160 lines
4.4 KiB
Nix
160 lines
4.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.libreswan;
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libexec = "${pkgs.libreswan}/libexec/ipsec";
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ipsec = "${pkgs.libreswan}/sbin/ipsec";
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trim = chars: str:
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let
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nonchars = filter (x : !(elem x.value chars))
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(imap0 (i: v: {ind = i; value = v;}) (stringToCharacters str));
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in
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if length nonchars == 0 then ""
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else substring (head nonchars).ind (add 1 (sub (last nonchars).ind (head nonchars).ind)) str;
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indent = str: concatStrings (concatMap (s: [" " (trim [" " "\t"] s) "\n"]) (splitString "\n" str));
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configText = indent (toString cfg.configSetup);
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connectionText = concatStrings (mapAttrsToList (n: v:
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''
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conn ${n}
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${indent v}
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'') cfg.connections);
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configFile = pkgs.writeText "ipsec-nixos.conf"
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''
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config setup
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${configText}
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${connectionText}
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'';
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policyFiles = mapAttrs' (name: text:
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{ name = "ipsec.d/policies/${name}";
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value.source = pkgs.writeText "ipsec-policy-${name}" text;
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}) cfg.policies;
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in
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{
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###### interface
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options = {
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services.libreswan = {
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enable = mkEnableOption (lib.mdDoc "Libreswan IPsec service");
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configSetup = mkOption {
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type = types.lines;
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default = ''
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protostack=netkey
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virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:25.0.0.0/8,%v4:100.64.0.0/10,%v6:fd00::/8,%v6:fe80::/10
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'';
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example = ''
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secretsfile=/root/ipsec.secrets
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protostack=netkey
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virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:25.0.0.0/8,%v4:100.64.0.0/10,%v6:fd00::/8,%v6:fe80::/10
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'';
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description = lib.mdDoc "Options to go in the 'config setup' section of the Libreswan IPsec configuration";
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};
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connections = mkOption {
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type = types.attrsOf types.lines;
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default = {};
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example = literalExpression ''
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{ myconnection = '''
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auto=add
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left=%defaultroute
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leftid=@user
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right=my.vpn.com
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ikev2=no
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ikelifetime=8h
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''';
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}
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'';
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description = lib.mdDoc "A set of connections to define for the Libreswan IPsec service";
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};
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policies = mkOption {
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type = types.attrsOf types.lines;
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default = {};
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example = literalExpression ''
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{ private-or-clear = '''
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# Attempt opportunistic IPsec for the entire Internet
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0.0.0.0/0
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::/0
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''';
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}
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'';
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description = lib.mdDoc ''
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A set of policies to apply to the IPsec connections.
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::: {.note}
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The policy name must match the one of connection it needs to apply to.
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:::
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'';
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};
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disableRedirects = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether to disable send and accept redirects for all network interfaces.
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See the Libreswan [
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FAQ](https://libreswan.org/wiki/FAQ#Why_is_it_recommended_to_disable_send_redirects_in_.2Fproc.2Fsys.2Fnet_.3F) page for why this is recommended.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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# Install package, systemd units, etc.
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environment.systemPackages = [ pkgs.libreswan pkgs.iproute2 ];
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systemd.packages = [ pkgs.libreswan ];
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systemd.tmpfiles.packages = [ pkgs.libreswan ];
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# Install configuration files
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environment.etc = {
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"ipsec.secrets".source = "${pkgs.libreswan}/etc/ipsec.secrets";
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"ipsec.conf".source = "${pkgs.libreswan}/etc/ipsec.conf";
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"ipsec.d/01-nixos.conf".source = configFile;
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} // policyFiles;
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# Create NSS database directory
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systemd.tmpfiles.rules = [ "d /var/lib/ipsec/nss 755 root root -" ];
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systemd.services.ipsec = {
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description = "Internet Key Exchange (IKE) Protocol Daemon for IPsec";
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wantedBy = [ "multi-user.target" ];
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restartTriggers = [ configFile ] ++ mapAttrsToList (n: v: v.source) policyFiles;
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path = with pkgs; [
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libreswan
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iproute2
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procps
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nssTools
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iptables
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nettools
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];
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preStart = optionalString cfg.disableRedirects ''
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# Disable send/receive redirects
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echo 0 | tee /proc/sys/net/ipv4/conf/*/send_redirects
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echo 0 | tee /proc/sys/net/ipv{4,6}/conf/*/accept_redirects
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'';
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};
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};
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}
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