X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=PVE%2FFirewall.pm;h=fde72fdf99e800b9fd0f833e8cca9a50d20d58a8;hb=e3a1d391206d419fadf1f78896dd1dc7f6c9b0b4;hp=ef9d136d43058d83b912995bb65b4ea080a77daa;hpb=25c7b224a92c7eb81cabcdad67ec99b7fa124660;p=pve-firewall.git

diff --git a/PVE/Firewall.pm b/PVE/Firewall.pm
index ef9d136..fde72fd 100644
--- a/PVE/Firewall.pm
+++ b/PVE/Firewall.pm
@@ -224,7 +224,7 @@ my $pve_fw_macros = {
 	{ action => 'PARAM', proto => 'tcp', dport => '1723' },
     ],
     'Ping' => [
-	{ action => 'PARAM', proto => 'icmp', dport => '8' },
+	{ action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
     ],
     'PostgreSQL' => [
 	{ action => 'PARAM', proto => 'tcp', dport => '5432' },
@@ -322,7 +322,7 @@ my $pve_fw_macros = {
     ],
     'Trcrt' => [
 	{ action => 'PARAM', proto => 'udp', dport => '33434:33524' },
-	{ action => 'PARAM', proto => 'icmp', dport => '8' },
+	{ action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
     ],
     'VNC' => [
 	{ action => 'PARAM', proto => 'tcp', dport => '5900:5909' },
@@ -417,6 +417,32 @@ my $pve_std_chains = {
 	# Drop DNS replies
 	{ action => 'DROP', proto => 'udp', sport => 53 },
     ],
+    'PVEFW-logflags' => [
+	# same as shorewall logflags action. (fixme: enable/disable logging)
+	"-j LOG --log-prefix \"logflags-dropped:\" --log-level 4 --log-ip-options",
+	"-j DROP",
+    ],
+    'PVEFW-tcpflags' => [
+	# same as shorewall tcpflags action.
+	# Packets arriving on this interface are checked for som illegal combinations of TCP flags
+	"-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
+	"-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
+	"-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
+	"-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
+	"-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
+    ],
+    'PVEFW-smurflog' => [
+	# same as shorewall smurflog. (fixme: enable/disable logging)
+	"-j LOG --log-prefix \"smurfs-dropped\" --log-level 4",
+	"-j DROP",
+    ],
+    'PVEFW-smurfs' => [
+	# same as shorewall smurfs action
+	# Filter packets for smurfs (packets with a broadcast address as the source).
+	"-s 0.0.0.0/32 -j RETURN",
+	"-m addrtype --src-type BROADCAST -g PVEFW-smurflog",
+	"-s 224.0.0.0/4 -g PVEFW-smurflog",
+    ],
 };
 
 # iptables -p icmp -h
@@ -686,7 +712,9 @@ sub iptables_rule_exist {
 }
 
 sub ruleset_generate_rule {
-    my ($ruleset, $chain, $rule, $goto) = @_;
+    my ($ruleset, $chain, $rule, $actions, $goto) = @_;
+
+    return if $rule->{disable};
 
     my $cmd = '';
 
@@ -696,19 +724,27 @@ sub ruleset_generate_rule {
     $cmd .= " -d $rule->{dest}" if $rule->{dest};
     $cmd .= " -p $rule->{proto}" if $rule->{proto};
 
-    if (($rule->{nbdport} && $rule->{nbdport} > 1) ||
-	($rule->{nbsport} && $rule->{nbsport} > 1)) {
-	$cmd .= " --match multiport" 
-    }
+    my $multiport = 0;
+    $multiport++ if $rule->{nbdport} && ($rule->{nbdport} > 1);
+    $multiport++ if $rule->{nbsport} && ($rule->{nbsport} > 1);
+
+    $cmd .= " --match multiport" if $multiport;
+
+    die "multiport: option '--sports' cannot be used together with '--dports'\n" 
+	if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
 
