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NSE: Add STARTTLS Support to SSLv2.nse #320

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NSE: Add STARTTLS Support to SSLv2.nse #320

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28 changes: 25 additions & 3 deletions scripts/sslv2.nse
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ local string = require "string"
local table = require "table"
local bin = require "bin"
local stdnse = require "stdnse"
local sslcert = require "sslcert"

description = [[
Determines whether the server supports obsolete and less secure SSLv2, and discovers which ciphers it
Expand Down Expand Up @@ -42,7 +43,9 @@ license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"default", "safe"}


portrule = shortport.ssl
portrule = function(host, port)
return shortport.ssl(host, port) or sslcert.getPrepareTLSWithoutReconnect(port)
end

local ssl_ciphers = {
-- (cut down) table of codes with their corresponding ciphers.
Expand Down Expand Up @@ -80,8 +83,28 @@ local ciphers = function(cipher_list)
end

action = function(host, port)
local timeout = stdnse.get_timeout(host, 10000, 5000)

-- Create socket.
local status, sock, err
local starttls = sslcert.getPrepareTLSWithoutReconnect(port)
if starttls then
status, socket = starttls(host, port)
if not status then
stdnse.debug(1, "Can't connect using STARTTLS: %s", socket)
return nil
end
else
socket = nmap.new_socket()
socket:set_timeout(timeout)
status, err = socket:connect(host, port)
if not status then
stdnse.debug(1, "Can't connect: %s", err)
return nil
end
end

local socket = nmap.new_socket();
socket:set_timeout(timeout)

-- build client hello packet (contents inspired by
-- http://mail.nessus.org/pipermail/plugins-writers/2004-October/msg00041.html )
Expand All @@ -101,7 +124,6 @@ action = function(host, port)
.. "\x02\x00\x80" -- SSL2_RC4_128_EXPORT40_WITH_MD5
.. "\xe4\xbd\x00\x00\xa4\x41\xb6\x74\x71\x2b\x27\x95\x44\xc0\x3d\xc0" -- challenge

socket:connect(host, port);
socket:send(ssl_v2_hello);

local status, server_hello = socket:receive_bytes(2);
Expand Down