1 /* $OpenBSD: sshkey.c,v 1.31 2015/12/11 04:21:12 mmcc 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 int sigonly; 87 }; 88 static const struct keytype keytypes[] = { 89 { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0, 0 }, 90 { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT", 91 KEY_ED25519_CERT, 0, 1, 0 }, 92 #ifdef WITH_OPENSSL 93 { NULL, "RSA1", KEY_RSA1, 0, 0, 0 }, 94 { "ssh-rsa", "RSA", KEY_RSA, 0, 0, 0 }, 95 { "rsa-sha2-256", "RSA", KEY_RSA, 0, 0, 1 }, 96 { "rsa-sha2-512", "RSA", KEY_RSA, 0, 0, 1 }, 97 { "ssh-dss", "DSA", KEY_DSA, 0, 0, 0 }, 98 # ifdef OPENSSL_HAS_ECC 99 { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0, 0 }, 100 { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0, 0 }, 101 # ifdef OPENSSL_HAS_NISTP521 102 { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0, 0 }, 103 # endif /* OPENSSL_HAS_NISTP521 */ 104 # endif /* OPENSSL_HAS_ECC */ 105 { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1, 0 }, 106 { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1, 0 }, 107 # ifdef OPENSSL_HAS_ECC 108 { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT", 109 KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1, 0 }, 110 { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT", 111 KEY_ECDSA_CERT, NID_secp384r1, 1, 0 }, 112 # ifdef OPENSSL_HAS_NISTP521 113 { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT", 114 KEY_ECDSA_CERT, NID_secp521r1, 1, 0 }, 115 # endif /* OPENSSL_HAS_NISTP521 */ 116 # endif /* OPENSSL_HAS_ECC */ 117 #endif /* WITH_OPENSSL */ 118 { NULL, NULL, -1, -1, 0, 0 } 119 }; 120 121 const char * 122 sshkey_type(const struct sshkey *k) 123 { 124 const struct keytype *kt; 125 126 for (kt = keytypes; kt->type != -1; kt++) { 127 if (kt->type == k->type) 128 return kt->shortname; 129 } 130 return "unknown"; 131 } 132 133 static const char * 134 sshkey_ssh_name_from_type_nid(int type, int nid) 135 { 136 const struct keytype *kt; 137 138 for (kt = keytypes; kt->type != -1; kt++) { 139 if (kt->type == type && (kt->nid == 0 || kt->nid == nid)) 140 return kt->name; 141 } 142 return "ssh-unknown"; 143 } 144 145 int 146 sshkey_type_is_cert(int type) 147 { 148 const struct keytype *kt; 149 150 for (kt = keytypes; kt->type != -1; kt++) { 151 if (kt->type == type) 152 return kt->cert; 153 } 154 return 0; 155 } 156 157 const char * 158 sshkey_ssh_name(const struct sshkey *k) 159 { 160 return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid); 161 } 162 163 const char * 164 sshkey_ssh_name_plain(const struct sshkey *k) 165 { 166 return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type), 167 k->ecdsa_nid); 168 } 169 170 int 171 sshkey_type_from_name(const char *name) 172 { 173 const struct keytype *kt; 174 175 for (kt = keytypes; kt->type != -1; kt++) { 176 /* Only allow shortname matches for plain key types */ 177 if ((kt->name != NULL && strcmp(name, kt->name) == 0) || 178 (!kt->cert && strcasecmp(kt->shortname, name) == 0)) 179 return kt->type; 180 } 181 return KEY_UNSPEC; 182 } 183 184 int 185 sshkey_ecdsa_nid_from_name(const char *name) 186 { 187 const struct keytype *kt; 188 189 for (kt = keytypes; kt->type != -1; kt++) { 190 if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT) 191 continue; 192 if (kt->name != NULL && strcmp(name, kt->name) == 0) 193 return kt->nid; 194 } 195 return -1; 196 } 197 198 char * 199 key_alg_list(int certs_only, int plain_only) 200 { 201 char *tmp, *ret = NULL; 202 size_t nlen, rlen = 0; 203 const struct keytype *kt; 204 205 for (kt = keytypes; kt->type != -1; kt++) { 206 if (kt->name == NULL || kt->sigonly) 207 continue; 208 if ((certs_only && !kt->cert) || (plain_only && kt->cert)) 209 continue; 210 if (ret != NULL) 211 ret[rlen++] = '\n'; 212 nlen = strlen(kt->name); 213 if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) { 214 free(ret); 215 return NULL; 216 } 217 ret = tmp; 218 memcpy(ret + rlen, kt->name, nlen + 1); 219 rlen += nlen; 220 } 221 return ret; 222 } 223 224 int 225 sshkey_names_valid2(const char *names, int allow_wildcard) 226 { 227 char *s, *cp, *p; 228 const struct keytype *kt; 229 int type; 230 231 if (names == NULL || strcmp(names, "") == 0) 232 return 0; 233 if ((s = cp = strdup(names)) == NULL) 234 return 0; 235 for ((p = strsep(&cp, ",")); p && *p != '\0'; 236 (p = strsep(&cp, ","))) { 237 type = sshkey_type_from_name(p); 238 if (type == KEY_RSA1) { 239 free(s); 240 return 0; 241 } 242 if (type == KEY_UNSPEC) { 243 if (allow_wildcard) { 244 /* 245 * Try matching key types against the string. 246 * If any has a positive or negative match then 247 * the component is accepted. 248 */ 249 for (kt = keytypes; kt->type != -1; kt++) { 250 if (kt->type == KEY_RSA1) 251 continue; 252 if (match_pattern_list(kt->name, 253 p, 0) != 0) 254 break; 255 } 256 if (kt->type != -1) 257 continue; 258 } 259 free(s); 260 return 0; 261 } 262 } 263 free(s); 264 return 1; 265 } 266 267 u_int 268 sshkey_size(const struct sshkey *k) 269 { 270 switch (k->type) { 271 #ifdef WITH_OPENSSL 272 case KEY_RSA1: 273 case KEY_RSA: 274 case KEY_RSA_CERT: 275 return BN_num_bits(k->rsa->n); 276 case KEY_DSA: 277 case KEY_DSA_CERT: 278 return BN_num_bits(k->dsa->p); 279 case KEY_ECDSA: 280 case KEY_ECDSA_CERT: 281 return sshkey_curve_nid_to_bits(k->ecdsa_nid); 282 #endif /* WITH_OPENSSL */ 283 case KEY_ED25519: 284 case KEY_ED25519_CERT: 285 return 256; /* XXX */ 286 } 287 return 0; 288 } 289 290 static int 291 sshkey_type_is_valid_ca(int type) 292 { 293 switch (type) { 294 case KEY_RSA: 295 case KEY_DSA: 296 case KEY_ECDSA: 297 case KEY_ED25519: 298 return 1; 299 default: 300 return 0; 301 } 302 } 303 304 int 305 sshkey_is_cert(const struct sshkey *k) 306 { 307 if (k == NULL) 308 return 0; 309 return sshkey_type_is_cert(k->type); 310 } 311 312 /* Return the cert-less equivalent to a certified key type */ 313 int 314 sshkey_type_plain(int type) 315 { 316 switch (type) { 317 case KEY_RSA_CERT: 318 return KEY_RSA; 319 case KEY_DSA_CERT: 320 return KEY_DSA; 321 case KEY_ECDSA_CERT: 322 return KEY_ECDSA; 323 case KEY_ED25519_CERT: 324 return KEY_ED25519; 325 default: 326 return type; 327 } 328 } 329 330 #ifdef WITH_OPENSSL 331 /* XXX: these are really begging for a table-driven approach */ 332 int 333 sshkey_curve_name_to_nid(const char *name) 334 { 335 if (strcmp(name, "nistp256") == 0) 336 return NID_X9_62_prime256v1; 337 else if (strcmp(name, "nistp384") == 0) 338 return NID_secp384r1; 339 # ifdef OPENSSL_HAS_NISTP521 340 else if (strcmp(name, "nistp521") == 0) 341 return NID_secp521r1; 342 # endif /* OPENSSL_HAS_NISTP521 */ 343 else 344 return -1; 345 } 346 347 u_int 348 sshkey_curve_nid_to_bits(int nid) 349 { 350 switch (nid) { 351 case NID_X9_62_prime256v1: 352 return 256; 353 case NID_secp384r1: 354 return 384; 355 # ifdef OPENSSL_HAS_NISTP521 356 case NID_secp521r1: 357 return 521; 358 # endif /* OPENSSL_HAS_NISTP521 */ 359 default: 360 return 0; 361 } 362 } 363 364 int 365 sshkey_ecdsa_bits_to_nid(int bits) 366 { 367 switch (bits) { 368 case 256: 369 return NID_X9_62_prime256v1; 370 case 384: 371 return NID_secp384r1; 372 # ifdef OPENSSL_HAS_NISTP521 373 case 521: 374 return NID_secp521r1; 375 # endif /* OPENSSL_HAS_NISTP521 */ 376 default: 377 return -1; 378 } 379 } 380 381 const char * 382 sshkey_curve_nid_to_name(int nid) 383 { 384 switch (nid) { 385 case NID_X9_62_prime256v1: 386 return "nistp256"; 387 case NID_secp384r1: 388 return "nistp384"; 389 # ifdef OPENSSL_HAS_NISTP521 390 case NID_secp521r1: 391 return "nistp521"; 392 # endif /* OPENSSL_HAS_NISTP521 */ 393 default: 394 return NULL; 395 } 396 } 397 398 int 399 sshkey_ec_nid_to_hash_alg(int nid) 400 { 401 int kbits = sshkey_curve_nid_to_bits(nid); 402 403 if (kbits <= 0) 404 return -1; 405 406 /* RFC5656 section 6.2.1 */ 407 if (kbits <= 256) 408 return SSH_DIGEST_SHA256; 409 else if (kbits <= 384) 410 return SSH_DIGEST_SHA384; 411 else 412 return SSH_DIGEST_SHA512; 413 } 414 #endif /* WITH_OPENSSL */ 415 416 static void 417 cert_free(struct sshkey_cert *cert) 418 { 419 u_int i; 420 421 if (cert == NULL) 422 return; 423 sshbuf_free(cert->certblob); 424 sshbuf_free(cert->critical); 425 sshbuf_free(cert->extensions); 426 free(cert->key_id); 427 for (i = 0; i < cert->nprincipals; i++) 428 free(cert->principals[i]); 429 free(cert->principals); 430 sshkey_free(cert->signature_key); 431 explicit_bzero(cert, sizeof(*cert)); 432 free(cert); 433 } 434 435 static struct sshkey_cert * 436 cert_new(void) 437 { 438 struct sshkey_cert *cert; 439 440 if ((cert = calloc(1, sizeof(*cert))) == NULL) 441 return NULL; 442 if ((cert->certblob = sshbuf_new()) == NULL || 443 (cert->critical = sshbuf_new()) == NULL || 444 (cert->extensions = sshbuf_new()) == NULL) { 445 cert_free(cert); 446 return NULL; 447 } 448 cert->key_id = NULL; 449 cert->principals = NULL; 450 cert->signature_key = NULL; 451 return cert; 452 } 453 454 struct sshkey * 455 sshkey_new(int type) 456 { 457 struct sshkey *k; 458 #ifdef WITH_OPENSSL 459 RSA *rsa; 460 DSA *dsa; 461 #endif /* WITH_OPENSSL */ 462 463 if ((k = calloc(1, sizeof(*k))) == NULL) 464 return NULL; 465 k->type = type; 466 k->ecdsa = NULL; 467 k->ecdsa_nid = -1; 468 k->dsa = NULL; 469 k->rsa = NULL; 470 k->cert = NULL; 471 k->ed25519_sk = NULL; 472 k->ed25519_pk = NULL; 473 switch (k->type) { 474 #ifdef WITH_OPENSSL 475 case KEY_RSA1: 476 case KEY_RSA: 477 case KEY_RSA_CERT: 478 if ((rsa = RSA_new()) == NULL || 479 (rsa->n = BN_new()) == NULL || 480 (rsa->e = BN_new()) == NULL) { 481 if (rsa != NULL) 482 RSA_free(rsa); 483 free(k); 484 return NULL; 485 } 486 k->rsa = rsa; 487 break; 488 case KEY_DSA: 489 case KEY_DSA_CERT: 490 if ((dsa = DSA_new()) == NULL || 491 (dsa->p = BN_new()) == NULL || 492 (dsa->q = BN_new()) == NULL || 493 (dsa->g = BN_new()) == NULL || 494 (dsa->pub_key = BN_new()) == NULL) { 495 if (dsa != NULL) 496 DSA_free(dsa); 497 free(k); 498 return NULL; 499 } 500 k->dsa = dsa; 501 break; 502 case KEY_ECDSA: 503 case KEY_ECDSA_CERT: 504 /* Cannot do anything until we know the group */ 505 break; 506 #endif /* WITH_OPENSSL */ 507 case KEY_ED25519: 508 case KEY_ED25519_CERT: 509 /* no need to prealloc */ 510 break; 511 case KEY_UNSPEC: 512 break; 513 default: 514 free(k); 515 return NULL; 516 break; 517 } 518 519 if (sshkey_is_cert(k)) { 520 if ((k->cert = cert_new()) == NULL) { 521 sshkey_free(k); 522 return NULL; 523 } 524 } 525 526 return k; 527 } 528 529 int 530 sshkey_add_private(struct sshkey *k) 531 { 532 switch (k->type) { 533 #ifdef WITH_OPENSSL 534 case KEY_RSA1: 535 case KEY_RSA: 536 case KEY_RSA_CERT: 537 #define bn_maybe_alloc_failed(p) (p == NULL && (p = BN_new()) == NULL) 538 if (bn_maybe_alloc_failed(k->rsa->d) || 539 bn_maybe_alloc_failed(k->rsa->iqmp) || 540 bn_maybe_alloc_failed(k->rsa->q) || 541 bn_maybe_alloc_failed(k->rsa->p) || 542 bn_maybe_alloc_failed(k->rsa->dmq1) || 543 bn_maybe_alloc_failed(k->rsa->dmp1)) 544 return SSH_ERR_ALLOC_FAIL; 545 break; 546 case KEY_DSA: 547 case KEY_DSA_CERT: 548 if (bn_maybe_alloc_failed(k->dsa->priv_key)) 549 return SSH_ERR_ALLOC_FAIL; 550 break; 551 #undef bn_maybe_alloc_failed 552 case KEY_ECDSA: 553 case KEY_ECDSA_CERT: 554 /* Cannot do anything until we know the group */ 555 break; 556 #endif /* WITH_OPENSSL */ 557 case KEY_ED25519: 558 case KEY_ED25519_CERT: 559 /* no need to prealloc */ 560 break; 561 case KEY_UNSPEC: 562 break; 563 default: 564 return SSH_ERR_INVALID_ARGUMENT; 565 } 566 return 0; 567 } 568 569 struct sshkey * 570 sshkey_new_private(int type) 571 { 572 struct sshkey *k = sshkey_new(type); 573 574 if (k == NULL) 575 return NULL; 576 if (sshkey_add_private(k) != 0) { 577 sshkey_free(k); 578 return NULL; 579 } 580 return k; 581 } 582 583 void 584 sshkey_free(struct sshkey *k) 585 { 586 if (k == NULL) 587 return; 588 switch (k->type) { 589 #ifdef WITH_OPENSSL 590 case KEY_RSA1: 591 case KEY_RSA: 592 case KEY_RSA_CERT: 593 if (k->rsa != NULL) 594 RSA_free(k->rsa); 595 k->rsa = NULL; 596 break; 597 case KEY_DSA: 598 case KEY_DSA_CERT: 599 if (k->dsa != NULL) 600 DSA_free(k->dsa); 601 k->dsa = NULL; 602 break; 603 # ifdef OPENSSL_HAS_ECC 604 case KEY_ECDSA: 605 case KEY_ECDSA_CERT: 606 if (k->ecdsa != NULL) 607 EC_KEY_free(k->ecdsa); 608 k->ecdsa = NULL; 609 break; 610 # endif /* OPENSSL_HAS_ECC */ 611 #endif /* WITH_OPENSSL */ 612 case KEY_ED25519: 613 case KEY_ED25519_CERT: 614 if (k->ed25519_pk) { 615 explicit_bzero(k->ed25519_pk, ED25519_PK_SZ); 616 free(k->ed25519_pk); 617 k->ed25519_pk = NULL; 618 } 619 if (k->ed25519_sk) { 620 explicit_bzero(k->ed25519_sk, ED25519_SK_SZ); 621 free(k->ed25519_sk); 622 k->ed25519_sk = NULL; 623 } 624 break; 625 case KEY_UNSPEC: 626 break; 627 default: 628 break; 629 } 630 if (sshkey_is_cert(k)) 631 cert_free(k->cert); 632 explicit_bzero(k, sizeof(*k)); 633 free(k); 634 } 635 636 static int 637 cert_compare(struct sshkey_cert *a, struct sshkey_cert *b) 638 { 639 if (a == NULL && b == NULL) 640 return 1; 641 if (a == NULL || b == NULL) 642 return 0; 643 if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob)) 644 return 0; 645 if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob), 646 sshbuf_len(a->certblob)) != 0) 647 return 0; 648 return 1; 649 } 650 651 /* 652 * Compare public portions of key only, allowing comparisons between 653 * certificates and plain keys too. 654 */ 655 int 656 sshkey_equal_public(const struct sshkey *a, const struct sshkey *b) 657 { 658 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) 659 BN_CTX *bnctx; 660 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */ 661 662 if (a == NULL || b == NULL || 663 sshkey_type_plain(a->type) != sshkey_type_plain(b->type)) 664 return 0; 665 666 switch (a->type) { 667 #ifdef WITH_OPENSSL 668 case KEY_RSA1: 669 case KEY_RSA_CERT: 670 case KEY_RSA: 671 return a->rsa != NULL && b->rsa != NULL && 672 BN_cmp(a->rsa->e, b->rsa->e) == 0 && 673 BN_cmp(a->rsa->n, b->rsa->n) == 0; 674 case KEY_DSA_CERT: 675 case KEY_DSA: 676 return a->dsa != NULL && b->dsa != NULL && 677 BN_cmp(a->dsa->p, b->dsa->p) == 0 && 678 BN_cmp(a->dsa->q, b->dsa->q) == 0 && 679 BN_cmp(a->dsa->g, b->dsa->g) == 0 && 680 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; 681 # ifdef OPENSSL_HAS_ECC 682 case KEY_ECDSA_CERT: 683 case KEY_ECDSA: 684 if (a->ecdsa == NULL || b->ecdsa == NULL || 685 EC_KEY_get0_public_key(a->ecdsa) == NULL || 686 EC_KEY_get0_public_key(b->ecdsa) == NULL) 687 return 0; 688 if ((bnctx = BN_CTX_new()) == NULL) 689 return 0; 690 if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa), 691 EC_KEY_get0_group(b->ecdsa), bnctx) != 0 || 692 EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa), 693 EC_KEY_get0_public_key(a->ecdsa), 694 EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) { 695 BN_CTX_free(bnctx); 696 return 0; 697 } 698 BN_CTX_free(bnctx); 699 return 1; 700 # endif /* OPENSSL_HAS_ECC */ 701 #endif /* WITH_OPENSSL */ 702 case KEY_ED25519: 703 case KEY_ED25519_CERT: 704 return a->ed25519_pk != NULL && b->ed25519_pk != NULL && 705 memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0; 706 default: 707 return 0; 708 } 709 /* NOTREACHED */ 710 } 711 712 int 713 sshkey_equal(const struct sshkey *a, const struct sshkey *b) 714 { 715 if (a == NULL || b == NULL || a->type != b->type) 716 return 0; 717 if (sshkey_is_cert(a)) { 718 if (!cert_compare(a->cert, b->cert)) 719 return 0; 720 } 721 return sshkey_equal_public(a, b); 722 } 723 724 static int 725 to_blob_buf(const struct sshkey *key, struct sshbuf *b, int force_plain) 726 { 727 int type, ret = SSH_ERR_INTERNAL_ERROR; 728 const char *typename; 729 730 if (key == NULL) 731 return SSH_ERR_INVALID_ARGUMENT; 732 733 if (sshkey_is_cert(key)) { 734 if (key->cert == NULL) 735 return SSH_ERR_EXPECTED_CERT; 736 if (sshbuf_len(key->cert->certblob) == 0) 737 return SSH_ERR_KEY_LACKS_CERTBLOB; 738 } 739 type = force_plain ? sshkey_type_plain(key->type) : key->type; 740 typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid); 741 742 switch (type) { 743 #ifdef WITH_OPENSSL 744 case KEY_DSA_CERT: 745 case KEY_ECDSA_CERT: 746 case KEY_RSA_CERT: 747 #endif /* WITH_OPENSSL */ 748 case KEY_ED25519_CERT: 749 /* Use the existing blob */ 750 /* XXX modified flag? */ 751 if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0) 752 return ret; 753 break; 754 #ifdef WITH_OPENSSL 755 case KEY_DSA: 756 if (key->dsa == NULL) 757 return SSH_ERR_INVALID_ARGUMENT; 758 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 759 (ret = sshbuf_put_bignum2(b, key->dsa->p)) != 0 || 760 (ret = sshbuf_put_bignum2(b, key->dsa->q)) != 0 || 761 (ret = sshbuf_put_bignum2(b, key->dsa->g)) != 0 || 762 (ret = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0) 763 return ret; 764 break; 765 # ifdef OPENSSL_HAS_ECC 766 case KEY_ECDSA: 767 if (key->ecdsa == NULL) 768 return SSH_ERR_INVALID_ARGUMENT; 769 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 770 (ret = sshbuf_put_cstring(b, 771 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || 772 (ret = sshbuf_put_eckey(b, key->ecdsa)) != 0) 773 return ret; 774 break; 775 # endif 776 case KEY_RSA: 777 if (key->rsa == NULL) 778 return SSH_ERR_INVALID_ARGUMENT; 779 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 780 (ret = sshbuf_put_bignum2(b, key->rsa->e)) != 0 || 781 (ret = sshbuf_put_bignum2(b, key->rsa->n)) != 0) 782 return ret; 783 break; 784 #endif /* WITH_OPENSSL */ 785 case KEY_ED25519: 786 if (key->ed25519_pk == NULL) 787 return SSH_ERR_INVALID_ARGUMENT; 788 if ((ret = sshbuf_put_cstring(b, typename)) != 0 || 789 (ret = sshbuf_put_string(b, 790 key->ed25519_pk, ED25519_PK_SZ)) != 0) 791 return ret; 792 break; 793 default: 794 return SSH_ERR_KEY_TYPE_UNKNOWN; 795 } 796 return 0; 797 } 798 799 int 800 sshkey_putb(const struct sshkey *key, struct sshbuf *b) 801 { 802 return to_blob_buf(key, b, 0); 803 } 804 805 int 806 sshkey_puts(const struct sshkey *key, struct sshbuf *b) 807 { 808 struct sshbuf *tmp; 809 int r; 810 811 if ((tmp = sshbuf_new()) == NULL) 812 return SSH_ERR_ALLOC_FAIL; 813 r = to_blob_buf(key, tmp, 0); 814 if (r == 0) 815 r = sshbuf_put_stringb(b, tmp); 816 sshbuf_free(tmp); 817 return r; 818 } 819 820 int 821 sshkey_putb_plain(const struct sshkey *key, struct sshbuf *b) 822 { 823 return to_blob_buf(key, b, 1); 824 } 825 826 static int 827 to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp, int force_plain) 828 { 829 int ret = SSH_ERR_INTERNAL_ERROR; 830 size_t len; 831 struct sshbuf *b = NULL; 832 833 if (lenp != NULL) 834 *lenp = 0; 835 if (blobp != NULL) 836 *blobp = NULL; 837 if ((b = sshbuf_new()) == NULL) 838 return SSH_ERR_ALLOC_FAIL; 839 if ((ret = to_blob_buf(key, b, force_plain)) != 0) 840 goto out; 841 len = sshbuf_len(b); 842 if (lenp != NULL) 843 *lenp = len; 844 if (blobp != NULL) { 845 if ((*blobp = malloc(len)) == NULL) { 846 ret = SSH_ERR_ALLOC_FAIL; 847 goto out; 848 } 849 memcpy(*blobp, sshbuf_ptr(b), len); 850 } 851 ret = 0; 852 out: 853 sshbuf_free(b); 854 return ret; 855 } 856 857 int 858 sshkey_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp) 859 { 860 return to_blob(key, blobp, lenp, 0); 861 } 862 863 int 864 sshkey_plain_to_blob(const struct sshkey *key, u_char **blobp, size_t *lenp) 865 { 866 return to_blob(key, blobp, lenp, 1); 867 } 868 869 int 870 sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg, 871 u_char **retp, size_t *lenp) 872 { 873 u_char *blob = NULL, *ret = NULL; 874 size_t blob_len = 0; 875 int r = SSH_ERR_INTERNAL_ERROR; 876 877 if (retp != NULL) 878 *retp = NULL; 879 if (lenp != NULL) 880 *lenp = 0; 881 if (ssh_digest_bytes(dgst_alg) == 0) { 882 r = SSH_ERR_INVALID_ARGUMENT; 883 goto out; 884 } 885 886 if (k->type == KEY_RSA1) { 887 #ifdef WITH_OPENSSL 888 int nlen = BN_num_bytes(k->rsa->n); 889 int elen = BN_num_bytes(k->rsa->e); 890 891 blob_len = nlen + elen; 892 if (nlen >= INT_MAX - elen || 893 (blob = malloc(blob_len)) == NULL) { 894 r = SSH_ERR_ALLOC_FAIL; 895 goto out; 896 } 897 BN_bn2bin(k->rsa->n, blob); 898 BN_bn2bin(k->rsa->e, blob + nlen); 899 #endif /* WITH_OPENSSL */ 900 } else if ((r = to_blob(k, &blob, &blob_len, 1)) != 0) 901 goto out; 902 if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH)) == NULL) { 903 r = SSH_ERR_ALLOC_FAIL; 904 goto out; 905 } 906 if ((r = ssh_digest_memory(dgst_alg, blob, blob_len, 907 ret, SSH_DIGEST_MAX_LENGTH)) != 0) 908 goto out; 909 /* success */ 910 if (retp != NULL) { 911 *retp = ret; 912 ret = NULL; 913 } 914 if (lenp != NULL) 915 *lenp = ssh_digest_bytes(dgst_alg); 916 r = 0; 917 out: 918 free(ret); 919 if (blob != NULL) { 920 explicit_bzero(blob, blob_len); 921 free(blob); 922 } 923 return r; 924 } 925 926 static char * 927 fingerprint_b64(const char *alg, u_char *dgst_raw, size_t dgst_raw_len) 928 { 929 char *ret; 930 size_t plen = strlen(alg) + 1; 931 size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1; 932 int r; 933 934 if (dgst_raw_len > 65536 || (ret = calloc(1, rlen)) == NULL) 935 return NULL; 936 strlcpy(ret, alg, rlen); 937 strlcat(ret, ":", rlen); 938 if (dgst_raw_len == 0) 939 return ret; 940 if ((r = b64_ntop(dgst_raw, dgst_raw_len, 941 ret + plen, rlen - plen)) == -1) { 942 explicit_bzero(ret, rlen); 943 free(ret); 944 return NULL; 945 } 946 /* Trim padding characters from end */ 947 ret[strcspn(ret, "=")] = '\0'; 948 return ret; 949 } 950 951 static char * 952 fingerprint_hex(const char *alg, u_char *dgst_raw, size_t dgst_raw_len) 953 { 954 char *retval, hex[5]; 955 size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2; 956 957 if (dgst_raw_len > 65536 || (retval = calloc(1, rlen)) == NULL) 958 return NULL; 959 strlcpy(retval, alg, rlen); 960 strlcat(retval, ":", rlen); 961 for (i = 0; i < dgst_raw_len; i++) { 962 snprintf(hex, sizeof(hex), "%s%02x", 963 i > 0 ? ":" : "", dgst_raw[i]); 964 strlcat(retval, hex, rlen); 965 } 966 return retval; 967 } 968 969 static char * 970 fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len) 971 { 972 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; 973 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', 974 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; 975 u_int i, j = 0, rounds, seed = 1; 976 char *retval; 977 978 rounds = (dgst_raw_len / 2) + 1; 979 if ((retval = calloc(rounds, 6)) == NULL) 980 return NULL; 981 retval[j++] = 'x'; 982 for (i = 0; i < rounds; i++) { 983 u_int idx0, idx1, idx2, idx3, idx4; 984 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { 985 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + 986 seed) % 6; 987 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; 988 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + 989 (seed / 6)) % 6; 990 retval[j++] = vowels[idx0]; 991 retval[j++] = consonants[idx1]; 992 retval[j++] = vowels[idx2]; 993 if ((i + 1) < rounds) { 994 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; 995 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; 996 retval[j++] = consonants[idx3]; 997 retval[j++] = '-'; 998 retval[j++] = consonants[idx4]; 999 seed = ((seed * 5) + 1000 ((((u_int)(dgst_raw[2 * i])) * 7) + 1001 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; 1002 } 1003 } else { 1004 idx0 = seed % 6; 1005 idx1 = 16; 1006 idx2 = seed / 6; 1007 retval[j++] = vowels[idx0]; 1008 retval[j++] = consonants[idx1]; 1009 retval[j++] = vowels[idx2]; 1010 } 1011 } 1012 retval[j++] = 'x'; 1013 retval[j++] = '\0'; 1014 return retval; 1015 } 1016 1017 /* 1018 * Draw an ASCII-Art representing the fingerprint so human brain can 1019 * profit from its built-in pattern recognition ability. 1020 * This technique is called "random art" and can be found in some 1021 * scientific publications like this original paper: 1022 * 1023 * "Hash Visualization: a New Technique to improve Real-World Security", 1024 * Perrig A. and Song D., 1999, International Workshop on Cryptographic 1025 * Techniques and E-Commerce (CrypTEC '99) 1026 * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf 1027 * 1028 * The subject came up in a talk by Dan Kaminsky, too. 1029 * 1030 * If you see the picture is different, the key is different. 1031 * If the picture looks the same, you still know nothing. 1032 * 1033 * The algorithm used here is a worm crawling over a discrete plane, 1034 * leaving a trace (augmenting the field) everywhere it goes. 1035 * Movement is taken from dgst_raw 2bit-wise. Bumping into walls 1036 * makes the respective movement vector be ignored for this turn. 1037 * Graphs are not unambiguous, because circles in graphs can be 1038 * walked in either direction. 1039 */ 1040 1041 /* 1042 * Field sizes for the random art. Have to be odd, so the starting point 1043 * can be in the exact middle of the picture, and FLDBASE should be >=8 . 1044 * Else pictures would be too dense, and drawing the frame would 1045 * fail, too, because the key type would not fit in anymore. 1046 */ 1047 #define FLDBASE 8 1048 #define FLDSIZE_Y (FLDBASE + 1) 1049 #define FLDSIZE_X (FLDBASE * 2 + 1) 1050 static char * 1051 fingerprint_randomart(const char *alg, u_char *dgst_raw, size_t dgst_raw_len, 1052 const struct sshkey *k) 1053 { 1054 /* 1055 * Chars to be used after each other every time the worm 1056 * intersects with itself. Matter of taste. 1057 */ 1058 char *augmentation_string = " .o+=*BOX@%&#/^SE"; 1059 char *retval, *p, title[FLDSIZE_X], hash[FLDSIZE_X]; 1060 u_char field[FLDSIZE_X][FLDSIZE_Y]; 1061 size_t i, tlen, hlen; 1062 u_int b; 1063 int x, y, r; 1064 size_t len = strlen(augmentation_string) - 1; 1065 1066 if ((retval = calloc((FLDSIZE_X + 3), (FLDSIZE_Y + 2))) == NULL) 1067 return NULL; 1068 1069 /* initialize field */ 1070 memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char)); 1071 x = FLDSIZE_X / 2; 1072 y = FLDSIZE_Y / 2; 1073 1074 /* process raw key */ 1075 for (i = 0; i < dgst_raw_len; i++) { 1076 int input; 1077 /* each byte conveys four 2-bit move commands */ 1078 input = dgst_raw[i]; 1079 for (b = 0; b < 4; b++) { 1080 /* evaluate 2 bit, rest is shifted later */ 1081 x += (input & 0x1) ? 1 : -1; 1082 y += (input & 0x2) ? 1 : -1; 1083 1084 /* assure we are still in bounds */ 1085 x = MAX(x, 0); 1086 y = MAX(y, 0); 1087 x = MIN(x, FLDSIZE_X - 1); 1088 y = MIN(y, FLDSIZE_Y - 1); 1089 1090 /* augment the field */ 1091 if (field[x][y] < len - 2) 1092 field[x][y]++; 1093 input = input >> 2; 1094 } 1095 } 1096 1097 /* mark starting point and end point*/ 1098 field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1; 1099 field[x][y] = len; 1100 1101 /* assemble title */ 1102 r = snprintf(title, sizeof(title), "[%s %u]", 1103 sshkey_type(k), sshkey_size(k)); 1104 /* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */ 1105 if (r < 0 || r > (int)sizeof(title)) 1106 r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k)); 1107 tlen = (r <= 0) ? 0 : strlen(title); 1108 1109 /* assemble hash ID. */ 1110 r = snprintf(hash, sizeof(hash), "[%s]", alg); 1111 hlen = (r <= 0) ? 