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163 lines
8.2 KiB
Markdown
163 lines
8.2 KiB
Markdown
# OpenID Connect (OIDC)
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GoToSocial supports [OpenID Connect](https://openid.net/connect/), which is an identification protocol built on top of [OAuth 2.0](https://oauth.net/2/), an industry standard protocol for authorization.
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This means that you can connect GoToSocial to an external OIDC provider like [Gitlab](https://docs.gitlab.com/ee/integration/openid_connect_provider.html), [Google](https://cloud.google.com/identity-platform/docs/web/oidc), [Keycloak](https://www.keycloak.org/), or [Dex](https://dexidp.io/) and allow users to sign in to GoToSocial using their credentials for that provider.
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This is very convenient in the following cases:
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- You're running multiple services on a platform (Matrix, Peertube, GoToSocial), and you want users to be able to use the same sign in page for all of them.
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- You want to delegate management of users, accounts, passwords etc. to an external service to make admin easier for yourself.
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- You already have a lot of users in an external system and you don't want to have to recreate them all in GoToSocial manually.
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## Settings
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GoToSocial exposes the following configuration settings for OIDC, shown below with their default values.
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```yaml
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#######################
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##### OIDC CONFIG #####
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#######################
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# Config for authentication with an external OIDC provider (Dex, Google, Auth0, etc).
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# Bool. Enable authentication with external OIDC provider. If set to true, then
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# the other OIDC options must be set as well. If this is set to false, then the standard
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# internal oauth flow will be used, where users sign in to GtS with username/password.
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# Options: [true, false]
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# Default: false
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oidc-enabled: false
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# String. Name of the oidc idp (identity provider). This will be shown to users when
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# they log in.
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# Examples: ["Google", "Dex", "Auth0"]
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# Default: ""
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oidc-idp-name: ""
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# Bool. Skip the normal verification flow of tokens returned from the OIDC provider, ie.,
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# don't check the expiry or signature. This should only be used in debugging or testing,
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# never ever in a production environment as it's extremely unsafe!
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# Options: [true, false]
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# Default: false
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oidc-skip-verification: false
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# String. The OIDC issuer URI. This is where GtS will redirect users to for login.
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# Typically this will look like a standard web URL.
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# Examples: ["https://auth.example.org", "https://example.org/auth"]
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# Default: ""
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oidc-issuer: ""
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# String. The ID for this client as registered with the OIDC provider.
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# Examples: ["some-client-id", "fda3772a-ad35-41c9-9a59-f1943ad18f54"]
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# Default: ""
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oidc-client-id: ""
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# String. The secret for this client as registered with the OIDC provider.
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# Examples: ["super-secret-business", "79379cf5-8057-426d-bb83-af504d98a7b0"]
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# Default: ""
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oidc-client-secret: ""
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# Array of string. Scopes to request from the OIDC provider. The returned values will be used to
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# populate users created in GtS as a result of the authentication flow. 'openid' and 'email' are required.
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# 'profile' is used to extract a username for the newly created user.
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# 'groups' is optional and can be used to determine if a user is an admin (if they're in the group 'admin' or 'admins').
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# Examples: See eg., https://auth0.com/docs/scopes/openid-connect-scopes
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# Default: ["openid", "email", "profile", "groups"]
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oidc-scopes:
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- "openid"
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- "email"
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- "profile"
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- "groups"
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```
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## Behavior
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When OIDC is enabled on GoToSocial, the default sign-in page redirects automatically to the sign-in page for the OIDC provider.
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This means that OIDC essentially *replaces* the normal GtS email/password sign-in flow.
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When a user logs in through OIDC, GoToSocial will request that user's preferred email address and username from the OIDC provider. It will then use the returned email address to either:
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*If the email address is already associated with a user/account*: sign the requester in as that user/account.
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Or:
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*If the email address is not yet associated with a user/account*: create a new user and account with the returned credentials, and sign the requester in as that user/account.
