lib/ssl.c

   1 /*
   2  * libwebsockets - small server side websockets and web server implementation
   3  *
   4  * Copyright (C) 2010-2017 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
  24 /* workaround for mingw */
  25 #if !defined(ECONNABORTED)
  26 #define ECONNABORTED 103
  27 #endif
  28
  29 int lws_alloc_vfs_file(struct lws_context *context, const char *filename, uint8_t **buf,
  30                 lws_filepos_t *amount)
  31 {
  32         lws_filepos_t len;
  33         lws_fop_flags_t flags = LWS_O_RDONLY;
  34         lws_fop_fd_t fops_fd = lws_vfs_file_open(
  35                                 lws_get_fops(context), filename, &flags);
  36         int ret = 1;
  37
  38         if (!fops_fd)
  39                 return 1;
  40
  41         len = lws_vfs_get_length(fops_fd);
  42
  43         *buf = malloc(len);
  44         if (!buf)
  45                 goto bail;
  46
  47         if (lws_vfs_file_read(fops_fd, amount, *buf, len))
  48                 goto bail;
  49
  50         ret = 0;
  51 bail:
  52         lws_vfs_file_close(&fops_fd);
  53
  54         return ret;
  55 }
  56
  57 #if defined(LWS_WITH_ESP32)
  58 int alloc_file(struct lws_context *context, const char *filename, uint8_t **buf,
  59                lws_filepos_t *amount)
  60 {
  61         nvs_handle nvh;
  62         size_t s;
  63         int n = 0;
  64
  65         ESP_ERROR_CHECK(nvs_open("lws-station", NVS_READWRITE, &nvh));
  66         if (nvs_get_blob(nvh, filename, NULL, &s) != ESP_OK) {
  67                 n = 1;
  68                 goto bail;
  69         }
  70         *buf = malloc(s);
  71         if (!*buf) {
  72                 n = 2;
  73                 goto bail;
  74         }
  75         if (nvs_get_blob(nvh, filename, (char *)*buf, &s) != ESP_OK) {
  76                 free(*buf);
  77                 n = 1;
  78                 goto bail;
  79         }
  80
  81         *amount = s;
  82
  83 bail:
  84         nvs_close(nvh);
  85
  86         return n;
  87 }
  88 int alloc_pem_to_der_file(struct lws_context *context, const char *filename, uint8_t **buf,
  89                lws_filepos_t *amount)
  90 {
  91         uint8_t *pem, *p, *q, *end;
  92         lws_filepos_t len;
  93         int n;
  94
  95         n = alloc_file(context, filename, &pem, &len);
  96         if (n)
  97                 return n;
  98
  99         /* trim the first line */
 100
 101         p = pem;
 102         end = p + len;
 103         if (strncmp((char *)p, "-----", 5))
 104                 goto bail;
 105         p += 5;
 106         while (p < end && *p != '\n' && *p != '-')
 107                 p++;
 108
 109         if (*p != '-')
 110                 goto bail;
 111
 112         while (p < end && *p != '\n')
 113                 p++;
 114
 115         if (p >= end)
 116                 goto bail;
 117
 118         p++;
 119
 120         /* trim the last line */
 121
 122         q = end - 2;
 123
 124         while (q > pem && *q != '\n')
 125                 q--;
 126
 127         if (*q != '\n')
 128                 goto bail;
 129
 130         *q = '\0';
 131
 132         *amount = lws_b64_decode_string((char *)p, (char *)pem, len);
 133         *buf = pem;
 134
 135         return 0;
 136
 137 bail:
 138         free(pem);
 139
 140         return 4;
 141 }
 142 #endif
 143
 144 int openssl_websocket_private_data_index,
 145     openssl_SSL_CTX_private_data_index;
 146
 147 int lws_ssl_get_error(struct lws *wsi, int n)
 148 {
 149         if (!wsi->ssl)
 150                 return 99;
 151         lwsl_debug("%s: %p %d\n", __func__, wsi->ssl, n);
 152         return SSL_get_error(wsi->ssl, n);
 153 }
 154
 155 /* Copies a string describing the code returned by lws_ssl_get_error(),
 156  * which may also contain system error information in the case of SSL_ERROR_SYSCALL,
 157  * into buf up to len.
