1 /* $OpenBSD: tls.c,v 1.92 2021/10/21 14:31:21 tb Exp $ */ 2 /* 3 * Copyright (c) 2014 Joel Sing <jsing@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/socket.h> 19 20 #include <errno.h> 21 #include <limits.h> 22 #include <pthread.h> 23 #include <stdlib.h> 24 #include <unistd.h> 25 26 #include <openssl/bio.h> 27 #include <openssl/err.h> 28 #include <openssl/evp.h> 29 #include <openssl/pem.h> 30 #include <openssl/safestack.h> 31 #include <openssl/ssl.h> 32 #include <openssl/x509.h> 33 34 #include <tls.h> 35 #include "tls_internal.h" 36 37 static struct tls_config *tls_config_default; 38 39 static int tls_init_rv = -1; 40 41 static void 42 tls_do_init(void) 43 { 44 OPENSSL_init_ssl(OPENSSL_INIT_NO_LOAD_CONFIG, NULL); 45 46 if (BIO_sock_init() != 1) 47 return; 48 49 if ((tls_config_default = tls_config_new_internal()) == NULL) 50 return; 51 52 tls_config_default->refcount++; 53 54 tls_init_rv = 0; 55 } 56 57 int 58 tls_init(void) 59 { 60 static pthread_once_t once = PTHREAD_ONCE_INIT; 61 62 if (pthread_once(&once, tls_do_init) != 0) 63 return -1; 64 65 return tls_init_rv; 66 } 67 68 const char * 69 tls_error(struct tls *ctx) 70 { 71 return ctx->error.msg; 72 } 73 74 void 75 tls_error_clear(struct tls_error *error) 76 { 77 free(error->msg); 78 error->msg = NULL; 79 error->num = 0; 80 error->tls = 0; 81 } 82 83 static int 84 tls_error_vset(struct tls_error *error, int errnum, const char *fmt, va_list ap) 85 { 86 char *errmsg = NULL; 87 int rv = -1; 88 89 tls_error_clear(error); 90 91 error->num = errnum; 92 error->tls = 1; 93 94 if (vasprintf(&errmsg, fmt, ap) == -1) { 95 errmsg = NULL; 96 goto err; 97 } 98 99 if (errnum == -1) { 100 error->msg = errmsg; 101 return (0); 102 } 103 104 if (asprintf(&error->msg, "%s: %s", errmsg, strerror(errnum)) == -1) { 105 error->msg = NULL; 106 goto err; 107 } 108 rv = 0; 109 110 err: 111 free(errmsg); 112 113 return (rv); 114 } 115 116 int 117 tls_error_set(struct tls_error *error, const char *fmt, ...) 118 { 119 va_list ap; 120 int errnum, rv; 121 122 errnum = errno; 123 124 va_start(ap, fmt); 125 rv = tls_error_vset(error, errnum, fmt, ap); 126 va_end(ap); 127 128 return (rv); 129 } 130 131 int 132 tls_error_setx(struct tls_error *error, const char *fmt, ...) 133 { 134 va_list ap; 135 int rv; 136 137 va_start(ap, fmt); 138 rv = tls_error_vset(error, -1, fmt, ap); 139 va_end(ap); 140 141 return (rv); 142 } 143 144 int 145 tls_config_set_error(struct tls_config *config, const char *fmt, ...) 146 { 147 va_list ap; 148 int errnum, rv; 149 150 errnum = errno; 151 152 va_start(ap, fmt); 153 rv = tls_error_vset(&config->error, errnum, fmt, ap); 154 va_end(ap); 155 156 return (rv); 157 } 158 159 int 160 tls_config_set_errorx(struct tls_config *config, const char *fmt, ...) 161 { 162 va_list ap; 163 int rv; 164 165 va_start(ap, fmt); 166 rv = tls_error_vset(&config->error, -1, fmt, ap); 167 va_end(ap); 168 169 return (rv); 170 } 171 172 int 173 tls_set_error(struct tls *ctx, const char *fmt, ...) 