Set “secure” flag on session cookie in RoR even over HTTP

Question

In a Rails app, the session cookie can be easily set to include the secure cookie attribute, when sending over HTTPS to ensure that the cookie is not leaked over a

Answer 1

The same problem happened to me, and I solved it this way: In session_store.rb I configured:

MyApp::Application.config.session_store :cache_store, key: COOKIE_NAME, :expire_after => 1.days, :expires_in => 1.days, :domain => 'mydomain.com', same_site: :none

(note that I didn't put the , same_site: :none here, because it would kill the set cookie completely when serving HTTP)

And then I monkey patched the Rack->Utils->set_cookie_header, by placing this file in the initializers folder

require 'rack/utils'
module Rack
  module Utils
    def self.set_cookie_header!(header, key, value)
      case value
      when Hash
        domain  = "; domain="  + value[:domain] if value[:domain]
        path    = "; path="    + value[:path]   if value[:path]
        max_age = "; max-age=" + value[:max_age] if value[:max_age]
        expires = "; expires=" +
            rfc2822(value[:expires].clone.gmtime) if value[:expires]

        # Make secure always, even in HTTP
        # secure = "; secure"  if value[:secure]
        secure = "; secure"

        httponly = "; HttpOnly" if value[:httponly]
        same_site =
            case value[:same_site]
            when false, nil
              nil
            when :none, 'None', :None
              '; SameSite=None'
            when :lax, 'Lax', :Lax
              '; SameSite=Lax'
            when true, :strict, 'Strict', :Strict
              '; SameSite=Strict'
            else
              raise ArgumentError, "Invalid SameSite value: #{value[:same_site].inspect}"
            end
        value = value[:value]
      end
      value = [value] unless Array === value
      cookie = escape(key) + "=" +
          value.map { |v| escape v }.join("&") +
          "#{domain}#{path}#{max_age}#{expires}#{secure}#{httponly}#{same_site}"

      case header["Set-Cookie"]
      when nil, ''
        header["Set-Cookie"] = cookie
      when String
        header["Set-Cookie"] = [header["Set-Cookie"], cookie].join("\n")
      when Array
        header["Set-Cookie"] = (header["Set-Cookie"] + [cookie]).join("\n")
      end

      nil
    end
  end
end