1 /* $OpenBSD: ssh-keygen.c,v 1.450 2022/03/18 02:32:22 djm Exp $ */ 2 /* 3 * Author: Tatu Ylonen <ylo@cs.hut.fi> 4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * Identity and host key generation and maintenance. 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 */ 14 15 #include "includes.h" 16 17 #include <sys/types.h> 18 #include <sys/socket.h> 19 #include <sys/stat.h> 20 21 #ifdef WITH_OPENSSL 22 #include <openssl/evp.h> 23 #include <openssl/pem.h> 24 #include "openbsd-compat/openssl-compat.h" 25 #endif 26 27 #ifdef HAVE_STDINT_H 28 # include <stdint.h> 29 #endif 30 #include <errno.h> 31 #include <fcntl.h> 32 #include <netdb.h> 33 #ifdef HAVE_PATHS_H 34 # include <paths.h> 35 #endif 36 #include <pwd.h> 37 #include <stdarg.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 #include <limits.h> 43 #include <locale.h> 44 #include <time.h> 45 46 #include "xmalloc.h" 47 #include "sshkey.h" 48 #include "authfile.h" 49 #include "sshbuf.h" 50 #include "pathnames.h" 51 #include "log.h" 52 #include "misc.h" 53 #include "match.h" 54 #include "hostfile.h" 55 #include "dns.h" 56 #include "ssh.h" 57 #include "ssh2.h" 58 #include "ssherr.h" 59 #include "ssh-pkcs11.h" 60 #include "atomicio.h" 61 #include "krl.h" 62 #include "digest.h" 63 #include "utf8.h" 64 #include "authfd.h" 65 #include "sshsig.h" 66 #include "ssh-sk.h" 67 #include "sk-api.h" /* XXX for SSH_SK_USER_PRESENCE_REQD; remove */ 68 #include "cipher.h" 69 70 #ifdef WITH_OPENSSL 71 # define DEFAULT_KEY_TYPE_NAME "rsa" 72 #else 73 # define DEFAULT_KEY_TYPE_NAME "ed25519" 74 #endif 75 76 /* 77 * Default number of bits in the RSA, DSA and ECDSA keys. These value can be 78 * overridden on the command line. 79 * 80 * These values, with the exception of DSA, provide security equivalent to at 81 * least 128 bits of security according to NIST Special Publication 800-57: 82 * Recommendation for Key Management Part 1 rev 4 section 5.6.1. 83 * For DSA it (and FIPS-186-4 section 4.2) specifies that the only size for 84 * which a 160bit hash is acceptable is 1kbit, and since ssh-dss specifies only 85 * SHA1 we limit the DSA key size 1k bits. 86 */ 87 #define DEFAULT_BITS 3072 88 #define DEFAULT_BITS_DSA 1024 89 #define DEFAULT_BITS_ECDSA 256 90 91 static int quiet = 0; 92 93 /* Flag indicating that we just want to see the key fingerprint */ 94 static int print_fingerprint = 0; 95 static int print_bubblebabble = 0; 96 97 /* Hash algorithm to use for fingerprints. */ 98 static int fingerprint_hash = SSH_FP_HASH_DEFAULT; 99 100 /* The identity file name, given on the command line or entered by the user. */ 101 static char identity_file[PATH_MAX]; 102 static int have_identity = 0; 103 104 /* This is set to the passphrase if given on the command line. */ 105 static char *identity_passphrase = NULL; 106 107 /* This is set to the new passphrase if given on the command line. */ 108 static char *identity_new_passphrase = NULL; 109 110 /* Key type when certifying */ 111 static u_int cert_key_type = SSH2_CERT_TYPE_USER; 112 113 /* "key ID" of signed key */ 114 static char *cert_key_id = NULL; 115 116 /* Comma-separated list of principal names for certifying keys */ 117 static char *cert_principals = NULL; 118 119 /* Validity period for certificates */ 120 static u_int64_t cert_valid_from = 0; 121 static u_int64_t cert_valid_to = ~0ULL; 122 123 /* Certificate options */ 124 #define CERTOPT_X_FWD (1) 125 #define CERTOPT_AGENT_FWD (1<<1) 126 #define CERTOPT_PORT_FWD (1<<2) 127 #define CERTOPT_PTY (1<<3) 128 #define CERTOPT_USER_RC (1<<4) 129 #define CERTOPT_NO_REQUIRE_USER_PRESENCE (1<<5) 130 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \ 131 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC) 132 static u_int32_t certflags_flags = CERTOPT_DEFAULT; 133 static char *certflags_command = NULL; 134 static char *certflags_src_addr = NULL; 135 136 /* Arbitrary extensions specified by user */ 137 struct cert_ext { 138 char *key; 139 char *val; 140 int crit; 141 }; 142 static struct cert_ext *cert_ext; 143 static size_t ncert_ext; 144 145 /* Conversion to/from various formats */ 146 enum { 147 FMT_RFC4716, 148 FMT_PKCS8, 149 FMT_PEM 150 } convert_format = FMT_RFC4716; 151 152 static char *key_type_name = NULL; 153 154 /* Load key from this PKCS#11 provider */ 155 static char *pkcs11provider = NULL; 156 157 /* FIDO/U2F provider to use */ 158 static char *sk_provider = NULL; 159 160 /* Format for writing private keys */ 161 static int private_key_format = SSHKEY_PRIVATE_OPENSSH; 162 163 /* Cipher for new-format private keys */ 164 static char *openssh_format_cipher = NULL; 165 166 /* Number of KDF rounds to derive new format keys. */ 167 static int rounds = 0; 168 169 /* argv0 */ 170 extern char *__progname; 171 172 static char hostname[NI_MAXHOST]; 173 174 #ifdef WITH_OPENSSL 175 /* moduli.c */ 176 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 177 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long, 178 unsigned long); 179 #endif 180 181 static void 182 type_bits_valid(int type, const char *name, u_int32_t *bitsp) 183 { 184 if (type == KEY_UNSPEC) 185 fatal("unknown key type %s", key_type_name); 186 if (*bitsp == 0) { 187 #ifdef WITH_OPENSSL 188 int nid; 189 190 switch(type) { 191 case KEY_DSA: 192 *bitsp = DEFAULT_BITS_DSA; 193 break; 194 case KEY_ECDSA: 195 if (name != NULL && 196 (nid = sshkey_ecdsa_nid_from_name(name)) > 0) 197 *bitsp = sshkey_curve_nid_to_bits(nid); 198 if (*bitsp == 0) 199 *bitsp = DEFAULT_BITS_ECDSA; 200 break; 201 case KEY_RSA: 202 *bitsp = DEFAULT_BITS; 203 break; 204 } 205 #endif 206 } 207 #ifdef WITH_OPENSSL 208 switch (type) { 209 case KEY_DSA: 210 if (*bitsp != 1024) 211 fatal("Invalid DSA key length: must be 1024 bits"); 212 break; 213 case KEY_RSA: 214 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE) 215 fatal("Invalid RSA key length: minimum is %d bits", 216 SSH_RSA_MINIMUM_MODULUS_SIZE); 217 else if (*bitsp > OPENSSL_RSA_MAX_MODULUS_BITS) 218 fatal("Invalid RSA key length: maximum is %d bits", 219 OPENSSL_RSA_MAX_MODULUS_BITS); 220 break; 221 case KEY_ECDSA: 222 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1) 223 #ifdef OPENSSL_HAS_NISTP521 224 fatal("Invalid ECDSA key length: valid lengths are " 225 "256, 384 or 521 bits"); 226 #else 227 fatal("Invalid ECDSA key length: valid lengths are " 228 "256 or 384 bits"); 229 #endif 230 } 231 #endif 232 } 233 234 /* 235 * Checks whether a file exists and, if so, asks the user whether they wish 236 * to overwrite it. 237 * Returns nonzero if the file does not already exist or if the user agrees to 238 * overwrite, or zero otherwise. 239 */ 240 static int 241 confirm_overwrite(const char *filename) 242 { 243 char yesno[3]; 244 struct stat st; 245 246 if (stat(filename, &st) != 0) 247 return 1; 248 printf("%s already exists.\n", filename); 249 printf("Overwrite (y/n)? "); 250 fflush(stdout); 251 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 252 return 0; 253 if (yesno[0] != 'y' && yesno[0] != 'Y') 254 return 0; 255 return 1; 256 } 257 258 static void 259 ask_filename(struct passwd *pw, const char *prompt) 260 { 261 char buf[1024]; 262 char *name = NULL; 263 264 if (key_type_name == NULL) 265 name = _PATH_SSH_CLIENT_ID_RSA; 266 else { 267 switch (sshkey_type_from_name(key_type_name)) { 268 case KEY_DSA_CERT: 269 case KEY_DSA: 270 name = _PATH_SSH_CLIENT_ID_DSA; 271 break; 272 #ifdef OPENSSL_HAS_ECC 273 case KEY_ECDSA_CERT: 274 case KEY_ECDSA: 275 name = _PATH_SSH_CLIENT_ID_ECDSA; 276 break; 277 case KEY_ECDSA_SK_CERT: 278 case KEY_ECDSA_SK: 279 name = _PATH_SSH_CLIENT_ID_ECDSA_SK; 280 break; 281 #endif 282 case KEY_RSA_CERT: 283 case KEY_RSA: 284 name = _PATH_SSH_CLIENT_ID_RSA; 285 break; 286 case KEY_ED25519: 287 case KEY_ED25519_CERT: 288 name = _PATH_SSH_CLIENT_ID_ED25519; 289 break; 290 case KEY_ED25519_SK: 291 case KEY_ED25519_SK_CERT: 292 name = _PATH_SSH_CLIENT_ID_ED25519_SK; 293 break; 294 case KEY_XMSS: 295 case KEY_XMSS_CERT: 296 name = _PATH_SSH_CLIENT_ID_XMSS; 297 break; 298 default: 299 fatal("bad key type"); 300 } 301 } 302 snprintf(identity_file, sizeof(identity_file), 303 "%s/%s", pw->pw_dir, name); 304 printf("%s (%s): ", prompt, identity_file); 305 fflush(stdout); 306 if (fgets(buf, sizeof(buf), stdin) == NULL) 307 exit(1); 308 buf[strcspn(buf, "\n")] = '\0'; 309 if (strcmp(buf, "") != 0) 310 strlcpy(identity_file, buf, sizeof(identity_file)); 311 have_identity = 1; 312 } 313 314 static struct sshkey * 315 load_identity(const char *filename, char **commentp) 316 { 317 char *pass; 318 struct sshkey *prv; 319 int r; 320 321 if (commentp != NULL) 322 *commentp = NULL; 323 if ((r = sshkey_load_private(filename, "", &prv, commentp)) == 0) 324 return prv; 325 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 326 fatal_r(r, "Load key \"%s\"", filename); 327 if (identity_passphrase) 328 pass = xstrdup(identity_passphrase); 329 else 330 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN); 331 r = sshkey_load_private(filename, pass, &prv, commentp); 332 freezero(pass, strlen(pass)); 333 if (r != 0) 334 fatal_r(r, "Load key \"%s\"", filename); 335 return prv; 336 } 337 338 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 339 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 340 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 341 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 342 343 #ifdef WITH_OPENSSL 344 static void 345 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k) 346 { 347 struct sshbuf *b; 348 char comment[61], *b64; 349 int r; 350 351 if ((b = sshbuf_new()) == NULL) 352 fatal_f("sshbuf_new failed"); 353 if ((r = sshkey_putb(k, b)) != 0) 354 fatal_fr(r, "put key"); 355 if ((b64 = sshbuf_dtob64_string(b, 1)) == NULL) 356 fatal_f("sshbuf_dtob64_string failed"); 357 358 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */ 359 snprintf(comment, sizeof(comment), 360 "%u-bit %s, converted by %s@%s from OpenSSH", 361 sshkey_size(k), sshkey_type(k), 362 pw->pw_name, hostname); 363 364 sshkey_free(k); 365 sshbuf_free(b); 366 367 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 368 fprintf(stdout, "Comment: \"%s\"\n%s", comment, b64); 369 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 370 free(b64); 371 exit(0); 372 } 373 374 static void 375 do_convert_to_pkcs8(struct sshkey *k) 376 { 377 switch (sshkey_type_plain(k->type)) { 378 case KEY_RSA: 379 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa)) 380 fatal("PEM_write_RSA_PUBKEY failed"); 381 break; 382 case KEY_DSA: 383 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 384 fatal("PEM_write_DSA_PUBKEY failed"); 385 break; 386 #ifdef OPENSSL_HAS_ECC 387 case KEY_ECDSA: 388 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 389 fatal("PEM_write_EC_PUBKEY failed"); 390 break; 391 #endif 392 default: 393 fatal_f("unsupported key type %s", sshkey_type(k)); 394 } 395 exit(0); 396 } 397 398 static void 399 do_convert_to_pem(struct sshkey *k) 400 { 401 switch (sshkey_type_plain(k->type)) { 402 case KEY_RSA: 403 if (!PEM_write_RSAPublicKey(stdout, k->rsa)) 404 fatal("PEM_write_RSAPublicKey failed"); 405 break; 406 case KEY_DSA: 407 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa)) 408 fatal("PEM_write_DSA_PUBKEY failed"); 409 break; 410 #ifdef OPENSSL_HAS_ECC 411 case KEY_ECDSA: 412 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa)) 413 fatal("PEM_write_EC_PUBKEY failed"); 414 break; 415 #endif 416 default: 417 fatal_f("unsupported key type %s", sshkey_type(k)); 418 } 419 exit(0); 420 } 421 422 static void 423 do_convert_to(struct passwd *pw) 424 { 425 struct sshkey *k; 426 struct stat st; 427 int r; 428 429 if (!have_identity) 430 ask_filename(pw, "Enter file in which the key is"); 431 if (stat(identity_file, &st) == -1) 432 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 433 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0) 434 k = load_identity(identity_file, NULL); 435 switch (convert_format) { 436 case FMT_RFC4716: 437 do_convert_to_ssh2(pw, k); 438 break; 439 case FMT_PKCS8: 440 do_convert_to_pkcs8(k); 441 break; 442 case FMT_PEM: 443 do_convert_to_pem(k); 444 break; 445 default: 446 fatal_f("unknown key format %d", convert_format); 447 } 448 exit(0); 449 } 450 451 /* 452 * This is almost exactly the bignum1 encoding, but with 32 bit for length 453 * instead of 16. 454 */ 455 static void 456 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value) 457 { 458 u_int bytes, bignum_bits; 459 int r; 460 461 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0) 462 fatal_fr(r, "parse"); 463 bytes = (bignum_bits + 7) / 8; 464 if (sshbuf_len(b) < bytes) 465 fatal_f("input buffer too small: need %d have %zu", 466 bytes, sshbuf_len(b)); 467 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL) 468 fatal_f("BN_bin2bn failed"); 469 if ((r = sshbuf_consume(b, bytes)) != 0) 470 fatal_fr(r, "consume"); 471 } 472 473 static struct sshkey * 474 do_convert_private_ssh2(struct sshbuf *b) 475 { 476 struct sshkey *key = NULL; 477 char *type, *cipher; 478 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345"; 479 int r, rlen, ktype; 480 u_int magic, i1, i2, i3, i4; 481 size_t slen; 482 u_long e; 483 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL; 484 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL; 485 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL; 486 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL; 487 488 if ((r = sshbuf_get_u32(b, &magic)) != 0) 489 fatal_fr(r, "parse magic"); 490 491 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 492 error("bad magic 0x%x != 0x%x", magic, 493 SSH_COM_PRIVATE_KEY_MAGIC); 494 return NULL; 495 } 496 if ((r = sshbuf_get_u32(b, &i1)) != 0 || 497 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 498 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 || 499 (r = sshbuf_get_u32(b, &i2)) != 0 || 500 (r = sshbuf_get_u32(b, &i3)) != 0 || 501 (r = sshbuf_get_u32(b, &i4)) != 0) 502 fatal_fr(r, "parse"); 503 debug("ignore (%d %d %d %d)", i1, i2, i3, i4); 504 if (strcmp(cipher, "none") != 0) { 505 error("unsupported cipher %s", cipher); 506 free(cipher); 507 free(type); 508 return NULL; 509 } 510 free(cipher); 511 512 if (strstr(type, "dsa")) { 513 ktype = KEY_DSA; 514 } else if (strstr(type, "rsa")) { 515 ktype = KEY_RSA; 516 } else { 517 free(type); 518 return NULL; 519 } 520 if ((key = sshkey_new(ktype)) == NULL) 521 fatal("sshkey_new failed"); 522 free(type); 523 524 switch (key->type) { 525 case KEY_DSA: 526 if ((dsa_p = BN_new()) == NULL || 527 (dsa_q = BN_new()) == NULL || 528 (dsa_g = BN_new()) == NULL || 529 (dsa_pub_key = BN_new()) == NULL || 530 (dsa_priv_key = BN_new()) == NULL) 531 fatal_f("BN_new"); 532 buffer_get_bignum_bits(b, dsa_p); 533 buffer_get_bignum_bits(b, dsa_g); 534 buffer_get_bignum_bits(b, dsa_q); 535 buffer_get_bignum_bits(b, dsa_pub_key); 536 buffer_get_bignum_bits(b, dsa_priv_key); 537 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) 538 fatal_f("DSA_set0_pqg failed"); 539 dsa_p = dsa_q = dsa_g = NULL; /* transferred */ 540 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key)) 541 fatal_f("DSA_set0_key failed"); 542 dsa_pub_key = dsa_priv_key = NULL; /* transferred */ 543 break; 544 case KEY_RSA: 545 if ((r = sshbuf_get_u8(b, &e1)) != 0 || 546 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) || 547 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0)) 548 fatal_fr(r, "parse RSA"); 549 e = e1; 550 debug("e %lx", e); 551 if (e < 30) { 552 e <<= 8; 553 e += e2; 554 debug("e %lx", e); 555 e <<= 8; 556 e += e3; 557 debug("e %lx", e); 558 } 559 if ((rsa_e = BN_new()) == NULL) 560 fatal_f("BN_new"); 561 if (!BN_set_word(rsa_e, e)) { 562 BN_clear_free(rsa_e); 563 sshkey_free(key); 564 return NULL; 565 } 566 if ((rsa_n = BN_new()) == NULL || 567 (rsa_d = BN_new()) == NULL || 568 (rsa_p = BN_new()) == NULL || 569 (rsa_q = BN_new()) == NULL || 570 (rsa_iqmp = BN_new()) == NULL) 571 fatal_f("BN_new"); 572 buffer_get_bignum_bits(b, rsa_d); 573 buffer_get_bignum_bits(b, rsa_n); 574 buffer_get_bignum_bits(b, rsa_iqmp); 575 buffer_get_bignum_bits(b, rsa_q); 576 buffer_get_bignum_bits(b, rsa_p); 577 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d)) 578 fatal_f("RSA_set0_key failed"); 579 rsa_n = rsa_e = rsa_d = NULL; /* transferred */ 580 if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q)) 581 fatal_f("RSA_set0_factors failed"); 582 rsa_p = rsa_q = NULL; /* transferred */ 583 if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0) 584 fatal_fr(r, "generate RSA parameters"); 585 BN_clear_free(rsa_iqmp); 586 break; 587 } 588 rlen = sshbuf_len(b); 589 if (rlen != 0) 590 error_f("remaining bytes in key blob %d", rlen); 591 592 /* try the key */ 593 if (sshkey_sign(key, &sig, &slen, data, sizeof(data), 594 NULL, NULL, NULL, 0) != 0 || 595 sshkey_verify(key, sig, slen, data, sizeof(data), 596 NULL, 0, NULL) != 0) { 597 sshkey_free(key); 598 free(sig); 599 return NULL; 600 } 601 free(sig); 602 return key; 603 } 604 605 static int 606 get_line(FILE *fp, char *line, size_t len) 607 { 608 int c; 609 size_t pos = 0; 610 611 line[0] = '\0'; 612 while ((c = fgetc(fp)) != EOF) { 613 if (pos >= len - 1) 614 fatal("input line too long."); 615 switch (c) { 616 case '\r': 617 c = fgetc(fp); 618 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) 619 fatal("unget: %s", strerror(errno)); 620 return pos; 621 case '\n': 622 return pos; 623 } 624 line[pos++] = c; 625 line[pos] = '\0'; 626 } 627 /* We reached EOF */ 628 return -1; 629 } 630 631 static void 632 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private) 633 { 634 int r, blen, escaped = 0; 635 u_int len; 636 char line[1024]; 637 struct sshbuf *buf; 638 char encoded[8096]; 639 FILE *fp; 640 641 if ((buf = sshbuf_new()) == NULL) 642 fatal("sshbuf_new failed"); 643 if ((fp = fopen(identity_file, "r")) == NULL) 644 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 645 encoded[0] = '\0'; 646 while ((blen = get_line(fp, line, sizeof(line))) != -1) { 647 if (blen > 0 && line[blen - 1] == '\\') 648 escaped++; 649 if (strncmp(line, "----", 4) == 0 || 650 strstr(line, ": ") != NULL) { 651 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 652 *private = 1; 653 if (strstr(line, " END ") != NULL) { 654 break; 655 } 656 /* fprintf(stderr, "ignore: %s", line); */ 657 continue; 658 } 659 if (escaped) { 660 escaped--; 661 /* fprintf(stderr, "escaped: %s", line); */ 662 continue; 663 } 664 strlcat(encoded, line, sizeof(encoded)); 665 } 666 len = strlen(encoded); 667 if (((len % 4) == 3) && 668 (encoded[len-1] == '=') && 669 (encoded[len-2] == '=') && 670 (encoded[len-3] == '=')) 671 encoded[len-3] = '\0'; 672 if ((r = sshbuf_b64tod(buf, encoded)) != 0) 673 fatal_fr(r, "base64 decode"); 674 if (*private) { 675 if ((*k = do_convert_private_ssh2(buf)) == NULL) 676 fatal_f("private key conversion failed"); 677 } else if ((r = sshkey_fromb(buf, k)) != 0) 678 fatal_fr(r, "parse key"); 679 sshbuf_free(buf); 680 fclose(fp); 681 } 682 683 static void 684 do_convert_from_pkcs8(struct sshkey **k, int *private) 685 { 686 EVP_PKEY *pubkey; 687 FILE *fp; 688 689 if ((fp = fopen(identity_file, "r")) == NULL) 690 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 691 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) { 692 fatal_f("%s is not a recognised public key format", 693 identity_file); 694 } 695 fclose(fp); 696 switch (EVP_PKEY_base_id(pubkey)) { 697 case EVP_PKEY_RSA: 698 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 699 fatal("sshkey_new failed"); 700 (*k)->type = KEY_RSA; 701 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey); 702 break; 703 case EVP_PKEY_DSA: 704 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 705 fatal("sshkey_new failed"); 706 (*k)->type = KEY_DSA; 707 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey); 708 break; 709 #ifdef OPENSSL_HAS_ECC 710 case EVP_PKEY_EC: 711 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 712 fatal("sshkey_new failed"); 713 (*k)->type = KEY_ECDSA; 714 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey); 715 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa); 716 break; 717 #endif 718 default: 719 fatal_f("unsupported pubkey type %d", 720 EVP_PKEY_base_id(pubkey)); 721 } 722 EVP_PKEY_free(pubkey); 723 return; 724 } 725 726 static void 727 do_convert_from_pem(struct sshkey **k, int *private) 728 { 729 FILE *fp; 730 RSA *rsa; 731 732 if ((fp = fopen(identity_file, "r")) == NULL) 733 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 734 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) { 735 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL) 736 fatal("sshkey_new failed"); 737 (*k)->type = KEY_RSA; 738 (*k)->rsa = rsa; 739 fclose(fp); 740 return; 741 } 742 fatal_f("unrecognised raw private key format"); 743 } 744 745 static void 746 do_convert_from(struct passwd *pw) 747 { 748 struct sshkey *k = NULL; 749 int r, private = 0, ok = 0; 750 struct stat st; 751 752 if (!have_identity) 753 ask_filename(pw, "Enter file in which the key is"); 754 if (stat(identity_file, &st) == -1) 755 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 756 757 switch (convert_format) { 758 case FMT_RFC4716: 759 do_convert_from_ssh2(pw, &k, &private); 760 break; 761 case FMT_PKCS8: 762 do_convert_from_pkcs8(&k, &private); 763 break; 764 case FMT_PEM: 765 do_convert_from_pem(&k, &private); 766 break; 767 default: 768 fatal_f("unknown key format %d", convert_format); 769 } 770 771 if (!private) { 772 if ((r = sshkey_write(k, stdout)) == 0) 773 ok = 1; 774 if (ok) 775 fprintf(stdout, "\n"); 776 } else { 777 switch (k->type) { 778 case KEY_DSA: 779 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, 780 NULL, 0, NULL, NULL); 781 break; 782 #ifdef OPENSSL_HAS_ECC 783 case KEY_ECDSA: 784 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL, 785 NULL, 0, NULL, NULL); 786 break; 787 #endif 788 case KEY_RSA: 789 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, 790 NULL, 0, NULL, NULL); 791 break; 792 default: 793 fatal_f("unsupported key type %s", sshkey_type(k)); 794 } 795 } 796 797 if (!ok) 798 fatal("key write failed"); 799 sshkey_free(k); 800 exit(0); 801 } 802 #endif 803 804 static void 805 do_print_public(struct passwd *pw) 806 { 807 struct sshkey *prv; 808 struct stat st; 809 int r; 810 char *comment = NULL; 811 812 if (!have_identity) 813 ask_filename(pw, "Enter file in which the key is"); 814 if (stat(identity_file, &st) == -1) 815 fatal("%s: %s", identity_file, strerror(errno)); 816 prv = load_identity(identity_file, &comment); 817 if ((r = sshkey_write(prv, stdout)) != 0) 818 fatal_fr(r, "write key"); 819 if (comment != NULL && *comment != '\0') 820 fprintf(stdout, " %s", comment); 821 fprintf(stdout, "\n"); 822 if (sshkey_is_sk(prv)) { 823 debug("sk_application: \"%s\", sk_flags 0x%02x", 824 prv->sk_application, prv->sk_flags); 825 } 826 sshkey_free(prv); 827 free(comment); 828 exit(0); 829 } 830 831 static void 832 do_download(struct passwd *pw) 833 { 834 #ifdef ENABLE_PKCS11 835 struct sshkey **keys = NULL; 836 int i, nkeys; 837 enum sshkey_fp_rep rep; 838 int fptype; 839 char *fp, *ra, **comments = NULL; 840 841 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 842 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 843 844 pkcs11_init(1); 845 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys, &comments); 846 if (nkeys <= 0) 847 fatal("cannot read public key from pkcs11"); 848 for (i = 0; i < nkeys; i++) { 849 if (print_fingerprint) { 850 fp = sshkey_fingerprint(keys[i], fptype, rep); 851 ra = sshkey_fingerprint(keys[i], fingerprint_hash, 852 SSH_FP_RANDOMART); 853 if (fp == NULL || ra == NULL) 854 fatal_f("sshkey_fingerprint fail"); 855 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]), 856 fp, sshkey_type(keys[i])); 857 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 858 printf("%s\n", ra); 859 free(ra); 860 free(fp); 861 } else { 862 (void) sshkey_write(keys[i], stdout); /* XXX check */ 863 fprintf(stdout, "%s%s\n", 864 *(comments[i]) == '\0' ? "" : " ", comments[i]); 865 } 866 free(comments[i]); 867 sshkey_free(keys[i]); 868 } 869 free(comments); 870 free(keys); 871 pkcs11_terminate(); 872 exit(0); 873 #else 874 fatal("no pkcs11 support"); 875 #endif /* ENABLE_PKCS11 */ 876 } 877 878 static struct sshkey * 879 try_read_key(char **cpp) 880 { 881 struct sshkey *ret; 882 int r; 883 884 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL) 885 fatal("sshkey_new failed"); 886 if ((r = sshkey_read(ret, cpp)) == 0) 887 return ret; 888 /* Not a key */ 889 sshkey_free(ret); 890 return NULL; 891 } 892 893 static void 894 fingerprint_one_key(const struct sshkey *public, const char *comment) 895 { 896 char *fp = NULL, *ra = NULL; 897 enum sshkey_fp_rep rep; 898 int fptype; 899 900 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 901 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 902 fp = sshkey_fingerprint(public, fptype, rep); 903 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART); 904 if (fp == NULL || ra == NULL) 905 fatal_f("sshkey_fingerprint failed"); 906 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp, 907 comment ? comment : "no comment", sshkey_type(public)); 908 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 909 printf("%s\n", ra); 910 free(ra); 911 free(fp); 912 } 913 914 static void 915 fingerprint_private(const char *path) 916 { 917 struct stat st; 918 char *comment = NULL; 919 struct sshkey *privkey = NULL, *pubkey = NULL; 920 int r; 921 922 if (stat(identity_file, &st) == -1) 923 fatal("%s: %s", path, strerror(errno)); 924 if ((r = sshkey_load_public(path, &pubkey, &comment)) != 0) 925 debug_r(r, "load public \"%s\"", path); 926 if (pubkey == NULL || comment == NULL || *comment == '\0') { 927 free(comment); 928 if ((r = sshkey_load_private(path, NULL, 929 &privkey, &comment)) != 0) 930 debug_r(r, "load private \"%s\"", path); 931 } 932 if (pubkey == NULL && privkey == NULL) 933 fatal("%s is not a key file.", path); 934 935 fingerprint_one_key(pubkey == NULL ? privkey : pubkey, comment); 936 sshkey_free(pubkey); 937 sshkey_free(privkey); 938 free(comment); 939 } 940 941 static void 942 do_fingerprint(struct passwd *pw) 943 { 944 FILE *f; 945 struct sshkey *public = NULL; 946 char *comment = NULL, *cp, *ep, *line = NULL; 947 size_t linesize = 0; 948 int i, invalid = 1; 949 const char *path; 950 u_long lnum = 0; 951 952 if (!have_identity) 953 ask_filename(pw, "Enter file in which the key is"); 954 path = identity_file; 955 956 if (strcmp(identity_file, "-") == 0) { 957 f = stdin; 958 path = "(stdin)"; 959 } else if ((f = fopen(path, "r")) == NULL) 960 fatal("%s: %s: %s", __progname, path, strerror(errno)); 961 962 while (getline(&line, &linesize, f) != -1) { 963 lnum++; 964 cp = line; 965 cp[strcspn(cp, "\n")] = '\0'; 966 /* Trim leading space and comments */ 967 cp = line + strspn(line, " \t"); 968 if (*cp == '#' || *cp == '\0') 969 continue; 970 971 /* 972 * Input may be plain keys, private keys, authorized_keys 973 * or known_hosts. 974 */ 975 976 /* 977 * Try private keys first. Assume a key is private if 978 * "SSH PRIVATE KEY" appears on the first line and we're 979 * not reading from stdin (XXX support private keys on stdin). 980 */ 981 if (lnum == 1 && strcmp(identity_file, "-") != 0 && 982 strstr(cp, "PRIVATE KEY") != NULL) { 983 free(line); 984 fclose(f); 985 fingerprint_private(path); 986 exit(0); 987 } 988 989 /* 990 * If it's not a private key, then this must be prepared to 991 * accept a public key prefixed with a hostname or options. 992 * Try a bare key first, otherwise skip the leading stuff. 993 */ 994 if ((public = try_read_key(&cp)) == NULL) { 995 i = strtol(cp, &ep, 10); 996 if (i == 0 || ep == NULL || 997 (*ep != ' ' && *ep != '\t')) { 998 int quoted = 0; 999 1000 comment = cp; 1001 for (; *cp && (quoted || (*cp != ' ' && 1002 *cp != '\t')); cp++) { 1003 if (*cp == '\\' && cp[1] == '"') 1004 cp++; /* Skip both */ 1005 else if (*cp == '"') 1006 quoted = !quoted; 1007 } 1008 if (!