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New lib to deal with proxies from scripts.
This lib is being used on the proxy detection scripts, but can also be used to deal with proxy handshaking.
This commit is contained in:
joao
283
nselib/proxy.lua
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283
nselib/proxy.lua
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--- Functions for proxy testing
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-- @author Joao Correa <joao@livewire.com.br>
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-- @copyright Same as Nmap--See http://nmap.org/book/man-legal.html
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module(... or "proxy",package.seeall)
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require 'dns'
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require 'ipOps'
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-- Start of local functions
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--- check function, makes checkings for all valid returned status
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--- If any of the HTTP status below is found, the proxy is potentially open
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--- The script tries to split header from body before checking for status
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--@param result connection result
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--@return true if any of the status is found, otherwise false
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local function check_code(result)
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if result then
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local header
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if result:match( "\r?\n\r?\n" ) then
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result = result:match( "^(.-)\r?\n\r?\n(.*)$" )
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end
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if string.match(result:lower(),"^http/%d\.%d%s*200") then return true end
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if string.match(result:lower(),"^http/%d\.%d%s*30[12]") then return true end
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end
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return false
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end
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--- check pattern, searches a pattern inside a response with multiple lines
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--@param result Connection result
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--@param pattern The pattern to be searched
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--@return true if pattern is found, otherwise false
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local function check_pattern(result, pattern)
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local lines = stdnse.strsplit("\n", result)
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local i = 1
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local n = table.getn(lines)
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while true do
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if i > n then return false end
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if string.match(lines[i]:lower(),pattern:lower()) then return true end
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i = i + 1
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end
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end
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--- check, decides what kind of check should be done on the response,
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--- depending if a specific pattern is being used
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--@param result Connection result
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--@param pattern The pattern that should be checked (must be false, in case of
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--code check)
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--@return true, if the performed check returns true, otherwise false
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local function check(result, pattern)
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local s_pattern = false
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local s_code = check_code(result)
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if s_code and pattern then
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s_pattern = check_pattern(result, pattern)
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end
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return s_code, s_pattern
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end
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--- Performs a request to the web server and calls check to check if
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-- the response is a valid result
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--
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--@param socket The socket to send the request through
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--@param req The request to be sent
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--@param pattern The pattern to check for valid result
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--@return check_status True or false. If pattern was used, depends on pattern check result. If not, depends on code check result.
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--@return result The result of the request
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--@return code_status True or false. If pattern was used, returns the result of code checking for the same result. If pattern was not used, is nil.
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local function test(socket, req, pattern)
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local _, result, s_code, s_pattern
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socket:send(req)
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_, result = socket:receive()
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socket:close()
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s_code, s_pattern = check(result, pattern)
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if result and pattern then return s_pattern, result, s_code end
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if result then return s_code, result, nil end
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return false, nil, nil
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end
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--- Builds the GET request and calls test
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-- @param host The host table
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-- @param port The port table
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-- @param proxyType The proxy type to be tested, might be 'socks4', 'socks5' or 'http'
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-- @param test_url The url to send the request
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-- @param hostname The hostname of the server to send the request
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-- @param pattern The pattern to check for valid result
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-- @return the result of the function test (status and the request result)
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function test_get(host, port, proxyType, test_url, hostname, pattern)
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local socket = connectProxy(host, port, proxyType, hostname)
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if not socket then return false end
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local req = "GET " .. test_url .. " HTTP/1.0\r\nHost: " .. hostname .. "\r\n\r\n"
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stdnse.print_debug("GET Request: " .. req)
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return test(socket, req, pattern)
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end
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--- Builds the HEAD request and calls test
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-- @param host The host table
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-- @param port The port table
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-- @param proxyType The proxy type to be tested, might be 'socks4', 'socks5' or 'http'
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-- @param test_url The url te send the request
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-- @param hostname The hostname of the server to send the request
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-- @param pattern The pattern to check for valid result
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-- @return the result of the function test (status and the request result)
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function test_head(host, port, proxyType, test_url, hostname, pattern)
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local socket = connectProxy(host, port, proxyType, hostname)
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if not socket then return false end
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local req = "HEAD " .. test_url .. " HTTP/1.0\r\nHost: " .. hostname .. "\r\n\r\n"
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stdnse.print_debug("HEAD Request: " .. req)
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return test(socket, req, pattern)
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end
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--- Builds the CONNECT request and calls test
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-- @param host The host table
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-- @param port The port table
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-- @param proxyType The proxy type to be tested, might be 'socks4', 'socks5' or 'http'
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-- @param hostname The hostname of the server to send the request
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-- @return the result of the function test (status and the request result)
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function test_connect(host, port, proxyType, hostname)
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local socket = connectProxy(host, port, proxyType, hostname)
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if not socket then return false end
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local req = "CONNECT " .. hostname .. ":80 HTTP/1.0\r\n\r\n"
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stdnse.print_debug("CONNECT Request: " .. req)
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return test(socket, req, false)
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end
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--- Function that resolves IP address for hostname and
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--- returns it as hex values
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--@param hostname Hostname to resolve
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--@return Ip address of hostname in hex
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function hex_resolve(hostname)
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local a, b, c, d;
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local dns_status, ip = dns.query(hostname)
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if not dns_status then
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return false
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end
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local t, err = ipOps.get_parts_as_number(ip)
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if t and not err
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then a, b, c, d = unpack(t)
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else return false
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end
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local sip = string.format("%.2x ", a) .. string.format("%.2x ", b) .. string.format("%.2x ", c) .. string.format("%.2x ",d)
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return true, sip
