如何在自定义JMX客户端中忽略SSL证书

Question

我想编写一个自定义的JMX客户端。客户端连接到我信任的服务器。我绝对不想使用keytool导入密钥。获取与SsLHandshakeException的连接失败。

String username = "admin";
String password = "admin";
String[] credentials = new String[] { username, password };
Map<String, Object> env = new HashMap<>();
env.put(JMXConnector.CREDENTIALS, credentials);
// Only required for SSL Connections
env.put("com.sun.jndi.rmi.factory.socket", new SslRMIClientSocketFactory());
// MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://trustedhost:10010/jmxrmi");
JMXConnector jmxc = JMXConnectorFactory.connect(url, env);

我得到的异常是：

Exception in thread "main" java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is: 
    javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake]
    at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:369)
    at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:270)
    at my.monitor.TestMbean.main(TestMbean.java:32)
Caused by: javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is: 
    javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake]
    at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:122)
    at com.sun.jndi.toolkit.url.GenericURLContext.lookup(GenericURLContext.java:205)
    at javax.naming.InitialContext.lookup(InitialContext.java:417)
    at javax.management.remote.rmi.RMIConnector.findRMIServerJNDI(RMIConnector.java:1957)
    at javax.management.remote.rmi.RMIConnector.findRMIServer(RMIConnector.java:1924)
    at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:287)
    ... 2 more
Caused by: java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is: 
    javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
    at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:304)
    at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
    at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:342)
    at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
    at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:118)
    ... 7 more
Caused by: javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
    at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:980)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1363)
    at sun.security.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:735)
    at sun.security.ssl.AppOutputStream.write(AppOutputStream.java:123)
    at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
    at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
    at java.io.DataOutputStream.flush(DataOutputStream.java:123)
    at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:229)
    ... 11 more
Caused by: java.io.EOFException: SSL peer shut down incorrectly
    at sun.security.ssl.InputRecord.read(InputRecord.java:505)
    at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:961)
    ... 18 more

Answer 1

客户端连接到我信任的服务器。

怎么又知道了？证书验证的全部目的是确保您实际连接到您想要的服务器，而不是连接到某个中间人。

Answer 2

我不知道有什么方法可以绕过Java所要求的SSL安全性，但我认为您应该重新考虑您对“我绝对不想使用keytool导入密钥”的立场。问题不在于你是否信任服务器。重要的问题是：

1. 您希望与服务器进行纯文本通信。有多少人能够收听这个节目？如果您的客户端在本地网络内运行，则只有同一公司中的每个人都能够监视您。如果您离开受保护的网络，未知数量的人可能会突然监视您正在做的事情。
2. 如果您在客户端禁用SSL，服务器应该如何确保命令来自您？如果没有SSL，有人可以劫持您的通信并控制server.
3. Without SSL，密码将以明文传输。

表示，在2015年接受采访时，在墙上贴上密码并不是明智之举。

因此，正确的问题应该是:如何正确地设置SSL以保护JMX？请参阅http://docs.oracle.com/javase/8/docs/technotes/guides/management/agent.html搜索“使用SSL”。

Answer 3

试着把这个放在你的代码之前

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) {
    }
}
};

try {
    logger.info("Hacking SSL Validation");
    SSLContext sc = SSLContext.getInstance("SSL");
    sc.init(null, trustAllCerts, new java.security.SecureRandom());
    SSLContext.setDefault(sc);
    logger.info("SSL Validation hacked");
} catch (Exception e) {
    throw new RuntimeException(e);
}