Thursday, April 2, 2015

Htaccess code syntax to prevent your wordpress website from attackers

Htaccess code syntax to prevent your wordpress website from attackers 
Hypertext access (.htaccess) file is the common name of a directory-level configuration file which allows decentralised management of web server configuration. A .htaccess file is always added to the root directory, it can override many other configuration settings which includes server’s global configuration, content type and character set.



 A .htaccess file can be used for lots of hacks that will secure and improve functionality for WordPress blogs and websites. Following are lists of main htaccess code snippets which will improve and prevent WordPress sites from hackers. Some will allow to block specific IP addresses to visit the site, redirect visitors to maintenance page when particular site is redesigned or modified, prevent IP addresses to login into the wordpress admin section etc.


Blacklist undesired users and bots ip address
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/


order allow,deny
allow from all
deny from 132.151.389
deny from 91.131.784
deny from 773.966.769
deny from 178.406.880



?>


Redirect visitors to a maintenance page
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

RewriteEngine on
RewriteCond %{REQUEST_URI} !/maintenance.php$
RewriteCond %{REMOTE_ADDR} !^123.123.123.123
RewriteRule $ /maintenance.php [R=302,L]


?>


Redirect www to non www or vice versa
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www.yourblogpath.com [NC]
RewriteRule ^(.*)$ http://yourblogpath.com/$1 [L,R=301]
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^yourblogpath.com [NC]
RewriteRule ^(.*)$ http://www.yourblogpath.com/$1 [L,R=301]


?>


Force Caching with htaccess
The following htaccess code won’t help the initial pageload, but it will significantly help subsequent pageloads by sending 304 statuses when requested elements haven’t been modified.
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

FileETag MTime Size
ExpiresActive on
ExpiresDefault "access plus x seconds"


?>


Allow only your IP adress on the wp-admin directory
Replace your IP with allow from xx.xx.xx.xx which will only allow your IP to access wp-admin directory.
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

AuthUserFile /dev/null
AuthGroupFile /dev/null
AuthName "Wordpress Admin Access Control"
AuthType Basic

order deny,allow
deny from all
allow from xx.xx.xx.xx



?>


The easiest way to ban a WordPress spammer
To block certain IP address from accessing your blog enter the following code into .htaccess file and replace example IP address with the one you want to ban.
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/


## USER IP BANNING

order allow,deny
deny from 670.45.145.125
allow from all


?>


Deny access to your wp-config.php file
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

# protect wpconfig.php

order allow,deny
deny from all



?>



Limit the File upload size to 10MB
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

# limit file uploads to 10mb
LimitRequestBody 10240000


?>


Password protected directories
A simple way to password protect blog directories
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

AuthType Basic
AuthName "restricted area"
AuthUserFile /usr/local/var/www/html/.htpasses
require valid-user


?>


Quickly secure plugin files
WordPress plugin files might have a loop hole and may allow hackers to get into your website. To prevent others to have direct access to plugin files use following code.
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/


  order allow,deny
  allow from all



?>

Saturday, March 21, 2015

Popular Security Libraries for PHP Developers

Today, PHP is one of the most popular web programming language for creating dynamic websites. There is bunches of data on the web that PHP developers make utilization of. On the other hand, few of them are obsolete and can manage anybody to compose "awful code.

In this post, we have introduced to popular PHP security libraries that will help them to create security interfaces for web applications. If you have any suggestion regarding PHP Security Libraries please write in comment box. Thanks

Popular Security Libraries for PHP Developers


HTML Purifier

HTML Purifier is a standards-compliant HTML filter library written in PHP. HTML Purifier will not only remove all malicious code (better known as XSS) with a thoroughly audited, secure yet permissive whitelist, it will also make sure your documents are standards compliant, something only achievable with a comprehensive knowledge of W3C’s specifications.

URLcrypt

URLcrypt makes it easy to securely transmit short pieces of binary data in a URL. Use it to securely store things like user IDs, download expiration dates, and more. URLcrypt uses 256-bit AES symmetric encryption to securely encrypt data, and encodes and decodes Base 32 strings that can be used directly in URLs.

