1 /* $OpenBSD: ssh-keygen.c,v 1.329 2019/03/25 16:19:44 dtucker Exp $ */ 2 /* 3 * Author: Tatu Ylonen <ylo@cs.hut.fi> 4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * Identity and host key generation and maintenance. 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 */ 14 15 #include "includes.h" 16 17 #include <sys/types.h> 18 #include <sys/socket.h> 19 #include <sys/stat.h> 20 21 #ifdef WITH_OPENSSL 22 #include <openssl/evp.h> 23 #include <openssl/pem.h> 24 #include "openbsd-compat/openssl-compat.h" 25 #endif 26 27 #include <errno.h> 28 #include <fcntl.h> 29 #include <netdb.h> 30 #ifdef HAVE_PATHS_H 31 # include <paths.h> 32 #endif 33 #include <pwd.h> 34 #include <stdarg.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 #include <limits.h> 40 #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 /* 71 * Default number of bits in the RSA, DSA and ECDSA keys. These value can be 72 * overridden on the command line. 73 * 74 * These values, with the exception of DSA, provide security equivalent to at 75 * least 128 bits of security according to NIST Special Publication 800-57: 76 * Recommendation for Key Management Part 1 rev 4 section 5.6.1. 77 * For DSA it (and FIPS-186-4 section 4.2) specifies that the only size for 78 * which a 160bit hash is acceptable is 1kbit, and since ssh-dss specifies only 79 * SHA1 we limit the DSA key size 1k bits. 80 */ 81 #define DEFAULT_BITS 3072 82 #define DEFAULT_BITS_DSA 1024 83 #define DEFAULT_BITS_ECDSA 256 84 85 static int quiet = 0; 86 87 /* Flag indicating that we just want to see the key fingerprint */ 88 static int print_fingerprint = 0; 89 static int print_bubblebabble = 0; 90 91 /* Hash algorithm to use for fingerprints. */ 92 static int fingerprint_hash = SSH_FP_HASH_DEFAULT; 93 94 /* The identity file name, given on the command line or entered by the user. */ 95 static char identity_file[1024]; 96 static int have_identity = 0; 97 98 /* This is set to the passphrase if given on the command line. */ 99 static char *identity_passphrase = NULL; 100 101 /* This is set to the new passphrase if given on the command line. */ 102 static char *identity_new_passphrase = NULL; 103 104 /* Key type when certifying */ 105 static u_int cert_key_type = SSH2_CERT_TYPE_USER; 106 107 /* "key ID" of signed key */ 108 static char *cert_key_id = NULL; 109 110 /* Comma-separated list of principal names for certifying keys */ 111 static char *cert_principals = NULL; 112 113 /* Validity period for certificates */ 114 static u_int64_t cert_valid_from = 0; 115 static u_int64_t cert_valid_to = ~0ULL; 116 117 /* Certificate options */ 118 #define CERTOPT_X_FWD (1) 119 #define CERTOPT_AGENT_FWD (1<<1) 120 #define CERTOPT_PORT_FWD (1<<2) 121 #define CERTOPT_PTY (1<<3) 122 #define CERTOPT_USER_RC (1<<4) 123 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 124 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 125 static u_int32_t certflags_flags = CERTOPT_DEFAULT; 126 static char *certflags_command = NULL; 127 static char *certflags_src_addr = NULL; 128 129 /* Arbitrary extensions specified by user */ 130 struct cert_userext { 131 char *key; 132 char *val; 133 int crit; 134 }; 135 static struct cert_userext *cert_userext; 136 static size_t ncert_userext; 137 138 /* Conversion to/from various formats */ 139 enum { 140 FMT_RFC4716, 141 FMT_PKCS8, 142 FMT_PEM 143 } convert_format = FMT_RFC4716; 144 145 static char *key_type_name = NULL; 146 147 /* Load key from this PKCS#11 provider */ 148 static char *pkcs11provider = NULL; 149 150 /* Use new OpenSSH private key format when writing SSH2 keys instead of PEM */ 151 static int use_new_format = 1; 152 153 /* Cipher for new-format private keys */ 154 static char *new_format_cipher = NULL; 155 156 /* 157 * Number of KDF rounds to derive new format keys / 158 * number of primality trials when screening moduli. 159 */ 160 static int rounds = 0; 161 162 /* argv0 */ 163 extern char *__progname; 164 165 static char hostname[NI_MAXHOST]; 166 167 #ifdef WITH_OPENSSL 168 /* moduli.c */ 169 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 170 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 171 unsigned long); 172 #endif 173 174 static void 175 type_bits_valid(int type, const char *name, u_int32_t *bitsp) 176 { 177 #ifdef WITH_OPENSSL 178 u_int maxbits, nid; 179 #endif 180 181 if (type == KEY_UNSPEC) 182 fatal("unknown key type %s", key_type_name); 183 if (*bitsp == 0) { 184 #ifdef WITH_OPENSSL 185 if (type == KEY_DSA) 186 *bitsp = DEFAULT_BITS_DSA; 187 else if (type == KEY_ECDSA) { 188 if (name != NULL && 189 (nid = sshkey_ecdsa_nid_from_name(name)) > 0) 190 *bitsp = sshkey_curve_nid_to_bits(nid); 191 if (*bitsp == 0) 192 *bitsp = DEFAULT_BITS_ECDSA; 193 } else 194 #endif 195 *bitsp = DEFAULT_BITS; 196 } 197 #ifdef WITH_OPENSSL 198 maxbits = (type == KEY_DSA) ? 199 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 200 if (*bitsp > maxbits) 201 fatal("key bits exceeds maximum %d", maxbits); 202 switch (type) { 203 case KEY_DSA: 204 if (*bitsp != 1024) 205 fatal("Invalid DSA key length: must be 1024 bits"); 206 break; 207 case KEY_RSA: 208 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE) 209 fatal("Invalid RSA key length: minimum is %d bits", 210 SSH_RSA_MINIMUM_MODULUS_SIZE); 211 break; 212 case KEY_ECDSA: 213 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1) 214 fatal("Invalid ECDSA key length: valid lengths are " 215 #ifdef OPENSSL_HAS_NISTP521 216 "256, 384 or 521 bits"); 217 #else 218 "256 or 384 bits"); 219 #endif 220 } 221 #endif 222 } 223 224 static void 225 ask_filename(struct passwd *pw, const char *prompt) 226 { 227 char buf[1024]; 228 char *name = NULL; 229 230 if (key_type_name == NULL) 231 name = _PATH_SSH_CLIENT_ID_RSA; 232 else { 233 switch (sshkey_type_from_name(key_type_name)) { 234 case KEY_DSA_CERT: 235 case KEY_DSA: 236 name = _PATH_SSH_CLIENT_ID_DSA; 237 break; 238 #ifdef OPENSSL_HAS_ECC 239 case KEY_ECDSA_CERT: 240 case KEY_ECDSA: 241 name = _PATH_SSH_CLIENT_ID_ECDSA; 242 break; 243 #endif 244 case KEY_RSA_CERT: 245 case KEY_RSA: 246 name = _PATH_SSH_CLIENT_ID_RSA; 247 break; 248 case KEY_ED25519: 249 case KEY_ED25519_CERT: 250 name = _PATH_SSH_CLIENT_ID_ED25519; 251 break; 252 case KEY_XMSS: 253 case KEY_XMSS_CERT: 254 name = _PATH_SSH_CLIENT_ID_XMSS; 255 break; 256 default: 257 fatal("bad key type"); 258 } 259 } 260 snprintf(identity_file, sizeof(identity_file), 261 "%s/%s", pw->pw_dir, name); 262 printf("%s (%s): ", prompt, identity_file); 263 fflush(stdout); 264 if (fgets(buf, sizeof(buf), stdin) == NULL) 265 exit(1); 266 buf[strcspn(buf, "\n")] = '\0'; 267 if (strcmp(buf, "") != 0) 268 strlcpy(identity_file, buf, sizeof(identity_file)); 269 have_identity = 1; 270 } 271 272 static struct sshkey * 273 load_identity(char *filename) 274 { 275 char *pass; 276 struct sshkey *prv; 277 int r; 278 279 if ((r = sshkey_load_private(filename, "", &prv, NULL)) == 0) 280 return prv; 281 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 282 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 283 if (identity_passphrase) 284 pass = xstrdup(identity_passphrase); 285 else 286 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN); 287 r = sshkey_load_private(filename, pass, &prv, NULL); 288 explicit_bzero(pass, strlen(pass)); 289 free(pass); 290 if (r != 0) 291 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 292 return prv; 293 } 294 295 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 296 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 297 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 298 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 299 300 #ifdef WITH_OPENSSL 301 static void 302 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k) 303 { 304 size_t len; 305 u_char *blob; 306 char comment[61]; 307 int r; 308 309 if ((r = sshkey_to_blob(k, &blob, &len)) != 0) 310 fatal("key_to_blob failed: %s", ssh_err(r)); 311 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 312 snprintf(comment, sizeof(comment), 313 "%u-bit %s, converted by %s@%s from OpenSSH", 314 sshkey_size(k), sshkey_type(k), 315 pw->pw_name, hostname); 316 317 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 318 fprintf(stdout, "Comment: \"%s\"\n", comment); 319 dump_base64(stdout, blob, len); 320 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 321 sshkey_free(k); 322 free(blob); 323 exit(0); 324 } 325 326 static void 327 do_convert_to_pkcs8(struct sshkey *k) 328 { 329 switch (sshkey_type_plain(k->type)) { 330 case KEY_RSA: 331 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 332 fatal("PEM_write_RSA_PUBKEY failed"); 333 break; 334 case KEY_DSA: 335 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 336 fatal("PEM_write_DSA_PUBKEY failed"); 337 break; 338 #ifdef OPENSSL_HAS_ECC 339 case KEY_ECDSA: 340 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 341 fatal("PEM_write_EC_PUBKEY failed"); 342 break; 343 #endif 344 default: 345 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 346 } 347 exit(0); 348 } 349 350 static void 351 do_convert_to_pem(struct sshkey *k) 352 { 353 switch (sshkey_type_plain(k->type)) { 354 case KEY_RSA: 355 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 356 fatal("PEM_write_RSAPublicKey failed"); 357 break; 358 default: 359 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 360 } 361 exit(0); 362 } 363 364 static void 365 do_convert_to(struct passwd *pw) 366 { 367 struct sshkey *k; 368 struct stat st; 369 int r; 370 371 if (!have_identity) 372 ask_filename(pw, "Enter file in which the key is"); 373 if (stat(identity_file, &st) < 0) 374 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 375 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0) 376 k = load_identity(identity_file); 377 switch (convert_format) { 378 case FMT_RFC4716: 379 do_convert_to_ssh2(pw, k); 380 break; 381 case FMT_PKCS8: 382 do_convert_to_pkcs8(k); 383 break; 384 case FMT_PEM: 385 do_convert_to_pem(k); 386 break; 387 default: 388 fatal("%s: unknown key format %d", __func__, convert_format); 389 } 390 exit(0); 391 } 392 393 /* 394 * This is almost exactly the bignum1 encoding, but with 32 bit for length 395 * instead of 16. 