critical && 1854 (strcmp(name, "force-command") == 0 || 1855 strcmp(name, "source-address") == 0)) { 1856 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0) 1857 fatal("%s: buffer error: %s", 1858 __func__, ssh_err(r)); 1859 printf(" %s\n", arg); 1860 free(arg); 1861 } else { 1862 printf(" UNKNOWN OPTION (len %zu)\n", 1863 sshbuf_len(option)); 1864 sshbuf_reset(option); 1865 } 1866 free(name); 1867 if (sshbuf_len(option) != 0) 1868 fatal("Option corrupt: extra data at end"); 1869 } 1870 sshbuf_free(option); 1871 sshbuf_free(options); 1872 } 1873 1874 static void 1875 print_cert(struct sshkey *key) 1876 { 1877 char valid[64], *key_fp, *ca_fp; 1878 u_int i; 1879 1880 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT); 1881 ca_fp = sshkey_fingerprint(key->cert->signature_key, 1882 fingerprint_hash, SSH_FP_DEFAULT); 1883 if (key_fp == NULL || ca_fp == NULL) 1884 fatal("%s: sshkey_fingerprint fail", __func__); 1885 sshkey_format_cert_validity(key->cert, valid, sizeof(valid)); 1886 1887 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key), 1888 sshkey_cert_type(key)); 1889 printf(" Public key: %s %s\n", sshkey_type(key), key_fp); 1890 printf(" Signing CA: %s %s\n", 1891 sshkey_type(key->cert->signature_key), ca_fp); 1892 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1893 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial); 1894 printf(" Valid: %s\n", valid); 1895 printf(" Principals: "); 1896 if (key->cert->nprincipals == 0) 1897 printf("(none)\n"); 1898 else { 1899 for (i = 0; i < key->cert->nprincipals; i++) 1900 printf("\n %s", 1901 key->cert->principals[i]); 1902 printf("\n"); 1903 } 1904 printf(" Critical Options: "); 1905 if (sshbuf_len(key->cert->critical) == 0) 1906 printf("(none)\n"); 1907 else { 1908 printf("\n"); 1909 show_options(key->cert->critical, 1); 1910 } 1911 printf(" Extensions: "); 1912 if (sshbuf_len(key->cert->extensions) == 0) 1913 printf("(none)\n"); 1914 else { 1915 printf("\n"); 1916 show_options(key->cert->extensions, 0); 1917 } 1918 } 1919 1920 static void 1921 do_show_cert(struct passwd *pw) 1922 { 1923 struct sshkey *key = NULL; 1924 struct stat st; 1925 int r, is_stdin = 0, ok = 0; 1926 FILE *f; 1927 char *cp, line[SSH_MAX_PUBKEY_BYTES]; 1928 const char *path; 1929 u_long lnum = 0; 1930 1931 if (!have_identity) 1932 ask_filename(pw, "Enter file in which the key is"); 1933 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) < 0) 1934 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 1935 1936 path = identity_file; 1937 if (strcmp(path, "-") == 0) { 1938 f = stdin; 1939 path = "(stdin)"; 1940 is_stdin = 1; 1941 } else if ((f = fopen(identity_file, "r")) == NULL) 1942 fatal("fopen %s: %s", identity_file, strerror(errno)); 1943 1944 while (read_keyfile_line(f, path, line, sizeof(line), &lnum) == 0) { 1945 sshkey_free(key); 1946 key = NULL; 1947 /* Trim leading space and comments */ 1948 cp = line + strspn(line, " \t"); 1949 if (*cp == '#' || *cp == '\0') 1950 continue; 1951 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 1952 fatal("key_new"); 1953 if ((r = sshkey_read(key, &cp)) != 0) { 1954 error("%s:%lu: invalid key: %s", path, 1955 lnum, ssh_err(r)); 1956 continue; 1957 } 1958 if (!sshkey_is_cert(key)) { 1959 error("%s:%lu is not a certificate", path, lnum); 1960 continue; 1961 } 1962 ok = 1; 1963 if (!is_stdin && lnum == 1) 1964 printf("%s:\n", path); 1965 else 1966 printf("%s:%lu:\n", path, lnum); 1967 print_cert(key); 1968 } 1969 sshkey_free(key); 1970 fclose(f); 1971 exit(ok ? 