release: v4.8.7 WebRTC join reliability patch

CHANGELOG.md

@@ -1,6 +1,25 @@
 # Changelog
 
-## v4.8.6 — Security hardening patch release
+## v4.8.7 — WebRTC manual join reliability patch
+
+This patch improves manual WebRTC setup across separate devices and restrictive local networks.
+
+### Fixed
+
+- Stabilized the manual offer/answer join flow so verification waits for real transport readiness.
+- Preserved generated response data during manual exchange instead of resetting the joiner screen prematurely.
+- Preserved pending creator-side offer context so responses can be applied after transient ICE failures without false session-salt hijacking errors.
+- Added operator ICE override support through `config/ice-servers.js`.
+- Added ExpressTURN TURN/STUN configuration for relay fallback in environments where mDNS host candidates cannot connect.
+- Added user-visible warning when a remote peer provides only mDNS host candidates and no `srflx` or `relay` route.
+- Added safer ICE diagnostics that report candidate classes without exposing full IP addresses or TURN credentials.
+
+### Verification
+
+- `npm test`
+- `npm run build`
+
+## v4.8.7 — Security hardening patch release
 
 This patch release strengthens SecureBit.chat across verification, sanitization, privacy, transport abuse resistance, cache safety, and repository hygiene.
 
@@ -29,7 +48,7 @@ This patch release strengthens SecureBit.chat across verification, sanitization,
 - Clean install succeeds with `npm ci`.
 - Production build succeeds with `npm run build`.
 
-## v4.8.5 — Security hardening release
+## v4.8.7 — Security hardening release
 
 This release consolidates several months of security, privacy, and lifecycle hardening work by the SecureBit.chat team.
 

README.md

@@ -1,4 +1,4 @@
-# SecureBit.chat v4.8.6
+# SecureBit.chat v4.8.7
 
 SecureBit.chat is a browser-based peer-to-peer chat application built on WebRTC and Web Crypto APIs. It is designed for direct encrypted communication, explicit peer verification, and a small operational footprint without account registration or server-side message storage.
 
@@ -15,7 +15,11 @@ SecureBit.chat uses:
 
 A session is not treated as verified until both peers complete the interactive SAS flow. Each user must compare the displayed code with the peer through an out-of-band channel and enter the matching code manually. Three failed SAS attempts terminate the session.
 
-## Highlights in v4.8.6
+## Highlights in v4.8.7
+
+- Manual WebRTC setup now preserves pending offer/answer state during slow out-of-band exchange.
+- TURN relay fallback can be configured through `config/ice-servers.js` for restrictive networks.
+- ICE diagnostics now identify mDNS-only candidate failures without exposing full peer IPs.
 
 This patch release strengthens the existing security model with a focused hardening pass:
 

config/ice-servers.js

@@ -0,0 +1,15 @@
+// SecureBit.chat operator ICE server override.
+// Loaded before the WebRTC manager is created. Credentials are visible to browsers;
+// rotate them from the ExpressTURN dashboard if this file is published publicly.
+window.SECUREBIT_ICE_SERVERS = [
+  { urls: 'stun:stun.cloudflare.com:3478' },
+  { urls: 'stun:stun.expressturn.com:3478' },
+  {
+    urls: [
+      'turn:free.expressturn.com:3478?transport=udp',
+      'turn:free.expressturn.com:3478?transport=tcp'
+    ],
+    username: '000000002094555952',
+    credential: 't1oK9Zftes9j7E7hJmsLad9jq1M='
+  }
+];

