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This commit is contained in:
domenico
474
package/network/services/dropbear/files/dropbear.init
Executable file
474
package/network/services/dropbear/files/dropbear.init
Executable file
@@ -0,0 +1,474 @@
|
||||
#!/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 ${NAME} processes except servers and yourself"
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|
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# most of time real_stat() will be failing
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# due to missing "stat" binary (by default)
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real_stat() { env stat -L "$@" 2>/dev/null ; }
|
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dumb_stat() { ls -Ldln "$1" | tr -s '\t ' ' ' ; }
|
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stat_perm() { real_stat -c '%A' "$1" || dumb_stat "$1" | cut -d ' ' -f 1 ; }
|
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stat_owner() { real_stat -c '%u' "$1" || dumb_stat "$1" | cut -d ' ' -f 3 ; }
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_dropbearkey()
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{
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/usr/bin/dropbearkey "$@" </dev/null >/dev/null 2>&1
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}
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# $1 - file name (host key or config)
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file_verify()
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{
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[ -f "$1" ] || return 1
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# checking file ownership
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[ "$(stat_owner "$1")" = "0" ] || {
|
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chown 0 "$1"
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[ "$(stat_owner "$1")" = "0" ] || return 2
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}
|
||||
# checking file permissions
|
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[ "$(stat_perm "$1")" = "-rw-------" ] || {
|
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chmod 0600 "$1"
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[ "$(stat_perm "$1")" = "-rw-------" ] || return 3
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}
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# file is host key or not?
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# if $2 is empty string - file is "host key"
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# if $2 is non-empty string - file is "config"
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[ -z "$2" ] || return 0
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# checking file contents (finally)
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[ -s "$1" ] || return 4
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_dropbearkey -y -f "$1" || return 5
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return 0
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}
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# $1 - file_verify() return code
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file_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 wrong owner (must be owned by root)" ;;
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3) echo "file has wrong permissions (must not have group/other write bit)" ;;
|
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4) echo "file has zero length" ;;
|
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5) 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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}
|
||||
|
||||
# $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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file_verify "$2" ; x=$?
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if [ "$x" = 0 ] ; then
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procd_append_param command -r "$2"
|
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return
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fi
|
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m=$(file_errmsg "$x")
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logger -s -t "${NAME}" -p daemon.warn \
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"Option '$1', skipping '$2': $m"
|
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}
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|
||||
# $1 - host key file name
|
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hk_config__keyfile() { hk_config keyfile "$1" ; }
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|
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ktype_all='ed25519 ecdsa rsa'
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hk_generate_as_needed()
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{
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local hk_cfg_dir kgen ktype kfile hk_tmp_dir
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hk_cfg_dir='/etc/dropbear'
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[ -d "${hk_cfg_dir}" ] || mkdir -p "${hk_cfg_dir}"
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|
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kgen=
|
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for ktype in ${ktype_all} ; do
|
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kfile="${hk_cfg_dir}/dropbear_${ktype}_host_key"
|
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|
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if file_verify "${kfile}" ; then continue ; fi
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kgen="${kgen}${kgen:+ }${ktype}"
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done
|
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|
||||
# all keys are sane?
|
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[ -n "${kgen}" ] || return 0
|
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|
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hk_tmp_dir=$(mktemp -d)
|
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# system in bad state?
|
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[ -n "${hk_tmp_dir}" ] || return 1
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|
||||
chmod 0700 "${hk_tmp_dir}"
|
||||
|
||||
for ktype in ${kgen} ; do
|
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kfile="${hk_tmp_dir}/dropbear_${ktype}_host_key"
|
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|
||||
if ! _dropbearkey -t ${ktype} -f "${kfile}" ; then
|
||||
# unsupported key type
|
||||
rm -f "${kfile}"
|
||||
continue
|
||||
fi
|
||||
|
||||
chmod 0600 "${kfile}"
|
||||
done
|
||||
|
||||
kgen=
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for ktype in ${ktype_all} ; do
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kfile="${hk_tmp_dir}/dropbear_${ktype}_host_key"
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|
||||
[ -s "${kfile}" ] || continue
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||||
|
||||
kgen="${kgen}${kgen:+ }${ktype}"
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done
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|
||||
if [ -n "${kgen}" ] ; then
|
||||
for ktype in ${kgen} ; do
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kfile="${hk_tmp_dir}/dropbear_${ktype}_host_key"
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[ -s "${kfile}" ] || continue
|
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mv -f "${kfile}" "${hk_cfg_dir}/"
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||||
done
|
||||
fi
|
||||
|
||||
rm -rf "${hk_tmp_dir}"
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|
||||
# cleanup empty files
|
||||
for ktype in ${ktype_all} ; do
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||||
kfile="${hk_cfg_dir}/dropbear_${ktype}_host_key"
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||||
[ -s "${kfile}" ] || rm -f "${kfile}"
|
||||
done
|
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}
|
||||
|
||||
# $1 - list with whitespace-separated elements
|
||||
normalize_list()
|
||||
{
|
||||
printf '%s' "$1" | tr -s ' \r\n\t' ' ' | sed -E 's/^ //;s/ $//'
|
||||
}
|
||||
|
||||
warn_multiple_interfaces()
|
||||
{
|
||||
logger -t "${NAME}" -p daemon.warn \
|
||||
"Option '$1' should specify SINGLE interface but instead it lists interfaces: $2"
|
||||
logger -t "${NAME}" -p daemon.warn \
|
||||
"Consider creating per-interface instances instead!"
