Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/Util/Permission.cs

@@ -0,0 +1,45 @@
+//------------------------------------------------------------------------------
+// <copyright file="Permission.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+/*
+ * 
+ * Copyright (c) 1998-1999, Microsoft Corporation
+ * 
+ */
+
+namespace System.Web.Util {
+    using System.Security.Permissions;
+    using System.Security;
+    using System.Data.SqlClient;
+    
+    static class Permission {
+        internal static bool HasSqlClientPermission() {
+            NamedPermissionSet  permissionset = HttpRuntime.NamedPermissionSet;
+            
+            // If we don't have a NamedPermissionSet, we're in full trust
+            if (permissionset == null)
+                return true;
+
+            // Check that the user has unrestricted SqlClientPermission
+            IPermission allowedPermission = permissionset.GetPermission(typeof(SqlClientPermission));
+
+            if (allowedPermission == null) {
+                return false;
+            }
+            
+            IPermission askedPermission = null;
+            try {
+                askedPermission = new SqlClientPermission(PermissionState.Unrestricted);
+            }
+            catch {
+                return false;
+            }
+            
+            return askedPermission.IsSubsetOf(allowedPermission);
+        }
+        
+    }
+}