From: Charles Forsyth <charles.forsyth@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] p9any auth in u9fs: uid value in ticked is ignored
Date: Mon, 10 Oct 2011 13:39:14 +0100 [thread overview]
Message-ID: <CAOw7k5jYgQKeELmybstA_-9JMDxdCJ3wae_Jm4oh9-uxyMAEww@mail.gmail.com> (raw)
In-Reply-To: <CAG3N4d-DWRpC+UZkgJQWYxgEwUi+jSzgMN=wVV+_J5Fq0eDEBw@mail.gmail.com>
It's true that the server must take account of the result of
authentication, but although that might not
mean identity, the results of authentication should be consistent with
the name presented as uname
in Tauth/Tattach. In the context of p9auth I think that means that the
cuid of AuthInfo should match.
That doesn't preclude the server from having a more subtle acquisition
of authority, for instance by
having an auth file that's kept open, allowing incremental
authentication using another protocol.
On 10 October 2011 13:07, Yaroslav <yarikos@gmail.com> wrote:
> There is a security problem with p9auth in u9fs: it uses uname from
> Tauth/Tattach as user's identity - ignoring the user id which has been
> authenticated to the auth server. As uname is always set to up->user
> in devmnt, this means that:
>
next prev parent reply other threads:[~2011-10-10 12:39 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-10 12:07 Yaroslav
2011-10-10 12:39 ` Charles Forsyth [this message]
2011-10-10 14:01 ` Yaroslav
2011-10-10 16:18 ` Charles Forsyth
2011-10-10 20:47 ` Yaroslav
2011-10-10 22:03 ` Charles Forsyth
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