diff options
Diffstat (limited to 'plugins/mod_s2s')
| -rw-r--r-- | plugins/mod_s2s/mod_s2s.lua | 749 | ||||
| -rw-r--r-- | plugins/mod_s2s/s2sout.lib.lua | 349 |
2 files changed, 0 insertions, 1098 deletions
diff --git a/plugins/mod_s2s/mod_s2s.lua b/plugins/mod_s2s/mod_s2s.lua deleted file mode 100644 index 8e398f56..00000000 --- a/plugins/mod_s2s/mod_s2s.lua +++ /dev/null @@ -1,749 +0,0 @@ --- 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. --- - -module:set_global(); - -local prosody = prosody; -local hosts = prosody.hosts; -local core_process_stanza = prosody.core_process_stanza; - -local tostring, type = tostring, type; -local t_insert = table.insert; -local traceback = debug.traceback; - -local add_task = require "util.timer".add_task; -local st = require "util.stanza"; -local initialize_filters = require "util.filters".initialize; -local nameprep = require "util.encodings".stringprep.nameprep; -local new_xmpp_stream = require "util.xmppstream".new; -local s2s_new_incoming = require "core.s2smanager".new_incoming; -local s2s_new_outgoing = require "core.s2smanager".new_outgoing; -local s2s_destroy_session = require "core.s2smanager".destroy_session; -local uuid_gen = require "util.uuid".generate; -local fire_global_event = prosody.events.fire_event; -local runner = require "util.async".runner; - -local s2sout = module:require("s2sout"); - -local connect_timeout = module:get_option_number("s2s_timeout", 90); -local stream_close_timeout = module:get_option_number("s2s_close_timeout", 5); -local opt_keepalives = module:get_option_boolean("s2s_tcp_keepalives", module:get_option_boolean("tcp_keepalives", true)); -local secure_auth = module:get_option_boolean("s2s_secure_auth", false); -- One day... -local secure_domains, insecure_domains = - module:get_option_set("s2s_secure_domains", {})._items, module:get_option_set("s2s_insecure_domains", {})._items; -local require_encryption = module:get_option_boolean("s2s_require_encryption", false); -local stanza_size_limit = module:get_option_number("s2s_stanza_size_limit"); -- TODO come up with a sensible default (util.xmppstream defaults to 10M) - -local measure_connections = module:measure("connections", "amount"); -local measure_ipv6 = module:measure("ipv6", "amount"); - -local sessions = module:shared("sessions"); - -local runner_callbacks = {}; - -local log = module._log; - -module:hook("stats-update", function () - local count = 0; - local ipv6 = 0; - for _, session in pairs(sessions) do - count = count + 1; - if session.ip and session.ip:match(":") then - ipv6 = ipv6 + 1; - end - end - measure_connections(count); - measure_ipv6(ipv6); -end); - ---- Handle stanzas to remote domains - -local bouncy_stanzas = { message = true, presence = true, iq = true }; -local function bounce_sendq(session, reason) - local sendq = session.sendq; - if not sendq then return; end - session.log("info", "Sending error replies for %d queued stanzas because of failed outgoing connection to %s", #sendq, session.to_host); - local dummy = { - type = "s2sin"; - send = function () - (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", traceback()); - end; - dummy = true; - close = function () - (session.log or log)("error", "Attempting to close the dummy origin of s2s error replies, please report this! Traceback: %s", traceback()); - end; - }; - for i, data in ipairs(sendq) do - local reply = data[2]; - if reply and not(reply.attr.xmlns) and bouncy_stanzas[reply.name] then - reply.attr.type = "error"; - reply:tag("error", {type = "cancel", by = session.from_host}) - :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("Server-to-server connection failed: "..reason):up(); - end - core_process_stanza(dummy, reply); - end - sendq[i] = nil; - end - session.sendq = nil; -end - --- Handles stanzas to existing s2s sessions -function route_to_existing_session(event) - local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza; - 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 - if hosts[to_host] then - log("warn", "Attempt to route stanza to a remote %s - a host we do 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 (stanza.