1 /* $OpenBSD: ssh-keygen.c,v 1.472 2024/01/11 01:45:36 djm Exp $ */ 2 /* 3 * Author: Tatu Ylonen <ylo@cs.hut.fi> 4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * Identity and host key generation and maintenance. 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 */ 14 15 #include <sys/types.h> 16 #include <sys/socket.h> 17 #include <sys/stat.h> 18 19 #ifdef WITH_OPENSSL 20 #include <openssl/evp.h> 21 #include <openssl/pem.h> 22 #endif 23 24 #include <stdint.h> 25 #include <errno.h> 26 #include <fcntl.h> 27 #include <netdb.h> 28 #include <pwd.h> 29 #include <stdarg.h> 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include <string.h> 33 #include <unistd.h> 34 #include <limits.h> 35 #include <locale.h> 36 37 #include "xmalloc.h" 38 #include "sshkey.h" 39 #include "authfile.h" 40 #include "sshbuf.h" 41 #include "pathnames.h" 42 #include "log.h" 43 #include "misc.h" 44 #include "match.h" 45 #include "hostfile.h" 46 #include "dns.h" 47 #include "ssh.h" 48 #include "ssh2.h" 49 #include "ssherr.h" 50 #include "atomicio.h" 51 #include "krl.h" 52 #include "digest.h" 53 #include "utf8.h" 54 #include "authfd.h" 55 #include "sshsig.h" 56 #include "ssh-sk.h" 57 #include "sk-api.h" /* XXX for SSH_SK_USER_PRESENCE_REQD; remove */ 58 #include "cipher.h" 59 60 #ifdef ENABLE_PKCS11 61 #include "ssh-pkcs11.h" 62 #endif 63 64 #define DEFAULT_KEY_TYPE_NAME "ed25519" 65 66 /* 67 * Default number of bits in the RSA, DSA and ECDSA keys. These value can be 68 * overridden on the command line. 69 * 70 * These values, with the exception of DSA, provide security equivalent to at 71 * least 128 bits of security according to NIST Special Publication 800-57: 72 * Recommendation for Key Management Part 1 rev 4 section 5.6.1. 73 * For DSA it (and FIPS-186-4 section 4.2) specifies that the only size for 74 * which a 160bit hash is acceptable is 1kbit, and since ssh-dss specifies only 75 * SHA1 we limit the DSA key size 1k bits. 76 */ 77 #define DEFAULT_BITS 3072 78 #define DEFAULT_BITS_DSA 1024 79 #define DEFAULT_BITS_ECDSA 256 80 81 static int quiet = 0; 82 83 /* Flag indicating that we just want to see the key fingerprint */ 84 static int print_fingerprint = 0; 85 static int print_bubblebabble = 0; 86 87 /* Hash algorithm to use for fingerprints. */ 88 static int fingerprint_hash = SSH_FP_HASH_DEFAULT; 89 90 /* The identity file name, given on the command line or entered by the user. */ 91 static char identity_file[PATH_MAX]; 92 static int have_identity = 0; 93 94 /* This is set to the passphrase if given on the command line. */ 95 static char *identity_passphrase = NULL; 96 97 /* This is set to the new passphrase if given on the command line. */ 98 static char *identity_new_passphrase = NULL; 99 100 /* Key type when certifying */ 101 static u_int cert_key_type = SSH2_CERT_TYPE_USER; 102 103 /* "key ID" of signed key */ 104 static char *cert_key_id = NULL; 105 106 /* Comma-separated list of principal names for certifying keys */ 107 static char *cert_principals = NULL; 108 109 /* Validity period for certificates */ 110 static u_int64_t cert_valid_from = 0; 111 static u_int64_t cert_valid_to = ~0ULL; 112 113 /* Certificate options */ 114 #define CERTOPT_X_FWD (1) 115 #define CERTOPT_AGENT_FWD (1<<1) 116 #define CERTOPT_PORT_FWD (1<<2) 117 #define CERTOPT_PTY (1<<3) 118 #define CERTOPT_USER_RC (1<<4) 119 #define CERTOPT_NO_REQUIRE_USER_PRESENCE (1<<5) 120 #define CERTOPT_REQUIRE_VERIFY (1<<6) 121 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 122 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 123 static u_int32_t certflags_flags = CERTOPT_DEFAULT; 124 static char *certflags_command = NULL; 125 static char *certflags_src_addr = NULL; 126 127 /* Arbitrary extensions specified by user */ 128 struct cert_ext { 129 char *key; 130 char *val; 131 int crit; 132 }; 133 static struct cert_ext *cert_ext; 134 static size_t ncert_ext; 135 136 /* Conversion to/from various formats */ 137 enum { 138 FMT_RFC4716, 139 FMT_PKCS8, 140 FMT_PEM 141 } convert_format = FMT_RFC4716; 142 143 static char *key_type_name = NULL; 144 145 /* Load key from this PKCS#11 provider */ 146 static char *pkcs11provider = NULL; 147 148 /* FIDO/U2F provider to use */ 149 static char *sk_provider = NULL; 150 151 /* Format for writing private keys */ 152 static int private_key_format = SSHKEY_PRIVATE_OPENSSH; 153 154 /* Cipher for new-format private keys */ 155 static char *openssh_format_cipher = NULL; 156 157 /* Number of KDF rounds to derive new format keys. */ 158 static int rounds = 0; 159 160 /* argv0 */ 161 extern char *__progname; 162 163 static char hostname[NI_MAXHOST]; 164 165 #ifdef WITH_OPENSSL 166 /* moduli.c */ 167 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 168 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 169 unsigned long); 170 #endif 171 172 static void 173 type_bits_valid(int type, const char *name, u_int32_t *bitsp) 174 { 175 if (type == KEY_UNSPEC) 176 fatal("unknown key type %s", key_type_name); 177 if (*bitsp == 0) { 178 #ifdef WITH_OPENSSL 179 int nid; 180 181 switch(type) { 182 case KEY_DSA: 183 *bitsp = DEFAULT_BITS_DSA; 184 break; 185 case KEY_ECDSA: 186 if (name != NULL && 187 (nid = sshkey_ecdsa_nid_from_name(name)) > 0) 188 *bitsp = sshkey_curve_nid_to_bits(nid); 189 if (*bitsp == 0) 190 *bitsp = DEFAULT_BITS_ECDSA; 191 break; 192 case KEY_RSA: 193 *bitsp = DEFAULT_BITS; 194 break; 195 } 196 #endif 197 } 198 #ifdef WITH_OPENSSL 199 switch (type) { 200 case KEY_DSA: 201 if (*bitsp != 1024) 202 fatal("Invalid DSA key length: must be 1024 bits"); 203 break; 204 case KEY_RSA: 205 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE) 206 fatal("Invalid RSA key length: minimum is %d bits", 207 SSH_RSA_MINIMUM_MODULUS_SIZE); 208 else if (*bitsp > OPENSSL_RSA_MAX_MODULUS_BITS) 209 fatal("Invalid RSA key length: maximum is %d bits", 210 OPENSSL_RSA_MAX_MODULUS_BITS); 211 break; 212 case KEY_ECDSA: 213 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1) 214 fatal("Invalid ECDSA key length: valid lengths are " 215 "256, 384 or 521 bits"); 216 } 217 #endif 218 } 219 220 /* 221 * Checks whether a file exists and, if so, asks the user whether they wish 222 * to overwrite it. 223 * Returns nonzero if the file does not already exist or if the user agrees to 224 * overwrite, or zero otherwise. 225 */ 226 static int 227 confirm_overwrite(const char *filename) 228 { 229 char yesno[3]; 230 struct stat st; 231 232 if (stat(filename, &st) != 0) 233 return 1; 234 printf("%s already exists.\n", filename); 235 printf("Overwrite (y/n)? "); 236 fflush(stdout); 237 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 238 return 0; 239 if (yesno[0] != 'y' && yesno[0] != 'Y') 240 return 0; 241 return 1; 242 } 243 244 static void 245 ask_filename(struct passwd *pw, const char *prompt) 246 { 247 char buf[1024]; 248 char *name = NULL; 249 250 if (key_type_name == NULL) 251 name = _PATH_SSH_CLIENT_ID_ED25519; 252 else { 253 switch (sshkey_type_from_name(key_type_name)) { 254 #ifdef WITH_DSA 255 case KEY_DSA_CERT: 256 case KEY_DSA: 257 name = _PATH_SSH_CLIENT_ID_DSA; 258 break; 259 #endif 260 case KEY_ECDSA_CERT: 261 case KEY_ECDSA: 262 name = _PATH_SSH_CLIENT_ID_ECDSA; 263 break; 264 case KEY_ECDSA_SK_CERT: 265 case KEY_ECDSA_SK: 266 name = _PATH_SSH_CLIENT_ID_ECDSA_SK; 267 break; 268 case KEY_RSA_CERT: 269 case KEY_RSA: 270 name = _PATH_SSH_CLIENT_ID_RSA; 271 break; 272 case KEY_ED25519: 273 case KEY_ED25519_CERT: 274 name = _PATH_SSH_CLIENT_ID_ED25519; 275 break; 276 case KEY_ED25519_SK: 277 case KEY_ED25519_SK_CERT: 278 name = _PATH_SSH_CLIENT_ID_ED25519_SK; 279 break; 280 case KEY_XMSS: 281 case KEY_XMSS_CERT: 282 name = _PATH_SSH_CLIENT_ID_XMSS; 283 break; 284 default: 285 fatal("bad key type"); 286 } 287 } 288 snprintf(identity_file, sizeof(identity_file), 289 "%s/%s", pw->pw_dir, name); 290 printf("%s (%s): ", prompt, identity_file); 291 fflush(stdout); 292 if (fgets(buf, sizeof(buf), stdin) == NULL) 293 exit(1); 294 buf[strcspn(buf, "\n")] = '\0'; 295 if (strcmp(buf, "") != 0) 296 strlcpy(identity_file, buf, sizeof(identity_file)); 297 have_identity = 1; 298 } 299 300 static struct sshkey * 301 load_identity(const char *filename, char **commentp) 302 { 303 char *pass; 304 struct sshkey *prv; 305 int r; 306 307 if (commentp != NULL) 308 *commentp = NULL; 309 if ((r = sshkey_load_private(filename, "", &prv, commentp)) == 0) 310 return prv; 311 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 312 fatal_r(r, "Load key \"%s\"", filename); 313 if (identity_passphrase) 314 pass = xstrdup(identity_passphrase); 315 else 316 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN); 317 r = sshkey_load_private(filename, pass, &prv, commentp); 318 freezero(pass, strlen(pass)); 319 if (r != 0) 320 fatal_r(r, "Load key \"%s\"", filename); 321 return prv; 322 } 323 324 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 325 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 326 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 327 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 328 329 #ifdef WITH_OPENSSL 330 static void 331 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k) 332 { 333 struct sshbuf *b; 334 char comment[61], *b64; 335 int r; 336 337 if ((b = sshbuf_new()) == NULL) 338 fatal_f("sshbuf_new failed"); 339 if ((r = sshkey_putb(k, b)) != 0) 340 fatal_fr(r, "put key"); 341 if ((b64 = sshbuf_dtob64_string(b, 1)) == NULL) 342 fatal_f("sshbuf_dtob64_string failed"); 343 344 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 345 snprintf(comment, sizeof(comment), 346 "%u-bit %s, converted by %s@%s from OpenSSH", 347 sshkey_size(k), sshkey_type(k), 348 pw->pw_name, hostname); 349 350 sshkey_free(k); 351 sshbuf_free(b); 352 353 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 354 fprintf(stdout, "Comment: \"%s\"\n%s", comment, b64); 355 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 356 free(b64); 357 exit(0); 358 } 359 360 static void 361 do_convert_to_pkcs8(struct sshkey *k) 362 { 363 switch (sshkey_type_plain(k->type)) { 364 case KEY_RSA: 365 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 366 fatal("PEM_write_RSA_PUBKEY failed"); 367 break; 368 #ifdef WITH_DSA 369 case KEY_DSA: 370 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 371 fatal("PEM_write_DSA_PUBKEY failed"); 372 break; 373 #endif 374 case KEY_ECDSA: 375 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 376 fatal("PEM_write_EC_PUBKEY failed"); 377 break; 378 default: 379 fatal_f("unsupported key type %s", sshkey_type(k)); 380 } 381 exit(0); 382 } 383 384 static void 385 do_convert_to_pem(struct sshkey *k) 386 { 387 switch (sshkey_type_plain(k->type)) { 388 case KEY_RSA: 389 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 390 fatal("PEM_write_RSAPublicKey failed"); 391 break; 392 #ifdef WITH_DSA 393 case KEY_DSA: 394 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 395 fatal("PEM_write_DSA_PUBKEY failed"); 396 break; 397 #endif 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_f("unsupported key type %s", sshkey_type(k)); 404 } 405 exit(0); 406 } 407 408 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_f("unknown key format %d", 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_fr(r, "parse"); 449 bytes = (bignum_bits + 7) / 8; 450 if (sshbuf_len(b) < bytes) 451 fatal_f("input buffer too small: need %d have %zu", 452 bytes, sshbuf_len(b)); 453 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL) 454 fatal_f("BN_bin2bn failed"); 455 if ((r = sshbuf_consume(b, bytes)) != 0) 456 fatal_fr(r, "consume"); 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 const char *alg = NULL; 465 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345"; 466 int r, rlen, ktype; 467 u_int magic, i1, i2, i3, i4; 468 size_t slen; 469 u_long e; 470 #ifdef WITH_DSA 471 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL; 472 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL; 473 #endif 474 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL; 475 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL; 476 477 if ((r = sshbuf_get_u32(b, &magic)) != 0) 478 fatal_fr(r, "parse magic"); 479 480 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 481 error("bad magic 0x%x != 0x%x", magic, 482 SSH_COM_PRIVATE_KEY_MAGIC); 483 return NULL; 484 } 485 if ((r = sshbuf_get_u32(b, &i1)) != 0 || 486 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 487 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 || 488 (r = sshbuf_get_u32(b, &i2)) != 0 || 489 (r = sshbuf_get_u32(b, &i3)) != 0 || 490 (r = sshbuf_get_u32(b, &i4)) != 0) 491 fatal_fr(r, "parse"); 492 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 493 if (strcmp(cipher, "none") != 0) { 494 error("unsupported cipher %s", cipher); 495 free(cipher); 496 free(type); 497 return NULL; 498 } 499 free(cipher); 500 501 if (strstr(type, "rsa")) { 502 ktype = KEY_RSA; 503 #ifdef WITH_DSA 504 } else if (strstr(type, "dsa")) { 505 ktype = KEY_DSA; 506 #endif 507 } else { 508 free(type); 509 return NULL; 510 } 511 if ((key = sshkey_new(ktype)) == NULL) 512 fatal("sshkey_new failed"); 513 free(type); 514 515 switch (key->type) { 516 #ifdef WITH_DSA 517 case KEY_DSA: 518 if ((dsa_p = BN_new()) == NULL || 519 (dsa_q = BN_new()) == NULL || 520 (dsa_g = BN_new()) == NULL || 521 (dsa_pub_key = BN_new()) == NULL || 522 (dsa_priv_key = BN_new()) == NULL) 523 fatal_f("BN_new"); 524 buffer_get_bignum_bits(b, dsa_p); 525 buffer_get_bignum_bits(b, dsa_g); 526 buffer_get_bignum_bits(b, dsa_q); 527 buffer_get_bignum_bits(b, dsa_pub_key); 528 buffer_get_bignum_bits(b, dsa_priv_key); 529 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) 530 fatal_f("DSA_set0_pqg failed"); 531 dsa_p = dsa_q = dsa_g = NULL; /* transferred */ 532 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key)) 533 fatal_f("DSA_set0_key failed"); 534 dsa_pub_key = dsa_priv_key = NULL; /* transferred */ 535 break; 536 #endif 537 case KEY_RSA: 538 if ((r = sshbuf_get_u8(b, &e1)) != 0 || 539 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) || 540 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0)) 541 fatal_fr(r, "parse RSA"); 542 e = e1; 543 debug("e %lx", e); 544 if (e < 30) { 545 e <<= 8; 546 e += e2; 547 debug("e %lx", e); 548 e <<= 8; 549 e += e3; 550 debug("e %lx", e); 551 } 552 if ((rsa_e = BN_new()) == NULL) 553 fatal_f("BN_new"); 554 if (!BN_set_word(rsa_e, e)) { 555 BN_clear_free(rsa_e); 556 sshkey_free(key); 557 return NULL; 558 } 559 if ((rsa_n = BN_new()) == NULL || 560 (rsa_d = BN_new()) == NULL || 561 (rsa_p = BN_new()) == NULL || 562 (rsa_q = BN_new()) == NULL || 563 (rsa_iqmp = BN_new()) == NULL) 564 fatal_f("BN_new"); 565 buffer_get_bignum_bits(b, rsa_d); 566 