dist/app.js

@@ -1,3 +1,36 @@
+// src/utils/debugWindowHooks.js
+function isSecureBitDebugEnabled(targetWindow = globalThis.window) {
+  return targetWindow?.SECUREBIT_DEBUG === true;
+}
+function installDebugWindowHooks({
+  targetWindow = globalThis.window,
+  webrtcManagerRef,
+  onClearData,
+  clearConsole = () => {
+    if (typeof console.clear === "function") {
+      console.clear();
+    }
+  }
+}) {
+  if (!isSecureBitDebugEnabled(targetWindow)) {
+    return () => {
+    };
+  }
+  targetWindow.forceCleanup = () => {
+    onClearData();
+    if (webrtcManagerRef.current) {
+      webrtcManagerRef.current.disconnect();
+    }
+  };
+  targetWindow.clearLogs = clearConsole;
+  targetWindow.webrtcManagerRef = webrtcManagerRef;
+  return () => {
+    delete targetWindow.forceCleanup;
+    delete targetWindow.clearLogs;
+    delete targetWindow.webrtcManagerRef;
+  };
+}
+
 // src/app.jsx
 var EnhancedCopyButton = ({ text, className = "", children }) => {
   const [copied, setCopied] = React.useState(false);
@@ -322,9 +355,11 @@ var EnhancedConnectionSetup = ({
   markAnswerCreated,
   notificationIntegrationRef,
   isGeneratingKeys,
+  setIsGeneratingKeys,
   handleCreateOffer,
   relayOnlyMode,
-  setRelayOnlyMode
+  setRelayOnlyMode,
+  webrtcManagerRef
 }) => {
   const [mode, setMode] = React.useState("select");
   const [notificationPermissionRequested, setNotificationPermissionRequested] = React.useState(false);
@@ -714,6 +749,7 @@ var EnhancedConnectionSetup = ({
                   text: (() => {
                     try {
                       const min = typeof offerData === "object" ? JSON.stringify(offerData) : offerData || "";
+                      if (!min) return "";
                       if (typeof window.encodeBinaryToPrefixed === "function") {
                         return window.encodeBinaryToPrefixed(min);
                       }
@@ -1032,6 +1068,7 @@ var EnhancedConnectionSetup = ({
               text: (() => {
                 try {
                   const min = typeof answerData === "object" ? JSON.stringify(answerData) : answerData || "";
+                  if (!min) return "";
                   if (typeof window.encodeBinaryToPrefixed === "function") {
                     return window.encodeBinaryToPrefixed(min);
                   }
@@ -1449,7 +1486,7 @@ var EnhancedSecureP2PChat = () => {
   const [qrCodeUrl, setQrCodeUrl] = React.useState("");
   const [showQRScanner, setShowQRScanner] = React.useState(false);
   const [showQRScannerModal, setShowQRScannerModal] = React.useState(false);
-  const [isGeneratingKeys, setIsGeneratingKeys2] = React.useState(false);
+  const [isGeneratingKeys, setIsGeneratingKeys] = React.useState(false);
   const [isVerified, setIsVerified] = React.useState(false);
   const [securityLevel, setSecurityLevel] = React.useState(null);
   const [sessionTimeLeft, setSessionTimeLeft] = React.useState(0);
@@ -1474,12 +1511,9 @@ var EnhancedSecureP2PChat = () => {
     }));
   };
   const shouldPreserveAnswerData = () => {
-    const now = Date.now();
-    const answerAge = now - (connectionState.answerCreatedAt || 0);
-    const maxPreserveTime = 3e5;
-    const hasAnswerData = answerData && typeof answerData === "string" && answerData.trim().length > 0 || answerInput && answerInput.trim().length > 0;
-    const hasAnswerQR = qrCodeUrl && qrCodeUrl.trim().length > 0;
-    const shouldPreserve = connectionState.hasActiveAnswer && answerAge < maxPreserveTime && !connectionState.isUserInitiatedDisconnect || hasAnswerData && answerAge < maxPreserveTime && !connectionState.isUserInitiatedDisconnect || hasAnswerQR && answerAge < maxPreserveTime && !connectionState.isUserInitiatedDisconnect;
+    const hasAnswerData = !!answerData || answerInput && typeof answerInput === "string" && answerInput.trim().length > 0;
+    const hasAnswerQR = qrCodeUrl && typeof qrCodeUrl === "string" && qrCodeUrl.trim().length > 0;
+    const shouldPreserve = connectionState.hasActiveAnswer && !connectionState.isUserInitiatedDisconnect || hasAnswerData && !connectionState.isUserInitiatedDisconnect || hasAnswerQR && !connectionState.isUserInitiatedDisconnect;
     return shouldPreserve;
   };
   const markAnswerCreated = () => {
@@ -1488,26 +1522,15 @@ var EnhancedSecureP2PChat = () => {
       answerCreatedAt: Date.now()
     });
   };
-  React.useEffect(() => {
-    window.forceCleanup = () => {
-      handleClearData();
-      if (webrtcManagerRef2.current) {
-        webrtcManagerRef2.current.disconnect();
-      }
-    };
-    window.clearLogs = () => {
-      if (typeof console.clear === "function") {
-        console.clear();
-      }
-    };
-    return () => {
-      delete window.forceCleanup;
-      delete window.clearLogs;
-    };
-  }, []);
-  const webrtcManagerRef2 = React.useRef(null);
+  const webrtcManagerRef = React.useRef(null);
   const notificationIntegrationRef = React.useRef(null);
-  window.webrtcManagerRef = webrtcManagerRef2;
+  React.useEffect(() => {
+    return installDebugWindowHooks({
+      targetWindow: window,
+      webrtcManagerRef,
+      onClearData: handleClearData
+    });
+  }, []);
   const addMessageWithAutoScroll = React.useCallback((message, type) => {
     const newMessage = {
       message,
@@ -1548,7 +1571,7 @@ var EnhancedSecureP2PChat = () => {
     }
     window.isUpdatingSecurity = true;
     try {
-      if (webrtcManagerRef2.current) {
+      if (webrtcManagerRef.current) {
         setSecurityLevel({
           level: "MAXIMUM",
