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Subject[RFC PATCH ghak90 (was ghak32) V3 08/10] audit: NETFILTER_PKT: record each container ID associated with a netNS
Date
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@redhat.com>
---
include/linux/audit.h | 5 +++++
kernel/audit.c | 20 +++++++++++++++++++-
kernel/auditsc.c | 2 ++
net/netfilter/xt_AUDIT.c | 12 ++++++++++--
4 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 7e2e51c..4560a4e 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -167,6 +167,8 @@ extern int audit_log_contid(struct audit_context *context,
extern void audit_contid_add(struct net *net, u64 contid);
extern void audit_contid_del(struct net *net, u64 contid);
extern void audit_switch_task_namespaces(struct nsproxy *ns, struct task_struct *p);
+extern void audit_log_contid_list(struct net *net,
+ struct audit_context *context);

extern int audit_update_lsm_rules(void);

@@ -231,6 +233,9 @@ static inline void audit_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_contid_list(struct net *net,
+ struct audit_context *context)
+{ }

#define audit_enabled 0
#endif /* CONFIG_AUDIT */
diff --git a/kernel/audit.c b/kernel/audit.c
index ecd2de4..8cca41a 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -382,6 +382,20 @@ void audit_switch_task_namespaces(struct nsproxy *ns, struct task_struct *p)
audit_contid_add(new->net_ns, contid);
}

+void audit_log_contid_list(struct net *net, struct audit_context *context)
+{
+ struct audit_contid *cont;
+ int i = 0;
+
+ list_for_each_entry(cont, audit_get_contid_list(net), list) {
+ char buf[14];
+
+ sprintf(buf, "net%u", i++);
+ audit_log_contid(context, buf, cont->id);
+ }
+}
+EXPORT_SYMBOL(audit_log_contid_list);
+
void audit_panic(const char *message)
{
switch (audit_failure) {
@@ -2132,17 +2146,21 @@ int audit_log_contid(struct audit_context *context,
char *op, u64 contid)
{
struct audit_buffer *ab;
+ gfp_t gfpflags;

if (!cid_valid(contid))
return 0;
+ /* We can be called in atomic context via audit_tg() */
+ gfpflags = (in_atomic() || irqs_disabled()) ? GFP_ATOMIC : GFP_KERNEL;
/* Generate AUDIT_CONTAINER record with container ID */
- ab = audit_log_start(context, GFP_KERNEL, AUDIT_CONTAINER);
+ ab = audit_log_start(context, gfpflags, AUDIT_CONTAINER);
if (!ab)
return -ENOMEM;
audit_log_format(ab, "op=%s contid=%llu", op, contid);
audit_log_end(ab);
return 0;
}
+EXPORT_SYMBOL(audit_log_contid);

void audit_log_key(struct audit_buffer *ab, char *key)
{
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 6ab5e5e..e2a16d2 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1015,6 +1015,7 @@ struct audit_context *audit_alloc_local(void)
context->in_syscall = 1;
return context;
}
+EXPORT_SYMBOL(audit_alloc_local);

void audit_free_context(struct audit_context *context)
{
@@ -1029,6 +1030,7 @@ 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 f368ee6..10d2707 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 == 0)
- goto errout;
- ab = audit_log_start(NULL, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
+ goto out;
+ context = audit_alloc_local();
+ ab = audit_log_start(context, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
if (ab == NULL)
goto errout;

@@ -104,7 +107,12 @@ static bool audit_ip6(struct audit_buffer *ab, struct sk_buff *skb)

audit_log_end(ab);

+ net = xt_net(par);
+ audit_log_contid_list(net, context);
+
errout:
+ audit_free_context(context);
+out:
return XT_CONTINUE;
}

--
1.8.3.1
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