1 /* $NetBSD: ssh-keygen.c,v 1.35 2020/02/27 00:24:40 christos Exp $ */ 2 /* $OpenBSD: ssh-keygen.c,v 1.398 2020/02/07 03:27:54 djm Exp $ */ 3 /* 4 * Author: Tatu Ylonen <ylo@cs.hut.fi> 5 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 6 * All rights reserved 7 * Identity and host key generation and maintenance. 8 * 9 * As far as I am concerned, the code I have written for this software 10 * can be used freely for any purpose. Any derived versions of this 11 * software must be clearly marked as such, and if the derived work is 12 * incompatible with the protocol description in the RFC file, it must be 13 * called by a name other than "ssh" or "Secure Shell". 14 */ 15 16 #include "includes.h" 17 __RCSID("$NetBSD: ssh-keygen.c,v 1.35 2020/02/27 00:24:40 christos Exp $"); 18 #include <sys/types.h> 19 #include <sys/socket.h> 20 #include <sys/stat.h> 21 22 #ifdef WITH_OPENSSL 23 #include <openssl/evp.h> 24 #include <openssl/pem.h> 25 #endif 26 27 #include <stdint.h> 28 #include <errno.h> 29 #include <fcntl.h> 30 #include <netdb.h> 31 #include <pwd.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <stdarg.h> 36 #include <unistd.h> 37 #include <limits.h> 38 #include <locale.h> 39 40 #include "xmalloc.h" 41 #include "sshkey.h" 42 #include "authfile.h" 43 #include "sshbuf.h" 44 #include "pathnames.h" 45 #include "log.h" 46 #include "misc.h" 47 #include "match.h" 48 #include "hostfile.h" 49 #include "dns.h" 50 #include "ssh.h" 51 #include "ssh2.h" 52 #include "ssherr.h" 53 #include "atomicio.h" 54 #include "krl.h" 55 #include "digest.h" 56 #include "utf8.h" 57 #include "authfd.h" 58 #include "sshsig.h" 59 #include "ssh-sk.h" 60 #include "sk-api.h" /* XXX for SSH_SK_USER_PRESENCE_REQD; remove */ 61 62 #ifdef ENABLE_PKCS11 63 #include "ssh-pkcs11.h" 64 #endif 65 66 #ifdef WITH_OPENSSL 67 # define DEFAULT_KEY_TYPE_NAME "rsa" 68 #else 69 # define DEFAULT_KEY_TYPE_NAME "ed25519" 70 #endif 71 72 /* 73 * Default number of bits in the RSA, DSA and ECDSA keys. These value can be 74 * overridden on the command line. 75 * 76 * These values, with the exception of DSA, provide security equivalent to at 77 * least 128 bits of security according to NIST Special Publication 800-57: 78 * Recommendation for Key Management Part 1 rev 4 section 5.6.1. 79 * For DSA it (and FIPS-186-4 section 4.2) specifies that the only size for 80 * which a 160bit hash is acceptable is 1kbit, and since ssh-dss specifies only 81 * SHA1 we limit the DSA key size 1k bits. 82 */ 83 #define DEFAULT_BITS 3072 84 #define DEFAULT_BITS_DSA 1024 85 #define DEFAULT_BITS_ECDSA 256 86 87 static int quiet = 0; 88 89 /* Flag indicating that we just want to see the key fingerprint */ 90 static int print_fingerprint = 0; 91 static int print_bubblebabble = 0; 92 93 /* Hash algorithm to use for fingerprints. */ 94 static int fingerprint_hash = SSH_FP_HASH_DEFAULT; 95 96 /* The identity file name, given on the command line or entered by the user. */ 97 static char identity_file[PATH_MAX]; 98 static int have_identity = 0; 99 100 /* This is set to the passphrase if given on the command line. */ 101 static char *identity_passphrase = NULL; 102 103 /* This is set to the new passphrase if given on the command line. */ 104 static char *identity_new_passphrase = NULL; 105 106 /* Key type when certifying */ 107 static u_int cert_key_type = SSH2_CERT_TYPE_USER; 108 109 /* "key ID" of signed key */ 110 static char *cert_key_id = NULL; 111 112 /* Comma-separated list of principal names for certifying keys */ 113 static char *cert_principals = NULL; 114 115 /* Validity period for certificates */ 116 static u_int64_t cert_valid_from = 0; 117 static u_int64_t cert_valid_to = ~0ULL; 118 119 /* Certificate options */ 120 #define CERTOPT_X_FWD (1) 121 #define CERTOPT_AGENT_FWD (1<<1) 122 #define CERTOPT_PORT_FWD (1<<2) 123 #define CERTOPT_PTY (1<<3) 124 #define CERTOPT_USER_RC (1<<4) 125 #define CERTOPT_NO_REQUIRE_USER_PRESENCE (1<<5) 126 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 127 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 128 static u_int32_t certflags_flags = CERTOPT_DEFAULT; 129 static char *certflags_command = NULL; 130 static char *certflags_src_addr = NULL; 131 132 /* Arbitrary extensions specified by user */ 133 struct cert_userext { 134 char *key; 135 char *val; 136 int crit; 137 }; 138 static struct cert_userext *cert_userext; 139 static size_t ncert_userext; 140 141 /* Conversion to/from various formats */ 142 enum { 143 FMT_RFC4716, 144 FMT_PKCS8, 145 FMT_PEM 146 } convert_format = FMT_RFC4716; 147 148 static const char *key_type_name = NULL; 149 150 /* Load key from this PKCS#11 provider */ 151 static char *pkcs11provider = NULL; 152 153 /* FIDO/U2F provider to use */ 154 static const char *sk_provider = NULL; 155 156 /* Format for writing private keys */ 157 static int private_key_format = SSHKEY_PRIVATE_OPENSSH; 158 159 /* Cipher for new-format private keys */ 160 static char *openssh_format_cipher = NULL; 161 162 /* Number of KDF rounds to derive new format keys. */ 163 static int rounds = 0; 164 165 /* argv0 */ 166 extern char *__progname; 167 168 static char hostname[NI_MAXHOST]; 169 170 #ifdef WITH_OPENSSL 171 /* moduli.c */ 172 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 173 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 174 unsigned long); 175 #endif 176 177 static void 178 type_bits_valid(int type, const char *name, u_int32_t *bitsp) 179 { 180 if (type == KEY_UNSPEC) 181 fatal("unknown key type %s", key_type_name); 182 if (*bitsp == 0) { 183 #ifdef WITH_OPENSSL 184 u_int nid; 185 186 switch(type) { 187 case KEY_DSA: 188 *bitsp = DEFAULT_BITS_DSA; 189 break; 190 case KEY_ECDSA: 191 if (name != NULL && 192 (nid = sshkey_ecdsa_nid_from_name(name)) > 0) 193 *bitsp = sshkey_curve_nid_to_bits(nid); 194 if (*bitsp == 0) 195 *bitsp = DEFAULT_BITS_ECDSA; 196 break; 197 case KEY_RSA: 198 *bitsp = DEFAULT_BITS; 199 break; 200 } 201 #endif 202 } 203 #ifdef WITH_OPENSSL 204 switch (type) { 205 case KEY_DSA: 206 if (*bitsp != 1024) 207 fatal("Invalid DSA key length: must be 1024 bits"); 208 break; 209 case KEY_RSA: 210 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE) 211 fatal("Invalid RSA key length: minimum is %d bits", 212 SSH_RSA_MINIMUM_MODULUS_SIZE); 213 else if (*bitsp > OPENSSL_RSA_MAX_MODULUS_BITS) 214 fatal("Invalid RSA key length: maximum is %d bits", 215 OPENSSL_RSA_MAX_MODULUS_BITS); 216 break; 217 case KEY_ECDSA: 218 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1) 219 fatal("Invalid ECDSA key length: valid lengths are " 220 "256, 384 or 521 bits"); 221 } 222 #endif 223 } 224 225 /* 226 * Checks whether a file exists and, if so, asks the user whether they wish 227 * to overwrite it. 228 * Returns nonzero if the file does not already exist or if the user agrees to 229 * overwrite, or zero otherwise. 230 */ 231 static int 232 confirm_overwrite(const char *filename) 233 { 234 char yesno[3]; 235 struct stat st; 236 237 if (stat(filename, &st) != 0) 238 return 1; 239 printf("%s already exists.\n", filename); 240 printf("Overwrite (y/n)? "); 241 fflush(stdout); 242 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 243 return 0; 244 if (yesno[0] != 'y' && yesno[0] != 'Y') 245 return 0; 246 return 1; 247 } 248 249 static void 250 ask_filename(struct passwd *pw, const char *prompt) 251 { 252 char buf[1024]; 253 const char *name = NULL; 254 255 if (key_type_name == NULL) 256 name = _PATH_SSH_CLIENT_ID_RSA; 257 else { 258 switch (sshkey_type_from_name(key_type_name)) { 259 case KEY_DSA_CERT: 260 case KEY_DSA: 261 name = _PATH_SSH_CLIENT_ID_DSA; 262 break; 263 case KEY_ECDSA_CERT: 264 case KEY_ECDSA: 265 name = _PATH_SSH_CLIENT_ID_ECDSA; 266 break; 267 case KEY_ECDSA_SK_CERT: 268 case KEY_ECDSA_SK: 269 name = _PATH_SSH_CLIENT_ID_ECDSA_SK; 270 break; 271 case KEY_RSA_CERT: 272 case KEY_RSA: 273 name = _PATH_SSH_CLIENT_ID_RSA; 274 break; 275 case KEY_ED25519: 276 case KEY_ED25519_CERT: 277 name = _PATH_SSH_CLIENT_ID_ED25519; 278 break; 279 case KEY_ED25519_SK: 280 case KEY_ED25519_SK_CERT: 281 name = _PATH_SSH_CLIENT_ID_ED25519_SK; 282 break; 283 case KEY_XMSS: 284 case KEY_XMSS_CERT: 285 name = _PATH_SSH_CLIENT_ID_XMSS; 286 break; 287 default: 288 fatal("bad key type"); 289 } 290 } 291 snprintf(identity_file, sizeof(identity_file), 292 "%s/%s", pw->pw_dir, name); 293 printf("%s (%s): ", prompt, identity_file); 294 fflush(stdout); 295 if (fgets(buf, sizeof(buf), stdin) == NULL) 296 exit(1); 297 buf[strcspn(buf, "\n")] = '\0'; 298 if (strcmp(buf, "") != 0) 299 strlcpy(identity_file, buf, sizeof(identity_file)); 300 have_identity = 1; 301 } 302 303 static struct sshkey * 304 load_identity(const char *filename, char **commentp) 305 { 306 char *pass; 307 struct sshkey *prv; 308 int r; 309 310 if (commentp != NULL) 311 *commentp = NULL; 312 if ((r = sshkey_load_private(filename, "", &prv, commentp)) == 0) 313 return prv; 314 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 315 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 316 if (identity_passphrase) 317 pass = xstrdup(identity_passphrase); 318 else 319 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN); 320 r = sshkey_load_private(filename, pass, &prv, commentp); 321 explicit_bzero(pass, strlen(pass)); 322 free(pass); 323 if (r != 0) 324 fatal("Load key \"%s\": %s", filename, ssh_err(r)); 325 return prv; 326 } 327 328 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 329 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 330 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 331 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 332 333 #ifdef WITH_OPENSSL 334 __dead static void 335 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k) 336 { 337 struct sshbuf *b; 338 char comment[61], *b64; 339 int r; 340 341 if ((b = sshbuf_new()) == NULL) 342 fatal("%s: sshbuf_new failed", __func__); 343 if ((r = sshkey_putb(k, b)) != 0) 344 fatal("key_to_blob failed: %s", ssh_err(r)); 345 if ((b64 = sshbuf_dtob64_string(b, 1)) == NULL) 346 fatal("%s: sshbuf_dtob64_string failed", __func__); 347 348 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 349 snprintf(comment, sizeof(comment), 350 "%u-bit %s, converted by %s@%s from OpenSSH", 351 sshkey_size(k), sshkey_type(k), 352 pw->pw_name, hostname); 353 354 sshkey_free(k); 355 sshbuf_free(b); 356 357 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 358 fprintf(stdout, "Comment: \"%s\"\n%s", comment, b64); 359 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 360 free(b64); 361 exit(0); 362 } 363 364 __dead static void 365 do_convert_to_pkcs8(struct sshkey *k) 366 { 367 switch (sshkey_type_plain(k->type)) { 368 case KEY_RSA: 369 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 370 fatal("PEM_write_RSA_PUBKEY failed"); 371 break; 372 case KEY_DSA: 373 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 374 fatal("PEM_write_DSA_PUBKEY failed"); 375 break; 376 case KEY_ECDSA: 377 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 378 fatal("PEM_write_EC_PUBKEY failed"); 379 break; 380 default: 381 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 382 } 383 exit(0); 384 } 385 386 __dead static void 387 do_convert_to_pem(struct sshkey *k) 388 { 389 switch (sshkey_type_plain(k->type)) { 390 case KEY_RSA: 391 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 392 fatal("PEM_write_RSAPublicKey failed"); 393 break; 394 case KEY_DSA: 395 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 396 fatal("PEM_write_DSA_PUBKEY failed"); 397 break; 398 case KEY_ECDSA: 399 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 400 fatal("PEM_write_EC_PUBKEY failed"); 401 break; 402 default: 403 fatal("%s: unsupported key type %s", __func__, sshkey_type(k)); 404 } 405 exit(0); 406 } 407 408 __dead static void 409 do_convert_to(struct passwd *pw) 410 { 411 struct sshkey *k; 412 struct stat st; 413 int r; 414 415 if (!have_identity) 416 ask_filename(pw, "Enter file in which the key is"); 417 if (stat(identity_file, &st) == -1) 418 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 419 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0) 420 k = load_identity(identity_file, NULL); 421 switch (convert_format) { 422 case FMT_RFC4716: 423 do_convert_to_ssh2(pw, k); 424 break; 425 case FMT_PKCS8: 426 do_convert_to_pkcs8(k); 427 break; 428 case FMT_PEM: 429 do_convert_to_pem(k); 430 break; 431 default: 432 fatal("%s: unknown key format %d", __func__, convert_format); 433 } 434 exit(0); 435 } 436 437 /* 438 * This is almost exactly the bignum1 encoding, but with 32 bit for length 439 * instead of 16. 