PHP Intrusion Detection System

PHPIDS (PHP-Intrusion Detection System) is a simple to use, well structured, fast and state-of-the-art security layer for your PHP based web application. The IDS neither strips, sanitizes nor filters any malicious input, it simply recognizes when an attacker tries to break your site and reacts in exactly the way you want it to. Based on a set of approved and heavily tested filter rules any attack is given a numerical impact rating which makes it easy to decide what kind of action should follow the hacking attempt. This could range from simple logging to sending out an emergency mail to the development team, displaying a warning message for the attacker or even ending the user’s session.

TCrypto

TCrypto is a simple and flexible PHP 5.3+ in-memory key-value storage library. By default, a cookie will be used as a storage backend. TCrypto has been designed from the ground up with security in mind. Safe algorithms and modes. Automatic and safe initialization vector creation. Encryption and authentication key creation (Keytool) using strong randomness. Key rotation (versioned keys). TCrypto can be used as a scalable “session handler”. Especially scalable, if cookies are used as a storage backend. This is a bit like Ruby on Rails sessions.

PHP Password Lib

PHP-PasswordLib aims to be an all-inclusive cryptographic library for all cryptographic needs. It is meant to be easy to install and use, yet extensible and powerful enough for even the most experienced developer.

PHPSecLib

phpseclib is designed to be ultra-compatible. It works on PHP4+ (PHP4, assuming the use ofPHP_Compat) and doesn’t require any extensions. For purposes of speed, mcrypt is used if it’s available as is gmp or bcmath (in that order), but they are not required.

Hybrid Auth

HybridAuth is an open source PHP library for authenticating through multiple social services and ID providers. The services supported include OpenID,Facebook, LinkedIn, Google,Twitter, Windows Live, Foursquare, Vimeo, Yahoo, PayPal and more. It can be integrated easily into existing websites by inserting a file and few lines to the sign-in/up pages.

Security Check – Sensiolabs

This tool is almost essential to both beginners and experienced PHP coders. The way it works is quite simple, you upload your .lockfile and it does the rest for you. If you look at the stats, the numbers of vulnerabilities found is quite staggering, don’t be surprised if your own projects might output some nasty stuff that you have missed.

SecurityMultiTool

A multitool library offering access to recommended security related libraries, standardised implementations of security defences, and secure implementations of commonly performed tasks. The purpose of the library is to serve as both a useful set of utilities and to act as a set of reference implementations which can be learned from. It may be used by applications regardless of whether they are web application framework based or not. The use of a web application framework does not guarantee your security.

What is contrast in the middle of MYISAM and InnoDB?


What is contrast in the middle of MYISAM and InnoDB?

In this post, I am explaining to each one of PHP developer to understand the difference between MYISAM and INNODB

MYISAM
1. MYISAM supports Table-level Locking
2. MyISAM designed for need of speed
3. MyISAM does not support foreign keys hence we call MySQL with MYISAM is DBMS
4. MyISAM stores its tables, data and indexes in diskspace using separate three different files. (tablename.FRM, tablename.MYD, tablename.MYI)
5. MYISAM not supports transaction. You cannot commit and rollback with MYISAM. Once you issue a command it’s done.

INNODB
1. InnoDB supports Row-level Locking
2. InnoDB designed for maximum performance when processing high volume of data
3. InnoDB support foreign keys hence we call MySQL with InnoDB is RDBMS
4. InnoDB stores its tables and indexes in a tablespace
5. InnoDB supports transaction. You can commit and rollback with InnoDB

Friday, December 19, 2014

Parse Website with PHP

Parse Website with PHP

Parsing website pages is always a challenge for PHP Developers. Parsing is using for retrieving images, scraping websites, crawling, error detection websites, and many other useful purposes. But PHP Simple HTML DOM Parser is a awesome or can say dream library for developer that work with both PHP and the DOM element using PHP.


You can get the Simple HTML DOM Parser from here and save file to any directory of your choice. First in a basic example we’ll include the class, and get all hyperlinks on the http://4evertutorials.blogspot.com .

