BuiltInPermissionSets.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / BuiltInPermissionSets.cs / 1305376 / BuiltInPermissionSets.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
//
// [....] 
// 

using System; 
using System.Diagnostics.Contracts;
using System.Security.Permissions;
using Microsoft.Win32;
 
namespace System.Security
{ 
    internal static class BuiltInPermissionSets 
    {
        // 
        // Raw PermissionSet XML - the built in permission sets are expressed in XML form since they contain
        // permissions from assemblies other than mscorlib.
        //
 
        private static readonly string s_everythingXml =
            @"
                   
                   
                  
                   
                   
                  
                   
                   
                  
                   
                   
                  
                   
                   
                  
                   
                   
                  
                   
               "; 

        private static readonly string s_executionXml = 
            @" 
                   
               ";
 
        private static readonly string s_fullTrustXml =
            @""; 
 
        private static readonly string s_internetXml =
            @"
                   
                   
                   
                   
                  
               ";
 
        private static readonly string s_localIntranetXml =
            @" 
                  
                   
                   
                  
                   
                  
                   
                   
                  
               "; 

        private static readonly string s_nothingXml = 
            @"";

        private static readonly string s_skipVerificationXml =
            @" 
                  
               ";

#if FEATURE_CAS_POLICY 
        private const string s_wpfExtensionXml =
            @" 
                  
                   
              ";
 
        private const string s_wpfExtensionUnrestrictedXml = 
            @" 
                  
                   
              "; 
#endif //FEATURE_CAS_POLICY
 
        //
        // Built in permission set objects
        //
 
        private static NamedPermissionSet s_everything;
        private static NamedPermissionSet s_execution; 
        private static NamedPermissionSet s_fullTrust; 
        private static NamedPermissionSet s_internet;
        private static NamedPermissionSet s_localIntranet; 
        private static NamedPermissionSet s_nothing;
        private static NamedPermissionSet s_skipVerification;

        // 
        // Standard permission sets
        // 
 
        internal static NamedPermissionSet Everything
        { 
            get { return GetOrDeserializeExtendablePermissionSet(ref s_everything, s_everythingXml
#if FEATURE_CAS_POLICY
                     , s_wpfExtensionUnrestrictedXml
#endif // FEATURE_CAS_POLICY 
                     ); }
        } 
 
        internal static NamedPermissionSet Execution
        { 
            get { return GetOrDeserializePermissionSet(ref s_execution, s_executionXml); }
        }

        internal static NamedPermissionSet FullTrust 
        {
            get { return GetOrDeserializePermissionSet(ref s_fullTrust, s_fullTrustXml); } 
        } 

        internal static NamedPermissionSet Internet 
        {
            get { return GetOrDeserializeExtendablePermissionSet(ref s_internet, s_internetXml
#if FEATURE_CAS_POLICY
                     , s_wpfExtensionXml 
#endif // FEATURE_CAS_POLICY
                     ); } 
        } 

        internal static NamedPermissionSet LocalIntranet 
        {
            get { return GetOrDeserializeExtendablePermissionSet(ref s_localIntranet, s_localIntranetXml
#if FEATURE_CAS_POLICY
                     , s_wpfExtensionXml 
#endif // FEATURE_CAS_POLICY
                     ); } 
        } 

        internal static NamedPermissionSet Nothing 
        {
            get { return GetOrDeserializePermissionSet(ref s_nothing, s_nothingXml); }
        }
 
        internal static NamedPermissionSet SkipVerification
        { 
            get { return GetOrDeserializePermissionSet(ref s_skipVerification, s_skipVerificationXml); } 
        }
 
        //
        // Utility methods to construct the permission set objects from the well known XML and any permission
        // set extensions if necessary
        // 

        private static NamedPermissionSet GetOrDeserializeExtendablePermissionSet(ref NamedPermissionSet permissionSet, 
                                                                                  string permissionSetXml 
#if FEATURE_CAS_POLICY
                                                                                  ,string extensionXml 
#endif // FEATURE_CAS_POLICY
                                                                                  )
        {
            Contract.Requires(!String.IsNullOrEmpty(permissionSetXml)); 
#if FEATURE_CAS_POLICY
            Contract.Requires(!String.IsNullOrEmpty(extensionXml)); 
#endif // FEATURE_CAS_POLICY 

            if (permissionSet == null) 
            {
#if FEATURE_CAS_POLICY
                SecurityElement securityElement = SecurityElement.FromString(permissionSetXml);
                NamedPermissionSet deserializedPermissionSet = new NamedPermissionSet(securityElement); 

                PermissionSet extensions = GetPermissionSetExtensions(extensionXml); 
                deserializedPermissionSet.InplaceUnion(extensions); 

                permissionSet = deserializedPermissionSet; 
#endif // FEATURE_CAS_POLICY
            }

            return permissionSet.Copy() as NamedPermissionSet; 
        }
 
        private static NamedPermissionSet GetOrDeserializePermissionSet(ref NamedPermissionSet permissionSet, 
                                                                        string permissionSetXml)
        { 
            Contract.Assert(!String.IsNullOrEmpty(permissionSetXml));

#if FEATURE_CAS_POLICY
            if (permissionSet == null) 
            {
                SecurityElement securityElement = SecurityElement.FromString(permissionSetXml); 
                NamedPermissionSet deserializedPermissionSet = new NamedPermissionSet(securityElement); 

                permissionSet = deserializedPermissionSet; 
            }
#endif // FEATURE_CAS_POLICY

            return permissionSet.Copy() as NamedPermissionSet; 
        }
 
#if FEATURE_CAS_POLICY 
        private static PermissionSet GetPermissionSetExtensions(string extensionXml)
        { 
            Contract.Requires(!String.IsNullOrEmpty(extensionXml));

            SecurityElement se = SecurityElement.FromString(extensionXml);
 
            // Return the permission set extension only if WPF is in the present framework profile.
            // XMLUtil.GetClassFromElement() helps do the quickest check, with no exception thrown and 
            // minimal parsing. 
            SecurityElement firstPermission = (SecurityElement)se.Children[0];
            if (System.Security.Util.XMLUtil.GetClassFromElement(firstPermission, /*ignoreTypeLoadFailures*/true) != null) 
            {
                PermissionSet extensions = new NamedPermissionSet(se);
                return extensions;
            } 

            return null; 
        } 
#endif // FEATURE_CAS_POLICY
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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BuiltInPermissionSets.cs source code in C# .NET

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