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/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010-2016 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"
#if defined(LWS_USE_POLARSSL)
static const int ciphers[] =
{
TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
TLS_RSA_WITH_AES_256_CBC_SHA,
TLS_RSA_WITH_AES_128_CBC_SHA,
0
};
static int urandom_bytes(void *ctx, unsigned char *dest, size_t len)
{
int cur;
int fd = open("/dev/urandom", O_RDONLY);
while (len) {
cur = read(fd, dest, len);
if (cur < 0)
continue;
len -= cur;
}
close(fd);
return 0;
}
static void pssl_debug(void *ctx, int level, const char *str)
{
lwsl_err("PolarSSL [level %d]: %s", level, str);
}
#endif
int openssl_websocket_private_data_index,
openssl_SSL_CTX_private_data_index;
int lws_ssl_get_error(struct lws *wsi, int n)
{
#if defined(LWS_USE_POLARSSL)
#define ERR_error_string(a, b) ""
return n;
#else
#if defined(LWS_USE_MBEDTLS)
return n;
#else
return SSL_get_error(wsi->ssl, n);
#endif
#endif
}
void
lws_ssl_elaborate_error(void)
{
#if defined(LWS_USE_POLARSSL)
#else
#if defined(LWS_USE_MBEDTLS)
#else
char buf[256];
u_long err;
while ((err = ERR_get_error()) != 0) {
ERR_error_string_n(err, buf, sizeof(buf));
lwsl_err("*** %s\n", buf);
}
#endif
#endif
}
#if defined(LWS_USE_POLARSSL)
#else
#if defined(LWS_USE_MBEDTLS)
#else
static int
lws_context_init_ssl_pem_passwd_cb(char * buf, int size, int rwflag, void *userdata)
{
struct lws_context_creation_info * info =
(struct lws_context_creation_info *)userdata;
strncpy(buf, info->ssl_private_key_password, size);
buf[size - 1] = '\0';
return strlen(buf);
}
#endif
#endif
void
lws_ssl_bind_passphrase(SSL_CTX *ssl_ctx, struct lws_context_creation_info *info)
{
if (!info->ssl_private_key_password)
return;
#if defined(LWS_USE_POLARSSL)
#else
#if defined(LWS_USE_MBEDTLS)
#else
/*
* password provided, set ssl callback and user data
* for checking password which will be trigered during
* SSL_CTX_use_PrivateKey_file function
*/
SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, (void *)info);
SSL_CTX_set_default_passwd_cb(ssl_ctx, lws_context_init_ssl_pem_passwd_cb);
#endif
#endif
}
int
lws_context_init_ssl_library(struct lws_context_creation_info *info)
{
#ifdef USE_WOLFSSL
#ifdef USE_OLD_CYASSL
lwsl_notice(" Compiled with CyaSSL support\n");
#else
lwsl_notice(" Compiled with wolfSSL support\n");
#endif
#else
#if defined(LWS_USE_POLARSSL)
lwsl_notice(" Compiled with PolarSSL support\n");
#else
#if defined(LWS_USE_MBEDTLS)
lwsl_notice(" Compiled with mbedTLS support\n");
#else
lwsl_notice(" Compiled with OpenSSL support\n");
#endif
#endif
#endif
if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT)) {
lwsl_notice(" SSL disabled: no LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT\n");
return 0;
}
/* basic openssl init */
#if defined(LWS_USE_POLARSSL)
#else
#if defined(LWS_USE_MBEDTLS)
#else
SSL_library_init();
OpenSSL_add_all_algorithms();
SSL_load_error_strings();
openssl_websocket_private_data_index =
SSL_get_ex_new_index(0, "lws", NULL, NULL, NULL);
openssl_SSL_CTX_private_data_index = SSL_CTX_get_ex_new_index(0,
NULL, NULL, NULL, NULL);
#endif
#endif
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 defined(LWS_USE_POLARSSL)
#else
#if defined(LWS_USE_MBEDTLS)
#else
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 (OPENSSL_VERSION_NUMBER < 0x10100006L)
#if (OPENSSL_VERSION_NUMBER < 0x01000000) || defined(USE_WOLFSSL)
ERR_remove_state(0);
#else