 158  * Returns a pointer to buf.
 159  *
 160  * Note: the lws_ssl_get_error() code is *not* an error code that can be passed
 161  * to ERR_error_string(),
 162  *
 163  * ret is the return value originally passed to lws_ssl_get_error(), needed to disambiguate
 164  * SYS_ERROR_SYSCALL.
 165  *
 166  * See man page for SSL_get_error().
 167  *
 168  * Not thread safe, uses strerror()
 169  */
 170 char* lws_ssl_get_error_string(int status, int ret, char *buf, size_t len) {
 171         switch (status) {
 172         case SSL_ERROR_NONE: return strncpy(buf, "SSL_ERROR_NONE", len);
 173         case SSL_ERROR_ZERO_RETURN: return strncpy(buf, "SSL_ERROR_ZERO_RETURN", len);
 174         case SSL_ERROR_WANT_READ: return strncpy(buf, "SSL_ERROR_WANT_READ", len);
 175         case SSL_ERROR_WANT_WRITE: return strncpy(buf, "SSL_ERROR_WANT_WRITE", len);
 176         case SSL_ERROR_WANT_CONNECT: return strncpy(buf, "SSL_ERROR_WANT_CONNECT", len);
 177         case SSL_ERROR_WANT_ACCEPT: return strncpy(buf, "SSL_ERROR_WANT_ACCEPT", len);
 178         case SSL_ERROR_WANT_X509_LOOKUP: return strncpy(buf, "SSL_ERROR_WANT_X509_LOOKUP", len);
 179         case SSL_ERROR_SYSCALL:
 180                 switch (ret) {
 181                 case 0:
 182                         lws_snprintf(buf, len, "SSL_ERROR_SYSCALL: EOF");
 183                         return buf;
 184                 case -1:
 185 #ifndef LWS_PLAT_OPTEE
 186                         lws_snprintf(buf, len, "SSL_ERROR_SYSCALL: %s", strerror(errno));
 187 #else
 188                         lws_snprintf(buf, len, "SSL_ERROR_SYSCALL: %d", errno);
 189 #endif
 190                         return buf;
 191                 default:
 192                         return strncpy(buf, "SSL_ERROR_SYSCALL", len);
 193         }
 194         case SSL_ERROR_SSL: return "SSL_ERROR_SSL";
 195         default: return "SSL_ERROR_UNKNOWN";
 196         }
 197 }
 198
 199 void
 200 lws_ssl_elaborate_error(void)
 201 {
 202 #if defined(LWS_WITH_ESP32)
 203 #else
 204         char buf[256];
 205         u_long err;
 206
 207         while ((err = ERR_get_error()) != 0) {
 208                 ERR_error_string_n(err, buf, sizeof(buf));
 209                 lwsl_err("*** %s\n", buf);
 210         }
 211 #endif
 212 }
 213
 214 #if !defined(LWS_WITH_ESP32)
 215
 216 static int
 217 lws_context_init_ssl_pem_passwd_cb(char * buf, int size, int rwflag, void *userdata)
 218 {
 219         struct lws_context_creation_info * info =
 220                         (struct lws_context_creation_info *)userdata;
 221
 222         strncpy(buf, info->ssl_private_key_password, size);
 223         buf[size - 1] = '\0';
 224
 225         return strlen(buf);
 226 }
 227
 228 void
 229 lws_ssl_bind_passphrase(SSL_CTX *ssl_ctx, struct lws_context_creation_info *info)
 230 {
 231         if (!info->ssl_private_key_password)
 232                 return;
 233         /*
 234          * password provided, set ssl callback and user data
 235          * for checking password which will be trigered during
 236          * SSL_CTX_use_PrivateKey_file function
 237          */
 238         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, (void *)info);
 239         SSL_CTX_set_default_passwd_cb(ssl_ctx, lws_context_init_ssl_pem_passwd_cb);
 240 }
 241 #endif
 242
 243 int
 244 lws_context_init_ssl_library(struct lws_context_creation_info *info)
 245 {
 246 #ifdef USE_WOLFSSL
