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Implement firewall

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- settings in iptables_rules.json
- creates a script under /tmp/iptables_raspap.sh and executes it
- no installer yet
- to do: deal with Bridge and VPN settings
This commit is contained in:
Christian Zeitnitz 2021-07-16 21:40:28 +02:00
parent 98533c3ee8
commit 59abc641d6
4 changed files with 413 additions and 0 deletions
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168
config/iptables_rules.json Normal file
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{
"info": "IPTABLES rules. $...$ expressions will be replaces automatically ($INTERFACE$, $PORT$, $IPADDRESS$)",
"rules_v4_file": "/etc/iptables/rules.v4",
"rules_v6_file": "/etc/iptables/rules.v6",
"order": [ "pre_rules", "restriction_rules", "main_rules", "exception_rules" ],
"pre_rules": [
{
"name": "firewall policies",
"fw-state": true,
"comment": "Policy rules (firewall)",
"rules": [
"-P INPUT DROP",
"-P FORWARD ACCEPT",
"-P OUTPUT ACCEPT",
"-t nat -P PREROUTING ACCEPT",
"-t nat -P POSTROUTING ACCEPT",
"-t nat -P INPUT ACCEPT",
"-t nat -P OUTPUT ACCEPT"
]
},
{
"name": "policies",
"fw-state": false,
"comment": "Policy rules",
"rules": [
"-P INPUT ACCEPT",
"-P FORWARD ACCEPT",
"-P OUTPUT ACCEPT",
"-t nat -P PREROUTING ACCEPT",
"-t nat -P POSTROUTING ACCEPT",
"-t nat -P INPUT ACCEPT",
"-t nat -P OUTPUT ACCEPT"
]
},
{
"name": "loopback",
"fw-state": true,
"comment": "allow loopback device",
"rules": [
"-A INPUT -i lo -j ACCEPT",
"-A OUTPUT -o lo -j ACCEPT"
]
},
{
"name": "ping",
"fw-state": true,
"comment": "allow ping request and echo",
"rules": [
"-A INPUT -p icmp --icmp-type 8/0 -j ACCEPT",
"-A INPUT -p icmp --icmp-type 0/0 -j ACCEPT"
]
},
{
"name": "ntp",
"fw-state": true,
"comment": "allow ntp request via udp (tcp should work w/o rule)",
"rules": [
"-A INPUT -p udp --sport 123 -j ACCEPT"
]
},
{
"name": "dns",
"fw-state": true,
"comment": "allow dns request via tcp and udp",
"rules": [
"-A INPUT -p udp -m multiport --sport 53,853 -j ACCEPT",
"-A INPUT -p tcp -m multiport --sport 53,853 -j ACCEPT"
]
}
],
"main_rules": [
{
"name": "accesspoint",
"fw-state": true,
"comment": "Access point interface by default no restrictions",
"dependson": [
{ "var": "ap-device", "type": "string", "replace": "$INTERFACE$" }
],
"rules": [
"-A INPUT -i $INTERFACE$ -j ACCEPT",
"-A OUTPUT -o $INTERFACE$ -j ACCEPT"
]
},
{
"name": "clients",
"fw-state": true,
"comment": "Rules for client interfaces (includes tun device)",
"rules": [
"-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT"
]
},
{
"name": "openvpn",
"comment": "Rules for tunnel device (tun)",
"dependson": [
{ "var": "openvpn-enable", "type": "bool" },
{ "var": "openvpn-serverip", "type": "string", "replace": "$IPADDRESS$" },
{ "var": "client-device", "type": "string", "replace": "$INTERFACE$" }
],
"rules": [
"-A FORWARD -i tun+ -o $INTERFACE$ -m state --state RELATED,ESTABLISHED -j ACCEPT",
"-A FORWARD -i $INTERFACE$ -o tun+ -j ACCEPT",
"-t nat -A POSTROUTING -o tun+ -j MASQUERADE"
]
}
],
"exception_rules": [
{
"name": "ssh",
"fw-state": true,
"comment": "Allow ssh access to RaspAP on port 22",
"dependson": [
{ "var": "ssh-enable", "type": "bool" }
],
"rules": [
