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避免HttpClient的”javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated”異常

在開發https應用時,你的測試伺服器常常沒有一個(有效的)SSL證書。在你的客戶端連線測試伺服器時,如下的異常會被丟擲:”javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated”。

解決方案:修改建立HttpClient的方式
分析:
1.需要告訴client使用一個不同的TrustManager。TrustManager是一個檢查給定的證書是否有效的類。SSL使用的模式是X.509,對於該模式Java有一個特定的TrustManager,稱為X509TrustManager。首先我們需要建立這樣的TrustManager。
2.將TrustManager設定到我們的HttpClient。TrustManager只是被SSL的Socket所使用。Socket通過

SocketFactory建立。對於SSL Socket,有一個SSLSocketFactory。當建立新的SSLSocketFactory時,你需要傳入SSLContext到它的構造方法中。在SSLContext中,我們將包含我們新建立的TrustManager。

所以
1.建立的TrustManager
2.建立SSLContext:TLS是SSL的繼承者,但是它們使用相同的SSLContext。
3.建立SSLSocketFactory
4.將SSLSocketFactory註冊到我們的HttpClient上。這是在SchemeRegistry中完成的。
4.1.建立ClientConnectionManager
4.2.建立SchemeRegistry
5.生成HttpClient

程式碼:

import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import org.apache.http.client.HttpClient;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;

public class WebClientDevWrapper {

    public static HttpClient wrapClient(HttpClient base) {
        try {
            SSLContext ctx = SSLContext.getInstance("TLS");
            X509TrustManager tm = new X509TrustManager() {
                public X509Certificate[] getAcceptedIssuers() {
                    return null;
                }
                public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {}
                public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {}
            };
            ctx.init(null, new TrustManager[] { tm }, null);
            SSLSocketFactory ssf = new SSLSocketFactory(ctx, SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
            
            ClientConnectionManager ccm=base.getConnectionManager();
            SchemeRegistry registry = ccm.getSchemeRegistry();
            registry.register(new Scheme("https", 443, ssf));
            return new DefaultHttpClient(ccm, base.getParams());
            
           /* SchemeRegistry registry = new SchemeRegistry();
            registry.register(new Scheme("https", 443, ssf));
            ThreadSafeClientConnManager mgr = new ThreadSafeClientConnManager(registry);
            return new DefaultHttpClient(mgr, base.getParams());*/
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }
    }
}