           score: 100,
@@ -1559,7 +1582,7 @@ var EnhancedSecureP2PChat = () => {
           isRealData: true
         });
         if (window.DEBUG_MODE) {
-          const currentLevel = webrtcManagerRef2.current.ecdhKeyPair && webrtcManagerRef2.current.ecdsaKeyPair ? await webrtcManagerRef2.current.calculateSecurityLevel() : {
+          const currentLevel = webrtcManagerRef.current.ecdhKeyPair && webrtcManagerRef.current.ecdsaKeyPair ? await webrtcManagerRef.current.calculateSecurityLevel() : {
             level: "MAXIMUM",
             score: 100,
             sessionType: "premium",
@@ -1589,8 +1612,8 @@ var EnhancedSecureP2PChat = () => {
       localStorage.setItem("securebit_relay_only_mode", String(relayOnlyMode));
     } catch {
     }
-    if (webrtcManagerRef2.current?._config?.webrtc) {
-      webrtcManagerRef2.current._config.webrtc.relayOnly = relayOnlyMode;
+    if (webrtcManagerRef.current?._config?.webrtc) {
+      webrtcManagerRef.current._setRelayOnlyMode(relayOnlyMode);
     }
   }, [relayOnlyMode]);
   React.useEffect(() => {
@@ -1601,7 +1624,7 @@ var EnhancedSecureP2PChat = () => {
     }
   }, [messages]);
   React.useEffect(() => {
-    if (webrtcManagerRef2.current) {
+    if (webrtcManagerRef.current) {
       console.log("\u26A0\uFE0F WebRTC Manager already initialized, skipping...");
       return;
     }
@@ -1763,7 +1786,7 @@ var EnhancedSecureP2PChat = () => {
     if (typeof console.clear === "function") {
       console.clear();
     }
-    webrtcManagerRef2.current = new EnhancedSecureWebRTCManager(
+    webrtcManagerRef.current = new EnhancedSecureWebRTCManager(
       handleMessage,
       handleStatusChange,
       handleKeyExchange,
@@ -1779,7 +1802,7 @@ var EnhancedSecureP2PChat = () => {
     );
     if (typeof Notification !== "undefined" && Notification && Notification.permission === "granted" && window.NotificationIntegration && !notificationIntegrationRef.current) {
       try {
-        const integration = new window.NotificationIntegration(webrtcManagerRef2.current);
+        const integration = new window.NotificationIntegration(webrtcManagerRef.current);
         integration.init().then(() => {
           notificationIntegrationRef.current = integration;
         }).catch((error) => {
@@ -1787,12 +1810,12 @@ var EnhancedSecureP2PChat = () => {
       } catch (error) {
       }
     }
-    handleMessage(" SecureBit.chat Enhanced Security Edition v4.8.5 - ECDH + DTLS + SAS initialized. Ready to establish a secure connection with ECDH key exchange, DTLS fingerprint verification, and SAS authentication to prevent MITM attacks.", "system");
+    handleMessage(" SecureBit.chat Enhanced Security Edition v4.8.7 - ECDH + DTLS + SAS initialized. Ready to establish a secure connection with ECDH key exchange, DTLS fingerprint verification, and SAS authentication to prevent MITM attacks.", "system");
     const handleBeforeUnload = (event) => {
       if (event.type === "beforeunload" && !isTabSwitching) {
-        if (webrtcManagerRef2.current && webrtcManagerRef2.current.isConnected()) {
+        if (webrtcManagerRef.current && webrtcManagerRef.current.isConnected()) {
           try {
-            webrtcManagerRef2.current.sendSystemMessage({
+            webrtcManagerRef.current.sendSystemMessage({
               type: "peer_disconnect",
               reason: "user_disconnect",
               timestamp: Date.now()
@@ -1800,12 +1823,12 @@ var EnhancedSecureP2PChat = () => {
           } catch (error) {
           }
           setTimeout(() => {
-            if (webrtcManagerRef2.current) {
-              webrtcManagerRef2.current.disconnect();
+            if (webrtcManagerRef.current) {
+              webrtcManagerRef.current.disconnect();
             }
           }, 100);
-        } else if (webrtcManagerRef2.current) {
-          webrtcManagerRef2.current.disconnect();
+        } else if (webrtcManagerRef.current) {
+          webrtcManagerRef.current.disconnect();
         }
       } else if (isTabSwitching) {
         event.preventDefault();
@@ -1833,8 +1856,8 @@ var EnhancedSecureP2PChat = () => {
       }
     };
     document.addEventListener("visibilitychange", handleVisibilityChange);
-    if (webrtcManagerRef2.current) {
-      webrtcManagerRef2.current.setFileTransferCallbacks(
+    if (webrtcManagerRef.current) {
+      webrtcManagerRef.current.setFileTransferCallbacks(
         // Progress callback
         (progress) => {
           console.log("File progress:", progress);
@@ -1886,9 +1909,9 @@ var EnhancedSecureP2PChat = () => {
         clearTimeout(tabSwitchTimeout);
         tabSwitchTimeout = null;
       }
-      if (webrtcManagerRef2.current) {
-        webrtcManagerRef2.current.disconnect();
-        webrtcManagerRef2.current = null;
+      if (webrtcManagerRef.current) {
+        webrtcManagerRef.current.disconnect();
+        webrtcManagerRef.current = null;
       }
     };
   }, []);
@@ -2553,12 +2576,12 @@ var EnhancedSecureP2PChat = () => {
   };
   const handleCreateOffer = async () => {
     try {
-      setIsGeneratingKeys2(true);
+      setIsGeneratingKeys(true);
       setOfferData("");
       setShowOfferStep(false);
       setShowQRCode(false);
       setQrCodeUrl("");
-      const offer = await webrtcManagerRef2.current.createSecureOffer();
+      const offer = await webrtcManagerRef.current.createSecureOffer();
       setOfferData(offer);
       setShowOfferStep(true);
       const offerString = typeof offer === "object" ? JSON.stringify(offer) : offer;
