1 /* $OpenBSD: ssh-keygen.c,v 1.454 2022/06/03 03:17:42 dtucker Exp $ */ 2 /* 3 * Author: Tatu Ylonen <ylo@cs.hut.fi> 4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * Identity and host key generation and maintenance. 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 */ 14 15 #include <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 #ifdef WITH_OPENSSL 65 # define DEFAULT_KEY_TYPE_NAME "rsa" 66 #else 67 # define DEFAULT_KEY_TYPE_NAME "ed25519" 68 #endif 69 70 /* 71 * Default number of bits in the RSA, DSA and ECDSA keys. These value can be 72 * overridden on the command line. 73 * 74 * These values, with the exception of DSA, provide security equivalent to at 75 * least 128 bits of security according to NIST Special Publication 800-57: 76 * Recommendation for Key Management Part 1 rev 4 section 5.6.1. 77 * For DSA it (and FIPS-186-4 section 4.2) specifies that the only size for 78 * which a 160bit hash is acceptable is 1kbit, and since ssh-dss specifies only 79 * SHA1 we limit the DSA key size 1k bits. 80 */ 81 #define DEFAULT_BITS 3072 82 #define DEFAULT_BITS_DSA 1024 83 #define DEFAULT_BITS_ECDSA 256 84 85 static int quiet = 0; 86 87 /* Flag indicating that we just want to see the key fingerprint */ 88 static int print_fingerprint = 0; 89 static int print_bubblebabble = 0; 90 91 /* Hash algorithm to use for fingerprints. */ 92 static int fingerprint_hash = SSH_FP_HASH_DEFAULT; 93 94 /* The identity file name, given on the command line or entered by the user. */ 95 static char identity_file[PATH_MAX]; 96 static int have_identity = 0; 97 98 /* This is set to the passphrase if given on the command line. */ 99 static char *identity_passphrase = NULL; 100 101 /* This is set to the new passphrase if given on the command line. */ 102 static char *identity_new_passphrase = NULL; 103 104 /* Key type when certifying */ 105 static u_int cert_key_type = SSH2_CERT_TYPE_USER; 106 107 /* "key ID" of signed key */ 108 static char *cert_key_id = NULL; 109 110 /* Comma-separated list of principal names for certifying keys */ 111 static char *cert_principals = NULL; 112 113 /* Validity period for certificates */ 114 static u_int64_t cert_valid_from = 0; 115 static u_int64_t cert_valid_to = ~0ULL; 116 117 /* Certificate options */ 118 #define CERTOPT_X_FWD (1) 119 #define CERTOPT_AGENT_FWD (1<<1) 120 #define CERTOPT_PORT_FWD (1<<2) 121 #define CERTOPT_PTY (1<<3) 122 #define CERTOPT_USER_RC (1<<4) 123 #define CERTOPT_NO_REQUIRE_USER_PRESENCE (1<<5) 124 #define CERTOPT_REQUIRE_VERIFY (1<<6) 125 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 126 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 127 static u_int32_t certflags_flags = CERTOPT_DEFAULT; 128 static char *certflags_command = NULL; 129 static char *certflags_src_addr = NULL; 130 131 /* Arbitrary extensions specified by user */ 132 struct cert_ext { 133 char *key; 134 char *val; 135 int crit; 136 }; 137 static struct cert_ext *cert_ext; 138 static size_t ncert_ext; 139 140 /* Conversion to/from various formats */ 141 enum { 142 FMT_RFC4716, 143 FMT_PKCS8, 144 FMT_PEM 145 } convert_format = FMT_RFC4716; 146 147 static char *key_type_name = NULL; 148 149 /* Load key from this PKCS#11 provider */ 150 static char *pkcs11provider = NULL; 151 152 /* FIDO/U2F provider to use */ 153 static char *sk_provider = NULL; 154 155 /* Format for writing private keys */ 156 static int private_key_format = SSHKEY_PRIVATE_OPENSSH; 157 158 /* Cipher for new-format private keys */ 159 static char *openssh_format_cipher = NULL; 160 161 /* Number of KDF rounds to derive new format keys. */ 162 static int rounds = 0; 163 164 /* argv0 */ 165 extern char *__progname; 166 167 static char hostname[NI_MAXHOST]; 168 169 #ifdef WITH_OPENSSL 170 /* moduli.c */ 171 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 172 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 173 unsigned long); 174 #endif 175 176 static void 177 type_bits_valid(int type, const char *name, u_int32_t *bitsp) 178 { 179 if (type == KEY_UNSPEC) 180 fatal("unknown key type %s", key_type_name); 181 if (*bitsp == 0) { 182 #ifdef WITH_OPENSSL 183 int nid; 184 185 switch(type) { 186 case KEY_DSA: 187 *bitsp = DEFAULT_BITS_DSA; 188 break; 189 case KEY_ECDSA: 190 if (name != NULL && 191 (nid = sshkey_ecdsa_nid_from_name(name)) > 0) 192 *bitsp = sshkey_curve_nid_to_bits(nid); 193 if (*bitsp == 0) 194 *bitsp = DEFAULT_BITS_ECDSA; 195 break; 196 case KEY_RSA: 197 *bitsp = DEFAULT_BITS; 198 break; 199 } 200 #endif 201 } 202 #ifdef WITH_OPENSSL 203 switch (type) { 204 case KEY_DSA: 205 if (*bitsp != 1024) 206 fatal("Invalid DSA key length: must be 1024 bits"); 207 break; 208 case KEY_RSA: 209 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE) 210 fatal("Invalid RSA key length: minimum is %d bits", 211 SSH_RSA_MINIMUM_MODULUS_SIZE); 212 else if (*bitsp > OPENSSL_RSA_MAX_MODULUS_BITS) 213 fatal("Invalid RSA key length: maximum is %d bits", 214 OPENSSL_RSA_MAX_MODULUS_BITS); 215 break; 216 case KEY_ECDSA: 217 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1) 218 fatal("Invalid ECDSA key length: valid lengths are " 219 "256, 384 or 521 bits"); 220 } 221 #endif 222 } 223 224 /* 225 * Checks whether a file exists and, if so, asks the user whether they wish 226 * to overwrite it. 227 * Returns nonzero if the file does not already exist or if the user agrees to 228 * overwrite, or zero otherwise. 229 */ 230 static int 231 confirm_overwrite(const char *filename) 232 { 233 char yesno[3]; 234 struct stat st; 235 236 if (stat(filename, &st) != 0) 237 return 1; 238 printf("%s already exists.\n", filename); 239 printf("Overwrite (y/n)? "); 240 fflush(stdout); 241 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 242 return 0; 243 if (yesno[0] != 'y' && yesno[0] != 'Y') 244 return 0; 245 return 1; 246 } 247 248 static void 249 ask_filename(struct passwd *pw, const char *prompt) 250 { 251 char buf[1024]; 252 char *name = NULL; 253 254 if (key_type_name == NULL) 255 name = _PATH_SSH_CLIENT_ID_RSA; 256 else { 257 switch (sshkey_type_from_name(key_type_name)) { 258 case KEY_DSA_CERT: 259 case KEY_DSA: 260 name = _PATH_SSH_CLIENT_ID_DSA; 261 break; 262 case KEY_ECDSA_CERT: 263 case KEY_ECDSA: 264 name = _PATH_SSH_CLIENT_ID_ECDSA; 265 break; 266 case KEY_ECDSA_SK_CERT: 267 case KEY_ECDSA_SK: 268 name = _PATH_SSH_CLIENT_ID_ECDSA_SK; 269 break; 270 case KEY_RSA_CERT: 271 case KEY_RSA: 272 name = _PATH_SSH_CLIENT_ID_RSA; 273 break; 274 case KEY_ED25519: 275 case KEY_ED25519_CERT: 276 name = _PATH_SSH_CLIENT_ID_ED25519; 277 break; 278 case KEY_ED25519_SK: 279 case KEY_ED25519_SK_CERT: 280 name = _PATH_SSH_CLIENT_ID_ED25519_SK; 281 break; 282 case KEY_XMSS: 283 case KEY_XMSS_CERT: 284 name = _PATH_SSH_CLIENT_ID_XMSS; 285 break; 286 default: 287 fatal("bad key type"); 288 } 289 } 290 snprintf(identity_file, sizeof(identity_file), 291 "%s/%s", pw->pw_dir, name); 292 printf("%s (%s): ", prompt, identity_file); 293 fflush(stdout); 294 if (fgets(buf, sizeof(buf), stdin) == NULL) 295 exit(1); 296 buf[strcspn(buf, "\n")] = '\0'; 297 if (strcmp(buf, "") != 0) 298 strlcpy(identity_file, buf, sizeof(identity_file)); 299 have_identity = 1; 300 } 301 302 static struct sshkey * 303 load_identity(const char *filename, char **commentp) 304 { 305 char *pass; 306 struct sshkey *prv; 307 int r; 308 309 if (commentp != NULL) 310 *commentp = NULL; 311 if ((r = sshkey_load_private(filename, "", &prv, commentp)) == 0) 312 return prv; 313 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 314 fatal_r(r, "Load key \"%s\"", filename); 315 if (identity_passphrase) 316 pass = xstrdup(identity_passphrase); 317 else 318 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN); 319 r = sshkey_load_private(filename, pass, &prv, commentp); 320 freezero(pass, strlen(pass)); 321 if (r != 0) 322 fatal_r(r, "Load key \"%s\"", filename); 323 return prv; 324 } 325 326 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 327 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 328 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 329 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 330 331 #ifdef WITH_OPENSSL 332 static void 333 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k) 334 { 335 struct sshbuf *b; 336 char comment[61], *b64; 337 int r; 338 339 if ((b = sshbuf_new()) == NULL) 340 fatal_f("sshbuf_new failed"); 341 if ((r = sshkey_putb(k, b)) != 0) 342 fatal_fr(r, "put key"); 343 if ((b64 = sshbuf_dtob64_string(b, 1)) == NULL) 344 fatal_f("sshbuf_dtob64_string failed"); 345 346 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 347 snprintf(comment, sizeof(comment), 348 "%u-bit %s, converted by %s@%s from OpenSSH", 349 sshkey_size(k), sshkey_type(k), 350 pw->pw_name, hostname); 351 352 sshkey_free(k); 353 sshbuf_free(b); 354 355 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 356 fprintf(stdout, "Comment: \"%s\"\n%s", comment, b64); 357 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 358 free(b64); 359 exit(0); 360 } 361 362 static void 363 do_convert_to_pkcs8(struct sshkey *k) 364 { 365 switch (sshkey_type_plain(k->type)) { 366 case KEY_RSA: 367 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 368 fatal("PEM_write_RSA_PUBKEY failed"); 369 break; 370 case KEY_DSA: 371 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 372 fatal("PEM_write_DSA_PUBKEY failed"); 373 break; 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 case KEY_DSA: 393 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 394 fatal("PEM_write_DSA_PUBKEY failed"); 395 break; 396 case KEY_ECDSA: 397 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 398 fatal("PEM_write_EC_PUBKEY failed"); 399 break; 400 default: 401 fatal_f("unsupported key type %s", sshkey_type(k)); 402 } 403 exit(0); 404 } 405 406 static void 407 do_convert_to(struct passwd *pw) 408 { 409 struct sshkey *k; 410 struct stat st; 411 int r; 412 413 if (!have_identity) 414 ask_filename(pw, "Enter file in which the key is"); 415 if (stat(identity_file, &st) == -1) 416 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 417 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0) 418 k = load_identity(identity_file, NULL); 419 switch (convert_format) { 420 case FMT_RFC4716: 421 do_convert_to_ssh2(pw, k); 422 break; 423 case FMT_PKCS8: 424 do_convert_to_pkcs8(k); 425 break; 426 case FMT_PEM: 427 do_convert_to_pem(k); 428 break; 429 default: 430 fatal_f("unknown key format %d", convert_format); 431 } 432 exit(0); 433 } 434 435 /* 436 * This is almost exactly the bignum1 encoding, but with 32 bit for length 437 * instead of 16. 438 */ 439 static void 440 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value) 441 { 442 u_int bytes, bignum_bits; 443 int r; 444 445 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0) 446 fatal_fr(r, "parse"); 447 bytes = (bignum_bits + 7) / 8; 448 if (sshbuf_len(b) < bytes) 449 fatal_f("input buffer too small: need %d have %zu", 450 bytes, sshbuf_len(b)); 451 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL) 452 fatal_f("BN_bin2bn failed"); 453 if ((r = sshbuf_consume(b, bytes)) != 0) 454 fatal_fr(r, "consume"); 455 } 456 457 static struct sshkey * 458 do_convert_private_ssh2(struct sshbuf *b) 459 { 460 struct sshkey *key = NULL; 461 char *type, *cipher; 462 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345"; 463 int r, rlen, ktype; 464 u_int magic, i1, i2, i3, i4; 465 size_t slen; 466 u_long e; 467 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL; 468 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL; 469 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL; 470 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL; 471 472 if ((r = sshbuf_get_u32(b, &magic)) != 0) 473 fatal_fr(r, "parse magic"); 474 475 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 476 error("bad magic 0x%x != 0x%x", magic, 477 SSH_COM_PRIVATE_KEY_MAGIC); 478 return NULL; 479 } 480 if ((r = sshbuf_get_u32(b, &i1)) != 0 || 481 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 482 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 || 483 (r = sshbuf_get_u32(b, &i2)) != 0 || 484 (r = sshbuf_get_u32(b, &i3)) != 0 || 485 (r = sshbuf_get_u32(b, &i4)) != 0) 486 fatal_fr(r, "parse"); 487 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 488 if (strcmp(cipher, "none") != 0) { 489 error("unsupported cipher %s", cipher); 490 free(cipher); 491 free(type); 492 return NULL; 493 } 494 free(cipher); 495 496 if (strstr(type, "dsa")) { 497 ktype = KEY_DSA; 498 } else if (strstr(type, "rsa")) { 499 ktype = KEY_RSA; 500 } else { 501 free(type); 502 return NULL; 503 } 504 if ((key = sshkey_new(ktype)) == NULL) 505 fatal("sshkey_new failed"); 506 free(type); 507 508 switch (key->type) { 509 case KEY_DSA: 510 if ((dsa_p = BN_new()) == NULL || 511 (dsa_q = BN_new()) == NULL || 512 (dsa_g = BN_new()) == NULL || 513 (dsa_pub_key = BN_new()) == NULL || 514 (dsa_priv_key = BN_new()) == NULL) 515 fatal_f("BN_new"); 516 buffer_get_bignum_bits(b, dsa_p); 517 buffer_get_bignum_bits(b, dsa_g); 518 buffer_get_bignum_bits(b, dsa_q); 519 buffer_get_bignum_bits(b, dsa_pub_key); 520 buffer_get_bignum_bits(b, dsa_priv_key); 521 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) 522 fatal_f("DSA_set0_pqg failed"); 523 dsa_p = dsa_q = dsa_g = NULL; /* transferred */ 524 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key)) 525 fatal_f("DSA_set0_key failed"); 526 dsa_pub_key = dsa_priv_key = NULL; /* transferred */ 527 break; 528 case KEY_RSA: 529 if ((r = sshbuf_get_u8(b, &e1)) != 0 || 530 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) || 531 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0)) 532 fatal_fr(r, "parse RSA"); 533 e = e1; 534 debug("e %lx", e); 535 if (e < 30) { 536 e <<= 8; 537 e += e2; 538 debug("e %lx", e); 539 e <<= 8; 540 e += e3; 541 debug("e %lx", e); 542 } 543 if ((rsa_e = BN_new()) == NULL) 544 fatal_f("BN_new"); 545 if (!BN_set_word(rsa_e, e)) { 546 BN_clear_free(rsa_e); 547 sshkey_free(key); 548 return NULL; 549 } 550 if ((rsa_n = BN_new()) == NULL || 551 (rsa_d = BN_new()) == NULL || 552 (rsa_p = BN_new()) == NULL || 553 (rsa_q = BN_new()) == NULL || 554 (rsa_iqmp = BN_new()) == NULL) 555 fatal_f("BN_new"); 556 buffer_get_bignum_bits(b, rsa_d); 557 buffer_get_bignum_bits(b, rsa_n); 558 buffer_get_bignum_bits(b, rsa_iqmp); 559 buffer_get_bignum_bits(b, rsa_q); 560 buffer_get_bignum_bits(b, rsa_p); 