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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 table.concat(capstrings, " ")
elseif type(capa) == "string" then
stdnse.debug1("'%s' for %s", capa, host.ip)
return
else
return "server doesn't support CAPABILITIES"
end
end
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