1 /* $OpenBSD: ssh-keygen.c,v 1.322 2018/09/14 04:17:44 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 #include <time.h> 42 43 #include "xmalloc.h" 44 #include "sshkey.h" 45 #include "authfile.h" 46 #include "uuencode.h" 47 #include "sshbuf.h" 48 #include "pathnames.h" 49 #include "log.h" 50 #include "misc.h" 51 #include "match.h" 52 #include "hostfile.h" 53 #include "dns.h" 54 #include "ssh.h" 55 #include "ssh2.h" 56 #include "ssherr.h" 57 #include "ssh-pkcs11.h" 58 #include "atomicio.h" 59 #include "krl.h" 60 #include "digest.h" 61 #include "utf8.h" 62 #include "authfd.h" 63 64 #ifdef WITH_OPENSSL 65 # define DEFAULT_KEY_TYPE_NAME "rsa" 66 #else 67 # define DEFAULT_KEY_TYPE_NAME "ed25519" 68 #endif 69 70 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */ 71 #define DEFAULT_BITS 2048 72 #define DEFAULT_BITS_DSA 1024 73 #define DEFAULT_BITS_ECDSA 256 74 u_int32_t bits = 0; 75 76 /* 77 * Flag indicating that we just want to change the passphrase. This can be 78 * set on the command line. 79 */ 80 int change_passphrase = 0; 81 82 /* 83 * Flag indicating that we just want to change the comment. This can be set 84 * on the command line. 85 */ 86 int change_comment = 0; 87 88 int quiet = 0; 89 90 int log_level = SYSLOG_LEVEL_INFO; 91 92 /* Flag indicating that we want to hash a known_hosts file */ 93 int hash_hosts = 0; 94 /* Flag indicating that we want lookup a host in known_hosts file */ 95 int find_host = 0; 96 /* Flag indicating that we want to delete a host from a known_hosts file */ 97 int delete_host = 0; 98 99 /* Flag indicating that we want to show the contents of a certificate */ 100 int show_cert = 0; 101 102 /* Flag indicating that we just want to see the key fingerprint */ 103 int print_fingerprint = 0; 104 int print_bubblebabble = 0; 105 106 /* Hash algorithm to use for fingerprints. */ 107 int fingerprint_hash = SSH_FP_HASH_DEFAULT; 108 109 /* The identity file name, given on the command line or entered by the user. */ 110 char identity_file[1024]; 111 int have_identity = 0; 112 113 /* This is set to the passphrase if given on the command line. */ 114 char *identity_passphrase = NULL; 115 116 /* This is set to the new passphrase if given on the command line. */ 117 char *identity_new_passphrase = NULL; 118 119 /* This is set to the new comment if given on the command line. */ 120 char *identity_comment = NULL; 121 122 /* Path to CA key when certifying keys. */ 123 char *ca_key_path = NULL; 124 125 /* Prefer to use agent keys for CA signing */ 126 int prefer_agent = 0; 127 128 /* Certificate serial number */ 129 unsigned long long cert_serial = 0; 130 131 /* Key type when certifying */ 132 u_int cert_key_type = SSH2_CERT_TYPE_USER; 133 134 /* "key ID" of signed key */ 135 char *cert_key_id = NULL; 136 137 /* Comma-separated list of principal names for certifying keys */ 138 char *cert_principals = NULL; 139 140 /* Validity period for certificates */ 141 u_int64_t cert_valid_from = 0; 142 u_int64_t cert_valid_to = ~0ULL; 143 144 /* Certificate options */ 145 #define CERTOPT_X_FWD (1) 146 #define CERTOPT_AGENT_FWD (1<<1) 147 #define CERTOPT_PORT_FWD (1<<2) 148 #define CERTOPT_PTY (1<<3) 149 #define CERTOPT_USER_RC (1<<4) 150 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 151 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 152 u_int32_t certflags_flags = CERTOPT_DEFAULT; 153 char *certflags_command = NULL; 154 char *certflags_src_addr = NULL; 155 156 /* Arbitrary extensions specified by user */ 157 struct cert_userext { 158 char *key; 159 char *val; 160 int crit; 161 }; 162 struct cert_userext *cert_userext; 163 size_t ncert_userext; 164 165 /* Conversion to/from various formats */ 166 int convert_to = 0; 167 int convert_from = 0; 168 enum { 169 FMT_RFC4716, 170 FMT_PKCS8, 171 FMT_PEM 172 } convert_format = FMT_RFC4716; 173 int print_public = 0; 174 int print_generic = 0; 175 176 char *key_type_name = NULL; 177 178 /* Load key from this PKCS#11 provider */ 179 char *pkcs11provider = NULL; 180 181 /* Use new OpenSSH private key format when writing SSH2 keys instead of PEM */ 182 int use_new_format = 1; 183 184 /* Cipher for new-format private keys */ 185 char *new_format_cipher = NULL; 186 187 /* 188 * Number of KDF rounds to derive new format keys / 189 * number of primality trials when screening moduli. 190 */ 191 int rounds = 0; 192 193 /* argv0 */ 194 extern char *__progname; 195 196 char hostname[NI_MAXHOST]; 197 198 #ifdef WITH_OPENSSL 199 /* moduli.c */ 200 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 201 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 202 unsigned long); 203 #endif 204 205 static void 206 type_bits_valid(int type, const char *name, u_int32_t *bitsp) 207 { 208 #ifdef WITH_OPENSSL 209 u_int maxbits, nid; 210 #endif 211 212 if (type == KEY_UNSPEC) 213 fatal("unknown key type %s", key_type_name); 214 if (*bitsp == 0) { 215 #ifdef WITH_OPENSSL 216 if (type == KEY_DSA) 217 *bitsp = DEFAULT_BITS_DSA; 218 else if (type == KEY_ECDSA) { 219 if (name != NULL && 220 (nid = sshkey_ecdsa_nid_from_name(name)) > 0) 221 *bitsp = sshkey_curve_nid_to_bits(nid); 222 if (*bitsp == 0) 223 *bitsp = DEFAULT_BITS_ECDSA; 224 } else 225 #endif 226 *bitsp = DEFAULT_BITS; 227 } 228 #ifdef WITH_OPENSSL 229 maxbits = (type == KEY_DSA) ? 230 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 231 if (*bitsp > maxbits) 232 fatal("key bits exceeds maximum %d", maxbits); 233 switch (type) { 234 case KEY_DSA: 235 if (*bitsp != 1024) 236 fatal("Invalid DSA key length: must be 1024 bits"); 237 break; 238 case KEY_RSA: 239 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE) 240 fatal("Invalid RSA key length: minimum is %d bits", 241 SSH_RSA_MINIMUM_MODULUS_SIZE); 242 break; 243 case KEY_ECDSA: 244 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1) 245 fatal("Invalid ECDSA key length: valid lengths are " 246 "256, 384 or 521 bits"); 247 } 248 #endif 249 } 250 251 static void 252 ask_filename(struct passwd *pw, const char *prompt) 253 { 254 char buf[1024]; 255 char *name = NULL; 256 257 if (key_type_name == NULL) 258 name = _PATH_SSH_CLIENT_ID_RSA; 259 else { 260 switch (sshkey_type_from_name(key_type_name)) { 261 case KEY_DSA_CERT: 262 case KEY_DSA: 263 name = _PATH_SSH_CLIENT_ID_DSA; 264 break; 265 #ifdef OPENSSL_HAS_ECC 266 case KEY_ECDSA_CERT: 267 case KEY_ECDSA: 268 name = _PATH_SSH_CLIENT_ID_ECDSA; 269 break; 270 #endif 271 case KEY_RSA_CERT: 272 case KEY_RSA: 273 name = _PATH_SSH_CLIENT_ID_RSA; 274 break; 275 case KEY_ED25519: 276 case KEY_ED25519_CERT: 277 name = _PATH_SSH_CLIENT_ID_ED25519; 278 break; 279 case KEY_XMSS: 280 case KEY_XMSS_CERT: 281 name = _PATH_SSH_CLIENT_ID_XMSS; 282 break; 283 default: 284 fatal("bad key type"); 285 } 286 } 287 snprintf(identity_file, sizeof(identity_file), 288 "%s/%s", pw->pw_dir, name); 289 printf("%s (%s): ", prompt, identity_file); 290 fflush(stdout); 291 if (fgets(buf, sizeof(buf), stdin) == NULL) 292 exit(1); 293 buf[strcspn(buf, "\n")] = '\0'; 294 if (strcmp(buf, "") != 0) 295 strlcpy(identity_file, buf, sizeof(identity_file)); 296 have_identity = 1; 297 } 298 299 static struct sshkey * 300 load_identity(char *filename) 301 { 302 char *pass; 303 struct sshkey *prv; 304 int r; 305 306 if ((r = sshkey_load_private(filename, "", &prv, NULL)) == 0) 307 return prv; 308 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 309 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 310 if (identity_passphrase) 311 pass = xstrdup(identity_passphrase); 312 else 313 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN); 314 r = sshkey_load_private(filename, pass, &prv, NULL); 315 explicit_bzero(pass, strlen(pass)); 316 free(pass); 317 if (r != 0) 318 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 319 return prv; 320 } 321 322 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 323 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 324 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 325 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 326 327 #ifdef WITH_OPENSSL 328 static void 329 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k) 330 { 331 size_t len; 332 u_char *blob; 333 char comment[61]; 334 int r; 335 336 if ((r = sshkey_to_blob(k, &blob, &len)) != 0) 337 fatal("key_to_blob failed: %s", ssh_err(r)); 338 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 339 snprintf(comment, sizeof(comment), 340 "%u-bit %s, converted by %s@%s from OpenSSH", 341 sshkey_size(k), sshkey_type(k), 342 pw->pw_name, hostname); 343 344 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 345 fprintf(stdout, "Comment: \"%s\"\n", comment); 346 dump_base64(stdout, blob, len); 347 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 348 sshkey_free(k); 349 free(blob); 350 exit(0); 351 } 352 353 static void 354 do_convert_to_pkcs8(struct sshkey *k) 355 { 356 switch (sshkey_type_plain(k->type)) { 357 case KEY_RSA: 358 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 359 fatal("PEM_write_RSA_PUBKEY failed"); 360 break; 361 case KEY_DSA: 362 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 363 fatal("PEM_write_DSA_PUBKEY failed"); 364 break; 365 #ifdef OPENSSL_HAS_ECC 366 case KEY_ECDSA: 367 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 368 fatal("PEM_write_EC_PUBKEY failed"); 369 break; 370 #endif 371 default: 372 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 373 } 374 exit(0); 375 } 376 377 static void 378 do_convert_to_pem(struct sshkey *k) 379 { 380 switch (sshkey_type_plain(k->type)) { 381 case KEY_RSA: 382 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 383 fatal("PEM_write_RSAPublicKey failed"); 384 break; 385 default: 386 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 387 } 388 exit(0); 389 } 390 391 static void 392 do_convert_to(struct passwd *pw) 393 { 394 struct sshkey *k; 395 struct stat st; 396 int r; 397 398 if (!have_identity) 399 ask_filename(pw, "Enter file in which the key is"); 400 if (stat(identity_file, &st) < 0) 401 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 402 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0) 403 k = load_identity(identity_file); 404 switch (convert_format) { 405 case FMT_RFC4716: 406 do_convert_to_ssh2(pw, k); 407 break; 408 case FMT_PKCS8: 409 do_convert_to_pkcs8(k); 410 break; 411 case FMT_PEM: 412 do_convert_to_pem(k); 413 break; 414 default: 415 fatal("%s: unknown key format %d", __func__, convert_format); 416 } 417 exit(0); 418 } 419 420 /* 421 * This is almost exactly the bignum1 encoding, but with 32 bit for length 422 * instead of 16. 