1 /* $NetBSD: sshkey.c,v 1.27 2021/09/02 11:26:18 christos Exp $ */ 2 /* $OpenBSD: sshkey.c,v 1.119 2021/07/23 03:37:52 djm Exp $ */ 3 4 /* 5 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. 6 * Copyright (c) 2008 Alexander von Gernler. All rights reserved. 7 * Copyright (c) 2010,2011 Damien Miller. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 #include "includes.h" 30 __RCSID("$NetBSD: sshkey.c,v 1.27 2021/09/02 11:26:18 christos Exp $"); 31 32 #include <sys/types.h> 33 #include <netinet/in.h> 34 35 #ifdef WITH_OPENSSL 36 #include <openssl/evp.h> 37 #include <openssl/err.h> 38 #include <openssl/pem.h> 39 #endif 40 41 #include "crypto_api.h" 42 43 #include <errno.h> 44 #include <stdio.h> 45 #include <string.h> 46 #include <util.h> 47 #include <limits.h> 48 #include <resolv.h> 49 50 #include "ssh2.h" 51 #include "ssherr.h" 52 #include "misc.h" 53 #include "sshbuf.h" 54 #include "cipher.h" 55 #include "digest.h" 56 #define SSHKEY_INTERNAL 57 #include "sshkey.h" 58 #include "match.h" 59 #include "ssh-sk.h" 60 61 #ifdef WITH_XMSS 62 #include "sshkey-xmss.h" 63 #include "xmss_fast.h" 64 #endif 65 66 /* openssh private key file format */ 67 #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n" 68 #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n" 69 #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1) 70 #define MARK_END_LEN (sizeof(MARK_END) - 1) 71 #define KDFNAME "bcrypt" 72 #define AUTH_MAGIC "openssh-key-v1" 73 #define SALT_LEN 16 74 #define DEFAULT_CIPHERNAME "aes256-ctr" 75 #define DEFAULT_ROUNDS 16 76 77 /* Version identification string for SSH v1 identity files. */ 78 #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n" 79 80 /* 81 * Constants relating to "shielding" support; protection of keys expected 82 * to remain in memory for long durations 83 */ 84 #define SSHKEY_SHIELD_PREKEY_LEN (16 * 1024) 85 #define SSHKEY_SHIELD_CIPHER "aes256-ctr" /* XXX want AES-EME* */ 86 #define SSHKEY_SHIELD_PREKEY_HASH SSH_DIGEST_SHA512 87 88 int sshkey_private_serialize_opt(struct sshkey *key, 89 struct sshbuf *buf, enum sshkey_serialize_rep); 90 static int sshkey_from_blob_internal(struct sshbuf *buf, 91 struct sshkey **keyp, int allow_cert); 92 93 /* Supported key types */ 94 struct keytype { 95 const char *name; 96 const char *shortname; 97 const char *sigalg; 98 int type; 99 int nid; 100 int cert; 101 int sigonly; 102 }; 103 static const struct keytype keytypes[] = { 104 { "ssh-ed25519", "ED25519", NULL, KEY_ED25519, 0, 0, 0 }, 105 { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT", NULL, 106 KEY_ED25519_CERT, 0, 1, 0 }, 107 { "sk-ssh-ed25519@openssh.com", "ED25519-SK", NULL, 108 KEY_ED25519_SK, 0, 0, 0 }, 109 { "sk-ssh-ed25519-cert-v01@openssh.com", "ED25519-SK-CERT", NULL, 110 KEY_ED25519_SK_CERT, 0, 1, 0 }, 111 #ifdef WITH_XMSS 112 { "ssh-xmss@openssh.com", "XMSS", NULL, KEY_XMSS, 0, 0, 0 }, 113 { "ssh-xmss-cert-v01@openssh.com", "XMSS-CERT", NULL, 114 KEY_XMSS_CERT, 0, 1, 0 }, 115 #endif /* WITH_XMSS */ 116 #ifdef WITH_OPENSSL 117 { "ssh-rsa", "RSA", NULL, KEY_RSA, 0, 0, 0 }, 118 { "rsa-sha2-256", "RSA", NULL, KEY_RSA, 0, 0, 1 }, 119 { "rsa-sha2-512", "RSA", NULL, KEY_RSA, 0, 0, 1 }, 120 { "ssh-dss", "DSA", NULL, KEY_DSA, 0, 0, 0 }, 121 { "ecdsa-sha2-nistp256", "ECDSA", NULL, 122 KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 }, 123 { "ecdsa-sha2-nistp384", "ECDSA", NULL, 124 KEY_ECDSA, NID_secp384r1, 0, 0 }, 125 { "ecdsa-sha2-nistp521", "ECDSA", NULL, 126 KEY_ECDSA, NID_secp521r1, 0, 0 }, 127 { "sk-ecdsa-sha2-nistp256@openssh.com", "ECDSA-SK", NULL, 128 KEY_ECDSA_SK, NID_X9_62_prime256v1, 0, 0 }, 129 { "webauthn-sk-ecdsa-sha2-nistp256@openssh.com", "ECDSA-SK", NULL, 130 KEY_ECDSA_SK, NID_X9_62_prime256v1, 0, 1 }, 131 { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", NULL, 132 KEY_RSA_CERT, 0, 1, 0 }, 133 { "rsa-sha2-256-cert-v01@openssh.com", "RSA-CERT", 134 "rsa-sha2-256", KEY_RSA_CERT, 0, 1, 1 }, 135 { "rsa-sha2-512-cert-v01@openssh.com", "RSA-CERT", 136 "rsa-sha2-512", KEY_RSA_CERT, 0, 1, 1 }, 137 { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", NULL, 138 KEY_DSA_CERT, 0, 1, 0 }, 139 { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT", NULL, 140 KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 }, 141 { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT", NULL, 142 KEY_ECDSA_CERT, NID_secp384r1, 1, 0 }, 143 { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT", NULL, 144 KEY_ECDSA_CERT, NID_secp521r1, 1, 0 }, 145 { "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-SK-CERT", NULL, 146 KEY_ECDSA_SK_CERT, NID_X9_62_prime256v1, 1, 0 }, 147 #endif /* WITH_OPENSSL */ 148 { NULL, NULL, NULL, -1, -1, 0, 0 } 149 }; 150 151 const char * 152 sshkey_type(const struct sshkey *k) 153 { 154 const struct keytype *kt; 155 156 for (kt = keytypes; kt->type != -1; kt++) { 157 if (kt->type == k->type) 158 return kt->shortname; 159 } 160 return "unknown"; 161 } 162 163 static const char * 164 sshkey_ssh_name_from_type_nid(int type, int nid) 165 { 166 const struct keytype *kt; 167 168 for (kt = keytypes; kt->type != -1; kt++) { 169 if (kt->type == type && (kt->nid == 0 || kt->nid == nid)) 170 return kt->name; 171 } 172 return "ssh-unknown"; 173 } 174 175 int 176 sshkey_type_is_cert(int type) 177 { 178 const struct keytype *kt; 179 180 for (kt = keytypes; kt->type != -1; kt++) { 181 if (kt->type == type) 182 return kt->cert; 183 } 184 return 0; 185 } 186 187 const char * 188 sshkey_ssh_name(const struct sshkey *k) 189 { 190 return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid); 191 } 192 193 const char * 194 sshkey_ssh_name_plain(const struct sshkey *k) 195 { 196 return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type), 197 k->ecdsa_nid); 198 } 199 200 int 201 sshkey_type_from_name(const char *name) 202 { 203 const struct keytype *kt; 204 205 for (kt = keytypes; kt->type != -1; kt++) { 206 /* Only allow shortname matches for plain key types */ 207 if ((kt->name != NULL && strcmp(name, kt->name) == 0) || 208 (!kt->cert && strcasecmp(kt->shortname, name) == 0)) 209 return kt->type; 210 } 211 return KEY_UNSPEC; 212 } 213 214 static int 215 key_type_is_ecdsa_variant(int type) 216 { 217 switch (type) { 218 case KEY_ECDSA: 219 case KEY_ECDSA_CERT: 220 case KEY_ECDSA_SK: 221 case KEY_ECDSA_SK_CERT: 222 return 1; 223 } 224 return 0; 225 } 226 227 int 228 sshkey_ecdsa_nid_from_name(const char *name) 229 { 230 const struct keytype *kt; 231 232 for (kt = keytypes; kt->type != -1; kt++) { 233 if (!key_type_is_ecdsa_variant(kt->type)) 234 continue; 235 if (kt->name != NULL && strcmp(name, kt->name) == 0) 236 return kt->nid; 237 } 238 return -1; 239 } 240 241 char * 242 sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep) 243 { 244 char *tmp, *ret = NULL; 245 size_t nlen, rlen = 0; 246 const struct keytype *kt; 247 248 for (kt = keytypes; kt->type != -1; kt++) { 249 if (kt->name == NULL) 250 continue; 251 if (!include_sigonly && kt->sigonly) 252 continue; 253 if ((certs_only && !kt->cert) || (plain_only && kt->cert)) 254 continue; 255 if (ret != NULL) 256 ret[rlen++] = sep; 257 nlen = strlen(kt->name); 258 if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) { 259 free(ret); 260 return NULL; 261 } 262 ret = tmp; 263 memcpy(ret + rlen, kt->name, nlen + 1); 264 rlen += nlen; 265 } 266 return ret; 267 } 268 269 int 270 sshkey_names_valid2(const char *names, int allow_wildcard) 271 { 272 char *s, *cp, *p; 273 const struct keytype *kt; 274 int type; 275 276 if (names == NULL || strcmp(names, "") == 0) 277 return 0; 278 if ((s = cp = strdup(names)) == NULL) 279 return 0; 280 for ((p = strsep(&cp, ",")); p && *p != '\0'; 281 (p = strsep(&cp, ","))) { 282 type = sshkey_type_from_name(p); 283 if (type == KEY_UNSPEC) { 284 if (allow_wildcard) { 285 /* 286 * Try matching key types against the string. 287 * If any has a positive or negative match then 288 * the component is accepted. 289 */ 290 for (kt = keytypes; kt->type != -1; kt++) { 291 if (match_pattern_list(kt->name, 292 p, 0) != 0) 293 break; 294 } 295 if (kt->type != -1) 296 continue; 297 } 298 free(s); 299 return 0; 300 } 301 } 302 free(s); 303 return 1; 304 } 305 306 u_int 307 sshkey_size(const struct sshkey *k) 308 { 309 #ifdef WITH_OPENSSL 310 const BIGNUM *rsa_n, *dsa_p; 311 #endif /* WITH_OPENSSL */ 312 313 switch (k->type) { 314 #ifdef WITH_OPENSSL 315 case KEY_RSA: 316 case KEY_RSA_CERT: 317 if (k->rsa == NULL) 318 return 0; 319 RSA_get0_key(k->rsa, &rsa_n, NULL, NULL); 320 return BN_num_bits(rsa_n); 321 case KEY_DSA: 322 case KEY_DSA_CERT: 323 if (k->dsa == NULL) 324 return 0; 325 DSA_get0_pqg(k->dsa, &dsa_p, NULL, NULL); 326 return BN_num_bits(dsa_p); 327 case KEY_ECDSA: 328 case KEY_ECDSA_CERT: 329 case KEY_ECDSA_SK: 330 case KEY_ECDSA_SK_CERT: 331 return sshkey_curve_nid_to_bits(k->ecdsa_nid); 332 #endif /* WITH_OPENSSL */ 333 case KEY_ED25519: 334 case KEY_ED25519_CERT: 335 case KEY_ED25519_SK: 336 case KEY_ED25519_SK_CERT: 337 case KEY_XMSS: 338 case KEY_XMSS_CERT: 339 return 256; /* XXX */ 340 } 341 return 0; 342 } 343 344 static int 345 sshkey_type_is_valid_ca(int type) 346 { 347 switch (type) { 348 case KEY_RSA: 349 case KEY_DSA: 350 case KEY_ECDSA: 351 case KEY_ECDSA_SK: 352 case KEY_ED25519: 353 case KEY_ED25519_SK: 354 case KEY_XMSS: 355 return 1; 356 default: 357 return 0; 358 } 359 } 360 361 int 362 sshkey_is_cert(const struct sshkey *k) 363 { 364 if (k == NULL) 365 return 0; 366 return sshkey_type_is_cert(k->type); 367 } 368 369 int 370 sshkey_is_sk(const struct sshkey *k) 371 { 372 if (k == NULL) 373 return 0; 374 switch (sshkey_type_plain(k->type)) { 375 case KEY_ECDSA_SK: 376 case KEY_ED25519_SK: 377 return 1; 378 default: 379 return 0; 380 } 381 } 382 383 /* Return the cert-less equivalent to a certified key type */ 384 int 385 sshkey_type_plain(int type) 386 { 387 switch (type) { 388 case KEY_RSA_CERT: 389 return KEY_RSA; 390 case KEY_DSA_CERT: 391 return KEY_DSA; 392 case KEY_ECDSA_CERT: 393 return KEY_ECDSA; 394 case KEY_ECDSA_SK_CERT: 395 return KEY_ECDSA_SK; 396 case KEY_ED25519_CERT: 397 return KEY_ED25519; 398 case KEY_ED25519_SK_CERT: 399 return KEY_ED25519_SK; 400 case KEY_XMSS_CERT: 401 return KEY_XMSS; 402 default: 403 return type; 404 } 405 } 406 407 #ifdef WITH_OPENSSL 408 /* XXX: these are really begging for a table-driven approach */ 409 int 410 sshkey_curve_name_to_nid(const char *name) 411 { 412 if (strcmp(name, "nistp256") == 0) 413 return NID_X9_62_prime256v1; 414 else if (strcmp(name, "nistp384") == 0) 415 return NID_secp384r1; 416 else if (strcmp(name, "nistp521") == 0) 417 return NID_secp521r1; 418 else 419 return -1; 420 } 421 422 u_int 423 sshkey_curve_nid_to_bits(int nid) 424 { 425 switch (nid) { 426 case NID_X9_62_prime256v1: 427 return 256; 428 case NID_secp384r1: 429 return 384; 430 case NID_secp521r1: 431 return 521; 432 default: 433 return 0; 434 } 435 } 436 437 int 438 sshkey_ecdsa_bits_to_nid(int bits) 439 { 440 switch (bits) { 441 case 256: 442 return NID_X9_62_prime256v1; 443 case 384: 444 return NID_secp384r1; 445 case 521: 446 return NID_secp521r1; 447 default: 448 return -1; 449 } 450 } 451 452 const char * 453 sshkey_curve_nid_to_name(int nid) 454 { 455 switch (nid) { 456 case NID_X9_62_prime256v1: 457 return "nistp256"; 458 case NID_secp384r1: 459 return "nistp384"; 460 case NID_secp521r1: 461 return "nistp521"; 462 default: 463 return NULL; 464 } 465 } 466 467 int 468 sshkey_ec_nid_to_hash_alg(int nid) 469 { 470 int kbits = sshkey_curve_nid_to_bits(nid); 471 472 if (kbits <= 0) 473 return -1; 474 475 /* RFC5656 section 6.2.1 */ 476 if (kbits <= 256) 477 return SSH_DIGEST_SHA256; 478 else if (kbits <= 384) 479 return SSH_DIGEST_SHA384; 480 else 481 return SSH_DIGEST_SHA512; 482 } 483 #endif /* WITH_OPENSSL */ 484 485 static void 486 cert_free(struct sshkey_cert *cert) 487 { 488 u_int i; 489 490 if (cert == NULL) 491 return; 492 sshbuf_free(cert->certblob); 493 sshbuf_free(cert->critical); 494 sshbuf_free(cert->extensions); 495 free(cert->key_id); 496 for (i = 0; i < cert->nprincipals; i++) 497 free(cert->principals[i]); 498 free(cert->principals); 499 sshkey_free(cert->signature_key); 500 free(cert->signature_type); 501 freezero(cert, sizeof(*cert)); 502 } 503 504 static struct sshkey_cert * 505 cert_new(void) 506 { 507 struct sshkey_cert *cert; 508 509 if ((cert = calloc(1, sizeof(*cert))) == NULL) 510 return NULL; 511 if ((cert->certblob = sshbuf_new()) == NULL || 512 (cert->critical = sshbuf_new()) == NULL || 513 (cert->extensions = sshbuf_new()) == NULL) { 514 cert_free(cert); 515 return NULL; 516 } 517 cert->key_id = NULL; 518 cert->principals = NULL; 519 cert->signature_key = NULL; 520 cert->signature_type = NULL; 521 return cert; 522 } 523 524 struct sshkey * 525 sshkey_new(int type) 526 { 527 struct sshkey *k; 528 #ifdef WITH_OPENSSL 529 RSA *rsa; 530 DSA *dsa; 531 #endif /* WITH_OPENSSL */ 532 533 if ((k = calloc(1, sizeof(*k))) == NULL) 534 return NULL; 535 k->type = type; 536 k->ecdsa = NULL; 537 k->ecdsa_nid = -1; 538 k->dsa = NULL; 539 k->rsa = NULL; 540 k->cert = NULL; 541 k->ed25519_sk = NULL; 542 k->ed25519_pk = NULL; 543 k->xmss_sk = NULL; 544 k->xmss_pk = NULL; 545 switch (k->type) { 546 #ifdef WITH_OPENSSL 547 case KEY_RSA: 548 case KEY_RSA_CERT: 549 if ((rsa = RSA_new()) == NULL) { 550 free(k); 551 return NULL; 552 } 553 k->rsa = rsa; 554 break; 555 case KEY_DSA: 556 case KEY_DSA_CERT: 557 if ((dsa = DSA_new()) == NULL) { 558 free(k); 559 return NULL; 560 } 561 k->dsa = dsa; 562 break; 563 case KEY_ECDSA: 564 case KEY_ECDSA_CERT: 565 case KEY_ECDSA_SK: 566 case KEY_ECDSA_SK_CERT: 567 /* Cannot do anything until we know the group */ 568 break; 569 #endif /* WITH_OPENSSL */ 570 case KEY_ED25519: 571 case KEY_ED25519_CERT: 572 case KEY_ED25519_SK: 573 case KEY_ED25519_SK_CERT: 574 case KEY_XMSS: 575 case KEY_XMSS_CERT: 576 /* no need to prealloc */ 577 break; 578 case KEY_UNSPEC: 579 break; 580 default: 581 free(k); 582 return NULL; 583 } 584 585 if (sshkey_is_cert(k)) { 586 if ((k->cert = cert_new()) == NULL) { 587 sshkey_free(k); 588 return NULL; 589 } 590 } 591 592 return k; 593 } 594 595 void 596 sshkey_free(struct sshkey *k) 597 { 598 if (k == NULL) 599 return; 600 switch (k->type) { 601 #ifdef WITH_OPENSSL 602 case KEY_RSA: 603 case KEY_RSA_CERT: 604 RSA_free(k->rsa); 605 k->rsa = NULL; 606 break; 607 case KEY_DSA: 608 case KEY_DSA_CERT: 609 DSA_free(k->dsa); 610 k->dsa = NULL; 611 break; 612 case KEY_ECDSA_SK: 613 case KEY_ECDSA_SK_CERT: 614 free(k->sk_application); 615 sshbuf_free(k->sk_key_handle); 616 sshbuf_free(k->sk_reserved); 617 /* FALLTHROUGH */ 618 case KEY_ECDSA: 619 case KEY_ECDSA_CERT: 620 EC_KEY_free(k->ecdsa); 621 k->ecdsa = NULL; 622 break; 623 #endif /* WITH_OPENSSL */ 624 case KEY_ED25519_SK: 625 case KEY_ED25519_SK_CERT: 626 free(k->sk_application); 627 sshbuf_free(k->sk_key_handle); 628 sshbuf_free(k->sk_reserved); 629 /* FALLTHROUGH */ 630 case KEY_ED25519: 631 case KEY_ED25519_CERT: 632 freezero(k->ed25519_pk, ED25519_PK_SZ); 633 k->ed25519_pk = NULL; 634 freezero(k->ed25519_sk, ED25519_SK_SZ); 635 k->ed25519_sk = NULL; 636 break; 637 #ifdef WITH_XMSS 638 case KEY_XMSS: 639 case KEY_XMSS_CERT: 640 freezero(k->xmss_pk, sshkey_xmss_pklen(k)); 641 k->xmss_pk = NULL; 642 freezero(k->xmss_sk, sshkey_xmss_sklen(k)); 643 k->xmss_sk = NULL; 644 sshkey_xmss_free_state(k); 645 free(k->xmss_name); 646 k->xmss_name = NULL; 647 free(k->xmss_filename); 648 k->xmss_filename = NULL; 649 break; 650 #endif /* WITH_XMSS */ 651 case KEY_UNSPEC: 652 break; 653 default: 654 break; 655 } 656 if (sshkey_is_cert(k)) 657 cert_free(k->cert); 658 freezero(k->shielded_private, k->shielded_len); 659 freezero(k->shield_prekey, k->shield_prekey_len); 660 freezero(k, sizeof(*k)); 661 } 662 663 static int 664 cert_compare(struct sshkey_cert *a, struct sshkey_cert *b) 665 { 666 if (a == NULL && b == NULL) 667 return 1; 668 if (a == NULL || b == NULL) 669 return 0; 670 if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob)) 671 return 0; 672 if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob), 673 sshbuf_len(a->certblob)) != 0) 674 return 0; 675 return 1; 676 } 677 678 /* 679 * Compare public portions of key only, allowing comparisons between 680 * certificates and plain keys too. 681 */ 682 int 683 sshkey_equal_public(const struct sshkey *a, const struct sshkey *b) 684 { 685 #ifdef WITH_OPENSSL 686 const BIGNUM *rsa_e_a, *rsa_n_a; 687 const BIGNUM *rsa_e_b, *rsa_n_b; 688 const BIGNUM *dsa_p_a, *dsa_q_a, *dsa_g_a, *dsa_pub_key_a; 689 const BIGNUM *dsa_p_b, *dsa_q_b, *dsa_g_b, *dsa_pub_key_b; 690 #endif /* WITH_OPENSSL */ 691 692 if (a == NULL || b == NULL || 693 sshkey_type_plain(a->type) != sshkey_type_plain(b->type)) 694 return 0; 695 696 switch (a->type) { 697 #ifdef WITH_OPENSSL 698 case KEY_RSA_CERT: 699 case KEY_RSA: 700 if (a->rsa == NULL || b->rsa == NULL) 701 return 0; 702 RSA_get0_key(a->rsa, &rsa_n_a, &rsa_e_a, NULL); 703 RSA_get0_key(b->rsa, &rsa_n_b, &rsa_e_b, NULL); 704 return BN_cmp(rsa_e_a, rsa_e_b) == 0 && 705 BN_cmp(rsa_n_a, rsa_n_b) == 0; 706 case KEY_DSA_CERT: 707 case KEY_DSA: 708 if (a->dsa == NULL || b->dsa == NULL) 709 return 0; 710 DSA_get0_pqg(a->dsa, &dsa_p_a, &dsa_q_a, &dsa_g_a); 711 DSA_get0_pqg(b->dsa, &dsa_p_b, &dsa_q_b, &dsa_g_b); 712 DSA_get0_key(a->dsa, &dsa_pub_key_a, NULL); 713 DSA_get0_key(b->dsa, &dsa_pub_key_b, NULL); 714 return BN_cmp(dsa_p_a, dsa_p_b) == 0 && 715 BN_cmp(dsa_q_a, dsa_q_b) == 0 && 716 BN_cmp(dsa_g_a, dsa_g_b) == 0 && 717 BN_cmp(dsa_pub_key_a, dsa_pub_key_b) == 0; 718 case KEY_ECDSA_SK: 719 case KEY_ECDSA_SK_CERT: 720 if (a->sk_application == NULL || b->sk_application == NULL) 721 return 0; 722 if (strcmp(a->sk_application, b->sk_application) != 0) 723 return 0; 724 /* FALLTHROUGH */ 725 case KEY_ECDSA_CERT: 726 case KEY_ECDSA: 727 if (a->ecdsa == NULL || b->ecdsa == NULL || 728 EC_KEY_get0_public_key(a->ecdsa) == NULL || 729 EC_KEY_get0_public_key(b->ecdsa) == NULL) 730 return 0; 731 if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa), 732 EC_KEY_get0_group(b->ecdsa), NULL) != 0 || 733 EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa), 734 EC_KEY_get0_public_key(a->ecdsa), 735 EC_KEY_get0_public_key(b->ecdsa), NULL) != 0) 736 return 0; 737 return 1; 738 #endif /* WITH_OPENSSL */ 739 case KEY_ED25519_SK: 740 case KEY_ED25519_SK_CERT: 741 if (a->sk_application == NULL || b->sk_application == NULL) 742 return 0; 743 if (strcmp(a->sk_application, b->sk_application) != 0) 744 return 0; 745 /* FALLTHROUGH */ 746 case KEY_ED25519: 747 case KEY_ED25519_CERT: 748 return a->ed25519_pk != NULL && b->ed25519_pk != NULL && 749 memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0; 750 #ifdef WITH_XMSS 751 case KEY_XMSS: 752 case KEY_XMSS_CERT: 753 return a->xmss_pk != NULL && b->xmss_pk != NULL && 754 sshkey_xmss_pklen(a) == sshkey_xmss_pklen(b) && 755 memcmp(a->xmss_pk, b->xmss_pk, sshkey_xmss_pklen(a)) == 0; 756 #endif /* WITH_XMSS */ 757 default: 758 return 0; 759 } 760 /* NOTREACHED */ 761 } 762 763 int 764 sshkey_equal(const struct sshkey *a, const struct sshkey *b) 765 { 766 if (a == NULL || b == NULL || a->type != b->type) 767 return 0; 768 if (sshkey_is_cert(a)) { 769 if (!cert_compare(a->cert, b->cert)) 770 return 0; 771 } 772 return sshkey_equal_public(a, b); 773 } 774 775 static int 776 to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain, 777 enum sshkey_serialize_rep opts) 778 { 779 int type, ret = SSH_ERR_INTERNAL_ERROR; 780 const char *typename; 781 #ifdef WITH_OPENSSL 782 const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key; 783 #endif /* WITH_OPENSSL */ 784 785 if (key == NULL) 786 return SSH_ERR_INVALID_ARGUMENT; 787 788 if (sshkey_is_cert(key)) { 789 if (key->cert == NULL) 790 return SSH_ERR_EXPECTED_CERT; 791 if (sshbuf_len(key->cert->certblob) == 0) 792 return SSH_ERR_KEY_LACKS_CERTBLOB; 793 } 794 type = force_plain ? sshkey_type_plain(key->type) : key->type; 795 typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid); 796 797 switch (type) { 798 #ifdef WITH_OPENSSL 799 case KEY_DSA_CERT: 800 case KEY_ECDSA_CERT: 801 case KEY_ECDSA_SK_CERT: 802 case KEY_RSA_CERT: 803 #endif /* WITH_OPENSSL */ 804 case KEY_ED25519_CERT: 805 case KEY_ED25519_SK_CERT: 806 #ifdef WITH_XMSS 807 case KEY_XMSS_CERT: 808 #endif /* WITH_XMSS */ 809 /* Use the existing blob */ 810 /* XXX modified flag? */ 811 if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0) 812 return ret; 813 break; 814 #ifdef WITH_OPENSSL 815 case KEY_DSA: 816 if (key->dsa == NULL) 817 return SSH_ERR_INVALID_ARGUMENT; 818 DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g); 819 DSA_get0_key(key->dsa, &dsa_pub_key, NULL); 820 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 821 (ret = sshbuf_put_bignum2(b, dsa_p)) != 0 || 822 (ret = sshbuf_put_bignum2(b, dsa_q)) != 0 || 823 (ret = sshbuf_put_bignum2(b, dsa_g)) != 0 || 824 (ret = sshbuf_put_bignum2(b, dsa_pub_key)) != 0) 825 return ret; 826 break; 827 case KEY_ECDSA: 828 case KEY_ECDSA_SK: 829 if (key->ecdsa == NULL) 830 return SSH_ERR_INVALID_ARGUMENT; 831 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 832 (ret = sshbuf_put_cstring(b, 833 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || 834 (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0) 835 return ret; 836 if (type == KEY_ECDSA_SK) { 837 if ((ret = sshbuf_put_cstring(b, 838 key->sk_application)) != 0) 839 return ret; 840 } 841 break; 842 case KEY_RSA: 843 if (key->rsa == NULL) 844 return SSH_ERR_INVALID_ARGUMENT; 845 RSA_get0_key(key->rsa, &rsa_n, &rsa_e, NULL); 846 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 847 (ret = sshbuf_put_bignum2(b, rsa_e)) != 0 || 848 (ret = sshbuf_put_bignum2(b, rsa_n)) != 0) 849 return ret; 850 break; 851 #endif /* WITH_OPENSSL */ 852 case KEY_ED25519: 853 case KEY_ED25519_SK: 854 if (key->ed25519_pk == NULL) 855 return SSH_ERR_INVALID_ARGUMENT; 856 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 857 (ret = sshbuf_put_string(b, 858 key->ed25519_pk, ED25519_PK_SZ)) != 0) 859 return ret; 860 if (type == KEY_ED25519_SK) { 861 if ((ret = sshbuf_put_cstring(b, 862 key->sk_application)) != 0) 863 return ret; 864 } 865 break; 866 #ifdef WITH_XMSS 867 case KEY_XMSS: 868 if (key->xmss_name == NULL || key->xmss_pk == NULL || 869 sshkey_xmss_pklen(key) == 0) 870 return SSH_ERR_INVALID_ARGUMENT; 871 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 872 (ret = sshbuf_put_cstring(b, key->xmss_name)) != 0 || 873 (ret = sshbuf_put_string(b, 874 key->xmss_pk, sshkey_xmss_pklen(key))) != 0 || 875 (ret = sshkey_xmss_serialize_pk_info(key, b, opts)) != 0) 876 return ret; 877 break; 878 #endif /* WITH_XMSS */ 879 default: 880 return SSH_ERR_KEY_TYPE_UNKNOWN; 881 } 882 return 0; 883 } 884 885 int 886 sshkey_putb(const struct sshkey *key, struct sshbuf *b) 887 { 888 return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT); 889 } 890 891 int 892 sshkey_puts_opts(const struct sshkey *key, struct sshbuf *b, 893 enum sshkey_serialize_rep opts) 894 { 895 struct sshbuf *tmp; 896 int r; 897 898 if ((tmp = sshbuf_new()) == NULL) 899 return SSH_ERR_ALLOC_FAIL; 900 r = to_blob_buf(key, tmp, 0, opts); 901 if (r == 0) 902 r = sshbuf_put_stringb(b, tmp); 903 sshbuf_free(tmp); 904 return r; 905 } 906 907 int 908 sshkey_puts(const struct sshkey *key, struct sshbuf *b) 909 { 910 return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT); 911 } 912 913 int 914 sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b) 915 { 916 return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT); 917 } 918 919 static int 920 to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain, 921 enum sshkey_serialize_rep opts) 922 { 923 int ret = SSH_ERR_INTERNAL_ERROR; 924 size_t len; 925 struct sshbuf *b = NULL; 926 927 if (lenp != NULL) 928 *lenp = 0; 929 if (blobp != NULL) 930 *blobp = NULL; 931 if ((b = sshbuf_new()) == NULL) 932 return SSH_ERR_ALLOC_FAIL; 933 if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0) 934 goto out; 935 len = sshbuf_len(b); 936 if (lenp != NULL) 937 *lenp = len; 938 if (blobp != NULL) { 939 if ((*blobp = malloc(len)) == NULL) { 940 ret = SSH_ERR_ALLOC_FAIL; 941 goto out; 942 } 943 memcpy(*blobp, sshbuf_ptr(b), len); 944 } 945 ret = 0; 946 out: 947 sshbuf_free(b); 948 return ret; 949 } 950 951 int 952 sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp) 953 { 954 return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT); 955 } 956 957 int 958 sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp) 959 { 960 return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT); 961 } 962 963 int 964 sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg, 965 u_char **retp, size_t *lenp) 966 { 967 u_char *blob = NULL, *ret = NULL; 968 size_t blob_len = 0; 969 int r = SSH_ERR_INTERNAL_ERROR; 970 971 if (retp != NULL) 972 *retp = NULL; 973 if (lenp != NULL) 974 *lenp = 0; 975 if (ssh_digest_bytes(dgst_alg) == 0) { 976 r = SSH_ERR_INVALID_ARGUMENT; 977 goto out; 978 } 979 if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT)) 980 != 0) 981 goto out; 982 if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) { 983 r = SSH_ERR_ALLOC_FAIL; 984 goto out; 985 } 986 if ((r = ssh_digest_memory(dgst_alg, blob, blob_len, 987 ret, SSH_DIGEST_MAX_LENGTH)) != 0) 988 goto out; 989 /* success */ 990 if (retp != NULL) { 991 *retp = ret; 992 ret = NULL; 993 } 994 if (lenp != NULL) 995 *lenp = ssh_digest_bytes(dgst_alg); 996 r = 0; 997 out: 998 free(ret); 999 if (blob != NULL) 1000 freezero(blob, blob_len); 1001 return r; 1002 } 1003 1004 static char * 1005 fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len) 1006 { 1007 char *ret; 1008 size_t plen = strlen(alg) + 1; 1009 size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1; 1010 1011 if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL) 1012 return NULL; 1013 strlcpy(ret, alg, rlen); 1014 strlcat(ret, ":", rlen); 1015 if (dgst_raw_len == 0) 1016 return ret; 1017 if (b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) { 1018 freezero(ret, rlen); 1019 return NULL; 1020 } 1021 /* Trim padding characters from end */ 1022 ret[strcspn(ret, "=")] = '\0'; 1023 return ret; 1024 } 1025 1026 static char * 1027 fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len) 1028 { 1029 char *retval, hex[5]; 1030 size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2; 1031 1032 if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL) 1033 return NULL; 1034 strlcpy(retval, alg, rlen); 1035 strlcat(retval, ":", rlen); 1036 for (i = 0; i < dgst_raw_len; i++) { 1037 snprintf(hex, sizeof(hex), "%s%02x", 1038 i > 0 ? ":" : "", dgst_raw[i]); 1039 strlcat(retval, hex, rlen); 1040 } 1041 return retval; 1042 } 1043 1044 static char * 1045 fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len) 1046 { 1047 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; 1048 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', 1049 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; 1050 u_int i, j = 0, rounds, seed = 1; 1051 char *retval; 1052 1053 rounds = (dgst_raw_len / 2) + 1; 1054 if ((retval = calloc(rounds, 6)) == NULL) 1055 return NULL; 1056 retval[j++] = 'x'; 1057 for (i = 0; i < rounds; i++) { 1058 u_int idx0, idx1, idx2, idx3, idx4; 1059 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { 1060 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + 1061 seed) % 6; 1062 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; 1063 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + 1064 (seed / 6)) % 6; 1065 retval[j++] = vowels[idx0]; 1066 retval[j++] = consonants[idx1]; 1067 retval[j++] = vowels[idx2]; 1068 if ((i + 1) < rounds) { 1069 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; 1070 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; 1071 retval[j++] = consonants[idx3]; 1072 retval[j++] = '-'; 1073 retval[j++] = consonants[idx4]; 1074 seed = ((seed * 5) + 1075 ((((u_int)(dgst_raw[2 * i])) * 7) + 1076 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; 1077 } 1078 } else { 1079 idx0 = seed % 6; 1080 idx1 = 16; 1081 idx2 = seed / 6; 1082 retval[j++] = vowels[idx0]; 1083 retval[j++] = consonants[idx1]; 1084 retval[j++] = vowels[idx2]; 1085 } 1086 } 1087 retval[j++] = 'x'; 1088 retval[j++] = '\0'; 1089 return retval; 1090 } 1091 1092 /* 1093 * Draw an ASCII-Art representing the fingerprint so human brain can 1094 * profit from its built-in pattern recognition ability. 1095 * This technique is called "random art" and can be found in some 1096 * scientific publications like this original paper: 1097 * 1098 * "Hash Visualization: a New Technique to improve Real-World Security", 1099 * Perrig A. and Song D., 1999, International Workshop on Cryptographic 1100 * Techniques and E-Commerce (CrypTEC '99) 1101 * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf 1102 * 1103 * The subject came up in a talk by Dan Kaminsky, too. 1104 * 1105 * If you see the picture is different, the key is different. 1106 * If the picture looks the same, you still know nothing. 1107 * 1108 * The algorithm used here is a worm crawling over a discrete plane, 1109 * leaving a trace (augmenting the field) everywhere it goes. 1110 * Movement is taken from dgst_raw 2bit-wise. Bumping into walls 1111 * makes the respective movement vector be ignored for this turn. 1112 * Graphs are not unambiguous, because circles in graphs can be 1113 * walked in either direction. 1114 */ 1115 1116 /* 1117 * Field sizes for the random art. Have to be odd, so the starting point 1118 * can be in the exact middle of the picture, and FLDBASE should be >=8 . 1119 * Else pictures would be too dense, and drawing the frame would 1120 * fail, too, because the key type would not fit in anymore. 1121 */ 1122 #define FLDBASE 8 1123 #define FLDSIZE_Y (FLDBASE + 1) 1124 #define FLDSIZE_X (FLDBASE * 2 + 1) 1125 static char * 1126 fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len, 1127 const struct sshkey *k) 1128 { 1129 /* 1130 * Chars to be used after each other every time the worm 1131 * intersects with itself. Matter of taste. 1132 */ 1133 const char *augmentation_string = " .o+=*BOX@%&#/^SE"; 1134 char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X]; 1135 u_char field[FLDSIZE_X][FLDSIZE_Y]; 1136 size_t i, tlen, hlen; 1137 u_int b; 1138 int x, y, r; 1139 size_t len = strlen(augmentation_string) - 1; 1140 1141 if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL) 1142 return NULL; 1143 1144 /* initialize field */ 1145 memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char)); 1146 x = FLDSIZE_X / 2; 1147 y = FLDSIZE_Y / 2; 1148 1149 /* process raw key */ 1150 for (i = 0; i < dgst_raw_len; i++) { 1151 int input; 1152 /* each byte conveys four 2-bit move commands */ 1153 input = dgst_raw[i]; 1154 for (b = 0; b < 4; b++) { 1155 /* evaluate 2 bit, rest is shifted later */ 1156 x += (input & 0x1) ? 1 : -1; 1157 y += (input & 0x2) ? 1 : -1; 1158 1159 /* assure we are still in bounds */ 1160 x = MAXIMUM(x, 0); 1161 y = MAXIMUM(y, 0); 1162 x = MINIMUM(x, FLDSIZE_X - 1); 1163 y = MINIMUM(y, FLDSIZE_Y - 1); 1164 1165 /* augment the field */ 1166 if (field[x][y] < len - 2) 1167 field[x][y]++; 1168 input = input >> 2; 1169 } 1170 } 1171 1172 /* mark starting point and end point*/ 1173 field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1; 1174 field[x][y] = len; 1175 1176 /* assemble title */ 1177 r = snprintf(title, sizeof(title), "[%s %u]", 1178 sshkey_type(k), sshkey_size(k)); 1179 /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */ 1180 if (r < 0 || r > (int)sizeof(title)) 1181 r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k)); 1182 tlen = (r <= 0) ? 0 : strlen(title); 1183 1184 /* assemble hash ID. */ 1185 r = snprintf(hash, sizeof(hash), "[%s]", alg); 1186 hlen = (r <= 0) ? 