Initial commit
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domenico
282
package/network/services/dropbear/files/dropbear.init
Executable file
282
package/network/services/dropbear/files/dropbear.init
Executable file
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#!/bin/sh /etc/rc.common
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# Copyright (C) 2006-2010 OpenWrt.org
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# Copyright (C) 2006 Carlos Sobrinho
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START=19
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STOP=50
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USE_PROCD=1
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PROG=/usr/sbin/dropbear
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NAME=dropbear
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PIDCOUNT=0
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extra_command "killclients" "Kill ${NAME} processes except servers and yourself"
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_dropbearkey()
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{
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/usr/bin/dropbearkey "$@" 0<&- 1>&- 2>&-
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}
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# $1 - host key file name
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hk_verify()
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{
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[ -f "$1" ] || return 1
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[ -s "$1" ] || return 2
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_dropbearkey -y -f "$1" || return 3
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return 0
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}
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# $1 - hk_verify() return code
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hk_errmsg()
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{
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case "$1" in
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0) ;;
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1) echo "file does not exist" ;;
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2) echo "file has zero length" ;;
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3) echo "file is not valid host key or not supported" ;;
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*) echo "unknown error" ;;
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esac
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}
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# $1 - config option
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# $2 - host key file name
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hk_config()
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{
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local x m
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hk_verify "$2"; x=$?
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case "$x" in
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0) procd_append_param command -r "$2"
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;;
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*) m=$(hk_errmsg "$x")
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logger -t "${NAME}" -p daemon.warn \
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"option '$1', value '$2': $m, skipping"
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;;
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esac
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}
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# $1 - host key file name
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hk_config__keyfile()
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{
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hk_config 'keyfile' "$1"
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}
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hk_generate_as_needed()
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{
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local kdir kgen ktype tdir kcount tfile
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kdir='/etc/dropbear'
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kgen=''
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for ktype in ed25519 ecdsa rsa; do
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hk_verify "${kdir}/dropbear_${ktype}_host_key" && continue
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kgen="${kgen} ${ktype}"
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done
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[ -z "${kgen}" ] && return
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tdir=$(mktemp -d); chmod 0700 "${tdir}"
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kcount=0
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for ktype in ${kgen}; do
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tfile="${tdir}/dropbear_${ktype}_host_key"
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if ! _dropbearkey -t ${ktype} -f "${tfile}"; then
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# unsupported key type
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rm -f "${tfile}"
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continue
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fi
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kcount=$((kcount+1))
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done
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if [ ${kcount} -ne 0 ]; then
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mkdir -p "${kdir}"; chmod 0700 "${kdir}"; chown root "${kdir}"
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mv -f "${tdir}/"* "${kdir}/"
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fi
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rm -rf "${tdir}"
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}
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append_ports()
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{
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local ipaddrs="$1"
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local port="$2"
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[ -z "$ipaddrs" ] && {
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procd_append_param command -p "$port"
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return
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}
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for addr in $ipaddrs; do
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procd_append_param command -p "$addr:$port"
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done
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}
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validate_section_dropbear()
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{
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uci_load_validate dropbear dropbear "$1" "$2" \
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'PasswordAuth:bool:1' \
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'enable:bool:1' \
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'Interface:string' \
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'GatewayPorts:bool:0' \
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'RootPasswordAuth:bool:1' \
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'RootLogin:bool:1' \
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'rsakeyfile:file' \
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'keyfile:list(file)' \
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'BannerFile:file' \
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'Port:port:22' \
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'SSHKeepAlive:uinteger:300' \
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'IdleTimeout:uinteger:0' \
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'MaxAuthTries:uinteger:3' \
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'RecvWindowSize:uinteger:0' \
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'mdns:bool:1'
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}
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dropbear_instance()
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{
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local ipaddrs
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[ "$2" = 0 ] || {
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echo "validation failed"
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return 1
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}
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[ -n "${Interface}" ] && {
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[ -n "${BOOT}" ] && return 0
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network_get_ipaddrs_all ipaddrs "${Interface}" || {
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echo "interface ${Interface} has no physdev or physdev has no suitable ip"