<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

// Include the parser library
include('simple_html_dom.php');

// Retrieve the DOM from a given URL
$html_dom = file_get_html('http://4evertutorials.blogspot.com/');

// scan for all hyperlinks and print
foreach ($html_dom->find('a') as $element) {
       print $element->href;
}

?>
Below are few basic uses of PHP Simple HTML DOM Parser.
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

// Include the parser library
include('simple_html_dom.php');

// Retrieve the DOM from a given URL
$html = file_get_html('http://4evertutorials.blogspot.com/');

// Find all anchor tags and print their HREFs
foreach($html->find('a') as $e) 
    echo $e->href;

// Retrieve all images and print their SRCs
foreach($html->find('img') as $e)
    echo $e->src;

// Find all images, print their text with the "<>" included
foreach($html->find('img') as $e)
    echo $e->outertext;

// Find all SPAN tags that have a class of "SpanClass"
foreach($html->find('span.SpanClass') as $e)
    echo $e->outertext;

// Find all TD tags with "align=center"
foreach($html->find('td[align=center]') as $e)
    echo $e->innertext;

// Extract all text from a given cell
echo $html->find('td[align="center"]', 1)->plaintext;

// Find the DIV tag with an id of "DivId"
foreach($html->find('div#DivId') as $e)
    echo $e->innertext;


?>

Thursday, October 16, 2014

Install CodeIgniter Framework


In this post we will cover how to install codeigniter framework and we will view the most common steps to install codeigniter framework. CodeIgniter is one of the most popular PHP frameworks around. It uses the Model-View-Controller Architectural design pattern and it’s considered by lots of PHP developers as one of the best framework solution for small to medium projects.

How to Install

The installation itself is such a simple process. First of all, you need to download the CodeIgniter zipped file, upload it to your server and extract it into your home directory. You can download it from https://ellislab.com/codeigniter/user-guide/installation/downloads.html.

Configuring CodeIgniter

Congratulations, now you have CodeIgniter installed on your server. Now it’s time for configuration. Open the application/config/config.php file with your preferred editor and set your base URL. If you intend to use encryption or sessions, set your encryption key. For the database configuration, open the application/config/database.php file with your preferred editor and set your database host, name, user, password and other values that you think it will help you connect to your database. You will find array variables with comments to know the role of each value.

Configuration files

By editing the two previously mentioned files, you are ready to start coding your first web application but CodeIgniter contains more files that enable more configuration and customization abilities. The configuration files can be found in the application/config/ directory. The following is a quick description of what you can do by editing some of the most commonly used configuration files:

autoload.php : specifies which systems (Packages, Libraries, Helper files, Custom config files, Language files and Models) should be loaded by default.

config.php : contains all website configuration.

constants.php : contains defined constants which are used when checking and setting modes when working with the file system.

database.php : contains the settings needed to access your database.

email.php : This file is not created by default. But you can create it and set the default values for the email class. Like: mailtype, charset, newline, protocol, smtp_host, etc.

hooks.php : lets you define “hooks” to extend CI without editing the core files.

mime.php : contains an array of mime types. It is used by the upload class to help identify allowed file type.

routes.php : lets you re-map URI requests to specific controller functions.

smileys.php
: contains an array of smileys for use with the emoticon helper.

upload.php : This file is not created by default. But you can create it and set the default values for the upload class. Like: upload_path, allowed_types, max_size, max_width, max_height, etc.

user_agents.php : contains four arrays of user agent data. It is used by the User Agent Class to help identify browser, platform, robot, and mobile device data. The array keys are used to identify the device and the array values are used to set the actual name of the item.

Monday, October 6, 2014

php To PDF

php To PDF is an API based solution. We are a web service providing you the easiest way to generate PDF files from PHP Code.

Our server does the heavy lifting and generates the PDFs for you. The generated PDF files will be returned and stored on your server in the specified directory with your specified file name, or you can set them to be created and displayed or downloaded by a user on the fly.

You do not need any special packages or permissions. It works on any server running PHP!

We have simplified our API so that you just need to download the phpToPDF.php file from your account and include it in your code. It's that simple.

Get started :: PHP to PDF generation steps
1  Sign up to access our API   
2  FREE!
3  Download and include phpToPDF.php

Sample Code

Use the phptopdf() function for creating a PDF using a URL



<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/


    require('phpToPDF.php');

    //Set Your Options -- see documentation for all options
    $pdf_options = array(
          "source_type" => 'url',
          "source" => 'http://google.com',
          "action" => 'save');

    //Code to generate PDF file from options above
    phptopdf($pdf_options);
 

?>



Alternatively, you can use the phptopdf() function to pass a varible that holds html code for your PDF.