 247 #ifdef USE_OLD_CYASSL
 248         lwsl_notice(" Compiled with CyaSSL support\n");
 249 #else
 250         lwsl_notice(" Compiled with wolfSSL support\n");
 251 #endif
 252 #else
 253 #if defined(LWS_USE_BORINGSSL)
 254         lwsl_notice(" Compiled with BoringSSL support\n");
 255 #else
 256         lwsl_notice(" Compiled with OpenSSL support\n");
 257 #endif
 258 #endif
 259         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT)) {
 260                 lwsl_notice(" SSL disabled: no LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT\n");
 261                 return 0;
 262         }
 263
 264         /* basic openssl init */
 265
 266         lwsl_notice("Doing SSL library init\n");
 267
 268 #if !defined(LWS_WITH_ESP32)
 269         SSL_library_init();
 270         OpenSSL_add_all_algorithms();
 271         SSL_load_error_strings();
 272
 273         openssl_websocket_private_data_index =
 274                 SSL_get_ex_new_index(0, "lws", NULL, NULL, NULL);
 275
 276         openssl_SSL_CTX_private_data_index = SSL_CTX_get_ex_new_index(0,
 277                         NULL, NULL, NULL, NULL);
 278 #endif
 279
 280         return 0;
 281 }
 282
 283 LWS_VISIBLE void
 284 lws_ssl_destroy(struct lws_vhost *vhost)
 285 {
 286         if (!lws_check_opt(vhost->context->options,
 287                            LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT))
 288                 return;
 289
 290         if (vhost->ssl_ctx)
 291                 SSL_CTX_free(vhost->ssl_ctx);
 292         if (!vhost->user_supplied_ssl_ctx && vhost->ssl_client_ctx)
 293                 SSL_CTX_free(vhost->ssl_client_ctx);
 294 #if !defined(LWS_WITH_ESP32)
 295
 296 // after 1.1.0 no need
 297 #if (OPENSSL_VERSION_NUMBER <  0x10100000)
 298 // <= 1.0.1f = old api, 1.0.1g+ = new api
 299 #if (OPENSSL_VERSION_NUMBER <= 0x1000106f) || defined(USE_WOLFSSL)
 300         ERR_remove_state(0);
 301 #else
 302 #if OPENSSL_VERSION_NUMBER >= 0x1010005f && \
 303     !defined(LIBRESSL_VERSION_NUMBER) && \
 304     !defined(OPENSSL_IS_BORINGSSL)
 305         ERR_remove_thread_state();
 306 #else
 307         ERR_remove_thread_state(NULL);
 308 #endif
 309 #endif
 310         ERR_free_strings();
 311         EVP_cleanup();
 312         CRYPTO_cleanup_all_ex_data();
 313 #endif
 314 #endif
 315 }
 316
 317 LWS_VISIBLE void
 318 lws_ssl_remove_wsi_from_buffered_list(struct lws *wsi)
 319 {
 320         struct lws_context *context = wsi->context;
 321         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 322
 323         if (!wsi->pending_read_list_prev &&
 324             !wsi->pending_read_list_next &&
 325             pt->pending_read_list != wsi)
 326                 /* we are not on the list */
 327                 return;
 328
 329         /* point previous guy's next to our next */
 330         if (!wsi->pending_read_list_prev)
 331                 pt->pending_read_list = wsi->pending_read_list_next;
 332         else
 333                 wsi->pending_read_list_prev->pending_read_list_next =
 334                         wsi->pending_read_list_next;
 335
 336         /* point next guy's previous to our previous */
 337         if (wsi->pending_read_list_next)
 338                 wsi->pending_read_list_next->pending_read_list_prev =
 339                         wsi->pending_read_list_prev;
 340
 341         wsi->pending_read_list_prev = NULL;
 342         wsi->pending_read_list_next = NULL;