0 : strlen(hash); 1112 1113 /* output upper border */ 1114 p = retval; 1115 *p++ = '+'; 1116 for (i = 0; i < (FLDSIZE_X - tlen) / 2; i++) 1117 *p++ = '-'; 1118 memcpy(p, title, tlen); 1119 p += tlen; 1120 for (i += tlen; i < FLDSIZE_X; i++) 1121 *p++ = '-'; 1122 *p++ = '+'; 1123 *p++ = '\n'; 1124 1125 /* output content */ 1126 for (y = 0; y < FLDSIZE_Y; y++) { 1127 *p++ = '|'; 1128 for (x = 0; x < FLDSIZE_X; x++) 1129 *p++ = augmentation_string[MIN(field[x][y], len)]; 1130 *p++ = '|'; 1131 *p++ = '\n'; 1132 } 1133 1134 /* output lower border */ 1135 *p++ = '+'; 1136 for (i = 0; i < (FLDSIZE_X - hlen) / 2; i++) 1137 *p++ = '-'; 1138 memcpy(p, hash, hlen); 1139 p += hlen; 1140 for (i += hlen; i < FLDSIZE_X; i++) 1141 *p++ = '-'; 1142 *p++ = '+'; 1143 1144 return retval; 1145 } 1146 1147 char * 1148 sshkey_fingerprint(const struct sshkey *k, int dgst_alg, 1149 enum sshkey_fp_rep dgst_rep) 1150 { 1151 char *retval = NULL; 1152 u_char *dgst_raw; 1153 size_t dgst_raw_len; 1154 1155 if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0) 1156 return NULL; 1157 switch (dgst_rep) { 1158 case SSH_FP_DEFAULT: 1159 if (dgst_alg == SSH_DIGEST_MD5) { 1160 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg), 1161 dgst_raw, dgst_raw_len); 1162 } else { 1163 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg), 1164 dgst_raw, dgst_raw_len); 1165 } 1166 break; 1167 case SSH_FP_HEX: 1168 retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg), 1169 dgst_raw, dgst_raw_len); 1170 break; 1171 case SSH_FP_BASE64: 1172 retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg), 1173 dgst_raw, dgst_raw_len); 1174 break; 1175 case SSH_FP_BUBBLEBABBLE: 1176 retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len); 1177 break; 1178 case SSH_FP_RANDOMART: 1179 retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg), 1180 dgst_raw, dgst_raw_len, k); 1181 break; 1182 default: 1183 explicit_bzero(dgst_raw, dgst_raw_len); 1184 free(dgst_raw); 1185 return NULL; 1186 } 1187 explicit_bzero(dgst_raw, dgst_raw_len); 1188 free(dgst_raw); 1189 return retval; 1190 } 1191 1192 #ifdef WITH_SSH1 1193 /* 1194 * Reads a multiple-precision integer in decimal from the buffer, and advances 1195 * the pointer. The integer must already be initialized. This function is 1196 * permitted to modify the buffer. This leaves *cpp to point just beyond the 1197 * last processed character. 1198 */ 1199 static int 1200 read_decimal_bignum(char **cpp, BIGNUM *v) 1201 { 1202 char *cp; 1203 size_t e; 1204 int skip = 1; /* skip white space */ 1205 1206 cp = *cpp; 1207 while (*cp == ' ' || *cp == '\t') 1208 cp++; 1209 e = strspn(cp, "0123456789"); 1210 if (e == 0) 1211 return SSH_ERR_INVALID_FORMAT; 1212 if (e > SSHBUF_MAX_BIGNUM * 3) 1213 return SSH_ERR_BIGNUM_TOO_LARGE; 1214 if (cp[e] == '\0') 1215 skip = 0; 1216 else if (strchr(" \t\r\n", cp[e]) == NULL) 1217 return SSH_ERR_INVALID_FORMAT; 1218 cp[e] = '\0'; 1219 if (BN_dec2bn(&v, cp) <= 0) 1220 return SSH_ERR_INVALID_FORMAT; 1221 *cpp = cp + e + skip; 1222 return 0; 1223 } 1224 #endif /* WITH_SSH1 */ 1225 1226 /* returns 0 ok, and < 0 error */ 1227 int 1228 sshkey_read(struct sshkey *ret, char **cpp) 1229 { 1230 struct sshkey *k; 1231 int retval = SSH_ERR_INVALID_FORMAT; 1232 char *ep, *cp, *space; 1233 int r, type, curve_nid = -1; 1234 struct sshbuf *blob; 1235 #ifdef WITH_SSH1 1236 u_long bits; 1237 #endif /* WITH_SSH1 */ 1238 1239 cp = *cpp; 1240 1241 switch (ret->type) { 1242 case KEY_RSA1: 1243 #ifdef WITH_SSH1 1244 /* Get number of bits. */ 1245 bits = strtoul(cp, &ep, 10); 1246 if (*cp == '\0' || strchr(" \t\r\n", *ep) == NULL || 1247 bits == 0 || bits > SSHBUF_MAX_BIGNUM * 8) 1248 return SSH_ERR_INVALID_FORMAT; /* Bad bit count... */ 1249 /* Get public exponent, public modulus. */ 1250 if ((r = read_decimal_bignum(&ep, ret->rsa->e)) < 0) 1251 return r; 1252 if ((r = read_decimal_bignum(&ep, ret->rsa->n)) < 0) 1253 return r; 1254 /* validate the claimed number of bits */ 1255 if (BN_num_bits(ret->rsa->n) != (int)bits) 1256 return SSH_ERR_KEY_BITS_MISMATCH; 1257 *cpp = ep; 1258 retval = 0; 1259 #endif /* WITH_SSH1 */ 1260 break; 1261 case KEY_UNSPEC: 1262 case KEY_RSA: 1263 case KEY_DSA: 1264 case KEY_ECDSA: 1265 case KEY_ED25519: 1266 case KEY_DSA_CERT: 1267 case KEY_ECDSA_CERT: 1268 case KEY_RSA_CERT: 1269 case KEY_ED25519_CERT: 1270 space = strchr(cp, ' '); 1271 if (space == NULL) 1272 return SSH_ERR_INVALID_FORMAT; 1273 *space = '\0'; 1274 type = sshkey_type_from_name(cp); 1275 if (sshkey_type_plain(type) == KEY_ECDSA && 1276 (curve_nid = sshkey_ecdsa_nid_from_name(cp)) == -1) 1277 return SSH_ERR_EC_CURVE_INVALID; 1278 *space = ' '; 1279 if (type == KEY_UNSPEC) 1280 return SSH_ERR_INVALID_FORMAT; 1281 cp = space+1; 1282 if (*cp == '\0') 1283 return SSH_ERR_INVALID_FORMAT; 1284 if (ret->type != KEY_UNSPEC && ret->type != type) 1285 return SSH_ERR_KEY_TYPE_MISMATCH; 1286 if ((blob = sshbuf_new()) == NULL) 1287 return SSH_ERR_ALLOC_FAIL; 1288 /* trim comment */ 1289 space = strchr(cp, ' '); 1290 if (space) { 1291 /* advance 'space': skip whitespace */ 1292 *space++ = '\0'; 1293 while (*space == ' ' || *space == '\t') 1294 space++; 1295 ep = space; 1296 } else 1297 ep = cp + strlen(cp); 1298 if ((r = sshbuf_b64tod(blob, cp)) != 0) { 1299 sshbuf_free(blob); 1300 return r; 1301 } 1302 if ((r = sshkey_from_blob(sshbuf_ptr(blob), 1303 sshbuf_len(blob), &k)) != 0) { 1304 sshbuf_free(blob); 1305 return r; 1306 } 1307 sshbuf_free(blob); 1308 if (k->type != type) { 1309 sshkey_free(k); 1310 return SSH_ERR_KEY_TYPE_MISMATCH; 1311 } 1312 if (sshkey_type_plain(type) == KEY_ECDSA && 1313 curve_nid != k->ecdsa_nid) { 1314 sshkey_free(k); 1315 return SSH_ERR_EC_CURVE_MISMATCH; 1316 } 1317 ret->type = type; 1318 if (sshkey_is_cert(ret)) { 1319 if (!sshkey_is_cert(k)) { 1320 sshkey_free(k); 1321 return SSH_ERR_EXPECTED_CERT; 1322 } 1323 if (ret->cert != NULL) 1324 cert_free(ret->cert); 1325 ret->cert = k->cert; 1326 k->cert = NULL; 1327 } 1328 switch (sshkey_type_plain(ret->type)) { 1329 #ifdef WITH_OPENSSL 1330 case KEY_RSA: 1331 if (ret->rsa != NULL) 1332 RSA_free(ret->rsa); 1333 ret->rsa = k->rsa; 1334 k->rsa = NULL; 1335 #ifdef DEBUG_PK 1336 RSA_print_fp(stderr, ret->rsa, 8); 1337 #endif 1338 break; 1339 case KEY_DSA: 1340 if (ret->dsa != NULL) 1341 DSA_free(ret->dsa); 1342 ret->dsa = k->dsa; 1343 k->dsa = NULL; 1344 #ifdef DEBUG_PK 1345 DSA_print_fp(stderr, ret->dsa, 8); 1346 #endif 1347 break; 1348 # ifdef OPENSSL_HAS_ECC 1349 case KEY_ECDSA: 1350 if (ret->ecdsa != NULL) 1351 EC_KEY_free(ret->ecdsa); 1352 ret->ecdsa = k->ecdsa; 1353 ret->ecdsa_nid = k->ecdsa_nid; 1354 k->ecdsa = NULL; 1355 k->ecdsa_nid = -1; 1356 #ifdef DEBUG_PK 1357 sshkey_dump_ec_key(ret->ecdsa); 1358 #endif 1359 break; 1360 # endif /* OPENSSL_HAS_ECC */ 1361 #endif /* WITH_OPENSSL */ 1362 case KEY_ED25519: 1363 free(ret->ed25519_pk); 1364 ret->ed25519_pk = k->ed25519_pk; 1365 k->ed25519_pk = NULL; 1366 #ifdef DEBUG_PK 1367 /* XXX */ 1368 #endif 1369 break; 1370 } 1371 *cpp = ep; 1372 retval = 0; 1373 /*XXXX*/ 1374 sshkey_free(k); 1375 if (retval != 0) 1376 break; 1377 break; 1378 default: 1379 return SSH_ERR_INVALID_ARGUMENT; 1380 } 1381 return retval; 1382 } 1383 1384 int 1385 sshkey_to_base64(const struct sshkey *key, char **b64p) 1386 { 1387 int r = SSH_ERR_INTERNAL_ERROR; 1388 struct sshbuf *b = NULL; 1389 char *uu = NULL; 1390 1391 if (b64p != NULL) 1392 *b64p = NULL; 1393 if ((b = sshbuf_new()) == NULL) 1394 return SSH_ERR_ALLOC_FAIL; 1395 if ((r = sshkey_putb(key, b)) != 0) 1396 goto out; 1397 if ((uu = sshbuf_dtob64(b)) == NULL) { 1398 r = SSH_ERR_ALLOC_FAIL; 1399 goto out; 1400 } 1401 /* Success */ 1402 if (b64p != NULL) { 1403 *b64p = uu; 1404 uu = NULL; 1405 } 1406 r = 0; 1407 out: 1408 sshbuf_free(b); 1409 free(uu); 1410 return r; 1411 } 1412 1413 static int 1414 sshkey_format_rsa1(const struct sshkey *key, struct sshbuf *b) 1415 { 1416 int r = SSH_ERR_INTERNAL_ERROR; 1417 #ifdef WITH_SSH1 1418 u_int bits = 0; 1419 char *dec_e = NULL, *dec_n = NULL; 1420 1421 if (key->rsa == NULL || key->rsa->e == NULL || 1422 key->rsa->n == NULL) { 1423 r = SSH_ERR_INVALID_ARGUMENT; 1424 goto out; 1425 } 1426 if ((dec_e = BN_bn2dec(key->rsa->e)) == NULL || 1427 (dec_n = BN_bn2dec(key->rsa->n)) == NULL) { 1428 r = SSH_ERR_ALLOC_FAIL; 1429 goto out; 1430 } 1431 /* size of modulus 'n' */ 1432 if ((bits = BN_num_bits(key->rsa->n)) <= 0) { 1433 r = SSH_ERR_INVALID_ARGUMENT; 1434 goto out; 1435 } 1436 if ((r = sshbuf_putf(b, "%u %s %s", bits, dec_e, dec_n)) != 0) 1437 goto out; 1438 1439 /* Success */ 1440 r = 0; 1441 out: 1442 if (dec_e != NULL) 1443 OPENSSL_free(dec_e); 1444 if (dec_n != NULL) 1445 OPENSSL_free(dec_n); 1446 #endif /* WITH_SSH1 */ 1447 1448 return r; 1449 } 1450 1451 static int 1452 sshkey_format_text(const struct sshkey *key, struct sshbuf *b) 1453 { 1454 int r = SSH_ERR_INTERNAL_ERROR; 1455 char *uu = NULL; 1456 1457 if (key->type == KEY_RSA1) { 1458 if ((r = sshkey_format_rsa1(key, b)) != 0) 1459 goto out; 1460 } else { 1461 /* Unsupported key types handled in sshkey_to_base64() */ 1462 if ((r = sshkey_to_base64(key, &uu)) != 0) 1463 goto out; 1464 if ((r = sshbuf_putf(b, "%s %s", 1465 sshkey_ssh_name(key), uu)) != 0) 1466 goto out; 1467 } 1468 r = 0; 1469 out: 1470 free(uu); 1471 return r; 1472 } 1473 1474 int 1475 sshkey_write(const struct sshkey *key, FILE *f) 1476 { 1477 struct sshbuf *b = NULL; 1478 int r = SSH_ERR_INTERNAL_ERROR; 1479 1480 if ((b = sshbuf_new()) == NULL) 1481 return SSH_ERR_ALLOC_FAIL; 1482 if ((r = sshkey_format_text(key, b)) != 0) 1483 goto out; 1484 if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) { 1485 if (feof(f)) 1486 errno = EPIPE; 1487 r = SSH_ERR_SYSTEM_ERROR; 1488 goto out; 1489 } 1490 /* Success */ 1491 r = 0; 1492 out: 1493 sshbuf_free(b); 1494 return r; 1495 } 1496 1497 const char * 1498 sshkey_cert_type(const struct sshkey *k) 1499 { 1500 switch (k->cert->type) { 1501 case SSH2_CERT_TYPE_USER: 1502 return "user"; 1503 case SSH2_CERT_TYPE_HOST: 1504 return "host"; 1505 default: 1506 return "unknown"; 1507 } 1508 } 1509 1510 #ifdef WITH_OPENSSL 1511 static int 1512 rsa_generate_private_key(u_int bits, RSA **rsap) 1513 { 1514 RSA *private = NULL; 1515 BIGNUM *f4 = NULL; 1516 int ret = SSH_ERR_INTERNAL_ERROR; 1517 1518 if (rsap == NULL || 1519 bits < SSH_RSA_MINIMUM_MODULUS_SIZE || 1520 bits > SSHBUF_MAX_BIGNUM * 8) 1521 return SSH_ERR_INVALID_ARGUMENT; 1522 *rsap = NULL; 1523 if ((private = RSA_new()) == NULL || (f4 = BN_new()) == NULL) { 1524 ret = SSH_ERR_ALLOC_FAIL; 1525 goto out; 1526 } 1527 if (!BN_set_word(f4, RSA_F4) || 1528 !RSA_generate_key_ex(private, bits, f4, NULL)) { 1529 ret = SSH_ERR_LIBCRYPTO_ERROR; 1530 goto out; 1531 } 1532 *rsap = private; 1533 private = NULL; 1534 ret = 0; 1535 out: 1536 if (private != NULL) 1537 RSA_free(private); 1538 if (f4 != NULL) 1539 BN_free(f4); 1540 return ret; 1541 } 1542 1543 static int 1544 dsa_generate_private_key(u_int bits, DSA **dsap) 1545 { 1546 DSA *private; 1547 int ret = SSH_ERR_INTERNAL_ERROR; 1548 1549 if (dsap == NULL || bits != 1024) 1550 return SSH_ERR_INVALID_ARGUMENT; 1551 if ((private = DSA_new()) == NULL) { 1552 ret = SSH_ERR_ALLOC_FAIL; 1553 goto out; 1554 } 1555 *dsap = NULL; 1556 if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL, 1557 NULL, NULL) || !DSA_generate_key(private)) { 1558 ret = SSH_ERR_LIBCRYPTO_ERROR; 1559 goto out; 1560 } 1561 *dsap = private; 1562 private = NULL; 1563 ret = 0; 1564 out: 1565 if (private != NULL) 1566 DSA_free(private); 1567 return ret; 1568 } 1569 1570 # ifdef OPENSSL_HAS_ECC 1571 int 1572 sshkey_ecdsa_key_to_nid(EC_KEY *k) 1573 { 1574 EC_GROUP *eg; 1575 int nids[] = { 1576 NID_X9_62_prime256v1, 1577 NID_secp384r1, 1578 # ifdef OPENSSL_HAS_NISTP521 1579 NID_secp521r1, 1580 # endif /* OPENSSL_HAS_NISTP521 */ 1581 -1 1582 }; 1583 int nid; 1584 u_int i; 1585 BN_CTX *bnctx; 1586 const EC_GROUP *g = EC_KEY_get0_group(k); 1587 1588 /* 1589 * The group may be stored in a ASN.1 encoded private key in one of two 1590 * ways: as a "named group", which is reconstituted by ASN.1 object ID 1591 * or explicit group parameters encoded into the key blob. Only the 1592 * "named group" case sets the group NID for us, but we can figure 1593 * it out for the other case by comparing against all the groups that 1594 * are supported. 