<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Set of functions used to run http authentication.
 * NOTE: Requires PHP loaded as a Apache module.
 *
 * @package phpMyAdmin-Auth-HTTP
 */


/**
 * Displays authentication form
 *
 * @global  string    the font face to use in case of failure
 * @global  string    the default font size to use in case of failure
 * @global  string    the big font size to use in case of failure
 *
 * @return  boolean   always true (no return indeed)
 *
 * @access  public
 */
function PMA_auth()
{
    /* Perform logout to custom URL */
    if (!empty($_REQUEST['old_usr']) && !empty($GLOBALS['cfg']['Server']['LogoutURL'])) {
        PMA_sendHeaderLocation($GLOBALS['cfg']['Server']['LogoutURL']);
        exit;
    }

    if (empty($GLOBALS['cfg']['Server']['auth_http_realm'])) {
        if (empty($GLOBALS['cfg']['Server']['verbose'])) {
            $server_message = $GLOBALS['cfg']['Server']['host'];
        } else {
            $server_message = $GLOBALS['cfg']['Server']['verbose'];
        }
        $realm_message = 'phpMyAdmin ' . $server_message;
    } else {
        $realm_message = $GLOBALS['cfg']['Server']['auth_http_realm'];
    }
    // remove non US-ASCII to respect RFC2616
    $realm_message = preg_replace('/[^\x20-\x7e]/i', '', $realm_message);
    header('WWW-Authenticate: Basic realm="' . $realm_message .  '"');
    header('HTTP/1.0 401 Unauthorized');
    if (php_sapi_name() !== 'cgi-fcgi') {
	header('status: 401 Unauthorized');
    }

    // Defines the charset to be used
    header('Content-Type: text/html; charset=' . $GLOBALS['charset']);
    /* HTML header */
    $page_title = __('Access denied');
    require './libraries/header_meta_style.inc.php';
    ?>
</head>
<body>
    <?php
    if (file_exists(CUSTOM_HEADER_FILE)) {
        require CUSTOM_HEADER_FILE;
    }
    ?>

<br /><br />
<center>
    <h1><?php echo sprintf(__('Welcome to %s'), ' phpMyAdmin'); ?></h1>
</center>
<br />

    <?php
    PMA_Message::error(__('Wrong username/password. Access denied.'))->display();

    if (file_exists(CUSTOM_FOOTER_FILE)) {
        require CUSTOM_FOOTER_FILE;
    }
    ?>

</body>
</html>
    <?php
    exit();
} // end of the 'PMA_auth()' function


/**
 * Gets advanced authentication settings
 *
 * @global  string    the username if register_globals is on
 * @global  string    the password if register_globals is on
 * @global  array     the array of server variables if register_globals is
 *                    off
 * @global  array     the array of environment variables if register_globals
 *                    is off
 * @global  string    the username for the ? server
 * @global  string    the password for the ? server
 * @global  string    the username for the WebSite Professional server
 * @global  string    the password for the WebSite Professional server
 * @global  string    the username of the user who logs out
 *
 * @return  boolean   whether we get authentication settings or not
 *
 * @access  public
 */
function PMA_auth_check()
{
    global $PHP_AUTH_USER, $PHP_AUTH_PW;
    global $old_usr;

