mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-25 18:56:13 +03:00
0884f89431
* start pulling out + replacing urfave and config * replace many many instances of config * move more stuff => viper * properly remove urfave * move some flags to root command * add testrig commands to root * alias config file keys * start adding cli parsing tests * reorder viper init * remove config path alias * fmt * change config file keys to non-nested * we're more or less in business now * tidy up the common func * go fmt * get tests passing again * add note about the cliparsing tests * reorganize * update docs with changes * structure cmd dir better * rename + move some files around * fix dangling comma
163 lines
8.2 KiB
Markdown
163 lines
8.2 KiB
Markdown
# OpenID Connect (OIDC)
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
This is very convenient in the following cases:
|
|
|
|
- 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.
|
|
- You want to delegate management of users, accounts, passwords etc. to an external service to make admin easier for yourself.
|
|
- 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.
|
|
|
|
## Settings
|
|
|
|
GoToSocial exposes the following configuration settings for OIDC, shown below with their default values.
|
|
|
|
```yaml
|
|
#######################
|
|
##### OIDC CONFIG #####
|
|
#######################
|
|
|
|
# Config for authentication with an external OIDC provider (Dex, Google, Auth0, etc).
|
|
|
|
# Bool. Enable authentication with external OIDC provider. If set to true, then
|
|
# the other OIDC options must be set as well. If this is set to false, then the standard
|
|
# internal oauth flow will be used, where users sign in to GtS with username/password.
|
|
# Options: [true, false]
|
|
# Default: false
|
|
oidc-enabled: false
|
|
|
|
# String. Name of the oidc idp (identity provider). This will be shown to users when
|
|
# they log in.
|
|
# Examples: ["Google", "Dex", "Auth0"]
|
|
# Default: ""
|
|
oidc-idp-name: ""
|
|
|
|
# Bool. Skip the normal verification flow of tokens returned from the OIDC provider, ie.,
|
|
# don't check the expiry or signature. This should only be used in debugging or testing,
|
|
# never ever in a production environment as it's extremely unsafe!
|
|
# Options: [true, false]
|
|
# Default: false
|
|
oidc-skip-verification: false
|
|
|
|
# String. The OIDC issuer URI. This is where GtS will redirect users to for login.
|
|
# Typically this will look like a standard web URL.
|
|
# Examples: ["https://auth.example.org", "https://example.org/auth"]
|
|
# Default: ""
|
|
oidc-issuer: ""
|
|
|
|
# String. The ID for this client as registered with the OIDC provider.
|
|
# Examples: ["some-client-id", "fda3772a-ad35-41c9-9a59-f1943ad18f54"]
|
|
# Default: ""
|
|
oidc-client-id: ""
|
|
|
|
# String. The secret for this client as registered with the OIDC provider.
|
|
# Examples: ["super-secret-business", "79379cf5-8057-426d-bb83-af504d98a7b0"]
|
|
# Default: ""
|
|
oidc-client-secret: ""
|
|
|
|
# Array of string. Scopes to request from the OIDC provider. The returned values will be used to
|
|
# populate users created in GtS as a result of the authentication flow. 'openid' and 'email' are required.
|
|
# 'profile' is used to extract a username for the newly created user.
|
|
# 'groups' is optional and can be used to determine if a user is an admin (if they're in the group 'admin' or 'admins').
|
|
# Examples: See eg., https://auth0.com/docs/scopes/openid-connect-scopes
|
|
# Default: ["openid", "email", "profile", "groups"]
|
|
oidc-scopes:
|
|
- "openid"
|
|
- "email"
|
|
- "profile"
|
|
- "groups"
|
|
```
|
|
|
|
## Behavior
|
|
|
|
When OIDC is enabled on GoToSocial, the default sign-in page redirects automatically to the sign-in page for the OIDC provider.
|
|
|
|
This means that OIDC essentially *replaces* the normal GtS email/password sign-in flow.
|
|
|
|
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:
|
|
|
|
*If the email address is already associated with a user/account*: sign the requester in as that user/account.
|
|
|
|
Or:
|
|
|
|
*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.
|
|
|
|
In other words, GoToSocial completely delegates sign-in authority to the OIDC provider, and trusts whatever credentials it returns.
|
|
|
|
### Username conflicts
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
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!
|
|
|
|
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.
|
|
|
|
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`.
|
|
|
|
### Malformed usernames
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
In this case, GtS will convert it into `marx_is_great` by applying the following rules:
|
|
|
|
1. Trim any leading or trailing whitespace.
|
|
2. Convert all letters to lowercase.
|
|
3. Replace spaces with underscores.
|
|
|
|
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.
|
|
|
|
### Group membership
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
## Provider Examples
|
|
|
|
### Dex
|
|
|
|
[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/).
|
|
|
|
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.
|
|
|
|
To configure Dex and GoToSocial to work together, create the following client under the `staticClients` section of your Dex config:
|
|
|
|
```yaml
|
|
staticClients:
|
|
- id: 'gotosocial_client'
|
|
redirectURIs:
|
|
- 'https://gotosocial.example.org/auth/callback'
|
|
name: 'GoToSocial'
|
|
secret: 'some-client-secret'
|
|
```
|
|
|
|
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.
|
|
|
|
Now, edit the `oidc` section of your GoToSocial config.yaml as follows:
|
|
|
|
```yaml
|
|
oidc:
|
|
enabled: true
|
|
idpName: "Dex"
|
|
skipVerification: false
|
|
issuer: "https://auth.example.org"
|
|
clientID: "gotosocial_client"
|
|
clientSecret: "some-client-secret"
|
|
scopes:
|
|
- "openid"
|
|
- "email"
|
|
- "profile"
|
|
- "groups"
|
|
```
|
|
|
|
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.
|
|
|
|
Now, restart both GoToSocial and Dex so that the new settings are in place.
|
|
|
|
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.
|