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firewall: Allow accessing port forwardings from internal networks.

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This commit is contained in:
Michael Tremer
2014-03-02 20:37:44 +01:00
parent 8f4f4634df
commit 6e87f0aa53
2 changed files with 84 additions and 24 deletions
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73
config/firewall/rules.pl
View File

@@ -37,6 +37,7 @@ my $CHAIN_OUTPUT = "OUTPUTFW";
my $CHAIN = $CHAIN_FORWARD;
my $CHAIN_NAT_SOURCE = "NAT_SOURCE";
my $CHAIN_NAT_DESTINATION = "NAT_DESTINATION";
my $CHAIN_MANGLE_NAT_DESTINATION_FIX = "NAT_DESTINATION";
my @VALID_CHAINS = ($CHAIN_INPUT, $CHAIN_FORWARD, $CHAIN_OUTPUT);
my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip");
@@ -94,6 +95,10 @@ sub run {
print "$command\n";
} else {
system "$command";
if ($?) {
print_error("ERROR: $command");
}
}
}
@@ -121,6 +126,7 @@ sub flush {
run("$IPTABLES -F OUTGOINGFW");
run("$IPTABLES -t nat -F NAT_DESTINATION");
run("$IPTABLES -t nat -F NAT_SOURCE");
run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX");
}
sub preparerules {
@@ -258,17 +264,16 @@ sub buildrules {
push(@options, @protocol_options);
}
# Append source.
# Prepare source options.
my @source_options = ();
if ($source =~ /mac/) {
push(@options, $source);
push(@source_options, $source);
} else {
push(@options, ("-s", $source));
push(@source_options, ("-s", $source));
}
# Append destination for non-DNAT rules.
unless ($NAT && ($NAT_MODE eq "DNAT")) {
push(@options, ("-d", $destination));
}
# Prepare destination options.
my @destination_options = ("-d", $destination);
# Add time constraint options.
push(@options, @time_options);
@@ -283,11 +288,15 @@ sub buildrules {
# Destination NAT
if ($NAT_MODE eq "DNAT") {
my ($dnat_address, $dnat_mask) = split("/", $destination);
# Make port-forwardings useable from the internal networks.
&add_dnat_mangle_rules($nat_address, @options);
my @nat_options = @options;
push(@nat_options, @source_options);
push(@nat_options, ("-d", $nat_address));
push(@options, ("-d", $dnat_address));
my ($dnat_address, $dnat_mask) = split("/", $destination);
@destination_options = ("-d", $dnat_address);
if ($protocol_has_ports) {
my $dnat_port = &get_dnat_target_port($hash, $key);
@@ -296,20 +305,20 @@ sub buildrules {
$dnat_address .= ":$dnat_port";
# Replace --dport with the translated one.
my @new_options = ();
my @new_nat_options = ();
my $skip_count = 0;
foreach my $option (@options) {
foreach my $option (@nat_options) {
next if ($skip_count-- > 0);
if ($option eq "--dport") {
push(@new_options, ("--dport", $dnat_port));
push(@new_nat_options, ("--dport", $dnat_port));
$skip_count = 1;
next;
}
push(@new_options, $option);
push(@new_nat_options, $option);
}
@options = @new_options;
@nat_options = @new_nat_options;
}
}
@@ -320,13 +329,21 @@ sub buildrules {
# Source NAT
} elsif ($NAT_MODE eq "SNAT") {
my @nat_options = @options;
push(@nat_options, @source_options);
push(@nat_options, @destination_options);
if ($LOG) {
run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @options -j LOG --log-prefix 'SNAT'");
run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options -j LOG --log-prefix 'SNAT'");
}
run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @options -j SNAT --to-source $nat_address");
run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options -j SNAT --to-source $nat_address");
}
}
push(@options, @source_options);
push(@options, @destination_options);
# Insert firewall rule.
if ($LOG && !$NAT) {
run("$IPTABLES -A $chain @options -j LOG");
@@ -734,3 +751,27 @@ sub get_dnat_target_port {
return $$hash{$key}[15];
}
}
sub add_dnat_mangle_rules {
my $nat_address = shift;
my @options = @_;
my $mark = 0;
foreach my $zone ("GREEN", "BLUE", "ORANGE") {
$mark++;
# Skip rule if not all required information exists.
next unless (exists $defaultNetworks{$zone . "_NETADDRESS"});
next unless (exists $defaultNetworks{$zone . "_NETMASK"});
my @mangle_options = @options;
my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"};
$netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"};
push(@mangle_options, ("-s", $netaddress, "-d", $nat_address));
push(@mangle_options, ("-j", "MARK", "--set-mark", $mark));
run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options");
}
}

35
src/initscripts/init.d/firewall
View File

@@ -189,14 +189,6 @@ iptables_init() {
iptables -t nat -N NAT_SOURCE
iptables -t nat -A POSTROUTING -j NAT_SOURCE
# RED chain, used for the red interface
iptables -N REDINPUT
iptables -A INPUT -j REDINPUT
iptables -N REDFORWARD
iptables -A FORWARD -j REDFORWARD
iptables -t nat -N REDNAT
iptables -t nat -A POSTROUTING -j REDNAT
# Custom prerouting chains (for transparent proxy)
iptables -t nat -N SQUID
iptables -t nat -A PREROUTING -j SQUID
@@ -205,12 +197,39 @@ iptables_init() {
iptables -t nat -N NAT_DESTINATION
iptables -t nat -A PREROUTING -j NAT_DESTINATION
iptables -t mangle -N NAT_DESTINATION
iptables -t mangle -A PREROUTING -j NAT_DESTINATION
iptables -t nat -N NAT_DESTINATION_FIX
iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
iptables -t nat -A NAT_DESTINATION_FIX \
-m mark --mark 1 -j SNAT --to-source "${GREEN_ADDRESS}"
if [ -n "${BLUE_ADDRESS}" ]; then
iptables -t nat -A NAT_DESTINATION_FIX \
-m mark --mark 2 -j SNAT --to-source "${BLUE_ADDRESS}"
fi
if [ -n "${ORANGE_ADDRESS}" ]; then
iptables -t nat -A NAT_DESTINATION_FIX \
-m mark --mark 3 -j SNAT --to-source "${ORANGE_ADDRESS}"
fi
# upnp chain for our upnp daemon
iptables -t nat -N UPNPFW
iptables -t nat -A PREROUTING -j UPNPFW
iptables -N UPNPFW
iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
# RED chain, used for the red interface
iptables -N REDINPUT
iptables -A INPUT -j REDINPUT
iptables -N REDFORWARD
iptables -A FORWARD -j REDFORWARD
iptables -t nat -N REDNAT
iptables -t nat -A POSTROUTING -j REDNAT
# Apply OpenVPN firewall rules
/usr/local/bin/openvpnctrl --firewall-rules