}https://topspyapps.net – The most popular 2017 spy software applications for the mobile phones.

Secure Your Web Application

When it comes to application security, in addition to securing your hardware and platform, you also need to write your code securely. This article will explain how to keep your application secure and less vulnerable to hacking. The following are the best habits that a programmer can develop in order to protect his or her application from attack:

  • Input data validation
  • Guarding against XSS attacks
  • Guarding against CSRF attacks
  • Preventing SQL Injection attacks
  • Protecting the file system
  • Protecting session data
  • Proper error handling
  • Guarding included files

Input Data Validation

While designing your application, you should be striving to guard your app against bad input. The rule of thumb to follow is this: don’t trust user input. Although your app is intended for good people, there is always a chance that some bad user will try to attack your app by entering bad input. If you always validate and filter the incoming data, you can build a secure application.

Always validate data in your PHP code. If you are using JavaScript to validate user input, there is always a chance that the user might have turned off JavaScript in her browser. In this case your app will not be able to validate the input. Validating in JavaScript is okay, but to guard against these types of problems then you should re-validate the data in PHP as well too.

Guarding Against XSS Attacks

Cross-site scripting attack (XSS attack) is an attack based on code injection into vulnerable web pages. The danger is a result of accepting unchecked input data and showing it in the browser.

Suppose you have a comment form in your application that allows users to enter data, and on successful submission it shows all the comments. The user could possibly enter a comment that contains malicious JavaScript code in it. When the form is submitted, the data is sent to the server and stored into the database. Afterward, the comment is fetched from database and shown in the HTML page and the JavaScript code will run. The malicious JavaScript might redirect the user to a bad web page or a phishing website.

To protect your application from these kinds of attacks, run the input data through strip_tags() to remove any tags present in it. When showing data in the browser, apply htmlentities()function on the data.

Guarding Against CSRF Attacks

In a Cross Site Request Forgery (CSRF) attack, the attacker tricks the victim into loading sensitive information or making a transaction without their knowledge. This mainly occurs in web applications that are badly coded to trigger business logic using GET requests.

Ideally, GET requests are Idempotent in nature. Idempotency means the same page can be accessed multiple times without causing any side effects. Therefore, GET requests should be used only for accessing information and not for performing transactions.

The following example shows a how a poorly coded application unknowingly supports CSRF attacks:

<?php
if (isset($_REQUEST["name"], $_REQUEST["amount"])) {
    // your code
}
?>
Let’s assume Bob wants to perform a CSRF attack on Alice, and constructs a URL like the following and sends it to Alice in an email:
<a href="http://example.com/process.php?name=Bob&amount=1000">Visit My WebSite</a>
If Alice clicks on this link, and is logged into the website already, this request will deduct $1000 from her account and transfer it to Bob’s! Alternatively, Bob can create an image link whose src attribute points to the URL.
<img src="http://example.com/process.php?name=Bob&amount=1000" width="1" height="1"/>

The browser can’t display any image as expected, but it will still make the request using the URL which will make a transaction without notifying Alice.

The solution is to process any function that changes the database state in POST request, and avoid using $_REQUEST. Use $_GET to retrieve GET parameters, and use $_POST to retrieve POST parameters.

In addition, there should be a random token called a CSRF token associated with each POST request. When the user logins into his/her account, the application should generate a random token and store it in the session. Whenever any form is displayed to the user, the token should be present in the page as a hidden input field. Application logic must check for the token and ensure that it matches the token present in the session.

Preventing SQL Injection Attacks

To perform your database queries, you should be using PDO. With parameterized queries and prepared statements, you can prevent SQL injection.

Take a look at the following example:

&lt;?php
$sql = "SELECT * FROM users WHERE name=:name and age=:age";
$stmt = $db-&gt;prepare($sql);
$stmt-&gt;execute(array(":name" =&gt; $name, ":age" =&gt; $age));
?&gt;
In the above code we provide the named parameters <code>:name</code> and <code>:age</code> to <code>prepare()</code>, which informs the database engine to pre-compile the query and attach the values to the named parameters later. When the call to <code>execute()</code> is made, the query is executed with the actual values of the named parameters. If you code this way, the attacker can’t inject malicious SQL as the query is already compiled and your database will be secure.

