my $CHAIN_NAT_DESTINATION = "NAT_DESTINATION";
my $CHAIN_MANGLE_NAT_DESTINATION_FIX = "NAT_DESTINATION";
my @VALID_CHAINS = ($CHAIN_INPUT, $CHAIN_FORWARD, $CHAIN_OUTPUT);
+my @ANY_ADDRESSES = ("0.0.0.0/0.0.0.0", "0.0.0.0/0", "0/0");
my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip");
my @PROTOCOLS_WITH_PORTS = ("tcp", "udp");
}
# Collect all sources.
- my @sources = &get_addresses($hash, $key, "src");
+ my @sources = &fwlib::get_addresses($hash, $key, "src");
# Collect all destinations.
- my @destinations = &get_addresses($hash, $key, "tgt");
+ my @destinations = &fwlib::get_addresses($hash, $key, "tgt");
+
+ # True if the destination is the firewall itself.
+ my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire");
# Check if logging should be enabled.
my $LOG = ($$hash{$key}[17] eq 'ON');
}
# Prepare protocol options (like ICMP types, ports, etc...).
- my @protocol_options = &get_protocol_options($hash, $key, $protocol);
+ my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0);
# Check if this protocol knows ports.
my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS);
# Skip invalid rules.
next if (!$source || !$destination || ($destination eq "none"));
+ # Sanitize source.
+ if ($source ~~ @ANY_ADDRESSES) {
+ $source = "";
+ }
+
+ # Sanitize destination.
+ if ($destination ~~ @ANY_ADDRESSES) {
+ $destination = "";
+ }
+
# Array with iptables arguments.
my @options = ();
# Append protocol.
if ($protocol ne "all") {
- push(@options, ("-p", $protocol));
push(@options, @protocol_options);
}
my @source_options = ();
if ($source =~ /mac/) {
push(@source_options, $source);
- } else {
+ } elsif ($source) {
push(@source_options, ("-s", $source));
}
# Prepare destination options.
- my @destination_options = ("-d", $destination);
+ my @destination_options = ();
+ if ($destination) {
+ push(@destination_options, ("-d", $destination));
+ }
# Add time constraint options.
push(@options, @time_options);
+ my $firewall_is_in_source_subnet = 0;
+ if ($source) {
+ $firewall_is_in_source_subnet = &firewall_is_in_subnet($source);
+ }
+
# Process NAT rules.
if ($NAT) {
- my $nat_address = &get_nat_address($$hash{$key}[29]);
+ my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source);
# Skip NAT rules if the NAT address is unknown
# (i.e. no internet connection has been established, yet).
# Destination NAT
if ($NAT_MODE eq "DNAT") {
# Make port-forwardings useable from the internal networks.
- &add_dnat_mangle_rules($nat_address, @options);
+ my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1);
+ unless ($nat_address ~~ @internal_addresses) {
+ &add_dnat_mangle_rules($nat_address, @options);
+ }
- my @nat_options = @options;
+ my @nat_options = ();
+ if ($protocol ne "all") {
+ my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1);
+ push(@nat_options, @nat_protocol_options);
+ }
push(@nat_options, @source_options);
push(@nat_options, ("-d", $nat_address));
+ push(@nat_options, @time_options);
- my ($dnat_address, $dnat_mask) = split("/", $destination);
- @destination_options = ("-d", $dnat_address);
-
+ my $dnat_port;
if ($protocol_has_ports) {
- my $dnat_port = &get_dnat_target_port($hash, $key);
+ $dnat_port = &get_dnat_target_port($hash, $key);
+ }
- if ($dnat_port) {
- $dnat_address .= ":$dnat_port";
+ my @nat_action_options = ();
+
+ # Use iptables REDIRECT
+ my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports && $dnat_port);
+ if ($use_redirect) {
+ push(@nat_action_options, ("-j", "REDIRECT", "--to-ports", $dnat_port));
+
+ # Use iptables DNAT
+ } else {
+ if ($destination_is_firewall && !$destination) {
+ $destination = &fwlib::get_external_address();
}
+ next unless ($destination);
+
+ my ($dnat_address, $dnat_mask) = split("/", $destination);
+ @destination_options = ("-d", $dnat_address);
+
+ if ($protocol_has_ports) {
+ my $dnat_port = &get_dnat_target_port($hash, $key);
+
+ if ($dnat_port) {
+ $dnat_address .= ":$dnat_port";
+ }
+ }
+
+ push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address));
}
if ($LOG) {
run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '");
}
- run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options -j DNAT --to-destination $dnat_address");
+ run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options");
# Source NAT
} elsif ($NAT_MODE eq "SNAT") {
}
push(@options, @source_options);
+
+ if ($firewall_is_in_source_subnet && ($fwdfwsettings{"POLICY"} eq "MODE1") && ($chain eq $CHAIN_FORWARD)) {
+ if ($LOG && !$NAT) {
+ run("$IPTABLES -A $CHAIN_INPUT @options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '");
+ }
+ run("$IPTABLES -A $CHAIN_INPUT @options -j $target");
+ }
+
push(@options, @destination_options);
