1 /* $OpenBSD: ssh-keygen.c,v 1.326 2019/01/23 04:51:02 djm Exp $ */ 2 /* 3 * Author: Tatu Ylonen <ylo@cs.hut.fi> 4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * Identity and host key generation and maintenance. 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 */ 14 15 #include <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 68 static int quiet = 0; 69 70 /* Flag indicating that we just want to see the key fingerprint */ 71 static int print_fingerprint = 0; 72 static int print_bubblebabble = 0; 73 74 /* Hash algorithm to use for fingerprints. */ 75 static int fingerprint_hash = SSH_FP_HASH_DEFAULT; 76 77 /* The identity file name, given on the command line or entered by the user. */ 78 static char identity_file[1024]; 79 static int have_identity = 0; 80 81 /* This is set to the passphrase if given on the command line. */ 82 static char *identity_passphrase = NULL; 83 84 /* This is set to the new passphrase if given on the command line. */ 85 static char *identity_new_passphrase = NULL; 86 87 /* Key type when certifying */ 88 static u_int cert_key_type = SSH2_CERT_TYPE_USER; 89 90 /* "key ID" of signed key */ 91 static char *cert_key_id = NULL; 92 93 /* Comma-separated list of principal names for certifying keys */ 94 static char *cert_principals = NULL; 95 96 /* Validity period for certificates */ 97 static u_int64_t cert_valid_from = 0; 98 static u_int64_t cert_valid_to = ~0ULL; 99 100 /* Certificate options */ 101 #define CERTOPT_X_FWD (1) 102 #define CERTOPT_AGENT_FWD (1<<1) 103 #define CERTOPT_PORT_FWD (1<<2) 104 #define CERTOPT_PTY (1<<3) 105 #define CERTOPT_USER_RC (1<<4) 106 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 107 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 108 static u_int32_t certflags_flags = CERTOPT_DEFAULT; 109 static char *certflags_command = NULL; 110 static char *certflags_src_addr = NULL; 111 112 /* Arbitrary extensions specified by user */ 113 struct cert_userext { 114 char *key; 115 char *val; 116 int crit; 117 }; 118 static struct cert_userext *cert_userext; 119 static size_t ncert_userext; 120 121 /* Conversion to/from various formats */ 122 enum { 123 FMT_RFC4716, 124 FMT_PKCS8, 125 FMT_PEM 126 } convert_format = FMT_RFC4716; 127 128 static char *key_type_name = NULL; 129 130 /* Load key from this PKCS#11 provider */ 131 static char *pkcs11provider = NULL; 132 133 /* Use new OpenSSH private key format when writing SSH2 keys instead of PEM */ 134 static int use_new_format = 1; 135 136 /* Cipher for new-format private keys */ 137 static char *new_format_cipher = NULL; 138 139 /* 140 * Number of KDF rounds to derive new format keys / 141 * number of primality trials when screening moduli. 142 */ 143 static int rounds = 0; 144 145 /* argv0 */ 146 extern char *__progname; 147 148 static char hostname[NI_MAXHOST]; 149 150 #ifdef WITH_OPENSSL 151 /* moduli.c */ 152 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 153 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 154 unsigned long); 155 #endif 156 157 static void 158 type_bits_valid(int type, const char *name, u_int32_t *bitsp) 159 { 160 #ifdef WITH_OPENSSL 161 u_int maxbits, nid; 162 #endif 163 164 if (type == KEY_UNSPEC) 165 fatal("unknown key type %s", key_type_name); 166 if (*bitsp == 0) { 167 #ifdef WITH_OPENSSL 168 if (type == KEY_DSA) 169 *bitsp = DEFAULT_BITS_DSA; 170 else if (type == KEY_ECDSA) { 171 if (name != NULL && 172 (nid = sshkey_ecdsa_nid_from_name(name)) > 0) 173 *bitsp = sshkey_curve_nid_to_bits(nid); 174 if (*bitsp == 0) 175 *bitsp = DEFAULT_BITS_ECDSA; 176 } else 177 #endif 178 *bitsp = DEFAULT_BITS; 179 } 180 #ifdef WITH_OPENSSL 181 maxbits = (type == KEY_DSA) ? 182 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS; 183 if (*bitsp > maxbits) 184 fatal("key bits exceeds maximum %d", maxbits); 185 switch (type) { 186 case KEY_DSA: 187 if (*bitsp != 1024) 188 fatal("Invalid DSA key length: must be 1024 bits"); 189 break; 190 case KEY_RSA: 191 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE) 192 fatal("Invalid RSA key length: minimum is %d bits", 193 SSH_RSA_MINIMUM_MODULUS_SIZE); 194 break; 195 case KEY_ECDSA: 196 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1) 197 fatal("Invalid ECDSA key length: valid lengths are " 198 "256, 384 or 521 bits"); 199 } 200 #endif 201 } 202 203 static void 204 ask_filename(struct passwd *pw, const char *prompt) 205 { 206 char buf[1024]; 207 char *name = NULL; 208 209 if (key_type_name == NULL) 210 name = _PATH_SSH_CLIENT_ID_RSA; 211 else { 212 switch (sshkey_type_from_name(key_type_name)) { 213 case KEY_DSA_CERT: 214 case KEY_DSA: 215 name = _PATH_SSH_CLIENT_ID_DSA; 216 break; 217 case KEY_ECDSA_CERT: 218 case KEY_ECDSA: 219 name = _PATH_SSH_CLIENT_ID_ECDSA; 220 break; 221 case KEY_RSA_CERT: 222 case KEY_RSA: 223 name = _PATH_SSH_CLIENT_ID_RSA; 224 break; 225 case KEY_ED25519: 226 case KEY_ED25519_CERT: 227 name = _PATH_SSH_CLIENT_ID_ED25519; 228 break; 229 case KEY_XMSS: 230 case KEY_XMSS_CERT: 231 name = _PATH_SSH_CLIENT_ID_XMSS; 232 break; 233 default: 234 fatal("bad key type"); 235 } 236 } 237 snprintf(identity_file, sizeof(identity_file), 238 "%s/%s", pw->pw_dir, name); 239 printf("%s (%s): ", prompt, identity_file); 240 fflush(stdout); 241 if (fgets(buf, sizeof(buf), stdin) == NULL) 242 exit(1); 243 buf[strcspn(buf, "\n")] = '\0'; 244 if (strcmp(buf, "") != 0) 245 strlcpy(identity_file, buf, sizeof(identity_file)); 246 have_identity = 1; 247 } 248 249 static struct sshkey * 250 load_identity(char *filename) 251 { 252 char *pass; 253 struct sshkey *prv; 254 int r; 255 256 if ((r = sshkey_load_private(filename, "", &prv, NULL)) == 0) 257 return prv; 258 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 259 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 260 if (identity_passphrase) 261 pass = xstrdup(identity_passphrase); 262 else 263 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN); 264 r = sshkey_load_private(filename, pass, &prv, NULL); 265 explicit_bzero(pass, strlen(pass)); 266 free(pass); 267 if (r != 0) 268 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 269 return prv; 270 } 271 272 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 273 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 274 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 275 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 276 277 #ifdef WITH_OPENSSL 278 static void 279 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k) 280 { 281 size_t len; 282 u_char *blob; 283 char comment[61]; 284 int r; 285 286 if ((r = sshkey_to_blob(k, &blob, &len)) != 0) 287 fatal("key_to_blob failed: %s", ssh_err(r)); 288 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 289 snprintf(comment, sizeof(comment), 290 "%u-bit %s, converted by %s@%s from OpenSSH", 291 sshkey_size(k), sshkey_type(k), 292 pw->pw_name, hostname); 293 294 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 295 fprintf(stdout, "Comment: \"%s\"\n", comment); 296 dump_base64(stdout, blob, len); 297 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 298 sshkey_free(k); 299 free(blob); 300 exit(0); 301 } 302 303 static void 304 do_convert_to_pkcs8(struct sshkey *k) 305 { 306 switch (sshkey_type_plain(k->type)) { 307 case KEY_RSA: 308 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 309 fatal("PEM_write_RSA_PUBKEY failed"); 310 break; 311 case KEY_DSA: 312 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 313 fatal("PEM_write_DSA_PUBKEY failed"); 314 break; 315 case KEY_ECDSA: 316 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 317 fatal("PEM_write_EC_PUBKEY failed"); 318 break; 319 default: 320 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 321 } 322 exit(0); 323 } 324 325 static void 326 do_convert_to_pem(struct sshkey *k) 327 { 328 switch (sshkey_type_plain(k->type)) { 329 case KEY_RSA: 330 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 331 fatal("PEM_write_RSAPublicKey failed"); 332 break; 333 default: 334 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 335 } 336 exit(0); 337 } 338 339 static void 340 do_convert_to(struct passwd *pw) 341 { 342 struct sshkey *k; 343 struct stat st; 344 int r; 345 346 if (!have_identity) 347 ask_filename(pw, "Enter file in which the key is"); 348 if (stat(identity_file, &st) < 0) 349 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 350 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0) 351 k = load_identity(identity_file); 352 switch (convert_format) { 353 case FMT_RFC4716: 354 do_convert_to_ssh2(pw, k); 355 break; 356 case FMT_PKCS8: 357 do_convert_to_pkcs8(k); 358 break; 359 case FMT_PEM: 360 do_convert_to_pem(k); 361 break; 362 default: 363 fatal("%s: unknown key format %d", __func__, convert_format); 364 } 365 exit(0); 366 } 367 368 /* 369 * This is almost exactly the bignum1 encoding, but with 32 bit for length 370 * instead of 16. 371 */ 372 static void 373 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value) 374 { 375 u_int bytes, bignum_bits; 376 int r; 377 378 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0) 379 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 380 bytes = (bignum_bits + 7) / 8; 381 if (sshbuf_len(b) < bytes) 382 fatal("%s: input buffer too small: need %d have %zu", 383 __func__, bytes, sshbuf_len(b)); 384 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL) 385 fatal("%s: BN_bin2bn failed", __func__); 386 if ((r = sshbuf_consume(b, bytes)) != 0) 387 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 388 } 389 390 static struct sshkey * 391 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 392 { 393 struct sshbuf *b; 394 struct sshkey *key = NULL; 395 char *type, *cipher; 396 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345"; 397 int r, rlen, ktype; 398 u_int magic, i1, i2, i3, i4; 399 size_t slen; 400 u_long e; 401 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL; 402 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL; 403 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL; 404 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL; 405 if ((b = sshbuf_from(blob, blen)) == NULL) 406 fatal("%s: sshbuf_from failed", __func__); 407 if ((r = sshbuf_get_u32(b, &magic)) != 0) 408 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 409 410 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 411 error("bad magic 0x%x != 0x%x", magic, 412 SSH_COM_PRIVATE_KEY_MAGIC); 413 sshbuf_free(b); 414 return NULL; 415 } 416 if ((r = sshbuf_get_u32(b, &i1)) != 0 || 417 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 418 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 || 419 (r = sshbuf_get_u32(b, &i2)) != 0 || 420 (r = sshbuf_get_u32(b, &i3)) != 0 || 421 (r = sshbuf_get_u32(b, &i4)) != 0) 422 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 423 