#input validation

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In the past few years with the rise of technological innovations, there has been an increase in the number and sophistication of security breaches. Poor input validation has turned out to be the root cause of these embarrassing data breaches reported in the last few years. While compiling the code, the developers create input fields for the users to enter whatever they wish. The website is secure until the unchecked input fields are not used for hacking.

What Is Input Validation?

Websites processing input data from users or a wide range of systems should ensure that it is valid. Validation is carried on a variety of levels ranging from simply verifying the input types and lengths i.e. syntactic validation to ensuring the inserted values are valid in the application context i.e. semantic validation.

For websites, input validation is nothing but verifying the values inserted in the input field ensuring date, email address and other details inserted in the field are valid. This is the initial step for client-side validation performed directly in the browser and submitted values are verified on the server-side.

In programming input validation is very important.  When user input is not validated malicious users can exploit security issues in computer applications.

For example, most recently PHP has had a buffer overflow in the file info functionality when checking elf files.  Additionally XML has had some serious security holes in 2014.  The first was heartblead and the second was a version of the billion laughs exploit.  An integer overflow was recently discovered in RPM which allowed arbitrary code execution.

Historically there have also been null byte security issues with user input files and file handling during program execution.

Ways to validate user input

1.) Regular Expressions

Regular expressions are a available to each programmer through api's in the language.  What if all of your data was in the Latin char set by database restriction and a user input UTF-8 data.  This could result in a database overflow.  A regular expression could be used to remove and place an error message to the user which would mitigate the overflow.

2.) PHP Filter Functionality

PHP has the filter api.  This has two types of filters the validate and sanitize filters.  Calling these functions removes the null byte and validate or sanitize the input.  Built in functionality can process request variables in a web application.

3.) Data Type Casting

Data can be cast to the correct type, but can result in data loss due to truncation.  This should be used as a last resort, due to data loss.

Size Checking

In addition to type checking the programmer should also check the size of the data.  If this is not done applications can have issues related to program overflow errors. 

All data should be checked that it is in range with the bounds of the application, which in some cases could be restricted by the database.  Here is an example of an integer overflow in CVE-2014-7185.

Conclusion

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Valideasy – jQuery Plugin for Form Validation

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jQuery Valideasy

Never write complex JS script again to handle your form validation rules! With Valideasy, everything’s done via HTML attributes added to your form fields.

Setup

Load latest jQuery library

Load js/jquery-valideasy.min.js

Instantiate Valideasy on your form :

$('form').submit(function() var formIsValid = $(this).valideasy( options ); return formIsValid; );

Options

For most forms, you won’t need extra configuration for Valideasy to work properly. In some cases though, you might need to change the default parameters to meet your specific needs. There are two ways to set parameters:

As data- attribute in the <form> element.

As argments when instantiating Valideasy in your JS file.

Let’s take an example with the mode parameter (described below), you can set it either in your form element:

<form data-valideasy-mode="unified">

Or when instantiating the plugin:

$(this).valideasy( mode: 'unified' );

Here is the full (but short) list of available parameters, along with their default values. To use them as data- attributes, simply prefix with data-valideasy-

Note Parameters expecting functions cannot be used as data- attributes.

defaults = mode: 'single', errorElementId: 'errors', disableFieldStyle: false, stepByStep: false, scrollToFirstError: false, singleFieldValidation: false, onValidateBefore: function() return; , onValidateAfter: function() return; ,

mode

How error messages are displayed.

single: each message is located near its field

unified: all messages at the same place, one at a time

errorElementId

Indicates the ID of the field(s) supposed to display error messages.

in single mode, the error message will be inserted in the element with ID field_iderrorElementId. For example: nameerrors

in unified mode, all the error messages will be inserted in the same element, with specified ID errorElementId.

disableFieldStyle

Set to true to stop adding the .error class to fields with errors

stepByStep

Set to true to stop validation at first error

scrollToFirstError

Set to true to auto scroll to the first error field at the end of the validation process

singleFieldValidation

Set to true to only perform validation on one field, instead of on the entire form. For this to work, Valideasy must be instantiated on a field element.

Hooks

As of version 2.2.1, you can hook to pre and post validation events to perform certain tasks. Available hooks are :

onValidateBefore Triggered right before the validation process begins. This hook receives two parameters: the form element being validated, and the array of the plugin options.

onValidateAfter Triggered right after the validation process ends. This hook receives three parameters: the form element being validated, the array of the plugin options, and the validation status.

Markup

Validation rules are specified in the class attribute of the field

Default value of the field must be specified both in the value attribute and in the title attribute

In single mode, every field must be accompagnied with an element with the ID fieldId_errorElementId and class .error-wrapper. Any error message triggered by this field will be inserted in that element.

In unified mode, an element with the ID errorElementId and class .error-wrapper should be placed somewhere in the page. The first error message triggered by a field in the form will be placed in that element.