Change file permissions for directories and respect umask for written files.

Fixes #548
Fixes #819

CHANGELOG.md

@@ -13,7 +13,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Include docs and demo in the releases [#799](https://github.com/smarty-php/smarty/issues/799)
 - Using PHP functions as modifiers now triggers a deprecation notice because we will drop support for this in the next major release [#813](https://github.com/smarty-php/smarty/issues/813) 
 -  Dropped remaining references to removed PHP-support in Smarty 4 from docs, lexer and security class. [#816](https://github.com/smarty-php/smarty/issues/816)
-
+- Support umask when writing (template) files and set dir permissions to 777 [#548](https://github.com/smarty-php/smarty/issues/548) [#819](https://github.com/smarty-php/smarty/issues/819) 
+ 
 ### Fixed
 - Output buffer is now cleaned for internal PHP errors as well, not just for Exceptions [#514](https://github.com/smarty-php/smarty/issues/514)
 - Fixed recursion and out of memory errors when caching in complicated template set-ups using inheritance and includes [#801](https://github.com/smarty-php/smarty/pull/801)
@@ -24,6 +25,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Adapt Smarty upper/lower functions to be codesafe (e.g. for Turkish locale) [#586](https://github.com/smarty-php/smarty/pull/586)
 - Bug fix for underscore and limited length in template name in custom resources [#581](https://github.com/smarty-php/smarty/pull/581)
 
+
 ## [4.2.1] - 2022-09-14
 
 ### Security

libs/sysplugins/smarty_internal_runtime_writefile.php

@@ -29,7 +29,6 @@ class Smarty_Internal_Runtime_WriteFile
     {
         $_error_reporting = error_reporting();
         error_reporting($_error_reporting & ~E_NOTICE & ~E_WARNING);
-        $old_umask = umask(0);
         $_dirpath = dirname($_filepath);
         // if subdirs, create dir structure
         if ($_dirpath !== '.') {
@@ -37,7 +36,7 @@ class Smarty_Internal_Runtime_WriteFile
             // loop if concurrency problem occurs
             // see https://bugs.php.net/bug.php?id=35326
             while (!is_dir($_dirpath)) {
-                if (@mkdir($_dirpath, 0771, true)) {
+                if (@mkdir($_dirpath, 0777, true)) {
                     break;
                 }
                 clearstatcache();
@@ -85,8 +84,7 @@ class Smarty_Internal_Runtime_WriteFile
             throw new SmartyException("unable to write file {$_filepath}");
         }
         // set file permissions
-        chmod($_filepath, 0644);
-        umask($old_umask);
+        @chmod($_filepath, 0666 & ~umask());
         error_reporting($_error_reporting);
         return true;
     }