aboutsummaryrefslogtreecommitdiffstats
path: root/core/certmanager.lua
blob: 5d3cc2c1ea64b5d3033a22f90ea10bdd8bfe19be (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
-- 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_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 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 = 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;
	};
};

local _ENV = nil;
-- luacheck: std none

-- Global SSL options if not overridden per-host
local global_ssl_config = configmanager.get("*", "ssl");

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

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

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

-- Built-in defaults
local core_defaults = {
	capath = "/etc/ssl/certs";
	depth = 9;
	protocol = "tlsv1+";
	verify = "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+kEECDH", -- Ephemeral Elliptic curve Diffie-Hellman key exchange
		"HIGH+kEDH",   -- Ephemeral Diffie-Hellman key exchange, if a 'dhparam' file is set
		"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("^(%S+) 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.certificate then return nil, "No certificate present in SSL/TLS configuration for "..host; end
		if not user_ssl_config.key then return nil, "No key 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(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();
		user_ssl_config.dhparam = function() return dhparam; end
	end

	local ctx, err = ssl_newcontext(user_ssl_config);

	-- 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, user_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
			local typ;
			if file == "private key" then
				typ = file;
				file = user_ssl_config.key or "your private key";
			elseif file == "certificate" then
				typ = file;
				file = user_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 == "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
				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, user_ssl_config;
end

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 {
	create_context = create_context;
	reload_ssl_config = reload_ssl_config;
	find_cert = find_cert;
};