Interception Scripts#

Overview#

Interception scripts allow the Gluu Server to support unique requirements for many aspects of a central authentication and authorization service. Interception scripts can be written in Jython. Jython was chosen because an interpreted language facilitates dynamic creation of business logic, and makes it easier to distribute this logic to a cluster of Gluu servers. Jython enables developers to use either Java or Python classes. Combined with the option of calling web services from Python or Java, this enables the Gluu Server to support any business-driven policy requirement.

The web interface for Custom Scripts can be accessed by navigating to Configuration > Manage Custom Scritps.

Interception Script Methods#

There are three methods that inherit a base interface

Inherited Methods	Method description
`def init(self, configurationAttributes)`	This method is only called once during the script initialization. It can be used for global script initialization, initiate objects etc
`def destroy(self, configurationAttributes)`	This method is called once to destroy events. It can be used to free resource and objects created in the `init()` method
`def getApiVersion(self)`	The `getApiVersion` method allows API changes in order to do transparent migration from an old script to a new API. Currently all scripts should return `1`

The configurationAttributes parameter is java.util.Map<String, SimpleCustomProperty> with properties specified in oxConfigurationProperty attributes.

The script manager only loads enabled scripts. Hence, after enabling or disabling a script, the script manager should trigger an event to either load or destroy a script, respectively. All scripts are stored in LDAP in the ou=scripts,o=<org_inum>,o=gluu branch.

Here is a sample entry:

    dn: inum=@!1111!031C.4A65,ou=scripts,o=@!1111,o=gluu
    objectClass: oxCustomScript
    objectClass: top
    description: <custom_script_description>
    displayName: <display_name>
    gluuStatus: true
    inum: @!1111!031C.4A65
    oxLevel: <priority>
    oxModuleProperty: {"value1":"module_property_name","value2":"module_property_value","description":""}
    oxConfigurationProperty: {"value1":"configuration_property_name","value2":"configuration_property_value","description":""}
    oxRevision: <revision>
    oxScript: <custom_script>
    oxScriptType: <script_type>
    programmingLanguage: python

The script manager reloads scripts automatically without needing to restart the application once oxRevision is increased.

Interception Script Logs#

The log files regarding interception scripts are stored in the oxauth.log file. The logs are separated according to the module they affect. The oxAuth custom script logs are stored in oxauth_script.log and the oxTrust custom script logs are stored in the oxtrust_script.log. Please refer to these log files to troubleshoot errors in the interception scripts or following the workflow of the script.

Note

A print statement may not work on some environments if the PYTHON_HOME environment variable is not set. Make sure it points to a valid python installation.

More details on Logs can be found in Log Management

Person Authentication#

For a list of pre-written, open source Gluu authentication scripts, view our server integrations

An authentication script enables you to customize the user authentication experience. For example, you can write a script that enables a two-factor authentication mechanism like Duo Security. By default oxAuth offers basic username/password authentication. Authentication scripts allow an admin to implement more secure workflows to meet an organizations security requirements. It extends the base script type with the init, destroy and getApiVersion methods but also adds the following methods:

Method	`isValidAuthenticationMethod(self, usageType, configurationAttributes)`
Description	This method is used to check if the authentication method is in a valid state. For example we can check there if a 3rd party mechanism is available to authenticate users. As a result it should either return `True` or `False`
Method Parameter	`usageType` is `org.xdi.model.AuthenticationScriptUsageType` `configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>`

Method	`def getAlternativeAuthenticationMethod(self, usageType, configurationAttributes)`
Description	This method is called only if the current authentication method is in an invalid state. Hence authenticator calls it only if `isValidAuthenticationMethod` returns False. As a result it should return the reserved authentication method name
Method Parameter	`uageType` is `org.xdi.model.AuthenticationScriptUsageType` `configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>`

Method	`def authenticate(self, configurationAttributes, requestParameters, step)`
Description	This method is the key method within the person authentication script. It checks if the user has passed the specified step or not. As a result it should either return `True` or `False`
Method Parameter	`requestParameters` is `java.util.Map<String, String[]>` `step` is java integer `configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>`

Method	`def prepareForStep(self, configurationAttributes, requestParameters, step)`
Description	This method can be used to prepare variables needed to render the login page and store them in an according event context. As a result it should either return `True` or `False`
Method Parameter	`requestParameters` is `java.util.Map<String, String[]>` `step` is a java integer `configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>`