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 - local queued_item = { - tostring(stanza), - stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza); - }; - if host.sendq then - t_insert(host.sendq, queued_item); - else - -- luacheck: ignore 122 - host.sendq = { queued_item }; - end - host.log("debug", "stanza [%s] queued ", stanza.name); - return true; - elseif host.type == "local" or host.type == "component" then - log("error", "Trying to send a stanza to ourselves??") - log("error", "Traceback: %s", traceback()); - log("error", "Stanza: %s", tostring(stanza)); - return false; - else - -- 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", host.from_host, from_host); - end - if host.sends2s(stanza) then - return true; - end - end - end -end - --- Create a new outgoing session for a stanza -function route_to_new_session(event) - local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza; - log("debug", "opening a new outgoing connection for this stanza"); - local host_session = s2s_new_outgoing(from_host, to_host); - - -- Store in buffer - host_session.bounce_sendq = bounce_sendq; - host_session.sendq = { {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)} }; - log("debug", "stanza [%s] queued until connection complete", tostring(stanza.name)); - s2sout.initiate_connection(host_session); - if (not host_session.connecting) and (not host_session.conn) then - log("warn", "Connection to %s failed already, destroying session...", to_host); - s2s_destroy_session(host_session, "Connection failed"); - return false; - end - return true; -end - -local function keepalive(event) - local session = event.session; - if not session.notopen then - return event.session.sends2s(' '); - end -end - -module:hook("s2s-read-timeout", keepalive, -1); - -function module.add_host(module) - if module:get_option_boolean("disallow_s2s", false) then - module:log("warn", "The 'disallow_s2s' config option is deprecated, please see https://prosody.im/doc/s2s#disabling"); - return nil, "This host has disallow_s2s set"; - end - module:hook("route/remote", route_to_existing_session, -1); - module:hook("route/remote", route_to_new_session, -10); - module:hook("s2s-authenticated", make_authenticated, -1); - module:hook("s2s-read-timeout", keepalive, -1); - module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza) -- luacheck: ignore 212/stanza - if session.type == "s2sout" then - -- Stream is authenticated and we are seem to be done with feature negotiation, - -- so the stream is ready for stanzas. RFC 6120 Section 4.3 - mark_connected(session); - return true; - elseif not session.dialback_verifying then - session.log("warn", "No SASL EXTERNAL offer and Dialback doesn't seem to be enabled, giving up"); - session:close(); - return false; - end - end, -1); -end - --- Stream is authorised, and ready for normal stanzas -function mark_connected(session) - - local sendq = session.sendq; - - local from, to = session.from_host, session.to_host; - - session.log("info", "%s s2s connection %s->%s complete", session.direction:gsub("^.", string.upper), from, to); - - local event_data = { session = session }; - if session.type == "s2sout" then - fire_global_event("s2sout-established", event_data); - hosts[from].events.fire_event("s2sout-established", event_data); - else - local host_session = hosts[to]; - session.send = function(stanza) - return host_session.events.fire_event("route/remote", { from_host = to, to_host = from, stanza = stanza }); - end; - - fire_global_event("s2sin-established", event_data); - hosts[to].events.fire_event("s2sin-established", event_data); - end - - if session.direction == "outgoing" then - if sendq then - session.log("debug", "sending %d queued stanzas across new outgoing connection to %s", #sendq, session.to_host); - local send = session.sends2s; - for i, data in ipairs(sendq) do - send(data[1]); - sendq[i] = nil; - end - session.sendq = nil; - end - - if session.resolver then - session.resolver._resolver:closeall() - end - session.resolver = nil; - session.ip_hosts = nil; - session.srv_hosts = nil; - end -end - -function make_authenticated(event) - local session, host = event.session, event.host; - if not session.secure then - if require_encryption or (secure_auth and not(insecure_domains[host])) or secure_domains[host] 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 hosts[host] then - session:close({ condition = "undefined-condition", text = "Attempt to authenticate as a host we serve" }); - 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 for %s", session.from_host, session.to_host, host); - - if (session.type == "s2sout" and session.external_auth ~= "succeeded") or session.type == "s2sin" then - -- Stream either used dialback for authentication or is an incoming stream. - mark_connected(session); - end - - return true; -end - ---- Helper to check that a session peer's certificate is valid -function check_cert_status(session) - local host = session.direction == "outgoing" and session.to_host or session.from_host - local conn = session.conn:socket() - local cert - if conn.getpeercertificate then - cert = conn:getpeercertificate() - end - - return module:fire_event("s2s-check-certificate", { host = host, session = session, cert = cert }); -end - ---- XMPP stream event handlers - -local stream_callbacks = { default_ns = "jabber:server" }; - -function