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end
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--- Checks if any parameter was used in old or new syntax
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-- and return the parameters
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-- @return url the proxy.url parameter
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-- @return pattern the proxy.pattern parameter
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function return_args()
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local url = false
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local pattern = false
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if nmap.registry.args['proxy.url']
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then url = nmap.registry.args['proxy.url']
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elseif nmap.registry.args.proxy and nmap.registry.args.proxy.url
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then url = nmap.registry.args.proxy.url
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end
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if nmap.registry.args['proxy.pattern']
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then pattern = nmap.registry.args['proxy.pattern']
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elseif nmap.registry.args.proxy and nmap.registry.args.proxy.url
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then pattern = nmap.registry.args.proxy.pattern
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end
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return url, pattern
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end
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--- Creates a socket, performs proxy handshake if necessary
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--- and returns it
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-- @param host The host table
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-- @param port The port table
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-- @param proxyType A string with the proxy type. Might be "http","socks4" or "socks5"
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-- @param hostname The proxy destination hostname
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-- @return socket A socket with the handshake already done
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function connectProxy(host, port, proxyType, hostname)
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local socket = nmap.new_socket()
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socket:set_timeout(10000)
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local try = nmap.new_try(function() socket:close() end)
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try(socket:connect(host.ip, port.number))
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if proxyType == "http" then return socket end
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if proxyType == "socks4" then return socksHandshake(socket, 4, hostname) end
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if proxyType == "socks5" then return socksHandshake(socket, 5, hostname) end
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return false
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end
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--- Performs a socks handshake on a socket and returns it
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-- @param socket The socket where the handshake will be performed
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-- @param version The socks version (might be 4 or 5)
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-- @param hostname The proxy destination hostname
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-- @return socket A socket with the handshake already done
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function socksHandshake(socket, version, hostname)
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local resolve, sip, paystring, payload
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resolve, sip = hex_resolve(hostname)
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local try = nmap.new_try(function() socket:close() end)
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if not resolve then
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stdnse.print_debug("Unable to resolve hostname.")
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return false
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end
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if version == 4 then
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paystring = '04 01 00 50 ' .. sip .. ' 6e 6d 61 70 00'
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payload = bin.pack("H",paystring)
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try(socket:send(payload))
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local response = try(socket:receive())
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local request_status = string.byte(response, 2)
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if(request_status == 0x5a) then
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stdnse.print_debug("Socks4: Received \"Request Granted\" from proxy server\n")
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return socket
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end
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if(request_status == 0x5b) then
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stdnse.print_debug("Socks4: Received \"Request rejected or failed\" from proxy server")
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elseif (request_status == 0x5c) then
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stdnse.print_debug("Socks4: Received \"request failed because client is not running identd\" from proxy server")
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elseif (request_status == 0x5d) then
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stdnse.print_debug("Socks4: Received \"request failed because client's identd could not confirm" ..
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"\nthe user ID string in the request from proxy server")
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end
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return false
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end
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if version == 5 then
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local payload = bin.pack("H",'05 01 00')
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try(socket:send(payload))
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local auth = try(socket:receive())
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local r2 = string.byte(auth,2)
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-- If Auth is required, proxy is closed, skip next test
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if(r2 ~= 0x00) then
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stdnse.print_debug("Socks5: Authentication required")
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else
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-- If no Auth is required, try to estabilish connection
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stdnse.print_debug("Socks5: No authentication required")
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-- Socks5 second payload: Version, Command, Null, Address type, Ip-Address, Port number
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paystring = '05 01 00 01 ' .. sip .. '00 50'
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payload = bin.pack("H",paystring)
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try(socket:send(payload))
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local z = try(socket:receive())
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local request_status = string.byte(z, 2)
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if (request_status == 0x00) then
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stdnse.print_debug("Socks5: Received \"Request Granted\" from proxy server\n")
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return socket
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elseif(request_status == 0x01) then
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stdnse.print_debug("Socks5: Received \"General failure\" from proxy server")
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elseif (request_status == 0x02) then
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stdnse.print_debug("Socks5: Received \"Connection not allowed by ruleset\" from proxy server")
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elseif (request_status == 0x03) then
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stdnse.print_debug("Socks5: Received \"Network unreachable\" from proxy server")
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elseif (request_status == 0x04) then
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stdnse.print_debug("Socks5: Received \"Host unreachable\" from proxy server")
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elseif (request_status == 0x05) then
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stdnse.print_debug("Socks5: Received \"Connection refused by destination host\" from proxy server")
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elseif (request_status == 0x06) then
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stdnse.print_debug("Socks5: Received \"TTL Expired\" from proxy server")
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elseif (request_status == 0x07) then
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stdnse.print_debug("Socks5: Received \"command not supported / protocol error\" from proxy server")
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elseif (request_status == 0x08) then
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stdnse.print_debug("Socks5: Received \"Address type not supported\" from proxy server")
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end
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end
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return false
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end
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stdnse.print_debug("Unrecognized proxy type");
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return false
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end
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--- Checks if two different responses are equal,
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-- if true, the proxy server might be redirecting the requests
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-- to a default page
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--
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-- Functions slipts body from head before comparing, to avoid session
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-- variables, cookies...
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--
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-- @param resp1 A string with the response for the first request
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-- @param resp2 A string with the response for the second request
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-- @return bool true if both responses are equal, otherwise false
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function redirectCheck(resp1, resp2)
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local body1, body2, _
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if resp1:match( "\r?\n\r?\n" ) then
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local body1
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_, body1 = resp1:match( "^(.-)\r?\n\r?\n(.*)$" )
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if resp2:match( "\r?\n\r?\n" ) then
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_, body2 = resp2:match( "^(.-)\r?\n\r?\n(.*)$" )
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if body1 == body2 then
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return true
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end
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end
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end
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return false
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end
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