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Diffstat (limited to 'dom/base/nsObjectLoadingContent.cpp')
| -rw-r--r-- | dom/base/nsObjectLoadingContent.cpp | 1840 |
1 files changed, 1840 insertions, 0 deletions
diff --git a/dom/base/nsObjectLoadingContent.cpp b/dom/base/nsObjectLoadingContent.cpp new file mode 100644 index 0000000000..0a2ea3e62d --- /dev/null +++ b/dom/base/nsObjectLoadingContent.cpp @@ -0,0 +1,1840 @@ +/* -*- 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/. */ +/* + * A base class implementing nsIObjectLoadingContent for use by + * various content nodes that want to provide plugin/document/image + * loading functionality (eg <embed>, <object>, etc). + */ + +// Interface headers +#include "imgLoader.h" +#include "nsIClassOfService.h" +#include "nsIConsoleService.h" +#include "nsIDocShell.h" +#include "mozilla/BasePrincipal.h" +#include "mozilla/dom/BindContext.h" +#include "mozilla/dom/Document.h" +#include "nsIExternalProtocolHandler.h" +#include "nsIPermissionManager.h" +#include "nsIHttpChannel.h" +#include "nsINestedURI.h" +#include "nsScriptSecurityManager.h" +#include "nsIURILoader.h" +#include "nsIScriptChannel.h" +#include "nsIAsyncVerifyRedirectCallback.h" +#include "nsIAppShell.h" +#include "nsIScriptError.h" +#include "nsSubDocumentFrame.h" + +#include "nsError.h" + +// Util headers +#include "mozilla/Logging.h" + +#include "nsContentPolicyUtils.h" +#include "nsContentUtils.h" +#include "nsDocShellLoadState.h" +#include "nsGkAtoms.h" +#include "nsThreadUtils.h" +#include "nsNetUtil.h" +#include "nsMimeTypes.h" +#include "nsStyleUtil.h" +#include "mozilla/Preferences.h" +#include "nsQueryObject.h" + +// Concrete classes +#include "nsFrameLoader.h" + +#include "nsObjectLoadingContent.h" + +#include "nsWidgetsCID.h" +#include "mozilla/BasicEvents.h" +#include "mozilla/Components.h" +#include "mozilla/LoadInfo.h" +#include "mozilla/dom/BindingUtils.h" +#include "mozilla/dom/Element.h" +#include "mozilla/dom/Event.h" +#include "mozilla/dom/ScriptSettings.h" +#include "mozilla/AsyncEventDispatcher.h" +#include "mozilla/EventDispatcher.h" +#include "mozilla/IMEStateManager.h" +#include "mozilla/widget/IMEData.h" +#include "mozilla/dom/ContentChild.h" +#include "mozilla/dom/HTMLEmbedElement.h" +#include "mozilla/dom/HTMLObjectElementBinding.h" +#include "mozilla/dom/HTMLObjectElement.h" +#include "mozilla/dom/UserActivation.h" +#include "mozilla/dom/nsCSPContext.h" +#include "mozilla/net/DocumentChannel.h" +#include "mozilla/net/UrlClassifierFeatureFactory.h" +#include "mozilla/PresShell.h" +#include "mozilla/ProfilerLabels.h" +#include "mozilla/StaticPrefs_browser.h" +#include "nsChannelClassifier.h" +#include "nsFocusManager.h" +#include "ReferrerInfo.h" +#include "nsIEffectiveTLDService.h" + +#ifdef XP_WIN +// Thanks so much, Microsoft! :( +# ifdef CreateEvent +# undef CreateEvent +# endif +#endif // XP_WIN + +static const char kPrefYoutubeRewrite[] = "plugins.rewrite_youtube_embeds"; + +using namespace mozilla; +using namespace mozilla::dom; +using namespace mozilla::net; + +static LogModule* GetObjectLog() { + static LazyLogModule sLog("objlc"); + return sLog; +} + +#define LOG(args) MOZ_LOG(GetObjectLog(), mozilla::LogLevel::Debug, args) +#define LOG_ENABLED() MOZ_LOG_TEST(GetObjectLog(), mozilla::LogLevel::Debug) + +static bool IsFlashMIME(const nsACString& aMIMEType) { + return aMIMEType.LowerCaseEqualsASCII("application/x-shockwave-flash") || + aMIMEType.LowerCaseEqualsASCII("application/futuresplash") || + aMIMEType.LowerCaseEqualsASCII("application/x-shockwave-flash-test"); +} + +static bool IsPluginMIME(const nsACString& aMIMEType) { + return IsFlashMIME(aMIMEType) || + aMIMEType.LowerCaseEqualsASCII("application/x-test"); +} + +/// +/// Runnables and helper classes +/// + +// Sets a object's mIsLoading bit to false when destroyed +class AutoSetLoadingToFalse { + public: + explicit AutoSetLoadingToFalse(nsObjectLoadingContent* aContent) + : mContent(aContent) {} + ~AutoSetLoadingToFalse() { mContent->mIsLoading = false; } + + private: + nsObjectLoadingContent* mContent; +}; + +/// +/// Helper functions +/// + +bool nsObjectLoadingContent::IsSuccessfulRequest(nsIRequest* aRequest, + nsresult* aStatus) { + nsresult rv = aRequest->GetStatus(aStatus); + if (NS_FAILED(rv) || NS_FAILED(*aStatus)) { + return false; + } + + // This may still be an error page or somesuch + nsCOMPtr<nsIHttpChannel> httpChan(do_QueryInterface(aRequest)); + if (httpChan) { + bool success; + rv = httpChan->GetRequestSucceeded(&success); + if (NS_FAILED(rv) || !success) { + return false; + } + } + + // Otherwise, the request is successful + return true; +} + +static bool CanHandleURI(nsIURI* aURI) { + nsAutoCString scheme; + if (NS_FAILED(aURI->GetScheme(scheme))) { + return false; + } + + nsCOMPtr<nsIIOService> ios = mozilla::components::IO::Service(); + if (!ios) { + return false; + } + + nsCOMPtr<nsIProtocolHandler> handler; + ios->GetProtocolHandler(scheme.get(), getter_AddRefs(handler)); + if (!handler) { + return false; + } + + nsCOMPtr<nsIExternalProtocolHandler> extHandler = do_QueryInterface(handler); + // We can handle this URI if its protocol handler is not the external one + return extHandler == nullptr; +} + +// Helper for tedious URI equality syntax when one or both arguments may be +// null and URIEquals(null, null) should be true +static bool inline URIEquals(nsIURI* a, nsIURI* b) { + bool equal; + return (!a && !b) || (a && b && NS_SUCCEEDED(a->Equals(b, &equal)) && equal); +} + +/// +/// Member Functions +/// + +// Helper to spawn the frameloader. +void nsObjectLoadingContent::SetupFrameLoader() { + mFrameLoader = nsFrameLoader::Create(AsElement(), mNetworkCreated); + MOZ_ASSERT(mFrameLoader, "nsFrameLoader::Create failed"); +} + +// Helper to spawn the frameloader and return a pointer to its docshell. +already_AddRefed<nsIDocShell> nsObjectLoadingContent::SetupDocShell( + nsIURI* aRecursionCheckURI) { + SetupFrameLoader(); + if (!mFrameLoader) { + return nullptr; + } + + nsCOMPtr<nsIDocShell> docShell; + + if (aRecursionCheckURI) { + nsresult rv = mFrameLoader->CheckForRecursiveLoad(aRecursionCheckURI); + if (NS_SUCCEEDED(rv)) { + IgnoredErrorResult result; + docShell = mFrameLoader->GetDocShell(result); + if (result.Failed()) { + MOZ_ASSERT_UNREACHABLE("Could not get DocShell from mFrameLoader?"); + } + } else { + LOG(("OBJLC [%p]: Aborting recursive load", this)); + } + } + + if (!docShell) { + mFrameLoader->Destroy(); + mFrameLoader = nullptr; + return nullptr; + } + + MaybeStoreCrossOriginFeaturePolicy(); + + return docShell.forget(); +} + +void nsObjectLoadingContent::UnbindFromTree(bool aNullParent) { + // Reset state and clear pending events + /// XXX(johns): The implementation for GenericFrame notes that ideally we + /// would keep the docshell around, but trash the frameloader + UnloadObject(); +} + +nsObjectLoadingContent::nsObjectLoadingContent() + : mType(ObjectType::Loading), + mChannelLoaded(false), + mNetworkCreated(true), + mContentBlockingEnabled(false), + mIsStopping(false), + mIsLoading(false), + mScriptRequested(false), + mRewrittenYoutubeEmbed(false), + mLoadingSyntheticDocument(false) {} + +nsObjectLoadingContent::~nsObjectLoadingContent() { + // Should have been unbound from the tree at this point, and + // CheckPluginStopEvent keeps us alive + if (mFrameLoader) { + MOZ_ASSERT_UNREACHABLE( + "Should not be tearing down frame loaders at this