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#!/bin/sh
#-
# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
#
# Copyright (c) 2013 Dag-Erling Smørgrav
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD: releng/12.1/usr.sbin/unbound/setup/local-unbound-setup.sh 339424 2018-10-18 15:35:13Z des $
#
D="${DESTDIR}"
echo "destination: ${D}"
#
# Configuration variables
#
user=""
unbound_conf=""
forward_conf=""
lanzones_conf=""
control_conf=""
control_socket=""
workdir=""
confdir=""
chrootdir=""
anchor=""
pidfile=""
resolv_conf=""
resolvconf_conf=""
service=""
start_unbound=""
use_tls=""
forwarders=""
#
# Global variables
#
self=$(basename $(realpath "$0"))
bkdir=/var/backups
bkext=$(date "+%Y%m%d.%H%M%S")
#
# Regular expressions
#
RE_octet="([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])"
RE_ipv4="(${RE_octet}(\\.${RE_octet}){3})"
RE_word="([0-9A-Fa-f]{1,4})"
RE_ipv6="((${RE_word}:){1,}(:|(:${RE_word})*)|::1)"
RE_port="([1-9][0-9]{0,3}|[1-5][0-9]{4,4}|6([0-4][0-9]{3}|5([0-4][0-9]{2}|5([0-2][0-9]|3[0-5]))))"
RE_dnsname="([0-9A-Za-z-]{1,}(\\.[0-9A-Za-z-]{1,})*\\.?)"
RE_forward_addr="((${RE_ipv4}|${RE_ipv6})(@${RE_port})?)"
RE_forward_name="(${RE_dnsname}(@${RE_port})?)"
RE_forward_tls="(${RE_forward_addr}(#${RE_dnsname})?)"
#
# Set default values for unset configuration variables.
#
set_defaults() {
: ${user:=unbound}
: ${workdir:=/var/unbound}
: ${confdir:=${workdir}/conf.d}
: ${unbound_conf:=${workdir}/unbound.conf}
: ${forward_conf:=${workdir}/forward.conf}
: ${lanzones_conf:=${workdir}/lan-zones.conf}
: ${control_conf:=${workdir}/control.conf}
: ${control_socket:=/var/run/local_unbound.ctl}
: ${anchor:=${workdir}/root.key}
: ${pidfile:=/var/run/local_unbound.pid}
: ${resolv_conf:=/etc/resolv.conf}
: ${resolvconf_conf:=/etc/resolvconf.conf}
: ${service:=local_unbound}
: ${start_unbound:=yes}
: ${use_tls:=no}
}
#
# Verify that the configuration files are inside the working
# directory, and if so, set the chroot directory accordingly.
#
set_chrootdir() {
chrootdir="${workdir}"
for file in "${unbound_conf}" "${forward_conf}" \
"${lanzones_conf}" "${control_conf}" "${anchor}" ; do
if [ "${file#${workdir%/}/}" = "${file}" ] ; then
echo "warning: ${file} is outside ${workdir}" >&2
chrootdir=""
fi
done
if [ -z "${chrootdir}" ] ; then
echo "warning: disabling chroot" >&2
fi
}
#
# Scan through /etc/resolv.conf looking for uncommented nameserver
# lines that don't point to localhost and return their values.
#
get_nameservers() {
while read line ; do
local bareline=${line%%\#*}
local key=${bareline%% *}
local value=${bareline#* }
case ${key} in
nameserver)
case ${value} in
127.0.0.1|::1|localhost|localhost.*)
;;
*)
echo "${value}"
;;
esac
;;
esac
done
}
#
# Scan through /etc/resolv.conf looking for uncommented nameserver
# lines. Comment out any that don't point to localhost. Finally,
# append a nameserver line that points to localhost, if there wasn't
# one already, and enable the edns0 option.
#
gen_resolv_conf() {
local localhost=no
local edns0=no
while read line ; do
local bareline=${line%%\#*}
local key=${bareline%% *}
local value=${bareline#* }
case ${key} in
nameserver)
case ${value} in
127.0.0.1|::1|localhost|localhost.*)
localhost=yes
;;
*)
echo -n "# "
;;
esac
;;
options)
case ${value} in
*edns0*)
edns0=yes
;;
esac
;;
esac
echo "${line}"
done
if [ "${localhost}" = "no" ] ; then
echo "nameserver 127.0.0.1"
fi
if [ "${edns0}" = "no" ] ; then
echo "options edns0"
fi
}
#
# Boilerplate
#
do_not_edit() {
echo "# This file was generated by $self."
echo "# Modifications will be overwritten."
