[MLSXFRM]: Flow based matching of xfrm policy and state
This implements a seemless mechanism for xfrm policy selection and
state matching based on the flow sid. This also includes the necessary
SELinux enforcement pieces.
Signed-off-by: Venkat Yekkirala <vyekkirala@TrustedCS.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/security.h b/include/linux/security.h
index 4d7fb59..2c4921d 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -31,6 +31,7 @@
#include <linux/msg.h>
#include <linux/sched.h>
#include <linux/key.h>
+#include <linux/xfrm.h>
struct ctl_table;
@@ -825,9 +826,8 @@
* used by the XFRM system.
* @sec_ctx contains the security context information being provided by
* the user-level policy update program (e.g., setkey).
- * Allocate a security structure to the xp->security field.
- * The security field is initialized to NULL when the xfrm_policy is
- * allocated.
+ * Allocate a security structure to the xp->security field; the security
+ * field is initialized to NULL when the xfrm_policy is allocated.
* Return 0 if operation was successful (memory to allocate, legal context)
* @xfrm_policy_clone_security:
* @old contains an existing xfrm_policy in the SPD.
@@ -846,9 +846,14 @@
* Database by the XFRM system.
* @sec_ctx contains the security context information being provided by
* the user-level SA generation program (e.g., setkey or racoon).
- * Allocate a security structure to the x->security field. The
- * security field is initialized to NULL when the xfrm_state is
- * allocated.
+ * @polsec contains the security context information associated with a xfrm
+ * policy rule from which to take the base context. polsec must be NULL
+ * when sec_ctx is specified.
+ * @secid contains the secid from which to take the mls portion of the context.
+ * Allocate a security structure to the x->security field; the security
+ * field is initialized to NULL when the xfrm_state is allocated. Set the
+ * context to correspond to either sec_ctx or polsec, with the mls portion
+ * taken from secid in the latter case.
* Return 0 if operation was successful (memory to allocate, legal context).
* @xfrm_state_free_security:
* @x contains the xfrm_state.
@@ -859,13 +864,26 @@
* @xfrm_policy_lookup:
* @xp contains the xfrm_policy for which the access control is being
* checked.
- * @sk_sid contains the sock security label that is used to authorize
+ * @fl_secid contains the flow security label that is used to authorize
* access to the policy xp.
* @dir contains the direction of the flow (input or output).
- * Check permission when a sock selects a xfrm_policy for processing
+ * Check permission when a flow selects a xfrm_policy for processing
* XFRMs on a packet. The hook is called when selecting either a
* per-socket policy or a generic xfrm policy.
* Return 0 if permission is granted.
+ * @xfrm_state_pol_flow_match:
+ * @x contains the state to match.
+ * @xp contains the policy to check for a match.
+ * @fl contains the flow to check for a match.
+ * Return 1 if there is a match.
+ * @xfrm_flow_state_match:
+ * @fl contains the flow key to match.
+ * @xfrm points to the xfrm_state to match.
+ * Return 1 if there is a match.
+ * @xfrm_decode_session:
+ * @skb points to skb to decode.
+ * @fl points to the flow key to set.
+ * Return 0 if successful decoding.
