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<?php
/**
* global.php
*
* This includes code to update < 4.1.0 globals to the newer format
* It also has some session register functions that work across various
* php versions.
*
* @copyright © 1999-2006 The SquirrelMail Project Team
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @version $Id: global.php,v 1.64 2006/01/28 16:06:12 stekkel Exp $
* @package squirrelmail
*/
/**
*/
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);
/**
* returns true if current php version is at mimimum a.b.c
*
* Called: check_php_version(4,1)
* @param int a major version number
* @param int b minor version number
* @param int c release number
* @return bool
*/
function check_php_version ($a = '0', $b = '0', $c = '0')
{
return version_compare ( PHP_VERSION, "$a.$b.$c", 'ge' );
}
/**
* returns true if the current internal SM version is at minimum a.b.c
* These are plain integer comparisons, as our internal version is
* constructed by us, as an array of 3 ints.
*
* Called: check_sm_version(1,3,3)
* @param int a major version number
* @param int b minor version number
* @param int c release number
* @return bool
*/
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] < $c ) ) {
return FALSE;
}
return TRUE;
}
/**
* Recursively strip slashes from the values of an array.
* @param array array the array to strip, passed by reference
* @return void
*/
function sqstripslashes(&$array) {
if(count($array) > 0) {
foreach ($array as $index=>$value) {
if (is_array($array[$index])) {
sqstripslashes($array[$index]);
}
else {
$array[$index] = stripslashes($value);
}
}
}
}
/**
* Add a variable to the session.
* @param mixed $var the variable to register
* @param string $name the name to refer to this variable
* @return void
*/
function sqsession_register ($var, $name) {
sqsession_is_active();
$_SESSION["$name"] = $var;
session_register("$name");
}
/**
* Delete a variable from the session.
* @param string $name the name of the var to delete
* @return void
*/
function sqsession_unregister ($name) {
sqsession_is_active();
unset($_SESSION[$name]);
session_unregister("$name");
}
/**
* Checks to see if a variable has already been registered
* in the session.
* @param string $name the name of the var to check
* @return bool whether the var has been registered
*/
function sqsession_is_registered ($name) {
$test_name = &$name;
$result = false;
if (isset($_SESSION[$test_name])) {
$result = true;
}
return $result;
}
/**
* Search for the var $name in $_SESSION, $_POST, $_GET, $_COOKIE, or $_SERVER
* and set it in provided var.
*
* If $search is not provided, or if it is SQ_INORDER, it will search $_SESSION,
* then $_POST, then $_GET. If $search is SQ_FORM it will search $_POST and
* $_GET. Otherwise, use one of the defined constants to look for a var in one
* place specifically.
*
* Note: $search is an int value equal to one of the constants defined above.
*
* Example:
* sqgetGlobalVar('username',$username,SQ_SESSION);
* // No quotes around last param, it's a constant - not a string!
*
* @param string name the name of the var to search
* @param mixed value the variable to return
* @param int search constant defining where to look
* @return bool whether variable is found.
*/
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;
}
/* Nothing found, return FALSE */
return FALSE;
}
/**
* Deletes an existing session, more advanced than the standard PHP
* session_destroy(), it explicitly deletes the cookies and global vars.
*/
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(), '', 0, $base_uri);
if (isset($_COOKIE['username'])) sqsetcookie('username','',0,$base_uri);
if (isset($_COOKIE['key'])) sqsetcookie('key','',0,$base_uri);
$sessid = session_id();
if (!empty( $sessid )) {
$_SESSION = array();
@session_destroy();
}
}
/**
* Function to verify a session has been started. If it hasn't
* start a session up. php.net doesn't tell you that $_SESSION
* (even though autoglobal), is not created unless a session is
* started, unlike $_POST, $_GET and such
*/
function sqsession_is_active() {
$sessid = session_id();
if ( empty( $sessid ) ) {
sqsession_start();
}
}
/**
* Function to start the session and store the cookie with the session_id as
* HttpOnly cookie which means that the cookie isn't accessible by javascript
* (IE6 only)
*/
function sqsession_start() {
global $PHP_SELF;
$dirs = array('|src/.*|', '|plugins/.*|', '|functions/.*|');
$repl = array('', '', '');
$base_uri = preg_replace($dirs, $repl, $PHP_SELF);
session_start();
$sessid = session_id();
// session_starts sets the sessionid cookie buth without the httponly var
// setting the cookie again sets the httponly cookie attribute
sqsetcookie(session_name(),$sessid,false,$base_uri);
}
/**
* Set a cookie
* @param string $sName The name of the cookie.
