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require 'gssapi'
require 'base64'
require 'socket'
host = 'example.org'
service = 'host'
keytab = "#{ENV['HOME']}/.gssapi/krb5.keytab" # this is optional, but probably required if not running as root
tcpsrv = TCPServer.new(host, 8082)
loop do
Thread.start(tcpsrv.accept) do |s|
print(s, "Accepted Connection\n")
stok = s.gets.chomp
print(s, "Received string#{stok}\n")
srv = GSSAPI::Simple.new(host, service, keytab)
srv.acquire_credentials
otok = srv.accept_context(Base64.strict_decode64(stok.chomp))
s.write("#{Base64.strict_encode64(otok)}\n")
begin
emsg = s.gets.chomp
msg = srv.unwrap_message(Base64.strict_decode64(emsg.chomp))
puts "Received: #{msg}"
end while msg != 'exit'
print(s, "Closing Socket\n")
s.close
end
end
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