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-rw-r--r--core/s2smanager.lua97
1 files changed, 63 insertions, 34 deletions
diff --git a/core/s2smanager.lua b/core/s2smanager.lua
index 3613707c..d8ceb4ef 100644
--- a/core/s2smanager.lua
+++ b/core/s2smanager.lua
@@ -36,8 +36,6 @@ local log = logger_init("s2smanager");
local sha256_hash = require "util.hashes".sha256;
-local dialback_secret = uuid_gen();
-
local adns, dns = require "net.adns", require "net.dns";
local config = require "core.configmanager";
local connect_timeout = config.get("*", "core", "s2s_timeout") or 60;
@@ -52,7 +50,7 @@ module "s2smanager"
local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end
-local function bounce_sendq(session)
+local 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));
@@ -70,6 +68,9 @@ local function bounce_sendq(session)
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;
@@ -79,15 +80,15 @@ local function bounce_sendq(session)
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" and ((not data.xmlns) or data.xmlns == "jabber:client" or data.xmlns == "jabber:server") then
+ if host.type == "s2sout_unauthed" and (data.name ~= "db:verify" or not host.dialback_key) and ((not data.xmlns) or data.xmlns == "jabber:client" or data.xmlns == "jabber:server") then
(host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host);
- if not host.notopen and not host.dialback_key and host.sends2s then
- host.log("debug", "dialback had not been initiated");
- initiate_dialback(host);
- end
-- Queue stanza until we are able to send it
if host.sendq then t_insert(host.sendq, {tostring(data), st.reply(data)});
@@ -110,6 +111,7 @@ function send_to_host(from_host, to_host, data)
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));
@@ -131,7 +133,7 @@ function new_incoming(conn)
open_sessions = open_sessions + 1;
local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$"));
session.log = log;
- session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end
+ session.sends2s = function (t) log("debug", "sending: %s", t.top_tag and t:top_tag() or t:match("^([^>]*>?)")); w(conn, tostring(t)); end
incoming_s2s[session] = true;
add_task(connect_timeout, function ()
if session.conn ~= conn or
@@ -139,16 +141,17 @@ function new_incoming(conn)
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.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)
- local host_session = { to_host = to_host, from_host = from_host, host = from_host,
- notopen = true, type = "s2sout_unauthed", direction = "outgoing" };
+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;
@@ -159,10 +162,12 @@ function new_outgoing(from_host, to_host)
host_session.log = log;
end
- -- This is the first call, can't fail (the first step is DNS lookup)
- attempt_connection(host_session);
+ if connect ~= false then
+ -- Kick the connection attempting machine into life
+ attempt_connection(host_session);
+ end
- if not host_session.sends2s then
+ 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
@@ -176,7 +181,6 @@ function new_outgoing(from_host, to_host)
buffer[#buffer+1] = data;
log("debug", "Buffered item %d: %s", #buffer, tostring(data));
end
-
end
return host_session;
@@ -187,6 +191,10 @@ function attempt_connection(host_session, err)
local from_host, to_host = host_session.from_host, host_session.to_host;
local connect_host, connect_port = idna_to_ascii(to_host), 5269;
+ if not 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;
@@ -217,7 +225,7 @@ function attempt_connection(host_session, err)
if not ok then
if not attempt_connection(host_session, err) then
-- No more attempts will be made
- destroy_session(host_session);
+ destroy_session(host_session, err);
end
end
end, "_xmpp-server._tcp."..connect_host..".", "SRV");
@@ -277,7 +285,7 @@ function try_connect(host_session, connect_host, connect_port)
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);
- destroy_session(host_session); -- End of the line, we can't
+ destroy_session(host_session, "DNS resolution failed"); -- End of the line, we can't
end
end
end, connect_host, "A", "IN");
@@ -288,7 +296,7 @@ function try_connect(host_session, connect_host, connect_port)
adns.cancel(handle, true);
end
end);
-
+
return true;
end
@@ -299,6 +307,11 @@ function make_connect(host_session, connect_host, connect_port)
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);
@@ -308,7 +321,7 @@ function make_connect(host_session, connect_host, connect_port)
end
local cl = connlisteners_get("xmppserver");
- conn = wrapclient(conn, connect_host, connect_port, cl, cl.default_mode or 1, hosts[from_host].ssl_ctx, false );
+ conn = wrapclient(conn, connect_host, connect_port, cl, cl.default_mode or 1 );
host_session.conn = conn;
-- Register this outgoing connection so that xmppserver_listener knows about it
@@ -316,9 +329,10 @@ function make_connect(host_session, connect_host, connect_port)
cl.register_outgoing(conn, host_session);
local w, log = conn.write, host_session.log;
- host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end
+ host_session.sends2s = function (t) log("debug", "sending: %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?")); w(conn, tostring(t)); end
+
+ host_session:open_stream(from_host, to_host);
- conn.write(format([[<stream:stream xmlns='jabber:server' xmlns:db='jabber:server:dialback' xmlns:stream='http://etherx.jabber.org/streams' from='%s' to='%s' version='1.0' xml:lang='en'>]], from_host, to_host));
log("debug", "Connection attempt in progress...");
add_task(connect_timeout, function ()
if host_session.conn ~= conn or
@@ -327,13 +341,20 @@ function make_connect(host_session, connect_host, connect_port)
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.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
+
function streamopened(session, attr)
local send = session.sends2s;
@@ -345,7 +366,6 @@ function streamopened(session, attr)
end
if session.version >= 1.0 and not (attr.to and attr.from) then
-
(session.log or log)("warn", "Remote of stream "..(session.from_host or "(unknown)").."->"..(session.to_host or "(unknown)")
.." failed to specify to (%s) and/or from (%s) hostname as per RFC", tostring(attr.to), tostring(attr.from));
end
@@ -357,17 +377,17 @@ function streamopened(session, attr)
session.streamid = uuid_gen();
(session.log or log)("debug", "incoming s2s received <stream:stream>");
- send("<?xml version='1.0'?>");
- send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
- ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host, version=(session.version > 0 and "1.0" or nil) }):top_tag());
if session.to_host and not hosts[session.to_host] then
-- Attempting to connect to a host we don't serve
session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host });
return;
end
+ 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", { session = session, features = features });
else
@@ -384,7 +404,7 @@ function streamopened(session, attr)
-- Send unauthed buffer
-- (stanzas which are fine to send before dialback)
- -- Note that this is *not* the stanza queue (which
+ -- 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
@@ -406,7 +426,6 @@ function streamopened(session, attr)
end
end
end
-
session.notopen = nil;
end
@@ -426,7 +445,7 @@ function initiate_dialback(session)
end
function generate_dialback(id, to, from)
- return sha256_hash(id..to..from..dialback_secret, true);
+ return sha256_hash(id..to..from..hosts[from].dialback_secret, true);
end
function verify_dialback(id, to, from, key)
@@ -434,6 +453,16 @@ function verify_dialback(id, to, from, key)
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
@@ -479,12 +508,12 @@ function mark_connected(session)
end
end
-function destroy_session(session)
+function destroy_session(session, reason)
(session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host));
if session.direction == "outgoing" then
hosts[session.from_host].s2sout[session.to_host] = nil;
- bounce_sendq(session);
+ bounce_sendq(session, reason);
elseif session.direction == "incoming" then
incoming_s2s[session] = nil;
end
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-23 03:12:51 +0000