more protection against mass assignment

app/models/cost_type.rb

@@ -8,6 +8,8 @@ class CostType < ActiveRecord::Base
 
   after_update :save_rates
 
+  attr_accessible :name, :unit, :unit_plural, :default, :new_rate_attributes
+
   named_scope :active, :conditions => { :deleted_at => nil }
 
   # finds the default CostType

app/models/group_user.rb

@@ -4,6 +4,8 @@ class GroupUser < ActiveRecord::Base
   belongs_to :user
   belongs_to :group
 
+  attr_accessible :user, :group, :membership_type
+  
   MEMBERSHIP_TYPES = %w(default controller)
   DEFAULT_MEMBERSHIP_TYPE = :default
   

app/models/labor_budget_item.rb

@@ -5,6 +5,7 @@ class LaborBudgetItem < ActiveRecord::Base
   validates_length_of :comments, :maximum => 255, :allow_nil => true
   validates_presence_of :user
 
+  # user_id correctness is ensured in VariableCostObject#*_labor_budget_item_attributes=
   attr_accessible :hours, :comments, :budget, :user_id
 
   def costs

app/models/material_budget_item.rb

@@ -5,7 +5,7 @@ class MaterialBudgetItem < ActiveRecord::Base
   validates_length_of :comments, :maximum => 255, :allow_nil => true
   validates_presence_of :cost_type
 
-  attr_accessible :units, :comments, :budget, :cost_type_id
+  attr_accessible :units, :comments, :budget, :cost_type, :cost_type_id
 
   def costs
     self.budget || self.calculated_costs

app/models/variable_cost_object.rb

@@ -119,7 +119,9 @@ class VariableCostObject < CostObject
 
   def new_labor_budget_item_attributes=(labor_budget_item_attributes)
     labor_budget_item_attributes.each do |index, attributes|
-      labor_budget_items.build(attributes) if attributes[:hours].to_i > 0 && attributes[:user_id].to_i > 0
+      if attributes[:hours].to_i > 0 && attributes[:user_id].to_i > 0 && project.assignable_users.map(&:id).include?(attributes[:user_id].to_i)
+        labor_budget_items.build(attributes)
+      end
     end
   end
 
@@ -127,7 +129,7 @@ class VariableCostObject < CostObject
     labor_budget_items.reject(&:new_record?).each do |labor_budget_item|
       attributes = labor_budget_item_attributes[labor_budget_item.id.to_s]
       if User.current.allowed_to? :edit_cost_objects, labor_budget_item.cost_object.project
-        if attributes && attributes[:hours].to_i > 0 && attributes[:user_id].to_i > 0
+        if attributes && attributes[:hours].to_i > 0 && attributes[:user_id].to_i > 0 && project.assignable_users.map(&:id).include?(attributes[:user_id].to_i)
           attributes[:budget] = Rate.clean_currency(attributes[:budget])
           labor_budget_item.attributes = attributes
         else

lib/costs_groups_controller_patch.rb

@@ -19,7 +19,7 @@ module CostsGroupsControllerPatch
       # following three lines added/changed to original function
       membership_type = params[:membership_type] || "default"
       groups_users = users.each do |u|
-        @group.groups_users.create!(:user_id => u.id, :membership_type => membership_type)
+        @group.groups_users.create!(:user => u, :membership_type => membership_type)
       end
 
       respond_to do |format|