0 : strlen(hash); 1187 1188 /* output upper border */ 1189 p = retval; 1190 *p++ = '+'; 1191 for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++) 1192 *p++ = '-'; 1193 memcpy(p, title, tlen); 1194 p += tlen; 1195 for (i += tlen; i < FLDSIZE_X; i++) 1196 *p++ = '-'; 1197 *p++ = '+'; 1198 *p++ = '\n'; 1199 1200 /* output content */ 1201 for (y = 0; y < FLDSIZE_Y; y++) { 1202 *p++ = '|'; 1203 for (x = 0; x < FLDSIZE_X; x++) 1204 *p++ = augmentation_string[MINIMUM(field[x][y], len)]; 1205 *p++ = '|'; 1206 *p++ = '\n'; 1207 } 1208 1209 /* output lower border */ 1210 *p++ = '+'; 1211 for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++) 1212 *p++ = '-'; 1213 memcpy(p, hash, hlen); 1214 p += hlen; 1215 for (i += hlen; i < FLDSIZE_X; i++) 1216 *p++ = '-'; 1217 *p++ = '+'; 1218 1219 return retval; 1220 } 1221 1222 char * 1223 sshkey_fingerprint(const struct sshkey *k, int dgst_alg, 1224 enum sshkey_fp_rep dgst_rep) 1225 { 1226 char *retval = NULL; 1227 u_char *dgst_raw; 1228 size_t dgst_raw_len; 1229 1230 if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0) 1231 return NULL; 1232 switch (dgst_rep) { 1233 case SSH_FP_DEFAULT: 1234 if (dgst_alg == SSH_DIGEST_MD5) { 1235 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg), 1236 dgst_raw, dgst_raw_len); 1237 } else { 1238 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg), 1239 dgst_raw, dgst_raw_len); 1240 } 1241 break; 1242 case SSH_FP_HEX: 1243 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg), 1244 dgst_raw, dgst_raw_len); 1245 break; 1246 case SSH_FP_BASE64: 1247 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg), 1248 dgst_raw, dgst_raw_len); 1249 break; 1250 case SSH_FP_BUBBLEBABBLE: 1251 retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len); 1252 break; 1253 case SSH_FP_RANDOMART: 1254 retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg), 1255 dgst_raw, dgst_raw_len, k); 1256 break; 1257 default: 1258 freezero(dgst_raw, dgst_raw_len); 1259 return NULL; 1260 } 1261 freezero(dgst_raw, dgst_raw_len); 1262 return retval; 1263 } 1264 1265 static int 1266 peek_type_nid(const char *s, size_t l, int *nid) 1267 { 1268 const struct keytype *kt; 1269 1270 for (kt = keytypes; kt->type != -1; kt++) { 1271 if (kt->name == NULL || strlen(kt->name) != l) 1272 continue; 1273 if (memcmp(s, kt->name, l) == 0) { 1274 *nid = -1; 1275 if (key_type_is_ecdsa_variant(kt->type)) 1276 *nid = kt->nid; 1277 return kt->type; 1278 } 1279 } 1280 return KEY_UNSPEC; 1281 } 1282 1283 /* XXX this can now be made const char * */ 1284 int 1285 sshkey_read(struct sshkey *ret, char **cpp) 1286 { 1287 struct sshkey *k; 1288 char *cp, *blobcopy; 1289 size_t space; 1290 int r, type, curve_nid = -1; 1291 struct sshbuf *blob; 1292 1293 if (ret == NULL) 1294 return SSH_ERR_INVALID_ARGUMENT; 1295 1296 switch (ret->type) { 1297 case KEY_UNSPEC: 1298 case KEY_RSA: 1299 case KEY_DSA: 1300 case KEY_ECDSA: 1301 case KEY_ECDSA_SK: 1302 case KEY_ED25519: 1303 case KEY_ED25519_SK: 1304 case KEY_DSA_CERT: 1305 case KEY_ECDSA_CERT: 1306 case KEY_ECDSA_SK_CERT: 1307 case KEY_RSA_CERT: 1308 case KEY_ED25519_CERT: 1309 case KEY_ED25519_SK_CERT: 1310 #ifdef WITH_XMSS 1311 case KEY_XMSS: 1312 case KEY_XMSS_CERT: 1313 #endif /* WITH_XMSS */ 1314 break; /* ok */ 1315 default: 1316 return SSH_ERR_INVALID_ARGUMENT; 1317 } 1318 1319 /* Decode type */ 1320 cp = *cpp; 1321 space = strcspn(cp, " \t"); 1322 if (space == strlen(cp)) 1323 return SSH_ERR_INVALID_FORMAT; 1324 if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC) 1325 return SSH_ERR_INVALID_FORMAT; 1326 1327 /* skip whitespace */ 1328 for (cp += space; *cp == ' ' || *cp == '\t'; cp++) 1329 ; 1330 if (*cp == '\0') 1331 return SSH_ERR_INVALID_FORMAT; 1332 if (ret->type != KEY_UNSPEC && ret->type != type) 1333 return SSH_ERR_KEY_TYPE_MISMATCH; 1334 if ((blob = sshbuf_new()) == NULL) 1335 return SSH_ERR_ALLOC_FAIL; 1336 1337 /* find end of keyblob and decode */ 1338 space = strcspn(cp, " \t"); 1339 if ((blobcopy = strndup(cp, space)) == NULL) { 1340 sshbuf_free(blob); 1341 return SSH_ERR_ALLOC_FAIL; 1342 } 1343 if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) { 1344 free(blobcopy); 1345 sshbuf_free(blob); 1346 return r; 1347 } 1348 free(blobcopy); 1349 if ((r = sshkey_fromb(blob, &k)) != 0) { 1350 sshbuf_free(blob); 1351 return r; 1352 } 1353 sshbuf_free(blob); 1354 1355 /* skip whitespace and leave cp at start of comment */ 1356 for (cp += space; *cp == ' ' || *cp == '\t'; cp++) 1357 ; 1358 1359 /* ensure type of blob matches type at start of line */ 1360 if (k->type != type) { 1361 sshkey_free(k); 1362 return SSH_ERR_KEY_TYPE_MISMATCH; 1363 } 1364 if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) { 1365 sshkey_free(k); 1366 return SSH_ERR_EC_CURVE_MISMATCH; 1367 } 1368 1369 /* Fill in ret from parsed key */ 1370 ret->type = type; 1371 if (sshkey_is_cert(ret)) { 1372 if (!sshkey_is_cert(k)) { 1373 sshkey_free(k); 1374 return SSH_ERR_EXPECTED_CERT; 1375 } 1376 if (ret->cert != NULL) 1377 cert_free(ret->cert); 1378 ret->cert = k->cert; 1379 k->cert = NULL; 1380 } 1381 switch (sshkey_type_plain(ret->type)) { 1382 #ifdef WITH_OPENSSL 1383 case KEY_RSA: 1384 RSA_free(ret->rsa); 1385 ret->rsa = k->rsa; 1386 k->rsa = NULL; 1387 #ifdef DEBUG_PK 1388 RSA_print_fp(stderr, ret->rsa, 8); 1389 #endif 1390 break; 1391 case KEY_DSA: 1392 DSA_free(ret->dsa); 1393 ret->dsa = k->dsa; 1394 k->dsa = NULL; 1395 #ifdef DEBUG_PK 1396 DSA_print_fp(stderr, ret->dsa, 8); 1397 #endif 1398 break; 1399 case KEY_ECDSA: 1400 EC_KEY_free(ret->ecdsa); 1401 ret->ecdsa = k->ecdsa; 1402 ret->ecdsa_nid = k->ecdsa_nid; 1403 k->ecdsa = NULL; 1404 k->ecdsa_nid = -1; 1405 #ifdef DEBUG_PK 1406 sshkey_dump_ec_key(ret->ecdsa); 1407 #endif 1408 break; 1409 case KEY_ECDSA_SK: 1410 EC_KEY_free(ret->ecdsa); 1411 ret->ecdsa = k->ecdsa; 1412 ret->ecdsa_nid = k->ecdsa_nid; 1413 ret->sk_application = k->sk_application; 1414 k->ecdsa = NULL; 1415 k->ecdsa_nid = -1; 1416 k->sk_application = NULL; 1417 #ifdef DEBUG_PK 1418 sshkey_dump_ec_key(ret->ecdsa); 1419 fprintf(stderr, "App: %s\n", ret->sk_application); 1420 #endif 1421 break; 1422 #endif /* WITH_OPENSSL */ 1423 case KEY_ED25519: 1424 freezero(ret->ed25519_pk, ED25519_PK_SZ); 1425 ret->ed25519_pk = k->ed25519_pk; 1426 k->ed25519_pk = NULL; 1427 #ifdef DEBUG_PK 1428 /* XXX */ 1429 #endif 1430 break; 1431 case KEY_ED25519_SK: 1432 freezero(ret->ed25519_pk, ED25519_PK_SZ); 1433 ret->ed25519_pk = k->ed25519_pk; 1434 ret->sk_application = k->sk_application; 1435 k->ed25519_pk = NULL; 1436 k->sk_application = NULL; 1437 break; 1438 #ifdef WITH_XMSS 1439 case KEY_XMSS: 1440 free(ret->xmss_pk); 1441 ret->xmss_pk = k->xmss_pk; 1442 k->xmss_pk = NULL; 1443 free(ret->xmss_state); 1444 ret->xmss_state = k->xmss_state; 1445 k->xmss_state = NULL; 1446 free(ret->xmss_name); 1447 ret->xmss_name = k->xmss_name; 1448 k->xmss_name = NULL; 1449 free(ret->xmss_filename); 1450 ret->xmss_filename = k->xmss_filename; 1451 k->xmss_filename = NULL; 1452 #ifdef DEBUG_PK 1453 /* XXX */ 1454 #endif 1455 break; 1456 #endif /* WITH_XMSS */ 1457 default: 1458 sshkey_free(k); 1459 return SSH_ERR_INTERNAL_ERROR; 1460 } 1461 sshkey_free(k); 1462 1463 /* success */ 1464 *cpp = cp; 1465 return 0; 1466 } 1467 1468 int 1469 sshkey_to_base64(const struct sshkey *key, char **b64p) 1470 { 1471 int r = SSH_ERR_INTERNAL_ERROR; 1472 struct sshbuf *b = NULL; 1473 char *uu = NULL; 1474 1475 if (b64p != NULL) 1476 *b64p = NULL; 1477 if ((b = sshbuf_new()) == NULL) 1478 return SSH_ERR_ALLOC_FAIL; 1479 if ((r = sshkey_putb(key, b)) != 0) 1480 goto out; 1481 if ((uu = sshbuf_dtob64_string(b, 0)) == NULL) { 1482 r = SSH_ERR_ALLOC_FAIL; 1483 goto out; 1484 } 1485 /* Success */ 1486 if (b64p != NULL) { 1487 *b64p = uu; 1488 uu = NULL; 1489 } 1490 r = 0; 1491 out: 1492 sshbuf_free(b); 1493 free(uu); 1494 return r; 1495 } 1496 1497 int 1498 sshkey_format_text(const struct sshkey *key, struct sshbuf *b) 1499 { 1500 int r = SSH_ERR_INTERNAL_ERROR; 1501 char *uu = NULL; 1502 1503 if ((r = sshkey_to_base64(key, &uu)) != 0) 1504 goto out; 1505 if ((r = sshbuf_putf(b, "%s %s", 1506 sshkey_ssh_name(key), uu)) != 0) 1507 goto out; 1508 r = 0; 1509 out: 1510 free(uu); 1511 return r; 1512 } 1513 1514 int 1515 sshkey_write(const struct sshkey *key, FILE *f) 1516 { 1517 struct sshbuf *b = NULL; 1518 int r = SSH_ERR_INTERNAL_ERROR; 1519 1520 if ((b = sshbuf_new()) == NULL) 1521 return SSH_ERR_ALLOC_FAIL; 1522 if ((r = sshkey_format_text(key, b)) != 0) 1523 goto out; 1524 if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) { 1525 if (feof(f)) 1526 errno = EPIPE; 1527 r = SSH_ERR_SYSTEM_ERROR; 1528 goto out; 1529 } 1530 /* Success */ 1531 r = 0; 1532 out: 1533 sshbuf_free(b); 1534 return r; 1535 } 1536 1537 const char * 1538 sshkey_cert_type(const struct sshkey *k) 1539 { 1540 switch (k->cert->type) { 1541 case SSH2_CERT_TYPE_USER: 1542 return "user"; 1543 case SSH2_CERT_TYPE_HOST: 1544 return "host"; 1545 default: 1546 return "unknown"; 1547 } 1548 } 1549 1550 #ifdef WITH_OPENSSL 1551 static int 1552 rsa_generate_private_key(u_int bits, RSA **rsap) 1553 { 1554 RSA *private = NULL; 1555 BIGNUM *f4 = NULL; 1556 int ret = SSH_ERR_INTERNAL_ERROR; 1557 1558 if (rsap == NULL) 1559 return SSH_ERR_INVALID_ARGUMENT; 1560 if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE || 1561 bits > SSHBUF_MAX_BIGNUM * 8) 1562 return SSH_ERR_KEY_LENGTH; 1563 *rsap = NULL; 1564 if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) { 1565 ret = SSH_ERR_ALLOC_FAIL; 1566 goto out; 1567 } 1568 if (!BN_set_word(f4, RSA_F4) || 1569 !RSA_generate_key_ex(private, bits, f4, NULL)) { 1570 ret = SSH_ERR_LIBCRYPTO_ERROR; 1571 goto out; 1572 } 1573 *rsap = private; 1574 private = NULL; 1575 ret = 0; 1576 out: 1577 RSA_free(private); 1578 BN_free(f4); 1579 return ret; 1580 } 1581 1582 static int 1583 dsa_generate_private_key(u_int bits, DSA **dsap) 1584 { 1585 DSA *private; 1586 int ret = SSH_ERR_INTERNAL_ERROR; 1587 1588 if (dsap == NULL) 1589 return SSH_ERR_INVALID_ARGUMENT; 1590 if (bits != 1024) 1591 return SSH_ERR_KEY_LENGTH; 1592 if ((private = DSA_new()) == NULL) { 1593 ret = SSH_ERR_ALLOC_FAIL; 1594 goto out; 1595 } 1596 *dsap = NULL; 1597 if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL, 1598 NULL, NULL) || !DSA_generate_key(private)) { 1599 ret = SSH_ERR_LIBCRYPTO_ERROR; 1600 goto out; 1601 } 1602 *dsap = private; 1603 private = NULL; 1604 ret = 0; 1605 out: 1606 DSA_free(private); 1607 return ret; 1608 } 1609 1610 int 1611 sshkey_ecdsa_key_to_nid(EC_KEY *k) 1612 { 1613 EC_GROUP *eg = NULL; /* XXXGCC: unneeded init */ 1614 int nids[] = { 1615 NID_X9_62_prime256v1, 1616 NID_secp384r1, 1617 NID_secp521r1, 1618 -1 1619 }; 1620 int nid; 1621 u_int i; 1622 const EC_GROUP *g = EC_KEY_get0_group(k); 1623 1624 /* 1625 * The group may be stored in a ASN.1 encoded private key in one of two 1626 * ways: as a "named group", which is reconstituted by ASN.1 object ID 1627 * or explicit group parameters encoded into the key blob. Only the 1628 * "named group" case sets the group NID for us, but we can figure 1629 * it out for the other case by comparing against all the groups that 1630 * are supported. 1631 */ 1632 if ((nid = EC_GROUP_get_curve_name(g)) > 0) 1633 return nid; 1634 for (i = 0; nids[i] != -1; i++) { 1635 if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) 1636 return -1; 1637 if (EC_GROUP_cmp(g, eg, NULL) == 0) 1638 break; 1639 EC_GROUP_free(eg); 1640 } 1641 if (nids[i] != -1) { 1642 /* Use the group with the NID attached */ 1643 EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE); 1644 if (EC_KEY_set_group(k, eg) != 1) { 1645 EC_GROUP_free(eg); 1646 return -1; 1647 } 1648 } 1649 return nids[i]; 1650 } 1651 1652 static int 1653 ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap) 1654 { 1655 EC_KEY *private; 1656 int ret = SSH_ERR_INTERNAL_ERROR; 1657 1658 if (nid == NULL || ecdsap == NULL) 1659 return SSH_ERR_INVALID_ARGUMENT; 1660 if ((*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1) 1661 return SSH_ERR_KEY_LENGTH; 1662 *ecdsap = NULL; 1663 if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) { 1664 ret = SSH_ERR_ALLOC_FAIL; 1665 goto out; 1666 } 1667 if (EC_KEY_generate_key(private) != 1) { 1668 ret = SSH_ERR_LIBCRYPTO_ERROR; 1669 goto out; 1670 } 1671 EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE); 1672 *ecdsap = private; 1673 private = NULL; 1674 ret = 0; 1675 out: 1676 EC_KEY_free(private); 1677 return ret; 1678 } 1679 #endif /* WITH_OPENSSL */ 1680 1681 int 1682 sshkey_generate(int type, u_int bits, struct sshkey **keyp) 1683 { 1684 struct sshkey *k; 1685 int ret = SSH_ERR_INTERNAL_ERROR; 1686 1687 if (keyp == NULL) 1688 return SSH_ERR_INVALID_ARGUMENT; 1689 *keyp = NULL; 1690 if ((k = sshkey_new(KEY_UNSPEC)) == NULL) 1691 return SSH_ERR_ALLOC_FAIL; 1692 switch (type) { 1693 case KEY_ED25519: 1694 if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL || 1695 (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) { 1696 ret = SSH_ERR_ALLOC_FAIL; 1697 break; 1698 } 1699 crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk); 1700 ret = 0; 1701 break; 1702 #ifdef WITH_XMSS 1703 case KEY_XMSS: 1704 ret = sshkey_xmss_generate_private_key(k, bits); 1705 break; 1706 #endif /* WITH_XMSS */ 1707 #ifdef WITH_OPENSSL 1708 case KEY_DSA: 1709 ret = dsa_generate_private_key(bits, &k->dsa); 1710 break; 1711 case KEY_ECDSA: 1712 ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid, 1713 &k->ecdsa); 1714 break; 1715 case KEY_RSA: 1716 ret = rsa_generate_private_key(bits, &k->rsa); 1717 break; 1718 #endif /* WITH_OPENSSL */ 1719 default: 1720 ret = SSH_ERR_INVALID_ARGUMENT; 1721 } 1722 if (ret == 0) { 1723 k->type = type; 1724 *keyp = k; 1725 } else 1726 sshkey_free(k); 1727 return ret; 1728 } 1729 1730 int 1731 sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key) 1732 { 1733 u_int i; 1734 const struct sshkey_cert *from; 1735 struct sshkey_cert *to; 1736 int r = SSH_ERR_INTERNAL_ERROR; 1737 1738 if (to_key == NULL || (from = from_key->cert) == NULL) 1739 return SSH_ERR_INVALID_ARGUMENT; 1740 1741 if ((to = cert_new()) == NULL) 1742 return SSH_ERR_ALLOC_FAIL; 1743 1744 if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 || 1745 (r = sshbuf_putb(to->critical, from->critical)) != 0 || 1746 (r = sshbuf_putb(to->extensions, from->extensions)) != 0) 1747 goto out; 1748 1749 to->serial = from->serial; 1750 to->type = from->type; 1751 if (from->key_id == NULL) 1752 to->key_id = NULL; 1753 else if ((to->key_id = strdup(from->key_id)) == NULL) { 1754 r = SSH_ERR_ALLOC_FAIL; 1755 goto out; 1756 } 1757 to->valid_after = from->valid_after; 1758 to->valid_before = from->valid_before; 1759 if (from->signature_key == NULL) 1760 to->signature_key = NULL; 1761 else if ((r = sshkey_from_private(from->signature_key, 1762 &to->signature_key)) != 0) 1763 goto out; 1764 if (from->signature_type != NULL && 1765 (to->signature_type = strdup(from->signature_type)) == NULL) { 1766 r = SSH_ERR_ALLOC_FAIL; 1767 goto out; 1768 } 1769 if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) { 1770 r = SSH_ERR_INVALID_ARGUMENT; 1771 goto out; 1772 } 1773 if (from->nprincipals > 0) { 1774 if ((to->principals = calloc(from->nprincipals, 1775 sizeof(*to->principals))) == NULL) { 1776 r = SSH_ERR_ALLOC_FAIL; 1777 goto out; 1778 } 1779 for (i = 0; i < from->nprincipals; i++) { 1780 to->principals[i] = strdup(from->principals[i]); 1781 if (to->principals[i] == NULL) { 1782 to->nprincipals = i; 1783 r = SSH_ERR_ALLOC_FAIL; 1784 goto out; 1785 } 1786 } 1787 } 1788 to->nprincipals = from->nprincipals; 1789 1790 /* success */ 1791 cert_free(to_key->cert); 1792 to_key->cert = to; 1793 to = NULL; 1794 r = 0; 1795 out: 1796 cert_free(to); 1797 return r; 1798 } 1799 1800 int 1801 sshkey_from_private(const struct sshkey *k, struct sshkey **pkp) 1802 { 1803 struct sshkey *n = NULL; 1804 int r = SSH_ERR_INTERNAL_ERROR; 1805 #ifdef WITH_OPENSSL 1806 const BIGNUM *rsa_n, *rsa_e; 1807 BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL; 1808 const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key; 1809 BIGNUM *dsa_p_dup = NULL, *dsa_q_dup = NULL, *dsa_g_dup = NULL; 1810 BIGNUM *dsa_pub_key_dup = NULL; 1811 #endif /* WITH_OPENSSL */ 1812 1813 *pkp = NULL; 1814 if ((n = sshkey_new(k->type)) == NULL) { 1815 r = SSH_ERR_ALLOC_FAIL; 1816 goto out; 1817 } 1818 switch (k->type) { 1819 #ifdef WITH_OPENSSL 1820 case KEY_DSA: 1821 case KEY_DSA_CERT: 1822 DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g); 1823 DSA_get0_key(k->dsa, &dsa_pub_key, NULL); 1824 if ((dsa_p_dup = BN_dup(dsa_p)) == NULL || 1825 (dsa_q_dup = BN_dup(dsa_q)) == NULL || 1826 (dsa_g_dup = BN_dup(dsa_g)) == NULL || 1827 (dsa_pub_key_dup = BN_dup(dsa_pub_key)) == NULL) { 1828 r = SSH_ERR_ALLOC_FAIL; 1829 goto out; 1830 } 1831 if (!DSA_set0_pqg(n->dsa, dsa_p_dup, dsa_q_dup, dsa_g_dup)) { 1832 r = SSH_ERR_LIBCRYPTO_ERROR; 1833 goto out; 1834 } 1835 dsa_p_dup = dsa_q_dup = dsa_g_dup = NULL; /* transferred */ 1836 if (!DSA_set0_key(n->dsa, dsa_pub_key_dup, NULL)) { 1837 r = SSH_ERR_LIBCRYPTO_ERROR; 1838 goto out; 1839 } 1840 dsa_pub_key_dup = NULL; /* transferred */ 1841 1842 break; 1843 case KEY_ECDSA: 1844 case KEY_ECDSA_CERT: 1845 case KEY_ECDSA_SK: 1846 case KEY_ECDSA_SK_CERT: 1847 n->ecdsa_nid = k->ecdsa_nid; 1848 n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); 1849 if (n->ecdsa == NULL) { 1850 r = SSH_ERR_ALLOC_FAIL; 1851 goto out; 1852 } 1853 if (EC_KEY_set_public_key(n->ecdsa, 1854 EC_KEY_get0_public_key(k->ecdsa)) != 1) { 1855 r = SSH_ERR_LIBCRYPTO_ERROR; 1856 goto out; 1857 } 1858 if (k->type != KEY_ECDSA_SK && k->type != KEY_ECDSA_SK_CERT) 1859 break; 1860 /* Append security-key application string */ 1861 if ((n->sk_application = strdup(k->sk_application)) == NULL) 1862 goto out; 1863 break; 1864 case KEY_RSA: 1865 case KEY_RSA_CERT: 1866 RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL); 1867 if ((rsa_n_dup = BN_dup(rsa_n)) == NULL || 1868 (rsa_e_dup = BN_dup(rsa_e)) == NULL) { 1869 r = SSH_ERR_ALLOC_FAIL; 1870 goto out; 1871 } 1872 if (!RSA_set0_key(n->rsa, rsa_n_dup, rsa_e_dup, NULL)) { 1873 r = SSH_ERR_LIBCRYPTO_ERROR; 1874 goto out; 1875 } 1876 rsa_n_dup = rsa_e_dup = NULL; /* transferred */ 1877 break; 1878 #endif /* WITH_OPENSSL */ 1879 case KEY_ED25519: 1880 case KEY_ED25519_CERT: 1881 case KEY_ED25519_SK: 1882 case KEY_ED25519_SK_CERT: 1883 if (k->ed25519_pk != NULL) { 1884 if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) { 1885 r = SSH_ERR_ALLOC_FAIL; 1886 goto out; 1887 } 1888 memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ); 1889 } 1890 if (k->type != KEY_ED25519_SK && 1891 k->type != KEY_ED25519_SK_CERT) 1892 break; 1893 /* Append security-key application string */ 1894 if ((n->sk_application = strdup(k->sk_application)) == NULL) 1895 goto out; 1896 break; 1897 #ifdef WITH_XMSS 1898 case KEY_XMSS: 1899 case KEY_XMSS_CERT: 1900 if ((r = sshkey_xmss_init(n, k->xmss_name)) != 0) 1901 goto out; 1902 if (k->xmss_pk != NULL) { 1903 u_int32_t left; 1904 size_t pklen = sshkey_xmss_pklen(k); 1905 if (pklen == 0 || sshkey_xmss_pklen(n) != pklen) { 1906 r = SSH_ERR_INTERNAL_ERROR; 1907 goto out; 1908 } 1909 if ((n->xmss_pk = malloc(pklen)) == NULL) { 1910 r = SSH_ERR_ALLOC_FAIL; 1911 goto out; 1912 } 1913 memcpy(n->xmss_pk, k->xmss_pk, pklen); 1914 /* simulate number of signatures left on pubkey */ 1915 left = sshkey_xmss_signatures_left(k); 1916 if (left) 1917 sshkey_xmss_enable_maxsign(n, left); 1918 } 1919 break; 1920 #endif /* WITH_XMSS */ 1921 default: 