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#!/usr/bin/ruby -Ku
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#--
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# CyborgHood, a distributed system management software.
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# Copyright (c) 2009 Marc Dequènes (Duck) <Duck@DuckCorp.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#++
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# http://www.ruby-doc.org/stdlib/libdoc/net/imap/rdoc/index.html
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Dir.chdir(File.dirname(File.expand_path(__FILE__)))
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$: << "./lib"
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#require 'socket'
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require 'tempfile'
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require 'shellwords'
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require 'cyborghood/imap'
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require 'cyborghood/mail'
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require 'cyborghood/objects'
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require 'cyborghood/services/dns'
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require 'fileutils'
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#Socket.gethostname
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module CyborgHood
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class CommandParser
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def self.run(order)
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result_list = []
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order.commands.each do |cmdstr|
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logger.info "Executing command: #{cmdstr}"
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begin
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result = execute_cmd(order.user, cmdstr, order.refs)
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if result.nil?
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result = OpenStruct.new
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result.cmd = cmdstr
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result.ok = false
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result.message = "Command not recognized."
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result.refs = nil
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end
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rescue CyberError => e
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result = OpenStruct.new
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result.cmd = cmdstr
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result.ok = false
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result.message = e.message.capitalize + "."
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result.refs = nil
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rescue
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logger.warn "Command crashed: " + $!
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result = OpenStruct.new
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result.cmd = cmdstr
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result.ok = false
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result.message = "Internal error. Administrator is warned."
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result.refs = nil
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end
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tag = result.ok ? "SUCCESS" :"FAILURE"
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logger.debug "Command result: [#{tag}] #{result.message}"
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result_list << result
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end
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result_list
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end
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private
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def self.execute_cmd(user, cmdstr, refs)
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cmdline = Shellwords.shellwords(cmdstr)
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subsys = cmdline.shift
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result = OpenStruct.new
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result.cmd = cmdstr
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result.ok = false
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ok = true
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case subsys.upcase
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when "DNS"
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return if cmdline.empty?
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case cmdline.shift.upcase
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when "INFO"
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return unless cmdline.empty?
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list = CyborgHood::DnsDomain.find_by_manager(user)
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txt_list = list.collect{|z| z.cn }.sort.join(", ")
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result.ok = true
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result.message = "You are manager of the following zones: #{txt_list}."
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when "GET"
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return if cmdline.empty?
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case cmdline.shift.upcase
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when "ZONE"
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return if cmdline.empty?
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zone = cmdline.shift.downcase
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dom = CyborgHood::DnsDomain.new(zone)
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unless dom.hosted?
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result.message = "This zone is not hosted here."
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return result
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end
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unless dom.managed_by? user
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result.message = "You are not allowed to manage this zone."
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return result
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end
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srv_dns = CyborgHood::Services::DNS.new(zone)
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result.ok = true
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result.message = "Requested zone content attached."
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zone_ref = {:content => srv_dns.read_zone, :filename => "dnszone_#{zone}.txt"}.to_ostruct
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result.refs = [zone_ref]
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end
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when "SET"
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return if cmdline.empty?
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case cmdline.shift.upcase
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when "ZONE"
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return if cmdline.empty?
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zone = cmdline.shift.downcase
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dom = CyborgHood::DnsDomain.new(zone)
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unless dom.hosted?
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result.message = "This zone is not hosted here."
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return result
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end
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unless dom.managed_by? user
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result.message = "You are not allowed to manage this zone."
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return result
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end
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srv_dns = CyborgHood::Services::DNS.new(zone)
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return if cmdline.empty?
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content_ref = cmdline.shift.downcase
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return unless content_ref =~ /^@(\d+)$/
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part_ref = $1.to_i
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unless (1..refs.size).include? part_ref
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result.message = "Attachment number not found."
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return result
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end
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part = refs[part_ref]
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unless part.content_type == "text/plain"
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result.message = "Attachment has wrong content-type."
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return result
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end
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f = Tempfile.new(zone)
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f.write(part.body)
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f.close
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logger.debug "Created temporary zone file '#{f.path}'"
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srv_dns = CyborgHood::Services::DNS.new(zone)
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current_serial = srv_dns.serial
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logger.debug "Current serial: #{current_serial}"
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dns_result = srv_dns.check_zone_file(f.path)
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unless dns_result.ok
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result.message = "Invalid zone data."
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f.close!
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return result
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end
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logger.debug "New serial: #{dns_result.serial}"
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# allow new serial or missing serial (to allow creating a new zone or replacing a broken zone)
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unless current_serial.nil? or dns_result.serial > current_serial
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result.message = "Zone serial is not superior to current serial."
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f.close!
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return result
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end
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begin
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srv_dns.write_zone_from_file(f.path)
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logger.debug "zone changed"
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if srv_dns.reload_zone
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logger.debug "zone reloaded"
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result.ok = true
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result.message = "Zone updated."
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else
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logger.warn "zone reload failed, replacing old content"
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srv_dns.replace_zone_with_backup
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result.message = "Internal error. Administrator is warned."