423 */ 424 static void 425 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value) 426 { 427 u_int bytes, bignum_bits; 428 int r; 429 430 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0) 431 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 432 bytes = (bignum_bits + 7) / 8; 433 if (sshbuf_len(b) < bytes) 434 fatal("%s: input buffer too small: need %d have %zu", 435 __func__, bytes, sshbuf_len(b)); 436 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL) 437 fatal("%s: BN_bin2bn failed", __func__); 438 if ((r = sshbuf_consume(b, bytes)) != 0) 439 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 440 } 441 442 static struct sshkey * 443 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 444 { 445 struct sshbuf *b; 446 struct sshkey *key = NULL; 447 char *type, *cipher; 448 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345"; 449 int r, rlen, ktype; 450 u_int magic, i1, i2, i3, i4; 451 size_t slen; 452 u_long e; 453 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL; 454 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL; 455 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL; 456 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL; 457 if ((b = sshbuf_from(blob, blen)) == NULL) 458 fatal("%s: sshbuf_from failed", __func__); 459 if ((r = sshbuf_get_u32(b, &magic)) != 0) 460 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 461 462 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 463 error("bad magic 0x%x != 0x%x", magic, 464 SSH_COM_PRIVATE_KEY_MAGIC); 465 sshbuf_free(b); 466 return NULL; 467 } 468 if ((r = sshbuf_get_u32(b, &i1)) != 0 || 469 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 470 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 || 471 (r = sshbuf_get_u32(b, &i2)) != 0 || 472 (r = sshbuf_get_u32(b, &i3)) != 0 || 473 (r = sshbuf_get_u32(b, &i4)) != 0) 474 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 475 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 476 if (strcmp(cipher, "none") != 0) { 477 error("unsupported cipher %s", cipher); 478 free(cipher); 479 sshbuf_free(b); 480 free(type); 481 return NULL; 482 } 483 free(cipher); 484 485 if (strstr(type, "dsa")) { 486 ktype = KEY_DSA; 487 } else if (strstr(type, "rsa")) { 488 ktype = KEY_RSA; 489 } else { 490 sshbuf_free(b); 491 free(type); 492 return NULL; 493 } 494 if ((key = sshkey_new(ktype)) == NULL) 495 fatal("sshkey_new failed"); 496 free(type); 497 498 switch (key->type) { 499 case KEY_DSA: 500 if ((dsa_p = BN_new()) == NULL || 501 (dsa_q = BN_new()) == NULL || 502 (dsa_g = BN_new()) == NULL || 503 (dsa_pub_key = BN_new()) == NULL || 504 (dsa_priv_key = BN_new()) == NULL) 505 fatal("%s: BN_new", __func__); 506 buffer_get_bignum_bits(b, dsa_p); 507 buffer_get_bignum_bits(b, dsa_g); 508 buffer_get_bignum_bits(b, dsa_q); 509 buffer_get_bignum_bits(b, dsa_pub_key); 510 buffer_get_bignum_bits(b, dsa_priv_key); 511 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) 512 fatal("%s: DSA_set0_pqg failed", __func__); 513 dsa_p = dsa_q = dsa_g = NULL; /* transferred */ 514 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key)) 515 fatal("%s: DSA_set0_key failed", __func__); 516 dsa_pub_key = dsa_priv_key = NULL; /* transferred */ 517 break; 518 case KEY_RSA: 519 if ((r = sshbuf_get_u8(b, &e1)) != 0 || 520 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) || 521 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0)) 522 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 523 e = e1; 524 debug("e %lx", e); 525 if (e < 30) { 526 e <<= 8; 527 e += e2; 528 debug("e %lx", e); 529 e <<= 8; 530 e += e3; 531 debug("e %lx", e); 532 } 533 if ((rsa_e = BN_new()) == NULL) 534 fatal("%s: BN_new", __func__); 535 if (!BN_set_word(rsa_e, e)) { 536 BN_clear_free(rsa_e); 537 sshbuf_free(b); 538 sshkey_free(key); 539 return NULL; 540 } 541 if ((rsa_n = BN_new()) == NULL || 542 (rsa_d = BN_new()) == NULL || 543 (rsa_p = BN_new()) == NULL || 544 (rsa_q = BN_new()) == NULL || 545 (rsa_iqmp = BN_new()) == NULL) 546 fatal("%s: BN_new", __func__); 547 buffer_get_bignum_bits(b, rsa_d); 548 buffer_get_bignum_bits(b, rsa_n); 549 buffer_get_bignum_bits(b, rsa_iqmp); 550 buffer_get_bignum_bits(b, rsa_q); 551 buffer_get_bignum_bits(b, rsa_p); 552 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d)) 553 fatal("%s: RSA_set0_key failed", __func__); 554 rsa_n = rsa_e = rsa_d = NULL; /* transferred */ 555 if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q)) 556 fatal("%s: RSA_set0_factors failed", __func__); 557 rsa_p = rsa_q = NULL; /* transferred */ 558 if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0) 559 fatal("generate RSA parameters failed: %s", ssh_err(r)); 560 BN_clear_free(rsa_iqmp); 561 break; 562 } 563 rlen = sshbuf_len(b); 564 if (rlen != 0) 565 error("do_convert_private_ssh2_from_blob: " 566 "remaining bytes in key blob %d", rlen); 567 sshbuf_free(b); 568 569 /* try the key */ 570 if (sshkey_sign(key, &sig, &slen, data, sizeof(data), NULL, 0) != 0 || 571 sshkey_verify(key, sig, slen, data, sizeof(data), NULL, 0) != 0) { 572 sshkey_free(key); 573 free(sig); 574 return NULL; 575 } 576 free(sig); 577 return key; 578 } 579 580 static int 581 get_line(FILE *fp, char *line, size_t len) 582 { 583 int c; 584 size_t pos = 0; 585 586 line[0] = '\0'; 587 while ((c = fgetc(fp)) != EOF) { 588 if (pos >= len - 1) 589 fatal("input line too long."); 590 switch (c) { 591 case '\r': 592 c = fgetc(fp); 593 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) 594 fatal("unget: %s", strerror(errno)); 595 return pos; 596 case '\n': 597 return pos; 598 } 599 line[pos++] = c; 600 line[pos] = '\0'; 601 } 602 /* We reached EOF */ 603 return -1; 604 } 605 606 static void 607 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private) 608 { 609 int r, blen, escaped = 0; 610 u_int len; 611 char line[1024]; 612 u_char blob[8096]; 613 char encoded[8096]; 614 FILE *fp; 615 616 if ((fp = fopen(identity_file, "r")) == NULL) 617 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 618 encoded[0] = '\0'; 619 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 620 if (blen > 0 && line[blen - 1] == '\\') 621 escaped++; 622 if (strncmp(line, "----", 4) == 0 || 623 strstr(line, ": ") != NULL) { 624 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 625 *private = 1; 626 if (strstr(line, " END ") != NULL) { 627 break; 628 } 629 /* fprintf(stderr, "ignore: %s", line); */ 630 continue; 631 } 632 if (escaped) { 633 escaped--; 634 /* fprintf(stderr, "escaped: %s", line); */ 635 continue; 636 } 637 strlcat(encoded, line, sizeof(encoded)); 638 } 639 len = strlen(encoded); 640 if (((len % 4) == 3) && 641 (encoded[len-1] == '=') && 642 (encoded[len-2] == '=') && 643 (encoded[len-3] == '=')) 644 encoded[len-3] = '\0'; 645 blen = uudecode(encoded, blob, sizeof(blob)); 646 if (blen < 0) 647 fatal("uudecode failed."); 648 if (*private) 649 *k = do_convert_private_ssh2_from_blob(blob, blen); 650 else if ((r = sshkey_from_blob(blob, blen, k)) != 0) 651 fatal("decode blob failed: %s", ssh_err(r)); 652 fclose(fp); 653 } 654 655 static void 656 do_convert_from_pkcs8(struct sshkey **k, int *private) 657 { 658 EVP_PKEY *pubkey; 659 FILE *fp; 660 661 if ((fp = fopen(identity_file, "r")) == NULL) 662 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 663 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 664 fatal("%s: %s is not a recognised public key format", __func__, 665 identity_file); 666 } 667 fclose(fp); 668 switch (EVP_PKEY_base_id(pubkey)) { 669 case EVP_PKEY_RSA: 670 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 671 fatal("sshkey_new failed"); 672 (*k)->type = KEY_RSA; 673 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 674 break; 675 case EVP_PKEY_DSA: 676 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 677 fatal("sshkey_new failed"); 678 (*k)->type = KEY_DSA; 679 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 680 break; 681 #ifdef OPENSSL_HAS_ECC 682 case EVP_PKEY_EC: 683 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 684 fatal("sshkey_new failed"); 685 (*k)->type = KEY_ECDSA; 686 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 687 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa); 688 break; 689 #endif 690 default: 691 fatal("%s: unsupported pubkey type %d", __func__, 692 EVP_PKEY_base_id(pubkey)); 693 } 694 EVP_PKEY_free(pubkey); 695 return; 696 } 697 698 static void 699 do_convert_from_pem(struct sshkey **k, int *private) 700 { 701 FILE *fp; 702 RSA *rsa; 703 704 if ((fp = fopen(identity_file, "r")) == NULL) 705 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 706 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 707 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 708 fatal("sshkey_new failed"); 709 (*k)->type = KEY_RSA; 710 (*k)->rsa = rsa; 711 fclose(fp); 712 return; 713 } 714 fatal("%s: unrecognised raw private key format", __func__); 715 } 716 717 static void 718 do_convert_from(struct passwd *pw) 719 { 720 struct sshkey *k = NULL; 721 int r, private = 0, ok = 0; 722 struct stat st; 723 724 if (!have_identity) 725 ask_filename(pw, "Enter file in which the key is"); 726 if (stat(identity_file, &st) < 0) 727 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 728 729 switch (convert_format) { 730 case FMT_RFC4716: 731 do_convert_from_ssh2(pw, &k, &private); 732 break; 733 case FMT_PKCS8: 734 do_convert_from_pkcs8(&k, &private); 735 break; 736 case FMT_PEM: 737 do_convert_from_pem(&k, &private); 738 break; 739 default: 740 fatal("%s: unknown key format %d", __func__, convert_format); 741 } 742 743 if (!private) { 744 if ((r = sshkey_write(k, stdout)) == 0) 745 ok = 1; 746 if (ok) 747 fprintf(stdout, "\n"); 748 } else { 749 switch (k->type) { 750 case KEY_DSA: 751 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 752 NULL, 0, NULL, NULL); 753 break; 754 #ifdef OPENSSL_HAS_ECC 755 case KEY_ECDSA: 756 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 757 NULL, 0, NULL, NULL); 758 break; 759 #endif 760 case KEY_RSA: 761 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 762 NULL, 0, NULL, NULL); 763 break; 764 default: 765 fatal("%s: unsupported key type %s", __func__, 766 sshkey_type(k)); 767 } 768 } 769 770 if (!ok) 771 fatal("key write failed"); 772 sshkey_free(k); 773 exit(0); 774 } 775 #endif 776 777 static void 778 do_print_public(struct passwd *pw) 779 { 780 struct sshkey *prv; 781 struct stat st; 782 int r; 783 784 if (!have_identity) 785 ask_filename(pw, "Enter file in which the key is"); 786 if (stat(identity_file, &st) < 0) 787 fatal("%s: %s", identity_file, strerror(errno)); 788 prv = load_identity(identity_file); 789 if ((r = sshkey_write(prv, stdout)) != 0) 790 error("sshkey_write failed: %s", ssh_err(r)); 791 sshkey_free(prv); 792 fprintf(stdout, "\n"); 793 exit(0); 794 } 795 796 static void 797 do_download(struct passwd *pw) 798 { 799 #ifdef ENABLE_PKCS11 800 struct sshkey **keys = NULL; 801 int i, nkeys; 802 enum sshkey_fp_rep rep; 803 int fptype; 804 char *fp, *ra; 805 806 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 807 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 808 809 pkcs11_init(0); 810 