Fiddler 4 SSL pinning bypass

//Thanks to https://codeshare.frida.re/@pcipolloni/universal-android-ssl-pinning-bypass-with-frida/
//At the moment, this seems to fix the SSL exceptions, but bypass the proxy itself!

//If you have any idea why Android would ignore the proxy setting completely after the following runs, please email androidbugs@voltagex.org - thanks!
(function () {
    Java.perform(function() {
        console.log("");
        console.log("[.] Cert Pinning Bypass/Re-Pinning");
        
        var URL = Java.use('java.net.URL');
        var InputStreamReader = Java.use('java.io.InputStreamReader');
	    var CertificateFactory = Java.use("java.security.cert.CertificateFactory");
	    var FileInputStream = Java.use("java.io.FileInputStream");
	    var BufferedInputStream = Java.use("java.io.BufferedInputStream");
	    var X509Certificate = Java.use("java.security.cert.X509Certificate");
	    var KeyStore = Java.use("java.security.KeyStore");
	    var TrustManagerFactory = Java.use("javax.net.ssl.TrustManagerFactory");
	    var SSLContext = Java.use("javax.net.ssl.SSLContext");

	    // Load CAs from an InputStream
	    console.log("[+] Loading our CA...")
	    var cf = CertificateFactory.getInstance("X.509");
	    
	    try {
            //this assumes you've already got the system proxy set to use Fiddler
            var fiddlerUrl = URL.$new("http://ipv4.fiddler:8888/FiddlerRoot.cer");
            var connection = fiddlerUrl.openConnection();
        
	    }
	    catch(err) {
	    	console.log("[o] " + err);
	    }
	    
	    var bufferedInputStream = BufferedInputStream.$new(connection.getInputStream());
	  	var ca = cf.generateCertificate(bufferedInputStream);
	    bufferedInputStream.close();

		var certInfo = Java.cast(ca, X509Certificate);
	    console.log("[o] Our CA Info: " + certInfo.getSubjectDN());

	    // Create a KeyStore containing our trusted CAs
	    console.log("[+] Creating a KeyStore for our CA...");
	    var keyStoreType = KeyStore.getDefaultType();
	    var keyStore = KeyStore.getInstance(keyStoreType);
	    keyStore.load(null, null);
	    keyStore.setCertificateEntry("ca", ca);
	    
	    // Create a TrustManager that trusts the CAs in our KeyStore
	    console.log("[+] Creating a TrustManager that trusts the CA in our KeyStore...");
	    var tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
	    var tmf = TrustManagerFactory.getInstance(tmfAlgorithm);
	    tmf.init(keyStore);
	    console.log("[+] Our TrustManager is ready...");

	    console.log("[+] Hijacking SSLContext methods now...")
	    console.log("[-] Waiting for the app to invoke SSLContext.init()...")

	   	SSLContext.init.overload("[Ljavax.net.ssl.KeyManager;", "[Ljavax.net.ssl.TrustManager;", "java.security.SecureRandom").implementation = function(a,b,c) {
	   		console.log("[o] App invoked javax.net.ssl.SSLContext.init...");
	   		SSLContext.init.overload("[Ljavax.net.ssl.KeyManager;", "[Ljavax.net.ssl.TrustManager;", "java.security.SecureRandom").call(this, a, tmf.getTrustManagers(), c);
	   		console.log("[+] SSLContext initialized with our custom TrustManager!");
           

           }
        })})();