Software / code / prosody
Diff
plugins/mod_saslauth.lua @ 12594:29685403be32
mod_saslauth: Implement RFC 9266 'tls-exporter' channel binding (#1760)
Brings back SCRAM-SHA-*-PLUS from its hiatus brought on by the earlier
channel binding method being undefined for TLS 1.3, and the increasing
deployment of TLS 1.3.
See 1bfd238e05ad and #1542
Requires future version of LuaSec, once support for this key material
export method is merged.
See https://github.com/brunoos/luasec/pull/187
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Wed, 01 Jun 2022 15:06:59 +0200 |
| parent | 12541:97af41d580f7 |
| child | 12641:e9865b0cfb89 |
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--- a/plugins/mod_saslauth.lua Mon Jul 11 20:02:10 2022 +0200 +++ b/plugins/mod_saslauth.lua Wed Jun 01 15:06:59 2022 +0200 @@ -245,6 +245,15 @@ return self.userdata["tls-unique"]:ssl_peerfinished(); end +local function tls_exporter(conn) + if not conn.ssl_exportkeyingmaterial then return end + return conn:ssl_exportkeyingmaterial("EXPORTER-Channel-Binding", 32, ""); +end + +local function sasl_tls_exporter(self) + return tls_exporter(self.userdata["tls-exporter"]); +end + local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' }; local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' }; local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' }; @@ -266,6 +275,11 @@ local info = origin.conn:ssl_info(); if info and info.protocol == "TLSv1.3" then log("debug", "Channel binding 'tls-unique' undefined in context of TLS 1.3"); + if tls_exporter(origin.conn) then + log("debug", "Channel binding 'tls-exporter' supported"); + sasl_handler:add_cb_handler("tls-exporter", sasl_tls_exporter); + channel_bindings:add("tls-exporter"); + end elseif origin.conn.ssl_peerfinished and origin.conn:ssl_peerfinished() then log("debug", "Channel binding 'tls-unique' supported"); sasl_handler:add_cb_handler("tls-unique", tls_unique); @@ -275,6 +289,7 @@ end sasl_handler["userdata"] = { ["tls-unique"] = origin.conn; + ["tls-exporter"] = origin.conn; }; else log("debug", "Channel binding not supported by SASL handler");