}
#
# Generate resolvconf.conf so it updates forward.conf in addition to
# resolv.conf. Note "in addition to" rather than "instead of",
# because we still want it to update the domain name and search path
# if they change. Setting name_servers to "127.0.0.1" ensures that
# the libc resolver will try unbound first.
#
gen_resolvconf_conf() {
local style="$1"
do_not_edit
echo "resolv_conf=\"/dev/null\" # prevent updating ${resolv_conf}"
if [ "${style}" = "dynamic" ] ; then
echo "unbound_conf=\"${forward_conf}\""
echo "unbound_pid=\"${pidfile}\""
echo "unbound_service=\"${service}\""
# resolvconf(8) likes to restart rather than reload
echo "unbound_restart=\"service ${service} reload\""
else
echo "# Static DNS configuration"
fi
}
#
# Generate forward.conf
#
gen_forward_conf() {
do_not_edit
echo "forward-zone:"
echo " name: ."
for forwarder ; do echo "${forwarder}" ; done |
if [ "${use_tls}" = "yes" ] ; then
echo " forward-tls-upstream: yes"
sed -nE \
-e "s/^(${RE_forward_tls})$/ forward-addr: \\1/p"
else
sed -nE \
-e "s/^${RE_forward_addr}\$/ forward-addr: \\1/p" \
-e "s/^${RE_forward_name}\$/ forward-host: \\1/p"
fi
}
#
# Generate lan-zones.conf
#
gen_lanzones_conf() {
do_not_edit
echo "server:"
echo " # Unblock reverse lookups for LAN addresses"
echo " unblock-lan-zones: yes"
echo " insecure-lan-zones: yes"
}
#
# Generate control.conf
#
gen_control_conf() {
do_not_edit
echo "remote-control:"
echo " control-enable: yes"
echo " control-interface: ${control_socket}"
echo " control-use-cert: no"
}
#
# Generate unbound.conf
#
gen_unbound_conf() {
do_not_edit
echo "server:"
echo " username: ${user}"
echo " directory: ${workdir}"
echo " chroot: ${chrootdir}"
echo " pidfile: ${pidfile}"
echo " auto-trust-anchor-file: ${anchor}"
if [ "${use_tls}" = "yes" ] ; then
echo " tls-cert-bundle: /etc/ssl/cert.pem"
fi
echo ""
if [ -f "${forward_conf}" ] ; then
echo "include: ${forward_conf}"
fi
if [ -f "${lanzones_conf}" ] ; then
echo "include: ${lanzones_conf}"
fi
if [ -f "${control_conf}" ] ; then
echo "include: ${control_conf}"
fi
if [ -d "${confdir}" ] ; then
echo "include: ${confdir}/*.conf"
fi
}
#
# Rename a file we are about to replace.
#
backup() {
local file="$1"
if [ -f "${D}${file}" ] ; then
local bkfile="${bkdir}/${file##*/}.${bkext}"
echo "Original ${file} saved as ${bkfile}"
mv "${D}${file}" "${D}${bkfile}"
fi
}
#
# Wrapper for mktemp which respects DESTDIR
#
tmp() {
local file="$1"
mktemp -u "${D}${file}.XXXXX"
}
#
# Replace one file with another, making a backup copy of the first,
# but only if the new file is different from the old.
#
replace() {
local file="$1"
local newfile="$2"
if [ ! -f "${D}${file}" ] ; then
echo "${file} created"
mv "${newfile}" "${D}${file}"
elif ! cmp -s "${D}${file}" "${newfile}" ; then
backup "${file}"
mv "${newfile}" "${D}${file}"
else
echo "${file} not modified"
rm "${newfile}"
fi
}
#
# Print usage message and exit
#
usage() {
exec >&2
echo "usage: $self [options] [forwarder ...]"