point"); + mFrameLoader->Destroy(); + } +} + +// nsIRequestObserver +NS_IMETHODIMP +nsObjectLoadingContent::OnStartRequest(nsIRequest* aRequest) { + AUTO_PROFILER_LABEL("nsObjectLoadingContent::OnStartRequest", NETWORK); + + LOG(("OBJLC [%p]: Channel OnStartRequest", this)); + + if (aRequest != mChannel || !aRequest) { + // happens when a new load starts before the previous one got here + return NS_BINDING_ABORTED; + } + + nsCOMPtr<nsIChannel> chan(do_QueryInterface(aRequest)); + NS_ASSERTION(chan, "Why is our request not a channel?"); + + nsresult status = NS_OK; + bool success = IsSuccessfulRequest(aRequest, &status); + + // If we have already switched to type document, we're doing a + // process-switching DocumentChannel load. We should be able to pass down the + // load to our inner listener, but should also make sure to update our local + // state. + if (mType == ObjectType::Document) { + if (!mFinalListener) { + MOZ_ASSERT_UNREACHABLE( + "Already is Document, but don't have final listener yet?"); + return NS_BINDING_ABORTED; + } + + // If the load looks successful, fix up some of our local state before + // forwarding the request to the final URI loader. + // + // Forward load errors down to the document loader, so we don't tear down + // the nsDocShell ourselves. + if (success) { + LOG(("OBJLC [%p]: OnStartRequest: DocumentChannel request succeeded\n", + this)); + nsCString channelType; + MOZ_ALWAYS_SUCCEEDS(mChannel->GetContentType(channelType)); + + if (GetTypeOfContent(channelType) != ObjectType::Document) { + MOZ_CRASH("DocumentChannel request with non-document MIME"); + } + mContentType = channelType; + + MOZ_ALWAYS_SUCCEEDS( + NS_GetFinalChannelURI(mChannel, getter_AddRefs(mURI))); + } + + return mFinalListener->OnStartRequest(aRequest); + } + + // Otherwise we should be state loading, and call LoadObject with the channel + if (mType != ObjectType::Loading) { + MOZ_ASSERT_UNREACHABLE("Should be type loading at this point"); + return NS_BINDING_ABORTED; + } + NS_ASSERTION(!mChannelLoaded, "mChannelLoaded set already?"); + NS_ASSERTION(!mFinalListener, "mFinalListener exists already?"); + + mChannelLoaded = true; + + if (status == NS_ERROR_BLOCKED_URI) { + nsCOMPtr<nsIConsoleService> console( + do_GetService("@mozilla.org/consoleservice;1")); + if (console) { + nsCOMPtr<nsIURI> uri; + chan->GetURI(getter_AddRefs(uri)); + nsString message = + u"Blocking "_ns + + NS_ConvertASCIItoUTF16(uri->GetSpecOrDefault().get()) + + nsLiteralString( + u" since it was found on an internal Firefox blocklist."); + console->LogStringMessage(message.get()); + } + mContentBlockingEnabled = true; + return NS_ERROR_FAILURE; + } + + if (UrlClassifierFeatureFactory::IsClassifierBlockingErrorCode(status)) { + mContentBlockingEnabled = true; + return NS_ERROR_FAILURE; + } + + if (!success) { + LOG(("OBJLC [%p]: OnStartRequest: Request failed\n", this)); + // If the request fails, we still call LoadObject() to handle fallback + // content and notifying of failure. (mChannelLoaded && !mChannel) indicates + // the bad state. + mChannel = nullptr; + LoadObject(true, false); + return NS_ERROR_FAILURE; + } + + return LoadObject(true, false, aRequest); +} + +NS_IMETHODIMP +nsObjectLoadingContent::OnStopRequest(nsIRequest* aRequest, + nsresult aStatusCode) { + AUTO_PROFILER_LABEL("nsObjectLoadingContent::OnStopRequest", NETWORK); + + // Handle object not loading error because source was a tracking URL (or + // fingerprinting, cryptomining, etc.). + // We make a note of this object node by including it in a dedicated + // array of blocked tracking nodes under its parent document. + if (UrlClassifierFeatureFactory::IsClassifierBlockingErrorCode(aStatusCode)) { + nsCOMPtr<nsIContent> thisNode = + do_QueryInterface(static_cast<nsIObjectLoadingContent*>(this)); + if (thisNode && thisNode->IsInComposedDoc()) { + thisNode->GetComposedDoc()->AddBlockedNodeByClassifier(thisNode); + } + } + + if (aRequest != mChannel) { + return NS_BINDING_ABORTED; + } + + mChannel = nullptr; + + if (mFinalListener) { + // This may re-enter in the case of plugin listeners + nsCOMPtr<nsIStreamListener> listenerGrip(mFinalListener); + mFinalListener = nullptr; + listenerGrip->OnStopRequest(aRequest, aStatusCode); + } + + // Return value doesn't matter + return NS_OK; +} + +// nsIStreamListener +NS_IMETHODIMP +nsObjectLoadingContent::OnDataAvailable(nsIRequest* aRequest, + nsIInputStream* aInputStream, + uint64_t aOffset, uint32_t aCount) { + if (aRequest != mChannel) { + return NS_BINDING_ABORTED; + } + + if (mFinalListener) { + // This may re-enter in the case of plugin listeners + nsCOMPtr<nsIStreamListener> listenerGrip(mFinalListener); + return listenerGrip->OnDataAvailable(aRequest, aInputStream, aOffset, + aCount); + } + + // We shouldn't have a connected channel with no final listener + MOZ_ASSERT_UNREACHABLE( + "Got data for channel with no connected final " + "listener"); + mChannel = nullptr; + + return NS_ERROR_UNEXPECTED; +} + +NS_IMETHODIMP +nsObjectLoadingContent::GetActualType(nsACString& aType) { + aType = mContentType; + return NS_OK; +} + +NS_IMETHODIMP +nsObjectLoadingContent::GetDisplayedType(uint32_t* aType) { + *aType = DisplayedType(); + return NS_OK; +} + +// nsIInterfaceRequestor +// We use a shim class to implement this so that JS consumers still +// see an interface requestor even though WebIDL bindings don't expose +// that stuff. +class ObjectInterfaceRequestorShim final : public nsIInterfaceRequestor, + public nsIChannelEventSink, + public nsIStreamListener { + public: + NS_DECL_CYCLE_COLLECTING_ISUPPORTS + NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(ObjectInterfaceRequestorShim, + nsIInterfaceRequestor) + NS_DECL_NSIINTERFACEREQUESTOR + // RefPtr<nsObjectLoadingContent> fails due to ambiguous AddRef/Release, + // hence the ugly static cast :( + NS_FORWARD_NSICHANNELEVENTSINK( + static_cast<nsObjectLoadingContent*>(mContent.get())->) + NS_FORWARD_NSISTREAMLISTENER( + static_cast<nsObjectLoadingContent*>(mContent.get())->) + NS_FORWARD_NSIREQUESTOBSERVER( + static_cast<nsObjectLoadingContent*>(mContent.get())->) + + explicit ObjectInterfaceRequestorShim(nsIObjectLoadingContent* aContent) + : mContent(aContent) {} + + protected: + ~ObjectInterfaceRequestorShim() = default; + nsCOMPtr<nsIObjectLoadingContent> mContent; +}; + +NS_IMPL_CYCLE_COLLECTION(ObjectInterfaceRequestorShim, mContent) + +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ObjectInterfaceRequestorShim) + NS_INTERFACE_MAP_ENTRY(nsIInterfaceRequestor) + NS_INTERFACE_MAP_ENTRY(nsIChannelEventSink) + NS_INTERFACE_MAP_ENTRY(nsIStreamListener) + NS_INTERFACE_MAP_ENTRY(nsIRequestObserver) + NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIInterfaceRequestor) +NS_INTERFACE_MAP_END + +NS_IMPL_CYCLE_COLLECTING_ADDREF(ObjectInterfaceRequestorShim) +NS_IMPL_CYCLE_COLLECTING_RELEASE(ObjectInterfaceRequestorShim) + +NS_IMETHODIMP +ObjectInterfaceRequestorShim::GetInterface(const nsIID& aIID, void** aResult) { + if (aIID.Equals(NS_GET_IID(nsIChannelEventSink))) { + nsIChannelEventSink* sink = this; + *aResult = sink; + NS_ADDREF(sink); + return NS_OK; + } + if (aIID.Equals(NS_GET_IID(nsIObjectLoadingContent))) { + nsIObjectLoadingContent* olc = mContent; + *aResult = olc; + NS_ADDREF(olc); + return NS_OK; + } + return NS_NOINTERFACE; +} + +// nsIChannelEventSink +NS_IMETHODIMP +nsObjectLoadingContent::AsyncOnChannelRedirect( + nsIChannel* aOldChannel, nsIChannel* aNewChannel, uint32_t