Aw: Re: [PATCH] (V3) Forcing DNS/NTP

[Bernhard Bitsch <Bernhard.Bitsch@gmx.de>]

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For forcing DNS we generate ( for example )
	iptables -t nat -A DNS_NTP_REDIRECT -i green0 -p udp -m udp --dport 53 -j REDIRECT
To filter allowed DNS requests there is a rule
	iptables -t nat -A DNS_NTP_REDIRECT -i green0 -d ${GREEN_ADDRESS} -p udp -m udp --dport 53 -j RETURN
To get ${GREEN_ADDRESS} dnsntp needs an additional
        eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)

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 servrs are published by DHCP or should be configured in the static case.

Hope this makes it clear enough.

Best,
Bernhard

> Gesendet: Samstag, 06. März 2021 um 21:51 Uhr
> Von: "Jon Murphy" <jcmurphy26(a)gmail.com>
> An: "Bernhard Bitsch" <Bernhard.Bitsch(a)gmx.de>
> Betreff: Re: [PATCH] (V3) Forcing DNS/NTP
>
> > I mean the extra rules for requests client-->IPFire:53.
> > These are 'well-behaving' and must/should not be redirected. Didn't measure if the performance is equal with or without these extra rules.
> 
> How do we determine if a 'well-behaving' client is being redirected?  Or how do we measure performance?
> 
> When I tried to measure DNS "speed" in the past, the cache gets in there and makes every look like 38 to 44 ms.
> 
> > On Mar 6, 2021, at 1:47 PM, Bernhard Bitsch <Bernhard.Bitsch(a)gmx.de> wrote:
> > 
> > Hi,
> > 
> >> Gesendet: Freitag, 05. März 2021 um 23:49 Uhr
> >> Von: "Matthias Fischer" <matthias.fischer(a)ipfire.org>
> >> An: "Bernhard Bitsch" <Bernhard.Bitsch(a)gmx.de>
> >> Cc: development(a)lists.ipfire.org
> >> Betreff: Re: Aw: [PATCH] (V3) Forcing DNS/NTP
> >> 
> >> Hi,
> >> 
> >> On 05.03.2021 21:45, Bernhard Bitsch wrote:
> >>> Hi,
> >>> 
> >>> at a first glance I think, the code implements the ideas of the community discussions.
> >> 
> >> Thanks - but unfortunately I'm not quite satisfied with my results yet
> >> because I didn't manage to merge the init and the ctrl-file in *one* C
> >> program. The whole is running as I want but... ;-)
> >> 
> >>> Just one annotation. As mentioned in a post, it could help to honor 'well-behaving' requests ( to IPFire ) by a RETURN.
> >> 
> >> -v please. I don't know if I get this (the translation english =>
> >> german) right.
> >> If you mean that I asked for some tips and got some, than of course:
> >> many thanks to everybody!
> >> 
> > Sorry if I wasn't specific enough.
> > I mean the extra rules for requests client-->IPFire:53.
> > These are 'well-behaving' and must/should not be redirected. Didn't measure if the performance is equal with or without these extra rules.
> > 
> > Best,
> > Bernhard
> >> Best,
> >> Matthias
> >> 
> >>> Regards,
> >>> Bernhard
> >>> 
> >>>> Gesendet: Freitag, 05. März 2021 um 20:40 Uhr
> >>>> Von: "Matthias Fischer" <matthias.fischer(a)ipfire.org>
> >>>> An: development(a)lists.ipfire.org
> >>>> Betreff: [PATCH] (V3) Forcing DNS/NTP
> >>>> 
> >>>> Originally triggered by:
> >>>> https://community.ipfire.org/t/forcing-all-dns-traffic-from-the-lan-to-the-firewall/3512
> >>>> 
> >>>> Current discussion:
> >>>> https://community.ipfire.org/t/testing-dns-redirect-code-snippet/3888
> >>>> 
> >>>> 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 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. GUI links to DNS and NTP options were added to make
> >>>>  this more transparent.
> >>>> 
> >>>>  Flaw/ToDo:
> >>>>  To make things work as I wanted I had to add a 'dnsntpctrl' file which calls the actual
> >>>>  init file, 'dnsntp'. 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.
