PublisherMembershipCondition.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Policy / PublisherMembershipCondition.cs / 1 / PublisherMembershipCondition.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
//  PublisherMembershipCondition.cs
// 
//  Implementation of membership condition for X509 certificate based publishers 
//
 
namespace System.Security.Policy {
    using System;
    using System.Collections;
    using System.Globalization; 
    using System.Security;
    using System.Security.Cryptography.X509Certificates; 
    using System.Security.Policy; 

    [Serializable] 
    [System.Runtime.InteropServices.ComVisible(true)]
    sealed public class PublisherMembershipCondition : IMembershipCondition, IConstantMembershipCondition
    {
        //------------------------------------------------------ 
        //
        // PRIVATE STATE DATA 
        // 
        //-----------------------------------------------------
 
        private X509Certificate m_certificate;
        private SecurityElement m_element;

        //----------------------------------------------------- 
        //
        // PUBLIC CONSTRUCTORS 
        // 
        //-----------------------------------------------------
 
        internal PublisherMembershipCondition()
        {
            m_element = null;
            m_certificate = null; 
        }
 
        public PublisherMembershipCondition( X509Certificate certificate ) 
        {
            CheckCertificate( certificate ); 
            m_certificate = new X509Certificate( certificate );
        }

        private static void CheckCertificate( X509Certificate certificate ) 
        {
            if (certificate == null) 
            { 
                throw new ArgumentNullException( "certificate" );
            } 
        }

        //------------------------------------------------------
        // 
        // PUBLIC ACCESSOR METHODS
        // 
        //----------------------------------------------------- 

        public X509Certificate Certificate 
        {
            set
            {
                CheckCertificate( value ); 
                m_certificate = new X509Certificate( value );
            } 
 
            get
            { 
                if (m_certificate == null && m_element != null)
                    ParseCertificate();

                if (m_certificate != null) 
                    return new X509Certificate( m_certificate );
                else 
                    return null; 
            }
        } 

        public override String ToString()
        {
            if (m_certificate == null && m_element != null) 
                ParseCertificate();
 
            if (m_certificate == null) 
                return Environment.GetResourceString( "Publisher_ToString" );
            else 
            {
                String name = m_certificate.Subject;
                if (name != null)
                    return String.Format( CultureInfo.CurrentCulture, Environment.GetResourceString( "Publisher_ToStringArg" ), System.Security.Util.Hex.EncodeHexString( m_certificate.GetPublicKey() ) ); 
                else
                    return Environment.GetResourceString( "Publisher_ToString" ); 
            } 
        }
 
        //------------------------------------------------------
        //
        // IMEMBERSHIPCONDITION IMPLEMENTATION
        // 
        //------------------------------------------------------
 
        public bool Check( Evidence evidence ) 
        {
            if (evidence == null) 
                return false;

            IEnumerator enumerator = evidence.GetHostEnumerator();
            while (enumerator.MoveNext()) 
            {
                Object obj = enumerator.Current; 
                if (obj is Publisher) 
                {
                    if (m_certificate == null && m_element != null) 
                        ParseCertificate();

                    // We can't just compare certs directly here because Publisher equality
                    // depends only on the keys inside the certs. 
                    if (((Publisher)obj).Equals(new Publisher(m_certificate)))
                        return true; 
                } 
            }
            return false; 
        }

        public IMembershipCondition Copy()
        { 
            if (m_certificate == null && m_element != null)
                ParseCertificate(); 
 
            return new PublisherMembershipCondition( m_certificate );
        } 

        public SecurityElement ToXml()
        {
            return ToXml( null ); 
        }
 
        public void FromXml( SecurityElement e ) 
        {
            FromXml( e, null ); 
        }

        public SecurityElement ToXml( PolicyLevel level )
        { 
            if (m_certificate == null && m_element != null)
                ParseCertificate(); 
 
            SecurityElement root = new SecurityElement( "IMembershipCondition" );
            System.Security.Util.XMLUtil.AddClassAttribute( root, this.GetType(), "System.Security.Policy.PublisherMembershipCondition" ); 
            // If you hit this assert then most likely you are trying to change the name of this class.
            // This is ok as long as you change the hard coded string above and change the assert below.
            BCLDebug.Assert( this.GetType().FullName.Equals( "System.Security.Policy.PublisherMembershipCondition" ), "Class name changed!" );
 
            root.AddAttribute( "version", "1" );
            if (m_certificate != null) 
                root.AddAttribute( "X509Certificate", m_certificate.GetRawCertDataString() ); 

            return root; 
        }

        public void FromXml( SecurityElement e, PolicyLevel level )
        { 
            if (e == null)
                throw new ArgumentNullException("e"); 
 
            if (!e.Tag.Equals( "IMembershipCondition" ))
            { 
                throw new ArgumentException( Environment.GetResourceString( "Argument_MembershipConditionElement" ) );
            }

            lock (this) 
            {
                m_element = e; 
                m_certificate = null; 
            }
        } 

        private void ParseCertificate()
        {
            lock (this) 
            {
                if (m_element == null) 
                    return; 

                String elCert = m_element.Attribute( "X509Certificate" ); 
                m_certificate = elCert == null ? null : new X509Certificate( System.Security.Util.Hex.DecodeHexString( elCert ) );
                CheckCertificate( m_certificate );
                m_element = null;
            } 
        }
 
        public override bool Equals( Object o ) 
        {
            PublisherMembershipCondition that = (o as PublisherMembershipCondition); 
            if (that != null)
            {
                if (this.m_certificate == null && this.m_element != null)
                    this.ParseCertificate(); 
                if (that.m_certificate == null && that.m_element != null)
                    that.ParseCertificate(); 
 
                if ( Publisher.PublicKeyEquals( this.m_certificate, that.m_certificate ))
                    return true; 
            }
            return false;
        }
 
        public override int GetHashCode()
        { 
            if (m_certificate == null && m_element != null) 
                ParseCertificate();
 
            if (m_certificate != null)
                return m_certificate.GetHashCode();
            else
                return typeof( PublisherMembershipCondition ).GetHashCode(); 
        }
    } 
}

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