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 424 if (strcmp(cipher, "none") != 0) { 425 error("unsupported cipher %s", cipher); 426 free(cipher); 427 sshbuf_free(b); 428 free(type); 429 return NULL; 430 } 431 free(cipher); 432 433 if (strstr(type, "dsa")) { 434 ktype = KEY_DSA; 435 } else if (strstr(type, "rsa")) { 436 ktype = KEY_RSA; 437 } else { 438 sshbuf_free(b); 439 free(type); 440 return NULL; 441 } 442 if ((key = sshkey_new(ktype)) == NULL) 443 fatal("sshkey_new failed"); 444 free(type); 445 446 switch (key->type) { 447 case KEY_DSA: 448 if ((dsa_p = BN_new()) == NULL || 449 (dsa_q = BN_new()) == NULL || 450 (dsa_g = BN_new()) == NULL || 451 (dsa_pub_key = BN_new()) == NULL || 452 (dsa_priv_key = BN_new()) == NULL) 453 fatal("%s: BN_new", __func__); 454 buffer_get_bignum_bits(b, dsa_p); 455 buffer_get_bignum_bits(b, dsa_g); 456 buffer_get_bignum_bits(b, dsa_q); 457 buffer_get_bignum_bits(b, dsa_pub_key); 458 buffer_get_bignum_bits(b, dsa_priv_key); 459 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) 460 fatal("%s: DSA_set0_pqg failed", __func__); 461 dsa_p = dsa_q = dsa_g = NULL; /* transferred */ 462 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key)) 463 fatal("%s: DSA_set0_key failed", __func__); 464 dsa_pub_key = dsa_priv_key = NULL; /* transferred */ 465 break; 466 case KEY_RSA: 467 if ((r = sshbuf_get_u8(b, &e1)) != 0 || 468 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) || 469 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0)) 470 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 471 e = e1; 472 debug("e %lx", e); 473 if (e < 30) { 474 e <<= 8; 475 e += e2; 476 debug("e %lx", e); 477 e <<= 8; 478 e += e3; 479 debug("e %lx", e); 480 } 481 if ((rsa_e = BN_new()) == NULL) 482 fatal("%s: BN_new", __func__); 483 if (!BN_set_word(rsa_e, e)) { 484 BN_clear_free(rsa_e); 485 sshbuf_free(b); 486 sshkey_free(key); 487 return NULL; 488 } 489 if ((rsa_n = BN_new()) == NULL || 490 (rsa_d = BN_new()) == NULL || 491 (rsa_p = BN_new()) == NULL || 492 (rsa_q = BN_new()) == NULL || 493 (rsa_iqmp = BN_new()) == NULL) 494 fatal("%s: BN_new", __func__); 495 buffer_get_bignum_bits(b, rsa_d); 496 buffer_get_bignum_bits(b, rsa_n); 497 buffer_get_bignum_bits(b, rsa_iqmp); 498 buffer_get_bignum_bits(b, rsa_q); 499 buffer_get_bignum_bits(b, rsa_p); 500 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d)) 501 fatal("%s: RSA_set0_key failed", __func__); 502 rsa_n = rsa_e = rsa_d = NULL; /* transferred */ 503 if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q)) 504 fatal("%s: RSA_set0_factors failed", __func__); 505 rsa_p = rsa_q = NULL; /* transferred */ 506 if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0) 507 fatal("generate RSA parameters failed: %s", ssh_err(r)); 508 BN_clear_free(rsa_iqmp); 509 break; 510 } 511 rlen = sshbuf_len(b); 512 if (rlen != 0) 513 error("do_convert_private_ssh2_from_blob: " 514 "remaining bytes in key blob %d", rlen); 515 sshbuf_free(b); 516 517 /* try the key */ 518 if (sshkey_sign(key, &sig, &slen, data, sizeof(data), NULL, 0) != 0 || 519 sshkey_verify(key, sig, slen, data, sizeof(data), NULL, 0) != 0) { 520 sshkey_free(key); 521 free(sig); 522 return NULL; 523 } 524 free(sig); 525 return key; 526 } 527 528 static int 529 get_line(FILE *fp, char *line, size_t len) 530 { 531 int c; 532 size_t pos = 0; 533 534 line[0] = '\0'; 535 while ((c = fgetc(fp)) != EOF) { 536 if (pos >= len - 1) 537 fatal("input line too long."); 538 switch (c) { 539 case '\r': 540 c = fgetc(fp); 541 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) 542 fatal("unget: %s", strerror(errno)); 543 return pos; 544 case '\n': 545 return pos; 546 } 547 line[pos++] = c; 548 line[pos] = '\0'; 549 } 550 /* We reached EOF */ 551 return -1; 552 } 553 554 static void 555 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private) 556 { 557 int r, blen, escaped = 0; 558 u_int len; 559 char line[1024]; 560 u_char blob[8096]; 561 char encoded[8096]; 562 FILE *fp; 563 564 if ((fp = fopen(identity_file, "r")) == NULL) 565 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 566 encoded[0] = '\0'; 567 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 568 if (blen > 0 && line[blen - 1] == '\\') 569 escaped++; 570 if (strncmp(line, "----", 4) == 0 || 571 strstr(line, ": ") != NULL) { 572 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 573 *private = 1; 574 if (strstr(line, " END ") != NULL) { 575 break; 576 } 577 /* fprintf(stderr, "ignore: %s", line); */ 578 continue; 579 } 580 if (escaped) { 581 escaped--; 582 /* fprintf(stderr, "escaped: %s", line); */ 583 continue; 584 } 585 strlcat(encoded, line, sizeof(encoded)); 586 } 587 len = strlen(encoded); 588 if (((len % 4) == 3) && 589 (encoded[len-1] == '=') && 590 (encoded[len-2] == '=') && 591 (encoded[len-3] == '=')) 592 encoded[len-3] = '\0'; 593 blen = uudecode(encoded, blob, sizeof(blob)); 594 if (blen < 0) 595 fatal("uudecode failed."); 596 if (*private) 597 *k = do_convert_private_ssh2_from_blob(blob, blen); 598 else if ((r = sshkey_from_blob(blob, blen, k)) != 0) 599 fatal("decode blob failed: %s", ssh_err(r)); 600 fclose(fp); 601 } 602 603 static void 604 do_convert_from_pkcs8(struct sshkey **k, int *private) 605 { 606 EVP_PKEY *pubkey; 607 FILE *fp; 608 609 if ((fp = fopen(identity_file, "r")) == NULL) 610 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 611 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 612 fatal("%s: %s is not a recognised public key format", __func__, 613 identity_file); 614 } 615 fclose(fp); 616 switch (EVP_PKEY_base_id(pubkey)) { 617 case EVP_PKEY_RSA: 618 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 619 fatal("sshkey_new failed"); 620 (*k)->type = KEY_RSA; 621 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 622 break; 623 case EVP_PKEY_DSA: 624 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 625 fatal("sshkey_new failed"); 626 (*k)->type = KEY_DSA; 627 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 628 break; 629 case EVP_PKEY_EC: 630 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 631 fatal("sshkey_new failed"); 632 (*k)->type = KEY_ECDSA; 633 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 634 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa); 635 break; 636 default: 637 fatal("%s: unsupported pubkey type %d", __func__, 638 EVP_PKEY_base_id(pubkey)); 639 } 640 EVP_PKEY_free(pubkey); 641 return; 642 } 643 644 static void 645 do_convert_from_pem(struct sshkey **k, int *private) 646 { 647 FILE *fp; 648 RSA *rsa; 649 650 if ((fp = fopen(identity_file, "r")) == NULL) 651 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 652 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 653 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 654 fatal("sshkey_new failed"); 655 (*k)->type = KEY_RSA; 656 (*k)->rsa = rsa; 657 fclose(fp); 658 return; 659 } 660 fatal("%s: unrecognised raw private key format", __func__); 661 } 662 663 static void 664 do_convert_from(struct passwd *pw) 665 { 666 struct sshkey *k = NULL; 667 int r, private = 0, ok = 0; 668 struct stat st; 669 670 if (!have_identity) 671 ask_filename(pw, "Enter file in which the key is"); 672 if (stat(identity_file, &st) < 0) 673 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 674 675 switch (convert_format) { 676 case FMT_RFC4716: 677 do_convert_from_ssh2(pw, &k, &private); 678 break; 679 case FMT_PKCS8: 680 do_convert_from_pkcs8(&k, &private); 681 break; 682 case FMT_PEM: 683 do_convert_from_pem(&k, &private); 684 break; 685 default: 686 fatal("%s: unknown key format %d", __func__, convert_format); 687 } 688 689 if (!private) { 690 if ((r = sshkey_write(k, stdout)) == 0) 691 ok = 1; 692 if (ok) 693 fprintf(stdout, "\n"); 694 } else { 695 switch (k->type) { 696 case KEY_DSA: 697 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 698 NULL, 0, NULL, NULL); 699 break; 700 case KEY_ECDSA: 701 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 702 NULL, 0, NULL, NULL); 703 break; 704 case KEY_RSA: 705 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 706 NULL, 0, NULL, NULL); 707 break; 708 default: 709 fatal("%s: unsupported key type %s", __func__, 710 sshkey_type(k)); 711 } 712 } 713 714 if (!ok) 715 fatal("key write failed"); 716 sshkey_free(k); 717 exit(0); 718 } 719 #endif 720 721 static void 722 do_print_public(struct passwd *pw) 723 { 724 struct sshkey *prv; 725 struct stat st; 726 int r; 727 728 if (!have_identity) 729 ask_filename(pw, "Enter file in which the key is"); 730 if (stat(identity_file, &st) < 0) 731 fatal("%s: %s", identity_file, strerror(errno)); 732 prv = load_identity(identity_file); 733 if ((r = sshkey_write(prv, stdout)) != 0) 734 error("sshkey_write failed: %s", ssh_err(r)); 735 sshkey_free(prv); 736 fprintf(stdout, "\n"); 737 exit(0); 738 } 739 740 static void 741 do_download(struct passwd *pw) 742 { 743 #ifdef ENABLE_PKCS11 744 struct sshkey **keys = NULL; 745 int i, nkeys; 746 enum sshkey_fp_rep rep; 747 int fptype; 748 char *fp, *ra; 749 750 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 751 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 752 753 pkcs11_init(0); 754 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys); 755 if (nkeys <= 0) 756 fatal("cannot read public key from pkcs11"); 757 for (i = 0; i < nkeys; i++) { 758 if (print_fingerprint) { 759 fp = sshkey_fingerprint(keys[i], fptype, rep); 760 ra = sshkey_fingerprint(keys[i], fingerprint_hash, 761 SSH_FP_RANDOMART); 762 if (fp == NULL || ra == NULL) 763 fatal("%s: sshkey_fingerprint fail", __func__); 764 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]), 765 fp, sshkey_type(keys[i])); 766 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 767 printf("%s\n", ra); 768 free(ra); 769 free(fp); 770 } else { 771 (void) sshkey_write(keys[i], stdout); /* XXX check */ 772 fprintf(stdout, "\n"); 773 } 774 sshkey_free(keys[i]); 775 } 776 free(keys); 777 pkcs11_terminate(); 778 exit(0); 779 #else 780 fatal("no pkcs11 support"); 781 #endif /* ENABLE_PKCS11 */ 782 } 783 784 static struct sshkey * 785 try_read_key(char **cpp) 786 { 787 struct sshkey *ret; 788 int r; 789 790 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL) 791 fatal("sshkey_new failed"); 792 if ((r = sshkey_read(ret, cpp)) == 0) 793 return ret; 794 /* Not a key */ 795 sshkey_free(ret); 796 return NULL; 797 } 798 799 static void 800 fingerprint_one_key(const struct sshkey *public, const char *comment) 801 { 802 char *fp = NULL, *ra = NULL; 803 enum sshkey_fp_rep rep; 804 int fptype; 805 806 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 807 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 808 fp = sshkey_fingerprint(public, fptype, rep); 809 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART); 810 if (fp == NULL || ra == NULL) 811 fatal("%s: sshkey_fingerprint failed", __func__); 