|
||||
}
|
||||
|
||||
validate_section_dropbear()
|
||||
{
|
||||
uci_load_validate dropbear dropbear "$1" "$2" \
|
||||
'PasswordAuth:bool:1' \
|
||||
'enable:bool:1' \
|
||||
'DirectInterface:string' \
|
||||
'Interface:string' \
|
||||
'GatewayPorts:bool:0' \
|
||||
'ForceCommand:string' \
|
||||
'RootPasswordAuth:bool:1' \
|
||||
'RootLogin:bool:1' \
|
||||
'rsakeyfile:file' \
|
||||
'keyfile:list(file)' \
|
||||
'BannerFile:file' \
|
||||
'Port:port:22' \
|
||||
'SSHKeepAlive:uinteger:300' \
|
||||
'IdleTimeout:uinteger:0' \
|
||||
'MaxAuthTries:uinteger:3' \
|
||||
'RecvWindowSize:uinteger:262144' \
|
||||
'mdns:bool:1'
|
||||
}
|
||||
|
||||
dropbear_instance()
|
||||
{
|
||||
[ "$2" = 0 ] || {
|
||||
echo "validation failed"
|
||||
return 1
|
||||
}
|
||||
|
||||
[ "${enable}" = "1" ] || return 1
|
||||
|
||||
local iface ndev ipaddrs
|
||||
|
||||
# 'DirectInterface' should specify single interface
|
||||
# but end users may misinterpret this setting
|
||||
DirectInterface=$(normalize_list "${DirectInterface}")
|
||||
|
||||
# 'Interface' should specify single interface
|
||||
# but end users are often misinterpret this setting
|
||||
Interface=$(normalize_list "${Interface}")
|
||||
|
||||
if [ -n "${Interface}" ] ; then
|
||||
if [ -n "${DirectInterface}" ] ; then
|
||||
logger -t "${NAME}" -p daemon.warn \
|
||||
"Option 'DirectInterface' takes precedence over 'Interface'"
|
||||
else
|
||||
logger -t "${NAME}" -p daemon.info \
|
||||
"Option 'Interface' binds to address(es) but not to interface"
|
||||
logger -t "${NAME}" -p daemon.info \
|
||||
"Consider using option 'DirectInterface' to bind directly to interface"
|
||||
fi
|
||||
fi
|
||||
|
||||
# handle 'DirectInterface'
|
||||
iface=$(echo "${DirectInterface}" | awk '{print $1}')
|
||||
case "${DirectInterface}" in
|
||||
*\ *)
|
||||
warn_multiple_interfaces DirectInterface "${DirectInterface}"
|
||||
logger -t "${NAME}" -p daemon.warn \
|
||||
"Using network interface '${iface}' for direct binding"
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||||
;;
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||||
esac
|
||||
while [ -n "${iface}" ] ; do
|
||||
# if network is available (even during boot) - proceed
|
||||
if network_is_up "${iface}" ; then break ; fi
|
||||
# skip during boot
|
||||
[ -z "${BOOT}" ] || return 0
|
||||
|
||||
logger -t "${NAME}" -p daemon.crit \
|
||||
"Network interface '${iface}' is not available!"
|
||||
return 1
|
||||
done
|
||||
while [ -n "${iface}" ] ; do
|
||||
# ${iface} is logical (higher level) interface name
|
||||
# ${ndev} is 'real' interface name
|
||||
# e.g.: if ${iface} is 'lan' (default LAN interface) then ${ndev} is 'br-lan'
|
||||
network_get_device ndev "${iface}"
|
||||
[ -z "${ndev}" ] || break
|
||||
|
||||
logger -t "${NAME}" -p daemon.crit \
|
||||
"Missing network device for network interface '${iface}'!"
