diff options
Diffstat (limited to 'core/s2smanager.lua')
| -rw-r--r-- | core/s2smanager.lua | 598 |
1 files changed, 21 insertions, 577 deletions
diff --git a/core/s2smanager.lua b/core/s2smanager.lua index 7e6f8135..59c1831b 100644 --- a/core/s2smanager.lua +++ b/core/s2smanager.lua @@ -1,599 +1,43 @@ -- Prosody IM -- 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. -- -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, setmetatable - = tostring, pairs, ipairs, getmetatable, newproxy, error, tonumber, setmetatable; - -local idna_to_ascii = require "util.encodings".idna.to_ascii; -local connlisteners_get = require "net.connlisteners".get; -local initialize_filters = require "util.filters".initialize; -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 cert_verify_identity = require "util.x509".verify_identity; - -local fire_event = prosody.events.fire_event; -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 adns, dns = require "net.adns", require "net.dns"; -local config = require "core.configmanager"; -local connect_timeout = config.get("*", "core", "s2s_timeout") or 60; -local dns_timeout = config.get("*", "core", "dns_timeout") or 15; -local max_dns_depth = config.get("*", "core", "dns_max_depth") or 3; - -dns.settimeout(dns_timeout); - 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" -function compare_srv_priorities(a,b) - return a.priority < b.priority or (a.priority == b.priority and a.weight > b.weight); -end - -local bouncy_stanzas = { message = true, presence = true, iq = true }; -local function bounce_sendq(session, reason) - 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) and bouncy_stanzas[reply.name] then - reply.attr.type = "error"; - reply:tag("error", {type = "cancel"}) - :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up(); - if reason then - reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):text("Connection failed: "..reason):up(); - end - core_process_stanza(dummy, reply); - end - sendq[i] = nil; - end - session.sendq = nil; - end -end - -function send_to_host(from_host, to_host, data) - if not hosts[from_host] then - log("warn", "Attempt to send stanza from %s - a host we don't serve", from_host); - return false; - end - 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" or not host.dialback_key) then - (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host); - - -- 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)); - return false; - 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); - if not destroy_session(host_session, "Connection failed") then - -- Already destroyed, we need to bounce our stanza - bounce_sendq(host_session, host_session.destruction_reason); - end - return false; - end - end - return true; -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]+$")); - session.log = log; - local filter = initialize_filters(session); - session.sends2s = function (t) - log("debug", "sending: %s", t.top_tag and t:top_tag() or t:match("^([^>]*>?)")); - if t.name then - t = filter("stanzas/out", t); - end - if t then - t = filter("bytes/out", tostring(t)); - if t then - return w(conn, t); - end - end - end + session.log = logger_init("s2sin"..tostring(session):match("[a-f0-9]+$")); incoming_s2s[session] = true; - add_task(connect_timeout, function () - if session.conn ~= conn or - session.type == "s2sin" then - return; -- Ok, we're connect[ed|ing] - end - -- Not connected, need to close session and clean up - (session.log or log)("warn", "Destroying incomplete session %s->%s due to inactivity", - session.from_host or "(unknown)", session.to_host or "(unknown)"); - session:close("connection-timeout"); - end); return session; end -function new_outgoing(from_host, to_host, connect) - local host_session = { to_host = to_host, from_host = from_host, host = from_host, - notopen = true, type = "s2sout_unauthed", direction = "outgoing", - open_stream = session_open_stream }; - - hosts[from_host].s2sout[to_host] = host_session; - - host_session.close = destroy_session; -- This gets replaced by xmppserver_listener later - - local log; - do - local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); - log = logger_init(conn_name); - host_session.log = log; - end - - initialize_filters(host_session); - - if connect ~= false then - -- Kick the connection attempting machine into life - if not attempt_connection(host_session) then - -- Intentionally not returning here, the - -- session is needed, connected or not - destroy_session(host_session); - end - end - - 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; -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 = to_host and idna_to_ascii(to_host), 5269; - - if not connect_host then - return false; - end - - 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 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, err); - end - end - end, "_xmpp-server._tcp."..connect_host..".", "SRV"); - - 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.connecting = true; - local handle; - handle = adns.lookup(function (reply, err) - handle = nil; - host_session.connecting = nil; - - -- COMPAT: This is a compromise for all you CNAME-(ab)users :) - if not (reply and reply[#reply] and reply[#reply].a) then - local count = max_dns_depth; - reply = dns.peek(connect_host, "CNAME", "IN"); - while count > 0 and reply and reply[#reply] and not reply[#reply].a and reply[#reply].cname do - log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[#reply].cname), count); - reply = dns.peek(reply[#reply].cname, "A", "IN") or dns.peek(reply[#reply].cname, "CNAME", "IN"); - count = count - 1; - end - end - -- end of CNAME resolving - - if reply and reply[#reply] and reply[#reply].a then - log("debug", "DNS reply for %s gives us %s", connect_host, reply[#reply].a); - local ok, err = make_connect(host_session, reply[#reply].a, connect_port); - if