lib/ssl.c

   1 /*
   2  * libwebsockets - small server side websockets and web server implementation
   3  *
   4  * Copyright (C) 2010-2014 Andy Green <andy@warmcat.com>
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Lesser General Public
   8  *  License as published by the Free Software Foundation:
   9  *  version 2.1 of the License.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Lesser General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Lesser General Public
  17  *  License along with this library; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19  *  MA  02110-1301  USA
  20  */
  21
  22 #include "private-libwebsockets.h"
  23  #include <openssl/err.h>
  24
  25 int openssl_websocket_private_data_index;
  26
  27 static int lws_context_init_ssl_pem_passwd_cb(char * buf, int size, int rwflag, void *userdata)
  28 {
  29         struct lws_context_creation_info * info = (struct lws_context_creation_info *)userdata;
  30
  31         strncpy(buf, info->ssl_private_key_password, size);
  32         buf[size - 1] = '\0';
  33
  34         return strlen(buf);
  35 }
  36
  37 static void lws_ssl_bind_passphrase(SSL_CTX *ssl_ctx,
  38                                     struct lws_context_creation_info *info)
  39 {
  40         if (!info->ssl_private_key_password)
  41                 return;
  42         /*
  43          * password provided, set ssl callback and user data
  44          * for checking password which will be trigered during
  45          * SSL_CTX_use_PrivateKey_file function
  46          */
  47         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, (void *)info);
  48         SSL_CTX_set_default_passwd_cb(ssl_ctx,
  49                                       lws_context_init_ssl_pem_passwd_cb);
  50 }
  51
  52 #ifndef LWS_NO_SERVER
  53 static int
  54 OpenSSL_verify_callback(int preverify_ok, X509_STORE_CTX *x509_ctx)
  55 {
  56         SSL *ssl;
  57         int n;
  58         struct libwebsocket_context *context;
  59
  60         ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
  61                 SSL_get_ex_data_X509_STORE_CTX_idx());
  62
  63         /*
  64          * !!! nasty openssl requires the index to come as a library-scope
  65          * static
  66          */
  67         context = SSL_get_ex_data(ssl, openssl_websocket_private_data_index);
  68
  69         n = context->protocols[0].callback(NULL, NULL,
  70                 LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION,
  71                                                    x509_ctx, ssl, preverify_ok);
  72
  73         /* convert return code from 0 = OK to 1 = OK */
  74         return !n;
  75 }
  76
  77 LWS_VISIBLE int
  78 lws_context_init_server_ssl(struct lws_context_creation_info *info,
  79                      struct libwebsocket_context *context)
  80 {
  81         SSL_METHOD *method;
  82         int error;
  83         int n;
  84
  85         if (info->port != CONTEXT_PORT_NO_LISTEN) {
  86
  87                 context->use_ssl = info->ssl_cert_filepath != NULL;
  88
  89 #ifdef USE_CYASSL
  90                 lwsl_notice(" Compiled with CYASSL support\n");
  91 #else
  92                 lwsl_notice(" Compiled with OpenSSL support\n");
  93 #endif
  94
  95                 if (info->ssl_cipher_list)
  96                         lwsl_notice(" SSL ciphers: '%s'\n", info->ssl_cipher_list);
  97
  98                 if (context->use_ssl)
  99                         lwsl_notice(" Using SSL mode\n");
 100                 else
 101                         lwsl_notice(" Using non-SSL mode\n");
 102         }
 103
 104         /* basic openssl init */
 105
 106         SSL_library_init();
 107
 108         OpenSSL_add_all_algorithms();
 109         SSL_load_error_strings();
 110
 111         openssl_websocket_private_data_index =
 112                 SSL_get_ex_new_index(0, "libwebsockets", NULL, NULL, NULL);
 113
 114         /*
 115          * Firefox insists on SSLv23 not SSLv3
 116          * Konq disables SSLv2 by default now, SSLv23 works
 117          *
 118          * SSLv23_server_method() is the openssl method for "allow all TLS
 119          * versions", compared to e.g. TLSv1_2_server_method() which only allows
 120          * tlsv1.2. Unwanted versions must be disabled using SSL_CTX_set_options()