1595 */ 1596 if ((nid = EC_GROUP_get_curve_name(g)) > 0) 1597 return nid; 1598 if ((bnctx = BN_CTX_new()) == NULL) 1599 return -1; 1600 for (i = 0; nids[i] != -1; i++) { 1601 if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL) { 1602 BN_CTX_free(bnctx); 1603 return -1; 1604 } 1605 if (EC_GROUP_cmp(g, eg, bnctx) == 0) 1606 break; 1607 EC_GROUP_free(eg); 1608 } 1609 BN_CTX_free(bnctx); 1610 if (nids[i] != -1) { 1611 /* Use the group with the NID attached */ 1612 EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE); 1613 if (EC_KEY_set_group(k, eg) != 1) { 1614 EC_GROUP_free(eg); 1615 return -1; 1616 } 1617 } 1618 return nids[i]; 1619 } 1620 1621 static int 1622 ecdsa_generate_private_key(u_int bits, int *nid, EC_KEY **ecdsap) 1623 { 1624 EC_KEY *private; 1625 int ret = SSH_ERR_INTERNAL_ERROR; 1626 1627 if (nid == NULL || ecdsap == NULL || 1628 (*nid = sshkey_ecdsa_bits_to_nid(bits)) == -1) 1629 return SSH_ERR_INVALID_ARGUMENT; 1630 *ecdsap = NULL; 1631 if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL) { 1632 ret = SSH_ERR_ALLOC_FAIL; 1633 goto out; 1634 } 1635 if (EC_KEY_generate_key(private) != 1) { 1636 ret = SSH_ERR_LIBCRYPTO_ERROR; 1637 goto out; 1638 } 1639 EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE); 1640 *ecdsap = private; 1641 private = NULL; 1642 ret = 0; 1643 out: 1644 if (private != NULL) 1645 EC_KEY_free(private); 1646 return ret; 1647 } 1648 # endif /* OPENSSL_HAS_ECC */ 1649 #endif /* WITH_OPENSSL */ 1650 1651 int 1652 sshkey_generate(int type, u_int bits, struct sshkey **keyp) 1653 { 1654 struct sshkey *k; 1655 int ret = SSH_ERR_INTERNAL_ERROR; 1656 1657 if (keyp == NULL) 1658 return SSH_ERR_INVALID_ARGUMENT; 1659 *keyp = NULL; 1660 if ((k = sshkey_new(KEY_UNSPEC)) == NULL) 1661 return SSH_ERR_ALLOC_FAIL; 1662 switch (type) { 1663 case KEY_ED25519: 1664 if ((k->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL || 1665 (k->ed25519_sk = malloc(ED25519_SK_SZ)) == NULL) { 1666 ret = SSH_ERR_ALLOC_FAIL; 1667 break; 1668 } 1669 crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk); 1670 ret = 0; 1671 break; 1672 #ifdef WITH_OPENSSL 1673 case KEY_DSA: 1674 ret = dsa_generate_private_key(bits, &k->dsa); 1675 break; 1676 # ifdef OPENSSL_HAS_ECC 1677 case KEY_ECDSA: 1678 ret = ecdsa_generate_private_key(bits, &k->ecdsa_nid, 1679 &k->ecdsa); 1680 break; 1681 # endif /* OPENSSL_HAS_ECC */ 1682 case KEY_RSA: 1683 case KEY_RSA1: 1684 ret = rsa_generate_private_key(bits, &k->rsa); 1685 break; 1686 #endif /* WITH_OPENSSL */ 1687 default: 1688 ret = SSH_ERR_INVALID_ARGUMENT; 1689 } 1690 if (ret == 0) { 1691 k->type = type; 1692 *keyp = k; 1693 } else 1694 sshkey_free(k); 1695 return ret; 1696 } 1697 1698 int 1699 sshkey_cert_copy(const struct sshkey *from_key, struct sshkey *to_key) 1700 { 1701 u_int i; 1702 const struct sshkey_cert *from; 1703 struct sshkey_cert *to; 1704 int ret = SSH_ERR_INTERNAL_ERROR; 1705 1706 if (to_key->cert != NULL) { 1707 cert_free(to_key->cert); 1708 to_key->cert = NULL; 1709 } 1710 1711 if ((from = from_key->cert) == NULL) 1712 return SSH_ERR_INVALID_ARGUMENT; 1713 1714 if ((to = to_key->cert = cert_new()) == NULL) 1715 return SSH_ERR_ALLOC_FAIL; 1716 1717 if ((ret = sshbuf_putb(to->certblob, from->certblob)) != 0 || 1718 (ret = sshbuf_putb(to->critical, from->critical)) != 0 || 1719 (ret = sshbuf_putb(to->extensions, from->extensions)) != 0) 1720 return ret; 1721 1722 to->serial = from->serial; 1723 to->type = from->type; 1724 if (from->key_id == NULL) 1725 to->key_id = NULL; 1726 else if ((to->key_id = strdup(from->key_id)) == NULL) 1727 return SSH_ERR_ALLOC_FAIL; 1728 to->valid_after = from->valid_after; 1729 to->valid_before = from->valid_before; 1730 if (from->signature_key == NULL) 1731 to->signature_key = NULL; 1732 else if ((ret = sshkey_from_private(from->signature_key, 1733 &to->signature_key)) != 0) 1734 return ret; 1735 1736 if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS) 1737 return SSH_ERR_INVALID_ARGUMENT; 1738 if (from->nprincipals > 0) { 1739 if ((to->principals = calloc(from->nprincipals, 1740 sizeof(*to->principals))) == NULL) 1741 return SSH_ERR_ALLOC_FAIL; 1742 for (i = 0; i < from->nprincipals; i++) { 1743 to->principals[i] = strdup(from->principals[i]); 1744 if (to->principals[i] == NULL) { 1745 to->nprincipals = i; 1746 return SSH_ERR_ALLOC_FAIL; 1747 } 1748 } 1749 } 1750 to->nprincipals = from->nprincipals; 1751 return 0; 1752 } 1753 1754 int 1755 sshkey_from_private(const struct sshkey *k, struct sshkey **pkp) 1756 { 1757 struct sshkey *n = NULL; 1758 int ret = SSH_ERR_INTERNAL_ERROR; 1759 1760 *pkp = NULL; 1761 switch (k->type) { 1762 #ifdef WITH_OPENSSL 1763 case KEY_DSA: 1764 case KEY_DSA_CERT: 1765 if ((n = sshkey_new(k->type)) == NULL) 1766 return SSH_ERR_ALLOC_FAIL; 1767 if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) || 1768 (BN_copy(n->dsa->q, k->dsa->q) == NULL) || 1769 (BN_copy(n->dsa->g, k->dsa->g) == NULL) || 1770 (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) { 1771 sshkey_free(n); 1772 return SSH_ERR_ALLOC_FAIL; 1773 } 1774 break; 1775 # ifdef OPENSSL_HAS_ECC 1776 case KEY_ECDSA: 1777 case KEY_ECDSA_CERT: 1778 if ((n = sshkey_new(k->type)) == NULL) 1779 return SSH_ERR_ALLOC_FAIL; 1780 n->ecdsa_nid = k->ecdsa_nid; 1781 n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); 1782 if (n->ecdsa == NULL) { 1783 sshkey_free(n); 1784 return SSH_ERR_ALLOC_FAIL; 1785 } 1786 if (EC_KEY_set_public_key(n->ecdsa, 1787 EC_KEY_get0_public_key(k->ecdsa)) != 1) { 1788 sshkey_free(n); 1789 return SSH_ERR_LIBCRYPTO_ERROR; 1790 } 1791 break; 1792 # endif /* OPENSSL_HAS_ECC */ 1793 case KEY_RSA: 1794 case KEY_RSA1: 1795 case KEY_RSA_CERT: 1796 if ((n = sshkey_new(k->type)) == NULL) 1797 return SSH_ERR_ALLOC_FAIL; 1798 if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) || 1799 (BN_copy(n->rsa->e, k->rsa->e) == NULL)) { 1800 sshkey_free(n); 1801 return SSH_ERR_ALLOC_FAIL; 1802 } 1803 break; 1804 #endif /* WITH_OPENSSL */ 1805 case KEY_ED25519: 1806 case KEY_ED25519_CERT: 1807 if ((n = sshkey_new(k->type)) == NULL) 1808 return SSH_ERR_ALLOC_FAIL; 1809 if (k->ed25519_pk != NULL) { 1810 if ((n->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) { 1811 sshkey_free(n); 1812 return SSH_ERR_ALLOC_FAIL; 1813 } 1814 memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ); 1815 } 1816 break; 1817 default: 1818 return SSH_ERR_KEY_TYPE_UNKNOWN; 1819 } 1820 if (sshkey_is_cert(k)) { 1821 if ((ret = sshkey_cert_copy(k, n)) != 0) { 1822 sshkey_free(n); 1823 return ret; 1824 } 1825 } 1826 *pkp = n; 1827 return 0; 1828 } 1829 1830 static int 1831 cert_parse(struct sshbuf *b, struct sshkey *key, struct sshbuf *certbuf) 1832 { 1833 struct sshbuf *principals = NULL, *crit = NULL; 1834 struct sshbuf *exts = NULL, *ca = NULL; 1835 u_char *sig = NULL; 1836 size_t signed_len = 0, slen = 0, kidlen = 0; 1837 int ret = SSH_ERR_INTERNAL_ERROR; 1838 1839 /* Copy the entire key blob for verification and later serialisation */ 1840 if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0) 1841 return ret; 1842 1843 /* Parse body of certificate up to signature */ 1844 if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 || 1845 (ret = sshbuf_get_u32(b, &key->cert->type)) != 0 || 1846 (ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 || 1847 (ret = sshbuf_froms(b, &principals)) != 0 || 1848 (ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 || 1849 (ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 || 1850 (ret = sshbuf_froms(b, &crit)) != 0 || 1851 (ret = sshbuf_froms(b, &exts)) != 0 || 1852 (ret = sshbuf_get_string_direct(b, NULL, NULL)) != 0 || 1853 (ret = sshbuf_froms(b, &ca)) != 0) { 1854 /* XXX debug print error for ret */ 1855 ret = SSH_ERR_INVALID_FORMAT; 1856 goto out; 1857 } 1858 1859 /* Signature is left in the buffer so we can calculate this length */ 1860 signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b); 1861 1862 if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) { 1863 ret = SSH_ERR_INVALID_FORMAT; 1864 goto out; 1865 } 1866 1867 if (key->cert->type != SSH2_CERT_TYPE_USER && 1868 key->cert->type != SSH2_CERT_TYPE_HOST) { 1869 ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE; 1870 goto out; 1871 } 1872 1873 /* Parse principals section */ 1874 while (sshbuf_len(principals) > 0) { 1875 char *principal = NULL; 1876 char **oprincipals = NULL; 1877 1878 if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS) { 1879 ret = SSH_ERR_INVALID_FORMAT; 1880 goto out; 1881 } 1882 if ((ret = sshbuf_get_cstring(principals, &principal, 1883 NULL)) != 0) { 1884 ret = SSH_ERR_INVALID_FORMAT; 1885 goto out; 1886 } 1887 oprincipals = key->cert->principals; 1888 key->cert->principals = reallocarray(key->cert->principals, 1889 key->cert->nprincipals + 1, sizeof(*key->cert->principals)); 1890 if (key->cert->principals == NULL) { 1891 free(principal); 1892 key->cert->principals = oprincipals; 1893 ret = SSH_ERR_ALLOC_FAIL; 1894 goto out; 1895 } 1896 key->cert->principals[key->cert->nprincipals++] = principal; 1897 } 1898 1899 /* 1900 * Stash a copies of the critical options and extensions sections 1901 * for later use. 1902 */ 1903 if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 || 1904 (exts != NULL && 1905 (ret = sshbuf_putb(key->cert->extensions, exts)) != 0)) 1906 goto out; 1907 1908 /* 1909 * Validate critical options and extensions sections format. 1910 */ 1911 while (sshbuf_len(crit) != 0) { 1912 if ((ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0 || 1913 (ret = sshbuf_get_string_direct(crit, NULL, NULL)) != 0) { 1914 sshbuf_reset(key->cert->critical); 1915 ret = SSH_ERR_INVALID_FORMAT; 1916 goto out; 1917 } 1918 } 1919 while (exts != NULL && sshbuf_len(exts) != 0) { 1920 if ((ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0 || 1921 (ret = sshbuf_get_string_direct(exts, NULL, NULL)) != 0) { 1922 sshbuf_reset(key->cert->extensions); 1923 ret = SSH_ERR_INVALID_FORMAT; 1924 goto out; 1925 } 1926 } 1927 1928 /* Parse CA key and check signature */ 1929 if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) { 1930 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 1931 goto out; 1932 } 1933 if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) { 1934 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 1935 goto out; 1936 } 1937 if ((ret = sshkey_verify(key->cert->signature_key, sig, slen, 1938 sshbuf_ptr(key->cert->certblob), signed_len, 0)) != 0) 1939 goto out; 1940 1941 /* Success */ 1942 ret = 0; 1943 out: 1944 sshbuf_free(ca); 1945 sshbuf_free(crit); 1946 sshbuf_free(exts); 1947 sshbuf_free(principals); 1948 free(sig); 1949 return ret; 1950 } 1951 1952 static int 1953 sshkey_from_blob_internal(struct sshbuf *b, struct sshkey **keyp, 1954 int allow_cert) 1955 { 1956 int type, ret = SSH_ERR_INTERNAL_ERROR; 1957 char *ktype = NULL, *curve = NULL; 1958 struct sshkey *key = NULL; 1959 size_t len; 1960 u_char *pk = NULL; 1961 struct sshbuf *copy; 1962 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) 1963 EC_POINT *q = NULL; 1964 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */ 1965 1966 #ifdef DEBUG_PK /* XXX */ 1967 sshbuf_dump(b, stderr); 1968 #endif 1969 *keyp = NULL; 1970 if ((copy = sshbuf_fromb(b)) == NULL) { 1971 ret = SSH_ERR_ALLOC_FAIL; 1972 goto out; 1973 } 1974 if (sshbuf_get_cstring(b, &ktype, NULL) != 0) { 1975 ret = SSH_ERR_INVALID_FORMAT; 1976 goto out; 1977 } 1978 1979 type = sshkey_type_from_name(ktype); 1980 if (!allow_cert && sshkey_type_is_cert(type)) { 1981 ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 1982 goto out; 1983 } 1984 switch (type) { 1985 #ifdef WITH_OPENSSL 1986 case KEY_RSA_CERT: 1987 /* Skip nonce */ 1988 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 1989 ret = SSH_ERR_INVALID_FORMAT; 1990 goto out; 1991 } 1992 /* FALLTHROUGH */ 1993 case KEY_RSA: 1994 if ((key = sshkey_new(type)) == NULL) { 1995 ret = SSH_ERR_ALLOC_FAIL; 1996 goto out; 1997 } 1998 if (sshbuf_get_bignum2(b, key->rsa->e) != 0 || 1999 sshbuf_get_bignum2(b, key->rsa->n) != 0) { 2000 ret = SSH_ERR_INVALID_FORMAT; 2001 goto out; 2002 } 2003 #ifdef DEBUG_PK 2004 RSA_print_fp(stderr, key->rsa, 8); 2005 #endif 2006 break; 2007 case KEY_DSA_CERT: 2008 /* Skip nonce */ 2009 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 2010 ret = SSH_ERR_INVALID_FORMAT; 2011 goto out; 2012 } 2013 /* FALLTHROUGH */ 2014 case KEY_DSA: 2015 if ((key = sshkey_new(type)) == NULL) { 2016 ret = SSH_ERR_ALLOC_FAIL; 2017 goto out; 2018 } 2019 if (sshbuf_get_bignum2(b, key->dsa->p) != 0 || 2020 sshbuf_get_bignum2(b, key->dsa->q) != 0 || 2021 sshbuf_get_bignum2(b, key->dsa->g) != 0 || 2022 sshbuf_get_bignum2(b, key->dsa->pub_key) != 0) { 2023 ret = SSH_ERR_INVALID_FORMAT; 2024 goto out; 2025 } 2026 #ifdef DEBUG_PK 2027 DSA_print_fp(stderr, key->dsa, 8); 2028 #endif 2029 break; 2030 case KEY_ECDSA_CERT: 2031 /* Skip nonce */ 2032 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 2033 ret = SSH_ERR_INVALID_FORMAT; 2034 goto out; 2035 } 2036 /* FALLTHROUGH */ 2037 # ifdef OPENSSL_HAS_ECC 2038 case KEY_ECDSA: 2039 if ((key = sshkey_new(type)) == NULL) { 2040 ret = SSH_ERR_ALLOC_FAIL; 2041 goto out; 2042 } 2043 key->ecdsa_nid = sshkey_ecdsa_nid_from_name(ktype); 2044 if (sshbuf_get_cstring(b, &curve, NULL) != 0) { 2045 ret = SSH_ERR_INVALID_FORMAT; 2046 goto out; 2047 } 2048 if (key->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { 2049 ret = SSH_ERR_EC_CURVE_MISMATCH; 2050 goto out; 2051 } 2052 if (key->ecdsa != NULL) 2053 EC_KEY_free(key->ecdsa); 2054 if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid)) 2055 == NULL) { 2056 ret = SSH_ERR_EC_CURVE_INVALID; 2057 goto out; 2058 } 2059 if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL) { 2060 ret = SSH_ERR_ALLOC_FAIL; 2061 goto out; 2062 } 2063 if (sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa)) != 0) { 2064 ret = SSH_ERR_INVALID_FORMAT; 2065 goto out; 2066 } 2067 if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa), 2068 q) != 0) { 2069 ret = SSH_ERR_KEY_INVALID_EC_VALUE; 2070 goto out; 2071 } 2072 if (EC_KEY_set_public_key(key->ecdsa, q) != 1) { 2073 /* XXX assume it is a allocation error */ 2074 ret = SSH_ERR_ALLOC_FAIL; 2075 goto out; 2076 } 2077 #ifdef DEBUG_PK 2078 sshkey_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q); 2079 #endif 2080 break; 2081 # endif /* OPENSSL_HAS_ECC */ 2082 #endif /* WITH_OPENSSL */ 2083 case KEY_ED25519_CERT: 2084 /* Skip nonce */ 2085 if (sshbuf_get_string_direct(b, NULL, NULL) != 0) { 2086 ret = SSH_ERR_INVALID_FORMAT; 2087 goto out; 2088 } 2089 /* FALLTHROUGH */ 2090 case KEY_ED25519: 2091 if ((ret = sshbuf_get_string(b, &pk, &len)) != 0) 2092 goto out; 2093 if (len != ED25519_PK_SZ) { 2094 ret = SSH_ERR_INVALID_FORMAT; 2095 goto out; 2096 } 2097 if ((key = sshkey_new(type)) == NULL) { 2098 ret = SSH_ERR_ALLOC_FAIL; 2099 goto out; 2100 } 2101 key->ed25519_pk = pk; 2102 pk = NULL; 2103 break; 2104 case KEY_UNSPEC: 2105 if ((key = sshkey_new(type)) == NULL) { 2106 ret = SSH_ERR_ALLOC_FAIL; 2107 goto