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In other words, GoToSocial completely delegates sign-in authority to the OIDC provider, and trusts whatever credentials it returns.
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### Username conflicts
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In some cases, such as when a server has been switched to use OIDC after already using default settings for a while, there may be an overlap between usernames returned from OIDC, and usernames that already existed in the database.
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For example, let's say that someone with username `gordonbrownfan` and email address `gordon_is_best@example.org` has an account on a GtS instance that uses the default sign-in flow.
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That GtS instance then switches to using OIDC login. However, in the OIDC's storage there's also a user with username `gordonbrownfan`. If this user has the email address `gordon_is_best@example.org`, then GoToSocial will assume that the two users are the same and just log `gordonbrownfan` in as though nothing had changed. No problem!
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However, if the user in the OIDC storage has a different email address, GoToSocial will try to create a new user and account for this person.
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Since the username `gordonbrownfan` is already taken, GoToSocial will try `gordonbrownfan1`. If this is also taken, it will try `gordonbrownfan2`, and so on, until it finds a username that's not yet taken. It will then sign the requester in as that user/account, distinct from the original `gordonbrownfan`.
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### Malformed usernames
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A username returned from an OIDC provider might not always fit the pattern of what GoToSocial accepts as a valid username, ie., lower-case letters, numbers, and underscores. In this case, GoToSocial will do its best to parse the returned username into something that fits the pattern.
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For example, say that an OIDC provider returns the username `Marx Is Great` for a sign in, which doesn't fit the pattern because it contains upper-case letters and spaces.
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In this case, GtS will convert it into `marx_is_great` by applying the following rules:
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1. Trim any leading or trailing whitespace.
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2. Convert all letters to lowercase.
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3. Replace spaces with underscores.
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Unfortunately, at this point GoToSocial doesn't know how to handle returned usernames containing special characters such as `@` or `%`, so these will return an error.
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### Group membership
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Most OIDC providers allow for the concept of groups and group memberships in returned claims. GoToSocial can use group membership to determine whether or not a user returned from an OIDC flow should be created as an admin account or not.
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If the returned OIDC groups information for a user contains membership of the groups `admin` or `admins`, then that user will be created/signed in as though they are an admin.
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## Provider Examples
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### Dex
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[Dex](https://dexidp.io/) is an open-source OIDC Provider that you can host yourself. The procedure for installing Dex is out of scope for this documentation, but you can check out the Dex docs [here](https://dexidp.io/docs/).
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Dex is great because it's also written in Go, like GoToSocial, which means it's small and fast and works well on lower-powered systems.
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To configure Dex and GoToSocial to work together, create the following client under the `staticClients` section of your Dex config:
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```yaml
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staticClients:
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- id: 'gotosocial_client'
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redirectURIs:
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- 'https://gotosocial.example.org/auth/callback'
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name: 'GoToSocial'
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secret: 'some-client-secret'
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```
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Make sure to replace `gotosocial_client` with your desired client ID, and `secret` with a reasonably long and secure secret (a UUID for example). You should also replace `gotosocial.example.org` with the `host` of your GtS instance, but leave `/auth/callback` in place.
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Now, edit the `oidc` section of your GoToSocial config.yaml as follows:
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```yaml
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oidc:
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enabled: true
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idpName: "Dex"
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skipVerification: false
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issuer: "https://auth.example.org"
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clientID: "gotosocial_client"
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clientSecret: "some-client-secret"
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scopes:
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- "openid"
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- "email"
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- "profile"
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- "groups"
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```
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Make sure to replace the `issuer` variable with whatever your Dex issuer is set to. This should be the exact URI at which your Dex instance can be reached.
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Now, restart both GoToSocial and Dex so that the new settings are in place.
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When you next go to log in to GtS, you should be redirected to the sign in page for Dex. On a successful sign in, you'll be directed back to GoToSocial.
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