linux-kernel - [PATCH ghak25 v2 4/9] audit: record nfcfg params

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Date:   Mon,  6 Jan 2020 13:54:05 -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 4/9] audit: record nfcfg params

Record the auditable parameters of any non-empty netfilter table
configuration change.

See: https://github.com/linux-audit/audit-kernel/issues/25
Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
---
 include/linux/audit.h | 11 +++++++++++
 kernel/auditsc.c      | 16 ++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index f9ceae57ca8d..96cabb095eed 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -379,6 +379,7 @@ extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
 extern void __audit_fanotify(unsigned int response);
 extern void __audit_tk_injoffset(struct timespec64 offset);
 extern void __audit_ntp_log(const struct audit_ntp_data *ad);
+extern void __audit_nf_cfg(const char *name, u8 af, int nentries);
 
 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 {
@@ -514,6 +515,12 @@ static inline void audit_ntp_log(const struct audit_ntp_data *ad)
 		__audit_ntp_log(ad);
 }
 
+static inline void audit_nf_cfg(const char *name, u8 af, int nentries)
+{
+	if (!audit_dummy_context())
+		__audit_nf_cfg(name, af, nentries);
+}
+
 extern int audit_n_rules;
 extern int audit_signals;
 #else /* CONFIG_AUDITSYSCALL */
@@ -646,6 +653,10 @@ static inline void audit_ntp_log(const struct audit_ntp_data *ad)
 
 static inline void audit_ptrace(struct task_struct *t)
 { }
+
+static inline void audit_nf_cfg(const char *name, u8 af, int nentries)
+{ }
+
 #define audit_n_rules 0
 #define audit_signals 0
 #endif /* CONFIG_AUDITSYSCALL */
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 4effe01ebbe2..4e1df4233cd3 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2545,6 +2545,22 @@ void __audit_ntp_log(const struct audit_ntp_data *ad)
 	audit_log_ntp_val(ad, "adjust",	AUDIT_NTP_ADJUST);
 }
 
+void __audit_nf_cfg(const char *name, u8 af, int nentries)
+{
+	struct audit_buffer *ab;
+	struct audit_context *context = audit_context();
+
+	if (!nentries)
+		return;
+	ab = audit_log_start(context, GFP_KERNEL, AUDIT_NETFILTER_CFG);
+	if (!ab)
+		return;	/* audit_panic or being filtered */
+	audit_log_format(ab, "table=%s family=%u entries=%u",
+			 name, af, nentries);
+	audit_log_end(ab);
+}
+EXPORT_SYMBOL_GPL(__audit_nf_cfg);
+
 static void audit_log_task(struct audit_buffer *ab)
 {
 	kuid_t auid, uid;
-- 
1.8.3.1