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# -*- coding: binary -*-
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require "rex/parser/nokogiri_doc_mixin"
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module Rex
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  module Parser
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    # If Nokogiri is available, define Template document class.
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    load_nokogiri && class MbsaDocument < Nokogiri::XML::SAX::Document
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    include NokogiriDocMixin
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    # Triggered every time a new element is encountered. We keep state
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    # ourselves with the @state variable, turning things on when we
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    # get here (and turning things off when we exit in end_element()).
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    def start_element(name=nil,attrs=[])
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      attrs = normalize_attrs(attrs)
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      block = @block
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      @state[:current_tag][name] = true
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      case name
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      when "SecScan"
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        record_host(attrs)
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      when "IP" # TODO: Check to see if IPList/IP is useful to import
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      when "Check" # A list of MBSA checks. They have an ID and a Name.
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        record_check(attrs)
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      when "Advice" # Check advice. Free form text about the check
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        @state[:has_text] = true
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      when "Detail" # Check/Detail is where missing fixes are.
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        record_detail(attrs)
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      when "UpdateData" # Info about installed/missing hotfixes
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        record_updatedata(attrs)
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      when "Title" # MSB Title
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        @state[:has_text] = true
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      when "InformationURL" # Only use this if we don't have a Bulletin ID
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        @state[:has_text] = true
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      end
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    end
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    # This breaks xml-encoded characters, so need to append
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    def characters(text)
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      return unless @state[:has_text]
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      @text ||= ""
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      @text << text
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    end
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    # When we exit a tag, this is triggered.
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    def end_element(name=nil)
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      block = @block
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      case name
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      when "SecScan" # Wrap it up
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        collect_host_data
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        host_object = report_host &block
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        if host_object
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          db.report_import_note(@args[:workspace],host_object)
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          report_fingerprint(host_object)
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          report_vulns(host_object,&block)
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        end
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        # Reset the state once we close a host
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        @state.delete_if {|k| k != :current_tag}
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      when "Check"
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        collect_check_data
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      when "Advice"
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        @state[:has_text] = false
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        collect_advice_data
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      when "Detail"
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        collect_detail_data
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      when "UpdateData"
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        collect_updatedata
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      when "Title"
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        @state[:has_text] = false
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        collect_title
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      when "InformationURL"
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        collect_url
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        @state[:has_text] = false
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      end
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      @state[:current_tag].delete name
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    end
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    def report_fingerprint(host_object)
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      return unless host_object.kind_of? ::Mdm::Host
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      return unless @report_data[:os_fingerprint]
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      fp_note = @report_data[:os_fingerprint].merge(
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        {
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          :workspace => host_object.workspace,
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          :host => host_object
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      })
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      db_report(:note, fp_note)
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    end
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    def collect_url
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      return unless in_tag("References")
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      return unless in_tag("UpdateData")
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      return unless in_tag("Detail")
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      return unless in_tag("Check")
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      @state[:update][:url] = @text.to_s.strip
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      @text = nil
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    end
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    def report_vulns(host_object, &block)
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      return unless host_object.kind_of? ::Mdm::Host
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      return unless @report_data[:vulns]
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      return if @report_data[:vulns].empty?
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      @report_data[:vulns].each do |vuln|
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        next unless vuln[:refs]
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        if vuln[:refs].empty?
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          next
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        end
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        if block
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          db.emit(:vuln, ["Missing #{vuln[:name]}",1], &block) if block
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        end
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        db_report(:vuln, vuln.merge(:host => host_object))
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      end
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    end
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    def collect_title
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      return unless in_tag("SecScan")
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      return unless in_tag("Check")
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      collect_bulletin_title
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      @text = nil
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    end
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    def collect_bulletin_title
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      return unless @state[:check_state]["ID"] == 500.to_s
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      return unless in_tag("UpdateData")
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      return unless @state[:update]
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      return if @text.to_s.strip.empty?