174 { 175 va_list ap; 176 int errnum, rv; 177 178 errnum = errno; 179 180 va_start(ap, fmt); 181 rv = tls_error_vset(&ctx->error, errnum, fmt, ap); 182 va_end(ap); 183 184 return (rv); 185 } 186 187 int 188 tls_set_errorx(struct tls *ctx, const char *fmt, ...) 189 { 190 va_list ap; 191 int rv; 192 193 va_start(ap, fmt); 194 rv = tls_error_vset(&ctx->error, -1, fmt, ap); 195 va_end(ap); 196 197 return (rv); 198 } 199 200 int 201 tls_set_ssl_errorx(struct tls *ctx, const char *fmt, ...) 202 { 203 va_list ap; 204 int rv; 205 206 /* Only set an error if a more specific one does not already exist. */ 207 if (ctx->error.tls != 0) 208 return (0); 209 210 va_start(ap, fmt); 211 rv = tls_error_vset(&ctx->error, -1, fmt, ap); 212 va_end(ap); 213 214 return (rv); 215 } 216 217 struct tls_sni_ctx * 218 tls_sni_ctx_new(void) 219 { 220 return (calloc(1, sizeof(struct tls_sni_ctx))); 221 } 222 223 void 224 tls_sni_ctx_free(struct tls_sni_ctx *sni_ctx) 225 { 226 if (sni_ctx == NULL) 227 return; 228 229 SSL_CTX_free(sni_ctx->ssl_ctx); 230 X509_free(sni_ctx->ssl_cert); 231 232 free(sni_ctx); 233 } 234 235 struct tls * 236 tls_new(void) 237 { 238 struct tls *ctx; 239 240 if ((ctx = calloc(1, sizeof(*ctx))) == NULL) 241 return (NULL); 242 243 tls_reset(ctx); 244 245 if (tls_configure(ctx, tls_config_default) == -1) { 246 free(ctx); 247 return NULL; 248 } 249 250 return (ctx); 251 } 252 253 int 254 tls_configure(struct tls *ctx, struct tls_config *config) 255 { 256 if (config == NULL) 257 config = tls_config_default; 258 259 pthread_mutex_lock(&config->mutex); 260 config->refcount++; 261 pthread_mutex_unlock(&config->mutex); 262 263 tls_config_free(ctx->config); 264 265 ctx->config = config; 266 ctx->keypair = config->keypair; 267 268 if ((ctx->flags & TLS_SERVER) != 0) 269 return (tls_configure_server(ctx)); 270 271 return (0); 272 } 273 274 int 275 tls_cert_hash(X509 *cert, char **hash) 276 { 277 char d[EVP_MAX_MD_SIZE], *dhex = NULL; 278 int dlen, rv = -1; 279 280 free(*hash); 281 *hash = NULL; 282 283 if (X509_digest(cert, EVP_sha256(), d, &dlen) != 1) 284 goto err; 285 286 if (tls_hex_string(d, dlen, &dhex, NULL) != 0) 287 goto err; 288 289 if (asprintf(hash, "SHA256:%s", dhex) == -1) { 290 *hash = NULL; 291 goto err; 292 } 293 294 rv = 0; 295 err: 296 free(dhex); 297 298 return (rv); 299 } 300 301 int 302 tls_cert_pubkey_hash(X509 *cert, char **hash) 303 { 304 char d[EVP_MAX_MD_SIZE], *dhex = NULL; 305 int dlen, rv = -1; 306 307 free(*hash); 308 *hash = NULL; 309 310 if (X509_pubkey_digest(cert, EVP_sha256(), d, &dlen) != 1) 311 goto err; 312 313 if (tls_hex_string(d, dlen, &dhex, NULL) != 0) 314 goto err; 315 316 if (asprintf(hash, "SHA256:%s", dhex) == -1) { 317 *hash = NULL; 318 goto err; 319 } 320 321 rv = 0; 322 323 err: 324 free(dhex); 325 326 return (rv); 327 } 328 329 static int 