@@ -2643,7 +2666,7 @@ var EnhancedSecureP2PChat = () => {
         timestamp: Date.now()
       }]);
     } finally {
-      setIsGeneratingKeys2(false);
+      setIsGeneratingKeys(false);
     }
   };
   const handleCreateAnswer = async () => {
@@ -2683,7 +2706,7 @@ var EnhancedSecureP2PChat = () => {
         if (!isValidOfferType) {
           throw new Error("Invalid invitation type. Expected offer or enhanced_secure_offer");
         }
-        const answer = await webrtcManagerRef2.current.createSecureAnswer(offer);
+        const answer = await webrtcManagerRef.current.createSecureAnswer(offer);
         setAnswerData(answer);
         setShowAnswerStep(true);
         const answerString = typeof answer === "object" ? JSON.stringify(answer) : answer;
@@ -2740,10 +2763,8 @@ var EnhancedSecureP2PChat = () => {
         } catch (e) {
           console.warn("Answer QR generation failed:", e);
         }
-        if (answerInput.trim().length > 0) {
-          if (typeof markAnswerCreated === "function") {
-            markAnswerCreated();
-          }
+        if (typeof markAnswerCreated === "function") {
+          markAnswerCreated();
         }
         const existingResponseMessages = messages.filter(
           (m) => m.type === "system" && (m.message.includes("Secure response created") || m.message.includes("Send the response"))
@@ -2821,7 +2842,7 @@ var EnhancedSecureP2PChat = () => {
         if (!answerType || answerType !== "answer" && answerType !== "enhanced_secure_answer") {
           throw new Error("Invalid response type. Expected answer or enhanced_secure_answer");
         }
-        await webrtcManagerRef2.current.handleSecureAnswer(answer);
+        await webrtcManagerRef.current.handleSecureAnswer(answer);
         if (pendingSession) {
           setPendingSession(null);
           setMessages((prev) => [...prev, {
@@ -2909,11 +2930,11 @@ var EnhancedSecureP2PChat = () => {
   };
   const handleVerifyConnection = async (userCode, isValid = true) => {
     if (isValid) {
-      webrtcManagerRef2.current.confirmVerification(userCode);
+      webrtcManagerRef.current.confirmVerification(userCode);
       setLocalVerificationConfirmed(true);
       try {
-        if (window.NotificationIntegration && webrtcManagerRef2.current && !notificationIntegrationRef.current) {
-          const integration = new window.NotificationIntegration(webrtcManagerRef2.current);
+        if (window.NotificationIntegration && webrtcManagerRef.current && !notificationIntegrationRef.current) {
+          const integration = new window.NotificationIntegration(webrtcManagerRef.current);
           await integration.init();
           notificationIntegrationRef.current = integration;
           const status = integration.getStatus();
@@ -2971,15 +2992,15 @@ var EnhancedSecureP2PChat = () => {
     if (!messageInput.trim()) {
       return;
     }
-    if (!webrtcManagerRef2.current) {
+    if (!webrtcManagerRef.current) {
       return;
     }
-    if (!webrtcManagerRef2.current.isConnected()) {
+    if (!webrtcManagerRef.current.isConnected()) {
       return;
     }
     try {
       addMessageWithAutoScroll(messageInput.trim(), "sent");
-      await webrtcManagerRef2.current.sendMessage(messageInput);
+      await webrtcManagerRef.current.sendMessage(messageInput);
       setMessageInput("");
     } catch (error) {
       const msg = String(error?.message || error);
@@ -2994,7 +3015,7 @@ var EnhancedSecureP2PChat = () => {
     setOfferInput("");
     setAnswerInput("");
     setShowOfferStep(false);
-    setIsGeneratingKeys2(false);
+    setIsGeneratingKeys(false);
     if (!shouldPreserveAnswerData()) {
       setShowAnswerStep(false);
     }
@@ -3030,8 +3051,8 @@ var EnhancedSecureP2PChat = () => {
         status: "disconnected",
         isUserInitiatedDisconnect: true
       });
-      if (webrtcManagerRef2.current) {
-        webrtcManagerRef2.current.disconnect();
+      if (webrtcManagerRef.current) {
+        webrtcManagerRef.current.disconnect();
       }
       if (notificationIntegrationRef.current) {
         notificationIntegrationRef.current.cleanup();
@@ -3052,7 +3073,7 @@ var EnhancedSecureP2PChat = () => {
       setAnswerInput("");
       setShowOfferStep(false);
       setShowAnswerStep(false);
-      setIsGeneratingKeys2(false);
+      setIsGeneratingKeys(false);
       setShowQRCode(false);
       setQrCodeUrl("");
       setShowQRScanner(false);
@@ -3195,7 +3216,7 @@ var EnhancedSecureP2PChat = () => {
       isConnected: isConnectedAndVerified,
       securityLevel,
       // sessionManager removed - all features enabled by default
-      webrtcManager: webrtcManagerRef2.current
+      webrtcManager: webrtcManagerRef.current
     }),
     React.createElement(
       "main",
@@ -3215,7 +3236,7 @@ var EnhancedSecureP2PChat = () => {
           isVerified,
           chatMessagesRef,
           scrollToBottom,
-          webrtcManager: webrtcManagerRef2.current
+          webrtcManager: webrtcManagerRef.current
         });
       })() : React.createElement(EnhancedConnectionSetup, {
         onCreateOffer: handleCreateOffer,
@@ -3255,9 +3276,11 @@ var EnhancedSecureP2PChat = () => {
         markAnswerCreated,
         notificationIntegrationRef,
         isGeneratingKeys,
+        setIsGeneratingKeys,
         handleCreateOffer,
         relayOnlyMode,
-        setRelayOnlyMode
+        setRelayOnlyMode,
+        webrtcManagerRef
       })
     ),
     // QR Scanner Modal

