T6599: ipsec: fix incorect default behavior for dead-peer-detection

(cherry picked from commit 23a3419d512139650cfe3dc76759b370b0c0c3d6)

2 files changed, 24 insertions, 1 deletions

diff --git a/smoketest/scripts/cli/test_vpn_ipsec.py b/smoketest/scripts/cli/test_vpn_ipsec.py
index 515e55ee4..2dc66485b 100755
--- a/smoketest/scripts/cli/test_vpn_ipsec.py
+++ b/smoketest/scripts/cli/test_vpn_ipsec.py
@@ -252,6 +252,15 @@ class TestVPNIPsec(VyOSUnitTestSHIM.TestCase):
         for line in swanctl_conf_lines:
             self.assertIn(line, swanctl_conf)
 
+        # if dpd is not specified it should not be enabled (see T6599)
+        swanctl_unexpected_lines = [
+            f'dpd_timeout'
+            f'dpd_delay'
+        ]
+
+        for unexpected_line in swanctl_unexpected_lines:
+            self.assertNotIn(unexpected_line, swanctl_conf)
+
         swanctl_secrets_lines = [
             f'id-{regex_uuid4} = "{local_id}"',
             f'id-{regex_uuid4} = "{remote_id}"',
diff --git a/src/conf_mode/vpn_ipsec.py b/src/conf_mode/vpn_ipsec.py
index dc78c755e..cf82b767f 100755
--- a/src/conf_mode/vpn_ipsec.py
+++ b/src/conf_mode/vpn_ipsec.py
@@ -24,6 +24,7 @@ from time import sleep
 
 from vyos.base import Warning
 from vyos.config import Config
+from vyos.config import config_dict_merge
 from vyos.configdep import set_dependents
 from vyos.configdep import call_dependents
 from vyos.configdict import leaf_node_changed
@@ -86,9 +87,22 @@ def get_config(config=None):
     ipsec = conf.get_config_dict(base, key_mangling=('-', '_'),
                                  no_tag_node_value_mangle=True,
                                  get_first_key=True,
-                                 with_recursive_defaults=True,
                                  with_pki=True)
 
+    # We have to cleanup the default dict, as default values could
+    # enable features which are not explicitly enabled on the
+    # CLI. E.g. dead-peer-detection defaults should not be injected
+    # unless the feature is explicitly opted in to by setting the
+    # top-level node
+    default_values = conf.get_config_defaults(**ipsec.kwargs, recursive=True)
+
+    if 'ike_group' in ipsec:
+        for name, ike in ipsec['ike_group'].items():
+            if 'dead_peer_detection' not in ike:
+                del default_values['ike_group'][name]['dead_peer_detection']
+
+    ipsec = config_dict_merge(default_values, ipsec)
+
     ipsec['dhcp_interfaces'] = set()
     ipsec['dhcp_no_address'] = {}
     ipsec['install_routes'] = 'no' if conf.exists(base + ["options", "disable-route-autoinstall"]) else default_install_routes