# Insert firewall rule.
}
}
-sub get_external_interface() {
- open(IFACE, "/var/ipfire/red/iface") or return "";
- my $iface = <IFACE>;
- close(IFACE);
-
- return $iface;
-}
-
-sub get_external_address() {
- open(ADDR, "/var/ipfire/red/local-ipaddress") or return "";
- my $address = <ADDR>;
- close(ADDR);
-
- return $address;
-}
-
-sub get_alias {
- my $id = shift;
-
- foreach my $alias (sort keys %aliases) {
- if ($id eq $alias) {
- return $aliases{$alias};
- }
- }
-}
-
-sub get_nat_address {
- my $zone = shift;
-
- # Any static address of any zone.
- if ($zone eq "RED" || $zone eq "GREEN" || $zone eq "ORANGE" || $zone eq "BLUE") {
- return $defaultNetworks{$zone . "_ADDRESS"};
-
- } elsif ($zone eq "Default IP") {
- return &get_external_address();
-
- } else {
- return &get_alias($zone);
- }
-
- print_error("Could not find NAT address");
-}
-
# Formats the given timestamp into the iptables format which is "hh:mm" UTC.
sub format_time {
my $val = shift;
}
}
-sub get_addresses {
- my $hash = shift;
- my $key = shift;
- my $type = shift;
-
- my @addresses = ();
- my $addr_type;
- my $value;
- my $group_name;
-
- if ($type eq "src") {
- $addr_type = $$hash{$key}[3];
- $value = $$hash{$key}[4];
-
- } elsif ($type eq "tgt") {
- $addr_type = $$hash{$key}[5];
- $value = $$hash{$key}[6];
- }
-
- if ($addr_type ~~ ["cust_grp_src", "cust_grp_tgt"]) {
- foreach my $grp (sort {$a <=> $b} keys %customgrp) {
- if ($customgrp{$grp}[0] eq $value) {
- my @address = &get_address($customgrp{$grp}[3], $customgrp{$grp}[2], $type);
-
- if (@address) {
- push(@addresses, @address);
- }
- }
- }
- } else {
- my @address = &get_address($addr_type, $value, $type);
-
- if (@address) {
- push(@addresses, @address);
- }
- }
-
- return @addresses;
-}
-
-sub get_address {
- my $key = shift;
- my $value = shift;
- my $type = shift;
-
- my @ret = ();
-
- # If the user manually typed an address, we just check if it is a MAC
- # address. Otherwise, we assume that it is an IP address.
- if ($key ~~ ["src_addr", "tgt_addr"]) {
- if (&General::validmac($value)) {
- push(@ret, "-m mac --mac-source $value");
- } else {
- push(@ret, $value);
- }
-
- # If a default network interface (GREEN, BLUE, etc.) is selected, we
- # try to get the corresponding address of the network.
- } elsif ($key ~~ ["std_net_src", "std_net_tgt", "Standard Network"]) {
- my $external_interface = &get_external_interface();
-
- my $network_address = &fwlib::get_std_net_ip($value, $external_interface);
- if ($network_address) {
- push(@ret, $network_address);
- }
-
- # Custom networks.
