1 files changed, 191 insertions, 64 deletions

diff --git a/core/certmanager.lua b/core/certmanager.lua
index 624bd841..f343b6d7 100644
--- a/core/certmanager.lua
+++ b/core/certmanager.lua
@@ -1,97 +1,211 @@
 -- 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 softreq = require"util.dependencies".softreq;
+local ssl = softreq"ssl";
+if not ssl then
+	return {
+		create_context = function ()
+			return nil, "LuaSec (required for encryption) was not found";
+		end;
+		reload_ssl_config = function () end;
+	}
+end
+
 local configmanager = require "core.configmanager";
 local log = require "util.logger".init("certmanager");
-local ssl = ssl;
-local ssl_newcontext = ssl and ssl.newcontext;
+local ssl_context = ssl.context or softreq"ssl.context";
+local ssl_x509 = ssl.x509 or softreq"ssl.x509";
+local ssl_newcontext = ssl.newcontext;
+local new_config = require"util.sslconfig".new;
+local stat = require "lfs".attributes;
 
-local tostring = tostring;
+local tonumber, tostring = tonumber, tostring;
+local pairs = pairs;
+local t_remove = table.remove;
 local type = type;
 local io_open = io.open;
+local select = select;
 
 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
+local resolve_path = require"util.paths".resolve_relative_path;
+local config_path = prosody.paths.config or ".";
+
+local luasec_major, luasec_minor = ssl._VERSION:match("^(%d+)%.(%d+)");
+local luasec_version = tonumber(luasec_major) * 100 + tonumber(luasec_minor);
+local luasec_has = softreq"ssl.config" or {
+	algorithms = {
+		ec = luasec_version >= 5;
+	};
+	capabilities = {
+		curves_list = luasec_version >= 7;
+	};
+	options = {
+		cipher_server_preference = luasec_version >= 2;
+		no_ticket = luasec_version >= 4;
+		no_compression = luasec_version >= 5;
+		single_dh_use = luasec_version >= 2;
+		single_ecdh_use = luasec_version >= 2;
+	};
+};
 
-module "certmanager"
+local _ENV = nil;
 
 -- 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", "no_sslv3", "cipher_server_preference", luasec_has_noticket and "no_ticket" or nil };
-local default_verifyext = { "lsec_continue", "lsec_ignore_purpose" };
+local global_ssl_config = configmanager.get("*", "ssl");
 
-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);
+local global_certificates = configmanager.get("*", "certificates") or "certs";
+
+local crt_try = { "", "/%s.crt", "/%s/fullchain.pem", "/%s.pem", };
+local key_try = { "", "/%s.key", "/%s/privkey.pem",   "/%s.pem", };
+
+local function find_cert(user_certs, name)
+	local certs = resolve_path(config_path, user_certs or global_certificates);
+	log("debug", "Searching %s for a key and certificate for %s...", certs, name);
+	for i = 1, #crt_try do
+		local crt_path = certs .. crt_try[i]:format(name);
+		local key_path = certs .. key_try[i]:format(name);
+
+		if stat(crt_path, "mode") == "file" then
+			if key_path:sub(-4) == ".crt" then
+				key_path = key_path:sub(1, -4) .. "key";
+				if stat(key_path, "mode") == "file" then
+					log("debug", "Selecting certificate %s with key %s for %s", crt_path, key_path, name);
+					return { certificate = crt_path, key = key_path };
+				end
+			elseif stat(key_path, "mode") == "file" then
+				log("debug", "Selecting certificate %s with key %s for %s", crt_path, key_path, name);
+				return { certificate = crt_path, key = key_path };
+			end
+		end
 	end
+	log("debug", "No certificate/key found for %s", name);
 end
-if luasec_has_no_compression and configmanager.get("*", "ssl_compression") ~= true then
-	default_options[#default_options+1] = "no_compression";
+
+local function find_host_cert(host)
+	if not host then return nil; end
+	return find_cert(configmanager.get(host, "certificate"), host) or find_host_cert(host:match("%.(.+)$"));
 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";
+local function find_service_cert(service, port)
+	local cert_config = configmanager.get("*", service.."_certificate");
+	if type(cert_config) == "table" then
+		cert_config = cert_config[port] or cert_config.default;
+	end
+	return find_cert(cert_config, service);
 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:!PSK:!SRP:!3DES:!aNULL";
-		dhparam = user_ssl_config.dhparam;
+-- Built-in defaults
+local core_defaults = {
+	capath = "/etc/ssl/certs";
+	depth = 9;
+	protocol = "tlsv1+";
+	verify = (ssl_x509 and { "peer", "client_once", }) or "none";
+	options = {
+		cipher_server_preference = luasec_has.options.cipher_server_preference;
+		no_ticket = luasec_has.options.no_ticket;
+		no_compression = luasec_has.options.no_compression and configmanager.get("*", "ssl_compression") ~= true;
+		single_dh_use = luasec_has.options.single_dh_use;
+		single_ecdh_use = luasec_has.options.single_ecdh_use;
+	};
+	verifyext = { "lsec_continue", "lsec_ignore_purpose" };
+	curve = luasec_has.algorithms.ec and not luasec_has.capabilities.curves_list and "secp384r1";
+	curveslist = {
+		"X25519",
+		"P-384",
+		"P-256",
+		"P-521",
 	};
+	ciphers = {      -- Enabled ciphers in order of preference:
+		"HIGH+kEDH",   -- Ephemeral Diffie-Hellman key exchange, if a 'dhparam' file is set
+		"HIGH+kEECDH", -- Ephemeral Elliptic curve Diffie-Hellman key exchange
+		"HIGH",        -- Other "High strength" ciphers
+		               -- Disabled cipher suites:
+		"!PSK",        -- Pre-Shared Key - not used for XMPP
+		"!SRP",        -- Secure Remote Password - not used for XMPP
+		"!3DES",       -- 3DES - slow and of questionable security
+		"!aNULL",      -- Ciphers that does not authenticate the connection
+	};
+}
+
+if luasec_has.curves then
+	for i = #core_defaults.curveslist, 1, -1 do
+		if not luasec_has.curves[ core_defaults.curveslist[i] ] then
+			t_remove(core_defaults.curveslist, i);
+		end
+	end
+else
+	core_defaults.curveslist = nil;
+end
+
+local path_options = { -- These we pass through resolve_path()
+	key = true, certificate = true, cafile = true, capath = true, dhparam = true
+}
+
+if luasec_version < 5 and ssl_x509 then
+	-- COMPAT mw/luasec-hg
+	for i=1,#core_defaults.verifyext do -- Remove lsec_ prefix
+		core_defaults.verify[#core_defaults.verify+1] = core_defaults.verifyext[i]:sub(6);
+	end
+end
+
+local function create_context(host, mode, ...)
+	local cfg = new_config();
+	cfg:apply(core_defaults);
+	local service_name, port = host:match("^(%w+) port (%d+)$");
+	if service_name then
+		cfg:apply(find_service_cert(service_name, tonumber(port)));
+	else
+		cfg:apply(find_host_cert(host));
+	end
+	cfg:apply({
+		mode = mode,
+		-- We can't read the password interactively when daemonized
+		password = function() log("error", "Encrypted certificate for %s requires 'ssl' 'password' to be set in config", host); end;
+	});
+	cfg:apply(global_ssl_config);
+
+	for i = select('#', ...), 1, -1 do
+		cfg:apply(select(i, ...));
+	end
+	local user_ssl_config = cfg:final();
+
+	if mode == "server" then
+		if not user_ssl_config.key then return nil, "No key present in SSL/TLS configuration for "..host; end
+		if not user_ssl_config.certificate then return nil, "No certificate present in SSL/TLS configuration for "..host; end
+	end
+
+	for option in pairs(path_options) do
+		if type(user_ssl_config[option]) == "string" then
+			user_ssl_config[option] = resolve_path(config_path, user_ssl_config[option]);
+		else
+			user_ssl_config[option] = nil;
+		end
+	end
 
