class Rack::Protection::CookieTossing

session_key
The name of the session cookie (default: ‘rack.session’)
Options:
session cookie. This does not protect against a cookie overflow attack.
Does not accept HTTP requests if the HTTP_COOKIE header contains more than one
More infos
github.com/blog/1466-yummy-cookies-across-domains<br>Supported browsers
all
Prevented attack

Cookie Tossing
#

def accepts?(env) 

def accepts?(env)
  cookie_header = env['HTTP_COOKIE']
  cookies = Rack::Utils.parse_query(cookie_header, ';,') { |s| s }
  cookies.each do |k, v|
    if (k == session_key && Array(v).size > 1) ||
       (k != session_key && Rack::Utils.unescape(k) == session_key)
      bad_cookies << k
    end
  end
  bad_cookies.empty?
end

def bad_cookies 

def bad_cookies
  @bad_cookies ||= []
end

def call(env) 

def call(env)
  status, headers, body = super
  response = Rack::Response.new(body, status, headers)
  request = Rack::Request.new(env)
  remove_bad_cookies(request, response)
  response.finish
end

def cookie_paths(path) 

def cookie_paths(path)
  path = '/' if path.to_s.empty?
  paths = []
  Pathname.new(path).descend { |p| paths << p.to_s }
  paths
end

def empty_cookie(host, path) 

def empty_cookie(host, path)
  { value: '', domain: host, path: path, expires: Time.at(0) }
end

def redirect(env) 

def redirect(env)
  request = Request.new(env)
  warn env, "attack prevented by #{self.class}"
  [302, { 'Content-Type' => 'text/html', 'Location' => request.path }, []]
end

def remove_bad_cookies(request, response) 

def remove_bad_cookies(request, response)
  return if bad_cookies.empty?
  paths = cookie_paths(request.path)
  bad_cookies.each do |name|
    paths.each { |path| response.set_cookie name, empty_cookie(request.host, path) }
  end
end

def session_key 

def session_key
  @session_key ||= options[:session_key]
end