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538 lines
14 KiB
538 lines
14 KiB
#!/bin/sh
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##############################################################################
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# Copyright (C) 2016 Eric Luehrsen
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#
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##############################################################################
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#
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# This builds the basic UCI components currently supported for Unbound. It is
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# intentionally NOT comprehensive and bundles a lot of options. The UCI is to
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# be a simpler presentation of the total Unbound conf set.
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#
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##############################################################################
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UNBOUND_B_CONTROL=0
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UNBOUND_B_DNSMASQ=0
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UNBOUND_B_DNSSEC=0
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UNBOUND_B_GATE_NAME=0
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UNBOUND_B_LOCL_BLCK=0
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UNBOUND_B_LOCL_NAME=0
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UNBOUND_B_LOCL_SERV=1
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UNBOUND_B_MAN_CONF=0
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UNBOUND_B_NTP_BOOT=1
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UNBOUND_B_PRIV_BLCK=1
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UNBOUND_B_QUERY_MIN=0
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UNBOUND_D_RESOURCE=small
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UNBOUND_D_RECURSION=passive
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UNBOUND_TXT_FWD_ZONE=""
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UNBOUND_TTL_MIN=120
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UNBOUND_N_EDNS_SIZE=1280
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UNBOUND_N_FWD_PORTS=""
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UNBOUND_N_RX_PORT=53
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UNBOUND_N_ROOT_AGE=28
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##############################################################################
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UNBOUND_ANCHOR=/usr/bin/unbound-anchor
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UNBOUND_CONTROL=/usr/bin/unbound-control
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UNBOUND_LIBDIR=/usr/lib/unbound
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UNBOUND_PIDFILE=/var/run/unbound.pid
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UNBOUND_VARDIR=/var/lib/unbound
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UNBOUND_CONFFILE=$UNBOUND_VARDIR/unbound.conf
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UNBOUND_KEYFILE=$UNBOUND_VARDIR/root.key
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UNBOUND_HINTFILE=$UNBOUND_VARDIR/root.hints
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UNBOUND_TIMEFILE=$UNBOUND_VARDIR/unbound.time
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UNBOUND_CHECKFILE=$UNBOUND_VARDIR/unbound.check
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##############################################################################
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. /lib/functions.sh
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. /lib/functions/network.sh
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. $UNBOUND_LIBDIR/dnsmasq.sh
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. $UNBOUND_LIBDIR/iptools.sh
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. $UNBOUND_LIBDIR/rootzone.sh
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##############################################################################
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create_access_control() {
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local cfg="$1"
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local subnets subnets4 subnets6
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local validip4 validip6
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network_get_subnets subnets4 "$cfg"
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network_get_subnets6 subnets6 "$cfg"
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subnets="$subnets4 $subnets6"
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if [ -n "$subnets" ] ; then
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for subnet in $subnets ; do
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validip4=$( valid_subnet4 $subnet )
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validip6=$( valid_subnet6 $subnet )
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if [ "$validip4" = "ok" -o "$validip6" = "ok" ] ; then
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# For each "network" UCI add "access-control:" white list for queries
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echo " access-control: $subnet allow" >> $UNBOUND_CONFFILE
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fi
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done
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fi
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}
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##############################################################################
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create_domain_insecure() {
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echo " domain-insecure: \"$1\"" >> $UNBOUND_CONFFILE
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}
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##############################################################################
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unbound_mkdir() {
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mkdir -p $UNBOUND_VARDIR
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if [ -f /etc/unbound/root.hints ] ; then
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# Your own local copy of root.hints
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cp -p /etc/unbound/root.hints $UNBOUND_HINTFILE
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elif [ -f /usr/share/dns/root.hints ] ; then
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# Debian-like package dns-root-data
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cp -p /usr/share/dns/root.hints $UNBOUND_HINTFILE
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else
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logger -t unbound -s "iterator will use built-in root hints"
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fi
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if [ -f /etc/unbound/root.key ] ; then
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# Your own local copy of a root.key
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cp -p /etc/unbound/root.key $UNBOUND_KEYFILE
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elif [ -f /usr/share/dns/root.key ] ; then
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# Debian-like package dns-root-data
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cp -p /usr/share/dns/root.key $UNBOUND_KEYFILE
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elif [ -x "$UNBOUND_ANCHOR" ] ; then
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$UNBOUND_ANCHOR -a $UNBOUND_KEYFILE
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else
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logger -t unbound -s "validator will use built-in trust anchor"
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fi
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}
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##############################################################################
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unbound_conf() {
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local cfg=$1
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local rt_mem rt_conn
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{
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# Make fresh conf file
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echo "# $UNBOUND_CONFFILE generated by UCI $( date )"
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echo
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} > $UNBOUND_CONFFILE
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if [ "$UNBOUND_B_CONTROL" -gt 0 ] ; then
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{
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# Enable remote control tool, but only at local host for security
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echo "remote-control:"
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echo " control-enable: yes"
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echo " control-use-cert: no"
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echo " control-interface: 127.0.0.1"
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echo " control-interface: ::1"
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echo
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} >> $UNBOUND_CONFFILE
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else
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{
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# "control:" clause is seperate before "server:" so we can append
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# dnsmasq "server:" parts and "forward:" cluases towards the end.
