Secure Visitor Posting for WordPress

Normally, when visitors post a comment to your site, specific types of client data are associated with the request. Commonly, a client will provide a user agent, a referrer, and a host header. When any of these variables is absent, there is good reason to suspect foul play. For example, virtually all browsers provide some sort of user-agent name to identify themselves. Conversely, malicious scripts directly posting spam and other payloads to your site frequently operate without specifying a user […] Continue reading »

HTAccess Spring Cleaning 2009

Just like last year, this Spring I have been taking some time to do some general maintenance here at Perishable Press. This includes everything from fixing broken links and resolving errors to optimizing scripts and eliminating unnecessary plugins. I’ll admit, this type of work is often quite dull, however I always enjoy the process of cleaning up my HTAccess files. In this post, I share some of the changes made to my HTAccess files and explain the reasoning behind each […] Continue reading »

4G Series: The Ultimate Referrer Blacklist, Featuring Over 8000 Banned Referrers

You have seen user-agent blacklists, IP blacklists, 4G Blacklists, and everything in between. Now, in this article, for your sheer and utter amusement, I present a collection of over 8000 blacklisted referrers. Shortcut: skip the article and jump to Disclaimer and Download » Referrer Spam Sucks For the uninitiated, in teh language of teh Web, a referrer is the online resource from whence a visitor happened to arrive at your site. For example, if Johnny the Wonder Parrot was visiting the […] Continue reading »

4G Series: The Ultimate User-Agent Blacklist, Featuring Over 1200 Bad Bots

As discussed in my recent article, Eight Ways to Blacklist with Apache’s mod_rewrite, one method of stopping spammers, scrapers, email harvesters, and malicious bots is to blacklist their associated user agents. Apache enables us to target bad user agents by testing the user-agent string against a predefined blacklist of unwanted visitors. Any bot identifying itself as one of the blacklisted agents is immediately and quietly denied access. While this certainly isn’t the most effective method of securing your site against […] Continue reading »

The Perishable Press 4G Blacklist

At last! After many months of collecting data, crafting directives, and testing results, I am thrilled to announce the release of the 4G Blacklist! The 4G Blacklist is a next-generation protective firewall that secures your site against a wide range of automated attacks and other malicious activity. Continue reading »

Building the Perishable Press 4G Blacklist

Last year, after much research and discussion, I built a concise, lightweight security strategy for Apache-powered websites. Prior to the development of this strategy, I relied on several extensive blacklists to protect my sites against malicious user agents and IP addresses. Unfortunately, these mega-lists eventually became unmanageable and ineffective. As increasing numbers of attacks hit my server, I began developing new techniques for defending against external threats. This work soon culminated in the release of a “next-generation” blacklist that works […] Continue reading »

Controlling Proxy Access with HTAccess

In my recent article on blocking proxy servers, I explain how to use HTAccess to deny site access to a wide range of proxy servers. The method works great, but some readers want to know how to allow access for specific proxy servers while denying access to as many other proxies as possible. Fortunately, the solution is as simple as adding a few lines to my original proxy-blocking method. Specifically, we may allow any requests coming from our whitelist of […] Continue reading »

Redirect All (Broken) Links from any Domain via HTAccess

Here’s the scene: you have been noticing a large number of 404 requests coming from a particular domain. You check it out and realize that the domain in question has a number of misdirected links to your site. The links may resemble legitimate URLs, but because of typographical errors, markup errors, or outdated references, they are broken, leading to nowhere on your site and producing a nice 404 error for every request. Ugh. Or, another painful scenario would be a […] Continue reading »

Better Default Directory Views with HTAccess

Beautify your default directory listings! Displaying index-less file views is a great way to share files, but the drab, bare-bones interface is difficult to integrate into existing designs. While there are many scripts available to customize the appearance and functionality of default directory navigation, most of these methods are either too complicated, too invasive, or otherwise insufficient for expedient directory styling. In this comprehensive tutorial, you will learn how to use the built-in functionality of Apache’s mod_autoindex module to style […] Continue reading »

Blacklist Candidate 2008-10-19

Welcome to the Perishable Press “Blacklist Candidate” series. In this post, we continue our new tradition of exposing, humiliating and banishing spammers, crackers and other worthless scumbags.. From time to time on the show, a contestant places a bid that is so absurd and so asinine that you literally laugh out loud, point at the monitor, and openly ridicule the pathetic loser. On such occasions, even the host of the show will laugh and mock the idiocy. Of course, this […] Continue reading »

Redirect All Requests for a Nonexistent File to the Actual File

In my previous article on redirecting 404 requests for favicon files, I presented an HTAccess technique for redirecting all requests for nonexistent favicon.ico files to the actual file located in the site’s web-accessible root directory: # REDIRECT FAVICONZ <ifmodule mod_rewrite.c> RewriteCond %{THE_REQUEST} favicon.ico [NC] RewriteRule (.*) http://domain.tld/favicon.ico [R=301,L] </ifmodule> As discussed in the article, this code is already in effect here at Perishable Press, as may be seen by clicking on any of the following links: Update: I’ve removed the […] Continue reading »

Stop the Madness: Redirect those Ridiculous Favicon 404 Requests

For the last several months, I have been seeing an increasing number of 404 errors requesting “favicon.ico” appended onto various URLs: http://example.com/favicon.ico http://example.com/2007/06/12/favicon.ico http://example.com/2007/09/25/absolute-horizontal-and-vertical-centering-via-css/favicon.ico http://example.com/2007/08/01/temporary-site-redirect-for-visitors-during-site-updates/favicon.ico http://example.com/2007/01/16/maximum-and-minimum-height-and-width-in-internet-explorer/favicon.ico When these errors first began appearing in the logs several months ago, I didn’t think too much of it — “just another idiot who can’t find my site’s favicon..” As time went on, however, the frequency and variety of these misdirected requests continued to increase. A bit frustrating perhaps, but not serious enough to […] Continue reading »

Blacklist Candidate Number 2008-05-31

Welcome to the Perishable Press “Blacklist Candidate” series. In this post, we continue our new tradition of exposing, humiliating and banishing spammers, crackers and other worthless scumbags.. Just under the wire! Even so, this month’s official Blacklist-Candidate article may be the last monthly installment of the series. Although additional BC articles may appear in the future, it is unlikely that they will continue as a regular monthly feature. Oh sure, I see the tears streaming down your face, but think […] Continue reading »

Series Summary: Building the 3G Blacklist

In the now-complete series, Building the 3G Blacklist, I share insights and discoveries concerning website security and protection against malicious attacks. Each article in the series focuses on unique blacklist strategies designed to protect sites transparently, effectively, and efficiently. The five articles culminate in the release of the next generation 3G Blacklist. Here is a quick summary of the entire Building the 3G Blacklist series: Continue reading »

Improve Security by Protecting .htaccess

As you know, HTAccess files are powerful tools for manipulating site performance and functionality. Protecting your site’s HTAccess files is critical to maintaining a secure environment. Fortunately, preventing access to your HTAccess files is very easy. Let’s have a look.. Continue reading »

Perishable Press 3G Blacklist

After much research and discussion, I have developed a concise, lightweight security strategy for Apache-powered websites. Prior to the development of this strategy, I relied on several extensive blacklists to protect my sites against malicious user agents and IP addresses. Over time, these mega-lists became unmanageable and ineffective. As increasing numbers of attacks hit my server, I began developing new techniques for defending against external threats. This work soon culminated in the release of a “next-generation” blacklist that works by […] Continue reading »

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