WindowsPrincipal.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Principal / WindowsPrincipal.cs / 1 / WindowsPrincipal.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 

// 
// WindowsPrincipal.cs 
//
// Group membership checks. 
//

namespace System.Security.Principal
{ 
    using Microsoft.Win32;
    using Microsoft.Win32.SafeHandles; 
    using System.Runtime.InteropServices; 
    using System.Security.Permissions;
    using Hashtable = System.Collections.Hashtable; 

    [Serializable]
    [ComVisible(true)]
    public enum WindowsBuiltInRole { 
        Administrator   = 0x220,
        User            = 0x221, 
        Guest           = 0x222, 
        PowerUser       = 0x223,
        AccountOperator = 0x224, 
        SystemOperator  = 0x225,
        PrintOperator   = 0x226,
        BackupOperator  = 0x227,
        Replicator      = 0x228 
    }
 
    [Serializable()] 
    [HostProtection(SecurityInfrastructure=true)]
    [ComVisible(true)] 
    public class WindowsPrincipal : IPrincipal {
        private WindowsIdentity m_identity = null;

        // Following 3 fields are present purely for serialization compatability with Everett: not used in Whidbey 
#pragma warning disable 169
        private String[] m_roles; 
        private Hashtable m_rolesTable; 
        private bool m_rolesLoaded;
#pragma warning restore 169 

        //
        // Constructors.
        // 

        private WindowsPrincipal () {} 
 
        public WindowsPrincipal (WindowsIdentity ntIdentity) {
            if (ntIdentity == null) 
                throw new ArgumentNullException("ntIdentity");

            m_identity = ntIdentity;
        } 

        // 
        // Properties. 
        //
 
        public virtual IIdentity Identity {
            get {
                return m_identity;
            } 
        }
 
        // 
        // Public methods.
        // 

        public virtual bool IsInRole (string role) {
            if (role == null || role.Length == 0)
                return false; 

            NTAccount ntAccount = new NTAccount(role); 
            IdentityReferenceCollection source = new IdentityReferenceCollection(1); 
            source.Add(ntAccount);
            IdentityReferenceCollection target = NTAccount.Translate(source, typeof(SecurityIdentifier), false); 

            SecurityIdentifier sid = target[0] as SecurityIdentifier;
            if (sid == null)
                return false; 

            return IsInRole(sid); 
        } 

        public virtual bool IsInRole (WindowsBuiltInRole role) { 
            if (role < WindowsBuiltInRole.Administrator || role > WindowsBuiltInRole.Replicator)
                throw new ArgumentException(Environment.GetResourceString("Arg_EnumIllegalVal", (int)role), "role");

            return IsInRole((int) role); 
        }
 
        public virtual bool IsInRole (int rid) { 
            SecurityIdentifier sid = new SecurityIdentifier(IdentifierAuthority.NTAuthority,
                                                            new int[] {Win32Native.SECURITY_BUILTIN_DOMAIN_RID, rid}); 

            return IsInRole(sid);
        }
 
        // This methods (with a SID parameter) is more general than the 2 overloads that accept a WindowsBuiltInRole or
        // a rid (as an int). It is also better from a performance standpoint than the overload that accepts a string. 
        // The aformentioned overloads remain in this class since we do not want to introduce a 
        // breaking change. However, this method should be used in all new applications and we should document this.
 
        [ComVisible(false)]
        public virtual bool IsInRole (SecurityIdentifier sid) {
            if (sid == null)
                throw new ArgumentNullException("sid"); 

            // special case the anonymous identity. 
            if (m_identity.TokenHandle.IsInvalid) 
                return false;
 
            // CheckTokenMembership expects an impersonation token
            SafeTokenHandle token = SafeTokenHandle.InvalidHandle;
            if (m_identity.ImpersonationLevel == TokenImpersonationLevel.None) {
                if (!Win32Native.DuplicateTokenEx(m_identity.TokenHandle, 
                                                  (uint) TokenAccessLevels.Query,
                                                  IntPtr.Zero, 
                                                  (uint) TokenImpersonationLevel.Identification, 
                                                  (uint) TokenType.TokenImpersonation,
                                                  ref token)) 
                    throw new SecurityException(Win32Native.GetMessage(Marshal.GetLastWin32Error()));
            }

            bool isMember = false; 
            // CheckTokenMembership will check if the SID is both present and enabled in the access token.
            if (!Win32Native.CheckTokenMembership((m_identity.ImpersonationLevel != TokenImpersonationLevel.None ? m_identity.TokenHandle : token), 
                                                  sid.BinaryForm, 
                                                  ref isMember))
                throw new SecurityException(Win32Native.GetMessage(Marshal.GetLastWin32Error())); 

            token.Dispose();
            return isMember;
        } 
    }
}

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