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595 lines
21 KiB
595 lines
21 KiB
-- 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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local hosts = hosts;
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local sessions = sessions;
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local core_process_stanza = function(a, b) core_process_stanza(a, b); end
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local add_task = require "util.timer".add_task;
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local socket = require "socket";
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local format = string.format;
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local t_insert, t_sort = table.insert, table.sort;
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local get_traceback = debug.traceback;
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local tostring, pairs, ipairs, getmetatable, newproxy, error, tonumber,
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setmetatable
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= tostring, pairs, ipairs, getmetatable, newproxy, error, tonumber,
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setmetatable;
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local idna_to_ascii = require "util.encodings".idna.to_ascii;
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local connlisteners_get = require "net.connlisteners".get;
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local initialize_filters = require "util.filters".initialize;
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local wrapclient = require "net.server".wrapclient;
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local modulemanager = require "core.modulemanager";
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local st = require "stanza";
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local stanza = st.stanza;
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local nameprep = require "util.encodings".stringprep.nameprep;
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local fire_event = prosody.events.fire_event;
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local uuid_gen = require "util.uuid".generate;
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local logger_init = require "util.logger".init;
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local log = logger_init("s2smanager");
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local sha256_hash = require "util.hashes".sha256;
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local adns, dns = require "net.adns", require "net.dns";
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local config = require "core.configmanager";
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local connect_timeout = config.get("*", "core", "s2s_timeout") or 60;
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local dns_timeout = config.get("*", "core", "dns_timeout") or 15;
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local max_dns_depth = config.get("*", "core", "dns_max_depth") or 3;
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dns.settimeout(dns_timeout);
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local prosody = _G.prosody;
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incoming_s2s = {};
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prosody.incoming_s2s = incoming_s2s;
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local incoming_s2s = incoming_s2s;
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module "s2smanager"
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function compare_srv_priorities(a,b)
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return a.priority < b.priority or (a.priority == b.priority and a.weight > b.weight);
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end
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local bouncy_stanzas = { message = true, presence = true, iq = true };
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local function bounce_sendq(session, reason)
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local sendq = session.sendq;
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if sendq then
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session.log("info", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host));
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local dummy = {
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type = "s2sin";
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send = function(s)
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(session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", get_traceback());
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end;
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dummy = true;
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};
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for i, data in ipairs(sendq) do
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local reply = data[2];
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local xmlns = reply.attr.xmlns;
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if not(xmlns) and bouncy_stanzas[reply.name] then
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reply.attr.type = "error";
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reply:tag("error", {type = "cancel"})
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:tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();
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if reason then
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reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):text("Connection failed: "..reason):up();
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end
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core_process_stanza(dummy, reply);
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end
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sendq[i] = nil;
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end
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session.sendq = nil;
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end
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end
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function send_to_host(from_host, to_host, data)
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if not hosts[from_host] then
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log("warn", "Attempt to send stanza from %s - a host we don't serve", from_host);
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return false;
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end
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local host = hosts[from_host].s2sout[to_host];
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if host then
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-- We have a connection to this host already
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if host.type == "s2sout_unauthed" and (data.name ~= "db:verify" or not host.dialback_key) then
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(host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host);
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-- Queue stanza until we are able to send it
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if host.sendq then t_insert(host.sendq, {tostring(data), st.reply(data)});
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else host.sendq = { {tostring(data), st.reply(data)} }; end
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host.log("debug", "stanza [%s] queued ", data.name);
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elseif host.type == "local" or host.type == "component" then
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log("error", "Trying to send a stanza to ourselves??")