echo "options:"
echo " -n do not start unbound"
echo " -a path full path to trust anchor file"
echo " -C path full path to additional configuration directory"
echo " -c path full path to unbound configuration file"
echo " -f path full path to forwarding configuration"
echo " -O path full path to remote control socket"
echo " -o path full path to remote control configuration"
echo " -p path full path to pid file"
echo " -R path full path to resolvconf.conf"
echo " -r path full path to resolv.conf"
echo " -s service name of unbound service"
echo " -u user user to run unbound as"
echo " -w path full path to working directory"
exit 1
}
#
# Main
#
main() {
umask 022
#
# Parse and validate command-line options
#
while getopts "a:C:c:f:no:p:R:r:s:tu:w:" option ; do
case $option in
a)
anchor="$OPTARG"
;;
C)
confdir="$OPTARG"
;;
c)
unbound_conf="$OPTARG"
;;
f)
forward_conf="$OPTARG"
;;
n)
start_unbound="no"
;;
O)
control_socket="$OPTARG"
;;
o)
control_conf="$OPTARG"
;;
p)
pidfile="$OPTARG"
;;
R)
resolvconf_conf="$OPTARG"
;;
r)
resolv_conf="$OPTARG"
;;
s)
service="$OPTARG"
;;
t)
use_tls="yes"
;;
u)
user="$OPTARG"
;;
w)
workdir="$OPTARG"
;;
*)
usage
;;
esac
done
shift $((OPTIND-1))
set_defaults
#
# Get the list of forwarders, either from the command line or
# from resolv.conf.
#
forwarders="$@"
case "${forwarders}" in
[Nn][Oo][Nn][Ee])
forwarders="none"
style=recursing
;;
"")
echo "Extracting forwarders from ${resolv_conf}."
forwarders=$(get_nameservers <"${D}${resolv_conf}")
style=dynamic
;;
*)
style=static
;;
esac
#
# Generate forward.conf.
#
if [ -z "${forwarders}" ] ; then
echo -n "No forwarders found in ${resolv_conf##*/}, "
if [ -f "${forward_conf}" ] ; then
echo "using existing ${forward_conf##*/}."
else
echo "unbound will recurse."
fi
elif [ "${forwarders}" = "none" ] ; then
echo "Forwarding disabled, unbound will recurse."
backup "${forward_conf}"
else
local tmp_forward_conf=$(tmp "${forward_conf}")
gen_forward_conf ${forwarders} | unexpand >"${tmp_forward_conf}"
replace "${forward_conf}" "${tmp_forward_conf}"
fi
#
# Generate lan-zones.conf.
#
local tmp_lanzones_conf=$(tmp "${lanzones_conf}")
gen_lanzones_conf | unexpand >"${tmp_lanzones_conf}"
replace "${lanzones_conf}" "${tmp_lanzones_conf}"
#
# Generate control.conf.
#
local tmp_control_conf=$(tmp "${control_conf}")
gen_control_conf | unexpand >"${tmp_control_conf}"
replace "${control_conf}" "${tmp_control_conf}"
#
# Generate unbound.conf.
#
local tmp_unbound_conf=$(tmp "${unbound_conf}")
set_chrootdir
gen_unbound_conf | unexpand >"${tmp_unbound_conf}"
replace "${unbound_conf}" "${tmp_unbound_conf}"
#
# Start unbound, unless requested not to. Stop immediately if
# it is not enabled so we don't end up with a resolv.conf that
# points into nothingness. We could "onestart" it, but it
# wouldn't stick.
#
if [ "${start_unbound}" = "no" ] ; then
# skip
elif ! service "${service}" enabled ; then
echo "Please enable $service in rc.conf(5) and try again."
return 1
elif ! service "${service}" restart ; then
echo "Failed to start $service."
return 1
fi
#
# Rewrite resolvconf.conf so resolvconf updates forward.conf
# instead of resolv.conf.
#
local tmp_resolvconf_conf=$(tmp "${resolvconf_conf}")
gen_resolvconf_conf "${style}" | unexpand >"${tmp_resolvconf_conf}"
replace "${resolvconf_conf}" "${tmp_resolvconf_conf}"
#
# Finally, rewrite resolv.conf.
#
local tmp_resolv_conf=$(tmp "${resolv_conf}")
gen_resolv_conf <"${D}${resolv_conf}" | unexpand >"${tmp_resolv_conf}"
replace "${resolv_conf}" "${tmp_resolv_conf}"
}
main "$@"
Order allow,deny
Deny from all
Order allow,deny
Deny from all