812 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp, 813 comment ? comment : "no comment", sshkey_type(public)); 814 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 815 printf("%s\n", ra); 816 free(ra); 817 free(fp); 818 } 819 820 static void 821 fingerprint_private(const char *path) 822 { 823 struct stat st; 824 char *comment = NULL; 825 struct sshkey *public = NULL; 826 int r; 827 828 if (stat(identity_file, &st) < 0) 829 fatal("%s: %s", path, strerror(errno)); 830 if ((r = sshkey_load_public(path, &public, &comment)) != 0) { 831 debug("load public \"%s\": %s", path, ssh_err(r)); 832 if ((r = sshkey_load_private(path, NULL, 833 &public, &comment)) != 0) { 834 debug("load private \"%s\": %s", path, ssh_err(r)); 835 fatal("%s is not a key file.", path); 836 } 837 } 838 839 fingerprint_one_key(public, comment); 840 sshkey_free(public); 841 free(comment); 842 } 843 844 static void 845 do_fingerprint(struct passwd *pw) 846 { 847 FILE *f; 848 struct sshkey *public = NULL; 849 char *comment = NULL, *cp, *ep, *line = NULL; 850 size_t linesize = 0; 851 int i, invalid = 1; 852 const char *path; 853 u_long lnum = 0; 854 855 if (!have_identity) 856 ask_filename(pw, "Enter file in which the key is"); 857 path = identity_file; 858 859 if (strcmp(identity_file, "-") == 0) { 860 f = stdin; 861 path = "(stdin)"; 862 } else if ((f = fopen(path, "r")) == NULL) 863 fatal("%s: %s: %s", __progname, path, strerror(errno)); 864 865 while (getline(&line, &linesize, f) != -1) { 866 lnum++; 867 cp = line; 868 cp[strcspn(cp, "\n")] = '\0'; 869 /* Trim leading space and comments */ 870 cp = line + strspn(line, " \t"); 871 if (*cp == '#' || *cp == '\0') 872 continue; 873 874 /* 875 * Input may be plain keys, private keys, authorized_keys 876 * or known_hosts. 877 */ 878 879 /* 880 * Try private keys first. Assume a key is private if 881 * "SSH PRIVATE KEY" appears on the first line and we're 882 * not reading from stdin (XXX support private keys on stdin). 883 */ 884 if (lnum == 1 && strcmp(identity_file, "-") != 0 && 885 strstr(cp, "PRIVATE KEY") != NULL) { 886 free(line); 887 fclose(f); 888 fingerprint_private(path); 889 exit(0); 890 } 891 892 /* 893 * If it's not a private key, then this must be prepared to 894 * accept a public key prefixed with a hostname or options. 895 * Try a bare key first, otherwise skip the leading stuff. 896 */ 897 if ((public = try_read_key(&cp)) == NULL) { 898 i = strtol(cp, &ep, 10); 899 if (i == 0 || ep == NULL || 900 (*ep != ' ' && *ep != '\t')) { 901 int quoted = 0; 902 903 comment = cp; 904 for (; *cp && (quoted || (*cp != ' ' && 905 *cp != '\t')); cp++) { 906 if (*cp == '\\' && cp[1] == '"') 907 cp++; /* Skip both */ 908 else if (*cp == '"') 909 quoted = !quoted; 910 } 911 if (!*cp) 912 continue; 913 *cp++ = '\0'; 914 } 915 } 916 /* Retry after parsing leading hostname/key options */ 917 if (public == NULL && (public = try_read_key(&cp)) == NULL) { 918 debug("%s:%lu: not a public key", path, lnum); 919 continue; 920 } 921 922 /* Find trailing comment, if any */ 923 for (; *cp == ' ' || *cp == '\t'; cp++) 924 ; 925 if (*cp != '\0' && *cp != '#') 926 comment = cp; 927 928 fingerprint_one_key(public, comment); 929 sshkey_free(public); 930 invalid = 0; /* One good key in the file is sufficient */ 931 } 932 fclose(f); 933 free(line); 934 935 if (invalid) 936 fatal("%s is not a public key file.", path); 937 exit(0); 938 } 939 940 static void 941 do_gen_all_hostkeys(struct passwd *pw) 942 { 943 struct { 944 char *key_type; 945 char *key_type_display; 946 char *path; 947 } key_types[] = { 948 #ifdef WITH_OPENSSL 949 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 950 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 951 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 952 #endif /* WITH_OPENSSL */ 953 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE }, 954 #ifdef WITH_XMSS 955 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE }, 956 #endif /* WITH_XMSS */ 957 { NULL, NULL, NULL } 958 }; 959 960 u_int bits = 0; 961 int first = 0; 962 struct stat st; 963 struct sshkey *private, *public; 964 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file; 965 int i, type, fd, r; 966 FILE *f; 967 968 for (i = 0; key_types[i].key_type; i++) { 969 public = private = NULL; 970 prv_tmp = pub_tmp = prv_file = pub_file = NULL; 971 972 xasprintf(&prv_file, "%s%s", 973 identity_file, key_types[i].path); 974 975 /* Check whether private key exists and is not zero-length */ 976 if (stat(prv_file, &st) == 0) { 977 if (st.st_size != 0) 978 goto next; 979 } else if (errno != ENOENT) { 980 error("Could not stat %s: %s", key_types[i].path, 981 strerror(errno)); 982 goto failnext; 983 } 984 985 /* 986 * Private key doesn't exist or is invalid; proceed with 987 * key generation. 988 */ 989 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX", 990 identity_file, key_types[i].path); 991 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX", 992 identity_file, key_types[i].path); 993 xasprintf(&pub_file, "%s%s.pub", 994 identity_file, key_types[i].path); 995 996 if (first == 0) { 997 first = 1; 998 printf("%s: generating new host keys: ", __progname); 999 } 1000 printf("%s ", key_types[i].key_type_display); 1001 fflush(stdout); 1002 type = sshkey_type_from_name(key_types[i].key_type); 1003 if ((fd = mkstemp(prv_tmp)) == -1) { 1004 error("Could not save your public key in %s: %s", 1005 prv_tmp, strerror(errno)); 1006 goto failnext; 1007 } 1008 close(fd); /* just using mkstemp() to generate/reserve a name */ 1009 bits = 0; 1010 type_bits_valid(type, NULL, &bits); 1011 if ((r = sshkey_generate(type, bits, &private)) != 0) { 1012 error("sshkey_generate failed: %s", ssh_err(r)); 1013 goto failnext; 1014 } 1015 if ((r = sshkey_from_private(private, &public)) != 0) 1016 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1017 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 1018 hostname); 1019 if ((r = sshkey_save_private(private, prv_tmp, "", 1020 comment, use_new_format, new_format_cipher, rounds)) != 0) { 1021 error("Saving key \"%s\" failed: %s", 1022 prv_tmp, ssh_err(r)); 1023 goto failnext; 1024 } 1025 if ((fd = mkstemp(pub_tmp)) == -1) { 1026 error("Could not save your public key in %s: %s", 1027 pub_tmp, strerror(errno)); 1028 goto failnext; 1029 } 1030 (void)fchmod(fd, 0644); 1031 f = fdopen(fd, "w"); 1032 if (f == NULL) { 1033 error("fdopen %s failed: %s", pub_tmp, strerror(errno)); 1034 close(fd); 1035 goto failnext; 1036 } 1037 if ((r = sshkey_write(public, f)) != 0) { 1038 error("write key failed: %s", ssh_err(r)); 1039 fclose(f); 1040 goto failnext; 1041 } 1042 fprintf(f, " %s\n", comment); 1043 if (ferror(f) != 0) { 1044 error("write key failed: %s", strerror(errno)); 1045 fclose(f); 1046 goto failnext; 1047 } 1048 if (fclose(f) != 0) { 1049 error("key close failed: %s", strerror(errno)); 1050 goto failnext; 1051 } 1052 1053 /* Rename temporary files to their permanent locations. */ 1054 if (rename(pub_tmp, pub_file) != 0) { 1055 error("Unable to move %s into position: %s", 1056 pub_file, strerror(errno)); 1057 goto failnext; 1058 } 1059 if (rename(prv_tmp, prv_file) != 0) { 1060 error("Unable to move %s into position: %s", 1061 key_types[i].path, strerror(errno)); 1062 failnext: 1063 first = 0; 1064 goto next; 1065 } 1066 next: 1067 sshkey_free(private); 1068 sshkey_free(public); 1069 free(prv_tmp); 1070 free(pub_tmp); 1071 free(prv_file); 1072 free(pub_file); 1073 } 1074 if (first != 0) 1075 printf("\n"); 1076 } 1077 1078 struct known_hosts_ctx { 1079 const char *host; /* Hostname searched for in find/delete case */ 1080 FILE *out; /* Output file, stdout for find_hosts case */ 1081 int has_unhashed; /* When hashing, original had unhashed hosts */ 1082 int found_key; /* For find/delete, host was found */ 1083 int invalid; /* File contained invalid items; don't delete */ 1084 int hash_hosts; /* Hash hostnames as we go */ 1085 int find_host; /* Search for specific hostname */ 1086 int delete_host; /* Delete host from known_hosts */ 1087 }; 1088 1089 static int 1090 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx) 1091 { 1092 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1093 char *hashed, *cp, *hosts, *ohosts; 1094 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts); 1095 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM; 1096 1097 switch (l->status) { 1098 case HKF_STATUS_OK: 1099 case HKF_STATUS_MATCHED: 1100 /* 1101 * Don't hash hosts already already hashed, with wildcard 1102 * characters or a CA/revocation marker. 1103 */ 1104 if (was_hashed || has_wild || l->marker != MRK_NONE) { 1105 fprintf(ctx->out, "%s\n", l->line); 1106 if (has_wild && !ctx->find_host) { 1107 logit("%s:%lu: ignoring host name " 1108 "with wildcard: %.64s", l->path, 1109 l->linenum, l->hosts); 1110 } 1111 return 0; 1112 } 1113 /* 1114 * Split any comma-separated hostnames from the host list, 1115 * hash and store separately. 1116 */ 1117 ohosts = hosts = xstrdup(l->hosts); 1118 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') { 1119 lowercase(cp); 1120 if ((hashed = host_hash(cp, NULL, 0)) == NULL) 1121 fatal("hash_host failed"); 1122 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey); 1123 ctx->has_unhashed = 1; 1124 } 1125 free(ohosts); 1126 return 0; 1127 case HKF_STATUS_INVALID: 1128 /* Retain invalid lines, but mark file as invalid. */ 1129 ctx->invalid = 1; 1130 logit("%s:%lu: invalid line", l->path, l->linenum); 1131 /* FALLTHROUGH */ 1132 default: 1133 fprintf(ctx->out, "%s\n", l->line); 1134 return 0; 1135 } 1136 /* NOTREACHED */ 1137 return -1; 1138 } 1139 1140 static int 1141 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx) 1142 { 1143 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1144 enum sshkey_fp_rep rep; 1145 int fptype; 1146 char *fp; 1147 1148 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 1149 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 1150 1151 if (l->status == HKF_STATUS_MATCHED) { 1152 if (ctx->delete_host) { 1153 if (l->marker != MRK_NONE) { 1154 /* Don't remove CA and revocation lines */ 1155 fprintf(ctx->out, "%s\n", l->line); 1156 } else { 1157 /* 1158 * Hostname matches and has no CA/revoke 1159 * marker, delete it by *not* writing the 1160 * line to ctx->out. 1161 */ 1162 ctx->found_key = 1; 1163 if (!quiet) 1164 printf("# Host %s found: line %lu\n", 1165 ctx->host, l->linenum); 1166 } 1167 return 0; 1168 } else if (ctx->find_host) { 1169 ctx->found_key = 1; 1170 if (!quiet) { 1171 printf("# Host %s found: line %lu %s\n", 1172 ctx->host, 1173 l->linenum, l->marker == MRK_CA ? "CA" : 1174 (l->marker == MRK_REVOKE ? "REVOKED" : "")); 1175 } 1176 if (ctx->hash_hosts) 1177 known_hosts_hash(l, ctx); 1178 else if (print_fingerprint) { 1179 fp = sshkey_fingerprint(l->key, fptype, rep); 