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mod_register_dnsbl_warn/mod_register_dnsbl_warn.lua @ 4651:8231774f5bfd
mod_cloud_notify_encrypted: Ensure body substring remains valid UTF-8
The `body:sub()` call risks splitting the string in the middle of a
multi-byte UTF-8 sequence. This should have been caught by util.stanza
validation, but that would have caused some havoc, at the very least causing
the notification to not be sent.
There have been no reports of this happening. Likely because this module
isn't widely deployed among users with languages that use many longer UTF-8
sequences.
The util.encodings.utf8.valid() function is O(n) where only the last
sequence really needs to be checked, but it's in C and expected to be fast.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Sun, 22 Aug 2021 13:22:59 +0200 |
parent | 3993:76036fa34055 |
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local adns = require "net.adns"; local rbl = module:get_option_string("registration_rbl"); local function reverse(ip, suffix) if ip:sub(1,7):lower() == "::ffff:" then ip = ip:sub(8); end local a,b,c,d = ip:match("^(%d+).(%d+).(%d+).(%d+)$"); if not a then return end return ("%d.%d.%d.%d.%s"):format(d,c,b,a, suffix); end -- TODO async -- module:hook("user-registering", function (event) end); module:hook("user-registered", function (event) local session = event.session; local ip = session and session.ip; local rbl_ip = ip and reverse(ip, rbl); if rbl_ip then local log = session.log; adns.lookup(function (reply) if reply and reply[1] then log("warn", "Account %s@%s registered from IP %s found in RBL (%s)", event.username, event.host or module.host, ip, reply[1].a); end end, rbl_ip); end end);