440 */ 441 static void 442 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value) 443 { 444 u_int bytes, bignum_bits; 445 int r; 446 447 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0) 448 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 449 bytes = (bignum_bits + 7) / 8; 450 if (sshbuf_len(b) < bytes) 451 fatal("%s: input buffer too small: need %d have %zu", 452 __func__, bytes, sshbuf_len(b)); 453 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL) 454 fatal("%s: BN_bin2bn failed", __func__); 455 if ((r = sshbuf_consume(b, bytes)) != 0) 456 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 457 } 458 459 static struct sshkey * 460 do_convert_private_ssh2(struct sshbuf *b) 461 { 462 struct sshkey *key = NULL; 463 char *type, *cipher; 464 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345"; 465 int r, rlen, ktype; 466 u_int magic, i1, i2, i3, i4; 467 size_t slen; 468 u_long e; 469 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL; 470 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL; 471 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL; 472 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL; 473 474 if ((r = sshbuf_get_u32(b, &magic)) != 0) 475 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 476 477 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 478 error("bad magic 0x%x != 0x%x", magic, 479 SSH_COM_PRIVATE_KEY_MAGIC); 480 return NULL; 481 } 482 if ((r = sshbuf_get_u32(b, &i1)) != 0 || 483 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 484 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 || 485 (r = sshbuf_get_u32(b, &i2)) != 0 || 486 (r = sshbuf_get_u32(b, &i3)) != 0 || 487 (r = sshbuf_get_u32(b, &i4)) != 0) 488 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 489 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 490 if (strcmp(cipher, "none") != 0) { 491 error("unsupported cipher %s", cipher); 492 free(cipher); 493 free(type); 494 return NULL; 495 } 496 free(cipher); 497 498 if (strstr(type, "dsa")) { 499 ktype = KEY_DSA; 500 } else if (strstr(type, "rsa")) { 501 ktype = KEY_RSA; 502 } else { 503 free(type); 504 return NULL; 505 } 506 if ((key = sshkey_new(ktype)) == NULL) 507 fatal("sshkey_new failed"); 508 free(type); 509 510 switch (key->type) { 511 case KEY_DSA: 512 if ((dsa_p = BN_new()) == NULL || 513 (dsa_q = BN_new()) == NULL || 514 (dsa_g = BN_new()) == NULL || 515 (dsa_pub_key = BN_new()) == NULL || 516 (dsa_priv_key = BN_new()) == NULL) 517 fatal("%s: BN_new", __func__); 518 buffer_get_bignum_bits(b, dsa_p); 519 buffer_get_bignum_bits(b, dsa_g); 520 buffer_get_bignum_bits(b, dsa_q); 521 buffer_get_bignum_bits(b, dsa_pub_key); 522 buffer_get_bignum_bits(b, dsa_priv_key); 523 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) 524 fatal("%s: DSA_set0_pqg failed", __func__); 525 dsa_p = dsa_q = dsa_g = NULL; /* transferred */ 526 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key)) 527 fatal("%s: DSA_set0_key failed", __func__); 528 dsa_pub_key = dsa_priv_key = NULL; /* transferred */ 529 break; 530 case KEY_RSA: 531 if ((r = sshbuf_get_u8(b, &e1)) != 0 || 532 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) || 533 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0)) 534 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 535 e = e1; 536 debug("e %lx", e); 537 if (e < 30) { 538 e <<= 8; 539 e += e2; 540 debug("e %lx", e); 541 e <<= 8; 542 e += e3; 543 debug("e %lx", e); 544 } 545 if ((rsa_e = BN_new()) == NULL) 546 fatal("%s: BN_new", __func__); 547 if (!BN_set_word(rsa_e, e)) { 548 BN_clear_free(rsa_e); 549 sshkey_free(key); 550 return NULL; 551 } 552 if ((rsa_n = BN_new()) == NULL || 553 (rsa_d = BN_new()) == NULL || 554 (rsa_p = BN_new()) == NULL || 555 (rsa_q = BN_new()) == NULL || 556 (rsa_iqmp = BN_new()) == NULL) 557 fatal("%s: BN_new", __func__); 558 buffer_get_bignum_bits(b, rsa_d); 559 buffer_get_bignum_bits(b, rsa_n); 560 buffer_get_bignum_bits(b, rsa_iqmp); 561 buffer_get_bignum_bits(b, rsa_q); 562 buffer_get_bignum_bits(b, rsa_p); 563 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d)) 564 fatal("%s: RSA_set0_key failed", __func__); 565 rsa_n = rsa_e = rsa_d = NULL; /* transferred */ 566 if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q)) 567 fatal("%s: RSA_set0_factors failed", __func__); 568 rsa_p = rsa_q = NULL; /* transferred */ 569 if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0) 570 fatal("generate RSA parameters failed: %s", ssh_err(r)); 571 BN_clear_free(rsa_iqmp); 572 break; 573 } 574 rlen = sshbuf_len(b); 575 if (rlen != 0) 576 error("%s: remaining bytes in key blob %d", __func__, rlen); 577 578 /* try the key */ 579 if (sshkey_sign(key, &sig, &slen, data, sizeof(data), 580 NULL, NULL, 0) != 0 || 581 sshkey_verify(key, sig, slen, data, sizeof(data), 582 NULL, 0, NULL) != 0) { 583 sshkey_free(key); 584 free(sig); 585 return NULL; 586 } 587 free(sig); 588 return key; 589 } 590 591 static int 592 get_line(FILE *fp, char *line, size_t len) 593 { 594 int c; 595 size_t pos = 0; 596 597 line[0] = '\0'; 598 while ((c = fgetc(fp)) != EOF) { 599 if (pos >= len - 1) 600 fatal("input line too long."); 601 switch (c) { 602 case '\r': 603 c = fgetc(fp); 604 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) 605 fatal("unget: %s", strerror(errno)); 606 return pos; 607 case '\n': 608 return pos; 609 } 610 line[pos++] = c; 611 line[pos] = '\0'; 612 } 613 /* We reached EOF */ 614 return -1; 615 } 616 617 static void 618 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private) 619 { 620 int r, blen, escaped = 0; 621 u_int len; 622 char line[1024]; 623 struct sshbuf *buf; 624 char encoded[8096]; 625 FILE *fp; 626 627 if ((buf = sshbuf_new()) == NULL) 628 fatal("sshbuf_new failed"); 629 if ((fp = fopen(identity_file, "r")) == NULL) 630 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 631 encoded[0] = '\0'; 632 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 633 if (blen > 0 && line[blen - 1] == '\\') 634 escaped++; 635 if (strncmp(line, "----", 4) == 0 || 636 strstr(line, ": ") != NULL) { 637 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 638 *private = 1; 639 if (strstr(line, " END ") != NULL) { 640 break; 641 } 642 /* fprintf(stderr, "ignore: %s", line); */ 643 continue; 644 } 645 if (escaped) { 646 escaped--; 647 /* fprintf(stderr, "escaped: %s", line); */ 648 continue; 649 } 650 strlcat(encoded, line, sizeof(encoded)); 651 } 652 len = strlen(encoded); 653 if (((len % 4) == 3) && 654 (encoded[len-1] == '=') && 655 (encoded[len-2] == '=') && 656 (encoded[len-3] == '=')) 657 encoded[len-3] = '\0'; 658 if ((r = sshbuf_b64tod(buf, encoded)) != 0) 659 fatal("%s: base64 decoding failed: %s", __func__, ssh_err(r)); 660 if (*private) 661 *k = do_convert_private_ssh2(buf); 662 else if ((r = sshkey_fromb(buf, k)) != 0) 663 fatal("decode blob failed: %s", ssh_err(r)); 664 sshbuf_free(buf); 665 fclose(fp); 666 } 667 668 static void 669 do_convert_from_pkcs8(struct sshkey **k, int *private) 670 { 671 EVP_PKEY *pubkey; 672 FILE *fp; 673 674 if ((fp = fopen(identity_file, "r")) == NULL) 675 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 676 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 677 fatal("%s: %s is not a recognised public key format", __func__, 678 identity_file); 679 } 680 fclose(fp); 681 switch (EVP_PKEY_base_id(pubkey)) { 682 case EVP_PKEY_RSA: 683 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 684 fatal("sshkey_new failed"); 685 (*k)->type = KEY_RSA; 686 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 687 break; 688 case EVP_PKEY_DSA: 689 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 690 fatal("sshkey_new failed"); 691 (*k)->type = KEY_DSA; 692 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 693 break; 694 case EVP_PKEY_EC: 695 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 696 fatal("sshkey_new failed"); 697 (*k)->type = KEY_ECDSA; 698 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 699 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa); 700 break; 701 default: 702 fatal("%s: unsupported pubkey type %d", __func__, 703 EVP_PKEY_base_id(pubkey)); 704 } 705 EVP_PKEY_free(pubkey); 706 return; 707 } 708 709 static void 710 do_convert_from_pem(struct sshkey **k, int *private) 711 { 712 FILE *fp; 713 RSA *rsa; 714 715 if ((fp = fopen(identity_file, "r")) == NULL) 716 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 717 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 718 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 719 fatal("sshkey_new failed"); 720 (*k)->type = KEY_RSA; 721 (*k)->rsa = rsa; 722 fclose(fp); 723 return; 724 } 725 fatal("%s: unrecognised raw private key format", __func__); 726 } 727 728 __dead static void 729 do_convert_from(struct passwd *pw) 730 { 731 struct sshkey *k = NULL; 732 int r, private = 0, ok = 0; 733 struct stat st; 734 735 if (!have_identity) 736 ask_filename(pw, "Enter file in which the key is"); 737 if (stat(identity_file, &st) == -1) 738 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 739 740 switch (convert_format) { 741 case FMT_RFC4716: 742 do_convert_from_ssh2(pw, &k, &private); 743 break; 744 case FMT_PKCS8: 745 do_convert_from_pkcs8(&k, &private); 746 break; 747 case FMT_PEM: 748 do_convert_from_pem(&k, &private); 749 break; 750 default: 751 fatal("%s: unknown key format %d", __func__, convert_format); 752 } 753 754 if (!private) { 755 if ((r = sshkey_write(k, stdout)) == 0) 756 ok = 1; 757 if (ok) 758 fprintf(stdout, "\n"); 759 } else { 760 switch (k->type) { 761 case KEY_DSA: 762 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 763 NULL, 0, NULL, NULL); 764 break; 765 case KEY_ECDSA: 766 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 767 NULL, 0, NULL, NULL); 768 break; 769 case KEY_RSA: 770 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 771 NULL, 0, NULL, NULL); 772 break; 773 default: 774 fatal("%s: unsupported key type %s", __func__, 775 sshkey_type(k)); 776 } 777 } 778 779 if (!ok) 780 fatal("key write failed"); 781 sshkey_free(k); 782 exit(0); 783 } 784 #endif 785 786 __dead static void 787 do_print_public(struct passwd *pw) 788 { 789 struct sshkey *prv; 790 struct stat st; 791 int r; 792 char *comment = NULL; 793 794 if (!have_identity) 795 ask_filename(pw, "Enter file in which the key is"); 796 if (stat(identity_file, &st) == -1) 797 fatal("%s: %s", identity_file, strerror(errno)); 798 prv = load_identity(identity_file, &comment); 799 if ((r = sshkey_write(prv, stdout)) != 0) 800 error("sshkey_write failed: %s", ssh_err(r)); 801 sshkey_free(prv); 802 if (comment != NULL && *comment != '\0') 803 fprintf(stdout, " %s", comment); 804 fprintf(stdout, "\n"); 805 free(comment); 806 exit(0); 807 } 808 809 __dead static void 810 do_download(struct passwd *pw) 811 { 812 #ifdef ENABLE_PKCS11 813 struct sshkey **keys = NULL; 814 int i, nkeys; 815 enum sshkey_fp_rep rep; 816 int fptype; 817 char *fp, *ra, **comments = NULL; 818 819 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 820 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 821 822 pkcs11_init(1); 823 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys, &comments); 824 if (nkeys <= 0) 825 fatal("cannot read public key from pkcs11"); 826 for (i = 0; i < nkeys; i++) { 827 if (print_fingerprint) { 828 fp = sshkey_fingerprint(keys[i], fptype, rep); 829 ra = sshkey_fingerprint(keys[i], fingerprint_hash, 830 SSH_FP_RANDOMART); 831 if (fp == NULL || ra == NULL) 832 fatal("%s: sshkey_fingerprint fail", __func__); 833 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]), 834 fp, sshkey_type(keys[i])); 835 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 836 printf("%s\n", ra); 837 free(ra); 838 free(fp); 839 } else { 840 (void) sshkey_write(keys[i], stdout); /* XXX check */ 841 fprintf(stdout, "%s%s\n", 842 *(comments[i]) == '\0' ? "" : " ", comments[i]); 843 } 844 free(comments[i]); 845 sshkey_free(keys[i]); 846 } 847 free(comments); 848 free(keys); 849 pkcs11_terminate(); 850 exit(0); 851 #else 852 fatal("no pkcs11 support"); 853 #endif /* ENABLE_PKCS11 */ 854 } 855 856 static struct sshkey * 857 try_read_key(char **cpp) 858 { 859 struct sshkey *ret; 860 int r; 861 862 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL) 863 fatal("sshkey_new failed"); 864 if ((r = sshkey_read(ret, cpp)) == 0) 865 return ret; 866 /* Not a key */ 867 sshkey_free(ret); 868 return NULL; 869 } 870 871 static void 872 fingerprint_one_key(const struct sshkey *public, const char *comment) 873 { 874 char *fp = NULL, *ra = NULL; 875 enum sshkey_fp_rep rep; 876 int fptype; 877 878 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 879 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 880 fp = sshkey_fingerprint(public, fptype, rep); 881 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART); 882 if (fp == NULL || ra == NULL) 883 fatal("%s: sshkey_fingerprint failed", __func__); 884 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp, 885 comment ? comment : "no comment", sshkey_type(public)); 886 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 887 printf("%s\n", ra); 888 free(ra); 889 free(fp); 890 } 891 892 static void 893 fingerprint_private(const char *path) 894 { 895 struct stat st; 896 char *comment = NULL; 897 struct sshkey *public = NULL; 898 int r; 899 900 if (stat(identity_file, &st) == -1) 901 fatal("%s: %s", path, strerror(errno)); 902 if ((r = sshkey_load_public(path, &public, &comment)) != 0) { 903 debug("load public \"%s\": %s", path, ssh_err(r)); 904 if ((r = sshkey_load_private(path, NULL, 905 &public, &comment)) != 0) { 906 debug("load private \"%s\": %s", path, ssh_err(r)); 907 fatal("%s is not a key file.", path); 908 } 909 } 910 911 fingerprint_one_key(public, comment); 912 sshkey_free(public); 913 free(comment); 914 } 915 916 __dead static void 917 do_fingerprint(struct passwd *pw) 918 { 919 FILE *f; 920 struct sshkey *public = NULL; 921 char *comment = NULL, *cp, *ep, *line = NULL; 922 size_t linesize = 0; 923 int i, invalid = 1; 924 const char *path; 925 u_long lnum = 0; 926 927 if (!have_identity) 928 ask_filename(pw, "Enter file in which the key is"); 929 path = identity_file; 930 931 if (strcmp(identity_file, "-") == 0) { 932 f = stdin; 933 path = "(stdin)"; 934 } else if ((f = fopen(path, "r")) == NULL) 935 fatal("%s: %s: %s", __progname, path, strerror(errno)); 936 937 while (getline(&line, &linesize, f) != -1) { 938 lnum++; 939 cp = line; 940 cp[strcspn(cp, "\n")] = '\0'; 941 /* Trim leading space and comments */ 942 cp = line + strspn(line, " \t"); 943 if (*cp == '#' || *cp == '\0') 944 continue; 945 946 /* 947 * Input may be plain keys, private keys, authorized_keys 948 * or known_hosts. 949 */ 950 951 /* 952 * Try private keys first. Assume a key is private if 953 * "SSH PRIVATE KEY" appears on the first line and we're 954 * not reading from stdin (XXX support private keys on stdin). 