Re: [PATCH] Add resolve-relative-reference in (web uri), as in RFC 3986 5.2.

[Vivien Kraus]

Le mercredi 04 octobre 2023 à 00:30 +0200, Maxime Devos a écrit :
> 
> >       The best prevention is not allowing redirects at all or only
> >       allowing redirections that keep the hostname intact -- while
> > an
> >       option for much software, it isn't an option for web
> > browsers.
> 
> Partially scratch that -- restricting to ‘keeping hostname intact’ is
> insufficient, because there could be a DNS record that points
> 'website 
> via http' to 127.0.0.1, and hence a redirect from https://website -->
> http://website can change IP addresses from global Internet to local 
> computer.

But then, it is not a problem with resolve-relative-reference, and not
even a risk with redirections; if the DNS changes before you query the
page, then the secret page leaks anyway, no redirection needed.

We could add a warning in the "http-request" method documentation,
like:

Be warned that if you are hosting a private HTTP(s) server on your
system, a DNS change for a public target URI to your internal IP
address, or following a redirection from a public target URI to your
private server, may lead you to consider the response originating from
your private server as public.

Would that be a good summary?

Vivien