local imap = require "imap" local shortport = require "shortport" local stdnse = require "stdnse" local table = require "table" description = [[ Retrieves IMAP email server capabilities. IMAP4rev1 capabilities are defined in RFC 3501. The CAPABILITY command allows a client to ask a server what commands it supports and possibly any site-specific policy. ]] --- -- @output -- 143/tcp open imap -- |_ imap-capabilities: LOGINDISABLED IDLE IMAP4 LITERAL+ STARTTLS NAMESPACE IMAP4rev1 author = "Brandon Enright" license = "Same as Nmap--See https://nmap.org/book/man-legal.html" categories = {"default", "safe"} portrule = shortport.port_or_service({143, 993}, {"imap", "imaps"}) local function fail (err) return stdnse.format_output(false, err) end action = function(host, port) local helper = imap.Helper:new(host, port) local status = helper:connect() if ( not(status) ) then return fail("Failed to connect to server") end local status, capa = helper:capabilities(host, port) if( not(status) ) then return fail("Failed to retrieve capabilities") end helper:close() if type(capa) == "table" then -- Convert the capabilities table into an array of strings. local capstrings = {} local cap, args for cap, args in pairs(capa) do table.insert(capstrings, cap) end return stdnse.strjoin(" ", capstrings) elseif type(capa) == "string" then stdnse.debug1("'%s' for %s", capa, host.ip) return else return "server doesn't support CAPABILITIES" end end