global.php

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<?php
 
define('SQ_INORDER',0);
define('SQ_GET',1);
define('SQ_POST',2);
define('SQ_SESSION',3);
define('SQ_COOKIE',4);
define('SQ_SERVER',5);
define('SQ_FORM',6);
 
if ((bool) ini_get('register_globals') &&
    strtolower(ini_get('register_globals'))!='off') {
    foreach ($GLOBALS as $key => $value) {
        switch($key) {
        case 'HTTP_POST_VARS':
        case '_POST':
        case 'HTTP_GET_VARS':
        case '_GET':
        case 'HTTP_COOKIE_VARS':
        case '_COOKIE':
        case 'HTTP_SERVER_VARS':
        case '_SERVER':
        case 'HTTP_ENV_VARS':
        case '_ENV':
        case 'HTTP_POST_FILES':
        case '_FILES':
        case '_REQUEST':
        case 'HTTP_SESSION_VARS':
        case '_SESSION':
        case 'GLOBALS':
        case 'key':
        case 'value':
            break;
        default:
            unset($GLOBALS[$key]);
        }
    }
    // Unset variables used in foreach
    unset($GLOBALS['key']);
    unset($GLOBALS['value']);
}
 
$php_session_auto_start = ini_get('session.auto_start');
if ((bool)$php_session_auto_start && $php_session_auto_start != 'off') {
    die('SquirrelMail 1.4.x is not compatible with PHP\'s session.auto_start setting.  Please disable it at least for the location where SquirrelMail is installed.');
}
 
if (isset($_SERVER['PHP_SELF'])) {
    $_SERVER['PHP_SELF'] = htmlspecialchars($_SERVER['PHP_SELF']);
}
/*
 * same needed for QUERY_STRING because SquirrelMail
 * uses it along with PHP_SELF when using location
 * strings
 */
if (isset($_SERVER['QUERY_STRING'])) {
    $_SERVER['QUERY_STRING'] = htmlspecialchars($_SERVER['QUERY_STRING']);
}
/*
 * same needed for REQUEST_URI because it's used in php_self()
 */
if (isset($_SERVER['REQUEST_URI'])) {
    $_SERVER['REQUEST_URI'] = htmlspecialchars($_SERVER['REQUEST_URI']);
}
 
require_once(SM_PATH . 'functions/strings.php');
require_once(SM_PATH . 'config/config.php');
 
global $temporary_plugins;
if (isset($temporary_plugins)) {
    $plugins = $temporary_plugins;
}
 
$is_secure_connection = is_ssl_secured_connection();
 
if(isset($session_name) && $session_name) {
    ini_set('session.name' , $session_name);
} else {
    ini_set('session.name' , 'SQMSESSID');
}
 
ini_set('magic_quotes_runtime','0');
 
if (!(bool)ini_get('session.use_cookies') ||
    ini_get('session.use_cookies') == 'off') {
    ini_set('session.use_cookies','1');
}
 
$base_uri = sqm_baseuri();
 
sqsession_is_active();
 
/* if running with magic_quotes_gpc then strip the slashes
   from POST and GET global arrays */
 
if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc()) {
    sqstripslashes($_GET);
    sqstripslashes($_POST);
}
 
function check_php_version ($a = '0', $b = '0', $c = '0')
{
    global $SQ_PHP_VERSION;
 
    if(!isset($SQ_PHP_VERSION))
        $SQ_PHP_VERSION = substr( str_pad( preg_replace('/\D/','', PHP_VERSION), 3, '0'), 0, 3);
 
    return $SQ_PHP_VERSION >= ($a.$b.$c);
}
 
function check_sm_version($a = 0, $b = 0, $c = 0)
{
    global $SQM_INTERNAL_VERSION;
    if ( !isset($SQM_INTERNAL_VERSION) ||
         $SQM_INTERNAL_VERSION[0] < $a ||
         ( $SQM_INTERNAL_VERSION[0] == $a &&
           $SQM_INTERNAL_VERSION[1] < $b) ||
         ( $SQM_INTERNAL_VERSION[0] == $a &&
           $SQM_INTERNAL_VERSION[1] == $b &&
           $SQM_INTERNAL_VERSION[2] < $c ) ) {
        return FALSE;
    }
    return TRUE;
}
 
