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-rw-r--r--netwerk/protocol/res/ExtensionProtocolHandler.cpp1041
1 files changed, 1041 insertions, 0 deletions
diff --git a/netwerk/protocol/res/ExtensionProtocolHandler.cpp b/netwerk/protocol/res/ExtensionProtocolHandler.cpp
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+++ b/netwerk/protocol/res/ExtensionProtocolHandler.cpp
@@ -0,0 +1,1041 @@
+/* -*- 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 "ExtensionProtocolHandler.h"
+
+#include "mozilla/BinarySearch.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/Promise-inl.h"
+#include "mozilla/ExtensionPolicyService.h"
+#include "mozilla/FileUtils.h"
+#include "mozilla/ipc/FileDescriptor.h"
+#include "mozilla/ipc/IPCStreamUtils.h"
+#include "mozilla/ipc/URIUtils.h"
+#include "mozilla/net/NeckoChild.h"
+#include "mozilla/Omnijar.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/ResultExtensions.h"
+
+#include "FileDescriptorFile.h"
+#include "LoadInfo.h"
+#include "nsContentUtils.h"
+#include "nsServiceManagerUtils.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsICancelable.h"
+#include "nsIFile.h"
+#include "nsIFileChannel.h"
+#include "nsIFileStreams.h"
+#include "nsIFileURL.h"
+#include "nsIJARChannel.h"
+#include "nsIMIMEService.h"
+#include "nsIURL.h"
+#include "nsIChannel.h"
+#include "nsIInputStreamPump.h"
+#include "nsIJARURI.h"
+#include "nsIStreamListener.h"
+#include "nsIInputStream.h"
+#include "nsIStreamConverterService.h"
+#include "nsNetUtil.h"
+#include "nsReadableUtils.h"
+#include "nsURLHelper.h"
+#include "prio.h"
+#include "SimpleChannel.h"
+
+#if defined(XP_WIN)
+# include "nsILocalFileWin.h"
+# include "WinUtils.h"
+#endif
+
+#if defined(XP_MACOSX)
+# include "nsMacUtilsImpl.h"
+#endif
+
+#define EXTENSION_SCHEME "moz-extension"
+using mozilla::dom::Promise;
+using mozilla::ipc::FileDescriptor;
+
+// A list of file extensions containing purely static data, which can be loaded
+// from an extension before the extension is fully ready. The main purpose of
+// this is to allow image resources from theme XPIs to load quickly during
+// browser startup.
+//
+// The layout of this array is chosen in order to prevent the need for runtime
+// relocation, which an array of char* pointers would require. It also has the
+// benefit of being more compact when the difference in length between the
+// longest and average string is less than 8 bytes. The length of the
+// char[] array must match the size of the longest entry in the list.
+//
+// This list must be kept sorted.
+static const char sStaticFileExtensions[][5] = {
+ // clang-format off
+ "bmp",
+ "gif",
+ "ico",
+ "jpeg",
+ "jpg",
+ "png",
+ "svg",
+ // clang-format on
+};
+
+namespace mozilla {
+
+namespace net {
+
+using extensions::URLInfo;
+
+LazyLogModule gExtProtocolLog("ExtProtocol");
+#undef LOG
+#define LOG(...) MOZ_LOG(gExtProtocolLog, LogLevel::Debug, (__VA_ARGS__))
+
+StaticRefPtr<ExtensionProtocolHandler> ExtensionProtocolHandler::sSingleton;
+
+/**
+ * Helper class used with SimpleChannel to asynchronously obtain an input
+ * stream or file descriptor from the parent for a remote moz-extension load
+ * from the child.
+ */
+class ExtensionStreamGetter final : public nsICancelable {
+ NS_DECL_ISUPPORTS
+ NS_DECL_NSICANCELABLE
+
+ public:
+ // To use when getting a remote input stream for a resource
+ // in an unpacked extension.
+ ExtensionStreamGetter(nsIURI* aURI, nsILoadInfo* aLoadInfo)
+ : mURI(aURI), mLoadInfo(aLoadInfo), mIsJarChannel(false) {
+ MOZ_ASSERT(aURI);
+ MOZ_ASSERT(aLoadInfo);
+
+ SetupEventTarget();
+ }
+
+ // To use when getting an FD for a packed extension JAR file
+ // in order to load a resource.
+ ExtensionStreamGetter(nsIURI* aURI, nsILoadInfo* aLoadInfo,
+ already_AddRefed<nsIJARChannel>&& aJarChannel,
+ nsIFile* aJarFile)
+ : mURI(aURI),
+ mLoadInfo(aLoadInfo),
+ mJarChannel(std::move(aJarChannel)),
+ mJarFile(aJarFile),
+ mIsJarChannel(true) {
+ MOZ_ASSERT(aURI);
+ MOZ_ASSERT(aLoadInfo);
+ MOZ_ASSERT(mJarChannel);
+ MOZ_ASSERT(aJarFile);
+
+ SetupEventTarget();
+ }
+
+ void SetupEventTarget() {
+ mMainThreadEventTarget = nsContentUtils::GetEventTargetByLoadInfo(
+ mLoadInfo, TaskCategory::Other);
+ if (!mMainThreadEventTarget) {
+ mMainThreadEventTarget = GetMainThreadSerialEventTarget();
+ }
+ }
+
+ // Get an input stream or file descriptor from the parent asynchronously.
