1 /* $OpenBSD: tls.c,v 1.87 2021/01/21 22:02:17 eric 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 int 388 tls_configure_ssl_keypair(struct tls *ctx, SSL_CTX *ssl_ctx, 389 struct tls_keypair *keypair, int required) 390 { 391 EVP_PKEY *pkey = NULL; 392 393 if (!required && 394 keypair->cert_mem == NULL && 395 keypair->key_mem == NULL) 396 return(0); 397 398 if (keypair->cert_mem != NULL) { 399 if (keypair->cert_len > INT_MAX) { 400 tls_set_errorx(ctx, "certificate too long"); 401 goto err; 402 } 403 404 if (SSL_CTX_use_certificate_chain_mem(ssl_ctx, 405 keypair->cert_mem, keypair->cert_len) != 1) { 406 tls_set_errorx(ctx, "failed to load certificate"); 407 goto err; 408 } 409 } 410 411 if (tls_keypair_to_pkey(ctx, keypair, &pkey) == -1) 412 goto err; 413 if (pkey != NULL) { 414 if (keypair->pubkey_hash != NULL) { 415 RSA *rsa; 416 /* XXX only RSA for now for relayd privsep */ 417 if ((rsa = EVP_PKEY_get1_RSA(pkey)) != NULL) { 418 RSA_set_ex_data(rsa, 0, keypair->pubkey_hash); 419 RSA_free(rsa); 420 } 421 } 422 423 if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1) { 424 tls_set_errorx(ctx, "failed to load private key"); 425 goto err; 426 } 427 EVP_PKEY_free(pkey); 428 pkey = NULL; 429 } 430 431 if (!ctx->config->skip_private_key_check && 432 SSL_CTX_check_private_key(ssl_ctx) != 1) { 433 tls_set_errorx(ctx, "private/public key mismatch"); 434 goto err; 435 } 436 437 return (0); 438 439 err: 440 EVP_PKEY_free(pkey); 441 442 return (-1); 443 } 444 445 int 446 tls_configure_ssl(struct tls *ctx, SSL_CTX *ssl_ctx) 447 { 448 SSL_CTX_clear_mode(ssl_ctx, SSL_MODE_AUTO_RETRY); 449 450 SSL_CTX_set_mode(ssl_ctx, SSL_MODE_ENABLE_PARTIAL_WRITE); 451 SSL_CTX_set_mode(ssl_ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER); 452 453 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_SSLv2); 454 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_SSLv3); 455 456 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TLSv1); 457 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TLSv1_1); 458 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TLSv1_2); 459 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TLSv1_3); 460 461 if ((ctx->config->protocols & TLS_PROTOCOL_TLSv1_0) == 0) 462 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1); 463 if ((ctx->config->protocols & TLS_PROTOCOL_TLSv1_1) == 0) 464 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1_1); 465 if ((ctx->config->protocols & TLS_PROTOCOL_TLSv1_2) == 0) 466 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1_2); 467 if ((ctx->config->protocols & TLS_PROTOCOL_TLSv1_3) == 0) 468 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1_3); 469 470 if (ctx->config->alpn != NULL) { 471 if (SSL_CTX_set_alpn_protos(ssl_ctx, ctx->config->alpn, 472 ctx->config->alpn_len) != 0) { 473 tls_set_errorx(ctx, "failed to set alpn"); 474 goto err; 475 } 476 } 477 478 if (ctx->config->ciphers != NULL) { 479 if (SSL_CTX_set_cipher_list(ssl_ctx, 480 ctx->config->ciphers) != 1) { 481 tls_set_errorx(ctx, "failed to set ciphers"); 482 goto err; 483 } 484 } 485 486 if (ctx->config->verify_time == 0) { 487 X509_VERIFY_PARAM_set_flags(ssl_ctx->param, 488 X509_V_FLAG_NO_CHECK_TIME); 489 } 490 491 /* Disable any form of session caching by default */ 492 SSL_CTX_set_session_cache_mode(ssl_ctx, SSL_SESS_CACHE_OFF); 493 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET); 494 495 return (0); 496 497 err: 498 return (-1); 499 } 500 501 static int 502 tls_ssl_cert_verify_cb(X509_STORE_CTX *x509_ctx, void *arg) 503 { 504 struct tls *ctx = arg; 505 int x509_err; 506 507 if (ctx->config->verify_cert == 0) 508 return (1); 509 510 if ((X509_verify_cert(x509_ctx)) < 0) { 511 tls_set_errorx(ctx, "X509 verify cert failed"); 512 return (0); 513 } 514 515 x509_err = X509_STORE_CTX_get_error(x509_ctx); 516 if (x509_err == X509_V_OK) 517 return (1); 518 519 tls_set_errorx(ctx, "certificate verification failed: %s", 520 X509_verify_cert_error_string(x509_err)); 521 522 return (0); 523 } 524 525 int 526 tls_configure_ssl_verify(struct tls *ctx, SSL_CTX *ssl_ctx, int verify) 527 { 528 size_t ca_len = ctx->config->ca_len; 529 char *ca_mem = ctx->config->ca_mem; 530 char *crl_mem = ctx->config->crl_mem; 531 size_t crl_len = ctx->config->crl_len; 532 char *ca_free = NULL; 533 STACK_OF(X509_INFO) *xis = NULL; 534 X509_STORE *store; 535 X509_INFO *xi; 536 BIO *bio = NULL; 537 int rv = -1; 538 int i; 539 540 SSL_CTX_set_verify(ssl_ctx, verify, NULL); 541 SSL_CTX_set_cert_verify_callback(ssl_ctx, tls_ssl_cert_verify_cb, ctx); 542 543 if (ctx->config->verify_depth >= 0) 544 SSL_CTX_set_verify_depth(ssl_ctx, ctx->config->verify_depth); 545 546 if (ctx->config->verify_cert == 0) 547 goto done; 548 549 /* If no CA has been specified, attempt to load the default. */ 550 if (ctx->config->ca_mem == NULL && ctx->config->ca_path == NULL) { 551 if (tls_config_load_file(&ctx->error, "CA", tls_default_ca_cert_file(), 552 &ca_mem, &ca_len) != 0) 553 goto err; 554 ca_free = ca_mem; 555 } 556 557 if (ca_mem != NULL) { 558 if (ca_len > INT_MAX) { 559 tls_set_errorx(ctx, "ca too long"); 560 goto err; 561 } 562 if (SSL_CTX_load_verify_mem(ssl_ctx, ca_mem, ca_len) != 1) { 563 tls_set_errorx(ctx, "ssl verify memory setup failure"); 564 goto err; 565 } 566 } else if (SSL_CTX_load_verify_locations(ssl_ctx, NULL, 567 ctx->config->ca_path) != 1) { 568 tls_set_errorx(ctx, "ssl verify locations failure"); 569 goto err; 570 } 571 572 if (crl_mem != NULL) { 573 if (crl_len > INT_MAX) { 574 tls_set_errorx(ctx, "crl too long"); 575 goto err; 576 } 577 if ((bio = BIO_new_mem_buf(crl_mem, crl_len)) == NULL) { 578 tls_set_errorx(ctx, "failed to create buffer"); 579 goto err; 580 } 581 if ((xis = PEM_X509_INFO_read_bio(bio, NULL, tls_password_cb, 582 NULL)) == NULL) { 583 tls_set_errorx(ctx, "failed to parse crl"); 584 goto err; 585 } 586 store = SSL_CTX_get_cert_store(ssl_ctx); 587 for (i = 0; i < sk_X509_INFO_num(xis); i++) { 588 xi = sk_X509_INFO_value(xis, i); 589 if (xi->crl == NULL) 590 continue; 591 if (!X509_STORE_add_crl(store, xi->crl)) { 592 tls_set_error(ctx, "failed to add crl"); 593 goto err; 594 } 595 xi->crl = NULL; 596 } 597 X509_VERIFY_PARAM_set_flags(store->param, 