SslStream.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / SecureProtocols / SslStream.cs / 1 / SslStream.cs
                        
                        
                            /*++ 
Copyright (c) 2003 Microsoft Corporation

Module Name:
 
    SslStream.cs
 
Abstract: 

    A public implementation of authenticated stream using SSL protocol 

Author:
    Alexei Vopilov    Sept 28-2003
 
Revision History:
 
--*/ 
namespace System.Net.Security {
using System; 
using System.IO;
using System.Threading;
using System.Security.Authentication;
using System.Security.Permissions; 
using System.Security.Principal;
using System.Security.Cryptography.X509Certificates; 
 
    [Flags]
    public enum SslPolicyErrors 
    {
        None                          = 0x0,
        RemoteCertificateNotAvailable = 0x1,
        RemoteCertificateNameMismatch = 0x2, 
        RemoteCertificateChainErrors  = 0x4
    } 
 
    // A user delegate used to verify remote SSL certificate
    public delegate bool RemoteCertificateValidationCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors); 

    // A user delegate used to select local SSL certificate
    public delegate X509Certificate LocalCertificateSelectionCallback(object sender, string targetHost, X509CertificateCollection localCertificates, X509Certificate remoteCertificate, string[] acceptableIssuers);
 
    // Internal versions of the above delegates
    internal delegate bool RemoteCertValidationCallback(string host, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors); 
    internal delegate X509Certificate LocalCertSelectionCallback(string targetHost, X509CertificateCollection localCertificates, X509Certificate remoteCertificate, string[] acceptableIssuers); 
    //
    // 
    //
    public class SslStream: AuthenticatedStream
    {
        private SslState _SslState; 
        private RemoteCertificateValidationCallback _userCertificateValidationCallback;
        private LocalCertificateSelectionCallback   _userCertificateSelectionCallback; 
        private object m_RemoteCertificateOrBytes; 

        public SslStream(Stream innerStream) 
                :this(innerStream, false, null, null)
        {
        }
 
        public SslStream(Stream innerStream, bool leaveInnerStreamOpen)
                :this(innerStream, leaveInnerStreamOpen, null, null) 
        { 
        }
        public SslStream(Stream innerStream, bool leaveInnerStreamOpen, RemoteCertificateValidationCallback userCertificateValidationCallback) 
                :this(innerStream, leaveInnerStreamOpen, userCertificateValidationCallback, null)
        {
        }
        public SslStream(Stream innerStream, bool leaveInnerStreamOpen, RemoteCertificateValidationCallback userCertificateValidationCallback, LocalCertificateSelectionCallback userCertificateSelectionCallback) 
            :base(innerStream, leaveInnerStreamOpen)
        { 
            _userCertificateValidationCallback = userCertificateValidationCallback; 
            _userCertificateSelectionCallback  = userCertificateSelectionCallback;
            RemoteCertValidationCallback _userCertValidationCallbackWrapper = new RemoteCertValidationCallback(userCertValidationCallbackWrapper); 
            LocalCertSelectionCallback   _userCertSelectionCallbackWrapper  = userCertificateSelectionCallback==null  ? null : new LocalCertSelectionCallback(userCertSelectionCallbackWrapper);
            _SslState = new SslState(innerStream, _userCertValidationCallbackWrapper, _userCertSelectionCallbackWrapper);
        }
 
        private bool userCertValidationCallbackWrapper(string hostName, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
        { 
            m_RemoteCertificateOrBytes = certificate == null? null: certificate.GetRawCertData(); 
            if (_userCertificateValidationCallback == null)
            { 
                if (!_SslState.RemoteCertRequired)
                    sslPolicyErrors &= ~SslPolicyErrors.RemoteCertificateNotAvailable;

                return (sslPolicyErrors == SslPolicyErrors.None); 
            }
            else 
                return _userCertificateValidationCallback(this, certificate, chain, sslPolicyErrors); 
        }
 
        private X509Certificate userCertSelectionCallbackWrapper(string targetHost, X509CertificateCollection localCertificates, X509Certificate remoteCertificate, string[] acceptableIssuers)
        {
            return _userCertificateSelectionCallback(this, targetHost, localCertificates, remoteCertificate, acceptableIssuers);
        } 

        // 
        // Client side auth 
        //
        public virtual void AuthenticateAsClient(string targetHost) 
        {
            AuthenticateAsClient(targetHost, new X509CertificateCollection(), SslProtocols.Default, false);
        }
        // 
        public virtual void AuthenticateAsClient(string targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, bool checkCertificateRevocation)
        { 
            _SslState.ValidateCreateContext(false, targetHost, enabledSslProtocols, null, clientCertificates, true, checkCertificateRevocation); 
            _SslState.ProcessAuthentication(null);
        } 
        //


