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#!/usr/bin/perl
# setup.cgi
# Setup an initial save file
require './ipfilter-lib.pl';
&ReadParse();
@rules = ( );
if ($in{'auto'}) {
$iface = $in{'iface'.$in{'auto'}};
if ($iface eq 'other') {
$iface = $in{'iface'.$in{'auto'}.'_other'};
}
$iface || &error($text{'setup_eiface'});
if ($in{'auto'} >= 2) {
# Block all incoming traffic, except for established
# connections, DNS replies and safe ICMP types
# In mode 3 allow ssh and ident too
# In mode 4 allow ftp, echo-request and high ports too
push(@rules,
{ 'action' => 'skip', 'skip' => 1, 'active' => 1,
'quick' => 1, 'dir' => 'in',
'all' => 1,
'on' => $iface,
'cmt' => 'Skip next rule for external interface' },
{ 'action' => 'pass', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'all' => 1,
'keep' => 'state',
'cmt' => 'Allow all traffic on internal interface' },
{ 'action' => 'pass', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'udp',
'from-any' => 1,
'to-any' => 1,
'to-port-start' => 1024,
'to-port-range' => '<>',
'to-port-end' => 1024,
'keep' => 'state',
'cmt' => 'Accept responses to DNS queries' },
{ 'action' => 'pass', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'icmp',
'all' => 1,
'icmp-type' => 'echorep',
'keep' => 'state',
'cmt' => 'Accept responses to our pings' },
{ 'action' => 'pass', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'icmp',
'all' => 1,
'icmp-type' => 'unreach',
'keep' => 'state',
'cmt' => 'Accept notifications of unreachable hosts' },
{ 'action' => 'pass', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'icmp',
'all' => 1,
'icmp-type' => 'squench',
'keep' => 'state',
'cmt' => 'Accept notifications to reduce sending speed' },
{ 'action' => 'pass', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'icmp',
'all' => 1,
'icmp-type' => 'timex',
'keep' => 'state',
'cmt' => 'Accept notifications of lost packets' },
{ 'action' => 'pass', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'icmp',
'all' => 1,
'icmp-type' => 'paramprob',
'keep' => 'state',
'cmt' => 'Accept notifications of protocol problems' }
);
if ($in{'auto'} >= 3) {
# Allow ssh and ident
push(@rules,
{ 'action' => 'pass', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'tcp',
'from-any' => 1,
'to-any' => 1,
'to-port-comp' => '=',
'to-port-num' => 22,
'keep' => 'state',
'cmt' => 'Allow connections to our SSH server' },
{ 'action' => 'pass', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'tcp',
'from-any' => 1,
'to-any' => 1,
'to-port-comp' => '=',
'to-port-num' => 113,
'keep' => 'state',
'cmt' => 'Allow connections to our IDENT server' },
);
}
if ($in{'auto'} == 4) {
# Allow pings and most high ports
push(@rules,
{ 'action' => 'pass', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'icmp',
'all' => 1,
'icmp-type' => 'echo',
'keep' => 'state',
'cmt' => 'Respond to pings' },
{ 'action' => 'block', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'tcp',
'from-any' => 1,
'to-any' => 1,
'to-port-start' => 2049,
'to-port-range' => '<>',
'to-port-end' => 2050,
'keep' => 'state',
'cmt' => 'Protect our NFS server' },
{ 'action' => 'block', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'tcp',
'from-any' => 1,
'to-any' => 1,
'to-port-start' => 6000,
'to-port-range' => '<>',
'to-port-end' => 6063,
'keep' => 'state',
'cmt' => 'Protect our X11 display server' },
{ 'action' => 'block', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'tcp',
'from-any' => 1,
'to-any' => 1,
'to-port-start' => 7000,
'to-port-range' => '<>',
'to-port-end' => 7010,
'keep' => 'state',
'cmt' => 'Protect our X font server' },
{ 'action' => 'pass', 'active' => 1,
'quick' => 1, 'dir' => 'in',
'proto' => 'tcp',
'from-any' => 1,
'to-any' => 1,
'to-port-start' => 1024,
'to-port-range' => '<>',
'to-port-end' => 65535,
'keep' => 'state',
'cmt' => 'Allow connections to unprivileged ports' },
);
}
# Add final block rule
push(@rules, { 'action' => 'block', 'active' => 1,
'all' => 1,
'dir' => 'in' });
push(@rules, { 'action' => 'pass', 'active' => 1,
'all' => 1,
'dir' => 'out' });
}
else {
# Just add one rule for NAT
push(@natrules, { 'action' => 'map', 'active' => 1,
'fromip' => '0.0.0.0', 'frommask' => 0,
'toip' => '0.0.0.0', 'tomask' => 32,
'iface' => $iface,
'type' => 'ipnat' });
# Allow all other traffic
push(@rules, { 'action' => 'pass', 'active' => 1,
'all' => 1,
'dir' => 'in' });
push(@rules, { 'action' => 'pass', 'active' => 1,
'all' => 1,
'dir' => 'out' });
}
}
else {
# Just add rules to allow all
push(@rules, { 'action' => 'pass', 'active' => 1,
'all' => 1,
'dir' => 'in' });
push(@rules, { 'action' => 'pass', 'active' => 1,
'all' => 1,
'dir' => 'out' });
}
&lock_file($config{'ipf_conf'});
&save_config(\@rules);
&unlock_file($config{'ipf_conf'});
&lock_file($config{'ipnatf_conf'});
&save_config(\@natrules, undef, 'ipnat');
&unlock_file($config{'ipnatf_conf'});
©_to_cluster();
if ($in{'atboot'}) {
&create_firewall_init();
}
&webmin_log("setup");
&redirect("");
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