This repository contains a .NET assembly implementing the "Authentication and Security Layer" (SASL) framework. SASL specifies a protocol for authentication and optional establishment of a security layer between client and server applications and is used by internet protocols such as IMAP, POP3, SMTP, XMPP and others.
To use the library add the S22.Sasl.Core.dll assembly to your project references in Visual Studio. Here's a simple example which instantiates a new instance of the Digest-Md5 authentication mechanism and demonstrates how it can be used to perform authentication.
using System;
using S22.Sasl;
using System.Net;
namespace Test
{
class Program
{
static void Main(string[] args)
{
SaslMechanism m = SaslFactory.Create("DIGEST-MD5");
// Add properties needed by authentication mechanism.
m.Properties.Add("Credential", new NetworkCredential("Foo", "Bar"));
byte[] challenge = null;
while (!m.IsCompleted)
{
challenge = m.GetResponse(challenge);
SendMyDataToServer(challenge);
challenge = ReceiveMyDataFromServer();
}
}
}
}
Here's a more advanced example to create NTLMv2 secure channel.
using System;
using S22.Sasl;
using System.Net;
using S22.Sasl.Mechanisms;
using S22.Sasl.Security;
using System.IO;
namespace Test
{
class Program
{
static void Main(string[] args)
{
var m = new SaslNtlmv2(new NetworkCredential("Foo", "Bar"), true);
// This is your server stream
Stream serverStream;
byte[] challenge = null;
while (!m.IsCompleted)
{
challenge = m.GetResponse(challenge);
// Send and receive authentication data from server
SendMyDataToServer(serverStream, challenge);
challenge = ReceiveMyDataFromServer(serverStream);
}
// Create a secure stream
var secureStream = new SaslStream(serverStream, new Ntlmv2Cipher(m.SessionKey));
SendMyDataToServer(secureStream, request);
var response = ReceiveMyDataFromServer(secureStream);
}
}
}
The library supports the following authentication mechanisms (and identifiers):
- Plain (PLAIN)
- Cram-Md5 (CRAM-MD5)
- NTLM (NTLM)
- NTLMv2 (NTLMV2)
- OAuth (OAUTH)
- OAuth 2.0 (OAUTH2)
- Digest-Md5 (DIGEST-MD5)
- Scram-Sha-1 (SCRAM-SHA-1)
- SRP (SRP)
Custom SASL Security Providers can be implemented through a simple plugin mechanism.
This library is copyright © 2013-2014 Torben Könke.
This library is released under the MIT license.
Please send your bug reports to [email protected] or create a new issue on the GitHub project homepage.
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