Security - Filter attributes when creating user with Devise

My concern is about the possibility for a malicious user to add an extra parameter when he registers on my site. I'm using Rails 3.2.8 and Devise 2.1.2. I have a class User with an admin attribute


class User < ActiveRecord::Base
  devise :database_authenticatable, :registerable, :recoverable, :trackable,
     :validatable, :token_authenticatable, :lockable


create_table "users", :force => true do |t|
  t.boolean  "admin"
  t.string   "email",                                  :null => false
  t.string   "encrypted_password",     :default => "", :null => false
  # other devise columns are not relevant for the question...

I'm using the provided Devise::RegistrationsController for the registration of a User, and a custom view with email and password:

<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
  <%= devise_error_messages! %>

  <div class="form_line">
    <%= f.label :email, 'Email' %>
    <%= f.email_field :email %>
  <div class="form_line">
    <%= f.label :password, 'Password' %>
    <%= f.password_field :password %>
  <div class="form_line">
    <%= f.label :password_confirmation, 'Password confirmation' %>
    <%= f.password_field :password_confirmation %>

  <div class="actions">
    <%= f.submit "Register", class: 'button' %>
<% end %>

I works perfectly, but a if a malicious user adds a parameter admin with value true in the post request, the user is created with the admin privileges.

Started POST "/users" for at 2012-09-10 18:46:15 +0200
Processing by RegistrationsController#create as HTML
  Parameters: { "user"=>{"email"=>"", "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]", "admin"=>"true" }

That's a security weakness in my site. Can I configure Devise to ignore extra parameters (I need only email and password) when a user registers (or updates its profile, I think I'll have the same problem) ? If it's not possible, is there another solution ?


You need to protect the admin field from mass-assignment. You should add this to your model: attr_protected :admin

Read more here:

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