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 811 if (nkeys <= 0) 812 fatal("cannot read public key from pkcs11"); 813 for (i = 0; i < nkeys; i++) { 814 if (print_fingerprint) { 815 fp = sshkey_fingerprint(keys[i], fptype, rep); 816 ra = sshkey_fingerprint(keys[i], fingerprint_hash, 817 SSH_FP_RANDOMART); 818 if (fp == NULL || ra == NULL) 819 fatal("%s: sshkey_fingerprint fail", __func__); 820 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]), 821 fp, sshkey_type(keys[i])); 822 if (log_level >= SYSLOG_LEVEL_VERBOSE) 823 printf("%s\n", ra); 824 free(ra); 825 free(fp); 826 } else { 827 (void) sshkey_write(keys[i], stdout); /* XXX check */ 828 fprintf(stdout, "\n"); 829 } 830 sshkey_free(keys[i]); 831 } 832 free(keys); 833 pkcs11_terminate(); 834 exit(0); 835 #else 836 fatal("no pkcs11 support"); 837 #endif /* ENABLE_PKCS11 */ 838 } 839 840 static struct sshkey * 841 try_read_key(char **cpp) 842 { 843 struct sshkey *ret; 844 int r; 845 846 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL) 847 fatal("sshkey_new failed"); 848 if ((r = sshkey_read(ret, cpp)) == 0) 849 return ret; 850 /* Not a key */ 851 sshkey_free(ret); 852 return NULL; 853 } 854 855 static void 856 fingerprint_one_key(const struct sshkey *public, const char *comment) 857 { 858 char *fp = NULL, *ra = NULL; 859 enum sshkey_fp_rep rep; 860 int fptype; 861 862 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 863 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 864 fp = sshkey_fingerprint(public, fptype, rep); 865 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART); 866 if (fp == NULL || ra == NULL) 867 fatal("%s: sshkey_fingerprint failed", __func__); 868 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp, 869 comment ? comment : "no comment", sshkey_type(public)); 870 if (log_level >= SYSLOG_LEVEL_VERBOSE) 871 printf("%s\n", ra); 872 free(ra); 873 free(fp); 874 } 875 876 static void 877 fingerprint_private(const char *path) 878 { 879 struct stat st; 880 char *comment = NULL; 881 struct sshkey *public = NULL; 882 int r; 883 884 if (stat(identity_file, &st) < 0) 885 fatal("%s: %s", path, strerror(errno)); 886 if ((r = sshkey_load_public(path, &public, &comment)) != 0) { 887 debug("load public \"%s\": %s", path, ssh_err(r)); 888 if ((r = sshkey_load_private(path, NULL, 889 &public, &comment)) != 0) { 890 debug("load private \"%s\": %s", path, ssh_err(r)); 891 fatal("%s is not a key file.", path); 892 } 893 } 894 895 fingerprint_one_key(public, comment); 896 sshkey_free(public); 897 free(comment); 898 } 899 900 static void 901 do_fingerprint(struct passwd *pw) 902 { 903 FILE *f; 904 struct sshkey *public = NULL; 905 char *comment = NULL, *cp, *ep, *line = NULL; 906 size_t linesize = 0; 907 int i, invalid = 1; 908 const char *path; 909 u_long lnum = 0; 910 911 if (!have_identity) 912 ask_filename(pw, "Enter file in which the key is"); 913 path = identity_file; 914 915 if (strcmp(identity_file, "-") == 0) { 916 f = stdin; 917 path = "(stdin)"; 918 } else if ((f = fopen(path, "r")) == NULL) 919 fatal("%s: %s: %s", __progname, path, strerror(errno)); 920 921 while (getline(&line, &linesize, f) != -1) { 922 lnum++; 923 cp = line; 924 cp[strcspn(cp, "\n")] = '\0'; 925 /* Trim leading space and comments */ 926 cp = line + strspn(line, " \t"); 927 if (*cp == '#' || *cp == '\0') 928 continue; 929 930 /* 931 * Input may be plain keys, private keys, authorized_keys 932 * or known_hosts. 933 */ 934 935 /* 936 * Try private keys first. Assume a key is private if 937 * "SSH PRIVATE KEY" appears on the first line and we're 938 * not reading from stdin (XXX support private keys on stdin). 939 */ 940 if (lnum == 1 && strcmp(identity_file, "-") != 0 && 941 strstr(cp, "PRIVATE KEY") != NULL) { 942 free(line); 943 fclose(f); 944 fingerprint_private(path); 945 exit(0); 946 } 947 948 /* 949 * If it's not a private key, then this must be prepared to 950 * accept a public key prefixed with a hostname or options. 951 * Try a bare key first, otherwise skip the leading stuff. 952 */ 953 if ((public = try_read_key(&cp)) == NULL) { 954 i = strtol(cp, &ep, 10); 955 if (i == 0 || ep == NULL || 956 (*ep != ' ' && *ep != '\t')) { 957 int quoted = 0; 958 959 comment = cp; 960 for (; *cp && (quoted || (*cp != ' ' && 961 *cp != '\t')); cp++) { 962 if (*cp == '\\' && cp[1] == '"') 963 cp++; /* Skip both */ 964 else if (*cp == '"') 965 quoted = !quoted; 966 } 967 if (!*cp) 968 continue; 969 *cp++ = '\0'; 970 } 971 } 972 /* Retry after parsing leading hostname/key options */ 973 if (public == NULL && (public = try_read_key(&cp)) == NULL) { 974 debug("%s:%lu: not a public key", path, lnum); 975 continue; 976 } 977 978 /* Find trailing comment, if any */ 979 for (; *cp == ' ' || *cp == '\t'; cp++) 980 ; 981 if (*cp != '\0' && *cp != '#') 982 comment = cp; 983 984 fingerprint_one_key(public, comment); 985 sshkey_free(public); 986 invalid = 0; /* One good key in the file is sufficient */ 987 } 988 fclose(f); 989 free(line); 990 991 if (invalid) 992 fatal("%s is not a public key file.", path); 993 exit(0); 994 } 995 996 static void 997 do_gen_all_hostkeys(struct passwd *pw) 998 { 999 struct { 1000 char *key_type; 1001 char *key_type_display; 1002 char *path; 1003 } key_types[] = { 1004 #ifdef WITH_OPENSSL 1005 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 1006 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 1007 #ifdef OPENSSL_HAS_ECC 1008 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 1009 #endif /* OPENSSL_HAS_ECC */ 1010 #endif /* WITH_OPENSSL */ 1011 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE }, 1012 #ifdef WITH_XMSS 1013 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE }, 1014 #endif /* WITH_XMSS */ 1015 { NULL, NULL, NULL } 1016 }; 1017 1018 int first = 0; 1019 struct stat st; 1020 struct sshkey *private, *public; 1021 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file; 1022 int i, type, fd, r; 1023 FILE *f; 1024 1025 for (i = 0; key_types[i].key_type; i++) { 1026 public = private = NULL; 1027 prv_tmp = pub_tmp = prv_file = pub_file = NULL; 1028 1029 xasprintf(&prv_file, "%s%s", 1030 identity_file, key_types[i].path); 1031 1032 /* Check whether private key exists and is not zero-length */ 1033 if (stat(prv_file, &st) == 0) { 1034 if (st.st_size != 0) 1035 goto next; 1036 } else if (errno != ENOENT) { 1037 error("Could not stat %s: %s", key_types[i].path, 1038 strerror(errno)); 1039 goto failnext; 1040 } 1041 1042 /* 1043 * Private key doesn't exist or is invalid; proceed with 1044 * key generation. 1045 */ 1046 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX", 1047 identity_file, key_types[i].path); 1048 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX", 1049 identity_file, key_types[i].path); 1050 xasprintf(&pub_file, "%s%s.pub", 1051 identity_file, key_types[i].path); 1052 1053 if (first == 0) { 1054 first = 1; 1055 printf("%s: generating new host keys: ", __progname); 1056 } 1057 printf("%s ", key_types[i].key_type_display); 1058 fflush(stdout); 1059 type = sshkey_type_from_name(key_types[i].key_type); 1060 if ((fd = mkstemp(prv_tmp)) == -1) { 1061 error("Could not save your public key in %s: %s", 1062 prv_tmp, strerror(errno)); 1063 goto failnext; 1064 } 1065 close(fd); /* just using mkstemp() to generate/reserve a name */ 1066 bits = 0; 1067 type_bits_valid(type, NULL, &bits); 1068 if ((r = sshkey_generate(type, bits, &private)) != 0) { 1069 error("sshkey_generate failed: %s", ssh_err(r)); 1070 goto failnext; 1071 } 1072 if ((r = sshkey_from_private(private, &public)) != 0) 1073 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1074 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 1075 hostname); 1076 if ((r = sshkey_save_private(private, prv_tmp, "", 1077 comment, use_new_format, new_format_cipher, rounds)) != 0) { 1078 error("Saving key \"%s\" failed: %s", 1079 prv_tmp, ssh_err(r)); 1080 goto failnext; 1081 } 1082 if ((fd = mkstemp(pub_tmp)) == -1) { 1083 error("Could not save your public key in %s: %s", 1084 pub_tmp, strerror(errno)); 1085 goto failnext; 1086 } 1087 (void)fchmod(fd, 0644); 1088 f = fdopen(fd, "w"); 1089 if (f == NULL) { 1090 error("fdopen %s failed: %s", pub_tmp, strerror(errno)); 1091 close(fd); 1092 goto failnext; 1093 } 1094 if ((r = sshkey_write(public, f)) != 0) { 1095 error("write key failed: %s", ssh_err(r)); 1096 fclose(f); 1097 goto failnext; 1098 } 1099 fprintf(f, " %s\n", comment); 1100 if (ferror(f) != 0) { 1101 error("write key failed: %s", strerror(errno)); 1102 fclose(f); 1103 goto failnext; 1104 } 1105 if (fclose(f) != 0) { 1106 error("key close failed: %s", strerror(errno)); 1107 goto failnext; 1108 } 1109 1110 /* Rename temporary files to their permanent locations. */ 1111 if (rename(pub_tmp, pub_file) != 0) { 1112 error("Unable to move %s into position: %s", 1113 pub_file, strerror(errno)); 1114 goto failnext; 1115 } 1116 if (rename(prv_tmp, prv_file) != 0) { 1117 error("Unable to move %s into position: %s", 1118 key_types[i].path, strerror(errno)); 1119 failnext: 1120 first = 0; 1121 goto next; 1122 } 1123 next: 1124 sshkey_free(private); 1125 sshkey_free(public); 1126 free(prv_tmp); 1127 free(pub_tmp); 1128 free(prv_file); 1129 free(pub_file); 1130 } 1131 if (first != 0) 1132 printf("\n"); 1133 } 1134 1135 struct known_hosts_ctx { 1136 const char *host; /* Hostname searched for in find/delete case */ 1137 FILE *out; /* Output file, stdout for find_hosts case */ 1138 int has_unhashed; /* When hashing, original had unhashed hosts */ 1139 int found_key; /* For find/delete, host was found */ 1140 int invalid; /* File contained invalid items; don't delete */ 1141 }; 1142 1143 static int 1144 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx) 1145 { 1146 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1147 char *hashed, *cp, *hosts, *ohosts; 1148 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts); 1149 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM; 1150 1151 switch (l->status) { 1152 case HKF_STATUS_OK: 1153 case HKF_STATUS_MATCHED: 1154 /* 1155 * Don't hash hosts already already hashed, with wildcard 1156 * characters or a CA/revocation marker. 1157 */ 1158 if (was_hashed || has_wild || l->marker != MRK_NONE) { 1159 fprintf(ctx->out, "%s\n", l->line); 1160 if (has_wild && !find_host) { 1161 logit("%s:%lu: ignoring host name " 1162 "with wildcard: %.64s", l->path, 1163 l->linenum, l->hosts); 1164 } 1165 return 0; 1166 } 1167 /* 1168 * Split any comma-separated hostnames from the host list, 1169 * hash and store separately. 