Merge branch 'xss_and_redir_patch' of git://github.com/PercussiveElbow/BookStack into xss_and_redirect

app/Entities/Managers/PageContent.php

@@ -296,6 +296,24 @@ class PageContent
             $scriptElem->parentNode->removeChild($scriptElem);
         }
 
+        // Remove clickable links to JavaScript URI
+        $badLinks = $xPath->query('//*[contains(@href, \'javascript:\')]');
+        foreach ($badLinks as $badLink) {
+            $badLink->parentNode->removeChild($badLink);
+        }
+
+        // Remove forms with calls to JavaScript URI
+        $badForms = $xPath->query('//*[contains(@action, \'javascript:\')] | //*[contains(@formaction, \'javascript:\')]');
+        foreach ($badForms as $badForm) {
+            $badForm->parentNode->removeChild($badForm);
+        }
+
+        // Remove meta tag to prevent external redirects
+        $metaTags = $xPath->query('//meta[contains(@content, \'url\')]');
+        foreach ($metaTags as $metaTag) {
+            $metaTag->parentNode->removeChild($metaTag);
+        }
+
         // Remove data or JavaScript iFrames
         $badIframes = $xPath->query('//*[contains(@src, \'data:\')] | //*[contains(@src, \'javascript:\')] | //*[@srcdoc]');
         foreach ($badIframes as $badIframe) {

dev/docker/entrypoint.node.sh

@@ -5,4 +5,4 @@ set -e
 npm install
 npm rebuild node-sass
 
-exec npm run watch
+SHELL=/bin/sh exec npm run watch

package.json

@@ -5,7 +5,7 @@
     "build:css:watch": "sass ./resources/sass:./public/dist --watch",
     "build:css:production": "sass ./resources/sass:./public/dist -s compressed",
     "build:js:dev": "esbuild --bundle ./resources/js/index.js --outfile=public/dist/app.js --sourcemap --target=es2019 --main-fields=module,main",
-    "build:js:watch": "chokidar \"./resources/**/*.js\" -c \"npm run build:js:dev\"",
+    "build:js:watch": "chokidar --initial \"./resources/**/*.js\" -c \"npm run build:js:dev\"",
     "build:js:production": "NODE_ENV=production esbuild --bundle ./resources/js/index.js --outfile=public/dist/app.js --sourcemap --target=es2019 --main-fields=module,main --minify",
     "build": "npm-run-all --parallel build:*:dev",
     "production": "npm-run-all --parallel build:*:production",

tests/Entity/PageContentTest.php

@@ -159,6 +159,72 @@ class PageContentTest extends TestCase
 
     }
 
+    public function test_javascript_uri_links_are_removed()
+    {
+        $checks = [
+            '<a id="xss" href="javascript:alert(document.cookie)>Click me</a>',
+            '<a id="xss" href="javascript: alert(document.cookie)>Click me</a>'
+        ];
+
+        $this->asEditor();
+        $page = Page::first();
+
+        foreach ($checks as $check) {
+            $page->html = $check;
+            $page->save();
+
+            $pageView = $this->get($page->getUrl());
+            $pageView->assertStatus(200);
+            $pageView->assertElementNotContains('.page-content', '<a id="xss">');
+            $pageView->assertElementNotContains('.page-content', 'href=javascript:');
+        }
+    }
+    public function test_form_actions_with_javascript_are_removed()
+    {
+        $checks = [
+            '<form><input id="xss" type=submit formaction=javascript:alert(document.domain) value=Submit><input></form>',
+            '<form ><button id="xss" formaction=javascript:alert(document.domain)>Click me</button></form>',
+            '<form id="xss" action=javascript:alert(document.domain)><input type=submit value=Submit></form>'
+        ];
+
+        $this->asEditor();
+        $page = Page::first();
+
+        foreach ($checks as $check) {
+            $page->html = $check;
+            $page->save();
+
+            $pageView = $this->get($page->getUrl());
+            $pageView->assertStatus(200);
+            $pageView->assertElementNotContains('.page-content', '<button id="xss"');
+            $pageView->assertElementNotContains('.page-content', '<input id="xss"');
+            $pageView->assertElementNotContains('.page-content', '<form id="xss"');
+            $pageView->assertElementNotContains('.page-content', 'action=javascript:');
+            $pageView->assertElementNotContains('.page-content', 'formaction=javascript:');
+        }
+    }
+    
+    public function test_metadata_redirects_are_removed()
+    {
+        $checks = [
+            '<meta http-equiv="refresh" content="0; url=//external_url">',
+        ];
+
+        $this->asEditor();
+        $page = Page::first();
+
+        foreach ($checks as $check) {
+            $page->html = $check;
+            $page->save();
+
+            $pageView = $this->get($page->getUrl());
+            $pageView->assertStatus(200);
+            $pageView->assertElementNotContains('.page-content', '<meta>');
+            $pageView->assertElementNotContains('.page-content', '</meta>');
+            $pageView->assertElementNotContains('.page-content', 'content=');
+            $pageView->assertElementNotContains('.page-content', 'external_url');
+        }
+    }
     public function test_page_inline_on_attributes_removed_by_default()
     {
         $this->asEditor();