SELinux: Enable dynamic enable/disable of the network access checks

This patch introduces a mechanism for checking when labeled IPsec or SECMARK
are in use by keeping introducing a configuration reference counter for each
subsystem.  In the case of labeled IPsec, whenever a labeled SA or SPD entry
is created the labeled IPsec/XFRM reference count is increased and when the
entry is removed it is decreased.  In the case of SECMARK, when a SECMARK
target is created the reference count is increased and later decreased when the
target is removed.  These reference counters allow SELinux to quickly determine
if either of these subsystems are enabled.

NetLabel already has a similar mechanism which provides the netlbl_enabled()
function.

This patch also renames the selinux_relabel_packet_permission() function to
selinux_secmark_relabel_packet_permission() as the original name and
description were misleading in that they referenced a single packet label which
is not the case.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>

4 files changed, 83 insertions, 13 deletions

diff --git a/security/selinux/exports.c b/security/selinux/exports.c
index b6f9694..87d2bb3 100644
--- a/security/selinux/exports.c
+++ b/security/selinux/exports.c
@@ -17,10 +17,14 @@
 #include <linux/selinux.h>
 #include <linux/fs.h>
 #include <linux/ipc.h>
+#include <asm/atomic.h>
 
 #include "security.h"
 #include "objsec.h"
 
+/* SECMARK reference count */
+extern atomic_t selinux_secmark_refcount;
+
 int selinux_sid_to_string(u32 sid, char **ctx, u32 *ctxlen)
 {
 	if (selinux_enabled)
@@ -74,7 +78,7 @@ int selinux_string_to_sid(char *str, u32 *sid)
 }
 EXPORT_SYMBOL_GPL(selinux_string_to_sid);
 
-int selinux_relabel_packet_permission(u32 sid)
+int selinux_secmark_relabel_packet_permission(u32 sid)
 {
 	if (selinux_enabled) {
 		struct task_security_struct *tsec = current->security;
@@ -84,4 +88,16 @@ int selinux_relabel_packet_permission(u32 sid)
 	}
 	return 0;
 }
-EXPORT_SYMBOL_GPL(selinux_relabel_packet_permission);
+EXPORT_SYMBOL_GPL(selinux_secmark_relabel_packet_permission);
+
+void selinux_secmark_refcount_inc(void)
+{
+	atomic_inc(&selinux_secmark_refcount);
+}
+EXPORT_SYMBOL_GPL(selinux_secmark_refcount_inc);
+
+void selinux_secmark_refcount_dec(void)
+{
+	atomic_dec(&selinux_secmark_refcount);
+}
+EXPORT_SYMBOL_GPL(selinux_secmark_refcount_dec);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index bfe9a05..6156241 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -51,8 +51,10 @@
 #include <net/ip.h>		/* for local_port_range[] */
 #include <net/tcp.h>		/* struct or_callable used in sock_rcv_skb */
 #include <net/net_namespace.h>
+#include <net/netlabel.h>
 #include <asm/uaccess.h>
 #include <asm/ioctls.h>
+#include <asm/atomic.h>
 #include <linux/bitops.h>
 #include <linux/interrupt.h>
 #include <linux/netdevice.h>	/* for network interface checks */
@@ -91,6 +93,9 @@ extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 extern int selinux_compat_net;
 extern struct security_operations *security_ops;
 
+/* SECMARK reference count */
+atomic_t selinux_secmark_refcount = ATOMIC_INIT(0);
+
 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 int selinux_enforcing = 0;
 
@@ -157,6 +162,21 @@ getsecurity_exit:
 	return len;
 }
 
+/**
+ * selinux_secmark_enabled - Check to see if SECMARK is currently enabled
+ *
+ * Description:
+ * This function checks the SECMARK reference counter to see if any SECMARK
+ * targets are currently configured, if the reference counter is greater than
+ * zero SECMARK is considered to be enabled.  Returns true (1) if SECMARK is
+ * enabled, false (0) if SECMARK is disabled.
+ *
+ */
+static int selinux_secmark_enabled(void)
+{
+	return (atomic_read(&selinux_secmark_refcount) > 0);
+}
+
 /* Allocate and free functions for each kind of security blob. */
 
 static int task_alloc_security(struct task_struct *task)
@@ -3931,7 +3951,6 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
 	struct sk_security_struct *sksec = sk->sk_security;
 	u16 family = sk->sk_family;
 	u32 sk_sid = sksec->sid;
-	u32 peer_sid;
 	struct avc_audit_data ad;
 	char *addrp;
 