> >>>>  If BLUE interface doesn't exist, there are no ON/OFF switches for 'DNS/NTP on BLUE'
> >>>>  or logging options for BLUE available (e.g.).
> >>>>  Added text colors for better readability and links to DNS and NTP GUI.
> >>>>  Separated logging options per interface.
> >>>> 
> >>>> No reboot required:
> >>>>  Rules can be switched ON/OFF without rebooting IPFire.
> >>>>  Changes immedediatly take effect after clicking 'Save'.
> >>>> 
> >>>> Changes to '/etc/rc.d/init.d/firewall':
> >>>>  To avoid collisions with possibly existing CUSTOM rules, I added a new PREROUTING
> >>>>  chain: DNS_NTP_REDIRECT.
> >>>>  This chain is flushed by the init file before before the desired settings are applied.
> >>>>  Corrected a 'trafic' typo.
> >>>> 
> >>>> Signed-off-by: Matthias Fischer <matthias.fischer(a)ipfire.org>
> >>>> ---
> >>>> config/rootfiles/common/aarch64/initscripts  |  1 +
> >>>> config/rootfiles/common/armv5tel/initscripts |  1 +
> >>>> config/rootfiles/common/i586/initscripts     |  1 +
> >>>> config/rootfiles/common/misc-progs           |  1 +
> >>>> config/rootfiles/common/x86_64/initscripts   |  1 +
> >>>> html/cgi-bin/optionsfw.cgi                   | 92 ++++++++++++++++----
> >>>> langs/de/cgi-bin/de.pl                       | 15 +++-
> >>>> langs/en/cgi-bin/en.pl                       | 15 +++-
> >>>> lfs/configroot                               |  4 +
> >>>> src/initscripts/system/dnsntp                | 36 ++++++++
> >>>> src/initscripts/system/firewall              |  9 +-
> >>>> src/misc-progs/Makefile                      |  2 +-
> >>>> src/misc-progs/dnsntpctrl.c                  | 19 ++++
> >>>> 13 files changed, 168 insertions(+), 29 deletions(-)
> >>>> create mode 100644 src/initscripts/system/dnsntp
> >>>> create mode 100644 src/misc-progs/dnsntpctrl.c
> >>>> 
> >>>> diff --git a/config/rootfiles/common/aarch64/initscripts b/config/rootfiles/common/aarch64/initscripts
> >>>> index 800005966..f38a3a294 100644
> >>>> --- a/config/rootfiles/common/aarch64/initscripts
> >>>> +++ b/config/rootfiles/common/aarch64/initscripts
> >>>> @@ -20,6 +20,7 @@ etc/rc.d/init.d/conntrackd
> >>>> etc/rc.d/init.d/console
> >>>> etc/rc.d/init.d/dhcp
> >>>> etc/rc.d/init.d/dhcrelay
> >>>> +etc/rc.d/init.d/dnsntp
> >>>> etc/rc.d/init.d/fcron
> >>>> etc/rc.d/init.d/fireinfo
> >>>> etc/rc.d/init.d/firewall
> >>>> diff --git a/config/rootfiles/common/armv5tel/initscripts b/config/rootfiles/common/armv5tel/initscripts
> >>>> index 800005966..f38a3a294 100644
> >>>> --- a/config/rootfiles/common/armv5tel/initscripts
> >>>> +++ b/config/rootfiles/common/armv5tel/initscripts
> >>>> @@ -20,6 +20,7 @@ etc/rc.d/init.d/conntrackd
> >>>> etc/rc.d/init.d/console
> >>>> etc/rc.d/init.d/dhcp
> >>>> etc/rc.d/init.d/dhcrelay
> >>>> +etc/rc.d/init.d/dnsntp
> >>>> etc/rc.d/init.d/fcron
> >>>> etc/rc.d/init.d/fireinfo
> >>>> etc/rc.d/init.d/firewall
> >>>> diff --git a/config/rootfiles/common/i586/initscripts b/config/rootfiles/common/i586/initscripts
> >>>> index 18c5a897a..a3a2b47f7 100644
> >>>> --- a/config/rootfiles/common/i586/initscripts
> >>>> +++ b/config/rootfiles/common/i586/initscripts
> >>>> @@ -20,6 +20,7 @@ etc/rc.d/init.d/conntrackd
> >>>> etc/rc.d/init.d/console
> >>>> etc/rc.d/init.d/dhcp
> >>>> etc/rc.d/init.d/dhcrelay
