Nmap hostmap-bfk NSE Script


This page contains detailed information about how to use the hostmap-bfk NSE script. For list of all NSE scripts, visit the Nmap NSE Library.

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Overview
Error Messages

Script Overview

Script source code: https://github.com/nmap/nmap/tree/master/scripts/hostmap-bfk.nse
Script categories: external, discovery
Target service / protocol: -
Target network port(s): -
List of CVEs: -

Script Description

The hostmap-bfk.nse script discovers hostnames that resolve to the target's IP address by querying the online database at http://www.bfk.de/bfk_dnslogger.html.

The script is in the "external" category because it sends target IPs to a third party in order to query their database.

This script was formerly (until April 2012) known as hostmap.nse.

Hostmap-bfk NSE Script Arguments

This is a full list of arguments supported by the hostmap-bfk.nse script:

hostmap-bfk.prefix

If set, saves the output for each host in a file called "<prefix><target>". The file contains one entry per line.

newtargets

If set, add the new hostnames to the scanning queue. This the names presumably resolve to the same IP address as the original target, this is only useful for services such as HTTP that can change their behavior based on hostname.

smbdomain

The domain to log in with. If you aren't in a domain environment, then anything will (should?) be accepted by the server.

smbhash

A password hash to use when logging in. This is given as a single hex string (32 characters) or a pair of hex strings (both 32 characters, optionally separated by a single character). These hashes are the LanMan or NTLM hash of the user's password, and are stored on disk or in memory. They can be retrieved from memory using the fgdump or pwdump tools.

smbnoguest

Use to disable usage of the 'guest' account.

smbpassword

The password to connect with. Be cautious with this, since some servers will lock accounts if the incorrect password is given. Although it's rare that the Administrator account can be locked out, in the off chance that it can, you could get yourself in trouble. To use a blank password, leave this parameter off altogether.

smbtype

The type of SMB authentication to use. These are the possible options:

  • v1: Sends LMv1 and NTLMv1.
  • LMv1: Sends LMv1 only.
  • NTLMv1: Sends NTLMv1 only (default).
  • v2: Sends LMv2 and NTLMv2.
  • LMv2: Sends LMv2 only.
  • NTLMv2: Doesn't exist; the protocol doesn't support NTLMv2 alone. The default, NTLMv1, is a pretty decent compromise between security and compatibility. If you are paranoid, you might want to use v2 or lmv2 for this. (Actually, if you're paranoid, you should be avoiding this protocol altogether!). If you're using an extremely old system, you might need to set this to v1 or lm, which are less secure but more compatible. For information, see smbauth.lua.

smbusername

The SMB username to log in with. The forms "DOMAIN\username" and "username@DOMAIN" are not understood. To set a domain, use the smbdomain argument.

slaxml.debug

Debug level at which default callbacks will print detailed parsing info. Default: 3

http.host

The value to use in the Host header of all requests unless otherwise set. By default, the Host header uses the output of stdnse.get_hostname().

http.max-body-size

Limit the received body to specific number of bytes. An oversized body results in an error unless script argument http.truncated-ok or request option truncated_ok is set to true. The default is 2097152 (2MB). Use value -1 to disable the limit altogether. This argument can be overridden case-by-case with request option max_body_size.

http.max-cache-size

The maximum memory size (in bytes) of the cache.

http.max-pipeline

If set, it represents the number of outstanding HTTP requests that should be sent together in a single burst. Defaults to http.pipeline (if set), or to what function get_pipeline_limit returns.

http.pipeline

If set, it represents the number of HTTP requests that'll be sent on one connection. This can be set low to make debugging easier, or it can be set high to test how a server reacts (its chosen max is ignored).

http.truncated-ok

Do not treat oversized body as error. (Use response object flag truncated to check if the returned body has been truncated.) This argument can be overridden case-by-case with request option truncated_ok.

http.useragent

The value of the User-Agent header field sent with requests. By default it is "Mozilla/5.0 (compatible; Nmap Scripting Engine; https://nmap.org/book/nse.html)". A value of the empty string disables sending the User-Agent header field.

max-newtargets

Sets the number of the maximum allowed new targets. If set to 0 or less then there is no limit. The default value is 0.

