SSL Pinning即证书锁定，将服务器提供的SSL/TLS证书内置到移动端开发的APP客户端中，当客户端发起请求时，通过比对内置的证书和服务器端证书的内容，以确定这个连接的合法性。
0x02 环境
Win10[出自:
jiwo.org
]
安卓模拟器（夜神模拟器）
Frida（Python 3.7）
adb工具
apk（途牛apk）
0x03 利用Frida绕过SSL Pinning
绕过原理：
客户端请求时会将内置的证书与服务端的证书做一次性校验，通过hook的方式将此次校验的结果返回true或者干脆不让其做校验即可以绕过。当安卓APP初始化SSLContext时，我们使用frida劫持SSLContext.init方法，使用我们自己创建的TrustManager , 把它作为实参传入SSLContext.init方法的第二个参数( SSLContext.init(KeyManager，TrustManager，SecuRandom) 。这样就能使得APP信任我们的CA，以上操作都是通过一个js脚本注入实现的。
这里我们使用的是夜神模拟器，它默认使用Android 5版本的，就是因为这个点，这里踩坑踩了很久，夜神的Android版本低会导致下面在启用Frida-server时报错，因此这里需要使用Android 7以上。
Android低版本报错如下
Android SSL Re-pinning frida script v0.2 030417-pier
$ adb push burpca-cert-der.crt /data/local/tmp/cert-der.crt
$ frida -U -f it.app.mobile -l frida-android-repinning.js --no-pause
https://techblog.mediaservice.net/2017/07/universal-android-ssl-pinning-bypass-with-frida/
UPDATE 20191605: Fixed undeclared var. Thanks to @oleavr and @ehsanpc9999 !
setTimeout(function(){
Java.perform(function (){
console.log("");
console.log("[.] Cert Pinning Bypass/Re-Pinning");
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 {
var fileInputStream = FileInputStream.$new("/data/local/tmp/cert-der.crt");
catch(err) {
console.log("[o] " + err);
var bufferedInputStream = BufferedInputStream.$new(fileInputStream);
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!");
},0);
