mirror of
https://github.com/bjc/prosody.git
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378 lines
11 KiB
Lua
378 lines
11 KiB
Lua
-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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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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module:set_global();
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local add_task = require "util.timer".add_task;
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local new_xmpp_stream = require "util.xmppstream".new;
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local nameprep = require "util.encodings".stringprep.nameprep;
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local sessionmanager = require "core.sessionmanager";
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local st = require "util.stanza";
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local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
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local uuid_generate = require "util.uuid".generate;
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local xpcall, tostring, type = xpcall, tostring, type;
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local traceback = debug.traceback;
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local t_insert, t_remove = table.insert, table.remove;
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local co_running, co_resume = coroutine.running, coroutine.resume;
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local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
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local log = module._log;
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local c2s_timeout = module:get_option_number("c2s_timeout");
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local stream_close_timeout = module:get_option_number("c2s_close_timeout", 5);
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local opt_keepalives = module:get_option_boolean("c2s_tcp_keepalives", module:get_option_boolean("tcp_keepalives", true));
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local sessions = module:shared("sessions");
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local core_process_stanza = prosody.core_process_stanza;
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local hosts = prosody.hosts;
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local stream_callbacks = { default_ns = "jabber:client" };
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local listener = {};
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--- Stream events handlers
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local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
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function stream_callbacks.streamopened(session, attr)
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local send = session.send;
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session.host = nameprep(attr.to);
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if not session.host then
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session:close{ condition = "improper-addressing",
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text = "A valid 'to' attribute is required on stream headers" };
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return;
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end
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session.version = tonumber(attr.version) or 0;
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session.streamid = uuid_generate();
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(session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
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if not hosts[session.host] or not hosts[session.host].modules.c2s then
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-- We don't serve this host...
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session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
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return;
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end
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send("<?xml version='1.0'?>"..st.stanza("stream:stream", {
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xmlns = 'jabber:client', ["xmlns:stream"] = 'http://etherx.jabber.org/streams';
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id = session.streamid, from = session.host, version = '1.0', ["xml:lang"] = 'en' }):top_tag());
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(session.log or log)("debug", "Sent reply <stream:stream> to client");
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session.notopen = nil;
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-- If session.secure is *false* (not nil) then it means we /were/ encrypting
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-- since we now have a new stream header, session is secured
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if session.secure == false then
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session.secure = true;
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local sock = session.conn:socket();
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if sock.info then
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local info = sock:info();
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(session.log or log)("info", "Stream encrypted (%s) with %s, authenticated with %s and exchanged keys with %s",
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info.protocol, info.encryption, info.authentication, info.key);
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session.compressed = info.compression;
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else
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(session.log or log)("info", "Stream encrypted");
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session.compressed = sock.compression and sock:compression(); --COMPAT mw/luasec-hg
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end
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end
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local features = st.stanza("stream:features");
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hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
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send(features);
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end
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function stream_callbacks.streamclosed(session)
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session.log("debug", "Received </stream:stream>");
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session:close(false);
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end
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function stream_callbacks.error(session, error, data)
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if error == "no-stream" then
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session.log("debug", "Invalid opening stream header");
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session:close("invalid-namespace");
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elseif error == "parse-error" then
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(session.log or log)("debug", "Client XML parse error: %s", tostring(data));
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session:close("not-well-formed");
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elseif error == "stream-error" then
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local condition, text = "undefined-condition";
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for child in data:children() do
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if child.attr.xmlns == xmlns_xmpp_streams then
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if child.name ~= "text" then
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condition = child.name;
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else
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text = child:get_text();
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end
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if condition ~= "undefined-condition" and text then
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break;
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end
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end
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end
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text = condition .. (text and (" ("..text..")") or "");
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session.log("info", "Session closed by remote with error: %s", text);
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session:close(nil, text);
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end
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end
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local function handleerr(err) log("error", "Traceback[c2s]: %s", traceback(tostring(err), 2)); end
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function stream_callbacks.handlestanza(session, stanza)
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stanza = session.filter("stanzas/in", stanza);
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t_insert(session.pending_stanzas, stanza);
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end
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--- Session methods
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local function session_close(session, reason)
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local log = session.log or log;
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if session.conn then
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if session.notopen then
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session.send("<?xml version='1.0'?>");
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session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
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end
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if reason then -- nil == no err, initiated by us, false == initiated by client
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local stream_error = st.stanza("stream:error");
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if type(reason) == "string" then -- assume stream error
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stream_error:tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' });
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elseif type(reason) == "table" then
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if reason.condition then
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stream_error:tag(reason.condition, stream_xmlns_attr):up();
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if reason.text then
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stream_error:tag("text", stream_xmlns_attr):text(reason.text):up();
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end
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if reason.extra then
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stream_error:add_child(reason.extra);
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end
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elseif reason.name then -- a stanza
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stream_error = reason;
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end
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end
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stream_error = tostring(stream_error);
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log("debug", "Disconnecting client, <stream:error> is: %s", stream_error);
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session.send(stream_error);
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end
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session.send("</stream:stream>");
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function session.send() return false; end
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local reason = (reason and (reason.name or reason.text or reason.condition)) or reason;
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session.log("info", "c2s stream for %s closed: %s", session.full_jid or ("<"..session.ip..">"), reason or "session closed");
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-- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
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local conn = session.conn;
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if reason == nil and not session.notopen and session.type == "c2s" then
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-- Grace time to process data from authenticated cleanly-closed stream
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add_task(stream_close_timeout, function ()
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if not session.destroyed then
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session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
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sm_destroy_session(session, reason);
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conn:close();
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end
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end);