0 : 1); 1972 } 1973 1974 static void 1975 load_krl(const char *path, struct ssh_krl **krlp) 1976 { 1977 struct sshbuf *krlbuf; 1978 int r, fd; 1979 1980 if ((krlbuf = sshbuf_new()) == NULL) 1981 fatal("sshbuf_new failed"); 1982 if ((fd = open(path, O_RDONLY)) == -1) 1983 fatal("open %s: %s", path, strerror(errno)); 1984 if ((r = sshkey_load_file(fd, krlbuf)) != 0) 1985 fatal("Unable to load KRL: %s", ssh_err(r)); 1986 close(fd); 1987 /* XXX check sigs */ 1988 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 || 1989 *krlp == NULL) 1990 fatal("Invalid KRL file: %s", ssh_err(r)); 1991 sshbuf_free(krlbuf); 1992 } 1993 1994 static void 1995 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca, 1996 const struct sshkey *ca, struct ssh_krl *krl) 1997 { 1998 struct sshkey *key = NULL; 1999 u_long lnum = 0; 2000 char *path, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES]; 2001 unsigned long long serial, serial2; 2002 int i, was_explicit_key, was_sha1, r; 2003 FILE *krl_spec; 2004 2005 path = tilde_expand_filename(file, pw->pw_uid); 2006 if (strcmp(path, "-") == 0) { 2007 krl_spec = stdin; 2008 free(path); 2009 path = xstrdup("(standard input)"); 2010 } else if ((krl_spec = fopen(path, "r")) == NULL) 2011 fatal("fopen %s: %s", path, strerror(errno)); 2012 2013 if (!quiet) 2014 printf("Revoking from %s\n", path); 2015 while (read_keyfile_line(krl_spec, path, line, sizeof(line), 2016 &lnum) == 0) { 2017 was_explicit_key = was_sha1 = 0; 2018 cp = line + strspn(line, " \t"); 2019 /* Trim trailing space, comments and strip \n */ 2020 for (i = 0, r = -1; cp[i] != '\0'; i++) { 2021 if (cp[i] == '#' || cp[i] == '\n') { 2022 cp[i] = '\0'; 2023 break; 2024 } 2025 if (cp[i] == ' ' || cp[i] == '\t') { 2026 /* Remember the start of a span of whitespace */ 2027 if (r == -1) 2028 r = i; 2029 } else 2030 r = -1; 2031 } 2032 if (r != -1) 2033 cp[r] = '\0'; 2034 if (*cp == '\0') 2035 continue; 2036 if (strncasecmp(cp, "serial:", 7) == 0) { 2037 if (ca == NULL && !wild_ca) { 2038 fatal("revoking certificates by serial number " 2039 "requires specification of a CA key"); 2040 } 2041 cp += 7; 2042 cp = cp + strspn(cp, " \t"); 2043 errno = 0; 2044 serial = strtoull(cp, &ep, 0); 2045 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 2046 fatal("%s:%lu: invalid serial \"%s\"", 2047 path, lnum, cp); 2048 if (errno == ERANGE && serial == ULLONG_MAX) 2049 fatal("%s:%lu: serial out of range", 2050 path, lnum); 2051 serial2 = serial; 2052 if (*ep == '-') { 2053 cp = ep + 1; 2054 errno = 0; 2055 serial2 = strtoull(cp, &ep, 0); 2056 if (*cp == '\0' || *ep != '\0') 2057 fatal("%s:%lu: invalid serial \"%s\"", 2058 path, lnum, cp); 2059 if (errno == ERANGE && serial2 == ULLONG_MAX) 2060 fatal("%s:%lu: serial out of range", 2061 path, lnum); 2062 if (serial2 <= serial) 2063 fatal("%s:%lu: invalid serial range " 2064 "%llu:%llu", path, lnum, 2065 (unsigned long long)serial, 2066 (unsigned long long)serial2); 2067 } 2068 if (ssh_krl_revoke_cert_by_serial_range(krl, 2069 ca, serial, serial2) != 0) { 2070 fatal("%s: revoke serial failed", 