cookie.auth.lib.php

简介：一个用PHP编写的

 *          not only if allowed
 * @uses    $GLOBALS['PHP_AUTH_USER']
 * @uses    $GLOBALS['PHP_AUTH_PW']
 * @uses    $GLOBALS['no_activity']
 * @uses    $GLOBALS['server']
 * @uses    $GLOBALS['from_cookie']
 * @uses    $GLOBALS['pma_auth_server']
 * @uses    $cfg['blowfish_secret']
 * @uses    $cfg['AllowArbitraryServer']
 * @uses    $cfg['LoginCookieValidity']
 * @uses    $cfg['Servers']
 * @uses    $_REQUEST['old_usr'] from logout link
 * @uses    $_REQUEST['pma_username'] from login form
 * @uses    $_REQUEST['pma_password'] from login form
 * @uses    $_REQUEST['pma_servername'] from login form
 * @uses    $_COOKIE
 * @uses    $_SESSION['last_access_time']
 * @uses    PMA_removeCookie()
 * @uses    PMA_blowfish_decrypt()
 * @uses    PMA_auth_fails()
 * @uses    time()
 *
 * @return  boolean   whether we get authentication settings or not
 *
 * @access  public
 */
function PMA_auth_check()
{
    // Initialization
    /**
     * @global $GLOBALS['pma_auth_server'] the user provided server to connect to
     */
    $GLOBALS['pma_auth_server'] = '';

    $GLOBALS['PHP_AUTH_USER'] = $GLOBALS['PHP_AUTH_PW'] = '';
    $GLOBALS['from_cookie'] = false;

    // avoid an error in mcrypt
    if (empty($GLOBALS['cfg']['blowfish_secret'])) {
        return false;
    }

    if (defined('PMA_CLEAR_COOKIES')) {
        foreach($GLOBALS['cfg']['Servers'] as $key => $val) {
            PMA_removeCookie('pmaPass-' . $key);
            PMA_removeCookie('pmaServer-' . $key);
            PMA_removeCookie('pmaUser-' . $key);
        }
        return false;
    }

    if (! empty($_REQUEST['old_usr'])) {
        // The user wants to be logged out 
        // -> delete his choices that were stored in session 
        session_destroy(); 
        // -> delete password cookie(s)
        if ($GLOBALS['cfg']['LoginCookieDeleteAll']) {
            foreach($GLOBALS['cfg']['Servers'] as $key => $val) {
                PMA_removeCookie('pmaPass-' . $key);
                if (isset($_COOKIE['pmaPass-' . $key])) {
                    unset($_COOKIE['pmaPass-' . $key]);
                }
            }
        } else {
            PMA_removeCookie('pmaPass-' . $GLOBALS['server']);
            if (isset($_COOKIE['pmaPass-' . $GLOBALS['server']])) {
                unset($_COOKIE['pmaPass-' . $GLOBALS['server']]);
            }
        }
    }

    if (! empty($_REQUEST['pma_username'])) {
        // The user just logged in
        $GLOBALS['PHP_AUTH_USER'] = $_REQUEST['pma_username'];
        $GLOBALS['PHP_AUTH_PW']   = empty($_REQUEST['pma_password']) ? '' : $_REQUEST['pma_password'];
        if ($GLOBALS['cfg']['AllowArbitraryServer'] && isset($_REQUEST['pma_servername'])) {
            $GLOBALS['pma_auth_server'] = $_REQUEST['pma_servername'];
        }
        return true;
    }

    // At the end, try to set the $GLOBALS['PHP_AUTH_USER']
    // and $GLOBALS['PHP_AUTH_PW'] variables from cookies

    // servername
    if ($GLOBALS['cfg']['AllowArbitraryServer']
     && ! empty($_COOKIE['pmaServer-' . $GLOBALS['server']])) {
        $GLOBALS['pma_auth_server'] = $_COOKIE['pmaServer-' . $GLOBALS['server']];
    }

    // username
    if (empty($_COOKIE['pmaUser-' . $GLOBALS['server']])) {
        return false;
    }

