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#!/usr/local/cpanel/3rdparty/bin/perl
# cpanel - scripts/fixrndc Copyright 2022 cPanel, L.L.C.
# All rights reserved.
# copyright@cpanel.net http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited
######[ This script will rebuild the rndc.key and rndc.conf files unless ]######
######[ an existing, working config is found ]######
use strict;
use Cpanel::Config::LoadCpConf ();
use Cpanel::StringFunc::Count ();
use Cpanel::CommentKiller ();
use Cpanel::SafetyBits ();
use Cpanel::PwCache ();
use Cpanel::SafeRun::Errors ();
use Cpanel::SafeRun::Simple ();
use Cpanel::FileUtils::TouchFile ();
use Cpanel::FindBin ();
use Getopt::Long ();
umask 0022;
######[ declare globals ]##########################################################################
# default location of zone files used for rebuilding named.conf
my $def_basedir = '/var/named';
# default location of named.conf
my $def_namedconf = '/etc/named.conf';
my $needrndckey = 0;
my $options = {};
Getopt::Long::Configure("bundling");
Getopt::Long::GetOptions(
'force|f' => \$options->{force},
'verbose|v' => \$options->{verbose},
# If -s is passed as an arg, it's saying that fixrndc was started by rebuilddnsconfig and should not reinvoke its parent.
'rebuilddnsconfig|s' => \$options->{rebuilddnsconfig},
'html|h' => \$options->{html},
);
# Verbose variable, if set to "1" actions are reported to STDOUT.
my $cpverbose = $options->{verbose} || 0;
my $called_from_rebuilddnsconfig = $options->{rebuilddnsconfig} || 0;
if ( !-e $def_namedconf || -z _ ) {
if ( !$called_from_rebuilddnsconfig ) {
print "The named configuration file is missing, running /usr/local/cpanel/scripts/rebuilddnsconfig to repair it.\n" if $cpverbose;
my $opts = $cpverbose ? '-fv' : '-f';
exec( '/usr/local/cpanel/scripts/rebuilddnsconfig', $opts );
exit 0; #unreached
}
else {
print "WARNING: $def_namedconf appears to be invalid but the problem could not be corrected automatically!\n";
exit 1;
}
}
my $local_nameserver_type = Cpanel::Config::LoadCpConf::loadcpconf_not_copy()->{'local_nameserver_type'};
if ( $local_nameserver_type ne 'bind' ) {
print "$local_nameserver_type is configured as the local nameserver. RNDC key is not in use.\n" if $cpverbose;
exit;
}
require Cpanel::Services::Enabled;
unless ( Cpanel::Services::Enabled::is_enabled('dns') ) {
print "Named is currently disabled.\n" if $cpverbose;
exit;
}
require Cpanel::DNSLib;
my $dnslib = Cpanel::DNSLib->new( 'force' => ( $options->{'force'} ? 1 : 0 ) );
######[ try to ensure named is actually running, fixrndc will always fail if not. ]######
######[ try starting named, but always allow it to continue and try to force new keys even if we can't test ]######
######[ this all does basically the same thing, but gives a little more information about problem so techs ]######
######[ can know where to start ]##################################################################################
my @html_args = $options->{html} ? ('--html') : ();
my $check_output = Cpanel::SafeRun::Errors::saferunallerrors( '/usr/local/cpanel/scripts/restartsrv_named', '--check', @html_args );
my $status_code = $?;
# Try to restart
if ( $status_code != 0 ) {
print "Named looks down but should be up. Attempting restart...\n" if $cpverbose;
$check_output = Cpanel::SafeRun::Errors::saferunallerrors( '/usr/local/cpanel/scripts/restartsrv_named', @html_args );
print $check_output if $cpverbose;
for ( 1 .. 10 ) {
$check_output = Cpanel::SafeRun::Errors::saferunallerrors( '/usr/local/cpanel/scripts/restartsrv_named', '--check', @html_args );
$status_code = $?;
last if $status_code == 0;
print "Waiting 5 seconds for named to start ($_/10)\n" if $cpverbose;
sleep(5);
}
if ( $status_code != 0 ) {
print "Named could not be restarted, any obvious config errors should show up below this line. \n";
