java - Java：禁用 SSL 证书检查的覆盖函数

Question

Web 服务基于 SSL，它具有自签名证书，托管在远程系统中。我已经创建了一个访问该 Web 服务的客户端。这是通过以 编程方式将证书添加到密钥库来完成的。

现在我听说，没有必要将证书添加到密钥库以访问自签名 Web 服务。相反，我们可以通过覆盖一些方法来禁用证书检查。这是真的？那些方法是什么？请帮忙。

Answer 1

这应该足够了。我在针对没有正确签名证书的测试和登台服务器测试代码时使用它。但是，您真的应该认真考虑在生产服务器上获取有效的 SSL 证书。没有人愿意被窃听并侵犯他们的隐私。

SSLContext sc = SSLContext.getInstance("TLS");
sc.init(null, new TrustManager[] { new TrustAllX509TrustManager() }, new java.security.SecureRandom());
HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
HttpsURLConnection.setDefaultHostnameVerifier( new HostnameVerifier(){
    public boolean verify(String string,SSLSession ssls) {
        return true;
    }
});

和这个。

import javax.net.ssl.X509TrustManager;
import java.security.cert.X509Certificate;

/**
 * DO NOT USE IN PRODUCTION!!!!
 * 
 * This class will simply trust everything that comes along.
 * 
 * @author frank
 *
 */
public class TrustAllX509TrustManager implements X509TrustManager {
    public X509Certificate[] getAcceptedIssuers() {
        return new X509Certificate[0];
    }

    public void checkClientTrusted(java.security.cert.X509Certificate[] certs,
            String authType) {
    }

    public void checkServerTrusted(java.security.cert.X509Certificate[] certs,
            String authType) {
    }

}

祝你好运！

===更新===

我只是想指出，有一项名为Let's Encrypt的服务可以自动生成和设置几乎所有人都认可的 SSL/TLS 证书，而且它是完全免费的！

Answer 2

忽略每个连接的证书要安全得多，因为任何其他代码仍将使用安全默认值。

以下代码：

• 在每个连接的基础上覆盖信任管理器和主机名验证器。
• 重用 SSLSocketFactory 以支持持久连接，绕过对同一服务器的重复请求的昂贵 SSL 握手。

正如其他人所说，这应该只用于测试，和/或用于与其他内部系统通信的内部系统。

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

public class TestPersistentConnection
{
    private static SSLSocketFactory sslSocketFactory = null;

    /**
     * Use the VM argument <code>-Djavax.net.debug=ssl</code> for SSL specific debugging;
     * the SSL handshake will appear a single time when connections are re-used, and multiple
     * times when they are not.
     * 
     * Use the VM <code>-Djavax.net.debug=all</code> for all network related debugging, but 
     * note that it is verbose.
     * 
     * @throws Exception
     */
    public static void main(String[] args) throws Exception
    {

        //URL url = new URL("https://google.com/");
        URL url = new URL("https://localhost:8443/");

        // Disable first
        request(url, false);

        // Enable; verifies our previous disable isn't still in effect.
        request(url, true);
    }

    public static void request(URL url, boolean enableCertCheck) throws Exception {
        BufferedReader reader = null;
        // Repeat several times to check persistence.
        System.out.println("Cert checking=["+(enableCertCheck?"enabled":"disabled")+"]");
        for (int i = 0; i < 5; ++i) {
            try {

                HttpURLConnection httpConnection = (HttpsURLConnection) url.openConnection();

                // Normally, instanceof would also be used to check the type.
                if( ! enableCertCheck ) {
                    setAcceptAllVerifier((HttpsURLConnection)httpConnection);
                }

                reader = new BufferedReader(new InputStreamReader(httpConnection.getInputStream()), 1);

                char[] buf = new char[1024];
                StringBuilder sb = new StringBuilder();
                int count = 0;
                while( -1 < (count = reader.read(buf)) ) {
                    sb.append(buf, 0, count);
                }
                System.out.println(sb.toString());

                reader.close();

            } catch (IOException ex) {
                System.out.println(ex);

                if( null != reader ) {
                    reader.close();
                }
            }
        }
    }

    /**
     * Overrides the SSL TrustManager and HostnameVerifier to allow
     * all certs and hostnames.
     * WARNING: This should only be used for testing, or in a "safe" (i.e. firewalled)
     * environment.
     * 
     * @throws NoSuchAlgorithmException
     * @throws KeyManagementException
     */
    protected static void setAcceptAllVerifier(HttpsURLConnection connection) throws NoSuchAlgorithmException, KeyManagementException {

        // Create the socket factory.
        // Reusing the same socket factory allows sockets to be
        // reused, supporting persistent connections.
        if( null == sslSocketFactory) {
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, ALL_TRUSTING_TRUST_MANAGER, new java.security.SecureRandom());
            sslSocketFactory = sc.getSocketFactory();
        }

        connection.setSSLSocketFactory(sslSocketFactory);

        // Since we may be using a cert with a different name, we need to ignore
        // the hostname as well.
        connection.setHostnameVerifier(ALL_TRUSTING_HOSTNAME_VERIFIER);
    }

    private static final TrustManager[] ALL_TRUSTING_TRUST_MANAGER = new TrustManager[] {
        new X509TrustManager() {
            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }
            public void checkClientTrusted(X509Certificate[] certs, String authType) {}
            public void checkServerTrusted(X509Certificate[] certs, String authType) {}
        }
    };

    private static final HostnameVerifier ALL_TRUSTING_HOSTNAME_VERIFIER  = new HostnameVerifier() {
        public boolean verify(String hostname, SSLSession session) {
            return true;
        }
    };

}

非常感谢： http ://runtime32.blogspot.com/2008/11/let-java-ssl-trust-all-certificates.html

Answer 3

TrustManager[] trustAllCerts = new TrustManager[] {new X509TrustManager() {
                    public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                        return null;
                    }
                    public void checkClientTrusted(X509Certificate[] certs, String authType) {
                    }
                    public void checkServerTrusted(X509Certificate[] certs, String authType) {
                    }
                }
            };
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, trustAllCerts, new java.security.SecureRandom());
            HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());

            HostnameVerifier allHostsValid = new HostnameVerifier() {
                public boolean verify(String hostname, SSLSession session) {
                    return true;
                }
            };
            HttpsURLConnection.setDefaultHostnameVerifier(allHostsValid);
            GetCustomerPhone http = new GetCustomerPhone(); 

    System.out.println("Processing..");     
     try{
            http.sendPost();    
        }
    catch(Exception e){
            e.printStackTrace();
        }               
}

我认为它会正常工作。因为我很好......