#if (OPENSSL_VERSION_NUMBER >= 0x10100005L) && \
!defined(LIBRESSL_VERSION_NUMBER) && \
!defined(OPENSSL_IS_BORINGSSL)
ERR_remove_thread_state();
#else
ERR_remove_thread_state(NULL);
#endif
#endif
ERR_free_strings();
EVP_cleanup();
CRYPTO_cleanup_all_ex_data();
#endif
#endif
#endif
}
LWS_VISIBLE void
lws_decode_ssl_error(void)
{
#if defined(LWS_USE_POLARSSL)
#else
#if defined(LWS_USE_MBEDTLS)
#else
char buf[256];
u_long err;
while ((err = ERR_get_error()) != 0) {
ERR_error_string_n(err, buf, sizeof(buf));
lwsl_err("*** %lu %s\n", err, buf);
}
#endif
#endif
}
LWS_VISIBLE void
lws_ssl_remove_wsi_from_buffered_list(struct lws *wsi)
{
struct lws_context *context = wsi->context;
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
if (!wsi->pending_read_list_prev &&
!wsi->pending_read_list_next &&
pt->pending_read_list != wsi)
/* we are not on the list */
return;
/* point previous guy's next to our next */
if (!wsi->pending_read_list_prev)
pt->pending_read_list = wsi->pending_read_list_next;
else
wsi->pending_read_list_prev->pending_read_list_next =
wsi->pending_read_list_next;
/* point next guy's previous to our previous */
if (wsi->pending_read_list_next)
wsi->pending_read_list_next->pending_read_list_prev =
wsi->pending_read_list_prev;
wsi->pending_read_list_prev = NULL;
wsi->pending_read_list_next = NULL;
}
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;
if (!wsi->ssl)
return lws_ssl_capable_read_no_ssl(wsi, buf, len);
#if defined(LWS_USE_POLARSSL)
#else
#if defined(LWS_USE_MBEDTLS)
#else
n = SSL_read(wsi->ssl, buf, len);
#endif
#endif
/* manpage: returning 0 means connection shut down */
if (!n)
return LWS_SSL_CAPABLE_ERROR;
if (n < 0) {
n = lws_ssl_get_error(wsi, n);
if (n == SSL_ERROR_WANT_READ || n == SSL_ERROR_WANT_WRITE)
return LWS_SSL_CAPABLE_MORE_SERVICE;
return LWS_SSL_CAPABLE_ERROR;
}
if (wsi->vhost)
wsi->vhost->rx += n;
/*
* 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 defined(LWS_USE_POLARSSL)
if (ssl_get_bytes_avail(wsi->ssl) <= 0)
goto bail;
#else
#if defined(LWS_USE_MBEDTLS)
#else
if (!SSL_pending(wsi->ssl))
goto bail;
#endif
#endif
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;
#if defined(LWS_USE_POLARSSL)
return ssl_get_bytes_avail(wsi->ssl) > 0;
#else
#if defined(LWS_USE_MBEDTLS)
return ssl_get_bytes_avail(wsi->ssl) > 0;;
#else
return SSL_pending(wsi->ssl);
#endif
#endif
}
LWS_VISIBLE int
lws_ssl_capable_write(struct lws *wsi, unsigned char *buf, int len)
{
int n;
if (!wsi->ssl)
return lws_ssl_capable_write_no_ssl(wsi, buf, len);
#if defined(LWS_USE_POLARSSL)
n = ssl_write(wsi->ssl, buf, len);
#else
#if defined(LWS_USE_MBEDTLS)
#else
n = SSL_write(wsi->ssl, buf, len);
#endif
#endif
if (n > 0)
return n;
n = lws_ssl_get_error(wsi, n);
if (n == SSL_ERROR_WANT_READ || n == SSL_ERROR_WANT_WRITE) {
if (n == SSL_ERROR_WANT_WRITE)
lws_set_blocking_send(wsi);
return LWS_SSL_CAPABLE_MORE_SERVICE;
}
return LWS_SSL_CAPABLE_ERROR;
}
LWS_VISIBLE int
lws_ssl_close(struct lws *wsi)
{
int n;
if (!wsi->ssl)
return 0; /* not handled */
#if defined(LWS_USE_POLARSSL)
ssl_close_notify(wsi->ssl);
(void)n; /* we need to close the fd? */
ssl_free(wsi->ssl);
#else
#if defined(LWS_USE_MBEDTLS)
#else
n = SSL_get_fd(wsi->ssl);
SSL_shutdown(wsi->ssl);
compatible_close(n);
SSL_free(wsi->ssl);
#endif
#endif
wsi->ssl = NULL;
return 1; /* handled */
}
/* leave all wsi close processing to the caller */
LWS_VISIBLE int
lws_server_socket_service_ssl(struct lws *wsi, lws_sockfd_type accept_fd)
{
