# Copyright (C) 2006-2010 OpenWrt.org
# Copyright (C) 2006 Carlos Sobrinho
-START=50
+START=19
STOP=50
USE_PROCD=1
-
-NAME=dropbear
PROG=/usr/sbin/dropbear
+NAME=dropbear
PIDCOUNT=0
-EXTRA_COMMANDS="killclients"
-EXTRA_HELP=" killclients Kill ${NAME} processes except servers and yourself"
-dropbear_instance()
+extra_command "killclients" "Kill ${NAME} processes except servers and yourself"
+
+_dropbearkey()
{
- append_ports()
- {
- local ifname="$1"
- local port="$2"
-
- grep -qs "^ *$ifname:" /proc/net/dev || {
- procd_append_param command -p "$port"
- return
- }
+ /usr/bin/dropbearkey "$@" 0<&- 1>&- 2>&-
+}
- for addr in $(
- ifconfig "$ifname" | sed -ne '
- /addr: *fe[89ab][0-9a-f]:/d
- s/.* addr: *\([0-9a-f:\.]*\).*/\1/p
- '
- ); do
- procd_append_param command -p "$addr:$port"
- done
+# $1 - host key file name
+hk_verify()
+{
+ [ -f "$1" ] || return 1
+ [ -s "$1" ] || return 2
+ _dropbearkey -y -f "$1" || return 3
+ return 0
+}
+
+# $1 - hk_verify() return code
+hk_errmsg()
+{
+ case "$1" in
+ 0) ;;
+ 1) echo "file does not exist" ;;
+ 2) echo "file has zero length" ;;
+ 3) echo "file is not valid host key or not supported" ;;
+ *) echo "unknown error" ;;
+ esac
+}
+
+# $1 - config option
+# $2 - host key file name
+hk_config()
+{
+ local x m
+ hk_verify "$2"; x=$?
+ case "$x" in
+ 0) procd_append_param command -r "$2"
+ ;;
+ *) m=$(hk_errmsg "$x")
+ logger -t "${NAME}" -p daemon.warn \
+ "option '$1', value '$2': $m, skipping"
+ ;;
+ esac
+}
+
+# $1 - host key file name
+hk_config__keyfile()
+{
+ hk_config 'keyfile' "$1"
+}
+
+hk_generate_as_needed()
+{
+ local kdir kgen ktype tdir kcount tfile
+ kdir='/etc/dropbear'
+
+ kgen=''
+ for ktype in ed25519 ecdsa rsa; do
+ hk_verify "${kdir}/dropbear_${ktype}_host_key" && continue
+
+ kgen="${kgen} ${ktype}"
+ done
+
+ [ -z "${kgen}" ] && return
+
+ tdir=$(mktemp -d); chmod 0700 "${tdir}"
+
+ kcount=0
+ for ktype in ${kgen}; do
+ tfile="${tdir}/dropbear_${ktype}_host_key"
+
+ if ! _dropbearkey -t ${ktype} -f "${tfile}"; then
+ # unsupported key type
+ rm -f "${tfile}"
+ continue
+ fi
+
+ kcount=$((kcount+1))
+ done
+
+ if [ ${kcount} -ne 0 ]; then
+ mkdir -p "${kdir}"; chmod 0700 "${kdir}"; chown root "${kdir}"
+ mv -f "${tdir}/"* "${kdir}/"
+ fi
+
+ rm -rf "${tdir}"
+}
+
+append_ports()
+{
+ local ipaddrs="$1"
+ local port="$2"
+
+ [ -z "$ipaddrs" ] && {
+ procd_append_param command -p "$port"
+ return
}
+ for addr in $ipaddrs; do
+ procd_append_param command -p "$addr:$port"
+ done
+}
- local section="$1"
+validate_section_dropbear()
+{
+ uci_load_validate dropbear dropbear "$1" "$2" \
+ 'PasswordAuth:bool:1' \
+ 'enable:bool:1' \
+ 'Interface:string' \
+ 'GatewayPorts:bool:0' \
+ 'ForceCommand:string' \
+ 'RootPasswordAuth:bool:1' \
+ 'RootLogin:bool:1' \
+ 'rsakeyfile:file' \
+ 'keyfile:list(file)' \
+ 'BannerFile:file' \
+ 'Port:port:22' \
+ 'SSHKeepAlive:uinteger:300' \
+ 'IdleTimeout:uinteger:0' \
+ 'MaxAuthTries:uinteger:3' \
+ 'RecvWindowSize:uinteger:0' \
+ 'mdns:bool:1'
+}
- # check if section is enabled (default)
- local enabled
- config_get_bool enabled "${section}" enable 1
- [ "${enabled}" -eq 0 ] && return 1
+dropbear_instance()
+{
+ local ipaddrs
- # increase pid file count to handle multiple instances correctly
- PIDCOUNT="$(( ${PIDCOUNT} + 1))"
+ [ "$2" = 0 ] || {
+ echo "validation failed"
+ return 1
+ }
+
+ [ -n "${Interface}" ] && {
+ [ -n "${BOOT}" ] && return 0
+
+ network_get_ipaddrs_all ipaddrs "${Interface}" || {
+ echo "interface ${Interface} has no physdev or physdev has no suitable ip"
+ return 1
+ }
+ }
+ [ "${enable}" = "0" ] && return 1
+ PIDCOUNT="$(( ${PIDCOUNT} + 1))"
local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
+ # Increase default receive window size to increase
+ # throughput on high latency links
+ if [ "${RecvWindowSize}" -eq "0" ]; then
+ RecvWindowSize="262144"
+ fi
