mirror of
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270 lines
9.1 KiB
JavaScript
270 lines
9.1 KiB
JavaScript
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Google Safe Browsing.
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*
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* The Initial Developer of the Original Code is Google Inc.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Niels Provos <niels@google.com> (original author)d
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* Fritz Schneider <fritz@google.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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// A warden that knows how to register lists with a listmanager and keep them
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// updated if necessary. The ListWarden also provides a simple interface to
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// check if a URL is evil or not. Specialized wardens like the PhishingWarden
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// inherit from it.
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//
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// Classes that inherit from ListWarden are responsible for calling
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// enableTableUpdates or disableTableUpdates. This usually entails
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// registering prefObservers and calling enable or disable in the base
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// class as appropriate.
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//
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/**
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* Abtracts the checking of user/browser actions for signs of
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* phishing.
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*
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* @constructor
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*/
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function PROT_ListWarden() {
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this.debugZone = "listwarden";
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var listManager = Cc["@mozilla.org/url-classifier/listmanager;1"]
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.getService(Ci.nsIUrlListManager);
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this.listManager_ = listManager;
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// Once we register tables, their respective names will be listed here.
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this.blackTables_ = [];
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this.whiteTables_ = [];
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}
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PROT_ListWarden.IN_BLACKLIST = 0
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PROT_ListWarden.IN_WHITELIST = 1
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PROT_ListWarden.NOT_FOUND = 2
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/**
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* Tell the ListManger to keep all of our tables updated
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*/
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PROT_ListWarden.prototype.enableBlacklistTableUpdates = function() {
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for (var i = 0; i < this.blackTables_.length; ++i) {
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this.listManager_.enableUpdate(this.blackTables_[i]);
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}
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}
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/**
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* Tell the ListManager to stop updating our tables
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*/
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PROT_ListWarden.prototype.disableBlacklistTableUpdates = function() {
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for (var i = 0; i < this.blackTables_.length; ++i) {
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this.listManager_.disableUpdate(this.blackTables_[i]);
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}
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}
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/**
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* Tell the ListManager to update whitelist tables. They may be enabled even
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* when other updates aren't, for performance reasons.
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*/
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PROT_ListWarden.prototype.enableWhitelistTableUpdates = function() {
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for (var i = 0; i < this.whiteTables_.length; ++i) {
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this.listManager_.enableUpdate(this.whiteTables_[i]);
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}
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}
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/**
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* Tell the ListManager to stop updating whitelist tables.
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*/
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PROT_ListWarden.prototype.disableWhitelistTableUpdates = function() {
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for (var i = 0; i < this.whiteTables_.length; ++i) {
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this.listManager_.disableUpdate(this.whiteTables_[i]);
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}
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}
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/**
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* Register a new black list table with the list manager
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* @param tableName - name of the table to register
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* @returns true if the table could be registered, false otherwise
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*/
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PROT_ListWarden.prototype.registerBlackTable = function(tableName) {
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var result = this.listManager_.registerTable(tableName, false);
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if (result) {
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this.blackTables_.push(tableName);
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}
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return result;
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}
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/**
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* Register a new white list table with the list manager
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* @param tableName - name of the table to register
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* @returns true if the table could be registered, false otherwise
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*/
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PROT_ListWarden.prototype.registerWhiteTable = function(tableName) {
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var result = this.listManager_.registerTable(tableName, false);
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if (result) {
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this.whiteTables_.push(tableName);
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}
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return result;
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}
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/**
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* Method that looks up a url on the whitelist.
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*
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* @param url The URL to check
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* @param callback Function with a single param:
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* PROT_ListWarden.IN_BLACKLIST, PROT_ListWarden.IN_WHITELIST,
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* or PROT_ListWarden.NOT_FOUND
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*/
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PROT_ListWarden.prototype.isWhiteURL = function(url, callback) {
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(new MultiTableQuerier(url,
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this.whiteTables_,
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[] /* no blacklists */,
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callback)).run();
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}
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/**
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* Method that looks up a url in both the white and black lists.
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*
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* If there is conflict, the white list has precedence over the black list.