> >>>> +etc/rc.d/init.d/dnsntp
> >>>> etc/rc.d/init.d/fcron
> >>>> etc/rc.d/init.d/fireinfo
> >>>> etc/rc.d/init.d/firewall
> >>>> 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/config/rootfiles/common/x86_64/initscripts b/config/rootfiles/common/x86_64/initscripts
> >>>> index 18c5a897a..a3a2b47f7 100644
> >>>> --- a/config/rootfiles/common/x86_64/initscripts
> >>>> +++ b/config/rootfiles/common/x86_64/initscripts
> >>>> @@ -20,6 +20,7 @@ etc/rc.d/init.d/conntrackd
> >>>> etc/rc.d/init.d/console
> >>>> etc/rc.d/init.d/dhcp
> >>>> etc/rc.d/init.d/dhcrelay
> >>>> +etc/rc.d/init.d/dnsntp
> >>>> etc/rc.d/init.d/fcron
> >>>> etc/rc.d/init.d/fireinfo
> >>>> etc/rc.d/init.d/firewall
> >>>> diff --git a/html/cgi-bin/optionsfw.cgi b/html/cgi-bin/optionsfw.cgi
> >>>> index 321642e82..3fc707e8b 100644
> >>>> --- a/html/cgi-bin/optionsfw.cgi
> >>>> +++ b/html/cgi-bin/optionsfw.cgi
> >>>> @@ -2,7 +2,7 @@
> >>>> ###############################################################################
> >>>> #                                                                             #
> >>>> # IPFire.org - A linux based firewall                                         #
> >>>> -# Copyright (C) 2014-2020  IPFire Team  <info(a)ipfire.org>                     #
> >>>> +# Copyright (C) 2014-2021  IPFire Team  <info(a)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        #
> >>>> @@ -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> </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>$Lang::tr{'fw blue'}</b></td></tr>
> >>>> +		<tr> </tr>
> >>>> +			<tr>
> >>>> +			<tr><td align='left' width='60%'>$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 6a8133807..d6bb234fa 100644
> >>>> --- a/langs/de/cgi-bin/de.pl
> >>>> +++ b/langs/de/cgi-bin/de.pl
> >>>> @@ -836,6 +836,8 @@
> >>>> '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 <a href=\'/cgi-bin/dns.cgi\'>lokale DNS-Server</a> auf BLAU',
> >>>> +'dns force on green' => 'Erzwinge <a href=\'/cgi-bin/dns.cgi\'>lokale DNS-Server</a> auf GRÜN',
> >>>> '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',
> >>>> @@ -1102,9 +1104,12 @@
> >>>> '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',
> >>>> @@ -1644,9 +1649,9 @@
> >>>> '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',
> >>>> @@ -1814,6 +1819,8 @@
> >>>> 'november' => 'November',
> >>>> 'ntp common settings' => 'Allgemeine Einstellungen',
> >>>> 'ntp configuration' => 'Zeitserverkonfiguration',
> >>>> +'ntp force on blue' => 'Erzwinge <a href=\'/cgi-bin/time.cgi\'>lokale NTP-Server</a> auf BLAU',
> >>>> +'ntp force on green' => 'Erzwinge <a href=\'/cgi-bin/time.cgi\'>lokale NTP-Server</a> auf GRÜN',
> >>>> '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 8f7e0c2cf..474612025 100644
> >>>> --- a/langs/en/cgi-bin/en.pl
> >>>> +++ b/langs/en/cgi-bin/en.pl
> >>>> @@ -859,6 +859,8 @@
> >>>> '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 <a href=\'/cgi-bin/dns.cgi\'>local DNS servers</a> on BLUE',
> >>>> +'dns force on green' => 'Force DNS to use <a href=\'/cgi-bin/dns.cgi\'>local DNS servers</a> on GREEN',
> >>>> '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',
> >>>> @@ -1672,9 +1677,9 @@
> >>>> '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',
> >>>> @@ -1844,6 +1849,8 @@
