1 /* $OpenBSD: ssh-keygen.c,v 1.409.2.1 2020/05/18 19:02:13 benno 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 #ifdef HAVE_STDINT_H 28 # include <stdint.h> 29 #endif 30 #include <errno.h> 31 #include <fcntl.h> 32 #include <netdb.h> 33 #ifdef HAVE_PATHS_H 34 # include <paths.h> 35 #endif 36 #include <pwd.h> 37 #include <stdarg.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 #include <limits.h> 43 #include <locale.h> 44 #include <time.h> 45 46 #include "xmalloc.h" 47 #include "sshkey.h" 48 #include "authfile.h" 49 #include "sshbuf.h" 50 #include "pathnames.h" 51 #include "log.h" 52 #include "misc.h" 53 #include "match.h" 54 #include "hostfile.h" 55 #include "dns.h" 56 #include "ssh.h" 57 #include "ssh2.h" 58 #include "ssherr.h" 59 #include "ssh-pkcs11.h" 60 #include "atomicio.h" 61 #include "krl.h" 62 #include "digest.h" 63 #include "utf8.h" 64 #include "authfd.h" 65 #include "sshsig.h" 66 #include "ssh-sk.h" 67 #include "sk-api.h" /* XXX for SSH_SK_USER_PRESENCE_REQD; remove */ 68 69 #ifdef WITH_OPENSSL 70 # define DEFAULT_KEY_TYPE_NAME "rsa" 71 #else 72 # define DEFAULT_KEY_TYPE_NAME "ed25519" 73 #endif 74 75 /* 76 * Default number of bits in the RSA, DSA and ECDSA keys. These value can be 77 * overridden on the command line. 78 * 79 * These values, with the exception of DSA, provide security equivalent to at 80 * least 128 bits of security according to NIST Special Publication 800-57: 81 * Recommendation for Key Management Part 1 rev 4 section 5.6.1. 82 * For DSA it (and FIPS-186-4 section 4.2) specifies that the only size for 83 * which a 160bit hash is acceptable is 1kbit, and since ssh-dss specifies only 84 * SHA1 we limit the DSA key size 1k bits. 85 */ 86 #define DEFAULT_BITS 3072 87 #define DEFAULT_BITS_DSA 1024 88 #define DEFAULT_BITS_ECDSA 256 89 90 static int quiet = 0; 91 92 /* Flag indicating that we just want to see the key fingerprint */ 93 static int print_fingerprint = 0; 94 static int print_bubblebabble = 0; 95 96 /* Hash algorithm to use for fingerprints. */ 97 static int fingerprint_hash = SSH_FP_HASH_DEFAULT; 98 99 /* The identity file name, given on the command line or entered by the user. */ 100 static char identity_file[PATH_MAX]; 101 static int have_identity = 0; 102 103 /* This is set to the passphrase if given on the command line. */ 104 static char *identity_passphrase = NULL; 105 106 /* This is set to the new passphrase if given on the command line. */ 107 static char *identity_new_passphrase = NULL; 108 109 /* Key type when certifying */ 110 static u_int cert_key_type = SSH2_CERT_TYPE_USER; 111 112 /* "key ID" of signed key */ 113 static char *cert_key_id = NULL; 114 115 /* Comma-separated list of principal names for certifying keys */ 116 static char *cert_principals = NULL; 117 118 /* Validity period for certificates */ 119 static u_int64_t cert_valid_from = 0; 120 static u_int64_t cert_valid_to = ~0ULL; 121 122 /* Certificate options */ 123 #define CERTOPT_X_FWD (1) 124 #define CERTOPT_AGENT_FWD (1<<1) 125 #define CERTOPT_PORT_FWD (1<<2) 126 #define CERTOPT_PTY (1<<3) 127 #define CERTOPT_USER_RC (1<<4) 128 #define CERTOPT_NO_REQUIRE_USER_PRESENCE (1<<5) 129 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 130 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 131 static u_int32_t certflags_flags = CERTOPT_DEFAULT; 132 static char *certflags_command = NULL; 133 static char *certflags_src_addr = NULL; 134 135 /* Arbitrary extensions specified by user */ 136 struct cert_userext { 137 char *key; 138 char *val; 139 int crit; 140 }; 141 static struct cert_userext *cert_userext; 142 static size_t ncert_userext; 143 144 /* Conversion to/from various formats */ 145 enum { 146 FMT_RFC4716, 147 FMT_PKCS8, 148 FMT_PEM 149 } convert_format = FMT_RFC4716; 150 151 static char *key_type_name = NULL; 152 153 /* Load key from this PKCS#11 provider */ 154 static char *pkcs11provider = NULL; 155 156 /* FIDO/U2F provider to use */ 157 static char *sk_provider = NULL; 158 159 /* Format for writing private keys */ 160 static int private_key_format = SSHKEY_PRIVATE_OPENSSH; 161 162 /* Cipher for new-format private keys */ 163 static char *openssh_format_cipher = NULL; 164 165 /* Number of KDF rounds to derive new format keys. */ 166 static int rounds = 0; 167 168 /* argv0 */ 169 extern char *__progname; 170 171 static char hostname[NI_MAXHOST]; 172 173 #ifdef WITH_OPENSSL 174 /* moduli.c */ 175 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 176 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 177 unsigned long); 178 #endif 179 180 static void 181 type_bits_valid(int type, const char *name, u_int32_t *bitsp) 182 { 183 if (type == KEY_UNSPEC) 184 fatal("unknown key type %s", key_type_name); 185 if (*bitsp == 0) { 186 #ifdef WITH_OPENSSL 187 u_int nid; 188 189 switch(type) { 190 case KEY_DSA: 191 *bitsp = DEFAULT_BITS_DSA; 192 break; 193 case KEY_ECDSA: 194 if (name != NULL && 195 (nid = sshkey_ecdsa_nid_from_name(name)) > 0) 196 *bitsp = sshkey_curve_nid_to_bits(nid); 197 if (*bitsp == 0) 198 *bitsp = DEFAULT_BITS_ECDSA; 199 break; 200 case KEY_RSA: 201 *bitsp = DEFAULT_BITS; 202 break; 203 } 204 #endif 205 } 206 #ifdef WITH_OPENSSL 207 switch (type) { 208 case KEY_DSA: 209 if (*bitsp != 1024) 210 fatal("Invalid DSA key length: must be 1024 bits"); 211 break; 212 case KEY_RSA: 213 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE) 214 fatal("Invalid RSA key length: minimum is %d bits", 215 SSH_RSA_MINIMUM_MODULUS_SIZE); 216 else if (*bitsp > OPENSSL_RSA_MAX_MODULUS_BITS) 217 fatal("Invalid RSA key length: maximum is %d bits", 218 OPENSSL_RSA_MAX_MODULUS_BITS); 219 break; 220 case KEY_ECDSA: 221 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1) 222 fatal("Invalid ECDSA key length: valid lengths are " 223 #ifdef OPENSSL_HAS_NISTP521 224 "256, 384 or 521 bits"); 225 #else 226 "256 or 384 bits"); 227 #endif 228 } 229 #endif 230 } 231 232 /* 233 * Checks whether a file exists and, if so, asks the user whether they wish 234 * to overwrite it. 235 * Returns nonzero if the file does not already exist or if the user agrees to 236 * overwrite, or zero otherwise. 237 */ 238 static int 239 confirm_overwrite(const char *filename) 240 { 241 char yesno[3]; 242 struct stat st; 243 244 if (stat(filename, &st) != 0) 245 return 1; 246 printf("%s already exists.\n", filename); 247 printf("Overwrite (y/n)? "); 248 fflush(stdout); 249 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 250 return 0; 251 if (yesno[0] != 'y' && yesno[0] != 'Y') 252 return 0; 253 return 1; 254 } 255 256 static void 257 ask_filename(struct passwd *pw, const char *prompt) 258 { 259 char buf[1024]; 260 char *name = NULL; 261 262 if (key_type_name == NULL) 263 name = _PATH_SSH_CLIENT_ID_RSA; 264 else { 265 switch (sshkey_type_from_name(key_type_name)) { 266 case KEY_DSA_CERT: 267 case KEY_DSA: 268 name = _PATH_SSH_CLIENT_ID_DSA; 269 break; 270 #ifdef OPENSSL_HAS_ECC 271 case KEY_ECDSA_CERT: 272 case KEY_ECDSA: 273 name = _PATH_SSH_CLIENT_ID_ECDSA; 274 break; 275 case KEY_ECDSA_SK_CERT: 276 case KEY_ECDSA_SK: 277 name = _PATH_SSH_CLIENT_ID_ECDSA_SK; 278 break; 279 #endif 280 case KEY_RSA_CERT: 281 case KEY_RSA: 282 name = _PATH_SSH_CLIENT_ID_RSA; 283 break; 284 case KEY_ED25519: 285 case KEY_ED25519_CERT: 286 name = _PATH_SSH_CLIENT_ID_ED25519; 287 break; 288 case KEY_ED25519_SK: 289 case KEY_ED25519_SK_CERT: 290 name = _PATH_SSH_CLIENT_ID_ED25519_SK; 291 break; 292 case KEY_XMSS: 293 case KEY_XMSS_CERT: 294 name = _PATH_SSH_CLIENT_ID_XMSS; 295 break; 296 default: 297 fatal("bad key type"); 298 } 299 } 300 snprintf(identity_file, sizeof(identity_file), 301 "%s/%s", pw->pw_dir, name); 302 printf("%s (%s): ", prompt, identity_file); 303 fflush(stdout); 304 if (fgets(buf, sizeof(buf), stdin) == NULL) 305 exit(1); 306 buf[strcspn(buf, "\n")] = '\0'; 307 if (strcmp(buf, "") != 0) 308 strlcpy(identity_file, buf, sizeof(identity_file)); 309 have_identity = 1; 310 } 311 312 static struct sshkey * 313 load_identity(const char *filename, char **commentp) 314 { 315 char *pass; 316 struct sshkey *prv; 317 int r; 318 319 if (commentp != NULL) 320 *commentp = NULL; 321 if ((r = sshkey_load_private(filename, "", &prv, commentp)) == 0) 322 return prv; 323 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 324 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 325 if (identity_passphrase) 326 pass = xstrdup(identity_passphrase); 327 else 328 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN); 329 r = sshkey_load_private(filename, pass, &prv, commentp); 330 freezero(pass, strlen(pass)); 331 if (r != 0) 332 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 333 return prv; 334 } 335 336 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 337 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 338 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 339 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 340 341 #ifdef WITH_OPENSSL 342 static void 343 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k) 344 { 345 struct sshbuf *b; 346 char comment[61], *b64; 347 int r; 348 349 if ((b = sshbuf_new()) == NULL) 350 fatal("%s: sshbuf_new failed", __func__); 351 if ((r = sshkey_putb(k, b)) != 0) 352 fatal("key_to_blob failed: %s", ssh_err(r)); 353 if ((b64 = sshbuf_dtob64_string(b, 1)) == NULL) 354 fatal("%s: sshbuf_dtob64_string failed", __func__); 355 356 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 357 snprintf(comment, sizeof(comment), 358 "%u-bit %s, converted by %s@%s from OpenSSH", 359 sshkey_size(k), sshkey_type(k), 360 pw->pw_name, hostname); 361 362 sshkey_free(k); 363 sshbuf_free(b); 364 365 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 366 fprintf(stdout, "Comment: \"%s\"\n%s", comment, b64); 367 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 368 free(b64); 369 exit(0); 370 } 371 372 static void 373 do_convert_to_pkcs8(struct sshkey *k) 374 { 375 switch (sshkey_type_plain(k->type)) { 376 case KEY_RSA: 377 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 378 fatal("PEM_write_RSA_PUBKEY failed"); 379 break; 380 case KEY_DSA: 381 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 382 fatal("PEM_write_DSA_PUBKEY failed"); 383 break; 384 #ifdef OPENSSL_HAS_ECC 385 case KEY_ECDSA: 386 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 387 fatal("PEM_write_EC_PUBKEY failed"); 388 break; 389 #endif 390 default: 391 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 392 } 393 exit(0); 394 } 395 396 static void 397 do_convert_to_pem(struct sshkey *k) 398 { 399 switch (sshkey_type_plain(k->type)) { 400 case KEY_RSA: 401 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 402 fatal("PEM_write_RSAPublicKey failed"); 403 break; 404 case KEY_DSA: 405 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 406 fatal("PEM_write_DSA_PUBKEY failed"); 407 break; 408 #ifdef OPENSSL_HAS_ECC 409 case KEY_ECDSA: 410 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 411 fatal("PEM_write_EC_PUBKEY failed"); 412 break; 413 #endif 414 default: 415 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 416 } 417 exit(0); 418 } 419 420 static void 421 do_convert_to(struct passwd *pw) 422 { 423 struct sshkey *k; 424 struct stat st; 425 int r; 426 427 if (!have_identity) 428 ask_filename(pw, "Enter file in which the key is"); 429 if (stat(identity_file, &st) == -1) 430 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 431 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0) 432 k = load_identity(identity_file, NULL); 433 switch (convert_format) { 434 case FMT_RFC4716: 435 do_convert_to_ssh2(pw, k); 436 break; 437 case FMT_PKCS8: 438 do_convert_to_pkcs8(k); 439 break; 440 case FMT_PEM: 441 do_convert_to_pem(k); 442 break; 443 default: 444 fatal("%s: unknown key format %d", __func__, convert_format); 445 } 446 exit(0); 447 } 448 449 /* 450 * This is almost exactly the bignum1 encoding, but with 32 bit for length 451 * instead of 16. 