public void HandleAsClient()
{
using (ReaderWriter rw = new ReaderWriter(_Connection.Stream))
{
//Read server authenticators
ushort count = rw.ReadUShort();
var authenticators = new string[count];
for (ushort i = 0; i < count; i++)
{
authenticators[i] = rw.ReadString();
}
//Select the best authenticator
//TODO Authenticator select
Type authType = Type.GetType(authenticators[0], false, false);
object authInstance = null;
try { authInstance = Activator.CreateInstance(authType); }
catch (Exception ex)
{
rw.Write(ushort.MaxValue);
throw new SecurityException("Authenticator construction failed", ex);
}
rw.Write((ushort)0); //Selected index
var auth = (Authenticator)authInstance;
//Read challenge
byte[] challenge = rw.ReadBytes();
//Send response
byte[] response = auth.ClientCreateResponse(_Connection.EndPoint, challenge);
//Check result
bool success = rw.ReadBool();
if (success)
{
HandleAuthenticatedConnection();
}
else
{
throw new SecurityException("Authentication failed");
}
}
}
public void HandleAsServer()
{
using (ReaderWriter rw = new ReaderWriter(_Connection.Stream))
{
//Send client all authenticators
rw.Write((ushort)_Authenticators.Count);
foreach (Authenticator av_auth in _Authenticators)
{
rw.Write(av_auth.GetType().FullName, true);
}
rw.Flush();
//Get wanted authenticator index
ushort index = rw.ReadUShort();
if (index == ushort.MaxValue || index > _Authenticators.Count - 1)
{
throw new SecurityException("Client can not authenticate");
}
Authenticator auth = _Authenticators[index];
//Send challenge
byte[] challenge = auth.ServerCreateChallenge(_Connection.EndPoint);
rw.Write(challenge, true);
//Read response
byte[] response = rw.ReadBytes();
//Send result
bool success = auth.ServerCheckResponse(_Connection.EndPoint, challenge, response);
rw.Write(success);
if (success)
{
HandleAuthenticatedConnection();
}
else
{
throw new SecurityException("Client authentication failed");
}
}
}