[tor-commits] [tor-browser] 56/70: Bug 19273: Avoid JavaScript patching of the external app helper dialog.
gitolite role
git at cupani.torproject.org
Tue Aug 23 09:14:25 UTC 2022
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pierov pushed a commit to branch tor-browser-102.2.0esr-12.0-1
in repository tor-browser.
commit d58aa16073250276e6a049907205c6d89dc07583
Author: Kathy Brade <brade at pearlcrescent.com>
AuthorDate: Tue Jun 28 15:13:05 2016 -0400
Bug 19273: Avoid JavaScript patching of the external app helper dialog.
When handling an external URI or downloading a file, invoke Torbutton's
external app blocker component (which will present a download warning
dialog unless the user has checked the "Automatically download files
from now on" box).
For e10s compatibility, avoid using a modal dialog and instead use
a callback interface (nsIHelperAppWarningLauncher) to allow Torbutton
to indicate the user's desire to cancel or continue each request.
Other bugs fixed:
Bug 21766: Crash with e10s enabled while trying to download a file
Bug 21886: Download is stalled in non-e10s mode
Bug 22471: Downloading files via the PDF viewer download button is broken
Bug 22472: Fix FTP downloads when external helper app dialog is shown
Bug 22610: Avoid crashes when canceling external helper app downloads
Bug 22618: Downloading pdf file via file:/// is stalling
---
.../exthandler/nsExternalHelperAppService.cpp | 192 +++++++++++++++++----
uriloader/exthandler/nsExternalHelperAppService.h | 3 +
.../exthandler/nsIExternalHelperAppService.idl | 47 +++++
3 files changed, 209 insertions(+), 33 deletions(-)
diff --git a/uriloader/exthandler/nsExternalHelperAppService.cpp b/uriloader/exthandler/nsExternalHelperAppService.cpp
index f3490531ed808..133f479326825 100644
--- a/uriloader/exthandler/nsExternalHelperAppService.cpp
+++ b/uriloader/exthandler/nsExternalHelperAppService.cpp
@@ -144,6 +144,9 @@ static const char NEVER_ASK_FOR_SAVE_TO_DISK_PREF[] =
static const char NEVER_ASK_FOR_OPEN_FILE_PREF[] =
"browser.helperApps.neverAsk.openFile";
+static const char WARNING_DIALOG_CONTRACT_ID[] =
+ "@torproject.org/torbutton-extAppBlocker;1";
+
StaticRefPtr<nsIFile> sFallbackDownloadDir;
// Helper functions for Content-Disposition headers
@@ -395,6 +398,22 @@ nsresult GenerateRandomName(nsACString& result) {
return NS_OK;
}
+static already_AddRefed<nsIInterfaceRequestor> GetDialogParentAux(
+ BrowsingContext* aBrowsingContext, nsIInterfaceRequestor* aWindowContext) {
+ nsCOMPtr<nsIInterfaceRequestor> dialogParent = aWindowContext;
+
+ if (!dialogParent && aBrowsingContext) {
+ dialogParent = do_QueryInterface(aBrowsingContext->GetDOMWindow());
+ }
+ if (!dialogParent && aBrowsingContext && XRE_IsParentProcess()) {
+ RefPtr<Element> element = aBrowsingContext->Top()->GetEmbedderElement();
+ if (element) {
+ dialogParent = do_QueryInterface(element->OwnerDoc()->GetWindow());
+ }
+ }
+ return dialogParent.forget();
+}
+
/**
* Structure for storing extension->type mappings.
