1 /* $OpenBSD: sshkey.c,v 1.21 2015/08/19 23:19:01 djm Exp $ */ 2 /* 3 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. 4 * Copyright (c) 2008 Alexander von Gernler. All rights reserved. 5 * Copyright (c) 2010,2011 Damien Miller. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "includes.h" 29 30 #include <sys/param.h> /* MIN MAX */ 31 #include <sys/types.h> 32 #include <netinet/in.h> 33 34 #ifdef WITH_OPENSSL 35 #include <openssl/evp.h> 36 #include <openssl/err.h> 37 #include <openssl/pem.h> 38 #endif 39 40 #include "crypto_api.h" 41 42 #include <errno.h> 43 #include <limits.h> 44 #include <stdio.h> 45 #include <string.h> 46 #include <resolv.h> 47 #ifdef HAVE_UTIL_H 48 #include <util.h> 49 #endif /* HAVE_UTIL_H */ 50 51 #include "ssh2.h" 52 #include "ssherr.h" 53 #include "misc.h" 54 #include "sshbuf.h" 55 #include "rsa.h" 56 #include "cipher.h" 57 #include "digest.h" 58 #define SSHKEY_INTERNAL 59 #include "sshkey.h" 60 #include "match.h" 61 62 /* openssh private key file format */ 63 #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n" 64 #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n" 65 #define MARK_BEGIN_LEN (sizeof(MARK_BEGIN) - 1) 66 #define MARK_END_LEN (sizeof(MARK_END) - 1) 67 #define KDFNAME "bcrypt" 68 #define AUTH_MAGIC "openssh-key-v1" 69 #define SALT_LEN 16 70 #define DEFAULT_CIPHERNAME "aes256-cbc" 71 #define DEFAULT_ROUNDS 16 72 73 /* Version identification string for SSH v1 identity files. */ 74 #define LEGACY_BEGIN "SSH PRIVATE KEY FILE FORMAT 1.1\n" 75 76 static int sshkey_from_blob_internal(struct sshbuf *buf, 77 struct sshkey **keyp, int allow_cert); 78 79 /* Supported key types */ 80 struct keytype { 81 const char *name; 82 const char *shortname; 83 int type; 84 int nid; 85 int cert; 86 }; 87 static const struct keytype keytypes[] = { 88 { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0 }, 89 { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT", 90 KEY_ED25519_CERT, 0, 1 }, 91 #ifdef WITH_OPENSSL 92 { NULL, "RSA1", KEY_RSA1, 0, 0 }, 93 { "ssh-rsa", "RSA", KEY_RSA, 0, 0 }, 94 { "ssh-dss", "DSA", KEY_DSA, 0, 0 }, 95 # ifdef OPENSSL_HAS_ECC 96 { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0 }, 97 { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0 }, 98 # ifdef OPENSSL_HAS_NISTP521 99 { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0 }, 100 # endif /* OPENSSL_HAS_NISTP521 */ 101 # endif /* OPENSSL_HAS_ECC */ 102 { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1 }, 103 { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1 }, 104 # ifdef OPENSSL_HAS_ECC 105 { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT", 106 KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1 }, 107 { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT", 108 KEY_ECDSA_CERT, NID_secp384r1, 1 }, 109 # ifdef OPENSSL_HAS_NISTP521 110 { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT", 111 KEY_ECDSA_CERT, NID_secp521r1, 1 }, 112 # endif /* OPENSSL_HAS_NISTP521 */ 113 # endif /* OPENSSL_HAS_ECC */ 114 #endif /* WITH_OPENSSL */ 115 { NULL, NULL, -1, -1, 0 } 116 }; 117 118 const char * 119 sshkey_type(const struct sshkey *k) 120 { 121 const struct keytype *kt; 122 123 for (kt = keytypes; kt->type != -1; kt++) { 124 if (kt->type == k->type) 125 return kt->shortname; 126 } 127 return "unknown"; 128 } 129 130 static const char * 131 sshkey_ssh_name_from_type_nid(int type, int nid) 132 { 133 const struct keytype *kt; 134 135 for (kt = keytypes; kt->type != -1; kt++) { 136 if (kt->type == type && (kt->nid == 0 || kt->nid == nid)) 137 return kt->name; 138 } 139 return "ssh-unknown"; 140 } 141 142 int 143 sshkey_type_is_cert(int type) 144 { 145 const struct keytype *kt; 146 147 for (kt = keytypes; kt->type != -1; kt++) { 148 if (kt->type == type) 149 return kt->cert; 150 } 151 return 0; 152 } 153 154 const char * 155 sshkey_ssh_name(const struct sshkey *k) 156 { 157 return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid); 158 } 159 160 const char * 161 sshkey_ssh_name_plain(const struct sshkey *k) 162 { 163 return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type), 164 k->ecdsa_nid); 165 } 166 167 int 168 sshkey_type_from_name(const char *name) 169 { 170 const struct keytype *kt; 171 172 for (kt = keytypes; kt->type != -1; kt++) { 173 /* Only allow shortname matches for plain key types */ 174 if ((kt->name != NULL && strcmp(name, kt->name) == 0) || 175 (!kt->cert && strcasecmp(kt->shortname, name) == 0)) 176 return kt->type; 177 } 178 return KEY_UNSPEC; 179 } 180 181 int 182 sshkey_ecdsa_nid_from_name(const char *name) 183 { 184 const struct keytype *kt; 185 186 for (kt = keytypes; kt->type != -1; kt++) { 187 if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT) 188 continue; 189 if (kt->name != NULL && strcmp(name, kt->name) == 0) 190 return kt->nid; 191 } 192 return -1; 193 } 194 195 char * 196 key_alg_list(int certs_only, int plain_only) 197 { 198 char *tmp, *ret = NULL; 199 size_t nlen, rlen = 0; 200 const struct keytype *kt; 201 202 for (kt = keytypes; kt->type != -1; kt++) { 203 if (kt->name == NULL) 204 continue; 205 if ((certs_only && !kt->cert) || (plain_only && kt->cert)) 206 continue; 207 if (ret != NULL) 208 ret[rlen++] = '\n'; 209 nlen = strlen(kt->name); 210 if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) { 211 free(ret); 212 return NULL; 213 } 214 ret = tmp; 215 memcpy(ret + rlen, kt->name, nlen + 1); 216 rlen += nlen; 217 } 218 return ret; 219 } 220 221 int 222 sshkey_names_valid2(const char *names, int allow_wildcard) 223 { 224 char *s, *cp, *p; 225 const struct keytype *kt; 226 int type; 227 228 if (names == NULL || strcmp(names, "") == 0) 229 return 0; 230 if ((s = cp = strdup(names)) == NULL) 231 return 0; 232 for ((p = strsep(&cp, ",")); p && *p != '\0'; 233 (p = strsep(&cp, ","))) { 234 type = sshkey_type_from_name(p); 235 if (type == KEY_RSA1) { 236 free(s); 237 return 0; 238 } 239 if (type == KEY_UNSPEC) { 240 if (allow_wildcard) { 241 /* 242 * Try matching key types against the string. 243 * If any has a positive or negative match then 244 * the component is accepted. 245 */ 246 for (kt = keytypes; kt->type != -1; kt++) { 247 if (kt->type == KEY_RSA1) 248 continue; 249 if (match_pattern_list(kt->name, 250 p, 0) != 0) 251 break; 252 } 253 if (kt->type != -1) 254 continue; 255 } 256 free(s); 257 return 0; 258 } 259 } 260 free(s); 261 return 1; 262 } 263 264 u_int 265 sshkey_size(const struct sshkey *k) 266 { 267 switch (k->type) { 268 #ifdef WITH_OPENSSL 269 case KEY_RSA1: 270 case KEY_RSA: 271 case KEY_RSA_CERT: 272 return BN_num_bits(k->rsa->n); 273 case KEY_DSA: 274 case KEY_DSA_CERT: 275 return BN_num_bits(k->dsa->p); 276 case KEY_ECDSA: 277 case KEY_ECDSA_CERT: 278 return sshkey_curve_nid_to_bits(k->ecdsa_nid); 279 #endif /* WITH_OPENSSL */ 280 case KEY_ED25519: 281 case KEY_ED25519_CERT: 282 return 256; /* XXX */ 283 } 284 return 0; 285 } 286 287 static int 288 sshkey_type_is_valid_ca(int type) 289 { 290 switch (type) { 291 case KEY_RSA: 292 case KEY_DSA: 293 case KEY_ECDSA: 294 case KEY_ED25519: 295 return 1; 296 default: 297 return 0; 298 } 299 } 300 301 int 302 sshkey_is_cert(const struct sshkey *k) 303 { 304 if (k == NULL) 305 return 0; 306 return sshkey_type_is_cert(k->type); 307 } 308 309 /* Return the cert-less equivalent to a certified key type */ 310 int 311 sshkey_type_plain(int type) 312 { 313 switch (type) { 314 case KEY_RSA_CERT: 315 return KEY_RSA; 316 case KEY_DSA_CERT: 317 return KEY_DSA; 318 case KEY_ECDSA_CERT: 319 return KEY_ECDSA; 320 case KEY_ED25519_CERT: 321 return KEY_ED25519; 322 default: 323 return type; 324 } 325 } 326 327 #ifdef WITH_OPENSSL 328 /* XXX: these are really begging for a table-driven approach */ 329 int 330 sshkey_curve_name_to_nid(const char *name) 331 { 332 if (strcmp(name, "nistp256") == 0) 333 return NID_X9_62_prime256v1; 334 else if (strcmp(name, "nistp384") == 0) 335 return NID_secp384r1; 336 # ifdef OPENSSL_HAS_NISTP521 337 else if (strcmp(name, "nistp521") == 0) 338 return NID_secp521r1; 339 # endif /* OPENSSL_HAS_NISTP521 */ 340 else 341 return -1; 342 } 343 344 u_int 345 sshkey_curve_nid_to_bits(int nid) 346 { 347 switch (nid) { 348 case NID_X9_62_prime256v1: 349 return 256; 350 case NID_secp384r1: 351 return 384; 352 # ifdef OPENSSL_HAS_NISTP521 353 case NID_secp521r1: 354 return 521; 355 # endif /* OPENSSL_HAS_NISTP521 */ 356 default: 357 return 0; 358 } 359 } 360 361 int 362 sshkey_ecdsa_bits_to_nid(int bits) 363 { 364 switch (bits) { 365 case 256: 366 return NID_X9_62_prime256v1; 367 case 384: 368 return NID_secp384r1; 369 # ifdef OPENSSL_HAS_NISTP521 370 case 521: 371 return NID_secp521r1; 372 # endif /* OPENSSL_HAS_NISTP521 */ 373 default: 374 return -1; 375 } 376 } 377 378 const char * 379 sshkey_curve_nid_to_name(int nid) 380 { 381 switch (nid) { 382 case NID_X9_62_prime256v1: 383 return "nistp256"; 384 case NID_secp384r1: 385 return "nistp384"; 386 # ifdef OPENSSL_HAS_NISTP521 387 case NID_secp521r1: 388 return "nistp521"; 389 # endif /* OPENSSL_HAS_NISTP521 */ 390 default: 391 return NULL; 392 } 393 } 394 395 int 396 sshkey_ec_nid_to_hash_alg(int nid) 397 { 398 int kbits = sshkey_curve_nid_to_bits(nid); 399 400 if (kbits <= 0) 401 return -1; 402 403 /* RFC5656 section 6.2.1 */ 404 if (kbits <= 256) 405 return SSH_DIGEST_SHA256; 406 else if (kbits <= 384) 407 return SSH_DIGEST_SHA384; 408 else 409 return SSH_DIGEST_SHA512; 410 } 411 #endif /* WITH_OPENSSL */ 412 413 static void 414 cert_free(struct sshkey_cert *cert) 415 { 416 u_int i; 417 418 if (cert == NULL) 419 return; 420 if (cert->certblob != NULL) 421 sshbuf_free(cert->certblob); 422 if (cert->critical != NULL) 423 sshbuf_free(cert->critical); 424 if (cert->extensions != NULL) 425 sshbuf_free(cert->extensions); 426 if (cert->key_id != NULL) 427 free(cert->key_id); 428 for (i = 0; i < cert->nprincipals; i++) 429 free(cert->principals[i]); 430 if (cert->principals != NULL) 431 free(cert->principals); 432 if (cert->signature_key != NULL) 433 sshkey_free(cert->signature_key); 434 explicit_bzero(cert, sizeof(*cert)); 435 free(cert); 436 } 437 438 static struct sshkey_cert * 439 cert_new(void) 440 { 441 struct sshkey_cert *cert; 442 443 if ((cert = calloc(1, sizeof(*cert))) == NULL) 444 return NULL; 445 if ((cert->certblob = sshbuf_new()) == NULL || 446 (cert->critical = sshbuf_new()) == NULL || 447 (cert->extensions = sshbuf_new()) == NULL) { 448 cert_free(cert); 449 return NULL; 450 } 451 cert->key_id = NULL; 452 cert->principals = NULL; 453 cert->signature_key = NULL; 454 return cert; 455 } 456 457 struct sshkey * 458 sshkey_new(int type) 459 { 460 struct sshkey *k; 461 #ifdef WITH_OPENSSL 462 RSA *rsa; 463 DSA *dsa; 464 #endif /* WITH_OPENSSL */ 465 466 if ((k = calloc(1, sizeof(*k))) == NULL) 467 return NULL; 468 k->type = type; 469 k->ecdsa = NULL; 470 k->ecdsa_nid = -1; 471 k->dsa = NULL; 472 k->rsa = NULL; 473 k->cert = NULL; 474 k->ed25519_sk = NULL; 475 k->ed25519_pk = NULL; 476 switch (k->type) { 477 #ifdef WITH_OPENSSL 478 case KEY_RSA1: 479 case KEY_RSA: 480 case KEY_RSA_CERT: 481 if ((rsa = RSA_new()) == NULL || 482 (rsa->n = BN_new()) == NULL || 483 (rsa->e = BN_new()) == NULL) { 484 if (rsa != NULL) 485 RSA_free(rsa); 486 free(k); 487 return NULL; 488 } 489 k->rsa = rsa; 490 break; 491 case KEY_DSA: 492 case KEY_DSA_CERT: 493 if ((dsa = DSA_new()) == NULL || 494 (dsa->p = BN_new()) == NULL || 495 (dsa->q = BN_new()) == NULL || 496 (dsa->g = BN_new()) == NULL || 497 (dsa->pub_key = BN_new()) == NULL) { 498 if (dsa != NULL) 499 DSA_free(dsa); 500 free(k); 501 return NULL; 502 } 503 k->dsa = dsa; 504 break; 505 case KEY_ECDSA: 506 case KEY_ECDSA_CERT: 507 /* Cannot do anything until we know the group */ 508 break; 509 #endif /* WITH_OPENSSL */ 510 case KEY_ED25519: 511 case KEY_ED25519_CERT: 512 /* no need to prealloc */ 513 break; 514 case KEY_UNSPEC: 515 break; 516 default: 517 free(k); 518 return NULL; 519 break; 520 } 521 522 if (sshkey_is_cert(k)) { 523 if ((k->cert = cert_new()) == NULL) { 524 sshkey_free(k); 525 return NULL; 526 } 527 } 528 529 return k; 530 } 531 532 int 533 sshkey_add_private(struct sshkey *k) 534 { 535 switch (k->type) { 536 #ifdef WITH_OPENSSL 537 case KEY_RSA1: 538 case KEY_RSA: 539 case KEY_RSA_CERT: 540 #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL) 541 if (bn_maybe_alloc_failed(k->rsa->d) || 542 bn_maybe_alloc_failed(k->rsa->iqmp) || 543 bn_maybe_alloc_failed(k->rsa->q) || 544 bn_maybe_alloc_failed(k->rsa->p) || 545 bn_maybe_alloc_failed(k->rsa->dmq1) || 546 bn_maybe_alloc_failed(k->rsa->dmp1)) 547 return SSH_ERR_ALLOC_FAIL; 548 break; 549 case KEY_DSA: 550 case KEY_DSA_CERT: 551 if (bn_maybe_alloc_failed(k->dsa->priv_key)) 552 return SSH_ERR_ALLOC_FAIL; 553 break; 554 #undef bn_maybe_alloc_failed 555 case KEY_ECDSA: 556 case KEY_ECDSA_CERT: 557 /* Cannot do anything until we know the group */ 558 break; 559 #endif /* WITH_OPENSSL */ 560 case KEY_ED25519: 561 case KEY_ED25519_CERT: 562 /* no need to prealloc */ 563 break; 564 case KEY_UNSPEC: 565 break; 566 default: 567 return SSH_ERR_INVALID_ARGUMENT; 568 } 569 return 0; 570 } 571 572 struct sshkey * 573 sshkey_new_private(int type) 574 { 575 struct sshkey *k = sshkey_new(type); 576 577 if (k == NULL) 578 return NULL; 579 if (sshkey_add_private(k) != 0) { 580 sshkey_free(k); 581 return NULL; 582 } 583 return k; 584 } 585 586 void 587 sshkey_free(struct sshkey *k) 588 { 589 if (k == NULL) 590 return; 591 switch (k->type) { 592 #ifdef WITH_OPENSSL 593 case KEY_RSA1: 594 case KEY_RSA: 595 case KEY_RSA_CERT: 596 if (k->rsa != NULL) 597 RSA_free(k->rsa); 598 k->rsa = NULL; 599 break; 600 case KEY_DSA: 601 case KEY_DSA_CERT: 602 if (k->dsa != NULL) 603 DSA_free(k->dsa); 604 k->dsa = NULL; 605 break; 606 # ifdef OPENSSL_HAS_ECC 607 case KEY_ECDSA: 608 case KEY_ECDSA_CERT: 609 if (k->ecdsa != NULL) 610 EC_KEY_free(k->ecdsa); 611 k->ecdsa = NULL; 612 break; 613 # endif /* OPENSSL_HAS_ECC */ 614 #endif /* WITH_OPENSSL */ 615 case KEY_ED25519: 616 case KEY_ED25519_CERT: 617 if (k->ed25519_pk) { 618 explicit_bzero(k->ed25519_pk, ED25519_PK_SZ); 619 free(k->ed25519_pk); 620 k->ed25519_pk = NULL; 621 } 622 if (k->ed25519_sk) { 623 explicit_bzero(k->ed25519_sk, ED25519_SK_SZ); 624 free(k->ed25519_sk); 625 k->ed25519_sk = NULL; 626 } 627 break; 628 case KEY_UNSPEC: 629 break; 630 default: 631 break; 632 } 633 if (sshkey_is_cert(k)) 634 cert_free(k->cert); 635 explicit_bzero(k, sizeof(*k)); 636 free(k); 637 } 638 639 static int 640 cert_compare(struct sshkey_cert *a, struct sshkey_cert *b) 641 { 642 if (a == NULL && b == NULL) 643 return 1; 644 if (a == NULL || b == NULL) 645 return 0; 646 if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob)) 647 return 0; 648 if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob), 649 sshbuf_len(a->certblob)) != 0) 650 return 0; 651 return 1; 652 } 653 654 /* 655 * Compare public portions of key only, allowing comparisons between 656 * certificates and plain keys too. 657 */ 658 int 659 sshkey_equal_public(const struct sshkey *a, const struct sshkey *b) 660 { 661 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) 662 BN_CTX *bnctx; 663 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */ 664 665 if (a == NULL || b == NULL || 666 sshkey_type_plain(a->type) != sshkey_type_plain(b->type)) 667 return 0; 668 669 switch (a->type) { 670 #ifdef WITH_OPENSSL 671 case KEY_RSA1: 672 case KEY_RSA_CERT: 673 case KEY_RSA: 674 return a->rsa != NULL && b->rsa != NULL && 675 BN_cmp(a->rsa->e, b->rsa->e) == 0 && 676 BN_cmp(a->rsa->n, b->rsa->n) == 0; 677 case KEY_DSA_CERT: 678 case KEY_DSA: 679 return a->dsa != NULL && b->dsa != NULL && 680 BN_cmp(a->dsa->p, b->dsa->p) == 0 && 681 BN_cmp(a->dsa->q, b->dsa->q) == 0 && 682 BN_cmp(a->dsa->g, b->dsa->g) == 0 && 683 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; 684 # ifdef OPENSSL_HAS_ECC 685 case KEY_ECDSA_CERT: 686 case KEY_ECDSA: 687 if (a->ecdsa == NULL || b->ecdsa == NULL || 688 EC_KEY_get0_public_key(a->ecdsa) == NULL || 689 EC_KEY_get0_public_key(b->ecdsa) == NULL) 690 return 0; 691 if ((bnctx = BN_CTX_new()) == NULL) 692 return 0; 693 if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa), 694 EC_KEY_get0_group(b->ecdsa), bnctx) != 0 || 695 EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa), 696 EC_KEY_get0_public_key(a->ecdsa), 697 EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) { 698 BN_CTX_free(bnctx); 699 return 0; 700 } 701 BN_CTX_free(bnctx); 702 return 1; 703 # endif /* OPENSSL_HAS_ECC */ 704 #endif /* WITH_OPENSSL */ 705 case KEY_ED25519: 706 case KEY_ED25519_CERT: 707 return a->ed25519_pk != NULL && b->ed25519_pk != NULL && 708 memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0; 709 default: 710 return 0; 711 } 712 /* NOTREACHED */ 713 } 714 715 int 716 sshkey_equal(const struct sshkey *a, const struct sshkey *b) 717 { 718 if (a == NULL || b == NULL || a->type != b->type) 719 return 0; 720 if (sshkey_is_cert(a)) { 721 if (!cert_compare(a->cert, b->cert)) 722 return 0; 723 } 724 return sshkey_equal_public(a, b); 725 } 726 727 static int 728 to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain) 729 { 730 int type, ret = SSH_ERR_INTERNAL_ERROR; 731 const char *typename; 732 733 if (key == NULL) 734 return SSH_ERR_INVALID_ARGUMENT; 735 736 if (sshkey_is_cert(key)) { 737 if (key->cert == NULL) 738 return SSH_ERR_EXPECTED_CERT; 739 if (sshbuf_len(key->cert->certblob) == 0) 740 return SSH_ERR_KEY_LACKS_CERTBLOB; 741 } 742 type = force_plain ? sshkey_type_plain(key->type) : key->type; 743 typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid); 744 745 switch (type) { 746 #ifdef WITH_OPENSSL 747 case KEY_DSA_CERT: 748 case KEY_ECDSA_CERT: 749 case KEY_RSA_CERT: 750 #endif /* WITH_OPENSSL */ 751 case KEY_ED25519_CERT: 752 /* Use the existing blob */ 753 /* XXX modified flag? */ 754 if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0) 755 return ret; 756 break; 757 #ifdef WITH_OPENSSL 758 case KEY_DSA: 759 if (key->dsa == NULL) 760 return SSH_ERR_INVALID_ARGUMENT; 761 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 762 (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 || 763 (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 || 764 (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 || 765 (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0) 766 return ret; 767 break; 768 # ifdef OPENSSL_HAS_ECC 769 case KEY_ECDSA: 770 if (key->ecdsa == NULL) 771 return SSH_ERR_INVALID_ARGUMENT; 772 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 773 (ret = sshbuf_put_cstring(b, 774 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || 775 (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0) 776 return ret; 777 break; 778 # endif 779 case KEY_RSA: 780 if (key->rsa == NULL) 781 return SSH_ERR_INVALID_ARGUMENT; 782 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 783 (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 || 784 (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0) 785 return ret; 786 break; 787 #endif /* WITH_OPENSSL */ 788 case KEY_ED25519: 789 if (key->ed25519_pk == NULL) 790 return SSH_ERR_INVALID_ARGUMENT; 791 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 792 (ret = sshbuf_put_string(b, 793 key->ed25519_pk, ED25519_PK_SZ)) != 0) 794 return ret; 795 break; 796 default: 797 return SSH_ERR_KEY_TYPE_UNKNOWN; 798 } 799 return 0; 800 } 801 802 int 803 sshkey_putb(const struct sshkey *key, struct sshbuf *b) 804 { 805 return to_blob_buf(key, b, 0); 806 } 807 808 int 809 sshkey_puts(const struct sshkey *key, struct sshbuf *b) 810 { 811 struct sshbuf *tmp; 812 int r; 813 814 if ((tmp = sshbuf_new()) == NULL) 815 return SSH_ERR_ALLOC_FAIL; 816 r = to_blob_buf(key, tmp, 0); 817 if (r == 0) 818 r = sshbuf_put_stringb(b, tmp); 819 sshbuf_free(tmp); 820 return r; 821 } 822 823 int 824 sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b) 825 { 826 return to_blob_buf(key, b, 1); 827 } 828 829 static int 830 to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain) 831 { 832 int ret = SSH_ERR_INTERNAL_ERROR; 833 size_t len; 834 struct sshbuf *b = NULL; 835 836 if (lenp != NULL) 837 *lenp = 0; 838 if (blobp != NULL) 839 *blobp = NULL; 840 if ((b = sshbuf_new()) == NULL) 841 return SSH_ERR_ALLOC_FAIL; 842 if ((ret = to_blob_buf(key, b, force_plain)) != 0) 843 goto out; 844 len = sshbuf_len(b); 845 if (lenp != NULL) 846 *lenp = len; 847 if (blobp != NULL) { 848 if ((*blobp = malloc(len)) == NULL) { 849 ret = SSH_ERR_ALLOC_FAIL; 850 goto out; 851 } 852 memcpy(*blobp, sshbuf_ptr(b), len); 853 } 854 ret = 0; 855 out: 856 sshbuf_free(b); 857 return ret; 858 } 859 860 int 861 sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp) 862 { 863 return to_blob(key, blobp, lenp, 0); 864 } 865 866 int 867 sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp) 868 { 869 return to_blob(key, blobp, lenp, 1); 870 } 871 872 int 873 sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg, 874 u_char **retp, size_t *lenp) 875 { 876 u_char *blob = NULL, *ret = NULL; 877 size_t blob_len = 0; 878 int r = SSH_ERR_INTERNAL_ERROR; 879 880 if (retp != NULL) 881 *retp = NULL; 882 if (lenp != NULL) 883 *lenp = 0; 884 if (ssh_digest_bytes(dgst_alg) == 0) { 885 r = SSH_ERR_INVALID_ARGUMENT; 886 goto out; 887 } 888 889 if (k->type == KEY_RSA1) { 890 #ifdef WITH_OPENSSL 891 int nlen = BN_num_bytes(k->rsa->n); 892 int elen = BN_num_bytes(k->rsa->e); 893 894 blob_len = nlen + elen; 895 if (nlen >= INT_MAX - elen || 896 (blob = malloc(blob_len)) == NULL) { 897 r = SSH_ERR_ALLOC_FAIL; 898 goto out; 899 } 900 BN_bn2bin(k->rsa->n, blob); 901 BN_bn2bin(k->rsa->e, blob + nlen); 902 #endif /* WITH_OPENSSL */ 903 } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0) 904 goto out; 905 if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) { 906 r = SSH_ERR_ALLOC_FAIL; 907 goto out; 908 } 909 if ((r = ssh_digest_memory(dgst_alg, blob, blob_len, 910 ret, SSH_DIGEST_MAX_LENGTH)) != 0) 911 goto out; 912 /* success */ 913 if (retp != NULL) { 914 *retp = ret; 915 ret = NULL; 916 } 917 if (lenp != NULL) 918 *lenp = ssh_digest_bytes(dgst_alg); 919 r = 0; 920 out: 921 free(ret); 922 if (blob != NULL) { 923 explicit_bzero(blob, blob_len); 924 free(blob); 925 } 926 return r; 927 } 928 929 static char * 930 fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len) 931 { 932 char *ret; 933 size_t plen = strlen(alg) + 1; 934 size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1; 935 int r; 936 937 if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL) 938 return NULL; 939 strlcpy(ret, alg, rlen); 940 strlcat(ret, ":", rlen); 941 if (dgst_raw_len == 0) 942 return ret; 943 if ((r = b64_ntop(dgst_raw, dgst_raw_len, 944 ret + plen, rlen - plen)) == -1) { 945 explicit_bzero(ret, rlen); 946 free(ret); 947 return NULL; 948 } 949 /* Trim padding characters from end */ 950 ret[strcspn(ret, "=")] = '\0'; 951 return ret; 952 } 953 954 static char * 955 fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len) 956 { 957 char *retval, hex[5]; 958 size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2; 959 960 if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL) 961 return NULL; 962 strlcpy(retval, alg, rlen); 963 strlcat(retval, ":", rlen); 964 for (i = 0; i < dgst_raw_len; i++) { 965 snprintf(hex, sizeof(hex), "%s%02x", 966 i > 0 ? ":" : "", dgst_raw[i]); 967 strlcat(retval, hex, rlen); 968 } 969 return retval; 970 } 971 972 static char * 973 fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len) 974 { 975 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; 976 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', 977 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; 978 u_int i, j = 0, rounds, seed = 1; 979 char *retval; 980 981 rounds = (dgst_raw_len / 2) + 1; 982 if ((retval = calloc(rounds, 6)) == NULL) 983 return NULL; 984 retval[j++] = 'x'; 985 for (i = 0; i < rounds; i++) { 986 u_int idx0, idx1, idx2, idx3, idx4; 987 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { 988 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + 989 seed) % 6; 990 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; 991 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + 992 (seed / 6)) % 6; 993 retval[j++] = vowels[idx0]; 994 retval[j++] = consonants[idx1]; 995 retval[j++] = vowels[idx2]; 996 if ((i + 1) < rounds) { 997 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; 998 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; 999 retval[j++] = consonants[idx3]; 1000 retval[j++] = '-'; 1001 retval[j++] = consonants[idx4]; 1002 seed = ((seed * 5) + 1003 ((((u_int)(dgst_raw[2 * i])) * 7) + 1004 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; 1005 } 1006 } else { 1007 idx0 = seed % 6; 1008 idx1 = 16; 1009 idx2 = seed / 6; 1010 retval[j++] = vowels[idx0]; 1011 retval[j++] = consonants[idx1]; 1012 retval[j++] = vowels[idx2]; 1013 } 1014 } 1015 retval[j++] = 'x'; 1016 retval[j++] = '\0'; 1017 return retval; 1018 } 1019 1020 /* 1021 * Draw an ASCII-Art representing the fingerprint so human brain can 1022 * profit from its built-in pattern recognition ability. 1023 * This technique is called "random art" and can be found in some 1024 * scientific publications like this original paper: 1025 * 1026 * "Hash Visualization: a New Technique to improve Real-World Security", 1027 * Perrig A. and Song D., 1999, International Workshop on Cryptographic 1028 * Techniques and E-Commerce (CrypTEC '99) 1029 * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf 1030 * 1031 * The subject came up in a talk by Dan Kaminsky, too. 1032 * 1033 * If you see the picture is different, the key is different. 1034 * If the picture looks the same, you still know nothing. 1035 * 1036 * The algorithm used here is a worm crawling over a discrete plane, 1037 * leaving a trace (augmenting the field) everywhere it goes. 1038 * Movement is taken from dgst_raw 2bit-wise. Bumping into walls 1039 * makes the respective movement vector be ignored for this turn. 1040 * Graphs are not unambiguous, because circles in graphs can be 1041 * walked in either direction. 1042 */ 1043 1044 /* 1045 * Field sizes for the random art. Have to be odd, so the starting point 1046 * can be in the exact middle of the picture, and FLDBASE should be >=8 . 1047 * Else pictures would be too dense, and drawing the frame would 1048 * fail, too, because the key type would not fit in anymore. 1049 */ 1050 #define FLDBASE 8 1051 #define FLDSIZE_Y (FLDBASE + 1) 1052 #define FLDSIZE_X (FLDBASE * 2 + 1) 1053 static char * 1054 fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len, 1055 const struct sshkey *k) 1056 { 1057 /* 1058 * Chars to be used after each other every time the worm 1059 * intersects with itself. Matter of taste. 1060 */ 1061 char *augmentation_string = " .o+=*BOX@%&#/^SE"; 1062 char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X]; 1063 u_char field[FLDSIZE_X][FLDSIZE_Y]; 1064 size_t i, tlen, hlen; 1065 u_int b; 1066 int x, y, r; 1067 size_t len = strlen(augmentation_string) - 1; 1068 1069 if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL) 1070 return NULL; 1071 1072 /* initialize field */ 1073 memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char)); 1074 x = FLDSIZE_X / 2; 1075 y = FLDSIZE_Y / 2; 1076 1077 /* process raw key */ 1078 for (i = 0; i < dgst_raw_len; i++) { 1079 int input; 1080 /* each byte conveys four 2-bit move commands */ 1081 input = dgst_raw[i]; 1082 for (b = 0; b < 4; b++) { 1083 /* evaluate 2 bit, rest is shifted later */ 1084 x += (input & 0x1) ? 