stream_callbacks.handlestanza(session, stanza) - stanza = session.filter("stanzas/in", stanza); - session.thread:run(stanza); -end - -local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams"; - -function stream_callbacks.streamopened(session, attr) - -- run _streamopened in async context - session.thread:run({ attr = attr }); -end - -function stream_callbacks._streamopened(session, attr) - session.version = tonumber(attr.version) or 0; - - -- TODO: Rename session.secure to session.encrypted - if session.secure == false then - session.secure = true; - session.encrypted = true; - - local sock = session.conn:socket(); - if sock.info then - local info = sock:info(); - (session.log or log)("info", "Stream encrypted (%s with %s)", info.protocol, info.cipher); - session.compressed = info.compression; - else - (session.log or log)("info", "Stream encrypted"); - session.compressed = sock.compression and sock:compression(); --COMPAT mw/luasec-hg - end - end - - if session.direction == "incoming" then - -- Send a reply stream header - - -- Validate to/from - local to, from = nameprep(attr.to), nameprep(attr.from); - if not to and attr.to then -- COMPAT: Some servers do not reliably set 'to' (especially on stream restarts) - session:close({ condition = "improper-addressing", text = "Invalid 'to' address" }); - return; - end - if not from and attr.from then -- COMPAT: Some servers do not reliably set 'from' (especially on stream restarts) - session:close({ condition = "improper-addressing", text = "Invalid 'from' address" }); - return; - end - - -- Set session.[from/to]_host if they have not been set already and if - -- this session isn't already authenticated - if session.type == "s2sin_unauthed" and from and not session.from_host then - session.from_host = from; - elseif from ~= session.from_host then - session:close({ condition = "improper-addressing", text = "New stream 'from' attribute does not match original" }); - return; - end - if session.type == "s2sin_unauthed" and to and not session.to_host then - session.to_host = to; - elseif to ~= session.to_host then - session:close({ condition = "improper-addressing", text = "New stream 'to' attribute does not match original" }); - return; - end - - -- For convenience we'll put the sanitised values into these variables - to, from = session.to_host, session.from_host; - - session.streamid = uuid_gen(); - (session.log or log)("debug", "Incoming s2s received %s", st.stanza("stream:stream", attr):top_tag()); - if to then - if not hosts[to] then - -- Attempting to connect to a host we don't serve - session:close({ - condition = "host-unknown"; - text = "This host does not serve "..to - }); - return; - elseif not hosts[to].modules.s2s then - -- Attempting to connect to a host that disallows s2s - session:close({ - condition = "policy-violation"; - text = "Server-to-server communication is disabled for this host"; - }); - return; - end - end - - if hosts[from] then - session:close({ condition = "undefined-condition", text = "Attempt to connect from a host we serve" }); - return; - end - - if session.secure and not session.cert_chain_status then - if check_cert_status(session) == false then - return; - end - end - - session:open_stream(session.to_host, session.from_host) - session.notopen = nil; - if session.version >= 1.0 then - local features = st.stanza("stream:features"); - - if to then - hosts[to].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", from or session.ip or "unknown host"); - fire_global_event("s2s-stream-features-legacy", { origin = session, features = features }); - end - - if ( session.type == "s2sin" or session.type == "s2sout" ) or features.tags[1] then - log("debug", "Sending stream features: %s", features); - session.sends2s(features); - else - (session.log or log)("warn", "No stream features to offer, giving up"); - session:close({ condition = "undefined-condition", text = "No stream features to offer" }); - end - end - elseif session.direction == "outgoing" then - session.notopen = nil; - if not attr.id then - log("warn", "Stream response did not give us a stream id!"); - session:close({ condition = "undefined-condition", text = "Missing stream ID" }); - return; - end - session.streamid = attr.id; - - if session.secure and not session.cert_chain_status then - if check_cert_status(session) == false then - return; - end - 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 - hosts[session.from_host].events.fire_event("s2sout-authenticate-legacy", { origin = session }); - else - mark_connected(session); - end - end - end -end - -function stream_callbacks.streamclosed(session) - (session.log or log)("debug", "Received </stream:stream>"); - session:close(false); -end - -function