+ RequestOrReason GetAsync(nsIStreamListener* aListener, nsIChannel* aChannel);
+
+ // Handle an input stream being returned from the parent
+ void OnStream(already_AddRefed<nsIInputStream> aStream);
+
+ // Handle file descriptor being returned from the parent
+ void OnFD(const FileDescriptor& aFD);
+
+ static void CancelRequest(nsIStreamListener* aListener, nsIChannel* aChannel,
+ nsresult aResult);
+
+ private:
+ ~ExtensionStreamGetter() = default;
+
+ nsCOMPtr<nsIURI> mURI;
+ nsCOMPtr<nsILoadInfo> mLoadInfo;
+ nsCOMPtr<nsIJARChannel> mJarChannel;
+ nsCOMPtr<nsIInputStreamPump> mPump;
+ nsCOMPtr<nsIFile> mJarFile;
+ nsCOMPtr<nsIStreamListener> mListener;
+ nsCOMPtr<nsIChannel> mChannel;
+ nsCOMPtr<nsISerialEventTarget> mMainThreadEventTarget;
+ bool mIsJarChannel;
+ bool mCanceled{false};
+ nsresult mStatus{NS_OK};
+};
+
+NS_IMPL_ISUPPORTS(ExtensionStreamGetter, nsICancelable)
+
+class ExtensionJARFileOpener final : public nsISupports {
+ public:
+ ExtensionJARFileOpener(nsIFile* aFile,
+ NeckoParent::GetExtensionFDResolver& aResolve)
+ : mFile(aFile), mResolve(aResolve) {
+ MOZ_ASSERT(aFile);
+ MOZ_ASSERT(aResolve);
+ }
+
+ NS_IMETHOD OpenFile() {
+ MOZ_ASSERT(!NS_IsMainThread());
+ AutoFDClose prFileDesc;
+
+#if defined(XP_WIN)
+ nsresult rv;
+ nsCOMPtr<nsILocalFileWin> winFile = do_QueryInterface(mFile, &rv);
+ MOZ_ASSERT(winFile);
+ if (NS_SUCCEEDED(rv)) {
+ rv = winFile->OpenNSPRFileDescShareDelete(PR_RDONLY, 0,
+ &prFileDesc.rwget());
+ }
+#else
+ nsresult rv = mFile->OpenNSPRFileDesc(PR_RDONLY, 0, &prFileDesc.rwget());
+#endif /* XP_WIN */
+
+ if (NS_SUCCEEDED(rv)) {
+ mFD = FileDescriptor(FileDescriptor::PlatformHandleType(
+ PR_FileDesc2NativeHandle(prFileDesc)));
+ }
+
+ nsCOMPtr<nsIRunnable> event =
+ mozilla::NewRunnableMethod("ExtensionJarFileFDResolver", this,
+ &ExtensionJARFileOpener::SendBackFD);
+
+ rv = NS_DispatchToMainThread(event, nsIEventTarget::DISPATCH_NORMAL);
+ NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "NS_DispatchToMainThread");
+ return NS_OK;
+ }
+
+ NS_IMETHOD SendBackFD() {
+ MOZ_ASSERT(NS_IsMainThread());
+ mResolve(mFD);
+ mResolve = nullptr;
+ return NS_OK;
+ }
+
+ NS_DECL_THREADSAFE_ISUPPORTS
+
+ private:
+ virtual ~ExtensionJARFileOpener() = default;
+
+ nsCOMPtr<nsIFile> mFile;
+ NeckoParent::GetExtensionFDResolver mResolve;
+ FileDescriptor mFD;
+};
+
+NS_IMPL_ISUPPORTS(ExtensionJARFileOpener, nsISupports)
+
+// The amount of time, in milliseconds, that the file opener thread will remain
+// allocated after it is used. This value chosen because to match other uses
+// of LazyIdleThread.
+#define DEFAULT_THREAD_TIMEOUT_MS 30000
+
+// Request an FD or input stream from the parent.
+RequestOrReason ExtensionStreamGetter::GetAsync(nsIStreamListener* aListener,
+ nsIChannel* aChannel) {
+ MOZ_ASSERT(IsNeckoChild());
+ MOZ_ASSERT(mMainThreadEventTarget);
+
+ mListener = aListener;
+ mChannel = aChannel;
+
+ nsCOMPtr<nsICancelable> cancelableRequest(this);
+
+ RefPtr<ExtensionStreamGetter> self = this;
+ if (mIsJarChannel) {
+ // Request an FD for this moz-extension URI
+ gNeckoChild->SendGetExtensionFD(mURI)->Then(
+ mMainThreadEventTarget, __func__,
+ [self](const FileDescriptor& fd) { self->OnFD(fd); },
+ [self](const mozilla::ipc::ResponseRejectReason) {
+ self->OnFD(FileDescriptor());
+ });
+ return RequestOrCancelable(WrapNotNull(cancelableRequest));
+ }
+
+ // Request an input stream for this moz-extension URI
+ gNeckoChild->SendGetExtensionStream(mURI)->Then(
+ mMainThreadEventTarget, __func__,
+ [self](const RefPtr<nsIInputStream>& stream) {
+ self->OnStream(do_AddRef(stream));
+ },
+ [self](const mozilla::ipc::ResponseRejectReason) {
+ self->OnStream(nullptr);
+ });
+ return RequestOrCancelable(WrapNotNull(cancelableRequest));
+}
+
+// Called to cancel the ongoing async request.
