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

Mr Dash Four
2011-06-07T10:32:35Z

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