1 files changed, 133 insertions, 0 deletions
diff --git a/dom/security/DOMSecurityMonitor.cpp b/dom/security/DOMSecurityMonitor.cpp
new file mode 100644
index 0000000000..0e66e3e1d3
--- /dev/null
+++ b/dom/security/DOMSecurityMonitor.cpp
@@ -0,0 +1,133 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "DOMSecurityMonitor.h"
+#include "nsContentUtils.h"
+
+#include "nsIChannel.h"
+#include "nsILoadInfo.h"
+#include "nsIPrincipal.h"
+#include "nsIURI.h"
+#include "nsJSUtils.h"
+
+#include "mozilla/StaticPrefs_dom.h"
+
+/* static */
+void DOMSecurityMonitor::AuditParsingOfHTMLXMLFragments(
+    nsIPrincipal* aPrincipal, const nsAString& aFragment) {
+  // if the fragment parser (e.g. innerHTML()) is not called in chrome: code
+  // or any of our about: pages, then there is nothing to do here.
+  if (!aPrincipal->IsSystemPrincipal() && !aPrincipal->SchemeIs("about")) {
+    return;
+  }
+
+  // check if the fragment is empty, if so, we can return early.
+  if (aFragment.IsEmpty()) {
+    return;
+  }
+
+  // check if there is a JS caller, if not, then we can can return early here
+  // because we only care about calls to the fragment parser (e.g. innerHTML)
+  // originating from JS code.
+  nsAutoString filename;
+  uint32_t lineNum = 0;
+  uint32_t columnNum = 0;
+  JSContext* cx = nsContentUtils::GetCurrentJSContext();
+  if (!nsJSUtils::GetCallingLocation(cx, filename, &lineNum, &columnNum)) {
+    return;
+  }
+
+  // check if we should skip assertion. Please only ever set this pref to
+  // true if really needed for testing purposes.
+  if (mozilla::StaticPrefs::dom_security_skip_html_fragment_assertion()) {
+    return;
+  }
+
+  /*
+   * WARNING: Do not add any new entries to the htmlFragmentAllowlist
+   * withiout proper review from a dom:security peer!
+   */
+  static nsLiteralCString htmlFragmentAllowlist[] = {
+      "chrome://global/content/elements/marquee.js"_ns,
+      nsLiteralCString(
+          "chrome://pocket/content/panels/js/vendor/jquery-2.1.1.min.js"),
+      "chrome://browser/content/aboutNetError.js"_ns,
+      nsLiteralCString("chrome://devtools/content/shared/sourceeditor/"
+                       "codemirror/codemirror.bundle.js"),
+      nsLiteralCString(
+          "chrome://devtools-startup/content/aboutdevtools/aboutdevtools.js"),
+      nsLiteralCString(
+          "resource://activity-stream/data/content/activity-stream.bundle.js"),
+      nsLiteralCString("resource://devtools/client/debugger/src/components/"
+                       "Editor/Breakpoint.js"),
+      nsLiteralCString("resource://devtools/client/debugger/src/components/"
+                       "Editor/ColumnBreakpoint.js"),
+      nsLiteralCString(
+          "resource://devtools/client/shared/vendor/fluent-react.js"),
+      "resource://devtools/client/shared/vendor/react-dom.js"_ns,
+      nsLiteralCString(
+          "resource://devtools/client/shared/vendor/react-dom-dev.js"),
+      nsLiteralCString(
+          "resource://devtools/client/shared/widgets/FilterWidget.js"),
+      nsLiteralCString("resource://devtools/client/shared/widgets/tooltip/"
+                       "inactive-css-tooltip-helper.js"),
+      "resource://devtools/client/shared/widgets/Spectrum.js"_ns,
+      "resource://gre/modules/narrate/VoiceSelect.jsm"_ns,
+      "resource://normandy-vendor/ReactDOM.js"_ns,
+      // ------------------------------------------------------------------
+      // test pages
+      // ------------------------------------------------------------------
+      "chrome://mochikit/content/harness.xhtml"_ns,
+      "chrome://mochikit/content/tests/"_ns,
+      "chrome://mochitests/content/"_ns,
+      "chrome://reftest/content/"_ns,
+  };
+
+  for (const nsLiteralCString& allowlistEntry : htmlFragmentAllowlist) {
+    if (StringBeginsWith(NS_ConvertUTF16toUTF8(filename), allowlistEntry)) {
+      return;
+    }
+  }
+
+  nsAutoCString uriSpec;
+  aPrincipal->GetAsciiSpec(uriSpec);
+
+  // Ideally we should not call the fragment parser (e.g. innerHTML()) in
+  // chrome: code or any of our about: pages. If you hit that assertion,
+  // please do *not* add your filename to the allowlist above, but rather
+  // refactor your code.
+  fprintf(stderr,
+          "Do not call the fragment parser (e.g innerHTML()) in chrome code "
+          "or in about: pages, (uri: %s), (caller: %s, line: %d, col: %d), "
+          "(fragment: %s)",
+          uriSpec.get(), NS_ConvertUTF16toUTF8(filename).get(), lineNum,
+          columnNum, NS_ConvertUTF16toUTF8(aFragment).get());
+  MOZ_ASSERT(false);
+}
+
+/* static */
+void DOMSecurityMonitor::AuditUseOfJavaScriptURI(nsIChannel* aChannel) {
+  nsCOMPtr<nsILoadInfo> loadInfo = aChannel->LoadInfo();
+  nsCOMPtr<nsIPrincipal> loadingPrincipal = loadInfo->GetLoadingPrincipal();
+
+  // We only ever have no loadingPrincipal in case of a new top-level load.
+  // The purpose of this assertion is to make sure we do not allow loading
+  // javascript: URIs in system privileged contexts. Hence there is nothing
+  // to do here in case there is no loadingPrincipal.
+  if (!loadingPrincipal) {
+    return;
+  }
+
+  // if the javascript: URI is not loaded by a system privileged context
+  // or an about: page, there there is nothing to do here.
+  if (!loadingPrincipal->IsSystemPrincipal() &&
+      !loadingPrincipal->SchemeIs("about")) {
+    return;
+  }
+
+  MOZ_ASSERT(false,
+             "Do not use javascript: URIs in chrome code or in about: pages");
+}