diff --git a/vendor/gopkg.in/jcmturner/rpc.v1/mstypes/kerb_sid_and_attributes.go b/vendor/gopkg.in/jcmturner/rpc.v1/mstypes/kerb_sid_and_attributes.go
new file mode 100644
index 0000000..61ac39b
--- /dev/null
+++ b/vendor/gopkg.in/jcmturner/rpc.v1/mstypes/kerb_sid_and_attributes.go
@@ -0,0 +1,23 @@
+package mstypes
+
+// Attributes of a security group membership and can be combined by using the bitwise OR operation.
+// They are used by an access check mechanism to specify whether the membership is to be used in an access check decision.
+const (
+	SEGroupMandatory        = 31
+	SEGroupEnabledByDefault = 30
+	SEGroupEnabled          = 29
+	SEGroupOwner            = 28
+	SEGroupResource         = 2
+	//All other bits MUST be set to zero and MUST be  ignored on receipt.
+)
+
+// KerbSidAndAttributes implements https://msdn.microsoft.com/en-us/library/cc237947.aspx
+type KerbSidAndAttributes struct {
+	SID        RPCSID `ndr:"pointer"` // A pointer to an RPC_SID structure.
+	Attributes uint32
+}
+
+// SetFlag sets a flag in a uint32 attribute value.
+func SetFlag(a *uint32, i uint) {
+	*a = *a | (1 << (31 - i))
+}