[role="xpack"]
[[security-api-create-cross-cluster-api-key]]
=== Create Cross-Cluster API key API

beta::[]

++++
<titleabbrev>Create Cross-Cluster API key</titleabbrev>
++++

Creates an API key of the `cross_cluster` type for the <<remote-clusters-api-key,API key based remote cluster>> access.
A `cross_cluster` API key cannot be used to authenticate through the REST interface.
On the contrary, a <<security-api-create-api-key,REST API key>> is meant to be used through the REST interface
and cannot be used for the API key based remote cluster access.

[[security-api-create-cross-cluster-api-key-request]]
==== {api-request-title}

`POST /_security/cross_cluster/api_key`

[[security-api-create-cross-cluster-api-key-prereqs]]
==== {api-prereq-title}

* To use this API, you must have at least the `manage_security` cluster privilege.

IMPORTANT: To authenticate this request you must use a credential that is *not* an API key. Even if you use an API key that has the required privilege, the API returns an error.

[[security-api-create-cross-cluster-api-key-desc]]
==== {api-description-title}

Cross-cluster API keys are created by the {es} API key service, which is automatically enabled.
For instructions on disabling the API key service, refer to <<api-key-service-settings>>.

A successful request returns a JSON structure that contains the
API key, its unique ID, and its name. If applicable, it also returns expiration
information for the API key in milliseconds.

NOTE: By default, API keys never expire. You can specify expiration information
when you create the API keys.

Refer to <<api-key-service-settings>> for configuration settings related to API key
service.

Cross-cluster API keys can only be updated with the
<<security-api-update-cross-cluster-api-key,Update Cross-Cluster API key API>>.
Attempting to update them with the <<security-api-update-api-key,Update REST API key API>>
or the <<security-api-bulk-update-api-keys,Bulk Update REST API Keys API>> will result
into an error. They can be retrieved and invalidated using
<<security-api-get-api-key,Get API keys API>>, <<security-api-query-api-key,Query API keys API>>
and <<security-api-invalidate-api-key,Invalidate API keys API>>.


[[security-api-create-cross-cluster-api-key-request-body]]
==== {api-request-body-title}

The following parameters can be specified in the body of a POST request:

`name`::
(Required, string) Specifies the name for this API key.

[[cross-cluster-api-key-access]]
`access`::
(required, object) The access to be granted to this API key. The access is
composed of permissions for cross-cluster search and cross-cluster replication.
At least one of them must be specified.
`search`::: (optional, list) A list of indices permission entries for cross-cluster search.
`names`:::: (required, list) A list of indices or name patterns to which the
permissions in this entry apply.
`field_security`:::: (optional, object) The document fields that the owners of the role have
read access to. For more information, check <<field-and-document-access-control>>.
`query`:::: (optional) A search query that defines the documents the owners of the role have
read access to. A document within the specified indices must match this query to be accessible by the owners of the role. For more information, check
<<field-and-document-access-control>>.
`allow_restricted_indices`:::: (optional, boolean) This needs to be set to `true` (default
is `false`) if the patterns in the `names` field should cover <<system-indices,system indices>>.
`replication`::: (optional, list) A list of indices permission entries for cross-cluster replication.
`names`:::: (required, list) A list of indices or name patterns to which the
permissions in this entry apply.

NOTE: No explicit <<security-privileges,privileges>> should be specified for either search
or replication access. The creation process automatically converts the `access` specification
to a <<api-key-role-descriptors,role descriptor>> which has relevant privileges assigned accordingly.
The `access` value as well as its corresponding `role_descriptors` are returned in responses of
<<security-api-get-api-key,Get API keys API>> and <<security-api-query-api-key,Query API keys API>>.

NOTE: Unlike <<api-key-role-descriptors,REST API keys>>, a cross-cluster API key
does not capture permissions of the authenticated user. The API key's effective
permission is exactly as specified with the `access` parameter.

`expiration`::
(optional, string) Expiration time for the API key. By default, API keys never
expire.

`metadata`::
(optional, object) Arbitrary metadata that you want to associate with the API key.
It supports nested data structure.
Within the `metadata` object, keys beginning with `_` are reserved for
system usage.