+NS_IMETHODIMP
+ExtensionStreamGetter::Cancel(nsresult aStatus) {
+ if (mCanceled) {
+ return NS_OK;
+ }
+
+ mCanceled = true;
+ mStatus = aStatus;
+
+ if (mPump) {
+ mPump->CancelWithReason(aStatus, "ExtensionStreamGetter::Cancel"_ns);
+ mPump = nullptr;
+ }
+
+ if (mIsJarChannel && mJarChannel) {
+ mJarChannel->CancelWithReason(aStatus, "ExtensionStreamGetter::Cancel"_ns);
+ }
+
+ return NS_OK;
+}
+
+// static
+void ExtensionStreamGetter::CancelRequest(nsIStreamListener* aListener,
+ nsIChannel* aChannel,
+ nsresult aResult) {
+ MOZ_ASSERT(aListener);
+ MOZ_ASSERT(aChannel);
+
+ aListener->OnStartRequest(aChannel);
+ aListener->OnStopRequest(aChannel, aResult);
+ aChannel->CancelWithReason(NS_BINDING_ABORTED,
+ "ExtensionStreamGetter::CancelRequest"_ns);
+}
+
+// Handle an input stream sent from the parent.
+void ExtensionStreamGetter::OnStream(already_AddRefed<nsIInputStream> aStream) {
+ MOZ_ASSERT(IsNeckoChild());
+ MOZ_ASSERT(mChannel);
+ MOZ_ASSERT(mListener);
+ MOZ_ASSERT(mMainThreadEventTarget);
+
+ nsCOMPtr<nsIInputStream> stream = std::move(aStream);
+ nsCOMPtr<nsIChannel> channel = std::move(mChannel);
+
+ // We must keep an owning reference to the listener
+ // until we pass it on to AsyncRead.
+ nsCOMPtr<nsIStreamListener> listener = std::move(mListener);
+
+ if (mCanceled) {
+ // The channel that has created this stream getter has been canceled.
+ CancelRequest(listener, channel, mStatus);
+ return;
+ }
+
+ if (!stream) {
+ // The parent didn't send us back a stream.
+ CancelRequest(listener, channel, NS_ERROR_FILE_ACCESS_DENIED);
+ return;
+ }
+
+ nsCOMPtr<nsIInputStreamPump> pump;
+ nsresult rv = NS_NewInputStreamPump(getter_AddRefs(pump), stream.forget(), 0,
+ 0, false, mMainThreadEventTarget);
+ if (NS_FAILED(rv)) {
+ CancelRequest(listener, channel, rv);
+ return;
+ }
+
+ rv = pump->AsyncRead(listener);
+ if (NS_FAILED(rv)) {
+ CancelRequest(listener, channel, rv);
+ return;
+ }
+
+ mPump = pump;
+}
+
+// Handle an FD sent from the parent.
+void ExtensionStreamGetter::OnFD(const FileDescriptor& aFD) {
+ MOZ_ASSERT(IsNeckoChild());
+ MOZ_ASSERT(mChannel);
+ MOZ_ASSERT(mListener);
+
+ nsCOMPtr<nsIChannel> channel = std::move(mChannel);
+
+ // We must keep an owning reference to the listener
+ // until we pass it on to AsyncOpen.
+ nsCOMPtr<nsIStreamListener> listener = std::move(mListener);
+
+ if (mCanceled) {
+ // The channel that has created this stream getter has been canceled.
+ CancelRequest(listener, channel, mStatus);
+ return;
+ }
+
+ if (!aFD.IsValid()) {
+ // The parent didn't send us back a valid file descriptor.
+ CancelRequest(listener, channel, NS_ERROR_FILE_ACCESS_DENIED);
+ return;
+ }
+
+ RefPtr<FileDescriptorFile> fdFile = new FileDescriptorFile(aFD, mJarFile);
+ mJarChannel->SetJarFile(fdFile);
+ nsresult rv = mJarChannel->AsyncOpen(listener);
+ if (NS_FAILED(rv)) {
+ CancelRequest(listener, channel, rv);
+ }
+}
+
+NS_IMPL_QUERY_INTERFACE(ExtensionProtocolHandler,
+ nsISubstitutingProtocolHandler, nsIProtocolHandler,
+ nsIProtocolHandlerWithDynamicFlags,
+ nsISupportsWeakReference)
+NS_IMPL_ADDREF_INHERITED(ExtensionProtocolHandler, SubstitutingProtocolHandler)
+NS_IMPL_RELEASE_INHERITED(ExtensionProtocolHandler, SubstitutingProtocolHandler)
+
+already_AddRefed<ExtensionProtocolHandler>
+ExtensionProtocolHandler::GetSingleton() {
+ if (!sSingleton) {
+ sSingleton = new ExtensionProtocolHandler();
+ ClearOnShutdown(&sSingleton);
+ }
+ return do_AddRef(sSingleton);
+}
+
+ExtensionProtocolHandler::ExtensionProtocolHandler()
+ : SubstitutingProtocolHandler(EXTENSION_SCHEME) {
+ // Note, extensions.webextensions.protocol.remote=false is for
+ // debugging purposes only. With process-level sandboxing, child
+ // processes (specifically content and extension processes), will
+ // not be able to load most moz-extension URI's when the pref is
+ // set to false.
+ mUseRemoteFileChannels =
+ IsNeckoChild() &&
+ Preferences::GetBool("extensions.webextensions.protocol.remote");
+}
+
+static inline ExtensionPolicyService& EPS() {
+ return ExtensionPolicyService::GetSingleton();
+}
+
+nsresult ExtensionProtocolHandler::GetFlagsForURI(nsIURI* aURI,
+ uint32_t* aFlags) {
+ uint32_t flags =
+ URI_STD | URI_IS_LOCAL_RESOURCE | URI_IS_POTENTIALLY_TRUSTWORTHY;
+
+ URLInfo url(aURI);
+ if (auto* policy = EPS().GetByURL(url)) {
+ // In general a moz-extension URI is only loadable by chrome, but an
+ // allowlist subset are web-accessible (and cross-origin fetchable).
