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wireguard: add each peer in a separate service

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Before, changing any peers caused the entire WireGuard interface to
be torn down and rebuilt. By configuring each peer in a separate
service we're able to only restart the affected peers.

Adding each peer individually also means individual peer
configurations can fail, but the overall interface and all other peers
will still be added.

A WireGuard peer's internal identifier is its public key. This means
it is the only reliable identifier to use for the systemd service.
This commit is contained in:
Graham Christensen 2019-05-31 14:32:43 -04:00
parent 0c6fb79dd7
commit dc44fc1760
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GPG Key ID: ACA1C1D120C83D5C
1 changed files with 69 additions and 26 deletions
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95
nixos/modules/services/networking/wireguard.nix
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@ -229,8 +229,60 @@ let
'';
};
generatePeerUnit = { interfaceName, interfaceCfg, peer }:
let
keyToUnitName = replaceChars
[ "/" "-" " " "+" "=" ]
[ "-" "\\x2d" "\\x20" "\\x2b" "\\x3d" ];
unitName = keyToUnitName peer.publicKey;
psk =
if peer.presharedKey != null
then pkgs.writeText "wg-psk" peer.presharedKey
else peer.presharedKeyFile;
in nameValuePair "wireguard-${interfaceName}-peer-${unitName}"
{
description = "WireGuard Peer - ${interfaceName} - ${peer.publicKey}";
requires = [ "wireguard-${interfaceName}.service" ];
after = [ "wireguard-${interfaceName}.service" ];
wantedBy = [ "multi-user.target" ];
environment.DEVICE = interfaceName;
path = with pkgs; [ iproute wireguard-tools ];
generateSetupServiceUnit = name: values:
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
};
script = let
wg_setup = "wg set ${interfaceName} peer ${peer.publicKey}" +
optionalString (psk != null) " preshared-key ${psk}" +
optionalString (peer.endpoint != null) " endpoint ${peer.endpoint}" +
optionalString (peer.persistentKeepalive != null) " persistent-keepalive ${toString peer.persistentKeepalive}" +
optionalString (peer.allowedIPs != []) " allowed-ips ${concatStringsSep "," peer.allowedIPs}";
route_setup =
optionalString (interfaceCfg.allowedIPsAsRoutes != false)
(concatMapStringsSep "\n"
(allowedIP:
"ip route replace ${allowedIP} dev ${interfaceName} table ${interfaceCfg.table}"
) peer.allowedIPs);
in ''
${wg_setup}
${route_setup}
'';
postStop = let
route_destroy = optionalString (interfaceCfg.allowedIPsAsRoutes != false)
(concatMapStringsSep "\n"
(allowedIP:
"ip route delete ${allowedIP} dev ${interfaceName} table ${interfaceCfg.table}"
) peer.allowedIPs);
in ''
wg set ${interfaceName} peer ${peer.publicKey} remove
${route_destroy}
'';
};
generateInterfaceUnit = name: values:
# exactly one way to specify the private key must be set
#assert (values.privateKey != null) != (values.privateKeyFile != null);
let privKey = if values.privateKeyFile != null then values.privateKeyFile else pkgs.writeText "wg-key" values.privateKey;
@ -245,9 +297,7 @@ let
path = with pkgs; [ kmod iproute wireguard-tools ];
serviceConfig = {
Type = "simple";
Restart = "on-failure";
RestartSec = "5s";
Type = "oneshot";
RemainAfterExit = true;
};
@ -265,25 +315,8 @@ let
wg set ${name} private-key ${privKey} ${
optionalString (values.listenPort != null) " listen-port ${toString values.listenPort}"}
${concatMapStringsSep "\n" (peer:
assert (peer.presharedKeyFile == null) || (peer.presharedKey == null); # at most one of the two must be set
let psk = if peer.presharedKey != null then pkgs.writeText "wg-psk" peer.presharedKey else peer.presharedKeyFile;
in
"wg set ${name} peer ${peer.publicKey}" +
optionalString (psk != null) " preshared-key ${psk}" +
optionalString (peer.endpoint != null) " endpoint ${peer.endpoint}" +
optionalString (peer.persistentKeepalive != null) " persistent-keepalive ${toString peer.persistentKeepalive}" +
optionalString (peer.allowedIPs != []) " allowed-ips ${concatStringsSep "," peer.allowedIPs}"
) values.peers}
ip link set up dev ${name}
${optionalString (values.allowedIPsAsRoutes != false) (concatStringsSep "\n" (concatMap (peer:
(map (allowedIP:
"ip route replace ${allowedIP} dev ${name} table ${values.table}"
) peer.allowedIPs)
) values.peers))}
${values.postSetup}
'';
@ -335,7 +368,12 @@ in
###### implementation
config = mkIf cfg.enable {
config = mkIf cfg.enable (let
all_peers = flatten
(mapAttrsToList (interfaceName: interfaceCfg:
map (peer: { inherit interfaceName interfaceCfg peer;}) interfaceCfg.peers
) cfg.interfaces);
in {
assertions = (attrValues (
mapAttrs (name: value: {
@ -346,19 +384,24 @@ in
mapAttrs (name: value: {
assertion = value.generatePrivateKeyFile -> (value.privateKey == null);
message = "networking.wireguard.interfaces.${name}.generatePrivateKey must not be set if networking.wireguard.interfaces.${name}.privateKey is set.";
}) cfg.interfaces));
}) cfg.interfaces))
++ map ({ interfaceName, peer, ... }: {
assertion = (peer.presharedKey == null) || (peer.presharedKeyFile == null);
message = "networking.wireguard.interfaces.${interfaceName} peer «${peer.publicKey}» has both presharedKey and presharedKeyFile set, but only one can be used.";
}) all_peers;
boot.extraModulePackages = [ kernel.wireguard ];
environment.systemPackages = [ pkgs.wireguard-tools ];
systemd.services = (mapAttrs' generateSetupServiceUnit cfg.interfaces)
systemd.services =
(mapAttrs' generateInterfaceUnit cfg.interfaces)
// (listToAttrs (map generatePeerUnit all_peers))
// (mapAttrs' generateKeyServiceUnit
(filterAttrs (name: value: value.generatePrivateKeyFile) cfg.interfaces));
systemd.paths = mapAttrs' generatePathUnit
(filterAttrs (name: value: value.privateKeyFile != null) cfg.interfaces);
};
});
}