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telebit-relay.js
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Show Bad Gateway rather than disconnect when south-end has gone missing.

This commit is contained in:
AJ ONeal 2018-11-04 01:10:40 +00:00
parent 9e06faa581
commit 0a67728239
3 changed files with 128 additions and 77 deletions
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8
bin/telebit-relay.js
View File

@ -47,7 +47,13 @@ function applyConfig(config) {
} else {
state.Promise = require('bluebird');
}
state.tlsOptions = {}; // TODO just close the sockets that would use this early? or use the admin servername
state.tlsOptions = {
// Handles disconnected devices
// TODO allow user to opt-in to wildcard hosting for a better error page?
SNICallback: function (servername, cb) {
return state.greenlock.tlsOptions.SNICallback(state.config.webminDomain || state.servernames[0], cb);
}
}; // TODO just close the sockets that would use this early? or use the admin servername
state.config = config;
state.servernames = config.servernames || [];
state.secret = state.config.secret;

49
lib/handlers.js
View File

@ -10,7 +10,7 @@ function noSniCallback(tag) {
var err = new Error("[noSniCallback] no handler set for '" + tag + "':'" + servername + "'");
console.error(err.message);
cb(new Error(err));
}
};
}
module.exports.create = function (state) {
@ -72,6 +72,28 @@ module.exports.create = function (state) {
state.tlsInvalidSniServer.on('tlsClientError', function () {
console.error('tlsClientError InvalidSniServer');
});
state.createHttpInvalid = function (servername) {
return http.createServer(function (req, res) {
if (!servername) {
res.statusCode = 422;
res.end(
"3. An inexplicable temporal shift of the quantum realm... that makes me feel uncomfortable.\n\n"
+ "[ERROR] No SNI header was sent. I can only think of two possible explanations for this:\n"
+ "\t1. You really love Windows XP and you just won't let go of Internet Explorer 6\n"
+ "\t2. You're writing a bot and you forgot to set the servername parameter\n"
);
return;
}
// TODO use req.headers.host instead of servername (since domain fronting is disabled anyway)
res.statusCode = 502;
res.end(
"<h1>Oops!</h1>"
+ "<p>It looks like '" + encodeURIComponent(servername) + "' isn't connected right now.</p>"
+ "<small>Error: 502 Bad Gateway</small>"
);
});
};
state.httpsInvalid = function (servername, socket) {
// none of these methods work:
// httpsServer.emit('connection', socket); // this didn't work
@ -82,28 +104,9 @@ module.exports.create = function (state) {
//state.tlsInvalidSniServer.emit('connection', wrapSocket(socket));
var tlsInvalidSniServer = tls.createServer(state.tlsOptions, function (tlsSocket) {
console.log('[tlsInvalid] tls connection');
// things get a little messed up here
var httpInvalidSniServer = http.createServer(function (req, res) {
if (!servername) {
res.statusCode = 422;
res.end(
"3. An inexplicable temporal shift of the quantum realm... that makes me feel uncomfortable.\n\n"
+ "[ERROR] No SNI header was sent. I can only think of two possible explanations for this:\n"
+ "\t1. You really love Windows XP and you just won't let go of Internet Explorer 6\n"
+ "\t2. You're writing a bot and you forgot to set the servername parameter\n"
);
return;
}
res.end(
"You came in hot looking for '" + servername + "' and, granted, the IP address for that domain"
+ " must be pointing here (or else how could you be here?), nevertheless either it's not registered"
+ " in the internal system at all (which Seth says isn't even a thing) or there is no device"
+ " connected on the south side of the network which has informed me that it's ready to have traffic"
+ " for that domain forwarded to it (sorry I didn't check that deeply to determine which).\n\n"
+ "Either way, you're doing strange things that make me feel uncomfortable... Please don't touch me there any more.");
});
httpInvalidSniServer.emit('connection', tlsSocket);
// We create an entire http server object because it's difficult to figure out
// how to access the original tlsSocket to get the servername
state.createHttpInvalid(servername).emit('connection', tlsSocket);
});
tlsInvalidSniServer.on('tlsClientError', function () {
console.error('tlsClientError InvalidSniServer httpsInvalid');

