android获取https证书

最近碰到一个问题，有朋友问android这边能不能拿到服务器下发的证书，意思就是自签名证书的https接口，在请求的时候，也没有添加自签名证书进信任列表，直接去发https请求，按照正常https步骤去理解，服务器会返回一个证书，这个证书由于客户端没有添加进信任列表，会导致https请求失败，提示没有找到信任的证书。朋友疑问：在服务器返回证书的时候，能不能强行信任呢？

针对这个问题，我在这边做了测试：

1，由ca签发的ssl证书，部署一个服务

　　不设置请求的SSLSocketFactory，直接进行https请求

　　　　验证结果：ok

2，自签名的ssl证书，部署一个服务

　不设置请求的SSLSocketFactory，直接进行https请求

　　　　验证结果：error，报错信息 java.security.cert.CertPathValidatorException: Trust anchor for certification path not found，大体意思是没有找打信任的证书，也就是说这个证书没有被当前的请求对象所信任。

看报错信息是android系统已经封装好的证书校验规则。

但是如果不想本地预埋自签名证书，也不想让后台暴露证书下载的接口，该怎么办呢？

我这边提供一个比较简陋的方法，通过webview访问目标https地址，通过webview的onReceivedSslError方法，拿到SslError中的SslCertificate，然后再根据SslCertificate中的saveState方法获取Bundle，从bundle中拿到"x509-certificate"的字节数组，作为字节流读取流，通过通用的httpsutils，设置请求对象的sslsocketfactory。

代码如下：

package com.example.ajaxhttpsdemo;

import android.content.Context;

import android.net.http.SslCertificate;

import android.net.http.SslError;

import android.os.Bundle;

import android.os.Handler;

import android.util.Log;

import android.webkit.SslErrorHandler;

import android.webkit.WebSettings;

import android.webkit.WebView;

import android.webkit.WebViewClient;

import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.security.KeyManagementException;

import java.security.KeyStore;

import java.security.KeyStoreException;

import java.security.NoSuchAlgorithmException;

import java.security.cert.CertificateException;

import java.security.cert.CertificateFactory;

import java.security.cert.X509Certificate;

import javax.net.ssl.KeyManager;

import javax.net.ssl.KeyManagerFactory;

import javax.net.ssl.SSLContext;

import javax.net.ssl.SSLException;

import javax.net.ssl.SSLSocketFactory;

import javax.net.ssl.TrustManager;

import javax.net.ssl.TrustManagerFactory;

import javax.net.ssl.X509TrustManager;

public class HttpsGetSSLSocketFactory {

    private static SslCertificate sslCertificate;

    public static class SSLParams {

        public SSLSocketFactory sSLSocketFactory;

        public X509TrustManager trustManager;

    }

    public interface Callback{

        void onSuccess(SSLParams sslParams);

        void onError(Exception e);

    }

    public static class MySSLException extends Exception{

        public MySSLException(String str) {

            super(str);

        }

    }

    public static void getSslSocketFactoryOnMainThread(Context context, String httpsUrl, final Callback callback){

        WebView webView = new WebView(context);

        webView.setWebViewClient(new WebViewClient(){

            @Override

            public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {

                sslCertificate = error.getCertificate();

                handler.proceed();

                if (sslCertificate!=null){

                    Bundle bundle = SslCertificate.saveState(sslCertificate);

                    byte[] byteArray = bundle.getByteArray("x509-certificate");//从bundle中拿出写入的x509证书

//                    byte[] byteArray = "123456".getBytes();//测试错误证书

                   if (byteArray!=null && byteArray.length>0){

                       try {

                           callback.onSuccess(getSslSocketFactory(new ByteArrayInputStream(byteArray)));

                       } catch (Exception e) {

                           callback.onError(e);

                       }

                   }

                }else {

                    callback.onError(new MySSLException("没有获取到服务器证书"));

                }

            }

        });

        webView.getSettings().setJavaScriptEnabled(true);

        webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);

        webView.loadUrl(httpsUrl);

    }

    private static SSLParams getSslSocketFactory(InputStream... certificates) throws Exception {

        SSLParams sslParams = new SSLParams();

        try {

            TrustManager[] trustManagers = prepareTrustManager(certificates);

            KeyManager[] keyManagers = prepareKeyManager(null, null);

            SSLContext sslContext = SSLContext.getInstance("TLS");

            X509TrustManager trustManager;

            if (trustManagers != null) {

                trustManager = new MyTrustManager(

                        chooseTrustManager(trustManagers));

            } else {

                throw new Exception("证书错误");

            }

            sslContext.init(keyManagers,

                    new TrustManager[]{trustManager}, null);

            sslParams.sSLSocketFactory = sslContext.getSocketFactory();

            sslParams.trustManager = trustManager;

            return sslParams;

        } catch (NoSuchAlgorithmException e) {

            throw new AssertionError(e);

        } catch (KeyManagementException e) {

            throw new AssertionError(e);

        } catch (KeyStoreException e) {

            throw new AssertionError(e);

        } catch (Exception e) {

            throw e;

        }

    }

    private static X509TrustManager chooseTrustManager(

            TrustManager[] trustManagers) {

        for (TrustManager trustManager : trustManagers) {

            if (trustManager instanceof X509TrustManager) {

                return (X509TrustManager) trustManager;

            }

        }

        return null;

    }

    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) {

                    e.printStackTrace();

                }

            }

            TrustManagerFactory trustManagerFactory;

            trustManagerFactory = TrustManagerFactory

                    .getInstance(TrustManagerFactory.getDefaultAlgorithm());

            trustManagerFactory.init(keyStore);

            return trustManagerFactory.getTrustManagers();

        } 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 (Exception e) {

            e.printStackTrace();

        }

        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];

        }

    }

}

巴特西

android获取https证书

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