Re: [PATCH] (V4) Forcing DNS/NTP

6 Jun 2021

Hi,
thanks for implementing this idea.
Am 04.06.2021 um 14:17 schrieb Matthias Fischer:
...
There was not much feedback on the list, so I send this now. This is V4 - open for
discussion, opinions or (perhaps ;-) ) changes:
Originally triggered by:
https://community.ipfire.org/t/forcing-all-dns-traffic-from-the-lan-to-the-f...
Discussion:
https://community.ipfire.org/t/testing-dns-redirect-code-snippet/3888
Could fix(?):
https://bugzilla.ipfire.org/show_bug.cgi?id=11168
Changelog since V3:

Replaced 'green0'/'blue0' with '${GREEN_DEV}' / '${BLUE_DEV}' - these
 values are read from '/var/ipfire/ethernet/settings', thanks
 to "someone" for the hint (sorry, I didn't find the author)! ;-)

Replaced port numbers '123' / '53' with service names 'domain' / 'ntp' (dto.).

As mentioned on the list (05.03.2021, BB), 'well-behaving' requests are now
 handled through RETURN rules, others through REDIRECT.


Background (cited from BB, 06.03.2021):
"Concerning performance, we want to minimize the rule set to the amount
really necessary. On the other hand, it may be quicker to do just
a RETURN than a REDIRECT. The cases for the RETURN (DNS requests direct
to IPFire) should be nearly 100%. DNS and NTP servers are published
by DHCP or should be configured in the static case."
Sorry, I did not realize that this 'well-behaving' must be defined more 
exactly. See beyond.
...
I made it that way. Statistics during the last 62 days show that this
worked as intended. IMHO. I've sent a screenshot to the list (the other day) so
everyone could take a look.
That's my experience with the rules located in firewall.local, too.
...

Removed GUI links to DNS and NTP options in 'optionsfw.cgi'.

Moved creation of the iptable rules in '/etc/init.d/firewall' behind


'# WIRELESS chains'
Summary and functionality:
   These patches are controlled through "Firewall Options". They add new
   firewall-[DNS/NTP]_FORCED_ON_[INTERFACE]-options to '/var/ipfire/optionsfw/settings'.
   They activate/deactivate appropriate RETURN and REDIRECT rules through
   a new ctrl file ('/usr/local/bin/dnsntpctrl') and a new init file
   ('/etc/rc.d/init.d/dnsntp').
Default of all new rules is OFF (set in 'lfs/configroot').
   If set to ON, they REDIRECT all DNS and NTP requests (TCP/UDP) to the DNS and NTP
   servers specified in IPFire.
Flaw/ToDo:
   To make things work as I wanted I had to add a 'dnsntpctrl' file which calls the actual
   init file, 'dnsntp'. As I see it, this is actually an unnecessary detour.
   In fact I wanted to merge these two files in *one* C file, but this was beyond my
   capabilities, perhaps "someone" else knows how to program this.
Changed visibility (GUI, 'optionsfw.cgi') and some cosmetics:
   The corresponding interface options - including 'Masquerade ...' - are only visible if
   the respective interface actually exists.
   E.g.: if BLUE interface doesn't exist, there are no ON/OFF switches
   for 'DNS/NTP on BLUE' or logging options for BLUE available.
   Added text colors for better readability.
   Separated logging options per interface.
No reboot required:
   Rules can be switched ON/OFF without rebooting IPFire.
   Changes immedediately take effect after clicking 'Save'.
Changes to '/etc/rc.d/init.d/firewall' and '/etc/rc.d/init.d/dnsntpctrl':
   Fixed a 'trafic' typo.
   To avoid collisions with existing CUSTOM rules, I added a new PREROUTING
   chain: 'DNS_NTP_REDIRECT'.
   This chain is flushed by 'dnsntpctrl' prior applying the choosen settings.
Signed-off-by: Matthias Fischer matthias.fischer@ipfire.org
config/rootfiles/common/misc-progs |  1 +
  html/cgi-bin/optionsfw.cgi         | 90 ++++++++++++++++++++++++------
  langs/de/cgi-bin/de.pl             | 15 +++--
  langs/en/cgi-bin/en.pl             | 15 +++--
  lfs/configroot                     |  6 +-
  src/initscripts/system/dnsntp      | 43 ++++++++++++++
  src/initscripts/system/firewall    |  9 ++-
  src/misc-progs/Makefile            |  2 +-
  src/misc-progs/dnsntpctrl.c        | 19 +++++++
  9 files changed, 171 insertions(+), 29 deletions(-)
  create mode 100644 src/initscripts/system/dnsntp
  create mode 100644 src/misc-progs/dnsntpctrl.c

