159 lines
5.5 KiB
Markdown
159 lines
5.5 KiB
Markdown
# Okta SSO provider
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Okta is a [Single Sign-on provider](https://www.okta.com/products/single-sign-on/) that can be used to authenticate
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with GitLab.
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The following documentation enables Okta as a SAML provider.
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## Configure the Okta application
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1. On Okta go to the admin section and choose to **Add an App**.
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1. When the app screen comes up you see another button to **Create an App** and
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choose SAML 2.0 on the next screen.
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1. Now, very important, add a logo
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(you can choose it from <https://about.gitlab.com/press/>). You'll have to
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crop and resize it.
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1. Next, you'll need the to fill in the SAML general config. Here's an example
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image.
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1. The last part of the configuration is the feedback section where you can
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just say you're a customer and creating an app for internal use.
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1. When you have your app you'll have a few tabs on the top of the app's
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profile. Click on the SAML 2.0 config instructions button which should
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look like the following:
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1. On the screen that comes up take note of the
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**Identity Provider Single Sign-On URL** which you'll use for the
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`idp_sso_target_url` on your GitLab config file.
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1. **Before you leave Okta make sure you add your user and groups if any.**
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---
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Now that the Okta app is configured, it's time to enable it in GitLab.
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## Configure GitLab
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1. On your GitLab server, open the configuration file:
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**For Omnibus GitLab installations**
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```sh
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sudo editor /etc/gitlab/gitlab.rb
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```
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**For installations from source**
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```sh
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cd /home/git/gitlab
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sudo -u git -H editor config/gitlab.yml
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```
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1. See [Initial OmniAuth Configuration](../../integration/omniauth.md#initial-omniauth-configuration)
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for initial settings.
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1. To allow your users to use Okta to sign up without having to manually create
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an account first, don't forget to add the following values to your
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configuration:
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**For Omnibus GitLab installations**
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```ruby
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gitlab_rails['omniauth_allow_single_sign_on'] = ['saml']
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gitlab_rails['omniauth_block_auto_created_users'] = false
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```
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**For installations from source**
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```yaml
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allow_single_sign_on: ["saml"]
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block_auto_created_users: false
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```
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1. You can also automatically link Okta users with existing GitLab users if
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their email addresses match by adding the following setting:
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**For Omnibus GitLab installations**
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```ruby
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gitlab_rails['omniauth_auto_link_saml_user'] = true
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```
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**For installations from source**
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```yaml
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auto_link_saml_user: true
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```
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1. Add the provider configuration.
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>**Notes:**
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>
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>- Change the value for `assertion_consumer_service_url` to match the HTTPS endpoint
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of GitLab (append `users/auth/saml/callback` to the HTTPS URL of your GitLab
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installation to generate the correct value).
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>
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>- To get the `idp_cert_fingerprint` fingerprint, first download the
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certificate from the Okta app you registered and then run:
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`openssl x509 -in okta.cert -noout -fingerprint`. Substitute `okta.cert`
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with the location of your certificate.
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>
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>- Change the value of `idp_sso_target_url`, with the value of the
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**Identity Provider Single Sign-On URL** from the step when you
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configured the Okta app.
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>
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>- Change the value of `issuer` to the value of the **Audience Restriction** from your Okta app configuration. This will identify GitLab
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to the IdP.
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>
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>- Leave `name_identifier_format` as-is.
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**For Omnibus GitLab installations**
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```ruby
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gitlab_rails['omniauth_providers'] = [
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{
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name: 'saml',
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args: {
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assertion_consumer_service_url: 'https://gitlab.example.com/users/auth/saml/callback',
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idp_cert_fingerprint: '43:51:43:a1:b5:fc:8b:b7:0a:3a:a9:b1:0f:66:73:a8',
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idp_sso_target_url: 'https://gitlab.oktapreview.com/app/gitlabdev773716_gitlabsaml_1/exk8odl81tBrjpD4B0h7/sso/saml',
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issuer: 'https://gitlab.example.com',
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name_identifier_format: 'urn:oasis:names:tc:SAML:2.0:nameid-format:transient'
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},
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label: 'Okta' # optional label for SAML login button, defaults to "Saml"
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}
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]
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```
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**For installations from source**
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```yaml
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- {
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name: 'saml',
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args: {
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assertion_consumer_service_url: 'https://gitlab.example.com/users/auth/saml/callback',
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idp_cert_fingerprint: '43:51:43:a1:b5:fc:8b:b7:0a:3a:a9:b1:0f:66:73:a8',
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idp_sso_target_url: 'https://gitlab.oktapreview.com/app/gitlabdev773716_gitlabsaml_1/exk8odl81tBrjpD4B0h7/sso/saml',
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issuer: 'https://gitlab.example.com',
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name_identifier_format: 'urn:oasis:names:tc:SAML:2.0:nameid-format:transient'
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},
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label: 'Okta' # optional label for SAML login button, defaults to "Saml"
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}
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```
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1. [Reconfigure](../restart_gitlab.md#omnibus-gitlab-reconfigure) or [restart](../restart_gitlab.md#installations-from-source) GitLab for Omnibus and installations
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from source respectively for the changes to take effect.
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You might want to try this out on an incognito browser window.
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## Configuring groups
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>**Note:**
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Make sure the groups exist and are assigned to the Okta app.
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You can take a look of the [SAML documentation](../../integration/saml.md#marking-users-as-external-based-on-saml-groups) on external groups since
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it works the same.
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