如何使用 Apache HttpClient 处理无效的 SSL 证书？

Question

我知道，关于这个问题有很多不同的问题和很多答案...但我无法理解...

我有： ubuntu-9.10-desktop-amd64 + NetBeans6.7.1 “按原样”安装。代表。 我需要通过 HTTPS 连接到某个网站。为此，我使用 Apache 的 HttpClient。

我从教程中读到：

“一旦正确安装了 JSSE，通过 SSL 的安全 HTTP 通信应该如下
简单如普通 HTTP 通信。” 举一些例子：

HttpClient httpclient = new HttpClient();
GetMethod httpget = new GetMethod("https://www.verisign.com/"); 
try { 
  httpclient.executeMethod(httpget);
  System.out.println(httpget.getStatusLine());
} finally {
  httpget.releaseConnection();
}

到目前为止，我写了这样的内容：

HttpClient client = new HttpClient();

HttpMethod get = new GetMethod("https://mms.nw.ru");
//get.setDoAuthentication(true);

try {
    int status = client.executeMethod(get);
    System.out.println(status);

    BufferedInputStream is = new BufferedInputStream(get.getResponseBodyAsStream());
    int r=0;byte[] buf = new byte[10];
    while((r = is.read(buf)) > 0) {
        System.out.write(buf,0,r);
    }

} catch(Exception ex) {
    ex.printStackTrace();
}

结果我遇到了一系列错误：

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
        at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
        at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1627)
        at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:204)
        at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:198)
        at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:994)
        at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:142)
        at sun.security.ssl.Handshaker.processLoop(Handshaker.java:533)
        at sun.security.ssl.Handshaker.process_record(Handshaker.java:471)
        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:904)
        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1132)
        at sun.security.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:643)
        at sun.security.ssl.AppOutputStream.write(AppOutputStream.java:78)
        at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
        at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
        at org.apache.commons.httpclient.HttpConnection.flushRequestOutputStream(HttpConnection.java:828)
        at org.apache.commons.httpclient.HttpMethodBase.writeRequest(HttpMethodBase.java:2116)
        at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1096)
        at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
        at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
        at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
        at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
        at simpleapachehttp.Main.main(Main.java:41)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
        at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:302)
        at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:205)
        at sun.security.validator.Validator.validate(Validator.java:235)
        at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:147)
        at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:230)
        at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:270)
        at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:973)
        ... 17 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
        at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:191)
        at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:255)
        at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:297)
        ... 23 more

我需要做什么来创建最简单的 SSL 连接？ （可能没有 KeyManager 和 Trust manager 等。）

Answer 1

https://mms.nw.ru 使用不在默认信任管理器集中的自签名证书。要解决此问题，请执行以下操作之一：

• 使用接受任何证书的 TrustManager 配置 SSLContext（请参见下文）。
• 使用包含您的证书的适当信任存储配置 SSLContext。
• 将该站点的证书添加到默认 Java 信任存储区。

下面是一个程序，它创建一个接受任何证书的（几乎没有价值的）SSL 上下文：

import java.net.URL;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.KeyManager;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

public class SSLTest {
    
    public static void main(String [] args) throws Exception {
        // configure the SSLContext with a TrustManager
        SSLContext ctx = SSLContext.getInstance("TLS");
        ctx.init(new KeyManager[0], new TrustManager[] {new DefaultTrustManager()}, new SecureRandom());
        SSLContext.setDefault(ctx);

        URL url = new URL("https://mms.nw.ru");
        HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
        conn.setHostnameVerifier(new HostnameVerifier() {
            @Override
            public boolean verify(String arg0, SSLSession arg1) {
                return true;
            }
        });
        System.out.println(conn.getResponseCode());
        conn.disconnect();
    }
    
    private static class DefaultTrustManager implements X509TrustManager {

        @Override
        public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {}

        @Override
        public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {}

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

Answer 2

https://mms.nw.ru 可能使用不是由证书颁发机构颁发的证书。因此，您需要将证书添加到受信任的 Java 密钥存储中，如无法找到有效的证书路径中所述到请求的目标：

在工作的客户端上工作时
运行启用 SSL 的服务器
https协议，你可能会得到错误
'无法找到有效的认证
请求目标的路径'如果
服务器证书不是由
认证机构，而是一个自我
由私人 CMS 签署或颁发。

别惊慌。您需要做的就是
将服务器证书添加到您的
如果您的客户端受信任的 Java 密钥存储
是用Java编写的。你可能是
想知道怎么好像无法访问
服务器所在的机器
安装。有一个简单的程序
可以帮助你。请下载 Java
程序并运行

