Re: [RFC PATCH ghak32 V2 12/13] audit: NETFILTER_PKT: record each container ID associated with a netNS

Paul Moore
2018-04-19T02:10:10Z

On Fri, Mar 16, 2018 at 5:00 AM, Richard Guy Briggs <rgb@redhat.com> wrote:
> Add container ID auxiliary record(s) to NETFILTER_PKT event standalone
> records. Iterate through all potential container IDs associated with a
> network namespace.
>
> Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
> ---
> kernel/audit.c | 1 +
> kernel/auditsc.c | 2 ++
> net/netfilter/xt_AUDIT.c | 15 ++++++++++++++-
> 3 files changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/audit.c b/kernel/audit.c
> index 08662b4..3c77e47 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -2102,6 +2102,7 @@ int audit_log_container_info(struct audit_context *context,
> audit_log_end(ab);
> return 0;
> }
> +EXPORT_SYMBOL(audit_log_container_info);
>
> void audit_log_key(struct audit_buffer *ab, char *key)
> {
> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index 208da962..af68d01 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -975,6 +975,7 @@ struct audit_context *audit_alloc_local(void)
> context->in_syscall = 1;
> return context;
> }
> +EXPORT_SYMBOL(audit_alloc_local);
>
> inline void audit_free_context(struct audit_context *context)
> {
> @@ -989,6 +990,7 @@ inline void audit_free_context(struct audit_context *context)
> audit_proctitle_free(context);
> kfree(context);
> }
> +EXPORT_SYMBOL(audit_free_context);
>
> static int audit_log_pid_context(struct audit_context *context, pid_t pid,
> kuid_t auid, kuid_t uid, unsigned int sessionid,
> diff --git a/net/netfilter/xt_AUDIT.c b/net/netfilter/xt_AUDIT.c
> index c502419..edaa456 100644
> --- a/net/netfilter/xt_AUDIT.c
> +++ b/net/netfilter/xt_AUDIT.c
> @@ -71,10 +71,14 @@ static bool audit_ip6(struct audit_buffer *ab, struct sk_buff *skb)
> {
> struct audit_buffer *ab;
> int fam = -1;
> + struct audit_context *context = audit_alloc_local();
> + struct audit_containerid *cont;
> + int i = 0;
> + struct net *net;
>
> if (audit_enabled == 0)
> goto errout;

Do I need to say it? I probably should ... the allocation should
happen after the audit_enabled check.

> - ab = audit_log_start(NULL, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
> + ab = audit_log_start(context, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
> if (ab == NULL)
> goto errout;
>
> @@ -104,7 +108,16 @@ static bool audit_ip6(struct audit_buffer *ab, struct sk_buff *skb)
>
> audit_log_end(ab);
>
> + net = sock_net(NETLINK_CB(skb).sk);
> + list_for_each_entry(cont, &net->audit_containerid, list) {
> + char buf[14];
> +
> + sprintf(buf, "net%u", i++);
> + audit_log_container_info(context, buf, cont->id);
> + }

It seems like this could (should?) be hidden inside an audit function,
e.g. audit_log_net_containers() or something like that.

> errout:
> + audit_free_context(context);
> return XT_CONTINUE;
> }

--
paul moore