Made the ldap plugin work, and add a readme

plugins/Ldap/LdapPlugin.php

@@ -31,8 +31,12 @@ if (!defined('STATUSNET') && !defined('LACONICA')) {
     exit(1);
 }
 
+require_once INSTALLDIR.'/plugins/Ldap/ldap.php';
+
 class LdapPlugin extends Plugin
 {
+    private $config = array();
+
     function __construct()
     {
         parent::__construct();
@@ -40,6 +44,9 @@ class LdapPlugin extends Plugin
 
     function onCheckPassword($nickname, $password, &$authenticated)
     {
-        
+        if(ldap_check_password($nickname, $password)){
+            $authenticated = true;
+            return false;
+        }
     }
 }

plugins/Ldap/README

@@ -0,0 +1,16 @@
+The LDAP plugin allows for StatusNet to handle authentication, authorization, and user information through LDAP.
+
+Installation
+============
+Add configuration entries to config.php. These entries are:
+
+The following are documented at http://pear.php.net/manual/en/package.networking.net-ldap2.connecting.php
+$config['ldap']['binddn']
+$config['ldap']['bindpw']
+$config['ldap']['basedn']
+$config['ldap']['host']
+
+$config['ldap']['nickname_attribute'] Set this to the name of the ldap attribute that holds the username. For example, on Microsoft's Active Directory, this should be set to 'sAMAccountName'
+
+Finally, add "addPlugin('ldap');" to the bottom of your config.php
+

plugins/Ldap/ldap.php

@@ -0,0 +1,106 @@
+<?php
+/*
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2008, 2009, StatusNet, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+
+require_once 'Net/LDAP2.php';
+
+function ldap_get_config(){
+    static $config = null;
+    if($config == null){
+        $config = array();
+        $keys = array('host','port','version','starttls','binddn','bindpw','basedn','options','scope');
+        foreach($keys as $key){
+            $value = common_config('ldap', $key);
+            if($value!==false){
+                $config[$key]=$value;
+            }
+        }
+    }
+    return $config;
+}
+
+function ldap_get_connection($config = null){
+    if($config == null){
+        static $ldap = null;
+        if($ldap!=null){
+            return $ldap;
+        }
+        $config = ldap_get_config();
+    }
+    $ldap = Net_LDAP2::connect($config);
+    if (PEAR::isError($ldap)) {
+        common_log(LOG_WARNING, 'Could not connect to LDAP server: '.$ldap->getMessage());
+        return false;
+    }else{
+        return $ldap;
+    }
+}
+
+function ldap_check_password($username, $password){
+    $ldap = ldap_get_connection();
+    if(!$ldap){
+        return false;
+    }
+    $dn = ldap_get_user_dn($username);
+    if(!$dn){
+        return false;
+    }else{
+        $config = ldap_get_config();
+        $config['binddn']=$dn;
+        $config['bindpw']=$password;
+        if(ldap_get_connection($config)){
+            return true;
+        }else{
+            return false;
+        }
+    }
+}
+
+/**
+ * get an LDAP user's DN given the user's username
+ * 
+ * @param string $username
+ * @return string DN
+ */
+function ldap_get_user_dn($username){
+    $ldap = ldap_get_connection();
+    $filter = Net_LDAP2_Filter::create(common_config('ldap','nickname_attribute'), 'equals',  $username);
+    $options = array(
+        'scope' => 'sub',
+        'attributes' => array()
+    );
+    $search = $ldap->search(null,$filter,$options);
+    
+    if (PEAR::isError($search)) {
+        common_log(LOG_WARNING, 'Error while getting DN for user: '.$search->getMessage());
+        return false;
+    }
+
+    if($search->count()==0){
+        return false;
+    }else if($search->count()==1){
+        $entry = $search->shiftEntry();
+        return $entry->dn();
+    }else{
+        common_log(LOG_WARNING, 'Found ' . $search->count() . ' ldap user with the username: ' . $username);
+        return false;
+    }
+}
+