servers/mermet/shorewall.nix

   1 { pkgs, lib, config, ... }:
   2 let
   3   inherit (builtins) hasAttr readFile;
   4   inherit (pkgs.lib) unlinesAttrs;
   5   inherit (config.services) shorewall shorewall6;
   6   fw2net = ''
   7     # By protocol
   8     Ping(ACCEPT)   $FW net
   9
  10     # By port
  11     DNS(ACCEPT)    $FW net
  12     Git(ACCEPT)    $FW net
  13     HTTP(ACCEPT)   $FW net
  14     HTTPS(ACCEPT)  $FW net
  15     SMTP(ACCEPT)   $FW net
  16     SMTPS(ACCEPT)  $FW net
  17     SSH(ACCEPT)    $FW net
  18   '';
  19   net2fw = ''
  20     # By protocol
  21     Ping(ACCEPT)   net $FW
  22
  23     # By port
  24     #HTTPS(ACCEPT) net $FW
  25     DNS(ACCEPT)    net $FW
  26     IMAPS(ACCEPT)  net $FW
  27     POP3S(ACCEPT)  net $FW
  28     SMTP(ACCEPT)   net $FW
  29     SMTPS(ACCEPT)  net $FW
  30     SSH(ACCEPT)    net $FW
  31   '';
  32   fw2lan = ''
  33     Ping(ACCEPT)   $FW lan
  34     DNS(ACCEPT)    $FW lan
  35     HTTPS(ACCEPT)  $FW lan
  36   '';
  37   lan2fw = ''
  38     Ping(ACCEPT)   lan $FW
  39     SSH(ACCEPT)    lan $FW
  40   '';
  41   macros = {
  42     "macro.Git" = ''
  43       ?FORMAT 2
  44       #ACTION SOURCE  DEST    PROTO   DEST    SOURCE  RATE    USER/
  45       #                               PORT(S) PORT(S) LIMIT   GROUP
  46       PARAM   -       -       tcp     9418
  47     '';
  48   };
  49 in
  50 {
  51 config = {
  52   services.shorewall = {
  53     enable  = true;
  54     configs = macros // {
  55       "shorewall.conf" = ''
  56         ${readFile "${shorewall.package}/etc-example/shorewall/shorewall.conf"}
  57         #
  58         ## Custom config
  59         ###
  60         STARTUP_ENABLED=Yes
  61         ZONE2ZONE=2
  62       '';
  63       zones = ''
  64         # DOC: shorewall-zones(5)
  65         fw firewall
  66         net    ipv4
  67         lan    ipv4
  68         unused ipv4
  69       '';
  70       interfaces = ''
  71         # DOC: shorewall-interfaces(5)
  72         ?FORMAT 2
  73         net    enp1s0 arp_filter,nosmurfs,routefilter=1,tcpflags
  74         lan    enp2s0 arp_filter,nosmurfs,routefilter=1,tcpflags,dhcp
  75         unused enp3s0 arp_filter,nosmurfs,routefilter=1,tcpflags
  76       '';
  77       policy = ''
  78         # DOC: shorewall-policy(5)
  79         $FW    all DROP
  80         lan    all DROP   none
  81         net    all DROP   none
  82         unused all DROP   none
  83         # WARNING: the following policy must be last
  84         all    all REJECT none
  85       '';
  86       rules = ''
  87         # DOC: shorewall-rules(5)
  88         #SECTION ALL
  89         #SECTION ESTABLISHED
  90         #SECTION RELATED
  91         ?SECTION NEW
  92
  93         ${fw2net}
  94         ${net2fw}
  95
  96         ${fw2lan}
  97         ${lan2fw}
  98       '';
  99     };
 100   };
 101   services.shorewall6 = {
 102     enable  = true;
 103     configs = macros // {
 104       "shorewall6.conf" = ''
 105         ${readFile "${shorewall6.package}/etc-example/shorewall6/shorewall6.conf"}
 106         #
 107         ## Custom config
 108         ###
 109         STARTUP_ENABLED=Yes
 110         ZONE2ZONE=2
 111         '';
 112       zones = ''
 113         # DOC: shorewall-zones(5)
 114         fw firewall
 115         net    ipv6
 116         lan    ipv6
 117         unused ipv6
 118       '';
 119       interfaces = ''
 120         # DOC: shorewall-interfaces(5)
 121         ?FORMAT 2
 122         net    enp1s0 nosmurfs,tcpflags
 123         lan    enp2s0 nosmurfs,tcpflags
 124         unused enp3s0 nosmurfs,tcpflags
 125       '';
 126       policy = ''
 127         # DOC: shorewall-policy(5)
 128         $FW    all DROP
 129         lan    all DROP   none
 130         net    all DROP   none
 131         unused all DROP   none
 132         # WARNING: the following policy must be last
 133         all    all REJECT none
 134       '';
 135       rules = ''
 136         # DOC: shorewall-rules(5)
 137         #SECTION ALL
 138         #SECTION ESTABLISHED
 139         #SECTION RELATED
 140         ?SECTION NEW
 141
 142         ${fw2net}
 143         ${net2fw}
 144
 145         ${fw2lan}
 146         ${lan2fw}
 147       '';
 148     };
 149   };
 150 };
 151 }