1170 */ 1171 ohosts = hosts = xstrdup(l->hosts); 1172 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') { 1173 lowercase(cp); 1174 if ((hashed = host_hash(cp, NULL, 0)) == NULL) 1175 fatal("hash_host failed"); 1176 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey); 1177 ctx->has_unhashed = 1; 1178 } 1179 free(ohosts); 1180 return 0; 1181 case HKF_STATUS_INVALID: 1182 /* Retain invalid lines, but mark file as invalid. */ 1183 ctx->invalid = 1; 1184 logit("%s:%lu: invalid line", l->path, l->linenum); 1185 /* FALLTHROUGH */ 1186 default: 1187 fprintf(ctx->out, "%s\n", l->line); 1188 return 0; 1189 } 1190 /* NOTREACHED */ 1191 return -1; 1192 } 1193 1194 static int 1195 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx) 1196 { 1197 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1198 enum sshkey_fp_rep rep; 1199 int fptype; 1200 char *fp; 1201 1202 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 1203 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 1204 1205 if (l->status == HKF_STATUS_MATCHED) { 1206 if (delete_host) { 1207 if (l->marker != MRK_NONE) { 1208 /* Don't remove CA and revocation lines */ 1209 fprintf(ctx->out, "%s\n", l->line); 1210 } else { 1211 /* 1212 * Hostname matches and has no CA/revoke 1213 * marker, delete it by *not* writing the 1214 * line to ctx->out. 1215 */ 1216 ctx->found_key = 1; 1217 if (!quiet) 1218 printf("# Host %s found: line %lu\n", 1219 ctx->host, l->linenum); 1220 } 1221 return 0; 1222 } else if (find_host) { 1223 ctx->found_key = 1; 1224 if (!quiet) { 1225 printf("# Host %s found: line %lu %s\n", 1226 ctx->host, 1227 l->linenum, l->marker == MRK_CA ? "CA" : 1228 (l->marker == MRK_REVOKE ? "REVOKED" : "")); 1229 } 1230 if (hash_hosts) 1231 known_hosts_hash(l, ctx); 1232 else if (print_fingerprint) { 1233 fp = sshkey_fingerprint(l->key, fptype, rep); 1234 mprintf("%s %s %s %s\n", ctx->host, 1235 sshkey_type(l->key), fp, l->comment); 1236 free(fp); 1237 } else 1238 fprintf(ctx->out, "%s\n", l->line); 1239 return 0; 1240 } 1241 } else if (delete_host) { 1242 /* Retain non-matching hosts when deleting */ 1243 if (l->status == HKF_STATUS_INVALID) { 1244 ctx->invalid = 1; 1245 logit("%s:%lu: invalid line", l->path, l->linenum); 1246 } 1247 fprintf(ctx->out, "%s\n", l->line); 1248 } 1249 return 0; 1250 } 1251 1252 static void 1253 do_known_hosts(struct passwd *pw, const char *name) 1254 { 1255 char *cp, tmp[PATH_MAX], old[PATH_MAX]; 1256 int r, fd, oerrno, inplace = 0; 1257 struct known_hosts_ctx ctx; 1258 u_int foreach_options; 1259 1260 if (!have_identity) { 1261 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1262 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1263 sizeof(identity_file)) 1264 fatal("Specified known hosts path too long"); 1265 free(cp); 1266 have_identity = 1; 1267 } 1268 1269 memset(&ctx, 0, sizeof(ctx)); 1270 ctx.out = stdout; 1271 ctx.host = name; 1272 1273 /* 1274 * Find hosts goes to stdout, hash and deletions happen in-place 1275 * A corner case is ssh-keygen -HF foo, which should go to stdout 1276 */ 1277 if (!find_host && (hash_hosts || delete_host)) { 1278 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1279 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1280 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1281 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1282 fatal("known_hosts path too long"); 1283 umask(077); 1284 if ((fd = mkstemp(tmp)) == -1) 1285 fatal("mkstemp: %s", strerror(errno)); 1286 if ((ctx.out = fdopen(fd, "w")) == NULL) { 1287 oerrno = errno; 1288 unlink(tmp); 1289 fatal("fdopen: %s", strerror(oerrno)); 1290 } 1291 inplace = 1; 1292 } 1293 /* XXX support identity_file == "-" for stdin */ 1294 foreach_options = find_host ? HKF_WANT_MATCH : 0; 1295 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0; 1296 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ? 1297 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL, 1298 foreach_options)) != 0) { 1299 if (inplace) 1300 unlink(tmp); 1301 fatal("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r)); 1302 } 1303 1304 if (inplace) 1305 fclose(ctx.out); 1306 1307 if (ctx.invalid) { 1308 error("%s is not a valid known_hosts file.", identity_file); 1309 if (inplace) { 1310 error("Not replacing existing known_hosts " 1311 "file because of errors"); 1312 unlink(tmp); 1313 } 1314 exit(1); 1315 } else if (delete_host && !ctx.found_key) { 1316 logit("Host %s not found in %s", name, identity_file); 1317 if (inplace) 1318 unlink(tmp); 1319 } else if (inplace) { 1320 /* Backup existing file */ 1321 if (unlink(old) == -1 && errno != ENOENT) 1322 fatal("unlink %.100s: %s", old, strerror(errno)); 1323 if (link(identity_file, old) == -1) 1324 fatal("link %.100s to %.100s: %s", identity_file, old, 1325 strerror(errno)); 1326 /* Move new one into place */ 1327 if (rename(tmp, identity_file) == -1) { 1328 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1329 strerror(errno)); 1330 unlink(tmp); 1331 unlink(old); 1332 exit(1); 1333 } 1334 1335 printf("%s updated.\n", identity_file); 1336 printf("Original contents retained as %s\n", old); 1337 if (ctx.has_unhashed) { 1338 logit("WARNING: %s contains unhashed entries", old); 1339 logit("Delete this file to ensure privacy " 1340 "of hostnames"); 1341 } 1342 } 1343 1344 exit (find_host && !ctx.found_key); 1345 } 1346 1347 /* 1348 * Perform changing a passphrase. The argument is the passwd structure 1349 * for the current user. 1350 */ 1351 static void 1352 do_change_passphrase(struct passwd *pw) 1353 { 1354 char *comment; 1355 char *old_passphrase, *passphrase1, *passphrase2; 1356 struct stat st; 1357 struct sshkey *private; 1358 int r; 1359 1360 if (!have_identity) 1361 ask_filename(pw, "Enter file in which the key is"); 1362 if (stat(identity_file, &st) < 0) 1363 fatal("%s: %s", identity_file, strerror(errno)); 1364 /* Try to load the file with empty passphrase. */ 1365 r = sshkey_load_private(identity_file, "", &private, &comment); 1366 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) { 1367 if (identity_passphrase) 1368 old_passphrase = xstrdup(identity_passphrase); 1369 else 1370 old_passphrase = 1371 read_passphrase("Enter old passphrase: ", 1372 RP_ALLOW_STDIN); 1373 r = sshkey_load_private(identity_file, old_passphrase, 1374 &private, &comment); 1375 explicit_bzero(old_passphrase, strlen(old_passphrase)); 1376 free(old_passphrase); 1377 if (r != 0) 1378 goto badkey; 1379 } else if (r != 0) { 1380 badkey: 1381 fatal("Failed to load key %s: %s", identity_file, ssh_err(r)); 1382 } 1383 if (comment) 1384 mprintf("Key has comment '%s'\n", comment); 1385 1386 /* Ask the new passphrase (twice). */ 1387 if (identity_new_passphrase) { 1388 passphrase1 = xstrdup(identity_new_passphrase); 1389 passphrase2 = NULL; 1390 } else { 1391 passphrase1 = 1392 read_passphrase("Enter new passphrase (empty for no " 1393 "passphrase): ", RP_ALLOW_STDIN); 1394 passphrase2 = read_passphrase("Enter same passphrase again: ", 1395 RP_ALLOW_STDIN); 1396 1397 /* Verify that they are the same. */ 1398 if (strcmp(passphrase1, passphrase2) != 0) { 1399 explicit_bzero(passphrase1, strlen(passphrase1)); 1400 explicit_bzero(passphrase2, strlen(passphrase2)); 1401 free(passphrase1); 1402 free(passphrase2); 1403 printf("Pass phrases do not match. Try again.\n"); 1404 exit(1); 1405 } 1406 /* Destroy the other copy. */ 1407 explicit_bzero(passphrase2, strlen(passphrase2)); 1408 free(passphrase2); 1409 } 1410 1411 /* Save the file using the new passphrase. */ 1412 if ((r = sshkey_save_private(private, identity_file, passphrase1, 1413 comment, use_new_format, new_format_cipher, rounds)) != 0) { 1414 error("Saving key \"%s\" failed: %s.", 1415 identity_file, ssh_err(r)); 1416 explicit_bzero(passphrase1, strlen(passphrase1)); 1417 free(passphrase1); 1418 sshkey_free(private); 1419 free(comment); 1420 exit(1); 1421 } 1422 /* Destroy the passphrase and the copy of the key in memory. */ 1423 explicit_bzero(passphrase1, strlen(passphrase1)); 1424 free(passphrase1); 1425 sshkey_free(private); /* Destroys contents */ 1426 free(comment); 1427 1428 printf("Your identification has been saved with the new passphrase.\n"); 1429 exit(0); 1430 } 1431 1432 /* 1433 * Print the SSHFP RR. 1434 */ 1435 static int 1436 do_print_resource_record(struct passwd *pw, char *fname, char *hname) 1437 { 1438 struct sshkey *public; 1439 char *comment = NULL; 1440 struct stat st; 1441 int r; 1442 1443 if (fname == NULL) 1444 fatal("%s: no filename", __func__); 1445 if (stat(fname, &st) < 0) { 1446 if (errno == ENOENT) 1447 return 0; 1448 fatal("%s: %s", fname, strerror(errno)); 1449 } 1450 if ((r = sshkey_load_public(fname, &public, &comment)) != 0) 1451 fatal("Failed to read v2 public key from \"%s\": %s.", 1452 fname, ssh_err(r)); 1453 export_dns_rr(hname, public, stdout, print_generic); 1454 sshkey_free(public); 1455 free(comment); 1456 return 1; 1457 } 1458 1459 /* 1460 * Change the comment of a private key file. 1461 */ 1462 static void 1463 do_change_comment(struct passwd *pw) 1464 { 1465 char new_comment[1024], *comment, *passphrase; 1466 struct sshkey *private; 1467 struct sshkey *public; 1468 struct stat st; 1469 FILE *f; 1470 int r, fd; 1471 1472 if (!have_identity) 1473 ask_filename(pw, "Enter file in which the key is"); 1474 if (stat(identity_file, &st) < 0) 1475 fatal("%s: %s", identity_file, strerror(errno)); 1476 if ((r = sshkey_load_private(identity_file, "", 1477 &private, &comment)) == 0) 1478 passphrase = xstrdup(""); 1479 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 1480 fatal("Cannot load private key \"%s\": %s.", 1481 identity_file, ssh_err(r)); 1482 else { 1483 if (identity_passphrase) 1484 passphrase = xstrdup(identity_passphrase); 1485 else if (identity_new_passphrase) 1486 passphrase = xstrdup(identity_new_passphrase); 1487 else 1488 passphrase = read_passphrase("Enter passphrase: ", 1489 RP_ALLOW_STDIN); 1490 /* Try to load using the passphrase. */ 1491 if ((r = sshkey_load_private(identity_file, passphrase, 1492 &private, &comment)) != 0) { 1493 explicit_bzero(passphrase, strlen(passphrase)); 1494 free(passphrase); 1495 fatal("Cannot load private key \"%s\": %s.", 1496 identity_file, ssh_err(r)); 1497 } 1498 } 1499 1500 if (private->type != KEY_ED25519 && private->type != KEY_XMSS && 1501 !use_new_format) { 1502 error("Comments are only supported for keys stored in " 1503 "the new format (-o)."); 1504 explicit_bzero(passphrase, strlen(passphrase)); 1505 sshkey_free(private); 1506 exit(1); 1507 } 1508 if (comment) 1509 printf("Key now has comment '%s'\n", comment); 1510 else 1511 printf("Key now has no comment\n"); 1512 1513 if (identity_comment) { 1514 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1515 } else { 1516 printf("Enter new comment: "); 1517 fflush(stdout); 1518 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1519 explicit_bzero(passphrase, strlen(passphrase)); 1520 sshkey_free(private); 1521 exit(1); 1522 } 1523 new_comment[strcspn(new_comment, "\n")] = '\0'; 1524 } 1525 1526 /* Save the file using the new passphrase. */ 1527 if ((r = sshkey_save_private(private, identity_file, passphrase, 1528 new_comment, use_new_format, new_format_cipher, rounds)) != 0) { 1529 error("Saving key \"%s\" failed: %s", 1530 identity_file, ssh_err(r)); 1531 explicit_bzero(passphrase, strlen(passphrase)); 1532 free(passphrase); 1533 sshkey_free(private); 1534 free(comment); 1535 exit(1); 1536 } 1537 explicit_bzero(passphrase, strlen(passphrase)); 1538 free(passphrase); 1539 if ((r = sshkey_from_private(private, &public)) != 0) 1540 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1541 sshkey_free(private); 1542 1543 strlcat(identity_file, ".pub", sizeof(identity_file)); 1544 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1545 if (fd == -1) 1546 fatal("Could not save your public key in %s", identity_file); 1547 f = fdopen(fd, "w"); 1548 if (f == NULL) 1549 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 1550 if ((r = sshkey_write(public, f)) != 0) 1551 fatal("write key failed: %s", ssh_err(r)); 1552 sshkey_free(public); 1553 fprintf(f, " %s\n", new_comment); 1554 fclose(f); 1555 1556 free(comment); 1557 1558 printf("The comment in your key file has been changed.