1 /* $OpenBSD: ssh-keygen.c,v 1.313 2018/02/23 15:58:38 markus 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 <sys/types.h> 16 #include <sys/socket.h> 17 #include <sys/stat.h> 18 19 #include <openssl/evp.h> 20 #include <openssl/pem.h> 21 22 #include <errno.h> 23 #include <fcntl.h> 24 #include <netdb.h> 25 #include <pwd.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <unistd.h> 30 #include <limits.h> 31 #include <locale.h> 32 33 #include "xmalloc.h" 34 #include "sshkey.h" 35 #include "authfile.h" 36 #include "uuencode.h" 37 #include "sshbuf.h" 38 #include "pathnames.h" 39 #include "log.h" 40 #include "misc.h" 41 #include "match.h" 42 #include "hostfile.h" 43 #include "dns.h" 44 #include "ssh.h" 45 #include "ssh2.h" 46 #include "ssherr.h" 47 #include "atomicio.h" 48 #include "krl.h" 49 #include "digest.h" 50 #include "utf8.h" 51 #include "authfd.h" 52 53 #ifdef ENABLE_PKCS11 54 #include "ssh-pkcs11.h" 55 #endif 56 57 #ifdef WITH_OPENSSL 58 # define DEFAULT_KEY_TYPE_NAME "rsa" 59 #else 60 # define DEFAULT_KEY_TYPE_NAME "ed25519" 61 #endif 62 63 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */ 64 #define DEFAULT_BITS 2048 65 #define DEFAULT_BITS_DSA 1024 66 #define DEFAULT_BITS_ECDSA 256 67 u_int32_t bits = 0; 68 69 /* 70 * Flag indicating that we just want to change the passphrase. This can be 71 * set on the command line. 72 */ 73 int change_passphrase = 0; 74 75 /* 76 * Flag indicating that we just want to change the comment. This can be set 77 * on the command line. 78 */ 79 int change_comment = 0; 80 81 int quiet = 0; 82 83 int log_level = SYSLOG_LEVEL_INFO; 84 85 /* Flag indicating that we want to hash a known_hosts file */ 86 int hash_hosts = 0; 87 /* Flag indicating that we want lookup a host in known_hosts file */ 88 int find_host = 0; 89 /* Flag indicating that we want to delete a host from a known_hosts file */ 90 int delete_host = 0; 91 92 /* Flag indicating that we want to show the contents of a certificate */ 93 int show_cert = 0; 94 95 /* Flag indicating that we just want to see the key fingerprint */ 96 int print_fingerprint = 0; 97 int print_bubblebabble = 0; 98 99 /* Hash algorithm to use for fingerprints. */ 100 int fingerprint_hash = SSH_FP_HASH_DEFAULT; 101 102 /* The identity file name, given on the command line or entered by the user. */ 103 char identity_file[1024]; 104 int have_identity = 0; 105 106 /* This is set to the passphrase if given on the command line. */ 107 char *identity_passphrase = NULL; 108 109 /* This is set to the new passphrase if given on the command line. */ 110 char *identity_new_passphrase = NULL; 111 112 /* This is set to the new comment if given on the command line. */ 113 char *identity_comment = NULL; 114 115 /* Path to CA key when certifying keys. */ 116 char *ca_key_path = NULL; 117 118 /* Prefer to use agent keys for CA signing */ 119 int prefer_agent = 0; 120 121 /* Certificate serial number */ 122 unsigned long long cert_serial = 0; 123 124 /* Key type when certifying */ 125 u_int cert_key_type = SSH2_CERT_TYPE_USER; 126 127 /* "key ID" of signed key */ 128 char *cert_key_id = NULL; 129 130 /* Comma-separated list of principal names for certifying keys */ 131 char *cert_principals = NULL; 132 133 /* Validity period for certificates */ 134 u_int64_t cert_valid_from = 0; 135 u_int64_t cert_valid_to = ~0ULL; 136 137 /* Certificate options */ 138 #define CERTOPT_X_FWD (1) 139 #define CERTOPT_AGENT_FWD (1<<1) 140 #define CERTOPT_PORT_FWD (1<<2) 141 #define CERTOPT_PTY (1<<3) 142 #define CERTOPT_USER_RC (1<<4) 143 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 144 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 145 u_int32_t certflags_flags = CERTOPT_DEFAULT; 146 char *certflags_command = NULL; 147 char *certflags_src_addr = NULL; 148 149 /* Arbitrary extensions specified by user */ 150 struct cert_userext { 151 char *key; 152 char *val; 153 int crit; 154 }; 155 struct cert_userext *cert_userext; 156 size_t ncert_userext; 157 158 /* Conversion to/from various formats */ 159 int convert_to = 0; 160 int convert_from = 0; 161 enum { 162 FMT_RFC4716, 163 FMT_PKCS8, 164 FMT_PEM 165 } convert_format = FMT_RFC4716; 166 int print_public = 0; 167 int print_generic = 0; 168 169 char *key_type_name = NULL; 170 171 /* Load key from this PKCS#11 provider */ 172 char *pkcs11provider = NULL; 173 174 /* Use new OpenSSH private key format when writing SSH2 keys instead of PEM */ 175 int use_new_format = 0; 176 177 /* Cipher for new-format private keys */ 178 char *new_format_cipher = NULL; 179 180 /* 181 * Number of KDF rounds to derive new format keys / 182 * number of primality trials when screening moduli. 183 */ 184 int rounds = 0; 185 186 /* argv0 */ 187 extern char *__progname; 188 189 char hostname[NI_MAXHOST]; 190 191 #ifdef WITH_OPENSSL 192 /* moduli.c */ 193 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 194 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 195 unsigned long); 196 #endif 197 198 static void 199 type_bits_valid(int type, const char *name, u_int32_t *bitsp) 200 { 201 #ifdef WITH_OPENSSL 202 u_int maxbits, nid; 203 #endif 204 205 if (type == KEY_UNSPEC) 206 fatal("unknown key type %s", key_type_name); 207 if (*bitsp == 0) { 208 #ifdef WITH_OPENSSL 209 if (type == KEY_DSA) 210 *bitsp = DEFAULT_BITS_DSA; 211 else if (type == KEY_ECDSA) { 212 if (name != NULL && 213 (nid = sshkey_ecdsa_nid_from_name(name)) > 0) 214 *bitsp = sshkey_curve_nid_to_bits(nid); 215 if (*bitsp == 0) 216 *bitsp = DEFAULT_BITS_ECDSA; 217 } else 218 #endif 219 *bitsp = DEFAULT_BITS; 220 } 221 #ifdef WITH_OPENSSL 222 maxbits = (type == KEY_DSA) ? 223 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 224 if (*bitsp > maxbits) 225 fatal("key bits exceeds maximum %d", maxbits); 226 switch (type) { 227 case KEY_DSA: 228 if (*bitsp != 1024) 229 fatal("Invalid DSA key length: must be 1024 bits"); 230 break; 231 case KEY_RSA: 232 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE) 233 fatal("Invalid RSA key length: minimum is %d bits", 234 SSH_RSA_MINIMUM_MODULUS_SIZE); 235 break; 236 case KEY_ECDSA: 237 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1) 238 fatal("Invalid ECDSA key length: valid lengths are " 239 "256, 384 or 521 bits"); 240 } 241 #endif 242 } 243 244 static void 245 ask_filename(struct passwd *pw, const char *prompt) 246 { 247 char buf[1024]; 248 char *name = NULL; 249 250 if (key_type_name == NULL) 251 name = _PATH_SSH_CLIENT_ID_RSA; 252 else { 253 switch (sshkey_type_from_name(key_type_name)) { 254 case KEY_DSA_CERT: 255 case KEY_DSA: 256 name = _PATH_SSH_CLIENT_ID_DSA; 257 break; 258 case KEY_ECDSA_CERT: 259 case KEY_ECDSA: 260 name = _PATH_SSH_CLIENT_ID_ECDSA; 261 break; 262 case KEY_RSA_CERT: 263 case KEY_RSA: 264 name = _PATH_SSH_CLIENT_ID_RSA; 265 break; 266 case KEY_ED25519: 267 case KEY_ED25519_CERT: 268 name = _PATH_SSH_CLIENT_ID_ED25519; 269 break; 270 case KEY_XMSS: 271 case KEY_XMSS_CERT: 272 name = _PATH_SSH_CLIENT_ID_XMSS; 273 break; 274 default: 275 fatal("bad key type"); 276 } 277 } 278 snprintf(identity_file, sizeof(identity_file), 279 "%s/%s", pw->pw_dir, name); 280 printf("%s (%s): ", prompt, identity_file); 281 fflush(stdout); 282 if (fgets(buf, sizeof(buf), stdin) == NULL) 283 exit(1); 284 buf[strcspn(buf, "\n")] = '\0'; 285 if (strcmp(buf, "") != 0) 286 strlcpy(identity_file, buf, sizeof(identity_file)); 287 have_identity = 1; 288 } 289 290 static struct sshkey * 291 load_identity(char *filename) 292 { 293 char *pass; 294 struct sshkey *prv; 295 int r; 296 297 if ((r = sshkey_load_private(filename, "", &prv, NULL)) == 0) 298 return prv; 299 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 300 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 301 if (identity_passphrase) 302 pass = xstrdup(identity_passphrase); 303 else 304 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN); 305 r = sshkey_load_private(filename, pass, &prv, NULL); 306 explicit_bzero(pass, strlen(pass)); 307 free(pass); 308 if (r != 0) 309 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 310 return prv; 311 } 312 313 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 314 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 315 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 316 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 317 318 #ifdef WITH_OPENSSL 319 static void 320 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k) 321 { 322 size_t len; 323 u_char *blob; 324 char comment[61]; 325 int r; 326 327 if ((r = sshkey_to_blob(k, &blob, &len)) != 0) 328 fatal("key_to_blob failed: %s", ssh_err(r)); 329 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 330 snprintf(comment, sizeof(comment), 331 "%u-bit %s, converted by %s@%s from OpenSSH", 332 sshkey_size(k), sshkey_type(k), 333 pw->pw_name, hostname); 334 335 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 336 fprintf(stdout, "Comment: \"%s\"\n", comment); 337 dump_base64(stdout, blob, len); 338 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 339 sshkey_free(k); 340 free(blob); 341 exit(0); 342 } 343 344 static void 345 do_convert_to_pkcs8(struct sshkey *k) 346 { 347 switch (sshkey_type_plain(k->type)) { 348 case KEY_RSA: 349 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 350 fatal("PEM_write_RSA_PUBKEY failed"); 351 break; 352 case KEY_DSA: 353 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 354 fatal("PEM_write_DSA_PUBKEY failed"); 355 break; 356 case KEY_ECDSA: 357 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 358 fatal("PEM_write_EC_PUBKEY failed"); 359 break; 360 default: 361 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 362 } 363 exit(0); 364 } 365 366 static void 367 do_convert_to_pem(struct sshkey *k) 368 { 369 switch (sshkey_type_plain(k->type)) { 370 case KEY_RSA: 371 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 372 fatal("PEM_write_RSAPublicKey failed"); 373 break; 374 default: 375 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 376 } 377 exit(0); 378 } 379 380 static void 381 do_convert_to(struct passwd *pw) 382 { 383 struct sshkey *k; 384 struct stat st; 385 int r; 386 387 if (!have_identity) 388 ask_filename(pw, "Enter file in which the key is"); 389 if (stat(identity_file, &st) < 0) 390 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 391 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0) 392 k = load_identity(identity_file); 393 switch (convert_format) { 394 case FMT_RFC4716: 395 do_convert_to_ssh2(pw, k); 396 break; 397 case FMT_PKCS8: 398 do_convert_to_pkcs8(k); 399 break; 400 case FMT_PEM: 401 do_convert_to_pem(k); 402 break; 403 default: 404 fatal("%s: unknown key format %d", __func__, convert_format); 405 } 406 exit(0); 407 } 408 409 /* 410 * This is almost exactly the bignum1 encoding, but with 32 bit for length 411 * instead of 16. 