package/network/services/dropbear/files/dropbear.init

   1 #!/bin/sh /etc/rc.common
   2 # Copyright (C) 2006-2010 OpenWrt.org
   3 # Copyright (C) 2006 Carlos Sobrinho
   4
   5 START=50
   6 STOP=50
   7
   8 USE_PROCD=1
   9 PROG=/usr/sbin/dropbear
  10 NAME=dropbear
  11 PIDCOUNT=0
  12 EXTRA_COMMANDS="killclients"
  13 EXTRA_HELP="    killclients Kill ${NAME} processes except servers and yourself"
  14
  15 append_ports()
  16 {
  17         local ifname="$1"
  18         local port="$2"
  19
  20         grep -qs "^ *$ifname:" /proc/net/dev || {
  21                 procd_append_param command -p "$port"
  22                 return
  23         }
  24
  25         for addr in $(
  26                 ifconfig "$ifname" | sed -ne '
  27                         /addr: *fe[89ab][0-9a-f]:/d
  28                         s/.* addr: *\([0-9a-f:\.]*\).*/\1/p
  29                 '
  30         ); do
  31                 procd_append_param command -p "$addr:$port"
  32         done
  33 }
  34
  35 validate_section_dropbear()
  36 {
  37         uci_validate_section dropbear dropbear "${1}" \
  38                 'PasswordAuth:bool:1' \
  39                 'enable:bool:1' \
  40                 'Interface:string' \
  41                 'GatewayPorts:bool:0' \
  42                 'RootPasswordAuth:bool:1' \
  43                 'RootLogin:bool:1' \
  44                 'rsakeyfile:file' \
  45                 'dsskeyfile:file' \
  46                 'BannerFile:file' \
  47                 'Port:list(port):22'
  48         return $?
  49 }
  50
  51 dropbear_instance()
  52 {
  53         local PasswordAuth enable Interface GatewayPorts \
  54                 RootPasswordAuth RootLogin rsakeyfile \
  55                 dsskeyfile BannerFile Port
  56
  57         validate_section_dropbear "${1}" || {
  58                 echo "validation failed"
  59                 return 1
  60         }
  61
  62         [ "${enable}" = "0" ] && return 1
  63         PIDCOUNT="$(( ${PIDCOUNT} + 1))"
  64         local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
  65
  66         procd_open_instance
  67         procd_set_param command "$PROG" -F -P "$pid_file"
  68         [ "${PasswordAuth}" -eq 0 ] && procd_append_param command -s
  69         [ "${GatewayPorts}" -eq 1 ] && procd_append_param command -a
  70         [ "${RootPasswordAuth}" -eq 0 ] && procd_append_param command -g
  71         [ "${RootLogin}" -eq 0 ] && procd_append_param command -w
  72         [ -n "${rsakeyfile}" ] && procd_append_param command -r "${rsakeyfile}"
  73         [ -n "${dsskeyfile}" ] && procd_append_param command -d "${dsskeyfile}"
  74         [ -n "${BannerFile}" ] && procd_append_param command -b "${BannerFile}"
  75         [ -n "${interface}" ] && network_get_device interface "${interface}"
  76         append_ports "${interface}" "${Port}"
  77         procd_close_instance
  78 }
  79
  80 keygen()
  81 {
  82         for keytype in rsa dss; do
  83                 # check for keys
  84                 key=dropbear/dropbear_${keytype}_host_key
  85                 [ -f /tmp/$key -o -s /etc/$key ] || {
  86                         # generate missing keys
  87                         mkdir -p /tmp/dropbear
  88                         [ -x /usr/bin/dropbearkey ] && {
  89                                 /usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
  90                         } &
  91                 exit 0
  92                 }
  93         done
  94
  95         lock /tmp/.switch2jffs
  96         mkdir -p /etc/dropbear
  97         mv /tmp/dropbear/dropbear_* /etc/dropbear/
  98         lock -u /tmp/.switch2jffs
  99         chown root /etc/dropbear
 100         chmod 0700 /etc/dropbear
 101 }
 102
 103 start_service()
 104 {
 105         [ -s /etc/dropbear/dropbear_rsa_host_key -a \
 106           -s /etc/dropbear/dropbear_dss_host_key ] || keygen
 107
 108         . /lib/functions.sh
 109         . /lib/functions/network.sh
 110
 111         config_load "${NAME}"
 112         config_foreach dropbear_instance dropbear
 113 }
 114
 115 service_triggers()
 116 {
 117         procd_add_reload_trigger "dropbear"
 118         procd_add_validation validate_section_dropbear
 119 }
 120
 121 killclients()
 122 {
 123         local ignore=''
 124         local server
 125         local pid
 126
 127         # if this script is run from inside a client session, then ignore that session
 128         pid="$$"
 129         while [ "${pid}" -ne 0 ]
 130          do
 131                 # get parent process id
 132                 pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
 133                 [ "${pid}" -eq 0 ] && break
 134
 135                 # check if client connection
 136                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
 137                         append ignore "${pid}"
 138                         break
 139                 }
 140         done
 141
 142         # get all server pids that should be ignored
 143         for server in `cat /var/run/${NAME}.*.pid`
 144          do
 145                 append ignore "${server}"
 146         done
 147
 148         # get all running pids and kill client connections
 149         local skip
 150         for pid in `pidof "${NAME}"`
 151          do
 152                 # check if correct program, otherwise process next pid
 153                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
 154                         continue
 155                 }
 156
 157                 # check if pid should be ignored (servers, ourself)
 158                 skip=0
 159                 for server in ${ignore}
 160                  do
 161                         if [ "${pid}" == "${server}" ]
 162                          then
 163                                 skip=1
 164                                 break
 165                         fi
 166                 done
 167                 [ "${skip}" -ne 0 ] && continue
 168
 169                 # kill process
 170                 echo "${initscript}: Killing ${pid}..."
 171                 kill -KILL ${pid}
 172         done
 173 }