Configuration

The configuration of the @PLUGIN@ plugin is done in the gerrit.config file. auth.type must be set to OAUTH:

[auth]
  type = OAUTH

Providers are configured under @PLUGIN@ section, appended with provider suffix: e.g. -google-oauth or -github-oauth:

  [plugin "@PLUGIN@-google-oauth"]
    client-id = "<client-id>"
    client-secret = "<client-secret>"
    link-to-existing-openid-accounts = true

  [plugin "@PLUGIN@-github-oauth"]
    root-url = "<github url>" # https://github.com/ or https://git.company.com/
    client-id = "<client-id>"
    client-secret = "<client-secret>"

  [plugin "@PLUGIN@-cas-oauth"]
    root-url = "<cas url>"
    client-id = "<client-id>"
    client-secret = "<client-secret>"

  [plugin "@PLUGIN@-gitlab-oauth"]
    root-url = "<gitlab url>"
    client-id = "<client-id>"
    client-secret = "<client-secret>"

  [plugin "@PLUGIN@-dex-oauth"]
    domain = "<domain for username manipulation (optional)>"
    service-name = "<custom service name (optional)>"
    root-url = "<dex url>"
    client-id = "<client-id>"
    client-secret = "<client-secret>"

  [plugin "@PLUGIN@-airvantage-oauth"]
    client-id = "<client-id>"
    client-secret = "<client-secret>"

  [plugin "@PLUGIN@-phabricator-oauth"]
    client-id = "<client-id>"
    client-secret = "<client-secret>"
    root-url = "<phabricator url>"

  [plugin "@PLUGIN@-office365-oauth"]
    client-id = "<client-id>"
    client-secret = "<client-secret>"
    tenant = "<tenant (optional defaults to organizations if not set)>"

When one from the sections above is omitted, OAuth SSO is used. The login form with provider selection isn’t shown. When all sections are omitted, Gerrit will not start.

Google OAuth provider seamlessly supports linking of OAuth identity to existing OpenID accounts. This feature is deactivated by default. To activate it, add

plugin.gerrit-oauth-provider-google-oauth.link-to-existing-openid-accounts = true

to Google OAuth configuration section.

It is possile to restrict sign-in to accounts of one or more (hosted) domains for Google OAuth. Multiple domain options can be added:

plugin.gerrit-oauth-provider-google-oauth.domain = "mycollege.edu"
plugin.gerrit-oauth-provider-google-oauth.domain = "myschool.net"

(See the spec)[https://developers.google.com/identity/protocols/OpenIDConnect#hd-param] for more information. To protect against client-side request modification, the returned ID token is checked to contain a matching hd claim (which is proof the account does belong to the hosted domain). If the hd claim wasn‘t included in ID token or didn’t match the provided domain configuration option the authentication is rejected. Note: Because of current limitation of the OAuth extension point in gerrit (blame /me for that) the user would only see “Unauthorized” message.

By default the Google OAuth provider will not set a username (used for ssh) and the user can choose one from the web ui (needed before using ssh). It is possible to automatically use the user part from the google apps email. This is deactivated by default. To activate it, add:

plugin.gerrit-oauth-provider-google-oauth.use-email-as-username = true

Note: the usernames are unique in gerrit. If a username already exists this will be ignored and the user will have to choose a different one from the web ui.

CAS OAuth

For CAS OAuth setting

plugin.gerrit-oauth-provider-cas-oauth.root-url = "https://example.com/cas"

is required, since CAS is a self-hosted application.

Note that the CAS OAuth plugin only supports CAS V5 and higher.

The plugin expects CAS to make several attributes available to it:

Name	Description	Required
id	External ID	yes
login	Login name	no
email	Email address	no
name	Display name	no

CoreOS Dex OAuth

For Dex OAuth setting

plugin.gerrit-oauth-provider-dex-oauth.root-url = "https://example.com"

is required, since Dex is a self-hosted application.

Obtaining provider authorizations

Google

To obtain client-id and client-secret for Google OAuth, go to Google Developers Console:

• Create a project

  

• Go inside the created project

• In “APIs & auth”/“Credentials” select “Create new Client ID” and create Client ID for a Web application

  

• Enter additional information about the project, which will be presented to user during the authentication process

  

• Specify authorized redirect URL: <canonical-web-uri-of-gerrit>/oauth

  

After the final step, the page will show generated client id and secret.

GitHub

To obtain client-id and client-secret for GitHub OAuth, go to Applications settings in your GitHub account:

• Select “Register new application” and enter information about the application.

  Note that it is important that authorization callback URL points to <canonical-web-uri-of-gerrit>/oauth.

  

After application is registered, the page will show generated client id and secret.

CAS

The client-id and client-secret for CAS OAuth are part of the CAS service definition and need to be set manually.

See the CAS documentation for an example.

GitLab

To obtain client-id and client-secret for GitLab OAuth, go to Applications settings in your GitLab profile:

• Select “Save application” and enter information about the application.

  Note that it is important that Redirect URI points to <canonical-web-uri-of-gerrit>/oauth.

  

After application is saved, the page will show generated client id and secret.

CoreOS Dex

The client-id and client-secret for Dex OAuth are part of the Dex setup and need to be set manually.

See Using Dex for an example.

AirVantage

The client-id and client-secret for AirVantage OAuth can be obtained by registering a Client application. See Getting Started.

Phabricator

The client-id and client-secret for Phabricator can be obtained by registering a Client application. See Using the Phabricator OAuth Server.

Office365

The client-id and client-secret for Office365/Azure can be obtained by registering a new application, see OAuth 2.0 and OpenID Connect protocols on Microsoft identity platform.

####Username By default Office365 OAuth will not set a username (used for ssh) and the user can choose one from the web ui (needed before using ssh). To automatically set the user part from the email the option use-email-as-username can be used.

plugin.gerrit-oauth-provider-office365-oauth.use-email-as-username = true

####Tenant The Gerrit OAuth plugin is default set to use the tenant organizations but a specific tenant can be used by the option tenant. If a tenant other than common, organizations or consumers is used then the tokens will be validated that they are originating from the same tenant that is configured in the Gerrit OAuth plugin. See [https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-protocols-oidc#fetch-the-openid-connect-metadata-document](Microsoft identity platform and OpenID Connect protocol)

plugin.gerrit-oauth-provider-office365-oauth.tenant = <tenant to use>

Regardless of tenant all tokens will be checked that they contain the client_id set in the Gerrit OAuth plugin.