PublisherMembershipCondition.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / Policy / PublisherMembershipCondition.cs / 1305376 / 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; 
    using System.Diagnostics.Contracts;

    [Serializable]
    [System.Runtime.InteropServices.ComVisible(true)] 
    sealed public class PublisherMembershipCondition : IMembershipCondition, IConstantMembershipCondition, IReportMatchMembershipCondition
    { 
        //------------------------------------------------------ 
        //
        // 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" );
            }
            Contract.EndContractBlock(); 
        }
 
        //------------------------------------------------------ 
        //
        // 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 )
        {
            object usedEvidence = null; 
            return (this as IReportMatchMembershipCondition).Check(evidence, out usedEvidence);
        } 
 
        bool IReportMatchMembershipCondition.Check(Evidence evidence, out object usedEvidence)
        { 
            usedEvidence = null;

            if (evidence == null)
                return false; 

            Publisher publisher = evidence.GetHostEvidence(); 
            if (publisher != null) 
            {
                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.Equals(new Publisher(m_certificate)))
                { 
                    usedEvidence = publisher; 
                    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.
            Contract.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" ) ); 
            }
            Contract.EndContractBlock(); 
 
            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();
        } 
    }
}

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

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