330 tls_keypair_to_pkey(struct tls *ctx, struct tls_keypair *keypair, EVP_PKEY **pkey) 331 { 332 BIO *bio = NULL; 333 X509 *x509 = NULL; 334 char *mem; 335 size_t len; 336 int ret = -1; 337 338 *pkey = NULL; 339 340 if (ctx->config->use_fake_private_key) { 341 mem = keypair->cert_mem; 342 len = keypair->cert_len; 343 } else { 344 mem = keypair->key_mem; 345 len = keypair->key_len; 346 } 347 348 if (mem == NULL) 349 return (0); 350 351 if (len > INT_MAX) { 352 tls_set_errorx(ctx, ctx->config->use_fake_private_key ? 353 "cert too long" : "key too long"); 354 goto err; 355 } 356 357 if ((bio = BIO_new_mem_buf(mem, len)) == NULL) { 358 tls_set_errorx(ctx, "failed to create buffer"); 359 goto err; 360 } 361 362 if (ctx->config->use_fake_private_key) { 363 if ((x509 = PEM_read_bio_X509(bio, NULL, tls_password_cb, 364 NULL)) == NULL) { 365 tls_set_errorx(ctx, "failed to read X509 certificate"); 366 goto err; 367 } 368 if ((*pkey = X509_get_pubkey(x509)) == NULL) { 369 tls_set_errorx(ctx, "failed to retrieve pubkey"); 370 goto err; 371 } 372 } else { 373 if ((*pkey = PEM_read_bio_PrivateKey(bio, NULL, tls_password_cb, 374 NULL)) == NULL) { 375 tls_set_errorx(ctx, "failed to read private key"); 376 goto err; 377 } 378 } 379 380 ret = 0; 381 err: 382 BIO_free(bio); 383 X509_free(x509); 384 return (ret); 385 } 386 387 static int 388 tls_keypair_setup_pkey(struct tls *ctx, struct tls_keypair *keypair, EVP_PKEY *pkey) 389 { 390 RSA *rsa = NULL; 391 EC_KEY *eckey = NULL; 392 int ret = -1; 393 394 /* Only install the pubkey hash if fake private keys are used. */ 395 if (!ctx->config->skip_private_key_check) 396 return (0); 397 398 if (keypair->pubkey_hash == NULL) { 399 tls_set_errorx(ctx, "public key hash not set"); 400 goto err; 401 } 402 403 switch (EVP_PKEY_id(pkey)) { 404 case EVP_PKEY_RSA: 405 if ((rsa = EVP_PKEY_get1_RSA(pkey)) == NULL || 406 RSA_set_ex_data(rsa, 0, keypair->pubkey_hash) == 0) { 407 tls_set_errorx(ctx, "RSA key setup failure"); 408 goto err; 409 } 410 break; 411 case EVP_PKEY_EC: 412 if ((eckey = EVP_PKEY_get1_EC_KEY(pkey)) == NULL || 413 ECDSA_set_ex_data(eckey, 0, keypair->pubkey_hash) == 0) { 414 tls_set_errorx(ctx, "EC key setup failure"); 415 goto err; 416 } 417 break; 418 default: 419 tls_set_errorx(ctx, "incorrect key type"); 420 goto err; 421 } 422 423 ret = 0; 424 425 err: 426 RSA_free(rsa); 427 EC_KEY_free(eckey); 428 return (ret); 429 } 430 431 int 432 tls_configure_ssl_keypair(struct tls *ctx, SSL_CTX *ssl_ctx, 433 struct tls_keypair *keypair, int required) 434 { 435 EVP_PKEY *pkey = NULL; 436 437 if (!required && 438 keypair->cert_mem == NULL && 439 keypair->key_mem == NULL) 440 return(0); 441 442 if (keypair->cert_mem != NULL) { 443 if (keypair->cert_len > INT_MAX) { 444 tls_set_errorx(ctx, "certificate too long"); 445 goto err; 446 } 447 448 if (SSL_CTX_use_certificate_chain_mem(ssl_ctx, 449 keypair->cert_mem, keypair->cert_len) != 