\n"); 1559 exit(0); 1560 } 1561 1562 static void 1563 add_flag_option(struct sshbuf *c, const char *name) 1564 { 1565 int r; 1566 1567 debug3("%s: %s", __func__, name); 1568 if ((r = sshbuf_put_cstring(c, name)) != 0 || 1569 (r = sshbuf_put_string(c, NULL, 0)) != 0) 1570 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1571 } 1572 1573 static void 1574 add_string_option(struct sshbuf *c, const char *name, const char *value) 1575 { 1576 struct sshbuf *b; 1577 int r; 1578 1579 debug3("%s: %s=%s", __func__, name, value); 1580 if ((b = sshbuf_new()) == NULL) 1581 fatal("%s: sshbuf_new failed", __func__); 1582 if ((r = sshbuf_put_cstring(b, value)) != 0 || 1583 (r = sshbuf_put_cstring(c, name)) != 0 || 1584 (r = sshbuf_put_stringb(c, b)) != 0) 1585 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1586 1587 sshbuf_free(b); 1588 } 1589 1590 #define OPTIONS_CRITICAL 1 1591 #define OPTIONS_EXTENSIONS 2 1592 static void 1593 prepare_options_buf(struct sshbuf *c, int which) 1594 { 1595 size_t i; 1596 1597 sshbuf_reset(c); 1598 if ((which & OPTIONS_CRITICAL) != 0 && 1599 certflags_command != NULL) 1600 add_string_option(c, "force-command", certflags_command); 1601 if ((which & OPTIONS_EXTENSIONS) != 0 && 1602 (certflags_flags & CERTOPT_X_FWD) != 0) 1603 add_flag_option(c, "permit-X11-forwarding"); 1604 if ((which & OPTIONS_EXTENSIONS) != 0 && 1605 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1606 add_flag_option(c, "permit-agent-forwarding"); 1607 if ((which & OPTIONS_EXTENSIONS) != 0 && 1608 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1609 add_flag_option(c, "permit-port-forwarding"); 1610 if ((which & OPTIONS_EXTENSIONS) != 0 && 1611 (certflags_flags & CERTOPT_PTY) != 0) 1612 add_flag_option(c, "permit-pty"); 1613 if ((which & OPTIONS_EXTENSIONS) != 0 && 1614 (certflags_flags & CERTOPT_USER_RC) != 0) 1615 add_flag_option(c, "permit-user-rc"); 1616 if ((which & OPTIONS_CRITICAL) != 0 && 1617 certflags_src_addr != NULL) 1618 add_string_option(c, "source-address", certflags_src_addr); 1619 for (i = 0; i < ncert_userext; i++) { 1620 if ((cert_userext[i].crit && (which & OPTIONS_EXTENSIONS)) || 1621 (!cert_userext[i].crit && (which & OPTIONS_CRITICAL))) 1622 continue; 1623 if (cert_userext[i].val == NULL) 1624 add_flag_option(c, cert_userext[i].key); 1625 else { 1626 add_string_option(c, cert_userext[i].key, 1627 cert_userext[i].val); 1628 } 1629 } 1630 } 1631 1632 static struct sshkey * 1633 load_pkcs11_key(char *path) 1634 { 1635 #ifdef ENABLE_PKCS11 1636 struct sshkey **keys = NULL, *public, *private = NULL; 1637 int r, i, nkeys; 1638 1639 if ((r = sshkey_load_public(path, &public, NULL)) != 0) 1640 fatal("Couldn't load CA public key \"%s\": %s", 1641 path, ssh_err(r)); 1642 1643 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1644 debug3("%s: %d keys", __func__, nkeys); 1645 if (nkeys <= 0) 1646 fatal("cannot read public key from pkcs11"); 1647 for (i = 0; i < nkeys; i++) { 1648 if (sshkey_equal_public(public, keys[i])) { 1649 private = keys[i]; 1650 continue; 1651 } 1652 sshkey_free(keys[i]); 1653 } 1654 free(keys); 1655 sshkey_free(public); 1656 return private; 1657 #else 1658 fatal("no pkcs11 support"); 1659 #endif /* ENABLE_PKCS11 */ 1660 } 1661 1662 /* Signer for sshkey_certify_custom that uses the agent */ 1663 static int 1664 agent_signer(const struct sshkey *key, u_char **sigp, size_t *lenp, 1665 const u_char *data, size_t datalen, 1666 const char *alg, u_int compat, void *ctx) 1667 { 1668 int *agent_fdp = (int *)ctx; 1669 1670 return ssh_agent_sign(*agent_fdp, key, sigp, lenp, 1671 data, datalen, alg, compat); 1672 } 1673 1674 static void 1675 do_ca_sign(struct passwd *pw, int argc, char **argv) 1676 { 1677 int r, i, fd, found, agent_fd = -1; 1678 u_int n; 1679 struct sshkey *ca, *public; 1680 char valid[64], *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1681 FILE *f; 1682 struct ssh_identitylist *agent_ids; 1683 size_t j; 1684 1685 #ifdef ENABLE_PKCS11 1686 pkcs11_init(1); 1687 #endif 1688 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1689 if (pkcs11provider != NULL) { 1690 /* If a PKCS#11 token was specified then try to use it */ 1691 if ((ca = load_pkcs11_key(tmp)) == NULL) 1692 fatal("No PKCS#11 key matching %s found", ca_key_path); 1693 } else if (prefer_agent) { 1694 /* 1695 * Agent signature requested. Try to use agent after making 1696 * sure the public key specified is actually present in the 1697 * agent. 1698 */ 1699 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 1700 fatal("Cannot load CA public key %s: %s", 1701 tmp, ssh_err(r)); 1702 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 1703 fatal("Cannot use public key for CA signature: %s", 1704 ssh_err(r)); 1705 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0) 1706 fatal("Retrieve agent key list: %s", ssh_err(r)); 1707 found = 0; 1708 for (j = 0; j < agent_ids->nkeys; j++) { 1709 if (sshkey_equal(ca, agent_ids->keys[j])) { 1710 found = 1; 1711 break; 1712 } 1713 } 1714 if (!found) 1715 fatal("CA key %s not found in agent", tmp); 1716 ssh_free_identitylist(agent_ids); 1717 ca->flags |= SSHKEY_FLAG_EXT; 1718 } else { 1719 /* CA key is assumed to be a private key on the filesystem */ 1720 ca = load_identity(tmp); 1721 } 1722 free(tmp); 1723 1724 if (key_type_name != NULL && 1725 sshkey_type_from_name(key_type_name) != ca->type) { 1726 fatal("CA key type %s doesn't match specified %s", 1727 sshkey_ssh_name(ca), key_type_name); 1728 } 1729 1730 for (i = 0; i < argc; i++) { 1731 /* Split list of principals */ 1732 n = 0; 1733 if (cert_principals != NULL) { 1734 otmp = tmp = xstrdup(cert_principals); 1735 plist = NULL; 1736 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1737 plist = xreallocarray(plist, n + 1, sizeof(*plist)); 1738 if (*(plist[n] = xstrdup(cp)) == '\0') 1739 fatal("Empty principal name"); 1740 } 1741 free(otmp); 1742 } 1743 if (n > SSHKEY_CERT_MAX_PRINCIPALS) 1744 fatal("Too many certificate principals specified"); 1745 1746 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1747 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0) 1748 fatal("%s: unable to open \"%s\": %s", 1749 __func__, tmp, ssh_err(r)); 1750 if (public->type != KEY_RSA && public->type != KEY_DSA && 1751 public->type != KEY_ECDSA && public->type != KEY_ED25519 && 1752 public->type != KEY_XMSS) 1753 fatal("%s: key \"%s\" type %s cannot be certified", 1754 __func__, tmp, sshkey_type(public)); 1755 1756 /* Prepare certificate to sign */ 1757 if ((r = sshkey_to_certified(public)) != 0) 1758 fatal("Could not upgrade key %s to certificate: %s", 1759 tmp, ssh_err(r)); 1760 public->cert->type = cert_key_type; 1761 public->cert->serial = (u_int64_t)cert_serial; 1762 public->cert->key_id = xstrdup(cert_key_id); 1763 public->cert->nprincipals = n; 1764 public->cert->principals = plist; 1765 public->cert->valid_after = cert_valid_from; 1766 public->cert->valid_before = cert_valid_to; 1767 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL); 1768 prepare_options_buf(public->cert->extensions, 1769 OPTIONS_EXTENSIONS); 1770 if ((r = sshkey_from_private(ca, 1771 &public->cert->signature_key)) != 0) 1772 fatal("sshkey_from_private (ca key): %s", ssh_err(r)); 1773 1774 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) { 1775 if ((r = sshkey_certify_custom(public, ca, 1776 key_type_name, agent_signer, &agent_fd)) != 0) 1777 fatal("Couldn't certify key %s via agent: %s", 1778 tmp, ssh_err(r)); 1779 } else { 1780 if ((sshkey_certify(public, ca, key_type_name)) != 0) 1781 fatal("Couldn't certify key %s: %s", 1782 tmp, ssh_err(r)); 1783 } 1784 1785 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1786 *cp = '\0'; 1787 xasprintf(&out, "%s-cert.pub", tmp); 1788 free(tmp); 1789 1790 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1791 fatal("Could not open \"%s\" for writing: %s", out, 1792 strerror(errno)); 1793 if ((f = fdopen(fd, "w")) == NULL) 1794 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1795 if ((r = sshkey_write(public, f)) != 0) 1796 fatal("Could not write certified key to %s: %s", 1797 out, ssh_err(r)); 1798 fprintf(f, " %s\n", comment); 1799 fclose(f); 1800 1801 if (!quiet) { 1802 sshkey_format_cert_validity(public->cert, 1803 valid, sizeof(valid)); 1804 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1805 "valid %s", sshkey_cert_type(public), 1806 out, public->cert->key_id, 1807 (unsigned long long)public->cert->serial, 1808 cert_principals != NULL ? " for " : "", 1809 cert_principals != NULL ? cert_principals : "", 1810 valid); 1811 } 1812 1813 sshkey_free(public); 1814 free(out); 1815 } 1816 #ifdef ENABLE_PKCS11 1817 pkcs11_terminate(); 1818 #endif 1819 exit(0); 1820 } 1821 1822 static u_int64_t 1823 parse_relative_time(const char *s, time_t now) 1824 { 1825 int64_t mul, secs; 1826 1827 mul = *s == '-' ? -1 : 1; 1828 1829 if ((secs = convtime(s + 1)) == -1) 1830 fatal("Invalid relative certificate time %s", s); 1831 if (mul == -1 && secs > now) 1832 fatal("Certificate time %s cannot be represented", s); 1833 return now + (u_int64_t)(secs * mul); 1834 } 1835 1836 static void 1837 parse_cert_times(char *timespec) 1838 { 1839 char *from, *to; 1840 time_t now = time(NULL); 1841 int64_t secs; 1842 1843 /* +timespec relative to now */ 1844 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1845 if ((secs = convtime(timespec + 1)) == -1) 1846 fatal("Invalid relative certificate life %s", timespec); 1847 cert_valid_to = now + secs; 1848 /* 1849 * Backdate certificate one minute to avoid problems on hosts 1850 * with poorly-synchronised clocks. 