# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1732455779 -3600
# Node ID c7c17fac41b3a285bf069297f7cfbb80191d19bc
# Parent  25b091cbb471cfe40d82d5fc7fb8dfc120dc41ab
mod_sasl2_fast: Only copy SASL handler internals from util.sasl instance

Prevents traceback in case the session sasl handler is missing the
profile table, as may be the case with non-core sasl handlers.

Thanks taba for reporting

diff -r 25b091cbb471 -r c7c17fac41b3 mod_sasl2_fast/mod_sasl2_fast.lua
--- a/mod_sasl2_fast/mod_sasl2_fast.lua	Fri Nov 22 19:09:10 2024 +0000
+++ b/mod_sasl2_fast/mod_sasl2_fast.lua	Sun Nov 24 14:42:59 2024 +0100
@@ -8,6 +8,11 @@
 local now = require "util.time".now;
 local hash = require "util.hashes";
 
+local sasl_mt = getmetatable(sasl.new("", { mechanisms = {} }));
+local function is_util_sasl(sasl_handler)
+	return getmetatable(sasl_handler) == sasl_mt;
+end
+
 module:depends("sasl2");
 
 -- Tokens expire after 21 days by default
@@ -113,9 +118,11 @@
 	local sasl_handler = get_sasl_handler(username);
 	if not sasl_handler then return; end
 	sasl_handler.fast_auth = true; -- For informational purposes
-	-- Copy channel binding info from primary SASL handler
-	sasl_handler.profile.cb = session.sasl_handler.profile.cb;
-	sasl_handler.userdata = session.sasl_handler.userdata;
+	-- Copy channel binding info from primary SASL handler if it's compatible
+	if is_util_sasl(session.sasl_handler) then
+		sasl_handler.profile.cb = session.sasl_handler.profile.cb;
+		sasl_handler.userdata = session.sasl_handler.userdata;
+	end
 	-- Store this handler, in case we later want to use it for authenticating
 	session.fast_sasl_handler = sasl_handler;
 	local fast = st.stanza("fast", { xmlns = xmlns_fast });