index.html

@@ -113,7 +113,7 @@
 
 
     <!-- GitHub Pages SEO -->
-    <meta name="description" content="SecureBit.chat v4.4.18 — P2P messenger with ECDH + DTLS + SAS security and 18-layer military-grade cryptography">
+    <meta name="description" content="SecureBit.chat v4.8.7 — P2P messenger with ECDH + DTLS + SAS security and 18-layer military-grade cryptography">
     <meta name="keywords" content="P2P messenger, ECDH, DTLS, SAS, encryption, WebRTC, privacy, ASN.1 validation, military-grade security, 18-layer defense, MITM protection, PFS">
     <meta name="author" content="Volodymyr">
     <link rel="canonical" href="https://github.com/SecureBitChat/securebit-chat/">
@@ -131,6 +131,7 @@
     <meta name="twitter:description" content="P2P messenger with military-grade cryptography">
 
     <title>SecureBit.chat - Enhanced Security Edition</title>
+    <script src="config/ice-servers.js"></script>
     <script src="libs/react/react.production.min.js"></script>
     <script src="libs/react-dom/react-dom.production.min.js"></script>
     <link rel="stylesheet" href="assets/tailwind.css">
@@ -147,13 +148,13 @@
     <!-- Update Manager - система принудительного обновления -->
     <script src="src/utils/updateManager.js"></script>
     <script type="module" src="src/components/UpdateChecker.jsx"></script>
-    <script type="module" src="dist/qr-local.js?v=1779043608721"></script>
-    <script type="module" src="src/components/QRScanner.js?v=1779043608721"></script>
+    <script type="module" src="dist/qr-local.js?v=1779198538664"></script>
+    <script type="module" src="src/components/QRScanner.js?v=1779198538664"></script>
 </head>
 <body>
     <div id="root"></div>
-    <script type="module" src="dist/app-boot.js?v=1779043608721"></script>
-    <script type="module" src="dist/app.js?v=1779043608721"></script>
+    <script type="module" src="dist/app-boot.js?v=1779198538664"></script>
+    <script type="module" src="dist/app.js?v=1779198538664"></script>
 
 <script src="src/scripts/pwa-register.js"></script>
 <script src="./src/pwa/install-prompt.js" type="module"></script>

manifest.json

@@ -1,5 +1,5 @@
 {
-  "name": "SecureBit.chat v4.8.6 - ECDH + DTLS + SAS",
+  "name": "SecureBit.chat v4.8.7 - ECDH + DTLS + SAS",
   "short_name": "SecureBit",
   "description": "P2P messenger with ECDH + DTLS + SAS security, military-grade cryptography and Lightning Network payments",
   "start_url": "./",

meta.json

@@ -1,10 +1,10 @@
 {
-  "version": "1779043608721",
-  "buildVersion": "1779043608721",
-  "appVersion": "4.8.5",
-  "buildTime": "2026-05-17T18:46:48.763Z",
-  "buildId": "1779043608721-4b8c882",
-  "gitHash": "4b8c882",
+  "version": "1779198538664",
+  "buildVersion": "1779198538664",
+  "appVersion": "4.8.7",
+  "buildTime": "2026-05-19T13:48:58.703Z",
+  "buildId": "1779198538664-1cc8732",
+  "gitHash": "1cc8732",
   "generated": true,
-  "generatedAt": "2026-05-17T18:46:48.764Z"
+  "generatedAt": "2026-05-19T13:48:58.704Z"
 }

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "securebit-chat",
-  "version": "4.8.6",
+  "version": "4.8.7",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "securebit-chat",
-      "version": "4.8.6",
+      "version": "4.8.7",
       "license": "MIT",
       "dependencies": {
         "base64-js": "1.5.1",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "securebit-chat",
-  "version": "4.8.6",
+  "version": "4.8.7",
   "description": "Secure P2P Communication Application with End-to-End Encryption",
   "main": "index.html",
   "scripts": {

src/app.jsx

@@ -2005,7 +2005,7 @@ import { installDebugWindowHooks } from './utils/debugWindowHooks.js';
                             }
                         }
         
-                        handleMessage(' SecureBit.chat Enhanced Security Edition v4.8.5 - ECDH + DTLS + SAS initialized. Ready to establish a secure connection with ECDH key exchange, DTLS fingerprint verification, and SAS authentication to prevent MITM attacks.', 'system');
+                        handleMessage(' SecureBit.chat Enhanced Security Edition v4.8.7 - ECDH + DTLS + SAS initialized. Ready to establish a secure connection with ECDH key exchange, DTLS fingerprint verification, and SAS authentication to prevent MITM attacks.', 'system');
         
                         const handleBeforeUnload = (event) => {
                             if (event.type === 'beforeunload' && !isTabSwitching) {

src/network/EnhancedSecureWebRTCManager.js

@@ -257,6 +257,7 @@ this._secureLog('info', '🔒 Enhanced Mutex system fully initialized and valida
     this.sequenceNumber = 0;
     this.expectedSequenceNumber = 0;
     this.sessionSalt = null;
+    this._pendingOfferContext = null;
     
     //   Anti-Replay and Message Ordering Protection
     this.replayWindowSize = 64; // Sliding window for replay protection
@@ -1023,6 +1024,83 @@ this._secureLog('info', '🔒 Enhanced Mutex system fully initialized and valida
         return summary;
     }
 