buffer_get_bignum_bits(b, rsa_n); 567 buffer_get_bignum_bits(b, rsa_iqmp); 568 buffer_get_bignum_bits(b, rsa_q); 569 buffer_get_bignum_bits(b, rsa_p); 570 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d)) 571 fatal_f("RSA_set0_key failed"); 572 rsa_n = rsa_e = rsa_d = NULL; /* transferred */ 573 if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q)) 574 fatal_f("RSA_set0_factors failed"); 575 rsa_p = rsa_q = NULL; /* transferred */ 576 if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0) 577 fatal_fr(r, "generate RSA parameters"); 578 BN_clear_free(rsa_iqmp); 579 alg = "rsa-sha2-256"; 580 break; 581 } 582 rlen = sshbuf_len(b); 583 if (rlen != 0) 584 error_f("remaining bytes in key blob %d", rlen); 585 586 /* try the key */ 587 if ((r = sshkey_sign(key, &sig, &slen, data, sizeof(data), 588 alg, NULL, NULL, 0)) != 0) 589 error_fr(r, "signing with converted key failed"); 590 else if ((r = sshkey_verify(key, sig, slen, data, sizeof(data), 591 alg, 0, NULL)) != 0) 592 error_fr(r, "verification with converted key failed"); 593 if (r != 0) { 594 sshkey_free(key); 595 free(sig); 596 return NULL; 597 } 598 free(sig); 599 return key; 600 } 601 602 static int 603 get_line(FILE *fp, char *line, size_t len) 604 { 605 int c; 606 size_t pos = 0; 607 608 line[0] = '\0'; 609 while ((c = fgetc(fp)) != EOF) { 610 if (pos >= len - 1) 611 fatal("input line too long."); 612 switch (c) { 613 case '\r': 614 c = fgetc(fp); 615 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) 616 fatal("unget: %s", strerror(errno)); 617 return pos; 618 case '\n': 619 return pos; 620 } 621 line[pos++] = c; 622 line[pos] = '\0'; 623 } 624 /* We reached EOF */ 625 return -1; 626 } 627 628 static void 629 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private) 630 { 631 int r, blen, escaped = 0; 632 u_int len; 633 char line[1024]; 634 struct sshbuf *buf; 635 char encoded[8096]; 636 FILE *fp; 637 638 if ((buf = sshbuf_new()) == NULL) 639 fatal("sshbuf_new failed"); 640 if ((fp = fopen(identity_file, "r")) == NULL) 641 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 642 encoded[0] = '\0'; 643 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 644 if (blen > 0 && line[blen - 1] == '\\') 645 escaped++; 646 if (strncmp(line, "----", 4) == 0 || 647 strstr(line, ": ") != NULL) { 648 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 649 *private = 1; 650 if (strstr(line, " END ") != NULL) { 651 break; 652 } 653 /* fprintf(stderr, "ignore: %s", line); */ 654 continue; 655 } 656 if (escaped) { 657 escaped--; 658 /* fprintf(stderr, "escaped: %s", line); */ 659 continue; 660 } 661 strlcat(encoded, line, sizeof(encoded)); 662 } 663 len = strlen(encoded); 664 if (((len % 4) == 3) && 665 (encoded[len-1] == '=') && 666 (encoded[len-2] == '=') && 667 (encoded[len-3] == '=')) 668 encoded[len-3] = '\0'; 669 if ((r = sshbuf_b64tod(buf, encoded)) != 0) 670 fatal_fr(r, "base64 decode"); 671 if (*private) { 672 if ((*k = do_convert_private_ssh2(buf)) == NULL) 673 fatal_f("private key conversion failed"); 674 } else if ((r = sshkey_fromb(buf, k)) != 0) 675 fatal_fr(r, "parse key"); 676 sshbuf_free(buf); 677 fclose(fp); 678 } 679 680 static void 681 do_convert_from_pkcs8(struct sshkey **k, int *private) 682 { 683 EVP_PKEY *pubkey; 684 FILE *fp; 685 686 if ((fp = fopen(identity_file, "r")) == NULL) 687 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 688 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 689 fatal_f("%s is not a recognised public key format", 690 identity_file); 691 } 692 fclose(fp); 693 switch (EVP_PKEY_base_id(pubkey)) { 694 case EVP_PKEY_RSA: 695 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 696 fatal("sshkey_new failed"); 697 (*k)->type = KEY_RSA; 698 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 699 break; 700 #ifdef WITH_DSA 701 case EVP_PKEY_DSA: 702 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 703 fatal("sshkey_new failed"); 704 (*k)->type = KEY_DSA; 705 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 706 break; 707 #endif 708 case EVP_PKEY_EC: 709 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 710 fatal("sshkey_new failed"); 711 (*k)->type = KEY_ECDSA; 712 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 713 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa); 714 break; 715 default: 716 fatal_f("unsupported pubkey type %d", 717 EVP_PKEY_base_id(pubkey)); 718 } 719 EVP_PKEY_free(pubkey); 720 return; 721 } 722 723 static void 724 do_convert_from_pem(struct sshkey **k, int *private) 725 { 726 FILE *fp; 727 RSA *rsa; 728 729 if ((fp = fopen(identity_file, "r")) == NULL) 730 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 731 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 732 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 733 fatal("sshkey_new failed"); 734 (*k)->type = KEY_RSA; 735 (*k)->rsa = rsa; 736 fclose(fp); 737 return; 738 } 739 fatal_f("unrecognised raw private key format"); 740 } 741 742 static void 743 do_convert_from(struct passwd *pw) 744 { 745 struct sshkey *k = NULL; 746 int r, private = 0, ok = 0; 747 struct stat st; 748 749 if (!have_identity) 750 ask_filename(pw, "Enter file in which the key is"); 751 if (stat(identity_file, &st) == -1) 752 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 753 754 switch (convert_format) { 755 case FMT_RFC4716: 756 do_convert_from_ssh2(pw, &k, &private); 757 break; 758 case FMT_PKCS8: 759 do_convert_from_pkcs8(&k, &private); 760 break; 761 case FMT_PEM: 762 do_convert_from_pem(&k, &private); 763 break; 764 default: 765 fatal_f("unknown key format %d", convert_format); 766 } 767 768 if (!private) { 769 if ((r = sshkey_write(k, stdout)) == 0) 770 ok = 1; 771 if (ok) 772 fprintf(stdout, "\n"); 773 } else { 774 switch (k->type) { 775 #ifdef WITH_DSA 776 case KEY_DSA: 777 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 778 NULL, 0, NULL, NULL); 779 break; 780 #endif 781 case KEY_ECDSA: 782 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 783 NULL, 0, NULL, NULL); 784 break; 785 case KEY_RSA: 786 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 787 NULL, 0, NULL, NULL); 788 break; 789 default: 790 fatal_f("unsupported key type %s", sshkey_type(k)); 791 } 792 } 793 794 if (!ok) 795 fatal("key write failed"); 796 sshkey_free(k); 797 exit(0); 798 } 799 #endif 800 801 static void 802 do_print_public(struct passwd *pw) 803 { 804 struct sshkey *prv; 805 struct stat st; 806 int r; 807 char *comment = NULL; 808 809 if (!have_identity) 810 ask_filename(pw, "Enter file in which the key is"); 811 if (stat(identity_file, &st) == -1) 812 fatal("%s: %s", identity_file, strerror(errno)); 813 prv = load_identity(identity_file, &comment); 814 if ((r = sshkey_write(prv, stdout)) != 0) 815 fatal_fr(r, "write key"); 816 if (comment != NULL && *comment != '\0') 817 fprintf(stdout, " %s", comment); 818 fprintf(stdout, "\n"); 819 if (sshkey_is_sk(prv)) { 820 debug("sk_application: \"%s\", sk_flags 0x%02x", 821 prv->sk_application, prv->sk_flags); 822 } 823 sshkey_free(prv); 824 free(comment); 825 exit(0); 826 } 827 828 static void 829 do_download(struct passwd *pw) 830 { 831 #ifdef ENABLE_PKCS11 832 struct sshkey **keys = NULL; 833 int i, nkeys; 834 enum sshkey_fp_rep rep; 835 int fptype; 836 char *fp, *ra, **comments = NULL; 837 838 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 839 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 840 841 pkcs11_init(1); 842 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys, &comments); 843 if (nkeys <= 0) 844 fatal("cannot read public key from pkcs11"); 845 for (i = 0; i < nkeys; i++) { 846 if (print_fingerprint) { 847 fp = sshkey_fingerprint(keys[i], fptype, rep); 848 ra = sshkey_fingerprint(keys[i], fingerprint_hash, 849 SSH_FP_RANDOMART); 850 if (fp == NULL || ra == NULL) 851 fatal_f("sshkey_fingerprint fail"); 852 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]), 853 fp, sshkey_type(keys[i])); 854 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 855 printf("%s\n", ra); 856 free(ra); 857 free(fp); 858 } else { 859 (void) sshkey_write(keys[i], stdout); /* XXX check */ 860 fprintf(stdout, "%s%s\n", 861 *(comments[i]) == '\0' ? "" : " ", comments[i]); 862 } 863 free(comments[i]); 864 sshkey_free(keys[i]); 865 } 866 free(comments); 867 free(keys); 868 pkcs11_terminate(); 869 exit(0); 870 #else 871 fatal("no pkcs11 support"); 872 #endif /* ENABLE_PKCS11 */ 873 } 874 875 static struct sshkey * 876 try_read_key(char **cpp) 877 { 878 struct sshkey *ret; 879 int r; 880 881 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL) 882 fatal("sshkey_new failed"); 883 if ((r = sshkey_read(ret, cpp)) == 0) 884 return ret; 885 /* Not a key */ 886 sshkey_free(ret); 887 return NULL; 888 } 889 890 static void 891 fingerprint_one_key(const struct sshkey *public, const char *comment) 892 { 893 char *fp = NULL, *ra = NULL; 894 enum sshkey_fp_rep rep; 895 int fptype; 896 897 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 898 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 899 fp = sshkey_fingerprint(public, fptype, rep); 900 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART); 901 if (fp == NULL || ra == NULL) 902 fatal_f("sshkey_fingerprint failed"); 903 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp, 904 comment ? comment : "no comment", sshkey_type(public)); 905 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 906 printf("%s\n", ra); 907 free(ra); 908 free(fp); 909 } 910 911 static void 912 fingerprint_private(const char *path) 913 { 914 struct stat st; 915 char *comment = NULL; 916 struct sshkey *privkey = NULL, *pubkey = NULL; 917 int r; 918 919 if (stat(identity_file, &st) == -1) 920 fatal("%s: %s", path, strerror(errno)); 921 if ((r = sshkey_load_public(path, &pubkey, &comment)) != 0) 922 debug_r(r, "load public \"%s\"", path); 923 if (pubkey == NULL || comment == NULL || *comment == '\0') { 924 free(comment); 925 if ((r = sshkey_load_private(path, NULL, 926 &privkey, &comment)) != 0) 927 debug_r(r, "load private \"%s\"", path); 928 } 929 if (pubkey == NULL && privkey == NULL) 930 fatal("%s is not a key file.", path); 931 932 fingerprint_one_key(pubkey == NULL ? privkey : pubkey, comment); 933 sshkey_free(pubkey); 934 sshkey_free(privkey); 935 free(comment); 936 } 937 938 static void 939 do_fingerprint(struct passwd *pw) 940 { 941 FILE *f; 942 struct sshkey *public = NULL; 943 char *comment = NULL, *cp, *ep, *line = NULL; 944 size_t linesize = 0; 945 int i, invalid = 1; 946 const char *path; 947 u_long lnum = 0; 948 949 if (!have_identity) 950 ask_filename(pw, "Enter file in which the key is"); 951 path = identity_file; 952 953 if (strcmp(identity_file, "-") == 0) { 954 f = stdin; 955 path = "(stdin)"; 956 } else if ((f = fopen(path, "r")) == NULL) 957 fatal("%s: %s: %s", __progname, path, strerror(errno)); 958 959 while (getline(&line, &linesize, f) != -1) { 960 lnum++; 961 cp = line; 962 cp[strcspn(cp, "\n")] = '\0'; 963 /* Trim leading space and comments */ 964 cp = line + strspn(line, " \t"); 965 if (*cp == '#' || *cp == '\0') 966 continue; 967 968 /* 969 * Input may be plain keys, private keys, authorized_keys 970 * or known_hosts. 971 */ 972 973 /* 974 * Try private keys first. Assume a key is private if 975 * "SSH PRIVATE KEY" appears on the first line and we're 976 * not reading from stdin (XXX support private keys on stdin). 977 */ 978 if (lnum == 1 && strcmp(identity_file, "-") != 0 && 979 strstr(cp, "PRIVATE KEY") != NULL) { 980 free(line); 981 fclose(f); 982 fingerprint_private(path); 983 exit(0); 984 } 985 986 /* 987 * If it's not a private key, then this must be prepared to 988 * accept a public key prefixed with a hostname or options. 989 * Try a bare key first, otherwise skip the leading stuff. 990 */ 991 comment = NULL; 992 if ((public = try_read_key(&cp)) == NULL) { 993 i = strtol(cp, &ep, 10); 994 if (i == 0 || ep == NULL || 995 (*ep != ' ' && *ep != '\t')) { 996 int quoted = 0; 997 998 comment = cp; 999 for (; *cp && (quoted || (*cp != ' ' && 1000 *cp != '\t')); cp++) { 1001 if (*cp == '\\' && cp[1] == '"') 1002 cp++; /* Skip both */ 1003 else if (*cp == '"') 1004 quoted = !quoted; 1005 } 1006 if (!*cp) 1007 continue; 1008 *cp++ = '\0'; 1009 } 1010 } 1011 /* Retry after parsing leading hostname/key options */ 1012 if (public == NULL && (public = try_read_key(&cp)) == NULL) { 1013 debug("%s:%lu: not a public key", path, lnum); 1014 continue; 1015 } 1016 1017 /* Find trailing comment, if any */ 1018 for (; *cp == ' ' || *cp == '\t'; cp++) 1019 ; 1020 if (*cp != '\0' && *cp != '#') 1021 comment = cp; 1022 1023 fingerprint_one_key(public, comment); 1024 sshkey_free(public); 1025 invalid = 0; /* One good key in the file is sufficient */ 1026 } 1027 fclose(f); 1028 free(line); 1029 1030 if (invalid) 1031 fatal("%s is not a public key file.", path); 1032 exit(0); 1033 } 1034 1035 static void 1036 do_gen_all_hostkeys(struct passwd *pw) 1037 { 1038 struct { 1039 char *key_type; 1040 char *key_type_display; 1041 char *path; 1042 } key_types[] = { 1043 #ifdef WITH_OPENSSL 1044 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 1045 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 1046 #endif /* WITH_OPENSSL */ 1047 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE }, 1048 #ifdef WITH_XMSS 1049 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE }, 1050 #endif /* WITH_XMSS */ 1051 { NULL, NULL, NULL } 1052 }; 1053 1054 u_int32_t bits = 0; 1055 int first = 0; 1056 struct stat st; 1057 struct sshkey *private, *public; 1058 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file; 1059 int i, type, fd, r; 1060 1061 for (i = 0; key_types[i].key_type; i++) { 1062 public = private = NULL; 1063 prv_tmp = pub_tmp = prv_file = pub_file = NULL; 1064 1065 xasprintf(&prv_file, "%s%s", 1066 identity_file, key_types[i].path); 1067 1068 /* Check whether private key exists and is not zero-length */ 1069 if (stat(prv_file, &st) == 0) { 1070 if (st.st_size != 0) 1071 goto next; 1072 } else if (errno != ENOENT) { 1073 error("Could not stat %s: %s", key_types[i].path, 1074 strerror(errno)); 1075 goto failnext; 1076 } 1077 1078 /* 1079 * Private key doesn't exist or is invalid; proceed with 1080 * key generation. 