local comm = require "comm" local os = require "os" local datetime = require "datetime" local bin = require "bin" local shortport = require "shortport" local sslcert = require "sslcert" local stdnse = require "stdnse" local base64 = require "base64" local smbauth = require "smbauth" local string = require "string" description = [[ This script enumerates information from remote IMAP services with NTLM authentication enabled. Sending an IMAP 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 143,993 --script imap-ntlm-info -- -- @output -- 143/tcp open imap -- | imap-ntlm-info: -- | Target_Name: ACTIVEIMAP -- | NetBIOS_Domain_Name: ACTIVEIMAP -- | NetBIOS_Computer_Name: IMAP-TEST2 -- | DNS_Domain_Name: somedomain.com -- | DNS_Computer_Name: imap-test2.somedomain.com -- | DNS_Tree_Name: somedomain.com -- |_ Product_Version: 6.1.7601 -- --@xmloutput -- ACTIVEIMAP -- ACTIVEIMAP -- IMAP-TEST2 -- somedomain.com -- imap-test2.somedomain.com -- somedomain.com -- 6.1.7601 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({ 143, 993 }, { "imap", "imaps" }) action = function(host, port) local output = stdnse.output_table() local starttls = sslcert.isPortSupported(port) local socket if starttls then local status status, socket = starttls(host, port) if not status then -- could be socket problems, but more likely STARTTLS not supported. stdnse.debug1("starttls error: %s", socket) socket = nil end end if not socket then local line, bopt, first_line socket, line, bopt, first_line = comm.tryssl(host, port, "" , {recv_before=true}) if not socket then stdnse.debug1("connection error: %s", line) return nil end end socket:send("000b AUTHENTICATE NTLM\r\n") local status, response = socket:receive() if not status then stdnse.debug1("Socket receive failed: %s", response) return nil end if not response then stdnse.debug1("No response to AUTHENTICATE NTLM") return nil end socket:send(ntlm_auth_blob .. "\r\n") status, response = socket:receive() if not status then stdnse.debug1("Socket receive failed: %s", response) return nil end if not response then stdnse.debug1("No response to NTLM challenge") return nil end local recvtime = os.time() socket:close() if string.match(response, "^A%d%d%d%d ") then stdnse.debug2("NTLM auth not supported.") return nil end -- Continue only if a + response is returned local response_decoded = string.match(response, "+ (.*)") if not response_decoded then stdnse.debug1("Unexpected response to NTLM challenge: %s", response) return nil end local response_decoded = base64.dec(response_decoded) -- Continue only if NTLMSSP response is returned if not string.match(response_decoded, "^NTLMSSP") then stdnse.debug1("Unexpected response to NTLM challenge: %s", response) 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