    // Grabs the $PHP_AUTH_USER variable whatever are the values of the
    // 'register_globals' and the 'variables_order' directives
    if (empty($PHP_AUTH_USER)) {
        if (PMA_getenv('PHP_AUTH_USER')) {
            $PHP_AUTH_USER = PMA_getenv('PHP_AUTH_USER');
        } elseif (PMA_getenv('REMOTE_USER')) {
            // CGI, might be encoded, see below
            $PHP_AUTH_USER = PMA_getenv('REMOTE_USER');
        } elseif (PMA_getenv('REDIRECT_REMOTE_USER')) {
            // CGI, might be encoded, see below
            $PHP_AUTH_USER = PMA_getenv('REDIRECT_REMOTE_USER');
        } elseif (PMA_getenv('AUTH_USER')) {
            // WebSite Professional
            $PHP_AUTH_USER = PMA_getenv('AUTH_USER');
        } elseif (PMA_getenv('HTTP_AUTHORIZATION')) {
            // IIS, might be encoded, see below
            $PHP_AUTH_USER = PMA_getenv('HTTP_AUTHORIZATION');
        } elseif (PMA_getenv('Authorization')) {
            // FastCGI, might be encoded, see below
            $PHP_AUTH_USER = PMA_getenv('Authorization');
        }
    }
    // Grabs the $PHP_AUTH_PW variable whatever are the values of the
    // 'register_globals' and the 'variables_order' directives
    if (empty($PHP_AUTH_PW)) {
        if (PMA_getenv('PHP_AUTH_PW')) {
            $PHP_AUTH_PW = PMA_getenv('PHP_AUTH_PW');
        } elseif (PMA_getenv('REMOTE_PASSWORD')) {
            // Apache/CGI
            $PHP_AUTH_PW = PMA_getenv('REMOTE_PASSWORD');
        } elseif (PMA_getenv('AUTH_PASSWORD')) {
            // WebSite Professional
            $PHP_AUTH_PW = PMA_getenv('AUTH_PASSWORD');
        }
    }

    // Decode possibly encoded information (used by IIS/CGI/FastCGI)
    // (do not use explode() because a user might have a colon in his password
    if (strcmp(substr($PHP_AUTH_USER, 0, 6), 'Basic ') == 0) {
        $usr_pass = base64_decode(substr($PHP_AUTH_USER, 6));
        if (! empty($usr_pass)) {
            $colon = strpos($usr_pass, ':');
            if ($colon) {
                $PHP_AUTH_USER = substr($usr_pass, 0, $colon);
                $PHP_AUTH_PW = substr($usr_pass, $colon + 1);
            }
            unset($colon);
        }
        unset($usr_pass);
    }

    // User logged out -> ensure the new username is not the same
    if (!empty($old_usr)
        && (isset($PHP_AUTH_USER) && $old_usr == $PHP_AUTH_USER)) {
        $PHP_AUTH_USER = '';
        // -> delete user's choices that were stored in session
        session_destroy();
    }

    // Returns whether we get authentication settings or not
    if (empty($PHP_AUTH_USER)) {
        return false;
    } else {
        return true;
    }
} // end of the 'PMA_auth_check()' function


/**
 * Set the user and password after last checkings if required
 *
 * @global  array     the valid servers settings
 * @global  integer   the id of the current server
 * @global  array     the current server settings
 * @global  string    the current username
 * @global  string    the current password
 *
 * @return  boolean   always true
 *
 * @access  public
 */
function PMA_auth_set_user()
{
    global $cfg, $server;
    global $PHP_AUTH_USER, $PHP_AUTH_PW;

    // Ensures valid authentication mode, 'only_db', bookmark database and
    // table names and relation table name are used
    if ($cfg['Server']['user'] != $PHP_AUTH_USER) {
        $servers_cnt = count($cfg['Servers']);
        for ($i = 1; $i <= $servers_cnt; $i++) {
            if (isset($cfg['Servers'][$i])
                && ($cfg['Servers'][$i]['host'] == $cfg['Server']['host'] && $cfg['Servers'][$i]['user'] == $PHP_AUTH_USER)) {
                $server        = $i;
                $cfg['Server'] = $cfg['Servers'][$i];
                break;
            }
        } // end for
    } // end if

    $cfg['Server']['user']     = $PHP_AUTH_USER;
    $cfg['Server']['password'] = $PHP_AUTH_PW;

    // Avoid showing the password in phpinfo()'s output
    unset($GLOBALS['PHP_AUTH_PW']);
    unset($_SERVER['PHP_AUTH_PW']);

    return true;
} // end of the 'PMA_auth_set_user()' function


/**
 * User is not allowed to login to MySQL -> authentication failed
 *
 * @return  boolean   always true (no return indeed)
 *
 * @access  public
 */
function PMA_auth_fails()
{
    $error = PMA_DBI_getError();
    if ($error && $GLOBALS['errno'] != 1045) {
        PMA_fatalError($error);
    } else {
        PMA_auth();
        return true;
    }

} // end of the 'PMA_auth_fails()' function

?>