@@ -3957,15 +3976,24 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
 		return selinux_sock_rcv_skb_compat(sk, skb, &ad,
 						   family, addrp);
 
-	err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
-			   PACKET__RECV, &ad);
-	if (err)
-		return err;
+	if (selinux_secmark_enabled()) {
+		err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
+				   PACKET__RECV, &ad);
+		if (err)
+			return err;
+	}
 
-	err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
-	if (err)
-		return err;
-	return avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER, PEER__RECV, &ad);
+	if (netlbl_enabled() || selinux_xfrm_enabled()) {
+		u32 peer_sid;
+
+		err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
+		if (err)
+			return err;
+		err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER,
+				   PEER__RECV, &ad);
+	}
+
+	return err;
 }
 
 static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
diff --git a/security/selinux/include/xfrm.h b/security/selinux/include/xfrm.h
index 31929e3..36b0510 100644
--- a/security/selinux/include/xfrm.h
+++ b/security/selinux/include/xfrm.h
@@ -32,6 +32,13 @@ static inline struct inode_security_struct *get_sock_isec(struct sock *sk)
 }
 
 #ifdef CONFIG_SECURITY_NETWORK_XFRM
+extern atomic_t selinux_xfrm_refcount;
+
+static inline int selinux_xfrm_enabled(void)
+{
+	return (atomic_read(&selinux_xfrm_refcount) > 0);
+}
+
 int selinux_xfrm_sock_rcv_skb(u32 sid, struct sk_buff *skb,
 			struct avc_audit_data *ad);
 int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb,
@@ -43,6 +50,11 @@ static inline void selinux_xfrm_notify_policyload(void)
 	atomic_inc(&flow_cache_genid);
 }
 #else
+static inline int selinux_xfrm_enabled(void)
+{
+	return 0;
+}
+
 static inline int selinux_xfrm_sock_rcv_skb(u32 isec_sid, struct sk_buff *skb,
 			struct avc_audit_data *ad)
 {
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index e076039..7e15820 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -46,11 +46,14 @@
 #include <net/checksum.h>
 #include <net/udp.h>
 #include <asm/semaphore.h>
+#include <asm/atomic.h>
 
 #include "avc.h"
 #include "objsec.h"
 #include "xfrm.h"
 
+/* Labeled XFRM instance counter */
+atomic_t selinux_xfrm_refcount = ATOMIC_INIT(0);
 
 /*
  * Returns true if an LSM/SELinux context
@@ -293,6 +296,9 @@ int selinux_xfrm_policy_alloc(struct xfrm_policy *xp,
 	BUG_ON(!uctx);
 
 	err = selinux_xfrm_sec_ctx_alloc(&xp->security, uctx, 0);
+	if (err == 0)
+		atomic_inc(&selinux_xfrm_refcount);
+
 	return err;
 }
 
@@ -340,10 +346,13 @@ int selinux_xfrm_policy_delete(struct xfrm_policy *xp)
 	struct xfrm_sec_ctx *ctx = xp->security;
 	int rc = 0;
 
-	if (ctx)
+	if (ctx) {
 		rc = avc_has_perm(tsec->sid, ctx->ctx_sid,
 				  SECCLASS_ASSOCIATION,
 				  ASSOCIATION__SETCONTEXT, NULL);
+		if (rc == 0)
+			atomic_dec(&selinux_xfrm_refcount);
+	}
 
 	return rc;
 }
@@ -360,6 +369,8 @@ int selinux_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *uct
 	BUG_ON(!x);
 
 	err = selinux_xfrm_sec_ctx_alloc(&x->security, uctx, secid);
+	if (err == 0)
+		atomic_inc(&selinux_xfrm_refcount);
 	return err;
 }
 
@@ -382,10 +393,13 @@ int selinux_xfrm_state_delete(struct xfrm_state *x)
 	struct xfrm_sec_ctx *ctx = x->security;
 	int rc = 0;
 
-	if (ctx)
+	if (ctx) {
 		rc = avc_has_perm(tsec->sid, ctx->ctx_sid,
 				  SECCLASS_ASSOCIATION,
 				  ASSOCIATION__SETCONTEXT, NULL);
+		if (rc == 0)
+			atomic_dec(&selinux_xfrm_refcount);
+	}
 
 	return rc;
 }