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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
/* 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 "MainThreadUtils.h"
#include "mozilla/ExtensionPolicyService.h"
#include "mozilla/extensions/DocumentObserver.h"
#include "mozilla/extensions/WebExtensionContentScript.h"
#include "mozilla/extensions/WebExtensionPolicy.h"
#include "mozilla/AddonManagerWebAPI.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/dom/WindowGlobalChild.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/StaticPrefs_extensions.h"
#include "mozilla/Try.h"
#include "nsContentUtils.h"
#include "nsEscape.h"
#include "nsGlobalWindowInner.h"
#include "nsIObserver.h"
#include "nsISubstitutingProtocolHandler.h"
#include "nsLiteralString.h"
#include "nsNetUtil.h"
#include "nsPrintfCString.h"
namespace mozilla {
namespace extensions {
using namespace dom;
static const char kProto[] = "moz-extension";
static const char kBackgroundScriptTypeDefault[] = "text/javascript";
static const char kBackgroundScriptTypeModule[] = "module";
static const char kBackgroundPageHTMLStart[] =
"<!DOCTYPE html>\n\
<html>\n\
<head><meta charset=\"utf-8\"></head>\n\
<body>";
static const char kBackgroundPageHTMLScript[] =
"\n\
<script type=\"%s\" src=\"%s\"></script>";
static const char kBackgroundPageHTMLEnd[] =
"\n\
</body>\n\
</html>";
#define BASE_CSP_PREF_V2 "extensions.webextensions.base-content-security-policy"
#define DEFAULT_BASE_CSP_V2 \
"moz-extension: blob: filesystem: 'unsafe-eval' 'wasm-unsafe-eval' " \
"'unsafe-inline';"
#define BASE_CSP_PREF_V3 \
"extensions.webextensions.base-content-security-policy.v3"
#define DEFAULT_BASE_CSP_V3 "script-src 'self' 'wasm-unsafe-eval';"
static inline ExtensionPolicyService& EPS() {
return ExtensionPolicyService::GetSingleton();
}
static nsISubstitutingProtocolHandler* Proto() {
static nsCOMPtr<nsISubstitutingProtocolHandler> sHandler;
if (MOZ_UNLIKELY(!sHandler)) {
nsCOMPtr<nsIIOService> ios = do_GetIOService();
MOZ_RELEASE_ASSERT(ios);
nsCOMPtr<nsIProtocolHandler> handler;
ios->GetProtocolHandler(kProto, getter_AddRefs(handler));
sHandler = do_QueryInterface(handler);
MOZ_RELEASE_ASSERT(sHandler);
ClearOnShutdown(&sHandler);
}
return sHandler;
}
bool ParseGlobs(GlobalObject& aGlobal,
Sequence<OwningMatchGlobOrUTF8String> aGlobs,
nsTArray<RefPtr<MatchGlobCore>>& aResult, ErrorResult& aRv) {
for (auto& elem : aGlobs) {
if (elem.IsMatchGlob()) {
aResult.AppendElement(elem.GetAsMatchGlob()->Core());
} else {
RefPtr<MatchGlobCore> glob =
new MatchGlobCore(elem.GetAsUTF8String(), true, false, aRv);
if (aRv.Failed()) {
return false;
}
aResult.AppendElement(glob);
}
}
return true;
}
enum class ErrorBehavior {
CreateEmptyPattern,
Fail,
};
already_AddRefed<MatchPatternSet> ParseMatches(
GlobalObject& aGlobal,
const OwningMatchPatternSetOrStringSequence& aMatches,
const MatchPatternOptions& aOptions, ErrorBehavior aErrorBehavior,
ErrorResult& aRv) {
if (aMatches.IsMatchPatternSet()) {
return do_AddRef(aMatches.GetAsMatchPatternSet().get());
}
const auto& strings = aMatches.GetAsStringSequence();
nsTArray<OwningStringOrMatchPattern> patterns;
if (!patterns.SetCapacity(strings.Length(), fallible)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return nullptr;
}
for (auto& string : strings) {
OwningStringOrMatchPattern elt;
elt.SetAsString() = string;
patterns.AppendElement(elt);
}
RefPtr<MatchPatternSet> result =
MatchPatternSet::Constructor(aGlobal, patterns, aOptions, aRv);
if (aRv.Failed() && aErrorBehavior == ErrorBehavior::CreateEmptyPattern) {
aRv.SuppressException();
result = MatchPatternSet::Constructor(aGlobal, {}, aOptions, aRv);
}
return result.forget();
}
WebAccessibleResource::WebAccessibleResource(
GlobalObject& aGlobal, const WebAccessibleResourceInit& aInit,
ErrorResult& aRv) {
ParseGlobs(aGlobal, aInit.mResources, mWebAccessiblePaths, aRv);
if (aRv.Failed()) {
return;
}
if (!aInit.mMatches.IsNull()) {
MatchPatternOptions options;
options.mRestrictSchemes = true;
RefPtr<MatchPatternSet> matches =
ParseMatches(aGlobal, aInit.mMatches.Value(), options,
ErrorBehavior::CreateEmptyPattern, aRv);
MOZ_DIAGNOSTIC_ASSERT(!aRv.Failed());
mMatches = matches->Core();
}
if (!aInit.mExtension_ids.IsNull()) {
mExtensionIDs = new AtomSet(aInit.mExtension_ids.Value());
}
}
bool WebAccessibleResource::IsExtensionMatch(const URLInfo& aURI) {