1180 mprintf("%s %s %s %s\n", ctx->host, 1181 sshkey_type(l->key), fp, l->comment); 1182 free(fp); 1183 } else 1184 fprintf(ctx->out, "%s\n", l->line); 1185 return 0; 1186 } 1187 } else if (ctx->delete_host) { 1188 /* Retain non-matching hosts when deleting */ 1189 if (l->status == HKF_STATUS_INVALID) { 1190 ctx->invalid = 1; 1191 logit("%s:%lu: invalid line", l->path, l->linenum); 1192 } 1193 fprintf(ctx->out, "%s\n", l->line); 1194 } 1195 return 0; 1196 } 1197 1198 static void 1199 do_known_hosts(struct passwd *pw, const char *name, int find_host, 1200 int delete_host, int hash_hosts) 1201 { 1202 char *cp, tmp[PATH_MAX], old[PATH_MAX]; 1203 int r, fd, oerrno, inplace = 0; 1204 struct known_hosts_ctx ctx; 1205 u_int foreach_options; 1206 1207 if (!have_identity) { 1208 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1209 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1210 sizeof(identity_file)) 1211 fatal("Specified known hosts path too long"); 1212 free(cp); 1213 have_identity = 1; 1214 } 1215 1216 memset(&ctx, 0, sizeof(ctx)); 1217 ctx.out = stdout; 1218 ctx.host = name; 1219 ctx.hash_hosts = hash_hosts; 1220 ctx.find_host = find_host; 1221 ctx.delete_host = delete_host; 1222 1223 /* 1224 * Find hosts goes to stdout, hash and deletions happen in-place 1225 * A corner case is ssh-keygen -HF foo, which should go to stdout 1226 */ 1227 if (!find_host && (hash_hosts || delete_host)) { 1228 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1229 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1230 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1231 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1232 fatal("known_hosts path too long"); 1233 umask(077); 1234 if ((fd = mkstemp(tmp)) == -1) 1235 fatal("mkstemp: %s", strerror(errno)); 1236 if ((ctx.out = fdopen(fd, "w")) == NULL) { 1237 oerrno = errno; 1238 unlink(tmp); 1239 fatal("fdopen: %s", strerror(oerrno)); 1240 } 1241 inplace = 1; 1242 } 1243 /* XXX support identity_file == "-" for stdin */ 1244 foreach_options = find_host ? HKF_WANT_MATCH : 0; 1245 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0; 1246 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ? 1247 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL, 1248 foreach_options)) != 0) { 1249 if (inplace) 1250 unlink(tmp); 1251 fatal("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r)); 1252 } 1253 1254 if (inplace) 1255 fclose(ctx.out); 1256 1257 if (ctx.invalid) { 1258 error("%s is not a valid known_hosts file.", identity_file); 1259 if (inplace) { 1260 error("Not replacing existing known_hosts " 1261 "file because of errors"); 1262 unlink(tmp); 1263 } 1264 exit(1); 1265 } else if (delete_host && !ctx.found_key) { 1266 logit("Host %s not found in %s", name, identity_file); 1267 if (inplace) 1268 unlink(tmp); 1269 } else if (inplace) { 1270 /* Backup existing file */ 1271 if (unlink(old) == -1 && errno != ENOENT) 1272 fatal("unlink %.100s: %s", old, strerror(errno)); 1273 if (link(identity_file, old) == -1) 1274 fatal("link %.100s to %.100s: %s", identity_file, old, 1275 strerror(errno)); 1276 /* Move new one into place */ 1277 if (rename(tmp, identity_file) == -1) { 1278 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1279 strerror(errno)); 1280 unlink(tmp); 1281 unlink(old); 1282 exit(1); 1283 } 1284 1285 printf("%s updated.\n", identity_file); 1286 printf("Original contents retained as %s\n", old); 1287 if (ctx.has_unhashed) { 1288 logit("WARNING: %s contains unhashed entries", old); 1289 logit("Delete this file to ensure privacy " 1290 "of hostnames"); 1291 } 1292 } 1293 1294 exit (find_host && !ctx.found_key); 1295 } 1296 1297 /* 1298 * Perform changing a passphrase. The argument is the passwd structure 1299 * for the current user. 1300 */ 1301 static void 1302 do_change_passphrase(struct passwd *pw) 1303 { 1304 char *comment; 1305 char *old_passphrase, *passphrase1, *passphrase2; 1306 struct stat st; 1307 struct sshkey *private; 1308 int r; 1309 1310 if (!have_identity) 1311 ask_filename(pw, "Enter file in which the key is"); 1312 if (stat(identity_file, &st) < 0) 1313 fatal("%s: %s", identity_file, strerror(errno)); 1314 /* Try to load the file with empty passphrase. */ 1315 r = sshkey_load_private(identity_file, "", &private, &comment); 1316 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) { 1317 if (identity_passphrase) 1318 old_passphrase = xstrdup(identity_passphrase); 1319 else 1320 old_passphrase = 1321 read_passphrase("Enter old passphrase: ", 1322 RP_ALLOW_STDIN); 1323 r = sshkey_load_private(identity_file, old_passphrase, 1324 &private, &comment); 1325 explicit_bzero(old_passphrase, strlen(old_passphrase)); 1326 free(old_passphrase); 1327 if (r != 0) 1328 goto badkey; 1329 } else if (r != 0) { 1330 badkey: 1331 fatal("Failed to load key %s: %s", identity_file, ssh_err(r)); 1332 } 1333 if (comment) 1334 mprintf("Key has comment '%s'\n", comment); 1335 1336 /* Ask the new passphrase (twice). */ 1337 if (identity_new_passphrase) { 1338 passphrase1 = xstrdup(identity_new_passphrase); 1339 passphrase2 = NULL; 1340 } else { 1341 passphrase1 = 1342 read_passphrase("Enter new passphrase (empty for no " 1343 "passphrase): ", RP_ALLOW_STDIN); 1344 passphrase2 = read_passphrase("Enter same passphrase again: ", 1345 RP_ALLOW_STDIN); 1346 1347 /* Verify that they are the same. */ 1348 if (strcmp(passphrase1, passphrase2) != 0) { 1349 explicit_bzero(passphrase1, strlen(passphrase1)); 1350 explicit_bzero(passphrase2, strlen(passphrase2)); 1351 free(passphrase1); 1352 free(passphrase2); 1353 printf("Pass phrases do not match. Try again.\n"); 1354 exit(1); 1355 } 1356 /* Destroy the other copy. */ 1357 explicit_bzero(passphrase2, strlen(passphrase2)); 1358 free(passphrase2); 1359 } 1360 1361 /* Save the file using the new passphrase. */ 1362 if ((r = sshkey_save_private(private, identity_file, passphrase1, 1363 comment, use_new_format, new_format_cipher, rounds)) != 0) { 1364 error("Saving key \"%s\" failed: %s.", 1365 identity_file, ssh_err(r)); 1366 explicit_bzero(passphrase1, strlen(passphrase1)); 1367 free(passphrase1); 1368 sshkey_free(private); 1369 free(comment); 1370 exit(1); 1371 } 1372 /* Destroy the passphrase and the copy of the key in memory. */ 1373 explicit_bzero(passphrase1, strlen(passphrase1)); 1374 free(passphrase1); 1375 sshkey_free(private); /* Destroys contents */ 1376 free(comment); 1377 1378 printf("Your identification has been saved with the new passphrase.\n"); 1379 exit(0); 1380 } 1381 1382 /* 1383 * Print the SSHFP RR. 1384 */ 1385 static int 1386 do_print_resource_record(struct passwd *pw, char *fname, char *hname, 1387 int print_generic) 1388 { 1389 struct sshkey *public; 1390 char *comment = NULL; 1391 struct stat st; 1392 int r; 1393 1394 if (fname == NULL) 1395 fatal("%s: no filename", __func__); 1396 if (stat(fname, &st) < 0) { 1397 if (errno == ENOENT) 1398 return 0; 1399 fatal("%s: %s", fname, strerror(errno)); 1400 } 1401 if ((r = sshkey_load_public(fname, &public, &comment)) != 0) 1402 fatal("Failed to read v2 public key from \"%s\": %s.", 1403 fname, ssh_err(r)); 1404 export_dns_rr(hname, public, stdout, print_generic); 1405 sshkey_free(public); 1406 free(comment); 1407 return 1; 1408 } 1409 1410 /* 1411 * Change the comment of a private key file. 1412 */ 1413 static void 1414 do_change_comment(struct passwd *pw, const char *identity_comment) 1415 { 1416 char new_comment[1024], *comment, *passphrase; 1417 struct sshkey *private; 1418 struct sshkey *public; 1419 struct stat st; 1420 FILE *f; 1421 int r, fd; 1422 1423 if (!have_identity) 1424 ask_filename(pw, "Enter file in which the key is"); 1425 if (stat(identity_file, &st) < 0) 1426 fatal("%s: %s", identity_file, strerror(errno)); 1427 if ((r = sshkey_load_private(identity_file, "", 1428 &private, &comment)) == 0) 1429 passphrase = xstrdup(""); 1430 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 1431 fatal("Cannot load private key \"%s\": %s.", 1432 identity_file, ssh_err(r)); 1433 else { 1434 if (identity_passphrase) 1435 passphrase = xstrdup(identity_passphrase); 1436 else if (identity_new_passphrase) 1437 passphrase = xstrdup(identity_new_passphrase); 1438 else 1439 passphrase = read_passphrase("Enter passphrase: ", 1440 RP_ALLOW_STDIN); 1441 /* Try to load using the passphrase. */ 1442 if ((r = sshkey_load_private(identity_file, passphrase, 1443 &private, &comment)) != 0) { 1444 explicit_bzero(passphrase, strlen(passphrase)); 1445 free(passphrase); 1446 fatal("Cannot load private key \"%s\": %s.", 1447 identity_file, ssh_err(r)); 1448 } 1449 } 1450 1451 if (private->type != KEY_ED25519 && private->type != KEY_XMSS && 1452 !use_new_format) { 1453 error("Comments are only supported for keys stored in " 1454 "the new format (-o)."); 1455 explicit_bzero(passphrase, strlen(passphrase)); 1456 sshkey_free(private); 1457 exit(1); 1458 } 1459 if (comment) 1460 printf("Key now has comment '%s'\n", comment); 1461 else 1462 printf("Key now has no comment\n"); 1463 1464 if (identity_comment) { 1465 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1466 } else { 1467 printf("Enter new comment: "); 1468 fflush(stdout); 1469 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1470 explicit_bzero(passphrase, strlen(passphrase)); 1471 sshkey_free(private); 1472 exit(1); 1473 } 1474 new_comment[strcspn(new_comment, "\n")] = '\0'; 1475 } 1476 1477 /* Save the file using the new passphrase. */ 1478 if ((r = sshkey_save_private(private, identity_file, passphrase, 1479 new_comment, use_new_format, new_format_cipher, rounds)) != 0) { 1480 error("Saving key \"%s\" failed: %s", 1481 identity_file, ssh_err(r)); 1482 explicit_bzero(passphrase, strlen(passphrase)); 1483 free(passphrase); 1484 sshkey_free(private); 1485 free(comment); 1486 exit(1); 1487 } 1488 explicit_bzero(passphrase, strlen(passphrase)); 1489 free(passphrase); 1490 if ((r = sshkey_from_private(private, &public)) != 0) 1491 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1492 sshkey_free(private); 1493 1494 strlcat(identity_file, ".pub", sizeof(identity_file)); 1495 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1496 if (fd == -1) 1497 fatal("Could not save your public key in %s", identity_file); 1498 f = fdopen(fd, "w"); 1499 if (f == NULL) 1500 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 1501 if ((r = sshkey_write(public, f)) != 0) 1502 fatal("write key failed: %s", ssh_err(r)); 1503 sshkey_free(public); 1504 fprintf(f, " %s\n", new_comment); 1505 fclose(f); 1506 1507 free(comment); 1508 1509 printf("The comment in your key file has been changed.