File

core/portmanager.lua @ 10721:3a1b1d3084fb 0.11

core.certmanager: Move EECDH ciphers before EDH in default cipherstring (fixes #1513) Backport of 94e341dee51c The original intent of having kEDH before kEECDH was that if a `dhparam` file was specified, this would be interpreted as a preference by the admin for old and well-tested Diffie-Hellman key agreement over newer elliptic curve ones. Otherwise the faster elliptic curve ciphersuites would be preferred. This didn't really work as intended since this affects the ClientHello on outgoing s2s connections, leading to some servers using poorly configured kEDH. With Debian shipping OpenSSL settings that enforce a higher security level, this caused interoperability problems with servers that use DH params smaller than 2048 bits. E.g. jabber.org at the time of this writing has 1024 bit DH params. MattJ says > Curves have won, and OpenSSL is less weird about them now
author Kim Alvefur <zash@zash.se>
date Sun, 25 Aug 2019 20:22:35 +0200
parent 9972:240d3f1f7dee
child 9975:ca01c449357f
line wrap: on
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local config = require "core.configmanager";
local certmanager = require "core.certmanager";
local server = require "net.server";
local socket = require "socket";

local log = require "util.logger".init("portmanager");
local multitable = require "util.multitable";
local set = require "util.set";

local table = table;
local setmetatable, rawset, rawget = setmetatable, rawset, rawget;
local type, tonumber, tostring, ipairs = type, tonumber, tostring, ipairs;

local prosody = prosody;
local fire_event = prosody.events.fire_event;

local _ENV = nil;
-- luacheck: std none

--- Config

local default_interfaces = { };
local default_local_interfaces = { };
if config.get("*", "use_ipv4") ~= false then
	table.insert(default_interfaces, "*");
	table.insert(default_local_interfaces, "127.0.0.1");
end
if socket.tcp6 and config.get("*", "use_ipv6") ~= false then
	table.insert(default_interfaces, "::");
	table.insert(default_local_interfaces, "::1");
end

local default_mode = config.get("*", "network_default_read_size") or 4096;

--- Private state

-- service_name -> { service_info, ... }
local services = setmetatable({}, { __index = function (t, k) rawset(t, k, {}); return rawget(t, k); end });

-- service_name, interface (string), port (number)
local active_services = multitable.new();

--- Private helpers

local function error_to_friendly_message(service_name, port, err) --luacheck: ignore 212/service_name
	local friendly_message = err;
	if err:match(" in use") then
		-- FIXME: Use service_name here
		if port == 5222 or port == 5223 or port == 5269 then
			friendly_message = "check that Prosody or another XMPP server is "
				.."not already running and using this port";
		elseif port == 80 or port == 81 then
			friendly_message = "check that a HTTP server is not already using "
				.."this port";
		elseif port == 5280 then
			friendly_message = "check that Prosody or a BOSH connection manager "
				.."is not already running";
		else
			friendly_message = "this port is in use by another application";
		end
	elseif err:match("permission") then
		friendly_message = "Prosody does not have sufficient privileges to use this port";
	end
	return friendly_message;
end

--- Public API

local function activate(service_name)
	local service_info = services[service_name][1];
	if not service_info then
		return nil, "Unknown service: "..service_name;
	end

	local listener = service_info.listener;

	local config_prefix = (service_info.config_prefix or service_name).."_";
	if config_prefix == "_" then
		config_prefix = "";
	end

	local bind_interfaces = config.get("*", config_prefix.."interfaces")
		or config.get("*", config_prefix.."interface") -- COMPAT w/pre-0.9
		or (service_info.private and (config.get("*", "local_interfaces") or default_local_interfaces))
		or config.get("*", "interfaces")
		or config.get("*", "interface") -- COMPAT w/pre-0.9
		or listener.default_interface -- COMPAT w/pre0.9
		or default_interfaces
	bind_interfaces = set.new(type(bind_interfaces)~="table" and {bind_interfaces} or bind_interfaces);

	local bind_ports = config.get("*", config_prefix.."ports")
		or service_info.default_ports
		or {service_info.default_port
		    or listener.default_port -- COMPAT w/pre-0.9
		   }
	bind_ports = set.new(type(bind_ports) ~= "table" and { bind_ports } or bind_ports );

	local mode, ssl = listener.default_mode or default_mode;
	local hooked_ports = {};