+    _describeIceCandidatesInSDP(sdp) {
+        if (typeof sdp !== 'string') return [];
+
+        return (sdp.match(/^a=candidate:.*$/gm) || []).map((line) => {
+            const parts = line.slice('a=candidate:'.length).trim().split(/\s+/);
+            const typIndex = parts.findIndex(part => part.toLowerCase() === 'typ');
+            const address = parts[4] || '';
+            const port = parts[5] || '';
+            const candidateType = typIndex >= 0 ? parts[typIndex + 1] || 'unknown' : 'unknown';
+            const protocol = (parts[2] || 'unknown').toLowerCase();
+
+            let addressKind = 'unknown';
+            if (/\.local$/i.test(address)) {
+                addressKind = 'mdns';
+            } else if (/^(10\.|192\.168\.|172\.(1[6-9]|2\d|3[0-1])\.)/.test(address)) {
+                addressKind = 'private-ipv4';
+            } else if (/^\d{1,3}(\.\d{1,3}){3}$/.test(address)) {
+                addressKind = 'public-ipv4';
+            } else if (address.includes(':')) {
+                addressKind = 'ipv6';
+            }
+
+            return {
+                candidateType,
+                protocol,
+                addressKind,
+                portPresent: !!port,
+                tcpType: (() => {
+                    const tcpIndex = parts.findIndex(part => part.toLowerCase() === 'tcptype');
+                    return tcpIndex >= 0 ? parts[tcpIndex + 1] || null : null;
+                })()
+            };
+        });
+    }
+
+    _logIceCandidateDiagnostics(label, sdp, extra = {}) {
+        const candidateSummary = this._summarizeIceCandidatesInSDP(sdp);
+        const candidateDetails = this._describeIceCandidatesInSDP(sdp);
+        console.info(`[SecureBit ICE] ${label}`, {
+            candidateSummary,
+            candidateDetails,
+            candidateDetailsJson: JSON.stringify(candidateDetails),
+            ...extra
+        });
+        return { candidateSummary, candidateDetails };
+    }
+
+    _hasOnlyMdnsHostCandidates(sdp) {
+        const summary = this._summarizeIceCandidatesInSDP(sdp);
+        const details = this._describeIceCandidatesInSDP(sdp);
+
+        return summary.total > 0 &&
+            summary.srflx === 0 &&
+            summary.relay === 0 &&
+            summary.prflx === 0 &&
+            details.every(candidate =>
+                candidate.candidateType === 'host' &&
+                candidate.addressKind === 'mdns'
+            );
+    }
+
+    _warnIfRemoteCandidatesNeedRelay(context, sdp) {
+        if (!this._hasOnlyMdnsHostCandidates(sdp)) return false;
+
+        const message = context === 'answer'
+            ? 'Connection warning: the response contains only browser-masked mDNS host candidates and no server-reflexive or TURN relay candidates. This network/browser combination may not connect until TURN is configured.'
+            : 'Connection warning: the invitation contains only browser-masked mDNS host candidates and no server-reflexive or TURN relay candidates. This network/browser combination may not connect until TURN is configured.';
+
+        this._secureLog('warn', 'Remote ICE candidates require TURN or usable non-mDNS candidates', {
+            context,
+            candidateSummary: this._summarizeIceCandidatesInSDP(sdp),
+            candidateDetails: this._describeIceCandidatesInSDP(sdp)
+        });
+        this.deliverMessageToUI(message, 'system');
+        return true;
+    }
+
     async _collectIceFailureDiagnostics() {
         if (!this.peerConnection?.getStats) return null;
 
@@ -1073,6 +1151,50 @@ this._secureLog('info', '🔒 Enhanced Mutex system fully initialized and valida
         }
     }
 
+    _storePendingOfferContext() {
+        this._pendingOfferContext = {
+            sessionSalt: Array.isArray(this.sessionSalt) ? [...this.sessionSalt] : null,
+            sessionId: this.sessionId || null,
+            connectionId: this.connectionId || null,
+            keyFingerprint: this.keyFingerprint || null,
+            createdAt: Date.now()
+        };
+    }
+
+    _restorePendingOfferContextIfNeeded() {
+        const saltIsValid = Array.isArray(this.sessionSalt) && this.sessionSalt.length === 64;
+        if (saltIsValid) return true;
+
+        const pendingSalt = this._pendingOfferContext?.sessionSalt;
+        if (!Array.isArray(pendingSalt) || pendingSalt.length !== 64) {
+            return false;
+        }
+
+        this.sessionSalt = [...pendingSalt];
+        if (!this.sessionId && this._pendingOfferContext.sessionId) {
+            this.sessionId = this._pendingOfferContext.sessionId;
+        }
+        if (!this.connectionId && this._pendingOfferContext.connectionId) {
+            this.connectionId = this._pendingOfferContext.connectionId;
+        }
+        if (!this.keyFingerprint && this._pendingOfferContext.keyFingerprint) {
+            this.keyFingerprint = this._pendingOfferContext.keyFingerprint;
+        }
+
+        this._secureLog('warn', 'Restored pending offer context before applying answer', {
+            pendingContextAgeMs: Date.now() - (this._pendingOfferContext.createdAt || Date.now())
+        });
+
+        return true;
+    }
+
+    _clearPendingOfferContext() {
+        if (this._pendingOfferContext?.sessionSalt) {
+            this._secureWipeMemory(this._pendingOfferContext.sessionSalt, 'pendingOfferContext.sessionSalt');
+        }
+        this._pendingOfferContext = null;
+    }
+
     /**
      *   Execute all maintenance tasks in a single cycle
      */
@@ -3066,6 +3188,8 @@ this._secureLog('info', '🔒 Enhanced Mutex system fully initialized and valida
                 this._secureWipeMemory(this.connectionId, 'connectionId');
                 this.connectionId = null;
             }
+
+            this._clearPendingOfferContext();
             
             this._secureLog('info', '🔒 Cryptographic materials securely cleaned up');
             
@@ -7389,6 +7513,33 @@ async processMessage(data) {
         return config;
     }
 
+    _summarizeIceServerConfig(iceServers = []) {
+        const summary = {
+            serverCount: 0,
+            stun: 0,
+            turn: 0,
+            turns: 0,
+            hasCredentials: false
+        };
+
+        for (const server of iceServers || []) {
+            summary.serverCount += 1;
+            if (server?.username || server?.credential) {
+                summary.hasCredentials = true;
+            }
+
+            const urls = Array.isArray(server?.urls) ? server.urls : [server?.urls];
+            for (const rawUrl of urls) {
+                const url = String(rawUrl || '').toLowerCase();
+                if (url.startsWith('stun:')) summary.stun += 1;
+                if (url.startsWith('turn:')) summary.turn += 1;
+                if (url.startsWith('turns:')) summary.turns += 1;
+            }
+        }
+
+        return summary;
+    }
+
     _isRelayOnlyMode() {
         return this._config.webrtc.privacyMode === 'relay-only';
     }
@@ -7423,6 +7574,7 @@ async processMessage(data) {
         this._sessionAlive = true;
         const config = this._buildPeerConnectionConfig();
         this._warnIfTurnMissing();
+        console.info('[SecureBit ICE] peer connection config', this._summarizeIceServerConfig(config.iceServers));
 
         this.peerConnection = new RTCPeerConnection(config);
 
