Add groups to OpenID Connect claims

app/models/user.rb

@@ -564,7 +564,7 @@ class User < ActiveRecord::Base
     gpg_keys.each(&:update_invalid_gpg_signatures)
   end
 
-  # Returns the groups a user has access to
+  # Returns the groups a user has access to, either through a membership or a project authorization
   def authorized_groups
     union = Gitlab::SQL::Union
       .new([groups.select(:id), authorized_projects.select(:namespace_id)])
@@ -572,6 +572,11 @@ class User < ActiveRecord::Base
     Group.where("namespaces.id IN (#{union.to_sql})") # rubocop:disable GitlabSecurity/SqlInjection
   end
 
+  # Returns the groups a user is a member of, either directly or through a parent group
+  def membership_groups
+    Gitlab::GroupHierarchy.new(groups).base_and_descendants
+  end
+
   # Returns a relation of groups the user has access to, including their parent
   # and child groups (recursively).
   def all_expanded_groups

changelogs/unreleased/feature-oidc-groups-claim.yml

+---
+title: Add groups to OpenID Connect claims
+merge_request: 16929
+author: Hassan Zamani

config/initializers/doorkeeper_openid_connect.rb

@@ -31,6 +31,7 @@ Doorkeeper::OpenidConnect.configure do
       o.claim(:website)        { |user| user.full_website_url if user.website_url? }
       o.claim(:profile)        { |user| Gitlab::Routing.url_helpers.user_url user }
       o.claim(:picture)        { |user| user.avatar_url(only_path: false) }
+      o.claim(:groups)         { |user| user.membership_groups.map(&:full_path) }
     end
   end
 end

config/locales/doorkeeper.en.yml

@@ -68,7 +68,7 @@ en:
       read_user:
         Read-only access to the user's profile information, like username, public email and full name
       openid:
-        The ability to authenticate using GitLab, and read-only access to the user's profile information
+        The ability to authenticate using GitLab, and read-only access to the user's profile information and group memberships
       sudo:
         Access to the Sudo feature, to perform API actions as any user in the system (only available for admins)
     flash:

doc/integration/openid_connect_provider.md

@@ -39,6 +39,7 @@ Currently the following user information is shared with clients:
 | `website`        | `string`  | URL for the user's website
 | `profile`        | `string`  | URL for the user's GitLab profile
 | `picture`        | `string`  | URL for the user's GitLab avatar
+| `groups`         | `array`   | Names of the groups the user is a member of
 
 [OpenID Connect]: http://openid.net/connect/ "OpenID Connect website"
 [doorkeeper-openid_connect]: https://github.com/doorkeeper-gem/doorkeeper-openid_connect "Doorkeeper::OpenidConnect website"

spec/models/user_spec.rb

@@ -1557,14 +1557,37 @@ describe User do
   describe '#authorized_groups' do
     let!(:user) { create(:user) }
     let!(:private_group) { create(:group) }
+    let!(:child_group) { create(:group, parent: private_group) }
+
+    let!(:project_group) { create(:group) }
+    let!(:project) { create(:project, group: project_group) }
 
     before do
       private_group.add_user(user, Gitlab::Access::MASTER)
+      project.add_master(user)
     end
 
     subject { user.authorized_groups }
 
-    it { is_expected.to eq([private_group]) }
+    it { is_expected.to contain_exactly private_group, project_group }
+  end
+
+  describe '#membership_groups' do
+    let!(:user) { create(:user) }
+    let!(:parent_group) { create(:group) }
+    let!(:child_group) { create(:group, parent: parent_group) }
+
+    before do
+      parent_group.add_user(user, Gitlab::Access::MASTER)
+    end
+
+    subject { user.membership_groups }
+
+    if Group.supports_nested_groups?
+      it { is_expected.to contain_exactly parent_group, child_group }
+    else
+      it { is_expected.to contain_exactly parent_group }
+    end
   end
 
   describe '#authorized_projects', :delete do

spec/requests/openid_connect_spec.rb

@@ -65,10 +65,20 @@ describe 'OpenID Connect requests' do
         )
       end
 
-      let(:public_email) { build :email, email: 'public@example.com' }
-      let(:private_email) { build :email, email: 'private@example.com' }
+      let!(:public_email) { build :email, email: 'public@example.com' }
+      let!(:private_email) { build :email, email: 'private@example.com' }
 
-      it 'includes all user information' do
+      let!(:group1) { create :group, path: 'group1' }
+      let!(:group2) { create :group, path: 'group2' }
+      let!(:group3) { create :group, path: 'group3', parent: group2 }
+      let!(:group4) { create :group, path: 'group4', parent: group3 }
+
+      before do
+        group1.add_user(user, GroupMember::OWNER)
+        group3.add_user(user, Gitlab::Access::DEVELOPER)
+      end
+
+      it 'includes all user information and group memberships' do
         request_user_info
 
         expect(json_response).to eq({
@@ -79,7 +89,13 @@ describe 'OpenID Connect requests' do
           'email_verified' => true,
           'website'        => 'https://example.com',
           'profile'        => 'http://localhost/alice',
-          'picture'        => "http://localhost/uploads/-/system/user/avatar/#{user.id}/dk.png"
+          'picture'        => "http://localhost/uploads/-/system/user/avatar/#{user.id}/dk.png",
+          'groups'         =>
+            if Group.supports_nested_groups?
+              ['group1', 'group2/group3', 'group2/group3/group4']
+            else
+              ['group1', 'group2/group3']
+            end
         })
       end
     end