1081 */ 1082 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX", 1083 identity_file, key_types[i].path); 1084 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX", 1085 identity_file, key_types[i].path); 1086 xasprintf(&pub_file, "%s%s.pub", 1087 identity_file, key_types[i].path); 1088 1089 if (first == 0) { 1090 first = 1; 1091 printf("%s: generating new host keys: ", __progname); 1092 } 1093 printf("%s ", key_types[i].key_type_display); 1094 fflush(stdout); 1095 type = sshkey_type_from_name(key_types[i].key_type); 1096 if ((fd = mkstemp(prv_tmp)) == -1) { 1097 error("Could not save your private key in %s: %s", 1098 prv_tmp, strerror(errno)); 1099 goto failnext; 1100 } 1101 (void)close(fd); /* just using mkstemp() to reserve a name */ 1102 bits = 0; 1103 type_bits_valid(type, NULL, &bits); 1104 if ((r = sshkey_generate(type, bits, &private)) != 0) { 1105 error_r(r, "sshkey_generate failed"); 1106 goto failnext; 1107 } 1108 if ((r = sshkey_from_private(private, &public)) != 0) 1109 fatal_fr(r, "sshkey_from_private"); 1110 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 1111 hostname); 1112 if ((r = sshkey_save_private(private, prv_tmp, "", 1113 comment, private_key_format, openssh_format_cipher, 1114 rounds)) != 0) { 1115 error_r(r, "Saving key \"%s\" failed", prv_tmp); 1116 goto failnext; 1117 } 1118 if ((fd = mkstemp(pub_tmp)) == -1) { 1119 error("Could not save your public key in %s: %s", 1120 pub_tmp, strerror(errno)); 1121 goto failnext; 1122 } 1123 (void)fchmod(fd, 0644); 1124 (void)close(fd); 1125 if ((r = sshkey_save_public(public, pub_tmp, comment)) != 0) { 1126 error_r(r, "Unable to save public key to %s", 1127 identity_file); 1128 goto failnext; 1129 } 1130 1131 /* Rename temporary files to their permanent locations. */ 1132 if (rename(pub_tmp, pub_file) != 0) { 1133 error("Unable to move %s into position: %s", 1134 pub_file, strerror(errno)); 1135 goto failnext; 1136 } 1137 if (rename(prv_tmp, prv_file) != 0) { 1138 error("Unable to move %s into position: %s", 1139 key_types[i].path, strerror(errno)); 1140 failnext: 1141 first = 0; 1142 goto next; 1143 } 1144 next: 1145 sshkey_free(private); 1146 sshkey_free(public); 1147 free(prv_tmp); 1148 free(pub_tmp); 1149 free(prv_file); 1150 free(pub_file); 1151 } 1152 if (first != 0) 1153 printf("\n"); 1154 } 1155 1156 struct known_hosts_ctx { 1157 const char *host; /* Hostname searched for in find/delete case */ 1158 FILE *out; /* Output file, stdout for find_hosts case */ 1159 int has_unhashed; /* When hashing, original had unhashed hosts */ 1160 int found_key; /* For find/delete, host was found */ 1161 int invalid; /* File contained invalid items; don't delete */ 1162 int hash_hosts; /* Hash hostnames as we go */ 1163 int find_host; /* Search for specific hostname */ 1164 int delete_host; /* Delete host from known_hosts */ 1165 }; 1166 1167 static int 1168 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx) 1169 { 1170 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1171 char *hashed, *cp, *hosts, *ohosts; 1172 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts); 1173 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM; 1174 1175 switch (l->status) { 1176 case HKF_STATUS_OK: 1177 case HKF_STATUS_MATCHED: 1178 /* 1179 * Don't hash hosts already hashed, with wildcard 1180 * characters or a CA/revocation marker. 1181 */ 1182 if (was_hashed || has_wild || l->marker != MRK_NONE) { 1183 fprintf(ctx->out, "%s\n", l->line); 1184 if (has_wild && !ctx->find_host) { 1185 logit("%s:%lu: ignoring host name " 1186 "with wildcard: %.64s", l->path, 1187 l->linenum, l->hosts); 1188 } 1189 return 0; 1190 } 1191 /* 1192 * Split any comma-separated hostnames from the host list, 1193 * hash and store separately. 1194 */ 1195 ohosts = hosts = xstrdup(l->hosts); 1196 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') { 1197 lowercase(cp); 1198 if ((hashed = host_hash(cp, NULL, 0)) == NULL) 1199 fatal("hash_host failed"); 1200 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey); 1201 free(hashed); 1202 ctx->has_unhashed = 1; 1203 } 1204 free(ohosts); 1205 return 0; 1206 case HKF_STATUS_INVALID: 1207 /* Retain invalid lines, but mark file as invalid. */ 1208 ctx->invalid = 1; 1209 logit("%s:%lu: invalid line", l->path, l->linenum); 1210 /* FALLTHROUGH */ 1211 default: 1212 fprintf(ctx->out, "%s\n", l->line); 1213 return 0; 1214 } 1215 /* NOTREACHED */ 1216 return -1; 1217 } 1218 1219 static int 1220 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx) 1221 { 1222 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1223 enum sshkey_fp_rep rep; 1224 int fptype; 1225 char *fp = NULL, *ra = NULL; 1226 1227 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 1228 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 1229 1230 if (l->status == HKF_STATUS_MATCHED) { 1231 if (ctx->delete_host) { 1232 if (l->marker != MRK_NONE) { 1233 /* Don't remove CA and revocation lines */ 1234 fprintf(ctx->out, "%s\n", l->line); 1235 } else { 1236 /* 1237 * Hostname matches and has no CA/revoke 1238 * marker, delete it by *not* writing the 1239 * line to ctx->out. 1240 */ 1241 ctx->found_key = 1; 1242 if (!quiet) 1243 printf("# Host %s found: line %lu\n", 1244 ctx->host, l->linenum); 1245 } 1246 return 0; 1247 } else if (ctx->find_host) { 1248 ctx->found_key = 1; 1249 if (!quiet) { 1250 printf("# Host %s found: line %lu %s\n", 1251 ctx->host, 1252 l->linenum, l->marker == MRK_CA ? "CA" : 1253 (l->marker == MRK_REVOKE ? "REVOKED" : "")); 1254 } 1255 if (ctx->hash_hosts) 1256 known_hosts_hash(l, ctx); 1257 else if (print_fingerprint) { 1258 fp = sshkey_fingerprint(l->key, fptype, rep); 1259 ra = sshkey_fingerprint(l->key, 1260 fingerprint_hash, SSH_FP_RANDOMART); 1261 if (fp == NULL || ra == NULL) 1262 fatal_f("sshkey_fingerprint failed"); 1263 mprintf("%s %s %s%s%s\n", ctx->host, 1264 sshkey_type(l->key), fp, 1265 l->comment[0] ? " " : "", 1266 l->comment); 1267 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 1268 printf("%s\n", ra); 1269 free(ra); 1270 free(fp); 1271 } else 1272 fprintf(ctx->out, "%s\n", l->line); 1273 return 0; 1274 } 1275 } else if (ctx->delete_host) { 1276 /* Retain non-matching hosts when deleting */ 1277 if (l->status == HKF_STATUS_INVALID) { 1278 ctx->invalid = 1; 1279 logit("%s:%lu: invalid line", l->path, l->linenum); 1280 } 1281 fprintf(ctx->out, "%s\n", l->line); 1282 } 1283 return 0; 1284 } 1285 1286 static void 1287 do_known_hosts(struct passwd *pw, const char *name, int find_host, 1288 int delete_host, int hash_hosts) 1289 { 1290 char *cp, tmp[PATH_MAX], old[PATH_MAX]; 1291 int r, fd, oerrno, inplace = 0; 1292 struct known_hosts_ctx ctx; 1293 u_int foreach_options; 1294 struct stat sb; 1295 1296 if (!have_identity) { 1297 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1298 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1299 sizeof(identity_file)) 1300 fatal("Specified known hosts path too long"); 1301 free(cp); 1302 have_identity = 1; 1303 } 1304 if (stat(identity_file, &sb) != 0) 1305 fatal("Cannot stat %s: %s", identity_file, strerror(errno)); 1306 1307 memset(&ctx, 0, sizeof(ctx)); 1308 ctx.out = stdout; 1309 ctx.host = name; 1310 ctx.hash_hosts = hash_hosts; 1311 ctx.find_host = find_host; 1312 ctx.delete_host = delete_host; 1313 1314 /* 1315 * Find hosts goes to stdout, hash and deletions happen in-place 1316 * A corner case is ssh-keygen -HF foo, which should go to stdout 1317 */ 1318 if (!find_host && (hash_hosts || delete_host)) { 1319 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1320 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1321 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1322 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1323 fatal("known_hosts path too long"); 1324 umask(077); 1325 if ((fd = mkstemp(tmp)) == -1) 1326 fatal("mkstemp: %s", strerror(errno)); 1327 if ((ctx.out = fdopen(fd, "w")) == NULL) { 1328 oerrno = errno; 1329 unlink(tmp); 1330 fatal("fdopen: %s", strerror(oerrno)); 1331 } 1332 (void)fchmod(fd, sb.st_mode & 0644); 1333 inplace = 1; 1334 } 1335 /* XXX support identity_file == "-" for stdin */ 1336 foreach_options = find_host ? HKF_WANT_MATCH : 0; 1337 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0; 1338 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ? 1339 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL, 1340 foreach_options, 0)) != 0) { 1341 if (inplace) 1342 unlink(tmp); 1343 fatal_fr(r, "hostkeys_foreach"); 1344 } 1345 1346 if (inplace) 1347 fclose(ctx.out); 1348 1349 if (ctx.invalid) { 1350 error("%s is not a valid known_hosts file.", identity_file); 1351 if (inplace) { 1352 error("Not replacing existing known_hosts " 1353 "file because of errors"); 1354 unlink(tmp); 1355 } 1356 exit(1); 1357 } else if (delete_host && !ctx.found_key) { 1358 logit("Host %s not found in %s", name, identity_file); 1359 if (inplace) 1360 unlink(tmp); 1361 } else if (inplace) { 1362 /* Backup existing file */ 1363 if (unlink(old) == -1 && errno != ENOENT) 1364 fatal("unlink %.100s: %s", old, strerror(errno)); 1365 if (link(identity_file, old) == -1) 1366 fatal("link %.100s to %.100s: %s", identity_file, old, 1367 strerror(errno)); 1368 /* Move new one into place */ 1369 if (rename(tmp, identity_file) == -1) { 1370 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1371 strerror(errno)); 1372 unlink(tmp); 1373 unlink(old); 1374 exit(1); 1375 } 1376 1377 printf("%s updated.\n", identity_file); 1378 printf("Original contents retained as %s\n", old); 1379 if (ctx.has_unhashed) { 1380 logit("WARNING: %s contains unhashed entries", old); 1381 logit("Delete this file to ensure privacy " 1382 "of hostnames"); 1383 } 1384 } 1385 1386 exit (find_host && !ctx.found_key); 1387 } 1388 1389 /* 1390 * Perform changing a passphrase. The argument is the passwd structure 1391 * for the current user. 1392 */ 1393 static void 1394 do_change_passphrase(struct passwd *pw) 1395 { 1396 char *comment; 1397 char *old_passphrase, *passphrase1, *passphrase2; 1398 struct stat st; 1399 struct sshkey *private; 1400 int r; 1401 1402 if (!have_identity) 1403 ask_filename(pw, "Enter file in which the key is"); 1404 if (stat(identity_file, &st) == -1) 1405 fatal("%s: %s", identity_file, strerror(errno)); 1406 /* Try to load the file with empty passphrase. */ 1407 r = sshkey_load_private(identity_file, "", &private, &comment); 1408 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) { 1409 if (identity_passphrase) 1410 old_passphrase = xstrdup(identity_passphrase); 1411 else 1412 old_passphrase = 1413 read_passphrase("Enter old passphrase: ", 1414 RP_ALLOW_STDIN); 1415 r = sshkey_load_private(identity_file, old_passphrase, 1416 &private, &comment); 1417 freezero(old_passphrase, strlen(old_passphrase)); 1418 if (r != 0) 1419 goto badkey; 1420 } else if (r != 0) { 1421 badkey: 1422 fatal_r(r, "Failed to load key %s", identity_file); 1423 } 1424 if (comment) 1425 mprintf("Key has comment '%s'\n", comment); 1426 1427 /* Ask the new passphrase (twice). */ 1428 if (identity_new_passphrase) { 1429 passphrase1 = xstrdup(identity_new_passphrase); 1430 passphrase2 = NULL; 1431 } else { 1432 passphrase1 = 1433 read_passphrase("Enter new passphrase (empty for no " 1434 "passphrase): ", RP_ALLOW_STDIN); 1435 passphrase2 = read_passphrase("Enter same passphrase again: ", 1436 RP_ALLOW_STDIN); 1437 1438 /* Verify that they are the same. */ 1439 if (strcmp(passphrase1, passphrase2) != 0) { 1440 explicit_bzero(passphrase1, strlen(passphrase1)); 1441 explicit_bzero(passphrase2, strlen(passphrase2)); 1442 free(passphrase1); 1443 free(passphrase2); 1444 printf("Pass phrases do not match. Try again.\n"); 1445 exit(1); 1446 } 1447 /* Destroy the other copy. */ 1448 freezero(passphrase2, strlen(passphrase2)); 1449 } 1450 1451 /* Save the file using the new passphrase. */ 1452 if ((r = sshkey_save_private(private, identity_file, passphrase1, 1453 comment, private_key_format, openssh_format_cipher, rounds)) != 0) { 1454 error_r(r, "Saving key \"%s\" failed", identity_file); 1455 freezero(passphrase1, strlen(passphrase1)); 1456 sshkey_free(private); 1457 free(comment); 1458 exit(1); 1459 } 1460 /* Destroy the passphrase and the copy of the key in memory. */ 1461 freezero(passphrase1, strlen(passphrase1)); 1462 sshkey_free(private); /* Destroys contents */ 1463 free(comment); 1464 1465 printf("Your identification has been saved with the new passphrase.\n"); 1466 exit(0); 1467 } 1468 1469 /* 1470 * Print the SSHFP RR. 1471 */ 1472 static int 1473 do_print_resource_record(struct passwd *pw, char *fname, char *hname, 1474 int print_generic, char * const *opts, size_t nopts) 1475 { 1476 struct sshkey *public; 1477 char *comment = NULL; 1478 struct stat st; 1479 int r, hash = -1; 1480 size_t i; 1481 1482 for (i = 0; i < nopts; i++) { 1483 if (strncasecmp(opts[i], "hashalg=", 8) == 0) { 1484 if ((hash = ssh_digest_alg_by_name(opts[i] + 8)) == -1) 1485 fatal("Unsupported hash algorithm"); 1486 } else { 1487 error("Invalid option \"%s\"", opts[i]); 1488 return SSH_ERR_INVALID_ARGUMENT; 1489 } 1490 } 1491 if (fname == NULL) 1492 fatal_f("no filename"); 1493 if (stat(fname, &st) == -1) { 1494 if (errno == ENOENT) 1495 return 0; 1496 fatal("%s: %s", fname, strerror(errno)); 1497 } 1498 if ((r = sshkey_load_public(fname, &public, &comment)) != 0) 1499 fatal_r(r, "Failed to read v2 public key from \"%s\"", fname); 1500 export_dns_rr(hname, public, stdout, print_generic, hash); 1501 sshkey_free(public); 1502 free(comment); 1503 return 1; 1504 } 1505 1506 /* 1507 * Change the comment of a private key file. 1508 */ 1509 static void 1510 do_change_comment(struct passwd *pw, const char *identity_comment) 1511 { 1512 char new_comment[1024], *comment, *passphrase; 1513 struct sshkey *private; 1514 struct sshkey *public; 1515 struct stat st; 1516 int r; 1517 1518 if (!have_identity) 1519 ask_filename(pw, "Enter file in which the key is"); 1520 if (stat(identity_file, &st) == -1) 1521 fatal("%s: %s", identity_file, strerror(errno)); 1522 if ((r = sshkey_load_private(identity_file, "", 1523 &private, &comment)) == 0) 1524 passphrase = xstrdup(""); 1525 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 1526 fatal_r(r, "Cannot load private key \"%s\"", identity_file); 1527 else { 1528 if (identity_passphrase) 1529 passphrase = xstrdup(identity_passphrase); 1530 else if (identity_new_passphrase) 1531 passphrase = xstrdup(identity_new_passphrase); 1532 else 1533 passphrase = read_passphrase("Enter passphrase: ", 1534 RP_ALLOW_STDIN); 1535 /* Try to load using the passphrase. */ 1536 if ((r = sshkey_load_private(identity_file, passphrase, 1537 &private, &comment)) != 0) { 1538 freezero(passphrase, strlen(passphrase)); 1539 fatal_r(r, "Cannot load private key \"%s\"", 1540 identity_file); 1541 } 1542 } 1543 1544 if (private->type != KEY_ED25519 && private->type != KEY_XMSS && 1545 private_key_format != SSHKEY_PRIVATE_OPENSSH) { 1546 error("Comments are only supported for keys stored in " 1547 "the new format (-o)."); 1548 explicit_bzero(passphrase, strlen(passphrase)); 1549 sshkey_free(private); 1550 exit(1); 1551 } 1552 if (comment) 1553 printf("Old comment: %s\n", comment); 1554 else 1555 printf("No existing comment\n"); 1556 1557 