ocserv/TODO

* Add a simple username/password back-end in addition to PAM

* Fix SIGHUP handling on the main server.

* Keep the TLS key and certificates into the privileged process and use IPC
  for operations (this will make the privileged process a bottleneck).

* Add path MTU discovery.

* Think how the DTLS part can use better negotiation of algorithms and DTLS
  versions than the current openssl string approach (using PSK ciphersuites
  seem to be like a solution, but then we could not use the session ID to
  forward the UDP connection to the proper worker).

* Certificate authentication to the main process. Possibly that is just
  wishful thinking. To verify the TLS client certificate verify signature one
  needs instead of the signature, the contents of all the handshake messages, 
  and knowledge of the negotiated TLS version, in addition to being able to
  select the server hello random. That could be done sanely only if gnutls 
  provided facilities to set the server hello random, and override the client
  signature verification. Even in that case the handshake data need to be
  transferred to the main thread.

* Try adding salsa20-12 and UMAC as encryption algorithms for DTLS to reduce 
  CPU load.