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o [NSE] Added the library rpcap and the scripts rpcap-brute and rpcap-info
which perform brute force password guessing and extract information from the WinPcap Remote Packet Capture daemon. [Patrik]
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patrik
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437
nselib/rpcap.lua
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437
nselib/rpcap.lua
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---
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-- This library implements the fundamentals needed to communicate with the
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-- WinPcap Remote Capture Deamon. It currently supports authenticating to
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-- the service using either NULL-, or Password-based authentication.
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-- In addition it has the capabilities to list the interfaces that may be
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-- used for sniffing.
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--
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-- The library consist of classes handling <code>Request</code> and classes
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-- handling <code>Response</code>. The communication with the service is
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-- handled by the <code>Comm</code> class, and the main interface for script
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-- writers is kept under the <code>Helper</code> class.
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--
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-- The following code snipplet illustrates how to connect to the service and
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-- extract information about network interfaces:
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-- <code>
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-- local helper = rpcap.Helper:new(host, port)
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-- helper:connect()
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-- helper:login()
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-- helper:findAllInterfaces()
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-- helper:close()
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-- </code>
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--
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-- For a more complete example, consult the rpcap-info.nse script.
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--
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-- @author "Patrik Karlsson <patrik@cqure.net>"
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module(... or "rpcap", package.seeall)
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require 'ipops'
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require 'match'
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RPCAP = {
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MessageType = {
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ERROR = 1,
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FIND_ALL_INTERFACES = 2,
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AUTH_REQUEST = 8,
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},
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-- Holds the two supported authentication mechanisms PWD and NULL
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Authentication = {
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PWD = {
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new = function(self, username, password)
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local o = {
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type = 1,
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username = username,
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password = password,
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}
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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__tostring = function(self)
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local DUMMY = 0
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return bin.pack(">SSSSAA", self.type, DUMMY, #self.username, #self.password, self.username, self.password)
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end,
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},
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NULL = {
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new = function(self)
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local o = {
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type = 0,
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}
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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__tostring = function(self)
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local DUMMY = 0
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return bin.pack(">SSSS", self.type, DUMMY, 0, 0)
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end,
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}
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},
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-- The common request and response header
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Header = {
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size = 8,
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new = function(self, type, value, length)
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local o = {
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version = 0,
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type = type,
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value= value or 0,
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length = length or 0
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}
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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parse = function(data)
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local header = RPCAP.Header:new()
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local pos
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pos, header.version, header.type, header.value, header.length = bin.unpack(">CCSI", data)
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return header
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end,
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__tostring = function(self)
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return bin.pack(">CCSI", self.version, self.type, self.value, self.length)
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end,
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},
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-- The implemented request types are kept here
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Request = {
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Authentication = {
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new = function(self, data)
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local o = {
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header = RPCAP.Header:new(RPCAP.MessageType.AUTH_REQUEST, nil, #data),
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data = data,
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}
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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__tostring = function(self)
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return tostring(self.header) .. tostring(self.data)
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end,
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},
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FindAllInterfaces = {
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new = function(self)
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local o = {
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header = RPCAP.Header:new(RPCAP.MessageType.FIND_ALL_INTERFACES)
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}
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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__tostring = function(self)
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return tostring(self.header)
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end,
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}
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},
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-- Parsers for responses are kept here
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Response = {
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Authentication = {
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new = function(self)
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local o = { }
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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parse = function(data)
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local resp = RPCAP.Response.Authentication:new()
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local pos = RPCAP.Header.size + 1
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resp.header = RPCAP.Header.parse(data)
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return resp
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end
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},
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Error = {
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new = function(self)
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local o = { }
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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parse = function(data)
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local err = RPCAP.Response.Error:new()
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local pos = RPCAP.Header.size + 1
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err.header = RPCAP.Header.parse(data)
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pos, err.error = bin.unpack("A" .. err.header.length, data, pos)
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return err
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end
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},
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FindAllInterfaces = {
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new = function(self)
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local o = { }
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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parse = function(data)
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-- Each address is made up of 4 128 byte fields, this function
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-- parses these fields and return the response, if it
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-- understands it. Otherwise it simply increases the pos by the
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-- correct offset, to get us to the next field.
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local function parseField(data, pos)
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local offset = pos
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local family, port
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pos, family, port = bin.unpack(">SS", data, pos)
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if ( family == 0x0017 ) then
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-- not sure why...
