
[[_identity_broker_post_login_flow]]
=== Post login flow

Post login flow is useful for the situations when you want to trigger some additional authentication actions after every login with the particular identity provider.
For example, you may want to trigger 2-factor authentication after every login of {project_name} to `Facebook` because `Facebook` does not provide 2-factor authentication during its login.

Once you setup the authentication flow with the needed steps, set it as `Post login flow` when configuring the identity provider.

==== Post login flow examples

===== Requesting 2-factor authentication after identity provider login

The easiest way is to enforce authentication with one particular 2-factor method. For example, when requesting OTP, the flow can look like this with only a single authenticator configured.
This type of flow asks the user to configure the OTP during the first login with the identity provide when the user does not have OTP set on the account.

.2FA post login flow with OTP
image:images/post-login-flow-otp.png[Post login OTP]

The more complex setup can include multiple 2-factor authentication methods configured as `ALTERNATIVE`. In this case, make sure that the user is requested to setup one of
the methods if that user does not yet have any 2-factor authentication configured on the account. This could be done as follows:

* Make sure that one of the 2-factor methods is configured as `REQUIRED` in the <<_identity_broker_first_login, First login flow>>. This method can works if  you expect all your users to be registered by
the identity provider login.

* Wrap the 2-factor methods as `ALTERNATIVE` into a conditional subflow such as one called `2FA` and create another conditional subflow such as one called `OTP if no 2FA`,
which will be triggered only if the previous subflow was not executed and will ask user to add one of the 2-factor methods (for example, OTP). The example of a similar flow configuration is provided
in the <<_conditional-2fa-otp-default, Conditions section of the Authentication flows chapter>>.

==== Requesting additional authentication steps for the dedicated clients

In some cases, a client or group of clients may need to perform some additional steps after identity provider login.
The following is an example of a flow that prescribes that when the client scope `foo` is requested, the user is required to authenticate with the OTP after identity provider login.

.2FA post login flow with client scope and OTP
image:images/post-login-flow-client-scope.png[Post login with client scope and OTP]

This is an example of configuring the `Condition - client scope` for requesting the specified client scope.

.2FA post login flow client scope configuration
image:images/post-login-flow-client-scope-config.png[Post login flow client scope configuration]

The requested clients need to have this client scope set on them either
as default or as optional. In the latter case, the flow is executed only if the client scope is requested by the client (for example, by the `scope` parameter in the case of OIDC/OAuth2 client logins).