if (!mExtensionIDs) {
return false;
}
RefPtr<WebExtensionPolicyCore> policy =
ExtensionPolicyService::GetCoreByHost(aURI.Host());
return policy && (mExtensionIDs->Contains(nsGkAtoms::_asterisk) ||
mExtensionIDs->Contains(policy->Id()));
}
/*****************************************************************************
* WebExtensionPolicyCore
*****************************************************************************/
WebExtensionPolicyCore::WebExtensionPolicyCore(GlobalObject& aGlobal,
WebExtensionPolicy* aPolicy,
const WebExtensionInit& aInit,
ErrorResult& aRv)
: mPolicy(aPolicy),
mId(NS_AtomizeMainThread(aInit.mId)),
mName(aInit.mName),
mType(NS_AtomizeMainThread(aInit.mType)),
mManifestVersion(aInit.mManifestVersion),
mExtensionPageCSP(aInit.mExtensionPageCSP),
mIsPrivileged(aInit.mIsPrivileged),
mTemporarilyInstalled(aInit.mTemporarilyInstalled),
mBackgroundWorkerScript(aInit.mBackgroundWorkerScript),
mIgnoreQuarantine(aInit.mIsPrivileged || aInit.mIgnoreQuarantine),
mPermissions(new AtomSet(aInit.mPermissions)) {
// In practice this is not necessary, but in tests where the uuid
// passed in is not lowercased various tests can fail.
ToLowerCase(aInit.mMozExtensionHostname, mHostname);
// Initialize the base CSP and extension page CSP
if (mManifestVersion < 3) {
nsresult rv = Preferences::GetString(BASE_CSP_PREF_V2, mBaseCSP);
if (NS_FAILED(rv)) {
mBaseCSP = NS_LITERAL_STRING_FROM_CSTRING(DEFAULT_BASE_CSP_V2);
}
} else {
nsresult rv = Preferences::GetString(BASE_CSP_PREF_V3, mBaseCSP);
if (NS_FAILED(rv)) {
mBaseCSP = NS_LITERAL_STRING_FROM_CSTRING(DEFAULT_BASE_CSP_V3);
}
}
if (mExtensionPageCSP.IsVoid()) {
if (mManifestVersion < 3) {
EPS().GetDefaultCSP(mExtensionPageCSP);
} else {
EPS().GetDefaultCSPV3(mExtensionPageCSP);
}
}
mWebAccessibleResources.SetCapacity(aInit.mWebAccessibleResources.Length());
for (const auto& resourceInit : aInit.mWebAccessibleResources) {
RefPtr<WebAccessibleResource> resource =
new WebAccessibleResource(aGlobal, resourceInit, aRv);
if (aRv.Failed()) {
return;
}
mWebAccessibleResources.AppendElement(std::move(resource));
}
nsresult rv = NS_NewURI(getter_AddRefs(mBaseURI), aInit.mBaseURL);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
}
}
bool WebExtensionPolicyCore::SourceMayAccessPath(
const URLInfo& aURI, const nsACString& aPath) const {
if (aURI.Scheme() == nsGkAtoms::moz_extension &&
MozExtensionHostname().Equals(aURI.Host())) {
// An extension can always access it's own paths.
return true;
}
// Bug 1786564 Static themes need to allow access to theme resources.
if (Type() == nsGkAtoms::theme) {
RefPtr<WebExtensionPolicyCore> policyCore =
ExtensionPolicyService::GetCoreByHost(aURI.Host());
return policyCore != nullptr;
}
if (ManifestVersion() < 3) {
return IsWebAccessiblePath(aPath);
}
for (const auto& resource : mWebAccessibleResources) {
if (resource->SourceMayAccessPath(aURI, aPath)) {
return true;
}
}
return false;
}
bool WebExtensionPolicyCore::CanAccessURI(const URLInfo& aURI, bool aExplicit,
bool aCheckRestricted,
bool aAllowFilePermission) const {
if (aCheckRestricted && WebExtensionPolicy::IsRestrictedURI(aURI)) {
return false;
}
if (aCheckRestricted && QuarantinedFromURI(aURI)) {
return false;
}
if (!aAllowFilePermission && aURI.Scheme() == nsGkAtoms::file) {
return false;
}
AutoReadLock lock(mLock);
return mHostPermissions && mHostPermissions->Matches(aURI, aExplicit);
}
bool WebExtensionPolicyCore::QuarantinedFromDoc(const DocInfo& aDoc) const {
return QuarantinedFromURI(aDoc.PrincipalURL());
}
bool WebExtensionPolicyCore::QuarantinedFromURI(const URLInfo& aURI) const {
return !IgnoreQuarantine() && WebExtensionPolicy::IsQuarantinedURI(aURI);
}
/*****************************************************************************
* WebExtensionPolicy
*****************************************************************************/
WebExtensionPolicy::WebExtensionPolicy(GlobalObject& aGlobal,
const WebExtensionInit& aInit,
ErrorResult& aRv)
: mCore(new WebExtensionPolicyCore(aGlobal, this, aInit, aRv)),
mLocalizeCallback(aInit.mLocalizeCallback) {
if (aRv.Failed()) {
return;
}
MatchPatternOptions options;
options.mRestrictSchemes = !HasPermission(nsGkAtoms::mozillaAddons);
// Set host permissions with SetAllowedOrigins to make sure the copy in core
// and WebExtensionPolicy stay in sync.