 343 }
 344
 345 LWS_VISIBLE int
 346 lws_ssl_capable_read(struct lws *wsi, unsigned char *buf, int len)
 347 {
 348         struct lws_context *context = wsi->context;
 349         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 350         int n = 0;
 351 #if !defined(LWS_WITH_ESP32)
 352         int ssl_read_errno = 0;
 353 #endif
 354
 355         if (!wsi->ssl)
 356                 return lws_ssl_capable_read_no_ssl(wsi, buf, len);
 357
 358         lws_stats_atomic_bump(context, pt, LWSSTATS_C_API_READ, 1);
 359
 360         errno = 0;
 361         n = SSL_read(wsi->ssl, buf, len);
 362 #if defined(LWS_WITH_ESP32)
 363         if (!n && errno == ENOTCONN) {
 364                 lwsl_debug("%p: SSL_read ENOTCONN\n", wsi);
 365                 return LWS_SSL_CAPABLE_ERROR;
 366         }
 367 #endif
 368
 369         lwsl_debug("%p: SSL_read says %d\n", wsi, n);
 370         /* manpage: returning 0 means connection shut down */
 371         if (!n) {
 372                 n = lws_ssl_get_error(wsi, n);
 373                 lwsl_debug("%p: ssl err %d errno %d\n", wsi, n, errno);
 374                 if (n == SSL_ERROR_ZERO_RETURN)
 375                         return LWS_SSL_CAPABLE_ERROR;
 376
 377                 if (n == SSL_ERROR_SYSCALL) {
 378 #if !defined(LWS_WITH_ESP32)
 379                         int err = ERR_get_error();
 380                         if (err == 0 && (ssl_read_errno == EPIPE ||
 381                                          ssl_read_errno == ECONNABORTED ||
 382                                          ssl_read_errno == 0))
 383                                 return LWS_SSL_CAPABLE_ERROR;
 384 #endif
 385                 }
 386
 387                 lwsl_err("%s failed: %s\n",__func__,
 388                          ERR_error_string(lws_ssl_get_error(wsi, 0), NULL));
 389                 lws_ssl_elaborate_error();
 390
 391                 return LWS_SSL_CAPABLE_ERROR;
 392         }
 393
 394         if (n < 0) {
 395                 n = lws_ssl_get_error(wsi, n);
 396                 // lwsl_notice("get_ssl_err result %d\n", n);
 397                 if (n ==  SSL_ERROR_WANT_READ || SSL_want_read(wsi->ssl)) {
 398                         lwsl_debug("%s: WANT_READ\n", __func__);
 399                         lwsl_debug("%p: LWS_SSL_CAPABLE_MORE_SERVICE\n", wsi);
 400                         return LWS_SSL_CAPABLE_MORE_SERVICE;
 401                 }
 402                 if (n ==  SSL_ERROR_WANT_WRITE || SSL_want_write(wsi->ssl)) {
 403                         lwsl_debug("%s: WANT_WRITE\n", __func__);
 404                         lwsl_debug("%p: LWS_SSL_CAPABLE_MORE_SERVICE\n", wsi);
 405                         return LWS_SSL_CAPABLE_MORE_SERVICE;
 406                 }
 407
 408
 409                 lwsl_err("%s failed2: %s\n",__func__,
 410                                  ERR_error_string(lws_ssl_get_error(wsi, 0), NULL));
 411                         lws_ssl_elaborate_error();
 412
 413                 return LWS_SSL_CAPABLE_ERROR;
 414         }
 415
 416         lws_stats_atomic_bump(context, pt, LWSSTATS_B_READ, n);
 417
 418         if (wsi->vhost)
 419                 wsi->vhost->conn_stats.rx += n;
 420
 421         lws_restart_ws_ping_pong_timer(wsi);
 422
 423         /*
 424          * if it was our buffer that limited what we read,
 425          * check if SSL has additional data pending inside SSL buffers.