955 */ 956 if (lnum == 1 && strcmp(identity_file, "-") != 0 && 957 strstr(cp, "PRIVATE KEY") != NULL) { 958 free(line); 959 fclose(f); 960 fingerprint_private(path); 961 exit(0); 962 } 963 964 /* 965 * If it's not a private key, then this must be prepared to 966 * accept a public key prefixed with a hostname or options. 967 * Try a bare key first, otherwise skip the leading stuff. 968 */ 969 if ((public = try_read_key(&cp)) == NULL) { 970 i = strtol(cp, &ep, 10); 971 if (i == 0 || ep == NULL || 972 (*ep != ' ' && *ep != '\t')) { 973 int quoted = 0; 974 975 comment = cp; 976 for (; *cp && (quoted || (*cp != ' ' && 977 *cp != '\t')); cp++) { 978 if (*cp == '\\' && cp[1] == '"') 979 cp++; /* Skip both */ 980 else if (*cp == '"') 981 quoted = !quoted; 982 } 983 if (!*cp) 984 continue; 985 *cp++ = '\0'; 986 } 987 } 988 /* Retry after parsing leading hostname/key options */ 989 if (public == NULL && (public = try_read_key(&cp)) == NULL) { 990 debug("%s:%lu: not a public key", path, lnum); 991 continue; 992 } 993 994 /* Find trailing comment, if any */ 995 for (; *cp == ' ' || *cp == '\t'; cp++) 996 ; 997 if (*cp != '\0' && *cp != '#') 998 comment = cp; 999 1000 fingerprint_one_key(public, comment); 1001 sshkey_free(public); 1002 invalid = 0; /* One good key in the file is sufficient */ 1003 } 1004 fclose(f); 1005 free(line); 1006 1007 if (invalid) 1008 fatal("%s is not a public key file.", path); 1009 exit(0); 1010 } 1011 1012 static void 1013 do_gen_all_hostkeys(struct passwd *pw) 1014 { 1015 struct { 1016 const char *key_type; 1017 const char *key_type_display; 1018 const char *path; 1019 } key_types[] = { 1020 #ifdef WITH_OPENSSL 1021 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 1022 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 1023 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 1024 #endif /* WITH_OPENSSL */ 1025 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE }, 1026 #ifdef WITH_XMSS 1027 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE }, 1028 #endif /* WITH_XMSS */ 1029 { NULL, NULL, NULL } 1030 }; 1031 1032 u_int32_t bits = 0; 1033 int first = 0; 1034 struct stat st; 1035 struct sshkey *private, *public; 1036 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file; 1037 int i, type, fd, r; 1038 FILE *f; 1039 1040 for (i = 0; key_types[i].key_type; i++) { 1041 public = private = NULL; 1042 prv_tmp = pub_tmp = prv_file = pub_file = NULL; 1043 1044 xasprintf(&prv_file, "%s%s", 1045 identity_file, key_types[i].path); 1046 1047 /* Check whether private key exists and is not zero-length */ 1048 if (stat(prv_file, &st) == 0) { 1049 if (st.st_size != 0) 1050 goto next; 1051 } else if (errno != ENOENT) { 1052 error("Could not stat %s: %s", key_types[i].path, 1053 strerror(errno)); 1054 goto failnext; 1055 } 1056 1057 /* 1058 * Private key doesn't exist or is invalid; proceed with 1059 * key generation. 1060 */ 1061 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX", 1062 identity_file, key_types[i].path); 1063 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX", 1064 identity_file, key_types[i].path); 1065 xasprintf(&pub_file, "%s%s.pub", 1066 identity_file, key_types[i].path); 1067 1068 if (first == 0) { 1069 first = 1; 1070 printf("%s: generating new host keys: ", __progname); 1071 } 1072 printf("%s ", key_types[i].key_type_display); 1073 fflush(stdout); 1074 type = sshkey_type_from_name(key_types[i].key_type); 1075 if ((fd = mkstemp(prv_tmp)) == -1) { 1076 error("Could not save your public key in %s: %s", 1077 prv_tmp, strerror(errno)); 1078 goto failnext; 1079 } 1080 close(fd); /* just using mkstemp() to generate/reserve a name */ 1081 bits = 0; 1082 type_bits_valid(type, NULL, &bits); 1083 if ((r = sshkey_generate(type, bits, &private)) != 0) { 1084 error("sshkey_generate failed: %s", ssh_err(r)); 1085 goto failnext; 1086 } 1087 if ((r = sshkey_from_private(private, &public)) != 0) 1088 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1089 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 1090 hostname); 1091 if ((r = sshkey_save_private(private, prv_tmp, "", 1092 comment, private_key_format, openssh_format_cipher, 1093 rounds)) != 0) { 1094 error("Saving key \"%s\" failed: %s", 1095 prv_tmp, ssh_err(r)); 1096 goto failnext; 1097 } 1098 if ((fd = mkstemp(pub_tmp)) == -1) { 1099 error("Could not save your public key in %s: %s", 1100 pub_tmp, strerror(errno)); 1101 goto failnext; 1102 } 1103 (void)fchmod(fd, 0644); 1104 f = fdopen(fd, "w"); 1105 if (f == NULL) { 1106 error("fdopen %s failed: %s", pub_tmp, strerror(errno)); 1107 close(fd); 1108 goto failnext; 1109 } 1110 if ((r = sshkey_write(public, f)) != 0) { 1111 error("write key failed: %s", ssh_err(r)); 1112 fclose(f); 1113 goto failnext; 1114 } 1115 fprintf(f, " %s\n", comment); 1116 if (ferror(f) != 0) { 1117 error("write key failed: %s", strerror(errno)); 1118 fclose(f); 1119 goto failnext; 1120 } 1121 if (fclose(f) != 0) { 1122 error("key close failed: %s", strerror(errno)); 1123 goto failnext; 1124 } 1125 1126 /* Rename temporary files to their permanent locations. */ 1127 if (rename(pub_tmp, pub_file) != 0) { 1128 error("Unable to move %s into position: %s", 1129 pub_file, strerror(errno)); 1130 goto failnext; 1131 } 1132 if (rename(prv_tmp, prv_file) != 0) { 1133 error("Unable to move %s into position: %s", 1134 key_types[i].path, strerror(errno)); 1135 failnext: 1136 first = 0; 1137 goto next; 1138 } 1139 next: 1140 sshkey_free(private); 1141 sshkey_free(public); 1142 free(prv_tmp); 1143 free(pub_tmp); 1144 free(prv_file); 1145 free(pub_file); 1146 } 1147 if (first != 0) 1148 printf("\n"); 1149 } 1150 1151 struct known_hosts_ctx { 1152 const char *host; /* Hostname searched for in find/delete case */ 1153 FILE *out; /* Output file, stdout for find_hosts case */ 1154 int has_unhashed; /* When hashing, original had unhashed hosts */ 1155 int found_key; /* For find/delete, host was found */ 1156 int invalid; /* File contained invalid items; don't delete */ 1157 int hash_hosts; /* Hash hostnames as we go */ 1158 int find_host; /* Search for specific hostname */ 1159 int delete_host; /* Delete host from known_hosts */ 1160 }; 1161 1162 static int 1163 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx) 1164 { 1165 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1166 char *hashed, *cp, *hosts, *ohosts; 1167 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts); 1168 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM; 1169 1170 switch (l->status) { 1171 case HKF_STATUS_OK: 1172 case HKF_STATUS_MATCHED: 1173 /* 1174 * Don't hash hosts already already hashed, with wildcard 1175 * characters or a CA/revocation marker. 1176 */ 1177 if (was_hashed || has_wild || l->marker != MRK_NONE) { 1178 fprintf(ctx->out, "%s\n", l->line); 1179 if (has_wild && !ctx->find_host) { 1180 logit("%s:%lu: ignoring host name " 1181 "with wildcard: %.64s", l->path, 1182 l->linenum, l->hosts); 1183 } 1184 return 0; 1185 } 1186 /* 1187 * Split any comma-separated hostnames from the host list, 1188 * hash and store separately. 1189 */ 1190 ohosts = hosts = xstrdup(l->hosts); 1191 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') { 1192 lowercase(cp); 1193 if ((hashed = host_hash(cp, NULL, 0)) == NULL) 1194 fatal("hash_host failed"); 1195 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey); 1196 ctx->has_unhashed = 1; 1197 } 1198 free(ohosts); 1199 return 0; 1200 case HKF_STATUS_INVALID: 1201 /* Retain invalid lines, but mark file as invalid. */ 1202 ctx->invalid = 1; 1203 logit("%s:%lu: invalid line", l->path, l->linenum); 1204 /* FALLTHROUGH */ 1205 default: 1206 fprintf(ctx->out, "%s\n", l->line); 1207 return 0; 1208 } 1209 /* NOTREACHED */ 1210 return -1; 1211 } 1212 1213 static int 1214 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx) 1215 { 1216 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1217 enum sshkey_fp_rep rep; 1218 int fptype; 1219 char *fp = NULL, *ra = NULL; 1220 1221 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 1222 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 1223 1224 if (l->status == HKF_STATUS_MATCHED) { 1225 if (ctx->delete_host) { 1226 if (l->marker != MRK_NONE) { 1227 /* Don't remove CA and revocation lines */ 1228 fprintf(ctx->out, "%s\n", l->line); 1229 } else { 1230 /* 1231 * Hostname matches and has no CA/revoke 1232 * marker, delete it by *not* writing the 1233 * line to ctx->out. 1234 */ 1235 ctx->found_key = 1; 1236 if (!quiet) 1237 printf("# Host %s found: line %lu\n", 1238 ctx->host, l->linenum); 1239 } 1240 return 0; 1241 } else if (ctx->find_host) { 1242 ctx->found_key = 1; 1243 if (!quiet) { 1244 printf("# Host %s found: line %lu %s\n", 1245 ctx->host, 1246 l->linenum, l->marker == MRK_CA ? "CA" : 1247 (l->marker == MRK_REVOKE ? "REVOKED" : "")); 1248 } 1249 if (ctx->hash_hosts) 1250 known_hosts_hash(l, ctx); 1251 else if (print_fingerprint) { 1252 fp = sshkey_fingerprint(l->key, fptype, rep); 1253 ra = sshkey_fingerprint(l->key, 1254 fingerprint_hash, SSH_FP_RANDOMART); 1255 if (fp == NULL || ra == NULL) 1256 fatal("%s: sshkey_fingerprint failed", 1257 __func__); 1258 mprintf("%s %s %s%s%s\n", ctx->host, 1259 sshkey_type(l->key), fp, 1260 l->comment[0] ? " " : "", 1261 l->comment); 1262 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 1263 printf("%s\n", ra); 1264 free(ra); 1265 free(fp); 1266 } else 1267 fprintf(ctx->out, "%s\n", l->line); 1268 return 0; 1269 } 1270 } else if (ctx->delete_host) { 1271 /* Retain non-matching hosts when deleting */ 1272 if (l->status == HKF_STATUS_INVALID) { 1273 ctx->invalid = 1; 1274 logit("%s:%lu: invalid line", l->path, l->linenum); 1275 } 1276 fprintf(ctx->out, "%s\n", l->line); 1277 } 1278 return 0; 1279 } 1280 1281 __dead static void 1282 do_known_hosts(struct passwd *pw, const char *name, int find_host, 1283 int delete_host, int hash_hosts) 1284 { 1285 char *cp, tmp[PATH_MAX], old[PATH_MAX]; 1286 int r, fd, oerrno, inplace = 0; 1287 struct known_hosts_ctx ctx; 1288 u_int foreach_options; 1289 1290 if (!have_identity) { 1291 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1292 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1293 sizeof(identity_file)) 1294 fatal("Specified known hosts path too long"); 1295 free(cp); 1296 have_identity = 1; 1297 } 1298 1299 memset(&ctx, 0, sizeof(ctx)); 1300 ctx.out = stdout; 1301 ctx.host = name; 1302 ctx.hash_hosts = hash_hosts; 1303 ctx.find_host = find_host; 1304 ctx.delete_host = delete_host; 1305 1306 /* 1307 * Find hosts goes to stdout, hash and deletions happen in-place 1308 * A corner case is ssh-keygen -HF foo, which should go to stdout 1309 */ 1310 if (!find_host && (hash_hosts || delete_host)) { 1311 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1312 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1313 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1314 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1315 fatal("known_hosts path too long"); 1316 umask(077); 1317 if ((fd = mkstemp(tmp)) == -1) 1318 fatal("mkstemp: %s", strerror(errno)); 1319 if ((ctx.out = fdopen(fd, "w")) == NULL) { 1320 oerrno = errno; 1321 unlink(tmp); 1322 fatal("fdopen: %s", strerror(oerrno)); 1323 } 1324 inplace = 1; 1325 } 1326 /* XXX support identity_file == "-" for stdin */ 1327 foreach_options = find_host ? HKF_WANT_MATCH : 0; 1328 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0; 1329 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ? 1330 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL, 1331 foreach_options)) != 0) { 1332 if (inplace) 1333 unlink(tmp); 1334 fatal("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r)); 1335 } 1336 1337 if (inplace) 1338 fclose(ctx.out); 1339 1340 if (ctx.invalid) { 1341 error("%s is not a valid known_hosts file.", identity_file); 1342 if (inplace) { 1343 error("Not replacing existing known_hosts " 1344 "file because of errors"); 1345 unlink(tmp); 1346 } 1347 exit(1); 1348 } else if (delete_host && !ctx.found_key) { 1349 logit("Host %s not found in %s", name, identity_file); 1350 if (inplace) 1351 unlink(tmp); 1352 } else if (inplace) { 1353 /* Backup existing file */ 1354 if (unlink(old) == -1 && errno != ENOENT) 1355 fatal("unlink %.100s: %s", old, strerror(errno)); 1356 if (link(identity_file, old) == -1) 1357 fatal("link %.100s to %.100s: %s", identity_file, old, 1358 strerror(errno)); 1359 /* Move new one into place */ 1360 if (rename(tmp, identity_file) == -1) { 1361 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1362 strerror(errno)); 1363 unlink(tmp); 1364 unlink(old); 1365 exit(1); 1366 } 1367 1368 printf("%s updated.\n", identity_file); 1369 printf("Original contents retained as %s\n", old); 1370 if (ctx.has_unhashed) { 1371 logit("WARNING: %s contains unhashed entries", old); 1372 logit("Delete this file to ensure privacy " 1373 "of hostnames"); 1374 } 1375 } 1376 1377 exit (find_host && !ctx.found_key); 1378 } 1379 1380 /* 1381 * Perform changing a passphrase. The argument is the passwd structure 1382 * for the current user. 1383 */ 1384 __dead static void 1385 do_change_passphrase(struct passwd *pw) 1386 { 1387 char *comment; 1388 char *old_passphrase, *passphrase1, *passphrase2; 1389 struct stat st; 1390 struct sshkey *private; 1391 int r; 1392 1393 if (!have_identity) 1394 ask_filename(pw, "Enter file in which the key is"); 1395 if (stat(identity_file, &st) == -1) 1396 fatal("%s: %s", identity_file, strerror(errno)); 1397 /* Try to load the file with empty passphrase. */ 1398 r = sshkey_load_private(identity_file, "", &private, &comment); 1399 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) { 1400 if (identity_passphrase) 1401 old_passphrase = xstrdup(identity_passphrase); 1402 else 1403 old_passphrase = 1404 read_passphrase("Enter old passphrase: ", 1405 RP_ALLOW_STDIN); 1406 r = sshkey_load_private(identity_file, old_passphrase, 1407 &private, &comment); 1408 explicit_bzero(old_passphrase, strlen(old_passphrase)); 1409 free(old_passphrase); 1410 if (r != 0) 1411 goto badkey; 1412 } else if (r != 0) { 1413 badkey: 1414 fatal("Failed to load key %s: %s", identity_file, ssh_err(r)); 1415 } 1416 if (comment) 1417 mprintf("Key has comment '%s'\n", comment); 1418 1419 /* Ask the new passphrase (twice). */ 1420 if (identity_new_passphrase) { 1421 passphrase1 = xstrdup(identity_new_passphrase); 1422 passphrase2 = NULL; 1423 } else { 1424 passphrase1 = 1425 read_passphrase("Enter new passphrase (empty for no " 1426 "passphrase): ", RP_ALLOW_STDIN); 1427 passphrase2 = read_passphrase("Enter same passphrase again: ", 1428 RP_ALLOW_STDIN); 1429 1430 /* Verify that they are the same. */ 1431 if (strcmp(passphrase1, passphrase2) != 0) { 1432 explicit_bzero(passphrase1, strlen(passphrase1)); 1433 explicit_bzero(passphrase2, strlen(passphrase2)); 1434 free(passphrase1); 1435 free(passphrase2); 1436 printf("Pass phrases do not match. Try again.