1851 */ 1852 cert_valid_from = ((now - 59)/ 60) * 60; 1853 return; 1854 } 1855 1856 /* 1857 * from:to, where 1858 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "always" 1859 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "forever" 1860 */ 1861 from = xstrdup(timespec); 1862 to = strchr(from, ':'); 1863 if (to == NULL || from == to || *(to + 1) == '\0') 1864 fatal("Invalid certificate life specification %s", timespec); 1865 *to++ = '\0'; 1866 1867 if (*from == '-' || *from == '+') 1868 cert_valid_from = parse_relative_time(from, now); 1869 else if (strcmp(from, "always") == 0) 1870 cert_valid_from = 0; 1871 else if (parse_absolute_time(from, &cert_valid_from) != 0) 1872 fatal("Invalid from time \"%s\"", from); 1873 1874 if (*to == '-' || *to == '+') 1875 cert_valid_to = parse_relative_time(to, now); 1876 else if (strcmp(to, "forever") == 0) 1877 cert_valid_to = ~(u_int64_t)0; 1878 else if (parse_absolute_time(to, &cert_valid_to) != 0) 1879 fatal("Invalid to time \"%s\"", to); 1880 1881 if (cert_valid_to <= cert_valid_from) 1882 fatal("Empty certificate validity interval"); 1883 free(from); 1884 } 1885 1886 static void 1887 add_cert_option(char *opt) 1888 { 1889 char *val, *cp; 1890 int iscrit = 0; 1891 1892 if (strcasecmp(opt, "clear") == 0) 1893 certflags_flags = 0; 1894 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1895 certflags_flags &= ~CERTOPT_X_FWD; 1896 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1897 certflags_flags |= CERTOPT_X_FWD; 1898 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1899 certflags_flags &= ~CERTOPT_AGENT_FWD; 1900 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1901 certflags_flags |= CERTOPT_AGENT_FWD; 1902 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1903 certflags_flags &= ~CERTOPT_PORT_FWD; 1904 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1905 certflags_flags |= CERTOPT_PORT_FWD; 1906 else if (strcasecmp(opt, "no-pty") == 0) 1907 certflags_flags &= ~CERTOPT_PTY; 1908 else if (strcasecmp(opt, "permit-pty") == 0) 1909 certflags_flags |= CERTOPT_PTY; 1910 else if (strcasecmp(opt, "no-user-rc") == 0) 1911 certflags_flags &= ~CERTOPT_USER_RC; 1912 else if (strcasecmp(opt, "permit-user-rc") == 0) 1913 certflags_flags |= CERTOPT_USER_RC; 1914 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1915 val = opt + 14; 1916 if (*val == '\0') 1917 fatal("Empty force-command option"); 1918 if (certflags_command != NULL) 1919 fatal("force-command already specified"); 1920 certflags_command = xstrdup(val); 1921 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1922 val = opt + 15; 1923 if (*val == '\0') 1924 fatal("Empty source-address option"); 1925 if (certflags_src_addr != NULL) 1926 fatal("source-address already specified"); 1927 if (addr_match_cidr_list(NULL, val) != 0) 1928 fatal("Invalid source-address list"); 1929 certflags_src_addr = xstrdup(val); 1930 } else if (strncasecmp(opt, "extension:", 10) == 0 || 1931 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) { 1932 val = xstrdup(strchr(opt, ':') + 1); 1933 if ((cp = strchr(val, '=')) != NULL) 1934 *cp++ = '\0'; 1935 cert_userext = xreallocarray(cert_userext, ncert_userext + 1, 1936 sizeof(*cert_userext)); 1937 cert_userext[ncert_userext].key = val; 1938 cert_userext[ncert_userext].val = cp == NULL ? 1939 NULL : xstrdup(cp); 1940 cert_userext[ncert_userext].crit = iscrit; 1941 ncert_userext++; 1942 } else 1943 fatal("Unsupported certificate option \"%s\"", opt); 1944 } 1945 1946 static void 1947 show_options(struct sshbuf *optbuf, int in_critical) 1948 { 1949 char *name, *arg; 1950 struct sshbuf *options, *option = NULL; 1951 int r; 1952 1953 if ((options = sshbuf_fromb(optbuf)) == NULL) 1954 fatal("%s: sshbuf_fromb failed", __func__); 1955 while (sshbuf_len(options) != 0) { 1956 sshbuf_free(option); 1957 option = NULL; 1958 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 || 1959 (r = sshbuf_froms(options, &option)) != 0) 1960 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1961 printf(" %s", name); 1962 if (!in_critical && 1963 (strcmp(name, "permit-X11-forwarding") == 0 || 1964 strcmp(name, "permit-agent-forwarding") == 0 || 1965 strcmp(name, "permit-port-forwarding") == 0 || 1966 strcmp(name, "permit-pty") == 0 || 1967 strcmp(name, "permit-user-rc") == 0)) 1968 printf("\n"); 1969 else if (in_critical && 1970 (strcmp(name, "force-command") == 0 || 1971 strcmp(name, "source-address") == 0)) { 1972 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0) 1973 fatal("%s: buffer error: %s", 1974 __func__, ssh_err(r)); 1975 printf(" %s\n", arg); 1976 free(arg); 1977 } else { 1978 printf(" UNKNOWN OPTION (len %zu)\n", 1979 sshbuf_len(option)); 1980 sshbuf_reset(option); 1981 } 1982 free(name); 1983 if (sshbuf_len(option) != 0) 1984 fatal("Option corrupt: extra data at end"); 1985 } 1986 sshbuf_free(option); 1987 sshbuf_free(options); 1988 } 1989 1990 static void 1991 print_cert(struct sshkey *key) 1992 { 1993 char valid[64], *key_fp, *ca_fp; 1994 u_int i; 1995 1996 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT); 1997 ca_fp = sshkey_fingerprint(key->cert->signature_key, 1998 fingerprint_hash, SSH_FP_DEFAULT); 1999 if (key_fp == NULL || ca_fp == NULL) 2000 fatal("%s: sshkey_fingerprint fail", __func__); 2001 sshkey_format_cert_validity(key->cert, valid, sizeof(valid)); 2002 2003 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key), 2004 sshkey_cert_type(key)); 2005 printf(" Public key: %s %s\n", sshkey_type(key), key_fp); 2006 printf(" Signing CA: %s %s\n", 2007 sshkey_type(key->cert->signature_key), ca_fp); 2008 printf(" Key ID: \"%s\"\n", key->cert->key_id); 2009 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial); 2010 printf(" Valid: %s\n", valid); 2011 printf(" Principals: "); 2012 if (key->cert->nprincipals == 0) 2013 printf("(none)\n"); 2014 else { 2015 for (i = 0; i < key->cert->nprincipals; i++) 2016 printf("\n %s", 2017 key->cert->principals[i]); 2018 printf("\n"); 2019 } 2020 printf(" Critical Options: "); 2021 if (sshbuf_len(key->cert->critical) == 0) 2022 printf("(none)\n"); 2023 else { 2024 printf("\n"); 2025 show_options(key->cert->critical, 1); 2026 } 2027 printf(" Extensions: "); 2028 if (sshbuf_len(key->cert->extensions) == 0) 2029 printf("(none)\n"); 2030 else { 2031 printf("\n"); 2032 show_options(key->cert->extensions, 0); 2033 } 2034 } 2035 2036 static void 2037 do_show_cert(struct passwd *pw) 2038 { 2039 struct sshkey *key = NULL; 2040 struct stat st; 2041 int r, is_stdin = 0, ok = 0; 2042 FILE *f; 2043 char *cp, *line = NULL; 2044 const char *path; 2045 size_t linesize = 0; 2046 u_long lnum = 0; 2047 2048 if (!have_identity) 2049 ask_filename(pw, "Enter file in which the key is"); 2050 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) < 0) 2051 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 2052 2053 path = identity_file; 2054 if (strcmp(path, "-") == 0) { 2055 f = stdin; 2056 path = "(stdin)"; 2057 is_stdin = 1; 2058 } else if ((f = fopen(identity_file, "r")) == NULL) 2059 fatal("fopen %s: %s", identity_file, strerror(errno)); 2060 2061 while (getline(&line, &linesize, f) != -1) { 2062 lnum++; 2063 sshkey_free(key); 2064 key = NULL; 2065 /* Trim leading space and comments */ 2066 cp = line + strspn(line, " \t"); 2067 if (*cp == '#' || *cp == '\0') 2068 continue; 2069 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2070 fatal("sshkey_new"); 2071 if ((r = sshkey_read(key, &cp)) != 0) { 2072 error("%s:%lu: invalid key: %s", path, 2073 lnum, ssh_err(r)); 2074 continue; 2075 } 2076 if (!sshkey_is_cert(key)) { 2077 error("%s:%lu is not a certificate", path, lnum); 2078 continue; 2079 } 2080 ok = 1; 2081 if (!is_stdin && lnum == 1) 2082 printf("%s:\n", path); 2083 else 2084 printf("%s:%lu:\n", path, lnum); 2085 print_cert(key); 2086 } 2087 free(line); 2088 sshkey_free(key); 2089 fclose(f); 2090 exit(ok ? 0 : 1); 2091 } 2092 2093 static void 2094 load_krl(const char *path, struct ssh_krl **krlp) 2095 { 2096 struct sshbuf *krlbuf; 2097 int r, fd; 2098 2099 if ((krlbuf = sshbuf_new()) == NULL) 2100 fatal("sshbuf_new failed"); 2101 if ((fd = open(path, O_RDONLY)) == -1) 2102 fatal("open %s: %s", path, strerror(errno)); 2103 if ((r = sshkey_load_file(fd, krlbuf)) != 0) 2104 fatal("Unable to load KRL: %s", ssh_err(r)); 2105 close(fd); 2106 /* XXX check sigs */ 2107 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 || 2108 *krlp == NULL) 2109 fatal("Invalid KRL file: %s", ssh_err(r)); 2110 sshbuf_free(krlbuf); 2111 } 2112 2113 static void 2114 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp, 2115 const char *file, u_long lnum) 2116 { 2117 char *tmp; 2118 size_t tlen; 2119 struct sshbuf *b; 2120 int r; 2121 2122 if (strncmp(cp, "SHA256:", 7) != 0) 2123 fatal("%s:%lu: unsupported hash algorithm", file, lnum); 2124 cp += 7; 2125 2126 /* 2127 * OpenSSH base64 hashes omit trailing '=' 2128 * characters; put them back for decode. 2129 */ 2130 tlen = strlen(cp); 2131 tmp = xmalloc(tlen + 4 + 1); 2132 strlcpy(tmp, cp, tlen + 1); 2133 while ((tlen % 4) != 0) { 2134 tmp[tlen++] = '='; 2135 tmp[tlen] = '\0'; 2136 } 2137 if ((b = sshbuf_new()) == NULL) 2138 fatal("%s: sshbuf_new failed", __func__); 2139 if ((r = sshbuf_b64tod(b, tmp)) != 0) 2140 fatal("%s:%lu: decode hash failed: %s", file, lnum, ssh_err(r)); 2141 free(tmp); 2142 *lenp = sshbuf_len(b); 2143 *blobp = xmalloc(*lenp); 2144 memcpy(*blobp, sshbuf_ptr(b), *lenp); 2145 sshbuf_free(b); 2146 } 2147 2148 static void 2149 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca, 2150 const struct sshkey *ca, struct ssh_krl *krl) 2151 { 2152 struct sshkey *key = NULL; 2153 u_long lnum = 0; 2154 char *path, *cp, *ep, *line = NULL; 2155 u_char *blob = NULL; 2156 size_t blen = 0, linesize = 0; 2157 unsigned long long serial, serial2; 2158 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r; 2159 FILE *krl_spec; 2160 2161 path = tilde_expand_filename(file, pw->pw_uid); 2162 if (strcmp(path, "-") == 0) { 2163 krl_spec = stdin; 2164 free(path); 2165 path = xstrdup("(standard input)"); 2166 } else if ((krl_spec = fopen(path, "r")) == NULL) 2167 fatal("fopen %s: %s", path, strerror(errno)); 2168 2169 if (!quiet) 2170 printf("Revoking from %s\n", path); 2171 while (getline(&line, &linesize, krl_spec) != -1) { 2172 lnum++; 2173 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0; 2174 cp = line + strspn(line, " \t"); 2175 /* Trim trailing space, comments and strip \n */ 2176 for (i = 0, r = -1; cp[i] != '\0'; i++) { 2177 if (cp[i] == '#' || cp[i] == '\n') { 2178 cp[i] = '\0'; 2179 break; 2180 } 2181 if (cp[i] == ' ' || cp[i] == '\t') { 2182 /* Remember the start of a span of whitespace */ 2183 if (r == -1) 2184 r = i; 2185 } else 2186 r = -1; 2187 } 2188 if (r != -1) 2189 cp[r] = '\0'; 2190 if (*cp == '\0') 2191 continue; 2192 if (strncasecmp(cp, "serial:", 7) == 0) { 2193 if (ca == NULL && !wild_ca) { 2194 fatal("revoking certificates by serial number " 2195 "requires specification of a CA key"); 2196 } 2197 cp += 7; 2198 cp = cp + strspn(cp, " \t"); 2199 errno = 0; 2200 serial = strtoull(cp, &ep, 0); 2201 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 