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How can you prevent your Web services from unauthorized access?

Posted By :Vanitha     Posted Date :December 06, 2013    Points :40   Category :ASP.Net 
The following are the ways to prevent your Web service from unauthorized access:


Using encryption and message-based security.
Using authentication and access controls for the Web service.

You can also find related Interview Question to How can you prevent your Web services from unauthorized access?  below: 

When retrieving List items using SharePoint Web Services, how do you specify explicit credentials to be passed to access the list items?

  
In order to specify explicit credentials with a Web Service, you generally instantiate the web service, and then using the credentials properties of the Web Service object you use the System.Net.NetworkCredential class to specify the username, password, and domain that you wish to pass when making the web service call and operations.
(More...)

What is Active Directory? What is the namespace used to access the Microsoft Active Directories? What are ADSI Directories?

  
Active Directory Service Interfaces (ADSI) is a programmatic interface for Microsoft Windows Active Directory. It enables your applications to interact with diverse directories on a network, using a single interface. Visual Studio .NET and the .NET Framework make it easy to add ADSI functionality with the DirectoryEntry and DirectorySearcher components.

Using ADSI, you can create applications that perform common administrative tasks, such as backing up databases, accessing printers, and administering user accounts. (More...)

What is the relationship between the .NET Framework and COM+ Services?

  
The .NET Framework gives you full access to COM+ services, while also making it easier to build serviced components.
.NET Framework components can be added to a COM+ application. There they can take advantage of automatic component services such as transactions, object pooling, queued components, events, and so on. (More...)

What is the relationship between the .NET Framework and COM+ Services?

  
The .NET Framework gives you full access to COM+ services, while also making it easier to build serviced components.
.NET Framework components can be added to a COM+ application. There they can take advantage of automatic component services such as transactions, object pooling, queued components, events, and so on. (More...)

NET Remoting Versus Web Services?

  
With the advent of .NET and the .NET Framework, Microsoft introduced a set of new technologies in the form of Web services and .NET remoting. .NET remoting and ASP.NET Web services are powerful technologies that provide a suitable framework for developing distributed applications. It is important to understand how both technologies work and then choose the one that is right for your application.

The Web services technology enables cross-platform integration by using HTTP, XML and SOAP for communication thereby enabling true business-to-business application integrations across firewalls. Because Web services rely on industry standards to expose application functionality on the Internet, they are independent of programming language, platform and device.

Remoting is .a technology that allows programs and software components to interact across application domains, processes, and machine boundaries. This enables your applications to take advantage of remote resources in a networked environment.

Both Web services and remoting support developing distributed applications and application integration, but you need to consider how they differ before choosing one implementation over the other. In this article, I will show the differences between these two technologies. I will present samples for each type of implementation and identify when to use which technology. (More...)

What is CODE Access security?

  
CAS is part of .NET security model that determines whether or not a piece of code is allowed to run and what resources it can use while running. Example CAS will allow an application to read but not to write and delete a file or a resource from a folder. (More...)

If any .NET language has access to everything in the Base Class Library, why is there so much talk about C#?

  
Although in theory all .NET languages have equal access to the BCL, in reality it was left up to the language teams to determine what level of support they wanted to offer, at least beyond the minimums needed for basic compliance. In our opinion, C#, because it was developed as a new language specifically for the .NET platform, has the best support for .NET applications. (More...)

What are notification services?

  
Notification Services is a programming framework based on XML and T-SQL. It is used to create applications that generate and send messages to subscribers.

Notifications can be sent according to a schedule, or in response to conditions or events. Notifications can be sent to a wide variety of devices. For example, a notification can be sent to a user's cellular phone, personal digital assistant (PDA), Microsoft Windows Messenger, or e-mail account. Because these devices often accompany the user, notifications are ideal for sending high-priority information.

We can create the notification Services in 2 ways:
The first would be to build everything from scratch, second is to use the SQL Server 2005 Notification Services (SQLNS), which is a new API, intended to help you build notification applications. SQLNS applications are always hosted inside the SQL Server or inside a Windows Service. (More...)

What are basic components of Notification services?

  
Notification Services applications are based on a subscriber/subscription model.
The Key components in a Notification Services application are

Subscriber
A user or application that requests and receives the notification

Subscription
A request for information, delivery mechanism, and destination for requested notifications. For example change of a stock price.

Event
A piece of information, in which the subscriber is interested. For example as soon as a stock price has changed an event can be generated that's processed within SQLNS.

Notification
A message containing the information requested by the subscriber in the subscription (More...)

Explain architecture of Notification Services?

  
Notification Services applications are based on a subscriber/subscription model.
The Key components in a Notification Services application are

Subscriber: A user or application that requests and receives the notification
Subscription: A request for information, delivery mechanism, and destination for requested notifications. For example change of a stock price.
Event: A piece of information, in which the subscriber is interested. For example as soon as a stock price has changed an event can be generated that's processed within SQLNS.
Notification: A message containing the information requested by the subscriber in the subscription.

SQLNS executes the following steps whenever it generates a new notification and sends it to registered subscribers:

.Subscribers create subscriptions with a subscription management application, such as an ASP.NET or Windows Forms front end.
.Subscription management is the only part of an SQLNS application where users or applications are actively involved in the process. You generate subscriptions using a managed assembly shipped with SQLNS.
.The Notification Application collects events, which are processed within the SQLNS application.
.SQLNS uses T-SQL statements to assign events to the subscriptions registered in the first step.
.SQLNS generates new notifications whenever it finds an assignment.
.A Formatter formats the new notification, and SQLNS delivers it through a delivery channel to the registered target device of the subscriber. (More...)

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