1 /* $OpenBSD: tls.c,v 1.84 2020/01/20 08:39:21 jsing 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 int 330 tls_configure_ssl_keypair(struct tls *ctx, SSL_CTX *ssl_ctx, 331 struct tls_keypair *keypair, int required) 332 { 333 EVP_PKEY *pkey = NULL; 334 BIO *bio = NULL; 335 336 if (!required && 337 keypair->cert_mem == NULL && 338 keypair->key_mem == NULL) 339 return(0); 340 341 if (keypair->cert_mem != NULL) { 342 if (keypair->cert_len > INT_MAX) { 343 tls_set_errorx(ctx, "certificate too long"); 344 goto err; 345 } 346 347 if (SSL_CTX_use_certificate_chain_mem(ssl_ctx, 348 keypair->cert_mem, keypair->cert_len) != 1) { 349 tls_set_errorx(ctx, "failed to load certificate"); 350 goto err; 351 } 352 } 353 354 if (keypair->key_mem != NULL) { 355 if (keypair->key_len > INT_MAX) { 356 tls_set_errorx(ctx, "key too long"); 357 goto err; 358 } 359 360 if ((bio = BIO_new_mem_buf(keypair->key_mem, 361 keypair->key_len)) == NULL) { 362 tls_set_errorx(ctx, "failed to create buffer"); 363 goto err; 364 } 365 if ((pkey = PEM_read_bio_PrivateKey(bio, NULL, tls_password_cb, 366 NULL)) == NULL) { 367 tls_set_errorx(ctx, "failed to read private key"); 368 goto err; 369 } 370 371 if (keypair->pubkey_hash != NULL) { 372 RSA *rsa; 373 /* XXX only RSA for now for relayd privsep */ 374 if ((rsa = EVP_PKEY_get1_RSA(pkey)) != NULL) { 375 RSA_set_ex_data(rsa, 0, keypair->pubkey_hash); 376 RSA_free(rsa); 377 } 378 } 379 380 if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1) { 381 tls_set_errorx(ctx, "failed to load private key"); 382 goto err; 383 } 384 BIO_free(bio); 385 bio = NULL; 386 EVP_PKEY_free(pkey); 387 pkey = NULL; 388 } 389 390 if (!ctx->config->skip_private_key_check && 391 SSL_CTX_check_private_key(ssl_ctx) != 1) { 392 tls_set_errorx(ctx, "private/public key mismatch"); 393 goto err; 394 } 395 396 return (0); 397 398 err: 399 EVP_PKEY_free(pkey); 400 BIO_free(bio); 401 402 return (1); 403 } 404 405 int 406 tls_configure_ssl(struct tls *ctx, SSL_CTX *ssl_ctx) 407 { 408 SSL_CTX_set_mode(ssl_ctx, SSL_MODE_ENABLE_PARTIAL_WRITE); 409 SSL_CTX_set_mode(ssl_ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER); 410 411 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_SSLv2); 412 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_SSLv3); 413 414 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TLSv1); 415 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TLSv1_1); 416 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TLSv1_2); 417 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TLSv1_3); 418 419 if ((ctx->config->protocols & TLS_PROTOCOL_TLSv1_0) == 0) 420 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1); 421 if ((ctx->config->protocols & TLS_PROTOCOL_TLSv1_1) == 0) 422 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1_1); 423 if ((ctx->config->protocols & TLS_PROTOCOL_TLSv1_2) == 0) 424 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1_2); 425 if ((ctx->config->protocols & TLS_PROTOCOL_TLSv1_3) == 0) 426 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1_3); 427 428 if (ctx->config->alpn != NULL) { 429 if (SSL_CTX_set_alpn_protos(ssl_ctx, ctx->config->alpn, 430 ctx->config->alpn_len) != 0) { 431 