| *Required*    | *No*                                               |

### Policy

	// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRoleWithWebIdentity.html
	// The plain text that you use for both inline and managed session
	// policies shouldn't exceed 2048 characters.
	if len(sessionPolicyStr) > 2048 {
		writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("Session policy should not exceed 2048 characters"))
		return
	}

	if len(sessionPolicyStr) > 0 {

- On finding at least one associated policy, MinIO generates temporary credentials for the user storing the list of groups in a cryptographically secure session token. The temporary access key, secret key and session token are returned to the user.
- The user can now use these credentials to make requests to the MinIO server.

	AuthEndpoint                     string   `json:"authorization_endpoint,omitempty"`
	TokenEndpoint                    string   `json:"token_endpoint,omitempty"`
	EndSessionEndpoint               string   `json:"end_session_endpoint,omitempty"`
	UserInfoEndpoint                 string   `json:"userinfo_endpoint,omitempty"`
	RevocationEndpoint               string   `json:"revocation_endpoint,omitempty"`

	c.Assert(infoResp.ImpliedPolicy, true)
}

// This test assumes that the policy for `accessKey` allows listing on the given
// bucket. It creates a session policy that restricts listing on the bucket and
// then enables it again in a session policy update call.
func (c *check) assertSvcAccSessionPolicyUpdate(ctx context.Context, s *TestSuiteIAM, madmClient *madmin.AdminClient, accessKey, bucket string) {
	c.Helper()

```
Spark context Web UI available at http://172.26.236.247:4041
Spark context available as 'sc' (master = yarn, app id = application_1490217230866_0002).
Spark session available as 'spark'.
Welcome to


      ____              __
     / __/__  ___ _____/ /__
    _\ \/ _ \/ _ `/ __/  '_/
   /___/ .__/\_,_/_/ /_/\_\   version 2.1.0.2.6.0.0-598
      /_/

	bucket: BUCKET
	prefix: PREFIX
	# NOTE: if source is remote then target must be "local"
	# endpoint: ENDPOINT
	# credentials:
	#   accessKey: ACCESS-KEY
	#   secretKey: SECRET-KEY
	#   sessionToken: SESSION-TOKEN # Available when rotating credentials are used

  # target where the objects must be replicated
  target:
	type: TYPE # valid values are "minio"
	bucket: BUCKET
	prefix: PREFIX

var errInvalidMaxParts = errors.New("Part number is greater than the maximum allowed 10000 parts")

// error returned for session policies > 2048

	EnvRootDiskThresholdSize      = "MINIO_ROOTDISK_THRESHOLD_SIZE" // Deprecated Sep 2023
	EnvBrowserLoginAnimation      = "MINIO_BROWSER_LOGIN_ANIMATION"
	EnvBrowserSessionDuration     = "MINIO_BROWSER_SESSION_DURATION" // Deprecated after November 2023
	EnvMinioStsDuration           = "MINIO_STS_DURATION"
	EnvMinIOLogQueryURL           = "MINIO_LOG_QUERY_URL"
	EnvMinIOLogQueryAuthToken     = "MINIO_LOG_QUERY_AUTH_TOKEN"

</AssumeRoleWithCertificateResponse>
```

## Authentication Flow

A client can request temp. S3 credentials via the STS API. It can authenticate via a client certificate and obtain a access/secret key pair as well as a session token. These credentials are associated to an S3 policy at the MinIO server.