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Editing File: /usr/local/cpanel/base/3rdparty/roundcube/plugins/krb_authentication/krb_authentication.php

<?php

/**
 * Kerberos Authentication
 *
 * Make use of an existing Kerberos authentication and perform login
 * with the existing user credentials
 *
 * For other configuration options, see config.inc.php.dist!
 *
 * @license GNU GPLv3+
 * @author Jeroen van Meeuwen
 */
class krb_authentication extends rcube_plugin
{
    private $redirect_query;

/**
     * Plugin initialization
     */
    function init()
    {
        $this->add_hook('startup', [$this, 'startup']);
        $this->add_hook('authenticate', [$this, 'authenticate']);
        $this->add_hook('login_after', [$this, 'login']);
        $this->add_hook('storage_connect', [$this, 'storage_connect']);
        $this->add_hook('managesieve_connect', [$this, 'managesieve_connect']);
        $this->add_hook('smtp_connect', [$this, 'smtp_connect']);
    }

/**
     * Startup hook handler
     */
    function startup($args)
    {
        if (!empty($_SERVER['REMOTE_USER']) && !empty($_SERVER['KRB5CCNAME'])) {
            // handle login action
            if (empty($_SESSION['user_id'])) {
                $args['action']       = 'login';
                $this->redirect_query = $_SERVER['QUERY_STRING'];
            }
            else {
                $_SESSION['password'] = null;
            }
        }

return $args;
    }

/**
     * Authenticate hook handler
     */
    function authenticate($args)
    {
        if (!empty($_SERVER['REMOTE_USER']) && !empty($_SERVER['KRB5CCNAME'])) {
            // Load plugin's config file
            $this->load_config();

$rcmail = rcmail::get_instance();
            $host   = $rcmail->config->get('krb_authentication_host');

if (is_string($host) && trim($host) !== '' && empty($args['host'])) {
                $args['host'] = rcube_utils::idn_to_ascii(rcube_utils::parse_host($host));
            }

if (!empty($_SERVER['REMOTE_USER'])) {
                $args['user'] = $_SERVER['REMOTE_USER'];
                $args['pass'] = null;
            }

$args['cookiecheck'] = false;
            $args['valid']       = true;
        }

return $args;
    }

/**
     * login_after hook handler
     */
    function login($args)
    {
        // Redirect to the previous QUERY_STRING
        if ($this->redirect_query) {
            header('Location: ./?' . $this->redirect_query);
            exit;
        }

return $args;
    }

/**
     * Storage_connect hook handler
     */
    function storage_connect($args)
    {
        if (!empty($_SERVER['REMOTE_USER']) && !empty($_SERVER['KRB5CCNAME'])) {
            $args['gssapi_context'] = $this->gssapi_context('imap');
            $args['gssapi_cn']      = $_SERVER['KRB5CCNAME'];
            $args['auth_type']      = 'GSSAPI';
        }

return $args;
    }

/**
     * managesieve_connect hook handler
     */
    function managesieve_connect($args)
    {
        if (
            (!isset($args['auth_type']) || $args['auth_type'] == 'GSSAPI')
            && !empty($_SERVER['REMOTE_USER']) && !empty($_SERVER['KRB5CCNAME'])
        ) {
            $args['gssapi_context'] = $this->gssapi_context('sieve');
            $args['gssapi_cn']      = $_SERVER['KRB5CCNAME'];
            $args['auth_type']      = 'GSSAPI';
        }

return $args;
    }

/**
     * smtp_connect hook handler
     */
    function smtp_connect($args)
    {
        if (
            (!isset($args['smtp_auth_type']) || $args['smtp_auth_type'] == 'GSSAPI')
            && !empty($_SERVER['REMOTE_USER']) && !empty($_SERVER['KRB5CCNAME'])
        ) {
            $args['gssapi_context'] = $this->gssapi_context('smtp');
            $args['gssapi_cn']      = $_SERVER['KRB5CCNAME'];
            $args['smtp_auth_type'] = 'GSSAPI';
        }

return $args;
    }

/**
     * Returns configured GSSAPI context string
     */
    private function gssapi_context($protocol)
    {
        // Load plugin's config file
        $this->load_config();

$rcmail  = rcmail::get_instance();
        $context = $rcmail->config->get('krb_authentication_context');

if (is_array($context) && isset($context[$protocol])) {
             $context = $context[$protocol];
        }

if (empty($context)) {
            rcube::raise_error("Empty GSSAPI context ($protocol).", true);
        }

return $context;
    }
}

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