     if ($rule->{dport}) {
 	if ($rule->{proto} && $rule->{proto} eq 'icmp') {
 	    # Note: we use dport to store --icmp-type
-	    die "unknown icmp-type\n" if !$icmp_type_names->{$rule->{dport}};
+	    die "unknown icmp-type '$rule->{dport}'\n" if !$icmp_type_names->{$rule->{dport}};
 	    $cmd .= " -m icmp --icmp-type $rule->{dport}";
 	} else {
 	    if ($rule->{nbdport} && $rule->{nbdport} > 1) {
-		$cmd .= " --dports $rule->{dport}";
+		if ($multiport == 2) {
+		    $cmd .= " --ports $rule->{dport}";
+		} else {
+		    $cmd .= " --dports $rule->{dport}";
+		}
 	    } else {
 		$cmd .= " --dport $rule->{dport}";
 	    }
@@ -717,7 +753,7 @@ sub ruleset_generate_rule {
 
     if ($rule->{sport}) {
 	if ($rule->{nbsport} && $rule->{nbsport} > 1) {
-	    $cmd .= " --sports $rule->{sport}";
+	    $cmd .= " --sports $rule->{sport}" if $multiport != 2;
 	} else {
 	    $cmd .= " --sport $rule->{sport}";
 	}
@@ -726,6 +762,7 @@ sub ruleset_generate_rule {
     $cmd .= " -m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
 
     if (my $action = $rule->{action}) {
+	$action = $actions->{$action} if defined($actions->{$action}); 
 	$goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
 	$cmd .= $goto ? " -g $action" : " -j $action";
     };
@@ -790,6 +827,8 @@ sub generate_bridge_chains {
 	ruleset_create_chain($ruleset, "$bridge-IN");
 	ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-out -j $bridge-IN");
 	ruleset_addrule($ruleset, "$bridge-FW", "-m mark --mark 1 -j ACCEPT");
+	# accept traffic to unmanaged bridge ports
+	ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-out -j ACCEPT ");
     }
 }
 
@@ -803,10 +842,23 @@ sub generate_tap_rules_direction {
 
     ruleset_create_chain($ruleset, $tapchain);
 
+    if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
+	ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
+    }
+
+    if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
+	ruleset_addrule($ruleset, $tapchain, "-p udp -m udp --dport 67:68 -j ACCEPT");
+    }
+
+    if ($options->{tcpflags}) {
+	ruleset_addrule($ruleset, $tapchain, "-p tcp -j PVEFW-tcpflags");
+    }
+
     ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate INVALID -j DROP");
     ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 
-    if ($direction eq 'OUT' && defined($macaddr)) {
+    if ($direction eq 'OUT' && defined($macaddr) && 
+	!(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
 	ruleset_addrule($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP");
     }
 
@@ -824,8 +876,12 @@ sub generate_tap_rules_direction {
 		ruleset_addrule($ruleset, $tapchain, "-m mark --mark 1 -j RETURN")
 		    if $direction eq 'OUT';
 	    } else {
-		$rule->{action} = "PVEFW-SET-ACCEPT-MARK" if $rule->{action} eq 'ACCEPT' && $direction eq 'OUT';
-		ruleset_generate_rule($ruleset, $tapchain, $rule);
+		if ($direction eq 'OUT') {
+		    ruleset_generate_rule($ruleset, $tapchain, $rule, 
+					  { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
+		} else {
+		    ruleset_generate_rule($ruleset, $tapchain, $rule, { REJECT => "PVEFW-reject" });
+		}
 	    }
 	}
     }
@@ -889,8 +945,7 @@ sub enablehostfw {
     if ($rules->{in}) {
         foreach my $rule (@{$rules->{in}}) {
             # we use RETURN because we need to check also tap rules
-            $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
-            ruleset_generate_rule($ruleset, $chain, $rule);
+            ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => 'RETURN', REJECT => "PVEFW-reject" });
         }
     }
 
