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                 '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 PasswordAuth enable Interface GatewayPorts \
  52                 RootPasswordAuth RootLogin rsakeyfile \
  53                 BannerFile Port SSHKeepAlive IdleTimeout \
  54                 MaxAuthTries RecvWindowSize mdns ipaddrs
  55
  56         validate_section_dropbear "${1}" || {
  57                 echo "validation failed"
  58                 return 1
  59         }
  60
  61         [ -n "${Interface}" ] && {
  62                 network_get_ipaddrs_all ipaddrs "${Interface}" || {
  63                         echo "interface ${Interface} has no physdev or physdev has no suitable ip"
  64                         return 1
  65                 }
  66         }
  67
  68         [ "${enable}" = "0" ] && return 1
  69         PIDCOUNT="$(( ${PIDCOUNT} + 1))"
  70         local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
  71
  72         procd_open_instance
  73         procd_set_param command "$PROG" -F -P "$pid_file"
  74         [ "${PasswordAuth}" -eq 0 ] && procd_append_param command -s
  75         [ "${GatewayPorts}" -eq 1 ] && procd_append_param command -a
  76         [ "${RootPasswordAuth}" -eq 0 ] && procd_append_param command -g
  77         [ "${RootLogin}" -eq 0 ] && procd_append_param command -w
  78         [ -n "${rsakeyfile}" ] && procd_append_param command -r "${rsakeyfile}"
  79         [ -n "${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 "${SSHKeepAlive}"
  83         [ "${MaxAuthTries}" -ne 0 ] && procd_append_param command -T "${MaxAuthTries}"
  84         [ "${RecvWindowSize}" -gt 0 -a "${RecvWindowSize}" -le 1048576 ] && \
  85                 procd_append_param command -W "${RecvWindowSize}"
  86         [ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
  87         procd_set_param respawn
  88         procd_close_instance
  89 }
  90
  91 keygen()
  92 {
  93         for keytype in rsa; do
  94                 # check for keys
  95                 key=dropbear/dropbear_${keytype}_host_key
  96                 [ -f /tmp/$key -o -s /etc/$key ] || {
  97                         # generate missing keys
  98                         mkdir -p /tmp/dropbear
  99                         [ -x /usr/bin/dropbearkey ] && {
 100                                 /usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
 101                         } &
 102                 exit 0
 103                 }
 104         done
 105
 106         lock /tmp/.switch2jffs
 107         mkdir -p /etc/dropbear
 108         mv /tmp/dropbear/dropbear_* /etc/dropbear/
 109         lock -u /tmp/.switch2jffs
 110         chown root /etc/dropbear
 111         chmod 0700 /etc/dropbear
 112 }
 113
 114 load_interfaces()
 115 {
 116         config_get interface "$1" Interface
 117         config_get enable "$1" enable 1
 118
 119         [ "${enable}" = "1" ] && interfaces=" ${interface} ${interfaces}"
 120 }
 121
 122 start_service()
 123 {
 124         [ -s /etc/dropbear/dropbear_rsa_host_key ] || keygen
 125
 126         . /lib/functions.sh
 127         . /lib/functions/network.sh
 128
 129         config_load "${NAME}"
 130         config_foreach dropbear_instance dropbear
 131 }
 132
 133 service_triggers()
 134 {
 135         local interfaces
 136
 137         procd_add_config_trigger "config.change" "dropbear" /etc/init.d/dropbear reload
 138
 139         config_load "${NAME}"
 140         config_foreach load_interfaces dropbear
 141
 142         [ -n "${interfaces}" ] && {
 143                 for n in $interfaces ; do
 144                         procd_add_interface_trigger "interface.*" $n /etc/init.d/dropbear reload
 145                 done
 146         }
 147
 148         procd_add_validation validate_section_dropbear
 149 }
 150
 151 killclients()
 152 {
 153         local ignore=''
 154         local server
 155         local pid
 156
 157         # if this script is run from inside a client session, then ignore that session
 158         pid="$$"
 159         while [ "${pid}" -ne 0 ]
 160          do
 161                 # get parent process id
 162                 pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
 163                 [ "${pid}" -eq 0 ] && break
 164
 165                 # check if client connection
 166                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
 167                         append ignore "${pid}"
 168                         break
 169                 }
 170         done
 171
 172         # get all server pids that should be ignored
 173         for server in `cat /var/run/${NAME}.*.pid`
 174          do
 175                 append ignore "${server}"
 176         done
 177
 178         # get all running pids and kill client connections
 179         local skip
 180         for pid in `pidof "${NAME}"`
 181          do
 182                 # check if correct program, otherwise process next pid
 183                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
 184                         continue
 185                 }
 186
 187                 # check if pid should be ignored (servers, ourself)
 188                 skip=0
 189                 for server in ${ignore}
 190                  do
 191                         if [ "${pid}" = "${server}" ]
 192                          then
 193                                 skip=1
 194                                 break
 195                         fi
 196                 done
 197                 [ "${skip}" -ne 0 ] && continue
 198
 199                 # kill process
 200                 echo "${initscript}: Killing ${pid}..."
 201                 kill -KILL ${pid}
 202         done
 203 }