gistfile1.rb

class ActiveDirectory 
  include EnvironmentConfigurable
  configure_with "config/active_directory.yml"

  def self.valid_credentials?(login, password)
    ldap = Net::LDAP.new(
      :host => config.host, # active_directory.atomicobject.com
      :port => config.port, # 389
      :base => config.base, # dc=atomicobject,dc=com
      :auth => {
        :method => :simple, 
        :username => config.server_username, # cn=server,dc=atomicobject,dc=com
        :password => config.server_password  # server password
      }
    )
    filter = Net::LDAP::Filter.eq('sAMAccountName', login)
    if ldap.bind_as(:filter => filter, :password => password)
      true
    else
      Rails.logger.error("Active Directory validation failed for '#{login}': #{ldap.get_operation_result.message}")
      false
    end
  end
end