\n"); 1437 exit(1); 1438 } 1439 /* Destroy the other copy. */ 1440 explicit_bzero(passphrase2, strlen(passphrase2)); 1441 free(passphrase2); 1442 } 1443 1444 /* Save the file using the new passphrase. */ 1445 if ((r = sshkey_save_private(private, identity_file, passphrase1, 1446 comment, private_key_format, openssh_format_cipher, rounds)) != 0) { 1447 error("Saving key \"%s\" failed: %s.", 1448 identity_file, ssh_err(r)); 1449 explicit_bzero(passphrase1, strlen(passphrase1)); 1450 free(passphrase1); 1451 sshkey_free(private); 1452 free(comment); 1453 exit(1); 1454 } 1455 /* Destroy the passphrase and the copy of the key in memory. */ 1456 explicit_bzero(passphrase1, strlen(passphrase1)); 1457 free(passphrase1); 1458 sshkey_free(private); /* Destroys contents */ 1459 free(comment); 1460 1461 printf("Your identification has been saved with the new passphrase.\n"); 1462 exit(0); 1463 } 1464 1465 /* 1466 * Print the SSHFP RR. 1467 */ 1468 static int 1469 do_print_resource_record(struct passwd *pw, const char *fname, 1470 const char *hname, int print_generic) 1471 { 1472 struct sshkey *public; 1473 char *comment = NULL; 1474 struct stat st; 1475 int r; 1476 1477 if (fname == NULL) 1478 fatal("%s: no filename", __func__); 1479 if (stat(fname, &st) == -1) { 1480 if (errno == ENOENT) 1481 return 0; 1482 fatal("%s: %s", fname, strerror(errno)); 1483 } 1484 if ((r = sshkey_load_public(fname, &public, &comment)) != 0) 1485 fatal("Failed to read v2 public key from \"%s\": %s.", 1486 fname, ssh_err(r)); 1487 export_dns_rr(hname, public, stdout, print_generic); 1488 sshkey_free(public); 1489 free(comment); 1490 return 1; 1491 } 1492 1493 /* 1494 * Change the comment of a private key file. 1495 */ 1496 __dead static void 1497 do_change_comment(struct passwd *pw, const char *identity_comment) 1498 { 1499 char new_comment[1024], *comment, *passphrase; 1500 struct sshkey *private; 1501 struct sshkey *public; 1502 struct stat st; 1503 FILE *f; 1504 int r, fd; 1505 1506 if (!have_identity) 1507 ask_filename(pw, "Enter file in which the key is"); 1508 if (stat(identity_file, &st) == -1) 1509 fatal("%s: %s", identity_file, strerror(errno)); 1510 if ((r = sshkey_load_private(identity_file, "", 1511 &private, &comment)) == 0) 1512 passphrase = xstrdup(""); 1513 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 1514 fatal("Cannot load private key \"%s\": %s.", 1515 identity_file, ssh_err(r)); 1516 else { 1517 if (identity_passphrase) 1518 passphrase = xstrdup(identity_passphrase); 1519 else if (identity_new_passphrase) 1520 passphrase = xstrdup(identity_new_passphrase); 1521 else 1522 passphrase = read_passphrase("Enter passphrase: ", 1523 RP_ALLOW_STDIN); 1524 /* Try to load using the passphrase. */ 1525 if ((r = sshkey_load_private(identity_file, passphrase, 1526 &private, &comment)) != 0) { 1527 explicit_bzero(passphrase, strlen(passphrase)); 1528 free(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 explicit_bzero(passphrase, strlen(passphrase)); 1574 free(passphrase); 1575 sshkey_free(private); 1576 free(comment); 1577 exit(1); 1578 } 1579 explicit_bzero(passphrase, strlen(passphrase)); 1580 free(passphrase); 1581 if ((r = sshkey_from_private(private, &public)) != 0) 1582 fatal("sshkey_from_private failed: %s", ssh_err(r)); 1583 sshkey_free(private); 1584 1585 strlcat(identity_file, ".pub", sizeof(identity_file)); 1586 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1587 if (fd == -1) 1588 fatal("Could not save your public key in %s", identity_file); 1589 f = fdopen(fd, "w"); 1590 if (f == NULL) 1591 fatal("fdopen %s failed: %s", identity_file, strerror(errno)); 1592 if ((r = sshkey_write(public, f)) != 0) 1593 fatal("write key failed: %s", ssh_err(r)); 1594 sshkey_free(public); 1595 fprintf(f, " %s\n", new_comment); 1596 fclose(f); 1597 1598 free(comment); 1599 1600 if (strlen(new_comment) > 0) 1601 printf("Comment '%s' applied\n", new_comment); 1602 else 1603 printf("Comment removed\n"); 1604 1605 exit(0); 1606 } 1607 1608 static void 1609 add_flag_option(struct sshbuf *c, const char *name) 1610 { 1611 int r; 1612 1613 debug3("%s: %s", __func__, name); 1614 if ((r = sshbuf_put_cstring(c, name)) != 0 || 1615 (r = sshbuf_put_string(c, NULL, 0)) != 0) 1616 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1617 } 1618 1619 static void 1620 add_string_option(struct sshbuf *c, const char *name, const char *value) 1621 { 1622 struct sshbuf *b; 1623 int r; 1624 1625 debug3("%s: %s=%s", __func__, name, value); 1626 if ((b = sshbuf_new()) == NULL) 1627 fatal("%s: sshbuf_new failed", __func__); 1628 if ((r = sshbuf_put_cstring(b, value)) != 0 || 1629 (r = sshbuf_put_cstring(c, name)) != 0 || 1630 (r = sshbuf_put_stringb(c, b)) != 0) 1631 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1632 1633 sshbuf_free(b); 1634 } 1635 1636 #define OPTIONS_CRITICAL 1 1637 #define OPTIONS_EXTENSIONS 2 1638 static void 1639 prepare_options_buf(struct sshbuf *c, int which) 1640 { 1641 size_t i; 1642 1643 sshbuf_reset(c); 1644 if ((which & OPTIONS_CRITICAL) != 0 && 1645 certflags_command != NULL) 1646 add_string_option(c, "force-command", certflags_command); 1647 if ((which & OPTIONS_EXTENSIONS) != 0 && 1648 (certflags_flags & CERTOPT_X_FWD) != 0) 1649 add_flag_option(c, "permit-X11-forwarding"); 1650 if ((which & OPTIONS_EXTENSIONS) != 0 && 1651 (certflags_flags & CERTOPT_AGENT_FWD) != 0) 1652 add_flag_option(c, "permit-agent-forwarding"); 1653 if ((which & OPTIONS_EXTENSIONS) != 0 && 1654 (certflags_flags & CERTOPT_PORT_FWD) != 0) 1655 add_flag_option(c, "permit-port-forwarding"); 1656 if ((which & OPTIONS_EXTENSIONS) != 0 && 1657 (certflags_flags & CERTOPT_PTY) != 0) 1658 add_flag_option(c, "permit-pty"); 1659 if ((which & OPTIONS_EXTENSIONS) != 0 && 1660 (certflags_flags & CERTOPT_USER_RC) != 0) 1661 add_flag_option(c, "permit-user-rc"); 1662 if ((which & OPTIONS_CRITICAL) != 0 && 1663 (certflags_flags & CERTOPT_NO_REQUIRE_USER_PRESENCE) != 0) 1664 add_flag_option(c, "no-touch-required"); 1665 if ((which & OPTIONS_CRITICAL) != 0 && 1666 certflags_src_addr != NULL) 1667 add_string_option(c, "source-address", certflags_src_addr); 1668 for (i = 0; i < ncert_userext; i++) { 1669 if ((cert_userext[i].crit && (which & OPTIONS_EXTENSIONS)) || 1670 (!cert_userext[i].crit && (which & OPTIONS_CRITICAL))) 1671 continue; 1672 if (cert_userext[i].val == NULL) 1673 add_flag_option(c, cert_userext[i].key); 1674 else { 1675 add_string_option(c, cert_userext[i].key, 1676 cert_userext[i].val); 1677 } 1678 } 1679 } 1680 1681 static struct sshkey * 1682 load_pkcs11_key(char *path) 1683 { 1684 #ifdef ENABLE_PKCS11 1685 struct sshkey **keys = NULL, *public, *private = NULL; 1686 int r, i, nkeys; 1687 1688 if ((r = sshkey_load_public(path, &public, NULL)) != 0) 1689 fatal("Couldn't load CA public key \"%s\": %s", 1690 path, ssh_err(r)); 1691 1692 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, 1693 &keys, NULL); 1694 debug3("%s: %d keys", __func__, nkeys); 1695 if (nkeys <= 0) 1696 fatal("cannot read public key from pkcs11"); 1697 for (i = 0; i < nkeys; i++) { 1698 if (sshkey_equal_public(public, keys[i])) { 1699 private = keys[i]; 1700 continue; 1701 } 1702 sshkey_free(keys[i]); 1703 } 1704 free(keys); 1705 sshkey_free(public); 1706 return private; 1707 #else 1708 fatal("no pkcs11 support"); 1709 #endif /* ENABLE_PKCS11 */ 1710 } 1711 1712 /* Signer for sshkey_certify_custom that uses the agent */ 1713 static int 1714 agent_signer(struct sshkey *key, u_char **sigp, size_t *lenp, 1715 const u_char *data, size_t datalen, 1716 const char *alg, const char *provider, u_int compat, void *ctx) 1717 { 1718 int *agent_fdp = (int *)ctx; 1719 1720 return ssh_agent_sign(*agent_fdp, key, sigp, lenp, 1721 data, datalen, alg, compat); 1722 } 1723 1724 __dead static void 1725 do_ca_sign(struct passwd *pw, const char *ca_key_path, int prefer_agent, 1726 unsigned long long cert_serial, int cert_serial_autoinc, 1727 int argc, char **argv) 1728 { 1729 int r, i, fd, found, agent_fd = -1; 1730 u_int n; 1731 struct sshkey *ca, *public; 1732 char valid[64], *otmp, *tmp, *cp, *out, *comment; 1733 char *ca_fp = NULL, **plist = NULL; 1734 FILE *f; 1735 struct ssh_identitylist *agent_ids; 1736 size_t j; 1737 struct notifier_ctx *notifier = NULL; 1738 1739 #ifdef ENABLE_PKCS11 1740 pkcs11_init(1); 1741 #endif 1742 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1743 if (pkcs11provider != NULL) { 1744 /* If a PKCS#11 token was specified then try to use it */ 1745 if ((ca = load_pkcs11_key(tmp)) == NULL) 1746 fatal("No PKCS#11 key matching %s found", ca_key_path); 1747 } else if (prefer_agent) { 1748 /* 1749 * Agent signature requested. Try to use agent after making 1750 * sure the public key specified is actually present in the 1751 * agent. 1752 */ 1753 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 1754 fatal("Cannot load CA public key %s: %s", 1755 tmp, ssh_err(r)); 1756 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 1757 fatal("Cannot use public key for CA signature: %s", 1758 ssh_err(r)); 1759 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0) 1760 fatal("Retrieve agent key list: %s", ssh_err(r)); 1761 found = 0; 1762 for (j = 0; j < agent_ids->nkeys; j++) { 1763 if (sshkey_equal(ca, agent_ids->keys[j])) { 1764 found = 1; 1765 break; 1766 } 1767 } 1768 if (!found) 1769 fatal("CA key %s not found in agent", tmp); 1770 ssh_free_identitylist(agent_ids); 1771 ca->flags |= SSHKEY_FLAG_EXT; 1772 } else { 1773 /* CA key is assumed to be a private key on the filesystem */ 1774 ca = load_identity(tmp, NULL); 1775 } 1776 free(tmp); 1777 1778 if (key_type_name != NULL) { 1779 if (sshkey_type_from_name(key_type_name) != ca->type) { 1780 fatal("CA key type %s doesn't match specified %s", 1781 sshkey_ssh_name(ca), key_type_name); 1782 } 1783 } else if (ca->type == KEY_RSA) { 1784 /* Default to a good signature algorithm */ 1785 key_type_name = "rsa-sha2-512"; 1786 } 1787 ca_fp = sshkey_fingerprint(ca, fingerprint_hash, SSH_FP_DEFAULT); 1788 1789 for (i = 0; i < argc; i++) { 1790 /* Split list of principals */ 1791 n = 0; 1792 if (cert_principals != NULL) { 1793 otmp = tmp = xstrdup(cert_principals); 1794 plist = NULL; 1795 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1796 plist = xreallocarray(plist, n + 1, sizeof(*plist)); 1797 if (*(plist[n] = xstrdup(cp)) == '\0') 1798 fatal("Empty principal name"); 1799 } 1800 free(otmp); 1801 } 1802 if (n > SSHKEY_CERT_MAX_PRINCIPALS) 1803 fatal("Too many certificate principals specified"); 1804 1805 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1806 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0) 1807 fatal("%s: unable to open \"%s\": %s", 1808 __func__, tmp, ssh_err(r)); 1809 if (sshkey_is_cert(public)) 1810 fatal("%s: key \"%s\" type %s cannot be certified", 1811 __func__, tmp, sshkey_type(public)); 1812 1813 /* Prepare certificate to sign */ 1814 if ((r = sshkey_to_certified(public)) != 0) 1815 fatal("Could not upgrade key %s to certificate: %s", 1816 tmp, ssh_err(r)); 1817 public->cert->type = cert_key_type; 1818 public->cert->serial = (u_int64_t)cert_serial; 1819 public->cert->key_id = xstrdup(cert_key_id); 1820 public->cert->nprincipals = n; 1821 public->cert->principals = plist; 1822 public->cert->valid_after = cert_valid_from; 1823 public->cert->valid_before = cert_valid_to; 1824 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL); 1825 prepare_options_buf(public->cert->extensions, 1826 OPTIONS_EXTENSIONS); 1827 if ((r = sshkey_from_private(ca, 1828 &public->cert->signature_key)) != 0) 1829 fatal("sshkey_from_private (ca key): %s", ssh_err(r)); 1830 1831 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) { 1832 if ((r = sshkey_certify_custom(public, ca, 1833 key_type_name, sk_provider, agent_signer, 1834 &agent_fd)) != 0) 1835 fatal("Couldn't certify key %s via agent: %s", 1836 tmp, ssh_err(r)); 1837 } else { 1838 if (sshkey_is_sk(ca) && 1839 (ca->sk_flags & SSH_SK_USER_PRESENCE_REQD)) { 1840 notifier = notify_start(0, 1841 "Confirm user presence for key %s %s", 1842 sshkey_type(ca), ca_fp); 1843 } 1844 r = sshkey_certify(public, ca, key_type_name, 1845 sk_provider); 1846 notify_complete(notifier); 1847 if (r != 0) 1848 fatal("Couldn't certify key %s: %s", 1849 tmp, ssh_err(r)); 1850 } 1851 1852 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1853 *cp = '\0'; 1854 xasprintf(&out, "%s-cert.pub", tmp); 1855 free(tmp); 1856 1857 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) 1858 fatal("Could not open \"%s\" for writing: %s", out, 1859 strerror(errno)); 1860 if ((f = fdopen(fd, "w")) == NULL) 1861 fatal("%s: fdopen: %s", __func__, strerror(errno)); 1862 if ((r = sshkey_write(public, f)) != 0) 1863 fatal("Could not write certified key to %s: %s", 1864 out, ssh_err(r)); 1865 fprintf(f, " %s\n", comment); 1866 fclose(f); 1867 1868 if (!quiet) { 1869 sshkey_format_cert_validity(public->cert, 1870 valid, sizeof(valid)); 1871 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1872 "valid %s", sshkey_cert_type(public), 1873 out, public->cert->key_id, 1874 (unsigned long long)public->cert->serial, 1875 cert_principals != NULL ? " for " : "", 1876 cert_principals != NULL ? cert_principals : "", 1877 valid); 1878 } 1879 1880 sshkey_free(public); 1881 free(out); 1882 if (cert_serial_autoinc) 1883 cert_serial++; 1884 } 1885 free(ca_fp); 1886 #ifdef ENABLE_PKCS11 1887 pkcs11_terminate(); 1888 #endif 1889 exit(0); 1890 } 1891 1892 static u_int64_t 1893 parse_relative_time(const char *s, time_t now) 1894 { 1895 int64_t mul, secs; 1896 1897 mul = *s == '-' ? -1 : 1; 1898 1899 if ((secs = convtime(s + 1)) == -1) 1900 fatal("Invalid relative certificate time %s", s); 1901 if (mul == -1 && secs > now) 1902 fatal("Certificate time %s cannot be represented", s); 1903 return now + (u_int64_t)(secs * mul); 1904 } 1905 1906 static void 1907 parse_cert_times(char *timespec) 1908 { 1909 char *from, *to; 1910 time_t now = time(NULL); 1911 int64_t secs; 1912 1913 /* +timespec relative to now */ 1914 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1915 if ((secs = convtime(timespec + 1)) == -1) 1916 fatal("Invalid relative certificate life %s", timespec); 1917 cert_valid_to = now + secs; 1918 /* 1919 * Backdate certificate one minute to avoid problems on hosts 1920 * with poorly-synchronised clocks. 