The MinIO Security Token Service (STS) AssumeRoleWithLDAPIdentity API endpoint generates temporary access credentials using Active Directory or LDAP user credentials. This page documents the MinIO server AssumeRoleWithLDAPIdentity endpoint. For instructions on implementing STS using an S3-compatible SDK, defer to the documentation for that SDK.

The MinIO STS AssumeRoleWithLDAPIdentity API endpoint is modeled after the AWS AssumeRoleWithWebIdentity endpoint and shares certain request/response elements. This page documents the MinIO-specific syntax and links out to the AWS reference for all shared elements.

Request Endpoint

The AssumeRoleWithLDAPIdentity endpoint has the following form:


The following example uses all supported arguments. Replace the hostname with the appropriate URL for your MinIO cluster:


Request Query Parameters

This endpoint supports the following query parameters:







Specify the username of the AD/LDAP user as whom you want to authenticate.




Specify the password for the LDAPUsername.




Specify 2011-06-15.




Specify the number of seconds after which the temporary credentials expire. Defaults to 3600.

  • The minimum value is 900 or 15 minutes.

  • The maximum value is 604800 or 7 days.

If DurationSeconds is omitted, MinIO checks the JWT token for an exp claim before using the default duration. See RFC 7519 4.1.4: Expiration Time Claim for more information on JSON web token expiration.




Specify the URL-encoded JSON-formatted policy to use as an inline session policy.

  • The minimum string length is 1.

  • The maximum string length is 2048.

The resulting permissions for the temporary credentials are the intersection between the policy matching the Distinguished Name (DN) of the LDAPUsername and the specified inline policy. Applications can only perform those operations for which they are explicitly authorized.

The inline policy can specify a subset of permissions allowed by the policy specified in the DN policy. Applications can never assume more privileges than those specified in the DN policy.

Omit to use only the DN policy.

See Access Management for more information on MinIO authentication and authorization.

Response Elements

The XML response for this API endpoint is similar to the AWS AssumeRoleWithLDAPIdentity response. Specifically, MinIO returns an AssumeRoleWithLDAPIdentityResult object, where the AssumedRoleUser.Credentials object contains the temporary credentials generated by MinIO:

  • AccessKeyId - The access key applications use for authentication.

  • SecretKeyId - The secret key applications use for authentication.

  • Expiration - The ISO-8601 date-time after which the credentials expire.

  • SessionToken - The session token applications use for authentication. Some SDKs may require this field when using temporary credentials.

The following example is similar to the response returned by the MinIO STS AssumeRoleWithLDAPIdentity endpoint:

<?xml version="1.0" encoding="UTF-8"?>
<AssumeRoleWithLDAPIdentityResponse xmlns="">

Error Elements

The XML error response for this API endpoint is similar to the AWS AssumeRoleWithLDAPIdentity response.