- - -
To use these script arguments, add them to the Nmap command line using the --script-args arg1=value,[arg2=value,..] syntax. For example:

nmap --script=hostmap-bfk --script-args hostmap-bfk.prefix=value,newtargets=value <target>

Hostmap-bfk NSE Script Example Usage

Here's an example of how to use the hostmap-bfk.nse script:

nmap --script hostmap-bfk --script-args hostmap-bfk.prefix=hostmap- <targets>

Hostmap-bfk NSE Script Example Output

Here's a sample output from the hostmap-bfk.nse script:

Host script results:
| hostmap-bfk:
|   hosts:
|     insecure.org
|     173.255.243.189
|     images.insecure.org
|     www.insecure.org
|     nmap.org
|     189.243.255.173.in-addr.arpa
|     mail.nmap.org
|     svn.nmap.org
|     www.nmap.org
|     sectools.org
|     seclists.org
|_    li253-189.members.linode.com

Hostmap-bfk NSE Script Example XML Output

Here's a sample XML output from the hostmap-bfk.nse script produced by providing the -oX <file> Nmap option:

 <table key="hosts">
  <elem>insecure.org</elem>
  <elem>173.255.243.189</elem>
  <elem>images.insecure.org</elem>
  <elem>www.insecure.org</elem>
  <elem>nmap.org</elem>
  <elem>189.243.255.173.in-addr.arpa</elem>
  <elem>mail.nmap.org</elem>
  <elem>svn.nmap.org</elem>
  <elem>www.nmap.org</elem>
  <elem>sectools.org</elem>
  <elem>seclists.org</elem>
  <elem>li253-189.members.linode.com</elem>
 </table>

Author

  • Ange Gutek

References

See Also

Related NSE scripts to the hostmap-bfk.nse script:

Visit Nmap NSE Library for more scripts.

The hostmap-bfk.nse script may fail with the following error messages. Check for the possible causes by using the code snippets highlighted below found in the script source code. This can often times help in identifying the root cause of the problem.

Error: could not GET http://%s%s

Here is a relevant code snippet related to the "Error: could not GET http://%s%s" error message:

79:	  local query = "/bfk_dnslogger.html?query=" .. host.ip
80:	  local response
81:	  local output_tab = stdnse.output_table()
82:	  response = http.get(HOSTMAP_SERVER, 80, query, {any_af=true})
83:	  if not response.status then
84:	    stdnse.debug1("Error: could not GET http://%s%s", HOSTMAP_SERVER, query)
85:	    return nil
86:	  end
87:	  local hostnames = {}
88:	  local hosts_log = {}
89:	  for entry in string.gmatch(response.body, "#result" rel="nofollow">(.-)</a></tt>") do

Error: found no hostnames but not the marker for "no hostnames found" (pattern error?)

Here is a relevant code snippet related to the "Error: found no hostnames but not the marker for "no hostnames found" (pattern error?)" error message:

96:	    end
97:	  end
98:	
99:	  if #hosts_log == 0 then
100:	    if not string.find(response.body, "<p>The server returned no hits.</p>") then
101:	      stdnse.debug1("Error: found no hostnames but not the marker for "no hostnames found" (pattern error?)")
102:	    end
103:	    return nil
104:	  end
105:	  output_tab.hosts = hosts_log
106:	  local hostnames_str = table.concat(hostnames, "\n")

Error saving to %s: %sn

Here is a relevant code snippet related to the "Error saving to %s: %sn" error message:

110:	    local filename = filename_prefix .. stringaux.filename_escape(host.targetname or host.ip)
111:	    local status, err = write_file(filename, hostnames_str .. "\n")
112:	    if status then
113:	      output_tab.filename = filename
114:	    else
115:	      stdnse.debug1("Error saving to %s: %s\n", filename, err)
116:	    end
117:	  end
118:	
119:	  return output_tab
120:	end

Version

This page has been created based on Nmap version 7.92.

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