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 ${NAME} processes except servers and yourself"
  14
  15 _dropbearkey()
  16 {
  17         /usr/bin/dropbearkey "$@" 0<&- 1>&- 2>&-
  18 }
  19
  20 # $1 - host key file name
  21 hk_verify()
  22 {
  23         [ -f "$1" ] || return 1
  24         [ -s "$1" ] || return 2
  25         _dropbearkey -y -f "$1" || return 3
  26         return 0
  27 }
  28
  29 # $1 - hk_verify() return code
  30 hk_errmsg()
  31 {
  32         case "$1" in
  33         0) ;;
  34         1) echo "file does not exist" ;;
  35         2) echo "file has zero length" ;;
  36         3) echo "file is not valid host key or not supported" ;;
  37         *) echo "unknown error" ;;
  38         esac
  39 }
  40
  41 # $1 - config option
  42 # $2 - host key file name
  43 hk_config()
  44 {
  45         local x m
  46         hk_verify "$2"; x=$?
  47         case "$x" in
  48         0)      procd_append_param command -r "$2"
  49                 ;;
  50         *)      m=$(hk_errmsg "$x")
  51                 logger -t "${NAME}" -p daemon.warn \
  52                   "option '$1', value '$2': $m, skipping"
  53                 ;;
  54         esac
  55 }
  56
  57 # $1 - host key file name
  58 hk_config__keyfile()
  59 {
  60         hk_config 'keyfile' "$1"
  61 }
  62
  63 hk_generate_as_needed()
  64 {
  65         local kdir kgen ktype tdir kcount tfile tlock
  66         kdir='/etc/dropbear'
  67
  68         kgen=''
  69         for ktype in ecdsa rsa; do
  70                 hk_verify "${kdir}/dropbear_${ktype}_host_key" && continue
  71
  72                 kgen="${kgen} ${ktype}"
  73         done
  74
  75         [ -z "${kgen}" ] && return
  76
  77         tdir=$(mktemp -d); chmod 0700 "${tdir}"
  78
  79         kcount=0
  80         for ktype in ${kgen}; do
  81                 tfile="${tdir}/dropbear_${ktype}_host_key"
  82
  83                 if ! _dropbearkey -t ${ktype} -f "${tfile}"; then
  84                         # unsupported key type
  85                         rm -f "${tfile}"
  86                         continue
  87                 fi
  88
  89                 kcount=$((kcount+1))
  90         done
  91
  92         if [ ${kcount} -ne 0 ]; then
  93                 tlock='/tmp/.switch2jffs'
  94                 lock "${tlock}"
  95                 mkdir -p "${kdir}"; chmod 0700 "${kdir}"; chown root "${kdir}"
  96                 mv -f "${tdir}/"* "${kdir}/"
  97                 lock -u "${tlock}"
  98         fi
  99
 100         rm -rf "${tdir}"
 101 }
 102
 103 append_ports()
 104 {
 105         local ipaddrs="$1"
 106         local port="$2"
 107
 108         [ -z "$ipaddrs" ] && {
 109                 procd_append_param command -p "$port"
 110                 return
 111         }
 112
 113         for addr in $ipaddrs; do
 114                 procd_append_param command -p "$addr:$port"
 115         done
 116 }
 117
 118 validate_section_dropbear()
 119 {
 120         uci_validate_section dropbear dropbear "${1}" \
 121                 'PasswordAuth:bool:1' \
 122                 'enable:bool:1' \
 123                 'Interface:string' \
 124                 'GatewayPorts:bool:0' \
 125                 'RootPasswordAuth:bool:1' \
 126                 'RootLogin:bool:1' \
 127                 'rsakeyfile:file' \
 128                 'keyfile:list(file)' \
 129                 'BannerFile:file' \
 130                 'Port:port:22' \
 131                 'SSHKeepAlive:uinteger:300' \
 132                 'IdleTimeout:uinteger:0' \
 133                 'MaxAuthTries:uinteger:3' \
 134                 'RecvWindowSize:uinteger:0' \
 135                 'mdns:bool:1'
 136 }
 137
 138 dropbear_instance()
 139 {
 140         local PasswordAuth enable Interface GatewayPorts \
 141                 RootPasswordAuth RootLogin rsakeyfile keyfile \
 142                 BannerFile Port SSHKeepAlive IdleTimeout \
 143                 MaxAuthTries RecvWindowSize mdns ipaddrs
 144
 145         validate_section_dropbear "${1}" || {
 146                 echo "validation failed"
 147                 return 1
 148         }
 149
 150         [ -n "${Interface}" ] && {
 151                 network_get_ipaddrs_all ipaddrs "${Interface}" || {
 152                         echo "interface ${Interface} has no physdev or physdev has no suitable ip"
 153                         return 1
 154                 }
 155         }
 156
 157         [ "${enable}" = "0" ] && return 1
 158         PIDCOUNT="$(( ${PIDCOUNT} + 1))"
 159         local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