*cp) 1009 continue; 1010 *cp++ = '\0'; 1011 } 1012 } 1013 /* Retry after parsing leading hostname/key options */ 1014 if (public == NULL && (public = try_read_key(&cp)) == NULL) { 1015 debug("%s:%lu: not a public key", path, lnum); 1016 continue; 1017 } 1018 1019 /* Find trailing comment, if any */ 1020 for (; *cp == ' ' || *cp == '\t'; cp++) 1021 ; 1022 if (*cp != '\0' && *cp != '#') 1023 comment = cp; 1024 1025 fingerprint_one_key(public, comment); 1026 sshkey_free(public); 1027 invalid = 0; /* One good key in the file is sufficient */ 1028 } 1029 fclose(f); 1030 free(line); 1031 1032 if (invalid) 1033 fatal("%s is not a public key file.", path); 1034 exit(0); 1035 } 1036 1037 static void 1038 do_gen_all_hostkeys(struct passwd *pw) 1039 { 1040 struct { 1041 char *key_type; 1042 char *key_type_display; 1043 char *path; 1044 } key_types[] = { 1045 #ifdef WITH_OPENSSL 1046 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE }, 1047 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE }, 1048 #ifdef OPENSSL_HAS_ECC 1049 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE }, 1050 #endif /* OPENSSL_HAS_ECC */ 1051 #endif /* WITH_OPENSSL */ 1052 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE }, 1053 #ifdef WITH_XMSS 1054 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE }, 1055 #endif /* WITH_XMSS */ 1056 { NULL, NULL, NULL } 1057 }; 1058 1059 u_int32_t bits = 0; 1060 int first = 0; 1061 struct stat st; 1062 struct sshkey *private, *public; 1063 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file; 1064 int i, type, fd, r; 1065 1066 for (i = 0; key_types[i].key_type; i++) { 1067 public = private = NULL; 1068 prv_tmp = pub_tmp = prv_file = pub_file = NULL; 1069 1070 xasprintf(&prv_file, "%s%s", 1071 identity_file, key_types[i].path); 1072 1073 /* Check whether private key exists and is not zero-length */ 1074 if (stat(prv_file, &st) == 0) { 1075 if (st.st_size != 0) 1076 goto next; 1077 } else if (errno != ENOENT) { 1078 error("Could not stat %s: %s", key_types[i].path, 1079 strerror(errno)); 1080 goto failnext; 1081 } 1082 1083 /* 1084 * Private key doesn't exist or is invalid; proceed with 1085 * key generation. 1086 */ 1087 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX", 1088 identity_file, key_types[i].path); 1089 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX", 1090 identity_file, key_types[i].path); 1091 xasprintf(&pub_file, "%s%s.pub", 1092 identity_file, key_types[i].path); 1093 1094 if (first == 0) { 1095 first = 1; 1096 printf("%s: generating new host keys: ", __progname); 1097 } 1098 printf("%s ", key_types[i].key_type_display); 1099 fflush(stdout); 1100 type = sshkey_type_from_name(key_types[i].key_type); 1101 if ((fd = mkstemp(prv_tmp)) == -1) { 1102 error("Could not save your private key in %s: %s", 1103 prv_tmp, strerror(errno)); 1104 goto failnext; 1105 } 1106 (void)close(fd); /* just using mkstemp() to reserve a name */ 1107 bits = 0; 1108 type_bits_valid(type, NULL, &bits); 1109 if ((r = sshkey_generate(type, bits, &private)) != 0) { 1110 error_r(r, "sshkey_generate failed"); 1111 goto failnext; 1112 } 1113 if ((r = sshkey_from_private(private, &public)) != 0) 1114 fatal_fr(r, "sshkey_from_private"); 1115 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, 1116 hostname); 1117 if ((r = sshkey_save_private(private, prv_tmp, "", 1118 comment, private_key_format, openssh_format_cipher, 1119 rounds)) != 0) { 1120 error_r(r, "Saving key \"%s\" failed", prv_tmp); 1121 goto failnext; 1122 } 1123 if ((fd = mkstemp(pub_tmp)) == -1) { 1124 error("Could not save your public key in %s: %s", 1125 pub_tmp, strerror(errno)); 1126 goto failnext; 1127 } 1128 (void)fchmod(fd, 0644); 1129 (void)close(fd); 1130 if ((r = sshkey_save_public(public, pub_tmp, comment)) != 0) { 1131 error_r(r, "Unable to save public key to %s", 1132 identity_file); 1133 goto failnext; 1134 } 1135 1136 /* Rename temporary files to their permanent locations. */ 1137 if (rename(pub_tmp, pub_file) != 0) { 1138 error("Unable to move %s into position: %s", 1139 pub_file, strerror(errno)); 1140 goto failnext; 1141 } 1142 if (rename(prv_tmp, prv_file) != 0) { 1143 error("Unable to move %s into position: %s", 1144 key_types[i].path, strerror(errno)); 1145 failnext: 1146 first = 0; 1147 goto next; 1148 } 1149 next: 1150 sshkey_free(private); 1151 sshkey_free(public); 1152 free(prv_tmp); 1153 free(pub_tmp); 1154 free(prv_file); 1155 free(pub_file); 1156 } 1157 if (first != 0) 1158 printf("\n"); 1159 } 1160 1161 struct known_hosts_ctx { 1162 const char *host; /* Hostname searched for in find/delete case */ 1163 FILE *out; /* Output file, stdout for find_hosts case */ 1164 int has_unhashed; /* When hashing, original had unhashed hosts */ 1165 int found_key; /* For find/delete, host was found */ 1166 int invalid; /* File contained invalid items; don't delete */ 1167 int hash_hosts; /* Hash hostnames as we go */ 1168 int find_host; /* Search for specific hostname */ 1169 int delete_host; /* Delete host from known_hosts */ 1170 }; 1171 1172 static int 1173 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx) 1174 { 1175 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1176 char *hashed, *cp, *hosts, *ohosts; 1177 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts); 1178 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM; 1179 1180 switch (l->status) { 1181 case HKF_STATUS_OK: 1182 case HKF_STATUS_MATCHED: 1183 /* 1184 * Don't hash hosts already already hashed, with wildcard 1185 * characters or a CA/revocation marker. 1186 */ 1187 if (was_hashed || has_wild || l->marker != MRK_NONE) { 1188 fprintf(ctx->out, "%s\n", l->line); 1189 if (has_wild && !ctx->find_host) { 1190 logit("%s:%lu: ignoring host name " 1191 "with wildcard: %.64s", l->path, 1192 l->linenum, l->hosts); 1193 } 1194 return 0; 1195 } 1196 /* 1197 * Split any comma-separated hostnames from the host list, 1198 * hash and store separately. 1199 */ 1200 ohosts = hosts = xstrdup(l->hosts); 1201 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') { 1202 lowercase(cp); 1203 if ((hashed = host_hash(cp, NULL, 0)) == NULL) 1204 fatal("hash_host failed"); 1205 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey); 1206 free(hashed); 1207 ctx->has_unhashed = 1; 1208 } 1209 free(ohosts); 1210 return 0; 1211 case HKF_STATUS_INVALID: 1212 /* Retain invalid lines, but mark file as invalid. */ 1213 ctx->invalid = 1; 1214 logit("%s:%lu: invalid line", l->path, l->linenum); 1215 /* FALLTHROUGH */ 1216 default: 1217 fprintf(ctx->out, "%s\n", l->line); 1218 return 0; 1219 } 1220 /* NOTREACHED */ 1221 return -1; 1222 } 1223 1224 static int 1225 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx) 1226 { 1227 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx; 1228 enum sshkey_fp_rep rep; 1229 int fptype; 1230 char *fp = NULL, *ra = NULL; 1231 1232 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash; 1233 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT; 1234 1235 if (l->status == HKF_STATUS_MATCHED) { 1236 if (ctx->delete_host) { 1237 if (l->marker != MRK_NONE) { 1238 /* Don't remove CA and revocation lines */ 1239 fprintf(ctx->out, "%s\n", l->line); 1240 } else { 1241 /* 1242 * Hostname matches and has no CA/revoke 1243 * marker, delete it by *not* writing the 1244 * line to ctx->out. 1245 */ 1246 ctx->found_key = 1; 1247 if (!quiet) 1248 printf("# Host %s found: line %lu\n", 1249 ctx->host, l->linenum); 1250 } 1251 return 0; 1252 } else if (ctx->find_host) { 1253 ctx->found_key = 1; 1254 if (!quiet) { 1255 printf("# Host %s found: line %lu %s\n", 1256 ctx->host, 1257 l->linenum, l->marker == MRK_CA ? "CA" : 1258 (l->marker == MRK_REVOKE ? "REVOKED" : "")); 1259 } 1260 if (ctx->hash_hosts) 1261 known_hosts_hash(l, ctx); 1262 else if (print_fingerprint) { 1263 fp = sshkey_fingerprint(l->key, fptype, rep); 1264 ra = sshkey_fingerprint(l->key, 1265 fingerprint_hash, SSH_FP_RANDOMART); 1266 if (fp == NULL || ra == NULL) 1267 fatal_f("sshkey_fingerprint failed"); 1268 mprintf("%s %s %s%s%s\n", ctx->host, 1269 sshkey_type(l->key), fp, 1270 l->comment[0] ? " " : "", 1271 l->comment); 1272 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE) 1273 printf("%s\n", ra); 1274 free(ra); 1275 free(fp); 1276 } else 1277 fprintf(ctx->out, "%s\n", l->line); 1278 return 0; 1279 } 1280 } else if (ctx->delete_host) { 1281 /* Retain non-matching hosts when deleting */ 1282 if (l->status == HKF_STATUS_INVALID) { 1283 ctx->invalid = 1; 1284 logit("%s:%lu: invalid line", l->path, l->linenum); 1285 } 1286 fprintf(ctx->out, "%s\n", l->line); 1287 } 1288 return 0; 1289 } 1290 1291 static void 1292 do_known_hosts(struct passwd *pw, const char *name, int find_host, 1293 int delete_host, int hash_hosts) 1294 { 1295 char *cp, tmp[PATH_MAX], old[PATH_MAX]; 1296 int r, fd, oerrno, inplace = 0; 1297 struct known_hosts_ctx ctx; 1298 u_int foreach_options; 1299 struct stat sb; 1300 1301 if (!have_identity) { 1302 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 1303 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 1304 sizeof(identity_file)) 1305 fatal("Specified known hosts path too long"); 1306 free(cp); 1307 have_identity = 1; 1308 } 1309 if (stat(identity_file, &sb) != 0) 1310 fatal("Cannot stat %s: %s", identity_file, strerror(errno)); 1311 1312 memset(&ctx, 0, sizeof(ctx)); 1313 ctx.out = stdout; 1314 ctx.host = name; 1315 ctx.hash_hosts = hash_hosts; 1316 ctx.find_host = find_host; 1317 ctx.delete_host = delete_host; 1318 1319 /* 1320 * Find hosts goes to stdout, hash and deletions happen in-place 1321 * A corner case is ssh-keygen -HF foo, which should go to stdout 1322 */ 1323 if (!find_host && (hash_hosts || delete_host)) { 1324 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 1325 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 1326 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 1327 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 1328 fatal("known_hosts path too long"); 1329 umask(077); 1330 if ((fd = mkstemp(tmp)) == -1) 1331 fatal("mkstemp: %s", strerror(errno)); 1332 if ((ctx.out = fdopen(fd, "w")) == NULL) { 1333 oerrno = errno; 1334 unlink(tmp); 1335 fatal("fdopen: %s", strerror(oerrno)); 1336 } 1337 fchmod(fd, sb.st_mode & 0644); 1338 inplace = 1; 1339 } 1340 /* XXX support identity_file == "-" for stdin */ 1341 foreach_options = find_host ? HKF_WANT_MATCH : 0; 1342 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0; 1343 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ? 1344 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL, 1345 foreach_options, 0)) != 0) { 1346 if (inplace) 1347 unlink(tmp); 1348 fatal_fr(r, "hostkeys_foreach"); 1349 } 1350 1351 if (inplace) 1352 fclose(ctx.out); 1353 1354 if (ctx.invalid) { 1355 error("%s is not a valid known_hosts file.", identity_file); 1356 if (inplace) { 1357 error("Not replacing existing known_hosts " 1358 "file because of errors"); 1359 unlink(tmp); 1360 } 1361 exit(1); 1362 } else if (delete_host && !ctx.found_key) { 1363 logit("Host %s not found in %s", name, identity_file); 1364 if (inplace) 1365 unlink(tmp); 1366 } else if (inplace) { 1367 /* Backup existing file */ 1368 if (unlink(old) == -1 && errno != ENOENT) 1369 fatal("unlink %.100s: %s", old, strerror(errno)); 1370 if (link(identity_file, old) == -1) 1371 fatal("link %.100s to %.100s: %s", identity_file, old, 1372 strerror(errno)); 1373 /* Move new one into place */ 1374 if (rename(tmp, identity_file) == -1) { 1375 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 1376 strerror(errno)); 1377 unlink(tmp); 1378 unlink(old); 1379 exit(1); 1380 } 1381 1382 printf("%s updated.\n", identity_file); 1383 printf("Original contents retained as %s\n", old); 1384 if (ctx.has_unhashed) { 1385 logit("WARNING: %s contains unhashed entries", old); 1386 logit("Delete this file to ensure privacy " 1387 "of hostnames"); 1388 } 1389 } 1390 1391 exit (find_host && !ctx.found_key); 1392 } 1393 1394 /* 1395 * Perform changing a passphrase. The argument is the passwd structure 1396 * for the current user. 1397 */ 1398 static void 1399 do_change_passphrase(struct passwd *pw) 1400 { 1401 char *comment; 1402 char *old_passphrase, *passphrase1, *passphrase2; 1403 struct stat st; 1404 struct sshkey *private; 1405 int r; 1406 1407 if (!have_identity) 1408 ask_filename(pw, "Enter file in which the key is"); 1409 if (stat(identity_file, &st) == -1) 1410 fatal("%s: %s", identity_file, strerror(errno)); 1411 /* Try to load the file with empty passphrase. */ 1412 r = sshkey_load_private(identity_file, "", &private, &comment); 1413 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) { 1414 if (identity_passphrase) 1415 old_passphrase = xstrdup(identity_passphrase); 1416 else 1417 old_passphrase = 1418 read_passphrase("Enter old passphrase: ", 1419 RP_ALLOW_STDIN); 1420 r = sshkey_load_private(identity_file, old_passphrase, 1421 &private, &comment); 1422 freezero(old_passphrase, strlen(old_passphrase)); 1423 if (r != 0) 1424 goto badkey; 1425 } else if (r != 0) { 1426 badkey: 1427 fatal_r(r, "Failed to load key %s", identity_file); 1428 } 1429 if (comment) 1430 mprintf("Key has comment '%s'\n", comment); 1431 1432 /* Ask the new passphrase (twice). */ 1433 if (identity_new_passphrase) { 1434 passphrase1 = xstrdup(identity_new_passphrase); 1435 passphrase2 = NULL; 1436 } else { 1437 passphrase1 = 1438 read_passphrase("Enter new passphrase (empty for no " 1439 "passphrase): ", RP_ALLOW_STDIN); 1440 passphrase2 = read_passphrase("Enter same passphrase again: ", 1441 RP_ALLOW_STDIN); 1442 1443 /* Verify that they are the same. */ 1444 if (strcmp(passphrase1, passphrase2) != 0) { 1445 explicit_bzero(passphrase1, strlen(passphrase1)); 1446 explicit_bzero(passphrase2, strlen(passphrase2)); 1447 free(passphrase1); 1448 free(passphrase2); 1449 printf("Pass phrases do not match. Try again.\n"); 1450 exit(1); 1451 } 1452 /* Destroy the other copy. */ 1453 freezero(passphrase2, strlen(passphrase2)); 1454 } 1455 1456 /* Save the file using the new passphrase. */ 1457 if ((r = sshkey_save_private(private, identity_file, passphrase1, 1458 comment, private_key_format, openssh_format_cipher, rounds)) != 0) { 1459 error_r(r, "Saving key \"%s\" failed", identity_file); 1460 freezero(passphrase1, strlen(passphrase1)); 1461 sshkey_free(private); 1462 free(comment); 1463 exit(1); 1464 } 1465 /* Destroy the passphrase and the copy of the key in memory. */ 1466 freezero(passphrase1, strlen(passphrase1)); 1467 sshkey_free(private); /* Destroys contents */ 1468 free(comment); 1469 1470 printf("Your identification has been saved with the new passphrase.