ldap.rb

require 'rubygems'
require 'net/ldap'

def get_ldap_response(ldap)
  msg = "Response Code: #{ ldap.get_operation_result.code }, Message: #{ ldap.get_operation_result.message }"

  raise msg unless ldap.get_operation_result.code == 0
end


ldap = Net::LDAP.new  :host => # your LDAP host name or IP goes here,
                      :port => # your LDAP host port goes here,
                      :encryption => :simple_tls,
                      :base => # the base of your AD tree goes here,
                      :auth => {
                        :method => :simple,
                        :username => # a user w/sufficient privileges to read from AD goes here,
                        :password => # the user's password goes here
                      }


search_param = # the AD account goes here
result_attrs = ["sAMAccountName", "displayName", "mail"] # Whatever you want to bring back in your result set goes here

# Build filter
search_filter = Net::LDAP::Filter.eq("sAMAccountName", search_param)

# Execute search
ldap.search(:filter => search_filter, :attributes => result_attrs) { |item| 
  puts "#{item.sAMAccountName.first}: #{item.displayName.first} (#{item.mail.first})" 
}

get_ldap_response(ldap)