# REST session backend

Session <type> can be ‘global’ for SSO sessions or ‘persistent’ for persistent sessions.

LL::NG portal provides REST end points for sessions management:

- GET /sessions/<type>/<session-id> : get session datas

- GET /sessions/<type>/<session-id>/<key> : get a session key value

- GET /sessions/<type>/<session-id>/[k1,k2] : get some session key value

- POST /sessions/<type> : create a session

- PUT /sessions/<type>/<session-id> : update some keys

- DELETE /sessions/<type>/<session-id> : delete a session

Sessions for connected users (used by LLNG Proxy):

- GET /session/my/<type> : get session datas

- GET /session/my/<type>/key : get session key

- DELETE /session/my : ask for logout

Authorizations for connected users (always enabled):

- GET /mysession/?authorizationfor=<base64-encoded-url>: ask if url is authorizated

This session backend can be used to share sessions stored in a non-network backend (like file session backend) or in a network backend protected with a firewall that only accepts HTTP flows.

Most of the time, REST session backend is used by Handlers installed on external servers.

To configure it, REST session backend will be set through Manager in global configuration (used by all Handlers), and the real session backend will be configured for local components in lemonldap-ng.ini.

## Setup

### Manager

First, activate REST in `General parameters` » `Plugins` » `Portal servers` » `REST session server`.

Then, set `Lemonldap::NG::Common::Apache::Session::REST` in `General parameters` » `Sessions` » `Session storage` » `Apache::Session module` and add the following parameters (case sensitive):

Required parameters
Name | Comment | Example
--- | --- | ---
baseUrl | URL of sessions REST end point | http://auth.example.com/index.fcgi/sessions/global

Optional parameters
Name | Comment | Example
--- | --- | ---
user | Username to use for auth basic mechanism |
password | Password to use for auth basic mechanism |

user and password parameters are only used if the entry point index.fcgi/sessions/global is protected by a basic authentication. Thus, handlers will make requests to the portal using these parameters.

Attention

By default, user password and other secret keys are hidden by LLNG REST server. You can force REST server to export their real values by selecting “Export secret attributes in REST” in the manager. This less secure option is disabled by default.

### Apache

Sessions REST end points access must be allowed in Apache portal configuration (for example, access by IP range):

    # REST/SOAP functions for sessions access (disabled by default)
    <Location /index.fcgi/sessions>
        Require ip 192.168.2.0/24
    </Location>

### Real session backend

Real session backend will be configured in `lemonldap-ng.ini`, in `portal` section (the portal hosts the REST service for sessions, and will do the link between REST requests and real sessions).

For example, if real sessions are stored in files:

    [portal]
    globalStorage = Apache::Session::File
    globalStorageOptions = { 'Directory' => '/var/lib/lemonldap-ng/sessions/', 'LockDirectory' => '/var/lib/lemonldap-ng/sessions/lock/', }

Tip

Session explorer and “single session” features can’t be used using this backend. Session explorer and portal must be launched with real backend.

By default, only few sessions keys are shared by REST (authenticationLevel, groups, ipAddr, _startTime, _utime, _lastSeen, _session_id), you need to define which other keys you want to share in `General parameters` » `Plugins` » `Portal servers` » `SOAP/REST exported attributes`.

You must start with `+` to keep default keys, else they will not be shared. For example:

    + uid cn mail

To share only the listed attributes:

    authenticationLevel groups ipAddr _startTime _utime _lastSeen _session_id uid cn mail