tls_set_errorx(ctx, "failed to set alpn"); 432 goto err; 433 } 434 } 435 436 if (ctx->config->ciphers != NULL) { 437 if (SSL_CTX_set_cipher_list(ssl_ctx, 438 ctx->config->ciphers) != 1) { 439 tls_set_errorx(ctx, "failed to set ciphers"); 440 goto err; 441 } 442 } 443 444 if (ctx->config->verify_time == 0) { 445 X509_VERIFY_PARAM_set_flags(ssl_ctx->param, 446 X509_V_FLAG_NO_CHECK_TIME); 447 } 448 449 /* Disable any form of session caching by default */ 450 SSL_CTX_set_session_cache_mode(ssl_ctx, SSL_SESS_CACHE_OFF); 451 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET); 452 453 return (0); 454 455 err: 456 return (-1); 457 } 458 459 static int 460 tls_ssl_cert_verify_cb(X509_STORE_CTX *x509_ctx, void *arg) 461 { 462 struct tls *ctx = arg; 463 int x509_err; 464 465 if (ctx->config->verify_cert == 0) 466 return (1); 467 468 if ((X509_verify_cert(x509_ctx)) < 0) { 469 tls_set_errorx(ctx, "X509 verify cert failed"); 470 return (0); 471 } 472 473 x509_err = X509_STORE_CTX_get_error(x509_ctx); 474 if (x509_err == X509_V_OK) 475 return (1); 476 477 tls_set_errorx(ctx, "certificate verification failed: %s", 478 X509_verify_cert_error_string(x509_err)); 479 480 return (0); 481 } 482 483 int 484 tls_configure_ssl_verify(struct tls *ctx, SSL_CTX *ssl_ctx, int verify) 485 { 486 size_t ca_len = ctx->config->ca_len; 487 char *ca_mem = ctx->config->ca_mem; 488 char *crl_mem = ctx->config->crl_mem; 489 size_t crl_len = ctx->config->crl_len; 490 char *ca_free = NULL; 491 STACK_OF(X509_INFO) *xis = NULL; 492 X509_STORE *store; 493 X509_INFO *xi; 494 BIO *bio = NULL; 495 int rv = -1; 496 int i; 497 498 SSL_CTX_set_verify(ssl_ctx, verify, NULL); 499 SSL_CTX_set_cert_verify_callback(ssl_ctx, tls_ssl_cert_verify_cb, ctx); 500 501 if (ctx->config->verify_depth >= 0) 502 SSL_CTX_set_verify_depth(ssl_ctx, ctx->config->verify_depth); 503 504 if (ctx->config->verify_cert == 0) 505 goto done; 506 507 /* If no CA has been specified, attempt to load the default. */ 508 if (ctx->config->ca_mem == NULL && ctx->config->ca_path == NULL) { 509 if (tls_config_load_file(&ctx->error, "CA", tls_default_ca_cert_file(), 510 &ca_mem, &ca_len) != 0) 511 goto err; 512 ca_free = ca_mem; 513 } 514 515 if (ca_mem != NULL) { 516 if (ca_len > INT_MAX) { 517 tls_set_errorx(ctx, "ca too long"); 518 goto err; 519 } 520 if (SSL_CTX_load_verify_mem(ssl_ctx, ca_mem, ca_len) != 1) { 521 tls_set_errorx(ctx, "ssl verify memory setup failure"); 522 goto err; 523 } 524 } else if (SSL_CTX_load_verify_locations(ssl_ctx, NULL, 525 ctx->config->ca_path) != 1) { 526 tls_set_errorx(ctx, "ssl verify locations failure"); 527 goto err; 528 } 529 530 if (crl_mem != NULL) { 531 if (crl_len > INT_MAX) { 532 tls_set_errorx(ctx, "crl too long"); 533 goto err; 534 } 535 if ((bio = BIO_new_mem_buf(crl_mem, crl_len)) == NULL) { 536 tls_set_errorx(ctx, "failed to create buffer"); 537 goto err; 538 } 539 if ((xis = PEM_X509_INFO_read_bio(bio, NULL, tls_password_cb, 540 NULL)) == NULL) { 541 tls_set_errorx(ctx, "failed to parse crl"); 542 goto err; 543 } 544 store = SSL_CTX_get_cert_store(ssl_ctx); 545 for (i = 0; i < sk_X509_INFO_num(xis); i++) { 546 xi = sk_X509_INFO_value(xis, i); 547 if (xi->crl == NULL) 