\n"); 1471 exit(0); 1472 } 1473 1474 /* 1475 * Print the SSHFP RR. 1476 */ 1477 static int 1478 do_print_resource_record(struct passwd *pw, char *fname, char *hname, 1479 int print_generic) 1480 { 1481 struct sshkey *public; 1482 char *comment = NULL; 1483 struct stat st; 1484 int r; 1485 1486 if (fname == NULL) 1487 fatal_f("no filename"); 1488 if (stat(fname, &st) == -1) { 1489 if (errno == ENOENT) 1490 return 0; 1491 fatal("%s: %s", fname, strerror(errno)); 1492 } 1493 if ((r = sshkey_load_public(fname, &public, &comment)) != 0) 1494 fatal_r(r, "Failed to read v2 public key from \"%s\"", fname); 1495 export_dns_rr(hname, public, stdout, print_generic); 1496 sshkey_free(public); 1497 free(comment); 1498 return 1; 1499 } 1500 1501 /* 1502 * Change the comment of a private key file. 1503 */ 1504 static void 1505 do_change_comment(struct passwd *pw, const char *identity_comment) 1506 { 1507 char new_comment[1024], *comment, *passphrase; 1508 struct sshkey *private; 1509 struct sshkey *public; 1510 struct stat st; 1511 int r; 1512 1513 if (!have_identity) 1514 ask_filename(pw, "Enter file in which the key is"); 1515 if (stat(identity_file, &st) == -1) 1516 fatal("%s: %s", identity_file, strerror(errno)); 1517 if ((r = sshkey_load_private(identity_file, "", 1518 &private, &comment)) == 0) 1519 passphrase = xstrdup(""); 1520 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 1521 fatal_r(r, "Cannot load private key \"%s\"", identity_file); 1522 else { 1523 if (identity_passphrase) 1524 passphrase = xstrdup(identity_passphrase); 1525 else if (identity_new_passphrase) 1526 passphrase = xstrdup(identity_new_passphrase); 1527 else 1528 passphrase = read_passphrase("Enter passphrase: ", 1529 RP_ALLOW_STDIN); 1530 /* Try to load using the passphrase. */ 1531 if ((r = sshkey_load_private(identity_file, passphrase, 1532 &private, &comment)) != 0) { 1533 freezero(passphrase, strlen(passphrase)); 1534 fatal_r(r, "Cannot load private key \"%s\"", 1535 identity_file); 1536 } 1537 } 1538 1539 if (private->type != KEY_ED25519 && private->type != KEY_XMSS && 1540 private_key_format != SSHKEY_PRIVATE_OPENSSH) { 1541 error("Comments are only supported for keys stored in " 1542 "the new format (-o)."); 1543 explicit_bzero(passphrase, strlen(passphrase)); 1544 sshkey_free(private); 1545 exit(1); 1546 } 1547 if (comment) 1548 printf("Old comment: %s\n", comment); 1549 else 1550 printf("No existing comment\n"); 1551 1552 if (identity_comment) { 1553 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 1554 } else { 1555 printf("New comment: "); 1556 fflush(stdout); 1557 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 1558 explicit_bzero(passphrase, strlen(passphrase)); 1559 sshkey_free(private); 1560 exit(1); 1561 } 1562 new_comment[strcspn(new_comment, "\n")] = '\0'; 1563 } 1564 if (comment != NULL && strcmp(comment, new_comment) == 0) { 1565 printf("No change to comment\n"); 1566 free(passphrase); 1567 sshkey_free(private); 1568 free(comment); 1569 exit(0); 1570 } 1571 1572 /* Save the file using the new passphrase. */ 1573 if ((r = sshkey_save_private(private, identity_file, passphrase, 1574 new_comment, private_key_format, openssh_format_cipher, 1575 rounds)) != 0) { 1576 error_r(r, "Saving key \"%s\" failed", identity_file); 1577 freezero(passphrase, strlen(passphrase)); 1578 sshkey_free(private); 1579 free(comment); 1580 exit(1); 1581 } 1582 freezero(passphrase, strlen(passphrase)); 1583 if ((r = sshkey_from_private(private, &public)) != 0) 1584 fatal_fr(r, "sshkey_from_private"); 1585 sshkey_free(private); 1586 1587 strlcat(identity_file, ".pub", sizeof(identity_file)); 1588 if ((r = sshkey_save_public(public, identity_file, new_comment)) != 0) 1589 fatal_r(r, "Unable to save public key to %s", identity_file); 1590 sshkey_free(public); 1591 free(comment); 1592 1593 if (strlen(new_comment) > 0) 1594 printf("Comment '%s' applied\n", new_comment); 1595 else 1596 printf("Comment removed\n"); 1597 1598 exit(0); 1599 } 1600 1601 static void 1602 cert_ext_add(const char *key, const char *value, int iscrit) 1603 { 1604 cert_ext = xreallocarray(cert_ext, ncert_ext + 1, sizeof(*cert_ext)); 1605 cert_ext[ncert_ext].key = xstrdup(key); 1606 cert_ext[ncert_ext].val = value == NULL ? NULL : xstrdup(value); 1607 cert_ext[ncert_ext].crit = iscrit; 1608 ncert_ext++; 1609 } 1610 1611 /* qsort(3) comparison function for certificate extensions */ 1612 static int 1613 cert_ext_cmp(const void *_a, const void *_b) 1614 { 1615 const struct cert_ext *a = (const struct cert_ext *)_a; 1616 const struct cert_ext *b = (const struct cert_ext *)_b; 1617 int r; 1618 1619 if (a->crit != b->crit) 1620 return (a->crit < b->crit) ? -1 : 1; 1621 if ((r = strcmp(a->key, b->key)) != 0) 1622 return r; 1623 if ((a->val == NULL) != (b->val == NULL)) 1624 return (a->val == NULL) ? -1 : 1; 1625 if (a->val != NULL && (r = strcmp(a->val, b->val)) != 0) 1626 return r; 1627 return 0; 1628 } 1629 1630 #define OPTIONS_CRITICAL 1 1631 #define OPTIONS_EXTENSIONS 2 1632 static void 1633 prepare_options_buf(struct sshbuf *c, int which) 1634 { 1635 struct sshbuf *b; 1636 size_t i; 1637 int r; 1638 const struct cert_ext *ext; 1639 1640 if ((b = sshbuf_new()) == NULL) 1641 fatal_f("sshbuf_new failed"); 1642 sshbuf_reset(c); 1643 for (i = 0; i < ncert_ext; i++) { 1644 ext = &cert_ext[i]; 1645 if ((ext->crit && (which & OPTIONS_EXTENSIONS)) || 1646 (!ext->crit && (which & OPTIONS_CRITICAL))) 1647 continue; 1648 if (ext->val == NULL) { 1649 /* flag option */ 1650 debug3_f("%s", ext->key); 1651 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 || 1652 (r = sshbuf_put_string(c, NULL, 0)) != 0) 1653 fatal_fr(r, "prepare flag"); 1654 } else { 1655 /* key/value option */ 1656 debug3_f("%s=%s", ext->key, ext->val); 1657 sshbuf_reset(b); 1658 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 || 1659 (r = sshbuf_put_cstring(b, ext->val)) != 0 || 1660 (r = sshbuf_put_stringb(c, b)) != 0) 1661 fatal_fr(r, "prepare k/v"); 1662 } 1663 } 1664 sshbuf_free(b); 1665 } 1666 1667 static void 1668 finalise_cert_exts(void) 1669 { 1670 /* critical options */ 1671 if (certflags_command != NULL) 1672 cert_ext_add("force-command", certflags_command, 1); 1673 if (certflags_src_addr != NULL) 1674 cert_ext_add("source-address", certflags_src_addr, 1); 1675 /* extensions */ 1676 if ((certflags_flags & CERTOPT_X_FWD) != 0) 1677 cert_ext_add("permit-X11-forwarding", NULL, 0); 1678 if ((certflags_flags & CERTOPT_AGENT_FWD) != 0) 1679 cert_ext_add("permit-agent-forwarding", NULL, 0); 1680 if ((certflags_flags & CERTOPT_PORT_FWD) != 0) 1681 cert_ext_add("permit-port-forwarding", NULL, 0); 1682 if ((certflags_flags & CERTOPT_PTY) != 0) 1683 cert_ext_add("permit-pty", NULL, 0); 1684 if ((certflags_flags & CERTOPT_USER_RC) != 0) 1685 cert_ext_add("permit-user-rc", NULL, 0); 1686 if ((certflags_flags & CERTOPT_NO_REQUIRE_USER_PRESENCE) != 0) 1687 cert_ext_add("no-touch-required", NULL, 0); 1688 /* order lexically by key */ 1689 if (ncert_ext > 0) 1690 qsort(cert_ext, ncert_ext, sizeof(*cert_ext), cert_ext_cmp); 1691 } 1692 1693 static struct sshkey * 1694 load_pkcs11_key(char *path) 1695 { 1696 #ifdef ENABLE_PKCS11 1697 struct sshkey **keys = NULL, *public, *private = NULL; 1698 int r, i, nkeys; 1699 1700 if ((r = sshkey_load_public(path, &public, NULL)) != 0) 1701 fatal_r(r, "Couldn't load CA public key \"%s\"", path); 1702 1703 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, 1704 &keys, NULL); 1705 debug3_f("%d keys", nkeys); 1706 if (nkeys <= 0) 1707 fatal("cannot read public key from pkcs11"); 1708 for (i = 0; i < nkeys; i++) { 1709 if (sshkey_equal_public(public, keys[i])) { 1710 private = keys[i]; 1711 continue; 1712 } 1713 sshkey_free(keys[i]); 1714 } 1715 free(keys); 1716 sshkey_free(public); 1717 return private; 1718 #else 1719 fatal("no pkcs11 support"); 1720 #endif /* ENABLE_PKCS11 */ 1721 } 1722 1723 /* Signer for sshkey_certify_custom that uses the agent */ 1724 static int 1725 agent_signer(struct sshkey *key, u_char **sigp, size_t *lenp, 1726 const u_char *data, size_t datalen, 1727 const char *alg, const char *provider, const char *pin, 1728 u_int compat, void *ctx) 1729 { 1730 int *agent_fdp = (int *)ctx; 1731 1732 return ssh_agent_sign(*agent_fdp, key, sigp, lenp, 1733 data, datalen, alg, compat); 1734 } 1735 1736 static void 1737 do_ca_sign(struct passwd *pw, const char *ca_key_path, int prefer_agent, 1738 unsigned long long cert_serial, int cert_serial_autoinc, 1739 int argc, char **argv) 1740 { 1741 int r, i, found, agent_fd = -1; 1742 u_int n; 1743 struct sshkey *ca, *public; 1744 char valid[64], *otmp, *tmp, *cp, *out, *comment; 1745 char *ca_fp = NULL, **plist = NULL, *pin = NULL; 1746 struct ssh_identitylist *agent_ids; 1747 size_t j; 1748 struct notifier_ctx *notifier = NULL; 1749 1750 #ifdef ENABLE_PKCS11 1751 pkcs11_init(1); 1752 #endif 1753 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 1754 if (pkcs11provider != NULL) { 1755 /* If a PKCS#11 token was specified then try to use it */ 1756 if ((ca = load_pkcs11_key(tmp)) == NULL) 1757 fatal("No PKCS#11 key matching %s found", ca_key_path); 1758 } else if (prefer_agent) { 1759 /* 1760 * Agent signature requested. Try to use agent after making 1761 * sure the public key specified is actually present in the 1762 * agent. 1763 */ 1764 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 1765 fatal_r(r, "Cannot load CA public key %s", tmp); 1766 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 1767 fatal_r(r, "Cannot use public key for CA signature"); 1768 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0) 1769 fatal_r(r, "Retrieve agent key list"); 1770 found = 0; 1771 for (j = 0; j < agent_ids->nkeys; j++) { 1772 if (sshkey_equal(ca, agent_ids->keys[j])) { 1773 found = 1; 1774 break; 1775 } 1776 } 1777 if (!found) 1778 fatal("CA key %s not found in agent", tmp); 1779 ssh_free_identitylist(agent_ids); 1780 ca->flags |= SSHKEY_FLAG_EXT; 1781 } else { 1782 /* CA key is assumed to be a private key on the filesystem */ 1783 ca = load_identity(tmp, NULL); 1784 if (sshkey_is_sk(ca) && 1785 (ca->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) { 1786 if ((pin = read_passphrase("Enter PIN for CA key: ", 1787 RP_ALLOW_STDIN)) == NULL) 1788 fatal_f("couldn't read PIN"); 1789 } 1790 } 1791 free(tmp); 1792 1793 if (key_type_name != NULL) { 1794 if (sshkey_type_from_name(key_type_name) != ca->type) { 1795 fatal("CA key type %s doesn't match specified %s", 1796 sshkey_ssh_name(ca), key_type_name); 1797 } 1798 } else if (ca->type == KEY_RSA) { 1799 /* Default to a good signature algorithm */ 1800 key_type_name = "rsa-sha2-512"; 1801 } 1802 ca_fp = sshkey_fingerprint(ca, fingerprint_hash, SSH_FP_DEFAULT); 1803 1804 finalise_cert_exts(); 1805 for (i = 0; i < argc; i++) { 1806 /* Split list of principals */ 1807 n = 0; 1808 if (cert_principals != NULL) { 1809 otmp = tmp = xstrdup(cert_principals); 1810 plist = NULL; 1811 for (; (cp = strsep(&tmp, ",")) != NULL; n++) { 1812 plist = xreallocarray(plist, n + 1, sizeof(*plist)); 1813 if (*(plist[n] = xstrdup(cp)) == '\0') 1814 fatal("Empty principal name"); 1815 } 1816 free(otmp); 1817 } 1818 if (n > SSHKEY_CERT_MAX_PRINCIPALS) 1819 fatal("Too many certificate principals specified"); 1820 1821 tmp = tilde_expand_filename(argv[i], pw->pw_uid); 1822 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0) 1823 fatal_r(r, "load pubkey \"%s\"", tmp); 1824 if (sshkey_is_cert(public)) 1825 fatal_f("key \"%s\" type %s cannot be certified", 1826 tmp, sshkey_type(public)); 1827 1828 /* Prepare certificate to sign */ 1829 if ((r = sshkey_to_certified(public)) != 0) 1830 fatal_r(r, "Could not upgrade key %s to certificate", tmp); 1831 public->cert->type = cert_key_type; 1832 public->cert->serial = (u_int64_t)cert_serial; 1833 public->cert->key_id = xstrdup(cert_key_id); 1834 public->cert->nprincipals = n; 1835 public->cert->principals = plist; 1836 public->cert->valid_after = cert_valid_from; 1837 public->cert->valid_before = cert_valid_to; 1838 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL); 1839 prepare_options_buf(public->cert->extensions, 1840 OPTIONS_EXTENSIONS); 1841 if ((r = sshkey_from_private(ca, 1842 &public->cert->signature_key)) != 0) 1843 fatal_r(r, "sshkey_from_private (ca key)"); 1844 1845 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) { 1846 if ((r = sshkey_certify_custom(public, ca, 1847 key_type_name, sk_provider, NULL, agent_signer, 1848 &agent_fd)) != 0) 1849 fatal_r(r, "Couldn't certify %s via agent", tmp); 1850 } else { 1851 if (sshkey_is_sk(ca) && 1852 (ca->sk_flags & SSH_SK_USER_PRESENCE_REQD)) { 1853 notifier = notify_start(0, 1854 "Confirm user presence for key %s %s", 1855 sshkey_type(ca), ca_fp); 1856 } 1857 r = sshkey_certify(public, ca, key_type_name, 1858 sk_provider, pin); 1859 notify_complete(notifier, "User presence confirmed"); 1860 if (r != 0) 1861 fatal_r(r, "Couldn't certify key %s", tmp); 1862 } 1863 1864 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0) 1865 *cp = '\0'; 1866 xasprintf(&out, "%s-cert.pub", tmp); 1867 free(tmp); 1868 1869 if ((r = sshkey_save_public(public, out, comment)) != 0) { 1870 fatal_r(r, "Unable to save public key to %s", 1871 identity_file); 1872 } 1873 1874 if (!quiet) { 1875 sshkey_format_cert_validity(public->cert, 1876 valid, sizeof(valid)); 1877 logit("Signed %s key %s: id \"%s\" serial %llu%s%s " 1878 "valid %s", sshkey_cert_type(public), 1879 out, public->cert->key_id, 1880 (unsigned long long)public->cert->serial, 1881 cert_principals != NULL ? " for " : "", 1882 cert_principals != NULL ? cert_principals : "", 1883 valid); 1884 } 1885 1886 sshkey_free(public); 1887 free(out); 1888 if (cert_serial_autoinc) 1889 cert_serial++; 1890 } 1891 if (pin != NULL) 1892 freezero(pin, strlen(pin)); 1893 free(ca_fp); 1894 #ifdef ENABLE_PKCS11 1895 pkcs11_terminate(); 1896 #endif 1897 exit(0); 1898 } 1899 1900 static u_int64_t 1901 parse_relative_time(const char *s, time_t now) 1902 { 1903 int64_t mul, secs; 1904 1905 mul = *s == '-' ? -1 : 1; 1906 1907 if ((secs = convtime(s + 1)) == -1) 1908 fatal("Invalid relative certificate time %s", s); 1909 if (mul == -1 && secs > now) 1910 fatal("Certificate time %s cannot be represented", s); 1911 return now + (u_int64_t)(secs * mul); 1912 } 1913 1914 static void 1915 parse_cert_times(char *timespec) 1916 { 1917 char *from, *to; 1918 time_t now = time(NULL); 1919 int64_t secs; 1920 1921 /* +timespec relative to now */ 1922 if (*timespec == '+' && strchr(timespec, ':') == NULL) { 1923 if ((secs = convtime(timespec + 1)) == -1) 1924 fatal("Invalid relative certificate life %s", timespec); 1925 cert_valid_to = now + secs; 1926 /* 1927 * Backdate certificate one minute to avoid problems on hosts 1928 * with poorly-synchronised clocks. 