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LDAP with SSL support (LDAPS) [message #168669] Thu, 27 June 2013 09:24 Go to next message
Argure is currently offline  Argure   Netherlands
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Github: github.com/piratenpartij/forum.piratenpartij.nl/tree/master/include/plugins /ldap
(Note: use the above link for the most recent changes rather than relying on the snippets below, which are unlikely to be updated).

Code license is CC0 1.0 Universal Public Domain Dedication.

This goes into your data root (e.g., /var/www/FUDforum/plugins/ldap).

Code:

%dataroot%/plugins/ldap/ldap.plugin

<?php
	/*
	 * copyright: (C) 2001-2011 Advanced Internet Designs Inc.
	 * email    : forum(at)prohost(dot)org
	 * $Id: ldap.plugin 5373 2011-09-02 18:44:54Z naudefj $
	 *
	 * This program is free software; you can redistribute it and/or modify
	 * it under the terms of the GNU General Public License as published by
	 * the Free Software Foundation; version 2 of the License.
	 *
	 * Modifications for LDAPS support written in 2013 by Patrick Godschalk,
	 * <patrick(dot)godschalk(at)piratenpartij(dot)nl>
	 */

	// Initialize me as an authentication plugin if LDAP extension is
	// loaded.
	plugin_add_hook('AUTHENTICATE', 'plugin_ldap_auth');

	// Authenticate users from LDAP directory.
	function plugin_ldap_auth() {
		$login    = $_POST['login'];
		$password = $_POST['password'];

		if ($login == 'admin') {
			return 1; // Always allow admin through.
		}

		if ((include_once $GLOBALS['PLUGIN_PATH'] .'ldap/ldap.ini') === false) {
			echo 'ERROR: Please configure the LDAP plugin from the Plugin Manager Control panel.';
			return 0;
		}

		if (defined('fud_debug')) {
			ldap_set_option(NULL, LDAP_OPT_DEBUG_LEVEL, 7);
		}

		if ($ini['LDAP_SSL'] == "1") {
			$connection = ldap_connect("ldaps://" . $ini['LDAP_HOST'] . ":" . $ini['LDAP_PORT']);
		} else {
			$connection = ldap_connect($ini['LDAP_HOST'], $ini['LDAP_PORT']);
		}

		if (!$connection) {
			echo 'Unable to connect to an LDAP server. Contact the forum administrator! (Debug 1)';
			return 0;
		}

		ldap_set_option($connection, LDAP_OPT_PROTOCOL_VERSION, 3);
		ldap_set_option($connection, LDAP_OPT_REFERRALS, 0);
		if ($ini['LDAP_START_TLS']) {
			if (!ldap_start_tls($connection)) {
				echo 'Unable to connect to LDAP server via TLS! (Debug 2)';
				return 0;
			}
		}

		// Connection made -- bind anonymously and get dn for username.
		$bind = ldap_bind($connection, $ini['LDAP_PROXY_DN'], $ini['LDAP_PROXY_DN_PASS']);

		if (!$bind) {
			echo 'Bind to LDAP failed:', ldap_error($connection), ' Contact the forum administrator! (Debug 3)';
			return 0;
		}

		$search = ldap_search($connection, $ini['LDAP_DN'], $ini['LDAP_UID'] .'='. $login);

		// Ensure only 1 result was returned - if not, there may be a * in the username.
		if (ldap_count_entries($connection, $search) != 1) {
			// echo 'Unknown username. Please try to login again. (Debug 4)';
			return 0;
		}

		$info = ldap_get_entries($connection, $search);

		// Now, try to rebind with their full dn and password.
		$bind = ldap_bind($connection, $info[0][dn], $password);
		if (!$bind || !isset($bind)) {
			// echo 'Wrong password! Please try again. (Debug 5)';
			return 0;
		}

		// Now verify the previous search using their credentials.
		$search = ldap_search($connection, $ini['LDAP_DN'], $ini['LDAP_UID'] .'='. $login);