148
lib/unwrap-tls.js
View File

@ -27,6 +27,16 @@ module.exports.createTcpConnectionHandler = function (state) {
var str;
var m;
if (!firstChunk) {
try {
conn.end();
} catch(e) {
console.error("[lib/unwrap-tls.js] Error:", e);
conn.destroy();
}
return;
}
//conn.pause();
conn.unshift(firstChunk);
@ -40,6 +50,8 @@ module.exports.createTcpConnectionHandler = function (state) {
function deferData(fn) {
if (fn) {
state[fn](servername, conn);
} else {
console.error("[SANITY ERROR] '" + fn + "' doesn't have a state handler");
}
/*
process.nextTick(function () {
@ -48,33 +60,78 @@ module.exports.createTcpConnectionHandler = function (state) {
*/
}
function tryTls() {
var vhost;
if (!state.servernames.length) {
console.info("[Setup] https => admin => setup => (needs bogus tls certs to start?)");
deferData('httpsSetupServer');
return;
var httpOutcomes = {
missingServername: function () {
console.log("[debug] [http] missing servername");
// TODO use a more specific error page
deferData('handleInsecureHttp');
}
if (-1 !== state.servernames.indexOf(servername)) {
if (state.debug) { console.log("[Admin]", servername); }
deferData('httpsTunnel');
return;
, requiresSetup: function () {
console.log("[debug] [http] requires setup");
// TODO Insecure connections for setup will not work on secure domains (i.e. .app)
state.httpSetupServer.emit('connection', conn);
}
if (state.config.nowww && /^www\./i.test(servername)) {
console.log("TODO: use www bare redirect");
, isInternal: function () {
console.log("[debug] [http] is known internally (admin)");
if (/well-known/.test(str)) {
deferData('handleHttp');
} else {
deferData('handleInsecureHttp');
}
}
, isVhost: function () {
console.log("[debug] [http] is vhost (normal server)");
if (/well-known/.test(str)) {
deferData('handleHttp');
} else {
deferData('handleInsecureHttp');
}
}
, assumeExternal: function () {
console.log("[debug] [http] assume external");
var service = 'http';
if (!servername) {
if (!Devices.exist(state.deviceLists, servername)) {
// It would be better to just re-read the host header rather
// than creating a whole server object, but this is a "rare"
// case and I'm feeling lazy right now.
console.log("[debug] [http] no device connected");
state.createHttpInvalid(servername).emit('connection', conn);
return;
}
// TODO make https redirect configurable on a per-domain basis
// /^\/\.well-known\/acme-challenge\//.test(str)
if (/well-known/.test(str)) {
// HTTP
console.log("[debug] [http] passthru");
pipeWs(servername, service, Devices.next(state.deviceLists, servername), conn, serviceport);
return;
} else {
console.log("[debug] [http] redirect to https");
deferData('handleInsecureHttp');
}
}
};
var tlsOutcomes = {
missingServername: function () {
if (state.debug) { console.log("No SNI was given, so there's nothing we can do here"); }
deferData('httpsInvalid');
return;
}
function run() {
var nextDevice = Devices.next(state.deviceLists, servername);
, requiresSetup: function () {
console.info("[Setup] https => admin => setup => (needs bogus tls certs to start?)");
deferData('httpsSetupServer');
}
, isInternal: function () {
if (state.debug) { console.log("[Admin]", servername); }
deferData('httpsTunnel');
}
, isVhost: function (vhost) {
if (state.debug) { console.log("[tcp] [vhost]", state.config.vhost, "=>", vhost); }
deferData('httpsVhost');
}
, assumeExternal: function () {
var nextDevice = Devices.next(state.deviceLists, servername);
if (!nextDevice) {
if (state.debug) { console.log("No devices match the given servername"); }
deferData('httpsInvalid');
@ -82,27 +139,33 @@ module.exports.createTcpConnectionHandler = function (state) {
}
if (state.debug) { console.log("pipeWs(servername, service, deviceLists['" + servername + "'], socket)"); }
deferData();
pipeWs(servername, service, nextDevice, conn, serviceport);
}
};
function handleConnection(outcomes) {
var vhost;
// No routing information available
if (!servername) { outcomes.missingServername(); return; }
// Server needs to be set up
if (!state.servernames.length) { outcomes.requiresSetup(); return; }
// This is one of the admin domains
if (-1 !== state.servernames.indexOf(servername)) { outcomes.isInternal(); return; }
// TODO don't run an fs check if we already know this is working elsewhere
//if (!state.validHosts) { state.validHosts = {}; }
if (state.config.vhost) {
vhost = state.config.vhost.replace(/:hostname/, (servername||'reallydoesntexist'));
if (state.debug) { console.log("[tcp] [vhost]", state.config.vhost, "=>", vhost); }
//state.httpsVhost(servername, conn);
//return;
vhost = state.config.vhost.replace(/:hostname/, servername);
require('fs').readdir(vhost, function (err, nodes) {
if (state.debug && err) { console.log("VHOST error", err); }
if (err || !nodes) { run(); return; }
//if (nodes) { deferData('httpsVhost'); return; }
deferData('httpsVhost');
if (err || !nodes) { outcomes.assumeExternal(); return; }
outcomes.isVhost(vhost);
});
return;
}
run();
outcomes.assumeExternal();
}
// https://github.com/mscdex/httpolyglot/issues/3#issuecomment-173680155
@ -111,40 +174,19 @@ module.exports.createTcpConnectionHandler = function (state) {
service = 'https';
servername = (sni(firstChunk)||'').toLowerCase().trim();
if (state.debug) { console.log("[tcp] tls hello from '" + servername + "'"); }
tryTls();
handleConnection(tlsOutcomes);
return;
}
if (firstChunk[0] > 32 && firstChunk[0] < 127) {
// (probably) HTTP
str = firstChunk.toString();
m = str.match(/(?:^|[\r\n])Host: ([^\r\n]+)[\r\n]*/im);
servername = (m && m[1].toLowerCase() || '').split(':')[0];
if (state.debug) { console.log("[tcp] http hostname '" + servername + "'"); }
if (/HTTP\//i.test(str)) {
if (!state.servernames.length) {
console.info("[tcp] No admin servername. Entering setup mode.");
deferData();
state.httpSetupServer.emit('connection', conn);
return;
}
service = 'http';
// TODO make https redirect configurable
// /^\/\.well-known\/acme-challenge\//.test(str)
if (/well-known/.test(str)) {
// HTTP
if (Devices.exist(state.deviceLists, servername)) {
deferData();
pipeWs(servername, service, Devices.next(state.deviceLists, servername), conn, serviceport);
return;
}
deferData('handleHttp');
return;
}
// redirect to https
deferData('handleInsecureHttp');
handleConnection(httpOutcomes);
return;
}
}