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pos = pos + 4
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local ipv6
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pos, ipv6 = bin.unpack("B16", data, pos)
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return offset + 128, ipOps.bin_to_ip(ipv6)
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elseif ( family == 0x0002 ) then
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local ipv4
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pos, ipv4 = bin.unpack("B4", data, pos)
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return offset + 128, ipOps.bin_to_ip(ipv4)
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end
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return offset + 128, nil
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end
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-- Parses one of X addresses returned for an interface
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local function parseAddress(data, pos)
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local fields = {"ip", "netmask", "bcast", "p2p"}
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local addr = {}
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for _, f in ipairs(fields) do
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pos, addr[f] = parseField(data, pos)
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end
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return pos, addr
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end
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local resp = RPCAP.Response.FindAllInterfaces:new()
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local pos = RPCAP.Header.size + 1
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resp.header = RPCAP.Header.parse(data)
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resp.ifaces = {}
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for i=1, resp.header.value do
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local name_len, desc_len, iface_flags, addr_count, dummy
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pos, name_len, desc_len, iface_flags, addr_count, dummy = bin.unpack(">SSISS", data, pos)
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local name, desc
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pos, name, desc = bin.unpack("A" .. name_len .. "A" .. desc_len, data, pos)
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local addrs = {}
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for j=1, addr_count do
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local addr
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pos, addr = parseAddress(data, pos)
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local cidr
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if ( addr.netmask ) then
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local bits = ipOps.ip_to_bin(addr.netmask)
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local ones = bits:match("^(1*)")
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cidr = #ones
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table.insert(addrs, ("%s/%d"):format(addr.ip,cidr))
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else
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table.insert(addrs, addr.ip)
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end
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end
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table.insert(resp.ifaces, { name = name, desc = desc, addrs = addrs })
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end
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return resp
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end,
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}
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}
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}
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-- Maps packet types to classes
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RPCAP.TypeToClass = {
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[1] = RPCAP.Response.Error,
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[130] = RPCAP.Response.FindAllInterfaces,
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[136] = RPCAP.Response.Authentication,
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}
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-- The communication class
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Comm = {
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-- Creates a new instance of the Comm class
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-- @param host table
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-- @param port table
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-- @return o instance of Comm
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new = function(self, host, port)
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local o = { host = host, port = port, socket = nmap.new_socket() }
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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-- Connects the socket to the server
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connect = function(self)
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return self.socket:connect(self.host, self.port)
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end,
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-- Sends an instance of the request class to the server
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-- @param req class instance
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-- @return status true on success, false on failure
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-- @return err string containing error message if status is false
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send = function(self, req)
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return self.socket:send(req)
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end,
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-- receives a packet and attempts to parse it if it has a supported parser
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-- in RPCAP.TypeToClass
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-- @return status true on success, false on failure
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-- @return resp instance of a Response class or
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-- err string containing the error message
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recv = function(self)
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local status, hdr_data = self.socket:receive_buf(match.numbytes(RPCAP.Header.size), true)
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if ( not(status) ) then
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return status, data
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end
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local header = RPCAP.Header.parse(hdr_data)
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if ( not(header) ) then
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return false, "rpcap: Failed to parse header"
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end
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local status, data = self.socket:receive_buf(match.numbytes(header.length), true)
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if ( not(status) ) then
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return false, "rpcap: Failed to read packet data"
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end
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if ( RPCAP.TypeToClass[header.type] ) then
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local resp = RPCAP.TypeToClass[header.type].parse(hdr_data .. data)
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if ( resp ) then
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return true, resp
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end
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end
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return false, "Failed to receive response from server"
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end,
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-- Sends and request and receives the response
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-- @param req the instance of the Request class to send
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-- @return status true on success, false on failure
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-- @return resp instance of a Response class or
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-- err string containing the error message
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exch = function(self, req)
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local status, data = self:send(tostring(req))
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if ( not(status) ) then
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return status, data
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end
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return self:recv()
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end,
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-- closes the socket
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close = function(self)
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return self.socket:close()
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end,
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}
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Helper = {
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-- Creates a new instance of the Helper class
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-- @param host table
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-- @param port table
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-- @return o instance of Helper
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new = function(self, host, port)
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local o = {
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host = host,
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port = port,
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comm = Comm:new(host, port)
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}
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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-- Connects to the server
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connect = function(self)
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return self.comm:connect(self.host, self.port)
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end,
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-- Authenticates to the service, in case no username or password is given
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-- NULL authentication is assumed.
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-- @param username [optional]
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-- @param password [optional]
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-- @return status true on success, false on failure
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-- @return err string containing error mesage on failure
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login = function(self, username, password)
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local auth
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if ( username and password ) then
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auth = RPCAP.Authentication.PWD:new(username, password)
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else
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auth = RPCAP.Authentication.NULL:new()
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end
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local req = RPCAP.Request.Authentication:new(tostring(auth))
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local status, resp = self.comm:exch(req)
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if ( not(status) ) then
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return false, resp
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end
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if ( status and resp.error ) then
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return false, resp.error
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end
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return true
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end,
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-- Requests a list of all interfaces
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-- @return table containing interfaces and addresses
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findAllInterfaces = function(self)
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local req = RPCAP.Request.FindAllInterfaces:new()
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local status, resp = self.comm:exch(req)
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if ( not(status) ) then
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return false, resp
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end
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local results = {}
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for _, iface in ipairs(resp.ifaces) do
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local entry = {}
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entry.name = iface.name
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table.insert(entry, iface.desc)
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table.insert(entry, { name = "Addresses", iface.addrs })
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table.insert(results, entry)
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end
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return true, results
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end,
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-- Closes the connection to the server
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close = function(self)
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return self.comm:close()
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end,
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}
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