<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

    require('phpToPDF.php');

    //Your HTML in a variable
    $my_html="

PDF from HTML using phpToPDF

"; //Set Your Options -- we are saving the PDF as 'my_filename.pdf' to a 'my_pdfs' folder $pdf_options = array( "source_type" => 'html', "source" => $my_html, "action" => 'save', "save_directory" => 'my_pdfs', "file_name" => 'my_filename.pdf'); //Code to generate PDF file from options above phptopdf($pdf_options); ?>


[ More Examples ]

Thursday, September 4, 2014

New features in PHP 5.6

The PHP development team announced new release of PHP 5.6. The new release brings new features and lots of improvements, development team say, also as some backward incompatible changes.

Following are the most important changes in PHP 5.6 release:




Constant scalar expressions
It is now possible to provide a scalar expression involving numeric and string literals and/or constants in contexts where PHP previously expected a static value, such as constant and property declarations and default function arguments.
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

const ONE = 1;
const TWO = ONE * 2;

class C {
    const THREE = TWO + 1;
    const ONE_THIRD = ONE / self::THREE;
    const SENTENCE = 'The value of THREE is '.self::THREE;

    public function f($a = ONE + self::THREE) {
        return $a;
    }
}

echo (new C)->f()."\n";
echo C::SENTENCE;

//The above example will output:
/*
4
The value of THREE is 3
*/

?>
Improved syntax for variadic functions
Variadic functions can be declared through a new ... operator:

<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/
 
function f($req, $opt = null, ...$params) {
    // $params is an array containing the remaining arguments.
    printf('$req: %d; $opt: %d; number of params: %d'."\n",
           $req, $opt, count($params));
}

f(1);
f(1, 2);
f(1, 2, 3);
f(1, 2, 3, 4);
f(1, 2, 3, 4, 5);

// The above example will output:
/*
$req: 1; $opt: 0; number of params: 0
$req: 1; $opt: 2; number of params: 0
$req: 1; $opt: 2; number of params: 1
$req: 1; $opt: 2; number of params: 2
$req: 1; $opt: 2; number of params: 3
*/

?>
Argument unpacking via ... operator
Arrays and Traversable objects can be unpacked into argument lists when calling functions by using the ... operator. This is also known as the splat operator in other languages, including Ruby.

<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

function add($a, $b, $c) {
    return $a + $b + $c;
}

$operators = [2, 3];
echo add(1, ...$operators);

// The above example will output:
/*
6
*/
?>

Exponentiation via ** operator
A right associative ** operator has been added to support exponentiation, along with a **= shorthand assignment operator.

<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/

printf("2 ** 3 ==      %d\n", 2 ** 3);
printf("2 ** 3 ** 2 == %d\n", 2 ** 3 ** 2);

$a = 2;
$a **= 3;
printf("a ==           %d\n", $a);

// The above example will output:
/*
2 ** 3 ==      8
2 ** 3 ** 2 == 512
a ==           8
*/

?>


use function and use const
The use operator has been extended to support importing functions and constants in addition to classes. This is achieved via the use function and use const constructs, respectively.


<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/ 
 
namespace Name\Space {
    const FOO = 42;
    function f() { echo __FUNCTION__."\n"; }
}

namespace {
    use const Name\Space\FOO;
    use function Name\Space\f;

    echo FOO."\n";
    f();
}

// The above example will output:
/*
42
Name\Space\f
*/


?>

Now UTF-8 is Default character encoding
default_charset is now used as the default character set for the htmlentities(), html_entity_decode() and htmlspecialchars() functions. Note that if the (now deprecated) iconv and mbstring encoding settings are set, they will take precedence over default_charset for iconv and mbstring functions, respectively.

Large file uploads 
Files larger than 2 gigabytes in size are now accepted.

GMP supports operator overloading
GMP objects now support operator overloading and casting to scalar types. This allows for more expressive code using GMP:
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/ 
 
$a = gmp_init(42);
$b = gmp_init(17);

// Pre-5.6 code:
var_dump(gmp_add($a, $b));
var_dump(gmp_add($a, 17));
var_dump(gmp_add(42, $b));

// New code:
var_dump($a + $b);
var_dump($a + 17);
var_dump(42 + $b);

?>

Full list of all changes in PHP 5.6 can be additionally found in the here.

 

© 2014 4everTutorials. All rights resevered.

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