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      @state[:update]["Title"] = @text.to_s.strip
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    end
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    def collect_updatedata
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      return unless in_tag("SecScan")
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      return unless in_tag("Check")
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      return unless in_tag("Detail")
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      collect_missing_update
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      @state[:updates] = {}
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    end
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    def collect_missing_update
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      return unless @state[:check_state]["ID"] == 500.to_s
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      return if @state[:update]["IsInstalled"] == "true"
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      @report_data[:missing_updates] ||= []
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      this_update = {}
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      this_update[:name] = @state[:update]["Title"].to_s.strip
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      this_update[:refs] = []
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      if @state[:update]["BulletinID"].empty?
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        this_update[:refs] << "URL-#{@state[:update][:url]}"
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      else
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        this_update[:refs] << "MSB-#{@state[:update]["BulletinID"]}"
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      end
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      @report_data[:missing_updates] << this_update
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    end
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    # So far, just care about Host OS
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    # There is assuredly more interesting things going on in here.
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    def collect_advice_data
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      return unless in_tag("SecScan")
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      return unless in_tag("Check")
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      collect_os_name
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      @text = nil
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    end
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    def collect_os_name
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      return unless @state[:check_state]["ID"] == 10101.to_s
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      return unless @text
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      return if @text.strip.empty?
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      os_match = @text.match(/Computer is running (.*)/)
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      return unless os_match
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      os_info = os_match[1]
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      os_vendor = os_info[/Microsoft/]
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      os_family = os_info[/Windows/]
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      os_version = os_info[/(XP|2000 Advanced Server|2000|2003|2008|SBS|Vista|7 .* Edition|7)/]
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      if os_info
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        @report_data[:os_fingerprint] = {}
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        @report_data[:os_fingerprint][:type] = "host.os.mbsa_fingerprint"
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        @report_data[:os_fingerprint][:data] = {
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          :os_vendor => os_vendor,
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          :os_family => os_family,
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          :os_version => os_version,
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          :os_accuracy => 100,
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          :os_match => os_info.gsub(/\x2e$/n,"")
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        }
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      end
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    end
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    def collect_detail_data
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      return unless in_tag("SecScan")
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      return unless in_tag("Check")
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      if @report_data[:missing_updates]
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        @report_data[:vulns] = @report_data[:missing_updates]
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      end
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    end
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    def collect_check_data
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      return unless in_tag("SecScan")
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      @state[:check_state] = {}
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    end
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    def collect_host_data
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      return unless @state[:address]
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      return if @state[:address].strip.empty?
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      @report_data[:host] = @state[:address].strip
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      if @state[:hostname] && !@state[:hostname].empty?
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        @report_data[:name] = @state[:hostname]
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      end
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      @report_data[:state] = Msf::HostState::Alive
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    end
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    def report_host(&block)
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      if host_is_okay
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        db.emit(:address,@report_data[:host],&block) if block
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        host_info = @report_data.merge(:workspace => @args[:workspace])
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        db_report(:host, host_info)
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      end
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    end
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    def record_updatedata(attrs)
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      return unless in_tag("SecScan")
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      return unless in_tag("Check")
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      return unless in_tag("Detail")
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      update_attrs = attr_hash(attrs)
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      @state[:update] = attr_hash(attrs)
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    end
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    def record_host(attrs)
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      host_attrs = attr_hash(attrs)
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      @state[:address] = host_attrs["IP"]
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      @state[:hostname] = host_attrs["Machine"]
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    end
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    def record_check(attrs)
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      return unless in_tag("SecScan")
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      @state[:check_state] = attr_hash(attrs)
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    end
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    def record_detail(attrs)
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      return unless in_tag("SecScan")
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      return unless in_tag("Check")
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      @state[:detail_state] = attr_hash(attrs)
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    end
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    # We need to override the usual host_is_okay because MBSA apparently
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    # doesn't report on open ports at all.
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    def host_is_okay
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      return false unless @report_data[:host]
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      return false unless valid_ip(@report_data[:host])
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      return false unless @report_data[:state] == Msf::HostState::Alive
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      if @args[:blacklist]
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        return false if @args[:blacklist].include?(@report_data[:host])
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      end
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      return true
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    end
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  end
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end
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end
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