Re: probing SSL websites

From:
=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 17 Jan 2013 19:43:23 -0500
Message-ID:
<50f89aad$0$292$14726298@news.sunsite.dk>
On 1/17/2013 8:09 AM, Roedy Green wrote:

Is there an easy way to find out the certificate details of the SSL
cert a site is using, in particular what root certs you need for it to
be recognised?


The following may reveal somnething:

import java.io.IOException;
import java.net.URL;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;

import javax.net.ssl.HttpsURLConnection;

public class CertSniff {
    public static void dump(String urlstr) throws NoSuchAlgorithmException,
KeyManagementException, IOException {
      System.out.println("URL=" + urlstr);
         URL url = new URL(urlstr);
         HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
         if (con.getResponseCode() == HttpsURLConnection.HTTP_OK) {
             for(Certificate cert : con.getServerCertificates()) {
              if(cert instanceof X509Certificate) {
              X509Certificate cert509 = (X509Certificate)cert;
              System.out.println("Subject = " + cert509.getSubjectDN());
              System.out.println("Issuer = " + cert509.getIssuerDN());
              } else {
              System.out.println("Unknown certificate");
              }
             }
         } else {
          System.out.println("Connection problem");
         }
         con.disconnect();

    }
    public static void main(String[] args) throws Exception {
        dump("https://www.google.com/");
        dump("https://www.facebook.com/");
        dump("https://www.microsoft.com/");
    }
}

Arne

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