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145 lines
7.6 KiB
Markdown
145 lines
7.6 KiB
Markdown
<!--
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SPDX-FileCopyrightText: 2023 - 2025 MDAD project contributors
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SPDX-FileCopyrightText: 2024 - 2025 Suguru Hirahara
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SPDX-License-Identifier: AGPL-3.0-or-later
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-->
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# Setting up Matrix User Verification Service (optional)
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The playbook can install and configure [Matrix User Verification Service](https://github.com/matrix-org/matrix-user-verification-service) (hereafter: UVS) for you.
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See the project's [documentation](https://github.com/matrix-org/matrix-user-verification-service/blob/master/README.md) to learn what it does and why it might be useful to you.
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Currently, the main purpose of this role is to allow Jitsi to authenticate Matrix users and check if they are authorized to join a conference. If the Jitsi server is also configured by this playbook, all plugging of variables and secrets is handled in `group_vars/matrix_servers`.
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## What does it do?
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UVS can be used to verify two claims:
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* (A) Whether a given OpenID token is valid for a given server and
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* (B) whether a user is member of a given room and the corresponding PowerLevel
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Verifying an OpenID token ID done by finding the corresponding Homeserver via `/.well-known/matrix/server` for the given domain. The configured `matrix_user_verification_service_uvs_homeserver_url` does **not** factor into this. By default, this playbook only checks against `matrix_server_fqn_matrix`. Therefore, the request will be made against the public `openid` API for `matrix_server_fqn_matrix`.
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Verifying RoomMembership and PowerLevel is done against `matrix_user_verification_service_uvs_homeserver_url` which is by default done via the docker network. UVS will verify the validity of the token beforehand though.
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## Prerequisites
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### Open Matrix Federation port
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Enabling the UVS service will automatically reconfigure your Synapse homeserver to expose the `openid` API endpoints on the Matrix Federation port (usually `8448`), even if [federation](configuring-playbook-federation.md) is disabled. If you enable the component, make sure that the port is accessible.
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### Install Matrix services
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UVS can only be installed after Matrix services are installed and running. If you're just installing Matrix services for the first time, please continue with the [Configuration](configuring-playbook.md) / [Installation](installing.md) and come back here later.
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### Register a dedicated Matrix user (optional, recommended)
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We recommend that you create a dedicated Matrix user for uvs (`uvs` is a good username). **Because UVS requires an access token as an admin user, that user needs to be an admin.**
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Generate a strong password for the user. You can create one with a command like `pwgen -s 64 1`.
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You can use the playbook to [register a new user](registering-users.md):
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```sh
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ansible-playbook -i inventory/hosts setup.yml --extra-vars='username=uvs password=PASSWORD_FOR_THE_USER admin=yes' --tags=register-user
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```
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### Obtain an access token
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UVS requires an access token as an admin user to verify RoomMembership and PowerLevel against `matrix_user_verification_service_uvs_homeserver_url`. Refer to the documentation on [how to obtain an access token](obtaining-access-tokens.md).
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> [!WARNING]
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> Access tokens are sensitive information. Do not include them in any bug reports, messages, or logs. Do not share the access token with anyone.
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## Adjusting the playbook configuration
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To enable UVS, add the following configuration to your `inventory/host_vars/matrix.example.com/vars.yml` file. Make sure to replace `ACCESS_TOKEN_HERE` with the one created [above](#obtain-an-access-token).
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```yaml
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matrix_user_verification_service_enabled: true
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matrix_user_verification_service_uvs_access_token: "ACCESS_TOKEN_HERE"
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```
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In the default configuration, the UVS Server is only reachable via the docker network, which is fine if e.g. Jitsi is also running in a container on the host. However, it is possible to expose UVS via setting `matrix_user_verification_service_container_http_host_bind_port`.
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### Custom Auth Token (optional)
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It is possible to set an API Auth Token to restrict access to the UVS. If this is enabled, anyone making a request to UVS must provide it via the header `Authorization: Bearer YOUR_TOKEN_HERE`.
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By default, the token (`YOUR_TOKEN_HERE`) will be derived from `matrix_homeserver_generic_secret_key` in `group_vars/matrix_servers`.
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To set your own token, add the following configuration to your `vars.yml` file. Make sure to replace `YOUR_TOKEN_HERE` with your own.
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```yaml
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matrix_user_verification_service_uvs_auth_token: "YOUR_TOKEN_HERE"
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```
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If a Jitsi instance is also managed by this playbook and [`matrix` authentication](configuring-playbook-jitsi.md#authenticate-using-matrix-openid-auth-type-matrix) is enabled there, this collection will automatically configure Jitsi to use the configured auth token.
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### Disable Authorization (optional)
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Authorization is enabled by default. To disable it, add the following configuration to your `vars.yml` file:
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```yaml
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matrix_user_verification_service_uvs_require_auth: false
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```
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### Federation (optional)
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In theory (however currently untested), UVS can handle federation. To enable it, add the following configuration to your `vars.yml` file:
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```yaml
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matrix_user_verification_service_uvs_pin_openid_verify_server_name: false
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```
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This will instruct UVS to verify the OpenID token against any domain given in a request. Homeserver discovery is done via `.well-known/matrix/server` of the given domain.
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### Extending the configuration
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There are some additional things you may wish to configure about the component.
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Take a look at:
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- `roles/custom/matrix-user-verification-service/defaults/main.yml` for some variables that you can customize via your `vars.yml` file
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## Installing
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After configuring the playbook, run it with [playbook tags](playbook-tags.md) as below:
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<!-- NOTE: let this conservative command run (instead of install-all) to make it clear that failure of the command means something is clearly broken. -->
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```sh
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ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start
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```
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The shortcut commands with the [`just` program](just.md) are also available: `just install-service matrix-user-verification-service` or `just setup-all`
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`just install-service matrix-user-verification-service` is useful for maintaining your setup quickly when its components remain unchanged. If you adjust your `vars.yml` to remove other components, you'd need to run `just setup-all`, or these components will still remain installed. Note `just setup-all` runs the `ensure-matrix-users-created` tag too.
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## Troubleshooting
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As with all other services, you can find the logs in [systemd-journald](https://www.freedesktop.org/software/systemd/man/systemd-journald.service.html) by logging in to the server with SSH and running `journalctl -fu matrix-user-verification-service`.
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### Increase logging verbosity
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The default logging level for this component is `info`. If you want to increase the verbosity, add the following configuration to your `vars.yml` file and re-run the playbook:
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```yaml
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# See choices here: https://github.com/winstonjs/winston#logging-levels
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matrix_user_verification_service_uvs_log_level: debug
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```
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### TLS Certificate Checking
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If the Matrix Homeserver does not provide a valid TLS certificate, UVS will fail with the following error message:
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> message: 'No response received: [object Object]',
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This also applies to self-signed and Let's Encrypt staging certificates.
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To disable certificate validation altogether (INSECURE! Not suitable for production use!) set: `NODE_TLS_REJECT_UNAUTHORIZED=0`
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Alternatively, it is possible to inject your own CA certificates into the container by mounting a PEM file with additional trusted CAs into the container and pointing the `NODE_EXTRA_CA_CERTS` environment variable to it.
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