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     HTTP(ACCEPT)   lan $FW
  41     DNS(ACCEPT)    lan $FW
  42   '';
  43   macros = {
  44     "macro.Git" = ''
  45       ?FORMAT 2
  46       #ACTION SOURCE  DEST    PROTO   DEST    SOURCE  RATE    USER/
  47       #                               PORT(S) PORT(S) LIMIT   GROUP
  48       PARAM   -       -       tcp     9418
  49     '';
  50   };
  51 in
  52 {
  53 config = {
  54   services.shorewall = {
  55     enable  = true;
  56     configs = macros // {
  57       "shorewall.conf" = ''
  58         ${readFile "${shorewall.package}/etc-example/shorewall/shorewall.conf"}
  59         #
  60         ## Custom config
  61         ###
  62         STARTUP_ENABLED=Yes
  63         ZONE2ZONE=2
  64       '';
  65       zones = ''
  66         # DOC: shorewall-zones(5)
  67         fw firewall
  68         net    ipv4
  69         lan    ipv4
  70         unused ipv4
  71       '';
  72       interfaces = ''
  73         # DOC: shorewall-interfaces(5)
  74         ?FORMAT 2
  75         net    enp1s0 arp_filter,nosmurfs,routefilter=1,tcpflags
  76         lan    enp2s0 arp_filter,nosmurfs,routefilter=1,tcpflags,dhcp
  77         unused enp3s0 arp_filter,nosmurfs,routefilter=1,tcpflags
  78       '';
  79       policy = ''
  80         # DOC: shorewall-policy(5)
  81         $FW    all DROP
  82         lan    all DROP   none
  83         net    all DROP   none
  84         unused all DROP   none
  85         # WARNING: the following policy must be last
  86         all    all REJECT none
  87       '';
  88       rules = ''
  89         # DOC: shorewall-rules(5)
  90         #SECTION ALL
  91         #SECTION ESTABLISHED
  92         #SECTION RELATED
  93         ?SECTION NEW
  94
  95         ${fw2net}
  96         ${net2fw}
  97
  98         ${fw2lan}
  99         ${lan2fw}
 100       '';
 101     };
 102   };
 103   services.shorewall6 = {
 104     enable  = true;
 105     configs = macros // {
 106       "shorewall6.conf" = ''
 107         ${readFile "${shorewall6.package}/etc-example/shorewall6/shorewall6.conf"}
 108         #
 109         ## Custom config
 110         ###
 111         STARTUP_ENABLED=Yes
 112         ZONE2ZONE=2
 113         '';
 114       zones = ''
 115         # DOC: shorewall-zones(5)
 116         fw firewall
 117         net    ipv6
 118         lan    ipv6
 119         unused ipv6
 120       '';
 121       interfaces = ''
 122         # DOC: shorewall-interfaces(5)
 123         ?FORMAT 2
 124         net    enp1s0 nosmurfs,tcpflags
 125         lan    enp2s0 nosmurfs,tcpflags
 126         unused enp3s0 nosmurfs,tcpflags
 127       '';
 128       policy = ''
 129         # DOC: shorewall-policy(5)
 130         $FW    all DROP
 131         lan    all DROP   none
 132         net    all DROP   none
 133         unused all DROP   none
 134         # WARNING: the following policy must be last
 135         all    all REJECT none
 136       '';
 137       rules = ''
 138         # DOC: shorewall-rules(5)
 139         #SECTION ALL
 140         #SECTION ESTABLISHED
 141         #SECTION RELATED
 142         ?SECTION NEW
 143
 144         ${fw2net}
 145         ${net2fw}
 146
 147         ${fw2lan}
 148         ${lan2fw}
 149       '';
 150     };
 151   };
 152 };
 153 }