Need a simple Java LDAP client

[Dan Grindstaff]

Hello, I need a simple java class that can search and return values from an LDAP directory. Does anyone know of any available code? TIA.

[Dan Grindstaff]

Hi, I have found a program that reads as follows:

  // javax.naming and javax.naming.directory are
// part of the JNDI component of J2SE 1.3+.
import javax.naming.directory.*;
import javax.naming.*;
import java.util.Vector;
import java.util.Enumeration;
import java.util.Properties;
public class SearchLDAP {
    public static void main(String[] args) {
        // The search base is the level in the hierarchy
        // that our search will start at. Here was use ""
        // which indicates the very root of the directory.
        String base = "";
        // LDAP filters are sort of like a WHERE clause. It
        // is constructed in a standard way based on LDAP
        // standards. The search here is a simple one that
        // says to return any entry with an objectclass value.
        // Since all entries must contain an objectclass, all
        // entries will be returned.
        String filter = "(objectclass=*)";
        // Here we set some connection properties for JNDI.
        Properties env = new Properties();
        // The Sun provider is the most widely used JNDI
        // provider and comes with Java 1.3+
        env.put(DirContext.INITIAL_CONTEXT_FACTORY,
                "com.sun.jndi.ldap.LdapCtxFactory");
        // The provider URL is an LDAP URL that tells JNDI
        // where it will need to connect to.
        env.put(DirContext.PROVIDER_URL,"ldap://localhost:389");
        try {
            // Here we create a DirContext object using
            // the environment we setup above. This
            // object will be used to communicate with
            // the server.
            DirContext dc = new InitialDirContext(env);
            // Above we mentioned the filter and base.
            // Another important part of the search criteria
            // is the scope. There are three scopes: base (this
            // entry only), onelevel (the direct children of this
            // entry), and subtree (this entry and all of its
            // decendents in the tree). In JNDI, OBJECT_SCOPE
            // indicates a base search.
            SearchControls sc = new SearchControls();
            sc.setSearchScope(SearchControls.OBJECT_SCOPE);
NamingEnumeration ne = null;
            // Here we actually perform the search.
            ne = dc.search(base, filter, sc);
            // We cycle through the NamingEnumeration
            // that is returned by the search.
            while (ne.hasMore()) {
                // Retrieve the result as a SearchResult
                // and print it (not very pretty). There are
                // methods for extracting the attributes and
                // values without printing, as well.
                SearchResult sr = (SearchResult) ne.next();
                System.out.println(sr.toString()+"\n");
            }
            // Here we unbind from the LDAP server.
            dc.close();
        } catch (NamingException nex) {
            // A number of exceptions are subclassed from
            // NamingException. In a real application you'd
            // probably want to handle many of them
            // differently.
            System.err.println("Error: " + nex.getMessage());
        }
    }
}  

I need some additional code to do simple name/password authentication. TIA.

[Dan Grindstaff]

I was able to find another program that does exactly what I need including authentication.

  package security;
import java.util.Hashtable;
import java.util.Enumeration;
import javax.naming.*;
import javax.naming.directory.*;
public class JDSAuthentication {
public static String INITCTX = "com.sun.jndi.ldap.LdapCtxFactory";
public static String MY_HOST = "ldap://yoda:391";
public static String MY_SEARCHBASE = "dc=isdintegration,dc=com";
public static String MY_FILTER = "jabberID=test1@yoda";
public static String MGR_DN = "cn=directory manager";
public static String MGR_PW = "passwordadmin";
public static void main(String[] args) {
try{
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY,INITCTX);
env.put(Context.PROVIDER_URL,MY_HOST);
env.put(Context.SECURITY_AUTHENTICATION,"simple");
env.put(Context.SECURITY_PRINCIPAL,MGR_DN);
env.put(Context.SECURITY_CREDENTIALS,MGR_PW);
DirContext ctx = new InitialDirContext(env);
SearchControls constraints = new SearchControls();
constraints.setSearchScope(SearchControls.SUBTREE_SCOPE);
//performs the actual search
//We give it a searchbase, a filter and the contraints containing the scope
//of the search
NamingEnumeration results = ctx.search(MY_SEARCHBASE,MY_FILTER,constraints);
//now stop through the search results
while(results != null && results.hasMore()){
SearchResult sr = (SearchResult)results.next();
String dn = sr.getName();
System.out.println("Distinguished name is "+dn);
Attributes attrs = sr.getAttributes();
for(NamingEnumeration ne = attrs.getAll();ne.hasMoreElements()  {
Attribute attr = (Attribute) ne.next();
String attrID = attr.getID();
System.out.println(attrID+" :");
for(Enumeration vals = attr.getAll();vals.hasMoreElements()  {
System.out.println("\t"+vals.nextElement());
}
}
System.out.println("\n");
}
}catch(Exception ex){
ex.printStackTrace();
System.exit(1);
}
}
}  

[Dan Grindstaff]

Hello all, I have been told that my connection to the ldap server will need to go through a proxy server. I will not be able to simply pass the url plus port. Has anyone worked with implementing sockets to connect to an ldap server?

[Dan Grindstaff]

I am researching the sockets issue and wondering if it is possible to pass anything 'secure' through a proxy I have no control over?

[Dan Grindstaff]

Hi All, I am stuck, I need to utilize a proxy server to get out of my network to get to an LDAP server. The admins refuse to make an exception. Is there any way to code into existing classes to utilize a proxy server? Any ideas are most welcome! TIA.

[Dan Grindstaff]

Hello All, i am looking at using http tunneling to make an ldap connection through the proxy server on port 8080. The problem is that I keep getting errors about the protocol not being recognized. I have the following code:

  SocketAddress addr = new InetSocketAddress("userproxy.biperf.com", 8080);
            Proxy proxy = new Proxy(Proxy.Type.HTTP, addr);
            Socket socket = new Socket(proxy);
            InetSocketAddress dest = new InetSocketAddress("198.199.238.205", 389);
            socket.connect(dest);  

Any ideas are greatly appreciated!