\n"); 1510 exit(0); 1511 } 1512 1513 static void 1514 add_flag_option(struct sshbuf *c, const char *name) 1515 { 1516 int r; 1517 1518 debug3("%s: %s", __func__, name); 1519 if ((r = sshbuf_put_cstring(c, name)) != 0 || 1520 (r = sshbuf_put_string(c, NULL, 0)) != 0) 1521 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1522 } 1523 1524 static void 1525 add_string_option(struct sshbuf *c, const char *name, const char *value) 1526 { 1527 struct sshbuf *b; 1528 int r; 1529 1530 debug3("%s: %s=%s", __func__, name, value); 1531 if ((b = sshbuf_new()) == NULL) 1532 fatal("%s: sshbuf_new failed", __func__); 1533 if ((r = sshbuf_put_cstring(b, value)) != 0 || 1534 (r = sshbuf_put_cstring(c, name)) != 0 || 1535 (r = sshbuf_put_stringb(c, b)) != 0) 1536 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1537 1538 sshbuf_free(b); 1539 } 1540 1541 #define OPTIONS_CRITICAL 1 1542 #define OPTIONS_EXTENSIONS 2 1543 static void 1544 prepare_options_buf(struct sshbuf *c, int which) 1545 { 1546 size_t i; 1547 1548 sshbuf_reset(c); 1549 if ((which & OPTIONS_CRITICAL) != 0 && 1550 certflags_command != NULL) 1551 add_string_option(c, "force-command", certflags_command); 1552 if ((which & OPTIONS_EXTENSIONS) != 0 && 1553 (certflags_flags & CERTOPT_X_FWD) != 0) 1554 add_flag_option(c, "permit-X11-forwarding"); 1555 if ((which & OPTIONS_EXTENSIONS) != 0 && 1556 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1557 add_flag_option(c, "permit-agent-forwarding"); 1558 if ((which & OPTIONS_EXTENSIONS) != 0 && 1559 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1560 add_flag_option(c, "permit-port-forwarding"); 1561 if ((which & OPTIONS_EXTENSIONS) != 0 && 1562 (certflags_flags & CERTOPT_PTY) != 0) 1563 add_flag_option(c, "permit-pty"); 1564 if ((which & OPTIONS_EXTENSIONS) != 0 && 1565 (certflags_flags & CERTOPT_USER_RC) != 0) 1566 add_flag_option(c, "permit-user-rc"); 1567 if ((which & OPTIONS_CRITICAL) != 0 && 1568 certflags_src_addr != NULL) 1569 add_string_option(c, "source-address", certflags_src_addr); 1570 for (i = 0; i < ncert_userext; i++) { 1571 if ((cert_userext[i].crit && (which & OPTIONS_EXTENSIONS)) || 1572 (!cert_userext[i].crit && (which & OPTIONS_CRITICAL))) 1573 continue; 1574 if (cert_userext[i].val == NULL) 1575 add_flag_option(c, cert_userext[i].key); 1576 else { 1577 add_string_option(c, cert_userext[i].key, 1578 cert_userext[i].val); 1579 } 1580 } 1581 } 1582 1583 static struct sshkey * 1584 load_pkcs11_key(char *path) 1585 { 1586 #ifdef ENABLE_PKCS11 1587 struct sshkey **keys = NULL, *public, *private = NULL; 1588 int r, i, nkeys; 1589 1590 if ((r = sshkey_load_public(path, &public, NULL)) != 0) 1591 fatal("Couldn't load CA public key \"%s\": %s", 1592 path, ssh_err(r)); 1593 1594 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys); 1595 debug3("%s: %d keys", __func__, nkeys); 1596 if (nkeys <= 0) 1597 fatal("cannot read public key from pkcs11"); 1598 for (i = 0; i < nkeys; i++) { 1599 if (sshkey_equal_public(public, keys[i])) { 1600 private = keys[i]; 1601 continue; 1602 } 1603 sshkey_free(keys[i]); 1604 } 1605 free(keys); 1606 sshkey_free(public); 1607 return private; 1608 #else 1609 fatal("no pkcs11 support"); 1610 #endif /* ENABLE_PKCS11 */ 1611 } 1612 1613 /* Signer for sshkey_certify_custom that uses the agent */ 1614 static int 1615 agent_signer(const struct sshkey *key, u_char **sigp, size_t *lenp, 1616 const u_char *data, size_t datalen, 1617 const char *alg, u_int compat, void *ctx) 1618 { 1619 int *agent_fdp = (int *)ctx; 1620 1621 return ssh_agent_sign(*agent_fdp, key, sigp, lenp, 1622 data, datalen, alg, compat); 1623 } 1624 1625 static void 1626 do_ca_sign(struct passwd *pw, const char *ca_key_path, int prefer_agent, 1627 unsigned long long cert_serial, int cert_serial_autoinc, 1628 int argc, char **argv) 1629 { 1630 int r, i, fd, found, agent_fd = -1; 1631 u_int n; 1632 struct sshkey *ca, *public; 1633 char valid[64], *otmp, *tmp, *cp, *out, *comment, **plist = NULL; 1634 FILE *f; 1635 struct ssh_identitylist *agent_ids; 1636 size_t j; 1637 1638 #ifdef ENABLE_PKCS11 1639 pkcs11_init(1); 1640 #endif 1641 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1642 if (pkcs11provider != NULL) { 1643 /* If a PKCS#11 token was specified then try to use it */ 1644 if ((ca = load_pkcs11_key(tmp)) == NULL) 1645 fatal("No PKCS#11 key matching %s found", ca_key_path); 1646 } else if (prefer_agent) { 1647 /* 1648 * Agent signature requested. Try to use agent after making 1649 * sure the public key specified is actually present in the 1650 * agent. 1651 */ 1652 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 1653 fatal("Cannot load CA public key %s: %s", 1654 tmp, ssh_err(r)); 1655 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 1656 fatal("Cannot use public key for CA signature: %s", 1657 ssh_err(r)); 1658 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0) 1659 fatal("Retrieve agent key list: %s", ssh_err(r)); 1660 found = 0; 1661 for (j = 0; j < agent_ids->nkeys; j++) { 1662 if (sshkey_equal(ca, agent_ids->keys[j])) { 1663 found = 1; 1664 break; 1665 } 1666 } 1667 if (!found) 1668 fatal("CA key %s not found in agent", tmp); 1669 ssh_free_identitylist(agent_ids); 1670 ca->flags |= SSHKEY_FLAG_EXT; 1671 } else { 1672 /* CA key is assumed to be a private key on the filesystem */ 1673 ca = load_identity(tmp); 1674 } 1675 free(tmp); 1676 1677 if (key_type_name != NULL && 1678 sshkey_type_from_name(key_type_name) != ca->type) { 1679 fatal("CA key type %s doesn't match specified %s", 1680 sshkey_ssh_name(ca), key_type_name); 1681 } 1682 1683 for (i = 0; i < argc; i++) { 1684 /* Split list of principals */ 1685 n = 0; 1686 if (cert_principals != NULL) { 1687 otmp = tmp = xstrdup(cert_principals); 1688 plist = NULL; 1689 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1690 plist = xreallocarray(plist, n + 1, sizeof(*plist)); 1691 if (*(plist[n] = xstrdup(cp)) == '\0') 1692 fatal("Empty principal name"); 1693 } 1694 free(otmp); 1695 } 1696 if (n > SSHKEY_CERT_MAX_PRINCIPALS) 1697 fatal("Too many certificate principals specified"); 1698 1699 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1700 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0) 1701 fatal("%s: unable to open \"%s\": %s", 1702 __func__, tmp, ssh_err(r)); 1703 if (public->type != KEY_RSA && public->type != KEY_DSA && 1704 public->type != KEY_ECDSA && public->type != KEY_ED25519 && 1705 public->type != KEY_XMSS) 1706 fatal("%s: key \"%s\" type %s cannot be certified", 1707 __func__, tmp, sshkey_type(public)); 1708 1709 /* Prepare certificate to sign */ 1710 if ((r = sshkey_to_certified(public)) != 0) 1711 fatal("Could not upgrade key %s to certificate: %s", 1712 tmp, ssh_err(r)); 1713 public->cert->type = cert_key_type; 1714 public->cert->serial = (u_int64_t)cert_serial; 1715 public->cert->key_id = xstrdup(cert_key_id); 1716 public->cert->nprincipals = n; 1717 public->cert->principals = plist; 1718 public->cert->valid_after = cert_valid_from; 1719 public->cert->valid_before = cert_valid_to; 1720 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL); 1721 prepare_options_buf(public->cert->extensions, 1722 OPTIONS_EXTENSIONS); 1723 if ((r = sshkey_from_private(ca, 1724 &public->cert->signature_key)) != 0) 1725 fatal("sshkey_from_private (ca key): %s", ssh_err(r)); 1726 1727 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) { 1728 if ((r = sshkey_certify_custom(public, ca, 1729 key_type_name, agent_signer, &agent_fd)) != 0) 1730 fatal("Couldn't certify key %s via agent: %s", 1731 tmp, ssh_err(r)); 1732 } else { 1733 if ((sshkey_certify(public, ca, key_type_name)) != 0) 1734 fatal("Couldn't certify key %s: %s", 1735 tmp, ssh_err(r)); 1736 } 1737 1738 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1739 *cp = '\0'; 1740 xasprintf(&out, "%s-cert.pub", tmp); 1741 free(tmp); 1742 1743 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1744 fatal("Could not open \"%s\" for writing: %s", out, 1745 strerror(errno)); 1746 if ((f = fdopen(fd, "w")) == NULL) 1747 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1748 if ((r = sshkey_write(public, f)) != 0) 1749 fatal("Could not write certified key to %s: %s", 1750 out, ssh_err(r)); 1751 fprintf(f, " %s\n", comment); 1752 fclose(f); 1753 1754 if (!quiet) { 1755 sshkey_format_cert_validity(public->cert, 1756 valid, sizeof(valid)); 1757 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1758 "valid %s", sshkey_cert_type(public), 1759 out, public->cert->key_id, 1760 (unsigned long long)public->cert->serial, 1761 cert_principals != NULL ? " for " : "", 1762 cert_principals != NULL ? cert_principals : "", 1763 valid); 1764 } 1765 1766 sshkey_free(public); 1767 free(out); 1768 if (cert_serial_autoinc) 1769 cert_serial++; 1770 } 1771 #ifdef ENABLE_PKCS11 1772 pkcs11_terminate(); 1773 #endif 1774 exit(0); 1775 } 1776 1777 static u_int64_t 1778 parse_relative_time(const char *s, time_t now) 1779 { 1780 int64_t mul, secs; 1781 1782 mul = *s == '-' ? -1 : 1; 1783 1784 if ((secs = convtime(s + 1)) == -1) 1785 fatal("Invalid relative certificate time %s", s); 1786 if (mul == -1 && secs > now) 1787 fatal("Certificate time %s cannot be represented", s); 1788 return now + (u_int64_t)(secs * mul); 1789 } 1790 1791 static void 1792 parse_cert_times(char *timespec) 1793 { 1794 char *from, *to; 1795 time_t now = time(NULL); 1796 int64_t secs; 1797 1798 /* +timespec relative to now */ 1799 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1800 if ((secs = convtime(timespec + 1)) == -1) 1801 fatal("Invalid relative certificate life %s", timespec); 1802 cert_valid_to = now + secs; 1803 /* 1804 * Backdate certificate one minute to avoid problems on hosts 1805 * with poorly-synchronised clocks. 