mod_client_management

This module allows a user to identify what currently has access to their account.

This module depends on mod_sasl2_fast and mod_tokenauth (bundled with Prosody). Both will be automatically loaded if this module is loaded.

Configuration

When enforce_client_ids is not enabled, the client listing may be less accurate due to legacy clients, which can only be tracked by their resource, which is public information, not necessarily unique to a client instance, and is also exposed to other XMPP entities the user communicates with.

When enforce_client_ids is enabled, clients that don’t support SASL2 and provide a client id will be denied access.

Shell usage

You can use this module via the Prosody shell. For example, to list a user’s clients:

prosodyctl shell user clients user@example.com

To revoke access from particular client:

prosodyctl shell user revoke_client user@example.com grant/xxxxx

Compatibility

Requires Prosody trunk (as of 2023-03-29). Not compatible with Prosody 0.12 and earlier.

Developers

Protocol

Listing clients

To list clients that have access to the user’s account, send the following stanza:

<iq id="p" type="get">
  <list xmlns="xmpp:prosody.im/protocol/manage-clients"/>
</iq>

The server will respond with a list of clients:

<iq id="p" to="mattj-gajim@auth2.superxmpp.com/gajim.UYJKBHKT" type="result" xmlns="jabber:client">
  <clients xmlns="xmpp:prosody.im/protocol/manage-clients">
    <client connected="true" id="client/zeiP41HLglIu" type="session">
      <first-seen>2023-04-06T14:26:08Z</first-seen>
      <last-seen>2023-04-06T14:37:25Z</last-seen>
      <auth>
        <password/>
      </auth>
      <user-agent>
        <software>Gajim</software>
        <uri>https://gajim.org/</uri>
        <device>Juliet's laptop</device>
      </user-agent>
    </client>
    <client connected="false" id="grant/HjEEr45_LQr" type="access">
      <first-seen>2023-03-27T15:16:09Z</first-seen>
      <last-seen>2023-03-27T15:37:24Z</last-seen>
      <user-agent>
        <software>REST client</software>
      </user-agent>
    </client>
  </clients>
</iq>

On the <client/> tag most things are self-explanatory. The following attributes are defined:

• ‘connected’: a boolean that reflects whether this client has an active session on the server (i.e. this includes connected and “hibernating” sessions).
• ‘id’: an opaque reference for the client, which can be used to revoke access.
• ‘type’: either "session" if this client is known to have an active or inactive client session on the server, or “access” if no session has been established (e.g. it may have been granted access to the account, but only used non-XMPP APIs or never logged in).

The <first-seen/> and <last-seen/> elements contain timestamps that reflect when a client was first granted access to the user’s account, and when it most recently used that access. For active sessions, it may reflect the current time or the time of the last login.

The <user-agent/> element contains information about the client software. It may contain any of three optional child elements, each containing text content:

• <software/> - the name of the software
• <uri/> - a URI/URL for the client, such as a homepage
• <device/> - a human-readable identifier/name for the device where the client runs

The <auth/> element lists the known authentication methods that the client has used to gain access to the account. The following elements are defined:

• <password/> - the client has presented a valid password
• <grant/> - the client has a valid authorization grant (e.g. via OAuth)
• <fast/> - the client has active FAST tokens

Revoking access

To revoke a client’s access, send a <revoke/> element with an ‘id’ attribute containing one of the client ids fetched from the list:

<iq id="p" type="set">
  <revoke xmlns="xmpp:prosody.im/protocol/manage-clients" id="grant/HjEEr45_LQr" />
</iq>

The server will respond with an empty result if the revocation succeeds:

<iq id="p" type="result" />

If the client has previously authenticated with a password, there is no way to revoke access except by changing the user’s password. If you request revocation of such a client, the server will respond with a ‘service-unavailable’ error, with the ‘password-reset-required’ application error:

<iq id="p" type="error">
  <error type="cancel">
    <service-unavailable xmlns="xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'">
    <password-reset-required xmlns="xmpp:prosody.im/protocol/manage-clients"/>
  </error>
</iq>

sudo prosodyctl install --server=https://modules.prosody.im/rocks/ mod_client_management