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https://github.com/bjc/prosody.git
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260 lines
9 KiB
Lua
260 lines
9 KiB
Lua
-- Copyright (C) 2009 Thilo Cestonaro
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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--[[
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* to restart the proxy in the console: e.g.
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module:unload("proxy65");
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> server.removeserver(<proxy65_port>);
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module:load("proxy65", <proxy65_jid>);
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]]--
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if module:get_host_type() ~= "component" then
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error("proxy65 should be loaded as a component, please see http://prosody.im/doc/components", 0);
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end
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local jid_split, jid_join, jid_compare = require "util.jid".split, require "util.jid".join, require "util.jid".compare;
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local st = require "util.stanza";
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local config_get = require "core.configmanager".get;
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local connlisteners = require "net.connlisteners";
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local sha1 = require "util.hashes".sha1;
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local server = require "net.server";
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local host, name = module:get_host(), "SOCKS5 Bytestreams Service";
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local sessions, transfers, component, replies_cache = {}, {}, nil, {};
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local proxy_port = config_get(host, "core", "proxy65_port") or 5000;
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local proxy_interface = config_get(host, "core", "proxy65_interface") or "*";
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local proxy_address = config_get(host, "core", "proxy65_address") or (proxy_interface ~= "*" and proxy_interface) or host;
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local proxy_acl = config_get(host, "core", "proxy65_acl");
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local max_buffer_size = 4096;
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local connlistener = { default_port = proxy_port, default_interface = proxy_interface, default_mode = "*a" };
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function connlistener.onincoming(conn, data)
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local session = sessions[conn] or {};
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if session.setup == nil and data ~= nil and data:sub(1):byte() == 0x05 and data:len() > 2 then
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local nmethods = data:sub(2):byte();
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local methods = data:sub(3);
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local supported = false;
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for i=1, nmethods, 1 do
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if(methods:sub(i):byte() == 0x00) then -- 0x00 == method: NO AUTH
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supported = true;
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break;
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end
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end
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if(supported) then
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module:log("debug", "new session found ... ")
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session.setup = true;
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sessions[conn] = session;
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conn:write(string.char(5, 0));
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end
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return;
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end
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if session.setup then
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if session.sha ~= nil and transfers[session.sha] ~= nil then
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local sha = session.sha;
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if transfers[sha].activated == true and transfers[sha].target ~= nil then
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if transfers[sha].initiator == conn then
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transfers[sha].target:write(data);
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else
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transfers[sha].initiator:write(data);
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end
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return;
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end
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end
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if data ~= nil and data:len() == 0x2F and -- 40 == length of SHA1 HASH, and 7 other bytes => 47 => 0x2F
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data:sub(1):byte() == 0x05 and -- SOCKS5 has 5 in first byte
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data:sub(2):byte() == 0x01 and -- CMD must be 1
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data:sub(3):byte() == 0x00 and -- RSV must be 0
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data:sub(4):byte() == 0x03 and -- ATYP must be 3
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data:sub(5):byte() == 40 and -- SHA1 HASH length must be 40 (0x28)
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data:sub(-2):byte() == 0x00 and -- PORT must be 0, size 2 byte
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data:sub(-1):byte() == 0x00
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then
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local sha = data:sub(6, 45); -- second param is not count! it's the ending index (included!)
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if transfers[sha] == nil then
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transfers[sha] = {};
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transfers[sha].activated = false;
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transfers[sha].target = conn;
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session.sha = sha;
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module:log("debug", "target connected ... ");
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elseif transfers[sha].target ~= nil then
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transfers[sha].initiator = conn;
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session.sha = sha;
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module:log("debug", "initiator connected ... ");
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server.link(conn, transfers[sha].target, max_buffer_size);
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server.link(transfers[sha].target, conn, max_buffer_size);
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end
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conn:write(string.char(5, 0, 0, 3, sha:len()) .. sha .. string.char(0, 0)); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
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conn:lock_read(true)
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else
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module:log("warn", "Neither data transfer nor initial connect of a participator of a transfer.")