1921 */ 1922 cert_valid_from = ((now - 59)/ 60) * 60; 1923 return; 1924 } 1925 1926 /* 1927 * from:to, where 1928 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "always" 1929 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "forever" 1930 */ 1931 from = xstrdup(timespec); 1932 to = strchr(from, ':'); 1933 if (to == NULL || from == to || *(to + 1) == '\0') 1934 fatal("Invalid certificate life specification %s", timespec); 1935 *to++ = '\0'; 1936 1937 if (*from == '-' || *from == '+') 1938 cert_valid_from = parse_relative_time(from, now); 1939 else if (strcmp(from, "always") == 0) 1940 cert_valid_from = 0; 1941 else if (parse_absolute_time(from, &cert_valid_from) != 0) 1942 fatal("Invalid from time \"%s\"", from); 1943 1944 if (*to == '-' || *to == '+') 1945 cert_valid_to = parse_relative_time(to, now); 1946 else if (strcmp(to, "forever") == 0) 1947 cert_valid_to = ~(u_int64_t)0; 1948 else if (parse_absolute_time(to, &cert_valid_to) != 0) 1949 fatal("Invalid to time \"%s\"", to); 1950 1951 if (cert_valid_to <= cert_valid_from) 1952 fatal("Empty certificate validity interval"); 1953 free(from); 1954 } 1955 1956 static void 1957 add_cert_option(char *opt) 1958 { 1959 char *val, *cp; 1960 int iscrit = 0; 1961 1962 if (strcasecmp(opt, "clear") == 0) 1963 certflags_flags = 0; 1964 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1965 certflags_flags &= ~CERTOPT_X_FWD; 1966 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1967 certflags_flags |= CERTOPT_X_FWD; 1968 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1969 certflags_flags &= ~CERTOPT_AGENT_FWD; 1970 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1971 certflags_flags |= CERTOPT_AGENT_FWD; 1972 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1973 certflags_flags &= ~CERTOPT_PORT_FWD; 1974 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1975 certflags_flags |= CERTOPT_PORT_FWD; 1976 else if (strcasecmp(opt, "no-pty") == 0) 1977 certflags_flags &= ~CERTOPT_PTY; 1978 else if (strcasecmp(opt, "permit-pty") == 0) 1979 certflags_flags |= CERTOPT_PTY; 1980 else if (strcasecmp(opt, "no-user-rc") == 0) 1981 certflags_flags &= ~CERTOPT_USER_RC; 1982 else if (strcasecmp(opt, "permit-user-rc") == 0) 1983 certflags_flags |= CERTOPT_USER_RC; 1984 else if (strcasecmp(opt, "touch-required") == 0) 1985 certflags_flags &= ~CERTOPT_NO_REQUIRE_USER_PRESENCE; 1986 else if (strcasecmp(opt, "no-touch-required") == 0) 1987 certflags_flags |= CERTOPT_NO_REQUIRE_USER_PRESENCE; 1988 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1989 val = opt + 14; 1990 if (*val == '\0') 1991 fatal("Empty force-command option"); 1992 if (certflags_command != NULL) 1993 fatal("force-command already specified"); 1994 certflags_command = xstrdup(val); 1995 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1996 val = opt + 15; 1997 if (*val == '\0') 1998 fatal("Empty source-address option"); 1999 if (certflags_src_addr != NULL) 2000 fatal("source-address already specified"); 2001 if (addr_match_cidr_list(NULL, val) != 0) 2002 fatal("Invalid source-address list"); 2003 certflags_src_addr = xstrdup(val); 2004 } else if (strncasecmp(opt, "extension:", 10) == 0 || 2005 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) { 2006 val = xstrdup(strchr(opt, ':') + 1); 2007 if ((cp = strchr(val, '=')) != NULL) 2008 *cp++ = '\0'; 2009 cert_userext = xreallocarray(cert_userext, ncert_userext + 1, 2010 sizeof(*cert_userext)); 2011 cert_userext[ncert_userext].key = val; 2012 cert_userext[ncert_userext].val = cp == NULL ? 2013 NULL : xstrdup(cp); 2014 cert_userext[ncert_userext].crit = iscrit; 2015 ncert_userext++; 2016 } else 2017 fatal("Unsupported certificate option \"%s\"", opt); 2018 } 2019 2020 static void 2021 show_options(struct sshbuf *optbuf, int in_critical) 2022 { 2023 char *name, *arg; 2024 struct sshbuf *options, *option = NULL; 2025 int r; 2026 2027 if ((options = sshbuf_fromb(optbuf)) == NULL) 2028 fatal("%s: sshbuf_fromb failed", __func__); 2029 while (sshbuf_len(options) != 0) { 2030 sshbuf_free(option); 2031 option = NULL; 2032 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 || 2033 (r = sshbuf_froms(options, &option)) != 0) 2034 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 2035 printf(" %s", name); 2036 if (!in_critical && 2037 (strcmp(name, "permit-X11-forwarding") == 0 || 2038 strcmp(name, "permit-agent-forwarding") == 0 || 2039 strcmp(name, "permit-port-forwarding") == 0 || 2040 strcmp(name, "permit-pty") == 0 || 2041 strcmp(name, "permit-user-rc") == 0 || 2042 strcmp(name, "no-touch-required") == 0)) { 2043 printf("\n"); 2044 } else if (in_critical && 2045 (strcmp(name, "force-command") == 0 || 2046 strcmp(name, "source-address") == 0)) { 2047 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0) 2048 fatal("%s: buffer error: %s", 2049 __func__, ssh_err(r)); 2050 printf(" %s\n", arg); 2051 free(arg); 2052 } else { 2053 printf(" UNKNOWN OPTION (len %zu)\n", 2054 sshbuf_len(option)); 2055 sshbuf_reset(option); 2056 } 2057 free(name); 2058 if (sshbuf_len(option) != 0) 2059 fatal("Option corrupt: extra data at end"); 2060 } 2061 sshbuf_free(option); 2062 sshbuf_free(options); 2063 } 2064 2065 static void 2066 print_cert(struct sshkey *key) 2067 { 2068 char valid[64], *key_fp, *ca_fp; 2069 u_int i; 2070 2071 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT); 2072 ca_fp = sshkey_fingerprint(key->cert->signature_key, 2073 fingerprint_hash, SSH_FP_DEFAULT); 2074 if (key_fp == NULL || ca_fp == NULL) 2075 fatal("%s: sshkey_fingerprint fail", __func__); 2076 sshkey_format_cert_validity(key->cert, valid, sizeof(valid)); 2077 2078 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key), 2079 sshkey_cert_type(key)); 2080 printf(" Public key: %s %s\n", sshkey_type(key), key_fp); 2081 printf(" Signing CA: %s %s (using %s)\n", 2082 sshkey_type(key->cert->signature_key), ca_fp, 2083 key->cert->signature_type); 2084 printf(" Key ID: \"%s\"\n", key->cert->key_id); 2085 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial); 2086 printf(" Valid: %s\n", valid); 2087 printf(" Principals: "); 2088 if (key->cert->nprincipals == 0) 2089 printf("(none)\n"); 2090 else { 2091 for (i = 0; i < key->cert->nprincipals; i++) 2092 printf("\n %s", 2093 key->cert->principals[i]); 2094 printf("\n"); 2095 } 2096 printf(" Critical Options: "); 2097 if (sshbuf_len(key->cert->critical) == 0) 2098 printf("(none)\n"); 2099 else { 2100 printf("\n"); 2101 show_options(key->cert->critical, 1); 2102 } 2103 printf(" Extensions: "); 2104 if (sshbuf_len(key->cert->extensions) == 0) 2105 printf("(none)\n"); 2106 else { 2107 printf("\n"); 2108 show_options(key->cert->extensions, 0); 2109 } 2110 } 2111 2112 __dead static void 2113 do_show_cert(struct passwd *pw) 2114 { 2115 struct sshkey *key = NULL; 2116 struct stat st; 2117 int r, is_stdin = 0, ok = 0; 2118 FILE *f; 2119 char *cp, *line = NULL; 2120 const char *path; 2121 size_t linesize = 0; 2122 u_long lnum = 0; 2123 2124 if (!have_identity) 2125 ask_filename(pw, "Enter file in which the key is"); 2126 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) == -1) 2127 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 2128 2129 path = identity_file; 2130 if (strcmp(path, "-") == 0) { 2131 f = stdin; 2132 path = "(stdin)"; 2133 is_stdin = 1; 2134 } else if ((f = fopen(identity_file, "r")) == NULL) 2135 fatal("fopen %s: %s", identity_file, strerror(errno)); 2136 2137 while (getline(&line, &linesize, f) != -1) { 2138 lnum++; 2139 sshkey_free(key); 2140 key = NULL; 2141 /* Trim leading space and comments */ 2142 cp = line + strspn(line, " \t"); 2143 if (*cp == '#' || *cp == '\0') 2144 continue; 2145 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2146 fatal("sshkey_new"); 2147 if ((r = sshkey_read(key, &cp)) != 0) { 2148 error("%s:%lu: invalid key: %s", path, 2149 lnum, ssh_err(r)); 2150 continue; 2151 } 2152 if (!sshkey_is_cert(key)) { 2153 error("%s:%lu is not a certificate", path, lnum); 2154 continue; 2155 } 2156 ok = 1; 2157 if (!is_stdin && lnum == 1) 2158 printf("%s:\n", path); 2159 else 2160 printf("%s:%lu:\n", path, lnum); 2161 print_cert(key); 2162 } 2163 free(line); 2164 sshkey_free(key); 2165 fclose(f); 2166 exit(ok ? 0 : 1); 2167 } 2168 2169 static void 2170 load_krl(const char *path, struct ssh_krl **krlp) 2171 { 2172 struct sshbuf *krlbuf; 2173 int r; 2174 2175 if ((r = sshbuf_load_file(path, &krlbuf)) != 0) 2176 fatal("Unable to load KRL: %s", ssh_err(r)); 2177 /* XXX check sigs */ 2178 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 || 2179 *krlp == NULL) 2180 fatal("Invalid KRL file: %s", ssh_err(r)); 2181 sshbuf_free(krlbuf); 2182 } 2183 2184 static void 2185 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp, 2186 const char *file, u_long lnum) 2187 { 2188 char *tmp; 2189 size_t tlen; 2190 struct sshbuf *b; 2191 int r; 2192 2193 if (strncmp(cp, "SHA256:", 7) != 0) 2194 fatal("%s:%lu: unsupported hash algorithm", file, lnum); 2195 cp += 7; 2196 2197 /* 2198 * OpenSSH base64 hashes omit trailing '=' 2199 * characters; put them back for decode. 2200 */ 2201 tlen = strlen(cp); 2202 tmp = xmalloc(tlen + 4 + 1); 2203 strlcpy(tmp, cp, tlen + 1); 2204 while ((tlen % 4) != 0) { 2205 tmp[tlen++] = '='; 2206 tmp[tlen] = '\0'; 2207 } 2208 if ((b = sshbuf_new()) == NULL) 2209 fatal("%s: sshbuf_new failed", __func__); 2210 if ((r = sshbuf_b64tod(b, tmp)) != 0) 2211 fatal("%s:%lu: decode hash failed: %s", file, lnum, ssh_err(r)); 2212 free(tmp); 2213 *lenp = sshbuf_len(b); 2214 *blobp = xmalloc(*lenp); 2215 memcpy(*blobp, sshbuf_ptr(b), *lenp); 2216 sshbuf_free(b); 2217 } 2218 2219 static void 2220 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca, 2221 const struct sshkey *ca, struct ssh_krl *krl) 2222 { 2223 struct sshkey *key = NULL; 2224 u_long lnum = 0; 2225 char *path, *cp, *ep, *line = NULL; 2226 u_char *blob = NULL; 2227 size_t blen = 0, linesize = 0; 2228 unsigned long long serial, serial2; 2229 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r; 2230 FILE *krl_spec; 2231 2232 path = tilde_expand_filename(file, pw->pw_uid); 2233 if (strcmp(path, "-") == 0) { 2234 krl_spec = stdin; 2235 free(path); 2236 path = xstrdup("(standard input)"); 2237 } else if ((krl_spec = fopen(path, "r")) == NULL) 2238 fatal("fopen %s: %s", path, strerror(errno)); 2239 2240 if (!quiet) 2241 printf("Revoking from %s\n", path); 2242 while (getline(&line, &linesize, krl_spec) != -1) { 2243 lnum++; 2244 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0; 2245 cp = line + strspn(line, " \t"); 2246 /* Trim trailing space, comments and strip \n */ 2247 for (i = 0, r = -1; cp[i] != '\0'; i++) { 2248 if (cp[i] == '#' || cp[i] == '\n') { 2249 cp[i] = '\0'; 2250 break; 2251 } 2252 if (cp[i] == ' ' || cp[i] == '\t') { 2253 /* Remember the start of a span of whitespace */ 2254 if (r == -1) 2255 r = i; 2256 } else 2257 r = -1; 2258 } 2259 if (r != -1) 2260 cp[r] = '\0'; 2261 if (*cp == '\0') 2262 continue; 2263 if (strncasecmp(cp, "serial:", 7) == 0) { 2264 if (ca == NULL && !wild_ca) { 2265 fatal("revoking certificates by serial number " 2266 "requires specification of a CA key"); 2267 } 2268 cp += 7; 2269 cp = cp + strspn(cp, " \t"); 2270 errno = 0; 2271 serial = strtoull(cp, &ep, 0); 2272 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 2273 fatal("%s:%lu: invalid serial \"%s\"", 2274 path, lnum, cp); 2275 if (errno == ERANGE && serial == ULLONG_MAX) 2276 fatal("%s:%lu: serial out of range", 2277 path, lnum); 2278 serial2 = serial; 2279 if (*ep == '-') { 2280 cp = ep + 1; 2281 errno = 0; 2282 serial2 = strtoull(cp, &ep, 0); 2283 if (*cp == '\0' || *ep != '\0') 2284 fatal("%s:%lu: invalid serial \"%s\"", 2285 path, lnum, cp); 2286 if (errno == ERANGE && serial2 == ULLONG_MAX) 2287 fatal("%s:%lu: serial out of range", 2288 path, lnum); 2289 if (serial2 <= serial) 2290 fatal("%s:%lu: invalid serial range " 2291 "%llu:%llu", path, lnum, 2292 (unsigned long long)serial, 2293 (unsigned long long)serial2); 2294 } 2295 if (ssh_krl_revoke_cert_by_serial_range(krl, 2296 ca, serial, serial2) != 0) { 2297 fatal("%s: revoke serial failed", 2298 __func__); 2299 } 2300 } else if (strncasecmp(cp, "id:", 3) == 0) { 2301 if (ca == NULL && !wild_ca) { 2302 fatal("revoking certificates by key ID " 2303 "requires specification of a CA key"); 2304 } 2305 cp += 3; 