396 */ 397 static void 398 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value) 399 { 400 u_int bytes, bignum_bits; 401 int r; 402 403 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0) 404 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 405 bytes = (bignum_bits + 7) / 8; 406 if (sshbuf_len(b) < bytes) 407 fatal("%s: input buffer too small: need %d have %zu", 408 __func__, bytes, sshbuf_len(b)); 409 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL) 410 fatal("%s: BN_bin2bn failed", __func__); 411 if ((r = sshbuf_consume(b, bytes)) != 0) 412 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 413 } 414 415 static struct sshkey * 416 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 417 { 418 struct sshbuf *b; 419 struct sshkey *key = NULL; 420 char *type, *cipher; 421 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345"; 422 int r, rlen, ktype; 423 u_int magic, i1, i2, i3, i4; 424 size_t slen; 425 u_long e; 426 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL; 427 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL; 428 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL; 429 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL; 430 if ((b = sshbuf_from(blob, blen)) == NULL) 431 fatal("%s: sshbuf_from failed", __func__); 432 if ((r = sshbuf_get_u32(b, &magic)) != 0) 433 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 434 435 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 436 error("bad magic 0x%x != 0x%x", magic, 437 SSH_COM_PRIVATE_KEY_MAGIC); 438 sshbuf_free(b); 439 return NULL; 440 } 441 if ((r = sshbuf_get_u32(b, &i1)) != 0 || 442 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 443 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 || 444 (r = sshbuf_get_u32(b, &i2)) != 0 || 445 (r = sshbuf_get_u32(b, &i3)) != 0 || 446 (r = sshbuf_get_u32(b, &i4)) != 0) 447 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 448 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 449 if (strcmp(cipher, "none") != 0) { 450 error("unsupported cipher %s", cipher); 451 free(cipher); 452 sshbuf_free(b); 453 free(type); 454 return NULL; 455 } 456 free(cipher); 457 458 if (strstr(type, "dsa")) { 459 ktype = KEY_DSA; 460 } else if (strstr(type, "rsa")) { 461 ktype = KEY_RSA; 462 } else { 463 sshbuf_free(b); 464 free(type); 465 return NULL; 466 } 467 if ((key = sshkey_new(ktype)) == NULL) 468 fatal("sshkey_new failed"); 469 free(type); 470 471 switch (key->type) { 472 case KEY_DSA: 473 if ((dsa_p = BN_new()) == NULL || 474 (dsa_q = BN_new()) == NULL || 475 (dsa_g = BN_new()) == NULL || 476 (dsa_pub_key = BN_new()) == NULL || 477 (dsa_priv_key = BN_new()) == NULL) 478 fatal("%s: BN_new", __func__); 479 buffer_get_bignum_bits(b, dsa_p); 480 buffer_get_bignum_bits(b, dsa_g); 481 buffer_get_bignum_bits(b, dsa_q); 482 buffer_get_bignum_bits(b, dsa_pub_key); 483 buffer_get_bignum_bits(b, dsa_priv_key); 484 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) 485 fatal("%s: DSA_set0_pqg failed", __func__); 486 dsa_p = dsa_q = dsa_g = NULL; /* transferred */ 487 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key)) 488 fatal("%s: DSA_set0_key failed", __func__); 489 dsa_pub_key = dsa_priv_key = NULL; /* transferred */ 490 break; 491 case KEY_RSA: 492 if ((r = sshbuf_get_u8(b, &e1)) != 0 || 493 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) || 494 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0)) 495 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 496 e = e1; 497 debug("e %lx", e); 498 if (e < 30) { 499 e <<= 8; 500 e += e2; 501 debug("e %lx", e); 502 e <<= 8; 503 e += e3; 504 debug("e %lx", e); 505 } 506 if ((rsa_e = BN_new()) == NULL) 507 fatal("%s: BN_new", __func__); 508 if (!BN_set_word(rsa_e, e)) { 509 BN_clear_free(rsa_e); 510 sshbuf_free(b); 511 sshkey_free(key); 512 return NULL; 513 } 514 if ((rsa_n = BN_new()) == NULL || 515 (rsa_d = BN_new()) == NULL || 516 (rsa_p = BN_new()) == NULL || 517 (rsa_q = BN_new()) == NULL || 518 (rsa_iqmp = BN_new()) == NULL) 519 fatal("%s: BN_new", __func__); 520 buffer_get_bignum_bits(b, rsa_d); 521 buffer_get_bignum_bits(b, rsa_n); 522 buffer_get_bignum_bits(b, rsa_iqmp); 523 buffer_get_bignum_bits(b, rsa_q); 524 buffer_get_bignum_bits(b, rsa_p); 525 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d)) 526 fatal("%s: RSA_set0_key failed", __func__); 527 rsa_n = rsa_e = rsa_d = NULL; /* transferred */ 528 if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q)) 529 fatal("%s: RSA_set0_factors failed", __func__); 530 rsa_p = rsa_q = NULL; /* transferred */ 531 if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0) 532 fatal("generate RSA parameters failed: %s", ssh_err(r)); 533 BN_clear_free(rsa_iqmp); 534 break; 535 } 536 rlen = sshbuf_len(b); 537 if (rlen != 0) 538 error("do_convert_private_ssh2_from_blob: " 539 "remaining bytes in key blob %d", rlen); 540 sshbuf_free(b); 541 542 /* try the key */ 543 if (sshkey_sign(key, &sig, &slen, data, sizeof(data), NULL, 0) != 0 || 544 sshkey_verify(key, sig, slen, data, sizeof(data), NULL, 0) != 0) { 545 sshkey_free(key); 546 free(sig); 547 return NULL; 548 } 549 free(sig); 550 return key; 551 } 552 553 static int 554 get_line(FILE *fp, char *line, size_t len) 555 { 556 int c; 557 size_t pos = 0; 558 559 line[0] = '\0'; 560 while ((c = fgetc(fp)) != EOF) { 561 if (pos >= len - 1) 562 fatal("input line too long."); 563 switch (c) { 564 case '\r': 565 c = fgetc(fp); 566 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) 567 fatal("unget: %s", strerror(errno)); 568 return pos; 569 case '\n': 570 return pos; 571 } 572 line[pos++] = c; 573 line[pos] = '\0'; 574 } 575 /* We reached EOF */ 576 return -1; 577 } 578 579 static void 580 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private) 581 { 582 int r, blen, escaped = 0; 583 u_int len; 584 char line[1024]; 585 u_char blob[8096]; 586 char encoded[8096]; 587 FILE *fp; 588 589 if ((fp = fopen(identity_file, "r")) == NULL) 590 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 591 encoded[0] = '\0'; 592 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 593 if (blen > 0 && line[blen - 1] == '\\') 594 escaped++; 595 if (strncmp(line, "----", 4) == 0 || 596 strstr(line, ": ") != NULL) { 597 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 598 *private = 1; 599 if (strstr(line, " END ") != NULL) { 600 break; 601 } 602 /* fprintf(stderr, "ignore: %s", line); */ 603 continue; 604 } 605 if (escaped) { 606 escaped--; 607 /* fprintf(stderr, "escaped: %s", line); */ 608 continue; 609 } 610 strlcat(encoded, line, sizeof(encoded)); 611 } 612 len = strlen(encoded); 613 if (((len % 4) == 3) && 614 (encoded[len-1] == '=') && 615 (encoded[len-2] == '=') && 616 (encoded[len-3] == '=')) 617 encoded[len-3] = '\0'; 618 blen = uudecode(encoded, blob, sizeof(blob)); 619 if (blen < 0) 620 fatal("uudecode failed."); 621 if (*private) 622 *k = do_convert_private_ssh2_from_blob(blob, blen); 623 else if ((r = sshkey_from_blob(blob, blen, k)) != 0) 624 fatal("decode blob failed: %s", ssh_err(r)); 625 fclose(fp); 626 } 627 628 static void 629 do_convert_from_pkcs8(struct sshkey **k, int *private) 630 { 631 EVP_PKEY *pubkey; 632 FILE *fp; 633 634 if ((fp = fopen(identity_file, "r")) == NULL) 635 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 636 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 637 fatal("%s: %s is not a recognised public key format", __func__, 638 identity_file); 639 } 640 fclose(fp); 641 switch (EVP_PKEY_base_id(pubkey)) { 642 case EVP_PKEY_RSA: 643 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 644 fatal("sshkey_new failed"); 645 (*k)->type = KEY_RSA; 646 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 647 break; 648 case EVP_PKEY_DSA: 649 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 650 fatal("sshkey_new failed"); 651 (*k)->type = KEY_DSA; 652 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 653 break; 654 #ifdef OPENSSL_HAS_ECC 655 case EVP_PKEY_EC: 656 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 657 fatal("sshkey_new failed"); 658 (*k)->type = KEY_ECDSA; 659 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 660 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa); 661 break; 662 #endif 663 default: 664 fatal("%s: unsupported pubkey type %d", __func__, 665 EVP_PKEY_base_id(pubkey)); 666 } 667 EVP_PKEY_free(pubkey); 668 return; 669 } 670 671 static void 672 do_convert_from_pem(struct sshkey **k, int *private) 673 { 674 FILE *fp; 675 RSA *rsa; 676 677 if ((fp = fopen(identity_file, "r")) == NULL) 678 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 679 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 680 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 681 fatal("sshkey_new failed"); 682 (*k)->type = KEY_RSA; 683 (*k)->rsa = rsa; 684 fclose(fp); 685 return; 686 } 687 fatal("%s: unrecognised raw private key format", __func__); 688 } 689 690 static void 691 do_convert_from(struct passwd *pw) 692 { 693 struct sshkey *k = NULL; 694 int r, private = 0, ok = 0; 695 struct stat st; 696 697 if (!have_identity) 698 ask_filename(pw, "Enter file in which the key is"); 699 if (stat(identity_file, &st) < 0) 700 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 701 702 switch (convert_format) { 703 case FMT_RFC4716: 704 do_convert_from_ssh2(pw, &k, &private); 705 break; 706 case FMT_PKCS8: 707 do_convert_from_pkcs8(&k, &private); 708 break; 709 case FMT_PEM: 710 do_convert_from_pem(&k, &private); 711 break; 712 default: 713 fatal("%s: unknown key format %d", __func__, convert_format); 714 } 715 716 if (!private) { 717 if ((r = sshkey_write(k, stdout)) == 0) 718 ok = 1; 719 if (ok) 720 fprintf(stdout, "\n"); 721 } else { 722 switch (k->type) { 723 case KEY_DSA: 724 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 725 NULL, 0, NULL, NULL); 726 break; 727 #ifdef OPENSSL_HAS_ECC 728 case KEY_ECDSA: 729 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 730 NULL, 0, NULL, NULL); 731 break; 732 #endif 733 case KEY_RSA: 734 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 735 NULL, 0, NULL, NULL); 736 break; 737 default: 738 fatal("%s: unsupported key type %s", __func__, 739 sshkey_type(k)); 740 } 741 } 742 743 if (!ok) 744 fatal("key write failed"); 745 sshkey_free(k); 746 exit(0); 747 } 748 #endif 749 750 static void 751 do_print_public(struct passwd *pw) 752 { 753 struct sshkey *prv; 754 struct stat st; 755 int r; 756 757 if (!have_identity) 758 ask_filename(pw, "Enter file in which the key is"); 759 if (stat(identity_file, &st) < 0) 760 fatal("%s: %s", identity_file, strerror(errno)); 761 prv = load_identity(identity_file); 762 if ((r = sshkey_write(prv, stdout)) != 0) 763 error("sshkey_write failed: %s", ssh_err(r)); 764 sshkey_free(prv); 765 fprintf(stdout, "\n"); 766 exit(0); 767 } 768 769 static void 770 do_download(struct passwd *pw) 771 { 772 #ifdef ENABLE_PKCS11 773 struct sshkey **keys = NULL; 774 int i, nkeys; 775 enum sshkey_fp_rep rep; 776 int fptype; 777 char *fp, *ra; 778 779 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 780 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 781 782 pkcs11_init(1); 783 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 784 if (nkeys <= 0) 785 fatal("cannot read public key from pkcs11"); 786 for (i = 0; i < nkeys; i++) { 787 if (print_fingerprint) { 788 fp = sshkey_fingerprint(keys[i], fptype, rep); 789 ra = sshkey_fingerprint(keys[i], fingerprint_hash, 790 SSH_FP_RANDOMART); 791 if (fp == NULL || ra == NULL) 792 fatal("%s: sshkey_fingerprint fail", __func__); 793 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]), 794 fp, sshkey_type(keys[i])); 795 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 796 printf("%s\n", ra); 797 free(ra); 798 free(fp); 799 } else { 800 (void) sshkey_write(keys[i], stdout); /* XXX check */ 801 fprintf(stdout, "\n"); 802 } 803 sshkey_free(keys[i]); 804 } 805 free(keys); 806 pkcs11_terminate(); 807 exit(0); 808 #else 809 fatal("no pkcs11 support"); 810 #endif /* ENABLE_PKCS11 */ 811 } 812 813 static struct sshkey * 814 try_read_key(char **cpp) 815 { 816 struct sshkey *ret; 817 int r; 818 819 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL) 820 fatal("sshkey_new failed"); 821 if ((r = sshkey_read(ret, cpp)) == 0) 822 return ret; 823 /* Not a key */ 824 sshkey_free(ret); 825 return NULL; 826 } 827 828 static void 829 fingerprint_one_key(const struct sshkey *public, const char *comment) 830 { 831 char *fp = NULL, *ra = NULL; 832 enum sshkey_fp_rep rep; 833 int fptype; 834 835 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 836 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 837 fp = sshkey_fingerprint(public, fptype, rep); 838 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART); 839 if (fp == NULL || ra == NULL) 840 fatal("%s: sshkey_fingerprint failed", __func__); 841 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp, 842 comment ? comment : "no comment", sshkey_type(public)); 843 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 844 printf("%s\n", ra); 845 free(ra); 846 free(fp); 847 } 848 849 static void 850 fingerprint_private(const char *path) 851 { 852 struct stat st; 853 char *comment = NULL; 854 struct sshkey *public = NULL; 855 int r; 856 857 if (stat(identity_file, &st) < 0) 858 fatal("%s: %s", path, strerror(errno)); 859 if ((r = sshkey_load_public(path, &public, &comment)) != 0) { 860 debug("load public \"%s\": %s", path, ssh_err(r)); 861 if ((r = sshkey_load_private(path, NULL, 862 &public, &comment)) != 0) { 863 debug("load private \"%s\": %s", path, ssh_err(r)); 864 fatal("%s is not a key file.", path); 865 } 866 } 867 868 fingerprint_one_key(public, comment); 869 sshkey_free(public); 870 free(comment); 871 } 872 873 static void 874 do_fingerprint(struct passwd *pw) 875 { 876 FILE *f; 877 struct sshkey *public = NULL; 878 char *comment = NULL, *cp, *ep, *line = NULL; 879 size_t linesize = 0; 880 int i, invalid = 1; 881 const char *path; 882 u_long lnum = 0; 883 884 if (!have_identity) 885 ask_filename(pw, "Enter file in which the key is"); 886 path = identity_file; 887 888 if (strcmp(identity_file, "-") == 0) { 889 f = stdin; 890 path = "(stdin)"; 891 } else if ((f = fopen(path, "r")) == NULL) 892 fatal("%s: %s: %s", __progname, path, strerror(errno)); 893 894 while (getline(&line, &linesize, f) != -1) { 895 lnum++; 896 cp = line; 897 cp[strcspn(cp, "\n")] = '\0'; 898 /* Trim leading space and comments */ 899 cp = line + strspn(line, " \t"); 900 if (*cp == '#' || *cp == '\0') 901 continue; 902 903 /* 904 * Input may be plain keys, private keys, authorized_keys 905 * or known_hosts. 906 */ 907 908 /* 909 * Try private keys first. Assume a key is private if 910 * "SSH PRIVATE KEY" appears on the first line and we're 911 * not reading from stdin (XXX support private keys on stdin). 912 */ 913 if (lnum == 1 && strcmp(identity_file, "-") != 0 && 914 strstr(cp, "PRIVATE KEY") != NULL) { 915 free(line); 916 fclose(f); 917 fingerprint_private(path); 918 exit(0); 919 } 920 921 /* 922 * If it's not a private key, then this must be prepared to 923 * accept a public key prefixed with a hostname or options. 924 * Try a bare key first, otherwise skip the leading stuff. 925 */ 926 if ((public = try_read_key(&cp)) == NULL) { 927 i = strtol(cp, &ep, 10); 928 if (i == 0 || ep == NULL || 929 (*ep != ' ' && *ep != '\t')) { 930 int quoted = 0; 931 932 comment = cp; 933 for (; *cp && (quoted || (*cp != ' ' && 934 *cp != '\t')); cp++) { 935 if (*cp == '\\' && cp[1] == '"') 936 cp++; /* Skip both */ 937 else if (*cp == '"') 938 quoted = !quoted; 939 } 940 if (!*cp) 941 continue; 942 *cp++ = '\0'; 943 } 944 } 945 /* Retry after parsing leading hostname/key options */ 946 if (public == NULL && (public = try_read_key(&cp)) == NULL) { 947 debug("%s:%lu: not a public key", path, lnum); 948 continue; 949 } 950 951 /* Find trailing comment, if any */ 952 for (; *cp == ' ' || *cp == '\t'; cp++) 953 ; 954 if (*cp != '\0' && *cp != '#') 955 comment = cp; 956 957 fingerprint_one_key(public, comment); 958 sshkey_free(public); 959 invalid = 0; /* One good key in the file is sufficient */ 960 } 961 fclose(f); 962 free(line); 963 964 if (invalid) 965 fatal("%s is not a public key file.", path); 966 exit(0); 967 } 968 969 static void 970 do_gen_all_hostkeys(struct passwd *pw) 971 { 972 struct { 973 char *key_type; 974 char *key_type_display; 975 char *path; 976 } key_types[] = { 977 #ifdef WITH_OPENSSL 978 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 979 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 980 #ifdef OPENSSL_HAS_ECC 981 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 982 #endif /* OPENSSL_HAS_ECC */ 983 #endif /* WITH_OPENSSL */ 984 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE }, 985 #ifdef WITH_XMSS 986 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE }, 987 #endif /* WITH_XMSS */ 988 { NULL, NULL, NULL } 989 }; 990 991 u_int bits = 0; 992 int first = 0; 993 struct stat st; 994 struct sshkey *private, *public; 995 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file; 996 int i, type, fd, r; 997 FILE *f; 998 999 for (i = 0; key_types[i].key_type; i++) { 1000 public = private = NULL; 1001 prv_tmp = pub_tmp = prv_file = pub_file = NULL; 1002 1003 xasprintf(&prv_file, "%s%s", 1004 identity_file, key_types[i].path); 1005 1006 /* Check whether private key exists and is not zero-length */ 1007 if (stat(prv_file, &st) == 0) { 1008 if (st.st_size != 0) 1009 goto next; 1010 } else if (errno != ENOENT) { 1011 error("Could not stat %s: %s", key_types[i].path, 1012 strerror(errno)); 1013 goto failnext; 1014 } 1015 1016 /* 1017 * Private key doesn't exist or is invalid; proceed with 1018 * key generation. 1019 */ 1020 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX", 1021 identity_file, key_types[i].path); 1022 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX", 1023 identity_file, key_types[i].path); 1024 xasprintf(&pub_file, "%s%s.pub", 1025 identity_file, key_types[i].path); 1026 1027 if (first == 0) { 1028 first = 1; 1029 printf("%s: generating new host keys: ", __progname); 1030 } 1031 printf("%s ", key_types[i].key_type_display); 1032 fflush(stdout); 1033 type = sshkey_type_from_name(key_types[i].key_type); 1034 if ((fd = mkstemp(prv_tmp)) == -1) { 1035 error("Could not save your public key in %s: %s", 1036 prv_tmp, strerror(errno)); 1037 goto failnext; 1038 } 1039 close(fd); /* just using mkstemp() to generate/reserve a name */ 1040 bits = 0; 1041 type_bits_valid(type, NULL, &bits); 1042 if ((r = sshkey_generate(type, bits, &private)) != 0) { 1043 error("sshkey_generate failed: %s", ssh_err(r)); 1044 goto failnext; 1045 } 1046 if ((r = sshkey_from_private(private, &public)) != 0) 1047 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1048 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 1049 hostname); 1050 if ((r = sshkey_save_private(private, prv_tmp, "", 1051 comment, use_new_format, new_format_cipher, rounds)) != 0) { 1052 error("Saving key \"%s\" failed: %s", 1053 prv_tmp, ssh_err(r)); 1054 goto failnext; 1055 } 1056 if ((fd = mkstemp(pub_tmp)) == -1) { 1057 error("Could not save your public key in %s: %s", 1058 pub_tmp, strerror(errno)); 1059 goto failnext; 1060 } 1061 (void)fchmod(fd, 0644); 1062 f = fdopen(fd, "w"); 1063 if (f == NULL) { 1064 error("fdopen %s failed: %s", pub_tmp, strerror(errno)); 1065 close(fd); 1066 goto failnext; 1067 } 1068 if ((r = sshkey_write(public, f)) != 0) { 1069 error("write key failed: %s", ssh_err(r)); 1070 fclose(f); 1071 goto failnext; 1072 } 1073 fprintf(f, " %s\n", comment); 1074 if (ferror(f) != 0) { 1075 error("write key failed: %s", strerror(errno)); 1076 fclose(f); 1077 goto failnext; 1078 } 1079 if (fclose(f) != 0) { 1080 error("key close failed: %s", strerror(errno)); 1081 goto failnext; 1082 } 1083 1084 /* Rename temporary files to their permanent locations. */ 1085 if (rename(pub_tmp, pub_file) != 0) { 1086 error("Unable to move %s into position: %s", 1087 pub_file, strerror(errno)); 1088 goto failnext; 1089 } 1090 if (rename(prv_tmp, prv_file) != 0) { 1091 error("Unable to move %s into position: %s", 1092 key_types[i].path, strerror(errno)); 1093 failnext: 1094 first = 0; 1095 goto next; 1096 } 1097 next: 1098 sshkey_free(private); 1099 sshkey_free(public); 1100 free(prv_tmp); 1101 free(pub_tmp); 1102 free(prv_file); 1103 free(pub_file); 1104 } 1105 if (first != 0) 1106 printf("\n"); 1107 } 1108 1109 struct known_hosts_ctx { 1110 const char *host; /* Hostname searched for in find/delete case */ 1111 FILE *out; /* Output file, stdout for find_hosts case */ 1112 int has_unhashed; /* When hashing, original had unhashed hosts */ 1113 int found_key; /* For find/delete, host was found */ 1114 int invalid; /* File contained invalid items; don't delete */ 1115 int hash_hosts; /* Hash hostnames as we go */ 1116 int find_host; /* Search for specific hostname */ 1117 int delete_host; /* Delete host from known_hosts */ 1118 }; 1119 1120 static int 1121 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx) 1122 { 1123 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1124 char *hashed, *cp, *hosts, *ohosts; 1125 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts); 1126 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM; 1127 1128 switch (l->status) { 1129 case HKF_STATUS_OK: 1130 case HKF_STATUS_MATCHED: 1131 /* 1132 * Don't hash hosts already already hashed, with wildcard 1133 * characters or a CA/revocation marker. 1134 */ 1135 if (was_hashed || has_wild || l->marker != MRK_NONE) { 1136 fprintf(ctx->out, "%s\n", l->line); 1137 if (has_wild && !ctx->find_host) { 1138 logit("%s:%lu: ignoring host name " 1139 "with wildcard: %.64s", l->path, 1140 l->linenum, l->hosts); 1141 } 1142 return 0; 1143 } 1144 /* 1145 * Split any comma-separated hostnames from the host list, 1146 * hash and store separately. 