File

mod_http_oauth2: Advertise the currently supported id_token signing algorithm This field is REQUIRED. The algorithm RS256 MUST be included, but isn't because we don't implement it, as that would require implementing a pile of additional cryptography and JWT stuff. Instead the id_token is signed using the client secret, which allows verification by the client, since it's a shared secret per OpenID Connect Core 1.0 § 10.1 under Symmetric Signatures. OpenID Connect Discovery 1.0 has a lot of REQUIRED and MUST clauses that are not supported here, but that's okay because this is served from the RFC 8414 OAuth 2.0 Authorization Server Metadata .well-known endpoint!

local st = require "util.stanza";

local blacklist = module:get_option_inherited_set("s2s_blacklist", {});

module:hook("route/remote", function (event)
	if blacklist:contains(event.to_host) then
		if event.stanza.attr.type ~= "error" then
			module:send(st.error_reply(event.stanza, "cancel", "not-allowed", "Communication with this domain is restricted"));
		end
		return true;
	end
end, 100);

module:hook("s2s-stream-features", function (event)
	if blacklist:contains(event.origin.from_host) then
		event.origin:close({
			condition = "policy-violation";
			text = "Communication with this domain is restricted";
		});
	end
end, 1000);