Secure vulerability and add specs

app/policies/group_policy.rb

@@ -47,7 +47,6 @@ class GroupPolicy < BasePolicy
   rule { admin }             .enable :read_group
   rule { has_projects }.policy do
-    enable :read_group
     enable :read_label
   end

changelogs/unreleased/security-shared-project-private-group.yml

+---
+title: Fixed ability to see private groups by users not belonging to given group
+merge_request:
+author:
+type: security

spec/controllers/projects/group_links_controller_spec.rb

@@ -85,6 +85,7 @@ describe Projects::GroupLinksController do
                       project_id: project,
                       link_group_id: group2.id,
                       link_group_access: ProjectGroupLink.default_access)
+
       end
       it 'does not share project with selected group' do

spec/features/security/group/private_access_spec.rb

@@ -27,7 +27,7 @@ describe 'Private Group access' do
     it { is_expected.to be_allowed_for(:developer).of(group) }
     it { is_expected.to be_allowed_for(:reporter).of(group) }
     it { is_expected.to be_allowed_for(:guest).of(group) }
-    it { is_expected.to be_allowed_for(project_guest) }
+    it { is_expected.to be_denied_for(project_guest) }
     it { is_expected.to be_denied_for(:user) }
     it { is_expected.to be_denied_for(:external) }
     it { is_expected.to be_denied_for(:visitor) }
@@ -42,7 +42,7 @@ describe 'Private Group access' do
     it { is_expected.to be_allowed_for(:developer).of(group) }
     it { is_expected.to be_allowed_for(:reporter).of(group) }
     it { is_expected.to be_allowed_for(:guest).of(group) }
-    it { is_expected.to be_allowed_for(project_guest) }
+    it { is_expected.to be_denied_for(project_guest) }
     it { is_expected.to be_denied_for(:user) }
     it { is_expected.to be_denied_for(:external) }
     it { is_expected.to be_denied_for(:visitor) }
@@ -58,7 +58,7 @@ describe 'Private Group access' do
     it { is_expected.to be_allowed_for(:developer).of(group) }
     it { is_expected.to be_allowed_for(:reporter).of(group) }
     it { is_expected.to be_allowed_for(:guest).of(group) }
-    it { is_expected.to be_allowed_for(project_guest) }
+    it { is_expected.to be_denied_for(project_guest) }
     it { is_expected.to be_denied_for(:user) }
     it { is_expected.to be_denied_for(:external) }
     it { is_expected.to be_denied_for(:visitor) }
@@ -73,7 +73,7 @@ describe 'Private Group access' do
     it { is_expected.to be_allowed_for(:developer).of(group) }
     it { is_expected.to be_allowed_for(:reporter).of(group) }
     it { is_expected.to be_allowed_for(:guest).of(group) }
-    it { is_expected.to be_allowed_for(project_guest) }
+    it { is_expected.to be_denied_for(project_guest) }
     it { is_expected.to be_denied_for(:user) }
     it { is_expected.to be_denied_for(:external) }
     it { is_expected.to be_denied_for(:visitor) }
@@ -93,4 +93,28 @@ describe 'Private Group access' do
     it { is_expected.to be_denied_for(:visitor) }
     it { is_expected.to be_denied_for(:external) }
   end
+
+  describe 'GET /groups/:path for shared projects' do
+    let(:project) { create(:project, :public) }
+    before do
+      Projects::GroupLinks::CreateService.new(
+        project,
+        create(:user),
+        link_group_access: ProjectGroupLink::DEVELOPER
+      ).execute(group)
+    end
+
+    subject { group_path(group) }
+
+    it { is_expected.to be_allowed_for(:admin) }
+    it { is_expected.to be_allowed_for(:owner).of(group) }
+    it { is_expected.to be_allowed_for(:maintainer).of(group) }
+    it { is_expected.to be_allowed_for(:developer).of(group) }
+    it { is_expected.to be_allowed_for(:reporter).of(group) }
+    it { is_expected.to be_allowed_for(:guest).of(group) }
+    it { is_expected.to be_denied_for(project_guest) }
+    it { is_expected.to be_denied_for(:user) }
+    it { is_expected.to be_denied_for(:external) }
+    it { is_expected.to be_denied_for(:visitor) }
+  end
 end

spec/policies/group_policy_spec.rb

@@ -73,6 +73,38 @@ describe GroupPolicy do
     end
   end
+  context 'with no user and public project' do
+    let(:project) { create(:project, :public) }
+    let(:user) { create(:user) }
+    let(:current_user) { nil }
+
+    before do
+      Projects::GroupLinks::CreateService.new(
+        project,
+        user,
+        link_group_access: ProjectGroupLink::DEVELOPER
+      ).execute(group)
+    end
+
+    it { expect_disallowed(:read_group) }
+  end
+
+  context 'with foreign user and public project' do
+    let(:project) { create(:project, :public) }
+    let(:user) { create(:user) }
+    let(:current_user) { create(:user) }
+
+    before do
+      Projects::GroupLinks::CreateService.new(
+        project,
+        user,
+        link_group_access: ProjectGroupLink::DEVELOPER
+      ).execute(group)
+    end
+
+    it { expect_disallowed(:read_group) }
+  end
+
   context 'has projects' do
     let(:current_user) { create(:user) }
     let(:project) { create(:project, namespace: group) }
@@ -81,17 +113,13 @@ describe GroupPolicy do
       project.add_developer(current_user)
     end
-    it do
-      expect_allowed(:read_group, :read_label)
-    end
+    it { expect_allowed(:read_label) }
     context 'in subgroups', :nested_groups do
       let(:subgroup) { create(:group, :private, parent: group) }
       let(:project) { create(:project, namespace: subgroup) }
-      it do
-        expect_allowed(:read_group, :read_label)
-      end
+      it { expect_allowed(:read_label) }
     end
   end