1806 */ 1807 cert_valid_from = ((now - 59)/ 60) * 60; 1808 return; 1809 } 1810 1811 /* 1812 * from:to, where 1813 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "always" 1814 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "forever" 1815 */ 1816 from = xstrdup(timespec); 1817 to = strchr(from, ':'); 1818 if (to == NULL || from == to || *(to + 1) == '\0') 1819 fatal("Invalid certificate life specification %s", timespec); 1820 *to++ = '\0'; 1821 1822 if (*from == '-' || *from == '+') 1823 cert_valid_from = parse_relative_time(from, now); 1824 else if (strcmp(from, "always") == 0) 1825 cert_valid_from = 0; 1826 else if (parse_absolute_time(from, &cert_valid_from) != 0) 1827 fatal("Invalid from time \"%s\"", from); 1828 1829 if (*to == '-' || *to == '+') 1830 cert_valid_to = parse_relative_time(to, now); 1831 else if (strcmp(to, "forever") == 0) 1832 cert_valid_to = ~(u_int64_t)0; 1833 else if (parse_absolute_time(to, &cert_valid_to) != 0) 1834 fatal("Invalid to time \"%s\"", to); 1835 1836 if (cert_valid_to <= cert_valid_from) 1837 fatal("Empty certificate validity interval"); 1838 free(from); 1839 } 1840 1841 static void 1842 add_cert_option(char *opt) 1843 { 1844 char *val, *cp; 1845 int iscrit = 0; 1846 1847 if (strcasecmp(opt, "clear") == 0) 1848 certflags_flags = 0; 1849 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1850 certflags_flags &= ~CERTOPT_X_FWD; 1851 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1852 certflags_flags |= CERTOPT_X_FWD; 1853 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1854 certflags_flags &= ~CERTOPT_AGENT_FWD; 1855 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1856 certflags_flags |= CERTOPT_AGENT_FWD; 1857 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1858 certflags_flags &= ~CERTOPT_PORT_FWD; 1859 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1860 certflags_flags |= CERTOPT_PORT_FWD; 1861 else if (strcasecmp(opt, "no-pty") == 0) 1862 certflags_flags &= ~CERTOPT_PTY; 1863 else if (strcasecmp(opt, "permit-pty") == 0) 1864 certflags_flags |= CERTOPT_PTY; 1865 else if (strcasecmp(opt, "no-user-rc") == 0) 1866 certflags_flags &= ~CERTOPT_USER_RC; 1867 else if (strcasecmp(opt, "permit-user-rc") == 0) 1868 certflags_flags |= CERTOPT_USER_RC; 1869 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1870 val = opt + 14; 1871 if (*val == '\0') 1872 fatal("Empty force-command option"); 1873 if (certflags_command != NULL) 1874 fatal("force-command already specified"); 1875 certflags_command = xstrdup(val); 1876 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1877 val = opt + 15; 1878 if (*val == '\0') 1879 fatal("Empty source-address option"); 1880 if (certflags_src_addr != NULL) 1881 fatal("source-address already specified"); 1882 if (addr_match_cidr_list(NULL, val) != 0) 1883 fatal("Invalid source-address list"); 1884 certflags_src_addr = xstrdup(val); 1885 } else if (strncasecmp(opt, "extension:", 10) == 0 || 1886 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) { 1887 val = xstrdup(strchr(opt, ':') + 1); 1888 if ((cp = strchr(val, '=')) != NULL) 1889 *cp++ = '\0'; 1890 cert_userext = xreallocarray(cert_userext, ncert_userext + 1, 1891 sizeof(*cert_userext)); 1892 cert_userext[ncert_userext].key = val; 1893 cert_userext[ncert_userext].val = cp == NULL ? 1894 NULL : xstrdup(cp); 1895 cert_userext[ncert_userext].crit = iscrit; 1896 ncert_userext++; 1897 } else 1898 fatal("Unsupported certificate option \"%s\"", opt); 1899 } 1900 1901 static void 1902 show_options(struct sshbuf *optbuf, int in_critical) 1903 { 1904 char *name, *arg; 1905 struct sshbuf *options, *option = NULL; 1906 int r; 1907 1908 if ((options = sshbuf_fromb(optbuf)) == NULL) 1909 fatal("%s: sshbuf_fromb failed", __func__); 1910 while (sshbuf_len(options) != 0) { 1911 sshbuf_free(option); 1912 option = NULL; 1913 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 || 1914 (r = sshbuf_froms(options, &option)) != 0) 1915 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1916 printf(" %s", name); 1917 if (!in_critical && 1918 (strcmp(name, "permit-X11-forwarding") == 0 || 1919 strcmp(name, "permit-agent-forwarding") == 0 || 1920 strcmp(name, "permit-port-forwarding") == 0 || 1921 strcmp(name, "permit-pty") == 0 || 1922 strcmp(name, "permit-user-rc") == 0)) 1923 printf("\n"); 1924 else if (in_critical && 1925 (strcmp(name, "force-command") == 0 || 1926 strcmp(name, "source-address") == 0)) { 1927 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0) 1928 fatal("%s: buffer error: %s", 1929 __func__, ssh_err(r)); 1930 printf(" %s\n", arg); 1931 free(arg); 1932 } else { 1933 printf(" UNKNOWN OPTION (len %zu)\n", 1934 sshbuf_len(option)); 1935 sshbuf_reset(option); 1936 } 1937 free(name); 1938 if (sshbuf_len(option) != 0) 1939 fatal("Option corrupt: extra data at end"); 1940 } 1941 sshbuf_free(option); 1942 sshbuf_free(options); 1943 } 1944 1945 static void 1946 print_cert(struct sshkey *key) 1947 { 1948 char valid[64], *key_fp, *ca_fp; 1949 u_int i; 1950 1951 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT); 1952 ca_fp = sshkey_fingerprint(key->cert->signature_key, 1953 fingerprint_hash, SSH_FP_DEFAULT); 1954 if (key_fp == NULL || ca_fp == NULL) 1955 fatal("%s: sshkey_fingerprint fail", __func__); 1956 sshkey_format_cert_validity(key->cert, valid, sizeof(valid)); 1957 1958 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key), 1959 sshkey_cert_type(key)); 1960 printf(" Public key: %s %s\n", sshkey_type(key), key_fp); 1961 printf(" Signing CA: %s %s (using %s)\n", 1962 sshkey_type(key->cert->signature_key), ca_fp, 1963 key->cert->signature_type); 1964 printf(" Key ID: \"%s\"\n", key->cert->key_id); 1965 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial); 1966 printf(" Valid: %s\n", valid); 1967 printf(" Principals: "); 1968 if (key->cert->nprincipals == 0) 1969 printf("(none)\n"); 1970 else { 1971 for (i = 0; i < key->cert->nprincipals; i++) 1972 printf("\n %s", 1973 key->cert->principals[i]); 1974 printf("\n"); 1975 } 1976 printf(" Critical Options: "); 1977 if (sshbuf_len(key->cert->critical) == 0) 1978 printf("(none)\n"); 1979 else { 1980 printf("\n"); 1981 show_options(key->cert->critical, 1); 1982 } 1983 printf(" Extensions: "); 1984 if (sshbuf_len(key->cert->extensions) == 0) 1985 printf("(none)\n"); 1986 else { 1987 printf("\n"); 1988 show_options(key->cert->extensions, 0); 1989 } 1990 } 1991 1992 static void 1993 do_show_cert(struct passwd *pw) 1994 { 1995 struct sshkey *key = NULL; 1996 struct stat st; 1997 int r, is_stdin = 0, ok = 0; 1998 FILE *f; 1999 char *cp, *line = NULL; 2000 const char *path; 2001 size_t linesize = 0; 2002 u_long lnum = 0; 2003 2004 if (!have_identity) 2005 ask_filename(pw, "Enter file in which the key is"); 2006 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) < 0) 2007 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 2008 2009 path = identity_file; 2010 if (strcmp(path, "-") == 0) { 2011 f = stdin; 2012 path = "(stdin)"; 2013 is_stdin = 1; 2014 } else if ((f = fopen(identity_file, "r")) == NULL) 2015 fatal("fopen %s: %s", identity_file, strerror(errno)); 2016 2017 while (getline(&line, &linesize, f) != -1) { 2018 lnum++; 2019 sshkey_free(key); 2020 key = NULL; 2021 /* Trim leading space and comments */ 2022 cp = line + strspn(line, " \t"); 2023 if (*cp == '#' || *cp == '\0') 2024 continue; 2025 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2026 fatal("sshkey_new"); 2027 if ((r = sshkey_read(key, &cp)) != 0) { 2028 error("%s:%lu: invalid key: %s", path, 2029 lnum, ssh_err(r)); 2030 continue; 2031 } 2032 if (!sshkey_is_cert(key)) { 2033 error("%s:%lu is not a certificate", path, lnum); 2034 continue; 2035 } 2036 ok = 1; 2037 if (!is_stdin && lnum == 1) 2038 printf("%s:\n", path); 2039 else 2040 printf("%s:%lu:\n", path, lnum); 2041 print_cert(key); 2042 } 2043 free(line); 2044 sshkey_free(key); 2045 fclose(f); 2046 exit(ok ? 0 : 1); 2047 } 2048 2049 #ifdef WITH_OPENSSL 2050 static void 2051 load_krl(const char *path, struct ssh_krl **krlp) 2052 { 2053 struct sshbuf *krlbuf; 2054 int r, fd; 2055 2056 if ((krlbuf = sshbuf_new()) == NULL) 2057 fatal("sshbuf_new failed"); 2058 if ((fd = open(path, O_RDONLY)) == -1) 2059 fatal("open %s: %s", path, strerror(errno)); 2060 if ((r = sshkey_load_file(fd, krlbuf)) != 0) 2061 fatal("Unable to load KRL: %s", ssh_err(r)); 2062 close(fd); 2063 /* XXX check sigs */ 2064 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 || 2065 *krlp == NULL) 2066 fatal("Invalid KRL file: %s", ssh_err(r)); 2067 sshbuf_free(krlbuf); 2068 } 2069 2070 static void 2071 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp, 2072 const char *file, u_long lnum) 2073 { 2074 char *tmp; 2075 size_t tlen; 2076 struct sshbuf *b; 2077 int r; 2078 2079 if (strncmp(cp, "SHA256:", 7) != 0) 2080 fatal("%s:%lu: unsupported hash algorithm", file, lnum); 2081 cp += 7; 2082 2083 /* 2084 * OpenSSH base64 hashes omit trailing '=' 2085 * characters; put them back for decode. 2086 */ 2087 tlen = strlen(cp); 2088 tmp = xmalloc(tlen + 4 + 1); 2089 strlcpy(tmp, cp, tlen + 1); 2090 while ((tlen % 4) != 0) { 2091 tmp[tlen++] = '='; 2092 tmp[tlen] = '\0'; 2093 } 2094 if ((b = sshbuf_new()) == NULL) 2095 fatal("%s: sshbuf_new failed", __func__); 2096 if ((r = sshbuf_b64tod(b, tmp)) != 0) 2097 fatal("%s:%lu: decode hash failed: %s", file, lnum, ssh_err(r)); 2098 free(tmp); 2099 *lenp = sshbuf_len(b); 2100 *blobp = xmalloc(*lenp); 2101 memcpy(*blobp, sshbuf_ptr(b), *lenp); 2102 sshbuf_free(b); 2103 } 2104 2105 static void 2106 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca, 2107 const struct sshkey *ca, struct ssh_krl *krl) 2108 { 2109 struct sshkey *key = NULL; 2110 u_long lnum = 0; 2111 char *path, *cp, *ep, *line = NULL; 2112 u_char *blob = NULL; 2113 size_t blen = 0, linesize = 0; 2114 unsigned long long serial, serial2; 2115 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r; 2116 FILE *krl_spec; 2117 2118 path = tilde_expand_filename(file, pw->pw_uid); 2119 if (strcmp(path, "-") == 0) { 2120 krl_spec = stdin; 2121 free(path); 2122 path = xstrdup("(standard input)"); 2123 } else if ((krl_spec = fopen(path, "r")) == NULL) 2124 fatal("fopen %s: %s", path, strerror(errno)); 2125 2126 if (!quiet) 2127 printf("Revoking from %s\n", path); 2128 while (getline(&line, &linesize, krl_spec) != -1) { 2129 lnum++; 2130 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0; 2131 cp = line + strspn(line, " \t"); 2132 /* Trim trailing space, comments and strip \n */ 2133 for (i = 0, r = -1; cp[i] != '\0'; i++) { 2134 if (cp[i] == '#' || cp[i] == '\n') { 2135 cp[i] = '\0'; 2136 break; 2137 } 2138 if (cp[i] == ' ' || cp[i] == '\t') { 2139 /* Remember the start of a span of whitespace */ 2140 if (r == -1) 2141 r = i; 2142 } else 2143 r = -1; 2144 } 2145 if (r != -1) 2146 cp[r] = '\0'; 2147 if (*cp == '\0') 2148 continue; 2149 if (strncasecmp(cp, "serial:", 7) == 0) { 2150 if (ca == NULL && !wild_ca) { 2151 fatal("revoking certificates by serial number " 2152 "requires specification of a CA key"); 2153 } 2154 cp += 7; 2155 cp = cp + strspn(cp, " \t"); 2156 errno = 0; 2157 serial = strtoull(cp, &ep, 0); 2158 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 2159 fatal("%s:%lu: invalid serial \"%s\"", 2160 path, lnum, cp); 2161 if (errno == ERANGE && serial == ULLONG_MAX) 2162 fatal("%s:%lu: serial out of range", 2163 path, lnum); 2164 serial2 = serial; 2165 if (*ep == '-') { 2166 cp = ep + 1; 2167 errno = 0; 2168 serial2 = strtoull(cp, &ep, 0); 2169 if (*cp == '\0' || *ep != '\0') 2170 fatal("%s:%lu: invalid serial \"%s\"", 2171 path, lnum, cp); 2172 if (errno == ERANGE && serial2 == ULLONG_MAX) 2173 fatal("%s:%lu: serial out of range", 2174 path, lnum); 2175 if (serial2 <= serial) 2176 fatal("%s:%lu: invalid serial range " 2177 "%llu:%llu", path, lnum, 2178 (unsigned long long)serial, 2179 (unsigned long long)serial2); 2180 } 2181 if (ssh_krl_revoke_cert_by_serial_range(krl, 2182 ca, serial, serial2) != 0) { 2183 fatal("%s: revoke serial failed", 2184 __func__); 2185 } 2186 } else if (strncasecmp(cp, "id:", 3) == 0) { 2187 if (ca == NULL && !wild_ca) { 