在Java中针对CA验证X.509证书 [英] Validate X.509 certificate against CA in Java

问题描述

假设我有这样的东西（客户端代码）：

Lets say I have something like this (client side code):

TrustManager[] trustAllCerts = new TrustManager[]{
    new X509TrustManager() {

        @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) {
        }
    }
};

SSLContext sslc = SSLContext.getInstance("TLS");
sslc.init(null, trustAllCerts, null);

SocketFactory sf = sslc.getSocketFactory();
SSLSocket s = (SSLSocket) sf.createSocket("127.0.0.1", 9124);

此代码功能齐全，但我真的无法弄清楚，如何验证服务器的证书对一个我在pem文件中提供的具体CA证书。

This code is complete functional, but I really can not figure out, how to validate server's certificate against one concrete CA certificate that I have available in pem file.

所有证书都由我的自签名CA签名，而且我需要验证的CA（仅针对此证书）。

All certificates are signed by my self-signed CA, and it is the CA I need to validate against (only against this one).

感谢所有答案。

编辑：

回应 jglouie （非常感谢你这样做 - 无法对你的答案进行投票。）

In response to jglouie (thank you very much this way - can not vote up your answer).

我创立了解决方案：

new X509TrustManager() {

        @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)
                throws CertificateException {
            InputStream inStream = null;
            try {
                // Loading the CA cert
                URL u = getClass().getResource("tcp/cacert.pem");
                inStream = new FileInputStream(u.getFile());
                CertificateFactory cf = CertificateFactory.getInstance("X.509");
                X509Certificate ca = (X509Certificate) cf.generateCertificate(inStream);
                inStream.close();

                for (X509Certificate cert : certs) {
                    // Verifing by public key
                    cert.verify(ca.getPublicKey());
                }
            } catch (Exception ex) {
                Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex);
            } finally {
                try {
                    inStream.close();
                } catch (IOException ex) {
                    Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex);
                }
            }

        }
    }
};

推荐答案

我假设您的CA的自签名证书已按如下方式加载：

I assume that the self-signed certificate of your CA is already loaded as follows:

CertificateFactory cf = CertificateFactory.getInstance("X.509");   
FileInputStream finStream = new FileInputStream("CACertificate.pem"); 
X509Certificate caCertificate = (X509Certificate)cf.generateCertificate(finStream);  

然后在检查证书的方法中：

Then in the method to check certificate:

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

 if (certs == null || certs.length == 0) {  
      throw new IllegalArgumentException("null or zero-length certificate chain");  
 }  

 if (authType == null || authType.length() == 0) {  
            throw new IllegalArgumentException("null or zero-length authentication type");  
  }  

   //Check if certificate send is your CA's
    if(!certs[0].equals(caCertificate)){
         try
         {   //Not your CA's. Check if it has been signed by your CA
             certs[0].verify(caCertificate.getPublicKey())
         }
         catch(Exception e){   
              throw new CertificateException("Certificate not trusted",e);
         }
    }
    //If we end here certificate is trusted. Check if it has expired.  
     try{
          certs[0].checkValidity();
      }
      catch(Exception e){
            throw new CertificateException("Certificate not trusted. It has expired",e);
      }  
}

免责声明：没有甚至试图编译代码

Disclaimer: Have not even atempted to compile the code

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