package/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 SERVICE_USE_PID=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_start()
  17 {
  18         append_ports()
  19         {
  20                 local ifname="$1"
  21                 local port="$2"
  22
  23                 grep -qs "^ *$ifname:" /proc/net/dev || {
  24                         append args "-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                         append args "-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         [ "${enabled}" -eq 0 ] && return 1
  45
  46         # verbose parameter
  47         local verbosed
  48         config_get_bool verbosed "${section}" verbose 0
  49
  50         # increase pid file count to handle multiple instances correctly
  51         PIDCOUNT="$(( ${PIDCOUNT} + 1))"
  52
  53         # prepare parameters (initialise with pid file)
  54         local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
  55         local args="-P $pid_file"
  56         local val
  57         # A) password authentication
  58         config_get_bool val "${section}" PasswordAuth 1
  59         [ "${val}" -eq 0 ] && append args "-s"
  60         # B) listen interface and port
  61         local port
  62         local interface
  63         config_get interface "${section}" Interface
  64         config_get interface "${interface}" ifname "$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}" ] && append args "-b ${val}"
  70         # D) gatewayports
  71         config_get_bool val "${section}" GatewayPorts 0
  72         [ "${val}" -eq 1 ] && append args "-a"
  73         # E) root password authentication
  74         config_get_bool val "${section}" RootPasswordAuth 1
  75         [ "${val}" -eq 0 ] && append args "-g"
  76         # F) root login
  77         config_get_bool val "${section}" RootLogin 1
  78         [ "${val}" -eq 0 ] && append args "-w"
  79         # G) host keys
  80         config_get val "${section}" rsakeyfile
  81         [ -f "${val}" ] && append args "-r ${val}"
  82         config_get val "${section}" dsskeyfile
  83         [ -f "${val}" ] && append args "-d ${val}"
  84
  85         # execute program and return its exit code
  86         [ "${verbosed}" -ne 0 ] && echo "${initscript}: section ${section} starting ${PROG} ${args}"
  87         SERVICE_PID_FILE="$pid_file" service_start ${PROG} ${args}
  88 }
  89
  90 keygen()
  91 {
  92         for keytype in rsa dss; do
  93                 # check for keys
  94                 key=dropbear/dropbear_${keytype}_host_key
  95                 [ -f /tmp/$key -o -s /etc/$key ] || {
  96                         # generate missing keys
  97                         mkdir -p /tmp/dropbear
  98                         [ -x /usr/bin/dropbearkey ] && {
  99                                 /usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
 100                         } &
 101                 exit 0
 102                 }
 103         done
 104
 105         lock /tmp/.switch2jffs
 106         mkdir -p /etc/dropbear
 107         mv /tmp/dropbear/dropbear_* /etc/dropbear/
 108         lock -u /tmp/.switch2jffs
 109         chown root /etc/dropbear
 110         chmod 0700 /etc/dropbear
 111 }
 112
 113 start()
 114 {
 115         [ -s /etc/dropbear/dropbear_rsa_host_key -a \
 116           -s /etc/dropbear/dropbear_dss_host_key ] || keygen
 117
 118         include /lib/network
 119         scan_interfaces
 120         config_load "${NAME}"
 121         config_foreach dropbear_start dropbear
 122 }
 123
 124 stop()
 125 {
 126         local pid_file pid_files
 127
 128         pid_files=`ls /var/run/${NAME}.*.pid 2>/dev/null`
 129
 130         [ -z "$pid_files" ] && return 1
 131
 132         for pid_file in $pid_files; do
 133                 SERVICE_PID_FILE="$pid_file" service_stop ${PROG} && {
 134                         rm -f ${pid_file}
 135                 }
 136         done
 137 }
 138
 139 killclients()
 140 {
 141         local ignore=''
 142         local server
 143         local pid
 144
 145         # if this script is run from inside a client session, then ignore that session
 146         pid="$$"
 147         while [ "${pid}" -ne 0 ]
 148          do
 149                 # get parent process id
 150                 pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
 151                 [ "${pid}" -eq 0 ] && break
 152
 153                 # check if client connection
 154                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
 155                         append ignore "${pid}"
 156                         break
 157                 }
 158         done
 159
 160         # get all server pids that should be ignored
 161         for server in `cat /var/run/${NAME}.*.pid`
 162          do
 163                 append ignore "${server}"
 164         done
 165
 166         # get all running pids and kill client connections
 167         local skip
 168         for pid in `pidof "${NAME}"`
 169          do
 170                 # check if correct program, otherwise process next pid
 171                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
 172                         continue
 173                 }
 174
 175                 # check if pid should be ignored (servers, ourself)
 176                 skip=0
 177                 for server in ${ignore}
 178                  do
 179                         if [ "${pid}" == "${server}" ]
 180                          then
 181                                 skip=1
 182                                 break
 183                         fi
 184                 done
 185                 [ "${skip}" -ne 0 ] && continue
 186
 187                 # kill process
 188                 echo "${initscript}: Killing ${pid}..."
 189                 kill -KILL ${pid}
 190         done
 191 }