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Message-ID: <CAFqZXNsV=XFRRqKnkwQqwuVuJ3rtrbS-88__6hKo=igwxE8+vg@mail.gmail.com>
Date: Wed, 27 Mar 2019 23:52:44 +0100
From: Ondrej Mosnacek <omosnace@...hat.com>
To: Richard Guy Briggs <rgb@...hat.com>
Cc: containers@...ts.linux-foundation.org, linux-api@...r.kernel.org,
Linux-Audit Mailing List <linux-audit@...hat.com>,
linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
Paul Moore <paul@...l-moore.com>,
Steve Grubb <sgrubb@...hat.com>,
David Howells <dhowells@...hat.com>,
Simo Sorce <simo@...hat.com>,
Eric Paris <eparis@...isplace.org>,
"Serge E. Hallyn" <serge@...lyn.com>,
"Eric W . Biederman" <ebiederm@...ssion.com>, nhorman@...driver.com
Subject: Re: [PATCH ghak90 V5 10/10] audit: NETFILTER_PKT: record each
container ID associated with a netNS
On Fri, Mar 15, 2019 at 7:35 PM Richard Guy Briggs <rgb@...hat.com> wrote:
> Add audit container identifier auxiliary record(s) to NETFILTER_PKT
> event standalone records. Iterate through all potential audit container
> identifiers associated with a network namespace.
>
> Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
Reviewed-by: Ondrej Mosnacek <omosnace@...hat.com>
(Just note another "%llu"/u64 occurence, in case you plan to add the casts.)
> ---
> include/linux/audit.h | 5 +++++
> kernel/audit.c | 41 +++++++++++++++++++++++++++++++++++++++++
> net/netfilter/nft_log.c | 11 +++++++++--
> net/netfilter/xt_AUDIT.c | 11 +++++++++--
> 4 files changed, 64 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/audit.h b/include/linux/audit.h
> index 70255c2dfb9f..723e2d020228 100644
> --- a/include/linux/audit.h
> +++ b/include/linux/audit.h
> @@ -214,6 +214,8 @@ static inline u64 audit_get_contid(struct task_struct *tsk)
> extern void audit_netns_contid_del(struct net *net, u64 contid);
> extern void audit_switch_task_namespaces(struct nsproxy *ns,
> struct task_struct *p);
> +extern void audit_log_netns_contid_list(struct net *net,
> + struct audit_context *context);
>
> extern u32 audit_enabled;
> #else /* CONFIG_AUDIT */
> @@ -290,6 +292,9 @@ static inline void audit_netns_contid_del(struct net *net, u64 contid)
> static inline void audit_switch_task_namespaces(struct nsproxy *ns,
> struct task_struct *p)
> { }
> +static inline void audit_log_netns_contid_list(struct net *net,
> + struct audit_context *context)
> +{ }
>
> #define audit_enabled AUDIT_OFF
> #endif /* CONFIG_AUDIT */
> diff --git a/kernel/audit.c b/kernel/audit.c
> index 7fa3194f5342..80ed323feeb5 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -451,6 +451,47 @@ void audit_switch_task_namespaces(struct nsproxy *ns, struct task_struct *p)
> audit_netns_contid_add(new->net_ns, contid);
> }
>
> +/**
> + * audit_log_netns_contid_list - List contids for the given network namespace
> + * @net: the network namespace of interest
> + * @context: the audit context to use
> + *
> + * Description:
> + * Issues a CONTAINER_ID record with a CSV list of contids associated
> + * with a network namespace to accompany a NETFILTER_PKT record.
> + */
> +void audit_log_netns_contid_list(struct net *net, struct audit_context *context)
> +{
> + struct audit_buffer *ab = NULL;
> + struct audit_contid *cont;
> + bool first = true;
> + struct audit_net *aunet;
> +
> + /* Generate AUDIT_CONTAINER_ID record with container ID CSV list */
> + rcu_read_lock();
> + aunet = net_generic(net, audit_net_id);
> + if (!aunet)
> + goto out;
> + list_for_each_entry_rcu(cont, &aunet->contid_list, list) {
> + if (first) {
> + ab = audit_log_start(context, GFP_ATOMIC,
> + AUDIT_CONTAINER_ID);
> + if (!ab) {
> + audit_log_lost("out of memory in audit_log_netns_contid_list");
> + goto out;
> + }
> + audit_log_format(ab, "contid=");
> + } else
> + audit_log_format(ab, ",");
> + audit_log_format(ab, "%llu", cont->id);
> + first = false;
> + }
> + audit_log_end(ab);
> +out:
> + rcu_read_unlock();
> +}
> +EXPORT_SYMBOL(audit_log_netns_contid_list);
> +
> void audit_panic(const char *message)
> {
> switch (audit_failure) {
> diff --git a/net/netfilter/nft_log.c b/net/netfilter/nft_log.c
> index 655187bed5d8..bdb1ec2368a7 100644
> --- a/net/netfilter/nft_log.c
> +++ b/net/netfilter/nft_log.c
> @@ -69,13 +69,16 @@ static void nft_log_eval_audit(const struct nft_pktinfo *pkt)
> struct sk_buff *skb = pkt->skb;
> struct audit_buffer *ab;
> int fam = -1;
> + struct audit_context *context;
> + struct net *net;
>
> if (!audit_enabled)
> return;
>
> - ab = audit_log_start(NULL, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
> + context = audit_alloc_local(GFP_ATOMIC);
> + ab = audit_log_start(context, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
> if (!ab)
> - return;
> + goto errout;
>
> audit_log_format(ab, "mark=%#x", skb->mark);
>
> @@ -102,6 +105,10 @@ static void nft_log_eval_audit(const struct nft_pktinfo *pkt)
> audit_log_format(ab, " saddr=? daddr=? proto=-1");
>
> audit_log_end(ab);
> + net = xt_net(&pkt->xt);
> + audit_log_netns_contid_list(net, context);
> +errout:
> + audit_free_context(context);
> }
>
> static void nft_log_eval(const struct nft_expr *expr,
> diff --git a/net/netfilter/xt_AUDIT.c b/net/netfilter/xt_AUDIT.c
> index af883f1b64f9..a3e547435f13 100644
> --- a/net/netfilter/xt_AUDIT.c
> +++ b/net/netfilter/xt_AUDIT.c
> @@ -71,10 +71,13 @@ static bool audit_ip6(struct audit_buffer *ab, struct sk_buff *skb)
> {
> struct audit_buffer *ab;
> int fam = -1;
> + struct audit_context *context;
> + struct net *net;
>
> if (audit_enabled == AUDIT_OFF)
> - goto errout;
> - ab = audit_log_start(NULL, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
> + goto out;
> + context = audit_alloc_local(GFP_ATOMIC);
> + ab = audit_log_start(context, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
> if (ab == NULL)
> goto errout;
>
> @@ -104,7 +107,11 @@ static bool audit_ip6(struct audit_buffer *ab, struct sk_buff *skb)
>
> audit_log_end(ab);
>
> + net = xt_net(par);
> + audit_log_netns_contid_list(net, context);
> errout:
> + audit_free_context(context);
> +out:
> return XT_CONTINUE;
> }
>
> --
> 1.8.3.1
>
--
Ondrej Mosnacek <omosnace at redhat dot com>
Software Engineer, Security Technologies
Red Hat, Inc.
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