@@ -9679,8 +9831,7 @@ async processMessage(data) {
                     iceGatheringDurationMs: Date.now() - offerIceGatheringStartedAt,
                     iceGatheringCompleted: offerIceGatheringCompleted
                 });
-                console.info('[SecureBit ICE] offer export', {
-                    candidateSummary: offerCandidateSummary,
+                this._logIceCandidateDiagnostics('offer export', this.peerConnection.localDescription?.sdp, {
                     iceGatheringState: this.peerConnection.iceGatheringState,
                     iceGatheringDurationMs: Date.now() - offerIceGatheringStartedAt,
                     iceGatheringCompleted: offerIceGatheringCompleted
@@ -9736,6 +9887,7 @@ async processMessage(data) {
                 // Generate connection ID for AAD
                 this.connectionId = Array.from(crypto.getRandomValues(new Uint8Array(8)))
                     .map(b => b.toString(16).padStart(2, '0')).join('');
+                this._storePendingOfferContext();
                 
                 // ============================================
                 // PHASE 11: SECURITY LEVEL CALCULATION
@@ -10322,10 +10474,10 @@ async processMessage(data) {
                         type: 'offer',
                         sdp: offerData.s || offerData.sdp
                     }));
-                    console.info('[SecureBit ICE] remote offer applied', {
-                        candidateSummary: this._summarizeIceCandidatesInSDP(this.peerConnection.remoteDescription?.sdp),
+                    this._logIceCandidateDiagnostics('remote offer applied', this.peerConnection.remoteDescription?.sdp, {
                         signalingState: this.peerConnection.signalingState
                     });
+                    this._warnIfRemoteCandidatesNeedRelay('offer', this.peerConnection.remoteDescription?.sdp);
                     
                     this._secureLog('debug', 'Remote description set successfully', {
                         operationId: operationId,
@@ -10418,8 +10570,7 @@ async processMessage(data) {
                     iceGatheringDurationMs: Date.now() - answerIceGatheringStartedAt,
                     iceGatheringCompleted: answerIceGatheringCompleted
                 });
-                console.info('[SecureBit ICE] answer export', {
-                    candidateSummary: answerCandidateSummary,
+                this._logIceCandidateDiagnostics('answer export', this.peerConnection.localDescription?.sdp, {
                     iceGatheringState: this.peerConnection.iceGatheringState,
                     iceGatheringDurationMs: Date.now() - answerIceGatheringStartedAt,
                     iceGatheringCompleted: answerIceGatheringCompleted
@@ -10676,6 +10827,7 @@ async processMessage(data) {
     _cleanupFailedAnswerCreation() {
         try {
             //   Secure wipe of cryptographic materials
+            this._clearPendingOfferContext();
             this._secureCleanupCryptographicMaterials();
             
             //   Secure wipe of PFS key versions
@@ -10930,11 +11082,12 @@ async processMessage(data) {
             );
             
             // Additional MITM protection: Verify session salt integrity
+            this._restorePendingOfferContextIfNeeded();
             if (!this.sessionSalt || this.sessionSalt.length !== 64) {
                 window.EnhancedSecureCryptoUtils.secureLog.log('error', 'Invalid session salt detected - possible session hijacking', {
                     saltLength: this.sessionSalt ? this.sessionSalt.length : 0
                 });
-                throw new Error('Invalid session salt – possible session hijacking attempt');
+                throw new Error('Missing pending offer context. Apply the response in the original creator window that generated the invitation.');
             }
 
             // Verify that the session salt hasn't been tampered with
@@ -11101,10 +11254,10 @@ async processMessage(data) {
                 type: 'answer',
                 sdp: sdpData
             });
-            console.info('[SecureBit ICE] remote answer applied', {
-                candidateSummary: this._summarizeIceCandidatesInSDP(this.peerConnection.remoteDescription?.sdp),
+            this._logIceCandidateDiagnostics('remote answer applied', this.peerConnection.remoteDescription?.sdp, {
                 signalingState: this.peerConnection.signalingState
             });
+            this._warnIfRemoteCandidatesNeedRelay('answer', this.peerConnection.remoteDescription?.sdp);
             
             this._secureLog('debug', 'Remote description set successfully from answer', {
                 signalingState: this.peerConnection.signalingState