598 X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL); 599 } 600 601 done: 602 rv = 0; 603 604 err: 605 sk_X509_INFO_pop_free(xis, X509_INFO_free); 606 BIO_free(bio); 607 free(ca_free); 608 609 return (rv); 610 } 611 612 void 613 tls_free(struct tls *ctx) 614 { 615 if (ctx == NULL) 616 return; 617 618 tls_reset(ctx); 619 620 free(ctx); 621 } 622 623 void 624 tls_reset(struct tls *ctx) 625 { 626 struct tls_sni_ctx *sni, *nsni; 627 628 tls_config_free(ctx->config); 629 ctx->config = NULL; 630 631 SSL_CTX_free(ctx->ssl_ctx); 632 SSL_free(ctx->ssl_conn); 633 X509_free(ctx->ssl_peer_cert); 634 635 ctx->ssl_conn = NULL; 636 ctx->ssl_ctx = NULL; 637 ctx->ssl_peer_cert = NULL; 638 /* X509 objects in chain are freed with the SSL */ 639 ctx->ssl_peer_chain = NULL; 640 641 ctx->socket = -1; 642 ctx->state = 0; 643 644 free(ctx->servername); 645 ctx->servername = NULL; 646 647 free(ctx->error.msg); 648 ctx->error.msg = NULL; 649 ctx->error.num = -1; 650 651 tls_conninfo_free(ctx->conninfo); 652 ctx->conninfo = NULL; 653 654 tls_ocsp_free(ctx->ocsp); 655 ctx->ocsp = NULL; 656 657 for (sni = ctx->sni_ctx; sni != NULL; sni = nsni) { 658 nsni = sni->next; 659 tls_sni_ctx_free(sni); 660 } 661 ctx->sni_ctx = NULL; 662 663 ctx->read_cb = NULL; 664 ctx->write_cb = NULL; 665 ctx->cb_arg = NULL; 666 } 667 668 int 669 tls_ssl_error(struct tls *ctx, SSL *ssl_conn, int ssl_ret, const char *prefix) 670 { 671 const char *errstr = "unknown error"; 672 unsigned long err; 673 int ssl_err; 674 675 ssl_err = SSL_get_error(ssl_conn, ssl_ret); 676 switch (ssl_err) { 677 case SSL_ERROR_NONE: 678 case SSL_ERROR_ZERO_RETURN: 679 return (0); 680 681 case SSL_ERROR_WANT_READ: 682 return (TLS_WANT_POLLIN); 683 684 case SSL_ERROR_WANT_WRITE: 685 return (TLS_WANT_POLLOUT); 686 687 case SSL_ERROR_SYSCALL: 688 if ((err = ERR_peek_error()) != 0) { 689 errstr = ERR_error_string(err, NULL); 690 } else if (ssl_ret == 0) { 691 if ((ctx->state & TLS_HANDSHAKE_COMPLETE) != 0) { 692 ctx->state |= TLS_EOF_NO_CLOSE_NOTIFY; 693 return (0); 694 } 695 errstr = "unexpected EOF"; 696 } else if (ssl_ret == -1) { 697 errstr = strerror(errno); 698 } 699 tls_set_ssl_errorx(ctx, "%s failed: %s", prefix, errstr); 700 return (-1); 701 702 case SSL_ERROR_SSL: 703 if ((err = ERR_peek_error()) != 0) { 704 errstr = ERR_error_string(err, NULL); 705 } 706 tls_set_ssl_errorx(ctx, "%s failed: %s", prefix, errstr); 707 return (-1); 708 709 case SSL_ERROR_WANT_CONNECT: 710 case SSL_ERROR_WANT_ACCEPT: 711 case SSL_ERROR_WANT_X509_LOOKUP: 712 default: 713 tls_set_ssl_errorx(ctx, "%s failed (%i)", prefix, ssl_err); 714 return (-1); 715 } 716 } 717 718 int 719 tls_handshake(struct tls *ctx) 720 { 721 int rv = -1; 722 723 tls_error_clear(&ctx->error); 724 725 if ((ctx->flags & (TLS_CLIENT | TLS_SERVER_CONN)) == 0) { 726 tls_set_errorx(ctx, "invalid operation for context"); 727 goto out; 728 } 729 730 if ((ctx->state & TLS_HANDSHAKE_COMPLETE) != 0) { 731 tls_set_errorx(ctx, "handshake already completed"); 732 goto out; 733 } 734 735 if ((ctx->flags & TLS_CLIENT) != 0) 736 rv = tls_handshake_client(ctx); 737 