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Synapse REST Password provider


This synapse's password provider allows you to validate a password for a given username and return a user profile using an existing backend, like:

  • Forums (phpBB, Discourse, etc.)
  • Custom Identity stores (Keycloak, ...)
  • CRMs (Wordpress, ...)
  • self-hosted clouds (Nextcloud, ownCloud, ...)

It is mainly used with ma1sd, the Federated Matrix Identity Server, to provide missing features and offer a fully integrated solution (directory, authentication, search).

NOTE: This module doesn't provide direct integration with any backend. If you do not use mxisd, you will need to write your own backend, following the Integration section. This module simply translate an anthentication result and profile information into actionables in synapse, and adapt your user profile with what is given.


Copy in whichever directory python can pick it up as a module.

sudo pip install git+

If the command fail, double check that the python version still matches. If not, please let us know by opening an issue.


Add or amend the password_providers entry like so:

  - module: "rest_auth_provider.RestAuthProvider"
      endpoint: ""

Set endpoint to the value documented with the endpoint provider.


  1. Install, configure, restart synapse
  2. Try to login with a valid username and password for the endpoint configured

Next steps

Lowercase username enforcement

NOTE: This is no longer relevant as synapse natively enforces lowercase.

To avoid creating users accounts with uppercase characters in their usernames and running into known issues regarding case sensitivity in synapse, attempting to login with such username will fail.

It is highly recommended to keep this feature enable, but in case you would like to disable it:

            enforceLowercase: false

Profile auto-fill

By default, on first login, the display name is set to the one returned by the backend.
If none is given, the display name is not set.
Upon subsequent login, the display name is not changed.

If you would like to change the behaviour, you can use the following configuration items:

            name: true
            name: false

3PIDs received from the backend are merged with the ones already linked to the account. If you would like to change this behaviour, you can use the following configuration items:

            update: false
            replace: false

If update is set to false, the 3PIDs will not be changed at all. If replace is set to true, all 3PIDs not available in the backend anymore will be deleted from synapse.


To use this module with your back-end, you will need to implement a single REST endpoint:

Path: /_matrix-internal/identity/v1/check_credentials
Method: POST
Body as JSON UTF-8:

  "user": {
    "id": "",
    "password": "passwordOfTheUser"

If the credentials are accepted, the following JSON answer will be provided:

  "auth": {
    "success": true,
    "mxid": "",
    "profile": {
      "display_name": "John Doe",
      "three_pids": [
          "medium": "email",
          "address": ""
          "medium": "msisdn",
          "address": "123456789"

auth.profile and any sub-key are optional.

If the credentials are refused, the following JSON answer will be provided:

  "auth": {
    "success": false