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metasploit-framework
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metasploit-framework/lib/rex/proto/ntlm/message.rb

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#
# An NTLM Authentication Library for Ruby
#
# This code is a derivative of "dbf2.rb" written by yrock
# and Minero Aoki. You can find original code here:
# http://jp.rubyist.net/magazine/?0013-CodeReview
# -------------------------------------------------------------
# Copyright (c) 2005,2006 yrock
#
# This program is free software.
# You can distribute/modify this program under the terms of the
# Ruby License.
#
# 2011-02-23 refactored by Alexandre Maloteaux for Metasploit Project
# -------------------------------------------------------------
#
# 2006-02-11 refactored by Minero Aoki
# -------------------------------------------------------------
#
# All protocol information used to write this code stems from
# "The NTLM Authentication Protocol" by Eric Glass. The author
# would thank to him for this tremendous work and making it
# available on the net.
# http://davenport.sourceforge.net/ntlm.html
# -------------------------------------------------------------
# Copyright (c) 2003 Eric Glass
#
# Permission to use, copy, modify, and distribute this document
# for any purpose and without any fee is hereby granted,
# provided that the above copyright notice and this list of
# conditions appear in all copies.
# -------------------------------------------------------------
#
# The author also looked Mozilla-Firefox-1.0.7 source code,
# namely, security/manager/ssl/src/nsNTLMAuthModule.cpp and
# Jonathan Bastien-Filiatrault's libntlm-ruby.
# "http://x2a.org/websvn/filedetails.php?
# repname=libntlm-ruby&path=%2Ftrunk%2Fntlm.rb&sc=1"
# The latter has a minor bug in its separate_keys function.
# The third key has to begin from the 14th character of the
# input string instead of 13th:)
#--
# $Id: ntlm.rb 11678 2011-01-30 19:26:35Z hdm $
#++
#this module defines the message class , useful for easily handling type 1/2/3 ntlm messages
require 'rex/proto/ntlm/base'
require 'rex/proto/ntlm/constants'
require 'rex/proto/ntlm/crypt'
module Rex
module Proto
module NTLM
class Message < Rex::Proto::NTLM::Base::FieldSet
BASE = Rex::Proto::NTLM::Base
CONST = Rex::Proto::NTLM::Constants
class << Message
def parse(str)
m = Type0.new
m.parse(str)
case m.type
when 1
t = Type1.parse(str)
when 2
t = Type2.parse(str)
when 3
t = Type3.parse(str)
else
raise ArgumentError, "unknown type: #{m.type}"
end
t
end
def decode64(str)
parse(Rex::Text::decode_base64(str))
end
end#self
def has_flag?(flag)
(self[:flag].value & CONST::FLAGS[flag]) == CONST::FLAGS[flag]
end
def set_flag(flag)
self[:flag].value |= CONST::FLAGS[flag]
end
def dump_flags
CONST::FLAG_KEYS.each{ |k| print(k, "=", flag?(k), "\n") }
end
def serialize
deflag
super + security_buffers.map{|n, f| f.value}.join
end
def encode64
Rex::Text::encode_base64(serialize)
end
def decode64(str)
parse(Rex::Text::decode_base64(str))
end
alias head_size size
def data_size
security_buffers.inject(0){|sum, a| sum += a[1].data_size}
end
def size
head_size + data_size
end
private
def security_buffers
@alist.find_all{|n, f| f.instance_of?(BASE::SecurityBuffer)}
end
def deflag
security_buffers.inject(head_size){|cur, a|
a[1].offset = cur
cur += a[1].data_size