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log("error", "Traceback: %s", get_traceback());
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log("error", "Stanza: %s", tostring(data));
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else
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(host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host);
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-- FIXME
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if host.from_host ~= from_host then
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log("error", "WARNING! This might, possibly, be a bug, but it might not...");
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log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host));
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end
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host.sends2s(data);
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host.log("debug", "stanza sent over "..host.type);
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end
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else
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log("debug", "opening a new outgoing connection for this stanza");
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local host_session = new_outgoing(from_host, to_host);
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-- Store in buffer
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host_session.sendq = { {tostring(data), st.reply(data)} };
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log("debug", "stanza [%s] queued until connection complete", tostring(data.name));
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if (not host_session.connecting) and (not host_session.conn) then
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log("warn", "Connection to %s failed already, destroying session...", to_host);
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destroy_session(host_session);
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end
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end
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end
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local open_sessions = 0;
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function new_incoming(conn)
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local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming", hosts = {} };
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if true then
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session.trace = newproxy(true);
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getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end;
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end
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open_sessions = open_sessions + 1;
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local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$"));
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session.log = log;
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local filter = initialize_filters(session);
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session.sends2s = function (t)
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log("debug", "sending: %s", t.top_tag and t:top_tag() or t:match("^([^>]*>?)"));
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if t.name then
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t = filter("stanzas/out", t);
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end
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if t then
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t = filter("bytes/out", tostring(t));
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if t then
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return w(conn, t);
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end
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end
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end
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incoming_s2s[session] = true;
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add_task(connect_timeout, function ()
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if session.conn ~= conn or
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session.type == "s2sin" then
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return; -- Ok, we're connect[ed|ing]
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end
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-- Not connected, need to close session and clean up
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(session.log or log)("warn", "Destroying incomplete session %s->%s due to inactivity",
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session.from_host or "(unknown)", session.to_host or "(unknown)");
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session:close("connection-timeout");
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end);
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return session;
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end
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function new_outgoing(from_host, to_host, connect)
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local host_session = { to_host = to_host, from_host = from_host, host = from_host,
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notopen = true, type = "s2sout_unauthed", direction = "outgoing",
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open_stream = session_open_stream };
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hosts[from_host].s2sout[to_host] = host_session;
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local log;
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do
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local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$");
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log = logger_init(conn_name);
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host_session.log = log;
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end
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initialize_filters(host_session);
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if connect ~= false then
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-- Kick the connection attempting machine into life
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attempt_connection(host_session);
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end
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if not host_session.sends2s then
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-- A sends2s which buffers data (until the stream is opened)
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-- note that data in this buffer will be sent before the stream is authed
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-- and will not be ack'd in any way, successful or otherwise
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local buffer;
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function host_session.sends2s(data)
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if not buffer then
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buffer = {};
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host_session.send_buffer = buffer;
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end
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log("debug", "Buffering data on unconnected s2sout to %s", to_host);
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buffer[#buffer+1] = data;
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log("debug", "Buffered item %d: %s", #buffer, tostring(data));
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end
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end
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return host_session;