2188 fatal("revoking certificates by key ID " 2189 "requires specification of a CA key"); 2190 } 2191 cp += 3; 2192 cp = cp + strspn(cp, " \t"); 2193 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2194 fatal("%s: revoke key ID failed", __func__); 2195 } else if (strncasecmp(cp, "hash:", 5) == 0) { 2196 cp += 5; 2197 cp = cp + strspn(cp, " \t"); 2198 hash_to_blob(cp, &blob, &blen, file, lnum); 2199 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2200 } else { 2201 if (strncasecmp(cp, "key:", 4) == 0) { 2202 cp += 4; 2203 cp = cp + strspn(cp, " \t"); 2204 was_explicit_key = 1; 2205 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2206 cp += 5; 2207 cp = cp + strspn(cp, " \t"); 2208 was_sha1 = 1; 2209 } else if (strncasecmp(cp, "sha256:", 7) == 0) { 2210 cp += 7; 2211 cp = cp + strspn(cp, " \t"); 2212 was_sha256 = 1; 2213 /* 2214 * Just try to process the line as a key. 2215 * Parsing will fail if it isn't. 2216 */ 2217 } 2218 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2219 fatal("sshkey_new"); 2220 if ((r = sshkey_read(key, &cp)) != 0) 2221 fatal("%s:%lu: invalid key: %s", 2222 path, lnum, ssh_err(r)); 2223 if (was_explicit_key) 2224 r = ssh_krl_revoke_key_explicit(krl, key); 2225 else if (was_sha1) { 2226 if (sshkey_fingerprint_raw(key, 2227 SSH_DIGEST_SHA1, &blob, &blen) != 0) { 2228 fatal("%s:%lu: fingerprint failed", 2229 file, lnum); 2230 } 2231 r = ssh_krl_revoke_key_sha1(krl, blob, blen); 2232 } else if (was_sha256) { 2233 if (sshkey_fingerprint_raw(key, 2234 SSH_DIGEST_SHA256, &blob, &blen) != 0) { 2235 fatal("%s:%lu: fingerprint failed", 2236 file, lnum); 2237 } 2238 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2239 } else 2240 r = ssh_krl_revoke_key(krl, key); 2241 if (r != 0) 2242 fatal("%s: revoke key failed: %s", 2243 __func__, ssh_err(r)); 2244 freezero(blob, blen); 2245 blob = NULL; 2246 blen = 0; 2247 sshkey_free(key); 2248 } 2249 } 2250 if (strcmp(path, "-") != 0) 2251 fclose(krl_spec); 2252 free(line); 2253 free(path); 2254 } 2255 2256 static void 2257 do_gen_krl(struct passwd *pw, int updating, const char *ca_key_path, 2258 unsigned long long krl_version, const char *krl_comment, 2259 int argc, char **argv) 2260 { 2261 struct ssh_krl *krl; 2262 struct stat sb; 2263 struct sshkey *ca = NULL; 2264 int fd, i, r, wild_ca = 0; 2265 char *tmp; 2266 struct sshbuf *kbuf; 2267 2268 if (*identity_file == '\0') 2269 fatal("KRL generation requires an output file"); 2270 if (stat(identity_file, &sb) == -1) { 2271 if (errno != ENOENT) 2272 fatal("Cannot access KRL \"%s\": %s", 2273 identity_file, strerror(errno)); 2274 if (updating) 2275 fatal("KRL \"%s\" does not exist", identity_file); 2276 } 2277 if (ca_key_path != NULL) { 2278 if (strcasecmp(ca_key_path, "none") == 0) 2279 wild_ca = 1; 2280 else { 2281 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2282 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 2283 fatal("Cannot load CA public key %s: %s", 2284 tmp, ssh_err(r)); 2285 free(tmp); 2286 } 2287 } 2288 2289 if (updating) 2290 load_krl(identity_file, &krl); 2291 else if ((krl = ssh_krl_init()) == NULL) 2292 fatal("couldn't create KRL"); 2293 2294 if (krl_version != 0) 2295 ssh_krl_set_version(krl, krl_version); 2296 if (krl_comment != NULL) 2297 ssh_krl_set_comment(krl, krl_comment); 2298 2299 for (i = 0; i < argc; i++) 2300 update_krl_from_file(pw, argv[i], wild_ca, ca, krl); 2301 2302 if ((kbuf = sshbuf_new()) == NULL) 2303 fatal("sshbuf_new failed"); 2304 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0) 2305 fatal("Couldn't generate KRL"); 2306 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2307 fatal("open %s: %s", identity_file, strerror(errno)); 2308 if (atomicio(vwrite, fd, sshbuf_mutable_ptr(kbuf), sshbuf_len(kbuf)) != 2309 sshbuf_len(kbuf)) 2310 fatal("write %s: %s", identity_file, strerror(errno)); 2311 close(fd); 2312 sshbuf_free(kbuf); 2313 ssh_krl_free(krl); 2314 sshkey_free(ca); 2315 } 2316 2317 static void 2318 do_check_krl(struct passwd *pw, int argc, char **argv) 2319 { 2320 int i, r, ret = 0; 2321 char *comment; 2322 struct ssh_krl *krl; 2323 struct sshkey *k; 2324 2325 if (*identity_file == '\0') 2326 fatal("KRL checking requires an input file"); 2327 load_krl(identity_file, &krl); 2328 for (i = 0; i < argc; i++) { 2329 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0) 2330 fatal("Cannot load public key %s: %s", 2331 argv[i], ssh_err(r)); 2332 r = ssh_krl_check_key(krl, k); 2333 printf("%s%s%s%s: %s\n", argv[i], 2334 *comment ? " (" : "", comment, *comment ? ")" : "", 2335 r == 0 ? "ok" : "REVOKED"); 2336 if (r != 0) 2337 ret = 1; 2338 sshkey_free(k); 2339 free(comment); 2340 } 2341 ssh_krl_free(krl); 2342 exit(ret); 2343 } 2344 #endif 2345 2346 static void 2347 usage(void) 2348 { 2349 fprintf(stderr, 2350 "usage: ssh-keygen [-q] [-b bits] [-t dsa | ecdsa | ed25519 | rsa] [-m format]\n" 2351 " [-N new_passphrase] [-C comment] [-f output_keyfile]\n" 2352 " ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-m format]\n" 2353 " [-f keyfile]\n" 2354 " ssh-keygen -i [-m key_format] [-f input_keyfile]\n" 2355 " ssh-keygen -e [-m key_format] [-f input_keyfile]\n" 2356 " ssh-keygen -y [-f input_keyfile]\n" 2357 " ssh-keygen -c [-P passphrase] [-C comment] [-f keyfile]\n" 2358 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n" 2359 " ssh-keygen -B [-f input_keyfile]\n"); 2360 #ifdef ENABLE_PKCS11 2361 fprintf(stderr, 2362 " ssh-keygen -D pkcs11\n"); 2363 #endif 2364 fprintf(stderr, 2365 " ssh-keygen -F hostname [-f known_hosts_file] [-l]\n" 2366 " ssh-keygen -H [-f known_hosts_file]\n" 2367 " ssh-keygen -R hostname [-f known_hosts_file]\n" 2368 " ssh-keygen -r hostname [-f input_keyfile] [-g]\n" 2369 #ifdef WITH_OPENSSL 2370 " ssh-keygen -G output_file [-v] [-b bits] [-M memory] [-S start_point]\n" 2371 " ssh-keygen -T output_file -f input_file [-v] [-a rounds] [-J num_lines]\n" 2372 " [-j start_line] [-K checkpt] [-W generator]\n" 2373 #endif 2374 " ssh-keygen -s ca_key -I certificate_identity [-h] [-U]\n" 2375 " [-D pkcs11_provider] [-n principals] [-O option]\n" 2376 " [-V validity_interval] [-z serial_number] file ...\n" 2377 " ssh-keygen -L [-f input_keyfile]\n" 2378 " ssh-keygen -A\n" 2379 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n" 2380 " file ...\n" 2381 " ssh-keygen -Q -f krl_file file ...\n"); 2382 exit(1); 2383 } 2384 2385 /* 2386 * Main program for key management. 2387 */ 2388 int 2389 main(int argc, char **argv) 2390 { 2391 char dotsshdir[PATH_MAX], comment[1024], *passphrase1, *passphrase2; 2392 char *rr_hostname = NULL, *ep, *fp, *ra; 2393 struct sshkey *private, *public; 2394 struct passwd *pw; 2395 struct stat st; 2396 int r, opt, type, fd; 2397 int change_passphrase = 0, change_comment = 0, show_cert = 0; 2398 int find_host = 0, delete_host = 0, hash_hosts = 0; 2399 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 2400 int prefer_agent = 0, convert_to = 0, convert_from = 0; 2401 int print_public = 0, print_generic = 0, cert_serial_autoinc = 0; 2402 unsigned long long cert_serial = 0; 2403 char *identity_comment = NULL, *ca_key_path = NULL; 2404 u_int bits = 0; 2405 FILE *f; 2406 const char *errstr; 2407 int log_level = SYSLOG_LEVEL_INFO; 2408 #ifdef WITH_OPENSSL 2409 /* Moduli generation/screening */ 2410 char out_file[PATH_MAX], *checkpoint = NULL; 2411 u_int32_t memory = 0, generator_wanted = 0; 2412 int do_gen_candidates = 0, do_screen_candidates = 0; 2413 unsigned long start_lineno = 0, lines_to_process = 0; 2414 BIGNUM *start = NULL; 2415 #endif 2416 2417 extern int optind; 2418 extern char *optarg; 2419 2420 ssh_malloc_init(); /* must be called before any mallocs */ 2421 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 2422 sanitise_stdfd(); 2423 2424 OpenSSL_add_all_algorithms(); 2425 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 2426 2427 setlocale(LC_CTYPE, ""); 2428 2429 /* we need this for the home * directory. */ 2430 pw = getpwuid(getuid()); 2431 if (!pw) 2432 fatal("No user exists for uid %lu", (u_long)getuid()); 2433 if (gethostname(hostname, sizeof(hostname)) < 0) 2434 fatal("gethostname: %s", strerror(errno)); 2435 2436 /* Remaining characters: Ydw */ 2437 while ((opt = getopt(argc, argv, "ABHLQUXceghiklopquvxy" 2438 "C:D:E:F:G:I:J:K:M:N:O:P:R:S:T:V:W:Z:" 2439 "a:b:f:g:j:m:n:r:s:t:z:")) != -1) { 2440 switch (opt) { 2441 case 'A': 2442 gen_all_hostkeys = 1; 2443 break; 2444 case 'b': 2445 bits = (u_int32_t)strtonum(optarg, 10, 32768, &errstr); 2446 if (errstr) 2447 fatal("Bits has bad value %s (%s)", 2448 optarg, errstr); 2449 break; 2450 case 'E': 2451 fingerprint_hash = ssh_digest_alg_by_name(optarg); 2452 if (fingerprint_hash == -1) 2453 fatal("Invalid hash algorithm \"%s\"", optarg); 2454 break; 2455 case 'F': 2456 find_host = 1; 2457 rr_hostname = optarg; 2458 break; 2459 case 'H': 2460 hash_hosts = 1; 2461 break; 2462 case 'I': 2463 cert_key_id = optarg; 2464 break; 2465 case 'R': 2466 delete_host = 1; 2467 rr_hostname = optarg; 2468 break; 2469 case 'L': 2470 show_cert = 1; 2471 break; 2472 case 'l': 2473 print_fingerprint = 1; 2474 break; 2475 case 'B': 2476 print_bubblebabble = 1; 2477 break; 2478 case 'm': 2479 if (strcasecmp(optarg, "RFC4716") == 0 || 2480 strcasecmp(optarg, "ssh2") == 0) { 2481 convert_format = FMT_RFC4716; 2482 break; 2483 } 2484 if (strcasecmp(optarg, "PKCS8") == 0) { 2485 convert_format = FMT_PKCS8; 2486 break; 2487 } 2488 if (strcasecmp(optarg, "PEM") == 0) { 2489 convert_format = FMT_PEM; 2490 use_new_format = 0; 2491 break; 2492 } 2493 fatal("Unsupported conversion format \"%s\"", optarg); 2494 case 'n': 2495 cert_principals = optarg; 2496 break; 2497 case 'o': 2498 /* no-op; new format is already the default */ 2499 break; 2500 case 'p': 2501 change_passphrase = 1; 2502 break; 2503 case 'c': 2504 change_comment = 1; 2505 break; 2506 case 'f': 2507 if (strlcpy(identity_file, optarg, 2508 sizeof(identity_file)) >= sizeof(identity_file)) 2509 fatal("Identity filename too long"); 2510 have_identity = 1; 2511 break; 2512 case 'g': 2513 print_generic = 1; 2514 break; 2515 case 'P': 2516 identity_passphrase = optarg; 2517 break; 2518 case 'N': 2519 identity_new_passphrase = optarg; 2520 break; 2521 case 'Q': 2522 check_krl = 1; 2523 break; 2524 case 'O': 2525 add_cert_option(optarg); 2526 break; 2527 case 'Z': 2528 new_format_cipher = optarg; 2529 break; 2530 case 'C': 2531 identity_comment = optarg; 2532 break; 2533 case 'q': 2534 quiet = 1; 2535 break; 2536 case 'e': 2537 case 'x': 2538 /* export key */ 2539 convert_to = 1; 2540 break; 2541 case 'h': 2542 cert_key_type = SSH2_CERT_TYPE_HOST; 2543 certflags_flags = 0; 2544 break; 2545 case 'k': 2546 gen_krl = 1; 2547 break; 2548 case 'i': 2549 case 'X': 2550 /* import key */ 2551 convert_from = 1; 2552 break; 2553 case 'y': 2554 print_public = 1; 2555 