LDAP search

HOWTO

• https://devconnected.com/how-to-search-ldap-using-ldapsearch-examples/
• https://www.forumsys.com/tutorials/integration-how-to/ldap/online-ldap-test-server/ 
• https://gist.github.com/bbuecherl/9431c03c71e5780fb328
  

LDAP test server

LDAP Server Information (read-only access):

Server: ldap.forumsys.com  
Port: 389

Bind DN: cn=read-only-admin,dc=example,dc=com
Bind Password: password

All user passwords are password.

 Search using test  server

[dave@dave git]$ ldapsearch -W -h ldap.forumsys.com -D "cn=read-only-admin,dc=example,dc=com" -b "dc=example,dc=com""uid=Newton"
Enter LDAP Password: 
# extended LDIF
#
# LDAPv3
# base <dc=example,dc=com> with scope subtree
# filter: uid=Newton
# requesting: ALL
#

# newton, example.com
dn: uid=newton,dc=example,dc=com
sn: Newton
objectClass: inetOrgPerson
objectClass: organizationalPerson
objectClass: person
objectClass: top
uid: newton
mail: newton@ldap.forumsys.com
cn: Isaac Newton

# search result
search: 2
result: 0 Success

# numResponses: 2
# numEntries: 1

[dave@dave git]$ ldapsearch -W -h ldap.forumsys.com -D "cn=read-only-admin,dc=example,dc=com" -b "dc=example,dc=com""uid=Newton" mail
Enter LDAP Password: 
# extended LDIF
#
# LDAPv3
# base <dc=example,dc=com> with scope subtree
# filter: uid=Newton
# requesting: mail 
#

# newton, example.com
dn: uid=newton,dc=example,dc=com
mail: newton@ldap.forumsys.com

# search result
search: 2
result: 0 Success

# numResponses: 2
# numEntries: 1

package ldap;

import java.util.ArrayList;
import java.util.Properties;


import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attributes;
import javax.naming.directory.Attribute;
import javax.naming.Context;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;

public class TestLDAP {
    private static final String CONTEXT_FACTORY = "com.sun.jndi.ldap.LdapCtxFactory";

    private InitialDirContext ctx;
    private String basedn;
    private SearchControls ctrls;

    private TestLDAP(String url, String user, String password, String b) throws NamingException {
        ctx = TestLDAP.doConnect(url, user, password);
        basedn = b.length() > 0 ? "," + b : b;
        ctrls = new SearchControls();
    }

    public ArrayList<Attributes> search(String base, String filter) throws NamingException {
        NamingEnumeration<SearchResult> ne = ctx.search(base + basedn, filter, ctrls);
        ArrayList<Attributes> arr = new ArrayList<>();
        while (ne.hasMore()) {
            arr.add(ne.next().getAttributes());
        }
        return arr;
    }

    public Attributes get(String base) throws NamingException {
        return ctx.getAttributes(base + basedn);
    }

    private static InitialDirContext doConnect(String url, String user, String password) throws NamingException {
        Properties props = new Properties();
        props.put(Context.INITIAL_CONTEXT_FACTORY, CONTEXT_FACTORY);
        props.put(Context.PROVIDER_URL, url);
        props.put(Context.SECURITY_PRINCIPAL, user);
        props.put(Context.SECURITY_CREDENTIALS, password);

        return new InitialDirContext(props);
    }

    public static TestLDAP connect(String url, String user, String pass, String basedn) throws NamingException {
        return new TestLDAP(url, user, pass, basedn);
    }

    public static boolean testConnection(String url, String user, String password) {
        try {
            return TestLDAP.doConnect(url, user, password) != null;
        } catch (Exception e) {
            return false;
        }
    }

    public static void main(String[] args) {
        try {
            TestLDAP testLDAP = new TestLDAP("ldap://ldap.forumsys.com", "cn=read-only-admin,dc=example,dc=com",
"password", "dc=example,dc=com");
            Attributes attributes = testLDAP.get("uid=Newton");

            NamingEnumeration<? extends Attribute> allAttributes = attributes.getAll();
            while (allAttributes.hasMore()) {
                Attribute attribute = allAttributes.next();
                System.out.println(attribute.getID() + "=" + attribute.get().toString());
            }

        } catch (NamingException e) {
            e.printStackTrace();
        }
    }
}