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#region Disclaimer / License
// Copyright (C) 2011, Kenneth Skovhede
// http://www.hexad.dk, opensource@hexad.dk
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
#endregion
using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography.X509Certificates;
using System.Net.Security;
namespace Duplicati.Library.Utility
{
public class SslCertificateValidator : IDisposable
{
[Serializable]
public class InvalidCertificateException : Exception
{
private string m_certificate = null;
private SslPolicyErrors m_errors = SslPolicyErrors.None;
public string Certificate { get { return m_certificate; } }
public SslPolicyErrors SslError { get { return m_errors; } }
public InvalidCertificateException(string certificate, SslPolicyErrors error)
: base(string.Format(Strings.SslCertificateValidator.VerifyCertificateException, error, certificate))
{
m_certificate = certificate;
m_errors = error;
}
}
public SslCertificateValidator(bool acceptAll, string[] validHashes)
{
m_acceptAll = acceptAll;
m_validHashes = validHashes;
m_oldCallback = System.Net.ServicePointManager.ServerCertificateValidationCallback;
System.Net.ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(ValidateServerCertficate);
m_isAttached = true;
}
private bool m_acceptAll = false;
private string[] m_validHashes = null;
private bool m_isAttached = false;
private Exception m_uncastException = null;
private RemoteCertificateValidationCallback m_oldCallback = null;
private void Deactivate()
{
if (!m_isAttached)
throw new InvalidOperationException(Strings.SslCertificateValidator.InvalidCallSequence);
System.Net.ServicePointManager.ServerCertificateValidationCallback = m_oldCallback;
m_oldCallback = null;
m_isAttached = false;
if (m_uncastException != null)
{
Exception tmp = m_uncastException;
m_uncastException = null;
throw tmp;
}
}
private bool ValidateServerCertficate(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors sslPolicyErrors)
{
if (sslPolicyErrors == SslPolicyErrors.None)
return true;
if (m_acceptAll)
return true;
string certHash = null;
try
{
certHash = Utility.ByteArrayAsHexString(cert.GetCertHash());
if (certHash != null && m_validHashes != null)
foreach(var hash in m_validHashes)
{
if (!string.IsNullOrEmpty(hash) && certHash.Equals(hash, StringComparison.InvariantCultureIgnoreCase))
return true;
}
}
catch (Exception ex)
{
throw new Exception(string.Format(Strings.SslCertificateValidator.VerifyCertificateHashError, ex, sslPolicyErrors), ex);
}
m_uncastException = new InvalidCertificateException(certHash, sslPolicyErrors);
return false;
}
#region IDisposable Members
public void Dispose()
{
if (m_isAttached)
Deactivate();
}
#endregion
}
}
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