Allow redirecting DNS requests to Tor for specific users or globally.

README

@@ -107,7 +107,18 @@ rejected. This is intentional: it does not make sense leaking -via DNS
 requests- network activity that would otherwise be torified. In that
 case you probably want to read proper documentation about such
 matters, enable the Tor DNS resolver and redirect DNS requests through
-it.
+it,
+
+either globally:
+
+  shorewall::rules::torify::redirect_dns_to_tor { '-': }
+
+or for specific users:
+
+  shorewall::rules::torify::redirect_dns_to_tor { ['bob', 'alice' ]: }
+
+The $tor_dns_host and $tor_dns_port variables must be set before
+these defines are setup.
 
 Example
 -------

manifests/init.pp

@@ -28,6 +28,12 @@ class shorewall {
   case $tor_transparent_proxy_port {
     '': { $tor_transparent_proxy_port = '9040' }
   }
+  case $tor_dns_host {
+    '': { $tor_dns_host = '127.0.0.1' }
+  }
+  case $tor_dns_port {
+    '': { $tor_dns_port = '8853' }
+  }
   if $tor_user == '' {
     $tor_user = $dist_tor_user ? {
       ''      => 'tor',

manifests/rules/torify/redirect_dns_to_tor.pp

+define shorewall::rules::torify::redirect_dns_to_tor() {
+
+  $user = $name
+
+  $destzone = $shorewall::tor_dns_host ? {
+    '127.0.0.1' => '$FW',
+    default     => 'net'
+  }
+
+  $tcp_rule = "redirect-tcp-dns-to-tor-user=${user}"
+  if !defined(Shorewall::Rule["$tcp_rule"]) {
+    shorewall::rule {
+      "$tcp_rule":
+        source          => '$FW',
+        destination     => "${destzone}:${shorewall::tor_dns_host}:${shorewall::tor_dns_port}",
+        proto           => 'tcp',
+        destinationport => 'domain',
+        user            => $user,
+        order           => 108,
+        action          => 'DNAT';
+    }
+  }
+
+  $udp_rule = "redirect-udp-dns-to-tor-user=${user}"
+  if !defined(Shorewall::Rule["$udp_rule"]) {
+    shorewall::rule {
+      "$udp_rule":
+        source          => '$FW',
+        destination     => "${destzone}:${shorewall::tor_dns_host}:${shorewall::tor_dns_port}",
+        proto           => 'udp',
+        destinationport => 'domain',
+        user            => $user,
+        order           => 108,
+        action          => 'DNAT';
+    }
+  }
+
+}