Protecting the File System

As a developer you should always write your code in such a way that none of your operations put your file system at risk. Consider the following PHP that downloads a file according to a user supplied parameter:

<?php
if (isset($_GET['filename']) {
    $filename = $_GET['filename'];
    header('Content-Type: application/x-octet-stream');
    header('Content-Transfer-Encoding: binary');
    header('Content-Disposition: attachment; filename="' . $filename . '";');
    echo file_get_contents($filename);
}
?>

The script is very dangerous since it can serve files from any directory that is accessible to it, such as the session directory and system directories. The solution is to ensure the script does not try to access files from arbitrary directories.

Protecting Session Data

By default, session information is written to a temp directory. In the case of a shared hosting server, someone other than you can write a script and read session data easily. Therefore, you should not keep sensitive information like passwords or credit card numbers in a session.

A good way to guard your session data is to encrypt the information stored in the session. This does not solve the problem completely since the encrypted data is not completely safe, but at least the information is not readable. You should also consider keeping your session data stored somewhere else, such as a database. PHP provides a method called session_set_save_handler() which can be used to persist data in session in your own way.

As of PHP 5.4 you can pass an object of type SessionHandlerInterface to session_set_save_handler(). Check out the PHP documentation to learn about implementing custom session persistence by implementing SessionHandlerInterface.

Proper Error Handling

It’s good to know about all the errors that occur while we’re developing an application, but when we make the application accessible to end users we should take care to hide the errors. If errors are shown to users, it may make our application vulnerable. So, the best approach is configuring your server differently for development and production environments.

In production mode we need to turn off display_errors and display_start_up_errors settings. error_reporting and log_errors should be on so that we can log errors while hiding those from end users.

You can use set_error_handler to define custom error handlers. However, it has limitations. The custom error handler bypasses the standard error handling mechanism of PHP. It cannot catch errors like E_CORE_ERROR, E_STRICT or E_COMPILER_ERROR in the same file the error handler is defined in. Furthermore, it will fail to handle errors that might occur within the handler itself.

To handle errors elegantly you should perform exception handling through try/catch blocks. Exceptions are represented by the Exception class and its subclasses. If any error occurs inside the try block you can throw an exception and process it in the catch block.

Guarding Included Files

PHP scripts often include other PHP files that contain code for things like connecting to a database, etc. Some developers give the included files an extension like .inc. Files with this extension are not parsed by PHP by default if called directly and will be served as plain text to the users. If an attacker directly accesses the include file that contains database credentials, he now has access to all of your application’s data. Always use the .php extension for included code files and keep them outside of directories directly accessible to users.

Get Recent Posts of A Category

In our WordPress Projects, sometimes we need to get the recent posts of any category. WordPress facilitates you to run custom query using query_posts.

Suppose in our project, ‘News’ is a category. Now we retrieve the posts of this category using query_posts().

<?php
query_posts('category_name=news&showposts=5&order=DESC');
echo '<ul>'
while (have_posts()) : the_post();
    echo '<li>'<a href="'.get_permalink().'" title="'.get_the_title().'" >'.get_the_title().'</a>'</li>'
endwhile;
echo '</ul>'
?>

You can also get the featured images and post detail.
<?php
//for featured image
get_the_post_thumbnail(get_the_ID(),'medium');

// for post detail
get_the_content()
?>

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Protect Your WordPress Site From Script Injections

Protecting dynamic websites is especially important. Code injection is the exploitation of a computer bug that is caused by processing invalid data. Code injection can be used by an attacker to introduce (or “inject”) code into a computer program to change the course of execution. The results of a code injection attack can be disastrous. For instance, code injection is used by some computer worms to propagate.

Most developers always protect their GET and POST requests, but sometimes this is not enough. We should also protect our blog against script injections and any attempt to modify the PHP GLOBALS and REQUEST variables.

Solution
The following code blocks script injections and any attempts to modify the PHP GLOBALS and _REQUEST variables. Paste it in your .htaccess file (located in the root of your WordPress installation). Make sure to always back up the .htaccess file before modifying it.