2306 cp = cp + strspn(cp, " \t"); 2307 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2308 fatal("%s: revoke key ID failed", __func__); 2309 } else if (strncasecmp(cp, "hash:", 5) == 0) { 2310 cp += 5; 2311 cp = cp + strspn(cp, " \t"); 2312 hash_to_blob(cp, &blob, &blen, file, lnum); 2313 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2314 } else { 2315 if (strncasecmp(cp, "key:", 4) == 0) { 2316 cp += 4; 2317 cp = cp + strspn(cp, " \t"); 2318 was_explicit_key = 1; 2319 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2320 cp += 5; 2321 cp = cp + strspn(cp, " \t"); 2322 was_sha1 = 1; 2323 } else if (strncasecmp(cp, "sha256:", 7) == 0) { 2324 cp += 7; 2325 cp = cp + strspn(cp, " \t"); 2326 was_sha256 = 1; 2327 /* 2328 * Just try to process the line as a key. 2329 * Parsing will fail if it isn't. 2330 */ 2331 } 2332 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2333 fatal("sshkey_new"); 2334 if ((r = sshkey_read(key, &cp)) != 0) 2335 fatal("%s:%lu: invalid key: %s", 2336 path, lnum, ssh_err(r)); 2337 if (was_explicit_key) 2338 r = ssh_krl_revoke_key_explicit(krl, key); 2339 else if (was_sha1) { 2340 if (sshkey_fingerprint_raw(key, 2341 SSH_DIGEST_SHA1, &blob, &blen) != 0) { 2342 fatal("%s:%lu: fingerprint failed", 2343 file, lnum); 2344 } 2345 r = ssh_krl_revoke_key_sha1(krl, blob, blen); 2346 } else if (was_sha256) { 2347 if (sshkey_fingerprint_raw(key, 2348 SSH_DIGEST_SHA256, &blob, &blen) != 0) { 2349 fatal("%s:%lu: fingerprint failed", 2350 file, lnum); 2351 } 2352 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2353 } else 2354 r = ssh_krl_revoke_key(krl, key); 2355 if (r != 0) 2356 fatal("%s: revoke key failed: %s", 2357 __func__, ssh_err(r)); 2358 freezero(blob, blen); 2359 blob = NULL; 2360 blen = 0; 2361 sshkey_free(key); 2362 } 2363 } 2364 if (strcmp(path, "-") != 0) 2365 fclose(krl_spec); 2366 free(line); 2367 free(path); 2368 } 2369 2370 static void 2371 do_gen_krl(struct passwd *pw, int updating, const char *ca_key_path, 2372 unsigned long long krl_version, const char *krl_comment, 2373 int argc, char **argv) 2374 { 2375 struct ssh_krl *krl; 2376 struct stat sb; 2377 struct sshkey *ca = NULL; 2378 int i, r, wild_ca = 0; 2379 char *tmp; 2380 struct sshbuf *kbuf; 2381 2382 if (*identity_file == '\0') 2383 fatal("KRL generation requires an output file"); 2384 if (stat(identity_file, &sb) == -1) { 2385 if (errno != ENOENT) 2386 fatal("Cannot access KRL \"%s\": %s", 2387 identity_file, strerror(errno)); 2388 if (updating) 2389 fatal("KRL \"%s\" does not exist", identity_file); 2390 } 2391 if (ca_key_path != NULL) { 2392 if (strcasecmp(ca_key_path, "none") == 0) 2393 wild_ca = 1; 2394 else { 2395 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2396 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 2397 fatal("Cannot load CA public key %s: %s", 2398 tmp, ssh_err(r)); 2399 free(tmp); 2400 } 2401 } 2402 2403 if (updating) 2404 load_krl(identity_file, &krl); 2405 else if ((krl = ssh_krl_init()) == NULL) 2406 fatal("couldn't create KRL"); 2407 2408 if (krl_version != 0) 2409 ssh_krl_set_version(krl, krl_version); 2410 if (krl_comment != NULL) 2411 ssh_krl_set_comment(krl, krl_comment); 2412 2413 for (i = 0; i < argc; i++) 2414 update_krl_from_file(pw, argv[i], wild_ca, ca, krl); 2415 2416 if ((kbuf = sshbuf_new()) == NULL) 2417 fatal("sshbuf_new failed"); 2418 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0) 2419 fatal("Couldn't generate KRL"); 2420 if ((r = sshbuf_write_file(identity_file, kbuf)) != 0) 2421 fatal("write %s: %s", identity_file, strerror(errno)); 2422 sshbuf_free(kbuf); 2423 ssh_krl_free(krl); 2424 sshkey_free(ca); 2425 } 2426 2427 __dead static void 2428 do_check_krl(struct passwd *pw, int argc, char **argv) 2429 { 2430 int i, r, ret = 0; 2431 char *comment; 2432 struct ssh_krl *krl; 2433 struct sshkey *k; 2434 2435 if (*identity_file == '\0') 2436 fatal("KRL checking requires an input file"); 2437 load_krl(identity_file, &krl); 2438 for (i = 0; i < argc; i++) { 2439 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0) 2440 fatal("Cannot load public key %s: %s", 2441 argv[i], ssh_err(r)); 2442 r = ssh_krl_check_key(krl, k); 2443 printf("%s%s%s%s: %s\n", argv[i], 2444 *comment ? " (" : "", comment, *comment ? ")" : "", 2445 r == 0 ? "ok" : "REVOKED"); 2446 if (r != 0) 2447 ret = 1; 2448 sshkey_free(k); 2449 free(comment); 2450 } 2451 ssh_krl_free(krl); 2452 exit(ret); 2453 } 2454 2455 static struct sshkey * 2456 load_sign_key(const char *keypath, const struct sshkey *pubkey) 2457 { 2458 size_t i, slen, plen = strlen(keypath); 2459 char *privpath = xstrdup(keypath); 2460 const char *suffixes[] = { "-cert.pub", ".pub", NULL }; 2461 struct sshkey *ret = NULL, *privkey = NULL; 2462 int r; 2463 2464 /* 2465 * If passed a public key filename, then try to locate the correponding 2466 * private key. This lets us specify certificates on the command-line 2467 * and have ssh-keygen find the appropriate private key. 2468 */ 2469 for (i = 0; suffixes[i]; i++) { 2470 slen = strlen(suffixes[i]); 2471 if (plen <= slen || 2472 strcmp(privpath + plen - slen, suffixes[i]) != 0) 2473 continue; 2474 privpath[plen - slen] = '\0'; 2475 debug("%s: %s looks like a public key, using private key " 2476 "path %s instead", __func__, keypath, privpath); 2477 } 2478 if ((privkey = load_identity(privpath, NULL)) == NULL) { 2479 error("Couldn't load identity %s", keypath); 2480 goto done; 2481 } 2482 if (!sshkey_equal_public(pubkey, privkey)) { 2483 error("Public key %s doesn't match private %s", 2484 keypath, privpath); 2485 goto done; 2486 } 2487 if (sshkey_is_cert(pubkey) && !sshkey_is_cert(privkey)) { 2488 /* 2489 * Graft the certificate onto the private key to make 2490 * it capable of signing. 2491 */ 2492 if ((r = sshkey_to_certified(privkey)) != 0) { 2493 error("%s: sshkey_to_certified: %s", __func__, 2494 ssh_err(r)); 2495 goto done; 2496 } 2497 if ((r = sshkey_cert_copy(pubkey, privkey)) != 0) { 2498 error("%s: sshkey_cert_copy: %s", __func__, ssh_err(r)); 2499 goto done; 2500 } 2501 } 2502 /* success */ 2503 ret = privkey; 2504 privkey = NULL; 2505 done: 2506 sshkey_free(privkey); 2507 free(privpath); 2508 return ret; 2509 } 2510 2511 static int 2512 sign_one(struct sshkey *signkey, const char *filename, int fd, 2513 const char *sig_namespace, sshsig_signer *signer, void *signer_ctx) 2514 { 2515 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2516 int r = SSH_ERR_INTERNAL_ERROR, wfd = -1, oerrno; 2517 char *wfile = NULL, *asig = NULL, *fp = NULL; 2518 2519 if (!quiet) { 2520 if (fd == STDIN_FILENO) 2521 fprintf(stderr, "Signing data on standard input\n"); 2522 else 2523 fprintf(stderr, "Signing file %s\n", filename); 2524 } 2525 if (signer == NULL && sshkey_is_sk(signkey) && 2526 (signkey->sk_flags & SSH_SK_USER_PRESENCE_REQD)) { 2527 if ((fp = sshkey_fingerprint(signkey, fingerprint_hash, 2528 SSH_FP_DEFAULT)) == NULL) 2529 fatal("%s: sshkey_fingerprint failed", __func__); 2530 fprintf(stderr, "Confirm user presence for key %s %s\n", 2531 sshkey_type(signkey), fp); 2532 free(fp); 2533 } 2534 if ((r = sshsig_sign_fd(signkey, NULL, sk_provider, fd, sig_namespace, 2535 &sigbuf, signer, signer_ctx)) != 0) { 2536 error("Signing %s failed: %s", filename, ssh_err(r)); 2537 goto out; 2538 } 2539 if ((r = sshsig_armor(sigbuf, &abuf)) != 0) { 2540 error("%s: sshsig_armor: %s", __func__, ssh_err(r)); 2541 goto out; 2542 } 2543 if ((asig = sshbuf_dup_string(abuf)) == NULL) { 2544 error("%s: buffer error", __func__); 2545 r = SSH_ERR_ALLOC_FAIL; 2546 goto out; 2547 } 2548 2549 if (fd == STDIN_FILENO) { 2550 fputs(asig, stdout); 2551 fflush(stdout); 2552 } else { 2553 xasprintf(&wfile, "%s.sig", filename); 2554 if (confirm_overwrite(wfile)) { 2555 if ((wfd = open(wfile, O_WRONLY|O_CREAT|O_TRUNC, 2556 0666)) == -1) { 2557 oerrno = errno; 2558 error("Cannot open %s: %s", 2559 wfile, strerror(errno)); 2560 errno = oerrno; 2561 r = SSH_ERR_SYSTEM_ERROR; 2562 goto out; 2563 } 2564 if (atomicio(vwrite, wfd, asig, 2565 strlen(asig)) != strlen(asig)) { 2566 oerrno = errno; 2567 error("Cannot write to %s: %s", 2568 wfile, strerror(errno)); 2569 errno = oerrno; 2570 r = SSH_ERR_SYSTEM_ERROR; 2571 goto out; 2572 } 2573 if (!quiet) { 2574 fprintf(stderr, "Write signature to %s\n", 2575 wfile); 2576 } 2577 } 2578 } 2579 /* success */ 2580 r = 0; 2581 out: 2582 free(wfile); 2583 free(asig); 2584 sshbuf_free(abuf); 2585 sshbuf_free(sigbuf); 2586 if (wfd != -1) 2587 close(wfd); 2588 return r; 2589 } 2590 2591 static int 2592 sig_sign(const char *keypath, const char *sig_namespace, int argc, char **argv) 2593 { 2594 int i, fd = -1, r, ret = -1; 2595 int agent_fd = -1; 2596 struct sshkey *pubkey = NULL, *privkey = NULL, *signkey = NULL; 2597 sshsig_signer *signer = NULL; 2598 2599 /* Check file arguments. */ 2600 for (i = 0; i < argc; i++) { 2601 if (strcmp(argv[i], "-") != 0) 2602 continue; 2603 if (i > 0 || argc > 1) 2604 fatal("Cannot sign mix of paths and standard input"); 2605 } 2606 2607 if ((r = sshkey_load_public(keypath, &pubkey, NULL)) != 0) { 2608 error("Couldn't load public key %s: %s", keypath, ssh_err(r)); 2609 goto done; 2610 } 2611 2612 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 2613 debug("Couldn't get agent socket: %s", ssh_err(r)); 2614 else { 2615 if ((r = ssh_agent_has_key(agent_fd, pubkey)) == 0) 2616 signer = agent_signer; 2617 else 2618 debug("Couldn't find key in agent: %s", ssh_err(r)); 2619 } 2620 2621 if (signer == NULL) { 2622 /* Not using agent - try to load private key */ 2623 if ((privkey = load_sign_key(keypath, pubkey)) == NULL) 2624 goto done; 2625 signkey = privkey; 2626 } else { 2627 /* Will use key in agent */ 2628 signkey = pubkey; 2629 } 2630 2631 if (argc == 0) { 2632 if ((r = sign_one(signkey, "(stdin)", STDIN_FILENO, 2633 sig_namespace, signer, &agent_fd)) != 0) 2634 goto done; 2635 } else { 2636 for (i = 0; i < argc; i++) { 2637 if (strcmp(argv[i], "-") == 0) 2638 fd = STDIN_FILENO; 2639 else if ((fd = open(argv[i], O_RDONLY)) == -1) { 2640 error("Cannot open %s for signing: %s", 2641 argv[i], strerror(errno)); 2642 goto done; 2643 } 2644 if ((r = sign_one(signkey, argv[i], fd, sig_namespace, 2645 signer, &agent_fd)) != 0) 2646 goto done; 2647 if (fd != STDIN_FILENO) 2648 close(fd); 2649 fd = -1; 2650 } 2651 } 2652 2653 ret = 0; 2654 done: 2655 if (fd != -1 && fd != STDIN_FILENO) 2656 close(fd); 2657 sshkey_free(pubkey); 2658 sshkey_free(privkey); 2659 return ret; 2660 } 2661 2662 static int 2663 sig_verify(const char *signature, const char *sig_namespace, 2664 const char *principal, const char *allowed_keys, const char *revoked_keys) 2665 { 2666 int r, ret = -1; 2667 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2668 struct sshkey *sign_key = NULL; 2669 char *fp = NULL; 2670 struct sshkey_sig_details *sig_details = NULL; 2671 2672 memset(&sig_details, 0, sizeof(sig_details)); 2673 if ((r = sshbuf_load_file(signature, &abuf)) != 0) { 2674 error("Couldn't read signature file: %s", ssh_err(r)); 2675 goto done; 2676 } 2677 2678 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) { 2679 error("%s: sshsig_armor: %s", __func__, ssh_err(r)); 2680 goto done; 2681 } 2682 if ((r = sshsig_verify_fd(sigbuf, STDIN_FILENO, sig_namespace, 2683 &sign_key, &sig_details)) != 0) 2684 goto done; /* sshsig_verify() prints error */ 2685 2686 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash, 2687 SSH_FP_DEFAULT)) == NULL) 2688 fatal("%s: sshkey_fingerprint failed", __func__); 2689 debug("Valid (unverified) signature from key %s", fp); 2690 if (sig_details != NULL) { 2691 debug2("%s: signature details: counter = %u, flags = 0x%02x", 2692 __func__, sig_details->sk_counter, sig_details->sk_flags); 2693 } 2694 free(fp); 2695 fp = NULL; 2696 2697 if (revoked_keys != NULL) { 2698 if ((r = sshkey_check_revoked(sign_key, revoked_keys)) != 0) { 2699 debug3("sshkey_check_revoked failed: %s", ssh_err(r)); 2700 goto done; 2701 } 2702 } 2703 2704 if (allowed_keys != NULL && 2705 (r = sshsig_check_allowed_keys(allowed_keys, sign_key, 2706 principal, sig_namespace)) != 0) { 2707 debug3("sshsig_check_allowed_keys failed: %s", ssh_err(r)); 2708 goto done; 2709 } 2710 /* success */ 2711 ret = 0; 2712 done: 2713 if (!quiet) { 2714 if (ret == 0) { 2715 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash, 2716 SSH_FP_DEFAULT)) == NULL) { 2717 fatal("%s: sshkey_fingerprint failed", 2718 __func__); 2719 } 2720 if (principal == NULL) { 2721 printf("Good \"%s\" signature with %s key %s\n", 2722 sig_namespace, sshkey_type(sign_key), fp); 2723 2724 } else { 2725 printf("Good \"%s\" signature for %s with %s key %s\n", 2726 sig_namespace, principal, 2727 sshkey_type(sign_key), fp); 2728 } 2729 } else { 2730 printf("Could not verify signature.\n"); 2731 } 2732 } 2733 sshbuf_free(sigbuf); 2734 sshbuf_free(abuf); 2735 sshkey_free(sign_key); 2736 sshkey_sig_details_free(sig_details); 2737 free(fp); 2738 return ret; 2739 } 2740 2741 static int 2742 sig_find_principals(const char *signature, const char *allowed_keys) { 2743 int r, ret = -1; 2744 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2745 struct sshkey *sign_key = NULL; 2746 char *principals = NULL, *cp, *tmp; 2747 2748 if ((r = sshbuf_load_file(signature, &abuf)) != 0) { 2749 error("Couldn't read signature file: %s", ssh_err(r)); 2750 goto done; 2751 } 2752 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) { 2753 error("%s: sshsig_armor: %s", __func__, ssh_err(r)); 2754 goto done; 2755 } 2756 if ((r = sshsig_get_pubkey(sigbuf, &sign_key)) != 0) { 2757 error("%s: sshsig_get_pubkey: %s", 2758 __func__, ssh_err(r)); 2759 goto done; 2760 } 2761 if ((r = sshsig_find_principals(allowed_keys, sign_key, 2762 &principals)) != 0) { 2763 error("%s: sshsig_get_principal: %s", 2764 __func__, ssh_err(r)); 2765 goto done; 2766 } 2767 ret = 0; 2768 done: 2769 if (ret == 0 ) { 2770 /* Emit matching principals one per line */ 2771 tmp = principals; 2772 while ((cp = strsep(&tmp, ",")) != NULL && *cp != '\0') 2773 puts(cp); 2774 } else { 2775 fprintf(stderr, "No principal matched.