561 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d)) 562 fatal_f("RSA_set0_key failed"); 563 rsa_n = rsa_e = rsa_d = NULL; /* transferred */ 564 if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q)) 565 fatal_f("RSA_set0_factors failed"); 566 rsa_p = rsa_q = NULL; /* transferred */ 567 if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0) 568 fatal_fr(r, "generate RSA parameters"); 569 BN_clear_free(rsa_iqmp); 570 break; 571 } 572 rlen = sshbuf_len(b); 573 if (rlen != 0) 574 error_f("remaining bytes in key blob %d", rlen); 575 576 /* try the key */ 577 if (sshkey_sign(key, &sig, &slen, data, sizeof(data), 578 NULL, NULL, NULL, 0) != 0 || 579 sshkey_verify(key, sig, slen, data, sizeof(data), 580 NULL, 0, NULL) != 0) { 581 sshkey_free(key); 582 free(sig); 583 return NULL; 584 } 585 free(sig); 586 return key; 587 } 588 589 static int 590 get_line(FILE *fp, char *line, size_t len) 591 { 592 int c; 593 size_t pos = 0; 594 595 line[0] = '\0'; 596 while ((c = fgetc(fp)) != EOF) { 597 if (pos >= len - 1) 598 fatal("input line too long."); 599 switch (c) { 600 case '\r': 601 c = fgetc(fp); 602 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) 603 fatal("unget: %s", strerror(errno)); 604 return pos; 605 case '\n': 606 return pos; 607 } 608 line[pos++] = c; 609 line[pos] = '\0'; 610 } 611 /* We reached EOF */ 612 return -1; 613 } 614 615 static void 616 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private) 617 { 618 int r, blen, escaped = 0; 619 u_int len; 620 char line[1024]; 621 struct sshbuf *buf; 622 char encoded[8096]; 623 FILE *fp; 624 625 if ((buf = sshbuf_new()) == NULL) 626 fatal("sshbuf_new failed"); 627 if ((fp = fopen(identity_file, "r")) == NULL) 628 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 629 encoded[0] = '\0'; 630 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 631 if (blen > 0 && line[blen - 1] == '\\') 632 escaped++; 633 if (strncmp(line, "----", 4) == 0 || 634 strstr(line, ": ") != NULL) { 635 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 636 *private = 1; 637 if (strstr(line, " END ") != NULL) { 638 break; 639 } 640 /* fprintf(stderr, "ignore: %s", line); */ 641 continue; 642 } 643 if (escaped) { 644 escaped--; 645 /* fprintf(stderr, "escaped: %s", line); */ 646 continue; 647 } 648 strlcat(encoded, line, sizeof(encoded)); 649 } 650 len = strlen(encoded); 651 if (((len % 4) == 3) && 652 (encoded[len-1] == '=') && 653 (encoded[len-2] == '=') && 654 (encoded[len-3] == '=')) 655 encoded[len-3] = '\0'; 656 if ((r = sshbuf_b64tod(buf, encoded)) != 0) 657 fatal_fr(r, "base64 decode"); 658 if (*private) { 659 if ((*k = do_convert_private_ssh2(buf)) == NULL) 660 fatal_f("private key conversion failed"); 661 } else if ((r = sshkey_fromb(buf, k)) != 0) 662 fatal_fr(r, "parse key"); 663 sshbuf_free(buf); 664 fclose(fp); 665 } 666 667 static void 668 do_convert_from_pkcs8(struct sshkey **k, int *private) 669 { 670 EVP_PKEY *pubkey; 671 FILE *fp; 672 673 if ((fp = fopen(identity_file, "r")) == NULL) 674 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 675 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 676 fatal_f("%s is not a recognised public key format", 677 identity_file); 678 } 679 fclose(fp); 680 switch (EVP_PKEY_base_id(pubkey)) { 681 case EVP_PKEY_RSA: 682 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 683 fatal("sshkey_new failed"); 684 (*k)->type = KEY_RSA; 685 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 686 break; 687 case EVP_PKEY_DSA: 688 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 689 fatal("sshkey_new failed"); 690 (*k)->type = KEY_DSA; 691 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 692 break; 693 case EVP_PKEY_EC: 694 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 695 fatal("sshkey_new failed"); 696 (*k)->type = KEY_ECDSA; 697 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 698 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa); 699 break; 700 default: 701 fatal_f("unsupported pubkey type %d", 702 EVP_PKEY_base_id(pubkey)); 703 } 704 EVP_PKEY_free(pubkey); 705 return; 706 } 707 708 static void 709 do_convert_from_pem(struct sshkey **k, int *private) 710 { 711 FILE *fp; 712 RSA *rsa; 713 714 if ((fp = fopen(identity_file, "r")) == NULL) 715 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 716 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 717 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 718 fatal("sshkey_new failed"); 719 (*k)->type = KEY_RSA; 720 (*k)->rsa = rsa; 721 fclose(fp); 722 return; 723 } 724 fatal_f("unrecognised raw private key format"); 725 } 726 727 static void 728 do_convert_from(struct passwd *pw) 729 { 730 struct sshkey *k = NULL; 731 int r, private = 0, ok = 0; 732 struct stat st; 733 734 if (!have_identity) 735 ask_filename(pw, "Enter file in which the key is"); 736 if (stat(identity_file, &st) == -1) 737 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 738 739 switch (convert_format) { 740 case FMT_RFC4716: 741 do_convert_from_ssh2(pw, &k, &private); 742 break; 743 case FMT_PKCS8: 744 do_convert_from_pkcs8(&k, &private); 745 break; 746 case FMT_PEM: 747 do_convert_from_pem(&k, &private); 748 break; 749 default: 750 fatal_f("unknown key format %d", convert_format); 751 } 752 753 if (!private) { 754 if ((r = sshkey_write(k, stdout)) == 0) 755 ok = 1; 756 if (ok) 757 fprintf(stdout, "\n"); 758 } else { 759 switch (k->type) { 760 case KEY_DSA: 761 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 762 NULL, 0, NULL, NULL); 763 break; 764 case KEY_ECDSA: 765 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 766 NULL, 0, NULL, NULL); 767 break; 768 case KEY_RSA: 769 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 770 NULL, 0, NULL, NULL); 771 break; 772 default: 773 fatal_f("unsupported key type %s", sshkey_type(k)); 774 } 775 } 776 777 if (!ok) 778 fatal("key write failed"); 779 sshkey_free(k); 780 exit(0); 781 } 782 #endif 783 784 static void 785 do_print_public(struct passwd *pw) 786 { 787 struct sshkey *prv; 788 struct stat st; 789 int r; 790 char *comment = NULL; 791 792 if (!have_identity) 793 ask_filename(pw, "Enter file in which the key is"); 794 if (stat(identity_file, &st) == -1) 795 fatal("%s: %s", identity_file, strerror(errno)); 796 prv = load_identity(identity_file, &comment); 797 if ((r = sshkey_write(prv, stdout)) != 0) 798 fatal_fr(r, "write key"); 799 if (comment != NULL && *comment != '\0') 800 fprintf(stdout, " %s", comment); 801 fprintf(stdout, "\n"); 802 if (sshkey_is_sk(prv)) { 803 debug("sk_application: \"%s\", sk_flags 0x%02x", 804 prv->sk_application, prv->sk_flags); 805 } 806 sshkey_free(prv); 807 free(comment); 808 exit(0); 809 } 810 811 static void 812 do_download(struct passwd *pw) 813 { 814 #ifdef ENABLE_PKCS11 815 struct sshkey **keys = NULL; 816 int i, nkeys; 817 enum sshkey_fp_rep rep; 818 int fptype; 819 char *fp, *ra, **comments = NULL; 820 821 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 822 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 823 824 pkcs11_init(1); 825 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys, &comments); 826 if (nkeys <= 0) 827 fatal("cannot read public key from pkcs11"); 828 for (i = 0; i < nkeys; i++) { 829 if (print_fingerprint) { 830 fp = sshkey_fingerprint(keys[i], fptype, rep); 831 ra = sshkey_fingerprint(keys[i], fingerprint_hash, 832 SSH_FP_RANDOMART); 833 if (fp == NULL || ra == NULL) 834 fatal_f("sshkey_fingerprint fail"); 835 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]), 836 fp, sshkey_type(keys[i])); 837 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 838 printf("%s\n", ra); 839 free(ra); 840 free(fp); 841 } else { 842 (void) sshkey_write(keys[i], stdout); /* XXX check */ 843 fprintf(stdout, "%s%s\n", 844 *(comments[i]) == '\0' ? "" : " ", comments[i]); 845 } 846 free(comments[i]); 847 sshkey_free(keys[i]); 848 } 849 free(comments); 850 free(keys); 851 pkcs11_terminate(); 852 exit(0); 853 #else 854 fatal("no pkcs11 support"); 855 #endif /* ENABLE_PKCS11 */ 856 } 857 858 static struct sshkey * 859 try_read_key(char **cpp) 860 { 861 struct sshkey *ret; 862 int r; 863 864 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL) 865 fatal("sshkey_new failed"); 866 if ((r = sshkey_read(ret, cpp)) == 0) 867 return ret; 868 /* Not a key */ 869 sshkey_free(ret); 870 return NULL; 871 } 872 873 static void 874 fingerprint_one_key(const struct sshkey *public, const char *comment) 875 { 876 char *fp = NULL, *ra = NULL; 877 enum sshkey_fp_rep rep; 878 int fptype; 879 880 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 881 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 882 fp = sshkey_fingerprint(public, fptype, rep); 883 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART); 884 if (fp == NULL || ra == NULL) 885 fatal_f("sshkey_fingerprint failed"); 886 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp, 887 comment ? comment : "no comment", sshkey_type(public)); 888 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 889 printf("%s\n", ra); 890 free(ra); 891 free(fp); 892 } 893 894 static void 895 fingerprint_private(const char *path) 896 { 897 struct stat st; 898 char *comment = NULL; 899 struct sshkey *privkey = NULL, *pubkey = NULL; 900 int r; 901 902 if (stat(identity_file, &st) == -1) 903 fatal("%s: %s", path, strerror(errno)); 904 if ((r = sshkey_load_public(path, &pubkey, &comment)) != 0) 905 debug_r(r, "load public \"%s\"", path); 906 if (pubkey == NULL || comment == NULL || *comment == '\0') { 907 free(comment); 908 if ((r = sshkey_load_private(path, NULL, 909 &privkey, &comment)) != 0) 910 debug_r(r, "load private \"%s\"", path); 911 } 912 if (pubkey == NULL && privkey == NULL) 913 fatal("%s is not a key file.", path); 914 915 fingerprint_one_key(pubkey == NULL ? privkey : pubkey, comment); 916 sshkey_free(pubkey); 917 sshkey_free(privkey); 918 free(comment); 919 } 920 921 static void 922 do_fingerprint(struct passwd *pw) 923 { 924 FILE *f; 925 struct sshkey *public = NULL; 926 char *comment = NULL, *cp, *ep, *line = NULL; 927 size_t linesize = 0; 928 int i, invalid = 1; 929 const char *path; 930 u_long lnum = 0; 931 932 if (!have_identity) 933 ask_filename(pw, "Enter file in which the key is"); 934 path = identity_file; 935 936 if (strcmp(identity_file, "-") == 0) { 937 f = stdin; 938 path = "(stdin)"; 939 } else if ((f = fopen(path, "r")) == NULL) 940 fatal("%s: %s: %s", __progname, path, strerror(errno)); 941 942 while (getline(&line, &linesize, f) != -1) { 943 lnum++; 944 cp = line; 945 cp[strcspn(cp, "\n")] = '\0'; 946 /* Trim leading space and comments */ 947 cp = line + strspn(line, " \t"); 948 if (*cp == '#' || *cp == '\0') 949 continue; 950 951 /* 952 * Input may be plain keys, private keys, authorized_keys 953 * or known_hosts. 954 */ 955 956 /* 957 * Try private keys first. Assume a key is private if 958 * "SSH PRIVATE KEY" appears on the first line and we're 959 * not reading from stdin (XXX support private keys on stdin). 960 */ 961 if (lnum == 1 && strcmp(identity_file, "-") != 0 && 962 strstr(cp, "PRIVATE KEY") != NULL) { 963 free(line); 964 fclose(f); 965 fingerprint_private(path); 966 exit(0); 967 } 968 969 /* 970 * If it's not a private key, then this must be prepared to 971 * accept a public key prefixed with a hostname or options. 972 * Try a bare key first, otherwise skip the leading stuff. 973 */ 974 if ((public = try_read_key(&cp)) == NULL) { 975 i = strtol(cp, &ep, 10); 976 if (i == 0 || ep == NULL || 977 (*ep != ' ' && *ep != '\t')) { 978 int quoted = 0; 979 980 comment = cp; 981 for (; *cp && (quoted || (*cp != ' ' && 982 *cp != '\t')); cp++) { 983 if (*cp == '\\' && cp[1] == '"') 984 cp++; /* Skip both */ 985 else if (*cp == '"') 986 quoted = !quoted; 987 } 988 if (!*cp) 989 continue; 990 *cp++ = '\0'; 991 } 992 } 993 /* Retry after parsing leading hostname/key options */ 994 if (public == NULL && (public = try_read_key(&cp)) == NULL) { 995 debug("%s:%lu: not a public key", path, lnum); 996 continue; 997 } 998 999 /* Find trailing comment, if any */ 1000 for (; *cp == ' ' || *cp == '\t'; cp++) 1001 ; 1002 if (*cp != '\0' && *cp != '#') 1003 comment = cp; 1004 1005 fingerprint_one_key(public, comment); 1006 sshkey_free(public); 1007 invalid = 0; /* One good key in the file is sufficient */ 1008 } 1009 fclose(f); 1010 free(line); 1011 1012 if (invalid) 1013 fatal("%s is not a public key file.", path); 1014 exit(0); 1015 } 1016 1017 static void 1018 do_gen_all_hostkeys(struct passwd *pw) 1019 { 1020 struct { 1021 char *key_type; 1022 char *key_type_display; 1023 char *path; 1024 } key_types[] = { 1025 #ifdef WITH_OPENSSL 1026 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 1027 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 1028 #endif /* WITH_OPENSSL */ 1029 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE }, 1030 #ifdef WITH_XMSS 1031 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE }, 1032 #endif /* WITH_XMSS */ 1033 { NULL, NULL, NULL } 1034 }; 1035 1036 u_int32_t bits = 0; 1037 int first = 0; 1038 struct stat st; 1039 struct sshkey *private, *public; 1040 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file; 1041 int i, type, fd, r; 1042 1043 for (i = 0; key_types[i].key_type; i++) { 1044 public = private = NULL; 1045 prv_tmp = pub_tmp = prv_file = pub_file = NULL; 1046 1047 xasprintf(&prv_file, "%s%s", 1048 identity_file, key_types[i].path); 1049 1050 /* Check whether private key exists and is not zero-length */ 1051 if (stat(prv_file, &st) == 0) { 1052 if (st.st_size != 0) 1053 goto next; 1054 } else if (errno != ENOENT) { 1055 error("Could not stat %s: %s", key_types[i].path, 1056 strerror(errno)); 1057 goto failnext; 1058 } 1059 1060 /* 1061 * Private key doesn't exist or is invalid; proceed with 1062 * key generation. 