Options +FollowSymLinks
RewriteEngine On
RewriteCond %{QUERY_STRING} (\<|%3C).*script.*(\>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR]
RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2})
RewriteRule ^(.*)$ index.php [F,L]

Using this code, the first thing we’ve done is check the referrer to see that it matches our blog’s URL and it is not empty. 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Remove Your WordPress Version Number

You may know WordPress automatically displays the version you are using in the head of your blog files. This is pretty harmless if your blog is always up to date with the latest version (which is certainly what you should be doing anyway). But if for some reason your blog isn’t up to date, WordPress still displays it, and hackers will learn this vital piece of information.

The solution
Paste the following line of code in the functions.php file of your theme. Save it, refresh your blog, and voila: no more WordPress version number in the header.

remove_action('wp_head', 'wp_generator');

To execute certain actions, WordPress uses a mechanism called “hooks,” which allow you to hook one function to another. The wp_generator function, which displays the WordPress version, is hooked. 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How Regular Expression Works in PHP

^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$

It makes all the sense of ancient Egyptian hieroglyphics to you, although those little pictures at least look like they have meaning. But this… this looks like gibberish. What does it mean? It means oleomarg32@hotmail.com, Fiery.Rebel@veneuser.info, robustlamp+selfmag@gmail.ca,
or nearly any other simple email address because this is a pattern written in a language that describes how to match text in strings. When you’re looking to go beyond straight text matches, like finding “stud” in “Mustard” (which would fail btw), and you need a way to “explain” what you’re looking for because each instance may be different, you’ve come to need Regular Expressions, affectionately called regex.

Basic Principle of Regex Notation

To get your feet wet, let’s take the above example and break it down piece by piece.

^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$
The beginning of a line can be detected similar to carriage returns, even though it isn’t really an invisible character. Using ^ tells the regex engine that the match must start at the beginning of the line.

^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$
Instead of specifying each and every character of the alphabet, we have a shorthand that gives a range. Usually it is case sensitive so you’ll have to specify both an uppercase and lowercase range.

^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$
The same goes for numbers; we can simply shorten them to a range instead of writing all 10 digits.

^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$
These are the special characters we’re allowing: a dash, underscore, dot, plus-sign, and percent-sign.

^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$
The brackets surrounding our ranges effectively take everything you’ve put between them to create your own custom wildcard. Our “wildcard” is capable of matching any letter A-Z in either uppercase or lowercase, a digit 0-9, or one of our special punctuation characters.

^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$
This is a quantifier; it modifies how many times the previous character should match, in this case, the previous character is the set within brackets. + means “at least one,” so in our example, after matching the beginning of the string, we have to have at least one of the characters within the brackets.

At this point we can match (given the sample email addresses from earlier) oleomarg23, Fiery.Rebel, and robustlamp+selfmag. Something like @SodaCanDrive.com would fail because we must have at least one of the characters in the bracketed set at the very beginning of the text.

In addition to + as a quantifier, there is * which is almost identical except that it will match if there are no matches at all. If we replaced the first + quantifier in the sample with * and had this:

^<strong>[A-Za-z0-9-_.+%]*</strong>@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}

it would have successfully matched the string @SodaCanDrive.com as we are effectively telling the regex engine to keep matching until it comes across a character not in the set, even if there aren’t any.

Back to our original pattern…

^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$
The @ matches literally, so we now we’ve matched oleomarg23@, Fiery.Rebel@, and robustlamp+selfmag@. The text greencandelabra.com fails because it doesn’t have an at-sign!

^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$
This portion of the expression is similar to what we matched before the at-sign except this time we’re not allowing the underscore, plus-sign, or percent-sign. Now we’re up to oleomarg23@hotmail.com, Fiery.Rebel@veneuser.info and robustlamp+selfmag@gmail.ca. gnargly3.1415@pie_a_la_mode.com would only match up to gnarly3.1415@pie.

^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$
Here we have an escaped dot so as to match it literally. Note the plus-sign matched literally when it was inside brackets, but outside it had special meaning as a quantifier. Outside the brackets, the dot has to be escaped or it will be treated as the wildcard character; inside the brackets, a dot means a dot.