548 continue; 549 if (!X509_STORE_add_crl(store, xi->crl)) { 550 tls_set_error(ctx, "failed to add crl"); 551 goto err; 552 } 553 xi->crl = NULL; 554 } 555 X509_VERIFY_PARAM_set_flags(store->param, 556 X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL); 557 } 558 559 done: 560 rv = 0; 561 562 err: 563 sk_X509_INFO_pop_free(xis, X509_INFO_free); 564 BIO_free(bio); 565 free(ca_free); 566 567 return (rv); 568 } 569 570 void 571 tls_free(struct tls *ctx) 572 { 573 if (ctx == NULL) 574 return; 575 576 tls_reset(ctx); 577 578 free(ctx); 579 } 580 581 void 582 tls_reset(struct tls *ctx) 583 { 584 struct tls_sni_ctx *sni, *nsni; 585 586 tls_config_free(ctx->config); 587 ctx->config = NULL; 588 589 SSL_CTX_free(ctx->ssl_ctx); 590 SSL_free(ctx->ssl_conn); 591 X509_free(ctx->ssl_peer_cert); 592 593 ctx->ssl_conn = NULL; 594 ctx->ssl_ctx = NULL; 595 ctx->ssl_peer_cert = NULL; 596 /* X509 objects in chain are freed with the SSL */ 597 ctx->ssl_peer_chain = NULL; 598 599 ctx->socket = -1; 600 ctx->state = 0; 601 602 free(ctx->servername); 603 ctx->servername = NULL; 604 605 free(ctx->error.msg); 606 ctx->error.msg = NULL; 607 ctx->error.num = -1; 608 609 tls_conninfo_free(ctx->conninfo); 610 ctx->conninfo = NULL; 611 612 tls_ocsp_free(ctx->ocsp); 613 ctx->ocsp = NULL; 614 615 for (sni = ctx->sni_ctx; sni != NULL; sni = nsni) { 616 nsni = sni->next; 617 tls_sni_ctx_free(sni); 618 } 619 ctx->sni_ctx = NULL; 620 621 ctx->read_cb = NULL; 622 ctx->write_cb = NULL; 623 ctx->cb_arg = NULL; 624 } 625 626 int 627 tls_ssl_error(struct tls *ctx, SSL *ssl_conn, int ssl_ret, const char *prefix) 628 { 629 const char *errstr = "unknown error"; 630 unsigned long err; 631 int ssl_err; 632 633 ssl_err = SSL_get_error(ssl_conn, ssl_ret); 634 switch (ssl_err) { 635 case SSL_ERROR_NONE: 636 case SSL_ERROR_ZERO_RETURN: 637 return (0); 638 639 case SSL_ERROR_WANT_READ: 640 return (TLS_WANT_POLLIN); 641 642 case SSL_ERROR_WANT_WRITE: 643 return (TLS_WANT_POLLOUT); 644 645 case SSL_ERROR_SYSCALL: 646 if ((err = ERR_peek_error()) != 0) { 647 errstr = ERR_error_string(err, NULL); 648 } else if (ssl_ret == 0) { 649 if ((ctx->state & TLS_HANDSHAKE_COMPLETE) != 0) { 650 ctx->state |= TLS_EOF_NO_CLOSE_NOTIFY; 651 return (0); 652 } 653 errstr = "unexpected EOF"; 654 } else if (ssl_ret == -1) { 655 errstr = strerror(errno); 656 } 657 tls_set_ssl_errorx(ctx, "%s failed: %s", prefix, errstr); 658 return (-1); 659 660 case SSL_ERROR_SSL: 661 if ((err = ERR_peek_error()) != 0) { 662 errstr = ERR_error_string(err, NULL); 663 } 664 tls_set_ssl_errorx(ctx, "%s failed: %s", prefix, errstr); 665 return (-1); 666 667 case SSL_ERROR_WANT_CONNECT: 668 case SSL_ERROR_WANT_ACCEPT: 669 case SSL_ERROR_WANT_X509_LOOKUP: 670 default: 671 tls_set_ssl_errorx(ctx, "%s failed (%i)", prefix, ssl_err); 672 return (-1); 673 } 674 } 675 676 int 677 tls_handshake(struct tls *ctx) 678 { 679 int rv = -1; 680 681 tls_error_clear(&ctx->error); 682 683 if ((ctx->flags & (TLS_CLIENT | TLS_SERVER_CONN)) == 0) { 684 tls_set_errorx(ctx, "invalid operation for context"); 685 goto out; 686 } 687 688 if ((ctx->state & TLS_HANDSHAKE_COMPLETE) != 0) { 689 tls_set_errorx(ctx, "handshake already completed"); 690 goto