1929 */ 1930 cert_valid_from = ((now - 59)/ 60) * 60; 1931 return; 1932 } 1933 1934 /* 1935 * from:to, where 1936 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "always" 1937 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "forever" 1938 */ 1939 from = xstrdup(timespec); 1940 to = strchr(from, ':'); 1941 if (to == NULL || from == to || *(to + 1) == '\0') 1942 fatal("Invalid certificate life specification %s", timespec); 1943 *to++ = '\0'; 1944 1945 if (*from == '-' || *from == '+') 1946 cert_valid_from = parse_relative_time(from, now); 1947 else if (strcmp(from, "always") == 0) 1948 cert_valid_from = 0; 1949 else if (parse_absolute_time(from, &cert_valid_from) != 0) 1950 fatal("Invalid from time \"%s\"", from); 1951 1952 if (*to == '-' || *to == '+') 1953 cert_valid_to = parse_relative_time(to, now); 1954 else if (strcmp(to, "forever") == 0) 1955 cert_valid_to = ~(u_int64_t)0; 1956 else if (parse_absolute_time(to, &cert_valid_to) != 0) 1957 fatal("Invalid to time \"%s\"", to); 1958 1959 if (cert_valid_to <= cert_valid_from) 1960 fatal("Empty certificate validity interval"); 1961 free(from); 1962 } 1963 1964 static void 1965 add_cert_option(char *opt) 1966 { 1967 char *val, *cp; 1968 int iscrit = 0; 1969 1970 if (strcasecmp(opt, "clear") == 0) 1971 certflags_flags = 0; 1972 else if (strcasecmp(opt, "no-x11-forwarding") == 0) 1973 certflags_flags &= ~CERTOPT_X_FWD; 1974 else if (strcasecmp(opt, "permit-x11-forwarding") == 0) 1975 certflags_flags |= CERTOPT_X_FWD; 1976 else if (strcasecmp(opt, "no-agent-forwarding") == 0) 1977 certflags_flags &= ~CERTOPT_AGENT_FWD; 1978 else if (strcasecmp(opt, "permit-agent-forwarding") == 0) 1979 certflags_flags |= CERTOPT_AGENT_FWD; 1980 else if (strcasecmp(opt, "no-port-forwarding") == 0) 1981 certflags_flags &= ~CERTOPT_PORT_FWD; 1982 else if (strcasecmp(opt, "permit-port-forwarding") == 0) 1983 certflags_flags |= CERTOPT_PORT_FWD; 1984 else if (strcasecmp(opt, "no-pty") == 0) 1985 certflags_flags &= ~CERTOPT_PTY; 1986 else if (strcasecmp(opt, "permit-pty") == 0) 1987 certflags_flags |= CERTOPT_PTY; 1988 else if (strcasecmp(opt, "no-user-rc") == 0) 1989 certflags_flags &= ~CERTOPT_USER_RC; 1990 else if (strcasecmp(opt, "permit-user-rc") == 0) 1991 certflags_flags |= CERTOPT_USER_RC; 1992 else if (strcasecmp(opt, "touch-required") == 0) 1993 certflags_flags &= ~CERTOPT_NO_REQUIRE_USER_PRESENCE; 1994 else if (strcasecmp(opt, "no-touch-required") == 0) 1995 certflags_flags |= CERTOPT_NO_REQUIRE_USER_PRESENCE; 1996 else if (strncasecmp(opt, "force-command=", 14) == 0) { 1997 val = opt + 14; 1998 if (*val == '\0') 1999 fatal("Empty force-command option"); 2000 if (certflags_command != NULL) 2001 fatal("force-command already specified"); 2002 certflags_command = xstrdup(val); 2003 } else if (strncasecmp(opt, "source-address=", 15) == 0) { 2004 val = opt + 15; 2005 if (*val == '\0') 2006 fatal("Empty source-address option"); 2007 if (certflags_src_addr != NULL) 2008 fatal("source-address already specified"); 2009 if (addr_match_cidr_list(NULL, val) != 0) 2010 fatal("Invalid source-address list"); 2011 certflags_src_addr = xstrdup(val); 2012 } else if (strncasecmp(opt, "extension:", 10) == 0 || 2013 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) { 2014 val = xstrdup(strchr(opt, ':') + 1); 2015 if ((cp = strchr(val, '=')) != NULL) 2016 *cp++ = '\0'; 2017 cert_ext_add(val, cp, iscrit); 2018 free(val); 2019 } else 2020 fatal("Unsupported certificate option \"%s\"", opt); 2021 } 2022 2023 static void 2024 show_options(struct sshbuf *optbuf, int in_critical) 2025 { 2026 char *name, *arg, *hex; 2027 struct sshbuf *options, *option = NULL; 2028 int r; 2029 2030 if ((options = sshbuf_fromb(optbuf)) == NULL) 2031 fatal_f("sshbuf_fromb failed"); 2032 while (sshbuf_len(options) != 0) { 2033 sshbuf_free(option); 2034 option = NULL; 2035 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 || 2036 (r = sshbuf_froms(options, &option)) != 0) 2037 fatal_fr(r, "parse option"); 2038 printf(" %s", name); 2039 if (!in_critical && 2040 (strcmp(name, "permit-X11-forwarding") == 0 || 2041 strcmp(name, "permit-agent-forwarding") == 0 || 2042 strcmp(name, "permit-port-forwarding") == 0 || 2043 strcmp(name, "permit-pty") == 0 || 2044 strcmp(name, "permit-user-rc") == 0 || 2045 strcmp(name, "no-touch-required") == 0)) { 2046 printf("\n"); 2047 } else if (in_critical && 2048 (strcmp(name, "force-command") == 0 || 2049 strcmp(name, "source-address") == 0)) { 2050 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0) 2051 fatal_fr(r, "parse critical"); 2052 printf(" %s\n", arg); 2053 free(arg); 2054 } else if (sshbuf_len(option) > 0) { 2055 hex = sshbuf_dtob16(option); 2056 printf(" UNKNOWN OPTION: %s (len %zu)\n", 2057 hex, sshbuf_len(option)); 2058 sshbuf_reset(option); 2059 free(hex); 2060 } else 2061 printf(" UNKNOWN FLAG OPTION\n"); 2062 free(name); 2063 if (sshbuf_len(option) != 0) 2064 fatal("Option corrupt: extra data at end"); 2065 } 2066 sshbuf_free(option); 2067 sshbuf_free(options); 2068 } 2069 2070 static void 2071 print_cert(struct sshkey *key) 2072 { 2073 char valid[64], *key_fp, *ca_fp; 2074 u_int i; 2075 2076 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT); 2077 ca_fp = sshkey_fingerprint(key->cert->signature_key, 2078 fingerprint_hash, SSH_FP_DEFAULT); 2079 if (key_fp == NULL || ca_fp == NULL) 2080 fatal_f("sshkey_fingerprint fail"); 2081 sshkey_format_cert_validity(key->cert, valid, sizeof(valid)); 2082 2083 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key), 2084 sshkey_cert_type(key)); 2085 printf(" Public key: %s %s\n", sshkey_type(key), key_fp); 2086 printf(" Signing CA: %s %s (using %s)\n", 2087 sshkey_type(key->cert->signature_key), ca_fp, 2088 key->cert->signature_type); 2089 printf(" Key ID: \"%s\"\n", key->cert->key_id); 2090 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial); 2091 printf(" Valid: %s\n", valid); 2092 printf(" Principals: "); 2093 if (key->cert->nprincipals == 0) 2094 printf("(none)\n"); 2095 else { 2096 for (i = 0; i < key->cert->nprincipals; i++) 2097 printf("\n %s", 2098 key->cert->principals[i]); 2099 printf("\n"); 2100 } 2101 printf(" Critical Options: "); 2102 if (sshbuf_len(key->cert->critical) == 0) 2103 printf("(none)\n"); 2104 else { 2105 printf("\n"); 2106 show_options(key->cert->critical, 1); 2107 } 2108 printf(" Extensions: "); 2109 if (sshbuf_len(key->cert->extensions) == 0) 2110 printf("(none)\n"); 2111 else { 2112 printf("\n"); 2113 show_options(key->cert->extensions, 0); 2114 } 2115 } 2116 2117 static void 2118 do_show_cert(struct passwd *pw) 2119 { 2120 struct sshkey *key = NULL; 2121 struct stat st; 2122 int r, is_stdin = 0, ok = 0; 2123 FILE *f; 2124 char *cp, *line = NULL; 2125 const char *path; 2126 size_t linesize = 0; 2127 u_long lnum = 0; 2128 2129 if (!have_identity) 2130 ask_filename(pw, "Enter file in which the key is"); 2131 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) == -1) 2132 fatal("%s: %s: %s", __progname, identity_file, strerror(errno)); 2133 2134 path = identity_file; 2135 if (strcmp(path, "-") == 0) { 2136 f = stdin; 2137 path = "(stdin)"; 2138 is_stdin = 1; 2139 } else if ((f = fopen(identity_file, "r")) == NULL) 2140 fatal("fopen %s: %s", identity_file, strerror(errno)); 2141 2142 while (getline(&line, &linesize, f) != -1) { 2143 lnum++; 2144 sshkey_free(key); 2145 key = NULL; 2146 /* Trim leading space and comments */ 2147 cp = line + strspn(line, " \t"); 2148 if (*cp == '#' || *cp == '\0') 2149 continue; 2150 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2151 fatal("sshkey_new"); 2152 if ((r = sshkey_read(key, &cp)) != 0) { 2153 error_r(r, "%s:%lu: invalid key", path, lnum); 2154 continue; 2155 } 2156 if (!sshkey_is_cert(key)) { 2157 error("%s:%lu is not a certificate", path, lnum); 2158 continue; 2159 } 2160 ok = 1; 2161 if (!is_stdin && lnum == 1) 2162 printf("%s:\n", path); 2163 else 2164 printf("%s:%lu:\n", path, lnum); 2165 print_cert(key); 2166 } 2167 free(line); 2168 sshkey_free(key); 2169 fclose(f); 2170 exit(ok ? 0 : 1); 2171 } 2172 2173 static void 2174 load_krl(const char *path, struct ssh_krl **krlp) 2175 { 2176 struct sshbuf *krlbuf; 2177 int r; 2178 2179 if ((r = sshbuf_load_file(path, &krlbuf)) != 0) 2180 fatal_r(r, "Unable to load KRL %s", path); 2181 /* XXX check sigs */ 2182 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 || 2183 *krlp == NULL) 2184 fatal_r(r, "Invalid KRL file %s", path); 2185 sshbuf_free(krlbuf); 2186 } 2187 2188 static void 2189 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp, 2190 const char *file, u_long lnum) 2191 { 2192 char *tmp; 2193 size_t tlen; 2194 struct sshbuf *b; 2195 int r; 2196 2197 if (strncmp(cp, "SHA256:", 7) != 0) 2198 fatal("%s:%lu: unsupported hash algorithm", file, lnum); 2199 cp += 7; 2200 2201 /* 2202 * OpenSSH base64 hashes omit trailing '=' 2203 * characters; put them back for decode. 2204 */ 2205 tlen = strlen(cp); 2206 tmp = xmalloc(tlen + 4 + 1); 2207 strlcpy(tmp, cp, tlen + 1); 2208 while ((tlen % 4) != 0) { 2209 tmp[tlen++] = '='; 2210 tmp[tlen] = '\0'; 2211 } 2212 if ((b = sshbuf_new()) == NULL) 2213 fatal_f("sshbuf_new failed"); 2214 if ((r = sshbuf_b64tod(b, tmp)) != 0) 2215 fatal_r(r, "%s:%lu: decode hash failed", file, lnum); 2216 free(tmp); 2217 *lenp = sshbuf_len(b); 2218 *blobp = xmalloc(*lenp); 2219 memcpy(*blobp, sshbuf_ptr(b), *lenp); 2220 sshbuf_free(b); 2221 } 2222 2223 static void 2224 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca, 2225 const struct sshkey *ca, struct ssh_krl *krl) 2226 { 2227 struct sshkey *key = NULL; 2228 u_long lnum = 0; 2229 char *path, *cp, *ep, *line = NULL; 2230 u_char *blob = NULL; 2231 size_t blen = 0, linesize = 0; 2232 unsigned long long serial, serial2; 2233 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r; 2234 FILE *krl_spec; 2235 2236 path = tilde_expand_filename(file, pw->pw_uid); 2237 if (strcmp(path, "-") == 0) { 2238 krl_spec = stdin; 2239 free(path); 2240 path = xstrdup("(standard input)"); 2241 } else if ((krl_spec = fopen(path, "r")) == NULL) 2242 fatal("fopen %s: %s", path, strerror(errno)); 2243 2244 if (!quiet) 2245 printf("Revoking from %s\n", path); 2246 while (getline(&line, &linesize, krl_spec) != -1) { 2247 lnum++; 2248 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0; 2249 cp = line + strspn(line, " \t"); 2250 /* Trim trailing space, comments and strip \n */ 2251 for (i = 0, r = -1; cp[i] != '\0'; i++) { 2252 if (cp[i] == '#' || cp[i] == '\n') { 2253 cp[i] = '\0'; 2254 break; 2255 } 2256 if (cp[i] == ' ' || cp[i] == '\t') { 2257 /* Remember the start of a span of whitespace */ 2258 if (r == -1) 2259 r = i; 2260 } else 2261 r = -1; 2262 } 2263 if (r != -1) 2264 cp[r] = '\0'; 2265 if (*cp == '\0') 2266 continue; 2267 if (strncasecmp(cp, "serial:", 7) == 0) { 2268 if (ca == NULL && !wild_ca) { 2269 fatal("revoking certificates by serial number " 2270 "requires specification of a CA key"); 2271 } 2272 cp += 7; 2273 cp = cp + strspn(cp, " \t"); 2274 errno = 0; 2275 serial = strtoull(cp, &ep, 0); 2276 if (*cp == '\0' || (*ep != '\0' && *ep != '-')) 2277 fatal("%s:%lu: invalid serial \"%s\"", 2278 path, lnum, cp); 2279 if (errno == ERANGE && serial == ULLONG_MAX) 2280 fatal("%s:%lu: serial out of range", 2281 path, lnum); 2282 serial2 = serial; 2283 if (*ep == '-') { 2284 cp = ep + 1; 2285 errno = 0; 2286 serial2 = strtoull(cp, &ep, 0); 2287 if (*cp == '\0' || *ep != '\0') 2288 fatal("%s:%lu: invalid serial \"%s\"", 2289 path, lnum, cp); 2290 if (errno == ERANGE && serial2 == ULLONG_MAX) 2291 fatal("%s:%lu: serial out of range", 2292 path, lnum); 2293 if (serial2 <= serial) 2294 fatal("%s:%lu: invalid serial range " 2295 "%llu:%llu", path, lnum, 2296 (unsigned long long)serial, 2297 (unsigned long long)serial2); 2298 } 2299 if (ssh_krl_revoke_cert_by_serial_range(krl, 2300 ca, serial, serial2) != 0) { 2301 fatal_f("revoke serial failed"); 2302 } 2303 } else if (strncasecmp(cp, "id:", 3) == 0) { 2304 if (ca == NULL && !wild_ca) { 2305 fatal("revoking certificates by key ID " 2306 "requires specification of a CA key"); 2307 } 2308 cp += 3; 2309 cp = cp + strspn(cp, " \t"); 2310 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0) 2311 fatal_f("revoke key ID failed"); 2312 } else if (strncasecmp(cp, "hash:", 5) == 0) { 2313 cp += 5; 2314 cp = cp + strspn(cp, " \t"); 2315 hash_to_blob(cp, &blob, &blen, file, lnum); 2316 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2317 if (r != 0) 2318 fatal_fr(r, "revoke key failed"); 2319 } else { 2320 if (strncasecmp(cp, "key:", 4) == 0) { 2321 cp += 4; 2322 cp = cp + strspn(cp, " \t"); 2323 was_explicit_key = 1; 2324 } else if (strncasecmp(cp, "sha1:", 5) == 0) { 2325 cp += 5; 2326 cp = cp + strspn(cp, " \t"); 2327 was_sha1 = 1; 2328 } else if (strncasecmp(cp, "sha256:", 7) == 0) { 2329 cp += 7; 2330 cp = cp + strspn(cp, " \t"); 2331 was_sha256 = 1; 2332 /* 2333 * Just try to process the line as a key. 2334 * Parsing will fail if it isn't. 2335 */ 2336 } 2337 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) 2338 fatal("sshkey_new"); 2339 if ((r = sshkey_read(key, &cp)) != 0) 2340 fatal_r(r, "%s:%lu: invalid key", path, lnum); 2341 if (was_explicit_key) 2342 r = ssh_krl_revoke_key_explicit(krl, key); 2343 else if (was_sha1) { 2344 if (sshkey_fingerprint_raw(key, 2345 SSH_DIGEST_SHA1, &blob, &blen) != 0) { 2346 fatal("%s:%lu: fingerprint failed", 2347 file, lnum); 2348 } 2349 r = ssh_krl_revoke_key_sha1(krl, blob, blen); 2350 } else if (was_sha256) { 2351 if (sshkey_fingerprint_raw(key, 2352 SSH_DIGEST_SHA256, &blob, &blen) != 0) { 2353 fatal("%s:%lu: fingerprint failed", 2354 file, lnum); 2355 } 2356 r = ssh_krl_revoke_key_sha256(krl, blob, blen); 2357 } else 2358 r = ssh_krl_revoke_key(krl, key); 2359 if (r != 0) 2360 fatal_fr(r, "revoke key failed"); 2361 freezero(blob, blen); 2362 blob = NULL; 2363 blen = 0; 2364 sshkey_free(key); 2365 } 2366 } 2367 if (strcmp(path, "-") != 0) 2368 fclose(krl_spec); 2369 free(line); 2370 free(path); 2371 } 2372 2373 static void 2374 do_gen_krl(struct passwd *pw, int updating, const char *ca_key_path, 2375 unsigned long long krl_version, const char *krl_comment, 2376 int argc, char **argv) 2377 { 2378 struct ssh_krl *krl; 2379 struct stat sb; 2380 struct sshkey *ca = NULL; 2381 int i, r, wild_ca = 0; 2382 char *tmp; 2383 struct sshbuf *kbuf; 2384 2385 if (*identity_file == '\0') 2386 fatal("KRL generation requires an output file"); 2387 if (stat(identity_file, &sb) == -1) { 2388 if (errno != ENOENT) 2389 fatal("Cannot access KRL \"%s\": %s", 2390 identity_file, strerror(errno)); 2391 if (updating) 2392 fatal("KRL \"%s\" does not exist", identity_file); 2393 } 2394 if (ca_key_path != NULL) { 2395 if (strcasecmp(ca_key_path, "none") == 0) 2396 wild_ca = 1; 2397 else { 2398 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid); 2399 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0) 2400 fatal_r(r, "Cannot load CA public key %s", tmp); 2401 free(tmp); 2402 } 2403 } 2404 2405 if (updating) 2406 load_krl(identity_file, &krl); 2407 else if ((krl = ssh_krl_init()) == NULL) 2408 fatal("couldn't create KRL"); 2409 2410 if (krl_version != 0) 2411 ssh_krl_set_version(krl, krl_version); 2412 if (krl_comment != NULL) 2413 ssh_krl_set_comment(krl, krl_comment); 2414 2415 for (i = 0; i < argc; i++) 2416 update_krl_from_file(pw, argv[i], wild_ca, ca, krl); 2417 2418 if ((kbuf = sshbuf_new()) == NULL) 2419 fatal("sshbuf_new failed"); 2420 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0) 2421 fatal("Couldn't generate KRL"); 2422 if ((r = sshbuf_write_file(identity_file, kbuf)) != 0) 2423 fatal("write %s: %s", identity_file, strerror(errno)); 2424 sshbuf_free(kbuf); 2425 ssh_krl_free(krl); 2426 sshkey_free(ca); 2427 } 2428 2429 static void 2430 do_check_krl(struct passwd *pw, int print_krl, int argc, char **argv) 2431 { 2432 int i, r, ret = 0; 2433 char *comment; 2434 struct ssh_krl *krl; 2435 struct sshkey *k; 2436 2437 if (*identity_file == '\0') 2438 fatal("KRL checking requires an input file"); 2439 load_krl(identity_file, &krl); 2440 if (print_krl) 2441 krl_dump(krl, stdout); 2442 for (i = 0; i < argc; i++) { 2443 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0) 2444 fatal_r(r, "Cannot load public key %s", argv[i]); 2445 r = ssh_krl_check_key(krl, k); 2446 printf("%s%s%s%s: %s\n", argv[i], 2447 *comment ? " (" : "", comment, *comment ? ")" : "", 2448 r == 0 ? "ok" : "REVOKED"); 2449 if (r != 0) 2450 ret = 1; 2451 sshkey_free(k); 2452 free(comment); 2453 } 2454 ssh_krl_free(krl); 2455 exit(ret); 2456 } 2457 2458 static struct sshkey * 2459 load_sign_key(const char *keypath, const struct sshkey *pubkey) 2460 { 2461 size_t i, slen, plen = strlen(keypath); 2462 char *privpath = xstrdup(keypath); 2463 static const char * const suffixes[] = { "-cert.pub", ".pub", NULL }; 2464 struct sshkey *ret = NULL, *privkey = NULL; 2465 int r; 2466 2467 /* 2468 * If passed a public key filename, then try to locate the corresponding 2469 * private key. This lets us specify certificates on the command-line 2470 * and have ssh-keygen find the appropriate private key. 2471 */ 2472 for (i = 0; suffixes[i]; i++) { 2473 slen = strlen(suffixes[i]); 2474 if (plen <= slen || 2475 strcmp(privpath + plen - slen, suffixes[i]) != 0) 2476 continue; 2477 privpath[plen - slen] = '\0'; 2478 debug_f("%s looks like a public key, using private key " 2479 "path %s instead", keypath, privpath); 2480 } 2481 if ((privkey = load_identity(privpath, NULL)) == NULL) { 2482 error("Couldn't load identity %s", keypath); 2483 goto done; 2484 } 2485 if (!sshkey_equal_public(pubkey, privkey)) { 2486 error("Public key %s doesn't match private %s", 2487 keypath, privpath); 2488 goto done; 2489 } 2490 if (sshkey_is_cert(pubkey) && !sshkey_is_cert(privkey)) { 2491 /* 2492 * Graft the certificate onto the private key to make 2493 * it capable of signing. 2494 */ 2495 if ((r = sshkey_to_certified(privkey)) != 0) { 2496 error_fr(r, "sshkey_to_certified"); 2497 goto done; 2498 } 2499 if ((r = sshkey_cert_copy(pubkey, privkey)) != 0) { 2500 error_fr(r, "sshkey_cert_copy"); 2501 goto done; 2502 } 2503 } 2504 /* success */ 2505 ret = privkey; 2506 privkey = NULL; 2507 done: 2508 sshkey_free(privkey); 2509 free(privpath); 2510 return ret; 2511 } 2512 2513 static int 2514 sign_one(struct sshkey *signkey, const char *filename, int fd, 2515 const char *sig_namespace, const char *hashalg, sshsig_signer *signer, 2516 void *signer_ctx) 2517 { 2518 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2519 int r = SSH_ERR_INTERNAL_ERROR, wfd = -1, oerrno; 2520 char *wfile = NULL, *asig = NULL, *fp = NULL; 2521 char *pin = NULL, *prompt = NULL; 2522 2523 if (!quiet) { 2524 if (fd == STDIN_FILENO) 2525 fprintf(stderr, "Signing data on standard input\n"); 2526 else 2527 fprintf(stderr, "Signing file %s\n", filename); 2528 } 2529 if (signer == NULL && sshkey_is_sk(signkey)) { 2530 if ((signkey->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) { 2531 xasprintf(&prompt, "Enter PIN for %s key: ", 2532 sshkey_type(signkey)); 2533 if ((pin = read_passphrase(prompt, 2534 RP_ALLOW_STDIN)) == NULL) 2535 fatal_f("couldn't read PIN"); 2536 } 2537 if ((signkey->sk_flags & SSH_SK_USER_PRESENCE_REQD)) { 2538 if ((fp = sshkey_fingerprint(signkey, fingerprint_hash, 2539 SSH_FP_DEFAULT)) == NULL) 2540 fatal_f("fingerprint failed"); 2541 fprintf(stderr, "Confirm user presence for key %s %s\n", 2542 sshkey_type(signkey), fp); 2543 free(fp); 2544 } 2545 } 2546 if ((r = sshsig_sign_fd(signkey, hashalg, sk_provider, pin, 2547 fd, sig_namespace, &sigbuf, signer, signer_ctx)) != 0) { 2548 error_r(r, "Signing %s failed", filename); 2549 goto out; 2550 } 2551 if ((r = sshsig_armor(sigbuf, &abuf)) != 0) { 2552 error_fr(r, "sshsig_armor"); 2553 goto out; 2554 } 2555 if ((asig = sshbuf_dup_string(abuf)) == NULL) { 2556 error_f("buffer error"); 2557 r = SSH_ERR_ALLOC_FAIL; 2558 goto out; 2559 } 2560 2561 if (fd == STDIN_FILENO) { 2562 fputs(asig, stdout); 2563 fflush(stdout); 2564 } else { 2565 xasprintf(&wfile, "%s.sig", filename); 2566 if (confirm_overwrite(wfile)) { 2567 if ((wfd = open(wfile, O_WRONLY|O_CREAT|O_TRUNC, 2568 0666)) == -1) { 2569 oerrno = errno; 2570 error("Cannot open %s: %s", 2571 wfile, strerror(errno)); 2572 errno = oerrno; 2573 r = SSH_ERR_SYSTEM_ERROR; 2574 goto out; 2575 } 2576 if (atomicio(vwrite, wfd, asig, 2577 strlen(asig)) != strlen(asig)) { 2578 oerrno = errno; 2579 error("Cannot write to %s: %s", 2580 wfile, strerror(errno)); 2581 errno = oerrno; 2582 r = SSH_ERR_SYSTEM_ERROR; 2583 goto out; 2584 } 2585 if (!quiet) { 2586 fprintf(stderr, "Write signature to %s\n", 2587 wfile); 2588 } 2589 } 2590 } 2591 /* success */ 2592 r = 0; 2593 out: 2594 free(wfile); 2595 free(prompt); 2596 free(asig); 2597 if (pin != NULL) 2598 freezero(pin, strlen(pin)); 2599 sshbuf_free(abuf); 2600 sshbuf_free(sigbuf); 2601 if (wfd != -1) 2602 close(wfd); 2603 return r; 2604 } 2605 2606 static int 2607 sig_process_opts(char * const *opts, size_t nopts, char **hashalgp, 2608 uint64_t *verify_timep, int *print_pubkey) 2609 { 2610 size_t i; 2611 time_t now; 2612 2613 if (verify_timep != NULL) 2614 *verify_timep = 0; 2615 if (print_pubkey != NULL) 2616 *print_pubkey = 0; 2617 if (hashalgp != NULL) 2618 *hashalgp = NULL; 2619 for (i = 0; i < nopts; i++) { 2620 if (hashalgp != NULL && 2621 strncasecmp(opts[i], "hashalg=", 8) == 0) { 2622 *hashalgp = xstrdup(opts[i] + 8); 2623 } else if (verify_timep && 2624 strncasecmp(opts[i], "verify-time=", 12) == 0) { 2625 if (parse_absolute_time(opts[i] + 12, 2626 verify_timep) != 0 || *verify_timep == 0) { 2627 error("Invalid \"verify-time\" option"); 2628 return SSH_ERR_INVALID_ARGUMENT; 2629 } 2630 } else if (print_pubkey && 2631 strcasecmp(opts[i], "print-pubkey") == 0) { 2632 *print_pubkey = 1; 2633 } else { 2634 error("Invalid option \"%s\"", opts[i]); 2635 return SSH_ERR_INVALID_ARGUMENT; 2636 } 2637 } 2638 if (verify_timep && *verify_timep == 0) { 2639 if ((now = time(NULL)) < 0) { 2640 error("Time is before epoch"); 2641 return SSH_ERR_INVALID_ARGUMENT; 2642 } 2643 *verify_timep = (uint64_t)now; 2644 } 2645 return 0; 2646 } 2647 2648 2649 static int 2650 sig_sign(const char *keypath, const char *sig_namespace, int argc, char **argv, 2651 char * const *opts, size_t nopts) 2652 { 2653 int i, fd = -1, r, ret = -1; 2654 int agent_fd = -1; 2655 struct sshkey *pubkey = NULL, *privkey = NULL, *signkey = NULL; 2656 sshsig_signer *signer = NULL; 2657 char *hashalg = NULL; 2658 2659 /* Check file arguments. */ 2660 for (i = 0; i < argc; i++) { 2661 if (strcmp(argv[i], "-") != 0) 2662 continue; 2663 if (i > 0 || argc > 1) 2664 fatal("Cannot sign mix of paths and standard input"); 2665 } 2666 2667 if (sig_process_opts(opts, nopts, &hashalg, NULL, NULL) != 0) 2668 goto done; /* error already logged */ 2669 2670 if ((r = sshkey_load_public(keypath, &pubkey, NULL)) != 0) { 2671 error_r(r, "Couldn't load public key %s", keypath); 2672 goto done; 2673 } 2674 2675 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) 2676 debug_r(r, "Couldn't get agent socket"); 2677 else { 2678 if ((r = ssh_agent_has_key(agent_fd, pubkey)) == 0) 2679 signer = agent_signer; 2680 else 2681 debug_r(r, "Couldn't find key in agent"); 2682 } 2683 2684 if (signer == NULL) { 2685 /* Not using agent - try to load private key */ 2686 if ((privkey = load_sign_key(keypath, pubkey)) == NULL) 2687 goto done; 2688 signkey = privkey; 2689 } else { 2690 /* Will use key in agent */ 2691 signkey = pubkey; 2692 } 2693 2694 if (argc == 0) { 2695 if ((r = sign_one(signkey, "(stdin)", STDIN_FILENO, 2696 sig_namespace, hashalg, signer, &agent_fd)) != 0) 2697 goto done; 2698 } else { 2699 for (i = 0; i < argc; i++) { 2700 if (strcmp(argv[i], "-") == 0) 2701 fd = STDIN_FILENO; 2702 else if ((fd = open(argv[i], O_RDONLY)) == -1) { 2703 error("Cannot open %s for signing: %s", 2704 argv[i], strerror(errno)); 2705 goto done; 2706 } 2707 if ((r = sign_one(signkey, argv[i], fd, sig_namespace, 2708 hashalg, signer, &agent_fd)) != 0) 2709 goto done; 2710 if (fd != STDIN_FILENO) 2711 close(fd); 2712 fd = -1; 2713 } 2714 } 2715 2716 ret = 0; 2717 done: 2718 if (fd != -1 && fd != STDIN_FILENO) 2719 close(fd); 2720 sshkey_free(pubkey); 2721 sshkey_free(privkey); 2722 free(hashalg); 2723 return ret; 2724 } 2725 2726 static int 2727 sig_verify(const char *signature, const char *sig_namespace, 2728 const char *principal, const char *allowed_keys, const char *revoked_keys, 2729 char * const *opts, size_t nopts) 2730 { 2731 int r, ret = -1; 2732 int print_pubkey = 0; 2733 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2734 struct sshkey *sign_key = NULL; 2735 char *fp = NULL; 2736 struct sshkey_sig_details *sig_details = NULL; 2737 uint64_t verify_time = 0; 2738 2739 if (sig_process_opts(opts, nopts, NULL, &verify_time, 2740 &print_pubkey) != 0) 2741 goto done; /* error already logged */ 2742 2743 memset(&sig_details, 0, sizeof(sig_details)); 2744 if ((r = sshbuf_load_file(signature, &abuf)) != 0) { 2745 error_r(r, "Couldn't read signature file"); 2746 goto done; 2747 } 2748 2749 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) { 2750 error_fr(r, "sshsig_armor"); 2751 goto done; 2752 } 2753 if ((r = sshsig_verify_fd(sigbuf, STDIN_FILENO, sig_namespace, 2754 &sign_key, &sig_details)) != 0) 2755 goto done; /* sshsig_verify() prints error */ 2756 2757 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash, 2758 SSH_FP_DEFAULT)) == NULL) 2759 fatal_f("sshkey_fingerprint failed"); 2760 debug("Valid (unverified) signature from key %s", fp); 2761 if (sig_details != NULL) { 2762 debug2_f("signature details: counter = %u, flags = 0x%02x", 2763 sig_details->sk_counter, sig_details->sk_flags); 2764 } 2765 free(fp); 2766 fp = NULL; 2767 2768 if (revoked_keys != NULL) { 2769 if ((r = sshkey_check_revoked(sign_key, revoked_keys)) != 0) { 2770 debug3_fr(r, "sshkey_check_revoked"); 2771 goto done; 2772 } 2773 } 2774 2775 if (allowed_keys != NULL && (r = sshsig_check_allowed_keys(allowed_keys, 2776 sign_key, principal, sig_namespace, verify_time)) != 0) { 2777 debug3_fr(r, "sshsig_check_allowed_keys"); 2778 goto done; 2779 } 2780 /* success */ 2781 ret = 0; 2782 done: 2783 if (!quiet) { 2784 if (ret == 0) { 2785 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash, 2786 SSH_FP_DEFAULT)) == NULL) 2787 fatal_f("sshkey_fingerprint failed"); 2788 if (principal == NULL) { 2789 printf("Good \"%s\" signature with %s key %s\n", 2790 sig_namespace, sshkey_type(sign_key), fp); 2791 2792 } else { 2793 printf("Good \"%s\" signature for %s with %s key %s\n", 2794 sig_namespace, principal, 2795 sshkey_type(sign_key), fp); 2796 } 2797 } else { 2798 printf("Could not verify signature.\n"); 2799 } 2800 } 2801 /* Print the signature key if requested */ 2802 if (ret == 0 && print_pubkey && sign_key != NULL) { 2803 if ((r = sshkey_write(sign_key, stdout)) == 0) 2804 fputc('\n', stdout); 2805 else { 2806 error_r(r, "Could not print public key.\n"); 2807 ret = -1; 2808 } 2809 } 2810 sshbuf_free(sigbuf); 2811 sshbuf_free(abuf); 2812 sshkey_free(sign_key); 2813 sshkey_sig_details_free(sig_details); 2814 free(fp); 2815 return ret; 2816 } 2817 2818 static int 2819 sig_find_principals(const char *signature, const char *allowed_keys, 2820 char * const *opts, size_t nopts) 2821 { 2822 int r, ret = -1; 2823 struct sshbuf *sigbuf = NULL, *abuf = NULL; 2824 struct sshkey *sign_key = NULL; 2825 char *principals = NULL, *cp, *tmp; 2826 uint64_t verify_time = 0; 2827 2828 if (sig_process_opts(opts, nopts, NULL, &verify_time, NULL) != 0) 2829 goto done; /* error already logged */ 2830 2831 if ((r = sshbuf_load_file(signature, &abuf)) != 0) { 2832 error_r(r, "Couldn't read signature file"); 2833 goto done; 2834 } 2835 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) { 2836 error_fr(r, "sshsig_armor"); 2837 goto done; 2838 } 2839 if ((r = sshsig_get_pubkey(sigbuf, &sign_key)) != 0) { 2840 error_fr(r, "sshsig_get_pubkey"); 2841 goto done; 2842 } 2843 if ((r = sshsig_find_principals(allowed_keys, sign_key, 2844 verify_time, &principals)) != 0) { 2845 if (r != SSH_ERR_KEY_NOT_FOUND) 2846 error_fr(r, "sshsig_find_principal"); 2847 goto done; 2848 } 2849 ret = 0; 2850 done: 2851 if (ret == 0 ) { 2852 /* Emit matching principals one per line */ 2853 tmp = principals; 2854 while ((cp = strsep(&tmp, ",")) != NULL && *cp != '\0') 2855 puts(cp); 2856 } else { 2857 fprintf(stderr, "No principal matched.\n"); 2858 } 2859 sshbuf_free(sigbuf); 2860 sshbuf_free(abuf); 2861 sshkey_free(sign_key); 2862 free(principals); 2863 return ret; 2864 } 2865 2866 static int 2867 sig_match_principals(const char *allowed_keys, char *principal, 2868 char * const *opts, size_t nopts) 2869 { 2870 int r; 2871 char **principals = NULL; 2872 size_t i, nprincipals = 0; 2873 2874 if ((r = sig_process_opts(opts, nopts, NULL, NULL, NULL)) != 0) 2875 return r; /* error already logged */ 2876 2877 if ((r = sshsig_match_principals(allowed_keys, principal, 2878 &principals, &nprincipals)) != 0) { 2879 debug_f("match: %s", ssh_err(r)); 2880 fprintf(stderr, "No principal matched.