Mercurial > prosody-modules
view mod_s2s_auth_fingerprint/mod_s2s_auth_fingerprint.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 | ee2cedb0f691 |
children |
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-- Copyright (C) 2013-2014 Kim Alvefur -- This file is MIT/X11 licensed. module:set_global(); local digest_algo = module:get_option_string(module:get_name().."_digest", "sha1"); local fingerprints = {}; local function hashprep(h) return tostring(h):gsub(":",""):lower(); end local function hashfmt(h) return h:gsub("..","%0:", #h/2-1):upper(); end for host, set in pairs(module:get_option("s2s_trusted_fingerprints", {})) do local host_set = {} if type(set) == "table" then -- list of fingerprints for i=1,#set do host_set[hashprep(set[i])] = true; end else -- assume single fingerprint host_set[hashprep(set)] = true; end fingerprints[host] = host_set; end module:hook("s2s-check-certificate", function(event) local session, host, cert = event.session, event.host, event.cert; local host_fingerprints = fingerprints[host]; if host_fingerprints then local digest = cert and cert:digest(digest_algo); if host_fingerprints[digest] then module:log("info", "'%s' matched %s fingerprint %s", host, digest_algo:upper(), hashfmt(digest)); session.cert_chain_status = "valid"; session.cert_identity_status = "valid"; return true; else module:log("warn", "'%s' has unknown %s fingerprint %s", host, digest_algo:upper(), hashfmt(digest)); session.cert_chain_status = "invalid"; session.cert_identity_status = "invalid"; end end end);