\n"); 2776 } 2777 sshbuf_free(sigbuf); 2778 sshbuf_free(abuf); 2779 sshkey_free(sign_key); 2780 free(principals); 2781 return ret; 2782 } 2783 2784 static void 2785 do_moduli_gen(const char *out_file, char **opts, size_t nopts) 2786 { 2787 #ifdef WITH_OPENSSL 2788 /* Moduli generation/screening */ 2789 u_int32_t memory = 0; 2790 BIGNUM *start = NULL; 2791 int moduli_bits = 0; 2792 FILE *out; 2793 size_t i; 2794 const char *errstr; 2795 2796 /* Parse options */ 2797 for (i = 0; i < nopts; i++) { 2798 if (strncmp(opts[i], "memory=", 7) == 0) { 2799 memory = (u_int32_t)strtonum(opts[i]+7, 1, 2800 UINT_MAX, &errstr); 2801 if (errstr) { 2802 fatal("Memory limit is %s: %s", 2803 errstr, opts[i]+7); 2804 } 2805 } else if (strncmp(opts[i], "start=", 6) == 0) { 2806 /* XXX - also compare length against bits */ 2807 if (BN_hex2bn(&start, opts[i]+6) == 0) 2808 fatal("Invalid start point."); 2809 } else if (strncmp(opts[i], "bits=", 5) == 0) { 2810 moduli_bits = (int)strtonum(opts[i]+5, 1, 2811 INT_MAX, &errstr); 2812 if (errstr) { 2813 fatal("Invalid number: %s (%s)", 2814 opts[i]+12, errstr); 2815 } 2816 } else { 2817 fatal("Option \"%s\" is unsupported for moduli " 2818 "generation", opts[i]); 2819 } 2820 } 2821 2822 if ((out = fopen(out_file, "w")) == NULL) { 2823 fatal("Couldn't open modulus candidate file \"%s\": %s", 2824 out_file, strerror(errno)); 2825 } 2826 setvbuf(out, NULL, _IOLBF, 0); 2827 2828 if (moduli_bits == 0) 2829 moduli_bits = DEFAULT_BITS; 2830 if (gen_candidates(out, memory, moduli_bits, start) != 0) 2831 fatal("modulus candidate generation failed"); 2832 #else /* WITH_OPENSSL */ 2833 fatal("Moduli generation is not supported"); 2834 #endif /* WITH_OPENSSL */ 2835 } 2836 2837 static void 2838 do_moduli_screen(const char *out_file, char **opts, size_t nopts) 2839 { 2840 #ifdef WITH_OPENSSL 2841 /* Moduli generation/screening */ 2842 char *checkpoint = NULL; 2843 u_int32_t generator_wanted = 0; 2844 unsigned long start_lineno = 0, lines_to_process = 0; 2845 int prime_tests = 0; 2846 FILE *out, *in = stdin; 2847 size_t i; 2848 const char *errstr; 2849 2850 /* Parse options */ 2851 for (i = 0; i < nopts; i++) { 2852 if (strncmp(opts[i], "lines=", 6) == 0) { 2853 lines_to_process = strtoul(opts[i]+6, NULL, 10); 2854 } else if (strncmp(opts[i], "start-line=", 11) == 0) { 2855 start_lineno = strtoul(opts[i]+11, NULL, 10); 2856 } else if (strncmp(opts[i], "checkpoint=", 11) == 0) { 2857 checkpoint = xstrdup(opts[i]+11); 2858 } else if (strncmp(opts[i], "generator=", 10) == 0) { 2859 generator_wanted = (u_int32_t)strtonum( 2860 opts[i]+10, 1, UINT_MAX, &errstr); 2861 if (errstr != NULL) { 2862 fatal("Generator invalid: %s (%s)", 2863 opts[i]+10, errstr); 2864 } 2865 } else if (strncmp(opts[i], "prime-tests=", 12) == 0) { 2866 prime_tests = (int)strtonum(opts[i]+12, 1, 2867 INT_MAX, &errstr); 2868 if (errstr) { 2869 fatal("Invalid number: %s (%s)", 2870 opts[i]+12, errstr); 2871 } 2872 } else { 2873 fatal("Option \"%s\" is unsupported for moduli " 2874 "screening", opts[i]); 2875 } 2876 } 2877 2878 if (have_identity && strcmp(identity_file, "-") != 0) { 2879 if ((in = fopen(identity_file, "r")) == NULL) { 2880 fatal("Couldn't open modulus candidate " 2881 "file \"%s\": %s", identity_file, 2882 strerror(errno)); 2883 } 2884 } 2885 2886 if ((out = fopen(out_file, "a")) == NULL) { 2887 fatal("Couldn't open moduli file \"%s\": %s", 2888 out_file, strerror(errno)); 2889 } 2890 setvbuf(out, NULL, _IOLBF, 0); 2891 if (prime_test(in, out, prime_tests == 0 ? 100 : prime_tests, 2892 generator_wanted, checkpoint, 2893 start_lineno, lines_to_process) != 0) 2894 fatal("modulus screening failed"); 2895 #else /* WITH_OPENSSL */ 2896 fatal("Moduli screening is not supported"); 2897 #endif /* WITH_OPENSSL */ 2898 } 2899 2900 static char * 2901 private_key_passphrase(void) 2902 { 2903 char *passphrase1, *passphrase2; 2904 2905 /* Ask for a passphrase (twice). */ 2906 if (identity_passphrase) 2907 passphrase1 = xstrdup(identity_passphrase); 2908 else if (identity_new_passphrase) 2909 passphrase1 = xstrdup(identity_new_passphrase); 2910 else { 2911 passphrase_again: 2912 passphrase1 = 2913 read_passphrase("Enter passphrase (empty for no " 2914 "passphrase): ", RP_ALLOW_STDIN); 2915 passphrase2 = read_passphrase("Enter same passphrase again: ", 2916 RP_ALLOW_STDIN); 2917 if (strcmp(passphrase1, passphrase2) != 0) { 2918 /* 2919 * The passphrases do not match. Clear them and 2920 * retry. 2921 */ 2922 freezero(passphrase1, strlen(passphrase1)); 2923 freezero(passphrase2, strlen(passphrase2)); 2924 printf("Passphrases do not match. Try again.\n"); 2925 goto passphrase_again; 2926 } 2927 /* Clear the other copy of the passphrase. */ 2928 freezero(passphrase2, strlen(passphrase2)); 2929 } 2930 return passphrase1; 2931 } 2932 2933 static const char * 2934 skip_ssh_url_preamble(const char *s) 2935 { 2936 if (strncmp(s, "ssh://", 6) == 0) 2937 return s + 6; 2938 else if (strncmp(s, "ssh:", 4) == 0) 2939 return s + 4; 2940 return s; 2941 } 2942 2943 static int 2944 do_download_sk(const char *skprovider, const char *device) 2945 { 2946 struct sshkey **keys; 2947 size_t nkeys, i; 2948 int r, ok = -1; 2949 char *fp, *pin, *pass = NULL, *path, *pubpath; 2950 const char *ext; 2951 2952 if (skprovider == NULL) 2953 fatal("Cannot download keys without provider"); 2954 2955 pin = read_passphrase("Enter PIN for authenticator: ", RP_ALLOW_STDIN); 2956 if ((r = sshsk_load_resident(skprovider, device, pin, 2957 &keys, &nkeys)) != 0) { 2958 freezero(pin, strlen(pin)); 2959 error("Unable to load resident keys: %s", ssh_err(r)); 2960 return -1; 2961 } 2962 if (nkeys == 0) 2963 logit("No keys to download"); 2964 freezero(pin, strlen(pin)); 2965 2966 for (i = 0; i < nkeys; i++) { 2967 if (keys[i]->type != KEY_ECDSA_SK && 2968 keys[i]->type != KEY_ED25519_SK) { 2969 error("Unsupported key type %s (%d)", 2970 sshkey_type(keys[i]), keys[i]->type); 2971 continue; 2972 } 2973 if ((fp = sshkey_fingerprint(keys[i], 2974 fingerprint_hash, SSH_FP_DEFAULT)) == NULL) 2975 fatal("%s: sshkey_fingerprint failed", __func__); 2976 debug("%s: key %zu: %s %s %s (flags 0x%02x)", __func__, i, 2977 sshkey_type(keys[i]), fp, keys[i]->sk_application, 2978 keys[i]->sk_flags); 2979 ext = skip_ssh_url_preamble(keys[i]->sk_application); 2980 xasprintf(&path, "id_%s_rk%s%s", 2981 keys[i]->type == KEY_ECDSA_SK ? "ecdsa_sk" : "ed25519_sk", 2982 *ext == '\0' ? "" : "_", ext); 2983 2984 /* If the file already exists, ask the user to confirm. */ 2985 if (!confirm_overwrite(path)) { 2986 free(path); 2987 break; 2988 } 2989 2990 /* Save the key with the application string as the comment */ 2991 if (pass == NULL) 2992 pass = private_key_passphrase(); 2993 if ((r = sshkey_save_private(keys[i], path, pass, 2994 keys[i]->sk_application, private_key_format, 2995 openssh_format_cipher, rounds)) != 0) { 2996 error("Saving key \"%s\" failed: %s", 2997 path, ssh_err(r)); 2998 free(path); 2999 break; 3000 } 3001 if (!quiet) { 3002 printf("Saved %s key%s%s to %s\n", 3003 sshkey_type(keys[i]), 3004 *ext != '\0' ? " " : "", 3005 *ext != '\0' ? keys[i]->sk_application : "", 3006 path); 3007 } 3008 3009 /* Save public key too */ 3010 xasprintf(&pubpath, "%s.pub", path); 3011 free(path); 3012 if ((r = sshkey_save_public(keys[i], pubpath, 3013 keys[i]->sk_application)) != 0) { 3014 free(pubpath); 3015 error("Saving public key \"%s\" failed: %s", 3016 pubpath, ssh_err(r)); 3017 break; 3018 } 3019 free(pubpath); 3020 } 3021 3022 if (i >= nkeys) 3023 ok = 0; /* success */ 3024 if (pass != NULL) 3025 freezero(pass, strlen(pass)); 3026 for (i = 0; i < nkeys; i++) 3027 sshkey_free(keys[i]); 3028 free(keys); 3029 return ok ? 0 : -1; 3030 } 3031 3032 __dead static void 3033 usage(void) 3034 { 3035 fprintf(stderr, 3036 "usage: ssh-keygen [-q] [-b bits] [-C comment] [-f output_keyfile] [-m format]\n" 3037 " [-t dsa | ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa]\n" 3038 " [-N new_passphrase] [-O option] [-w provider]\n" 3039 " ssh-keygen -p [-f keyfile] [-m format] [-N new_passphrase]\n" 3040 " [-P old_passphrase]\n" 3041 " ssh-keygen -i [-f input_keyfile] [-m key_format]\n" 3042 " ssh-keygen -e [-f input_keyfile] [-m key_format]\n" 3043 " ssh-keygen -y [-f input_keyfile]\n" 3044 " ssh-keygen -c [-C comment] [-f keyfile] [-P passphrase]\n" 3045 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n" 3046 " ssh-keygen -B [-f input_keyfile]\n"); 3047 #ifdef ENABLE_PKCS11 3048 fprintf(stderr, 3049 " ssh-keygen -D pkcs11\n"); 3050 #endif 3051 fprintf(stderr, 3052 " ssh-keygen -F hostname [-lv] [-f known_hosts_file]\n" 3053 " ssh-keygen -H [-f known_hosts_file]\n" 3054 " ssh-keygen -K [-w provider]\n" 3055 " ssh-keygen -R hostname [-f known_hosts_file]\n" 3056 " ssh-keygen -r hostname [-g] [-f input_keyfile]\n" 3057 #ifdef WITH_OPENSSL 3058 " ssh-keygen -M generate [-O option] output_file\n" 3059 " ssh-keygen -M screen [-f input_file] [-O option] output_file\n" 3060 #endif 3061 " ssh-keygen -I certificate_identity -s ca_key [-hU] [-D pkcs11_provider]\n" 3062 " [-n principals] [-O option] [-V validity_interval]\n" 3063 " [-z serial_number] file ...\n" 3064 " ssh-keygen -L [-f input_keyfile]\n" 3065 " ssh-keygen -A [-f prefix_path]\n" 3066 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n" 3067 " file ...\n" 3068 " ssh-keygen -Q -f krl_file file ...\n" 3069 " ssh-keygen -Y find-principals -s signature_file -f allowed_signers_file\n" 3070 " ssh-keygen -Y check-novalidate -n namespace -s signature_file\n" 3071 " ssh-keygen -Y sign -f key_file -n namespace file ...\n" 3072 " ssh-keygen -Y verify -f allowed_signers_file -I signer_identity\n" 3073 " -n namespace -s signature_file [-r revocation_file]\n"); 3074 exit(1); 3075 } 3076 3077 /* 3078 * Main program for key management. 3079 */ 3080 int 3081 main(int argc, char **argv) 3082 { 3083 char dotsshdir[PATH_MAX], comment[1024], *passphrase; 3084 char *rr_hostname = NULL, *ep, *fp, *ra; 3085 struct sshkey *private, *public; 3086 struct passwd *pw; 3087 struct stat st; 3088 int r, opt, type; 3089 int change_passphrase = 0, change_comment = 0, show_cert = 0; 3090 int find_host = 0, delete_host = 0, hash_hosts = 0; 3091 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 3092 int prefer_agent = 0, convert_to = 0, convert_from = 0; 3093 int print_public = 0, print_generic = 0, cert_serial_autoinc = 0; 3094 int do_gen_candidates = 0, do_screen_candidates = 0, download_sk = 0; 3095 unsigned long long cert_serial = 0; 3096 char *identity_comment = NULL, *ca_key_path = NULL, **opts = NULL; 3097 char *sk_application = NULL, *sk_device = NULL, *sk_user = NULL; 3098 char *sk_attestaion_path = NULL; 3099 struct sshbuf *challenge = NULL, *attest = NULL; 3100 size_t i, nopts = 0; 3101 u_int32_t bits = 0; 3102 uint8_t sk_flags = SSH_SK_USER_PRESENCE_REQD; 3103 const char *errstr; 3104 int log_level = SYSLOG_LEVEL_INFO; 3105 char *sign_op = NULL; 3106 3107 extern int optind; 3108 extern char *optarg; 3109 3110 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 3111 sanitise_stdfd(); 3112 3113 #ifdef WITH_OPENSSL 3114 OpenSSL_add_all_algorithms(); 3115 #endif 3116 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 3117 3118 setlocale(LC_CTYPE, ""); 3119 3120 /* we need this for the home * directory. */ 3121 pw = getpwuid(getuid()); 3122 if (!pw) 3123 fatal("No user exists for uid %lu", (u_long)getuid()); 3124 if (gethostname(hostname, sizeof(hostname)) == -1) 3125 fatal("gethostname: %s", strerror(errno)); 3126 3127 sk_provider = getenv("SSH_SK_PROVIDER"); 3128 3129 /* Remaining characters: dGjJSTWx */ 3130 while ((opt = getopt(argc, argv, "ABHKLQUXceghiklopquvy" 3131 "C:D:E:F:I:M:N:O:P:R:V:Y:Z:" 3132 "a:b:f:g:m:n:r:s:t:w:z:")) != -1) { 3133 switch (opt) { 3134 case 'A': 3135 gen_all_hostkeys = 1; 3136 break; 3137 case 'b': 3138 bits = (u_int32_t)strtonum(optarg, 1, UINT32_MAX, 3139 &errstr); 3140 if (errstr) 3141 fatal("Bits has bad value %s (%s)", 3142 optarg, errstr); 3143 break; 3144 case 'E': 3145 fingerprint_hash = ssh_digest_alg_by_name(optarg); 3146 if (fingerprint_hash == -1) 3147 fatal("Invalid hash algorithm \"%s\"", optarg); 3148 break; 3149 case 'F': 3150 find_host = 1; 3151 rr_hostname = optarg; 3152 break; 3153 case 'H': 3154 hash_hosts = 1; 3155 break; 3156 case 'I': 3157 cert_key_id = optarg; 3158 break; 3159 case 'R': 3160 delete_host = 1; 3161 rr_hostname = optarg; 3162 break; 3163 case 'L': 3164 show_cert = 1; 3165 break; 3166 case 'l': 3167 print_fingerprint = 1; 3168 break; 3169 case 'B': 3170 print_bubblebabble = 1; 3171 break; 3172 case 'm': 3173 if (strcasecmp(optarg, "RFC4716") == 0 || 3174 strcasecmp(optarg, "ssh2") == 0) { 3175 convert_format = FMT_RFC4716; 3176 break; 3177 } 3178 if (strcasecmp(optarg, "PKCS8") == 0) { 3179 convert_format = FMT_PKCS8; 3180 private_key_format = SSHKEY_PRIVATE_PKCS8; 3181 break; 3182 } 3183 if (strcasecmp(optarg, "PEM") == 0) { 3184 convert_format = FMT_PEM; 3185 private_key_format = SSHKEY_PRIVATE_PEM; 3186 break; 3187 } 3188 fatal("Unsupported conversion format \"%s\"", optarg); 3189 case 'n': 3190 cert_principals = optarg; 3191 break; 3192 case 'o': 3193 /* no-op; new format is already the default */ 3194 break; 3195 case 'p': 3196 change_passphrase = 1; 3197 break; 3198 case 'c': 3199 change_comment = 1; 3200 break; 3201 case 'f': 3202 if (strlcpy(identity_file, optarg, 3203 sizeof(identity_file)) >= sizeof(identity_file)) 3204 fatal("Identity filename too long"); 3205 have_identity = 1; 3206 break; 3207 case 'g': 3208 print_generic = 1; 3209 