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This document describes the Druid security model that extensions use to enable user authentication and authorization services to Druid.
## Authentication and authorization model
At the center of the Druid user authentication and authorization model are _resources_ and _actions_. A resource is something that authenticated users are trying to access or modify. An action is something that users are trying to do.
* SYSTEM_TABLE – when the Broker property `druid.sql.planner.authorizeSystemTablesDirectly` is true, then Druid uses this resource type to authorize the system tables in the `sys` schema in SQL.
* Data users, who only need READ access to DATASOURCE. These users should access Query APIs only through an API gateway. Other APIs and permissions include functionality that should be limited to server admins.
It is important to note that WRITE access to DATASOURCE grants a user broad access. For instance, such users will have access to the Druid file system, S3 buckets, and credentials, among other things. As such, the ability to add and manage datasources should be allocated selectively to administrators.
`WRITE` permission on a resource does not include `READ` permission. If a user requires both `READ` and `WRITE` permissions on a resource, you must grant them both explicitly. For instance, a user with only `DATASOURCE READ` permission
might have access to an API or a system schema record that a user with `DATASOURCE WRITE` permission would not have access to.
If `druid.auth.authenticator.<authenticator-name>.initialAdminPassword` is set, a default admin user named "admin" will be created, with the specified initial password. If this configuration is omitted, the "admin" user will not be created.
If `druid.auth.authenticator.<authenticator-name>.initialInternalClientPassword` is set, a default internal system user named "druid_system" will be created, with the specified initial password. If this configuration is omitted, the "druid_system" user will not be created.
### Authorizer
Each Authorizer will always have a default "admin" and "druid_system" user with full privileges.
## Defining permissions
There are two action types in Druid: READ and WRITE
Resource names for this type are datasource names. Specifying a datasource permission allows the administrator to grant users access to specific datasources.
There are two possible resource names for the "CONFIG" resource type, "CONFIG" and "security". Granting a user access to CONFIG resources allows them to access the following endpoints.
"CONFIG" resource name covers the following endpoints:
|Endpoint|Process Type|
|--------|---------|
|`/druid/coordinator/v1/config`|coordinator|
|`/druid/indexer/v1/worker`|overlord|
|`/druid/indexer/v1/worker/history`|overlord|
|`/druid/worker/v1/disable`|middleManager|
|`/druid/worker/v1/enable`|middleManager|
"security" resource name covers the following endpoint:
There is only one possible resource name for the "STATE" config resource type, "STATE". Granting a user access to STATE resources allows them to access the following endpoints.
"STATE" resource name covers the following endpoints:
Resource names for this type are system schema table names in the `sys` schema in SQL, for example `sys.segments` and `sys.server_segments`. Druid only enforces authorization for `SYSTEM_TABLE` resources when the Broker property `druid.sql.planner.authorizeSystemTablesDirectly` is true.
Queries on [INFORMATION_SCHEMA tables](../querying/sql-metadata-tables.md#information-schema) return information about datasources that the caller has DATASOURCE READ access to. Other
When the Broker property `druid.sql.planner.authorizeSystemTablesDirectly` is true, users also require `SYSTEM_TABLE` authorization on a system schema table to query it.
To prevent excessive load on the Coordinator, the Authenticator and Authorizer user/role Druid metadata store state is cached on each Druid process.
Each process will periodically poll the Coordinator for the latest Druid metadata store state, controlled by the `druid.auth.basic.common.pollingPeriod` and `druid.auth.basic.common.maxRandomDelay` properties.
When a configuration update occurs, the Coordinator can optionally notify each process with the updated Druid metadata store state. This behavior is controlled by the `enableCacheNotifications` and `cacheNotificationTimeout` properties on Authenticators and Authorizers.
Note that because of the caching, changes made to the user/role Druid metadata store may not be immediately reflected at each Druid process.