452 */ 453 static void 454 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value) 455 { 456 u_int bytes, bignum_bits; 457 int r; 458 459 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0) 460 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 461 bytes = (bignum_bits + 7) / 8; 462 if (sshbuf_len(b) < bytes) 463 fatal("%s: input buffer too small: need %d have %zu", 464 __func__, bytes, sshbuf_len(b)); 465 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL) 466 fatal("%s: BN_bin2bn failed", __func__); 467 if ((r = sshbuf_consume(b, bytes)) != 0) 468 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 469 } 470 471 static struct sshkey * 472 do_convert_private_ssh2(struct sshbuf *b) 473 { 474 struct sshkey *key = NULL; 475 char *type, *cipher; 476 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345"; 477 int r, rlen, ktype; 478 u_int magic, i1, i2, i3, i4; 479 size_t slen; 480 u_long e; 481 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL; 482 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL; 483 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL; 484 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL; 485 486 if ((r = sshbuf_get_u32(b, &magic)) != 0) 487 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 488 489 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 490 error("bad magic 0x%x != 0x%x", magic, 491 SSH_COM_PRIVATE_KEY_MAGIC); 492 return NULL; 493 } 494 if ((r = sshbuf_get_u32(b, &i1)) != 0 || 495 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 496 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 || 497 (r = sshbuf_get_u32(b, &i2)) != 0 || 498 (r = sshbuf_get_u32(b, &i3)) != 0 || 499 (r = sshbuf_get_u32(b, &i4)) != 0) 500 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 501 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 502 if (strcmp(cipher, "none") != 0) { 503 error("unsupported cipher %s", cipher); 504 free(cipher); 505 free(type); 506 return NULL; 507 } 508 free(cipher); 509 510 if (strstr(type, "dsa")) { 511 ktype = KEY_DSA; 512 } else if (strstr(type, "rsa")) { 513 ktype = KEY_RSA; 514 } else { 515 free(type); 516 return NULL; 517 } 518 if ((key = sshkey_new(ktype)) == NULL) 519 fatal("sshkey_new failed"); 520 free(type); 521 522 switch (key->type) { 523 case KEY_DSA: 524 if ((dsa_p = BN_new()) == NULL || 525 (dsa_q = BN_new()) == NULL || 526 (dsa_g = BN_new()) == NULL || 527 (dsa_pub_key = BN_new()) == NULL || 528 (dsa_priv_key = BN_new()) == NULL) 529 fatal("%s: BN_new", __func__); 530 buffer_get_bignum_bits(b, dsa_p); 531 buffer_get_bignum_bits(b, dsa_g); 532 buffer_get_bignum_bits(b, dsa_q); 533 buffer_get_bignum_bits(b, dsa_pub_key); 534 buffer_get_bignum_bits(b, dsa_priv_key); 535 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) 536 fatal("%s: DSA_set0_pqg failed", __func__); 537 dsa_p = dsa_q = dsa_g = NULL; /* transferred */ 538 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key)) 539 fatal("%s: DSA_set0_key failed", __func__); 540 dsa_pub_key = dsa_priv_key = NULL; /* transferred */ 541 break; 542 case KEY_RSA: 543 if ((r = sshbuf_get_u8(b, &e1)) != 0 || 544 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) || 545 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0)) 546 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 547 e = e1; 548 debug("e %lx", e); 549 if (e < 30) { 550 e <<= 8; 551 e += e2; 552 debug("e %lx", e); 553 e <<= 8; 554 e += e3; 555 debug("e %lx", e); 556 } 557 if ((rsa_e = BN_new()) == NULL) 558 fatal("%s: BN_new", __func__); 559 if (!BN_set_word(rsa_e, e)) { 560 BN_clear_free(rsa_e); 561 sshkey_free(key); 562 return NULL; 563 } 564 if ((rsa_n = BN_new()) == NULL || 565 (rsa_d = BN_new()) == NULL || 566 (rsa_p = BN_new()) == NULL || 567 (rsa_q = BN_new()) == NULL || 568 (rsa_iqmp = BN_new()) == NULL) 569 fatal("%s: BN_new", __func__); 570 buffer_get_bignum_bits(b, rsa_d); 571 buffer_get_bignum_bits(b, rsa_n); 572 buffer_get_bignum_bits(b, rsa_iqmp); 573 buffer_get_bignum_bits(b, rsa_q); 574 buffer_get_bignum_bits(b, rsa_p); 575 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d)) 576 fatal("%s: RSA_set0_key failed", __func__); 577 rsa_n = rsa_e = rsa_d = NULL; /* transferred */ 578 if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q)) 579 fatal("%s: RSA_set0_factors failed", __func__); 580 rsa_p = rsa_q = NULL; /* transferred */ 581 if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0) 582 fatal("generate RSA parameters failed: %s", ssh_err(r)); 583 BN_clear_free(rsa_iqmp); 584 break; 585 } 586 rlen = sshbuf_len(b); 587 if (rlen != 0) 588 error("%s: remaining bytes in key blob %d", __func__, rlen); 589 590 /* try the key */ 591 if (sshkey_sign(key, &sig, &slen, data, sizeof(data), 592 NULL, NULL, 0) != 0 || 593 sshkey_verify(key, sig, slen, data, sizeof(data), 594 NULL, 0, NULL) != 0) { 595 sshkey_free(key); 596 free(sig); 597 return NULL; 598 } 599 free(sig); 600 return key; 601 } 602 603 static int 604 get_line(FILE *fp, char *line, size_t len) 605 { 606 int c; 607 size_t pos = 0; 608 609 line[0] = '\0'; 610 while ((c = fgetc(fp)) != EOF) { 611 if (pos >= len - 1) 612 fatal("input line too long."); 613 switch (c) { 614 case '\r': 615 c = fgetc(fp); 616 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) 617 fatal("unget: %s", strerror(errno)); 618 return pos; 619 case '\n': 620 return pos; 621 } 622 line[pos++] = c; 623 line[pos] = '\0'; 624 } 625 /* We reached EOF */ 626 return -1; 627 } 628 629 static void 630 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private) 631 { 632 int r, blen, escaped = 0; 633 u_int len; 634 char line[1024]; 635 struct sshbuf *buf; 636 char encoded[8096]; 637 FILE *fp; 638 639 if ((buf = sshbuf_new()) == NULL) 640 fatal("sshbuf_new failed"); 641 if ((fp = fopen(identity_file, "r")) == NULL) 642 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 643 encoded[0] = '\0'; 644 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 645 if (blen > 0 && line[blen - 1] == '\\') 646 escaped++; 647 if (strncmp(line, "----", 4) == 0 || 648 strstr(line, ": ") != NULL) { 649 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 650 *private = 1; 651 if (strstr(line, " END ") != NULL) { 652 break; 653 } 654 /* fprintf(stderr, "ignore: %s", line); */ 655 continue; 656 } 657 if (escaped) { 658 escaped--; 659 /* fprintf(stderr, "escaped: %s", line); */ 660 continue; 661 } 662 strlcat(encoded, line, sizeof(encoded)); 663 } 664 len = strlen(encoded); 665 if (((len % 4) == 3) && 666 (encoded[len-1] == '=') && 667 (encoded[len-2] == '=') && 668 (encoded[len-3] == '=')) 669 encoded[len-3] = '\0'; 670 if ((r = sshbuf_b64tod(buf, encoded)) != 0) 671 fatal("%s: base64 decoding failed: %s", __func__, ssh_err(r)); 672 if (*private) { 673 if ((*k = do_convert_private_ssh2(buf)) == NULL) 674 fatal("%s: private key conversion failed", __func__); 675 } else if ((r = sshkey_fromb(buf, k)) != 0) 676 fatal("decode blob failed: %s", ssh_err(r)); 677 sshbuf_free(buf); 678 fclose(fp); 679 } 680 681 static void 682 do_convert_from_pkcs8(struct sshkey **k, int *private) 683 { 684 EVP_PKEY *pubkey; 685 FILE *fp; 686 687 if ((fp = fopen(identity_file, "r")) == NULL) 688 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 689 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 690 fatal("%s: %s is not a recognised public key format", __func__, 691 identity_file); 692 } 693 fclose(fp); 694 switch (EVP_PKEY_base_id(pubkey)) { 695 case EVP_PKEY_RSA: 696 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 697 fatal("sshkey_new failed"); 698 (*k)->type = KEY_RSA; 699 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 700 break; 701 case EVP_PKEY_DSA: 702 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 703 fatal("sshkey_new failed"); 704 (*k)->type = KEY_DSA; 705 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 706 break; 707 #ifdef OPENSSL_HAS_ECC 708 case EVP_PKEY_EC: 709 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 710 fatal("sshkey_new failed"); 711 (*k)->type = KEY_ECDSA; 712 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 713 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa); 714 break; 715 #endif 716 default: 717 fatal("%s: unsupported pubkey type %d", __func__, 718 EVP_PKEY_base_id(pubkey)); 719 } 720 EVP_PKEY_free(pubkey); 721 return; 722 } 723 724 static void 725 do_convert_from_pem(struct sshkey **k, int *private) 726 { 727 FILE *fp; 728 RSA *rsa; 729 730 if ((fp = fopen(identity_file, "r")) == NULL) 731 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 732 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 733 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 734 fatal("sshkey_new failed"); 735 (*k)->type = KEY_RSA; 736 (*k)->rsa = rsa; 737 fclose(fp); 738 return; 739 } 740 fatal("%s: unrecognised raw private key format", __func__); 741 } 742 743 static void 744 do_convert_from(struct passwd *pw) 745 { 746 struct sshkey *k = NULL; 747 int r, private = 0, ok = 0; 748 struct stat st; 749 750 if (!have_identity) 751 ask_filename(pw, "Enter file in which the key is"); 752 if (stat(identity_file, &st) == -1) 753 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 754 755 switch (convert_format) { 756 case FMT_RFC4716: 757 do_convert_from_ssh2(pw, &k, &private); 758 break; 759 case FMT_PKCS8: 760 do_convert_from_pkcs8(&k, &private); 761 break; 762 case FMT_PEM: 763 do_convert_from_pem(&k, &private); 764 break; 765 default: 766 fatal("%s: unknown key format %d", __func__, convert_format); 767 } 768 769 if (!private) { 770 if ((r = sshkey_write(k, stdout)) == 0) 771 ok = 1; 772 if (ok) 773 fprintf(stdout, "\n"); 774 } else { 775 switch (k->type) { 776 case KEY_DSA: 777 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 778 NULL, 0, NULL, NULL); 779 break; 780 #ifdef OPENSSL_HAS_ECC 781 case KEY_ECDSA: 782 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 783 NULL, 0, NULL, NULL); 784 break; 785 #endif 786 case KEY_RSA: 787 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 788 NULL, 0, NULL, NULL); 789 break; 790 default: 791 fatal("%s: unsupported key type %s", __func__, 792 sshkey_type(k)); 793 } 794 } 795 796 if (!ok) 797 fatal("key write failed"); 798 sshkey_free(k); 799 exit(0); 800 } 801 #endif 802 803 static void 804 do_print_public(struct passwd *pw) 805 { 806 struct sshkey *prv; 807 struct stat st; 808 int r; 809 char *comment = NULL; 810 811 if (!have_identity) 812 ask_filename(pw, "Enter file in which the key is"); 813 if (stat(identity_file, &st) == -1) 814 fatal("%s: %s", identity_file, strerror(errno)); 815 prv = load_identity(identity_file, &comment); 816 if ((r = sshkey_write(prv, stdout)) != 0) 817 error("sshkey_write failed: %s", ssh_err(r)); 818 sshkey_free(prv); 819 if (comment != NULL && *comment != '\0') 820 fprintf(stdout, " %s", comment); 821 fprintf(stdout, "\n"); 822 free(comment); 823 exit(0); 824 } 825 826 static void 827 do_download(struct passwd *pw) 828 { 829 #ifdef ENABLE_PKCS11 830 struct sshkey **keys = NULL; 831 int i, nkeys; 832 enum sshkey_fp_rep rep; 833 int fptype; 834 char *fp, *ra, **comments = NULL; 835 836 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 837 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 838 839 pkcs11_init(1); 840 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys, &comments); 841 if (nkeys <= 0) 842 fatal("cannot read public key from pkcs11"); 843 for (i = 0; i < nkeys; i++) { 844 if (print_fingerprint) { 845 fp = sshkey_fingerprint(keys[i], fptype, rep); 846 ra = sshkey_fingerprint(keys[i], fingerprint_hash, 847 SSH_FP_RANDOMART); 848 if (fp == NULL || ra == NULL) 849 fatal("%s: sshkey_fingerprint fail", __func__); 850 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]), 851 fp, sshkey_type(keys[i])); 852 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 853 printf("%s\n", ra); 854 free(ra); 855 free(fp); 856 } else { 857 (void) sshkey_write(keys[i], stdout); /* XXX check */ 858 fprintf(stdout, "%s%s\n", 859 *(comments[i]) == '\0' ? "" : " ", comments[i]); 860 } 861 free(comments[i]); 862 sshkey_free(keys[i]); 863 } 864 free(comments); 865 free(keys); 866 pkcs11_terminate(); 867 exit(0); 868 #else 869 fatal("no pkcs11 support"); 870 #endif /* ENABLE_PKCS11 */ 871 } 872 873 static struct sshkey * 874 try_read_key(char **cpp) 875 { 876 struct sshkey *ret; 877 int r; 878 879 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL) 880 fatal("sshkey_new failed"); 881 if ((r = sshkey_read(ret, cpp)) == 0) 882 return ret; 883 /* Not a key */ 884 sshkey_free(ret); 885 return NULL; 886 } 887 888 static void 889 fingerprint_one_key(const struct sshkey *public, const char *comment) 890 { 891 char *fp = NULL, *ra = NULL; 892 enum sshkey_fp_rep rep; 893 int fptype; 894 895 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 896 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 897 fp = sshkey_fingerprint(public, fptype, rep); 898 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART); 899 if (fp == NULL || ra == NULL) 900 fatal("%s: sshkey_fingerprint failed", __func__); 901 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp, 902 comment ? comment : "no comment", sshkey_type(public)); 903 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 904 printf("%s\n", ra); 905 free(ra); 906 free(fp); 907 } 908 909 static void 910 fingerprint_private(const char *path) 911 { 912 struct stat st; 913 char *comment = NULL; 914 struct sshkey *privkey = NULL, *pubkey = NULL; 915 int r; 916 917 if (stat(identity_file, &st) == -1) 918 fatal("%s: %s", path, strerror(errno)); 919 if ((r = sshkey_load_public(path, &pubkey, &comment)) != 0) 920 debug("load public \"%s\": %s", path, ssh_err(r)); 921 if (pubkey == NULL || comment == NULL || *comment == '\0') { 922 free(comment); 923 if ((r = sshkey_load_private(path, NULL, 924 &privkey, &comment)) != 0) 925 debug("load private \"%s\": %s", path, ssh_err(r)); 926 } 927 if (pubkey == NULL && privkey == NULL) 928 fatal("%s is not a key file.", path); 929 930 fingerprint_one_key(pubkey == NULL ? privkey : pubkey, comment); 931 sshkey_free(pubkey); 932 sshkey_free(privkey); 933 free(comment); 934 } 935 936 static void 937 do_fingerprint(struct passwd *pw) 938 { 939 FILE *f; 940 struct sshkey *public = NULL; 941 char *comment = NULL, *cp, *ep, *line = NULL; 942 size_t linesize = 0; 943 int i, invalid = 1; 944 const char *path; 945 u_long lnum = 0; 946 947 if (!have_identity) 948 ask_filename(pw, "Enter file in which the key is"); 949 path = identity_file; 950 951 if (strcmp(identity_file, "-") == 0) { 952 f = stdin; 953 path = "(stdin)"; 954 } else if ((f = fopen(path, "r")) == NULL) 955 fatal("%s: %s: %s", __progname, path, strerror(errno)); 956 957 while (getline(&line, &linesize, f) != -1) { 958 lnum++; 959 cp = line; 960 cp[strcspn(cp, "\n")] = '\0'; 961 /* Trim leading space and comments */ 962 cp = line + strspn(line, " \t"); 963 if (*cp == '#' || *cp == '\0') 964 continue; 965 966 /* 967 * Input may be plain keys, private keys, authorized_keys 968 * or known_hosts. 969 */ 970 971 /* 972 * Try private keys first. Assume a key is private if 973 * "SSH PRIVATE KEY" appears on the first line and we're 974 * not reading from stdin (XXX support private keys on stdin). 975 */ 976 if (lnum == 1 && strcmp(identity_file, "-") != 0 && 977 strstr(cp, "PRIVATE KEY") != NULL) { 978 free(line); 979 fclose(f); 980 fingerprint_private(path); 981 exit(0); 982 } 983 984 /* 985 * If it's not a private key, then this must be prepared to 986 * accept a public key prefixed with a hostname or options. 987 * Try a bare key first, otherwise skip the leading stuff. 988 */ 989 if ((public = try_read_key(&cp)) == NULL) { 990 i = strtol(cp, &ep, 10); 991 if (i == 0 || ep == NULL || 992 (*ep != ' ' && *ep != '\t')) { 993 int quoted = 0; 994 995 comment = cp; 996 for (; *cp && (quoted || (*cp != ' ' && 997 *cp != '\t')); cp++) { 998 if (*cp == '\\' && cp[1] == '"') 999 cp++; /* Skip both */ 1000 else if (*cp == '"') 1001 quoted = !quoted; 1002 } 1003 if (!*cp) 1004 continue; 1005 *cp++ = '\0'; 1006 } 1007 } 1008 /* Retry after parsing leading hostname/key options */ 1009 if (public == NULL && (public = try_read_key(&cp)) == NULL) { 1010 debug("%s:%lu: not a public key", path, lnum); 1011 continue; 1012 } 1013 1014 /* Find trailing comment, if any */ 1015 for (; *cp == ' ' || *cp == '\t'; cp++) 1016 ; 1017 if (*cp != '\0' && *cp != '#') 1018 comment = cp; 1019 1020 fingerprint_one_key(public, comment); 1021 sshkey_free(public); 1022 invalid = 0; /* One good key in the file is sufficient */ 1023 } 1024 fclose(f); 1025 free(line); 1026 1027 if (invalid) 1028 fatal("%s is not a public key file.", path); 1029 exit(0); 1030 } 1031 1032 static void 1033 do_gen_all_hostkeys(struct passwd *pw) 1034 { 1035 struct { 1036 char *key_type; 1037 char *key_type_display; 1038 char *path; 1039 } key_types[] = { 1040 #ifdef WITH_OPENSSL 1041 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 1042 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 1043 #ifdef OPENSSL_HAS_ECC 1044 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 1045 #endif /* OPENSSL_HAS_ECC */ 1046 #endif /* WITH_OPENSSL */ 1047 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE }, 1048 #ifdef WITH_XMSS 1049 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE }, 1050 #endif /* WITH_XMSS */ 1051 { NULL, NULL, NULL } 1052 }; 1053 1054 u_int32_t bits = 0; 1055 int first = 0; 1056 struct stat st; 1057 struct sshkey *private, *public; 1058 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file; 1059 int i, type, fd, r; 1060 1061 for (i = 0; key_types[i].key_type; i++) { 1062 public = private = NULL; 1063 prv_tmp = pub_tmp = prv_file = pub_file = NULL; 1064 1065 xasprintf(&prv_file, "%s%s", 1066 identity_file, key_types[i].path); 1067 1068 /* Check whether private key exists and is not zero-length */ 1069 if (stat(prv_file, &st) == 0) { 1070 if (st.st_size != 0) 1071 goto next; 1072 } else if (errno != ENOENT) { 1073 error("Could not stat %s: %s", key_types[i].path, 1074 strerror(errno)); 1075 goto failnext; 1076 } 1077 1078 /* 1079 * Private key doesn't exist or is invalid; proceed with 1080 * key generation. 1081 */ 1082 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX", 1083 identity_file, key_types[i].path); 1084 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX", 1085 identity_file, key_types[i].path); 1086 xasprintf(&pub_file, "%s%s.pub", 1087 identity_file, key_types[i].path); 1088 1089 if (first == 0) { 1090 first = 1; 1091 printf("%s: generating new host keys: ", __progname); 1092 } 1093 printf("%s ", key_types[i].key_type_display); 1094 fflush(stdout); 1095 type = sshkey_type_from_name(key_types[i].key_type); 1096 if ((fd = mkstemp(prv_tmp)) == -1) { 1097 error("Could not save your private key in %s: %s", 1098 prv_tmp, strerror(errno)); 1099 goto failnext; 1100 } 1101 (void)close(fd); /* just using mkstemp() to reserve a name */ 1102 bits = 0; 1103 type_bits_valid(type, NULL, &bits); 1104 if ((r = sshkey_generate(type, bits, &private)) != 0) { 1105 error("sshkey_generate failed: %s", ssh_err(r)); 1106 goto failnext; 1107 } 1108 if ((r = sshkey_from_private(private, &public)) != 0) 1109 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1110 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 1111 hostname); 1112 if ((r = sshkey_save_private(private, prv_tmp, "", 1113 comment, private_key_format, openssh_format_cipher, 1114 rounds)) != 0) { 1115 error("Saving key \"%s\" failed: %s", 1116 prv_tmp, ssh_err(r)); 1117 goto failnext; 1118 } 1119 if ((fd = mkstemp(pub_tmp)) == -1) { 1120 error("Could not save your public key in %s: %s", 1121 pub_tmp, strerror(errno)); 1122 goto failnext; 1123 } 1124 (void)fchmod(fd, 0644); 1125 (void)close(fd); 1126 if ((r = sshkey_save_public(public, pub_tmp, comment)) != 0) { 1127 fatal("Unable to save public key to %s: %s", 1128 identity_file, ssh_err(r)); 1129 goto failnext; 1130 } 1131 1132 /* Rename temporary files to their permanent locations. */ 1133 if (rename(pub_tmp, pub_file) != 0) { 1134 error("Unable to move %s into position: %s", 1135 pub_file, strerror(errno)); 1136 goto failnext; 1137 } 1138 if (rename(prv_tmp, prv_file) != 0) { 1139 error("Unable to move %s into position: %s", 1140 key_types[i].path, strerror(errno)); 1141 failnext: 1142 first = 0; 1143 goto next; 1144 } 1145 next: 1146 sshkey_free(private); 1147 sshkey_free(public); 1148 free(prv_tmp); 1149 free(pub_tmp); 1150 free(prv_file); 1151 free(pub_file); 1152 } 1153 if (first != 0) 1154 printf("\n"); 1155 } 1156 1157 struct known_hosts_ctx { 1158 const char *host; /* Hostname searched for in find/delete case */ 1159 FILE *out; /* Output file, stdout for find_hosts case */ 1160 int has_unhashed; /* When hashing, original had unhashed hosts */ 1161 int found_key; /* For find/delete, host was found */ 1162 int invalid; /* File contained invalid items; don't delete */ 1163 int hash_hosts; /* Hash hostnames as we go */ 1164 int find_host; /* Search for specific hostname */ 1165 int delete_host; /* Delete host from known_hosts */ 1166 }; 1167 1168 static int 1169 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx) 1170 { 1171 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1172 char *hashed, *cp, *hosts, *ohosts; 1173 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts); 1174 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM; 1175 1176 switch (l->status) { 1177 case HKF_STATUS_OK: 1178 case HKF_STATUS_MATCHED: 1179 /* 1180 * Don't hash hosts already already hashed, with wildcard 1181 * characters or a CA/revocation marker. 1182 */ 1183 if (was_hashed || has_wild || l->marker != MRK_NONE) { 1184 fprintf(ctx->out, "%s\n", l->line); 1185 if (has_wild && !ctx->find_host) { 1186 logit("%s:%lu: ignoring host name " 1187 "with wildcard: %.64s", l->path, 1188 l->linenum, l->hosts); 1189 } 1190 return 0; 1191 } 1192 /* 1193 * Split any comma-separated hostnames from the host list, 1194 * hash and store separately. 1195 */ 1196 ohosts = hosts = xstrdup(l->hosts); 1197 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') { 1198 lowercase(cp); 1199 if ((hashed = host_hash(cp, NULL, 0)) == NULL) 1200 fatal("hash_host failed"); 1201 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey); 1202 ctx->has_unhashed = 1; 1203 } 1204 free(ohosts); 1205 return 0; 1206 case HKF_STATUS_INVALID: 1207 /* Retain invalid lines, but mark file as invalid. */ 1208 ctx->invalid = 1; 1209 logit("%s:%lu: invalid line", l->path, l->linenum); 1210 /* FALLTHROUGH */ 1211 default: 1212 fprintf(ctx->out, "%s\n", l->line); 1213 return 0; 1214 } 1215 /* NOTREACHED */ 1216 return -1; 1217 } 1218 1219 static int 1220 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx) 1221 { 1222 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1223 enum sshkey_fp_rep rep; 1224 int fptype; 1225 char *fp = NULL, *ra = NULL; 1226 1227 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 1228 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 1229 1230 if (l->status == HKF_STATUS_MATCHED) { 1231 if (ctx->delete_host) { 1232 if (l->marker != MRK_NONE) { 1233 /* Don't remove CA and revocation lines */ 1234 fprintf(ctx->out, "%s\n", l->line); 1235 } else { 1236 /* 1237 * Hostname matches and has no CA/revoke 1238 * marker, delete it by *not* writing the 1239 * line to ctx->out. 1240 */ 1241 ctx->found_key = 1; 1242 if (!quiet) 1243 printf("# Host %s found: line %lu\n", 1244 ctx->host, l->linenum); 1245 } 1246 return 0; 1247 } else if (ctx->find_host) { 1248 ctx->found_key = 1; 1249 if (!quiet) { 1250 printf("# Host %s found: line %lu %s\n", 1251 ctx->host, 1252 l->linenum, l->marker == MRK_CA ? "CA" : 1253 (l->marker == MRK_REVOKE ? "REVOKED" : "")); 1254 } 1255 if (ctx->hash_hosts) 1256 known_hosts_hash(l, ctx); 1257 else if (print_fingerprint) { 1258 fp = sshkey_fingerprint(l->key, fptype, rep); 1259 ra = sshkey_fingerprint(l->key, 1260 fingerprint_hash, SSH_FP_RANDOMART); 1261 if (fp == NULL || ra == NULL) 1262 fatal("%s: sshkey_fingerprint failed", 1263 __func__); 1264 mprintf("%s %s %s%s%s\n", ctx->host, 1265 sshkey_type(l->key), fp, 1266 l->comment[0] ? " " : "", 1267 l->comment); 1268 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 1269 printf("%s\n", ra); 1270 free(ra); 1271 free(fp); 1272 } else 1273 fprintf(ctx->out, "%s\n", l->line); 1274 return 0; 1275 } 1276 } else if (ctx->delete_host) { 1277 /* Retain non-matching hosts when deleting */ 1278 if (l->status == HKF_STATUS_INVALID) { 1279 ctx->invalid = 1; 1280 logit("%s:%lu: invalid line", l->path, l->linenum); 1281 } 1282 fprintf(ctx->out, "%s\n", l->line); 1283 } 1284 return 0; 1285 } 1286 1287 static void 1288 do_known_hosts(struct passwd *pw, const char *name, int find_host, 1289 int delete_host, int hash_hosts) 1290 { 1291 char *cp, tmp[PATH_MAX], old[PATH_MAX]; 1292 int r, fd, oerrno, inplace = 0; 1293 struct known_hosts_ctx ctx; 1294 u_int foreach_options; 1295 1296 if (!have_identity) { 1297 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1298 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1299 sizeof(identity_file)) 1300 fatal("Specified known hosts path too long"); 1301 free(cp); 1302 have_identity = 1; 1303 } 1304 1305 memset(&ctx, 0, sizeof(ctx)); 1306 ctx.out = stdout; 1307 ctx.host = name; 1308 ctx.hash_hosts = hash_hosts; 1309 ctx.find_host = find_host; 1310 ctx.delete_host = delete_host; 1311 1312 /* 1313 * Find hosts goes to stdout, hash and deletions happen in-place 1314 * A corner case is ssh-keygen -HF foo, which should go to stdout 1315 */ 1316 if (!find_host && (hash_hosts || delete_host)) { 1317 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1318 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1319 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1320 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1321 fatal("known_hosts path too long"); 1322 umask(077); 1323 if ((fd = mkstemp(tmp)) == -1) 1324 fatal("mkstemp: %s", strerror(errno)); 1325 if ((ctx.out = fdopen(fd, "w")) == NULL) { 1326 oerrno = errno; 1327 unlink(tmp); 1328 fatal("fdopen: %s", strerror(oerrno)); 1329 } 1330 inplace = 1; 1331 } 1332 /* XXX support identity_file == "-" for stdin */ 1333 foreach_options = find_host ? HKF_WANT_MATCH : 0; 1334 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0; 1335 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ? 1336 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL, 1337 foreach_options)) != 0) { 1338 if (inplace) 1339 unlink(tmp); 1340 fatal("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r)); 1341 } 1342 1343 if (inplace) 1344 fclose(ctx.out); 1345 1346 if (ctx.invalid) { 1347 error("%s is not a valid known_hosts file.", identity_file); 1348 if (inplace) { 1349 error("Not replacing existing known_hosts " 1350 "file because of errors"); 1351 unlink(tmp); 1352 } 1353 exit(1); 1354 } else if (delete_host && !ctx.found_key) { 1355 logit("Host %s not found in %s", name, identity_file); 1356 if (inplace) 1357 unlink(tmp); 1358 } else if (inplace) { 1359 /* Backup existing file */ 1360 if (unlink(old) == -1 && errno != ENOENT) 1361 fatal("unlink %.100s: %s", old, strerror(errno)); 1362 if (link(identity_file, old) == -1) 1363 fatal("link %.100s to %.100s: %s", identity_file, old, 1364 strerror(errno)); 1365 /* Move new one into place */ 1366 if (rename(tmp, identity_file) == -1) { 1367 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1368 strerror(errno)); 1369 unlink(tmp); 1370 unlink(old); 1371 exit(1); 1372 } 1373 1374 printf("%s updated.\n", identity_file); 1375 printf("Original contents retained as %s\n", old); 1376 if (ctx.has_unhashed) { 1377 logit("WARNING: %s contains unhashed entries", old); 1378 logit("Delete this file to ensure privacy " 1379 "of hostnames"); 1380 } 1381 } 1382 1383 exit (find_host && !ctx.found_key); 1384 } 1385 1386 /* 1387 * Perform changing a passphrase. The argument is the passwd structure 1388 * for the current user. 1389 */ 1390 static void 1391 do_change_passphrase(struct passwd *pw) 1392 { 1393 char *comment; 1394 char *old_passphrase, *passphrase1, *passphrase2; 1395 struct stat st; 1396 struct sshkey *private; 1397 int r; 1398 1399 if (!have_identity) 1400 ask_filename(pw, "Enter file in which the key is"); 1401 if (stat(identity_file, &st) == -1) 1402 fatal("%s: %s", identity_file, strerror(errno)); 1403 /* Try to load the file with empty passphrase. */ 1404 r = sshkey_load_private(identity_file, "", &private, &comment); 1405 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) { 1406 if (identity_passphrase) 1407 old_passphrase = xstrdup(identity_passphrase); 1408 else 1409 old_passphrase = 1410 read_passphrase("Enter old passphrase: ", 1411 RP_ALLOW_STDIN); 1412 r = sshkey_load_private(identity_file, old_passphrase, 1413 &private, &comment); 1414 freezero(old_passphrase, strlen(old_passphrase)); 1415 if (r != 0) 1416 goto badkey; 1417 } else if (r != 0) { 1418 badkey: 1419 fatal("Failed to load key %s: %s", identity_file, ssh_err(r)); 1420 } 1421 if (comment) 1422 mprintf("Key has comment '%s'\n", comment); 1423 1424 /* Ask the new passphrase (twice). */ 1425 if (identity_new_passphrase) { 1426 passphrase1 = xstrdup(identity_new_passphrase); 1427 passphrase2 = NULL; 1428 } else { 1429 passphrase1 = 1430 read_passphrase("Enter new passphrase (empty for no " 1431 "passphrase): ", RP_ALLOW_STDIN); 1432 passphrase2 = read_passphrase("Enter same passphrase again: ", 1433 RP_ALLOW_STDIN); 1434 1435 /* Verify that they are the same. */ 1436 if (strcmp(passphrase1, passphrase2) != 0) { 1437 explicit_bzero(passphrase1, strlen(passphrase1)); 1438 explicit_bzero(passphrase2, strlen(passphrase2)); 1439 free(passphrase1); 1440 free(passphrase2); 1441 printf("Pass phrases do not match. Try again.