 121          */
 122
 123         method = (SSL_METHOD *)SSLv23_server_method();
 124         if (!method) {
 125                 error = ERR_get_error();
 126                 lwsl_err("problem creating ssl method %lu: %s\n",
 127                         error, ERR_error_string(error,
 128                                               (char *)context->service_buffer));
 129                 return 1;
 130         }
 131         context->ssl_ctx = SSL_CTX_new(method); /* create context */
 132         if (!context->ssl_ctx) {
 133                 error = ERR_get_error();
 134                 lwsl_err("problem creating ssl context %lu: %s\n",
 135                         error, ERR_error_string(error,
 136                                               (char *)context->service_buffer));
 137                 return 1;
 138         }
 139
 140         /* Disable SSLv2 and SSLv3 */
 141         SSL_CTX_set_options(context->ssl_ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
 142 #ifdef SSL_OP_NO_COMPRESSION
 143         SSL_CTX_set_options(context->ssl_ctx, SSL_OP_NO_COMPRESSION);
 144 #endif
 145         SSL_CTX_set_options(context->ssl_ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
 146         if (info->ssl_cipher_list)
 147                 SSL_CTX_set_cipher_list(context->ssl_ctx,
 148                                                 info->ssl_cipher_list);
 149
 150         /* as a server, are we requiring clients to identify themselves? */
 151
 152         if (info->options &
 153                         LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT) {
 154
 155                 /* absolutely require the client cert */
 156
 157                 SSL_CTX_set_verify(context->ssl_ctx,
 158                        SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
 159                                                        OpenSSL_verify_callback);
 160
 161                 /*
 162                  * give user code a chance to load certs into the server
 163                  * allowing it to verify incoming client certs
 164                  */
 165
 166                 context->protocols[0].callback(context, NULL,
 167                         LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS,
 168                                                      context->ssl_ctx, NULL, 0);
 169         }
 170
 171         if (info->options & LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT) {
 172                 /* Normally SSL listener rejects non-ssl, optionally allow */
 173                 context->allow_non_ssl_on_ssl_port = 1;
 174         }
 175
 176         if (context->use_ssl) {
 177
 178                 /* openssl init for server sockets */
 179
 180                 /* set the local certificate from CertFile */
 181                 n = SSL_CTX_use_certificate_chain_file(context->ssl_ctx,
 182                                         info->ssl_cert_filepath);
 183                 if (n != 1) {
 184                         error = ERR_get_error();
 185                         lwsl_err("problem getting cert '%s' %lu: %s\n",
 186                                 info->ssl_cert_filepath,
 187                                 error,
 188                                 ERR_error_string(error,
 189                                               (char *)context->service_buffer));
 190                         return 1;
 191                 }
 192                 lws_ssl_bind_passphrase(context->ssl_ctx, info);
 193
 194                 if (info->ssl_private_key_filepath != NULL) {
 195                         /* set the private key from KeyFile */
 196                         if (SSL_CTX_use_PrivateKey_file(context->ssl_ctx,
 197                                      info->ssl_private_key_filepath,
 198                                                        SSL_FILETYPE_PEM) != 1) {
 199                                 error = ERR_get_error();
 200                                 lwsl_err("ssl problem getting key '%s' %lu: %s\n",
 201                                         info->ssl_private_key_filepath,
 202                                                 error,
 203                                                 ERR_error_string(error,
 204                                                       (char *)context->service_buffer));
