Smoothing the update for origin check (#4216)

extra/reset-password.js

@@ -78,7 +78,6 @@ function disconnectAllSocketClients(username, password) {
 
         // Disconnect all socket connections
         const socket = io(localWebSocketURL, {
-            transports: [ "websocket" ],
             reconnection: false,
             timeout: 5000,
         });

server/server.js

@@ -54,7 +54,10 @@ if (!process.env.UPTIME_KUMA_WS_ORIGIN_CHECK) {
 
 log.info("server", "Node Env: " + process.env.NODE_ENV);
 log.info("server", "Inside Container: " + (process.env.UPTIME_KUMA_IS_CONTAINER === "1"));
-log.info("server", "WebSocket Origin Check: " + process.env.UPTIME_KUMA_WS_ORIGIN_CHECK);
+
+if (process.env.UPTIME_KUMA_WS_ORIGIN_CHECK === "bypass") {
+    log.warn("server", "WebSocket Origin Check: " + process.env.UPTIME_KUMA_WS_ORIGIN_CHECK);
+}
 
 log.info("server", "Importing Node libraries");
 const fs = require("fs");

server/uptime-kuma-server.js

@@ -99,39 +99,63 @@ class UptimeKumaServer {
         UptimeKumaServer.monitorTypeList["real-browser"] = new RealBrowserMonitorType();
         UptimeKumaServer.monitorTypeList["tailscale-ping"] = new TailscalePing();
 
+        // Allow all CORS origins (polling) in development
+        let cors = undefined;
+        if (isDev) {
+            cors = {
+                origin: "*",
+            };
+        }
+
         this.io = new Server(this.httpServer, {
-            allowRequest: (req, callback) => {
+            cors,
-                let isOriginValid = true;
+            allowRequest: async (req, callback) => {
-                const bypass = isDev || process.env.UPTIME_KUMA_WS_ORIGIN_CHECK === "bypass";
+                let transport;
+                // It should be always true, but just in case, because this property is not documented
+                if (req._query) {
+                    transport = req._query.transport;
+                } else {
+                    log.error("socket", "Ops!!! Cannot get transport type, assume that it is polling");
+                    transport = "polling";
+                }
 
-                if (!bypass) {
+                const clientIP = await this.getClientIPwithProxy(req.connection.remoteAddress, req.headers);
-                    let host = req.headers.host;
+                log.info("socket", `New ${transport} connection, IP = ${clientIP}`);
 
-                    // If this is set, it means the request is from the browser
+                // The following check is only for websocket connections, polling connections are already protected by CORS
-                    let origin = req.headers.origin;
+                if (transport === "polling") {
-
+                    callback(null, true);
-                    // If this is from the browser, check if the origin is allowed
+                } else if (transport === "websocket") {
-                    if (origin) {
+                    const bypass = process.env.UPTIME_KUMA_WS_ORIGIN_CHECK === "bypass";
+                    if (bypass) {
+                        log.info("auth", "WebSocket origin check is bypassed");
+                        callback(null, true);
+                    } else if (!req.headers.origin) {
+                        log.info("auth", "WebSocket with no origin is allowed");
+                        callback(null, true);
+                    } else {
                         try {
+                            let host = req.headers.host;
+                            let origin = req.headers.origin;
                             let originURL = new URL(origin);
+                            let xForwardedFor;
+                            if (await Settings.get("trustProxy")) {
+                                xForwardedFor = req.headers["x-forwarded-for"];
+                            }
 
-                            if (host !== originURL.host) {
+                            if (host !== originURL.host && xForwardedFor !== originURL.host) {
-                                isOriginValid = false;
+                                callback(null, false);
-                                log.error("auth", `Origin (${origin}) does not match host (${host}), IP: ${req.socket.remoteAddress}`);
+                                log.error("auth", `Origin (${origin}) does not match host (${host}), IP: ${clientIP}`);
+                            } else {
+                                callback(null, true);
                             }
                         } catch (e) {
                             // Invalid origin url, probably not from browser
-                            isOriginValid = false;
+                            callback(null, false);
-                            log.error("auth", `Invalid origin url (${origin}), IP: ${req.socket.remoteAddress}`);
+                            log.error("auth", `Invalid origin url (${origin}), IP: ${clientIP}`);
                         }
-                    } else {
-                        log.info("auth", `Origin is not set, IP: ${req.socket.remoteAddress}`);
                     }
-                } else {
-                    log.debug("auth", "Origin check is bypassed");
                 }
-
-                callback(null, isOriginValid);
             }
         });
     }
@@ -268,20 +292,28 @@ class UptimeKumaServer {
     /**
      * Get the IP of the client connected to the socket
      * @param {Socket} socket
-     * @returns {string}
+     * @returns {Promise<string>}
      */
-    async getClientIP(socket) {
+    getClientIP(socket) {
-        let clientIP = socket.client.conn.remoteAddress;
+        return this.getClientIPwithProxy(socket.client.conn.remoteAddress, socket.client.conn.request.headers);
+    }
 
+    /**
+     *
+     * @param {string} clientIP
+     * @param {IncomingHttpHeaders} headers
+     * @returns {Promise<string>}
+     */
+    async getClientIPwithProxy(clientIP, headers) {
         if (clientIP === undefined) {
             clientIP = "";
         }
 
         if (await Settings.get("trustProxy")) {
-            const forwardedFor = socket.client.conn.request.headers["x-forwarded-for"];
+            const forwardedFor = headers["x-forwarded-for"];
 
             return (typeof forwardedFor === "string" ? forwardedFor.split(",")[0].trim() : null)
-                || socket.client.conn.request.headers["x-real-ip"]
+                || headers["x-real-ip"]
                 || clientIP.replace(/^::ffff:/, "");
         } else {
             return clientIP.replace(/^::ffff:/, "");

src/mixins/socket.js

@@ -91,21 +91,20 @@ export default {
 
             this.socket.initedSocketIO = true;
 
-            let protocol = (location.protocol === "https:") ? "wss://" : "ws://";
+            let protocol = location.protocol + "//";
 
-            let wsHost;
+            let url;
             const env = process.env.NODE_ENV || "production";
             if (env === "development" && isDevContainer()) {
-                wsHost = protocol + getDevContainerServerHostname();
+                url = protocol + getDevContainerServerHostname();
             } else if (env === "development" || localStorage.dev === "dev") {
-                wsHost = protocol + location.hostname + ":3001";
+                url = protocol + location.hostname + ":3001";
             } else {
-                wsHost = protocol + location.host;
+                // Connect to the current url
+                url = undefined;
             }
 
-            socket = io(wsHost, {
+            socket = io(url);
-                transports: [ "websocket" ],
-            });
 
             socket.on("info", (info) => {
                 this.info = info;