478 lines
13 KiB
C
478 lines
13 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010-2017 Andy Green <andy@warmcat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation:
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include "private-libwebsockets.h"
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extern int openssl_websocket_private_data_index,
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openssl_SSL_CTX_private_data_index;
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extern void
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lws_ssl_bind_passphrase(SSL_CTX *ssl_ctx, struct lws_context_creation_info *info);
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#if !defined(LWS_WITH_MBEDTLS)
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static int
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OpenSSL_verify_callback(int preverify_ok, X509_STORE_CTX *x509_ctx)
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{
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SSL *ssl;
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int n;
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struct lws *wsi;
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ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
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SSL_get_ex_data_X509_STORE_CTX_idx());
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/*
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* !!! nasty openssl requires the index to come as a library-scope
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* static
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*/
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wsi = SSL_get_ex_data(ssl, openssl_websocket_private_data_index);
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n = wsi->vhost->protocols[0].callback(wsi,
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LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION,
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x509_ctx, ssl, preverify_ok);
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/* convert return code from 0 = OK to 1 = OK */
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return !n;
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}
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#endif
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static int
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lws_context_ssl_init_ecdh(struct lws_vhost *vhost)
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{
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#ifdef LWS_SSL_SERVER_WITH_ECDH_CERT
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EC_KEY *EC_key = NULL;
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EVP_PKEY *pkey;
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int KeyType;
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X509 *x;
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if (!lws_check_opt(vhost->context->options, LWS_SERVER_OPTION_SSL_ECDH))
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return 0;
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lwsl_notice(" Using ECDH certificate support\n");
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/* Get X509 certificate from ssl context */
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x = sk_X509_value(vhost->ssl_ctx->extra_certs, 0);
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if (!x) {
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lwsl_err("%s: x is NULL\n", __func__);
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return 1;
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}
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/* Get the public key from certificate */
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pkey = X509_get_pubkey(x);
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if (!pkey) {
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lwsl_err("%s: pkey is NULL\n", __func__);
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return 1;
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}
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/* Get the key type */
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KeyType = EVP_PKEY_type(pkey->type);
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if (EVP_PKEY_EC != KeyType) {
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lwsl_notice("Key type is not EC\n");
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return 0;
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}
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/* Get the key */
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EC_key = EVP_PKEY_get1_EC_KEY(pkey);
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/* Set ECDH parameter */
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if (!EC_key) {
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lwsl_err("%s: ECDH key is NULL \n", __func__);
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return 1;
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}
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SSL_CTX_set_tmp_ecdh(vhost->ssl_ctx, EC_key);
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EC_KEY_free(EC_key);
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#endif
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return 0;
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}
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static int
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lws_context_ssl_init_ecdh_curve(struct lws_context_creation_info *info,
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struct lws_vhost *vhost)
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{
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#if defined(LWS_HAVE_OPENSSL_ECDH_H) && !defined(LWS_WITH_MBEDTLS)
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EC_KEY *ecdh;
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int ecdh_nid;
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const char *ecdh_curve = "prime256v1";
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if (info->ecdh_curve)
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ecdh_curve = info->ecdh_curve;
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ecdh_nid = OBJ_sn2nid(ecdh_curve);
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if (NID_undef == ecdh_nid) {
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lwsl_err("SSL: Unknown curve name '%s'", ecdh_curve);
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return 1;
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}
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ecdh = EC_KEY_new_by_curve_name(ecdh_nid);
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if (NULL == ecdh) {
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lwsl_err("SSL: Unable to create curve '%s'", ecdh_curve);
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return 1;
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}
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SSL_CTX_set_tmp_ecdh(vhost->ssl_ctx, ecdh);
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EC_KEY_free(ecdh);
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SSL_CTX_set_options(vhost->ssl_ctx, SSL_OP_SINGLE_ECDH_USE);
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lwsl_notice(" SSL ECDH curve '%s'\n", ecdh_curve);
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#else
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#if !defined(LWS_WITH_MBEDTLS)
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lwsl_notice(" OpenSSL doesn't support ECDH\n");
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#endif
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#endif
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return 0;
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}
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#if !defined(LWS_WITH_MBEDTLS) && defined(SSL_TLSEXT_ERR_NOACK) && !defined(OPENSSL_NO_TLSEXT)
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static int
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lws_ssl_server_name_cb(SSL *ssl, int *ad, void *arg)
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{
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struct lws_context *context = (struct lws_context *)arg;
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struct lws_vhost *vhost, *vh;
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const char *servername;
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if (!ssl)
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return SSL_TLSEXT_ERR_NOACK;
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/*
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* We can only get ssl accepted connections by using a vhost's ssl_ctx
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* find out which listening one took us and only match vhosts on the
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* same port.