struct lws_context *context = wsi->context;
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
int n, m;
#if !defined(USE_WOLFSSL) && !defined(LWS_USE_POLARSSL) && !defined(LWS_USE_MBEDTLS)
BIO *bio;
#endif
if (!LWS_SSL_ENABLED(wsi->vhost))
return 0;
switch (wsi->mode) {
case LWSCM_SSL_INIT:
if (wsi->ssl)
lwsl_err("%s: leaking ssl\n", __func__);
if (accept_fd == LWS_SOCK_INVALID)
assert(0);
#if defined(LWS_USE_POLARSSL)
{
ssl_session *ssn;
int rc;
wsi->ssl = lws_zalloc(sizeof(ssl_context));
ssn = lws_zalloc(sizeof(ssl_session));
rc = ssl_init(wsi->ssl);
if (rc) {
lwsl_err("ssl_init failed\n");
goto fail;
}
ssl_set_endpoint(wsi->ssl, SSL_IS_SERVER);
ssl_set_authmode(wsi->ssl, SSL_VERIFY_OPTIONAL);
ssl_set_rng(wsi->ssl, urandom_bytes, NULL);
ssl_set_dbg(wsi->ssl, pssl_debug, NULL);
ssl_set_bio(wsi->ssl, net_recv, &wsi->sock, net_send, &wsi->sock);
ssl_set_ciphersuites(wsi->ssl, ciphers);
ssl_set_session(wsi->ssl, ssn);
ssl_set_ca_chain(wsi->ssl, &wsi->vhost->ssl_ctx->ca,
NULL, NULL);
ssl_set_own_cert_rsa(wsi->ssl,
&wsi->vhost->ssl_ctx->certificate,
&wsi->vhost->ssl_ctx->key);
// ssl_set_dh_param(wsi->ssl, my_dhm_P, my_dhm_G);
lwsl_err("%s: polarssl init done\n", __func__);
}
#else
#if defined(LWS_USE_MBEDTLS)
#else
wsi->ssl = SSL_new(wsi->vhost->ssl_ctx);
if (wsi->ssl == NULL) {
lwsl_err("SSL_new failed: %s\n",
ERR_error_string(lws_ssl_get_error(wsi, 0), NULL));
lws_decode_ssl_error();
if (accept_fd != LWS_SOCK_INVALID)
compatible_close(accept_fd);
goto fail;
}
SSL_set_ex_data(wsi->ssl,
openssl_websocket_private_data_index, wsi->vhost);
SSL_set_fd(wsi->ssl, accept_fd);
#endif
#endif
#ifdef USE_WOLFSSL
#ifdef USE_OLD_CYASSL
CyaSSL_set_using_nonblock(wsi->ssl, 1);
#else
wolfSSL_set_using_nonblock(wsi->ssl, 1);
#endif
#else
#if defined(LWS_USE_POLARSSL)
#else
#if defined(LWS_USE_MBEDTLS)
#else
SSL_set_mode(wsi->ssl, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
bio = SSL_get_rbio(wsi->ssl);
if (bio)
BIO_set_nbio(bio, 1); /* nonblocking */
else
lwsl_notice("NULL rbio\n");
bio = SSL_get_wbio(wsi->ssl);
if (bio)
BIO_set_nbio(bio, 1); /* nonblocking */
else
lwsl_notice("NULL rbio\n");
#endif
#endif
#endif
/*
* we are not accepted yet, but we need to enter ourselves
* as a live connection. That way we can retry when more
* pieces come if we're not sorted yet
*/
wsi->mode = LWSCM_SSL_ACK_PENDING;
if (insert_wsi_socket_into_fds(context, wsi)) {
lwsl_err("%s: failed to insert into fds\n", __func__);
goto fail;
}
lws_set_timeout(wsi, PENDING_TIMEOUT_SSL_ACCEPT,
context->timeout_secs);
lwsl_info("inserted SSL accept into fds, trying SSL_accept\n");
/* fallthru */
case LWSCM_SSL_ACK_PENDING:
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_err("%s: lws_change_pollfd failed\n", __func__);
goto fail;
}
lws_latency_pre(context, wsi);
n = recv(wsi->sock, (char *)pt->serv_buf, LWS_MAX_SOCKET_IO_BUF,
MSG_PEEK);
/*
* optionally allow non-SSL connect on SSL listening socket
* This is disabled by default, if enabled it goes around any
* SSL-level access control (eg, client-side certs) so leave
* it disabled unless you know it's not a problem for you
*/
if (wsi->vhost->allow_non_ssl_on_ssl_port) {
if (n >= 1 && pt->serv_buf[0] >= ' ') {
/*
* TLS content-type for Handshake is 0x16, and
* for ChangeCipherSpec Record, it's 0x14
*
* A non-ssl session will start with the HTTP
* method in ASCII. If we see it's not a legit
* SSL handshake kill the SSL for this
* connection and try to handle as a HTTP
* connection upgrade directly.
