262 строки
9.8 KiB
JavaScript
262 строки
9.8 KiB
JavaScript
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** 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 Thunderbird Phishing Dectector
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Scott MacGregor <mscott@mozilla.org>
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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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// Dependencies:
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// gPrefBranch, gBrandBundle, gMessengerBundle should already be defined
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// gatherTextUnder from utilityOverlay.js
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const kPhishingNotSuspicious = 0;
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const kPhishingWithIPAddress = 1;
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const kPhishingWithMismatchedHosts = 2;
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//////////////////////////////////////////////////////////////////////////////
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// isEmailScam --> examines the message currently loaded in the message pane
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// and returns true if we think that message is an e-mail scam.
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// Assumes the message has been completely loaded in the message pane (i.e. OnMsgParsed has fired)
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// aUrl: nsIURI object for the msg we want to examine...
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//////////////////////////////////////////////////////////////////////////////
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function isMsgEmailScam(aUrl)
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{
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var isEmailScam = false;
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if (!aUrl || !gPrefBranch.getBoolPref("mail.phishing.detection.enabled"))
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return isEmailScam;
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// Ignore nntp and RSS messages
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// nsIMsgMailNewsUrl.folder can throw an error, especially if we are opening
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// a .eml message.
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try {
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var serverType = aUrl.folder.server.type;
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if (serverType == 'nntp' || serverType == 'rss')
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return isEmailScam;
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} catch (ex) {}
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// loop through all of the link nodes in the message's DOM, looking for phishing URLs...
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var msgDocument = document.getElementById('messagepane').contentDocument;
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var index;
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// examine all links...
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var linkNodes = msgDocument.links;
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for (index = 0; index < linkNodes.length && !isEmailScam; index++)
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isEmailScam = isPhishingURL(linkNodes[index], true);
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// if an e-mail contains a non-addressbook form element, then assume the message is
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// a phishing attack. Legitimate sites should not be using forms inside of e-mail
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if (!isEmailScam)
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{
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var forms = msgDocument.getElementsByTagName("form");
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for (index = 0; index < forms.length && !isEmailScam; index++)
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isEmailScam = forms[index].action != "" && !/^addbook:/.test(forms[index].action);
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}
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// we'll add more checks here as our detector matures....
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return isEmailScam;
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}
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//////////////////////////////////////////////////////////////////////////////
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// isPhishingURL --> examines the passed in linkNode and returns true if we think
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// the URL is an email scam.
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// aLinkNode: the link node to examine
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// aSilentMode: don't prompt the user to confirm
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// aHref: optional href for XLinks
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//////////////////////////////////////////////////////////////////////////////
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function isPhishingURL(aLinkNode, aSilentMode, aHref)
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{
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if (!gPrefBranch.getBoolPref("mail.phishing.detection.enabled"))
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return false;
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var phishingType = kPhishingNotSuspicious;
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var href = aHref || aLinkNode.href;
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if (!href)
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return false;
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var linkTextURL = {};
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var unobscuredHostName = {};
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var isPhishingURL = false;
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var ioService = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);
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var hrefURL = ioService.newURI(href, null, null);
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// only check for phishing urls if the url is an http or https link.
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// this prevents us from flagging imap and other internally handled urls
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if (hrefURL.schemeIs('http') || hrefURL.schemeIs('https'))
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{
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unobscuredHostName.value = hrefURL.host;
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if (hostNameIsIPAddress(hrefURL.host, unobscuredHostName) && !isLocalIPAddress(unobscuredHostName))
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phishingType = kPhishingWithIPAddress;
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else if (misMatchedHostWithLinkText(aLinkNode, hrefURL, linkTextURL))
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phishingType = kPhishingWithMismatchedHosts;
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isPhishingURL = phishingType != kPhishingNotSuspicious;
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if (!aSilentMode && isPhishingURL) // allow the user to override the decision
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isPhishingURL = confirmSuspiciousURL(phishingType, unobscuredHostName.value);
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}
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return isPhishingURL;
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}
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//////////////////////////////////////////////////////////////////////////////
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// helper methods in support of isPhishingURL
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//////////////////////////////////////////////////////////////////////////////
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function misMatchedHostWithLinkText(aLinkNode, aHrefURL, aLinkTextURL)
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{
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var linkNodeText = gatherTextUnder(aLinkNode);
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// gatherTextUnder puts a space between each piece of text it gathers,
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// so strip the spaces out (see bug 326082 for details).