* @see defaultMimeEntries
@@ -593,6 +612,96 @@ static const char* descriptionOverwriteExtensions[] = {
"avif", "jxl", "pdf", "svg", "webp", "xml",
};
+//////////////////////////////////////////////////////////////////////////////////////////////////////
+// begin nsExternalLoadURIHandler class definition and implementation
+//////////////////////////////////////////////////////////////////////////////////////////////////////
+class nsExternalLoadURIHandler final : public nsIHelperAppWarningLauncher {
+ public:
+ NS_DECL_THREADSAFE_ISUPPORTS
+ NS_DECL_NSIHELPERAPPWARNINGLAUNCHER
+
+ nsExternalLoadURIHandler(nsIHandlerInfo* aHandlerInfo, nsIURI* aURI,
+ nsIPrincipal* aTriggeringPrincipal,
+ BrowsingContext* aBrowsingContext,
+ bool aTriggeredExternally);
+
+ protected:
+ ~nsExternalLoadURIHandler();
+
+ nsCOMPtr<nsIHandlerInfo> mHandlerInfo;
+ nsCOMPtr<nsIURI> mURI;
+ nsCOMPtr<nsIPrincipal> mTriggeringPrincipal;
+ RefPtr<BrowsingContext> mBrowsingContext;
+ bool mTriggeredExternally;
+ nsCOMPtr<nsIHelperAppWarningDialog> mWarningDialog;
+};
+
+NS_IMPL_ADDREF(nsExternalLoadURIHandler)
+NS_IMPL_RELEASE(nsExternalLoadURIHandler)
+
+NS_INTERFACE_MAP_BEGIN(nsExternalLoadURIHandler)
+ NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIHelperAppWarningLauncher)
+ NS_INTERFACE_MAP_ENTRY(nsIHelperAppWarningLauncher)
+NS_INTERFACE_MAP_END
+
+nsExternalLoadURIHandler::nsExternalLoadURIHandler(
+ nsIHandlerInfo* aHandlerInfo, nsIURI* aURI,
+ nsIPrincipal* aTriggeringPrincipal, BrowsingContext* aBrowsingContext,
+ bool aTriggeredExternally)
+ : mHandlerInfo(aHandlerInfo),
+ mURI(aURI),
+ mTriggeringPrincipal(aTriggeringPrincipal),
+ mBrowsingContext(aBrowsingContext),
+ mTriggeredExternally(aTriggeredExternally)
+
+{
+ nsresult rv = NS_OK;
+ mWarningDialog = do_CreateInstance(WARNING_DIALOG_CONTRACT_ID, &rv);
+ if (NS_SUCCEEDED(rv) && mWarningDialog) {
+ // This will create a reference cycle (the dialog holds a reference to us
+ // as nsIHelperAppWarningLauncher), which will be broken in ContinueRequest
+ // or CancelRequest.
+ nsCOMPtr<nsIInterfaceRequestor> dialogParent =
+ GetDialogParentAux(aBrowsingContext, nullptr);
+ rv = mWarningDialog->MaybeShow(this, dialogParent);
+ }
+
+ if (NS_FAILED(rv)) {
+ // If for some reason we could not open the download warning prompt,
+ // continue with the request.
+ ContinueRequest();
+ }
+}
+
+nsExternalLoadURIHandler::~nsExternalLoadURIHandler() {}
+
+NS_IMETHODIMP nsExternalLoadURIHandler::ContinueRequest() {
+ MOZ_ASSERT(mURI);
+ MOZ_ASSERT(mHandlerInfo);
+
+ // Break our reference cycle with the download warning dialog (set up in
+ // LoadURI).
+ mWarningDialog = nullptr;
+
+ nsresult rv = NS_OK;
+ nsCOMPtr<nsIContentDispatchChooser> chooser =
+ do_CreateInstance("@mozilla.org/content-dispatch-chooser;1", &rv);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ return chooser->HandleURI(mHandlerInfo, mURI, mTriggeringPrincipal,
+ mBrowsingContext, mTriggeredExternally);
+}
+
+NS_IMETHODIMP nsExternalLoadURIHandler::CancelRequest(nsresult aReason) {
+ NS_ENSURE_ARG(NS_FAILED(aReason));
+
+ // Break our reference cycle with the download warning dialog (set up in
+ // LoadURI).
+ mWarningDialog = nullptr;
+
+ return NS_OK;
+}
+
static StaticRefPtr<nsExternalHelperAppService> sExtHelperAppSvcSingleton;
/**
@@ -615,6 +724,9 @@ nsExternalHelperAppService::GetSingleton() {
return do_AddRef(sExtHelperAppSvcSingleton);
}
+//////////////////////////////////////////////////////////////////////////////////////////////////////
+// nsExternalHelperAppService definition and implementation
+//////////////////////////////////////////////////////////////////////////////////////////////////////
NS_IMPL_ISUPPORTS(nsExternalHelperAppService, nsIExternalHelperAppService,
nsPIExternalAppLauncher, nsIExternalProtocolService,
nsIMIMEService, nsIObserver, nsISupportsWeakReference)
@@ -1127,14 +1239,15 @@ nsExternalHelperAppService::LoadURI(nsIURI* aURI,
rv = GetProtocolHandlerInfo(scheme, getter_AddRefs(handler));
NS_ENSURE_SUCCESS(rv, rv);
- nsCOMPtr<nsIContentDispatchChooser> chooser =
