matrix-docker-ansible-deploy/docs/configuring-playbook-bridge-mautrix-signal.md

Setting up Mautrix Signal (optional)

The playbook can install and configure mautrix-signal for you.

See the project's documentation to learn what it does and why it might be useful to you.

Note/Prerequisite: If you're running with the Postgres database server integrated by the playbook (which is the default), you don't need to do anything special and can easily proceed with installing. However, if you're using an external Postgres server, you'd need to manually prepare a Postgres database for this bridge and adjust the variables related to that (matrix_mautrix_signal_database_*).

Use the following playbook configuration:

matrix_mautrix_signal_enabled: true

There are some additional things you may wish to configure about the bridge before you continue.

The relay bot functionality is off by default. If you would like to enable the relay bot, add the following to your vars.yml file:

matrix_mautrix_signal_relaybot_enabled: true

If you want to activate the relay bot in a room, use !signal set-relay. Use !signal unset-relay to deactivate. Additionally the permissions for the bridge grant user rights to all base domain users in case the relay bot is disabled, or relay rights in case the relay bot is enabled.

If you would like to have a more specific setting of the permissions you can set the permissions as follows (example). For more details see also mautrix-bridge documentation

matrix_mautrix_signal_configuration_extension_yaml: |
  bridge:
    permissions:
      '@YOUR_USERNAME:YOUR_DOMAIN': admin
      YOUR_DOMAIN: user
      '*': relay  

You may wish to look at roles/matrix-bridge-mautrix-signal/templates/config.yaml.j2 to find more information on the permissions settings and other options you would like to configure.

Set up Double Puppeting

If you'd like to use Double Puppeting (hint: you most likely do), you have 2 ways of going about it.

Method 1: automatically, by enabling Shared Secret Auth

The bridge will automatically perform Double Puppeting if you enable Shared Secret Auth for this playbook.

This is the recommended way of setting up Double Puppeting, as it's easier to accomplish, works for all your users automatically, and has less of a chance of breaking in the future.

Method 2: manually, by asking each user to provide a working access token

Note: This method for enabling Double Puppeting can be configured only after you've already set up bridging (see Usage).

When using this method, each user that wishes to enable Double Puppeting needs to follow the following steps:

• retrieve a Matrix access token for yourself. You can use the following command:

curl \
--data '{"identifier": {"type": "m.id.user", "user": "YOUR_MATRIX_USERNAME" }, "password": "YOUR_MATRIX_PASSWORD", "type": "m.login.password", "device_id": "Mautrix-Signal", "initial_device_display_name": "Mautrix-Signal"}' \
https://matrix.DOMAIN/_matrix/client/r0/login

• send the access token to the bot. Example: login-matrix MATRIX_ACCESS_TOKEN_HERE

• make sure you don't log out the Mautrix-Signal device some time in the future, as that would break the Double Puppeting feature

Usage

You then need to start a chat with @signalbot:YOUR_DOMAIN (where YOUR_DOMAIN is your base domain, not the matrix. domain).