1063 */ 1064 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX", 1065 identity_file, key_types[i].path); 1066 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX", 1067 identity_file, key_types[i].path); 1068 xasprintf(&pub_file, "%s%s.pub", 1069 identity_file, key_types[i].path); 1070 1071 if (first == 0) { 1072 first = 1; 1073 printf("%s: generating new host keys: ", __progname); 1074 } 1075 printf("%s ", key_types[i].key_type_display); 1076 fflush(stdout); 1077 type = sshkey_type_from_name(key_types[i].key_type); 1078 if ((fd = mkstemp(prv_tmp)) == -1) { 1079 error("Could not save your private key in %s: %s", 1080 prv_tmp, strerror(errno)); 1081 goto failnext; 1082 } 1083 (void)close(fd); /* just using mkstemp() to reserve a name */ 1084 bits = 0; 1085 type_bits_valid(type, NULL, &bits); 1086 if ((r = sshkey_generate(type, bits, &private)) != 0) { 1087 error_r(r, "sshkey_generate failed"); 1088 goto failnext; 1089 } 1090 if ((r = sshkey_from_private(private, &public)) != 0) 1091 fatal_fr(r, "sshkey_from_private"); 1092 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 1093 hostname); 1094 if ((r = sshkey_save_private(private, prv_tmp, "", 1095 comment, private_key_format, openssh_format_cipher, 1096 rounds)) != 0) { 1097 error_r(r, "Saving key \"%s\" failed", prv_tmp); 1098 goto failnext; 1099 } 1100 if ((fd = mkstemp(pub_tmp)) == -1) { 1101 error("Could not save your public key in %s: %s", 1102 pub_tmp, strerror(errno)); 1103 goto failnext; 1104 } 1105 (void)fchmod(fd, 0644); 1106 (void)close(fd); 1107 if ((r = sshkey_save_public(public, pub_tmp, comment)) != 0) { 1108 error_r(r, "Unable to save public key to %s", 1109 identity_file); 1110 goto failnext; 1111 } 1112 1113 /* Rename temporary files to their permanent locations. */ 1114 if (rename(pub_tmp, pub_file) != 0) { 1115 error("Unable to move %s into position: %s", 1116 pub_file, strerror(errno)); 1117 goto failnext; 1118 } 1119 if (rename(prv_tmp, prv_file) != 0) { 1120 error("Unable to move %s into position: %s", 1121 key_types[i].path, strerror(errno)); 1122 failnext: 1123 first = 0; 1124 goto next; 1125 } 1126 next: 1127 sshkey_free(private); 1128 sshkey_free(public); 1129 free(prv_tmp); 1130 free(pub_tmp); 1131 free(prv_file); 1132 free(pub_file); 1133 } 1134 if (first != 0) 1135 printf("\n"); 1136 } 1137 1138 struct known_hosts_ctx { 1139 const char *host; /* Hostname searched for in find/delete case */ 1140 FILE *out; /* Output file, stdout for find_hosts case */ 1141 int has_unhashed; /* When hashing, original had unhashed hosts */ 1142 int found_key; /* For find/delete, host was found */ 1143 int invalid; /* File contained invalid items; don't delete */ 1144 int hash_hosts; /* Hash hostnames as we go */ 1145 int find_host; /* Search for specific hostname */ 1146 int delete_host; /* Delete host from known_hosts */ 1147 }; 1148 1149 static int 1150 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx) 1151 { 1152 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1153 char *hashed, *cp, *hosts, *ohosts; 1154 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts); 1155 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM; 1156 1157 switch (l->status) { 1158 case HKF_STATUS_OK: 1159 case HKF_STATUS_MATCHED: 1160 /* 1161 * Don't hash hosts already already hashed, with wildcard 1162 * characters or a CA/revocation marker. 1163 */ 1164 if (was_hashed || has_wild || l->marker != MRK_NONE) { 1165 fprintf(ctx->out, "%s\n", l->line); 1166 if (has_wild && !ctx->find_host) { 1167 logit("%s:%lu: ignoring host name " 1168 "with wildcard: %.64s", l->path, 1169 l->linenum, l->hosts); 1170 } 1171 return 0; 1172 } 1173 /* 1174 * Split any comma-separated hostnames from the host list, 1175 * hash and store separately. 1176 */ 1177 ohosts = hosts = xstrdup(l->hosts); 1178 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') { 1179 lowercase(cp); 1180 if ((hashed = host_hash(cp, NULL, 0)) == NULL) 1181 fatal("hash_host failed"); 1182 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey); 1183 free(hashed); 1184 ctx->has_unhashed = 1; 1185 } 1186 free(ohosts); 1187 return 0; 1188 case HKF_STATUS_INVALID: 1189 /* Retain invalid lines, but mark file as invalid. */ 1190 ctx->invalid = 1; 1191 logit("%s:%lu: invalid line", l->path, l->linenum); 1192 /* FALLTHROUGH */ 1193 default: 1194 fprintf(ctx->out, "%s\n", l->line); 1195 return 0; 1196 } 1197 /* NOTREACHED */ 1198 return -1; 1199 } 1200 1201 static int 1202 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx) 1203 { 1204 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1205 enum sshkey_fp_rep rep; 1206 int fptype; 1207 char *fp = NULL, *ra = NULL; 1208 1209 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 1210 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 1211 1212 if (l->status == HKF_STATUS_MATCHED) { 1213 if (ctx->delete_host) { 1214 if (l->marker != MRK_NONE) { 1215 /* Don't remove CA and revocation lines */ 1216 fprintf(ctx->out, "%s\n", l->line); 1217 } else { 1218 /* 1219 * Hostname matches and has no CA/revoke 1220 * marker, delete it by *not* writing the 1221 * line to ctx->out. 1222 */ 1223 ctx->found_key = 1; 1224 if (!quiet) 1225 printf("# Host %s found: line %lu\n", 1226 ctx->host, l->linenum); 1227 } 1228 return 0; 1229 } else if (ctx->find_host) { 1230 ctx->found_key = 1; 1231 if (!quiet) { 1232 printf("# Host %s found: line %lu %s\n", 1233 ctx->host, 1234 l->linenum, l->marker == MRK_CA ? "CA" : 1235 (l->marker == MRK_REVOKE ? "REVOKED" : "")); 1236 } 1237 if (ctx->hash_hosts) 1238 known_hosts_hash(l, ctx); 1239 else if (print_fingerprint) { 1240 fp = sshkey_fingerprint(l->key, fptype, rep); 1241 ra = sshkey_fingerprint(l->key, 1242 fingerprint_hash, SSH_FP_RANDOMART); 1243 if (fp == NULL || ra == NULL) 1244 fatal_f("sshkey_fingerprint failed"); 1245 mprintf("%s %s %s%s%s\n", ctx->host, 1246 sshkey_type(l->key), fp, 1247 l->comment[0] ? " " : "", 1248 l->comment); 1249 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 1250 printf("%s\n", ra); 1251 free(ra); 1252 free(fp); 1253 } else 1254 fprintf(ctx->out, "%s\n", l->line); 1255 return 0; 1256 } 1257 } else if (ctx->delete_host) { 1258 /* Retain non-matching hosts when deleting */ 1259 if (l->status == HKF_STATUS_INVALID) { 1260 ctx->invalid = 1; 1261 logit("%s:%lu: invalid line", l->path, l->linenum); 1262 } 1263 fprintf(ctx->out, "%s\n", l->line); 1264 } 1265 return 0; 1266 } 1267 1268 static void 1269 do_known_hosts(struct passwd *pw, const char *name, int find_host, 1270 int delete_host, int hash_hosts) 1271 { 1272 char *cp, tmp[PATH_MAX], old[PATH_MAX]; 1273 int r, fd, oerrno, inplace = 0; 1274 struct known_hosts_ctx ctx; 1275 u_int foreach_options; 1276 struct stat sb; 1277 1278 if (!have_identity) { 1279 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1280 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1281 sizeof(identity_file)) 1282 fatal("Specified known hosts path too long"); 1283 free(cp); 1284 have_identity = 1; 1285 } 1286 if (stat(identity_file, &sb) != 0) 1287 fatal("Cannot stat %s: %s", identity_file, strerror(errno)); 1288 1289 memset(&ctx, 0, sizeof(ctx)); 1290 ctx.out = stdout; 1291 ctx.host = name; 1292 ctx.hash_hosts = hash_hosts; 1293 ctx.find_host = find_host; 1294 ctx.delete_host = delete_host; 1295 1296 /* 1297 * Find hosts goes to stdout, hash and deletions happen in-place 1298 * A corner case is ssh-keygen -HF foo, which should go to stdout 1299 */ 1300 if (!find_host && (hash_hosts || delete_host)) { 1301 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1302 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1303 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1304 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1305 fatal("known_hosts path too long"); 1306 umask(077); 1307 if ((fd = mkstemp(tmp)) == -1) 1308 fatal("mkstemp: %s", strerror(errno)); 1309 if ((ctx.out = fdopen(fd, "w")) == NULL) { 1310 oerrno = errno; 1311 unlink(tmp); 1312 fatal("fdopen: %s", strerror(oerrno)); 1313 } 1314 fchmod(fd, sb.st_mode & 0644); 1315 inplace = 1; 1316 } 1317 /* XXX support identity_file == "-" for stdin */ 1318 foreach_options = find_host ? HKF_WANT_MATCH : 0; 1319 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0; 1320 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ? 1321 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL, 1322 foreach_options, 0)) != 0) { 1323 if (inplace) 1324 unlink(tmp); 1325 fatal_fr(r, "hostkeys_foreach"); 1326 } 1327 1328 if (inplace) 1329 fclose(ctx.out); 1330 1331 if (ctx.invalid) { 1332 error("%s is not a valid known_hosts file.", identity_file); 1333 if (inplace) { 1334 error("Not replacing existing known_hosts " 1335 "file because of errors"); 1336 unlink(tmp); 1337 } 1338 exit(1); 1339 } else if (delete_host && !ctx.found_key) { 1340 logit("Host %s not found in %s", name, identity_file); 1341 if (inplace) 1342 unlink(tmp); 1343 } else if (inplace) { 1344 /* Backup existing file */ 1345 if (unlink(old) == -1 && errno != ENOENT) 1346 fatal("unlink %.100s: %s", old, strerror(errno)); 1347 if (link(identity_file, old) == -1) 1348 fatal("link %.100s to %.100s: %s", identity_file, old, 1349 strerror(errno)); 1350 /* Move new one into place */ 1351 if (rename(tmp, identity_file) == -1) { 1352 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1353 strerror(errno)); 1354 unlink(tmp); 1355 unlink(old); 1356 exit(1); 1357 } 1358 1359 printf("%s updated.\n", identity_file); 1360 printf("Original contents retained as %s\n", old); 1361 if (ctx.has_unhashed) { 1362 logit("WARNING: %s contains unhashed entries", old); 1363 logit("Delete this file to ensure privacy " 1364 "of hostnames"); 1365 } 1366 } 1367 1368 exit (find_host && !ctx.found_key); 1369 } 1370 1371 /* 1372 * Perform changing a passphrase. The argument is the passwd structure 1373 * for the current user. 1374 */ 1375 static void 1376 do_change_passphrase(struct passwd *pw) 1377 { 1378 char *comment; 1379 char *old_passphrase, *passphrase1, *passphrase2; 1380 struct stat st; 1381 struct sshkey *private; 1382 int r; 1383 1384 if (!have_identity) 1385 ask_filename(pw, "Enter file in which the key is"); 1386 if (stat(identity_file, &st) == -1) 1387 fatal("%s: %s", identity_file, strerror(errno)); 1388 /* Try to load the file with empty passphrase. */ 1389 r = sshkey_load_private(identity_file, "", &private, &comment); 1390 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) { 1391 if (identity_passphrase) 1392 old_passphrase = xstrdup(identity_passphrase); 1393 else 1394 old_passphrase = 1395 read_passphrase("Enter old passphrase: ", 1396 RP_ALLOW_STDIN); 1397 r = sshkey_load_private(identity_file, old_passphrase, 1398 &private, &comment); 1399 freezero(old_passphrase, strlen(old_passphrase)); 1400 if (r != 0) 1401 goto badkey; 1402 } else if (r != 0) { 1403 badkey: 1404 fatal_r(r, "Failed to load key %s", identity_file); 1405 } 1406 if (comment) 1407 mprintf("Key has comment '%s'\n", comment); 1408 1409 /* Ask the new passphrase (twice). */ 1410 if (identity_new_passphrase) { 1411 passphrase1 = xstrdup(identity_new_passphrase); 1412 passphrase2 = NULL; 1413 } else { 1414 passphrase1 = 1415 read_passphrase("Enter new passphrase (empty for no " 1416 "passphrase): ", RP_ALLOW_STDIN); 1417 passphrase2 = read_passphrase("Enter same passphrase again: ", 1418 RP_ALLOW_STDIN); 1419 1420 /* Verify that they are the same. */ 1421 if (strcmp(passphrase1, passphrase2) != 0) { 1422 explicit_bzero(passphrase1, strlen(passphrase1)); 1423 explicit_bzero(passphrase2, strlen(passphrase2)); 1424 free(passphrase1); 1425 free(passphrase2); 1426 printf("Pass phrases do not match. Try again.\n"); 1427 exit(1); 1428 } 1429 /* Destroy the other copy. */ 1430 freezero(passphrase2, strlen(passphrase2)); 1431 } 1432 1433 /* Save the file using the new passphrase. */ 1434 if ((r = sshkey_save_private(private, identity_file, passphrase1, 1435 comment, private_key_format, openssh_format_cipher, rounds)) != 0) { 1436 error_r(r, "Saving key \"%s\" failed", identity_file); 1437 freezero(passphrase1, strlen(passphrase1)); 1438 sshkey_free(private); 1439 free(comment); 1440 exit(1); 1441 } 1442 /* Destroy the passphrase and the copy of the key in memory. */ 1443 freezero(passphrase1, strlen(passphrase1)); 1444 sshkey_free(private); /* Destroys contents */ 1445 free(comment); 1446 1447 printf("Your identification has been saved with the new passphrase.\n"); 1448 exit(0); 1449 } 1450 1451 /* 1452 * Print the SSHFP RR. 1453 */ 1454 static int 1455 do_print_resource_record(struct passwd *pw, char *fname, char *hname, 1456 int print_generic) 1457 { 1458 struct sshkey *public; 1459 char *comment = NULL; 1460 struct stat st; 1461 int r; 1462 1463 if (fname == NULL) 1464 fatal_f("no filename"); 1465 if (stat(fname, &st) == -1) { 1466 if (errno == ENOENT) 1467 return 0; 1468 fatal("%s: %s", fname, strerror(errno)); 1469 } 1470 if ((r = sshkey_load_public(fname, &public, &comment)) != 0) 1471 fatal_r(r, "Failed to read v2 public key from \"%s\"", fname); 1472 export_dns_rr(hname, public, stdout, print_generic); 1473 sshkey_free(public); 1474 free(comment); 1475 return 1; 1476 } 1477 1478 /* 1479 * Change the comment of a private key file. 1480 */ 1481 static void 1482 do_change_comment(struct passwd *pw, const char *identity_comment) 1483 { 1484 char new_comment[1024], *comment, *passphrase; 1485 struct sshkey *private; 1486 struct sshkey *public; 1487 struct stat st; 1488 int r; 1489 1490 if (!have_identity) 1491 ask_filename(pw, "Enter file in which the key is"); 1492 if (stat(identity_file, &st) == -1) 1493 fatal("%s: %s", identity_file, strerror(errno)); 1494 if ((r = sshkey_load_private(identity_file, "", 1495 &private, &comment)) == 0) 1496 passphrase = xstrdup(""); 1497 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 1498 fatal_r(r, "Cannot load private key \"%s\"", identity_file); 1499 else { 1500 if (identity_passphrase) 1501 passphrase = xstrdup(identity_passphrase); 1502 else if (identity_new_passphrase) 1503 passphrase = xstrdup(identity_new_passphrase); 1504 else 1505 passphrase = read_passphrase("Enter passphrase: ", 1506 RP_ALLOW_STDIN); 1507 /* Try to load using the passphrase. */ 1508 if ((r = sshkey_load_private(identity_file, passphrase, 1509 &private, &comment)) != 0) { 1510 freezero(passphrase, strlen(passphrase)); 1511 fatal_r(r, "Cannot load private key \"%s\"", 1512 identity_file); 1513 } 1514 } 1515 1516 if (private->type != KEY_ED25519 && private->type != KEY_XMSS && 1517 private_key_format != SSHKEY_PRIVATE_OPENSSH) { 1518 error("Comments are only supported for keys stored in " 1519 "the new format (-o)."); 1520 explicit_bzero(passphrase, strlen(passphrase)); 1521 sshkey_free(private); 1522 exit(1); 1523 } 1524 if (comment) 1525 printf("Old comment: %s\n", comment); 1526 else 1527 printf("No existing comment\n"); 1528 1529 if (identity_comment) { 1530 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1531 } else { 