96 lines
4.7 KiB
Text
96 lines
4.7 KiB
Text
[[_authentication-flows]]
|
|
|
|
=== Authentication Flows
|
|
|
|
An _authentication flow_ is a container for all authentications, screens, and actions that must happen during login, registration, and other
|
|
{{book.project.name}} workflows.
|
|
If you go to the admin console `Authentication` left menu item and go to the `Flows` tab, you can view all the defined flows
|
|
in the system and what actions and checks each flow requires. This section does a walk through of the browser login flow. In the
|
|
left drop down list select `browser` to come to the screen shown below:
|
|
|
|
.Browser Flow
|
|
image:../../{{book.images}}/browser-flow.png[]
|
|
|
|
If you hover over the tooltip (the tiny question mark) to the right of the flow selection list, this will describe what the
|
|
flow is and does.
|
|
|
|
The `Auth Type` column is the name of authentication or action that will be executed. If an authentication is indented
|
|
this means it is in a sub-flow and may or may not be executed depending on the behavior of its parent. The `Requirement`
|
|
column is a set of radio buttons which define whether or not the action will execute. Let's describe what each radio
|
|
button means:
|
|
|
|
Required::
|
|
This authentication execution must execute successfully. If the user doesn't have that type of authentication mechanism
|
|
configured and there is a required action associated with that authentication type, then a required action will be attached
|
|
to that account. For example, if you switch `OTP Form` to `Required`, users that don't have an OTP generator configured
|
|
will be asked to do so.
|
|
Optional::
|
|
If the user has the authentication type configured, it will be executed. Otherwise, it will be ignored.
|
|
Disabled::
|
|
If disabled, the authentication type is not executed.
|
|
Alternative::
|
|
This means that at least one alternative authentication type must execute successfully at that level of the flow.
|
|
|
|
This is better described in an example. Let's walk through the `browser` authentication flow.
|
|
|
|
. The first authentication type is `Cookie`. When a user successfully logs in for the first time, a session cookie is set.
|
|
If this cookie has already been set, then this authentication type is successful.
|
|
Since the cookie provider returned success and each execution at this level of the flow is _alternative_, no other execution is executed and this results in a successful login.
|
|
. Next the flow looks at the Kerberos execution. This authenticator is disabled by default and will be skipped.
|
|
. The next execution is a subflow called Forms. Since this subflow is marked as _alternative_ it will not be executed if the `Cookie` authentication type passed.
|
|
This subflow contains additional authentication type that needs to be executed.
|
|
The executions for this subflow are loaded and the same processing logic occurs
|
|
. The first execution in the Forms subflow is the Username Password Form. This authentication type renders the username and password page.
|
|
It is marked as _required_ so the user must enter in a valid username and password.
|
|
. The next execution is the OTP Form.
|
|
This is marked as _optional_. If the user has OTP set up, then this authentication type must run and be successful. If the user doesn't
|
|
have OTP set up, this authentication type is ignored.
|
|
|
|
=== Executions
|
|
|
|
Executions can be used
|
|
|
|
.Script Authenticator
|
|
A _script_ authenticator allows to define custom authentication logic via JavaScript.
|
|
Custom authenticators. Authentication scripts must at least provide one of the following functions:
|
|
`authenticate(..)` which is called from `Authenticator#authenticate(AuthenticationFlowContext)`
|
|
`action(..)` which is called from `Authenticator#action(AuthenticationFlowContext)`
|
|
|
|
Custom `Authenticator`'s should at least provide the `authenticate(..)` function.
|
|
The following script `javax.script.Bindings` are available for convenient use within script code.
|
|
|
|
`script`::
|
|
the `ScriptModel` to access script metadata
|
|
`realm`::
|
|
the `RealmModel`
|
|
`user`::
|
|
the current `UserModel`
|
|
`session`::
|
|
the active `KeycloakSession`
|
|
`httpRequest`::
|
|
the current `org.jboss.resteasy.spi.HttpRequest`
|
|
`LOG`::
|
|
a `org.jboss.logging.Logger` scoped to `ScriptBasedAuthenticator`
|
|
|
|
Note that additional context information can be extracted from the `context` argument passed
|
|
to the `authenticate(context)` `action(context)` function.
|
|
|
|
[source]
|
|
----
|
|
AuthenticationFlowError = Java.type("org.keycloak.authentication.AuthenticationFlowError");
|
|
|
|
function authenticate(context) {
|
|
|
|
LOG.info(script.name + " --> trace auth for: " + user.username);
|
|
|
|
if ( user.username === "tester"
|
|
&& user.getAttribute("someAttribute")
|
|
&& user.getAttribute("someAttribute").contains("someValue")) {
|
|
|
|
context.failure(AuthenticationFlowError.INVALID_USER);
|
|
return;
|
|
}
|
|
|
|
context.success();
|
|
}
|
|
----
|