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*
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* This is tricky because all database queries are asynchronous. So we need
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* to chain together our checks against white and black tables. We use
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* MultiTableQuerier (see below) to manage this.
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*
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* @param url URL to look up
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* @param callback Function with a single param:
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* PROT_ListWarden.IN_BLACKLIST, PROT_ListWarden.IN_WHITELIST,
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* or PROT_ListWarden.NOT_FOUND
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*/
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PROT_ListWarden.prototype.isEvilURL = function(url, callback) {
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(new MultiTableQuerier(url,
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this.whiteTables_,
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this.blackTables_,
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callback)).run();
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}
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/**
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* This class helps us query multiple tables even though each table check
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* is asynchronous. It provides callbacks for each listManager lookup
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* and decides whether we need to continue querying or not. After
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* instantiating the method, use run() to invoke.
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*
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* @param url String The url to check
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* @param whiteTables Array of strings with each white table name
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* @param blackTables Array of strings with each black table name
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* @param callback Function to call with result
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* PROT_ListWarden.IN_BLACKLIST, PROT_ListWarden.IN_WHITELIST,
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* or PROT_ListWarden.NOT_FOUND
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*/
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function MultiTableQuerier(url, whiteTables, blackTables, callback) {
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this.debugZone = "multitablequerier";
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this.url_ = url;
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this.whiteTables_ = whiteTables;
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this.blackTables_ = blackTables;
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this.whiteIdx_ = 0;
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this.blackIdx_ = 0;
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this.callback_ = callback;
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this.listManager_ = Cc["@mozilla.org/url-classifier/listmanager;1"]
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.getService(Ci.nsIUrlListManager);
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}
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/**
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* We first query the white tables in succession. If any contain
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* the url, we stop. If none contain the url, we query the black tables
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* in succession. If any contain the url, we call callback and
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* stop. If none of the black tables contain the url, then we just stop
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* (i.e., it's not black url).
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*/
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MultiTableQuerier.prototype.run = function() {
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var whiteTable = this.whiteTables_[this.whiteIdx_];
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var blackTable = this.blackTables_[this.blackIdx_];
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if (whiteTable) {
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//G_Debug(this, "Looking in whitetable: " + whiteTable);
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++this.whiteIdx_;
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this.listManager_.safeExists(whiteTable, this.url_,
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BindToObject(this.whiteTableCallback_,
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this));
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} else if (blackTable) {
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//G_Debug(this, "Looking in blacktable: " + blackTable);
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++this.blackIdx_;
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this.listManager_.safeExists(blackTable, this.url_,
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BindToObject(this.blackTableCallback_,
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this));
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} else {
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// No tables left to check, so we quit.
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G_Debug(this, "Not found in any tables: " + this.url_);
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this.callback_(PROT_ListWarden.NOT_FOUND);
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// Break circular ref to callback.
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this.callback_ = null;
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this.listManager_ = null;
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}
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}
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/**
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* After checking a white table, we return here. If the url is found,
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* we can stop. Otherwise, we call run again.
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*/
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MultiTableQuerier.prototype.whiteTableCallback_ = function(isFound) {
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//G_Debug(this, "whiteTableCallback_: " + isFound);
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if (!isFound)
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this.run();
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else {
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G_Debug(this, "Found in whitelist: " + this.url_)
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this.callback_(PROT_ListWarden.IN_WHITELIST);
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// Break circular ref to callback.
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this.callback_ = null;
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this.listManager_ = null;
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}
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}
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/**
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* After checking a black table, we return here. If the url is found,
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* we can call the callback and stop. Otherwise, we call run again.
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*/
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MultiTableQuerier.prototype.blackTableCallback_ = function(isFound) {
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//G_Debug(this, "blackTableCallback_: " + isFound);
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if (!isFound) {
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this.run();
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} else {
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// In the blacklist, must be an evil url.
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G_Debug(this, "Found in blacklist: " + this.url_)
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this.callback_(PROT_ListWarden.IN_BLACKLIST);
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// Break circular ref to callback.
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this.callback_ = null;
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this.listManager_ = null;
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}
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}
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