1532 printf("New comment: "); 1533 fflush(stdout); 1534 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1535 explicit_bzero(passphrase, strlen(passphrase)); 1536 sshkey_free(private); 1537 exit(1); 1538 } 1539 new_comment[strcspn(new_comment, "\n")] = '\0'; 1540 } 1541 if (comment != NULL && strcmp(comment, new_comment) == 0) { 1542 printf("No change to comment\n"); 1543 free(passphrase); 1544 sshkey_free(private); 1545 free(comment); 1546 exit(0); 1547 } 1548 1549 /* Save the file using the new passphrase. */ 1550 if ((r = sshkey_save_private(private, identity_file, passphrase, 1551 new_comment, private_key_format, openssh_format_cipher, 1552 rounds)) != 0) { 1553 error_r(r, "Saving key \"%s\" failed", identity_file); 1554 freezero(passphrase, strlen(passphrase)); 1555 sshkey_free(private); 1556 free(comment); 1557 exit(1); 1558 } 1559 freezero(passphrase, strlen(passphrase)); 1560 if ((r = sshkey_from_private(private, &public)) != 0) 1561 fatal_fr(r, "sshkey_from_private"); 1562 sshkey_free(private); 1563 1564 strlcat(identity_file, ".pub", sizeof(identity_file)); 1565 if ((r = sshkey_save_public(public, identity_file, new_comment)) != 0) 1566 fatal_r(r, "Unable to save public key to %s", identity_file); 1567 sshkey_free(public); 1568 free(comment); 1569 1570 if (strlen(new_comment) > 0) 1571 printf("Comment '%s' applied\n", new_comment); 1572 else 1573 printf("Comment removed\n"); 1574 1575 exit(0); 1576 } 1577 1578 static void 1579 cert_ext_add(const char *key, const char *value, int iscrit) 1580 { 1581 cert_ext = xreallocarray(cert_ext, ncert_ext + 1, sizeof(*cert_ext)); 1582 cert_ext[ncert_ext].key = xstrdup(key); 1583 cert_ext[ncert_ext].val = value == NULL ? NULL : xstrdup(value); 1584 cert_ext[ncert_ext].crit = iscrit; 1585 ncert_ext++; 1586 } 1587 1588 /* qsort(3) comparison function for certificate extensions */ 1589 static int 1590 cert_ext_cmp(const void *_a, const void *_b) 1591 { 1592 const struct cert_ext *a = (const struct cert_ext *)_a; 1593 const struct cert_ext *b = (const struct cert_ext *)_b; 1594 int r; 1595 1596 if (a->crit != b->crit) 1597 return (a->crit < b->crit) ? -1 : 1; 1598 if ((r = strcmp(a->key, b->key)) != 0) 1599 return r; 1600 if ((a->val == NULL) != (b->val == NULL)) 1601 return (a->val == NULL) ? -1 : 1; 1602 if (a->val != NULL && (r = strcmp(a->val, b->val)) != 0) 1603 return r; 1604 return 0; 1605 } 1606 1607 #define OPTIONS_CRITICAL 1 1608 #define OPTIONS_EXTENSIONS 2 1609 static void 1610 prepare_options_buf(struct sshbuf *c, int which) 1611 { 1612 struct sshbuf *b; 1613 size_t i; 1614 int r; 1615 const struct cert_ext *ext; 1616 1617 if ((b = sshbuf_new()) == NULL) 1618 fatal_f("sshbuf_new failed"); 1619 sshbuf_reset(c); 1620 for (i = 0; i < ncert_ext; i++) { 1621 ext = &cert_ext[i]; 1622 if ((ext->crit && (which & OPTIONS_EXTENSIONS)) || 1623 (!ext->crit && (which & OPTIONS_CRITICAL))) 1624 continue; 1625 if (ext->val == NULL) { 1626 /* flag option */ 1627 debug3_f("%s", ext->key); 1628 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 || 1629 (r = sshbuf_put_string(c, NULL, 0)) != 0) 1630 fatal_fr(r, "prepare flag"); 1631 } else { 1632 /* key/value option */ 1633 debug3_f("%s=%s", ext->key, ext->val); 1634 sshbuf_reset(b); 1635 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 || 1636 (r = sshbuf_put_cstring(b, ext->val)) != 0 || 1637 (r = sshbuf_put_stringb(c, b)) != 0) 1638 fatal_fr(r, "prepare k/v"); 1639 } 1640 } 1641 sshbuf_free(b); 1642 } 1643 1644 static void 1645 finalise_cert_exts(void) 1646 { 1647 /* critical options */ 1648 if (certflags_command != NULL) 1649 cert_ext_add("force-command", certflags_command, 1); 1650 if (certflags_src_addr != NULL) 1651 cert_ext_add("source-address", certflags_src_addr, 1); 1652 if ((certflags_flags & CERTOPT_REQUIRE_VERIFY) != 0) 1653 cert_ext_add("verify-required", NULL, 1); 1654 /* extensions */ 1655 if ((certflags_flags & CERTOPT_X_FWD) != 0) 1656 cert_ext_add("permit-X11-forwarding", NULL, 0); 1657 if ((certflags_flags & CERTOPT_AGENT_FWD) != 0) 1658 cert_ext_add("permit-agent-forwarding", NULL, 0); 1659 if ((certflags_flags & CERTOPT_PORT_FWD) != 0) 1660 cert_ext_add("permit-port-forwarding", NULL, 0); 1661 if ((certflags_flags & CERTOPT_PTY) != 0) 1662 cert_ext_add("permit-pty", NULL, 0); 1663 if ((certflags_flags & CERTOPT_USER_RC) != 0) 1664 cert_ext_add("permit-user-rc", NULL, 0); 1665 if ((certflags_flags & CERTOPT_NO_REQUIRE_USER_PRESENCE) != 0) 1666 cert_ext_add("no-touch-required", NULL, 0); 1667 /* order lexically by key */ 1668 if (ncert_ext > 0) 1669 qsort(cert_ext, ncert_ext, sizeof(*cert_ext), cert_ext_cmp); 1670 } 1671 1672 static struct sshkey * 1673 load_pkcs11_key(char *path) 1674 { 1675 #ifdef ENABLE_PKCS11 1676 struct sshkey **keys = NULL, *public, *private = NULL; 1677 int r, i, nkeys; 1678 1679 if ((r = sshkey_load_public(path, &public, NULL)) != 0) 1680 fatal_r(r, "Couldn't load CA public key \"%s\"", path); 1681 1682 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, 1683 &keys, NULL); 1684 debug3_f("%d keys", nkeys); 1685 if (nkeys <= 0) 1686 fatal("cannot read public key from pkcs11"); 1687 for (i = 0; i < nkeys; i++) { 1688 if (sshkey_equal_public(public, keys[i])) { 1689 private = keys[i]; 1690 continue; 1691 } 1692 sshkey_free(keys[i]); 1693 } 1694 free(keys); 1695 sshkey_free(public); 1696 return private; 1697 #else 1698 fatal("no pkcs11 support"); 1699 #endif /* ENABLE_PKCS11 */ 1700 } 1701 1702 /* Signer for sshkey_certify_custom that uses the agent */ 1703 static int 1704 agent_signer(struct sshkey *key, u_char **sigp, size_t *lenp, 1705 const u_char *data, size_t datalen, 1706 const char *alg, const char *provider, const char *pin, 1707 u_int compat, void *ctx) 1708 { 1709 int *agent_fdp = (int *)ctx; 1710 1711 return ssh_agent_sign(*agent_fdp, key, sigp, lenp, 1712 data, datalen, alg, compat); 1713 } 1714 1715 static void 1716 do_ca_sign(struct passwd *pw, const char *ca_key_path, int prefer_agent, 1717 unsigned long long cert_serial, int cert_serial_autoinc, 1718 int argc, char **argv) 1719 { 1720 int r, i, found, agent_fd = -1; 1721 u_int n; 1722 struct sshkey *ca, *public; 1723 char valid[64], *otmp, *tmp, *cp, *out, *comment; 1724 char *ca_fp = NULL, **plist = NULL, *pin = NULL; 1725 struct ssh_identitylist *agent_ids; 1726 size_t j; 1727 struct notifier_ctx *notifier = NULL; 1728 1729 #ifdef ENABLE_PKCS11 1730 pkcs11_init(1); 1731 #endif 1732 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1733 if (pkcs11provider != NULL) { 1734 /* If a PKCS#11 token was specified then try to use it */ 1735 if ((ca = load_pkcs11_key(tmp)) == NULL) 1736 fatal("No PKCS#11 key matching %s found", ca_key_path); 1737 } else if (prefer_agent) { 1738 /* 1739 * Agent signature requested. Try to use agent after making 1740 * sure the public key specified is actually present in the 1741 * agent. 1742 */ 1743 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 1744 fatal_r(r, "Cannot load CA public key %s", tmp); 1745 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 1746 fatal_r(r, "Cannot use public key for CA signature"); 1747 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0) 1748 fatal_r(r, "Retrieve agent key list"); 1749 found = 0; 1750 for (j = 0; j < agent_ids->nkeys; j++) { 1751 if (sshkey_equal(ca, agent_ids->keys[j])) { 1752 found = 1; 1753 break; 1754 } 1755 } 1756 if (!found) 1757 fatal("CA key %s not found in agent", tmp); 1758 ssh_free_identitylist(agent_ids); 1759 ca->flags |= SSHKEY_FLAG_EXT; 1760 } else { 1761 /* CA key is assumed to be a private key on the filesystem */ 1762 ca = load_identity(tmp, NULL); 1763 if (sshkey_is_sk(ca) && 1764 (ca->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) { 1765 if ((pin = read_passphrase("Enter PIN for CA key: ", 1766 RP_ALLOW_STDIN)) == NULL) 1767 fatal_f("couldn't read PIN"); 1768 } 1769 } 1770 free(tmp); 1771 1772 if (key_type_name != NULL) { 1773 if (sshkey_type_from_name(key_type_name) != ca->type) { 1774 fatal("CA key type %s doesn't match specified %s", 1775 sshkey_ssh_name(ca), key_type_name); 1776 } 1777 } else if (ca->type == KEY_RSA) { 1778 /* Default to a good signature algorithm */ 1779 key_type_name = "rsa-sha2-512"; 1780 } 1781 ca_fp = sshkey_fingerprint(ca, fingerprint_hash, SSH_FP_DEFAULT); 1782 1783 finalise_cert_exts(); 1784 for (i = 0; i < argc; i++) { 1785 /* Split list of principals */ 1786 n = 0; 1787 if (cert_principals != NULL) { 1788 otmp = tmp = xstrdup(cert_principals); 1789 plist = NULL; 1790 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1791 plist = xreallocarray(plist, n + 1, sizeof(*plist)); 1792 if (*(plist[n] = xstrdup(cp)) == '\0') 1793 fatal("Empty principal name"); 1794 } 1795 free(otmp); 1796 } 1797 if (n > SSHKEY_CERT_MAX_PRINCIPALS) 1798 fatal("Too many certificate principals specified"); 1799 1800 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1801 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0) 1802 fatal_r(r, "load pubkey \"%s\"", tmp); 1803 if (sshkey_is_cert(public)) 1804 fatal_f("key \"%s\" type %s cannot be certified", 1805 tmp, sshkey_type(public)); 1806 1807 /* Prepare certificate to sign */ 1808 if ((r = sshkey_to_certified(public)) != 0) 1809 fatal_r(r, "Could not upgrade key %s to certificate", tmp); 1810 public->cert->type = cert_key_type; 1811 public->cert->serial = (u_int64_t)cert_serial; 1812 public->cert->key_id = xstrdup(cert_key_id); 1813 public->cert->nprincipals = n; 1814 public->cert->principals = plist; 1815 public->cert->valid_after = cert_valid_from; 1816 public->cert->valid_before = cert_valid_to; 1817 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL); 1818 prepare_options_buf(public->cert->extensions, 1819 OPTIONS_EXTENSIONS); 1820 if ((r = sshkey_from_private(ca, 1821 &public->cert->signature_key)) != 0) 1822 fatal_r(r, "sshkey_from_private (ca key)"); 1823 1824 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) { 1825 if ((r = sshkey_certify_custom(public, ca, 1826 key_type_name, sk_provider, NULL, agent_signer, 1827 &agent_fd)) != 0) 1828 fatal_r(r, "Couldn't certify %s via agent", tmp); 1829 } else { 1830 if (sshkey_is_sk(ca) && 1831 (ca->sk_flags & SSH_SK_USER_PRESENCE_REQD)) { 1832 notifier = notify_start(0, 1833 "Confirm user presence for key %s %s", 1834 sshkey_type(ca), ca_fp); 1835 } 1836 r = sshkey_certify(public, ca, key_type_name, 1837 sk_provider, pin); 1838 notify_complete(notifier, "User presence confirmed"); 1839 if (r != 0) 1840 fatal_r(r, "Couldn't certify key %s", tmp); 1841 } 1842 1843 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1844 *cp = '\0'; 1845 xasprintf(&out, "%s-cert.pub", tmp); 1846 free(tmp); 1847 1848 if ((r = sshkey_save_public(public, out, comment)) != 0) { 1849 fatal_r(r, "Unable to save public key to %s", 1850 identity_file); 1851 } 1852 1853 if (!quiet) { 1854 sshkey_format_cert_validity(public->cert, 1855 valid, sizeof(valid)); 1856 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1857 "valid %s", sshkey_cert_type(public), 1858 out, public->cert->key_id, 1859 (unsigned long long)public->cert->serial, 1860 cert_principals != NULL ? " for " : "", 1861 cert_principals != NULL ? cert_principals : "", 1862 valid); 1863 } 1864 1865 sshkey_free(public); 1866 free(out); 1867 if (cert_serial_autoinc) 1868 cert_serial++; 1869 } 1870 if (pin != NULL) 1871 freezero(pin, strlen(pin)); 1872 free(ca_fp); 1873 #ifdef ENABLE_PKCS11 1874 pkcs11_terminate(); 1875 #endif 1876 exit(0); 1877 } 1878 1879 static u_int64_t 1880 parse_relative_time(const char *s, time_t now) 1881 { 1882 int64_t mul, secs; 1883 1884 mul = *s == '-' ? -1 : 1; 1885 1886 if ((secs = convtime(s + 1)) == -1) 1887 fatal("Invalid relative certificate time %s", s); 1888 if (mul == -1 && secs > now) 1889 fatal("Certificate time %s cannot be represented", s); 1890 return now + (u_int64_t)(secs * mul); 1891 } 1892 1893 static void 1894 parse_cert_times(char *timespec) 1895 { 1896 char *from, *to; 1897 time_t now = time(NULL); 1898 int64_t secs; 1899 1900 /* +timespec relative to now */ 1901 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1902 if ((secs = convtime(timespec + 1)) == -1) 1903 fatal("Invalid relative certificate life %s", timespec); 1904 cert_valid_to = now + secs; 1905 /* 1906 * Backdate certificate one minute to avoid problems on hosts 1907 * with poorly-synchronised clocks. 