From c9e5929ff9db0554f4f4b0a043211ffe82e6f5b2 Mon Sep 17 00:00:00 2001 From: Eric Luehrsen Date: Thu, 27 Oct 2016 22:04:00 -0400 Subject: [PATCH] Unbound: Update scripts to build conf file from UCI -unbound.sh implements the majority of requirements in README.md -rootzone.sh reloads a small subset for alternate trigger maintenance -unbound.init sets procd triggers on Unbound and dnsmasq (dhcp) UCI -two part commit squashed with Makefile included Signed-off-by: Eric Luehrsen --- net/unbound/Makefile | 11 +- net/unbound/files/rootzone.sh | 59 +++-- net/unbound/files/unbound.init | 8 + net/unbound/files/unbound.sh | 468 +++++++++++++++++++++++++++++++-- 4 files changed, 493 insertions(+), 53 deletions(-) diff --git a/net/unbound/Makefile b/net/unbound/Makefile index 62367f758f..eb82db766f 100644 --- a/net/unbound/Makefile +++ b/net/unbound/Makefile @@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk PKG_NAME:=unbound PKG_VERSION:=1.5.10 -PKG_RELEASE:=3 +PKG_RELEASE:=4 PKG_LICENSE:=BSD-3-Clause PKG_LICENSE_FILES:=LICENSE @@ -120,6 +120,7 @@ CONFIGURE_ARGS += \ --with-user=unbound define Package/unbound/conffiles +/etc/config/unbound /etc/unbound/unbound.conf endef @@ -141,13 +142,19 @@ define Package/unbound/install $(PKG_INSTALL_DIR)/etc/unbound/unbound.conf \ $(1)/etc/unbound/unbound.conf $(INSTALL_DATA) ./files/root.key $(1)/etc/unbound/root.key + $(INSTALL_DIR) $(1)/etc/config + $(INSTALL_DATA) ./files/unbound.uci $(1)/etc/config/unbound $(INSTALL_DIR) $(1)/etc/hotplug.d/iface $(INSTALL_BIN) ./files/unbound.iface $(1)/etc/hotplug.d/iface/25-unbound + $(INSTALL_DIR) $(1)/etc/hotplug.d/ntp + $(INSTALL_BIN) ./files/unbound.ntpd $(1)/etc/hotplug.d/ntp/25-unbound $(INSTALL_DIR) $(1)/etc/init.d $(INSTALL_BIN) ./files/unbound.init $(1)/etc/init.d/unbound $(INSTALL_DIR) $(1)/usr/lib/unbound - $(INSTALL_DATA) ./files/unbound.sh $(1)/usr/lib/unbound/unbound.sh + $(INSTALL_DATA) ./files/dnsmasq.sh $(1)/usr/lib/unbound/dnsmasq.sh + $(INSTALL_DATA) ./files/iptools.sh $(1)/usr/lib/unbound/iptools.sh $(INSTALL_DATA) ./files/rootzone.sh $(1)/usr/lib/unbound/rootzone.sh + $(INSTALL_DATA) ./files/unbound.sh $(1)/usr/lib/unbound/unbound.sh endef define Package/unbound-anchor/install diff --git a/net/unbound/files/rootzone.sh b/net/unbound/files/rootzone.sh index fe71f3ef2d..143c0560f6 100644 --- a/net/unbound/files/rootzone.sh +++ b/net/unbound/files/rootzone.sh @@ -7,9 +7,9 @@ # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. -# +# # Copyright (C) 2016 Eric Luehrsen # ############################################################################## @@ -21,15 +21,20 @@ ############################################################################## rootzone_uci() { - # TODO: Just structure to real UCI coming soon. - echo + local cfg=$1 + + # This will likely be called outside of "start_service()" context + config_get_bool UNBOUND_B_DNSSEC "$cfg" validator 0 + config_get_bool UNBOUND_B_NTP_BOOT "$cfg" validator_ntp 1 + config_get UNBOUND_N_ROOT_AGE "$cfg" root_age 30 } ############################################################################## roothints_update() { - # TODO: Maybe this will not be implemented. - echo + # TODO: Might not be implemented. Unbound doesn't natively update hints. + # Unbound philosophy is built in root