Merge pull request #31019 from teto/strongswan_rebased

[RFC/RDY] make l2tp work with Strongswan

nixos/modules/services/networking/networkmanager.nix

@@ -335,6 +335,7 @@ in {
 
       preStart = ''
         mkdir -m 700 -p /etc/NetworkManager/system-connections
+        mkdir -m 700 -p /etc/ipsec.d
         mkdir -m 755 -p ${stateDirs}
       '';
     };

nixos/modules/services/networking/strongswan.nix

@@ -32,13 +32,13 @@ let
       ${caConf}
     '';
 
-  strongswanConf = {setup, connections, ca, secrets, managePlugins, enabledPlugins}: toFile "strongswan.conf" ''
+  strongswanConf = {setup, connections, ca, secretsFile, managePlugins, enabledPlugins}: toFile "strongswan.conf" ''
     charon {
       ${if managePlugins then "load_modular = no" else ""}
       ${if managePlugins then ("load = " + (concatStringsSep " " enabledPlugins)) else ""}
       plugins {
         stroke {
-          secrets_file = ${ipsecSecrets secrets}
+          secrets_file = ${secretsFile}
         }
       }
     }
@@ -135,7 +135,18 @@ in
     };
   };
 
-  config = with cfg; mkIf enable {
+
+  config = with cfg;
+  let
+    secretsFile = ipsecSecrets cfg.secrets;
+  in
+  mkIf enable
+    {
+
+    # here we should use the default strongswan ipsec.secrets and
+    # append to it (default one is empty so not a pb for now)
+    environment.etc."ipsec.secrets".source = secretsFile;
+
     systemd.services.strongswan = {
       description = "strongSwan IPSec Service";
       wantedBy = [ "multi-user.target" ];
@@ -143,11 +154,15 @@ in
       wants = [ "keys.target" ];
       after = [ "network-online.target" "keys.target" ];
       environment = {
-        STRONGSWAN_CONF = strongswanConf { inherit setup connections ca secrets managePlugins enabledPlugins; };
+        STRONGSWAN_CONF = strongswanConf { inherit setup connections ca secretsFile managePlugins enabledPlugins; };
       };
       serviceConfig = {
         ExecStart  = "${pkgs.strongswan}/sbin/ipsec start --nofork";
       };
+      preStart = ''
+        # with 'nopeerdns' setting, ppp writes into this folder
+        mkdir -m 700 -p /etc/ppp
+      '';
     };
   };
 }

pkgs/tools/networking/network-manager/l2tp.nix

@@ -22,6 +22,9 @@ stdenv.mkDerivation rec {
   postPatch = ''
     sed -i -e 's%"\(/usr/sbin\|/usr/pkg/sbin\|/usr/local/sbin\)/[^"]*",%%g' ./src/nm-l2tp-service.c
 
+    substituteInPlace ./Makefile.am \
+      --replace '$(sysconfdir)/dbus-1/system.d' "$out/etc/dbus-1/system.d"
+
     substituteInPlace ./src/nm-l2tp-service.c \
       --replace /sbin/ipsec  ${strongswan}/bin/ipsec \
       --replace /sbin/xl2tpd ${xl2tpd}/bin/xl2tpd

pkgs/tools/networking/strongswan/default.nix

@@ -76,6 +76,11 @@ stdenv.mkDerivation rec {
          "--enable-sqlite" ]
     ++ optional enableNetworkManager "--enable-nm";
 
+  postInstall = ''
+    # this is needed for l2tp
+    echo "include /etc/ipsec.secrets" >> $out/etc/ipsec.secrets
+  '';
+
   NIX_LDFLAGS = "-lgcc_s" ;
 
   meta = {