stream_callbacks.error(session, error, data) - if error == "no-stream" then - session.log("debug", "Invalid opening stream header (%s)", (data:gsub("^([^\1]+)\1", "{%1}"))); - session:close("invalid-namespace"); - elseif error == "parse-error" then - session.log("debug", "Server-to-server XML parse error: %s", error); - session:close("not-well-formed"); - elseif error == "stream-error" then - local condition, text = "undefined-condition"; - for child in data:childtags(nil, xmlns_xmpp_streams) do - if child.name ~= "text" then - condition = child.name; - else - text = child:get_text(); - end - if condition ~= "undefined-condition" and text then - break; - end - end - text = condition .. (text and (" ("..text..")") or ""); - session.log("info", "Session closed by remote with error: %s", text); - session:close(nil, text); - end -end - -local listener = {}; - ---- Session methods -local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'}; -local function session_close(session, reason, remote_reason) - local log = session.log or log; - if session.conn then - if session.notopen then - if session.direction == "incoming" then - session:open_stream(session.to_host, session.from_host); - else - session:open_stream(session.from_host, session.to_host); - end - end - if reason then -- nil == no err, initiated by us, false == initiated by remote - if type(reason) == "string" then -- assume stream error - log("debug", "Disconnecting %s[%s], <stream:error> is: %s", session.host or session.ip or "(unknown host)", session.type, reason); - session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' })); - elseif type(reason) == "table" then - if reason.condition then - local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up(); - if reason.text then - stanza:tag("text", stream_xmlns_attr):text(reason.text):up(); - end - if reason.extra then - stanza:add_child(reason.extra); - end - log("debug", "Disconnecting %s[%s], <stream:error> is: %s", - session.host or session.ip or "(unknown host)", session.type, stanza); - session.sends2s(stanza); - elseif reason.name then -- a stanza - log("debug", "Disconnecting %s->%s[%s], <stream:error> is: %s", - session.from_host or "(unknown host)", session.to_host or "(unknown host)", - session.type, reason); - session.sends2s(reason); - end - end - end - - session.sends2s("</stream:stream>"); - function session.sends2s() return false; end - - -- luacheck: ignore 422/reason - -- FIXME reason should be managed in a place common to c2s, s2s, bosh, component etc - local reason = remote_reason or (reason and (reason.text or reason.condition)) or reason; - session.log("info", "%s s2s stream %s->%s closed: %s", session.direction:gsub("^.", string.upper), - session.from_host or "(unknown host)", session.to_host or "(unknown host)", reason or "stream closed"); - - -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote - local conn = session.conn; - if reason == nil and not session.notopen and session.type == "s2sin" then - add_task(stream_close_timeout, function () - if not session.destroyed then - session.log("warn", "Failed to receive a stream close response, closing connection anyway..."); - s2s_destroy_session(session, reason); - conn:close(); - end - end); - else - s2s_destroy_session(session, reason); - conn:close(); -- Close immediately, as this is an outgoing connection or is not authed - end - end -end - -function session_stream_attrs(session, from, to, attr) -- luacheck: ignore 212/session - if not from or (hosts[from] and hosts[from].modules.dialback) then - attr["xmlns:db"] = 'jabber:server:dialback'; - end - if not from then - attr.from = ''; - end - if not to then - attr.to = ''; - end -end - --- Session initialization logic shared by incoming and outgoing -local function initialize_session(session) - local stream = new_xmpp_stream(session, stream_callbacks, stanza_size_limit); - - session.thread = runner(function (stanza) - if stanza.name == nil then - stream_callbacks._streamopened(session, stanza.attr); - else - core_process_stanza(session, stanza); - end - end, runner_callbacks, session); - - local log = session.log or log; - session.stream = stream; - - session.notopen = true; - - function session.reset_stream() - session.notopen = true; - session.streamid = nil; - session.stream:reset(); - end - - session.stream_attrs = session_stream_attrs; - - local filter = initialize_filters(session); - local conn = session.conn; - local w = conn.write; - - function session.sends2s(t) - log("debug", "Sending[%s]: %s", session.type, 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 - - function session.data(data) - data = filter("bytes/in", data); - if data then - local ok, err = stream:feed(data); - if ok then return; end - log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_")); - session:close("not-well-formed"); - end - end - - session.close = session_close; - - local handlestanza = stream_callbacks.handlestanza; - function session.dispatch_stanza(session, stanza) -- luacheck: ignore 432/session - return handlestanza(session, stanza); - end - - module:fire_event("s2s-created", { session = session }); - - add_task(connect_timeout, function () - if session.type == "s2sin" or session.type == "s2sout" then - return; -- Ok, we're connected - elseif session.type == "s2s_destroyed" then - return; -- Session already destroyed - end - -- Not connected, need to close session and clean up - (session.log or log)("debug", "Destroying incomplete session %s->%s due to inactivity", - session.from_host or "(unknown)", session.to_host or "(unknown)"); - session:close("connection-timeout"); - end); -end - -function runner_callbacks:ready() - self.data.log("debug", "Runner %s ready (%s)", self.thread, coroutine.status(self.thread)); - self.data.conn:resume(); -end - -function runner_callbacks:waiting() - self.data.log("debug", "Runner %s waiting (%s)", self.thread, coroutine.status(self.thread)); - self.data.conn:pause(); -end - -function runner_callbacks:error(err) - (self.data.log or log)("error", "Traceback[s2s]: %s", err); -end - -function listener.onconnect(conn) - conn:setoption("keepalive", opt_keepalives); - local session = sessions[conn]; - if not session then -- New incoming connection - session = s2s_new_incoming(conn); - sessions[conn] = session; - session.log("debug", "Incoming s2s connection"); - initialize_session(session); - else -- Outgoing session connected - session:open_stream(session.from_host, session.to_host); - end - session.ip = conn:ip(); -end - -function listener.onincoming(conn, data) - local session = sessions[conn]; - if session then - session.data(data); - end -end - -function listener.onstatus(conn, status) - if status == "ssl-handshake-complete" then - local session = sessions[conn]; - if session and session.direction == "outgoing" then - session.log("debug", "Sending stream header..."); - session:open_stream(session.from_host, session.to_host); - end - end -end - -function listener.ondisconnect(conn, err) - local session = sessions[conn]; - if session then - sessions[conn] = nil; - if err and session.direction == "outgoing" and session.notopen then - (session.log or log)("debug", "s2s connection attempt failed: %s", err); - if s2sout.attempt_connection(session, err) then - return; -- Session lives for now - end - end - (session.log or log)("debug", "s2s disconnected: %s->%s (%s)", session.from_host, session.to_host, err or "connection closed"); - s2s_destroy_session(session, err); - end -end - -function listener.onreadtimeout(conn) - local session = sessions[conn]; - if session then - local host = session.host or session.to_host; - return (hosts[host] or prosody).events.fire_event("s2s-read-timeout", { session = session }); - end -end - -function listener.register_outgoing(conn, session) - sessions[conn] = session; - initialize_session(session); -end - -function listener.ondetach(conn) - sessions[conn] = nil; -end - -function check_auth_policy(event) - local host, session = event.host, event.session; - local must_secure = secure_auth; - - if not must_secure and secure_domains[host] then - must_secure = true; - elseif must_secure and insecure_domains[host] then - must_secure = false; - end - - if must_secure and (session.cert_chain_status ~= "valid" or session.cert_identity_status ~= "valid") then - module:log("warn", "Forbidding insecure connection to/from %s", host or session.ip or "(unknown host)"); - if session.direction == "incoming" then - session:close({ condition = "not-authorized", text = "Your server's certificate is invalid, expired, or not trusted by "..session.to_host }); - else -- Close outgoing connections without warning - session:close(false); - end - return false; - end -end - -module:hook("s2s-check-certificate", check_auth_policy, -1); - -s2sout.set_listener(listener); - -module:hook("server-stopping", function(event) - local reason = event.reason; - for _, session in pairs(sessions) do - session:close{ condition = "system-shutdown", text = reason }; - end -end, -200); - - - -module:provides("net", { - name = "s2s"; - listener = listener; - default_port = 5269; - encryption = "starttls"; - multiplex = { - pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:server%1.