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server.js
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server.js
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'use strict';
const fs = require('fs');
const crypto = require('crypto');
const https = require('https');
const util = require('util');
const path = require('path');
const AWS = require('aws-sdk');
const s3 = new AWS.S3();
const moment = require('moment');
const simpleMemoryStream = require('./simpleMemoryStream.js');
const config = require('./config.js');
const startupUID = crypto.randomBytes(16).toString('hex');
const startupTime = moment().format('YYYY-MM-DD_HH-mm-ss-SSSS');
const header = `${startupTime}_${startupUID}`;
console.log('Starting ' + header);
let _reqCount = 0;
const pubKey = fs.readFileSync(config.encryptToPub, 'utf8');
const httpsOptions = {
key: fs.readFileSync(config.httpsKey, 'utf8'),
cert: fs.readFileSync(config.httpsCert, 'utf8'),
ca: [
fs.readFileSync(config.httpsCA, 'utf8'),
]
}
const server = https.createServer(httpsOptions, function (req, res) {
req.on('error', function (err) {
console.log('error in req: ' + util.inspect(err));
});
res.on('error', function (err) {
console.log('error in res: ' + util.inspect(err));
});
if (req.url == '/') {
fs.readFile('index.html', function (err, data) {
res.writeHead(200, {
'content-type': 'text/html'
});
res.write(data);
res.end();
});
} else if (req.url == '/key.pub') {
fs.readFile('key.pub', function (err, data) {
res.writeHead(200, {
'content-type': 'text/plain'
});
res.write(data);
res.end();
});
} else if (req.url == '/check.png') {
fs.readFile('check.png', function (err, data) {
res.writeHead(200, {
'content-type': 'image/png'
});
res.end(data, 'binary');
});
} else if (req.url == '/alive.php') {
res.writeHead(200, {
'content-type': 'text/html'
});
res.end();
} else if (req.url == '/upload.do') {
res.setTimeout(0);
const currentReq = ++_reqCount;
let totalLen = 0;
let chunkCount = 0;
// generate random key/IV for every file
const aesIV = crypto.randomBytes(128 / 8);
const aesKey = crypto.randomBytes(256 / 8);
// ecnrypt generated key to the public key we have in config
var cryptedAesKey = crypto.publicEncrypt(pubKey, aesKey);
// anything written to here gets uploaded to s3
const cryptedData = new simpleMemoryStream();
// start watching cryptedData for changes and upload as they come
const uploader = s3.upload({
Bucket: config.s3Bucket,
Key: header + '_' + currentReq + '.bin',
Body: cryptedData
}, function (err, uploadResult) {
if (err) {
console.error(`Error creating S3 upload: ${err}`);
return;
}
// TODO: track this
});
uploader.on('httpUploadProgress', (progress) => {
// TODO: track this
});
var aes = crypto.createCipheriv('aes-256-cbc', aesKey, aesIV);
aes.on('data', function (chunk) {
cryptedData.write(chunk);
});
aes.on('end', function () {
cryptedData.finish();
cryptedData.end();
});
// first write header
cryptedData.write(aesIV);
cryptedData.write(cryptedAesKey);
var hash = crypto.createHash('sha512');
hash.write(aesIV);
hash.write(aesKey);
var reqHeaders = JSON.stringify(req.headers);
if (reqHeaders.length > 0xFFFFFFFF) {
// writeUInt32LE can't handle integers over 0xFFFFFFFF
console.log('headers are too big, skipping request ' + reqHeaders.length);
res.end();
return;
}
var cryptedHeader = new Buffer(1 + 4 + reqHeaders.length);
cryptedHeader.writeUInt8(2, 0); // format version
cryptedHeader.writeUInt32LE(reqHeaders.length, 1);
cryptedHeader.write(reqHeaders, 5);
aes.write(cryptedHeader);
hash.write(cryptedHeader);
req.on('data', function (chunk) {
totalLen += chunk.length;
++chunkCount;
aes.write(chunk);
hash.write(chunk);
});
req.on('end', function () {
hash.end();
var hashDigest = hash.read();
aes.write(hashDigest);
aes.write(aesIV);
aes.end();
res.writeHead(200, {
'content-type': 'text/html'
});
res.write('<img src="check.png" /><br />');
res.write('received ' + totalLen + ' bytes in ' + chunkCount + ' chunks');
res.end();
});
} else {
res.writeHead(404, {
'content-type': 'text/plain'
});
res.end();
}
});
server.on('connection', function (socket) {
socket.setNoDelay(true);
});
server.setTimeout(0);
server.listen(config.listenPort, config.listenAddr, null, () => {
// drop privileges on POSIX os (needed if binding to port 80 or 443)
if (process.setuid && process.setgid) {
try {
process.setgid(config.processGID);
process.setuid(config.processUID);
console.log(` listening on ${config.listenAddr}:${config.listenPort} as ${process.getuid()}/${process.getgid()}`);
} catch (err) {
console.error('FAILED TO CHANGE USER: ' + err);
process.exit(1);
}
} else {
console.log(` listening on ${config.listenAddr}:${config.listenPort}`);
}
});