out; 2108 } 2109 break; 2110 default: 2111 ret = SSH_ERR_KEY_TYPE_UNKNOWN; 2112 goto out; 2113 } 2114 2115 /* Parse certificate potion */ 2116 if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0) 2117 goto out; 2118 2119 if (key != NULL && sshbuf_len(b) != 0) { 2120 ret = SSH_ERR_INVALID_FORMAT; 2121 goto out; 2122 } 2123 ret = 0; 2124 *keyp = key; 2125 key = NULL; 2126 out: 2127 sshbuf_free(copy); 2128 sshkey_free(key); 2129 free(ktype); 2130 free(curve); 2131 free(pk); 2132 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) 2133 if (q != NULL) 2134 EC_POINT_free(q); 2135 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */ 2136 return ret; 2137 } 2138 2139 int 2140 sshkey_from_blob(const u_char *blob, size_t blen, struct sshkey **keyp) 2141 { 2142 struct sshbuf *b; 2143 int r; 2144 2145 if ((b = sshbuf_from(blob, blen)) == NULL) 2146 return SSH_ERR_ALLOC_FAIL; 2147 r = sshkey_from_blob_internal(b, keyp, 1); 2148 sshbuf_free(b); 2149 return r; 2150 } 2151 2152 int 2153 sshkey_fromb(struct sshbuf *b, struct sshkey **keyp) 2154 { 2155 return sshkey_from_blob_internal(b, keyp, 1); 2156 } 2157 2158 int 2159 sshkey_froms(struct sshbuf *buf, struct sshkey **keyp) 2160 { 2161 struct sshbuf *b; 2162 int r; 2163 2164 if ((r = sshbuf_froms(buf, &b)) != 0) 2165 return r; 2166 r = sshkey_from_blob_internal(b, keyp, 1); 2167 sshbuf_free(b); 2168 return r; 2169 } 2170 2171 int 2172 sshkey_sign(const struct sshkey *key, 2173 u_char **sigp, size_t *lenp, 2174 const u_char *data, size_t datalen, const char *alg, u_int compat) 2175 { 2176 if (sigp != NULL) 2177 *sigp = NULL; 2178 if (lenp != NULL) 2179 *lenp = 0; 2180 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE) 2181 return SSH_ERR_INVALID_ARGUMENT; 2182 switch (key->type) { 2183 #ifdef WITH_OPENSSL 2184 case KEY_DSA_CERT: 2185 case KEY_DSA: 2186 return ssh_dss_sign(key, sigp, lenp, data, datalen, compat); 2187 # ifdef OPENSSL_HAS_ECC 2188 case KEY_ECDSA_CERT: 2189 case KEY_ECDSA: 2190 return ssh_ecdsa_sign(key, sigp, lenp, data, datalen, compat); 2191 # endif /* OPENSSL_HAS_ECC */ 2192 case KEY_RSA_CERT: 2193 case KEY_RSA: 2194 return ssh_rsa_sign(key, sigp, lenp, data, datalen, alg); 2195 #endif /* WITH_OPENSSL */ 2196 case KEY_ED25519: 2197 case KEY_ED25519_CERT: 2198 return ssh_ed25519_sign(key, sigp, lenp, data, datalen, compat); 2199 default: 2200 return SSH_ERR_KEY_TYPE_UNKNOWN; 2201 } 2202 } 2203 2204 /* 2205 * ssh_key_verify returns 0 for a correct signature and < 0 on error. 2206 */ 2207 int 2208 sshkey_verify(const struct sshkey *key, 2209 const u_char *sig, size_t siglen, 2210 const u_char *data, size_t dlen, u_int compat) 2211 { 2212 if (siglen == 0 || dlen > SSH_KEY_MAX_SIGN_DATA_SIZE) 2213 return SSH_ERR_INVALID_ARGUMENT; 2214 switch (key->type) { 2215 #ifdef WITH_OPENSSL 2216 case KEY_DSA_CERT: 2217 case KEY_DSA: 2218 return ssh_dss_verify(key, sig, siglen, data, dlen, compat); 2219 # ifdef OPENSSL_HAS_ECC 2220 case KEY_ECDSA_CERT: 2221 case KEY_ECDSA: 2222 return ssh_ecdsa_verify(key, sig, siglen, data, dlen, compat); 2223 # endif /* OPENSSL_HAS_ECC */ 2224 case KEY_RSA_CERT: 2225 case KEY_RSA: 2226 return ssh_rsa_verify(key, sig, siglen, data, dlen); 2227 #endif /* WITH_OPENSSL */ 2228 case KEY_ED25519: 2229 case KEY_ED25519_CERT: 2230 return ssh_ed25519_verify(key, sig, siglen, data, dlen, compat); 2231 default: 2232 return SSH_ERR_KEY_TYPE_UNKNOWN; 2233 } 2234 } 2235 2236 /* Converts a private to a public key */ 2237 int 2238 sshkey_demote(const struct sshkey *k, struct sshkey **dkp) 2239 { 2240 struct sshkey *pk; 2241 int ret = SSH_ERR_INTERNAL_ERROR; 2242 2243 *dkp = NULL; 2244 if ((pk = calloc(1, sizeof(*pk))) == NULL) 2245 return SSH_ERR_ALLOC_FAIL; 2246 pk->type = k->type; 2247 pk->flags = k->flags; 2248 pk->ecdsa_nid = k->ecdsa_nid; 2249 pk->dsa = NULL; 2250 pk->ecdsa = NULL; 2251 pk->rsa = NULL; 2252 pk->ed25519_pk = NULL; 2253 pk->ed25519_sk = NULL; 2254 2255 switch (k->type) { 2256 #ifdef WITH_OPENSSL 2257 case KEY_RSA_CERT: 2258 if ((ret = sshkey_cert_copy(k, pk)) != 0) 2259 goto fail; 2260 /* FALLTHROUGH */ 2261 case KEY_RSA1: 2262 case KEY_RSA: 2263 if ((pk->rsa = RSA_new()) == NULL || 2264 (pk->rsa->e = BN_dup(k->rsa->e)) == NULL || 2265 (pk->rsa->n = BN_dup(k->rsa->n)) == NULL) { 2266 ret = SSH_ERR_ALLOC_FAIL; 2267 goto fail; 2268 } 2269 break; 2270 case KEY_DSA_CERT: 2271 if ((ret = sshkey_cert_copy(k, pk)) != 0) 2272 goto fail; 2273 /* FALLTHROUGH */ 2274 case KEY_DSA: 2275 if ((pk->dsa = DSA_new()) == NULL || 2276 (pk->dsa->p = BN_dup(k->dsa->p)) == NULL || 2277 (pk->dsa->q = BN_dup(k->dsa->q)) == NULL || 2278 (pk->dsa->g = BN_dup(k->dsa->g)) == NULL || 2279 (pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) { 2280 ret = SSH_ERR_ALLOC_FAIL; 2281 goto fail; 2282 } 2283 break; 2284 case KEY_ECDSA_CERT: 2285 if ((ret = sshkey_cert_copy(k, pk)) != 0) 2286 goto fail; 2287 /* FALLTHROUGH */ 2288 # ifdef OPENSSL_HAS_ECC 2289 case KEY_ECDSA: 2290 pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid); 2291 if (pk->ecdsa == NULL) { 2292 ret = SSH_ERR_ALLOC_FAIL; 2293 goto fail; 2294 } 2295 if (EC_KEY_set_public_key(pk->ecdsa, 2296 EC_KEY_get0_public_key(k->ecdsa)) != 1) { 2297 ret = SSH_ERR_LIBCRYPTO_ERROR; 2298 goto fail; 2299 } 2300 break; 2301 # endif /* OPENSSL_HAS_ECC */ 2302 #endif /* WITH_OPENSSL */ 2303 case KEY_ED25519_CERT: 2304 if ((ret = sshkey_cert_copy(k, pk)) != 0) 2305 goto fail; 2306 /* FALLTHROUGH */ 2307 case KEY_ED25519: 2308 if (k->ed25519_pk != NULL) { 2309 if ((pk->ed25519_pk = malloc(ED25519_PK_SZ)) == NULL) { 2310 ret = SSH_ERR_ALLOC_FAIL; 2311 goto fail; 2312 } 2313 memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ); 2314 } 2315 break; 2316 default: 2317 ret = SSH_ERR_KEY_TYPE_UNKNOWN; 2318 fail: 2319 sshkey_free(pk); 2320 return ret; 2321 } 2322 *dkp = pk; 2323 return 0; 2324 } 2325 2326 /* Convert a plain key to their _CERT equivalent */ 2327 int 2328 sshkey_to_certified(struct sshkey *k) 2329 { 2330 int newtype; 2331 2332 switch (k->type) { 2333 #ifdef WITH_OPENSSL 2334 case KEY_RSA: 2335 newtype = KEY_RSA_CERT; 2336 break; 2337 case KEY_DSA: 2338 newtype = KEY_DSA_CERT; 2339 break; 2340 case KEY_ECDSA: 2341 newtype = KEY_ECDSA_CERT; 2342 break; 2343 #endif /* WITH_OPENSSL */ 2344 case KEY_ED25519: 2345 newtype = KEY_ED25519_CERT; 2346 break; 2347 default: 2348 return SSH_ERR_INVALID_ARGUMENT; 2349 } 2350 if ((k->cert = cert_new()) == NULL) 2351 return SSH_ERR_ALLOC_FAIL; 2352 k->type = newtype; 2353 return 0; 2354 } 2355 2356 /* Convert a certificate to its raw key equivalent */ 2357 int 2358 sshkey_drop_cert(struct sshkey *k) 2359 { 2360 if (!sshkey_type_is_cert(k->type)) 2361 return SSH_ERR_KEY_TYPE_UNKNOWN; 2362 cert_free(k->cert); 2363 k->cert = NULL; 2364 k->type = sshkey_type_plain(k->type); 2365 return 0; 2366 } 2367 2368 /* Sign a certified key, (re-)generating the signed certblob. */ 2369 int 2370 sshkey_certify(struct sshkey *k, struct sshkey *ca) 2371 { 2372 struct sshbuf *principals = NULL; 2373 u_char *ca_blob = NULL, *sig_blob = NULL, nonce[32]; 2374 size_t i, ca_len, sig_len; 2375 int ret = SSH_ERR_INTERNAL_ERROR; 2376 struct sshbuf *cert; 2377 2378 if (k == NULL || k->cert == NULL || 2379 k->cert->certblob == NULL || ca == NULL) 2380 return SSH_ERR_INVALID_ARGUMENT; 2381 if (!sshkey_is_cert(k)) 2382 return SSH_ERR_KEY_TYPE_UNKNOWN; 2383 if (!sshkey_type_is_valid_ca(ca->type)) 2384 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 2385 2386 if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0) 2387 return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY; 2388 2389 cert = k->cert->certblob; /* for readability */ 2390 sshbuf_reset(cert); 2391 if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0) 2392 goto out; 2393 2394 /* -v01 certs put nonce first */ 2395 arc4random_buf(&nonce, sizeof(nonce)); 2396 if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0) 2397 goto out; 2398 2399 /* XXX this substantially duplicates to_blob(); refactor */ 2400 switch (k->type) { 2401 #ifdef WITH_OPENSSL 2402 case KEY_DSA_CERT: 2403 if ((ret = sshbuf_put_bignum2(cert, k->dsa->p)) != 0 || 2404 (ret = sshbuf_put_bignum2(cert, k->dsa->q)) != 0 || 2405 (ret = sshbuf_put_bignum2(cert, k->dsa->g)) != 0 || 2406 (ret = sshbuf_put_bignum2(cert, k->dsa->pub_key)) != 0) 2407 goto out; 2408 break; 2409 # ifdef OPENSSL_HAS_ECC 2410 case KEY_ECDSA_CERT: 2411 if ((ret = sshbuf_put_cstring(cert, 2412 sshkey_curve_nid_to_name(k->ecdsa_nid))) != 0 || 2413 (ret = sshbuf_put_ec(cert, 2414 EC_KEY_get0_public_key(k->ecdsa), 2415 EC_KEY_get0_group(k->ecdsa))) != 0) 2416 goto out; 2417 break; 2418 # endif /* OPENSSL_HAS_ECC */ 2419 case KEY_RSA_CERT: 2420 if ((ret = sshbuf_put_bignum2(cert, k->rsa->e)) != 0 || 2421 (ret = sshbuf_put_bignum2(cert, k->rsa->n)) != 0) 2422 goto out; 2423 break; 2424 #endif /* WITH_OPENSSL */ 2425 case KEY_ED25519_CERT: 2426 if ((ret = sshbuf_put_string(cert, 2427 k->ed25519_pk, ED25519_PK_SZ)) != 0) 2428 goto out; 2429 break; 2430 default: 2431 ret = SSH_ERR_INVALID_ARGUMENT; 2432 goto out; 2433 } 2434 2435 if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 || 2436 (ret = sshbuf_put_u32(cert, k->cert->type)) != 0 || 2437 (ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0) 2438 goto out; 2439 2440 if ((principals = sshbuf_new()) == NULL) { 2441 ret = SSH_ERR_ALLOC_FAIL; 2442 goto out; 2443 } 2444 for (i = 0; i < k->cert->nprincipals; i++) { 2445 if ((ret = sshbuf_put_cstring(principals, 2446 k->cert->principals[i])) != 0) 2447 goto out; 2448 } 2449 if ((ret = sshbuf_put_stringb(cert, principals)) != 0 || 2450 (ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 || 2451 (ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 || 2452 (ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 || 2453 (ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 || 2454 (ret = sshbuf_put_string(cert, NULL, 0)) != 0 || /* Reserved */ 2455 (ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0) 2456 goto out; 2457 2458 /* Sign the whole mess */ 2459 if ((ret = sshkey_sign(ca, &sig_blob, &sig_len, sshbuf_ptr(cert), 2460 sshbuf_len(cert), NULL, 0)) != 0) 2461 goto out; 2462 2463 /* Append signature and we are done */ 2464 if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0) 2465 goto out; 2466 ret = 0; 2467 out: 2468 if (ret != 0) 2469 sshbuf_reset(cert); 2470 free(sig_blob); 2471 free(ca_blob); 2472 sshbuf_free(principals); 2473 return ret; 2474 } 2475 2476 int 2477 sshkey_cert_check_authority(const struct sshkey *k, 2478 int want_host, int require_principal, 2479 const char *name, const char **reason) 2480 { 2481 u_int i, principal_matches; 2482 time_t now = time(NULL); 2483 2484 if (reason != NULL) 2485 *reason = NULL; 2486 2487 if (want_host) { 2488 if (k->cert->type != SSH2_CERT_TYPE_HOST) { 2489 *reason = "Certificate invalid: not a host certificate"; 2490 return SSH_ERR_KEY_CERT_INVALID; 2491 } 2492 } else { 2493 if (k->cert->type != SSH2_CERT_TYPE_USER) { 2494 *reason = "Certificate invalid: not a user certificate"; 2495 return SSH_ERR_KEY_CERT_INVALID; 2496 } 2497 } 2498 if (now < 0) { 2499 /* yikes - system clock before epoch! */ 2500 *reason = "Certificate invalid: not yet valid"; 2501 return SSH_ERR_KEY_CERT_INVALID; 2502 } 2503 if ((u_int64_t)now < k->cert->valid_after) { 2504 *reason = "Certificate invalid: not yet valid"; 2505 return SSH_ERR_KEY_CERT_INVALID; 2506 } 2507 if ((u_int64_t)now >= k->cert->valid_before) { 2508 *reason = "Certificate invalid: expired"; 2509 return SSH_ERR_KEY_CERT_INVALID; 2510 } 2511 if (k->cert->nprincipals == 0) { 2512 if (require_principal) { 2513 *reason = "Certificate lacks principal list"; 2514 return SSH_ERR_KEY_CERT_INVALID; 2515 } 2516 } else if (name != NULL) { 2517 principal_matches = 0; 2518 for (i = 0; i < k->cert->nprincipals; i++) { 2519 if (strcmp(name, k->cert->principals[i]) == 0) { 2520 principal_matches = 1; 2521 break; 2522 } 2523 } 2524 if (!principal_matches) { 2525 *reason = "Certificate invalid: name is not a listed " 2526 "principal"; 2527 return SSH_ERR_KEY_CERT_INVALID; 2528 } 2529 } 2530 return 0; 2531 } 2532 2533 size_t 2534 sshkey_format_cert_validity(const struct sshkey_cert *cert, char *s, size_t l) 2535 { 2536 char from[32], to[32], ret[64]; 2537 time_t tt; 2538 struct tm *tm; 2539 2540 *from = *to = '\0'; 2541 if (cert->valid_after == 0 && 2542 cert->valid_before == 0xffffffffffffffffULL) 2543 return strlcpy(s, "forever", l); 2544 2545 if (cert->valid_after != 0) { 2546 /* XXX revisit INT_MAX in 2038 :) */ 2547 tt = cert->valid_after > INT_MAX ? 2548 INT_MAX : cert->valid_after; 2549 tm = localtime(&tt); 2550 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm); 2551 } 2552 if (cert->valid_before != 0xffffffffffffffffULL) { 2553 /* XXX revisit INT_MAX in 2038 :) */ 2554 tt = cert->valid_before > INT_MAX ? 