Modules - OpenAM: Admin guide
When the module is enabled in the CzechIdM, users can authenticate to CzechIdM with their login and password valid for OpenAM. Or they may be authenticated by Single-Sign-On when they already have valid OpenAM session.
To do that, the module uses standard REST APIs of OpenAM, namely:
- Authentication & Logout endpoints
- Token Validation and Attribute Retrieval (or Session Information) endpoints
OpenAM versions
The module is compatible with multiple versions of OpenAM and uses different types of their REST APIs:
- OpenAM 10 - 12: the module uses OpenAM RESTful API (known also as Legacy API for OpenAM12)
- OpenAM 13 - 14: the module uses REST API of OpenAM13
- CAS proxy (special interface for CAS in IAM appliance) - the module uses REST API similar to OpenAM13, only additional headers are used during authentication
The version of used OpenAM is determined by a special configuration property of the module - idm.sec.openam.api.type (see Configuration).
Authentication token
Token for successfully authenticated users is set to the cookie of the (default) name iPlanetDirectoryPro for the current request domain. This way, other applications may authorize the users who were previously authenticated by CzechIdM (resp. OpenAM).
The cookie is set only for secured (https) connections by default. If you need to set it for unsecured connections, configure the property idm.sec.openam.sso.cookie.secure=false. This is strongly discouraged for production use!
SSO
Single-Sign-On functionality of the OpenAM module is done by a new authentication filter. When unauthenticated users come to CzechIdM and have the cookie with OpenAM token, the value of the token is validated against OpenAM. If the token is valid, the filter retrieves the user's login from OpenAM attributes and logs the user in.
Multiple instances and realms
The module supports multiple instances of OpenAM. The URLs must be configured in the property idm.sec.openam.base.url separated by a comma. Authentication or token validation uses the configured instances one by one. The first instance that returns a success is the winner (no more calls are made to remaining instances).
The module also supports authentication realms in OpenAM. If configured, the realm(s) are used during authentication in the same order as the configured URLs of the instances.
REST endpoint
The module also provides a REST endpoint /get-attributes for retrieving OpenAM attributes for given SSO token. When calling the endpoint, the user's session by OpenAM can be refreshed (this is an optional parameter, default is false).
The attributes are returned in lower case.
Installation
See the Tutorial.
Configuration
The module provides following configuration properties:
| Property | Description |
|---|---|
| idm.sec.openam.base.url | REQUIRED. Base URL of the REST API (e.g. https://amhost.domain.tld/openam/identity ). The property may contain multiple instances comma-separated. |
| idm.sec.openam.api.type | Type of OpenAM - expected version of the REST API. If multiple URLs are configured, configure this property also as multivalued and in the order corresponding to those URLs. Supported values are: OPENAM12 (default), OPENAM13, CASPROXY |
| idm.sec.openam.login.payload | The string that is appended to the authentication request, usually realm (e.g. uri=realm=/customers). If multiple URLs are configured, configure this property also as multivalued and in the order corresponding to those URLs. (default: empty) |
| idm.sec.openam.login.attr.name | Name of the OpenAM attribute which holds user login (default: uid) |
| idm.sec.openam.sso.cookie.name | Name of the cookie which holds OpenAM token (default: iPlanetDirectoryPro) |
| idm.sec.openam.sso.cookie.domain | Domain, for which the cookie will be set. If empty, request root domain will be used. |
| idm.sec.openam.sso.cookie.httponly | Whether the cookie should have Http-Only sign (default: true) |
| idm.sec.openam.sso.cookie.secure | Whether the cookie should be sent for encrypted sessions only (https) (default: true) |
| idm.sec.openam.returned.attributes | Which attributes will be returned by /get-attributes endpoint, written in lower case (default: uid,dn,destinationindicator,ou) |
| idm.sec.openam.connect.timeout | The time limit to establish the connection in ms (default: 2000), change requires restart |
| idm.sec.openam.socket.timeout | The time limit waiting for data after the connection was established in ms (default: 2000), change requires restart |
Notes
Note that the module doesn't provide "Single-Sign-Off" - it doesn't check the validity of the users' sessions when they are already authenticated to CzechIdM.
The module has only the backend part.
For CASPROXY type, the module doesn't support non-ASCII passwords in authentication for now.