Mercurial > prosody-modules
annotate mod_deny_omemo/mod_deny_omemo.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 | 2ad35f08bd57 |
children |
rev | line source |
---|---|
3053
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
1 local st = require "util.stanza"; |
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
2 |
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
3 local omemo_namespace_prefix = "eu.siacs.conversations.axolotl." |
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
4 |
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
5 module:hook("iq/bare/http://jabber.org/protocol/pubsub:pubsub", function (event) |
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
6 local origin, stanza = event.origin, event.stanza; |
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
7 |
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
8 local node = stanza.tags[1].tags[1].attr.node; |
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
9 if node and node:sub(1, #omemo_namespace_prefix) == omemo_namespace_prefix then |
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
10 origin.send(st.error_reply(stanza, "cancel", "item-not-found", "OMEMO is disabled")); |
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
11 return true; |
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
12 end |
2ad35f08bd57
mod_deny_omemo: Prevents publishing and retreival of OMEMO PEP nodes
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
13 end, 10); |