<?php

require_once(KT_LIB_DIR . '/authentication/authenticationprovider.inc.php');
require_once(KT_LIB_DIR . '/authentication/Authenticator.inc');

class KTBuiltinAuthenticationProvider extends KTAuthenticationProvider {
    var $sName = "Built-in authentication provider";
    var $sNamespace = "ktstandard..builtin";

    function &getAuthenticator() {
        return new LDAPAuthenticator;
    }

    function saveConfig(&$oSource, $aRequest) {
        return true;
    }

    function configFields($oSource) {
        return array();
    }
}

class LDAPAuthenticator extends Authenticator {
    /**
     * The LDAP server to connect to
     */
    var $sLdapServer;
    /**
     * The base LDAP DN to perform authentication against
     */
    var $sBaseDN;
    /**
     * The LDAP accessor class
     */
    var $oLdap;

    /**
     * Creates a new instance of the LDAPAuthenticator
     *
     * @param string the LDAP server to connect to for validation (optional)
     * @param string the dn branch to perform the authentication against (optional)
     * @param string the ldap server type (optional)
     */
    function LDAPAuthenticator($sLdapServer = "", $sLdapDN = "", $sServerType = "", $sLdapDomain = "") {
        global $default;

        $this->sLdapServer = strlen($sLdapServer) > 0 ? $sLdapServer : $default->ldapServer;
        $this->sBaseDN = strlen($sLdapDN) > 0 ? $sLdapDN : $default->ldapRootDn;
        $this->sServerType = strlen($sServerType) > 0 ? $sServerType : $default->ldapServerType;
        $this->sLdapDomain = strlen($sLdapDomain) > 0 ? $sLdapDomain : $default->ldapDomain;

        // initialise and setup ldap class
        $this->oLdap = new AuthLdap($this->sLdapServer, $this->sBaseDN, $this->sServerType, $this->sLdapDomain, $default->ldapSearchUser, $default->ldapSearchPassword);
    }

    /**
     * Checks the user's password against the LDAP directory
     *
     * @param string the name of the user to check
     * @param string the password to check
     * @return boolean true if the password is correct, else false
     */
    function checkPassword($sUserName, $sPassword) {
        global $default;
        if ($this->oLdap->connect()) {
            // lookup dn from username - must exist in db
            $sBindDn = lookupField($default->users_table, "ldap_dn", "username", $sUserName);
            if ($sBindDn && $sPassword) {
                if ( $this->oLdap->authBind($sBindDn, $sPassword) ) {
                    return true;
                } else {
                    $_SESSION["errorMessage"] = "LDAP error: (" . $this->oLdap->ldapErrorCode . ") " . $this->oLdap->ldapErrorText;
                    return false;
                }
            } else {
                // no ldap_dn for this user, so reject this authentication attempt
                $_SESSION["errorMessage"] = "Username $sUserName does not not exist in the DMS.  Please contact the System Administrator for assistance.";
                return false;
            }
        } else {
            $_SESSION["errorMessage"] = "LDAP error: (" . $this->oLdap->ldapErrorCode . ") " . $this->oLdap->ldapErrorText;
            return false;
        }
    }


    /**
     * Searched the directory for a specific user
     *
     * @param string the username to search for
     * @param array the attributes to return from the search
     * @return array containing the users found
     */
    function getUser($sUserName, $aAttributes) {
        global $default;
        // connect and search
        if ( $this->oLdap->connect() ) {
            // search for the users
            // append and prepend wildcards
            $aUserResults = $this->oLdap->getUsers($sUserName, $aAttributes);
            if ($aUserResults) {
                // return the array
                return $aUserResults;
            } else {
                // the search failed, return empty array
                return array();
            }
        } else {
            $_SESSION["errorMessage"] = "LDAP error: (" . $this->oLdap->ldapErrorCode . ") " . $this->oLdap->ldapErrorText;
            return false;
        }
    }

    /**
     * Searches the LDAP directory for users matching the supplied search string.
     *
     * @param string the username to search for
     * @param array the attributes to return from the search
     * @return array containing the users found
     */
    function searchUsers($sUserNameSearch, $aAttributes) {
        global $default;
        // connect and search
        if ( $this->oLdap->connect() ) {
            // search for the users
            // append and prepend wildcards
            $aUserResults = $this->oLdap->getUsers("*" . $sUserNameSearch . "*", $aAttributes);
            if ($aUserResults) {
                // return the array
                return $aUserResults;
            } else {
                // the search failed, return empty array
                return array();
            }
        } else {
            $default->log->error("LDAPAuthentication::searchUsers LDAP error: (" . $this->oLdap->ldapErrorCode . ") " . $this->oLdap->ldapErrorText);
            return false;
        }
    }
}