RefPtr<MatchPatternSet> hostPermissions =
ParseMatches(aGlobal, aInit.mAllowedOrigins, options,
ErrorBehavior::CreateEmptyPattern, aRv);
if (aRv.Failed()) {
return;
}
SetAllowedOrigins(*hostPermissions);
if (!aInit.mBackgroundScripts.IsNull()) {
mBackgroundScripts.SetValue().AppendElements(
aInit.mBackgroundScripts.Value());
}
mBackgroundTypeModule = aInit.mBackgroundTypeModule;
mContentScripts.SetCapacity(aInit.mContentScripts.Length());
for (const auto& scriptInit : aInit.mContentScripts) {
// The activeTab permission is only for dynamically injected scripts,
// it cannot be used for declarative content scripts.
if (scriptInit.mHasActiveTabPermission) {
aRv.Throw(NS_ERROR_INVALID_ARG);
return;
}
RefPtr<WebExtensionContentScript> contentScript =
new WebExtensionContentScript(aGlobal, *this, scriptInit, aRv);
if (aRv.Failed()) {
return;
}
mContentScripts.AppendElement(std::move(contentScript));
}
if (aInit.mReadyPromise.WasPassed()) {
mReadyPromise = &aInit.mReadyPromise.Value();
}
}
already_AddRefed<WebExtensionPolicy> WebExtensionPolicy::Constructor(
GlobalObject& aGlobal, const WebExtensionInit& aInit, ErrorResult& aRv) {
RefPtr<WebExtensionPolicy> policy =
new WebExtensionPolicy(aGlobal, aInit, aRv);
if (aRv.Failed()) {
return nullptr;
}
return policy.forget();
}
/* static */
void WebExtensionPolicy::GetActiveExtensions(
dom::GlobalObject& aGlobal,
nsTArray<RefPtr<WebExtensionPolicy>>& aResults) {
EPS().GetAll(aResults);
}
/* static */
already_AddRefed<WebExtensionPolicy> WebExtensionPolicy::GetByID(
dom::GlobalObject& aGlobal, const nsAString& aID) {
return do_AddRef(EPS().GetByID(aID));
}
/* static */
already_AddRefed<WebExtensionPolicy> WebExtensionPolicy::GetByHostname(
dom::GlobalObject& aGlobal, const nsACString& aHostname) {
return do_AddRef(EPS().GetByHost(aHostname));
}
/* static */
already_AddRefed<WebExtensionPolicy> WebExtensionPolicy::GetByURI(
dom::GlobalObject& aGlobal, nsIURI* aURI) {
return do_AddRef(EPS().GetByURL(aURI));
}
void WebExtensionPolicy::SetActive(bool aActive, ErrorResult& aRv) {
if (aActive == mActive) {
return;
}
bool ok = aActive ? Enable() : Disable();
if (!ok) {
aRv.Throw(NS_ERROR_UNEXPECTED);
}
}
bool WebExtensionPolicy::Enable() {
MOZ_ASSERT(!mActive);
if (!EPS().RegisterExtension(*this)) {
return false;
}
if (XRE_IsParentProcess()) {
// Reserve a BrowsingContextGroup for use by this WebExtensionPolicy.
RefPtr<BrowsingContextGroup> group = BrowsingContextGroup::Create();
mBrowsingContextGroup = group->MakeKeepAlivePtr();
}
Unused << Proto()->SetSubstitution(MozExtensionHostname(), BaseURI());
mActive = true;
return true;
}
bool WebExtensionPolicy::Disable() {
MOZ_ASSERT(mActive);
MOZ_ASSERT(EPS().GetByID(Id()) == this);
if (!EPS().UnregisterExtension(*this)) {
return false;
}
if (XRE_IsParentProcess()) {
// Clear our BrowsingContextGroup reference. A new instance will be created
// when the extension is next activated.
mBrowsingContextGroup = nullptr;
}
Unused << Proto()->SetSubstitution(MozExtensionHostname(), nullptr);
mActive = false;
return true;
}
void WebExtensionPolicy::GetURL(const nsAString& aPath, nsAString& aResult,
ErrorResult& aRv) const {
auto result = GetURL(aPath);
if (result.isOk()) {
aResult = result.unwrap();
} else {
aRv.Throw(result.unwrapErr());
}
}
Result<nsString, nsresult> WebExtensionPolicy::GetURL(
const nsAString& aPath) const {
nsPrintfCString spec("%s://%s/", kProto, MozExtensionHostname().get());
nsCOMPtr<nsIURI> uri;
MOZ_TRY(NS_NewURI(getter_AddRefs(uri), spec));
MOZ_TRY(uri->Resolve(NS_ConvertUTF16toUTF8(aPath), spec));
return NS_ConvertUTF8toUTF16(spec);
}
void WebExtensionPolicy::SetIgnoreQuarantine(bool aIgnore) {
WebExtensionPolicy_Binding::ClearCachedIgnoreQuarantineValue(this);
mCore->SetIgnoreQuarantine(aIgnore);
}
void WebExtensionPolicy::RegisterContentScript(
WebExtensionContentScript& script, ErrorResult& aRv) {
// Raise an "invalid argument" error if the script is not related to
// the expected extension or if it is already registered.