diff --git a/config/rootfiles/common/misc-progs b/config/rootfiles/common/misc-progs
index d6594b3f8..4bcb94812 100644
--- a/config/rootfiles/common/misc-progs
+++ b/config/rootfiles/common/misc-progs
@@ -5,6 +5,7 @@ usr/local/bin/captivectrl
  usr/local/bin/collectdctrl
  usr/local/bin/ddnsctrl
  usr/local/bin/dhcpctrl
+usr/local/bin/dnsntpctrl
  usr/local/bin/extrahdctrl
  usr/local/bin/fireinfoctrl
  usr/local/bin/firewallctrl
diff --git a/html/cgi-bin/optionsfw.cgi b/html/cgi-bin/optionsfw.cgi
index 321642e82..2059a03b3 100644
--- a/html/cgi-bin/optionsfw.cgi
+++ b/html/cgi-bin/optionsfw.cgi
@@ -50,6 +50,7 @@ if ($settings{'ACTION'} eq $Lang::tr{'save'}) {
   	$errormessage .= $Lang::tr{'new optionsfw later'};
   	&General::writehash($filename, %settings);             # Save good settings
   	system("/usr/local/bin/firewallctrl");

system("/usr/local/bin/dnsntpctrl >/dev/null 2>&1");

}else{
if ($settings{'POLICY'} ne ''){
	$fwdfwsettings{'POLICY'} = $settings{'POLICY'};

@@ -65,6 +66,7 @@ if ($settings{'ACTION'} eq $Lang::tr{'save'}) {
   	&General::writehash("${General::swroot}/firewall/settings", %fwdfwsettings);
   	&General::readhash("${General::swroot}/firewall/settings", %fwdfwsettings);
   	system("/usr/local/bin/firewallctrl");

system("/usr/local/bin/dnsntpctrl >/dev/null 2>&1");

}
&General::readhash($filename, %settings);             # Load good settings
}

@@ -140,6 +142,18 @@ $selected{'MASQUERADE_ORANGE'}{$settings{'MASQUERADE_ORANGE'}} = 'selected="sele
  $selected{'MASQUERADE_BLUE'}{'off'} = '';
  $selected{'MASQUERADE_BLUE'}{'on'} = '';
  $selected{'MASQUERADE_BLUE'}{$settings{'MASQUERADE_BLUE'}} = 'selected="selected"';
+$checked{'DNS_FORCE_ON_GREEN'}{'off'} = '';
+$checked{'DNS_FORCE_ON_GREEN'}{'on'} = '';
+$checked{'DNS_FORCE_ON_GREEN'}{$settings{'DNS_FORCE_ON_GREEN'}} = "checked='checked'";
+$checked{'DNS_FORCE_ON_BLUE'}{'off'} = '';
+$checked{'DNS_FORCE_ON_BLUE'}{'on'} = '';
+$checked{'DNS_FORCE_ON_BLUE'}{$settings{'DNS_FORCE_ON_BLUE'}} = "checked='checked'";
+$checked{'NTP_FORCE_ON_GREEN'}{'off'} = '';
+$checked{'NTP_FORCE_ON_GREEN'}{'on'} = '';
+$checked{'NTP_FORCE_ON_GREEN'}{$settings{'NTP_FORCE_ON_GREEN'}} = "checked='checked'";
+$checked{'NTP_FORCE_ON_BLUE'}{'off'} = '';
+$checked{'NTP_FORCE_ON_BLUE'}{'on'} = '';
+$checked{'NTP_FORCE_ON_BLUE'}{$settings{'NTP_FORCE_ON_BLUE'}} = "checked='checked'";
&Header::openbox('100%', 'center',);
  print "<form method='post' action='$ENV{'SCRIPT_NAME'}'>";
@@ -189,13 +203,44 @@ END
  END
   }

print <<END

+print <<END;