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end
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function attempt_connection(host_session, err)
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local from_host, to_host = host_session.from_host, host_session.to_host;
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local connect_host, connect_port = to_host and idna_to_ascii(to_host), 5269;
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if not connect_host then
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return false;
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end
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if not err then -- This is our first attempt
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log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host);
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host_session.connecting = true;
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local handle;
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handle = adns.lookup(function (answer)
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handle = nil;
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host_session.connecting = nil;
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if answer then
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log("debug", to_host.." has SRV records, handling...");
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local srv_hosts = {};
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host_session.srv_hosts = srv_hosts;
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for _, record in ipairs(answer) do
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t_insert(srv_hosts, record.srv);
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end
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t_sort(srv_hosts, compare_srv_priorities);
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local srv_choice = srv_hosts[1];
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host_session.srv_choice = 1;
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if srv_choice then
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connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port;
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log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port);
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end
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else
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log("debug", to_host.." has no SRV records, falling back to A");
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end
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-- Try with SRV, or just the plain hostname if no SRV
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local ok, err = try_connect(host_session, connect_host, connect_port);
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if not ok then
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if not attempt_connection(host_session, err) then
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-- No more attempts will be made
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destroy_session(host_session, err);
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end
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end
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end, "_xmpp-server._tcp."..connect_host..".", "SRV");
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return true; -- Attempt in progress
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elseif host_session.srv_hosts and #host_session.srv_hosts > host_session.srv_choice then -- Not our first attempt, and we also have SRV
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host_session.srv_choice = host_session.srv_choice + 1;
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local srv_choice = host_session.srv_hosts[host_session.srv_choice];
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connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port;
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host_session.log("info", "Connection failed (%s). Attempt #%d: This time to %s:%d", tostring(err), host_session.srv_choice, connect_host, connect_port);
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else
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host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host));
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-- We're out of options
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return false;
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end
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if not (connect_host and connect_port) then
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-- Likely we couldn't resolve DNS
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log("warn", "Hmm, we're without a host (%s) and port (%s) to connect to for %s, giving up :(", tostring(connect_host), tostring(connect_port), tostring(to_host));
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return false;
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end
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return try_connect(host_session, connect_host, connect_port);
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end
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function try_connect(host_session, connect_host, connect_port)
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host_session.connecting = true;
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local handle;
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handle = adns.lookup(function (reply)
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handle = nil;
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host_session.connecting = nil;
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-- COMPAT: This is a compromise for all you CNAME-(ab)users :)
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if not (reply and reply[#reply] and reply[#reply].a) then
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local count = max_dns_depth;
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reply = dns.peek(connect_host, "CNAME", "IN");
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while count > 0 and reply and reply[#reply] and not reply[#reply].a and reply[#reply].cname do
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log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[#reply].cname), count);
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reply = dns.peek(reply[#reply].cname, "A", "IN") or dns.peek(reply[#reply].cname, "CNAME", "IN");
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count = count - 1;
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end
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end
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-- end of CNAME resolving
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if reply and reply[#reply] and reply[#reply].a then
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log("debug", "DNS reply for %s gives us %s", connect_host, reply[#reply].a);
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return make_connect(host_session, reply[#reply].a, connect_port);
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else
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log("debug", "DNS lookup failed to get a response for %s", connect_host);
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if not attempt_connection(host_session, "name resolution failed") then -- Retry if we can
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log("debug", "No other records to try for %s - destroying", host_session.to_host);
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destroy_session(host_session, "DNS resolution failed"); -- End of the line, we can't
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end