}
end
def data_edge
security_buffers.map{ |n, f| f.active ? f.offset : size}.min
end
# sub class definitions
Type0 = Message.define {
string :sign, {:size => 8, :value => CONST::SSP_SIGN}
int32LE :type, {:value => 0}
}
Type1 = Message.define {
string :sign, {:size => 8, :value => CONST::SSP_SIGN}
int32LE :type, {:value => 1}
int32LE :flag, {:value => CONST::DEFAULT_FLAGS[:TYPE1] }
security_buffer :domain, {:value => "", :active => false}
security_buffer :workstation, {:value => "", :active => false}
string :padding, {:size => 0, :value => "", :active => false }
}
class Type1
class << Type1
def parse(str)
t = new
t.parse(str)
t
end
end
def parse(str)
super(str)
enable(:domain) if has_flag?(:DOMAIN_SUPPLIED)
enable(:workstation) if has_flag?(:WORKSTATION_SUPPLIED)
super(str)
if ( (len = data_edge - head_size) > 0)
self.padding = "\0" * len
super(str)
end
end
end
Type2 = Message.define{
string :sign, {:size => 8, :value => CONST::SSP_SIGN}
int32LE :type, {:value => 2}
security_buffer :target_name, {:size => 0, :value => ""}
int32LE :flag, {:value => CONST::DEFAULT_FLAGS[:TYPE2]}
int64LE :challenge, {:value => 0}
int64LE :context, {:value => 0, :active => false}
security_buffer :target_info, {:value => "", :active => false}
string :padding, {:size => 0, :value => "", :active => false }
}
class Type2
class << Type2
def parse(str)
t = new
t.parse(str)
t
end
end
def parse(str)
super(str)
if has_flag?(:TARGET_INFO)
enable(:context)
enable(:target_info)
super(str)
end
if ( (len = data_edge - head_size) > 0)
self.padding = "\0" * len
super(str)
end
end
def response(arg, opt = {})
usr = arg[:user]
pwd = arg[:password]
if usr.nil? or pwd.nil?
raise ArgumentError, "user and password have to be supplied"
end
if opt[:workstation]
ws = opt[:workstation]
else
ws = ""
end
if opt[:client_challenge]
cc = opt[:client_challenge]
else
cc = rand(CONST::MAX64)
end
cc = Rex::Text::pack_int64le(cc) if cc.is_a?(Integer)
opt[:client_challenge] = cc
if has_flag?(:OEM) and opt[:unicode]
usr = Rex::Text::to_ascii(usr,'utf-16le')
pwd = Rex::Text::to_ascii(pwd,'utf-16le')
ws = Rex::Text::to_ascii(ws,'utf-16le')
opt[:unicode] = false
end
if has_flag?(:UNICODE) and !opt[:unicode]
usr = Rex::Text::to_unicode(usr,'utf-16le')
pwd = Rex::Text::to_unicode(pwd,'utf-16le')
ws = Rex::Text::to_unicode(ws,'utf-16le')
opt[:unicode] = true
end
tgt = self.target_name
ti = self.target_info
chal = self[:challenge].serialize
if opt[:ntlmv2]
ar = { :ntlmv2_hash => NTLM::ntlmv2_hash(usr, pwd, tgt, opt),
:challenge => chal, :target_info => ti}
lm_res = NTLM::lmv2_response(ar, opt)
ntlm_res = NTLM::ntlmv2_response(ar, opt)
elsif has_flag?(:NTLM2_KEY)
ar = {:ntlm_hash => NTLM::ntlm_hash(pwd, opt), :challenge => chal}
lm_res, ntlm_res = NTLM::ntlm2_session(ar, opt)
else
lm_res = NTLM::lm_response(pwd, chal)
ntlm_res = NTLM::ntlm_response(pwd, chal)
end
Type3.create({
:lm_response => lm_res,
:ntlm_response => ntlm_res,
:domain => tgt,
:user => usr,
:workstation => ws,
:flag => self.flag
})
end
end
Type3 = Message.define{
string :sign, {:size => 8, :value => CONST::SSP_SIGN}
int32LE :type, {:value => 3}
security_buffer :lm_response, {:value => ""}
security_buffer :ntlm_response, {:value => ""}
security_buffer :domain, {:value => ""}
security_buffer :user, {:value => ""}
security_buffer :workstation, {:value => ""}
security_buffer :session_key, {:value => "", :active => false }
