Class for 'CookieSHA1' type authentication. Implements the AUTH DBUS_COOKIE_SHA1 mechanism.
the autenticate method (called in stage one of authentification)
# File lib/dbus/auth.rb, line 48 def authenticate require 'etc' #number of retries we have for auth @retries = 1 return "#{hex_encode(Etc.getlogin)}" #server expects it to be binary end
handles the interesting crypto stuff, check the rbus-project for more info: rbus.rubyforge.org/
# File lib/dbus/auth.rb, line 61 def data(hexdata) require 'digest/sha1' data = hex_decode(hexdata) # name of cookie file, id of cookie in file, servers random challenge context, id, s_challenge = data.split(' ') # Random client challenge c_challenge = Array.new(s_challenge.bytesize/2).map{|obj|obj=rand(255).to_s}.join # Search cookie file for id path = File.join(ENV['HOME'], '.dbus-keyrings', context) puts "DEBUG: path: #{path.inspect}" if $debug File.foreach(path) do |line| if line.index(id) == 0 # Right line of file, read cookie cookie = line.split(' ')[2].chomp puts "DEBUG: cookie: #{cookie.inspect}" if $debug # Concatenate and encrypt to_encrypt = [s_challenge, c_challenge, cookie].join(':') sha = Digest::SHA1.hexdigest(to_encrypt) #the almighty tcp server wants everything hex encoded hex_response = hex_encode("#{c_challenge} #{sha}") # Return response response = [:AuthOk, hex_response] return response end end #a little rescue magic unless @retries <= 0 puts "ERROR: Could not auth, will now exit." puts "ERROR: Unable to locate cookie, retry in 1 second." @retries -= 1 sleep 1 data(hexdata) end end
decode hex to plain
# File lib/dbus/auth.rb, line 103 def hex_decode(encoded) encoded.scan(/[[:xdigit:]]{2}/).map{|h|h.hex.chr}.join end
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