1 files changed, 399 insertions, 0 deletions
diff --git a/extensions/permissions/PermissionDelegateHandler.cpp b/extensions/permissions/PermissionDelegateHandler.cpp
new file mode 100644
index 0000000000..098d8386e8
--- /dev/null
+++ b/extensions/permissions/PermissionDelegateHandler.cpp
@@ -0,0 +1,399 @@
+/* -*- Mode: C++; tab-width: 2; 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 "mozilla/PermissionDelegateHandler.h"
+
+#include "nsGlobalWindowInner.h"
+#include "nsPIDOMWindow.h"
+#include "nsIPrincipal.h"
+#include "nsContentPermissionHelper.h"
+
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/StaticPrefs_permissions.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/FeaturePolicyUtils.h"
+#include "mozilla/dom/WindowContext.h"
+#include "mozilla/PermissionManager.h"
+
+using namespace mozilla::dom;
+
+namespace mozilla {
+
+typedef PermissionDelegateHandler::PermissionDelegatePolicy DelegatePolicy;
+typedef PermissionDelegateHandler::PermissionDelegateInfo DelegateInfo;
+
+// Particular type of permissions to care about. We decide cases by case and
+// give various types of controls over each of these.
+static const DelegateInfo sPermissionsMap[] = {
+    // Permissions API map
+    {"geo", u"geolocation", DelegatePolicy::eDelegateUseFeaturePolicy},
+    // The same with geo, but we support both to save some conversions between
+    // "geo" and "geolocation"
+    {"geolocation", u"geolocation", DelegatePolicy::eDelegateUseFeaturePolicy},
+    {"desktop-notification", nullptr,
+     DelegatePolicy::ePersistDeniedCrossOrigin},
+    {"persistent-storage", nullptr, DelegatePolicy::ePersistDeniedCrossOrigin},
+    {"vibration", nullptr, DelegatePolicy::ePersistDeniedCrossOrigin},
+    {"midi", nullptr, DelegatePolicy::eDelegateUseIframeOrigin},
+    {"storage-access", nullptr, DelegatePolicy::eDelegateUseIframeOrigin},
+    {"camera", u"camera", DelegatePolicy::eDelegateUseFeaturePolicy},
+    {"microphone", u"microphone", DelegatePolicy::eDelegateUseFeaturePolicy},
+    {"screen", u"display-capture", DelegatePolicy::eDelegateUseFeaturePolicy},
+    {"xr", u"xr-spatial-tracking", DelegatePolicy::eDelegateUseFeaturePolicy},
+};
+
+static_assert(PermissionDelegateHandler::DELEGATED_PERMISSION_COUNT ==
+                  (sizeof(sPermissionsMap) / sizeof(DelegateInfo)),
+              "The PermissionDelegateHandler::DELEGATED_PERMISSION_COUNT must "
+              "match to the "
+              "length of sPermissionsMap. Please update it.");
+
+NS_IMPL_CYCLE_COLLECTION(PermissionDelegateHandler)
+NS_IMPL_CYCLE_COLLECTING_ADDREF(PermissionDelegateHandler)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(PermissionDelegateHandler)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PermissionDelegateHandler)
+  NS_INTERFACE_MAP_ENTRY(nsIPermissionDelegateHandler)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+PermissionDelegateHandler::PermissionDelegateHandler(dom::Document* aDocument)
+    : mDocument(aDocument) {
+  MOZ_ASSERT(aDocument);
+}
+
+/* static */
+const DelegateInfo* PermissionDelegateHandler::GetPermissionDelegateInfo(
+    const nsAString& aPermissionName) {
+  nsAutoString lowerContent(aPermissionName);
+  ToLowerCase(lowerContent);
+
+  for (const auto& perm : sPermissionsMap) {
+    if (lowerContent.EqualsASCII(perm.mPermissionName)) {
+      return &perm;
+    }
+  }
+
+  return nullptr;
+}
+
+NS_IMETHODIMP
+PermissionDelegateHandler::MaybeUnsafePermissionDelegate(
+    const nsTArray<nsCString>& aTypes, bool* aMaybeUnsafe) {