	for interface in bind_interfaces do
		for port in bind_ports do
			local port_number = tonumber(port);
			if not port_number then
				log("error", "Invalid port number specified for service '%s': %s", service_info.name, tostring(port));
			elseif #active_services:search(nil, interface, port_number) > 0 then
				log("error", "Multiple services configured to listen on the same port ([%s]:%d): %s, %s", interface, port,
					active_services:search(nil, interface, port)[1][1].service.name or "<unnamed>", service_name or "<unnamed>");
			else
				local err;
				-- Create SSL context for this service/port
				if service_info.encryption == "ssl" then
					local global_ssl_config = config.get("*", "ssl") or {};
					local prefix_ssl_config = config.get("*", config_prefix.."ssl") or global_ssl_config;
					log("debug", "Creating context for direct TLS service %s on port %d", service_info.name, port);
					ssl, err = certmanager.create_context(service_info.name.." port "..port, "server",
						prefix_ssl_config[interface],
						prefix_ssl_config[port],
						prefix_ssl_config,
						service_info.ssl_config or {},
						global_ssl_config[interface],
						global_ssl_config[port]);
					if not ssl then
						log("error", "Error binding encrypted port for %s: %s", service_info.name,
							error_to_friendly_message(service_name, port_number, err) or "unknown error");
					end
				end
				if not err then
					-- Start listening on interface+port
					local handler, err = server.addserver(interface, port_number, listener, mode, ssl);
					if not handler then
						log("error", "Failed to open server port %d on %s, %s", port_number, interface,
							error_to_friendly_message(service_name, port_number, err));
					else
						table.insert(hooked_ports, "["..interface.."]:"..port_number);
						log("debug", "Added listening service %s to [%s]:%d", service_name, interface, port_number);
						active_services:add(service_name, interface, port_number, {
							server = handler;
							service = service_info;
						});
					end
				end
			end
		end
	end
	log("info", "Activated service '%s' on %s", service_name,
		#hooked_ports == 0 and "no ports" or table.concat(hooked_ports, ", "));
	return true;
end

local close; -- forward declaration

local function deactivate(service_name, service_info)
	for name, interface, port, n, active_service --luacheck: ignore 213/name 213/n
		in active_services:iter(service_name or service_info and service_info.name, nil, nil, nil) do
		if service_info == nil or active_service.service == service_info then
			close(interface, port);
		end
	end
	log("info", "Deactivated service '%s'", service_name or service_info.name);
end

local function register_service(service_name, service_info)
	table.insert(services[service_name], service_info);

	if not active_services:get(service_name) then
		log("debug", "No active service for %s, activating...", service_name);
		local ok, err = activate(service_name);
		if not ok then
			log("error", "Failed to activate service '%s': %s", service_name, err or "unknown error");
		end
	end

	fire_event("service-added", { name = service_name, service = service_info });
	return true;
end

local function unregister_service(service_name, service_info)
	log("debug", "Unregistering service: %s", service_name);
	local service_info_list = services[service_name];
	for i, service in ipairs(service_info_list) do
		if service == service_info then
			table.remove(service_info_list, i);
		end
	end
	deactivate(nil, service_info);
	if #service_info_list > 0 then -- Other services registered with this name
		activate(service_name); -- Re-activate with the next available one
	end
	fire_event("service-removed", { name = service_name, service = service_info });
end

local get_service_at -- forward declaration

function close(interface, port)
	local service, service_server = get_service_at(interface, port);
	if not service then
		return false, "port-not-open";
	end
	service_server:close();
	active_services:remove(service.name, interface, port);
	log("debug", "Removed listening service %s from [%s]:%d", service.name, interface, port);
	return true;
end

function get_service_at(interface, port)
	local data = active_services:search(nil, interface, port)[1][1];
	return data.service, data.server;
end

local function get_service(service_name)
	return (services[service_name] or {})[1];
end

local function get_active_services()
	return active_services;
end

local function get_registered_services()
	return services;
end

-- Event handlers

prosody.events.add_handler("item-added/net-provider", function (event)
	local item = event.item;
	register_service(item.name, item);
end);
prosody.events.add_handler("item-removed/net-provider", function (event)
	local item = event.item;
	unregister_service(item.name, item);
end);

return {
	activate = activate;
	deactivate = deactivate;
	register_service = register_service;
	unregister_service = unregister_service;
	close = close;
	get_service_at = get_service_at;
	get_service = get_service;
	get_active_services = get_active_services;
	get_registered_services = get_registered_services;
};