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echo "remote-control:"
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echo " control-enable: no"
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echo
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} >> $UNBOUND_CONFFILE
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fi
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{
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# No threading
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echo "server:"
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echo " username: unbound"
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echo " num-threads: 1"
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echo " msg-cache-slabs: 1"
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echo " rrset-cache-slabs: 1"
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echo " infra-cache-slabs: 1"
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echo " key-cache-slabs: 1"
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echo
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} >> $UNBOUND_CONFFILE
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{
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# Logging
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echo " verbosity: 1"
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echo " statistics-interval: 0"
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echo " statistics-cumulative: no"
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echo " extended-statistics: no"
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echo
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} >> $UNBOUND_CONFFILE
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{
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# Interfaces (access contol "option local_service")
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echo " interface: 0.0.0.0"
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echo " interface: ::0"
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echo " outgoing-interface: 0.0.0.0"
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echo " outgoing-interface: ::0"
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echo
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} >> $UNBOUND_CONFFILE
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{
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# protocol level tuning
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echo " edns-buffer-size: $UNBOUND_N_EDNS_SIZE"
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echo " msg-buffer-size: 8192"
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echo " port: $UNBOUND_N_RX_PORT"
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echo " outgoing-port-permit: 10240-65535"
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echo
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} >> $UNBOUND_CONFFILE
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{
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# Other harding and options for an embedded router
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echo " harden-short-bufsize: yes"
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echo " harden-large-queries: yes"
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echo " harden-glue: yes"
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echo " harden-below-nxdomain: no"
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echo " harden-referral-path: no"
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echo " use-caps-for-id: no"
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echo
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} >> $UNBOUND_CONFFILE
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{
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# Default Files
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echo " use-syslog: yes"
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echo " chroot: \"$UNBOUND_VARDIR\""
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echo " directory: \"$UNBOUND_VARDIR\""
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echo " pidfile: \"$UNBOUND_PIDFILE\""
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} >> $UNBOUND_CONFFILE
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if [ -f "$UNBOUND_HINTFILE" ] ; then
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# Optional hints if found
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echo " root-hints: \"$UNBOUND_HINTFILE\"" >> $UNBOUND_CONFFILE
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fi
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if [ "$UNBOUND_B_DNSSEC" -gt 0 -a -f "$UNBOUND_KEYFILE" ] ; then
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{
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echo " auto-trust-anchor-file: \"$UNBOUND_KEYFILE\""
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echo
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} >> $UNBOUND_CONFFILE
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else
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echo >> $UNBOUND_CONFFILE
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fi
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case "$UNBOUND_D_RESOURCE" in
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# Tiny - Unbound's recommended cheap hardware config
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tiny) rt_mem=1 ; rt_conn=1 ;;
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# Small - Half RRCACHE and open ports
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small) rt_mem=8 ; rt_conn=5 ;;
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# Medium - Nearly default but with some added balancintg
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medium) rt_mem=16 ; rt_conn=10 ;;
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# Large - Double medium
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large) rt_mem=32 ; rt_conn=10 ;;
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# Whatever unbound does
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*) rt_mem=0 ; rt_conn=0 ;;
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esac
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if [ "$rt_mem" -gt 0 ] ; then
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{
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# Set memory sizing parameters
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echo " outgoing-range: $(($rt_conn*64))"
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echo " num-queries-per-thread: $(($rt_conn*32))"
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echo " outgoing-num-tcp: $(($rt_conn))"
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echo " incoming-num-tcp: $(($rt_conn))"
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echo " rrset-cache-size: $(($rt_mem*256))k"
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echo " msg-cache-size: $(($rt_mem*128))k"
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echo " key-cache-size: $(($rt_mem*128))k"
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echo " neg-cache-size: $(($rt_mem*64))k"
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echo " infra-cache-numhosts: $(($rt_mem*256))"
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echo