*/
wsi->use_ssl = 0;
#if defined(LWS_USE_POLARSSL)
ssl_close_notify(wsi->ssl);
ssl_free(wsi->ssl);
#else
#if defined(LWS_USE_MBEDTLS)
#else
SSL_shutdown(wsi->ssl);
SSL_free(wsi->ssl);
#endif
#endif
wsi->ssl = NULL;
if (lws_check_opt(context->options,
LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS))
wsi->redirect_to_https = 1;
goto accepted;
}
if (!n) /*
* connection is gone, or nothing to read
* if it's gone, we will timeout on
* PENDING_TIMEOUT_SSL_ACCEPT
*/
break;
if (n < 0 && (LWS_ERRNO == LWS_EAGAIN ||
LWS_ERRNO == LWS_EWOULDBLOCK)) {
/*
* well, we get no way to know ssl or not
* so go around again waiting for something
* to come and give us a hint, or timeout the
* connection.
*/
m = SSL_ERROR_WANT_READ;
goto go_again;
}
}
/* normal SSL connection processing path */
#if defined(LWS_USE_POLARSSL)
n = ssl_handshake(wsi->ssl);
#else
#if defined(LWS_USE_MBEDTLS)
#else
n = SSL_accept(wsi->ssl);
#endif
#endif
lws_latency(context, wsi,
"SSL_accept LWSCM_SSL_ACK_PENDING\n", n, n == 1);
if (n == 1)
goto accepted;
m = lws_ssl_get_error(wsi, n);
lwsl_debug("SSL_accept failed %d / %s\n",
m, ERR_error_string(m, NULL));
go_again:
if (m == SSL_ERROR_WANT_READ) {
if (lws_change_pollfd(wsi, 0, LWS_POLLIN)) {
lwsl_err("%s: WANT_READ change_pollfd failed\n", __func__);
goto fail;
}
lwsl_info("SSL_ERROR_WANT_READ\n");
break;
}
if (m == SSL_ERROR_WANT_WRITE) {
if (lws_change_pollfd(wsi, 0, LWS_POLLOUT)) {
lwsl_err("%s: WANT_WRITE change_pollfd failed\n", __func__);
goto fail;
}
break;
}
lwsl_err("SSL_accept failed skt %u: %s\n",
wsi->sock, ERR_error_string(m, NULL));
lws_ssl_elaborate_error();
goto fail;
accepted:
/* OK, we are accepted... give him some time to negotiate */
lws_set_timeout(wsi, PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
context->timeout_secs);
wsi->mode = LWSCM_HTTP_SERVING;
lws_http2_configure_if_upgraded(wsi);
lwsl_debug("accepted new SSL conn\n");
break;
}
return 0;
fail:
return 1;
}
void
lws_ssl_SSL_CTX_destroy(struct lws_vhost *vhost)
{
if (vhost->ssl_ctx) {
#if defined(LWS_USE_POLARSSL)
lws_free(vhost->ssl_ctx);
#else
#if defined(LWS_USE_MBEDTLS)
#else
SSL_CTX_free(vhost->ssl_ctx);
#endif
#endif
}
if (!vhost->user_supplied_ssl_ctx && vhost->ssl_client_ctx) {
#if defined(LWS_USE_POLARSSL)
lws_free(vhost->ssl_client_ctx);
#else
#if defined(LWS_USE_MBEDTLS)
#else
SSL_CTX_free(vhost->ssl_client_ctx);
#endif
#endif
}
}
void
lws_ssl_context_destroy(struct lws_context *context)
{
#if defined(LWS_USE_POLARSSL)
#else
#if defined(LWS_USE_MBEDTLS)
#else
#if (OPENSSL_VERSION_NUMBER < 0x10100006L)
#if (OPENSSL_VERSION_NUMBER < 0x01000000) || defined(USE_WOLFSSL)
ERR_remove_state(0);
#else
#if (OPENSSL_VERSION_NUMBER >= 0x10100005L) && \
!defined(LIBRESSL_VERSION_NUMBER) && \
!defined(OPENSSL_IS_BORINGSSL)
ERR_remove_thread_state();
#else
ERR_remove_thread_state(NULL);
#endif
#endif
ERR_free_strings();
EVP_cleanup();
CRYPTO_cleanup_all_ex_data();
#endif
#endif
#endif
}
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