<table width='95%' cellspacing='0'>

<tr bgcolor='$color{'color20'}'></tr>


<tr>&nbsp;</tr>


	<td colspan='2' align='left'><b>$Lang::tr{'fw green'}</b></td>


</tr>


<tr><td align='left' width='60%'>$Lang::tr{'dns force on green'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DNS_FORCE_ON_GREEN' value='on' $checked{'DNS_FORCE_ON_GREEN'}{'on'} />/


																				<input type='radio' name='DNS_FORCE_ON_GREEN' value='off' $checked{'DNS_FORCE_ON_GREEN'}{'off'} /> $Lang::tr{'off'}</td></tr>


<tr><td align='left' width='60%'>$Lang::tr{'ntp force on green'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='NTP_FORCE_ON_GREEN' value='on' $checked{'NTP_FORCE_ON_GREEN'}{'on'} />/


																				<input type='radio' name='NTP_FORCE_ON_GREEN' value='off' $checked{'NTP_FORCE_ON_GREEN'}{'off'} /> $Lang::tr{'off'}</td></tr>



+END


if (&Header::blue_used()) {
print <<END;


<table width='95%' cellspacing='0'>


<tr bgcolor='$color{'color20'}'><td colspan='2' align='left'><b>$Lang::tr{'fw blue'}</b></td></tr>


<tr>&nbsp;</tr>


	<tr>


	<tr><td align='left' width='60%'>$Lang::tr{'dns force on blue'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DNS_FORCE_ON_BLUE' value='on' $checked{'DNS_FORCE_ON_BLUE'}{'on'} />/


																				<input type='radio' name='DNS_FORCE_ON_BLUE' value='off' $checked{'DNS_FORCE_ON_BLUE'}{'off'} /> $Lang::tr{'off'}</td></tr>


	<tr><td align='left' width='60%'>$Lang::tr{'ntp force on blue'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='NTP_FORCE_ON_BLUE' value='on' $checked{'NTP_FORCE_ON_BLUE'}{'on'} />/


																				<input type='radio' name='NTP_FORCE_ON_BLUE' value='off' $checked{'NTP_FORCE_ON_BLUE'}{'off'} /> $Lang::tr{'off'}</td></tr>


	<tr><td align='left' width='60%'>$Lang::tr{'drop proxy'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DROPPROXY' value='on' $checked{'DROPPROXY'}{'on'} />/


																				<input type='radio' name='DROPPROXY' value='off' $checked{'DROPPROXY'}{'off'} /> $Lang::tr{'off'}</td></tr>


	<tr><td align='left' width='60%'>$Lang::tr{'drop samba'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DROPSAMBA' value='on' $checked{'DROPSAMBA'}{'on'} />/


																				<input type='radio' name='DROPSAMBA' value='off' $checked{'DROPSAMBA'}{'off'} /> $Lang::tr{'off'}</td></tr>


	</td>


	</tr>



+END

}

print <<END;</table>



<br>



<br />


-<table width='95%' cellspacing='0'>
-<tr bgcolor='$color{'color20'}'><td colspan='2' align='left'><b>$Lang::tr{'fw logging'}</b></td></tr>

