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mod_saslauth, mod_c2s: Disable tls-server-end-point channel binding by default This channel binding method is now enabled when a hash is manually set in the config, or it attempts to discover the hash automatically if the value is the special string "auto". A related change to mod_c2s prevents complicated certificate lookups in the client connection hot path - this work now happens only when this channel binding method is used. I'm not aware of anything else that uses ssl_cfg (vs ssl_ctx). Rationale for disabling by default: - Minor performance impact in automatic cert detection - This method is weak against a leaked/stolen private key (other methods such as 'tls-exporter' would not be compromised in such a case) Rationale for keeping the implementation: - For some deployments, this may be the only method available (e.g. due to TLS offloading in another process/server).

#!/usr/bin/env lua
-- traceback to errors.err for vim -q
-- e.g. curl https://prosody.im/paste/xxx | tb2err > errors.err && vim -q

local path_sep = package.config:sub(1,1);
for line in io.lines() do
	local src, err = line:match("%s*(%S+)(:%d+: .*)")
	if src then
		src = src:gsub("\\", path_sep);
		local cut = src:match("/()core/")
			or src:match("/()net/")
			or src:match("/()util/")
			or src:match("/()modules/")
			or src:match("/()prosody%-modules/")
			or src:match("/()plugins/")
			or src:match("/()prosody[ctl]*$")
		if cut then
			src = src:sub(cut);
		end
		src = src:gsub("prosody%-modules/", "../modules/")
		src = src:gsub("^modules/", "plugins/")
		io.write(src, err, "\n");
	end
end