protected void Setup(ref SecurityAssociation sa1, ref SecurityAssociation sa2)
{
sa1.Reset();
sa2.Reset();
sa1.RDHE.Value = sa2.LDHE;
sa2.RDHE.Value = sa1.LDHE;
Random rand = new Random();
byte[] b = new byte[128];
rand.NextBytes(b);
MemBlock mb = MemBlock.Reference(b);
sa1.DHEWithCertificateAndCAsOutHash.Value = mb;
sa1.VerifyResponse(mb);
b = new byte[128];
rand.NextBytes(b);
mb = MemBlock.Reference(b);
sa2.DHEWithCertificateHash.Value = mb;
sa2.VerifyRequest(mb);
sa1.Enable();
sa2.Enable();
// This is just for kicks
sa1.Enable();
}
/// <summary>This is the control state machine. There are three paths in
/// the state machine, iniator, receiver, and bidirectional. The
/// bidirectional case occurs when two remote ISenders that are matched
/// together initiate a handshake at the same time, otherwise the initiator
/// /receiver pattern is followed. The high level overview for the states
/// are:
/// 1a) Send a Cookie
/// 1b) Receive a Cookie which responds with a CookieResponse
/// 2a) Receive a CookieResponse that contains a list of CAs, if you have
/// a Certificate that supports one of the CAs send it along with a DHE
/// and a list of your supported CAs in a DHEWithCertificateAndCAs.
/// 2b) Receive a DHEWithCertificateAndCAs, verify the certificate and attempt
/// to find a matching Certificate for the list of CAs, if you find one,
/// finish the DHE handshake and send the certificate via a DHEWithCertificate
/// 3a) Receive a DHEWithCertificate, verify the certificate and DHE and
/// send a Confirm that you are ready to Verify the stack and start the
/// system.
/// 3b) Receive a Confirm, verify the entire stack and send a Confirm
/// 4a)Receive a Confirm, verify the entire stack and all set to go
/// </summary>
protected void HandleControl(MemBlock b, ISender return_path)
{
ISender low_level_sender = return_path;
if (low_level_sender is ReqrepManager.ReplyState)
{
low_level_sender = ((ReqrepManager.ReplyState)low_level_sender).ReturnPath;
}
SecurityControlMessage scm = new SecurityControlMessage(b);
MemBlock calc_cookie = CalculateCookie(low_level_sender);
if (scm.Version != Version)
{
throw new Exception("Invalid version: " + scm.Version);
}
else if (!SecurityPolicy.Supports(scm.SPI))
{
throw new Exception("No support for SPI: " + scm.SPI);
}
else if (!scm.RemoteCookie.Equals(calc_cookie))
{
if (scm.Type != SecurityControlMessage.MessageType.Cookie &&
scm.Type != SecurityControlMessage.MessageType.NoSuchSA)
{
throw new Exception("Invalid cookie!");
}
}
SecurityControlMessage scm_reply = new SecurityControlMessage();
scm_reply.Version = Version;
scm_reply.SPI = scm.SPI;
SecurityAssociation sa = null;
// This can be in a try statement since this is best effort anyway
try {
Dictionary <ISender, SecurityAssociation> sender_to_sa = _spi[scm.SPI];
sa = sender_to_sa[low_level_sender];
} catch { }
if (sa != null)
{
sa.Reset();
if (sa.Closed)
{
throw new Exception("SA closed!");
}
else if (sa.State == SecurityAssociation.SAState.Active)
{
return;
}
}
try {
switch (scm.Type)
{
case SecurityControlMessage.MessageType.NoSuchSA:
HandleControlNoSuchSA(sa);
break;
case SecurityControlMessage.MessageType.Cookie:
HandleControlCookie(sa, calc_cookie, scm, scm_reply, return_path, low_level_sender);
break;
case SecurityControlMessage.MessageType.CookieResponse:
HandleControlCookieResponse(sa, scm, scm_reply, return_path, low_level_sender);
break;
case SecurityControlMessage.MessageType.DHEWithCertificateAndCAs:
HandleControlDHEWithCertificateAndCAs(sa, scm, scm_reply, return_path, low_level_sender);
break;
case SecurityControlMessage.MessageType.DHEWithCertificate:
HandleControlDHEWithCertificates(sa, scm, scm_reply, return_path, low_level_sender);
break;
case SecurityControlMessage.MessageType.Confirm:
HandleControlConfirm(sa, scm, scm_reply, return_path, low_level_sender);
break;
default:
throw new Exception("Invalid message!");
}
} catch {
if (sa != null && sa.Closed)
{
throw new Exception("SA closed.");
}
else
{
throw;
}
}
}