my ( $ret_status, $status_info ) = $dnslib->checknamedconf($def_namedconf);
my $found_error = 0;
if ( $ret_status == 1 || $status_info =~ /rndc\.key/ ) {
# No error was detected, needs manual inspection
my $rndckey_file = $def_namedconf;
my $rndcconf_file = $def_namedconf;
$rndckey_file =~ s/\/named\.conf$/\/rndc.key/;
$rndcconf_file =~ s/\/named\.conf$/\/rndc.conf/;
foreach my $key_loc_file ( $rndckey_file, $def_namedconf ) {
if ( -s $key_loc_file == 0 ) {
print "Detected empty file at $key_loc_file \n";
$needrndckey = 1;
$found_error = 1;
last;
}
if ( open( my $keyf, '<', $key_loc_file ) ) {
while ( my $line = readline($keyf) ) {
if ( $line =~ m/secret\s+\"(.*)\"/i ) {
my $base64ok = is_base64($1);
if ( $base64ok != 1 ) {
print "There appears to be a problem with the base64 encoding of the rndckey in $key_loc_file .\n";
print "Will try to rebuild those files, \"connection refused\" errors are to be expected. \n";
$needrndckey = 1;
$found_error = 1;
last;
}
}
}
close($keyf);
}
else {
print "Could not open $key_loc_file : $! \n";
$needrndckey = 1;
}
}
if ( $found_error != 1 ) {
print "No critical problems found, will attempt to regenerate keys regardless.\n";
$needrndckey = 1;
}
}
elsif ( !$called_from_rebuilddnsconfig ) {
print "The named configuration appears to have errors:\n\t$status_info\n\nRunning /usr/local/cpanel/scripts/rebuilddnsconfig to repair it..\n";
# some config problem.. let's force a rebuild of named.conf and let it try again
my $opts = $cpverbose ? '-fv' : '-f';
exec( '/usr/local/cpanel/scripts/rebuilddnsconfig', $opts );
exit 0; # unreached
}
else {
print "WARNING: $def_namedconf appears to contain errors which could not be corrected automatically!\n";
print $status_info . "\n";
print "Please correct these errors manually and rerun /usr/local/cpanel/scripts/fixrndc\n";
exit 1;
}
}
}
######[ fix rndc info if needed ]##################################################################
# check if `rndc status` reports ok, fix if not or if -f flag is given to force it
if ( !defined( $options->{'force'} ) ) {
if ($cpverbose) {
print "Checking rndc by querying status\n";
}
# If "rndc status" does not report a failed connection, exit
if ( $dnslib->checkrndc() ) {
if ($cpverbose) {
print '!' x 50 . "\n";
print "rndc reported success. No changes will be made.\nUse the \"-f\" flag to force a check.\n";
print '!' x 50 . "\n";
}
exit;
}
}
my $removenamedconfkey = 0;
my $neednamedconfcontrols = 0;
my $removenamedconfcontrols = 0;
# rndc variables from rndc.conf
my ( $r_secret, $r_keyname );
my $rndcconf = $dnslib->find_rndcconf();
my $namedconf = $dnslib->{'namedconf'};
my $rndckeyfile = $dnslib->find_rndckey();
my $chrootdir = $dnslib->{'data'}{'chrootdir'};
my $zonedir = $dnslib->{'data'}{'zonefiledir'};
my $binduser = $dnslib->{'data'}{'binduser'};
my $bindgrp = $dnslib->{'data'}{'bindgroup'};
my $binduid = ( Cpanel::PwCache::getpwnam_noshadow($binduser) )[2];
my $bindgid = ( getgrnam($bindgrp) )[2];
$dnslib->{'data'}{'cpverbose'} = 1;
if ($zonedir) {
if ( !-e $zonedir . '/named.ca' ) {
system 'cp', '-fv', '/usr/local/cpanel/etc/named.ca', $zonedir . '/named.ca';
Cpanel::SafetyBits::safe_chown( $binduser, $bindgrp, $zonedir . '/named.ca' );
Cpanel::SafetyBits::safe_chmod( oct('0644'), $binduser, $zonedir . '/named.ca' );
}
}
# rndc variables from named.conf
my $key = 0;
my $controls = 0;
my ( $keykeyname, $keysecret, $inet, $allow, $controlskeyname, $rndc_include );
my ( $confstatus, $confresult ) = $dnslib->checknamedconf($namedconf);
######[ bail out if named.conf is currently fubar ]################################################
# Only bypass this check if there's only one error line and it matches the
# regex.
if ( !$confstatus && $confresult !~ /^.*rndc[.-]key.*$/ ) {
print <<"EOM";
!! fixrndc requires a syntactically correct $namedconf.
