File

core/certmanager.lua @ 5915:e6fed1d80116

Back out 1b0ac7950129, as SSLv3 appears to still be in moderate use on the network. Also, although obsolete, SSLv3 isn't documented to have any weaknesses that TLS 1.0 (the most common version used today) doesn't also have. Get your act together clients!
author Matthew Wild <mwild1@gmail.com>
date Tue, 12 Nov 2013 02:13:01 +0000
parent 5907:9586979058b8
child 5916:1c4405f33561
child 5921:f7601ce30cfc
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-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
-- 
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--

local configmanager = require "core.configmanager";
local log = require "util.logger".init("certmanager");
local ssl = ssl;
local ssl_newcontext = ssl and ssl.newcontext;

local tostring = tostring;
local type = type;
local io_open = io.open;

local prosody = prosody;
local resolve_path = configmanager.resolve_relative_path;
local config_path = prosody.paths.config;

local luasec_has_noticket, luasec_has_verifyext, luasec_has_no_compression;
if ssl then
	local luasec_major, luasec_minor = ssl._VERSION:match("^(%d+)%.(%d+)");
	luasec_has_noticket = tonumber(luasec_major)>0 or tonumber(luasec_minor)>=4;
	luasec_has_verifyext = tonumber(luasec_major)>0 or tonumber(luasec_minor)>=5;
	luasec_has_no_compression = tonumber(luasec_major)>0 or tonumber(luasec_minor)>=5;
end

module "certmanager"

-- Global SSL options if not overridden per-host
local default_ssl_config = configmanager.get("*", "ssl");
local default_capath = "/etc/ssl/certs";
local default_verify = (ssl and ssl.x509 and { "peer", "client_once", }) or "none";
local default_options = { "no_sslv2", "cipher_server_preference", luasec_has_noticket and "no_ticket" or nil };
local default_verifyext = { "lsec_continue", "lsec_ignore_purpose" };

if ssl and not luasec_has_verifyext and ssl.x509 then
	-- COMPAT mw/luasec-hg
	for i=1,#default_verifyext do -- Remove lsec_ prefix
		default_verify[#default_verify+1] = default_verifyext[i]:sub(6);
	end
end
if luasec_has_no_compression and configmanager.get("*", "ssl_compression") ~= true then
	default_options[#default_options+1] = "no_compression";
end

if luasec_has_no_compression then -- Has no_compression? Then it has these too...
	default_options[#default_options+1] = "single_dh_use";
	default_options[#default_options+1] = "single_ecdh_use";
end

function create_context(host, mode, user_ssl_config)
	user_ssl_config = user_ssl_config or default_ssl_config;

	if not ssl then return nil, "LuaSec (required for encryption) was not found"; end
	if not user_ssl_config then return nil, "No SSL/TLS configuration present for "..host; end
	
	local ssl_config = {
		mode = mode;
		protocol = user_ssl_config.protocol or "sslv23";
		key = resolve_path(config_path, user_ssl_config.key);
		password = user_ssl_config.password or function() log("error", "Encrypted certificate for %s requires 'ssl' 'password' to be set in config", host); end;
		certificate = resolve_path(config_path, user_ssl_config.certificate);
		capath = resolve_path(config_path, user_ssl_config.capath or default_capath);
		cafile = resolve_path(config_path, user_ssl_config.cafile);
		verify = user_ssl_config.verify or default_verify;
		verifyext = user_ssl_config.verifyext or default_verifyext;
		options = user_ssl_config.options or default_options;
		depth = user_ssl_config.depth;
		curve = user_ssl_config.curve or "secp384r1";
		ciphers = user_ssl_config.ciphers or "HIGH+kEDH:HIGH+kEECDH:HIGH+kRSA:!DSS:!3DES:!aNULL";
		dhparam = user_ssl_config.dhparam;
	};

	-- LuaSec expects dhparam to be a callback that takes two arguments.
	-- We ignore those because it is mostly used for having a separate
	-- set of params for EXPORT ciphers, which we don't have by default.
	if type(ssl_config.dhparam) == "string" then
		local f, err = io_open(resolve_path(config_path, ssl_config.dhparam));
		if not f then return nil, "Could not open DH parameters: "..err end
		local dhparam = f:read("*a");
		f:close();
		ssl_config.dhparam = function() return dhparam; end
	end

	local ctx, err = ssl_newcontext(ssl_config);

	-- COMPAT: LuaSec 0.4.1 ignores the cipher list from the config, so we have to take
	-- care of it ourselves...
	if ctx and ssl_config.ciphers then
		local success;
		success, err = ssl.context.setcipher(ctx, ssl_config.ciphers);
		if not success then ctx = nil; end
	end

	if not ctx then
		err = err or "invalid ssl config"
		local file = err:match("^error loading (.-) %(");
		if file then
			if file == "private key" then
				file = ssl_config.key or "your private key";
			elseif file == "certificate" then
				file = ssl_config.certificate or "your certificate file";
			end
			local reason = err:match("%((.+)%)$") or "some reason";
			if reason == "Permission denied" then
				reason = "Check that the permissions allow Prosody to read this file.";
			elseif reason == "No such file or directory" then
				reason = "Check that the path is correct, and the file exists.";
			elseif reason == "system lib" then
				reason = "Previous error (see logs), or other system error.";
			elseif reason == "(null)" or not reason then
				reason = "Check that the file exists and the permissions are correct";
			else
				reason = "Reason: "..tostring(reason):lower();
			end
			log("error", "SSL/TLS: Failed to load '%s': %s (for %s)", file, reason, host);
		else
			log("error", "SSL/TLS: Error initialising for %s: %s", host, err);
		end
	end
	return ctx, err;
end

function reload_ssl_config()
	default_ssl_config = configmanager.get("*", "ssl");
end

prosody.events.add_handler("config-reloaded", reload_ssl_config);

return _M;