\n"); 2881 return r; 2882 } 2883 for (i = 0; i < nprincipals; i++) { 2884 printf("%s\n", principals[i]); 2885 free(principals[i]); 2886 } 2887 free(principals); 2888 2889 return 0; 2890 } 2891 2892 static void 2893 do_moduli_gen(const char *out_file, char **opts, size_t nopts) 2894 { 2895 #ifdef WITH_OPENSSL 2896 /* Moduli generation/screening */ 2897 u_int32_t memory = 0; 2898 BIGNUM *start = NULL; 2899 int moduli_bits = 0; 2900 FILE *out; 2901 size_t i; 2902 const char *errstr; 2903 2904 /* Parse options */ 2905 for (i = 0; i < nopts; i++) { 2906 if (strncmp(opts[i], "memory=", 7) == 0) { 2907 memory = (u_int32_t)strtonum(opts[i]+7, 1, 2908 UINT_MAX, &errstr); 2909 if (errstr) { 2910 fatal("Memory limit is %s: %s", 2911 errstr, opts[i]+7); 2912 } 2913 } else if (strncmp(opts[i], "start=", 6) == 0) { 2914 /* XXX - also compare length against bits */ 2915 if (BN_hex2bn(&start, opts[i]+6) == 0) 2916 fatal("Invalid start point."); 2917 } else if (strncmp(opts[i], "bits=", 5) == 0) { 2918 moduli_bits = (int)strtonum(opts[i]+5, 1, 2919 INT_MAX, &errstr); 2920 if (errstr) { 2921 fatal("Invalid number: %s (%s)", 2922 opts[i]+12, errstr); 2923 } 2924 } else { 2925 fatal("Option \"%s\" is unsupported for moduli " 2926 "generation", opts[i]); 2927 } 2928 } 2929 2930 if ((out = fopen(out_file, "w")) == NULL) { 2931 fatal("Couldn't open modulus candidate file \"%s\": %s", 2932 out_file, strerror(errno)); 2933 } 2934 setvbuf(out, NULL, _IOLBF, 0); 2935 2936 if (moduli_bits == 0) 2937 moduli_bits = DEFAULT_BITS; 2938 if (gen_candidates(out, memory, moduli_bits, start) != 0) 2939 fatal("modulus candidate generation failed"); 2940 #else /* WITH_OPENSSL */ 2941 fatal("Moduli generation is not supported"); 2942 #endif /* WITH_OPENSSL */ 2943 } 2944 2945 static void 2946 do_moduli_screen(const char *out_file, char **opts, size_t nopts) 2947 { 2948 #ifdef WITH_OPENSSL 2949 /* Moduli generation/screening */ 2950 char *checkpoint = NULL; 2951 u_int32_t generator_wanted = 0; 2952 unsigned long start_lineno = 0, lines_to_process = 0; 2953 int prime_tests = 0; 2954 FILE *out, *in = stdin; 2955 size_t i; 2956 const char *errstr; 2957 2958 /* Parse options */ 2959 for (i = 0; i < nopts; i++) { 2960 if (strncmp(opts[i], "lines=", 6) == 0) { 2961 lines_to_process = strtoul(opts[i]+6, NULL, 10); 2962 } else if (strncmp(opts[i], "start-line=", 11) == 0) { 2963 start_lineno = strtoul(opts[i]+11, NULL, 10); 2964 } else if (strncmp(opts[i], "checkpoint=", 11) == 0) { 2965 checkpoint = xstrdup(opts[i]+11); 2966 } else if (strncmp(opts[i], "generator=", 10) == 0) { 2967 generator_wanted = (u_int32_t)strtonum( 2968 opts[i]+10, 1, UINT_MAX, &errstr); 2969 if (errstr != NULL) { 2970 fatal("Generator invalid: %s (%s)", 2971 opts[i]+10, errstr); 2972 } 2973 } else if (strncmp(opts[i], "prime-tests=", 12) == 0) { 2974 prime_tests = (int)strtonum(opts[i]+12, 1, 2975 INT_MAX, &errstr); 2976 if (errstr) { 2977 fatal("Invalid number: %s (%s)", 2978 opts[i]+12, errstr); 2979 } 2980 } else { 2981 fatal("Option \"%s\" is unsupported for moduli " 2982 "screening", opts[i]); 2983 } 2984 } 2985 2986 if (have_identity && strcmp(identity_file, "-") != 0) { 2987 if ((in = fopen(identity_file, "r")) == NULL) { 2988 fatal("Couldn't open modulus candidate " 2989 "file \"%s\": %s", identity_file, 2990 strerror(errno)); 2991 } 2992 } 2993 2994 if ((out = fopen(out_file, "a")) == NULL) { 2995 fatal("Couldn't open moduli file \"%s\": %s", 2996 out_file, strerror(errno)); 2997 } 2998 setvbuf(out, NULL, _IOLBF, 0); 2999 if (prime_test(in, out, prime_tests == 0 ? 100 : prime_tests, 3000 generator_wanted, checkpoint, 3001 start_lineno, lines_to_process) != 0) 3002 fatal("modulus screening failed"); 3003 #else /* WITH_OPENSSL */ 3004 fatal("Moduli screening is not supported"); 3005 #endif /* WITH_OPENSSL */ 3006 } 3007 3008 static char * 3009 private_key_passphrase(void) 3010 { 3011 char *passphrase1, *passphrase2; 3012 3013 /* Ask for a passphrase (twice). */ 3014 if (identity_passphrase) 3015 passphrase1 = xstrdup(identity_passphrase); 3016 else if (identity_new_passphrase) 3017 passphrase1 = xstrdup(identity_new_passphrase); 3018 else { 3019 passphrase_again: 3020 passphrase1 = 3021 read_passphrase("Enter passphrase (empty for no " 3022 "passphrase): ", RP_ALLOW_STDIN); 3023 passphrase2 = read_passphrase("Enter same passphrase again: ", 3024 RP_ALLOW_STDIN); 3025 if (strcmp(passphrase1, passphrase2) != 0) { 3026 /* 3027 * The passphrases do not match. Clear them and 3028 * retry. 3029 */ 3030 freezero(passphrase1, strlen(passphrase1)); 3031 freezero(passphrase2, strlen(passphrase2)); 3032 printf("Passphrases do not match. Try again.\n"); 3033 goto passphrase_again; 3034 } 3035 /* Clear the other copy of the passphrase. */ 3036 freezero(passphrase2, strlen(passphrase2)); 3037 } 3038 return passphrase1; 3039 } 3040 3041 static char * 3042 sk_suffix(const char *application, const uint8_t *user, size_t userlen) 3043 { 3044 char *ret, *cp; 3045 size_t slen, i; 3046 3047 /* Trim off URL-like preamble */ 3048 if (strncmp(application, "ssh://", 6) == 0) 3049 ret = xstrdup(application + 6); 3050 else if (strncmp(application, "ssh:", 4) == 0) 3051 ret = xstrdup(application + 4); 3052 else 3053 ret = xstrdup(application); 3054 3055 /* Count trailing zeros in user */ 3056 for (i = 0; i < userlen; i++) { 3057 if (user[userlen - i - 1] != 0) 3058 break; 3059 } 3060 if (i >= userlen) 3061 return ret; /* user-id was default all-zeros */ 3062 3063 /* Append user-id, escaping non-UTF-8 characters */ 3064 slen = userlen - i; 3065 if (asmprintf(&cp, INT_MAX, NULL, "%.*s", (int)slen, user) == -1) 3066 fatal_f("asmprintf failed"); 3067 /* Don't emit a user-id that contains path or control characters */ 3068 if (strchr(cp, '/') != NULL || strstr(cp, "..") != NULL || 3069 strchr(cp, '\\') != NULL) { 3070 free(cp); 3071 cp = tohex(user, slen); 3072 } 3073 xextendf(&ret, "_", "%s", cp); 3074 free(cp); 3075 return ret; 3076 } 3077 3078 static int 3079 do_download_sk(const char *skprovider, const char *device) 3080 { 3081 struct sshsk_resident_key **srks; 3082 size_t nsrks, i; 3083 int r, ret = -1; 3084 char *fp, *pin = NULL, *pass = NULL, *path, *pubpath; 3085 const char *ext; 3086 struct sshkey *key; 3087 3088 if (skprovider == NULL) 3089 fatal("Cannot download keys without provider"); 3090 3091 pin = read_passphrase("Enter PIN for authenticator: ", RP_ALLOW_STDIN); 3092 if (!quiet) { 3093 printf("You may need to touch your authenticator " 3094 "to authorize key download.\n"); 3095 } 3096 if ((r = sshsk_load_resident(skprovider, device, pin, 0, 3097 &srks, &nsrks)) != 0) { 3098 if (pin != NULL) 3099 freezero(pin, strlen(pin)); 3100 error_r(r, "Unable to load resident keys"); 3101 return -1; 3102 } 3103 if (nsrks == 0) 3104 logit("No keys to download"); 3105 if (pin != NULL) 3106 freezero(pin, strlen(pin)); 3107 3108 for (i = 0; i < nsrks; i++) { 3109 key = srks[i]->key; 3110 if (key->type != KEY_ECDSA_SK && key->type != KEY_ED25519_SK) { 3111 error("Unsupported key type %s (%d)", 3112 sshkey_type(key), key->type); 3113 continue; 3114 } 3115 if ((fp = sshkey_fingerprint(key, fingerprint_hash, 3116 SSH_FP_DEFAULT)) == NULL) 3117 fatal_f("sshkey_fingerprint failed"); 3118 debug_f("key %zu: %s %s %s (flags 0x%02x)", i, 3119 sshkey_type(key), fp, key->sk_application, key->sk_flags); 3120 ext = sk_suffix(key->sk_application, 3121 srks[i]->user_id, srks[i]->user_id_len); 3122 xasprintf(&path, "id_%s_rk%s%s", 3123 key->type == KEY_ECDSA_SK ? "ecdsa_sk" : "ed25519_sk", 3124 *ext == '\0' ? "" : "_", ext); 3125 3126 /* If the file already exists, ask the user to confirm. */ 3127 if (!confirm_overwrite(path)) { 3128 free(path); 3129 break; 3130 } 3131 3132 /* Save the key with the application string as the comment */ 3133 if (pass == NULL) 3134 pass = private_key_passphrase(); 3135 if ((r = sshkey_save_private(key, path, pass, 3136 key->sk_application, private_key_format, 3137 openssh_format_cipher, rounds)) != 0) { 3138 error_r(r, "Saving key \"%s\" failed", path); 3139 free(path); 3140 break; 3141 } 3142 if (!quiet) { 3143 printf("Saved %s key%s%s to %s\n", sshkey_type(key), 3144 *ext != '\0' ? " " : "", 3145 *ext != '\0' ? key->sk_application : "", 3146 path); 3147 } 3148 3149 /* Save public key too */ 3150 xasprintf(&pubpath, "%s.pub", path); 3151 free(path); 3152 if ((r = sshkey_save_public(key, pubpath, 3153 key->sk_application)) != 0) { 3154 error_r(r, "Saving public key \"%s\" failed", pubpath); 3155 free(pubpath); 3156 break; 3157 } 3158 free(pubpath); 3159 } 3160 3161 if (i >= nsrks) 3162 ret = 0; /* success */ 3163 if (pass != NULL) 3164 freezero(pass, strlen(pass)); 3165 sshsk_free_resident_keys(srks, nsrks); 3166 return ret; 3167 } 3168 3169 static void 3170 save_attestation(struct sshbuf *attest, const char *path) 3171 { 3172 mode_t omask; 3173 int r; 3174 3175 if (path == NULL) 3176 return; /* nothing to do */ 3177 if (attest == NULL || sshbuf_len(attest) == 0) 3178 fatal("Enrollment did not return attestation data"); 3179 omask = umask(077); 3180 r = sshbuf_write_file(path, attest); 3181 umask(omask); 3182 if (r != 0) 3183 fatal_r(r, "Unable to write attestation data \"%s\"", path); 3184 if (!quiet) 3185 printf("Your FIDO attestation certificate has been saved in " 3186 "%s\n", path); 3187 } 3188 3189 static void 3190 usage(void) 3191 { 3192 fprintf(stderr, 3193 "usage: ssh-keygen [-q] [-a rounds] [-b bits] [-C comment] [-f output_keyfile]\n" 3194 " [-m format] [-N new_passphrase] [-O option]\n" 3195 " [-t dsa | ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa]\n" 3196 " [-w provider] [-Z cipher]\n" 3197 " ssh-keygen -p [-a rounds] [-f keyfile] [-m format] [-N new_passphrase]\n" 3198 " [-P old_passphrase] [-Z cipher]\n" 3199 #ifdef WITH_OPENSSL 3200 " ssh-keygen -i [-f input_keyfile] [-m key_format]\n" 3201 " ssh-keygen -e [-f input_keyfile] [-m key_format]\n" 3202 #endif 3203 " ssh-keygen -y [-f input_keyfile]\n" 3204 " ssh-keygen -c [-a rounds] [-C comment] [-f keyfile] [-P passphrase]\n" 3205 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n" 3206 " ssh-keygen -B [-f input_keyfile]\n"); 3207 #ifdef ENABLE_PKCS11 3208 fprintf(stderr, 3209 " ssh-keygen -D pkcs11\n"); 3210 #endif 3211 fprintf(stderr, 3212 " ssh-keygen -F hostname [-lv] [-f known_hosts_file]\n" 3213 " ssh-keygen -H [-f known_hosts_file]\n" 3214 " ssh-keygen -K [-a rounds] [-w provider]\n" 3215 " ssh-keygen -R hostname [-f known_hosts_file]\n" 3216 " ssh-keygen -r hostname [-g] [-f input_keyfile]\n" 3217 #ifdef WITH_OPENSSL 3218 " ssh-keygen -M generate [-O option] output_file\n" 3219 " ssh-keygen -M screen [-f input_file] [-O option] output_file\n" 3220 #endif 3221 " ssh-keygen -I certificate_identity -s ca_key [-hU] [-D pkcs11_provider]\n" 3222 " [-n principals] [-O option] [-V validity_interval]\n" 3223 " [-z serial_number] file ...\n" 3224 " ssh-keygen -L [-f input_keyfile]\n" 3225 " ssh-keygen -A [-a rounds] [-f prefix_path]\n" 3226 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n" 3227 " file ...\n" 3228 " ssh-keygen -Q [-l] -f krl_file [file ...]\n" 3229 " ssh-keygen -Y find-principals -s signature_file -f allowed_signers_file\n" 3230 " ssh-keygen -Y match-principals -I signer_identity -f allowed_signers_file\n" 3231 " ssh-keygen -Y check-novalidate -n namespace -s signature_file\n" 3232 " ssh-keygen -Y sign -f key_file -n namespace file [-O option] ...\n" 3233 " ssh-keygen -Y verify -f allowed_signers_file -I signer_identity\n" 3234 " -n namespace -s signature_file [-r krl_file] [-O option]\n"); 3235 exit(1); 3236 } 3237 3238 /* 3239 * Main program for key management. 3240 */ 3241 int 3242 main(int argc, char **argv) 3243 { 3244 char comment[1024], *passphrase; 3245 char *rr_hostname = NULL, *ep, *fp, *ra; 3246 struct sshkey *private, *public; 3247 struct passwd *pw; 3248 int r, opt, type; 3249 int change_passphrase = 0, change_comment = 0, show_cert = 0; 3250 int find_host = 0, delete_host = 0, hash_hosts = 0; 3251 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0; 3252 int prefer_agent = 0, convert_to = 0, convert_from = 0; 3253 int print_public = 0, print_generic = 0, cert_serial_autoinc = 0; 3254 int do_gen_candidates = 0, do_screen_candidates = 0, download_sk = 0; 3255 unsigned long long cert_serial = 0; 3256 char *identity_comment = NULL, *ca_key_path = NULL, **opts = NULL; 3257 char *sk_application = NULL, *sk_device = NULL, *sk_user = NULL; 3258 char *sk_attestation_path = NULL; 3259 struct sshbuf *challenge = NULL, *attest = NULL; 3260 size_t i, nopts = 0; 3261 u_int32_t bits = 0; 3262 uint8_t sk_flags = SSH_SK_USER_PRESENCE_REQD; 3263 const char *errstr; 3264 int log_level = SYSLOG_LEVEL_INFO; 3265 char *sign_op = NULL; 3266 3267 extern int optind; 3268 extern char *optarg; 3269 3270 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 3271 sanitise_stdfd(); 3272 3273 __progname = ssh_get_progname(argv[0]); 3274 3275 seed_rng(); 3276 3277 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 3278 3279 msetlocale(); 3280 3281 /* we need this for the home * directory. */ 3282 pw = getpwuid(getuid()); 3283 if (!pw) 3284 fatal("No user exists for uid %lu", (u_long)getuid()); 3285 pw = pwcopy(pw); 3286 if (gethostname(hostname, sizeof(hostname)) == -1) 3287 fatal("gethostname: %s", strerror(errno)); 3288 3289 sk_provider = getenv("SSH_SK_PROVIDER"); 3290 3291 /* Remaining characters: dGjJSTWx */ 3292 while ((opt = getopt(argc, argv, "ABHKLQUXceghiklopquvy" 3293 "C:D:E:F:I:M:N:O:P:R:V:Y:Z:" 3294 "a:b:f:g:m:n:r:s:t:w:z:")) != -1) { 3295 switch (opt) { 3296 case 'A': 3297 gen_all_hostkeys = 1; 3298 break; 3299 case 'b': 3300 bits = (u_int32_t)strtonum(optarg, 1, UINT32_MAX, 3301 &errstr); 3302 if (errstr) 3303 fatal("Bits has bad value %s (%s)", 3304 optarg, errstr); 3305 break; 3306 case 'E': 3307 fingerprint_hash = ssh_digest_alg_by_name(optarg); 3308 if (fingerprint_hash == -1) 3309 fatal("Invalid hash algorithm \"%s\"", optarg); 3310 break; 3311 case 'F': 3312 find_host = 1; 3313 rr_hostname = optarg; 3314 break; 3315 case 'H': 3316 hash_hosts = 1; 3317 break; 3318 case 'I': 3319 cert_key_id = optarg; 3320 break; 3321 case 'R': 3322 delete_host = 1; 3323 rr_hostname = optarg; 3324 break; 3325 case 'L': 3326 show_cert = 1; 3327 break; 3328 case 'l': 3329 print_fingerprint = 1; 3330 break; 3331 case 'B': 3332 print_bubblebabble = 1; 3333 break; 3334 case 'm': 3335 if (strcasecmp(optarg, "RFC4716") == 0 || 3336 strcasecmp(optarg, "ssh2") == 0) { 3337 convert_format = FMT_RFC4716; 3338 break; 3339 } 3340 if (strcasecmp(optarg, "PKCS8") == 0) { 3341 convert_format = FMT_PKCS8; 3342 private_key_format = SSHKEY_PRIVATE_PKCS8; 3343 break; 3344 } 3345 if (strcasecmp(optarg, "PEM") == 0) { 3346 convert_format = FMT_PEM; 3347 private_key_format = SSHKEY_PRIVATE_PEM; 3348 break; 3349 } 3350 fatal("Unsupported conversion format \"%s\"", optarg); 3351 case 'n': 3352 cert_principals = optarg; 3353 break; 3354 case 'o': 3355 /* no-op; new format is already the default */ 3356 break; 3357 case 'p': 3358 change_passphrase = 1; 3359 break; 3360 case 'c': 3361 change_comment = 1; 3362 break; 3363 case 'f': 3364 if (strlcpy(identity_file, optarg, 