 205                                 return 1;
 206                         }
 207                 }
 208                 else {
 209                         if (context->protocols[0].callback(context, NULL,
 210                                 LWS_CALLBACK_OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY,
 211                                                 context->ssl_ctx, NULL, 0))
 212                                 lwsl_err("ssl private key not set\n");
 213                                 return 1;
 214                 }
 215
 216                 /* verify private key */
 217                 if (!SSL_CTX_check_private_key(context->ssl_ctx)) {
 218                         lwsl_err("Private SSL key doesn't match cert\n");
 219                         return 1;
 220                 }
 221
 222                 /*
 223                  * SSL is happy and has a cert it's content with
 224                  * If we're supporting HTTP2, initialize that
 225                  */
 226
 227                 lws_context_init_http2_ssl(context);
 228         }
 229
 230         return 0;
 231 }
 232 #endif
 233
 234 LWS_VISIBLE void
 235 lws_ssl_destroy(struct libwebsocket_context *context)
 236 {
 237         if (context->ssl_ctx)
 238                 SSL_CTX_free(context->ssl_ctx);
 239         if (!context->user_supplied_ssl_ctx && context->ssl_client_ctx)
 240                 SSL_CTX_free(context->ssl_client_ctx);
 241
 242 #if (OPENSSL_VERSION_NUMBER < 0x01000000) || defined(USE_CYASSL)
 243         ERR_remove_state(0);
 244 #else
 245         ERR_remove_thread_state(NULL);
 246 #endif
 247         ERR_free_strings();
 248         EVP_cleanup();
 249         CRYPTO_cleanup_all_ex_data();
 250 }
 251
 252 LWS_VISIBLE void
 253 libwebsockets_decode_ssl_error(void)
 254 {
 255         char buf[256];
 256         u_long err;
 257
 258         while ((err = ERR_get_error()) != 0) {
 259                 ERR_error_string_n(err, buf, sizeof(buf));
 260                 lwsl_err("*** %lu %s\n", err, buf);
 261         }
 262 }
 263
 264 #ifndef LWS_NO_CLIENT
 265
 266 int lws_context_init_client_ssl(struct lws_context_creation_info *info,
 267                             struct libwebsocket_context *context)
 268 {
 269         int error;
 270         int n;
 271         SSL_METHOD *method;
 272
 273         if (info->provided_client_ssl_ctx) {
 274                 /* use the provided OpenSSL context if given one */
 275                 context->ssl_client_ctx = info->provided_client_ssl_ctx;
 276                 /* nothing for lib to delete */
 277                 context->user_supplied_ssl_ctx = 1;
 278                 return 0;
 279         }
 280
 281         if (info->port != CONTEXT_PORT_NO_LISTEN)
 282                 return 0;
 283
 284         /* basic openssl init */
 285
 286         SSL_library_init();
 287
 288         OpenSSL_add_all_algorithms();
 289         SSL_load_error_strings();
 290
 291         method = (SSL_METHOD *)SSLv23_client_method();
 292         if (!method) {
 293                 error = ERR_get_error();
 294                 lwsl_err("problem creating ssl method %lu: %s\n",
 295                         error, ERR_error_string(error,
 296                                       (char *)context->service_buffer));
 297                 return 1;
 298         }
 299         /* create context */
 300         context->ssl_client_ctx = SSL_CTX_new(method);
 301         if (!context->ssl_client_ctx) {
 302                 error = ERR_get_error();
 303                 lwsl_err("problem creating ssl context %lu: %s\n",
 304                         error, ERR_error_string(error,
 305                                       (char *)context->service_buffer));
 306                 return 1;
 307         }
 308
 309 #ifdef SSL_OP_NO_COMPRESSION
 310         SSL_CTX_set_options(context->ssl_client_ctx,
 311                                                  SSL_OP_NO_COMPRESSION);
 312 #endif
 313         SSL_CTX_set_options(context->ssl_client_ctx,
 314                                        SSL_OP_CIPHER_SERVER_PREFERENCE);
 315         if (info->ssl_cipher_list)
 316                 SSL_CTX_set_cipher_list(context->ssl_client_ctx,
 317                                                 info->ssl_cipher_list);
 318
 319 #ifdef LWS_SSL_CLIENT_USE_OS_CA_CERTS