2071 __func__); 2072 } 2073 } else if (strncasecmp(cp, "id:", 3) == 0) { 2074 if (ca == NULL && !wild_ca) { 2075 fatal("revoking certificates by key ID " 2076 "requires specification of a CA key"); 2077 } 2078 cp += 3; 2079 cp = cp + strspn(cp, " \t"); 2080 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2081 fatal("%s: revoke key ID failed", __func__); 2082 } else { 2083 if (strncasecmp(cp, "key:", 4) == 0) { 2084 cp += 4; 2085 cp = cp + strspn(cp, " \t"); 2086 was_explicit_key = 1; 2087 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2088 cp += 5; 2089 cp = cp + strspn(cp, " \t"); 2090 was_sha1 = 1; 2091 } else { 2092 /* 2093 * Just try to process the line as a key. 2094 * Parsing will fail if it isn't. 2095 */ 2096 } 2097 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2098 fatal("key_new"); 2099 if ((r = sshkey_read(key, &cp)) != 0) 2100 fatal("%s:%lu: invalid key: %s", 2101 path, lnum, ssh_err(r)); 2102 if (was_explicit_key) 2103 r = ssh_krl_revoke_key_explicit(krl, key); 2104 else if (was_sha1) 2105 r = ssh_krl_revoke_key_sha1(krl, key); 2106 else 2107 r = ssh_krl_revoke_key(krl, key); 2108 if (r != 0) 2109 fatal("%s: revoke key failed: %s", 2110 __func__, ssh_err(r)); 2111 sshkey_free(key); 2112 } 2113 } 2114 if (strcmp(path, "-") != 0) 2115 fclose(krl_spec); 2116 free(path); 2117 } 2118 2119 static void 2120 do_gen_krl(struct passwd *pw, int updating, int argc, char **argv) 2121 { 2122 struct ssh_krl *krl; 2123 struct stat sb; 2124 struct sshkey *ca = NULL; 2125 int fd, i, r, wild_ca = 0; 2126 char *tmp; 2127 struct sshbuf *kbuf; 2128 2129 if (*identity_file == '\0') 2130 fatal("KRL generation requires an output file"); 2131 if (stat(identity_file, &sb) == -1) { 2132 if (errno != ENOENT) 2133 fatal("Cannot access KRL \"%s\": %s", 2134 identity_file, strerror(errno)); 2135 if (updating) 2136 fatal("KRL \"%s\" does not exist", identity_file); 2137 } 2138 if (ca_key_path != NULL) { 2139 if (strcasecmp(ca_key_path, "none") == 0) 2140 wild_ca = 1; 2141 else { 2142 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2143 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 2144 fatal("Cannot load CA public key %s: %s", 2145 tmp, ssh_err(r)); 2146 free(tmp); 2147 } 2148 } 2149 2150 if (updating) 2151 load_krl(identity_file, &krl); 2152 else if ((krl = ssh_krl_init()) == NULL) 2153 fatal("couldn't create KRL"); 2154 2155 if (cert_serial != 0) 2156 ssh_krl_set_version(krl, cert_serial); 2157 if (identity_comment != NULL) 2158 ssh_krl_set_comment(krl, identity_comment); 2159 2160 for (i = 0; i < argc; i++) 2161 update_krl_from_file(pw, argv[i], wild_ca, ca, krl); 2162 2163 if ((kbuf = sshbuf_new()) == NULL) 2164 fatal("sshbuf_new failed"); 2165 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0) 2166 fatal("Couldn't generate KRL"); 2167 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2168 fatal("open %s: %s", identity_file, strerror(errno)); 2169 if (atomicio(vwrite, fd, (void *)sshbuf_ptr(kbuf), sshbuf_len(kbuf)) != 2170 sshbuf_len(kbuf)) 2171 fatal("write %s: %s", identity_file, strerror(errno)); 2172 close(fd); 2173 sshbuf_free(kbuf); 2174 ssh_krl_free(krl); 2175 sshkey_free(ca); 2176 } 2177 2178 static void 2179 do_check_krl(struct passwd *pw, int argc, char **argv) 2180 { 2181 int i, r, ret = 0; 2182 