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plugins/mod_proxy65.lua @ 11074:3473bc8d80c9
Merge 0.11->trunk
author | Matthew Wild <mwild1@gmail.com> |
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date | Sat, 19 Sep 2020 20:49:24 +0100 |
parent | 11012:027af78d8125 |
child | 11560:3bbb1af92514 |
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-- 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"; }; });