1147 */ 1148 ohosts = hosts = xstrdup(l->hosts); 1149 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') { 1150 lowercase(cp); 1151 if ((hashed = host_hash(cp, NULL, 0)) == NULL) 1152 fatal("hash_host failed"); 1153 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey); 1154 ctx->has_unhashed = 1; 1155 } 1156 free(ohosts); 1157 return 0; 1158 case HKF_STATUS_INVALID: 1159 /* Retain invalid lines, but mark file as invalid. */ 1160 ctx->invalid = 1; 1161 logit("%s:%lu: invalid line", l->path, l->linenum); 1162 /* FALLTHROUGH */ 1163 default: 1164 fprintf(ctx->out, "%s\n", l->line); 1165 return 0; 1166 } 1167 /* NOTREACHED */ 1168 return -1; 1169 } 1170 1171 static int 1172 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx) 1173 { 1174 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1175 enum sshkey_fp_rep rep; 1176 int fptype; 1177 char *fp; 1178 1179 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 1180 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 1181 1182 if (l->status == HKF_STATUS_MATCHED) { 1183 if (ctx->delete_host) { 1184 if (l->marker != MRK_NONE) { 1185 /* Don't remove CA and revocation lines */ 1186 fprintf(ctx->out, "%s\n", l->line); 1187 } else { 1188 /* 1189 * Hostname matches and has no CA/revoke 1190 * marker, delete it by *not* writing the 1191 * line to ctx->out. 1192 */ 1193 ctx->found_key = 1; 1194 if (!quiet) 1195 printf("# Host %s found: line %lu\n", 1196 ctx->host, l->linenum); 1197 } 1198 return 0; 1199 } else if (ctx->find_host) { 1200 ctx->found_key = 1; 1201 if (!quiet) { 1202 printf("# Host %s found: line %lu %s\n", 1203 ctx->host, 1204 l->linenum, l->marker == MRK_CA ? "CA" : 1205 (l->marker == MRK_REVOKE ? "REVOKED" : "")); 1206 } 1207 if (ctx->hash_hosts) 1208 known_hosts_hash(l, ctx); 1209 else if (print_fingerprint) { 1210 fp = sshkey_fingerprint(l->key, fptype, rep); 1211 mprintf("%s %s %s %s\n", ctx->host, 1212 sshkey_type(l->key), fp, l->comment); 1213 free(fp); 1214 } else 1215 fprintf(ctx->out, "%s\n", l->line); 1216 return 0; 1217 } 1218 } else if (ctx->delete_host) { 1219 /* Retain non-matching hosts when deleting */ 1220 if (l->status == HKF_STATUS_INVALID) { 1221 ctx->invalid = 1; 1222 logit("%s:%lu: invalid line", l->path, l->linenum); 1223 } 1224 fprintf(ctx->out, "%s\n", l->line); 1225 } 1226 return 0; 1227 } 1228 1229 static void 1230 do_known_hosts(struct passwd *pw, const char *name, int find_host, 1231 int delete_host, int hash_hosts) 1232 { 1233 char *cp, tmp[PATH_MAX], old[PATH_MAX]; 1234 int r, fd, oerrno, inplace = 0; 1235 struct known_hosts_ctx ctx; 1236 u_int foreach_options; 1237 1238 if (!have_identity) { 1239 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1240 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1241 sizeof(identity_file)) 1242 fatal("Specified known hosts path too long"); 1243 free(cp); 1244 have_identity = 1; 1245 } 1246 1247 memset(&ctx, 0, sizeof(ctx)); 1248 ctx.out = stdout; 1249 ctx.host = name; 1250 ctx.hash_hosts = hash_hosts; 1251 ctx.find_host = find_host; 1252 ctx.delete_host = delete_host; 1253 1254 /* 1255 * Find hosts goes to stdout, hash and deletions happen in-place 1256 * A corner case is ssh-keygen -HF foo, which should go to stdout 1257 */ 1258 if (!find_host && (hash_hosts || delete_host)) { 1259 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1260 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1261 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1262 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1263 fatal("known_hosts path too long"); 1264 umask(077); 1265 if ((fd = mkstemp(tmp)) == -1) 1266 fatal("mkstemp: %s", strerror(errno)); 1267 if ((ctx.out = fdopen(fd, "w")) == NULL) { 1268 oerrno = errno; 1269 unlink(tmp); 1270 fatal("fdopen: %s", strerror(oerrno)); 1271 } 1272 inplace = 1; 1273 } 1274 /* XXX support identity_file == "-" for stdin */ 1275 foreach_options = find_host ? HKF_WANT_MATCH : 0; 1276 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0; 1277 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ? 1278 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL, 1279 foreach_options)) != 0) { 1280 if (inplace) 1281 unlink(tmp); 1282 fatal("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r)); 1283 } 1284 1285 if (inplace) 1286 fclose(ctx.out); 1287 1288 if (ctx.invalid) { 1289 error("%s is not a valid known_hosts file.", identity_file); 1290 if (inplace) { 1291 error("Not replacing existing known_hosts " 1292 "file because of errors"); 1293 unlink(tmp); 1294 } 1295 exit(1); 1296 } else if (delete_host && !ctx.found_key) { 1297 logit("Host %s not found in %s", name, identity_file); 1298 if (inplace) 1299 unlink(tmp); 1300 } else if (inplace) { 1301 /* Backup existing file */ 1302 if (unlink(old) == -1 && errno != ENOENT) 1303 fatal("unlink %.100s: %s", old, strerror(errno)); 1304 if (link(identity_file, old) == -1) 1305 fatal("link %.100s to %.100s: %s", identity_file, old, 1306 strerror(errno)); 1307 /* Move new one into place */ 1308 if (rename(tmp, identity_file) == -1) { 1309 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1310 strerror(errno)); 1311 unlink(tmp); 1312 unlink(old); 1313 exit(1); 1314 } 1315 1316 printf("%s updated.\n", identity_file); 1317 printf("Original contents retained as %s\n", old); 1318 if (ctx.has_unhashed) { 1319 logit("WARNING: %s contains unhashed entries", old); 1320 logit("Delete this file to ensure privacy " 1321 "of hostnames"); 1322 } 1323 } 1324 1325 exit (find_host && !ctx.found_key); 1326 } 1327 1328 /* 1329 * Perform changing a passphrase. The argument is the passwd structure 1330 * for the current user. 1331 */ 1332 static void 1333 do_change_passphrase(struct passwd *pw) 1334 { 1335 char *comment; 1336 char *old_passphrase, *passphrase1, *passphrase2; 1337 struct stat st; 1338 struct sshkey *private; 1339 int r; 1340 1341 if (!have_identity) 1342 ask_filename(pw, "Enter file in which the key is"); 1343 if (stat(identity_file, &st) < 0) 1344 fatal("%s: %s", identity_file, strerror(errno)); 1345 /* Try to load the file with empty passphrase. */ 1346 r = sshkey_load_private(identity_file, "", &private, &comment); 1347 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) { 1348 if (identity_passphrase) 1349 old_passphrase = xstrdup(identity_passphrase); 1350 else 1351 old_passphrase = 1352 read_passphrase("Enter old passphrase: ", 1353 RP_ALLOW_STDIN); 1354 r = sshkey_load_private(identity_file, old_passphrase, 1355 &private, &comment); 1356 explicit_bzero(old_passphrase, strlen(old_passphrase)); 1357 free(old_passphrase); 1358 if (r != 0) 1359 goto badkey; 1360 } else if (r != 0) { 1361 badkey: 1362 fatal("Failed to load key %s: %s", identity_file, ssh_err(r)); 1363 } 1364 if (comment) 1365 mprintf("Key has comment '%s'\n", comment); 1366 1367 /* Ask the new passphrase (twice). */ 1368 if (identity_new_passphrase) { 1369 passphrase1 = xstrdup(identity_new_passphrase); 1370 passphrase2 = NULL; 1371 } else { 1372 passphrase1 = 1373 read_passphrase("Enter new passphrase (empty for no " 1374 "passphrase): ", RP_ALLOW_STDIN); 1375 passphrase2 = read_passphrase("Enter same passphrase again: ", 1376 RP_ALLOW_STDIN); 1377 1378 /* Verify that they are the same. */ 1379 if (strcmp(passphrase1, passphrase2) != 0) { 1380 explicit_bzero(passphrase1, strlen(passphrase1)); 1381 explicit_bzero(passphrase2, strlen(passphrase2)); 1382 free(passphrase1); 1383 free(passphrase2); 1384 printf("Pass phrases do not match. Try again.\n"); 1385 exit(1); 1386 } 1387 /* Destroy the other copy. */ 1388 explicit_bzero(passphrase2, strlen(passphrase2)); 1389 free(passphrase2); 1390 } 1391 1392 /* Save the file using the new passphrase. */ 1393 if ((r = sshkey_save_private(private, identity_file, passphrase1, 1394 comment, use_new_format, new_format_cipher, rounds)) != 0) { 1395 error("Saving key \"%s\" failed: %s.", 1396 identity_file, ssh_err(r)); 1397 explicit_bzero(passphrase1, strlen(passphrase1)); 1398 free(passphrase1); 1399 sshkey_free(private); 1400 free(comment); 1401 exit(1); 1402 } 1403 /* Destroy the passphrase and the copy of the key in memory. */ 1404 explicit_bzero(passphrase1, strlen(passphrase1)); 1405 free(passphrase1); 1406 sshkey_free(private); /* Destroys contents */ 1407 free(comment); 1408 1409 printf("Your identification has been saved with the new passphrase.\n"); 1410 exit(0); 1411 } 1412 1413 /* 1414 * Print the SSHFP RR. 1415 */ 1416 static int 1417 do_print_resource_record(struct passwd *pw, char *fname, char *hname, 1418 int print_generic) 1419 { 1420 struct sshkey *public; 1421 char *comment = NULL; 1422 struct stat st; 1423 int r; 1424 1425 if (fname == NULL) 1426 fatal("%s: no filename", __func__); 1427 if (stat(fname, &st) < 0) { 1428 if (errno == ENOENT) 1429 return 0; 1430 fatal("%s: %s", fname, strerror(errno)); 1431 } 1432 if ((r = sshkey_load_public(fname, &public, &comment)) != 0) 1433 fatal("Failed to read v2 public key from \"%s\": %s.", 1434 fname, ssh_err(r)); 1435 export_dns_rr(hname, public, stdout, print_generic); 1436 sshkey_free(public); 1437 free(comment); 1438 return 1; 1439 } 1440 1441 /* 1442 * Change the comment of a private key file. 1443 */ 1444 static void 1445 do_change_comment(struct passwd *pw, const char *identity_comment) 1446 { 1447 char new_comment[1024], *comment, *passphrase; 1448 struct sshkey *private; 1449 struct sshkey *public; 1450 struct stat st; 1451 FILE *f; 1452 int r, fd; 1453 1454 if (!have_identity) 1455 ask_filename(pw, "Enter file in which the key is"); 1456 if (stat(identity_file, &st) < 0) 1457 fatal("%s: %s", identity_file, strerror(errno)); 1458 if ((r = sshkey_load_private(identity_file, "", 1459 &private, &comment)) == 0) 1460 passphrase = xstrdup(""); 1461 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 1462 fatal("Cannot load private key \"%s\": %s.", 1463 identity_file, ssh_err(r)); 1464 else { 1465 if (identity_passphrase) 1466 passphrase = xstrdup(identity_passphrase); 1467 else if (identity_new_passphrase) 1468 passphrase = xstrdup(identity_new_passphrase); 1469 else 1470 passphrase = read_passphrase("Enter passphrase: ", 1471 RP_ALLOW_STDIN); 1472 /* Try to load using the passphrase. */ 1473 if ((r = sshkey_load_private(identity_file, passphrase, 1474 &private, &comment)) != 0) { 1475 explicit_bzero(passphrase, strlen(passphrase)); 1476 free(passphrase); 1477 fatal("Cannot load private key \"%s\": %s.", 1478 identity_file, ssh_err(r)); 1479 } 1480 } 1481 1482 if (private->type != KEY_ED25519 && private->type != KEY_XMSS && 1483 !use_new_format) { 1484 error("Comments are only supported for keys stored in " 1485 "the new format (-o)."); 1486 explicit_bzero(passphrase, strlen(passphrase)); 1487 sshkey_free(private); 1488 exit(1); 1489 } 1490 if (comment) 1491 printf("Key now has comment '%s'\n", comment); 1492 else 1493 printf("Key now has no comment\n"); 1494 1495 if (identity_comment) { 1496 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1497 } else { 1498 printf("Enter new comment: "); 1499 fflush(stdout); 1500 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1501 explicit_bzero(passphrase, strlen(passphrase)); 1502 sshkey_free(private); 1503 exit(1); 1504 } 1505 new_comment[strcspn(new_comment, "\n")] = '\0'; 1506 } 1507 1508 /* Save the file using the new passphrase. */ 1509 if ((r = sshkey_save_private(private, identity_file, passphrase, 1510 new_comment, use_new_format, new_format_cipher, rounds)) != 0) { 1511 error("Saving key \"%s\" failed: %s", 1512 identity_file, ssh_err(r)); 1513 explicit_bzero(passphrase, strlen(passphrase)); 1514 free(passphrase); 1515 sshkey_free(private); 1516 free(comment); 1517 exit(1); 1518 } 1519 explicit_bzero(passphrase, strlen(passphrase)); 1520 free(passphrase); 1521 if ((r = sshkey_from_private(private, &public)) != 0) 1522 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1523 sshkey_free(private); 1524 1525 strlcat(identity_file, ".pub", sizeof(identity_file)); 1526 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1527 if (fd == -1) 1528 fatal("Could not save your public key in %s", identity_file); 1529 f = fdopen(fd, "w"); 1530 if (f == NULL) 1531 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 1532 if ((r = sshkey_write(public, f)) != 0) 1533 fatal("write key failed: %s", ssh_err(r)); 1534 sshkey_free(public); 1535 fprintf(f, " %s\n", new_comment); 1536 fclose(f); 1537 1538 free(comment); 1539 1540 printf("The comment in your key file has been changed.