OPA is enabled through MinIO's Access Management Plugin feature.

## Get started

### 1. Start OPA in a container

```sh
podman run -it \
    --name opa \
    --publish 8181:8181 \

pid=$!

mc ready myminio

mc admin user add myminio/ minio123 minio123

mc admin policy create myminio/ deny-non-sse-kms-pol ./docs/iam/policies/deny-non-sse-kms-objects.json
mc admin policy create myminio/ deny-invalid-sse-kms-pol ./docs/iam/policies/deny-objects-with-invalid-sse-kms-key-id.json

mc admin policy attach myminio deny-non-sse-kms-pol --user minio123

		return nil, errors.New("no bucket name was provided")
	}

	// Credentials initialization
	var creds *credentials.Credentials
	switch {
	case conf.AWSRole:
		creds = credentials.New(&credentials.IAM{
			Client: &http.Client{
				Transport: NewHTTPTransport(),
			},
		})
	case conf.AWSRoleWebIdentityTokenFile != "" && conf.AWSRoleARN != "":
		sessionName := conf.AWSRoleSessionName
		if sessionName == "" {

	logger.LogOnceIf(ctx, "iam", err, id, errKind...)
}

func iamLogIf(ctx context.Context, err error, errKind ...any) {
	if !errors.Is(err, grid.ErrDisconnected) {
		logger.LogIf(ctx, "iam", err, errKind...)
	}
}

func iamLogEvent(ctx context.Context, msg string, args ...any) {
	logger.Event(ctx, "iam", msg, args...)
}

//   - Handover of IAM & STS Endpoints instead of manual definition in Veeam Backup & Replication. This allows Veeam
//     Agents to directly backup to object storage.
//
// An object storage system can implement one, multiple, or all functions.
//
//   - Optional (mandatory if <IAMSTS> is true): Set Endpoints for IAM and STS processing.
//

# AssumeRoleWithCustomToken [![Slack](https://slack.min.io/slack?type=svg)](https://slack.min.io)

## Introduction

To integrate with custom authentication methods using the [Identity Management Plugin](../iam/identity-management-plugin.md)), MinIO provides an STS API extension called `AssumeRoleWithCustomToken`.

After configuring the plugin, use the generated Role ARN with `AssumeRoleWithCustomToken` to get temporary credentials to access object storage.

	// The ARN of the temporary security credentials that are returned from the
	// AssumeRole action. For more information about ARNs and how to use them in
	// policies, see IAM Identifiers (http://docs.aws.amazon.com/IAM/latest/UserGuide/reference_identifiers.html)
	// in Using IAM.
	//
	// Arn is a required field
	Arn string

	// A unique identifier that contains the role ID and the role session name of

  unencrypted FTP communication (Not-recommended)

## Scope

- All IAM Credentials are allowed access excluding rotating credentials, rotating credentials
  are not allowed to login via FTP/SFTP ports, you must use S3 API port for if you are using
  rotating credentials.

- Access to bucket(s) and object(s) are governed via IAM policies associated with the incoming
  login credentials.

			Sensitive:   true,
			Type:        "string",
			Secret:      true,
		},
		config.HelpKV{
			Key:         RolePolicy,
			Description: `Set the IAM access policies applicable to this client application and IDP e.g. "app-bucket-write,app-bucket-list"` + defaultHelpPostfix(RolePolicy),
			Optional:    true,
			Type:        "string",
		},
		config.HelpKV{

	if len(valSet) > 1 {
		// mismatch - one or more sites has differing tags/policy
		return false
	}
	return true
}

// isIAMPolicyReplicated returns true if count of replicated IAM policies matches total
// number of sites and IAM policies are identical.
func isIAMPolicyReplicated(cntReplicated, total int, policies []*policy.Policy) bool {
	if cntReplicated > 0 && cntReplicated != total {
		return false
	}