[PATCH 3rd revision] Add SELinux context support to AUDIT target

[Mr Dash Four <mr.dash.four@googlemail.com>]

Add SELinux context support to AUDIT target - 3rd revision (style-type changes made *only* since 2nd revision of this patch). Typical (raw auditd) output after applying this patch would be:

type=NETFILTER_PKT msg=audit(1305852240.082:31012): action=0 hook=1 len=52 inif=? outif=eth0 saddr=10.1.1.7 daddr=10.1.2.1 ipid=16312 proto=6 sport=56150 dport=22 obj=system_u:object_r:ssh_packet_t:s0
type=NETFILTER_PKT msg=audit(1306772064.079:56): action=0 hook=3 len=48 inif=eth0 outif=? smac=00:05:5d:7c:27:0b dmac=00:02:b3:0a:7f:81 macproto=0x0800 saddr=10.1.2.1 daddr=10.1.1.7 ipid=462 proto=6 sport=3561 dport=22 obj=system_u:object_r:ssh_packet_t:s0

Signed-off-by: Mr Dash Four <mr.dash.four@googlemail.com>
---
 net/netfilter/xt_AUDIT.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/net/netfilter/xt_AUDIT.c b/net/netfilter/xt_AUDIT.c
index 363a99e..26933ef 100644
--- a/net/netfilter/xt_AUDIT.c
+++ b/net/netfilter/xt_AUDIT.c
@@ -20,6 +20,9 @@
 #include <linux/netfilter/x_tables.h>
 #include <linux/netfilter/xt_AUDIT.h>
 #include <linux/netfilter_bridge/ebtables.h>
+#ifdef CONFIG_NF_CONNTRACK_SECMARK
+#include <linux/security.h>
+#endif
 #include <net/ipv6.h>
 #include <net/ip.h>
 
@@ -122,6 +125,10 @@ audit_tg(struct sk_buff *skb, const struct xt_action_param *par)
 {
 	const struct xt_audit_info *info = par->targinfo;
 	struct audit_buffer *ab;
+#ifdef CONFIG_NF_CONNTRACK_SECMARK
+	u32 len;
+	char *secctx;
+#endif
 
 	ab = audit_log_start(NULL, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
 	if (ab == NULL)
@@ -163,6 +170,15 @@ audit_tg(struct sk_buff *skb, const struct xt_action_param *par)
 		break;
 	}
 
+#ifdef CONFIG_NF_CONNTRACK_SECMARK
+	if (skb->secmark) {
+	  	if (!security_secid_to_secctx(skb->secmark, &secctx, &len)) {
+			audit_log_format(ab, " obj=%s", secctx);
+			security_release_secctx(secctx, len);
+		}
+	}
+#endif
+
 	audit_log_end(ab);
 
 errout:
-- 
1.7.3.4