 426          *
 427          * Because these won't signal at the network layer with POLLIN
 428          * and if we don't realize, this data will sit there forever
 429          */
 430         if (n != len)
 431                 goto bail;
 432         if (!wsi->ssl)
 433                 goto bail;
 434
 435         if (!SSL_pending(wsi->ssl))
 436                 goto bail;
 437
 438         if (wsi->pending_read_list_next)
 439                 return n;
 440         if (wsi->pending_read_list_prev)
 441                 return n;
 442         if (pt->pending_read_list == wsi)
 443                 return n;
 444
 445         /* add us to the linked list of guys with pending ssl */
 446         if (pt->pending_read_list)
 447                 pt->pending_read_list->pending_read_list_prev = wsi;
 448
 449         wsi->pending_read_list_next = pt->pending_read_list;
 450         wsi->pending_read_list_prev = NULL;
 451         pt->pending_read_list = wsi;
 452
 453         return n;
 454 bail:
 455         lws_ssl_remove_wsi_from_buffered_list(wsi);
 456
 457         return n;
 458 }
 459
 460 LWS_VISIBLE int
 461 lws_ssl_pending(struct lws *wsi)
 462 {
 463         if (!wsi->ssl)
 464                 return 0;
 465
 466         return SSL_pending(wsi->ssl);
 467 }
 468
 469 LWS_VISIBLE int
 470 lws_ssl_capable_write(struct lws *wsi, unsigned char *buf, int len)
 471 {
 472         int n;
 473 #if !defined(LWS_WITH_ESP32)
 474         int ssl_read_errno = 0;
 475 #endif
 476
 477         if (!wsi->ssl)
 478                 return lws_ssl_capable_write_no_ssl(wsi, buf, len);
 479
 480         n = SSL_write(wsi->ssl, buf, len);
 481         if (n > 0)
 482                 return n;
 483
 484         n = lws_ssl_get_error(wsi, n);
 485         if (n == SSL_ERROR_WANT_READ || n == SSL_ERROR_WANT_WRITE) {
 486                 if (n == SSL_ERROR_WANT_WRITE) {
 487                         lwsl_debug("%s: WANT_WRITE\n", __func__);
 488                         lws_set_blocking_send(wsi);
 489                 }
 490                 return LWS_SSL_CAPABLE_MORE_SERVICE;
 491         }
 492
 493  if (n == SSL_ERROR_ZERO_RETURN)
 494   return LWS_SSL_CAPABLE_ERROR;
 495
 496 #if !defined(LWS_WITH_ESP32)
 497  if (n == SSL_ERROR_SYSCALL) {
 498
 499   int err = ERR_get_error();
 500   if (err == 0
 501     && (ssl_read_errno == EPIPE
 502      || ssl_read_errno == ECONNABORTED
 503      || ssl_read_errno == 0))
 504     return LWS_SSL_CAPABLE_ERROR;
 505  }
 506 #endif
 507
 508  lwsl_err("%s failed: %s\n",__func__,
 509    ERR_error_string(lws_ssl_get_error(wsi, 0), NULL));
 510         lws_ssl_elaborate_error();
 511
 512         return LWS_SSL_CAPABLE_ERROR;
 513 }
 514
 515 static int
 516 lws_gate_accepts(struct lws_context *context, int on)
 517 {
 518         struct lws_vhost *v = context->vhost_list;
 519
 520         lwsl_info("gating accepts %d\n", on);
 521
 522         while (v) {
 523                 if (v->use_ssl &&  v->lserv_wsi) /* gate ability to accept incoming connections */
 524                         if (lws_change_pollfd(v->lserv_wsi, (LWS_POLLIN) * !on, (LWS_POLLIN) * on))
 525                                 lwsl_err("Unable to set accept POLLIN %d\n", on);
 526
 527                 v = v->vhost_next;
 528         }
 529
 530         return 0;
 531 }
 532
 533 LWS_VISIBLE int
 534 lws_ssl_close(struct lws *wsi)
 535 {
 536         lws_sockfd_type n;
 537
 538         if (!wsi->ssl)
 539                 return 0; /* not handled */
 540
 541         n = SSL_get_fd(wsi->ssl);
 542         SSL_shutdown(wsi->ssl);
 543         compatible_close(n);
 544         SSL_free(wsi->ssl);
 545         wsi->ssl = NULL;
 546
 547         if (wsi->context->simultaneous_ssl_restriction &&