+ // The allowlist is checked using EPS.SourceMayLoadExtensionURI in
+ // BasePrincipal and nsScriptSecurityManager.
+ if (policy->IsWebAccessiblePath(url.FilePath())) {
+ if (policy->ManifestVersion() < 3) {
+ flags |= URI_LOADABLE_BY_ANYONE | URI_FETCHABLE_BY_ANYONE;
+ } else {
+ flags |= WEBEXT_URI_WEB_ACCESSIBLE;
+ }
+ } else if (policy->Type() == nsGkAtoms::theme) {
+ // Static themes cannot set web accessible resources, however using this
+ // flag here triggers SourceMayAccessPath calls necessary to allow another
+ // extension to access static theme resources in this extension.
+ flags |= WEBEXT_URI_WEB_ACCESSIBLE;
+ } else {
+ flags |= URI_DANGEROUS_TO_LOAD;
+ }
+
+ // Disallow in private windows if the extension does not have permission.
+ if (!policy->PrivateBrowsingAllowed()) {
+ flags |= URI_DISALLOW_IN_PRIVATE_CONTEXT;
+ }
+ } else {
+ // In case there is no policy, then default to treating moz-extension URIs
+ // as unsafe and generally only allow chrome: to load such.
+ flags |= URI_DANGEROUS_TO_LOAD;
+ }
+
+ *aFlags = flags;
+ return NS_OK;
+}
+
+bool ExtensionProtocolHandler::ResolveSpecialCases(const nsACString& aHost,
+ const nsACString& aPath,
+ const nsACString& aPathname,
+ nsACString& aResult) {
+ MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread(),
+ "The ExtensionPolicyService is not thread safe");
+ // Create special moz-extension://foo/_generated_background_page.html page
+ // for all registered extensions. We can't just do this as a substitution
+ // because substitutions can only match on host.
+ if (!SubstitutingProtocolHandler::HasSubstitution(aHost)) {
+ return false;
+ }
+
+ if (aPathname.EqualsLiteral("/_generated_background_page.html")) {
+ Unused << EPS().GetGeneratedBackgroundPageUrl(aHost, aResult);
+ return !aResult.IsEmpty();
+ }
+
+ return false;
+}
+
+// For file or JAR URI's, substitute in a remote channel.
+Result<Ok, nsresult> ExtensionProtocolHandler::SubstituteRemoteChannel(
+ nsIURI* aURI, nsILoadInfo* aLoadInfo, nsIChannel** aRetVal) {
+ MOZ_ASSERT(IsNeckoChild());
+ MOZ_TRY(aURI ? NS_OK : NS_ERROR_INVALID_ARG);
+ MOZ_TRY(aLoadInfo ? NS_OK : NS_ERROR_INVALID_ARG);
+
+ nsAutoCString unResolvedSpec;
+ MOZ_TRY(aURI->GetSpec(unResolvedSpec));
+
+ nsAutoCString resolvedSpec;
+ MOZ_TRY(ResolveURI(aURI, resolvedSpec));
+
+ // Use the target URI scheme to determine if this is a packed or unpacked
+ // extension URI. For unpacked extensions, we'll request an input stream
+ // from the parent. For a packed extension, we'll request a file descriptor
+ // for the JAR file.
+ nsAutoCString scheme;
+ MOZ_TRY(net_ExtractURLScheme(resolvedSpec, scheme));
+
+ if (scheme.EqualsLiteral("file")) {
+ // Unpacked extension
+ SubstituteRemoteFileChannel(aURI, aLoadInfo, resolvedSpec, aRetVal);
+ return Ok();
+ }
+
+ if (scheme.EqualsLiteral("jar")) {
+ // Packed extension
+ return SubstituteRemoteJarChannel(aURI, aLoadInfo, resolvedSpec, aRetVal);
+ }
+
+ // Only unpacked resource files and JAR files are remoted.
+ // No other moz-extension loads should be reading from the filesystem.
+ return Ok();
+}
+
+void OpenWhenReady(
+ Promise* aPromise, nsIStreamListener* aListener, nsIChannel* aChannel,
+ const std::function<nsresult(nsIStreamListener*, nsIChannel*)>& aCallback) {
+ nsCOMPtr<nsIStreamListener> listener(aListener);
+ nsCOMPtr<nsIChannel> channel(aChannel);
+
+ Unused << aPromise->ThenWithCycleCollectedArgs(
+ [channel, aCallback](
+ JSContext* aCx, JS::Handle<JS::Value> aValue, ErrorResult& aRv,
+ nsIStreamListener* aListener) -> already_AddRefed<Promise> {
+ nsresult rv = aCallback(aListener, channel);
+ if (NS_FAILED(rv)) {
+ ExtensionStreamGetter::CancelRequest(aListener, channel, rv);
+ }
+ return nullptr;
+ },
+ listener);
+}
+
+nsresult ExtensionProtocolHandler::SubstituteChannel(nsIURI* aURI,
+ nsILoadInfo* aLoadInfo,
+ nsIChannel** result) {
+ if (mUseRemoteFileChannels) {
+ MOZ_TRY(SubstituteRemoteChannel(aURI, aLoadInfo, result));
+ }
+
+ auto* policy = EPS().GetByURL(aURI);
+ NS_ENSURE_TRUE(policy, NS_ERROR_UNEXPECTED);
+
+ RefPtr<dom::Promise> readyPromise(policy->ReadyPromise());
+
+ nsresult rv;
+ nsCOMPtr<nsIURL> url = do_QueryInterface(aURI, &rv);
+ MOZ_TRY(rv);
+
+ nsAutoCString ext;
+ MOZ_TRY(url->GetFileExtension(ext));
+ ToLowerCase(ext);
+
+ nsCOMPtr<nsIChannel> channel;
+ if (ext.EqualsLiteral("css")) {
+ // Filter CSS files to replace locale message tokens with localized strings.