2202 fatal("%s:%lu: invalid serial \"%s\"", 2203 path, lnum, cp); 2204 if (errno == ERANGE && serial == ULLONG_MAX) 2205 fatal("%s:%lu: serial out of range", 2206 path, lnum); 2207 serial2 = serial; 2208 if (*ep == '-') { 2209 cp = ep + 1; 2210 errno = 0; 2211 serial2 = strtoull(cp, &ep, 0); 2212 if (*cp == '\0' || *ep != '\0') 2213 fatal("%s:%lu: invalid serial \"%s\"", 2214 path, lnum, cp); 2215 if (errno == ERANGE && serial2 == ULLONG_MAX) 2216 fatal("%s:%lu: serial out of range", 2217 path, lnum); 2218 if (serial2 <= serial) 2219 fatal("%s:%lu: invalid serial range " 2220 "%llu:%llu", path, lnum, 2221 (unsigned long long)serial, 2222 (unsigned long long)serial2); 2223 } 2224 if (ssh_krl_revoke_cert_by_serial_range(krl, 2225 ca, serial, serial2) != 0) { 2226 fatal("%s: revoke serial failed", 2227 __func__); 2228 } 2229 } else if (strncasecmp(cp, "id:", 3) == 0) { 2230 if (ca == NULL && !wild_ca) { 2231 fatal("revoking certificates by key ID " 2232 "requires specification of a CA key"); 2233 } 2234 cp += 3; 2235 cp = cp + strspn(cp, " \t"); 2236 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2237 fatal("%s: revoke key ID failed", __func__); 2238 } else if (strncasecmp(cp, "hash:", 5) == 0) { 2239 cp += 5; 2240 cp = cp + strspn(cp, " \t"); 2241 hash_to_blob(cp, &blob, &blen, file, lnum); 2242 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2243 } else { 2244 if (strncasecmp(cp, "key:", 4) == 0) { 2245 cp += 4; 2246 cp = cp + strspn(cp, " \t"); 2247 was_explicit_key = 1; 2248 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2249 cp += 5; 2250 cp = cp + strspn(cp, " \t"); 2251 was_sha1 = 1; 2252 } else if (strncasecmp(cp, "sha256:", 7) == 0) { 2253 cp += 7; 2254 cp = cp + strspn(cp, " \t"); 2255 was_sha256 = 1; 2256 /* 2257 * Just try to process the line as a key. 2258 * Parsing will fail if it isn't. 2259 */ 2260 } 2261 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2262 fatal("sshkey_new"); 2263 if ((r = sshkey_read(key, &cp)) != 0) 2264 fatal("%s:%lu: invalid key: %s", 2265 path, lnum, ssh_err(r)); 2266 if (was_explicit_key) 2267 r = ssh_krl_revoke_key_explicit(krl, key); 2268 else if (was_sha1) { 2269 if (sshkey_fingerprint_raw(key, 2270 SSH_DIGEST_SHA1, &blob, &blen) != 0) { 2271 fatal("%s:%lu: fingerprint failed", 2272 file, lnum); 2273 } 2274 r = ssh_krl_revoke_key_sha1(krl, blob, blen); 2275 } else if (was_sha256) { 2276 if (sshkey_fingerprint_raw(key, 2277 SSH_DIGEST_SHA256, &blob, &blen) != 0) { 2278 fatal("%s:%lu: fingerprint failed", 2279 file, lnum); 2280 } 2281 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2282 } else 2283 r = ssh_krl_revoke_key(krl, key); 2284 if (r != 0) 2285 fatal("%s: revoke key failed: %s", 2286 __func__, ssh_err(r)); 2287 freezero(blob, blen); 2288 blob = NULL; 2289 blen = 0; 2290 sshkey_free(key); 2291 } 2292 } 2293 if (strcmp(path, "-") != 0) 2294 fclose(krl_spec); 2295 free(line); 2296 free(path); 2297 } 2298 2299 static void 2300 do_gen_krl(struct passwd *pw, int updating, int argc, char **argv) 2301 { 2302 struct ssh_krl *krl; 2303 struct stat sb; 2304 struct sshkey *ca = NULL; 2305 int fd, i, r, wild_ca = 0; 2306 char *tmp; 2307 struct sshbuf *kbuf; 2308 2309 if (*identity_file == '\0') 2310 fatal("KRL generation requires an output file"); 2311 if (stat(identity_file, &sb) == -1) { 2312 if (errno != ENOENT) 2313 fatal("Cannot access KRL \"%s\": %s", 2314 identity_file, strerror(errno)); 2315 if (updating) 2316 fatal("KRL \"%s\" does not exist", identity_file); 2317 } 2318 if (ca_key_path != NULL) { 2319 if (strcasecmp(ca_key_path, "none") == 0) 2320 wild_ca = 1; 2321 else { 2322 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2323 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 2324 fatal("Cannot load CA public key %s: %s", 2325 tmp, ssh_err(r)); 2326 free(tmp); 2327 } 2328 } 2329 2330 if (updating) 2331 load_krl(identity_file, &krl); 2332 else if ((krl = ssh_krl_init()) == NULL) 2333 fatal("couldn't create KRL"); 2334 2335 if (cert_serial != 0) 2336 ssh_krl_set_version(krl, cert_serial); 2337 if (identity_comment != NULL) 2338 ssh_krl_set_comment(krl, identity_comment); 2339 2340 for (i = 0; i < argc; i++) 2341 update_krl_from_file(pw, argv[i], wild_ca, ca, krl); 2342 2343 if ((kbuf = sshbuf_new()) == NULL) 2344 fatal("sshbuf_new failed"); 2345 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0) 2346 fatal("Couldn't generate KRL"); 2347 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2348 fatal("open %s: %s", identity_file, strerror(errno)); 2349 if (atomicio(vwrite, fd, sshbuf_mutable_ptr(kbuf), sshbuf_len(kbuf)) != 2350 sshbuf_len(kbuf)) 2351 fatal("write %s: %s", identity_file, strerror(errno)); 2352 close(fd); 2353 sshbuf_free(kbuf); 2354 ssh_krl_free(krl); 2355 sshkey_free(ca); 2356 } 2357 2358 static void 2359 do_check_krl(struct passwd *pw, int argc, char **argv) 2360 { 2361 int i, r, ret = 0; 2362 char *comment; 2363 struct ssh_krl *krl; 2364 struct sshkey *k; 2365 2366 if (*identity_file == '\0') 2367 fatal("KRL checking requires an input file"); 2368 load_krl(identity_file, &krl); 2369 for (i = 0; i < argc; i++) { 2370 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0) 2371 fatal("Cannot load public key %s: %s", 2372 argv[i], ssh_err(r)); 2373 r = ssh_krl_check_key(krl, k); 2374 printf("%s%s%s%s: %s\n", argv[i], 2375 *comment ? " (" : "", comment, *comment ? ")" : "", 2376 r == 0 ? "ok" : "REVOKED"); 2377 if (r != 0) 2378 ret = 1; 2379 sshkey_free(k); 2380 free(comment); 2381 } 2382 ssh_krl_free(krl); 2383 exit(ret); 2384 } 2385 2386 static void 2387 usage(void) 2388 { 2389 fprintf(stderr, 2390 "usage: ssh-keygen [-q] [-b bits] [-t dsa | ecdsa | ed25519 | rsa]\n" 2391 " [-N new_passphrase] [-C comment] [-f output_keyfile]\n" 2392 " ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]\n" 2393 " ssh-keygen -i [-m key_format] [-f input_keyfile]\n" 2394 " ssh-keygen -e [-m key_format] [-f input_keyfile]\n" 2395 " ssh-keygen -y [-f input_keyfile]\n" 2396 " ssh-keygen -c [-P passphrase] [-C comment] [-f keyfile]\n" 2397 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n" 2398 " ssh-keygen -B [-f input_keyfile]\n"); 2399 #ifdef ENABLE_PKCS11 2400 fprintf(stderr, 2401 " ssh-keygen -D pkcs11\n"); 2402 #endif 2403 fprintf(stderr, 2404 " ssh-keygen -F hostname [-f known_hosts_file] [-l]\n" 2405 " ssh-keygen -H [-f known_hosts_file]\n" 2406 " ssh-keygen -R hostname [-f known_hosts_file]\n" 2407 " ssh-keygen -r hostname [-f input_keyfile] [-g]\n" 2408 #ifdef WITH_OPENSSL 2409 " ssh-keygen -G output_file [-v] [-b bits] [-M memory] [-S start_point]\n" 2410 " ssh-keygen -T output_file -f input_file [-v] [-a rounds] [-J num_lines]\n" 2411 " [-j start_line] [-K checkpt] [-W generator]\n" 2412 #endif 2413 " ssh-keygen -s ca_key -I certificate_identity [-h] [-U]\n" 2414 " [-D pkcs11_provider] [-n principals] [-O option]\n" 2415 " [-V validity_interval] [-z serial_number] file ...\n" 2416 " ssh-keygen -L [-f input_keyfile]\n" 2417 " ssh-keygen -A\n" 2418 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n" 2419 " file ...\n" 2420 " ssh-keygen -Q -f krl_file file ...\n"); 2421 exit(1); 2422 } 2423 2424 /* 2425 * Main program for key management. 2426 */ 2427 int 2428 main(int argc, char **argv) 2429 { 2430 char dotsshdir[PATH_MAX], comment[1024], *passphrase1, *passphrase2; 2431 char *rr_hostname = NULL, *ep, *fp, *ra; 2432 struct sshkey *private, *public; 2433 struct passwd *pw; 2434 struct stat st; 2435 int r, opt, type, fd; 2436 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 2437 FILE *f; 2438 const char *errstr; 2439 #ifdef WITH_OPENSSL 2440 /* Moduli generation/screening */ 2441 char out_file[PATH_MAX], *checkpoint = NULL; 2442 u_int32_t memory = 0, generator_wanted = 0; 2443 int do_gen_candidates = 0, do_screen_candidates = 0; 2444 unsigned long start_lineno = 0, lines_to_process = 0; 2445 BIGNUM *start = NULL; 2446 #endif 2447 2448 extern int optind; 2449 extern char *optarg; 2450 2451 ssh_malloc_init(); /* must be called before any mallocs */ 2452 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 2453 sanitise_stdfd(); 2454 2455 __progname = ssh_get_progname(argv[0]); 2456 2457 #ifdef WITH_OPENSSL 2458 OpenSSL_add_all_algorithms(); 2459 #endif 2460 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 2461 2462 seed_rng(); 2463 2464 msetlocale(); 2465 2466 /* we need this for the home * directory. */ 2467 pw = getpwuid(getuid()); 2468 if (!pw) 2469 fatal("No user exists for uid %lu", (u_long)getuid()); 2470 if (gethostname(hostname, sizeof(hostname)) < 0) 2471 fatal("gethostname: %s", strerror(errno)); 2472 2473 /* Remaining characters: Ydw */ 2474 while ((opt = getopt(argc, argv, "ABHLQUXceghiklopquvxy" 2475 "C:D:E:F:G:I:J:K:M:N:O:P:R:S:T:V:W:Z:" 2476 "a:b:f:g:j:m:n:r:s:t:z:")) != -1) { 2477 switch (opt) { 2478 case 'A': 2479 gen_all_hostkeys = 1; 2480 break; 2481 case 'b': 2482 bits = (u_int32_t)strtonum(optarg, 10, 32768, &errstr); 2483 if (errstr) 2484 fatal("Bits has bad value %s (%s)", 2485 optarg, errstr); 2486 break; 2487 case 'E': 2488 fingerprint_hash = ssh_digest_alg_by_name(optarg); 2489 if (fingerprint_hash == -1) 2490 fatal("Invalid hash algorithm \"%s\"", optarg); 2491 break; 2492 case 'F': 2493 find_host = 1; 2494 rr_hostname = optarg; 2495 break; 2496 case 'H': 2497 hash_hosts = 1; 2498 break; 2499 case 'I': 2500 cert_key_id = optarg; 2501 break; 2502 case 'R': 2503 delete_host = 1; 2504 rr_hostname = optarg; 2505 break; 2506 case 'L': 2507 show_cert = 1; 2508 break; 2509 case 'l': 2510 print_fingerprint = 1; 2511 break; 2512 case 'B': 2513 print_bubblebabble = 1; 2514 break; 2515 case 'm': 2516 if (strcasecmp(optarg, "RFC4716") == 0 || 2517 strcasecmp(optarg, "ssh2") == 0) { 2518 convert_format = FMT_RFC4716; 2519 break; 2520 } 2521 if (strcasecmp(optarg, "PKCS8") == 0) { 2522 convert_format = FMT_PKCS8; 2523 break; 2524 } 2525 if (strcasecmp(optarg, "PEM") == 0) { 2526 convert_format = FMT_PEM; 2527 use_new_format = 0; 2528 break; 2529 } 2530 fatal("Unsupported conversion format \"%s\"", optarg); 2531 case 'n': 2532 cert_principals = optarg; 2533 break; 2534 case 'o': 2535 /* no-op; new format is already the default */ 2536 break; 2537 case 'p': 2538 change_passphrase = 1; 2539 break; 2540 case 'c': 2541 change_comment = 1; 2542 break; 2543 case 'f': 2544 if (strlcpy(identity_file, optarg, 2545 sizeof(identity_file)) >= sizeof(identity_file)) 2546 fatal("Identity filename too long"); 2547 have_identity = 1; 2548 break; 2549 case 'g': 2550 print_generic = 1; 2551 break; 2552 case 'P': 2553 identity_passphrase = optarg; 2554 break; 2555 case 'N': 2556 identity_new_passphrase = optarg; 2557 break; 2558 case 'Q': 2559 check_krl = 1; 2560 break; 2561 case 'O': 2562 add_cert_option(optarg); 2563 break; 2564 case 'Z': 2565 new_format_cipher = optarg; 2566 break; 2567 case 'C': 2568 