if (script.mExtension != this || mContentScripts.Contains(&script)) {
aRv.Throw(NS_ERROR_INVALID_ARG);
return;
}
RefPtr<WebExtensionContentScript> newScript = &script;
if (!mContentScripts.AppendElement(std::move(newScript), fallible)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
WebExtensionPolicy_Binding::ClearCachedContentScriptsValue(this);
}
void WebExtensionPolicy::UnregisterContentScript(
const WebExtensionContentScript& script, ErrorResult& aRv) {
if (script.mExtension != this || !mContentScripts.RemoveElement(&script)) {
aRv.Throw(NS_ERROR_INVALID_ARG);
return;
}
WebExtensionPolicy_Binding::ClearCachedContentScriptsValue(this);
}
void WebExtensionPolicy::SetAllowedOrigins(MatchPatternSet& aAllowedOrigins) {
// Make sure to keep the version in `WebExtensionPolicy` (which can be exposed
// back to script using AllowedOrigins()), and the version in
// `WebExtensionPolicyCore` (which is threadsafe) in sync.
AutoWriteLock lock(mCore->mLock);
mHostPermissions = &aAllowedOrigins;
mCore->mHostPermissions = aAllowedOrigins.Core();
}
void WebExtensionPolicy::InjectContentScripts(ErrorResult& aRv) {
nsresult rv = EPS().InjectContentScripts(this);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
}
}
/* static */
bool WebExtensionPolicy::UseRemoteWebExtensions(GlobalObject& aGlobal) {
return EPS().UseRemoteExtensions();
}
/* static */
bool WebExtensionPolicy::IsExtensionProcess(GlobalObject& aGlobal) {
return EPS().IsExtensionProcess();
}
/* static */
bool WebExtensionPolicy::BackgroundServiceWorkerEnabled(GlobalObject& aGlobal) {
// When MOZ_WEBEXT_WEBIDL_ENABLED is not set at compile time, extension APIs
// are not available to extension service workers. To avoid confusion, the
// extensions.backgroundServiceWorkerEnabled.enabled pref is locked to false
// in modules/libpref/init/all.js when MOZ_WEBEXT_WEBIDL_ENABLED is not set.
return StaticPrefs::extensions_backgroundServiceWorker_enabled_AtStartup();
}
/* static */
bool WebExtensionPolicy::QuarantinedDomainsEnabled(GlobalObject& aGlobal) {
return EPS().GetQuarantinedDomainsEnabled();
}
/* static */
bool WebExtensionPolicy::IsRestrictedDoc(const DocInfo& aDoc) {
if (aDoc.Principal() && aDoc.Principal()->IsSystemPrincipal()) {
return true;
}
return IsRestrictedURI(aDoc.PrincipalURL());
}
/* static */
bool WebExtensionPolicy::IsRestrictedURI(const URLInfo& aURI) {
RefPtr<AtomSet> restrictedDomains =
ExtensionPolicyService::RestrictedDomains();
if (restrictedDomains && restrictedDomains->Contains(aURI.HostAtom())) {
return true;
}
if (AddonManagerWebAPI::IsValidSite(aURI.URI())) {
return true;
}
return false;
}
/* static */
bool WebExtensionPolicy::IsQuarantinedDoc(const DocInfo& aDoc) {
return IsQuarantinedURI(aDoc.PrincipalURL());
}
/* static */
bool WebExtensionPolicy::IsQuarantinedURI(const URLInfo& aURI) {
// Ensure EPS is initialized before asking it about quarantined domains.
