如何为Java服务器提供多个SSL证书 [英] How can I have multiple SSL certificates for a Java server

问题描述

我有一个用Java编写的内部HTTP服务器;完整的源代码在我的处置。 HTTP服务器可以配置任何数量的网站，每个网站将有一个单独的侦听套接字创建：

I have an in-house HTTP server written in Java; full source code at my disposal. The HTTP server can configure any number of web sites, each of which will have a separate listen socket created with:

skt=SSLServerSocketFactory.getDefault().createServerSocket(prt,bcklog,adr);

使用用Java keytool创建的标准密钥存储区，我不能为我的生活以获取与不同侦听套接字相关联的不同证书，以便每个配置的网站都有自己的证书。

Using a standard key store created with the Java keytool, I cannot for the life of me work out how to get different certificates associated with different listen sockets so that each configured web site has it's own certificate.

我现在在一个时间捏，所以一些代码示例说明将最感谢。但我同样喜欢关于JSSE在这方面如何结合的很好的概述（我搜索了Sun的JSSE doco，直到我的大脑疼痛（字面意思，虽然它可能是咖啡因戒断）。

I'm in a time pinch for this now, so some code samples that illustrate would be most appreciated. But as much I would appreciate any good overview on how JSSE hangs together in this regard (I have searched Sun's JSSE doco until my brain hurts (literally; though it might be as much caffeine withdrawal)).

编辑

没有简单的方法可以使用别名将密钥库中的服务器证书与听套接字？这样：

Is there no simple way to use the alias to associate the server certificates in a key store with the listen sockets? So that:

• 客户有一个密钥存储区可以管理所有证书，

我得到的印象（今天下午），我可以写一个简单的KeyManager，只有 chooseServerAlias（...）返回非空，这是我想要的别名的名称 - 任何人都有这个推理的想法？

I was getting the impression (earlier this afternoon) that I could write a simple KeyManager, with only chooseServerAlias(...) returning non-null, that being the name of the alias I wanted - anyone have any thoughts on that line of reasoning?

解决方案

我使用的解决方案是从 slyvarking 的答案是创建一个临时密钥存储，并用从单一外部密钥存储中提取的所需密钥/ cert填充它。任何有兴趣的人都可以使用代码（svrctfals是我的服务器证书别名值）：

The solution I used, built from slyvarking's answer was to create a temporary key store and populate it with the desired key/cert extracted from the singular external key store. Code follows for any who are interested (svrctfals is my "server certificate alias" value):

    SSLServerSocketFactory              ssf;                                    // server socket factory
    SSLServerSocket                     skt;                                    // server socket

    // LOAD EXTERNAL KEY STORE
    KeyStore mstkst;
    try {
        String   kstfil=GlobalSettings.getString("javax.net.ssl.keyStore"        ,System.getProperty("javax.net.ssl.keyStore"        ,""));
        String   ksttyp=GlobalSettings.getString("javax.net.ssl.keyStoreType"    ,System.getProperty("javax.net.ssl.keyStoreType"    ,"jks"));
        char[]   kstpwd=GlobalSettings.getString("javax.net.ssl.keyStorePassword",System.getProperty("javax.net.ssl.keyStorePassword","")).toCharArray();

        mstkst=KeyStore.getInstance(ksttyp);
        mstkst.load(new FileInputStream(kstfil),kstpwd);
        }
    catch(java.security.GeneralSecurityException thr) {
        throw new IOException("Cannot load keystore ("+thr+")");
        }

    // CREATE EPHEMERAL KEYSTORE FOR THIS SOCKET USING DESIRED CERTIFICATE
    try {
        SSLContext        ctx=SSLContext.getInstance("TLS");
        KeyManagerFactory kmf=KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
        KeyStore          sktkst;
        char[]            blkpwd=new char[0];

        sktkst=KeyStore.getInstance("jks");
        sktkst.load(null,blkpwd);
        sktkst.setKeyEntry(svrctfals,mstkst.getKey(svrctfals,blkpwd),blkpwd,mstkst.getCertificateChain(svrctfals));
        kmf.init(sktkst,blkpwd);
        ctx.init(kmf.getKeyManagers(),null,null);
        ssf=ctx.getServerSocketFactory();
        }
    catch(java.security.GeneralSecurityException thr) {
        throw new IOException("Cannot create secure socket ("+thr+")");
        }

    // CREATE AND INITIALIZE SERVER SOCKET
    skt=(SSLServerSocket)ssf.createServerSocket(prt,bcklog,adr);
    ...
    return skt;

推荐答案

最简单的方法是使用一个所有域名的证书。将所有其他网站名称在SAN中（主题备用名称）。

The easiest way to do this is to use a single certificate for all your domain names. Put all other site names in SAN (Subject Alternative Name).

如果每个域名都需要一个证书，则可以编写自己的密钥管理器，域，以便您可以使用单个密钥库。在我们的系统中，我们规定密钥库别名总是等于证书中的CN。所以我们可以这样做，

If you prefer one certificate for each domain name, you can write your own key manager and use alias to identify the domain so you can use a single keystore. In our system, we make a convention that keystore alias always equals the CN in the certificate. So we can do something like this,

SSLContext sctx1 = SSLContext.getInstance("SSLv3");
sctx1.init(new X509KeyManager[] { 
    new MyKeyManager("/config/master.jks","changeme".toCharArray(),"site1.example.com")
    },null, null);
SSLServerSocketFactory ssf = (SSLServerSocketFactory) sctx1.getServerSocketFactory();
ServerSocket ss1 = ssf.createServerSocket(1234);

...

SSLContext sctx2 = SSLContext.getInstance("SSLv3");
sctx2.init(new X509KeyManager[] { 
    new MyKeyManager("/config/master.jks","changeme".toCharArray(),"site2.example.com") 
    },null, null);
ssf = (SSLServerSocketFactory) sctx2.getServerSocketFactory();
ServerSocket ss2 = ssf.createServerSocket(5678);

...

public static class MyKeyManager implements X509KeyManager {
    private KeyStore keyStore;
    private String alias;
    private char[] password;

    MyKeyManager(String keyStoreFile, char[] password, String alias)
        throws IOException, GeneralSecurityException
    {
        this.alias = alias;
        this.password = password;
        InputStream stream = new FileInputStream(keyStoreFile);
        keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
        keyStore.load(stream, password);
    }

    public PrivateKey getPrivateKey(String alias) {
        try {
            return (PrivateKey) keyStore.getKey(alias, password);
        } catch (Exception e) {
            return null;
        }
    }

    public X509Certificate[] getCertificateChain(String alias) {
        try {
            java.security.cert.Certificate[] certs = keyStore.getCertificateChain(alias);
            if (certs == null || certs.length == 0)
                return null;
            X509Certificate[] x509 = new X509Certificate[certs.length];
            for (int i = 0; i < certs.length; i++)
                x509[i] = (X509Certificate)certs[i];
            return x509;
        } catch (Exception e) {
            return null;
        }          
    }

    public String chooseServerAlias(String keyType, Principal[] issuers,
                                    Socket socket) {
        return alias;
    }

    public String[] getClientAliases(String parm1, Principal[] parm2) {
        throw new UnsupportedOperationException("Method getClientAliases() not yet implemented.");
    }

    public String chooseClientAlias(String keyTypes[], Principal[] issuers, Socket socket) {
        throw new UnsupportedOperationException("Method chooseClientAlias() not yet implemented.");
    }

    public String[] getServerAliases(String parm1, Principal[] parm2) {
        return new String[] { alias };
    }

    public String chooseServerAlias(String parm1, Principal[] parm2) {
        return alias;
    }
}

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