412 */ 413 static void 414 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value) 415 { 416 u_int bytes, bignum_bits; 417 int r; 418 419 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0) 420 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 421 bytes = (bignum_bits + 7) / 8; 422 if (sshbuf_len(b) < bytes) 423 fatal("%s: input buffer too small: need %d have %zu", 424 __func__, bytes, sshbuf_len(b)); 425 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL) 426 fatal("%s: BN_bin2bn failed", __func__); 427 if ((r = sshbuf_consume(b, bytes)) != 0) 428 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 429 } 430 431 static struct sshkey * 432 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 433 { 434 struct sshbuf *b; 435 struct sshkey *key = NULL; 436 char *type, *cipher; 437 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345"; 438 int r, rlen, ktype; 439 u_int magic, i1, i2, i3, i4; 440 size_t slen; 441 u_long e; 442 443 if ((b = sshbuf_from(blob, blen)) == NULL) 444 fatal("%s: sshbuf_from failed", __func__); 445 if ((r = sshbuf_get_u32(b, &magic)) != 0) 446 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 447 448 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 449 error("bad magic 0x%x != 0x%x", magic, 450 SSH_COM_PRIVATE_KEY_MAGIC); 451 sshbuf_free(b); 452 return NULL; 453 } 454 if ((r = sshbuf_get_u32(b, &i1)) != 0 || 455 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 456 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 || 457 (r = sshbuf_get_u32(b, &i2)) != 0 || 458 (r = sshbuf_get_u32(b, &i3)) != 0 || 459 (r = sshbuf_get_u32(b, &i4)) != 0) 460 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 461 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 462 if (strcmp(cipher, "none") != 0) { 463 error("unsupported cipher %s", cipher); 464 free(cipher); 465 sshbuf_free(b); 466 free(type); 467 return NULL; 468 } 469 free(cipher); 470 471 if (strstr(type, "dsa")) { 472 ktype = KEY_DSA; 473 } else if (strstr(type, "rsa")) { 474 ktype = KEY_RSA; 475 } else { 476 sshbuf_free(b); 477 free(type); 478 return NULL; 479 } 480 if ((key = sshkey_new_private(ktype)) == NULL) 481 fatal("sshkey_new_private failed"); 482 free(type); 483 484 switch (key->type) { 485 case KEY_DSA: 486 buffer_get_bignum_bits(b, key->dsa->p); 487 buffer_get_bignum_bits(b, key->dsa->g); 488 buffer_get_bignum_bits(b, key->dsa->q); 489 buffer_get_bignum_bits(b, key->dsa->pub_key); 490 buffer_get_bignum_bits(b, key->dsa->priv_key); 491 break; 492 case KEY_RSA: 493 if ((r = sshbuf_get_u8(b, &e1)) != 0 || 494 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) || 495 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0)) 496 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 497 e = e1; 498 debug("e %lx", e); 499 if (e < 30) { 500 e <<= 8; 501 e += e2; 502 debug("e %lx", e); 503 e <<= 8; 504 e += e3; 505 debug("e %lx", e); 506 } 507 if (!BN_set_word(key->rsa->e, e)) { 508 sshbuf_free(b); 509 sshkey_free(key); 510 return NULL; 511 } 512 buffer_get_bignum_bits(b, key->rsa->d); 513 buffer_get_bignum_bits(b, key->rsa->n); 514 buffer_get_bignum_bits(b, key->rsa->iqmp); 515 buffer_get_bignum_bits(b, key->rsa->q); 516 buffer_get_bignum_bits(b, key->rsa->p); 517 if ((r = ssh_rsa_generate_additional_parameters(key)) != 0) 518 fatal("generate RSA parameters failed: %s", ssh_err(r)); 519 break; 520 } 521 rlen = sshbuf_len(b); 522 if (rlen != 0) 523 error("do_convert_private_ssh2_from_blob: " 524 "remaining bytes in key blob %d", rlen); 525 sshbuf_free(b); 526 527 /* try the key */ 528 if (sshkey_sign(key, &sig, &slen, data, sizeof(data), NULL, 0) != 0 || 529 sshkey_verify(key, sig, slen, data, sizeof(data), NULL, 0) != 0) { 530 sshkey_free(key); 531 free(sig); 532 return NULL; 533 } 534 free(sig); 535 return key; 536 } 537 538 static int 539 get_line(FILE *fp, char *line, size_t len) 540 { 541 int c; 542 size_t pos = 0; 543 544 line[0] = '\0'; 545 while ((c = fgetc(fp)) != EOF) { 546 if (pos >= len - 1) 547 fatal("input line too long."); 548 switch (c) { 549 case '\r': 550 c = fgetc(fp); 551 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) 552 fatal("unget: %s", strerror(errno)); 553 return pos; 554 case '\n': 555 return pos; 556 } 557 line[pos++] = c; 558 line[pos] = '\0'; 559 } 560 /* We reached EOF */ 561 return -1; 562 } 563 564 static void 565 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private) 566 { 567 int r, blen, escaped = 0; 568 u_int len; 569 char line[1024]; 570 u_char blob[8096]; 571 char encoded[8096]; 572 FILE *fp; 573 574 if ((fp = fopen(identity_file, "r")) == NULL) 575 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 576 encoded[0] = '\0'; 577 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 578 if (blen > 0 && line[blen - 1] == '\\') 579 escaped++; 580 if (strncmp(line, "----", 4) == 0 || 581 strstr(line, ": ") != NULL) { 582 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 583 *private = 1; 584 if (strstr(line, " END ") != NULL) { 585 break; 586 } 587 /* fprintf(stderr, "ignore: %s", line); */ 588 continue; 589 } 590 if (escaped) { 591 escaped--; 592 /* fprintf(stderr, "escaped: %s", line); */ 593 continue; 594 } 595 strlcat(encoded, line, sizeof(encoded)); 596 } 597 len = strlen(encoded); 598 if (((len % 4) == 3) && 599 (encoded[len-1] == '=') && 600 (encoded[len-2] == '=') && 601 (encoded[len-3] == '=')) 602 encoded[len-3] = '\0'; 603 blen = uudecode(encoded, blob, sizeof(blob)); 604 if (blen < 0) 605 fatal("uudecode failed."); 606 if (*private) 607 *k = do_convert_private_ssh2_from_blob(blob, blen); 608 else if ((r = sshkey_from_blob(blob, blen, k)) != 0) 609 fatal("decode blob failed: %s", ssh_err(r)); 610 fclose(fp); 611 } 612 613 static void 614 do_convert_from_pkcs8(struct sshkey **k, int *private) 615 { 616 EVP_PKEY *pubkey; 617 FILE *fp; 618 619 if ((fp = fopen(identity_file, "r")) == NULL) 620 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 621 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 622 fatal("%s: %s is not a recognised public key format", __func__, 623 identity_file); 624 } 625 fclose(fp); 626 switch (EVP_PKEY_type(pubkey->type)) { 627 case EVP_PKEY_RSA: 628 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 629 fatal("sshkey_new failed"); 630 (*k)->type = KEY_RSA; 631 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 632 break; 633 case EVP_PKEY_DSA: 634 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 635 fatal("sshkey_new failed"); 636 (*k)->type = KEY_DSA; 637 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 638 break; 639 case EVP_PKEY_EC: 640 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 641 fatal("sshkey_new failed"); 642 (*k)->type = KEY_ECDSA; 643 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 644 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa); 645 break; 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; 659 660 if ((fp = fopen(identity_file, "r")) == NULL) 661 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 662 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 663 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 664 fatal("sshkey_new failed"); 665 (*k)->type = KEY_RSA; 666 (*k)->rsa = rsa; 667 fclose(fp); 668 return; 669 } 670 fatal("%s: unrecognised raw private key format", __func__); 671 } 672 673 static void 674 do_convert_from(struct passwd *pw) 675 { 676 struct sshkey *k = NULL; 677 int r, private = 0, ok = 0; 678 struct stat st; 679 680 if (!have_identity) 681 ask_filename(pw, "Enter file in which the key is"); 682 if (stat(identity_file, &st) < 0) 683 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 684 685 switch (convert_format) { 686 case FMT_RFC4716: 687 do_convert_from_ssh2(pw, &k, &private); 688 break; 689 case FMT_PKCS8: 690 do_convert_from_pkcs8(&k, &private); 691 break; 692 case FMT_PEM: 693 do_convert_from_pem(&k, &private); 694 break; 695 default: 696 fatal("%s: unknown key format %d", __func__, convert_format); 697 } 698 699 if (!private) { 700 if ((r = sshkey_write(k, stdout)) == 0) 701 ok = 1; 702 if (ok) 703 fprintf(stdout, "\n"); 704 } else { 705 switch (k->type) { 706 case KEY_DSA: 707 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 708 NULL, 0, NULL, NULL); 709 break; 710 case KEY_ECDSA: 711 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 712 NULL, 0, NULL, NULL); 713 break; 714 case KEY_RSA: 715 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 716 NULL, 0, NULL, NULL); 717 break; 718 default: 719 fatal("%s: unsupported key type %s", __func__, 720 sshkey_type(k)); 721 } 722 } 723 724 if (!ok) 725 fatal("key write failed"); 726 sshkey_free(k); 727 exit(0); 728 } 729 #endif 730 731 static void 732 do_print_public(struct passwd *pw) 733 { 734 struct sshkey *prv; 735 struct stat st; 736 int r; 737 738 if (!have_identity) 739 ask_filename(pw, "Enter file in which the key is"); 740 if (stat(identity_file, &st) < 0) 741 fatal("%s: %s", identity_file, strerror(errno)); 742 prv = load_identity(identity_file); 743 if ((r = sshkey_write(prv, stdout)) != 0) 744 error("sshkey_write failed: %s", ssh_err(r)); 745 sshkey_free(prv); 746 fprintf(stdout, "\n"); 747 exit(0); 748 } 749 750 static void 751 do_download(struct passwd *pw) 752 { 753 #ifdef ENABLE_PKCS11 754 struct sshkey **keys = NULL; 755 int i, nkeys; 756 enum sshkey_fp_rep rep; 757 int fptype; 758 char *fp, *ra; 759 760 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 761 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 762 763 pkcs11_init(0); 764 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 765 if (nkeys <= 0) 766 fatal("cannot read public key from pkcs11"); 767 for (i = 0; i < nkeys; i++) { 768 if (print_fingerprint) { 769 fp = sshkey_fingerprint(keys[i], fptype, rep); 770 ra = sshkey_fingerprint(keys[i], fingerprint_hash, 771 SSH_FP_RANDOMART); 772 if (fp == NULL || ra == NULL) 773 fatal("%s: sshkey_fingerprint fail", __func__); 774 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]), 775 fp, sshkey_type(keys[i])); 776 if (log_level >= SYSLOG_LEVEL_VERBOSE) 777 printf("%s\n", ra); 778 free(ra); 779 free(fp); 780 } else { 781 (void) sshkey_write(keys[i], stdout); /* XXX check */ 782 fprintf(stdout, "\n"); 783 } 784 sshkey_free(keys[i]); 785 } 786 free(keys); 787 pkcs11_terminate(); 788 