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//
// MonoTlsProvider.cs
//
// Author:
// Martin Baulig <martin.baulig@xamarin.com>
//
// Copyright (c) 2015 Xamarin, Inc.
//
// 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.IO;
using System.Net;
using System.Net.Security;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using Mono.Security.Protocol.Tls;
namespace Mono.Security.Interface
{
/*
* Unfortunately, we can't use the public definitions from System.dll here, so we need to
* copy these.
*
* The @MonoRemoteCertificateValidationCallback also has an additional 'targetHost' argument.
*
*/
[Flags]
public enum MonoSslPolicyErrors
{
None = 0,
RemoteCertificateNotAvailable = 1,
RemoteCertificateNameMismatch = 2,
RemoteCertificateChainErrors = 4,
}
public enum MonoEncryptionPolicy
{
// Prohibit null ciphers (current system defaults)
RequireEncryption = 0,
// Add null ciphers to current system defaults
AllowNoEncryption,
// Request null ciphers only
NoEncryption
}
public delegate bool MonoRemoteCertificateValidationCallback (
string targetHost, X509Certificate certificate, X509Chain chain, MonoSslPolicyErrors sslPolicyErrors);
public delegate X509Certificate MonoLocalCertificateSelectionCallback (
string targetHost, X509CertificateCollection localCertificates, X509Certificate remoteCertificate,
string[] acceptableIssuers);
public abstract class MonoTlsProvider
{
public abstract Guid ID {
get;
}
public abstract string Name {
get;
}
#region SslStream
/*
* This section abstracts the @SslStream class.
*
*/
public abstract bool SupportsSslStream {
get;
}
/*
* Does this provider support IMonoSslStream.GetConnectionInfo() ?
*/
public abstract bool SupportsConnectionInfo {
get;
}
/*
* Whether or not this TLS Provider supports Mono-specific extensions
* (via @MonoTlsSettings).
*/
public abstract bool SupportsMonoExtensions {
get;
}
public abstract SslProtocols SupportedProtocols {
get;
}
/*
* Obtain a @IMonoSslStream instance.
*
*/
public abstract IMonoSslStream CreateSslStream (
Stream innerStream, bool leaveInnerStreamOpen,
MonoTlsSettings settings = null);
#endregion
#region Certificate Validation
/*
* Allows a TLS provider to provide a custom system certificiate validator.
*/
public virtual bool HasCustomSystemCertificateValidator {
get { return false; }
}
/*
* If @serverMode is true, then we're a server and want to validate a certificate
* that we received from a client.
*
* On OS X and Mobile, the @chain will be initialized with the @certificates, but not actually built.
*
* Returns `true` if certificate validation has been performed and `false` to invoke the
* default system validator.
*/
public virtual bool InvokeSystemCertificateValidator (
ICertificateValidator validator, string targetHost, bool serverMode,
X509CertificateCollection certificates, X509Chain chain, out bool success,
ref MonoSslPolicyErrors errors, ref int status11)
{
success = false;
return false;
}
#endregion
#region Manged SSPI
/*
* The managed SSPI implementation from the new TLS code.
*/
public abstract bool SupportsTlsContext {
get;
}
public abstract IMonoTlsContext CreateTlsContext (
string hostname, bool serverMode, TlsProtocols protocolFlags,
X509Certificate serverCertificate, X509CertificateCollection clientCertificates,
bool remoteCertRequired, MonoEncryptionPolicy encryptionPolicy,
MonoTlsSettings settings);
#endregion
}
}
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