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 ipaddrs="$1"
  18         local port="$2"
  19
  20         [ -z "$ipaddrs" ] && {
  21                 procd_append_param command -p "$port"
  22                 return
  23         }
  24
  25         for addr in $ipaddrs; do
  26                 procd_append_param command -p "$addr:$port"
  27         done
  28 }
  29
  30 validate_section_dropbear()
  31 {
  32         uci_validate_section dropbear dropbear "${1}" \
  33                 'PasswordAuth:bool:1' \
  34                 'enable:bool:1' \
  35                 'Interface:string' \
  36                 'GatewayPorts:bool:0' \
  37                 'RootPasswordAuth:bool:1' \
  38                 'RootLogin:bool:1' \
  39                 'rsakeyfile:file' \
  40                 'dsskeyfile:file' \
  41                 'BannerFile:file' \
  42                 'Port:list(port):22' \
  43                 'SSHKeepAlive:uinteger:300' \
  44                 'IdleTimeout:uinteger:0' \
  45                 'mdns:uinteger:1'
  46 }
  47
  48 dropbear_instance()
  49 {
  50         local PasswordAuth enable Interface GatewayPorts \
  51                 RootPasswordAuth RootLogin rsakeyfile \
  52                 dsskeyfile BannerFile Port SSHKeepAlive IdleTimeout \
  53                 mdns ipaddrs
  54
  55         validate_section_dropbear "${1}" || {
  56                 echo "validation failed"
  57                 return 1
  58         }
  59
  60         [ -n "${Interface}" ] && {
  61                 network_get_ipaddrs_all ipaddrs "${Interface}" || {
  62                         echo "interface ${Interface} has no physdev or physdev has no suitable ip"
  63                         return 1
  64                 }
  65         }
  66
  67         [ "${enable}" = "0" ] && return 1
  68         PIDCOUNT="$(( ${PIDCOUNT} + 1))"
  69         local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
  70
  71         procd_open_instance
  72         procd_set_param command "$PROG" -F -P "$pid_file"
  73         [ "${PasswordAuth}" -eq 0 ] && procd_append_param command -s
  74         [ "${GatewayPorts}" -eq 1 ] && procd_append_param command -a
  75         [ "${RootPasswordAuth}" -eq 0 ] && procd_append_param command -g
  76         [ "${RootLogin}" -eq 0 ] && procd_append_param command -w
  77         [ -n "${rsakeyfile}" ] && procd_append_param command -r "${rsakeyfile}"
  78         [ -n "${dsskeyfile}" ] && procd_append_param command -d "${dsskeyfile}"
  79         [ -n "${BannerFile}" ] && procd_append_param command -b "${BannerFile}"
  80         append_ports "${ipaddrs}" "${Port}"
  81         [ "${IdleTimeout}" -ne 0 ] && procd_append_param command -I "${IdleTimeout}"
  82         [ "${SSHKeepAlive}" -ne 0 ] && procd_append_param command -K "${SSHKeepAlive}"
  83         [ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
  84         procd_close_instance
  85 }
  86
  87 keygen()
  88 {
  89         for keytype in rsa dss; do
  90                 # check for keys
  91                 key=dropbear/dropbear_${keytype}_host_key
  92                 [ -f /tmp/$key -o -s /etc/$key ] || {
  93                         # generate missing keys
  94                         mkdir -p /tmp/dropbear
  95                         [ -x /usr/bin/dropbearkey ] && {
  96                                 /usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
  97                         } &
  98                 exit 0
  99                 }
 100         done
 101
 102         lock /tmp/.switch2jffs
 103         mkdir -p /etc/dropbear
 104         mv /tmp/dropbear/dropbear_* /etc/dropbear/
 105         lock -u /tmp/.switch2jffs
 106         chown root /etc/dropbear
 107         chmod 0700 /etc/dropbear
 108 }
 109
 110 start_service()
 111 {
 112         [ -s /etc/dropbear/dropbear_rsa_host_key -a \
 113           -s /etc/dropbear/dropbear_dss_host_key ] || keygen
 114
 115         . /lib/functions.sh
 116         . /lib/functions/network.sh
 117
 118         config_load "${NAME}"
 119         config_foreach dropbear_instance dropbear
 120 }
 121
 122 service_triggers()
 123 {
 124         procd_add_reload_trigger "dropbear"
 125         procd_add_validation validate_section_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 }