2555 INT_MAX : cert->valid_before; 2556 tm = localtime(&tt); 2557 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm); 2558 } 2559 2560 if (cert->valid_after == 0) 2561 snprintf(ret, sizeof(ret), "before %s", to); 2562 else if (cert->valid_before == 0xffffffffffffffffULL) 2563 snprintf(ret, sizeof(ret), "after %s", from); 2564 else 2565 snprintf(ret, sizeof(ret), "from %s to %s", from, to); 2566 2567 return strlcpy(s, ret, l); 2568 } 2569 2570 int 2571 sshkey_private_serialize(const struct sshkey *key, struct sshbuf *b) 2572 { 2573 int r = SSH_ERR_INTERNAL_ERROR; 2574 2575 if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0) 2576 goto out; 2577 switch (key->type) { 2578 #ifdef WITH_OPENSSL 2579 case KEY_RSA: 2580 if ((r = sshbuf_put_bignum2(b, key->rsa->n)) != 0 || 2581 (r = sshbuf_put_bignum2(b, key->rsa->e)) != 0 || 2582 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 || 2583 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 || 2584 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 || 2585 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0) 2586 goto out; 2587 break; 2588 case KEY_RSA_CERT: 2589 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 2590 r = SSH_ERR_INVALID_ARGUMENT; 2591 goto out; 2592 } 2593 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 2594 (r = sshbuf_put_bignum2(b, key->rsa->d)) != 0 || 2595 (r = sshbuf_put_bignum2(b, key->rsa->iqmp)) != 0 || 2596 (r = sshbuf_put_bignum2(b, key->rsa->p)) != 0 || 2597 (r = sshbuf_put_bignum2(b, key->rsa->q)) != 0) 2598 goto out; 2599 break; 2600 case KEY_DSA: 2601 if ((r = sshbuf_put_bignum2(b, key->dsa->p)) != 0 || 2602 (r = sshbuf_put_bignum2(b, key->dsa->q)) != 0 || 2603 (r = sshbuf_put_bignum2(b, key->dsa->g)) != 0 || 2604 (r = sshbuf_put_bignum2(b, key->dsa->pub_key)) != 0 || 2605 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0) 2606 goto out; 2607 break; 2608 case KEY_DSA_CERT: 2609 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 2610 r = SSH_ERR_INVALID_ARGUMENT; 2611 goto out; 2612 } 2613 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 2614 (r = sshbuf_put_bignum2(b, key->dsa->priv_key)) != 0) 2615 goto out; 2616 break; 2617 # ifdef OPENSSL_HAS_ECC 2618 case KEY_ECDSA: 2619 if ((r = sshbuf_put_cstring(b, 2620 sshkey_curve_nid_to_name(key->ecdsa_nid))) != 0 || 2621 (r = sshbuf_put_eckey(b, key->ecdsa)) != 0 || 2622 (r = sshbuf_put_bignum2(b, 2623 EC_KEY_get0_private_key(key->ecdsa))) != 0) 2624 goto out; 2625 break; 2626 case KEY_ECDSA_CERT: 2627 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 2628 r = SSH_ERR_INVALID_ARGUMENT; 2629 goto out; 2630 } 2631 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 2632 (r = sshbuf_put_bignum2(b, 2633 EC_KEY_get0_private_key(key->ecdsa))) != 0) 2634 goto out; 2635 break; 2636 # endif /* OPENSSL_HAS_ECC */ 2637 #endif /* WITH_OPENSSL */ 2638 case KEY_ED25519: 2639 if ((r = sshbuf_put_string(b, key->ed25519_pk, 2640 ED25519_PK_SZ)) != 0 || 2641 (r = sshbuf_put_string(b, key->ed25519_sk, 2642 ED25519_SK_SZ)) != 0) 2643 goto out; 2644 break; 2645 case KEY_ED25519_CERT: 2646 if (key->cert == NULL || sshbuf_len(key->cert->certblob) == 0) { 2647 r = SSH_ERR_INVALID_ARGUMENT; 2648 goto out; 2649 } 2650 if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0 || 2651 (r = sshbuf_put_string(b, key->ed25519_pk, 2652 ED25519_PK_SZ)) != 0 || 2653 (r = sshbuf_put_string(b, key->ed25519_sk, 2654 ED25519_SK_SZ)) != 0) 2655 goto out; 2656 break; 2657 default: 2658 r = SSH_ERR_INVALID_ARGUMENT; 2659 goto out; 2660 } 2661 /* success */ 2662 r = 0; 2663 out: 2664 return r; 2665 } 2666 2667 int 2668 sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp) 2669 { 2670 char *tname = NULL, *curve = NULL; 2671 struct sshkey *k = NULL; 2672 size_t pklen = 0, sklen = 0; 2673 int type, r = SSH_ERR_INTERNAL_ERROR; 2674 u_char *ed25519_pk = NULL, *ed25519_sk = NULL; 2675 #ifdef WITH_OPENSSL 2676 BIGNUM *exponent = NULL; 2677 #endif /* WITH_OPENSSL */ 2678 2679 if (kp != NULL) 2680 *kp = NULL; 2681 if ((r = sshbuf_get_cstring(buf, &tname, NULL)) != 0) 2682 goto out; 2683 type = sshkey_type_from_name(tname); 2684 switch (type) { 2685 #ifdef WITH_OPENSSL 2686 case KEY_DSA: 2687 if ((k = sshkey_new_private(type)) == NULL) { 2688 r = SSH_ERR_ALLOC_FAIL; 2689 goto out; 2690 } 2691 if ((r = sshbuf_get_bignum2(buf, k->dsa->p)) != 0 || 2692 (r = sshbuf_get_bignum2(buf, k->dsa->q)) != 0 || 2693 (r = sshbuf_get_bignum2(buf, k->dsa->g)) != 0 || 2694 (r = sshbuf_get_bignum2(buf, k->dsa->pub_key)) != 0 || 2695 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0) 2696 goto out; 2697 break; 2698 case KEY_DSA_CERT: 2699 if ((r = sshkey_froms(buf, &k)) != 0 || 2700 (r = sshkey_add_private(k)) != 0 || 2701 (r = sshbuf_get_bignum2(buf, k->dsa->priv_key)) != 0) 2702 goto out; 2703 break; 2704 # ifdef OPENSSL_HAS_ECC 2705 case KEY_ECDSA: 2706 if ((k = sshkey_new_private(type)) == NULL) { 2707 r = SSH_ERR_ALLOC_FAIL; 2708 goto out; 2709 } 2710 if ((k->ecdsa_nid = sshkey_ecdsa_nid_from_name(tname)) == -1) { 2711 r = SSH_ERR_INVALID_ARGUMENT; 2712 goto out; 2713 } 2714 if ((r = sshbuf_get_cstring(buf, &curve, NULL)) != 0) 2715 goto out; 2716 if (k->ecdsa_nid != sshkey_curve_name_to_nid(curve)) { 2717 r = SSH_ERR_EC_CURVE_MISMATCH; 2718 goto out; 2719 } 2720 k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid); 2721 if (k->ecdsa == NULL || (exponent = BN_new()) == NULL) { 2722 r = SSH_ERR_LIBCRYPTO_ERROR; 2723 goto out; 2724 } 2725 if ((r = sshbuf_get_eckey(buf, k->ecdsa)) != 0 || 2726 (r = sshbuf_get_bignum2(buf, exponent))) 2727 goto out; 2728 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) { 2729 r = SSH_ERR_LIBCRYPTO_ERROR; 2730 goto out; 2731 } 2732 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa), 2733 EC_KEY_get0_public_key(k->ecdsa))) != 0 || 2734 (r = sshkey_ec_validate_private(k->ecdsa)) != 0) 2735 goto out; 2736 break; 2737 case KEY_ECDSA_CERT: 2738 if ((exponent = BN_new()) == NULL) { 2739 r = SSH_ERR_LIBCRYPTO_ERROR; 2740 goto out; 2741 } 2742 if ((r = sshkey_froms(buf, &k)) != 0 || 2743 (r = sshkey_add_private(k)) != 0 || 2744 (r = sshbuf_get_bignum2(buf, exponent)) != 0) 2745 goto out; 2746 if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1) { 2747 r = SSH_ERR_LIBCRYPTO_ERROR; 2748 goto out; 2749 } 2750 if ((r = sshkey_ec_validate_public(EC_KEY_get0_group(k->ecdsa), 2751 EC_KEY_get0_public_key(k->ecdsa))) != 0 || 2752 (r = sshkey_ec_validate_private(k->ecdsa)) != 0) 2753 goto out; 2754 break; 2755 # endif /* OPENSSL_HAS_ECC */ 2756 case KEY_RSA: 2757 if ((k = sshkey_new_private(type)) == NULL) { 2758 r = SSH_ERR_ALLOC_FAIL; 2759 goto out; 2760 } 2761 if ((r = sshbuf_get_bignum2(buf, k->rsa->n)) != 0 || 2762 (r = sshbuf_get_bignum2(buf, k->rsa->e)) != 0 || 2763 (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 || 2764 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 || 2765 (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 || 2766 (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 || 2767 (r = rsa_generate_additional_parameters(k->rsa)) != 0) 2768 goto out; 2769 break; 2770 case KEY_RSA_CERT: 2771 if ((r = sshkey_froms(buf, &k)) != 0 || 2772 (r = sshkey_add_private(k)) != 0 || 2773 (r = sshbuf_get_bignum2(buf, k->rsa->d)) != 0 || 2774 (r = sshbuf_get_bignum2(buf, k->rsa->iqmp)) != 0 || 2775 (r = sshbuf_get_bignum2(buf, k->rsa->p)) != 0 || 2776 (r = sshbuf_get_bignum2(buf, k->rsa->q)) != 0 || 2777 (r = rsa_generate_additional_parameters(k->rsa)) != 0) 2778 goto out; 2779 break; 2780 #endif /* WITH_OPENSSL */ 2781 case KEY_ED25519: 2782 if ((k = sshkey_new_private(type)) == NULL) { 2783 r = SSH_ERR_ALLOC_FAIL; 2784 goto out; 2785 } 2786 if ((r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 || 2787 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0) 2788 goto out; 2789 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) { 2790 r = SSH_ERR_INVALID_FORMAT; 2791 goto out; 2792 } 2793 k->ed25519_pk = ed25519_pk; 2794 k->ed25519_sk = ed25519_sk; 2795 ed25519_pk = ed25519_sk = NULL; 2796 break; 2797 case KEY_ED25519_CERT: 2798 if ((r = sshkey_froms(buf, &k)) != 0 || 2799 (r = sshkey_add_private(k)) != 0 || 2800 (r = sshbuf_get_string(buf, &ed25519_pk, &pklen)) != 0 || 2801 (r = sshbuf_get_string(buf, &ed25519_sk, &sklen)) != 0) 2802 goto out; 2803 if (pklen != ED25519_PK_SZ || sklen != ED25519_SK_SZ) { 2804 r = SSH_ERR_INVALID_FORMAT; 2805 goto out; 2806 } 2807 k->ed25519_pk = ed25519_pk; 2808 k->ed25519_sk = ed25519_sk; 2809 ed25519_pk = ed25519_sk = NULL; 2810 break; 2811 default: 2812 r = SSH_ERR_KEY_TYPE_UNKNOWN; 2813 goto out; 2814 } 2815 #ifdef WITH_OPENSSL 2816 /* enable blinding */ 2817 switch (k->type) { 2818 case KEY_RSA: 2819 case KEY_RSA_CERT: 2820 case KEY_RSA1: 2821 if (RSA_blinding_on(k->rsa, NULL) != 1) { 2822 r = SSH_ERR_LIBCRYPTO_ERROR; 2823 goto out; 2824 } 2825 break; 2826 } 2827 #endif /* WITH_OPENSSL */ 2828 /* success */ 2829 r = 0; 2830 if (kp != NULL) { 2831 *kp = k; 2832 k = NULL; 2833 } 2834 out: 2835 free(tname); 2836 free(curve); 2837 #ifdef WITH_OPENSSL 2838 if (exponent != NULL) 2839 BN_clear_free(exponent); 2840 #endif /* WITH_OPENSSL */ 2841 sshkey_free(k); 2842 if (ed25519_pk != NULL) { 2843 explicit_bzero(ed25519_pk, pklen); 2844 free(ed25519_pk); 2845 } 2846 if (ed25519_sk != NULL) { 2847 explicit_bzero(ed25519_sk, sklen); 2848 free(ed25519_sk); 2849 } 2850 return r; 2851 } 2852 2853 #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) 2854 int 2855 sshkey_ec_validate_public(const EC_GROUP *group, const EC_POINT *public) 2856 { 2857 BN_CTX *bnctx; 2858 EC_POINT *nq = NULL; 2859 BIGNUM *order, *x, *y, *tmp; 2860 int ret = SSH_ERR_KEY_INVALID_EC_VALUE; 2861 2862 if ((bnctx = BN_CTX_new()) == NULL) 2863 return SSH_ERR_ALLOC_FAIL; 2864 BN_CTX_start(bnctx); 2865 2866 /* 2867 * We shouldn't ever hit this case because bignum_get_ecpoint() 2868 * refuses to load GF2m points. 2869 */ 2870 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != 2871 NID_X9_62_prime_field) 2872 goto out; 2873 2874 /* Q != infinity */ 2875 if (EC_POINT_is_at_infinity(group, public)) 2876 goto out; 2877 2878 if ((x = BN_CTX_get(bnctx)) == NULL || 2879 (y = BN_CTX_get(bnctx)) == NULL || 2880 (order = BN_CTX_get(bnctx)) == NULL || 2881 (tmp = BN_CTX_get(bnctx)) == NULL) { 2882 ret = SSH_ERR_ALLOC_FAIL; 2883 goto out; 2884 } 2885 2886 /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */ 2887 if (EC_GROUP_get_order(group, order, bnctx) != 1 || 2888 EC_POINT_get_affine_coordinates_GFp(group, public, 2889 x, y, bnctx) != 1) { 2890 ret = SSH_ERR_LIBCRYPTO_ERROR; 2891 goto out; 2892 } 2893 if (BN_num_bits(x) <= BN_num_bits(order) / 2 || 2894 BN_num_bits(y) <= BN_num_bits(order) / 2) 2895 goto out; 2896 2897 /* nQ == infinity (n == order of subgroup) */ 2898 if ((nq = EC_POINT_new(group)) == NULL) { 2899 ret = SSH_ERR_ALLOC_FAIL; 2900 goto out; 2901 } 2902 if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1) { 2903 ret = SSH_ERR_LIBCRYPTO_ERROR; 2904 goto out; 2905 } 2906 if (EC_POINT_is_at_infinity(group, nq) != 1) 2907 goto out; 2908 2909 /* x < order - 1, y < order - 1 */ 2910 if (!BN_sub(tmp, order, BN_value_one())) { 2911 ret = SSH_ERR_LIBCRYPTO_ERROR; 2912 goto out; 2913 } 2914 if (BN_cmp(x, tmp) >= 0 || BN_cmp(y, tmp) >= 0) 2915 goto out; 2916 ret = 0; 2917 out: 2918 BN_CTX_free(bnctx); 2919 if (nq != NULL) 2920 EC_POINT_free(nq); 2921 return ret; 2922 } 2923 2924 int 2925 sshkey_ec_validate_private(const EC_KEY *key) 2926 { 2927 BN_CTX *bnctx; 2928 BIGNUM *order, *tmp; 2929 int ret = SSH_ERR_KEY_INVALID_EC_VALUE; 2930 2931 if ((bnctx = BN_CTX_new()) == NULL) 2932 return SSH_ERR_ALLOC_FAIL; 2933 BN_CTX_start(bnctx); 2934 2935 if ((order = BN_CTX_get(bnctx)) == NULL || 2936 (tmp = BN_CTX_get(bnctx)) == NULL) { 2937 ret = SSH_ERR_ALLOC_FAIL; 2938 goto out; 2939 } 2940 2941 /* log2(private) > log2(order)/2 */ 2942 if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1) { 2943 ret = SSH_ERR_LIBCRYPTO_ERROR; 2944 goto out; 2945 } 2946 if (BN_num_bits(EC_KEY_get0_private_key(key)) <= 2947 BN_num_bits(order) / 2) 2948 goto out; 2949 2950 /* private < order - 1 */ 2951 if (!BN_sub(tmp, order, BN_value_one())) { 2952 ret = SSH_ERR_LIBCRYPTO_ERROR; 2953 goto out; 2954 } 2955 if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0) 2956 goto out; 2957 ret = 0; 2958 out: 2959 BN_CTX_free(bnctx); 2960 return ret; 2961 } 2962 2963 void 2964 sshkey_dump_ec_point(const EC_GROUP *group, const EC_POINT *point) 2965 { 2966 BIGNUM *x, *y; 2967 BN_CTX *bnctx; 2968 2969 if (point == NULL) { 2970 fputs("point=(NULL)\n", stderr); 2971 return; 2972 } 2973 if ((bnctx = BN_CTX_new()) == NULL) { 2974 fprintf(stderr, "%s: BN_CTX_new failed\n", __func__); 2975 return; 2976 } 2977 BN_CTX_start(bnctx); 2978 if ((x = BN_CTX_get(bnctx)) == NULL || 2979 (y = BN_CTX_get(bnctx)) == NULL) { 2980 fprintf(stderr, "%s: BN_CTX_get failed\n", __func__); 2981 return; 2982 } 2983 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != 2984 NID_X9_62_prime_field) { 2985 fprintf(stderr, "%s: group is not a prime field\n", __func__); 2986 return; 2987 } 2988 if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y, 2989 bnctx) != 1) { 2990 fprintf(stderr, "%s: EC_POINT_get_affine_coordinates_GFp\n", 2991 __func__); 2992 return; 2993 } 2994 fputs("x=", stderr); 2995 BN_print_fp(stderr, x); 2996 fputs("\ny=", stderr); 2997 BN_print_fp(stderr, y); 2998 fputs("\n", stderr); 2999 BN_CTX_free(bnctx); 3000 } 3001 3002 void 3003 sshkey_dump_ec_key(const EC_KEY *key) 3004 { 3005 const BIGNUM *exponent; 3006 3007 sshkey_dump_ec_point(EC_KEY_get0_group(key), 3008 EC_KEY_get0_public_key(key)); 3009 fputs("exponent=", stderr); 3010 if ((exponent = EC_KEY_get0_private_key(key)) == NULL) 3011 fputs("(NULL)", stderr); 3012 else 3013 BN_print_fp(stderr, EC_KEY_get0_private_key(key)); 3014 fputs("\n", stderr); 3015 } 3016 #endif /* WITH_OPENSSL && OPENSSL_HAS_ECC */ 3017 3018 static int 3019 sshkey_private_to_blob2(const struct sshkey *prv, struct sshbuf *blob, 3020 const char *passphrase, const char *comment, const char *ciphername, 3021 int rounds) 3022 { 3023 u_char *cp, *key = NULL, *pubkeyblob = NULL; 3024 u_char salt[SALT_LEN]; 3025 char *b64 = NULL; 3026 size_t i, pubkeylen, keylen, ivlen, blocksize, authlen; 3027 u_int check; 3028 int r = SSH_ERR_INTERNAL_ERROR; 3029 struct sshcipher_ctx ciphercontext; 3030 const struct sshcipher *cipher; 3031 const char *kdfname = KDFNAME; 3032 struct sshbuf *encoded = NULL, *encrypted = NULL, *kdf = NULL; 3033 3034 memset(&ciphercontext, 0, sizeof(ciphercontext)); 3035 3036 if (rounds <= 0) 3037 rounds = DEFAULT_ROUNDS; 3038 if (passphrase == NULL || !strlen(passphrase)) { 3039 ciphername = "none"; 3040 kdfname = "none"; 3041 } else if (ciphername == NULL) 3042 ciphername = DEFAULT_CIPHERNAME; 3043 else if (cipher_number(ciphername) != SSH_CIPHER_SSH2) { 3044 r = SSH_ERR_INVALID_ARGUMENT; 3045 goto out; 3046 } 3047 if ((cipher = cipher_by_name(ciphername)) == NULL) { 3048 r = SSH_ERR_INTERNAL_ERROR; 3049 goto out; 3050 } 3051 3052 if ((kdf = sshbuf_new()) == NULL || 3053 (encoded = sshbuf_new()) == NULL || 3054 (encrypted = sshbuf_new()) == NULL) { 3055 r = SSH_ERR_ALLOC_FAIL; 3056 goto out; 3057 } 3058 blocksize = cipher_blocksize(cipher); 3059 keylen = cipher_keylen(cipher); 3060 ivlen = cipher_ivlen(cipher); 3061 authlen = cipher_authlen(cipher); 3062 if ((key = calloc(1, keylen + ivlen)) == NULL) { 3063 r = SSH_ERR_ALLOC_FAIL; 3064 goto out; 3065 } 3066 if (strcmp(kdfname, "bcrypt") == 0) { 3067 arc4random_buf(salt, SALT_LEN); 3068 if (bcrypt_pbkdf(passphrase, strlen(passphrase), 3069 salt, SALT_LEN, key, keylen + ivlen, rounds) < 0) { 3070 r = SSH_ERR_INVALID_ARGUMENT; 3071 goto out; 3072 } 3073 if ((r = sshbuf_put_string(kdf, salt, SALT_LEN)) != 0 || 3074 (r = sshbuf_put_u32(kdf, rounds)) != 0) 3075 goto out; 3076 } else if (strcmp(kdfname, "none") != 0) { 3077 /* Unsupported KDF type */ 3078 r = SSH_ERR_KEY_UNKNOWN_CIPHER; 3079 goto out; 3080 } 3081 if ((r = cipher_init(&ciphercontext, cipher, key, keylen, 3082 key + keylen, ivlen, 1)) != 0) 3083 goto out; 3084 3085 if ((r = sshbuf_put(encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC))) != 0 || 3086 (r = sshbuf_put_cstring(encoded, ciphername)) != 0 || 3087 (r = sshbuf_put_cstring(encoded, kdfname)) != 0 || 3088 (r = sshbuf_put_stringb(encoded, kdf)) != 0 || 3089 (r = sshbuf_put_u32(encoded, 1)) != 0 || /* number of keys */ 3090 (r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 || 3091 (r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0) 3092 goto out; 3093 3094 /* set up the buffer that will be encrypted */ 3095 3096 /* Random check bytes */ 3097 check = arc4random(); 3098 if ((r = sshbuf_put_u32(encrypted, check)) != 0 || 3099 (r = sshbuf_put_u32(encrypted, check)) != 0) 3100 goto out; 3101 3102 /* append private key and comment*/ 3103 if ((r = sshkey_private_serialize(prv, encrypted)) != 0 || 3104 (r = sshbuf_put_cstring(encrypted, comment)) != 0) 3105 goto out; 3106 3107 /* padding */ 3108 i = 0; 3109 while (sshbuf_len(encrypted) % blocksize) { 3110 if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0) 3111 goto out; 3112 } 3113 3114 /* length in destination buffer */ 3115 if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0) 3116 goto out; 3117 3118 /* encrypt */ 3119 if ((r = sshbuf_reserve(encoded, 3120 sshbuf_len(encrypted) + authlen, &cp)) != 0) 3121 goto out; 3122 if ((r = cipher_crypt(&ciphercontext, 0, cp, 3123 sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0) 3124 goto out; 3125 3126 /* uuencode */ 3127 if ((b64 = sshbuf_dtob64(encoded)) == NULL) { 3128 r = SSH_ERR_ALLOC_FAIL; 3129 goto out; 3130 } 3131 3132 sshbuf_reset(blob); 3133 if ((r = sshbuf_put(blob, MARK_BEGIN, MARK_BEGIN_LEN)) != 0) 3134 goto out; 3135 for (i = 0; i < strlen(b64); i++) { 3136 if ((r = sshbuf_put_u8(blob, b64[i])) != 0) 3137 goto out; 3138 /* insert line breaks */ 3139 if (i % 70 == 69 && (r = sshbuf_put_u8(blob, '\n')) != 0) 3140 goto out; 3141 } 3142 if (i % 70 != 69 && (r = sshbuf_put_u8(blob, '\n')) != 0) 3143 goto out; 3144 if ((r = sshbuf_put(blob, MARK_END, MARK_END_LEN)) != 0) 3145 goto out; 3146 3147 /* success */ 3148 r = 0; 3149 3150 out: 3151 sshbuf_free(kdf); 3152 sshbuf_free(encoded); 3153 sshbuf_free(encrypted); 3154 cipher_cleanup(&ciphercontext); 3155 explicit_bzero(salt, sizeof(salt)); 3156 if (key != NULL) { 3157 explicit_bzero(key, keylen + ivlen); 3158 free(key); 3159 } 3160 if (pubkeyblob != NULL) { 3161 explicit_bzero(pubkeyblob, pubkeylen); 3162 free(pubkeyblob); 3163 } 3164 if (b64 != NULL) { 3165 explicit_bzero(b64, strlen(b64)); 3166 free(b64); 3167 } 3168 return r; 3169 } 3170 3171 static int 3172 sshkey_parse_private2(struct sshbuf *blob, int type, const char *passphrase, 3173 struct sshkey **keyp, char **commentp) 3174 { 3175 char *comment = NULL, *ciphername = NULL, *kdfname = NULL; 3176 const struct sshcipher *cipher = NULL; 3177 const u_char *cp; 3178 int r = SSH_ERR_INTERNAL_ERROR; 3179 size_t encoded_len; 3180 size_t i, keylen = 0, ivlen = 0, authlen = 0, slen = 0; 3181 struct sshbuf *encoded = NULL, *decoded = NULL; 3182 struct sshbuf *kdf = NULL, *decrypted = NULL; 3183 struct sshcipher_ctx ciphercontext; 3184 struct sshkey *k = NULL; 3185 u_char *key = NULL, *salt = NULL, *dp, pad, last; 3186 u_int blocksize, rounds, nkeys, encrypted_len, check1, check2; 3187 3188 memset(&ciphercontext, 0, sizeof(ciphercontext)); 3189 if (keyp != NULL) 3190 *keyp = NULL; 3191 if (commentp != NULL) 3192 *commentp = NULL; 3193 3194 if ((encoded = sshbuf_new()) == NULL || 3195 (decoded = sshbuf_new()) == NULL || 3196 (decrypted = sshbuf_new()) == NULL) { 3197 r = SSH_ERR_ALLOC_FAIL; 3198 goto out; 3199 } 3200 3201 /* check preamble */ 3202 cp = sshbuf_ptr(blob); 3203 encoded_len = sshbuf_len(blob); 3204 if (encoded_len < (MARK_BEGIN_LEN + MARK_END_LEN) || 3205 memcmp(cp, MARK_BEGIN, MARK_BEGIN_LEN) != 0) { 3206 r = SSH_ERR_INVALID_FORMAT; 3207 goto out; 3208 } 3209 cp += MARK_BEGIN_LEN; 3210 encoded_len -= MARK_BEGIN_LEN; 3211 3212 /* Look for end marker, removing whitespace as we go */ 3213 while (encoded_len > 0) { 3214 if (*cp != '\n' && *cp != '\r') { 3215 if ((r = sshbuf_put_u8(encoded, *cp)) != 0) 3216 goto out; 3217 } 3218 last = *cp; 3219 encoded_len--; 3220 cp++; 3221 if (last == '\n') { 3222 if (encoded_len >= MARK_END_LEN && 3223 memcmp(cp, MARK_END, MARK_END_LEN) == 0) { 3224 /* \0 terminate */ 3225 if ((r = sshbuf_put_u8(encoded, 0)) != 0) 3226 goto out; 3227 break; 3228 } 3229 } 3230 } 3231 if (encoded_len == 0) { 3232 r = SSH_ERR_INVALID_FORMAT; 3233 goto out; 3234 } 3235 3236 /* decode base64 */ 3237 if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0) 3238 goto out; 3239 3240 /* check magic */ 3241 if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC) || 3242 memcmp(sshbuf_ptr(decoded), AUTH_MAGIC, sizeof(AUTH_MAGIC))) { 3243 r = SSH_ERR_INVALID_FORMAT; 3244 goto out; 3245 } 3246 /* parse public portion of key */ 3247 if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC))) != 0 || 3248 (r = sshbuf_get_cstring(decoded, &ciphername, NULL)) != 0 || 3249 (r = sshbuf_get_cstring(decoded, &kdfname, NULL)) != 0 || 3250 (r = sshbuf_froms(decoded, &kdf)) != 0 || 3251 (r = sshbuf_get_u32(decoded, &nkeys)) != 0 || 3252 (r = sshbuf_skip_string(decoded)) != 0 || /* pubkey */ 3253 (r = sshbuf_get_u32(decoded, &encrypted_len)) != 0) 3254 goto out; 3255 3256 if ((cipher = cipher_by_name(ciphername)) == NULL) { 3257 r = SSH_ERR_KEY_UNKNOWN_CIPHER; 3258 goto out; 3259 } 3260 if ((passphrase == NULL || strlen(passphrase) == 0) && 3261 strcmp(ciphername, "none") != 0) { 3262 /* passphrase required */ 3263 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 3264 goto out; 3265 } 3266 if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) { 3267 r = SSH_ERR_KEY_UNKNOWN_CIPHER; 3268 goto out; 3269 } 3270 if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) { 3271 r = SSH_ERR_INVALID_FORMAT; 3272 goto out; 3273 } 3274 if (nkeys != 1) { 3275 /* XXX only one key supported */ 3276 r = SSH_ERR_INVALID_FORMAT; 3277 goto out; 3278 } 3279 3280 /* check size of encrypted key blob */ 3281 blocksize = cipher_blocksize(cipher); 3282 if (encrypted_len < blocksize || (encrypted_len % blocksize) != 0) { 3283 r = SSH_ERR_INVALID_FORMAT; 3284 goto out; 3285 } 3286 3287 /* setup key */ 3288 keylen = cipher_keylen(cipher); 3289 ivlen = cipher_ivlen(cipher); 3290 authlen = cipher_authlen(cipher); 3291 if ((key = calloc(1, keylen + ivlen)) == NULL) { 3292 r = SSH_ERR_ALLOC_FAIL; 3293 goto out; 3294 } 3295 if (strcmp(kdfname, "bcrypt") == 0) { 3296 if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 || 3297 (r = sshbuf_get_u32(kdf, &rounds)) != 0) 3298 goto out; 3299 if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen, 3300 key, keylen + ivlen, rounds) < 0) { 3301 r = SSH_ERR_INVALID_FORMAT; 3302 goto out; 3303 } 3304 } 3305 3306 /* check that an appropriate amount of auth data is present */ 3307 if (sshbuf_len(decoded) < encrypted_len + authlen) { 3308 r = SSH_ERR_INVALID_FORMAT; 3309 goto out; 3310 } 3311 3312 /* decrypt private portion of key */ 3313 if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 || 3314 (r = cipher_init(&ciphercontext, cipher, key, keylen, 3315 key + keylen, ivlen, 0)) != 0) 3316 goto out; 3317 if ((r = cipher_crypt(&ciphercontext, 0, dp, sshbuf_ptr(decoded), 3318 encrypted_len, 0, authlen)) != 0) { 3319 /* an integrity error here indicates an incorrect passphrase */ 3320 if (r == SSH_ERR_MAC_INVALID) 3321 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 3322 goto out; 3323 } 3324 if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0) 3325 goto out; 3326 /* there should be no trailing data */ 3327 if (sshbuf_len(decoded) != 0) { 3328 r = SSH_ERR_INVALID_FORMAT; 3329 goto out; 3330 } 3331 3332 /* check check bytes */ 3333 if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 || 3334 (r = sshbuf_get_u32(decrypted, &check2)) != 0) 3335 goto out; 3336 if (check1 != check2) { 3337 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 3338 goto out; 3339 } 3340 3341 /* Load the private key and comment */ 3342 if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 || 3343 (r = sshbuf_get_cstring(decrypted, &comment, NULL)) != 0) 3344 goto out; 3345 3346 /* Check deterministic padding */ 3347 i = 0; 3348 while (sshbuf_len(decrypted)) { 3349 if ((r = sshbuf_get_u8(decrypted, &pad)) != 0) 3350 goto out; 3351 if (pad != (++i & 0xff)) { 3352 r = SSH_ERR_INVALID_FORMAT; 3353 goto out; 3354 } 3355 } 3356 3357 /* XXX decode pubkey and check against private */ 3358 3359 /* success */ 3360 r = 0; 3361 if (keyp != NULL) { 3362 *keyp = k; 3363 k = NULL; 3364 } 3365 if (commentp != NULL) { 3366 *commentp = comment; 3367 comment = NULL; 3368 } 3369 out: 3370 pad = 0; 3371 cipher_cleanup(&ciphercontext); 3372 free(ciphername); 3373 free(kdfname); 3374 free(comment); 3375 if (salt != NULL) { 3376 explicit_bzero(salt, slen); 3377 free(salt); 3378 } 3379 if (key != NULL) { 3380 explicit_bzero(key, keylen + ivlen); 3381 free(key); 3382 } 3383 sshbuf_free(encoded); 3384 sshbuf_free(decoded); 3385 sshbuf_free(kdf); 3386 sshbuf_free(decrypted); 3387 sshkey_free(k); 3388 return r; 3389 } 3390 3391 #if WITH_SSH1 3392 /* 3393 * Serialises the authentication (private) key to a blob, encrypting it with 3394 * passphrase. The identification of the blob (lowest 64 bits of n) will 3395 * precede the key to provide identification of the key without needing a 3396 * passphrase. 3397 */ 3398 static int 3399 sshkey_private_rsa1_to_blob(struct sshkey *key, struct sshbuf *blob, 3400 const char *passphrase, const char *comment) 3401 { 3402 struct sshbuf *buffer = NULL, *encrypted = NULL; 3403 u_char buf[8]; 3404 int r, cipher_num; 3405 struct sshcipher_ctx ciphercontext; 3406 const struct sshcipher *cipher; 3407 u_char *cp; 3408 3409 /* 3410 * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting 3411 * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. 3412 */ 3413 cipher_num = (strcmp(passphrase, "") == 0) ? 3414 SSH_CIPHER_NONE : SSH_CIPHER_3DES; 3415 if ((cipher = cipher_by_number(cipher_num)) == NULL) 3416 return SSH_ERR_INTERNAL_ERROR; 3417 3418 /* This buffer is used to build the secret part of the private key. */ 3419 if ((buffer = sshbuf_new()) == NULL) 3420 return SSH_ERR_ALLOC_FAIL; 3421 3422 /* Put checkbytes for checking passphrase validity. */ 3423 if ((r = sshbuf_reserve(buffer, 4, &cp)) != 0) 3424 goto out; 3425 arc4random_buf(cp, 2); 3426 memcpy(cp + 2, cp, 2); 3427 3428 /* 3429 * Store the private key (n and e will not be stored because they 3430 * will be stored in plain text, and storing them also in encrypted 3431 * format would just give known plaintext). 