not ok then - if not attempt_connection(host_session, err or "closed") then - err = err and (": "..err) or ""; - destroy_session(host_session, "Connection failed"..err); - end - end - else - log("debug", "DNS lookup failed to get a response for %s", connect_host); - if not attempt_connection(host_session, "name resolution failed") then -- Retry if we can - log("debug", "No other records to try for %s - destroying", host_session.to_host); - err = err and (": "..err) or ""; - destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't - end - end - end, connect_host, "A", "IN"); - - return true; -end - -function make_connect(host_session, connect_host, connect_port) - (host_session.log or 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(); - - if not conn then - log("warn", "Failed to create outgoing connection, system error: %s", handler); - return false, handler; - end - - 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 ); - host_session.conn = conn; - - local filter = initialize_filters(host_session); - local w, log = conn.write, host_session.log; - host_session.sends2s = function (t) - log("debug", "sending: %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?")); - if t.name then - t = filter("stanzas/out", t); - end - if t then - t = filter("bytes/out", tostring(t)); - if t then - return w(conn, tostring(t)); - end - end - end - - -- 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); - - host_session:open_stream(from_host, to_host); - - log("debug", "Connection attempt in progress..."); - add_task(connect_timeout, function () - if host_session.conn ~= conn or - host_session.type == "s2sout" or - host_session.connecting then - return; -- Ok, we're connect[ed|ing] - end - -- Not connected, need to close session and clean up - (host_session.log or log)("warn", "Destroying incomplete session %s->%s due to inactivity", - host_session.from_host or "(unknown)", host_session.to_host or "(unknown)"); - host_session:close("connection-timeout"); - end); - return true; -end - -function session_open_stream(session, from, to) - session.sends2s(st.stanza("stream:stream", { - xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', - ["xmlns:stream"]='http://etherx.jabber.org/streams', - from=from, to=to, version='1.0', ["xml:lang"]='en'}):top_tag()); -end - -local function check_cert_status(session) - local conn = session.conn:socket() - local cert - if conn.getpeercertificate then - cert = conn:getpeercertificate() - end - - if cert then - local chain_valid, err = conn:getpeerchainvalid() - if not chain_valid then - session.cert_chain_status = "invalid"; - (session.log or log)("debug", "certificate chain validation result: %s", err); - else - session.cert_chain_status = "valid"; - - local host = session.direction == "incoming" and session.from_host or session.to_host - - -- We'll go ahead and verify the asserted identity if the - -- connecting server specified one. - if host then - if cert_verify_identity(host, "xmpp-server", cert) then - session.cert_identity_status = "valid" - else - session.cert_identity_status = "invalid" - end - end - end - end -end - -function streamopened(session, attr) - local send = session.sends2s; - - -- TODO: #29: SASL/TLS on s2s streams - session.version = tonumber(attr.version) or 0; - - -- TODO: Rename session.secure to session.encrypted - if session.secure == false then - session.secure = true; - 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>"); - if session.to_host then - if 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; - elseif hosts[session.to_host].disallow_s2s then - -- Attempting to connect to a host that disallows s2s - session:close({ - condition = "policy-violation"; - text = "Server-to-server communication is not allowed to this host"; - }); - return; - end - end - - if session.secure and not session.cert_chain_status then check_cert_status(session); end - - 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, to=session.from_host, version=(session.version > 0 and "1.0" or nil) }):top_tag()); - if session.version >= 1.0 then - local features = st.stanza("stream:features"); - - if session.to_host then - hosts[session.to_host].events.fire_event("s2s-stream-features", { origin = session, features = features }); - else - (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"); - end - - log("debug", "Sending stream features: %s", tostring(features)); - send(features); - 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; - - if session.secure and not session.cert_chain_status then check_cert_status(session); end - - -- 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 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 - if not session.hosts[host] then session.hosts[host] = {}; end - session.hosts[host].authed = true; - end - elseif session.type == "s2sin" and host then - if not session.hosts[host] then session.hosts[host] = {}; end - 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) return 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 +function new_outgoing(from_host, to_host) + 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 local resting_session = { -- Resting, not dead @@ -611,7 +55,7 @@ local resting_session = { -- Resting, not dead function retire_session(session, reason) local log = session.log or log; for k in pairs(session) do - if k ~= "trace" and k ~= "log" and k ~= "id" then + if k ~= "log" and k ~= "id" and k ~= "conn" then session[k] = nil; end end @@ -625,28 +69,28 @@ 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)); - + (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, reason); + session:bounce_sendq(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); + 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); + 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 |