diff options
Diffstat (limited to 'nixos/modules/services/networking/libreswan.nix')
| -rw-r--r-- | nixos/modules/services/networking/libreswan.nix | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/nixos/modules/services/networking/libreswan.nix b/nixos/modules/services/networking/libreswan.nix new file mode 100644 index 00000000000..429167aed9d --- /dev/null +++ b/nixos/modules/services/networking/libreswan.nix @@ -0,0 +1,160 @@ +{ config, lib, pkgs, ... }: + +with lib; + +let + + cfg = config.services.libreswan; + + libexec = "${pkgs.libreswan}/libexec/ipsec"; + ipsec = "${pkgs.libreswan}/sbin/ipsec"; + + trim = chars: str: + let + nonchars = filter (x : !(elem x.value chars)) + (imap0 (i: v: {ind = i; value = v;}) (stringToCharacters str)); + in + if length nonchars == 0 then "" + else substring (head nonchars).ind (add 1 (sub (last nonchars).ind (head nonchars).ind)) str; + indent = str: concatStrings (concatMap (s: [" " (trim [" " "\t"] s) "\n"]) (splitString "\n" str)); + configText = indent (toString cfg.configSetup); + connectionText = concatStrings (mapAttrsToList (n: v: + '' + conn ${n} + ${indent v} + '') cfg.connections); + + configFile = pkgs.writeText "ipsec-nixos.conf" + '' + config setup + ${configText} + + ${connectionText} + ''; + + policyFiles = mapAttrs' (name: text: + { name = "ipsec.d/policies/${name}"; + value.source = pkgs.writeText "ipsec-policy-${name}" text; + }) cfg.policies; + +in + +{ + + ###### interface + + options = { + + services.libreswan = { + + enable = mkEnableOption "Libreswan IPsec service"; + + configSetup = mkOption { + type = types.lines; + default = '' + protostack=netkey + 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 + ''; + example = '' + secretsfile=/root/ipsec.secrets + protostack=netkey + 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 + ''; + description = "Options to go in the 'config setup' section of the Libreswan IPsec configuration"; + }; + + connections = mkOption { + type = types.attrsOf types.lines; + default = {}; + example = literalExpression '' + { myconnection = ''' + auto=add + left=%defaultroute + leftid=@user + + right=my.vpn.com + + ikev2=no + ikelifetime=8h + '''; + } + ''; + description = "A set of connections to define for the Libreswan IPsec service"; + }; + + policies = mkOption { + type = types.attrsOf types.lines; + default = {}; + example = literalExpression '' + { private-or-clear = ''' + # Attempt opportunistic IPsec for the entire Internet + 0.0.0.0/0 + ::/0 + '''; + } + ''; + description = '' + A set of policies to apply to the IPsec connections. + + <note><para> + The policy name must match the one of connection it needs to apply to. + </para></note> + ''; + }; + + disableRedirects = mkOption { + type = types.bool; + default = true; + description = '' + Whether to disable send and accept redirects for all nework interfaces. + See the Libreswan <link xlink:href="https://libreswan.org/wiki/FAQ#Why_is_it_recommended_to_disable_send_redirects_in_.2Fproc.2Fsys.2Fnet_.3F"> + FAQ</link> page for why this is recommended. + ''; + }; + + }; + + }; + + + ###### implementation + + config = mkIf cfg.enable { + + # Install package, systemd units, etc. + environment.systemPackages = [ pkgs.libreswan pkgs.iproute2 ]; + systemd.packages = [ pkgs.libreswan ]; + systemd.tmpfiles.packages = [ pkgs.libreswan ]; + + # Install configuration files + environment.etc = { + "ipsec.secrets".source = "${pkgs.libreswan}/etc/ipsec.secrets"; + "ipsec.conf".source = "${pkgs.libreswan}/etc/ipsec.conf"; + "ipsec.d/01-nixos.conf".source = configFile; + } // policyFiles; + + # Create NSS database directory + systemd.tmpfiles.rules = [ "d /var/lib/ipsec/nss 755 root root -" ]; + + systemd.services.ipsec = { + description = "Internet Key Exchange (IKE) Protocol Daemon for IPsec"; + wantedBy = [ "multi-user.target" ]; + restartTriggers = [ configFile ] ++ mapAttrsToList (n: v: v.source) policyFiles; + path = with pkgs; [ + libreswan + iproute2 + procps + nssTools + iptables + nettools + ]; + preStart = optionalString cfg.disableRedirects '' + # Disable send/receive redirects + echo 0 | tee /proc/sys/net/ipv4/conf/*/send_redirects + echo 0 | tee /proc/sys/net/ipv{4,6}/conf/*/accept_redirects + ''; + }; + + }; + +} |