public NTLMScheme(NTLMEngine engine) : base()
{
Args.NotNull(engine, "NTLM engine");
this.engine = engine;
this.state = NTLMScheme.State.Uninitiated;
this.challenge = null;
}
/// <exception cref="Apache.Http.Auth.MalformedChallengeException"></exception>
protected internal override void ParseChallenge(CharArrayBuffer buffer, int beginIndex
, int endIndex)
{
this.challenge = buffer.SubstringTrimmed(beginIndex, endIndex);
if (this.challenge.Length == 0)
{
if (this.state == NTLMScheme.State.Uninitiated)
{
this.state = NTLMScheme.State.ChallengeReceived;
}
else
{
this.state = NTLMScheme.State.Failed;
}
}
else
{
if (this.state.CompareTo(NTLMScheme.State.MsgType1Generated) < 0)
{
this.state = NTLMScheme.State.Failed;
throw new MalformedChallengeException("Out of sequence NTLM response message");
}
else
{
if (this.state == NTLMScheme.State.MsgType1Generated)
{
this.state = NTLMScheme.State.MsgType2Recevied;
}
}
}
}
/// <exception cref="Apache.Http.Auth.AuthenticationException"></exception>
public override Header Authenticate(Credentials credentials, IHttpRequest request
)
{
NTCredentials ntcredentials = null;
try
{
ntcredentials = (NTCredentials)credentials;
}
catch (InvalidCastException)
{
throw new InvalidCredentialsException("Credentials cannot be used for NTLM authentication: "
+ credentials.GetType().FullName);
}
string response = null;
if (this.state == NTLMScheme.State.Failed)
{
throw new AuthenticationException("NTLM authentication failed");
}
else
{
if (this.state == NTLMScheme.State.ChallengeReceived)
{
response = this.engine.GenerateType1Msg(ntcredentials.GetDomain(), ntcredentials.
GetWorkstation());
this.state = NTLMScheme.State.MsgType1Generated;
}
else
{
if (this.state == NTLMScheme.State.MsgType2Recevied)
{
response = this.engine.GenerateType3Msg(ntcredentials.GetUserName(), ntcredentials
.GetPassword(), ntcredentials.GetDomain(), ntcredentials.GetWorkstation(), this.
challenge);
this.state = NTLMScheme.State.MsgType3Generated;
}
else
{
throw new AuthenticationException("Unexpected state: " + this.state);
}
}
}
CharArrayBuffer buffer = new CharArrayBuffer(32);
if (IsProxy())
{
buffer.Append(AUTH.ProxyAuthResp);
}
else
{
buffer.Append(AUTH.WwwAuthResp);
}
buffer.Append(": NTLM ");
buffer.Append(response);
return(new BufferedHeader(buffer));
}