1922 r = SSH_ERR_KEY_TYPE_UNKNOWN; 1923 goto out; 1924 } 1925 if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0) 1926 goto out; 1927 /* success */ 1928 *pkp = n; 1929 n = NULL; 1930 r = 0; 1931 out: 1932 sshkey_free(n); 1933 #ifdef WITH_OPENSSL 1934 BN_clear_free(rsa_n_dup); 1935 BN_clear_free(rsa_e_dup); 1936 BN_clear_free(dsa_p_dup); 1937 BN_clear_free(dsa_q_dup); 1938 BN_clear_free(dsa_g_dup); 1939 BN_clear_free(dsa_pub_key_dup); 1940 #endif /* WITH_OPENSSL */ 1941 1942 return r; 1943 } 1944 1945 int 1946 sshkey_is_shielded(struct sshkey *k) 1947 { 1948 return k != NULL && k->shielded_private != NULL; 1949 } 1950 1951 int 1952 sshkey_shield_private(struct sshkey *k) 1953 { 1954 struct sshbuf *prvbuf = NULL; 1955 u_char *prekey = NULL, *enc = NULL, keyiv[SSH_DIGEST_MAX_LENGTH]; 1956 struct sshcipher_ctx *cctx = NULL; 1957 const struct sshcipher *cipher; 1958 size_t i, enclen = 0; 1959 struct sshkey *kswap = NULL, tmp; 1960 int r = SSH_ERR_INTERNAL_ERROR; 1961 1962 #ifdef DEBUG_PK 1963 fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k)); 1964 #endif 1965 if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) { 1966 r = SSH_ERR_INVALID_ARGUMENT; 1967 goto out; 1968 } 1969 if (cipher_keylen(cipher) + cipher_ivlen(cipher) > 1970 ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) { 1971 r = SSH_ERR_INTERNAL_ERROR; 1972 goto out; 1973 } 1974 1975 /* Prepare a random pre-key, and from it an ephemeral key */ 1976 if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN)) == NULL) { 1977 r = SSH_ERR_ALLOC_FAIL; 1978 goto out; 1979 } 1980 arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN); 1981 if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH, 1982 prekey, SSHKEY_SHIELD_PREKEY_LEN, 1983 keyiv, SSH_DIGEST_MAX_LENGTH)) != 0) 1984 goto out; 1985 #ifdef DEBUG_PK 1986 fprintf(stderr, "%s: key+iv\n", __func__); 1987 sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH), 1988 stderr); 1989 #endif 1990 if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher), 1991 keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0) 1992 goto out; 1993 1994 /* Serialise and encrypt the private key using the ephemeral key */ 1995 if ((prvbuf = sshbuf_new()) == NULL) { 1996 r = SSH_ERR_ALLOC_FAIL; 1997 goto out; 1998 } 1999 if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0) 2000 goto out; 2001 if ((r = sshkey_private_serialize_opt(k, prvbuf, 2002 SSHKEY_SERIALIZE_SHIELD)) != 0) 2003 goto out; 2004 /* pad to cipher blocksize */ 2005 i = 0; 2006 while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) { 2007 if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0) 2008 goto out; 2009 } 2010 #ifdef DEBUG_PK 2011 fprintf(stderr, "%s: serialised\n", __func__); 2012 sshbuf_dump(prvbuf, stderr); 2013 #endif 2014 /* encrypt */ 2015 enclen = sshbuf_len(prvbuf); 2016 if ((enc = malloc(enclen)) == NULL) { 2017 r = SSH_ERR_ALLOC_FAIL; 2018 goto out; 2019 } 2020 if ((r = cipher_crypt(cctx, 0, enc, 2021 sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0) 2022 goto out; 2023 #ifdef DEBUG_PK 2024 fprintf(stderr, "%s: encrypted\n", __func__); 2025 sshbuf_dump_data(enc, enclen, stderr); 2026 #endif 2027 2028 /* Make a scrubbed, public-only copy of our private key argument */ 2029 if ((r = sshkey_from_private(k, &kswap)) != 0) 2030 goto out; 2031 2032 /* Swap the private key out (it will be destroyed below) */ 2033 tmp = *kswap; 2034 *kswap = *k; 2035 *k = tmp; 2036 2037 /* Insert the shielded key into our argument */ 2038 k->shielded_private = enc; 2039 k->shielded_len = enclen; 2040 k->shield_prekey = prekey; 2041 k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN; 2042 enc = prekey = NULL; /* transferred */ 2043 enclen = 0; 2044 2045 /* preserve key fields that are required for correct operation */ 2046 k->sk_flags = kswap->sk_flags; 2047 2048 /* success */ 2049 r = 0; 2050 2051 out: 2052 /* XXX behaviour on error - invalidate original private key? */ 2053 cipher_free(cctx); 2054 explicit_bzero(keyiv, sizeof(keyiv)); 2055 explicit_bzero(&tmp, sizeof(tmp)); 2056 freezero(enc, enclen); 2057 freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN); 2058 sshkey_free(kswap); 2059 sshbuf_free(prvbuf); 2060 return r; 2061 } 2062 2063 int 2064 sshkey_unshield_private(struct sshkey *k) 2065 { 2066 struct sshbuf *prvbuf = NULL; 2067 u_char pad, *cp, keyiv[SSH_DIGEST_MAX_LENGTH]; 2068 struct sshcipher_ctx *cctx = NULL; 2069 const struct sshcipher *cipher; 2070 size_t i; 2071 struct sshkey *kswap = NULL, tmp; 2072 int r = SSH_ERR_INTERNAL_ERROR; 2073 2074 #ifdef DEBUG_PK 2075 fprintf(stderr, "%s: entering for %s\n", __func__, sshkey_ssh_name(k)); 2076 #endif 2077 if (!sshkey_is_shielded(k)) 2078 return 0; /* nothing to do */ 2079 2080 if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER)) == NULL) { 2081 r = SSH_ERR_INVALID_ARGUMENT; 2082 goto out; 2083 } 2084 if (cipher_keylen(cipher) + cipher_ivlen(cipher) > 2085 ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH)) { 2086 r = SSH_ERR_INTERNAL_ERROR; 2087 goto out; 2088 } 2089 /* check size of shielded key blob */ 2090 if (k->shielded_len < cipher_blocksize(cipher) || 2091 (k->shielded_len % cipher_blocksize(cipher)) != 0) { 2092 r = SSH_ERR_INVALID_FORMAT; 2093 goto out; 2094 } 2095 2096 /* Calculate the ephemeral key from the prekey */ 2097 if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH, 2098 k->shield_prekey, k->shield_prekey_len, 2099 keyiv, SSH_DIGEST_MAX_LENGTH)) != 0) 2100 goto out; 2101 if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher), 2102 keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0) 2103 goto out; 2104 #ifdef DEBUG_PK 2105 fprintf(stderr, "%s: key+iv\n", __func__); 2106 sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH), 2107 stderr); 2108 #endif 2109 2110 /* Decrypt and parse the shielded private key using the ephemeral key */ 2111 if ((prvbuf = sshbuf_new()) == NULL) { 2112 r = SSH_ERR_ALLOC_FAIL; 2113 goto out; 2114 } 2115 if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0) 2116 goto out; 2117 /* decrypt */ 2118 #ifdef DEBUG_PK 2119 fprintf(stderr, "%s: encrypted\n", __func__); 2120 sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr); 2121 #endif 2122 if ((r = cipher_crypt(cctx, 0, cp, 2123 k->shielded_private, k->shielded_len, 0, 0)) != 0) 2124 goto out; 2125 #ifdef DEBUG_PK 2126 fprintf(stderr, "%s: serialised\n", __func__); 2127 sshbuf_dump(prvbuf, stderr); 2128 #endif 2129 /* Parse private key */ 2130 if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0) 2131 goto out; 2132 /* Check deterministic padding */ 2133 i = 0; 2134 while (sshbuf_len(prvbuf)) { 2135 if ((r = sshbuf_get_u8(prvbuf, &pad)) != 0) 2136 goto out; 2137 if (pad != (++i & 0xff)) { 2138 r = SSH_ERR_INVALID_FORMAT; 2139 goto out; 2140 } 2141 } 2142 2143 /* Swap the parsed key back into place */ 2144 tmp = *kswap; 2145 *kswap = *k; 2146 *k = tmp; 2147 2148 /* success */ 2149 r = 0; 2150 2151 out: 2152 cipher_free(cctx); 2153 explicit_bzero(keyiv, sizeof(keyiv)); 2154 explicit_bzero(&tmp, sizeof(tmp)); 2155 sshkey_free(kswap); 2156 sshbuf_free(prvbuf); 2157 return r; 2158 } 2159 2160 static int 2161 cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf) 2162 { 2163 struct sshbuf *principals = NULL, *crit = NULL; 2164 struct sshbuf *exts = NULL, *ca = NULL; 2165 u_char *sig = NULL; 2166 size_t signed_len = 0, slen = 0, kidlen = 0; 2167 int ret = SSH_ERR_INTERNAL_ERROR; 2168 2169 /* Copy the entire key blob for verification and later serialisation */ 2170 if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0) 2171 return ret; 2172 2173 /* Parse body of certificate up to signature */ 2174 if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 || 2175 (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 || 2176 (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 || 2177 (ret = sshbuf_froms(b, &principals)) != 0 || 2178 (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 || 2179 (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 || 2180 (ret = sshbuf_froms(b, &crit)) != 0 || 2181 (ret = sshbuf_froms(b, &exts)) != 0 || 2182 (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 || 2183 (ret = sshbuf_froms(b, &ca)) != 0) { 2184 /* XXX debug print error for ret */ 2185 ret = SSH_ERR_INVALID_FORMAT; 2186 goto out; 2187 } 2188 2189 /* Signature is left in the buffer so we can calculate this length */ 2190 signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b); 2191 2192 if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) { 2193 ret = SSH_ERR_INVALID_FORMAT; 2194 goto out; 2195 } 2196 2197 if (key->cert->type != SSH2_CERT_TYPE_USER && 2198 key->cert->type != SSH2_CERT_TYPE_HOST) { 2199 ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE; 2200 goto out; 2201 } 2202 2203 /* Parse principals section */ 2204 while (sshbuf_len(principals) > 0) { 2205 char *principal = NULL; 2206 char **oprincipals = NULL; 2207 2208 if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) { 2209 ret = SSH_ERR_INVALID_FORMAT; 2210 goto out; 2211 } 2212 if ((ret = sshbuf_get_cstring(principals, &principal, 2213 NULL)) != 0) { 2214 ret = SSH_ERR_INVALID_FORMAT; 2215 goto out; 2216 } 2217 oprincipals = key->cert->principals; 2218 key->cert->principals = recallocarray(key->cert->principals, 2219 key->cert->nprincipals, key->cert->nprincipals + 1, 2220 sizeof(*key->cert->principals)); 2221 if (key->cert->principals == NULL) { 2222 free(principal); 2223 key->cert->principals = oprincipals; 2224 ret = SSH_ERR_ALLOC_FAIL; 2225 goto out; 2226 } 2227 key->cert->principals[key->cert->nprincipals++] = principal; 2228 } 2229 2230 /* 2231 * Stash a copies of the critical options and extensions sections 2232 * for later use. 2233 */ 2234 if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 || 2235 (exts != NULL && 2236 (ret = sshbuf_putb(key->cert->extensions, exts)) != 0)) 2237 goto out; 2238 2239 /* 2240 * Validate critical options and extensions sections format. 2241 */ 2242 while (sshbuf_len(crit) != 0) { 2243 if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 || 2244 (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) { 2245 sshbuf_reset(key->cert->critical); 2246 ret = SSH_ERR_INVALID_FORMAT; 2247 goto out; 2248 } 2249 } 2250 while (exts != NULL && sshbuf_len(exts) != 0) { 2251 if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 || 2252 (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) { 2253 sshbuf_reset(key->cert->extensions); 2254 ret = SSH_ERR_INVALID_FORMAT; 2255 goto out; 2256 } 2257 } 2258 2259 /* Parse CA key and check signature */ 2260 if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) { 2261 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 2262 goto out; 2263 } 2264 if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) { 2265 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 2266 goto out; 2267 } 2268 if ((ret = sshkey_verify(key->cert->signature_key, sig, slen, 2269 sshbuf_ptr(key->cert->certblob), signed_len, NULL, 0, NULL)) != 0) 2270 goto out; 2271 if ((ret = sshkey_get_sigtype(sig, slen, 2272 &key->cert->signature_type)) != 0) 2273 goto out; 2274 2275 /* Success */ 2276 ret = 0; 2277 out: 2278 sshbuf_free(ca); 2279 sshbuf_free(crit); 2280 sshbuf_free(exts); 2281 sshbuf_free(principals); 2282 free(sig); 2283 return ret; 2284 } 2285 2286 #ifdef WITH_OPENSSL 2287 static int 2288 check_rsa_length(const RSA *rsa) 2289 { 2290 const BIGNUM *rsa_n; 2291 2292 RSA_get0_key(rsa, &rsa_n, NULL, NULL); 2293 if (BN_num_bits(rsa_n) < SSH_RSA_MINIMUM_MODULUS_SIZE) 2294 return SSH_ERR_KEY_LENGTH; 2295 return 0; 2296 } 2297 #endif /* WITH_OPENSSL */ 2298 2299 static int 2300 sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp, 2301 int allow_cert) 2302 { 2303 int type, ret = SSH_ERR_INTERNAL_ERROR; 2304 char *ktype = NULL, *curve = NULL, *xmss_name = NULL; 2305 struct sshkey *key = NULL; 2306 size_t len; 2307 u_char *pk = NULL; 2308 struct sshbuf *copy; 2309 #ifdef WITH_OPENSSL 2310 EC_POINT *q = NULL, *qq = NULL; 2311 BIGNUM *rsa_n = NULL, *rsa_e = NULL; 2312 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_pub_key = NULL; 2313 #endif /* WITH_OPENSSL */ 2314 2315 #ifdef DEBUG_PK /* XXX */ 2316 sshbuf_dump(b, stderr); 2317 #endif 2318 if (keyp != NULL) 2319 *keyp = NULL; 2320 if ((copy = sshbuf_fromb(b)) == NULL) { 2321 ret = SSH_ERR_ALLOC_FAIL; 2322 goto out; 2323 } 2324 if (sshbuf_get_cstring(b, &ktype, NULL) != 0) { 2325 ret = SSH_ERR_INVALID_FORMAT; 2326 goto out; 2327 } 2328 2329 type = sshkey_type_from_name(ktype); 2330 if (!allow_cert && sshkey_type_is_cert(type)) { 2331 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 2332 goto out; 2333 } 2334 switch (type) { 2335 #ifdef WITH_OPENSSL 2336 case KEY_RSA_CERT: 2337 /* Skip nonce */ 2338 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 2339 ret = SSH_ERR_INVALID_FORMAT; 2340 goto out; 2341 } 2342 /* FALLTHROUGH */ 2343 case KEY_RSA: 2344 if ((key = sshkey_new(type)) == NULL) { 2345 ret = SSH_ERR_ALLOC_FAIL; 2346 goto out; 2347 } 2348 if (sshbuf_get_bignum2(b, &rsa_e) != 0 || 2349 sshbuf_get_bignum2(b, &rsa_n) != 0) { 2350 ret = SSH_ERR_INVALID_FORMAT; 2351 goto out; 2352 } 2353 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, NULL)) { 2354 ret = SSH_ERR_LIBCRYPTO_ERROR; 2355 goto out; 2356 } 2357 rsa_n = rsa_e = NULL; /* transferred */ 2358 if ((ret = check_rsa_length(key->rsa)) != 0) 2359 goto out; 2360 #ifdef DEBUG_PK 2361 RSA_print_fp(stderr, key->rsa, 8); 2362 #endif 2363 break; 2364 case KEY_DSA_CERT: 2365 /* Skip nonce */ 2366 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 2367 ret = SSH_ERR_INVALID_FORMAT; 2368 goto out; 2369 } 2370 /* FALLTHROUGH */ 2371 case KEY_DSA: 2372 if ((key = sshkey_new(type)) == NULL) { 2373 ret = SSH_ERR_ALLOC_FAIL; 2374 goto out; 2375 } 2376 if (sshbuf_get_bignum2(b, &dsa_p) != 0 || 2377 sshbuf_get_bignum2(b, &dsa_q) != 0 || 2378 sshbuf_get_bignum2(b, &dsa_g) != 0 || 2379 sshbuf_get_bignum2(b, &dsa_pub_key) != 0) { 2380 ret = SSH_ERR_INVALID_FORMAT; 2381 goto out; 2382 } 2383 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g)) { 2384 ret = SSH_ERR_LIBCRYPTO_ERROR; 2385 goto out; 2386 } 2387 dsa_p = dsa_q = dsa_g = NULL; /* transferred */ 2388 if (!DSA_set0_key(key->dsa, dsa_pub_key, NULL)) { 2389 ret = SSH_ERR_LIBCRYPTO_ERROR; 2390 goto out; 2391 } 2392 dsa_pub_key = NULL; /* transferred */ 2393 #ifdef DEBUG_PK 2394 DSA_print_fp(stderr, key->dsa, 8); 2395 #endif 2396 break; 2397 case KEY_ECDSA_CERT: 2398 case KEY_ECDSA_SK_CERT: 2399 /* Skip nonce */ 2400 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 2401 ret = SSH_ERR_INVALID_FORMAT; 2402 goto out; 2403 } 2404 /* FALLTHROUGH */ 2405 case KEY_ECDSA: 2406 case KEY_ECDSA_SK: 2407 if ((key = sshkey_new(type)) == NULL) { 2408 ret = SSH_ERR_ALLOC_FAIL; 2409 goto out; 2410 } 2411 key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype); 2412 if (sshbuf_get_cstring(b, &curve, NULL) != 0) { 2413 ret = SSH_ERR_INVALID_FORMAT; 2414 goto out; 2415 } 2416 if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { 2417 ret = SSH_ERR_EC_CURVE_MISMATCH; 2418 goto out; 2419 } 2420 EC_KEY_free(key->ecdsa); 2421 if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid)) 2422 == NULL) { 2423 ret = SSH_ERR_EC_CURVE_INVALID; 2424 goto out; 2425 } 2426 if ((qq = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) { 2427 ret = SSH_ERR_ALLOC_FAIL; 2428 goto out; 2429 } 2430 if (sshbuf_get_ec(b, qq, EC_KEY_get0_group(key->ecdsa)) != 0) { 2431 ret = SSH_ERR_INVALID_FORMAT; 2432 goto out; 2433 } 2434 if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa), 2435 qq) != 0) { 2436 ret = SSH_ERR_KEY_INVALID_EC_VALUE; 2437 goto out; 2438 } 2439 if (EC_KEY_set_public_key(key->ecdsa, qq) != 1) { 2440 /* XXX assume it is a allocation error */ 2441 ret = SSH_ERR_ALLOC_FAIL; 2442 goto out; 2443 } 2444 #ifdef DEBUG_PK 2445 sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), qq); 2446 #endif 2447 if (type == KEY_ECDSA_SK || type == KEY_ECDSA_SK_CERT) { 2448 /* Parse additional security-key application string */ 2449 if (sshbuf_get_cstring(b, &key->sk_application, 2450 NULL) != 0) { 2451 ret = SSH_ERR_INVALID_FORMAT; 2452 goto out; 2453 } 2454 #ifdef DEBUG_PK 2455 fprintf(stderr, "App: %s\n", key->sk_application); 2456 #endif 2457 } 2458 break; 2459 #endif /* WITH_OPENSSL */ 2460 case KEY_ED25519_CERT: 2461 case KEY_ED25519_SK_CERT: 2462 /* Skip nonce */ 2463 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 2464 ret = SSH_ERR_INVALID_FORMAT; 2465 goto out; 2466 } 2467 /* FALLTHROUGH */ 2468 case KEY_ED25519: 2469 case KEY_ED25519_SK: 2470 if ((ret = sshbuf_get_string(b, &pk, &len)) != 0) 2471 goto out; 2472 if (len != ED25519_PK_SZ) { 2473 ret = SSH_ERR_INVALID_FORMAT; 2474 goto out; 2475 } 2476 if ((key = sshkey_new(type)) == NULL) { 2477 ret = SSH_ERR_ALLOC_FAIL; 2478 goto out; 2479 } 2480 if (type == KEY_ED25519_SK || type == KEY_ED25519_SK_CERT) { 2481 /* Parse additional security-key application string */ 2482 if (sshbuf_get_cstring(b, &key->sk_application, 2483 NULL) != 0) { 2484 ret = SSH_ERR_INVALID_FORMAT; 2485 goto out; 