- do_CreateInstance("@mozilla.org/content-dispatch-chooser;1", &rv);
- NS_ENSURE_SUCCESS(rv, rv);
-
- return chooser->HandleURI(
+ RefPtr<nsExternalLoadURIHandler> h = new nsExternalLoadURIHandler(
handler, escapedURI,
aRedirectPrincipal ? aRedirectPrincipal : aTriggeringPrincipal,
aBrowsingContext, aTriggeredExternally);
+ if (!h) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ return NS_OK;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -1279,6 +1392,7 @@ NS_INTERFACE_MAP_BEGIN(nsExternalAppHandler)
NS_INTERFACE_MAP_ENTRY(nsIStreamListener)
NS_INTERFACE_MAP_ENTRY(nsIRequestObserver)
NS_INTERFACE_MAP_ENTRY(nsIHelperAppLauncher)
+ NS_INTERFACE_MAP_ENTRY(nsIHelperAppWarningLauncher)
NS_INTERFACE_MAP_ENTRY(nsICancelable)
NS_INTERFACE_MAP_ENTRY(nsIBackgroundFileSaverObserver)
NS_INTERFACE_MAP_ENTRY(nsINamed)
@@ -1533,18 +1647,7 @@ void nsExternalAppHandler::MaybeApplyDecodingForExtension(
already_AddRefed<nsIInterfaceRequestor>
nsExternalAppHandler::GetDialogParent() {
- nsCOMPtr<nsIInterfaceRequestor> dialogParent = mWindowContext;
-
- if (!dialogParent && mBrowsingContext) {
- dialogParent = do_QueryInterface(mBrowsingContext->GetDOMWindow());
- }
- if (!dialogParent && mBrowsingContext && XRE_IsParentProcess()) {
- RefPtr<Element> element = mBrowsingContext->Top()->GetEmbedderElement();
- if (element) {
- dialogParent = do_QueryInterface(element->OwnerDoc()->GetWindow());
- }
- }
- return dialogParent.forget();
+ return GetDialogParentAux(mBrowsingContext, mWindowContext);
}
NS_IMETHODIMP nsExternalAppHandler::OnStartRequest(nsIRequest* request) {
@@ -1692,6 +1795,34 @@ NS_IMETHODIMP nsExternalAppHandler::OnStartRequest(nsIRequest* request) {
loadInfo->SetForceAllowDataURI(true);
}
+ mWarningDialog = do_CreateInstance(WARNING_DIALOG_CONTRACT_ID, &rv);
+ if (NS_SUCCEEDED(rv) && mWarningDialog) {
+ // This will create a reference cycle (the dialog holds a reference to us
+ // as nsIHelperAppWarningLauncher), which will be broken in ContinueRequest
+ // or CancelRequest.
+ nsCOMPtr<nsIInterfaceRequestor> dialogParent = GetDialogParent();
+ rv = mWarningDialog->MaybeShow(this, dialogParent);
+ }
+
+ if (NS_FAILED(rv)) {
+ // If for some reason we could not open the download warning prompt,
+ // continue with the request.
+ ContinueRequest();
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP nsExternalAppHandler::ContinueRequest() {
+ nsAutoCString MIMEType;
+ if (mMimeInfo) {
+ mMimeInfo->GetMIMEType(MIMEType);
+ }
+
+ // Break our reference cycle with the download warning dialog (set up in
+ // OnStartRequest).
+ mWarningDialog = nullptr;
+
// now that the temp file is set up, find out if we need to invoke a dialog
// asking the user what they want us to do with this content...
@@ -1837,7 +1968,7 @@ NS_IMETHODIMP nsExternalAppHandler::OnStartRequest(nsIRequest* request) {
GetTargetFile(getter_AddRefs(fileToTest));
if (fileToTest) {
bool isExecutable;
- rv = fileToTest->IsExecutable(&isExecutable);
+ nsresult rv = fileToTest->IsExecutable(&isExecutable);
if (NS_FAILED(rv) || mTempFileIsExecutable ||
isExecutable) { // checking NS_FAILED, because paranoia is good
alwaysAsk = true;
@@ -1853,20 +1984,7 @@ NS_IMETHODIMP nsExternalAppHandler::OnStartRequest(nsIRequest* request) {
}
#endif
- nsAutoCString actionTelem;
- if (alwaysAsk) {
- actionTelem.AssignLiteral("ask");
- } else if (shouldAutomaticallyHandleInternally) {
- actionTelem.AssignLiteral("internal");
- } else if (action == nsIMIMEInfo::useHelperApp ||
- action == nsIMIMEInfo::useSystemDefault) {
- actionTelem.AssignLiteral("external");
- } else {
- actionTelem.AssignLiteral("save");
- }
-
- RecordDownloadTelemetry(aChannel, actionTelem.get());
-
+ nsresult rv = NS_OK;
if (alwaysAsk) {
// Display the dialog
mDialog = do_CreateInstance(NS_HELPERAPPLAUNCHERDLG_CONTRACTID, &rv);
@@ -1896,6 +2014,14 @@ NS_IMETHODIMP nsExternalAppHandler::OnStartRequest(nsIRequest* request) {
return NS_OK;
}
+NS_IMETHODIMP nsExternalAppHandler::CancelRequest(nsresult aReason) {
+ // Break our reference cycle with the download warning dialog (set up in
+ // OnStartRequest).