 320         if (!(info->options & LWS_SERVER_OPTION_DISABLE_OS_CA_CERTS))
 321                 /* loads OS default CA certs */
 322                 SSL_CTX_set_default_verify_paths(context->ssl_client_ctx);
 323 #endif
 324
 325         /* openssl init for cert verification (for client sockets) */
 326         if (!info->ssl_ca_filepath) {
 327                 if (!SSL_CTX_load_verify_locations(
 328                         context->ssl_client_ctx, NULL,
 329                                              LWS_OPENSSL_CLIENT_CERTS))
 330                         lwsl_err(
 331                             "Unable to load SSL Client certs from %s "
 332                             "(set by --with-client-cert-dir= "
 333                             "in configure) --  client ssl isn't "
 334                             "going to work", LWS_OPENSSL_CLIENT_CERTS);
 335         } else
 336                 if (!SSL_CTX_load_verify_locations(
 337                         context->ssl_client_ctx, info->ssl_ca_filepath,
 338                                                           NULL))
 339                         lwsl_err(
 340                                 "Unable to load SSL Client certs "
 341                                 "file from %s -- client ssl isn't "
 342                                 "going to work", info->ssl_ca_filepath);
 343                 else
 344                         lwsl_info("loaded ssl_ca_filepath\n");
 345
 346         /*
 347          * callback allowing user code to load extra verification certs
 348          * helping the client to verify server identity
 349          */
 350
 351         /* support for client-side certificate authentication */
 352         if (info->ssl_cert_filepath) {
 353                 n = SSL_CTX_use_certificate_chain_file(
 354                         context->ssl_client_ctx,
 355                                         info->ssl_cert_filepath);
 356                 if (n != 1) {
 357                         lwsl_err("problem getting cert '%s' %lu: %s\n",
 358                                 info->ssl_cert_filepath,
 359                                 ERR_get_error(),
 360                                 ERR_error_string(ERR_get_error(),
 361                                 (char *)context->service_buffer));
 362                         return 1;
 363                 }
 364         }
 365         if (info->ssl_private_key_filepath) {
 366                 lws_ssl_bind_passphrase(context->ssl_client_ctx, info);
 367                 /* set the private key from KeyFile */
 368                 if (SSL_CTX_use_PrivateKey_file(context->ssl_client_ctx,
 369                     info->ssl_private_key_filepath, SSL_FILETYPE_PEM) != 1) {
 370                         lwsl_err("use_PrivateKey_file '%s' %lu: %s\n",
 371                                 info->ssl_private_key_filepath,
 372                                 ERR_get_error(),
 373                                 ERR_error_string(ERR_get_error(),
 374                                       (char *)context->service_buffer));
 375                         return 1;
 376                 }
 377
 378                 /* verify private key */
 379                 if (!SSL_CTX_check_private_key(
 380                                         context->ssl_client_ctx)) {
 381                         lwsl_err("Private SSL key doesn't match cert\n");
 382                         return 1;
 383                 }
 384         }
 385
 386         context->protocols[0].callback(context, NULL,
 387                 LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS,
 388                 context->ssl_client_ctx, NULL, 0);
 389
 390         return 0;
 391 }
 392 #endif
 393
 394 LWS_VISIBLE int
 395 lws_ssl_capable_read(struct libwebsocket_context *context,
 396                      struct libwebsocket *wsi, unsigned char *buf, int len)
 397 {
 398         int n;
 399
 400         if (!wsi->ssl)
 401                 return lws_ssl_capable_read_no_ssl(context, wsi, buf, len);
 402
 403         wsi->buffered_reads_pending = 0;
 404
 405         n = SSL_read(wsi->ssl, buf, len);
 406         if (n >= 0) {
 407                 /*
 408                  * if it was our buffer that limited what we read,
 409                  * check if SSL has additional data pending inside SSL buffers.