if (identity_comment) { 1558 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1559 } else { 1560 printf("New comment: "); 1561 fflush(stdout); 1562 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1563 explicit_bzero(passphrase, strlen(passphrase)); 1564 sshkey_free(private); 1565 exit(1); 1566 } 1567 new_comment[strcspn(new_comment, "\n")] = '\0'; 1568 } 1569 if (comment != NULL && strcmp(comment, new_comment) == 0) { 1570 printf("No change to comment\n"); 1571 free(passphrase); 1572 sshkey_free(private); 1573 free(comment); 1574 exit(0); 1575 } 1576 1577 /* Save the file using the new passphrase. */ 1578 if ((r = sshkey_save_private(private, identity_file, passphrase, 1579 new_comment, private_key_format, openssh_format_cipher, 1580 rounds)) != 0) { 1581 error_r(r, "Saving key \"%s\" failed", identity_file); 1582 freezero(passphrase, strlen(passphrase)); 1583 sshkey_free(private); 1584 free(comment); 1585 exit(1); 1586 } 1587 freezero(passphrase, strlen(passphrase)); 1588 if ((r = sshkey_from_private(private, &public)) != 0) 1589 fatal_fr(r, "sshkey_from_private"); 1590 sshkey_free(private); 1591 1592 strlcat(identity_file, ".pub", sizeof(identity_file)); 1593 if ((r = sshkey_save_public(public, identity_file, new_comment)) != 0) 1594 fatal_r(r, "Unable to save public key to %s", identity_file); 1595 sshkey_free(public); 1596 free(comment); 1597 1598 if (strlen(new_comment) > 0) 1599 printf("Comment '%s' applied\n", new_comment); 1600 else 1601 printf("Comment removed\n"); 1602 1603 exit(0); 1604 } 1605 1606 static void 1607 cert_ext_add(const char *key, const char *value, int iscrit) 1608 { 1609 cert_ext = xreallocarray(cert_ext, ncert_ext + 1, sizeof(*cert_ext)); 1610 cert_ext[ncert_ext].key = xstrdup(key); 1611 cert_ext[ncert_ext].val = value == NULL ? NULL : xstrdup(value); 1612 cert_ext[ncert_ext].crit = iscrit; 1613 ncert_ext++; 1614 } 1615 1616 /* qsort(3) comparison function for certificate extensions */ 1617 static int 1618 cert_ext_cmp(const void *_a, const void *_b) 1619 { 1620 const struct cert_ext *a = (const struct cert_ext *)_a; 1621 const struct cert_ext *b = (const struct cert_ext *)_b; 1622 int r; 1623 1624 if (a->crit != b->crit) 1625 return (a->crit < b->crit) ? -1 : 1; 1626 if ((r = strcmp(a->key, b->key)) != 0) 1627 return r; 1628 if ((a->val == NULL) != (b->val == NULL)) 1629 return (a->val == NULL) ? -1 : 1; 1630 if (a->val != NULL && (r = strcmp(a->val, b->val)) != 0) 1631 return r; 1632 return 0; 1633 } 1634 1635 #define OPTIONS_CRITICAL 1 1636 #define OPTIONS_EXTENSIONS 2 1637 static void 1638 prepare_options_buf(struct sshbuf *c, int which) 1639 { 1640 struct sshbuf *b; 1641 size_t i; 1642 int r; 1643 const struct cert_ext *ext; 1644 1645 if ((b = sshbuf_new()) == NULL) 1646 fatal_f("sshbuf_new failed"); 1647 sshbuf_reset(c); 1648 for (i = 0; i < ncert_ext; i++) { 1649 ext = &cert_ext[i]; 1650 if ((ext->crit && (which & OPTIONS_EXTENSIONS)) || 1651 (!ext->crit && (which & OPTIONS_CRITICAL))) 1652 continue; 1653 if (ext->val == NULL) { 1654 /* flag option */ 1655 debug3_f("%s", ext->key); 1656 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 || 1657 (r = sshbuf_put_string(c, NULL, 0)) != 0) 1658 fatal_fr(r, "prepare flag"); 1659 } else { 1660 /* key/value option */ 1661 debug3_f("%s=%s", ext->key, ext->val); 1662 sshbuf_reset(b); 1663 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 || 1664 (r = sshbuf_put_cstring(b, ext->val)) != 0 || 1665 (r = sshbuf_put_stringb(c, b)) != 0) 1666 fatal_fr(r, "prepare k/v"); 1667 } 1668 } 1669 sshbuf_free(b); 1670 } 1671 1672 static void 1673 finalise_cert_exts(void) 1674 { 1675 /* critical options */ 1676 if (certflags_command != NULL) 1677 cert_ext_add("force-command", certflags_command, 1); 1678 if (certflags_src_addr != NULL) 1679 cert_ext_add("source-address", certflags_src_addr, 1); 1680 if ((certflags_flags & CERTOPT_REQUIRE_VERIFY) != 0) 1681 cert_ext_add("verify-required", NULL, 1); 1682 /* extensions */ 1683 if ((certflags_flags & CERTOPT_X_FWD) != 0) 1684 cert_ext_add("permit-X11-forwarding", NULL, 0); 1685 if ((certflags_flags & CERTOPT_AGENT_FWD) != 0) 1686 cert_ext_add("permit-agent-forwarding", NULL, 0); 1687 if ((certflags_flags & CERTOPT_PORT_FWD) != 0) 1688 cert_ext_add("permit-port-forwarding", NULL, 0); 1689 if ((certflags_flags & CERTOPT_PTY) != 0) 1690 cert_ext_add("permit-pty", NULL, 0); 1691 if ((certflags_flags & CERTOPT_USER_RC) != 0) 1692 cert_ext_add("permit-user-rc", NULL, 0); 1693 if ((certflags_flags & CERTOPT_NO_REQUIRE_USER_PRESENCE) != 0) 1694 cert_ext_add("no-touch-required", NULL, 0); 1695 /* order lexically by key */ 1696 if (ncert_ext > 0) 1697 qsort(cert_ext, ncert_ext, sizeof(*cert_ext), cert_ext_cmp); 1698 } 1699 1700 static struct sshkey * 1701 load_pkcs11_key(char *path) 1702 { 1703 #ifdef ENABLE_PKCS11 1704 struct sshkey **keys = NULL, *public, *private = NULL; 1705 int r, i, nkeys; 1706 1707 if ((r = sshkey_load_public(path, &public, NULL)) != 0) 1708 fatal_r(r, "Couldn't load CA public key \"%s\"", path); 1709 1710 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, 1711 &keys, NULL); 1712 debug3_f("%d keys", nkeys); 1713 if (nkeys <= 0) 1714 fatal("cannot read public key from pkcs11"); 1715 for (i = 0; i < nkeys; i++) { 1716 if (sshkey_equal_public(public, keys[i])) { 1717 private = keys[i]; 1718 continue; 1719 } 1720 sshkey_free(keys[i]); 1721 } 1722 free(keys); 1723 sshkey_free(public); 1724 return private; 1725 #else 1726 fatal("no pkcs11 support"); 1727 #endif /* ENABLE_PKCS11 */ 1728 } 1729 1730 /* Signer for sshkey_certify_custom that uses the agent */ 1731 static int 1732 agent_signer(struct sshkey *key, u_char **sigp, size_t *lenp, 1733 const u_char *data, size_t datalen, 1734 const char *alg, const char *provider, const char *pin, 1735 u_int compat, void *ctx) 1736 { 1737 int *agent_fdp = (int *)ctx; 1738 1739 return ssh_agent_sign(*agent_fdp, key, sigp, lenp, 1740 data, datalen, alg, compat); 1741 } 1742 1743 static void 1744 do_ca_sign(struct passwd *pw, const char *ca_key_path, int prefer_agent, 1745 unsigned long long cert_serial, int cert_serial_autoinc, 1746 int argc, char **argv) 1747 { 1748 int r, i, found, agent_fd = -1; 1749 u_int n; 1750 struct sshkey *ca, *public; 1751 char valid[64], *otmp, *tmp, *cp, *out, *comment; 1752 char *ca_fp = NULL, **plist = NULL, *pin = NULL; 1753 struct ssh_identitylist *agent_ids; 1754 size_t j; 1755 struct notifier_ctx *notifier = NULL; 1756 1757 #ifdef ENABLE_PKCS11 1758 pkcs11_init(1); 1759 #endif 1760 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1761 if (pkcs11provider != NULL) { 1762 /* If a PKCS#11 token was specified then try to use it */ 1763 if ((ca = load_pkcs11_key(tmp)) == NULL) 1764 fatal("No PKCS#11 key matching %s found", ca_key_path); 1765 } else if (prefer_agent) { 1766 /* 1767 * Agent signature requested. Try to use agent after making 1768 * sure the public key specified is actually present in the 1769 * agent. 1770 */ 1771 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 1772 fatal_r(r, "Cannot load CA public key %s", tmp); 1773 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 1774 fatal_r(r, "Cannot use public key for CA signature"); 1775 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0) 1776 fatal_r(r, "Retrieve agent key list"); 1777 found = 0; 1778 for (j = 0; j < agent_ids->nkeys; j++) { 1779 if (sshkey_equal(ca, agent_ids->keys[j])) { 1780 found = 1; 1781 break; 1782 } 1783 } 1784 if (!found) 1785 fatal("CA key %s not found in agent", tmp); 1786 ssh_free_identitylist(agent_ids); 1787 ca->flags |= SSHKEY_FLAG_EXT; 1788 } else { 1789 /* CA key is assumed to be a private key on the filesystem */ 1790 ca = load_identity(tmp, NULL); 1791 if (sshkey_is_sk(ca) && 1792 (ca->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) { 1793 if ((pin = read_passphrase("Enter PIN for CA key: ", 1794 RP_ALLOW_STDIN)) == NULL) 1795 fatal_f("couldn't read PIN"); 1796 } 1797 } 1798 free(tmp); 1799 1800 if (key_type_name != NULL) { 1801 if (sshkey_type_from_name(key_type_name) != ca->type) { 1802 fatal("CA key type %s doesn't match specified %s", 1803 sshkey_ssh_name(ca), key_type_name); 1804 } 1805 } else if (ca->type == KEY_RSA) { 1806 /* Default to a good signature algorithm */ 1807 key_type_name = "rsa-sha2-512"; 1808 } 1809 ca_fp = sshkey_fingerprint(ca, fingerprint_hash, SSH_FP_DEFAULT); 1810 1811 finalise_cert_exts(); 1812 for (i = 0; i < argc; i++) { 1813 /* Split list of principals */ 1814 n = 0; 1815 if (cert_principals != NULL) { 1816 otmp = tmp = xstrdup(cert_principals); 1817 plist = NULL; 1818 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1819 plist = xreallocarray(plist, n + 1, sizeof(*plist)); 1820 if (*(plist[n] = xstrdup(cp)) == '\0') 1821 fatal("Empty principal name"); 1822 } 1823 free(otmp); 1824 } 1825 if (n > SSHKEY_CERT_MAX_PRINCIPALS) 1826 fatal("Too many certificate principals specified"); 1827 1828 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1829 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0) 1830 fatal_r(r, "load pubkey \"%s\"", tmp); 1831 if (sshkey_is_cert(public)) 1832 fatal_f("key \"%s\" type %s cannot be certified", 1833 tmp, sshkey_type(public)); 1834 1835 /* Prepare certificate to sign */ 1836 if ((r = sshkey_to_certified(public)) != 0) 1837 fatal_r(r, "Could not upgrade key %s to certificate", tmp); 1838 public->cert->type = cert_key_type; 1839 public->cert->serial = (u_int64_t)cert_serial; 1840 public->cert->key_id = xstrdup(cert_key_id); 1841 public->cert->nprincipals = n; 1842 public->cert->principals = plist; 1843 public->cert->valid_after = cert_valid_from; 1844 public->cert->valid_before = cert_valid_to; 1845 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL); 1846 prepare_options_buf(public->cert->extensions, 1847 OPTIONS_EXTENSIONS); 1848 if ((r = sshkey_from_private(ca, 1849 &public->cert->signature_key)) != 0) 1850 fatal_r(r, "sshkey_from_private (ca key)"); 1851 1852 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) { 1853 if ((r = sshkey_certify_custom(public, ca, 1854 key_type_name, sk_provider, NULL, agent_signer, 1855 &agent_fd)) != 0) 1856 fatal_r(r, "Couldn't certify %s via agent", tmp); 1857 } else { 1858 if (sshkey_is_sk(ca) && 1859 (ca->sk_flags & SSH_SK_USER_PRESENCE_REQD)) { 1860 notifier = notify_start(0, 1861 "Confirm user presence for key %s %s", 1862 sshkey_type(ca), ca_fp); 1863 } 1864 r = sshkey_certify(public, ca, key_type_name, 1865 sk_provider, pin); 1866 notify_complete(notifier, "User presence confirmed"); 1867 if (r != 0) 1868 fatal_r(r, "Couldn't certify key %s", tmp); 1869 } 1870 1871 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1872 *cp = '\0'; 1873 xasprintf(&out, "%s-cert.pub", tmp); 1874 free(tmp); 1875 1876 if ((r = sshkey_save_public(public, out, comment)) != 0) { 1877 fatal_r(r, "Unable to save public key to %s", 1878 identity_file); 1879 } 1880 1881 if (!quiet) { 1882 sshkey_format_cert_validity(public->cert, 1883 valid, sizeof(valid)); 1884 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1885 "valid %s", sshkey_cert_type(public), 1886 out, public->cert->key_id, 1887 (unsigned long long)public->cert->serial, 1888 cert_principals != NULL ? " for " : "", 1889 cert_principals != NULL ? cert_principals : "", 1890 valid); 1891 } 1892 1893 sshkey_free(public); 1894 free(out); 1895 if (cert_serial_autoinc) 1896 cert_serial++; 1897 } 1898 if (pin != NULL) 1899 freezero(pin, strlen(pin)); 1900 free(ca_fp); 1901 #ifdef ENABLE_PKCS11 1902 pkcs11_terminate(); 1903 #endif 1904 exit(0); 1905 } 1906 1907 static u_int64_t 1908 parse_relative_time(const char *s, time_t now) 1909 { 1910 int64_t mul, secs; 1911 1912 mul = *s == '-' ? -1 : 1; 1913 1914 if ((secs = convtime(s + 1)) == -1) 1915 fatal("Invalid relative certificate time %s", s); 1916 if (mul == -1 && secs > now) 1917 fatal("Certificate time %s cannot be represented", s); 1918 return now + (u_int64_t)(secs * mul); 1919 } 1920 1921 static void 1922 parse_hex_u64(const char *s, uint64_t *up) 1923 { 1924 char *ep; 1925 unsigned long long ull; 1926 1927 errno = 0; 1928 ull = strtoull(s, &ep, 16); 1929 if (*s == '\0' || *ep != '\0') 1930 fatal("Invalid certificate time: not a number"); 1931 if (errno == ERANGE && ull == ULONG_MAX) 1932 fatal_fr(SSH_ERR_SYSTEM_ERROR, "Invalid certificate time"); 1933 *up = (uint64_t)ull; 1934 } 1935 1936 static void 1937 parse_cert_times(char *timespec) 1938 { 1939 char *from, *to; 1940 time_t now = time(NULL); 1941 int64_t secs; 1942 1943 /* +timespec relative to now */ 1944 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1945 if ((secs = convtime(timespec + 1)) == -1) 1946 fatal("Invalid relative certificate life %s", timespec); 1947 cert_valid_to = now + secs; 1948 /* 1949 * Backdate certificate one minute to avoid problems on hosts 1950 * with poorly-synchronised clocks. 