1908 */ 1909 cert_valid_from = ((now - 59)/ 60) * 60; 1910 return; 1911 } 1912 1913 /* 1914 * from:to, where 1915 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "always" 1916 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "forever" 1917 */ 1918 from = xstrdup(timespec); 1919 to = strchr(from, ':'); 1920 if (to == NULL || from == to || *(to + 1) == '\0') 1921 fatal("Invalid certificate life specification %s", timespec); 1922 *to++ = '\0'; 1923 1924 if (*from == '-' || *from == '+') 1925 cert_valid_from = parse_relative_time(from, now); 1926 else if (strcmp(from, "always") == 0) 1927 cert_valid_from = 0; 1928 else if (parse_absolute_time(from, &cert_valid_from) != 0) 1929 fatal("Invalid from time \"%s\"", from); 1930 1931 if (*to == '-' || *to == '+') 1932 cert_valid_to = parse_relative_time(to, now); 1933 else if (strcmp(to, "forever") == 0) 1934 cert_valid_to = ~(u_int64_t)0; 1935 else if (parse_absolute_time(to, &cert_valid_to) != 0) 1936 fatal("Invalid to time \"%s\"", to); 1937 1938 if (cert_valid_to <= cert_valid_from) 1939 fatal("Empty certificate validity interval"); 1940 free(from); 1941 } 1942 1943 static void 1944 add_cert_option(char *opt) 1945 { 1946 char *val, *cp; 1947 int iscrit = 0; 1948 1949 if (strcasecmp(opt, "clear") == 0) 1950 certflags_flags = 0; 1951 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1952 certflags_flags &= ~CERTOPT_X_FWD; 1953 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1954 certflags_flags |= CERTOPT_X_FWD; 1955 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1956 certflags_flags &= ~CERTOPT_AGENT_FWD; 1957 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1958 certflags_flags |= CERTOPT_AGENT_FWD; 1959 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1960 certflags_flags &= ~CERTOPT_PORT_FWD; 1961 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1962 certflags_flags |= CERTOPT_PORT_FWD; 1963 else if (strcasecmp(opt, "no-pty") == 0) 1964 certflags_flags &= ~CERTOPT_PTY; 1965 else if (strcasecmp(opt, "permit-pty") == 0) 1966 certflags_flags |= CERTOPT_PTY; 1967 else if (strcasecmp(opt, "no-user-rc") == 0) 1968 certflags_flags &= ~CERTOPT_USER_RC; 1969 else if (strcasecmp(opt, "permit-user-rc") == 0) 1970 certflags_flags |= CERTOPT_USER_RC; 1971 else if (strcasecmp(opt, "touch-required") == 0) 1972 certflags_flags &= ~CERTOPT_NO_REQUIRE_USER_PRESENCE; 1973 else if (strcasecmp(opt, "no-touch-required") == 0) 1974 certflags_flags |= CERTOPT_NO_REQUIRE_USER_PRESENCE; 1975 else if (strcasecmp(opt, "no-verify-required") == 0) 1976 certflags_flags &= ~CERTOPT_REQUIRE_VERIFY; 1977 else if (strcasecmp(opt, "verify-required") == 0) 1978 certflags_flags |= CERTOPT_REQUIRE_VERIFY; 1979 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1980 val = opt + 14; 1981 if (*val == '\0') 1982 fatal("Empty force-command option"); 1983 if (certflags_command != NULL) 1984 fatal("force-command already specified"); 1985 certflags_command = xstrdup(val); 1986 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 1987 val = opt + 15; 1988 if (*val == '\0') 1989 fatal("Empty source-address option"); 1990 if (certflags_src_addr != NULL) 1991 fatal("source-address already specified"); 1992 if (addr_match_cidr_list(NULL, val) != 0) 1993 fatal("Invalid source-address list"); 1994 certflags_src_addr = xstrdup(val); 1995 } else if (strncasecmp(opt, "extension:", 10) == 0 || 1996 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) { 1997 val = xstrdup(strchr(opt, ':') + 1); 1998 if ((cp = strchr(val, '=')) != NULL) 1999 *cp++ = '\0'; 2000 cert_ext_add(val, cp, iscrit); 2001 free(val); 2002 } else 2003 fatal("Unsupported certificate option \"%s\"", opt); 2004 } 2005 2006 static void 2007 show_options(struct sshbuf *optbuf, int in_critical) 2008 { 2009 char *name, *arg, *hex; 2010 struct sshbuf *options, *option = NULL; 2011 int r; 2012 2013 if ((options = sshbuf_fromb(optbuf)) == NULL) 2014 fatal_f("sshbuf_fromb failed"); 2015 while (sshbuf_len(options) != 0) { 2016 sshbuf_free(option); 2017 option = NULL; 2018 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 || 2019 (r = sshbuf_froms(options, &option)) != 0) 2020 fatal_fr(r, "parse option"); 2021 printf(" %s", name); 2022 if (!in_critical && 2023 (strcmp(name, "permit-X11-forwarding") == 0 || 2024 strcmp(name, "permit-agent-forwarding") == 0 || 2025 strcmp(name, "permit-port-forwarding") == 0 || 2026 strcmp(name, "permit-pty") == 0 || 2027 strcmp(name, "permit-user-rc") == 0 || 2028 strcmp(name, "no-touch-required") == 0)) { 2029 printf("\n"); 2030 } else if (in_critical && 2031 (strcmp(name, "force-command") == 0 || 2032 strcmp(name, "source-address") == 0)) { 2033 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0) 2034 fatal_fr(r, "parse critical"); 2035 printf(" %s\n", arg); 2036 free(arg); 2037 } else if (in_critical && 2038 strcmp(name, "verify-required") == 0) { 2039 printf("\n"); 2040 } else if (sshbuf_len(option) > 0) { 2041 hex = sshbuf_dtob16(option); 2042 printf(" UNKNOWN OPTION: %s (len %zu)\n", 2043 hex, sshbuf_len(option)); 2044 sshbuf_reset(option); 2045 free(hex); 2046 } else 2047 printf(" UNKNOWN FLAG OPTION\n"); 2048 free(name); 2049 if (sshbuf_len(option) != 0) 2050 fatal("Option corrupt: extra data at end"); 2051 } 2052 sshbuf_free(option); 2053 sshbuf_free(options); 2054 } 2055 2056 static void 2057 print_cert(struct sshkey *key) 2058 { 2059 char valid[64], *key_fp, *ca_fp; 2060 u_int i; 2061 2062 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT); 2063 ca_fp = sshkey_fingerprint(key->cert->signature_key, 2064 fingerprint_hash, SSH_FP_DEFAULT); 2065 if (key_fp == NULL || ca_fp == NULL) 2066 fatal_f("sshkey_fingerprint fail"); 2067 sshkey_format_cert_validity(key->cert, valid, sizeof(valid)); 2068 2069 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key), 2070 sshkey_cert_type(key)); 2071 printf(" Public key: %s %s\n", sshkey_type(key), key_fp); 2072 printf(" Signing CA: %s %s (using %s)\n", 2073 sshkey_type(key->cert->signature_key), ca_fp, 2074 key->cert->signature_type); 2075 printf(" Key ID: \"%s\"\n", key->cert->key_id); 2076 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial); 2077 printf(" Valid: %s\n", valid); 2078 printf(" Principals: "); 2079 if (key->cert->nprincipals == 0) 2080 printf("(none)\n"); 2081 else { 2082 for (i = 0; i < key->cert->nprincipals; i++) 2083 printf("\n %s", 2084 key->cert->principals[i]); 2085 printf("\n"); 2086 } 2087 printf(" Critical Options: "); 2088 if (sshbuf_len(key->cert->critical) == 0) 2089 printf("(none)\n"); 2090 else { 2091 printf("\n"); 2092 show_options(key->cert->critical, 1); 2093 } 2094 printf(" Extensions: "); 2095 if (sshbuf_len(key->cert->extensions) == 0) 2096 printf("(none)\n"); 2097 else { 2098 printf("\n"); 2099 show_options(key->cert->extensions, 0); 2100 } 2101 } 2102 2103 static void 2104 do_show_cert(struct passwd *pw) 2105 { 2106 struct sshkey *key = NULL; 2107 struct stat st; 2108 int r, is_stdin = 0, ok = 0; 2109 FILE *f; 2110 char *cp, *line = NULL; 2111 const char *path; 2112 size_t linesize = 0; 2113 u_long lnum = 0; 2114 2115 if (!have_identity) 2116 ask_filename(pw, "Enter file in which the key is"); 2117 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) == -1) 2118 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 2119 2120 path = identity_file; 2121 if (strcmp(path, "-") == 0) { 2122 f = stdin; 2123 path = "(stdin)"; 2124 is_stdin = 1; 2125 } else if ((f = fopen(identity_file, "r")) == NULL) 2126 fatal("fopen %s: %s", identity_file, strerror(errno)); 2127 2128 while (getline(&line, &linesize, f) != -1) { 2129 lnum++; 2130 sshkey_free(key); 2131 key = NULL; 2132 /* Trim leading space and comments */ 2133 cp = line + strspn(line, " \t"); 2134 if (*cp == '#' || *cp == '\0') 2135 continue; 2136 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2137 fatal("sshkey_new"); 2138 if ((r = sshkey_read(key, &cp)) != 0) { 2139 error_r(r, "%s:%lu: invalid key", path, lnum); 2140 continue; 2141 } 2142 if (!sshkey_is_cert(key)) { 2143 error("%s:%lu is not a certificate", path, lnum); 2144 continue; 2145 } 2146 ok = 1; 2147 if (!is_stdin && lnum == 1) 2148 printf("%s:\n", path); 2149 else 2150 printf("%s:%lu:\n", path, lnum); 2151 print_cert(key); 2152 } 2153 free(line); 2154 sshkey_free(key); 2155 fclose(f); 2156 exit(ok ? 0 : 1); 2157 } 2158 2159 static void 2160 load_krl(const char *path, struct ssh_krl **krlp) 2161 { 2162 struct sshbuf *krlbuf; 2163 int r; 2164 2165 if ((r = sshbuf_load_file(path, &krlbuf)) != 0) 2166 fatal_r(r, "Unable to load KRL %s", path); 2167 /* XXX check sigs */ 2168 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 || 2169 *krlp == NULL) 2170 fatal_r(r, "Invalid KRL file %s", path); 2171 sshbuf_free(krlbuf); 2172 } 2173 2174 static void 2175 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp, 2176 const char *file, u_long lnum) 2177 { 2178 char *tmp; 2179 size_t tlen; 2180 struct sshbuf *b; 2181 int r; 2182 2183 if (strncmp(cp, "SHA256:", 7) != 0) 2184 fatal("%s:%lu: unsupported hash algorithm", file, lnum); 2185 cp += 7; 2186 2187 /* 2188 * OpenSSH base64 hashes omit trailing '=' 2189 * characters; put them back for decode. 2190 */ 2191 tlen = strlen(cp); 2192 tmp = xmalloc(tlen + 4 + 1); 2193 strlcpy(tmp, cp, tlen + 1); 2194 while ((tlen % 4) != 0) { 2195 tmp[tlen++] = '='; 2196 tmp[tlen] = '\0'; 2197 } 2198 if ((b = sshbuf_new()) == NULL) 2199 fatal_f("sshbuf_new failed"); 2200 if ((r = sshbuf_b64tod(b, tmp)) != 0) 2201 fatal_r(r, "%s:%lu: decode hash failed", file, lnum); 2202 free(tmp); 2203 *lenp = sshbuf_len(b); 2204 *blobp = xmalloc(*lenp); 2205 memcpy(*blobp, sshbuf_ptr(b), *lenp); 2206 sshbuf_free(b); 2207 } 2208 2209 static void 2210 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca, 2211 const struct sshkey *ca, struct ssh_krl *krl) 2212 { 2213 struct sshkey *key = NULL; 2214 u_long lnum = 0; 2215 char *path, *cp, *ep, *line = NULL; 2216 u_char *blob = NULL; 2217 size_t blen = 0, linesize = 0; 2218 unsigned long long serial, serial2; 2219 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r; 2220 FILE *krl_spec; 2221 2222 path = tilde_expand_filename(file, pw->pw_uid); 2223 if (strcmp(path, "-") == 0) { 2224 krl_spec = stdin; 2225 free(path); 2226 path = xstrdup("(standard input)"); 2227 } else if ((krl_spec = fopen(path, "r")) == NULL) 2228 fatal("fopen %s: %s", path, strerror(errno)); 2229 2230 if (!quiet) 2231 printf("Revoking from %s\n", path); 2232 while (getline(&line, &linesize, krl_spec) != -1) { 2233 lnum++; 2234 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0; 2235 cp = line + strspn(line, " \t"); 2236 /* Trim trailing space, comments and strip \n */ 2237 for (i = 0, r = -1; cp[i] != '\0'; i++) { 2238 if (cp[i] == '#' || cp[i] == '\n') { 2239 cp[i] = '\0'; 2240 break; 2241 } 2242 if (cp[i] == ' ' || cp[i] == '\t') { 2243 /* Remember the start of a span of whitespace */ 2244 if (r == -1) 2245 r = i; 2246 } else 2247 r = -1; 2248 } 2249 if (r != -1) 2250 cp[r] = '\0'; 2251 if (*cp == '\0') 2252 continue; 2253 if (strncasecmp(cp, "serial:", 7) == 0) { 2254 if (ca == NULL && !wild_ca) { 2255 fatal("revoking certificates by serial number " 2256 "requires specification of a CA key"); 2257 } 2258 cp += 7; 2259 cp = cp + strspn(cp, " \t"); 2260 errno = 0; 2261 serial = strtoull(cp, &ep, 0); 2262 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 2263 fatal("%s:%lu: invalid serial \"%s\"", 2264 path, lnum, cp); 2265 if (errno == ERANGE && serial == ULLONG_MAX) 2266 fatal("%s:%lu: serial out of range", 2267 path, lnum); 2268 serial2 = serial; 2269 if (*ep == '-') { 2270 cp = ep + 1; 2271 errno = 0; 2272 serial2 = strtoull(cp, &ep, 0); 2273 if (*cp == '\0' || *ep != '\0') 2274 fatal("%s:%lu: invalid serial \"%s\"", 2275 path, lnum, cp); 2276 if (errno == ERANGE && serial2 == ULLONG_MAX) 2277 fatal("%s:%lu: serial out of range", 2278 path, lnum); 2279 if (serial2 <= serial) 2280 fatal("%s:%lu: invalid serial range " 2281 "%llu:%llu", path, lnum, 2282 (unsigned long long)serial, 2283 (unsigned long long)serial2); 2284 } 2285 if (ssh_krl_revoke_cert_by_serial_range(krl, 2286 ca, serial, serial2) != 0) { 2287 fatal_f("revoke serial failed"); 2288 } 2289 } else if (strncasecmp(cp, "id:", 3) == 0) { 2290 if (ca == NULL && !wild_ca) { 2291 fatal("revoking certificates by key ID " 2292 "requires specification of a CA key"); 2293 } 2294 cp += 3; 2295 cp = cp + strspn(cp, " \t"); 2296 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2297 fatal_f("revoke key ID failed"); 2298 } else if (strncasecmp(cp, "hash:", 5) == 0) { 2299 cp += 5; 2300 cp = cp + strspn(cp, " \t"); 2301 hash_to_blob(cp, &blob, &blen, file, lnum); 2302 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2303 if (r != 0) 2304 fatal_fr(r, "revoke key failed"); 2305 } else { 2306 if (strncasecmp(cp, "key:", 4) == 0) { 2307 cp += 4; 2308 cp = cp + strspn(cp, " \t"); 2309 was_explicit_key = 1; 2310 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2311 cp += 5; 2312 cp = cp + strspn(cp, " \t"); 2313 was_sha1 = 1; 2314 } else if (strncasecmp(cp, "sha256:", 7) == 0) { 2315 cp += 7; 2316 cp = cp + strspn(cp, " \t"); 2317 was_sha256 = 1; 2318 /* 2319 * Just try to process the line as a key. 2320 * Parsing will fail if it isn't. 2321 */ 2322 } 2323 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2324 fatal("sshkey_new"); 2325 if ((r = sshkey_read(key, &cp)) != 0) 2326 fatal_r(r, "%s:%lu: invalid key", path, lnum); 2327 if (was_explicit_key) 2328 r = ssh_krl_revoke_key_explicit(krl, key); 2329 else if (was_sha1) { 2330 if (sshkey_fingerprint_raw(key, 2331 SSH_DIGEST_SHA1, &blob, &blen) != 0) { 2332 fatal("%s:%lu: fingerprint failed", 2333 file, lnum); 2334 } 2335 r = ssh_krl_revoke_key_sha1(krl, blob, blen); 2336 } else if (was_sha256) { 2337 if (sshkey_fingerprint_raw(key, 2338 SSH_DIGEST_SHA256, &blob, &blen) != 0) { 2339 fatal("%s:%lu: fingerprint failed", 2340 file, lnum); 2341 } 2342 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2343 } else 2344 r = ssh_krl_revoke_key(krl, key); 2345 if (r != 0) 2346 fatal_fr(r, "revoke key failed"); 2347 freezero(blob, blen); 2348 blob = NULL; 2349 blen = 0; 2350 sshkey_free(key); 2351 } 2352 } 2353 if (strcmp(path, "-") != 0) 2354 fclose(krl_spec); 2355 free(line); 2356 free(path); 2357 } 2358 2359 static void 2360 do_gen_krl(struct passwd *pw, int updating, const char *ca_key_path, 2361 unsigned long long krl_version, const char *krl_comment, 2362 int argc, char **argv) 2363 { 2364 struct ssh_krl *krl; 2365 struct stat sb; 2366 struct sshkey *ca = NULL; 2367 int i, r, wild_ca = 0; 2368 char *tmp; 2369 struct sshbuf *kbuf; 2370 2371 if (*identity_file == '\0') 2372 fatal("KRL generation requires an output file"); 2373 if (stat(identity_file, &sb) == -1) { 2374 if (errno != ENOENT) 2375 fatal("Cannot access KRL \"%s\": %s", 2376 identity_file, strerror(errno)); 2377 if (updating) 2378 fatal("KRL \"%s\" does not exist", identity_file); 2379 } 2380 if (ca_key_path != NULL) { 2381 if (strcasecmp(ca_key_path, "none") == 0) 2382 wild_ca = 1; 2383 else { 2384 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2385 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 2386 fatal_r(r, "Cannot load CA public key %s", tmp); 2387 free(tmp); 2388 } 2389 } 2390 2391 if (updating) 2392 load_krl(identity_file, &krl); 2393 else if ((krl = ssh_krl_init()) == NULL) 2394 fatal("couldn't create KRL"); 2395 2396 if (krl_version != 0) 2397 ssh_krl_set_version(krl, krl_version); 2398 if (krl_comment != NULL) 2399 ssh_krl_set_comment(krl, krl_comment); 2400 2401 for (i = 0; i < argc; i++) 2402 update_krl_from_file(pw, argv[i], wild_ca, ca, krl); 2403 2404 if ((kbuf = sshbuf_new()) == NULL) 2405 fatal("sshbuf_new failed"); 2406 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0) 2407 fatal("Couldn't generate KRL"); 2408 if ((r = sshbuf_write_file(identity_file, kbuf)) != 0) 2409 fatal("write %s: %s", identity_file, strerror(errno)); 2410 sshbuf_free(kbuf); 2411 ssh_krl_free(krl); 2412 sshkey_free(ca); 2413 } 2414 2415 static void 2416 do_check_krl(struct passwd *pw, int print_krl, int argc, char **argv) 2417 { 2418 int i, r, ret = 0; 2419 char *comment; 2420 struct ssh_krl *krl; 2421 struct sshkey *k; 2422 2423 if (*identity_file == '\0') 2424 fatal("KRL checking requires an input file"); 2425 load_krl(identity_file, &krl); 2426 if (print_krl) 2427 krl_dump(krl, stdout); 2428 for (i = 0; i < argc; i++) { 2429 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0) 2430 fatal_r(r, "Cannot load public key %s", argv[i]); 2431 r = ssh_krl_check_key(krl, k); 2432 printf("%s%s%s%s: %s\n", argv[i], 2433 *comment ? " (" : "", comment, *comment ? ")" : "", 2434 r == 0 ? "ok" : "REVOKED"); 2435 if (r != 0) 2436 ret = 1; 2437 sshkey_free(k); 2438 free(comment); 2439 } 2440 ssh_krl_free(krl); 2441 exit(ret); 2442 } 2443 2444 static struct sshkey * 2445 load_sign_key(const char *keypath, const struct sshkey *pubkey) 2446 { 2447 size_t i, slen, plen = strlen(keypath); 2448 char *privpath = xstrdup(keypath); 2449 static const char * const suffixes[] = { "-cert.pub", ".pub", NULL }; 2450 struct sshkey *ret = NULL, *privkey = NULL; 2451 int r, waspub = 0; 2452 struct stat st; 2453 2454 /* 2455 * If passed a public key filename, then try to locate the corresponding 2456 * private key. This lets us specify certificates on the command-line 2457 * and have ssh-keygen find the appropriate private key. 2458 */ 2459 for (i = 0; suffixes[i]; i++) { 2460 slen = strlen(suffixes[i]); 2461 if (plen <= slen || 2462 strcmp(privpath + plen - slen, suffixes[i]) != 0) 2463 continue; 2464 privpath[plen - slen] = '\0'; 2465 debug_f("%s looks like a public key, using private key " 2466 "path %s instead", keypath, privpath); 2467 waspub = 1; 2468 } 2469 if (waspub && stat(privpath, &st) != 0 && errno == ENOENT) 2470 fatal("No private key found for public key \"%s\"", keypath); 2471 if ((r = sshkey_load_private(privpath, "", &privkey, NULL)) != 0 && 2472 (r != SSH_ERR_KEY_WRONG_PASSPHRASE)) { 2473 debug_fr(r, "load private key \"%s\"", privpath); 2474 fatal("No private key found for \"%s\"", privpath); 2475 } else if (privkey == NULL) 2476 privkey = load_identity(privpath, NULL); 2477 2478 if (!sshkey_equal_public(pubkey, privkey)) { 2479 error("Public key %s doesn't match private %s", 2480 keypath, privpath); 2481 goto done; 2482 } 2483 if (sshkey_is_cert(pubkey) && !sshkey_is_cert(privkey)) { 2484 /* 2485 * Graft the certificate onto the private key to make 2486 * it capable of signing. 