% java InstallCert _web_site_hostname_

该程序打开了一个连接
指定的主机并启动了 SSL
握手。它打印了异常
发生的错误的堆栈跟踪
并显示您使用的证书
服务器。现在它会提示您添加
证书到您可信的密钥库。

如果您改变主意，请输入
'q'。如果你真的想添加
证书，输入“1”，或其他
添加其他证书的号码，
甚至是 CA 证书，但您通常
不想那样做。一旦你有
做出您的选择后，该程序将
显示完整的证书并
然后将其添加到名为的 Java KeyStore
当前的“jssecacerts”
目录。

要在您的程序中使用它，可以
配置 JSSE 以将其用作信任
将其存储或复制到您的
$JAVA_HOME/jre/lib/security 目录。
如果您希望所有 Java 应用程序
将证书视为可信
不仅是 JSSE，您还可以
覆盖其中的 cacerts 文件
目录。

毕竟，JSSE 将能够
完成与主人的握手，
您可以通过运行来验证
再次编程。

要了解更多详细信息，您可以查看
Leeland 的博客 否更多‘找不到’
请求的有效认证路径
目标'

Answer 3

除了 Pascal Thivent 的正确答案之外，另一种方法是从 Firefox 保存证书（查看证书 -> 详细信息 -> 导出）或 openssl s_client 并将其导入信任存储区。

仅当您有办法验证该证书时才应执行此操作。如果做不到这一点，请在第一次连接时执行此操作，如果证书在后续连接中意外更改，它至少会给您一个错误。

要将其导入到信任存储中，请使用：

keytool -importcert -keystore truststore.jks -file servercert.pem

默认情况下，默认信任存储应为 $JAVA_HOME/jre/lib/security/cacerts，其密码应为 changeit，请参阅 JSSE 参考指南了解详情。

如果您不想全局允许该证书，而仅允许这些连接使用该证书，则可以为其创建一个 SSLContext：

TrustManagerFactory tmf = TrustManagerFactory
    .getInstance(TrustManagerFactory.getDefaultAlgorithm());
KeyStore ks = KeyStore.getInstance("JKS");
FileInputStream fis = new FileInputStream("/.../truststore.jks");
ks.load(fis, null);
// or ks.load(fis, "thepassword".toCharArray());
fis.close();

tmf.init(ks);

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

然后，您需要通过以下方式为 Apache HTTP Client 3.x 设置它：实现一个，如果其 SecureProtocolSocketFactory 使用此SSLContext。 （此处有示例）。

Apache HTTP Client 4.x（除了最早的版本之外）直接支持传递 SSLContext。

Answer 4

对于 Apache HttpClient 4.5+ 和Java8：

SSLContext sslContext = SSLContexts.custom()
        .loadTrustMaterial((chain, authType) -> true).build();

SSLConnectionSocketFactory sslConnectionSocketFactory =
        new SSLConnectionSocketFactory(sslContext, new String[]
        {"SSLv2Hello", "SSLv3", "TLSv1","TLSv1.1", "TLSv1.2" }, null,
        NoopHostnameVerifier.INSTANCE);
CloseableHttpClient client = HttpClients.custom()
        .setSSLSocketFactory(sslConnectionSocketFactory)
        .build();

但是如果您的 HttpClient 使用 ConnectionManager 来寻求连接，例如这样：

 PoolingHttpClientConnectionManager connectionManager = new 
         PoolingHttpClientConnectionManager();

 CloseableHttpClient client = HttpClients.custom()
            .setConnectionManager(connectionManager)
            .build();

HttpClients.custom().setSSLSocketFactory(sslConnectionSocketFactory) 无效强>，问题没有解决。

因为HttpClient使用指定的connectionManager来寻求连接，而指定的connectionManager还没有注册我们自定义的SSLConnectionSocketFactory。要解决这个问题，应该在connectionManager 中注册定制的SSLConnectionSocketFactory。正确的代码应该是这样的：

PoolingHttpClientConnectionManager connectionManager = new 
    PoolingHttpClientConnectionManager(RegistryBuilder.
                <ConnectionSocketFactory>create()
      .register("http",PlainConnectionSocketFactory.getSocketFactory())
      .register("https", sslConnectionSocketFactory).build());

CloseableHttpClient client = HttpClients.custom()
            .setConnectionManager(connectionManager)
            .build();