break; 3210 case 'K': 3211 download_sk = 1; 3212 break; 3213 case 'P': 3214 identity_passphrase = optarg; 3215 break; 3216 case 'N': 3217 identity_new_passphrase = optarg; 3218 break; 3219 case 'Q': 3220 check_krl = 1; 3221 break; 3222 case 'O': 3223 opts = xrecallocarray(opts, nopts, nopts + 1, 3224 sizeof(*opts)); 3225 opts[nopts++] = xstrdup(optarg); 3226 break; 3227 case 'Z': 3228 openssh_format_cipher = optarg; 3229 break; 3230 case 'C': 3231 identity_comment = optarg; 3232 break; 3233 case 'q': 3234 quiet = 1; 3235 break; 3236 case 'e': 3237 /* export key */ 3238 convert_to = 1; 3239 break; 3240 case 'h': 3241 cert_key_type = SSH2_CERT_TYPE_HOST; 3242 certflags_flags = 0; 3243 break; 3244 case 'k': 3245 gen_krl = 1; 3246 break; 3247 case 'i': 3248 case 'X': 3249 /* import key */ 3250 convert_from = 1; 3251 break; 3252 case 'y': 3253 print_public = 1; 3254 break; 3255 case 's': 3256 ca_key_path = optarg; 3257 break; 3258 case 't': 3259 key_type_name = optarg; 3260 break; 3261 case 'D': 3262 pkcs11provider = optarg; 3263 break; 3264 case 'U': 3265 prefer_agent = 1; 3266 break; 3267 case 'u': 3268 update_krl = 1; 3269 break; 3270 case 'v': 3271 if (log_level == SYSLOG_LEVEL_INFO) 3272 log_level = SYSLOG_LEVEL_DEBUG1; 3273 else { 3274 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 3275 log_level < SYSLOG_LEVEL_DEBUG3) 3276 log_level++; 3277 } 3278 break; 3279 case 'r': 3280 rr_hostname = optarg; 3281 break; 3282 case 'a': 3283 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr); 3284 if (errstr) 3285 fatal("Invalid number: %s (%s)", 3286 optarg, errstr); 3287 break; 3288 case 'V': 3289 parse_cert_times(optarg); 3290 break; 3291 case 'Y': 3292 sign_op = optarg; 3293 break; 3294 case 'w': 3295 sk_provider = optarg; 3296 break; 3297 case 'z': 3298 errno = 0; 3299 if (*optarg == '+') { 3300 cert_serial_autoinc = 1; 3301 optarg++; 3302 } 3303 cert_serial = strtoull(optarg, &ep, 10); 3304 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 3305 (errno == ERANGE && cert_serial == ULLONG_MAX)) 3306 fatal("Invalid serial number \"%s\"", optarg); 3307 break; 3308 case 'M': 3309 if (strcmp(optarg, "generate") == 0) 3310 do_gen_candidates = 1; 3311 else if (strcmp(optarg, "screen") == 0) 3312 do_screen_candidates = 1; 3313 else 3314 fatal("Unsupported moduli option %s", optarg); 3315 break; 3316 case '?': 3317 default: 3318 usage(); 3319 } 3320 } 3321 3322 if (sk_provider == NULL) 3323 sk_provider = "internal"; 3324 3325 /* reinit */ 3326 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 3327 3328 argv += optind; 3329 argc -= optind; 3330 3331 if (sign_op != NULL) { 3332 if (strncmp(sign_op, "find-principals", 15) == 0) { 3333 if (ca_key_path == NULL) { 3334 error("Too few arguments for find-principals:" 3335 "missing signature file"); 3336 exit(1); 3337 } 3338 if (!have_identity) { 3339 error("Too few arguments for find-principals:" 3340 "missing allowed keys file"); 3341 exit(1); 3342 } 3343 return sig_find_principals(ca_key_path, identity_file); 3344 } else if (strncmp(sign_op, "sign", 4) == 0) { 3345 if (cert_principals == NULL || 3346 *cert_principals == '\0') { 3347 error("Too few arguments for sign: " 3348 "missing namespace"); 3349 exit(1); 3350 } 3351 if (!have_identity) { 3352 error("Too few arguments for sign: " 3353 "missing key"); 3354 exit(1); 3355 } 3356 return sig_sign(identity_file, cert_principals, 3357 argc, argv); 3358 } else if (strncmp(sign_op, "check-novalidate", 16) == 0) { 3359 if (ca_key_path == NULL) { 3360 error("Too few arguments for check-novalidate: " 3361 "missing signature file"); 3362 exit(1); 3363 } 3364 return sig_verify(ca_key_path, cert_principals, 3365 NULL, NULL, NULL); 3366 } else if (strncmp(sign_op, "verify", 6) == 0) { 3367 if (cert_principals == NULL || 3368 *cert_principals == '\0') { 3369 error("Too few arguments for verify: " 3370 "missing namespace"); 3371 exit(1); 3372 } 3373 if (ca_key_path == NULL) { 3374 error("Too few arguments for verify: " 3375 "missing signature file"); 3376 exit(1); 3377 } 3378 if (!have_identity) { 3379 error("Too few arguments for sign: " 3380 "missing allowed keys file"); 3381 exit(1); 3382 } 3383 if (cert_key_id == NULL) { 3384 error("Too few arguments for verify: " 3385 "missing principal ID"); 3386 exit(1); 3387 } 3388 return sig_verify(ca_key_path, cert_principals, 3389 cert_key_id, identity_file, rr_hostname); 3390 } 3391 error("Unsupported operation for -Y: \"%s\"", sign_op); 3392 usage(); 3393 /* NOTREACHED */ 3394 } 3395 3396 if (ca_key_path != NULL) { 3397 if (argc < 1 && !gen_krl) { 3398 error("Too few arguments."); 3399 usage(); 3400 } 3401 } else if (argc > 0 && !gen_krl && !check_krl && 3402 !do_gen_candidates && !do_screen_candidates) { 3403 error("Too many arguments."); 3404 usage(); 3405 } 3406 if (change_passphrase && change_comment) { 3407 error("Can only have one of -p and -c."); 3408 usage(); 3409 } 3410 if (print_fingerprint && (delete_host || hash_hosts)) { 3411 error("Cannot use -l with -H or -R."); 3412 usage(); 3413 } 3414 if (gen_krl) { 3415 do_gen_krl(pw, update_krl, ca_key_path, 3416 cert_serial, identity_comment, argc, argv); 3417 return (0); 3418 } 3419 if (check_krl) { 3420 do_check_krl(pw, argc, argv); 3421 return (0); 3422 } 3423 if (ca_key_path != NULL) { 3424 if (cert_key_id == NULL) 3425 fatal("Must specify key id (-I) when certifying"); 3426 for (i = 0; i < nopts; i++) 3427 add_cert_option(opts[i]); 3428 do_ca_sign(pw, ca_key_path, prefer_agent, 3429 cert_serial, cert_serial_autoinc, argc, argv); 3430 } 3431 if (show_cert) 3432 do_show_cert(pw); 3433 if (delete_host || hash_hosts || find_host) { 3434 do_known_hosts(pw, rr_hostname, find_host, 3435 delete_host, hash_hosts); 3436 } 3437 if (pkcs11provider != NULL) 3438 do_download(pw); 3439 if (download_sk) { 3440 for (i = 0; i < nopts; i++) { 3441 if (strncasecmp(opts[i], "device=", 7) == 0) { 3442 sk_device = xstrdup(opts[i] + 7); 3443 } else { 3444 fatal("Option \"%s\" is unsupported for " 3445 "FIDO authenticator download", opts[i]); 3446 } 3447 } 3448 return do_download_sk(sk_provider, sk_device); 3449 } 3450 if (print_fingerprint || print_bubblebabble) 3451 do_fingerprint(pw); 3452 if (change_passphrase) 3453 do_change_passphrase(pw); 3454 if (change_comment) 3455 do_change_comment(pw, identity_comment); 3456 #ifdef WITH_OPENSSL 3457 if (convert_to) 3458 do_convert_to(pw); 3459 if (convert_from) 3460 do_convert_from(pw); 3461 #else /* WITH_OPENSSL */ 3462 if (convert_to || convert_from) 3463 fatal("key conversion disabled at compile time"); 3464 #endif /* WITH_OPENSSL */ 3465 if (print_public) 3466 do_print_public(pw); 3467 if (rr_hostname != NULL) { 3468 unsigned int n = 0; 3469 3470 if (have_identity) { 3471 n = do_print_resource_record(pw, identity_file, 3472 rr_hostname, print_generic); 3473 if (n == 0) 3474 fatal("%s: %s", identity_file, strerror(errno)); 3475 exit(0); 3476 } else { 3477 3478 n += do_print_resource_record(pw, 3479 _PATH_HOST_RSA_KEY_FILE, rr_hostname, 3480 print_generic); 3481 n += do_print_resource_record(pw, 3482 _PATH_HOST_DSA_KEY_FILE, rr_hostname, 3483 print_generic); 3484 n += do_print_resource_record(pw, 3485 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname, 3486 print_generic); 3487 n += do_print_resource_record(pw, 3488 _PATH_HOST_ED25519_KEY_FILE, rr_hostname, 3489 print_generic); 3490 n += do_print_resource_record(pw, 3491 _PATH_HOST_XMSS_KEY_FILE, rr_hostname, 3492 print_generic); 3493 if (n == 0) 3494 fatal("no keys found."); 3495 exit(0); 3496 } 3497 } 3498 3499 if (do_gen_candidates || do_screen_candidates) { 3500 if (argc <= 0) 3501 fatal("No output file specified"); 3502 else if (argc > 1) 3503 fatal("Too many output files specified"); 3504 } 3505 if (do_gen_candidates) { 3506 do_moduli_gen(argv[0], opts, nopts); 3507 return 0; 3508 } 3509 if (do_screen_candidates) { 3510 do_moduli_screen(argv[0], opts, nopts); 3511 return 0; 3512 } 3513 3514 if (gen_all_hostkeys) { 3515 do_gen_all_hostkeys(pw); 3516 return (0); 3517 } 3518 3519 if (key_type_name == NULL) 3520 key_type_name = DEFAULT_KEY_TYPE_NAME; 3521 3522 type = sshkey_type_from_name(key_type_name); 3523 type_bits_valid(type, key_type_name, &bits); 3524 3525 if (!quiet) 3526 printf("Generating public/private %s key pair.\n", 3527 key_type_name); 3528 switch (type) { 3529 case KEY_ECDSA_SK: 3530 case KEY_ED25519_SK: 3531 for (i = 0; i < nopts; i++) { 3532 if (strcasecmp(opts[i], "no-touch-required") == 0) { 3533 sk_flags &= ~SSH_SK_USER_PRESENCE_REQD; 3534 } else if (strcasecmp(opts[i], "resident") == 0) { 3535 sk_flags |= SSH_SK_RESIDENT_KEY; 3536 } else if (strncasecmp(opts[i], "device=", 7) == 0) { 3537 sk_device = xstrdup(opts[i] + 7); 3538 } else if (strncasecmp(opts[i], "user=", 5) == 0) { 3539 sk_user = xstrdup(opts[i] + 5); 3540 } else if (strncasecmp(opts[i], "challenge=", 10) == 0) { 3541 if ((r = sshbuf_load_file(opts[i] + 10, 3542 &challenge)) != 0) { 3543 fatal("Unable to load FIDO enrollment " 3544 "challenge \"%s\": %s", 3545 opts[i] + 10, ssh_err(r)); 3546 } 3547 } else if (strncasecmp(opts[i], 3548 "write-attestation=", 18) == 0) { 3549 sk_attestaion_path = opts[i] + 18; 3550 } else if (strncasecmp(opts[i], 3551 "application=", 12) == 0) { 3552 sk_application = xstrdup(opts[i] + 12); 3553 if (strncmp(sk_application, "ssh:", 4) != 0) { 3554 fatal("FIDO application string must " 3555 "begin with \"ssh:\""); 3556 } 3557 } else { 3558 fatal("Option \"%s\" is unsupported for " 3559 "FIDO authenticator enrollment", opts[i]); 3560 } 3561 } 3562 if (!quiet) { 3563 printf("You may need to touch your authenticator " 3564 "to authorize key generation.\n"); 3565 } 3566 passphrase = NULL; 3567 if ((attest = sshbuf_new()) == NULL) 3568 fatal("sshbuf_new failed"); 3569 for (i = 0 ; ; i++) { 3570 fflush(stdout); 3571 r = sshsk_enroll(type, sk_provider, sk_device, 3572 sk_application == NULL ? "ssh:" : sk_application, 3573 sk_user, sk_flags, passphrase, challenge, 3574 &private, attest); 3575 if (r == 0) 3576 break; 3577 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 3578 fatal("Key enrollment failed: %s", ssh_err(r)); 3579 else if (i > 0) 3580 error("PIN incorrect"); 3581 if (passphrase != NULL) { 3582 freezero(passphrase, strlen(passphrase)); 3583 passphrase = NULL; 3584 } 3585 if (i >= 3) 3586 fatal("Too many incorrect PINs"); 3587 passphrase = read_passphrase("Enter PIN for " 3588 "authenticator: ", RP_ALLOW_STDIN); 3589 } 3590 if (passphrase != NULL) { 3591 freezero(passphrase, strlen(passphrase)); 3592 passphrase = NULL; 3593 } 3594 break; 3595 default: 3596 if ((r = sshkey_generate(type, bits, &private)) != 0) 3597 fatal("sshkey_generate failed"); 3598 break; 3599 } 3600 if ((r = sshkey_from_private(private, &public)) != 0) 3601 fatal("sshkey_from_private failed: %s\n", ssh_err(r)); 3602 3603 if (!have_identity) 3604 ask_filename(pw, "Enter file in which to save the key"); 3605 3606 /* Create ~/.ssh directory if it doesn't already exist. */ 3607 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", 3608 pw->pw_dir, _PATH_SSH_USER_DIR); 3609 if (strstr(identity_file, dotsshdir) != NULL) { 3610 if (stat(dotsshdir, &st) == -1) { 3611 if (errno != ENOENT) { 3612 error("Could not stat %s: %s", dotsshdir, 3613 strerror(errno)); 3614 } else if (mkdir(dotsshdir, 0700) == -1) { 3615 error("Could not create directory '%s': %s", 3616 dotsshdir, strerror(errno)); 3617 } else if (!quiet) 3618 printf("Created directory '%s'.\n", dotsshdir); 3619 } 3620 } 3621 /* If the file already exists, ask the user to confirm. */ 3622 if (!confirm_overwrite(identity_file)) 3623 exit(1); 3624 3625 /* Determine the passphrase for the private key */ 3626 passphrase = private_key_passphrase(); 3627 if (identity_comment) { 3628 strlcpy(comment, identity_comment, sizeof(comment)); 3629 } else { 3630 /* Create default comment field for the passphrase. */ 3631 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 3632 } 3633 3634 /* Save the key with the given passphrase and comment. */ 3635 if ((r = sshkey_save_private(private, identity_file, passphrase, 3636 comment, private_key_format, openssh_format_cipher, rounds)) != 0) { 3637 error("Saving key \"%s\" failed: %s", 3638 identity_file, ssh_err(r)); 3639 freezero(passphrase, strlen(passphrase)); 3640 exit(1); 3641 } 3642 freezero(passphrase, strlen(passphrase)); 3643 sshkey_free(private); 3644 3645 if (!quiet) { 3646 printf("Your identification has been saved in %s\n", 3647 identity_file); 3648 } 3649 3650 strlcat(identity_file, ".pub", sizeof(identity_file)); 3651 if ((r = sshkey_save_public(public, identity_file, comment)) != 0) { 3652 fatal("Unable to save public key to %s: %s", 3653 identity_file, strerror(errno)); 3654 } 3655 3656 if (!quiet) { 3657 fp = sshkey_fingerprint(public, fingerprint_hash, 3658 SSH_FP_DEFAULT); 3659 ra = sshkey_fingerprint(public, fingerprint_hash, 3660 SSH_FP_RANDOMART); 3661 if (fp == NULL || ra == NULL) 3662 fatal("sshkey_fingerprint failed"); 3663 printf("Your public key has been saved in %s\n", 3664 identity_file); 3665 printf("The key fingerprint is:\n"); 3666 printf("%s %s\n", fp, comment); 3667 printf("The key's randomart image is:\n"); 3668 printf("%s\n", ra); 3669 free(ra); 3670 free(fp); 3671 } 3672 3673 if (sk_attestaion_path != NULL) { 3674 if (attest == NULL || sshbuf_len(attest) == 0) { 3675 fatal("Enrollment did not return attestation " 3676 "certificate"); 3677 } 3678 if ((r = sshbuf_write_file(sk_attestaion_path, attest)) != 0) { 3679 fatal("Unable to write attestation certificate " 3680 "\"%s\": %s", sk_attestaion_path, ssh_err(r)); 3681 } 3682 if (!quiet) { 3683 printf("Your FIDO attestation certificate has been " 3684 "saved in %s\n", sk_attestaion_path); 3685 } 3686 } 3687 sshbuf_free(attest); 3688 sshkey_free(public); 3689 3690 exit(0); 3691 } 3692