Require a fresh second factor for user management

Administrative actions are gated behind a 30-minute elevation window:
creating and retiring accounts, editing roles, clearing a second factor.
Reading the list is not gated, and content work is untouched.

elevated? is tied to is_admin?, so losing the role closes the window at
once. The window opens when the second factor verifies at login, so an
admin heading straight for user management is already elevated, and closes
on logout with the other session state. Five wrong codes end the session,
mirroring the login challenge.

users#update carries no elevation filter, since self-service reaches it;
the role field is gated in user_params instead and fails closed.

1 files changed, 9 insertions, 0 deletions

diff --git a/app/controllers/concerns/role_required.rb b/app/controllers/concerns/role_required.rb
index b841b8cc..22ce625e 100644
--- a/app/controllers/concerns/role_required.rb
+++ b/app/controllers/concerns/role_required.rb
@@ -20,4 +20,13 @@ module RoleRequired
       flash[:error] = t("flash.common.#{key}")
       redirect_to admin_path
     end
+
+    # require_admin must precede this in the filter chain, so a non-admin is
+    # denied by role before elevation is ever considered.
+    def require_elevation
+      return if elevated?
+
+      session[:elevation_return_to] = request.fullpath
+      redirect_to new_elevation_path
+    end
 end