[[security-api-create-cross-cluster-api-key-example]]
==== {api-examples-title}

The following example creates a cross-cluster API key:

[source,console]
----
POST /_security/cross_cluster/api_key
{
  "name": "my-cross-cluster-api-key",
  "expiration": "1d",   <1>
  "access": {
    "search": [  <2>
      {
        "names": ["logs*"]
      }
    ],
    "replication": [  <3>
      {
        "names": ["archive*"]
      }
    ]
  },
  "metadata": {
    "description": "phase one",
    "environment": {
       "level": 1,
       "trusted": true,
       "tags": ["dev", "staging"]
    }
  }
}
----
<1> Optional expiration for the API key being generated. If expiration is not
provided then the API key does not expire.
<2> Cross-cluster search access to be granted to the API key.
<3> Cross-cluster replication access to be granted to the API key.

A successful call returns a JSON structure that provides API key information.

[source,console-result]
----
{
  "id": "VuaCfGcBCdbkQm-e5aOx",        <1>
  "name": "my-cross-cluster-api-key",
  "expiration": 1544068612110,         <2>
  "api_key": "ui2lp2axTNmsyakw9tvNnw", <3>
  "encoded": "VnVhQ2ZHY0JDZGJrUW0tZTVhT3g6dWkybHAyYXhUTm1zeWFrdzl0dk5udw=="  <4>
}
----
// TESTRESPONSE[s/VuaCfGcBCdbkQm-e5aOx/$body.id/]
// TESTRESPONSE[s/1544068612110/$body.expiration/]
// TESTRESPONSE[s/ui2lp2axTNmsyakw9tvNnw/$body.api_key/]
// TESTRESPONSE[s/VnVhQ2ZHY0JDZGJrUW0tZTVhT3g6dWkybHAyYXhUTm1zeWFrdzl0dk5udw==/$body.encoded/]
<1> Unique `id` for this API key
<2> Optional expiration in milliseconds for this API key
<3> Generated API key secret
<4> API key credentials which is the Base64-encoding of the UTF-8
representation of the `id` and `api_key` joined by a colon (`:`)

The API key information can be retrieved with the <<security-api-get-api-key,Get API key API>>.

[source,console]
--------------------------------------------------
GET /_security/api_key?id=VuaCfGcBCdbkQm-e5aOx
--------------------------------------------------
// TEST[s/VuaCfGcBCdbkQm-e5aOx/$body.id/]
// TEST[continued]

A successful call returns a JSON structure that contains the information of the API key:

[source,js]
--------------------------------------------------
{
  "api_keys": [
    {
      "id": "VuaCfGcBCdbkQm-e5aOx", <1>
      "name": "my-cross-cluster-api-key", <2>
      "type": "cross_cluster", <3>
      "creation": 1548550550158,
      "expiration": 1548551550158,
      "invalidated": false,
      "username": "myuser",
      "realm": "native1",
      "metadata": {
        "description": "phase one",
          "environment": {
             "level": 1,
             "trusted": true,
             "tags": ["dev", "staging"]
          }
      },
      "role_descriptors": {  <4>
        "cross_cluster": {
          "cluster": [  <5>
              "cross_cluster_search", "cross_cluster_replication"
          ],
          "indices": [
            {  <6>
              "names": [
                "logs*"
              ],
              "privileges": [
                "read", "read_cross_cluster", "view_index_metadata"
              ],
              "allow_restricted_indices": false
            },
            {  <7>
              "names": [
                "archive*"
              ],
              "privileges": [
                "cross_cluster_replication", "cross_cluster_replication_internal"
              ],
              "allow_restricted_indices": false
            }
          ],
          "applications": [ ],
          "run_as": [ ],
          "metadata": { },
          "transient_metadata": {
            "enabled": true
          }
        }
      },
      "access": {  <8>
        "search": [
          {
            "names": [
              "logs*"
            ],
            "allow_restricted_indices": false
          }
        ],
        "replication": [
          {
            "names": [
              "archive*"
            ],
            "allow_restricted_indices": false
          }
        ]
      }
    }
  ]
}
--------------------------------------------------
// NOTCONSOLE
<1> ID for the API key
<2> Name of the API key
<3> Type of the API key
<4> The role descriptors generated for the cross-cluster API key. It always
contains exactly one role descriptor named `cross_cluster`.
A cross-cluster API key has no limited-by role descriptors.
<5> The cluster privileges necessary for the required cross-cluster access.
The value is `cross_cluster_search` if only cross-cluster search is required.
It is `cross_cluster_replication` if only cross-cluster replication is required.
Or both, if search and replication are required.
<6> The indices privileges corresponding to the required cross-cluster search access.
<7> The indices privileges corresponding to the required cross-cluster replication access.
<8> The `access` corresponds to the value specified at API key creation time.


To use the generated API key, configure it as the cluster credential as part of an API key based remote cluster configuration.