SELinux: Various xfrm labeling fixes

Since the upstreaming of the mlsxfrm modification a few months back,
testing has resulted in the identification of the following issues/bugs that
are resolved in this patch set.

1. Fix the security context used in the IKE negotiation to be the context
   of the socket as opposed to the context of the SPD rule.

2. Fix SO_PEERSEC for tcp sockets to return the security context of
   the peer as opposed to the source.

3. Fix the selection of an SA for an outgoing packet to be at the same
   context as the originating socket/flow.

The following would be the result of applying this patchset:

- SO_PEERSEC will now correctly return the peer's context.

- IKE deamons will receive the context of the source socket/flow
  as opposed to the SPD rule's context so that the negotiated SA
  will be at the same context as the source socket/flow.

- The SELinux policy will require one or more of the
  following for a socket to be able to communicate with/without SAs:

  1. To enable a socket to communicate without using labeled-IPSec SAs:

     allow socket_t unlabeled_t:association { sendto recvfrom }

  2. To enable a socket to communicate with labeled-IPSec SAs:

     allow socket_t self:association { sendto };
     allow socket_t peer_sa_t:association { recvfrom };

This Patch: Pass correct security context to IKE for use in negotiation

Fix the security context passed to IKE for use in negotiation to be the
context of the socket as opposed to the context of the SPD rule so that
the SA carries the label of the originating socket/flow.

Signed-off-by: Venkat Yekkirala <vyekkirala@TrustedCS.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/security/dummy.c b/security/dummy.c
index 43874c1e6e23..838d8442cf3c 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -836,7 +836,7 @@ static inline void dummy_req_classify_flow(const struct request_sock *req,
 
 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 static int dummy_xfrm_policy_alloc_security(struct xfrm_policy *xp,
-                struct xfrm_user_sec_ctx *sec_ctx, struct sock *sk)
+                struct xfrm_user_sec_ctx *sec_ctx)
 {
         return 0;
 }
@@ -856,7 +856,7 @@ static int dummy_xfrm_policy_delete_security(struct xfrm_policy *xp)
 }
 
 static int dummy_xfrm_state_alloc_security(struct xfrm_state *x,
-        struct xfrm_user_sec_ctx *sec_ctx, struct xfrm_sec_ctx *pol, u32 secid)
+        struct xfrm_user_sec_ctx *sec_ctx, u32 secid)
 {
         return 0;
 }