Mercurial > prosody-modules
view mod_ipcheck/mod_ipcheck.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 |
parents | b0628bc93acf |
children |
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-- mod_ipcheck.lua -- Implementation of XEP-0279: Server IP Check <http://xmpp.org/extensions/xep-0279.html> local st = require "util.stanza"; module:add_feature("urn:xmpp:sic:0"); module:hook("iq-get/bare/urn:xmpp:sic:0:ip", function(event) local origin, stanza = event.origin, event.stanza; if stanza.attr.to then origin.send(st.error_reply(stanza, "auth", "forbidden", "You can only ask about your own IP address")); elseif origin.ip then origin.send(st.reply(stanza):tag("ip", {xmlns='urn:xmpp:sic:0'}):text(origin.ip)); else -- IP addresses should normally be available, but in case they are not origin.send(st.error_reply(stanza, "cancel", "service-unavailable", "IP address for this session is not available")); end return true; end); module:add_feature("urn:xmpp:sic:1"); module:hook("iq-get/bare/urn:xmpp:sic:1:address", function(event) local origin, stanza = event.origin, event.stanza; if stanza.attr.to then origin.send(st.error_reply(stanza, "auth", "forbidden", "You can only ask about your own IP address")); elseif origin.ip then local reply = st.reply(stanza):tag("address", {xmlns='urn:xmpp:sic:1'}) :tag("ip"):text(origin.ip):up() if origin.conn and origin.conn.port then -- server_event reply:tag("port"):text(tostring(origin.conn:port())) elseif origin.conn and origin.conn.clientport then -- server_select reply:tag("port"):text(tostring(origin.conn:clientport())) end origin.send(reply); else -- IP addresses should normally be available, but in case they are not origin.send(st.error_reply(stanza, "cancel", "service-unavailable", "IP address for this session is not available")); end return true; end);