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using System;
using System.IO;
using Org.BouncyCastle.Tls.Crypto;
namespace Org.BouncyCastle.Tls
{
/// <summary>Base class for a TLS client or server.</summary>
public abstract class AbstractTlsPeer
: TlsPeer
{
private readonly TlsCrypto m_crypto;
private volatile TlsCloseable m_closeHandle;
protected AbstractTlsPeer(TlsCrypto crypto)
{
this.m_crypto = crypto;
}
/// <summary>Get the <see cref="ProtocolVersion"/> values that are supported by this peer.</summary>
/// <remarks>
/// WARNING: Mixing DTLS and TLS versions in the returned array is currently NOT supported. Use a separate
/// (sub-)class for each case.
/// </remarks>
/// <returns>an array of supported <see cref="ProtocolVersion"/> values.</returns>
protected virtual ProtocolVersion[] GetSupportedVersions()
{
// TODO[tls13] Enable TLSv13 by default in due course
return ProtocolVersion.TLSv12.DownTo(ProtocolVersion.TLSv10);
}
protected abstract int[] GetSupportedCipherSuites();
/// <exception cref="IOException"/>
public virtual void Cancel()
{
TlsCloseable closeHandle = this.m_closeHandle;
if (null != closeHandle)
{
closeHandle.Close();
}
}
public virtual TlsCrypto Crypto
{
get { return m_crypto; }
}
public virtual void NotifyCloseHandle(TlsCloseable closeHandle)
{
this.m_closeHandle = closeHandle;
}
public abstract ProtocolVersion[] GetProtocolVersions();
public abstract int[] GetCipherSuites();
/// <exception cref="IOException"/>
public virtual void NotifyHandshakeBeginning()
{
}
public virtual int GetHandshakeTimeoutMillis()
{
return 0;
}
public virtual bool AllowLegacyResumption()
{
return false;
}
public virtual int GetMaxCertificateChainLength()
{
return 10;
}
public virtual int GetMaxHandshakeMessageSize()
{
return 32768;
}
public virtual short[] GetPskKeyExchangeModes()
{
return new short[]{ PskKeyExchangeMode.psk_dhe_ke };
}
public virtual bool RequiresCloseNotify()
{
return true;
}
public virtual bool RequiresExtendedMasterSecret()
{
return false;
}
public virtual bool ShouldCheckSigAlgOfPeerCerts()
{
return true;
}
public virtual bool ShouldUseExtendedMasterSecret()
{
return true;
}
public virtual bool ShouldUseExtendedPadding()
{
return false;
}
public virtual bool ShouldUseGmtUnixTime()
{
/*
* draft-mathewson-no-gmtunixtime-00 2. For the reasons we discuss above, we recommend that
* TLS implementors MUST by default set the entire value the ClientHello.Random and
* ServerHello.Random fields, including gmt_unix_time, to a cryptographically random
* sequence.
*/
return false;
}
/// <exception cref="IOException"/>
public virtual void NotifySecureRenegotiation(bool secureRenegotiation)
{
if (!secureRenegotiation)
throw new TlsFatalAlert(AlertDescription.handshake_failure);
}
/// <exception cref="IOException"/>
public virtual TlsKeyExchangeFactory GetKeyExchangeFactory()
{
return new DefaultTlsKeyExchangeFactory();
}
public virtual void NotifyAlertRaised(short alertLevel, short alertDescription, string message,
Exception cause)
{
}
public virtual void NotifyAlertReceived(short alertLevel, short alertDescription)
{
}
/// <exception cref="IOException"/>
public virtual void NotifyHandshakeComplete()
{
}
public virtual TlsHeartbeat GetHeartbeat()
{
return null;
}
public virtual short GetHeartbeatPolicy()
{
return HeartbeatMode.peer_not_allowed_to_send;
}
}
}
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