+ mWarningDialog = nullptr;
+
+ return Cancel(aReason);
+}
+
void nsExternalAppHandler::RecordDownloadTelemetry(nsIChannel* aChannel,
const char* aAction) {
// Telemetry for helper app dialog
@@ -2753,7 +2879,7 @@ NS_IMETHODIMP nsExternalAppHandler::Cancel(nsresult aReason) {
}
// Break our reference cycle with the helper app dialog (set up in
- // OnStartRequest)
+ // ContinueRequest)
mDialog = nullptr;
mRequest = nullptr;
diff --git a/uriloader/exthandler/nsExternalHelperAppService.h b/uriloader/exthandler/nsExternalHelperAppService.h
index ce142a4f5b6b0..7677bc53ec875 100644
--- a/uriloader/exthandler/nsExternalHelperAppService.h
+++ b/uriloader/exthandler/nsExternalHelperAppService.h
@@ -256,6 +256,7 @@ class nsExternalHelperAppService : public nsIExternalHelperAppService,
*/
class nsExternalAppHandler final : public nsIStreamListener,
public nsIHelperAppLauncher,
+ public nsIHelperAppWarningLauncher,
public nsIBackgroundFileSaverObserver,
public nsINamed {
public:
@@ -263,6 +264,7 @@ class nsExternalAppHandler final : public nsIStreamListener,
NS_DECL_NSISTREAMLISTENER
NS_DECL_NSIREQUESTOBSERVER
NS_DECL_NSIHELPERAPPLAUNCHER
+ NS_DECL_NSIHELPERAPPWARNINGLAUNCHER
NS_DECL_NSICANCELABLE
NS_DECL_NSIBACKGROUNDFILESAVEROBSERVER
NS_DECL_NSINAMED
@@ -533,6 +535,7 @@ class nsExternalAppHandler final : public nsIStreamListener,
nsCOMPtr<nsITransfer> mTransfer;
nsCOMPtr<nsIHelperAppLauncherDialog> mDialog;
+ nsCOMPtr<nsIHelperAppWarningDialog> mWarningDialog;
/**
diff --git a/uriloader/exthandler/nsIExternalHelperAppService.idl b/uriloader/exthandler/nsIExternalHelperAppService.idl
index 3554c69aaced1..fdcfc0be194d4 100644
--- a/uriloader/exthandler/nsIExternalHelperAppService.idl
+++ b/uriloader/exthandler/nsIExternalHelperAppService.idl
@@ -186,3 +186,50 @@ interface nsIHelperAppLauncher : nsICancelable
*/
readonly attribute uint64_t browsingContextId;
};
+
+/**
+ * nsIHelperAppWarningLauncher is implemented by two classes:
+ * nsExternalLoadURIHandler
+ * nsExternalAppHandler
+ */
+[scriptable, uuid(cffd508b-4aaf-43ad-99c6-671d35cbc558)]
+interface nsIHelperAppWarningLauncher : nsISupports
+{
+ /**
+ * Callback invoked by the external app warning dialog to continue the
+ * request.
+ * NOTE: This will release the reference to the nsIHelperAppWarningDialog.
+ */
+ void continueRequest();
+
+ /**
+ * Callback invoked by the external app warning dialog to cancel the request.
+ * NOTE: This will release the reference to the nsIHelperAppWarningDialog.
+ *
+ * @param aReason
+ * Pass a failure code to indicate the reason why this operation is
+ * being canceled. It is an error to pass a success code.
+ */
+ void cancelRequest(in nsresult aReason);
+};
+
+/**
+ * nsIHelperAppWarningDialog is implemented by Torbutton's external app
+ * blocker (src/components/external-app-blocker.js).
+ */
+[scriptable, uuid(f4899a3f-0df3-42cc-9db8-bdf599e5a208)]
+interface nsIHelperAppWarningDialog : nsISupports
+{
+ /**
+ * Possibly show a launch warning dialog (it will not be shown if the user
+ * has chosen to not see the warning again).
+ *
+ * @param aLauncher
+ * A nsIHelperAppWarningLauncher to be invoked after the user confirms
+ * or cancels the download.
+ * @param aWindowContext
+ * The window associated with the download.
+ */
+ void maybeShow(in nsIHelperAppWarningLauncher aLauncher,
+ in nsISupports aWindowContext);
+};
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