 548             wsi->context->simultaneous_ssl-- ==
 549                             wsi->context->simultaneous_ssl_restriction)
 550                 /* we made space and can do an accept */
 551                 lws_gate_accepts(wsi->context, 1);
 552
 553         return 1; /* handled */
 554 }
 555
 556 /* leave all wsi close processing to the caller */
 557
 558 LWS_VISIBLE int
 559 lws_server_socket_service_ssl(struct lws *wsi, lws_sockfd_type accept_fd)
 560 {
 561         struct lws_context *context = wsi->context;
 562         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 563         int n, m;
 564 #if !defined(USE_WOLFSSL) && !defined(LWS_WITH_ESP32)
 565         BIO *bio;
 566 #endif
 567         char buf[256];
 568
 569         if (!LWS_SSL_ENABLED(wsi->vhost))
 570                 return 0;
 571
 572         switch (wsi->mode) {
 573         case LWSCM_SSL_INIT:
 574         case LWSCM_SSL_INIT_RAW:
 575                 if (wsi->ssl)
 576                         lwsl_err("%s: leaking ssl\n", __func__);
 577                 if (accept_fd == LWS_SOCK_INVALID)
 578                         assert(0);
 579                 if (context->simultaneous_ssl_restriction &&
 580                     context->simultaneous_ssl >= context->simultaneous_ssl_restriction) {
 581                         lwsl_notice("unable to deal with SSL connection\n");
 582                         return 1;
 583                 }
 584                 errno = 0;
 585                 wsi->ssl = SSL_new(wsi->vhost->ssl_ctx);
 586                 if (wsi->ssl == NULL) {
 587                         lwsl_err("SSL_new failed: %d (errno %d)\n",
 588                                  lws_ssl_get_error(wsi, 0), errno);
 589
 590                         lws_ssl_elaborate_error();
 591                         if (accept_fd != LWS_SOCK_INVALID)
 592                                 compatible_close(accept_fd);
 593                         goto fail;
 594                 }
 595                 if (context->simultaneous_ssl_restriction &&
 596                     ++context->simultaneous_ssl == context->simultaneous_ssl_restriction)
 597                         /* that was the last allowed SSL connection */
 598                         lws_gate_accepts(context, 0);
 599
 600 #if !defined(LWS_WITH_ESP32)
 601                 SSL_set_ex_data(wsi->ssl,
 602                         openssl_websocket_private_data_index, wsi);
 603 #endif
 604                 SSL_set_fd(wsi->ssl, accept_fd);
 605
 606 #ifdef USE_WOLFSSL
 607 #ifdef USE_OLD_CYASSL
 608                 CyaSSL_set_using_nonblock(wsi->ssl, 1);
 609 #else
 610                 wolfSSL_set_using_nonblock(wsi->ssl, 1);
 611 #endif
 612 #else
 613 #if defined(LWS_WITH_ESP32)
 614                 lws_plat_set_socket_options(wsi->vhost, accept_fd);
 615 #else
 616                 SSL_set_mode(wsi->ssl, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 617                 bio = SSL_get_rbio(wsi->ssl);
 618                 if (bio)
 619                         BIO_set_nbio(bio, 1); /* nonblocking */
 620                 else
 621                         lwsl_notice("NULL rbio\n");
 622                 bio = SSL_get_wbio(wsi->ssl);
 623                 if (bio)
 624                         BIO_set_nbio(bio, 1); /* nonblocking */
 625                 else
 626                         lwsl_notice("NULL rbio\n");
 627 #endif
 628 #endif
 629
 630                 /*
 631                  * we are not accepted yet, but we need to enter ourselves
 632                  * as a live connection.  That way we can retry when more
 633                  * pieces come if we're not sorted yet
 634                  */
 635
 636                 if (wsi->mode == LWSCM_SSL_INIT)