2487 */ 2488 if ((r = sshkey_to_certified(privkey)) != 0) { 2489 error_fr(r, "sshkey_to_certified"); 2490 goto done; 2491 } 2492 if ((r = sshkey_cert_copy(pubkey, privkey)) != 0) { 2493 error_fr(r, "sshkey_cert_copy"); 2494 goto done; 2495 } 2496 } 2497 /* success */ 2498 ret = privkey; 2499 privkey = NULL; 2500 done: 2501 sshkey_free(privkey); 2502 free(privpath); 2503 return ret; 2504 } 2505 2506 static int 2507 sign_one(struct sshkey *signkey, const char *filename, int fd, 2508 const char *sig_namespace, const char *hashalg, sshsig_signer *signer, 2509 void *signer_ctx) 2510 { 2511 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2512 int r = SSH_ERR_INTERNAL_ERROR, wfd = -1, oerrno; 2513 char *wfile = NULL, *asig = NULL, *fp = NULL; 2514 char *pin = NULL, *prompt = NULL; 2515 2516 if (!quiet) { 2517 if (fd == STDIN_FILENO) 2518 fprintf(stderr, "Signing data on standard input\n"); 2519 else 2520 fprintf(stderr, "Signing file %s\n", filename); 2521 } 2522 if (signer == NULL && sshkey_is_sk(signkey)) { 2523 if ((signkey->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) { 2524 xasprintf(&prompt, "Enter PIN for %s key: ", 2525 sshkey_type(signkey)); 2526 if ((pin = read_passphrase(prompt, 2527 RP_ALLOW_STDIN)) == NULL) 2528 fatal_f("couldn't read PIN"); 2529 } 2530 if ((signkey->sk_flags & SSH_SK_USER_PRESENCE_REQD)) { 2531 if ((fp = sshkey_fingerprint(signkey, fingerprint_hash, 2532 SSH_FP_DEFAULT)) == NULL) 2533 fatal_f("fingerprint failed"); 2534 fprintf(stderr, "Confirm user presence for key %s %s\n", 2535 sshkey_type(signkey), fp); 2536 free(fp); 2537 } 2538 } 2539 if ((r = sshsig_sign_fd(signkey, hashalg, sk_provider, pin, 2540 fd, sig_namespace, &sigbuf, signer, signer_ctx)) != 0) { 2541 error_r(r, "Signing %s failed", filename); 2542 goto out; 2543 } 2544 if ((r = sshsig_armor(sigbuf, &abuf)) != 0) { 2545 error_fr(r, "sshsig_armor"); 2546 goto out; 2547 } 2548 if ((asig = sshbuf_dup_string(abuf)) == NULL) { 2549 error_f("buffer error"); 2550 r = SSH_ERR_ALLOC_FAIL; 2551 goto out; 2552 } 2553 2554 if (fd == STDIN_FILENO) { 2555 fputs(asig, stdout); 2556 fflush(stdout); 2557 } else { 2558 xasprintf(&wfile, "%s.sig", filename); 2559 if (confirm_overwrite(wfile)) { 2560 if ((wfd = open(wfile, O_WRONLY|O_CREAT|O_TRUNC, 2561 0666)) == -1) { 2562 oerrno = errno; 2563 error("Cannot open %s: %s", 2564 wfile, strerror(errno)); 2565 errno = oerrno; 2566 r = SSH_ERR_SYSTEM_ERROR; 2567 goto out; 2568 } 2569 if (atomicio(vwrite, wfd, asig, 2570 strlen(asig)) != strlen(asig)) { 2571 oerrno = errno; 2572 error("Cannot write to %s: %s", 2573 wfile, strerror(errno)); 2574 errno = oerrno; 2575 r = SSH_ERR_SYSTEM_ERROR; 2576 goto out; 2577 } 2578 if (!quiet) { 2579 fprintf(stderr, "Write signature to %s\n", 2580 wfile); 2581 } 2582 } 2583 } 2584 /* success */ 2585 r = 0; 2586 out: 2587 free(wfile); 2588 free(prompt); 2589 free(asig); 2590 if (pin != NULL) 2591 freezero(pin, strlen(pin)); 2592 sshbuf_free(abuf); 2593 sshbuf_free(sigbuf); 2594 if (wfd != -1) 2595 close(wfd); 2596 return r; 2597 } 2598 2599 static int 2600 sig_process_opts(char * const *opts, size_t nopts, char **hashalgp, 2601 uint64_t *verify_timep, int *print_pubkey) 2602 { 2603 size_t i; 2604 time_t now; 2605 2606 if (verify_timep != NULL) 2607 *verify_timep = 0; 2608 if (print_pubkey != NULL) 2609 *print_pubkey = 0; 2610 if (hashalgp != NULL) 2611 *hashalgp = NULL; 2612 for (i = 0; i < nopts; i++) { 2613 if (hashalgp != NULL && 2614 strncasecmp(opts[i], "hashalg=", 8) == 0) { 2615 *hashalgp = xstrdup(opts[i] + 8); 2616 } else if (verify_timep && 2617 strncasecmp(opts[i], "verify-time=", 12) == 0) { 2618 if (parse_absolute_time(opts[i] + 12, 2619 verify_timep) != 0 || *verify_timep == 0) { 2620 error("Invalid \"verify-time\" option"); 2621 return SSH_ERR_INVALID_ARGUMENT; 2622 } 2623 } else if (print_pubkey && 2624 strcasecmp(opts[i], "print-pubkey") == 0) { 2625 *print_pubkey = 1; 2626 } else { 2627 error("Invalid option \"%s\"", opts[i]); 2628 return SSH_ERR_INVALID_ARGUMENT; 2629 } 2630 } 2631 if (verify_timep && *verify_timep == 0) { 2632 if ((now = time(NULL)) < 0) { 2633 error("Time is before epoch"); 2634 return SSH_ERR_INVALID_ARGUMENT; 2635 } 2636 *verify_timep = (uint64_t)now; 2637 } 2638 return 0; 2639 } 2640 2641 2642 static int 2643 sig_sign(const char *keypath, const char *sig_namespace, int require_agent, 2644 int argc, char **argv, char * const *opts, size_t nopts) 2645 { 2646 int i, fd = -1, r, ret = -1; 2647 int agent_fd = -1; 2648 struct sshkey *pubkey = NULL, *privkey = NULL, *signkey = NULL; 2649 sshsig_signer *signer = NULL; 2650 char *hashalg = NULL; 2651 2652 /* Check file arguments. */ 2653 for (i = 0; i < argc; i++) { 2654 if (strcmp(argv[i], "-") != 0) 2655 continue; 2656 if (i > 0 || argc > 1) 2657 fatal("Cannot sign mix of paths and standard input"); 2658 } 2659 2660 if (sig_process_opts(opts, nopts, &hashalg, NULL, NULL) != 0) 2661 goto done; /* error already logged */ 2662 2663 if ((r = sshkey_load_public(keypath, &pubkey, NULL)) != 0) { 2664 error_r(r, "Couldn't load public key %s", keypath); 2665 goto done; 2666 } 2667 2668 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) { 2669 if (require_agent) 2670 fatal("Couldn't get agent socket"); 2671 debug_r(r, "Couldn't get agent socket"); 2672 } else { 2673 if ((r = ssh_agent_has_key(agent_fd, pubkey)) == 0) 2674 signer = agent_signer; 2675 else { 2676 if (require_agent) 2677 fatal("Couldn't find key in agent"); 2678 debug_r(r, "Couldn't find key in agent"); 2679 } 2680 } 2681 2682 if (signer == NULL) { 2683 /* Not using agent - try to load private key */ 2684 if ((privkey = load_sign_key(keypath, pubkey)) == NULL) 2685 goto done; 2686 signkey = privkey; 2687 } else { 2688 /* Will use key in agent */ 2689 signkey = pubkey; 2690 } 2691 2692 if (argc == 0) { 2693 if ((r = sign_one(signkey, "(stdin)", STDIN_FILENO, 2694 sig_namespace, hashalg, signer, &agent_fd)) != 0) 2695 goto done; 2696 } else { 2697 for (i = 0; i < argc; i++) { 2698 if (strcmp(argv[i], "-") == 0) 2699 fd = STDIN_FILENO; 2700 else if ((fd = open(argv[i], O_RDONLY)) == -1) { 2701 error("Cannot open %s for signing: %s", 2702 argv[i], strerror(errno)); 2703 goto done; 2704 } 2705 if ((r = sign_one(signkey, argv[i], fd, sig_namespace, 2706 hashalg, signer, &agent_fd)) != 0) 2707 goto done; 2708 if (fd != STDIN_FILENO) 2709 close(fd); 2710 fd = -1; 2711 } 2712 } 2713 2714 ret = 0; 2715 done: 2716 if (fd != -1 && fd != STDIN_FILENO) 2717 close(fd); 2718 sshkey_free(pubkey); 2719 sshkey_free(privkey); 2720 free(hashalg); 2721 return ret; 2722 } 2723 2724 static int 2725 sig_verify(const char *signature, const char *sig_namespace, 2726 const char *principal, const char *allowed_keys, const char *revoked_keys, 2727 char * const *opts, size_t nopts) 2728 { 2729 int r, ret = -1; 2730 int print_pubkey = 0; 2731 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2732 struct sshkey *sign_key = NULL; 2733 char *fp = NULL; 2734 struct sshkey_sig_details *sig_details = NULL; 2735 uint64_t verify_time = 0; 2736 2737 if (sig_process_opts(opts, nopts, NULL, &verify_time, 2738 &print_pubkey) != 0) 2739 goto done; /* error already logged */ 2740 2741 memset(&sig_details, 0, sizeof(sig_details)); 2742 if ((r = sshbuf_load_file(signature, &abuf)) != 0) { 2743 error_r(r, "Couldn't read signature file"); 2744 goto done; 2745 } 2746 2747 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) { 2748 error_fr(r, "sshsig_armor"); 2749 goto done; 2750 } 2751 if ((r = sshsig_verify_fd(sigbuf, STDIN_FILENO, sig_namespace, 2752 &sign_key, &sig_details)) != 0) 2753 goto done; /* sshsig_verify() prints error */ 2754 2755 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash, 2756 SSH_FP_DEFAULT)) == NULL) 2757 fatal_f("sshkey_fingerprint failed"); 2758 debug("Valid (unverified) signature from key %s", fp); 2759 if (sig_details != NULL) { 2760 debug2_f("signature details: counter = %u, flags = 0x%02x", 2761 sig_details->sk_counter, sig_details->sk_flags); 2762 } 2763 free(fp); 2764 fp = NULL; 2765 2766 if (revoked_keys != NULL) { 2767 if ((r = sshkey_check_revoked(sign_key, revoked_keys)) != 0) { 2768 debug3_fr(r, "sshkey_check_revoked"); 2769 goto done; 2770 } 2771 } 2772 2773 if (allowed_keys != NULL && (r = sshsig_check_allowed_keys(allowed_keys, 2774 sign_key, principal, sig_namespace, verify_time)) != 0) { 2775 debug3_fr(r, "sshsig_check_allowed_keys"); 2776 goto done; 2777 } 2778 /* success */ 2779 ret = 0; 2780 done: 2781 if (!quiet) { 2782 if (ret == 0) { 2783 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash, 2784 SSH_FP_DEFAULT)) == NULL) 2785 fatal_f("sshkey_fingerprint failed"); 2786 if (principal == NULL) { 2787 printf("Good \"%s\" signature with %s key %s\n", 2788 sig_namespace, sshkey_type(sign_key), fp); 2789 2790 } else { 2791 printf("Good \"%s\" signature for %s with %s key %s\n", 2792 sig_namespace, principal, 2793 sshkey_type(sign_key), fp); 2794 } 2795 } else { 2796 printf("Could not verify signature.\n"); 2797 } 2798 } 2799 /* Print the signature key if requested */ 2800 if (ret == 0 && print_pubkey && sign_key != NULL) { 2801 if ((r = sshkey_write(sign_key, stdout)) == 0) 2802 fputc('\n', stdout); 2803 else { 2804 error_r(r, "Could not print public key.\n"); 2805 ret = -1; 2806 } 2807 } 2808 sshbuf_free(sigbuf); 2809 sshbuf_free(abuf); 2810 sshkey_free(sign_key); 2811 sshkey_sig_details_free(sig_details); 2812 free(fp); 2813 return ret; 2814 } 2815 2816 static int 2817 sig_find_principals(const char *signature, const char *allowed_keys, 2818 char * const *opts, size_t nopts) 2819 { 2820 int r, ret = -1; 2821 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2822 struct sshkey *sign_key = NULL; 2823 char *principals = NULL, *cp, *tmp; 2824 uint64_t verify_time = 0; 2825 2826 if (sig_process_opts(opts, nopts, NULL, &verify_time, NULL) != 0) 2827 goto done; /* error already logged */ 2828 2829 if ((r = sshbuf_load_file(signature, &abuf)) != 0) { 2830 error_r(r, "Couldn't read signature file"); 2831 goto done; 2832 } 2833 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) { 2834 error_fr(r, "sshsig_armor"); 2835 goto done; 2836 } 2837 if ((r = sshsig_get_pubkey(sigbuf, &sign_key)) != 0) { 2838 error_fr(r, "sshsig_get_pubkey"); 2839 goto done; 2840 } 2841 if ((r = sshsig_find_principals(allowed_keys, sign_key, 2842 verify_time, &principals)) != 0) { 2843 if (r != SSH_ERR_KEY_NOT_FOUND) 2844 error_fr(r, "sshsig_find_principal"); 2845 goto done; 2846 } 2847 ret = 0; 2848 done: 2849 if (ret == 0 ) { 2850 /* Emit matching principals one per line */ 2851 tmp = principals; 2852 while ((cp = strsep(&tmp, ",")) != NULL && *cp != '\0') 2853 puts(cp); 2854 } else { 2855 fprintf(stderr, "No principal matched.\n"); 2856 } 2857 sshbuf_free(sigbuf); 2858 sshbuf_free(abuf); 2859 sshkey_free(sign_key); 2860 free(principals); 2861 return ret; 2862 } 2863 2864 static int 2865 sig_match_principals(const char *allowed_keys, char *principal, 2866 char * const *opts, size_t nopts) 2867 { 2868 int r; 2869 char **principals = NULL; 2870 size_t i, nprincipals = 0; 2871 2872 if ((r = sig_process_opts(opts, nopts, NULL, NULL, NULL)) != 0) 2873 return r; /* error already logged */ 2874 2875 if ((r = sshsig_match_principals(allowed_keys, principal, 2876 &principals, &nprincipals)) != 0) { 2877 debug_f("match: %s", ssh_err(r)); 2878 fprintf(stderr, "No principal matched.