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/* -*- 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/ContentChild.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/Promise-inl.h"
#include "mozilla/ExtensionPolicyService.h"
#include "mozilla/FileUtils.h"
#include "mozilla/ipc/IPCStreamUtils.h"
#include "mozilla/ipc/URIUtils.h"
#include "mozilla/net/NeckoChild.h"
#include "mozilla/RefPtr.h"
#include "mozilla/ResultExtensions.h"
#include "FileDescriptor.h"
#include "FileDescriptorFile.h"
#include "LoadInfo.h"
#include "nsContentUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsDirectoryServiceDefs.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 : public RefCounted<ExtensionStreamGetter> {
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();
}
~ExtensionStreamGetter() = default;
void SetupEventTarget() {
mMainThreadEventTarget = nsContentUtils::GetEventTargetByLoadInfo(
mLoadInfo, TaskCategory::Other);
if (!mMainThreadEventTarget) {
mMainThreadEventTarget = GetMainThreadSerialEventTarget();
}
}
// Get an input stream or file descriptor from the parent asynchronously.
Result<Ok, nsresult> 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);
MOZ_DECLARE_REFCOUNTED_TYPENAME(ExtensionStreamGetter)
private:
nsCOMPtr<nsIURI> mURI;
nsCOMPtr<nsILoadInfo> mLoadInfo;
nsCOMPtr<nsIJARChannel> mJarChannel;
nsCOMPtr<nsIFile> mJarFile;
nsCOMPtr<nsIStreamListener> mListener;
nsCOMPtr<nsIChannel> mChannel;
nsCOMPtr<nsISerialEventTarget> mMainThreadEventTarget;
bool mIsJarChannel;
};
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.
Result<Ok, nsresult> ExtensionStreamGetter::GetAsync(
nsIStreamListener* aListener, nsIChannel* aChannel) {
MOZ_ASSERT(IsNeckoChild());
MOZ_ASSERT(mMainThreadEventTarget);
mListener = aListener;
mChannel = aChannel;
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 Ok();
}
// 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 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->Cancel(NS_BINDING_ABORTED);
}
// Handle an input stream sent from the parent.
void ExtensionStreamGetter::OnStream(already_AddRefed<nsIInputStream> aStream) {
MOZ_ASSERT(IsNeckoChild());
MOZ_ASSERT(mListener);
MOZ_ASSERT(mMainThreadEventTarget);
nsCOMPtr<nsIInputStream> stream = std::move(aStream);
// We must keep an owning reference to the listener
// until we pass it on to AsyncRead.
nsCOMPtr<nsIStreamListener> listener = std::move(mListener);
MOZ_ASSERT(mChannel);
if (!stream) {
// The parent didn't send us back a stream.
CancelRequest(listener, mChannel, 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, mChannel, rv);
return;
}
rv = pump->AsyncRead(listener);
if (NS_FAILED(rv)) {
CancelRequest(listener, mChannel, rv);
}
}
// Handle an FD sent from the parent.
void ExtensionStreamGetter::OnFD(const FileDescriptor& aFD) {
MOZ_ASSERT(IsNeckoChild());
MOZ_ASSERT(mListener);
MOZ_ASSERT(mChannel);
if (!aFD.IsValid()) {
OnStream(nullptr);
return;
}
// We must keep an owning reference to the listener
// until we pass it on to AsyncOpen.
nsCOMPtr<nsIStreamListener> listener = std::move(mListener);
RefPtr<FileDescriptorFile> fdFile = new FileDescriptorFile(aFD, mJarFile);
mJarChannel->SetJarFile(fdFile);
nsresult rv = mJarChannel->AsyncOpen(listener);
if (NS_FAILED(rv)) {
CancelRequest(listener, mChannel, 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)
#if !defined(XP_WIN)
# if defined(XP_MACOSX)
,
mAlreadyCheckedDevRepo(false)
# endif /* XP_MACOSX */
,
mAlreadyCheckedAppDir(false)
#endif /* ! XP_WIN */
{
// 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 a
// whitelisted subset are web-accessible (and cross-origin fetchable). Check
// that whitelist.
if (policy->IsPathWebAccessible(url.FilePath())) {
flags |= URI_LOADABLE_BY_ANYONE | URI_FETCHABLE_BY_ANYONE;
} 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");
// 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::HandleValue aValue,
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));
}
return RequestOrReason(origChannel);
});
} else if (readyPromise) {
size_t matchIdx;
if (BinarySearchIf(
sStaticFileExtensions, 0, ArrayLength(sStaticFileExtensions),
[&ext](const char* aOther) { return ext.Compare(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);
});
return RequestOrReason(origChannel);
});
} 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, dev builds don't use symlinks so we never need to
// allow a resource from outside of the extension dir.
return false;
#else
if (!mozilla::IsDevelopmentBuild()) {
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::IsDevelopmentBuild());
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::IsDevelopmentBuild());
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(NS_NewLocalFileInputStream(getter_AddRefs(inputStream), 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"_ns);
}
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 {
MOZ_TRY(getter->GetAsync(listener, simpleChannel));
return RequestOrReason(nullptr);
});
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);
}
return RequestOrReason(origChannel);
});
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