exit(0); 789 #else 790 fatal("no pkcs11 support"); 791 #endif /* ENABLE_PKCS11 */ 792 } 793 794 static struct sshkey * 795 try_read_key(char **cpp) 796 { 797 struct sshkey *ret; 798 int r; 799 800 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL) 801 fatal("sshkey_new failed"); 802 if ((r = sshkey_read(ret, cpp)) == 0) 803 return ret; 804 /* Not a key */ 805 sshkey_free(ret); 806 return NULL; 807 } 808 809 static void 810 fingerprint_one_key(const struct sshkey *public, const char *comment) 811 { 812 char *fp = NULL, *ra = NULL; 813 enum sshkey_fp_rep rep; 814 int fptype; 815 816 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 817 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 818 fp = sshkey_fingerprint(public, fptype, rep); 819 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART); 820 if (fp == NULL || ra == NULL) 821 fatal("%s: sshkey_fingerprint failed", __func__); 822 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp, 823 comment ? comment : "no comment", sshkey_type(public)); 824 if (log_level >= SYSLOG_LEVEL_VERBOSE) 825 printf("%s\n", ra); 826 free(ra); 827 free(fp); 828 } 829 830 static void 831 fingerprint_private(const char *path) 832 { 833 struct stat st; 834 char *comment = NULL; 835 struct sshkey *public = NULL; 836 int r; 837 838 if (stat(identity_file, &st) < 0) 839 fatal("%s: %s", path, strerror(errno)); 840 if ((r = sshkey_load_public(path, &public, &comment)) != 0) { 841 debug("load public \"%s\": %s", path, ssh_err(r)); 842 if ((r = sshkey_load_private(path, NULL, 843 &public, &comment)) != 0) { 844 debug("load private \"%s\": %s", path, ssh_err(r)); 845 fatal("%s is not a key file.", path); 846 } 847 } 848 849 fingerprint_one_key(public, comment); 850 sshkey_free(public); 851 free(comment); 852 } 853 854 static void 855 do_fingerprint(struct passwd *pw) 856 { 857 FILE *f; 858 struct sshkey *public = NULL; 859 char *comment = NULL, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES]; 860 int i, invalid = 1; 861 const char *path; 862 u_long lnum = 0; 863 864 if (!have_identity) 865 ask_filename(pw, "Enter file in which the key is"); 866 path = identity_file; 867 868 if (strcmp(identity_file, "-") == 0) { 869 f = stdin; 870 path = "(stdin)"; 871 } else if ((f = fopen(path, "r")) == NULL) 872 fatal("%s: %s: %s", __progname, path, strerror(errno)); 873 874 while (read_keyfile_line(f, path, line, sizeof(line), &lnum) == 0) { 875 cp = line; 876 cp[strcspn(cp, "\n")] = '\0'; 877 /* Trim leading space and comments */ 878 cp = line + strspn(line, " \t"); 879 if (*cp == '#' || *cp == '\0') 880 continue; 881 882 /* 883 * Input may be plain keys, private keys, authorized_keys 884 * or known_hosts. 885 */ 886 887 /* 888 * Try private keys first. Assume a key is private if 889 * "SSH PRIVATE KEY" appears on the first line and we're 890 * not reading from stdin (XXX support private keys on stdin). 891 */ 892 if (lnum == 1 && strcmp(identity_file, "-") != 0 && 893 strstr(cp, "PRIVATE KEY") != NULL) { 894 fclose(f); 895 fingerprint_private(path); 896 exit(0); 897 } 898 899 /* 900 * If it's not a private key, then this must be prepared to 901 * accept a public key prefixed with a hostname or options. 902 * Try a bare key first, otherwise skip the leading stuff. 903 */ 904 if ((public = try_read_key(&cp)) == NULL) { 905 i = strtol(cp, &ep, 10); 906 if (i == 0 || ep == NULL || 907 (*ep != ' ' && *ep != '\t')) { 908 int quoted = 0; 909 910 comment = cp; 911 for (; *cp && (quoted || (*cp != ' ' && 912 *cp != '\t')); cp++) { 913 if (*cp == '\\' && cp[1] == '"') 914 cp++; /* Skip both */ 915 else if (*cp == '"') 916 quoted = !quoted; 917 } 918 if (!*cp) 919 continue; 920 *cp++ = '\0'; 921 } 922 } 923 /* Retry after parsing leading hostname/key options */ 924 if (public == NULL && (public = try_read_key(&cp)) == NULL) { 925 debug("%s:%lu: not a public key", path, lnum); 926 continue; 927 } 928 929 /* Find trailing comment, if any */ 930 for (; *cp == ' ' || *cp == '\t'; cp++) 931 ; 932 if (*cp != '\0' && *cp != '#') 933 comment = cp; 934 935 fingerprint_one_key(public, comment); 936 sshkey_free(public); 937 invalid = 0; /* One good key in the file is sufficient */ 938 } 939 fclose(f); 940 941 if (invalid) 942 fatal("%s is not a public key file.", path); 943 exit(0); 944 } 945 946 static void 947 do_gen_all_hostkeys(struct passwd *pw) 948 { 949 struct { 950 char *key_type; 951 char *key_type_display; 952 char *path; 953 } key_types[] = { 954 #ifdef WITH_OPENSSL 955 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 956 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 957 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 958 #endif /* WITH_OPENSSL */ 959 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE }, 960 #ifdef WITH_XMSS 961 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE }, 962 #endif /* WITH_XMSS */ 963 { NULL, NULL, NULL } 964 }; 965 966 int first = 0; 967 struct stat st; 968 struct sshkey *private, *public; 969 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file; 970 int i, type, fd, r; 971 FILE *f; 972 973 for (i = 0; key_types[i].key_type; i++) { 974 public = private = NULL; 975 prv_tmp = pub_tmp = prv_file = pub_file = NULL; 976 977 xasprintf(&prv_file, "%s%s", 978 identity_file, key_types[i].path); 979 980 /* Check whether private key exists and is not zero-length */ 981 if (stat(prv_file, &st) == 0) { 982 if (st.st_size != 0) 983 goto next; 984 } else if (errno != ENOENT) { 985 error("Could not stat %s: %s", key_types[i].path, 986 strerror(errno)); 987 goto failnext; 988 } 989 990 /* 991 * Private key doesn't exist or is invalid; proceed with 992 * key generation. 993 */ 994 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX", 995 identity_file, key_types[i].path); 996 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX", 997 identity_file, key_types[i].path); 998 xasprintf(&pub_file, "%s%s.pub", 999 identity_file, key_types[i].path); 1000 1001 if (first == 0) { 1002 first = 1; 1003 printf("%s: generating new host keys: ", __progname); 1004 } 1005 printf("%s ", key_types[i].key_type_display); 1006 fflush(stdout); 1007 type = sshkey_type_from_name(key_types[i].key_type); 1008 if ((fd = mkstemp(prv_tmp)) == -1) { 1009 error("Could not save your public key in %s: %s", 1010 prv_tmp, strerror(errno)); 1011 goto failnext; 1012 } 1013 close(fd); /* just using mkstemp() to generate/reserve a name */ 1014 bits = 0; 1015 type_bits_valid(type, NULL, &bits); 1016 if ((r = sshkey_generate(type, bits, &private)) != 0) { 1017 error("sshkey_generate failed: %s", ssh_err(r)); 1018 goto failnext; 1019 } 1020 if ((r = sshkey_from_private(private, &public)) != 0) 1021 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1022 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 1023 hostname); 1024 if ((r = sshkey_save_private(private, prv_tmp, "", 1025 comment, use_new_format, new_format_cipher, rounds)) != 0) { 1026 error("Saving key \"%s\" failed: %s", 1027 prv_tmp, ssh_err(r)); 1028 goto failnext; 1029 } 1030 if ((fd = mkstemp(pub_tmp)) == -1) { 1031 error("Could not save your public key in %s: %s", 1032 pub_tmp, strerror(errno)); 1033 goto failnext; 1034 } 1035 (void)fchmod(fd, 0644); 1036 f = fdopen(fd, "w"); 1037 if (f == NULL) { 1038 error("fdopen %s failed: %s", pub_tmp, strerror(errno)); 1039 close(fd); 1040 goto failnext; 1041 } 1042 if ((r = sshkey_write(public, f)) != 0) { 1043 error("write key failed: %s", ssh_err(r)); 1044 fclose(f); 1045 goto failnext; 1046 } 1047 fprintf(f, " %s\n", comment); 1048 if (ferror(f) != 0) { 1049 error("write key failed: %s", strerror(errno)); 1050 fclose(f); 1051 goto failnext; 1052 } 1053 if (fclose(f) != 0) { 1054 error("key close failed: %s", strerror(errno)); 1055 goto failnext; 1056 } 1057 1058 /* Rename temporary files to their permanent locations. */ 1059 if (rename(pub_tmp, pub_file) != 0) { 1060 error("Unable to move %s into position: %s", 1061 pub_file, strerror(errno)); 1062 goto failnext; 1063 } 1064 if (rename(prv_tmp, prv_file) != 0) { 1065 error("Unable to move %s into position: %s", 1066 key_types[i].path, strerror(errno)); 1067 failnext: 1068 first = 0; 1069 goto next; 1070 } 1071 next: 1072 sshkey_free(private); 1073 sshkey_free(public); 1074 free(prv_tmp); 1075 free(pub_tmp); 1076 free(prv_file); 1077 free(pub_file); 1078 } 1079 if (first != 0) 1080 printf("\n"); 1081 } 1082 1083 struct known_hosts_ctx { 1084 const char *host; /* Hostname searched for in find/delete case */ 1085 FILE *out; /* Output file, stdout for find_hosts case */ 1086 int has_unhashed; /* When hashing, original had unhashed hosts */ 1087 int found_key; /* For find/delete, host was found */ 1088 int invalid; /* File contained invalid items; don't delete */ 1089 }; 1090 1091 static int 1092 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx) 1093 { 1094 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1095 char *hashed, *cp, *hosts, *ohosts; 1096 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts); 1097 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM; 1098 1099 switch (l->status) { 1100 case HKF_STATUS_OK: 1101 case HKF_STATUS_MATCHED: 1102 /* 1103 * Don't hash hosts already already hashed, with wildcard 1104 * characters or a CA/revocation marker. 1105 */ 1106 if (was_hashed || has_wild || l->marker != MRK_NONE) { 1107 fprintf(ctx->out, "%s\n", l->line); 1108 if (has_wild && !find_host) { 1109 logit("%s:%lu: ignoring host name " 1110 "with wildcard: %.64s", l->path, 1111 l->linenum, l->hosts); 1112 } 1113 return 0; 1114 } 1115 /* 1116 * Split any comma-separated hostnames from the host list, 1117 * hash and store separately. 