Answer 5

Apache HttpClient 4.5 方式：

org.apache.http.ssl.SSLContextBuilder sslContextBuilder = SSLContextBuilder.create();
sslContextBuilder.loadTrustMaterial(new org.apache.http.conn.ssl.TrustSelfSignedStrategy());
SSLContext sslContext = sslContextBuilder.build();
org.apache.http.conn.ssl.SSLConnectionSocketFactory sslSocketFactory =
        new SSLConnectionSocketFactory(sslContext, new org.apache.http.conn.ssl.DefaultHostnameVerifier());

HttpClientBuilder httpClientBuilder = HttpClients.custom().setSSLSocketFactory(sslSocketFactory);
httpClient = httpClientBuilder.build();

注意：org.apache.http.conn.ssl.SSLContextBuilder 已弃用，org.apache.http.ssl.SSLContextBuilder code> 是新的（请注意后者的包名称中缺少 conn）。

Answer 6

来自 http://hc.apache.org/httpclient-3.x/sslguide.html：

Protocol.registerProtocol("https", 
new Protocol("https", new MySSLSocketFactory(), 443));
HttpClient httpclient = new HttpClient();
GetMethod httpget = new GetMethod("https://www.whatever.com/");
try {
  httpclient.executeMethod(httpget);
      System.out.println(httpget.getStatusLine());
} finally {
      httpget.releaseConnection();
}

可以在其中找到 MySSLSocketFactory 示例

Answer 7

想要将答案粘贴到此处：

在 Apache HttpClient 4.5.5

Apache客户端4.5.5如何处理无效的SSL证书？

HttpClient httpClient = HttpClients
            .custom()
            .setSSLContext(new SSLContextBuilder().loadTrustMaterial(null, TrustAllStrategy.INSTANCE).build())
            .setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE)
            .build();

Answer 8

一旦您拥有了 Java 证书存储（通过使用上面创建的 great InstallCert 类），您就可以通过在 java 启动时传递“javax.net.ssl.trustStore”参数来让 java 使用它。

前任：

java -Djavax.net.ssl.trustStore=/path/to/jssecacerts MyClassName

Answer 9

使用自签名测试证书可能会遇到的另一个问题是：

java.io.IOException: HTTPS 主机名错误: 应该是...

当您尝试访问 HTTPS url 时会发生此错误。您可能已将服务器证书安装到 JRE 的密钥库中。但此错误意味着服务器证书的名称与 URL 中提到的服务器的实际域名不匹配。当您使用非 CA 颁发的证书时，通常会发生这种情况。

此示例演示如何编写忽略证书服务器名称的 HttpsURLConnection DefaultHostnameVerifier：

http:// /www.java-samples.com/showtutorial.php?tutorialid=211

Answer 10

要轻松添加运行时信任的主机而不放弃所有检查，请尝试使用此处的代码：http://code.google.com/p/self-signed-cert-trust-manager/。

Answer 11

EasySSLProtocolSocketFactory 给我带来了问题，所以我最终实现了自己的 ProtocolSocketFactory。

首先你需要注册它：

Protocol.registerProtocol("https", new Protocol("https", new TrustAllSSLSocketFactory(), 443));

HttpClient client = new HttpClient();
...

然后实现 ProtocolSocketFactory：

class TrustAllSSLSocketFactory implements ProtocolSocketFactory {

    public static final TrustManager[] TRUST_ALL_CERTS = new TrustManager[]{
        new X509TrustManager() {
            public void checkClientTrusted(final X509Certificate[] certs, final String authType) {

            }

            public void checkServerTrusted(final X509Certificate[] certs, final String authType) {

            }

            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        }
    };

    private TrustManager[] getTrustManager() {
        return TRUST_ALL_CERTS;
    }

    public Socket createSocket(final String host, final int port, final InetAddress clientHost,
                               final int clientPort) throws IOException {
        return getSocketFactory().createSocket(host, port, clientHost, clientPort);
    }

    @Override
    public Socket createSocket(final String host, final int port, final InetAddress localAddress,
                               final int localPort, final HttpConnectionParams params) throws IOException {
        return createSocket(host, port);
    }

    public Socket createSocket(final String host, final int port) throws IOException {
        return getSocketFactory().createSocket(host, port);
    }

    private SocketFactory getSocketFactory() throws UnknownHostException {
        TrustManager[] trustAllCerts = getTrustManager();

        try {
            SSLContext context = SSLContext.getInstance("SSL");
            context.init(null, trustAllCerts, new SecureRandom());

            final SSLSocketFactory socketFactory = context.getSocketFactory();
            HttpsURLConnection.setDefaultSSLSocketFactory(socketFactory);
            return socketFactory;
        } catch (NoSuchAlgorithmException | KeyManagementException exception) {
            throw new UnknownHostException(exception.getMessage());
        }
    }
}