|
||||
return 1
|
||||
done
|
||||
if [ -n "${iface}" ] ; then
|
||||
logger -t "${NAME}" -p daemon.info \
|
||||
"Using network interface '${iface}' (network device '${ndev}') for direct binding"
|
||||
fi
|
||||
# handle 'Interface'
|
||||
while [ -z "${iface}" ] ; do
|
||||
[ -n "${Interface}" ] || break
|
||||
|
||||
# skip during boot
|
||||
[ -z "${BOOT}" ] || return 0
|
||||
|
||||
case "${Interface}" in
|
||||
*\ *)
|
||||
warn_multiple_interfaces Interface "${Interface}"
|
||||
;;
|
||||
esac
|
||||
|
||||
local c=0
|
||||
# src/sysoptions.h
|
||||
local DROPBEAR_MAX_PORTS=10
|
||||
|
||||
local a n if_ipaddrs
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for n in ${Interface} ; do
|
||||
[ -n "$n" ] || continue
|
||||
|
||||
if_ipaddrs=
|
||||
network_get_ipaddrs_all if_ipaddrs "$n"
|
||||
[ -n "${if_ipaddrs}" ] || {
|
||||
logger -s -t "${NAME}" -p daemon.err \
|
||||
"Network interface '$n' has no suitable IP address(es)!"
|
||||
continue
|
||||
}
|
||||
|
||||
[ $c -le ${DROPBEAR_MAX_PORTS} ] || {
|
||||
logger -s -t "${NAME}" -p daemon.err \
|
||||
"Network interface '$n' is NOT listened due to option limit exceed!"
|
||||
continue
|
||||
}
|
||||
|
||||
for a in ${if_ipaddrs} ; do
|
||||
[ -n "$a" ] || continue
|
||||
|
||||
c=$((c+1))
|
||||
if [ $c -le ${DROPBEAR_MAX_PORTS} ] ; then
|
||||
ipaddrs="${ipaddrs} $a"
|
||||
continue
|
||||
fi
|
||||
|
||||
logger -t "${NAME}" -p daemon.err \
|
||||
"Endpoint '$a:${Port}' on network interface '$n' is NOT listened due to option limit exceed!"
|
||||
done
|
||||
done
|
||||
break
|
||||
done
|
||||
|
||||
PIDCOUNT="$(( ${PIDCOUNT} + 1))"
|
||||
local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
|
||||
|
||||
procd_open_instance
|
||||
procd_set_param command "$PROG" -F -P "$pid_file"
|
||||
if [ -n "${iface}" ] ; then
|
||||
# if ${iface} is non-empty then ${ndev} is non-empty too
|
||||
procd_append_param command -l "${ndev}" -p "${Port}"
|
||||
else
|
||||
if [ -z "${ipaddrs}" ] ; then
|
||||
procd_append_param command -p "${Port}"
|
||||
else
|
||||
local a
|
||||
for a in ${ipaddrs} ; do
|
||||
[ -n "$a" ] || continue
|
||||
procd_append_param command -p "$a:${Port}"
|
||||
done
|
||||
fi
|
||||
fi
|
||||
[ "${PasswordAuth}" -eq 0 ] && procd_append_param command -s
|
||||
[ "${GatewayPorts}" -eq 1 ] && procd_append_param command -a
|
||||
[ -n "${ForceCommand}" ] && procd_append_param command -c "${ForceCommand}"
|
||||
[ "${RootPasswordAuth}" -eq 0 ] && procd_append_param command -g
|
||||
[ "${RootLogin}" -eq 0 ] && procd_append_param command -w
|
||||
config_list_foreach "$1" 'keyfile' hk_config__keyfile
|
||||
if [ -n "${rsakeyfile}" ]; then
|
||||
logger -s -t "${NAME}" -p daemon.crit \
|
||||
"Option 'rsakeyfile' is considered to be DEPRECATED and will be REMOVED in future releases, use 'keyfile' list instead"
|
||||
sed -i.before-upgrade -E -e 's/option(\s+)rsakeyfile/list keyfile/' \
|
||||
"/etc/config/${NAME}"
|
||||
logger -s -t "${NAME}" -p daemon.crit \
|
||||
"Auto-transition 'option rsakeyfile' => 'list keyfile' in /etc/config/${NAME} is done, please verify your configuration"
|
||||
hk_config 'rsakeyfile' "${rsakeyfile}"
|
||||
fi
|
||||
[ -n "${BannerFile}" ] && procd_append_param command -b "${BannerFile}"
|
||||
[ "${IdleTimeout}" -ne 0 ] && procd_append_param command -I "${IdleTimeout}"
|
||||
[ "${SSHKeepAlive}" -ne 0 ] && procd_append_param command -K "${SSHKeepAlive}"
|
||||
[ "${MaxAuthTries}" -ne 0 ] && procd_append_param command -T "${MaxAuthTries}"
|
||||
[ "${RecvWindowSize}" -gt 0 ] && {
|
||||
# NB: OpenWrt increases receive window size to increase throughput on high latency links
|
||||
# ref: validate_section_dropbear()
|
||||
# default receive window size is 24576 (DEFAULT_RECV_WINDOW in default_options.h)
|