 637                         wsi->mode = LWSCM_SSL_ACK_PENDING;
 638                 else
 639                         wsi->mode = LWSCM_SSL_ACK_PENDING_RAW;
 640
 641                 if (insert_wsi_socket_into_fds(context, wsi)) {
 642                         lwsl_err("%s: failed to insert into fds\n", __func__);
 643                         goto fail;
 644                 }
 645
 646                 lws_set_timeout(wsi, PENDING_TIMEOUT_SSL_ACCEPT,
 647                                 context->timeout_secs);
 648
 649                 lwsl_debug("inserted SSL accept into fds, trying SSL_accept\n");
 650
 651                 /* fallthru */
 652
 653         case LWSCM_SSL_ACK_PENDING:
 654         case LWSCM_SSL_ACK_PENDING_RAW:
 655                 if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
 656                         lwsl_err("%s: lws_change_pollfd failed\n", __func__);
 657                         goto fail;
 658                 }
 659
 660                 lws_latency_pre(context, wsi);
 661
 662                 if (wsi->vhost->allow_non_ssl_on_ssl_port) {
 663
 664                         n = recv(wsi->desc.sockfd, (char *)pt->serv_buf, context->pt_serv_buf_size,
 665                                  MSG_PEEK);
 666
 667                 /*
 668                  * optionally allow non-SSL connect on SSL listening socket
 669                  * This is disabled by default, if enabled it goes around any
 670                  * SSL-level access control (eg, client-side certs) so leave
 671                  * it disabled unless you know it's not a problem for you
 672                  */
 673
 674                         if (n >= 1 && pt->serv_buf[0] >= ' ') {
 675                                 /*
 676                                 * TLS content-type for Handshake is 0x16, and
 677                                 * for ChangeCipherSpec Record, it's 0x14
 678                                 *
 679                                 * A non-ssl session will start with the HTTP
 680                                 * method in ASCII.  If we see it's not a legit
 681                                 * SSL handshake kill the SSL for this
 682                                 * connection and try to handle as a HTTP
 683                                 * connection upgrade directly.
 684                                 */
 685                                 wsi->use_ssl = 0;
 686
 687                                 SSL_shutdown(wsi->ssl);
 688                                 SSL_free(wsi->ssl);
 689                                 wsi->ssl = NULL;
 690                                 if (lws_check_opt(context->options,
 691                                     LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS))
 692                                         wsi->redirect_to_https = 1;
 693                                 goto accepted;
 694                         }
 695                         if (!n) /*
 696                                  * connection is gone, or nothing to read
 697                                  * if it's gone, we will timeout on
 698                                  * PENDING_TIMEOUT_SSL_ACCEPT
 699                                  */
 700                                 break;
 701                         if (n < 0 && (LWS_ERRNO == LWS_EAGAIN ||
 702                                       LWS_ERRNO == LWS_EWOULDBLOCK)) {
 703                                 /*
 704                                  * well, we get no way to know ssl or not
 705                                  * so go around again waiting for something
 706                                  * to come and give us a hint, or timeout the
 707                                  * connection.
