118 lines
2.7 KiB
Nix
118 lines
2.7 KiB
Nix
## Firewall
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## ========
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##
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## Provides a service to create an nftables ruleset based on
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## configuration supplied to it.
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{ lib, pkgs, config, ...}:
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let
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inherit (lib) mkOption types;
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inherit (pkgs) liminix;
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inherit (pkgs.liminix.services) oneshot;
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kconf = isModule :
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# setting isModule false is utterly untested and mostly
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# unimplemented: I say this to preempt any "how on earth is this
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# even supposed to work?" questions
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let yes = if isModule then "m" else "y";
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in {
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NETFILTER = "y";
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NETFILTER_ADVANCED = "y";
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NETFILTER_NETLINK = yes;
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NF_CONNTRACK = yes;
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IP6_NF_IPTABLES= yes;
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IP_NF_IPTABLES = yes;
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IP_NF_NAT = yes;
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IP_NF_TARGET_MASQUERADE = yes;
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NFT_CT = yes;
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NFT_FIB_IPV4 = yes;
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NFT_FIB_IPV6 = yes;
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NFT_LOG = yes;
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NFT_MASQ = yes;
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NFT_NAT = yes;
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NFT_REJECT = yes;
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NFT_REJECT_INET = yes;
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NF_CT_PROTO_DCCP = "y";
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NF_CT_PROTO_SCTP = "y";
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NF_CT_PROTO_UDPLITE = "y";
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NF_LOG_SYSLOG = yes;
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NF_NAT = yes;
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NF_NAT_MASQUERADE = "y";
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NF_TABLES = yes;
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NF_TABLES_INET = "y";
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NF_TABLES_IPV4 = "y";
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NF_TABLES_IPV6 = "y";
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};
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kmodules = pkgs.kernel-modules.override {
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kernelSrc = config.system.outputs.kernel.src;
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modulesupport = config.system.outputs.kernel.modulesupport;
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targets = [
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"nft_fib_ipv4"
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"nft_fib_ipv6"
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"nf_log_syslog"
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"ip6_tables"
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"ip_tables"
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"iptable_nat"
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"nf_conntrack"
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"nf_defrag_ipv4"
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"nf_defrag_ipv6"
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"nf_log_syslog"
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"nf_nat"
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"nf_reject_ipv4"
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"nf_reject_ipv6"
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"nf_tables"
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"nft_chain_nat"
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"nft_ct"
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"nft_fib"
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"nft_fib_ipv4"
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"nft_fib_ipv6"
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"nft_log"
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"nft_masq"
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"nft_nat"
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"nft_reject"
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"nft_reject_inet"
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"nft_reject_ipv4"
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"nft_reject_ipv6"
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"x_tables"
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"xt_MASQUERADE"
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"xt_nat"
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"xt_tcpudp"
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];
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kconfig = kconf true;
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};
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loadModules = oneshot {
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name = "firewall-modules";
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up = "sh ${kmodules}/load.sh";
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down = "sh ${kmodules}/unload.sh";
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};
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in
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{
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options = {
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system.service.firewall = mkOption {
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type = liminix.lib.types.serviceDefn;
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};
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};
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config = {
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system.service.firewall =
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let svc = liminix.callService ./service.nix {
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ruleset = mkOption {
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type = types.attrsOf types.attrs; # we could usefully tighten this a bit :-)
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description = "firewall ruleset";
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};
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};
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in svc // {
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build = args :
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let args' = args // {
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dependencies = (args.dependencies or []) ++ [loadModules];
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};
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in svc.build args' ;
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};
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kernel.config = kconf true;
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};
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}
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