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
  13 extra_command "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' "$1"
  61 }
  62
  63 hk_generate_as_needed()
  64 {
  65         local kdir kgen ktype tdir kcount tfile
  66         kdir='/etc/dropbear'
  67
  68         kgen=''
  69         for ktype in ed25519 ecdsa rsa; do
  70                 hk_verify "${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 [ ${kcount} -ne 0 ]; then
  93                 mkdir -p "${kdir}"; chmod 0700 "${kdir}"; chown root "${kdir}"
  94                 mv -f "${tdir}/"* "${kdir}/"
  95         fi
  96
  97         rm -rf "${tdir}"
  98 }
  99
 100 append_ports()
 101 {
 102         local ipaddrs="$1"
 103         local port="$2"
 104
 105         [ -z "$ipaddrs" ] && {
 106                 procd_append_param command -p "$port"
 107                 return
 108         }
 109
 110         for addr in $ipaddrs; do
 111                 procd_append_param command -p "$addr:$port"
 112         done
 113 }
 114
 115 validate_section_dropbear()
 116 {
 117         uci_load_validate dropbear dropbear "$1" "$2" \
 118                 'PasswordAuth:bool:1' \
 119                 'enable:bool:1' \
 120                 'Interface:string' \
 121                 'GatewayPorts:bool:0' \
 122                 'ForceCommand:string' \
 123                 'RootPasswordAuth:bool:1' \
 124                 'RootLogin:bool:1' \
 125                 'rsakeyfile:file' \
 126                 'keyfile:list(file)' \
 127                 'BannerFile:file' \
 128                 'Port:port:22' \
 129                 'SSHKeepAlive:uinteger:300' \
 130                 'IdleTimeout:uinteger:0' \
 131                 'MaxAuthTries:uinteger:3' \
 132                 'RecvWindowSize:uinteger:0' \
 133                 'mdns:bool:1'
 134 }
 135
 136 dropbear_instance()
 137 {
 138         local ipaddrs
 139
 140         [ "$2" = 0 ] || {
 141                 echo "validation failed"
 142                 return 1
 143         }
 144
 145         [ -n "${Interface}" ] && {
 146                 [ -n "${BOOT}" ] && return 0
 147
 148                 network_get_ipaddrs_all ipaddrs "${Interface}" || {
 149                         echo "interface ${Interface} has no physdev or physdev has no suitable ip"
 150                         return 1
 151                 }
 152         }
 153
 154         [ "${enable}" = "0" ] && return 1
 155         PIDCOUNT="$(( ${PIDCOUNT} + 1))"
 156         local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
 157
 158         # Increase default receive window size to increase
 159         # throughput on high latency links
 160         if [ "${RecvWindowSize}" -eq "0" ]; then
 161                 RecvWindowSize="262144"
 162         fi
 163
 164         procd_open_instance
 165         procd_set_param command "$PROG" -F -P "$pid_file"
 166         [ "${PasswordAuth}" -eq 0 ] && procd_append_param command -s
 167         [ "${GatewayPorts}" -eq 1 ] && procd_append_param command -a
 168         [ -n "${ForceCommand}" ] && procd_append_param command -c "${ForceCommand}"
 169         [ "${RootPasswordAuth}" -eq 0 ] && procd_append_param command -g
 170         [ "${RootLogin}" -eq 0 ] && procd_append_param command -w
 171         if [ -n "${rsakeyfile}" ]; then
 172                 logger -t ${NAME} -p daemon.warn \
 173                         "option 'rsakeyfile' is considered to be deprecated and" \
 174                         "will be removed in future releases, use 'keyfile' instead"
 175                 hk_config 'rsakeyfile' "${rsakeyfile}"
 176         fi
 177         config_list_foreach "$1" "keyfile" hk_config__keyfile
 178         [ -n "${BannerFile}" ] && procd_append_param command -b "${BannerFile}"
 179         append_ports "${ipaddrs}" "${Port}"
 180         [ "${IdleTimeout}" -ne 0 ] && procd_append_param command -I "${IdleTimeout}"
 181         [ "${SSHKeepAlive}" -ne 0 ] && procd_append_param command -K "${SSHKeepAlive}"
 182         [ "${MaxAuthTries}" -ne 0 ] && procd_append_param command -T "${MaxAuthTries}"
 183         [ "${RecvWindowSize}" -gt 0 -a "${RecvWindowSize}" -le 1048576 ] && \
 184                 procd_append_param command -W "${RecvWindowSize}"
 185         [ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
 186         procd_set_param respawn
 187         procd_close_instance
 188 }
 189
 190 load_interfaces()
 191 {
 192         config_get interface "$1" Interface
 193         config_get enable "$1" enable 1
 194
 195         [ "${enable}" = "1" ] && interfaces=" ${interface} ${interfaces}"
 196 }
 197
 198 boot()
 199 {
 200         BOOT=1
 201         start "$@"
 202 }
 203
 204 start_service()
 205 {
 206         hk_generate_as_needed
 207
 208         . /lib/functions.sh
 209         . /lib/functions/network.sh
 210
 211         config_load "${NAME}"
 212         config_foreach validate_section_dropbear dropbear dropbear_instance
 213 }
 214
 215 service_triggers()
 216 {
 217         local interfaces
 218
 219         procd_add_config_trigger "config.change" "dropbear" /etc/init.d/dropbear reload
 220
 221         config_load "${NAME}"
 222         config_foreach load_interfaces dropbear
 223
 224         [ -n "${interfaces}" ] && {
 225                 for n in $interfaces ; do
 226                         procd_add_interface_trigger "interface.*" $n /etc/init.d/dropbear reload
 227                 done
 228         }
 229
 230         procd_add_validation validate_section_dropbear
 231 }
 232
 233 shutdown() {
 234         # close all open connections
 235         killall dropbear
 236 }
 237
 238 killclients()
 239 {
 240         local ignore=''
 241         local server
 242         local pid
 243
 244         # if this script is run from inside a client session, then ignore that session
 245         pid="$$"
 246         while [ "${pid}" -ne 0 ]
 247          do
 248                 # get parent process id
 249                 pid=$(cut -d ' ' -f 4 "/proc/${pid}/stat")
 250                 [ "${pid}" -eq 0 ] && break
 251
 252                 # check if client connection
 253                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
 254                         append ignore "${pid}"
 255                         break
 256                 }
 257         done
 258
 259         # get all server pids that should be ignored
 260         for server in $(cat /var/run/${NAME}.*.pid)
 261          do
 262                 append ignore "${server}"
 263         done
 264
 265         # get all running pids and kill client connections
 266         local skip
 267         for pid in $(pidof "${NAME}")
 268          do
 269                 # check if correct program, otherwise process next pid
 270                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
 271                         continue
 272                 }
 273
 274                 # check if pid should be ignored (servers, ourself)
 275                 skip=0
 276                 for server in ${ignore}
 277                  do
 278                         if [ "${pid}" = "${server}" ]
 279                          then
 280                                 skip=1
 281                                 break
 282                         fi
 283                 done
 284                 [ "${skip}" -ne 0 ] && continue
 285
 286                 # kill process
 287                 echo "${initscript}: Killing ${pid}..."
 288                 kill -KILL ${pid}
 289         done
 290 }