mdw@git.distorted.org.uk Git - hippotat/blob - PROTOCOL

   1 Server maintains a queue of outbound packets for each user
   2
   3 Packets which are older than the applicable max_queue_time are discarded
   4
   5 Each incoming request to the server takes up to max_batch_down bytes
   6 from the queue and returns them as the POST response body payload
   7
   8 Each incoming request contains up to max_batch_up bytes of payload.
   9 It's a multipart/form-data.
  10
  11 Authentication: clock-based lifetime-limited bearer tokens.
  12
  13 Encryption and integrity checking: none.  Use a real VPN over this!
  14
  15 Routing assistance: none in hippotat; can be requested on client
  16  from userv-ipif via `vroutes' parameter.  Use with secnet polypath
  17  ideally uses the special support in secnet 0.4.x.
  18
  19 Client form parameters (multipart/form-data):
  20  m              metadata, newline-separated list (text file) of
  21                         client ip address (textual)
  22                         token
  23                         target_requests_outstanding
  24                         http_timeout
  25  d              data (SLIP format, with SLIP_ESC and `-' swapped)
  26
  27
  28 Authentication token is:
  29         <time_t in hex with no leading 0s> <hmac in base64>
  30 (separated by a single space).  The hmac is
  31         HMAC(secret, <time_t in hex>)
  32
  33
  34 Possible future nonce-based authentication:
  35
  36 server keeps big nonce counter for each client
  37 meaning is:
  38  nonce counter is most recent nonce client has sent
  39 also server keeps bitmap of the previous ?64 nonces,
  40  whether client has sent them
  41
  42 client picks.... xxx