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
|
-- Prosody IM
-- Copyright (C) 2008-2011 Matthew Wild
-- Copyright (C) 2008-2011 Waqas Hussain
-- Copyright (C) 2009 Thilo Cestonaro
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
module:set_global();
local jid_compare, jid_prep = require "util.jid".compare, require "util.jid".prep;
local st = require "util.stanza";
local sha1 = require "util.hashes".sha1;
local server = require "net.server";
local portmanager = require "core.portmanager";
local sessions = module:shared("sessions");
local transfers = module:shared("transfers");
local max_buffer_size = 4096;
local listener = {};
function listener.onincoming(conn, data)
local session = sessions[conn] or {};
local transfer = transfers[session.sha];
if transfer and transfer.activated then -- copy data between initiator and target
local initiator, target = transfer.initiator, transfer.target;
(conn == initiator and target or initiator):write(data);
return;
end -- FIXME server.link should be doing this?
if not session.greeting_done then
local nmethods = data:byte(2) or 0;
if data:byte(1) == 0x05 and nmethods > 0 and #data == 2 + nmethods then -- check if we have all the data
if data:find("%z") then -- 0x00 = 'No authentication' is supported
session.greeting_done = true;
sessions[conn] = session;
conn:write("\5\0"); -- send (SOCKS version 5, No authentication)
module:log("debug", "SOCKS5 greeting complete");
return;
end
end -- else error, unexpected input
conn:write("\5\255"); -- send (SOCKS version 5, no acceptable method)
conn:close();
module:log("debug", "Invalid SOCKS5 greeting received: %q", data:sub(1, 300));
else -- connection request
--local head = string.char( 0x05, 0x01, 0x00, 0x03, 40 ); -- ( VER=5=SOCKS5, CMD=1=CONNECT, RSV=0=RESERVED, ATYP=3=DOMAIMNAME, SHA-1 size )
if #data == 47 and data:sub(1,5) == "\5\1\0\3\40" and data:sub(-2) == "\0\0" then
local sha = data:sub(6, 45);
conn:pause();
conn:write("\5\0\0\3\40" .. sha .. "\0\0"); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
if not transfers[sha] then
transfers[sha] = {};
transfers[sha].target = conn;
session.sha = sha;
module:log("debug", "SOCKS5 target connected for session %s", sha);
else -- transfers[sha].target ~= nil
transfers[sha].initiator = conn;
session.sha = sha;
module:log("debug", "SOCKS5 initiator connected for session %s", sha);
server.link(conn, transfers[sha].target, max_buffer_size);
server.link(transfers[sha].target, conn, max_buffer_size);
end
else -- error, unexpected input
conn:write("\5\1\0\3\0\0\0"); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
conn:close();
module:log("debug", "Invalid SOCKS5 negotiation received: %q", data:sub(1, 300));
end
end
end
function listener.ondisconnect(conn)
local session = sessions[conn];
if session then
if transfers[session.sha] then
local initiator, target = transfers[session.sha].initiator, transfers[session.sha].target;
if initiator == conn and target ~= nil then
target:close();
elseif target == conn and initiator ~= nil then
initiator:close();
end
transfers[session.sha] = nil;
end
-- Clean up any session-related stuff here
sessions[conn] = nil;
end
end
function module.add_host(module)
local host, name = module:get_host(), module:get_option_string("name", "SOCKS5 Bytestreams Service");
local proxy_address = module:get_option_string("proxy65_address", host);
local proxy_acl = module:get_option_array("proxy65_acl");
-- COMPAT w/pre-0.9 where proxy65_port was specified in the components section of the config
local legacy_config = module:get_option_number("proxy65_port");
if legacy_config then
module:log("warn", "proxy65_port is deprecated, please put proxy65_ports = { %d } into the global section instead", legacy_config);
end
module:depends("disco");
module:add_identity("proxy", "bytestreams", name);
module:add_feature("http://jabber.org/protocol/bytestreams");
module:hook("iq-get/host/http://jabber.org/protocol/bytestreams:query", function(event)
local origin, stanza = event.origin, event.stanza;
-- check ACL
-- using 'while' instead of 'if' so we can break out of it
while proxy_acl and #proxy_acl > 0 do --luacheck: ignore 512
local jid = stanza.attr.from;
local allow;
for _, acl in ipairs(proxy_acl) do
if jid_compare(jid, acl) then allow = true; break; end
end
if allow then break; end
module:log("warn", "Denying use of proxy for %s", stanza.attr.from);
origin.send(st.error_reply(stanza, "auth", "forbidden"));
return true;
end
local proxy_port = next(portmanager.get_active_services():search("proxy65", nil)[1] or {});
if not proxy_port then
module:log("warn", "Not listening on any port");
origin.send(st.error_reply(stanza, "wait", "item-not-found", "Not listening on any port"));
return true;
end
local sid = stanza.tags[1].attr.sid;
origin.send(st.reply(stanza):tag("query", {xmlns="http://jabber.org/protocol/bytestreams", sid=sid})
:tag("streamhost", {jid=host, host=proxy_address, port=("%d"):format(proxy_port)}));
return true;
end);
module:hook("iq-set/host/http://jabber.org/protocol/bytestreams:query", function(event)
local origin, stanza = event.origin, event.stanza;
local query = stanza.tags[1];
local sid = query.attr.sid;
local from = stanza.attr.from;
local to = query:get_child_text("activate");
local prepped_to = jid_prep(to);
local info = "sid: "..tostring(sid)..", initiator: "..tostring(from)..", target: "..tostring(prepped_to or to);
if prepped_to and sid then
local sha = sha1(sid .. from .. prepped_to, true);
if not transfers[sha] then
module:log("debug", "Activation request has unknown session id; activation failed (%s)", info);
origin.send(st.error_reply(stanza, "modify", "item-not-found"));
elseif not transfers[sha].initiator then
module:log("debug", "The sender was not connected to the proxy; activation failed (%s)", info);
origin.send(st.error_reply(stanza, "cancel", "not-allowed", "The sender (you) is not connected to the proxy"));
--elseif not transfers[sha].target then -- can't happen, as target is set when a transfer object is created
-- module:log("debug", "The recipient was not connected to the proxy; activation failed (%s)", info);
-- origin.send(st.error_reply(stanza, "cancel", "not-allowed", "The recipient is not connected to the proxy"));
else -- if transfers[sha].initiator ~= nil and transfers[sha].target ~= nil then
module:log("debug", "Transfer activated (%s)", info);
transfers[sha].activated = true;
transfers[sha].target:resume();
transfers[sha].initiator:resume();
origin.send(st.reply(stanza));
end
elseif to and sid then
module:log("debug", "Malformed activation jid; activation failed (%s)", info);
origin.send(st.error_reply(stanza, "modify", "jid-malformed"));
else
module:log("debug", "Bad request; activation failed (%s)", info);
origin.send(st.error_reply(stanza, "modify", "bad-request"));
end
return true;
end);
end
module:provides("net", {
default_port = 5000;
listener = listener;
multiplex = {
pattern = "^\5";
};
});
|