\n"); 2879 return r; 2880 } 2881 for (i = 0; i < nprincipals; i++) { 2882 printf("%s\n", principals[i]); 2883 free(principals[i]); 2884 } 2885 free(principals); 2886 2887 return 0; 2888 } 2889 2890 static void 2891 do_moduli_gen(const char *out_file, char **opts, size_t nopts) 2892 { 2893 #ifdef WITH_OPENSSL 2894 /* Moduli generation/screening */ 2895 u_int32_t memory = 0; 2896 BIGNUM *start = NULL; 2897 int moduli_bits = 0; 2898 FILE *out; 2899 size_t i; 2900 const char *errstr; 2901 2902 /* Parse options */ 2903 for (i = 0; i < nopts; i++) { 2904 if (strncmp(opts[i], "memory=", 7) == 0) { 2905 memory = (u_int32_t)strtonum(opts[i]+7, 1, 2906 UINT_MAX, &errstr); 2907 if (errstr) { 2908 fatal("Memory limit is %s: %s", 2909 errstr, opts[i]+7); 2910 } 2911 } else if (strncmp(opts[i], "start=", 6) == 0) { 2912 /* XXX - also compare length against bits */ 2913 if (BN_hex2bn(&start, opts[i]+6) == 0) 2914 fatal("Invalid start point."); 2915 } else if (strncmp(opts[i], "bits=", 5) == 0) { 2916 moduli_bits = (int)strtonum(opts[i]+5, 1, 2917 INT_MAX, &errstr); 2918 if (errstr) { 2919 fatal("Invalid number: %s (%s)", 2920 opts[i]+12, errstr); 2921 } 2922 } else { 2923 fatal("Option \"%s\" is unsupported for moduli " 2924 "generation", opts[i]); 2925 } 2926 } 2927 2928 if ((out = fopen(out_file, "w")) == NULL) { 2929 fatal("Couldn't open modulus candidate file \"%s\": %s", 2930 out_file, strerror(errno)); 2931 } 2932 setvbuf(out, NULL, _IOLBF, 0); 2933 2934 if (moduli_bits == 0) 2935 moduli_bits = DEFAULT_BITS; 2936 if (gen_candidates(out, memory, moduli_bits, start) != 0) 2937 fatal("modulus candidate generation failed"); 2938 #else /* WITH_OPENSSL */ 2939 fatal("Moduli generation is not supported"); 2940 #endif /* WITH_OPENSSL */ 2941 } 2942 2943 static void 2944 do_moduli_screen(const char *out_file, char **opts, size_t nopts) 2945 { 2946 #ifdef WITH_OPENSSL 2947 /* Moduli generation/screening */ 2948 char *checkpoint = NULL; 2949 u_int32_t generator_wanted = 0; 2950 unsigned long start_lineno = 0, lines_to_process = 0; 2951 int prime_tests = 0; 2952 FILE *out, *in = stdin; 2953 size_t i; 2954 const char *errstr; 2955 2956 /* Parse options */ 2957 for (i = 0; i < nopts; i++) { 2958 if (strncmp(opts[i], "lines=", 6) == 0) { 2959 lines_to_process = strtoul(opts[i]+6, NULL, 10); 2960 } else if (strncmp(opts[i], "start-line=", 11) == 0) { 2961 start_lineno = strtoul(opts[i]+11, NULL, 10); 2962 } else if (strncmp(opts[i], "checkpoint=", 11) == 0) { 2963 checkpoint = xstrdup(opts[i]+11); 2964 } else if (strncmp(opts[i], "generator=", 10) == 0) { 2965 generator_wanted = (u_int32_t)strtonum( 2966 opts[i]+10, 1, UINT_MAX, &errstr); 2967 if (errstr != NULL) { 2968 fatal("Generator invalid: %s (%s)", 2969 opts[i]+10, errstr); 2970 } 2971 } else if (strncmp(opts[i], "prime-tests=", 12) == 0) { 2972 prime_tests = (int)strtonum(opts[i]+12, 1, 2973 INT_MAX, &errstr); 2974 if (errstr) { 2975 fatal("Invalid number: %s (%s)", 2976 opts[i]+12, errstr); 2977 } 2978 } else { 2979 fatal("Option \"%s\" is unsupported for moduli " 2980 "screening", opts[i]); 2981 } 2982 } 2983 2984 if (have_identity && strcmp(identity_file, "-") != 0) { 2985 if ((in = fopen(identity_file, "r")) == NULL) { 2986 fatal("Couldn't open modulus candidate " 2987 "file \"%s\": %s", identity_file, 2988 strerror(errno)); 2989 } 2990 } 2991 2992 if ((out = fopen(out_file, "a")) == NULL) { 2993 fatal("Couldn't open moduli file \"%s\": %s", 2994 out_file, strerror(errno)); 2995 } 2996 setvbuf(out, NULL, _IOLBF, 0); 2997 if (prime_test(in, out, prime_tests == 0 ? 100 : prime_tests, 2998 generator_wanted, checkpoint, 2999 start_lineno, lines_to_process) != 0) 3000 fatal("modulus screening failed"); 3001 #else /* WITH_OPENSSL */ 3002 fatal("Moduli screening is not supported"); 3003 #endif /* WITH_OPENSSL */ 3004 } 3005 3006 static char * 3007 private_key_passphrase(void) 3008 { 3009 char *passphrase1, *passphrase2; 3010 3011 /* Ask for a passphrase (twice). */ 3012 if (identity_passphrase) 3013 passphrase1 = xstrdup(identity_passphrase); 3014 else if (identity_new_passphrase) 3015 passphrase1 = xstrdup(identity_new_passphrase); 3016 else { 3017 passphrase_again: 3018 passphrase1 = 3019 read_passphrase("Enter passphrase (empty for no " 3020 "passphrase): ", RP_ALLOW_STDIN); 3021 passphrase2 = read_passphrase("Enter same passphrase again: ", 3022 RP_ALLOW_STDIN); 3023 if (strcmp(passphrase1, passphrase2) != 0) { 3024 /* 3025 * The passphrases do not match. Clear them and 3026 * retry. 3027 */ 3028 freezero(passphrase1, strlen(passphrase1)); 3029 freezero(passphrase2, strlen(passphrase2)); 3030 printf("Passphrases do not match. Try again.\n"); 3031 goto passphrase_again; 3032 } 3033 /* Clear the other copy of the passphrase. */ 3034 freezero(passphrase2, strlen(passphrase2)); 3035 } 3036 return passphrase1; 3037 } 3038 3039 static char * 3040 sk_suffix(const char *application, const uint8_t *user, size_t userlen) 3041 { 3042 char *ret, *cp; 3043 size_t slen, i; 3044 3045 /* Trim off URL-like preamble */ 3046 if (strncmp(application, "ssh://", 6) == 0) 3047 ret = xstrdup(application + 6); 3048 else if (strncmp(application, "ssh:", 4) == 0) 3049 ret = xstrdup(application + 4); 3050 else 3051 ret = xstrdup(application); 3052 3053 /* Count trailing zeros in user */ 3054 for (i = 0; i < userlen; i++) { 3055 if (user[userlen - i - 1] != 0) 3056 break; 3057 } 3058 if (i >= userlen) 3059 return ret; /* user-id was default all-zeros */ 3060 3061 /* Append user-id, escaping non-UTF-8 characters */ 3062 slen = userlen - i; 3063 if (asmprintf(&cp, INT_MAX, NULL, "%.*s", (int)slen, user) == -1) 3064 fatal_f("asmprintf failed"); 3065 /* Don't emit a user-id that contains path or control characters */ 3066 if (strchr(cp, '/') != NULL || strstr(cp, "..") != NULL || 3067 strchr(cp, '\\') != NULL) { 3068 free(cp); 3069 cp = tohex(user, slen); 3070 } 3071 xextendf(&ret, "_", "%s", cp); 3072 free(cp); 3073 return ret; 3074 } 3075 3076 static int 3077 do_download_sk(const char *skprovider, const char *device) 3078 { 3079 struct sshsk_resident_key **srks; 3080 size_t nsrks, i; 3081 int r, ret = -1; 3082 char *fp, *pin = NULL, *pass = NULL, *path, *pubpath; 3083 const char *ext; 3084 struct sshkey *key; 3085 3086 if (skprovider == NULL) 3087 fatal("Cannot download keys without provider"); 3088 3089 pin = read_passphrase("Enter PIN for authenticator: ", RP_ALLOW_STDIN); 3090 if (!quiet) { 3091 printf("You may need to touch your authenticator " 3092 "to authorize key download.\n"); 3093 } 3094 if ((r = sshsk_load_resident(skprovider, device, pin, 0, 3095 &srks, &nsrks)) != 0) { 3096 if (pin != NULL) 3097 freezero(pin, strlen(pin)); 3098 error_r(r, "Unable to load resident keys"); 3099 return -1; 3100 } 3101 if (nsrks == 0) 3102 logit("No keys to download"); 3103 if (pin != NULL) 3104 freezero(pin, strlen(pin)); 3105 3106 for (i = 0; i < nsrks; i++) { 3107 key = srks[i]->key; 3108 if (key->type != KEY_ECDSA_SK && key->type != KEY_ED25519_SK) { 3109 error("Unsupported key type %s (%d)", 3110 sshkey_type(key), key->type); 3111 continue; 3112 } 3113 if ((fp = sshkey_fingerprint(key, fingerprint_hash, 3114 SSH_FP_DEFAULT)) == NULL) 3115 fatal_f("sshkey_fingerprint failed"); 3116 debug_f("key %zu: %s %s %s (flags 0x%02x)", i, 3117 sshkey_type(key), fp, key->sk_application, key->sk_flags); 3118 ext = sk_suffix(key->sk_application, 3119 srks[i]->user_id, srks[i]->user_id_len); 3120 xasprintf(&path, "id_%s_rk%s%s", 3121 key->type == KEY_ECDSA_SK ? "ecdsa_sk" : "ed25519_sk", 3122 *ext == '\0' ? "" : "_", ext); 3123 3124 /* If the file already exists, ask the user to confirm. */ 3125 if (!confirm_overwrite(path)) { 3126 free(path); 3127 break; 3128 } 3129 3130 /* Save the key with the application string as the comment */ 3131 if (pass == NULL) 3132 pass = private_key_passphrase(); 3133 if ((r = sshkey_save_private(key, path, pass, 3134 key->sk_application, private_key_format, 3135 openssh_format_cipher, rounds)) != 0) { 3136 error_r(r, "Saving key \"%s\" failed", path); 3137 free(path); 3138 break; 3139 } 3140 if (!quiet) { 3141 printf("Saved %s key%s%s to %s\n", sshkey_type(key), 3142 *ext != '\0' ? " " : "", 3143 *ext != '\0' ? key->sk_application : "", 3144 path); 3145 } 3146 3147 /* Save public key too */ 3148 xasprintf(&pubpath, "%s.pub", path); 3149 free(path); 3150 if ((r = sshkey_save_public(key, pubpath, 3151 key->sk_application)) != 0) { 3152 error_r(r, "Saving public key \"%s\" failed", pubpath); 3153 free(pubpath); 3154 break; 3155 } 3156 free(pubpath); 3157 } 3158 3159 if (i >= nsrks) 3160 ret = 0; /* success */ 3161 if (pass != NULL) 3162 freezero(pass, strlen(pass)); 3163 sshsk_free_resident_keys(srks, nsrks); 3164 return ret; 3165 } 3166 3167 static void 3168 save_attestation(struct sshbuf *attest, const char *path) 3169 { 3170 mode_t omask; 3171 int r; 3172 3173 if (path == NULL) 3174 return; /* nothing to do */ 3175 if (attest == NULL || sshbuf_len(attest) == 0) 3176 fatal("Enrollment did not return attestation data"); 3177 omask = umask(077); 3178 r = sshbuf_write_file(path, attest); 3179 umask(omask); 3180 if (r != 0) 3181 fatal_r(r, "Unable to write attestation data \"%s\"", path); 3182 if (!quiet) 3183 printf("Your FIDO attestation certificate has been saved in " 3184 "%s\n", path); 3185 } 3186 3187 static void 3188 usage(void) 3189 { 3190 fprintf(stderr, 3191 "usage: ssh-keygen [-q] [-a rounds] [-b bits] [-C comment] [-f output_keyfile]\n" 3192 " [-m format] [-N new_passphrase] [-O option]\n" 3193 " [-t dsa | ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa]\n" 3194 " [-w provider] [-Z cipher]\n" 3195 " ssh-keygen -p [-a rounds] [-f keyfile] [-m format] [-N new_passphrase]\n" 3196 " [-P old_passphrase] [-Z cipher]\n" 3197 #ifdef WITH_OPENSSL 3198 " ssh-keygen -i [-f input_keyfile] [-m key_format]\n" 3199 " ssh-keygen -e [-f input_keyfile] [-m key_format]\n" 3200 #endif 3201 " ssh-keygen -y [-f input_keyfile]\n" 3202 " ssh-keygen -c [-a rounds] [-C comment] [-f keyfile] [-P passphrase]\n" 3203 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n" 3204 " ssh-keygen -B [-f input_keyfile]\n"); 3205 #ifdef ENABLE_PKCS11 3206 fprintf(stderr, 3207 " ssh-keygen -D pkcs11\n"); 3208 #endif 3209 fprintf(stderr, 3210 " ssh-keygen -F hostname [-lv] [-f known_hosts_file]\n" 3211 " ssh-keygen -H [-f known_hosts_file]\n" 3212 " ssh-keygen -K [-a rounds] [-w provider]\n" 3213 " ssh-keygen -R hostname [-f known_hosts_file]\n" 3214 " ssh-keygen -r hostname [-g] [-f input_keyfile]\n" 3215 #ifdef WITH_OPENSSL 3216 " ssh-keygen -M generate [-O option] output_file\n" 3217 " ssh-keygen -M screen [-f input_file] [-O option] output_file\n" 3218 #endif 3219 " ssh-keygen -I certificate_identity -s ca_key [-hU] [-D pkcs11_provider]\n" 3220 " [-n principals] [-O option] [-V validity_interval]\n" 3221 " [-z serial_number] file ...\n" 3222 " ssh-keygen -L [-f input_keyfile]\n" 3223 " ssh-keygen -A [-a rounds] [-f prefix_path]\n" 3224 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n" 3225 " file ...\n" 3226 " ssh-keygen -Q [-l] -f krl_file [file ...]\n" 3227 " ssh-keygen -Y find-principals -s signature_file -f allowed_signers_file\n" 3228 " ssh-keygen -Y match-principals -I signer_identity -f allowed_signers_file\n" 3229 " ssh-keygen -Y check-novalidate -n namespace -s signature_file\n" 3230 " ssh-keygen -Y sign -f key_file -n namespace file [-O option] ...\n" 3231 " ssh-keygen -Y verify -f allowed_signers_file -I signer_identity\n" 3232 " -n namespace -s signature_file [-r krl_file] [-O option]\n"); 3233 exit(1); 3234 } 3235 3236 /* 3237 * Main program for key management. 3238 */ 3239 int 3240 main(int argc, char **argv) 3241 { 3242 char comment[1024], *passphrase; 3243 char *rr_hostname = NULL, *ep, *fp, *ra; 3244 struct sshkey *private, *public; 3245 struct passwd *pw; 3246 int r, opt, type; 3247 int change_passphrase = 0, change_comment = 0, show_cert = 0; 3248 int find_host = 0, delete_host = 0, hash_hosts = 0; 3249 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 3250 int prefer_agent = 0, convert_to = 0, convert_from = 0; 3251 int print_public = 0, print_generic = 0, cert_serial_autoinc = 0; 3252 int do_gen_candidates = 0, do_screen_candidates = 0, download_sk = 0; 3253 unsigned long long cert_serial = 0; 3254 char *identity_comment = NULL, *ca_key_path = NULL, **opts = NULL; 3255 char *sk_application = NULL, *sk_device = NULL, *sk_user = NULL; 3256 char *sk_attestation_path = NULL; 3257 struct sshbuf *challenge = NULL, *attest = NULL; 3258 size_t i, nopts = 0; 3259 u_int32_t bits = 0; 3260 uint8_t sk_flags = SSH_SK_USER_PRESENCE_REQD; 3261 const char *errstr; 3262 int log_level = SYSLOG_LEVEL_INFO; 3263 char *sign_op = NULL; 3264 3265 extern int optind; 3266 extern char *optarg; 3267 3268 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 3269 sanitise_stdfd(); 3270 3271 #ifdef WITH_OPENSSL 3272 OpenSSL_add_all_algorithms(); 3273 #endif 3274 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 3275 3276 setlocale(LC_CTYPE, ""); 3277 3278 /* we need this for the home * directory. */ 3279 pw = getpwuid(getuid()); 3280 if (!pw) 3281 fatal("No user exists for uid %lu", (u_long)getuid()); 3282 pw = pwcopy(pw); 3283 if (gethostname(hostname, sizeof(hostname)) == -1) 3284 fatal("gethostname: %s", strerror(errno)); 3285 3286 sk_provider = getenv("SSH_SK_PROVIDER"); 3287 3288 /* Remaining characters: dGjJSTWx */ 3289 while ((opt = getopt(argc, argv, "ABHKLQUXceghiklopquvy" 3290 "C:D:E:F:I:M:N:O:P:R:V:Y:Z:" 3291 "a:b:f:g:m:n:r:s:t:w:z:")) != -1) { 3292 switch (opt) { 3293 case 'A': 3294 gen_all_hostkeys = 1; 3295 break; 3296 case 'b': 3297 bits = (u_int32_t)strtonum(optarg, 1, UINT32_MAX, 3298 &errstr); 3299 if (errstr) 3300 fatal("Bits has bad value %s (%s)", 3301 optarg, errstr); 3302 break; 3303 case 'E': 3304 fingerprint_hash = ssh_digest_alg_by_name(optarg); 3305 if (fingerprint_hash == -1) 3306 fatal("Invalid hash algorithm \"%s\"", optarg); 3307 break; 3308 case 'F': 3309 find_host = 1; 3310 rr_hostname = optarg; 3311 break; 3312 case 'H': 3313 hash_hosts = 1; 3314 break; 3315 case 'I': 3316 cert_key_id = optarg; 3317 break; 3318 case 'R': 3319 delete_host = 1; 3320 rr_hostname = optarg; 3321 break; 3322 case 'L': 3323 show_cert = 1; 3324 break; 3325 case 'l': 3326 print_fingerprint = 1; 3327 break; 3328 case 'B': 3329 print_bubblebabble = 1; 3330 break; 3331 case 'm': 3332 if (strcasecmp(optarg, "RFC4716") == 0 || 3333 strcasecmp(optarg, "ssh2") == 0) { 3334 convert_format = FMT_RFC4716; 3335 break; 3336 } 3337 if (strcasecmp(optarg, "PKCS8") == 0) { 3338 convert_format = FMT_PKCS8; 3339 private_key_format = SSHKEY_PRIVATE_PKCS8; 3340 break; 3341 } 3342 if (strcasecmp(optarg, "PEM") == 0) { 3343 convert_format = FMT_PEM; 3344 private_key_format = SSHKEY_PRIVATE_PEM; 3345 break; 3346 } 3347 fatal("Unsupported conversion format \"%s\"", optarg); 3348 case 'n': 3349 cert_principals = optarg; 3350 break; 3351 case 'o': 3352 /* no-op; new format is already the default */ 3353 break; 3354 case 'p': 3355 change_passphrase = 1; 3356 break; 3357 case 'c': 3358 change_comment = 1; 3359 break; 3360 case 'f': 3361 if (strlcpy(identity_file, optarg, 3362 sizeof(identity_file)) >= sizeof(identity_file)) 3363 fatal("Identity filename too long"); 3364 