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return 1
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}
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}
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[ "${enable}" = "0" ] && return 1
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PIDCOUNT="$(( ${PIDCOUNT} + 1))"
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local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
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procd_open_instance
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procd_set_param command "$PROG" -F -P "$pid_file"
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[ "${PasswordAuth}" -eq 0 ] && procd_append_param command -s
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[ "${GatewayPorts}" -eq 1 ] && procd_append_param command -a
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[ "${RootPasswordAuth}" -eq 0 ] && procd_append_param command -g
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[ "${RootLogin}" -eq 0 ] && procd_append_param command -w
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if [ -n "${rsakeyfile}" ]; then
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logger -t ${NAME} -p daemon.warn \
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"option 'rsakeyfile' is considered to be deprecated and" \
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"will be removed in future releases, use 'keyfile' instead"
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hk_config 'rsakeyfile' "${rsakeyfile}"
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fi
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config_list_foreach "$1" "keyfile" hk_config__keyfile
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[ -n "${BannerFile}" ] && procd_append_param command -b "${BannerFile}"
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append_ports "${ipaddrs}" "${Port}"
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[ "${IdleTimeout}" -ne 0 ] && procd_append_param command -I "${IdleTimeout}"
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[ "${SSHKeepAlive}" -ne 0 ] && procd_append_param command -K "${SSHKeepAlive}"
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[ "${MaxAuthTries}" -ne 0 ] && procd_append_param command -T "${MaxAuthTries}"
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[ "${RecvWindowSize}" -gt 0 -a "${RecvWindowSize}" -le 1048576 ] && \
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procd_append_param command -W "${RecvWindowSize}"
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[ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
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procd_set_param respawn
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procd_close_instance
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}
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load_interfaces()
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{
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config_get interface "$1" Interface
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config_get enable "$1" enable 1
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[ "${enable}" = "1" ] && interfaces=" ${interface} ${interfaces}"
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}
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boot()
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{
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BOOT=1
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start "$@"
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}
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start_service()
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{
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hk_generate_as_needed
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. /lib/functions.sh
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. /lib/functions/network.sh
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config_load "${NAME}"
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config_foreach validate_section_dropbear dropbear dropbear_instance
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}
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service_triggers()
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{
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local interfaces
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procd_add_config_trigger "config.change" "dropbear" /etc/init.d/dropbear reload
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config_load "${NAME}"
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config_foreach load_interfaces dropbear
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[ -n "${interfaces}" ] && {
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for n in $interfaces ; do
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procd_add_interface_trigger "interface.*" $n /etc/init.d/dropbear reload
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done
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}
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procd_add_validation validate_section_dropbear
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}
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shutdown() {
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# close all open connections
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killall dropbear
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}
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killclients()
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{
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local ignore=''
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local server
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local pid
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# if this script is run from inside a client session, then ignore that session
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pid="$$"
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while [ "${pid}" -ne 0 ]
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do
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# get parent process id
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pid=$(cut -d ' ' -f 4 "/proc/${pid}/stat")
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[ "${pid}" -eq 0 ] && break
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# check if client connection
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grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
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append ignore "${pid}"
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break
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}
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done
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# get all server pids that should be ignored
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for server in $(cat /var/run/${NAME}.*.pid)
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do
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append ignore "${server}"
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done
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# get all running pids and kill client connections
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local skip
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for pid in $(pidof "${NAME}")
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do
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# check if correct program, otherwise process next pid
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grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
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continue
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}
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# check if pid should be ignored (servers, ourself)
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skip=0
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for server in ${ignore}
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do
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if [ "${pid}" = "${server}" ]
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then
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skip=1
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break
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fi
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done
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[ "${skip}" -ne 0 ] && continue
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# kill process
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echo "${initscript}: Killing ${pid}..."
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kill -KILL ${pid}
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done
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}
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