\n"); 1541 exit(0); 1542 } 1543 1544 static void 1545 add_flag_option(struct sshbuf *c, const char *name) 1546 { 1547 int r; 1548 1549 debug3("%s: %s", __func__, name); 1550 if ((r = sshbuf_put_cstring(c, name)) != 0 || 1551 (r = sshbuf_put_string(c, NULL, 0)) != 0) 1552 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1553 } 1554 1555 static void 1556 add_string_option(struct sshbuf *c, const char *name, const char *value) 1557 { 1558 struct sshbuf *b; 1559 int r; 1560 1561 debug3("%s: %s=%s", __func__, name, value); 1562 if ((b = sshbuf_new()) == NULL) 1563 fatal("%s: sshbuf_new failed", __func__); 1564 if ((r = sshbuf_put_cstring(b, value)) != 0 || 1565 (r = sshbuf_put_cstring(c, name)) != 0 || 1566 (r = sshbuf_put_stringb(c, b)) != 0) 1567 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1568 1569 sshbuf_free(b); 1570 } 1571 1572 #define OPTIONS_CRITICAL 1 1573 #define OPTIONS_EXTENSIONS 2 1574 static void 1575 prepare_options_buf(struct sshbuf *c, int which) 1576 { 1577 size_t i; 1578 1579 sshbuf_reset(c); 1580 if ((which & OPTIONS_CRITICAL) != 0 && 1581 certflags_command != NULL) 1582 add_string_option(c, "force-command", certflags_command); 1583 if ((which & OPTIONS_EXTENSIONS) != 0 && 1584 (certflags_flags & CERTOPT_X_FWD) != 0) 1585 add_flag_option(c, "permit-X11-forwarding"); 1586 if ((which & OPTIONS_EXTENSIONS) != 0 && 1587 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1588 add_flag_option(c, "permit-agent-forwarding"); 1589 if ((which & OPTIONS_EXTENSIONS) != 0 && 1590 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1591 add_flag_option(c, "permit-port-forwarding"); 1592 if ((which & OPTIONS_EXTENSIONS) != 0 && 1593 (certflags_flags & CERTOPT_PTY) != 0) 1594 add_flag_option(c, "permit-pty"); 1595 if ((which & OPTIONS_EXTENSIONS) != 0 && 1596 (certflags_flags & CERTOPT_USER_RC) != 0) 1597 add_flag_option(c, "permit-user-rc"); 1598 if ((which & OPTIONS_CRITICAL) != 0 && 1599 certflags_src_addr != NULL) 1600 add_string_option(c, "source-address", certflags_src_addr); 1601 for (i = 0; i < ncert_userext; i++) { 1602 if ((cert_userext[i].crit && (which & OPTIONS_EXTENSIONS)) || 1603 (!cert_userext[i].crit && (which & OPTIONS_CRITICAL))) 1604 continue; 1605 if (cert_userext[i].val == NULL) 1606 add_flag_option(c, cert_userext[i].key); 1607 else { 1608 add_string_option(c, cert_userext[i].key, 1609 cert_userext[i].val); 1610 } 1611 } 1612 } 1613 1614 static struct sshkey * 1615 load_pkcs11_key(char *path) 1616 { 1617 #ifdef ENABLE_PKCS11 1618 struct sshkey **keys = NULL, *public, *private = NULL; 1619 int r, i, nkeys; 1620 1621 if ((r = sshkey_load_public(path, &public, NULL)) != 0) 1622 fatal("Couldn't load CA public key \"%s\": %s", 1623 path, ssh_err(r)); 1624 1625 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1626 debug3("%s: %d keys", __func__, nkeys); 1627 if (nkeys <= 0) 1628 fatal("cannot read public key from pkcs11"); 1629 for (i = 0; i < nkeys; i++) { 1630 if (sshkey_equal_public(public, keys[i])) { 1631 private = keys[i]; 1632 continue; 1633 } 1634 sshkey_free(keys[i]); 1635 } 1636 free(keys); 1637 sshkey_free(public); 1638 return private; 1639 #else 1640 fatal("no pkcs11 support"); 1641 #endif /* ENABLE_PKCS11 */ 1642 } 1643 1644 /* Signer for sshkey_certify_custom that uses the agent */ 1645 static int 1646 agent_signer(const struct sshkey *key, u_char **sigp, size_t *lenp, 1647 const u_char *data, size_t datalen, 1648 const char *alg, u_int compat, void *ctx) 1649 { 1650 int *agent_fdp = (int *)ctx; 1651 1652 return ssh_agent_sign(*agent_fdp, key, sigp, lenp, 1653 data, datalen, alg, compat); 1654 } 1655 1656 static void 1657 do_ca_sign(struct passwd *pw, const char *ca_key_path, int prefer_agent, 1658 unsigned long long cert_serial, int cert_serial_autoinc, 1659 int argc, char **argv) 1660 { 1661 int r, i, fd, found, agent_fd = -1; 1662 u_int n; 1663 struct sshkey *ca, *public; 1664 char valid[64], *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1665 FILE *f; 1666 struct ssh_identitylist *agent_ids; 1667 size_t j; 1668 1669 #ifdef ENABLE_PKCS11 1670 pkcs11_init(1); 1671 #endif 1672 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1673 if (pkcs11provider != NULL) { 1674 /* If a PKCS#11 token was specified then try to use it */ 1675 if ((ca = load_pkcs11_key(tmp)) == NULL) 1676 fatal("No PKCS#11 key matching %s found", ca_key_path); 1677 } else if (prefer_agent) { 1678 /* 1679 * Agent signature requested. Try to use agent after making 1680 * sure the public key specified is actually present in the 1681 * agent. 1682 */ 1683 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 1684 fatal("Cannot load CA public key %s: %s", 1685 tmp, ssh_err(r)); 1686 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 1687 fatal("Cannot use public key for CA signature: %s", 1688 ssh_err(r)); 1689 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0) 1690 fatal("Retrieve agent key list: %s", ssh_err(r)); 1691 found = 0; 1692 for (j = 0; j < agent_ids->nkeys; j++) { 1693 if (sshkey_equal(ca, agent_ids->keys[j])) { 1694 found = 1; 1695 break; 1696 } 1697 } 1698 if (!found) 1699 fatal("CA key %s not found in agent", tmp); 1700 ssh_free_identitylist(agent_ids); 1701 ca->flags |= SSHKEY_FLAG_EXT; 1702 } else { 1703 /* CA key is assumed to be a private key on the filesystem */ 1704 ca = load_identity(tmp); 1705 } 1706 free(tmp); 1707 1708 if (key_type_name != NULL && 1709 sshkey_type_from_name(key_type_name) != ca->type) { 1710 fatal("CA key type %s doesn't match specified %s", 1711 sshkey_ssh_name(ca), key_type_name); 1712 } 1713 1714 for (i = 0; i < argc; i++) { 1715 /* Split list of principals */ 1716 n = 0; 1717 if (cert_principals != NULL) { 1718 otmp = tmp = xstrdup(cert_principals); 1719 plist = NULL; 1720 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1721 plist = xreallocarray(plist, n + 1, sizeof(*plist)); 1722 if (*(plist[n] = xstrdup(cp)) == '\0') 1723 fatal("Empty principal name"); 1724 } 1725 free(otmp); 1726 } 1727 if (n > SSHKEY_CERT_MAX_PRINCIPALS) 1728 fatal("Too many certificate principals specified"); 1729 1730 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1731 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0) 1732 fatal("%s: unable to open \"%s\": %s", 1733 __func__, tmp, ssh_err(r)); 1734 if (public->type != KEY_RSA && public->type != KEY_DSA && 1735 public->type != KEY_ECDSA && public->type != KEY_ED25519 && 1736 public->type != KEY_XMSS) 1737 fatal("%s: key \"%s\" type %s cannot be certified", 1738 __func__, tmp, sshkey_type(public)); 1739 1740 /* Prepare certificate to sign */ 1741 if ((r = sshkey_to_certified(public)) != 0) 1742 fatal("Could not upgrade key %s to certificate: %s", 1743 tmp, ssh_err(r)); 1744 public->cert->type = cert_key_type; 1745 public->cert->serial = (u_int64_t)cert_serial; 1746 public->cert->key_id = xstrdup(cert_key_id); 1747 public->cert->nprincipals = n; 1748 public->cert->principals = plist; 1749 public->cert->valid_after = cert_valid_from; 1750 public->cert->valid_before = cert_valid_to; 1751 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL); 1752 prepare_options_buf(public->cert->extensions, 1753 OPTIONS_EXTENSIONS); 1754 if ((r = sshkey_from_private(ca, 1755 &public->cert->signature_key)) != 0) 1756 fatal("sshkey_from_private (ca key): %s", ssh_err(r)); 1757 1758 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) { 1759 if ((r = sshkey_certify_custom(public, ca, 1760 key_type_name, agent_signer, &agent_fd)) != 0) 1761 fatal("Couldn't certify key %s via agent: %s", 1762 tmp, ssh_err(r)); 1763 } else { 1764 if ((sshkey_certify(public, ca, key_type_name)) != 0) 1765 fatal("Couldn't certify key %s: %s", 1766 tmp, ssh_err(r)); 1767 } 1768 1769 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1770 *cp = '\0'; 1771 xasprintf(&out, "%s-cert.pub", tmp); 1772 free(tmp); 1773 1774 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1775 fatal("Could not open \"%s\" for writing: %s", out, 1776 strerror(errno)); 1777 if ((f = fdopen(fd, "w")) == NULL) 1778 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1779 if ((r = sshkey_write(public, f)) != 0) 1780 fatal("Could not write certified key to %s: %s", 1781 out, ssh_err(r)); 1782 fprintf(f, " %s\n", comment); 1783 fclose(f); 1784 1785 if (!quiet) { 1786 sshkey_format_cert_validity(public->cert, 1787 valid, sizeof(valid)); 1788 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1789 "valid %s", sshkey_cert_type(public), 1790 out, public->cert->key_id, 1791 (unsigned long long)public->cert->serial, 1792 cert_principals != NULL ? " for " : "", 1793 cert_principals != NULL ? cert_principals : "", 1794 valid); 1795 } 1796 1797 sshkey_free(public); 1798 free(out); 1799 if (cert_serial_autoinc) 1800 cert_serial++; 1801 } 1802 #ifdef ENABLE_PKCS11 1803 pkcs11_terminate(); 1804 #endif 1805 exit(0); 1806 } 1807 1808 static u_int64_t 1809 parse_relative_time(const char *s, time_t now) 1810 { 1811 int64_t mul, secs; 1812 1813 mul = *s == '-' ? -1 : 1; 1814 1815 if ((secs = convtime(s + 1)) == -1) 1816 fatal("Invalid relative certificate time %s", s); 1817 if (mul == -1 && secs > now) 1818 fatal("Certificate time %s cannot be represented", s); 1819 return now + (u_int64_t)(secs * mul); 1820 } 1821 1822 static void 1823 parse_cert_times(char *timespec) 1824 { 1825 char *from, *to; 1826 time_t now = time(NULL); 1827 int64_t secs; 1828 1829 /* +timespec relative to now */ 1830 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1831 if ((secs = convtime(timespec + 1)) == -1) 1832 fatal("Invalid relative certificate life %s", timespec); 1833 cert_valid_to = now + secs; 1834 /* 1835 * Backdate certificate one minute to avoid problems on hosts 1836 * with poorly-synchronised clocks. 