linux-kernel - Re: [PATCH ghak25 v2 9/9] netfilter: audit table unregister actions

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Message-ID: <CAHC9VhSSxfBLM5gpcmR-4BXctc-iKwvtcuYDkBesVttnWsNmmQ@mail.gmail.com>
Date:   Thu, 30 Jan 2020 22:18:39 -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 9/9] netfilter: audit table unregister actions

On Mon, Jan 6, 2020 at 1:56 PM Richard Guy Briggs <rgb@...hat.com> wrote:
>
> Audit the action of unregistering ebtables and x_tables.
>
> See: https://github.com/linux-audit/audit-kernel/issues/44
> Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> ---
>  kernel/auditsc.c                | 3 ++-
>  net/bridge/netfilter/ebtables.c | 3 +++
>  net/netfilter/x_tables.c        | 4 +++-
>  3 files changed, 8 insertions(+), 2 deletions(-)

... and in keeping with an ongoing theme for this patchset, please
squash this patch too.

> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index 999ac184246b..2644130a9e66 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -2557,7 +2557,8 @@ void __audit_nf_cfg(const char *name, u8 af, int nentries, int op)
>                 return; /* audit_panic or being filtered */
>         audit_log_format(ab, "table=%s family=%u entries=%u op=%s",
>                          name, af, nentries,
> -                        op ? "replace" : "register");
> +                        op == 1 ? "replace" :
> +                                  (op ? "unregister" : "register"));
>         audit_log_end(ab);
>  }
>  EXPORT_SYMBOL_GPL(__audit_nf_cfg);
> diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
> index baff2f05af43..3dd4eb5b13fd 100644
> --- a/net/bridge/netfilter/ebtables.c
> +++ b/net/bridge/netfilter/ebtables.c
> @@ -1126,6 +1126,9 @@ static void __ebt_unregister_table(struct net *net, struct ebt_table *table)
>         mutex_lock(&ebt_mutex);
>         list_del(&table->list);
>         mutex_unlock(&ebt_mutex);
> +       if (audit_enabled)
> +               audit_nf_cfg(table->name, AF_BRIDGE, table->private->nentries,
> +                            2);
>         EBT_ENTRY_ITERATE(table->private->entries, table->private->entries_size,
>                           ebt_cleanup_entry, net, NULL);
>         if (table->private->nentries)
> diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
> index 4ae4f7bf8946..e4852a0cb62f 100644
> --- a/net/netfilter/x_tables.c
> +++ b/net/netfilter/x_tables.c
> @@ -1403,7 +1403,7 @@ struct xt_table_info *xt_replace_table(struct xt_table *table,
>
>         if (audit_enabled)
>                 audit_nf_cfg(table->name, table->af, private->number,
> -                            private->number);
> +                            !!private->number);
>
>         return private;
>  }
> @@ -1466,6 +1466,8 @@ void *xt_unregister_table(struct xt_table *table)
>         private = table->private;
>         list_del(&table->list);
>         mutex_unlock(&xt[table->af].mutex);
> +       if (audit_enabled)
> +               audit_nf_cfg(table->name, table->af, private->number, 2);
>         kfree(table);
>
>         return private;
> --
> 1.8.3.1

--
paul moore
www.paul-moore.com