<table width='95%' cellspacing='0'>



+<tr bgcolor='$color{'color20'}'><td colspan='2' align='left'><b>$Lang::tr{'fw logging red'}</b></td></tr>
  <tr><td align='left' width='60%'>$Lang::tr{'drop newnotsyn'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DROPNEWNOTSYN' value='on' $checked{'DROPNEWNOTSYN'}{'on'} />/
   																					<input type='radio' name='DROPNEWNOTSYN' value='off' $checked{'DROPNEWNOTSYN'}{'off'} /> $Lang::tr{'off'}</td></tr>
  <tr><td align='left' width='60%'>$Lang::tr{'drop input'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DROPINPUT' value='on' $checked{'DROPINPUT'}{'on'} />/
@@ -206,21 +251,30 @@ END
   																					<input type='radio' name='DROPOUTGOING' value='off' $checked{'DROPOUTGOING'}{'off'} /> $Lang::tr{'off'}</td></tr>
  <tr><td align='left' width='60%'>$Lang::tr{'drop portscan'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DROPPORTSCAN' value='on' $checked{'DROPPORTSCAN'}{'on'} />/
   																					<input type='radio' name='DROPPORTSCAN' value='off' $checked{'DROPPORTSCAN'}{'off'} /> $Lang::tr{'off'}</td></tr>
-<tr><td align='left' width='60%'>$Lang::tr{'drop wirelessinput'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DROPWIRELESSINPUT' value='on' $checked{'DROPWIRELESSINPUT'}{'on'} />/
+END
+
+	if (&Header::blue_used()) {
+		print <<END;
+	</table>
+
+	<br />
+
+		<table width='95%' cellspacing='0'>
+<tr bgcolor='$color{'color20'}'><td colspan='2' align='left'><b>$Lang::tr{'fw logging blue'}</b></td></tr>
+			<tr>
+			<tr><td align='left' width='60%'>$Lang::tr{'drop wirelessinput'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DROPWIRELESSINPUT' value='on' $checked{'DROPWIRELESSINPUT'}{'on'} />/
   																					<input type='radio' name='DROPWIRELESSINPUT' value='off' $checked{'DROPWIRELESSINPUT'}{'off'} /> $Lang::tr{'off'}</td></tr>
-<tr><td align='left' width='60%'>$Lang::tr{'drop wirelessforward'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DROPWIRELESSFORWARD' value='on' $checked{'DROPWIRELESSFORWARD'}{'on'} />/
+			<tr><td align='left' width='60%'>$Lang::tr{'drop wirelessforward'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DROPWIRELESSFORWARD' value='on' $checked{'DROPWIRELESSFORWARD'}{'on'} />/
   																					<input type='radio' name='DROPWIRELESSFORWARD' value='off' $checked{'DROPWIRELESSFORWARD'}{'off'} /> $Lang::tr{'off'}</td></tr>
-</table>
-<br/>
+			</tr>
+END
+	}
+
+	print <<END;
+	</table>
+
+	<br />
-<table width='95%' cellspacing='0'>
-<tr bgcolor='$color{'color20'}'><td colspan='2' align='left'><b>$Lang::tr{'fw blue'}</b></td></tr>
-<tr><td align='left' width='60%'>$Lang::tr{'drop proxy'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DROPPROXY' value='on' $checked{'DROPPROXY'}{'on'} />/

																				<input type='radio' name='DROPPROXY' value='off' $checked{'DROPPROXY'}{'off'} /> $Lang::tr{'off'}</td></tr>



-<tr><td align='left' width='60%'>$Lang::tr{'drop samba'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='DROPSAMBA' value='on' $checked{'DROPSAMBA'}{'on'} />/

																				<input type='radio' name='DROPSAMBA' value='off' $checked{'DROPSAMBA'}{'off'} /> $Lang::tr{'off'}</td></tr>