1837 */ 1838 cert_valid_from = ((now - 59)/ 60) * 60; 1839 return; 1840 } 1841 1842 /* 1843 * from:to, where 1844 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "always" 1845 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "forever" 1846 */ 1847 from = xstrdup(timespec); 1848 to = strchr(from, ':'); 1849 if (to == NULL || from == to || *(to + 1) == '\0') 1850 fatal("Invalid certificate life specification %s", timespec); 1851 *to++ = '\0'; 1852 1853 if (*from == '-' || *from == '+') 1854 cert_valid_from = parse_relative_time(from, now); 1855 else if (strcmp(from, "always") == 0) 1856 cert_valid_from = 0; 1857 else if (parse_absolute_time(from, &cert_valid_from) != 0) 1858 fatal("Invalid from time \"%s\"", from); 1859 1860 if (*to == '-' || *to == '+') 1861 cert_valid_to = parse_relative_time(to, now); 1862 else if (strcmp(to, "forever") == 0) 1863 cert_valid_to = ~(u_int64_t)0; 1864 else if (parse_absolute_time(to, &cert_valid_to) != 0) 1865 fatal("Invalid to time \"%s\"", to); 1866 1867 if (cert_valid_to <= cert_valid_from) 1868 fatal("Empty certificate validity interval"); 1869 free(from); 1870 } 1871 1872 static void 1873 add_cert_option(char *opt) 1874 { 1875 char *val, *cp; 1876 int iscrit = 0; 1877 1878 if (strcasecmp(opt, "clear") == 0) 1879 certflags_flags = 0; 1880 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1881 certflags_flags &= ~CERTOPT_X_FWD; 1882 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1883 certflags_flags |= CERTOPT_X_FWD; 1884 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1885 certflags_flags &= ~CERTOPT_AGENT_FWD; 1886 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1887 certflags_flags |= CERTOPT_AGENT_FWD; 1888 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1889 certflags_flags &= ~CERTOPT_PORT_FWD; 1890 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1891 certflags_flags |= CERTOPT_PORT_FWD; 1892 else if (strcasecmp(opt, "no-pty") == 0) 1893 certflags_flags &= ~CERTOPT_PTY; 1894 else if (strcasecmp(opt, "permit-pty") == 0) 1895 certflags_flags |= CERTOPT_PTY; 1896 else if (strcasecmp(opt, "no-user-rc") == 0) 1897 certflags_flags &= ~CERTOPT_USER_RC; 1898 else if (strcasecmp(opt, "permit-user-rc") == 0) 1899 certflags_flags |= CERTOPT_USER_RC; 1900 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1901 val = opt + 14; 1902 if (*val == '\0') 1903 fatal("Empty force-command option"); 1904 if (certflags_command != NULL) 1905 fatal("force-command already specified"); 1906 certflags_command = xstrdup(val); 1907 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1908 val = opt + 15; 1909 if (*val == '\0') 1910 fatal("Empty source-address option"); 1911 if (certflags_src_addr != NULL) 1912 fatal("source-address already specified"); 1913 if (addr_match_cidr_list(NULL, val) != 0) 1914 fatal("Invalid source-address list"); 1915 certflags_src_addr = xstrdup(val); 1916 } else if (strncasecmp(opt, "extension:", 10) == 0 || 1917 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) { 1918 val = xstrdup(strchr(opt, ':') + 1); 1919 if ((cp = strchr(val, '=')) != NULL) 1920 *cp++ = '\0'; 1921 cert_userext = xreallocarray(cert_userext, ncert_userext + 1, 1922 sizeof(*cert_userext)); 1923 cert_userext[ncert_userext].key = val; 1924 cert_userext[ncert_userext].val = cp == NULL ? 1925 NULL : xstrdup(cp); 1926 cert_userext[ncert_userext].crit = iscrit; 1927 ncert_userext++; 1928 } else 1929 fatal("Unsupported certificate option \"%s\"", opt); 1930 } 1931 1932 static void 1933 show_options(struct sshbuf *optbuf, int in_critical) 1934 { 1935 char *name, *arg; 1936 struct sshbuf *options, *option = NULL; 1937 int r; 1938 1939 if ((options = sshbuf_fromb(optbuf)) == NULL) 1940 fatal("%s: sshbuf_fromb failed", __func__); 1941 while (sshbuf_len(options) != 0) { 1942 sshbuf_free(option); 1943 option = NULL; 1944 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 || 1945 (r = sshbuf_froms(options, &option)) != 0) 1946 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1947 printf(" %s", name); 1948 if (!in_critical && 1949 (strcmp(name, "permit-X11-forwarding") == 0 || 1950 strcmp(name, "permit-agent-forwarding") == 0 || 1951 strcmp(name, "permit-port-forwarding") == 0 || 1952 strcmp(name, "permit-pty") == 0 || 1953 strcmp(name, "permit-user-rc") == 0)) 1954 printf("\n"); 1955 else if (in_critical && 1956 (strcmp(name, "force-command") == 0 || 1957 strcmp(name, "source-address") == 0)) { 1958 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0) 1959 fatal("%s: buffer error: %s", 1960 __func__, ssh_err(r)); 1961 printf(" %s\n", arg); 1962 free(arg); 1963 } else { 1964 printf(" UNKNOWN OPTION (len %zu)\n", 1965 sshbuf_len(option)); 1966 sshbuf_reset(option); 1967 } 1968 free(name); 1969 if (sshbuf_len(option) != 0) 1970 fatal("Option corrupt: extra data at end"); 1971 } 1972 sshbuf_free(option); 1973 sshbuf_free(options); 1974 } 1975 1976 static void 1977 print_cert(struct sshkey *key) 1978 { 1979 char valid[64], *key_fp, *ca_fp; 1980 u_int i; 1981 1982 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT); 1983 ca_fp = sshkey_fingerprint(key->cert->signature_key, 1984 fingerprint_hash, SSH_FP_DEFAULT); 1985 if (key_fp == NULL || ca_fp == NULL) 1986 fatal("%s: sshkey_fingerprint fail", __func__); 1987 sshkey_format_cert_validity(key->cert, valid, sizeof(valid)); 1988 1989 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key), 1990 sshkey_cert_type(key)); 1991 printf(" Public key: %s %s\n", sshkey_type(key), key_fp); 1992 printf(" Signing CA: %s %s (using %s)\n", 1993 sshkey_type(key->cert->signature_key), ca_fp, 1994 key->cert->signature_type); 1995 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1996 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial); 1997 printf(" Valid: %s\n", valid); 1998 printf(" Principals: "); 1999 if (key->cert->nprincipals == 0) 2000 printf("(none)\n"); 2001 else { 2002 for (i = 0; i < key->cert->nprincipals; i++) 2003 printf("\n %s", 2004 key->cert->principals[i]); 2005 printf("\n"); 2006 } 2007 printf(" Critical Options: "); 2008 if (sshbuf_len(key->cert->critical) == 0) 2009 printf("(none)\n"); 2010 else { 2011 printf("\n"); 2012 show_options(key->cert->critical, 1); 2013 } 2014 printf(" Extensions: "); 2015 if (sshbuf_len(key->cert->extensions) == 0) 2016 printf("(none)\n"); 2017 else { 2018 printf("\n"); 2019 show_options(key->cert->extensions, 0); 2020 } 2021 } 2022 2023 static void 2024 do_show_cert(struct passwd *pw) 2025 { 2026 struct sshkey *key = NULL; 2027 struct stat st; 2028 int r, is_stdin = 0, ok = 0; 2029 FILE *f; 2030 char *cp, *line = NULL; 2031 const char *path; 2032 size_t linesize = 0; 2033 u_long lnum = 0; 2034 2035 if (!have_identity) 2036 ask_filename(pw, "Enter file in which the key is"); 2037 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) < 0) 2038 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 2039 2040 path = identity_file; 2041 if (strcmp(path, "-") == 0) { 2042 f = stdin; 2043 path = "(stdin)"; 2044 is_stdin = 1; 2045 } else if ((f = fopen(identity_file, "r")) == NULL) 2046 fatal("fopen %s: %s", identity_file, strerror(errno)); 2047 2048 while (getline(&line, &linesize, f) != -1) { 2049 lnum++; 2050 sshkey_free(key); 2051 key = NULL; 2052 /* Trim leading space and comments */ 2053 cp = line + strspn(line, " \t"); 2054 if (*cp == '#' || *cp == '\0') 2055 continue; 2056 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2057 fatal("sshkey_new"); 2058 if ((r = sshkey_read(key, &cp)) != 0) { 2059 error("%s:%lu: invalid key: %s", path, 2060 lnum, ssh_err(r)); 2061 continue; 2062 } 2063 if (!sshkey_is_cert(key)) { 2064 error("%s:%lu is not a certificate", path, lnum); 2065 continue; 2066 } 2067 ok = 1; 2068 if (!is_stdin && lnum == 1) 2069 printf("%s:\n", path); 2070 else 2071 printf("%s:%lu:\n", path, lnum); 2072 print_cert(key); 2073 } 2074 free(line); 2075 sshkey_free(key); 2076 fclose(f); 2077 exit(ok ? 0 : 1); 2078 } 2079 2080 static void 2081 load_krl(const char *path, struct ssh_krl **krlp) 2082 { 2083 struct sshbuf *krlbuf; 2084 int r, fd; 2085 2086 if ((krlbuf = sshbuf_new()) == NULL) 2087 fatal("sshbuf_new failed"); 2088 if ((fd = open(path, O_RDONLY)) == -1) 2089 fatal("open %s: %s", path, strerror(errno)); 2090 if ((r = sshkey_load_file(fd, krlbuf)) != 0) 2091 fatal("Unable to load KRL: %s", ssh_err(r)); 2092 close(fd); 2093 /* XXX check sigs */ 2094 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 || 2095 *krlp == NULL) 2096 fatal("Invalid KRL file: %s", ssh_err(r)); 2097 sshbuf_free(krlbuf); 2098 } 2099 2100 static void 2101 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp, 2102 const char *file, u_long lnum) 2103 { 2104 char *tmp; 2105 size_t tlen; 2106 struct sshbuf *b; 2107 int r; 2108 2109 if (strncmp(cp, "SHA256:", 7) != 0) 2110 fatal("%s:%lu: unsupported hash algorithm", file, lnum); 2111 cp += 7; 2112 2113 /* 2114 * OpenSSH base64 hashes omit trailing '=' 2115 * characters; put them back for decode. 2116 */ 2117 tlen = strlen(cp); 2118 tmp = xmalloc(tlen + 4 + 1); 2119 strlcpy(tmp, cp, tlen + 1); 2120 while ((tlen % 4) != 0) { 2121 tmp[tlen++] = '='; 2122 tmp[tlen] = '\0'; 2123 } 2124 if ((b = sshbuf_new()) == NULL) 2125 fatal("%s: sshbuf_new failed", __func__); 2126 if ((r = sshbuf_b64tod(b, tmp)) != 0) 2127 fatal("%s:%lu: decode hash failed: %s", file, lnum, ssh_err(r)); 2128 free(tmp); 2129 *lenp = sshbuf_len(b); 2130 *blobp = xmalloc(*lenp); 2131 memcpy(*blobp, sshbuf_ptr(b), *lenp); 2132 sshbuf_free(b); 2133 } 2134 2135 static void 2136 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca, 2137 const struct sshkey *ca, struct ssh_krl *krl) 2138 { 2139 struct sshkey *key = NULL; 2140 u_long lnum = 0; 2141 char *path, *cp, *ep, *line = NULL; 2142 u_char *blob = NULL; 2143 size_t blen = 0, linesize = 0; 2144 unsigned long long serial, serial2; 2145 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r; 2146 FILE *krl_spec; 2147 2148 path = tilde_expand_filename(file, pw->pw_uid); 2149 if (strcmp(path, "-") == 0) { 2150 krl_spec = stdin; 2151 free(path); 2152 path = xstrdup("(standard input)"); 2153 } else if ((krl_spec = fopen(path, "r")) == NULL) 2154 fatal("fopen %s: %s", path, strerror(errno)); 2155 2156 if (!quiet) 2157 printf("Revoking from %s\n", path); 2158 while (getline(&line, &linesize, krl_spec) != -1) { 2159 lnum++; 2160 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0; 2161 cp = line + strspn(line, " \t"); 2162 /* Trim trailing space, comments and strip \n */ 2163 for (i = 0, r = -1; cp[i] != '\0'; i++) { 2164 if (cp[i] == '#' || cp[i] == '\n') { 2165 cp[i] = '\0'; 2166 break; 2167 } 2168 if (cp[i] == ' ' || cp[i] == '\t') { 2169 /* Remember the start of a span of whitespace */ 2170 if (r == -1) 2171 r = i; 2172 } else 2173 r = -1; 2174 } 2175 if (r != -1) 2176 cp[r] = '\0'; 2177 if (*cp == '\0') 2178 continue; 2179 if (strncasecmp(cp, "serial:", 7) == 0) { 2180 if (ca == NULL && !wild_ca) { 2181 fatal("revoking certificates by serial number " 2182 "requires specification of a CA key"); 2183 } 2184 cp += 7; 2185 cp = cp + strspn(cp, " \t"); 2186 errno = 0; 2187 serial = strtoull(cp, &ep, 0); 2188 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 2189 fatal("%s:%lu: invalid serial \"%s\"", 2190 path, lnum, cp); 2191 if (errno == ERANGE && serial == ULLONG_MAX) 2192 fatal("%s:%lu: serial out of range", 2193 path, lnum); 2194 serial2 = serial; 2195 if (*ep == '-') { 2196 cp = ep + 1; 2197 errno = 0; 2198 serial2 = strtoull(cp, &ep, 0); 2199 if (*cp == '\0' || *ep != '\0') 2200 fatal("%s:%lu: invalid serial \"%s\"", 2201 