如何绕过 ssl 证书检查 java

Question

我想访问在远程虚拟机中托管 https 的 SOAP 网络服务 url。使用 HttpURLConnection 访问它时出现异常。

这是我的代码：

import javax.net.ssl.*;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

/**
 * Created by prasantabiswas on 07/03/17.
 */
public class Main
{
    public static void main(String [] args)
    {
        try
        {
            URL url = new URL("https://myhost:8913/myservice/service?wsdl");
            HttpURLConnection http = null;

            if (url.getProtocol().toLowerCase().equals("https")) {
                trustAllHosts();
                HttpsURLConnection https = (HttpsURLConnection) url.openConnection();
                https.setHostnameVerifier(DO_NOT_VERIFY);
                http = https;
            } else {
                http = (HttpURLConnection) url.openConnection();
            }
            String SOAPAction="";
//            http.setRequestProperty("Content-Length", String.valueOf(b.length));
            http.setRequestProperty("Content-Type", "text/xml; charset=utf-8");
            http.setRequestProperty("SOAPAction", SOAPAction);
            http.setRequestMethod("GET");
            http.setDoOutput(true);
            http.setDoInput(true);
            OutputStream out = http.getOutputStream();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

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

    private static void trustAllHosts() {
        // Create a trust manager that does not validate certificate chains
        TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
            public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                return new java.security.cert.X509Certificate[] {};
            }

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

            public void checkServerTrusted(X509Certificate[] chain,
                                           String authType) throws CertificateException {
            }
        } };

        // Install the all-trusting trust manager
        try {
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, trustAllCerts, new java.security.SecureRandom());
            HttpsURLConnection
                    .setDefaultSSLSocketFactory(sc.getSocketFactory());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

我遇到以下异常：

javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: Certificates does not conform to algorithm constraints
    at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
    at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1949)
    at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
    at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
    at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1509)
    at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
    at sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)
    at sun.security.ssl.Handshaker.process_record(Handshaker.java:914)
    at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
    at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
    at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1283)
    at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1258)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:250)
    at Main.main(Main.java:35)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.security.cert.CertificateException: Certificates does not conform to algorithm constraints
    at sun.security.ssl.AbstractTrustManagerWrapper.checkAlgorithmConstraints(SSLContextImpl.java:1055)
    at sun.security.ssl.AbstractTrustManagerWrapper.checkAdditionalTrust(SSLContextImpl.java:981)
    at sun.security.ssl.AbstractTrustManagerWrapper.checkServerTrusted(SSLContextImpl.java:923)
    at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1491)
    ... 18 more

尝试了与 google 搜索不同的解决方案，但没有一个有效。我想避免使用 keytool，因为我将运行在不同的虚拟机上进行测试。

有人对此有任何解决方案吗？

Answer 1

尝试使用 Apache HTTP 客户端，这对我有用。

SSLContextBuilder builder = new SSLContextBuilder();
builder.loadTrustMaterial(null, new TrustStrategy() {
     public boolean isTrusted(final X509Certificate[] chain, String authType) throws CertificateException {
          return true;
     }
});
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(builder.build());

CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();

// GET or POST request with the client
...

Answer 2

编辑： 在使用之前了解这会导致的漏洞。这决不推荐用于生产用途。

最好的方法是创建一个信任一切的虚拟信任管理器。

 TrustManager[] dummyTrustManager = 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) {
      }
    } };

然后使用虚拟信任管理器初始化 SSL 上下文

SSLContext sc = SSLContext.getInstance("SSL");
    sc.init(null, dummyTrustManager, new java.security.SecureRandom());

最后使用 SSLContext 打开连接

HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());

    URL url = new URL("https://myhost:8913/myservice/service?wsdl");

这个问题已经在这里得到更详细的回答 Java: Overriding function to disable SSL certificate check

更新：

以上问题是由于 Java 不支持证书签名算法。根据 this post，Java 8 的更高版本已禁用 md5 算法。

要启用 md5 支持，请在 /lib/security 下找到 java.security 文件并找到行 (535)

jdk.certpath.disabledAlgorithms=MD2, MD5, RSA keySize < 1024,

并删除 MD5

Answer 3

使用 X509ExtendedTrustManager 而不是 X509TrustManager() 解决了问题。这是示例：

public void trustAllHosts()
    {
        try
        {
            TrustManager[] trustAllCerts = new TrustManager[]{
                    new X509ExtendedTrustManager()
                    {
                        @Override
                        public java.security.cert.X509Certificate[] getAcceptedIssuers()
                        {
                            return null;
                        }

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

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

                        @Override
                        public void checkClientTrusted(java.security.cert.X509Certificate[] xcs, String string, Socket socket) throws CertificateException
                        {

                        }

                        @Override
                        public void checkServerTrusted(java.security.cert.X509Certificate[] xcs, String string, Socket socket) throws CertificateException
                        {

                        }

                        @Override
                        public void checkClientTrusted(java.security.cert.X509Certificate[] xcs, String string, SSLEngine ssle) throws CertificateException
                        {

                        }

                        @Override
                        public void checkServerTrusted(java.security.cert.X509Certificate[] xcs, String string, SSLEngine ssle) throws CertificateException
                        {

                        }

                    }
            };

            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, trustAllCerts, new java.security.SecureRandom());
            HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());

            // Create all-trusting host name verifier
            HostnameVerifier allHostsValid = new  HostnameVerifier()
            {
                @Override
                public boolean verify(String hostname, SSLSession session)
                {
                    return true;
                }
            };
            // Install the all-trusting host verifier
            HttpsURLConnection.setDefaultHostnameVerifier(allHostsValid);
        }
        catch (Exception e)
        {
            log.error("Error occurred",e);
        }
    }

Answer 4

不使用 HttpsURLConnection.setDefaultSSLSocketFactory 和您自己实现的 TrustManager 或 X509ExtendedTrustManager，您可以使用 TrustManagerFactory 和 KeyStore 以及颁发的证书您需要信任的证书（对于 self-signed 证书，这与主机证书相同）并在特定实例上调用 HttpsURLConnection.setSSLSocketFactory。这既减少了代码又避免了信任所有 HTTPS 证书的安全问题。

在main中：

            if (url.getProtocol().toLowerCase().equals("https")) {
                HttpsURLConnection https = (HttpsURLConnection) url.openConnection();
                https.setSSLSocketFactory(createSSLSocketFactory());
                http = https;
            }

方法 createSSLSocketFactory 如下所示：

    private static SSLSocketFactory createSSLSocketFactory() {
         File crtFile = new File("server.crt");
         Certificate certificate =          CertificateFactory.getInstance("X.509").generateCertificate(new FileInputStream(crtFile));

         KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
         keyStore.load(null, null);
         keyStore.setCertificateEntry("server", certificate);

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

         SSLContext sslContext = SSLContext.getInstance("TLS");
         sslContext.init(null, trustManagerFactory.getTrustManagers(), null);

         return sslContext.getSocketFactory();
    }

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