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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::Auxiliary
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  include Msf::Exploit::Remote::SunRPC
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  include Msf::Auxiliary::Report
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  include Msf::Auxiliary::Scanner
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  include Msf::Auxiliary::Nfs
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  def initialize
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    super(
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      'Name' => 'NFS Mount Scanner',
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      'Description' => %q{
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        This module scans NFS mounts and their permissions.
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      },
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      'Author'	=> ['<tebo[at]attackresearch.com>'],
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      'References' => [
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        ['CVE', '1999-0170'],
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        ['CVE', '1999-0554'],
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        ['URL', 'https://www.ietf.org/rfc/rfc1094.txt']
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      ],
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      'License'	=> MSF_LICENSE
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    )
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    register_options([
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      OptEnum.new('PROTOCOL', [ true, 'The protocol to use', 'udp', ['udp', 'tcp']])
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    ])
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    register_advanced_options(
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      [
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        OptBool.new('Mountable', [false, 'Determine if an export is mountable', true]),
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      ]
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    )
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  end
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  def run_host(ip)
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    program	= 100005
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    progver	= 1
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    procedure	= 5
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    sunrpc_create(datastore['PROTOCOL'], program, progver)
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    sunrpc_authnull
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    resp = sunrpc_call(procedure, '')
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    # XXX: Assume that transport is udp and port is 2049
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    # Technically we are talking to mountd not nfsd
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    report_service(
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      host: ip,
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      proto: datastore['PROTOCOL'],
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      port: 2049,
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      name: 'nfsd',
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      info: "NFS Daemon #{program} v#{progver}"
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    )
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    exports = resp[3, 1].unpack('C')[0]
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    if (exports == 0x01)
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      shares = []
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      while Rex::Encoder::XDR.decode_int!(resp) == 1
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        dir = Rex::Encoder::XDR.decode_string!(resp)
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        grp = []
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        grp << Rex::Encoder::XDR.decode_string!(resp) while Rex::Encoder::XDR.decode_int!(resp) == 1
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        if can_mount?(grp, datastore['Mountable'], datastore['HOSTNAME'], datastore['LHOST'] || '')
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          print_good("#{ip} Mountable NFS Export: #{dir} [#{grp.join(', ')}]")
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        else
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          print_status("#{ip} NFS Export: #{dir} [#{grp.join(', ')}]")
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        end
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        shares << [dir, grp]
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      end
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      report_note(
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        host: ip,
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        proto: datastore['PROTOCOL'],
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        port: 2049,
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        type: 'nfs.exports',
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        data: { exports: shares },
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        update: :unique_data
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      )
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    elsif (exports == 0x00)
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      vprint_status("#{ip} - No exported directories")
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    end
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    sunrpc_destroy
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  rescue ::Rex::Proto::SunRPC::RPCTimeout, ::Rex::Proto::SunRPC::RPCError => e
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    vprint_error(e.to_s)
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  end
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end
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