path, lnum, cp); 2202 if (errno == ERANGE && serial2 == ULLONG_MAX) 2203 fatal("%s:%lu: serial out of range", 2204 path, lnum); 2205 if (serial2 <= serial) 2206 fatal("%s:%lu: invalid serial range " 2207 "%llu:%llu", path, lnum, 2208 (unsigned long long)serial, 2209 (unsigned long long)serial2); 2210 } 2211 if (ssh_krl_revoke_cert_by_serial_range(krl, 2212 ca, serial, serial2) != 0) { 2213 fatal("%s: revoke serial failed", 2214 __func__); 2215 } 2216 } else if (strncasecmp(cp, "id:", 3) == 0) { 2217 if (ca == NULL && !wild_ca) { 2218 fatal("revoking certificates by key ID " 2219 "requires specification of a CA key"); 2220 } 2221 cp += 3; 2222 cp = cp + strspn(cp, " \t"); 2223 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2224 fatal("%s: revoke key ID failed", __func__); 2225 } else if (strncasecmp(cp, "hash:", 5) == 0) { 2226 cp += 5; 2227 cp = cp + strspn(cp, " \t"); 2228 hash_to_blob(cp, &blob, &blen, file, lnum); 2229 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2230 } else { 2231 if (strncasecmp(cp, "key:", 4) == 0) { 2232 cp += 4; 2233 cp = cp + strspn(cp, " \t"); 2234 was_explicit_key = 1; 2235 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2236 cp += 5; 2237 cp = cp + strspn(cp, " \t"); 2238 was_sha1 = 1; 2239 } else if (strncasecmp(cp, "sha256:", 7) == 0) { 2240 cp += 7; 2241 cp = cp + strspn(cp, " \t"); 2242 was_sha256 = 1; 2243 /* 2244 * Just try to process the line as a key. 2245 * Parsing will fail if it isn't. 2246 */ 2247 } 2248 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2249 fatal("sshkey_new"); 2250 if ((r = sshkey_read(key, &cp)) != 0) 2251 fatal("%s:%lu: invalid key: %s", 2252 path, lnum, ssh_err(r)); 2253 if (was_explicit_key) 2254 r = ssh_krl_revoke_key_explicit(krl, key); 2255 else if (was_sha1) { 2256 if (sshkey_fingerprint_raw(key, 2257 SSH_DIGEST_SHA1, &blob, &blen) != 0) { 2258 fatal("%s:%lu: fingerprint failed", 2259 file, lnum); 2260 } 2261 r = ssh_krl_revoke_key_sha1(krl, blob, blen); 2262 } else if (was_sha256) { 2263 if (sshkey_fingerprint_raw(key, 2264 SSH_DIGEST_SHA256, &blob, &blen) != 0) { 2265 fatal("%s:%lu: fingerprint failed", 2266 file, lnum); 2267 } 2268 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2269 } else 2270 r = ssh_krl_revoke_key(krl, key); 2271 if (r != 0) 2272 fatal("%s: revoke key failed: %s", 2273 __func__, ssh_err(r)); 2274 freezero(blob, blen); 2275 blob = NULL; 2276 blen = 0; 2277 sshkey_free(key); 2278 } 2279 } 2280 if (strcmp(path, "-") != 0) 2281 fclose(krl_spec); 2282 free(line); 2283 free(path); 2284 } 2285 2286 static void 2287 do_gen_krl(struct passwd *pw, int updating, const char *ca_key_path, 2288 unsigned long long krl_version, const char *krl_comment, 2289 int argc, char **argv) 2290 { 2291 struct ssh_krl *krl; 2292 struct stat sb; 2293 struct sshkey *ca = NULL; 2294 int fd, i, r, wild_ca = 0; 2295 char *tmp; 2296 struct sshbuf *kbuf; 2297 2298 if (*identity_file == '\0') 2299 fatal("KRL generation requires an output file"); 2300 if (stat(identity_file, &sb) == -1) { 2301 if (errno != ENOENT) 2302 fatal("Cannot access KRL \"%s\": %s", 2303 identity_file, strerror(errno)); 2304 if (updating) 2305 fatal("KRL \"%s\" does not exist", identity_file); 2306 } 2307 if (ca_key_path != NULL) { 2308 if (strcasecmp(ca_key_path, "none") == 0) 2309 wild_ca = 1; 2310 else { 2311 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2312 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 2313 fatal("Cannot load CA public key %s: %s", 2314 tmp, ssh_err(r)); 2315 free(tmp); 2316 } 2317 } 2318 2319 if (updating) 2320 load_krl(identity_file, &krl); 2321 else if ((krl = ssh_krl_init()) == NULL) 2322 fatal("couldn't create KRL"); 2323 2324 if (krl_version != 0) 2325 ssh_krl_set_version(krl, krl_version); 2326 if (krl_comment != NULL) 2327 ssh_krl_set_comment(krl, krl_comment); 2328 2329 for (i = 0; i < argc; i++) 2330 update_krl_from_file(pw, argv[i], wild_ca, ca, krl); 2331 2332 if ((kbuf = sshbuf_new()) == NULL) 2333 fatal("sshbuf_new failed"); 2334 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0) 2335 fatal("Couldn't generate KRL"); 2336 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2337 fatal("open %s: %s", identity_file, strerror(errno)); 2338 if (atomicio(vwrite, fd, sshbuf_mutable_ptr(kbuf), sshbuf_len(kbuf)) != 2339 sshbuf_len(kbuf)) 2340 fatal("write %s: %s", identity_file, strerror(errno)); 2341 close(fd); 2342 sshbuf_free(kbuf); 2343 ssh_krl_free(krl); 2344 sshkey_free(ca); 2345 } 2346 2347 static void 2348 do_check_krl(struct passwd *pw, int argc, char **argv) 2349 { 2350 int i, r, ret = 0; 2351 char *comment; 2352 struct ssh_krl *krl; 2353 struct sshkey *k; 2354 2355 if (*identity_file == '\0') 2356 fatal("KRL checking requires an input file"); 2357 load_krl(identity_file, &krl); 2358 for (i = 0; i < argc; i++) { 2359 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0) 2360 fatal("Cannot load public key %s: %s", 2361 argv[i], ssh_err(r)); 2362 r = ssh_krl_check_key(krl, k); 2363 printf("%s%s%s%s: %s\n", argv[i], 2364 *comment ? " (" : "", comment, *comment ? ")" : "", 2365 r == 0 ? "ok" : "REVOKED"); 2366 if (r != 0) 2367 ret = 1; 2368 sshkey_free(k); 2369 free(comment); 2370 } 2371 ssh_krl_free(krl); 2372 exit(ret); 2373 } 2374 2375 static void 2376 usage(void) 2377 { 2378 fprintf(stderr, 2379 "usage: ssh-keygen [-q] [-b bits] [-t dsa | ecdsa | ed25519 | rsa] [-m format]\n" 2380 " [-N new_passphrase] [-C comment] [-f output_keyfile]\n" 2381 " ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-m format]\n" 2382 " [-f keyfile]\n" 2383 " ssh-keygen -i [-m key_format] [-f input_keyfile]\n" 2384 " ssh-keygen -e [-m key_format] [-f input_keyfile]\n" 2385 " ssh-keygen -y [-f input_keyfile]\n" 2386 " ssh-keygen -c [-P passphrase] [-C comment] [-f keyfile]\n" 2387 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n" 2388 " ssh-keygen -B [-f input_keyfile]\n"); 2389 #ifdef ENABLE_PKCS11 2390 fprintf(stderr, 2391 " ssh-keygen -D pkcs11\n"); 2392 #endif 2393 fprintf(stderr, 2394 " ssh-keygen -F hostname [-f known_hosts_file] [-l]\n" 2395 " ssh-keygen -H [-f known_hosts_file]\n" 2396 " ssh-keygen -R hostname [-f known_hosts_file]\n" 2397 " ssh-keygen -r hostname [-f input_keyfile] [-g]\n" 2398 #ifdef WITH_OPENSSL 2399 " ssh-keygen -G output_file [-v] [-b bits] [-M memory] [-S start_point]\n" 2400 " ssh-keygen -T output_file -f input_file [-v] [-a rounds] [-J num_lines]\n" 2401 " [-j start_line] [-K checkpt] [-W generator]\n" 2402 #endif 2403 " ssh-keygen -s ca_key -I certificate_identity [-h] [-U]\n" 2404 " [-D pkcs11_provider] [-n principals] [-O option]\n" 2405 " [-V validity_interval] [-z serial_number] file ...\n" 2406 " ssh-keygen -L [-f input_keyfile]\n" 2407 " ssh-keygen -A\n" 2408 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n" 2409 " file ...\n" 2410 " ssh-keygen -Q -f krl_file file ...\n"); 2411 exit(1); 2412 } 2413 2414 /* 2415 * Main program for key management. 2416 */ 2417 int 2418 main(int argc, char **argv) 2419 { 2420 char dotsshdir[PATH_MAX], comment[1024], *passphrase1, *passphrase2; 2421 char *rr_hostname = NULL, *ep, *fp, *ra; 2422 struct sshkey *private, *public; 2423 struct passwd *pw; 2424 struct stat st; 2425 int r, opt, type, fd; 2426 int change_passphrase = 0, change_comment = 0, show_cert = 0; 2427 int find_host = 0, delete_host = 0, hash_hosts = 0; 2428 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 2429 int prefer_agent = 0, convert_to = 0, convert_from = 0; 2430 int print_public = 0, print_generic = 0, cert_serial_autoinc = 0; 2431 unsigned long long cert_serial = 0; 2432 char *identity_comment = NULL, *ca_key_path = NULL; 2433 u_int bits = 0; 2434 FILE *f; 2435 const char *errstr; 2436 int log_level = SYSLOG_LEVEL_INFO; 2437 #ifdef WITH_OPENSSL 2438 /* Moduli generation/screening */ 2439 char out_file[PATH_MAX], *checkpoint = NULL; 2440 u_int32_t memory = 0, generator_wanted = 0; 2441 int do_gen_candidates = 0, do_screen_candidates = 0; 2442 unsigned long start_lineno = 0, lines_to_process = 0; 2443 BIGNUM *start = NULL; 2444 #endif 2445 2446 extern int optind; 2447 extern char *optarg; 2448 2449 ssh_malloc_init(); /* must be called before any mallocs */ 2450 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 2451 sanitise_stdfd(); 2452 2453 __progname = ssh_get_progname(argv[0]); 2454 2455 seed_rng(); 2456 2457 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 2458 2459 msetlocale(); 2460 2461 /* we need this for the home * directory. */ 2462 pw = getpwuid(getuid()); 2463 if (!pw) 2464 fatal("No user exists for uid %lu", (u_long)getuid()); 2465 if (gethostname(hostname, sizeof(hostname)) < 0) 2466 fatal("gethostname: %s", strerror(errno)); 2467 2468 /* Remaining characters: Ydw */ 2469 while ((opt = getopt(argc, argv, "ABHLQUXceghiklopquvxy" 2470 "C:D:E:F:G:I:J:K:M:N:O:P:R:S:T:V:W:Z:" 2471 "a:b:f:g:j:m:n:r:s:t:z:")) != -1) { 2472 switch (opt) { 2473 case 'A': 2474 gen_all_hostkeys = 1; 2475 break; 2476 case 'b': 2477 bits = (u_int32_t)strtonum(optarg, 10, 32768, &errstr); 2478 if (errstr) 2479 fatal("Bits has bad value %s (%s)", 2480 optarg, errstr); 2481 break; 2482 case 'E': 2483 fingerprint_hash = ssh_digest_alg_by_name(optarg); 2484 if (fingerprint_hash == -1) 2485 fatal("Invalid hash algorithm \"%s\"", optarg); 2486 break; 2487 case 'F': 2488 find_host = 1; 2489 rr_hostname = optarg; 2490 break; 2491 case 'H': 2492 hash_hosts = 1; 2493 break; 2494 case 'I': 2495 cert_key_id = optarg; 2496 break; 2497 case 'R': 2498 delete_host = 1; 2499 rr_hostname = optarg; 2500 break; 2501 case 'L': 2502 show_cert = 1; 2503 break; 2504 case 'l': 2505 print_fingerprint = 1; 2506 break; 2507 case 'B': 2508 print_bubblebabble = 1; 2509 break; 2510 case 'm': 2511 if (strcasecmp(optarg, "RFC4716") == 0 || 2512 strcasecmp(optarg, "ssh2") == 0) { 2513 convert_format = FMT_RFC4716; 2514 break; 2515 } 2516 if (strcasecmp(optarg, "PKCS8") == 0) { 2517 convert_format = FMT_PKCS8; 2518 break; 2519 } 2520 if (strcasecmp(optarg, "PEM") == 0) { 2521 convert_format = FMT_PEM; 2522 use_new_format = 0; 2523 break; 2524 } 2525 fatal("Unsupported conversion format \"%s\"", optarg); 2526 case 'n': 2527 cert_principals = optarg; 2528 break; 2529 case 'o': 2530 /* no-op; new format is already the default */ 2531 break; 2532 case 'p': 2533 change_passphrase = 1; 2534 break; 2535 case 'c': 2536 change_comment = 1; 2537 break; 2538 case 'f': 2539 if (strlcpy(identity_file, optarg, 2540 sizeof(identity_file)) >= sizeof(identity_file)) 2541 fatal("Identity filename too long"); 2542 have_identity = 1; 2543 break; 2544 case 'g': 2545 print_generic = 1; 2546 break; 2547 case 'P': 2548 identity_passphrase = optarg; 2549 break; 2550 case 'N': 2551 identity_new_passphrase = optarg; 2552 break; 2553 case 'Q': 2554 check_krl = 1; 2555 break; 2556 case 'O': 2557 add_cert_option(optarg); 2558 break; 2559 case 'Z': 2560 new_format_cipher = optarg; 2561 break; 2562 case 'C': 2563 identity_comment = optarg; 2564 break; 2565 