/usr/share/xul-ext/lightbeam/resources/lightbeam/lib/connection.js is in xul-ext-lightbeam 1.2.1+dfsg-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// Connection object. This module may try to do too many things.
//
// Convert an HTTP request (channel) to a loggable, visualizable connection
// object, if possible
const {
Cc, Ci, Cr
} = require('chrome');
const {
on, off, emit
} = require('sdk/event/core');
const {
data
} = require("sdk/self");
const addonUrl = data.url("index.html");
const persist = require("./persist");
const {
setTimeout
} = require("sdk/timers");
const ss = require('sdk/simple-storage');
// An array of connection objects serialized to an array.
var connBatch = [];
const connBatchSize = 200;
var eTLDSvc = Cc["@mozilla.org/network/effective-tld-service;1"].
getService(Ci.nsIEffectiveTLDService);
const {
getTabForChannel
} = require('./tab/utils');
exports.Connection = Connection;
exports.addConnection = addConnection;
function addConnection(connection) {
connBatch.push(connection.toLog());
if (connBatch.length == connBatchSize) {
flushToStorage();
}
console.debug("got", connBatch.length, "connections");
}
exports.getAllConnections = function getAllConnections() {
console.debug("got", connBatch.length, "buffered connections", ss.storage.connections.length, "persisted connections");
return ss.storage.connections.concat(connBatch);
};
function excludePrivateConnections(connections) {
return connections.filter(function (connection) {
return !connection[Connection.FROM_PRIVATE_MODE];
});
}
function flushToStorage() {
console.debug("flushing", connBatch.length, "buffered connections");
persist.storeConnections(excludePrivateConnections(connBatch));
connBatch.length = 0;
}
// Every 5 minutes, flush to storage.
setTimeout(flushToStorage, 5 * 60 * 1000);
// Get eTLD + 1 (e.g., example.com from foo.example.com)
function getDomain(host) {
try {
return eTLDSvc.getBaseDomainFromHost(host);
} catch (e
if e.result === Cr.NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS) {
return false;
} catch (e
if e.result === Cr.NS_ERROR_HOST_IS_IP_ADDRESS) {
return false;
} catch (e) {
console.error('getDomain(): unexpected error: ' + host + ': ' + e);
throw e;
}
}
Connection.getDomain = getDomain; // make it part of what we export
Connection.reset = function () {
connBatch.length = 0;
};
// Get subdomain (e.g., foo from foo.example.com)
function getSubdomain(host) {
var domain = getDomain(host);
return host.slice(0, host.length - domain.length);
}
function Connection() {}
// subject comes from events.on("http-on-modify-request");
Connection.fromSubject = function (subject) {
var conn = new Connection();
conn.restoreFromSubject(subject);
return conn;
};
// Functions below may include legacy code from the first version of Collusion.
// Find the page the URL was originally loaded from to determine whether this
// happened in first or third-party context.
function getAjaxRequestHeader(channel) {
var header = null;
try {
header = channel.getRequestHeader('X-Requested-With').toLowerCase() === 'xmlhttprequest';
} catch (e) {
if (e.name === 'NS_ERROR_NOT_AVAILABLE') {
/* header not found, do nothing */
} else {
console.error('what is this? ' + Object.keys(e).join(','));
throw e;
}
}
return header;
}
// Does this make sense from http-on-examine-response? The response will have
// Set-Cookie headers, the request will have Cookie headers. We should
// investigate nsIHttpChannel to make sure that the response channel has the
// original request headers.
function hasCookie(channel) {
try {
return !!channel.getRequestHeader('Cookie');
} catch (e) {
return false;
}
}
function getProtocol(uri) {
return uri.scheme;
}
// See doc/Heuristic for determining first party-ness.md
Connection.prototype.restoreFromSubject = function (event) {
// Check to see if this is in fact a third-party connection, if not, return
var channel = event.subject.QueryInterface(Ci.nsIHttpChannel);
// The referrer may not be set properly, especially in the case where HTTPS
// includes HTTP where the referrer is stripped due to mixed-content
// attacks. Also it doesn't work for RTC or WebSockets, but since we are
// only examining HTTP requests right now, that's all right.
var source = channel.referrer;
var target = channel.URI;
var targetDomain = getDomain(target.host);
var tab = null;
try {
tab = getTabForChannel(channel);
} catch (e) {
console.debug('EXCEPTION CAUGHT: No tab for connection');
tab = null;
}
var isAjax = getAjaxRequestHeader(channel);
var valid = true;
var browserUri = tab ? tab.linkedBrowser.currentURI : null;
var browserSpec = browserUri && browserUri.spec;
var browserDomain = null;
try {
browserDomain = browserUri && getDomain(browserUri.host);
} catch (e) {
// chances are the URL is about:blank, which has no host and throws an exception
// console.error('Error getting host from: ' + browserUri.spec);
}
// This is probably the largest source of false positives.
var sourceVisited = !isAjax && (browserDomain === targetDomain || browserSpec === 'about:blank');
// Connection.log('browserUri ' + browserUri.spec + (sourceVisited ? ' equals ' : ' does not equal') + ' target ' + ( target && target.spec));
if (sourceVisited) {
source = target;
} else if (!source) {
// This may introduce faulty data.
