Simple TLS server with client renegotiation disabled

gistfile1.rb

require 'openssl'
require 'socket'

KEY = OpenSSL::PKey::RSA.new <<-_end_of_pem_
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
  _end_of_pem_

def issue_cert(dn, key, serial, not_before, not_after, extensions,
               issuer, issuer_key, digest)
  cert = OpenSSL::X509::Certificate.new
  issuer = cert unless issuer
  issuer_key = key unless issuer_key
  cert.version = 2
  cert.serial = serial
  cert.subject = dn
  cert.issuer = issuer.subject
  cert.public_key = key.public_key
  cert.not_before = not_before
  cert.not_after = not_after
  ef = OpenSSL::X509::ExtensionFactory.new
  ef.subject_certificate = cert
  ef.issuer_certificate = issuer
  extensions.each{|oid, value, critical|
    cert.add_extension(ef.create_extension(oid, value, critical))
  }
  cert.sign(issuer_key, digest)
  cert
end

def server_cert
  svr = OpenSSL::X509::Name.parse("/DC=org/DC=ruby-lang/CN=localhost")
  now = Time.at(Time.now.to_i)
  ee_exts = [
    ["keyUsage","keyEncipherment,digitalSignature",true],
  ]
  issue_cert(svr, KEY, 1, now, now+3600, ee_exts, nil, nil, OpenSSL::Digest::SHA1.new)
end

CERT = server_cert
HOST = '127.0.0.1'
PORT = 8443

def start_server
  ctx = OpenSSL::SSL::SSLContext.new
  ctx.cert = CERT
  ctx.key = KEY
  ctx.ssl_version = :SSLv23
  num_handshakes = 0
  ctx.renegotiation_cb = lambda do |ssl|
    puts "Negotiating..."
    num_handshakes += 1
    raise RuntimeError.new("No client renegotiation allowed") if num_handshakes > 1
  end 
  tcps = TCPServer.new(HOST, PORT)
  ssls = OpenSSL::SSL::SSLServer.new(tcps, ctx)
  ssls.start_immediately = true
  begin
    done = false
    loop do
      ssl = ssls.accept
      puts "Connected"
      begin
        while line = ssl.gets
          puts "Client says: #{line}"
          ssl.write(line)
        end
      ensure
        ssl.close
      end
    end
  ensure
    tcps.close if (tcps)
  end
end

start_server

got also a client to test this?