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end
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rescue
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logger.warn "Writing zone file failed"
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raise
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ensure
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f.close!
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end
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end
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end
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end
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if result.message.nil?
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# here fall lost souls
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nil
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else
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result
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end
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end
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end
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# not yet ready to be a real Cyborg
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class Postman #< Cyborg
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def initialize
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# load config
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Config.load(self.human_name.downcase)
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@config = Config.instance
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ldap_config = @config.ldap
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ldap_config.logger = logger
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ActiveLdap::Base.establish_connection(ldap_config.marshal_dump)
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# setup logs
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unless @config.log.nil?
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logger.output_level(@config.log.console_level) unless @config.log.console_level.nil?
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logger.log_to_file(@config.log.file) unless @config.log.file.nil?
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end
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@current_thread = Thread.current
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@stop_asap = false
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@waiting = false
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logger.info "Bot '#{self.human_name}' loaded"
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end
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def run
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imap = IMAP.new(@config.imap)
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until @stop_asap
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t = Time.now.to_i
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logger.debug "Starting mail check"
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check_mails(imap)
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logger.debug "Mail check finished"
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t2 = Time.now.to_i
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sleep_time = @config.imap.min_check_interval - (t2 - t)
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if sleep_time > 0
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logger.debug "Having a break before new check..."
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@waiting = true
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begin
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sleep(sleep_time)
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rescue
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end
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@waiting = false
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end
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end
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logger.info "Bot was asked to stop..." if @stop_asap
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logger.info "Bot terminating"
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end
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def check_mails(imap)
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imap.check_mail do |msg|
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if @stop_asap
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logger.info "Bot was asked to stop..."
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break
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end
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mail = Mail.new(msg.content)
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logger.info "Received mail with ID '#{mail.message_id}': #{mail.from_addrs} -> #{mail.to_addrs} (#{mail.subject})"
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# ignore mails not signed or encrypted
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unless mail.is_pgp_signed? or mail.is_pgp_encrypted?
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logger.info "Mail not signed/encrypted or not RFC3156 compliant, ignoring..."
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msg.delete
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next
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end
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logger.debug "RFC3156 content detected"
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begin
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order = mail.parse
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rescue CyberError => e
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case e.severity
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when :dangerous
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logger.fatal " (#{e.message})"
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exit 2
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when :unrecoverable
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logger.error "Internal processing error, skipping mail (#{e.message})"
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next
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when :ignorable
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end
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end
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if order.nil?
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logger.info "Mail is invalid, ignoring..."
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msg.delete
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next
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elsif not order.ok
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logger.info "Sending reply for rejected message (#{order.msg})"
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mail_reply = mail.create_reply
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mail_reply.set_content_type("text", "plain", {'charset' => "utf-8"})
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mail_reply.set_disposition("inline")
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mail_reply.quoted_printable_body = "A message (ID: #{mail.message_id}) apparently from you was rejected for the following reason:\n #{order.msg}"
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mail_reply.sign
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mail_reply.crypt(order.user.keyFingerPrint) unless order.user.nil?
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mail_reply.deliver
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msg.delete
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next
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end
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logger.debug "Message accepted, processing orders..."
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result_list = CommandParser.run(order)
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# create transcript
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logger.debug "Preparing reply"
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reply_txt = "Hello #{order.user.cn},\n\nFollows the transcript of your commands:\n"
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reply_attachments = []
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result_list.each do |result|
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reply_txt << "> #{result.cmd}\n"
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reply_txt << "#{result.message}\n"
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reply_attachments += result.refs unless result.refs.nil?
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end
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# create mail
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logger.debug "Preparing mail"
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mail_reply = mail.create_reply
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if reply_attachments.empty?
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transcript_part = mail_reply
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else
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mail_reply.set_content_type("multipart", "mixed", {'boundary' => TMail.new_boundary})
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parts = []
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p = CyborgHood::Mail.new
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transcript_part = p
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mail_reply.parts << p
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reply_attachments.each do |attachment|
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p = CyborgHood::Mail.new
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p.set_content_type("text", "plain", {'charset' => "utf-8"})
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p.set_disposition("attachment", {'filename' => attachment.filename})
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p.quoted_printable_body = attachment.content
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mail_reply.parts << p
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end
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end
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# insert transcript
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transcript_part.set_content_type("text", "plain", {'charset' => 'utf-8', 'format' => 'flowed'})
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transcript_part.set_disposition("inline")
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transcript_part.quoted_printable_body = reply_txt
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# send reply
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logger.debug "Sending mail"
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mail_reply.sign_and_crypt(order.user.keyFingerPrint)
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mail_reply.deliver
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logger.info "Message processed completely, deleting"
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msg.delete
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end
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end
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def ask_to_stop
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@stop_asap = true
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Thread.critical = true
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@current_thread.raise if @waiting
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Thread.critical = false
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end
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end
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end
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bot = CyborgHood::Postman.new
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trap('INT') do
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bot.ask_to_stop
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end
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trap('TERM') do
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bot.ask_to_stop
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end
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bot.run
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