注意：这是使用 HttpClient 3.1 和 Java 8

Answer 12

我碰巧遇到了同样的问题，突然之间我的所有进口都丢失了。我尝试删除 .m2 文件夹中的所有内容。并尝试重新导入所有内容，但仍然没有任何效果。
最后，我打开了 IDE 抱怨无法在浏览器中下载的网站。并看到它正在使用的证书，并在我

$ keytool -v -list  PATH_TO_JAVA_KEYSTORE

的密钥库路径中看到 /Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/security/cacerts

特定证书不存在。

因此，您所要做的就是再次将证书放入 JAVA JVM 密钥库中。
可以使用以下命令来完成。

$ keytool -import -alias ANY_NAME_YOU_WANT_TO_GIVE -file PATH_TO_YOUR_CERTIFICATE -keystore PATH_OF_JAVA_KEYSTORE

如果要求输入密码，请尝试使用默认密码“changeit”
如果运行上述命令时出现权限错误。
在 Windows 中以管理模式打开它。
在 mac 和 unix 中使用 sudo。

成功添加密钥后，
您可以使用以下命令查看它：

$ keytool -v -list  /Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/security/cacerts 

您可以使用 teh 命令仅查看 SHA-1

$ keytool -list  /Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/security/cacerts 

Answer 13

此链接 逐步解释您的要求。如果您并不真正关心哪个证书，您可以继续执行以下链接中的过程。

注意您可能需要仔细检查您正在执行的操作，因为这是不安全的操作。

Answer 14

对于 HttpClient，我们可以这样做：

SSLContext ctx = SSLContext.getInstance("TLS");
        ctx.init(new KeyManager[0], new TrustManager[] {new DefaultTrustManager()}, new SecureRandom());
        SSLContext.setDefault(ctx);

        String uri = new StringBuilder("url").toString();

        HostnameVerifier hostnameVerifier = new HostnameVerifier() {
            @Override
            public boolean verify(String arg0, SSLSession arg1) {
                return true;
            }
        };

        HttpClient client = HttpClientBuilder.create().setSSLContext(ctx)
                .setSSLHostnameVerifier(hostnameVerifier).build()

Answer 15

按照下面针对 Java 1.7 给出的说明，使用 InstallCert.java 程序文件创建 SSL 证书。

https://github.com/escline/InstallCert

您必须重新启动 tomcat

Answer 16

将以下内容与 DefaultTrustManager 一起使用，它像魅力一样在 httpclient 中工作。非常感谢！！ @Kevin 和其他所有贡献者

    SSLContext ctx = null;
    SSLConnectionSocketFactory sslsf = null;
    try {

        ctx = SSLContext.getInstance("TLS");
        ctx.init(new KeyManager[0], new TrustManager[] {new DefaultTrustManager()}, new SecureRandom());
        SSLContext.setDefault(ctx);

        sslsf = new SSLConnectionSocketFactory(
                ctx,
                new String[] { "TLSv1" },
                null,
                SSLConnectionSocketFactory.getDefaultHostnameVerifier());

    } catch (Exception e) {
        e.printStackTrace();
    }

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

Answer 17

我正在使用 httpclient 3.1.X ，这对我有用

        try {
        SSLContext sslContext = SSLContext.getInstance("TLS");
        TrustManager trustManager = new X509TrustManager() {
            @Override
            public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
            }

            @Override
            public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {

            }

            @Override
            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        };
        sslContext.init(null, new TrustManager[]{trustManager}, null);
        SslContextSecureProtocolSocketFactory socketFactory = new SslContextSecureProtocolSocketFactory(sslContext,false);
        Protocol.registerProtocol("https", new Protocol("https", (ProtocolSocketFactory) socketFactory, 443));//同样会影响到HttpUtils
    } catch (Throwable e) {
        e.printStackTrace();

