networkmanager-libreswan: init at 1.2.31

This is a IPsec IKEv1 VPN, Cisco compatible plug-in maintained by the NetworkManager maintainers.
https://gitlab.gnome.org/GNOME/NetworkManager-libreswan

As per https://networkmanager.dev/docs/vpn/ and https://blogs.gnome.org/mcatanzaro/2026/09/15/privilege-escalation-vulnerabilities-in-networkmanager-plugins/
this is a replacement for the insecure and unmaintained NetworkManager-vpnc
but connection profiles have to be recreated and per-option parity has not been checked.

nixos/modules/services/networking/networkmanager.nix

@@ -243,6 +243,7 @@ in
           with pkgs; [
             networkmanager-fortisslvpn
             networkmanager-iodine
+            networkmanager-libreswan
             networkmanager-l2tp
             networkmanager-openconnect
             networkmanager-openvpn

pkgs/by-name/ne/networkmanager-libreswan/fix-paths.patch

@@ -0,0 +1,48 @@
+diff --git a/properties/nm-libreswan-editor-plugin.c b/properties/nm-libreswan-editor-plugin.c
+index 6a178af..787e183 100644
+--- a/properties/nm-libreswan-editor-plugin.c
++++ b/properties/nm-libreswan-editor-plugin.c
+@@ -96,7 +96,7 @@ export_to_file(NMVpnEditorPlugin *self, const char *path, NMConnection *connecti
+ 
+ 	openswan = nm_streq(nm_setting_vpn_get_service_type(s_vpn), NM_VPN_SERVICE_TYPE_OPENSWAN);
+ 
+-	nm_libreswan_detect_version(nm_libreswan_find_helper_bin("ipsec", NULL),
++	nm_libreswan_detect_version("@ipsec@",
+ 	                            &is_openswan,
+ 	                            &version,
+ 	                            NULL);
+diff --git a/src/nm-libreswan-service.c b/src/nm-libreswan-service.c
+index 0458d4e..e0add02 100644
+--- a/src/nm-libreswan-service.c
++++ b/src/nm-libreswan-service.c
+@@ -1820,7 +1820,7 @@ connect_step(NMLibreswanPlugin *self, GError **error)
+ 		if (!priv->openswan) {
+ 			const char *stackman_path;
+ 
+-			stackman_path = nm_libreswan_find_helper_libexec("_stackmanager", error);
++			stackman_path = "@libreswan@/libexec/_stackmanager";
+ 			if (!stackman_path)
+ 				return FALSE;
+ 
+@@ -1977,7 +1977,7 @@ _connect_common(NMVpnServicePlugin *plugin,
+ 		return FALSE;
+ 	}
+ 
+-	priv->ipsec_path = nm_libreswan_find_helper_bin("ipsec", error);
++	priv->ipsec_path = "@ipsec@";
+ 	if (!priv->ipsec_path)
+ 		return FALSE;
+ 
+@@ -1988,10 +1988,10 @@ _connect_common(NMVpnServicePlugin *plugin,
+ 	      priv->openswan ? "Openswan" : "Libreswan");
+ 
+ 	if (!priv->openswan) {
+-		priv->pluto_path = nm_libreswan_find_helper_libexec("pluto", error);
++		priv->pluto_path = "@libreswan@/libexec/pluto";
+ 		if (!priv->pluto_path)
+ 			return FALSE;
+-		priv->whack_path = nm_libreswan_find_helper_libexec("whack", error);
++		priv->whack_path = "@libreswan@/libexec/whack";
+ 		if (!priv->whack_path)
+ 			return FALSE;
+ 	}

pkgs/by-name/ne/networkmanager-libreswan/package.nix

@@ -0,0 +1,85 @@
+{
+  dieHook,
+  fetchpatch,
+  fetchurl,
+  glib,
+  gnome,
+  gtk3,
+  gtk4,
+  intltool,
+  lib,
+  libnl,
+  libnma,
+  libnma-gtk4,
+  libreswan,
+  libsecret,
+  networkmanager,
+  pkg-config,
+  replaceVars,
+  stdenv,
+  withGnome ? true,
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "NetworkManager-libreswan";
+  version = "1.2.31";
+
+  src = fetchurl {
+    url = "mirror://gnome/sources/NetworkManager-libreswan/${lib.versions.majorMinor finalAttrs.version}/NetworkManager-libreswan-${finalAttrs.version}.tar.xz";
+    hash = "sha256-5xq3zWruZoOqlDQusm5hQzv/3y2ml4LsptHCmdzDp28=";
+  };
+
+  patches = [
+    (replaceVars ./fix-paths.patch {
+      ipsec = lib.getExe' libreswan "ipsec";
+      inherit libreswan;
+    })
+  ];
+
+  nativeBuildInputs = [
+    dieHook
+    glib
+    intltool
+    pkg-config
+  ];
+
+  buildInputs = [
+    libnl
+    networkmanager
+  ]
+  ++ lib.optionals withGnome [
+    gtk3
+    gtk4
+    libnma
+    libnma-gtk4
+    libsecret
+  ];
+
+  configureFlags = [
+    "--with-gnome=${lib.boolToYesNo withGnome}"
+    "--with-gtk4=${lib.boolToYesNo withGnome}"
+    "--enable-absolute-paths"
+  ];
+
+  strictDeps = true;
+  __structuredAttrs = true;
+
+  postPatch = ''
+    echo "Ensuring that all helper paths lookups were replaced"
+    ! grep -lr nm_libreswan_find_helper --exclude 'utils.[ch]' || die "^ Found non-replaced helper lookup"
+  '';
+
+  passthru = {
+    updateScript = gnome.updateScript {
+      packageName = "NetworkManager-libreswan";
+      attrPath = "networkmanager-libreswan";
+    };
+    networkManagerPlugin = "VPN/nm-libreswan-service.name";
+  };
+
+  meta = {
+    description = "NetworkManager's libreswan plugin";
+    inherit (networkmanager.meta) maintainers teams platforms;
+    license = lib.licenses.gpl2Plus;
+  };
+})