        [HostProtection(ExternalThreading=true)] 
        public virtual IAsyncResult BeginAuthenticateAsClient(string targetHost, AsyncCallback asyncCallback, object asyncState)
        { 
            return BeginAuthenticateAsClient(targetHost, new X509CertificateCollection(), SslProtocols.Default, false, 
                                           asyncCallback, asyncState);
        } 
        //

        [HostProtection(ExternalThreading=true)]
        public virtual IAsyncResult BeginAuthenticateAsClient(string targetHost, X509CertificateCollection clientCertificates, 
                                                            SslProtocols enabledSslProtocols, bool checkCertificateRevocation,
                                                            AsyncCallback asyncCallback, object asyncState) 
        { 
            _SslState.ValidateCreateContext(false, targetHost, enabledSslProtocols, null, clientCertificates, true, checkCertificateRevocation);
 
            LazyAsyncResult result = new LazyAsyncResult(_SslState, asyncState, asyncCallback);
            _SslState.ProcessAuthentication(result);
            return result;
        } 
        //
 
 
        public virtual void EndAuthenticateAsClient(IAsyncResult asyncResult)
        { 
            _SslState.EndProcessAuthentication(asyncResult);
        }
        //
 

        // 
        //server side auth 
        //
        public virtual void AuthenticateAsServer(X509Certificate serverCertificate) 
        {
            AuthenticateAsServer(serverCertificate, false, SslProtocols.Default, false);
        }
        // 
        public virtual void AuthenticateAsServer(X509Certificate serverCertificate, bool clientCertificateRequired,
                                               SslProtocols enabledSslProtocols, bool checkCertificateRevocation) 
        { 
            if (!ComNetOS.IsWin2K) {
                throw new PlatformNotSupportedException(SR.GetString(SR.Win2000Required)); 
            }

            _SslState.ValidateCreateContext(true, string.Empty, enabledSslProtocols, serverCertificate, null, clientCertificateRequired, checkCertificateRevocation);
            _SslState.ProcessAuthentication(null); 
        }
        // 
        [HostProtection(ExternalThreading=true)] 
        public virtual IAsyncResult BeginAuthenticateAsServer(X509Certificate serverCertificate, AsyncCallback asyncCallback, object asyncState)
 
        {

            return BeginAuthenticateAsServer(serverCertificate, false, SslProtocols.Default, false,
                                                          asyncCallback, 
                                                            asyncState);
        } 
        // 
        [HostProtection(ExternalThreading=true)]
        public virtual IAsyncResult BeginAuthenticateAsServer(X509Certificate serverCertificate, bool clientCertificateRequired, 
                                                            SslProtocols enabledSslProtocols, bool checkCertificateRevocation,
                                                            AsyncCallback asyncCallback,
                                                            object asyncState)
        { 
            if (!ComNetOS.IsWin2K) {
                throw new PlatformNotSupportedException(SR.GetString(SR.Win2000Required)); 
            } 

            _SslState.ValidateCreateContext(true, string.Empty, enabledSslProtocols, serverCertificate, null, clientCertificateRequired, checkCertificateRevocation); 
            LazyAsyncResult result = new LazyAsyncResult(_SslState, asyncState, asyncCallback);
            _SslState.ProcessAuthentication(result);
            return result;
        } 
        //
 
        public virtual void EndAuthenticateAsServer(IAsyncResult asyncResult) 
        {
            _SslState.EndProcessAuthentication(asyncResult); 
        }

        //
        // 
        // Base class properties
        // 
        public override bool IsAuthenticated { 
            get {
                return _SslState.IsAuthenticated; 
            }
        }
        //
        public override bool IsMutuallyAuthenticated { 
            get {
                return _SslState.IsMutuallyAuthenticated; 
            } 
        }
        // 
        public override bool IsEncrypted {
            get {
                return  IsAuthenticated;
            } 
        }
        // 
        public override bool IsSigned { 
            get {
                return  IsAuthenticated; 
            }
        }
        //
        public override bool IsServer { 
            get {
                return  _SslState.IsServer; 
            } 
        }
        // 
        //
        //SSL specific properties
        //
        // 
        public virtual SslProtocols SslProtocol {
            get { 
                return _SslState.SslProtocol; 
            }
        } 
        //
        public virtual bool CheckCertRevocationStatus {
            get {
                return _SslState.CheckCertRevocationStatus; 
            }
        } 
        // 
        public virtual X509Certificate LocalCertificate {
            get { 
                return _SslState.LocalCertificate;
            }
        }
        // 
        public virtual X509Certificate RemoteCertificate {
            get { 
                _SslState.CheckThrow(true); 