\n"); 1442 exit(1); 1443 } 1444 /* Destroy the other copy. */ 1445 freezero(passphrase2, strlen(passphrase2)); 1446 } 1447 1448 /* Save the file using the new passphrase. */ 1449 if ((r = sshkey_save_private(private, identity_file, passphrase1, 1450 comment, private_key_format, openssh_format_cipher, rounds)) != 0) { 1451 error("Saving key \"%s\" failed: %s.", 1452 identity_file, ssh_err(r)); 1453 freezero(passphrase1, strlen(passphrase1)); 1454 sshkey_free(private); 1455 free(comment); 1456 exit(1); 1457 } 1458 /* Destroy the passphrase and the copy of the key in memory. */ 1459 freezero(passphrase1, strlen(passphrase1)); 1460 sshkey_free(private); /* Destroys contents */ 1461 free(comment); 1462 1463 printf("Your identification has been saved with the new passphrase.\n"); 1464 exit(0); 1465 } 1466 1467 /* 1468 * Print the SSHFP RR. 1469 */ 1470 static int 1471 do_print_resource_record(struct passwd *pw, char *fname, char *hname, 1472 int print_generic) 1473 { 1474 struct sshkey *public; 1475 char *comment = NULL; 1476 struct stat st; 1477 int r; 1478 1479 if (fname == NULL) 1480 fatal("%s: no filename", __func__); 1481 if (stat(fname, &st) == -1) { 1482 if (errno == ENOENT) 1483 return 0; 1484 fatal("%s: %s", fname, strerror(errno)); 1485 } 1486 if ((r = sshkey_load_public(fname, &public, &comment)) != 0) 1487 fatal("Failed to read v2 public key from \"%s\": %s.", 1488 fname, ssh_err(r)); 1489 export_dns_rr(hname, public, stdout, print_generic); 1490 sshkey_free(public); 1491 free(comment); 1492 return 1; 1493 } 1494 1495 /* 1496 * Change the comment of a private key file. 1497 */ 1498 static void 1499 do_change_comment(struct passwd *pw, const char *identity_comment) 1500 { 1501 char new_comment[1024], *comment, *passphrase; 1502 struct sshkey *private; 1503 struct sshkey *public; 1504 struct stat st; 1505 int r; 1506 1507 if (!have_identity) 1508 ask_filename(pw, "Enter file in which the key is"); 1509 if (stat(identity_file, &st) == -1) 1510 fatal("%s: %s", identity_file, strerror(errno)); 1511 if ((r = sshkey_load_private(identity_file, "", 1512 &private, &comment)) == 0) 1513 passphrase = xstrdup(""); 1514 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 1515 fatal("Cannot load private key \"%s\": %s.", 1516 identity_file, ssh_err(r)); 1517 else { 1518 if (identity_passphrase) 1519 passphrase = xstrdup(identity_passphrase); 1520 else if (identity_new_passphrase) 1521 passphrase = xstrdup(identity_new_passphrase); 1522 else 1523 passphrase = read_passphrase("Enter passphrase: ", 1524 RP_ALLOW_STDIN); 1525 /* Try to load using the passphrase. */ 1526 if ((r = sshkey_load_private(identity_file, passphrase, 1527 &private, &comment)) != 0) { 1528 freezero(passphrase, strlen(passphrase)); 1529 fatal("Cannot load private key \"%s\": %s.", 1530 identity_file, ssh_err(r)); 1531 } 1532 } 1533 1534 if (private->type != KEY_ED25519 && private->type != KEY_XMSS && 1535 private_key_format != SSHKEY_PRIVATE_OPENSSH) { 1536 error("Comments are only supported for keys stored in " 1537 "the new format (-o)."); 1538 explicit_bzero(passphrase, strlen(passphrase)); 1539 sshkey_free(private); 1540 exit(1); 1541 } 1542 if (comment) 1543 printf("Old comment: %s\n", comment); 1544 else 1545 printf("No existing comment\n"); 1546 1547 if (identity_comment) { 1548 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1549 } else { 1550 printf("New comment: "); 1551 fflush(stdout); 1552 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1553 explicit_bzero(passphrase, strlen(passphrase)); 1554 sshkey_free(private); 1555 exit(1); 1556 } 1557 new_comment[strcspn(new_comment, "\n")] = '\0'; 1558 } 1559 if (comment != NULL && strcmp(comment, new_comment) == 0) { 1560 printf("No change to comment\n"); 1561 free(passphrase); 1562 sshkey_free(private); 1563 free(comment); 1564 exit(0); 1565 } 1566 1567 /* Save the file using the new passphrase. */ 1568 if ((r = sshkey_save_private(private, identity_file, passphrase, 1569 new_comment, private_key_format, openssh_format_cipher, 1570 rounds)) != 0) { 1571 error("Saving key \"%s\" failed: %s", 1572 identity_file, ssh_err(r)); 1573 freezero(passphrase, strlen(passphrase)); 1574 sshkey_free(private); 1575 free(comment); 1576 exit(1); 1577 } 1578 freezero(passphrase, strlen(passphrase)); 1579 if ((r = sshkey_from_private(private, &public)) != 0) 1580 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1581 sshkey_free(private); 1582 1583 strlcat(identity_file, ".pub", sizeof(identity_file)); 1584 if ((r = sshkey_save_public(public, identity_file, new_comment)) != 0) { 1585 fatal("Unable to save public key to %s: %s", 1586 identity_file, ssh_err(r)); 1587 } 1588 sshkey_free(public); 1589 free(comment); 1590 1591 if (strlen(new_comment) > 0) 1592 printf("Comment '%s' applied\n", new_comment); 1593 else 1594 printf("Comment removed\n"); 1595 1596 exit(0); 1597 } 1598 1599 static void 1600 add_flag_option(struct sshbuf *c, const char *name) 1601 { 1602 int r; 1603 1604 debug3("%s: %s", __func__, name); 1605 if ((r = sshbuf_put_cstring(c, name)) != 0 || 1606 (r = sshbuf_put_string(c, NULL, 0)) != 0) 1607 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1608 } 1609 1610 static void 1611 add_string_option(struct sshbuf *c, const char *name, const char *value) 1612 { 1613 struct sshbuf *b; 1614 int r; 1615 1616 debug3("%s: %s=%s", __func__, name, value); 1617 if ((b = sshbuf_new()) == NULL) 1618 fatal("%s: sshbuf_new failed", __func__); 1619 if ((r = sshbuf_put_cstring(b, value)) != 0 || 1620 (r = sshbuf_put_cstring(c, name)) != 0 || 1621 (r = sshbuf_put_stringb(c, b)) != 0) 1622 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1623 1624 sshbuf_free(b); 1625 } 1626 1627 #define OPTIONS_CRITICAL 1 1628 #define OPTIONS_EXTENSIONS 2 1629 static void 1630 prepare_options_buf(struct sshbuf *c, int which) 1631 { 1632 size_t i; 1633 1634 sshbuf_reset(c); 1635 if ((which & OPTIONS_CRITICAL) != 0 && 1636 certflags_command != NULL) 1637 add_string_option(c, "force-command", certflags_command); 1638 if ((which & OPTIONS_EXTENSIONS) != 0 && 1639 (certflags_flags & CERTOPT_X_FWD) != 0) 1640 add_flag_option(c, "permit-X11-forwarding"); 1641 if ((which & OPTIONS_EXTENSIONS) != 0 && 1642 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1643 add_flag_option(c, "permit-agent-forwarding"); 1644 if ((which & OPTIONS_EXTENSIONS) != 0 && 1645 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1646 add_flag_option(c, "permit-port-forwarding"); 1647 if ((which & OPTIONS_EXTENSIONS) != 0 && 1648 (certflags_flags & CERTOPT_PTY) != 0) 1649 add_flag_option(c, "permit-pty"); 1650 if ((which & OPTIONS_EXTENSIONS) != 0 && 1651 (certflags_flags & CERTOPT_USER_RC) != 0) 1652 add_flag_option(c, "permit-user-rc"); 1653 if ((which & OPTIONS_EXTENSIONS) != 0 && 1654 (certflags_flags & CERTOPT_NO_REQUIRE_USER_PRESENCE) != 0) 1655 add_flag_option(c, "no-touch-required"); 1656 if ((which & OPTIONS_CRITICAL) != 0 && 1657 certflags_src_addr != NULL) 1658 add_string_option(c, "source-address", certflags_src_addr); 1659 for (i = 0; i < ncert_userext; i++) { 1660 if ((cert_userext[i].crit && (which & OPTIONS_EXTENSIONS)) || 1661 (!cert_userext[i].crit && (which & OPTIONS_CRITICAL))) 1662 continue; 1663 if (cert_userext[i].val == NULL) 1664 add_flag_option(c, cert_userext[i].key); 1665 else { 1666 add_string_option(c, cert_userext[i].key, 1667 cert_userext[i].val); 1668 } 1669 } 1670 } 1671 1672 static struct sshkey * 1673 load_pkcs11_key(char *path) 1674 { 1675 #ifdef ENABLE_PKCS11 1676 struct sshkey **keys = NULL, *public, *private = NULL; 1677 int r, i, nkeys; 1678 1679 if ((r = sshkey_load_public(path, &public, NULL)) != 0) 1680 fatal("Couldn't load CA public key \"%s\": %s", 1681 path, ssh_err(r)); 1682 1683 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, 1684 &keys, NULL); 1685 debug3("%s: %d keys", __func__, nkeys); 1686 if (nkeys <= 0) 1687 fatal("cannot read public key from pkcs11"); 1688 for (i = 0; i < nkeys; i++) { 1689 if (sshkey_equal_public(public, keys[i])) { 1690 private = keys[i]; 1691 continue; 1692 } 1693 sshkey_free(keys[i]); 1694 } 1695 free(keys); 1696 sshkey_free(public); 1697 return private; 1698 #else 1699 fatal("no pkcs11 support"); 1700 #endif /* ENABLE_PKCS11 */ 1701 } 1702 1703 /* Signer for sshkey_certify_custom that uses the agent */ 1704 static int 1705 agent_signer(struct sshkey *key, u_char **sigp, size_t *lenp, 1706 const u_char *data, size_t datalen, 1707 const char *alg, const char *provider, u_int compat, void *ctx) 1708 { 1709 int *agent_fdp = (int *)ctx; 1710 1711 return ssh_agent_sign(*agent_fdp, key, sigp, lenp, 1712 data, datalen, alg, compat); 1713 } 1714 1715 static void 1716 do_ca_sign(struct passwd *pw, const char *ca_key_path, int prefer_agent, 1717 unsigned long long cert_serial, int cert_serial_autoinc, 1718 int argc, char **argv) 1719 { 1720 int r, i, found, agent_fd = -1; 1721 u_int n; 1722 struct sshkey *ca, *public; 1723 char valid[64], *otmp, *tmp, *cp, *out, *comment; 1724 char *ca_fp = NULL, **plist = NULL; 1725 struct ssh_identitylist *agent_ids; 1726 size_t j; 1727 struct notifier_ctx *notifier = NULL; 1728 1729 #ifdef ENABLE_PKCS11 1730 pkcs11_init(1); 1731 #endif 1732 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1733 if (pkcs11provider != NULL) { 1734 /* If a PKCS#11 token was specified then try to use it */ 1735 if ((ca = load_pkcs11_key(tmp)) == NULL) 1736 fatal("No PKCS#11 key matching %s found", ca_key_path); 1737 } else if (prefer_agent) { 1738 /* 1739 * Agent signature requested. Try to use agent after making 1740 * sure the public key specified is actually present in the 1741 * agent. 1742 */ 1743 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 1744 fatal("Cannot load CA public key %s: %s", 1745 tmp, ssh_err(r)); 1746 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 1747 fatal("Cannot use public key for CA signature: %s", 1748 ssh_err(r)); 1749 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0) 1750 fatal("Retrieve agent key list: %s", ssh_err(r)); 1751 found = 0; 1752 for (j = 0; j < agent_ids->nkeys; j++) { 1753 if (sshkey_equal(ca, agent_ids->keys[j])) { 1754 found = 1; 1755 break; 1756 } 1757 } 1758 if (!found) 1759 fatal("CA key %s not found in agent", tmp); 1760 ssh_free_identitylist(agent_ids); 1761 ca->flags |= SSHKEY_FLAG_EXT; 1762 } else { 1763 /* CA key is assumed to be a private key on the filesystem */ 1764 ca = load_identity(tmp, NULL); 1765 } 1766 free(tmp); 1767 1768 if (key_type_name != NULL) { 1769 if (sshkey_type_from_name(key_type_name) != ca->type) { 1770 fatal("CA key type %s doesn't match specified %s", 1771 sshkey_ssh_name(ca), key_type_name); 1772 } 1773 } else if (ca->type == KEY_RSA) { 1774 /* Default to a good signature algorithm */ 1775 key_type_name = "rsa-sha2-512"; 1776 } 1777 ca_fp = sshkey_fingerprint(ca, fingerprint_hash, SSH_FP_DEFAULT); 1778 1779 for (i = 0; i < argc; i++) { 1780 /* Split list of principals */ 1781 n = 0; 1782 if (cert_principals != NULL) { 1783 otmp = tmp = xstrdup(cert_principals); 1784 plist = NULL; 1785 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1786 plist = xreallocarray(plist, n + 1, sizeof(*plist)); 1787 if (*(plist[n] = xstrdup(cp)) == '\0') 1788 fatal("Empty principal name"); 1789 } 1790 free(otmp); 1791 } 1792 if (n > SSHKEY_CERT_MAX_PRINCIPALS) 1793 fatal("Too many certificate principals specified"); 1794 1795 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1796 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0) 1797 fatal("%s: unable to open \"%s\": %s", 1798 __func__, tmp, ssh_err(r)); 1799 if (sshkey_is_cert(public)) 1800 fatal("%s: key \"%s\" type %s cannot be certified", 1801 __func__, tmp, sshkey_type(public)); 1802 1803 /* Prepare certificate to sign */ 1804 if ((r = sshkey_to_certified(public)) != 0) 1805 fatal("Could not upgrade key %s to certificate: %s", 1806 tmp, ssh_err(r)); 1807 public->cert->type = cert_key_type; 1808 public->cert->serial = (u_int64_t)cert_serial; 1809 public->cert->key_id = xstrdup(cert_key_id); 1810 public->cert->nprincipals = n; 1811 public->cert->principals = plist; 1812 public->cert->valid_after = cert_valid_from; 1813 public->cert->valid_before = cert_valid_to; 1814 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL); 1815 prepare_options_buf(public->cert->extensions, 1816 OPTIONS_EXTENSIONS); 1817 if ((r = sshkey_from_private(ca, 1818 &public->cert->signature_key)) != 0) 1819 fatal("sshkey_from_private (ca key): %s", ssh_err(r)); 1820 1821 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) { 1822 if ((r = sshkey_certify_custom(public, ca, 1823 key_type_name, sk_provider, agent_signer, 1824 &agent_fd)) != 0) 1825 fatal("Couldn't certify key %s via agent: %s", 1826 tmp, ssh_err(r)); 1827 } else { 1828 if (sshkey_is_sk(ca) && 1829 (ca->sk_flags & SSH_SK_USER_PRESENCE_REQD)) { 1830 notifier = notify_start(0, 1831 "Confirm user presence for key %s %s", 1832 sshkey_type(ca), ca_fp); 1833 } 1834 r = sshkey_certify(public, ca, key_type_name, 1835 sk_provider); 1836 notify_complete(notifier); 1837 if (r != 0) 1838 fatal("Couldn't certify key %s: %s", 1839 tmp, ssh_err(r)); 1840 } 1841 1842 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1843 *cp = '\0'; 1844 xasprintf(&out, "%s-cert.pub", tmp); 1845 free(tmp); 1846 1847 if ((r = sshkey_save_public(public, out, comment)) != 0) { 1848 fatal("Unable to save public key to %s: %s", 1849 identity_file, ssh_err(r)); 1850 } 1851 1852 if (!quiet) { 1853 sshkey_format_cert_validity(public->cert, 1854 valid, sizeof(valid)); 1855 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1856 "valid %s", sshkey_cert_type(public), 1857 out, public->cert->key_id, 1858 (unsigned long long)public->cert->serial, 1859 cert_principals != NULL ? " for " : "", 1860 cert_principals != NULL ? cert_principals : "", 1861 valid); 1862 } 1863 1864 sshkey_free(public); 1865 free(out); 1866 if (cert_serial_autoinc) 1867 cert_serial++; 1868 } 1869 free(ca_fp); 1870 #ifdef ENABLE_PKCS11 1871 pkcs11_terminate(); 1872 #endif 1873 exit(0); 1874 } 1875 1876 static u_int64_t 1877 parse_relative_time(const char *s, time_t now) 1878 { 1879 int64_t mul, secs; 1880 1881 mul = *s == '-' ? -1 : 1; 1882 1883 if ((secs = convtime(s + 1)) == -1) 1884 fatal("Invalid relative certificate time %s", s); 1885 if (mul == -1 && secs > now) 1886 fatal("Certificate time %s cannot be represented", s); 1887 return now + (u_int64_t)(secs * mul); 1888 } 1889 1890 static void 1891 parse_cert_times(char *timespec) 1892 { 1893 char *from, *to; 1894 time_t now = time(NULL); 1895 int64_t secs; 1896 1897 /* +timespec relative to now */ 1898 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1899 if ((secs = convtime(timespec + 1)) == -1) 1900 fatal("Invalid relative certificate life %s", timespec); 1901 cert_valid_to = now + secs; 1902 /* 1903 * Backdate certificate one minute to avoid problems on hosts 1904 * with poorly-synchronised clocks. 