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/*
* libwebsockets - mbedTLS-specific lws apis
*
* Copyright (C) 2010-2017 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation:
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include "private-libwebsockets.h"
void
lws_ssl_elaborate_error(void)
{
}
int
lws_context_init_ssl_library(struct lws_context_creation_info *info)
{
lwsl_info(" Compiled with MbedTLS support\n");
if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT))
lwsl_info(" SSL disabled: no LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT\n");
return 0;
}
LWS_VISIBLE void
lws_ssl_destroy(struct lws_vhost *vhost)
{
if (!lws_check_opt(vhost->context->options,
LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT))
return;
if (vhost->ssl_ctx)
SSL_CTX_free(vhost->ssl_ctx);
if (!vhost->user_supplied_ssl_ctx && vhost->ssl_client_ctx)
SSL_CTX_free(vhost->ssl_client_ctx);
if (vhost->x509_client_CA)
X509_free(vhost->x509_client_CA);
}
LWS_VISIBLE int
lws_ssl_capable_read(struct lws *wsi, unsigned char *buf, int len)
{
struct lws_context *context = wsi->context;
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
int n = 0, m;
if (!wsi->ssl)
return lws_ssl_capable_read_no_ssl(wsi, buf, len);
lws_stats_atomic_bump(context, pt, LWSSTATS_C_API_READ, 1);
errno = 0;
n = SSL_read(wsi->ssl, buf, len);
#if defined(LWS_WITH_ESP32)
if (!n && errno == ENOTCONN) {
lwsl_debug("%p: SSL_read ENOTCONN\n", wsi);
return LWS_SSL_CAPABLE_ERROR;
}
#endif
#if defined(LWS_WITH_STATS)
if (!wsi->seen_rx) {
lws_stats_atomic_bump(wsi->context, pt,
LWSSTATS_MS_SSL_RX_DELAY,
time_in_microseconds() - wsi->accept_start_us);
lws_stats_atomic_bump(wsi->context, pt,
LWSSTATS_C_SSL_CONNS_HAD_RX, 1);
wsi->seen_rx = 1;
}
#endif
lwsl_debug("%p: SSL_read says %d\n", wsi, n);
/* manpage: returning 0 means connection shut down */
if (!n) {
wsi->socket_is_permanently_unusable = 1;
return LWS_SSL_CAPABLE_ERROR;
}
if (n < 0) {
m = SSL_get_error(wsi->ssl, n);
lwsl_debug("%p: ssl err %d errno %d\n", wsi, m, errno);
if (m == SSL_ERROR_ZERO_RETURN ||
m == SSL_ERROR_SYSCALL)
return LWS_SSL_CAPABLE_ERROR;
if (m == SSL_ERROR_WANT_READ || SSL_want_read(wsi->ssl)) {
lwsl_debug("%s: WANT_READ\n", __func__);
lwsl_debug("%p: LWS_SSL_CAPABLE_MORE_SERVICE\n", wsi);
return LWS_SSL_CAPABLE_MORE_SERVICE;
}
if (m == SSL_ERROR_WANT_WRITE || SSL_want_write(wsi->ssl)) {
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lwsl_debug("%s: WANT_WRITE\n", __func__);
lwsl_debug("%p: LWS_SSL_CAPABLE_MORE_SERVICE\n", wsi);
return LWS_SSL_CAPABLE_MORE_SERVICE;
}
wsi->socket_is_permanently_unusable = 1;
return LWS_SSL_CAPABLE_ERROR;
}
lws_stats_atomic_bump(context, pt, LWSSTATS_B_READ, n);
if (wsi->vhost)
wsi->vhost->conn_stats.rx += n;
lws_restart_ws_ping_pong_timer(wsi);
/*
* if it was our buffer that limited what we read,
* check if SSL has additional data pending inside SSL buffers.
