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local nmap = require "nmap"
local shortport = require "shortport"
local string = require "string"
description = [[
Checks if an SSH server supports the obsolete and less secure SSH Protocol Version 1.
]]
author = "Brandon Enright"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"default", "safe"}
---
-- @output
-- PORT STATE SERVICE
-- 22/tcp open ssh
-- |_sshv1: Server supports SSHv1
portrule = shortport.port_or_service(22, "ssh")
action = function(host, port)
local socket = nmap.new_socket()
local result;
local status = true;
socket:connect(host, port)
status, result = socket:receive_lines(1);
if (not status) then
socket:close()
return
end
if (result == "TIMEOUT") then
socket:close()
return
end
if not string.match(result, "^SSH%-.+\n$") then
socket:close()
return
end
socket:send("SSH-1.5-NmapNSE_1.0\n")
-- should be able to consume at least 13 bytes
-- key length is a 4 byte integer
-- padding is between 1 and 8 bytes
-- type is one byte
-- key is at least several bytes
status, result = socket:receive_bytes(13);
if (not status) then
socket:close()
return
end
if (result == "TIMEOUT") then
socket:close()
return
end
if not string.match(result, "^....[\0]+\002") then
socket:close()
return
end
socket:close();
return "Server supports SSHv1"
end