Add change in regex for PRCE (PHP < 7.3)

Fixes #794

CHANGELOG.md

@@ -6,8 +6,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixes
+- Fixed use of `rand()` without a parameter in math function [#794](https://github.com/smarty-php/smarty/issues/794)
+
+## [3.1.46] - 2022-08-01
+
 ### Fixed
 - Fixed problems with smarty_mb_str_replace [#549](https://github.com/smarty-php/smarty/issues/549)
+- Fixed second parameter of unescape modifier not working [#777](https://github.com/smarty-php/smarty/issues/777)
 
 ## [3.1.45] - 2022-05-17
 

libs/Smarty.class.php

@@ -111,7 +111,7 @@ class Smarty extends Smarty_Internal_TemplateBase
     /**
      * smarty version
      */
-    const SMARTY_VERSION = '3.1.45';
+    const SMARTY_VERSION = '3.1.46';
     /**
      * define variable scopes
      */

libs/plugins/function.math.php

@@ -70,7 +70,7 @@ function smarty_function_math($params, $template)
     $number = '(?:\d+(?:[,.]\d+)?|pi|π)'; // What is a number
     $functionsOrVars = '((?:0x[a-fA-F0-9]+)|([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*))';
     $operators = '[,+\/*\^%-]'; // Allowed math operators
-    $regexp = '/^(('.$number.'|'.$functionsOrVars.'|('.$functionsOrVars.'\s*\((?1)+\)|\((?1)+\)))(?:'.$operators.'(?1))?)+$/';
+    $regexp = '/^(('.$number.'|'.$functionsOrVars.'|('.$functionsOrVars.'\s*\((?1)*\)|\((?1)*\)))(?:'.$operators.'(?1))?)+$/';
 
     if (!preg_match($regexp, $equation)) {
         trigger_error("math: illegal characters", E_USER_WARNING);

libs/plugins/modifiercompiler.unescape.php

@@ -14,20 +14,28 @@
  * @author Rodney Rehm
  *
  * @param array $params parameters
+ * @param Smarty_Internal_TemplateCompilerBase $compiler
  *
  * @return string with compiled code
  */
-function smarty_modifiercompiler_unescape($params)
+function smarty_modifiercompiler_unescape($params, Smarty_Internal_TemplateCompilerBase $compiler)
 {
-    if (!isset($params[ 1 ])) {
-        $params[ 1 ] = 'html';
-    }
+    $compiler->template->_checkPlugins(
+        array(
+            array(
+                'function' => 'smarty_literal_compiler_param',
+                'file'     => SMARTY_PLUGINS_DIR . 'shared.literal_compiler_param.php'
+            )
+        )
+    );
+
+    $esc_type = smarty_literal_compiler_param($params, 1, 'html');
+
     if (!isset($params[ 2 ])) {
         $params[ 2 ] = '\'' . addslashes(Smarty::$_CHARSET) . '\'';
-    } else {
-        $params[ 2 ] = "'{$params[ 2 ]}'";
     }
-    switch (trim($params[ 1 ], '"\'')) {
+
+    switch ($esc_type) {
         case 'entity':
         case 'htmlall':
             if (Smarty::$_MBSTRING) {

tests/UnitTests/TemplateSource/TagTests/PluginModifier/PluginModifierUnescapeTest.php

@@ -63,6 +63,11 @@ class PluginModifierUnescapeTest extends PHPUnit_Smarty
         $tpl = $this->smarty->createTemplate('string:{"' . $encoded . '"|unescape:"url"}');
         $this->assertEquals($result, $this->smarty->fetch($tpl));
     }
-}
 
-?>
+    public function testCharset()
+    {
+        $tpl = $this->smarty->createTemplate("string:{''Stiff Opposition Expected to Casketless Funeral Plan''|unescape:'htmlall':'utf-8'}");
+        $this->assertEquals("'Stiff Opposition Expected to Casketless Funeral Plan'", $this->smarty->fetch($tpl));
+    }
+
+}

tests/UnitTests/TemplateSource/ValueTests/Math/MathTest.php

@@ -162,4 +162,12 @@ class MathTest extends PHPUnit_Smarty
 		$this->assertEquals($expected, $this->smarty->fetch($tpl));
 	}
 
+	public function testRand()
+	{
+		$tpl = $this->smarty->createTemplate('eval:{$x = "0"}{math equation="x * rand()" x=$x}');
+		// this assertion may seem silly, but it serves to prove that using rand() without a parameter
+		// will not trigger a security error (see https://github.com/smarty-php/smarty/issues/794)
+		$this->assertEquals("0", $this->smarty->fetch($tpl));
+	}
+
 }