c++ - 带有 openSSL 的 libwebsocket 服务器不接受连接

Question

我在(libwebsocket 库)的帮助下编写了 web 套接字服务器，它接受非 SSL 的 web 套接字客户端连接。 现在我希望它接受 SSL 连接，所以我生成了自签名证书和 key ，在创建 Web 套接字上下文时，我还提供了 key 和证书路径以及选项 LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT。 但是在使用 wss://ip:7681 建立 https 连接时，我收到了连接请求回调，即 LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED，之后是 LWS_CALLBACK_WSI_DESTROY，在浏览器中收到关于无法连接的控制台错误。

  Firefox can’t establish a connection to the server at wss://192.168.4.254:7681/.    

请检查以下用于创建基于 openSSL 的 Web 套接字服务器的服务器端代码。

struct lws_protocols WebSocketCommon::protocols[ 2 ] = { {"wss", WebSocketCommon::callback, 0,    0 },{ NULL, NULL, 0, 0 } };

int callback ( struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len ) {
   switch ( reason ) {

    case LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED:
    {
         //code 
         break;      
    }
    case LWS_CALLBACK_WSI_DESTROY: 
    {
         //code 
         break;
    }  
    case LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS: {
        Log::d( m_r_logger, TAG, "LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS\n");
        SSL_CTX_load_verify_locations( (SSL_CTX*) user, NULL, getenv(SSL_CERT_FILE_PATH) );
        break;
    }
        default: {
            break;
    }
}

return lws_callback_http_dummy(wsi, reason, user, in, len);
} 

void createContext (bool useSSL) {
    struct lws_context_creation_info info;
    memset( &info, 0, sizeof(struct lws_context_creation_info) );

    info.port = 7681;
    info.uid = -1;
    info.gid = -1;
    info.protocols = protocols;
    info.mounts = &mount;

    info.extensions = exts;
    info.timeout_secs = 5;
    info.ip_limit_ah = 24; /* for testing */
    info.ip_limit_wsi = 400; /* for testing */

    // Following options for openSSL certificate
    if(useSSL){
        info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT | LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT | LWS_SERVER_OPTION_DISABLE_IPV6 | LWS_SERVER_OPTION_PEER_CERT_NOT_REQUIRED | LWS_SERVER_OPTION_IGNORE_MISSING_CERT;
        info.ssl_cert_filepath = SSL_CERT_FILE_PATH;
        info.ssl_private_key_filepath = SSL_PRIVATE_KEY_PATH;
    }
    fContext = lws_create_context( &info );

    }

我在创建网络套接字上下文和接受 wss 连接时收到了以下日志。

WebSocket.cpp:638...... :createContext ( ) - begin
WebSocket.cpp:640...... : createContext - fReferenceCount = 0
WebSocket.cpp:324...... : Creating Vhost 'default' port 7681, 1 protocols, IPv6 off
WebSocket.cpp:324...... :  Using SSL mode
WebSocket.cpp:324...... :  SSL ECDH curve 'prime256v1'
WebSocket.cpp:612...... : LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS
WebSocket.cpp:324...... : lws_tls_client_create_vhost_context: doing cert filepath /etc/nginx  /ssl/mycert.crt
WebSocket.cpp:324...... : Loaded client cert /etc/nginx/ssl/mycert.crt
WebSocket.cpp:324...... : lws_tls_client_create_vhost_context: doing private key filepath
WebSocket.cpp:324...... : Loaded client cert private key /etc/nginx/ssl/mykey.key
WebSocket.cpp:324...... : created client ssl context for default
WebSocket.cpp:684...... : lws_create_context SUCCEEDED
WebSocket.cpp:759...... : start  Starting Service Thread.
WebSocket.cpp:705...... : createContext - fReferenceCount = 1 
WebSocket.cpp:706...... : createContext - end

以下是我正在使用的库版本。

libwebsocket.so 13
OpenSSL 1.0.2o  27 Mar 2018

请告诉我出了什么问题？

Answer 1

这个问题可能与 libwebsockets 无关，而是与 Firefox 对允许连接到具有自签名证书的 WSS 很挑剔有关。尝试从其他程序连接到您的服务器，例如，一个简单的 python 程序。

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