char *comment; 2183 struct ssh_krl *krl; 2184 struct sshkey *k; 2185 2186 if (*identity_file == '\0') 2187 fatal("KRL checking requires an input file"); 2188 load_krl(identity_file, &krl); 2189 for (i = 0; i < argc; i++) { 2190 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0) 2191 fatal("Cannot load public key %s: %s", 2192 argv[i], ssh_err(r)); 2193 r = ssh_krl_check_key(krl, k); 2194 printf("%s%s%s%s: %s\n", argv[i], 2195 *comment ? " (" : "", comment, *comment ? ")" : "", 2196 r == 0 ? "ok" : "REVOKED"); 2197 if (r != 0) 2198 ret = 1; 2199 sshkey_free(k); 2200 free(comment); 2201 } 2202 ssh_krl_free(krl); 2203 exit(ret); 2204 } 2205 2206 static void 2207 usage(void) 2208 { 2209 fprintf(stderr, 2210 "usage: ssh-keygen [-q] [-b bits] [-t dsa | ecdsa | ed25519 | rsa | rsa1]\n" 2211 " [-N new_passphrase] [-C comment] [-f output_keyfile]\n" 2212 " ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]\n" 2213 " ssh-keygen -i [-m key_format] [-f input_keyfile]\n" 2214 " ssh-keygen -e [-m key_format] [-f input_keyfile]\n" 2215 " ssh-keygen -y [-f input_keyfile]\n" 2216 " ssh-keygen -c [-P passphrase] [-C comment] [-f keyfile]\n" 2217 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n" 2218 " ssh-keygen -B [-f input_keyfile]\n"); 2219 #ifdef ENABLE_PKCS11 2220 fprintf(stderr, 2221 " ssh-keygen -D pkcs11\n"); 2222 #endif 2223 fprintf(stderr, 2224 " ssh-keygen -F hostname [-f known_hosts_file] [-l]\n" 2225 " ssh-keygen -H [-f known_hosts_file]\n" 2226 " ssh-keygen -R hostname [-f known_hosts_file]\n" 2227 " ssh-keygen -r hostname [-f input_keyfile] [-g]\n" 2228 #ifdef WITH_OPENSSL 2229 " ssh-keygen -G output_file [-v] [-b bits] [-M memory] [-S start_point]\n" 2230 " ssh-keygen -T output_file -f input_file [-v] [-a rounds] [-J num_lines]\n" 2231 " [-j start_line] [-K checkpt] [-W generator]\n" 2232 #endif 2233 " ssh-keygen -s ca_key -I certificate_identity [-h] [-n principals]\n" 2234 " [-O option] [-V validity_interval] [-z serial_number] file ...\n" 2235 " ssh-keygen -L [-f input_keyfile]\n" 2236 " ssh-keygen -A\n" 2237 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n" 2238 " file ...\n" 2239 " ssh-keygen -Q -f krl_file file ...\n"); 2240 exit(1); 2241 } 2242 2243 /* 2244 * Main program for key management. 2245 */ 2246 int 2247 main(int argc, char **argv) 2248 { 2249 char dotsshdir[PATH_MAX], comment[1024], *passphrase1, *passphrase2; 2250 char *rr_hostname = NULL, *ep, *fp, *ra; 2251 struct sshkey *private, *public; 2252 struct passwd *pw; 2253 struct stat st; 2254 int r, opt, type, fd; 2255 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 2256 FILE *f; 2257 const char *errstr; 2258 #ifdef WITH_OPENSSL 2259 /* Moduli generation/screening */ 2260 char out_file[PATH_MAX], *checkpoint = NULL; 2261 u_int32_t memory = 0, generator_wanted = 0; 2262 int do_gen_candidates = 0, do_screen_candidates = 0; 2263 unsigned long start_lineno = 0, lines_to_process = 0; 2264 BIGNUM *start = NULL; 2265 #endif 2266 2267 extern int optind; 2268 extern char *optarg; 2269 2270 ssh_malloc_init(); /* must be called before any mallocs */ 2271 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 2272 sanitise_stdfd(); 2273 2274 __progname = ssh_get_progname(argv[0]); 2275 2276 #ifdef WITH_OPENSSL 2277 OpenSSL_add_all_algorithms(); 2278 #endif 2279 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 2280 2281 seed_rng(); 2282 2283 /* we need this for the home * directory. */ 2284 pw = getpwuid(getuid()); 2285 if (!pw) 2286 fatal("No user exists for uid %lu", (u_long)getuid()); 2287 if (gethostname(hostname, sizeof(hostname)) < 0) 2288 fatal("gethostname: %s", strerror(errno)); 2289 2290 /* Remaining characters: UYdw */ 2291 while ((opt = getopt(argc, argv, "ABHLQXceghiklopquvxy" 2292 "C:D:E:F:G:I:J:K:M:N:O:P:R:S:T:V:W:Z:" 2293 "a:b:f:g:j:m:n:r:s:t:z:")) != -1) { 2294 switch (opt) { 2295 case 'A': 2296 gen_all_hostkeys = 1; 2297 break; 2298 case 'b': 2299 bits = (u_int32_t)strtonum(optarg, 256, 32768, &errstr); 2300 if (errstr) 2301 fatal("Bits has bad value %s (%s)", 2302 optarg, errstr); 2303 break; 2304 case 'E': 2305 fingerprint_hash = ssh_digest_alg_by_name(optarg); 2306 if (fingerprint_hash == -1) 2307 fatal("Invalid hash algorithm \"%s\"", optarg); 2308 break; 2309 case 'F': 2310 find_host = 1; 2311 rr_hostname = optarg; 2312 break; 2313 case 'H': 2314 hash_hosts = 1; 2315 break; 2316 case 'I': 2317 cert_key_id = optarg; 2318 break; 2319 case 'R': 2320 delete_host = 1; 2321 rr_hostname = optarg; 2322 break; 2323 case 'L': 2324 show_cert = 1; 2325 break; 2326 case 'l': 2327 print_fingerprint = 1; 2328 break; 2329 case 'B': 2330 print_bubblebabble = 1; 2331 break; 2332 case 'm': 2333 if (strcasecmp(optarg, "RFC4716") == 0 || 2334 strcasecmp(optarg, "ssh2") == 0) { 2335 convert_format = FMT_RFC4716; 2336 break; 2337 } 2338 if (strcasecmp(optarg, "PKCS8") == 0) { 2339 convert_format = FMT_PKCS8; 2340 break; 2341 } 2342 if (strcasecmp(optarg, "PEM") == 0) { 2343 convert_format = FMT_PEM; 2344 break; 2345 } 2346 fatal("Unsupported conversion format \"%s\"", optarg); 2347 case 'n': 2348 cert_principals = optarg; 2349 break; 2350 case 'o': 2351 use_new_format = 1; 2352 break; 2353 case 'p': 2354 change_passphrase = 1; 2355 break; 2356 case 'c': 2357 change_comment = 1; 2358 break; 2359 case 'f': 2360 if (strlcpy(identity_file, optarg, 2361 sizeof(identity_file)) >= sizeof(identity_file)) 2362 fatal("Identity filename too long"); 2363 have_identity = 1; 2364 break; 2365 case 'g': 2366 print_generic = 1; 2367 break; 2368 case 'P': 2369 identity_passphrase = optarg; 2370 break; 2371 case 'N': 2372 identity_new_passphrase = optarg; 2373 break; 2374 case 'Q': 2375 check_krl = 1; 2376 break; 2377 case 'O': 2378 add_cert_option(optarg); 2379 break; 2380 case 'Z': 2381 new_format_cipher = optarg; 2382 break; 2383 case 'C': 2384 identity_comment = optarg; 2385 break; 2386 case 'q': 2387 quiet = 1; 2388 break; 2389 case 'e': 2390 case 'x': 2391 /* export key */ 2392 convert_to = 1; 2393 break; 2394 case 'h': 2395 cert_key_type = SSH2_CERT_TYPE_HOST; 2396 certflags_flags = 0; 2397 break; 2398 case 'k': 2399 gen_krl = 1; 2400 break; 2401 case 'i': 2402 case 'X': 2403 /* import key */ 2404 convert_from = 1; 2405 break; 2406 case 'y': 2407 print_public = 1; 2408 break; 2409 case 's': 2410 ca_key_path = optarg; 2411 break; 2412 case 't': 2413 key_type_name = optarg; 2414 break; 2415 case 'D': 2416 pkcs11provider = optarg; 2417 break; 2418 case 'u': 2419 update_krl = 1; 2420 break; 2421 case 'v': 2422 if (log_level == SYSLOG_LEVEL_INFO) 2423 log_level = SYSLOG_LEVEL_DEBUG1; 2424 