linux-kernel - Re: [PATCH] sctp: initialize endpoint LSM labels also on the client side

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Message-ID: <CAFqZXNuPwbwTD4KqQfc1+RtLswR3a=j4aFMYPf7rnxkkZMLvMA@mail.gmail.com>
Date:   Mon, 25 Oct 2021 09:55:36 +0200
From:   Ondrej Mosnacek <omosnace@...hat.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        "linux-sctp @ vger . kernel . org" <linux-sctp@...r.kernel.org>,
        network dev <netdev@...r.kernel.org>,
        SElinux list <selinux@...r.kernel.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Richard Haines <richard_c_haines@...nternet.com>
Subject: Re: [PATCH] sctp: initialize endpoint LSM labels also on the client side

On Fri, Oct 22, 2021 at 8:33 AM Xin Long <lucien.xin@...il.com> wrote:
> On Thu, Oct 21, 2021 at 11:55 PM Marcelo Ricardo Leitner
> <marcelo.leitner@...il.com> wrote:
> >
> > On Thu, Oct 21, 2021 at 05:38:46PM +0200, Ondrej Mosnacek wrote:
> > > The secid* fields in struct sctp_endpoint are used to initialize the
> > > labels of a peeloff socket created from the given association. Currently
> > > they are initialized properly when a new association is created on the
> > > server side (upon receiving an INIT packet), but not on the client side.
> >
> > +Cc Xin
> Thanks Marcelo,
>
> security_sctp_assoc_request() is not supposed to call on the client side,
> as we can see on TCP. The client side's labels should be set to the
> connection by selinux_inet_conn_request(). But we can't do it based
> on the current hooks.
>
> The root problem is that the current hooks incorrectly treat sctp_endpoint
> in SCTP as request_sock in TCP, while it should've been sctp_association.
> We need a bigger change on the current security sctp code.
>
> I will post the patch series in hand, please take a look.

Thanks, your patches indeed seem to do the right thing and they also
do pass selinux-testsuite with the added client peeloff tests (as also
confirmed by Richard already). I have just a few minor comments, which
I'll send as replies to the individual patches.

--
Ondrej Mosnacek
Software Engineer, Linux Security - SELinux kernel
Red Hat, Inc.