have_identity = 1; 3365 break; 3366 case 'g': 3367 print_generic = 1; 3368 break; 3369 case 'K': 3370 download_sk = 1; 3371 break; 3372 case 'P': 3373 identity_passphrase = optarg; 3374 break; 3375 case 'N': 3376 identity_new_passphrase = optarg; 3377 break; 3378 case 'Q': 3379 check_krl = 1; 3380 break; 3381 case 'O': 3382 opts = xrecallocarray(opts, nopts, nopts + 1, 3383 sizeof(*opts)); 3384 opts[nopts++] = xstrdup(optarg); 3385 break; 3386 case 'Z': 3387 openssh_format_cipher = optarg; 3388 if (cipher_by_name(openssh_format_cipher) == NULL) 3389 fatal("Invalid OpenSSH-format cipher '%s'", 3390 openssh_format_cipher); 3391 break; 3392 case 'C': 3393 identity_comment = optarg; 3394 break; 3395 case 'q': 3396 quiet = 1; 3397 break; 3398 case 'e': 3399 /* export key */ 3400 convert_to = 1; 3401 break; 3402 case 'h': 3403 cert_key_type = SSH2_CERT_TYPE_HOST; 3404 certflags_flags = 0; 3405 break; 3406 case 'k': 3407 gen_krl = 1; 3408 break; 3409 case 'i': 3410 case 'X': 3411 /* import key */ 3412 convert_from = 1; 3413 break; 3414 case 'y': 3415 print_public = 1; 3416 break; 3417 case 's': 3418 ca_key_path = optarg; 3419 break; 3420 case 't': 3421 key_type_name = optarg; 3422 break; 3423 case 'D': 3424 pkcs11provider = optarg; 3425 break; 3426 case 'U': 3427 prefer_agent = 1; 3428 break; 3429 case 'u': 3430 update_krl = 1; 3431 break; 3432 case 'v': 3433 if (log_level == SYSLOG_LEVEL_INFO) 3434 log_level = SYSLOG_LEVEL_DEBUG1; 3435 else { 3436 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 3437 log_level < SYSLOG_LEVEL_DEBUG3) 3438 log_level++; 3439 } 3440 break; 3441 case 'r': 3442 rr_hostname = optarg; 3443 break; 3444 case 'a': 3445 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr); 3446 if (errstr) 3447 fatal("Invalid number: %s (%s)", 3448 optarg, errstr); 3449 break; 3450 case 'V': 3451 parse_cert_times(optarg); 3452 break; 3453 case 'Y': 3454 sign_op = optarg; 3455 break; 3456 case 'w': 3457 sk_provider = optarg; 3458 break; 3459 case 'z': 3460 errno = 0; 3461 if (*optarg == '+') { 3462 cert_serial_autoinc = 1; 3463 optarg++; 3464 } 3465 cert_serial = strtoull(optarg, &ep, 10); 3466 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 3467 (errno == ERANGE && cert_serial == ULLONG_MAX)) 3468 fatal("Invalid serial number \"%s\"", optarg); 3469 break; 3470 case 'M': 3471 if (strcmp(optarg, "generate") == 0) 3472 do_gen_candidates = 1; 3473 else if (strcmp(optarg, "screen") == 0) 3474 do_screen_candidates = 1; 3475 else 3476 fatal("Unsupported moduli option %s", optarg); 3477 break; 3478 case '?': 3479 default: 3480 usage(); 3481 } 3482 } 3483 3484 if (sk_provider == NULL) 3485 sk_provider = "internal"; 3486 3487 /* reinit */ 3488 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 3489 3490 argv += optind; 3491 argc -= optind; 3492 3493 if (sign_op != NULL) { 3494 if (strncmp(sign_op, "find-principals", 15) == 0) { 3495 if (ca_key_path == NULL) { 3496 error("Too few arguments for find-principals:" 3497 "missing signature file"); 3498 exit(1); 3499 } 3500 if (!have_identity) { 3501 error("Too few arguments for find-principals:" 3502 "missing allowed keys file"); 3503 exit(1); 3504 } 3505 return sig_find_principals(ca_key_path, identity_file, 3506 opts, nopts); 3507 } else if (strncmp(sign_op, "match-principals", 16) == 0) { 3508 if (!have_identity) { 3509 error("Too few arguments for match-principals:" 3510 "missing allowed keys file"); 3511 exit(1); 3512 } 3513 if (cert_key_id == NULL) { 3514 error("Too few arguments for match-principals: " 3515 "missing principal ID"); 3516 exit(1); 3517 } 3518 return sig_match_principals(identity_file, cert_key_id, 3519 opts, nopts); 3520 } else if (strncmp(sign_op, "sign", 4) == 0) { 3521 /* NB. cert_principals is actually namespace, via -n */ 3522 if (cert_principals == NULL || 3523 *cert_principals == '\0') { 3524 error("Too few arguments for sign: " 3525 "missing namespace"); 3526 exit(1); 3527 } 3528 if (!have_identity) { 3529 error("Too few arguments for sign: " 3530 "missing key"); 3531 exit(1); 3532 } 3533 return sig_sign(identity_file, cert_principals, 3534 prefer_agent, argc, argv, opts, nopts); 3535 } else if (strncmp(sign_op, "check-novalidate", 16) == 0) { 3536 /* NB. cert_principals is actually namespace, via -n */ 3537 if (cert_principals == NULL || 3538 *cert_principals == '\0') { 3539 error("Too few arguments for check-novalidate: " 3540 "missing namespace"); 3541 exit(1); 3542 } 3543 if (ca_key_path == NULL) { 3544 error("Too few arguments for check-novalidate: " 3545 "missing signature file"); 3546 exit(1); 3547 } 3548 return sig_verify(ca_key_path, cert_principals, 3549 NULL, NULL, NULL, opts, nopts); 3550 } else if (strncmp(sign_op, "verify", 6) == 0) { 3551 /* NB. cert_principals is actually namespace, via -n */ 3552 if (cert_principals == NULL || 3553 *cert_principals == '\0') { 3554 error("Too few arguments for verify: " 3555 "missing namespace"); 3556 exit(1); 3557 } 3558 if (ca_key_path == NULL) { 3559 error("Too few arguments for verify: " 3560 "missing signature file"); 3561 exit(1); 3562 } 3563 if (!have_identity) { 3564 error("Too few arguments for sign: " 3565 "missing allowed keys file"); 3566 exit(1); 3567 } 3568 if (cert_key_id == NULL) { 3569 error("Too few arguments for verify: " 3570 "missing principal identity"); 3571 exit(1); 3572 } 3573 return sig_verify(ca_key_path, cert_principals, 3574 cert_key_id, identity_file, rr_hostname, 3575 opts, nopts); 3576 } 3577 error("Unsupported operation for -Y: \"%s\"", sign_op); 3578 usage(); 3579 /* NOTREACHED */ 3580 } 3581 3582 if (ca_key_path != NULL) { 3583 if (argc < 1 && !gen_krl) { 3584 error("Too few arguments."); 3585 usage(); 3586 } 3587 } else if (argc > 0 && !gen_krl && !check_krl && 3588 !do_gen_candidates && !do_screen_candidates) { 3589 error("Too many arguments."); 3590 usage(); 3591 } 3592 if (change_passphrase && change_comment) { 3593 error("Can only have one of -p and -c."); 3594 usage(); 3595 } 3596 if (print_fingerprint && (delete_host || hash_hosts)) { 3597 error("Cannot use -l with -H or -R."); 3598 usage(); 3599 } 3600 if (gen_krl) { 3601 do_gen_krl(pw, update_krl, ca_key_path, 3602 cert_serial, identity_comment, argc, argv); 3603 return (0); 3604 } 3605 if (check_krl) { 3606 do_check_krl(pw, print_fingerprint, argc, argv); 3607 return (0); 3608 } 3609 if (ca_key_path != NULL) { 3610 if (cert_key_id == NULL) 3611 fatal("Must specify key id (-I) when certifying"); 3612 for (i = 0; i < nopts; i++) 3613 add_cert_option(opts[i]); 3614 do_ca_sign(pw, ca_key_path, prefer_agent, 3615 cert_serial, cert_serial_autoinc, argc, argv); 3616 } 3617 if (show_cert) 3618 do_show_cert(pw); 3619 if (delete_host || hash_hosts || find_host) { 3620 do_known_hosts(pw, rr_hostname, find_host, 3621 delete_host, hash_hosts); 3622 } 3623 if (pkcs11provider != NULL) 3624 do_download(pw); 3625 if (download_sk) { 3626 for (i = 0; i < nopts; i++) { 3627 if (strncasecmp(opts[i], "device=", 7) == 0) { 3628 sk_device = xstrdup(opts[i] + 7); 3629 } else { 3630 fatal("Option \"%s\" is unsupported for " 3631 "FIDO authenticator download", opts[i]); 3632 } 3633 } 3634 return do_download_sk(sk_provider, sk_device); 3635 } 3636 if (print_fingerprint || print_bubblebabble) 3637 do_fingerprint(pw); 3638 if (change_passphrase) 3639 do_change_passphrase(pw); 3640 if (change_comment) 3641 do_change_comment(pw, identity_comment); 3642 #ifdef WITH_OPENSSL 3643 if (convert_to) 3644 do_convert_to(pw); 3645 if (convert_from) 3646 do_convert_from(pw); 3647 #else /* WITH_OPENSSL */ 3648 if (convert_to || convert_from) 3649 fatal("key conversion disabled at compile time"); 3650 #endif /* WITH_OPENSSL */ 3651 if (print_public) 3652 do_print_public(pw); 3653 if (rr_hostname != NULL) { 3654 unsigned int n = 0; 3655 3656 if (have_identity) { 3657 n = do_print_resource_record(pw, identity_file, 3658 rr_hostname, print_generic); 3659 if (n == 0) 3660 fatal("%s: %s", identity_file, strerror(errno)); 3661 exit(0); 3662 } else { 3663 3664 n += do_print_resource_record(pw, 3665 _PATH_HOST_RSA_KEY_FILE, rr_hostname, 3666 print_generic); 3667 n += do_print_resource_record(pw, 3668 _PATH_HOST_DSA_KEY_FILE, rr_hostname, 3669 print_generic); 3670 n += do_print_resource_record(pw, 3671 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname, 3672 print_generic); 3673 n += do_print_resource_record(pw, 3674 _PATH_HOST_ED25519_KEY_FILE, rr_hostname, 3675 print_generic); 3676 n += do_print_resource_record(pw, 3677 _PATH_HOST_XMSS_KEY_FILE, rr_hostname, 3678 print_generic); 3679 if (n == 0) 3680 fatal("no keys found."); 3681 exit(0); 3682 } 3683 } 3684 3685 if (do_gen_candidates || do_screen_candidates) { 3686 if (argc <= 0) 3687 fatal("No output file specified"); 3688 else if (argc > 1) 3689 fatal("Too many output files specified"); 3690 } 3691 if (do_gen_candidates) { 3692 do_moduli_gen(argv[0], opts, nopts); 3693 return 0; 3694 } 3695 if (do_screen_candidates) { 3696 do_moduli_screen(argv[0], opts, nopts); 3697 return 0; 3698 } 3699 3700 if (gen_all_hostkeys) { 3701 do_gen_all_hostkeys(pw); 3702 return (0); 3703 } 3704 3705 if (key_type_name == NULL) 3706 key_type_name = DEFAULT_KEY_TYPE_NAME; 3707 3708 type = sshkey_type_from_name(key_type_name); 3709 type_bits_valid(type, key_type_name, &bits); 3710 3711 if (!quiet) 3712 printf("Generating public/private %s key pair.\n", 3713 key_type_name); 3714 switch (type) { 3715 case KEY_ECDSA_SK: 3716 case KEY_ED25519_SK: 3717 for (i = 0; i < nopts; i++) { 3718 if (strcasecmp(opts[i], "no-touch-required") == 0) { 3719 sk_flags &= ~SSH_SK_USER_PRESENCE_REQD; 3720 } else if (strcasecmp(opts[i], "verify-required") == 0) { 3721 sk_flags |= SSH_SK_USER_VERIFICATION_REQD; 3722 } else if (strcasecmp(opts[i], "resident") == 0) { 3723 sk_flags |= SSH_SK_RESIDENT_KEY; 3724 } else if (strncasecmp(opts[i], "device=", 7) == 0) { 3725 sk_device = xstrdup(opts[i] + 7); 3726 } else if (strncasecmp(opts[i], "user=", 5) == 0) { 3727 sk_user = xstrdup(opts[i] + 5); 3728 } else if (strncasecmp(opts[i], "challenge=", 10) == 0) { 3729 if ((r = sshbuf_load_file(opts[i] + 10, 3730 &challenge)) != 0) { 3731 fatal_r(r, "Unable to load FIDO " 3732 "enrollment challenge \"%s\"", 3733 opts[i] + 10); 3734 } 3735 } else if (strncasecmp(opts[i], 3736 "write-attestation=", 18) == 0) { 3737 sk_attestation_path = opts[i] + 18; 3738 } else if (strncasecmp(opts[i], 3739 "application=", 12) == 0) { 3740 sk_application = xstrdup(opts[i] + 12); 3741 if (strncmp(sk_application, "ssh:", 4) != 0) { 3742 fatal("FIDO application string must " 3743 "begin with \"ssh:\""); 3744 } 3745 } else { 3746 fatal("Option \"%s\" is unsupported for " 3747 "FIDO authenticator enrollment", opts[i]); 3748 } 3749 } 3750 if (!quiet) { 3751 printf("You may need to touch your authenticator " 3752 "to authorize key generation.\n"); 3753 } 3754 if ((attest = sshbuf_new()) == NULL) 3755 fatal("sshbuf_new failed"); 3756 if ((sk_flags & 3757 (SSH_SK_USER_VERIFICATION_REQD|SSH_SK_RESIDENT_KEY))) { 3758 passphrase = read_passphrase("Enter PIN for " 3759 "authenticator: ", RP_ALLOW_STDIN); 3760 } else { 3761 passphrase = NULL; 3762 } 3763 for (i = 0 ; ; i++) { 3764 fflush(stdout); 3765 r = sshsk_enroll(type, sk_provider, sk_device, 3766 sk_application == NULL ? "ssh:" : sk_application, 3767 sk_user, sk_flags, passphrase, challenge, 3768 &private, attest); 3769 if (r == 0) 3770 break; 3771 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 3772 fatal_r(r, "Key enrollment failed"); 3773 else if (passphrase != NULL) { 3774 error("PIN incorrect"); 3775 freezero(passphrase, strlen(passphrase)); 3776 passphrase = NULL; 3777 } 3778 if (i >= 3) 3779 fatal("Too many incorrect PINs"); 3780 passphrase = read_passphrase("Enter PIN for " 3781 "authenticator: ", RP_ALLOW_STDIN); 3782 if (!quiet) { 3783 printf("You may need to touch your " 3784 "authenticator (again) to authorize " 3785 "key generation.\n"); 3786 } 3787 } 3788 if (passphrase != NULL) { 3789 freezero(passphrase, strlen(passphrase)); 3790 passphrase = NULL; 3791 } 3792 break; 3793 default: 3794 if ((r = sshkey_generate(type, bits, &private)) != 0) 3795 fatal("sshkey_generate failed"); 3796 break; 3797 } 3798 if ((r = sshkey_from_private(private, &public)) != 0) 3799 fatal_r(r, "sshkey_from_private"); 3800 3801 if (!have_identity) 3802 ask_filename(pw, "Enter file in which to save the key"); 3803 3804 /* Create ~/.ssh directory if it doesn't already exist. */ 3805 hostfile_create_user_ssh_dir(identity_file, !quiet); 3806 3807 /* If the file already exists, ask the user to confirm. */ 3808 if (!confirm_overwrite(identity_file)) 3809 exit(1); 3810 3811 /* Determine the passphrase for the private key */ 3812 passphrase = private_key_passphrase(); 3813 if (identity_comment) { 3814 strlcpy(comment, identity_comment, sizeof(comment)); 3815 } else { 3816 /* Create default comment field for the passphrase. */ 3817 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 3818 } 3819 3820 /* Save the key with the given passphrase and comment. */ 3821 if ((r = sshkey_save_private(private, identity_file, passphrase, 3822 comment, private_key_format, openssh_format_cipher, rounds)) != 0) { 3823 error_r(r, "Saving key \"%s\" failed", identity_file); 3824 freezero(passphrase, strlen(passphrase)); 3825 exit(1); 3826 } 3827 freezero(passphrase, strlen(passphrase)); 3828 sshkey_free(private); 3829 3830 if (!quiet) { 3831 printf("Your identification has been saved in %s\n", 3832 identity_file); 3833 } 3834 3835 strlcat(identity_file, ".pub", sizeof(identity_file)); 3836 if ((r = sshkey_save_public(public, identity_file, comment)) != 0) 3837 fatal_r(r, "Unable to save public key to %s", identity_file); 3838 3839 if (!quiet) { 3840 fp = sshkey_fingerprint(public, fingerprint_hash, 3841 SSH_FP_DEFAULT); 3842 ra = sshkey_fingerprint(public, fingerprint_hash, 3843 SSH_FP_RANDOMART); 3844 if (fp == NULL || ra == NULL) 3845 fatal("sshkey_fingerprint failed"); 3846 printf("Your public key has been saved in %s\n", 3847 identity_file); 3848 printf("The key fingerprint is:\n"); 3849 printf("%s %s\n", fp, comment); 3850 printf("The key's randomart image is:\n"); 3851 printf("%s\n", ra); 3852 free(ra); 3853 free(fp); 3854 } 3855 3856 if (sk_attestation_path != NULL) 3857 save_attestation(attest, sk_attestation_path); 3858 3859 sshbuf_free(attest); 3860 sshkey_free(public); 3861 3862 exit(0); 3863 } 3864