diff options
Diffstat (limited to 'plugins/mod_s2s')
| -rw-r--r-- | plugins/mod_s2s/mod_s2s.lua | 301 | ||||
| -rw-r--r-- | plugins/mod_s2s/s2sout.lib.lua | 349 |
2 files changed, 180 insertions, 470 deletions
diff --git a/plugins/mod_s2s/mod_s2s.lua b/plugins/mod_s2s/mod_s2s.lua index aae37b7f..9f7d4d6d 100644 --- a/plugins/mod_s2s/mod_s2s.lua +++ b/plugins/mod_s2s/mod_s2s.lua @@ -27,8 +27,10 @@ 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 = require "net.connect".connect; +local service = require "net.resolvers.service"; +local errors = require "util.error"; +local set = require "util.set"; local connect_timeout = module:get_option_number("s2s_timeout", 90); local stream_close_timeout = module:get_option_number("s2s_close_timeout", 5); @@ -45,8 +47,16 @@ local sessions = module:shared("sessions"); local runner_callbacks = {}; +local listener = {}; + local log = module._log; +local s2s_service_options = { + default_port = 5269; + use_ipv4 = module:get_option_boolean("use_ipv4", true); + use_ipv6 = module:get_option_boolean("use_ipv6", true); +}; + module:hook("stats-update", function () local count = 0; local ipv6 = 0; @@ -77,15 +87,28 @@ local function bounce_sendq(session, reason) (session.log or log)("error", "Attempting to close the dummy origin of s2s error replies, please report this! Traceback: %s", traceback()); end; }; + -- FIXME Allow for more specific error conditions + -- TODO use util.error ? + local error_type = "cancel"; + local condition = "remote-server-not-found"; + local reason_text; + if session.had_stream then -- set when a stream is opened by the remote + error_type, condition = "wait", "remote-server-timeout"; + end + if errors.is_err(reason) then + error_type, condition, reason_text = reason.type, reason.condition, reason.text; + elseif type(reason) == "string" then + reason_text = reason; + 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("error", {type = error_type, by = session.from_host}) + :tag(condition, {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up(); + if reason_text then reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}) - :text("Server-to-server connection failed: "..reason):up(); + :text("Server-to-server connection failed: "..reason_text):up(); end core_process_stanza(dummy, reply); end @@ -106,38 +129,33 @@ function route_to_existing_session(event) 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; + if not host then return end + + -- 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 - -- 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 + -- 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", stanza); + return false; + else + if host.sends2s(stanza) then + return true; end end end @@ -147,17 +165,13 @@ 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); + host_session.version = 1; -- 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 + log("debug", "stanza [%s] queued until connection complete", stanza.name); + connect(service.new(to_host, "xmpp-server", "tcp", s2s_service_options), listener, nil, { session = host_session }); return true; end @@ -182,10 +196,20 @@ function module.add_host(module) -- so the stream is ready for stanzas. RFC 6120 Section 4.3 mark_connected(session); return true; + elseif require_encryption and not session.secure then + session.log("warn", "Encrypted server-to-server communication is required but was not offered by %s", session.to_host); + session:close({ + condition = "policy-violation", + text = "Encrypted server-to-server communication is required but was not offered", + }, nil, "Could not establish encrypted connection to remote server"); + 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; + session:close({ + condition = "unsupported-feature", + text = "No viable authentication method offered", + }, nil, "No viable authentication method offered by remote server"); + return true; end end, -1); end @@ -203,7 +227,18 @@ function mark_connected(session) if session.type == "s2sout" then fire_global_event("s2sout-established", event_data); hosts[from].events.fire_event("s2sout-established", event_data); + + if session.incoming then + session.send = function(stanza) + return hosts[from].events.fire_event("route/remote", { from_host = from, to_host = to, stanza = stanza }); + end; + end + else + if session.outgoing and not hosts[to].s2sout[from] then + session.log("debug", "Setting up to handle route from %s to %s", to, from); + hosts[to].s2sout[from] = session; -- luacheck: ignore 122 + end 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 }); @@ -223,13 +258,6 @@ function mark_connected(session) 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 @@ -241,7 +269,7 @@ function make_authenticated(event) condition = "policy-violation", text = "Encrypted server-to-server communication is required but was not " ..((session.direction == "outgoing" and "offered") or "used") - }); + }, nil, "Could not establish encrypted connection to remote server"); end end if hosts[host] then @@ -251,15 +279,13 @@ function make_authenticated(event) 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 + elseif session.type ~= "s2sin" and session.type ~= "s2sout" then + return false; + end + + if session.incoming 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); @@ -296,11 +322,12 @@ 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 }); + session.thread:run({ stream = "opened", attr = attr }); end function stream_callbacks._streamopened(session, attr) session.version = tonumber(attr.version) or 0; + session.had_stream = true; -- Had a stream opened at least once -- TODO: Rename session.secure to session.encrypted if session.secure == false then @@ -314,7 +341,6 @@ function stream_callbacks._streamopened(session, attr) 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 @@ -322,7 +348,9 @@ function stream_callbacks._streamopened(session, attr) -- Send a reply stream header -- Validate to/from - local to, from = nameprep(attr.to), nameprep(attr.from); + local to, from = attr.to, attr.from; + if to then to = nameprep(attr.to); end + if from then from = nameprep(attr.from); end 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; @@ -416,20 +444,6 @@ function stream_callbacks._streamopened(session, attr) 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 @@ -441,11 +455,16 @@ function