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-rw-r--r--extensions/permissions/PermissionDelegateHandler.cpp380
1 files changed, 380 insertions, 0 deletions
diff --git a/extensions/permissions/PermissionDelegateHandler.cpp b/extensions/permissions/PermissionDelegateHandler.cpp
new file mode 100644
index 0000000000..c25afb560e
--- /dev/null
+++ b/extensions/permissions/PermissionDelegateHandler.cpp
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+/* -*- 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 "nsPIDOMWindow.h"
+#include "nsIPrincipal.h"
+#include "nsContentPermissionHelper.h"
+
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/StaticPrefs_permissions.h"
+#include "mozilla/dom/BrowsingContext.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. All permission names have to be in lowercase.
+ {"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},
+ // Like "midi" but with sysex support.
+ {"midi-sysex", 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},
+ {"screen-wake-lock", u"screen-wake-lock",
+ 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;
+ 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;
+}
+
+/* static */
+nsresult PermissionDelegateHandler::GetDelegatePrincipal(
+ const nsACString& aType, nsIContentPermissionRequest* aRequest,
+ nsIPrincipal** aResult) {
+ MOZ_ASSERT(aRequest);
+
+ 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) const {
+ 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 (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 (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));
+ if (!info) {
+ return;
+ }
+ 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