"-A INPUT -p tcp --dport 22 -j ACCEPT"
]
},
{
"name": "http",
"fw-state": true,
"comment": "Allow access to RaspAP GUI (https)",
"dependson": [
{ "var": "http-enable", "type": "bool" }
],
"rules": [
"-A INPUT -p tcp -m multiport --dports 80,443 -j ACCEPT"
]
},
{
"name": "interface",
"fw-state": true,
"comment": "Exclude interface from firewall",
"dependson": [
{ "var": "excl-devices", "type": "list", "replace": "$INTERFACE$" }
],
"rules": [
"-A INPUT -i $INTERFACE$ -j ACCEPT",
"-A OUTPUT -o $INTERFACE$ -j ACCEPT"
]
},
{
"name": "ipaddress",
"fw-state": true,
"comment": "allow access from/to IP",
"dependson": [
{ "var": "excluded-ips", "type": "list", "replace": "$IPADDRESS$" }
],
"rules": [
"-A INPUT -s $IPADDRESS$ -j ACCEPT",
"-A INPUT -d $IPADDRESS$ -j ACCEPT"
]
}
],
"restriction_rules": [
{
"name": "ipaddress",
"fw-state": true,
"dependson": [
{ "var": "restricted-ips", "type": "list", "replace": "$IPADDRESS$" }
],
"comment": "Block access from IP-address",
"rules": [
"-A INPUT -s $IPADDRESS$ -j DROP"
]
}
]
}

174
includes/firewall.php Normal file
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<?php
require_once 'includes/status_messages.php';
require_once 'includes/functions.php';
define(RASPAP_FIREWALL_CONF,"/tmp/iptables.conf");
define(RASPAP_IPTABLES_CONF,"/etc/raspap/networking/firewall/iptables_rules.json");
define(RASPAP_IPTABLES_SCRIPT,"/tmp/iptables_raspap.sh");
function getDependson(&$rule, &$conf) {
if ( isset($rule["dependson"][0]) ) {
$don = &$rule["dependson"];
if ( !empty($don[0]) && isset($conf[$don[0]["var"]]) ) {
if ( !isset($don[0]["type"]) ) $don[0]["type"]="bool";
return $don;
}
}
return false;
}
function isRuleEnabled(&$sect, &$conf) {
$fw_on = isset($conf["firewall-enable"]) && $conf["firewall-enable"];
$active = isset($sect["fw-state"]) && $sect["fw-state"]==1;
$active = $fw_on ? $active : !$active;
$active = $active || !isset($sect["fw-state"]);
if ( ($don = getDependson($sect, $conf)) !== false &&
$don[0]["type"] == "bool" && !$conf[$don[0]["var"]] ) $active = false;
return $active;
}
function createRuleStr(&$sect, &$conf) {
if ( !is_array($sect["rules"]) ) return "";
$rules = $sect["rules"];
$depon = getDependson($sect,$conf);
$rs = array();
foreach ( $rules as $rule ) {
if ( preg_match('/\$[a-z0-9]*\$/i',$rule) ) {
$r = array($rule);
foreach ( $depon as $dep ) {
$rr = array();
$repl=$val="";
switch ( $dep["type"] ) {
case "list":
if ( isset($dep["var"]) && !empty($conf[$dep["var"]]) ) $val = explode(',', $conf[$dep["var"]]);
if ( !empty($val) && isset($dep["replace"]) ) $repl=$dep["replace"];
break;
case "string":
if ( isset($dep["var"]) ) $val=$conf[$dep["var"]];
if ( !empty($val) && isset($dep["replace"]) ) $repl=$dep["replace"];
break;
default:
break;
}
if ( !empty($repl) && !empty($val) ) {
//echo "replace $repl $val \n"; //print_r( $val); echo "\n";
if ( is_array($val) ) {
foreach ( $val as $v ) $rr = array_merge($rr,str_replace($repl, $v, $r));
}
else $rr = array_merge($rr, str_replace($repl, $val, $r));
}
$r = !empty($rr) ? $rr : $r;
}
$rs = array_merge($rs,$rr);
} else {
$rs[] = $rule;
}
}
$str="";
foreach ( $rs as $r ) {
if ( !preg_match('/\$[a-z0-9]*\$/i',$r) ) $str .= "iptables ".$r."\n";
}
return $str;
}
function setFirewall() {
