Merge pull request #2453 from chillu/pulls/escape-3.1.0

Escaping 3.1

admin/code/SecurityAdmin.php

@@ -84,7 +84,7 @@ class SecurityAdmin extends LeftAndMain implements PermissionProvider {
 		));
 		$columns->setFieldFormatting(array(
 			'Breadcrumbs' => function($val, $item) {
-				return $item->getBreadcrumbs(' > ');
+				return Convert::raw2xml($item->getBreadcrumbs(' > '));
 			}
 		));
 

docs/en/changelogs/rc/3.1.0-rc3.md

@@ -0,0 +1,21 @@
+# 3.1.0-rc3
+
+## Overview
+
+### Security: XSS in CMS "Security" section (SS-2013-007)
+
+See [announcement](http://www.silverstripe.org/ss-2013-007-xss-in-cms-security-section/)
+
+### Security: XSS in form validation errors (SS-2013-008)
+
+See [announcement](http://www.silverstripe.org/ss-2013-008-xss-in-numericfield-validation/)
+
+### Security: XSS in CMS "Pages" section (SS-2013-009)
+
+See [announcement](http://www.silverstripe.org/ss-2013-009-xss-in-cms-pages-section/)
+
+### API: Form validation message no longer allow HTML
+
+Due to cross-site scripting concerns when user data is used for form messages,
+it is no longer possible to use HTML in `Form->sessionMessage()`, and consequently
+in the `FormField->validate()` API.

forms/Form.php

@@ -155,6 +155,10 @@ class Form extends RequestHandler {
 		'forTemplate',
 	);
 
+	private static $casting = array(
+		'Message' => 'Text'
+	);
+
 	/**
 	 * Create a new form, with the given fields an action buttons.
 	 * 
@@ -491,7 +495,7 @@ class Form extends RequestHandler {
 	}
 
 	/**
-	 * Add an error message to a field on this form.  It will be saved into the session
+	 * Add a plain text error message to a field on this form.  It will be saved into the session
 	 * and used the next time this form is displayed.
 	 */
 	public function addErrorMessage($fieldName, $message, $messageType) {

forms/FormField.php

@@ -93,6 +93,10 @@ class FormField extends RequestHandler {
 	 */
 	protected $attributes = array();
 
+	private static $casting = array(
+		'Message' => 'Text'
+	);
+
 	/**
 	 * Takes a fieldname and converts camelcase to spaced
 	 * words. Also resolves combined fieldnames with dot syntax

forms/TreeDropdownField.php

@@ -269,9 +269,23 @@ class TreeDropdownField extends FormField {
 				$obj->markToExpose($this->objectForKey($value));
 			}
 		}
-		$eval = '"<li id=\"selector-' . $this->getName() . '-{$child->' . $this->keyField . '}\" data-id=\"$child->'
-			. $this->keyField . '\" class=\"class-$child->class"' 
-			. ' . $child->markingClasses() . "\"><a rel=\"$child->ID\">" . $child->' . $this->labelField . ' . "</a>"';
+
+		$self = $this;
+		$escapeLabelField = ($obj->escapeTypeForField($this->labelField) != 'xml');
+		$titleFn = function(&$child) use(&$self, $escapeLabelField) {
+			$keyField = $self->keyField;
+			$labelField = $self->labelField;
+			return sprintf(
+				'<li id="selector-%s-%s" data-id="%s" class="class-%s %s"><a rel="%d">%s</a>',
+				Convert::raw2xml($self->getName()),
+				Convert::raw2xml($child->$keyField),
+				Convert::raw2xml($child->$keyField),
+				Convert::raw2xml($child->class),
+				Convert::raw2xml($child->markingClasses()),
+				(int)$child->ID,
+				$escapeLabelField ? Convert::raw2xml($child->$labelField) : $child->$labelField
+			);
+		};
 
 		// Limit the amount of nodes shown for performance reasons.
 		// Skip the check if we're filtering the tree, since its not clear how many children will
@@ -294,7 +308,7 @@ class TreeDropdownField extends FormField {
 		if($isSubTree) {
 			$html = $obj->getChildrenAsUL(
 				"",
-				$eval,
+				$titleFn,
 				null,
 				true, 
 				$this->childrenMethod,
@@ -307,7 +321,7 @@ class TreeDropdownField extends FormField {
 		} else {
 			$html = $obj->getChildrenAsUL(
 				'class="tree"',
-				$eval,
+				$titleFn,
 				null,
 				true, 
 				$this->childrenMethod,

forms/gridfield/GridFieldDataColumns.php

@@ -95,10 +95,15 @@ class GridFieldDataColumns implements GridField_ColumnProvider {
 
 	/**
 	 * Specify custom formatting for fields, e.g. to render a link instead of pure text.
+	 * 
 	 * Caution: Make sure to escape special php-characters like in a normal php-statement.
 	 * Example:	"myFieldName" => '<a href=\"custom-admin/$ID\">$ID</a>'.
+	 * 
 	 * Alternatively, pass a anonymous function, which takes two parameters:
-	 *  The value and the original list item.
+	 * The value and the original list item.
+	 *
+	 * Formatting is applied after field casting, so if you're modifying the string
+	 * to include further data through custom formatting, ensure it's correctly escaped.
 	 *
 	 * @param array $formatting
 	 */