		$info = ldap_get_entries($connection, $search);

		// Some LDAP servers store case but are case insensitive, i.e. Active Directory.
		// If insensitive is on, force everything to lower case.
		if ($ini['LDAP_CASE_INSENSITIVE']) {
			$login = strtolower($login);
			$ldap_login = strtolower($info[0][ $ini['LDAP_UID'] ][0]);
		} else {
			$ldap_login = $info[0][ $ini['LDAP_UID'] ][0];
		}

		if ($login == $ldap_login) {
			// Let user through, but first regsister in FUDforum's DB.

			if (!($usr_d = db_sab('SELECT id, passwd, salt FROM '. $GLOBALS['DBHOST_TBL_PREFIX'] .'users WHERE login='. _esc($login)))) {
				// Register new FUDforum user.
				$uent = new fud_user_reg;
				$uent->users_opt = -1;
				$uent->login = $login;
				$uent->plaintext_passwd = $password;
				$uent->email = $login .'@'. $ini['LDAP_HOST'];
				$uent->add_user();
			} else if ( !((empty($usr_d->salt) && $usr_d->passwd == md5($password)) || $usr_d->passwd == sha1($usr_d->salt . sha1($password)))) {
				// Sync password.
				$salt = substr(md5(uniqid(mt_rand(), true)), 0, 9);
				$sec_pass = sha1($salt . sha1($password));
				q('UPDATE '. $GLOBALS['DBHOST_TBL_PREFIX'] .'users SET passwd='. _esc($sec_pass) .', salt='. _esc($salt) .' WHERE id='. $usr_d->id);
			}

			return 1; // Allow access.
		} else {
			return 0; // Deny access.
		}

		ldap_close($connection);
	}

	function ldap_info() {
		return array('name' => 'LDAP Authentication',
					 'desc' => 'Authenticate forum users from an LDAP server. You may want to disable "<i>Allow Registration</i>" from the <i>Global Settings Manager</i> after enabling this plugin.',
					 'cat'  => 'Authentication',
					 'version' => '1.3');
	}

	function ldap_enable() {
		if (!extension_loaded('ldap')) {
			return array(null, 'You PHP installation doesn\'t support LDAP.'); // OK, Err.
		}
		return;	// Good to go.
	}

	function ldap_config() {
		if((include $GLOBALS['PLUGIN_PATH'] .'ldap/ldap.ini') === false) {
			$ini = NULL;
		}

		if (isset($_POST['Set'])) {
			foreach (array_keys($_POST) as $key) {
				if (substr($key,0,5) == 'LDAP_') {
					$ini[$key] = $_POST[$key];
				}
			}

			// Array key from ldap_get_entries() must be lowercase.
			$ini['LDAP_UID'] = strtolower($ini['LDAP_UID']);

			$fp = fopen($GLOBALS['PLUGIN_PATH'] .'ldap/ldap.ini', 'w');
			fwrite($fp, '<?php $ini = '. var_export($ini, 1) .'; ?>');
			fclose($fp);
			pf(successify('Settings successfully saved.'));
		}

?>
<p>Space-separated list of LDAP server names:<br />
<input name="LDAP_HOST" value="<?php echo $ini['LDAP_HOST'] ?>" /></p>

<p>LDAP server port. Default is 389:<br />
<input name="LDAP_PORT" value="<?php echo $ini['LDAP_PORT'] ?>" /></p>

<p>Enable TLS (Transport Layer Security) mode:<br />
<label><input type="radio" name="LDAP_START_TLS" value="1" <?php echo $ini['LDAP_START_TLS'] ? 'checked="checked"' : '' ?> /> True<br /></label>
<label><input type="radio" name="LDAP_START_TLS" value=""  <?php echo $ini['LDAP_START_TLS'] ? '' : 'checked="checked"' ?> /> False</label></p>

