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 "${1}" \
  38                 'PasswordAuth:bool:1' \
  39                 'enable:bool:1' \
  40                 'Interface:string' \
  41                 'GatewayPorts:bool:0' \
  42                 'RootPasswordAuth:bool:1' \
  43                 'RootLogin:bool:1' \
  44                 'rsakeyfile:file' \
  45                 'dsskeyfile:file' \
  46                 'BannerFile:file' \
  47                 'Port:list(port):22' \
  48                 'SSHKeepAlive:uinteger:300' \
  49                 'IdleTimeout:uinteger:0' \
  50                 'mdns:uinteger:1'
  51 }
  52
  53 dropbear_instance()
  54 {
  55         local PasswordAuth enable Interface GatewayPorts \
  56                 RootPasswordAuth RootLogin rsakeyfile \
  57                 dsskeyfile BannerFile Port SSHKeepAlive IdleTimeout \
  58                 mdns
  59
  60         validate_section_dropbear "${1}" || {
  61                 echo "validation failed"
  62                 return 1
  63         }
  64
  65         [ "${enable}" = "0" ] && return 1
  66         PIDCOUNT="$(( ${PIDCOUNT} + 1))"
  67         local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
  68
  69         procd_open_instance
  70         procd_set_param command "$PROG" -F -P "$pid_file"
  71         [ "${PasswordAuth}" -eq 0 ] && procd_append_param command -s
  72         [ "${GatewayPorts}" -eq 1 ] && procd_append_param command -a
  73         [ "${RootPasswordAuth}" -eq 0 ] && procd_append_param command -g
  74         [ "${RootLogin}" -eq 0 ] && procd_append_param command -w
  75         [ -n "${rsakeyfile}" ] && procd_append_param command -r "${rsakeyfile}"
  76         [ -n "${dsskeyfile}" ] && procd_append_param command -d "${dsskeyfile}"
  77         [ -n "${BannerFile}" ] && procd_append_param command -b "${BannerFile}"
  78         [ -n "${Interface}" ] && network_get_device Interface "${Interface}"
  79         append_ports "${Interface}" "${Port}"
  80         [ "${IdleTimeout}" -ne 0 ] && procd_append_param command -I "${IdleTimeout}"
  81         [ "${SSHKeepAlive}" -ne 0 ] && procd_append_param command -K "${SSHKeepAlive}"
  82         [ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
  83         procd_close_instance
  84 }
  85
  86 keygen()
  87 {
  88         for keytype in rsa dss; do
  89                 # check for keys
  90                 key=dropbear/dropbear_${keytype}_host_key
  91                 [ -f /tmp/$key -o -s /etc/$key ] || {
  92                         # generate missing keys
  93                         mkdir -p /tmp/dropbear
  94                         [ -x /usr/bin/dropbearkey ] && {
  95                                 /usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
  96                         } &
  97                 exit 0
  98                 }
  99         done
 100
 101         lock /tmp/.switch2jffs
 102         mkdir -p /etc/dropbear
 103         mv /tmp/dropbear/dropbear_* /etc/dropbear/
 104         lock -u /tmp/.switch2jffs
 105         chown root /etc/dropbear
 106         chmod 0700 /etc/dropbear
 107 }
 108
 109 start_service()
 110 {
 111         [ -s /etc/dropbear/dropbear_rsa_host_key -a \
 112           -s /etc/dropbear/dropbear_dss_host_key ] || keygen
 113
 114         . /lib/functions.sh
 115         . /lib/functions/network.sh
 116
 117         config_load "${NAME}"
 118         config_foreach dropbear_instance dropbear
 119 }
 120
 121 service_triggers()
 122 {
 123         procd_add_reload_trigger "dropbear"
 124         procd_add_validation validate_section_dropbear
 125 }
 126
 127 killclients()
 128 {
 129         local ignore=''
 130         local server
 131         local pid
 132
 133         # if this script is run from inside a client session, then ignore that session
 134         pid="$$"
 135         while [ "${pid}" -ne 0 ]
 136          do
 137                 # get parent process id
 138                 pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
 139                 [ "${pid}" -eq 0 ] && break
 140
 141                 # check if client connection
 142                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
 143                         append ignore "${pid}"
 144                         break
 145                 }
 146         done
 147
 148         # get all server pids that should be ignored
 149         for server in `cat /var/run/${NAME}.*.pid`
 150          do
 151                 append ignore "${server}"
 152         done
 153
 154         # get all running pids and kill client connections
 155         local skip
 156         for pid in `pidof "${NAME}"`
 157          do
 158                 # check if correct program, otherwise process next pid
 159                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
 160                         continue
 161                 }
 162
 163                 # check if pid should be ignored (servers, ourself)
 164                 skip=0
 165                 for server in ${ignore}
 166                  do
 167                         if [ "${pid}" == "${server}" ]
 168                          then
 169                                 skip=1
 170                                 break
 171                         fi
 172                 done
 173                 [ "${skip}" -ne 0 ] && continue
 174
 175                 # kill process
 176                 echo "${initscript}: Killing ${pid}..."
 177                 kill -KILL ${pid}
 178         done
 179 }