+ static const auto convert = [](nsIStreamListener* listener,
+ nsIChannel* channel,
+ nsIChannel* origChannel) -> nsresult {
+ nsresult rv;
+ nsCOMPtr<nsIStreamConverterService> convService =
+ do_GetService(NS_STREAMCONVERTERSERVICE_CONTRACTID, &rv);
+ MOZ_TRY(rv);
+
+ nsCOMPtr<nsIURI> uri;
+ MOZ_TRY(channel->GetURI(getter_AddRefs(uri)));
+
+ const char* kFromType = "application/vnd.mozilla.webext.unlocalized";
+ const char* kToType = "text/css";
+
+ nsCOMPtr<nsIStreamListener> converter;
+ MOZ_TRY(convService->AsyncConvertData(kFromType, kToType, listener, uri,
+ getter_AddRefs(converter)));
+
+ return origChannel->AsyncOpen(converter);
+ };
+
+ channel = NS_NewSimpleChannel(
+ aURI, aLoadInfo, *result,
+ [readyPromise](nsIStreamListener* listener, nsIChannel* channel,
+ nsIChannel* origChannel) -> RequestOrReason {
+ if (readyPromise) {
+ nsCOMPtr<nsIChannel> chan(channel);
+ OpenWhenReady(
+ readyPromise, listener, origChannel,
+ [chan](nsIStreamListener* aListener, nsIChannel* aChannel) {
+ return convert(aListener, chan, aChannel);
+ });
+ } else {
+ MOZ_TRY(convert(listener, channel, origChannel));
+ }
+ nsCOMPtr<nsIRequest> request(origChannel);
+ return RequestOrCancelable(WrapNotNull(request));
+ });
+ } else if (readyPromise) {
+ size_t matchIdx;
+ if (BinarySearchIf(
+ sStaticFileExtensions, 0, ArrayLength(sStaticFileExtensions),
+ [&ext](const char* aOther) {
+ return Compare(ext, nsDependentCString(aOther));
+ },
+ &matchIdx)) {
+ // This is a static resource that shouldn't depend on the extension being
+ // ready. Don't bother waiting for it.
+ return NS_OK;
+ }
+
+ channel = NS_NewSimpleChannel(
+ aURI, aLoadInfo, *result,
+ [readyPromise](nsIStreamListener* listener, nsIChannel* channel,
+ nsIChannel* origChannel) -> RequestOrReason {
+ OpenWhenReady(readyPromise, listener, origChannel,
+ [](nsIStreamListener* aListener, nsIChannel* aChannel) {
+ return aChannel->AsyncOpen(aListener);
+ });
+
+ nsCOMPtr<nsIRequest> request(origChannel);
+ return RequestOrCancelable(WrapNotNull(request));
+ });
+ } else {
+ return NS_OK;
+ }
+
+ NS_ENSURE_TRUE(channel, NS_ERROR_OUT_OF_MEMORY);
+ if (aLoadInfo) {
+ nsCOMPtr<nsILoadInfo> loadInfo =
+ static_cast<LoadInfo*>(aLoadInfo)->CloneForNewRequest();
+ (*result)->SetLoadInfo(loadInfo);
+ }
+
+ channel.swap(*result);
+ return NS_OK;
+}
+
+Result<bool, nsresult> ExtensionProtocolHandler::AllowExternalResource(
+ nsIFile* aExtensionDir, nsIFile* aRequestedFile) {
+ MOZ_ASSERT(!IsNeckoChild());
+
+#if defined(XP_WIN)
+ // On Windows, non-package builds don't use symlinks so we never need to
+ // allow a resource from outside of the extension dir.
+ return false;
+#else
+ if (mozilla::IsPackagedBuild()) {
+ return false;
+ }
+
+ // On Mac and Linux unpackaged dev builds, system extensions use
+ // symlinks to point to resources in the repo dir which we have to
+ // allow loading. Before we allow an unpacked extension to load a
+ // resource outside of the extension dir, we make sure the extension
+ // dir is within the app directory.
+ bool result;
+ MOZ_TRY_VAR(result, AppDirContains(aExtensionDir));
+ if (!result) {
+ return false;
+ }
+
+# if defined(XP_MACOSX)
+ // Additionally, on Mac dev builds, we make sure that the requested
+ // resource is within the repo dir. We don't perform this check on Linux
+ // because we don't have a reliable path to the repo dir on Linux.