3432 * Note: q and p are stored in reverse order to SSL. 3433 */ 3434 if ((r = sshbuf_put_bignum1(buffer, key->rsa->d)) != 0 || 3435 (r = sshbuf_put_bignum1(buffer, key->rsa->iqmp)) != 0 || 3436 (r = sshbuf_put_bignum1(buffer, key->rsa->q)) != 0 || 3437 (r = sshbuf_put_bignum1(buffer, key->rsa->p)) != 0) 3438 goto out; 3439 3440 /* Pad the part to be encrypted to a size that is a multiple of 8. */ 3441 explicit_bzero(buf, 8); 3442 if ((r = sshbuf_put(buffer, buf, 8 - (sshbuf_len(buffer) % 8))) != 0) 3443 goto out; 3444 3445 /* This buffer will be used to contain the data in the file. */ 3446 if ((encrypted = sshbuf_new()) == NULL) { 3447 r = SSH_ERR_ALLOC_FAIL; 3448 goto out; 3449 } 3450 3451 /* First store keyfile id string. */ 3452 if ((r = sshbuf_put(encrypted, LEGACY_BEGIN, 3453 sizeof(LEGACY_BEGIN))) != 0) 3454 goto out; 3455 3456 /* Store cipher type and "reserved" field. */ 3457 if ((r = sshbuf_put_u8(encrypted, cipher_num)) != 0 || 3458 (r = sshbuf_put_u32(encrypted, 0)) != 0) 3459 goto out; 3460 3461 /* Store public key. This will be in plain text. */ 3462 if ((r = sshbuf_put_u32(encrypted, BN_num_bits(key->rsa->n))) != 0 || 3463 (r = sshbuf_put_bignum1(encrypted, key->rsa->n)) != 0 || 3464 (r = sshbuf_put_bignum1(encrypted, key->rsa->e)) != 0 || 3465 (r = sshbuf_put_cstring(encrypted, comment)) != 0) 3466 goto out; 3467 3468 /* Allocate space for the private part of the key in the buffer. */ 3469 if ((r = sshbuf_reserve(encrypted, sshbuf_len(buffer), &cp)) != 0) 3470 goto out; 3471 3472 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase, 3473 CIPHER_ENCRYPT)) != 0) 3474 goto out; 3475 if ((r = cipher_crypt(&ciphercontext, 0, cp, 3476 sshbuf_ptr(buffer), sshbuf_len(buffer), 0, 0)) != 0) 3477 goto out; 3478 if ((r = cipher_cleanup(&ciphercontext)) != 0) 3479 goto out; 3480 3481 r = sshbuf_putb(blob, encrypted); 3482 3483 out: 3484 explicit_bzero(&ciphercontext, sizeof(ciphercontext)); 3485 explicit_bzero(buf, sizeof(buf)); 3486 sshbuf_free(buffer); 3487 sshbuf_free(encrypted); 3488 3489 return r; 3490 } 3491 #endif /* WITH_SSH1 */ 3492 3493 #ifdef WITH_OPENSSL 3494 /* convert SSH v2 key in OpenSSL PEM format */ 3495 static int 3496 sshkey_private_pem_to_blob(struct sshkey *key, struct sshbuf *blob, 3497 const char *_passphrase, const char *comment) 3498 { 3499 int success, r; 3500 int blen, len = strlen(_passphrase); 3501 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; 3502 #if (OPENSSL_VERSION_NUMBER < 0x00907000L) 3503 const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; 3504 #else 3505 const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL; 3506 #endif 3507 const u_char *bptr; 3508 BIO *bio = NULL; 3509 3510 if (len > 0 && len <= 4) 3511 return SSH_ERR_PASSPHRASE_TOO_SHORT; 3512 if ((bio = BIO_new(BIO_s_mem())) == NULL) 3513 return SSH_ERR_ALLOC_FAIL; 3514 3515 switch (key->type) { 3516 case KEY_DSA: 3517 success = PEM_write_bio_DSAPrivateKey(bio, key->dsa, 3518 cipher, passphrase, len, NULL, NULL); 3519 break; 3520 #ifdef OPENSSL_HAS_ECC 3521 case KEY_ECDSA: 3522 success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa, 3523 cipher, passphrase, len, NULL, NULL); 3524 break; 3525 #endif 3526 case KEY_RSA: 3527 success = PEM_write_bio_RSAPrivateKey(bio, key->rsa, 3528 cipher, passphrase, len, NULL, NULL); 3529 break; 3530 default: 3531 success = 0; 3532 break; 3533 } 3534 if (success == 0) { 3535 r = SSH_ERR_LIBCRYPTO_ERROR; 3536 goto out; 3537 } 3538 if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) { 3539 r = SSH_ERR_INTERNAL_ERROR; 3540 goto out; 3541 } 3542 if ((r = sshbuf_put(blob, bptr, blen)) != 0) 3543 goto out; 3544 r = 0; 3545 out: 3546 BIO_free(bio); 3547 return r; 3548 } 3549 #endif /* WITH_OPENSSL */ 3550 3551 /* Serialise "key" to buffer "blob" */ 3552 int 3553 sshkey_private_to_fileblob(struct sshkey *key, struct sshbuf *blob, 3554 const char *passphrase, const char *comment, 3555 int force_new_format, const char *new_format_cipher, int new_format_rounds) 3556 { 3557 switch (key->type) { 3558 #ifdef WITH_SSH1 3559 case KEY_RSA1: 3560 return sshkey_private_rsa1_to_blob(key, blob, 3561 passphrase, comment); 3562 #endif /* WITH_SSH1 */ 3563 #ifdef WITH_OPENSSL 3564 case KEY_DSA: 3565 case KEY_ECDSA: 3566 case KEY_RSA: 3567 if (force_new_format) { 3568 return sshkey_private_to_blob2(key, blob, passphrase, 3569 comment, new_format_cipher, new_format_rounds); 3570 } 3571 return sshkey_private_pem_to_blob(key, blob, 3572 passphrase, comment); 3573 #endif /* WITH_OPENSSL */ 3574 case KEY_ED25519: 3575 return sshkey_private_to_blob2(key, blob, passphrase, 3576 comment, new_format_cipher, new_format_rounds); 3577 default: 3578 return SSH_ERR_KEY_TYPE_UNKNOWN; 3579 } 3580 } 3581 3582 #ifdef WITH_SSH1 3583 /* 3584 * Parse the public, unencrypted portion of a RSA1 key. 3585 */ 3586 int 3587 sshkey_parse_public_rsa1_fileblob(struct sshbuf *blob, 3588 struct sshkey **keyp, char **commentp) 3589 { 3590 int r; 3591 struct sshkey *pub = NULL; 3592 struct sshbuf *copy = NULL; 3593 3594 if (keyp != NULL) 3595 *keyp = NULL; 3596 if (commentp != NULL) 3597 *commentp = NULL; 3598 3599 /* Check that it is at least big enough to contain the ID string. */ 3600 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN)) 3601 return SSH_ERR_INVALID_FORMAT; 3602 3603 /* 3604 * Make sure it begins with the id string. Consume the id string 3605 * from the buffer. 3606 */ 3607 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0) 3608 return SSH_ERR_INVALID_FORMAT; 3609 /* Make a working copy of the keyblob and skip past the magic */ 3610 if ((copy = sshbuf_fromb(blob)) == NULL) 3611 return SSH_ERR_ALLOC_FAIL; 3612 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0) 3613 goto out; 3614 3615 /* Skip cipher type, reserved data and key bits. */ 3616 if ((r = sshbuf_get_u8(copy, NULL)) != 0 || /* cipher type */ 3617 (r = sshbuf_get_u32(copy, NULL)) != 0 || /* reserved */ 3618 (r = sshbuf_get_u32(copy, NULL)) != 0) /* key bits */ 3619 goto out; 3620 3621 /* Read the public key from the buffer. */ 3622 if ((pub = sshkey_new(KEY_RSA1)) == NULL || 3623 (r = sshbuf_get_bignum1(copy, pub->rsa->n)) != 0 || 3624 (r = sshbuf_get_bignum1(copy, pub->rsa->e)) != 0) 3625 goto out; 3626 3627 /* Finally, the comment */ 3628 if ((r = sshbuf_get_string(copy, (u_char**)commentp, NULL)) != 0) 3629 goto out; 3630 3631 /* The encrypted private part is not parsed by this function. */ 3632 3633 r = 0; 3634 if (keyp != NULL) 3635 *keyp = pub; 3636 else 3637 sshkey_free(pub); 3638 pub = NULL; 3639 3640 out: 3641 sshbuf_free(copy); 3642 sshkey_free(pub); 3643 return r; 3644 } 3645 3646 static int 3647 sshkey_parse_private_rsa1(struct sshbuf *blob, const char *passphrase, 3648 struct sshkey **keyp, char **commentp) 3649 { 3650 int r; 3651 u_int16_t check1, check2; 3652 u_int8_t cipher_type; 3653 struct sshbuf *decrypted = NULL, *copy = NULL; 3654 u_char *cp; 3655 char *comment = NULL; 3656 struct sshcipher_ctx ciphercontext; 3657 const struct sshcipher *cipher; 3658 struct sshkey *prv = NULL; 3659 3660 *keyp = NULL; 3661 if (commentp != NULL) 3662 *commentp = NULL; 3663 3664 /* Check that it is at least big enough to contain the ID string. */ 3665 if (sshbuf_len(blob) < sizeof(LEGACY_BEGIN)) 3666 return SSH_ERR_INVALID_FORMAT; 3667 3668 /* 3669 * Make sure it begins with the id string. Consume the id string 3670 * from the buffer. 3671 */ 3672 if (memcmp(sshbuf_ptr(blob), LEGACY_BEGIN, sizeof(LEGACY_BEGIN)) != 0) 3673 return SSH_ERR_INVALID_FORMAT; 3674 3675 if ((prv = sshkey_new_private(KEY_RSA1)) == NULL) { 3676 r = SSH_ERR_ALLOC_FAIL; 3677 goto out; 3678 } 3679 if ((copy = sshbuf_fromb(blob)) == NULL || 3680 (decrypted = sshbuf_new()) == NULL) { 3681 r = SSH_ERR_ALLOC_FAIL; 3682 goto out; 3683 } 3684 if ((r = sshbuf_consume(copy, sizeof(LEGACY_BEGIN))) != 0) 3685 goto out; 3686 3687 /* Read cipher type. */ 3688 if ((r = sshbuf_get_u8(copy, &cipher_type)) != 0 || 3689 (r = sshbuf_get_u32(copy, NULL)) != 0) /* reserved */ 3690 goto out; 3691 3692 /* Read the public key and comment from the buffer. */ 3693 if ((r = sshbuf_get_u32(copy, NULL)) != 0 || /* key bits */ 3694 (r = sshbuf_get_bignum1(copy, prv->rsa->n)) != 0 || 3695 (r = sshbuf_get_bignum1(copy, prv->rsa->e)) != 0 || 3696 (r = sshbuf_get_cstring(copy, &comment, NULL)) != 0) 3697 goto out; 3698 3699 /* Check that it is a supported cipher. */ 3700 cipher = cipher_by_number(cipher_type); 3701 if (cipher == NULL) { 3702 r = SSH_ERR_KEY_UNKNOWN_CIPHER; 3703 goto out; 3704 } 3705 /* Initialize space for decrypted data. */ 3706 if ((r = sshbuf_reserve(decrypted, sshbuf_len(copy), &cp)) != 0) 3707 goto out; 3708 3709 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ 3710 if ((r = cipher_set_key_string(&ciphercontext, cipher, passphrase, 3711 CIPHER_DECRYPT)) != 0) 3712 goto out; 3713 if ((r = cipher_crypt(&ciphercontext, 0, cp, 3714 sshbuf_ptr(copy), sshbuf_len(copy), 0, 0)) != 0) { 3715 cipher_cleanup(&ciphercontext); 3716 goto out; 3717 } 3718 if ((r = cipher_cleanup(&ciphercontext)) != 0) 3719 goto out; 3720 3721 if ((r = sshbuf_get_u16(decrypted, &check1)) != 0 || 3722 (r = sshbuf_get_u16(decrypted, &check2)) != 0) 3723 goto out; 3724 if (check1 != check2) { 3725 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 3726 goto out; 3727 } 3728 3729 /* Read the rest of the private key. */ 3730 if ((r = sshbuf_get_bignum1(decrypted, prv->rsa->d)) != 0 || 3731 (r = sshbuf_get_bignum1(decrypted, prv->rsa->iqmp)) != 0 || 3732 (r = sshbuf_get_bignum1(decrypted, prv->rsa->q)) != 0 || 3733 (r = sshbuf_get_bignum1(decrypted, prv->rsa->p)) != 0) 3734 goto out; 3735 3736 /* calculate p-1 and q-1 */ 3737 if ((r = rsa_generate_additional_parameters(prv->rsa)) != 0) 3738 goto out; 3739 3740 /* enable blinding */ 3741 if (RSA_blinding_on(prv->rsa, NULL) != 1) { 3742 r = SSH_ERR_LIBCRYPTO_ERROR; 3743 goto out; 3744 } 3745 r = 0; 3746 *keyp = prv; 3747 prv = NULL; 3748 if (commentp != NULL) { 3749 *commentp = comment; 3750 comment = NULL; 3751 } 3752 out: 3753 explicit_bzero(&ciphercontext, sizeof(ciphercontext)); 3754 free(comment); 3755 sshkey_free(prv); 3756 sshbuf_free(copy); 3757 sshbuf_free(decrypted); 3758 return r; 3759 } 3760 #endif /* WITH_SSH1 */ 3761 3762 #ifdef WITH_OPENSSL 3763 static int 3764 sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type, 3765 const char *passphrase, struct sshkey **keyp) 3766 { 3767 EVP_PKEY *pk = NULL; 3768 struct sshkey *prv = NULL; 3769 BIO *bio = NULL; 3770 int r; 3771 3772 *keyp = NULL; 3773 3774 if ((bio = BIO_new(BIO_s_mem())) == NULL || sshbuf_len(blob) > INT_MAX) 3775 return SSH_ERR_ALLOC_FAIL; 3776 if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) != 3777 (int)sshbuf_len(blob)) { 3778 r = SSH_ERR_ALLOC_FAIL; 3779 goto out; 3780 } 3781 3782 if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL, 3783 (char *)passphrase)) == NULL) { 3784 r = SSH_ERR_KEY_WRONG_PASSPHRASE; 3785 goto out; 3786 } 3787 if (pk->type == EVP_PKEY_RSA && 3788 (type == KEY_UNSPEC || type == KEY_RSA)) { 3789 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { 3790 r = SSH_ERR_ALLOC_FAIL; 3791 goto out; 3792 } 3793 prv->rsa = EVP_PKEY_get1_RSA(pk); 3794 prv->type = KEY_RSA; 3795 #ifdef DEBUG_PK 3796 RSA_print_fp(stderr, prv->rsa, 8); 3797 #endif 3798 if (RSA_blinding_on(prv->rsa, NULL) != 1) { 3799 r = SSH_ERR_LIBCRYPTO_ERROR; 3800 goto out; 3801 } 3802 } else if (pk->type == EVP_PKEY_DSA && 3803 (type == KEY_UNSPEC || type == KEY_DSA)) { 3804 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { 3805 r = SSH_ERR_ALLOC_FAIL; 3806 goto out; 3807 } 3808 prv->dsa = EVP_PKEY_get1_DSA(pk); 3809 prv->type = KEY_DSA; 3810 #ifdef DEBUG_PK 3811 DSA_print_fp(stderr, prv->dsa, 8); 3812 #endif 3813 #ifdef OPENSSL_HAS_ECC 3814 } else if (pk->type == EVP_PKEY_EC && 3815 (type == KEY_UNSPEC || type == KEY_ECDSA)) { 3816 if ((prv = sshkey_new(KEY_UNSPEC)) == NULL) { 3817 r = SSH_ERR_ALLOC_FAIL; 3818 goto out; 3819 } 3820 prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk); 3821 prv->type = KEY_ECDSA; 3822 prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa); 3823 if (prv->ecdsa_nid == -1 || 3824 sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL || 3825 sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa), 3826 EC_KEY_get0_public_key(prv->ecdsa)) != 0 || 3827 sshkey_ec_validate_private(prv->ecdsa) != 0) { 3828 r = SSH_ERR_INVALID_FORMAT; 3829 goto out; 3830 } 3831 # ifdef DEBUG_PK 3832 if (prv != NULL && prv->ecdsa != NULL) 3833 sshkey_dump_ec_key(prv->ecdsa); 3834 # endif 3835 #endif /* OPENSSL_HAS_ECC */ 3836 } else { 3837 r = SSH_ERR_INVALID_FORMAT; 3838 goto out; 3839 } 3840 r = 0; 3841 *keyp = prv; 3842 prv = NULL; 3843 out: 3844 BIO_free(bio); 3845 if (pk != NULL) 3846 EVP_PKEY_free(pk); 3847 sshkey_free(prv); 3848 return r; 3849 } 3850 #endif /* WITH_OPENSSL */ 3851 3852 int 3853 sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type, 3854 const char *passphrase, struct sshkey **keyp, char **commentp) 3855 { 3856 *keyp = NULL; 3857 if (commentp != NULL) 3858 *commentp = NULL; 3859 3860 switch (type) { 3861 #ifdef WITH_SSH1 3862 case KEY_RSA1: 3863 return sshkey_parse_private_rsa1(blob, passphrase, 3864 keyp, commentp); 3865 #endif /* WITH_SSH1 */ 3866 #ifdef WITH_OPENSSL 3867 case KEY_DSA: 3868 case KEY_ECDSA: 3869 case KEY_RSA: 3870 return sshkey_parse_private_pem_fileblob(blob, type, 3871 passphrase, keyp); 3872 #endif /* WITH_OPENSSL */ 3873 case KEY_ED25519: 3874 return sshkey_parse_private2(blob, type, passphrase, 3875 keyp, commentp); 3876 case KEY_UNSPEC: 3877 if (sshkey_parse_private2(blob, type, passphrase, keyp, 3878 commentp) == 0) 3879 return 0; 3880 #ifdef WITH_OPENSSL 3881 return sshkey_parse_private_pem_fileblob(blob, type, 3882 passphrase, keyp); 3883 #else 3884 return SSH_ERR_INVALID_FORMAT; 3885 #endif /* WITH_OPENSSL */ 3886 default: 3887 return SSH_ERR_KEY_TYPE_UNKNOWN; 3888 } 3889 } 3890 3891 int 3892 sshkey_parse_private_fileblob(struct sshbuf *buffer, const char *passphrase, 3893 struct sshkey **keyp, char **commentp) 3894 { 3895 if (keyp != NULL) 3896 *keyp = NULL; 3897 if (commentp != NULL) 3898 *commentp = NULL; 3899 3900 #ifdef WITH_SSH1 3901 /* it's a SSH v1 key if the public key part is readable */ 3902 if (sshkey_parse_public_rsa1_fileblob(buffer, NULL, NULL) == 0) { 3903 return sshkey_parse_private_fileblob_type(buffer, KEY_RSA1, 3904 passphrase, keyp, commentp); 3905 } 3906 #endif /* WITH_SSH1 */ 3907 return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC, 3908 passphrase, keyp, commentp); 3909 } 3910