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=19
   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_load_validate dropbear dropbear "$1" "$2" \
  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                 'BannerFile:file' \
  41                 'Port:list(port):22' \
  42                 'SSHKeepAlive:uinteger:300' \
  43                 'IdleTimeout:uinteger:0' \
  44                 'MaxAuthTries:uinteger:3' \
  45                 'RecvWindowSize:uinteger:0' \
  46                 'mdns:bool:1'
  47 }
  48
  49 dropbear_instance()
  50 {
  51         local ipaddrs
  52
  53         [ "$2" = 0 ] || {
  54                 echo "validation failed"
  55                 return 1
  56         }
  57
  58         [ -n "${Interface}" ] && {
  59                 [ -n "${BOOT}" ] && return 0
  60
  61                 network_get_ipaddrs_all ipaddrs "${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 "${rsakeyfile}"
  78         [ -n "${BannerFile}" ] && procd_append_param command -b "${BannerFile}"
  79         append_ports "${ipaddrs}" "${Port}"
  80         [ "${IdleTimeout}" -ne 0 ] && procd_append_param command -I "${IdleTimeout}"
  81         [ "${SSHKeepAlive}" -ne 0 ] && procd_append_param command -K "${SSHKeepAlive}"
  82         [ "${MaxAuthTries}" -ne 0 ] && procd_append_param command -T "${MaxAuthTries}"
  83         [ "${RecvWindowSize}" -gt 0 -a "${RecvWindowSize}" -le 1048576 ] && \
  84                 procd_append_param command -W "${RecvWindowSize}"
  85         [ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
  86         procd_set_param respawn
  87         procd_close_instance
  88 }
  89
  90 keygen()
  91 {
  92         for keytype in rsa; 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 load_interfaces()
 114 {
 115         config_get interface "$1" Interface
 116         config_get enable "$1" enable 1
 117
 118         [ "${enable}" = "1" ] && interfaces=" ${interface} ${interfaces}"
 119 }
 120
 121 boot()
 122 {
 123         BOOT=1
 124         start "$@"
 125 }
 126
 127 start_service()
 128 {
 129         [ -s /etc/dropbear/dropbear_rsa_host_key ] || keygen
 130
 131         . /lib/functions.sh
 132         . /lib/functions/network.sh
 133
 134         config_load "${NAME}"
 135         config_foreach validate_section_dropbear dropbear dropbear_instance
 136 }
 137
 138 service_triggers()
 139 {
 140         local interfaces
 141
 142         procd_add_config_trigger "config.change" "dropbear" /etc/init.d/dropbear reload
 143
 144         config_load "${NAME}"
 145         config_foreach load_interfaces dropbear
 146
 147         [ -n "${interfaces}" ] && {
 148                 for n in $interfaces ; do
 149                         procd_add_interface_trigger "interface.*" $n /etc/init.d/dropbear reload
 150                 done
 151         }
 152
 153         procd_add_validation validate_section_dropbear
 154 }
 155
 156 shutdown() {
 157         # close all open connections
 158         killall dropbear
 159 }
 160
 161 killclients()
 162 {
 163         local ignore=''
 164         local server
 165         local pid
 166
 167         # if this script is run from inside a client session, then ignore that session
 168         pid="$$"
 169         while [ "${pid}" -ne 0 ]
 170          do
 171                 # get parent process id
 172                 pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
 173                 [ "${pid}" -eq 0 ] && break
 174
 175                 # check if client connection
 176                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
 177                         append ignore "${pid}"
 178                         break
 179                 }
 180         done
 181
 182         # get all server pids that should be ignored
 183         for server in `cat /var/run/${NAME}.*.pid`
 184          do
 185                 append ignore "${server}"
 186         done
 187
 188         # get all running pids and kill client connections
 189         local skip
 190         for pid in `pidof "${NAME}"`
 191          do
 192                 # check if correct program, otherwise process next pid
 193                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
 194                         continue
 195                 }
 196
 197                 # check if pid should be ignored (servers, ourself)
 198                 skip=0
 199                 for server in ${ignore}
 200                  do
 201                         if [ "${pid}" = "${server}" ]
 202                          then
 203                                 skip=1
 204                                 break
 205                         fi
 206                 done
 207                 [ "${skip}" -ne 0 ] && continue
 208
 209                 # kill process
 210                 echo "${initscript}: Killing ${pid}..."
 211                 kill -KILL ${pid}
 212         done
 213 }