+  *aMaybeUnsafe = false;
+  if (!StaticPrefs::permissions_delegation_enabled()) {
+    return NS_OK;
+  }
+
+  for (auto& type : aTypes) {
+    const DelegateInfo* info =
+        GetPermissionDelegateInfo(NS_ConvertUTF8toUTF16(type));
+    if (!info) {
+      continue;
+    }
+
+    nsAutoString featureName(info->mFeatureName);
+    if (FeaturePolicyUtils::IsFeatureUnsafeAllowedAll(mDocument, featureName)) {
+      *aMaybeUnsafe = true;
+      return NS_OK;
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+PermissionDelegateHandler::GetPermissionDelegateFPEnabled(bool* aEnabled) {
+  MOZ_ASSERT(NS_IsMainThread());
+  *aEnabled = StaticPrefs::permissions_delegation_enabled();
+  return NS_OK;
+}
+
+/* static */
+nsresult PermissionDelegateHandler::GetDelegatePrincipal(
+    const nsACString& aType, nsIContentPermissionRequest* aRequest,
+    nsIPrincipal** aResult) {
+  MOZ_ASSERT(aRequest);
+
+  if (!StaticPrefs::permissions_delegation_enabled()) {
+    return aRequest->GetPrincipal(aResult);
+  }
+
+  const DelegateInfo* info =
+      GetPermissionDelegateInfo(NS_ConvertUTF8toUTF16(aType));
+  if (!info) {
+    *aResult = nullptr;
+    return NS_OK;
+  }
+
+  if (info->mPolicy == DelegatePolicy::eDelegateUseTopOrigin ||
+      info->mPolicy == DelegatePolicy::eDelegateUseFeaturePolicy) {
+    return aRequest->GetTopLevelPrincipal(aResult);
+  }
+
+  return aRequest->GetPrincipal(aResult);
+}
+
+bool PermissionDelegateHandler::Initialize() {
+  MOZ_ASSERT(mDocument);
+
+  mPermissionManager = PermissionManager::GetInstance();
+  if (!mPermissionManager) {
+    return false;
+  }
+
+  mPrincipal = mDocument->NodePrincipal();
+  return true;
+}
+
+static bool IsCrossOriginContentToTop(Document* aDocument) {
+  MOZ_ASSERT(aDocument);
+
+  RefPtr<BrowsingContext> bc = aDocument->GetBrowsingContext();
+  if (!bc) {
+    return true;
+  }
+  RefPtr<BrowsingContext> topBC = bc->Top();
+
+  // In Fission, we can know if it is cross-origin by checking whether both
+  // contexts in the same process. So, If they are not in the same process, we
+  // can say that it's cross-origin.
+  if (!topBC->IsInProcess()) {
+    return true;
+  }
+
+  RefPtr<Document> topDoc = topBC->GetDocument();
+  if (!topDoc) {
+    return true;
+  }
+
+  nsCOMPtr<nsIPrincipal> topLevelPrincipal = topDoc->NodePrincipal();
+
+  return !aDocument->NodePrincipal()->Subsumes(topLevelPrincipal);
+}
+
+bool PermissionDelegateHandler::HasFeaturePolicyAllowed(
+    const DelegateInfo* info) const {
+  if (info->mPolicy != DelegatePolicy::eDelegateUseFeaturePolicy ||
+      !info->mFeatureName) {
+    return true;
+  }
+
+  nsAutoString featureName(info->mFeatureName);
+  return FeaturePolicyUtils::IsFeatureAllowed(mDocument, featureName);
+}
+
+bool PermissionDelegateHandler::HasPermissionDelegated(
+    const nsACString& aType) {
+  MOZ_ASSERT(mDocument);
+
+  // System principal should have right to make permission request
+  if (mPrincipal->IsSystemPrincipal()) {
+    return true;
+  }
+
+  const DelegateInfo* info =
+      GetPermissionDelegateInfo(NS_ConvertUTF8toUTF16(aType));
+  if (!info || !HasFeaturePolicyAllowed(info)) {
+    return false;
+  }
+
+  if (!StaticPrefs::permissions_delegation_enabled()) {
+    return true;
+  }
+
+  if (info->mPolicy == DelegatePolicy::ePersistDeniedCrossOrigin &&
+      !mDocument->IsTopLevelContentDocument() &&
+      IsCrossOriginContentToTop(mDocument)) {
+    return false;
+  }
+
+  return true;
+}
+
