o [NSE] Added authentication support to MongoDB library and modified existing

scripts to support it. Added the script mongodb-brute to perform password
  brute force guessing. [Patrik]

CHANGELOG

@@ -1,5 +1,9 @@
 # Nmap Changelog ($Id$); -*-text-*-
 
+o [NSE] Added authentication support to MongoDB library and modified existing
+  scripts to support it. Added the script mongodb-brute to perform password
+  brute force guessing. [Patrik]
+
 o Added a --nsock-engine option to nmap, nping and ncat to enforce use of a
   given nsock IO engine. [Henri]
 

nselib/mongodb.lua

@@ -4,17 +4,27 @@
 -- @author Martin Holst Swende
 -- @copyright Same as Nmap--See http://nmap.org/book/man-legal.html
 --
--- Version 0.1
+-- Version 0.2
+--
+-- @args mongodb.db - the database to use for authentication
 
 -- Created 01/13/2010 - v0.1 - created by Martin Holst Swende <martin@swende.se>
+-- Revised 01/03/2012 - v0.2 - added authentication support <patrik@cqure.net>
+
 module("mongodb", package.seeall)
 require("bin")
---require("bson")
+stdnse.silent_require "openssl"
+
+
+-- this is not yet widely implemented but at least used for authentication
+-- ideally, it would be used to set the database against which operations,
+-- that do not require a specific database, should run
+local arg_DB = stdnse.get_script_args("mongodb.db")
 
 -- Some lazy shortcuts
 
 local function dbg(str,...)
-	stdnse.print_debug("MngoDb:"..str, unpack(arg))
+	stdnse.print_debug(3, "MngoDb:"..str, unpack(arg))
 end
 --local dbg =stdnse.print_debug
 
@@ -96,17 +106,23 @@ end
 --@return result : a string of binary data OR error message
 function toBson(dict)
     
-        local elements = ""
+	local elements = ""
 	--Put id first
 	if dict._id then
 		local status,res = _element_to_bson("_id", dict._id)
 		if not status then return false, res end
 		elements = elements..res
+	elseif ( dict._cmd ) then
+		for k, v in pairs(dict._cmd) do
+			local status,res = _element_to_bson(k, v)
+			if not status then return false, res end
+			elements = elements..res
+		end
 	end
 	--Concatenate binary values
 	for key, value in pairs( dict ) do
-		dbg("dictionary to bson : key,value =(%s,%s)",key,value)
-		if key ~= "_id" then
+		if key ~= "_id" and key ~= "_cmd" then
+			dbg("dictionary to bson : key,value =(%s,%s)",key,value)
 			local status,res = _element_to_bson(key,value)
 			if not status then return false, res end
 			elements = elements..res
@@ -463,7 +479,6 @@ function buildInfoQuery(responseTo)
 	local query = {buildinfo = 1}
 	return createQuery(collectionName, query)
 end
-
 --Reads an int32 from data
 --@return int32 value
 --@return data unread
@@ -578,6 +593,38 @@ function query(socket, data)
 	end
 	return true,result, residualData
 end
+
+function login(socket, db, username, password)
+
+	local collectionName = ("%s.$cmd"):format(arg_DB or db)
+	local query = { getnonce = 1 }
+	local status, packet = createQuery(collectionName, query)
+	local response
+	status, response = mongodb.query(socket, packet)
+	if ( not(status) or not(response.nonce) ) then
+		return false, "Failed to retrieve nonce"
+	end
+	
+	local nonce = response.nonce
+	local pwdigest = stdnse.tohex(openssl.md5(username .. ':mongo:' ..password))
+	local digest = stdnse.tohex(openssl.md5(nonce .. username .. pwdigest))
+	
+	query = { user = username, nonce = nonce, key = digest }
+	query._cmd = { authenticate = 1 }
+
+	local status, packet = createQuery(collectionName, query)
+	status, response = mongodb.query(socket, packet)
+	if ( not(status) ) then
+		return status, response
+	elseif ( response.errmsg == "auth fails" ) then
+		return false, "Authentication failed"
+	elseif ( response.errmsg ) then
+		return false, response.errmsg
+	end
+	return status, response
+end
+
+
 --- Converts a quert result as received from MongoDB query into nmap "result" table
 -- @param resultTable table as returned from a quer
 -- @return table suitable for <code>stdnse.format_output</code>