 160
 161         procd_open_instance
 162         procd_set_param command "$PROG" -F -P "$pid_file"
 163         [ "${PasswordAuth}" -eq 0 ] && procd_append_param command -s
 164         [ "${GatewayPorts}" -eq 1 ] && procd_append_param command -a
 165         [ "${RootPasswordAuth}" -eq 0 ] && procd_append_param command -g
 166         [ "${RootLogin}" -eq 0 ] && procd_append_param command -w
 167         if [ -n "${rsakeyfile}" ]; then
 168                 logger -t ${NAME} -p daemon.warn \
 169                         "option 'rsakeyfile' is considered to be deprecated and" \
 170                         "will be removed in future releases, use 'keyfile' instead"
 171                 hk_config 'rsakeyfile' "${rsakeyfile}"
 172         fi
 173         config_list_foreach "$1" "keyfile" hk_config__keyfile
 174         [ -n "${BannerFile}" ] && procd_append_param command -b "${BannerFile}"
 175         append_ports "${ipaddrs}" "${Port}"
 176         [ "${IdleTimeout}" -ne 0 ] && procd_append_param command -I "${IdleTimeout}"
 177         [ "${SSHKeepAlive}" -ne 0 ] && procd_append_param command -K "${SSHKeepAlive}"
 178         [ "${MaxAuthTries}" -ne 0 ] && procd_append_param command -T "${MaxAuthTries}"
 179         [ "${RecvWindowSize}" -gt 0 -a "${RecvWindowSize}" -le 1048576 ] && \
 180                 procd_append_param command -W "${RecvWindowSize}"
 181         [ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
 182         procd_set_param respawn
 183         procd_close_instance
 184 }
 185
 186 load_interfaces()
 187 {
 188         config_get interface "$1" Interface
 189         config_get enable "$1" enable 1
 190
 191         [ "${enable}" = "1" ] && interfaces=" ${interface} ${interfaces}"
 192 }
 193
 194 start_service()
 195 {
 196         hk_generate_as_needed
 197
 198         . /lib/functions.sh
 199         . /lib/functions/network.sh
 200
 201         config_load "${NAME}"
 202         config_foreach dropbear_instance dropbear
 203 }
 204
 205 service_triggers()
 206 {
 207         local interfaces
 208
 209         procd_add_config_trigger "config.change" "dropbear" /etc/init.d/dropbear reload
 210
 211         config_load "${NAME}"
 212         config_foreach load_interfaces dropbear
 213
 214         [ -n "${interfaces}" ] && {
 215                 for n in $interfaces ; do
 216                         procd_add_interface_trigger "interface.*" $n /etc/init.d/dropbear reload
 217                 done
 218         }
 219
 220         procd_add_validation validate_section_dropbear
 221 }
 222
 223 shutdown() {
 224         # close all open connections
 225         killall dropbear
 226 }
 227
 228 killclients()
 229 {
 230         local ignore=''
 231         local server
 232         local pid
 233
 234         # if this script is run from inside a client session, then ignore that session
 235         pid="$$"
 236         while [ "${pid}" -ne 0 ]
 237          do
 238                 # get parent process id
 239                 pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
 240                 [ "${pid}" -eq 0 ] && break
 241
 242                 # check if client connection
 243                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
 244                         append ignore "${pid}"
 245                         break
 246                 }
 247         done
 248
 249         # get all server pids that should be ignored
 250         for server in `cat /var/run/${NAME}.*.pid`
 251          do
 252                 append ignore "${server}"
 253         done
 254
 255         # get all running pids and kill client connections
 256         local skip
 257         for pid in `pidof "${NAME}"`
 258          do
 259                 # check if correct program, otherwise process next pid
 260                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
 261                         continue
 262                 }
 263
 264                 # check if pid should be ignored (servers, ourself)
 265                 skip=0
 266                 for server in ${ignore}
 267                  do
 268                         if [ "${pid}" = "${server}" ]
 269                          then
 270                                 skip=1
 271                                 break
 272                         fi
 273                 done
 274                 [ "${skip}" -ne 0 ] && continue
 275
 276                 # kill process
 277                 echo "${initscript}: Killing ${pid}..."
 278                 kill -KILL ${pid}
 279         done
 280 }