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Configuring Leap with OIDC

This topic describes how to configure an HCL Leap server that was deployed using Helm with an OpenID Connect identity provider.

Configuring Leap with OIDC

Leap can be configured to leverage OpenID Connect (OIDC) as the primary authentication mechanism. This means that Leap will be turned into a Relying Party (RP) to the specified identify provider (IDP). When OIDC is used, the user and group lookup feature of Leap is not available and must be disabled as part of the configuration.

The following tasks must be completed to establish this configuration:

  1. Configure the OIDC identity provider.
  2. Create a secret in Kubernetes container from the IDP server certificate.
  3. Add an OIDC definition as a server customization.
  4. Add configuration properties related to the OIDC configuration.
  5. Restart the pod.

Configure OIDC identity Provider

Many different identity providers offer OIDC capability. Refer to your chosen identity provider's documentation for more details on configuration.

Create a secret in Kubernetes container from the IDP certificate

As part of the configuration process for your identify provider, you will have created or obtained a digital certificate for configuring HTTPS. This certificate will also need to be deployed to Leap so that the two servers can communicate with each other.

Note: The SSL certificate (.crt) and public key (.key) should be in PKCS12 format.

After copying the .key and .crt to the kubernetes image, create a secret using the following command:

kubectl -n myns create secret tls oidccert --key="/tmp/oidc.key" --cert="/tmp/oidc.crt"

Next, this secret can be referenced in the yaml file:

configuration:
  leap:
    customCertificateSecrets:
      keycloakCert: "keycloakcert"

For more information, see to Provide admin user a custom secret.

Add OIDC definition as a server customization

The properties that you need to specify may differ based on your identify provider. For additional information, see the Open Liberty documentation on OpenID Connect.

Before moving on from this step:

  • Verify that the discoveryEndpointURL is valid by opening it in a browser prior to entering it in the yaml file.
  • Update the clientSecret with the proper value obtained from your IDP

The following snippet is an example of an OIDC definition:

configOverrideFiles:
      openIdConnect: |
        <server description="leapServer">
          <openidConnectClient id="oidc"
            clientId="hcl-leap-oidc-client"
            clientSecret="clientSecretHash"
            signatureAlgorithm="RS256"
            authFilterRef="interceptedAuthFilter"
            mapIdentityToRegistryUser="false"
            httpsRequired="true"
            scope="openid"
            <!-- Defines a simple name that can be used to refer to this OIDC config -->
            realmName="LeapOidc"
            <!-- The property of the token that contains the user's group assignments -->
              groupIdentifier="group_membership"
            userIdentityToCreateSubject="preferred_username"
            discoveryEndpointUrl="https://myoidcserver:8443/realms/Leapdev/.well-known/openid-configuration">
          </openidConnectClient>
          <authFilter id="interceptedAuthFilter">
            <requestUrl id="authRequestUrl" matchType="contains" urlPattern="/apps/secure|/apps/secured"/>
          </authFilter>
          <httpEndpoint id="defaultHttpEndpoint"
             host="*"
             httpPort="9080"
             httpsPort="9443">
             <samesite none="*" />
        </server>

For more details on defining a server customization, see Open Liberty server customizations.

Add config properties related to OIDC config

The following properties must be set to complete the OIDC configuration:

  • userLookups - By setting this to false it will disable user lookups, which is not available when configured with OIDC.
  • userGroups - By setting this to false it will disable group lookups, which is not available when configured with OIDC.
  • postLogoutRedirectURL - This is the URL to which Leap will redirect the browser after a user chooses to log out. This is necessary to complete the loop with the OIDC IDP.
configuration:
   leap:
     leapProperties: |
       ibm.nitro.NitroConfig.userLookup=false
       ibm.nitro.NitroConfig.userGroups=false 
       ibm.nitro.LogoutServlet.postLogoutRedirectURL=https://myoidcServer.com/realms/Leap/protocol/openid-
                 connect/logout?client_id=hcl-leap-oidc-client&post_logout_redirect_uri=https://myLeapServer.com/apps/secure/org/ide/manager.html

For more details on setting Leap properties, see Leap properties.

Referencing Users and Groups in Security Role Mapping

To assign a user or group from OIDC to one of the Leap roles (AdministrativeUsers, EditApplicationUsers, UseApplicationUsers) you must use their access id. The access id is made up of the realmName (defined in the 'openidConnectClient' definition) and the user/group name.

To assign a user from OIDC to a Leap security role you would use {realmName}/{userName}: 

MappedUsersAccessIDs:
 - LeapOidc/john.oidc

To assign a group from OIDC to a Leap security role you would use {realmName}/{groupName}: 

MappedGroupsAccessIDs:
 - LeapOidc//Group1
Note: there is an extra slash in the group name because that is part of the definition in the IDP used for this example. Other IDPs may differ in how they define the group name, if in doubt leverage the logging trace string to identify the correct value.

Troubleshooting

To get more information about how Liberty perceives the logged in user, add the trace string 'com.ibm.ws.security.authentication.*=all'. This will provide useful information for understanding the user and group values. An example output in the trace.log, after logging in, looks like:

    Principal: WSPrincipal:john.oidc
    Public Credential: com.ibm.ws.security.credentials.wscred.WSCredentialImpl@cb847b2d,realmName=LeapOidc,securityName=john.oidc,realmSecurityName=LeapOidc/john.oidc,uniqueSecurityName=john.oidc,primaryGroupId=null,accessId=user:LeapOidc/john.oidc,groupIds=[group:LeapOidc//Group2]
    Private Credential: IDToken:{"exp":1710363581,"iat":1710363281,"auth_time":1710363280,"jti":"f343b1fe-6a9a-482f-a85e-1cf46f4eb1b8","iss":"https://myoidcserver:8443/realms/Leapdev","aud":"hcl-leap-oidc-client","sub":"9b8cd571-5d09-4de2-ba2d-22b985424831","typ":"ID","azp":"hcl-leap-oidc-client","session_state":"fff63a5e-8269-4e69-b4c3-9d4135c028da","at_hash":"ePO9yDI6IGdX1iDG17CNWQ","acr":"1","sid":"fff63a5e-8269-4e69-b4c3-9d4135c028da","group_membership":["/Group2"],"email_verified":false,"realmName":"Leapdev","name":"John Oidc","groups":["default-roles-leapdev","offline_access","uma_authorization"],"preferred_username":"john.oidc","given_name":"John","family_name":"Oidc","email":"john.oidc@acme.com"}
Note: If the groupIds array is empty then the 'openidConnectClient' is not configured properly; the group claim may be missing from the token or the 'groupIdentifier' may not be set to the correct value.

Restart the pod

After restarting the Leap pod, accessing Leap should redirect you to authenticate using your OIDC IDP.