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local brute = require "brute"
local comm = require "comm"
local creds = require "creds"
local shortport = require "shortport"
local stdnse = require "stdnse"
description=[[
Performs brute force password auditing against IRC (Internet Relay Chat) servers.
]]
---
-- @usage
-- nmap --script irc-brute -p 6667 <ip>
--
-- @output
-- PORT STATE SERVICE
-- 6667/tcp open irc
-- | irc-brute:
-- | Accounts
-- | password - Valid credentials
-- | Statistics
-- |_ Performed 1927 guesses in 36 seconds, average tps: 74
--
--
-- Version 0.1
-- Created 26/10/2011 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
--
author = "Patrik Karlsson"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories={"brute","intrusive"}
portrule = shortport.port_or_service({6666,6667,6697,6679},{"irc","ircs"})
Driver = {
new = function(self, host, port, opts)
local o = { host = host, port = port, opts = opts or {} }
setmetatable(o, self)
self.__index = self
return o
end,
connect = function(self)
-- the high timeout should take delays from ident into consideration
local s, r, opts, _ = comm.tryssl(self.host,
self.port,
'',
{ timeout = self.opts.timeout or 10000 } )
if ( not(s) ) then
return false, "Failed to connect to server"
end
self.socket = s
return true
end,
login = function(self, _, password)
local msg = ("PASS %s\r\nNICK nmap_brute\r\nUSER anonymous 0 * :Nmap brute\r\n"):format(password)
local status, data = self.socket:send(msg)
local success = false
if ( not(status) ) then
local err = brute.Error:new( data )
-- This might be temporary, set the retry flag
err:setRetry( true )
return false, err
end
repeat
local status, response = self.socket:receive_buf("\r?\n", false)
-- we check for the RPL_WELCOME message, if we don't see it,
-- we failed to authenticate
if ( status and response:match("^:.-%s(%d*)%s") == "001" ) then
success = true
end
until(not(status))
if (success) then
return true, creds.Account:new("", password, creds.State.VALID)
end
return false, brute.Error:new("Incorrect password")
end,
disconnect = function(self) return self.socket:close() end,
}
local function random_nick()
return stdnse.generate_random_string(9, "abcdefghijklmnopqrstuvwxyz")
end
local function needsPassword(host, port)
local msg = ("NICK %s\r\nUSER anonymous 0 * :Nmap brute\r\n"):format(random_nick())
local s, r, opts, _ = comm.tryssl(host, port, msg, { timeout = 15000 } )
local err, code
repeat
local status, response = s:receive_buf("\r?\n", false)
if ( status ) then
code = tonumber(response:match("^:.-%s(%d*)%s"))
-- break after first code
if (code == 001 ) then
err = "The IRC service does not require authentication"
break
elseif( code ) then
break
end
end
until(not(status))
if (code == 464) then
return true
end
if ( code ) then
return false, ("Failed to check password requirements, unknown code (%d)"):format(code)
else
return false, "Failed to check password requirements"
end
end
action = function(host, port)
local status, err = needsPassword(host, port)
if ( not(status) ) then
return stdnse.format_output(false, err)
end
local engine = brute.Engine:new(Driver, host, port)
engine.options.script_name = SCRIPT_NAME
engine.options.firstonly = true
engine.options.passonly = true
local result
status, result = engine:start()
return result
end
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