linux-kernel - [PATCH ghak25 v4 2/3] netfilter: add audit table unregister actions

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Date:   Wed, 22 Apr 2020 17:39:29 -0400
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 v4 2/3] netfilter: add 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>
---
 include/linux/audit.h           | 1 +
 kernel/auditsc.c                | 5 +++--
 net/bridge/netfilter/ebtables.c | 2 ++
 net/netfilter/x_tables.c        | 2 ++
 4 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 5c7f07a9776d..1a2351508211 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -97,6 +97,7 @@ struct audit_ntp_data {
 enum audit_nfcfgop {
 	AUDIT_XT_OP_REGISTER,
 	AUDIT_XT_OP_REPLACE,
+	AUDIT_XT_OP_UNREGISTER,
 };
 
 extern int is_audit_feature_set(int which);
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 705beac0ce29..d281c18d1771 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -136,8 +136,9 @@ struct audit_nfcfgop_tab {
 };
 
 const struct audit_nfcfgop_tab audit_nfcfgs[] = {
-	{ AUDIT_XT_OP_REGISTER,	"register"	},
-	{ AUDIT_XT_OP_REPLACE,	"replace"	},
+	{ AUDIT_XT_OP_REGISTER,		"register"	},
+	{ AUDIT_XT_OP_REPLACE,		"replace"	},
+	{ AUDIT_XT_OP_UNREGISTER,	"unregister"	},
 };
 
 static int audit_match_perm(struct audit_context *ctx, int mask)
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 0a148e68b6e1..4778db5601b0 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1124,6 +1124,8 @@ static void __ebt_unregister_table(struct net *net, struct ebt_table *table)
 	mutex_lock(&ebt_mutex);
 	list_del(&table->list);
 	mutex_unlock(&ebt_mutex);
+	audit_log_nfcfg(table->name, AF_BRIDGE, table->private->nentries,
+			AUDIT_XT_OP_UNREGISTER);
 	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 8f8c5dbf603d..99a468be4a59 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1472,6 +1472,8 @@ void *xt_unregister_table(struct xt_table *table)
 	private = table->private;
 	list_del(&table->list);
 	mutex_unlock(&xt[table->af].mutex);
+	audit_log_nfcfg(table->name, table->af, private->number,
+			AUDIT_XT_OP_UNREGISTER);
 	kfree(table);
 
 	return private;
-- 
1.8.3.1