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55a68712 Marc Dequenes
#!/usr/bin/ruby -Ku

# http://www.ruby-doc.org/stdlib/libdoc/net/imap/rdoc/index.html
# http://tmail.rubyforge.org/reference/index.html
# http://tools.ietf.org/html/rfc3156

$: << "./lib"

$KCODE = 'UTF8'
require 'jcode'
require 'log4r'
require 'net/imap'
require 'tmail'
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require 'tmail_extra'
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#require 'socket'
#require 'fileutils'
#require 'tempfile'
require 'gpgme'
require 'active_ldap'
require 'shellwords'
require 'cyborghood/base'

logger = Log4r::Logger.new('test')
logger.outputters = Log4r::StderrOutputter.new('')
logger.level = Log4r::WARN
#logger.level = Log4r::DEBUG

class Person < ActiveLdap::Base
ldap_mapping :dn_attribute => 'uid', :prefix => '', :classes => ['person', 'extInetOrgPerson']
end

class DnsDomain < ActiveLdap::Base
ldap_mapping :dn_attribute => 'cn', :prefix => '', :classes => ['genericDomain']

def managers
list = self.manager
return [] if list.nil?
return list.collect{|dn| dn.to_s } if list.is_a? Array
return [list.to_s]
end
end

ldap_config = {
:host => 'localhost',
:port => 389,
:base => 'dc=milkypond,dc=org',
:bind_dn => 'cn=srv-auth,dc=milkypond,dc=org',
:password => 'teckLetsoaj5',
:logger => logger,
:allow_anonymous => false,
:try_sasl => false,
#:method => :tls,
:scope => :sub
}

ActiveLdap::Base.establish_connection(ldap_config)

#Socket.gethostname

#
# TODO:
# - should be able to handle encrypted messages for user to send sensitive data (postman would need a GPG key too)
#

class CommandParser
def self.run(user, txt)
txt.each_line do |line|
line.chomp!
sline = line.strip
# skip empty lines and comments
next if sline == "" or sline[0, 1] == "#"
# stop processing when detecting message signature
break if line == "-- "

logger.info "### Executing command: #{sline}"
execute_cmd(user, sline)
end
end

private

def self.execute_cmd(user, cmdstr)
cmdline = Shellwords.shellwords(cmdstr)
subsys = cmdline.shift

ok = true
case subsys.upcase
when "DNS"
case cmdline.shift.upcase
when "INFO"
if cmdline.empty?
list = DnsDomain.find(:all, :attribute => 'manager', :value => user.dn)
logger.info "### User is manager of the following zones: " + list.collect{|z| z.cn }.join(", ")
else
ok = false
end
when "GET"
case cmdline.shift.upcase
when "ZONE"
zone = cmdline.shift.downcase
if zone =~ /^[a-z0-9.-]+\.[a-z]{2,4}$/
logger.info "### User requesting zone content for '#{zone}'"
begin
domain = DnsDomain.find(zone)
if domain.managers.include? user.dn
logger.info "### User is manager of the zone"
else
logger.info "### User is not allowed to manage the zone"
end
rescue
logger.info "### Zone not managed"
end
else
logger.info "### Invalid zone name specified (#{zone})"
end
else
ok = false
end
when "SET"
else
ok = false
end
else
ok = false
end

if not ok
logger.info "### Command not recognized: #{cmdstr}"
end
end
end

module CyborgHood
# not yet ready to be a real Cyborg
class Postman #< Cyborg
def initialize
# load config
Config.load(self.human_name.downcase)
@config = Config.instance

# setup logs
unless @config.log.nil?
logger.output_level(@config.log.console_level) unless @config.log.console_level.nil?
logger.log_to_file(@config.log.file) unless @config.log.file.nil?
end

logger.info "Bot '#{self.human_name}' loaded"
end

def run
# using SSL because TLS does not work in the NET::IMAP library
#imap = Net::IMAP.new('imap.duckcorp.org', 993, true, "/etc/ssl/certs/duckcorp.crt", true)
imap = Net::IMAP.new('localhost')
logger.debug "Connected to IMAP server"
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logger.debug "IMAP Capabilities: " + imap.capability.join(", ")
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imap.authenticate('LOGIN', @config.imap.login, @config.imap.passwd)
logger.debug "Logged into IMAP account"
#p imap.getquotaroot("INBOX")
imap.select('INBOX')
imap.search(["ALL"], "UTF-8").each do |message_id|
msg = imap.fetch(message_id, "RFC822")[0].attr["RFC822"]
# unquote headers and transform into TMail object
mail = TMail::Mail.parse(TMail::Unquoter.unquote_and_convert_to(msg, "UTF-8"))

logger.set_prefix()
logger.debug "######################################"
logger.set_prefix("[#{mail.message_id}] ")
logger.info "#{mail.from_addrs} -> #{mail.to_addrs}: #{mail.subject}"
# ignore mails not signed
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unless mail.is_pgp_signed?
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logger.info "Mail not signed or not RFC3156 compliant"
next
end

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decoded_content = mail.pgp_signed_part().body
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logger.debug "Proper signed content detected"
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sig_check = mail.verify_pgp_signature()
if sig_check.status == 0
logger.info "Mail content was properly signed by key #{sig_check.fingerprint}"
list = Person.find(:all, :attribute => 'keyFingerPrint', :value => sig_check.fingerprint)
case list.size
when 0
logger.info "Mail is from an unknow person"
when 1
user = list.first
logger.info "Mail is from user #{user.uid} (#{user.cn})"
CommandParser.run(user, decoded_content)
else
logger.warn "Multiple users match in database, so i guess there is a mistake. It is safer to skip..."
end
else
logger.info "Mail content tampered or badly signed: " + sig_check.to_s
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end
end
imap.logout
end

def ask_to_stop
end
end
end

bot = CyborgHood::Postman.new

trap('INT') do
bot.ask_to_stop
end
trap('TERM') do
bot.ask_to_stop
end

bot.run