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*/
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vh = context->vhost_list;
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while (vh) {
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if (!vh->being_destroyed && ssl && vh->ssl_ctx == SSL_get_SSL_CTX(ssl))
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break;
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vh = vh->vhost_next;
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}
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if (!vh) {
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assert(vh); /* can't match the incoming vh? */
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return SSL_TLSEXT_ERR_OK;
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}
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servername = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
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if (!servername) {
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/* the client doesn't know what hostname it wants */
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lwsl_info("SNI: Unknown ServerName: %s\n", servername);
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return SSL_TLSEXT_ERR_OK;
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}
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vhost = lws_select_vhost(context, vh->listen_port, servername);
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if (!vhost) {
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lwsl_info("SNI: none: %s:%d\n", servername, vh->listen_port);
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return SSL_TLSEXT_ERR_OK;
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}
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lwsl_info("SNI: Found: %s:%d\n", servername, vh->listen_port);
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/* select the ssl ctx from the selected vhost for this conn */
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SSL_set_SSL_CTX(ssl, vhost->ssl_ctx);
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return SSL_TLSEXT_ERR_OK;
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}
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#endif
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LWS_VISIBLE int
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lws_context_init_server_ssl(struct lws_context_creation_info *info,
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struct lws_vhost *vhost)
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{
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struct lws_context *context = vhost->context;
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struct lws wsi;
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unsigned long error;
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int n;
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if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT)) {
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vhost->use_ssl = 0;
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return 0;
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}
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/*
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* If he is giving a cert filepath, take it as a sign he wants to use
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* it on this vhost. User code can leave the cert filepath NULL and
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* set the LWS_SERVER_OPTION_CREATE_VHOST_SSL_CTX option itself, in
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* which case he's expected to set up the cert himself at
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* LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS, which
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* provides the vhost SSL_CTX * in the user parameter.
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*/
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if (info->ssl_cert_filepath)
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info->options |= LWS_SERVER_OPTION_CREATE_VHOST_SSL_CTX;
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if (info->port != CONTEXT_PORT_NO_LISTEN) {
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vhost->use_ssl = lws_check_opt(info->options,
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LWS_SERVER_OPTION_CREATE_VHOST_SSL_CTX);
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if (vhost->use_ssl && info->ssl_cipher_list)
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lwsl_notice(" SSL ciphers: '%s'\n", info->ssl_cipher_list);
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if (vhost->use_ssl)
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lwsl_notice(" Using SSL mode\n");
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else
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lwsl_notice(" Using non-SSL mode\n");
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}
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/*
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* give him a fake wsi with context + vhost set, so he can use
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* lws_get_context() in the callback
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*/
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memset(&wsi, 0, sizeof(wsi));
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wsi.vhost = vhost;
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wsi.context = context;
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(void)n;
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(void)error;
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/*
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* Firefox insists on SSLv23 not SSLv3
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* Konq disables SSLv2 by default now, SSLv23 works
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*
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* SSLv23_server_method() is the openssl method for "allow all TLS
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* versions", compared to e.g. TLSv1_2_server_method() which only allows
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* tlsv1.2. Unwanted versions must be disabled using SSL_CTX_set_options()
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*/
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#if !defined(LWS_WITH_MBEDTLS)
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{
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SSL_METHOD *method;
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method = (SSL_METHOD *)SSLv23_server_method();
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if (!method) {
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error = ERR_get_error();
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lwsl_err("problem creating ssl method %lu: %s\n",
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error, ERR_error_string(error,
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(char *)context->pt[0].serv_buf));
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return 1;
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}
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vhost->ssl_ctx = SSL_CTX_new(method); /* create context */
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if (!vhost->ssl_ctx) {
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error = ERR_get_error();
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lwsl_err("problem creating ssl context %lu: %s\n",
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error, ERR_error_string(error,
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(char *)context->pt[0].serv_buf));
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return 1;