tests/sas-verification.test.mjs

@@ -333,6 +333,105 @@ function createVerificationReadinessManager({
     );
 }
 
+// ICE candidate details are redacted but still expose routing-relevant classes.
+{
+    const sdp = [
+        'v=0',
+        'a=candidate:1 1 UDP 2122252543 192.168.1.2 54400 typ host',
+        'a=candidate:2 1 UDP 1686052607 203.0.113.10 40000 typ srflx',
+        'a=candidate:3 1 TCP 1518280447 abcdef.local 9 typ host tcptype passive'
+    ].join('\r\n');
+
+    assert.deepEqual(
+        EnhancedSecureWebRTCManager.prototype._describeIceCandidatesInSDP.call(createSASManager(), sdp),
+        [
+            { candidateType: 'host', protocol: 'udp', addressKind: 'private-ipv4', portPresent: true, tcpType: null },
+            { candidateType: 'srflx', protocol: 'udp', addressKind: 'public-ipv4', portPresent: true, tcpType: null },
+            { candidateType: 'host', protocol: 'tcp', addressKind: 'mdns', portPresent: true, tcpType: 'passive' }
+        ]
+    );
+}
+
+// ICE diagnostics include a copyable JSON string so browser logs do not hide
+// candidate details behind collapsed DevTools objects.
+{
+    const logs = [];
+    const originalConsoleInfo = console.info;
+    console.info = (...args) => logs.push(args);
+    try {
+        const manager = {
+            _summarizeIceCandidatesInSDP: EnhancedSecureWebRTCManager.prototype._summarizeIceCandidatesInSDP,
+            _describeIceCandidatesInSDP: EnhancedSecureWebRTCManager.prototype._describeIceCandidatesInSDP,
+            _logIceCandidateDiagnostics: EnhancedSecureWebRTCManager.prototype._logIceCandidateDiagnostics
+        };
+        manager._logIceCandidateDiagnostics('test candidates', 'a=candidate:1 1 UDP 1 192.168.1.2 5000 typ host', {
+            signalingState: 'stable'
+        });
+
+        assert.equal(logs[0][0], '[SecureBit ICE] test candidates');
+        assert.equal(typeof logs[0][1].candidateDetailsJson, 'string');
+        assert.match(logs[0][1].candidateDetailsJson, /private-ipv4/);
+        assert.equal(logs[0][1].signalingState, 'stable');
+    } finally {
+        console.info = originalConsoleInfo;
+    }
+}
+
+// Remote mDNS-only candidates are surfaced as a user-visible TURN warning.
+{
+    const messages = [];
+    const manager = {
+        _secureLog() {},
+        deliverMessageToUI(message, type) {
+            messages.push({ message, type });
+        },
+        _summarizeIceCandidatesInSDP: EnhancedSecureWebRTCManager.prototype._summarizeIceCandidatesInSDP,
+        _describeIceCandidatesInSDP: EnhancedSecureWebRTCManager.prototype._describeIceCandidatesInSDP,
+        _hasOnlyMdnsHostCandidates: EnhancedSecureWebRTCManager.prototype._hasOnlyMdnsHostCandidates,
+        _warnIfRemoteCandidatesNeedRelay: EnhancedSecureWebRTCManager.prototype._warnIfRemoteCandidatesNeedRelay
+    };
+    const mdnsOnlySdp = 'a=candidate:1 1 UDP 1 abcdef.local 5000 typ host';
+    const srflxSdp = 'a=candidate:1 1 UDP 1 203.0.113.10 5000 typ srflx';
+
+    assert.equal(manager._hasOnlyMdnsHostCandidates(mdnsOnlySdp), true);
+    assert.equal(manager._warnIfRemoteCandidatesNeedRelay('answer', mdnsOnlySdp), true);
+    assert.equal(messages[0].type, 'system');
+    assert.match(messages[0].message, /TURN is configured/i);
+    assert.equal(manager._hasOnlyMdnsHostCandidates(srflxSdp), false);
+}
+
+// Pending offer context preserves the creator's manual-exchange salt until the
+// answer is applied, even if transient ICE/UI state temporarily loses it.
+{
+    const manager = {
+        sessionSalt: Array.from({ length: 64 }, (_, index) => index),
+        sessionId: 'session-a',
+        connectionId: 'connection-a',
+        keyFingerprint: 'AA:BB',
+        _secureLog() {},
+        _secureWipeMemory() {},
+        _storePendingOfferContext: EnhancedSecureWebRTCManager.prototype._storePendingOfferContext,
+        _restorePendingOfferContextIfNeeded: EnhancedSecureWebRTCManager.prototype._restorePendingOfferContextIfNeeded,
+        _clearPendingOfferContext: EnhancedSecureWebRTCManager.prototype._clearPendingOfferContext
+    };
+
+    manager._storePendingOfferContext();
+    manager.sessionSalt = null;
+    manager.sessionId = null;
+    manager.connectionId = null;
+    manager.keyFingerprint = null;
+
+    assert.equal(manager._restorePendingOfferContextIfNeeded(), true);
+    assert.equal(manager.sessionSalt.length, 64);
+    assert.equal(manager.sessionId, 'session-a');
+    assert.equal(manager.connectionId, 'connection-a');
+    assert.equal(manager.keyFingerprint, 'AA:BB');
+
+    manager._clearPendingOfferContext();
+    manager.sessionSalt = null;
+    assert.equal(manager._restorePendingOfferContextIfNeeded(), false);
+}
+
 // Joining with an offer and generating an answer does not open verification
 // before the answer has been applied by the creator and the channel opens.
 {

tests/webrtc-privacy-mode.test.mjs

@@ -112,4 +112,30 @@ function fake(config = {}) {
     assert.equal(config.iceServers, overrideServers);
 }
 
+// ICE config diagnostics reveal whether TURN credentials were loaded without
+// printing sensitive usernames or passwords.
+{
+    const manager = fake({
+        iceServers: [
+            { urls: 'stun:stun.example.test:3478' },
+            {
+                urls: ['turn:turn.example.test:3478?transport=udp', 'turns:turn.example.test:443?transport=tcp'],
+                username: 'user',
+                credential: 'secret'
+            }
+        ]
+    });
+    const summary = EnhancedSecureWebRTCManager.prototype._summarizeIceServerConfig.call(
+        manager,
+        manager._config.webrtc.iceServers
+    );
+    assert.deepEqual(summary, {
+        serverCount: 2,
+        stun: 1,
+        turn: 1,
+        turns: 1,
+        hasCredentials: true
+    });
+}
+
 console.log('WebRTC privacy mode tests passed');