+ return DevRepoContains(aRequestedFile);
+# else /* XP_MACOSX */
+ return true;
+# endif
+#endif /* defined(XP_WIN) */
+}
+
+#if defined(XP_MACOSX)
+// The |aRequestedFile| argument must already be Normalize()'d
+Result<bool, nsresult> ExtensionProtocolHandler::DevRepoContains(
+ nsIFile* aRequestedFile) {
+ MOZ_ASSERT(!mozilla::IsPackagedBuild());
+ MOZ_ASSERT(!IsNeckoChild());
+
+ // On the first invocation, set mDevRepo
+ if (!mAlreadyCheckedDevRepo) {
+ mAlreadyCheckedDevRepo = true;
+ MOZ_TRY(nsMacUtilsImpl::GetRepoDir(getter_AddRefs(mDevRepo)));
+ if (MOZ_LOG_TEST(gExtProtocolLog, LogLevel::Debug)) {
+ nsAutoCString repoPath;
+ Unused << mDevRepo->GetNativePath(repoPath);
+ LOG("Repo path: %s", repoPath.get());
+ }
+ }
+
+ bool result = false;
+ if (mDevRepo) {
+ MOZ_TRY(mDevRepo->Contains(aRequestedFile, &result));
+ }
+ return result;
+}
+#endif /* XP_MACOSX */
+
+#if !defined(XP_WIN)
+Result<bool, nsresult> ExtensionProtocolHandler::AppDirContains(
+ nsIFile* aExtensionDir) {
+ MOZ_ASSERT(!mozilla::IsPackagedBuild());
+ MOZ_ASSERT(!IsNeckoChild());
+
+ // On the first invocation, set mAppDir
+ if (!mAlreadyCheckedAppDir) {
+ mAlreadyCheckedAppDir = true;
+ MOZ_TRY(NS_GetSpecialDirectory(NS_GRE_DIR, getter_AddRefs(mAppDir)));
+ if (MOZ_LOG_TEST(gExtProtocolLog, LogLevel::Debug)) {
+ nsAutoCString appDirPath;
+ Unused << mAppDir->GetNativePath(appDirPath);
+ LOG("AppDir path: %s", appDirPath.get());
+ }
+ }
+
+ bool result = false;
+ if (mAppDir) {
+ MOZ_TRY(mAppDir->Contains(aExtensionDir, &result));
+ }
+ return result;
+}
+#endif /* !defined(XP_WIN) */
+
+static void LogExternalResourceError(nsIFile* aExtensionDir,
+ nsIFile* aRequestedFile) {
+ MOZ_ASSERT(aExtensionDir);
+ MOZ_ASSERT(aRequestedFile);
+
+ LOG("Rejecting external unpacked extension resource [%s] from "
+ "extension directory [%s]",
+ aRequestedFile->HumanReadablePath().get(),
+ aExtensionDir->HumanReadablePath().get());
+}
+
+Result<nsCOMPtr<nsIInputStream>, nsresult> ExtensionProtocolHandler::NewStream(
+ nsIURI* aChildURI, bool* aTerminateSender) {
+ MOZ_ASSERT(!IsNeckoChild());
+ MOZ_TRY(aChildURI ? NS_OK : NS_ERROR_INVALID_ARG);
+ MOZ_TRY(aTerminateSender ? NS_OK : NS_ERROR_INVALID_ARG);
+
+ *aTerminateSender = true;
+ nsresult rv;
+
+ // We should never receive a URI that isn't for a moz-extension because
+ // these requests ordinarily come from the child's ExtensionProtocolHandler.
+ // Ensure this request is for a moz-extension URI. A rogue child process
+ // could send us any URI.
+ if (!aChildURI->SchemeIs(EXTENSION_SCHEME)) {
+ return Err(NS_ERROR_UNKNOWN_PROTOCOL);
+ }
+
+ // For errors after this point, we want to propagate the error to
+ // the child, but we don't force the child to be terminated because
+ // the error is likely to be due to a bug in the extension.
+ *aTerminateSender = false;
+
+ /*
+ * Make sure there is a substitution installed for the host found
+ * in the child's request URI and make sure the host resolves to
+ * a directory.
+ */
+
+ nsAutoCString host;
+ MOZ_TRY(aChildURI->GetAsciiHost(host));
+
+ // Lookup the directory this host string resolves to
+ nsCOMPtr<nsIURI> baseURI;
+ MOZ_TRY(GetSubstitution(host, getter_AddRefs(baseURI)));
+
+ // The result should be a file URL for the extension base dir
+ nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(baseURI, &rv);
+ MOZ_TRY(rv);
+
+ nsCOMPtr<nsIFile> extensionDir;
+ MOZ_TRY(fileURL->GetFile(getter_AddRefs(extensionDir)));
+
+ bool isDirectory = false;
+ MOZ_TRY(extensionDir->IsDirectory(&isDirectory));
+ if (!isDirectory) {
+ // The host should map to a directory for unpacked extensions
+ return Err(NS_ERROR_FILE_NOT_DIRECTORY);
+ }
+
+ // Make sure the child URI resolves to a file URI then get a file
+ // channel for the request. The resultant channel should be a
+ // file channel because we only request remote streams for unpacked
+ // extension resource loads where the URI resolves to a file.
+ nsAutoCString resolvedSpec;
+ MOZ_TRY(ResolveURI(aChildURI, resolvedSpec));
+
+ nsAutoCString resolvedScheme;
+ MOZ_TRY(net_ExtractURLScheme(resolvedSpec, resolvedScheme));
+ if (!resolvedScheme.EqualsLiteral("file")) {
+ return Err(NS_ERROR_UNEXPECTED);
+ }
+
+ nsCOMPtr<nsIIOService> ioService = do_GetIOService(&rv);
+ MOZ_TRY(rv);
+
+ nsCOMPtr<nsIURI> resolvedURI;
+ MOZ_TRY(ioService->NewURI(resolvedSpec, nullptr, nullptr,
+ getter_AddRefs(resolvedURI)));
+
+ // We use the system principal to get a file channel for the request,
+ // but only after we've checked (above) that the child URI is of
+ // moz-extension scheme and that the URI host maps to a directory.