else { 2425 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2426 log_level < SYSLOG_LEVEL_DEBUG3) 2427 log_level++; 2428 } 2429 break; 2430 case 'r': 2431 rr_hostname = optarg; 2432 break; 2433 case 'a': 2434 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr); 2435 if (errstr) 2436 fatal("Invalid number: %s (%s)", 2437 optarg, errstr); 2438 break; 2439 case 'V': 2440 parse_cert_times(optarg); 2441 break; 2442 case 'z': 2443 errno = 0; 2444 cert_serial = strtoull(optarg, &ep, 10); 2445 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 2446 (errno == ERANGE && cert_serial == ULLONG_MAX)) 2447 fatal("Invalid serial number \"%s\"", optarg); 2448 break; 2449 #ifdef WITH_OPENSSL 2450 /* Moduli generation/screening */ 2451 case 'G': 2452 do_gen_candidates = 1; 2453 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2454 sizeof(out_file)) 2455 fatal("Output filename too long"); 2456 break; 2457 case 'J': 2458 lines_to_process = strtoul(optarg, NULL, 10); 2459 break; 2460 case 'j': 2461 start_lineno = strtoul(optarg, NULL, 10); 2462 break; 2463 case 'K': 2464 if (strlen(optarg) >= PATH_MAX) 2465 fatal("Checkpoint filename too long"); 2466 checkpoint = xstrdup(optarg); 2467 break; 2468 case 'M': 2469 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, 2470 &errstr); 2471 if (errstr) 2472 fatal("Memory limit is %s: %s", errstr, optarg); 2473 break; 2474 case 'S': 2475 /* XXX - also compare length against bits */ 2476 if (BN_hex2bn(&start, optarg) == 0) 2477 fatal("Invalid start point."); 2478 break; 2479 case 'T': 2480 do_screen_candidates = 1; 2481 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2482 sizeof(out_file)) 2483 fatal("Output filename too long"); 2484 break; 2485 case 'W': 2486 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2487 UINT_MAX, &errstr); 2488 if (errstr != NULL) 2489 fatal("Desired generator invalid: %s (%s)", 2490 optarg, errstr); 2491 break; 2492 #endif /* WITH_OPENSSL */ 2493 case '?': 2494 default: 2495 usage(); 2496 } 2497 } 2498 2499 /* reinit */ 2500 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2501 2502 argv += optind; 2503 argc -= optind; 2504 2505 if (ca_key_path != NULL) { 2506 if (argc < 1 && !gen_krl) { 2507 error("Too few arguments."); 2508 usage(); 2509 } 2510 } else if (argc > 0 && !gen_krl && !check_krl) { 2511 error("Too many arguments."); 2512 usage(); 2513 } 2514 if (change_passphrase && change_comment) { 2515 error("Can only have one of -p and -c."); 2516 usage(); 2517 } 2518 if (print_fingerprint && (delete_host || hash_hosts)) { 2519 error("Cannot use -l with -H or -R."); 2520 usage(); 2521 } 2522 if (gen_krl) { 2523 do_gen_krl(pw, update_krl, argc, argv); 2524 return (0); 2525 } 2526 if (check_krl) { 2527 do_check_krl(pw, argc, argv); 2528 return (0); 2529 } 2530 if (ca_key_path != NULL) { 2531 if (cert_key_id == NULL) 2532 fatal("Must specify key id (-I) when certifying"); 2533 do_ca_sign(pw, argc, argv); 2534 } 2535 if (show_cert) 2536 do_show_cert(pw); 2537 if (delete_host || hash_hosts || find_host) 2538 do_known_hosts(pw, rr_hostname); 2539 if (pkcs11provider != NULL) 2540 do_download(pw); 2541 if (print_fingerprint || print_bubblebabble) 2542 do_fingerprint(pw); 2543 if (change_passphrase) 2544 do_change_passphrase(pw); 2545 if (change_comment) 2546 