1 : -1; 1085 y += (input & 0x2) ? 1 : -1; 1086 1087 /* assure we are still in bounds */ 1088 x = MAX(x, 0); 1089 y = MAX(y, 0); 1090 x = MIN(x, FLDSIZE_X - 1); 1091 y = MIN(y, FLDSIZE_Y - 1); 1092 1093 /* augment the field */ 1094 if (field[x][y] < len - 2) 1095 field[x][y]++; 1096 input = input >> 2; 1097 } 1098 } 1099 1100 /* mark starting point and end point*/ 1101 field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1; 1102 field[x][y] = len; 1103 1104 /* assemble title */ 1105 r = snprintf(title, sizeof(title), "[%s %u]", 1106 sshkey_type(k), sshkey_size(k)); 1107 /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */ 1108 if (r < 0 || r > (int)sizeof(title)) 1109 r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k)); 1110 tlen = (r <= 0) ? 0 : strlen(title); 1111 1112 /* assemble hash ID. */ 1113 r = snprintf(hash, sizeof(hash), "[%s]", alg); 1114 hlen = (r <= 0) ? 0 : strlen(hash); 1115 1116 /* output upper border */ 1117 p = retval; 1118 *p++ = '+'; 1119 for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++) 1120 *p++ = '-'; 1121 memcpy(p, title, tlen); 1122 p += tlen; 1123 for (i += tlen; i < FLDSIZE_X; i++) 1124 *p++ = '-'; 1125 *p++ = '+'; 1126 *p++ = '\n'; 1127 1128 /* output content */ 1129 for (y = 0; y < FLDSIZE_Y; y++) { 1130 *p++ = '|'; 1131 for (x = 0; x < FLDSIZE_X; x++) 1132 *p++ = augmentation_string[MIN(field[x][y], len)]; 1133 *p++ = '|'; 1134 *p++ = '\n'; 1135 } 1136 1137 /* output lower border */ 1138 *p++ = '+'; 1139 for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++) 1140 *p++ = '-'; 1141 memcpy(p, hash, hlen); 1142 p += hlen; 1143 for (i += hlen; i < FLDSIZE_X; i++) 1144 *p++ = '-'; 1145 *p++ = '+'; 1146 1147 return retval; 1148 } 1149 1150 char * 1151 sshkey_fingerprint(const struct sshkey *k, int dgst_alg, 1152 enum sshkey_fp_rep dgst_rep) 1153 { 1154 char *retval = NULL; 1155 u_char *dgst_raw; 1156 size_t dgst_raw_len; 1157 1158 if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0) 1159 return NULL; 1160 switch (dgst_rep) { 1161 case SSH_FP_DEFAULT: 1162 if (dgst_alg == SSH_DIGEST_MD5) { 1163 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg), 1164 dgst_raw, dgst_raw_len); 1165 } else { 1166 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg), 1167 dgst_raw, dgst_raw_len); 1168 } 1169 break; 1170 case SSH_FP_HEX: 1171 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg), 1172 dgst_raw, dgst_raw_len); 1173 break; 1174 case SSH_FP_BASE64: 1175 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg), 1176 dgst_raw, dgst_raw_len); 1177 break; 1178 case SSH_FP_BUBBLEBABBLE: 1179 retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len); 1180 break; 1181 case SSH_FP_RANDOMART: 1182 retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg), 1183 dgst_raw, dgst_raw_len, k); 1184 break; 1185 default: 1186 explicit_bzero(dgst_raw, dgst_raw_len); 1187 free(dgst_raw); 1188 return NULL; 1189 } 1190 explicit_bzero(dgst_raw, dgst_raw_len); 1191 free(dgst_raw); 1192 return retval; 1193 } 1194 1195 #ifdef WITH_SSH1 1196 /* 1197 * Reads a multiple-precision integer in decimal from the buffer, and advances 1198 * the pointer. The integer must already be initialized. This function is 1199 * permitted to modify the buffer. This leaves *cpp to point just beyond the 1200 * last processed character. 1201 */ 1202 static int 1203 read_decimal_bignum(char **cpp, BIGNUM *v) 1204 { 1205 char *cp; 1206 size_t e; 1207 int skip = 1; /* skip white space */ 1208 1209 cp = *cpp; 1210 while (*cp == ' ' || *cp == '\t') 1211 cp++; 1212 e = strspn(cp, "0123456789"); 1213 if (e == 0) 1214 return SSH_ERR_INVALID_FORMAT; 1215 if (e > SSHBUF_MAX_BIGNUM * 3) 1216 return SSH_ERR_BIGNUM_TOO_LARGE; 1217 if (cp[e] == '\0') 1218 skip = 0; 1219 else if (index(" \t\r\n", cp[e]) == NULL) 1220 return SSH_ERR_INVALID_FORMAT; 1221 cp[e] = '\0'; 1222 if (BN_dec2bn(&v, cp) <= 0) 1223 return SSH_ERR_INVALID_FORMAT; 1224 *cpp = cp + e + skip; 1225 return 0; 1226 } 1227 #endif /* WITH_SSH1 */ 1228 1229 /* returns 0 ok, and < 0 error */ 1230 int 1231 sshkey_read(struct sshkey *ret, char **cpp) 1232 { 1233 struct sshkey *k; 1234 int retval = SSH_ERR_INVALID_FORMAT; 1235 char *cp, *space; 1236 int r, type, curve_nid = -1; 1237 struct sshbuf *blob; 1238 #ifdef WITH_SSH1 1239 char *ep; 1240 u_long bits; 1241 #endif /* WITH_SSH1 */ 1242 1243 cp = *cpp; 1244 1245 switch (ret->type) { 1246 case KEY_RSA1: 1247 #ifdef WITH_SSH1 1248 /* Get number of bits. */ 1249 bits = strtoul(cp, &ep, 10); 1250 if (*cp == '\0' || index(" \t\r\n", *ep) == NULL || 1251 bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8) 1252 return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */ 1253 /* Get public exponent, public modulus. */ 1254 if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0) 1255 return r; 1256 if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0) 1257 return r; 1258 *cpp = ep; 1259 /* validate the claimed number of bits */ 1260 if (BN_num_bits(ret->rsa->n) != (int)bits) 1261 return SSH_ERR_KEY_BITS_MISMATCH; 1262 retval = 0; 1263 #endif /* WITH_SSH1 */ 1264 break; 1265 case KEY_UNSPEC: 1266 case KEY_RSA: 1267 case KEY_DSA: 1268 case KEY_ECDSA: 1269 case KEY_ED25519: 1270 case KEY_DSA_CERT: 1271 case KEY_ECDSA_CERT: 1272 case KEY_RSA_CERT: 1273 case KEY_ED25519_CERT: 1274 space = strchr(cp, ' '); 1275 if (space == NULL) 1276 return SSH_ERR_INVALID_FORMAT; 1277 *space = '\0'; 1278 type = sshkey_type_from_name(cp); 1279 if (sshkey_type_plain(type) == KEY_ECDSA && 1280 (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1) 1281 return SSH_ERR_EC_CURVE_INVALID; 1282 *space = ' '; 1283 if (type == KEY_UNSPEC) 1284 return SSH_ERR_INVALID_FORMAT; 1285 cp = space+1; 1286 if (*cp == '\0') 1287 return SSH_ERR_INVALID_FORMAT; 1288 if (ret->type != KEY_UNSPEC && ret->type != type) 1289 return SSH_ERR_KEY_TYPE_MISMATCH; 1290 if ((blob = sshbuf_new()) == NULL) 1291 return SSH_ERR_ALLOC_FAIL; 1292 /* trim comment */ 1293 space = strchr(cp, ' '); 1294 if (space) { 1295 /* advance 'space': skip whitespace */ 1296 *space++ = '\0'; 1297 while (*space == ' ' || *space == '\t') 1298 space++; 1299 *cpp = space; 1300 } else 1301 *cpp = cp + strlen(cp); 1302 if ((r = sshbuf_b64tod(blob, cp)) != 0) { 1303 sshbuf_free(blob); 1304 return r; 1305 } 1306 if ((r = sshkey_from_blob(sshbuf_ptr(blob), 1307 sshbuf_len(blob), &k)) != 0) { 1308 sshbuf_free(blob); 1309 return r; 1310 } 1311 sshbuf_free(blob); 1312 if (k->type != type) { 1313 sshkey_free(k); 1314 return SSH_ERR_KEY_TYPE_MISMATCH; 1315 } 1316 if (sshkey_type_plain(type) == KEY_ECDSA && 1317 curve_nid != k->ecdsa_nid) { 1318 sshkey_free(k); 1319 return SSH_ERR_EC_CURVE_MISMATCH; 1320 } 1321 ret->type = type; 1322 if (sshkey_is_cert(ret)) { 1323 if (!sshkey_is_cert(k)) { 1324 sshkey_free(k); 1325 return SSH_ERR_EXPECTED_CERT; 1326 } 1327 if (ret->cert != NULL) 1328 cert_free(ret->cert); 1329 ret->cert = k->cert; 1330 k->cert = NULL; 1331 } 1332 #ifdef WITH_OPENSSL 1333 if (sshkey_type_plain(ret->type) == KEY_RSA) { 1334 if (ret->rsa != NULL) 1335 RSA_free(ret->rsa); 1336 ret->rsa = k->rsa; 1337 k->rsa = NULL; 1338 #ifdef DEBUG_PK 1339 RSA_print_fp(stderr, ret->rsa, 8); 1340 #endif 1341 } 1342 if (sshkey_type_plain(ret->type) == KEY_DSA) { 1343 if (ret->dsa != NULL) 1344 DSA_free(ret->dsa); 1345 ret->dsa = k->dsa; 1346 k->dsa = NULL; 1347 #ifdef DEBUG_PK 1348 DSA_print_fp(stderr, ret->dsa, 8); 1349 #endif 1350 } 1351 # ifdef OPENSSL_HAS_ECC 1352 if (sshkey_type_plain(ret->type) == KEY_ECDSA) { 1353 if (ret->ecdsa != NULL) 1354 EC_KEY_free(ret->ecdsa); 1355 ret->ecdsa = k->ecdsa; 1356 ret->ecdsa_nid = k->ecdsa_nid; 1357 k->ecdsa = NULL; 1358 k->ecdsa_nid = -1; 1359 #ifdef DEBUG_PK 1360 sshkey_dump_ec_key(ret->ecdsa); 1361 #endif 1362 } 1363 # endif /* OPENSSL_HAS_ECC */ 1364 #endif /* WITH_OPENSSL */ 1365 if (sshkey_type_plain(ret->type) == KEY_ED25519) { 1366 free(ret->ed25519_pk); 1367 ret->ed25519_pk = k->ed25519_pk; 1368 k->ed25519_pk = NULL; 1369 #ifdef DEBUG_PK 1370 /* XXX */ 1371 #endif 1372 } 1373 retval = 0; 1374 /*XXXX*/ 1375 sshkey_free(k); 1376 if (retval != 0) 1377 break; 1378 break; 1379 default: 1380 return SSH_ERR_INVALID_ARGUMENT; 1381 } 1382 return retval; 1383 } 1384 1385 int 1386 sshkey_to_base64(const struct sshkey *key, char **b64p) 1387 { 1388 int r = SSH_ERR_INTERNAL_ERROR; 1389 struct sshbuf *b = NULL; 1390 char *uu = NULL; 1391 1392 if (b64p != NULL) 1393 *b64p = NULL; 1394 if ((b = sshbuf_new()) == NULL) 1395 return SSH_ERR_ALLOC_FAIL; 1396 if ((r = sshkey_putb(key, b)) != 0) 1397 goto out; 1398 if ((uu = sshbuf_dtob64(b)) == NULL) { 1399 r = SSH_ERR_ALLOC_FAIL; 1400 goto out; 1401 } 1402 /* Success */ 1403 if (b64p != NULL) { 1404 *b64p = uu; 1405 uu = NULL; 1406 } 1407 r = 0; 1408 out: 1409 sshbuf_free(b); 1410 free(uu); 1411 return r; 1412 } 1413 1414 static int 1415 sshkey_format_rsa1(const struct sshkey *key, struct sshbuf *b) 1416 { 1417 int r = SSH_ERR_INTERNAL_ERROR; 1418 #ifdef WITH_SSH1 1419 u_int bits = 0; 1420 char *dec_e = NULL, *dec_n = NULL; 1421 1422 if (key->rsa == NULL || key->rsa->e == NULL || 1423 key->rsa->n == NULL) { 1424 r = SSH_ERR_INVALID_ARGUMENT; 1425 goto out; 1426 } 1427 if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL || 1428 (dec_n = BN_bn2dec(key->rsa->n)) == NULL) { 1429 r = SSH_ERR_ALLOC_FAIL; 1430 goto out; 1431 } 1432 /* size of modulus 'n' */ 1433 if ((bits = BN_num_bits(key->rsa->n)) <= 0) { 1434 r = SSH_ERR_INVALID_ARGUMENT; 1435 goto out; 1436 } 1437 if ((r = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0) 1438 goto out; 1439 1440 /* Success */ 1441 r = 0; 1442 out: 1443 if (dec_e != NULL) 1444 OPENSSL_free(dec_e); 1445 if (dec_n != NULL) 1446 OPENSSL_free(dec_n); 1447 #endif /* WITH_SSH1 */ 1448 1449 return r; 1450 } 1451 1452 static int 1453 sshkey_format_text(const struct sshkey *key, struct sshbuf *b) 1454 { 1455 int r = SSH_ERR_INTERNAL_ERROR; 1456 char *uu = NULL; 1457 1458 if (key->type == KEY_RSA1) { 1459 if ((r = sshkey_format_rsa1(key, b)) != 0) 1460 goto out; 1461 } else { 1462 /* Unsupported key types handled in sshkey_to_base64() */ 1463 if ((r = sshkey_to_base64(key, &uu)) != 0) 1464 goto out; 1465 if ((r = sshbuf_putf(b, "%s %s", 1466 sshkey_ssh_name(key), uu)) != 0) 1467 goto out; 1468 } 1469 r = 0; 1470 out: 1471 free(uu); 1472 return r; 1473 } 1474 1475 int 1476 sshkey_write(const struct sshkey *key, FILE *f) 1477 { 1478 struct sshbuf *b = NULL; 1479 int r = SSH_ERR_INTERNAL_ERROR; 1480 1481 if ((b = sshbuf_new()) == NULL) 1482 return SSH_ERR_ALLOC_FAIL; 1483 if ((r = sshkey_format_text(key, b)) != 0) 1484 goto out; 1485 if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) { 1486 if (feof(f)) 1487 errno = EPIPE; 1488 r = SSH_ERR_SYSTEM_ERROR; 1489 goto out; 1490 } 1491 /* Success */ 1492 r = 0; 1493 out: 1494 sshbuf_free(b); 1495 return r; 1496 } 1497 1498 const char * 1499 sshkey_cert_type(const struct sshkey *k) 1500 { 1501 switch (k->cert->type) { 1502 case SSH2_CERT_TYPE_USER: 1503 return "user"; 1504 case SSH2_CERT_TYPE_HOST: 1505 return "host"; 1506 default: 1507 return "unknown"; 1508 } 1509 } 1510 1511 #ifdef WITH_OPENSSL 1512 static int 1513 rsa_generate_private_key(u_int bits, RSA **rsap) 1514 { 1515 RSA *private = NULL; 1516 BIGNUM *f4 = NULL; 1517 int ret = SSH_ERR_INTERNAL_ERROR; 1518 1519 if (rsap == NULL || 1520 bits < SSH_RSA_MINIMUM_MODULUS_SIZE || 1521 bits > SSHBUF_MAX_BIGNUM * 8) 1522 return SSH_ERR_INVALID_ARGUMENT; 1523 *rsap = NULL; 1524 if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) { 1525 ret = SSH_ERR_ALLOC_FAIL; 1526 goto out; 1527 } 1528 if (!BN_set_word(f4, RSA_F4) || 1529 !RSA_generate_key_ex(private, bits, f4, NULL)) { 1530 ret = SSH_ERR_LIBCRYPTO_ERROR; 1531 goto out; 1532 } 1533 *rsap = private; 1534 private = NULL; 1535 ret = 0; 1536 out: 1537 if (private != NULL) 1538 RSA_free(private); 1539 if (f4 != NULL) 1540 BN_free(f4); 1541 return ret; 1542 } 1543 1544 static int 1545 dsa_generate_private_key(u_int bits, DSA **dsap) 1546 { 1547 DSA *private; 1548 int ret = SSH_ERR_INTERNAL_ERROR; 1549 1550 if (dsap == NULL || bits != 1024) 1551 return SSH_ERR_INVALID_ARGUMENT; 1552 if ((private = DSA_new()) == NULL) { 1553 ret = SSH_ERR_ALLOC_FAIL; 1554 goto out; 1555 } 1556 *dsap = NULL; 1557 if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL, 1558 NULL, NULL) || !DSA_generate_key(private)) { 1559 ret = SSH_ERR_LIBCRYPTO_ERROR; 1560 goto out; 1561 } 1562 *dsap = private; 1563 private = NULL; 1564 ret = 0; 1565 out: 1566 if (private != NULL) 1567 DSA_free(private); 1568 return ret; 1569 } 1570 1571 # ifdef OPENSSL_HAS_ECC 1572 int 1573 sshkey_ecdsa_key_to_nid(EC_KEY *k) 1574 { 1575 EC_GROUP *eg; 1576 int nids[] = { 1577 NID_X9_62_prime256v1, 1578 NID_secp384r1, 1579 # ifdef OPENSSL_HAS_NISTP521 1580 NID_secp521r1, 1581 # endif /* OPENSSL_HAS_NISTP521 */ 1582 -1 1583 }; 1584 int nid; 1585 u_int i; 1586 BN_CTX *bnctx; 1587 const EC_GROUP *g = EC_KEY_get0_group(k); 1588 1589 /* 1590 * The group may be stored in a ASN.1 encoded private key in one of two 1591 * ways: as a "named group", which is reconstituted by ASN.1 object ID 1592 * or explicit group parameters encoded into the key blob. Only the 1593 * "named group" case sets the group NID for us, but we can figure 1594 * it out for the other case by comparing against all the groups that 1595 * are supported. 