aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_tls.lua
blob: d9593b4c7c3c8aa63a305808bb1319343d7f34ba (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
-- 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 create_context = require "core.certmanager".create_context;
local rawgetopt = require"core.configmanager".rawget;
local st = require "util.stanza";

local c2s_require_encryption = module:get_option("c2s_require_encryption", module:get_option("require_encryption"));
local s2s_require_encryption = module:get_option("s2s_require_encryption");
local allow_s2s_tls = module:get_option("s2s_allow_encryption") ~= false;
local s2s_secure_auth = module:get_option("s2s_secure_auth");

if s2s_secure_auth and s2s_require_encryption == false then
	module:log("warn", "s2s_secure_auth implies s2s_require_encryption, but s2s_require_encryption is set to false");
	s2s_require_encryption = true;
end

local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';
local starttls_attr = { xmlns = xmlns_starttls };
local starttls_initiate= st.stanza("starttls", starttls_attr);
local starttls_proceed = st.stanza("proceed", starttls_attr);
local starttls_failure = st.stanza("failure", starttls_attr);
local c2s_feature = st.stanza("starttls", starttls_attr);
local s2s_feature = st.stanza("starttls", starttls_attr);
if c2s_require_encryption then c2s_feature:tag("required"):up(); end
if s2s_require_encryption then s2s_feature:tag("required"):up(); end

local hosts = prosody.hosts;
local host = hosts[module.host];

local ssl_ctx_c2s, ssl_ctx_s2sout, ssl_ctx_s2sin;
local ssl_cfg_c2s, ssl_cfg_s2sout, ssl_cfg_s2sin;
do
	local NULL, err = {};
	local modhost = module.host;
	local parent = modhost:match("%.(.*)$");

	local parent_ssl = rawgetopt(parent,  "ssl") or NULL;
	local host_ssl   = rawgetopt(modhost, "ssl") or parent_ssl;

	local global_c2s = rawgetopt("*",     "c2s_ssl") or NULL;
	local parent_c2s = rawgetopt(parent,  "c2s_ssl") or NULL;
	local host_c2s   = rawgetopt(modhost, "c2s_ssl") or parent_c2s;

	local global_s2s = rawgetopt("*",     "s2s_ssl") or NULL;
	local parent_s2s = rawgetopt(parent,  "s2s_ssl") or NULL;
	local host_s2s   = rawgetopt(modhost, "s2s_ssl") or parent_s2s;

	ssl_ctx_c2s, err, ssl_cfg_c2s = create_context(host.host, "server", host_c2s, host_ssl, global_c2s); -- for incoming client connections
	if not ssl_ctx_c2s then module:log("error", "Error creating context for c2s: %s", err); end

	ssl_ctx_s2sout, err, ssl_cfg_s2sout = create_context(host.host, "client", host_s2s, host_ssl, global_s2s); -- for outgoing server connections
	if not ssl_ctx_s2sout then module:log("error", "Error creating contexts for s2sout: %s", err); end

	ssl_ctx_s2sin, err, ssl_cfg_s2sin = create_context(host.host, "server", host_s2s, host_ssl, global_s2s); -- for incoming server connections
	if not ssl_ctx_s2sin then module:log("error", "Error creating contexts for s2sin: %s", err); end
end

local function can_do_tls(session)
	if session.ssl_ctx == false or not session.conn.starttls then
		return false;
	elseif session.ssl_ctx then
		return true;
	end
	if session.type == "c2s_unauthed" then
		session.ssl_ctx = ssl_ctx_c2s;
		session.ssl_cfg = ssl_cfg_c2s;
	elseif session.type == "s2sin_unauthed" and allow_s2s_tls then
		session.ssl_ctx = ssl_ctx_s2sin;
		session.ssl_cfg = ssl_cfg_s2sin;
	elseif session.direction == "outgoing" and allow_s2s_tls then
		session.ssl_ctx = ssl_ctx_s2sout;
		session.ssl_cfg = ssl_cfg_s2sout;
	else
		return false;
	end
	return session.ssl_ctx;
end

-- Hook <starttls/>
module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)
	local origin = event.origin;
	if can_do_tls(origin) then
		(origin.sends2s or origin.send)(starttls_proceed);
		origin:reset_stream();
		origin.conn:starttls(origin.ssl_ctx);
		origin.log("debug", "TLS negotiation started for %s...", origin.type);
		origin.secure = false;
	else
		origin.log("warn", "Attempt to start TLS, but TLS is not available on this %s connection", origin.type);
		(origin.sends2s or origin.send)(starttls_failure);
		origin:close();
	end
	return true;
end);

-- Advertize stream feature
module:hook("stream-features", function(event)
	local origin, features = event.origin, event.features;
	if can_do_tls(origin) then
		features:add_child(c2s_feature);
	end
end);
module:hook("s2s-stream-features", function(event)
	local origin, features = event.origin, event.features;
	if can_do_tls(origin) then
		features:add_child(s2s_feature);
	end
end);

-- For s2sout connections, start TLS if we can
module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)
	module:log("debug", "Received features element");
	if can_do_tls(session) and stanza:get_child("starttls", xmlns_starttls) then
		module:log("debug", "%s is offering TLS, taking up the offer...", session.to_host);
		session.sends2s(starttls_initiate);
		return true;
	end
end, 500);

module:hook_stanza(xmlns_starttls, "proceed", function (session, stanza) -- luacheck: ignore 212/stanza
	if session.type == "s2sout_unauthed" then
		module:log("debug", "Proceeding with TLS on s2sout...");
		session:reset_stream();
		session.conn:starttls(session.ssl_ctx);
		session.secure = false;
		return true;
	end
end);