+ nsCOMPtr<nsIChannel> channel;
+ MOZ_TRY(NS_NewChannel(getter_AddRefs(channel), resolvedURI,
+ nsContentUtils::GetSystemPrincipal(),
+ nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_SEC_CONTEXT_IS_NULL,
+ nsIContentPolicy::TYPE_OTHER));
+
+ nsCOMPtr<nsIFileChannel> fileChannel = do_QueryInterface(channel, &rv);
+ MOZ_TRY(rv);
+
+ nsCOMPtr<nsIFile> requestedFile;
+ MOZ_TRY(fileChannel->GetFile(getter_AddRefs(requestedFile)));
+
+ /*
+ * Make sure the file we resolved to is within the extension directory.
+ */
+
+ // Normalize paths for sane comparisons. nsIFile::Contains depends on
+ // it for reliable subpath checks.
+ MOZ_TRY(extensionDir->Normalize());
+ MOZ_TRY(requestedFile->Normalize());
+#if defined(XP_WIN)
+ if (!widget::WinUtils::ResolveJunctionPointsAndSymLinks(extensionDir) ||
+ !widget::WinUtils::ResolveJunctionPointsAndSymLinks(requestedFile)) {
+ return Err(NS_ERROR_FILE_ACCESS_DENIED);
+ }
+#endif
+
+ bool isResourceFromExtensionDir = false;
+ MOZ_TRY(extensionDir->Contains(requestedFile, &isResourceFromExtensionDir));
+ if (!isResourceFromExtensionDir) {
+ bool isAllowed;
+ MOZ_TRY_VAR(isAllowed, AllowExternalResource(extensionDir, requestedFile));
+ if (!isAllowed) {
+ LogExternalResourceError(extensionDir, requestedFile);
+ return Err(NS_ERROR_FILE_ACCESS_DENIED);
+ }
+ }
+
+ nsCOMPtr<nsIInputStream> inputStream;
+ MOZ_TRY_VAR(inputStream,
+ NS_NewLocalFileInputStream(requestedFile, PR_RDONLY, -1,
+ nsIFileInputStream::DEFER_OPEN));
+
+ return inputStream;
+}
+
+Result<Ok, nsresult> ExtensionProtocolHandler::NewFD(
+ nsIURI* aChildURI, bool* aTerminateSender,
+ NeckoParent::GetExtensionFDResolver& aResolve) {
+ MOZ_ASSERT(!IsNeckoChild());
+ MOZ_TRY(aChildURI ? NS_OK : NS_ERROR_INVALID_ARG);
+ MOZ_TRY(aTerminateSender ? NS_OK : NS_ERROR_INVALID_ARG);
+
+ *aTerminateSender = true;
+ nsresult rv;
+
+ // Ensure this is a moz-extension URI
+ if (!aChildURI->SchemeIs(EXTENSION_SCHEME)) {
+ return Err(NS_ERROR_UNKNOWN_PROTOCOL);
+ }
+
+ // For errors after this point, we want to propagate the error to
+ // the child, but we don't force the child to be terminated.
+ *aTerminateSender = false;
+
+ nsAutoCString host;
+ MOZ_TRY(aChildURI->GetAsciiHost(host));
+
+ // We expect the host string to map to a JAR file because the URI
+ // should refer to a web accessible resource for an enabled extension.
+ nsCOMPtr<nsIURI> subURI;
+ MOZ_TRY(GetSubstitution(host, getter_AddRefs(subURI)));
+
+ nsCOMPtr<nsIJARURI> jarURI = do_QueryInterface(subURI, &rv);
+ MOZ_TRY(rv);
+
+ nsCOMPtr<nsIURI> innerFileURI;
+ MOZ_TRY(jarURI->GetJARFile(getter_AddRefs(innerFileURI)));
+
+ nsCOMPtr<nsIFileURL> innerFileURL = do_QueryInterface(innerFileURI, &rv);
+ MOZ_TRY(rv);
+
+ nsCOMPtr<nsIFile> jarFile;
+ MOZ_TRY(innerFileURL->GetFile(getter_AddRefs(jarFile)));
+
+ if (!mFileOpenerThread) {
+ mFileOpenerThread = new LazyIdleThread(DEFAULT_THREAD_TIMEOUT_MS,
+ "ExtensionProtocolHandler");
+ }
+
+ RefPtr<ExtensionJARFileOpener> fileOpener =
+ new ExtensionJARFileOpener(jarFile, aResolve);
+
+ nsCOMPtr<nsIRunnable> event = mozilla::NewRunnableMethod(
+ "ExtensionJarFileOpener", fileOpener, &ExtensionJARFileOpener::OpenFile);
+
+ MOZ_TRY(mFileOpenerThread->Dispatch(event, nsIEventTarget::DISPATCH_NORMAL));
+
+ return Ok();
+}
+
+// Set the channel's content type using the provided URI's type
+
+// static
+void ExtensionProtocolHandler::SetContentType(nsIURI* aURI,
+ nsIChannel* aChannel) {
+ nsresult rv;
+ nsCOMPtr<nsIMIMEService> mime = do_GetService("@mozilla.org/mime;1", &rv);
+ if (NS_SUCCEEDED(rv)) {
+ nsAutoCString contentType;
+ rv = mime->GetTypeFromURI(aURI, contentType);
+ if (NS_SUCCEEDED(rv)) {
+ Unused << aChannel->SetContentType(contentType);
+ }
+ }
+}
+
+// Gets a SimpleChannel that wraps the provided ExtensionStreamGetter
+
+// static
+void ExtensionProtocolHandler::NewSimpleChannel(
+ nsIURI* aURI, nsILoadInfo* aLoadinfo, ExtensionStreamGetter* aStreamGetter,