do_change_comment(pw); 2547 #ifdef WITH_OPENSSL 2548 if (convert_to) 2549 do_convert_to(pw); 2550 if (convert_from) 2551 do_convert_from(pw); 2552 #endif 2553 if (print_public) 2554 do_print_public(pw); 2555 if (rr_hostname != NULL) { 2556 unsigned int n = 0; 2557 2558 if (have_identity) { 2559 n = do_print_resource_record(pw, 2560 identity_file, rr_hostname); 2561 if (n == 0) 2562 fatal("%s: %s", identity_file, strerror(errno)); 2563 exit(0); 2564 } else { 2565 2566 n += do_print_resource_record(pw, 2567 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2568 n += do_print_resource_record(pw, 2569 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2570 n += do_print_resource_record(pw, 2571 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname); 2572 n += do_print_resource_record(pw, 2573 _PATH_HOST_ED25519_KEY_FILE, rr_hostname); 2574 if (n == 0) 2575 fatal("no keys found."); 2576 exit(0); 2577 } 2578 } 2579 2580 #ifdef WITH_OPENSSL 2581 if (do_gen_candidates) { 2582 FILE *out = fopen(out_file, "w"); 2583 2584 if (out == NULL) { 2585 error("Couldn't open modulus candidate file \"%s\": %s", 2586 out_file, strerror(errno)); 2587 return (1); 2588 } 2589 if (bits == 0) 2590 bits = DEFAULT_BITS; 2591 if (gen_candidates(out, memory, bits, start) != 0) 2592 fatal("modulus candidate generation failed"); 2593 2594 return (0); 2595 } 2596 2597 if (do_screen_candidates) { 2598 FILE *in; 2599 FILE *out = fopen(out_file, "a"); 2600 2601 if (have_identity && strcmp(identity_file, "-") != 0) { 2602 if ((in = fopen(identity_file, "r")) == NULL) { 2603 fatal("Couldn't open modulus candidate " 2604 "file \"%s\": %s", identity_file, 2605 strerror(errno)); 2606 } 2607 } else 2608 in = stdin; 2609 2610 if (out == NULL) { 2611 fatal("Couldn't open moduli file \"%s\": %s", 2612 out_file, strerror(errno)); 2613 } 2614 if (prime_test(in, out, rounds == 0 ? 100 : rounds, 2615 generator_wanted, checkpoint, 2616 start_lineno, lines_to_process) != 0) 2617 fatal("modulus screening failed"); 2618 return (0); 2619 } 2620 #endif 2621 2622 if (gen_all_hostkeys) { 2623 do_gen_all_hostkeys(pw); 2624 return (0); 2625 } 2626 2627 if (key_type_name == NULL) 2628 key_type_name = DEFAULT_KEY_TYPE_NAME; 2629 2630 type = sshkey_type_from_name(key_type_name); 2631 type_bits_valid(type, key_type_name, &bits); 2632 2633 if (!quiet) 2634 printf("Generating public/private %s key pair.\n", 2635 key_type_name); 2636 if ((r = sshkey_generate(type, bits, &private)) != 0) 2637 fatal("key_generate failed"); 2638 if ((r = sshkey_from_private(private, &public)) != 0) 2639 fatal("key_from_private failed: %s\n", ssh_err(r)); 2640 2641 if (!have_identity) 2642 ask_filename(pw, "Enter file in which to save the key"); 2643 2644 /* Create ~/.ssh directory if it doesn't already exist. */ 2645 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2646 pw->pw_dir, _PATH_SSH_USER_DIR); 2647 if (strstr(identity_file, dotsshdir) != NULL) { 2648 if (stat(dotsshdir, &st) < 0) { 2649 if (errno != ENOENT) { 2650 error("Could not stat %s: %s", dotsshdir, 2651 strerror(errno)); 2652 } else if (mkdir(dotsshdir, 0700) < 0) { 2653 error("Could not create directory '%s': %s", 2654 dotsshdir, strerror(errno)); 2655 } else if (!quiet) 2656 printf("Created directory '%s'.