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}
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}
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#else
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{
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const SSL_METHOD *method = TLSv1_2_server_method();
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vhost->ssl_ctx = SSL_CTX_new(method); /* create context */
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if (!vhost->ssl_ctx) {
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lwsl_err("problem creating ssl context\n");
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return 1;
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}
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}
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#endif
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#if !defined(LWS_WITH_MBEDTLS)
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/* associate the lws context with the SSL_CTX */
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SSL_CTX_set_ex_data(vhost->ssl_ctx,
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openssl_SSL_CTX_private_data_index, (char *)vhost->context);
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/* Disable SSLv2 and SSLv3 */
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SSL_CTX_set_options(vhost->ssl_ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
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#ifdef SSL_OP_NO_COMPRESSION
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SSL_CTX_set_options(vhost->ssl_ctx, SSL_OP_NO_COMPRESSION);
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#endif
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SSL_CTX_set_options(vhost->ssl_ctx, SSL_OP_SINGLE_DH_USE);
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SSL_CTX_set_options(vhost->ssl_ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
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if (info->ssl_cipher_list)
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SSL_CTX_set_cipher_list(vhost->ssl_ctx,
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info->ssl_cipher_list);
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#endif
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/* as a server, are we requiring clients to identify themselves? */
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if (lws_check_opt(info->options,
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LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT)) {
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int verify_options = SSL_VERIFY_PEER;
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if (!lws_check_opt(info->options,
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LWS_SERVER_OPTION_PEER_CERT_NOT_REQUIRED))
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verify_options |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
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#if !defined(LWS_WITH_MBEDTLS)
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SSL_CTX_set_session_id_context(vhost->ssl_ctx,
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(unsigned char *)context, sizeof(void *));
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/* absolutely require the client cert */
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SSL_CTX_set_verify(vhost->ssl_ctx,
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verify_options, OpenSSL_verify_callback);
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#endif
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}
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#if !defined(LWS_WITH_MBEDTLS) && !defined(OPENSSL_NO_TLSEXT)
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SSL_CTX_set_tlsext_servername_callback(vhost->ssl_ctx,
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lws_ssl_server_name_cb);
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SSL_CTX_set_tlsext_servername_arg(vhost->ssl_ctx, context);
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#endif
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/*
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* give user code a chance to load certs into the server
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* allowing it to verify incoming client certs
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*/
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#if !defined(LWS_WITH_MBEDTLS)
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if (info->ssl_ca_filepath &&
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!SSL_CTX_load_verify_locations(vhost->ssl_ctx,
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info->ssl_ca_filepath, NULL)) {
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lwsl_err("%s: SSL_CTX_load_verify_locations unhappy\n", __func__);
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}
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#endif
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if (vhost->use_ssl) {
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if (lws_context_ssl_init_ecdh_curve(info, vhost))
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return -1;
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vhost->protocols[0].callback(&wsi,
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LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS,
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vhost->ssl_ctx, NULL, 0);
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}
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if (lws_check_opt(info->options, LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT))
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/* Normally SSL listener rejects non-ssl, optionally allow */
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vhost->allow_non_ssl_on_ssl_port = 1;
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if (info->ssl_options_set)
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SSL_CTX_set_options(vhost->ssl_ctx, info->ssl_options_set);
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/* SSL_clear_options introduced in 0.9.8m */
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#if !defined(LWS_WITH_MBEDTLS)
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#if (OPENSSL_VERSION_NUMBER >= 0x009080df) && !defined(USE_WOLFSSL)
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if (info->ssl_options_clear)
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SSL_CTX_clear_options(vhost->ssl_ctx, info->ssl_options_clear);
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#endif
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#endif
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lwsl_info(" SSL options 0x%lX\n", SSL_CTX_get_options(vhost->ssl_ctx));
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if (vhost->use_ssl && info->ssl_cert_filepath) {
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/*
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* The user code can choose to either pass the cert and
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* key filepaths using the info members like this, or it can
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* leave them NULL; force the vhost SSL_CTX init using the info
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* options flag LWS_SERVER_OPTION_CREATE_VHOST_SSL_CTX; and
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* set up the cert himself using the user callback
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* LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS, which
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* happened just above and has the vhost SSL_CTX * in the user
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* parameter.
