ldap_auth.rb

require 'rubygems'
require 'net/ldap'
# sudo gem install ruby-net-ldap

HOSTNAME = "foo.local"
BASENAME = "dc=openrain,dc=com"
PORT = 389

puts "What's your username"
username = STDIN.readline.chomp
puts "What's your password"
password = STDIN.readline.chomp

ldap = Net::LDAP.new
ldap.host = HOSTNAME
ldap.port = PORT

me = "uid=#{username},cn=users,#{BASENAME}"
ldap.auth(me, password)
if ldap.bind
   filter = Net::LDAP::Filter.eq("uid", username) 
   attrs = ["uid", "givenName", "sn", "mail"]
   result = ldap.search(:base => BASENAME, :filter => filter, :attributes => attrs).first
   puts "Hello #{result.givenName} #{result.sn} (#{result.mail})"
else
   puts "Result: #{ldap.get_operation_result.code}"
   puts "Message: #{ldap.get_operation_result.message}"
end