servers/mermet/shorewall.nix

   1 { pkgs, lib, config, ... }:
   2 let
   3   inherit (builtins) hasAttr readFile;
   4   inherit (pkgs.lib) unlinesAttrs;
   5   inherit (config.users) users;
   6   inherit (config.services) shorewall shorewall6;
   7   fw2net = ''
   8     # By protocol
   9     Ping(ACCEPT)   $FW net
  10
  11     # By port
  12     DNS(ACCEPT)    $FW net {user=${users.unbound.name}}
  13     DNS(ACCEPT)    $FW net:217.70.177.40 # for knot to notify ns6.gandi.net
  14     DNS(ACCEPT)    $FW net:78.192.65.63  # for knot to notify ns0.muarf.org
  15     Git(ACCEPT)    $FW net
  16     HKP(ACCEPT)    $FW net {user=${users.julm.name}}
  17     HTTP(ACCEPT)   $FW net
  18     HTTPS(ACCEPT)  $FW net
  19     IRCS(ACCEPT)   $FW net {user=${users.julm.name}}
  20     NTP(ACCEPT)    $FW net {user=${users.systemd-timesync.name}}
  21     SMTP(ACCEPT)   $FW net
  22     SMTPS(ACCEPT)  $FW net
  23     SSH(ACCEPT)    $FW net
  24   '';
  25   net2fw = ''
  26     # By protocol
  27     Ping(ACCEPT)   net $FW
  28
  29     # By port
  30     DNS(ACCEPT)    net $FW
  31     Git(ACCEPT)    net $FW
  32     HTTP(ACCEPT)   net $FW
  33     HTTPS(ACCEPT)  net $FW
  34     IMAPS(ACCEPT)  net $FW
  35     Mosh(ACCEPT)   net $FW
  36     ACCEPT         net $FW {proto=tcp, dport=8080}
  37     POP3S(ACCEPT)  net $FW
  38     SMTP(ACCEPT)   net $FW
  39     SMTPS(ACCEPT)  net $FW
  40     SSH(ACCEPT)    net $FW {rate=s:1/min:10}
  41     Sieve(ACCEPT)  net $FW
  42   '';
  43   fw2lan = ''
  44     Ping(ACCEPT)   $FW lan
  45     DNS(ACCEPT)    $FW lan
  46     HTTPS(ACCEPT)  $FW lan
  47   '';
  48   lan2fw = ''
  49     Ping(ACCEPT)   lan $FW
  50     SSH(ACCEPT)    lan $FW
  51     HTTP(ACCEPT)   lan $FW
  52     HTTPS(ACCEPT)  lan $FW
  53     DNS(ACCEPT)    lan $FW
  54   '';
  55   macros = {
  56     "macro.Git" = ''
  57       ?FORMAT 2
  58       #ACTION SOURCE  DEST    PROTO   DEST    SOURCE  RATE    USER/
  59       #                               PORT(S) PORT(S) LIMIT   GROUP
  60       PARAM   -       -       tcp     9418
  61     '';
  62     "macro.IRCS" = ''
  63       ?FORMAT 2
  64       #ACTION SOURCE  DEST    PROTO   DEST    SOURCE  RATE    USER/
  65       #                               PORT(S) PORT(S) LIMIT   GROUP
  66       PARAM   -       -       tcp     6697
  67     '';
  68     "macro.Mosh" = ''
  69       ?FORMAT 2
  70       #ACTION SOURCE  DEST    PROTO   DEST    SOURCE  RATE    USER/
  71       #                               PORT(S) PORT(S) LIMIT   GROUP
  72       PARAM   -       -       udp     60000-61000
  73     '';
  74   };
  75 in
  76 {
  77 services.shorewall = {
  78   enable  = true;
  79   configs = macros // {
  80     "shorewall.conf" = ''
  81       ${readFile "${shorewall.package}/etc-example/shorewall/shorewall.conf"}
  82       #
  83       ## Custom config
  84       ###
  85       STARTUP_ENABLED=Yes
  86       ZONE2ZONE=2
  87     '';
  88     zones = ''
  89       # DOC: shorewall-zones(5)
  90       fw firewall
  91       net    ipv4
  92       lan    ipv4
  93       unused ipv4
  94     '';
  95     interfaces = ''
  96       # DOC: shorewall-interfaces(5)
  97       ?FORMAT 2
  98       net    enp1s0 arp_filter,nosmurfs,routefilter=1,tcpflags
  99       lan    enp2s0 arp_filter,nosmurfs,routefilter=1,tcpflags
 100       unused enp3s0 arp_filter,nosmurfs,routefilter=1,tcpflags
 101     '';
 102     policy = ''
 103       # DOC: shorewall-policy(5)
 104       $FW    all DROP
 105       lan    all DROP   none
 106       net    all DROP   none
 107       unused all DROP   none
 108       # WARNING: the following policy must be last
 109       all    all REJECT none
 110     '';
 111     rules = ''
 112       # DOC: shorewall-rules(5)
 113       #SECTION ALL
 114       #SECTION ESTABLISHED
 115       #SECTION RELATED
 116       ?SECTION NEW
 117
 118       ${fw2net}
 119       ${net2fw}
 120
 121       ${fw2lan}
 122       ${lan2fw}
 123     '';
 124   };
 125 };
 126 services.shorewall6 = {
 127   enable  = true;
 128   configs = macros // {
 129     "shorewall6.conf" = ''
 130       ${readFile "${shorewall6.package}/etc-example/shorewall6/shorewall6.conf"}
 131       #
 132       ## Custom config
 133       ###
 134       STARTUP_ENABLED=Yes
 135       ZONE2ZONE=2
 136       '';
 137     zones = ''
 138       # DOC: shorewall-zones(5)
 139       fw firewall
 140       net    ipv6
 141       lan    ipv6
 142       unused ipv6
 143     '';
 144     interfaces = ''
 145       # DOC: shorewall-interfaces(5)
 146       ?FORMAT 2
 147       net    enp1s0 nosmurfs,tcpflags
 148       lan    enp2s0 nosmurfs,tcpflags
 149       unused enp3s0 nosmurfs,tcpflags
 150     '';
 151     policy = ''
 152       # DOC: shorewall-policy(5)
 153       $FW    all DROP
 154       lan    all DROP   none
 155       net    all DROP   none
 156       unused all DROP   none
 157       # WARNING: the following policy must be last
 158       all    all REJECT none
 159     '';
 160     rules = ''
 161       # DOC: shorewall-rules(5)
 162       #SECTION ALL
 163       #SECTION ESTABLISHED
 164       #SECTION RELATED
 165       ?SECTION NEW
 166
 167       ${fw2net}
 168       ${net2fw}
 169
 170       ${fw2lan}
 171       ${lan2fw}
 172     '';
 173   };
 174 };
 175 }