1118 */ 1119 ohosts = hosts = xstrdup(l->hosts); 1120 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') { 1121 lowercase(cp); 1122 if ((hashed = host_hash(cp, NULL, 0)) == NULL) 1123 fatal("hash_host failed"); 1124 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey); 1125 ctx->has_unhashed = 1; 1126 } 1127 free(ohosts); 1128 return 0; 1129 case HKF_STATUS_INVALID: 1130 /* Retain invalid lines, but mark file as invalid. */ 1131 ctx->invalid = 1; 1132 logit("%s:%lu: invalid line", l->path, l->linenum); 1133 /* FALLTHROUGH */ 1134 default: 1135 fprintf(ctx->out, "%s\n", l->line); 1136 return 0; 1137 } 1138 /* NOTREACHED */ 1139 return -1; 1140 } 1141 1142 static int 1143 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx) 1144 { 1145 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1146 enum sshkey_fp_rep rep; 1147 int fptype; 1148 char *fp; 1149 1150 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 1151 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 1152 1153 if (l->status == HKF_STATUS_MATCHED) { 1154 if (delete_host) { 1155 if (l->marker != MRK_NONE) { 1156 /* Don't remove CA and revocation lines */ 1157 fprintf(ctx->out, "%s\n", l->line); 1158 } else { 1159 /* 1160 * Hostname matches and has no CA/revoke 1161 * marker, delete it by *not* writing the 1162 * line to ctx->out. 1163 */ 1164 ctx->found_key = 1; 1165 if (!quiet) 1166 printf("# Host %s found: line %lu\n", 1167 ctx->host, l->linenum); 1168 } 1169 return 0; 1170 } else if (find_host) { 1171 ctx->found_key = 1; 1172 if (!quiet) { 1173 printf("# Host %s found: line %lu %s\n", 1174 ctx->host, 1175 l->linenum, l->marker == MRK_CA ? "CA" : 1176 (l->marker == MRK_REVOKE ? "REVOKED" : "")); 1177 } 1178 if (hash_hosts) 1179 known_hosts_hash(l, ctx); 1180 else if (print_fingerprint) { 1181 fp = sshkey_fingerprint(l->key, fptype, rep); 1182 mprintf("%s %s %s %s\n", ctx->host, 1183 sshkey_type(l->key), fp, l->comment); 1184 free(fp); 1185 } else 1186 fprintf(ctx->out, "%s\n", l->line); 1187 return 0; 1188 } 1189 } else if (delete_host) { 1190 /* Retain non-matching hosts when deleting */ 1191 if (l->status == HKF_STATUS_INVALID) { 1192 ctx->invalid = 1; 1193 logit("%s:%lu: invalid line", l->path, l->linenum); 1194 } 1195 fprintf(ctx->out, "%s\n", l->line); 1196 } 1197 return 0; 1198 } 1199 1200 static void 1201 do_known_hosts(struct passwd *pw, const char *name) 1202 { 1203 char *cp, tmp[PATH_MAX], old[PATH_MAX]; 1204 int r, fd, oerrno, inplace = 0; 1205 struct known_hosts_ctx ctx; 1206 u_int foreach_options; 1207 1208 if (!have_identity) { 1209 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1210 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1211 sizeof(identity_file)) 1212 fatal("Specified known hosts path too long"); 1213 free(cp); 1214 have_identity = 1; 1215 } 1216 1217 memset(&ctx, 0, sizeof(ctx)); 1218 ctx.out = stdout; 1219 ctx.host = name; 1220 1221 /* 1222 * Find hosts goes to stdout, hash and deletions happen in-place 1223 * A corner case is ssh-keygen -HF foo, which should go to stdout 1224 */ 1225 if (!find_host && (hash_hosts || delete_host)) { 1226 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1227 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1228 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1229 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1230 fatal("known_hosts path too long"); 1231 umask(077); 1232 if ((fd = mkstemp(tmp)) == -1) 1233 fatal("mkstemp: %s", strerror(errno)); 1234 if ((ctx.out = fdopen(fd, "w")) == NULL) { 1235 oerrno = errno; 1236 unlink(tmp); 1237 fatal("fdopen: %s", strerror(oerrno)); 1238 } 1239 inplace = 1; 1240 } 1241 1242 /* XXX support identity_file == "-" for stdin */ 1243 foreach_options = find_host ? HKF_WANT_MATCH : 0; 1244 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0; 1245 if ((r = hostkeys_foreach(identity_file, 1246 hash_hosts ? known_hosts_hash : known_hosts_find_delete, &ctx, 1247 name, NULL, foreach_options)) != 0) { 1248 if (inplace) 1249 unlink(tmp); 1250 fatal("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r)); 1251 } 1252 1253 if (inplace) 1254 fclose(ctx.out); 1255 1256 if (ctx.invalid) { 1257 error("%s is not a valid known_hosts file.", identity_file); 1258 if (inplace) { 1259 error("Not replacing existing known_hosts " 1260 "file because of errors"); 1261 unlink(tmp); 1262 } 1263 exit(1); 1264 } else if (delete_host && !ctx.found_key) { 1265 logit("Host %s not found in %s", name, identity_file); 1266 if (inplace) 1267 unlink(tmp); 1268 } else if (inplace) { 1269 /* Backup existing file */ 1270 if (unlink(old) == -1 && errno != ENOENT) 1271 fatal("unlink %.100s: %s", old, strerror(errno)); 1272 if (link(identity_file, old) == -1) 1273 fatal("link %.100s to %.100s: %s", identity_file, old, 1274 strerror(errno)); 1275 /* Move new one into place */ 1276 if (rename(tmp, identity_file) == -1) { 1277 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1278 strerror(errno)); 1279 unlink(tmp); 1280 unlink(old); 1281 exit(1); 1282 } 1283 1284 printf("%s updated.\n", identity_file); 1285 printf("Original contents retained as %s\n", old); 1286 if (ctx.has_unhashed) { 1287 logit("WARNING: %s contains unhashed entries", old); 1288 logit("Delete this file to ensure privacy " 1289 "of hostnames"); 1290 } 1291 } 1292 1293 exit (find_host && !ctx.found_key); 1294 } 1295 1296 /* 1297 * Perform changing a passphrase. The argument is the passwd structure 1298 * for the current user. 1299 */ 1300 static void 1301 do_change_passphrase(struct passwd *pw) 1302 { 1303 char *comment; 1304 char *old_passphrase, *passphrase1, *passphrase2; 1305 struct stat st; 1306 struct sshkey *private; 1307 int r; 1308 1309 if (!have_identity) 1310 ask_filename(pw, "Enter file in which the key is"); 1311 if (stat(identity_file, &st) < 0) 1312 fatal("%s: %s", identity_file, strerror(errno)); 1313 /* Try to load the file with empty passphrase. */ 1314 r = sshkey_load_private(identity_file, "", &private, &comment); 1315 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) { 1316 if (identity_passphrase) 1317 old_passphrase = xstrdup(identity_passphrase); 1318 else 1319 old_passphrase = 1320 read_passphrase("Enter old passphrase: ", 1321 RP_ALLOW_STDIN); 1322 r = sshkey_load_private(identity_file, old_passphrase, 1323 &private, &comment); 1324 explicit_bzero(old_passphrase, strlen(old_passphrase)); 1325 free(old_passphrase); 1326 if (r != 0) 1327 goto badkey; 1328 } else if (r != 0) { 1329 badkey: 1330 fatal("Failed to load key %s: %s", identity_file, ssh_err(r)); 1331 } 1332 if (comment) 1333 mprintf("Key has comment '%s'\n", comment); 1334 1335 /* Ask the new passphrase (twice). */ 1336 if (identity_new_passphrase) { 1337 passphrase1 = xstrdup(identity_new_passphrase); 1338 passphrase2 = NULL; 1339 } else { 1340 passphrase1 = 1341 read_passphrase("Enter new passphrase (empty for no " 1342 "passphrase): ", RP_ALLOW_STDIN); 1343 passphrase2 = read_passphrase("Enter same passphrase again: ", 1344 RP_ALLOW_STDIN); 1345 1346 /* Verify that they are the same. */ 1347 if (strcmp(passphrase1, passphrase2) != 0) { 1348 explicit_bzero(passphrase1, strlen(passphrase1)); 1349 explicit_bzero(passphrase2, strlen(passphrase2)); 1350 free(passphrase1); 1351 free(passphrase2); 1352 printf("Pass phrases do not match. Try again.\n"); 1353 exit(1); 1354 } 1355 /* Destroy the other copy. */ 1356 explicit_bzero(passphrase2, strlen(passphrase2)); 1357 free(passphrase2); 1358 } 1359 1360 /* Save the file using the new passphrase. */ 1361 if ((r = sshkey_save_private(private, identity_file, passphrase1, 1362 comment, use_new_format, new_format_cipher, rounds)) != 0) { 1363 error("Saving key \"%s\" failed: %s.", 1364 identity_file, ssh_err(r)); 1365 explicit_bzero(passphrase1, strlen(passphrase1)); 1366 free(passphrase1); 1367 sshkey_free(private); 1368 free(comment); 1369 exit(1); 1370 } 1371 /* Destroy the passphrase and the copy of the key in memory. */ 1372 explicit_bzero(passphrase1, strlen(passphrase1)); 1373 free(passphrase1); 1374 sshkey_free(private); /* Destroys contents */ 1375 free(comment); 1376 1377 printf("Your identification has been saved with the new passphrase.\n"); 1378 exit(0); 1379 } 1380 1381 /* 1382 * Print the SSHFP RR. 1383 */ 1384 static int 1385 do_print_resource_record(struct passwd *pw, char *fname, char *hname) 1386 { 1387 struct sshkey *public; 1388 char *comment = NULL; 1389 struct stat st; 1390 int r; 1391 1392 if (fname == NULL) 1393 fatal("%s: no filename", __func__); 1394 if (stat(fname, &st) < 0) { 1395 if (errno == ENOENT) 1396 return 0; 1397 fatal("%s: %s", fname, strerror(errno)); 1398 } 1399 if ((r = sshkey_load_public(fname, &public, &comment)) != 0) 1400 fatal("Failed to read v2 public key from \"%s\": %s.", 1401 fname, ssh_err(r)); 1402 export_dns_rr(hname, public, stdout, print_generic); 1403 sshkey_free(public); 1404 free(comment); 1405 return 1; 1406 } 1407 1408 /* 1409 * Change the comment of a private key file. 1410 */ 1411 static void 1412 do_change_comment(struct passwd *pw) 1413 { 1414 char new_comment[1024], *comment, *passphrase; 1415 struct sshkey *private; 1416 struct sshkey *public; 1417 struct stat st; 1418 FILE *f; 1419 int r, fd; 1420 1421 if (!have_identity) 1422 ask_filename(pw, "Enter file in which the key is"); 1423 if (stat(identity_file, &st) < 0) 1424 fatal("%s: %s", identity_file, strerror(errno)); 1425 if ((r = sshkey_load_private(identity_file, "", 1426 &private, &comment)) == 0) 1427 passphrase = xstrdup(""); 1428 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 1429 fatal("Cannot load private key \"%s\": %s.", 1430 identity_file, ssh_err(r)); 1431 else { 1432 if (identity_passphrase) 1433 passphrase = xstrdup(identity_passphrase); 1434 else if (identity_new_passphrase) 1435 passphrase = xstrdup(identity_new_passphrase); 1436 else 1437 passphrase = read_passphrase("Enter passphrase: ", 1438 RP_ALLOW_STDIN); 1439 /* Try to load using the passphrase. */ 1440 if ((r = sshkey_load_private(identity_file, passphrase, 1441 &private, &comment)) != 0) { 1442 explicit_bzero(passphrase, strlen(passphrase)); 1443 free(passphrase); 1444 fatal("Cannot load private key \"%s\": %s.", 1445 identity_file, ssh_err(r)); 1446 } 1447 } 1448 1449 if (private->type != KEY_ED25519 && private->type != KEY_XMSS && 1450 !use_new_format) { 1451 error("Comments are only supported for keys stored in " 1452 "the new format (-o)."); 1453 explicit_bzero(passphrase, strlen(passphrase)); 1454 sshkey_free(private); 1455 exit(1); 1456 } 1457 if (comment) 1458 printf("Key now has comment '%s'\n", comment); 1459 else 1460 printf("Key now has no comment\n"); 1461 1462 if (identity_comment) { 1463 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1464 } else { 1465 printf("Enter new comment: "); 1466 fflush(stdout); 1467 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1468 explicit_bzero(passphrase, strlen(passphrase)); 1469 sshkey_free(private); 1470 exit(1); 1471 } 1472 new_comment[strcspn(new_comment, "\n")] = '\0'; 1473 } 1474 1475 /* Save the file using the new passphrase. */ 1476 if ((r = sshkey_save_private(private, identity_file, passphrase, 1477 new_comment, use_new_format, new_format_cipher, rounds)) != 0) { 1478 error("Saving key \"%s\" failed: %s", 1479 identity_file, ssh_err(r)); 1480 explicit_bzero(passphrase, strlen(passphrase)); 1481 free(passphrase); 1482 sshkey_free(private); 1483 free(comment); 1484 exit(1); 1485 } 1486 explicit_bzero(passphrase, strlen(passphrase)); 1487 free(passphrase); 1488 if ((r = sshkey_from_private(private, &public)) != 0) 1489 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1490 sshkey_free(private); 1491 1492 strlcat(identity_file, ".pub", sizeof(identity_file)); 1493 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1494 if (fd == -1) 1495 fatal("Could not save your public key in %s", identity_file); 1496 f = fdopen(fd, "w"); 1497 if (f == NULL) 1498 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 1499 if ((r = sshkey_write(public, f)) != 0) 1500 fatal("write key failed: %s", ssh_err(r)); 1501 sshkey_free(public); 1502 fprintf(f, " %s\n", new_comment); 1503 fclose(f); 1504 1505 free(comment); 1506 1507 printf("The comment in your key file has been changed.