mdw@git.distorted.org.uk Git - misc/blob - sshsvc-mkauthkeys

   1 #! /bin/sh
   2 ###
   3 ### Generate .ssh/authorized_keys files for SSH services
   4 ###
   5 ### (c) 2015 Mark Wooding
   6 ###
   7
   8 ###----- Licensing notice ---------------------------------------------------
   9 ###
  10 ### This program is free software; you can redistribute it and/or modify
  11 ### it under the terms of the GNU General Public License as published by
  12 ### the Free Software Foundation; either version 2 of the License, or
  13 ### (at your option) any later version.
  14 ###
  15 ### This program is distributed in the hope that it will be useful,
  16 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ### GNU General Public License for more details.
  19 ###
  20 ### You should have received a copy of the GNU General Public License
  21 ### along with this program; if not, write to the Free Software
  22 ### Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  23
  24 set -e
  25
  26 ## Initial setup.
  27 allow_agent_forwarding=no
  28 allow_x11_forwarding=no
  29 allow_port_forwarding=no
  30 allow_pty=no
  31 env="SSHSVC_USER=@user"
  32 cmd="bin/sshsvc"
  33
  34 ## Hook functions.
  35 make_key_line () {
  36   user=$1
  37   e=$env
  38   while :; do
  39     progressp=t
  40     case "$e" in
  41       *@user*) e=${e%%@user*}$user${e#*@user} ;;
  42       *) progressp=nil ;;
  43     esac
  44     case $progressp in nil) break ;; esac
  45   done
  46   line="environment=\"$e\""
  47   echo "$line"
  48 }
  49
  50 make_full_key_line () {
  51   user=$1
  52   line=$(make_key_line "$user")
  53   case "${cmd+t},$line" in
  54     ,* | *,command=*) ;;
  55     t,*) line="command=\"$cmd\",$line" ;;
  56   esac
  57   case "$allow_port_forwarding" in
  58     yes) ;; *) line="no-port-forwarding,$line" ;;
  59   esac
  60   case "$allow_x11_forwarding" in
  61     yes) ;; *) line="no-X11-forwarding,$line" ;;
  62   esac
  63   case "$allow_agent_forwarding" in
  64     yes) ;; *) line="no-agent-forwarding,$line" ;;
  65   esac
  66   case "$allow_pty" in
  67     yes) ;; *) line="no-pty,$line" ;;
  68   esac
  69   echo "$line"
  70 }
  71
  72 ## Scan the command line.
  73 prog=${0##*/} bogusp=nil
  74 conf=sshsvc.conf out=authorized_keys keysdir=keys
  75 head=sshsvc-authkeys.head tail=sshsvc-authkeys.tail
  76 usage () {
  77   echo "usage: $prog [-c CONF] [-k DIR] [-o OUTPUT] [-H HEAD] [-T TAIL]"
  78 }
  79 while getopts hc:k:o:H:T: opt; do
  80   case $opt in
  81     h) usage; exit 0 ;;
  82     c) conf=$OPTARG ;;
  83     k) keysdir=$OPTARG ;;
  84     o) out=$OPTARG ;;
  85     H) head=$OPTARG ;;
  86     T) tail=$OPTARG ;;
  87     *) bogusp=t ;;
  88   esac
  89 done
  90 shift $(( $OPTIND - 1 ))
  91 case $# in 0) ;; *) bogusp=t ;; esac
  92 case $bogusp in t) usage >&2; exit 1 ;; esac
  93
  94 ## Read the configuration.
  95 case $conf in /*) ;; *) conf=./$conf ;; esac
  96 . "$conf"
  97
  98 ## Do the thing.
  99 case $out in
 100   -) exec 3>&1 ;;
 101   *) exec 3>"$out.new" ;;
 102 esac
 103
 104 echo >&3 "### GENERATED by $prog"
 105
 106 if [ -r "$head" ]; then cat "$head" >&3; fi
 107
 108 for i in "$keysdir"/*.pub; do
 109   u=${i#*/}; u=${u%.*}; u=${u%%!*}
 110   l=$(make_full_key_line "$u")
 111   k=$(cat "$i")
 112   echo >&3 "$l $k"
 113 done
 114
 115 if [ -r "$tail" ]; then cat "$tail" >&3; fi
 116
 117 echo >&3 "### GENERATED by $prog"
 118
 119 exec 3>&-
 120 case $out in
 121   -) ;;
 122   *) mv "$out.new" "$out" ;;
 123 esac