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background.js
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background.js
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/*
Main background Form Lock script.
*/
alert("Thank you for trying FormLock!");
// BLOCKS THIRD-PARTY DOMAINS EXCEPT THE LOCK
// TODO: change global blocking to per tab/frame based!
var lockDomains = [];
//var lockTab = null;
var blocked = [];
// TODO: analyze the "requestBody"
chrome.webRequest.onBeforeRequest.addListener(
function(details) {
var fCancel = false;
if (lockDomains.length > 0) {
fCancel = true;
var current_domain = getRootDomain(getHostname(details.url));
if (lockDomains.indexOf(current_domain) !== -1) {
fCancel = false;
}
if (fCancel) {
//console.log(details.url);
blocked.push(details.url);
}
}
return {cancel: fCancel};
},
{urls: ["<all_urls>"]},
["blocking"]
);
// CLEARING STORAGES OF POTENTIAL LEAKS
// TODO: may try to restore previous values of updated cookies
var started = null;
function clearNewData(callback) {
if (started !== null) {
chrome.browsingData.remove({
"since": started
}, {
"appcache": true,
"cache": true,
"cookies": true,
"downloads": true,
"fileSystems": true,
"formData": true,
"history": true,
"indexedDB": true,
"localStorage": true,
"pluginData": true,
"passwords": true,
"webSQL": true
}, callback);
}
}
// CREATES THE CONTEXT MENU AND ITS CLICK HANDLERS
chrome.runtime.onInstalled.addListener(function() {
// (1) Process the menu clicks
var clickHandler = function(info, tab) {
var url = info.frameUrl ? info.frameUrl : info.pageUrl;
// Explain the form risks option
if (info.menuItemId === "explainRisks") {
chrome.tabs.sendMessage(tab.id, {"msg": "FLGetClickedForm", "url": url}, function(payload) {
if (payload !== null) {
var violation = "";
var global_url = getRootDomain(getHostname(tab.url));
var current_url = getRootDomain(payload.domain);
if (global_url !== current_url) violation += "> Third-party: " + current_url + "\n";
if (payload.method === "get") violation += "> Submit with GET\n";
if (violation === "") violation = "Looks safe.";
alert(violation);
}
});
}
// Set the lock for one domain allowed
if (info.menuItemId === "lock") {
if (lockDomains.length > 0) {
// Remove LOCK
var msg = "Unlocked. Third-party requests blocked " + blocked.length + ":\n";
for (b in blocked) {
msg += getHostname(blocked[b]) + "\n";
}
chrome.browserAction.setBadgeText({text: ""});
chrome.browserAction.setTitle({title: "FormLock"});
chrome.contextMenus.update("lock", {"title": "Set LOCK"});
lockDomains = [];
blocked = [];
var oldUrl = tab.url.split("?")[0];
// TODO: close new opened tabs? or tabs of the same domain?
chrome.tabs.executeScript(tab.id, {code: "window.location.href='about:blank';"}, function(tab) {
var callback = function () {
chrome.tabs.update(tab.id, {url: oldUrl});
started = null;
alert(msg);
};
clearNewData(callback);
});
}
else {
// Set LOCK
chrome.tabs.sendMessage(tab.id, {"msg": "FLGetClickedForm", "url": url}, function(payload) {
if (payload !== null) {
started = (new Date()).getTime();
// Page url and the form url
var first = getRootDomain(getHostname(tab.url));
var second = getRootDomain(payload.domain);
lockDomains.push(first);
if (first !== second) {
lockDomains.push(second);
}
chrome.browserAction.setBadgeText({text: "on"})
chrome.browserAction.setTitle({title: lockDomains.join("\n")})
alert("Locked. Requests are allowed to only:\n" + lockDomains.join("\n"));
chrome.contextMenus.update("lock", {"title": "Remove LOCK"});
}
});
}
}
};
// (2) Register the menu items
chrome.contextMenus.create({"title": "FormLock", "contexts": ["all"], "id": "Formstery"});
chrome.contextMenus.create({"title": "Submit method: undefined", "contexts": ["all"], "parentId": "Formstery", id: "submitMethod"});
chrome.contextMenus.create({"title": "Submits to: undefined", "contexts": ["all"], "parentId": "Formstery", id: "submitTo"});
chrome.contextMenus.create({"type": "separator", "contexts": ["all"], "parentId": "Formstery"});
chrome.contextMenus.create({"title": "Explain sharing risks.", "contexts": ["all"], "parentId": "Formstery", "id": "explainRisks", "onclick": clickHandler});
chrome.contextMenus.create({"type": "separator", "contexts": ["all"], "parentId": "Formstery"});
chrome.contextMenus.create({"title": "Set LOCK", "contexts": ["all"], "parentId": "Formstery", "id": "lock", "onclick": clickHandler});
});
// UPDATES THE CONTEXT MENU WITH CURRENT FORM'S INFO
// TODO: consider reliability and usability of this approach!
chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
if (request.req === "FLClickedForm") {
chrome.contextMenus.update("submitMethod", {"title": "Submit method: " + request.method});
chrome.contextMenus.update("submitTo", {"title": "Submits to: " + getRootDomain(request.domain)});
}
});
// INTERCEPTS PAGE SCRIPTS ON A NEW URL LOADED
chrome.webNavigation.onCompleted.addListener(function(o) {
// (1) Monitoring mouse events
chrome.tabs.executeScript(o.tabId, {file: "utils.js", allFrames: true}, function(tab) {
// UTILS ->
chrome.tabs.executeScript(o.tabId, {
allFrames: true,
file: "mouse_track.js"
});
// <- UTILS
});
// (2) Highlighting risky forms
chrome.tabs.executeScript(o.tabId, {file: "utils.js", allFrames: true}, function(tab) {
// UTILS ->
chrome.tabs.get(o.tabId, function(tab) {
// Passing the tab URL
chrome.tabs.executeScript(o.tabId, {
allFrames: true,
code: "var taburl = \"" + tab.url + "\";"
},
function() {
// Main code
chrome.tabs.executeScript(o.tabId, {
allFrames: true,
file: "form_check.js"
});
});
});
// <- UTILS
});
});