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end
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end, connect_host, "A", "IN");
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return true;
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end
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function make_connect(host_session, connect_host, connect_port)
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(host_session.log or log)("info", "Beginning new connection attempt to %s (%s:%d)", host_session.to_host, connect_host, connect_port);
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-- Ok, we're going to try to connect
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local from_host, to_host = host_session.from_host, host_session.to_host;
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local conn, handler = socket.tcp()
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if not conn then
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log("warn", "Failed to create outgoing connection, system error: %s", handler);
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return false, handler;
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end
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conn:settimeout(0);
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local success, err = conn:connect(connect_host, connect_port);
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if not success and err ~= "timeout" then
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log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host, connect_port, err);
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return false, err;
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end
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local cl = connlisteners_get("xmppserver");
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conn = wrapclient(conn, connect_host, connect_port, cl, cl.default_mode or 1 );
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host_session.conn = conn;
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local filter = initialize_filters(host_session);
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local w, log = conn.write, host_session.log;
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host_session.sends2s = function (t)
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log("debug", "sending: %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?"));
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if t.name then
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t = filter("stanzas/out", t);
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end
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if t then
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t = filter("bytes/out", tostring(t));
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if t then
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return w(conn, tostring(t));
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end
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end
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end
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-- Register this outgoing connection so that xmppserver_listener knows about it
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-- otherwise it will assume it is a new incoming connection
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cl.register_outgoing(conn, host_session);
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host_session:open_stream(from_host, to_host);
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log("debug", "Connection attempt in progress...");
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add_task(connect_timeout, function ()
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if host_session.conn ~= conn or
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host_session.type == "s2sout" or
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host_session.connecting then
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return; -- Ok, we're connect[ed|ing]
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end
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-- Not connected, need to close session and clean up
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(host_session.log or log)("warn", "Destroying incomplete session %s->%s due to inactivity",
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host_session.from_host or "(unknown)", host_session.to_host or "(unknown)");
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host_session:close("connection-timeout");
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end);
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return true;
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end
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function session_open_stream(session, from, to)
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session.sends2s(st.stanza("stream:stream", {
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xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
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["xmlns:stream"]='http://etherx.jabber.org/streams',
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from=from, to=to, version='1.0', ["xml:lang"]='en'}):top_tag());
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end
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function streamopened(session, attr)
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local send = session.sends2s;
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-- TODO: #29: SASL/TLS on s2s streams
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session.version = tonumber(attr.version) or 0;
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if session.secure == false then
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session.secure = true;
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end
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if session.direction == "incoming" then
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-- Send a reply stream header
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session.to_host = attr.to and nameprep(attr.to);
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session.from_host = attr.from and nameprep(attr.from);
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session.streamid = uuid_gen();
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(session.log or log)("debug", "incoming s2s received <stream:stream>");
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if session.to_host then
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if not hosts[session.to_host] then
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-- Attempting to connect to a host we don't serve
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session:close({
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condition = "host-unknown";
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text = "This host does not serve "..session.to_host
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});
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return;
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elseif hosts[session.to_host].disallow_s2s then
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-- Attempting to connect to a host that disallows s2s
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session:close({
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condition = "policy-violation";
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text = "Server-to-server communication is not allowed to this host";
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});
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return;
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end
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end
