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-rw-r--r--security/selinux/xfrm.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index b2af7ca496c1..dfab6c886698 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -225,6 +225,74 @@ void selinux_xfrm_state_free(struct xfrm_state *x)
}
/*
+ * SELinux internal function to retrieve the context of a connected
+ * (sk->sk_state == TCP_ESTABLISHED) TCP socket based on its security
+ * association used to connect to the remote socket.
+ *
+ * Retrieve via getsockopt SO_PEERSEC.
+ */
+u32 selinux_socket_getpeer_stream(struct sock *sk)
+{
+ struct dst_entry *dst, *dst_test;
+ u32 peer_sid = SECSID_NULL;
+
+ if (sk->sk_state != TCP_ESTABLISHED)
+ goto out;
+
+ dst = sk_dst_get(sk);
+ if (!dst)
+ goto out;
+
+ for (dst_test = dst; dst_test != 0;
+ dst_test = dst_test->child) {
+ struct xfrm_state *x = dst_test->xfrm;
+
+ if (x && selinux_authorizable_xfrm(x)) {
+ struct xfrm_sec_ctx *ctx = x->security;
+ peer_sid = ctx->ctx_sid;
+ break;
+ }
+ }
+ dst_release(dst);
+
+out:
+ return peer_sid;
+}
+
+/*
+ * SELinux internal function to retrieve the context of a UDP packet
+ * based on its security association used to connect to the remote socket.
+ *
+ * Retrieve via setsockopt IP_PASSSEC and recvmsg with control message
+ * type SCM_SECURITY.
+ */
+u32 selinux_socket_getpeer_dgram(struct sk_buff *skb)
+{
+ struct sec_path *sp;
+
+ if (skb == NULL)
+ return SECSID_NULL;
+
+ if (skb->sk->sk_protocol != IPPROTO_UDP)
+ return SECSID_NULL;
+
+ sp = skb->sp;
+ if (sp) {
+ int i;
+
+ for (i = sp->len-1; i >= 0; i--) {
+ struct xfrm_state *x = sp->x[i].xvec;
+ if (selinux_authorizable_xfrm(x)) {
+ struct xfrm_sec_ctx *ctx = x->security;
+ return ctx->ctx_sid;
+ }
+ }
+ }
+
+ return SECSID_NULL;
+}
+
+/*
* LSM hook that controls access to unlabelled packets. If
* a xfrm_state is authorizable (defined by macro) then it was
* already authorized by the IPSec process. If not, then
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