aboutsummaryrefslogtreecommitdiffstats
path: root/core/certmanager.lua
blob: 5cbec241ce7a945b2da2fffb74919b80f720150c (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
-- 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 pairs = pairs;
local type = type;
local io_open = io.open;
local t_concat = table.concat;

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 global_ssl_config = configmanager.get("*", "ssl");

local core_defaults = {
	capath = "/etc/ssl/certs";
	protocol = "sslv23";
	verify = (ssl and ssl.x509 and { "peer", "client_once", }) or "none";
	options = { "no_sslv2", "no_sslv3", "cipher_server_preference", luasec_has_noticket and "no_ticket" or nil };
	verifyext = { "lsec_continue", "lsec_ignore_purpose" };
	curve = "secp384r1";
	ciphers = "HIGH+kEDH:HIGH+kEECDH:HIGH:!PSK:!SRP:!3DES:!aNULL";
}
local path_options = { -- These we pass through resolve_path()
	key = true, certificate = true, cafile = true, capath = true, dhparam = true
}

if ssl and not luasec_has_verifyext 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

if luasec_has_no_compression then -- Has no_compression? Then it has these too...
	core_defaults.options[#core_defaults.options+1] = "single_dh_use";
	core_defaults.options[#core_defaults.options+1] = "single_ecdh_use";
	if configmanager.get("*", "ssl_compression") ~= true then
		core_defaults.options[#core_defaults.options+1] = "no_compression";
	end
end

function create_context(host, mode, user_ssl_config)
	user_ssl_config = user_ssl_config or {}
	user_ssl_config.mode = mode;

	if not ssl then return nil, "LuaSec (required for encryption) was not found"; end

	if global_ssl_config then
		for option,default_value in pairs(global_ssl_config) do
			if user_ssl_config[option] == nil then
				user_ssl_config[option] = default_value;
			end
		end
	end

	for option,default_value in pairs(core_defaults) do
		if user_ssl_config[option] == nil then
			user_ssl_config[option] = default_value;
		end
	end

	-- We can't read the password interactively when daemonized
	user_ssl_config.password = user_ssl_config.password or
		function() log("error", "Encrypted certificate for %s requires 'ssl' 'password' to be set in config", host); 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]);
		end
	end

	-- Allow the cipher list to be a table
	if type(user_ssl_config.ciphers) == "table" then
		user_ssl_config.ciphers = t_concat(user_ssl_config.ciphers, ":")
	end

	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

	-- 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
			if file == "private key" then
				file = user_ssl_config.key or "your private key";
			elseif file == "certificate" then
				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 == "(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()
	global_ssl_config = configmanager.get("*", "ssl");
end

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

return _M;