1905 */ 1906 cert_valid_from = ((now - 59)/ 60) * 60; 1907 return; 1908 } 1909 1910 /* 1911 * from:to, where 1912 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "always" 1913 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "forever" 1914 */ 1915 from = xstrdup(timespec); 1916 to = strchr(from, ':'); 1917 if (to == NULL || from == to || *(to + 1) == '\0') 1918 fatal("Invalid certificate life specification %s", timespec); 1919 *to++ = '\0'; 1920 1921 if (*from == '-' || *from == '+') 1922 cert_valid_from = parse_relative_time(from, now); 1923 else if (strcmp(from, "always") == 0) 1924 cert_valid_from = 0; 1925 else if (parse_absolute_time(from, &cert_valid_from) != 0) 1926 fatal("Invalid from time \"%s\"", from); 1927 1928 if (*to == '-' || *to == '+') 1929 cert_valid_to = parse_relative_time(to, now); 1930 else if (strcmp(to, "forever") == 0) 1931 cert_valid_to = ~(u_int64_t)0; 1932 else if (parse_absolute_time(to, &cert_valid_to) != 0) 1933 fatal("Invalid to time \"%s\"", to); 1934 1935 if (cert_valid_to <= cert_valid_from) 1936 fatal("Empty certificate validity interval"); 1937 free(from); 1938 } 1939 1940 static void 1941 add_cert_option(char *opt) 1942 { 1943 char *val, *cp; 1944 int iscrit = 0; 1945 1946 if (strcasecmp(opt, "clear") == 0) 1947 certflags_flags = 0; 1948 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1949 certflags_flags &= ~CERTOPT_X_FWD; 1950 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1951 certflags_flags |= CERTOPT_X_FWD; 1952 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1953 certflags_flags &= ~CERTOPT_AGENT_FWD; 1954 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1955 certflags_flags |= CERTOPT_AGENT_FWD; 1956 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1957 certflags_flags &= ~CERTOPT_PORT_FWD; 1958 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1959 certflags_flags |= CERTOPT_PORT_FWD; 1960 else if (strcasecmp(opt, "no-pty") == 0) 1961 certflags_flags &= ~CERTOPT_PTY; 1962 else if (strcasecmp(opt, "permit-pty") == 0) 1963 certflags_flags |= CERTOPT_PTY; 1964 else if (strcasecmp(opt, "no-user-rc") == 0) 1965 certflags_flags &= ~CERTOPT_USER_RC; 1966 else if (strcasecmp(opt, "permit-user-rc") == 0) 1967 certflags_flags |= CERTOPT_USER_RC; 1968 else if (strcasecmp(opt, "touch-required") == 0) 1969 certflags_flags &= ~CERTOPT_NO_REQUIRE_USER_PRESENCE; 1970 else if (strcasecmp(opt, "no-touch-required") == 0) 1971 certflags_flags |= CERTOPT_NO_REQUIRE_USER_PRESENCE; 1972 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1973 val = opt + 14; 1974 if (*val == '\0') 1975 fatal("Empty force-command option"); 1976 if (certflags_command != NULL) 1977 fatal("force-command already specified"); 1978 certflags_command = xstrdup(val); 1979 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1980 val = opt + 15; 1981 if (*val == '\0') 1982 fatal("Empty source-address option"); 1983 if (certflags_src_addr != NULL) 1984 fatal("source-address already specified"); 1985 if (addr_match_cidr_list(NULL, val) != 0) 1986 fatal("Invalid source-address list"); 1987 certflags_src_addr = xstrdup(val); 1988 } else if (strncasecmp(opt, "extension:", 10) == 0 || 1989 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) { 1990 val = xstrdup(strchr(opt, ':') + 1); 1991 if ((cp = strchr(val, '=')) != NULL) 1992 *cp++ = '\0'; 1993 cert_userext = xreallocarray(cert_userext, ncert_userext + 1, 1994 sizeof(*cert_userext)); 1995 cert_userext[ncert_userext].key = val; 1996 cert_userext[ncert_userext].val = cp == NULL ? 1997 NULL : xstrdup(cp); 1998 cert_userext[ncert_userext].crit = iscrit; 1999 ncert_userext++; 2000 } else 2001 fatal("Unsupported certificate option \"%s\"", opt); 2002 } 2003 2004 static void 2005 show_options(struct sshbuf *optbuf, int in_critical) 2006 { 2007 char *name, *arg; 2008 struct sshbuf *options, *option = NULL; 2009 int r; 2010 2011 if ((options = sshbuf_fromb(optbuf)) == NULL) 2012 fatal("%s: sshbuf_fromb failed", __func__); 2013 while (sshbuf_len(options) != 0) { 2014 sshbuf_free(option); 2015 option = NULL; 2016 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 || 2017 (r = sshbuf_froms(options, &option)) != 0) 2018 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 2019 printf(" %s", name); 2020 if (!in_critical && 2021 (strcmp(name, "permit-X11-forwarding") == 0 || 2022 strcmp(name, "permit-agent-forwarding") == 0 || 2023 strcmp(name, "permit-port-forwarding") == 0 || 2024 strcmp(name, "permit-pty") == 0 || 2025 strcmp(name, "permit-user-rc") == 0 || 2026 strcmp(name, "no-touch-required") == 0)) { 2027 printf("\n"); 2028 } else if (in_critical && 2029 (strcmp(name, "force-command") == 0 || 2030 strcmp(name, "source-address") == 0)) { 2031 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0) 2032 fatal("%s: buffer error: %s", 2033 __func__, ssh_err(r)); 2034 printf(" %s\n", arg); 2035 free(arg); 2036 } else { 2037 printf(" UNKNOWN OPTION (len %zu)\n", 2038 sshbuf_len(option)); 2039 sshbuf_reset(option); 2040 } 2041 free(name); 2042 if (sshbuf_len(option) != 0) 2043 fatal("Option corrupt: extra data at end"); 2044 } 2045 sshbuf_free(option); 2046 sshbuf_free(options); 2047 } 2048 2049 static void 2050 print_cert(struct sshkey *key) 2051 { 2052 char valid[64], *key_fp, *ca_fp; 2053 u_int i; 2054 2055 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT); 2056 ca_fp = sshkey_fingerprint(key->cert->signature_key, 2057 fingerprint_hash, SSH_FP_DEFAULT); 2058 if (key_fp == NULL || ca_fp == NULL) 2059 fatal("%s: sshkey_fingerprint fail", __func__); 2060 sshkey_format_cert_validity(key->cert, valid, sizeof(valid)); 2061 2062 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key), 2063 sshkey_cert_type(key)); 2064 printf(" Public key: %s %s\n", sshkey_type(key), key_fp); 2065 printf(" Signing CA: %s %s (using %s)\n", 2066 sshkey_type(key->cert->signature_key), ca_fp, 2067 key->cert->signature_type); 2068 printf(" Key ID: \"%s\"\n", key->cert->key_id); 2069 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial); 2070 printf(" Valid: %s\n", valid); 2071 printf(" Principals: "); 2072 if (key->cert->nprincipals == 0) 2073 printf("(none)\n"); 2074 else { 2075 for (i = 0; i < key->cert->nprincipals; i++) 2076 printf("\n %s", 2077 key->cert->principals[i]); 2078 printf("\n"); 2079 } 2080 printf(" Critical Options: "); 2081 if (sshbuf_len(key->cert->critical) == 0) 2082 printf("(none)\n"); 2083 else { 2084 printf("\n"); 2085 show_options(key->cert->critical, 1); 2086 } 2087 printf(" Extensions: "); 2088 if (sshbuf_len(key->cert->extensions) == 0) 2089 printf("(none)\n"); 2090 else { 2091 printf("\n"); 2092 show_options(key->cert->extensions, 0); 2093 } 2094 } 2095 2096 static void 2097 do_show_cert(struct passwd *pw) 2098 { 2099 struct sshkey *key = NULL; 2100 struct stat st; 2101 int r, is_stdin = 0, ok = 0; 2102 FILE *f; 2103 char *cp, *line = NULL; 2104 const char *path; 2105 size_t linesize = 0; 2106 u_long lnum = 0; 2107 2108 if (!have_identity) 2109 ask_filename(pw, "Enter file in which the key is"); 2110 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) == -1) 2111 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 2112 2113 path = identity_file; 2114 if (strcmp(path, "-") == 0) { 2115 f = stdin; 2116 path = "(stdin)"; 2117 is_stdin = 1; 2118 } else if ((f = fopen(identity_file, "r")) == NULL) 2119 fatal("fopen %s: %s", identity_file, strerror(errno)); 2120 2121 while (getline(&line, &linesize, f) != -1) { 2122 lnum++; 2123 sshkey_free(key); 2124 key = NULL; 2125 /* Trim leading space and comments */ 2126 cp = line + strspn(line, " \t"); 2127 if (*cp == '#' || *cp == '\0') 2128 continue; 2129 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2130 fatal("sshkey_new"); 2131 if ((r = sshkey_read(key, &cp)) != 0) { 2132 error("%s:%lu: invalid key: %s", path, 2133 lnum, ssh_err(r)); 2134 continue; 2135 } 2136 if (!sshkey_is_cert(key)) { 2137 error("%s:%lu is not a certificate", path, lnum); 2138 continue; 2139 } 2140 ok = 1; 2141 if (!is_stdin && lnum == 1) 2142 printf("%s:\n", path); 2143 else 2144 printf("%s:%lu:\n", path, lnum); 2145 print_cert(key); 2146 } 2147 free(line); 2148 sshkey_free(key); 2149 fclose(f); 2150 exit(ok ? 0 : 1); 2151 } 2152 2153 static void 2154 load_krl(const char *path, struct ssh_krl **krlp) 2155 { 2156 struct sshbuf *krlbuf; 2157 int r; 2158 2159 if ((r = sshbuf_load_file(path, &krlbuf)) != 0) 2160 fatal("Unable to load KRL: %s", ssh_err(r)); 2161 /* XXX check sigs */ 2162 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 || 2163 *krlp == NULL) 2164 fatal("Invalid KRL file: %s", ssh_err(r)); 2165 sshbuf_free(krlbuf); 2166 } 2167 2168 static void 2169 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp, 2170 const char *file, u_long lnum) 2171 { 2172 char *tmp; 2173 size_t tlen; 2174 struct sshbuf *b; 2175 int r; 2176 2177 if (strncmp(cp, "SHA256:", 7) != 0) 2178 fatal("%s:%lu: unsupported hash algorithm", file, lnum); 2179 cp += 7; 2180 2181 /* 2182 * OpenSSH base64 hashes omit trailing '=' 2183 * characters; put them back for decode. 2184 */ 2185 tlen = strlen(cp); 2186 tmp = xmalloc(tlen + 4 + 1); 2187 strlcpy(tmp, cp, tlen + 1); 2188 while ((tlen % 4) != 0) { 2189 tmp[tlen++] = '='; 2190 tmp[tlen] = '\0'; 2191 } 2192 if ((b = sshbuf_new()) == NULL) 2193 fatal("%s: sshbuf_new failed", __func__); 2194 if ((r = sshbuf_b64tod(b, tmp)) != 0) 2195 fatal("%s:%lu: decode hash failed: %s", file, lnum, ssh_err(r)); 2196 free(tmp); 2197 *lenp = sshbuf_len(b); 2198 *blobp = xmalloc(*lenp); 2199 memcpy(*blobp, sshbuf_ptr(b), *lenp); 2200 sshbuf_free(b); 2201 } 2202 2203 static void 2204 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca, 2205 const struct sshkey *ca, struct ssh_krl *krl) 2206 { 2207 struct sshkey *key = NULL; 2208 u_long lnum = 0; 2209 char *path, *cp, *ep, *line = NULL; 2210 u_char *blob = NULL; 2211 size_t blen = 0, linesize = 0; 2212 unsigned long long serial, serial2; 2213 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r; 2214 FILE *krl_spec; 2215 2216 path = tilde_expand_filename(file, pw->pw_uid); 2217 if (strcmp(path, "-") == 0) { 2218 krl_spec = stdin; 2219 free(path); 2220 path = xstrdup("(standard input)"); 2221 } else if ((krl_spec = fopen(path, "r")) == NULL) 2222 fatal("fopen %s: %s", path, strerror(errno)); 2223 2224 if (!quiet) 2225 printf("Revoking from %s\n", path); 2226 while (getline(&line, &linesize, krl_spec) != -1) { 2227 lnum++; 2228 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0; 2229 cp = line + strspn(line, " \t"); 2230 /* Trim trailing space, comments and strip \n */ 2231 for (i = 0, r = -1; cp[i] != '\0'; i++) { 2232 if (cp[i] == '#' || cp[i] == '\n') { 2233 cp[i] = '\0'; 2234 break; 2235 } 2236 if (cp[i] == ' ' || cp[i] == '\t') { 2237 /* Remember the start of a span of whitespace */ 2238 if (r == -1) 2239 r = i; 2240 } else 2241 r = -1; 2242 } 2243 if (r != -1) 2244 cp[r] = '\0'; 2245 if (*cp == '\0') 2246 continue; 2247 if (strncasecmp(cp, "serial:", 7) == 0) { 2248 if (ca == NULL && !wild_ca) { 2249 fatal("revoking certificates by serial number " 2250 "requires specification of a CA key"); 2251 } 2252 cp += 7; 2253 cp = cp + strspn(cp, " \t"); 2254 errno = 0; 2255 serial = strtoull(cp, &ep, 0); 2256 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 2257 fatal("%s:%lu: invalid serial \"%s\"", 2258 path, lnum, cp); 2259 if (errno == ERANGE && serial == ULLONG_MAX) 2260 fatal("%s:%lu: serial out of range", 2261 path, lnum); 2262 serial2 = serial; 2263 if (*ep == '-') { 2264 cp = ep + 1; 2265 errno = 0; 2266 serial2 = strtoull(cp, &ep, 0); 2267 if (*cp == '\0' || *ep != '\0') 2268 fatal("%s:%lu: invalid serial \"%s\"", 2269 path, lnum, cp); 2270 if (errno == ERANGE && serial2 == ULLONG_MAX) 2271 fatal("%s:%lu: serial out of range", 2272 path, lnum); 2273 if (serial2 <= serial) 2274 fatal("%s:%lu: invalid serial range " 2275 "%llu:%llu", path, lnum, 2276 (unsigned long long)serial, 2277 (unsigned long long)serial2); 2278 } 2279 if (ssh_krl_revoke_cert_by_serial_range(krl, 2280 ca, serial, serial2) != 0) { 2281 fatal("%s: revoke serial failed", 2282 __func__); 2283 } 2284 } else if (strncasecmp(cp, "id:", 3) == 0) { 2285 if (ca == NULL && !wild_ca) { 2286 fatal("revoking certificates by key ID " 2287 "requires specification of a CA key"); 2288 } 2289 cp += 3; 2290 cp = cp + strspn(cp, " \t"); 2291 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2292 fatal("%s: revoke key ID failed", __func__); 2293 } else if (strncasecmp(cp, "hash:", 5) == 0) { 2294 cp += 5; 2295 cp = cp + strspn(cp, " \t"); 2296 