1596 */ 1597 if ((nid = EC_GROUP_get_curve_name(g)) > 0) 1598 return nid; 1599 if ((bnctx = BN_CTX_new()) == NULL) 1600 return -1; 1601 for (i = 0; nids[i] != -1; i++) { 1602 if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) { 1603 BN_CTX_free(bnctx); 1604 return -1; 1605 } 1606 if (EC_GROUP_cmp(g, eg, bnctx) == 0) 1607 break; 1608 EC_GROUP_free(eg); 1609 } 1610 BN_CTX_free(bnctx); 1611 if (nids[i] != -1) { 1612 /* Use the group with the NID attached */ 1613 EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE); 1614 if (EC_KEY_set_group(k, eg) != 1) { 1615 EC_GROUP_free(eg); 1616 return -1; 1617 } 1618 } 1619 return nids[i]; 1620 } 1621 1622 static int 1623 ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap) 1624 { 1625 EC_KEY *private; 1626 int ret = SSH_ERR_INTERNAL_ERROR; 1627 1628 if (nid == NULL || ecdsap == NULL || 1629 (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1) 1630 return SSH_ERR_INVALID_ARGUMENT; 1631 *ecdsap = NULL; 1632 if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) { 1633 ret = SSH_ERR_ALLOC_FAIL; 1634 goto out; 1635 } 1636 if (EC_KEY_generate_key(private) != 1) { 1637 ret = SSH_ERR_LIBCRYPTO_ERROR; 1638 goto out; 1639 } 1640 EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE); 1641 *ecdsap = private; 1642 private = NULL; 1643 ret = 0; 1644 out: 1645 if (private != NULL) 1646 EC_KEY_free(private); 1647 return ret; 1648 } 1649 # endif /* OPENSSL_HAS_ECC */ 1650 #endif /* WITH_OPENSSL */ 1651 1652 int 1653 sshkey_generate(int type, u_int bits, struct sshkey **keyp) 1654 { 1655 struct sshkey *k; 1656 int ret = SSH_ERR_INTERNAL_ERROR; 1657 1658 if (keyp == NULL) 1659 return SSH_ERR_INVALID_ARGUMENT; 1660 *keyp = NULL; 1661 if ((k = sshkey_new(KEY_UNSPEC)) == NULL) 1662 return SSH_ERR_ALLOC_FAIL; 1663 switch (type) { 1664 case KEY_ED25519: 1665 if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL || 1666 (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) { 1667 ret = SSH_ERR_ALLOC_FAIL; 1668 break; 1669 } 1670 crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk); 1671 ret = 0; 1672 break; 1673 #ifdef WITH_OPENSSL 1674 case KEY_DSA: 1675 ret = dsa_generate_private_key(bits, &k->dsa); 1676 break; 1677 # ifdef OPENSSL_HAS_ECC 1678 case KEY_ECDSA: 1679 ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid, 1680 &k->ecdsa); 1681 break; 1682 # endif /* OPENSSL_HAS_ECC */ 1683 case KEY_RSA: 1684 case KEY_RSA1: 1685 ret = rsa_generate_private_key(bits, &k->rsa); 1686 break; 1687 #endif /* WITH_OPENSSL */ 1688 default: 1689 ret = SSH_ERR_INVALID_ARGUMENT; 1690 } 1691 if (ret == 0) { 1692 k->type = type; 1693 *keyp = k; 1694 } else 1695 sshkey_free(k); 1696 return ret; 1697 } 1698 1699 int 1700 sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key) 1701 { 1702 u_int i; 1703 const struct sshkey_cert *from; 1704 struct sshkey_cert *to; 1705 int ret = SSH_ERR_INTERNAL_ERROR; 1706 1707 if (to_key->cert != NULL) { 1708 cert_free(to_key->cert); 1709 to_key->cert = NULL; 1710 } 1711 1712 if ((from = from_key->cert) == NULL) 1713 return SSH_ERR_INVALID_ARGUMENT; 1714 1715 if ((to = to_key->cert = cert_new()) == NULL) 1716 return SSH_ERR_ALLOC_FAIL; 1717 1718 if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 || 1719 (ret = sshbuf_putb(to->critical, from->critical)) != 0 || 1720 (ret = sshbuf_putb(to->extensions, from->extensions) != 0)) 1721 return ret; 1722 1723 to->serial = from->serial; 1724 to->type = from->type; 1725 if (from->key_id == NULL) 1726 to->key_id = NULL; 1727 else if ((to->key_id = strdup(from->key_id)) == NULL) 1728 return SSH_ERR_ALLOC_FAIL; 1729 to->valid_after = from->valid_after; 1730 to->valid_before = from->valid_before; 1731 if (from->signature_key == NULL) 1732 to->signature_key = NULL; 1733 else if ((ret = sshkey_from_private(from->signature_key, 1734 &to->signature_key)) != 0) 1735 return ret; 1736 1737 if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) 1738 return SSH_ERR_INVALID_ARGUMENT; 1739 if (from->nprincipals > 0) { 1740 if ((to->principals = calloc(from->nprincipals, 1741 sizeof(*to->principals))) == NULL) 1742 return SSH_ERR_ALLOC_FAIL; 1743 for (i = 0; i < from->nprincipals; i++) { 1744 to->principals[i] = strdup(from->principals[i]); 1745 if (to->principals[i] == NULL) { 1746 to->nprincipals = i; 1747 return SSH_ERR_ALLOC_FAIL; 1748 } 1749 } 1750 } 1751 to->nprincipals = from->nprincipals; 1752 return 0; 1753 } 1754 1755 int 1756 sshkey_from_private(const struct sshkey *k, struct sshkey **pkp) 1757 { 1758 struct sshkey *n = NULL; 1759 int ret = SSH_ERR_INTERNAL_ERROR; 1760 1761 if (pkp != NULL) 1762 *pkp = NULL; 1763 1764 switch (k->type) { 1765 #ifdef WITH_OPENSSL 1766 case KEY_DSA: 1767 case KEY_DSA_CERT: 1768 if ((n = sshkey_new(k->type)) == NULL) 1769 return SSH_ERR_ALLOC_FAIL; 1770 if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) || 1771 (BN_copy(n->dsa->q, k->dsa->q) == NULL) || 1772 (BN_copy(n->dsa->g, k->dsa->g) == NULL) || 1773 (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) { 1774 sshkey_free(n); 1775 return SSH_ERR_ALLOC_FAIL; 1776 } 1777 break; 1778 # ifdef OPENSSL_HAS_ECC 1779 case KEY_ECDSA: 1780 case KEY_ECDSA_CERT: 1781 if ((n = sshkey_new(k->type)) == NULL) 1782 return SSH_ERR_ALLOC_FAIL; 1783 n->ecdsa_nid = k->ecdsa_nid; 1784 n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); 1785 if (n->ecdsa == NULL) { 1786 sshkey_free(n); 1787 return SSH_ERR_ALLOC_FAIL; 1788 } 1789 if (EC_KEY_set_public_key(n->ecdsa, 1790 EC_KEY_get0_public_key(k->ecdsa)) != 1) { 1791 sshkey_free(n); 1792 return SSH_ERR_LIBCRYPTO_ERROR; 1793 } 1794 break; 1795 # endif /* OPENSSL_HAS_ECC */ 1796 case KEY_RSA: 1797 case KEY_RSA1: 1798 case KEY_RSA_CERT: 1799 if ((n = sshkey_new(k->type)) == NULL) 1800 return SSH_ERR_ALLOC_FAIL; 1801 if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) || 1802 (BN_copy(n->rsa->e, k->rsa->e) == NULL)) { 1803 sshkey_free(n); 1804 return SSH_ERR_ALLOC_FAIL; 1805 } 1806 break; 1807 #endif /* WITH_OPENSSL */ 1808 case KEY_ED25519: 1809 case KEY_ED25519_CERT: 1810 if ((n = sshkey_new(k->type)) == NULL) 1811 return SSH_ERR_ALLOC_FAIL; 1812 if (k->ed25519_pk != NULL) { 1813 if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) { 1814 sshkey_free(n); 1815 return SSH_ERR_ALLOC_FAIL; 1816 } 1817 memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ); 1818 } 1819 break; 1820 default: 1821 return SSH_ERR_KEY_TYPE_UNKNOWN; 1822 } 1823 if (sshkey_is_cert(k)) { 1824 if ((ret = sshkey_cert_copy(k, n)) != 0) { 1825 sshkey_free(n); 1826 return ret; 1827 } 1828 } 1829 *pkp = n; 1830 return 0; 1831 } 1832 1833 static int 1834 cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf) 1835 { 1836 struct sshbuf *principals = NULL, *crit = NULL; 1837 struct sshbuf *exts = NULL, *ca = NULL; 1838 u_char *sig = NULL; 1839 size_t signed_len = 0, slen = 0, kidlen = 0; 1840 int ret = SSH_ERR_INTERNAL_ERROR; 1841 1842 /* Copy the entire key blob for verification and later serialisation */ 1843 if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0) 1844 return ret; 1845 1846 /* Parse body of certificate up to signature */ 1847 if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 || 1848 (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 || 1849 (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 || 1850 (ret = sshbuf_froms(b, &principals)) != 0 || 1851 (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 || 1852 (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 || 1853 (ret = sshbuf_froms(b, &crit)) != 0 || 1854 (ret = sshbuf_froms(b, &exts)) != 0 || 1855 (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 || 1856 (ret = sshbuf_froms(b, &ca)) != 0) { 1857 /* XXX debug print error for ret */ 1858 ret = SSH_ERR_INVALID_FORMAT; 1859 goto out; 1860 } 1861 1862 /* Signature is left in the buffer so we can calculate this length */ 1863 signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b); 1864 1865 if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) { 1866 ret = SSH_ERR_INVALID_FORMAT; 1867 goto out; 1868 } 1869 1870 if (key->cert->type != SSH2_CERT_TYPE_USER && 1871 key->cert->type != SSH2_CERT_TYPE_HOST) { 1872 ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE; 1873 goto out; 1874 } 1875 1876 /* Parse principals section */ 1877 while (sshbuf_len(principals) > 0) { 1878 char *principal = NULL; 1879 char **oprincipals = NULL; 1880 1881 if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) { 1882 ret = SSH_ERR_INVALID_FORMAT; 1883 goto out; 1884 } 1885 if ((ret = sshbuf_get_cstring(principals, &principal, 1886 NULL)) != 0) { 1887 ret = SSH_ERR_INVALID_FORMAT; 1888 goto out; 1889 } 1890 oprincipals = key->cert->principals; 1891 key->cert->principals = reallocarray(key->cert->principals, 1892 key->cert->nprincipals + 1, sizeof(*key->cert->principals)); 1893 if (key->cert->principals == NULL) { 1894 free(principal); 1895 key->cert->principals = oprincipals; 1896 ret = SSH_ERR_ALLOC_FAIL; 1897 goto out; 1898 } 1899 key->cert->principals[key->cert->nprincipals++] = principal; 1900 } 1901 1902 /* 1903 * Stash a copies of the critical options and extensions sections 1904 * for later use. 1905 */ 1906 if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 || 1907 (exts != NULL && 1908 (ret = sshbuf_putb(key->cert->extensions, exts)) != 0)) 1909 goto out; 1910 1911 /* 1912 * Validate critical options and extensions sections format. 1913 */ 1914 while (sshbuf_len(crit) != 0) { 1915 if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 || 1916 (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) { 1917 sshbuf_reset(key->cert->critical); 1918 ret = SSH_ERR_INVALID_FORMAT; 1919 goto out; 1920 } 1921 } 1922 while (exts != NULL && sshbuf_len(exts) != 0) { 1923 if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 || 1924 (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) { 1925 sshbuf_reset(key->cert->extensions); 1926 ret = SSH_ERR_INVALID_FORMAT; 1927 goto out; 1928 } 1929 } 1930 1931 /* Parse CA key and check signature */ 1932 if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) { 1933 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 1934 goto out; 1935 } 1936 if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) { 1937 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 1938 goto out; 1939 } 1940 if ((ret = sshkey_verify(key->cert->signature_key, sig, slen, 1941 sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0) 1942 goto out; 1943 1944 /* Success */ 1945 ret = 0; 1946 out: 1947 sshbuf_free(ca); 1948 sshbuf_free(crit); 1949 sshbuf_free(exts); 1950 sshbuf_free(principals); 1951 free(sig); 1952 return ret; 1953 } 1954 1955 static int 1956 sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp, 1957 int allow_cert) 1958 { 1959 int type, ret = SSH_ERR_INTERNAL_ERROR; 1960 char *ktype = NULL, *curve = NULL; 1961 struct sshkey *key = NULL; 1962 size_t len; 1963 u_char *pk = NULL; 1964 struct sshbuf *copy; 1965 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) 1966 EC_POINT *q = NULL; 1967 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */ 1968 1969 #ifdef DEBUG_PK /* XXX */ 1970 sshbuf_dump(b, stderr); 1971 #endif 1972 *keyp = NULL; 1973 if ((copy = sshbuf_fromb(b)) == NULL) { 1974 ret = SSH_ERR_ALLOC_FAIL; 1975 goto out; 1976 } 1977 if (sshbuf_get_cstring(b, &ktype, NULL) != 0) { 1978 ret = SSH_ERR_INVALID_FORMAT; 1979 goto out; 1980 } 1981 1982 type = sshkey_type_from_name(ktype); 1983 if (!allow_cert && sshkey_type_is_cert(type)) { 1984 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 1985 goto out; 1986 } 1987 switch (type) { 1988 #ifdef WITH_OPENSSL 1989 case KEY_RSA_CERT: 1990 /* Skip nonce */ 1991 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 1992 ret = SSH_ERR_INVALID_FORMAT; 1993 goto out; 1994 } 1995 /* FALLTHROUGH */ 1996 case KEY_RSA: 1997 if ((key = sshkey_new(type)) == NULL) { 1998 ret = SSH_ERR_ALLOC_FAIL; 1999 goto out; 2000 } 2001 if (sshbuf_get_bignum2(b, key->rsa->e) != 0 || 2002 sshbuf_get_bignum2(b, key->rsa->n) != 0) { 2003 ret = SSH_ERR_INVALID_FORMAT; 2004 goto out; 2005 } 2006 #ifdef DEBUG_PK 2007 RSA_print_fp(stderr, key->rsa, 8); 2008 #endif 2009 break; 2010 case KEY_DSA_CERT: 2011 /* Skip nonce */ 2012 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 2013 ret = SSH_ERR_INVALID_FORMAT; 2014 goto out; 2015 } 2016 /* FALLTHROUGH */ 2017 case KEY_DSA: 2018 if ((key = sshkey_new(type)) == NULL) { 2019 ret = SSH_ERR_ALLOC_FAIL; 2020 goto out; 2021 } 2022 if (sshbuf_get_bignum2(b, key->dsa->p) != 0 || 2023 sshbuf_get_bignum2(b, key->dsa->q) != 0 || 2024 sshbuf_get_bignum2(b, key->dsa->g) != 0 || 2025 sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) { 2026 ret = SSH_ERR_INVALID_FORMAT; 2027 goto out; 2028 } 2029 #ifdef DEBUG_PK 2030 DSA_print_fp(stderr, key->dsa, 8); 2031 #endif 2032 break; 2033 case KEY_ECDSA_CERT: 2034 /* Skip nonce */ 2035 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 2036 ret = SSH_ERR_INVALID_FORMAT; 2037 goto out; 2038 } 2039 /* FALLTHROUGH */ 2040 # ifdef OPENSSL_HAS_ECC 2041 case KEY_ECDSA: 2042 if ((key = sshkey_new(type)) == NULL) { 2043 ret = SSH_ERR_ALLOC_FAIL; 2044 goto out; 2045 } 2046 key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype); 2047 if (sshbuf_get_cstring(b, &curve, NULL) != 0) { 2048 ret = SSH_ERR_INVALID_FORMAT; 2049 goto out; 2050 } 2051 if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { 2052 ret = SSH_ERR_EC_CURVE_MISMATCH; 2053 goto out; 2054 } 2055 if (key->ecdsa != NULL) 2056 EC_KEY_free(key->ecdsa); 2057 if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid)) 2058 == NULL) { 2059 ret = SSH_ERR_EC_CURVE_INVALID; 2060 goto out; 2061 } 2062 if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) { 2063 ret = SSH_ERR_ALLOC_FAIL; 2064 goto out; 2065 } 2066 if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) { 