$json = file_get_contents(RASPAP_IPTABLES_CONF);
$ipt = json_decode($json, true);
$conf = ReadFirewallConf();
//echo "<pre>";
// print_r($ipt);
$txt = "#!/bin/bash\n";
$txt .= "iptables -F\n";
$txt .= "iptables -X\n";
$txt .= "iptables -t nat -F\n";
file_put_contents(RASPAP_IPTABLES_SCRIPT, $txt);
if ( empty($conf) || empty($ipt) ) return false;
$count=0;
foreach ( $ipt["order"] as $idx ) {
if ( isset($ipt[$idx]) ) {
// echo "Handle $idx \n";
foreach ( $ipt[$idx] as $i => $sect ) {
if ( isRuleEnabled($sect, $conf) ) {
// echo " rule $i name ".$sect["name"]."\n";
$str_rules= createRuleStr($sect, $conf);
if ( !empty($str_rules) ) {
file_put_contents(RASPAP_IPTABLES_SCRIPT, $str_rules, FILE_APPEND);
++$count;
}
}
}
}
}
// echo "Firewall ON";
//echo "</pre>";
if ( $count > 0 ) {
exec("chmod +x ".RASPAP_IPTABLES_SCRIPT);
exec("sudo ".RASPAP_IPTABLES_SCRIPT);
// exec("sudo iptables-save > /etc/iptables/rules.v4");
// unlink(RASPAP_IPTABLES_SCRIPT);
}
return ($count > 0);
}
function WriteFirewallConf($conf) {
if ( is_array($conf) ) write_php_ini($conf,RASPAP_FIREWALL_CONF);
}
function ReadFirewallConf() {
if ( file_exists(RASPAP_FIREWALL_CONF) ) {
$conf = parse_ini_file(RASPAP_FIREWALL_CONF);
} else {
$conf = array();
$conf["firewall-enable"] = false;
$conf["openvpn-enable"] = false;
$conf["openvpn-serverip"] = "";
$conf["wireguard-enable"] = false;
$conf["wireguard-serverip"] = "";
$conf["ssh-enable"] = false;
$conf["http-enable"] = false;
$conf["excl-devices"] = "";
$conf["excluded-ips"] = "";
$conf["ap-device"] = "";
$conf["client-device"] = "";
$conf["restricted-ips"] = "";
}
return $conf;
}
function DisplayFirewallConfig()
{
$status = new StatusMessages();
$json = file_get_contents(RASPAP_IPTABLES_CONF);
$ipt_rules = json_decode($json, true);
getWifiInterface();
$ap_device = $_SESSION['ap_interface'];
$clients = getClients();
$fw_conf = ReadFirewallConf();
$fw_conf["ap-device"] = $ap_device;
$id=findCurrentClientIndex($clients);
if ( $id >= 0 ) $fw_conf["client-device"] = $clients["device"][$id]["name"];
if (!empty($_POST)) {
$fw_conf["ssh-enable"] = isset($_POST['ssh-enable']);
$fw_conf["http-enable"] = isset($_POST['http-enable']);
$fw_conf["firewall-enable"] = isset($_POST['firewall-enable']) || isset($_POST['apply-firewall']);
if ( isset($_POST['firewall-enable']) ) $status->addMessage(_('Firewall is now enabled'), 'success');
if ( isset($_POST['apply-firewall']) ) $status->addMessage(_('Firewall settings changed'), 'success');
if ( isset($_POST['firewall-disable']) ) $status->addMessage(_('Firewall is now disabled'), 'warning');
if ( isset($_POST['save-firewall']) ) $status->addMessage(_('Firewall settings saved. Firewall is still disabled.'), 'success');
WriteFirewallConf($fw_conf);
setFirewall();
}
echo renderTemplate("firewall", compact(
"status",
"ap_device",
"clients",
"fw_conf",
"ipt_rules")
);
}

1
installers/raspap.sudoers
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@ -62,3 +62,4 @@ www-data ALL=(ALL) NOPASSWD:/bin/cat /etc/wireguard/*.conf
www-data ALL=(ALL) NOPASSWD:/bin/cat /etc/wireguard/wg-*.key
www-data ALL=(ALL) NOPASSWD:/bin/rm /etc/wireguard/*.conf
www-data ALL=(ALL) NOPASSWD:/bin/rm /etc/wireguard/wg-*.key
www-data ALL=(ALL) NOPASSWD:/tmp/iptables_raspap.sh

70
templates/firewall.php Normal file