<p>Use LDAP+SSL (LDAPS):<br />
<label><input type="radio" name="LDAP_SSL" value="1" <?php echo $ini['LDAP_SSL'] ? 'checked="checked"' : '' ?> /> True<br /></label>
<label><input type="radio" name="LDAP_SSL" value=""  <?php echo $ini['LDAP_SSL'] ? '' : 'checked="checked"' ?> /> False</label></p>

<p>Is the LDAP server case insensitive (like Active Directory):<br />
<label><input type="radio" name="LDAP_CASE_INSENSITIVE" value="1" <?php echo $ini['LDAP_CASE_INSENSITIVE'] ? 'checked="checked"' : '' ?> /> True<br /></label>
<label><input type="radio" name="LDAP_CASE_INSENSITIVE" value=""  <?php echo $ini['LDAP_CASE_INSENSITIVE'] ? '' : 'checked="checked"' ?> /> False</label></p>

<p>Proxy user (if required to bind via proxy):<br />
<input name="LDAP_PROXY_DN" value="<?php echo $ini['LDAP_PROXY_DN'] ?>" /></p>

<p>Proxy password (if required to bind via proxy):<br />
<input name="LDAP_PROXY_DN_PASS" value="<?php echo $ini['LDAP_PROXY_DN_PASS'] ?>" /></p>

<p>Look for usernames in namespace:<br />
<input name="LDAP_DN" value="<?php echo $ini['LDAP_DN'] ?>" /></p>

<p>Property to query:<br />
<input name="LDAP_UID" value="<?php echo $ini['LDAP_UID'] ?>" /></p>
<?php
	}

?>


%dataroot%/plugins/ldap/ldap.ini

<?php $ini = array (
  'LDAP_HOST' => 'ldap.mycompany.com',
  'LDAP_PORT' => '636',
  'LDAP_START_TLS' => '',
  'LDAP_SSL' => '1',
  'LDAP_CASE_INSENSITIVE' => '1',
  'LDAP_PROXY_DN' => 'cn=fudforum,ou=System,dc=mycompany,dc=com',
  'LDAP_PROXY_DN_PASS' => '6CEKOwcvsMna',
  'LDAP_DN' => 'ou=People,dc=mycompany,dc=com',
  'LDAP_UID' => 'uid',
); ?>
Re: LDAP with SSL support (LDAPS) [message #168670 is a reply to message #168669] Thu, 27 June 2013 09:56 Go to previous messageGo to next message
naudefj is currently offline  naudefj   
Messages: 3632
Registered: December 2004
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Can you please post a diff so we can update the FUDforum repository as well?
Re: LDAP with SSL support (LDAPS) [message #168672 is a reply to message #168670] Thu, 27 June 2013 10:13 Go to previous messageGo to next message
Argure is currently offline  Argure   Netherlands
Messages: 4
Registered: June 2013
Location: Leiden
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Mainly:

ldap.plugin 37:41
		if ($ini['LDAP_SSL'] == "1") {
			$connection = ldap_connect("ldaps://" . $ini['LDAP_HOST'] . ":" . $ini['LDAP_PORT']);
		} else {
			$connection = ldap_connect($ini['LDAP_HOST'], $ini['LDAP_PORT']);
		}


ldap.plugin 168:170
<p>Use LDAP+SSL (LDAPS):<br />
<label><input type="radio" name="LDAP_SSL" value="1" <?php echo $ini['LDAP_SSL'] ? 'checked="checked"' : '' ?> /> True<br /></label>
<label><input type="radio" name="LDAP_SSL" value=""  <?php echo $ini['LDAP_SSL'] ? '' : 'checked="checked"' ?> /> False</label></p>


ldap.ini 5
  'LDAP_SSL' => '1',
Re: LDAP with SSL support (LDAPS) [message #168673 is a reply to message #168672] Thu, 27 June 2013 12:20 Go to previous message
naudefj is currently offline  naudefj   
Messages: 3632
Registered: December 2004
Karma: 17
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Administrator
Core Developer
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Thanks. Committed at http://sourceforge.net/p/fudforum/code/5615/
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