X-Git-Url: https://vcs.fsf.org/?a=blobdiff_plain;f=functions%2Fglobal.php;h=84db5ec529fdc020090151ac540d10da04af4976;hb=bb50b50818e1eb3b2ff8f8c49883c1a7f19707e5;hp=7aa68edec116e81ae9b7994e6bb6e2c78529dd92;hpb=61d9ec71d533a2447cecd4b00173fe6f555f2d07;p=squirrelmail.git

diff --git a/functions/global.php b/functions/global.php
index 7aa68ede..84db5ec5 100644
--- a/functions/global.php
+++ b/functions/global.php
@@ -1,74 +1,292 @@
 <?php
 
 /**
- * globals.php
+ * global.php
  *
- * Copyright (c) 1999-2002 The SquirrelMail Project Team
+ * Copyright (c) 1999-2004 The SquirrelMail Project Team
  * Licensed under the GNU GPL. For full terms see the file COPYING.
  *
  * This includes code to update < 4.1.0 globals to the newer format 
- * It also has two session register functions that work across various
+ * It also has some session register functions that work across various
  * php versions. 
  *
  * $Id$
+ * @package squirrelmail
  */
 
+/** Bring in the config file. */
+require_once(SM_PATH . 'config/config.php');
 
-/* convert old-style superglobals to current method
- * this is executed if you are running PHP 4.0.x.
- * it is run via a require_once directive in validate.php 
- * and redirect.php. Patch submitted by Ray Black.
- */ 
-
-if ( (float)substr(PHP_VERSION,0,3) < 4.1 ) {
-  global $_COOKIE, $_ENV, $_FILES, $_GET, $_POST, $_SERVER, $_SESSION;
-  global $HTTP_COOKIE_VARS, $HTTP_ENV_VARS, $HTTP_POST_FILES, $HTTP_GET_VARS,
-         $HTTP_POST_VARS, $HTTP_SERVER_VARS, $HTTP_SESSION_VARS;
-  $_COOKIE  =& $HTTP_COOKIE_VARS;
-  $_ENV     =& $HTTP_ENV_VARS;
-  $_FILES   =& $HTTP_POST_FILES;
-  $_GET     =& $HTTP_GET_VARS;
-  $_POST    =& $HTTP_POST_VARS;
-  $_SERVER  =& $HTTP_SERVER_VARS;
-  $_SESSION =& $HTTP_SESSION_VARS;
+/** set the name of the session cookie */
+if(isset($session_name) && $session_name) {  
+    ini_set('session.name' , $session_name);  
+} else {  
+    ini_set('session.name' , 'SQMSESSID');  
 }
 
-function sqsession_register ($var, $name) {
-    $rg = ini_get('register_globals');
-    if ( (float)substr(PHP_VERSION,0,3) < 4.1 && empty($rg)) {
-        global $HTTP_SESSION_VARS;
-        $HTTP_SESSION_VARS["$name"] = $var;
-    }
-    else {
-        session_register("$name");
+/** 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;
+
+sqsession_is_active();
+
+/* 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);
+}
+
+/* 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']);
+
+/** 
+ * 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')             
+{
+    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);
+}
+
+/**
+ * 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[1] < $b ||
+	 ( $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) {
-    $rg = ini_get('register_globals');
-    if ( (float)substr(PHP_VERSION,0,3) < 4.1 && empty($rg)) {
-    global $HTTP_SESSION_VARS;
-        unset($HTTP_SESSION_VARS["$name"]);
-    }
-    else {
-        session_unregister("$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;
 }
 
+
+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);
+
 /**
- *  Search for the var $name in $_SESSION, $_POST, $_GET
- *  (in that order) and register it as a global var.
+ * Search for the var $name in $_SESSION, $_POST, $_GET,
+ * $_COOKIE, or $_SERVER and set it in provided var. 
+ *
+ * If $search is not provided,  or == SQ_INORDER, it will search
+ * $_SESSION, then $_POST, then $_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!
+ *
+ * @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 sqextractGlobalVar ($name) {
-    global $_SESSION, $_GET, $_POST, $$name;
+function sqgetGlobalVar($name, &$value, $search = SQ_INORDER) {
 
-    if( isset($_SESSION[$name]) ) {
-        $$name = $_SESSION[$name];
+    /* NOTE: DO NOT enclose the constants in the switch
+       statement with quotes. They are constant values,
+       enclosing them in quotes will cause them to evaluate
+       as strings. */
+    switch ($search) {
+        /* we want the default case to be first here,  
+	   so that if a valid value isn't specified, 
+	   all three arrays will be searched. */
+      default:
+      case SQ_INORDER: // check session, post, get
+      case SQ_SESSION:
+        if( isset($_SESSION[$name]) ) {
+            $value = $_SESSION[$name];
+            return TRUE;
+        } elseif ( $search == SQ_SESSION ) {
+            break;
+        }
+      case SQ_FORM:   // check post, get
+      case SQ_POST:
+        if( isset($_POST[$name]) ) {
+            $value = $_POST[$name];
+            return TRUE;
+        } elseif ( $search == SQ_POST ) {
+          break;
+        }
+      case SQ_GET:
+        if ( isset($_GET[$name]) ) {
+            $value = $_GET[$name];
+            return TRUE;
+        } 
+        /* NO IF HERE. FOR SQ_INORDER CASE, EXIT after GET */
+        break;
+      case SQ_COOKIE:
+        if ( isset($_COOKIE[$name]) ) {
+            $value = $_COOKIE[$name];
+            return TRUE; 
+        }
+        break;
+      case SQ_SERVER:
+        if ( isset($_SERVER[$name]) ) {
+            $value = $_SERVER[$name];
+            return TRUE;
+        }
+        break;
     }
-    if( isset($_POST[$name]) ) {
-        $$name = $_POST[$name];
+    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()])) setcookie(session_name(), '', time() - 5, $base_uri);
+    if (isset($_COOKIE['username'])) setcookie('username','',time() - 5,$base_uri);
+    if (isset($_COOKIE['key'])) setcookie('key','',time() - 5,$base_uri);
+
+    $sessid = session_id();
+    if (!empty( $sessid )) {
+        $_SESSION = array();
+        @session_destroy();
     }
-    else if ( isset($_GET[$name]) ) {
-        $$name =  $_GET[$name];
+
+}
+
+/**
+ * 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 ) ) {
+        session_start();
     }
 }
+
+
 ?>