mdw@git.distorted.org.uk Git - tripe/blob - contrib/knock.in

   1 #! /bin/sh
   2
   3 set -e
   4
   5 ### This script performs the passive side of a dynamic association.  It is
   6 ### intended to be set as the `tripe' user's shell, and invoked via ssh(1).
   7 ### Specifically, for each dynamic peer, add a line to `.ssh/authorized_keys'
   8 ### of the form
   9 ###
  10 ###     command="PEER" ssh-rsa ...
  11 ###
  12 ### There's an additional wrinkle.  Suppose that the passive TrIPE endpoint
  13 ### is behind a NAT, and the SSH gateway is on a different machine.  The
  14 ### gateway should have its own `tripe' user, and this script should again be
  15 ### its shell.  On the gateway, add a `.ssh/authorized_keys' entry
  16 ###
  17 ###     command="tripe@SERVER:PEER" ssh-rsa ...
  18 ###
  19 ### for the dynamic endpoint.  On the passive endpoint itself, you need an
  20 ### entry for the gateway's `tripe' user's key, with no command.
  21
  22 : ${prefix=@prefix@} ${exec_prefix=@exec_prefix@}
  23 : ${bindir=@bindir@}
  24 : ${TRIPEDIR=@configdir@} ${TRIPESOCK=@socketdir@/tripesock}
  25 : ${tripectl=$bindir/tripectl}
  26 export TRIPEDIR TRIPESOCK
  27
  28 case "$#,$1,$2" in
  29
  30   2,-c,*:*)
  31     ## Proxy through to another server.
  32     server=${2%:*} user=${2##*:}
  33     exec ssh "$server" "$user"
  34     ;;
  35
  36   2,-c,*)
  37     ## Connect to the local tripe server.
  38     exec $tripectl SVCSUBMIT connect passive "$2"
  39     ;;
  40
  41   *)
  42     ## Anything else is an error.
  43     echo >&2 "usage: $0 -c [SERVER:]PEER"
  44     exit 1
  45     ;;
  46
  47 esac