1951 */ 1952 cert_valid_from = ((now - 59)/ 60) * 60; 1953 return; 1954 } 1955 1956 /* 1957 * from:to, where 1958 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | 0x... | "always" 1959 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | 0x... | "forever" 1960 */ 1961 from = xstrdup(timespec); 1962 to = strchr(from, ':'); 1963 if (to == NULL || from == to || *(to + 1) == '\0') 1964 fatal("Invalid certificate life specification %s", timespec); 1965 *to++ = '\0'; 1966 1967 if (*from == '-' || *from == '+') 1968 cert_valid_from = parse_relative_time(from, now); 1969 else if (strcmp(from, "always") == 0) 1970 cert_valid_from = 0; 1971 else if (strncmp(from, "0x", 2) == 0) 1972 parse_hex_u64(from, &cert_valid_from); 1973 else if (parse_absolute_time(from, &cert_valid_from) != 0) 1974 fatal("Invalid from time \"%s\"", from); 1975 1976 if (*to == '-' || *to == '+') 1977 cert_valid_to = parse_relative_time(to, now); 1978 else if (strcmp(to, "forever") == 0) 1979 cert_valid_to = ~(u_int64_t)0; 1980 else if (strncmp(to, "0x", 2) == 0) 1981 parse_hex_u64(to, &cert_valid_to); 1982 else if (parse_absolute_time(to, &cert_valid_to) != 0) 1983 fatal("Invalid to time \"%s\"", to); 1984 1985 if (cert_valid_to <= cert_valid_from) 1986 fatal("Empty certificate validity interval"); 1987 free(from); 1988 } 1989 1990 static void 1991 add_cert_option(char *opt) 1992 { 1993 char *val, *cp; 1994 int iscrit = 0; 1995 1996 if (strcasecmp(opt, "clear") == 0) 1997 certflags_flags = 0; 1998 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1999 certflags_flags &= ~CERTOPT_X_FWD; 2000 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 2001 certflags_flags |= CERTOPT_X_FWD; 2002 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 2003 certflags_flags &= ~CERTOPT_AGENT_FWD; 2004 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 2005 certflags_flags |= CERTOPT_AGENT_FWD; 2006 else if (strcasecmp(opt, "no-port-forwarding") == 0) 2007 certflags_flags &= ~CERTOPT_PORT_FWD; 2008 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 2009 certflags_flags |= CERTOPT_PORT_FWD; 2010 else if (strcasecmp(opt, "no-pty") == 0) 2011 certflags_flags &= ~CERTOPT_PTY; 2012 else if (strcasecmp(opt, "permit-pty") == 0) 2013 certflags_flags |= CERTOPT_PTY; 2014 else if (strcasecmp(opt, "no-user-rc") == 0) 2015 certflags_flags &= ~CERTOPT_USER_RC; 2016 else if (strcasecmp(opt, "permit-user-rc") == 0) 2017 certflags_flags |= CERTOPT_USER_RC; 2018 else if (strcasecmp(opt, "touch-required") == 0) 2019 certflags_flags &= ~CERTOPT_NO_REQUIRE_USER_PRESENCE; 2020 else if (strcasecmp(opt, "no-touch-required") == 0) 2021 certflags_flags |= CERTOPT_NO_REQUIRE_USER_PRESENCE; 2022 else if (strcasecmp(opt, "no-verify-required") == 0) 2023 certflags_flags &= ~CERTOPT_REQUIRE_VERIFY; 2024 else if (strcasecmp(opt, "verify-required") == 0) 2025 certflags_flags |= CERTOPT_REQUIRE_VERIFY; 2026 else if (strncasecmp(opt, "force-command=", 14) == 0) { 2027 val = opt + 14; 2028 if (*val == '\0') 2029 fatal("Empty force-command option"); 2030 if (certflags_command != NULL) 2031 fatal("force-command already specified"); 2032 certflags_command = xstrdup(val); 2033 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 2034 val = opt + 15; 2035 if (*val == '\0') 2036 fatal("Empty source-address option"); 2037 if (certflags_src_addr != NULL) 2038 fatal("source-address already specified"); 2039 if (addr_match_cidr_list(NULL, val) != 0) 2040 fatal("Invalid source-address list"); 2041 certflags_src_addr = xstrdup(val); 2042 } else if (strncasecmp(opt, "extension:", 10) == 0 || 2043 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) { 2044 val = xstrdup(strchr(opt, ':') + 1); 2045 if ((cp = strchr(val, '=')) != NULL) 2046 *cp++ = '\0'; 2047 cert_ext_add(val, cp, iscrit); 2048 free(val); 2049 } else 2050 fatal("Unsupported certificate option \"%s\"", opt); 2051 } 2052 2053 static void 2054 show_options(struct sshbuf *optbuf, int in_critical) 2055 { 2056 char *name, *arg, *hex; 2057 struct sshbuf *options, *option = NULL; 2058 int r; 2059 2060 if ((options = sshbuf_fromb(optbuf)) == NULL) 2061 fatal_f("sshbuf_fromb failed"); 2062 while (sshbuf_len(options) != 0) { 2063 sshbuf_free(option); 2064 option = NULL; 2065 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 || 2066 (r = sshbuf_froms(options, &option)) != 0) 2067 fatal_fr(r, "parse option"); 2068 printf(" %s", name); 2069 if (!in_critical && 2070 (strcmp(name, "permit-X11-forwarding") == 0 || 2071 strcmp(name, "permit-agent-forwarding") == 0 || 2072 strcmp(name, "permit-port-forwarding") == 0 || 2073 strcmp(name, "permit-pty") == 0 || 2074 strcmp(name, "permit-user-rc") == 0 || 2075 strcmp(name, "no-touch-required") == 0)) { 2076 printf("\n"); 2077 } else if (in_critical && 2078 (strcmp(name, "force-command") == 0 || 2079 strcmp(name, "source-address") == 0)) { 2080 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0) 2081 fatal_fr(r, "parse critical"); 2082 printf(" %s\n", arg); 2083 free(arg); 2084 } else if (in_critical && 2085 strcmp(name, "verify-required") == 0) { 2086 printf("\n"); 2087 } else if (sshbuf_len(option) > 0) { 2088 hex = sshbuf_dtob16(option); 2089 printf(" UNKNOWN OPTION: %s (len %zu)\n", 2090 hex, sshbuf_len(option)); 2091 sshbuf_reset(option); 2092 free(hex); 2093 } else 2094 printf(" UNKNOWN FLAG OPTION\n"); 2095 free(name); 2096 if (sshbuf_len(option) != 0) 2097 fatal("Option corrupt: extra data at end"); 2098 } 2099 sshbuf_free(option); 2100 sshbuf_free(options); 2101 } 2102 2103 static void 2104 print_cert(struct sshkey *key) 2105 { 2106 char valid[64], *key_fp, *ca_fp; 2107 u_int i; 2108 2109 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT); 2110 ca_fp = sshkey_fingerprint(key->cert->signature_key, 2111 fingerprint_hash, SSH_FP_DEFAULT); 2112 if (key_fp == NULL || ca_fp == NULL) 2113 fatal_f("sshkey_fingerprint fail"); 2114 sshkey_format_cert_validity(key->cert, valid, sizeof(valid)); 2115 2116 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key), 2117 sshkey_cert_type(key)); 2118 printf(" Public key: %s %s\n", sshkey_type(key), key_fp); 2119 printf(" Signing CA: %s %s (using %s)\n", 2120 sshkey_type(key->cert->signature_key), ca_fp, 2121 key->cert->signature_type); 2122 printf(" Key ID: \"%s\"\n", key->cert->key_id); 2123 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial); 2124 printf(" Valid: %s\n", valid); 2125 printf(" Principals: "); 2126 if (key->cert->nprincipals == 0) 2127 printf("(none)\n"); 2128 else { 2129 for (i = 0; i < key->cert->nprincipals; i++) 2130 printf("\n %s", 2131 key->cert->principals[i]); 2132 printf("\n"); 2133 } 2134 printf(" Critical Options: "); 2135 if (sshbuf_len(key->cert->critical) == 0) 2136 printf("(none)\n"); 2137 else { 2138 printf("\n"); 2139 show_options(key->cert->critical, 1); 2140 } 2141 printf(" Extensions: "); 2142 if (sshbuf_len(key->cert->extensions) == 0) 2143 printf("(none)\n"); 2144 else { 2145 printf("\n"); 2146 show_options(key->cert->extensions, 0); 2147 } 2148 } 2149 2150 static void 2151 do_show_cert(struct passwd *pw) 2152 { 2153 struct sshkey *key = NULL; 2154 struct stat st; 2155 int r, is_stdin = 0, ok = 0; 2156 FILE *f; 2157 char *cp, *line = NULL; 2158 const char *path; 2159 size_t linesize = 0; 2160 u_long lnum = 0; 2161 2162 if (!have_identity) 2163 ask_filename(pw, "Enter file in which the key is"); 2164 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) == -1) 2165 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 2166 2167 path = identity_file; 2168 if (strcmp(path, "-") == 0) { 2169 f = stdin; 2170 path = "(stdin)"; 2171 is_stdin = 1; 2172 } else if ((f = fopen(identity_file, "r")) == NULL) 2173 fatal("fopen %s: %s", identity_file, strerror(errno)); 2174 2175 while (getline(&line, &linesize, f) != -1) { 2176 lnum++; 2177 sshkey_free(key); 2178 key = NULL; 2179 /* Trim leading space and comments */ 2180 cp = line + strspn(line, " \t"); 2181 if (*cp == '#' || *cp == '\0') 2182 continue; 2183 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2184 fatal("sshkey_new"); 2185 if ((r = sshkey_read(key, &cp)) != 0) { 2186 error_r(r, "%s:%lu: invalid key", path, lnum); 2187 continue; 2188 } 2189 if (!sshkey_is_cert(key)) { 2190 error("%s:%lu is not a certificate", path, lnum); 2191 continue; 2192 } 2193 ok = 1; 2194 if (!is_stdin && lnum == 1) 2195 printf("%s:\n", path); 2196 else 2197 printf("%s:%lu:\n", path, lnum); 2198 print_cert(key); 2199 } 2200 free(line); 2201 sshkey_free(key); 2202 fclose(f); 2203 exit(ok ? 0 : 1); 2204 } 2205 2206 static void 2207 load_krl(const char *path, struct ssh_krl **krlp) 2208 { 2209 struct sshbuf *krlbuf; 2210 int r; 2211 2212 if ((r = sshbuf_load_file(path, &krlbuf)) != 0) 2213 fatal_r(r, "Unable to load KRL %s", path); 2214 /* XXX check sigs */ 2215 if ((r = ssh_krl_from_blob(krlbuf, krlp)) != 0 || 2216 *krlp == NULL) 2217 fatal_r(r, "Invalid KRL file %s", path); 2218 sshbuf_free(krlbuf); 2219 } 2220 2221 static void 2222 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp, 2223 const char *file, u_long lnum) 2224 { 2225 char *tmp; 2226 size_t tlen; 2227 struct sshbuf *b; 2228 int r; 2229 2230 if (strncmp(cp, "SHA256:", 7) != 0) 2231 fatal("%s:%lu: unsupported hash algorithm", file, lnum); 2232 cp += 7; 2233 2234 /* 2235 * OpenSSH base64 hashes omit trailing '=' 2236 * characters; put them back for decode. 2237 */ 2238 if ((tlen = strlen(cp)) >= SIZE_MAX - 5) 2239 fatal_f("hash too long: %zu bytes", tlen); 2240 tmp = xmalloc(tlen + 4 + 1); 2241 strlcpy(tmp, cp, tlen + 1); 2242 while ((tlen % 4) != 0) { 2243 tmp[tlen++] = '='; 2244 tmp[tlen] = '\0'; 2245 } 2246 if ((b = sshbuf_new()) == NULL) 2247 fatal_f("sshbuf_new failed"); 2248 if ((r = sshbuf_b64tod(b, tmp)) != 0) 2249 fatal_r(r, "%s:%lu: decode hash failed", file, lnum); 2250 free(tmp); 2251 *lenp = sshbuf_len(b); 2252 *blobp = xmalloc(*lenp); 2253 memcpy(*blobp, sshbuf_ptr(b), *lenp); 2254 sshbuf_free(b); 2255 } 2256 2257 static void 2258 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca, 2259 const struct sshkey *ca, struct ssh_krl *krl) 2260 { 2261 struct sshkey *key = NULL; 2262 u_long lnum = 0; 2263 char *path, *cp, *ep, *line = NULL; 2264 u_char *blob = NULL; 2265 size_t blen = 0, linesize = 0; 2266 unsigned long long serial, serial2; 2267 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r; 2268 FILE *krl_spec; 2269 2270 path = tilde_expand_filename(file, pw->pw_uid); 2271 if (strcmp(path, "-") == 0) { 2272 krl_spec = stdin; 2273 free(path); 2274 path = xstrdup("(standard input)"); 2275 } else if ((krl_spec = fopen(path, "r")) == NULL) 2276 fatal("fopen %s: %s", path, strerror(errno)); 2277 2278 if (!quiet) 2279 printf("Revoking from %s\n", path); 2280 while (getline(&line, &linesize, krl_spec) != -1) { 2281 if (linesize >= INT_MAX) { 2282 fatal_f("%s contains unparsable line, len=%zu", 2283 path, linesize); 2284 } 2285 lnum++; 2286 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0; 2287 cp = line + strspn(line, " \t"); 2288 /* Trim trailing space, comments and strip \n */ 2289 for (i = 0, r = -1; cp[i] != '\0'; i++) { 2290 if (cp[i] == '#' || cp[i] == '\n') { 2291 cp[i] = '\0'; 2292 break; 2293 } 2294 if (cp[i] == ' ' || cp[i] == '\t') { 2295 /* Remember the start of a span of whitespace */ 2296 if (r == -1) 2297 r = i; 2298 } else 2299 r = -1; 2300 } 2301 if (r != -1) 2302 cp[r] = '\0'; 2303 if (*cp == '\0') 2304 continue; 2305 if (strncasecmp(cp, "serial:", 7) == 0) { 2306 if (ca == NULL && !wild_ca) { 2307 fatal("revoking certificates by serial number " 2308 "requires specification of a CA key"); 2309 } 2310 cp += 7; 2311 cp = cp + strspn(cp, " \t"); 2312 errno = 0; 2313 serial = strtoull(cp, &ep, 0); 2314 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 2315 fatal("%s:%lu: invalid serial \"%s\"", 2316 path, lnum, cp); 2317 if (errno == ERANGE && serial == ULLONG_MAX) 2318 fatal("%s:%lu: serial out of range", 2319 path, lnum); 2320 serial2 = serial; 2321 if (*ep == '-') { 2322 cp = ep + 1; 2323 errno = 0; 2324 serial2 = strtoull(cp, &ep, 0); 2325 if (*cp == '\0' || *ep != '\0') 2326 fatal("%s:%lu: invalid serial \"%s\"", 2327 path, lnum, cp); 2328 if (errno == ERANGE && serial2 == ULLONG_MAX) 2329 fatal("%s:%lu: serial out of range", 2330 path, lnum); 2331 if (serial2 <= serial) 2332 fatal("%s:%lu: invalid serial range " 2333 "%llu:%llu", path, lnum, 2334 (unsigned long long)serial, 2335 (unsigned long long)serial2); 2336 } 2337 if (ssh_krl_revoke_cert_by_serial_range(krl, 2338 ca, serial, serial2) != 0) { 2339 fatal_f("revoke serial failed"); 2340 } 2341 } else if (strncasecmp(cp, "id:", 3) == 0) { 2342 if (ca == NULL && !wild_ca) { 2343 fatal("revoking certificates by key ID " 2344 "requires specification of a CA key"); 2345 } 2346 cp += 3; 2347 cp = cp + strspn(cp, " \t"); 2348 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2349 fatal_f("revoke key ID failed"); 2350 } else if (strncasecmp(cp, "hash:", 5) == 0) { 2351 cp += 5; 2352 cp = cp + strspn(cp, " \t"); 2353 hash_to_blob(cp, &blob, &blen, file, lnum); 2354 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2355 if (r != 0) 2356 fatal_fr(r, "revoke key failed"); 2357 } else { 2358 if (strncasecmp(cp, "key:", 4) == 0) { 2359 cp += 4; 2360 cp = cp + strspn(cp, " \t"); 2361 was_explicit_key = 1; 2362 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2363 cp += 5; 2364 cp = cp + strspn(cp, " \t"); 2365 was_sha1 = 1; 2366 } else if (strncasecmp(cp, "sha256:", 7) == 0) { 2367 cp += 7; 2368 cp = cp + strspn(cp, " \t"); 2369 was_sha256 = 1; 2370 /* 2371 * Just try to process the line as a key. 2372 * Parsing will fail if it isn't. 2373 */ 2374 } 2375 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2376 fatal("sshkey_new"); 2377 if ((r = sshkey_read(key, &cp)) != 0) 2378 fatal_r(r, "%s:%lu: invalid key", path, lnum); 2379 if (was_explicit_key) 2380 r = ssh_krl_revoke_key_explicit(krl, key); 2381 else if (was_sha1) { 2382 if (sshkey_fingerprint_raw(key, 2383 SSH_DIGEST_SHA1, &blob, &blen) != 0) { 2384 fatal("%s:%lu: fingerprint failed", 2385 file, lnum); 2386 } 2387 r = ssh_krl_revoke_key_sha1(krl, blob, blen); 2388 } else if (was_sha256) { 2389 if (sshkey_fingerprint_raw(key, 2390 SSH_DIGEST_SHA256, &blob, &blen) != 0) { 2391 fatal("%s:%lu: fingerprint failed", 2392 file, lnum); 2393 } 2394 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2395 } else 2396 r = ssh_krl_revoke_key(krl, key); 2397 if (r != 0) 2398 fatal_fr(r, "revoke key failed"); 2399 freezero(blob, blen); 2400 blob = NULL; 2401 blen = 0; 2402 sshkey_free(key); 2403 } 2404 } 2405 if (strcmp(path, "-") != 0) 2406 fclose(krl_spec); 2407 free(line); 2408 free(path); 2409 } 2410 2411 static void 2412 do_gen_krl(struct passwd *pw, int updating, const char *ca_key_path, 2413 unsigned long long krl_version, const char *krl_comment, 2414 int argc, char **argv) 2415 { 2416 struct ssh_krl *krl; 2417 struct stat sb; 2418 struct sshkey *ca = NULL; 2419 int i, r, wild_ca = 0; 2420 char *tmp; 2421 struct sshbuf *kbuf; 2422 2423 if (*identity_file == '\0') 2424 fatal("KRL generation requires an output file"); 2425 if (stat(identity_file, &sb) == -1) { 2426 if (errno != ENOENT) 2427 fatal("Cannot access KRL \"%s\": %s", 2428 identity_file, strerror(errno)); 2429 if (updating) 2430 fatal("KRL \"%s\" does not exist", identity_file); 2431 } 2432 if (ca_key_path != NULL) { 2433 if (strcasecmp(ca_key_path, "none") == 0) 2434 wild_ca = 1; 2435 else { 2436 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2437 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 2438 fatal_r(r, "Cannot load CA public key %s", tmp); 2439 free(tmp); 2440 } 2441 } 2442 2443 if (updating) 2444 load_krl(identity_file, &krl); 2445 else if ((krl = ssh_krl_init()) == NULL) 2446 fatal("couldn't create KRL"); 2447 2448 if (krl_version != 0) 2449 ssh_krl_set_version(krl, krl_version); 2450 if (krl_comment != NULL) 2451 ssh_krl_set_comment(krl, krl_comment); 2452 2453 for (i = 0; i < argc; i++) 2454 update_krl_from_file(pw, argv[i], wild_ca, ca, krl); 2455 2456 if ((kbuf = sshbuf_new()) == NULL) 2457 fatal("sshbuf_new failed"); 2458 if (ssh_krl_to_blob(krl, kbuf) != 0) 2459 fatal("Couldn't generate KRL"); 2460 if ((r = sshbuf_write_file(identity_file, kbuf)) != 0) 2461 fatal("write %s: %s", identity_file, strerror(errno)); 2462 sshbuf_free(kbuf); 2463 ssh_krl_free(krl); 2464 sshkey_free(ca); 2465 } 2466 2467 static void 2468 do_check_krl(struct passwd *pw, int print_krl, int argc, char **argv) 2469 { 2470 int i, r, ret = 0; 2471 char *comment; 2472 struct ssh_krl *krl; 2473 struct sshkey *k; 2474 2475 if (*identity_file == '\0') 2476 fatal("KRL checking requires an input file"); 2477 load_krl(identity_file, &krl); 2478 if (print_krl) 2479 krl_dump(krl, stdout); 2480 for (i = 0; i < argc; i++) { 2481 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0) 2482 fatal_r(r, "Cannot load public key %s", argv[i]); 2483 r = ssh_krl_check_key(krl, k); 2484 printf("%s%s%s%s: %s\n", argv[i], 2485 *comment ? " (" : "", comment, *comment ? ")" : "", 2486 r == 0 ? "ok" : "REVOKED"); 2487 if (r != 0) 2488 ret = 1; 2489 sshkey_free(k); 2490 free(comment); 2491 } 2492 ssh_krl_free(krl); 2493 exit(ret); 2494 } 2495 2496 static struct sshkey * 2497 load_sign_key(const char *keypath, const struct sshkey *pubkey) 2498 { 2499 size_t i, slen, plen = strlen(keypath); 2500 char *privpath = xstrdup(keypath); 2501 static const char * const suffixes[] = { "-cert.pub", ".pub", NULL }; 2502 struct sshkey *ret = NULL, *privkey = NULL; 2503 int r, waspub = 0; 2504 struct stat st; 2505 2506 /* 2507 * If passed a public key filename, then try to locate the corresponding 2508 * private key. This lets us specify certificates on the command-line 2509 * and have ssh-keygen find the appropriate private key. 2510 */ 2511 for (i = 0; suffixes[i]; i++) { 2512 slen = strlen(suffixes[i]); 2513 if (plen <= slen || 2514 strcmp(privpath + plen - slen, suffixes[i]) != 0) 2515 continue; 2516 privpath[plen - slen] = '\0'; 2517 debug_f("%s looks like a public key, using private key " 2518 "path %s instead", keypath, privpath); 2519 waspub = 1; 2520 } 2521 if (waspub && stat(privpath, &st) != 0 && errno == ENOENT) 2522 fatal("No private key found for public key \"%s\"", keypath); 2523 if ((r = sshkey_load_private(privpath, "", &privkey, NULL)) != 0 && 2524 (r != SSH_ERR_KEY_WRONG_PASSPHRASE)) { 2525 debug_fr(r, "load private key \"%s\"", privpath); 2526 fatal("No private key found for \"%s\"", privpath); 2527 } else if (privkey == NULL) 2528 privkey = load_identity(privpath, NULL); 2529 2530 if (!sshkey_equal_public(pubkey, privkey)) { 2531 error("Public key %s doesn't match private %s", 2532 keypath, privpath); 2533 goto done; 2534 } 2535 if (sshkey_is_cert(pubkey) && !sshkey_is_cert(privkey)) { 2536 /* 2537 * Graft the certificate onto the private key to make 2538 * it capable of signing. 2539 */ 2540 if ((r = sshkey_to_certified(privkey)) != 0) { 2541 error_fr(r, "sshkey_to_certified"); 2542 goto done; 2543 } 2544 if ((r = sshkey_cert_copy(pubkey, privkey)) != 0) { 2545 error_fr(r, "sshkey_cert_copy"); 2546 goto done; 2547 } 2548 } 2549 /* success */ 2550 ret = privkey; 2551 privkey = NULL; 2552 done: 2553 sshkey_free(privkey); 2554 free(privpath); 2555 return ret; 2556 } 2557 2558 static int 2559 sign_one(struct sshkey *signkey, const char *filename, int fd, 2560 const char *sig_namespace, const char *hashalg, sshsig_signer *signer, 2561 void *signer_ctx) 2562 { 2563 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2564 int r = SSH_ERR_INTERNAL_ERROR, wfd = -1, oerrno; 2565 char *wfile = NULL, *asig = NULL, *fp = NULL; 2566 char *pin = NULL, *prompt = NULL; 2567 2568 if (!quiet) { 2569 if (fd == STDIN_FILENO) 2570 fprintf(stderr, "Signing data on standard input\n"); 2571 else 2572 fprintf(stderr, "Signing file %s\n", filename); 2573 } 2574 if (signer == NULL && sshkey_is_sk(signkey)) { 2575 if ((signkey->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) { 2576 xasprintf(&prompt, "Enter PIN for %s key: ", 2577 sshkey_type(signkey)); 2578 if ((pin = read_passphrase(prompt, 2579 RP_ALLOW_STDIN)) == NULL) 2580 fatal_f("couldn't read PIN"); 2581 } 2582 if ((signkey->sk_flags & SSH_SK_USER_PRESENCE_REQD)) { 2583 if ((fp = sshkey_fingerprint(signkey, fingerprint_hash, 2584 SSH_FP_DEFAULT)) == NULL) 2585 fatal_f("fingerprint failed"); 2586 fprintf(stderr, "Confirm user presence for key %s %s\n", 2587 sshkey_type(signkey), fp); 2588 free(fp); 2589 } 2590 } 2591 if ((r = sshsig_sign_fd(signkey, hashalg, sk_provider, pin, 2592 fd, sig_namespace, &sigbuf, signer, signer_ctx)) != 0) { 2593 error_r(r, "Signing %s failed", filename); 2594 goto out; 2595 } 2596 if ((r = sshsig_armor(sigbuf, &abuf)) != 0) { 2597 error_fr(r, "sshsig_armor"); 2598 goto out; 2599 } 2600 if ((asig = sshbuf_dup_string(abuf)) == NULL) { 2601 error_f("buffer error"); 2602 r = SSH_ERR_ALLOC_FAIL; 2603 goto out; 2604 } 2605 2606 if (fd == STDIN_FILENO) { 2607 fputs(asig, stdout); 2608 fflush(stdout); 2609 } else { 2610 xasprintf(&wfile, "%s.sig", filename); 2611 if (confirm_overwrite(wfile)) { 2612 if ((wfd = open(wfile, O_WRONLY|O_CREAT|O_TRUNC, 2613 0666)) == -1) { 2614 oerrno = errno; 2615 error("Cannot open %s: %s", 2616 wfile, strerror(errno)); 2617 errno = oerrno; 2618 r = SSH_ERR_SYSTEM_ERROR; 2619 goto out; 2620 } 2621 if (atomicio(vwrite, wfd, asig, 2622 strlen(asig)) != strlen(asig)) { 2623 oerrno = errno; 2624 error("Cannot write to %s: %s", 2625 wfile, strerror(errno)); 2626 errno = oerrno; 2627 r = SSH_ERR_SYSTEM_ERROR; 2628 goto out; 2629 } 2630 if (!quiet) { 2631 fprintf(stderr, "Write signature to %s\n", 2632 wfile); 2633 } 2634 } 2635 } 2636 /* success */ 2637 r = 0; 2638 out: 2639 free(wfile); 2640 free(prompt); 2641 free(asig); 2642 if (pin != NULL) 2643 freezero(pin, strlen(pin)); 2644 sshbuf_free(abuf); 2645 sshbuf_free(sigbuf); 2646 if (wfd != -1) 2647 close(wfd); 2648 return r; 2649 } 2650 2651 static int 2652 sig_process_opts(char * const *opts, size_t nopts, char **hashalgp, 2653 uint64_t *verify_timep, int *print_pubkey) 2654 { 2655 size_t i; 2656 time_t now; 2657 2658 if (verify_timep != NULL) 2659 *verify_timep = 0; 2660 if (print_pubkey != NULL) 2661 *print_pubkey = 0; 2662 if (hashalgp != NULL) 2663 *hashalgp = NULL; 2664 for (i = 0; i < nopts; i++) { 2665 if (hashalgp != NULL && 2666 strncasecmp(opts[i], "hashalg=", 8) == 0) { 2667 *hashalgp = xstrdup(opts[i] + 8); 2668 } else if (verify_timep && 2669 strncasecmp(opts[i], "verify-time=", 12) == 0) { 2670 if (parse_absolute_time(opts[i] + 12, 2671 verify_timep) != 0 || *verify_timep == 0) { 2672 error("Invalid \"verify-time\" option"); 2673 return SSH_ERR_INVALID_ARGUMENT; 2674 } 2675 } else if (print_pubkey && 2676 strcasecmp(opts[i], "print-pubkey") == 0) { 2677 *print_pubkey = 1; 2678 } else { 2679 error("Invalid option \"%s\"", opts[i]); 2680 return SSH_ERR_INVALID_ARGUMENT; 2681 } 2682 } 2683 if (verify_timep && *verify_timep == 0) { 2684 if ((now = time(NULL)) < 0) { 2685 error("Time is before epoch"); 2686 return SSH_ERR_INVALID_ARGUMENT; 2687 } 2688 *verify_timep = (uint64_t)now; 2689 } 2690 return 0; 2691 } 2692 2693 2694 static int 2695 sig_sign(const char *keypath, const char *sig_namespace, int require_agent, 2696 int argc, char **argv, char * const *opts, size_t nopts) 2697 { 2698 int i, fd = -1, r, ret = -1; 2699 int agent_fd = -1; 2700 struct sshkey *pubkey = NULL, *privkey = NULL, *signkey = NULL; 2701 sshsig_signer *signer = NULL; 2702 char *hashalg = NULL; 2703 2704 /* Check file arguments. */ 2705 for (i = 0; i < argc; i++) { 2706 if (strcmp(argv[i], "-") != 0) 2707 continue; 2708 if (i > 0 || argc > 1) 2709 fatal("Cannot sign mix of paths and standard input"); 2710 } 2711 2712 if (sig_process_opts(opts, nopts, &hashalg, NULL, NULL) != 0) 2713 goto done; /* error already logged */ 2714 2715 if ((r = sshkey_load_public(keypath, &pubkey, NULL)) != 0) { 2716 error_r(r, "Couldn't load public key %s", keypath); 2717 goto done; 2718 } 2719 2720 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) { 2721 if (require_agent) 2722 fatal("Couldn't get agent socket"); 2723 debug_r(r, "Couldn't get agent socket"); 2724 } else { 2725 if ((r = ssh_agent_has_key(agent_fd, pubkey)) == 0) 2726 signer = agent_signer; 2727 else { 2728 if (require_agent) 2729 fatal("Couldn't find key in agent"); 2730 debug_r(r, "Couldn't find key in agent"); 2731 } 2732 } 2733 2734 if (signer == NULL) { 2735 /* Not using agent - try to load private key */ 2736 if ((privkey = load_sign_key(keypath, pubkey)) == NULL) 2737 goto done; 2738 signkey = privkey; 2739 } else { 2740 /* Will use key in agent */ 2741 signkey = pubkey; 2742 } 2743 2744 if (argc == 0) { 2745 if ((r = sign_one(signkey, "(stdin)", STDIN_FILENO, 2746 sig_namespace, hashalg, signer, &agent_fd)) != 0) 2747 goto done; 2748 } else { 2749 for (i = 0; i < argc; i++) { 2750 if (strcmp(argv[i], "-") == 0) 2751 fd = STDIN_FILENO; 2752 else if ((fd = open(argv[i], O_RDONLY)) == -1) { 2753 error("Cannot open %s for signing: %s", 2754 argv[i], strerror(errno)); 2755 goto done; 2756 } 2757 if ((r = sign_one(signkey, argv[i], fd, sig_namespace, 2758 hashalg, signer, &agent_fd)) != 0) 2759 goto done; 2760 if (fd != STDIN_FILENO) 2761 close(fd); 2762 fd = -1; 2763 } 2764 } 2765 2766 ret = 0; 2767 done: 2768 if (fd != -1 && fd != STDIN_FILENO) 2769 close(fd); 2770 sshkey_free(pubkey); 2771 sshkey_free(privkey); 2772 free(hashalg); 2773 return ret; 2774 } 2775 2776 static int 2777 sig_verify(const char *signature, const char *sig_namespace, 2778 const char *principal, const char *allowed_keys, const char *revoked_keys, 2779 char * const *opts, size_t nopts) 2780 { 2781 int r, ret = -1; 2782 int print_pubkey = 0; 2783 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2784 struct sshkey *sign_key = NULL; 2785 char *fp = NULL; 2786 struct sshkey_sig_details *sig_details = NULL; 2787 uint64_t verify_time = 0; 2788 2789 if (sig_process_opts(opts, nopts, NULL, &verify_time, 2790 &print_pubkey) != 0) 2791 goto done; /* error already logged */ 2792 2793 memset(&sig_details, 0, sizeof(sig_details)); 2794 if ((r = sshbuf_load_file(signature, &abuf)) != 0) { 2795 error_r(r, "Couldn't read signature file"); 2796 goto done; 2797 } 2798 2799 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) { 2800 error_fr(r, "sshsig_armor"); 2801 goto done; 2802 } 2803 if ((r = sshsig_verify_fd(sigbuf, STDIN_FILENO, sig_namespace, 2804 &sign_key, &sig_details)) != 0) 2805 goto done; /* sshsig_verify() prints error */ 2806 2807 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash, 2808 SSH_FP_DEFAULT)) == NULL) 2809 fatal_f("sshkey_fingerprint failed"); 2810 debug("Valid (unverified) signature from key %s", fp); 2811 if (sig_details != NULL) { 2812 debug2_f("signature details: counter = %u, flags = 0x%02x", 2813 sig_details->sk_counter, sig_details->sk_flags); 2814 } 2815 free(fp); 2816 fp = NULL; 2817 2818 if (revoked_keys != NULL) { 2819 if ((r = sshkey_check_revoked(sign_key, revoked_keys)) != 0) { 2820 debug3_fr(r, "sshkey_check_revoked"); 2821 goto done; 2822 } 2823 } 2824 2825 if (allowed_keys != NULL && (r = sshsig_check_allowed_keys(allowed_keys, 2826 sign_key, principal, sig_namespace, verify_time)) != 0) { 2827 debug3_fr(r, "sshsig_check_allowed_keys"); 2828 goto done; 2829 } 2830 /* success */ 2831 ret = 0; 2832 done: 2833 if (!quiet) { 2834 if (ret == 0) { 2835 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash, 2836 SSH_FP_DEFAULT)) == NULL) 2837 fatal_f("sshkey_fingerprint failed"); 2838 if (principal == NULL) { 2839 printf("Good \"%s\" signature with %s key %s\n", 2840 sig_namespace, sshkey_type(sign_key), fp); 2841 2842 } else { 2843 printf("Good \"%s\" signature for %s with %s key %s\n", 2844 sig_namespace, principal, 2845 sshkey_type(sign_key), fp); 2846 } 2847 } else { 2848 printf("Could not verify signature.\n"); 2849 } 2850 } 2851 /* Print the signature key if requested */ 2852 if (ret == 0 && print_pubkey && sign_key != NULL) { 2853 if ((r = sshkey_write(sign_key, stdout)) == 0) 2854 fputc('\n', stdout); 2855 else { 2856 error_r(r, "Could not print public key.\n"); 2857 ret = -1; 2858 } 2859 } 2860 sshbuf_free(sigbuf); 2861 sshbuf_free(abuf); 2862 sshkey_free(sign_key); 2863 sshkey_sig_details_free(sig_details); 2864 free(fp); 2865 return ret; 2866 } 2867 2868 static int 2869 sig_find_principals(const char *signature, const char *allowed_keys, 2870 char * const *opts, size_t nopts) 2871 { 2872 int r, ret = -1; 2873 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2874 struct sshkey *sign_key = NULL; 2875 char *principals = NULL, *cp, *tmp; 2876 uint64_t verify_time = 0; 2877 2878 if (sig_process_opts(opts, nopts, NULL, &verify_time, NULL) != 0) 2879 goto done; /* error already logged */ 2880 2881 if ((r = sshbuf_load_file(signature, &abuf)) != 0) { 2882 error_r(r, "Couldn't read signature file"); 2883 goto done; 2884 } 2885 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) { 2886 error_fr(r, "sshsig_armor"); 2887 goto done; 2888 } 2889 if ((r = sshsig_get_pubkey(sigbuf, &sign_key)) != 0) { 2890 error_fr(r, "sshsig_get_pubkey"); 2891 goto done; 2892 } 2893 if ((r = sshsig_find_principals(allowed_keys, sign_key, 2894 verify_time, &principals)) != 0) { 2895 if (r != SSH_ERR_KEY_NOT_FOUND) 2896 error_fr(r, "sshsig_find_principal"); 2897 goto done; 2898 } 2899 ret = 0; 2900 done: 2901 if (ret == 0 ) { 2902 /* Emit matching principals one per line */ 2903 tmp = principals; 2904 while ((cp = strsep(&tmp, ",")) != NULL && *cp != '\0') 2905 puts(cp); 2906 } else { 2907 fprintf(stderr, "No principal matched.\n"); 2908 } 2909 sshbuf_free(sigbuf); 2910 sshbuf_free(abuf); 2911 sshkey_free(sign_key); 2912 free(principals); 2913 return ret; 2914 } 2915 2916 static int 2917 sig_match_principals(const char *allowed_keys, char *principal, 2918 char * const *opts, size_t nopts) 2919 { 2920 int r; 2921 char **principals = NULL; 2922 size_t i, nprincipals = 0; 2923 2924 if ((r = sig_process_opts(opts, nopts, NULL, NULL, NULL)) != 0) 2925 return r; /* error already logged */ 2926 2927 if ((r = sshsig_match_principals(allowed_keys, principal, 2928 &principals, &nprincipals)) != 0) { 2929 debug_f("match: %s", ssh_err(r)); 2930 fprintf(stderr, "No principal matched.