Unused << EPS();
RefPtr<AtomSet> quarantinedDomains =
ExtensionPolicyService::QuarantinedDomains();
return quarantinedDomains && quarantinedDomains->Contains(aURI.HostAtom());
}
nsCString WebExtensionPolicy::BackgroundPageHTML() const {
nsCString result;
if (mBackgroundScripts.IsNull()) {
result.SetIsVoid(true);
return result;
}
result.AppendLiteral(kBackgroundPageHTMLStart);
const char* scriptType = mBackgroundTypeModule ? kBackgroundScriptTypeModule
: kBackgroundScriptTypeDefault;
for (auto& script : mBackgroundScripts.Value()) {
nsCString escaped;
nsAppendEscapedHTML(NS_ConvertUTF16toUTF8(script), escaped);
result.AppendPrintf(kBackgroundPageHTMLScript, scriptType, escaped.get());
}
result.AppendLiteral(kBackgroundPageHTMLEnd);
return result;
}
void WebExtensionPolicy::Localize(const nsAString& aInput,
nsString& aOutput) const {
RefPtr<WebExtensionLocalizeCallback> callback(mLocalizeCallback);
callback->Call(aInput, aOutput);
}
JSObject* WebExtensionPolicy::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return WebExtensionPolicy_Binding::Wrap(aCx, this, aGivenProto);
}
void WebExtensionPolicy::GetContentScripts(
nsTArray<RefPtr<WebExtensionContentScript>>& aScripts) const {
aScripts.AppendElements(mContentScripts);
}
bool WebExtensionPolicy::PrivateBrowsingAllowed() const {
return HasPermission(nsGkAtoms::privateBrowsingAllowedPermission);
}
bool WebExtensionPolicy::CanAccessContext(nsILoadContext* aContext) const {
MOZ_ASSERT(aContext);
return PrivateBrowsingAllowed() || !aContext->UsePrivateBrowsing();
}
bool WebExtensionPolicy::CanAccessWindow(
const dom::WindowProxyHolder& aWindow) const {
if (PrivateBrowsingAllowed()) {
return true;
}
// match browsing mode with policy
nsIDocShell* docShell = aWindow.get()->GetDocShell();
nsCOMPtr<nsILoadContext> loadContext = do_QueryInterface(docShell);
return !(loadContext && loadContext->UsePrivateBrowsing());
}
void WebExtensionPolicy::GetReadyPromise(
JSContext* aCx, JS::MutableHandle<JSObject*> aResult) const {
if (mReadyPromise) {
aResult.set(mReadyPromise->PromiseObj());
} else {
aResult.set(nullptr);
}
}
uint64_t WebExtensionPolicy::GetBrowsingContextGroupId() const {
MOZ_ASSERT(XRE_IsParentProcess() && mActive);
return mBrowsingContextGroup ? mBrowsingContextGroup->Id() : 0;
}
uint64_t WebExtensionPolicy::GetBrowsingContextGroupId(ErrorResult& aRv) {
if (XRE_IsParentProcess() && mActive) {
return GetBrowsingContextGroupId();
}
aRv.ThrowInvalidAccessError(
"browsingContextGroupId only available for active policies in the "
"parent process");
return 0;
}
WebExtensionPolicy::~WebExtensionPolicy() { mCore->ClearPolicyWeakRef(); }
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(WebExtensionPolicy)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(WebExtensionPolicy)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mBrowsingContextGroup)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mLocalizeCallback)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mHostPermissions)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mContentScripts)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
AssertIsOnMainThread();
tmp->mCore->ClearPolicyWeakRef();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(WebExtensionPolicy)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mBrowsingContextGroup)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLocalizeCallback)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mHostPermissions)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mContentScripts)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(WebExtensionPolicy)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(WebExtensionPolicy)
NS_IMPL_CYCLE_COLLECTING_RELEASE(WebExtensionPolicy)
/*****************************************************************************
* WebExtensionContentScript / MozDocumentMatcher
*****************************************************************************/
/* static */
already_AddRefed<MozDocumentMatcher> MozDocumentMatcher::Constructor(
GlobalObject& aGlobal, const dom::MozDocumentMatcherInit& aInit,
ErrorResult& aRv) {
RefPtr<MozDocumentMatcher> matcher =
new MozDocumentMatcher(aGlobal, aInit, false, aRv);
if (aRv.Failed()) {
return nullptr;
}
return matcher.forget();
}
/* static */
already_AddRefed<WebExtensionContentScript>
WebExtensionContentScript::Constructor(GlobalObject& aGlobal,
WebExtensionPolicy& aExtension,
const ContentScriptInit& aInit,
ErrorResult& aRv) {
RefPtr<WebExtensionContentScript> script =
new WebExtensionContentScript(aGlobal, aExtension, aInit, aRv);
if (aRv.Failed()) {
return nullptr;
}
return script.forget();
}
MozDocumentMatcher::MozDocumentMatcher(GlobalObject& aGlobal,
const dom::MozDocumentMatcherInit& aInit,
bool aRestricted, ErrorResult& aRv)
: mHasActiveTabPermission(aInit.mHasActiveTabPermission),
mRestricted(aRestricted),
mAllFrames(aInit.mAllFrames),
mCheckPermissions(aInit.mCheckPermissions),
mFrameID(aInit.mFrameID),
mMatchAboutBlank(aInit.mMatchAboutBlank || aInit.mMatchOriginAsFallback),
mMatchOriginAsFallback(aInit.mMatchOriginAsFallback) {
MatchPatternOptions options;
options.mRestrictSchemes = mRestricted;
mMatches = ParseMatches(aGlobal, aInit.mMatches, options,
ErrorBehavior::CreateEmptyPattern, aRv);
if (aRv.Failed()) {
return;
}
if (!aInit.mExcludeMatches.IsNull()) {
mExcludeMatches =
ParseMatches(aGlobal, aInit.mExcludeMatches.Value(), options,
ErrorBehavior::CreateEmptyPattern, aRv);
if (aRv.Failed()) {
return;
}
}
if (!aInit.mIncludeGlobs.IsNull()) {
if (!ParseGlobs(aGlobal, aInit.mIncludeGlobs.Value(),
mIncludeGlobs.SetValue(), aRv)) {
return;
}
}
if (!aInit.mExcludeGlobs.IsNull()) {
if (!ParseGlobs(aGlobal, aInit.mExcludeGlobs.Value(),
mExcludeGlobs.SetValue(), aRv)) {
return;
}
}
if (!aInit.mOriginAttributesPatterns.IsNull()) {
Sequence<OriginAttributesPattern>& arr =
mOriginAttributesPatterns.SetValue();
for (const auto& pattern : aInit.mOriginAttributesPatterns.Value()) {
if (!arr.AppendElement(OriginAttributesPattern(pattern), fallible)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
}
}
}
WebExtensionContentScript::WebExtensionContentScript(
GlobalObject& aGlobal, WebExtensionPolicy& aExtension,
const ContentScriptInit& aInit, ErrorResult& aRv)
: MozDocumentMatcher(aGlobal, aInit,
!aExtension.HasPermission(nsGkAtoms::mozillaAddons),
aRv),
mRunAt(aInit.mRunAt),
mWorld(aInit.mWorld) {
mCssPaths.Assign(aInit.mCssPaths);
mJsPaths.Assign(aInit.mJsPaths);
mExtension = &aExtension;
// Origin permissions are optional in mv3, so always check them at runtime.