scripts/mongodb-brute.nse

@@ -0,0 +1,101 @@
+description = [[
+Performs brute force password guessing against the MongoDB database.
+]]
+
+---
+-- @usage
+-- nmap -p 27017 <ip> --script mongodb-brute
+--
+-- @output
+-- PORT      STATE SERVICE
+-- 27017/tcp open  mongodb
+-- | mongodb-brute: 
+-- |   Accounts
+-- |     root:Password1 - Valid credentials
+-- |   Statistics
+-- |_    Performed 3542 guesses in 9 seconds, average tps: 393
+--
+
+require 'brute'
+require 'mongodb'
+require 'shortport'
+
+author = "Patrik Karlsson"
+license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
+categories = {"intrusive", "brute"}
+
+local arg_db = stdnse.get_script_args(SCRIPT_NAME .. ".db") or "admin"
+
+portrule = shortport.port_or_service({27017}, {"mongodb"})
+
+Driver = {
+	
+	new = function(self, host, port, options)
+		local o = { host = host, port = port, sock = nmap.new_socket() }
+		setmetatable(o, self)
+		self.__index = self
+		return o
+	end,
+	
+	connect = function(self)
+		return self.sock:connect(self.host, self.port)
+	end,
+	
+	login = function(self, username, password)
+		local status, resp = mongodb.login(self.sock, arg_db, username, password)
+		if ( status ) then
+			return true, brute.Account:new(username, password, creds.State.VALID)
+		elseif ( resp ~= "Authentication failed" ) then
+			local err = brute.Error:new( err )
+			err:setRetry( true )
+			return false, err					
+		end
+		return false, brute.Error:new( "Incorrect password" )
+	end,
+	
+	disconnect = function(self)
+		return self.sock:close()
+	end,
+	
+}
+
+local function needsAuth(host, port)
+	local socket = nmap.new_socket()
+	local status, result = socket:connect(host, port)
+	if ( not(status) ) then
+		return false, "Failed to connect to server"
+	end
+
+	local packet
+	status, packet = mongodb.listDbQuery()
+	if ( not(status) ) then
+		return false, result
+	end
+	
+	--- Send packet
+	status, result = mongodb.query(socket, packet)
+	if ( not(status) ) then
+		return false, result
+	end
+	
+	socket:close()
+	if ( status and result.errmsg ) then
+		return true
+	end
+	return false
+end
+
+action = function(host, port)
+
+	if ( not(needsAuth(host, port)) ) then
+		return "No authentication needed"
+	end
+
+	local engine = brute.Engine:new(Driver, host, port )
+	
+	engine.options.script_name = SCRIPT_NAME
+	engine.options.firstonly = true
+	status, result = engine:start()
+
+	return result
+end

scripts/mongodb-databases.nse

@@ -29,18 +29,22 @@ Attempts to get a list of tables from a MongoDB database.
 -- |       name = admin
 -- |_  totalSize = 167772160
 
--- version 0.1
+-- version 0.2
 -- Created 01/12/2010 - v0.1 - created by Martin Holst Swende <martin@swende.se>
-
+-- Revised 01/03/2012 - v0.2 - added authentication support <patrik@cqure.net>
 
 author = "Martin Holst Swende"
 license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
 categories = {"default", "discovery", "safe"}
 
+dependencies = {"mongodb-brute"}
+
+require "creds"
 require "mongodb"
 require "shortport"
 
 portrule = shortport.port_or_service({27017}, {"mongodb"})
+
 function action(host,port)
 
 	local socket = nmap.new_socket()
@@ -56,6 +60,19 @@ function action(host,port)
 
 	try( socket:connect(host, port) )
 	
+	-- uglyness to allow creds.mongodb to work, as the port is not recognized
+	-- as mongodb, unless a service scan was run
+	local ps = port.service
+	port.service = 'mongodb'
+	local c = creds.Credentials:new(creds.ALL_DATA, host, port)
+	for cred in c:getCredentials(creds.State.VALID + creds.State.PARAM) do
+		local status, err = mongodb.login(socket, "admin", cred.user, cred.pass)
+		if ( not(status) ) then
+			return err
+		end
+	end
+	port.service = ps
+	
 	local req, result, packet, err, status
 	--Build packet
 	status, packet = mongodb.listDbQuery()

scripts/mongodb-info.nse

@@ -41,18 +41,25 @@ Attempts to get build info and server status from a MongoDB database.
 -- |       note = fields vary by platform
 -- |_      page_faults = 0
 
--- version 0.2
+-- version 0.3
 -- Created 01/12/2010 - v0.1 - created by Martin Holst Swende <martin@swende.se>
+-- Revised 01/03/2012 - v0.3 - added authentication support <patrik@cqure.net>
 
 
 author = "Martin Holst Swende"
 license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
 categories = {"default", "discovery", "safe"}
 
+dependencies = {"mongodb-brute"}
+
+require "creds"
 require "mongodb"
 require "shortport"
 
+local arg_db = stdnse.get_script_args(SCRIPT_NAME .. ".db") or "admin"
+
 portrule = shortport.port_or_service({27017}, {"mongodb"})
+
 function action(host,port)
 
 	local socket = nmap.new_socket()
@@ -68,9 +75,22 @@ function action(host,port)
 
 	try( socket:connect(host, port) )
 	
-	local req, status, statusresponse, buildinfo, packet, err
+	local req, statusresponse, buildinfo, err
 	
-	status, packet = mongodb.serverStatusQuery()
+	-- uglyness to allow creds.mongodb to work, as the port is not recognized
+	-- as mongodb, unless a service scan was run
+	local ps = port.service
+	port.service = 'mongodb'
+	local c = creds.Credentials:new(creds.ALL_DATA, host, port)
+	for cred in c:getCredentials(creds.State.VALID + creds.State.PARAM) do
+		local status, err = mongodb.login(socket, arg_db, cred.user, cred.pass)
+		if ( not(status) ) then
+			return err
+		end
+	end
+	port.service = ps
+	
+	local status, packet = mongodb.serverStatusQuery()
 	if not status then return packet end
 	
 	status,statQResult = mongodb.query(socket, packet)

scripts/script.db

@@ -183,6 +183,7 @@ Entry { filename = "membase-http-info.nse", categories = { "discovery", "safe",
 Entry { filename = "memcached-info.nse", categories = { "discovery", "safe", } }
 Entry { filename = "metasploit-xmlrpc-brute.nse", categories = { "brute", "intrusive", } }
 Entry { filename = "modbus-discover.nse", categories = { "discovery", "intrusive", } }
+Entry { filename = "mongodb-brute.nse", categories = { "brute", "intrusive", } }
 Entry { filename = "mongodb-databases.nse", categories = { "default", "discovery", "safe", } }
 Entry { filename = "mongodb-info.nse", categories = { "default", "discovery", "safe", } }
 Entry { filename = "ms-sql-brute.nse", categories = { "brute", "intrusive", } }