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Date: Tue, 16 Apr 2013 16:39:18 -0400
From: Paul Moore <pmoore@...hat.com>
To: netdev@...r.kernel.org, linux-security-module@...r.kernel.org,
selinux@...ho.nsa.gov
Subject: [RFC PATCH 2/3] net: wrap skb->secmark access with set and get
functions
Abstract away direct access to the "secmark" field in the sk_buff
struct via the LSM hooks security_skb_secmark_{get,set}().
Signed-off-by: Paul Moore <pmoore@...hat.com>
---
include/linux/security.h | 20 +++++++++++++++++++-
net/netfilter/xt_CONNSECMARK.c | 10 ++++++----
net/netfilter/xt_SECMARK.c | 2 +-
security/capability.c | 10 ++++++++++
security/security.c | 11 +++++++++++
security/selinux/hooks.c | 22 +++++++++++++++++-----
6 files changed, 64 insertions(+), 11 deletions(-)
diff --git a/include/linux/security.h b/include/linux/security.h
index 032c366..464f123 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1016,6 +1016,13 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* This hook sets the packet's owning sock.
* @skb is the packet.
* @sk the sock which owns the packet.
+ * @skb_secmark_set:
+ * This hook sets the secmark on a packet.
+ * @skb the packet.
+ * @secmark the secmark value.
+ * @skb_secmark_get:
+ * This hook returns the packet's secmark.
+ * @skb the packet.
*
* Security hooks for XFRM operations.
*
@@ -1643,6 +1650,8 @@ struct security_operations {
int (*tun_dev_attach) (struct sock *sk, void *security);
int (*tun_dev_open) (void *security);
void (*skb_owned_by) (struct sk_buff *skb, struct sock *sk);
+ void (*skb_secmark_set) (struct sk_buff *skb, u32 secmark);
+ u32 (*skb_secmark_get) (const struct sk_buff *skb);
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
@@ -2592,8 +2601,9 @@ int security_tun_dev_create(void);
int security_tun_dev_attach_queue(void *security);
int security_tun_dev_attach(struct sock *sk, void *security);
int security_tun_dev_open(void *security);
-
void security_skb_owned_by(struct sk_buff *skb, struct sock *sk);
+void security_skb_secmark_set(struct sk_buff *skb, u32 secmark);
+u32 security_skb_secmark_get(const struct sk_buff *skb);
#else /* CONFIG_SECURITY_NETWORK */
static inline int security_unix_stream_connect(struct sock *sock,
@@ -2791,6 +2801,14 @@ static inline void security_skb_owned_by(struct sk_buff *skb, struct sock *sk)
{
}
+static inline void security_skb_secmark_set(struct sk_buff *skb, u32 secmark)
+{
+}
+
+static inline u32 security_skb_secmark_get(const struct sk_buff *skb)
+{
+ return 0;
+}
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
diff --git a/net/netfilter/xt_CONNSECMARK.c b/net/netfilter/xt_CONNSECMARK.c
index e04dc28..2201c1b 100644
--- a/net/netfilter/xt_CONNSECMARK.c
+++ b/net/netfilter/xt_CONNSECMARK.c
@@ -35,13 +35,15 @@ MODULE_ALIAS("ip6t_CONNSECMARK");
*/
static void secmark_save(const struct sk_buff *skb)
{
- if (skb->secmark) {
+ u32 secmark = security_skb_secmark_get(skb);
+
+ if (secmark) {
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
ct = nf_ct_get(skb, &ctinfo);
if (ct && !ct->secmark) {
- ct->secmark = skb->secmark;
+ ct->secmark = secmark;
nf_conntrack_event_cache(IPCT_SECMARK, ct);
}
}
@@ -53,13 +55,13 @@ static void secmark_save(const struct sk_buff *skb)
*/
static void secmark_restore(struct sk_buff *skb)
{
- if (!skb->secmark) {
+ if (!security_skb_secmark_get(skb)) {
const struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
ct = nf_ct_get(skb, &ctinfo);
if (ct && ct->secmark)
- skb->secmark = ct->secmark;
+ security_skb_secmark_set(skb, ct->secmark);
}
}
diff --git a/net/netfilter/xt_SECMARK.c b/net/netfilter/xt_SECMARK.c
index 9faf5e0..ed20d8e 100644
--- a/net/netfilter/xt_SECMARK.c
+++ b/net/netfilter/xt_SECMARK.c
@@ -45,7 +45,7 @@ secmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
BUG();
}
- skb->secmark = secmark;
+ security_skb_secmark_set(skb, secmark);
return XT_CONTINUE;
}
diff --git a/security/capability.c b/security/capability.c
index 6783c3e..b7c0ef2 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -742,6 +742,14 @@ static void cap_skb_owned_by(struct sk_buff *skb, struct sock *sk)
{
}
+static void cap_skb_secmark_set(struct sk_buff *skb, u32 secmark)
+{
+}
+
+static u32 cap_skb_secmark_get(const struct sk_buff *skb)
+{
+ return 0;
+}
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
@@ -1077,6 +1085,8 @@ void __init security_fixup_ops(struct security_operations *ops)
set_to_cap_if_null(ops, tun_dev_attach_queue);
set_to_cap_if_null(ops, tun_dev_attach);
set_to_cap_if_null(ops, skb_owned_by);
+ set_to_cap_if_null(ops, skb_secmark_set);
+ set_to_cap_if_null(ops, skb_secmark_get);
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
set_to_cap_if_null(ops, xfrm_policy_alloc_security);
diff --git a/security/security.c b/security/security.c
index 03f248b..7e2b7c7 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1295,6 +1295,17 @@ void security_skb_owned_by(struct sk_buff *skb, struct sock *sk)
security_ops->skb_owned_by(skb, sk);
}
+void security_skb_secmark_set(struct sk_buff *skb, u32 secmark)
+{
+ security_ops->skb_secmark_set(skb, secmark);
+}
+EXPORT_SYMBOL(security_skb_secmark_set);
+
+u32 security_skb_secmark_get(const struct sk_buff *skb)
+{
+ return security_ops->skb_secmark_get(skb);
+}
+EXPORT_SYMBOL(security_skb_secmark_get);
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 7171a95..5021cf7 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3473,6 +3473,21 @@ static void selinux_task_to_inode(struct task_struct *p,
isec->initialized = 1;
}
+static void selinux_skb_owned_by(struct sk_buff *skb, struct sock *sk)
+{
+ skb_set_owner_w(skb, sk);
+}
+
+static void selinux_skb_secmark_set(struct sk_buff *skb, u32 secmark)
+{
+ skb->secmark = secmark;
+}
+
+static u32 selinux_skb_secmark_get(const struct sk_buff *skb)
+{
+ return skb->secmark;
+}
+
/* Returns error only if unable to parse addresses */
static int selinux_parse_skb_ipv4(struct sk_buff *skb,
struct common_audit_data *ad, u8 *proto)
@@ -4364,11 +4379,6 @@ static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
}
-static void selinux_skb_owned_by(struct sk_buff *skb, struct sock *sk)
-{
- skb_set_owner_w(skb, sk);
-}
-
static int selinux_secmark_relabel_packet(u32 sid)
{
const struct task_security_struct *__tsec;
@@ -5671,6 +5681,8 @@ static struct security_operations selinux_ops = {
.tun_dev_attach = selinux_tun_dev_attach,
.tun_dev_open = selinux_tun_dev_open,
.skb_owned_by = selinux_skb_owned_by,
+ .skb_secmark_set = selinux_skb_secmark_set,
+ .skb_secmark_get = selinux_skb_secmark_get,
#ifdef CONFIG_SECURITY_NETWORK_XFRM
.xfrm_policy_alloc_security = selinux_xfrm_policy_alloc,
--
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