aFlags, + nsIAsyncVerifyRedirectCallback* cb) { + // If we're already busy with a new load, or have no load at all, + // cancel the redirect. + if (!mChannel || aOldChannel != mChannel) { + return NS_BINDING_ABORTED; + } + + mChannel = aNewChannel; + + if (mFinalListener) { + nsCOMPtr<nsIChannelEventSink> sink(do_QueryInterface(mFinalListener)); + MOZ_RELEASE_ASSERT(sink, "mFinalListener isn't nsIChannelEventSink?"); + if (mType != ObjectType::Document) { + MOZ_ASSERT_UNREACHABLE( + "Not a DocumentChannel load, but we're getting a " + "AsyncOnChannelRedirect with a mFinalListener?"); + return NS_BINDING_ABORTED; + } + + return sink->AsyncOnChannelRedirect(aOldChannel, aNewChannel, aFlags, cb); + } + + cb->OnRedirectVerifyCallback(NS_OK); + return NS_OK; +} + +void nsObjectLoadingContent::MaybeRewriteYoutubeEmbed(nsIURI* aURI, + nsIURI* aBaseURI, + nsIURI** aRewrittenURI) { + nsCOMPtr<nsIEffectiveTLDService> tldService = + do_GetService(NS_EFFECTIVETLDSERVICE_CONTRACTID); + // If we can't analyze the URL, just pass on through. + if (!tldService) { + NS_WARNING("Could not get TLD service!"); + return; + } + + nsAutoCString currentBaseDomain; + bool ok = NS_SUCCEEDED(tldService->GetBaseDomain(aURI, 0, currentBaseDomain)); + if (!ok) { + // Data URIs (commonly used for things like svg embeds) won't parse + // correctly, so just fail silently here. + return; + } + + // See if URL is referencing youtube + if (!currentBaseDomain.EqualsLiteral("youtube.com") && + !currentBaseDomain.EqualsLiteral("youtube-nocookie.com")) { + return; + } + + // We should only rewrite URLs with paths starting with "/v/", as we shouldn't + // touch object nodes with "/embed/" urls that already do that right thing. + nsAutoCString path; + aURI->GetPathQueryRef(path); + if (!StringBeginsWith(path, "/v/"_ns)) { + return; + } + + // See if requester is planning on using the JS API. + nsAutoCString uri; + nsresult rv = aURI->GetSpec(uri); + if (NS_FAILED(rv)) { + return; + } + + // Some YouTube urls have parameters in path components, e.g. + // http://youtube.com/embed/7LcUOEP7Brc&start=35. These URLs work with flash, + // but break iframe/object embedding. If this situation occurs with rewritten + // URLs, convert the parameters to query in order to make the video load + // correctly as an iframe. In either case, warn about it in the + // developer console. + int32_t ampIndex = uri.FindChar('&', 0); + bool replaceQuery = false; + if (ampIndex != -1) { + int32_t qmIndex = uri.FindChar('?', 0); + if (qmIndex == -1 || qmIndex > ampIndex) { + replaceQuery = true; + } + } + + Document* doc = AsElement()->OwnerDoc(); + // If we've made it this far, we've got a rewritable embed. Log it in + // telemetry. + doc->SetUseCounter(eUseCounter_custom_YouTubeFlashEmbed); + + // If we're pref'd off, return after telemetry has been logged. + if (!Preferences::GetBool(kPrefYoutubeRewrite)) { + return; + } + + nsAutoString utf16OldURI = NS_ConvertUTF8toUTF16(uri); + // If we need to convert the URL, it means an ampersand comes first. + // Use the index we found earlier. + if (replaceQuery) { + // Replace question marks with ampersands. + uri.ReplaceChar('?', '&'); + // Replace the first ampersand with a question mark. + uri.SetCharAt('?', ampIndex); + } + // Switch out video access url formats, which should possibly allow HTML5 + // video loading. + uri.ReplaceSubstring("/v/"_ns, "/embed/"_ns); + nsAutoString utf16URI = NS_ConvertUTF8toUTF16(uri); + rv = nsContentUtils::NewURIWithDocumentCharset(aRewrittenURI, utf16URI, doc, + aBaseURI); + if (NS_FAILED(rv)) { + return; + } + AutoTArray<nsString, 2> params = {utf16OldURI, utf16URI}; + const char* msgName; + // If there's no query to rewrite, just notify in the developer console + // that we're changing the embed. + if (!replaceQuery) { + msgName = "RewriteYouTubeEmbed"; + } else { + msgName = "RewriteYouTubeEmbedPathParams"; + } + nsContentUtils::ReportToConsole(nsIScriptError::warningFlag, "Plugins"_ns, + doc, nsContentUtils::eDOM_PROPERTIES, msgName, + params); +} + +bool nsObjectLoadingContent::CheckLoadPolicy(int16_t* aContentPolicy) { + if (!aContentPolicy || !mURI) { + MOZ_ASSERT_UNREACHABLE("Doing it wrong"); + return false; + } + + Element* el = AsElement(); + Document* doc = el->OwnerDoc(); + + nsContentPolicyType contentPolicyType = GetContentPolicyType(); + + nsCOMPtr<nsILoadInfo> secCheckLoadInfo = + new LoadInfo(doc->NodePrincipal(), // loading principal + doc->NodePrincipal(), // triggering principal + el, nsILoadInfo::SEC_ONLY_FOR_EXPLICIT_CONTENTSEC_CHECK, + contentPolicyType); + + *aContentPolicy = nsIContentPolicy::ACCEPT; + nsresult rv = + NS_CheckContentLoadPolicy(mURI, secCheckLoadInfo, aContentPolicy, + nsContentUtils::GetContentPolicy()); + NS_ENSURE_SUCCESS(rv, false); + if (NS_CP_REJECTED(*aContentPolicy)) { + LOG(("OBJLC [%p]: Content policy denied load of %s", this, + mURI->GetSpecOrDefault().get())); + return false; + } + + return true; +} + +bool nsObjectLoadingContent::CheckProcessPolicy(int16_t* aContentPolicy) { + if (!aContentPolicy) { + MOZ_ASSERT_UNREACHABLE("Null out variable"); + return false; + } + + Element* el = AsElement(); + Document* doc = el->OwnerDoc(); + + nsContentPolicyType objectType; + switch (mType) { + case ObjectType::Document: + objectType = nsIContentPolicy::TYPE_DOCUMENT; + break; + default: + MOZ_ASSERT_UNREACHABLE( + "Calling checkProcessPolicy with an unexpected type"); + return false; + } + + nsCOMPtr<nsILoadInfo> secCheckLoadInfo = new LoadInfo( + doc->NodePrincipal(), // loading principal + doc->NodePrincipal(), // triggering principal + el, nsILoadInfo::SEC_ONLY_FOR_EXPLICIT_CONTENTSEC_CHECK, objectType); + + *aContentPolicy = nsIContentPolicy::ACCEPT; + nsresult rv = NS_CheckContentProcessPolicy( + mURI ? mURI : mBaseURI, secCheckLoadInfo, aContentPolicy, + nsContentUtils::GetContentPolicy()); + NS_ENSURE_SUCCESS(rv, false); + + if (NS_CP_REJECTED(*aContentPolicy)) { + LOG(("OBJLC [%p]: CheckContentProcessPolicy rejected load", this)); + return false; + } + + return true; +} + +nsObjectLoadingContent::ParameterUpdateFlags +nsObjectLoadingContent::UpdateObjectParameters() { + Element* el = AsElement(); + + uint32_t caps = GetCapabilities(); + LOG(("OBJLC [%p]: Updating object parameters", this)); + + nsresult rv; + nsAutoCString newMime; + nsAutoString typeAttr; + nsCOMPtr<nsIURI> newURI; + nsCOMPtr<nsIURI> newBaseURI; + ObjectType newType; + // Set if this state can't be used to load anything, forces + // ObjectType::Fallback + bool stateInvalid = false; + // Indicates what parameters changed. + // eParamChannelChanged - means parameters that affect channel opening + // decisions changed + // eParamStateChanged - means anything that affects what content we load + // changed, even if the channel we'd open remains the + // same. + // + // State changes outside of the channel parameters only matter if we've + // already opened a channel or tried to instantiate content, whereas channel + // parameter changes require re-opening the channel even if we haven't gotten + // that far. + nsObjectLoadingContent::ParameterUpdateFlags retval = eParamNoChange; + + /// + /// Initial MIME Type + /// + + if (caps & eFallbackIfClassIDPresent && + el->HasNonEmptyAttr(nsGkAtoms::classid)) { + // We don't support class ID plugin references, so we should always treat + // having class Ids as attributes as invalid, and fallback accordingly. + newMime.Truncate(); + stateInvalid = true; + } + + /// + /// Codebase + /// + + nsAutoString codebaseStr; + nsIURI* docBaseURI = el->GetBaseURI(); + el->GetAttr(nsGkAtoms::codebase, codebaseStr); + + if (!codebaseStr.IsEmpty()) { + rv = nsContentUtils::NewURIWithDocumentCharset( + getter_AddRefs(newBaseURI), codebaseStr, el->OwnerDoc(), docBaseURI); + if (NS_FAILED(rv)) { + // Malformed URI + LOG( + ("OBJLC [%p]: Could not parse plugin's codebase as a URI, " + "will use document baseURI instead", + this)); + } + } + + // If we failed to build a valid URI, use the document's base URI + if (!newBaseURI) { + newBaseURI = docBaseURI; + } + + nsAutoString rawTypeAttr; + el->GetAttr(nsGkAtoms::type, rawTypeAttr); + if (!rawTypeAttr.IsEmpty()) { + typeAttr = rawTypeAttr; + nsAutoString params; + nsAutoString mime; + nsContentUtils::SplitMimeType(rawTypeAttr, mime, params); + CopyUTF16toUTF8(mime, newMime); + } + + /// + /// URI + /// + + nsAutoString uriStr; + // Different elements keep this in various locations + if (el->NodeInfo()->Equals(nsGkAtoms::object)) { + el->GetAttr(nsGkAtoms::data, uriStr); + } else if (el->NodeInfo()->Equals(nsGkAtoms::embed)) { + el->GetAttr(nsGkAtoms::src, uriStr); + } else { + MOZ_ASSERT_UNREACHABLE("Unrecognized plugin-loading tag"); + } + + mRewrittenYoutubeEmbed = false; + // Note that the baseURI changing could affect the newURI, even if uriStr did + // not change. + if (!uriStr.IsEmpty()) { + rv = nsContentUtils::NewURIWithDocumentCharset( + getter_AddRefs(newURI), uriStr, el->OwnerDoc(), newBaseURI); + nsCOMPtr<nsIURI> rewrittenURI; + MaybeRewriteYoutubeEmbed(newURI, newBaseURI, getter_AddRefs(rewrittenURI)); + if (rewrittenURI) { + newURI = rewrittenURI; + mRewrittenYoutubeEmbed = true; + newMime = "text/html"_ns; + } + + if (NS_FAILED(rv)) { + stateInvalid = true; + } + } + + /// + /// Check if the original (pre-channel) content-type or URI changed, and + /// record mOriginal{ContentType,URI} + /// + + if ((mOriginalContentType != newMime) || !URIEquals(mOriginalURI, newURI)) { + // These parameters changing requires re-opening the channel, so don't + // consider the currently-open channel below + // XXX(johns): Changing the mime type might change our decision on whether + // or not we load a channel, so we count changes to it as a + // channel parameter change for the sake of simplicity. + retval = (ParameterUpdateFlags)(retval | eParamChannelChanged); + LOG(("OBJLC [%p]: Channel parameters changed", this)); + } + mOriginalContentType = newMime; + mOriginalURI = newURI; + + /// + /// If we have a channel, see if its MIME type should take precendence and + /// check the final (redirected) URL + /// + + // If we have a loaded channel and channel parameters did not change, use it + // to determine what we would load. + bool useChannel = mChannelLoaded && !(retval & eParamChannelChanged); + // If we have a channel and are type loading, as opposed to having an existing + // channel for a previous load. + bool newChannel = useChannel && mType == ObjectType::Loading; + + RefPtr<DocumentChannel> documentChannel = do_QueryObject(mChannel); + if (newChannel && documentChannel) { + // If we've got a DocumentChannel which is marked as loaded using + // `mChannelLoaded`, we are currently in the middle of a + // `UpgradeLoadToDocument`. + // + // As we don't have the real mime-type from the channel, handle this by + // using `newMime`. + newMime = TEXT_HTML; + + MOZ_DIAGNOSTIC_ASSERT(GetTypeOfContent(newMime) == ObjectType::Document, + "How is text/html not ObjectType::Document?"); + } else if (newChannel && mChannel) { + nsCString channelType; + rv = mChannel->GetContentType(channelType); + if (NS_FAILED(rv)) { + MOZ_ASSERT_UNREACHABLE("GetContentType failed"); + stateInvalid = true; + channelType.Truncate(); + } + + LOG(("OBJLC [%p]: Channel has a content type of %s", this, + channelType.get())); + + bool binaryChannelType = false; + if (channelType.EqualsASCII(APPLICATION_GUESS_FROM_EXT)) { + channelType = APPLICATION_OCTET_STREAM; + mChannel->SetContentType(channelType); + binaryChannelType = true; + } else if (channelType.EqualsASCII(APPLICATION_OCTET_STREAM) || + channelType.EqualsASCII(BINARY_OCTET_STREAM)) { + binaryChannelType = true; + } + + // Channel can change our URI through redirection + rv = NS_GetFinalChannelURI(mChannel, getter_AddRefs(newURI)); + if (NS_FAILED(rv)) { + MOZ_ASSERT_UNREACHABLE("NS_GetFinalChannelURI failure"); + stateInvalid = true; + } + + ObjectType typeHint = + newMime.IsEmpty() ? ObjectType::Fallback : GetTypeOfContent(newMime); + + // In order of preference: + // + // 1) Use our type hint if it matches a plugin + // 2) If we have eAllowPluginSkipChannel, use the uri file extension if + // it matches a plugin + // 3) If the channel returns a binary stream type: + // 3a) If we have a type non-null non-document type hint, use that + // 3b) If the uri file extension matches a plugin type, use that + // 4) Use the channel type + + bool overrideChannelType = false; + if (IsPluginMIME(newMime)) { + LOG(("OBJLC [%p]: Using plugin type hint in favor of any channel type", + this)); + overrideChannelType = true; + } else if (binaryChannelType && typeHint != ObjectType::Fallback) { + if (typeHint == ObjectType::Document) { + if (imgLoader::SupportImageWithMimeType(newMime)) { + LOG( + ("OBJLC [%p]: Using type hint in favor of binary channel type " + "(Image Document)", + this)); + overrideChannelType = true; + } + } else { + LOG( + ("OBJLC [%p]: Using type hint in favor of binary channel type " + "(Non-Image Document)", + this)); + overrideChannelType = true; + } + } + + if (overrideChannelType) { + // Set the type we'll use for dispatch on the channel. Otherwise we could + // end up trying to dispatch to a nsFrameLoader, which will complain that + // it couldn't find a way to handle application/octet-stream + nsAutoCString parsedMime, dummy; + NS_ParseResponseContentType(newMime, parsedMime, dummy); + if (!parsedMime.IsEmpty()) { + mChannel->SetContentType(parsedMime); + } + } else { + newMime = channelType; + } + } else if (newChannel) { + LOG(("OBJLC [%p]: We failed to open a channel, marking invalid", this)); + stateInvalid = true; + } + + /// + /// Determine final type + /// + // In order of preference: + // 1) If we have attempted channel load, or set stateInvalid above, the type + // is always null (fallback) + // 2) If we have a loaded channel, we grabbed its mimeType above, use that + // type. + // 3) If we have a plugin type and no URI, use that type. + // 4) If we have a plugin type and eAllowPluginSkipChannel, use that type. + // 5) if we have a URI, set type to loading to indicate we'd need a channel + // to proceed. + // 6) Otherwise, type null to indicate unloadable content (fallback) + // + + ObjectType newMime_Type = GetTypeOfContent(newMime); + + if (stateInvalid) { + newType = ObjectType::Fallback; + LOG(("OBJLC [%p]: NewType #0: %s - %u", this, newMime.get(), + uint32_t(newType))); + newMime.Truncate(); + } else if (newChannel) { + // If newChannel is set above, we considered it in setting newMime + newType = newMime_Type; + LOG(("OBJLC [%p]: NewType #1: %s - %u", this, newMime.get(), + uint32_t(newType))); + LOG(("OBJLC [%p]: Using channel type", this)); + } else if (((caps & eAllowPluginSkipChannel) || !newURI) && + IsPluginMIME(newMime)) { + newType = newMime_Type; + LOG(("OBJLC [%p]: NewType #2: %s - %u", this, newMime.get(), + uint32_t(newType))); + LOG(("OBJLC [%p]: Plugin type with no