hints are good for machine life. + return 0 } ############################################################################## @@ -37,34 +42,38 @@ roothints_update() { rootkey_update() { local basekey_date rootkey_date rootkey_age filestuff - # TODO: Just structure to real UCI coming soon. + if [ "$UNBOUND_N_ROOT_AGE" -gt 90 -o "$UNBOUND_B_DNSSEC" -lt 1 ] ; then # Feature disabled return 0 + + elif [ "$UNBOUND_B_NTP_BOOT" -gt 0 -a ! -f "$UNBOUND_TIMEFILE" ] ; then + # We don't have time yet + return 0 fi - - + + if [ -f /etc/unbound/root.key ] ; then basekey_date=$( date -r /etc/unbound/root.key +%s ) - + else # No persistent storage key basekey_date=$( date -d 2000-01-01 +%s ) fi - - + + if [ -f "$UNBOUND_KEYFILE" ] ; then # Unbound maintains it itself rootkey_date=$( date -r $UNBOUND_KEYFILE +%s ) rootkey_age=$(( (rootkey_date - basekey_date) / 86440 )) - + elif [ -x "$UNBOUND_ANCHOR" ] ; then # No tmpfs key - use unbound-anchor rootkey_date=$( date -I +%s ) - rootkey_age=$(( (rootkey_date - basekey_date) / 86440 )) + rootkey_age=$(( (rootkey_date - basekey_date) / 86440 )) $UNBOUND_ANCHOR -a $UNBOUND_KEYFILE - - else + + else # give up rootkey_age=0 fi @@ -72,23 +81,23 @@ rootkey_update() { if [ "$rootkey_age" -gt "$UNBOUND_N_ROOT_AGE" ] ; then filestuff=$( cat $UNBOUND_KEYFILE ) - - + + case "$filestuff" in *NOERROR*) # Header comment for drill and dig logger -t unbound -s "root.key updated after $rootkey_age days" cp -p $UNBOUND_KEYFILE /etc/unbound/root.key ;; - + *"state=2 [ VALID ]"*) # Comment inline to key for unbound-anchor logger -t unbound -s "root.key updated after $rootkey_age days" cp -p $UNBOUND_KEYFILE /etc/unbound/root.key ;; - - *) - logger -t unbound -s "root.key still $rootkey_age days old" + + *) + logger -t unbound -s "root.key still $rootkey_age days old" ;; esac fi @@ -97,7 +106,11 @@ rootkey_update() { ############################################################################## rootzone_update() { - rootzone_uci + # Partial UCI fetch for this functional group + config_load unbound + config_foreach rootzone_uci unbound + + # You need root.hints and root.key to boot strap recursion roothints_update rootkey_update } diff --git a/net/unbound/files/unbound.init b/net/unbound/files/unbound.init index 119289449a..0f5049d0c5 100755 --- a/net/unbound/files/unbound.init +++ b/net/unbound/files/unbound.init @@ -36,3 +36,11 @@ stop_service() { ############################################################################## +service_triggers() { + procd_add_reload_trigger "dhcp" + procd_add_reload_trigger "network" + procd_add_reload_trigger "unbound" +} + +############################################################################## + diff --git a/net/unbound/files/unbound.sh b/net/unbound/files/unbound.sh index 245bd18b26..8312102980 100644 --- a/net/unbound/files/unbound.sh +++ b/net/unbound/files/unbound.sh @@ -7,22 +7,41 @@ # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. -# +# # Copyright (C) 2016 Eric Luehrsen # ############################################################################## # -# TODO: This file will build the UCI for Unbound. This iteration only puts -# our default unbound configuration and root.key into /var/lib/unbound. +# This builds the basic UCI components currently supported