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

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Message-Id: <65974a7254dffe53b5084bedfd60c95a29a41e08.1577830902.git.rgb@redhat.com>
Date:   Mon,  6 Jan 2020 13:54:10 -0500
From:   Richard Guy Briggs <rgb@...hat.com>
To:     Linux-Audit Mailing List <linux-audit@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        netfilter-devel@...r.kernel.org
Cc:     Paul Moore <paul@...l-moore.com>, sgrubb@...hat.com,
        omosnace@...hat.com, fw@...len.de, twoerner@...hat.com,
        eparis@...isplace.org, ebiederm@...ssion.com, tgraf@...radead.org,
        Richard Guy Briggs <rgb@...hat.com>
Subject: [PATCH ghak25 v2 9/9] netfilter: audit table unregister actions

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(-)

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