+nsresult PermissionDelegateHandler::GetPermission(const nsACString& aType,
+                                                  uint32_t* aPermission,
+                                                  bool aExactHostMatch) {
+  MOZ_ASSERT(mDocument);
+  MOZ_ASSERT(mPrincipal);
+
+  if (mPrincipal->IsSystemPrincipal()) {
+    *aPermission = nsIPermissionManager::ALLOW_ACTION;
+    return NS_OK;
+  }
+
+  const DelegateInfo* info =
+      GetPermissionDelegateInfo(NS_ConvertUTF8toUTF16(aType));
+  if (!info || !HasFeaturePolicyAllowed(info)) {
+    *aPermission = nsIPermissionManager::DENY_ACTION;
+    return NS_OK;
+  }
+
+  nsresult (NS_STDCALL nsIPermissionManager::*testPermission)(
+      nsIPrincipal*, const nsACString&, uint32_t*) =
+      aExactHostMatch ? &nsIPermissionManager::TestExactPermissionFromPrincipal
+                      : &nsIPermissionManager::TestPermissionFromPrincipal;
+
+  if (!StaticPrefs::permissions_delegation_enabled()) {
+    return (mPermissionManager->*testPermission)(mPrincipal, aType,
+                                                 aPermission);
+  }
+
+  if (info->mPolicy == DelegatePolicy::ePersistDeniedCrossOrigin &&
+      !mDocument->IsTopLevelContentDocument() &&
+      IsCrossOriginContentToTop(mDocument)) {
+    *aPermission = nsIPermissionManager::DENY_ACTION;
+    return NS_OK;
+  }
+
+  nsIPrincipal* principal = mPrincipal;
+  // If we cannot get the browsing context from the document, we fallback to use
+  // the prinicpal of the document to test the permission.
+  RefPtr<BrowsingContext> bc = mDocument->GetBrowsingContext();
+
+  if ((info->mPolicy == DelegatePolicy::eDelegateUseTopOrigin ||
+       info->mPolicy == DelegatePolicy::eDelegateUseFeaturePolicy) &&
+      bc) {
+    RefPtr<WindowContext> topWC = bc->GetTopWindowContext();
+
+    if (topWC && topWC->IsInProcess()) {
+      // If the top-level window context is in the same process, we directly get
+      // the node principal from the top-level document to test the permission.
+      // We cannot check the lists in the window context in this case since the
+      // 'perm-changed' could be notified in the iframe before the top-level in
+      // certain cases, for example, request permissions in first-party iframes.
+      // In this case, the list in window context hasn't gotten updated, so it
+      // would has an out-dated value until the top-level window get the
+      // observer. So, we have to test permission manager directly if we can.
+      RefPtr<Document> topDoc = topWC->GetBrowsingContext()->GetDocument();
+
+      if (topDoc) {
+        principal = topDoc->NodePrincipal();
+      }
+    } else if (topWC) {
+      // Get the delegated permissions from the top-level window context.
+      DelegatedPermissionList list =
+          aExactHostMatch ? topWC->GetDelegatedExactHostMatchPermissions()
+                          : topWC->GetDelegatedPermissions();
+      size_t idx = std::distance(sPermissionsMap, info);
+      *aPermission = list.mPermissions[idx];
+      return NS_OK;
+    }
+  }
+
+  return (mPermissionManager->*testPermission)(principal, aType, aPermission);
+}
+
+nsresult PermissionDelegateHandler::GetPermissionForPermissionsAPI(
+    const nsACString& aType, uint32_t* aPermission) {
+  return GetPermission(aType, aPermission, false);
+}
+
+void PermissionDelegateHandler::PopulateAllDelegatedPermissions() {
+  MOZ_ASSERT(mDocument);
+  MOZ_ASSERT(mPermissionManager);
+
+  // We only populate the delegated permissions for the top-level content.
