Validate attributes in permission-add

When adding or modifying permission with both type and attributes
specified, check whether the attributes are allowed for specified type.
In case of disallowed attributes raises the ObjectclassViolation
exception.

New tests were also added to the unit-tests.

https://fedorahosted.org/freeipa/ticket/2293

ipalib/plugins/permission.py

@@ -23,6 +23,7 @@ from ipalib import api, _, ngettext
 from ipalib import Flag, Str, StrEnum
 from ipalib.request import context
 from ipalib import errors
+from ipalib.dn import DN
 
 __doc__ = _("""
 Permissions
@@ -89,6 +90,43 @@ output_params = (
     ),
 )
 
+dn_ipaconfig = str(DN('cn=ipaconfig,cn=etc,%s' % api.env.basedn))
+
+def check_attrs(attrs, type):
+    # Trying to delete attributes - no need for validation
+    if attrs is None:
+        return True
+    allowed_objcls=[]
+    disallowed_objcls=[]
+    obj=api.Object[type]
+
+    if obj.object_class_config:
+        (dn,objcls)=api.Backend.ldap2.get_entry(
+            dn_ipaconfig,[obj.object_class_config]
+            )
+        allowed_objcls=objcls[obj.object_class_config]
+    else:
+        allowed_objcls=obj.object_class
+    if obj.possible_objectclasses:
+        allowed_objcls+=obj.possible_objectclasses
+    if obj.disallow_object_classes:
+        disallowed_objcls=obj.disallow_object_classes
+
+    allowed_attrs=[]
+    disallowed_attrs=[]
+    if allowed_objcls:
+        allowed_attrs=api.Backend.ldap2.get_allowed_attributes(allowed_objcls)
+    if disallowed_objcls:
+        disallowed_attrs=api.Backend.ldap2.get_allowed_attributes(disallowed_objcls)
+    failed_attrs=[]
+    for attr in attrs:
+        if (attr not in allowed_attrs) or (attr in disallowed_attrs):
+            failed_attrs.append(attr)
+    if failed_attrs:
+        raise errors.ObjectclassViolation(info='attribute(s) \"%s\" not allowed' % ','.join(failed_attrs))
+    return True
+
+
 class permission(LDAPObject):
     """
     Permission object.
@@ -192,6 +230,8 @@ class permission_add(LDAPCreate):
         opts['permission'] = keys[-1]
         opts['aciprefix'] = ACI_PREFIX
         try:
+            if 'type' in entry_attrs and 'attrs' in entry_attrs:
+                check_attrs(entry_attrs['attrs'],entry_attrs['type'])
             self.api.Command.aci_add(keys[-1], **opts)
         except Exception, e:
             raise e
@@ -273,6 +313,21 @@ class permission_mod(LDAPUpdate):
         except errors.NotFound:
             self.obj.handle_not_found(*keys)
 
+        # check the correctness of attributes only when the type is specified
+        type=None
+        attrs_to_check=[]
+        current_values=self.api.Command.permission_show(attrs['cn'][0])['result']
+        if 'type' in entry_attrs:
+            type = entry_attrs['type']
+        elif 'type' in current_values:
+            type = current_values['type']
+        if 'attrs' in entry_attrs:
+            attrs_to_check = entry_attrs['attrs']
+        elif 'attrs' in current_values:
+            attrs_to_check = current_values['attrs']
+        if attrs_to_check and type is not None:
+            check_attrs(attrs_to_check,type)
+
         # when renaming permission, check if the target permission does not
         # exists already. Then, make changes to underlying ACI
         if 'rename' in options:

tests/test_xmlrpc/test_permission_plugin.py

@@ -123,6 +123,71 @@ class test_permission(Declarative):
         ),
 
 
+        dict(
+            desc='Try to create %r with invalid attribute \'ipaclientversion\'' % permission2,
+            command=(
+                'permission_add', [permission2], dict(
+                     type=u'user',
+                     permissions=u'write',
+                     attrs=u'ipaclientversion',
+                ),
+            ),
+            expected=errors.ObjectclassViolation(info=u'attribute(s) \"ipaclientversion\" not allowed'),
+        ),
+
+
+        dict(
+            desc='Add allowed attribute \'cn\' to %r' % permission1,
+            command=(
+                'permission_mod', [permission1], dict(
+                     attrs=u'cn',
+                )
+            ),
+            expected=dict(
+                value=permission1,
+                summary=u'Modified permission "%s"' % permission1,
+                result=dict(
+                    dn=lambda x: DN(x) == permission1_dn,
+                    cn=[permission1],
+                    type=u'user',
+                    permissions=[u'write'],
+                    attrs=[u'cn'],
+                ),
+            ),
+        ),
+
+
+        dict(
+            desc='Try to modify %r with invalid attribute \'ipaclientversion\'' % permission1,
+            command=(
+                'permission_mod', [permission1], dict(
+                     attrs=u'ipaclientversion',
+                ),
+            ),
+            expected=errors.ObjectclassViolation(info=u'attribute(s) \"ipaclientversion\" not allowed'),
+        ),
+
+
+        dict(
+            desc='Unset attribute \'cn\' of %r' % permission1,
+            command=(
+                'permission_mod', [permission1], dict(
+                     attrs=None,
+                )
+            ),
+            expected=dict(
+                value=permission1,
+                summary=u'Modified permission "%s"' % permission1,
+                result=dict(
+                    dn=lambda x: DN(x) == permission1_dn,
+                    cn=[permission1],
+                    type=u'user',
+                    permissions=[u'write'],
+                ),
+            ),
+        ),
+
+
         dict(
             desc='Create %r' % privilege1,
             command=('privilege_add', [privilege1],