\n"); 2931 return r; 2932 } 2933 for (i = 0; i < nprincipals; i++) { 2934 printf("%s\n", principals[i]); 2935 free(principals[i]); 2936 } 2937 free(principals); 2938 2939 return 0; 2940 } 2941 2942 static void 2943 do_moduli_gen(const char *out_file, char **opts, size_t nopts) 2944 { 2945 #ifdef WITH_OPENSSL 2946 /* Moduli generation/screening */ 2947 u_int32_t memory = 0; 2948 BIGNUM *start = NULL; 2949 int moduli_bits = 0; 2950 FILE *out; 2951 size_t i; 2952 const char *errstr; 2953 2954 /* Parse options */ 2955 for (i = 0; i < nopts; i++) { 2956 if (strncmp(opts[i], "memory=", 7) == 0) { 2957 memory = (u_int32_t)strtonum(opts[i]+7, 1, 2958 UINT_MAX, &errstr); 2959 if (errstr) { 2960 fatal("Memory limit is %s: %s", 2961 errstr, opts[i]+7); 2962 } 2963 } else if (strncmp(opts[i], "start=", 6) == 0) { 2964 /* XXX - also compare length against bits */ 2965 if (BN_hex2bn(&start, opts[i]+6) == 0) 2966 fatal("Invalid start point."); 2967 } else if (strncmp(opts[i], "bits=", 5) == 0) { 2968 moduli_bits = (int)strtonum(opts[i]+5, 1, 2969 INT_MAX, &errstr); 2970 if (errstr) { 2971 fatal("Invalid number: %s (%s)", 2972 opts[i]+12, errstr); 2973 } 2974 } else { 2975 fatal("Option \"%s\" is unsupported for moduli " 2976 "generation", opts[i]); 2977 } 2978 } 2979 2980 if ((out = fopen(out_file, "w")) == NULL) { 2981 fatal("Couldn't open modulus candidate file \"%s\": %s", 2982 out_file, strerror(errno)); 2983 } 2984 setvbuf(out, NULL, _IOLBF, 0); 2985 2986 if (moduli_bits == 0) 2987 moduli_bits = DEFAULT_BITS; 2988 if (gen_candidates(out, memory, moduli_bits, start) != 0) 2989 fatal("modulus candidate generation failed"); 2990 #else /* WITH_OPENSSL */ 2991 fatal("Moduli generation is not supported"); 2992 #endif /* WITH_OPENSSL */ 2993 } 2994 2995 static void 2996 do_moduli_screen(const char *out_file, char **opts, size_t nopts) 2997 { 2998 #ifdef WITH_OPENSSL 2999 /* Moduli generation/screening */ 3000 char *checkpoint = NULL; 3001 u_int32_t generator_wanted = 0; 3002 unsigned long start_lineno = 0, lines_to_process = 0; 3003 int prime_tests = 0; 3004 FILE *out, *in = stdin; 3005 size_t i; 3006 const char *errstr; 3007 3008 /* Parse options */ 3009 for (i = 0; i < nopts; i++) { 3010 if (strncmp(opts[i], "lines=", 6) == 0) { 3011 lines_to_process = strtoul(opts[i]+6, NULL, 10); 3012 } else if (strncmp(opts[i], "start-line=", 11) == 0) { 3013 start_lineno = strtoul(opts[i]+11, NULL, 10); 3014 } else if (strncmp(opts[i], "checkpoint=", 11) == 0) { 3015 free(checkpoint); 3016 checkpoint = xstrdup(opts[i]+11); 3017 } else if (strncmp(opts[i], "generator=", 10) == 0) { 3018 generator_wanted = (u_int32_t)strtonum( 3019 opts[i]+10, 1, UINT_MAX, &errstr); 3020 if (errstr != NULL) { 3021 fatal("Generator invalid: %s (%s)", 3022 opts[i]+10, errstr); 3023 } 3024 } else if (strncmp(opts[i], "prime-tests=", 12) == 0) { 3025 prime_tests = (int)strtonum(opts[i]+12, 1, 3026 INT_MAX, &errstr); 3027 if (errstr) { 3028 fatal("Invalid number: %s (%s)", 3029 opts[i]+12, errstr); 3030 } 3031 } else { 3032 fatal("Option \"%s\" is unsupported for moduli " 3033 "screening", opts[i]); 3034 } 3035 } 3036 3037 if (have_identity && strcmp(identity_file, "-") != 0) { 3038 if ((in = fopen(identity_file, "r")) == NULL) { 3039 fatal("Couldn't open modulus candidate " 3040 "file \"%s\": %s", identity_file, 3041 strerror(errno)); 3042 } 3043 } 3044 3045 if ((out = fopen(out_file, "a")) == NULL) { 3046 fatal("Couldn't open moduli file \"%s\": %s", 3047 out_file, strerror(errno)); 3048 } 3049 setvbuf(out, NULL, _IOLBF, 0); 3050 if (prime_test(in, out, prime_tests == 0 ? 100 : prime_tests, 3051 generator_wanted, checkpoint, 3052 start_lineno, lines_to_process) != 0) 3053 fatal("modulus screening failed"); 3054 if (in != stdin) 3055 (void)fclose(in); 3056 free(checkpoint); 3057 #else /* WITH_OPENSSL */ 3058 fatal("Moduli screening is not supported"); 3059 #endif /* WITH_OPENSSL */ 3060 } 3061 3062 /* Read and confirm a passphrase */ 3063 static char * 3064 read_check_passphrase(const char *prompt1, const char *prompt2, 3065 const char *retry_prompt) 3066 { 3067 char *passphrase1, *passphrase2; 3068 3069 for (;;) { 3070 passphrase1 = read_passphrase(prompt1, RP_ALLOW_STDIN); 3071 passphrase2 = read_passphrase(prompt2, RP_ALLOW_STDIN); 3072 if (strcmp(passphrase1, passphrase2) == 0) { 3073 freezero(passphrase2, strlen(passphrase2)); 3074 return passphrase1; 3075 } 3076 /* The passphrases do not match. Clear them and retry. */ 3077 freezero(passphrase1, strlen(passphrase1)); 3078 freezero(passphrase2, strlen(passphrase2)); 3079 fputs(retry_prompt, stdout); 3080 fputc('\n', stdout); 3081 fflush(stdout); 3082 } 3083 /* NOTREACHED */ 3084 return NULL; 3085 } 3086 3087 static char * 3088 private_key_passphrase(void) 3089 { 3090 if (identity_passphrase) 3091 return xstrdup(identity_passphrase); 3092 if (identity_new_passphrase) 3093 return xstrdup(identity_new_passphrase); 3094 3095 return read_check_passphrase( 3096 "Enter passphrase (empty for no passphrase): ", 3097 "Enter same passphrase again: ", 3098 "Passphrases do not match. Try again."); 3099 } 3100 3101 static char * 3102 sk_suffix(const char *application, const uint8_t *user, size_t userlen) 3103 { 3104 char *ret, *cp; 3105 size_t slen, i; 3106 3107 /* Trim off URL-like preamble */ 3108 if (strncmp(application, "ssh://", 6) == 0) 3109 ret = xstrdup(application + 6); 3110 else if (strncmp(application, "ssh:", 4) == 0) 3111 ret = xstrdup(application + 4); 3112 else 3113 ret = xstrdup(application); 3114 3115 /* Count trailing zeros in user */ 3116 for (i = 0; i < userlen; i++) { 3117 if (user[userlen - i - 1] != 0) 3118 break; 3119 } 3120 if (i >= userlen) 3121 return ret; /* user-id was default all-zeros */ 3122 3123 /* Append user-id, escaping non-UTF-8 characters */ 3124 slen = userlen - i; 3125 if (asmprintf(&cp, INT_MAX, NULL, "%.*s", (int)slen, user) == -1) 3126 fatal_f("asmprintf failed"); 3127 /* Don't emit a user-id that contains path or control characters */ 3128 if (strchr(cp, '/') != NULL || strstr(cp, "..") != NULL || 3129 strchr(cp, '\\') != NULL) { 3130 free(cp); 3131 cp = tohex(user, slen); 3132 } 3133 xextendf(&ret, "_", "%s", cp); 3134 free(cp); 3135 return ret; 3136 } 3137 3138 static int 3139 do_download_sk(const char *skprovider, const char *device) 3140 { 3141 struct sshsk_resident_key **srks; 3142 size_t nsrks, i; 3143 int r, ret = -1; 3144 char *fp, *pin = NULL, *pass = NULL, *path, *pubpath; 3145 const char *ext; 3146 struct sshkey *key; 3147 3148 if (skprovider == NULL) 3149 fatal("Cannot download keys without provider"); 3150 3151 pin = read_passphrase("Enter PIN for authenticator: ", RP_ALLOW_STDIN); 3152 if (!quiet) { 3153 printf("You may need to touch your authenticator " 3154 "to authorize key download.\n"); 3155 } 3156 if ((r = sshsk_load_resident(skprovider, device, pin, 0, 3157 &srks, &nsrks)) != 0) { 3158 if (pin != NULL) 3159 freezero(pin, strlen(pin)); 3160 error_r(r, "Unable to load resident keys"); 3161 return -1; 3162 } 3163 if (nsrks == 0) 3164 logit("No keys to download"); 3165 if (pin != NULL) 3166 freezero(pin, strlen(pin)); 3167 3168 for (i = 0; i < nsrks; i++) { 3169 key = srks[i]->key; 3170 if (key->type != KEY_ECDSA_SK && key->type != KEY_ED25519_SK) { 3171 error("Unsupported key type %s (%d)", 3172 sshkey_type(key), key->type); 3173 continue; 3174 } 3175 if ((fp = sshkey_fingerprint(key, fingerprint_hash, 3176 SSH_FP_DEFAULT)) == NULL) 3177 fatal_f("sshkey_fingerprint failed"); 3178 debug_f("key %zu: %s %s %s (flags 0x%02x)", i, 3179 sshkey_type(key), fp, key->sk_application, key->sk_flags); 3180 ext = sk_suffix(key->sk_application, 3181 srks[i]->user_id, srks[i]->user_id_len); 3182 xasprintf(&path, "id_%s_rk%s%s", 3183 key->type == KEY_ECDSA_SK ? "ecdsa_sk" : "ed25519_sk", 3184 *ext == '\0' ? "" : "_", ext); 3185 3186 /* If the file already exists, ask the user to confirm. */ 3187 if (!confirm_overwrite(path)) { 3188 free(path); 3189 break; 3190 } 3191 3192 /* Save the key with the application string as the comment */ 3193 if (pass == NULL) 3194 pass = private_key_passphrase(); 3195 if ((r = sshkey_save_private(key, path, pass, 3196 key->sk_application, private_key_format, 3197 openssh_format_cipher, rounds)) != 0) { 3198 error_r(r, "Saving key \"%s\" failed", path); 3199 free(path); 3200 break; 3201 } 3202 if (!quiet) { 3203 printf("Saved %s key%s%s to %s\n", sshkey_type(key), 3204 *ext != '\0' ? " " : "", 3205 *ext != '\0' ? key->sk_application : "", 3206 path); 3207 } 3208 3209 /* Save public key too */ 3210 xasprintf(&pubpath, "%s.pub", path); 3211 free(path); 3212 if ((r = sshkey_save_public(key, pubpath, 3213 key->sk_application)) != 0) { 3214 error_r(r, "Saving public key \"%s\" failed", pubpath); 3215 free(pubpath); 3216 break; 3217 } 3218 free(pubpath); 3219 } 3220 3221 if (i >= nsrks) 3222 ret = 0; /* success */ 3223 if (pass != NULL) 3224 freezero(pass, strlen(pass)); 3225 sshsk_free_resident_keys(srks, nsrks); 3226 return ret; 3227 } 3228 3229 static void 3230 save_attestation(struct sshbuf *attest, const char *path) 3231 { 3232 mode_t omask; 3233 int r; 3234 3235 if (path == NULL) 3236 return; /* nothing to do */ 3237 if (attest == NULL || sshbuf_len(attest) == 0) 3238 fatal("Enrollment did not return attestation data"); 3239 omask = umask(077); 3240 r = sshbuf_write_file(path, attest); 3241 umask(omask); 3242 if (r != 0) 3243 fatal_r(r, "Unable to write attestation data \"%s\"", path); 3244 if (!quiet) 3245 printf("Your FIDO attestation certificate has been saved in " 3246 "%s\n", path); 3247 } 3248 3249 static int 3250 confirm_sk_overwrite(const char *application, const char *user) 3251 { 3252 char yesno[3]; 3253 3254 printf("A resident key scoped to '%s' with user id '%s' already " 3255 "exists.\n", application == NULL ? "ssh:" : application, 3256 user == NULL ? "null" : user); 3257 printf("Overwrite key in token (y/n)? "); 3258 fflush(stdout); 3259 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 3260 return 0; 3261 if (yesno[0] != 'y' && yesno[0] != 'Y') 3262 return 0; 3263 return 1; 3264 } 3265 3266 static void 3267 usage(void) 3268 { 3269 fprintf(stderr, 3270 "usage: ssh-keygen [-q] [-a rounds] [-b bits] [-C comment] [-f output_keyfile]\n" 3271 " [-m format] [-N new_passphrase] [-O option]\n" 3272 " [-t dsa | ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa]\n" 3273 " [-w provider] [-Z cipher]\n" 3274 " ssh-keygen -p [-a rounds] [-f keyfile] [-m format] [-N new_passphrase]\n" 3275 " [-P old_passphrase] [-Z cipher]\n" 3276 #ifdef WITH_OPENSSL 3277 " ssh-keygen -i [-f input_keyfile] [-m key_format]\n" 3278 " ssh-keygen -e [-f input_keyfile] [-m key_format]\n" 3279 #endif 3280 " ssh-keygen -y [-f input_keyfile]\n" 3281 " ssh-keygen -c [-a rounds] [-C comment] [-f keyfile] [-P passphrase]\n" 3282 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n" 3283 " ssh-keygen -B [-f input_keyfile]\n"); 3284 #ifdef ENABLE_PKCS11 3285 fprintf(stderr, 3286 " ssh-keygen -D pkcs11\n"); 3287 #endif 3288 fprintf(stderr, 3289 " ssh-keygen -F hostname [-lv] [-f known_hosts_file]\n" 3290 " ssh-keygen -H [-f known_hosts_file]\n" 3291 " ssh-keygen -K [-a rounds] [-w provider]\n" 3292 " ssh-keygen -R hostname [-f known_hosts_file]\n" 3293 " ssh-keygen -r hostname [-g] [-f input_keyfile]\n" 3294 #ifdef WITH_OPENSSL 3295 " ssh-keygen -M generate [-O option] output_file\n" 3296 " ssh-keygen -M screen [-f input_file] [-O option] output_file\n" 3297 #endif 3298 " ssh-keygen -I certificate_identity -s ca_key [-hU] [-D pkcs11_provider]\n" 3299 " [-n principals] [-O option] [-V validity_interval]\n" 3300 " [-z serial_number] file ...\n" 3301 " ssh-keygen -L [-f input_keyfile]\n" 3302 " ssh-keygen -A [-a rounds] [-f prefix_path]\n" 3303 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n" 3304 " file ...\n" 3305 " ssh-keygen -Q [-l] -f krl_file [file ...]\n" 3306 " ssh-keygen -Y find-principals -s signature_file -f allowed_signers_file\n" 3307 " ssh-keygen -Y match-principals -I signer_identity -f allowed_signers_file\n" 3308 " ssh-keygen -Y check-novalidate -n namespace -s signature_file\n" 3309 " ssh-keygen -Y sign -f key_file -n namespace file [-O option] ...\n" 3310 " ssh-keygen -Y verify -f allowed_signers_file -I signer_identity\n" 3311 " -n namespace -s signature_file [-r krl_file] [-O option]\n"); 3312 exit(1); 3313 } 3314 3315 /* 3316 * Main program for key management. 3317 */ 3318 int 3319 main(int argc, char **argv) 3320 { 3321 char comment[1024], *passphrase = NULL; 3322 char *rr_hostname = NULL, *ep, *fp, *ra; 3323 struct sshkey *private, *public; 3324 struct passwd *pw; 3325 int r, opt, type; 3326 int change_passphrase = 0, change_comment = 0, show_cert = 0; 3327 int find_host = 0, delete_host = 0, hash_hosts = 0; 3328 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 3329 int prefer_agent = 0, convert_to = 0, convert_from = 0; 3330 int print_public = 0, print_generic = 0, cert_serial_autoinc = 0; 3331 int do_gen_candidates = 0, do_screen_candidates = 0, download_sk = 0; 3332 unsigned long long cert_serial = 0; 3333 char *identity_comment = NULL, *ca_key_path = NULL, **opts = NULL; 3334 char *sk_application = NULL, *sk_device = NULL, *sk_user = NULL; 3335 char *sk_attestation_path = NULL; 3336 struct sshbuf *challenge = NULL, *attest = NULL; 3337 size_t i, nopts = 0; 3338 u_int32_t bits = 0; 3339 uint8_t sk_flags = SSH_SK_USER_PRESENCE_REQD; 3340 const char *errstr; 3341 int log_level = SYSLOG_LEVEL_INFO; 3342 char *sign_op = NULL; 3343 3344 extern int optind; 3345 extern char *optarg; 3346 3347 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 3348 sanitise_stdfd(); 3349 3350 #ifdef WITH_OPENSSL 3351 OpenSSL_add_all_algorithms(); 3352 #endif 3353 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 3354 3355 setlocale(LC_CTYPE, ""); 3356 3357 /* we need this for the home * directory. */ 3358 pw = getpwuid(getuid()); 3359 if (!pw) 3360 fatal("No user exists for uid %lu", (u_long)getuid()); 3361 pw = pwcopy(pw); 3362 if (gethostname(hostname, sizeof(hostname)) == -1) 3363 fatal("gethostname: %s", strerror(errno)); 3364 3365 sk_provider = getenv("SSH_SK_PROVIDER"); 3366 3367 /* Remaining characters: dGjJSTWx */ 3368 while ((opt = getopt(argc, argv, "ABHKLQUXceghiklopquvy" 3369 "C:D:E:F:I:M:N:O:P:R:V:Y:Z:" 3370 "a:b:f:g:m:n:r:s:t:w:z:")) != -1) { 3371 switch (opt) { 3372 case 'A': 3373 gen_all_hostkeys = 1; 3374 break; 3375 case 'b': 3376 bits = (u_int32_t)strtonum(optarg, 1, UINT32_MAX, 3377 &errstr); 3378 if (errstr) 3379 fatal("Bits has bad value %s (%s)", 3380 optarg, errstr); 3381 break; 3382 case 'E': 3383 fingerprint_hash = ssh_digest_alg_by_name(optarg); 3384 if (fingerprint_hash == -1) 3385 fatal("Invalid hash algorithm \"%s\"", optarg); 3386 break; 3387 case 'F': 3388 find_host = 1; 3389 rr_hostname = optarg; 3390 break; 3391 case 'H': 3392 hash_hosts = 1; 3393 break; 3394 case 'I': 3395 cert_key_id = optarg; 3396 break; 3397 case 'R': 3398 delete_host = 1; 3399 rr_hostname = optarg; 3400 break; 3401 case 'L': 3402 show_cert = 1; 3403 break; 3404 case 'l': 3405 print_fingerprint = 1; 3406 break; 3407 case 'B': 3408 print_bubblebabble = 1; 3409 break; 3410 case 'm': 3411 if (strcasecmp(optarg, "RFC4716") == 0 || 3412 strcasecmp(optarg, "ssh2") == 0) { 3413 convert_format = FMT_RFC4716; 3414 break; 3415 } 3416 if (strcasecmp(optarg, "PKCS8") == 0) { 3417 convert_format = FMT_PKCS8; 3418 private_key_format = SSHKEY_PRIVATE_PKCS8; 3419 break; 3420 } 3421 if (strcasecmp(optarg, "PEM") == 0) { 3422 convert_format = FMT_PEM; 3423 private_key_format = SSHKEY_PRIVATE_PEM; 3424 break; 3425 } 3426 fatal("Unsupported conversion format \"%s\"", optarg); 3427 case 'n': 3428 cert_principals = optarg; 3429 break; 3430 case 'o': 3431 /* no-op; new format is already