local smb = require "smb" local stdnse = require "stdnse" local string = require "string" local table = require "table" description = [[ Attempts to determine the operating system, computer name, domain, workgroup, and current time over the SMB protocol (ports 445 or 139). This is done by starting a session with the anonymous account (or with a proper user account, if one is given; it likely doesn't make a difference); in response to a session starting, the server will send back all this information. The following fields may be included in the output, depending on the circumstances (e.g. the workgroup name is mutually exclusive with domain and forest names) and the information available: * OS * Computer name * Domain name * Forest name * FQDN * NetBIOS computer name * NetBIOS domain name * Workgroup * System time Some systems, like Samba, will blank out their name (and only send their domain). Other systems (like embedded printers) will simply leave out the information. Other systems will blank out various pieces (some will send back 0 for the current time, for example). Retrieving the name and operating system of a server is a vital step in targeting an attack against it, and this script makes that retrieval easy. Additionally, if a penetration tester is choosing between multiple targets, the time can help identify servers that are being poorly maintained (for more information/random thoughts on using the time, see http://www.skullsecurity.org/blog/?p=76. Although the standard smb* script arguments can be used, they likely won't change the outcome in any meaningful way. However, smbnoguest will speed up the script on targets that do not allow guest access. ]] --- --@usage -- nmap --script smb-os-discovery.nse -p445 127.0.0.1 -- sudo nmap -sU -sS --script smb-os-discovery.nse -p U:137,T:139 127.0.0.1 -- --@output -- Host script results: -- | smb-os-discovery: -- | OS: Windows Server (R) 2008 Standard 6001 Service Pack 1 (Windows Server (R) 2008 Standard 6.0) -- | OS CPE: cpe:/o:microsoft:windows_2008::sp1 -- | Computer name: Sql2008 -- | NetBIOS computer name: SQL2008 -- | Domain name: lab.test.local -- | Forest name: test.local -- | FQDN: Sql2008.lab.test.local -- | NetBIOS domain name: LAB -- |_ System time: 2011-04-20T13:34:06-05:00 -- --@xmloutput -- Windows Server (R) 2008 Standard 6001 Service Pack 1 -- cpe:/o:microsoft:windows_2008::sp1 -- Windows Server (R) 2008 Standard 6.0 -- LAB -- SQL2008 -- 2011-04-20T13:34:06-05:00 -- Sql2008.lab.test.local -- lab.test.local -- test.local author = "Ron Bowes" license = "Same as Nmap--See https://nmap.org/book/man-legal.html" categories = {"default", "discovery", "safe"} dependencies = {"smb-brute"} --- Check whether or not this script should be run. hostrule = function(host) return smb.get_port(host) ~= nil end -- Some observed OS strings: -- "Windows 5.0" (is Windows 2000) -- "Windows 5.1" (is Windows XP) -- "Windows Server 2003 3790 Service Pack 2" -- "Windows Vista (TM) Ultimate 6000" -- "Windows Server (R) 2008 Standard 6001 Service Pack 1" -- "Windows 7 Professional 7601 Service Pack 1" -- http://msdn.microsoft.com/en-us/library/cc246806%28v=prot.20%29.aspx has a -- list of strings that don't quite match these. function make_cpe(result) local os = result.os local parts = {} if string.match(os, "^Windows 5%.0") then parts = {"o", "microsoft", "windows_2000"} elseif string.match(os, "^Windows 5%.1") then parts = {"o", "microsoft", "windows_xp"} elseif string.match(os, "^Windows Server.*2003") then parts = {"o", "microsoft", "windows_server_2003"} elseif string.match(os, "^Windows Vista") then parts = {"o", "microsoft", "windows_vista"} elseif string.match(os, "^Windows Server.*2008") then parts = {"o", "microsoft", "windows_server_2008"} elseif string.match(os, "^Windows 7") then parts = {"o", "microsoft", "windows_7"} elseif string.match(os, "^Windows 8%f[^%d.]") then parts = {"o", "microsoft", "windows_8"} elseif string.match(os, "^Windows 8.1") then parts = {"o", "microsoft", "windows_8.1"} elseif string.match(os, "^Windows 10%f[^%d.]") then parts = {"o", "microsoft", "windows_10"} elseif string.match(os, "^Windows Server.*2012") then parts = {"o", "microsoft", "windows_server_2012"} end if parts[1] == "o" and parts[2] == "microsoft" and string.match(parts[3], "^windows") then parts[4] = "" local sp = string.match(os, "Service Pack (%d+)") if sp then parts[5] = "sp" .. tostring(sp) else parts[5] = "-" end if string.match(os, "Professional") then parts[6] = "professional" end end if #parts > 0 then return "cpe:/" .. stdnse.strjoin(":", parts) end end function add_to_output(output_table, label, value) if value then table.insert(output_table, string.format("%s: %s", label, value)) end end action = function(host) local response = stdnse.output_table() local status, result = smb.get_os(host) if(status == false) then return stdnse.format_output(false, result) end -- Collect results. response.os = result.os response.lanmanager = result.lanmanager response.domain = result.domain response.server = result.server if result.time and result.timezone then response.date = stdnse.format_timestamp(result.time, result.timezone * 60 * 60) end response.fqdn = result.fqdn response.domain_dns = result.domain_dns response.forest_dns = result.forest_dns response.workgroup = result.workgroup response.cpe = make_cpe(result) -- Build normal output. local output_lines = {} if response.os and response.lanmanager then add_to_output(output_lines, "OS", string.format("%s (%s)", smb.get_windows_version(response.os), response.lanmanager)) else add_to_output(output_lines, "OS", "Unknown") end add_to_output(output_lines, "OS CPE", response.cpe) if response.fqdn then -- Pull the first part of the FQDN as the computer name. add_to_output(output_lines, "Computer name", string.match(response.fqdn, "^([^.]+)%.?")) end add_to_output(output_lines, "NetBIOS computer name", result.server) if response.fqdn and response.domain_dns and response.fqdn ~= response.domain_dns then -- If the FQDN doesn't match the domain name, the target is a domain member. add_to_output(output_lines, "Domain name", response.domain_dns) add_to_output(output_lines, "Forest name", response.forest_dns) add_to_output(output_lines, "FQDN", response.fqdn) add_to_output(output_lines, "NetBIOS domain name", response.domain) else add_to_output(output_lines, "Workgroup", response.workgroup or response.domain) end add_to_output(output_lines, "System time", response.date or "Unknown") return response, stdnse.format_output(true, output_lines) end