MinIO now includes support for using an Access Management Plugin. This is to allow object storage access control to be managed externally via a webhook.
When configured, MinIO sends request and credential details for every API call to an external HTTP(S) endpoint and expects an allow/deny response. MinIO is thus able to delegate access management to an external system, and users are able to use a custom solution instead of S3 standard IAM policies.
Latency sensitive applications may notice an increased latency due to a request to the external plugin upon every authenticated request to MinIO. User are advised to provision their infrastructure such that latency and performance is acceptable.
## Quickstart
To easily try out the feature, run the included demo Access Management Plugin program in this directory:
```sh
go run access-manager-plugin.go
```
This program, lets the admin user perform any action and prevents all other users from performing `s3:Put*` operations.
Only the last operation would fail with a permissions error.
## Configuration
Access Management Plugin can be configured with environment variables:
```sh
$ mc admin config set dminio1 policy_plugin --env
KEY:
policy_plugin enable Access Management Plugin for policy enforcement
ARGS:
MINIO_POLICY_PLUGIN_URL* (url) plugin hook endpoint (HTTP(S)) e.g. "http://localhost:8181/v1/data/httpapi/authz/allow"
MINIO_POLICY_PLUGIN_AUTH_TOKEN (string) authorization token for plugin hook endpoint
MINIO_POLICY_PLUGIN_COMMENT (sentence) optionally add a comment to this setting
```
## Request and Response
MinIO will make a `POST` request with a JSON body to the given plugin URL. If the auth token parameter is set, it will be sent as an authorization header.
The JSON body structure can be seen from this sample:
