WEB S IT E S ECU RIT Y in Font

Create QR-Code in Font WEB S IT E S ECU RIT Y

CHAPTER 11 WEB S IT E S ECU RIT Y
Generating QR-Code In None
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$outside_Data =~ /regex/ //where some regular expression is to be used $clean_data=$1 //Scalar variable contains regular expression from the above The following code will convert specified information into regular expressions to make them more difficult for bots to decipher: < php function Convert2Regex ($text) { $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_\+.~# &//=]+)', '<a href="\\1">\\1</a>', $text); $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_\+.~# &//=]+)', '\\1<a href="http://\\2">\\2</a>', $text); $text = eregi_replace('([_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.)+[a-z]{2,3})', '<a href="mailto:\\1">\\1</a>', $text); return $text; } $text = "yourmail@yourdomain.com"; echo Convert2Regex($text); echo "<br /><br />"; $text = "http://www.yourdomain.com"; echo Convert2Regex($text); echo "<br /><br />"; $text = "ftp://ftp.yourdomain.com"; echo Convert2Regex($text); > Next, you would pass the $clean_data variable into your scripts. Be mindful that using these lines of code will not guarantee security in situations where you re protecting your Perl scripts with the T option in Perl. If you use the Perl command line to test syntax, you can still do so by using perl cT scriptname.pl.
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Securing robots.txt
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If you have a web site, you can assume that search engines will find it and add the text and code of your site into their extensive catalog of sites for users to be able to search. Many administrators do not want their sites to appear in search engines for a variety of reasons. The robots.txt file is a simple text file script at the root of your web host that tells a robot whether it has access to a certain file or directory. It is designed for companies that want to keep their data from being scanned by bots, preventing search engines from scanning or crawling their web site. It s flexible in that different rules can be specified based on the robot s user agent. A sample robots.txt is as follows: User-agent: * Disallow: /secret-files/ This simple file tells all robots not to enter the /secret-files folder.
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Generate British Royal Mail 4-State Customer Code In None
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C HAPT ER 11 WEB S ITE S ECURITY
QR Code JIS X 0510 Creator In VS .NET
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A more complex robots.txt or robots(AllowRoot).txt file looks like this: User-agent: Disallow: Disallow: Disallow: Disallow: Disallow: Disallow: Disallow: Disallow: Disallow: Disallow: Disallow: Disallow: Disallow: * /_vti_bin/ /clienthelp/ /exchweb/ /remote/ /tsweb/ /aspnet_client/ /images/ /_private/ /_vti_cnf/ /_vti_log/ /_vti_pvt/ /_vti_script/ /_vti_txt/
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Allow All traffic: User-agent: * Disallow: /
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Paint UCC - 12 In .NET Framework
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Blocking Hosts Based on robots.txt
Make EAN-13 In Visual Studio .NET
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Read ANSI/AIM Code 39 In Visual Basic .NET
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This is all well and good, and most robots such as those from Google, Yahoo, and MSN respect your rules, but what happens when a robot blatantly ignores your rules The simple answer is, whatever it wants. Since it s up to the robot to obey or ignore the rules, any disreputable robot can download your entire site. The solution to this problem is to proactively block wayward robots. There are a few different ways to do this, such as blocking known bad robot user agents and blocking IPs. Blocking certain user agents is easy, but it s also easy for the user agent to spoof itself, so you ll find that you have to continuously update your list of bad user agents. Blocking IP addresses is effective too, but you ll also need to consistently update your blocked IP list. The best solution involves a combination of techniques that, once implemented, requires little or no maintenance and lays a trap for bad robots. First, put a hidden link into the main page of your site. This hidden link is a zero-by-zeropixel image that links to a script within /secret-files/. <a href="/secret-files/robot.cgi"><img border="0" width="0" length="0" src="images/ spacer.gif"> Since this image isn t viewable in a browser, the only way it s ever going to be accessed is if a robot is crawling your site. Since your robots.txt file is blocking access to that folder, the only time this script will actually get called is if a robot is crawling the site while ignoring robots.txt. Once the script within /secret-files/ is run, it blocks the user s IP.
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Matrix Creation In Java
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Printing UCC.EAN - 128 In Java
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UCC-128 Generation In .NET
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