-</table>
-<br>
  <table width='95%' cellspacing='0'>
  <tr bgcolor='$color{'color20'}'><td colspan='2' align='left'><b>$Lang::tr{'fw settings'}</b></td></tr>
  <tr><td align='left' width='60%'>$Lang::tr{'fw settings color'}</td><td align='left'>$Lang::tr{'on'} <input type='radio' name='SHOWCOLORS' value='on' $checked{'SHOWCOLORS'}{'on'} />/
@@ -252,7 +306,7 @@ END
  <br />
  <table width='100%' cellspacing='0'>
-<tr><td align='right'><form method='post' action='$ENV{'SCRIPT_NAME'}'>
+<tr><td align='center'><form method='post' action='$ENV{'SCRIPT_NAME'}'>
  <input type='submit' name='ACTION' value='$Lang::tr{'save'}' />
  </form></td></tr>
  </table>
@@ -278,7 +332,7 @@ print <<END;
       <input type='submit' name='ACTION' value='$Lang::tr{'save'}' /><input type='hidden' name='defpol' value='1'></td>
  END
   print "</tr></table></form>";
-	print"<br><br>";
+	print"<br /><br />";
   print <<END;
   <form method='post' action='$ENV{'SCRIPT_NAME'}'>
   <table width='100%' border='0'>
diff --git a/langs/de/cgi-bin/de.pl b/langs/de/cgi-bin/de.pl
index 0bc579cd2..51e65b903 100644
--- a/langs/de/cgi-bin/de.pl
+++ b/langs/de/cgi-bin/de.pl
@@ -835,6 +835,8 @@
  'dns error 0' => 'Die IP Adresse vom <strong>primären</strong> DNS Server ist nicht gültig, bitte überprüfen Sie Ihre Eingabe!<br />Die eingegebene <strong>sekundären</strong> DNS Server Adresse ist jedoch gültig.<br />',
  'dns error 01' => 'Die eingegebene IP Adresse des <strong>primären</strong> wie auch des <strong>sekundären</strong> DNS-Servers sind nicht gültig, bitte überprüfen Sie Ihre Eingaben!',
  'dns error 1' => 'Die IP Adresse vom <strong>sekundären</strong> DNS Server ist nicht gültig, bitte überprüfen Sie Ihre Eingabe!<br />Die eingegebene <strong>primäre</strong> DNS Server Adresse ist jedoch gültig.',
+'dns force on blue' => 'Erzwinge lokale DNS-Server',
+'dns force on green' => 'Erzwinge lokale DNS-Server',
  'dns forward disable dnssec' => 'DNSSEC deaktivieren (nicht empfohlen)',
  'dns forwarding dnssec disabled notice' => '(DNSSEC deaktiviert)',
  'dns header' => 'DNS Server Adressen zuweisen nur mit DHCP an red0',
@@ -1101,9 +1103,12 @@
  'from email server' => 'Von E-Mail-Server',
  'from email user' => 'Von E-Mail-Benutzer',
  'from warn email bad' => 'Von E-Mail-Adresse ist nicht gültig',
-'fw blue' => 'Firewalloptionen für das Blaue Interface',
+'fw blue' => 'Firewalloptionen für das <font color=\'#0000FF\'>BLAUE</font> Interface',
  'fw default drop' => 'Firewallrichtlinie',
+'fw green' => 'Firewalloptionen für das <font color=\'#339933\'>GRÜNE</font> Interface',
  'fw logging' => 'Firewallprotokollierung',
+'fw logging blue' => 'Firewallprotokollierung (<font color=\'#0000FF\'>BLAU</font>)',
+'fw logging red' => 'Firewallprotokollierung (<font color=\'#993333\'>ROT</font>)',
  'fw settings' => 'Firewalleinstellungen',
  'fw settings color' => 'Farben in Regeltabelle anzeigen',
  'fw settings dropdown' => 'Alle Netzwerke auf Regelerstellungsseite anzeigen',
@@ -1643,9 +1648,9 @@
  'map to guest' => 'Map to Guest',
  'march' => 'März',
  'marked' => 'Markiert',
-'masquerade blue' => 'NAT auf BLAU',
-'masquerade green' => 'NAT auf GRÜN',
-'masquerade orange' => 'NAT auf ORANGE',
+'masquerade blue' => 'NAT auf <b><font color=\'#0000FF\'>BLAU</font></b>',
+'masquerade green' => 'NAT auf <b><font color=\'#339933\'>GRÜN</font></b>',
+'masquerade orange' => 'NAT auf <b><font color =\'#FF9933\'>ORANGE</font></b>',
  'masquerading' => 'Masquerading/NAT',
  'masquerading disabled' => 'NAT ausgeschaltet',
  'masquerading enabled' => 'NAT eingeschaltet',
@@ -1813,6 +1818,8 @@
  'november' => 'November',
  'ntp common settings' => 'Allgemeine Einstellungen',
  'ntp configuration' => 'Zeitserverkonfiguration',
+'ntp force on blue' => 'Erzwinge lokale NTP-Server',
+'ntp force on green' => 'Erzwinge lokale NTP-Server',
  'ntp must be enabled to have clients' => 'Um Clients annehmen zu können, muss NTP vorher aktiviert sein.',
  'ntp server' => 'NTP-Server',
  'ntp sync' => 'Synchronisation',
diff --git a/langs/en/cgi-bin/en.pl b/langs/en/cgi-bin/en.pl
index 1c69b3798..390b2d026 100644
--- a/langs/en/cgi-bin/en.pl
+++ b/langs/en/cgi-bin/en.pl
@@ -858,6 +858,8 @@
  'dns error 0' => 'The IP address of the <strong>primary</strong> DNS server is not valid, please check your entries!<br />The entered <strong>secondary</strong> DNS server address is valid.',
  'dns error 01' => 'The entered IP address of the <strong>primary</strong> and <strong>secondary</strong> DNS server are not valid, please check your entries!',
  'dns error 1' => 'The IP address of the <strong>secondary</strong> DNS server is not valid, please check your entries!<br />The entered <strong>primary</strong> DNS server address is valid.',
