Mit Java SID des angemeldeten Benutzers auslesen und in Variable schreiben

com.sun.security.auth.module.NTSystem ntsys = new com.sun.security.auth.module.NTSystem();
String sid = ntsys.getUserSID();
System.out.println(sid);

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;

public class searchSIDViaLDAP {
    public static void main(String args) {
        String SID = GetADUserSID("Administrator@domain.tld","Passw0rd","dc01.domain.tld","DC=domain,DC=tld","maxmuster");  
        System.out.println(SID);
    }

    public static String GetADUserSID(String username,String password,String DC,String DomainDN,String strSearchUser){
        Properties properties = new Properties();
        DirContext dirContext;
        SearchControls searchCtls = new SearchControls();
        searchCtls.setSearchScope(SearchControls.SUBTREE_SCOPE);
        searchCtls.setReturningAttributes(new String{"objectSid"});  
        String sFilter = "(&(objectCategory=Person)(objectClass=User)(sAMAccountname=" + strSearchUser + "))";  
        properties.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");  
        properties.put(Context.PROVIDER_URL, "LDAP://" + DC);  
        properties.put(Context.SECURITY_PRINCIPAL, username);
        properties.put(Context.SECURITY_CREDENTIALS, password);
        properties.put("java.naming.ldap.attributes.binary", "objectSid");  
        try {
            dirContext = new InitialDirContext(properties);
            NamingEnumeration<SearchResult> result = dirContext.search(DomainDN,sFilter,searchCtls);
            if (result.hasMore()){
                byte bSID = (byte)result.next().getAttributes().get("objectSID").get();  
                return convertSidToStr(bSID);
            }
            dirContext.close();
        } catch (NamingException e) {
            System.out.println("Error:" + e.getMessage());  
            return "";  
        }
        return "";  
    }
    public static String convertSidToStr(byte sid) {
        if (sid==null) return null;
        if (sid.length<8 || sid.length % 4 != 0) return "";  
        StringBuilder sb = new StringBuilder();
        sb.append("S-").append(sid);  
        int c = sid[1];
        ByteBuffer bb = ByteBuffer.wrap(sid);
        sb.append("-").append((long)bb.getLong() & 0XFFFFFFFFFFFFL);  
        bb.order(ByteOrder.LITTLE_ENDIAN);
        for (int i=0; i<c; i++) {
            sb.append("-").append((long)bb.getInt() & 0xFFFFFFFFL);  
        }
        return sb.toString();
    }
}