Method	`def getCountAuthenticationSteps(self, configurationAttributes)`
Description	This method should return an integer value with the number of steps in the authentication workflow
Method Parameter	`configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>`

Method	`def getExtraParametersForStep(self, configurationAttributes, step)`
Description	This method provides a way to notify the authenticator that it should store specified event context parameters event in the oxAuth session. It is needed in a few cases, for example when an authentication script redirects the user to a 3rd party authentication system and expects the workflow to resume after that. As a result it should return a java array of strings
Method Parameter	`configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>` `step` is a java integer

Method	`def getPageForStep(self, configurationAttributes, step)`
Description	This method allows the admin to render a required page for a specified authentication step. It should return a string value with a path to an XHTML page. If the return value is empty or null, the authenticator should render the default log in page `/login.xhtml`
Method Parameter	`configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>` `step` is a java integer

Method def logout(self, configurationAttributes, requestParameters)

Description This method is not mandatory. A stub definition of this function is already present in most scripts. It can be used in cases when you need to execute logout logic specific to this authentication script (like notifying remote/3rd party services, writting to databases etc) when oxAuth receives an end session request. In contrary to scripts of "Application session managment" type, this function will only be called in case the user who in process of logging out used this very script where it's implemented for initial authentication. Also, it allows oxAuth to stop processing the end session request workflow if it returns False. As a result it should either return True or False

Method Parameters configurationAttributes is java.util.Map<String, SimpleCustomProperty>
requestParameters is java.util.Map<String, String[]>

This script can be used in oxAuth application only.

Sample Authentication Script

Certificate Authentication#

Gluu Server CE offers a person authentication module enabling Certificate Authentication. The image below contains the design diagram for this module.

The script has a few properties:

Property	Description	Allowed Values	example
`chain_cert_file_path`	mandatory property pointing to certificate chains in pem format	file path	`/etc/certs/chain_cert.pem`
`map_user_cert`	specifies if the script should map new user to local account	true/false	true
`use_generic_validator`	enable/disable specific certificate validation	true/false	false
`use_path_validator`	enable/disable specific certificate validation	true/false	true
`use_oscp_validator`	enable/disable specific certificate validation	true/false	false
`use_crl_validator`	enable/disable specific certificate validation	true/false	false
`crl_max_response_size`	specifies the maximum allowed size of [CRL][crl] response	Integer > 0	2

Sample Certificate Authentication Script

Update User#

oxTrust allows an admin to add and modify users which belong to groups. In order to simplify this process and apply repeating actions, oxTrust supports an Update User script. In this script it is possible to modify a person entry before it is stored in LDAP.

This script type adds only one method to the base script type:

Method	`def updateUser(self, user, persisted, configurationAttributes)`
Description	This method updates the user
Method Parameter	`user` is `org.gluu.oxtrust.model.GluuCustomPerson` persisted is a boolean value to specify the operation type: add/modify `configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>`

This script can be used in an oxTrust application only.

Sample Update User Script

User Registration#

oxTrust allows users to perform self-registration. In order to control/validate user registrations there is the user registration script type.

This script type adds three methods to the base script type:

Methods	`def initRegistration(self, user, requestParameters, configurationAttributes)` `def preRegistration(self, user, requestParameters, configurationAttributes)` `def postRegistration(self, user, requestParameters, configurationAttributes)`
Description	This method enables/disables user account based on the custom property's value
Method Parameters	`user` is `org.gluu.oxtrust.model.GluuCustomPerson` `requestParameters` is `java.util.Map<String, String[]>` `configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>`
Custom Property	`enable_user`--> defaults to `false`
Description	It controls whether or not this user account will be ready for loggin into the Gluu Server CE instance

The methods are executed in the following order:

Order	Method	Expected Return
First	`initRegistration()`	True/False
Second	`preRegistration()`	True/False
Third	`postRegistration()`	True/False

First oxTrust executes the initRegistration method to do an initial user entry update. The preRegistration method is called before storing the user entry in LDAP. Hence in this script it is possible to validate the user entry. The postRegistration method is called after successfully storing the user entry in LDAP. In this method, for example, the script can send an e-mail or send notifications to other organization systems about the new user entry.

Sample User Registration Script

Client Registration#

oxAuth implements the OpenID Connect dynamic client registration specification. All new clients have the same default access scopes and attributes except password and client ID. The Client Registration script allows an admin to modify this limitation. In this script it is possible to get a registration request, analyze it, and apply customizations to registered clients. For example, a script can give access to specified scopes if redirect_uri belongs to a specified service or domain.