URI, skipping channel load", this)); + } else if (newURI && (mOriginalContentType.IsEmpty() || + newMime_Type != ObjectType::Fallback)) { + // We could potentially load this if we opened a channel on mURI, indicate + // this by leaving type as loading. + // + // If a MIME type was requested in the tag, but we have decided to set load + // type to null, ignore (otherwise we'll default to document type loading). + newType = ObjectType::Loading; + LOG(("OBJLC [%p]: NewType #3: %u", this, uint32_t(newType))); + } else { + // Unloadable - no URI, and no plugin/MIME type. Non-plugin types (images, + // documents) always load with a channel. + newType = ObjectType::Fallback; + LOG(("OBJLC [%p]: NewType #4: %u", this, uint32_t(newType))); + } + + mLoadingSyntheticDocument = newType == ObjectType::Document && + imgLoader::SupportImageWithMimeType(newMime); + + /// + /// Handle existing channels + /// + + if (useChannel && newType == ObjectType::Loading) { + // We decided to use a channel, and also that the previous channel is still + // usable, so re-use the existing values. + newType = mType; + LOG(("OBJLC [%p]: NewType #5: %u", this, uint32_t(newType))); + newMime = mContentType; + newURI = mURI; + } else if (useChannel && !newChannel) { + // We have an existing channel, but did not decide to use one. + retval = (ParameterUpdateFlags)(retval | eParamChannelChanged); + useChannel = false; + } + + /// + /// Update changed values + /// + + if (newType != mType) { + retval = (ParameterUpdateFlags)(retval | eParamStateChanged); + LOG(("OBJLC [%p]: Type changed from %u -> %u", this, uint32_t(mType), + uint32_t(newType))); + mType = newType; + } + + if (!URIEquals(mBaseURI, newBaseURI)) { + LOG(("OBJLC [%p]: Object effective baseURI changed", this)); + mBaseURI = newBaseURI; + } + + if (!URIEquals(newURI, mURI)) { + retval = (ParameterUpdateFlags)(retval | eParamStateChanged); + LOG(("OBJLC [%p]: Object effective URI changed", this)); + mURI = newURI; + } + + // We don't update content type when loading, as the type is not final and we + // don't want to superfluously change between mOriginalContentType -> + // mContentType when doing |obj.data = obj.data| with a channel and differing + // type. + if (mType != ObjectType::Loading && mContentType != newMime) { + retval = (ParameterUpdateFlags)(retval | eParamStateChanged); + retval = (ParameterUpdateFlags)(retval | eParamContentTypeChanged); + LOG(("OBJLC [%p]: Object effective mime type changed (%s -> %s)", this, + mContentType.get(), newMime.get())); + mContentType = newMime; + } + + // If we decided to keep using info from an old channel, but also that state + // changed, we need to invalidate it. + if (useChannel && !newChannel && (retval & eParamStateChanged)) { + mType = ObjectType::Loading; + retval = (ParameterUpdateFlags)(retval | eParamChannelChanged); + } + + return retval; +} + +// Only OnStartRequest should be passing the channel parameter +nsresult nsObjectLoadingContent::LoadObject(bool aNotify, bool aForceLoad) { + return LoadObject(aNotify, aForceLoad, nullptr); +} + +nsresult nsObjectLoadingContent::LoadObject(bool aNotify, bool aForceLoad, + nsIRequest* aLoadingChannel) { + Element* el = AsElement(); + Document* doc = el->OwnerDoc(); + nsresult rv = NS_OK; + + // Per bug 1318303, if the parent document is not active, load the alternative + // and return. + if (!doc->IsCurrentActiveDocument()) { + // Since this can be triggered on change of attributes, make sure we've + // unloaded whatever is loaded first. + UnloadObject(); + ObjectType oldType = mType; + mType = ObjectType::Fallback; + TriggerInnerFallbackLoads(); + NotifyStateChanged(oldType, true); + return NS_OK; + } + + // XXX(johns): In these cases, we refuse to touch our content and just + // remain unloaded, as per legacy behavior. It would make more sense to + // load fallback content initially and refuse to ever change state again. + if (doc->IsBeingUsedAsImage()) { + return NS_OK; + } + + if (doc->IsLoadedAsData() || doc->IsStaticDocument()) { + return NS_OK; + } + + LOG(("OBJLC [%p]: LoadObject called, notify %u, forceload %u, channel %p", + this, aNotify, aForceLoad, aLoadingChannel)); + + // We can't re-use an already open channel, but aForceLoad may make us try + // to load a plugin without any changes in channel state. + if (aForceLoad && mChannelLoaded) { + CloseChannel(); + mChannelLoaded = false; + } + + // Save these for NotifyStateChanged(); + ObjectType oldType = mType; + + ParameterUpdateFlags stateChange = UpdateObjectParameters(); + + if (!stateChange && !aForceLoad) { + return NS_OK; + } + + /// + /// State has changed, unload existing content and attempt to load new type + /// + LOG(("OBJLC [%p]: LoadObject - plugin state changed (%u)", this, + stateChange)); + + // We synchronously start/stop plugin instances below, which may spin the + // event loop. Re-entering into the load is fine, but at that point the + // original load call needs to abort when unwinding + // NOTE this is located *after* the state change check, a subsequent load + // with no subsequently changed state will be a no-op. + if (mIsLoading) { + LOG(("OBJLC [%p]: Re-entering into LoadObject", this)); + } + mIsLoading = true; + AutoSetLoadingToFalse reentryCheck(this); + + // Unload existing content, keeping in mind stopping plugins might spin the + // event loop. Note that we check for still-open channels below + UnloadObject(false); // Don't reset state + if (!mIsLoading) { + // The event loop must've spun and re-entered into LoadObject, which + // finished the load + LOG(("OBJLC [%p]: Re-entered into LoadObject, aborting outer load", this)); + return NS_OK; + } + + // Determine what's going on with our channel. + if (stateChange & eParamChannelChanged) { + // If the channel params changed, throw away the channel, but unset + // mChannelLoaded so we'll still try to open a new one for this load if + // necessary + CloseChannel(); + mChannelLoaded = false; + } else if (mType == ObjectType::Fallback && mChannel) { + // If we opened a channel but then failed to find a loadable state, throw it + // away. mChannelLoaded will indicate that we tried to load a channel at one + // point so we wont recurse + CloseChannel(); + } else if (mType == ObjectType::Loading && mChannel) { + // We're still waiting on a channel load, already opened one, and + // channel parameters didn't change + return NS_OK; + } else if (mChannelLoaded && mChannel != aLoadingChannel) { + // The only time we should have a loaded channel with a changed state is + // when the channel has just opened -- in which case this call should + // have originated from OnStartRequest + MOZ_ASSERT_UNREACHABLE( + "Loading with a channel, but state doesn't make sense"); + return NS_OK; + } + + // + // Security checks + // + + if (mType != ObjectType::Fallback) { + bool allowLoad = true; + int16_t contentPolicy = nsIContentPolicy::ACCEPT; + // If mChannelLoaded is set we presumably already passed load policy + // If mType == ObjectType::Loading then we call OpenChannel() which + // internally creates a new channel and calls asyncOpen() on that channel + // which then enforces content policy checks. + if (allowLoad && mURI && !mChannelLoaded && mType != ObjectType::Loading) { + allowLoad = CheckLoadPolicy(&contentPolicy); + } + // If we're loading a type now, check ProcessPolicy. Note that we may check + // both now in the case of plugins whose type is determined before opening a + // channel. + if (allowLoad && mType != ObjectType::Loading) { + allowLoad = CheckProcessPolicy(&contentPolicy); + } + + // Content policy implementations can mutate the DOM, check for re-entry + if (!mIsLoading) { + LOG(("OBJLC [%p]: We re-entered in content policy, leaving original load", + this)); + return NS_OK; + } + + // Load denied, switch to null + if (!allowLoad) { + LOG(("OBJLC [%p]: Load denied by policy", this)); + mType = ObjectType::Fallback; + } + } + + // Don't allow view-source scheme. + // view-source is the only scheme to which this applies at the moment due to + // potential timing attacks to read data from cross-origin documents. If this + // widens we should add a protocol flag for whether the scheme is only allowed + // in top and use something like nsNetUtil::NS_URIChainHasFlags. + if (mType != ObjectType::Fallback) { + nsCOMPtr<nsIURI> tempURI = mURI; + nsCOMPtr<nsINestedURI> nestedURI = do_QueryInterface(tempURI); + while (nestedURI) { + // view-source should always be an nsINestedURI, loop and check the + // scheme on this and all inner URIs that are also nested URIs. + if (tempURI->SchemeIs("view-source")) { + LOG(("OBJLC [%p]: Blocking as effective URI has view-source scheme", + this)); + mType = ObjectType::Fallback; + break; + } + + nestedURI->GetInnerURI(getter_AddRefs(tempURI)); + nestedURI = do_QueryInterface(tempURI); + } + } + + // Items resolved as Image/Document are not candidates for content blocking, + // as well as invalid plugins (they will not have the mContentType set). + if (mType == ObjectType::Fallback && ShouldBlockContent()) { + LOG(("OBJLC [%p]: Enable content blocking", this)); + mType = ObjectType::Loading; + } + + // Sanity check: We shouldn't have any loaded resources, pending events, or + // a final listener at this point + if (mFrameLoader || mFinalListener) { + MOZ_ASSERT_UNREACHABLE("Trying to load new plugin with existing content"); + return NS_OK; + } + + // More sanity-checking: + // If mChannel is set, mChannelLoaded should be set, and vice-versa + if (mType != ObjectType::Fallback && !!mChannel != mChannelLoaded) { + MOZ_ASSERT_UNREACHABLE("Trying to load with bad channel state"); + return NS_OK; + } + + /// + /// Attempt to load new type + /// + + // We don't set mFinalListener until OnStartRequest has been called, to + // prevent re-entry ugliness with CloseChannel() + nsCOMPtr<nsIStreamListener> finalListener; + switch (mType) { + case ObjectType::Document: { + if (!mChannel) { + // We could mFrameLoader->LoadURI(mURI), but UpdateObjectParameters + // requires documents have a channel, so this is not a valid state. + MOZ_ASSERT_UNREACHABLE( + "Attempting to load a document without a " + "channel"); + rv = NS_ERROR_FAILURE; + break; + } + + nsCOMPtr<nsIDocShell> docShell = SetupDocShell(mURI); + if (!docShell) { + rv = NS_ERROR_FAILURE; + break; + } + + // We're loading a document, so we have to set LOAD_DOCUMENT_URI + // (especially important for firing onload) + nsLoadFlags flags = 0; + mChannel->GetLoadFlags(&flags); + flags |= nsIChannel::LOAD_DOCUMENT_URI; + mChannel->SetLoadFlags(flags); + + nsCOMPtr<nsIInterfaceRequestor> req(do_QueryInterface(docShell)); + NS_ASSERTION(req, "Docshell must be an ifreq"); + + nsCOMPtr<nsIURILoader> uriLoader(components::URILoader::Service()); + if (NS_WARN_IF(!uriLoader)) { + MOZ_ASSERT_UNREACHABLE("Failed to get uriLoader service"); + mFrameLoader->Destroy(); + mFrameLoader = nullptr; + break; + } + + rv = uriLoader->OpenChannel(mChannel, nsIURILoader::DONT_RETARGET, req, + getter_AddRefs(finalListener)); + // finalListener will receive OnStartRequest either below, or if + // `mChannel` is a `DocumentChannel`, it will be received after + // RedirectToRealChannel. + } break; + case ObjectType::Loading: + // If our type remains Loading, we need a channel to proceed + rv = OpenChannel(); + if (NS_FAILED(rv)) { + LOG(("OBJLC [%p]: OpenChannel returned failure (%" PRIu32 ")", this, + static_cast<uint32_t>(rv))); + } + break; + case ObjectType::Fallback: + // Handled below, silence compiler warnings + break; + } + + // + // Loaded, handle notifications and fallback + // + if (NS_FAILED(rv)) { + // If we failed in the loading hunk above, switch to null (empty) region + LOG(("OBJLC [%p]: Loading failed, switching to fallback", this)); + mType = ObjectType::Fallback; + } + + if (mType == ObjectType::Fallback) { + LOG(("OBJLC [%p]: Switching to fallback state", this)); + MOZ_ASSERT(!mFrameLoader, "switched to fallback but also loaded something"); + + MaybeFireErrorEvent(); + + if (mChannel) { + // If we were loading with a channel but then failed over, throw it away + CloseChannel(); + } + + // Don't try to initialize plugins or final listener below + finalListener = nullptr; + + TriggerInnerFallbackLoads(); + } + + // Notify of our final state + NotifyStateChanged(oldType, aNotify); + NS_ENSURE_TRUE(mIsLoading, NS_OK); + + // + // Spawning plugins and dispatching to the final listener may re-enter, so are + // delayed until after we fire a notification, to prevent missing + // notifications or firing them out of order. + // + // Note that we ensured that we entered into LoadObject() from + // ::OnStartRequest above when loading with a channel. + // + + rv = NS_OK; + if (finalListener) { + NS_ASSERTION(mType != ObjectType::Fallback && mType != ObjectType::Loading, + "We should not have a final listener with a non-loaded type"); + mFinalListener = finalListener; + + // If we're a DocumentChannel load, hold off on firing the `OnStartRequest` + // callback, as we haven't received it yet from our caller. + RefPtr<DocumentChannel> documentChannel = do_QueryObject(mChannel); + if (documentChannel) { + MOZ_ASSERT( + mType == ObjectType::Document, + "We have a DocumentChannel here but aren't loading a document?"); + } else { + rv = finalListener->OnStartRequest(mChannel); + } + } + + if ((NS_FAILED(rv) && rv != NS_ERROR_PARSED_DATA_CACHED) && mIsLoading) { + // Since we've already notified of our transition, we can just Unload and + // call ConfigureFallback (which will notify again) + oldType = mType; + mType = ObjectType::Fallback; + UnloadObject(false); + NS_ENSURE_TRUE(mIsLoading, NS_OK); + CloseChannel(); + TriggerInnerFallbackLoads(); + NotifyStateChanged(oldType, true); + } + + return NS_OK; +} + +// This call can re-enter when dealing with plugin listeners +nsresult nsObjectLoadingContent::CloseChannel() { + if (mChannel) { + LOG(("OBJLC [%p]: Closing channel\n", this)); + // Null the values before potentially-reentering, and ensure they survive + // the call + nsCOMPtr<nsIChannel> channelGrip(mChannel); + nsCOMPtr<nsIStreamListener> listenerGrip(mFinalListener); + mChannel = nullptr; + mFinalListener = nullptr; + channelGrip->CancelWithReason(NS_BINDING_ABORTED, + "nsObjectLoadingContent::CloseChannel"_ns); + if (listenerGrip) { + // mFinalListener is only set by LoadObject after OnStartRequest, or + // by OnStartRequest in the case of late-opened plugin streams + listenerGrip->OnStopRequest(channelGrip, NS_BINDING_ABORTED); + } + } + return NS_OK; +} + +bool nsObjectLoadingContent::IsAboutBlankLoadOntoInitialAboutBlank( + nsIURI* aURI, bool aInheritPrincipal, nsIPrincipal* aPrincipalToInherit) { + return NS_IsAboutBlank(aURI) && aInheritPrincipal && + (!mFrameLoader || !mFrameLoader->GetExistingDocShell() || + mFrameLoader->GetExistingDocShell() + ->IsAboutBlankLoadOntoInitialAboutBlank(aURI, aInheritPrincipal, + aPrincipalToInherit)); +} + +nsresult