2486 } 2487 #ifdef DEBUG_PK 2488 fprintf(stderr, "App: %s\n", key->sk_application); 2489 #endif 2490 } 2491 key->ed25519_pk = pk; 2492 pk = NULL; 2493 break; 2494 #ifdef WITH_XMSS 2495 case KEY_XMSS_CERT: 2496 /* Skip nonce */ 2497 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 2498 ret = SSH_ERR_INVALID_FORMAT; 2499 goto out; 2500 } 2501 /* FALLTHROUGH */ 2502 case KEY_XMSS: 2503 if ((ret = sshbuf_get_cstring(b, &xmss_name, NULL)) != 0) 2504 goto out; 2505 if ((key = sshkey_new(type)) == NULL) { 2506 ret = SSH_ERR_ALLOC_FAIL; 2507 goto out; 2508 } 2509 if ((ret = sshkey_xmss_init(key, xmss_name)) != 0) 2510 goto out; 2511 if ((ret = sshbuf_get_string(b, &pk, &len)) != 0) 2512 goto out; 2513 if (len == 0 || len != sshkey_xmss_pklen(key)) { 2514 ret = SSH_ERR_INVALID_FORMAT; 2515 goto out; 2516 } 2517 key->xmss_pk = pk; 2518 pk = NULL; 2519 if (type != KEY_XMSS_CERT && 2520 (ret = sshkey_xmss_deserialize_pk_info(key, b)) != 0) 2521 goto out; 2522 break; 2523 #endif /* WITH_XMSS */ 2524 case KEY_UNSPEC: 2525 default: 2526 ret = SSH_ERR_KEY_TYPE_UNKNOWN; 2527 goto out; 2528 } 2529 2530 /* Parse certificate potion */ 2531 if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0) 2532 goto out; 2533 2534 if (key != NULL && sshbuf_len(b) != 0) { 2535 ret = SSH_ERR_INVALID_FORMAT; 2536 goto out; 2537 } 2538 ret = 0; 2539 if (keyp != NULL) { 2540 *keyp = key; 2541 key = NULL; 2542 } 2543 out: 2544 sshbuf_free(copy); 2545 sshkey_free(key); 2546 free(xmss_name); 2547 free(ktype); 2548 free(curve); 2549 free(pk); 2550 #ifdef WITH_OPENSSL 2551 EC_POINT_free(q); 2552 BN_clear_free(rsa_n); 2553 BN_clear_free(rsa_e); 2554 BN_clear_free(dsa_p); 2555 BN_clear_free(dsa_q); 2556 BN_clear_free(dsa_g); 2557 BN_clear_free(dsa_pub_key); 2558 #endif /* WITH_OPENSSL */ 2559 return ret; 2560 } 2561 2562 int 2563 sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp) 2564 { 2565 struct sshbuf *b; 2566 int r; 2567 2568 if ((b = sshbuf_from(blob, blen)) == NULL) 2569 return SSH_ERR_ALLOC_FAIL; 2570 r = sshkey_from_blob_internal(b, keyp, 1); 2571 sshbuf_free(b); 2572 return r; 2573 } 2574 2575 int 2576 sshkey_fromb(struct sshbuf *b, struct sshkey **keyp) 2577 { 2578 return sshkey_from_blob_internal(b, keyp, 1); 2579 } 2580 2581 int 2582 sshkey_froms(struct sshbuf *buf, struct sshkey **keyp) 2583 { 2584 struct sshbuf *b; 2585 int r; 2586 2587 if ((r = sshbuf_froms(buf, &b)) != 0) 2588 return r; 2589 r = sshkey_from_blob_internal(b, keyp, 1); 2590 sshbuf_free(b); 2591 return r; 2592 } 2593 2594 int 2595 sshkey_get_sigtype(const u_char *sig, size_t siglen, char **sigtypep) 2596 { 2597 int r; 2598 struct sshbuf *b = NULL; 2599 char *sigtype = NULL; 2600 2601 if (sigtypep != NULL) 2602 *sigtypep = NULL; 2603 if ((b = sshbuf_from(sig, siglen)) == NULL) 2604 return SSH_ERR_ALLOC_FAIL; 2605 if ((r = sshbuf_get_cstring(b, &sigtype, NULL)) != 0) 2606 goto out; 2607 /* success */ 2608 if (sigtypep != NULL) { 2609 *sigtypep = sigtype; 2610 sigtype = NULL; 2611 } 2612 r = 0; 2613 out: 2614 free(sigtype); 2615 sshbuf_free(b); 2616 return r; 2617 } 2618 2619 /* 2620 * 2621 * Checks whether a certificate's signature type is allowed. 2622 * Returns 0 (success) if the certificate signature type appears in the 2623 * "allowed" pattern-list, or the key is not a certificate to begin with. 2624 * Otherwise returns a ssherr.h code. 2625 */ 2626 int 2627 sshkey_check_cert_sigtype(const struct sshkey *key, const char *allowed) 2628 { 2629 if (key == NULL || allowed == NULL) 2630 return SSH_ERR_INVALID_ARGUMENT; 2631 if (!sshkey_type_is_cert(key->type)) 2632 return 0; 2633 if (key->cert == NULL || key->cert->signature_type == NULL) 2634 return SSH_ERR_INVALID_ARGUMENT; 2635 if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1) 2636 return SSH_ERR_SIGN_ALG_UNSUPPORTED; 2637 return 0; 2638 } 2639 2640 /* 2641 * Returns the expected signature algorithm for a given public key algorithm. 2642 */ 2643 const char * 2644 sshkey_sigalg_by_name(const char *name) 2645 { 2646 const struct keytype *kt; 2647 2648 for (kt = keytypes; kt->type != -1; kt++) { 2649 if (strcmp(kt->name, name) != 0) 2650 continue; 2651 if (kt->sigalg != NULL) 2652 return kt->sigalg; 2653 if (!kt->cert) 2654 return kt->name; 2655 return sshkey_ssh_name_from_type_nid( 2656 sshkey_type_plain(kt->type), kt->nid); 2657 } 2658 return NULL; 2659 } 2660 2661 /* 2662 * Verifies that the signature algorithm appearing inside the signature blob 2663 * matches that which was requested. 2664 */ 2665 int 2666 sshkey_check_sigtype(const u_char *sig, size_t siglen, 2667 const char *requested_alg) 2668 { 2669 const char *expected_alg; 2670 char *sigtype = NULL; 2671 int r; 2672 2673 if (requested_alg == NULL) 2674 return 0; 2675 if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL) 2676 return SSH_ERR_INVALID_ARGUMENT; 2677 if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0) 2678 return r; 2679 r = strcmp(expected_alg, sigtype) == 0; 2680 free(sigtype); 2681 return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED; 2682 } 2683 2684 int 2685 sshkey_sign(struct sshkey *key, 2686 u_char **sigp, size_t *lenp, 2687 const u_char *data, size_t datalen, 2688 const char *alg, const char *sk_provider, const char *sk_pin, u_int compat) 2689 { 2690 int was_shielded = sshkey_is_shielded(key); 2691 int r2, r = SSH_ERR_INTERNAL_ERROR; 2692 2693 if (sigp != NULL) 2694 *sigp = NULL; 2695 if (lenp != NULL) 2696 *lenp = 0; 2697 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE) 2698 return SSH_ERR_INVALID_ARGUMENT; 2699 if ((r = sshkey_unshield_private(key)) != 0) 2700 return r; 2701 switch (key->type) { 2702 #ifdef WITH_OPENSSL 2703 case KEY_DSA_CERT: 2704 case KEY_DSA: 2705 r = ssh_dss_sign(key, sigp, lenp, data, datalen, compat); 2706 break; 2707 case KEY_ECDSA_CERT: 2708 case KEY_ECDSA: 2709 r = ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat); 2710 break; 2711 case KEY_RSA_CERT: 2712 case KEY_RSA: 2713 r = ssh_rsa_sign(key, sigp, lenp, data, datalen, alg); 2714 break; 2715 #endif /* WITH_OPENSSL */ 2716 case KEY_ED25519: 2717 case KEY_ED25519_CERT: 2718 r = ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat); 2719 break; 2720 case KEY_ED25519_SK: 2721 case KEY_ED25519_SK_CERT: 2722 case KEY_ECDSA_SK_CERT: 2723 case KEY_ECDSA_SK: 2724 r = sshsk_sign(sk_provider, key, sigp, lenp, data, 2725 datalen, compat, sk_pin); 2726 break; 2727 #ifdef WITH_XMSS 2728 case KEY_XMSS: 2729 case KEY_XMSS_CERT: 2730 r = ssh_xmss_sign(key, sigp, lenp, data, datalen, compat); 2731 break; 2732 #endif /* WITH_XMSS */ 2733 default: 2734 r = SSH_ERR_KEY_TYPE_UNKNOWN; 2735 break; 2736 } 2737 if (was_shielded && (r2 = sshkey_shield_private(key)) != 0) 2738 return r2; 2739 return r; 2740 } 2741 2742 /* 2743 * ssh_key_verify returns 0 for a correct signature and < 0 on error. 2744 * If "alg" specified, then the signature must use that algorithm. 2745 */ 2746 int 2747 sshkey_verify(const struct sshkey *key, 2748 const u_char *sig, size_t siglen, 2749 const u_char *data, size_t dlen, const char *alg, u_int compat, 2750 struct sshkey_sig_details **detailsp) 2751 { 2752 if (detailsp != NULL) 2753 *detailsp = NULL; 2754 if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE) 2755 return SSH_ERR_INVALID_ARGUMENT; 2756 switch (key->type) { 2757 #ifdef WITH_OPENSSL 2758 case KEY_DSA_CERT: 2759 case KEY_DSA: 2760 return ssh_dss_verify(key, sig, siglen, data, dlen, compat); 2761 case KEY_ECDSA_CERT: 2762 case KEY_ECDSA: 2763 return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat); 2764 case KEY_ECDSA_SK_CERT: 2765 case KEY_ECDSA_SK: 2766 return ssh_ecdsa_sk_verify(key, sig, siglen, data, dlen, 2767 compat, detailsp); 2768 case KEY_RSA_CERT: 2769 case KEY_RSA: 2770 return ssh_rsa_verify(key, sig, siglen, data, dlen, alg); 2771 #endif /* WITH_OPENSSL */ 2772 case KEY_ED25519: 2773 case KEY_ED25519_CERT: 2774 return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat); 2775 case KEY_ED25519_SK: 2776 case KEY_ED25519_SK_CERT: 2777 return ssh_ed25519_sk_verify(key, sig, siglen, data, dlen, 2778 compat, detailsp); 2779 #ifdef WITH_XMSS 2780 case KEY_XMSS: 2781 case KEY_XMSS_CERT: 2782 return ssh_xmss_verify(key, sig, siglen, data, dlen, compat); 2783 #endif /* WITH_XMSS */ 2784 default: 2785 return SSH_ERR_KEY_TYPE_UNKNOWN; 2786 } 2787 } 2788 2789 /* Convert a plain key to their _CERT equivalent */ 2790 int 2791 sshkey_to_certified(struct sshkey *k) 2792 { 2793 int newtype; 2794 2795 switch (k->type) { 2796 #ifdef WITH_OPENSSL 2797 case KEY_RSA: 2798 newtype = KEY_RSA_CERT; 2799 break; 2800 case KEY_DSA: 2801 newtype = KEY_DSA_CERT; 2802 break; 2803 case KEY_ECDSA: 2804 newtype = KEY_ECDSA_CERT; 2805 break; 2806 case KEY_ECDSA_SK: 2807 newtype = KEY_ECDSA_SK_CERT; 2808 break; 2809 #endif /* WITH_OPENSSL */ 2810 case KEY_ED25519_SK: 2811 newtype = KEY_ED25519_SK_CERT; 2812 break; 2813 case KEY_ED25519: 2814 newtype = KEY_ED25519_CERT; 2815 break; 2816 #ifdef WITH_XMSS 2817 case KEY_XMSS: 2818 newtype = KEY_XMSS_CERT; 2819 break; 2820 #endif /* WITH_XMSS */ 2821 default: 2822 return SSH_ERR_INVALID_ARGUMENT; 2823 } 2824 if ((k->cert = cert_new()) == NULL) 2825 return SSH_ERR_ALLOC_FAIL; 2826 k->type = newtype; 2827 return 0; 2828 } 2829 2830 /* Convert a certificate to its raw key equivalent */ 2831 int 2832 sshkey_drop_cert(struct sshkey *k) 2833 { 2834 if (!sshkey_type_is_cert(k->type)) 2835 return SSH_ERR_KEY_TYPE_UNKNOWN; 2836 cert_free(k->cert); 2837 k->cert = NULL; 2838 k->type = sshkey_type_plain(k->type); 2839 return 0; 2840 } 2841 2842 /* Sign a certified key, (re-)generating the signed certblob. */ 2843 int 2844 sshkey_certify_custom(struct sshkey *k, struct sshkey *ca, const char *alg, 2845 const char *sk_provider, const char *sk_pin, 2846 sshkey_certify_signer *signer, void *signer_ctx) 2847 { 2848 struct sshbuf *principals = NULL; 2849 u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32]; 2850 size_t i, ca_len, sig_len; 2851 int ret = SSH_ERR_INTERNAL_ERROR; 2852 struct sshbuf *cert = NULL; 2853 char *sigtype = NULL; 2854 #ifdef WITH_OPENSSL 2855 const BIGNUM *rsa_n, *rsa_e, *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key; 2856 #endif /* WITH_OPENSSL */ 2857 2858 if (k == NULL || k->cert == NULL || 2859 k->cert->certblob == NULL || ca == NULL) 2860 return SSH_ERR_INVALID_ARGUMENT; 2861 if (!sshkey_is_cert(k)) 2862 return SSH_ERR_KEY_TYPE_UNKNOWN; 2863 if (!sshkey_type_is_valid_ca(ca->type)) 2864 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 2865 2866 /* 2867 * If no alg specified as argument but a signature_type was set, 2868 * then prefer that. If both were specified, then they must match. 2869 */ 2870 if (alg == NULL) 2871 alg = k->cert->signature_type; 2872 else if (k->cert->signature_type != NULL && 2873 strcmp(alg, k->cert->signature_type) != 0) 2874 return SSH_ERR_INVALID_ARGUMENT; 2875 2876 /* 2877 * If no signing algorithm or signature_type was specified and we're 2878 * using a RSA key, then default to a good signature algorithm. 2879 */ 2880 if (alg == NULL && ca->type == KEY_RSA) 2881 alg = "rsa-sha2-512"; 2882 2883 if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0) 2884 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 2885 2886 cert = k->cert->certblob; /* for readability */ 2887 sshbuf_reset(cert); 2888 if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0) 2889 goto out; 2890 2891 /* -v01 certs put nonce first */ 2892 arc4random_buf(&nonce, sizeof(nonce)); 2893 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0) 2894 goto out; 2895 2896 /* XXX this substantially duplicates to_blob(); refactor */ 2897 switch (k->type) { 2898 #ifdef WITH_OPENSSL 2899 case KEY_DSA_CERT: 2900 DSA_get0_pqg(k->dsa, &dsa_p, &dsa_q, &dsa_g); 2901 DSA_get0_key(k->dsa, &dsa_pub_key, NULL); 2902 if ((ret = sshbuf_put_bignum2(cert, dsa_p)) != 0 || 2903 (ret = sshbuf_put_bignum2(cert, dsa_q)) != 0 || 2904 (ret = sshbuf_put_bignum2(cert, dsa_g)) != 0 || 2905 (ret = sshbuf_put_bignum2(cert, dsa_pub_key)) != 0) 2906 goto out; 2907 break; 2908 case KEY_ECDSA_CERT: 2909 case KEY_ECDSA_SK_CERT: 2910 if ((ret = sshbuf_put_cstring(cert, 2911 sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 || 2912 (ret = sshbuf_put_ec(cert, 2913 EC_KEY_get0_public_key(k->ecdsa), 2914 EC_KEY_get0_group(k->ecdsa))) != 0) 2915 goto out; 2916 if (k->type == KEY_ECDSA_SK_CERT) { 2917 if ((ret = sshbuf_put_cstring(cert, 2918 k->sk_application)) != 0) 2919 goto out; 2920 } 2921 break; 2922 case KEY_RSA_CERT: 2923 RSA_get0_key(k->rsa, &rsa_n, &rsa_e, NULL); 2924 if ((ret = sshbuf_put_bignum2(cert, rsa_e)) != 0 || 2925 (ret = sshbuf_put_bignum2(cert, rsa_n)) != 0) 2926 goto out; 2927 break; 2928 #endif /* WITH_OPENSSL */ 2929 case KEY_ED25519_CERT: 2930 case KEY_ED25519_SK_CERT: 2931 if ((ret = sshbuf_put_string(cert, 2932 k->ed25519_pk, ED25519_PK_SZ)) != 0) 2933 goto out; 2934 if (k->type == KEY_ED25519_SK_CERT) { 2935 if ((ret = sshbuf_put_cstring(cert, 2936 k->sk_application)) != 0) 2937 goto out; 2938 } 2939 break; 2940 #ifdef WITH_XMSS 2941 case KEY_XMSS_CERT: 2942 if (k->xmss_name == NULL) { 2943 ret = SSH_ERR_INVALID_ARGUMENT; 2944 goto out; 2945 } 2946 if ((ret = sshbuf_put_cstring(cert, k->xmss_name)) || 2947 (ret = sshbuf_put_string(cert, 2948 k->xmss_pk, sshkey_xmss_pklen(k))) != 0) 2949 goto out; 2950 break; 2951 #endif /* WITH_XMSS */ 2952 default: 2953 ret = SSH_ERR_INVALID_ARGUMENT; 2954 goto out; 2955 } 2956 2957 if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 || 2958 (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 || 2959 (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0) 2960 goto out; 2961 2962 if ((principals = sshbuf_new()) == NULL) { 2963 ret = SSH_ERR_ALLOC_FAIL; 2964 goto out; 2965 } 2966 for (i = 0; i < k->cert->nprincipals; i++) { 2967 if ((ret = sshbuf_put_cstring(principals, 2968 k->cert->principals[i])) != 0) 2969 goto out; 2970 } 2971 if ((ret = sshbuf_put_stringb(cert, principals)) != 0 || 2972 (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 || 2973 (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 || 2974 (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 || 2975 (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 || 2976 (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */ 2977 (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0) 2978 goto out; 2979 2980 /* Sign the whole mess */ 2981 if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert), 2982 sshbuf_len(cert), alg, sk_provider, sk_pin, 0, signer_ctx)) != 0) 2983 goto out; 2984 /* Check and update signature_type against what was actually used */ 2985 if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0) 2986 goto out; 2987 if (alg != NULL && strcmp(alg, sigtype) != 0) { 2988 ret = SSH_ERR_SIGN_ALG_UNSUPPORTED; 2989 goto out; 2990 } 2991 if (k->cert->signature_type == NULL) { 2992 k->cert->signature_type = sigtype; 2993 sigtype = NULL; 2994 } 2995 /* Append signature and we are done */ 2996 if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0) 2997 goto out; 2998 ret = 0; 2999 out: 3000 if (ret != 0) 3001 sshbuf_reset(cert); 3002 free(sig_blob); 3003 free(ca_blob); 3004 free(sigtype); 3005 sshbuf_free(principals); 3006 return ret; 3007 } 3008 3009 static int 3010 default_key_sign(struct sshkey *key, u_char **sigp, size_t *lenp, 3011 const u_char *data, size_t datalen, 3012 const char *alg, const char *sk_provider, const char *sk_pin, 3013 u_int compat, void *ctx) 3014 { 3015 if (ctx != NULL) 3016 return SSH_ERR_INVALID_ARGUMENT; 3017 return sshkey_sign(key, sigp, lenp, data, datalen, alg, 3018 sk_provider, sk_pin, compat); 3019 } 3020 3021 int 3022 sshkey_certify(struct sshkey *k, struct sshkey *ca, const char *alg, 3023 const char *sk_provider, const char *sk_pin) 3024 { 3025 return sshkey_certify_custom(k, ca, alg, sk_provider, sk_pin, 3026 default_key_sign, NULL); 3027 } 3028 3029 int 3030 sshkey_cert_check_authority(const struct sshkey *k, 3031 int want_host, int require_principal, int wildcard_pattern, 3032 uint64_t verify_time, const char *name, const char **reason) 3033 { 3034 u_int i, principal_matches; 3035 3036 if (reason == NULL) 3037 return SSH_ERR_INVALID_ARGUMENT; 3038 if (!sshkey_is_cert(k)) { 3039 *reason = "Key is not a certificate"; 3040 return SSH_ERR_KEY_CERT_INVALID; 3041 } 3042 if (want_host) { 3043 if (k->cert->type != SSH2_CERT_TYPE_HOST) { 3044 *reason = "Certificate invalid: not a host certificate"; 3045 return SSH_ERR_KEY_CERT_INVALID; 3046 } 3047 } else { 3048 if (k->cert->type != SSH2_CERT_TYPE_USER) { 3049 *reason = "Certificate invalid: not a user certificate"; 3050 return SSH_ERR_KEY_CERT_INVALID; 3051 } 3052 } 3053 if (verify_time < k->cert->valid_after) { 3054 *reason = "Certificate invalid: not yet valid"; 3055 return SSH_ERR_KEY_CERT_INVALID; 3056 } 3057 if (verify_time >= k->cert->valid_before) { 3058 *reason = "Certificate invalid: expired"; 3059 return SSH_ERR_KEY_CERT_INVALID; 3060 } 3061 if (k->cert->nprincipals == 0) { 3062 if (require_principal) { 3063 *reason = "Certificate lacks principal list"; 3064 return SSH_ERR_KEY_CERT_INVALID; 