ipa user-add: add optional objectclass for radius-username

The command "ipa user-add --radius-username" fails with
ipa: ERROR: attribute "ipatokenRadiusUserName" not allowed
because it does not add the objectclass ipatokenradiusproxyuser
that is required by the attribute ipatokenradiususername.

The issue happens with ipa user-add / stageuser-add / user-mod / stageuser-mod.

The fix adds the objectclass when needed in the pre_common_callback method
of baseuser_add and baseuser_mod (ensuring that user and stageuser commands
are fixed).

Fixes https://pagure.io/freeipa/issue/7569

Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>

ipaserver/plugins/baseuser.py

@@ -485,6 +485,9 @@ class baseuser_add(LDAPCreate):
         assert isinstance(dn, DN)
         set_krbcanonicalname(entry_attrs)
         self.obj.convert_usercertificate_pre(entry_attrs)
+        if entry_attrs.get('ipatokenradiususername', None):
+            add_missing_object_class(ldap, u'ipatokenradiusproxyuser', dn,
+                                     entry_attrs, update=False)
 
     def post_common_callback(self, ldap, dn, entry_attrs, *keys, **options):
         assert isinstance(dn, DN)
@@ -573,8 +576,10 @@ class baseuser_mod(LDAPUpdate):
             setattr(context, 'randompassword', entry_attrs['userpassword'])
 
     def check_objectclass(self, ldap, dn, entry_attrs):
-        if ('ipasshpubkey' in entry_attrs or 'ipauserauthtype' in entry_attrs
+        # Some attributes may require additional object classes
-            or 'userclass' in entry_attrs or 'ipatokenradiusconfiglink' in entry_attrs):
+        special_attrs = {'ipasshpubkey', 'ipauserauthtype', 'userclass',
+                         'ipatokenradiusconfiglink', 'ipatokenradiususername'}
+        if special_attrs.intersection(entry_attrs):
             if 'objectclass' in entry_attrs:
                 obj_classes = entry_attrs['objectclass']
             else:
@@ -602,6 +607,15 @@ class baseuser_mod(LDAPUpdate):
                     answer = self.api.Object['radiusproxy'].get_dn_if_exists(cl)
                     entry_attrs['ipatokenradiusconfiglink'] = answer
 
+            # Note: we could have used the method add_missing_object_class
+            # but since the data is already fetched and lowercased in
+            # obj_classes, it is more efficient to use the same approach
+            # as the code right above these lines
+            if 'ipatokenradiususername' in entry_attrs:
+                if 'ipatokenradiusproxyuser' not in obj_classes:
+                    entry_attrs['objectclass'].append(
+                        'ipatokenradiusproxyuser')
+
     def pre_common_callback(self, ldap, dn, entry_attrs, attrs_list, *keys,
                             **options):
         assert isinstance(dn, DN)