nsObjectLoadingContent::OpenChannel() { + Element* el = AsElement(); + Document* doc = el->OwnerDoc(); + NS_ASSERTION(doc, "No owner document?"); + + nsresult rv; + mChannel = nullptr; + + // E.g. mms:// + if (!mURI || !CanHandleURI(mURI)) { + return NS_ERROR_NOT_AVAILABLE; + } + + nsCOMPtr<nsILoadGroup> group = doc->GetDocumentLoadGroup(); + nsCOMPtr<nsIChannel> chan; + RefPtr<ObjectInterfaceRequestorShim> shim = + new ObjectInterfaceRequestorShim(this); + + bool inheritAttrs = nsContentUtils::ChannelShouldInheritPrincipal( + el->NodePrincipal(), // aLoadState->PrincipalToInherit() + mURI, // aLoadState->URI() + true, // aInheritForAboutBlank + false); // aForceInherit + + bool inheritPrincipal = inheritAttrs && !SchemeIsData(mURI); + + nsSecurityFlags securityFlags = + nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_SEC_CONTEXT_IS_NULL; + if (inheritPrincipal) { + securityFlags |= nsILoadInfo::SEC_FORCE_INHERIT_PRINCIPAL; + } + + nsContentPolicyType contentPolicyType = GetContentPolicyType(); + // The setting of LOAD_BYPASS_SERVICE_WORKER here is now an optimization. + // ServiceWorkerInterceptController::ShouldPrepareForIntercept does a more + // expensive check of BrowsingContext ancestors to look for object/embed. + nsLoadFlags loadFlags = nsIChannel::LOAD_CALL_CONTENT_SNIFFERS | + nsIChannel::LOAD_BYPASS_SERVICE_WORKER | + nsIRequest::LOAD_HTML_OBJECT_DATA; + uint32_t sandboxFlags = doc->GetSandboxFlags(); + + // For object loads we store the CSP that potentially needs to + // be inherited, e.g. in case we are loading an opaque origin + // like a data: URI. The actual inheritance check happens within + // Document::InitCSP(). Please create an actual copy of the CSP + // (do not share the same reference) otherwise a Meta CSP of an + // opaque origin will incorrectly be propagated to the embedding + // document. + RefPtr<nsCSPContext> cspToInherit; + if (nsCOMPtr<nsIContentSecurityPolicy> csp = doc->GetCsp()) { + cspToInherit = new nsCSPContext(); + cspToInherit->InitFromOther(static_cast<nsCSPContext*>(csp.get())); + } + + // --- Create LoadInfo + RefPtr<LoadInfo> loadInfo = new LoadInfo( + /*aLoadingPrincipal = aLoadingContext->NodePrincipal() */ nullptr, + /*aTriggeringPrincipal = aLoadingPrincipal */ nullptr, + /*aLoadingContext = */ el, + /*aSecurityFlags = */ securityFlags, + /*aContentPolicyType = */ contentPolicyType, + /*aLoadingClientInfo = */ Nothing(), + /*aController = */ Nothing(), + /*aSandboxFlags = */ sandboxFlags); + + if (inheritAttrs) { + loadInfo->SetPrincipalToInherit(el->NodePrincipal()); + } + + if (cspToInherit) { + loadInfo->SetCSPToInherit(cspToInherit); + } + + if (DocumentChannel::CanUseDocumentChannel(mURI) && + !IsAboutBlankLoadOntoInitialAboutBlank(mURI, inheritPrincipal, + el->NodePrincipal())) { + // --- Create LoadState + RefPtr<nsDocShellLoadState> loadState = new nsDocShellLoadState(mURI); + loadState->SetPrincipalToInherit(el->NodePrincipal()); + loadState->SetTriggeringPrincipal(loadInfo->TriggeringPrincipal()); + if (cspToInherit) { + loadState->SetCsp(cspToInherit); + } + loadState->SetTriggeringSandboxFlags(sandboxFlags); + + // TODO(djg): This was httpChan->SetReferrerInfoWithoutClone(referrerInfo); + // Is the ...WithoutClone(...) important? + auto referrerInfo = MakeRefPtr<ReferrerInfo>(*doc); + loadState->SetReferrerInfo(referrerInfo); + + chan = + DocumentChannel::CreateForObject(loadState, loadInfo, loadFlags, shim); + MOZ_ASSERT(chan); + // NS_NewChannel sets the group on the channel. CreateDocumentChannel does + // not. + chan->SetLoadGroup(group); + } else { + rv = NS_NewChannelInternal(getter_AddRefs(chan), // outChannel + mURI, // aUri + loadInfo, // aLoadInfo + nullptr, // aPerformanceStorage + group, // aLoadGroup + shim, // aCallbacks + loadFlags, // aLoadFlags + nullptr); // aIoService + NS_ENSURE_SUCCESS(rv, rv); + + if (inheritAttrs) { + nsCOMPtr<nsILoadInfo> loadinfo = chan->LoadInfo(); + loadinfo->SetPrincipalToInherit(el->NodePrincipal()); + } + + // For object loads we store the CSP that potentially needs to + // be inherited, e.g. in case we are loading an opaque origin + // like a data: URI. The actual inheritance check happens within + // Document::InitCSP(). Please create an actual copy of the CSP + // (do not share the same reference) otherwise a Meta CSP of an + // opaque origin will incorrectly be propagated to the embedding + // document. + if (cspToInherit) { + nsCOMPtr<nsILoadInfo> loadinfo = chan->LoadInfo(); + static_cast<LoadInfo*>(loadinfo.get())->SetCSPToInherit(cspToInherit); + } + }; + + // Referrer + nsCOMPtr<nsIHttpChannel> httpChan(do_QueryInterface(chan)); + if (httpChan) { + auto referrerInfo = MakeRefPtr<ReferrerInfo>(*doc); + + rv = httpChan->SetReferrerInfoWithoutClone(referrerInfo); + MOZ_ASSERT(NS_SUCCEEDED(rv)); + + // Set the initiator type + nsCOMPtr<nsITimedChannel> timedChannel(do_QueryInterface(httpChan)); + if (timedChannel) { + timedChannel->SetInitiatorType(el->LocalName()); + } + + nsCOMPtr<nsIClassOfService> cos(do_QueryInterface(httpChan)); + if (cos && UserActivation::IsHandlingUserInput()) { + cos->AddClassFlags(nsIClassOfService::UrgentStart); + } + } + + nsCOMPtr<nsIScriptChannel> scriptChannel = do_QueryInterface(chan); + if (scriptChannel) { + // Allow execution against our context if the principals match + scriptChannel->SetExecutionPolicy(nsIScriptChannel::EXECUTE_NORMAL); + } + + // AsyncOpen can fail if a file does not exist. + rv = chan->AsyncOpen(shim); + NS_ENSURE_SUCCESS(rv, rv); + LOG(("OBJLC [%p]: Channel opened", this)); + mChannel = chan; + return NS_OK; +} + +uint32_t nsObjectLoadingContent::GetCapabilities() const { + return eSupportImages | eSupportDocuments; +} + +void nsObjectLoadingContent::Destroy() { + if (mFrameLoader) { + mFrameLoader->Destroy(); + mFrameLoader = nullptr; + } + + // Reset state so that if the element is re-appended to tree again (e.g. + // adopting to another document), it will reload resource again. + UnloadObject(); +} + +/* static */ +void nsObjectLoadingContent::Traverse(nsObjectLoadingContent* tmp, + nsCycleCollectionTraversalCallback& cb) { + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFrameLoader); +} + +/* static */ +void nsObjectLoadingContent::Unlink(nsObjectLoadingContent* tmp) { + if (tmp->mFrameLoader) { + tmp->mFrameLoader->Destroy(); + } + NS_IMPL_CYCLE_COLLECTION_UNLINK(mFrameLoader); +} + +void nsObjectLoadingContent::UnloadObject(bool aResetState) { + if (mFrameLoader) { + mFrameLoader->Destroy(); + mFrameLoader = nullptr; + } + + if (aResetState) { + CloseChannel(); + mChannelLoaded = false; + mType = ObjectType::Loading; + mURI = mOriginalURI = mBaseURI = nullptr; + mContentType.Truncate(); + mOriginalContentType.Truncate(); + } + + mScriptRequested = false; + + mIsStopping = false; + + mSubdocumentIntrinsicSize.reset(); + mSubdocumentIntrinsicRatio.reset(); +} + +void nsObjectLoadingContent::NotifyStateChanged(ObjectType aOldType, + bool aNotify) { + LOG(("OBJLC [%p]: NotifyStateChanged: (%u) -> (%u) (notify %i)", this, + uint32_t(aOldType), uint32_t(mType), aNotify)); + + dom::Element* thisEl = AsElement(); + // Non-images are always not broken. + // XXX: I assume we could just remove this completely? + thisEl->RemoveStates(ElementState::BROKEN, aNotify); + + if (mType == aOldType) { + return; + } + + Document* doc = thisEl->GetComposedDoc(); + if (!doc) { + return; // Nothing to do + } + + PresShell* presShell = doc->GetPresShell(); + // If there is no PresShell or it hasn't been initialized there isn't much to + // do. + if (!presShell || !presShell->DidInitialize()) { + return; + } + presShell->PostRecreateFramesFor(thisEl); +} + +nsObjectLoadingContent::ObjectType nsObjectLoadingContent::GetTypeOfContent( + const nsCString& aMIMEType) { + Element* el = AsElement(); + NS_ASSERTION(el, "must be a content"); + + // Images and documents are always supported. + MOZ_ASSERT((GetCapabilities() & (eSupportImages | eSupportDocuments)) == + (eSupportImages | eSupportDocuments)); + + LOG( + ("OBJLC [%p]: calling HtmlObjectContentTypeForMIMEType: aMIMEType: %s - " + "el: %p\n", + this, aMIMEType.get(), el)); + auto ret = static_cast<ObjectType>( + nsContentUtils::HtmlObjectContentTypeForMIMEType(aMIMEType)); + LOG(("OBJLC [%p]: called HtmlObjectContentTypeForMIMEType\n", this)); + return ret; +} + +void nsObjectLoadingContent::CreateStaticClone( + nsObjectLoadingContent* aDest) const { + MOZ_ASSERT(aDest->AsElement()->OwnerDoc()->IsStaticDocument()); + aDest->mType = mType; + + if (mFrameLoader) { + aDest->AsElement()->OwnerDoc()->AddPendingFrameStaticClone(aDest, + mFrameLoader); + } +} + +NS_IMETHODIMP +nsObjectLoadingContent::GetSrcURI(nsIURI** aURI) { + NS_IF_ADDREF(*aURI = GetSrcURI()); + return NS_OK; +} + +void nsObjectLoadingContent::TriggerInnerFallbackLoads() { + MOZ_ASSERT(!mFrameLoader && !mChannel, + "ConfigureFallback called with loaded content"); + MOZ_ASSERT(mType == ObjectType::Fallback); + + Element* el = AsElement(); + if (!el->IsHTMLElement(nsGkAtoms::object)) { + return; + } + // Do a depth-first traverse of node tree with the current element as root, + // looking for non-<param> elements. If we find some then we have an HTML + // fallback for this element. + for (nsIContent* child = el->GetFirstChild(); child;) { + // <object> and <embed> elements in the fallback need to StartObjectLoad. + // Their children should be ignored since they are part of those element's + // fallback. + if (auto* embed = HTMLEmbedElement::FromNode(child)) { + embed->StartObjectLoad(true, true); + // Skip the children + child = child->GetNextNonChildNode(el); + } else if (auto* object = HTMLObjectElement::FromNode(child)) { + object->StartObjectLoad(true, true); + // Skip the children + child = child->GetNextNonChildNode(el); + } else { + child = child->GetNextNode(el); + } + } +} + +NS_IMETHODIMP +nsObjectLoadingContent::UpgradeLoadToDocument( + nsIChannel* aRequest, BrowsingContext** aBrowsingContext) { + AUTO_PROFILER_LABEL("nsObjectLoadingContent::UpgradeLoadToDocument", NETWORK); + + LOG(("OBJLC [%p]: UpgradeLoadToDocument", this)); + + if (aRequest != mChannel || !aRequest) { + // happens when a new load starts before the previous one got here. + return NS_BINDING_ABORTED; + } + + // We should be state loading. + if (mType != ObjectType::Loading) { + MOZ_ASSERT_UNREACHABLE("Should be type loading at this point"); + return NS_BINDING_ABORTED; + } + MOZ_ASSERT(!mChannelLoaded, "mChannelLoaded set already?"); + MOZ_ASSERT(!mFinalListener, "mFinalListener exists already?"); + + mChannelLoaded = true; + + // We don't need to check for errors here, unlike in `OnStartRequest`, as + // `UpgradeLoadToDocument` is only called when the load is going to become a + // process-switching load. As we never process switch for failed object loads, + // we know our channel status is successful. + + // Call `LoadObject` to trigger our nsObjectLoadingContext to switch into the + // specified new state. + nsresult rv = LoadObject(true, false, aRequest); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + RefPtr<BrowsingContext> bc = GetBrowsingContext(); + if (!bc) { + return NS_ERROR_FAILURE; + } + + bc.forget(aBrowsingContext); + return NS_OK; +} + +bool nsObjectLoadingContent::ShouldBlockContent() { + return mContentBlockingEnabled && mURI && IsFlashMIME(mContentType) && + StaticPrefs::browser_safebrowsing_blockedURIs_enabled(); +} + +Document* nsObjectLoadingContent::GetContentDocument( + nsIPrincipal& aSubjectPrincipal) { + Element* el = AsElement(); + if (!el->IsInComposedDoc()) { + return nullptr; + } + + Document* sub_doc = el->OwnerDoc()->GetSubDocumentFor(el); + if (!sub_doc) { + return nullptr; + } + + // Return null for cross-origin contentDocument. + if (!aSubjectPrincipal.SubsumesConsideringDomain(sub_doc->NodePrincipal())) { + return nullptr; + } + + return sub_doc; +} + +void nsObjectLoadingContent::MaybeFireErrorEvent() { + Element* el = AsElement(); + // Queue a task to fire an error event if we're an <object> element. The + // queueing is important, since then we don't have to worry about reentry. + if (el->IsHTMLElement(nsGkAtoms::object)) { + RefPtr<AsyncEventDispatcher> loadBlockingAsyncDispatcher = + new LoadBlockingAsyncEventDispatcher(el, u"error"_ns, CanBubble::eNo, + ChromeOnlyDispatch::eNo); + loadBlockingAsyncDispatcher->PostDOMEvent(); + } +} + +bool nsObjectLoadingContent::BlockEmbedOrObjectContentLoading() { + Element* el = AsElement(); + + // Traverse up the node tree to see if we have any ancestors that may block us + // from loading + for (nsIContent* parent = el->GetParent(); parent; + parent = parent->GetParent()) { + if (parent->IsAnyOfHTMLElements(nsGkAtoms::video, nsGkAtoms::audio)) { + return true; + } + // If we have an ancestor that is an object with a source, it'll have an + // associated displayed type. If that type is not null, don't load content + // for the embed. + if (auto* object = HTMLObjectElement::FromNode(parent)) { + if (object->Type() != ObjectType::Fallback) { + return true; + } + } + } + return false; +} + +void nsObjectLoadingContent::SubdocumentIntrinsicSizeOrRatioChanged( + const Maybe<IntrinsicSize>& aIntrinsicSize, + const Maybe<AspectRatio>& aIntrinsicRatio) { + if (aIntrinsicSize == mSubdocumentIntrinsicSize && + aIntrinsicRatio == mSubdocumentIntrinsicRatio) { + return; + } + + mSubdocumentIntrinsicSize = aIntrinsicSize; + mSubdocumentIntrinsicRatio = aIntrinsicRatio; + + if (nsSubDocumentFrame* sdf = do_QueryFrame(AsElement()->GetPrimaryFrame())) { + sdf->SubdocumentIntrinsicSizeOrRatioChanged(); + } +} + +void nsObjectLoadingContent::SubdocumentImageLoadComplete(nsresult aResult) { + ObjectType oldType = mType; + mLoadingSyntheticDocument = false; + + if (NS_FAILED(aResult)) { + UnloadObject(); + mType = ObjectType::Fallback; + TriggerInnerFallbackLoads(); + NotifyStateChanged(oldType, true); + return; + } + + // (mChannelLoaded && mChannel) indicates this is a good state, not any sort + // of failures. + MOZ_DIAGNOSTIC_ASSERT_IF(mChannelLoaded && mChannel, + mType == ObjectType::Document); + NotifyStateChanged(oldType, true); +} + +void nsObjectLoadingContent::MaybeStoreCrossOriginFeaturePolicy() { + MOZ_DIAGNOSTIC_ASSERT(mFrameLoader); + + // If the browsingContext is not ready (because docshell is dead), don't try + // to create one. + if (!mFrameLoader->IsRemoteFrame() && !mFrameLoader->GetExistingDocShell()) { + return; + } + + RefPtr<BrowsingContext> browsingContext = mFrameLoader->GetBrowsingContext(); + + if (!browsingContext || !browsingContext->IsContentSubframe()) { + return; + } + + Element* el = AsElement(); + if (!el->IsInComposedDoc()) { + return; + } + + FeaturePolicy* featurePolicy = el->OwnerDoc()->FeaturePolicy(); + + if (ContentChild* cc = ContentChild::GetSingleton()) { + Unused << cc->SendSetContainerFeaturePolicy(browsingContext, featurePolicy); + } +} |