    $GLOBALS['PHP_AUTH_USER'] = PMA_blowfish_decrypt(
        $_COOKIE['pmaUser-' . $GLOBALS['server']],
        $GLOBALS['cfg']['blowfish_secret']);

    // user was never logged in since session start
    if (empty($_SESSION['last_access_time'])) {
        return false;
    }

    // User inactive too long
    if ($_SESSION['last_access_time'] < time() - $GLOBALS['cfg']['LoginCookieValidity']) {
        $GLOBALS['no_activity'] = true;
        PMA_auth_fails();
        exit;
    }

    // password
    if (empty($_COOKIE['pmaPass-' . $GLOBALS['server']])) {
        return false;
    }

    $GLOBALS['PHP_AUTH_PW'] = PMA_blowfish_decrypt(
        $_COOKIE['pmaPass-' . $GLOBALS['server']],
        $GLOBALS['cfg']['blowfish_secret'] /* . $_SESSION['last_access_time'] */);

    if ($GLOBALS['PHP_AUTH_PW'] == "\xff(blank)") {
        $GLOBALS['PHP_AUTH_PW'] = '';
    }

    $GLOBALS['from_cookie'] = true;

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


/**
 * Set the user and password after last checkings if required
 *
 * @uses    $GLOBALS['PHP_AUTH_USER']
 * @uses    $GLOBALS['PHP_AUTH_PW']
 * @uses    $GLOBALS['server']
 * @uses    $GLOBALS['from_cookie']
 * @uses    $GLOBALS['pma_auth_server']
 * @uses    $cfg['Server']
 * @uses    $cfg['AllowArbitraryServer']
 * @uses    $cfg['blowfish_secret']
 * @uses    $cfg['LoginCookieStore']
 * @uses    $cfg['PmaAbsoluteUri']
 * @uses    $_SESSION['last_access_time']
 * @uses    PMA_COMING_FROM_COOKIE_LOGIN
 * @uses    PMA_setCookie()
 * @uses    PMA_blowfish_encrypt()
 * @uses    PMA_removeCookie()
 * @uses    PMA_sendHeaderLocation()
 * @uses    time()
 * @uses    define()
 * @return  boolean   always true
 *
 * @access  public
 */
function PMA_auth_set_user()
{
    global $cfg;

    // Ensures valid authentication mode, 'only_db', bookmark database and
    // table names and relation table name are used
    if ($cfg['Server']['user'] != $GLOBALS['PHP_AUTH_USER']) {
        foreach ($cfg['Servers'] as $idx => $current) {
            if ($current['host'] == $cfg['Server']['host']
             && $current['port'] == $cfg['Server']['port']
             && $current['socket'] == $cfg['Server']['socket']
             && $current['ssl'] == $cfg['Server']['ssl']
             && $current['connect_type'] == $cfg['Server']['connect_type']
             && $current['user'] == $GLOBALS['PHP_AUTH_USER']) {
                $GLOBALS['server'] = $idx;
                $cfg['Server']     = $current;
                break;
            }
        } // end foreach
    } // end if

    $pma_server_changed = false;
    if ($GLOBALS['cfg']['AllowArbitraryServer']
     && ! empty($GLOBALS['pma_auth_server'])
     && $cfg['Server']['host'] != $GLOBALS['pma_auth_server']) {
        $cfg['Server']['host'] = $GLOBALS['pma_auth_server'];
        $pma_server_changed = true;
    }
    $cfg['Server']['user']     = $GLOBALS['PHP_AUTH_USER'];
    $cfg['Server']['password'] = $GLOBALS['PHP_AUTH_PW'];

    $_SESSION['last_access_time'] = time();

    // Name and password cookies needs to be refreshed each time
    // Duration = one month for username
    PMA_setCookie('pmaUser-' . $GLOBALS['server'],
        PMA_blowfish_encrypt($cfg['Server']['user'],
            $GLOBALS['cfg']['blowfish_secret']));

