User input remains the primary cause of vulnerabilities in most of the web applications. The process of screening the user entered input for malicious content is known as input validation. Input validation is a proactive step taken to avoid falling prey to commonly known vulnerabilities. Although the need for performing good input validation is fairly obvious to everyone in the field, not many people do a good job at the same.
The Validator.NET application was designed to enable developers to programmatically determine user input locations that could be potentially exploited by hackers and provides proactive steps to build data validation routines which are loaded into a protection module. The tool helps eliminate common vulnerabilities such as SQL Injection and Cross-Site Scripting.
The need for input validation originates from the premonition that all input is evil. Hackers and security professionals have managed to compromise the web applications time and again because the developers followed no strategy to defend their web applications. In a race to check for malicious content the developers always were left behind because the hackers managed to encode their malicious content in innocuous looking input.
Writing code to check for every input field was often taxing, inefficient, incomplete and not through. For the same reasons Microsoft provided extensive validation framework in ASP.NET. The aim was to help developers perform data validation routines faster and in a more efficient manner. Even with the presence of these validators, data validations techniques are no where near acceptable level.
Lack of security awareness among developers is part of the reason for insufficient data validation techniques in most of the existing applications. The result is that we have many production environments which do not have acceptable data validation mechanisms. The cost of making code fixes in these applications is often very high and hence is not the most effective solution.
Buffer overflows, SQL inject, Cross-Site Scripting and Denial of service are just a few of the most common vulnerabilities caused by bad input validation techniques.
If proper data validations techniques are not implemented then there always exists the possibility of falling prey to one or more of the above mentioned vulnerabilities.
The need was to develop a cost effective input validation solution for the large number .NET of web application that do not have acceptable validation routines. The solution was required to have minimal code changes and should be completely configurable to tailor the needs of every web application. Considering the problems at hand, Foundstone devised the Validator.NET tool.
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The tool is designed to validate all the data across the entire application irrespective of the form or ASP.NET server controls in use. The core module of Validator.NET Crack Free Download is the library that holds the validation rules. Developers can easily customize, extend or modify the existing library to meet their needs.
The library provided by Validator.NET is extensible. The basic version includes 40 core validation rules which cover most of the common application vulnerabilities. To enable additional validation features further validators can be added to a particular group. For example, a hacker might be able to bypass security at a login prompt by passing gibberish in the username field.
To prevent this from happening, the validator can be customized by adding a new validator to the first group and assigning a name or tag to the validator.
The list of validators can be provided either by developers or by the administrators on-demand. The validators can be customized on a per-group basis. For example, say you have a bank application and want to prevent users from typing in their account number with leading or trailing spaces. You can easily add a leading space validator to the first group. This will prevent leading spaces from being entered into any field by the users.
Once the validators are added, they can be assigned a name, description and validation logic. It is important to assign a name to the validator so that it is easy to understand and trouble shoot the rules.
To simplify the task of validating data, Validator.NET provides the capability to write the validation logic to use the C# and Visual Basic 2005 object relational mapping. This allows developers to use the power of C# and Visual Basic in the validation code.
Validation logic can also be customized to suit the needs of a particular business application. For example, if a bank web application required the input for the account number to be a even digit, Validator.NET can be customized to perform the same.
While the key aim of Validator.NET is to automate the data validation for the large number of web applications, the tool can be used by developers of all experience levels.
The Validator.NET tool has been built on a Microsoft server technology called the.NET Data Access Layer (DAL). The.NET DAL is a part of the Microsoft Data Access Components (MDAC). The.NET DAL provides an interface for data access applications. The.NET DAL supports binary, text, xml, varchar and datetime formats
Validator.NET
Validator.NET is an input validation tool which makes use of the.NET Framework for providing various data validation routines. The Validator.NET tool uses the Predefined Validation Rules built into.NET Framework to provide the data validation routines.
The.NET Framework Predefined Validation Rules are categorized into data type and string control. The data validation rules are executed when data is changed. In Validator.NET such changes are detected using the event triggered data change technique. The event is sent by the.NET Framework when data is changed, for example, a control’s text is set. This change triggers the data validation rules to be executed. The implementation relies on the.NET Framework feature of the event triggered data change.