Uh oh! Since we already matched the .com, .info and .ca, it would seem like the match would fail because we don’t have any more dots. But regex is smart: the matching engine tries backtracking to find the match. So now we’re back to oleomarg23@hotmail., Fiery.Rebel@veneuser. and robustlamp+selfmag@gmail..

At this point, gnargly3.1415@pie_a_la_mode.com fails because the character after what’s matching so far is not a dot. drnddog@chewwed.legs.onchair continues as drnddog@chewwed.legs..

^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$
Remember how we made our own custom wildcard using brackets? We can do a similar thing with braces to make custom quantifiers. {2,4} means to match at least two times but no more than four times. If we only wanted to match exactly two times, we would write {2}. We could handle any quantity up to a maximum of four with {0,4}. {2,} would match a minimum of two.

{2,4} is our special quantifier that limits the last wildcard match to any 2, 3, or 4 letters or dots. We’ve nearly fully matched oleomarg23@hotmail.com, Fiery.Rebel@venuser.info and robustlamp+selfmag@gmail.ca. drnddog@chewwed.legs.onchair has to goes backwards further to drnddog@chewwed.legs to make the match.

We just have one more to go…

^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$
$ is the counter-part to ^. Just as ^ does for the start of the line, $ anchors the match to the end of the line. Our examples all match now, and drnddog@chewwed.legs.onchair fails because there isn’t 2, 3, or 4 letters preceded by a dot at the end of the string.

Regexs in PHP

It’s all well and good to have this basic understanding of the notation used by regular expressions, but we still need to know how to apply it in the context of PHP to actually do something productive, so let’s look at the function preg_match(), preg_replace() and preg_match_all().

preg_match()

To validate a form field for an email address, we’d use preg_match():

if (preg_match('/^[A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4}$/',
    $_POST["email"])) {
    echo "Email address accepted";
}
else {
    echo "Email address is all broke.";
}

If a match is found, preg_match() returns 1, otherwise 0. Notice that we added slashes to the beginning and end of the regex. These are used as delimiters to show the function where the regular expression begins and ends. You may ask, “But Jason, isn’t that what the quotes are for?” Let me assure you that there is more to it, as I will explain shortly.

preg_replace()

To find an email address and add formating, we would use preg_replace():

$formattedArticle = preg_replace(
    '/([A-Za-z0-9-_.+%]+@[A-Za-z0-9-.]+\.[A-Za-z]{2,4})/U',
    "<b>\\1</b>", $article);

Here’s that explanation that was promised: we’ve placed a U after the ending delimiter as a flag that modifies how the regex matches. We’ve seen how regex matches are greedy, gobbling up as many characters as it can and only backtracking if it has to. U makes the regex “un-greedy.” Without it, the string tweedle@dee.com-and-tweedle@dum.com would match as one. But by making it un-greedy, we tell it to find the shortest matching pattern… just tweedle@dee.com.

Did you notice we also wrapped the the whole expression in parentheses? This causes the regex engine to capture a copy of the text that matches the expression between the parenthesis which we can reference with a back-reference (\1). The second argument to preg_replace() is telling the function to replace the text with an opening bold tag, whatever matched the pattern between the first set of parenthesis, and a closing bold tag. If there were other sets of parenthesis, they could be referenced with \2, \3, etc. depending on their position.

preg_match_all()

To scan some text and extract an array of all the email addresses found in it, preg_match_all() is our best choice:

$matcheses= preg_match_all(
    '/([a-z0-9-_.+%]+@[a-z0-9-.]+\.[a-z]{2,4})/Ui',
    $user_mail, $listOfEmails);
if ($matcheses) {
    foreach ($listOfEmails[0] as $foundEmail) {
        echo $foundEmail . "<br>";
    }
}

preg_match_all() returns how many matches it found, and sticks those matches into the variable reference we supplied as the third argument. It actually creates a multi-dimensional array in which the matches we’re looking for are found at index 0.

In addition to the U modifier, we provided i which instructs the regex engine we want the pattern to be applied in a case-insensitive manner. That is, /a/i would match both a lower-case A and an upper-case A (or /A/i would work equally well for that matter since the modifier is asking the engine to be case-agnostic). This allows us to write things like [a-z0-9] in our expression now instead of [A-Za-z0-9] which makes it a little shorter and easier to grok.

Well that about wraps things up. 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