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else
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sm_destroy_session(session, reason);
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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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module:hook_global("user-deleted", function(event)
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local username, host = event.username, event.host;
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local user = hosts[host].sessions[username];
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if user and user.sessions then
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for jid, session in pairs(user.sessions) do
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session:close{ condition = "not-authorized", text = "Account deleted" };
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end
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end
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end, 200);
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--- Port listener
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function listener.onconnect(conn)
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local session = sm_new_session(conn);
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sessions[conn] = session;
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session.log("info", "Client connected");
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-- Client is using legacy SSL (otherwise mod_tls sets this flag)
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if conn:ssl() then
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session.secure = true;
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-- Check if TLS compression is used
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local sock = conn:socket();
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if sock.info then
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session.compressed = sock:info"compression";
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elseif sock.compression then
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session.compressed = sock:compression(); --COMPAT mw/luasec-hg
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end
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end
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if opt_keepalives then
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conn:setoption("keepalive", opt_keepalives);
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end
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session.close = session_close;
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local stream = new_xmpp_stream(session, stream_callbacks);
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session.stream = stream;
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session.notopen = true;
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function session.reset_stream()
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session.notopen = true;
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session.stream:reset();
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end
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session.thread = coroutine.create(function (stanza)
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while true do
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core_process_stanza(session, stanza);
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stanza = coroutine.yield("ready");
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end
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end);
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session.pending_stanzas = {};
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local filter = session.filter;
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function session.data(data)
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-- Parse the data, which will store stanzas in session.pending_stanzas
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if data then
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data = filter("bytes/in", data);
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if data then
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local ok, err = stream:feed(data);
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if not ok then
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log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
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session:close("not-well-formed");
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end
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end
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end
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if co_running() ~= session.thread and not session.paused then
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if session.state == "wait" then
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session.state = "ready";
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local ok, state = co_resume(session.thread);
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if not ok then
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log("error", "Traceback[c2s]: %s", state);
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elseif state == "wait" then
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return;
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end
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end
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-- We're not currently running, so start the thread to process pending stanzas
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local s, thread = session.pending_stanzas, session.thread;
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local n = #s;
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while n > 0 and session.state ~= "wait" do
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session.log("debug", "processing %d stanzas", n);
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local consumed;
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for i = 1,n do
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local stanza = s[i];
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local ok, state = co_resume(thread, stanza);
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if not ok then
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log("error", "Traceback[c2s]: %s", state);
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elseif state == "wait" then
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consumed = i;
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session.state = "wait";
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break;
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end
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end
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if not consumed then consumed = n; end
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for i = 1, #s do
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s[i] = s[consumed+i];
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end
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n = #s;
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end
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end
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end
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if c2s_timeout then
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add_task(c2s_timeout, function ()
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if session.type == "c2s_unauthed" then
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session:close("connection-timeout");
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end
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end);
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end
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session.dispatch_stanza = stream_callbacks.handlestanza;
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function session:sleep(by)
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session.log("debug", "Sleeping for %s", by);
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session.paused = by or "?";
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session.conn:pause();
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if co_running() == session.thread then
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coroutine.yield("wait");
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end
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end
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function session:wake(by)
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assert(session.paused == (by or "?"));
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session.log("debug", "Waking for %s", by);
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session.paused = nil;
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session.conn:resume();
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session.data(); --FIXME: next tick?
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end
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end
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function listener.onincoming(conn, data)
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local session = sessions[conn];
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if session then
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session.data(data);
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end
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end
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function listener.ondisconnect(conn, err)
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local session = sessions[conn];
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if session then
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(session.log or log)("info", "Client disconnected: %s", err or "connection closed");
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sm_destroy_session(session, err);
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sessions[conn] = nil;
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end
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end
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function listener.onreadtimeout(conn)
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local session = sessions[conn];
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if session then
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return (hosts[session.host] or prosody).events.fire_event("c2s-read-timeout", { session = session });
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end
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end
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local function keepalive(event)
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return event.session.send(' ');
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end
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function listener.associate_session(conn, session)
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sessions[conn] = session;
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end
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function module.add_host(module)
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module:hook("c2s-read-timeout", keepalive, -1);
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end
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module:hook("c2s-read-timeout", keepalive, -1);
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module:hook("server-stopping", function(event)
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local reason = event.reason;
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for _, session in pairs(sessions) do
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session:close{ condition = "system-shutdown", text = reason };
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end
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end, 1000);
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module:provides("net", {
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name = "c2s";
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listener = listener;
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default_port = 5222;
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encryption = "starttls";
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multiplex = {
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pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:client%1.*>";
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};
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});
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module:provides("net", {
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name = "legacy_ssl";
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listener = listener;
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encryption = "ssl";
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multiplex = {
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pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:client%1.*>";
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};
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});
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