security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Code Releases Activity

Added option to store data for persistent rng.

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Fixes #102.
This commit is contained in:
kkapsner 2017-02-10 17:37:35 +01:00
parent 3b14e56537
commit a8611230b1
7 changed files with 99 additions and 8 deletions
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39
lib/main.js
View file

@ -39,18 +39,49 @@
});
// persistent rng
const persistentRnd = Object.create(null);
var persistentRnd = Object.create(null);
try {
let storedData = JSON.parse(prefs.persistentRndStorage);
for (var domain in storedData){
var value = storedData[domain];
if (
Array.isArray(value) &&
value.length === 128 &&
value.every(function(value){return typeof value === "number" && value >= 0 && value < 256;})
){
persistentRnd[domain] = value;
}
}
}
catch(e){}
processes.port.on("canvasBlocker-new-domain-rnd", function(process, data){
processes.port.emit("canvasBlocker-set-domain-rnd", data);
persistentRnd[data.domain] = data.rnd;
if (prefs.storePersistentRnd){
prefs.persistentRndStorage = JSON.stringify(persistentRnd);
}
});
processes.on("attach", function(process){
processes.forEvery(function(process){
if (process.isRemote){
for (var name in persistentRnd){
process.port.emit("canvasBlocker-set-domain-rnd", {domain: name, rnd: persistentRnd[name]});
for (var domain in persistentRnd){
process.port.emit("canvasBlocker-set-domain-rnd", {domain, rnd: persistentRnd[domain]});
}
}
});
preferences.on("storePersistentRnd", function(){
if (prefs.storePersistentRnd){
prefs.persistentRndStorage = JSON.stringify(persistentRnd);
}
else {
prefs.persistentRndStorage = "";
}
});
preferences.on("clearPersistentRnd", function(){
persistentRnd = Object.create(null);
prefs.persistentRndStorage = "";
processes.port.emit("canvasBlocker-clear-domain-rnd");
});
// show release notes
var data = require("sdk/self").data;

8
lib/randomSupplies.js
View file

@ -17,19 +17,23 @@
return window.location.host;
}
const getPersistentRnd = (function(){
var persistentRnd = Object.create(null);
const {process} = require("sdk/remote/child");
process.port.on("canvasBlocker-set-domain-rnd", function(process, {domain, rnd}){
persistentRnd[domain] = new Uint8Array(rnd);
});
process.port.on("canvasBlocker-clear-domain-rnd", function(){
persistentRnd = Object.create(null);
});
const persistentRnd = Object.create(null);
return function getPersistentRnd(window){
var domain = getDomain(window);
if (!persistentRnd[domain]){
// create the (sub-)domains random numbers if not existing
persistentRnd[domain] = new Uint8Array(128);
window.crypto.getRandomValues(persistentRnd[domain]);
process.port.emit("canvasBlocker-new-domain-rnd", {domain, rnd: persistentRnd[domain]});
process.port.emit("canvasBlocker-new-domain-rnd", {domain, rnd: Array.from(persistentRnd[domain])});
}
return persistentRnd[domain];
}