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-rw-r--r--plugins/mod_proxy65.lua121
1 files changed, 52 insertions, 69 deletions
diff --git a/plugins/mod_proxy65.lua b/plugins/mod_proxy65.lua
index b3fc0b93..d02f3b58 100644
--- a/plugins/mod_proxy65.lua
+++ b/plugins/mod_proxy65.lua
@@ -1,3 +1,6 @@
+-- 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
@@ -18,6 +21,7 @@ local st = require "util.stanza";
local connlisteners = require "net.connlisteners";
local sha1 = require "util.hashes".sha1;
local server = require "net.server";
+local b64 = require "util.encodings".base64.encode;
local host, name = module:get_host(), "SOCKS5 Bytestreams Service";
local sessions, transfers = {}, {};
@@ -32,70 +36,50 @@ local connlistener = { default_port = proxy_port, default_interface = proxy_inte
function connlistener.onincoming(conn, data)
local session = sessions[conn] or {};
-
- if session.setup == nil and data ~= nil and data:byte(1) == 0x05 and #data > 2 then
- local nmethods = data:byte(2);
- local methods = data:sub(3);
- local supported = false;
- for i=1, nmethods, 1 do
- if(methods:byte(i) == 0x00) then -- 0x00 == method: NO AUTH
- supported = true;
- break;
- end
- end
- if(supported) then
- module:log("debug", "new session found ... ")
- session.setup = true;
- sessions[conn] = session;
- conn:write(string.char(5, 0));
- end
+
+ 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
- if session.setup then
- if session.sha ~= nil and transfers[session.sha] ~= nil then
- local sha = session.sha;
- if transfers[sha].activated == true and transfers[sha].target ~= nil then
- if transfers[sha].initiator == conn then
- transfers[sha].target:write(data);
- else
- transfers[sha].initiator:write(data);
- end
+ 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
- if data ~= nil and #data == 0x2F and -- 40 == length of SHA1 HASH, and 7 other bytes => 47 => 0x2F
- data:byte(1) == 0x05 and -- SOCKS5 has 5 in first byte
- data:byte(2) == 0x01 and -- CMD must be 1
- data:byte(3) == 0x00 and -- RSV must be 0
- data:byte(4) == 0x03 and -- ATYP must be 3
- data:byte(5) == 40 and -- SHA1 HASH length must be 40 (0x28)
- data:byte(-2) == 0x00 and -- PORT must be 0, size 2 byte
- data:byte(-1) == 0x00
- then
- local sha = data:sub(6, 45); -- second param is not count! it's the ending index (included!)
- if transfers[sha] == nil then
+ end -- else error, unexpected input
+ conn:write("\5\255"); -- send (SOCKS version 5, no acceptable method)
+ conn:close();
+ module:log("debug", "Invalid SOCKS5 greeting recieved: '%s'", b64(data));
+ 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].activated = false;
transfers[sha].target = conn;
session.sha = sha;
- module:log("debug", "target connected ... ");
- elseif transfers[sha].target ~= nil then
+ 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", "initiator connected ... ");
+ 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
- conn:write(string.char(5, 0, 0, 3, #sha) .. sha .. string.char(0, 0)); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
- conn:lock_read(true)
- else
- module:log("warn", "Neither data transfer nor initial connect of a participator of a transfer.")
- conn:close();
- end
- else
- if data ~= nil then
- module:log("warn", "unknown connection with no authentication data -> closing it");
+ 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 recieved: '%s'", b64(data));
end
end
end
@@ -103,7 +87,7 @@ end
function connlistener.ondisconnect(conn, err)
local session = sessions[conn];
if session then
- if session.sha and transfers[session.sha] 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();
@@ -167,31 +151,30 @@ module:hook("iq-set/host/http://jabber.org/protocol/bytestreams:query", function
local to = query:get_child_text("activate");
local prepped_to = jid_prep(to);
- module:log("debug", "received activation request from %s", stanza.attr.from);
+ 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 transfers[sha] == nil then
- module:log("error", "transfers[sha]: nil");
+ 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(transfers[sha] ~= nil and transfers[sha].initiator ~= nil and transfers[sha].target ~= nil) then
+ 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:lock_read(false);
- transfers[sha].initiator:lock_read(false);
+ transfers[sha].target:resume();
+ transfers[sha].initiator:resume();
origin.send(st.reply(stanza));
- else
- module:log("debug", "Both parties were not yet connected");
- local message = "Neither party is connected to the proxy";
- if transfers[sha].initiator then
- message = "The recipient is not connected to the proxy";
- elseif transfers[sha].target then
- message = "The sender (you) is not connected to the proxy";
- end
- origin.send(st.error_reply(stanza, "cancel", "not-allowed", message));
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("error", "activation failed: sid: %s, initiator: %s, target: %s", tostring(sid), tostring(from), tostring(to));
+ module:log("debug", "Bad request; activation failed (%s)", info);
origin.send(st.error_reply(stanza, "modify", "bad-request"));
end
return true;