140 lines
5.6 KiB
Markdown
140 lines
5.6 KiB
Markdown
# Shibboleth OmniAuth Provider
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This documentation is for enabling shibboleth with omnibus-gitlab package.
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In order to enable Shibboleth support in gitlab we need to use Apache instead of Nginx (It may be possible to use Nginx, however this is difficult to configure using the bundled Nginx provided in the omnibus-gitlab package). Apache uses mod_shib2 module for shibboleth authentication and can pass attributes as headers to omniauth-shibboleth provider.
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To enable the Shibboleth OmniAuth provider you must configure Apache shibboleth module.
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Installation and configuration of module it self is out of scope of this document.
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Check <https://wiki.shibboleth.net/> for more info.
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You can find Apache config in gitlab-recipes (<https://gitlab.com/gitlab-org/gitlab-recipes/tree/master/web-server/apache>).
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The following changes are needed to enable Shibboleth:
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1. Protect omniauth-shibboleth callback URL:
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```
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<Location /users/auth/shibboleth/callback>
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AuthType shibboleth
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ShibRequestSetting requireSession 1
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ShibUseHeaders On
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require valid-user
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</Location>
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Alias /shibboleth-sp /usr/share/shibboleth
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<Location /shibboleth-sp>
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Satisfy any
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</Location>
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<Location /Shibboleth.sso>
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SetHandler shib
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</Location>
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```
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1. Exclude shibboleth URLs from rewriting. Add `RewriteCond %{REQUEST_URI} !/Shibboleth.sso` and `RewriteCond %{REQUEST_URI} !/shibboleth-sp`. Config should look like this:
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```
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# Apache equivalent of Nginx try files
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RewriteEngine on
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RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f
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RewriteCond %{REQUEST_URI} !/Shibboleth.sso
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RewriteCond %{REQUEST_URI} !/shibboleth-sp
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RewriteRule .* http://127.0.0.1:8080%{REQUEST_URI} [P,QSA]
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RequestHeader set X_FORWARDED_PROTO 'https'
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```
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1. Edit `/etc/gitlab/gitlab.rb` configuration file to enable OmniAuth and add
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Shibboleth as an OmniAuth provider. User attributes will be sent from the
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Apache reverse proxy to GitLab as headers with the names from the Shibboleth
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attribute mapping. Therefore the values of the `args` hash
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should be in the form of `"HTTP_ATTRIBUTE"`. The keys in the hash are arguments
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to the [OmniAuth::Strategies::Shibboleth class](https://github.com/toyokazu/omniauth-shibboleth/blob/master/lib/omniauth/strategies/shibboleth.rb)
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and are documented by the [omniauth-shibboleth gem](https://github.com/toyokazu/omniauth-shibboleth)
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(take care to note the version of the gem packaged with GitLab). If some of
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your users appear to be authenticated by Shibboleth and Apache, but GitLab
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rejects their account with a URI that contains "e-mail is invalid" then your
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Shibboleth Identity Provider or Attribute Authority may be asserting multiple
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e-mail addresses. In this instance, you might consider setting the
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`multi_values` argument to `first`.
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The file should look like this:
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```
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external_url 'https://gitlab.example.com'
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gitlab_rails['internal_api_url'] = 'https://gitlab.example.com'
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# disable Nginx
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nginx['enable'] = false
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gitlab_rails['omniauth_allow_single_sign_on'] = true
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gitlab_rails['omniauth_block_auto_created_users'] = false
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gitlab_rails['omniauth_enabled'] = true
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gitlab_rails['omniauth_providers'] = [
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{
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"name" => "'shibboleth"',
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"label" => "Text for Login Button",
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"args" => {
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"shib_session_id_field" => "HTTP_SHIB_SESSION_ID",
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"shib_application_id_field" => "HTTP_SHIB_APPLICATION_ID",
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"uid_field" => 'HTTP_EPPN',
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"name_field" => 'HTTP_CN',
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"info_fields" => { "email" => 'HTTP_MAIL'}
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}
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}
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]
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```
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1. [Reconfigure](../administration/restart_gitlab.md#omnibus-gitlab-reconfigure) or [restart](../administration/restart_gitlab.md#installations-from-source) GitLab for the changes to take effect if you
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installed GitLab via Omnibus or from source respectively.
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On the sign in page, there should now be a "Sign in with: Shibboleth" icon below the regular sign in form. Click the icon to begin the authentication process. You will be redirected to IdP server (depends on your Shibboleth module configuration). If everything goes well the user will be returned to GitLab and will be signed in.
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## Apache 2.4 / GitLab 8.6 update
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The order of the first 2 Location directives is important. If they are reversed,
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you will not get a shibboleth session!
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```
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<Location />
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Require all granted
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ProxyPassReverse http://127.0.0.1:8181
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ProxyPassReverse http://YOUR_SERVER_FQDN/
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</Location>
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<Location /users/auth/shibboleth/callback>
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AuthType shibboleth
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ShibRequestSetting requireSession 1
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ShibUseHeaders On
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Require shib-session
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</Location>
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Alias /shibboleth-sp /usr/share/shibboleth
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<Location /shibboleth-sp>
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Require all granted
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</Location>
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<Location /Shibboleth.sso>
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SetHandler shib
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</Location>
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RewriteEngine on
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#Don't escape encoded characters in api requests
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RewriteCond %{REQUEST_URI} ^/api/v4/.*
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RewriteCond %{REQUEST_URI} !/Shibboleth.sso
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RewriteCond %{REQUEST_URI} !/shibboleth-sp
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RewriteRule .* http://127.0.0.1:8181%{REQUEST_URI} [P,QSA,NE]
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#Forward all requests to gitlab-workhorse except existing files
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RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f [OR]
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RewriteCond %{REQUEST_URI} ^/uploads/.*
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RewriteCond %{REQUEST_URI} !/Shibboleth.sso
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RewriteCond %{REQUEST_URI} !/shibboleth-sp
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RewriteRule .* http://127.0.0.1:8181%{REQUEST_URI} [P,QSA]
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RequestHeader set X_FORWARDED_PROTO 'https'
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RequestHeader set X-Forwarded-Ssl on
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```
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