}

public class SslContextSecureProtocolSocketFactory implements      SecureProtocolSocketFactory {

private SSLContext sslContext;
private boolean verifyHostname;

public SslContextSecureProtocolSocketFactory(SSLContext sslContext, boolean verifyHostname) {
    this.verifyHostname = true;
    this.sslContext = sslContext;
    this.verifyHostname = verifyHostname;
}

public SslContextSecureProtocolSocketFactory(SSLContext sslContext) {
    this(sslContext, true);
}

public SslContextSecureProtocolSocketFactory(boolean verifyHostname) {
    this((SSLContext)null, verifyHostname);
}

public SslContextSecureProtocolSocketFactory() {
    this((SSLContext)null, true);
}

public synchronized void setHostnameVerification(boolean verifyHostname) {
    this.verifyHostname = verifyHostname;
}

public synchronized boolean getHostnameVerification() {
    return this.verifyHostname;
}

public Socket createSocket(String host, int port, InetAddress clientHost, int clientPort) throws IOException, UnknownHostException {
    SSLSocketFactory sf = this.getSslSocketFactory();
    SSLSocket sslSocket = (SSLSocket)sf.createSocket(host, port, clientHost, clientPort);
    this.verifyHostname(sslSocket);
    return sslSocket;
}

public Socket createSocket(String host, int port, InetAddress localAddress, int localPort, HttpConnectionParams params) throws IOException, UnknownHostException, ConnectTimeoutException {
    if(params == null) {
        throw new IllegalArgumentException("Parameters may not be null");
    } else {
        int timeout = params.getConnectionTimeout();
        Socket socket = null;
        SSLSocketFactory socketfactory = this.getSslSocketFactory();
        if(timeout == 0) {
            socket = socketfactory.createSocket(host, port, localAddress, localPort);
        } else {
            socket = socketfactory.createSocket();
            InetSocketAddress localaddr = new InetSocketAddress(localAddress, localPort);
            InetSocketAddress remoteaddr = new InetSocketAddress(host, port);
            socket.bind(localaddr);
            socket.connect(remoteaddr, timeout);
        }

        this.verifyHostname((SSLSocket)socket);
        return socket;
    }
}

public Socket createSocket(String host, int port) throws IOException, UnknownHostException {
    SSLSocketFactory sf = this.getSslSocketFactory();
    SSLSocket sslSocket = (SSLSocket)sf.createSocket(host, port);
    this.verifyHostname(sslSocket);
    return sslSocket;
}

public Socket createSocket(Socket socket, String host, int port, boolean autoClose) throws IOException, UnknownHostException {
    SSLSocketFactory sf = this.getSslSocketFactory();
    SSLSocket sslSocket = (SSLSocket)sf.createSocket(socket, host, port, autoClose);
    this.verifyHostname(sslSocket);
    return sslSocket;
}

private void verifyHostname(SSLSocket socket) throws SSLPeerUnverifiedException, UnknownHostException {
    synchronized(this) {
        if(!this.verifyHostname) {
            return;
        }
    }

    SSLSession session = socket.getSession();
    String hostname = session.getPeerHost();

    try {
        InetAddress.getByName(hostname);
    } catch (UnknownHostException var10) {
        throw new UnknownHostException("Could not resolve SSL sessions server hostname: " + hostname);
    }

    X509Certificate[] certs = (X509Certificate[])((X509Certificate[])session.getPeerCertificates());
    if(certs != null && certs.length != 0) {
        X500Principal subjectDN = certs[0].getSubjectX500Principal();
        List cns = this.getCNs(subjectDN);
        boolean foundHostName = false;
        Iterator i$ = cns.iterator();
        AntPathMatcher matcher  = new AntPathMatcher();
        while(i$.hasNext()) {
            String cn = (String)i$.next();
            if(matcher.match(cn.toLowerCase(),hostname.toLowerCase())) {
                foundHostName = true;
                break;
            }
        }

        if(!foundHostName) {
            throw new SSLPeerUnverifiedException("HTTPS hostname invalid: expected \'" + hostname + "\', received \'" + cns + "\'");
        }
    } else {
        throw new SSLPeerUnverifiedException("No server certificates found!");
    }
}

private List<String> getCNs(X500Principal subjectDN) {
    ArrayList cns = new ArrayList();
    StringTokenizer st = new StringTokenizer(subjectDN.getName(), ",");

    while(st.hasMoreTokens()) {
        String cnField = st.nextToken();
        if(cnField.startsWith("CN=")) {
            cns.add(cnField.substring(3));
        }
    }

    return cns;
}

protected SSLSocketFactory getSslSocketFactory() {
    SSLSocketFactory sslSocketFactory = null;
    synchronized(this) {
        if(this.sslContext != null) {
            sslSocketFactory = this.sslContext.getSocketFactory();
        }
    }

    if(sslSocketFactory == null) {
        sslSocketFactory = (SSLSocketFactory)SSLSocketFactory.getDefault();
    }

    return sslSocketFactory;
}

public synchronized void setSSLContext(SSLContext sslContext) {
    this.sslContext = sslContext;
}

}