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conn:close();
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end
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else
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if data ~= nil then
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module:log("warn", "unknown connection with no authentication data -> closing it");
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conn:close();
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end
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end
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end
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function connlistener.ondisconnect(conn, err)
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local session = sessions[conn];
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if session then
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if session.sha and transfers[session.sha] then
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local initiator, target = transfers[session.sha].initiator, transfers[session.sha].target;
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if initiator == conn and target ~= nil then
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target:close();
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elseif target == conn and initiator ~= nil then
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initiator:close();
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end
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transfers[session.sha] = nil;
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end
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-- Clean up any session-related stuff here
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sessions[conn] = nil;
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end
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end
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local function get_disco_info(stanza)
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local reply = replies_cache.disco_info;
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if reply == nil then
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reply = st.iq({type='result', from=host}):query("http://jabber.org/protocol/disco#info")
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:tag("identity", {category='proxy', type='bytestreams', name=name}):up()
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:tag("feature", {var="http://jabber.org/protocol/bytestreams"});
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replies_cache.disco_info = reply;
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end
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reply.attr.id = stanza.attr.id;
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reply.attr.to = stanza.attr.from;
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return reply;
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end
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local function get_disco_items(stanza)
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local reply = replies_cache.disco_items;
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if reply == nil then
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reply = st.iq({type='result', from=host}):query("http://jabber.org/protocol/disco#items");
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replies_cache.disco_items = reply;
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end
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reply.attr.id = stanza.attr.id;
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reply.attr.to = stanza.attr.from;
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return reply;
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end
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local function get_stream_host(origin, stanza)
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local reply = replies_cache.stream_host;
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local err_reply = replies_cache.stream_host_err;
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local sid = stanza.tags[1].attr.sid;
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local allow = false;
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local jid = stanza.attr.from;
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if proxy_acl and #proxy_acl > 0 then
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for _, acl in ipairs(proxy_acl) do
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if jid_compare(jid, acl) then allow = true; end
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end
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else
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allow = true;
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end
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if allow == true then
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if reply == nil then
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reply = st.iq({type="result", from=host})
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:query("http://jabber.org/protocol/bytestreams")
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:tag("streamhost", {jid=host, host=proxy_address, port=proxy_port});
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replies_cache.stream_host = reply;
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end
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else
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module:log("warn", "Denying use of proxy for %s", tostring(jid));
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if err_reply == nil then
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err_reply = st.iq({type="error", from=host})
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:query("http://jabber.org/protocol/bytestreams")
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:tag("error", {code='403', type='auth'})
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:tag("forbidden", {xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'});
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replies_cache.stream_host_err = err_reply;
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end
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reply = err_reply;
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end
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reply.attr.id = stanza.attr.id;
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reply.attr.to = stanza.attr.from;
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reply.tags[1].attr.sid = sid;
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return reply;
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end
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module.unload = function()
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connlisteners.deregister(module.host .. ':proxy65');
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end
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local function set_activation(stanza)
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local from, to, sid, reply = nil;
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from = stanza.attr.from;
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if stanza.tags[1] ~= nil and tostring(stanza.tags[1].name) == "query" then
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if stanza.tags[1].attr ~= nil then
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sid = stanza.tags[1].attr.sid;
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end
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if stanza.tags[1].tags[1] ~= nil and tostring(stanza.tags[1].tags[1].name) == "activate" then
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to = stanza.tags[1].tags[1][1];
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end
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end
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if from ~= nil and to ~= nil and sid ~= nil then
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reply = st.iq({type="result", from=host, to=from});
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reply.attr.id = stanza.attr.id;
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end
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return reply, from, to, sid;
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end
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function handle_to_domain(event)
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local origin, stanza = event.origin, event.stanza;
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if stanza.attr.type == "get" then
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local xmlns = stanza.tags[1].attr.xmlns
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if xmlns == "http://jabber.org/protocol/disco#info" then
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origin.send(get_disco_info(stanza));
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return true;
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elseif xmlns == "http://jabber.org/protocol/disco#items" then
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origin.send(get_disco_items(stanza));
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return true;
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elseif xmlns == "http://jabber.org/protocol/bytestreams" then
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origin.send(get_stream_host(origin, stanza));
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return true;
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else
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origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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return true;
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end
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else -- stanza.attr.type == "set"
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module:log("debug", "Received activation request from %s", stanza.attr.from);
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local reply, from, to, sid = set_activation(stanza);
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if reply ~= nil and from ~= nil and to ~= nil and sid ~= nil then
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local sha = sha1(sid .. from .. to, true);
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if transfers[sha] == nil then
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module:log("error", "transfers[sha]: nil");
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elseif(transfers[sha] ~= nil and transfers[sha].initiator ~= nil and transfers[sha].target ~= nil) then
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origin.send(reply);
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transfers[sha].activated = true;
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transfers[sha].target:lock_read(false);
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transfers[sha].initiator:lock_read(false);
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else
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module:log("debug", "Both parties were not yet connected");
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local message = "Neither party is connected to the proxy";
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if transfers[sha].initiator then
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message = "The recipient is not connected to the proxy";
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elseif transfers[sha].target then
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message = "The sender (you) is not connected to the proxy";
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end
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origin.send(st.error_reply(stanza, "cancel", "not-allowed", message));
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end
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return true;
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else
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module:log("error", "activation failed: sid: %s, initiator: %s, target: %s", tostring(sid), tostring(from), tostring(to));
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end
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end
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end
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module:hook("iq/host", handle_to_domain);
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if not connlisteners.register(module.host .. ':proxy65', connlistener) then
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module:log("error", "mod_proxy65: Could not establish a connection listener. Check your configuration please.");
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module:log("error", "Possibly two proxy65 components are configured to share the same port.");
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end
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connlisteners.start(module.host .. ':proxy65');
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