else if ((ctx->flags & TLS_SERVER_CONN) != 0) 738 rv = tls_handshake_server(ctx); 739 740 if (rv == 0) { 741 ctx->ssl_peer_cert = SSL_get_peer_certificate(ctx->ssl_conn); 742 ctx->ssl_peer_chain = SSL_get_peer_cert_chain(ctx->ssl_conn); 743 if (tls_conninfo_populate(ctx) == -1) 744 rv = -1; 745 if (ctx->ocsp == NULL) 746 ctx->ocsp = tls_ocsp_setup_from_peer(ctx); 747 } 748 out: 749 /* Prevent callers from performing incorrect error handling */ 750 errno = 0; 751 return (rv); 752 } 753 754 ssize_t 755 tls_read(struct tls *ctx, void *buf, size_t buflen) 756 { 757 ssize_t rv = -1; 758 int ssl_ret; 759 760 tls_error_clear(&ctx->error); 761 762 if ((ctx->state & TLS_HANDSHAKE_COMPLETE) == 0) { 763 if ((rv = tls_handshake(ctx)) != 0) 764 goto out; 765 } 766 767 if (buflen > INT_MAX) { 768 tls_set_errorx(ctx, "buflen too long"); 769 goto out; 770 } 771 772 ERR_clear_error(); 773 if ((ssl_ret = SSL_read(ctx->ssl_conn, buf, buflen)) > 0) { 774 rv = (ssize_t)ssl_ret; 775 goto out; 776 } 777 rv = (ssize_t)tls_ssl_error(ctx, ctx->ssl_conn, ssl_ret, "read"); 778 779 out: 780 /* Prevent callers from performing incorrect error handling */ 781 errno = 0; 782 return (rv); 783 } 784 785 ssize_t 786 tls_write(struct tls *ctx, const void *buf, size_t buflen) 787 { 788 ssize_t rv = -1; 789 int ssl_ret; 790 791 tls_error_clear(&ctx->error); 792 793 if ((ctx->state & TLS_HANDSHAKE_COMPLETE) == 0) { 794 if ((rv = tls_handshake(ctx)) != 0) 795 goto out; 796 } 797 798 if (buflen > INT_MAX) { 799 tls_set_errorx(ctx, "buflen too long"); 800 goto out; 801 } 802 803 ERR_clear_error(); 804 if ((ssl_ret = SSL_write(ctx->ssl_conn, buf, buflen)) > 0) { 805 rv = (ssize_t)ssl_ret; 806 goto out; 807 } 808 rv = (ssize_t)tls_ssl_error(ctx, ctx->ssl_conn, ssl_ret, "write"); 809 810 out: 811 /* Prevent callers from performing incorrect error handling */ 812 errno = 0; 813 return (rv); 814 } 815 816 int 817 tls_close(struct tls *ctx) 818 { 819 int ssl_ret; 820 int rv = 0; 821 822 tls_error_clear(&ctx->error); 823 824 if ((ctx->flags & (TLS_CLIENT | TLS_SERVER_CONN)) == 0) { 825 tls_set_errorx(ctx, "invalid operation for context"); 826 rv = -1; 827 goto out; 828 } 829 830 if (ctx->state & TLS_SSL_NEEDS_SHUTDOWN) { 831 ERR_clear_error(); 832 ssl_ret = SSL_shutdown(ctx->ssl_conn); 833 if (ssl_ret < 0) { 834 rv = tls_ssl_error(ctx, ctx->ssl_conn, ssl_ret, 835 "shutdown"); 836 if (rv == TLS_WANT_POLLIN || rv == TLS_WANT_POLLOUT) 837 goto out; 838 } 839 ctx->state &= ~TLS_SSL_NEEDS_SHUTDOWN; 840 } 841 842 if (ctx->socket != -1) { 843 if (shutdown(ctx->socket, SHUT_RDWR) != 0) { 844 if (rv == 0 && 845 errno != ENOTCONN && errno != ECONNRESET) { 846 tls_set_error(ctx, "shutdown"); 847 rv = -1; 848 } 849 } 850 if (close(ctx->socket) != 0) { 851 if (rv == 0) { 852 tls_set_error(ctx, "close"); 853 rv = -1; 854 } 855 } 856 ctx->socket = -1; 857 } 858 859 if ((ctx->state & TLS_EOF_NO_CLOSE_NOTIFY) != 0) { 860 tls_set_errorx(ctx, "EOF without close notify"); 861 rv = -1; 862 } 863 864 out: 865 /* Prevent callers from performing incorrect error handling */ 866 errno = 0; 867 return (rv); 868 } 869