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f37ac44380
In addition to fitting better (brute library is the verb, creds library is the noun), this will allow creds.lua to use creds.Account internally where necessary (see subsequent commits) Also change old references to string argument "OPEN" into creds.State.VALID.
273 lines
7.3 KiB
Lua
273 lines
7.3 KiB
Lua
local brute = require "brute"
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local creds = require "creds"
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local nmap = require "nmap"
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local shortport = require "shortport"
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local stdnse = require "stdnse"
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local openssl = stdnse.silent_require "openssl"
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description = [[
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Performs brute force password auditing against Subversion source code control servers.
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]]
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---
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-- @usage
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-- nmap --script svn-brute --script-args svn-brute.repo=/svn/ -p 3690 <host>
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--
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-- @output
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-- PORT STATE SERVICE REASON
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-- 3690/tcp open svn syn-ack
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-- | svn-brute:
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-- | Accounts
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-- |_ patrik:secret => Login correct
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--
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-- Summary
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-- -------
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-- x The svn class contains the code needed to perform CRAM-MD5
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-- authentication
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-- x The Driver class contains the driver implementation used by the brute
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-- library
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--
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-- @args svn-brute.repo the Subversion repository against which to perform
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-- password guessing
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-- @args svn-brute.force force password guessing when service is accessible
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-- both anonymously and through authentication
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--
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-- Version 0.1
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-- Created 07/12/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
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--
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author = "Patrik Karlsson"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"intrusive", "brute"}
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portrule = shortport.port_or_service(3690, "svnserve", "tcp", "open")
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svn =
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{
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svn_client = "nmap-brute v0.1",
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new = function(self, host, port, repo)
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local o = {}
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setmetatable(o, self)
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self.__index = self
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o.host = host
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o.port = port
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o.repo = repo
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o.invalid_users = {}
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return o
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end,
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--- Connects to the SVN - repository
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--
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-- @return status true on success, false on failure
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-- @return err string containing an error message on failure
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connect = function(self)
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local repo_url = ( "svn://%s/%s" ):format(self.host.ip, self.repo)
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local status, msg
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self.socket = nmap.new_socket()
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local result
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status, result = self.socket:connect(self.host.ip, self.port.number, "tcp")
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if( not(status) ) then
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return false, result
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end
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status, msg = self.socket:receive_bytes(1)
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if ( not(status) or not( msg:match("^%( success") ) ) then
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return false, "Banner reports failure"
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end
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msg = ("( 2 ( edit-pipeline svndiff1 absent-entries depth mergeinfo log-revprops ) %d:%s %d:%s ( ) ) "):format( #repo_url, repo_url, #self.svn_client, self.svn_client )
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status = self.socket:send( msg )
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if ( not(status) ) then
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return false, "Send failed"
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end
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status, msg = self.socket:receive_bytes(1)
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if ( not(status) ) then
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return false, "Receive failed"
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end
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if ( msg:match("%( success") ) then
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local tmp = msg:match("%( success %( %( ([%S+%s*]-) %)")
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if ( not(tmp) ) then return false, "Failed to detect authentication" end
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tmp = stdnse.strsplit(" ", tmp)
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self.auth_mech = {}
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for _, v in pairs(tmp) do self.auth_mech[v] = true end
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elseif ( msg:match("%( failure") ) then
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return false
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end
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return true
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end,
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--- Attempts to login to the SVN server
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--
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-- @param username string containing the login username
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-- @param password string containing the login password
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-- @return status, true on success, false on failure
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-- @return err string containing error message on failure
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login = function( self, username, password )
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local status, msg
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local challenge, digest
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if ( self.auth_mech["CRAM-MD5"] ) then
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msg = "( CRAM-MD5 ( ) ) "
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status = self.socket:send( msg )
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status, msg = self.socket:receive_bytes(1)
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if ( not(status) ) then
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return false, "error"
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end
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challenge = msg:match("<.+>")
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if ( not(challenge) ) then
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return false, "Failed to read challenge"
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end
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digest = stdnse.tohex(openssl.hmac('md5', password, challenge))
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msg = ("%d:%s %s "):format(#username + 1 + #digest, username, digest)
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self.socket:send( msg )
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status, msg = self.socket:receive_bytes(1)
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if ( not(status) ) then
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return false, "error"
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end
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if ( msg:match("Username not found") ) then
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return false, "Username not found"
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elseif ( msg:match("success") ) then
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return true, "Authentication success"
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else
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return false, "Authentication failed"
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end
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else
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return false, "Unsupported auth-mechanism"
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end
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end,
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--- Close the SVN connection
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--
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-- @return status true on success, false on failure
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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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Driver =
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{
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new = function(self, host, port, invalid_users )
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local o = {}
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setmetatable(o, self)
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self.__index = self
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o.host = host
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o.port = port
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o.repo = stdnse.get_script_args('svn-brute.repo')
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o.invalid_users = invalid_users
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return o
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end,
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connect = function( self )
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local status, msg
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self.svn = svn:new( self.host, self.port, self.repo )
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status, msg = self.svn:connect()
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if ( not(status) ) then
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local err = brute.Error:new( "Failed to connect to SVN server" )
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-- This might be temporary, set the retry flag
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err:setRetry( true )
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return false, err
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end
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return true
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end,
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disconnect = function( self )
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self.svn:close()
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end,
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--- Attempts to login to the SVN server
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--
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-- @param username string containing the login username
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-- @param password string containing the login password
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-- @return status, true on success, false on failure
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-- @return brute.Error object on failure
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-- creds.Account object on success
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login = function( self, username, password )
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local status, msg
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if ( self.invalid_users[username] ) then
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return false, brute.Error:new( "User is invalid" )
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end
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status, msg = self.svn:login( username, password )
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if ( not(status) and msg:match("Username not found") ) then
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self.invalid_users[username] = true
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return false, brute.Error:new("Username not found")
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elseif ( status and msg:match("success") ) then
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return true, creds.Account:new(username, password, creds.State.VALID)
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else
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return false, brute.Error:new( "Incorrect password" )
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end
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end,
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--- Verifies whether the repository is valid
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--
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-- @return status, true on success, false on failure
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-- @return err string containing an error message on failure
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check = function( self )
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local svn = svn:new( self.host, self.port, self.repo )
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local status = svn:connect()
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svn:close()
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if ( status ) then
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return true
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else
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return false, ("Failed to connect to SVN repository (%s)"):format(self.repo)
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end
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end,
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}
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action = function(host, port)
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local status, accounts
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local repo = stdnse.get_script_args('svn-brute.repo')
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local force = stdnse.get_script_args('svn-brute.force')
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if ( not(repo) ) then
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return "No repository specified (see svn-brute.repo)"
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end
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local svn = svn:new( host, port, repo )
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local status = svn:connect()
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if ( status and svn.auth_mech["ANONYMOUS"] and not(force) ) then
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return " \n Anonymous SVN detected, no authentication needed"
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end
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if ( not(svn.auth_mech) or not( svn.auth_mech["CRAM-MD5"] ) ) then
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return " \n No supported authentication mechanisms detected"
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end
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local invalid_users = {}
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local engine = brute.Engine:new(Driver, host, port, invalid_users)
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engine.options.script_name = SCRIPT_NAME
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status, accounts = engine:start()
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if( not(status) ) then
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return accounts
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end
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return accounts
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end
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