int64LE :flag, {:value => 0, :active => false }
}
class Type3
class << Type3
def parse(str)
t = new
t.parse(str)
t
end
def create(arg, opt ={})
t = new
t.lm_response = arg[:lm_response]
t.ntlm_response = arg[:ntlm_response]
t.domain = arg[:domain]
t.user = arg[:user]
t.workstation = arg[:workstation]
if arg[:session_key]
t.enable(:session_key)
t.session_key = arg[session_key]
end
if arg[:flag]
t.enable(:session_key)
t.enable(:flag)
t.flag = arg[:flag]
end
t
end
end#self
end
public
#those class method have been merged from lib/rex/smb/utils
#
# Process Type 3 NTLM Message (in Base64)
#
# from http://www.innovation.ch/personal/ronald/ntlm.html
#
# struct {
# byte protocol[8]; // 'N', 'T', 'L', 'M', 'S', 'S', 'P', '\0'
# byte type; // 0x03
# byte zero[3];
#
# short lm_resp_len; // LanManager response length (always 0x18)
# short lm_resp_len; // LanManager response length (always 0x18)
# short lm_resp_off; // LanManager response offset
# byte zero[2];
#
# short nt_resp_len; // NT response length (always 0x18)
# short nt_resp_len; // NT response length (always 0x18)
# short nt_resp_off; // NT response offset
# byte zero[2];
#
# short dom_len; // domain string length
# short dom_len; // domain string length
# short dom_off; // domain string offset (always 0x40)
# byte zero[2];
#
# short user_len; // username string length
# short user_len; // username string length
# short user_off; // username string offset
# byte zero[2];
#
# short host_len; // host string length
# short host_len; // host string length
# short host_off; // host string offset
# byte zero[6];
#
# short msg_len; // message length
# byte zero[2];
#
# short flags; // 0x8201
# byte zero[2];
#
# byte dom[*]; // domain string (unicode UTF-16LE)
# byte user[*]; // username string (unicode UTF-16LE)
# byte host[*]; // host string (unicode UTF-16LE)
# byte lm_resp[*]; // LanManager response
# byte nt_resp[*]; // NT response
# } type_3_message
#
def self.process_type3_message(message)
decode = Rex::Text.decode_base64(message.strip)
type = decode[8,1].unpack("C").first
if (type == 3)
lm_len = decode[12,2].unpack("v").first
lm_offset = decode[16,2].unpack("v").first
lm = decode[lm_offset, lm_len].unpack("H*").first
nt_len = decode[20,2].unpack("v").first
nt_offset = decode[24,2].unpack("v").first
nt = decode[nt_offset, nt_len].unpack("H*").first
dom_len = decode[28,2].unpack("v").first
dom_offset = decode[32,2].unpack("v").first
domain = decode[dom_offset, dom_len]
user_len = decode[36,2].unpack("v").first
user_offset = decode[40,2].unpack("v").first
user = decode[user_offset, user_len]
host_len = decode[44,2].unpack("v").first
host_offset = decode[48,2].unpack("v").first
host = decode[host_offset, host_len]
return domain, user, host, lm, nt
else
return "", "", "", "", ""
end
end
#
# Process Type 1 NTLM Messages, return a Base64 Type 2 Message
#
def self.process_type1_message(message, nonce = "\x11\x22\x33\x44\x55\x66\x77\x88", win_domain = 'DOMAIN',
win_name = 'SERVER', dns_name = 'server', dns_domain = 'example.com', downgrade = true)
dns_name = Rex::Text.to_unicode(dns_name + "." + dns_domain)
win_domain = Rex::Text.to_unicode(win_domain)
dns_domain = Rex::Text.to_unicode(dns_domain)
win_name = Rex::Text.to_unicode(win_name)
decode = Rex::Text.decode_base64(message.strip)
type = decode[8,1].unpack("C").first
if (type == 1)
