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     Mosh(ACCEPT)   net $FW
  28     POP3S(ACCEPT)  net $FW
  29     SMTP(ACCEPT)   net $FW
  30     SMTPS(ACCEPT)  net $FW
  31     SSH(ACCEPT)    net $FW
  32   '';
  33   fw2lan = ''
  34     Ping(ACCEPT)   $FW lan
  35     DNS(ACCEPT)    $FW lan
  36     HTTPS(ACCEPT)  $FW lan
  37   '';
  38   lan2fw = ''
  39     Ping(ACCEPT)   lan $FW
  40     SSH(ACCEPT)    lan $FW
  41     HTTP(ACCEPT)   lan $FW
  42     HTTPS(ACCEPT)  lan $FW
  43     DNS(ACCEPT)    lan $FW
  44   '';
  45   macros = {
  46     "macro.Git" = ''
  47       ?FORMAT 2
  48       #ACTION SOURCE  DEST    PROTO   DEST    SOURCE  RATE    USER/
  49       #                               PORT(S) PORT(S) LIMIT   GROUP
  50       PARAM   -       -       tcp     9418
  51     '';
  52     "macro.Mosh" = ''
  53       ?FORMAT 2
  54       #ACTION SOURCE  DEST    PROTO   DEST    SOURCE  RATE    USER/
  55       #                               PORT(S) PORT(S) LIMIT   GROUP
  56       PARAM   -       -       udp     60000-61000
  57     '';
  58   };
  59 in
  60 {
  61   services.shorewall = {
  62     enable  = true;
  63     configs = macros // {
  64       "shorewall.conf" = ''
  65         ${readFile "${shorewall.package}/etc-example/shorewall/shorewall.conf"}
  66         #
  67         ## Custom config
  68         ###
  69         STARTUP_ENABLED=Yes
  70         ZONE2ZONE=2
  71       '';
  72       zones = ''
  73         # DOC: shorewall-zones(5)
  74         fw firewall
  75         net    ipv4
  76         lan    ipv4
  77         unused ipv4
  78       '';
  79       interfaces = ''
  80         # DOC: shorewall-interfaces(5)
  81         ?FORMAT 2
  82         net    enp1s0 arp_filter,nosmurfs,routefilter=1,tcpflags
  83         lan    enp2s0 arp_filter,nosmurfs,routefilter=1,tcpflags,dhcp
  84         unused enp3s0 arp_filter,nosmurfs,routefilter=1,tcpflags
  85       '';
  86       policy = ''
  87         # DOC: shorewall-policy(5)
  88         $FW    all DROP
  89         lan    all DROP   none
  90         net    all DROP   none
  91         unused all DROP   none
  92         # WARNING: the following policy must be last
  93         all    all REJECT none
  94       '';
  95       rules = ''
  96         # DOC: shorewall-rules(5)
  97         #SECTION ALL
  98         #SECTION ESTABLISHED
  99         #SECTION RELATED
 100         ?SECTION NEW
 101
 102         ${fw2net}
 103         ${net2fw}
 104
 105         ${fw2lan}
 106         ${lan2fw}
 107       '';
 108     };
 109   };
 110   services.shorewall6 = {
 111     enable  = true;
 112     configs = macros // {
 113       "shorewall6.conf" = ''
 114         ${readFile "${shorewall6.package}/etc-example/shorewall6/shorewall6.conf"}
 115         #
 116         ## Custom config
 117         ###
 118         STARTUP_ENABLED=Yes
 119         ZONE2ZONE=2
 120         '';
 121       zones = ''
 122         # DOC: shorewall-zones(5)
 123         fw firewall
 124         net    ipv6
 125         lan    ipv6
 126         unused ipv6
 127       '';
 128       interfaces = ''
 129         # DOC: shorewall-interfaces(5)
 130         ?FORMAT 2
 131         net    enp1s0 nosmurfs,tcpflags
 132         lan    enp2s0 nosmurfs,tcpflags
 133         unused enp3s0 nosmurfs,tcpflags
 134       '';
 135       policy = ''
 136         # DOC: shorewall-policy(5)
 137         $FW    all DROP
 138         lan    all DROP   none
 139         net    all DROP   none
 140         unused all DROP   none
 141         # WARNING: the following policy must be last
 142         all    all REJECT none
 143       '';
 144       rules = ''
 145         # DOC: shorewall-rules(5)
 146         #SECTION ALL
 147         #SECTION ESTABLISHED
 148         #SECTION RELATED
 149         ?SECTION NEW
 150
 151         ${fw2net}
 152         ${net2fw}
 153
 154         ${fw2lan}
 155         ${lan2fw}
 156       '';
 157     };
 158   };
 159 }