- } elsif ($key ~~ ["cust_net_src", "cust_net_tgt", "Custom Network"]) {
- my $network_address = &fwlib::get_net_ip($value);
- if ($network_address) {
- push(@ret, $network_address);
- }
-
- # Custom hosts.
- } elsif ($key ~~ ["cust_host_src", "cust_host_tgt", "Custom Host"]) {
- my $host_address = &fwlib::get_host_ip($value, $type);
- if ($host_address) {
- push(@ret, $host_address);
- }
-
- # OpenVPN networks.
- } elsif ($key ~~ ["ovpn_net_src", "ovpn_net_tgt", "OpenVPN static network"]) {
- my $network_address = &fwlib::get_ovpn_net_ip($value, 1);
- if ($network_address) {
- push(@ret, $network_address);
- }
-
- # OpenVPN hosts.
- } elsif ($key ~~ ["ovpn_host_src", "ovpn_host_tgt", "OpenVPN static host"]) {
- my $host_address = &fwlib::get_ovpn_host_ip($value, 33);
- if ($host_address) {
- push(@ret, $host_address);
- }
-
- # OpenVPN N2N.
- } elsif ($key ~~ ["ovpn_n2n_src", "ovpn_n2n_tgt", "OpenVPN N-2-N"]) {
- my $network_address = &fwlib::get_ovpn_n2n_ip($value, 11);
- if ($network_address) {
- push(@ret, $network_address);
- }
-
- # IPsec networks.
- } elsif ($key ~~ ["ipsec_net_src", "ipsec_net_tgt", "IpSec Network"]) {
- my $network_address = &fwlib::get_ipsec_net_ip($value, 11);
- if ($network_address) {
- push(@ret, $network_address);
- }
-
- # The firewall's own IP addresses.
- } elsif ($key ~~ ["ipfire", "ipfire_src"]) {
- # ALL
- if ($value eq "ALL") {
- push(@ret, "0/0");
-
- # GREEN
- } elsif ($value eq "GREEN") {
- push(@ret, $defaultNetworks{"GREEN_ADDRESS"});
-
- # BLUE
- } elsif ($value eq "BLUE") {
- push(@ret, $defaultNetworks{"BLUE_ADDRESS"});
-
- # ORANGE
- } elsif ($value eq "ORANGE") {
- push(@ret, $defaultNetworks{"ORANGE_ADDRESS"});
-
- # RED
- } elsif ($value ~~ ["RED", "RED1"]) {
- my $address = &get_external_address();
- if ($address) {
- push(@ret, $address);
- }
-
- # Aliases
- } else {
- my %alias = &get_alias($value);
- if (%alias) {
- push(@ret, $alias{"IPT"});
- }
- }
-
- # If nothing was selected, we assume "any".
- } else {
- push(@ret, "0/0");
- }
-
- return @ret;
-}
-
sub get_protocols {
my $hash = shift;
my $key = shift;
my $hash = shift;
my $key = shift;
my $protocol = shift;
+ my $nat_options_wanted = shift;
my @options = ();
+ # Nothing to do if no protocol is specified.
+ if ($protocol eq "all") {
+ return @options;
+ } else {
+ push(@options, ("-p", $protocol));
+ }
+
# Process source ports.
my $use_src_ports = ($$hash{$key}[7] eq "ON");
my $src_ports = $$hash{$key}[10];
my $dst_ports = $$hash{$key}[15];
if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) {
- if ($use_dnat && $$hash{$key}[30]) {
+ if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) {
$dst_ports = $$hash{$key}[30];
}
push(@options, &format_ports($dst_ports, "dst"));
return @options;
}
+
+sub firewall_is_in_subnet {
+ my $subnet = shift;
+
+ # ORANGE is missing here, because nothing may ever access
+ # the firewall from this network.
+ my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0);
+
+ if ($address) {
+ return 1;
+ }
+
+ return 0;
+}
+
projects / people / teissler / ipfire-2.x.git / blobdiff