SAML prepare authentication API

Creates a SAML authentication request (<AuthnRequest>) as a URL string, based on the configuration of the respective SAML realm in Elasticsearch.

This API is intended for use by custom web applications other than Kibana. If you are using Kibana, see the Configuring SAML single-sign-on on the Elastic Stack.

Request

POST /_security/saml/prepare

Description

This API returns a URL pointing to the SAML Identity Provider. You can use the URL to redirect the browser of the user in order to continue the authentication process. The URL includes a single parameter named SAMLRequest, which contains a SAML Authentication request that is deflated and Base64 encoded. If the configuration dictates that SAML authentication requests should be signed, the URL has two extra parameters named SigAlg and Signature. These parameters contain the algorithm used for the signature and the signature value itself. It also returns a random string that uniquely identifies this SAML Authentication request. The caller of this API needs to store this identifier as it needs to used in a following step of the authentication process (see SAML authenticate API).

Elasticsearch exposes all the necessary SAML related functionality via the SAML APIs. These APIs are used internally by Kibana in order to provide SAML based authentication, but can also be used by other custom web applications or other clients. See also SAML authenticate API, SAML invalidate API, and SAML logout API.

Request body

acs
(Optional, string) The Assertion Consumer Service URL that matches the one of the SAML realms in Elasticsearch. The realm is used to generate the authentication request. You must specify either this parameter or the realm parameter.
realm
(Optional, string) The name of the SAML realm in Elasticsearch for which the configuration is used to generate the authentication request. You must specify either this parameter or the acs parameter.

Response body

id
(string) A unique identifier for the SAML Request to be stored by the caller of the API.
realm
(string) The name of the Elasticsearch realm that was used to construct the authentication request.
redirect
(string) The URL to redirect the user to.

Examples

The following example generates a SAML authentication request for the SAML realm with name saml1

POST /_security/saml/prepare
{
  "realm" : "saml1"
}

The following example generates a SAML authentication request for the SAML realm with an Assertion Consuming Service URL matching `https://kibana.org/api/security/v1/saml

POST /_security/saml/prepare
{
  "acs" : "https://kibana.org/api/security/v1/saml"
}

This API returns the following response:

{
  "redirect": "https://my-idp.org/login?SAMLRequest=fVJdc6IwFP0rmbwDgUKLGbFDtc462%2B06FX3Yl50rBJsKCZsbrPbXL6J22hdfk%2FNx7zl3eL%2BvK7ITBqVWCfVdRolQuS6k2iR0mU2dmN6Phgh1FTQ8be2rehH%2FWoGWdESF%2FPST0NYorgElcgW1QG5zvkh%2FPfHAZbwx2upcV5SkiMLYzmqsFba1MAthdjIXy5enhL5a23DPOyo6W7kGBa7cwhZ2gO7G8OiW%2BR400kORt0bag7fzezAlk24eqcD2OxxlsNN5O3MdsW9c6CZnbq7rntF4d3s0D7BaHTZhIWN52P%2BcjiuGRbDU6cdj%2BEjJbJLQv4N4ADdhxBiEZbQuWclY4Q8iABbCXczCdSiKMAC%2FgyO2YqbQgrIJDZg%2FcFjsMD%2Fzb3gUcBa5sR%2F9oWR%2BzuJBqlPG14Jbn0DIf2TZ3Jn%2FXmSUrC5ddQB6bob37uZrJdeF4dIDHV3iuhb70Ptq83kOz53ubDLXlcwPJK0q%2FT42AqxIaAkVCkqm2tRgr49yfJGFU%2FZQ3hy3QyuUpd7obPv97kb%2FAQ%3D%3D"}",
  "realm": "saml1",
  "id": "_989a34500a4f5bf0f00d195aa04a7804b4ed42a1"
}