identity_comment = optarg; 2569 break; 2570 case 'q': 2571 quiet = 1; 2572 break; 2573 case 'e': 2574 case 'x': 2575 /* export key */ 2576 convert_to = 1; 2577 break; 2578 case 'h': 2579 cert_key_type = SSH2_CERT_TYPE_HOST; 2580 certflags_flags = 0; 2581 break; 2582 case 'k': 2583 gen_krl = 1; 2584 break; 2585 case 'i': 2586 case 'X': 2587 /* import key */ 2588 convert_from = 1; 2589 break; 2590 case 'y': 2591 print_public = 1; 2592 break; 2593 case 's': 2594 ca_key_path = optarg; 2595 break; 2596 case 't': 2597 key_type_name = optarg; 2598 break; 2599 case 'D': 2600 pkcs11provider = optarg; 2601 break; 2602 case 'U': 2603 prefer_agent = 1; 2604 break; 2605 case 'u': 2606 update_krl = 1; 2607 break; 2608 case 'v': 2609 if (log_level == SYSLOG_LEVEL_INFO) 2610 log_level = SYSLOG_LEVEL_DEBUG1; 2611 else { 2612 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2613 log_level < SYSLOG_LEVEL_DEBUG3) 2614 log_level++; 2615 } 2616 break; 2617 case 'r': 2618 rr_hostname = optarg; 2619 break; 2620 case 'a': 2621 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr); 2622 if (errstr) 2623 fatal("Invalid number: %s (%s)", 2624 optarg, errstr); 2625 break; 2626 case 'V': 2627 parse_cert_times(optarg); 2628 break; 2629 case 'z': 2630 errno = 0; 2631 cert_serial = strtoull(optarg, &ep, 10); 2632 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 2633 (errno == ERANGE && cert_serial == ULLONG_MAX)) 2634 fatal("Invalid serial number \"%s\"", optarg); 2635 break; 2636 #ifdef WITH_OPENSSL 2637 /* Moduli generation/screening */ 2638 case 'G': 2639 do_gen_candidates = 1; 2640 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2641 sizeof(out_file)) 2642 fatal("Output filename too long"); 2643 break; 2644 case 'J': 2645 lines_to_process = strtoul(optarg, NULL, 10); 2646 break; 2647 case 'j': 2648 start_lineno = strtoul(optarg, NULL, 10); 2649 break; 2650 case 'K': 2651 if (strlen(optarg) >= PATH_MAX) 2652 fatal("Checkpoint filename too long"); 2653 checkpoint = xstrdup(optarg); 2654 break; 2655 case 'M': 2656 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, 2657 &errstr); 2658 if (errstr) 2659 fatal("Memory limit is %s: %s", errstr, optarg); 2660 break; 2661 case 'S': 2662 /* XXX - also compare length against bits */ 2663 if (BN_hex2bn(&start, optarg) == 0) 2664 fatal("Invalid start point."); 2665 break; 2666 case 'T': 2667 do_screen_candidates = 1; 2668 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2669 sizeof(out_file)) 2670 fatal("Output filename too long"); 2671 break; 2672 case 'W': 2673 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2674 UINT_MAX, &errstr); 2675 if (errstr != NULL) 2676 fatal("Desired generator invalid: %s (%s)", 2677 optarg, errstr); 2678 break; 2679 #endif /* WITH_OPENSSL */ 2680 case '?': 2681 default: 2682 usage(); 2683 } 2684 } 2685 2686 /* reinit */ 2687 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2688 2689 argv += optind; 2690 argc -= optind; 2691 2692 if (ca_key_path != NULL) { 2693 if (argc < 1 && !gen_krl) { 2694 error("Too few arguments."); 2695 usage(); 2696 } 2697 } else if (argc > 0 && !gen_krl && !check_krl) { 2698 error("Too many arguments."); 2699 usage(); 2700 } 2701 if (change_passphrase && change_comment) { 2702 error("Can only have one of -p and -c."); 2703 usage(); 2704 } 2705 if (print_fingerprint && (delete_host || hash_hosts)) { 2706 error("Cannot use -l with -H or -R."); 2707 usage(); 2708 } 2709 if (gen_krl) { 2710 do_gen_krl(pw, update_krl, argc, argv); 2711 return (0); 2712 } 2713 if (check_krl) { 2714 do_check_krl(pw, argc, argv); 2715 return (0); 2716 } 2717 if (ca_key_path != NULL) { 2718 if (cert_key_id == NULL) 2719 fatal("Must specify key id (-I) when certifying"); 2720 do_ca_sign(pw, argc, argv); 2721 } 2722 if (show_cert) 2723 do_show_cert(pw); 2724 if (delete_host || hash_hosts || find_host) 2725 do_known_hosts(pw, rr_hostname); 2726 if (pkcs11provider != NULL) 2727 do_download(pw); 2728 if (print_fingerprint || print_bubblebabble) 2729 do_fingerprint(pw); 2730 if (change_passphrase) 2731 do_change_passphrase(pw); 2732 if (change_comment) 2733 do_change_comment(pw); 2734 #ifdef WITH_OPENSSL 2735 if (convert_to) 2736 do_convert_to(pw); 2737 if (convert_from) 2738 do_convert_from(pw); 2739 #endif 2740 if (print_public) 2741 do_print_public(pw); 2742 if (rr_hostname != NULL) { 2743 unsigned int n = 0; 2744 2745 if (have_identity) { 2746 n = do_print_resource_record(pw, 2747 identity_file, rr_hostname); 2748 if (n == 0) 2749 fatal("%s: %s", identity_file, strerror(errno)); 2750 exit(0); 2751 } else { 2752 2753 n += do_print_resource_record(pw, 2754 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2755 n += do_print_resource_record(pw, 2756 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2757 n += do_print_resource_record(pw, 2758 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname); 2759 n += do_print_resource_record(pw, 2760 _PATH_HOST_ED25519_KEY_FILE, rr_hostname); 2761 n += do_print_resource_record(pw, 2762 _PATH_HOST_XMSS_KEY_FILE, rr_hostname); 2763 if (n == 0) 2764 fatal("no keys found."); 2765 exit(0); 2766 } 2767 } 2768 2769 #ifdef WITH_OPENSSL 2770 if (do_gen_candidates) { 2771 FILE *out = fopen(out_file, "w"); 2772 2773 if (out == NULL) { 2774 error("Couldn't open modulus candidate file \"%s\": %s", 2775 out_file, strerror(errno)); 2776 return (1); 2777 } 2778 if (bits == 0) 2779 bits = DEFAULT_BITS; 2780 if (gen_candidates(out, memory, bits, start) != 0) 2781 fatal("modulus candidate generation failed"); 2782 2783 return (0); 2784 } 2785 2786 if (do_screen_candidates) { 2787 FILE *in; 2788 FILE *out = fopen(out_file, "a"); 2789 2790 if (have_identity && strcmp(identity_file, "-") != 0) { 2791 if ((in = fopen(identity_file, "r")) == NULL) { 2792 fatal("Couldn't open modulus candidate " 2793 "file \"%s\": %s", identity_file, 2794 strerror(errno)); 2795 } 2796 } else 2797 in = stdin; 2798 2799 if (out == NULL) { 2800 fatal("Couldn't open moduli file \"%s\": %s", 2801 out_file, strerror(errno)); 2802 } 2803 if (prime_test(in, out, rounds == 0 ? 100 : rounds, 2804 generator_wanted, checkpoint, 2805 start_lineno, lines_to_process) != 0) 2806 fatal("modulus screening failed"); 2807 return (0); 2808 } 2809 #endif 2810 2811 if (gen_all_hostkeys) { 2812 do_gen_all_hostkeys(pw); 2813 return (0); 2814 } 2815 2816 if (key_type_name == NULL) 2817 key_type_name = DEFAULT_KEY_TYPE_NAME; 2818 2819 type = sshkey_type_from_name(key_type_name); 2820 type_bits_valid(type, key_type_name, &bits); 2821 2822 if (!quiet) 2823 printf("Generating public/private %s key pair.\n", 2824 key_type_name); 2825 if ((r = sshkey_generate(type, bits, &private)) != 0) 2826 fatal("sshkey_generate failed"); 2827 if ((r = sshkey_from_private(private, &public)) != 0) 2828 fatal("sshkey_from_private failed: %s\n", ssh_err(r)); 2829 2830 if (!have_identity) 2831 ask_filename(pw, "Enter file in which to save the key"); 2832 2833 /* Create ~/.ssh directory if it doesn't already exist. */ 2834 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2835 pw->pw_dir, _PATH_SSH_USER_DIR); 2836 if (strstr(identity_file, dotsshdir) != NULL) { 2837 if (stat(dotsshdir, &st) < 0) { 2838 if (errno != ENOENT) { 2839 error("Could not stat %s: %s", dotsshdir, 2840 strerror(errno)); 2841 } else if (mkdir(dotsshdir, 0700) < 0) { 2842 error("Could not create directory '%s': %s", 2843 dotsshdir, strerror(errno)); 2844 } else if (!quiet) 2845 printf("Created directory '%s'.\n", dotsshdir); 2846 } 2847 } 2848 /* If the file already exists, ask the user to confirm. */ 2849 if (stat(identity_file, &st) >= 0) { 2850 char yesno[3]; 2851 printf("%s already exists.\n", identity_file); 2852 printf("Overwrite (y/n)? "); 2853 fflush(stdout); 2854 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2855 exit(1); 2856 if (yesno[0] != 'y' && yesno[0] != 'Y') 2857 exit(1); 2858 } 2859 /* Ask for a passphrase (twice). */ 2860 if (identity_passphrase) 2861 passphrase1 = xstrdup(identity_passphrase); 2862 else if (identity_new_passphrase) 2863 passphrase1 = xstrdup(identity_new_passphrase); 2864 else { 2865 passphrase_again: 2866 passphrase1 = 2867 read_passphrase("Enter passphrase (empty for no " 2868 "passphrase): ", RP_ALLOW_STDIN); 2869 passphrase2 = read_passphrase("Enter same passphrase again: ", 2870 RP_ALLOW_STDIN); 2871 if (strcmp(passphrase1, passphrase2) != 0) { 2872 /* 2873 * The passphrases do not match. Clear them and 2874 * retry. 2875 */ 2876 explicit_bzero(passphrase1, strlen(passphrase1)); 2877 explicit_bzero(passphrase2, strlen(passphrase2)); 2878 free(passphrase1); 2879 free(passphrase2); 2880 printf("Passphrases do not match. Try again.\n"); 2881 goto passphrase_again; 2882 } 2883 /* Clear the other copy of the passphrase. */ 2884 explicit_bzero(passphrase2, strlen(passphrase2)); 2885 free(passphrase2); 2886 } 2887 2888 if (identity_comment) { 2889 strlcpy(comment, identity_comment, sizeof(comment)); 2890 } else { 2891 /* Create default comment field for the passphrase. */ 2892 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2893 } 2894 2895 /* Save the key with the given passphrase and comment. */ 2896 if ((r = sshkey_save_private(private, identity_file, passphrase1, 2897 comment, use_new_format, new_format_cipher, rounds)) != 0) { 2898 error("Saving key \"%s\" failed: %s", 2899 identity_file, ssh_err(r)); 2900 explicit_bzero(passphrase1, strlen(passphrase1)); 2901 free(passphrase1); 2902 exit(1); 2903 } 2904 /* Clear the passphrase. */ 2905 explicit_bzero(passphrase1, strlen(passphrase1)); 2906 free(passphrase1); 2907 2908 /* Clear the private key and the random number generator. */ 2909 sshkey_free(private); 2910 2911 if (!quiet) 2912 printf("Your identification has been saved in %s.\n", identity_file); 2913 2914 strlcat(identity_file, ".pub", sizeof(identity_file)); 2915 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2916 fatal("Unable to save public key to %s: %s", 2917 identity_file, strerror(errno)); 2918 if ((f = fdopen(fd, "w")) == NULL) 2919 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 2920 if ((r = sshkey_write(public, f)) != 0) 2921 error("write key failed: %s", ssh_err(r)); 2922 fprintf(f, " %s\n", comment); 2923 if (ferror(f) || fclose(f) != 0) 2924 fatal("write public failed: %s", strerror(errno)); 2925 2926 if (!quiet) { 2927 fp = sshkey_fingerprint(public, fingerprint_hash, 2928 SSH_FP_DEFAULT); 2929 ra = sshkey_fingerprint(public, fingerprint_hash, 2930 SSH_FP_RANDOMART); 2931 if (fp == NULL || ra == NULL) 2932 fatal("sshkey_fingerprint failed"); 2933 printf("Your public key has been saved in %s.\n", 2934 identity_file); 2935 printf("The key fingerprint is:\n"); 2936 printf("%s %s\n", fp, comment); 2937 printf("The key's randomart image is:\n"); 2938 printf("%s\n", ra); 2939 free(ra); 2940 free(fp); 2941 } 2942 2943 sshkey_free(public); 2944 exit(0); 2945 } 2946