This script type adds only one method to the base script type:

Method	`def updateClient(self, registerRequest, client, configurationAttributes)`
Method Parameter	`registerRequest` is `org.xdi.oxauth.client.RegisterRequest` `client` is `org.xdi.oxauth.model.registration.Client` `configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>`

This script can be used in an oxAuth application only.

Sample Client Registration Script

Dynamic Scopes#

The dynamic scope custom script allows to generate list of claims (and their values) on the fly, depending on cirtumstances like id of client requesting it, logged user's session parameters, values of other user's attributes, results of some caclucations implementing specific buisness logic and/or requests to remote APIs or databases. Claims are then returned the usual way in a response to a call to the userinfo endpoint.

Two parameters are passed to the script:

dynamicScopeContext is org.xdi.oxauth.service.external.context.DynamicScopeExternalContext class
configurationAttributes is java.util.Map dictionary carring script's custom properties

In order to configure a dynamic scope next steps are required:

Dynamic scope custom script must be configured and enabled at "Manage custom scripts" page, "Dynamic scopes" tab
A scope has to be defined at the "OpenID Connect -> Scopes" page
Scope's type must be set to "Dynamic"
Corresponding dynamic script must be linked to that scope (Add dynamic script button)
The scope must be added to the client which will be using it at the "OpenID Connect -> Clients" page (using the "Add Scope" button), and the scope must be included by the client in "scope=" url query parameter

More detailed explanation about adding scopes can be found under Openid scopes

Sample Dynamic Scope Script

ID Generator#

By default oxAuth/oxTrust uses an internal method to generate unique identifiers for new person/client, etc. entries. In most cases the format of the ID is:

'!' + idType.getInum() + '!' + four_random_HEX_characters + '.' + four_random_HEX_characters.

The ID generation script enables an admin to implement custom ID generation rules.

This script type adds only one method to the base script type:

Method	`def generateId(self, appId, idType, idPrefix, configurationAttributes)`
Method Parameter	`appId` is application ID `idType` is ID Type `idPrefix` is ID Prefix `user` is `org.gluu.oxtrust.model.GluuCustomPerson` `configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>`

This script can be used in an oxTrust application only.

Sample ID Generation Script

Cache Refresh#

In order to integrate your Gluu instance with backend LDAP servers handling authentication in your existing network environment, oxTrust provides a mechanism called Cache Refresh to copy user data to the Gluu Server's local LDAP server. During this process it is possible to specify key attribute(s) and specify attribute name transformations. There are also cases when it can be used to overwrite attribute values or to add new attributes based on other attribute values.

This script type adds only one method to the base script type:

Method	`def updateUser(self, user, configurationAttributes)`
Method Parameter	`user` is `org.gluu.oxtrust.model.GluuCustomPerson` `configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>`

This script can be used in an oxTrust application only.

Sample Cache Refresh Script

UMA Authorization Policies#

This is a special script for UMA. It allows an admin to protect UMA scopes with policies. It is possible to add more than one UMA policy to an UMA scope. On requesting access to a specified resource, the application should call specified UMA policies in order to grant or deny access.

This script type adds only one method to the base script type:

Method	`def authorize(self, authorizationContext, configurationAttributes)`
Method Parameter	`authorizationContext` is `org.xdi.oxauth.service.uma.authorization.AuthorizationContext` `configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>`

This script can be used in an oxAuth application only.

Sample Authorization Script

Application Session Management#

These scripts can be used in cases when you need to execute some generel logout logic (like notifying remote/3rd party services, writting to databases etc) applicable to any user. They are triggered when oxAuth receives an end session request. In contrary to logout functions which may be added to scripts of Person Authentication type to serve a similar purpose, Session Management scripts are called for any user who is about to log out. It's possible to add multiple scripts with this type, they will be called according to set priority/level.

This script provides only one method to implement:

Method	`def endSession(self, httpRequest, authorizationGrant, configurationAttributes)`
Method Parameter	`httpRequest` is `javax.servlet.http.HttpServletRequest` `authorizationGrant` is `org.xdi.oxauth.model.common.AuthorizationGrant` `configurationAttributes` is `java.util.Map<String, SimpleCustomProperty>`

Sample Application Session Management Script