-- 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.
--
local prosody = prosody;
local hosts = prosody.hosts;
-local core_process_stanza = core_process_stanza;
+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 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 s2s_mark_connected = require "core.s2smanager".mark_connected;
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", 60);
+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");
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
return true;
end
+local function keepalive(event)
+ return event.session.sends2s(' ');
+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 http://prosody.im/doc/s2s#disabling");
return nil, "This host has disallow_s2s set";
end
- module:hook("route/remote", route_to_existing_session, 200);
- module:hook("route/remote", route_to_new_session, 100);
+ 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);
+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: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);
+ 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
end
if cert then
- local chain_valid, errors = conn:getpeerverification()
+ 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 ipairs(errors) do
+ 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";
(session.log or log)("debug", "certificate chain validation result: valid");
session.cert_chain_status = "valid";
- local host = session.direction == "incoming" and session.from_host or session.to_host
-
-- We'll go ahead and verify the asserted identity if the
-- connecting server specified one.
if host then
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
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;
+
+ 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 '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: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
end
end
- if session.secure and not session.cert_chain_status then check_cert_status(session); end
+ if hosts[from] then
+ session:close({ condition = "undefined-condition", text = "Attempt to connect from a host we serve" });
+ return;
+ end
- send("<?xml version='1.0'?>");
- send(st.stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
- ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=to, to=from, version=(session.version > 0 and "1.0" or nil) }):top_tag());
+ 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
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
+ 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)
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("s2s-authenticate-legacy", { origin = session });
+ hosts[session.from_host].events.fire_event("s2sout-authenticate-legacy", { origin = session });
else
- s2s_mark_connected(session);
+ mark_connected(session);
end
end
end
end
end
-local function handleerr(err) log("error", "Traceback[s2s]: %s: %s", tostring(err), traceback()); 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;
--- Session methods
local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
-local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
local function session_close(session, reason, remote_reason)
local log = session.log or log;
if session.conn then
if session.notopen then
- session.sends2s("<?xml version='1.0'?>");
- session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
+ 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("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
+ 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
if reason.extra then
stanza:add_child(reason.extra);
end
- log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
+ 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("info", "Disconnecting %s->%s[%s], <stream:error> is: %s", session.from_host or "(unknown host)", session.to_host or "(unknown host)", session.type, tostring(reason));
+ 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
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");
-
+ 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
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);
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",
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);
end
end
end
-
+
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)
session.data(data);
end
end
-
+
function listener.onstatus(conn, status)
if status == "ssl-handshake-complete" then
local session = sessions[conn];
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);
- sessions[conn] = nil;
+ end
+end
+
+function listener.onreadtimeout(conn)
+ local session = sessions[conn];
+ if session then
+ return (hosts[session.host] or prosody).events.fire_event("s2s-read-timeout", { session = session });
end
end
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:add_item("net-provider", {
+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;
projects / prosody.git / blobdiff