||||
|
||||
# src/sysoptions.h
|
||||
local MAX_RECV_WINDOW=10485760
|
||||
if [ "${RecvWindowSize}" -gt ${MAX_RECV_WINDOW} ] ; then
|
||||
# separate logging is required because syslog misses dropbear's message
|
||||
# Bad recv window '${RecvWindowSize}', using ${MAX_RECV_WINDOW}
|
||||
# it's probably dropbear issue but we should handle this and notify user
|
||||
logger -s -t "${NAME}" -p daemon.warn \
|
||||
"Option 'RecvWindowSize' is too high (${RecvWindowSize}), limiting to ${MAX_RECV_WINDOW}"
|
||||
RecvWindowSize=${MAX_RECV_WINDOW}
|
||||
fi
|
||||
procd_append_param command -W "${RecvWindowSize}"
|
||||
}
|
||||
[ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
|
||||
procd_set_param respawn
|
||||
procd_close_instance
|
||||
}
|
||||
|
||||
load_interfaces()
|
||||
{
|
||||
local enable
|
||||
config_get enable "$1" enable 1
|
||||
[ "${enable}" = "1" ] || return 0
|
||||
|
||||
local direct_iface iface
|
||||
config_get direct_iface "$1" DirectInterface
|
||||
direct_iface=$(normalize_list "${direct_iface}")
|
||||
# 'DirectInterface' takes precedence over 'Interface'
|
||||
if [ -n "${direct_iface}" ] ; then
|
||||
iface=$(echo "${direct_iface}" | awk '{print $1}')
|
||||
else
|
||||
config_get iface "$1" Interface
|
||||
iface=$(normalize_list "${iface}")
|
||||
fi
|
||||
interfaces="${interfaces} ${iface}"
|
||||
}
|
||||
|
||||
boot()
|
||||
{
|
||||
BOOT=1
|
||||
start "$@"
|
||||
}
|
||||
|
||||
start_service()
|
||||
{
|
||||
hk_generate_as_needed
|
||||
file_verify /etc/dropbear/authorized_keys config
|
||||
|
||||
. /lib/functions.sh
|
||||
. /lib/functions/network.sh
|
||||
|
||||
config_load "${NAME}"
|
||||
config_foreach validate_section_dropbear dropbear dropbear_instance
|
||||
}
|
||||
|
||||
service_triggers()
|
||||
{
|
||||
local interfaces
|
||||
|
||||
procd_add_config_trigger "config.change" "${NAME}" /etc/init.d/dropbear reload
|
||||
|
||||
config_load "${NAME}"
|
||||
config_foreach load_interfaces "${NAME}"
|
||||
|
||||
[ -n "${interfaces}" ] && {
|
||||
local n
|
||||
for n in $(printf '%s\n' ${interfaces} | sort -u) ; do
|
||||
procd_add_interface_trigger "interface.*" $n /etc/init.d/dropbear reload
|
||||
done
|
||||
}
|
||||
|
||||
procd_add_validation validate_section_dropbear
|
||||
}
|
||||
|
||||
shutdown() {
|
||||
# close all open connections
|
||||
killall dropbear
|
||||
}
|
||||
|
||||
killclients()
|
||||
{
|
||||
local ignore=''
|
||||
local server
|
||||
local pid
|
||||
|
||||
# if this script is run from inside a client session, then ignore that session
|
||||
pid="$$"
|
||||
while [ "${pid}" -ne 0 ]
|
||||
do
|
||||
# get parent process id
|
||||
pid=$(cut -d ' ' -f 4 "/proc/${pid}/stat")
|
||||
[ "${pid}" -eq 0 ] && break
|
||||
|
||||
# check if client connection
|
||||
grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
|
||||
append ignore "${pid}"
|
||||
break
|
||||
}
|
||||
done
|
||||
|
||||
# get all server pids that should be ignored
|
||||
for server in $(cat /var/run/${NAME}.*.pid)
|
||||
do
|
||||
append ignore "${server}"
|
||||
done
|
||||
|
||||
# get all running pids and kill client connections
|
||||
local skip
|
||||
for pid in $(pidof "${NAME}")
|
||||
do
|
||||
# check if correct program, otherwise process next pid
|
||||
grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
|
||||
continue
|
||||
}
|
||||
|
||||
# check if pid should be ignored (servers, ourself)
|
||||
skip=0
|
||||
for server in ${ignore}
|
||||
do
|
||||
if [ "${pid}" = "${server}" ]
|
||||
then
|
||||
skip=1
|
||||
break
|
||||
fi
|
||||
done
|
||||
[ "${skip}" -ne 0 ] && continue
|
||||
|
||||
# kill process
|
||||
echo "${initscript}: Killing ${pid}..."
|
||||
kill -KILL ${pid}
|
||||
done
|
||||
}
|
||||
Reference in New Issue
Block a user