1 files changed, 94 insertions, 0 deletions
diff --git a/security/sandbox/common/SandboxSettings.cpp b/security/sandbox/common/SandboxSettings.cpp
new file mode 100644
index 0000000000..c3f716e484
--- /dev/null
+++ b/security/sandbox/common/SandboxSettings.cpp
@@ -0,0 +1,94 @@
+/* -*- 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 "mozISandboxSettings.h"
+
+#include "mozilla/Components.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/StaticPrefs_media.h"
+#include "mozilla/StaticPrefs_security.h"
+
+#include "prenv.h"
+
+using namespace mozilla;
+
+namespace mozilla {
+
+int GetEffectiveContentSandboxLevel() {
+  if (PR_GetEnv("MOZ_DISABLE_CONTENT_SANDBOX")) {
+    return 0;
+  }
+  int level = StaticPrefs::security_sandbox_content_level_DoNotUseDirectly();
+// On Windows and macOS, enforce a minimum content sandbox level of 1 (except on
+// Nightly, where it can be set to 0).
+#if !defined(NIGHTLY_BUILD) && (defined(XP_WIN) || defined(XP_MACOSX))
+  if (level < 1) {
+    level = 1;
+  }
+#endif
+#ifdef XP_LINUX
+  // Level 4 and up will break direct access to audio.
+  if (level > 3 && !StaticPrefs::media_cubeb_sandbox()) {
+    level = 3;
+  }
+#endif
+
+  return level;
+}
+
+bool IsContentSandboxEnabled() { return GetEffectiveContentSandboxLevel() > 0; }
+
+int GetEffectiveSocketProcessSandboxLevel() {
+  if (PR_GetEnv("MOZ_DISABLE_SOCKET_PROCESS_SANDBOX")) {
+    return 0;
+  }
+
+  int level =
+      StaticPrefs::security_sandbox_socket_process_level_DoNotUseDirectly();
+
+  return level;
+}
+
+#if defined(XP_MACOSX)
+int ClampFlashSandboxLevel(const int aLevel) {
+  const int minLevel = 0;
+  const int maxLevel = 3;
+
+  if (aLevel < minLevel) {
+    return minLevel;
+  }
+
+  if (aLevel > maxLevel) {
+    return maxLevel;
+  }
+  return aLevel;
+}
+#endif
+
+class SandboxSettings final : public mozISandboxSettings {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_MOZISANDBOXSETTINGS
+
+  SandboxSettings() = default;
+
+ private:
+  ~SandboxSettings() = default;
+};
+
+NS_IMPL_ISUPPORTS(SandboxSettings, mozISandboxSettings)
+
+NS_IMETHODIMP SandboxSettings::GetEffectiveContentSandboxLevel(
+    int32_t* aRetVal) {
+  *aRetVal = mozilla::GetEffectiveContentSandboxLevel();
+  return NS_OK;
+}
+
+}  // namespace mozilla
+
+NS_IMPL_COMPONENT_FACTORY(mozISandboxSettings) {
+  return MakeAndAddRef<SandboxSettings>().downcast<nsISupports>();
+}