Hi Patrick,
Filtering out X-AppEngine prefixed headers is intentional, and we certainly
expect to continue doing so.
-Nick Johnson
On Mon, Feb 1, 2010 at 8:29 PM, Patrick Linskey <plins...@gmail.com> wrote:
> > (and Require Admin login isn't enough)
>
> That would be enough, but the only way to do that is to put the
> limitation in the web.xml file, which is pretty far away from the
> servlet in question. I want to make sure that someone doesn't
> accidentally mis-configure the web.xml file to remove the admin
> restriction. And I'd really rather not parse web.xml and apply all the
> appropriate rules to do so.
>
> Also, I don't know whether or not Google guarantees that the X-
> AppEngine-TaskName header is stripped from malicious incoming
> requests. It looks like it does, but that's just based on my
> observations.
>
> Thanks,
>
> -Patrick
>
> On Feb 1, 11:02 am, Eli Jones <eli.jo...@gmail.com> wrote:
> > If you have a compelling reason for really locking down the task queue
> url
> > (and Require Admin login isn't enough), you could create a mechanism that
> > creates a task name for each queued task.. and the task verifies that its
> > name is "correct".
> >
> > You could have the task use the X-AppEngine-TaskName header to check its
> > name..
> >
> > So.. when you add a task to the queue.. you do something like this:
> >
> > taskName = getUniqueTaskName()
> > nameHash = getHash(taskName)
> >
> > taskqueue.add(url = '/myTaskQueue', countdown = 0,
> > name = taskName,
> > params = {'nameHash' : nameHash})
> >
> > and.. in the first part of the /myTaskQueue code.. you could have it
> verify
> > that the 'nameHash' param is equal to getHash() of the TaskName you grab
> > from the header..
> >
> >
> >
> > On Sat, Jan 30, 2010 at 4:07 PM, Patrick Linskey <plins...@gmail.com>
> wrote:
> > > Hi,
> >
> > > I'd like to programmatically ensure that my task queue servlets are
> > > only invoked via the task queue. I've got a security constraint in my
> > > web.xml, but I'd like to also check in code to avoid any potential mis-
> > > configuration in the future.
> >
> > > Is there any supported means to do such a check?
> >
> > > I tried looking at the contents of the HttpServletRequest (isUserInRole
> > > (), getAuthType(), getUserPrincipal(), getRemoteName()), to no avail.
> > > I also tried UserServiceFactory.getUserService().isAdmin(), but
> > > received an exception informing me that no user was logged in.
> >
> > > I can see that there are a number of task queue-specific HTTP headers.
> > > Currently, I'm checking that X-AppEngine-TaskRetryCount is present,
> > > and if so, assuming that the request has come from the task queue and
> > > that it's therefore safe to process. Empirically, it looks like GAE
> > > strips out the X-AppEngine-TaskRetryCount header when I specify it in
> > > a curl-sourced request. Is this a safe assumption to rely on? Are
> > > there plans to document a reliable way to ensure servlet security in a
> > > task queue environment? Is there something else that I'm missing?
> >
> > > Also, in an ideal world, it'd be nice if request.isUserInRole("admin")
> > > would return true at the appropriate times.
> >
> > > Thanks,
> >
> > > -Patrick
> >
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--
Nick Johnson, Developer Programs Engineer, App Engine
Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number:
368047
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