Class: LintFu::Plugins::Rails::UnsafeFind

Inherits:
Issue
  • Object
show all
Defined in:
lib/lint_fu/plugins/rails/unsafe_find_checker.rb

Instance Attribute Summary

Attributes inherited from Issue

#confidence, #file, #sexp

Instance Method Summary collapse

Methods inherited from Issue

#brief, #file_basename, #issue_hash, #line, #relative_file

Constructor Details

#initialize(scan, file, sexp, subject) ⇒ UnsafeFind

Returns a new instance of UnsafeFind.



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# File 'lib/lint_fu/plugins/rails/unsafe_find_checker.rb', line 4

def initialize(scan, file, sexp, subject)
  super(scan, file, sexp)
  @subject = subject
end

Instance Method Details

#detail ⇒ Object 



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# File 'lib/lint_fu/plugins/rails/unsafe_find_checker.rb', line 10

def detail
  return "Could a bad guy manipulate <code>#{@subject}</code> and get/change stuff he shouldn't?"
end

#reference_info ⇒ Object 



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# File 'lib/lint_fu/plugins/rails/unsafe_find_checker.rb', line 14

def reference_info
  return "h4. What is it?\n\nAn unsafe find is an ActiveRecord query that is performed without checking whether the logged-in user is authorized to view or manipulate the resulting models.\n\nh4. When does it happen?\n\nSome trivial examples:\n\nbc. BankAccount.first(params[:id]).destroy\nAccount.all(:conditions=>{:nickname=>params[:nickname]})\n\nIn reality, it is often hard to determine whether a find is safe. Authorization can happen in many ways and the \"right\" way to do it depends on the application requirements.\n\nHere are some things to consider when evaluating whether a find is safe:\n\n* Is authorization checked beforehand or afterward, e.g. by checking ownership of the model?\n* Do the query's conditions scope it in some way to the current user or account?\n* How will the results be used? What information is displayed in the view?\n* Are the results scoped afterward, e.g. by calling @select@ on the result set?\n\nh4. How do I fix it?\n\nUse named scopes to scope your queries instead of calling the class-level finders:\n\nbc. current_user.bank_accounts.first(params[:id])\n\nIf a named scope is not convenient, include conditions that scope the query:\n\nbc. BankAccount.find(:conditions=>{:owner_id=>current_user})\n\nIf your authorization rules are so complex that neither of those approaches work, always make sure to perform authorization yourself:\n\nbc. #My bank allows customers to access ANY account on their birthday\n@bank_account = BankAccount.first(params[:id])\nraise ActiveRecord::RecordNotFound unless current_user.born_on = Date.today\n"
end