*>"; - }; -}); - diff --git a/plugins/mod_s2s/s2sout.lib.lua b/plugins/mod_s2s/s2sout.lib.lua deleted file mode 100644 index 5f765da8..00000000 --- a/plugins/mod_s2s/s2sout.lib.lua +++ /dev/null @@ -1,349 +0,0 @@ --- 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. --- - ---- Module containing all the logic for connecting to a remote server - --- luacheck: ignore 432/err - -local portmanager = require "core.portmanager"; -local wrapclient = require "net.server".wrapclient; -local initialize_filters = require "util.filters".initialize; -local idna_to_ascii = require "util.encodings".idna.to_ascii; -local new_ip = require "util.ip".new_ip; -local rfc6724_dest = require "util.rfc6724".destination; -local socket = require "socket"; -local adns = require "net.adns"; -local t_insert, t_sort, ipairs = table.insert, table.sort, ipairs; -local local_addresses = require "util.net".local_addresses; - -local s2s_destroy_session = require "core.s2smanager".destroy_session; - -local default_mode = module:get_option("network_default_read_size", 4096); - -local log = module._log; - -local sources = {}; -local has_ipv4, has_ipv6; - -local dns_timeout = module:get_option_number("dns_timeout", 15); -local resolvers = module:get_option_set("s2s_dns_resolvers") - -local s2sout = {}; - -local s2s_listener; - - -function s2sout.set_listener(listener) - s2s_listener = listener; -end - -local function compare_srv_priorities(a,b) - return a.priority < b.priority or (a.priority == b.priority and a.weight > b.weight); -end - -function s2sout.initiate_connection(host_session) - local log = host_session.log or log; - - initialize_filters(host_session); - host_session.version = 1; - - host_session.resolver = adns.resolver(); - host_session.resolver._resolver:settimeout(dns_timeout); - if resolvers then - for resolver in resolvers do - host_session.resolver._resolver:addnameserver(resolver); - end - end - - -- Kick the connection attempting machine into life - if not s2sout.attempt_connection(host_session) then - -- Intentionally not returning here, the - -- session is needed, connected or not - s2s_destroy_session(host_session); - 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", host_session.to_host); - buffer[#buffer+1] = data; - log("debug", "Buffered item %d: %s", #buffer, data); - end - end -end - -function s2sout.attempt_connection(host_session, err) - local to_host = host_session.to_host; - local connect_host, connect_port = to_host and idna_to_ascii(to_host), 5269; - local log = host_session.log or log; - - 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; - host_session.resolver:lookup(function (answer) - local srv_hosts = { answer = answer }; - host_session.srv_hosts = srv_hosts; - host_session.srv_choice = 0; - host_session.connecting = nil; - if answer and #answer > 0 then - log("debug", "%s has SRV records, handling...", to_host); - for _, record in ipairs(answer) do - t_insert(srv_hosts, record.srv); - end - if #srv_hosts == 1 and srv_hosts[1].target == "." then - log("debug", "%s does not provide a XMPP service", to_host); - s2s_destroy_session(host_session, err); -- Nothing to see here - return; - 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", "%s has no SRV records, falling back to A/AAAA", to_host); - end - -- Try with SRV, or just the plain hostname if no SRV - local ok, err = s2sout.try_connect(host_session, connect_host, connect_port); - if not ok then - if not s2sout.attempt_connection(host_session, err) then - -- No more attempts will be made - s2s_destroy_session(host_session, err); - end - end - end, "_xmpp-server._tcp."..connect_host..".", "SRV"); - - return true; -- Attempt in progress - elseif host_session.ip_hosts then - return s2sout.try_connect(host_session, connect_host, connect_port, err); - 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", err, host_session.srv_choice, connect_host, connect_port); - else - host_session.log("info", "Failed in all attempts to connect to %s", 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 :(", connect_host, connect_port, to_host); - return false; - end - - return s2sout.try_connect(host_session, connect_host, connect_port); -end - -function s2sout.try_next_ip(host_session) - host_session.connecting = nil; - host_session.ip_choice = host_session.ip_choice + 1; - local ip = host_session.ip_hosts[host_session.ip_choice]; - local ok, err= s2sout.make_connect(host_session, ip.ip, ip.port); - if not ok then - if not s2sout.attempt_connection(host_session, err or "closed") then - err = err and (": "..err) or ""; - s2s_destroy_session(host_session, "Connection failed"..err); - end - end -end - -function s2sout.try_connect(host_session, connect_host, connect_port, err) - host_session.connecting = true; - local log = host_session.log or log; - - if not err then - local IPs = {}; - host_session.ip_hosts = IPs; - -- luacheck: ignore 231/handle4 231/handle6 - local handle4, handle6; - local have_other_result = not(has_ipv4) or not(has_ipv6) or false; - - if has_ipv4 then - handle4 = host_session.resolver:lookup(function (reply, err) - handle4 = nil; - - if reply and reply[#reply] and reply[#reply].a then - for _, ip in ipairs(reply) do - log("debug", "DNS reply for %s gives us %s", connect_host, ip.a); - IPs[#IPs+1] = new_ip(ip.a, "IPv4"); - end - elseif err then - log("debug", "Error in DNS lookup: %s", err); - end - - if have_other_result then - if #IPs > 0 then - rfc6724_dest(host_session.ip_hosts, sources); - for i = 1, #IPs do - IPs[i] = {ip = IPs[i], port = connect_port}; - end - host_session.ip_choice = 0; - s2sout.try_next_ip(host_session); - else - log("debug", "DNS lookup failed to get a response for %s", connect_host); - host_session.ip_hosts = nil; - if not s2sout.