1) { 450 tls_set_errorx(ctx, "failed to load certificate"); 451 goto err; 452 } 453 } 454 455 if (tls_keypair_to_pkey(ctx, keypair, &pkey) == -1) 456 goto err; 457 if (pkey != NULL) { 458 if (tls_keypair_setup_pkey(ctx, keypair, pkey) == -1) 459 goto err; 460 if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1) { 461 tls_set_errorx(ctx, "failed to load private key"); 462 goto err; 463 } 464 EVP_PKEY_free(pkey); 465 pkey = NULL; 466 } 467 468 if (!ctx->config->skip_private_key_check && 469 SSL_CTX_check_private_key(ssl_ctx) != 1) { 470 tls_set_errorx(ctx, "private/public key mismatch"); 471 goto err; 472 } 473 474 return (0); 475 476 err: 477 EVP_PKEY_free(pkey); 478 479 return (-1); 480 } 481 482 int 483 tls_configure_ssl(struct tls *ctx, SSL_CTX *ssl_ctx) 484 { 485 SSL_CTX_clear_mode(ssl_ctx, SSL_MODE_AUTO_RETRY); 486 487 SSL_CTX_set_mode(ssl_ctx, SSL_MODE_ENABLE_PARTIAL_WRITE); 488 SSL_CTX_set_mode(ssl_ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER); 489 490 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_SSLv2); 491 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_SSLv3); 492 493 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TLSv1); 494 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TLSv1_1); 495 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TLSv1_2); 496 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TLSv1_3); 497 498 if ((ctx->config->protocols & TLS_PROTOCOL_TLSv1_0) == 0) 499 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1); 500 if ((ctx->config->protocols & TLS_PROTOCOL_TLSv1_1) == 0) 501 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1_1); 502 if ((ctx->config->protocols & TLS_PROTOCOL_TLSv1_2) == 0) 503 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1_2); 504 if ((ctx->config->protocols & TLS_PROTOCOL_TLSv1_3) == 0) 505 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1_3); 506 507 if (ctx->config->alpn != NULL) { 508 if (SSL_CTX_set_alpn_protos(ssl_ctx, ctx->config->alpn, 509 ctx->config->alpn_len) != 0) { 510 tls_set_errorx(ctx, "failed to set alpn"); 511 goto err; 512 } 513 } 514 515 if (ctx->config->ciphers != NULL) { 516 if (SSL_CTX_set_cipher_list(ssl_ctx, 517 ctx->config->ciphers) != 1) { 518 tls_set_errorx(ctx, "failed to set ciphers"); 519 goto err; 520 } 521 } 522 523 if (ctx->config->verify_time == 0) { 524 X509_VERIFY_PARAM_set_flags(SSL_CTX_get0_param(ssl_ctx), 525 X509_V_FLAG_NO_CHECK_TIME); 526 } 527 528 /* Disable any form of session caching by default */ 529 SSL_CTX_set_session_cache_mode(ssl_ctx, SSL_SESS_CACHE_OFF); 530 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET); 531 532 return (0); 533 534 err: 535 return (-1); 536 } 537 538 static int 539 tls_ssl_cert_verify_cb(X509_STORE_CTX *x509_ctx, void *arg) 540 { 541 struct tls *ctx = arg; 542 int x509_err; 543 544 if (ctx->config->verify_cert == 0) 545 return (1); 546 547 if ((X509_verify_cert(x509_ctx)) < 0) { 548 tls_set_errorx(ctx, "X509 verify cert failed"); 549 return (0); 550 } 551 552 x509_err = X509_STORE_CTX_get_error(x509_ctx); 553 if (x509_err == X509_V_OK) 554 return (1); 555 556 tls_set_errorx(ctx, "certificate verification failed: %s", 557 X509_verify_cert_error_string(x509_err)); 558 559 return (0); 560 } 561 562 int 563 tls_configure_ssl_verify(struct tls *ctx, SSL_CTX *ssl_ctx, int verify) 564 { 565 size_t ca_len = ctx->config->ca_len; 566 char *ca_mem = ctx->config->ca_mem; 567 char *crl_mem = ctx->config->crl_mem; 568 size_t crl_len = ctx->config->crl_len; 569 char *ca_free = NULL; 570 STACK_OF(X509_INFO) *xis = NULL; 571 X509_STORE *store; 572 X509_INFO *xi; 573 BIO *bio = NULL; 574 int rv = -1; 575 int i; 576 577 SSL_CTX_set_verify(ssl_ctx, verify, NULL); 578 SSL_CTX_set_cert_verify_callback(ssl_ctx, tls_ssl_cert_verify_cb, ctx); 579 580 if (ctx->config->verify_depth >= 0) 581 SSL_CTX_set_verify_depth(ssl_ctx, ctx->config->verify_depth); 582 583 if (ctx->config->verify_cert == 0) 584 goto done; 585 586 /* If no CA has been specified, attempt to load the default. */ 587 if (ctx->config->ca_mem == NULL && ctx->config->ca_path == NULL) { 588 if (tls_config_load_file(&ctx->error, "CA", tls_default_ca_cert_file(), 589 &ca_mem, &ca_len) != 0) 590 goto err; 591 ca_free = ca_mem; 592 } 593 594 if (ca_mem != NULL) { 595 if (ca_len > INT_MAX) { 596 tls_set_errorx(ctx, "ca too long"); 597 goto err; 598 } 599 if (SSL_CTX_load_verify_mem(ssl_ctx, ca_mem, ca_len) != 1) { 600 tls_set_errorx(ctx, "ssl verify memory setup failure"); 601 goto err; 602 } 603 } else if (SSL_CTX_load_verify_locations(ssl_ctx, NULL, 604 ctx->config->ca_path) != 1) { 605 tls_set_errorx(ctx, "ssl verify locations failure"); 606 goto err; 607 } 608 609 if (crl_mem != NULL) { 610 if (crl_len > INT_MAX) { 611 tls_set_errorx(ctx, "crl too long"); 612 goto err; 613 } 614 if ((bio = BIO_new_mem_buf(crl_mem, crl_len)) == NULL) { 615 tls_set_errorx(ctx, "failed to create buffer"); 616 goto err; 617 } 618 if ((xis = PEM_X509_INFO_read_bio(bio, NULL, tls_password_cb, 619 NULL)) == NULL) { 620 tls_set_errorx(ctx, "failed to parse crl"); 621 goto err; 622 } 623 store = SSL_CTX_get_cert_store(ssl_ctx); 624 for (i = 0; i < sk_X509_INFO_num(xis); i++) { 625 xi = sk_X509_INFO_value(xis, i); 626 if (xi->crl == NULL) 627 continue; 628 if (!X509_STORE_add_crl(store, xi->crl)) { 629 tls_set_error(ctx, "failed to add crl"); 630 goto err; 631 } 632 xi->crl = NULL; 633 } 634 X509_STORE_set_flags(store, 635 X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL); 636 } 637 638 done: 639 rv = 0; 640 641 err: 642 sk_X509_INFO_pop_free(xis, X509_INFO_free); 643 BIO_free(bio); 644 free(ca_free); 645 646 return (rv); 647 } 648 649 void 650 tls_free(struct tls *ctx) 651 { 652 if (ctx == NULL) 653 return; 654 655 tls_reset(ctx); 656 657 free(ctx); 658 } 659 660 void 661 tls_reset(struct