+'dns force on blue' => 'Force DNS to use local DNS servers',
+'dns force on green' => 'Force DNS to use local DNS servers',
  'dns forward disable dnssec' => 'Disable DNSSEC (dangerous)',
  'dns forwarding dnssec disabled notice' => '(DNSSEC disabled)',
  'dns header' => 'Assign DNS server addresses only for DHCP on red0',
@@ -1128,9 +1130,12 @@
  'from email server' => 'From Email server',
  'from email user' => 'From e-mail user',
  'from warn email bad' => 'From e-mail address is not valid',
-'fw blue' => 'Firewall options for BLUE interface',
+'fw blue' => 'Firewall options for <font color=\'#0000FF\'>BLUE</font> Interface',
  'fw default drop' => 'Firewall policy',
+'fw green' => 'Firewall options for <font color=\'#339933\'>GREEN</font> Interface',
  'fw logging' => 'Firewall logging',
+'fw logging blue' => 'Firewall logging (<font color=\'#0000FF\'>BLUE</font>)',
+'fw logging red' => 'Firewall logging (<font color=\'#993333\'>RED</font>)',
  'fw settings' => 'Firewall settings',
  'fw settings color' => 'Show colors in ruletable',
  'fw settings dropdown' => 'Show all networks on rulecreation site',
@@ -1675,9 +1680,9 @@
  'map to guest' => 'Map to Guest',
  'march' => 'March',
  'marked' => 'Marked',
-'masquerade blue' => 'Masquerade BLUE',
-'masquerade green' => 'Masquerade GREEN',
-'masquerade orange' => 'Masquerade ORANGE',
+'masquerade blue' => 'Masquerade <b><font color=\'#0000FF\'>BLUE</font></b>',
+'masquerade green' => 'Masquerade <b><font color=\'#339933\'>GREEN</font></b>',
+'masquerade orange' => 'Masquerade <b><font color=\'#FF9933\'>ORANGE</font></b>',
  'masquerading' => 'Masquerading',
  'masquerading disabled' => 'Masquerading disabled',
  'masquerading enabled' => 'Masquerading enabled',
@@ -1847,6 +1852,8 @@
  'november' => 'November',
  'ntp common settings' => 'Common settings',
  'ntp configuration' => 'NTP Configuration',
+'ntp force on blue' => 'Force NTP to use local NTP servers',
+'ntp force on green' => 'Force NTP to use local NTP servers',
  'ntp must be enabled to have clients' => 'NTP must be enabled to have clients.',
  'ntp server' => 'NTP Server',
  'ntp sync' => 'Synchronization',
diff --git a/lfs/configroot b/lfs/configroot
index c528bd6d9..6cc376ff0 100644
--- a/lfs/configroot
+++ b/lfs/configroot
@@ -1,7 +1,7 @@
  ###############################################################################
  #                                                                             #
  # IPFire.org - A linux based firewall                                         #
-# Copyright (C) 2007-2021  IPFire Team  <info@ipfire.org>                     #
+# Copyright (C) 2007-2018  IPFire Team  <info@ipfire.org>                     #
  #                                                                             #
  # This program is free software: you can redistribute it and/or modify        #
  # it under the terms of the GNU General Public License as published by        #
@@ -129,6 +129,10 @@ $(TARGET) :
   echo  "SHOWDROPDOWN=off"	>> $(CONFIG_ROOT)/optionsfw/settings
   echo  "DROPWIRELESSINPUT=on"	>> $(CONFIG_ROOT)/optionsfw/settings
   echo  "DROPWIRELESSFORWARD=on"	>> $(CONFIG_ROOT)/optionsfw/settings
+	echo  "DNS_FORCE_ON_GREEN=off"	>> $(CONFIG_ROOT)/optionsfw/settings
+	echo  "DNS_FORCE_ON_BLUE=off"	>> $(CONFIG_ROOT)/optionsfw/settings
+	echo  "NTP_FORCE_ON_GREEN=off"	>> $(CONFIG_ROOT)/optionsfw/settings
+	echo  "NTP_FORCE_ON_BLUE=off"	>> $(CONFIG_ROOT)/optionsfw/settings
   echo  "POLICY=MODE2"		>> $(CONFIG_ROOT)/firewall/settings
   echo  "POLICY1=MODE2"		>> $(CONFIG_ROOT)/firewall/settings
   echo  "USE_ISP_NAMESERVERS=on"  >> $(CONFIG_ROOT)/dns/settings
diff --git a/src/initscripts/system/dnsntp b/src/initscripts/system/dnsntp
new file mode 100644
index 000000000..54fdfc685
--- /dev/null
+++ b/src/initscripts/system/dnsntp
@@ -0,0 +1,43 @@
+#!/bin/sh
+########################################################################
+# Begin $rc_base/init.d/dnsntp
+#
+# Description : dnsntp init script for DNS/NTP rules only
+#
+########################################################################
+
+# flush chain
+iptables -t nat -F DNS_NTP_REDIRECT
+
+eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
+eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
+
The 'well-behaving' request destinations should be DNS1_GREEN, 
DNS2_GREEN, DNS1_BLUE, DNS2_BLUE ( stored in /var/ipfire/dhcp/settings 
and set in the dhcp.cgi ).
If they are defined and distrubited by DHCP or set by other mechanism.
Is GREEN_ADDRESS / BLUE_ADDRESS the desired destination otherwise?
...
+# Force DNS REDIRECTs on GREEN (udp, tcp, 53)
+if [ "$DNS_FORCE_ON_GREEN" == "on" ]; then