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linkNodeText = linkNodeText.replace(/ /g, "");
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// only worry about http and https urls
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if (linkNodeText)
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{
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// does the link text look like a http url?
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if (linkNodeText.search(/(^http:|^https:)/) != -1)
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{
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var ioService = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);
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var linkTextURL = ioService.newURI(linkNodeText, null, null);
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aLinkTextURL.value = linkTextURL;
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// compare hosts, but ignore possible www. prefix
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return !(aHrefURL.host.replace(/^www\./, "") == aLinkTextURL.value.host.replace(/^www\./, ""));
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}
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}
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return false;
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}
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// returns true if the hostName is an IP address
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// if the host name is an obscured IP address, returns the unobscured host
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function hostNameIsIPAddress(aHostName, aUnobscuredHostName)
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{
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// TODO: Add Support for IPv6
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var index;
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// scammers frequently obscure the IP address by encoding each component as octal, hex
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// or in some cases a mix match of each. The IP address could also be represented as a DWORD.
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// break the IP address down into individual components.
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var ipComponents = aHostName.split(".");
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// if we didn't find at least 4 parts to our IP address it either isn't a numerical IP
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// or it is encoded as a dword
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if (ipComponents.length < 4)
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{
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// Convert to a binary to test for possible DWORD.
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var binaryDword = parseInt(aHostName).toString(2);
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if (isNaN(binaryDword))
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return false;
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// convert the dword into its component IP parts.
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ipComponents =
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[
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(aHostName >> 24) & 255,
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(aHostName >> 16) & 255,
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(aHostName >> 8) & 255,
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(aHostName & 255)
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];
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}
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else
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{
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for (index = 0; index < ipComponents.length; ++index)
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{
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// by leaving the radix parameter blank, we can handle IP addresses
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// where one component is hex, another is octal, etc.
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ipComponents[index] = parseInt(ipComponents[index]);
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}
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}
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// make sure each part of the IP address is in fact a number
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for (index = 0; index < ipComponents.length; ++index)
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if (isNaN(ipComponents[index])) // if any part of the IP address is not a number, then we can safely return
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return false;
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// only set aUnobscuredHostName if we are looking at an IPv4 host name
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var hostName = ipComponents.join(".");
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if (isIPv4HostName(hostName))
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{
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aUnobscuredHostName.value = hostName;
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return true;
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}
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return false;
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}
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function isIPv4HostName(aHostName)
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{
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var ipv4HostRegExp = new RegExp(/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/); // IPv4
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// treat 0.0.0.0 as an invalid IP address
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return ipv4HostRegExp.test(aHostName) && aHostName != '0.0.0.0';
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}
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// returns true if the user confirms the URL is a scam
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function confirmSuspiciousURL(aPhishingType, aSuspiciousHostName)
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{
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var brandShortName = gBrandBundle.getString("brandShortName");
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var titleMsg = gMessengerBundle.getString("confirmPhishingTitle");
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var dialogMsg;
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switch (aPhishingType)
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{
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case kPhishingWithIPAddress:
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case kPhishingWithMismatchedHosts:
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dialogMsg = gMessengerBundle.getFormattedString("confirmPhishingUrl" + aPhishingType, [brandShortName, aSuspiciousHostName], 2);
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break;
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default:
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return false;
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}
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const nsIPS = Components.interfaces.nsIPromptService;
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var promptService = Components.classes["@mozilla.org/embedcomp/prompt-service;1"].getService(nsIPS);
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var buttons = nsIPS.STD_YES_NO_BUTTONS + nsIPS.BUTTON_POS_1_DEFAULT;
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return promptService.confirmEx(window, titleMsg, dialogMsg, buttons, "", "", "", "", {}); /* the yes button is in position 0 */
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}
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// returns true if the IP address is a local address.
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function isLocalIPAddress(unobscuredHostName)
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{
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var ipComponents = unobscuredHostName.value.split(".");
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return ipComponents[0] == 10 ||
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(ipComponents[0] == 192 && ipComponents[1] == 168) ||
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(ipComponents[0] == 169 && ipComponents[1] == 254) ||
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(ipComponents[0] == 172 && ipComponents[1] >= 16 && ipComponents[1] < 32);
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}
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