for Unbound. It is +# intentionally NOT comprehensive and bundles a lot of options. The UCI is to +# be a simpler presentation of the total Unbound conf set. # ############################################################################## -# TODO: Just default definitions versus real UCI coming soon. -UNBOUND_B_MAN_CONF=1 -UNBOUND_B_DNSSEC=1 -UNBOUND_N_ROOT_AGE=7 +UNBOUND_B_CONTROL=0 +UNBOUND_B_DNSMASQ=0 +UNBOUND_B_DNSSEC=0 +UNBOUND_B_GATE_NAME=0 +UNBOUND_B_LOCL_BLCK=0 +UNBOUND_B_LOCL_NAME=0 +UNBOUND_B_LOCL_SERV=1 +UNBOUND_B_MAN_CONF=0 +UNBOUND_B_NTP_BOOT=1 +UNBOUND_B_PRIV_BLCK=1 +UNBOUND_B_QUERY_MIN=0 + +UNBOUND_D_RESOURCE=small +UNBOUND_D_RECURSION=passive + +UNBOUND_TXT_FWD_ZONE="" +UNBOUND_TTL_MIN=120 + +UNBOUND_N_EDNS_SIZE=1280 +UNBOUND_N_FWD_PORTS="" +UNBOUND_N_RX_PORT=53 +UNBOUND_N_ROOT_AGE=28 ############################################################################## @@ -37,6 +56,7 @@ UNBOUND_VARDIR=/var/lib/unbound UNBOUND_CONFFILE=$UNBOUND_VARDIR/unbound.conf UNBOUND_KEYFILE=$UNBOUND_VARDIR/root.key UNBOUND_HINTFILE=$UNBOUND_VARDIR/root.hints +UNBOUND_TIMEFILE=$UNBOUND_VARDIR/unbound.time UNBOUND_CHECKFILE=$UNBOUND_VARDIR/unbound.check ############################################################################## @@ -44,38 +64,72 @@ UNBOUND_CHECKFILE=$UNBOUND_VARDIR/unbound.check . /lib/functions.sh . /lib/functions/network.sh +. $UNBOUND_LIBDIR/dnsmasq.sh +. $UNBOUND_LIBDIR/iptools.sh . $UNBOUND_LIBDIR/rootzone.sh ############################################################################## +create_access_control() { + local cfg="$1" + local subnets subnets4 subnets6 + local validip4 validip6 + + network_get_subnets subnets4 "$cfg" + network_get_subnets6 subnets6 "$cfg" + subnets="$subnets4 $subnets6" + + + if [ -n "$subnets" ] ; then + for subnet in $subnets ; do + validip4=$( valid_subnet4 $subnet ) + validip6=$( valid_subnet6 $subnet ) + + + if [ "$validip4" = "ok" -o "$validip6" = "ok" ] ; then + # For each "network" UCI add "access-control:" white list for queries + echo " access-control: $subnet allow" >> $UNBOUND_CONFFILE + fi + done + fi +} + +############################################################################## + +create_domain_insecure() { + echo " domain-insecure: \"$1\"" >> $UNBOUND_CONFFILE +} + +############################################################################## + unbound_mkdir() { mkdir -p $UNBOUND_VARDIR - - + + if [ -f /etc/unbound/root.hints ] ; then # Your own local copy of root.hints cp -p /etc/unbound/root.hints $UNBOUND_HINTFILE - + elif [ -f /usr/share/dns/root.hints ] ; then # Debian-like package dns-root-data cp -p /usr/share/dns/root.hints $UNBOUND_HINTFILE - + else logger -t unbound -s "iterator will use built-in root hints" fi - - + + if [ -f /etc/unbound/root.key ] ; then # Your own local copy of a root.key cp -p /etc/unbound/root.key $UNBOUND_KEYFILE - + elif [ -f /usr/share/dns/root.key ] ; then # Debian-like package dns-root-data cp -p /usr/share/dns/root.key $UNBOUND_KEYFILE - - elif [ -x "$UNBOUND_ANCHOR" ] ; then + + elif [ -x "$UNBOUND_ANCHOR" ] ; then $UNBOUND_ANCHOR -a $UNBOUND_KEYFILE - + else logger -t unbound -s "validator will use built-in trust anchor" fi @@ -84,30 +138,379 @@ unbound_mkdir() { ############################################################################## unbound_conf() { - # TODO: Just structure to real UCI coming soon. - if [ "$UNBOUND_B_MAN_CONF" -gt 0 -a -f /etc/unbound/unbound.conf ] ; then - # You don't want UCI and use your own manual configuration - cp -p /etc/unbound/unbound.conf $UNBOUND_CONFFILE + local cfg=$1 + local rt_mem rt_conn + + { + # Make fresh conf file + echo "# $UNBOUND_CONFFILE generated by UCI $( date )" + echo + } > $UNBOUND_CONFFILE + + + if [ "$UNBOUND_B_CONTROL" -gt 0 ] ; then + { + # Enable remote control tool, but only at local host for security + echo "remote-control:" + echo " control-enable: yes" + echo " control-use-cert: no" + echo " control-interface: 127.0.0.1" + echo " control-interface: ::1" + echo + } >> $UNBOUND_CONFFILE + + else + { + # "control:" clause is seperate before "server:" so we can append + # dnsmasq "server:" parts and "forward:" cluases towards the end. + echo "remote-control:" + echo " control-enable: no" + echo + } >> $UNBOUND_CONFFILE + fi + + + { + # No threading + echo "server:" + echo " username: unbound" + echo " num-threads: 1" + echo " msg-cache-slabs: 1" + echo " rrset-cache-slabs: 1" + echo " infra-cache-slabs: 1" + echo " key-cache-slabs: 1" + echo + } >> $UNBOUND_CONFFILE + + + { + # Logging + echo " verbosity: 1" + echo " statistics-interval: 0" + echo " statistics-cumulative: no" + echo " extended-statistics: no" + echo + } >> $UNBOUND_CONFFILE + + + { + # Interfaces (access contol "option local_service") + echo " interface: 0.0.0.0" + echo " interface: ::0" + echo " outgoing-interface: 0.0.0.0" + echo " outgoing-interface: ::0" + echo + } >> $UNBOUND_CONFFILE + + + { + # protocol level tuning + echo " edns-buffer-size: $UNBOUND_N_EDNS_SIZE" + echo " msg-buffer-size: 8192" + echo " port: $UNBOUND_N_RX_PORT" + echo " outgoing-port-permit: 10240-65535" + echo + } >> $UNBOUND_CONFFILE + + + { + # Other harding and options for an embedded router + echo " harden-short-bufsize: yes" + echo " harden-large-queries: yes" + echo " harden-glue: yes" + echo " harden-below-nxdomain: no" + echo " harden-referral-path: no" + echo " use-caps-for-id: no" + echo + } >> $UNBOUND_CONFFILE + + + { + # Default Files + echo " use-syslog: yes" + echo " chroot: \"$UNBOUND_VARDIR\"" + echo " directory: \"$UNBOUND_VARDIR\"" + echo " pidfile: \"$UNBOUND_PIDFILE\"" + } >> $UNBOUND_CONFFILE + + + if [ -f "$UNBOUND_HINTFILE" ] ; then + # Optional hints if found + echo " root-hints: \"$UNBOUND_HINTFILE\"" >> $UNBOUND_CONFFILE + fi + + + if [ "$UNBOUND_B_DNSSEC" -gt 0 -a -f "$UNBOUND_KEYFILE" ] ; then + { + echo " auto-trust-anchor-file: \"$UNBOUND_KEYFILE\"" + echo + } >> $UNBOUND_CONFFILE + + else + echo >> $UNBOUND_CONFFILE + fi + + + case "$UNBOUND_D_RESOURCE" in + # Tiny - Unbound's recommended cheap hardware config + tiny) rt_mem=1 ; rt_conn=1 ;; + # Small - Half RRCACHE and open ports + small) rt_mem=8 ; rt_conn=5 ;; + # Medium - Nearly default but with some added balancintg + medium) rt_mem=16 ; rt_conn=10 ;; + # Large - Double medium + large) rt_mem=32 ; rt_conn=10 ;; + # Whatever unbound does + *) rt_mem=0 ; rt_conn=0 ;; + esac + + + if [ "$rt_mem" -gt 0 ] ; then + { + # Set memory sizing parameters + echo " outgoing-range: $(($rt_conn*64))" + echo " num-queries-per-thread: $(($rt_conn*32))" + echo " outgoing-num-tcp: $(($rt_conn))" + echo " incoming-num-tcp: $(($rt_conn))" + echo " rrset-cache-size: $(($rt_mem*256))k" + echo " msg-cache-size: $(($rt_mem*128))k" + echo " key-cache-size: $(($rt_mem*128))k" + echo " neg-cache-size: $(($rt_mem*64))k" + echo " infra-cache-numhosts: $(($rt_mem*256))" + echo + } >> $UNBOUND_CONFFILE + + else + logger -t unbound -s "default memory resource consumption" + fi + + + if [ "$UNBOUND_B_DNSSEC" -gt 0 ] ; then + if [ ! -f "$UNBOUND_TIMEFILE" -a "$UNBOUND_B_NTP_BOOT" -gt 0 ] ; then + # DNSSEC chicken and egg with getting NTP time + echo " val-override-date: -1" >> $UNBOUND_CONFFILE + fi + + + { + # Validation of DNSSEC + echo " module-config: \"validator iterator\"" + echo " harden-dnssec-stripped: yes" + echo " val-clean-additional: yes" + echo " ignore-cd-flag: yes" + echo + } >> $UNBOUND_CONFFILE + + else + { + # Just iteration without DNSSEC + echo " module-config: \"iterator\"" + echo + } >> $UNBOUND_CONFFILE + fi + + + if [ "$UNBOUND_B_QUERY_MIN" -gt 0 ] ; then + # Minor improvement on query privacy + echo " qname-minimisation: yes" >> $UNBOUND_CONFFILE + + else + echo " qname-minimisation: no" >> $UNBOUND_CONFFILE + fi + + + case "$UNBOUND_D_RECURSION" in + passive) + { + echo " prefetch: no" + echo " prefetch-key: no" + echo " target-fetch-policy: \"0 0 0 0 0\"" + echo + } >> $UNBOUND_CONFFILE + ;; + + aggressive) + { + echo " prefetch: yes" + echo " prefetch-key: yes" + echo " target-fetch-policy: \"3 2 1 0 0\"" + echo + } >> $UNBOUND_CONFFILE + ;; + + *) + logger -t unbound -s "default recursion configuration" + ;; + esac + + + { + # Reload records more than 10 hours old + # DNSSEC 5 minute bogus cool down before retry + # Adaptive infrastructure info kept for 15 minutes + echo " cache-min-ttl: $UNBOUND_TTL_MIN" + echo " cache-max-ttl: 36000" + echo " val-bogus-ttl: 300" + echo " infra-host-ttl: 900" + echo + } >> $UNBOUND_CONFFILE + + + if [ "$UNBOUND_B_PRIV_BLCK" -gt 0 ] ; then + { + # Remove DNS reponses from upstream with private IP + echo " private-address: 10.0.0.0/8" + echo " private-address: 169.254.0.0/16" + echo " private-address: 172.16.0.0/12" + echo " private-address: 192.168.0.0/16" + echo " private-address: fc00::/8" + echo " private-address: fd00::/8" + echo " private-address: fe80::/10" + } >> $UNBOUND_CONFFILE + fi + + + if [ "$UNBOUND_B_LOCL_BLCK" -gt 0 ] ; then + { + # Remove DNS reponses from upstream with loopback IP + # Black hole DNS method for ad blocking, so consider... + echo " private-address: 127.0.0.0/8" + echo " private-address: ::1/128" + echo + } >> $UNBOUND_CONFFILE + + else + echo >> $UNBOUND_CONFFILE + fi + + + # Domain Exceptions + config_list_foreach "$cfg" "domain_insecure" create_domain_insecure + echo >> $UNBOUND_CONFFILE + + + #################### + # UCI @ network # + #################### + + + if [ "$UNBOUND_B_LOCL_SERV" -gt 0 ] ; then + # Only respond to queries from which this device has an interface. + # Prevent DNS amplification attacks by not responding to the universe. + config_load network + config_foreach create_access_control interface + + { + echo " access-control: 127.0.0.0/8 allow" + echo " access-control: ::1/128 allow" + echo " access-control: fe80::/10 allow" + echo + } >> $UNBOUND_CONFFILE + + else + { + echo " access-control: 0.0.0.0/0 allow" + echo " access-control: ::0/0 allow" + echo + } >> $UNBOUND_CONFFILE + fi +} + +############################################################################## + +unbound_uci() { + local cfg=$1 + local dnsmasqpath + + #################### + # UCI @ unbound # + #################### + + config_get_bool UNBOUND_B_GATE_NAME "$cfg" dnsmsaq_gate_name 0 + config_get_bool UNBOUND_B_DNSMASQ "$cfg" dnsmasq_link_dns 0 + config_get_bool UNBOUND_B_LOCL_NAME "$cfg" dnsmasq_only_local 0 + config_get_bool UNBOUND_B_LOCL_SERV "$cfg" localservice 1 + config_get_bool UNBOUND_B_MAN_CONF "$cfg" manual_conf 0 + config_get_bool UNBOUND_B_QUERY_MIN "$cfg" query_minimize 0 + config_get_bool UNBOUND_B_PRIV_BLCK "$cfg" rebind_protection 1 + config_get_bool UNBOUND_B_LOCL_BLCK "$cfg" rebind_localhost 0 + config_get_bool UNBOUND_B_CONTROL "$cfg" unbound_control 0 + config_get_bool UNBOUND_B_DNSSEC "$cfg" validator 0 + config_get_bool UNBOUND_B_NTP_BOOT "$cfg" validator_ntp 1 + + config_get UNBOUND_N_EDNS_SIZE "$cfg" edns_size 1280 + config_get UNBOUND_N_RX_PORT "$cfg" listen_port 53 + config_get UNBOUND_D_RECURSION "$cfg" recursion passive + config_get UNBOUND_D_RESOURCE "$cfg" resource small + config_get UNBOUND_N_ROOT_AGE "$cfg" root_age 7 + config_get UNBOUND_TTL_MIN "$cfg" ttl_min 120 + + + if [ "$UNBOUND_B_DNSMASQ" -gt 0 ] ; then + dnsmasqpath=$( which dnsmasq ) + + + if [ ! -x "$dnsmasqpath" ] ; then + logger -t unbound -s "cannot forward to dnsmasq" + UNBOUND_B_DNSMASQ=0 + fi + fi + + + if [ "$UNBOUND_N_EDNS_SIZE" -lt 512 \ + -o 4096 -lt "$UNBOUND_N_EDNS_SIZE" ] ; then + # exceeds range, back to default + UNBOUND_N_EDNS_SIZE=1280 + fi + + + if [ "$UNBOUND_N_RX_PORT" -lt 1024 \ + -o 10240 -lt "$UNBOUND_N_RX_PORT" ] ; then + # special port or in 5 digits, back to default + UNBOUND_N_RX_PORT=53 + fi + + + if [ "$UNBOUND_TTL_MIN" -gt 1800 ] ; then + # that could have had awful side effects + UNBOUND_TTL_MIN=300 + fi + + + if [ "$UNBOUND_B_MAN_CONF" -gt 0 ] ; then + if [ -f /etc/unbound/unbound.conf ] ; then + # You don't want UCI and use your own manual configuration + # or with no base file whatever Unbound defaults are. + cp -p /etc/unbound/unbound.conf $UNBOUND_CONFFILE + fi + + + # Don't want this being triggered. Maybe we could, but then the + # base conf you provide would need to be just right. + UNBOUND_B_DNSMASQ=0 + + else + unbound_conf $cfg fi } ############################################################################## -unbound_own() { +unbound_own () { # Debug UCI { echo "# $UNBOUND_CHECKFILE generated by UCI $( date )" echo set | grep ^UNBOUND_ } > $UNBOUND_CHECKFILE - - + + if [ ! -f "$UNBOUND_CONFFILE" ] ; then # if somehow this happened touch $UNBOUND_CONFFILE fi - - + + # Ensure Access chown -R unbound:unbound $UNBOUND_VARDIR chmod 775 $UNBOUND_VARDIR @@ -117,8 +520,17 @@ unbound_own() { ############################################################################## unbound_prepare() { + # Make a home for Unbound in /var/lib/unbound unbound_mkdir - unbound_conf + + # Load up the chunks of UCI + config_load unbound + config_foreach unbound_uci unbound + + # Unbound primary DNS, and dnsmasq side service DHCP-DNS (dnsmasq.sh) + dnsmasq_link + + # Unbound needs chroot ownership unbound_own } -- 2.30.2