[tbb-commits] [tor-browser/tor-browser-83.0-10.0-1] Bug 19273: Avoid JavaScript patching of the external app helper dialog.
sysrqb at torproject.org
sysrqb at torproject.org
Thu Nov 26 14:53:02 UTC 2020
commit 3365ab1778dc83cac32bac5d8f3f184081b583ae
Author: Kathy Brade <brade at pearlcrescent.com>
Date: 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 | 207 +++++++++++++++++----
uriloader/exthandler/nsExternalHelperAppService.h | 3 +
.../exthandler/nsIExternalHelperAppService.idl | 47 +++++
3 files changed, 222 insertions(+), 35 deletions(-)
diff --git a/uriloader/exthandler/nsExternalHelperAppService.cpp b/uriloader/exthandler/nsExternalHelperAppService.cpp
index 8e38cbf6e3fa..93e01ed472c3 100644
--- a/uriloader/exthandler/nsExternalHelperAppService.cpp
+++ b/uriloader/exthandler/nsExternalHelperAppService.cpp
@@ -133,6 +133,9 @@ 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";
+
// Helper functions for Content-Disposition headers
/**
@@ -389,6 +392,22 @@ static nsresult GetDownloadDirectory(nsIFile** _directory,
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
@@ -576,6 +595,111 @@ static const char* descriptionOverwriteExtensions[] = {
"avif", "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);
+
+ protected:
+ ~nsExternalLoadURIHandler();
+
+ nsCOMPtr<nsIHandlerInfo> mHandlerInfo;
+ nsCOMPtr<nsIURI> mURI;
+ nsCOMPtr<nsIPrincipal> mTriggeringPrincipal;
+ RefPtr<BrowsingContext> mBrowsingContext;
+ 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)
+ : mHandlerInfo(aHandlerInfo),
+ mURI(aURI),
+ mTriggeringPrincipal(aTriggeringPrincipal),
+ mBrowsingContext(aBrowsingContext)
+
+{
+ 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;
+
+ nsHandlerInfoAction preferredAction;
+ mHandlerInfo->GetPreferredAction(&preferredAction);
+ bool alwaysAsk = true;
+ mHandlerInfo->GetAlwaysAskBeforeHandling(&alwaysAsk);
+
+ nsresult rv = NS_OK;
+ // If we are not supposed to ask, and the preferred action is to use
+ // a helper app or the system default, we just launch the URI.
+ if (!alwaysAsk && (preferredAction == nsIHandlerInfo::useHelperApp ||
+ preferredAction == nsIHandlerInfo::useSystemDefault)) {
+ rv = mHandlerInfo->LaunchWithURI(mURI, mBrowsingContext);
+ // We are not supposed to ask, but when file not found the user most likely
+ // uninstalled the application which handles the uri so we will continue
+ // by application chooser dialog.
+ if (rv != NS_ERROR_FILE_NOT_FOUND) {
+ return rv;
+ }
+ }
+
+ nsCOMPtr<nsIContentDispatchChooser> chooser =
+ do_CreateInstance("@mozilla.org/content-dispatch-chooser;1", &rv);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ return chooser->Ask(mHandlerInfo, mURI, mTriggeringPrincipal,
+ mBrowsingContext,
+ nsIContentDispatchChooser::REASON_CANNOT_HANDLE);
+}
+
+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;
/**
@@ -602,6 +726,9 @@ nsExternalHelperAppService::GetSingleton() {
return do_AddRef(sExtHelperAppSvcSingleton);
}
+//////////////////////////////////////////////////////////////////////////////////////////////////////
+// nsExternalHelperAppService definition and implementation
+//////////////////////////////////////////////////////////////////////////////////////////////////////
NS_IMPL_ISUPPORTS(nsExternalHelperAppService, nsIExternalHelperAppService,
nsPIExternalAppLauncher, nsIExternalProtocolService,
nsIMIMEService, nsIObserver, nsISupportsWeakReference)
@@ -1045,30 +1172,13 @@ nsExternalHelperAppService::LoadURI(nsIURI* aURI,
rv = GetProtocolHandlerInfo(scheme, getter_AddRefs(handler));
NS_ENSURE_SUCCESS(rv, rv);
- nsHandlerInfoAction preferredAction;
- handler->GetPreferredAction(&preferredAction);
- bool alwaysAsk = true;
- handler->GetAlwaysAskBeforeHandling(&alwaysAsk);
-
- // if we are not supposed to ask, and the preferred action is to use
- // a helper app or the system default, we just launch the URI.
- if (!alwaysAsk && (preferredAction == nsIHandlerInfo::useHelperApp ||
- preferredAction == nsIHandlerInfo::useSystemDefault)) {
- rv = handler->LaunchWithURI(uri, aBrowsingContext);
- // We are not supposed to ask, but when file not found the user most likely
- // uninstalled the application which handles the uri so we will continue
- // by application chooser dialog.
- if (rv != NS_ERROR_FILE_NOT_FOUND) {
- return rv;
- }
+ RefPtr<nsExternalLoadURIHandler> h = new nsExternalLoadURIHandler(
+ handler, uri, aTriggeringPrincipal, aBrowsingContext);
+ if (!h) {
+ return NS_ERROR_OUT_OF_MEMORY;
}
- nsCOMPtr<nsIContentDispatchChooser> chooser =
- do_CreateInstance("@mozilla.org/content-dispatch-chooser;1", &rv);
- NS_ENSURE_SUCCESS(rv, rv);
-
- return chooser->Ask(handler, uri, aTriggeringPrincipal, aBrowsingContext,
- nsIContentDispatchChooser::REASON_CANNOT_HANDLE);
+ return NS_OK;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -1213,6 +1323,7 @@ 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)
@@ -1575,18 +1686,7 @@ 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) {
@@ -1717,6 +1817,34 @@ 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...
@@ -1800,6 +1928,7 @@ NS_IMETHODIMP nsExternalAppHandler::OnStartRequest(nsIRequest* request) {
action = nsIMIMEInfo::saveToDisk;
}
+ nsresult rv = NS_OK;
if (alwaysAsk) {
// Display the dialog
mDialog = do_CreateInstance(NS_HELPERAPPLAUNCHERDLG_CONTRACTID, &rv);
@@ -1857,6 +1986,14 @@ 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);
+}
+
// Convert error info into proper message text and send OnStatusChange
// notification to the dialog progress listener or nsITransfer implementation.
void nsExternalAppHandler::SendStatusChange(ErrorType type, nsresult rv,
@@ -2521,7 +2658,7 @@ 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 1edde606dc65..e732b6063f59 100644
--- a/uriloader/exthandler/nsExternalHelperAppService.h
+++ b/uriloader/exthandler/nsExternalHelperAppService.h
@@ -219,6 +219,7 @@ class nsExternalHelperAppService : public nsIExternalHelperAppService,
*/
class nsExternalAppHandler final : public nsIStreamListener,
public nsIHelperAppLauncher,
+ public nsIHelperAppWarningLauncher,
public nsIBackgroundFileSaverObserver,
public nsINamed {
public:
@@ -226,6 +227,7 @@ 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
@@ -485,6 +487,7 @@ 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 657e15bc0742..ebdb1cdacf78 100644
--- a/uriloader/exthandler/nsIExternalHelperAppService.idl
+++ b/uriloader/exthandler/nsIExternalHelperAppService.idl
@@ -177,3 +177,50 @@ 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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