\n"); 1508 exit(0); 1509 } 1510 1511 static void 1512 add_flag_option(struct sshbuf *c, const char *name) 1513 { 1514 int r; 1515 1516 debug3("%s: %s", __func__, name); 1517 if ((r = sshbuf_put_cstring(c, name)) != 0 || 1518 (r = sshbuf_put_string(c, NULL, 0)) != 0) 1519 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1520 } 1521 1522 static void 1523 add_string_option(struct sshbuf *c, const char *name, const char *value) 1524 { 1525 struct sshbuf *b; 1526 int r; 1527 1528 debug3("%s: %s=%s", __func__, name, value); 1529 if ((b = sshbuf_new()) == NULL) 1530 fatal("%s: sshbuf_new failed", __func__); 1531 if ((r = sshbuf_put_cstring(b, value)) != 0 || 1532 (r = sshbuf_put_cstring(c, name)) != 0 || 1533 (r = sshbuf_put_stringb(c, b)) != 0) 1534 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1535 1536 sshbuf_free(b); 1537 } 1538 1539 #define OPTIONS_CRITICAL 1 1540 #define OPTIONS_EXTENSIONS 2 1541 static void 1542 prepare_options_buf(struct sshbuf *c, int which) 1543 { 1544 size_t i; 1545 1546 sshbuf_reset(c); 1547 if ((which & OPTIONS_CRITICAL) != 0 && 1548 certflags_command != NULL) 1549 add_string_option(c, "force-command", certflags_command); 1550 if ((which & OPTIONS_EXTENSIONS) != 0 && 1551 (certflags_flags & CERTOPT_X_FWD) != 0) 1552 add_flag_option(c, "permit-X11-forwarding"); 1553 if ((which & OPTIONS_EXTENSIONS) != 0 && 1554 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1555 add_flag_option(c, "permit-agent-forwarding"); 1556 if ((which & OPTIONS_EXTENSIONS) != 0 && 1557 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1558 add_flag_option(c, "permit-port-forwarding"); 1559 if ((which & OPTIONS_EXTENSIONS) != 0 && 1560 (certflags_flags & CERTOPT_PTY) != 0) 1561 add_flag_option(c, "permit-pty"); 1562 if ((which & OPTIONS_EXTENSIONS) != 0 && 1563 (certflags_flags & CERTOPT_USER_RC) != 0) 1564 add_flag_option(c, "permit-user-rc"); 1565 if ((which & OPTIONS_CRITICAL) != 0 && 1566 certflags_src_addr != NULL) 1567 add_string_option(c, "source-address", certflags_src_addr); 1568 for (i = 0; i < ncert_userext; i++) { 1569 if ((cert_userext[i].crit && (which & OPTIONS_EXTENSIONS)) || 1570 (!cert_userext[i].crit && (which & OPTIONS_CRITICAL))) 1571 continue; 1572 if (cert_userext[i].val == NULL) 1573 add_flag_option(c, cert_userext[i].key); 1574 else { 1575 add_string_option(c, cert_userext[i].key, 1576 cert_userext[i].val); 1577 } 1578 } 1579 } 1580 1581 static struct sshkey * 1582 load_pkcs11_key(char *path) 1583 { 1584 #ifdef ENABLE_PKCS11 1585 struct sshkey **keys = NULL, *public, *private = NULL; 1586 int r, i, nkeys; 1587 1588 if ((r = sshkey_load_public(path, &public, NULL)) != 0) 1589 fatal("Couldn't load CA public key \"%s\": %s", 1590 path, ssh_err(r)); 1591 1592 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1593 debug3("%s: %d keys", __func__, nkeys); 1594 if (nkeys <= 0) 1595 fatal("cannot read public key from pkcs11"); 1596 for (i = 0; i < nkeys; i++) { 1597 if (sshkey_equal_public(public, keys[i])) { 1598 private = keys[i]; 1599 continue; 1600 } 1601 sshkey_free(keys[i]); 1602 } 1603 free(keys); 1604 sshkey_free(public); 1605 return private; 1606 #else 1607 fatal("no pkcs11 support"); 1608 #endif /* ENABLE_PKCS11 */ 1609 } 1610 1611 /* Signer for sshkey_certify_custom that uses the agent */ 1612 static int 1613 agent_signer(const struct sshkey *key, u_char **sigp, size_t *lenp, 1614 const u_char *data, size_t datalen, 1615 const char *alg, u_int compat, void *ctx) 1616 { 1617 int *agent_fdp = (int *)ctx; 1618 1619 return ssh_agent_sign(*agent_fdp, key, sigp, lenp, 1620 data, datalen, alg, compat); 1621 } 1622 1623 static void 1624 do_ca_sign(struct passwd *pw, int argc, char **argv) 1625 { 1626 int r, i, fd, found, agent_fd = -1; 1627 u_int n; 1628 struct sshkey *ca, *public; 1629 char valid[64], *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1630 FILE *f; 1631 struct ssh_identitylist *agent_ids; 1632 size_t j; 1633 1634 #ifdef ENABLE_PKCS11 1635 pkcs11_init(1); 1636 #endif 1637 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1638 if (pkcs11provider != NULL) { 1639 /* If a PKCS#11 token was specified then try to use it */ 1640 if ((ca = load_pkcs11_key(tmp)) == NULL) 1641 fatal("No PKCS#11 key matching %s found", ca_key_path); 1642 } else if (prefer_agent) { 1643 /* 1644 * Agent signature requested. Try to use agent after making 1645 * sure the public key specified is actually present in the 1646 * agent. 1647 */ 1648 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 1649 fatal("Cannot load CA public key %s: %s", 1650 tmp, ssh_err(r)); 1651 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 1652 fatal("Cannot use public key for CA signature: %s", 1653 ssh_err(r)); 1654 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0) 1655 fatal("Retrieve agent key list: %s", ssh_err(r)); 1656 found = 0; 1657 for (j = 0; j < agent_ids->nkeys; j++) { 1658 if (sshkey_equal(ca, agent_ids->keys[j])) { 1659 found = 1; 1660 break; 1661 } 1662 } 1663 if (!found) 1664 fatal("CA key %s not found in agent", tmp); 1665 ssh_free_identitylist(agent_ids); 1666 ca->flags |= SSHKEY_FLAG_EXT; 1667 } else { 1668 /* CA key is assumed to be a private key on the filesystem */ 1669 ca = load_identity(tmp); 1670 } 1671 free(tmp); 1672 1673 if (key_type_name != NULL && 1674 sshkey_type_from_name(key_type_name) != ca->type) { 1675 fatal("CA key type %s doesn't match specified %s", 1676 sshkey_ssh_name(ca), key_type_name); 1677 } 1678 1679 for (i = 0; i < argc; i++) { 1680 /* Split list of principals */ 1681 n = 0; 1682 if (cert_principals != NULL) { 1683 otmp = tmp = xstrdup(cert_principals); 1684 plist = NULL; 1685 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1686 plist = xreallocarray(plist, n + 1, sizeof(*plist)); 1687 if (*(plist[n] = xstrdup(cp)) == '\0') 1688 fatal("Empty principal name"); 1689 } 1690 free(otmp); 1691 } 1692 if (n > SSHKEY_CERT_MAX_PRINCIPALS) 1693 fatal("Too many certificate principals specified"); 1694 1695 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1696 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0) 1697 fatal("%s: unable to open \"%s\": %s", 1698 __func__, tmp, ssh_err(r)); 1699 if (public->type != KEY_RSA && public->type != KEY_DSA && 1700 public->type != KEY_ECDSA && public->type != KEY_ED25519 && 1701 public->type != KEY_XMSS) 1702 fatal("%s: key \"%s\" type %s cannot be certified", 1703 __func__, tmp, sshkey_type(public)); 1704 1705 /* Prepare certificate to sign */ 1706 if ((r = sshkey_to_certified(public)) != 0) 1707 fatal("Could not upgrade key %s to certificate: %s", 1708 tmp, ssh_err(r)); 1709 public->cert->type = cert_key_type; 1710 public->cert->serial = (u_int64_t)cert_serial; 1711 public->cert->key_id = xstrdup(cert_key_id); 1712 public->cert->nprincipals = n; 1713 public->cert->principals = plist; 1714 public->cert->valid_after = cert_valid_from; 1715 public->cert->valid_before = cert_valid_to; 1716 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL); 1717 prepare_options_buf(public->cert->extensions, 1718 OPTIONS_EXTENSIONS); 1719 if ((r = sshkey_from_private(ca, 1720 &public->cert->signature_key)) != 0) 1721 fatal("sshkey_from_private (ca key): %s", ssh_err(r)); 1722 1723 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) { 1724 if ((r = sshkey_certify_custom(public, ca, 1725 key_type_name, agent_signer, &agent_fd)) != 0) 1726 fatal("Couldn't certify key %s via agent: %s", 1727 tmp, ssh_err(r)); 1728 } else { 1729 if ((sshkey_certify(public, ca, key_type_name)) != 0) 1730 fatal("Couldn't certify key %s: %s", 1731 tmp, ssh_err(r)); 1732 } 1733 1734 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1735 *cp = '\0'; 1736 xasprintf(&out, "%s-cert.pub", tmp); 1737 free(tmp); 1738 1739 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1740 fatal("Could not open \"%s\" for writing: %s", out, 1741 strerror(errno)); 1742 if ((f = fdopen(fd, "w")) == NULL) 1743 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1744 if ((r = sshkey_write(public, f)) != 0) 1745 fatal("Could not write certified key to %s: %s", 1746 out, ssh_err(r)); 1747 fprintf(f, " %s\n", comment); 1748 fclose(f); 1749 1750 if (!quiet) { 1751 sshkey_format_cert_validity(public->cert, 1752 valid, sizeof(valid)); 1753 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1754 "valid %s", sshkey_cert_type(public), 1755 out, public->cert->key_id, 1756 (unsigned long long)public->cert->serial, 1757 cert_principals != NULL ? " for " : "", 1758 cert_principals != NULL ? cert_principals : "", 1759 valid); 1760 } 1761 1762 sshkey_free(public); 1763 free(out); 1764 } 1765 #ifdef ENABLE_PKCS11 1766 pkcs11_terminate(); 1767 #endif 1768 exit(0); 1769 } 1770 1771 static u_int64_t 1772 parse_relative_time(const char *s, time_t now) 1773 { 1774 int64_t mul, secs; 1775 1776 mul = *s == '-' ? -1 : 1; 1777 1778 if ((secs = convtime(s + 1)) == -1) 1779 fatal("Invalid relative certificate time %s", s); 1780 if (mul == -1 && secs > now) 1781 fatal("Certificate time %s cannot be represented", s); 1782 return now + (u_int64_t)(secs * mul); 1783 } 1784 1785 static u_int64_t 1786 parse_absolute_time(const char *s) 1787 { 1788 struct tm tm; 1789 time_t tt; 1790 char buf[32], *fmt; 1791 1792 /* 1793 * POSIX strptime says "The application shall ensure that there 1794 * is white-space or other non-alphanumeric characters between 1795 * any two conversion specifications" so arrange things this way. 1796 */ 1797 switch (strlen(s)) { 1798 case 8: 1799 fmt = "%Y-%m-%d"; 1800 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 1801 break; 1802 case 14: 1803 fmt = "%Y-%m-%dT%H:%M:%S"; 1804 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 1805 s, s + 4, s + 6, s + 8, s + 10, s + 12); 1806 break; 1807 default: 1808 fatal("Invalid certificate time format \"%s\"", s); 1809 } 1810 1811 memset(&tm, 0, sizeof(tm)); 1812 if (strptime(buf, fmt, &tm) == NULL) 1813 fatal("Invalid certificate time %s", s); 1814 if ((tt = mktime(&tm)) < 0) 1815 fatal("Certificate time %s cannot be represented", s); 1816 return (u_int64_t)tt; 1817 } 1818 1819 static void 1820 parse_cert_times(char *timespec) 1821 { 1822 char *from, *to; 1823 time_t now = time(NULL); 1824 int64_t secs; 1825 1826 /* +timespec relative to now */ 1827 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1828 if ((secs = convtime(timespec + 1)) == -1) 1829 fatal("Invalid relative certificate life %s", timespec); 1830 cert_valid_to = now + secs; 1831 /* 1832 * Backdate certificate one minute to avoid problems on hosts 1833 * with poorly-synchronised clocks. 