 410                  *
 411                  * Because these won't signal at the network layer with POLLIN
 412                  * and if we don't realize, this data will sit there forever
 413                  */
 414                 if (n == len && wsi->ssl && SSL_pending(wsi->ssl)) {
 415                         context->ssl_flag_buffered_reads = 1;
 416                         wsi->buffered_reads_pending = 1;
 417                 }
 418
 419                 return n;
 420         }
 421         n = SSL_get_error(wsi->ssl, n);
 422         if (n ==  SSL_ERROR_WANT_READ || n ==  SSL_ERROR_WANT_WRITE)
 423                 return LWS_SSL_CAPABLE_MORE_SERVICE;
 424
 425         return LWS_SSL_CAPABLE_ERROR;
 426 }
 427
 428 LWS_VISIBLE int
 429 lws_ssl_capable_write(struct libwebsocket *wsi, unsigned char *buf, int len)
 430 {
 431         int n;
 432
 433         if (!wsi->ssl)
 434                 return lws_ssl_capable_write_no_ssl(wsi, buf, len);
 435
 436         n = SSL_write(wsi->ssl, buf, len);
 437         if (n >= 0)
 438                 return n;
 439
 440         n = SSL_get_error(wsi->ssl, n);
 441         if (n == SSL_ERROR_WANT_READ || n == SSL_ERROR_WANT_WRITE) {
 442                 if (n == SSL_ERROR_WANT_WRITE)
 443                         lws_set_blocking_send(wsi);
 444                 return LWS_SSL_CAPABLE_MORE_SERVICE;
 445         }
 446
 447         return LWS_SSL_CAPABLE_ERROR;
 448 }
 449
 450 LWS_VISIBLE int
 451 lws_ssl_close(struct libwebsocket *wsi)
 452 {
 453         int n;
 454
 455         if (!wsi->ssl)
 456                 return 0; /* not handled */
 457
 458         n = SSL_get_fd(wsi->ssl);
 459         SSL_shutdown(wsi->ssl);
 460         compatible_close(n);
 461         SSL_free(wsi->ssl);
 462
 463         return 1; /* handled */
 464 }
 465
 466 LWS_VISIBLE int
 467 lws_server_socket_service_ssl(struct libwebsocket_context *context,
 468                 struct libwebsocket **pwsi, struct libwebsocket *new_wsi,
 469                         int accept_fd, struct libwebsocket_pollfd *pollfd)
 470 {
 471         int n, m;
 472         struct libwebsocket *wsi = *pwsi;
 473 #ifndef USE_CYASSL
 474         BIO *bio;
 475 #endif
 476
 477         if (!LWS_SSL_ENABLED(context))
 478                 return 0;
 479
 480         switch (wsi->mode) {
 481         case LWS_CONNMODE_SERVER_LISTENER:
 482
 483                 if (!new_wsi) {
 484                         lwsl_err("no new_wsi\n");
 485                         return 0;
 486                 }
 487
 488                 new_wsi->ssl = SSL_new(context->ssl_ctx);
 489                 if (new_wsi->ssl == NULL) {
 490                         lwsl_err("SSL_new failed: %s\n",
 491                             ERR_error_string(SSL_get_error(
 492                             new_wsi->ssl, 0), NULL));
 493                             libwebsockets_decode_ssl_error();
 494                         lws_free(new_wsi);
 495                         compatible_close(accept_fd);
 496                         break;
 497                 }
 498
 499                 SSL_set_ex_data(new_wsi->ssl,
 500                         openssl_websocket_private_data_index, context);
 501
 502                 SSL_set_fd(new_wsi->ssl, accept_fd);
 503
 504 #ifdef USE_CYASSL
 505                 CyaSSL_set_using_nonblock(new_wsi->ssl, 1);
 506 #else
 507                 SSL_set_mode(new_wsi->ssl, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 508                 bio = SSL_get_rbio(new_wsi->ssl);
 509                 if (bio)
 510                         BIO_set_nbio(bio, 1); /* nonblocking */
 511                 else
 512                         lwsl_notice("NULL rbio\n");
 513                 bio = SSL_get_wbio(new_wsi->ssl);
 514                 if (bio)
 515                         BIO_set_nbio(bio, 1); /* nonblocking */
 516                 else
 517                         lwsl_notice("NULL rbio\n");
 518 #endif
 519
 520                 /*
 521                  * we are not accepted yet, but we need to enter ourselves
 522                  * as a live connection.  That way we can retry when more
 523                  * pieces come if we're not sorted yet
 524                  */
 525
 526                 *pwsi = new_wsi;
 527                 wsi = *pwsi;
 528                 wsi->mode = LWS_CONNMODE_SSL_ACK_PENDING;
 529                 insert_wsi_socket_into_fds(context, wsi);
 530
 531                 libwebsocket_set_timeout(wsi, PENDING_TIMEOUT_SSL_ACCEPT,
 532                                                         AWAITING_TIMEOUT);
 533