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 ""; - s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't - end - end - else - have_other_result = true; - end - end, connect_host, "A", "IN"); - else - have_other_result = true; - end - - if has_ipv6 then - handle6 = host_session.resolver:lookup(function (reply, err) - handle6 = nil; - - if reply and reply[#reply] and reply[#reply].aaaa then - for _, ip in ipairs(reply) do - log("debug", "DNS reply for %s gives us %s", connect_host, ip.aaaa); - IPs[#IPs+1] = new_ip(ip.aaaa, "IPv6"); - end - elseif err then - log("debug", "Error in DNS lookup: %s", err); - end - - if have_other_result then - if #IPs > 0 then - rfc6724_dest(host_session.ip_hosts, sources); - for i = 1, #IPs do - IPs[i] = {ip = IPs[i], port = connect_port}; - end - host_session.ip_choice = 0; - s2sout.try_next_ip(host_session); - else - log("debug", "DNS lookup failed to get a response for %s", connect_host); - host_session.ip_hosts = nil; - if not s2sout.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 ""; - s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't - end - end - else - have_other_result = true; - end - end, connect_host, "AAAA", "IN"); - else - have_other_result = true; - end - return true; - elseif host_session.ip_hosts and #host_session.ip_hosts > host_session.ip_choice then -- Not our first attempt, and we also have IPs left to try - s2sout.try_next_ip(host_session); - else - log("debug", "Out of IP addresses, trying next SRV record (if any)"); - host_session.ip_hosts = nil; - if not s2sout.attempt_connection(host_session, "out of IP addresses") then -- Retry if we can - log("debug", "No other records to try for %s - destroying", host_session.to_host); - err = err and (": "..err) or ""; - s2s_destroy_session(host_session, "Connecting failed"..err); -- End of the line, we can't - return false; - end - end - - return true; -end - -function s2sout.make_connect(host_session, connect_host, connect_port) - local log = host_session.log or log; - log("debug", "Beginning new connection attempt to %s ([%s]:%d)", host_session.to_host, connect_host.addr, connect_port); - - -- Reset secure flag in case this is another - -- connection attempt after a failed STARTTLS - host_session.secure = nil; - host_session.encrypted = nil; - - local conn, handler; - local proto = connect_host.proto; - if proto == "IPv4" then - conn, handler = socket.tcp(); - elseif proto == "IPv6" and socket.tcp6 then - conn, handler = socket.tcp6(); - else - handler = "Unsupported protocol: "..tostring(proto); - end - - 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.addr, 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.addr, connect_port, err); - return false, err; - end - - conn = wrapclient(conn, connect_host.addr, connect_port, s2s_listener, default_mode); - 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 - s2s_listener.register_outgoing(conn, host_session); - - log("debug", "Connection attempt in progress..."); - return true; -end - -module:hook_global("service-added", function (event) - if event.name ~= "s2s" then return end - - local s2s_sources = portmanager.get_active_services():get("s2s"); - if not s2s_sources then - module:log("warn", "s2s not listening on any ports, outgoing connections may fail"); - return; - end - for source, _ in pairs(s2s_sources) do - if source == "*" or source == "0.0.0.0" then - for _, addr in ipairs(local_addresses("ipv4", true)) do - sources[#sources + 1] = new_ip(addr, "IPv4"); - end - elseif source == "::" then - for _, addr in ipairs(local_addresses("ipv6", true)) do - sources[#sources + 1] = new_ip(addr, "IPv6"); - end - else - sources[#sources + 1] = new_ip(source, (source:find(":") and "IPv6") or "IPv4"); - end - end - for i = 1,#sources do - if sources[i].proto == "IPv6" then - has_ipv6 = true; - elseif sources[i].proto == "IPv4" then - has_ipv4 = true; - end - end - if not (has_ipv4 or has_ipv6) then - module:log("warn", "No local IPv4 or IPv6 addresses detected, outgoing connections may fail"); - end -end); - -return s2sout; |