diff options
Diffstat (limited to 'core/s2smanager.lua')
| -rw-r--r-- | core/s2smanager.lua | 419 |
1 files changed, 53 insertions, 366 deletions
diff --git a/core/s2smanager.lua b/core/s2smanager.lua index 0589e024..06d3f2c9 100644 --- a/core/s2smanager.lua +++ b/core/s2smanager.lua @@ -1,6 +1,6 @@ -- Prosody IM --- Copyright (C) 2008-2009 Matthew Wild --- Copyright (C) 2008-2009 Waqas Hussain +-- Copyright (C) 2008-2010 Matthew Wild +-- Copyright (C) 2008-2010 Waqas Hussain -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. @@ -8,404 +8,91 @@ -local hosts = hosts; -local sessions = sessions; -local core_process_stanza = function(a, b) core_process_stanza(a, b); end -local add_task = require "util.timer".add_task; -local socket = require "socket"; -local format = string.format; -local t_insert, t_sort = table.insert, table.sort; -local get_traceback = debug.traceback; -local tostring, pairs, ipairs, getmetatable, newproxy, error, tonumber - = tostring, pairs, ipairs, getmetatable, newproxy, error, tonumber; - -local idna_to_ascii = require "util.encodings".idna.to_ascii; -local connlisteners_get = require "net.connlisteners".get; -local wrapclient = require "net.server".wrapclient; -local modulemanager = require "core.modulemanager"; -local st = require "stanza"; -local stanza = st.stanza; -local nameprep = require "util.encodings".stringprep.nameprep; - -local uuid_gen = require "util.uuid".generate; +local hosts = prosody.hosts; +local tostring, pairs, setmetatable + = tostring, pairs, setmetatable; local logger_init = require "util.logger".init; local log = logger_init("s2smanager"); -local sha256_hash = require "util.hashes".sha256; - -local dialback_secret = uuid_gen(); - -local adns = require "net.adns"; - -local dns_timeout = config.get("*", "core", "dns_timeout") or 60; - +local prosody = _G.prosody; incoming_s2s = {}; +prosody.incoming_s2s = incoming_s2s; local incoming_s2s = incoming_s2s; +local fire_event = prosody.events.fire_event; module "s2smanager" -local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end - -local function bounce_sendq(session) - local sendq = session.sendq; - if sendq then - session.log("info", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host)); - local dummy = { - type = "s2sin"; - send = function(s) - (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", get_traceback()); - end; - dummy = true; - }; - for i, data in ipairs(sendq) do - local reply = data[2]; - local xmlns = reply.attr.xmlns; - if not xmlns or xmlns == "jabber:client" or xmlns == "jabber:server" then - reply.attr.type = "error"; - reply:tag("error", {type = "cancel"}) - :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up(); - core_process_stanza(dummy, reply); - end - sendq[i] = nil; - end - session.sendq = nil; - end -end - -function send_to_host(from_host, to_host, data) - local host = hosts[from_host].s2sout[to_host]; - if host then - -- We have a connection to this host already - 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 - (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host); - if not host.notopen and not host.dialback_key and host.sends2s then - host.log("debug", "dialback had not been initiated"); - initiate_dialback(host); - end - - -- Queue stanza until we are able to send it - if host.sendq then t_insert(host.sendq, {tostring(data), st.reply(data)}); - else host.sendq = { {tostring(data), st.reply(data)} }; end - host.log("debug", "stanza [%s] queued ", data.name); - elseif host.type == "local" or host.type == "component" then - log("error", "Trying to send a stanza to ourselves??") - log("error", "Traceback: %s", get_traceback()); - log("error", "Stanza: %s", tostring(data)); - else - (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host); - -- FIXME - if host.from_host ~= from_host then - log("error", "WARNING! This might, possibly, be a bug, but it might not..."); - log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host)); - end - host.sends2s(data); - host.log("debug", "stanza sent over "..host.type); - end - else - log("debug", "opening a new outgoing connection for this stanza"); - local host_session = new_outgoing(from_host, to_host); - -- Store in buffer - host_session.sendq = { {tostring(data), st.reply(data)} }; - log("debug", "stanza [%s] queued until connection complete", tostring(data.name)); - if (not host_session.connecting) and (not host_session.conn) then - log("warn", "Connection to %s failed already, destroying session...", to_host); - destroy_session(host_session); - end - end -end - -local open_sessions = 0; - function new_incoming(conn) local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming", hosts = {} }; - if true then - session.trace = newproxy(true); - getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end; - end - open_sessions = open_sessions + 1; - local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$")); - session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end + session.log = logger_init("s2sin"..tostring(session):match("[a-f0-9]+$")); incoming_s2s[session] = true; return session; end function new_outgoing(from_host, to_host) - local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; - hosts[from_host].s2sout[to_host] = host_session; - - local log; - do - local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); - log = logger_init(conn_name); - host_session.log = log; - end - - -- This is the first call, can't fail (the first step is DNS lookup) - attempt_connection(host_session); - - if not host_session.sends2s then - -- A sends2s which buffers data (until the stream is opened) - -- note that data in this buffer will be sent before the stream is authed - -- and will not be ack'd in any way, successful or otherwise - local buffer; - function host_session.sends2s(data) - if not buffer then - buffer = {}; - host_session.send_buffer = buffer; - end - log("debug", "Buffering data on unconnected s2sout to %s", to_host); - buffer[#buffer+1] = data; - log("debug", "Buffered item %d: %s", #buffer, tostring(data)); - end - - end - - return host_session; + local host_session = { to_host = to_host, from_host = from_host, host = from_host, + notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; + hosts[from_host].s2sout[to_host] = host_session; + local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); + host_session.log = logger_init(conn_name); + return host_session; end - -function attempt_connection(host_session, err) - local from_host, to_host = host_session.from_host, host_session.to_host; - local connect_host, connect_port = idna_to_ascii(to_host), 5269; - - if not err then -- This is our first attempt - log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host); - host_session.connecting = true; - local answer, handle; - handle = adns.lookup(function (answer) - handle = nil; - host_session.connecting = nil; - if answer then - log("debug", to_host.." has SRV records, handling..."); - local srv_hosts = {}; - host_session.srv_hosts = srv_hosts; - for _, record in ipairs(answer) do - t_insert(srv_hosts, record.srv); - end - t_sort(srv_hosts, compare_srv_priorities); - - local srv_choice = srv_hosts[1]; - host_session.srv_choice = 1; - if srv_choice then - connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; - log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); - end - else - log("debug", to_host.." has no SRV records, falling back to A"); - end - -- Try with SRV, or just the plain hostname if no SRV - local ok, err = try_connect(host_session, connect_host, connect_port); - if not ok then - if not attempt_connection(host_session, err) then - -- No more attempts will be made - destroy_session(host_session); - end - end - end, "_xmpp-server._tcp."..connect_host..".", "SRV"); - - -- Set handler for DNS timeout - add_task(dns_timeout, function () - if handle then - adns.cancel(handle, true); - end - end); - - log("debug", "DNS lookup for %s sent, waiting for response before we can connect", to_host); - return true; -- Attempt in progress - elseif host_session.srv_hosts and #host_session.srv_hosts > host_session.srv_choice then -- Not our first attempt, and we also have SRV - host_session.srv_choice = host_session.srv_choice + 1; - local srv_choice = host_session.srv_hosts[host_session.srv_choice]; - connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; - host_session.log("info", "Connection failed (%s). Attempt #%d: This time to %s:%d", tostring(err), host_session.srv_choice, connect_host, connect_port); - else - host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); - -- We're out of options - return false; - end - - if not (connect_host and connect_port) then - -- Likely we couldn't resolve DNS - 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)); - return false; - end - - return try_connect(host_session, connect_host, connect_port); -end - -function try_connect(host_session, connect_host, connect_port) - host_session.log("info", "Beginning new connection attempt to %s (%s:%d)", host_session.to_host, connect_host, connect_port); - -- Ok, we're going to try to connect - - local from_host, to_host = host_session.from_host, host_session.to_host; - - local conn, handler = socket.tcp() - - conn:settimeout(0); - local success, err = conn:connect(connect_host, connect_port); - if not success and err ~= "timeout" then - log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host, connect_port, err); - return false, err; - end - - local cl = connlisteners_get("xmppserver"); - conn = wrapclient(conn, connect_host, connect_port, cl, cl.default_mode or 1, hosts[from_host].ssl_ctx, false ); - host_session.conn = conn; - - -- Register this outgoing connection so that xmppserver_listener knows about it - -- otherwise it will assume it is a new incoming connection - cl.register_outgoing(conn, host_session); - - local w = conn.write; - host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end - - 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' xml:lang='en'>]], from_host, to_host)); - log("debug", "Connection attempt in progress..."); - return true; -end - -function streamopened(session, attr) - local send = session.sends2s; - - -- TODO: #29: SASL/TLS on s2s streams - session.version = 0; --tonumber(attr.version) or 0; - - if session.version >= 1.0 and not (attr.to and attr.from) then - log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); - end - - if session.direction == "incoming" then - -- Send a reply stream header - session.to_host = attr.to and nameprep(attr.to); - session.from_host = attr.from and nameprep(attr.from); - - session.streamid = uuid_gen(); - (session.log or log)("debug", "incoming s2s received <stream:stream>"); - send("<?xml version='1.0'?>"); - 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()); - if session.to_host and not hosts[session.to_host] then - -- Attempting to connect to a host we don't serve - session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); - return; - end - if session.version >= 1.0 then - send(st.stanza("stream:features") - :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); - end - elseif session.direction == "outgoing" then - -- If we are just using the connection for verifying dialback keys, we won't try and auth it - if not attr.id then error("stream response did not give us a streamid!!!"); end - session.streamid = attr.id; - - -- Send unauthed buffer - -- (stanzas which are fine to send before dialback) - -- Note that this is *not* the stanza queue (which - -- we can only send if auth succeeds) :) - local send_buffer = session.send_buffer; - if send_buffer and #send_buffer > 0 then - log("debug", "Sending s2s send_buffer now..."); - for i, data in ipairs(send_buffer) do - session.sends2s(tostring(data)); - send_buffer[i] = nil; - end - end - session.send_buffer = nil; - - if not session.dialback_verifying then - initiate_dialback(session); - else - mark_connected(session); +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, reason) + local log = session.log or log; + for k in pairs(session) do + if k ~= "log" and k ~= "id" and k ~= "conn" then + session[k] = nil; end end - session.notopen = nil; -end - -function streamclosed(session) - (session.log or log)("debug", "</stream:stream>"); - if session.sends2s then - session.sends2s("</stream:stream>"); - end - session.notopen = true; -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..dialback_secret, true); -end + session.destruction_reason = reason; -function verify_dialback(id, to, from, key) - return key == generate_dialback(id, to, from); + 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 make_authenticated(session, host) - 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 - -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 - - - 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 - -function destroy_session(session) - (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); +function destroy_session(session, reason) + if session.destroyed then return; end + (session.log or log)("debug", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)..(reason and (": "..reason) or "")); if session.direction == "outgoing" then hosts[session.from_host].s2sout[session.to_host] = nil; - bounce_sendq(session); + session:bounce_sendq(reason); elseif session.direction == "incoming" then incoming_s2s[session] = nil; end - for k in pairs(session) do - if k ~= "trace" then - session[k] = nil; + local event_data = { session = session, reason = reason }; + if session.type == "s2sout" then + 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 + 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, reason); -- Clean session until it is GC'd + return true; end return _M; |