*
* Because these won't signal at the network layer with POLLIN
* and if we don't realize, this data will sit there forever
*/
if (n != len)
goto bail;
if (!wsi->ssl)
goto bail;
if (!SSL_pending(wsi->ssl))
goto bail;
if (wsi->pending_read_list_next)
return n;
if (wsi->pending_read_list_prev)
return n;
if (pt->pending_read_list == wsi)
return n;
/* add us to the linked list of guys with pending ssl */
if (pt->pending_read_list)
pt->pending_read_list->pending_read_list_prev = wsi;
wsi->pending_read_list_next = pt->pending_read_list;
wsi->pending_read_list_prev = NULL;
pt->pending_read_list = wsi;
return n;
bail:
lws_ssl_remove_wsi_from_buffered_list(wsi);
return n;
}
LWS_VISIBLE int
lws_ssl_pending(struct lws *wsi)
{
if (!wsi->ssl)
return 0;
return SSL_pending(wsi->ssl);
}
LWS_VISIBLE int
lws_ssl_capable_write(struct lws *wsi, unsigned char *buf, int len)
{
int n, m;
if (!wsi->ssl)
return lws_ssl_capable_write_no_ssl(wsi, buf, len);
n = SSL_write(wsi->ssl, buf, len);
if (n > 0)
return n;
m = SSL_get_error(wsi->ssl, n);
if (m != SSL_ERROR_SYSCALL) {
if (m == SSL_ERROR_WANT_READ || SSL_want_read(wsi->ssl)) {
lwsl_notice("%s: want read\n", __func__);
return LWS_SSL_CAPABLE_MORE_SERVICE;
}
if (m == SSL_ERROR_WANT_WRITE || SSL_want_write(wsi->ssl)) {
lws_set_blocking_send(wsi);
lwsl_notice("%s: want write\n", __func__);
return LWS_SSL_CAPABLE_MORE_SERVICE;
}
}
lwsl_debug("%s failed: %d\n",__func__, m);
wsi->socket_is_permanently_unusable = 1;
return LWS_SSL_CAPABLE_ERROR;
}
int openssl_SSL_CTX_private_data_index;
void
lws_ssl_info_callback(const SSL *ssl, int where, int ret)
{
struct lws *wsi;
struct lws_context *context;
struct lws_ssl_info si;
context = (struct lws_context *)SSL_CTX_get_ex_data(
SSL_get_SSL_CTX(ssl),
openssl_SSL_CTX_private_data_index);
if (!context)
return;
wsi = wsi_from_fd(context, SSL_get_fd(ssl));
if (!wsi)
return;
if (!(where & wsi->vhost->ssl_info_event_mask))
return;
si.where = where;
si.ret = ret;
if (user_callback_handle_rxflow(wsi->protocol->callback,
wsi, LWS_CALLBACK_SSL_INFO,
wsi->user_space, &si, 0))
lws_set_timeout(wsi, PENDING_TIMEOUT_KILLED_BY_SSL_INFO, -1);
}
LWS_VISIBLE int
lws_ssl_close(struct lws *wsi)
{
lws_sockfd_type n;
if (!wsi->ssl)
return 0; /* not handled */
#if defined (LWS_HAVE_SSL_SET_INFO_CALLBACK)
/* kill ssl callbacks, becausse we will remove the fd from the
* table linking it to the wsi
*/
if (wsi->vhost->ssl_info_event_mask)
SSL_set_info_callback(wsi->ssl, NULL);
#endif
n = SSL_get_fd(wsi->ssl);
if (!wsi->socket_is_permanently_unusable)
SSL_shutdown(wsi->ssl);
compatible_close(n);
SSL_free(wsi->ssl);
wsi->ssl = NULL;
if (wsi->context->simultaneous_ssl_restriction &&
wsi->context->simultaneous_ssl-- ==
wsi->context->simultaneous_ssl_restriction)
/* we made space and can do an accept */
lws_gate_accepts(wsi->context, 1);
#if defined(LWS_WITH_STATS)
wsi->context->updated = 1;
#endif
return 1; /* handled */
}
void
lws_ssl_SSL_CTX_destroy(struct lws_vhost *vhost)
{
if (vhost->ssl_ctx)
SSL_CTX_free(vhost->ssl_ctx);
if (!vhost->user_supplied_ssl_ctx && vhost->ssl_client_ctx)
SSL_CTX_free(vhost->ssl_client_ctx);
}
void
lws_ssl_context_destroy(struct lws_context *context)
{
}
lws_tls_ctx *
lws_tls_ctx_from_wsi(struct lws *wsi)
{
return SSL_get_SSL_CTX(wsi->ssl);
}
enum lws_ssl_capable_status
lws_tls_shutdown(struct lws *wsi)
{
int n = SSL_shutdown(wsi->ssl);
lwsl_debug("SSL_shutdown=%d for fd %d\n", n, wsi->desc.sockfd);
switch (n) {
case 1: /* successful completion */
n = shutdown(wsi->desc.sockfd, SHUT_WR);
return LWS_SSL_CAPABLE_DONE;
case 0: /* needs a retry */
lws_change_pollfd(wsi, 0, LWS_POLLIN);
return LWS_SSL_CAPABLE_MORE_SERVICE;
default: /* fatal error, or WANT */
n = SSL_get_error(wsi->ssl, n);
if (n != SSL_ERROR_SYSCALL && n != SSL_ERROR_SSL) {
if (SSL_want_read(wsi->ssl)) {
lwsl_debug("(wants read)\n");
lws_change_pollfd(wsi, 0, LWS_POLLIN);
return LWS_SSL_CAPABLE_MORE_SERVICE_READ;
}
if (SSL_want_write(wsi->ssl)) {
lwsl_debug("(wants write)\n");
lws_change_pollfd(wsi, 0, LWS_POLLOUT);
return LWS_SSL_CAPABLE_MORE_SERVICE_WRITE;
}
}
return LWS_SSL_CAPABLE_ERROR;
}
}