|`druid.escalator.type`|String|Type of the Escalator that should be used for internal Druid communications. This Escalator must use an authentication scheme that is supported by an Authenticator in `druid.auth.authenticatorChain`.|"noop"|no|
|`druid.auth.unsecuredPaths`| List of Strings|List of paths for which security checks will not be performed. All requests to these paths will be allowed.|[]|no|
|`druid.auth.allowUnauthenticatedHttpOptions`|Boolean|If true, allow HTTP OPTIONS requests by unauthenticated users. This is primarily useful for supporting CORS preflight requests, which Druid does not support directly, but which can be enabled using third-party extensions.<br/><br/>Note that you must add "OPTIONS" to `druid.server.http.allowedHttpMethods`.<br/><br/>Also note that disabling authentication checks for OPTIONS requests will allow unauthenticated users to determine what Druid endpoints are valid (by checking if the OPTIONS request returns a 200 instead of 404). Enabling this option will reveal information about server configuration, including information about what extensions are loaded, to unauthenticated users.|false|no|
Authentication decisions are handled by a chain of Authenticator instances. A request will be checked by Authenticators in the sequence defined by the `druid.auth.authenticatorChain`.
For example, the following authenticator chain definition enables the Kerberos and HTTP Basic authenticators, from the `druid-kerberos` and `druid-basic-security` core extensions, respectively:
A request will pass through all Authenticators in the chain, until one of the Authenticators successfully authenticates the request or sends an HTTP error response. Authenticators later in the chain will be skipped after the first successful authentication or if the request is terminated with an error response.
If no Authenticator in the chain successfully authenticated a request or sent an HTTP error response, an HTTP error response will be sent at the end of the chain.
This built-in Authenticator authenticates all requests, and always directs them to an Authorizer named `allowAll`. It's not intended to be used for anything other than the default unsecured configuration.
This built-in Authenticator authenticates all requests, and directs them to an Authorizer specified in the configuration by the user. It is intended to be used for adding a default level of access so
the Anonymous Authenticator should be added to the end of the authenticator chain. A request that reaches the Anonymous Authenticator at the end of the chain will succeed or fail depending on how the Authorizer linked to the Anonymous Authenticator is configured.
This built-in Trusted Domain Authenticator authenticates requests originating from the configured trusted domain, and directs them to an Authorizer specified in the configuration by the user. It is intended to be used for adding a default level of trust and allow access for hosts within same domain.
|`druid.auth.authenticator.<authenticatorName>.domain`|Trusted Domain from which requests should be authenticated. If authentication is allowed for connections from only a given host, fully qualified hostname of that host needs to be specified.|N/A|Yes|
|`druid.auth.authenticator.<authenticatorName>.useForwardedHeaders`|Clients connecting to druid could pass through many layers of proxy. Some proxies also append its own IP address to 'X-Forwarded-For' header before passing on the request to another proxy. Some proxies also connect on behalf of client. If this config is set to true and if 'X-Forwarded-For' is present, trusted domain authenticator will use left most host name from X-Forwarded-For header. Note: It is possible to spoof X-Forwarded-For headers in HTTP requests, enable this with caution.|false|No|
|`druid.auth.authenticator.<authenticatorName>.authorizerName`|Authorizer that requests should be directed to.|N/A|Yes|
|`druid.auth.authenticator.<authenticatorName>.identity`|The identity of the requester.|defaultUser|No|
To use the Trusted Domain Authenticator, add an authenticator with type `trustedDomain` to the authenticatorChain.
For example, the following enables the Trusted Domain Authenticator :
The `druid.escalator.type` property determines what authentication scheme should be used for internal Druid cluster communications (such as when a Broker process communicates with Historical processes for query processing).
The Escalator chosen for this property must use an authentication scheme that is supported by an Authenticator in `druid.auth.authenticatorChain`. Authenticator extension implementers must also provide a corresponding Escalator implementation if they intend to use a particular authentication scheme for internal Druid communications.
When `druid.auth.authenticatorChain` is left empty or unspecified, Druid will create an authenticator chain with a single AllowAll Authenticator named "allowAll".
When an Authenticator successfully authenticates a request, it must attach a AuthenticationResult to the request, containing an information about the identity of the requester, as well as the name of the Authorizer that should authorize the authenticated request.
An Authenticator implementation should provide some means through configuration to allow users to select what Authorizer(s) the Authenticator should route requests to.
### Authenticator and Escalator Internal System User Handling
An Authenticator implementation that is intended to support internal Druid communications must recognize credentials for the "internal system user", as provided by a corresponding Escalator implementation.
These properties provide the authenticator and authorizer names to the implementations as @JsonProperty parameters, potentially useful when multiple authenticators or authorizers of the same type are configured.
