From 0e684d82ea1ad0f5c85b8aa0147ffec39aac8ddd Mon Sep 17 00:00:00 2001 From: Peter Souter Date: Wed, 7 Dec 2016 19:25:03 +0000 Subject: (MODULES-4188) Add FQDN UUID generation function * Generates UUID based on a given FQDN string and the DNS namespace (6ba7b810-9dad-11d1-80b4-00c04fd430c8) --- lib/puppet/parser/functions/fqdn_uuid.rb | 92 ++++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 lib/puppet/parser/functions/fqdn_uuid.rb (limited to 'lib/puppet/parser/functions') diff --git a/lib/puppet/parser/functions/fqdn_uuid.rb b/lib/puppet/parser/functions/fqdn_uuid.rb new file mode 100644 index 0000000..30205d0 --- /dev/null +++ b/lib/puppet/parser/functions/fqdn_uuid.rb @@ -0,0 +1,92 @@ +require 'digest/sha1' + +module Puppet::Parser::Functions + newfunction(:fqdn_uuid, :type => :rvalue, :doc => <<-END) do |args| + + Creates a UUID based on a given string, assumed to be the FQDN + + For example, to generate a UUID based on the FQDN of a system: + + Usage: + + $uuid = fqdn_uuid($::fqdn) + + The generated UUID will be the same for the given hostname + + The resulting UUID is returned on the form: + + 1d839dea-5e10-5243-88eb-e66815bd7d5c + + (u.e. without any curly braces.) + + The generated UUID is a version 5 UUID with the V5 DNS namespace: + + 6ba7b810-9dad-11d1-80b4-00c04fd430c8 + + This only supports a the V5 SHA-1 hash, using the DNS namespace. + + Please consult http://www.ietf.org/rfc/rfc4122.txt for the details on + UUID generation and example implementation. + + No verification is present at the moment as whether the domain name given + is in fact a correct fully-qualified domain name. Therefore any arbitrary + string and/or alpha-numeric value can subside for a domain name. + EOS + + END + + if args.length == 0 + raise(ArgumentError, "fqdn_uuid: No arguments given") + elsif args.length == 1 + fqdn = args[0] + else + raise(ArgumentError, "fqdn_uuid: Too many arguments given (#{args.length})") + end + + # Code lovingly taken from + # https://github.com/puppetlabs/marionette-collective/blob/master/lib/mcollective/ssl.rb + + # This is the UUID version 5 type DNS name space which is as follows: + # + # 6ba7b810-9dad-11d1-80b4-00c04fd430c8 + # + uuid_name_space_dns = [0x6b, + 0xa7, + 0xb8, + 0x10, + 0x9d, + 0xad, + 0x11, + 0xd1, + 0x80, + 0xb4, + 0x00, + 0xc0, + 0x4f, + 0xd4, + 0x30, + 0xc8 + ].map {|b| b.chr}.join + + sha1 = Digest::SHA1.new + sha1.update(uuid_name_space_dns) + sha1.update(fqdn) + + # first 16 bytes.. + bytes = sha1.digest[0, 16].bytes.to_a + + # version 5 adjustments + bytes[6] &= 0x0f + bytes[6] |= 0x50 + + # variant is DCE 1.1 + bytes[8] &= 0x3f + bytes[8] |= 0x80 + + bytes = [4, 2, 2, 2, 6].collect do |i| + bytes.slice!(0, i).pack('C*').unpack('H*') + end + + bytes.join('-') + end +end -- cgit v1.2.3