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copied!<p>This is a mashup of stuff I found in various places. It should put you along the correct path if you don't want to use the UnboundID SDK. This isn't production quality, you might want to add the SSL stuff in here if your shop supports it.<br> <br></p> <pre><code>public static Boolean validateLogin(String userName, String userPassword) { Hashtable<String, String> env = new Hashtable<String, String>(); env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory"); env.put(Context.PROVIDER_URL, "ldap://" + LDAP_SERVER + ":" + LDAP_SERVER_PORT + "/" + LDAP_BASE_DN); // To get rid of the PartialResultException when using Active Directory env.put(Context.REFERRAL, "follow"); // Needed for the Bind (User Authorized to Query the LDAP server) env.put(Context.SECURITY_AUTHENTICATION, "simple"); env.put(Context.SECURITY_PRINCIPAL, LDAP_BIND_DN); env.put(Context.SECURITY_CREDENTIALS, LDAP_BIND_PASSWORD); DirContext ctx; try { ctx = new InitialDirContext(env); } catch (NamingException e) { throw new RuntimeException(e); } NamingEnumeration<SearchResult> results = null; try { SearchControls controls = new SearchControls(); controls.setSearchScope(SearchControls.SUBTREE_SCOPE); // Search Entire Subtree controls.setCountLimit(1); //Sets the maximum number of entries to be returned as a result of the search controls.setTimeLimit(5000); // Sets the time limit of these SearchControls in milliseconds String searchString = "(&(objectCategory=user)(sAMAccountName=" + userName + "))"; results = ctx.search("", searchString, controls); if (results.hasMore()) { SearchResult result = (SearchResult) results.next(); Attributes attrs = result.getAttributes(); Attribute dnAttr = attrs.get("distinguishedName"); String dn = (String) dnAttr.get(); // User Exists, Validate the Password env.put(Context.SECURITY_PRINCIPAL, dn); env.put(Context.SECURITY_CREDENTIALS, userPassword); new InitialDirContext(env); // Exception will be thrown on Invalid case return true; } else return false; } catch (AuthenticationException e) { // Invalid Login return false; } catch (NameNotFoundException e) { // The base context was not found. return false; } catch (SizeLimitExceededException e) { throw new RuntimeException("LDAP Query Limit Exceeded, adjust the query to bring back less records", e); } catch (NamingException e) { throw new RuntimeException(e); } finally { if (results != null) { try { results.close(); } catch (Exception e) { /* Do Nothing */ } } if (ctx != null) { try { ctx.close(); } catch (Exception e) { /* Do Nothing */ } } } } </code></pre>

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