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// Transport Security Layer (TLS)
// Copyright (c) 2003-2004 Carlos Guzman Alvarez
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Security.Cryptography.X509Certificates;
using Mono.Security.Protocol.Tls;
namespace Mono.Security.Protocol.Tls.Handshake.Client
{
internal class TlsClientCertificate : HandshakeMessage
{
private bool clientCertSelected;
private X509Certificate clientCert;
#region Constructors
public TlsClientCertificate(Context context)
: base(context, HandshakeType.Certificate)
{
}
#endregion
#region Properties
public X509Certificate ClientCertificate {
get {
if (!clientCertSelected)
{
GetClientCertificate ();
clientCertSelected = true;
}
return clientCert;
}
}
#endregion
#region Methods
public override void Update()
{
base.Update();
this.Reset();
}
#endregion
#region Protected Methods
private void GetClientCertificate ()
{
#warning "Client certificate selection is unfinished"
ClientContext context = (ClientContext)this.Context;
// note: the server may ask for mutual authentication
// but may not require it (i.e. it can be optional).
if (context.ClientSettings.Certificates != null &&
context.ClientSettings.Certificates.Count > 0)
{
clientCert = context.SslStream.RaiseClientCertificateSelection(
this.Context.ClientSettings.Certificates,
new X509Certificate(this.Context.ServerSettings.Certificates[0].RawData),
this.Context.ClientSettings.TargetHost,
null);
// Note: the application code can raise it's
// own exception to stop the connection too.
}
// Update the selected client certificate
context.ClientSettings.ClientCertificate = clientCert;
}
private void SendCertificates ()
{
TlsStream chain = new TlsStream ();
X509Certificate currentCert = this.ClientCertificate;
while (currentCert != null) {
byte[] rawCert = currentCert.GetRawCertData ();
chain.WriteInt24 (rawCert.Length);
chain.Write(rawCert);
currentCert = FindParentCertificate (currentCert);
}
this.WriteInt24 ((int)chain.Length);
this.Write (chain.ToArray ());
}
protected override void ProcessAsSsl3()
{
if (this.ClientCertificate != null) {
SendCertificates ();
} else {
// an Alert warning for NoCertificate (41)
// should be sent from here - but that would
// break the current message handling
}
}
protected override void ProcessAsTls1()
{
if (this.ClientCertificate != null) {
SendCertificates ();
} else {
// return message with empty certificate (see 7.4.6 in RFC2246)
this.WriteInt24 (0);
}
}
private X509Certificate FindParentCertificate (X509Certificate cert)
{
// This certificate is the root certificate
if (cert.GetName () == cert.GetIssuerName ())
return null;
foreach (X509Certificate certificate in this.Context.ClientSettings.Certificates) {
if (cert.GetName () == cert.GetIssuerName ())
return certificate;
}
return null;
}
#endregion
}
}
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