---

labels:

- 'Stage-Alpha'

summary: 'XEP-0356 (Privileged Entity) implementation'

...

Introduction

============

Privileged Entity is an extension which allows entity/component to have

privileged access to server (set/get roster, send message on behalf of

server, access presence informations). It can be used to build services

independently of server (e.g.: PEP service).

Details

=======

You can have all the details by reading the

[XEP-0356](http://xmpp.org/extensions/xep-0356.html).

If you use it with a component, you need to patch

core/mod\_component.lua to fire a new signal. To do it, copy the

following patch in a, for example, /tmp/component.patch file:

``` {.patch}

    diff --git a/plugins/mod_component.lua b/plugins/mod_component.lua

    --- a/plugins/mod_component.lua

    +++ b/plugins/mod_component.lua

    @@ -85,6 +85,7 @@

                    session.type = "component";

                    module:log("info", "External component successfully authenticated");

                    session.send(st.stanza("handshake"));

    +               module:fire_event("component-authenticated", { session = session });

                    return true;

            end

```

`patch -p1 < /tmp/component.patch`

Usage

=====

To use the module, like usual add **"privilege"** to your

modules\_enabled. Note that if you use it with a local component, you

also need to activate the module in your component section:

    modules_enabled = {

            [...]

            "privilege";

    }

    [...]

    Component "youcomponent.yourdomain.tld"

        component_secret = "yourpassword"

        modules_enabled = {"privilege"}

then specify privileged entities **in your host section** like that:

    VirtualHost "yourdomain.tld"

        privileged_entities = {

            ["romeo@montaigu.lit"] = {

                roster = "get";

                presence = "managed_entity";

            },

            ["juliet@capulet.lit"] = {

                roster = "both";

                message = "outgoing";

                presence = "roster";

            },

        }

Here *romeo@montaigu.lit* can **get** roster of anybody on the host, and

will **have presence for any user** of the host, while

*juliet@capulet.lit* can **get** and **set** a roster, **send messages**

on the behalf of the server, and **access presence of anybody linked to

the host** (not only people on the server, but also people in rosters of

users of the server).

**/! Be extra careful when you give a permission to an entity/component,

it's a powerful access, only do it if you absoly trust the

component/entity, and you know where the software is coming from**

Configuration

=============

  -------- ------------------------------------------------ ----------------------

  roster   none *(default)*                                 No access to rosters

  get      Allow **read** access to rosters                 

  set      Allow **write** access to rosters                

  both     Allow **read** and **write** access to rosters   

  -------- ------------------------------------------------ ----------------------

message

-------

  ------------------ ------------------------------------------------------------

  none *(default)*   Can't send message from server

  outgoing           Allow to send message on behalf of server (from bare jids)

  ------------------ ------------------------------------------------------------

presence

--------

  ------------------ ------------------------------------------------------------------------------------------------

  none *(default)*   Do not have extra presence information

  managed\_entity    Receive presence stanzas (except subscriptions) from host users

  roster             Receive all presence stanzas (except subsciptions) from host users and people in their rosters

  ------------------ ------------------------------------------------------------------------------------------------

Compatibility

=============

  ----- ----------------------------------------------------

  dev   Need a patched core/mod\_component.lua (see above)

  0.9   Need a patched core/mod\_component.lua (see above)

  ----- ----------------------------------------------------

Note

====

This module is often used with mod\_delegation (c.f. XEP for more

details)