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<div class="row">
<div class="col-lg-12">
<div class="card">
<div class="card-header">
<div class="row">
<div class="col">
<i class="fas fa-shield-alt mr-2"></i><?php echo _("Firewall"); ?>
</div>
</div><!-- /.row -->
</div><!-- /.card-header -->
<div class="card-body">
<?php $status->showMessages(); ?>
<h4><?php echo _("Client Firewall"); ?></h4>
<?php if ( $fw_conf["firewall-enable"]) : ?>
<i class="fas fa-circle mr-2 service-status-up"></i><?php echo _("Firewall is ENABLED"); ?>
<?php else : ?>
<i class="fas fa-circle mr-2 service-status-down"></i><?php echo _("Firewall is OFF "); ?>
<?php endif ?>
<div class="row">
<div class="col-md-6">
<p class="mr-2"><small><?php echo _("The default firewall will allow only outgoing and already established traffic. No UDP traffic is allowed.") ?></small></p>
</div>
</div>
<form id="frm-firewall" action="firewall_conf" method="POST" >
<?php echo CSRFTokenFieldTag(); ?>
<h5><?php echo _("Exceptions for Services"); ?></h4>
<div class="row">
<div class="form-group col-md-6">
<div class="custom-control custom-switch">
<input class="custom-control-input" id="ssh-enable" type="checkbox" name="ssh-enable" value="1" aria-describedby="exceptions-description" <?php if ($fw_conf["ssh-enable"]) echo "checked"; ?> >
<label class="custom-control-label" for="ssh-enable"><?php echo _("allow SSH access on port 22") ?></label>
</div>
<div class="custom-control custom-switch">
<input class="custom-control-input" id="http-enable" type="checkbox" name="http-enable" value="1" aria-describedby="exceptions-description" <?php if ($fw_conf["http-enable"]) echo "checked"; ?> >
<label class="custom-control-label" for="http-enable"><?php echo _("allow access to the RaspAP GUI") ?></label>
</div>
<p class="mb-0" id="exceptions-description">
<small><?php echo _("Allow access for some services from the client side.") ?></small>
</p>
</div>
</div>
<?php if ($fw_conf["firewall-enable"]) : ?>
<input type="submit" class="btn btn-outline btn-primary" value="<?php echo _("Apply changes"); ?>" name="apply-firewall" />
<input type="submit" class="btn btn-warning firewall-apply" value="<?php echo _("Disable Firewall") ?>" name="firewall-disable" data-toggle="modal" data-target="#firewallModal"/>
<?php else : ?>
<input type="submit" class="btn btn-outline btn-primary" value="<?php echo _("Save"); ?>" name="save-firewall" />
<input type="submit" class="btn btn-success firewall-apply" value="<?php echo _("Enable Firewall") ?>" name="firewall-enable" data-toggle="modal" data-target="#firewallModal"/>
<?php endif ?>
</form>
</div><!-- /.card-body -->
<div class="card-footer"></div>
</div><!-- /.card -->
</div><!-- /.col-lg-12 -->
</div><!-- /.row -->
<!-- Modal -->
<div class="modal fade" id="firewallModal" tabindex="-1" role="dialog" aria-labelledby="ModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<div class="modal-title" id="ModalLabel">
<i class="fas fa-sync-alt mr-2"></i>
<?php if($fw_conf["firewall-enable"]) echo _("Disable the firewall ..."); else echo _("Enable the Firewall ..."); ?>
</div>
<button type="button" class="close" data-dismiss="modal" aria-label="Close"> <span aria-hidden="true">&times;</span>
</div>
</div>
</div>