stream_callbacks._streamopened(session, attr) end end -function stream_callbacks.streamclosed(session) +function stream_callbacks._streamclosed(session) (session.log or log)("debug", "Received </stream:stream>"); session:close(false); end +function stream_callbacks.streamclosed(session, attr) + -- run _streamclosed in async context + session.thread:run({ stream = "closed", attr = attr }); +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}"))); @@ -471,11 +490,12 @@ function stream_callbacks.error(session, error, data) 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) +-- reason: stream error to send to the remote server +-- remote_reason: stream error received from the remote server +-- bounce_reason: stanza error to pass to bounce_sendq because stream- and stanza errors are different +local function session_close(session, reason, remote_reason, bounce_reason) local log = session.log or log; if session.conn then if session.notopen then @@ -486,28 +506,24 @@ local function session_close(session, reason, remote_reason) end end if reason then -- nil == no err, initiated by us, false == initiated by remote + local stream_error; 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); + stream_error = st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }); + elseif type(reason) == "table" and not st.is_stanza(reason) then + stream_error = st.stanza("stream:error"):tag(reason.condition or "undefined-condition", stream_xmlns_attr):up(); + if reason.text then + stream_error:tag("text", stream_xmlns_attr):text(reason.text):up(); + end + if reason.extra then + stream_error:add_child(reason.extra); end end + if st.is_stanza(stream_error) then + -- to and from are never unknown on outgoing connections + log("debug", "Disconnecting %s->%s[%s], <stream:error> is: %s", + session.from_host or "(unknown host)" or session.ip, session.to_host or "(unknown host)", session.type, reason); + session.sends2s(stream_error); + end end session.sends2s("</stream:stream>"); @@ -521,16 +537,16 @@ local function session_close(session, reason, remote_reason) -- 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 + if reason == nil and not session.notopen and session.incoming 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); + s2s_destroy_session(session, reason, bounce_reason); conn:close(); end end); else - s2s_destroy_session(session, reason); + s2s_destroy_session(session, reason, bounce_reason); conn:close(); -- Close immediately, as this is an outgoing connection or is not authed end end @@ -553,10 +569,12 @@ local function initialize_session(session) local stream = new_xmpp_stream(session, stream_callbacks); session.thread = runner(function (stanza) - if stanza.name == nil then - stream_callbacks._streamopened(session, stanza.attr); - else + if st.is_stanza(stanza) then core_process_stanza(session, stanza); + elseif stanza.stream == "opened" then + stream_callbacks._streamopened(session, stanza.attr); + elseif stanza.stream == "closed" then + stream_callbacks._streamclosed(session, stanza.attr); end end, runner_callbacks, session); @@ -595,9 +613,8 @@ local function initialize_session(session) if data then local ok, err = stream:feed(data); if ok then return; end - log("warn", "Received invalid XML: %s", data); - log("warn", "Problem was: %s", err); - session:close("not-well-formed"); + log("debug", "Received invalid XML (%s) %d bytes: %q", err, #data, data:sub(1, 300)); + session:close("not-well-formed", nil, "Received invalid XML from remote server"); end end @@ -672,11 +689,20 @@ function listener.ondisconnect(conn, err) local session = sessions[conn]; if session then sessions[conn] = nil; + (session.log or log)("debug", "s2s disconnected: %s->%s (%s)", session.from_host, session.to_host, err or "connection closed"); + if session.secure == false and err then + -- TODO util.error-ify this + err = "Error during negotiation of encrypted connection: "..err; + end + s2s_destroy_session(session, err); + end +end + +function listener.onfail(data, err) + local session = data and data.session; + if session then 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); @@ -700,6 +726,34 @@ function listener.ondetach(conn) sessions[conn] = nil; end +function listener.onattach(conn, data) + local session = data and data.session; + if session then + session.conn = conn; + sessions[conn] = session; + initialize_session(session); + end +end + +-- Complete the sentence "Your certificate " with what's wrong +local function friendly_cert_error(session) --> string + if session.cert_chain_status == "invalid" then + if session.cert_chain_errors then + local cert_errors = set.new(session.cert_chain_errors[1]); + if cert_errors:contains("certificate has expired") then + return "has expired"; + elseif cert_errors:contains("self signed certificate") then + return "is self-signed"; + end + end + return "is not trusted"; -- for some other reason + elseif session.cert_identity_status == "invalid" then + return "is not valid for this name"; + end + -- this should normally be unreachable except if no s2s auth module was loaded + return "could not be validated"; +end + function check_auth_policy(event) local host, session = event.host, event.session; local must_secure = secure_auth; @@ -711,20 +765,21 @@ function check_auth_policy(event) 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 + local reason = friendly_cert_error(session); + session.log("warn", "Forbidding insecure connection to/from %s because its certificate %s", host or session.ip or "(unknown host)", reason); + -- XEP-0178 recommends closing outgoing connections without warning + -- but does not give a rationale for this. + -- In practice most cases are configuration mistakes or forgotten + -- certificate renewals. We think it's better to let the other party + -- know about the problem so that they can fix it. + session:close({ condition = "not-authorized", text = "Your server's certificate "..reason }, + nil, "Remote server's certificate "..reason); 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 @@ -739,7 +794,11 @@ module:provides("net", { listener = listener; default_port = 5269; encryption = "starttls"; + ssl_config = { -- FIXME This is not used atm, see mod_tls + verify = { "peer", "client_once", }; + }; multiplex = { + protocol = "xmpp-server"; 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; |