# A type 1 message has been received, lets build a type 2 message response
reqflags = decode[12,4]
reqflags = reqflags.unpack("V").first
if (reqflags & CONST::REQUEST_TARGET) == CONST::REQUEST_TARGET
if (downgrade)
# At this time NTLMv2 and signing requirements are not supported
if (reqflags & CONST::NEGOTIATE_NTLM2_KEY) == CONST::NEGOTIATE_NTLM2_KEY
reqflags = reqflags - CONST::NEGOTIATE_NTLM2_KEY
end
if (reqflags & CONST::NEGOTIATE_ALWAYS_SIGN) == CONST::NEGOTIATE_ALWAYS_SIGN
reqflags = reqflags - CONST::NEGOTIATE_ALWAYS_SIGN
end
end
flags = reqflags + CONST::TARGET_TYPE_DOMAIN + CONST::TARGET_TYPE_SERVER
tid = true
tidoffset = 48 + win_domain.length
tidbuff =
[2].pack('v') + # tid type, win domain
[win_domain.length].pack('v') +
win_domain +
[1].pack('v') + # tid type, server name
[win_name.length].pack('v') +
win_name +
[4].pack('v') + # tid type, domain name
[dns_domain.length].pack('v') +
dns_domain +
[3].pack('v') + # tid type, dns_name
[dns_name.length].pack('v') +
dns_name
else
flags = CONST::NEGOTIATE_UNICODE + CONST::NEGOTIATE_NTLM
tid = false
end
type2msg = "NTLMSSP\0" + # protocol, 8 bytes
"\x02\x00\x00\x00" # type, 4 bytes
if (tid)
type2msg += # Target security info, 8 bytes. Filled if REQUEST_TARGET
[win_domain.length].pack('v') + # Length, 2 bytes
[win_domain.length].pack('v') # Allocated space, 2 bytes
end
type2msg +="\x30\x00\x00\x00" + # Offset, 4 bytes
[flags].pack('V') + # flags, 4 bytes
nonce + # the nonce, 8 bytes
"\x00" * 8 # Context (all 0s), 8 bytes
if (tid)
type2msg += # Target information security buffer. Filled if REQUEST_TARGET
[tidbuff.length].pack('v') + # Length, 2 bytes
[tidbuff.length].pack('v') + # Allocated space, 2 bytes
[tidoffset].pack('V') + # Offset, 4 bytes (usually \x48 + length of win_domain)
win_domain + # Target name data (domain in unicode if REQUEST_UNICODE)
# Target information data
tidbuff + # Type, 2 bytes
# Length, 2 bytes
# Data (in unicode if REQUEST_UNICODE)
"\x00\x00\x00\x00" # Terminator, 4 bytes, all \x00
end
type2msg = Rex::Text.encode_base64(type2msg).delete("\n") # base64 encode and remove the returns
else
# This is not a Type2 message
type2msg = ""
end
return type2msg
end
#
# Downgrading Type messages to LMv1/NTLMv1 and removing signing
#
def self.downgrade_type_message(message)
decode = Rex::Text.decode_base64(message.strip)
type = decode[8,1].unpack("C").first
if (type > 0 and type < 4)
reqflags = decode[12..15] if (type == 1 or type == 3)
reqflags = decode[20..23] if (type == 2)
reqflags = reqflags.unpack("V")
# Remove NEGOTIATE_NTLMV2_KEY and NEGOTIATE_ALWAYS_SIGN, this lowers the negotiation
# down to LMv1/NTLMv1.
if (reqflags & CONST::NEGOTIATE_NTLM2_KEY) == CONST::NEGOTIATE_NTLM2_KEY
reqflags = reqflags - CONST::NEGOTIATE_NTLM2_KEY
end
if (reqflags & CONST::NEGOTIATE_ALWAYS_SIGN) == CONST::NEGOTIATE_ALWAYS_SIGN
reqflags = reqflags - CONST::NEGOTIATE_ALWAYS_SIGN
end
# Return the flags back to the decode so we can base64 it again
flags = reqflags.to_s(16)
0.upto(8) do |idx|
if (idx > flags.length)
flags.insert(0, "0")
end
end
idx = 0
0.upto(3) do |cnt|
if (type == 2)
decode[23-cnt] = [flags[idx,1]].pack("C")
else
decode[15-cnt] = [flags[idx,1]].pack("C")
end
idx += 2
end
end
return Rex::Text.encode_base64(decode).delete("\n") # base64 encode and remove the returns
end
end
end
end
end
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