[PATCH ghak90 V7 13/21] audit: NETFILTER_PKT: record each container ID associated with a netNS

[Richard Guy Briggs]

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 <r...@redhat.com>
Acked-by: Neil Horman <nhor...@tuxdriver.com>
Reviewed-by: Ondrej Mosnacek <omosn...@redhat.com>
---
 include/linux/audit.h    |  5 +++++
 kernel/audit.c           | 39 +++++++++++++++++++++++++++++++++++++++
 net/netfilter/nft_log.c  | 11 +++++++++--
 net/netfilter/xt_AUDIT.c | 11 +++++++++--
 4 files changed, 62 insertions(+), 4 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 73e3ab38e3e0..dcd92f964120 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -241,6 +241,8 @@ 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;
 
@@ -328,6 +330,9 @@ 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
 
diff --git a/kernel/audit.c b/kernel/audit.c
index e0c27bc39925..9ce7a1ec7a92 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -450,6 +450,45 @@ 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;
+       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 (!ab) {
+                       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);
+       }
+       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 fe4831f2258f..98d1e7e1a83c 100644
--- a/net/netfilter/nft_log.c
+++ b/net/netfilter/nft_log.c
@@ -66,13 +66,16 @@ 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);
 
@@ -99,6 +102,10 @@ 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 9cdc16b0d0d8..ecf868a1abde 100644
--- a/net/netfilter/xt_AUDIT.c
+++ b/net/netfilter/xt_AUDIT.c
@@ -68,10 +68,13 @@ 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;
 
@@ -101,7 +104,11 @@ 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