if (mExtension->ManifestVersion() >= 3) {
mCheckPermissions = true;
}
}
bool MozDocumentMatcher::Matches(const DocInfo& aDoc,
bool aIgnorePermissions) const {
if (!mFrameID.IsNull()) {
if (aDoc.FrameID() != mFrameID.Value()) {
return false;
}
} else {
if (!mAllFrames && !aDoc.IsTopLevel()) {
return false;
}
}
// match browsing mode with policy
nsCOMPtr<nsILoadContext> loadContext = aDoc.GetLoadContext();
if (loadContext && mExtension && !mExtension->CanAccessContext(loadContext)) {
return false;
}
if (loadContext && !mOriginAttributesPatterns.IsNull()) {
OriginAttributes docShellAttrs;
loadContext->GetOriginAttributes(docShellAttrs);
bool patternMatch = false;
for (const auto& pattern : mOriginAttributesPatterns.Value()) {
if (pattern.Matches(docShellAttrs)) {
patternMatch = true;
break;
}
}
if (!patternMatch) {
return false;
}
}
if (!mMatchAboutBlank && aDoc.URL().InheritsPrincipal()) {
return false;
}
// Top-level about:blank is a special case. Unlike about:blank frames/windows
// opened by web pages, these do not have an origin that could be matched by
// a match pattern (they have a null principal instead). To allow extensions
// that intend to run scripts "everywhere", consider the document matched if
// the match pattern describe a very broad pattern (such as "<all_urls>").
if (mMatchAboutBlank && aDoc.IsTopLevel() &&
(aDoc.URL().Spec().EqualsLiteral("about:blank") ||
aDoc.URL().Scheme() == nsGkAtoms::data) &&
aDoc.Principal() && aDoc.Principal()->GetIsNullPrincipal()) {
if (StaticPrefs::extensions_script_about_blank_without_permission()) {
return true;
}
if (mHasActiveTabPermission) {
return true;
}
if (mMatches->MatchesAllWebUrls() && mIncludeGlobs.IsNull()) {
// When mIncludeGlobs is present, mMatches does not necessarily match
// everything (except possibly if include_globs is just ["*"]). So we
// only match if mMatches is present without mIncludeGlobs.
return true;
}
// Continue below: when mMatchOriginAsFallback is true, a null principal
// with a precursor may result in a match with the specific pattern.
}
if (!mMatchOriginAsFallback && aDoc.RequiresMatchOriginAsFallback()) {
// TODO bug 1899134: We should unconditionally return false here. But we
// had accidental support for matching blob:-URLs (by the content
// principal's URL) for a long time, so we have a temporary pref to fall
// back to the original behavior if needed.
if (aDoc.URL().Scheme() != nsGkAtoms::blob || !mExtension ||
mExtension->ManifestVersion() != 2 ||
!StaticPrefs::
extensions_script_blob_without_match_origin_as_fallback()) {
return false;
}
// Fall-through implies that we have a MV2 extension and a blob:-URL, with
// extensions.script_blob_without_match_origin_as_fallback set to true.
}
if (mRestricted && WebExtensionPolicy::IsRestrictedDoc(aDoc)) {
return false;
}
if (mRestricted && mExtension && mExtension->QuarantinedFromDoc(aDoc)) {
return false;
}
auto& urlinfo = aDoc.PrincipalURL();
if (mExtension && mExtension->ManifestVersion() >= 3) {
// In MV3, activeTab only allows access to same-origin iframes.
