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
  10 NAME=dropbear
  11 PROG=/usr/sbin/dropbear
  12 PIDCOUNT=0
  13 EXTRA_COMMANDS="killclients"
  14 EXTRA_HELP="    killclients Kill ${NAME} processes except servers and yourself"
  15
  16 dropbear_instance()
  17 {
  18         append_ports()
  19         {
  20                 local ifname="$1"
  21                 local port="$2"
  22
  23                 grep -qs "^ *$ifname:" /proc/net/dev || {
  24                         procd_append_param command -p "$port"
  25                         return
  26                 }
  27
  28                 for addr in $(
  29                         ifconfig "$ifname" | sed -ne '
  30                                 /addr: *fe[89ab][0-9a-f]:/d
  31                                 s/.* addr: *\([0-9a-f:\.]*\).*/\1/p
  32                         '
  33                 ); do
  34                         procd_append_param command -p "$addr:$port"
  35                 done
  36         }
  37
  38
  39         local section="$1"
  40
  41         # check if section is enabled (default)
  42         local enabled
  43         config_get_bool enabled "${section}" enable 1
  44         [ "${enabled}" -eq 0 ] && return 1
  45
  46         # increase pid file count to handle multiple instances correctly
  47         PIDCOUNT="$(( ${PIDCOUNT} + 1))"
  48
  49         local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
  50
  51         procd_open_instance
  52         procd_set_param command "$PROG" -F -P "$pid_file"
  53
  54         # prepare parameters (initialise with pid file)
  55         local val
  56
  57         # A) password authentication
  58         config_get_bool val "${section}" PasswordAuth 1
  59         [ "${val}" -eq 0 ] && procd_append_param command -s
  60
  61         # B) listen interface and port
  62         local port
  63         local interface
  64         config_get interface "${section}" Interface
  65         [ -n "$interface" ] && network_get_device interface "$interface"
  66         config_get port "${section}" Port 22
  67         append_ports "$interface" "$port"
  68         # C) banner file
  69         config_get val "${section}" BannerFile
  70         [ -f "${val}" ] && procd_append_param command -b "${val}"
  71         # D) gatewayports
  72         config_get_bool val "${section}" GatewayPorts 0
  73         [ "${val}" -eq 1 ] && procd_append_param command -a
  74         # E) root password authentication
  75         config_get_bool val "${section}" RootPasswordAuth 1
  76         [ "${val}" -eq 0 ] && procd_append_param command -g
  77         # F) root login
  78         config_get_bool val "${section}" RootLogin 1
  79         [ "${val}" -eq 0 ] && procd_append_param command -w
  80         # G) host keys
  81         config_get val "${section}" rsakeyfile
  82         [ -f "${val}" ] && procd_append_param command -r "${val}"
  83         config_get val "${section}" dsskeyfile
  84         [ -f "${val}" ] && procd_append_param command -d "${val}"
  85
  86         procd_close_instance
  87 }
  88
  89 keygen()
  90 {
  91         for keytype in rsa dss; do
  92                 # check for keys
  93                 key=dropbear/dropbear_${keytype}_host_key
  94                 [ -f /tmp/$key -o -s /etc/$key ] || {
  95                         # generate missing keys
  96                         mkdir -p /tmp/dropbear
  97                         [ -x /usr/bin/dropbearkey ] && {
  98                                 /usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
  99                         } &
 100                 exit 0
 101                 }
 102         done
 103
 104         lock /tmp/.switch2jffs
 105         mkdir -p /etc/dropbear
 106         mv /tmp/dropbear/dropbear_* /etc/dropbear/
 107         lock -u /tmp/.switch2jffs
 108         chown root /etc/dropbear
 109         chmod 0700 /etc/dropbear
 110 }
 111
 112 start_service()
 113 {
 114         [ -s /etc/dropbear/dropbear_rsa_host_key -a \
 115           -s /etc/dropbear/dropbear_dss_host_key ] || keygen
 116
 117         . /lib/functions.sh
 118         . /lib/functions/network.sh
 119
 120         config_load "${NAME}"
 121         config_foreach dropbear_instance dropbear
 122 }
 123
 124 service_triggers()
 125 {
 126         procd_add_config_trigger "dropbear" "/etc/init.d/dropbear" "restart"
 127 }
 128
 129 killclients()
 130 {
 131         local ignore=''
 132         local server
 133         local pid
 134
 135         # if this script is run from inside a client session, then ignore that session
 136         pid="$$"
 137         while [ "${pid}" -ne 0 ]
 138          do
 139                 # get parent process id
 140                 pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
 141                 [ "${pid}" -eq 0 ] && break
 142
 143                 # check if client connection
 144                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
 145                         append ignore "${pid}"
 146                         break
 147                 }
 148         done
 149
 150         # get all server pids that should be ignored
 151         for server in `cat /var/run/${NAME}.*.pid`
 152          do
 153                 append ignore "${server}"
 154         done
 155
 156         # get all running pids and kill client connections
 157         local skip
 158         for pid in `pidof "${NAME}"`
 159          do
 160                 # check if correct program, otherwise process next pid
 161                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
 162                         continue
 163                 }
 164
 165                 # check if pid should be ignored (servers, ourself)
 166                 skip=0
 167                 for server in ${ignore}
 168                  do
 169                         if [ "${pid}" == "${server}" ]
 170                          then
 171                                 skip=1
 172                                 break
 173                         fi
 174                 done
 175                 [ "${skip}" -ne 0 ] && continue
 176
 177                 # kill process
 178                 echo "${initscript}: Killing ${pid}..."
 179                 kill -KILL ${pid}
 180         done
 181 }