                object chkCertificateOrBytes = m_RemoteCertificateOrBytes; 
                if (chkCertificateOrBytes != null && chkCertificateOrBytes.GetType() == typeof(byte[]))
                    return (X509Certificate)(m_RemoteCertificateOrBytes = new X509Certificate((byte[]) chkCertificateOrBytes));
                else
                    return chkCertificateOrBytes as X509Certificate; 
            }
        } 
        // 
        // More informational properties
        // 
        public virtual CipherAlgorithmType CipherAlgorithm {
            get {
                return _SslState.CipherAlgorithm;
            } 
        }
        // 
        public virtual int CipherStrength { 
            get {
                return _SslState.CipherStrength; 
            }
        }
        //
        public virtual HashAlgorithmType HashAlgorithm { 
            get {
                return _SslState.HashAlgorithm; 
            } 
        }
        // 
        public virtual int HashStrength {
            get {
                return _SslState.HashStrength;
            } 
        }
        // 
        public virtual ExchangeAlgorithmType KeyExchangeAlgorithm { 
            get {
                return _SslState.KeyExchangeAlgorithm; 
            }
        }
        //
        public virtual int KeyExchangeStrength { 
            get {
                return _SslState.KeyExchangeStrength; 
            } 
        }
        // 
        //
        // Stream contract implementation
        //
        // 
        //
        public override bool CanSeek { 
            get { 
                return false;
            } 
        }
        //
        public override bool CanRead {
            get { 
                return _SslState.IsAuthenticated && InnerStream.CanRead;
            } 
        } 
        //
        public override bool CanTimeout { 
            get {
                return InnerStream.CanTimeout;
            }
        } 
        //
        public override bool CanWrite { 
            get { 
                return _SslState.IsAuthenticated && InnerStream.CanWrite;
            } 
        }
        //
        //
        public override int ReadTimeout { 
            get {
                return InnerStream.ReadTimeout; 
            } 
            set {
                InnerStream.ReadTimeout = value; 
            }
        }
        //
        // 
        public override int WriteTimeout {
            get { 
                return InnerStream.WriteTimeout; 
            }
            set { 
                InnerStream.WriteTimeout = value;
            }
        }
        // 
        public override long Length {
            get { 
                return InnerStream.Length; 
            }
        } 
        //
        public override long Position {
            get {
                return InnerStream.Position; 
            }
            set { 
                throw new NotSupportedException(SR.GetString(SR.net_noseek)); 
            }
        } 
        //
        public override void SetLength(long value) {
            InnerStream.SetLength(value);
        } 
        //
        public override long Seek(long offset, SeekOrigin origin) { 
            throw new NotSupportedException(SR.GetString(SR.net_noseek)); 
        }
        // 
        public override void Flush() {
            _SslState.Flush();
        }
        // 
        //
        protected override void Dispose(bool disposing) { 
            try { 
                _SslState.Close();
            } 
            finally {
                base.Dispose(disposing);
            }
        } 
        //
        public override int Read(byte[] buffer, int offset, int count) { 
            return _SslState.SecureStream.Read(buffer, offset, count); 
        }
 
        //
        public void Write(byte[] buffer) {
            _SslState.SecureStream.Write(buffer, 0, buffer.Length);
        } 

        // 
        public override void Write(byte[] buffer, int offset, int count) { 
            _SslState.SecureStream.Write(buffer, offset, count);
        } 

        //
        [HostProtection(ExternalThreading=true)]
        public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback asyncCallback, object asyncState) { 
            return _SslState.SecureStream.BeginRead(buffer, offset, count, asyncCallback, asyncState);
        } 
 
        //
        public override int EndRead(IAsyncResult asyncResult) { 
            return _SslState.SecureStream.EndRead(asyncResult);
        }

 
        //
        [HostProtection(ExternalThreading=true)] 
        public override IAsyncResult BeginWrite( byte[] buffer, int offset, int count, AsyncCallback asyncCallback, object asyncState) { 
            return _SslState.SecureStream.BeginWrite(buffer, offset, count, asyncCallback, asyncState);
        } 

        //
        public override void EndWrite(IAsyncResult asyncResult) {
            _SslState.SecureStream.EndWrite(asyncResult); 
        }
 
   } 

}
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