linux-kernel - Re: [PATCH ghak25 v2 7/9] netfilter: ebtables audit table registration

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Message-ID: <CAHC9VhS4Cz1T=hycPVz3aCzOpPX-EDzwh284YQ2V5rUM7BJkzg@mail.gmail.com>
Date:   Thu, 30 Jan 2020 22:18:21 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Richard Guy Briggs <rgb@...hat.com>
Cc:     Linux-Audit Mailing List <linux-audit@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        netfilter-devel@...r.kernel.org, sgrubb@...hat.com,
        omosnace@...hat.com, fw@...len.de, twoerner@...hat.com,
        Eric Paris <eparis@...isplace.org>, ebiederm@...ssion.com,
        tgraf@...radead.org
Subject: Re: [PATCH ghak25 v2 7/9] netfilter: ebtables audit table registration

On Mon, Jan 6, 2020 at 1:56 PM Richard Guy Briggs <rgb@...hat.com> wrote:
>
> Generate audit NETFILTER_CFG records on ebtables table registration.
>
> Previously this was only being done for all x_tables operations and
> ebtables table replacement.
>
> Call new audit_nf_cfg() to store table parameters for later use with
> syscall records.
>
> Here is a sample accompanied record:
>   type=NETFILTER_CFG msg=audit(1494907217.558:5403): table=filter family=7 entries=0

Wait a minute ... in patch 4 you have code that explicitly checks for
"entries=0" and doesn't generate a record in that case; is the example
a lie or is the code a lie? ;)

> See: https://github.com/linux-audit/audit-kernel/issues/43
> Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> ---
>  net/bridge/netfilter/ebtables.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
> index 57dc11c0f349..58126547b175 100644
> --- a/net/bridge/netfilter/ebtables.c
> +++ b/net/bridge/netfilter/ebtables.c
> @@ -1219,6 +1219,8 @@ int ebt_register_table(struct net *net, const struct ebt_table *input_table,
>                 *res = NULL;
>         }
>
> +       if (audit_enabled)
> +               audit_nf_cfg(repl->name, AF_BRIDGE, repl->nentries);
>         return ret;
>  free_unlock:
>         mutex_unlock(&ebt_mutex);
> --
> 1.8.3.1

--
paul moore
www.paul-moore.com