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local comm = require "comm"
local os = require "os"
local datetime = require "datetime"
local shortport = require "shortport"
local stdnse = require "stdnse"
local base64 = require "base64"
local smbauth = require "smbauth"
local string = require "string"
description = [[
This script enumerates information from remote POP3 services with NTLM
authentication enabled.
Sending a POP3 NTLM authentication request with null credentials will
cause the remote service to respond with a NTLMSSP message disclosing
information to include NetBIOS, DNS, and OS build version.
]]
---
-- @usage
-- nmap -p 110,995 --script pop3-ntlm-info <target>
--
-- @output
-- 110/tcp open pop3
-- | pop3-ntlm-info:
-- | Target_Name: ACTIVEPOP3
-- | NetBIOS_Domain_Name: ACTIVEPOP3
-- | NetBIOS_Computer_Name: POP3-TEST2
-- | DNS_Domain_Name: somedomain.com
-- | DNS_Computer_Name: pop3-test2.somedomain.com
-- | DNS_Tree_Name: somedomain.com
-- |_ Product_Version: 6.1.7601
--
--@xmloutput
-- <elem key="Target_Name">ACTIVEPOP3</elem>
-- <elem key="NetBIOS_Domain_Name">ACTIVEPOP3</elem>
-- <elem key="NetBIOS_Computer_Name">POP3-TEST2</elem>
-- <elem key="DNS_Domain_Name">somedomain.com</elem>
-- <elem key="DNS_Computer_Name">pop3-test2.somedomain.com</elem>
-- <elem key="DNS_Tree_Name">somedomain.com</elem>
-- <elem key="Product_Version">6.1.7601</elem>
author = "Justin Cacak"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"default", "discovery", "safe"}
local ntlm_auth_blob = base64.enc( select(2,
smbauth.get_security_blob(nil, nil, nil, nil, nil, nil, nil,
0x00000001 + -- Negotiate Unicode
0x00000002 + -- Negotiate OEM strings
0x00000004 + -- Request Target
0x00000200 + -- Negotiate NTLM
0x00008000 + -- Negotiate Always Sign
0x00080000 + -- Negotiate NTLM2 Key
0x20000000 + -- Negotiate 128
0x80000000 -- Negotiate 56
))
)
portrule = shortport.port_or_service({ 110, 995 }, { "pop3", "pop3s" })
action = function(host, port)
local output = stdnse.output_table()
-- Negotiate connection protocol
local socket, line, bopt, first_line = comm.tryssl(host, port, "" , {recv_before=true})
if not socket then
return
end
-- Do not attempt to upgrade to a TLS connection if already over TLS
if not shortport.ssl(host,port) then
-- Attempt to upgrade to a TLS connection if supported (may not be advertised)
-- Various implementations *require* this before accepting authentication requests
socket:send("STLS\r\n")
local status, response = socket:receive()
if not status then
return
end
-- Upgrade the connection if STARTTLS permitted, else continue without
if string.match(response, ".*OK.*") then
status, response = socket:reconnect_ssl()
if not status then
return
end
end
end
socket:send("AUTH NTLM\r\n")
local status, response = socket:receive()
if not response then
return
end
socket:send(ntlm_auth_blob .. "\r\n")
status, response = socket:receive()
if not response then
return
end
local recvtime = os.time()
socket:close()
-- Continue only if a + response is returned
if not string.match(response, "+ .*") then
return
end
local response_decoded = base64.dec(string.match(response, "+ (.*)"))
-- Continue only if NTLMSSP response is returned
if not string.match(response_decoded, "(NTLMSSP.*)") then
return nil
end
-- Leverage smbauth.get_host_info_from_security_blob() for decoding
local ntlm_decoded = smbauth.get_host_info_from_security_blob(response_decoded)
if ntlm_decoded.timestamp then
-- 64-bit number of 100ns clicks since 1/1/1601
local unixstamp = ntlm_decoded.timestamp // 10000000 - 11644473600
datetime.record_skew(host, unixstamp, recvtime)
end
-- Target Name will always be returned under any implementation
output.Target_Name = ntlm_decoded.target_realm
-- Display information returned & ignore responses with null values
if ntlm_decoded.netbios_domain_name and #ntlm_decoded.netbios_domain_name > 0 then
output.NetBIOS_Domain_Name = ntlm_decoded.netbios_domain_name
end
if ntlm_decoded.netbios_computer_name and #ntlm_decoded.netbios_computer_name > 0 then
output.NetBIOS_Computer_Name = ntlm_decoded.netbios_computer_name
end
if ntlm_decoded.dns_domain_name and #ntlm_decoded.dns_domain_name > 0 then
output.DNS_Domain_Name = ntlm_decoded.dns_domain_name
end
if ntlm_decoded.fqdn and #ntlm_decoded.fqdn > 0 then
output.DNS_Computer_Name = ntlm_decoded.fqdn
end
if ntlm_decoded.dns_forest_name and #ntlm_decoded.dns_forest_name > 0 then
output.DNS_Tree_Name = ntlm_decoded.dns_forest_name
end
if ntlm_decoded.os_major_version then
output.Product_Version = string.format("%d.%d.%d",
ntlm_decoded.os_major_version, ntlm_decoded.os_minor_version, ntlm_decoded.os_build)
end
return output
end
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