Android 让WebView完美支持https双向认证(SSL)

转自：http://blog.csdn.net/kpioneer123/article/details/51491739

 这是@happyzhang0502   关于webview https的建议：

 最近做一个安全级别比较高的项目，对方要求使用HTTPS双向认证来访问web网页。双向认证在android5.0以上很好解决，但是在Android5.0以下，webviewclient中没有客户端向服务器发送证书的回调接口（回调是个隐藏函数）。

网上搜索到大概有这么几种解决方法：

1.      利用反射调用隐藏函数（不太现实，这个方法为回调方法）

2.      自己编译完整的class.jar(试过了，没成功，成本很大)

3.      重写webview（不可能，工作量巨大）

经过上面的几种想法后来在网上高人的指点下有了第四种方法。

解决方法：拦截Webview的Request的请求，然后自己实现httpconnection捞取数据,然后返回新的WebResourceResponse给Webview。重写webviewclient中的shouldInterceptRequest方法即可。

下面我来给大家具体实现方法：

step1：生成两个证书

server.cer  服务器端证书
client.p12   客户端证书 （需要记住密码加入之后的java文件中）

将这两个证书放在 Android assets 文件下。

step2：重写WebViewClient引入两个证书

SslPinningWebViewClient.java

 package com.cloudhome.webview_https;

 import android.annotation.TargetApi;
 import android.content.Context;
 import android.net.Uri;
 import android.util.Base64;
 import android.util.Log;
 import android.webkit.WebResourceRequest;
 import android.webkit.WebResourceResponse;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;

 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
 import java.security.KeyManagementException;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
 import java.security.UnrecoverableKeyException;
 import java.security.cert.CertPathValidatorException;
 import java.security.cert.CertificateException;
 import java.security.cert.CertificateFactory;
 import java.security.cert.X509Certificate;

 import javax.net.ssl.HttpsURLConnection;
 import javax.net.ssl.KeyManager;
 import javax.net.ssl.KeyManagerFactory;
 import javax.net.ssl.SSLContext;
 import javax.net.ssl.SSLHandshakeException;
 import javax.net.ssl.TrustManager;
 import javax.net.ssl.TrustManagerFactory;
 import javax.net.ssl.X509TrustManager;

 /**
  * Created by mennomorsink on 06/05/15.
  */
 public class SslPinningWebViewClient extends WebViewClient {

     private LoadedListener listener;
     private SSLContext sslContext;

     public SslPinningWebViewClient(LoadedListener listener)throws IOException  {
         this.listener = listener;

         prepareSslPinning(MyApplication.mContext.getResources().getAssets().open("server.cer"));
     }

     @Override
     public WebResourceResponse shouldInterceptRequest (final WebView view, String url) {
         if(MainActivity.pinningSwitch.isChecked()) {
             return processRequest(Uri.parse(url));
         } else {
             return null;
         }
     }

     @Override
     @TargetApi(21)
     public WebResourceResponse shouldInterceptRequest (final WebView view, WebResourceRequest interceptedRequest) {
         if(MainActivity.pinningSwitch.isChecked()) {
             return processRequest(interceptedRequest.getUrl());
         } else {
             return null;
         }
     }

     private WebResourceResponse processRequest(Uri uri) {
         Log.d("SSL_PINNING_WEBVIEWS", "GET: " + uri.toString());

         try {
             // Setup connection
             URL url = new URL(uri.toString());
             HttpsURLConnection urlConnection = (HttpsURLConnection) url.openConnection();

             // Set SSL Socket Factory for this request
             urlConnection.setSSLSocketFactory(sslContext.getSocketFactory());

             // Get content, contentType and encoding
             InputStream is = urlConnection.getInputStream();
             String contentType = urlConnection.getContentType();
             String encoding = urlConnection.getContentEncoding();

             // If got a contentType header
             if(contentType != null) {

                 String mimeType = contentType;

                 // Parse mime type from contenttype string
                 if (contentType.contains(";")) {
                     mimeType = contentType.split(";")[0].trim();
                 }

                 Log.d("SSL_PINNING_WEBVIEWS", "Mime: " + mimeType);

                 listener.Loaded(uri.toString());

                 // Return the response
                 return new WebResourceResponse(mimeType, encoding, is);
             }

         } catch (SSLHandshakeException e) {
             if(isCause(CertPathValidatorException.class, e)) {
                 listener.PinningPreventedLoading(uri.getHost());
             }
             Log.d("SSL_PINNING_WEBVIEWS", e.getLocalizedMessage());
         } catch (Exception e) {
             Log.d("SSL_PINNING_WEBVIEWS", e.getLocalizedMessage());
         }

         // Return empty response for this request
         return new WebResourceResponse(null, null, null);
     }

     private void prepareSslPinning(InputStream... certificates)throws IOException {

         try {



             InputStream inputStream = MyApplication.mContext.getResources().getAssets().open("client.p12");

             TrustManager[] trustManagers = prepareTrustManager(certificates);
             KeyManager[] keyManagers = prepareKeyManager(inputStream, "your client.p12 password");

             sslContext = SSLContext.getInstance("TLS");

             sslContext.init(keyManagers, new TrustManager[]{new MyTrustManager(chooseTrustManager(trustManagers))}, new SecureRandom());


         } catch (NoSuchAlgorithmException e) {
             e.printStackTrace();
         } catch (KeyStoreException e) {
             e.printStackTrace();
         } catch (KeyManagementException e) {
             e.printStackTrace();
         }
     }




     private static TrustManager[] prepareTrustManager(InputStream... certificates)
     {
         if (certificates == null || certificates.length <= 0) return null;
         try
         {

             CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
             KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
             keyStore.load(null);
             int index = 0;
             for (InputStream certificate : certificates)
             {
                 String certificateAlias = Integer.toString(index++);
                 keyStore.setCertificateEntry(certificateAlias, certificateFactory.generateCertificate(certificate));
                 try
                 {
                     if (certificate != null)
                         certificate.close();
                 } catch (IOException e)

                 {
                 }
             }
             TrustManagerFactory trustManagerFactory = null;

             trustManagerFactory = TrustManagerFactory.
                     getInstance(TrustManagerFactory.getDefaultAlgorithm());
             trustManagerFactory.init(keyStore);

             TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();

             return trustManagers;
         } catch (NoSuchAlgorithmException e)
         {
             e.printStackTrace();
         } catch (CertificateException e)
         {
             e.printStackTrace();
         } catch (KeyStoreException e)
         {
             e.printStackTrace();
         } catch (Exception e)
         {
             e.printStackTrace();
         }
         return null;

     }

     private static KeyManager[] prepareKeyManager(InputStream bksFile, String password)
     {
         try
         {
             if (bksFile == null || password == null) return null;

             KeyStore clientKeyStore = KeyStore.getInstance("PKCS12");
             clientKeyStore.load(bksFile, password.toCharArray());
             KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
             keyManagerFactory.init(clientKeyStore, password.toCharArray());
             return keyManagerFactory.getKeyManagers();

         } catch (KeyStoreException e)
         {
             e.printStackTrace();
         } catch (NoSuchAlgorithmException e)
         {
             e.printStackTrace();
         } catch (UnrecoverableKeyException e)
         {
             e.printStackTrace();
         } catch (CertificateException e)
         {
             e.printStackTrace();
         } catch (IOException e)
         {
             e.printStackTrace();
         } catch (Exception e)
         {
             e.printStackTrace();
         }
         return null;
     }

     private static X509TrustManager chooseTrustManager(TrustManager[] trustManagers)
     {
         for (TrustManager trustManager : trustManagers)
         {
             if (trustManager instanceof X509TrustManager)
             {
                 return (X509TrustManager) trustManager;
             }
         }
         return null;
     }


     private static class MyTrustManager implements X509TrustManager
     {
         private X509TrustManager defaultTrustManager;
         private X509TrustManager localTrustManager;

         public MyTrustManager(X509TrustManager localTrustManager) throws NoSuchAlgorithmException, KeyStoreException
         {
             TrustManagerFactory var4 = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
             var4.init((KeyStore) null);
             defaultTrustManager = chooseTrustManager(var4.getTrustManagers());
             this.localTrustManager = localTrustManager;
         }


         @Override
         public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException
         {

         }

         @Override
         public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException
         {
             try
             {
                 defaultTrustManager.checkServerTrusted(chain, authType);
             } catch (CertificateException ce)
             {
                 localTrustManager.checkServerTrusted(chain, authType);
             }
         }


         @Override
         public X509Certificate[] getAcceptedIssuers()
         {
             return new X509Certificate[0];
         }
     }

     public static boolean isCause(
             Classextends Throwable> expected,
             Throwable exc
     ) {
         return expected.isInstance(exc) || (
                 exc != null && isCause(expected, exc.getCause())
         );
     }
 }

step3：重写的WebViewClient ：SslPinningWebViewClient加入到webview中

 package com.cloudhome.webview_https;

 import android.content.Context;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.view.View;
 import android.webkit.WebView;
 import android.widget.Button;
 import android.widget.Switch;
 import android.widget.TextView;

 import java.io.IOException;

 public class MainActivity extends AppCompatActivity {

     private WebView webView;
     public static Switch pinningSwitch;
     private Button btnA;
     private Button btnB;
     public static TextView textView;

     private String url1 = "your https url";
     private String url2 = "your https url";

     public MainActivity() {
     }
     public static Context mContext;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         webView = (WebView)findViewById(R.id.webView);
         webView.getSettings().setJavaScriptEnabled(true);

         pinningSwitch = (Switch)findViewById(R.id.pinningSwitch);
         btnA = (Button)findViewById(R.id.btn1);
         btnB = (Button)findViewById(R.id.btn2);
         textView = (TextView)findViewById(R.id.textView);

         mContext=this;
         SslPinningWebViewClient webViewClient = null;
         try {
             webViewClient = new SslPinningWebViewClient(new LoadedListener() {
                 @Override
                 public void Loaded(final String url) {
                     runOnUiThread(new Runnable() {
                         @Override
                         public void run() {
                             textView.setText("Loaded " + url);
                         }
                     });
                 }

                 @Override
                 public void PinningPreventedLoading(final String host) {
                     runOnUiThread(new Runnable() {
                         @Override
                         public void run() {
                             textView.setText("SSL Pinning prevented loading from " + host);
                         }
                     });
                 }
             });
         } catch (IOException e) {
             e.printStackTrace();
         }
         webView.setWebViewClient(webViewClient);

         btnA.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  webView.clearView();
                  textView.setText("");
                  webView.loadUrl(url1);
              }
          });

         btnB.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 webView.clearView();
                 textView.setText("");
                 webView.loadUrl(url2);
             }
         });
     }
 }

step4：下载回调监听借口LoadedListener借口（根据实际情况使用）

 package com.cloudhome.webview_https;

 /**
  * Created by mennomorsink on 25/07/15.
  */
 public interface LoadedListener {
     void Loaded(String url);
     void PinningPreventedLoading(String host);
 }

运行效果：

开始前

运行中加载图片（链接中有其它https请求）

最后加载完成

参考资料：

http://blog.csdn.net/lmj623565791/article/details/48129405

http://blog.csdn.net/zhangyong125/article/details/50562865