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。 使用SsLHandshakeException获得连接时失败。

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：

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

我不知道有什么方法可以规避Java所需的SSL安全性，但我认为您应该重新考虑“我绝对不想使用keytool导入密钥”的立场。 问题不在于您是否信任服务器。 重要的问题是：

1. 您希望与服务器进行纯文本通信。 有多少人可以听呢？ 如果您的客户端在局域网内运行，则只有同一公司的每个人都可以监视您。 如果您离开受保护的网络，则未知人数的人会突然看着您在做什么。
2. 如果在客户端中禁用SSL，服务器应如何确保命令来自您？ 没有SSL，某人可能会劫持您的通信并控制服务器。
3. 没有SSL，密码将以纯文本格式传输。 一个电视台最近发现 ，在接受采访时在墙上贴上带有密码的便条在2015年并不是明智之举。

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

Answer 2

客户端连接到我信任的服务器。

你怎么知道的？ 证书验证的整个目的是确保您确实连接到想要的服务器，而不是中间人。

Answer 3

尝试将其放在代码之前

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);
}