1834 */ 1835 cert_valid_from = ((now - 59)/ 60) * 60; 1836 return; 1837 } 1838 1839 /* 1840 * from:to, where 1841 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "always" 1842 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "forever" 1843 */ 1844 from = xstrdup(timespec); 1845 to = strchr(from, ':'); 1846 if (to == NULL || from == to || *(to + 1) == '\0') 1847 fatal("Invalid certificate life specification %s", timespec); 1848 *to++ = '\0'; 1849 1850 if (*from == '-' || *from == '+') 1851 cert_valid_from = parse_relative_time(from, now); 1852 else if (strcmp(from, "always") == 0) 1853 cert_valid_from = 0; 1854 else 1855 cert_valid_from = parse_absolute_time(from); 1856 1857 if (*to == '-' || *to == '+') 1858 cert_valid_to = parse_relative_time(to, now); 1859 else if (strcmp(to, "forever") == 0) 1860 cert_valid_to = ~(u_int64_t)0; 1861 else 1862 cert_valid_to = parse_absolute_time(to); 1863 1864 if (cert_valid_to <= cert_valid_from) 1865 fatal("Empty certificate validity interval"); 1866 free(from); 1867 } 1868 1869 static void 1870 add_cert_option(char *opt) 1871 { 1872 char *val, *cp; 1873 int iscrit = 0; 1874 1875 if (strcasecmp(opt, "clear") == 0) 1876 certflags_flags = 0; 1877 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1878 certflags_flags &= ~CERTOPT_X_FWD; 1879 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1880 certflags_flags |= CERTOPT_X_FWD; 1881 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1882 certflags_flags &= ~CERTOPT_AGENT_FWD; 1883 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1884 certflags_flags |= CERTOPT_AGENT_FWD; 1885 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1886 certflags_flags &= ~CERTOPT_PORT_FWD; 1887 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1888 certflags_flags |= CERTOPT_PORT_FWD; 1889 else if (strcasecmp(opt, "no-pty") == 0) 1890 certflags_flags &= ~CERTOPT_PTY; 1891 else if (strcasecmp(opt, "permit-pty") == 0) 1892 certflags_flags |= CERTOPT_PTY; 1893 else if (strcasecmp(opt, "no-user-rc") == 0) 1894 certflags_flags &= ~CERTOPT_USER_RC; 1895 else if (strcasecmp(opt, "permit-user-rc") == 0) 1896 certflags_flags |= CERTOPT_USER_RC; 1897 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1898 val = opt + 14; 1899 if (*val == '\0') 1900 fatal("Empty force-command option"); 1901 if (certflags_command != NULL) 1902 fatal("force-command already specified"); 1903 certflags_command = xstrdup(val); 1904 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1905 val = opt + 15; 1906 if (*val == '\0') 1907 fatal("Empty source-address option"); 1908 if (certflags_src_addr != NULL) 1909 fatal("source-address already specified"); 1910 if (addr_match_cidr_list(NULL, val) != 0) 1911 fatal("Invalid source-address list"); 1912 certflags_src_addr = xstrdup(val); 1913 } else if (strncasecmp(opt, "extension:", 10) == 0 || 1914 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) { 1915 val = xstrdup(strchr(opt, ':') + 1); 1916 if ((cp = strchr(val, '=')) != NULL) 1917 *cp++ = '\0'; 1918 cert_userext = xreallocarray(cert_userext, ncert_userext + 1, 1919 sizeof(*cert_userext)); 1920 cert_userext[ncert_userext].key = val; 1921 cert_userext[ncert_userext].val = cp == NULL ? 1922 NULL : xstrdup(cp); 1923 cert_userext[ncert_userext].crit = iscrit; 1924 ncert_userext++; 1925 } else 1926 fatal("Unsupported certificate option \"%s\"", opt); 1927 } 1928 1929 static void 1930 show_options(struct sshbuf *optbuf, int in_critical) 1931 { 1932 char *name, *arg; 1933 struct sshbuf *options, *option = NULL; 1934 int r; 1935 1936 if ((options = sshbuf_fromb(optbuf)) == NULL) 1937 fatal("%s: sshbuf_fromb failed", __func__); 1938 while (sshbuf_len(options) != 0) { 1939 sshbuf_free(option); 1940 option = NULL; 1941 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 || 1942 (r = sshbuf_froms(options, &option)) != 0) 1943 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1944 printf(" %s", name); 1945 if (!in_critical && 1946 (strcmp(name, "permit-X11-forwarding") == 0 || 1947 strcmp(name, "permit-agent-forwarding") == 0 || 1948 strcmp(name, "permit-port-forwarding") == 0 || 1949 strcmp(name, "permit-pty") == 0 || 1950 strcmp(name, "permit-user-rc") == 0)) 1951 printf("\n"); 1952 else if (in_critical && 1953 (strcmp(name, "force-command") == 0 || 1954 strcmp(name, "source-address") == 0)) { 1955 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0) 1956 fatal("%s: buffer error: %s", 1957 __func__, ssh_err(r)); 1958 printf(" %s\n", arg); 1959 free(arg); 1960 } else { 1961 printf(" UNKNOWN OPTION (len %zu)\n", 1962 sshbuf_len(option)); 1963 sshbuf_reset(option); 1964 } 1965 free(name); 1966 if (sshbuf_len(option) != 0) 1967 fatal("Option corrupt: extra data at end"); 1968 } 1969 sshbuf_free(option); 1970 sshbuf_free(options); 1971 } 1972 1973 static void 1974 print_cert(struct sshkey *key) 1975 { 1976 char valid[64], *key_fp, *ca_fp; 1977 u_int i; 1978 1979 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT); 1980 ca_fp = sshkey_fingerprint(key->cert->signature_key, 1981 fingerprint_hash, SSH_FP_DEFAULT); 1982 if (key_fp == NULL || ca_fp == NULL) 1983 fatal("%s: sshkey_fingerprint fail", __func__); 1984 sshkey_format_cert_validity(key->cert, valid, sizeof(valid)); 1985 1986 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key), 1987 sshkey_cert_type(key)); 1988 printf(" Public key: %s %s\n", sshkey_type(key), key_fp); 1989 printf(" Signing CA: %s %s\n", 1990 sshkey_type(key->cert->signature_key), ca_fp); 1991 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1992 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial); 1993 printf(" Valid: %s\n", valid); 1994 printf(" Principals: "); 1995 if (key->cert->nprincipals == 0) 1996 printf("(none)\n"); 1997 else { 1998 for (i = 0; i < key->cert->nprincipals; i++) 1999 printf("\n %s", 2000 key->cert->principals[i]); 2001 printf("\n"); 2002 } 2003 printf(" Critical Options: "); 2004 if (sshbuf_len(key->cert->critical) == 0) 2005 printf("(none)\n"); 2006 else { 2007 printf("\n"); 2008 show_options(key->cert->critical, 1); 2009 } 2010 printf(" Extensions: "); 2011 if (sshbuf_len(key->cert->extensions) == 0) 2012 printf("(none)\n"); 2013 else { 2014 printf("\n"); 2015 show_options(key->cert->extensions, 0); 2016 } 2017 } 2018 2019 static void 2020 do_show_cert(struct passwd *pw) 2021 { 2022 struct sshkey *key = NULL; 2023 struct stat st; 2024 int r, is_stdin = 0, ok = 0; 2025 FILE *f; 2026 char *cp, line[SSH_MAX_PUBKEY_BYTES]; 2027 const char *path; 2028 u_long lnum = 0; 2029 2030 if (!have_identity) 2031 ask_filename(pw, "Enter file in which the key is"); 2032 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) < 0) 2033 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 2034 2035 path = identity_file; 2036 if (strcmp(path, "-") == 0) { 2037 f = stdin; 2038 path = "(stdin)"; 2039 is_stdin = 1; 2040 } else if ((f = fopen(identity_file, "r")) == NULL) 2041 fatal("fopen %s: %s", identity_file, strerror(errno)); 2042 2043 while (read_keyfile_line(f, path, line, sizeof(line), &lnum) == 0) { 2044 sshkey_free(key); 2045 key = NULL; 2046 /* Trim leading space and comments */ 2047 cp = line + strspn(line, " \t"); 2048 if (*cp == '#' || *cp == '\0') 2049 continue; 2050 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2051 fatal("sshkey_new"); 2052 if ((r = sshkey_read(key, &cp)) != 0) { 2053 error("%s:%lu: invalid key: %s", path, 2054 lnum, ssh_err(r)); 2055 continue; 2056 } 2057 if (!sshkey_is_cert(key)) { 2058 error("%s:%lu is not a certificate", path, lnum); 2059 continue; 2060 } 2061 ok = 1; 2062 if (!is_stdin && lnum == 1) 2063 printf("%s:\n", path); 2064 else 2065 printf("%s:%lu:\n", path, lnum); 2066 print_cert(key); 2067 } 2068 sshkey_free(key); 2069 fclose(f); 2070 exit(ok ? 0 : 1); 2071 } 2072 2073 #ifdef WITH_OPENSSL 2074 static void 2075 load_krl(const char *path, struct ssh_krl **krlp) 2076 { 2077 struct sshbuf *krlbuf; 2078 int r, fd; 2079 2080 if ((krlbuf = sshbuf_new()) == NULL) 2081 fatal("sshbuf_new failed"); 2082 if ((fd = open(path, O_RDONLY)) == -1) 2083 fatal("open %s: %s", path, strerror(errno)); 2084 if ((r = sshkey_load_file(fd, krlbuf)) != 0) 2085 fatal("Unable to load KRL: %s", ssh_err(r)); 2086 close(fd); 2087 /* XXX check sigs */ 2088 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 || 2089 *krlp == NULL) 2090 fatal("Invalid KRL file: %s", ssh_err(r)); 2091 sshbuf_free(krlbuf); 2092 } 2093 2094 static void 2095 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca, 2096 const struct sshkey *ca, struct ssh_krl *krl) 2097 { 2098 struct sshkey *key = NULL; 2099 u_long lnum = 0; 2100 char *path, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES]; 2101 unsigned long long serial, serial2; 2102 int i, was_explicit_key, was_sha1, r; 2103 FILE *krl_spec; 2104 2105 path = tilde_expand_filename(file, pw->pw_uid); 2106 if (strcmp(path, "-") == 0) { 2107 krl_spec = stdin; 2108 free(path); 2109 path = xstrdup("(standard input)"); 2110 } else if ((krl_spec = fopen(path, "r")) == NULL) 2111 fatal("fopen %s: %s", path, strerror(errno)); 2112 2113 if (!quiet) 2114 printf("Revoking from %s\n", path); 2115 while (read_keyfile_line(krl_spec, path, line, sizeof(line), 2116 &lnum) == 0) { 2117 was_explicit_key = was_sha1 = 0; 2118 cp = line + strspn(line, " \t"); 2119 /* Trim trailing space, comments and strip \n */ 2120 for (i = 0, r = -1; cp[i] != '\0'; i++) { 2121 if (cp[i] == '#' || cp[i] == '\n') { 2122 cp[i] = '\0'; 2123 break; 2124 } 2125 if (cp[i] == ' ' || cp[i] == '\t') { 2126 /* Remember the start of a span of whitespace */ 2127 if (r == -1) 2128 r = i; 2129 } else 2130 r = -1; 2131 } 2132 if (r != -1) 2133 cp[r] = '\0'; 2134 if (*cp == '\0') 2135 continue; 2136 if (strncasecmp(cp, "serial:", 