 
function sqstripslashes(&$array) {
    if(count($array) > 0) {
        foreach ($array as $index=>$value) {
            if (is_array($array[$index])) {
                sqstripslashes($array[$index]);
            }
            else {
                $array[$index] = stripslashes($value);
            }
        }
    }
}
 
function sq_call_function_suppress_errors($function, $args=array()) {
   $display_errors = ini_get('display_errors');
   ini_set('display_errors', '0');
   $ret = call_user_func_array($function, $args);
   ini_set('display_errors', $display_errors);
   return $ret;
}
 
function sqsession_register ($var, $name) {
 
    sqsession_is_active();
 
    $_SESSION[$name] = $var;
}
 
function sqsession_unregister ($name) {
 
    sqsession_is_active();
 
    unset($_SESSION[$name]);
 
    // starts throwing warnings in PHP 5.3.0 and is
    // removed in PHP 6 and is redundant anyway
    //session_unregister($name);
}
 
function sqsession_is_registered ($name) {
    $test_name = &$name;
    return isset($_SESSION[$test_name]);
}
 
function sqgetGlobalVar($name, &$value, $search = SQ_INORDER) {
 
    /* NOTE: DO NOT enclose the constants in the switch
       statement with quotes. They are constant values,
       enclosing them in quotes will cause them to evaluate
       as strings. */
    switch ($search) {
        /* we want the default case to be first here,
           so that if a valid value isn't specified,
           all three arrays will be searched. */
      default:
      case SQ_INORDER: // check session, post, get
      case SQ_SESSION:
        if( isset($_SESSION[$name]) ) {
            $value = $_SESSION[$name];
            return TRUE;
        } elseif ( $search == SQ_SESSION ) {
            break;
        }
      case SQ_FORM:   // check post, get
      case SQ_POST:
        if( isset($_POST[$name]) ) {
            $value = $_POST[$name];
            return TRUE;
        } elseif ( $search == SQ_POST ) {
          break;
        }
      case SQ_GET:
        if ( isset($_GET[$name]) ) {
            $value = $_GET[$name];
            return TRUE;
        }
        /* NO IF HERE. FOR SQ_INORDER CASE, EXIT after GET */
        break;
      case SQ_COOKIE:
        if ( isset($_COOKIE[$name]) ) {
            $value = $_COOKIE[$name];
            return TRUE;
        }
        break;
      case SQ_SERVER:
        if ( isset($_SERVER[$name]) ) {
            $value = $_SERVER[$name];
            return TRUE;
        }
        break;
    }
    /* if not found, return false */
    return FALSE;
}
 
function sqsession_destroy() {
 
    /*
     * php.net says we can kill the cookie by setting just the name:
     * http://www.php.net/manual/en/function.setcookie.php
     * maybe this will help fix the session merging again.
     *
     * Changed the theory on this to kill the cookies first starting
     * a new session will provide a new session for all instances of
     * the browser, we don't want that, as that is what is causing the
     * merging of sessions.
     */
 
    global $base_uri;
 
    if (isset($_COOKIE[session_name()])) {
        sqsetcookie(session_name(), $_COOKIE[session_name()], 1, $base_uri);
 
        /*
         * Make sure to kill /src and /src/ cookies, just in case there are
         * some left-over or malicious ones set in user's browser.
         * NB: Note that an attacker could try to plant a cookie for one
         *     of the /plugins/* directories.  Such cookies can block
         *     access to certain plugin pages, but they do not influence
         *     or fixate the $base_uri cookie, so we don't worry about
         *     trying to delete all of them here.
         */
        sqsetcookie(session_name(), $_COOKIE[session_name()], 1, $base_uri . 'src');
        sqsetcookie(session_name(), $_COOKIE[session_name()], 1, $base_uri . 'src/');
    }
 
    if (isset($_COOKIE['key'])) sqsetcookie('key', 'SQMTRASH', 1, $base_uri);
 
    /* Make sure new session id is generated on subsequent session_start() */
    unset($_COOKIE[session_name()]);
    unset($_GET[session_name()]);
    unset($_POST[session_name()]);
 
    $sessid = session_id();
    if (!empty( $sessid )) {
        $_SESSION = array();
        @session_destroy();
    }
 
