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local brute = require "brute"
local creds = require "creds"
local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
local stringaux = require "stringaux"
local openssl = stdnse.silent_require "openssl"
description = [[
Performs brute force password auditing against Subversion source code control servers.
]]
---
-- @usage
-- nmap --script svn-brute --script-args svn-brute.repo=/svn/ -p 3690 <host>
--
-- @output
-- PORT STATE SERVICE REASON
-- 3690/tcp open svn syn-ack
-- | svn-brute:
-- | Accounts
-- |_ patrik:secret => Login correct
--
-- Summary
-- -------
-- x The svn class contains the code needed to perform CRAM-MD5
-- authentication
-- x The Driver class contains the driver implementation used by the brute
-- library
--
-- @args svn-brute.repo the Subversion repository against which to perform
-- password guessing
-- @args svn-brute.force force password guessing when service is accessible
-- both anonymously and through authentication
--
-- Version 0.1
-- Created 07/12/2010 - 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 = {"intrusive", "brute"}
portrule = shortport.port_or_service(3690, "svnserve", "tcp", "open")
svn =
{
svn_client = "nmap-brute v0.1",
new = function(self, host, port, repo)
local o = {}
setmetatable(o, self)
self.__index = self
o.host = host
o.port = port
o.repo = repo
o.invalid_users = {}
return o
end,
--- Connects to the SVN - repository
--
-- @return status true on success, false on failure
-- @return err string containing an error message on failure
connect = function(self)
local repo_url = ( "svn://%s/%s" ):format(self.host.ip, self.repo)
local status, msg
self.socket = brute.new_socket()
local result
status, result = self.socket:connect(self.host, self.port)
if( not(status) ) then
return false, result
end
status, msg = self.socket:receive_bytes(1)
if ( not(status) or not( msg:match("^%( success") ) ) then
return false, "Banner reports failure"
end
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 )
status = self.socket:send( msg )
if ( not(status) ) then
return false, "Send failed"
end
status, msg = self.socket:receive_bytes(1)
if ( not(status) ) then
return false, "Receive failed"
end
if ( msg:match("%( success") ) then
local tmp = msg:match("%( success %( %( ([%S+%s*]-) %)")
if ( not(tmp) ) then return false, "Failed to detect authentication" end
tmp = stringaux.strsplit(" ", tmp)
self.auth_mech = {}
for _, v in pairs(tmp) do self.auth_mech[v] = true end
elseif ( msg:match("%( failure") ) then
return false
end
return true
end,
--- Attempts to login to the SVN server
--
-- @param username string containing the login username
-- @param password string containing the login password
-- @return status, true on success, false on failure
-- @return err string containing error message on failure
login = function( self, username, password )
local status, msg
local challenge, digest
if ( self.auth_mech["CRAM-MD5"] ) then
msg = "( CRAM-MD5 ( ) ) "
status = self.socket:send( msg )
status, msg = self.socket:receive_bytes(1)
if ( not(status) ) then
return false, "error"
end
challenge = msg:match("<.+>")
if ( not(challenge) ) then
return false, "Failed to read challenge"
end
digest = stdnse.tohex(openssl.hmac('md5', password, challenge))
msg = ("%d:%s %s "):format(#username + 1 + #digest, username, digest)
self.socket:send( msg )
status, msg = self.socket:receive_bytes(1)
if ( not(status) ) then
return false, "error"
end
if ( msg:match("Username not found") ) then
return false, "Username not found"
elseif ( msg:match("success") ) then
return true, "Authentication success"
else
return false, "Authentication failed"
end
else
return false, "Unsupported auth-mechanism"
end
end,
--- Close the SVN connection
--
-- @return status true on success, false on failure
close = function(self)
return self.socket:close()
end,
}
Driver =
{
new = function(self, host, port, invalid_users )
local o = {}
setmetatable(o, self)
self.__index = self
o.host = host
o.port = port
o.repo = stdnse.get_script_args('svn-brute.repo')
o.invalid_users = invalid_users
return o
end,
connect = function( self )
local status, msg
self.svn = svn:new( self.host, self.port, self.repo )
status, msg = self.svn:connect()
if ( not(status) ) then
local err = brute.Error:new( "Failed to connect to SVN server" )
-- This might be temporary, set the retry flag
err:setRetry( true )
return false, err
end
return true
end,
disconnect = function( self )
self.svn:close()
end,
--- Attempts to login to the SVN server
--
-- @param username string containing the login username
-- @param password string containing the login password
-- @return status, true on success, false on failure
-- @return brute.Error object on failure
-- creds.Account object on success
login = function( self, username, password )
local status, msg
if ( self.invalid_users[username] ) then
return false, brute.Error:new( "User is invalid" )
end
status, msg = self.svn:login( username, password )
if ( not(status) and msg:match("Username not found") ) then
self.invalid_users[username] = true
return false, brute.Error:new("Username not found")
elseif ( status and msg:match("success") ) then
return true, creds.Account:new(username, password, creds.State.VALID)
else
return false, brute.Error:new( "Incorrect password" )
end
end,
--- Verifies whether the repository is valid
--
-- @return status, true on success, false on failure
-- @return err string containing an error message on failure
check = function( self )
local svn = svn:new( self.host, self.port, self.repo )
local status = svn:connect()
svn:close()
if ( status ) then
return true
else
return false, ("Failed to connect to SVN repository (%s)"):format(self.repo)
end
end,
}
action = function(host, port)
local status, accounts
local repo = stdnse.get_script_args('svn-brute.repo')
local force = stdnse.get_script_args('svn-brute.force')
if ( not(repo) ) then
return "No repository specified (see svn-brute.repo)"
end
local svn = svn:new( host, port, repo )
local status = svn:connect()
if ( status and svn.auth_mech["ANONYMOUS"] and not(force) ) then
return " \n Anonymous SVN detected, no authentication needed"
end
if ( not(svn.auth_mech) or not( svn.auth_mech["CRAM-MD5"] ) ) then
return " \n No supported authentication mechanisms detected"
end
local invalid_users = {}
local engine = brute.Engine:new(Driver, host, port, invalid_users)
engine.options.script_name = SCRIPT_NAME
status, accounts = engine:start()
if( not(status) ) then
return accounts
end
return accounts
end
|