if (mHasActiveTabPermission && aDoc.IsSameOriginWithTop() &&
MatchPattern::MatchesAllURLs(urlinfo)) {
return true;
}
} else {
if (mHasActiveTabPermission && aDoc.ShouldMatchActiveTabPermission() &&
MatchPattern::MatchesAllURLs(urlinfo)) {
return true;
}
}
return MatchesURI(urlinfo, aIgnorePermissions);
}
bool MozDocumentMatcher::MatchesURI(const URLInfo& aURL,
bool aIgnorePermissions) const {
MOZ_ASSERT((!mRestricted && !mCheckPermissions) || mExtension);
if (!mMatches->Matches(aURL)) {
return false;
}
if (mExcludeMatches && mExcludeMatches->Matches(aURL)) {
return false;
}
if (!mIncludeGlobs.IsNull() && !mIncludeGlobs.Value().Matches(aURL.CSpec())) {
return false;
}
if (!mExcludeGlobs.IsNull() && mExcludeGlobs.Value().Matches(aURL.CSpec())) {
return false;
}
if (mRestricted && WebExtensionPolicy::IsRestrictedURI(aURL)) {
return false;
}
if (mRestricted && mExtension->QuarantinedFromURI(aURL)) {
return false;
}
if (mCheckPermissions && !aIgnorePermissions &&
!mExtension->CanAccessURI(aURL, false, false, true)) {
return false;
}
return true;
}
bool MozDocumentMatcher::MatchesWindowGlobal(WindowGlobalChild& aWindow,
bool aIgnorePermissions) const {
if (aWindow.IsClosed() || !aWindow.IsCurrentGlobal()) {
return false;
}
nsGlobalWindowInner* inner = aWindow.GetWindowGlobal();
if (!inner || !inner->GetDocShell()) {
return false;
}
return Matches(inner->GetOuterWindow(), aIgnorePermissions);
}
void MozDocumentMatcher::GetOriginAttributesPatterns(
JSContext* aCx, JS::MutableHandle<JS::Value> aVal,
ErrorResult& aError) const {
if (!ToJSValue(aCx, mOriginAttributesPatterns, aVal)) {
aError.NoteJSContextException(aCx);
}
}
JSObject* MozDocumentMatcher::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return MozDocumentMatcher_Binding::Wrap(aCx, this, aGivenProto);
}
JSObject* WebExtensionContentScript::WrapObject(
JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
return WebExtensionContentScript_Binding::Wrap(aCx, this, aGivenProto);
}
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(MozDocumentMatcher, mMatches,
mExcludeMatches, mExtension)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MozDocumentMatcher)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(MozDocumentMatcher)
NS_IMPL_CYCLE_COLLECTING_RELEASE(MozDocumentMatcher)
/*****************************************************************************
* MozDocumentObserver
*****************************************************************************/
/* static */
already_AddRefed<DocumentObserver> DocumentObserver::Constructor(
GlobalObject& aGlobal, dom::MozDocumentCallback& aCallbacks) {
RefPtr<DocumentObserver> matcher =
new DocumentObserver(aGlobal.GetAsSupports(), aCallbacks);
return matcher.forget();
}
void DocumentObserver::Observe(
const dom::Sequence<OwningNonNull<MozDocumentMatcher>>& matchers,
ErrorResult& aRv) {
if (!EPS().RegisterObserver(*this)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
mMatchers.Clear();
for (auto& matcher : matchers) {
if (!mMatchers.AppendElement(matcher, fallible)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
}
}
void DocumentObserver::Disconnect() {
Unused << EPS().UnregisterObserver(*this);
}
void DocumentObserver::NotifyMatch(MozDocumentMatcher& aMatcher,
nsPIDOMWindowOuter* aWindow) {
IgnoredErrorResult rv;
mCallbacks->OnNewDocument(
aMatcher, WindowProxyHolder(aWindow->GetBrowsingContext()), rv);
}
void DocumentObserver::NotifyMatch(MozDocumentMatcher& aMatcher,
nsILoadInfo* aLoadInfo) {
IgnoredErrorResult rv;
mCallbacks->OnPreloadDocument(aMatcher, aLoadInfo, rv);
}
JSObject* DocumentObserver::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return MozDocumentObserver_Binding::Wrap(aCx, this, aGivenProto);
}
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(DocumentObserver, mCallbacks, mMatchers,
mParent)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DocumentObserver)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(DocumentObserver)
NS_IMPL_CYCLE_COLLECTING_RELEASE(DocumentObserver)
/*****************************************************************************
* DocInfo
*****************************************************************************/
DocInfo::DocInfo(const URLInfo& aURL, nsILoadInfo* aLoadInfo)
: mURL(aURL), mObj(AsVariant(aLoadInfo)) {}
DocInfo::DocInfo(nsPIDOMWindowOuter* aWindow)
: mURL(aWindow->GetDocumentURI()), mObj(AsVariant(aWindow)) {}
bool DocInfo::IsTopLevel() const {
if (mIsTopLevel.isNothing()) {
struct Matcher {
bool operator()(Window aWin) {
return aWin->GetBrowsingContext()->IsTop();
}
bool operator()(LoadInfo aLoadInfo) {
return aLoadInfo->GetIsTopLevelLoad();
}
};
mIsTopLevel.emplace(mObj.match(Matcher()));
}
return mIsTopLevel.ref();
}
bool WindowShouldMatchActiveTab(nsPIDOMWindowOuter* aWin) {
WindowContext* wc = aWin->GetCurrentInnerWindow()->GetWindowContext();
if (wc && wc->SameOriginWithTop()) {
// If the frame is same-origin to top, accept the match regardless of
// whether the frame was populated dynamically.
