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https://gitlab.com/timvisee/send.git
synced 2024-11-08 20:22:45 +01:00
fixed size limit on server to include crypto overhead
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dce8b6e525
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@ -281,11 +281,6 @@ class StreamSlicer {
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}
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}
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export function encryptedSize(size, rs = ECE_RECORD_SIZE) {
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const chunk_meta = TAG_LENGTH + 1; // Chunk metadata, tag and delimiter
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return 21 + size + chunk_meta * Math.ceil(size / (rs - chunk_meta));
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}
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/*
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input: a ReadableStream containing data to be transformed
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key: Uint8Array containing key of size KEY_LENGTH
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@ -3,7 +3,7 @@ import OwnedFile from './ownedFile';
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import Keychain from './keychain';
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import { arrayToB64, bytes } from './utils';
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import { uploadWs } from './api';
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import { encryptedSize } from './ece';
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import { encryptedSize } from './utils';
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export default class FileSender extends Nanobus {
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constructor() {
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10
app/utils.js
10
app/utils.js
@ -249,6 +249,13 @@ function platform() {
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return 'web';
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}
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const ECE_RECORD_SIZE = 1024 * 64;
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const TAG_LENGTH = 16;
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function encryptedSize(size, rs = ECE_RECORD_SIZE, tagLength = TAG_LENGTH) {
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const chunk_meta = tagLength + 1; // Chunk metadata, tag and delimiter
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return 21 + size + chunk_meta * Math.ceil(size / (rs - chunk_meta));
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}
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module.exports = {
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fadeOut,
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delay,
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@ -267,5 +274,6 @@ module.exports = {
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list,
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secondsToL10nId,
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timeLeft,
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platform
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platform,
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encryptedSize
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};
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@ -11,6 +11,7 @@ class Limiter extends Transform {
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this.length += chunk.length;
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this.push(chunk);
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if (this.length > this.limit) {
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console.error('LIMIT', this.length, this.limit);
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return callback(new Error('limit'));
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}
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callback();
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@ -3,6 +3,7 @@ const storage = require('../storage');
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const config = require('../config');
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const mozlog = require('../log');
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const Limiter = require('../limiter');
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const { encryptedSize } = require('../../app/utils');
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const log = mozlog('send.upload');
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@ -22,7 +23,7 @@ module.exports = async function(req, res) {
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};
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try {
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const limiter = new Limiter(config.max_file_size);
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const limiter = new Limiter(encryptedSize(config.max_file_size));
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const fileStream = req.pipe(limiter);
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//this hasn't been updated to expiration time setting yet
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//if you want to fallback to this code add this
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@ -6,6 +6,7 @@ const Limiter = require('../limiter');
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const wsStream = require('websocket-stream/stream');
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const fxa = require('../fxa');
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const { statUploadEvent } = require('../amplitude');
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const { encryptedSize } = require('../../app/utils');
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const { Duplex } = require('stream');
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@ -74,7 +75,7 @@ module.exports = function(ws, req) {
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id: newId
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})
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);
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const limiter = new Limiter(maxFileSize);
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const limiter = new Limiter(encryptedSize(maxFileSize));
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const flowControl = new Duplex({
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read() {
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ws.resume();
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@ -92,8 +93,8 @@ module.exports = function(ws, req) {
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});
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fileStream = wsStream(ws, { binary: true })
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.pipe(limiter)
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.pipe(flowControl);
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.pipe(flowControl)
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.pipe(limiter); // limiter needs to be the last in the chain
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await storage.set(newId, fileStream, meta, timeLimit);
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@ -6,6 +6,7 @@ import Archive from '../../../app/archive';
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import { b64ToArray } from '../../../app/utils';
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import { blobStream, concatStream } from '../../../app/streams';
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import { decryptStream, encryptStream } from '../../../app/ece.js';
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import { encryptedSize } from '../../../app/utils';
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const rs = 36;
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@ -101,4 +102,10 @@ describe('Streaming', function() {
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assert.deepEqual(result, decrypted);
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});
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});
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describe('encryptedSize', function() {
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it('matches the size of an encrypted buffer', function() {
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assert.equal(encryptedSize(buffer.length, rs), encrypted.length);
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});
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});
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});
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