!! No changes were made to $namedconf. Problem was:
!! $confresult
EOM
exit();
}
######[ Make sure chroot directory is created ]####################################################
if ( $chrootdir ne '' ) {
print "Setting up chroot environment in $chrootdir\n" if $cpverbose;
$dnslib->setupbindchroot();
}
######[ Check rndc.conf for necessary settings ]###################################################
if ($rndckeyfile) {
( $r_secret, $r_keyname ) = $dnslib->loadrndckey();
if ( $r_secret eq ''
|| $r_keyname eq '' ) {
$needrndckey = 1;
}
}
else {
$needrndckey = 1;
}
#my $namedconf = $def_namedconf;
######[ Cannot proceed if named.conf is not located at this point ]################################
if ( !-e $namedconf ) {
die "named.conf not found, exiting";
}
######[ Check in existing named.conf to rcs ]######################################################
print "Checking in $namedconf to rcs system\n" if $cpverbose;
######[ If rndc.key needs to be generated, remove settings from named.conf ]#######################
if ($needrndckey) {
print "Need to create rndc.conf\n" if $cpverbose;
( $key, $keykeyname, $keysecret, $controls, $inet, $allow, $controlskeyname, $rndc_include ) = $dnslib->getrndcsettings($rndckeyfile);
# include line may already exist
$removenamedconfkey = 1 unless $rndc_include;
# check for broken control section
if ( $controlskeyname ne 'rndc-key' || $inet ne '127.0.0.1' || $allow ne 'localhost' ) {
$removenamedconfcontrols = 1;
$neednamedconfcontrols = 1;
}
}
else {
# Make sure named.conf rndc settings match
( $key, $keykeyname, $keysecret, $controls, $inet, $allow, $controlskeyname, $rndc_include ) = $dnslib->getrndcsettings($rndckeyfile);
if ( $keykeyname && $keysecret ) {
# if keyname in rndc.conf does not match keyname in named.conf,
# redo key clause in named.conf
if ( $keykeyname ne $r_keyname || $keysecret ne $r_secret ) {
$removenamedconfkey = 1;
}
}
elsif ( !$rndc_include ) {
$removenamedconfkey = 1;
}
# Controls section is needed by default
if ( $controlskeyname ne $r_keyname ) {
$removenamedconfcontrols = 1;
$neednamedconfcontrols = 1;
if ( $controlskeyname eq '' ) {
print "Controls section not found, adding ...\n" if $cpverbose;
}
else {
print "Controls keyname does not match rndc.conf keyname\n" if $cpverbose;
}
}
}
######[ Create rndc.key if needed ]###############################################################
if ($needrndckey) {
print "Creating rndc.conf\n";
my $named = Cpanel::FindBin::findbin('named');
unless ($named) {
die "named not located on system, please check the Bind installation";
}
my $rndcconfgen = $dnslib->find_rndcconfgen();
if ( $rndcconfgen eq '' ) {
die "rndc-confgen not located on system, please check the Bind installation";
}
my @rndc_confgen_args = (
'-a',
'-c', $rndckeyfile,
'-k', 'rndc-key',
'-r', '/dev/urandom',
);