case 'q': 2566 quiet = 1; 2567 break; 2568 case 'e': 2569 case 'x': 2570 /* export key */ 2571 convert_to = 1; 2572 break; 2573 case 'h': 2574 cert_key_type = SSH2_CERT_TYPE_HOST; 2575 certflags_flags = 0; 2576 break; 2577 case 'k': 2578 gen_krl = 1; 2579 break; 2580 case 'i': 2581 case 'X': 2582 /* import key */ 2583 convert_from = 1; 2584 break; 2585 case 'y': 2586 print_public = 1; 2587 break; 2588 case 's': 2589 ca_key_path = optarg; 2590 break; 2591 case 't': 2592 key_type_name = optarg; 2593 break; 2594 case 'D': 2595 pkcs11provider = optarg; 2596 break; 2597 case 'U': 2598 prefer_agent = 1; 2599 break; 2600 case 'u': 2601 update_krl = 1; 2602 break; 2603 case 'v': 2604 if (log_level == SYSLOG_LEVEL_INFO) 2605 log_level = SYSLOG_LEVEL_DEBUG1; 2606 else { 2607 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2608 log_level < SYSLOG_LEVEL_DEBUG3) 2609 log_level++; 2610 } 2611 break; 2612 case 'r': 2613 rr_hostname = optarg; 2614 break; 2615 case 'a': 2616 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr); 2617 if (errstr) 2618 fatal("Invalid number: %s (%s)", 2619 optarg, errstr); 2620 break; 2621 case 'V': 2622 parse_cert_times(optarg); 2623 break; 2624 case 'z': 2625 errno = 0; 2626 if (*optarg == '+') { 2627 cert_serial_autoinc = 1; 2628 optarg++; 2629 } 2630 cert_serial = strtoull(optarg, &ep, 10); 2631 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 2632 (errno == ERANGE && cert_serial == ULLONG_MAX)) 2633 fatal("Invalid serial number \"%s\"", optarg); 2634 break; 2635 #ifdef WITH_OPENSSL 2636 /* Moduli generation/screening */ 2637 case 'G': 2638 do_gen_candidates = 1; 2639 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2640 sizeof(out_file)) 2641 fatal("Output filename too long"); 2642 break; 2643 case 'J': 2644 lines_to_process = strtoul(optarg, NULL, 10); 2645 break; 2646 case 'j': 2647 start_lineno = strtoul(optarg, NULL, 10); 2648 break; 2649 case 'K': 2650 if (strlen(optarg) >= PATH_MAX) 2651 fatal("Checkpoint filename too long"); 2652 checkpoint = xstrdup(optarg); 2653 break; 2654 case 'M': 2655 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, 2656 &errstr); 2657 if (errstr) 2658 fatal("Memory limit is %s: %s", errstr, optarg); 2659 break; 2660 case 'S': 2661 /* XXX - also compare length against bits */ 2662 if (BN_hex2bn(&start, optarg) == 0) 2663 fatal("Invalid start point."); 2664 break; 2665 case 'T': 2666 do_screen_candidates = 1; 2667 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2668 sizeof(out_file)) 2669 fatal("Output filename too long"); 2670 break; 2671 case 'W': 2672 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2673 UINT_MAX, &errstr); 2674 if (errstr != NULL) 2675 fatal("Desired generator invalid: %s (%s)", 2676 optarg, errstr); 2677 break; 2678 #endif /* WITH_OPENSSL */ 2679 case '?': 2680 default: 2681 usage(); 2682 } 2683 } 2684 2685 /* reinit */ 2686 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2687 2688 argv += optind; 2689 argc -= optind; 2690 2691 if (ca_key_path != NULL) { 2692 if (argc < 1 && !gen_krl) { 2693 error("Too few arguments."); 2694 usage(); 2695 } 2696 } else if (argc > 0 && !gen_krl && !check_krl) { 2697 error("Too many arguments."); 2698 usage(); 2699 } 2700 if (change_passphrase && change_comment) { 2701 error("Can only have one of -p and -c."); 2702 usage(); 2703 } 2704 if (print_fingerprint && (delete_host || hash_hosts)) { 2705 error("Cannot use -l with -H or -R."); 2706 usage(); 2707 } 2708 if (gen_krl) { 2709 do_gen_krl(pw, update_krl, ca_key_path, 2710 cert_serial, identity_comment, 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, ca_key_path, prefer_agent, 2721 cert_serial, cert_serial_autoinc, argc, argv); 2722 } 2723 if (show_cert) 2724 do_show_cert(pw); 2725 if (delete_host || hash_hosts || find_host) { 2726 do_known_hosts(pw, rr_hostname, find_host, 2727 delete_host, hash_hosts); 2728 } 2729 if (pkcs11provider != NULL) 2730 do_download(pw); 2731 if (print_fingerprint || print_bubblebabble) 2732 do_fingerprint(pw); 2733 if (change_passphrase) 2734 do_change_passphrase(pw); 2735 if (change_comment) 2736 do_change_comment(pw, identity_comment); 2737 #ifdef WITH_OPENSSL 2738 if (convert_to) 2739 do_convert_to(pw); 2740 if (convert_from) 2741 do_convert_from(pw); 2742 #endif 2743 if (print_public) 2744 do_print_public(pw); 2745 if (rr_hostname != NULL) { 2746 unsigned int n = 0; 2747 2748 if (have_identity) { 2749 n = do_print_resource_record(pw, identity_file, 2750 rr_hostname, print_generic); 2751 if (n == 0) 2752 fatal("%s: %s", identity_file, strerror(errno)); 2753 exit(0); 2754 } else { 2755 2756 n += do_print_resource_record(pw, 2757 _PATH_HOST_RSA_KEY_FILE, rr_hostname, 2758 print_generic); 2759 n += do_print_resource_record(pw, 2760 _PATH_HOST_DSA_KEY_FILE, rr_hostname, 2761 print_generic); 2762 n += do_print_resource_record(pw, 2763 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname, 2764 print_generic); 2765 n += do_print_resource_record(pw, 2766 _PATH_HOST_ED25519_KEY_FILE, rr_hostname, 2767 print_generic); 2768 n += do_print_resource_record(pw, 2769 _PATH_HOST_XMSS_KEY_FILE, rr_hostname, 2770 print_generic); 2771 if (n == 0) 2772 fatal("no keys found."); 2773 exit(0); 2774 } 2775 } 2776 2777 #ifdef WITH_OPENSSL 2778 if (do_gen_candidates) { 2779 FILE *out = fopen(out_file, "w"); 2780 2781 if (out == NULL) { 2782 error("Couldn't open modulus candidate file \"%s\": %s", 2783 out_file, strerror(errno)); 2784 return (1); 2785 } 2786 if (bits == 0) 2787 bits = DEFAULT_BITS; 2788 if (gen_candidates(out, memory, bits, start) != 0) 2789 fatal("modulus candidate generation failed"); 2790 2791 return (0); 2792 } 2793 2794 if (do_screen_candidates) { 2795 FILE *in; 2796 FILE *out = fopen(out_file, "a"); 2797 2798 if (have_identity && strcmp(identity_file, "-") != 0) { 2799 if ((in = fopen(identity_file, "r")) == NULL) { 2800 fatal("Couldn't open modulus candidate " 2801 "file \"%s\": %s", identity_file, 2802 strerror(errno)); 2803 } 2804 } else 2805 in = stdin; 2806 2807 if (out == NULL) { 2808 fatal("Couldn't open moduli file \"%s\": %s", 2809 out_file, strerror(errno)); 2810 } 2811 if (prime_test(in, out, rounds == 0 ? 100 : rounds, 2812 generator_wanted, checkpoint, 2813 start_lineno, lines_to_process) != 0) 2814 fatal("modulus screening failed"); 2815 return (0); 2816 } 2817 #endif 2818 2819 if (gen_all_hostkeys) { 2820 do_gen_all_hostkeys(pw); 2821 return (0); 2822 } 2823 2824 if (key_type_name == NULL) 2825 key_type_name = DEFAULT_KEY_TYPE_NAME; 2826 2827 type = sshkey_type_from_name(key_type_name); 2828 type_bits_valid(type, key_type_name, &bits); 2829 2830 if (!quiet) 2831 printf("Generating public/private %s key pair.\n", 2832 key_type_name); 2833 if ((r = sshkey_generate(type, bits, &private)) != 0) 2834 fatal("sshkey_generate failed"); 2835 if ((r = sshkey_from_private(private, &public)) != 0) 2836 fatal("sshkey_from_private failed: %s\n", ssh_err(r)); 2837 2838 if (!have_identity) 2839 ask_filename(pw, "Enter file in which to save the key"); 2840 2841 /* Create ~/.ssh directory if it doesn't already exist. */ 2842 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2843 pw->pw_dir, _PATH_SSH_USER_DIR); 2844 if (strstr(identity_file, dotsshdir) != NULL) { 2845 if (stat(dotsshdir, &st) < 0) { 2846 if (errno != ENOENT) { 2847 error("Could not stat %s: %s", dotsshdir, 2848 strerror(errno)); 2849 } else if (mkdir(dotsshdir, 0700) < 0) { 2850 error("Could not create directory '%s': %s", 2851 dotsshdir, strerror(errno)); 2852 } else if (!quiet) 2853 printf("Created directory '%s'.\n", dotsshdir); 2854 } 2855 } 2856 /* If the file already exists, ask the user to confirm. */ 2857 if (stat(identity_file, &st) >= 0) { 2858 char yesno[3]; 2859 printf("%s already exists.\n", identity_file); 2860 printf("Overwrite (y/n)? "); 2861 fflush(stdout); 2862 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2863 exit(1); 2864 if (yesno[0] != 'y' && yesno[0] != 'Y') 2865 exit(1); 2866 } 2867 /* Ask for a passphrase (twice). */ 2868 if (identity_passphrase) 2869 passphrase1 = xstrdup(identity_passphrase); 2870 else if (identity_new_passphrase) 2871 passphrase1 = xstrdup(identity_new_passphrase); 2872 else { 2873 passphrase_again: 2874 passphrase1 = 2875 read_passphrase("Enter passphrase (empty for no " 2876 "passphrase): ", RP_ALLOW_STDIN); 2877 passphrase2 = read_passphrase("Enter same passphrase again: ", 2878 RP_ALLOW_STDIN); 2879 if (strcmp(passphrase1, passphrase2) != 0) { 2880 /* 2881 * The passphrases do not match. Clear them and 2882 * retry. 2883 */ 2884 explicit_bzero(passphrase1, strlen(passphrase1)); 2885 explicit_bzero(passphrase2, strlen(passphrase2)); 2886 free(passphrase1); 2887 free(passphrase2); 2888 printf("Passphrases do not match. Try again.\n"); 2889 goto passphrase_again; 2890 } 2891 /* Clear the other copy of the passphrase. */ 2892 explicit_bzero(passphrase2, strlen(passphrase2)); 2893 free(passphrase2); 2894 } 2895 2896 if (identity_comment) { 2897 strlcpy(comment, identity_comment, sizeof(comment)); 2898 } else { 2899 /* Create default comment field for the passphrase. */ 2900 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2901 } 2902 2903 /* Save the key with the given passphrase and comment. */ 2904 if ((r = sshkey_save_private(private, identity_file, passphrase1, 2905 comment, use_new_format, new_format_cipher, rounds)) != 0) { 2906 error("Saving key \"%s\" failed: %s", 2907 identity_file, ssh_err(r)); 2908 explicit_bzero(passphrase1, strlen(passphrase1)); 2909 free(passphrase1); 2910 exit(1); 2911 } 2912 /* Clear the passphrase. */ 2913 explicit_bzero(passphrase1, strlen(passphrase1)); 2914 free(passphrase1); 2915 2916 /* Clear the private key and the random number generator. */ 2917 sshkey_free(private); 2918 2919 if (!quiet) 2920 printf("Your identification has been saved in %s.\n", identity_file); 2921 2922 strlcat(identity_file, ".pub", sizeof(identity_file)); 2923 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2924 fatal("Unable to save public key to %s: %s", 2925 identity_file, strerror(errno)); 2926 if ((f = fdopen(fd, "w")) == NULL) 2927 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 2928 if ((r = sshkey_write(public, f)) != 0) 2929 error("write key failed: %s", ssh_err(r)); 2930 fprintf(f, " %s\n", comment); 2931 if (ferror(f) || fclose(f) != 0) 2932 fatal("write public failed: %s", strerror(errno)); 2933 2934 if (!quiet) { 2935 fp = sshkey_fingerprint(public, fingerprint_hash, 2936 SSH_FP_DEFAULT); 2937 ra = sshkey_fingerprint(public, fingerprint_hash, 2938 SSH_FP_RANDOMART); 2939 if (fp == NULL || ra == NULL) 2940 fatal("sshkey_fingerprint failed"); 2941 printf("Your public key has been saved in %s.\n", 2942 identity_file); 2943 printf("The key fingerprint is:\n"); 2944 printf("%s %s\n", fp, comment); 2945 printf("The key's randomart image is:\n"); 2946 printf("%s\n", ra); 2947 free(ra); 2948 free(fp); 2949 } 2950 2951 sshkey_free(public); 2952 exit(0); 2953 } 2954