2067 ret = SSH_ERR_INVALID_FORMAT; 2068 goto out; 2069 } 2070 if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa), 2071 q) != 0) { 2072 ret = SSH_ERR_KEY_INVALID_EC_VALUE; 2073 goto out; 2074 } 2075 if (EC_KEY_set_public_key(key->ecdsa, q) != 1) { 2076 /* XXX assume it is a allocation error */ 2077 ret = SSH_ERR_ALLOC_FAIL; 2078 goto out; 2079 } 2080 #ifdef DEBUG_PK 2081 sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q); 2082 #endif 2083 break; 2084 # endif /* OPENSSL_HAS_ECC */ 2085 #endif /* WITH_OPENSSL */ 2086 case KEY_ED25519_CERT: 2087 /* Skip nonce */ 2088 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 2089 ret = SSH_ERR_INVALID_FORMAT; 2090 goto out; 2091 } 2092 /* FALLTHROUGH */ 2093 case KEY_ED25519: 2094 if ((ret = sshbuf_get_string(b, &pk, &len)) != 0) 2095 goto out; 2096 if (len != ED25519_PK_SZ) { 2097 ret = SSH_ERR_INVALID_FORMAT; 2098 goto out; 2099 } 2100 if ((key = sshkey_new(type)) == NULL) { 2101 ret = SSH_ERR_ALLOC_FAIL; 2102 goto out; 2103 } 2104 key->ed25519_pk = pk; 2105 pk = NULL; 2106 break; 2107 case KEY_UNSPEC: 2108 if ((key = sshkey_new(type)) == NULL) { 2109 ret = SSH_ERR_ALLOC_FAIL; 2110 goto out; 2111 } 2112 break; 2113 default: 2114 ret = SSH_ERR_KEY_TYPE_UNKNOWN; 2115 goto out; 2116 } 2117 2118 /* Parse certificate potion */ 2119 if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0) 2120 goto out; 2121 2122 if (key != NULL && sshbuf_len(b) != 0) { 2123 ret = SSH_ERR_INVALID_FORMAT; 2124 goto out; 2125 } 2126 ret = 0; 2127 *keyp = key; 2128 key = NULL; 2129 out: 2130 sshbuf_free(copy); 2131 sshkey_free(key); 2132 free(ktype); 2133 free(curve); 2134 free(pk); 2135 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) 2136 if (q != NULL) 2137 EC_POINT_free(q); 2138 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */ 2139 return ret; 2140 } 2141 2142 int 2143 sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp) 2144 { 2145 struct sshbuf *b; 2146 int r; 2147 2148 if ((b = sshbuf_from(blob, blen)) == NULL) 2149 return SSH_ERR_ALLOC_FAIL; 2150 r = sshkey_from_blob_internal(b, keyp, 1); 2151 sshbuf_free(b); 2152 return r; 2153 } 2154 2155 int 2156 sshkey_fromb(struct sshbuf *b, struct sshkey **keyp) 2157 { 2158 return sshkey_from_blob_internal(b, keyp, 1); 2159 } 2160 2161 int 2162 sshkey_froms(struct sshbuf *buf, struct sshkey **keyp) 2163 { 2164 struct sshbuf *b; 2165 int r; 2166 2167 if ((r = sshbuf_froms(buf, &b)) != 0) 2168 return r; 2169 r = sshkey_from_blob_internal(b, keyp, 1); 2170 sshbuf_free(b); 2171 return r; 2172 } 2173 2174 int 2175 sshkey_sign(const struct sshkey *key, 2176 u_char **sigp, size_t *lenp, 2177 const u_char *data, size_t datalen, u_int compat) 2178 { 2179 if (sigp != NULL) 2180 *sigp = NULL; 2181 if (lenp != NULL) 2182 *lenp = 0; 2183 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE) 2184 return SSH_ERR_INVALID_ARGUMENT; 2185 switch (key->type) { 2186 #ifdef WITH_OPENSSL 2187 case KEY_DSA_CERT: 2188 case KEY_DSA: 2189 return ssh_dss_sign(key, sigp, lenp, data, datalen, compat); 2190 # ifdef OPENSSL_HAS_ECC 2191 case KEY_ECDSA_CERT: 2192 case KEY_ECDSA: 2193 return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat); 2194 # endif /* OPENSSL_HAS_ECC */ 2195 case KEY_RSA_CERT: 2196 case KEY_RSA: 2197 return ssh_rsa_sign(key, sigp, lenp, data, datalen, compat); 2198 #endif /* WITH_OPENSSL */ 2199 case KEY_ED25519: 2200 case KEY_ED25519_CERT: 2201 return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat); 2202 default: 2203 return SSH_ERR_KEY_TYPE_UNKNOWN; 2204 } 2205 } 2206 2207 /* 2208 * ssh_key_verify returns 0 for a correct signature and < 0 on error. 2209 */ 2210 int 2211 sshkey_verify(const struct sshkey *key, 2212 const u_char *sig, size_t siglen, 2213 const u_char *data, size_t dlen, u_int compat) 2214 { 2215 if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE) 2216 return SSH_ERR_INVALID_ARGUMENT; 2217 switch (key->type) { 2218 #ifdef WITH_OPENSSL 2219 case KEY_DSA_CERT: 2220 case KEY_DSA: 2221 return ssh_dss_verify(key, sig, siglen, data, dlen, compat); 2222 # ifdef OPENSSL_HAS_ECC 2223 case KEY_ECDSA_CERT: 2224 case KEY_ECDSA: 2225 return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat); 2226 # endif /* OPENSSL_HAS_ECC */ 2227 case KEY_RSA_CERT: 2228 case KEY_RSA: 2229 return ssh_rsa_verify(key, sig, siglen, data, dlen, compat); 2230 #endif /* WITH_OPENSSL */ 2231 case KEY_ED25519: 2232 case KEY_ED25519_CERT: 2233 return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat); 2234 default: 2235 return SSH_ERR_KEY_TYPE_UNKNOWN; 2236 } 2237 } 2238 2239 /* Converts a private to a public key */ 2240 int 2241 sshkey_demote(const struct sshkey *k, struct sshkey **dkp) 2242 { 2243 struct sshkey *pk; 2244 int ret = SSH_ERR_INTERNAL_ERROR; 2245 2246 if (dkp != NULL) 2247 *dkp = NULL; 2248 2249 if ((pk = calloc(1, sizeof(*pk))) == NULL) 2250 return SSH_ERR_ALLOC_FAIL; 2251 pk->type = k->type; 2252 pk->flags = k->flags; 2253 pk->ecdsa_nid = k->ecdsa_nid; 2254 pk->dsa = NULL; 2255 pk->ecdsa = NULL; 2256 pk->rsa = NULL; 2257 pk->ed25519_pk = NULL; 2258 pk->ed25519_sk = NULL; 2259 2260 switch (k->type) { 2261 #ifdef WITH_OPENSSL 2262 case KEY_RSA_CERT: 2263 if ((ret = sshkey_cert_copy(k, pk)) != 0) 2264 goto fail; 2265 /* FALLTHROUGH */ 2266 case KEY_RSA1: 2267 case KEY_RSA: 2268 if ((pk->rsa = RSA_new()) == NULL || 2269 (pk->rsa->e = BN_dup(k->rsa->e)) == NULL || 2270 (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) { 2271 ret = SSH_ERR_ALLOC_FAIL; 2272 goto fail; 2273 } 2274 break; 2275 case KEY_DSA_CERT: 2276 if ((ret = sshkey_cert_copy(k, pk)) != 0) 2277 goto fail; 2278 /* FALLTHROUGH */ 2279 case KEY_DSA: 2280 if ((pk->dsa = DSA_new()) == NULL || 2281 (pk->dsa->p = BN_dup(k->dsa->p)) == NULL || 2282 (pk->dsa->q = BN_dup(k->dsa->q)) == NULL || 2283 (pk->dsa->g = BN_dup(k->dsa->g)) == NULL || 2284 (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) { 2285 ret = SSH_ERR_ALLOC_FAIL; 2286 goto fail; 2287 } 2288 break; 2289 case KEY_ECDSA_CERT: 2290 if ((ret = sshkey_cert_copy(k, pk)) != 0) 2291 goto fail; 2292 /* FALLTHROUGH */ 2293 # ifdef OPENSSL_HAS_ECC 2294 case KEY_ECDSA: 2295 pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid); 2296 if (pk->ecdsa == NULL) { 2297 ret = SSH_ERR_ALLOC_FAIL; 2298 goto fail; 2299 } 2300 if (EC_KEY_set_public_key(pk->ecdsa, 2301 EC_KEY_get0_public_key(k->ecdsa)) != 1) { 2302 ret = SSH_ERR_LIBCRYPTO_ERROR; 2303 goto fail; 2304 } 2305 break; 2306 # endif /* OPENSSL_HAS_ECC */ 2307 #endif /* WITH_OPENSSL */ 2308 case KEY_ED25519_CERT: 2309 if ((ret = sshkey_cert_copy(k, pk)) != 0) 2310 goto fail; 2311 /* FALLTHROUGH */ 2312 case KEY_ED25519: 2313 if (k->ed25519_pk != NULL) { 2314 if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) { 2315 ret = SSH_ERR_ALLOC_FAIL; 2316 goto fail; 2317 } 2318 memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ); 2319 } 2320 break; 2321 default: 2322 ret = SSH_ERR_KEY_TYPE_UNKNOWN; 2323 fail: 2324 sshkey_free(pk); 2325 return ret; 2326 } 2327 *dkp = pk; 2328 return 0; 2329 } 2330 2331 /* Convert a plain key to their _CERT equivalent */ 2332 int 2333 sshkey_to_certified(struct sshkey *k) 2334 { 2335 int newtype; 2336 2337 switch (k->type) { 2338 #ifdef WITH_OPENSSL 2339 case KEY_RSA: 2340 newtype = KEY_RSA_CERT; 2341 break; 2342 case KEY_DSA: 2343 newtype = KEY_DSA_CERT; 2344 break; 2345 case KEY_ECDSA: 2346 newtype = KEY_ECDSA_CERT; 2347 break; 2348 #endif /* WITH_OPENSSL */ 2349 case KEY_ED25519: 2350 newtype = KEY_ED25519_CERT; 2351 break; 2352 default: 2353 return SSH_ERR_INVALID_ARGUMENT; 2354 } 2355 if ((k->cert = cert_new()) == NULL) 2356 return SSH_ERR_ALLOC_FAIL; 2357 k->type = newtype; 2358 return 0; 2359 } 2360 2361 /* Convert a certificate to its raw key equivalent */ 2362 int 2363 sshkey_drop_cert(struct sshkey *k) 2364 { 2365 if (!sshkey_type_is_cert(k->type)) 2366 return SSH_ERR_KEY_TYPE_UNKNOWN; 2367 cert_free(k->cert); 2368 k->cert = NULL; 2369 k->type = sshkey_type_plain(k->type); 2370 return 0; 2371 } 2372 2373 /* Sign a certified key, (re-)generating the signed certblob. */ 2374 int 2375 sshkey_certify(struct sshkey *k, struct sshkey *ca) 2376 { 2377 struct sshbuf *principals = NULL; 2378 u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32]; 2379 size_t i, ca_len, sig_len; 2380 int ret = SSH_ERR_INTERNAL_ERROR; 2381 struct sshbuf *cert; 2382 2383 if (k == NULL || k->cert == NULL || 2384 k->cert->certblob == NULL || ca == NULL) 2385 return SSH_ERR_INVALID_ARGUMENT; 2386 if (!sshkey_is_cert(k)) 2387 return SSH_ERR_KEY_TYPE_UNKNOWN; 2388 if (!sshkey_type_is_valid_ca(ca->type)) 2389 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 2390 2391 if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0) 2392 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 2393 2394 cert = k->cert->certblob; /* for readability */ 2395 sshbuf_reset(cert); 2396 if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0) 2397 goto out; 2398 2399 /* -v01 certs put nonce first */ 2400 arc4random_buf(&nonce, sizeof(nonce)); 2401 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0) 2402 goto out; 2403 2404 /* XXX this substantially duplicates to_blob(); refactor */ 2405 switch (k->type) { 2406 #ifdef WITH_OPENSSL 2407 case KEY_DSA_CERT: 2408 if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 || 2409 (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 || 2410 (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 || 2411 (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0) 2412 goto out; 2413 break; 2414 # ifdef OPENSSL_HAS_ECC 2415 case KEY_ECDSA_CERT: 2416 if ((ret = sshbuf_put_cstring(cert, 2417 sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 || 2418 (ret = sshbuf_put_ec(cert, 2419 EC_KEY_get0_public_key(k->ecdsa), 2420 EC_KEY_get0_group(k->ecdsa))) != 0) 2421 goto out; 2422 break; 2423 # endif /* OPENSSL_HAS_ECC */ 2424 case KEY_RSA_CERT: 2425 if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 || 2426 (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0) 2427 goto out; 2428 break; 2429 #endif /* WITH_OPENSSL */ 2430 case KEY_ED25519_CERT: 2431 if ((ret = sshbuf_put_string(cert, 2432 k->ed25519_pk, ED25519_PK_SZ)) != 0) 2433 goto out; 2434 break; 2435 default: 2436 ret = SSH_ERR_INVALID_ARGUMENT; 2437 goto out; 2438 } 2439 2440 if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 || 2441 (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 || 2442 (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0) 2443 goto out; 2444 2445 if ((principals = sshbuf_new()) == NULL) { 2446 ret = SSH_ERR_ALLOC_FAIL; 2447 goto out; 2448 } 2449 for (i = 0; i < k->cert->nprincipals; i++) { 2450 if ((ret = sshbuf_put_cstring(principals, 2451 k->cert->principals[i])) != 0) 2452 goto out; 2453 } 2454 if ((ret = sshbuf_put_stringb(cert, principals)) != 0 || 2455 (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 || 2456 (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 || 2457 (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 || 2458 (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 || 2459 (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */ 2460 (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0) 2461 goto out; 2462 2463 /* Sign the whole mess */ 2464 if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert), 2465 sshbuf_len(cert), 0)) != 0) 2466 goto out; 2467 2468 /* Append signature and we are done */ 2469 if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0) 2470 goto out; 2471 ret = 0; 2472 out: 2473 if (ret != 0) 2474 sshbuf_reset(cert); 2475 if (sig_blob != NULL) 2476 free(sig_blob); 2477 if (ca_blob != NULL) 2478 free(ca_blob); 2479 if (principals != NULL) 2480 sshbuf_free(principals); 2481 return ret; 2482 } 2483 2484 int 2485 sshkey_cert_check_authority(const struct sshkey *k, 2486 int want_host, int require_principal, 2487 const char *name, const char **reason) 2488 { 2489 u_int i, principal_matches; 2490 time_t now = time(NULL); 2491 2492 if (reason != NULL) 2493 *reason = NULL; 2494 2495 if (want_host) { 2496 if (k->cert->type != SSH2_CERT_TYPE_HOST) { 2497 *reason = "Certificate invalid: not a host certificate"; 2498 return SSH_ERR_KEY_CERT_INVALID; 2499 } 2500 } else { 2501 if (k->cert->type != SSH2_CERT_TYPE_USER) { 2502 *reason = "Certificate invalid: not a user certificate"; 2503 return SSH_ERR_KEY_CERT_INVALID; 2504 } 2505 } 2506 if (now < 0) { 2507 /* yikes - system clock before epoch! */ 2508 *reason = "Certificate invalid: not yet valid"; 2509 return SSH_ERR_KEY_CERT_INVALID; 2510 } 2511 if ((u_int64_t)now < k->cert->valid_after) { 2512 *reason = "Certificate invalid: not yet valid"; 2513 return SSH_ERR_KEY_CERT_INVALID; 2514 } 2515 if ((u_int64_t)now >= k->cert->valid_before) { 2516 *reason = "Certificate invalid: expired"; 2517 return SSH_ERR_KEY_CERT_INVALID; 2518 } 2519 if (k->cert->nprincipals == 0) { 2520 if (require_principal) { 2521 *reason = "Certificate lacks principal list"; 2522 return SSH_ERR_KEY_CERT_INVALID; 2523 } 2524 } else if (name != NULL) { 2525 principal_matches = 0; 2526 for (i = 0; i < k->cert->nprincipals; i++) { 2527 if (strcmp(name, k->cert->principals[i]) == 0) { 2528 principal_matches = 1; 2529 break; 2530 } 2531 } 2532 if (!principal_matches) { 2533 *reason = "Certificate invalid: name is not a listed " 2534 "principal"; 2535 return SSH_ERR_KEY_CERT_INVALID; 2536 } 2537 } 2538 return 0; 2539 } 2540 2541 int 2542 sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b) 2543 { 2544 int r = SSH_ERR_INTERNAL_ERROR; 2545 2546 if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0) 2547 goto out; 2548 switch (key->type) { 2549 #ifdef WITH_OPENSSL 