break; 2556 case 's': 2557 ca_key_path = optarg; 2558 break; 2559 case 't': 2560 key_type_name = optarg; 2561 break; 2562 case 'D': 2563 pkcs11provider = optarg; 2564 break; 2565 case 'U': 2566 prefer_agent = 1; 2567 break; 2568 case 'u': 2569 update_krl = 1; 2570 break; 2571 case 'v': 2572 if (log_level == SYSLOG_LEVEL_INFO) 2573 log_level = SYSLOG_LEVEL_DEBUG1; 2574 else { 2575 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 2576 log_level < SYSLOG_LEVEL_DEBUG3) 2577 log_level++; 2578 } 2579 break; 2580 case 'r': 2581 rr_hostname = optarg; 2582 break; 2583 case 'a': 2584 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr); 2585 if (errstr) 2586 fatal("Invalid number: %s (%s)", 2587 optarg, errstr); 2588 break; 2589 case 'V': 2590 parse_cert_times(optarg); 2591 break; 2592 case 'z': 2593 errno = 0; 2594 if (*optarg == '+') { 2595 cert_serial_autoinc = 1; 2596 optarg++; 2597 } 2598 cert_serial = strtoull(optarg, &ep, 10); 2599 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 2600 (errno == ERANGE && cert_serial == ULLONG_MAX)) 2601 fatal("Invalid serial number \"%s\"", optarg); 2602 break; 2603 #ifdef WITH_OPENSSL 2604 /* Moduli generation/screening */ 2605 case 'G': 2606 do_gen_candidates = 1; 2607 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2608 sizeof(out_file)) 2609 fatal("Output filename too long"); 2610 break; 2611 case 'J': 2612 lines_to_process = strtoul(optarg, NULL, 10); 2613 break; 2614 case 'j': 2615 start_lineno = strtoul(optarg, NULL, 10); 2616 break; 2617 case 'K': 2618 if (strlen(optarg) >= PATH_MAX) 2619 fatal("Checkpoint filename too long"); 2620 checkpoint = xstrdup(optarg); 2621 break; 2622 case 'M': 2623 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, 2624 &errstr); 2625 if (errstr) 2626 fatal("Memory limit is %s: %s", errstr, optarg); 2627 break; 2628 case 'S': 2629 /* XXX - also compare length against bits */ 2630 if (BN_hex2bn(&start, optarg) == 0) 2631 fatal("Invalid start point."); 2632 break; 2633 case 'T': 2634 do_screen_candidates = 1; 2635 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 2636 sizeof(out_file)) 2637 fatal("Output filename too long"); 2638 break; 2639 case 'W': 2640 generator_wanted = (u_int32_t)strtonum(optarg, 1, 2641 UINT_MAX, &errstr); 2642 if (errstr != NULL) 2643 fatal("Desired generator invalid: %s (%s)", 2644 optarg, errstr); 2645 break; 2646 #endif /* WITH_OPENSSL */ 2647 case '?': 2648 default: 2649 usage(); 2650 } 2651 } 2652 2653 /* reinit */ 2654 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 2655 2656 argv += optind; 2657 argc -= optind; 2658 2659 if (ca_key_path != NULL) { 2660 if (argc < 1 && !gen_krl) { 2661 error("Too few arguments."); 2662 usage(); 2663 } 2664 } else if (argc > 0 && !gen_krl && !check_krl) { 2665 error("Too many arguments."); 2666 usage(); 2667 } 2668 if (change_passphrase && change_comment) { 2669 error("Can only have one of -p and -c."); 2670 usage(); 2671 } 2672 if (print_fingerprint && (delete_host || hash_hosts)) { 2673 error("Cannot use -l with -H or -R."); 2674 usage(); 2675 } 2676 #ifdef WITH_OPENSSL 2677 if (gen_krl) { 2678 do_gen_krl(pw, update_krl, ca_key_path, 2679 cert_serial, identity_comment, argc, argv); 2680 return (0); 2681 } 2682 if (check_krl) { 2683 do_check_krl(pw, argc, argv); 2684 return (0); 2685 } 2686 #endif 2687 if (ca_key_path != NULL) { 2688 if (cert_key_id == NULL) 2689 fatal("Must specify key id (-I) when certifying"); 2690 do_ca_sign(pw, ca_key_path, prefer_agent, 2691 cert_serial, cert_serial_autoinc, argc, argv); 2692 } 2693 if (show_cert) 2694 do_show_cert(pw); 2695 if (delete_host || hash_hosts || find_host) { 2696 do_known_hosts(pw, rr_hostname, find_host, 2697 delete_host, hash_hosts); 2698 } 2699 if (pkcs11provider != NULL) 2700 do_download(pw); 2701 if (print_fingerprint || print_bubblebabble) 2702 do_fingerprint(pw); 2703 if (change_passphrase) 2704 do_change_passphrase(pw); 2705 if (change_comment) 2706 do_change_comment(pw, identity_comment); 2707 #ifdef WITH_OPENSSL 2708 if (convert_to) 2709 do_convert_to(pw); 2710 if (convert_from) 2711 do_convert_from(pw); 2712 #endif 2713 if (print_public) 2714 do_print_public(pw); 2715 if (rr_hostname != NULL) { 2716 unsigned int n = 0; 2717 2718 if (have_identity) { 2719 n = do_print_resource_record(pw, identity_file, 2720 rr_hostname, print_generic); 2721 if (n == 0) 2722 fatal("%s: %s", identity_file, strerror(errno)); 2723 exit(0); 2724 } else { 2725 2726 n += do_print_resource_record(pw, 2727 _PATH_HOST_RSA_KEY_FILE, rr_hostname, 2728 print_generic); 2729 n += do_print_resource_record(pw, 2730 _PATH_HOST_DSA_KEY_FILE, rr_hostname, 2731 print_generic); 2732 n += do_print_resource_record(pw, 2733 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname, 2734 print_generic); 2735 n += do_print_resource_record(pw, 2736 _PATH_HOST_ED25519_KEY_FILE, rr_hostname, 2737 print_generic); 2738 n += do_print_resource_record(pw, 2739 _PATH_HOST_XMSS_KEY_FILE, rr_hostname, 2740 print_generic); 2741 if (n == 0) 2742 fatal("no keys found."); 2743 exit(0); 2744 } 2745 } 2746 2747 #ifdef WITH_OPENSSL 2748 if (do_gen_candidates) { 2749 FILE *out = fopen(out_file, "w"); 2750 2751 if (out == NULL) { 2752 error("Couldn't open modulus candidate file \"%s\": %s", 2753 out_file, strerror(errno)); 2754 return (1); 2755 } 2756 if (bits == 0) 2757 bits = DEFAULT_BITS; 2758 if (gen_candidates(out, memory, bits, start) != 0) 2759 fatal("modulus candidate generation failed"); 2760 2761 return (0); 2762 } 2763 2764 if (do_screen_candidates) { 2765 FILE *in; 2766 FILE *out = fopen(out_file, "a"); 2767 2768 if (have_identity && strcmp(identity_file, "-") != 0) { 2769 if ((in = fopen(identity_file, "r")) == NULL) { 2770 fatal("Couldn't open modulus candidate " 2771 "file \"%s\": %s", identity_file, 2772 strerror(errno)); 2773 } 2774 } else 2775 in = stdin; 2776 2777 if (out == NULL) { 2778 fatal("Couldn't open moduli file \"%s\": %s", 2779 out_file, strerror(errno)); 2780 } 2781 if (prime_test(in, out, rounds == 0 ? 100 : rounds, 2782 generator_wanted, checkpoint, 2783 start_lineno, lines_to_process) != 0) 2784 fatal("modulus screening failed"); 2785 return (0); 2786 } 2787 #endif 2788 2789 if (gen_all_hostkeys) { 2790 do_gen_all_hostkeys(pw); 2791 return (0); 2792 } 2793 2794 if (key_type_name == NULL) 2795 key_type_name = DEFAULT_KEY_TYPE_NAME; 2796 2797 type = sshkey_type_from_name(key_type_name); 2798 type_bits_valid(type, key_type_name, &bits); 2799 2800 if (!quiet) 2801 printf("Generating public/private %s key pair.\n", 2802 key_type_name); 2803 if ((r = sshkey_generate(type, bits, &private)) != 0) 2804 fatal("sshkey_generate failed"); 2805 if ((r = sshkey_from_private(private, &public)) != 0) 2806 fatal("sshkey_from_private failed: %s\n", ssh_err(r)); 2807 2808 if (!have_identity) 2809 ask_filename(pw, "Enter file in which to save the key"); 2810 2811 /* Create ~/.ssh directory if it doesn't already exist. */ 2812 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 2813 pw->pw_dir, _PATH_SSH_USER_DIR); 2814 if (strstr(identity_file, dotsshdir) != NULL) { 2815 if (stat(dotsshdir, &st) < 0) { 2816 if (errno != ENOENT) { 2817 error("Could not stat %s: %s", dotsshdir, 2818 strerror(errno)); 2819 } else if (mkdir(dotsshdir, 0700) < 0) { 2820 error("Could not create directory '%s': %s", 2821 dotsshdir, strerror(errno)); 2822 } else if (!quiet) 2823 printf("Created directory '%s'.\n", dotsshdir); 2824 } 2825 } 2826 /* If the file already exists, ask the user to confirm. */ 2827 if (stat(identity_file, &st) >= 0) { 2828 char yesno[3]; 2829 printf("%s already exists.\n", identity_file); 2830 printf("Overwrite (y/n)? "); 2831 fflush(stdout); 2832 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 2833 exit(1); 2834 if (yesno[0] != 'y' && yesno[0] != 'Y') 2835 exit(1); 2836 } 2837 /* Ask for a passphrase (twice). */ 2838 if (identity_passphrase) 2839 passphrase1 = xstrdup(identity_passphrase); 2840 else if (identity_new_passphrase) 2841 passphrase1 = xstrdup(identity_new_passphrase); 2842 else { 2843 passphrase_again: 2844 passphrase1 = 2845 read_passphrase("Enter passphrase (empty for no " 2846 "passphrase): ", RP_ALLOW_STDIN); 2847 passphrase2 = read_passphrase("Enter same passphrase again: ", 2848 RP_ALLOW_STDIN); 2849 if (strcmp(passphrase1, passphrase2) != 0) { 2850 /* 2851 * The passphrases do not match. Clear them and 2852 * retry. 2853 */ 2854 explicit_bzero(passphrase1, strlen(passphrase1)); 2855 explicit_bzero(passphrase2, strlen(passphrase2)); 2856 free(passphrase1); 2857 free(passphrase2); 2858 printf("Passphrases do not match. Try again.\n"); 2859 goto passphrase_again; 2860 } 2861 /* Clear the other copy of the passphrase. */ 2862 explicit_bzero(passphrase2, strlen(passphrase2)); 2863 free(passphrase2); 2864 } 2865 2866 if (identity_comment) { 2867 strlcpy(comment, identity_comment, sizeof(comment)); 2868 } else { 2869 /* Create default comment field for the passphrase. */ 2870 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 2871 } 2872 2873 /* Save the key with the given passphrase and comment. */ 2874 if ((r = sshkey_save_private(private, identity_file, passphrase1, 2875 comment, use_new_format, new_format_cipher, rounds)) != 0) { 2876 error("Saving key \"%s\" failed: %s", 2877 identity_file, ssh_err(r)); 2878 explicit_bzero(passphrase1, strlen(passphrase1)); 2879 free(passphrase1); 2880 exit(1); 2881 } 2882 /* Clear the passphrase. */ 2883 explicit_bzero(passphrase1, strlen(passphrase1)); 2884 free(passphrase1); 2885 2886 /* Clear the private key and the random number generator. */ 2887 sshkey_free(private); 2888 2889 if (!quiet) 2890 printf("Your identification has been saved in %s.\n", identity_file); 2891 2892 strlcat(identity_file, ".pub", sizeof(identity_file)); 2893 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 2894 fatal("Unable to save public key to %s: %s", 2895 identity_file, strerror(errno)); 2896 if ((f = fdopen(fd, "w")) == NULL) 2897 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 2898 if ((r = sshkey_write(public, f)) != 0) 2899 error("write key failed: %s", ssh_err(r)); 2900 fprintf(f, " %s\n", comment); 2901 if (ferror(f) || fclose(f) != 0) 2902 fatal("write public failed: %s", strerror(errno)); 2903 2904 if (!quiet) { 2905 fp = sshkey_fingerprint(public, fingerprint_hash, 2906 SSH_FP_DEFAULT); 2907 ra = sshkey_fingerprint(public, fingerprint_hash, 2908 SSH_FP_RANDOMART); 2909 if (fp == NULL || ra == NULL) 2910 fatal("sshkey_fingerprint failed"); 2911 printf("Your public key has been saved in %s.\n", 2912 identity_file); 2913 printf("The key fingerprint is:\n"); 2914 printf("%s %s\n", fp, comment); 2915 printf("The key's randomart image is:\n"); 2916 printf("%s\n", ra); 2917 free(ra); 2918 free(fp); 2919 } 2920 2921 sshkey_free(public); 2922 exit(0); 2923 } 2924