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send("<?xml version='1.0'?>");
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send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
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["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host, to=session.from_host, version=(session.version > 0 and "1.0" or nil) }):top_tag());
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if session.version >= 1.0 then
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local features = st.stanza("stream:features");
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if session.to_host then
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hosts[session.to_host].events.fire_event("s2s-stream-features", { origin = session, features = features });
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else
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(session.log or log)("warn", "No 'to' on stream header from %s means we can't offer any features", session.from_host or "unknown host");
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end
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log("debug", "Sending stream features: %s", tostring(features));
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send(features);
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end
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elseif session.direction == "outgoing" then
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-- If we are just using the connection for verifying dialback keys, we won't try and auth it
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if not attr.id then error("stream response did not give us a streamid!!!"); end
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session.streamid = attr.id;
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-- Send unauthed buffer
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-- (stanzas which are fine to send before dialback)
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-- Note that this is *not* the stanza queue (which
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-- we can only send if auth succeeds) :)
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local send_buffer = session.send_buffer;
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if send_buffer and #send_buffer > 0 then
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log("debug", "Sending s2s send_buffer now...");
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for i, data in ipairs(send_buffer) do
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session.sends2s(tostring(data));
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send_buffer[i] = nil;
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end
|
|
end
|
|
session.send_buffer = nil;
|
|
|
|
-- If server is pre-1.0, don't wait for features, just do dialback
|
|
if session.version < 1.0 then
|
|
if not session.dialback_verifying then
|
|
log("debug", "Initiating dialback...");
|
|
initiate_dialback(session);
|
|
else
|
|
mark_connected(session);
|
|
end
|
|
end
|
|
end
|
|
session.notopen = nil;
|
|
end
|
|
|
|
function streamclosed(session)
|
|
(session.log or log)("debug", "Received </stream:stream>");
|
|
session:close();
|
|
end
|
|
|
|
function initiate_dialback(session)
|
|
-- generate dialback key
|
|
session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host);
|
|
session.sends2s(format("<db:result from='%s' to='%s'>%s</db:result>", session.from_host, session.to_host, session.dialback_key));
|
|
session.log("info", "sent dialback key on outgoing s2s stream");
|
|
end
|
|
|
|
function generate_dialback(id, to, from)
|
|
return sha256_hash(id..to..from..hosts[from].dialback_secret, true);
|
|
end
|
|
|
|
function verify_dialback(id, to, from, key)
|
|
return key == generate_dialback(id, to, from);
|
|
end
|
|
|
|
function make_authenticated(session, host)
|
|
if not session.secure then
|
|
local local_host = session.direction == "incoming" and session.to_host or session.from_host;
|
|
if config.get(local_host, "core", "s2s_require_encryption") then
|
|
session:close({
|
|
condition = "policy-violation",
|
|
text = "Encrypted server-to-server communication is required but was not "
|
|
..((session.direction == "outgoing" and "offered") or "used")
|
|
});
|
|
end
|
|
end
|
|
if session.type == "s2sout_unauthed" then
|
|
session.type = "s2sout";
|
|
elseif session.type == "s2sin_unauthed" then
|
|
session.type = "s2sin";
|
|
if host then
|
|
session.hosts[host].authed = true;
|
|
end
|
|
elseif session.type == "s2sin" and host then
|
|
session.hosts[host].authed = true;
|
|
else
|
|
return false;
|
|
end
|
|
session.log("debug", "connection %s->%s is now authenticated", session.from_host or "(unknown)", session.to_host or "(unknown)");
|
|
|
|
mark_connected(session);
|
|
|
|
return true;
|
|
end
|
|
|
|
-- Stream is authorised, and ready for normal stanzas
|
|
function mark_connected(session)
|
|
local sendq, send = session.sendq, session.sends2s;
|
|
|
|
local from, to = session.from_host, session.to_host;
|
|
|
|
session.log("info", session.direction.." s2s connection "..from.."->"..to.." complete");
|
|
|
|
local send_to_host = send_to_host;
|
|
function session.send(data) send_to_host(to, from, data); end
|
|
|
|
local event_data = { session = session };
|
|
if session.type == "s2sout" then
|
|
prosody.events.fire_event("s2sout-established", event_data);
|
|
hosts[session.from_host].events.fire_event("s2sout-established", event_data);
|
|
else
|
|
prosody.events.fire_event("s2sin-established", event_data);
|
|
hosts[session.to_host].events.fire_event("s2sin-established", event_data);
|
|
end
|
|
|
|
if session.direction == "outgoing" then
|
|
if sendq then
|
|
session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host);
|
|
for i, data in ipairs(sendq) do
|
|
send(data[1]);
|
|
sendq[i] = nil;
|
|
end
|
|
session.sendq = nil;
|
|
end
|
|
|
|
session.srv_hosts = nil;
|
|
end
|
|
end
|
|
|
|
local resting_session = { -- Resting, not dead
|
|
destroyed = true;
|
|
type = "s2s_destroyed";
|
|
open_stream = function (session)
|
|
session.log("debug", "Attempt to open stream on resting session");
|
|
end;
|
|
close = function (session)
|
|
session.log("debug", "Attempt to close already-closed session");
|
|
end;
|
|
filter = function (type, data) return data; end;
|
|
}; resting_session.__index = resting_session;
|
|
|
|
function retire_session(session)
|
|
local log = session.log or log;
|
|
for k in pairs(session) do
|
|
if k ~= "trace" and k ~= "log" and k ~= "id" then
|
|
session[k] = nil;
|
|
end
|
|
end
|
|
|
|
function session.send(data) log("debug", "Discarding data sent to resting session: %s", tostring(data)); end
|
|
function session.data(data) log("debug", "Discarding data received from resting session: %s", tostring(data)); end
|
|
return setmetatable(session, resting_session);
|
|
end
|
|
|
|
function destroy_session(session, reason)
|
|
if session.destroyed then return; end
|
|
(session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host));
|
|
|
|
if session.direction == "outgoing" then
|
|
hosts[session.from_host].s2sout[session.to_host] = nil;
|
|
bounce_sendq(session, reason);
|
|
elseif session.direction == "incoming" then
|
|
incoming_s2s[session] = nil;
|
|
end
|
|
|
|
local event_data = { session = session, reason = reason };
|
|
if session.type == "s2sout" then
|
|
prosody.events.fire_event("s2sout-destroyed", event_data);
|
|
if hosts[session.from_host] then
|
|
hosts[session.from_host].events.fire_event("s2sout-destroyed", event_data);
|
|
end
|
|
elseif session.type == "s2sin" then
|
|
prosody.events.fire_event("s2sin-destroyed", event_data);
|
|
if hosts[session.to_host] then
|
|
hosts[session.to_host].events.fire_event("s2sin-destroyed", event_data);
|
|
end
|
|
end
|
|
|
|
retire_session(session); -- Clean session until it is GC'd
|
|
end
|
|
|
|
return _M;
|
|
|