2550 case KEY_RSA: 2551 if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 || 2552 (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 || 2553 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 || 2554 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 || 2555 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 || 2556 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0) 2557 goto out; 2558 break; 2559 case KEY_RSA_CERT: 2560 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 2561 r = SSH_ERR_INVALID_ARGUMENT; 2562 goto out; 2563 } 2564 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 2565 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 || 2566 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 || 2567 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 || 2568 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0) 2569 goto out; 2570 break; 2571 case KEY_DSA: 2572 if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 || 2573 (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 || 2574 (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 || 2575 (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 || 2576 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0) 2577 goto out; 2578 break; 2579 case KEY_DSA_CERT: 2580 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 2581 r = SSH_ERR_INVALID_ARGUMENT; 2582 goto out; 2583 } 2584 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 2585 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0) 2586 goto out; 2587 break; 2588 # ifdef OPENSSL_HAS_ECC 2589 case KEY_ECDSA: 2590 if ((r = sshbuf_put_cstring(b, 2591 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || 2592 (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 || 2593 (r = sshbuf_put_bignum2(b, 2594 EC_KEY_get0_private_key(key->ecdsa))) != 0) 2595 goto out; 2596 break; 2597 case KEY_ECDSA_CERT: 2598 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 2599 r = SSH_ERR_INVALID_ARGUMENT; 2600 goto out; 2601 } 2602 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 2603 (r = sshbuf_put_bignum2(b, 2604 EC_KEY_get0_private_key(key->ecdsa))) != 0) 2605 goto out; 2606 break; 2607 # endif /* OPENSSL_HAS_ECC */ 2608 #endif /* WITH_OPENSSL */ 2609 case KEY_ED25519: 2610 if ((r = sshbuf_put_string(b, key->ed25519_pk, 2611 ED25519_PK_SZ)) != 0 || 2612 (r = sshbuf_put_string(b, key->ed25519_sk, 2613 ED25519_SK_SZ)) != 0) 2614 goto out; 2615 break; 2616 case KEY_ED25519_CERT: 2617 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 2618 r = SSH_ERR_INVALID_ARGUMENT; 2619 goto out; 2620 } 2621 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 2622 (r = sshbuf_put_string(b, key->ed25519_pk, 2623 ED25519_PK_SZ)) != 0 || 2624 (r = sshbuf_put_string(b, key->ed25519_sk, 2625 ED25519_SK_SZ)) != 0) 2626 goto out; 2627 break; 2628 default: 2629 r = SSH_ERR_INVALID_ARGUMENT; 2630 goto out; 2631 } 2632 /* success */ 2633 r = 0; 2634 out: 2635 return r; 2636 } 2637 2638 int 2639 sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp) 2640 { 2641 char *tname = NULL, *curve = NULL; 2642 struct sshkey *k = NULL; 2643 size_t pklen = 0, sklen = 0; 2644 int type, r = SSH_ERR_INTERNAL_ERROR; 2645 u_char *ed25519_pk = NULL, *ed25519_sk = NULL; 2646 #ifdef WITH_OPENSSL 2647 BIGNUM *exponent = NULL; 2648 #endif /* WITH_OPENSSL */ 2649 2650 if (kp != NULL) 2651 *kp = NULL; 2652 if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0) 2653 goto out; 2654 type = sshkey_type_from_name(tname); 2655 switch (type) { 2656 #ifdef WITH_OPENSSL 2657 case KEY_DSA: 2658 if ((k = sshkey_new_private(type)) == NULL) { 2659 r = SSH_ERR_ALLOC_FAIL; 2660 goto out; 2661 } 2662 if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 || 2663 (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 || 2664 (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 || 2665 (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 || 2666 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0) 2667 goto out; 2668 break; 2669 case KEY_DSA_CERT: 2670 if ((r = sshkey_froms(buf, &k)) != 0 || 2671 (r = sshkey_add_private(k)) != 0 || 2672 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0) 2673 goto out; 2674 break; 2675 # ifdef OPENSSL_HAS_ECC 2676 case KEY_ECDSA: 2677 if ((k = sshkey_new_private(type)) == NULL) { 2678 r = SSH_ERR_ALLOC_FAIL; 2679 goto out; 2680 } 2681 if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) { 2682 r = SSH_ERR_INVALID_ARGUMENT; 2683 goto out; 2684 } 2685 if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0) 2686 goto out; 2687 if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { 2688 r = SSH_ERR_EC_CURVE_MISMATCH; 2689 goto out; 2690 } 2691 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); 2692 if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) { 2693 r = SSH_ERR_LIBCRYPTO_ERROR; 2694 goto out; 2695 } 2696 if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 || 2697 (r = sshbuf_get_bignum2(buf, exponent))) 2698 goto out; 2699 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) { 2700 r = SSH_ERR_LIBCRYPTO_ERROR; 2701 goto out; 2702 } 2703 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa), 2704 EC_KEY_get0_public_key(k->ecdsa)) != 0) || 2705 (r = sshkey_ec_validate_private(k->ecdsa)) != 0) 2706 goto out; 2707 break; 2708 case KEY_ECDSA_CERT: 2709 if ((exponent = BN_new()) == NULL) { 2710 r = SSH_ERR_LIBCRYPTO_ERROR; 2711 goto out; 2712 } 2713 if ((r = sshkey_froms(buf, &k)) != 0 || 2714 (r = sshkey_add_private(k)) != 0 || 2715 (r = sshbuf_get_bignum2(buf, exponent)) != 0) 2716 goto out; 2717 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) { 2718 r = SSH_ERR_LIBCRYPTO_ERROR; 2719 goto out; 2720 } 2721 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa), 2722 EC_KEY_get0_public_key(k->ecdsa)) != 0) || 2723 (r = sshkey_ec_validate_private(k->ecdsa)) != 0) 2724 goto out; 2725 break; 2726 # endif /* OPENSSL_HAS_ECC */ 2727 case KEY_RSA: 2728 if ((k = sshkey_new_private(type)) == NULL) { 2729 r = SSH_ERR_ALLOC_FAIL; 2730 goto out; 2731 } 2732 if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 || 2733 (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 || 2734 (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 || 2735 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 || 2736 (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 || 2737 (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 || 2738 (r = rsa_generate_additional_parameters(k->rsa)) != 0) 2739 goto out; 2740 break; 2741 case KEY_RSA_CERT: 2742 if ((r = sshkey_froms(buf, &k)) != 0 || 2743 (r = sshkey_add_private(k)) != 0 || 2744 (r = sshbuf_get_bignum2(buf, k->rsa->d) != 0) || 2745 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp) != 0) || 2746 (r = sshbuf_get_bignum2(buf, k->rsa->p) != 0) || 2747 (r = sshbuf_get_bignum2(buf, k->rsa->q) != 0) || 2748 (r = rsa_generate_additional_parameters(k->rsa)) != 0) 2749 goto out; 2750 break; 2751 #endif /* WITH_OPENSSL */ 2752 case KEY_ED25519: 2753 if ((k = sshkey_new_private(type)) == NULL) { 2754 r = SSH_ERR_ALLOC_FAIL; 2755 goto out; 2756 } 2757 if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 || 2758 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0) 2759 goto out; 2760 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) { 2761 r = SSH_ERR_INVALID_FORMAT; 2762 goto out; 2763 } 2764 k->ed25519_pk = ed25519_pk; 2765 k->ed25519_sk = ed25519_sk; 2766 ed25519_pk = ed25519_sk = NULL; 2767 break; 2768 case KEY_ED25519_CERT: 2769 if ((r = sshkey_froms(buf, &k)) != 0 || 2770 (r = sshkey_add_private(k)) != 0 || 2771 (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 || 2772 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0) 2773 goto out; 2774 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) { 2775 r = SSH_ERR_INVALID_FORMAT; 2776 goto out; 2777 } 2778 k->ed25519_pk = ed25519_pk; 2779 k->ed25519_sk = ed25519_sk; 2780 ed25519_pk = ed25519_sk = NULL; 2781 break; 2782 default: 2783 r = SSH_ERR_KEY_TYPE_UNKNOWN; 2784 goto out; 2785 } 2786 #ifdef WITH_OPENSSL 2787 /* enable blinding */ 2788 switch (k->type) { 2789 case KEY_RSA: 2790 case KEY_RSA_CERT: 2791 case KEY_RSA1: 2792 if (RSA_blinding_on(k->rsa, NULL) != 1) { 2793 r = SSH_ERR_LIBCRYPTO_ERROR; 2794 goto out; 2795 } 2796 break; 2797 } 2798 #endif /* WITH_OPENSSL */ 2799 /* success */ 2800 r = 0; 2801 if (kp != NULL) { 2802 *kp = k; 2803 k = NULL; 2804 } 2805 out: 2806 free(tname); 2807 free(curve); 2808 #ifdef WITH_OPENSSL 2809 if (exponent != NULL) 2810 BN_clear_free(exponent); 2811 #endif /* WITH_OPENSSL */ 2812 sshkey_free(k); 2813 if (ed25519_pk != NULL) { 2814 explicit_bzero(ed25519_pk, pklen); 2815 free(ed25519_pk); 2816 } 2817 if (ed25519_sk != NULL) { 2818 explicit_bzero(ed25519_sk, sklen); 2819 free(ed25519_sk); 2820 } 2821 return r; 2822 } 2823 2824 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) 2825 int 2826 sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public) 2827 { 2828 BN_CTX *bnctx; 2829 EC_POINT *nq = NULL; 2830 BIGNUM *order, *x, *y, *tmp; 2831 int ret = SSH_ERR_KEY_INVALID_EC_VALUE; 2832 2833 if ((bnctx = BN_CTX_new()) == NULL) 2834 return SSH_ERR_ALLOC_FAIL; 2835 BN_CTX_start(bnctx); 2836 2837 /* 2838 * We shouldn't ever hit this case because bignum_get_ecpoint() 2839 * refuses to load GF2m points. 2840 */ 2841 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != 2842 NID_X9_62_prime_field) 2843 goto out; 2844 2845 /* Q != infinity */ 2846 if (EC_POINT_is_at_infinity(group, public)) 2847 goto out; 2848 2849 if ((x = BN_CTX_get(bnctx)) == NULL || 2850 (y = BN_CTX_get(bnctx)) == NULL || 2851 (order = BN_CTX_get(bnctx)) == NULL || 2852 (tmp = BN_CTX_get(bnctx)) == NULL) { 2853 ret = SSH_ERR_ALLOC_FAIL; 2854 goto out; 2855 } 2856 2857 /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */ 2858 if (EC_GROUP_get_order(group, order, bnctx) != 1 || 2859 EC_POINT_get_affine_coordinates_GFp(group, public, 2860 x, y, bnctx) != 1) { 2861 ret = SSH_ERR_LIBCRYPTO_ERROR; 2862 goto out; 2863 } 2864 if (BN_num_bits(x) <= BN_num_bits(order) / 2 || 2865 BN_num_bits(y) <= BN_num_bits(order) / 2) 2866 goto out; 2867 2868 /* nQ == infinity (n == order of subgroup) */ 2869 if ((nq = EC_POINT_new(group)) == NULL) { 2870 ret = SSH_ERR_ALLOC_FAIL; 2871 goto out; 2872 } 2873 if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) { 2874 ret = SSH_ERR_LIBCRYPTO_ERROR; 2875 goto out; 2876 } 2877 if (EC_POINT_is_at_infinity(group, nq) != 1) 2878 goto out; 2879 2880 /* x < order - 1, y < order - 1 */ 2881 if (!BN_sub(tmp, order, BN_value_one())) { 2882 ret = SSH_ERR_LIBCRYPTO_ERROR; 2883 goto out; 2884 } 2885 if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0) 2886 goto out; 2887 ret = 0; 2888 out: 2889 BN_CTX_free(bnctx); 2890 if (nq != NULL) 2891 EC_POINT_free(nq); 2892 return ret; 2893 } 2894 2895 int 2896 sshkey_ec_validate_private(const EC_KEY *key) 2897 { 2898 BN_CTX *bnctx; 2899 BIGNUM *order, *tmp; 2900 int ret = SSH_ERR_KEY_INVALID_EC_VALUE; 2901 2902 if ((bnctx = BN_CTX_new()) == NULL) 2903 return SSH_ERR_ALLOC_FAIL; 2904 BN_CTX_start(bnctx); 2905 2906 if ((order = BN_CTX_get(bnctx)) == NULL || 2907 (tmp = BN_CTX_get(bnctx)) == NULL) { 2908 ret = SSH_ERR_ALLOC_FAIL; 2909 goto out; 2910 } 2911 2912 /* log2(private) > log2(order)/2 */ 2913 if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) { 2914 ret = SSH_ERR_LIBCRYPTO_ERROR; 2915 goto out; 2916 } 2917 if (BN_num_bits(EC_KEY_get0_private_key(key)) <= 2918 BN_num_bits(order) / 2) 2919 goto out; 2920 2921 /* private < order - 1 */ 2922 if (!BN_sub(tmp, order, BN_value_one())) { 2923 ret = SSH_ERR_LIBCRYPTO_ERROR; 2924 goto out; 2925 } 2926 if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0) 2927 goto out; 2928 ret = 0; 2929 out: 2930 BN_CTX_free(bnctx); 2931 return ret; 2932 } 2933 2934 void 2935 sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point) 2936 { 2937 BIGNUM *x, *y; 2938 BN_CTX *bnctx; 2939 2940 if (point == NULL) { 2941 fputs("point=(NULL)\n", stderr); 2942 return; 2943 } 2944 if ((bnctx = BN_CTX_new()) == NULL) { 2945 fprintf(stderr, "%s: BN_CTX_new failed\n", __func__); 2946 return; 2947 } 2948 BN_CTX_start(bnctx); 2949 if ((x = BN_CTX_get(bnctx)) == NULL || 2950 (y = BN_CTX_get(bnctx)) == NULL) { 2951 fprintf(stderr, "%s: BN_CTX_get failed\n", __func__); 2952 return; 2953 } 2954 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != 2955 NID_X9_62_prime_field) { 2956 fprintf(stderr, "%s: group is not a prime field\n", __func__); 2957 return; 2958 } 2959 if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y, 2960 bnctx) != 1) { 2961 fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n", 2962 __func__); 2963 return; 2964 } 2965 fputs("x=", stderr); 2966 BN_print_fp(stderr, x); 2967 fputs("\ny=", stderr); 2968 BN_print_fp(stderr, y); 2969 fputs("\n", stderr); 2970 BN_CTX_free(bnctx); 2971 } 2972 2973 void 2974 sshkey_dump_ec_key(const EC_KEY *key) 2975 { 2976 const BIGNUM *exponent; 2977 2978 sshkey_dump_ec_point(EC_KEY_get0_group(key), 2979 EC_KEY_get0_public_key(key)); 2980 fputs("exponent=", stderr); 2981 if ((exponent = EC_KEY_get0_private_key(key)) == NULL) 2982 fputs("(NULL)", stderr); 2983 else 2984 BN_print_fp(stderr, EC_KEY_get0_private_key(key)); 2985 fputs("\n", stderr); 2986 } 2987 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */ 2988 2989 static int 2990 sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob, 2991 const char *passphrase, const char *comment, const char *ciphername, 2992 int rounds) 2993 { 2994 u_char *cp, *key = NULL, *pubkeyblob = NULL; 2995 u_char salt[SALT_LEN]; 2996 char *b64 = NULL; 2997 size_t i, pubkeylen, keylen, ivlen, blocksize, authlen; 2998 u_int check; 2999 int r = SSH_ERR_INTERNAL_ERROR; 3000 struct sshcipher_ctx ciphercontext; 3001 const struct sshcipher *cipher; 3002 const char *kdfname = KDFNAME; 3003 struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL; 3004 3005 memset(&ciphercontext, 0, sizeof(ciphercontext)); 3006 3007 if (rounds <= 0) 3008 rounds = DEFAULT_ROUNDS; 3009 if (passphrase == NULL || !strlen(passphrase)) { 3010 ciphername = "none"; 3011 kdfname = "none"; 3012 } else if (ciphername == NULL) 3013 ciphername = DEFAULT_CIPHERNAME; 3014 else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) { 3015 r = SSH_ERR_INVALID_ARGUMENT; 3016 goto out; 3017 } 3018 if ((cipher = cipher_by_name(ciphername)) == NULL) { 3019 r = SSH_ERR_INTERNAL_ERROR; 3020 goto out; 3021 } 3022 3023 if ((kdf = sshbuf_new()) == NULL || 3024 (encoded = sshbuf_new()) == NULL || 3025 (encrypted = sshbuf_new()) == NULL) { 3026 r = SSH_ERR_ALLOC_FAIL; 3027 goto out; 3028 } 3029 blocksize = cipher_blocksize(cipher); 3030 keylen = cipher_keylen(cipher); 3031 ivlen = cipher_ivlen(cipher); 3032 authlen = cipher_authlen(cipher); 3033 if ((key = calloc(1, keylen + ivlen)) == NULL) { 3034 r = SSH_ERR_ALLOC_FAIL; 3035 goto out; 3036 } 3037 if (strcmp(kdfname, "bcrypt") == 0) { 3038 arc4random_buf(salt, SALT_LEN); 3039 if (bcrypt_pbkdf(passphrase, strlen(passphrase), 3040 salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) { 3041 r = SSH_ERR_INVALID_ARGUMENT; 3042 goto out; 3043 } 3044 if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 || 3045 (r = sshbuf_put_u32(kdf, rounds)) != 0) 3046 goto out; 3047 } else if (strcmp(kdfname, "none") != 0) { 3048 /* Unsupported KDF type */ 3049 r = SSH_ERR_KEY_UNKNOWN_CIPHER; 3050 goto out; 3051 } 3052 if ((r = cipher_init(&ciphercontext, cipher, key, keylen, 3053 key + keylen, ivlen, 1)) != 0) 3054 goto out; 3055 3056 if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 || 3057 (r = sshbuf_put_cstring(encoded, ciphername)) != 0 || 3058 (r = sshbuf_put_cstring(encoded, kdfname)) != 0 || 3059 (r = sshbuf_put_stringb(encoded, kdf)) != 0 || 3060 (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */ 3061 (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 || 3062 (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0) 3063 goto out; 3064 3065 /* set up the buffer that will be encrypted */ 3066 3067 /* Random check bytes */ 3068 check = arc4random(); 3069 if ((r = sshbuf_put_u32(encrypted, check)) != 0 || 3070 (r = sshbuf_put_u32(encrypted, check)) != 0) 3071 goto out; 3072 3073 /* append private key and comment*/ 3074 if ((r = sshkey_private_serialize(prv, encrypted)) != 0 || 3075 (r = sshbuf_put_cstring(encrypted, comment)) != 0) 3076 goto out; 3077 3078 /* padding */ 3079 i = 0; 3080 while (sshbuf_len(encrypted) % blocksize) { 3081 if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0) 3082 goto out; 3083 } 3084 3085 /* length in destination buffer */ 3086 if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0) 3087 goto out; 3088 3089 /* encrypt */ 3090 if ((r = sshbuf_reserve(encoded, 3091 sshbuf_len(encrypted) + authlen, &cp)) != 0) 3092 goto out; 3093 if ((r = cipher_crypt(&ciphercontext, 0, cp, 3094 sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0) 3095 goto out; 3096 3097 /* uuencode */ 3098 if ((b64 = sshbuf_dtob64(encoded)) == NULL) { 3099 r = SSH_ERR_ALLOC_FAIL; 3100 goto out; 3101 } 3102 3103 sshbuf_reset(blob); 3104 if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0) 3105 goto out; 3106 for (i = 0; i < strlen(b64); i++) { 3107 if ((r = sshbuf_put_u8(blob, b64[i])) != 0) 3108 goto out; 3109 /* insert line breaks */ 3110 if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0) 3111 goto out; 3112 } 3113 if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0) 3114 goto out; 3115 if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0) 3116 goto out; 3117 3118 /* success */ 3119 r = 0; 3120 3121 out: 3122 sshbuf_free(kdf); 3123 sshbuf_free(encoded); 3124 sshbuf_free(encrypted); 3125 cipher_cleanup(&ciphercontext); 3126 explicit_bzero(salt, sizeof(salt)); 3127 if (key != NULL) { 3128 explicit_bzero(key, keylen + ivlen); 3129 free(key); 3130 } 3131 if (pubkeyblob != NULL) { 3132 explicit_bzero(pubkeyblob, pubkeylen); 3133 free(pubkeyblob); 3134 } 3135 if (b64 != NULL) { 3136 explicit_bzero(b64, strlen(b64)); 3137 free(b64); 3138 } 3139 return r; 3140 } 3141 3142 static int 3143 sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase, 3144 struct sshkey **keyp, char **commentp) 3145 { 3146 char *comment = NULL, *ciphername = NULL, *kdfname = NULL; 3147 const struct sshcipher *cipher = NULL; 3148 const u_char *cp; 3149 int r = SSH_ERR_INTERNAL_ERROR; 3150 size_t encoded_len; 3151 size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0; 3152 struct sshbuf *encoded = NULL, *decoded = NULL; 3153 struct sshbuf *kdf = NULL, *decrypted = NULL; 3154 struct sshcipher_ctx ciphercontext; 3155 struct sshkey *k = NULL; 3156 u_char *key = NULL, *salt = NULL, *dp, pad, last; 3157 u_int blocksize, rounds, nkeys, encrypted_len, check1, check2; 3158 3159 memset(&ciphercontext, 0, sizeof(ciphercontext)); 3160 if (keyp != NULL) 3161 *keyp = NULL; 3162 if (commentp != NULL) 3163 *commentp = NULL; 3164 3165 if ((encoded = sshbuf_new()) == NULL || 3166 (decoded = sshbuf_new()) == NULL || 3167 (decrypted = sshbuf_new()) == NULL) { 3168 r = SSH_ERR_ALLOC_FAIL; 3169 goto out; 3170 } 3171 3172 /* check preamble */ 3173 cp = sshbuf_ptr(blob); 3174 encoded_len = sshbuf_len(blob); 3175 if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) || 3176 memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) { 3177 r = SSH_ERR_INVALID_FORMAT; 3178 goto out; 3179 } 3180 cp += MARK_BEGIN_LEN; 3181 encoded_len -= MARK_BEGIN_LEN; 3182 3183 /* Look for end marker, removing whitespace as we go */ 3184 while (encoded_len > 0) { 3185 if (*cp != '\n' && *cp != '\r') { 3186 if ((r = sshbuf_put_u8(encoded, *cp)) != 0) 3187 goto out; 3188 } 3189 last = *cp; 3190 encoded_len--; 3191 cp++; 3192 if (last == '\n') { 3193 if (encoded_len >= MARK_END_LEN && 3194 memcmp(cp, MARK_END, MARK_END_LEN) == 0) { 3195 /* \0 terminate */ 3196 if ((r = sshbuf_put_u8(encoded, 0)) != 0) 3197 goto out; 3198 break; 3199 } 3200 } 3201 } 3202 if (encoded_len == 0) { 3203 r = SSH_ERR_INVALID_FORMAT; 3204 goto out; 3205 } 3206 3207 /* decode base64 */ 3208 if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0) 3209 goto out; 3210 3211 /* check magic */ 3212 if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) || 3213 memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) { 3214 r = SSH_ERR_INVALID_FORMAT; 3215 goto out; 3216 } 3217 /* parse public portion of key */ 3218 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 || 3219 (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 || 3220 (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 || 3221 (r = sshbuf_froms(decoded, &kdf)) != 0 || 3222 (r = sshbuf_get_u32(decoded, &nkeys)) != 0 || 3223 (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */ 3224 (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0) 3225 goto out; 3226 3227 if ((cipher = cipher_by_name(ciphername)) == NULL) { 3228 r = SSH_ERR_KEY_UNKNOWN_CIPHER; 3229 goto out; 3230 } 3231 if ((passphrase == NULL || strlen(passphrase) == 0) && 3232 strcmp(ciphername, "none") != 0) { 3233 /* passphrase required */ 3234 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 3235 goto out; 3236 } 3237 if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) { 3238 r = SSH_ERR_KEY_UNKNOWN_CIPHER; 3239 goto out; 3240 } 3241 if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) { 3242 r = SSH_ERR_INVALID_FORMAT; 3243 goto out; 3244 } 3245 if (nkeys != 1) { 3246 /* XXX only one key supported */ 3247 r = SSH_ERR_INVALID_FORMAT; 3248 goto out; 3249 } 3250 3251 /* check size of encrypted key blob */ 3252 blocksize = cipher_blocksize(cipher); 3253 if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) { 3254 r = SSH_ERR_INVALID_FORMAT; 3255 goto out; 3256 } 3257 3258 /* setup key */ 3259 keylen = cipher_keylen(cipher); 3260 ivlen = cipher_ivlen(cipher); 3261 authlen = cipher_authlen(cipher); 3262 if ((key = calloc(1, keylen + ivlen)) == NULL) { 3263 r = SSH_ERR_ALLOC_FAIL; 3264 goto out; 3265 } 3266 if (strcmp(kdfname, "bcrypt") == 0) { 3267 if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 || 3268 (r = sshbuf_get_u32(kdf, &rounds)) != 0) 3269 goto out; 3270 if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen, 3271 key, keylen + ivlen, rounds) < 0) { 3272 r = SSH_ERR_INVALID_FORMAT; 3273 goto out; 3274 } 3275 } 3276 3277 /* check that an appropriate amount of auth data is present */ 3278 if (sshbuf_len(decoded) < encrypted_len + authlen) { 3279 r = SSH_ERR_INVALID_FORMAT; 3280 goto out; 3281 } 3282 3283 /* decrypt private portion of key */ 3284 if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 || 3285 (r = cipher_init(&ciphercontext, cipher, key, keylen, 3286 key + keylen, ivlen, 0)) != 0) 3287 goto out; 3288 if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded), 3289 encrypted_len, 0, authlen)) != 0) { 3290 /* an integrity error here indicates an incorrect passphrase */ 3291 if (r == SSH_ERR_MAC_INVALID) 3292 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 3293 goto out; 3294 } 3295 if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0) 3296 goto out; 3297 /* there should be no trailing data */ 3298 if (sshbuf_len(decoded) != 0) { 3299 r = SSH_ERR_INVALID_FORMAT; 3300 goto out; 3301 } 3302 3303 /* check check bytes */ 3304 if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 || 3305 (r = sshbuf_get_u32(decrypted, &check2)) != 0) 3306 goto out; 3307 if (check1 != check2) { 3308 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 3309 goto out; 3310 } 3311 3312 /* Load the private key and comment */ 3313 if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 || 3314 (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0) 3315 goto out; 3316 3317 /* Check deterministic padding */ 3318 i = 0; 3319 while (sshbuf_len(decrypted)) { 3320 if ((r = sshbuf_get_u8(decrypted, &pad)) != 0) 3321 goto out; 3322 if (pad != (++i & 0xff)) { 3323 r = SSH_ERR_INVALID_FORMAT; 3324 goto out; 3325 } 3326 } 3327 3328 /* XXX decode pubkey and check against private */ 3329 3330 /* success */ 3331 r = 0; 3332 if (keyp != NULL) { 3333 *keyp = k; 3334 k = NULL; 3335 } 3336 if (commentp != NULL) { 3337 *commentp = comment; 3338 comment = NULL; 3339 } 3340 out: 3341 pad = 0; 3342 cipher_cleanup(&ciphercontext); 3343 free(ciphername); 3344 free(kdfname); 3345 free(comment); 3346 if (salt != NULL) { 3347 explicit_bzero(salt, slen); 3348 free(salt); 3349 } 3350 if (key != NULL) { 3351 explicit_bzero(key, keylen + ivlen); 3352 free(key); 3353 } 3354 sshbuf_free(encoded); 3355 sshbuf_free(decoded); 3356 sshbuf_free(kdf); 3357 sshbuf_free(decrypted); 3358 sshkey_free(k); 3359 return r; 3360 } 3361 3362 #if WITH_SSH1 3363 /* 3364 * Serialises the authentication (private) key to a blob, encrypting it with 3365 * passphrase. The identification of the blob (lowest 64 bits of n) will 3366 * precede the key to provide identification of the key without needing a 3367 * passphrase. 3368 */ 3369 static int 3370 sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob, 3371 const char *passphrase, const char *comment) 3372 { 3373 struct sshbuf *buffer = NULL, *encrypted = NULL; 3374 u_char buf[8]; 3375 int r, cipher_num; 3376 struct sshcipher_ctx ciphercontext; 3377 const struct sshcipher *cipher; 3378 u_char *cp; 3379 3380 /* 3381 * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting 3382 * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. 3383 */ 3384 cipher_num = (strcmp(passphrase, "") == 0) ? 3385 SSH_CIPHER_NONE : SSH_CIPHER_3DES; 3386 if ((cipher = cipher_by_number(cipher_num)) == NULL) 3387 return SSH_ERR_INTERNAL_ERROR; 3388 3389 /* This buffer is used to build the secret part of the private key. */ 3390 if ((buffer = sshbuf_new()) == NULL) 3391 return SSH_ERR_ALLOC_FAIL; 3392 3393 /* Put checkbytes for checking passphrase validity. */ 3394 if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0) 3395 goto out; 3396 arc4random_buf(cp, 2); 3397 memcpy(cp + 2, cp, 2); 3398 3399 /* 3400 * Store the private key (n and e will not be stored because they 3401 * will be stored in plain text, and storing them also in encrypted 3402 * format would just give known plaintext). 