hash_to_blob(cp, &blob, &blen, file, lnum); 2297 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2298 if (r != 0) 2299 fatal("%s: revoke key failed: %s", 2300 __func__, ssh_err(r)); 2301 } else { 2302 if (strncasecmp(cp, "key:", 4) == 0) { 2303 cp += 4; 2304 cp = cp + strspn(cp, " \t"); 2305 was_explicit_key = 1; 2306 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2307 cp += 5; 2308 cp = cp + strspn(cp, " \t"); 2309 was_sha1 = 1; 2310 } else if (strncasecmp(cp, "sha256:", 7) == 0) { 2311 cp += 7; 2312 cp = cp + strspn(cp, " \t"); 2313 was_sha256 = 1; 2314 /* 2315 * Just try to process the line as a key. 2316 * Parsing will fail if it isn't. 2317 */ 2318 } 2319 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2320 fatal("sshkey_new"); 2321 if ((r = sshkey_read(key, &cp)) != 0) 2322 fatal("%s:%lu: invalid key: %s", 2323 path, lnum, ssh_err(r)); 2324 if (was_explicit_key) 2325 r = ssh_krl_revoke_key_explicit(krl, key); 2326 else if (was_sha1) { 2327 if (sshkey_fingerprint_raw(key, 2328 SSH_DIGEST_SHA1, &blob, &blen) != 0) { 2329 fatal("%s:%lu: fingerprint failed", 2330 file, lnum); 2331 } 2332 r = ssh_krl_revoke_key_sha1(krl, blob, blen); 2333 } else if (was_sha256) { 2334 if (sshkey_fingerprint_raw(key, 2335 SSH_DIGEST_SHA256, &blob, &blen) != 0) { 2336 fatal("%s:%lu: fingerprint failed", 2337 file, lnum); 2338 } 2339 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2340 } else 2341 r = ssh_krl_revoke_key(krl, key); 2342 if (r != 0) 2343 fatal("%s: revoke key failed: %s", 2344 __func__, ssh_err(r)); 2345 freezero(blob, blen); 2346 blob = NULL; 2347 blen = 0; 2348 sshkey_free(key); 2349 } 2350 } 2351 if (strcmp(path, "-") != 0) 2352 fclose(krl_spec); 2353 free(line); 2354 free(path); 2355 } 2356 2357 static void 2358 do_gen_krl(struct passwd *pw, int updating, const char *ca_key_path, 2359 unsigned long long krl_version, const char *krl_comment, 2360 int argc, char **argv) 2361 { 2362 struct ssh_krl *krl; 2363 struct stat sb; 2364 struct sshkey *ca = NULL; 2365 int i, r, wild_ca = 0; 2366 char *tmp; 2367 struct sshbuf *kbuf; 2368 2369 if (*identity_file == '\0') 2370 fatal("KRL generation requires an output file"); 2371 if (stat(identity_file, &sb) == -1) { 2372 if (errno != ENOENT) 2373 fatal("Cannot access KRL \"%s\": %s", 2374 identity_file, strerror(errno)); 2375 if (updating) 2376 fatal("KRL \"%s\" does not exist", identity_file); 2377 } 2378 if (ca_key_path != NULL) { 2379 if (strcasecmp(ca_key_path, "none") == 0) 2380 wild_ca = 1; 2381 else { 2382 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2383 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 2384 fatal("Cannot load CA public key %s: %s", 2385 tmp, ssh_err(r)); 2386 free(tmp); 2387 } 2388 } 2389 2390 if (updating) 2391 load_krl(identity_file, &krl); 2392 else if ((krl = ssh_krl_init()) == NULL) 2393 fatal("couldn't create KRL"); 2394 2395 if (krl_version != 0) 2396 ssh_krl_set_version(krl, krl_version); 2397 if (krl_comment != NULL) 2398 ssh_krl_set_comment(krl, krl_comment); 2399 2400 for (i = 0; i < argc; i++) 2401 update_krl_from_file(pw, argv[i], wild_ca, ca, krl); 2402 2403 if ((kbuf = sshbuf_new()) == NULL) 2404 fatal("sshbuf_new failed"); 2405 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0) 2406 fatal("Couldn't generate KRL"); 2407 if ((r = sshbuf_write_file(identity_file, kbuf)) != 0) 2408 fatal("write %s: %s", identity_file, strerror(errno)); 2409 sshbuf_free(kbuf); 2410 ssh_krl_free(krl); 2411 sshkey_free(ca); 2412 } 2413 2414 static void 2415 do_check_krl(struct passwd *pw, int print_krl, int argc, char **argv) 2416 { 2417 int i, r, ret = 0; 2418 char *comment; 2419 struct ssh_krl *krl; 2420 struct sshkey *k; 2421 2422 if (*identity_file == '\0') 2423 fatal("KRL checking requires an input file"); 2424 load_krl(identity_file, &krl); 2425 if (print_krl) 2426 krl_dump(krl, stdout); 2427 for (i = 0; i < argc; i++) { 2428 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0) 2429 fatal("Cannot load public key %s: %s", 2430 argv[i], ssh_err(r)); 2431 r = ssh_krl_check_key(krl, k); 2432 printf("%s%s%s%s: %s\n", argv[i], 2433 *comment ? " (" : "", comment, *comment ? ")" : "", 2434 r == 0 ? "ok" : "REVOKED"); 2435 if (r != 0) 2436 ret = 1; 2437 sshkey_free(k); 2438 free(comment); 2439 } 2440 ssh_krl_free(krl); 2441 exit(ret); 2442 } 2443 2444 static struct sshkey * 2445 load_sign_key(const char *keypath, const struct sshkey *pubkey) 2446 { 2447 size_t i, slen, plen = strlen(keypath); 2448 char *privpath = xstrdup(keypath); 2449 const char *suffixes[] = { "-cert.pub", ".pub", NULL }; 2450 struct sshkey *ret = NULL, *privkey = NULL; 2451 int r; 2452 2453 /* 2454 * If passed a public key filename, then try to locate the corresponding 2455 * private key. This lets us specify certificates on the command-line 2456 * and have ssh-keygen find the appropriate private key. 2457 */ 2458 for (i = 0; suffixes[i]; i++) { 2459 slen = strlen(suffixes[i]); 2460 if (plen <= slen || 2461 strcmp(privpath + plen - slen, suffixes[i]) != 0) 2462 continue; 2463 privpath[plen - slen] = '\0'; 2464 debug("%s: %s looks like a public key, using private key " 2465 "path %s instead", __func__, keypath, privpath); 2466 } 2467 if ((privkey = load_identity(privpath, NULL)) == NULL) { 2468 error("Couldn't load identity %s", keypath); 2469 goto done; 2470 } 2471 if (!sshkey_equal_public(pubkey, privkey)) { 2472 error("Public key %s doesn't match private %s", 2473 keypath, privpath); 2474 goto done; 2475 } 2476 if (sshkey_is_cert(pubkey) && !sshkey_is_cert(privkey)) { 2477 /* 2478 * Graft the certificate onto the private key to make 2479 * it capable of signing. 2480 */ 2481 if ((r = sshkey_to_certified(privkey)) != 0) { 2482 error("%s: sshkey_to_certified: %s", __func__, 2483 ssh_err(r)); 2484 goto done; 2485 } 2486 if ((r = sshkey_cert_copy(pubkey, privkey)) != 0) { 2487 error("%s: sshkey_cert_copy: %s", __func__, ssh_err(r)); 2488 goto done; 2489 } 2490 } 2491 /* success */ 2492 ret = privkey; 2493 privkey = NULL; 2494 done: 2495 sshkey_free(privkey); 2496 free(privpath); 2497 return ret; 2498 } 2499 2500 static int 2501 sign_one(struct sshkey *signkey, const char *filename, int fd, 2502 const char *sig_namespace, sshsig_signer *signer, void *signer_ctx) 2503 { 2504 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2505 int r = SSH_ERR_INTERNAL_ERROR, wfd = -1, oerrno; 2506 char *wfile = NULL, *asig = NULL, *fp = NULL; 2507 2508 if (!quiet) { 2509 if (fd == STDIN_FILENO) 2510 fprintf(stderr, "Signing data on standard input\n"); 2511 else 2512 fprintf(stderr, "Signing file %s\n", filename); 2513 } 2514 if (signer == NULL && sshkey_is_sk(signkey) && 2515 (signkey->sk_flags & SSH_SK_USER_PRESENCE_REQD)) { 2516 if ((fp = sshkey_fingerprint(signkey, fingerprint_hash, 2517 SSH_FP_DEFAULT)) == NULL) 2518 fatal("%s: sshkey_fingerprint failed", __func__); 2519 fprintf(stderr, "Confirm user presence for key %s %s\n", 2520 sshkey_type(signkey), fp); 2521 free(fp); 2522 } 2523 if ((r = sshsig_sign_fd(signkey, NULL, sk_provider, fd, sig_namespace, 2524 &sigbuf, signer, signer_ctx)) != 0) { 2525 error("Signing %s failed: %s", filename, ssh_err(r)); 2526 goto out; 2527 } 2528 if ((r = sshsig_armor(sigbuf, &abuf)) != 0) { 2529 error("%s: sshsig_armor: %s", __func__, ssh_err(r)); 2530 goto out; 2531 } 2532 if ((asig = sshbuf_dup_string(abuf)) == NULL) { 2533 error("%s: buffer error", __func__); 2534 r = SSH_ERR_ALLOC_FAIL; 2535 goto out; 2536 } 2537 2538 if (fd == STDIN_FILENO) { 2539 fputs(asig, stdout); 2540 fflush(stdout); 2541 } else { 2542 xasprintf(&wfile, "%s.sig", filename); 2543 if (confirm_overwrite(wfile)) { 2544 if ((wfd = open(wfile, O_WRONLY|O_CREAT|O_TRUNC, 2545 0666)) == -1) { 2546 oerrno = errno; 2547 error("Cannot open %s: %s", 2548 wfile, strerror(errno)); 2549 errno = oerrno; 2550 r = SSH_ERR_SYSTEM_ERROR; 2551 goto out; 2552 } 2553 if (atomicio(vwrite, wfd, asig, 2554 strlen(asig)) != strlen(asig)) { 2555 oerrno = errno; 2556 error("Cannot write to %s: %s", 2557 wfile, strerror(errno)); 2558 errno = oerrno; 2559 r = SSH_ERR_SYSTEM_ERROR; 2560 goto out; 2561 } 2562 if (!quiet) { 2563 fprintf(stderr, "Write signature to %s\n", 2564 wfile); 2565 } 2566 } 2567 } 2568 /* success */ 2569 r = 0; 2570 out: 2571 free(wfile); 2572 free(asig); 2573 sshbuf_free(abuf); 2574 sshbuf_free(sigbuf); 2575 if (wfd != -1) 2576 close(wfd); 2577 return r; 2578 } 2579 2580 static int 2581 sig_sign(const char *keypath, const char *sig_namespace, int argc, char **argv) 2582 { 2583 int i, fd = -1, r, ret = -1; 2584 int agent_fd = -1; 2585 struct sshkey *pubkey = NULL, *privkey = NULL, *signkey = NULL; 2586 sshsig_signer *signer = NULL; 2587 2588 /* Check file arguments. */ 2589 for (i = 0; i < argc; i++) { 2590 if (strcmp(argv[i], "-") != 0) 2591 continue; 2592 if (i > 0 || argc > 1) 2593 fatal("Cannot sign mix of paths and standard input"); 2594 } 2595 2596 if ((r = sshkey_load_public(keypath, &pubkey, NULL)) != 0) { 2597 error("Couldn't load public key %s: %s", keypath, ssh_err(r)); 2598 goto done; 2599 } 2600 2601 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 2602 debug("Couldn't get agent socket: %s", ssh_err(r)); 2603 else { 2604 if ((r = ssh_agent_has_key(agent_fd, pubkey)) == 0) 2605 signer = agent_signer; 2606 else 2607 debug("Couldn't find key in agent: %s", ssh_err(r)); 2608 } 2609 2610 if (signer == NULL) { 2611 /* Not using agent - try to load private key */ 2612 if ((privkey = load_sign_key(keypath, pubkey)) == NULL) 2613 goto done; 2614 signkey = privkey; 2615 } else { 2616 /* Will use key in agent */ 2617 signkey = pubkey; 2618 } 2619 2620 if (argc == 0) { 2621 if ((r = sign_one(signkey, "(stdin)", STDIN_FILENO, 2622 sig_namespace, signer, &agent_fd)) != 0) 2623 goto done; 2624 } else { 2625 for (i = 0; i < argc; i++) { 2626 if (strcmp(argv[i], "-") == 0) 2627 fd = STDIN_FILENO; 2628 else if ((fd = open(argv[i], O_RDONLY)) == -1) { 2629 error("Cannot open %s for signing: %s", 2630 argv[i], strerror(errno)); 2631 goto done; 2632 } 2633 if ((r = sign_one(signkey, argv[i], fd, sig_namespace, 2634 signer, &agent_fd)) != 0) 2635 goto done; 2636 if (fd != STDIN_FILENO) 2637 close(fd); 2638 fd = -1; 2639 } 2640 } 2641 2642 ret = 0; 2643 done: 2644 if (fd != -1 && fd != STDIN_FILENO) 2645 close(fd); 2646 sshkey_free(pubkey); 2647 sshkey_free(privkey); 2648 return ret; 2649 } 2650 2651 static int 2652 sig_verify(const char *signature, const char *sig_namespace, 2653 const char *principal, const char *allowed_keys, const char *revoked_keys) 2654 { 2655 int r, ret = -1; 2656 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2657 struct sshkey *sign_key = NULL; 2658 char *fp = NULL; 2659 struct sshkey_sig_details *sig_details = NULL; 2660 2661 memset(&sig_details, 0, sizeof(sig_details)); 2662 if ((r = sshbuf_load_file(signature, &abuf)) != 0) { 2663 error("Couldn't read signature file: %s", ssh_err(r)); 2664 goto done; 2665 } 2666 2667 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) { 2668 error("%s: sshsig_armor: %s", __func__, ssh_err(r)); 2669 goto done; 2670 } 2671 if ((r = sshsig_verify_fd(sigbuf, STDIN_FILENO, sig_namespace, 2672 &sign_key, &sig_details)) != 0) 2673 goto done; /* sshsig_verify() prints error */ 2674 2675 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash, 2676 SSH_FP_DEFAULT)) == NULL) 2677 fatal("%s: sshkey_fingerprint failed", __func__); 2678 debug("Valid (unverified) signature from key %s", fp); 2679 if (sig_details != NULL) { 2680 debug2("%s: signature details: counter = %u, flags = 0x%02x", 2681 __func__, sig_details->sk_counter, sig_details->sk_flags); 2682 } 2683 free(fp); 2684 fp = NULL; 2685 2686 if (revoked_keys != NULL) { 2687 if ((r = sshkey_check_revoked(sign_key, revoked_keys)) != 0) { 2688 debug3("sshkey_check_revoked failed: %s", ssh_err(r)); 2689 goto done; 2690 } 2691 } 2692 2693 if (allowed_keys != NULL && 2694 (r = sshsig_check_allowed_keys(allowed_keys, sign_key, 2695 principal, sig_namespace)) != 0) { 2696 debug3("sshsig_check_allowed_keys failed: %s", ssh_err(r)); 2697 goto done; 2698 } 2699 /* success */ 2700 ret = 0; 2701 done: 2702 if (!quiet) { 2703 if (ret == 0) { 2704 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash, 2705 SSH_FP_DEFAULT)) == NULL) { 2706 fatal("%s: sshkey_fingerprint failed", 2707 __func__); 2708 } 2709 if (principal == NULL) { 2710 printf("Good \"%s\" signature with %s key %s\n", 2711 sig_namespace, sshkey_type(sign_key), fp); 2712 2713 } else { 2714 printf("Good \"%s\" signature for %s with %s key %s\n", 2715 sig_namespace, principal, 2716 sshkey_type(sign_key), fp); 2717 } 2718 } else { 2719 printf("Could not verify signature.\n"); 2720 } 2721 } 2722 sshbuf_free(sigbuf); 2723 sshbuf_free(abuf); 2724 sshkey_free(sign_key); 2725 sshkey_sig_details_free(sig_details); 2726 free(fp); 2727 return ret; 2728 } 2729 2730 static int 2731 sig_find_principals(const char *signature, const char *allowed_keys) { 2732 int r, ret = -1; 2733 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2734 struct sshkey *sign_key = NULL; 2735 char *principals = NULL, *cp, *tmp; 2736 2737 if ((r = sshbuf_load_file(signature, &abuf)) != 0) { 2738 error("Couldn't read signature file: %s", ssh_err(r)); 2739 goto done; 2740 } 2741 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) { 2742 error("%s: sshsig_armor: %s", __func__, ssh_err(r)); 2743 goto done; 2744 } 2745 if ((r = sshsig_get_pubkey(sigbuf, &sign_key)) != 0) { 2746 error("%s: sshsig_get_pubkey: %s", 2747 __func__, ssh_err(r)); 2748 goto done; 2749 } 2750 if ((r = sshsig_find_principals(allowed_keys, sign_key, 2751 &principals)) != 0) { 2752 error("%s: sshsig_get_principal: %s", 2753 __func__, ssh_err(r)); 2754 goto done; 2755 } 2756 ret = 0; 2757 done: 2758 if (ret == 0 ) { 2759 /* Emit matching principals one per line */ 2760 tmp = principals; 2761 while ((cp = strsep(&tmp, ",")) != NULL && *cp != '\0') 2762 puts(cp); 2763 } else { 2764 fprintf(stderr, "No principal matched.