 	-- 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 type(user_ssl_config.dhparam) == "string" then
+		local f, err = io_open(user_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
+		user_ssl_config.dhparam = function() return dhparam; end
 	end
 
-	local ctx, err = ssl_newcontext(ssl_config);
+	local ctx, err = ssl_newcontext(user_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
+	-- COMPAT Older LuaSec ignores the cipher list from the config, so we have to take care
+	-- of it ourselves (W/A for #x)
+	if ctx and user_ssl_config.ciphers then
 		local success;
-		success, err = ssl.context.setcipher(ctx, ssl_config.ciphers);
+		success, err = ssl_context.setcipher(ctx, user_ssl_config.ciphers);
 		if not success then ctx = nil; end
 	end
 
@@ -99,10 +213,13 @@ function create_context(host, mode, user_ssl_config)
 		err = err or "invalid ssl config"
 		local file = err:match("^error loading (.-) %(");
 		if file then
+			local typ;
 			if file == "private key" then
-				file = ssl_config.key or "your private key";
+				typ = file;
+				file = user_ssl_config.key or "your private key";
 			elseif file == "certificate" then
-				file = ssl_config.certificate or "your certificate file";
+				typ = file;
+				file = user_ssl_config.certificate or "your certificate file";
 			end
 			local reason = err:match("%((.+)%)$") or "some reason";
 			if reason == "Permission denied" then
@@ -111,6 +228,8 @@ function create_context(host, mode, user_ssl_config)
 				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 == "no start line" then
+				reason = "Check that the file contains a "..(typ or file);
 			elseif reason == "(null)" or not reason then
 				reason = "Check that the file exists and the permissions are correct";
 			else
@@ -121,13 +240,21 @@ function create_context(host, mode, user_ssl_config)
 			log("error", "SSL/TLS: Error initialising for %s: %s", host, err);
 		end
 	end
-	return ctx, err;
+	return ctx, err, user_ssl_config;
 end
 
-function reload_ssl_config()
-	default_ssl_config = configmanager.get("*", "ssl");
+local function reload_ssl_config()
+	global_ssl_config = configmanager.get("*", "ssl");
+	global_certificates = configmanager.get("*", "certificates") or "certs";
+	if luasec_has.options.no_compression then
+		core_defaults.options.no_compression = configmanager.get("*", "ssl_compression") ~= true;
+	end
 end
 
 prosody.events.add_handler("config-reloaded", reload_ssl_config);
 
-return _M;
+return {
+	create_context = create_context;
+	reload_ssl_config = reload_ssl_config;
+	find_cert = find_cert;
+};