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