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*/
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#if !defined(LWS_WITH_MBEDTLS)
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/* set the local certificate from CertFile */
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n = SSL_CTX_use_certificate_chain_file(vhost->ssl_ctx,
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info->ssl_cert_filepath);
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if (n != 1) {
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error = ERR_get_error();
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lwsl_err("problem getting cert '%s' %lu: %s\n",
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info->ssl_cert_filepath,
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error,
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ERR_error_string(error,
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(char *)context->pt[0].serv_buf));
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return 1;
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}
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lws_ssl_bind_passphrase(vhost->ssl_ctx, info);
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#else
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uint8_t *p;
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lws_filepos_t flen;
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int err;
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if (alloc_pem_to_der_file(vhost->context, info->ssl_cert_filepath, &p,
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&flen)) {
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lwsl_err("couldn't find cert file %s\n",
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info->ssl_cert_filepath);
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return 1;
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}
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err = SSL_CTX_use_certificate_ASN1(vhost->ssl_ctx, flen, p);
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if (!err) {
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lwsl_err("Problem loading cert\n");
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return 1;
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}
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#if !defined(LWS_WITH_ESP32)
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free(p);
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p = NULL;
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#endif
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if (info->ssl_private_key_filepath) {
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if (alloc_pem_to_der_file(vhost->context,
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info->ssl_private_key_filepath, &p, &flen)) {
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lwsl_err("couldn't find cert file %s\n",
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info->ssl_cert_filepath);
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return 1;
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}
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err = SSL_CTX_use_PrivateKey_ASN1(0, vhost->ssl_ctx, p, flen);
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if (!err) {
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lwsl_err("Problem loading key\n");
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return 1;
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}
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}
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#if !defined(LWS_WITH_ESP32)
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free(p);
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p = NULL;
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#endif
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#endif
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if (info->ssl_private_key_filepath != NULL) {
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#if !defined(LWS_WITH_MBEDTLS)
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/* set the private key from KeyFile */
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if (SSL_CTX_use_PrivateKey_file(vhost->ssl_ctx,
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info->ssl_private_key_filepath,
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SSL_FILETYPE_PEM) != 1) {
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error = ERR_get_error();
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lwsl_err("ssl problem getting key '%s' %lu: %s\n",
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info->ssl_private_key_filepath, error,
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ERR_error_string(error,
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(char *)context->pt[0].serv_buf));
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return 1;
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}
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#endif
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} else
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if (vhost->protocols[0].callback(&wsi,
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LWS_CALLBACK_OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY,
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vhost->ssl_ctx, NULL, 0)) {
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lwsl_err("ssl private key not set\n");
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return 1;
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}
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#if !defined(LWS_WITH_MBEDTLS)
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/* verify private key */
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if (!SSL_CTX_check_private_key(vhost->ssl_ctx)) {
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lwsl_err("Private SSL key doesn't match cert\n");
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return 1;
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}
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#endif
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}
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if (vhost->use_ssl) {
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if (lws_context_ssl_init_ecdh(vhost))
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return 1;
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/*
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* SSL is happy and has a cert it's content with
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* If we're supporting HTTP2, initialize that
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*/
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lws_context_init_http2_ssl(vhost);
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}
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return 0;
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}
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