return true;
}
for (; wc; wc = wc->GetParentWindowContext()) {
BrowsingContext* bc = wc->GetBrowsingContext();
if (bc->IsTopContent()) {
return true;
}
if (bc->CreatedDynamically() || !wc->GetIsOriginalFrameSource()) {
return false;
}
}
MOZ_ASSERT_UNREACHABLE("Should reach top content before end of loop");
return false;
}
bool DocInfo::ShouldMatchActiveTabPermission() const {
struct Matcher {
bool operator()(Window aWin) { return WindowShouldMatchActiveTab(aWin); }
bool operator()(LoadInfo aLoadInfo) { return false; }
};
return mObj.match(Matcher());
}
bool DocInfo::IsSameOriginWithTop() const {
struct Matcher {
bool operator()(Window aWin) {
WindowContext* wc = aWin->GetCurrentInnerWindow()->GetWindowContext();
return wc && wc->SameOriginWithTop();
}
bool operator()(LoadInfo aLoadInfo) { return false; }
};
return mObj.match(Matcher());
}
uint64_t DocInfo::FrameID() const {
if (mFrameID.isNothing()) {
if (IsTopLevel()) {
mFrameID.emplace(0);
} else {
struct Matcher {
uint64_t operator()(Window aWin) {
return aWin->GetBrowsingContext()->Id();
}
uint64_t operator()(LoadInfo aLoadInfo) {
return aLoadInfo->GetBrowsingContextID();
}
};
mFrameID.emplace(mObj.match(Matcher()));
}
}
return mFrameID.ref();
}
nsIPrincipal* DocInfo::Principal() const {
if (mPrincipal.isNothing()) {
struct Matcher {
explicit Matcher(const DocInfo& aThis) : mThis(aThis) {}
const DocInfo& mThis;
nsIPrincipal* operator()(Window aWin) {
RefPtr<Document> doc = aWin->GetDoc();
return doc->NodePrincipal();
}
nsIPrincipal* operator()(LoadInfo aLoadInfo) {
// This method tries to return a principal when the principal cannot be
// derived from URL(). See PrincipalURL().
if (!(mThis.URL().InheritsPrincipal() ||
aLoadInfo->GetForceInheritPrincipal())) {
// E.g. http(s):-URLs, data:, or any other arbitrary scheme.
return nullptr;
}
// E.g. about:srcdoc. In this case the principal cannot be derived from
// the URL, so we return the most likely principal here.
if (auto principal = aLoadInfo->PrincipalToInherit()) {
return principal;
}
return aLoadInfo->TriggeringPrincipal();
}
};
mPrincipal.emplace(mObj.match(Matcher(*this)));
}
return mPrincipal.ref();
}
const URLInfo& DocInfo::PrincipalURL() const {
if (!Principal()) {
// This is only possible via non-DOMWindow (see Principal()). We may end up
// here via ExtensionPolicyService::CheckRequest(), called before a network
// request ("http-on-opening-request" / "document-on-opening-request").
// In practice, http(s):, about:srcdoc, data:, and blob: may reach here.
// about:blank (and javascript:) does not enter this code path.
//
// Falling back to the URL is almost always correct, except in these cases:
// - documents that end up having a null principal. We cannot know for sure,
// e.g. because it can be forced later by a http header (CSP sandbox).
// In this case we may preload when we should not.
//
// - URLs that contain the principal such as blob:-URLs. In theory we could
// extract the origin from the URL, but we do not for simplicity.
// In this case we do not preload even though we could.
// ( In practice, blob:-URLs can only be created and loaded by the same
// origin, so it is likely that the content script had been preloaded
// before for that document. )
return URL();
}
if (mPrincipalURL.isNothing()) {
nsIPrincipal* prin = Principal();
nsCOMPtr<nsIPrincipal> precursor;
if (prin->GetIsContentPrincipal()) {
// Most common case.
nsCOMPtr<nsIURI> uri;
BasePrincipal::Cast(prin)->GetURI(getter_AddRefs(uri));
mPrincipalURL.emplace(uri);
} else if (prin->GetIsNullPrincipal() && !URL().IsNonOpaqueURL() &&
(precursor = prin->GetPrecursorPrincipal()) &&
precursor->GetIsContentPrincipal()) {
// Use precursor from null principal, unless the URL itself is not opaque.
// We want to use URL() when IsNonOpaqueURL() because the URL may have
// more details such as path and query components, whereas the precursor
// URI only has an origin.
// This enables matching of sandboxed about:blank / about:srcdoc / blob:
// when match_origin_as_fallback:true is used.
nsCOMPtr<nsIURI> uri;
BasePrincipal::Cast(precursor)->GetURI(getter_AddRefs(uri));
mPrincipalURL.emplace(uri);
} else {
mPrincipalURL.emplace(URL());
}
}
return mPrincipalURL.ref();
}
bool DocInfo::RequiresMatchOriginAsFallback() const {
if (mRequiresMatchOriginAsFallback.isNothing()) {
mRequiresMatchOriginAsFallback.emplace(
// Special-case blob:-URLs because their principal is indistinguishable
// from the principals that created them.
URL().Scheme() == nsGkAtoms::blob ||
(Principal() && Principal()->GetIsNullPrincipal() &&
!URL().IsNonOpaqueURL()));
}
return mRequiresMatchOriginAsFallback.ref();
}
} // namespace extensions
} // namespace mozilla