Don't display the `is_admin?` flag for user API responses.

- To prevent an attacker from enumerating the `/users` API to get a list of all
  the admins.

- Display the `is_admin?` flag wherever we display the `private_token` - at the
  moment, there are two instances:

  - When an admin uses `sudo` to view the `/user` endpoint
  - When logging in using the `/session` endpoint

3 files changed, 5 insertions, 5 deletions

diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index 64ab6f01eb5..6d6ccefe877 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -14,7 +14,6 @@ module API
 
     class User < UserBasic
       expose :created_at
-      expose :admin?, as: :is_admin
       expose :bio, :location, :skype, :linkedin, :twitter, :website_url, :organization
     end
 
@@ -41,8 +40,9 @@ module API
       expose :external
     end
 
-    class UserWithPrivateToken < UserPublic
+    class UserWithPrivateDetails < UserPublic
       expose :private_token
+      expose :admin?, as: :is_admin
     end
 
     class Email < Grape::Entity
diff --git a/lib/api/session.rb b/lib/api/session.rb
index 002ffd1d154..016415c3023 100644
--- a/lib/api/session.rb
+++ b/lib/api/session.rb
@@ -1,7 +1,7 @@
 module API
   class Session < Grape::API
     desc 'Login to get token' do
-      success Entities::UserWithPrivateToken
+      success Entities::UserWithPrivateDetails
     end
     params do
       optional :login, type: String, desc: 'The username'
@@ -14,7 +14,7 @@ module API
 
       return unauthorized! unless user
       return render_api_error!('401 Unauthorized. You have 2FA enabled. Please use a personal access token to access the API', 401) if user.two_factor_enabled?
-      present user, with: Entities::UserWithPrivateToken
+      present user, with: Entities::UserWithPrivateDetails
     end
   end
 end
diff --git a/lib/api/users.rb b/lib/api/users.rb
index 46f221f68fe..40acaebf670 100644
--- a/lib/api/users.rb
+++ b/lib/api/users.rb
@@ -433,7 +433,7 @@ module API
         success Entities::UserPublic
       end
       get do
-        present current_user, with: sudo? ? Entities::UserWithPrivateToken : Entities::UserPublic
+        present current_user, with: sudo? ? Entities::UserWithPrivateDetails : Entities::UserPublic
       end
 
       desc "Get the currently authenticated user's SSH keys" do