@@ -911,8 +966,7 @@ sub enablehostfw {
     if ($rules->{out}) {
         foreach my $rule (@{$rules->{out}}) {
             # we use RETURN because we need to check also tap rules
-            $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
-            ruleset_generate_rule($ruleset, $chain, $rule);
+            ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => 'RETURN', REJECT => "PVEFW-reject" });
         }
     }
 
@@ -936,7 +990,7 @@ sub generate_group_rules {
 
     if ($rules->{in}) {
         foreach my $rule (@{$rules->{in}}) {
- 	    ruleset_generate_rule($ruleset, $chain, $rule);
+ 	    ruleset_generate_rule($ruleset, $chain, $rule, { REJECT => "PVEFW-reject" });
         }
     }
 
@@ -947,11 +1001,10 @@ sub generate_group_rules {
 
     if ($rules->{out}) {
         foreach my $rule (@{$rules->{out}}) {
-            # we go the PVEFW-SET-ACCEPT-MARK Instead of ACCEPT) because we need to
-	    # check also other tap rules (and group rules can be set on any bridge,
-	    # so we can't go to VMBRXX-IN)
-            $rule->{action} = 'PVEFW-SET-ACCEPT-MARK' if $rule->{action} eq 'ACCEPT';
-            ruleset_generate_rule($ruleset, $chain, $rule);
+            # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
+	    # check also other tap rules later
+            ruleset_generate_rule($ruleset, $chain, $rule, 
+				  { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
         }
     }
 }
@@ -970,7 +1023,11 @@ sub parse_fw_rule {
 
     my ($action, $iface, $source, $dest, $proto, $dport, $sport);
 
-    $line =~ s/#.*$//;
+    # we can add single line comments to the end of the rule
+    my $comment = $1 if $line =~ s/#\s*(.*?)\s*$//;
+
+    # we can disable a rule when prefixed with '|'
+    my $disable = 1 if  $line =~ s/^\|//;
 
     my @data = split(/\s+/, $line);
     my $expected_elements = $need_iface ? 7 : 6;
@@ -1029,6 +1086,8 @@ sub parse_fw_rule {
     my $rules = [];
 
     my $param = {
+	disable => $disable,
+	comment => $comment,
 	action => $action,
 	iface => $iface,
 	source => $source,
@@ -1043,19 +1102,33 @@ sub parse_fw_rule {
     if ($macro) {
 	foreach my $templ (@$macro) {
 	    my $rule = {};
+	    my $param_used = {};
 	    foreach my $k (keys %$templ) {
 		my $v = $templ->{$k};
 		if ($v eq 'PARAM') {
 		    $v = $param->{$k};
+		    $param_used->{$k} = 1;
 		} elsif ($v eq 'DEST') {
 		    $v = $param->{dest};
+		    $param_used->{dest} = 1;
 		} elsif ($v eq 'SOURCE') {
 		    $v = $param->{source};
+		    $param_used->{source} = 1;
 		}
 
 		die "missing parameter '$k' in macro '$macro_name'\n" if !defined($v);
 		$rule->{$k} = $v;
 	    }
+	    foreach my $k (keys %$param) {
+		next if !defined($param->{$k});
+		next if $param_used->{$k};
+		if (defined($rule->{$k})) {
+		    die "parameter '$k' already define in macro (value = '$rule->{$k}')\n"
+			if $rule->{$k} ne $param->{$k};
+		} else {
+		    $rule->{$k} = $param->{$k};
+		}
+	    }
 	    push @$rules, $rule;
 	}
     } else {
@@ -1077,13 +1150,13 @@ sub parse_fw_option {
 
     my ($opt, $value);
 
-    if ($line =~ m/^enable:\s*(0|1)\s*$/i) {
-	$opt = 'enable';
-	$value = int($1);
+    if ($line =~ m/^(enable|dhcp|macfilter|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
+	$opt = lc($1);
+	$value = int($2);
     } elsif ($line =~ m/^(policy-(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
 	$opt = lc($1);
 	$value = uc($3);
-     } else {
+    } else {
 	chomp $line;
 	die "can't parse option '$line'\n"
     }