uint32_t
TabContext::BrowserOwnerAppId() const
{
if (IsBrowserElement()) {
return mContainingAppId;
}
return NO_APP_ID;
}
already_AddRefed<mozIApplication>
TabContext::GetBrowserOwnerApp() const
{
nsCOMPtr<mozIApplication> ownerApp;
if (IsBrowserElement()) {
ownerApp = mContainingApp;
}
return ownerApp.forget();
}
bool
nsIContentParent::CanOpenBrowser(const IPCTabContext& aContext)
{
const IPCTabAppBrowserContext& appBrowser = aContext.appBrowserContext();
// We don't trust the IPCTabContext we receive from the child, so we'll bail
// if we receive an IPCTabContext that's not a PopupIPCTabContext.
// (PopupIPCTabContext lets the child process prove that it has access to
// the app it's trying to open.)
if (appBrowser.type() != IPCTabAppBrowserContext::TPopupIPCTabContext) {
ASSERT_UNLESS_FUZZING("Unexpected IPCTabContext type. Aborting AllocPBrowserParent.");
return false;
}
const PopupIPCTabContext& popupContext = appBrowser.get_PopupIPCTabContext();
if (popupContext.opener().type() != PBrowserOrId::TPBrowserParent) {
ASSERT_UNLESS_FUZZING("Unexpected PopupIPCTabContext type. Aborting AllocPBrowserParent.");
return false;
}
auto opener = TabParent::GetFrom(popupContext.opener().get_PBrowserParent());
if (!opener) {
ASSERT_UNLESS_FUZZING("Got null opener from child; aborting AllocPBrowserParent.");
return false;
}
// Popup windows of isBrowser frames must be isBrowser if the parent
// isBrowser. Allocating a !isBrowser frame with same app ID would allow
// the content to access data it's not supposed to.
if (!popupContext.isBrowserElement() && opener->IsBrowserElement()) {
ASSERT_UNLESS_FUZZING("Child trying to escalate privileges! Aborting AllocPBrowserParent.");
return false;
}
MaybeInvalidTabContext tc(aContext);
if (!tc.IsValid()) {
NS_ERROR(nsPrintfCString("Child passed us an invalid TabContext. (%s) "
"Aborting AllocPBrowserParent.",
tc.GetInvalidReason()).get());
return false;
}
return true;
}
bool
TabContext::IsBrowserOrApp() const
{
return HasOwnApp() || IsBrowserElement();
}