iptables -t nat -A DNS_NTP_REDIRECT -i ${GREEN_DEV} -d ${GREEN_ADDRESS} -p udp -m udp --dport domain -j RETURN
iptables -t nat -A DNS_NTP_REDIRECT -i ${GREEN_DEV} -p udp -m udp --dport domain -j REDIRECT
iptables -t nat -A DNS_NTP_REDIRECT -i ${GREEN_DEV} -d ${GREEN_ADDRESS} -p tcp -m tcp --dport domain -j RETURN
iptables -t nat -A DNS_NTP_REDIRECT -i ${GREEN_DEV} -p tcp -m tcp --dport domain -j REDIRECT

+fi



+# Force DNS REDIRECTs on BLUE (udp, tcp, 53)
+if [ "$DNS_FORCE_ON_BLUE" == "on" ]; then

iptables -t nat -A DNS_NTP_REDIRECT -i ${BLUE_DEV} -d ${BLUE_ADDRESS} -p udp -m udp --dport domain -j RETURN
iptables -t nat -A DNS_NTP_REDIRECT -i ${BLUE_DEV} -p udp -m udp --dport domain -j REDIRECT
iptables -t nat -A DNS_NTP_REDIRECT -i ${BLUE_DEV} -d ${BLUE_ADDRESS} -p tcp -m tcp --dport domain -j RETURN
iptables -t nat -A DNS_NTP_REDIRECT -i ${BLUE_DEV} -p tcp -m tcp --dport domain -j REDIRECT

