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