\n"); 2765 } 2766 sshbuf_free(sigbuf); 2767 sshbuf_free(abuf); 2768 sshkey_free(sign_key); 2769 free(principals); 2770 return ret; 2771 } 2772 2773 static void 2774 do_moduli_gen(const char *out_file, char **opts, size_t nopts) 2775 { 2776 #ifdef WITH_OPENSSL 2777 /* Moduli generation/screening */ 2778 u_int32_t memory = 0; 2779 BIGNUM *start = NULL; 2780 int moduli_bits = 0; 2781 FILE *out; 2782 size_t i; 2783 const char *errstr; 2784 2785 /* Parse options */ 2786 for (i = 0; i < nopts; i++) { 2787 if (strncmp(opts[i], "memory=", 7) == 0) { 2788 memory = (u_int32_t)strtonum(opts[i]+7, 1, 2789 UINT_MAX, &errstr); 2790 if (errstr) { 2791 fatal("Memory limit is %s: %s", 2792 errstr, opts[i]+7); 2793 } 2794 } else if (strncmp(opts[i], "start=", 6) == 0) { 2795 /* XXX - also compare length against bits */ 2796 if (BN_hex2bn(&start, opts[i]+6) == 0) 2797 fatal("Invalid start point."); 2798 } else if (strncmp(opts[i], "bits=", 5) == 0) { 2799 moduli_bits = (int)strtonum(opts[i]+5, 1, 2800 INT_MAX, &errstr); 2801 if (errstr) { 2802 fatal("Invalid number: %s (%s)", 2803 opts[i]+12, errstr); 2804 } 2805 } else { 2806 fatal("Option \"%s\" is unsupported for moduli " 2807 "generation", opts[i]); 2808 } 2809 } 2810 2811 if ((out = fopen(out_file, "w")) == NULL) { 2812 fatal("Couldn't open modulus candidate file \"%s\": %s", 2813 out_file, strerror(errno)); 2814 } 2815 setvbuf(out, NULL, _IOLBF, 0); 2816 2817 if (moduli_bits == 0) 2818 moduli_bits = DEFAULT_BITS; 2819 if (gen_candidates(out, memory, moduli_bits, start) != 0) 2820 fatal("modulus candidate generation failed"); 2821 #else /* WITH_OPENSSL */ 2822 fatal("Moduli generation is not supported"); 2823 #endif /* WITH_OPENSSL */ 2824 } 2825 2826 static void 2827 do_moduli_screen(const char *out_file, char **opts, size_t nopts) 2828 { 2829 #ifdef WITH_OPENSSL 2830 /* Moduli generation/screening */ 2831 char *checkpoint = NULL; 2832 u_int32_t generator_wanted = 0; 2833 unsigned long start_lineno = 0, lines_to_process = 0; 2834 int prime_tests = 0; 2835 FILE *out, *in = stdin; 2836 size_t i; 2837 const char *errstr; 2838 2839 /* Parse options */ 2840 for (i = 0; i < nopts; i++) { 2841 if (strncmp(opts[i], "lines=", 6) == 0) { 2842 lines_to_process = strtoul(opts[i]+6, NULL, 10); 2843 } else if (strncmp(opts[i], "start-line=", 11) == 0) { 2844 start_lineno = strtoul(opts[i]+11, NULL, 10); 2845 } else if (strncmp(opts[i], "checkpoint=", 11) == 0) { 2846 checkpoint = xstrdup(opts[i]+11); 2847 } else if (strncmp(opts[i], "generator=", 10) == 0) { 2848 generator_wanted = (u_int32_t)strtonum( 2849 opts[i]+10, 1, UINT_MAX, &errstr); 2850 if (errstr != NULL) { 2851 fatal("Generator invalid: %s (%s)", 2852 opts[i]+10, errstr); 2853 } 2854 } else if (strncmp(opts[i], "prime-tests=", 12) == 0) { 2855 prime_tests = (int)strtonum(opts[i]+12, 1, 2856 INT_MAX, &errstr); 2857 if (errstr) { 2858 fatal("Invalid number: %s (%s)", 2859 opts[i]+12, errstr); 2860 } 2861 } else { 2862 fatal("Option \"%s\" is unsupported for moduli " 2863 "screening", opts[i]); 2864 } 2865 } 2866 2867 if (have_identity && strcmp(identity_file, "-") != 0) { 2868 if ((in = fopen(identity_file, "r")) == NULL) { 2869 fatal("Couldn't open modulus candidate " 2870 "file \"%s\": %s", identity_file, 2871 strerror(errno)); 2872 } 2873 } 2874 2875 if ((out = fopen(out_file, "a")) == NULL) { 2876 fatal("Couldn't open moduli file \"%s\": %s", 2877 out_file, strerror(errno)); 2878 } 2879 setvbuf(out, NULL, _IOLBF, 0); 2880 if (prime_test(in, out, prime_tests == 0 ? 100 : prime_tests, 2881 generator_wanted, checkpoint, 2882 start_lineno, lines_to_process) != 0) 2883 fatal("modulus screening failed"); 2884 #else /* WITH_OPENSSL */ 2885 fatal("Moduli screening is not supported"); 2886 #endif /* WITH_OPENSSL */ 2887 } 2888 2889 static char * 2890 private_key_passphrase(void) 2891 { 2892 char *passphrase1, *passphrase2; 2893 2894 /* Ask for a passphrase (twice). */ 2895 if (identity_passphrase) 2896 passphrase1 = xstrdup(identity_passphrase); 2897 else if (identity_new_passphrase) 2898 passphrase1 = xstrdup(identity_new_passphrase); 2899 else { 2900 passphrase_again: 2901 passphrase1 = 2902 read_passphrase("Enter passphrase (empty for no " 2903 "passphrase): ", RP_ALLOW_STDIN); 2904 passphrase2 = read_passphrase("Enter same passphrase again: ", 2905 RP_ALLOW_STDIN); 2906 if (strcmp(passphrase1, passphrase2) != 0) { 2907 /* 2908 * The passphrases do not match. Clear them and 2909 * retry. 2910 */ 2911 freezero(passphrase1, strlen(passphrase1)); 2912 freezero(passphrase2, strlen(passphrase2)); 2913 printf("Passphrases do not match. Try again.\n"); 2914 goto passphrase_again; 2915 } 2916 /* Clear the other copy of the passphrase. */ 2917 freezero(passphrase2, strlen(passphrase2)); 2918 } 2919 return passphrase1; 2920 } 2921 2922 static const char * 2923 skip_ssh_url_preamble(const char *s) 2924 { 2925 if (strncmp(s, "ssh://", 6) == 0) 2926 return s + 6; 2927 else if (strncmp(s, "ssh:", 4) == 0) 2928 return s + 4; 2929 return s; 2930 } 2931 2932 static int 2933 do_download_sk(const char *skprovider, const char *device) 2934 { 2935 struct sshkey **keys; 2936 size_t nkeys, i; 2937 int r, ok = -1; 2938 char *fp, *pin = NULL, *pass = NULL, *path, *pubpath; 2939 const char *ext; 2940 2941 if (skprovider == NULL) 2942 fatal("Cannot download keys without provider"); 2943 2944 for (i = 0; i < 2; i++) { 2945 if (i == 1) { 2946 pin = read_passphrase("Enter PIN for authenticator: ", 2947 RP_ALLOW_STDIN); 2948 } 2949 if ((r = sshsk_load_resident(skprovider, device, pin, 2950 &keys, &nkeys)) != 0) { 2951 if (i == 0 && r == SSH_ERR_KEY_WRONG_PASSPHRASE) 2952 continue; 2953 if (pin != NULL) 2954 freezero(pin, strlen(pin)); 2955 error("Unable to load resident keys: %s", ssh_err(r)); 2956 return -1; 2957 } 2958 } 2959 if (nkeys == 0) 2960 logit("No keys to download"); 2961 if (pin != NULL) 2962 freezero(pin, strlen(pin)); 2963 2964 for (i = 0; i < nkeys; i++) { 2965 if (keys[i]->type != KEY_ECDSA_SK && 2966 keys[i]->type != KEY_ED25519_SK) { 2967 error("Unsupported key type %s (%d)", 2968 sshkey_type(keys[i]), keys[i]->type); 2969 continue; 2970 } 2971 if ((fp = sshkey_fingerprint(keys[i], 2972 fingerprint_hash, SSH_FP_DEFAULT)) == NULL) 2973 fatal("%s: sshkey_fingerprint failed", __func__); 2974 debug("%s: key %zu: %s %s %s (flags 0x%02x)", __func__, i, 2975 sshkey_type(keys[i]), fp, keys[i]->sk_application, 2976 keys[i]->sk_flags); 2977 ext = skip_ssh_url_preamble(keys[i]->sk_application); 2978 xasprintf(&path, "id_%s_rk%s%s", 2979 keys[i]->type == KEY_ECDSA_SK ? "ecdsa_sk" : "ed25519_sk", 2980 *ext == '\0' ? "" : "_", ext); 2981 2982 /* If the file already exists, ask the user to confirm. */ 2983 if (!confirm_overwrite(path)) { 2984 free(path); 2985 break; 2986 } 2987 2988 /* Save the key with the application string as the comment */ 2989 if (pass == NULL) 2990 pass = private_key_passphrase(); 2991 if ((r = sshkey_save_private(keys[i], path, pass, 2992 keys[i]->sk_application, private_key_format, 2993 openssh_format_cipher, rounds)) != 0) { 2994 error("Saving key \"%s\" failed: %s", 2995 path, ssh_err(r)); 2996 free(path); 2997 break; 2998 } 2999 if (!quiet) { 3000 printf("Saved %s key%s%s to %s\n", 3001 sshkey_type(keys[i]), 3002 *ext != '\0' ? " " : "", 3003 *ext != '\0' ? keys[i]->sk_application : "", 3004 path); 3005 } 3006 3007 /* Save public key too */ 3008 xasprintf(&pubpath, "%s.pub", path); 3009 free(path); 3010 if ((r = sshkey_save_public(keys[i], pubpath, 3011 keys[i]->sk_application)) != 0) { 3012 error("Saving public key \"%s\" failed: %s", 3013 pubpath, ssh_err(r)); 3014 free(pubpath); 3015 break; 3016 } 3017 free(pubpath); 3018 } 3019 3020 if (i >= nkeys) 3021 ok = 0; /* success */ 3022 if (pass != NULL) 3023 freezero(pass, strlen(pass)); 3024 for (i = 0; i < nkeys; i++) 3025 sshkey_free(keys[i]); 3026 free(keys); 3027 return ok ? 0 : -1; 3028 } 3029 3030 static void 3031 usage(void) 3032 { 3033 fprintf(stderr, 3034 "usage: ssh-keygen [-q] [-b bits] [-C comment] [-f output_keyfile] [-m format]\n" 3035 " [-t dsa | ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa]\n" 3036 " [-N new_passphrase] [-O option] [-w provider]\n" 3037 " ssh-keygen -p [-f keyfile] [-m format] [-N new_passphrase]\n" 3038 " [-P old_passphrase]\n" 3039 " ssh-keygen -i [-f input_keyfile] [-m key_format]\n" 3040 " ssh-keygen -e [-f input_keyfile] [-m key_format]\n" 3041 " ssh-keygen -y [-f input_keyfile]\n" 3042 " ssh-keygen -c [-C comment] [-f keyfile] [-P passphrase]\n" 3043 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n" 3044 " ssh-keygen -B [-f input_keyfile]\n"); 3045 #ifdef ENABLE_PKCS11 3046 fprintf(stderr, 3047 " ssh-keygen -D pkcs11\n"); 3048 #endif 3049 fprintf(stderr, 3050 " ssh-keygen -F hostname [-lv] [-f known_hosts_file]\n" 3051 " ssh-keygen -H [-f known_hosts_file]\n" 3052 " ssh-keygen -K [-w provider]\n" 3053 " ssh-keygen -R hostname [-f known_hosts_file]\n" 3054 " ssh-keygen -r hostname [-g] [-f input_keyfile]\n" 3055 #ifdef WITH_OPENSSL 3056 " ssh-keygen -M generate [-O option] output_file\n" 3057 " ssh-keygen -M screen [-f input_file] [-O option] output_file\n" 3058 #endif 3059 " ssh-keygen -I certificate_identity -s ca_key [-hU] [-D pkcs11_provider]\n" 3060 " [-n principals] [-O option] [-V validity_interval]\n" 3061 " [-z serial_number] file ...\n" 3062 " ssh-keygen -L [-f input_keyfile]\n" 3063 " ssh-keygen -A [-f prefix_path]\n" 3064 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n" 3065 " file ...\n" 3066 " ssh-keygen -Q [-l] -f krl_file [file ...]\n" 3067 " ssh-keygen -Y find-principals -s signature_file -f allowed_signers_file\n" 3068 " ssh-keygen -Y check-novalidate -n namespace -s signature_file\n" 3069 " ssh-keygen -Y sign -f key_file -n namespace file ...\n" 3070 " ssh-keygen -Y verify -f allowed_signers_file -I signer_identity\n" 3071 " -n namespace -s signature_file [-r revocation_file]\n"); 3072 exit(1); 3073 } 3074 3075 /* 3076 * Main program for key management. 3077 */ 3078 int 3079 main(int argc, char **argv) 3080 { 3081 char dotsshdir[PATH_MAX], comment[1024], *passphrase; 3082 char *rr_hostname = NULL, *ep, *fp, *ra; 3083 struct sshkey *private, *public; 3084 struct passwd *pw; 3085 struct stat st; 3086 int r, opt, type; 3087 int change_passphrase = 0, change_comment = 0, show_cert = 0; 3088 int find_host = 0, delete_host = 0, hash_hosts = 0; 3089 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 3090 int prefer_agent = 0, convert_to = 0, convert_from = 0; 3091 int print_public = 0, print_generic = 0, cert_serial_autoinc = 0; 3092 int do_gen_candidates = 0, do_screen_candidates = 0, download_sk = 0; 3093 unsigned long long cert_serial = 0; 3094 char *identity_comment = NULL, *ca_key_path = NULL, **opts = NULL; 3095 char *sk_application = NULL, *sk_device = NULL, *sk_user = NULL; 3096 char *sk_attestaion_path = NULL; 3097 struct sshbuf *challenge = NULL, *attest = NULL; 3098 size_t i, nopts = 0; 3099 u_int32_t bits = 0; 3100 uint8_t sk_flags = SSH_SK_USER_PRESENCE_REQD; 3101 const char *errstr; 3102 int log_level = SYSLOG_LEVEL_INFO; 3103 char *sign_op = NULL; 3104 3105 extern int optind; 3106 extern char *optarg; 3107 3108 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 3109 sanitise_stdfd(); 3110 3111 __progname = ssh_get_progname(argv[0]); 3112 3113 seed_rng(); 3114 3115 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 3116 3117 msetlocale(); 3118 3119 /* we need this for the home * directory. */ 3120 pw = getpwuid(getuid()); 3121 if (!pw) 3122 fatal("No user exists for uid %lu", (u_long)getuid()); 3123 if (gethostname(hostname, sizeof(hostname)) == -1) 3124 fatal("gethostname: %s", strerror(errno)); 3125 3126 sk_provider = getenv("SSH_SK_PROVIDER"); 3127 3128 /* Remaining characters: dGjJSTWx */ 3129 while ((opt = getopt(argc, argv, "ABHKLQUXceghiklopquvy" 3130 "C:D:E:F:I:M:N:O:P:R:V:Y:Z:" 3131 "a:b:f:g:m:n:r:s:t:w:z:")) != -1) { 3132 switch (opt) { 3133 case 'A': 3134 gen_all_hostkeys = 1; 3135 break; 3136 case 'b': 3137 bits = (u_int32_t)strtonum(optarg, 1, UINT32_MAX, 3138 &errstr); 3139 if (errstr) 3140 fatal("Bits has bad value %s (%s)", 3141 optarg, errstr); 3142 break; 3143 case 'E': 3144 fingerprint_hash = ssh_digest_alg_by_name(optarg); 3145 if (fingerprint_hash == -1) 3146 fatal("Invalid hash algorithm \"%s\"", optarg); 3147 break; 3148 case 'F': 3149 find_host = 1; 3150 rr_hostname = optarg; 3151 break; 3152 case 'H': 3153 hash_hosts = 1; 3154 break; 3155 case 'I': 3156 cert_key_id = optarg; 3157 break; 3158 case 'R': 3159 delete_host = 1; 3160 rr_hostname = optarg; 3161 break; 3162 case 'L': 3163 show_cert = 1; 3164 break; 3165 case 'l': 3166 print_fingerprint = 1; 3167 break; 3168 case 'B': 3169 print_bubblebabble = 1; 3170 break; 3171 case 'm': 3172 if (strcasecmp(optarg, "RFC4716") == 0 || 3173 strcasecmp(optarg, "ssh2") == 0) { 3174 convert_format = FMT_RFC4716; 3175 break; 3176 } 3177 if (strcasecmp(optarg, "PKCS8") == 0) { 3178 convert_format = FMT_PKCS8; 3179 private_key_format = SSHKEY_PRIVATE_PKCS8; 3180 break; 3181 } 3182 if (strcasecmp(optarg, "PEM") == 0) { 3183 convert_format = FMT_PEM; 3184 private_key_format = SSHKEY_PRIVATE_PEM; 3185 break; 3186 } 3187 fatal("Unsupported conversion format \"%s\"", optarg); 3188 case 'n': 3189 cert_principals = optarg; 3190 break; 3191 case 'o': 3192 /* no-op; new format is already the default */ 3193 break; 3194 case 'p': 3195 change_passphrase = 1; 3196 break; 3197 case 'c': 3198 change_comment = 1; 3199 break; 3200 case 'f': 3201 if (strlcpy(identity_file, optarg, 3202 sizeof(identity_file)) >= sizeof(identity_file)) 3203 fatal("Identity filename too long"); 3204 have_identity = 1; 3205 break; 3206 case 'g': 3207 print_generic = 1; 3208 break; 3209 case 'K': 