tls *ctx) 662 { 663 struct tls_sni_ctx *sni, *nsni; 664 665 tls_config_free(ctx->config); 666 ctx->config = NULL; 667 668 SSL_CTX_free(ctx->ssl_ctx); 669 SSL_free(ctx->ssl_conn); 670 X509_free(ctx->ssl_peer_cert); 671 672 ctx->ssl_conn = NULL; 673 ctx->ssl_ctx = NULL; 674 ctx->ssl_peer_cert = NULL; 675 /* X509 objects in chain are freed with the SSL */ 676 ctx->ssl_peer_chain = NULL; 677 678 ctx->socket = -1; 679 ctx->state = 0; 680 681 free(ctx->servername); 682 ctx->servername = NULL; 683 684 free(ctx->error.msg); 685 ctx->error.msg = NULL; 686 ctx->error.num = -1; 687 688 tls_conninfo_free(ctx->conninfo); 689 ctx->conninfo = NULL; 690 691 tls_ocsp_free(ctx->ocsp); 692 ctx->ocsp = NULL; 693 694 for (sni = ctx->sni_ctx; sni != NULL; sni = nsni) { 695 nsni = sni->next; 696 tls_sni_ctx_free(sni); 697 } 698 ctx->sni_ctx = NULL; 699 700 ctx->read_cb = NULL; 701 ctx->write_cb = NULL; 702 ctx->cb_arg = NULL; 703 } 704 705 int 706 tls_ssl_error(struct tls *ctx, SSL *ssl_conn, int ssl_ret, const char *prefix) 707 { 708 const char *errstr = "unknown error"; 709 unsigned long err; 710 int ssl_err; 711 712 ssl_err = SSL_get_error(ssl_conn, ssl_ret); 713 switch (ssl_err) { 714 case SSL_ERROR_NONE: 715 case SSL_ERROR_ZERO_RETURN: 716 return (0); 717 718 case SSL_ERROR_WANT_READ: 719 return (TLS_WANT_POLLIN); 720 721 case SSL_ERROR_WANT_WRITE: 722 return (TLS_WANT_POLLOUT); 723 724 case SSL_ERROR_SYSCALL: 725 if ((err = ERR_peek_error()) != 0) { 726 errstr = ERR_error_string(err, NULL); 727 } else if (ssl_ret == 0) { 728 if ((ctx->state & TLS_HANDSHAKE_COMPLETE) != 0) { 729 ctx->state |= TLS_EOF_NO_CLOSE_NOTIFY; 730 return (0); 731 } 732 errstr = "unexpected EOF"; 733 } else if (ssl_ret == -1) { 734 errstr = strerror(errno); 735 } 736 tls_set_ssl_errorx(ctx, "%s failed: %s", prefix, errstr); 737 return (-1); 738 739 case SSL_ERROR_SSL: 740 if ((err = ERR_peek_error()) != 0) { 741 errstr = ERR_error_string(err, NULL); 742 } 743 tls_set_ssl_errorx(ctx, "%s failed: %s", prefix, errstr); 744 return (-1); 745 746 case SSL_ERROR_WANT_CONNECT: 747 case SSL_ERROR_WANT_ACCEPT: 748 case SSL_ERROR_WANT_X509_LOOKUP: 749 default: 750 tls_set_ssl_errorx(ctx, "%s failed (%d)", prefix, ssl_err); 751 return (-1); 752 } 753 } 754 755 int 756 tls_handshake(struct tls *ctx) 757 { 758 int rv = -1; 759 760 tls_error_clear(&ctx->error); 761 762 if ((ctx->flags & (TLS_CLIENT | TLS_SERVER_CONN)) == 0) { 763 tls_set_errorx(ctx, "invalid operation for context"); 764 goto out; 765 } 766 767 if ((ctx->state & TLS_HANDSHAKE_COMPLETE) != 0) { 768 tls_set_errorx(ctx, "handshake already completed"); 769 goto out; 770 } 771 772 if ((ctx->flags & TLS_CLIENT) != 0) 773 rv = tls_handshake_client(ctx); 774 else if ((ctx->flags & TLS_SERVER_CONN) != 0) 775 rv = tls_handshake_server(ctx); 776 777 if (rv == 0) { 778 ctx->ssl_peer_cert = SSL_get_peer_certificate(ctx->ssl_conn); 779 ctx->ssl_peer_chain = SSL_get_peer_cert_chain(ctx->ssl_conn); 780 if (tls_conninfo_populate(ctx) == -1) 781 rv = -1; 782 if (ctx->ocsp == NULL) 783 ctx->ocsp = tls_ocsp_setup_from_peer(ctx); 784 } 785 out: 786 /* Prevent callers from performing incorrect error handling */ 787 errno = 0; 788 return (rv); 789 } 790 791 ssize_t 792 tls_read(struct tls *ctx, void *buf, size_t buflen) 793 { 794 ssize_t rv = -1; 795 int ssl_ret; 796 797 tls_error_clear(&ctx->error); 798 799 if ((ctx->state & TLS_HANDSHAKE_COMPLETE) == 0) { 800 if ((rv = tls_handshake(ctx)) != 0) 801 goto out; 802 } 803 804 if (buflen > INT_MAX) { 805 tls_set_errorx(ctx, "buflen too long"); 806 goto out; 807 } 808 809 ERR_clear_error(); 810 if ((ssl_ret = SSL_read(ctx->ssl_conn, buf, buflen)) > 0) { 811 rv = (ssize_t)ssl_ret; 812 goto out; 813 } 814 rv = (ssize_t)tls_ssl_error(ctx, ctx->ssl_conn, ssl_ret, "read"); 815 816 out: 817 /* Prevent callers from performing incorrect error handling */ 818 errno = 0; 819 return (rv); 820 } 821 822 ssize_t 823 tls_write(struct tls *ctx, const void *buf, size_t buflen) 824 { 825 ssize_t rv = -1; 826 int ssl_ret; 827 828 tls_error_clear(&ctx->error); 829 830 if ((ctx->state & TLS_HANDSHAKE_COMPLETE) == 0) { 831 if ((rv = tls_handshake(ctx)) != 0) 832 goto out; 833 } 834 835 if (buflen > INT_MAX) { 836 tls_set_errorx(ctx, "buflen too long"); 837 goto out; 838 } 839 840 ERR_clear_error(); 841 if ((ssl_ret = SSL_write(ctx->ssl_conn, buf, buflen)) > 0) { 842 rv = (ssize_t)ssl_ret; 843 goto out; 844 } 845 rv = (ssize_t)tls_ssl_error(ctx, ctx->ssl_conn, ssl_ret, "write"); 846 847 out: 848 /* Prevent callers from performing incorrect error handling */ 849 errno = 0; 850 return (rv); 851 } 852 853 int 854 tls_close(struct tls *ctx) 855 { 856 int ssl_ret; 857 int rv = 0; 858 859 tls_error_clear(&ctx->error); 860 861 if ((ctx->flags & (TLS_CLIENT | TLS_SERVER_CONN)) == 0) { 862 tls_set_errorx(ctx, "invalid operation for context"); 863 rv = -1; 864 goto out; 865 } 866 867 if (ctx->state & TLS_SSL_NEEDS_SHUTDOWN) { 868 ERR_clear_error(); 869 ssl_ret = SSL_shutdown(ctx->ssl_conn); 870 if (ssl_ret < 0) { 871 rv = tls_ssl_error(ctx, ctx->ssl_conn, ssl_ret, 872 "shutdown"); 873 if (rv == TLS_WANT_POLLIN || rv == TLS_WANT_POLLOUT) 874 goto out; 875 } 876 ctx->state &= ~TLS_SSL_NEEDS_SHUTDOWN; 877 } 878 879 if (ctx->socket != -1) { 880 if (shutdown(ctx->socket, SHUT_RDWR) != 0) { 881 if (rv == 0 && 882 errno != ENOTCONN && errno != ECONNRESET) { 883 tls_set_error(ctx, "shutdown"); 884 rv = -1; 885 } 886 } 887 if (close(ctx->socket) != 0) { 888 if (rv == 0) { 889 tls_set_error(ctx, "close"); 890 rv = -1; 891 } 892 } 893 ctx->socket = -1; 894 } 895 896 if ((ctx->state & TLS_EOF_NO_CLOSE_NOTIFY) != 0) { 897 tls_set_errorx(ctx, "EOF without close notify"); 898 rv = -1; 899 } 900 901 out: 902 /* Prevent callers from performing incorrect error handling */ 903 errno = 0; 904 return (rv); 905 } 906