+  if (!mDocument->IsTopLevelContentDocument()) {
+    return;
+  }
+
+  RefPtr<WindowContext> wc = mDocument->GetWindowContext();
+  NS_ENSURE_TRUE_VOID(wc && !wc->IsDiscarded());
+
+  DelegatedPermissionList list;
+  DelegatedPermissionList exactHostMatchList;
+
+  for (const auto& perm : sPermissionsMap) {
+    size_t idx = std::distance(sPermissionsMap, &perm);
+
+    nsDependentCString type(perm.mPermissionName);
+    // Populate the permission.
+    uint32_t permission = nsIPermissionManager::UNKNOWN_ACTION;
+    Unused << mPermissionManager->TestPermissionFromPrincipal(mPrincipal, type,
+                                                              &permission);
+    list.mPermissions[idx] = permission;
+
+    // Populate the exact-host-match permission.
+    permission = nsIPermissionManager::UNKNOWN_ACTION;
+    Unused << mPermissionManager->TestExactPermissionFromPrincipal(
+        mPrincipal, type, &permission);
+    exactHostMatchList.mPermissions[idx] = permission;
+  }
+
+  WindowContext::Transaction txn;
+  txn.SetDelegatedPermissions(list);
+  txn.SetDelegatedExactHostMatchPermissions(exactHostMatchList);
+  MOZ_ALWAYS_SUCCEEDS(txn.Commit(wc));
+}
+
+void PermissionDelegateHandler::UpdateDelegatedPermission(
+    const nsACString& aType) {
+  MOZ_ASSERT(mDocument);
+  MOZ_ASSERT(mPermissionManager);
+
+  // We only update the delegated permission for the top-level content.
+  if (!mDocument->IsTopLevelContentDocument()) {
+    return;
+  }
+
+  RefPtr<WindowContext> wc = mDocument->GetWindowContext();
+  NS_ENSURE_TRUE_VOID(wc);
+
+  const DelegateInfo* info =
+      GetPermissionDelegateInfo(NS_ConvertUTF8toUTF16(aType));
+  NS_ENSURE_TRUE_VOID(info);
+  size_t idx = std::distance(sPermissionsMap, info);
+
+  WindowContext::Transaction txn;
+  bool changed = false;
+  DelegatedPermissionList list = wc->GetDelegatedPermissions();
+
+  if (UpdateDelegatePermissionInternal(
+          list, aType, idx,
+          &nsIPermissionManager::TestPermissionFromPrincipal)) {
+    txn.SetDelegatedPermissions(list);
+    changed = true;
+  }
+
+  DelegatedPermissionList exactHostMatchList =
+      wc->GetDelegatedExactHostMatchPermissions();
+
+  if (UpdateDelegatePermissionInternal(
+          exactHostMatchList, aType, idx,
+          &nsIPermissionManager::TestExactPermissionFromPrincipal)) {
+    txn.SetDelegatedExactHostMatchPermissions(exactHostMatchList);
+    changed = true;
+  }
+
+  // We only commit if there is any change of permissions.
+  if (changed) {
+    MOZ_ALWAYS_SUCCEEDS(txn.Commit(wc));
+  }
+}
+
+bool PermissionDelegateHandler::UpdateDelegatePermissionInternal(
+    PermissionDelegateHandler::DelegatedPermissionList& aList,
+    const nsACString& aType, size_t aIdx,
+    nsresult (NS_STDCALL nsIPermissionManager::*aTestFunc)(nsIPrincipal*,
+                                                           const nsACString&,
+                                                           uint32_t*)) {
+  MOZ_ASSERT(aTestFunc);
+  MOZ_ASSERT(mPermissionManager);
+  MOZ_ASSERT(mPrincipal);
+
+  uint32_t permission = nsIPermissionManager::UNKNOWN_ACTION;
+  Unused << (mPermissionManager->*aTestFunc)(mPrincipal, aType, &permission);
+
+  if (aList.mPermissions[aIdx] != permission) {
+    aList.mPermissions[aIdx] = permission;
+    return true;
+  }
+
+  return false;
+}
+
+}  // namespace mozilla