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296 lines
10 KiB
296 lines
10 KiB
-- Prosody IM v0.1
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-- Copyright (C) 2008 Matthew Wild
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-- Copyright (C) 2008 Waqas Hussain
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--
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-- This program is free software; you can redistribute it and/or
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-- modify it under the terms of the GNU General Public License
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-- as published by the Free Software Foundation; either version 2
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-- of the License, or (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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--
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local hosts = hosts;
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local sessions = sessions;
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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, print, newproxy, error, tonumber
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= tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber;
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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 wraptlsclient = require "net.server".wraptlsclient;
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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 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 dialback_secret = sha256_hash(tostring{} .. math.random() .. socket.gettime(), true);
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local dns = require "net.dns";
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module "s2smanager"
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local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end
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function send_to_host(from_host, to_host, data)
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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" and ((not data.xmlns) or data.xmlns == "jabber:client" or data.xmlns == "jabber:server") then
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(host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host);
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if not host.notopen and not host.dialback_key then
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host.log("debug", "dialback had not been initiated");
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initiate_dialback(host);
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end
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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));
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else host.sendq = { tostring(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) };
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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" };
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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]+$"));
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session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end
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return session;
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end
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function new_outgoing(from_host, to_host)
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local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" };
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hosts[from_host].s2sout[to_host] = host_session;
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local log;
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do
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local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$");
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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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attempt_connection(host_session);
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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 conn, handler = socket.tcp()
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local connect_host, connect_port = idna_to_ascii(to_host), 5269;
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if not err then -- This is our first attempt
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local answer = dns.lookup("_xmpp-server._tcp."..connect_host..".", "SRV");
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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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end
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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("debug", "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("debug", "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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-- Ok, we're going to try to connect
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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() failed: %s", err);
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end
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local cl = connlisteners_get("xmppserver");
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conn = wraptlsclient(cl, conn, connect_host, connect_port, 0, cl.default_mode or 1, hosts[from_host].ssl_ctx );
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host_session.conn = conn;
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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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local w = conn.write;
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host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end
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conn.write(format([[<stream:stream xmlns='jabber:server' xmlns:db='jabber:server:dialback' xmlns:stream='http://etherx.jabber.org/streams' from='%s' to='%s' version='1.0'>]], from_host, to_host));
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return true;
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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 = 0; --tonumber(attr.version) or 0;
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if session.version >= 1.0 and not (attr.to and attr.from) then
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--print("to: "..tostring(attr.to).." from: "..tostring(attr.from));
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log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC");
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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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--for k,v in pairs(attr) do print("", tostring(k), ":::", tostring(v)); end
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session.to_host = attr.to;
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session.from_host = 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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send("<?xml version='1.0'?>");
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send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host }):top_tag());
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if session.to_host and 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({ condition = "host-unknown"; text = "This host does not serve "..session.to_host });
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return;
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end
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if session.version >= 1.0 then
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send(st.stanza("stream:features")
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:tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up());
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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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if not session.dialback_verifying then
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initiate_dialback(session);
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else
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mark_connected(session);
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end
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end
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session.notopen = nil;
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end
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function initiate_dialback(session)
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-- generate dialback key
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session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host);
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session.sends2s(format("<db:result from='%s' to='%s'>%s</db:result>", session.from_host, session.to_host, session.dialback_key));
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session.log("info", "sent dialback key on outgoing s2s stream");
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end
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function generate_dialback(id, to, from)
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return sha256_hash(id..to..from..dialback_secret, true);
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end
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function verify_dialback(id, to, from, key)
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return key == generate_dialback(id, to, from);
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end
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function make_authenticated(session)
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if session.type == "s2sout_unauthed" then
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session.type = "s2sout";
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elseif session.type == "s2sin_unauthed" then
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session.type = "s2sin";
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else
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return false;
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end
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session.log("info", "connection is now authenticated");
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mark_connected(session);
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return true;
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end
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function mark_connected(session)
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local sendq, send = session.sendq, session.sends2s;
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local from, to = session.from_host, session.to_host;
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session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete");
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local send_to_host = send_to_host;
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function session.send(data) send_to_host(to, from, data); end
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if session.direction == "outgoing" then
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if sendq then
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session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host);
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for i, data in ipairs(sendq) do
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send(data);
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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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end
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function destroy_session(session)
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(session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host));
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-- FIXME: Flush sendq here/report errors to originators
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if session.direction == "outgoing" then
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hosts[session.from_host].s2sout[session.to_host] = nil;
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end
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for k in pairs(session) do
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if k ~= "trace" then
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session[k] = nil;
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end
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end
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end
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return _M;
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