+fi



See above.
Regards,
Bernhard
...
+# Force NTP REDIRECTs on GREEN (udp, 123)
+if [ "$NTP_FORCE_ON_GREEN" == "on" ]; then

iptables -t nat -A DNS_NTP_REDIRECT -i ${GREEN_DEV} -d ${GREEN_ADDRESS} -p udp -m udp --dport ntp -j RETURN
iptables -t nat -A DNS_NTP_REDIRECT -i ${GREEN_DEV} -p udp -m udp --dport ntp -j REDIRECT

+fi



+# Force DNS REDIRECTs on BLUE (udp, 123)
+if [ "$NTP_FORCE_ON_BLUE" == "on" ]; then

iptables -t nat -A DNS_NTP_REDIRECT -i ${BLUE_DEV} -d ${BLUE_ADDRESS} -p udp -m udp --dport ntp -j RETURN
iptables -t nat -A DNS_NTP_REDIRECT -i ${BLUE_DEV} -p udp -m udp --dport ntp -j REDIRECT

+fi



+# End $rc_base/init.d/dnsntp
diff --git a/src/initscripts/system/firewall b/src/initscripts/system/firewall
index 1e558ee86..047946a86 100644
--- a/src/initscripts/system/firewall
+++ b/src/initscripts/system/firewall
@@ -218,7 +218,7 @@ iptables_init() {
   iptables -A INPUT -j LOCATIONBLOCK
   iptables -A FORWARD -j LOCATIONBLOCK

# trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything


# traffic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
iptables -N IPSECINPUT
iptables -N IPSECFORWARD
iptables -N IPSECOUTPUT

@@ -242,6 +242,10 @@ iptables_init() {
   iptables -N WIRELESSFORWARD
   iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD

# Redirecting DNS and NTP requests
iptables -t nat -N DNS_NTP_REDIRECT
iptables -t nat -A PREROUTING -j DNS_NTP_REDIRECT
# OpenVPN
 iptables -N OVPNINPUT
 iptables -A INPUT -j OVPNINPUT

@@ -320,6 +324,9 @@ iptables_init() {
   # run captivectrl
   /usr/local/bin/captivectrl

# run dnsntpctrl
/usr/local/bin/dnsntpctrl
# POLICY CHAIN
 iptables -N POLICYIN
 iptables -A INPUT -j POLICYIN

diff --git a/src/misc-progs/Makefile b/src/misc-progs/Makefile
index 7c3ef7529..229d122d6 100644
--- a/src/misc-progs/Makefile
+++ b/src/misc-progs/Makefile
@@ -30,7 +30,7 @@ SUID_PROGS = squidctrl sshctrl ipfirereboot \
   wirelessctrl getipstat qosctrl \
   redctrl syslogdctrl extrahdctrl sambactrl \
   smartctrl clamavctrl addonctrl pakfire mpfirectrl wlanapctrl \

setaliases urlfilterctrl updxlratorctrl fireinfoctrl rebuildroutes \


setaliases urlfilterctrl updxlratorctrl fireinfoctrl rebuildroutes dnsntpctrl \
getconntracktable wirelessclient torctrl ddnsctrl unboundctrl \
captivectrl

diff --git a/src/misc-progs/dnsntpctrl.c b/src/misc-progs/dnsntpctrl.c
new file mode 100644
index 000000000..f2a3b89e3
--- /dev/null
+++ b/src/misc-progs/dnsntpctrl.c
@@ -0,0 +1,19 @@
+/* This file is part of the IPFire Firewall.






This program is distributed under the terms of the GNU General Public



Licence.  See the file COPYING for details.






*/


+#include <stdlib.h>
+#include "setuid.h"



+int main(void)
+{

if (!(initsetuid()))
exit(1);



safe_system("/etc/rc.d/init.d/dnsntp >/dev/null 2>&1");

return 0;

+}

    

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Re: [PATCH] (V4) Forcing DNS/NTP

Signed-off-by: Matthias Fischer matthias.fischer@ipfire.org