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} >> $UNBOUND_CONFFILE
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else
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logger -t unbound -s "default memory resource consumption"
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fi
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if [ "$UNBOUND_B_DNSSEC" -gt 0 ] ; then
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if [ ! -f "$UNBOUND_TIMEFILE" -a "$UNBOUND_B_NTP_BOOT" -gt 0 ] ; then
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# DNSSEC chicken and egg with getting NTP time
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echo " val-override-date: -1" >> $UNBOUND_CONFFILE
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fi
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{
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# Validation of DNSSEC
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echo " module-config: \"validator iterator\""
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echo " harden-dnssec-stripped: yes"
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echo " val-clean-additional: yes"
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echo " ignore-cd-flag: yes"
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echo
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} >> $UNBOUND_CONFFILE
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else
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{
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# Just iteration without DNSSEC
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echo " module-config: \"iterator\""
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echo
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} >> $UNBOUND_CONFFILE
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fi
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if [ "$UNBOUND_B_QUERY_MIN" -gt 0 ] ; then
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# Minor improvement on query privacy
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echo " qname-minimisation: yes" >> $UNBOUND_CONFFILE
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else
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echo " qname-minimisation: no" >> $UNBOUND_CONFFILE
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fi
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case "$UNBOUND_D_RECURSION" in
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passive)
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{
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echo " prefetch: no"
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echo " prefetch-key: no"
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echo " target-fetch-policy: \"0 0 0 0 0\""
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echo
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} >> $UNBOUND_CONFFILE
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;;
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aggressive)
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{
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echo " prefetch: yes"
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echo " prefetch-key: yes"
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echo " target-fetch-policy: \"3 2 1 0 0\""
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echo
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} >> $UNBOUND_CONFFILE
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;;
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*)
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logger -t unbound -s "default recursion configuration"
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;;
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esac
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{
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# Reload records more than 10 hours old
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# DNSSEC 5 minute bogus cool down before retry
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# Adaptive infrastructure info kept for 15 minutes
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echo " cache-min-ttl: $UNBOUND_TTL_MIN"
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echo " cache-max-ttl: 36000"
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echo " val-bogus-ttl: 300"
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echo " infra-host-ttl: 900"
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echo
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} >> $UNBOUND_CONFFILE
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if [ "$UNBOUND_B_PRIV_BLCK" -gt 0 ] ; then
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{
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# Remove DNS reponses from upstream with private IP
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echo " private-address: 10.0.0.0/8"
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echo " private-address: 169.254.0.0/16"
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echo " private-address: 172.16.0.0/12"
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echo " private-address: 192.168.0.0/16"
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echo " private-address: fc00::/8"
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echo " private-address: fd00::/8"
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echo " private-address: fe80::/10"
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} >> $UNBOUND_CONFFILE
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fi
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if [ "$UNBOUND_B_LOCL_BLCK" -gt 0 ] ; then
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{
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# Remove DNS reponses from upstream with loopback IP
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# Black hole DNS method for ad blocking, so consider...
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echo " private-address: 127.0.0.0/8"
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echo " private-address: ::1/128"
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echo
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} >> $UNBOUND_CONFFILE
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else
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echo >> $UNBOUND_CONFFILE
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fi
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# Domain Exceptions
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config_list_foreach "$cfg" "domain_insecure" create_domain_insecure
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echo >> $UNBOUND_CONFFILE
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####################
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# UCI @ network #
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####################
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if [ "$UNBOUND_B_LOCL_SERV" -gt 0 ] ; then
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# Only respond to queries from which this device has an interface.
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# Prevent DNS amplification attacks by not responding to the universe.
