WebRTC Leak Test: Comprehensive Guide to Detect and Prevent IP Leak

Introduction to WebRTC IP Leak Test

Understanding WebRTC Technology

Peer-to-Peer Connection

Data Channels

Media Streams

How to Identifying WebRTC Leak Test

Browser-based Testing Tools

Manual Testing

1- Open your browser's developer tools (usually accessible via F12 or right-click -> Inspect).
2- Navigate to the "Network" tab.
3- Perform a WebRTC connection by visiting a site that uses WebRTC or by creating a test connection using JavaScript.
4- Look for any network requests that reveal your real IP address.

Browser Extensions

Command-Line Tools

• VPN/Proxy Bypass: WebRTC can bypass VPNs and proxies by establishing direct connections that reveal the user's true IP address.
• NAT/Firewall Traversal: WebRTC's use of STUN and TURN servers to traverse NATs and firewalls can result in the exposure of local IP addresses.
• Misconfigured Browsers: Browsers with default or misconfigured settings may inadvertently expose IP addresses during WebRTC connections.

WebRTC Leak Test Implementation

1const testWebRTCLeak = async () => {
2      try {
3        // Create a new RTCPeerConnection
4        const rtcConnection = new RTCPeerConnection();
5    
6        // Create a data channel (needed to initiate the connection)
7        rtcConnection.createDataChannel("");
8    
9        // Create an offer and set the local description
10        const offer = await rtcConnection.createOffer();
11        await rtcConnection.setLocalDescription(offer);
12    
13        // Initialize an array to hold detected IP addresses
14        const ipAddresses = [];
15    
16        // Set up an event listener for ICE candidates
17        rtcConnection.onicecandidate = (event) => {
18          if (event.candidate) {
19            // Extract IP address from the ICE candidate
20            const ipRegex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-fA-F0-9:]+)/;
21            const ipMatch = ipRegex.exec(event.candidate.candidate);
22            if (ipMatch) {
23              ipAddresses.push(ipMatch[1]);
24            }
25          } else {
26            // No more candidates, log the detected IP addresses
27            console.log("IP Addresses detected: ", ipAddresses);
28          }
29        };
30      } catch (error) {
31        console.error("WebRTC leak test failed:", error);
32      }
33    };
34    
35    // Run the WebRTC leak test
36    testWebRTCLeak();

Preventing WebRTC Leaks

Browser Settings

1 - **Google Chrome**: Go to `chrome://flags/` and disable WebRTC STUN origin header by setting "Anonymize local IPs exposed by WebRTC" to "Enabled".
2 - **Mozilla Firefox**: In the address bar, type `about:config` and set `media.peerconnection.enabled` to `false`. 

Browser Extensions

1  - **Chrome**: "WebRTC Leak Prevent", "uBlock Origin" with WebRTC leak prevention settings.
2  - **Firefox**: "Disable WebRTC", "uBlock Origin" with similar settings.

VPN Services

1  - Ensure your VPN provider explicitly mentions WebRTC leak prevention in their features.
2  - Test your VPN connection with WebRTC leak detection tools to verify its effectiveness. 

Custom Configuration

1 {
2      "webRTCIPHandlingPolicy": "default_public_interface_only",
3      "webRTCMultipleRoutesEnabled": false
4 }

Testing WebRTC Leaks Across Different Browsers

Google Chrome

• Default Behavior: Chrome may expose both local and public IP addresses through WebRTC.
• Testing: Use online tools like "IPLeak.net" or run the provided JavaScript script in Chrome's developer console to check for leaks.
• Prevention: Modify settings in chrome://flags/ and use extensions like "WebRTC Leak Prevent".
  ### Mozilla Firefox
• Default Behavior: Firefox generally handles WebRTC more securely but may still expose local IP addresses.
• Testing: Use the provided script in Firefox's developer console or visit "BrowserLeaks.com".
• Prevention: Change settings in about:config and use extensions like "Disable WebRTC".

Microsoft Edge

• Default Behavior: Similar to Chrome, Edge can expose local and public IP addresses.
• Testing: Use the provided script or online tools to detect leaks.
• Prevention: Use settings in Edge's experimental features and extensions like "uBlock Origin".

Apple Safari

• Default Behavior: Safari has stricter privacy measures but may still expose IP addresses under certain conditions.
• Testing: Use the provided script or tools like "BrowserLeaks.com".
• Prevention: Configure Safari settings and use extensions that block WebRTC traffic.

  1const testWebRTCLeak = async () => {
  2    try {
  3      const rtcConnection = new RTCPeerConnection();
  4      rtcConnection.createDataChannel("");
  5      const offer = await rtcConnection.createOffer();
  6      await rtcConnection.setLocalDescription(offer);
  7      const ipAddresses = [];
  8      rtcConnection.onicecandidate = (event) => {
  9        if (event.candidate) {
  10          const ipRegex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-fA-F0-9:]+)/;
  11          const ipMatch = ipRegex.exec(event.candidate.candidate);
  12          if (ipMatch) {
  13            ipAddresses.push(ipMatch[1]);
  14          }
  15        } else {
  16          console.log("IP Addresses detected: ", ipAddresses);
  17        }
  18      };
  19    } catch (error) {
  20      console.error("WebRTC leak test failed:", error);
  21    }
  22  };
  23  
  24  testWebRTCLeak();