+ nsIChannel** aRetVal) {
+ nsCOMPtr<nsIChannel> channel = NS_NewSimpleChannel(
+ aURI, aLoadinfo, aStreamGetter,
+ [](nsIStreamListener* listener, nsIChannel* simpleChannel,
+ ExtensionStreamGetter* getter) -> RequestOrReason {
+ return getter->GetAsync(listener, simpleChannel);
+ });
+
+ SetContentType(aURI, channel);
+ channel.swap(*aRetVal);
+}
+
+// Gets a SimpleChannel that wraps the provided channel
+
+// static
+void ExtensionProtocolHandler::NewSimpleChannel(nsIURI* aURI,
+ nsILoadInfo* aLoadinfo,
+ nsIChannel* aChannel,
+ nsIChannel** aRetVal) {
+ nsCOMPtr<nsIChannel> channel = NS_NewSimpleChannel(
+ aURI, aLoadinfo, aChannel,
+ [](nsIStreamListener* listener, nsIChannel* simpleChannel,
+ nsIChannel* origChannel) -> RequestOrReason {
+ nsresult rv = origChannel->AsyncOpen(listener);
+ if (NS_FAILED(rv)) {
+ simpleChannel->Cancel(NS_BINDING_ABORTED);
+ return Err(rv);
+ }
+ nsCOMPtr<nsIRequest> request(origChannel);
+ return RequestOrCancelable(WrapNotNull(request));
+ });
+
+ SetContentType(aURI, channel);
+ channel.swap(*aRetVal);
+}
+
+void ExtensionProtocolHandler::SubstituteRemoteFileChannel(
+ nsIURI* aURI, nsILoadInfo* aLoadinfo, nsACString& aResolvedFileSpec,
+ nsIChannel** aRetVal) {
+ MOZ_ASSERT(IsNeckoChild());
+
+ RefPtr<ExtensionStreamGetter> streamGetter =
+ new ExtensionStreamGetter(aURI, aLoadinfo);
+
+ NewSimpleChannel(aURI, aLoadinfo, streamGetter, aRetVal);
+}
+
+static Result<Ok, nsresult> LogCacheCheck(const nsIJARChannel* aJarChannel,
+ nsIJARURI* aJarURI, bool aIsCached) {
+ nsresult rv;
+
+ nsCOMPtr<nsIURI> innerFileURI;
+ MOZ_TRY(aJarURI->GetJARFile(getter_AddRefs(innerFileURI)));
+
+ nsCOMPtr<nsIFileURL> innerFileURL = do_QueryInterface(innerFileURI, &rv);
+ MOZ_TRY(rv);
+
+ nsCOMPtr<nsIFile> jarFile;
+ MOZ_TRY(innerFileURL->GetFile(getter_AddRefs(jarFile)));
+
+ nsAutoCString uriSpec, jarSpec;
+ Unused << aJarURI->GetSpec(uriSpec);
+ Unused << innerFileURI->GetSpec(jarSpec);
+ LOG("[JARChannel %p] Cache %s: %s (%s)", aJarChannel,
+ aIsCached ? "hit" : "miss", uriSpec.get(), jarSpec.get());
+
+ return Ok();
+}
+
+Result<Ok, nsresult> ExtensionProtocolHandler::SubstituteRemoteJarChannel(
+ nsIURI* aURI, nsILoadInfo* aLoadinfo, nsACString& aResolvedSpec,
+ nsIChannel** aRetVal) {
+ MOZ_ASSERT(IsNeckoChild());
+ nsresult rv;
+
+ // Build a JAR URI for this jar:file:// URI and use it to extract the
+ // inner file URI.
+ nsCOMPtr<nsIURI> uri;
+ MOZ_TRY(NS_NewURI(getter_AddRefs(uri), aResolvedSpec));
+
+ nsCOMPtr<nsIJARURI> jarURI = do_QueryInterface(uri, &rv);
+ MOZ_TRY(rv);
+
+ nsCOMPtr<nsIJARChannel> jarChannel = do_QueryInterface(*aRetVal, &rv);
+ MOZ_TRY(rv);
+
+ bool isCached = false;
+ MOZ_TRY(jarChannel->EnsureCached(&isCached));
+ if (MOZ_LOG_TEST(gExtProtocolLog, LogLevel::Debug)) {
+ Unused << LogCacheCheck(jarChannel, jarURI, isCached);
+ }
+
+ if (isCached) {
+ // Using a SimpleChannel with an ExtensionStreamGetter here (like the
+ // non-cached JAR case) isn't needed to load the extension resource
+ // because we don't need to ask the parent for an FD for the JAR, but
+ // wrapping the JARChannel in a SimpleChannel allows HTTP forwarding to
+ // moz-extension URI's to work because HTTP forwarding requires the
+ // target channel implement nsIChildChannel.
+ NewSimpleChannel(aURI, aLoadinfo, jarChannel.get(), aRetVal);
+ return Ok();
+ }
+
+ nsCOMPtr<nsIURI> innerFileURI;
+ MOZ_TRY(jarURI->GetJARFile(getter_AddRefs(innerFileURI)));
+
+ nsCOMPtr<nsIFileURL> innerFileURL = do_QueryInterface(innerFileURI, &rv);
+ MOZ_TRY(rv);
+
+ nsCOMPtr<nsIFile> jarFile;
+ MOZ_TRY(innerFileURL->GetFile(getter_AddRefs(jarFile)));
+
+ RefPtr<ExtensionStreamGetter> streamGetter =
+ new ExtensionStreamGetter(aURI, aLoadinfo, jarChannel.forget(), jarFile);
+
+ NewSimpleChannel(aURI, aLoadinfo, streamGetter, aRetVal);
+ return Ok();
+}
+
+} // namespace net
+} // namespace mozilla