// console.error('No source for target ' + target.spec + ' (' + channel.referrer + ')');
source = target; // can't have a null source
}
var sourceDomain = getDomain(source.host);
var cookie = hasCookie(channel);
var sourceProtocol = getProtocol(source);
var targetProtocol = getProtocol(target);
var isSecure = targetProtocol === 'https';
var isPrivate = tab && tab.isPrivate;
// Handle all failure conditions
if (browserUri && browserUri.spec === addonUrl) {
this.valid = false;
this.message = 'Do not record connections made by this add-on';
// console.error(this.message);
return this;
}
if (!sourceDomain) {
this.valid = false;
this.message = 'Invalid source domain: ' + source.host;
// console.error(this.message);
return this;
}
if (!targetDomain) {
this.valid = false;
this.message = 'Invalid target domain: ' + target.host;
// console.error(this.message);
return this;
}
if (target.host === 'localhost' || source.host === 'localhost') {
this.valid = false;
this.message = 'Localhost is not trackable';
// console.error(this.message);
return this;
}
if (sourceProtocol === 'http' || sourceProtocol === 'https' ||
targetProtocol === 'http' || targetProtocol === 'https') {
/* OK, do nothing */
} else {
this.valid = false;
this.message = 'Unsupported protocol: ' + sourceProtocol + ' -> ' + targetProtocol;
// console.error(this.message);
return this;
}
if (!tab) {
this.valid = false;
this.message = 'No tab found for request: ' + target.spec + ', isAjax: ' + isAjax;
// console.error(this.message);
return this;
}
// set instance values for return
this.valid = true;
this.source = sourceDomain;
this.target = targetDomain;
this.timestamp = Date.now();
this.contentType = channel.contentType || 'text/plain';
this.cookie = cookie;
// The client went to this page in a first-party context.
this.sourceVisited = sourceVisited;
this.secure = isSecure;
this.sourcePathDepth = source.path.split('/').length - 1;
this.sourceQueryDepth = source.query ? target.query.split(/;|\&/).length : 0;
this.sourceSub = getSubdomain(source.host);
this.targetSub = getSubdomain(target.host);
this.method = channel.requestMethod;
this.status = channel.responseStatus;
this.cacheable = !channel.isNoCacheResponse();
// We visualize private connections but never store them.
this.isPrivate = isPrivate;
this._sourceTab = tab; // Never logged, only for associating data with current tab
// console.error((sourceVisited ? 'site: ' : 'tracker: ') + sourceDomain + ' -> ' + targetDomain + ' (' + browserUri.spec + ')');
};
// Connection - level methods (not on instances)
// This may be supported by the addon-sdk events.on now.
Connection.on = function (eventname, handler) {
on(Connection, eventname, handler);
};
Connection.off = function (eventname) {
off(Connection, eventname);
};
Connection.emit = function (eventname, arg1, arg2, arg3) {
emit(Connection, eventname, arg1, arg2, arg3);
};
// Constants for indexes of properties in array format
Connection.SOURCE = 0;
Connection.TARGET = 1;
Connection.TIMESTAMP = 2;
Connection.CONTENT_TYPE = 3;
Connection.COOKIE = 4;
Connection.SOURCE_VISITED = 5;
Connection.SECURE = 6;
Connection.SOURCE_PATH_DEPTH = 7;
Connection.SOURCE_QUERY_DEPTH = 8;
Connection.SOURCE_SUB = 9;
Connection.TARGET_SUB = 10;
Connection.METHOD = 11;
Connection.STATUS = 12;
Connection.CACHEABLE = 13;
Connection.FROM_PRIVATE_MODE = 14;
Connection.prototype.toLog = function () {
if (!this.valid) {
throw new Error('Do not log invalid connections: ' + this.message);
}
var theLog = [
this.source,
this.target,
this.timestamp.valueOf(),
this.contentType,
this.cookie,
this.sourceVisited,
this.secure,
this.sourcePathDepth,
this.sourceQueryDepth,
this.sourceSub,
this.targetSub,
this.method,
this.status,
this.cacheable,
this._sourceTab.isPrivate
];
if (this.isPrivate) {
theLog.push(this.isPrivate);
}
return theLog;
};
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