    // Duration = as configured
    PMA_setCookie('pmaPass-' . $GLOBALS['server'],
        PMA_blowfish_encrypt(!empty($cfg['Server']['password']) ? $cfg['Server']['password'] : "\xff(blank)",
            $GLOBALS['cfg']['blowfish_secret'] /* . $_SESSION['last_access_time'] */),
        null,
        $GLOBALS['cfg']['LoginCookieStore']);

    // Set server cookies if required (once per session) and, in this case, force
    // reload to ensure the client accepts cookies
    if (! $GLOBALS['from_cookie']) {
        if ($GLOBALS['cfg']['AllowArbitraryServer']) {
            if (! empty($GLOBALS['pma_auth_server'])) {
                // Duration = one month for serverrname
                PMA_setCookie('pmaServer-' . $GLOBALS['server'], $cfg['Server']['host']);
            } else {
                // Delete servername cookie
                PMA_removeCookie('pmaServer-' . $GLOBALS['server']);
            }
        }

        // URL where to go:
        $redirect_url = $cfg['PmaAbsoluteUri'] . 'index.php';

        // any parameters to pass?
        $url_params = array();
        if (strlen($GLOBALS['db'])) {
            $url_params['db'] = $GLOBALS['db'];
        }
        if (strlen($GLOBALS['table'])) {
            $url_params['table'] = $GLOBALS['table'];
        }
        // Language change from the login panel needs to be remembered
        if (! empty($GLOBALS['lang'])) {
            $url_params['lang'] = $GLOBALS['lang'];
        }
        // any target to pass?
        if (! empty($GLOBALS['target']) && $GLOBALS['target'] != 'index.php') {
            $url_params['target'] = $GLOBALS['target'];
        }

        /**
         * whether we come from a fresh cookie login
         */
        define('PMA_COMING_FROM_COOKIE_LOGIN', true);
        PMA_sendHeaderLocation($redirect_url . PMA_generate_common_url($url_params, '&'));
        exit();
    } // end if

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


/**
 * User is not allowed to login to MySQL -> authentication failed
 *
 * prepares error message and switches to PMA_auth() which display the error
 * and the login form
 *
 * this function MUST exit/quit the application,
 * currently doen by call to PMA_auth()
 *
 * @todo    $php_errormsg is invalid here!? it will never be set in this scope
 * @uses    $GLOBALS['server']
 * @uses    $GLOBALS['allowDeny_forbidden']
 * @uses    $GLOBALS['strAccessDenied']
 * @uses    $GLOBALS['strNoActivity']
 * @uses    $GLOBALS['strCannotLogin']
 * @uses    $GLOBALS['no_activity']
 * @uses    $cfg['LoginCookieValidity']
 * @uses    PMA_removeCookie()
 * @uses    PMA_getenv()
 * @uses    PMA_DBI_getError()
 * @uses    PMA_sanitize()
 * @uses    PMA_auth()
 * @uses    sprintf()
 * @uses    basename()
 * @access  public
 */
function PMA_auth_fails()
{
    global $conn_error;

    // Deletes password cookie and displays the login form
    PMA_removeCookie('pmaPass-' . $GLOBALS['server']);

    if (! empty($GLOBALS['allowDeny_forbidden'])) {
        $conn_error = $GLOBALS['strAccessDenied'];
    } elseif (! empty($GLOBALS['no_activity'])) {
        $conn_error = sprintf($GLOBALS['strNoActivity'], $GLOBALS['cfg']['LoginCookieValidity']);
        // Remember where we got timeout to return on same place
        if (PMA_getenv('SCRIPT_NAME')) {
            $GLOBALS['target'] = basename(PMA_getenv('SCRIPT_NAME'));
            // avoid "missing parameter: field" on re-entry
            if ('tbl_alter.php' == $GLOBALS['target']) {
                $GLOBALS['target'] = 'tbl_structure.php';
            }
        }
    } elseif (PMA_DBI_getError()) {
        $conn_error = PMA_sanitize(PMA_DBI_getError());
    } elseif (isset($php_errormsg)) {
        $conn_error = $php_errormsg;
    } else {
        $conn_error = $GLOBALS['strCannotLogin'];
    }

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

?>