idviews: handle unqualified ID override lookups from Web UI

First part of the required changes to merge a plugin to manage IPA as
a trusted Active Directory user.

It is not possible to omit ID view in IPA API but a client might specify
empty ID view. Up right now the empty view was considered an error. This
prevented Web UI from resolving ID overrides in a group member adder
dialog.

Default to 'Default Trust View' if the ID view is None or empty string
(''). Do this only for user ID overrides, as we do not support adding
group ID overrides as group members in a plugin to manage IPA as a
trusted Active Directory user[1].

Being a group member means an object in LDAP must have an object class
that allows 'memberOf' attribute because 389-ds 'memberof' plugin will
attempt to link back to the object from the group. Allow use of
'nsMemberOf' object class in ID overrides.

Fixes: https://pagure.io/freeipa/issue/7255

[1] https://github.com/abbra/freeipa-adusers-admins

Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>

ipaserver/plugins/idviews.py

@@ -91,6 +91,28 @@ ANCHOR_REGEX = re.compile(
 )
 
 
+def normalize_idview_name(value):
+    if value in (None, '',):
+        return DEFAULT_TRUST_VIEW_NAME
+    return value
+
+
+def handle_idoverride_memberof(self, ldap, dn, found, not_found,
+                               *keys, **options):
+    if ('idoverrideuser' in options) and ('member' in found):
+        for id in found['member'].get('idoverrideuser', []):
+            try:
+                e = ldap.get_entry(id, ['*'])
+                if not self.obj.has_objectclass(e['objectclass'],
+                                                'nsmemberof'):
+                    add_missing_object_class(ldap, 'nsmemberof',
+                                             id, entry_attrs=e, update=True)
+            except errors.NotFound:
+                # We are not adding an object here, only modifying existing
+                continue
+    return dn
+
+
 @register()
 class idview(LDAPObject):
     """
@@ -113,6 +135,7 @@ class idview(LDAPObject):
             cli_name='name',
             label=_('ID View Name'),
             primary_key=True,
+            normalizer=normalize_idview_name,
         ),
         Str('description?',
             cli_name='desc',
@@ -733,8 +756,12 @@ class baseidoverride(LDAPObject):
                 self.backend,
                 self.override_object,
                 keys[-1],
-                fallback_to_ldap=options['fallback_to_ldap']
+                fallback_to_ldap=options.get('fallback_to_ldap', False)
             )
+            if all([len(keys[:-1]) == 0,
+                    self.override_object == 'user',
+                    anchor.startswith(SID_ANCHOR_PREFIX)]):
+                keys = (DEFAULT_TRUST_VIEW_NAME, ) + keys
 
         keys = keys[:-1] + (anchor, )
         return super(baseidoverride, self).get_dn(*keys, **options)
@@ -810,6 +837,12 @@ class baseidoverride(LDAPObject):
                 rules=ldap.MATCH_ALL
             )
 
+    def get_primary_key_from_dn(self, dn):
+        return resolve_anchor_to_object_name(self.backend,
+                                             self.override_object,
+                                             dn[0].value)
+
+
 
 class baseidoverride_add(LDAPCreate):
     __doc__ = _('Add a new ID override.')
@@ -918,16 +951,18 @@ class idoverrideuser(baseidoverride):
             'ipapermdefaultattr': {
                 'objectClass', 'ipaAnchorUUID', 'uidNumber', 'description',
                 'homeDirectory', 'uid', 'ipaOriginalUid', 'loginShell', 'gecos',
-                'gidNumber', 'ipaSshPubkey', 'usercertificate'
+                'gidNumber', 'ipaSshPubkey', 'usercertificate', 'memberof'
             },
         },
     }
 
     object_class = baseidoverride.object_class + ['ipaUserOverride']
-    possible_objectclasses = ['ipasshuser', 'ipaSshGroupOfPubKeys']
+    possible_objectclasses = ['ipasshuser', 'ipaSshGroupOfPubKeys',
+                              'nsmemberof']
     default_attributes = baseidoverride.default_attributes + [
        'homeDirectory', 'uidNumber', 'uid', 'ipaOriginalUid', 'loginShell',
        'ipaSshPubkey', 'gidNumber', 'gecos', 'usercertificate;binary',
+       'memberofindirect', 'memberof'
     ]
 
     search_display_attributes = baseidoverride.default_attributes + [
@@ -935,6 +970,11 @@ class idoverrideuser(baseidoverride):
        'ipaSshPubkey', 'gidNumber', 'gecos',
     ]
 
+    attribute_members = {
+        'memberof': ['group', 'role'],
+        'memberofindirect': ['group', 'role'],
+    }
+
     takes_params = baseidoverride.takes_params + (
         Str('uid?',
             pattern=PATTERN_GROUPUSER_NAME,