*
* Security hooks affecting all Key Management operations
*
@@ -1343,10 +1361,16 @@
int (*xfrm_policy_clone_security) (struct xfrm_policy *old, struct xfrm_policy *new);
void (*xfrm_policy_free_security) (struct xfrm_policy *xp);
int (*xfrm_policy_delete_security) (struct xfrm_policy *xp);
- int (*xfrm_state_alloc_security) (struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx);
+ int (*xfrm_state_alloc_security) (struct xfrm_state *x,
+ struct xfrm_user_sec_ctx *sec_ctx, struct xfrm_sec_ctx *polsec,
+ u32 secid);
void (*xfrm_state_free_security) (struct xfrm_state *x);
int (*xfrm_state_delete_security) (struct xfrm_state *x);
- int (*xfrm_policy_lookup)(struct xfrm_policy *xp, u32 sk_sid, u8 dir);
+ int (*xfrm_policy_lookup)(struct xfrm_policy *xp, u32 fl_secid, u8 dir);
+ int (*xfrm_state_pol_flow_match)(struct xfrm_state *x,
+ struct xfrm_policy *xp, struct flowi *fl);
+ int (*xfrm_flow_state_match)(struct flowi *fl, struct xfrm_state *xfrm);
+ int (*xfrm_decode_session)(struct sk_buff *skb, struct flowi *fl);
#endif /* CONFIG_SECURITY_NETWORK_XFRM */
/* key management security hooks */
@@ -3050,9 +3074,18 @@
return security_ops->xfrm_policy_delete_security(xp);
}
-static inline int security_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx)
+static inline int security_xfrm_state_alloc(struct xfrm_state *x,
+ struct xfrm_user_sec_ctx *sec_ctx)
{
- return security_ops->xfrm_state_alloc_security(x, sec_ctx);
+ return security_ops->xfrm_state_alloc_security(x, sec_ctx, NULL, 0);
+}
+
+static inline int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
+ struct xfrm_sec_ctx *polsec, u32 secid)
+{
+ if (!polsec)
+ return 0;
+ return security_ops->xfrm_state_alloc_security(x, NULL, polsec, secid);
}
static inline int security_xfrm_state_delete(struct xfrm_state *x)
@@ -3065,9 +3098,25 @@
security_ops->xfrm_state_free_security(x);
}
-static inline int security_xfrm_policy_lookup(struct xfrm_policy *xp, u32 sk_sid, u8 dir)
+static inline int security_xfrm_policy_lookup(struct xfrm_policy *xp, u32 fl_secid, u8 dir)
{
- return security_ops->xfrm_policy_lookup(xp, sk_sid, dir);
+ return security_ops->xfrm_policy_lookup(xp, fl_secid, dir);
+}
+
+static inline int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
+ struct xfrm_policy *xp, struct flowi *fl)
+{
+ return security_ops->xfrm_state_pol_flow_match(x, xp, fl);
+}
+
+static inline int security_xfrm_flow_state_match(struct flowi *fl, struct xfrm_state *xfrm)
+{
+ return security_ops->xfrm_flow_state_match(fl, xfrm);
+}
+
+static inline int security_xfrm_decode_session(struct sk_buff *skb, struct flowi *fl)
+{
+ return security_ops->xfrm_decode_session(skb, fl);
}
#else /* CONFIG_SECURITY_NETWORK_XFRM */
static inline int security_xfrm_policy_alloc(struct xfrm_policy *xp, struct xfrm_user_sec_ctx *sec_ctx)
@@ -3089,7 +3138,14 @@
return 0;
}
-static inline int security_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx)
+static inline int security_xfrm_state_alloc(struct xfrm_state *x,
+ struct xfrm_user_sec_ctx *sec_ctx)
+{
+ return 0;
+}
+
+static inline int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
+ struct xfrm_sec_ctx *polsec, u32 secid)
{
return 0;
}
@@ -3103,10 +3159,28 @@
return 0;
}
-static inline int security_xfrm_policy_lookup(struct xfrm_policy *xp, u32 sk_sid, u8 dir)
+static inline int security_xfrm_policy_lookup(struct xfrm_policy *xp, u32 fl_secid, u8 dir)
{
return 0;
}
+
+static inline int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
+ struct xfrm_policy *xp, struct flowi *fl)
+{
+ return 1;
+}
+
+static inline int security_xfrm_flow_state_match(struct flowi *fl,
+ struct xfrm_state *xfrm)
+{
+ return 1;
+}
+
+static inline int security_xfrm_decode_session(struct sk_buff *skb, struct flowi *fl)
+{
+ return 0;
+}
+
#endif /* CONFIG_SECURITY_NETWORK_XFRM */
#ifdef CONFIG_KEYS