 534                 lwsl_info("inserted SSL accept into fds, trying SSL_accept\n");
 535
 536                 /* fallthru */
 537
 538         case LWS_CONNMODE_SSL_ACK_PENDING:
 539
 540                 if (lws_change_pollfd(wsi, LWS_POLLOUT, 0))
 541                         goto fail;
 542
 543                 lws_libev_io(context, wsi, LWS_EV_STOP | LWS_EV_WRITE);
 544
 545                 lws_latency_pre(context, wsi);
 546
 547                 n = recv(wsi->sock, context->service_buffer,
 548                         sizeof(context->service_buffer), MSG_PEEK);
 549
 550                 /*
 551                  * optionally allow non-SSL connect on SSL listening socket
 552                  * This is disabled by default, if enabled it goes around any
 553                  * SSL-level access control (eg, client-side certs) so leave
 554                  * it disabled unless you know it's not a problem for you
 555                  */
 556
 557                 if (context->allow_non_ssl_on_ssl_port && n >= 1 &&
 558                                         context->service_buffer[0] >= ' ') {
 559                         /*
 560                          * TLS content-type for Handshake is 0x16
 561                          * TLS content-type for ChangeCipherSpec Record is 0x14
 562                          *
 563                          * A non-ssl session will start with the HTTP method in
 564                          * ASCII.  If we see it's not a legit SSL handshake
 565                          * kill the SSL for this connection and try to handle
 566                          * as a HTTP connection upgrade directly.
 567                          */
 568                         wsi->use_ssl = 0;
 569                         SSL_shutdown(wsi->ssl);
 570                         SSL_free(wsi->ssl);
 571                         wsi->ssl = NULL;
 572                         goto accepted;
 573                 }
 574
 575                 /* normal SSL connection processing path */
 576
 577                 n = SSL_accept(wsi->ssl);
 578                 lws_latency(context, wsi,
 579                         "SSL_accept LWS_CONNMODE_SSL_ACK_PENDING\n", n, n == 1);
 580
 581                 if (n == 1)
 582                         goto accepted;
 583
 584                 m = SSL_get_error(wsi->ssl, n);
 585                 lwsl_debug("SSL_accept failed %d / %s\n",
 586                                                   m, ERR_error_string(m, NULL));
 587
 588                 if (m == SSL_ERROR_WANT_READ) {
 589                         if (lws_change_pollfd(wsi, 0, LWS_POLLIN))
 590                                 goto fail;
 591
 592                         lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_READ);
 593
 594                         lwsl_info("SSL_ERROR_WANT_READ\n");
 595                         break;
 596                 }
 597                 if (m == SSL_ERROR_WANT_WRITE) {
 598                         if (lws_change_pollfd(wsi, 0, LWS_POLLOUT))
 599                                 goto fail;
 600
 601                         lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_WRITE);
 602                         break;
 603                 }
 604                 lwsl_debug("SSL_accept failed skt %u: %s\n",
 605                                          pollfd->fd, ERR_error_string(m, NULL));
 606                 goto fail;
 607
 608 accepted:
 609                 /* OK, we are accepted... give him some time to negotiate */
 610                 libwebsocket_set_timeout(wsi,
 611                         PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
 612                                                         AWAITING_TIMEOUT);
 613
 614                 wsi->mode = LWS_CONNMODE_HTTP_SERVING;
 615
 616                 lws_http2_configure_if_upgraded(wsi);
 617
 618                 lwsl_debug("accepted new SSL conn\n");
 619                 break;
 620         }
 621
 622         return 0;
 623
 624 fail:
 625         return 1;
 626 }
 627
 628 LWS_VISIBLE void
 629 lws_ssl_context_destroy(struct libwebsocket_context *context)
 630 {
 631         if (context->ssl_ctx)
 632                 SSL_CTX_free(context->ssl_ctx);
 633         if (!context->user_supplied_ssl_ctx && context->ssl_client_ctx)
 634                 SSL_CTX_free(context->ssl_client_ctx);
 635
 636 #if (OPENSSL_VERSION_NUMBER < 0x01000000) || defined(USE_CYASSL)
 637         ERR_remove_state(0);
 638 #else
 639         ERR_remove_thread_state(NULL);
 640 #endif
 641         ERR_free_strings();
 642         EVP_cleanup();
 643         CRYPTO_cleanup_all_ex_data();
 644 }