7) == 0) { 2137 if (ca == NULL && !wild_ca) { 2138 fatal("revoking certificates by serial number " 2139 "requires specification of a CA key"); 2140 } 2141 cp += 7; 2142 cp = cp + strspn(cp, " \t"); 2143 errno = 0; 2144 serial = strtoull(cp, &ep, 0); 2145 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 2146 fatal("%s:%lu: invalid serial \"%s\"", 2147 path, lnum, cp); 2148 if (errno == ERANGE && serial == ULLONG_MAX) 2149 fatal("%s:%lu: serial out of range", 2150 path, lnum); 2151 serial2 = serial; 2152 if (*ep == '-') { 2153 cp = ep + 1; 2154 errno = 0; 2155 serial2 = strtoull(cp, &ep, 0); 2156 if (*cp == '\0' || *ep != '\0') 2157 fatal("%s:%lu: invalid serial \"%s\"", 2158 path, lnum, cp); 2159 if (errno == ERANGE && serial2 == ULLONG_MAX) 2160 fatal("%s:%lu: serial out of range", 2161 path, lnum); 2162 if (serial2 <= serial) 2163 fatal("%s:%lu: invalid serial range " 2164 "%llu:%llu", path, lnum, 2165 (unsigned long long)serial, 2166 (unsigned long long)serial2); 2167 } 2168 if (ssh_krl_revoke_cert_by_serial_range(krl, 2169 ca, serial, serial2) != 0) { 2170 fatal("%s: revoke serial failed", 2171 __func__); 2172 } 2173 } else if (strncasecmp(cp, "id:", 3) == 0) { 2174 if (ca == NULL && !wild_ca) { 2175 fatal("revoking certificates by key ID " 2176 "requires specification of a CA key"); 2177 } 2178 cp += 3; 2179 cp = cp + strspn(cp, " \t"); 2180 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2181 fatal("%s: revoke key ID failed", __func__); 2182 } else { 2183 if (strncasecmp(cp, "key:", 4) == 0) { 2184 cp += 4; 2185 cp = cp + strspn(cp, " \t"); 2186 was_explicit_key = 1; 2187 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2188 cp += 5; 2189 cp = cp + strspn(cp, " \t"); 2190 was_sha1 = 1; 2191 } else { 2192 /* 2193 * Just try to process the line as a key. 2194 * Parsing will fail if it isn't. 2195 */ 2196 } 2197 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2198 fatal("sshkey_new"); 2199 if ((r = sshkey_read(key, &cp)) != 0) 2200 fatal("%s:%lu: invalid key: %s", 2201 path, lnum, ssh_err(r)); 2202 if (was_explicit_key) 2203 r = ssh_krl_revoke_key_explicit(krl, key); 2204 else if (was_sha1) 2205 r = ssh_krl_revoke_key_sha1(krl, key); 2206 else 2207 r = ssh_krl_revoke_key(krl, key); 2208 if (r != 0) 2209 fatal("%s: revoke key failed: %s", 2210 __func__, ssh_err(r)); 2211 sshkey_free(key); 2212 } 2213 } 2214 if (strcmp(path, "-") != 0) 2215 fclose(krl_spec); 2216 free(path); 2217 } 2218 2219 static void 2220 do_gen_krl(struct passwd *pw, int updating, int argc, char **argv) 2221 { 2222 struct ssh_krl *krl; 2223 struct stat sb; 2224 struct sshkey *ca = NULL; 2225 int fd, i, r, wild_ca = 0; 2226 char *tmp; 2227 struct sshbuf *kbuf; 2228 2229 if (*identity_file == '\0') 2230 fatal("KRL generation requires an output file"); 2231 if (stat(identity_file, &sb) == -1) { 2232 if (errno != ENOENT) 2233 fatal("Cannot access KRL \"%s\": %s", 2234 identity_file, strerror(errno)); 2235 if (updating) 2236 fatal("KRL \"%s\" does not exist", identity_file); 2237 } 2238 if (ca_key_path != NULL) { 2239 if (strcasecmp(ca_key_path, "none") == 0) 2240 wild_ca = 1; 2241 else { 2242 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2243 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 2244 fatal("Cannot load CA public key %s: %s", 2245 tmp, ssh_err(r)); 2246 free(tmp); 2247 } 2248 } 2249 2250 if (updating) 2251 load_krl(identity_file, &krl); 2252 else if ((krl = ssh_krl_init()) == NULL) 2253 fatal("couldn't create KRL"); 2254 2255 if (cert_serial != 0) 2256 ssh_krl_set_version(krl, cert_serial); 2257 if (identity_comment != NULL) 2258 ssh_krl_set_comment(krl, identity_comment); 2259 2260 for (i = 0; i < argc; i++) 2261 update_krl_from_file(pw, argv[i], wild_ca, ca, krl); 2262 2263 if ((kbuf = sshbuf_new()) == NULL) 2264 fatal("sshbuf_new failed"); 2265 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0) 2266 fatal("Couldn't generate KRL"); 2267 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2268 fatal("open %s: %s", identity_file, strerror(errno)); 2269 if (atomicio(vwrite, fd, (void *)sshbuf_ptr(kbuf), sshbuf_len(kbuf)) != 2270 sshbuf_len(kbuf)) 2271 fatal("write %s: %s", identity_file, strerror(errno)); 2272 close(fd); 2273 sshbuf_free(kbuf); 2274 ssh_krl_free(krl); 2275 sshkey_free(ca); 2276 } 2277 2278 static void 2279 do_check_krl(struct passwd *pw, int argc, char **argv) 2280 { 2281 int i, r, ret = 0; 2282 char *comment; 2283 struct ssh_krl *krl; 2284 struct sshkey *k; 2285 2286 if (*identity_file == '\0') 2287 fatal("KRL checking requires an input file"); 2288 load_krl(identity_file, &krl); 2289 for (i = 0; i < argc; i++) { 2290 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0) 2291 fatal("Cannot load public key %s: %s", 2292 argv[i], ssh_err(r)); 2293 r = ssh_krl_check_key(krl, k); 2294 printf("%s%s%s%s: %s\n", argv[i], 2295 *comment ? " (" : "", comment, *comment ? ")" : "", 2296 r == 0 ? "ok" : "REVOKED"); 2297 if (r != 0) 2298 ret = 1; 2299 sshkey_free(k); 2300 free(comment); 2301 } 2302 ssh_krl_free(krl); 2303 exit(ret); 2304 } 2305 #endif 2306 2307 static void 2308 usage(void) 2309 { 2310 fprintf(stderr, 2311 "usage: ssh-keygen [-q] [-b bits] [-t dsa | ecdsa | ed25519 | rsa]\n" 2312 " [-N new_passphrase] [-C comment] [-f output_keyfile]\n" 2313 " ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]\n" 2314 " ssh-keygen -i [-m key_format] [-f input_keyfile]\n" 2315 " ssh-keygen -e [-m key_format] [-f input_keyfile]\n" 2316 " ssh-keygen -y [-f input_keyfile]\n" 2317 " ssh-keygen -c [-P passphrase] [-C comment] [-f keyfile]\n" 2318 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n" 2319 " ssh-keygen -B [-f input_keyfile]\n"); 2320 #ifdef ENABLE_PKCS11 2321 fprintf(stderr, 2322 " ssh-keygen -D pkcs11\n"); 2323 #endif 2324 fprintf(stderr, 2325 " ssh-keygen -F hostname [-f known_hosts_file] [-l]\n" 2326 " ssh-keygen -H [-f known_hosts_file]\n" 2327 " ssh-keygen -R hostname [-f known_hosts_file]\n" 2328 " ssh-keygen -r hostname [-f input_keyfile] [-g]\n" 2329 #ifdef WITH_OPENSSL 2330 " ssh-keygen -G output_file [-v] [-b bits] [-M memory] [-S start_point]\n" 2331 " ssh-keygen -T output_file -f input_file [-v] [-a rounds] [-J num_lines]\n" 2332 " [-j start_line] [-K checkpt] [-W generator]\n" 2333 #endif 2334 " ssh-keygen -s ca_key -I certificate_identity [-h] [-U]\n" 2335 " [-D pkcs11_provider] [-n principals] [-O option]\n" 2336 " [-V validity_interval] [-z serial_number] file ...\n" 2337 " ssh-keygen -L [-f input_keyfile]\n" 2338 " ssh-keygen -A\n" 2339 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n" 2340 " file ...\n" 2341 " ssh-keygen -Q -f krl_file file ...\n"); 2342 exit(1); 2343 } 2344 2345 /* 2346 * Main program for key management. 2347 */ 2348 int 2349 main(int argc, char **argv) 2350 { 2351 char dotsshdir[PATH_MAX], comment[1024], *passphrase1, *passphrase2; 2352 char *rr_hostname = NULL, *ep, *fp, *ra; 2353 struct sshkey *private, *public; 2354 struct passwd *pw; 2355 struct stat st; 2356 int r, opt, type, fd; 2357 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 2358 FILE *f; 2359 const char *errstr; 2360 #ifdef WITH_OPENSSL 2361 /* Moduli generation/screening */ 2362 char out_file[PATH_MAX], *checkpoint = NULL; 2363 u_int32_t memory = 0, generator_wanted = 0; 2364 int do_gen_candidates = 0, do_screen_candidates = 0; 2365 unsigned long start_lineno = 0, lines_to_process = 0; 2366 BIGNUM *start = NULL; 2367 #endif 2368 2369 extern int optind; 2370 extern char *optarg; 2371 2372 ssh_malloc_init(); /* must be called before any mallocs */ 2373 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 2374 sanitise_stdfd(); 2375 2376 OpenSSL_add_all_algorithms(); 2377 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 2378 2379 setlocale(LC_CTYPE, ""); 2380 2381 /* we need this for the home * directory. */ 2382 pw = getpwuid(getuid()); 2383 if (!pw) 2384 fatal("No user exists for uid %lu", (u_long)getuid()); 2385 if (gethostname(hostname, sizeof(hostname)) < 0) 2386 fatal("gethostname: %s", strerror(errno)); 2387 2388 /* Remaining characters: Ydw */ 2389 while ((opt = getopt(argc, argv, "ABHLQUXceghiklopquvxy" 2390 "C:D:E:F:G:I:J:K:M:N:O:P:R:S:T:V:W:Z:" 2391 "a:b:f:g:j:m:n:r:s:t:z:")) != -1) { 2392 switch (opt) { 2393 case 'A': 2394 gen_all_hostkeys = 1; 2395 break; 2396 case 'b': 2397 bits = (u_int32_t)strtonum(optarg, 10, 32768, &errstr); 2398 if (errstr) 2399 fatal("Bits has bad value %s (%s)", 2400 optarg, errstr); 2401 break; 2402 case 'E': 2403 fingerprint_hash = ssh_digest_alg_by_name(optarg); 2404 if (fingerprint_hash == -1) 2405 fatal("Invalid hash algorithm \"%s\"", optarg); 2406 break; 2407 case 'F': 2408 find_host = 1; 2409 rr_hostname = optarg; 2410 break; 2411 case 'H': 2412 hash_hosts = 1; 2413 break; 2414 case 'I': 2415 cert_key_id = optarg; 2416 break; 2417 case 'R': 2418 delete_host = 1; 2419 rr_hostname = optarg; 2420 break; 2421 case 'L': 2422 show_cert = 1; 2423 break; 2424 case 'l': 2425 print_fingerprint = 1; 2426 break; 2427 case 'B': 2428 print_bubblebabble = 1; 2429 break; 2430 case 'm': 2431 if (strcasecmp(optarg, "RFC4716") == 0 || 2432 strcasecmp(optarg, "ssh2") == 0) { 2433 convert_format = FMT_RFC4716; 2434 break; 2435 } 2436 if (strcasecmp(optarg, "PKCS8") == 0) { 2437 convert_format = FMT_PKCS8; 2438 break; 2439 } 2440 if (strcasecmp(optarg, "PEM") == 0) { 2441 convert_format = FMT_PEM; 2442 break; 2443 } 2444 fatal("Unsupported conversion format \"%s\"", optarg); 2445 case 'n': 2446 cert_principals = optarg; 2447 break; 2448 case 'o': 2449 use_new_format = 1; 2450 break; 2451 case 'p': 2452 change_passphrase = 1; 2453 break; 2454 case 'c': 2455 change_comment = 1; 2456 break; 2457 case 'f': 2458 if (strlcpy(identity_file, optarg, 2459 sizeof(identity_file)) >= sizeof(identity_file)) 2460 fatal("Identity filename too long"); 2461 have_identity = 1; 2462 break; 2463 case 'g': 2464 print_generic = 1; 2465 break; 2466 case 'P': 2467 identity_passphrase = optarg; 2468 break; 2469 case 'N': 2470 identity_new_passphrase = optarg; 2471 break; 2472 case 'Q': 2473 check_krl = 1; 2474 break; 2475 case 'O': 2476 add_cert_option(optarg); 2477 break; 2478 case 'Z': 2479 new_format_cipher = optarg; 2480 break; 2481 case 'C': 2482 identity_comment = optarg; 2483 break; 2484 case 'q': 2485 quiet = 1; 2486 break; 2487 case 'e': 2488 case 'x': 2489 /* export key */ 2490 convert_to = 1; 2491 break; 2492 case 'h': 2493 cert_key_type = SSH2_CERT_TYPE_HOST; 2494 certflags_flags = 0; 2495 break; 2496 case 'k': 2497 gen_krl = 1; 2498 break; 2499 case 'i': 2500 