EVOLUTION-MANAGER

Edit File: ssh2-enum-algos.nse

local nmap = require "nmap" local shortport = require "shortport" local stdnse = require "stdnse" local table = require "table" local openssl = stdnse.silent_require "openssl" local ssh2 = stdnse.silent_require "ssh2" description = [[ Reports the number of algorithms (for encryption, compression, etc.) that the target SSH2 server offers. If verbosity is set, the offered algorithms are each listed by type. If the "client to server" and "server to client" algorithm lists are identical (order specifies preference) then the list is shown only once under a combined type. ]] --- -- @usage -- nmap --script ssh2-enum-algos target -- -- @output -- PORT STATE SERVICE -- 22/tcp open ssh -- | ssh2-enum-algos: -- | kex_algorithms (4) -- | diffie-hellman-group-exchange-sha256 -- | diffie-hellman-group-exchange-sha1 -- | diffie-hellman-group14-sha1 -- | diffie-hellman-group1-sha1 -- | server_host_key_algorithms (2) -- | ssh-rsa -- | ssh-dss -- | encryption_algorithms (13) -- | aes128-ctr -- | aes192-ctr -- | aes256-ctr -- | arcfour256 -- | arcfour128 -- | aes128-cbc -- | 3des-cbc -- | blowfish-cbc -- | cast128-cbc -- | aes192-cbc -- | aes256-cbc -- | arcfour -- | rijndael-cbc@lysator.liu.se -- | mac_algorithms (6) -- | hmac-md5 -- | hmac-sha1 -- | hmac-ripemd160 -- | hmac-ripemd160@openssh.com -- | hmac-sha1-96 -- | hmac-md5-96 -- | compression_algorithms (2) -- | none -- |_ zlib@openssh.com author = "Kris Katterjohn" license = "Same as Nmap--See http://nmap.org/book/man-legal.html" categories = {"safe", "discovery"} portrule = shortport.port_or_service(22, "ssh") -- Build onto lists{} and possibly modify parsed{} based on whether the -- algorithm name-lists are identical between the server-to-client and -- client-to-server types. Note that this simply modifies the passed tables. local combine_types = function(parsed, lists) local doubles = { "encryption_algorithms", "mac_algorithms", "compression_algorithms" } for _, i in ipairs(doubles) do local c2s = i .. "_client_to_server" local s2c = i .. "_server_to_client" if parsed[c2s] == parsed[s2c] then parsed[i] = parsed[c2s] parsed[c2s] = nil parsed[s2c] = nil table.insert(lists, i) else table.insert(lists, c2s) table.insert(lists, s2c) end end end -- Build and return the output table local output = function(parsed, lists) local out = {} for _, l in ipairs(lists) do local v = parsed[l] local a = v:len() > 0 and stdnse.strsplit(",", v) or {} local e if nmap.verbosity() > 0 then e = { ["name"] = l .. " (" .. #a .. ")" } table.insert(e, a) else e = l .. " (" .. #a .. ")" end table.insert(out, e) end return stdnse.format_output(true, out) end action = function(host, port) local sock = nmap.new_socket() local status = sock:connect(host, port) if not status then return end status = sock:receive_lines(1) if not status then sock:close() return end status = sock:send("SSH-2.0-Nmap-SSH2-Enum-Algos\r\n") if not status then sock:close() return end local ssh = ssh2.transport -- I would think that the server would send its kex data right after -- receiving and verifying our protocol id string above, then we could -- just use it here, but I've seen no definitive documentation saying -- that we don't ever send ours first. All I've seen is that if the -- server doesn't care about compatibility with older clients then it -- MAY send its kex data after the protocol id string. So I guess I'll -- send it here until I know for sure (removing this send works against -- OpenSSH though). local pkt = ssh.build(ssh.kex_init()) status = sock:send(pkt) if not status then sock:close() return end local status, response = ssh.receive_packet(sock) sock:close() if not status then return end local parsed = ssh.parse_kex_init(ssh.payload(response)) local lists = { "kex_algorithms", "server_host_key_algorithms" -- Other types will be added below in combine_types() } -- Modifies tables combine_types(parsed, lists) return output(parsed, lists) end