* @param string $sValue The value of the cookie.
* @param int $iExpire The time the cookie expires. This is a Unix timestamp so is in number of seconds since the epoch.
* @param string $sPath The path on the server in which the cookie will be available on.
* @param string $sDomain The domain that the cookie is available.
* @param boolean $bSecure Indicates that the cookie should only be transmitted over a secure HTTPS connection.
* @param boolean $bHttpOnly Disallow JS to access the cookie (IE6 only)
* @return void
*/
function sqsetcookie($sName,$sValue,$iExpire=false,$sPath="",$sDomain="",$bSecure=false,$bHttpOnly=true) {
$sHeader = "Set-Cookie: $sName=$sValue";
if ($sPath) {
$sHeader .= "; path=$sPath";
}
if ($iExpire !== false) {
$sHeader .= "; Max-Age=$iExpire";
// php uses Expire header, also add the expire header
$sHeader .= "; expires=". gmdate('D, d-M-Y H:i:s T',$iExpire);
}
if ($sDomain) {
$sHeader .= "; Domain=$sDomain";
}
if ($bSecure) {
$sHeader .= "; Secure";
}
if ($bHttpOnly) {
$sHeader .= "; HttpOnly";
}
// $sHeader .= "; Version=1";
header($sHeader);
}
/**
* php_self
*
* Creates an URL for the page calling this function, using either the PHP global
* REQUEST_URI, or the PHP global PHP_SELF with QUERY_STRING added. Before 1.5.1
* function was stored in function/strings.php.
*
* @return string the complete url for this page
* @since 1.2.3
*/
function php_self () {
if ( sqgetGlobalVar('REQUEST_URI', $req_uri, SQ_SERVER) && !empty($req_uri) ) {
return $req_uri;
}
if ( sqgetGlobalVar('PHP_SELF', $php_self, SQ_SERVER) && !empty($php_self) ) {
// need to add query string to end of PHP_SELF to match REQUEST_URI
//
if ( sqgetGlobalVar('QUERY_STRING', $query_string, SQ_SERVER) && !empty($query_string) ) {
$php_self .= '?' . $query_string;
}
return $php_self;
}
return '';
}
/** set the name of the session cookie */
if(isset($session_name) && $session_name) {
ini_set('session.name' , $session_name);
} else {
ini_set('session.name' , 'SQMSESSID');
}
/**
* If magic_quotes_runtime is on, SquirrelMail breaks in new and creative ways.
* Force magic_quotes_runtime off.
* tassium@squirrelmail.org - I put it here in the hopes that all SM code includes this.
* If there's a better place, please let me know.
*/
ini_set('magic_quotes_runtime','0');
/* Since we decided all IMAP servers must implement the UID command as defined in
* the IMAP RFC, we force $uid_support to be on.
*/
global $uid_support;
$uid_support = true;
/* if running with magic_quotes_gpc then strip the slashes
from POST and GET global arrays */
if (get_magic_quotes_gpc()) {
sqstripslashes($_GET);
sqstripslashes($_POST);
}
/**
* If register_globals are on, unregister globals.
* Code requires PHP 4.1.0 or newer.
*/
if ((bool) @ini_get('register_globals')) {
/**
* Remove all globals from $_GET, $_POST, and $_COOKIE.
*/
foreach ($_REQUEST as $key => $value) {
unset($GLOBALS[$key]);
}
/**
* Remove globalized $_FILES variables
* Before 4.3.0 $_FILES are included in $_REQUEST.
* Unglobalize them in separate call in order to remove dependency
* on PHP version.
*/
foreach ($_FILES as $key => $value) {
unset($GLOBALS[$key]);
// there are three undocumented $_FILES globals.
unset($GLOBALS[$key.'_type']);
unset($GLOBALS[$key.'_name']);
unset($GLOBALS[$key.'_size']);
}
/**
* Remove globalized environment variables.
*/
foreach ($_ENV as $key => $value) {
unset($GLOBALS[$key]);
}
/**
* Remove globalized server variables.
*/
foreach ($_SERVER as $key => $value) {
unset($GLOBALS[$key]);
}
}
/* strip any tags added to the url from PHP_SELF.
This fixes hand crafted url XXS expoits for any
page that uses PHP_SELF as the FORM action */
$_SERVER['PHP_SELF'] = strip_tags($_SERVER['PHP_SELF']);
$PHP_SELF = php_self();
sqsession_is_active();
/**
* Remove globalized session data in rg=on setups
*/
if ((bool) @ini_get('register_globals')) {
foreach ($_SESSION as $key => $value) {
unset($GLOBALS[$key]);
}
}
?>
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