Update deploy token package permissions

Include read_package in deploy token permissions
to allow mvn deploy to work with a write_package_registry
deploy token.

app/policies/group_policy.rb

@@ -194,6 +194,7 @@ class GroupPolicy < BasePolicy
 
   rule { write_package_registry_deploy_token }.policy do
     enable :create_package
+    enable :read_package
     enable :read_group
   end
 

app/policies/project_policy.rb

@@ -568,6 +568,7 @@ class ProjectPolicy < BasePolicy
 
   rule { write_package_registry_deploy_token }.policy do
     enable :create_package
+    enable :read_package
     enable :read_project
   end
 

changelogs/unreleased/282499-deploy-token-read-package.yml

+---
+title: Fix deploy token permissions for write_package_registry
+merge_request: 47675
+author:
+type: fixed

spec/policies/group_policy_spec.rb

@@ -876,6 +876,7 @@ RSpec.describe GroupPolicy do
       let(:deploy_token) { create(:deploy_token, :group, write_package_registry: true) }
 
       it { is_expected.to be_allowed(:create_package) }
+      it { is_expected.to be_allowed(:read_package) }
       it { is_expected.to be_allowed(:read_group) }
       it { is_expected.to be_disallowed(:destroy_package) }
     end

spec/policies/project_policy_spec.rb

@@ -697,6 +697,7 @@ RSpec.describe ProjectPolicy do
       let(:deploy_token) { create(:deploy_token, write_package_registry: true) }
 
       it { is_expected.to be_allowed(:create_package) }
+      it { is_expected.to be_allowed(:read_package) }
       it { is_expected.to be_allowed(:read_project) }
       it { is_expected.to be_disallowed(:destroy_package) }
     end

spec/requests/api/maven_packages_spec.rb

@@ -92,17 +92,32 @@ RSpec.describe API::MavenPackages do
   end
 
   shared_examples 'downloads with a deploy token' do
-    it 'allows download with deploy token' do
+    context 'successful download' do
+      subject do
         download_file(
           package_file.file_name,
           {},
           Gitlab::Auth::AuthFinders::DEPLOY_TOKEN_HEADER => deploy_token.token
         )
+      end
+
+      it 'allows download with deploy token' do
+        subject
+
+        expect(response).to have_gitlab_http_status(:ok)
+        expect(response.media_type).to eq('application/octet-stream')
+      end
+
+      it 'allows download with deploy token with only write_package_registry scope' do
+        deploy_token.update!(read_package_registry: false)
+
+        subject
 
         expect(response).to have_gitlab_http_status(:ok)
         expect(response.media_type).to eq('application/octet-stream')
       end
     end
+  end
 
   shared_examples 'downloads with a job token' do
     context 'with a running job' do
@@ -355,6 +370,15 @@ RSpec.describe API::MavenPackages do
           expect(response).to have_gitlab_http_status(:ok)
           expect(response.media_type).to eq('application/octet-stream')
         end
+
+        it 'returns the file with only write_package_registry scope' do
+          deploy_token_for_group.update!(read_package_registry: false)
+
+          subject
+
+          expect(response).to have_gitlab_http_status(:ok)
+          expect(response.media_type).to eq('application/octet-stream')
+        end
       end
     end