the default */ 3432 break; 3433 case 'p': 3434 change_passphrase = 1; 3435 break; 3436 case 'c': 3437 change_comment = 1; 3438 break; 3439 case 'f': 3440 if (strlcpy(identity_file, optarg, 3441 sizeof(identity_file)) >= sizeof(identity_file)) 3442 fatal("Identity filename too long"); 3443 have_identity = 1; 3444 break; 3445 case 'g': 3446 print_generic = 1; 3447 break; 3448 case 'K': 3449 download_sk = 1; 3450 break; 3451 case 'P': 3452 identity_passphrase = optarg; 3453 break; 3454 case 'N': 3455 identity_new_passphrase = optarg; 3456 break; 3457 case 'Q': 3458 check_krl = 1; 3459 break; 3460 case 'O': 3461 opts = xrecallocarray(opts, nopts, nopts + 1, 3462 sizeof(*opts)); 3463 opts[nopts++] = xstrdup(optarg); 3464 break; 3465 case 'Z': 3466 openssh_format_cipher = optarg; 3467 if (cipher_by_name(openssh_format_cipher) == NULL) 3468 fatal("Invalid OpenSSH-format cipher '%s'", 3469 openssh_format_cipher); 3470 break; 3471 case 'C': 3472 identity_comment = optarg; 3473 break; 3474 case 'q': 3475 quiet = 1; 3476 break; 3477 case 'e': 3478 /* export key */ 3479 convert_to = 1; 3480 break; 3481 case 'h': 3482 cert_key_type = SSH2_CERT_TYPE_HOST; 3483 certflags_flags = 0; 3484 break; 3485 case 'k': 3486 gen_krl = 1; 3487 break; 3488 case 'i': 3489 case 'X': 3490 /* import key */ 3491 convert_from = 1; 3492 break; 3493 case 'y': 3494 print_public = 1; 3495 break; 3496 case 's': 3497 ca_key_path = optarg; 3498 break; 3499 case 't': 3500 key_type_name = optarg; 3501 break; 3502 case 'D': 3503 pkcs11provider = optarg; 3504 break; 3505 case 'U': 3506 prefer_agent = 1; 3507 break; 3508 case 'u': 3509 update_krl = 1; 3510 break; 3511 case 'v': 3512 if (log_level == SYSLOG_LEVEL_INFO) 3513 log_level = SYSLOG_LEVEL_DEBUG1; 3514 else { 3515 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 3516 log_level < SYSLOG_LEVEL_DEBUG3) 3517 log_level++; 3518 } 3519 break; 3520 case 'r': 3521 rr_hostname = optarg; 3522 break; 3523 case 'a': 3524 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr); 3525 if (errstr) 3526 fatal("Invalid number: %s (%s)", 3527 optarg, errstr); 3528 break; 3529 case 'V': 3530 parse_cert_times(optarg); 3531 break; 3532 case 'Y': 3533 sign_op = optarg; 3534 break; 3535 case 'w': 3536 sk_provider = optarg; 3537 break; 3538 case 'z': 3539 errno = 0; 3540 if (*optarg == '+') { 3541 cert_serial_autoinc = 1; 3542 optarg++; 3543 } 3544 cert_serial = strtoull(optarg, &ep, 10); 3545 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 3546 (errno == ERANGE && cert_serial == ULLONG_MAX)) 3547 fatal("Invalid serial number \"%s\"", optarg); 3548 break; 3549 case 'M': 3550 if (strcmp(optarg, "generate") == 0) 3551 do_gen_candidates = 1; 3552 else if (strcmp(optarg, "screen") == 0) 3553 do_screen_candidates = 1; 3554 else 3555 fatal("Unsupported moduli option %s", optarg); 3556 break; 3557 default: 3558 usage(); 3559 } 3560 } 3561 3562 if (sk_provider == NULL) 3563 sk_provider = "internal"; 3564 3565 /* reinit */ 3566 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 3567 3568 argv += optind; 3569 argc -= optind; 3570 3571 if (sign_op != NULL) { 3572 if (strncmp(sign_op, "find-principals", 15) == 0) { 3573 if (ca_key_path == NULL) { 3574 error("Too few arguments for find-principals:" 3575 "missing signature file"); 3576 exit(1); 3577 } 3578 if (!have_identity) { 3579 error("Too few arguments for find-principals:" 3580 "missing allowed keys file"); 3581 exit(1); 3582 } 3583 return sig_find_principals(ca_key_path, identity_file, 3584 opts, nopts); 3585 } else if (strncmp(sign_op, "match-principals", 16) == 0) { 3586 if (!have_identity) { 3587 error("Too few arguments for match-principals:" 3588 "missing allowed keys file"); 3589 exit(1); 3590 } 3591 if (cert_key_id == NULL) { 3592 error("Too few arguments for match-principals: " 3593 "missing principal ID"); 3594 exit(1); 3595 } 3596 return sig_match_principals(identity_file, cert_key_id, 3597 opts, nopts); 3598 } else if (strncmp(sign_op, "sign", 4) == 0) { 3599 /* NB. cert_principals is actually namespace, via -n */ 3600 if (cert_principals == NULL || 3601 *cert_principals == '\0') { 3602 error("Too few arguments for sign: " 3603 "missing namespace"); 3604 exit(1); 3605 } 3606 if (!have_identity) { 3607 error("Too few arguments for sign: " 3608 "missing key"); 3609 exit(1); 3610 } 3611 return sig_sign(identity_file, cert_principals, 3612 prefer_agent, argc, argv, opts, nopts); 3613 } else if (strncmp(sign_op, "check-novalidate", 16) == 0) { 3614 /* NB. cert_principals is actually namespace, via -n */ 3615 if (cert_principals == NULL || 3616 *cert_principals == '\0') { 3617 error("Too few arguments for check-novalidate: " 3618 "missing namespace"); 3619 exit(1); 3620 } 3621 if (ca_key_path == NULL) { 3622 error("Too few arguments for check-novalidate: " 3623 "missing signature file"); 3624 exit(1); 3625 } 3626 return sig_verify(ca_key_path, cert_principals, 3627 NULL, NULL, NULL, opts, nopts); 3628 } else if (strncmp(sign_op, "verify", 6) == 0) { 3629 /* NB. cert_principals is actually namespace, via -n */ 3630 if (cert_principals == NULL || 3631 *cert_principals == '\0') { 3632 error("Too few arguments for verify: " 3633 "missing namespace"); 3634 exit(1); 3635 } 3636 if (ca_key_path == NULL) { 3637 error("Too few arguments for verify: " 3638 "missing signature file"); 3639 exit(1); 3640 } 3641 if (!have_identity) { 3642 error("Too few arguments for sign: " 3643 "missing allowed keys file"); 3644 exit(1); 3645 } 3646 if (cert_key_id == NULL) { 3647 error("Too few arguments for verify: " 3648 "missing principal identity"); 3649 exit(1); 3650 } 3651 return sig_verify(ca_key_path, cert_principals, 3652 cert_key_id, identity_file, rr_hostname, 3653 opts, nopts); 3654 } 3655 error("Unsupported operation for -Y: \"%s\"", sign_op); 3656 usage(); 3657 /* NOTREACHED */ 3658 } 3659 3660 if (ca_key_path != NULL) { 3661 if (argc < 1 && !gen_krl) { 3662 error("Too few arguments."); 3663 usage(); 3664 } 3665 } else if (argc > 0 && !gen_krl && !check_krl && 3666 !do_gen_candidates && !do_screen_candidates) { 3667 error("Too many arguments."); 3668 usage(); 3669 } 3670 if (change_passphrase && change_comment) { 3671 error("Can only have one of -p and -c."); 3672 usage(); 3673 } 3674 if (print_fingerprint && (delete_host || hash_hosts)) { 3675 error("Cannot use -l with -H or -R."); 3676 usage(); 3677 } 3678 if (gen_krl) { 3679 do_gen_krl(pw, update_krl, ca_key_path, 3680 cert_serial, identity_comment, argc, argv); 3681 return (0); 3682 } 3683 if (check_krl) { 3684 do_check_krl(pw, print_fingerprint, argc, argv); 3685 return (0); 3686 } 3687 if (ca_key_path != NULL) { 3688 if (cert_key_id == NULL) 3689 fatal("Must specify key id (-I) when certifying"); 3690 for (i = 0; i < nopts; i++) 3691 add_cert_option(opts[i]); 3692 do_ca_sign(pw, ca_key_path, prefer_agent, 3693 cert_serial, cert_serial_autoinc, argc, argv); 3694 } 3695 if (show_cert) 3696 do_show_cert(pw); 3697 if (delete_host || hash_hosts || find_host) { 3698 do_known_hosts(pw, rr_hostname, find_host, 3699 delete_host, hash_hosts); 3700 } 3701 if (pkcs11provider != NULL) 3702 do_download(pw); 3703 if (download_sk) { 3704 for (i = 0; i < nopts; i++) { 3705 if (strncasecmp(opts[i], "device=", 7) == 0) { 3706 sk_device = xstrdup(opts[i] + 7); 3707 } else { 3708 fatal("Option \"%s\" is unsupported for " 3709 "FIDO authenticator download", opts[i]); 3710 } 3711 } 3712 return do_download_sk(sk_provider, sk_device); 3713 } 3714 if (print_fingerprint || print_bubblebabble) 3715 do_fingerprint(pw); 3716 if (change_passphrase) 3717 do_change_passphrase(pw); 3718 if (change_comment) 3719 do_change_comment(pw, identity_comment); 3720 #ifdef WITH_OPENSSL 3721 if (convert_to) 3722 do_convert_to(pw); 3723 if (convert_from) 3724 do_convert_from(pw); 3725 #else /* WITH_OPENSSL */ 3726 if (convert_to || convert_from) 3727 fatal("key conversion disabled at compile time"); 3728 #endif /* WITH_OPENSSL */ 3729 if (print_public) 3730 do_print_public(pw); 3731 if (rr_hostname != NULL) { 3732 unsigned int n = 0; 3733 3734 if (have_identity) { 3735 n = do_print_resource_record(pw, identity_file, 3736 rr_hostname, print_generic, opts, nopts); 3737 if (n == 0) 3738 fatal("%s: %s", identity_file, strerror(errno)); 3739 exit(0); 3740 } else { 3741 3742 n += do_print_resource_record(pw, 3743 _PATH_HOST_RSA_KEY_FILE, rr_hostname, 3744 print_generic, opts, nopts); 3745 #ifdef WITH_DSA 3746 n += do_print_resource_record(pw, 3747 _PATH_HOST_DSA_KEY_FILE, rr_hostname, 3748 print_generic, opts, nopts); 3749 #endif 3750 n += do_print_resource_record(pw, 3751 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname, 3752 print_generic, opts, nopts); 3753 n += do_print_resource_record(pw, 3754 _PATH_HOST_ED25519_KEY_FILE, rr_hostname, 3755 print_generic, opts, nopts); 3756 n += do_print_resource_record(pw, 3757 _PATH_HOST_XMSS_KEY_FILE, rr_hostname, 3758 print_generic, opts, nopts); 3759 if (n == 0) 3760 fatal("no keys found."); 3761 exit(0); 3762 } 3763 } 3764 3765 if (do_gen_candidates || do_screen_candidates) { 3766 if (argc <= 0) 3767 fatal("No output file specified"); 3768 else if (argc > 1) 3769 fatal("Too many output files specified"); 3770 } 3771 if (do_gen_candidates) { 3772 do_moduli_gen(argv[0], opts, nopts); 3773 return 0; 3774 } 3775 if (do_screen_candidates) { 3776 do_moduli_screen(argv[0], opts, nopts); 3777 return 0; 3778 } 3779 3780 if (gen_all_hostkeys) { 3781 do_gen_all_hostkeys(pw); 3782 return (0); 3783 } 3784 3785 if (key_type_name == NULL) 3786 key_type_name = DEFAULT_KEY_TYPE_NAME; 3787 3788 type = sshkey_type_from_name(key_type_name); 3789 type_bits_valid(type, key_type_name, &bits); 3790 3791 if (!quiet) 3792 printf("Generating public/private %s key pair.\n", 3793 key_type_name); 3794 switch (type) { 3795 case KEY_ECDSA_SK: 3796 case KEY_ED25519_SK: 3797 for (i = 0; i < nopts; i++) { 3798 if (strcasecmp(opts[i], "no-touch-required") == 0) { 3799 sk_flags &= ~SSH_SK_USER_PRESENCE_REQD; 3800 } else if (strcasecmp(opts[i], "verify-required") == 0) { 3801 sk_flags |= SSH_SK_USER_VERIFICATION_REQD; 3802 } else if (strcasecmp(opts[i], "resident") == 0) { 3803 sk_flags |= SSH_SK_RESIDENT_KEY; 3804 } else if (strncasecmp(opts[i], "device=", 7) == 0) { 3805 sk_device = xstrdup(opts[i] + 7); 3806 } else if (strncasecmp(opts[i], "user=", 5) == 0) { 3807 sk_user = xstrdup(opts[i] + 5); 3808 } else if (strncasecmp(opts[i], "challenge=", 10) == 0) { 3809 if ((r = sshbuf_load_file(opts[i] + 10, 3810 &challenge)) != 0) { 3811 fatal_r(r, "Unable to load FIDO " 3812 "enrollment challenge \"%s\"", 3813 opts[i] + 10); 3814 } 3815 } else if (strncasecmp(opts[i], 3816 "write-attestation=", 18) == 0) { 3817 sk_attestation_path = opts[i] + 18; 3818 } else if (strncasecmp(opts[i], 3819 "application=", 12) == 0) { 3820 sk_application = xstrdup(opts[i] + 12); 3821 if (strncmp(sk_application, "ssh:", 4) != 0) { 3822 fatal("FIDO application string must " 3823 "begin with \"ssh:\""); 3824 } 3825 } else { 3826 fatal("Option \"%s\" is unsupported for " 3827 "FIDO authenticator enrollment", opts[i]); 3828 } 3829 } 3830 if ((attest = sshbuf_new()) == NULL) 3831 fatal("sshbuf_new failed"); 3832 r = 0; 3833 for (i = 0 ;;) { 3834 if (!quiet) { 3835 printf("You may need to touch your " 3836 "authenticator%s to authorize key " 3837 "generation.\n", 3838 r == 0 ? "" : " again"); 3839 } 3840 fflush(stdout); 3841 r = sshsk_enroll(type, sk_provider, sk_device, 3842 sk_application == NULL ? "ssh:" : sk_application, 3843 sk_user, sk_flags, passphrase, challenge, 3844 &private, attest); 3845 if (r == 0) 3846 break; 3847 if (r == SSH_ERR_KEY_BAD_PERMISSIONS && 3848 (sk_flags & SSH_SK_RESIDENT_KEY) != 0 && 3849 (sk_flags & SSH_SK_FORCE_OPERATION) == 0 && 3850 confirm_sk_overwrite(sk_application, sk_user)) { 3851 sk_flags |= SSH_SK_FORCE_OPERATION; 3852 continue; 3853 } 3854 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 3855 fatal_r(r, "Key enrollment failed"); 3856 else if (passphrase != NULL) { 3857 error("PIN incorrect"); 3858 freezero(passphrase, strlen(passphrase)); 3859 passphrase = NULL; 3860 } 3861 if (++i >= 3) 3862 fatal("Too many incorrect PINs"); 3863 passphrase = read_passphrase("Enter PIN for " 3864 "authenticator: ", RP_ALLOW_STDIN); 3865 } 3866 if (passphrase != NULL) { 3867 freezero(passphrase, strlen(passphrase)); 3868 passphrase = NULL; 3869 } 3870 break; 3871 default: 3872 if ((r = sshkey_generate(type, bits, &private)) != 0) 3873 fatal("sshkey_generate failed"); 3874 break; 3875 } 3876 if ((r = sshkey_from_private(private, &public)) != 0) 3877 fatal_r(r, "sshkey_from_private"); 3878 3879 if (!have_identity) 3880 ask_filename(pw, "Enter file in which to save the key"); 3881 3882 /* Create ~/.ssh directory if it doesn't already exist. */ 3883 hostfile_create_user_ssh_dir(identity_file, !quiet); 3884 3885 /* If the file already exists, ask the user to confirm. */ 3886 if (!confirm_overwrite(identity_file)) 3887 exit(1); 3888 3889 /* Determine the passphrase for the private key */ 3890 passphrase = private_key_passphrase(); 3891 if (identity_comment) { 3892 strlcpy(comment, identity_comment, sizeof(comment)); 3893 } else { 3894 /* Create default comment field for the passphrase. */ 3895 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 3896 } 3897 3898 /* Save the key with the given passphrase and comment. */ 3899 if ((r = sshkey_save_private(private, identity_file, passphrase, 3900 comment, private_key_format, openssh_format_cipher, rounds)) != 0) { 3901 error_r(r, "Saving key \"%s\" failed", identity_file); 3902 freezero(passphrase, strlen(passphrase)); 3903 exit(1); 3904 } 3905 freezero(passphrase, strlen(passphrase)); 3906 sshkey_free(private); 3907 3908 if (!quiet) { 3909 printf("Your identification has been saved in %s\n", 3910 identity_file); 3911 } 3912 3913 strlcat(identity_file, ".pub", sizeof(identity_file)); 3914 if ((r = sshkey_save_public(public, identity_file, comment)) != 0) 3915 fatal_r(r, "Unable to save public key to %s", identity_file); 3916 3917 if (!quiet) { 3918 fp = sshkey_fingerprint(public, fingerprint_hash, 3919 SSH_FP_DEFAULT); 3920 ra = sshkey_fingerprint(public, fingerprint_hash, 3921 SSH_FP_RANDOMART); 3922 if (fp == NULL || ra == NULL) 3923 fatal("sshkey_fingerprint failed"); 3924 printf("Your public key has been saved in %s\n", 3925 identity_file); 3926 printf("The key fingerprint is:\n"); 3927 printf("%s %s\n", fp, comment); 3928 printf("The key's randomart image is:\n"); 3929 printf("%s\n", ra); 3930 free(ra); 3931 free(fp); 3932 } 3933 3934 if (sk_attestation_path != NULL) 3935 save_attestation(attest, sk_attestation_path); 3936 3937 sshbuf_free(attest); 3938 sshkey_free(public); 3939 3940 exit(0); 3941 } 3942