3365 sizeof(identity_file)) >= sizeof(identity_file)) 3366 fatal("Identity filename too long"); 3367 have_identity = 1; 3368 break; 3369 case 'g': 3370 print_generic = 1; 3371 break; 3372 case 'K': 3373 download_sk = 1; 3374 break; 3375 case 'P': 3376 identity_passphrase = optarg; 3377 break; 3378 case 'N': 3379 identity_new_passphrase = optarg; 3380 break; 3381 case 'Q': 3382 check_krl = 1; 3383 break; 3384 case 'O': 3385 opts = xrecallocarray(opts, nopts, nopts + 1, 3386 sizeof(*opts)); 3387 opts[nopts++] = xstrdup(optarg); 3388 break; 3389 case 'Z': 3390 openssh_format_cipher = optarg; 3391 if (cipher_by_name(openssh_format_cipher) == NULL) 3392 fatal("Invalid OpenSSH-format cipher '%s'", 3393 openssh_format_cipher); 3394 break; 3395 case 'C': 3396 identity_comment = optarg; 3397 break; 3398 case 'q': 3399 quiet = 1; 3400 break; 3401 case 'e': 3402 /* export key */ 3403 convert_to = 1; 3404 break; 3405 case 'h': 3406 cert_key_type = SSH2_CERT_TYPE_HOST; 3407 certflags_flags = 0; 3408 break; 3409 case 'k': 3410 gen_krl = 1; 3411 break; 3412 case 'i': 3413 case 'X': 3414 /* import key */ 3415 convert_from = 1; 3416 break; 3417 case 'y': 3418 print_public = 1; 3419 break; 3420 case 's': 3421 ca_key_path = optarg; 3422 break; 3423 case 't': 3424 key_type_name = optarg; 3425 break; 3426 case 'D': 3427 pkcs11provider = optarg; 3428 break; 3429 case 'U': 3430 prefer_agent = 1; 3431 break; 3432 case 'u': 3433 update_krl = 1; 3434 break; 3435 case 'v': 3436 if (log_level == SYSLOG_LEVEL_INFO) 3437 log_level = SYSLOG_LEVEL_DEBUG1; 3438 else { 3439 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 3440 log_level < SYSLOG_LEVEL_DEBUG3) 3441 log_level++; 3442 } 3443 break; 3444 case 'r': 3445 rr_hostname = optarg; 3446 break; 3447 case 'a': 3448 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr); 3449 if (errstr) 3450 fatal("Invalid number: %s (%s)", 3451 optarg, errstr); 3452 break; 3453 case 'V': 3454 parse_cert_times(optarg); 3455 break; 3456 case 'Y': 3457 sign_op = optarg; 3458 break; 3459 case 'w': 3460 sk_provider = optarg; 3461 break; 3462 case 'z': 3463 errno = 0; 3464 if (*optarg == '+') { 3465 cert_serial_autoinc = 1; 3466 optarg++; 3467 } 3468 cert_serial = strtoull(optarg, &ep, 10); 3469 if (*optarg < '0' || *optarg > '9' || *ep != '\0' || 3470 (errno == ERANGE && cert_serial == ULLONG_MAX)) 3471 fatal("Invalid serial number \"%s\"", optarg); 3472 break; 3473 case 'M': 3474 if (strcmp(optarg, "generate") == 0) 3475 do_gen_candidates = 1; 3476 else if (strcmp(optarg, "screen") == 0) 3477 do_screen_candidates = 1; 3478 else 3479 fatal("Unsupported moduli option %s", optarg); 3480 break; 3481 case '?': 3482 default: 3483 usage(); 3484 } 3485 } 3486 3487 #ifdef ENABLE_SK_INTERNAL 3488 if (sk_provider == NULL) 3489 sk_provider = "internal"; 3490 #endif 3491 3492 /* reinit */ 3493 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); 3494 3495 argv += optind; 3496 argc -= optind; 3497 3498 if (sign_op != NULL) { 3499 if (strncmp(sign_op, "find-principals", 15) == 0) { 3500 if (ca_key_path == NULL) { 3501 error("Too few arguments for find-principals:" 3502 "missing signature file"); 3503 exit(1); 3504 } 3505 if (!have_identity) { 3506 error("Too few arguments for find-principals:" 3507 "missing allowed keys file"); 3508 exit(1); 3509 } 3510 return sig_find_principals(ca_key_path, identity_file, 3511 opts, nopts); 3512 } else if (strncmp(sign_op, "match-principals", 16) == 0) { 3513 if (!have_identity) { 3514 error("Too few arguments for match-principals:" 3515 "missing allowed keys file"); 3516 exit(1); 3517 } 3518 if (cert_key_id == NULL) { 3519 error("Too few arguments for match-principals: " 3520 "missing principal ID"); 3521 exit(1); 3522 } 3523 return sig_match_principals(identity_file, cert_key_id, 3524 opts, nopts); 3525 } else if (strncmp(sign_op, "sign", 4) == 0) { 3526 /* NB. cert_principals is actually namespace, via -n */ 3527 if (cert_principals == NULL || 3528 *cert_principals == '\0') { 3529 error("Too few arguments for sign: " 3530 "missing namespace"); 3531 exit(1); 3532 } 3533 if (!have_identity) { 3534 error("Too few arguments for sign: " 3535 "missing key"); 3536 exit(1); 3537 } 3538 return sig_sign(identity_file, cert_principals, 3539 argc, argv, opts, nopts); 3540 } else if (strncmp(sign_op, "check-novalidate", 16) == 0) { 3541 /* NB. cert_principals is actually namespace, via -n */ 3542 if (cert_principals == NULL || 3543 *cert_principals == '\0') { 3544 error("Too few arguments for check-novalidate: " 3545 "missing namespace"); 3546 exit(1); 3547 } 3548 if (ca_key_path == NULL) { 3549 error("Too few arguments for check-novalidate: " 3550 "missing signature file"); 3551 exit(1); 3552 } 3553 return sig_verify(ca_key_path, cert_principals, 3554 NULL, NULL, NULL, opts, nopts); 3555 } else if (strncmp(sign_op, "verify", 6) == 0) { 3556 /* NB. cert_principals is actually namespace, via -n */ 3557 if (cert_principals == NULL || 3558 *cert_principals == '\0') { 3559 error("Too few arguments for verify: " 3560 "missing namespace"); 3561 exit(1); 3562 } 3563 if (ca_key_path == NULL) { 3564 error("Too few arguments for verify: " 3565 "missing signature file"); 3566 exit(1); 3567 } 3568 if (!have_identity) { 3569 error("Too few arguments for sign: " 3570 "missing allowed keys file"); 3571 exit(1); 3572 } 3573 if (cert_key_id == NULL) { 3574 error("Too few arguments for verify: " 3575 "missing principal identity"); 3576 exit(1); 3577 } 3578 return sig_verify(ca_key_path, cert_principals, 3579 cert_key_id, identity_file, rr_hostname, 3580 opts, nopts); 3581 } 3582 error("Unsupported operation for -Y: \"%s\"", sign_op); 3583 usage(); 3584 /* NOTREACHED */ 3585 } 3586 3587 if (ca_key_path != NULL) { 3588 if (argc < 1 && !gen_krl) { 3589 error("Too few arguments."); 3590 usage(); 3591 } 3592 } else if (argc > 0 && !gen_krl && !check_krl && 3593 !do_gen_candidates && !do_screen_candidates) { 3594 error("Too many arguments."); 3595 usage(); 3596 } 3597 if (change_passphrase && change_comment) { 3598 error("Can only have one of -p and -c."); 3599 usage(); 3600 } 3601 if (print_fingerprint && (delete_host || hash_hosts)) { 3602 error("Cannot use -l with -H or -R."); 3603 usage(); 3604 } 3605 if (gen_krl) { 3606 do_gen_krl(pw, update_krl, ca_key_path, 3607 cert_serial, identity_comment, argc, argv); 3608 return (0); 3609 } 3610 if (check_krl) { 3611 do_check_krl(pw, print_fingerprint, argc, argv); 3612 return (0); 3613 } 3614 if (ca_key_path != NULL) { 3615 if (cert_key_id == NULL) 3616 fatal("Must specify key id (-I) when certifying"); 3617 for (i = 0; i < nopts; i++) 3618 add_cert_option(opts[i]); 3619 do_ca_sign(pw, ca_key_path, prefer_agent, 3620 cert_serial, cert_serial_autoinc, argc, argv); 3621 } 3622 if (show_cert) 3623 do_show_cert(pw); 3624 if (delete_host || hash_hosts || find_host) { 3625 do_known_hosts(pw, rr_hostname, find_host, 3626 delete_host, hash_hosts); 3627 } 3628 if (pkcs11provider != NULL) 3629 do_download(pw); 3630 if (download_sk) { 3631 for (i = 0; i < nopts; i++) { 3632 if (strncasecmp(opts[i], "device=", 7) == 0) { 3633 sk_device = xstrdup(opts[i] + 7); 3634 } else { 3635 fatal("Option \"%s\" is unsupported for " 3636 "FIDO authenticator download", opts[i]); 3637 } 3638 } 3639 return do_download_sk(sk_provider, sk_device); 3640 } 3641 if (print_fingerprint || print_bubblebabble) 3642 do_fingerprint(pw); 3643 if (change_passphrase) 3644 do_change_passphrase(pw); 3645 if (change_comment) 3646 do_change_comment(pw, identity_comment); 3647 #ifdef WITH_OPENSSL 3648 if (convert_to) 3649 do_convert_to(pw); 3650 if (convert_from) 3651 do_convert_from(pw); 3652 #else /* WITH_OPENSSL */ 3653 if (convert_to || convert_from) 3654 fatal("key conversion disabled at compile time"); 3655 #endif /* WITH_OPENSSL */ 3656 if (print_public) 3657 do_print_public(pw); 3658 if (rr_hostname != NULL) { 3659 unsigned int n = 0; 3660 3661 if (have_identity) { 3662 n = do_print_resource_record(pw, identity_file, 3663 rr_hostname, print_generic); 3664 if (n == 0) 3665 fatal("%s: %s", identity_file, strerror(errno)); 3666 exit(0); 3667 } else { 3668 3669 n += do_print_resource_record(pw, 3670 _PATH_HOST_RSA_KEY_FILE, rr_hostname, 3671 print_generic); 3672 n += do_print_resource_record(pw, 3673 _PATH_HOST_DSA_KEY_FILE, rr_hostname, 3674 print_generic); 3675 n += do_print_resource_record(pw, 3676 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname, 3677 print_generic); 3678 n += do_print_resource_record(pw, 3679 _PATH_HOST_ED25519_KEY_FILE, rr_hostname, 3680 print_generic); 3681 n += do_print_resource_record(pw, 3682 _PATH_HOST_XMSS_KEY_FILE, rr_hostname, 3683 print_generic); 3684 if (n == 0) 3685 fatal("no keys found."); 3686 exit(0); 3687 } 3688 } 3689 3690 if (do_gen_candidates || do_screen_candidates) { 3691 if (argc <= 0) 3692 fatal("No output file specified"); 3693 else if (argc > 1) 3694 fatal("Too many output files specified"); 3695 } 3696 if (do_gen_candidates) { 3697 do_moduli_gen(argv[0], opts, nopts); 3698 return 0; 3699 } 3700 if (do_screen_candidates) { 3701 do_moduli_screen(argv[0], opts, nopts); 3702 return 0; 3703 } 3704 3705 if (gen_all_hostkeys) { 3706 do_gen_all_hostkeys(pw); 3707 return (0); 3708 } 3709 3710 if (key_type_name == NULL) 3711 key_type_name = DEFAULT_KEY_TYPE_NAME; 3712 3713 type = sshkey_type_from_name(key_type_name); 3714 type_bits_valid(type, key_type_name, &bits); 3715 3716 if (!quiet) 3717 printf("Generating public/private %s key pair.\n", 3718 key_type_name); 3719 switch (type) { 3720 case KEY_ECDSA_SK: 3721 case KEY_ED25519_SK: 3722 for (i = 0; i < nopts; i++) { 3723 if (strcasecmp(opts[i], "no-touch-required") == 0) { 3724 sk_flags &= ~SSH_SK_USER_PRESENCE_REQD; 3725 } else if (strcasecmp(opts[i], "verify-required") == 0) { 3726 sk_flags |= SSH_SK_USER_VERIFICATION_REQD; 3727 } else if (strcasecmp(opts[i], "resident") == 0) { 3728 sk_flags |= SSH_SK_RESIDENT_KEY; 3729 } else if (strncasecmp(opts[i], "device=", 7) == 0) { 3730 sk_device = xstrdup(opts[i] + 7); 3731 } else if (strncasecmp(opts[i], "user=", 5) == 0) { 3732 sk_user = xstrdup(opts[i] + 5); 3733 } else if (strncasecmp(opts[i], "challenge=", 10) == 0) { 3734 if ((r = sshbuf_load_file(opts[i] + 10, 3735 &challenge)) != 0) { 3736 fatal_r(r, "Unable to load FIDO " 3737 "enrollment challenge \"%s\"", 3738 opts[i] + 10); 3739 } 3740 } else if (strncasecmp(opts[i], 3741 "write-attestation=", 18) == 0) { 3742 sk_attestation_path = opts[i] + 18; 3743 } else if (strncasecmp(opts[i], 3744 "application=", 12) == 0) { 3745 sk_application = xstrdup(opts[i] + 12); 3746 if (strncmp(sk_application, "ssh:", 4) != 0) { 3747 fatal("FIDO application string must " 3748 "begin with \"ssh:\""); 3749 } 3750 } else { 3751 fatal("Option \"%s\" is unsupported for " 3752 "FIDO authenticator enrollment", opts[i]); 3753 } 3754 } 3755 if (!quiet) { 3756 printf("You may need to touch your authenticator " 3757 "to authorize key generation.\n"); 3758 } 3759 if ((attest = sshbuf_new()) == NULL) 3760 fatal("sshbuf_new failed"); 3761 if ((sk_flags & 3762 (SSH_SK_USER_VERIFICATION_REQD|SSH_SK_RESIDENT_KEY))) { 3763 passphrase = read_passphrase("Enter PIN for " 3764 "authenticator: ", RP_ALLOW_STDIN); 3765 } else { 3766 passphrase = NULL; 3767 } 3768 for (i = 0 ; ; i++) { 3769 fflush(stdout); 3770 r = sshsk_enroll(type, sk_provider, sk_device, 3771 sk_application == NULL ? "ssh:" : sk_application, 3772 sk_user, sk_flags, passphrase, challenge, 3773 &private, attest); 3774 if (r == 0) 3775 break; 3776 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) 3777 fatal_r(r, "Key enrollment failed"); 3778 else if (passphrase != NULL) { 3779 error("PIN incorrect"); 3780 freezero(passphrase, strlen(passphrase)); 3781 passphrase = NULL; 3782 } 3783 if (i >= 3) 3784 fatal("Too many incorrect PINs"); 3785 passphrase = read_passphrase("Enter PIN for " 3786 "authenticator: ", RP_ALLOW_STDIN); 3787 if (!quiet) { 3788 printf("You may need to touch your " 3789 "authenticator (again) to authorize " 3790 "key generation.\n"); 3791 } 3792 } 3793 if (passphrase != NULL) { 3794 freezero(passphrase, strlen(passphrase)); 3795 passphrase = NULL; 3796 } 3797 break; 3798 default: 3799 if ((r = sshkey_generate(type, bits, &private)) != 0) 3800 fatal("sshkey_generate failed"); 3801 break; 3802 } 3803 if ((r = sshkey_from_private(private, &public)) != 0) 3804 fatal_r(r, "sshkey_from_private"); 3805 3806 if (!have_identity) 3807 ask_filename(pw, "Enter file in which to save the key"); 3808 3809 /* Create ~/.ssh directory if it doesn't already exist. */ 3810 hostfile_create_user_ssh_dir(identity_file, !quiet); 3811 3812 /* If the file already exists, ask the user to confirm. */ 3813 if (!confirm_overwrite(identity_file)) 3814 exit(1); 3815 3816 /* Determine the passphrase for the private key */ 3817 passphrase = private_key_passphrase(); 3818 if (identity_comment) { 3819 strlcpy(comment, identity_comment, sizeof(comment)); 3820 } else { 3821 /* Create default comment field for the passphrase. */ 3822 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 3823 } 3824 3825 /* Save the key with the given passphrase and comment. */ 3826 if ((r = sshkey_save_private(private, identity_file, passphrase, 3827 comment, private_key_format, openssh_format_cipher, rounds)) != 0) { 3828 error_r(r, "Saving key \"%s\" failed", identity_file); 3829 freezero(passphrase, strlen(passphrase)); 3830 exit(1); 3831 } 3832 freezero(passphrase, strlen(passphrase)); 3833 sshkey_free(private); 3834 3835 if (!quiet) { 3836 printf("Your identification has been saved in %s\n", 3837 identity_file); 3838 } 3839 3840 strlcat(identity_file, ".pub", sizeof(identity_file)); 3841 if ((r = sshkey_save_public(public, identity_file, comment)) != 0) 3842 fatal_r(r, "Unable to save public key to %s", identity_file); 3843 3844 if (!quiet) { 3845 fp = sshkey_fingerprint(public, fingerprint_hash, 3846 SSH_FP_DEFAULT); 3847 ra = sshkey_fingerprint(public, fingerprint_hash, 3848 SSH_FP_RANDOMART); 3849 if (fp == NULL || ra == NULL) 3850 fatal("sshkey_fingerprint failed"); 3851 printf("Your public key has been saved in %s\n", 3852 identity_file); 3853 printf("The key fingerprint is:\n"); 3854 printf("%s %s\n", fp, comment); 3855 printf("The key's randomart image is:\n"); 3856 printf("%s\n", ra); 3857 free(ra); 3858 free(fp); 3859 } 3860 3861 if (sk_attestation_path != NULL) 3862 save_attestation(attest, sk_attestation_path); 3863 3864 sshbuf_free(attest); 3865 sshkey_free(public); 3866 3867 exit(0); 3868 } 3869