[MLSXFRM]: Default labeling of socket specific IPSec policies

This defaults the label of socket-specific IPSec policies to be the
same as the socket they are set on.

Signed-off-by: Venkat Yekkirala <vyekkirala@TrustedCS.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 24 insertions, 12 deletions

diff --git a/security/selinux/include/xfrm.h b/security/selinux/include/xfrm.h
index 8e45c1d588a8..1822c73e5085 100644
--- a/security/selinux/include/xfrm.h
+++ b/security/selinux/include/xfrm.h
@@ -7,7 +7,8 @@
 #ifndef _SELINUX_XFRM_H_
 #define _SELINUX_XFRM_H_
 
-int selinux_xfrm_policy_alloc(struct xfrm_policy *xp, struct xfrm_user_sec_ctx *sec_ctx);
+int selinux_xfrm_policy_alloc(struct xfrm_policy *xp,
+                struct xfrm_user_sec_ctx *sec_ctx, struct sock *sk);
 int selinux_xfrm_policy_clone(struct xfrm_policy *old, struct xfrm_policy *new);
 void selinux_xfrm_policy_free(struct xfrm_policy *xp);
 int selinux_xfrm_policy_delete(struct xfrm_policy *xp);
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index c750ef7af66f..d3690f985135 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -208,10 +208,8 @@ static int selinux_xfrm_sec_ctx_alloc(struct xfrm_sec_ctx **ctxp,
 
         BUG_ON(uctx && pol);
 
-        if (pol)
-                goto from_policy;
-
-        BUG_ON(!uctx);
+        if (!uctx)
+                goto not_from_user;
 
         if (uctx->ctx_doi != XFRM_SC_ALG_SELINUX)
                 return -EINVAL;
@@ -251,11 +249,14 @@ static int selinux_xfrm_sec_ctx_alloc(struct xfrm_sec_ctx **ctxp,
 
         return rc;
 
-from_policy:
-        BUG_ON(!pol);
-        rc = security_sid_mls_copy(pol->ctx_sid, sid, &ctx_sid);
-        if (rc)
-                goto out;
+not_from_user:
+        if (pol) {
+                rc = security_sid_mls_copy(pol->ctx_sid, sid, &ctx_sid);
+                if (rc)
+                        goto out;
+        }
+        else
+                ctx_sid = sid;
 
         rc = security_sid_to_context(ctx_sid, &ctx_str, &str_len);
         if (rc)
@@ -293,13 +294,23 @@ out2:
  * LSM hook implementation that allocs and transfers uctx spec to
  * xfrm_policy.
  */
-int selinux_xfrm_policy_alloc(struct xfrm_policy *xp, struct xfrm_user_sec_ctx *uctx)
+int selinux_xfrm_policy_alloc(struct xfrm_policy *xp,
+                struct xfrm_user_sec_ctx *uctx, struct sock *sk)
 {
         int err;
+        u32 sid;
 
         BUG_ON(!xp);
+        BUG_ON(uctx && sk);
+
+        if (sk) {
+                struct sk_security_struct *ssec = sk->sk_security;
+                sid = ssec->sid;
+        }
+        else
+                sid = SECSID_NULL;
 
-        err = selinux_xfrm_sec_ctx_alloc(&xp->security, uctx, NULL, 0);
+        err = selinux_xfrm_sec_ctx_alloc(&xp->security, uctx, NULL, sid);
         return err;
 }