/// <summary>
/// Perform the next step
/// </summary>
/// <param name="s">Null if it's the initial response</param>
/// <param name="doc">Document to create Steps in</param>
/// <returns></returns>
public override Step step(Step s, XmlDocument doc)
{
Debug.Assert(s == null);
Auth a = new Auth(doc);
a.Mechanism = MechanismType.EXTERNAL;
return a;
}
/// <summary>
/// Perform the next step
/// </summary>
/// <param name="s">Null if it's the initial response</param>
/// <param name="doc">Document to create Steps in</param>
/// <returns>XML to send to the XMPP server.</returns>
public override Step step(Step s, XmlDocument doc)
{
byte[] outBytes;
byte[] inBytes = null;
Step returnStep;
if (s == null)
{
// First step.
returnStep = new Auth(doc);
((Auth)returnStep).Mechanism = MechanismType.GSSAPI;
SetCredentials();
}
else
{
returnStep = new Response(doc);
inBytes = s.Bytes;
}
kerbClient.ExecuteKerberos(inBytes, out outBytes);
returnStep.Bytes = outBytes;
return returnStep;
}
/// <summary>
/// Perform the next step
/// </summary>
/// <param name="s">Null if it's the initial response</param>
/// <param name="doc">Document to create Steps in</param>
/// <returns></returns>
public override Step step(Step s, XmlDocument doc)
{
Debug.Assert(s == null);
Auth a = new Auth(doc);
a.Mechanism = MechanismType.PLAIN;
MemoryStream ms = new MemoryStream();
// message = [authorize-id] NUL authenticate-id NUL password
// Skip authzid.
ms.WriteByte(0);
string u = this[USERNAME];
if ((u == null) || (u == ""))
throw new SASLException("Username required");
byte[] bu = System.Text.Encoding.UTF8.GetBytes(u);
ms.Write(bu, 0, bu.Length);
ms.WriteByte(0);
string p = this[PASSWORD];
if ((p == null) || (p == ""))
throw new SASLException("Password required");
byte[] pu = System.Text.Encoding.UTF8.GetBytes(p);
ms.Write(pu, 0, pu.Length);
a.Bytes = ms.ToArray();
return a;
}
/// <summary>
/// Process the next DIGEST-MD5 step.
/// </summary>
/// <param name="s">The previous step. Null for the first step</param>
/// <param name="doc">Document to create next step in.</param>
/// <returns></returns>
/// <exception cref="AuthenticationFailedException">Thrown if authentication fails</exception>
public override Step step(Step s, XmlDocument doc)
{
Step resp = null;
if (s == null)
{ // first step
Auth a = new Auth(doc);
a.Mechanism = MechanismType.DIGEST_MD5;
return a;
}
Debug.Assert(s is Challenge);
populateDirectives(ENC.GetString(s.Bytes));
validateStartDirectives();
resp = new Response(doc);
if (this["rspauth"] == null) // we haven't authenticated yet
{
generateResponseString();
resp.Bytes = generateResponse();
}
else // we have authenticated
{
// make sure what is in rspauth is correct
if (!validateResponseAuth())
{
throw new AuthenticationFailedException();
}
}
return resp;
}