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Registration

Overview

NOTE: This feature is beta: it is considered stable enough for production but is incomplete and may contain bugs.

Registration is an enhanced feature of mxisd to control registrations involving 3PIDs on a Homeserver based on policies:

  • Match pending 3PID invites on the server
  • Match 3PID pattern, like a specific set of domains for emails
  • In further releases, use 3PIDs found in Identity stores

It aims to help open or invite-only registration servers control what is possible to do and ensure only approved people can register on a given server in a implementation-agnostic manner.

IMPORTANT: This feature does not control registration in general. It only acts on endpoints related to 3PIDs during the registration process.
As such, it relies on the homeserver to require 3PIDs with the registration flows.

This feature is not part of the Matrix Identity Server spec.

Integration

mxisd needs to be integrated at several levels for this feature to work:

  • Reverse proxy: intercept the 3PID register endpoints and act on them
  • Homeserver: require 3PID to be part of the registration data

Later version(s) of this feature may directly control registration itself to create a coherent experience

Reverse Proxy

nginx

location ~* ^/_matrix/client/r0/register/[^/]+/requestToken$ {
	proxy_pass		http://localhost:8090;
	proxy_set_header	Host $host;
	proxy_set_header	X-Forwarded-For $remote_addr;
}

Apache2

TBC

Homeserver

Synapse

enable_registration: true
registrations_require_3pid:
  - email

Configuration

See the Configuration introduction doc on how to read the configuration keys.
An example of working configuration is available at the end of this section.

Enable/Disable

register.allowed, taking a boolean, can be used to enable/disable registration if the attempt is not 3PID-based.
false is the default value to prevent open registration, as you must allow it on the homeserver side.

For invites

register.invite, taking a boolean, controls if registration can be made using a 3PID which matches a pending 3PID invite.
true is the default value.

3PID-specific

At this time, only email is supported with 3PID specific configuration with this feature.

Email

Base key: register.threepid.email

Domain whitelist/blacklist

If you would like to control which domains are allowed to be used when registering with an email, the following sub-keys are available:

  • domain.whitelist
  • domain.blacklist

The value format is an hybrid between glob patterns and postfix configuration files with the following syntax:

  • *<domain> will match the domain and any sub-domain(s)
  • .<domain> will only match sub-domain(s)
  • <domain> will only match the exact domain

The following table illustrates pattern and matching status against example values:

Config value Matches example.org Matches sub.example.org
*example.org Yes Yes
.example.org No Yes
example.org Yes No

Example

For the following example configuration:

register:
  policy:
    threepid:
      email:
        domain:
          whitelist:
            - '*example.org'
            - '.example.net'
            - 'example.com'
  • Users can register using 3PIDs of pending invites, being allowed by default.
  • Users can register using an email from example.org and any sub-domain, only sub-domains of example.net and example.com but not its sub-domains.
  • Otherwise, user registration will be denied.

Usage

Nothing special is needed. Register using a regular Matrix client.