linux-kernel - Re: [PATCH ghak25 v6] audit: add subj creds to NETFILTER

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Date:   Wed, 20 May 2020 14:51:26 -0400
From:   Steve Grubb <sgrubb@...hat.com>
To:     linux-audit@...hat.com
Cc:     Paul Moore <paul@...l-moore.com>,
        Richard Guy Briggs <rgb@...hat.com>, fw@...len.de,
        LKML <linux-kernel@...r.kernel.org>,
        netfilter-devel@...r.kernel.org, twoerner@...hat.com,
        Eric Paris <eparis@...isplace.org>, tgraf@...radead.org
Subject: Re: [PATCH ghak25 v6] audit: add subj creds to NETFILTER_CFG record to cover async unregister

On Wednesday, May 20, 2020 2:40:45 PM EDT Paul Moore wrote:
> On Wed, May 20, 2020 at 12:55 PM Richard Guy Briggs <rgb@...hat.com> wrote:
> > On 2020-05-20 12:51, Richard Guy Briggs wrote:
> > > Some table unregister actions seem to be initiated by the kernel to
> > > garbage collect unused tables that are not initiated by any userspace
> > > actions.  It was found to be necessary to add the subject credentials
> > > to cover this case to reveal the source of these actions.  A sample
> > > record:
> > > 
> > > The uid, auid, tty, ses and exe fields have not been included since
> > > they
> > > are in the SYSCALL record and contain nothing useful in the non-user
> > > context.
> > > 
> > >   type=NETFILTER_CFG msg=audit(2020-03-11 21:25:21.491:269) : table=nat
> > >   family=bridge entries=0 op=unregister pid=153
> > >   subj=system_u:system_r:kernel_t:s0 comm=kworker/u4:2
>
> FWIW, that record looks good.

It's severely broken

cat log.file
type=NETFILTER_CFG msg=audit(2020-03-11 21:25:21.491:269) : table=nat 
family=bridge entries=0 op=unregister pid=153 
subj=system_u:system_r:kernel_t:s0 comm=kworker/u4:2

ausearch -if log.file --format text
At 19:33:40 12/31/1969  did-unknown 

ausearch -if log.file --format csv
NODE,EVENT,DATE,TIME,SERIAL_NUM,EVENT_KIND,SESSION,SUBJ_PRIME,SUBJ_SEC,SUBJ_KIND,ACTION,RESULT,OBJ_PRIME,OBJ_SEC,OBJ_KIND,HOW
error normalizing NETFILTER_CFG
,NETFILTER_CFG,12/31/1969,19:33:40,0,,,,,,,,,,

This is unusable. This is why the bug was filed in the first place.

-Steve

> > > Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> > 
> > Self-NACK.  I forgot to remove cred and tty declarations.