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207 lines
7.0 KiB
Markdown
207 lines
7.0 KiB
Markdown
# Configuring Synapse to authenticate against an OpenID Connect provider
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Synapse can be configured to use an OpenID Connect Provider (OP) for
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authentication, instead of its own local password database.
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Any OP should work with Synapse, as long as it supports the authorization code
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flow. There are a few options for that:
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- start a local OP. Synapse has been tested with [Hydra][hydra] and
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[Dex][dex-idp]. Note that for an OP to work, it should be served under a
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secure (HTTPS) origin. A certificate signed with a self-signed, locally
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trusted CA should work. In that case, start Synapse with a `SSL_CERT_FILE`
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environment variable set to the path of the CA.
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- set up a SaaS OP, like [Google][google-idp], [Auth0][auth0] or
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[Okta][okta]. Synapse has been tested with Auth0 and Google.
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It may also be possible to use other OAuth2 providers which provide the
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[authorization code grant type](https://tools.ietf.org/html/rfc6749#section-4.1),
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such as [Github][github-idp].
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[google-idp]: https://developers.google.com/identity/protocols/oauth2/openid-connect
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[auth0]: https://auth0.com/
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[okta]: https://www.okta.com/
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[dex-idp]: https://github.com/dexidp/dex
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[hydra]: https://www.ory.sh/docs/hydra/
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[github-idp]: https://developer.github.com/apps/building-oauth-apps/authorizing-oauth-apps
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## Preparing Synapse
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The OpenID integration in Synapse uses the
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[`authlib`](https://pypi.org/project/Authlib/) library, which must be installed
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as follows:
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* The relevant libraries are included in the Docker images and Debian packages
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provided by `matrix.org` so no further action is needed.
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* If you installed Synapse into a virtualenv, run `/path/to/env/bin/pip
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install synapse[oidc]` to install the necessary dependencies.
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* For other installation mechanisms, see the documentation provided by the
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maintainer.
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To enable the OpenID integration, you should then add an `oidc_config` section
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to your configuration file (or uncomment the `enabled: true` line in the
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existing section). See [sample_config.yaml](./sample_config.yaml) for some
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sample settings, as well as the text below for example configurations for
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specific providers.
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## Sample configs
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Here are a few configs for providers that should work with Synapse.
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### [Dex][dex-idp]
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[Dex][dex-idp] is a simple, open-source, certified OpenID Connect Provider.
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Although it is designed to help building a full-blown provider with an
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external database, it can be configured with static passwords in a config file.
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Follow the [Getting Started
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guide](https://github.com/dexidp/dex/blob/master/Documentation/getting-started.md)
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to install Dex.
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Edit `examples/config-dev.yaml` config file from the Dex repo to add a client:
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```yaml
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staticClients:
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- id: synapse
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secret: secret
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redirectURIs:
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- '[synapse public baseurl]/_synapse/oidc/callback'
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name: 'Synapse'
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```
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Run with `dex serve examples/config-dex.yaml`.
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Synapse config:
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```yaml
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oidc_config:
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enabled: true
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skip_verification: true # This is needed as Dex is served on an insecure endpoint
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issuer: "http://127.0.0.1:5556/dex"
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client_id: "synapse"
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client_secret: "secret"
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scopes: ["openid", "profile"]
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user_mapping_provider:
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config:
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localpart_template: "{{ user.name }}"
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display_name_template: "{{ user.name|capitalize }}"
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```
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### [Auth0][auth0]
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1. Create a regular web application for Synapse
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2. Set the Allowed Callback URLs to `[synapse public baseurl]/_synapse/oidc/callback`
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3. Add a rule to add the `preferred_username` claim.
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<details>
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<summary>Code sample</summary>
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```js
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function addPersistenceAttribute(user, context, callback) {
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user.user_metadata = user.user_metadata || {};
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user.user_metadata.preferred_username = user.user_metadata.preferred_username || user.user_id;
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context.idToken.preferred_username = user.user_metadata.preferred_username;
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auth0.users.updateUserMetadata(user.user_id, user.user_metadata)
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.then(function(){
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callback(null, user, context);
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})
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.catch(function(err){
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callback(err);
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});
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}
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```
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</details>
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Synapse config:
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```yaml
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oidc_config:
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enabled: true
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issuer: "https://your-tier.eu.auth0.com/" # TO BE FILLED
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client_id: "your-client-id" # TO BE FILLED
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client_secret: "your-client-secret" # TO BE FILLED
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scopes: ["openid", "profile"]
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user_mapping_provider:
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config:
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localpart_template: "{{ user.preferred_username }}"
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display_name_template: "{{ user.name }}"
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```
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### GitHub
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GitHub is a bit special as it is not an OpenID Connect compliant provider, but
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just a regular OAuth2 provider.
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The [`/user` API endpoint](https://developer.github.com/v3/users/#get-the-authenticated-user)
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can be used to retrieve information on the authenticated user. As the Synaspse
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login mechanism needs an attribute to uniquely identify users, and that endpoint
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does not return a `sub` property, an alternative `subject_claim` has to be set.
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1. Create a new OAuth application: https://github.com/settings/applications/new.
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2. Set the callback URL to `[synapse public baseurl]/_synapse/oidc/callback`.
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Synapse config:
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```yaml
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oidc_config:
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enabled: true
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discover: false
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issuer: "https://github.com/"
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client_id: "your-client-id" # TO BE FILLED
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client_secret: "your-client-secret" # TO BE FILLED
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authorization_endpoint: "https://github.com/login/oauth/authorize"
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token_endpoint: "https://github.com/login/oauth/access_token"
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userinfo_endpoint: "https://api.github.com/user"
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scopes: ["read:user"]
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user_mapping_provider:
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config:
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subject_claim: "id"
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localpart_template: "{{ user.login }}"
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display_name_template: "{{ user.name }}"
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```
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### [Google][google-idp]
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1. Set up a project in the Google API Console (see
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https://developers.google.com/identity/protocols/oauth2/openid-connect#appsetup).
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2. add an "OAuth Client ID" for a Web Application under "Credentials".
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3. Copy the Client ID and Client Secret, and add the following to your synapse config:
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```yaml
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oidc_config:
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enabled: true
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issuer: "https://accounts.google.com/"
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client_id: "your-client-id" # TO BE FILLED
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client_secret: "your-client-secret" # TO BE FILLED
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scopes: ["openid", "profile"]
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user_mapping_provider:
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config:
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localpart_template: "{{ user.given_name|lower }}"
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display_name_template: "{{ user.name }}"
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```
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4. Back in the Google console, add this Authorized redirect URI: `[synapse
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public baseurl]/_synapse/oidc/callback`.
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### Twitch
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1. Setup a developer account on [Twitch](https://dev.twitch.tv/)
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2. Obtain the OAuth 2.0 credentials by [creating an app](https://dev.twitch.tv/console/apps/)
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3. Add this OAuth Redirect URL: `[synapse public baseurl]/_synapse/oidc/callback`
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Synapse config:
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```yaml
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oidc_config:
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enabled: true
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issuer: "https://id.twitch.tv/oauth2/"
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client_id: "your-client-id" # TO BE FILLED
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client_secret: "your-client-secret" # TO BE FILLED
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client_auth_method: "client_secret_post"
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user_mapping_provider:
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config:
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localpart_template: '{{ user.preferred_username }}'
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display_name_template: '{{ user.name }}'
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```
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