nixos/libreswan: update for version 4.x

- Use upstream unit files
- Remove deprecated config options
- Add option to disable redirects
- Add option to configure policies
This commit is contained in:
rnhmjoj 2021-05-13 12:37:59 +02:00
parent 90d6e6fe0f
commit 1a4db01c84
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@ -9,21 +9,22 @@ let
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;
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.conf"
configFile = pkgs.writeText "ipsec-nixos.conf"
''
config setup
${configText}
@ -31,6 +32,11 @@ let
${connectionText}
'';
policyFiles = mapAttrs' (name: text:
{ name = "ipsec.d/policies/${name}";
value.source = pkgs.writeText "ipsec-policy-${name}" text;
}) cfg.policies;
in
{
@ -41,41 +47,71 @@ in
services.libreswan = {
enable = mkEnableOption "libreswan ipsec service";
enable = mkEnableOption "Libreswan IPsec service";
configSetup = mkOption {
type = types.lines;
default = ''
protostack=netkey
nat_traversal=yes
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
nat_traversal=yes
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";
description = "Options to go in the 'config setup' section of the Libreswan IPsec configuration";
};
connections = mkOption {
type = types.attrsOf types.lines;
default = {};
example = {
myconnection = ''
auto=add
left=%defaultroute
leftid=@user
example = literalExample ''
{ myconnection = '''
auto=add
left=%defaultroute
leftid=@user
right=my.vpn.com
right=my.vpn.com
ikev2=no
ikelifetime=8h
'';
};
description = "A set of connections to define for the libreswan ipsec service";
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 = literalExample ''
{ 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.
'';
};
};
};
@ -85,43 +121,38 @@ in
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 = "${pkgs.libreswan}/etc/ipsec.conf";
"ipsec.d/01-nixos.conf".source = configFile;
} // policyFiles;
# Create NSS database directory
systemd.tmpfiles.rules = [ "d /var/lib/ipsec/nss 755 root root -" ];
systemd.services.ipsec = {
description = "Internet Key Exchange (IKE) Protocol Daemon for IPsec";
path = [
"${pkgs.libreswan}"
"${pkgs.iproute2}"
"${pkgs.procps}"
"${pkgs.nssTools}"
"${pkgs.iptables}"
"${pkgs.nettools}"
];
wants = [ "network-online.target" ];
after = [ "network-online.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
Type = "simple";
Restart = "always";
EnvironmentFile = "-${pkgs.libreswan}/etc/sysconfig/pluto";
ExecStartPre = [
"${libexec}/addconn --config ${configFile} --checkconfig"
"${libexec}/_stackmanager start"
"${ipsec} --checknss"
"${ipsec} --checknflog"
];
ExecStart = "${libexec}/pluto --config ${configFile} --nofork \$PLUTO_OPTIONS";
ExecStop = "${libexec}/whack --shutdown";
ExecStopPost = [
"${pkgs.iproute2}/bin/ip xfrm policy flush"
"${pkgs.iproute2}/bin/ip xfrm state flush"
"${ipsec} --stopnflog"
];
ExecReload = "${libexec}/whack --listen";
};
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
'';
};
};