OPA is a lightweight general-purpose policy engine that can be co-located with MinIO server, in this document we talk about how to use OPA HTTP API to authorize requests. It can be used with any type of credentials (STS based like OpenID or LDAP, regular IAM users or service accounts).

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

## Get started

### 1. Start OPA in a container

```sh
podman run -it \
    --name opa \

package cmd

import (
	"github.com/minio/minio/internal/auth"
	"github.com/minio/minio/internal/config"
	"github.com/minio/minio/internal/config/compress"
	xldap "github.com/minio/minio/internal/config/identity/ldap"
	"github.com/minio/minio/internal/config/identity/openid"
	"github.com/minio/minio/internal/config/notify"
	"github.com/minio/minio/internal/config/policy/opa"
	"github.com/minio/minio/internal/config/storageclass"

                return Integer.valueOf(-1);
            }
        };
        File file = File.createTempFile("test", ".properties");
        file.deleteOnExit();
        FileUtil.writeBytes(file.getAbsolutePath(), "ldap.security.principal=******@****.***".getBytes("UTF-8"));
        DynamicProperties systemProps = new DynamicProperties(file);
        SingletonLaContainerFactory.getContainer().register(systemProps, "systemProperties");

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.ldap;

import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;

import org.codelibs.fess.helper.SystemHelper;

package main

import (
	"context"
	"flag"
	"fmt"
	"log"
	"net/url"
	"time"

	"github.com/minio/minio-go/v7"
	cr "github.com/minio/minio-go/v7/pkg/credentials"
)

var (
	// LDAP integrated Minio endpoint
	stsEndpoint string

	// token to use with AssumeRoleWithCustomToken
	token string

	// Role ARN to use
	roleArn string

	// Display credentials flag
	displayCreds bool

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.ldap;

import static org.codelibs.core.stream.StreamUtil.stream;

import java.util.Arrays;
import java.util.Hashtable;

import org.apache.commons.lang3.ArrayUtils;
import org.codelibs.core.lang.StringUtil;

		}
		targetGroups = requestorGroups

		// In case of LDAP/OIDC we need to set `opts.claims` to ensure
		// it is associated with the LDAP/OIDC user properly.
		for k, v := range cred.Claims {
			if k == expClaim {
				continue
			}
			opts.claims[k] = v
		}
	} else if globalIAMSys.LDAPConfig.Enabled() {
		// In case of LDAP we need to resolve the targetUser to a DN and
		// query their groups:

  pspEnabled: false

# Disable test pods
testFramework:
  enabled: false

podLabels:
  sidecar.istio.io/inject: "false"

# Demo only, so we will have no authentication
admin:
  existingSecret: ""
ldap:
  existingSecret: true
env:
  GF_SECURITY_ADMIN_USER: "admin"
  GF_SECURITY_ADMIN_PASSWORD: "admin"
  GF_AUTH_BASIC_ENABLED: "false"
  GF_AUTH_ANONYMOUS_ENABLED: "true"
  GF_AUTH_ANONYMOUS_ORG_ROLE: Admin

	if err != nil {
		return "", fmt.Errorf("auth url request err: %v", err)
	}

	// Modify u to choose the ldap option
	u.Path += "/ldap"
	// fmt.Println(u)

	// Pick the LDAP login option. This would return a form page after
	// following some redirects. `lastReq` would be the URL of the form
	// page, where we need to POST (submit) the form.

  ## Add new policies as explained here https://min.io/docs/minio/kubernetes/upstream/administration/identity-access-management.html#access-management
  ## NOTE: this will fail if LDAP is enabled in your MinIO deployment
  ## make sure to disable this if you are using LDAP.
  - accessKey: console
    secretKey: console123
    policy: consoleAdmin
  # Or you can refer to specific secret
  #- accessKey: externalSecret