bundles/rspamd: refine auto-generation of dkim signing keys

bundles/rspamd/files/dkim.conf

@@ -1,4 +1,4 @@
-# TODO
 path = "/var/lib/rspamd/dkim/$selector.key";
+# selector = "${node.metadata['rspamd']['dkim']}";
 selector = "2019";
 allow_username_mismatch = true;

bundles/rspamd/items.py

@@ -20,6 +20,11 @@ directories = {
             'svc_systemd:rspamd:restart',
         },
     },
+    '/var/lib/rspamd/dkim': {
+        'owner': '_rspamd',
+        'group': '_rspamd',
+        'mode': '0750',
+    },
 }
 
 svc_systemd = {
@@ -51,8 +56,17 @@ files = {
     },
 }
 
+actions = {
+    'rspamd_assure_dkim_key_permissions': {
+        'command': 'chown _rspamd:_rspamd /var/lib/rspamd/dkim/*.key',
+        'needs': {
+            'directory:/var/lib/rspamd/dkim',
+        },
+    },
+}
+
 # TODO manage this using bundlewrap
-if node.metadata.get('rspamd', {}).get('dkim', False):
+if 'dkim' in node.metadata.get('rspamd', {}):
     for i in {'arc', 'dkim_signing'}:
         files[f'/etc/rspamd/local.d/{i}.conf'] = {
             'source': 'dkim.conf',
@@ -65,10 +79,14 @@ if node.metadata.get('rspamd', {}).get('dkim', False):
             },
         }
 
-    actions = {
+    actions['rspamd_generate_dkim_key'] = {
-        'rspamd_generate_dkim_key': {
         'command': node.metadata['rspamd']['dkim'].format_into('cd /var/lib/rspamd/dkim && /usr/bin/rspamadm dkim_keygen -s "{fault}" -b 2048 -k "{fault}.key" > "{fault}.txt"'),
         'unless': node.metadata['rspamd']['dkim'].format_into('test -f "/var/lib/rspamd/dkim/{fault}.key"'),
+        'needs': {
+            'directory:/var/lib/rspamd/dkim',
+        },
+        'needed_by': {
+            'action:rspamd_assure_dkim_key_permissions',
         },
     }