}
 
function sqsession_is_active() {
    sqsession_start();
}
 
function sqsession_start() {
    global $base_uri;
 
    session_set_cookie_params (0, $base_uri);
    @session_start();
    // could be: sq_call_function_suppress_errors('session_start');
    $session_id = session_id();
 
    // session_starts sets the sessionid cookie but without the httponly var
    // setting the cookie again sets the httponly cookie attribute
    //
    // need to check if headers have been sent, since sqsession_is_active()
    // has become just a passthru to this function, so the sqsetcookie()
    // below is called every time, even after headers have already been sent
    //
    if (!headers_sent())
       sqsetcookie(session_name(),$session_id,false,$base_uri);
}
 
function sqsetcookie($sName, $sValue='deleted', $iExpire=0, $sPath="", $sDomain="",
                     $bSecure=false, $bHttpOnly=true, $bReplace=false) {
 
    // if we have a secure connection then limit the cookies to https only.
    global $is_secure_connection;
    if ($sName && $is_secure_connection)
        $bSecure = true;
 
    // admin config can override the restriction of secure-only cookies
    //
    // (we have to check if the value is set and default it to true if
    // not because when upgrading without re-running conf.pl, it will
    // not be found in config/config.php and thusly evaluate to false,
    // but we want to default people who upgrade to true due to security
    // implications of setting this to false)
    //
    global $only_secure_cookies;
    if (!isset($only_secure_cookies)) $only_secure_cookies = true;
    if (!$only_secure_cookies)
        $bSecure = false;
 
    if (false && check_php_version(5,2)) {
       // php 5 supports the httponly attribute in setcookie, but because setcookie seems a bit
       // broken we use the header function for php 5.2 as well. We might change that later.
       //setcookie($sName,$sValue,(int) $iExpire,$sPath,$sDomain,$bSecure,$bHttpOnly);
    } else {
        if (!empty($sDomain)) {
            // Fix the domain to accept domains with and without 'www.'.
            if (strtolower(substr($sDomain, 0, 4)) == 'www.')  $sDomain = substr($sDomain, 4);
            $sDomain = '.' . $sDomain;
 
            // Remove port information.
            $Port = strpos($sDomain, ':');
            if ($Port !== false)  $sDomain = substr($sDomain, 0, $Port);
        }
        if (!$sValue) $sValue = 'deleted';
        header('Set-Cookie: ' . rawurlencode($sName) . '=' . rawurlencode($sValue)
                            . (empty($iExpire) ? '' : '; expires=' . gmdate('D, d-M-Y H:i:s', $iExpire) . ' GMT')
                            . (empty($sPath) ? '' : '; path=' . $sPath)
                            . (empty($sDomain) ? '' : '; domain=' . $sDomain)
                            . (!$bSecure ? '' : '; secure')
                            . (!$bHttpOnly ? '' : '; HttpOnly'), $bReplace);
    }
}
 
function is_ssl_secured_connection()
{ 
    global $sq_ignore_http_x_forwarded_headers, $sq_https_port;
    $https_env_var = getenv('HTTPS');
    if ($sq_ignore_http_x_forwarded_headers
     || !sqgetGlobalVar('HTTP_X_FORWARDED_PROTO', $forwarded_proto, SQ_SERVER))
        $forwarded_proto = '';
    if (empty($sq_https_port)) // won't work with port 0 (zero)
       $sq_https_port = 443;
    if ((isset($https_env_var) && strcasecmp($https_env_var, 'on') === 0)
     || (sqgetGlobalVar('HTTPS', $https, SQ_SERVER) && !empty($https)
      && strcasecmp($https, 'off') !== 0)
     || (strcasecmp($forwarded_proto, 'https') === 0)
     || (sqgetGlobalVar('SERVER_PORT', $server_port, SQ_SERVER)
      && $server_port == $sq_https_port))
        return TRUE;
    return FALSE;
}
 
function file_has_long_lines($filename, $max_length) {
 
    $FILE = @fopen($filename, 'rb');
 
    if ($FILE) {
        while (!feof($FILE)) {
            $buffer = fgets($FILE, 4096);
            if (strlen($buffer) > $max_length) {
                fclose($FILE);
                return TRUE;
            }
        }
        fclose($FILE);
    }
 
    return FALSE;
}