3065 } 3066 } else if (name != NULL) { 3067 principal_matches = 0; 3068 for (i = 0; i < k->cert->nprincipals; i++) { 3069 if (wildcard_pattern) { 3070 if (match_pattern(k->cert->principals[i], 3071 name)) { 3072 principal_matches = 1; 3073 break; 3074 } 3075 } else if (strcmp(name, k->cert->principals[i]) == 0) { 3076 principal_matches = 1; 3077 break; 3078 } 3079 } 3080 if (!principal_matches) { 3081 *reason = "Certificate invalid: name is not a listed " 3082 "principal"; 3083 return SSH_ERR_KEY_CERT_INVALID; 3084 } 3085 } 3086 return 0; 3087 } 3088 3089 int 3090 sshkey_cert_check_authority_now(const struct sshkey *k, 3091 int want_host, int require_principal, int wildcard_pattern, 3092 const char *name, const char **reason) 3093 { 3094 time_t now; 3095 3096 if ((now = time(NULL)) < 0) { 3097 /* yikes - system clock before epoch! */ 3098 *reason = "Certificate invalid: not yet valid"; 3099 return SSH_ERR_KEY_CERT_INVALID; 3100 } 3101 return sshkey_cert_check_authority(k, want_host, require_principal, 3102 wildcard_pattern, (uint64_t)now, name, reason); 3103 } 3104 3105 int 3106 sshkey_cert_check_host(const struct sshkey *key, const char *host, 3107 int wildcard_principals, const char *ca_sign_algorithms, 3108 const char **reason) 3109 { 3110 int r; 3111 3112 if ((r = sshkey_cert_check_authority_now(key, 1, 0, wildcard_principals, 3113 host, reason)) != 0) 3114 return r; 3115 if (sshbuf_len(key->cert->critical) != 0) { 3116 *reason = "Certificate contains unsupported critical options"; 3117 return SSH_ERR_KEY_CERT_INVALID; 3118 } 3119 if (ca_sign_algorithms != NULL && 3120 (r = sshkey_check_cert_sigtype(key, ca_sign_algorithms)) != 0) { 3121 *reason = "Certificate signed with disallowed algorithm"; 3122 return SSH_ERR_KEY_CERT_INVALID; 3123 } 3124 return 0; 3125 } 3126 3127 size_t 3128 sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l) 3129 { 3130 char from[32], to[32], ret[128]; 3131 3132 *from = *to = '\0'; 3133 if (cert->valid_after == 0 && 3134 cert->valid_before == 0xffffffffffffffffULL) 3135 return strlcpy(s, "forever", l); 3136 3137 if (cert->valid_after != 0) 3138 format_absolute_time(cert->valid_after, from, sizeof(from)); 3139 if (cert->valid_before != 0xffffffffffffffffULL) 3140 format_absolute_time(cert->valid_before, to, sizeof(to)); 3141 3142 if (cert->valid_after == 0) 3143 snprintf(ret, sizeof(ret), "before %s", to); 3144 else if (cert->valid_before == 0xffffffffffffffffULL) 3145 snprintf(ret, sizeof(ret), "after %s", from); 3146 else 3147 snprintf(ret, sizeof(ret), "from %s to %s", from, to); 3148 3149 return strlcpy(s, ret, l); 3150 } 3151 3152 int 3153 sshkey_private_serialize_opt(struct sshkey *key, struct sshbuf *buf, 3154 enum sshkey_serialize_rep opts) 3155 { 3156 int r = SSH_ERR_INTERNAL_ERROR; 3157 int was_shielded = sshkey_is_shielded(key); 3158 struct sshbuf *b = NULL; 3159 #ifdef WITH_OPENSSL 3160 const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q; 3161 const BIGNUM *dsa_p, *dsa_q, *dsa_g, *dsa_pub_key, *dsa_priv_key; 3162 #endif /* WITH_OPENSSL */ 3163 3164 if ((r = sshkey_unshield_private(key)) != 0) 3165 return r; 3166 if ((b = sshbuf_new()) == NULL) 3167 return SSH_ERR_ALLOC_FAIL; 3168 if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0) 3169 goto out; 3170 switch (key->type) { 3171 #ifdef WITH_OPENSSL 3172 case KEY_RSA: 3173 RSA_get0_key(key->rsa, &rsa_n, &rsa_e, &rsa_d); 3174 RSA_get0_factors(key->rsa, &rsa_p, &rsa_q); 3175 RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp); 3176 if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 || 3177 (r = sshbuf_put_bignum2(b, rsa_e)) != 0 || 3178 (r = sshbuf_put_bignum2(b, rsa_d)) != 0 || 3179 (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 || 3180 (r = sshbuf_put_bignum2(b, rsa_p)) != 0 || 3181 (r = sshbuf_put_bignum2(b, rsa_q)) != 0) 3182 goto out; 3183 break; 3184 case KEY_RSA_CERT: 3185 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 3186 r = SSH_ERR_INVALID_ARGUMENT; 3187 goto out; 3188 } 3189 RSA_get0_key(key->rsa, NULL, NULL, &rsa_d); 3190 RSA_get0_factors(key->rsa, &rsa_p, &rsa_q); 3191 RSA_get0_crt_params(key->rsa, NULL, NULL, &rsa_iqmp); 3192 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 3193 (r = sshbuf_put_bignum2(b, rsa_d)) != 0 || 3194 (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 || 3195 (r = sshbuf_put_bignum2(b, rsa_p)) != 0 || 3196 (r = sshbuf_put_bignum2(b, rsa_q)) != 0) 3197 goto out; 3198 break; 3199 case KEY_DSA: 3200 DSA_get0_pqg(key->dsa, &dsa_p, &dsa_q, &dsa_g); 3201 DSA_get0_key(key->dsa, &dsa_pub_key, &dsa_priv_key); 3202 if ((r = sshbuf_put_bignum2(b, dsa_p)) != 0 || 3203 (r = sshbuf_put_bignum2(b, dsa_q)) != 0 || 3204 (r = sshbuf_put_bignum2(b, dsa_g)) != 0 || 3205 (r = sshbuf_put_bignum2(b, dsa_pub_key)) != 0 || 3206 (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0) 3207 goto out; 3208 break; 3209 case KEY_DSA_CERT: 3210 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 3211 r = SSH_ERR_INVALID_ARGUMENT; 3212 goto out; 3213 } 3214 DSA_get0_key(key->dsa, NULL, &dsa_priv_key); 3215 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 3216 (r = sshbuf_put_bignum2(b, dsa_priv_key)) != 0) 3217 goto out; 3218 break; 3219 case KEY_ECDSA: 3220 if ((r = sshbuf_put_cstring(b, 3221 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || 3222 (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 || 3223 (r = sshbuf_put_bignum2(b, 3224 EC_KEY_get0_private_key(key->ecdsa))) != 0) 3225 goto out; 3226 break; 3227 case KEY_ECDSA_CERT: 3228 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 3229 r = SSH_ERR_INVALID_ARGUMENT; 3230 goto out; 3231 } 3232 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 3233 (r = sshbuf_put_bignum2(b, 3234 EC_KEY_get0_private_key(key->ecdsa))) != 0) 3235 goto out; 3236 break; 3237 case KEY_ECDSA_SK: 3238 if ((r = sshbuf_put_cstring(b, 3239 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || 3240 (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 || 3241 (r = sshbuf_put_cstring(b, key->sk_application)) != 0 || 3242 (r = sshbuf_put_u8(b, key->sk_flags)) != 0 || 3243 (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 || 3244 (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0) 3245 goto out; 3246 break; 3247 case KEY_ECDSA_SK_CERT: 3248 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 3249 r = SSH_ERR_INVALID_ARGUMENT; 3250 goto out; 3251 } 3252 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 3253 (r = sshbuf_put_cstring(b, key->sk_application)) != 0 || 3254 (r = sshbuf_put_u8(b, key->sk_flags)) != 0 || 3255 (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 || 3256 (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0) 3257 goto out; 3258 break; 3259 #endif /* WITH_OPENSSL */ 3260 case KEY_ED25519: 3261 if ((r = sshbuf_put_string(b, key->ed25519_pk, 3262 ED25519_PK_SZ)) != 0 || 3263 (r = sshbuf_put_string(b, key->ed25519_sk, 3264 ED25519_SK_SZ)) != 0) 3265 goto out; 3266 break; 3267 case KEY_ED25519_CERT: 3268 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 3269 r = SSH_ERR_INVALID_ARGUMENT; 3270 goto out; 3271 } 3272 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 3273 (r = sshbuf_put_string(b, key->ed25519_pk, 3274 ED25519_PK_SZ)) != 0 || 3275 (r = sshbuf_put_string(b, key->ed25519_sk, 3276 ED25519_SK_SZ)) != 0) 3277 goto out; 3278 break; 3279 case KEY_ED25519_SK: 3280 if ((r = sshbuf_put_string(b, key->ed25519_pk, 3281 ED25519_PK_SZ)) != 0 || 3282 (r = sshbuf_put_cstring(b, key->sk_application)) != 0 || 3283 (r = sshbuf_put_u8(b, key->sk_flags)) != 0 || 3284 (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 || 3285 (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0) 3286 goto out; 3287 break; 3288 case KEY_ED25519_SK_CERT: 3289 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 3290 r = SSH_ERR_INVALID_ARGUMENT; 3291 goto out; 3292 } 3293 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 3294 (r = sshbuf_put_string(b, key->ed25519_pk, 3295 ED25519_PK_SZ)) != 0 || 3296 (r = sshbuf_put_cstring(b, key->sk_application)) != 0 || 3297 (r = sshbuf_put_u8(b, key->sk_flags)) != 0 || 3298 (r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 || 3299 (r = sshbuf_put_stringb(b, key->sk_reserved)) != 0) 3300 goto out; 3301 break; 3302 #ifdef WITH_XMSS 3303 case KEY_XMSS: 3304 if (key->xmss_name == NULL) { 3305 r = SSH_ERR_INVALID_ARGUMENT; 3306 goto out; 3307 } 3308 if ((r = sshbuf_put_cstring(b, key->xmss_name)) != 0 || 3309 (r = sshbuf_put_string(b, key->xmss_pk, 3310 sshkey_xmss_pklen(key))) != 0 || 3311 (r = sshbuf_put_string(b, key->xmss_sk, 3312 sshkey_xmss_sklen(key))) != 0 || 3313 (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0) 3314 goto out; 3315 break; 3316 case KEY_XMSS_CERT: 3317 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0 || 3318 key->xmss_name == NULL) { 3319 r = SSH_ERR_INVALID_ARGUMENT; 3320 goto out; 3321 } 3322 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 3323 (r = sshbuf_put_cstring(b, key->xmss_name)) != 0 || 3324 (r = sshbuf_put_string(b, key->xmss_pk, 3325 sshkey_xmss_pklen(key))) != 0 || 3326 (r = sshbuf_put_string(b, key->xmss_sk, 3327 sshkey_xmss_sklen(key))) != 0 || 3328 (r = sshkey_xmss_serialize_state_opt(key, b, opts)) != 0) 3329 goto out; 3330 break; 3331 #endif /* WITH_XMSS */ 3332 default: 3333 r = SSH_ERR_INVALID_ARGUMENT; 3334 goto out; 3335 } 3336 /* 3337 * success (but we still need to append the output to buf after 3338 * possibly re-shielding the private key) 3339 */ 3340 r = 0; 3341 out: 3342 if (was_shielded) 3343 r = sshkey_shield_private(key); 3344 if (r == 0) 3345 r = sshbuf_putb(buf, b); 3346 sshbuf_free(b); 3347 3348 return r; 3349 } 3350 3351 int 3352 sshkey_private_serialize(struct sshkey *key, struct sshbuf *b) 3353 { 3354 return sshkey_private_serialize_opt(key, b, 3355 SSHKEY_SERIALIZE_DEFAULT); 3356 } 3357 3358 int 3359 sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp) 3360 { 3361 char *tname = NULL, *curve = NULL, *xmss_name = NULL; 3362 char *expect_sk_application = NULL; 3363 struct sshkey *k = NULL; 3364 size_t pklen = 0, sklen = 0; 3365 int type, r = SSH_ERR_INTERNAL_ERROR; 3366 u_char *ed25519_pk = NULL, *ed25519_sk = NULL; 3367 u_char *expect_ed25519_pk = NULL; 3368 u_char *xmss_pk = NULL, *xmss_sk = NULL; 3369 #ifdef WITH_OPENSSL 3370 BIGNUM *exponent = NULL; 3371 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL; 3372 BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL; 3373 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL; 3374 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL; 3375 #endif /* WITH_OPENSSL */ 3376 3377 if (kp != NULL) 3378 *kp = NULL; 3379 if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0) 3380 goto out; 3381 type = sshkey_type_from_name(tname); 3382 if (sshkey_type_is_cert(type)) { 3383 /* 3384 * Certificate key private keys begin with the certificate 3385 * itself. Make sure this matches the type of the enclosing 3386 * private key. 3387 */ 3388 if ((r = sshkey_froms(buf, &k)) != 0) 3389 goto out; 3390 if (k->type != type) { 3391 r = SSH_ERR_KEY_CERT_MISMATCH; 3392 goto out; 3393 } 3394 /* For ECDSA keys, the group must match too */ 3395 if (k->type == KEY_ECDSA && 3396 k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) { 3397 r = SSH_ERR_KEY_CERT_MISMATCH; 3398 goto out; 3399 } 3400 /* 3401 * Several fields are redundant between certificate and 3402 * private key body, we require these to match. 3403 */ 3404 expect_sk_application = k->sk_application; 3405 expect_ed25519_pk = k->ed25519_pk; 3406 k->sk_application = NULL; 3407 k->ed25519_pk = NULL; 3408 } else { 3409 if ((k = sshkey_new(type)) == NULL) { 3410 r = SSH_ERR_ALLOC_FAIL; 3411 goto out; 3412 } 3413 } 3414 switch (type) { 3415 #ifdef WITH_OPENSSL 3416 case KEY_DSA: 3417 if ((r = sshbuf_get_bignum2(buf, &dsa_p)) != 0 || 3418 (r = sshbuf_get_bignum2(buf, &dsa_q)) != 0 || 3419 (r = sshbuf_get_bignum2(buf, &dsa_g)) != 0 || 3420 (r = sshbuf_get_bignum2(buf, &dsa_pub_key)) != 0) 3421 goto out; 3422 if (!DSA_set0_pqg(k->dsa, dsa_p, dsa_q, dsa_g)) { 3423 r = SSH_ERR_LIBCRYPTO_ERROR; 3424 goto out; 3425 } 3426 dsa_p = dsa_q = dsa_g = NULL; /* transferred */ 3427 if (!DSA_set0_key(k->dsa, dsa_pub_key, NULL)) { 3428 r = SSH_ERR_LIBCRYPTO_ERROR; 3429 goto out; 3430 } 3431 dsa_pub_key = NULL; /* transferred */ 3432 /* FALLTHROUGH */ 3433 case KEY_DSA_CERT: 3434 if ((r = sshbuf_get_bignum2(buf, &dsa_priv_key)) != 0) 3435 goto out; 3436 if (!DSA_set0_key(k->dsa, NULL, dsa_priv_key)) { 3437 r = SSH_ERR_LIBCRYPTO_ERROR; 3438 goto out; 3439 } 3440 dsa_priv_key = NULL; /* transferred */ 3441 break; 3442 case KEY_ECDSA: 3443 if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) { 3444 r = SSH_ERR_INVALID_ARGUMENT; 3445 goto out; 3446 } 3447 if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0) 3448 goto out; 3449 if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { 3450 r = SSH_ERR_EC_CURVE_MISMATCH; 3451 goto out; 3452 } 3453 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); 3454 if (k->ecdsa == NULL) { 3455 r = SSH_ERR_LIBCRYPTO_ERROR; 3456 goto out; 3457 } 3458 if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0) 3459 goto out; 3460 /* FALLTHROUGH */ 3461 case KEY_ECDSA_CERT: 3462 if ((r = sshbuf_get_bignum2(buf, &exponent)) != 0) 3463 goto out; 3464 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) { 3465 r = SSH_ERR_LIBCRYPTO_ERROR; 3466 goto out; 3467 } 3468 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa), 3469 EC_KEY_get0_public_key(k->ecdsa))) != 0 || 3470 (r = sshkey_ec_validate_private(k->ecdsa)) != 0) 3471 goto out; 3472 break; 3473 case KEY_ECDSA_SK: 3474 if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) { 3475 r = SSH_ERR_INVALID_ARGUMENT; 3476 goto out; 3477 } 3478 if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0) 3479 goto out; 3480 if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { 3481 r = SSH_ERR_EC_CURVE_MISMATCH; 3482 goto out; 3483 } 3484 if ((k->sk_key_handle = sshbuf_new()) == NULL || 3485 (k->sk_reserved = sshbuf_new()) == NULL) { 3486 r = SSH_ERR_ALLOC_FAIL; 3487 goto out; 3488 } 3489 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); 3490 if (k->ecdsa == NULL) { 3491 r = SSH_ERR_LIBCRYPTO_ERROR; 3492 goto out; 3493 } 3494 if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 || 3495 (r = sshbuf_get_cstring(buf, &k->sk_application, 3496 NULL)) != 0 || 3497 (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 || 3498 (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 || 3499 (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0) 3500 goto out; 3501 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa), 3502 EC_KEY_get0_public_key(k->ecdsa))) != 0) 3503 goto out; 3504 break; 3505 case KEY_ECDSA_SK_CERT: 3506 if ((k->sk_key_handle = sshbuf_new()) == NULL || 3507 (k->sk_reserved = sshbuf_new()) == NULL) { 3508 r = SSH_ERR_ALLOC_FAIL; 3509 goto out; 3510 } 3511 if ((r = sshbuf_get_cstring(buf, &k->sk_application, 3512 NULL)) != 0 || 3513 (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 || 3514 (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 || 3515 (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0) 3516 goto out; 3517 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa), 3518 EC_KEY_get0_public_key(k->ecdsa))) != 0) 3519 goto out; 3520 break; 3521 case KEY_RSA: 3522 if ((r = sshbuf_get_bignum2(buf, &rsa_n)) != 0 || 3523 (r = sshbuf_get_bignum2(buf, &rsa_e)) != 0) 3524 goto out; 3525 if (!RSA_set0_key(k->rsa, rsa_n, rsa_e, NULL)) { 3526 r = SSH_ERR_LIBCRYPTO_ERROR; 3527 goto out; 3528 } 3529 rsa_n = rsa_e = NULL; /* transferred */ 3530 /* FALLTHROUGH */ 3531 case KEY_RSA_CERT: 3532 if ((r = sshbuf_get_bignum2(buf, &rsa_d)) != 0 || 3533 (r = sshbuf_get_bignum2(buf, &rsa_iqmp)) != 0 || 3534 (r = sshbuf_get_bignum2(buf, &rsa_p)) != 0 || 3535 (r = sshbuf_get_bignum2(buf, &rsa_q)) != 0) 3536 goto out; 3537 if (!RSA_set0_key(k->rsa, NULL, NULL, rsa_d)) { 3538 r = SSH_ERR_LIBCRYPTO_ERROR; 3539 goto out; 3540 } 3541 rsa_d = NULL; /* transferred */ 3542 if (!RSA_set0_factors(k->rsa, rsa_p, rsa_q)) { 3543 r = SSH_ERR_LIBCRYPTO_ERROR; 3544 goto out; 3545 } 3546 rsa_p = rsa_q = NULL; /* transferred */ 3547 if ((r = check_rsa_length(k->rsa)) != 0) 3548 goto out; 3549 if ((r = ssh_rsa_complete_crt_parameters(k, rsa_iqmp)) != 0) 3550 goto out; 3551 break; 3552 #endif /* WITH_OPENSSL */ 3553 case KEY_ED25519: 3554 case KEY_ED25519_CERT: 3555 if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 || 3556 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0) 3557 goto out; 3558 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) { 3559 r = SSH_ERR_INVALID_FORMAT; 3560 goto out; 3561 } 3562 k->ed25519_pk = ed25519_pk; 3563 k->ed25519_sk = ed25519_sk; 3564 ed25519_pk = ed25519_sk = NULL; /* transferred */ 3565 break; 3566 case KEY_ED25519_SK: 3567 case KEY_ED25519_SK_CERT: 3568 if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0) 3569 goto out; 3570 if (pklen != ED25519_PK_SZ) { 3571 r = SSH_ERR_INVALID_FORMAT; 3572 goto out; 3573 } 3574 if ((k->sk_key_handle = sshbuf_new()) == NULL || 3575 (k->sk_reserved = sshbuf_new()) == NULL) { 3576 r = SSH_ERR_ALLOC_FAIL; 3577 goto out; 3578 } 3579 if ((r = sshbuf_get_cstring(buf, &k->sk_application, 3580 NULL)) != 0 || 3581 (r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 || 3582 (r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 || 3583 (r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0) 3584 goto out; 3585 k->ed25519_pk = ed25519_pk; 3586 ed25519_pk = NULL; /* transferred */ 3587 break; 3588 #ifdef WITH_XMSS 3589 case KEY_XMSS: 3590 case KEY_XMSS_CERT: 3591 if ((r = sshbuf_get_cstring(buf, &xmss_name, NULL)) != 0 || 3592 (r = sshbuf_get_string(buf, &xmss_pk, &pklen)) != 0 || 3593 (r = sshbuf_get_string(buf, &xmss_sk, &sklen)) != 0) 3594 goto out; 3595 if (type == KEY_XMSS && 3596 (r = sshkey_xmss_init(k, xmss_name)) != 0) 3597 goto out; 3598 if (pklen != sshkey_xmss_pklen(k) || 3599 sklen != sshkey_xmss_sklen(k)) { 3600 r = SSH_ERR_INVALID_FORMAT; 3601 goto out; 3602 } 3603 k->xmss_pk = xmss_pk; 3604 k->xmss_sk = xmss_sk; 3605 xmss_pk = xmss_sk = NULL; 3606 /* optional internal state */ 3607 if ((r = sshkey_xmss_deserialize_state_opt(k, buf)) != 0) 3608 goto out; 3609 break; 3610 #endif /* WITH_XMSS */ 3611 default: 3612 r = SSH_ERR_KEY_TYPE_UNKNOWN; 3613 goto out; 3614 } 3615 #ifdef WITH_OPENSSL 3616 /* enable blinding */ 3617 switch (k->type) { 3618 case KEY_RSA: 3619 case KEY_RSA_CERT: 3620 if (RSA_blinding_on(k->rsa, NULL) != 1) { 3621 r = SSH_ERR_LIBCRYPTO_ERROR; 3622 goto out; 3623 } 3624 break; 3625 } 3626 #endif /* WITH_OPENSSL */ 3627 if ((expect_sk_application != NULL && (k->sk_application == NULL || 3628 strcmp(expect_sk_application, k->sk_application) != 0)) || 3629 (expect_ed25519_pk != NULL && (k->ed25519_pk == NULL || 3630 memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ) != 0))) { 3631 r = SSH_ERR_KEY_CERT_MISMATCH; 3632 goto out; 3633 } 3634 /* success */ 3635 r = 0; 3636 if (kp != NULL) { 3637 *kp = k; 3638 k = NULL; 3639 } 3640 out: 3641 free(tname); 3642 free(curve); 3643 #ifdef WITH_OPENSSL 3644 BN_clear_free(exponent); 3645 BN_clear_free(dsa_p); 3646 BN_clear_free(dsa_q); 3647 BN_clear_free(dsa_g); 3648 BN_clear_free(dsa_pub_key); 3649 BN_clear_free(dsa_priv_key); 3650 BN_clear_free(rsa_n); 3651 BN_clear_free(rsa_e); 3652 BN_clear_free(rsa_d); 3653 BN_clear_free(rsa_p); 3654 BN_clear_free(rsa_q); 3655 BN_clear_free(rsa_iqmp); 3656 #endif /* WITH_OPENSSL */ 3657 sshkey_free(k); 3658 freezero(ed25519_pk, pklen); 3659 freezero(ed25519_sk, sklen); 3660 free(xmss_name); 3661 freezero(xmss_pk, pklen); 3662 freezero(xmss_sk, sklen); 3663 free(expect_sk_application); 3664 free(expect_ed25519_pk); 3665 return r; 3666 } 3667 3668 #ifdef WITH_OPENSSL 3669 int 3670 sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public) 3671 { 3672 EC_POINT *nq = NULL; 3673 BIGNUM *order = NULL, *x = NULL, *y = NULL, *tmp = NULL; 3674 int ret = SSH_ERR_KEY_INVALID_EC_VALUE; 3675 3676 /* 3677 * NB. This assumes OpenSSL has already verified that the public 3678 * point lies on the curve. This is done by EC_POINT_oct2point() 3679 * implicitly calling EC_POINT_is_on_curve(). If this code is ever 3680 * reachable with public points not unmarshalled using 3681 * EC_POINT_oct2point then the caller will need to explicitly check. 3682 */ 3683 3684 /* 3685 * We shouldn't ever hit this case because bignum_get_ecpoint() 3686 * refuses to load GF2m points. 3687 */ 3688 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != 3689 NID_X9_62_prime_field) 3690 goto out; 3691 3692 /* Q != infinity */ 3693 if (EC_POINT_is_at_infinity(group, public)) 3694 goto out; 3695 3696 if ((x = BN_new()) == NULL || 3697 (y = BN_new()) == NULL || 3698 (order = BN_new()) == NULL || 3699 (tmp = BN_new()) == NULL) { 3700 ret = SSH_ERR_ALLOC_FAIL; 3701 goto out; 3702 } 3703 3704 /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */ 3705 if (EC_GROUP_get_order(group, order, NULL) != 1 || 3706 EC_POINT_get_affine_coordinates_GFp(group, public, 3707 x, y, NULL) != 1) { 3708 ret = SSH_ERR_LIBCRYPTO_ERROR; 3709 goto out; 3710 } 3711 if (BN_num_bits(x) <= BN_num_bits(order) / 2 || 3712 BN_num_bits(y) <= BN_num_bits(order) / 2) 3713 goto out; 3714 3715 /* nQ == infinity (n == order of subgroup) */ 3716 if ((nq = EC_POINT_new(group)) == NULL) { 3717 ret = SSH_ERR_ALLOC_FAIL; 3718 goto out; 3719 } 3720 if (EC_POINT_mul(group, nq, NULL, public, order, NULL) != 1) { 3721 ret = SSH_ERR_LIBCRYPTO_ERROR; 3722 goto out; 3723 } 3724 if (EC_POINT_is_at_infinity(group, nq) != 1) 3725 goto out; 3726 3727 /* x < order - 1, y < order - 1 */ 3728 if (!BN_sub(tmp, order, BN_value_one())) { 3729 ret = SSH_ERR_LIBCRYPTO_ERROR; 3730 goto out; 3731 } 3732 if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0) 3733 goto out; 3734 ret = 0; 3735 out: 3736 BN_clear_free(x); 3737 BN_clear_free(y); 3738 BN_clear_free(order); 3739 BN_clear_free(tmp); 3740 EC_POINT_free(nq); 3741 return ret; 3742 } 3743 3744 int 3745 sshkey_ec_validate_private(const EC_KEY *key) 3746 { 3747 BIGNUM *order = NULL, *tmp = NULL; 3748 int ret = SSH_ERR_KEY_INVALID_EC_VALUE; 3749 3750 if ((order = BN_new()) == NULL || (tmp = BN_new()) == NULL) { 3751 ret = SSH_ERR_ALLOC_FAIL; 3752 goto out; 3753 } 3754 3755 /* log2(private) > log2(order)/2 */ 3756 if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL) != 1) { 3757 ret = SSH_ERR_LIBCRYPTO_ERROR; 3758 goto out; 3759 } 3760 if (BN_num_bits(EC_KEY_get0_private_key(key)) <= 3761 BN_num_bits(order) / 2) 3762 goto out; 3763 3764 /* private < order - 1 */ 3765 if (!BN_sub(tmp, order, BN_value_one())) { 3766 ret = SSH_ERR_LIBCRYPTO_ERROR; 3767 goto out; 3768 } 3769 if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0) 3770 goto out; 3771 ret = 0; 3772 out: 3773 BN_clear_free(order); 3774 BN_clear_free(tmp); 3775 return ret; 3776 } 3777 3778 void 3779 sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point) 3780 { 3781 BIGNUM *x = NULL, *y = NULL; 3782 3783 if (point == NULL) { 3784 fputs("point=(NULL)\n", stderr); 3785 return; 3786 } 3787 if ((x = BN_new()) == NULL || (y = BN_new()) == NULL) { 3788 fprintf(stderr, "%s: BN_new failed\n", __func__); 3789 goto out; 3790 } 3791 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != 3792 NID_X9_62_prime_field) { 3793 fprintf(stderr, "%s: group is not a prime field\n", __func__); 3794 goto out; 3795 } 3796 if (EC_POINT_get_affine_coordinates_GFp(group, point, 3797 x, y, NULL) != 1) { 3798 fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n", 3799 __func__); 3800 goto out; 3801 } 3802 fputs("x=", stderr); 3803 BN_print_fp(stderr, x); 3804 fputs("\ny=", stderr); 3805 BN_print_fp(stderr, y); 3806 fputs("\n", stderr); 3807 out: 3808 BN_clear_free(x); 3809 BN_clear_free(y); 3810 } 3811 3812 void 3813 sshkey_dump_ec_key(const EC_KEY *key) 3814 { 3815 const BIGNUM *exponent; 3816 3817 sshkey_dump_ec_point(EC_KEY_get0_group(key), 3818 EC_KEY_get0_public_key(key)); 3819 fputs("exponent=", stderr); 3820 if ((exponent = EC_KEY_get0_private_key(key)) == NULL) 3821 fputs("(NULL)", stderr); 3822 else 3823 BN_print_fp(stderr, EC_KEY_get0_private_key(key)); 3824 fputs("\n", stderr); 3825 } 3826 #endif /* WITH_OPENSSL */ 3827 3828 static int 3829 sshkey_private_to_blob2(struct sshkey *prv, struct sshbuf *blob, 3830 const char *passphrase, const char *comment, const char *ciphername, 3831 int rounds) 3832 { 3833 u_char *cp, *key = NULL, *pubkeyblob = NULL; 3834 u_char salt[SALT_LEN]; 3835 char *b64 = NULL; 3836 size_t i, pubkeylen, keylen, ivlen, blocksize, authlen; 3837 u_int check; 3838 int r = SSH_ERR_INTERNAL_ERROR; 3839 struct sshcipher_ctx *ciphercontext = NULL; 3840 const struct sshcipher *cipher; 3841 const char *kdfname = KDFNAME; 3842 struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL; 3843 3844 if (rounds <= 0) 3845 rounds = DEFAULT_ROUNDS; 3846 if (passphrase == NULL || !strlen(passphrase)) { 3847 ciphername = "none"; 3848 kdfname = "none"; 3849 } else if (ciphername == NULL) 3850 ciphername = DEFAULT_CIPHERNAME; 3851 if ((cipher = cipher_by_name(ciphername)) == NULL) { 3852 r = SSH_ERR_INVALID_ARGUMENT; 3853 goto out; 3854 } 3855 3856 if ((kdf = sshbuf_new()) == NULL || 3857 (encoded = sshbuf_new()) == NULL || 3858 (encrypted = sshbuf_new()) == NULL) { 3859 r = SSH_ERR_ALLOC_FAIL; 3860 goto out; 3861 } 3862 blocksize = cipher_blocksize(cipher); 3863 keylen = cipher_keylen(cipher); 3864 ivlen = cipher_ivlen(cipher); 3865 authlen = cipher_authlen(cipher); 3866 if ((key = calloc(1, keylen + ivlen)) == NULL) { 3867 r = SSH_ERR_ALLOC_FAIL; 3868 goto out; 3869 } 3870 if (strcmp(kdfname, "bcrypt") == 0) { 3871 arc4random_buf(salt, SALT_LEN); 3872 if (bcrypt_pbkdf(passphrase, strlen(passphrase), 3873 salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) { 3874 r = SSH_ERR_INVALID_ARGUMENT; 3875 goto out; 3876 } 3877 if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 || 3878 (r = sshbuf_put_u32(kdf, rounds)) != 0) 3879 goto out; 3880 } else if (strcmp(kdfname, "none") != 0) { 3881 /* Unsupported KDF type */ 3882 r = SSH_ERR_KEY_UNKNOWN_CIPHER; 3883 goto out; 3884 } 3885 if ((r = cipher_init(&ciphercontext, cipher, key, keylen, 3886 key + keylen, ivlen, 1)) != 0) 3887 goto out; 3888 3889 if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 || 3890 (r = sshbuf_put_cstring(encoded, ciphername)) != 0 || 3891 (r = sshbuf_put_cstring(encoded, kdfname)) != 0 || 3892 (r = sshbuf_put_stringb(encoded, kdf)) != 0 || 3893 (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */ 3894 (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 || 3895 (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0) 3896 goto out; 3897 3898 /* set up the buffer that will be encrypted */ 3899 3900 /* Random check bytes */ 3901 check = arc4random(); 3902 if ((r = sshbuf_put_u32(encrypted, check)) != 0 || 3903 (r = sshbuf_put_u32(encrypted, check)) != 0) 3904 goto out; 3905 3906 /* append private key and comment*/ 3907 if ((r = sshkey_private_serialize_opt(prv, encrypted, 3908 SSHKEY_SERIALIZE_FULL)) != 0 || 3909 (r = sshbuf_put_cstring(encrypted, comment)) != 0) 3910 goto out; 3911 3912 /* padding */ 3913 i = 0; 3914 while (sshbuf_len(encrypted) % blocksize) { 3915 if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0) 3916 goto out; 3917 } 3918 3919 /* length in destination buffer */ 3920 if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0) 3921 goto out; 3922 3923 /* encrypt */ 3924 if ((r = sshbuf_reserve(encoded, 3925 sshbuf_len(encrypted) + authlen, &cp)) != 0) 3926 goto out; 3927 if ((r = cipher_crypt(ciphercontext, 0, cp, 3928 sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0) 3929 goto out; 3930 3931 sshbuf_reset(blob); 3932 3933 /* assemble uuencoded key */ 3934 if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0 || 3935 (r = sshbuf_dtob64(encoded, blob, 1)) != 0 || 3936 (r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0) 3937 goto out; 3938 3939 /* success */ 3940 r = 0; 3941 3942 out: 3943 sshbuf_free(kdf); 3944 sshbuf_free(encoded); 3945 sshbuf_free(encrypted); 3946 cipher_free(ciphercontext); 3947 explicit_bzero(salt, sizeof(salt)); 3948 if (key != NULL) 3949 freezero(key, keylen + ivlen); 3950 if (pubkeyblob != NULL) 3951 freezero(pubkeyblob, pubkeylen); 3952 if (b64 != NULL) 3953 freezero(b64, strlen(b64)); 3954 return r; 3955 } 3956 3957 static int 3958 private2_uudecode(struct sshbuf *blob, struct sshbuf **decodedp) 3959 { 3960 const u_char *cp; 3961 size_t encoded_len; 3962 int r; 3963 u_char last; 3964 struct sshbuf *encoded = NULL, *decoded = NULL; 3965 3966 if (blob == NULL || decodedp == NULL) 3967 return SSH_ERR_INVALID_ARGUMENT; 3968 3969 *decodedp = NULL; 3970 3971 if ((encoded = sshbuf_new()) == NULL || 3972 (decoded = sshbuf_new()) == NULL) { 3973 r = SSH_ERR_ALLOC_FAIL; 3974 goto out; 3975 } 3976 3977 /* check preamble */ 3978 cp = sshbuf_ptr(blob); 3979 encoded_len = sshbuf_len(blob); 3980 if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) || 3981 memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) { 3982 r = SSH_ERR_INVALID_FORMAT; 3983 goto out; 3984 } 3985 cp += MARK_BEGIN_LEN; 3986 encoded_len -= MARK_BEGIN_LEN; 3987 3988 /* Look for end marker, removing whitespace as we go */ 3989 while (encoded_len > 0) { 3990 if (*cp != '\n' && *cp != '\r') { 3991 if ((r = sshbuf_put_u8(encoded, *cp)) != 0) 3992 goto out; 3993 } 3994 last = *cp; 3995 encoded_len--; 3996 cp++; 3997 if (last == '\n') { 3998 if (encoded_len >= MARK_END_LEN && 3999 memcmp(cp, MARK_END, MARK_END_LEN) == 0) { 4000 /* \0 terminate */ 4001 if ((r = sshbuf_put_u8(encoded, 0)) != 0) 4002 goto out; 4003 break; 4004 } 4005 } 4006 } 4007 if (encoded_len == 0) { 4008 r = SSH_ERR_INVALID_FORMAT; 4009 goto out; 4010 } 4011 4012 /* decode base64 */ 4013 if ((r = sshbuf_b64tod(decoded, (const char *)sshbuf_ptr(encoded))) != 0) 4014 goto out; 4015 4016 /* check magic */ 4017 if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) || 4018 memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) { 4019 r = SSH_ERR_INVALID_FORMAT; 4020 goto out; 4021 } 4022 /* success */ 4023 *decodedp = decoded; 4024 decoded = NULL; 4025 r = 0; 4026 out: 4027 sshbuf_free(encoded); 4028 sshbuf_free(decoded); 4029 return r; 4030 } 4031 4032 static int 4033 private2_decrypt(struct sshbuf *decoded, const char *passphrase, 4034 struct sshbuf **decryptedp, struct sshkey **pubkeyp) 4035 { 4036 char *ciphername = NULL, *kdfname = NULL; 4037 const struct sshcipher *cipher = NULL; 4038 int r = SSH_ERR_INTERNAL_ERROR; 4039 size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0; 4040 struct sshbuf *kdf = NULL, *decrypted = NULL; 4041 struct sshcipher_ctx *ciphercontext = NULL; 4042 struct sshkey *pubkey = NULL; 4043 u_char *key = NULL, *salt = NULL, *dp; 4044 u_int blocksize, rounds, nkeys, encrypted_len, check1, check2; 4045 4046 if (decoded == NULL || decryptedp == NULL || pubkeyp == NULL) 4047 return SSH_ERR_INVALID_ARGUMENT; 4048 4049 *decryptedp = NULL; 4050 *pubkeyp = NULL; 4051 4052 if ((decrypted = sshbuf_new()) == NULL) { 4053 r = SSH_ERR_ALLOC_FAIL; 4054 goto out; 4055 } 4056 4057 /* parse public portion of key */ 4058 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 || 4059 (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 || 4060 (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 || 4061 (r = sshbuf_froms(decoded, &kdf)) != 0 || 4062 (r = sshbuf_get_u32(decoded, &nkeys)) != 0) 4063 goto out; 4064 4065 if (nkeys != 1) { 4066 /* XXX only one key supported at present */ 4067 r = SSH_ERR_INVALID_FORMAT; 4068 goto out; 4069 } 4070 4071 if ((r = sshkey_froms(decoded, &pubkey)) != 0 || 4072 (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0) 4073 goto out; 4074 4075 if ((cipher = cipher_by_name(ciphername)) == NULL) { 4076 r = SSH_ERR_KEY_UNKNOWN_CIPHER; 4077 goto out; 4078 } 4079 if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) { 4080 r = SSH_ERR_KEY_UNKNOWN_CIPHER; 4081 goto out; 4082 } 4083 if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) { 4084 r = SSH_ERR_INVALID_FORMAT; 4085 goto out; 4086 } 4087 if ((passphrase == NULL || strlen(passphrase) == 0) && 4088 strcmp(kdfname, "none") != 0) { 4089 /* passphrase required */ 4090 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 4091 goto out; 4092 } 4093 4094 /* check size of encrypted key blob */ 4095 blocksize = cipher_blocksize(cipher); 4096 if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) { 4097 r = SSH_ERR_INVALID_FORMAT; 4098 goto out; 4099 } 4100 4101 /* setup key */ 4102 keylen = cipher_keylen(cipher); 4103 ivlen = cipher_ivlen(cipher); 4104 authlen = cipher_authlen(cipher); 4105 if ((key = calloc(1, keylen + ivlen)) == NULL) { 4106 r = SSH_ERR_ALLOC_FAIL; 4107 goto out; 4108 } 4109 if (strcmp(kdfname, "bcrypt") == 0) { 4110 if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 || 4111 (r = sshbuf_get_u32(kdf, &rounds)) != 0) 4112 goto out; 4113 if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen, 4114 key, keylen + ivlen, rounds) < 0) { 4115 r = SSH_ERR_INVALID_FORMAT; 4116 goto out; 4117 } 4118 } 4119 4120 /* check that an appropriate amount of auth data is present */ 4121 if (sshbuf_len(decoded) < authlen || 4122 sshbuf_len(decoded) - authlen < encrypted_len) { 4123 r = SSH_ERR_INVALID_FORMAT; 4124 goto out; 4125 } 4126 4127 /* decrypt private portion of key */ 4128 if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 || 4129 (r = cipher_init(&ciphercontext, cipher, key, keylen, 4130 key + keylen, ivlen, 0)) != 0) 4131 goto out; 4132 if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded), 4133 encrypted_len, 0, authlen)) != 0) { 4134 /* an integrity error here indicates an incorrect passphrase */ 4135 if (r == SSH_ERR_MAC_INVALID) 4136 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 4137 goto out; 4138 } 4139 if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0) 4140 goto out; 4141 /* there should be no trailing data */ 4142 if (sshbuf_len(decoded) != 0) { 4143 r = SSH_ERR_INVALID_FORMAT; 4144 goto out; 4145 } 4146 4147 /* check check bytes */ 4148 if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 || 4149 (r = sshbuf_get_u32(decrypted, &check2)) != 0) 4150 goto out; 4151 if (check1 != check2) { 4152 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 4153 goto out; 4154 } 4155 /* success */ 4156 *decryptedp = decrypted; 4157 decrypted = NULL; 4158 *pubkeyp = pubkey; 4159 pubkey = NULL; 4160 r = 0; 4161 out: 4162 cipher_free(ciphercontext); 4163 free(ciphername); 4164 free(kdfname); 4165 sshkey_free(pubkey); 4166 if (salt != NULL) { 4167 explicit_bzero(salt, slen); 4168 free(salt); 4169 } 4170 if (key != NULL) { 4171 explicit_bzero(key, keylen + ivlen); 4172 free(key); 4173 } 4174 sshbuf_free(kdf); 4175 sshbuf_free(decrypted); 4176 return r; 4177 } 4178 4179 /* Check deterministic padding after private key */ 4180 static int 4181 private2_check_padding(struct sshbuf *decrypted) 4182 { 4183 u_char pad; 4184 size_t i; 4185 int r = SSH_ERR_INTERNAL_ERROR; 4186 4187 i = 0; 4188 while (sshbuf_len(decrypted)) { 4189 if ((r = sshbuf_get_u8(decrypted, &pad)) != 0) 4190 goto out; 4191 if (pad != (++i & 0xff)) { 4192 r = SSH_ERR_INVALID_FORMAT; 4193 goto out; 4194 } 4195 } 4196 /* success */ 4197 r = 0; 4198 out: 4199 explicit_bzero(&pad, sizeof(pad)); 4200 explicit_bzero(&i, sizeof(i)); 4201 return r; 4202 } 4203 4204 static int 4205 sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase, 4206 struct sshkey **keyp, char **commentp) 4207 { 4208 char *comment = NULL; 4209 int r = SSH_ERR_INTERNAL_ERROR; 4210 struct sshbuf *decoded = NULL, *decrypted = NULL; 4211 struct sshkey *k = NULL, *pubkey = NULL; 4212 4213 if (keyp != NULL) 4214 *keyp = NULL; 4215 if (commentp != NULL) 4216 *commentp = NULL; 4217 4218 /* Undo base64 encoding and decrypt the private section */ 4219 if ((r = private2_uudecode(blob, &decoded)) != 0 || 4220 (r = private2_decrypt(decoded, passphrase, 4221 &decrypted, &pubkey)) != 0) 4222 goto out; 4223 4224 if (type != KEY_UNSPEC && 4225 sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) { 4226 r = SSH_ERR_KEY_TYPE_MISMATCH; 4227 goto out; 4228 } 4229 4230 /* Load the private key and comment */ 4231 if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 || 4232 (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0) 4233 goto out; 4234 4235 /* Check deterministic padding after private section */ 4236 if ((r = private2_check_padding(decrypted)) != 0) 4237 goto out; 4238 4239 /* Check that the public key in the envelope matches the private key */ 4240 if (!sshkey_equal(pubkey, k)) { 4241 r = SSH_ERR_INVALID_FORMAT; 4242 goto out; 4243 } 4244 4245 /* success */ 4246 r = 0; 4247 if (keyp != NULL) { 4248 *keyp = k; 4249 k = NULL; 4250 } 4251 if (commentp != NULL) { 4252 *commentp = comment; 4253 comment = NULL; 4254 } 4255 out: 4256 free(comment); 4257 sshbuf_free(decoded); 4258 sshbuf_free(decrypted); 4259 sshkey_free(k); 4260 sshkey_free(pubkey); 4261 return r; 4262 } 4263 4264 static int 4265 sshkey_parse_private2_pubkey(struct sshbuf *blob, int type, 4266 struct sshkey **keyp) 4267 { 4268 int r = SSH_ERR_INTERNAL_ERROR; 4269 struct sshbuf *decoded = NULL; 4270 struct sshkey *pubkey = NULL; 4271 u_int nkeys = 0; 4272 4273 if (keyp != NULL) 4274 *keyp = NULL; 4275 4276 if ((r = private2_uudecode(blob, &decoded)) != 0) 4277 goto out; 4278 /* parse public key from unencrypted envelope */ 4279 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 || 4280 (r = sshbuf_skip_string(decoded)) != 0 || /* cipher */ 4281 (r = sshbuf_skip_string(decoded)) != 0 || /* KDF alg */ 4282 (r = sshbuf_skip_string(decoded)) != 0 || /* KDF hint */ 4283 (r = sshbuf_get_u32(decoded, &nkeys)) != 0) 4284 goto out; 4285 4286 if (nkeys != 1) { 4287 /* XXX only one key supported at present */ 4288 r = SSH_ERR_INVALID_FORMAT; 4289 goto out; 4290 } 4291 4292 /* Parse the public key */ 4293 if ((r = sshkey_froms(decoded, &pubkey)) != 0) 4294 goto out; 4295 4296 if (type != KEY_UNSPEC && 4297 sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) { 4298 r = SSH_ERR_KEY_TYPE_MISMATCH; 4299 goto out; 4300 } 4301 4302 /* success */ 4303 r = 0; 4304 if (keyp != NULL) { 4305 *keyp = pubkey; 4306 pubkey = NULL; 4307 } 4308 out: 4309 sshbuf_free(decoded); 4310 sshkey_free(pubkey); 4311 return r; 4312 } 4313 4314 #ifdef WITH_OPENSSL 4315 /* convert SSH v2 key to PEM or PKCS#8 format */ 4316 static int 4317 sshkey_private_to_blob_pem_pkcs8(struct sshkey *key, struct sshbuf *buf, 4318 int format, const char *_passphrase, const char *comment) 4319 { 4320 int was_shielded = sshkey_is_shielded(key); 4321 int success, r; 4322 int blen, len = strlen(_passphrase); 4323 u_char *passphrase = (len > 0) ? __UNCONST(_passphrase) : NULL; 4324 const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL; 4325 char *bptr; 4326 BIO *bio = NULL; 4327 struct sshbuf *blob; 4328 EVP_PKEY *pkey = NULL; 4329 4330 if (len > 0 && len <= 4) 4331 return SSH_ERR_PASSPHRASE_TOO_SHORT; 4332 if ((blob = sshbuf_new()) == NULL) 4333 return SSH_ERR_ALLOC_FAIL; 4334 if ((bio = BIO_new(BIO_s_mem())) == NULL) { 4335 r = SSH_ERR_ALLOC_FAIL; 4336 goto out; 4337 } 4338 if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL) { 4339 r = SSH_ERR_ALLOC_FAIL; 4340 goto out; 4341 } 4342 if ((r = sshkey_unshield_private(key)) != 0) 4343 goto out; 4344 4345 switch (key->type) { 4346 case KEY_DSA: 4347 if (format == SSHKEY_PRIVATE_PEM) { 4348 success = PEM_write_bio_DSAPrivateKey(bio, key->dsa, 4349 cipher, passphrase, len, NULL, NULL); 4350 } else { 4351 success = EVP_PKEY_set1_DSA(pkey, key->dsa); 4352 } 4353 break; 4354 case KEY_ECDSA: 4355 if (format == SSHKEY_PRIVATE_PEM) { 4356 success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa, 4357 cipher, passphrase, len, NULL, NULL); 4358 } else { 4359 success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa); 4360 } 4361 break; 4362 case KEY_RSA: 4363 if (format == SSHKEY_PRIVATE_PEM) { 4364 success = PEM_write_bio_RSAPrivateKey(bio, key->rsa, 4365 cipher, passphrase, len, NULL, NULL); 4366 } else { 4367 success = EVP_PKEY_set1_RSA(pkey, key->rsa); 4368 } 4369 break; 4370 default: 4371 success = 0; 4372 break; 4373 } 4374 if (success == 0) { 4375 r = SSH_ERR_LIBCRYPTO_ERROR; 4376 goto out; 4377 } 4378 if (format == SSHKEY_PRIVATE_PKCS8) { 4379 if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher, 4380 passphrase, len, NULL, NULL)) == 0) { 4381 r = SSH_ERR_LIBCRYPTO_ERROR; 4382 goto out; 4383 } 4384 } 4385 if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) { 4386 r = SSH_ERR_INTERNAL_ERROR; 4387 goto out; 4388 } 4389 if ((r = sshbuf_put(blob, bptr, blen)) != 0) 4390 goto out; 4391 r = 0; 4392 out: 4393 if (was_shielded) 4394 r = sshkey_shield_private(key); 4395 if (r == 0) 4396 r = sshbuf_putb(buf, blob); 4397 4398 EVP_PKEY_free(pkey); 4399 sshbuf_free(blob); 4400 BIO_free(bio); 4401 return r; 4402 } 4403 #endif /* WITH_OPENSSL */ 4404 4405 /* Serialise "key" to buffer "blob" */ 4406 int 4407 sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob, 4408 const char *passphrase, const char *comment, 4409 int format, const char *openssh_format_cipher, int openssh_format_rounds) 4410 { 4411 switch (key->type) { 4412 #ifdef WITH_OPENSSL 4413 case KEY_DSA: 4414 case KEY_ECDSA: 4415 case KEY_RSA: 4416 break; /* see below */ 4417 #endif /* WITH_OPENSSL */ 4418 case KEY_ED25519: 4419 case KEY_ED25519_SK: 4420 #ifdef WITH_XMSS 4421 case KEY_XMSS: 4422 #endif /* WITH_XMSS */ 4423 #ifdef WITH_OPENSSL 4424 case KEY_ECDSA_SK: 4425 #endif /* WITH_OPENSSL */ 4426 return sshkey_private_to_blob2(key, blob, passphrase, 4427 comment, openssh_format_cipher, openssh_format_rounds); 4428 default: 4429 return SSH_ERR_KEY_TYPE_UNKNOWN; 4430 } 4431 4432 #ifdef WITH_OPENSSL 4433 switch (format) { 4434 case SSHKEY_PRIVATE_OPENSSH: 4435 return sshkey_private_to_blob2(key, blob, passphrase, 4436 comment, openssh_format_cipher, openssh_format_rounds); 4437 case SSHKEY_PRIVATE_PEM: 4438 case SSHKEY_PRIVATE_PKCS8: 4439 return sshkey_private_to_blob_pem_pkcs8(key, blob, 4440 format, passphrase, comment); 4441 default: 4442 return SSH_ERR_INVALID_ARGUMENT; 4443 } 4444 #endif /* WITH_OPENSSL */ 4445 } 4446 4447 #ifdef WITH_OPENSSL 4448 static int 4449 translate_libcrypto_error(unsigned long pem_err) 4450 { 4451 int pem_reason = ERR_GET_REASON(pem_err); 4452 4453 switch (ERR_GET_LIB(pem_err)) { 4454 case ERR_LIB_PEM: 4455 switch (pem_reason) { 4456 case PEM_R_BAD_PASSWORD_READ: 4457 case PEM_R_PROBLEMS_GETTING_PASSWORD: 4458 case PEM_R_BAD_DECRYPT: 4459 return SSH_ERR_KEY_WRONG_PASSPHRASE; 4460 default: 4461 return SSH_ERR_INVALID_FORMAT; 4462 } 4463 case ERR_LIB_EVP: 4464 switch (pem_reason) { 4465 case EVP_R_BAD_DECRYPT: 4466 return SSH_ERR_KEY_WRONG_PASSPHRASE; 4467 #ifdef EVP_R_BN_DECODE_ERROR 4468 case EVP_R_BN_DECODE_ERROR: 4469 #endif 4470 case EVP_R_DECODE_ERROR: 4471 #ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR 4472 case EVP_R_PRIVATE_KEY_DECODE_ERROR: 4473 #endif 4474 return SSH_ERR_INVALID_FORMAT; 4475 default: 4476 return SSH_ERR_LIBCRYPTO_ERROR; 4477 } 4478 case ERR_LIB_ASN1: 4479 return SSH_ERR_INVALID_FORMAT; 4480 } 4481 return SSH_ERR_LIBCRYPTO_ERROR; 4482 } 4483 4484 static void 4485 clear_libcrypto_errors(void) 4486 { 4487 while (ERR_get_error() != 0) 4488 ; 4489 } 4490 4491 /* 4492 * Translate OpenSSL error codes to determine whether 4493 * passphrase is required/incorrect. 4494 */ 4495 static int 4496 convert_libcrypto_error(void) 4497 { 4498 /* 4499 * Some password errors are reported at the beginning 4500 * of the error queue. 4501 */ 4502 if (translate_libcrypto_error(ERR_peek_error()) == 4503 SSH_ERR_KEY_WRONG_PASSPHRASE) 4504 return SSH_ERR_KEY_WRONG_PASSPHRASE; 4505 return translate_libcrypto_error(ERR_peek_last_error()); 4506 } 4507 4508 #if 0 4509 static int 4510 pem_passphrase_cb(char *buf, int size, int rwflag, void *u) 4511 { 4512 char *p = (char *)u; 4513 size_t len; 4514 4515 if (p == NULL || (len = strlen(p)) == 0) 4516 return -1; 4517 if (size < 0 || len > (size_t)size) 4518 return -1; 4519 memcpy(buf, p, len); 4520 return (int)len; 4521 } 4522 #endif 4523 4524 static int 4525 sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type, 4526 const char *passphrase, struct sshkey **keyp) 4527 { 4528 EVP_PKEY *pk = NULL; 4529 struct sshkey *prv = NULL; 4530 BIO *bio = NULL; 4531 int r; 4532 4533 if (keyp != NULL) 4534 *keyp = NULL; 4535 4536 if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX) 4537 return SSH_ERR_ALLOC_FAIL; 4538 if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) != 4539 (int)sshbuf_len(blob)) { 4540 r = SSH_ERR_ALLOC_FAIL; 4541 goto out; 4542 } 4543 4544 clear_libcrypto_errors(); 4545 if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL, 4546 __UNCONST(passphrase))) == NULL) { 4547 /* 4548 * libcrypto may return various ASN.1 errors when attempting 4549 * to parse a key with an incorrect passphrase. 4550 * Treat all format errors as "incorrect passphrase" if a 4551 * passphrase was supplied. 4552 */ 4553 if (passphrase != NULL && *passphrase != '\0') 4554 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 4555 else 4556 r = convert_libcrypto_error(); 4557 goto out; 4558 } 4559 if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA && 4560 (type == KEY_UNSPEC || type == KEY_RSA)) { 4561 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { 4562 r = SSH_ERR_ALLOC_FAIL; 4563 goto out; 4564 } 4565 prv->rsa = EVP_PKEY_get1_RSA(pk); 4566 prv->type = KEY_RSA; 4567 #ifdef DEBUG_PK 4568 RSA_print_fp(stderr, prv->rsa, 8); 4569 #endif 4570 if (RSA_blinding_on(prv->rsa, NULL) != 1) { 4571 r = SSH_ERR_LIBCRYPTO_ERROR; 4572 goto out; 4573 } 4574 if ((r = check_rsa_length(prv->rsa)) != 0) 4575 goto out; 4576 } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA && 4577 (type == KEY_UNSPEC || type == KEY_DSA)) { 4578 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { 4579 r = SSH_ERR_ALLOC_FAIL; 4580 goto out; 4581 } 4582 prv->dsa = EVP_PKEY_get1_DSA(pk); 4583 prv->type = KEY_DSA; 4584 #ifdef DEBUG_PK 4585 DSA_print_fp(stderr, prv->dsa, 8); 4586 #endif 4587 } else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC && 4588 (type == KEY_UNSPEC || type == KEY_ECDSA)) { 4589 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { 4590 r = SSH_ERR_ALLOC_FAIL; 4591 goto out; 4592 } 4593 prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk); 4594 prv->type = KEY_ECDSA; 4595 prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa); 4596 if (prv->ecdsa_nid == -1 || 4597 sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL || 4598 sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa), 4599 EC_KEY_get0_public_key(prv->ecdsa)) != 0 || 4600 sshkey_ec_validate_private(prv->ecdsa) != 0) { 4601 r = SSH_ERR_INVALID_FORMAT; 4602 goto out; 4603 } 4604 #ifdef DEBUG_PK 4605 if (prv != NULL && prv->ecdsa != NULL) 4606 sshkey_dump_ec_key(prv->ecdsa); 4607 #endif 4608 } else { 4609 r = SSH_ERR_INVALID_FORMAT; 4610 goto out; 4611 } 4612 r = 0; 4613 if (keyp != NULL) { 4614 *keyp = prv; 4615 prv = NULL; 4616 } 4617 out: 4618 BIO_free(bio); 4619 EVP_PKEY_free(pk); 4620 sshkey_free(prv); 4621 return r; 4622 } 4623 #endif /* WITH_OPENSSL */ 4624 4625 int 4626 sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type, 4627 const char *passphrase, struct sshkey **keyp, char **commentp) 4628 { 4629 int r = SSH_ERR_INTERNAL_ERROR; 4630 4631 if (keyp != NULL) 4632 *keyp = NULL; 4633 if (commentp != NULL) 4634 *commentp = NULL; 4635 4636 switch (type) { 4637 case KEY_ED25519: 4638 case KEY_XMSS: 4639 /* No fallback for new-format-only keys */ 4640 return sshkey_parse_private2(blob, type, passphrase, 4641 keyp, commentp); 4642 default: 4643 r = sshkey_parse_private2(blob, type, passphrase, keyp, 4644 commentp); 4645 /* Only fallback to PEM parser if a format error occurred. */ 4646 if (r != SSH_ERR_INVALID_FORMAT) 4647 return r; 4648 #ifdef WITH_OPENSSL 4649 return sshkey_parse_private_pem_fileblob(blob, type, 4650 passphrase, keyp); 4651 #else 4652 return SSH_ERR_INVALID_FORMAT; 4653 #endif /* WITH_OPENSSL */ 4654 } 4655 } 4656 4657 int 4658 sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase, 4659 struct sshkey **keyp, char **commentp) 4660 { 4661 if (keyp != NULL) 4662 *keyp = NULL; 4663 if (commentp != NULL) 4664 *commentp = NULL; 4665 4666 return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC, 4667 passphrase, keyp, commentp); 4668 } 4669 4670 void 4671 sshkey_sig_details_free(struct sshkey_sig_details *details) 4672 { 4673 freezero(details, sizeof(*details)); 4674 } 4675 4676 int 4677 sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, int type, 4678 struct sshkey **pubkeyp) 4679 { 4680 int r = SSH_ERR_INTERNAL_ERROR; 4681 4682 if (pubkeyp != NULL) 4683 *pubkeyp = NULL; 4684 /* only new-format private keys bundle a public key inside */ 4685 if ((r = sshkey_parse_private2_pubkey(blob, type, pubkeyp)) != 0) 4686 return r; 4687 return 0; 4688 } 4689 4690 #ifdef WITH_XMSS 4691 /* 4692 * serialize the key with the current state and forward the state 4693 * maxsign times. 4694 */ 4695 int 4696 sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b, 4697 u_int32_t maxsign, int printerror) 4698 { 4699 int r, rupdate; 4700 4701 if (maxsign == 0 || 4702 sshkey_type_plain(k->type) != KEY_XMSS) 4703 return sshkey_private_serialize_opt(k, b, 4704 SSHKEY_SERIALIZE_DEFAULT); 4705 if ((r = sshkey_xmss_get_state(k, printerror)) != 0 || 4706 (r = sshkey_private_serialize_opt(k, b, 4707 SSHKEY_SERIALIZE_STATE)) != 0 || 4708 (r = sshkey_xmss_forward_state(k, maxsign)) != 0) 4709 goto out; 4710 r = 0; 4711 out: 4712 if ((rupdate = sshkey_xmss_update_state(k, printerror)) != 0) { 4713 if (r == 0) 4714 r = rupdate; 4715 } 4716 return r; 4717 } 4718 4719 u_int32_t 4720 sshkey_signatures_left(const struct sshkey *k) 4721 { 4722 if (sshkey_type_plain(k->type) == KEY_XMSS) 4723 return sshkey_xmss_signatures_left(k); 4724 return 0; 4725 } 4726 4727 int 4728 sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign) 4729 { 4730 if (sshkey_type_plain(k->type) != KEY_XMSS) 4731 return SSH_ERR_INVALID_ARGUMENT; 4732 return sshkey_xmss_enable_maxsign(k, maxsign); 4733 } 4734 4735 int 4736 sshkey_set_filename(struct sshkey *k, const char *filename) 4737 { 4738 if (k == NULL) 4739 return SSH_ERR_INVALID_ARGUMENT; 4740 if (sshkey_type_plain(k->type) != KEY_XMSS) 4741 return 0; 4742 if (filename == NULL) 4743 return SSH_ERR_INVALID_ARGUMENT; 4744 if ((k->xmss_filename = strdup(filename)) == NULL) 4745 return SSH_ERR_ALLOC_FAIL; 4746 return 0; 4747 } 4748 #else 4749 int 4750 sshkey_private_serialize_maxsign(struct sshkey *k, struct sshbuf *b, 4751 u_int32_t maxsign, int printerror) 4752 { 4753 return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT); 4754 } 4755 4756 u_int32_t 4757 sshkey_signatures_left(const struct sshkey *k) 4758 { 4759 return 0; 4760 } 4761 4762 int 4763 sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign) 4764 { 4765 return SSH_ERR_INVALID_ARGUMENT; 4766 } 4767 4768 int 4769 sshkey_set_filename(struct sshkey *k, const char *filename) 4770 { 4771 if (k == NULL) 4772 return SSH_ERR_INVALID_ARGUMENT; 4773 return 0; 4774 } 4775 #endif /* WITH_XMSS */ 4776