In the mode of operation, the client requests the results of the validation on the server. Once the server receives the request it sends a response to the client. It is important to note here that the client does not receive any response from the server. In fact, the server does not ever make any network requests.
To prevent malicious users from falsifying their output, the data returned by the server is checked against the input data before sending it to the client. Validator.NET controls the user access to the tool and does not allow a malicious user to send fake data to the server.
Steps for building a Validator.NET Type Control:
The below described procedure illustrates how to create a Validator.NET control to display data validation text and perform the various data validations routines.
The first thing you need to consider is the following, how big would the control be? If the control will be used at various places in the application, it should be reused by various user controls. So, it is desirable to have a reusable control or at least a reusable data validation class. You could inherit from the Validator.NET Data Validation control and create a custom control. You can then have the custom control set to the Validator.NET Data Validation control or set the base control property to a custom base control.
We will demonstrate by creating a custom control the data validation control class called Validator.
First, we need to define the data validation control class. We do not need to override the base control class. We just need to add the property to this class, so it can be reused in other user controls. The CustomControlBase class should be inherited from Validator.NET Data Validation Control to give the custom control a similar look and feel.
In the
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Validator.NET is an open source (licensed under a GPL v3.0 license), Web based,.NET framework based, data validation application for the large number of web applications that do not have acceptable validation routines.
The.NET framework was chosen for this project as it is the most powerful and supported framework for.NET applications and by the same token is the most powerful and supported framework for server-side programming as well.
It was also decided to convert the original open source code to a configuration driven application. This was done to enable the developers to easily change the application to suit their application requirements.
In addition to these, a plug-in driven GUI was also implemented to aid the end user in validating the input for their web applications.
The solution is an open source product and is licensed under a GPL v3.0 license.
The conversion of the original open source code was done in a rapid turn around. The framework using the original open source code was created in less than 3 months. The plug-in driven GUI was built in less than 2 months. The product was launched as open source product after less than 10 months of development and for less than a USD 10,000.
The Validator.NET application is a plug-in driven application. It therefore does not require any installation and all the configurations are done through the GUI.
The application loads every required modules at run-time and loads these modules by passing parameters to the appropriate function. This is achieved by appending parameters in the query string of the web application, by setting windows property or by passing in the application configuration file.
There are various modules available within the application. Each of these modules are distinct from each other and can be used in any configuration to suit their respective web application. This is the best thing about the product.
Modules include:
.NET Framework protected assembly checks. This module checks for vulnerability in MS.NET Framework code embedded in an assembly.
Cross-Site Scripting (XSS) Filters. This module prevents malicious HTML that is served as script or HTML code to be passed on to the user as a parameter in the request.
Form Validation. This module enables the developers to validate user input locations such as URL parameters, form fields, query string parameters, cookies and other request headers.
SQL Injection Filters. This module is capable of decoding SQL queries and blocks those queries that are found to be potentially exploitable.
Hidden Field filters. This module restricts the use
What’s New In Validator.NET?
Used to perform input validation rules on pages that are not compiled with the version of the.NET Framework which provides support for the security features. The tool consists of several components.
Core:
Core consists of the input validation rules. The rules are stored in XML files. The rules are loaded into.NET validation modules. These input validation modules can also be used to generate front end validation controls for.NET code. The validation module is compiled with.NET framework support classes. If the.NET version is not there, a message is displayed with a link to download the.NET Framework.
Examples:
.NET Framework version 1.0:
.NET Framework version 2.0:
Input validation module is loaded into the web application and components are generated for validation. Depending on the framework version the base classes for validation are a.NET input validation module or ASP.NET input validation module.
The tool implements the following features to validate user input:
ASP.NET:
IPreValidateInput interface
IPostValidateInput interface
.NET:
Microsoft.NET Framework (any version, including.NET 1.0)
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Examples:
ASP.NET with.NET Grep:
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System Requirements For Validator.NET:
Windows 8/Windows 7/Vista
Memory: 1 GB
CPU: Intel i5 or AMD equivalent
Hard Disk: 10 GB
Recommended System Specifications:
Memory: 2 GB
*Minimum requirements may vary depending on your choices.
Windows 10
Windows 10 is available only for x64 version at this time.
Memory: 4 GB
CPU: Intel i5 or AMD
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