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config_load network
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config_foreach create_access_control interface
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{
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echo " access-control: 127.0.0.0/8 allow"
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echo " access-control: ::1/128 allow"
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echo " access-control: fe80::/10 allow"
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echo
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} >> $UNBOUND_CONFFILE
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else
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{
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echo " access-control: 0.0.0.0/0 allow"
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echo " access-control: ::0/0 allow"
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echo
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} >> $UNBOUND_CONFFILE
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fi
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}
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##############################################################################
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unbound_uci() {
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local cfg=$1
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local dnsmasqpath
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####################
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# UCI @ unbound #
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####################
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config_get_bool UNBOUND_B_GATE_NAME "$cfg" dnsmsaq_gate_name 0
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config_get_bool UNBOUND_B_DNSMASQ "$cfg" dnsmasq_link_dns 0
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config_get_bool UNBOUND_B_LOCL_NAME "$cfg" dnsmasq_only_local 0
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config_get_bool UNBOUND_B_LOCL_SERV "$cfg" localservice 1
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config_get_bool UNBOUND_B_MAN_CONF "$cfg" manual_conf 0
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config_get_bool UNBOUND_B_QUERY_MIN "$cfg" query_minimize 0
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config_get_bool UNBOUND_B_PRIV_BLCK "$cfg" rebind_protection 1
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config_get_bool UNBOUND_B_LOCL_BLCK "$cfg" rebind_localhost 0
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config_get_bool UNBOUND_B_CONTROL "$cfg" unbound_control 0
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config_get_bool UNBOUND_B_DNSSEC "$cfg" validator 0
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config_get_bool UNBOUND_B_NTP_BOOT "$cfg" validator_ntp 1
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config_get UNBOUND_N_EDNS_SIZE "$cfg" edns_size 1280
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config_get UNBOUND_N_RX_PORT "$cfg" listen_port 53
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config_get UNBOUND_D_RECURSION "$cfg" recursion passive
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config_get UNBOUND_D_RESOURCE "$cfg" resource small
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config_get UNBOUND_N_ROOT_AGE "$cfg" root_age 7
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config_get UNBOUND_TTL_MIN "$cfg" ttl_min 120
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if [ "$UNBOUND_B_DNSMASQ" -gt 0 ] ; then
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dnsmasqpath=$( which dnsmasq )
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if [ ! -x "$dnsmasqpath" ] ; then
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logger -t unbound -s "cannot forward to dnsmasq"
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UNBOUND_B_DNSMASQ=0
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fi
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fi
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if [ "$UNBOUND_N_EDNS_SIZE" -lt 512 \
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-o 4096 -lt "$UNBOUND_N_EDNS_SIZE" ] ; then
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# exceeds range, back to default
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UNBOUND_N_EDNS_SIZE=1280
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fi
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if [ "$UNBOUND_N_RX_PORT" -lt 1024 \
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-o 10240 -lt "$UNBOUND_N_RX_PORT" ] ; then
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# special port or in 5 digits, back to default
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UNBOUND_N_RX_PORT=53
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fi
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if [ "$UNBOUND_TTL_MIN" -gt 1800 ] ; then
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# that could have had awful side effects
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UNBOUND_TTL_MIN=300
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fi
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if [ "$UNBOUND_B_MAN_CONF" -gt 0 ] ; then
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if [ -f /etc/unbound/unbound.conf ] ; then
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# You don't want UCI and use your own manual configuration
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# or with no base file whatever Unbound defaults are.
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cp -p /etc/unbound/unbound.conf $UNBOUND_CONFFILE
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fi
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# Don't want this being triggered. Maybe we could, but then the
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# base conf you provide would need to be just right.
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UNBOUND_B_DNSMASQ=0
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else
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unbound_conf $cfg
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fi
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}
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##############################################################################
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unbound_own () {
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# Debug UCI
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{
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echo "# $UNBOUND_CHECKFILE generated by UCI $( date )"
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echo
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set | grep ^UNBOUND_
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} > $UNBOUND_CHECKFILE
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if [ ! -f "$UNBOUND_CONFFILE" ] ; then
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# if somehow this happened
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touch $UNBOUND_CONFFILE
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fi
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# Ensure Access
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chown -R unbound:unbound $UNBOUND_VARDIR
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chmod 775 $UNBOUND_VARDIR
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chmod 664 $UNBOUND_VARDIR/*
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}
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##############################################################################
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unbound_prepare() {
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# Make a home for Unbound in /var/lib/unbound
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unbound_mkdir
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# Load up the chunks of UCI
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config_load unbound
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config_foreach unbound_uci unbound
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# Unbound primary DNS, and dnsmasq side service DHCP-DNS (dnsmasq.sh)
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dnsmasq_link
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# Unbound needs chroot ownership
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unbound_own
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}
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##############################################################################
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