out; 691 } 692 693 if ((ctx->flags & TLS_CLIENT) != 0) 694 rv = tls_handshake_client(ctx); 695 else if ((ctx->flags & TLS_SERVER_CONN) != 0) 696 rv = tls_handshake_server(ctx); 697 698 if (rv == 0) { 699 ctx->ssl_peer_cert = SSL_get_peer_certificate(ctx->ssl_conn); 700 ctx->ssl_peer_chain = SSL_get_peer_cert_chain(ctx->ssl_conn); 701 if (tls_conninfo_populate(ctx) == -1) 702 rv = -1; 703 if (ctx->ocsp == NULL) 704 ctx->ocsp = tls_ocsp_setup_from_peer(ctx); 705 } 706 out: 707 /* Prevent callers from performing incorrect error handling */ 708 errno = 0; 709 return (rv); 710 } 711 712 ssize_t 713 tls_read(struct tls *ctx, void *buf, size_t buflen) 714 { 715 ssize_t rv = -1; 716 int ssl_ret; 717 718 tls_error_clear(&ctx->error); 719 720 if ((ctx->state & TLS_HANDSHAKE_COMPLETE) == 0) { 721 if ((rv = tls_handshake(ctx)) != 0) 722 goto out; 723 } 724 725 if (buflen > INT_MAX) { 726 tls_set_errorx(ctx, "buflen too long"); 727 goto out; 728 } 729 730 ERR_clear_error(); 731 if ((ssl_ret = SSL_read(ctx->ssl_conn, buf, buflen)) > 0) { 732 rv = (ssize_t)ssl_ret; 733 goto out; 734 } 735 rv = (ssize_t)tls_ssl_error(ctx, ctx->ssl_conn, ssl_ret, "read"); 736 737 out: 738 /* Prevent callers from performing incorrect error handling */ 739 errno = 0; 740 return (rv); 741 } 742 743 ssize_t 744 tls_write(struct tls *ctx, const void *buf, size_t buflen) 745 { 746 ssize_t rv = -1; 747 int ssl_ret; 748 749 tls_error_clear(&ctx->error); 750 751 if ((ctx->state & TLS_HANDSHAKE_COMPLETE) == 0) { 752 if ((rv = tls_handshake(ctx)) != 0) 753 goto out; 754 } 755 756 if (buflen > INT_MAX) { 757 tls_set_errorx(ctx, "buflen too long"); 758 goto out; 759 } 760 761 ERR_clear_error(); 762 if ((ssl_ret = SSL_write(ctx->ssl_conn, buf, buflen)) > 0) { 763 rv = (ssize_t)ssl_ret; 764 goto out; 765 } 766 rv = (ssize_t)tls_ssl_error(ctx, ctx->ssl_conn, ssl_ret, "write"); 767 768 out: 769 /* Prevent callers from performing incorrect error handling */ 770 errno = 0; 771 return (rv); 772 } 773 774 int 775 tls_close(struct tls *ctx) 776 { 777 int ssl_ret; 778 int rv = 0; 779 780 tls_error_clear(&ctx->error); 781 782 if ((ctx->flags & (TLS_CLIENT | TLS_SERVER_CONN)) == 0) { 783 tls_set_errorx(ctx, "invalid operation for context"); 784 rv = -1; 785 goto out; 786 } 787 788 if (ctx->state & TLS_SSL_NEEDS_SHUTDOWN) { 789 ERR_clear_error(); 790 ssl_ret = SSL_shutdown(ctx->ssl_conn); 791 if (ssl_ret < 0) { 792 rv = tls_ssl_error(ctx, ctx->ssl_conn, ssl_ret, 793 "shutdown"); 794 if (rv == TLS_WANT_POLLIN || rv == TLS_WANT_POLLOUT) 795 goto out; 796 } 797 ctx->state &= ~TLS_SSL_NEEDS_SHUTDOWN; 798 } 799 800 if (ctx->socket != -1) { 801 if (shutdown(ctx->socket, SHUT_RDWR) != 0) { 802 if (rv == 0 && 803 errno != ENOTCONN && errno != ECONNRESET) { 804 tls_set_error(ctx, "shutdown"); 805 rv = -1; 806 } 807 } 808 if (close(ctx->socket) != 0) { 809 if (rv == 0) { 810 tls_set_error(ctx, "close"); 811 rv = -1; 812 } 813 } 814 ctx->socket = -1; 815 } 816 817 if ((ctx->state & TLS_EOF_NO_CLOSE_NOTIFY) != 0) { 818 tls_set_errorx(ctx, "EOF without close notify"); 819 rv = -1; 820 } 821 822 out: 823 /* Prevent callers from performing incorrect error handling */ 824 errno = 0; 825 return (rv); 826 } 827