3403 * Note: q and p are stored in reverse order to SSL. 3404 */ 3405 if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 || 3406 (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 || 3407 (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 || 3408 (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0) 3409 goto out; 3410 3411 /* Pad the part to be encrypted to a size that is a multiple of 8. */ 3412 explicit_bzero(buf, 8); 3413 if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0) 3414 goto out; 3415 3416 /* This buffer will be used to contain the data in the file. */ 3417 if ((encrypted = sshbuf_new()) == NULL) { 3418 r = SSH_ERR_ALLOC_FAIL; 3419 goto out; 3420 } 3421 3422 /* First store keyfile id string. */ 3423 if ((r = sshbuf_put(encrypted, LEGACY_BEGIN, 3424 sizeof(LEGACY_BEGIN))) != 0) 3425 goto out; 3426 3427 /* Store cipher type and "reserved" field. */ 3428 if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 || 3429 (r = sshbuf_put_u32(encrypted, 0)) != 0) 3430 goto out; 3431 3432 /* Store public key. This will be in plain text. */ 3433 if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 || 3434 (r = sshbuf_put_bignum1(encrypted, key->rsa->n) != 0) || 3435 (r = sshbuf_put_bignum1(encrypted, key->rsa->e) != 0) || 3436 (r = sshbuf_put_cstring(encrypted, comment) != 0)) 3437 goto out; 3438 3439 /* Allocate space for the private part of the key in the buffer. */ 3440 if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0) 3441 goto out; 3442 3443 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase, 3444 CIPHER_ENCRYPT)) != 0) 3445 goto out; 3446 if ((r = cipher_crypt(&ciphercontext, 0, cp, 3447 sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0) 3448 goto out; 3449 if ((r = cipher_cleanup(&ciphercontext)) != 0) 3450 goto out; 3451 3452 r = sshbuf_putb(blob, encrypted); 3453 3454 out: 3455 explicit_bzero(&ciphercontext, sizeof(ciphercontext)); 3456 explicit_bzero(buf, sizeof(buf)); 3457 if (buffer != NULL) 3458 sshbuf_free(buffer); 3459 if (encrypted != NULL) 3460 sshbuf_free(encrypted); 3461 3462 return r; 3463 } 3464 #endif /* WITH_SSH1 */ 3465 3466 #ifdef WITH_OPENSSL 3467 /* convert SSH v2 key in OpenSSL PEM format */ 3468 static int 3469 sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob, 3470 const char *_passphrase, const char *comment) 3471 { 3472 int success, r; 3473 int blen, len = strlen(_passphrase); 3474 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; 3475 #if (OPENSSL_VERSION_NUMBER < 0x00907000L) 3476 const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; 3477 #else 3478 const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL; 3479 #endif 3480 const u_char *bptr; 3481 BIO *bio = NULL; 3482 3483 if (len > 0 && len <= 4) 3484 return SSH_ERR_PASSPHRASE_TOO_SHORT; 3485 if ((bio = BIO_new(BIO_s_mem())) == NULL) 3486 return SSH_ERR_ALLOC_FAIL; 3487 3488 switch (key->type) { 3489 case KEY_DSA: 3490 success = PEM_write_bio_DSAPrivateKey(bio, key->dsa, 3491 cipher, passphrase, len, NULL, NULL); 3492 break; 3493 #ifdef OPENSSL_HAS_ECC 3494 case KEY_ECDSA: 3495 success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa, 3496 cipher, passphrase, len, NULL, NULL); 3497 break; 3498 #endif 3499 case KEY_RSA: 3500 success = PEM_write_bio_RSAPrivateKey(bio, key->rsa, 3501 cipher, passphrase, len, NULL, NULL); 3502 break; 3503 default: 3504 success = 0; 3505 break; 3506 } 3507 if (success == 0) { 3508 r = SSH_ERR_LIBCRYPTO_ERROR; 3509 goto out; 3510 } 3511 if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) { 3512 r = SSH_ERR_INTERNAL_ERROR; 3513 goto out; 3514 } 3515 if ((r = sshbuf_put(blob, bptr, blen)) != 0) 3516 goto out; 3517 r = 0; 3518 out: 3519 BIO_free(bio); 3520 return r; 3521 } 3522 #endif /* WITH_OPENSSL */ 3523 3524 /* Serialise "key" to buffer "blob" */ 3525 int 3526 sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob, 3527 const char *passphrase, const char *comment, 3528 int force_new_format, const char *new_format_cipher, int new_format_rounds) 3529 { 3530 switch (key->type) { 3531 #ifdef WITH_SSH1 3532 case KEY_RSA1: 3533 return sshkey_private_rsa1_to_blob(key, blob, 3534 passphrase, comment); 3535 #endif /* WITH_SSH1 */ 3536 #ifdef WITH_OPENSSL 3537 case KEY_DSA: 3538 case KEY_ECDSA: 3539 case KEY_RSA: 3540 if (force_new_format) { 3541 return sshkey_private_to_blob2(key, blob, passphrase, 3542 comment, new_format_cipher, new_format_rounds); 3543 } 3544 return sshkey_private_pem_to_blob(key, blob, 3545 passphrase, comment); 3546 #endif /* WITH_OPENSSL */ 3547 case KEY_ED25519: 3548 return sshkey_private_to_blob2(key, blob, passphrase, 3549 comment, new_format_cipher, new_format_rounds); 3550 default: 3551 return SSH_ERR_KEY_TYPE_UNKNOWN; 3552 } 3553 } 3554 3555 #ifdef WITH_SSH1 3556 /* 3557 * Parse the public, unencrypted portion of a RSA1 key. 3558 */ 3559 int 3560 sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob, 3561 struct sshkey **keyp, char **commentp) 3562 { 3563 int r; 3564 struct sshkey *pub = NULL; 3565 struct sshbuf *copy = NULL; 3566 3567 if (keyp != NULL) 3568 *keyp = NULL; 3569 if (commentp != NULL) 3570 *commentp = NULL; 3571 3572 /* Check that it is at least big enough to contain the ID string. */ 3573 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN)) 3574 return SSH_ERR_INVALID_FORMAT; 3575 3576 /* 3577 * Make sure it begins with the id string. Consume the id string 3578 * from the buffer. 3579 */ 3580 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0) 3581 return SSH_ERR_INVALID_FORMAT; 3582 /* Make a working copy of the keyblob and skip past the magic */ 3583 if ((copy = sshbuf_fromb(blob)) == NULL) 3584 return SSH_ERR_ALLOC_FAIL; 3585 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0) 3586 goto out; 3587 3588 /* Skip cipher type, reserved data and key bits. */ 3589 if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */ 3590 (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */ 3591 (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */ 3592 goto out; 3593 3594 /* Read the public key from the buffer. */ 3595 if ((pub = sshkey_new(KEY_RSA1)) == NULL || 3596 (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 || 3597 (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0) 3598 goto out; 3599 3600 /* Finally, the comment */ 3601 if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0) 3602 goto out; 3603 3604 /* The encrypted private part is not parsed by this function. */ 3605 3606 r = 0; 3607 if (keyp != NULL) 3608 *keyp = pub; 3609 else 3610 sshkey_free(pub); 3611 pub = NULL; 3612 3613 out: 3614 if (copy != NULL) 3615 sshbuf_free(copy); 3616 if (pub != NULL) 3617 sshkey_free(pub); 3618 return r; 3619 } 3620 3621 static int 3622 sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase, 3623 struct sshkey **keyp, char **commentp) 3624 { 3625 int r; 3626 u_int16_t check1, check2; 3627 u_int8_t cipher_type; 3628 struct sshbuf *decrypted = NULL, *copy = NULL; 3629 u_char *cp; 3630 char *comment = NULL; 3631 struct sshcipher_ctx ciphercontext; 3632 const struct sshcipher *cipher; 3633 struct sshkey *prv = NULL; 3634 3635 *keyp = NULL; 3636 if (commentp != NULL) 3637 *commentp = NULL; 3638 3639 /* Check that it is at least big enough to contain the ID string. */ 3640 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN)) 3641 return SSH_ERR_INVALID_FORMAT; 3642 3643 /* 3644 * Make sure it begins with the id string. Consume the id string 3645 * from the buffer. 3646 */ 3647 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0) 3648 return SSH_ERR_INVALID_FORMAT; 3649 3650 if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) { 3651 r = SSH_ERR_ALLOC_FAIL; 3652 goto out; 3653 } 3654 if ((copy = sshbuf_fromb(blob)) == NULL || 3655 (decrypted = sshbuf_new()) == NULL) { 3656 r = SSH_ERR_ALLOC_FAIL; 3657 goto out; 3658 } 3659 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0) 3660 goto out; 3661 3662 /* Read cipher type. */ 3663 if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 || 3664 (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */ 3665 goto out; 3666 3667 /* Read the public key and comment from the buffer. */ 3668 if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */ 3669 (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 || 3670 (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 || 3671 (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0) 3672 goto out; 3673 3674 /* Check that it is a supported cipher. */ 3675 cipher = cipher_by_number(cipher_type); 3676 if (cipher == NULL) { 3677 r = SSH_ERR_KEY_UNKNOWN_CIPHER; 3678 goto out; 3679 } 3680 /* Initialize space for decrypted data. */ 3681 if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0) 3682 goto out; 3683 3684 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ 3685 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase, 3686 CIPHER_DECRYPT)) != 0) 3687 goto out; 3688 if ((r = cipher_crypt(&ciphercontext, 0, cp, 3689 sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) { 3690 cipher_cleanup(&ciphercontext); 3691 goto out; 3692 } 3693 if ((r = cipher_cleanup(&ciphercontext)) != 0) 3694 goto out; 3695 3696 if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 || 3697 (r = sshbuf_get_u16(decrypted, &check2)) != 0) 3698 goto out; 3699 if (check1 != check2) { 3700 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 3701 goto out; 3702 } 3703 3704 /* Read the rest of the private key. */ 3705 if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 || 3706 (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 || 3707 (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 || 3708 (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0) 3709 goto out; 3710 3711 /* calculate p-1 and q-1 */ 3712 if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0) 3713 goto out; 3714 3715 /* enable blinding */ 3716 if (RSA_blinding_on(prv->rsa, NULL) != 1) { 3717 r = SSH_ERR_LIBCRYPTO_ERROR; 3718 goto out; 3719 } 3720 r = 0; 3721 *keyp = prv; 3722 prv = NULL; 3723 if (commentp != NULL) { 3724 *commentp = comment; 3725 comment = NULL; 3726 } 3727 out: 3728 explicit_bzero(&ciphercontext, sizeof(ciphercontext)); 3729 if (comment != NULL) 3730 free(comment); 3731 if (prv != NULL) 3732 sshkey_free(prv); 3733 if (copy != NULL) 3734 sshbuf_free(copy); 3735 if (decrypted != NULL) 3736 sshbuf_free(decrypted); 3737 return r; 3738 } 3739 #endif /* WITH_SSH1 */ 3740 3741 #ifdef WITH_OPENSSL 3742 static int 3743 sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type, 3744 const char *passphrase, struct sshkey **keyp) 3745 { 3746 EVP_PKEY *pk = NULL; 3747 struct sshkey *prv = NULL; 3748 BIO *bio = NULL; 3749 int r; 3750 3751 *keyp = NULL; 3752 3753 if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX) 3754 return SSH_ERR_ALLOC_FAIL; 3755 if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) != 3756 (int)sshbuf_len(blob)) { 3757 r = SSH_ERR_ALLOC_FAIL; 3758 goto out; 3759 } 3760 3761 if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL, 3762 (char *)passphrase)) == NULL) { 3763 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 3764 goto out; 3765 } 3766 if (pk->type == EVP_PKEY_RSA && 3767 (type == KEY_UNSPEC || type == KEY_RSA)) { 3768 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { 3769 r = SSH_ERR_ALLOC_FAIL; 3770 goto out; 3771 } 3772 prv->rsa = EVP_PKEY_get1_RSA(pk); 3773 prv->type = KEY_RSA; 3774 #ifdef DEBUG_PK 3775 RSA_print_fp(stderr, prv->rsa, 8); 3776 #endif 3777 if (RSA_blinding_on(prv->rsa, NULL) != 1) { 3778 r = SSH_ERR_LIBCRYPTO_ERROR; 3779 goto out; 3780 } 3781 } else if (pk->type == EVP_PKEY_DSA && 3782 (type == KEY_UNSPEC || type == KEY_DSA)) { 3783 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { 3784 r = SSH_ERR_ALLOC_FAIL; 3785 goto out; 3786 } 3787 prv->dsa = EVP_PKEY_get1_DSA(pk); 3788 prv->type = KEY_DSA; 3789 #ifdef DEBUG_PK 3790 DSA_print_fp(stderr, prv->dsa, 8); 3791 #endif 3792 #ifdef OPENSSL_HAS_ECC 3793 } else if (pk->type == EVP_PKEY_EC && 3794 (type == KEY_UNSPEC || type == KEY_ECDSA)) { 3795 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { 3796 r = SSH_ERR_ALLOC_FAIL; 3797 goto out; 3798 } 3799 prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk); 3800 prv->type = KEY_ECDSA; 3801 prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa); 3802 if (prv->ecdsa_nid == -1 || 3803 sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL || 3804 sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa), 3805 EC_KEY_get0_public_key(prv->ecdsa)) != 0 || 3806 sshkey_ec_validate_private(prv->ecdsa) != 0) { 3807 r = SSH_ERR_INVALID_FORMAT; 3808 goto out; 3809 } 3810 # ifdef DEBUG_PK 3811 if (prv != NULL && prv->ecdsa != NULL) 3812 sshkey_dump_ec_key(prv->ecdsa); 3813 # endif 3814 #endif /* OPENSSL_HAS_ECC */ 3815 } else { 3816 r = SSH_ERR_INVALID_FORMAT; 3817 goto out; 3818 } 3819 r = 0; 3820 *keyp = prv; 3821 prv = NULL; 3822 out: 3823 BIO_free(bio); 3824 if (pk != NULL) 3825 EVP_PKEY_free(pk); 3826 if (prv != NULL) 3827 sshkey_free(prv); 3828 return r; 3829 } 3830 #endif /* WITH_OPENSSL */ 3831 3832 int 3833 sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type, 3834 const char *passphrase, struct sshkey **keyp, char **commentp) 3835 { 3836 int r; 3837 3838 *keyp = NULL; 3839 if (commentp != NULL) 3840 *commentp = NULL; 3841 3842 switch (type) { 3843 #ifdef WITH_SSH1 3844 case KEY_RSA1: 3845 return sshkey_parse_private_rsa1(blob, passphrase, 3846 keyp, commentp); 3847 #endif /* WITH_SSH1 */ 3848 #ifdef WITH_OPENSSL 3849 case KEY_DSA: 3850 case KEY_ECDSA: 3851 case KEY_RSA: 3852 return sshkey_parse_private_pem_fileblob(blob, type, 3853 passphrase, keyp); 3854 #endif /* WITH_OPENSSL */ 3855 case KEY_ED25519: 3856 return sshkey_parse_private2(blob, type, passphrase, 3857 keyp, commentp); 3858 case KEY_UNSPEC: 3859 if ((r = sshkey_parse_private2(blob, type, passphrase, keyp, 3860 commentp)) == 0) 3861 return 0; 3862 #ifdef WITH_OPENSSL 3863 return sshkey_parse_private_pem_fileblob(blob, type, 3864 passphrase, keyp); 3865 #else 3866 return SSH_ERR_INVALID_FORMAT; 3867 #endif /* WITH_OPENSSL */ 3868 default: 3869 return SSH_ERR_KEY_TYPE_UNKNOWN; 3870 } 3871 } 3872 3873 int 3874 sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase, 3875 const char *filename, struct sshkey **keyp, char **commentp) 3876 { 3877 int r; 3878 3879 if (keyp != NULL) 3880 *keyp = NULL; 3881 if (commentp != NULL) 3882 *commentp = NULL; 3883 3884 #ifdef WITH_SSH1 3885 /* it's a SSH v1 key if the public key part is readable */ 3886 if ((r = sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL)) == 0) { 3887 return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1, 3888 passphrase, keyp, commentp); 3889 } 3890 #endif /* WITH_SSH1 */ 3891 if ((r = sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC, 3892 passphrase, keyp, commentp)) == 0) 3893 return 0; 3894 return r; 3895 } 3896