PublisherMembershipCondition.cs source code in C# .NET

                        Code:
                         / FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / clr / src / BCL / System / Security / Policy / PublisherMembershipCondition.cs / 2 / 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, 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" );
            } 
        }

        //------------------------------------------------------
        // 
        // 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; 

            IEnumerator enumerator = evidence.GetHostEnumerator();
            while (enumerator.MoveNext())
            { 
                Publisher publisher = enumerator.Current as Publisher;
                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 assertt 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 assertt 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(); 
        } 
    }
} 

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

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