\n", dotsshdir); 2657 } 2658 } 2659 /* If the file already exists, ask the user to confirm. */ 2660 if (stat(identity_file, &st) >= 0) { 2661 char yesno[3]; 2662 printf("%s already exists.\n", identity_file); 2663 printf("Overwrite (y/n)? "); 2664 fflush(stdout); 2665 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2666 exit(1); 2667 if (yesno[0] != 'y' && yesno[0] != 'Y') 2668 exit(1); 2669 } 2670 /* Ask for a passphrase (twice). */ 2671 if (identity_passphrase) 2672 passphrase1 = xstrdup(identity_passphrase); 2673 else if (identity_new_passphrase) 2674 passphrase1 = xstrdup(identity_new_passphrase); 2675 else { 2676 passphrase_again: 2677 passphrase1 = 2678 read_passphrase("Enter passphrase (empty for no " 2679 "passphrase): ", RP_ALLOW_STDIN); 2680 passphrase2 = read_passphrase("Enter same passphrase again: ", 2681 RP_ALLOW_STDIN); 2682 if (strcmp(passphrase1, passphrase2) != 0) { 2683 /* 2684 * The passphrases do not match. Clear them and 2685 * retry. 2686 */ 2687 explicit_bzero(passphrase1, strlen(passphrase1)); 2688 explicit_bzero(passphrase2, strlen(passphrase2)); 2689 free(passphrase1); 2690 free(passphrase2); 2691 printf("Passphrases do not match. Try again.\n"); 2692 goto passphrase_again; 2693 } 2694 /* Clear the other copy of the passphrase. */ 2695 explicit_bzero(passphrase2, strlen(passphrase2)); 2696 free(passphrase2); 2697 } 2698 2699 if (identity_comment) { 2700 strlcpy(comment, identity_comment, sizeof(comment)); 2701 } else { 2702 /* Create default comment field for the passphrase. */ 2703 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2704 } 2705 2706 /* Save the key with the given passphrase and comment. */ 2707 if ((r = sshkey_save_private(private, identity_file, passphrase1, 2708 comment, use_new_format, new_format_cipher, rounds)) != 0) { 2709 error("Saving key \"%s\" failed: %s", 2710 identity_file, ssh_err(r)); 2711 explicit_bzero(passphrase1, strlen(passphrase1)); 2712 free(passphrase1); 2713 exit(1); 2714 } 2715 /* Clear the passphrase. */ 2716 explicit_bzero(passphrase1, strlen(passphrase1)); 2717 free(passphrase1); 2718 2719 /* Clear the private key and the random number generator. */ 2720 sshkey_free(private); 2721 2722 if (!quiet) 2723 printf("Your identification has been saved in %s.\n", identity_file); 2724 2725 strlcat(identity_file, ".pub", sizeof(identity_file)); 2726 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2727 fatal("Unable to save public key to %s: %s", 2728 identity_file, strerror(errno)); 2729 if ((f = fdopen(fd, "w")) == NULL) 2730 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 2731 if ((r = sshkey_write(public, f)) != 0) 2732 error("write key failed: %s", ssh_err(r)); 2733 fprintf(f, " %s\n", comment); 2734 fclose(f); 2735 2736 if (!quiet) { 2737 fp = sshkey_fingerprint(public, fingerprint_hash, 2738 SSH_FP_DEFAULT); 2739 ra = sshkey_fingerprint(public, fingerprint_hash, 2740 SSH_FP_RANDOMART); 2741 if (fp == NULL || ra == NULL) 2742 fatal("sshkey_fingerprint failed"); 2743 printf("Your public key has been saved in %s.\n", 2744 identity_file); 2745 printf("The key fingerprint is:\n"); 2746 printf("%s %s\n", fp, comment); 2747 printf("The key's randomart image is:\n"); 2748 printf("%s\n", ra); 2749 free(ra); 2750 free(fp); 2751 } 2752 2753 sshkey_free(public); 2754 exit(0); 2755 } 2756