+
procd_open_instance
procd_set_param command "$PROG" -F -P "$pid_file"
-
- # prepare parameters (initialise with pid file)
- local val
-
- # A) password authentication
- config_get_bool val "${section}" PasswordAuth 1
- [ "${val}" -eq 0 ] && procd_append_param command -s
-
- # B) listen interface and port
- local port
- local interface
- config_get interface "${section}" Interface
- [ -n "$interface" ] && network_get_device interface "$interface"
- config_get port "${section}" Port 22
- append_ports "$interface" "$port"
- # C) banner file
- config_get val "${section}" BannerFile
- [ -f "${val}" ] && procd_append_param command -b "${val}"
- # D) gatewayports
- config_get_bool val "${section}" GatewayPorts 0
- [ "${val}" -eq 1 ] && procd_append_param command -a
- # E) root password authentication
- config_get_bool val "${section}" RootPasswordAuth 1
- [ "${val}" -eq 0 ] && procd_append_param command -g
- # F) root login
- config_get_bool val "${section}" RootLogin 1
- [ "${val}" -eq 0 ] && procd_append_param command -w
- # G) host keys
- config_get val "${section}" rsakeyfile
- [ -f "${val}" ] && procd_append_param command -r "${val}"
- config_get val "${section}" dsskeyfile
- [ -f "${val}" ] && procd_append_param command -d "${val}"
-
+ [ "${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 "${BannerFile}"
+ append_ports "${ipaddrs}" "${Port}"
+ [ "${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 -a "${RecvWindowSize}" -le 1048576 ] && \
+ procd_append_param command -W "${RecvWindowSize}"
+ [ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
+ procd_set_param respawn
procd_close_instance
}
-keygen()
+load_interfaces()
{
- for keytype in rsa dss; do
- # check for keys
- key=dropbear/dropbear_${keytype}_host_key
- [ -f /tmp/$key -o -s /etc/$key ] || {
- # generate missing keys
- mkdir -p /tmp/dropbear
- [ -x /usr/bin/dropbearkey ] && {
- /usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
- } &
- exit 0
- }
- done
+ config_get interface "$1" Interface
+ config_get enable "$1" enable 1
- lock /tmp/.switch2jffs
- mkdir -p /etc/dropbear
- mv /tmp/dropbear/dropbear_* /etc/dropbear/
- lock -u /tmp/.switch2jffs
- chown root /etc/dropbear
- chmod 0700 /etc/dropbear
+ [ "${enable}" = "1" ] && interfaces=" ${interface} ${interfaces}"
+}
+
+boot()
+{
+ BOOT=1
+ start "$@"
}
start_service()
{
- [ -s /etc/dropbear/dropbear_rsa_host_key -a \
- -s /etc/dropbear/dropbear_dss_host_key ] || keygen
+ hk_generate_as_needed
. /lib/functions.sh
. /lib/functions/network.sh
config_load "${NAME}"
- config_foreach dropbear_instance dropbear
+ config_foreach validate_section_dropbear dropbear dropbear_instance
}
service_triggers()
{
- procd_add_reload_trigger "dropbear"
+ local interfaces
+
+ procd_add_config_trigger "config.change" "dropbear" /etc/init.d/dropbear reload
+
+ config_load "${NAME}"
+ config_foreach load_interfaces dropbear
+
+ [ -n "${interfaces}" ] && {
+ for n in $interfaces ; do
+ procd_add_interface_trigger "interface.*" $n /etc/init.d/dropbear reload
+ done
+ }
+
+ procd_add_validation validate_section_dropbear
+}
+
+shutdown() {
+ # close all open connections
+ killall dropbear
}
killclients()
while [ "${pid}" -ne 0 ]
do
# get parent process id
- pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
+ pid=$(cut -d ' ' -f 4 "/proc/${pid}/stat")
[ "${pid}" -eq 0 ] && break
# check if client connection
done
# get all server pids that should be ignored
- for server in `cat /var/run/${NAME}.*.pid`
+ 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}"`
+ for pid in $(pidof "${NAME}")
do
# check if correct program, otherwise process next pid
grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
skip=0
for server in ${ignore}
do
- if [ "${pid}" == "${server}" ]
+ if [ "${pid}" = "${server}" ]
then
skip=1
break
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