case 'X': 2501 /* import key */ 2502 convert_from = 1; 2503 break; 2504 case 'y': 2505 print_public = 1; 2506 break; 2507 case 's': 2508 ca_key_path = optarg; 2509 break; 2510 case 't': 2511 key_type_name = optarg; 2512 break; 2513 case 'D': 2514 pkcs11provider = optarg; 2515 break; 2516 case 'U': 2517 prefer_agent = 1; 2518 break; 2519 case 'u': 2520 update_krl = 1; 2521 break; 2522 case 'v': 2523 if (log_level == SYSLOG_LEVEL_INFO) 2524 log_level = SYSLOG_LEVEL_DEBUG1; 2525 else { 2526 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2527 log_level < SYSLOG_LEVEL_DEBUG3) 2528 log_level++; 2529 } 2530 break; 2531 case 'r': 2532 rr_hostname = optarg; 2533 break; 2534 case 'a': 2535 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr); 2536 if (errstr) 2537 fatal("Invalid number: %s (%s)", 2538 optarg, errstr); 2539 break; 2540 case 'V': 2541 parse_cert_times(optarg); 2542 break; 2543 case 'z': 2544 errno = 0; 2545 cert_serial = strtoull(optarg, &ep, 10); 2546 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 2547 (errno == ERANGE && cert_serial == ULLONG_MAX)) 2548 fatal("Invalid serial number \"%s\"", optarg); 2549 break; 2550 #ifdef WITH_OPENSSL 2551 /* Moduli generation/screening */ 2552 case 'G': 2553 do_gen_candidates = 1; 2554 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2555 sizeof(out_file)) 2556 fatal("Output filename too long"); 2557 break; 2558 case 'J': 2559 lines_to_process = strtoul(optarg, NULL, 10); 2560 break; 2561 case 'j': 2562 start_lineno = strtoul(optarg, NULL, 10); 2563 break; 2564 case 'K': 2565 if (strlen(optarg) >= PATH_MAX) 2566 fatal("Checkpoint filename too long"); 2567 checkpoint = xstrdup(optarg); 2568 break; 2569 case 'M': 2570 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, 2571 &errstr); 2572 if (errstr) 2573 fatal("Memory limit is %s: %s", errstr, optarg); 2574 break; 2575 case 'S': 2576 /* XXX - also compare length against bits */ 2577 if (BN_hex2bn(&start, optarg) == 0) 2578 fatal("Invalid start point."); 2579 break; 2580 case 'T': 2581 do_screen_candidates = 1; 2582 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2583 sizeof(out_file)) 2584 fatal("Output filename too long"); 2585 break; 2586 case 'W': 2587 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2588 UINT_MAX, &errstr); 2589 if (errstr != NULL) 2590 fatal("Desired generator invalid: %s (%s)", 2591 optarg, errstr); 2592 break; 2593 #endif /* WITH_OPENSSL */ 2594 case '?': 2595 default: 2596 usage(); 2597 } 2598 } 2599 2600 /* reinit */ 2601 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2602 2603 argv += optind; 2604 argc -= optind; 2605 2606 if (ca_key_path != NULL) { 2607 if (argc < 1 && !gen_krl) { 2608 error("Too few arguments."); 2609 usage(); 2610 } 2611 } else if (argc > 0 && !gen_krl && !check_krl) { 2612 error("Too many arguments."); 2613 usage(); 2614 } 2615 if (change_passphrase && change_comment) { 2616 error("Can only have one of -p and -c."); 2617 usage(); 2618 } 2619 if (print_fingerprint && (delete_host || hash_hosts)) { 2620 error("Cannot use -l with -H or -R."); 2621 usage(); 2622 } 2623 #ifdef WITH_OPENSSL 2624 if (gen_krl) { 2625 do_gen_krl(pw, update_krl, argc, argv); 2626 return (0); 2627 } 2628 if (check_krl) { 2629 do_check_krl(pw, argc, argv); 2630 return (0); 2631 } 2632 #endif 2633 if (ca_key_path != NULL) { 2634 if (cert_key_id == NULL) 2635 fatal("Must specify key id (-I) when certifying"); 2636 do_ca_sign(pw, argc, argv); 2637 } 2638 if (show_cert) 2639 do_show_cert(pw); 2640 if (delete_host || hash_hosts || find_host) 2641 do_known_hosts(pw, rr_hostname); 2642 if (pkcs11provider != NULL) 2643 do_download(pw); 2644 if (print_fingerprint || print_bubblebabble) 2645 do_fingerprint(pw); 2646 if (change_passphrase) 2647 do_change_passphrase(pw); 2648 if (change_comment) 2649 do_change_comment(pw); 2650 #ifdef WITH_OPENSSL 2651 if (convert_to) 2652 do_convert_to(pw); 2653 if (convert_from) 2654 do_convert_from(pw); 2655 #endif 2656 if (print_public) 2657 do_print_public(pw); 2658 if (rr_hostname != NULL) { 2659 unsigned int n = 0; 2660 2661 if (have_identity) { 2662 n = do_print_resource_record(pw, 2663 identity_file, rr_hostname); 2664 if (n == 0) 2665 fatal("%s: %s", identity_file, strerror(errno)); 2666 exit(0); 2667 } else { 2668 2669 n += do_print_resource_record(pw, 2670 _PATH_HOST_RSA_KEY_FILE, rr_hostname); 2671 n += do_print_resource_record(pw, 2672 _PATH_HOST_DSA_KEY_FILE, rr_hostname); 2673 n += do_print_resource_record(pw, 2674 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname); 2675 n += do_print_resource_record(pw, 2676 _PATH_HOST_ED25519_KEY_FILE, rr_hostname); 2677 n += do_print_resource_record(pw, 2678 _PATH_HOST_XMSS_KEY_FILE, rr_hostname); 2679 if (n == 0) 2680 fatal("no keys found."); 2681 exit(0); 2682 } 2683 } 2684 2685 #ifdef WITH_OPENSSL 2686 if (do_gen_candidates) { 2687 FILE *out = fopen(out_file, "w"); 2688 2689 if (out == NULL) { 2690 error("Couldn't open modulus candidate file \"%s\": %s", 2691 out_file, strerror(errno)); 2692 return (1); 2693 } 2694 if (bits == 0) 2695 bits = DEFAULT_BITS; 2696 if (gen_candidates(out, memory, bits, start) != 0) 2697 fatal("modulus candidate generation failed"); 2698 2699 return (0); 2700 } 2701 2702 if (do_screen_candidates) { 2703 FILE *in; 2704 FILE *out = fopen(out_file, "a"); 2705 2706 if (have_identity && strcmp(identity_file, "-") != 0) { 2707 if ((in = fopen(identity_file, "r")) == NULL) { 2708 fatal("Couldn't open modulus candidate " 2709 "file \"%s\": %s", identity_file, 2710 strerror(errno)); 2711 } 2712 } else 2713 in = stdin; 2714 2715 if (out == NULL) { 2716 fatal("Couldn't open moduli file \"%s\": %s", 2717 out_file, strerror(errno)); 2718 } 2719 if (prime_test(in, out, rounds == 0 ? 100 : rounds, 2720 generator_wanted, checkpoint, 2721 start_lineno, lines_to_process) != 0) 2722 fatal("modulus screening failed"); 2723 return (0); 2724 } 2725 #endif 2726 2727 if (gen_all_hostkeys) { 2728 do_gen_all_hostkeys(pw); 2729 return (0); 2730 } 2731 2732 if (key_type_name == NULL) 2733 key_type_name = DEFAULT_KEY_TYPE_NAME; 2734 2735 type = sshkey_type_from_name(key_type_name); 2736 type_bits_valid(type, key_type_name, &bits); 2737 2738 if (!quiet) 2739 printf("Generating public/private %s key pair.\n", 2740 key_type_name); 2741 if ((r = sshkey_generate(type, bits, &private)) != 0) 2742 fatal("sshkey_generate failed"); 2743 if ((r = sshkey_from_private(private, &public)) != 0) 2744 fatal("sshkey_from_private failed: %s\n", ssh_err(r)); 2745 2746 if (!have_identity) 2747 ask_filename(pw, "Enter file in which to save the key"); 2748 2749 /* Create ~/.ssh directory if it doesn't already exist. */ 2750 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2751 pw->pw_dir, _PATH_SSH_USER_DIR); 2752 if (strstr(identity_file, dotsshdir) != NULL) { 2753 if (stat(dotsshdir, &st) < 0) { 2754 if (errno != ENOENT) { 2755 error("Could not stat %s: %s", dotsshdir, 2756 strerror(errno)); 2757 } else if (mkdir(dotsshdir, 0700) < 0) { 2758 error("Could not create directory '%s': %s", 2759 dotsshdir, strerror(errno)); 2760 } else if (!quiet) 2761 printf("Created directory '%s'.\n", dotsshdir); 2762 } 2763 } 2764 /* If the file already exists, ask the user to confirm. */ 2765 if (stat(identity_file, &st) >= 0) { 2766 char yesno[3]; 2767 printf("%s already exists.\n", identity_file); 2768 printf("Overwrite (y/n)? "); 2769 fflush(stdout); 2770 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2771 exit(1); 2772 if (yesno[0] != 'y' && yesno[0] != 'Y') 2773 exit(1); 2774 } 2775 /* Ask for a passphrase (twice). */ 2776 if (identity_passphrase) 2777 passphrase1 = xstrdup(identity_passphrase); 2778 else if (identity_new_passphrase) 2779 passphrase1 = xstrdup(identity_new_passphrase); 2780 else { 2781 passphrase_again: 2782 passphrase1 = 2783 read_passphrase("Enter passphrase (empty for no " 2784 "passphrase): ", RP_ALLOW_STDIN); 2785 passphrase2 = read_passphrase("Enter same passphrase again: ", 2786 RP_ALLOW_STDIN); 2787 if (strcmp(passphrase1, passphrase2) != 0) { 2788 /* 2789 * The passphrases do not match. Clear them and 2790 * retry. 2791 */ 2792 explicit_bzero(passphrase1, strlen(passphrase1)); 2793 explicit_bzero(passphrase2, strlen(passphrase2)); 2794 free(passphrase1); 2795 free(passphrase2); 2796 printf("Passphrases do not match. Try again.\n"); 2797 goto passphrase_again; 2798 } 2799 /* Clear the other copy of the passphrase. */ 2800 explicit_bzero(passphrase2, strlen(passphrase2)); 2801 free(passphrase2); 2802 } 2803 2804 if (identity_comment) { 2805 strlcpy(comment, identity_comment, sizeof(comment)); 2806 } else { 2807 /* Create default comment field for the passphrase. */ 2808 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2809 } 2810 2811 /* Save the key with the given passphrase and comment. */ 2812 if ((r = sshkey_save_private(private, identity_file, passphrase1, 2813 comment, use_new_format, new_format_cipher, rounds)) != 0) { 2814 error("Saving key \"%s\" failed: %s", 2815 identity_file, ssh_err(r)); 2816 explicit_bzero(passphrase1, strlen(passphrase1)); 2817 free(passphrase1); 2818 exit(1); 2819 } 2820 /* Clear the passphrase. */ 2821 explicit_bzero(passphrase1, strlen(passphrase1)); 2822 free(passphrase1); 2823 2824 /* Clear the private key and the random number generator. */ 2825 sshkey_free(private); 2826 2827 if (!quiet) 2828 printf("Your identification has been saved in %s.\n", identity_file); 2829 2830 strlcat(identity_file, ".pub", sizeof(identity_file)); 2831 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2832 fatal("Unable to save public key to %s: %s", 2833 identity_file, strerror(errno)); 2834 if ((f = fdopen(fd, "w")) == NULL) 2835 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 2836 if ((r = sshkey_write(public, f)) != 0) 2837 error("write key failed: %s", ssh_err(r)); 2838 fprintf(f, " %s\n", comment); 2839 if (ferror(f) || fclose(f) != 0) 2840 fatal("write public failed: %s", strerror(errno)); 2841 2842 if (!quiet) { 2843 fp = sshkey_fingerprint(public, fingerprint_hash, 2844 SSH_FP_DEFAULT); 2845 ra = sshkey_fingerprint(public, fingerprint_hash, 2846 SSH_FP_RANDOMART); 2847 if (fp == NULL || ra == NULL) 2848 fatal("sshkey_fingerprint failed"); 2849 printf("Your public key has been saved in %s.\n", 2850 identity_file); 2851 printf("The key fingerprint is:\n"); 2852 printf("%s %s\n", fp, comment); 2853 printf("The key's randomart image is:\n"); 2854 printf("%s\n", ra); 2855 free(ra); 2856 free(fp); 2857 } 2858 2859 sshkey_free(public); 2860 exit(0); 2861 } 2862