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Elastic Docs ›X-Pack for the Elastic Stack [5.0] ›Limitations

Limitations

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Limitations

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Plugins

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Elasticsearch’s plugin infrastructure is extremely flexible in terms of what can be extended. While it opens up Elasticsearch to a wide variety of (often custom) additional functionality, when it comes to security, this high extensibility level comes at a cost. We have no control over the third-party plugins' code (open source or not) and therefore we cannot guarantee their compliance with X-Pack security. For this reason, third-party plugins are not officially supported on clusters with X-Pack security enabled.

Changes in Index Wildcard Behavior

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Elasticsearch clusters with X-Pack security enabled apply the /_all wildcard, and all other wildcards, to the indices that the current user has privileges for, not the set of all indices on the cluster. There are two notable results of this behavior:

  • Elasticsearch clusters with X-Pack security enabled do not honor the ignore_unavailable option. This behavior means that requests involving indices that the current user lacks authorization for throw an AuthorizationException error, regardless of the option’s setting.
  • The allow_no_indices option is ignored, resulting in the following behavior: when the final set of indices after wildcard expansion and replacement is empty, the request throws a IndexMissingException error.

As a general principle, core Elasticsearch will return empty results in scenarios where wildcard expansion returns no indices, while Elasticsearch with X-Pack security returns exceptions. Note that this behavior means that operations with multiple items will fail the entire set of operations if any one operation throws an exception due to wildcard expansion resulting in an empty set of authorized indices.

Filtered Index Aliases

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Aliases containing filters are not a secure way to restrict access to individual documents, due to the limitations described in Index and Field Names Can Be Leaked When Using Aliases. X-Pack security provides a secure way to restrict access to documents through the document-level security feature.

Field and Document Level Security Limitations

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When a user’s role enables document or field level security for an index:

  • The user cannot perform write operations:

    • The update API isn’t supported.
    • Update requests included in bulk requests aren’t supported.
  • The request cache is disabled for search requests.

When a user’s role enables document level security for an index:

  • Document level security isn’t applied for APIs that aren’t document based. An example is the field stats API.
  • Document level security doesn’t affect global index statistics that relevancy scoring uses. So this means that scores are computed without taking the role query into account. Note that documents not matching with the role query are never returned.
  • The has_child and has_parent queries aren’t supported as query in the role definition. The has_child and has_parent queries can be used in the search API with document level security enabled.

  • Any query that makes remote calls to fetch data to query by isn’t supported. The following queries aren’t supported:

    • The terms query with terms lookup isn’t supported.
    • The geo_shape query with indexed shapes isn’t supported.
    • The percolate query isn’t supported.

Index and Field Names Can Be Leaked When Using Aliases

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Calling certain Elasticsearch APIs on an alias can potentially leak information about indices that the user isn’t authorized to access. For example, when you get the mappings for an alias with the _mapping API, the response includes the index name and mappings for each index that the alias applies to. Similarly, the response to a _field_stats request includes the name of the underlying index, rather than the alias name.

Until this limitation is addressed, avoid index and field names that contain confidential or sensitive information.

LDAP Realm

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The LDAP Realm does not currently support the discovery of nested LDAP Groups. For example, if a user is a member of group_1 and group_1 is a member of group_2, only group_1 will be discovered. However, the Active Directory Realm does support transitive group membership.

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