X-Git-Url: https://vcs.fsf.org/?p=squirrelmail.git;a=blobdiff_plain;f=functions%2Fpage_header.php;h=f3fc1e68199275df4e51ef05a11c3009f4f88164;hp=1311893eda3dfc98f486121306665b1c7a27cbff;hb=c4faef335b2362c81b8ebf026d4066c12d70536c;hpb=1977ab5587905d225c6288141b82f7a6e3d29d02

diff --git a/functions/page_header.php b/functions/page_header.php
index 1311893e..f3fc1e68 100644
--- a/functions/page_header.php
+++ b/functions/page_header.php
@@ -5,7 +5,7 @@
  *
  * Prints the page header (duh)
  *
- * @copyright 1999-2010 The SquirrelMail Project Team
+ * @copyright 1999-2020 The SquirrelMail Project Team
  * @license http://opensource.org/licenses/gpl-license.php GNU Public License
  * @version $Id$
  * @package squirrelmail
@@ -24,9 +24,12 @@ include_once(SM_PATH . 'functions/imap_mailbox.php');
  * @param string xtra extra HTML to insert into the header
  * @param bool do_hook whether to execute hooks, default true
  * @param bool frames generate html frameset doctype (since 1.5.1)
+ * @param bool $browser_cache_ok When TRUE, it's OK to leave out the
+ *                               no-cache browser headers (OPTIONAL;
+ *                               default = FALSE, send no-cache headers)
  * @return void
  */
-function displayHtmlHeader( $title = 'SquirrelMail', $xtra = '', $do_hook = TRUE, $frames = FALSE ) {
+function displayHtmlHeader( $title = 'SquirrelMail', $xtra = '', $do_hook = TRUE, $frames = FALSE, $browser_cache_ok=FALSE ) {
     global $squirrelmail_language, $sTemplateID, $oErrorHandler, $oTemplate;
 
     if ( !sqgetGlobalVar('base_uri', $base_uri, SQ_SESSION) ) {
@@ -34,23 +37,61 @@ function displayHtmlHeader( $title = 'SquirrelMail', $xtra = '', $do_hook = TRUE
     }
     global $custom_css, $pageheader_sent, $theme, $theme_default, $text_direction,
         $default_fontset, $chosen_fontset, $default_fontsize, $chosen_fontsize, 
-        $chosen_theme, $chosen_theme_path, $user_themes, $user_theme_default;
+        $chosen_theme, $chosen_theme_path, $user_themes, $user_theme_default,
+        $head_tag_extra;
 
-    /* add no cache headers here */
+    // add no cache headers here
+    //
+    if (!$browser_cache_ok) {
 //FIXME: should change all header() calls in SM core to use $oTemplate->header()!!
-    $oTemplate->header('Pragma: no-cache'); // http 1.0 (rfc1945)
-    $oTemplate->header('Cache-Control: private, no-cache, no-store'); // http 1.1 (rfc2616)
+        $oTemplate->header('Pragma: no-cache'); // http 1.0 (rfc1945)
+        $oTemplate->header('Cache-Control: private, no-cache, no-store, must-revalidate, max-age=0'); // http 1.1 (rfc2616)
+        $oTemplate->header('Expires: Sat, 1 Jan 2000 00:00:00 GMT');
+//TODO: is this needed? $oTemplate->header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . 'GMT');
+    }
+    /* prevent information leakage about read emails by forbidding Firefox
+     * to do preemptive DNS requests for any links in the message body. */
+    $oTemplate->header('X-DNS-Prefetch-Control: off');
 
     // don't show version as a security measure
     //$oTemplate->header('X-Powered-By: SquirrelMail/' . SM_VERSION, FALSE);
     $oTemplate->header('X-Powered-By: SquirrelMail', FALSE);
 
+    // prevent clickjack attempts
+// FIXME: should we use DENY instead?  We can also make this a configurable value, including giving the admin the option of removing this entirely in case they WANT to be framed by an external domain
+    $oTemplate->header('X-Frame-Options: SAMEORIGIN');
+
+    // prevent clickjack attempts using JavaScript for browsers that
+    // don't support the X-Frame-Options header...
+    // we check to see if we are *not* the top page, and if not, check
+    // whether or not the top page is in the same domain as we are...
+    // if not, log out immediately -- this is an attempt to do the same
+    // thing that the X-Frame-Options does using JavaScript (never a good
+    // idea to rely on JavaScript-based solutions, though)
+//FIXME: is it a problem that we still force the clickjack protection code whether or not JavaScript is supported or desired by the user?
+    $header_tags = '<script type="text/javascript" language="JavaScript">'
+       . "\n<!--\n"
+       . 'if (self != top) { try { if (document.domain != top.document.domain) {'
+       . ' throw "Clickjacking security violation! Please log out immediately!"; /* this code should never execute - exception should already have been thrown since it\'s a security violation in this case to even try to access top.document.domain (but it\'s left here just to be extra safe) */ } } catch (e) { self.location = "'
+       . sqm_baseuri() . 'src/signout.php"; top.location = "'
+       . sqm_baseuri() . 'src/signout.php" } }'
+       . "\n// -->\n</script>\n";
+
     $oTemplate->assign('frames', $frames);
     $oTemplate->assign('lang', $squirrelmail_language);
 
-    $header_tags = '';
+    $header_tags .= "<meta name=\"robots\" content=\"noindex,nofollow\" />\n"
 
-    $header_tags .= "<meta name=\"robots\" content=\"noindex,nofollow\" />\n";
+    // For adding a favicon or anything else that should be inserted in *ALL* <head> for *ALL* documents,
+    // define $head_tag_extra in config/config_local.php
+    // The string "###SM BASEURI###" will be replaced with the base URI for this SquirrelMail installation.
+    // When not defined, a default is provided that displays the default favicon.ico.
+    // If you override this and still want to use the default favicon.ico, you'll have to include the following
+    // following in your $head_tag_extra string:
+    // $head_tag_extra = '<link rel="shortcut icon" href="###SM BASEURI###favicon.ico" />...<YOUR CONTENT HERE>...';
+    //
+    . (empty($head_tag_extra) ? '<link rel="shortcut icon" href="' . sqm_baseuri() . 'favicon.ico" />'
+    : str_replace('###SM BASEURI###', sqm_baseuri(), $head_tag_extra));
 
     $used_fontset = (!empty($chosen_fontset) ? $chosen_fontset : $default_fontset);
     $used_fontsize = (!empty($chosen_fontsize) ? $chosen_fontsize : $default_fontsize);
@@ -255,7 +296,7 @@ function displayPageHeader($color, $mailbox='', $sHeaderJs='', $sOnload = '') {
         * this explains the imap_mailbox.php dependency. We should instead store
         * the selected mailbox in the session and fallback to the session var.
         */
-        $shortBoxName = htmlspecialchars(imap_utf7_decode_local(
+        $shortBoxName = sm_encode_html_special_chars(imap_utf7_decode_local(
                     readShortMailboxName($mailbox, $delimiter)));
         if (getPref($data_dir, $username, 'translate_special_folders')) {
             global $sent_folder, $trash_folder, $draft_folder;