3210 download_sk = 1; 3211 break; 3212 case 'P': 3213 identity_passphrase = optarg; 3214 break; 3215 case 'N': 3216 identity_new_passphrase = optarg; 3217 break; 3218 case 'Q': 3219 check_krl = 1; 3220 break; 3221 case 'O': 3222 opts = xrecallocarray(opts, nopts, nopts + 1, 3223 sizeof(*opts)); 3224 opts[nopts++] = xstrdup(optarg); 3225 break; 3226 case 'Z': 3227 openssh_format_cipher = optarg; 3228 break; 3229 case 'C': 3230 identity_comment = optarg; 3231 break; 3232 case 'q': 3233 quiet = 1; 3234 break; 3235 case 'e': 3236 /* export key */ 3237 convert_to = 1; 3238 break; 3239 case 'h': 3240 cert_key_type = SSH2_CERT_TYPE_HOST; 3241 certflags_flags = 0; 3242 break; 3243 case 'k': 3244 gen_krl = 1; 3245 break; 3246 case 'i': 3247 case 'X': 3248 /* import key */ 3249 convert_from = 1; 3250 break; 3251 case 'y': 3252 print_public = 1; 3253 break; 3254 case 's': 3255 ca_key_path = optarg; 3256 break; 3257 case 't': 3258 key_type_name = optarg; 3259 break; 3260 case 'D': 3261 pkcs11provider = optarg; 3262 break; 3263 case 'U': 3264 prefer_agent = 1; 3265 break; 3266 case 'u': 3267 update_krl = 1; 3268 break; 3269 case 'v': 3270 if (log_level == SYSLOG_LEVEL_INFO) 3271 log_level = SYSLOG_LEVEL_DEBUG1; 3272 else { 3273 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 3274 log_level < SYSLOG_LEVEL_DEBUG3) 3275 log_level++; 3276 } 3277 break; 3278 case 'r': 3279 rr_hostname = optarg; 3280 break; 3281 case 'a': 3282 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr); 3283 if (errstr) 3284 fatal("Invalid number: %s (%s)", 3285 optarg, errstr); 3286 break; 3287 case 'V': 3288 parse_cert_times(optarg); 3289 break; 3290 case 'Y': 3291 sign_op = optarg; 3292 break; 3293 case 'w': 3294 sk_provider = optarg; 3295 break; 3296 case 'z': 3297 errno = 0; 3298 if (*optarg == '+') { 3299 cert_serial_autoinc = 1; 3300 optarg++; 3301 } 3302 cert_serial = strtoull(optarg, &ep, 10); 3303 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 3304 (errno == ERANGE && cert_serial == ULLONG_MAX)) 3305 fatal("Invalid serial number \"%s\"", optarg); 3306 break; 3307 case 'M': 3308 if (strcmp(optarg, "generate") == 0) 3309 do_gen_candidates = 1; 3310 else if (strcmp(optarg, "screen") == 0) 3311 do_screen_candidates = 1; 3312 else 3313 fatal("Unsupported moduli option %s", optarg); 3314 break; 3315 case '?': 3316 default: 3317 usage(); 3318 } 3319 } 3320 3321 #ifdef ENABLE_SK_INTERNAL 3322 if (sk_provider == NULL) 3323 sk_provider = "internal"; 3324 #endif 3325 3326 /* reinit */ 3327 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 3328 3329 argv += optind; 3330 argc -= optind; 3331 3332 if (sign_op != NULL) { 3333 if (strncmp(sign_op, "find-principals", 15) == 0) { 3334 if (ca_key_path == NULL) { 3335 error("Too few arguments for find-principals:" 3336 "missing signature file"); 3337 exit(1); 3338 } 3339 if (!have_identity) { 3340 error("Too few arguments for find-principals:" 3341 "missing allowed keys file"); 3342 exit(1); 3343 } 3344 return sig_find_principals(ca_key_path, identity_file); 3345 } else if (strncmp(sign_op, "sign", 4) == 0) { 3346 if (cert_principals == NULL || 3347 *cert_principals == '\0') { 3348 error("Too few arguments for sign: " 3349 "missing namespace"); 3350 exit(1); 3351 } 3352 if (!have_identity) { 3353 error("Too few arguments for sign: " 3354 "missing key"); 3355 exit(1); 3356 } 3357 return sig_sign(identity_file, cert_principals, 3358 argc, argv); 3359 } else if (strncmp(sign_op, "check-novalidate", 16) == 0) { 3360 if (ca_key_path == NULL) { 3361 error("Too few arguments for check-novalidate: " 3362 "missing signature file"); 3363 exit(1); 3364 } 3365 return sig_verify(ca_key_path, cert_principals, 3366 NULL, NULL, NULL); 3367 } else if (strncmp(sign_op, "verify", 6) == 0) { 3368 if (cert_principals == NULL || 3369 *cert_principals == '\0') { 3370 error("Too few arguments for verify: " 3371 "missing namespace"); 3372 exit(1); 3373 } 3374 if (ca_key_path == NULL) { 3375 error("Too few arguments for verify: " 3376 "missing signature file"); 3377 exit(1); 3378 } 3379 if (!have_identity) { 3380 error("Too few arguments for sign: " 3381 "missing allowed keys file"); 3382 exit(1); 3383 } 3384 if (cert_key_id == NULL) { 3385 error("Too few arguments for verify: " 3386 "missing principal ID"); 3387 exit(1); 3388 } 3389 return sig_verify(ca_key_path, cert_principals, 3390 cert_key_id, identity_file, rr_hostname); 3391 } 3392 error("Unsupported operation for -Y: \"%s\"", sign_op); 3393 usage(); 3394 /* NOTREACHED */ 3395 } 3396 3397 if (ca_key_path != NULL) { 3398 if (argc < 1 && !gen_krl) { 3399 error("Too few arguments."); 3400 usage(); 3401 } 3402 } else if (argc > 0 && !gen_krl && !check_krl && 3403 !do_gen_candidates && !do_screen_candidates) { 3404 error("Too many arguments."); 3405 usage(); 3406 } 3407 if (change_passphrase && change_comment) { 3408 error("Can only have one of -p and -c."); 3409 usage(); 3410 } 3411 if (print_fingerprint && (delete_host || hash_hosts)) { 3412 error("Cannot use -l with -H or -R."); 3413 usage(); 3414 } 3415 if (gen_krl) { 3416 do_gen_krl(pw, update_krl, ca_key_path, 3417 cert_serial, identity_comment, argc, argv); 3418 return (0); 3419 } 3420 if (check_krl) { 3421 do_check_krl(pw, print_fingerprint, argc, argv); 3422 return (0); 3423 } 3424 if (ca_key_path != NULL) { 3425 if (cert_key_id == NULL) 3426 fatal("Must specify key id (-I) when certifying"); 3427 for (i = 0; i < nopts; i++) 3428 add_cert_option(opts[i]); 3429 do_ca_sign(pw, ca_key_path, prefer_agent, 3430 cert_serial, cert_serial_autoinc, argc, argv); 3431 } 3432 if (show_cert) 3433 do_show_cert(pw); 3434 if (delete_host || hash_hosts || find_host) { 3435 do_known_hosts(pw, rr_hostname, find_host, 3436 delete_host, hash_hosts); 3437 } 3438 if (pkcs11provider != NULL) 3439 do_download(pw); 3440 if (download_sk) { 3441 for (i = 0; i < nopts; i++) { 3442 if (strncasecmp(opts[i], "device=", 7) == 0) { 3443 sk_device = xstrdup(opts[i] + 7); 3444 } else { 3445 fatal("Option \"%s\" is unsupported for " 3446 "FIDO authenticator download", opts[i]); 3447 } 3448 } 3449 return do_download_sk(sk_provider, sk_device); 3450 } 3451 if (print_fingerprint || print_bubblebabble) 3452 do_fingerprint(pw); 3453 if (change_passphrase) 3454 do_change_passphrase(pw); 3455 if (change_comment) 3456 do_change_comment(pw, identity_comment); 3457 #ifdef WITH_OPENSSL 3458 if (convert_to) 3459 do_convert_to(pw); 3460 if (convert_from) 3461 do_convert_from(pw); 3462 #else /* WITH_OPENSSL */ 3463 if (convert_to || convert_from) 3464 fatal("key conversion disabled at compile time"); 3465 #endif /* WITH_OPENSSL */ 3466 if (print_public) 3467 do_print_public(pw); 3468 if (rr_hostname != NULL) { 3469 unsigned int n = 0; 3470 3471 if (have_identity) { 3472 n = do_print_resource_record(pw, identity_file, 3473 rr_hostname, print_generic); 3474 if (n == 0) 3475 fatal("%s: %s", identity_file, strerror(errno)); 3476 exit(0); 3477 } else { 3478 3479 n += do_print_resource_record(pw, 3480 _PATH_HOST_RSA_KEY_FILE, rr_hostname, 3481 print_generic); 3482 n += do_print_resource_record(pw, 3483 _PATH_HOST_DSA_KEY_FILE, rr_hostname, 3484 print_generic); 3485 n += do_print_resource_record(pw, 3486 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname, 3487 print_generic); 3488 n += do_print_resource_record(pw, 3489 _PATH_HOST_ED25519_KEY_FILE, rr_hostname, 3490 print_generic); 3491 n += do_print_resource_record(pw, 3492 _PATH_HOST_XMSS_KEY_FILE, rr_hostname, 3493 print_generic); 3494 if (n == 0) 3495 fatal("no keys found."); 3496 exit(0); 3497 } 3498 } 3499 3500 if (do_gen_candidates || do_screen_candidates) { 3501 if (argc <= 0) 3502 fatal("No output file specified"); 3503 else if (argc > 1) 3504 fatal("Too many output files specified"); 3505 } 3506 if (do_gen_candidates) { 3507 do_moduli_gen(argv[0], opts, nopts); 3508 return 0; 3509 } 3510 if (do_screen_candidates) { 3511 do_moduli_screen(argv[0], opts, nopts); 3512 return 0; 3513 } 3514 3515 if (gen_all_hostkeys) { 3516 do_gen_all_hostkeys(pw); 3517 return (0); 3518 } 3519 3520 if (key_type_name == NULL) 3521 key_type_name = DEFAULT_KEY_TYPE_NAME; 3522 3523 type = sshkey_type_from_name(key_type_name); 3524 type_bits_valid(type, key_type_name, &bits); 3525 3526 if (!quiet) 3527 printf("Generating public/private %s key pair.\n", 3528 key_type_name); 3529 switch (type) { 3530 case KEY_ECDSA_SK: 3531 case KEY_ED25519_SK: 3532 for (i = 0; i < nopts; i++) { 3533 if (strcasecmp(opts[i], "no-touch-required") == 0) { 3534 sk_flags &= ~SSH_SK_USER_PRESENCE_REQD; 3535 } else if (strcasecmp(opts[i], "resident") == 0) { 3536 sk_flags |= SSH_SK_RESIDENT_KEY; 3537 } else if (strncasecmp(opts[i], "device=", 7) == 0) { 3538 sk_device = xstrdup(opts[i] + 7); 3539 } else if (strncasecmp(opts[i], "user=", 5) == 0) { 3540 sk_user = xstrdup(opts[i] + 5); 3541 } else if (strncasecmp(opts[i], "challenge=", 10) == 0) { 3542 if ((r = sshbuf_load_file(opts[i] + 10, 3543 &challenge)) != 0) { 3544 fatal("Unable to load FIDO enrollment " 3545 "challenge \"%s\": %s", 3546 opts[i] + 10, ssh_err(r)); 3547 } 3548 } else if (strncasecmp(opts[i], 3549 "write-attestation=", 18) == 0) { 3550 sk_attestaion_path = opts[i] + 18; 3551 } else if (strncasecmp(opts[i], 3552 "application=", 12) == 0) { 3553 sk_application = xstrdup(opts[i] + 12); 3554 if (strncmp(sk_application, "ssh:", 4) != 0) { 3555 fatal("FIDO application string must " 3556 "begin with \"ssh:\""); 3557 } 3558 } else { 3559 fatal("Option \"%s\" is unsupported for " 3560 "FIDO authenticator enrollment", opts[i]); 3561 } 3562 } 3563 if (!quiet) { 3564 printf("You may need to touch your authenticator " 3565 "to authorize key generation.\n"); 3566 } 3567 passphrase = NULL; 3568 if ((attest = sshbuf_new()) == NULL) 3569 fatal("sshbuf_new failed"); 3570 for (i = 0 ; ; i++) { 3571 fflush(stdout); 3572 r = sshsk_enroll(type, sk_provider, sk_device, 3573 sk_application == NULL ? "ssh:" : sk_application, 3574 sk_user, sk_flags, passphrase, challenge, 3575 &private, attest); 3576 if (r == 0) 3577 break; 3578 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 3579 fatal("Key enrollment failed: %s", ssh_err(r)); 3580 else if (i > 0) 3581 error("PIN incorrect"); 3582 if (passphrase != NULL) { 3583 freezero(passphrase, strlen(passphrase)); 3584 passphrase = NULL; 3585 } 3586 if (i >= 3) 3587 fatal("Too many incorrect PINs"); 3588 passphrase = read_passphrase("Enter PIN for " 3589 "authenticator: ", RP_ALLOW_STDIN); 3590 } 3591 if (passphrase != NULL) { 3592 freezero(passphrase, strlen(passphrase)); 3593 passphrase = NULL; 3594 } 3595 break; 3596 default: 3597 if ((r = sshkey_generate(type, bits, &private)) != 0) 3598 fatal("sshkey_generate failed"); 3599 break; 3600 } 3601 if ((r = sshkey_from_private(private, &public)) != 0) 3602 fatal("sshkey_from_private failed: %s\n", ssh_err(r)); 3603 3604 if (!have_identity) 3605 ask_filename(pw, "Enter file in which to save the key"); 3606 3607 /* Create ~/.ssh directory if it doesn't already exist. */ 3608 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 3609 pw->pw_dir, _PATH_SSH_USER_DIR); 3610 if (strstr(identity_file, dotsshdir) != NULL) { 3611 if (stat(dotsshdir, &st) == -1) { 3612 if (errno != ENOENT) { 3613 error("Could not stat %s: %s", dotsshdir, 3614 strerror(errno)); 3615 } else if (mkdir(dotsshdir, 0700) == -1) { 3616 error("Could not create directory '%s': %s", 3617 dotsshdir, strerror(errno)); 3618 } else if (!quiet) 3619 printf("Created directory '%s'.\n", dotsshdir); 3620 } 3621 } 3622 /* If the file already exists, ask the user to confirm. */ 3623 if (!confirm_overwrite(identity_file)) 3624 exit(1); 3625 3626 /* Determine the passphrase for the private key */ 3627 passphrase = private_key_passphrase(); 3628 if (identity_comment) { 3629 strlcpy(comment, identity_comment, sizeof(comment)); 3630 } else { 3631 /* Create default comment field for the passphrase. */ 3632 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 3633 } 3634 3635 /* Save the key with the given passphrase and comment. */ 3636 if ((r = sshkey_save_private(private, identity_file, passphrase, 3637 comment, private_key_format, openssh_format_cipher, rounds)) != 0) { 3638 error("Saving key \"%s\" failed: %s", 3639 identity_file, ssh_err(r)); 3640 freezero(passphrase, strlen(passphrase)); 3641 exit(1); 3642 } 3643 freezero(passphrase, strlen(passphrase)); 3644 sshkey_free(private); 3645 3646 if (!quiet) { 3647 printf("Your identification has been saved in %s\n", 3648 identity_file); 3649 } 3650 3651 strlcat(identity_file, ".pub", sizeof(identity_file)); 3652 if ((r = sshkey_save_public(public, identity_file, comment)) != 0) { 3653 fatal("Unable to save public key to %s: %s", 3654 identity_file, ssh_err(r)); 3655 } 3656 3657 if (!quiet) { 3658 fp = sshkey_fingerprint(public, fingerprint_hash, 3659 SSH_FP_DEFAULT); 3660 ra = sshkey_fingerprint(public, fingerprint_hash, 3661 SSH_FP_RANDOMART); 3662 if (fp == NULL || ra == NULL) 3663 fatal("sshkey_fingerprint failed"); 3664 printf("Your public key has been saved in %s\n", 3665 identity_file); 3666 printf("The key fingerprint is:\n"); 3667 printf("%s %s\n", fp, comment); 3668 printf("The key's randomart image is:\n"); 3669 printf("%s\n", ra); 3670 free(ra); 3671 free(fp); 3672 } 3673 3674 if (sk_attestaion_path != NULL) { 3675 if (attest == NULL || sshbuf_len(attest) == 0) { 3676 fatal("Enrollment did not return attestation " 3677 "certificate"); 3678 } 3679 if ((r = sshbuf_write_file(sk_attestaion_path, attest)) != 0) { 3680 fatal("Unable to write attestation certificate " 3681 "\"%s\": %s", sk_attestaion_path, ssh_err(r)); 3682 } 3683 if (!quiet) { 3684 printf("Your FIDO attestation certificate has been " 3685 "saved in %s\n", sk_attestaion_path); 3686 } 3687 } 3688 sshbuf_free(attest); 3689 sshkey_free(public); 3690 3691 exit(0); 3692 } 3693