/usr/lib/prosody/modules/mod_s2s/mod_s2s.lua is in prosody 0.9.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- 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 xpcall, traceback = xpcall, debug.traceback;
local NULL = {};
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 cert_verify_identity = require "util.x509".verify_identity;
local fire_global_event = prosody.events.fire_event;
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 sessions = module:shared("sessions");
local log = module._log;
--- 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 "..#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", 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
-- 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
if host.sendq then t_insert(host.sendq, {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)});
else host.sendq = { {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)} }; 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
(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
if host.sends2s(stanza) then
host.log("debug", "stanza sent over %s", host.type);
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
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 http://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);
end
-- Stream is authorised, and ready for normal stanzas
function mark_connected(session)
local sendq, send = session.sendq, session.sends2s;
local from, to = session.from_host, session.to_host;
session.log("info", "%s s2s connection %s->%s complete", session.direction, 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);
for i, data in ipairs(sendq) do
send(data[1]);
sendq[i] = nil;
end
session.sendq = nil;
end
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);
mark_connected(session);
return true;
end
--- Helper to check that a session peer's certificate is valid
local 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
if cert then
local chain_valid, errors;
if conn.getpeerverification then
chain_valid, errors = conn:getpeerverification();
elseif conn.getpeerchainvalid then -- COMPAT mw/luasec-hg
chain_valid, errors = conn:getpeerchainvalid();
errors = (not chain_valid) and { { errors } } or nil;
else
chain_valid, errors = false, { { "Chain verification not supported by this version of LuaSec" } };
end
-- 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");
for depth, t in pairs(errors or NULL) do
(session.log or log)("debug", "certificate error(s) at depth %d: %s", depth-1, table.concat(t, ", "))
end
session.cert_chain_status = "invalid";
else
(session.log or log)("debug", "certificate chain validation result: valid");
session.cert_chain_status = "valid";
-- 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
(session.log or log)("debug", "certificate identity validation result: %s", session.cert_identity_status);
end
end
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", handlestanza = core_process_stanza };
local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
function stream_callbacks.streamopened(session, attr)
local send = session.sends2s;
session.version = tonumber(attr.version) or 0;
-- TODO: Rename session.secure to session.encrypted
if session.secure == false then
session.secure = true;
-- Check if TLS compression is used
local sock = session.conn:socket();
if sock.info then
session.compressed = sock:info"compression";
elseif sock.compression then
session.compressed = 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)
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 "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
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
session.notopen = nil;
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:close("invalid-namespace");
elseif error == "parse-error" then
session.log("debug", "Server-to-server XML parse error: %s", tostring(error));
session:close("not-well-formed");
elseif error == "stream-error" then
local condition, text = "undefined-condition";
for child in data:children() do
if child.attr.xmlns == xmlns_xmpp_streams then
if child.name ~= "text" then
condition = child.name;
else
text = child:get_text();
end
if condition ~= "undefined-condition" and text then
break;
end
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 function handleerr(err) log("error", "Traceback[s2s]: %s", traceback(tostring(err), 2)); end
function stream_callbacks.handlestanza(session, stanza)
if stanza.attr.xmlns == "jabber:client" then --COMPAT: Prosody pre-0.6.2 may send jabber:client
stanza.attr.xmlns = nil;
end
stanza = session.filter("stanzas/in", stanza);
if stanza then
return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
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 "(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 "(unknown host)", session.type, tostring(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, tostring(reason));
session.sends2s(reason);
end
end
end
session.sends2s("</stream:stream>");
function session.sends2s() return false; end
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, 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_open_stream(session, from, to)
local attr = {
["xmlns:stream"] = 'http://etherx.jabber.org/streams',
xmlns = 'jabber:server',
version = session.version and (session.version > 0 and "1.0" or nil),
["xml:lang"] = 'en',
id = session.streamid,
from = from, to = to,
}
if not from or (hosts[from] and hosts[from].modules.dialback) then
attr["xmlns:db"] = 'jabber:server:dialback';
end
session.sends2s("<?xml version='1.0'?>");
session.sends2s(st.stanza("stream:stream", attr):top_tag());
return true;
end
-- Session initialization logic shared by incoming and outgoing
local function initialize_session(session)
local stream = new_xmpp_stream(session, stream_callbacks);
session.stream = stream;
session.notopen = true;
function session.reset_stream()
session.notopen = true;
session.stream:reset();
end
session.open_stream = session_open_stream;
local filter = session.filter;
function session.data(data)
data = filter("bytes/in", data);
if data then
local ok, err = stream:feed(data);
if ok then return; end
(session.log or log)("warn", "Received invalid XML: %s", data);
(session.log or log)("warn", "Problem was: %s", err);
session:close("not-well-formed");
end
end
session.close = session_close;
local handlestanza = stream_callbacks.handlestanza;
function session.dispatch_stanza(session, stanza)
return handlestanza(session, stanza);
end
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 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");
local filter = initialize_filters(session);
local w = conn.write;
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
initialize_session(session);
else -- Outgoing session connected
session:open_stream(session.from_host, session.to_host);
end
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
(session.log or log)("debug", "...so we're going to try another target");
return; -- Session lives for now
end
end
(session.log or log)("debug", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err or "connection closed"));
s2s_destroy_session(session, err);
end
end
function listener.register_outgoing(conn, session)
session.direction = "outgoing";
sessions[conn] = session;
initialize_session(session);
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);
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,500);
module:provides("net", {
name = "s2s";
listener = listener;
default_port = 5269;
encryption = "starttls";
multiplex = {
pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:server%1.*>";
};
});
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