General ECM Questions

Retrieve all users in LDAP Group

  • LDAP
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FunMaster

import java.util.Hashtable;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;

public class LdapGroupUserFetcher {

    static String baseDN = "DC=Company,DC=internal";
    private static DirContext directoryContext = null;

    private static DirContext initializeLdapContext() throws Exception {
        Properties config = new Properties();
        config.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
        config.put(Context.PROVIDER_URL, "ldap://localhost:389");
        config.put(Context.SECURITY_AUTHENTICATION, "simple");
        config.put(Context.SECURITY_PRINCIPAL, "CN=UserName");
        config.put(Context.SECURITY_CREDENTIALS, "Password");
        return new InitialDirContext(config);
    }

    public void fetchUsersInGroup(String base, String filter, String[] attributesToReturn, int limit) {
        Hashtable<String, String> foundUsers = new Hashtable<>();
        try {
            SearchControls searchControls = new SearchControls();
            searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE);
            searchControls.setReturningAttributes(attributesToReturn);
            directoryContext = initializeLdapContext();

            try {
                System.out.println("Using Base DN: " + base);
                System.out.println("Search Criteria: " + filter);
                NamingEnumeration<SearchResult> results = directoryContext.search(base, filter, searchControls);

                if (!results.hasMore()) {
                    System.out.println("No entries found matching filter: " + filter);
                }

                int counter = 0;
                while (results.hasMore()) {
                    if (counter >= limit) break;

                    SearchResult result = results.next();
                    Attributes attributes = result.getAttributes();

                    if (attributes == null || attributes.size() == 0) {
                        System.out.println("No attributes found for: " + attributesToReturn[0]);
                        continue;
                    }

                    try {
                        for (NamingEnumeration<? extends Attribute> allAttrs = attributes.getAll(); allAttrs.hasMore();) {
                            Attribute attr = allAttrs.next();
                            String attrID = attr.getID();
                            for (NamingEnumeration<?> values = attr.getAll(); values.hasMore();) {
                                String value = (String) values.next();
                                if ("member".equalsIgnoreCase(attrID)) {
                                    System.out.println("User member: " + value);
                                } else {
                                    System.out.println("Non-member attribute: " + attrID + " -> " + value);
                                }
                            }
                        }
                    } catch (NamingException e) {
                        System.err.println("Error processing attributes: " + e.getMessage());
                    }

                    counter++;
                }

            } catch (NamingException searchError) {
                System.err.println("Directory search failed: " + searchError.getMessage());
            }

            directoryContext.close();
            directoryContext = null;

        } catch (Exception e) {
            System.err.println("Error retrieving group members from LDAP: " + e.getMessage());
        }
    }

    public static void main(String[] args) throws Exception {
        LdapGroupUserFetcher fetcher = new LdapGroupUserFetcher();
        String[] attrs = {"cn", "member", "name"};
        String groupFilter = "CN=GroupName";
        fetcher.fetchUsersInGroup(baseDN, groupFilter, attrs, 2000);
    }
}

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