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---
stage: Create
group: Ecosystem
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
---
# CAS OmniAuth Provider **(FREE)**
To enable the CAS OmniAuth provider you must register your application with your CAS instance. This requires the service URL GitLab supplies to CAS. It should be something like: `https://gitlab.example.com:443/users/auth/cas3/callback?url`. By default handling for SLO is enabled, you only need to configure CAS for back-channel logout.
1. On your GitLab server, open the configuration file.
For Omnibus package:
```shell
sudo editor /etc/gitlab/gitlab.rb
```
For installations from source:
```shell
cd /home/git/gitlab
sudo -u git -H editor config/gitlab.yml
```
1. See [Initial OmniAuth Configuration](omniauth.md#initial-omniauth-configuration) for initial settings.
1. Add the provider configuration:
For Omnibus package:
```ruby
gitlab_rails['omniauth_providers'] = [
{
"name"=> "cas3",
"label"=> "cas",
"args"=> {
"url"=> 'CAS_SERVER',
"login_url"=> '/CAS_PATH/login',
"service_validate_url"=> '/CAS_PATH/p3/serviceValidate',
"logout_url"=> '/CAS_PATH/logout'
}
}
]
```
For installations from source:
```yaml
- { name: 'cas3',
label: 'cas',
args: {
url: 'CAS_SERVER',
login_url: '/CAS_PATH/login',
service_validate_url: '/CAS_PATH/p3/serviceValidate',
logout_url: '/CAS_PATH/logout' } }
```
1. Change 'CAS_PATH' to the root of your CAS instance (such as `cas`).
1. If your CAS instance does not use default TGC lifetimes, update the `cas3.session_duration` to at least the current TGC maximum lifetime. To explicitly disable SLO, regardless of CAS settings, set this to 0.
1. Save the configuration file.
1. [Reconfigure](../administration/restart_gitlab.md#omnibus-gitlab-reconfigure) or
[restart GitLab](../administration/restart_gitlab.md#installations-from-source) for the changes to
take effect if you installed GitLab via Omnibus or from source respectively.
On the sign in page there should now be a CAS tab in the sign in form.
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