aboutsummaryrefslogtreecommitdiffstats
path: root/core/s2smanager.lua
diff options
context:
space:
mode:
Diffstat (limited to 'core/s2smanager.lua')
-rw-r--r--core/s2smanager.lua501
1 files changed, 18 insertions, 483 deletions
diff --git a/core/s2smanager.lua b/core/s2smanager.lua
index e3c536f4..5907ff2f 100644
--- a/core/s2smanager.lua
+++ b/core/s2smanager.lua
@@ -9,25 +9,21 @@
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 tostring, pairs, ipairs, getmetatable, newproxy, type, error, tonumber, setmetatable
+ = tostring, pairs, ipairs, getmetatable, newproxy, type, 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 new_ip = require "util.ip".new_ip;
+local rfc3484_dest = require "util.rfc3484".destination;
local fire_event = prosody.events.fire_event;
local uuid_gen = require "util.uuid".generate;
@@ -40,10 +36,12 @@ 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;
+local cfg_sources = config.get("*", "core", "s2s_interface")
+ or config.get("*", "core", "interface");
+local sources;
+--FIXME: s2sout should create its own resolver w/ timeout
dns.settimeout(dns_timeout);
local prosody = _G.prosody;
@@ -53,89 +51,6 @@ local incoming_s2s = incoming_s2s;
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];
- if reply and not(reply.attr.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("Server-to-server 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), data.attr.type ~= "error" and data.attr.type ~= "result" and st.reply(data)});
- else host.sendq = { {tostring(data), data.attr.type ~= "error" and data.attr.type ~= "result" and 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), data.attr.type ~= "error" and data.attr.type ~= "result" and 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)
@@ -145,396 +60,18 @@ function new_incoming(conn)
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]+$"));
- session.log = log;
- local filter = initialize_filters(session);
- session.sends2s = function (t)
- log("debug", "sending: %s", t.top_tag and t:top_tag() or t:match("^([^>]*>?)"));
- if t.name then
- t = filter("stanzas/out", t);
- end
- if t then
- t = filter("bytes/out", tostring(t));
- if t then
- return w(conn, t);
- end
- end
- end
+ session.log = logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$"));
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)("debug", "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, errors = conn:getpeerverification()
- -- Is there any interest in printing out all/the number of errors here?
- if not chain_valid then
- (session.log or log)("debug", "certificate chain validation result: invalid");
- session.cert_chain_status = "invalid";
- else
- (session.log or log)("debug", "certificate chain validation result: valid");
- session.cert_chain_status = "valid";
-
- local host;
- if session.direction == "incoming" then
- host = session.from_host;
- else
- host = session.to_host;
- end
-
- -- 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 %s", st.stanza("stream:stream", attr):top_tag());
- 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);
+ local host_session = { to_host = to_host, from_host = from_host, host = from_host,
+ notopen = true, type = "s2sout_unauthed", direction = "outgoing" };
+ hosts[from_host].s2sout[to_host] = host_session;
+ local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$");
+ host_session.log = logger_init(conn_name);
+ return host_session;
end
function make_authenticated(session, host)
@@ -576,10 +113,7 @@ function mark_connected(session)
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);
@@ -599,6 +133,7 @@ function mark_connected(session)
session.sendq = nil;
end
+ session.ip_hosts = nil;
session.srv_hosts = nil;
end
end
@@ -636,7 +171,7 @@ function destroy_session(session, reason)
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
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 09:50:35 +0000