# Bind < 9.10 (CentOS 6) does not support alternate hashing functions for the rndc key.
if ( Cpanel::SafeRun::Simple::saferun( $named, "-v" ) =~ /^BIND\s(\d+)\.(\d+)/ ) {
if ( $1 >= 9 && $2 >= 10 ) {
push @rndc_confgen_args, ( '-A', 'hmac-sha256' );
}
}
Cpanel::SafeRun::Errors::saferunallerrors( $rndcconfgen, @rndc_confgen_args );
Cpanel::SafetyBits::safe_chown( $binduser, $bindgrp, $rndckeyfile );
Cpanel::SafetyBits::safe_chmod( oct('0660'), $binduser, $rndckeyfile );
( $r_secret, $r_keyname ) = $dnslib->loadrndckey();
}
######[ Remove rndc.conf if needed ]################################################################
unlink $rndcconf if length $rndcconf && -f $rndcconf;
if ( $removenamedconfkey || $neednamedconfcontrols || $removenamedconfcontrols ) {
# open our tmp file to populate with rndc key controls and named.conf
open( NDF, ">", $namedconf . '.fixrndc' );
Cpanel::SafetyBits::safe_chown( $binduser, $bindgrp, "$namedconf.fixrndc" );
if ($removenamedconfkey) {
print "Including rndc key file to named.conf\n";
print NDF "include \"$rndckeyfile\"\;\n";
}
if ($neednamedconfcontrols) {
print "Adding controls clause\n";
print NDF "\ncontrols {\n";
print NDF "\tinet 127.0.0.1 allow { localhost; } keys { \"$r_keyname\"\; }\;\n";
print NDF "}\;\n\n";
}
######[ append entire named.conf to tmp file ]#####################################################
open( my $cur_ndc, '<', $namedconf );
my $in_removed_section = 0;
my $numbrace = 0;
my $commentkiller = Cpanel::CommentKiller->new;
while ( readline($cur_ndc) ) {
if ( $removenamedconfcontrols || $removenamedconfkey ) {
# Remove broken controls or keys sections if necessary
my $parsed = $commentkiller->parse($_) or next;
if ($in_removed_section) {
$numbrace += Cpanel::StringFunc::Count::get_curly_brace_count($parsed);
if ( $numbrace <= 0 ) {
$in_removed_section = 0;
}
next;
}
elsif ( $numbrace == 0 && ( ( $removenamedconfcontrols && $parsed =~ /^\s*controls/ ) || ( $removenamedconfkey && $parsed =~ /^\s*key/ ) ) ) {
$numbrace += Cpanel::StringFunc::Count::get_curly_brace_count($parsed);
$in_removed_section = 1;
next;
}
$numbrace += Cpanel::StringFunc::Count::get_curly_brace_count($parsed);
}
print NDF;
}
close($cur_ndc);
close(NDF);
if ( -e $namedconf . '.cache' ) {
unlink( $namedconf . '.cache' );
unlink( $namedconf . '.zonedir.cache' );
}
######[ move the fixrndc tmp file into place now that it is complete (once verified as ok) ]#######
( $confstatus, $confresult ) = $dnslib->checknamedconf( $namedconf . '.fixrndc' );
if ($confstatus) {
rename( $namedconf . '.fixrndc', $namedconf ) || print "Failed to copy $namedconf . '.fixrndc' to $namedconf : $!\n";
}
else {
print "New named.conf file does not pass syntax check. Leaving old file in place.\n" if $cpverbose;
}
}
######[ check rndc status again, restart named if needed ]#########################################
if ( $needrndckey || !$dnslib->checkrndc() ) {
print "Restarting named\n";
system( '/usr/local/cpanel/scripts/restartsrv_named', @html_args );
my $ok;
my $suspend = '/var/run/chkservd.suspend';
my $exists = -e $suspend;
# Suspend chkservd temporarily in case this takes longer than 5 minutes so
# we don't end up in a restart-restart loop.
Cpanel::FileUtils::TouchFile::touchfile($suspend);
for ( 1 .. 300 ) {
sleep(2);
$ok = $dnslib->checkrndc();
last if $ok;
}
unlink $suspend unless $exists;
if ( !$ok ) {
print "/usr/local/cpanel/scripts/fixrndc failed to fix the rndc key (or named is otherwise broken), please investigate manually\n";
exit 1;
}
}
print "The rndc key has been fixed successfully!\n" if $cpverbose;
exit;
sub is_base64 {
my $string = shift;
# Bail out if string length isn't in mutiples of 4 ...
return if length($string) % 4;
# Or if the string contains any unpermitted characters ...
return if $string !~ /^[=\+\/a-z0-9]+$/i;
return 1;
}
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