FAPI Demo

This is the example application to demonstrate Keycloak FAPI 1 support. It requires to:

• Run and setup Keycloak server on your laptop
• Run Wildfly server on your laptop with this application deployed

Warning

This application is for demonstration purposes with Keycloak integration. It is not proper implementation of FAPI relying party and does not do all the verifications prescribed for the client application in the FAPI specifications:

• https://openid.net/specs/openid-financial-api-part-1-1_0.html#public-client
• https://openid.net/specs/openid-financial-api-part-2-1_0.html#confidential-client

Pre-requisites

This demo assumes Keycloak running on https://as.keycloak-fapi.org:8443 and application running on https://app.keycloak-fapi.org:8543. In order to have both running on your laptop, you may need to ensure that these servers are bound to your host.

On linux, the easiest is to edit /etc/hosts file and add the host similar to this

127.0.0.1 as.keycloak-fapi.org app.keycloak-fapi.org

Build this project

From the root of this project, run:

mvn clean install

This is tested with OpenJDK 8 and Maven 3.6.3

Start and prepare keycloak

This was tested with OpenJDK 8 and Keycloak 18.0.0 legacy distribution based on Wildfly. ( NOTE: Contribution welcome to replace this with Keycloak + Quarkus based dist. )

1. Download Keycloak legacy (Wildfly based distribution), unzip on your laptop. Will be referred as KEYCLOAK_HOME in next steps:

2. Copy keystore + truststore to the distribution:

cp keystores/keycloak.* $KEYCLOAK_HOME/standalone/configuration

3. Configure $KEYCLOAK_HOME/standalone/configuration/standalone.xml for use keystore and truststore from above and logging ( NOTE: Contribution welcome to replace this with JBoss CLI)

3.a) In the logging subsystem section add this to see advanced logging from client policies:

<logger category="org.keycloak.services.clientpolicy">
    <level name="TRACE"/>
</logger>

3.b) In the elytron subsystem in tls -> keystores part add this:

<key-store name="httpsKS">
    <credential-reference clear-text="secret"/>
    <implementation type="JKS"/>
    <file path="keycloak.jks" relative-to="jboss.server.config.dir"/>
</key-store>
<key-store name="twoWayTS">
    <credential-reference clear-text="secret"/>
    <implementation type="JKS"/>
    <file path="keycloak.truststore" relative-to="jboss.server.config.dir"/>
</key-store>

3.c) In the tls -> key-managers part add this:

<key-manager name="httpsKM" key-store="httpsKS">
    <credential-reference clear-text="secret"/>
</key-manager>

3.d) Add new trust-managers part under tls element:

<trust-managers>
    <trust-manager name="twoWayTM" key-store="twoWayTS"/>
</trust-managers>

3.e) Finally under tls -> server-ssl-contexts add this:

<server-ssl-context name="httpsSSC" protocols="TLSv1.2" want-client-auth="true" key-manager="httpsKM" trust-manager="twoWayTM"
    cipher-suite-filter="TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,TLS_DHE_RSA_WITH_AES_256_GCM_SHA384"/>

3.f In the undertow subsystem in the server element, comment the default https-listener and replace with this one:

<https-listener name="https" socket-binding="https" ssl-context="httpsSSC"/>

4. Run the server:

cd $KEYCLOAK_HOME/bin
./standalone.sh -b as.keycloak-fapi.org

5. Create and configure new realm

5.a) Go to https://as.keycloak-fapi.org:8443/auth/, create admin account, login to admin console

5.b) Create realm test and some user in it

5.c) Under Client Registration -> Initial Access Tokens create new initial access token and copy it somewhere for the later use in the demo

Start example app and deploy the example

1. Unzip Wildlfy 23.0.2 to some directory. Will be referred as $APP_HOME

2. Copy keystore and truststore:

cp keystores/keycloak.truststore $APP_HOME/standalone/configuration/
cp keystores/client.jks $APP_HOME/standalone/configuration/

3. Deploy the application:

cp target/fapi-demo.war $APP_HOME/standalone/deployments/

3. Start the wildfly server:

cd $APP_HOME/bin
./standalone.sh -b app.keycloak-fapi.org -Djboss.socket.binding.port-offset=100

Demo

1. Go to https://app.keycloak-fapi.org:8543/fapi-demo

2. No FAPI yet

2.a) In the Client Registration part, you can provide Initial access token from Keycloak (See above) and register some client

2.b) You can click Create Login URL and click Login . After user authentication, you can be redirected back to the application. No FAPI is involved yet. You can see that tokens don't have nonce claim in it.

3. Fapi Baseline test

3.a) In the Keycloak admin console, in Client Policies, you can create create client policy with any-client condition and link with the built-in fapi-1-baseline profile.

3.b) Now in the application, you can register new client. You can doublecheck in the Keycloak admin console, that it has Consent Required switched to ON

3.c) You can create login URL and login with new client. Note that to pass fapi-1-baseline, it is needed to check Use Nonce param and Use PKCE. Otherwise, Keycloak won't allow login.

3.d) Authentication requires user to consent. After authentication, check that tokens have nonce claim (Ideally you should check that it matches with the nonce sent in the initial request)

4. Fapi advanced test

4.a) Change client policy from above to use fapi-1-advanced instead of baseline.

4.b) Register new client. It must be checked both checkboxes Confidential client and Generate client keys

4.c) Create login URL. It must be checked with both Use nonce and Use Request Object to send stuff in signed request object.

4.d) After authentication, you can check by Show Last Tokens that access token has hash of it's certificate, due Keycloak used Sender Constrained access token required by the specs.

Contributions

Anyone is welcome to use this demo according with the licence and feel free to use it in your own presentations for FAPI. Contributions are welcome (See above for potential contributions tips and also search for TODO: in the code :-) )

Slides

See slides from devconf 2022 presentation in file Keycloak FAPI slides.