> >>>> 'november' => 'November',
> >>>> 'ntp common settings' => 'Common settings',
> >>>> 'ntp configuration' => 'NTP Configuration',
> >>>> +'ntp force on blue' => 'Force NTP to use <a href=\'/cgi-bin/time.cgi\'>local NTP servers</a> on BLUE',
> >>>> +'ntp force on green' => 'Force NTP to use <a href=\'/cgi-bin/time.cgi\'>local NTP servers</a> on GREEN',
> >>>> '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 a3e474d70..622793b35 100644
> >>>> --- a/lfs/configroot
> >>>> +++ b/lfs/configroot
> >>>> @@ -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..2eafa9d20
> >>>> --- /dev/null
> >>>> +++ b/src/initscripts/system/dnsntp
> >>>> @@ -0,0 +1,36 @@
> >>>> +#!/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 $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
> >>>> +
> >>>> +# Force DNS REDIRECTs on GREEN (udp, tcp, 53)
> >>>> +if [ "$DNS_FORCE_ON_GREEN" == "on" ]; then
> >>>> +	iptables -t nat -A DNS_NTP_REDIRECT -i green0 -p udp -m udp --dport 53 -j REDIRECT
> >>>> +	iptables -t nat -A DNS_NTP_REDIRECT -i green0 -p tcp -m tcp --dport 53 -j REDIRECT
> >>>> +fi
> >>>> +
> >>>> +# Force DNS REDIRECTs on BLUE (udp, tcp, 53)
> >>>> +if [ "$DNS_FORCE_ON_BLUE" == "on" ]; then
> >>>> +	iptables -t nat -A DNS_NTP_REDIRECT -i blue0 -p udp -m udp --dport 53 -j REDIRECT
> >>>> +	iptables -t nat -A DNS_NTP_REDIRECT -i blue0 -p tcp -m tcp --dport 53 -j REDIRECT
> >>>> +fi
> >>>> +
> >>>> +# Force NTP REDIRECTs on GREEN (udp, 123)
> >>>> +if [ "$NTP_FORCE_ON_GREEN" == "on" ]; then
> >>>> +	iptables -t nat -A DNS_NTP_REDIRECT -i green0 -p udp -m udp --dport 123 -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 blue0 -p udp -m udp --dport 123 -j REDIRECT
> >>>> +fi
> >>>> +
> >>>> +# End $rc_base/init.d/dnsntp
> >>>> diff --git a/src/initscripts/system/firewall b/src/initscripts/system/firewall
> >>>> index 65f1c979b..43ae74113 100644
> >>>> --- a/src/initscripts/system/firewall
> >>>> +++ b/src/initscripts/system/firewall
> >>>> @@ -169,6 +169,10 @@ iptables_init() {
> >>>> 	# Fix for braindead ISPs
> >>>> 	iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
> >>>> 
> >>>> +	# DNS / NTP REDIRECT
> >>>> +	iptables -t nat -N DNS_NTP_REDIRECT
> >>>> +	iptables -t nat -A PREROUTING -j DNS_NTP_REDIRECT
> >>>> +
> >>>> 	# CUSTOM chains, can be used by the users themselves
> >>>> 	iptables -N CUSTOMINPUT
> >>>> 	iptables -A INPUT -j CUSTOMINPUT
> >>>> @@ -281,7 +285,7 @@ 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
> >>>> @@ -389,6 +393,9 @@ 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..6f2733ef0 100644
> >>>> --- a/src/misc-progs/Makefile
> >>>> +++ b/src/misc-progs/Makefile
> >>>> @@ -26,7 +26,7 @@ PROGS = iowrap
> >>>> SUID_PROGS = squidctrl sshctrl ipfirereboot \
> >>>> 	ipsecctrl timectrl dhcpctrl suricatactrl \
> >>>> 	rebuildhosts backupctrl collectdctrl \
> >>>> -	logwatch wioscan wiohelper openvpnctrl firewallctrl \
> >>>> +	logwatch wioscan wiohelper openvpnctrl firewallctrl dnsntpctrl \
> >>>> 	wirelessctrl getipstat qosctrl \
> >>>> 	redctrl syslogdctrl extrahdctrl sambactrl \
> >>>> 	smartctrl clamavctrl addonctrl pakfire mpfirectrl wlanapctrl \
> >>>> 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;
> >>>> +}
> >>>> -- 
> >>>> 2.18.0
> >>>> 
> >>>> 
> >>> 
> >> 
> >> 
> 
>