 708                                  */
 709                                 m = SSL_ERROR_WANT_READ;
 710                                 goto go_again;
 711                         }
 712                 }
 713
 714                 /* normal SSL connection processing path */
 715
 716 #if defined(LWS_WITH_STATS)
 717                 if (!wsi->accept_start_us)
 718                         wsi->accept_start_us = time_in_microseconds();
 719 #endif
 720
 721                 n = SSL_accept(wsi->ssl);
 722                 lws_latency(context, wsi,
 723                         "SSL_accept LWSCM_SSL_ACK_PENDING\n", n, n == 1);
 724                 lwsl_info("SSL_accept says %d\n", n);
 725                 if (n == 1)
 726                         goto accepted;
 727
 728                 m = lws_ssl_get_error(wsi, n);
 729
 730 #if defined(LWS_WITH_ESP32)
 731                 if (m == 5 && errno == 11)
 732                         m = SSL_ERROR_WANT_READ;
 733 #endif
 734
 735 go_again:
 736                 if (m == SSL_ERROR_WANT_READ || SSL_want_read(wsi->ssl)) {
 737                         if (lws_change_pollfd(wsi, 0, LWS_POLLIN)) {
 738                                 lwsl_err("%s: WANT_READ change_pollfd failed\n", __func__);
 739                                 goto fail;
 740                         }
 741
 742                         lwsl_info("SSL_ERROR_WANT_READ\n");
 743                         break;
 744                 }
 745                 if (m == SSL_ERROR_WANT_WRITE || SSL_want_write(wsi->ssl)) {
 746                         lwsl_debug("%s: WANT_WRITE\n", __func__);
 747
 748                         if (lws_change_pollfd(wsi, 0, LWS_POLLOUT)) {
 749                                 lwsl_err("%s: WANT_WRITE change_pollfd failed\n", __func__);
 750                                 goto fail;
 751                         }
 752
 753                         break;
 754                 }
 755                 lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_SSL_CONNECTIONS_FAILED, 1);
 756                 lwsl_err("SSL_accept failed socket %u: %s\n", wsi->desc.sockfd,
 757                          lws_ssl_get_error_string(m, n, buf, sizeof(buf)));
 758                 lws_ssl_elaborate_error();
 759                 goto fail;
 760
 761 accepted:
 762                 lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_SSL_CONNECTIONS_ACCEPTED, 1);
 763 #if defined(LWS_WITH_STATS)
 764                 lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_MS_SSL_CONNECTIONS_ACCEPTED_DELAY, time_in_microseconds() - wsi->accept_start_us);
 765 #endif
 766
 767                 /* OK, we are accepted... give him some time to negotiate */
 768                 lws_set_timeout(wsi, PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
 769                                 context->timeout_secs);
 770
 771                 if (wsi->mode == LWSCM_SSL_ACK_PENDING_RAW)
 772                         wsi->mode = LWSCM_RAW;
 773                 else
 774                         wsi->mode = LWSCM_HTTP_SERVING;
 775
 776                 lws_http2_configure_if_upgraded(wsi);
 777
 778                 lwsl_debug("accepted new SSL conn\n");
 779                 break;
 780         }
 781
 782         return 0;
 783
 784 fail:
 785         return 1;
 786 }
 787
 788 void
 789 lws_ssl_SSL_CTX_destroy(struct lws_vhost *vhost)
 790 {
 791         if (vhost->ssl_ctx)
 792                 SSL_CTX_free(vhost->ssl_ctx);
 793
 794         if (!vhost->user_supplied_ssl_ctx && vhost->ssl_client_ctx)
 795                 SSL_CTX_free(vhost->ssl_client_ctx);
 796 }
 797
 798 void
 799 lws_ssl_context_destroy(struct lws_context *context)
 800 {
 801
 802 #if !defined(LWS_WITH_ESP32)
 803
 804 // after 1.1.0 no need
 805 #if (OPENSSL_VERSION_NUMBER <  0x10100000)
 806 // <= 1.0.1f = old api, 1.0.1g+ = new api
 807 #if (OPENSSL_VERSION_NUMBER <= 0x1000106f) || defined(USE_WOLFSSL)
 808         ERR_remove_state(0);
 809 #else
 810 #if OPENSSL_VERSION_NUMBER >= 0x1010005f && \
 811     !defined(LIBRESSL_VERSION_NUMBER) && \
 812     !defined(OPENSSL_IS_BORINGSSL)
 813         ERR_remove_thread_state();
 814 #else
 815         ERR_remove_thread_state(NULL);
 816 #endif
 817 #endif
 818         ERR_free_strings();
 819         EVP_cleanup();
 820         CRYPTO_cleanup_all_ex_data();
 821 #endif
 822 #endif
 823 }