WCF Service question.

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In an interview an interviewer asked me :
"Suppose I have a wcf service.There are 3 methods say A1,A2,A3.
Now I have 2 clients . One will use only A1 and second one will use A2 and A3.
So How can I protect my A2 and A3 methods from First Client?"
Please help me?

Posted 30-Jan-16 4:54am

Avik Ghosh22

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John C Rayan 30-Jan-16 14:55pm

This is a tricky question. Usually you cannot protect any clients from accessing the published methods. However you can prevent them executing the methods.

Sergey Alexandrovich Kryukov 30-Jan-16 22:36pm

Rather, it's not a definitive question, strictly speaking, totally incorrect. There is no such concept as "first client" or "second client". It should be explained how should be distinguished as different. It should be an essential part of the question. Damn, those interviewers...
—SA

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Beginner Luck · Answer 1 · 2016-01-30T15:37:00

Solution 1

use IP address to block

Request.UserHostAddress // use ip address
Request.UserHostName // use mac address

firstaddress 122.1.1.1
2ndaddress 111.1.1.13
check for ipaddress if is firstaddress then block from using A2 and A3
check for ipaddress if is 2ndaddress then block from using A1

Posted 30-Jan-16 15:37pm

Beginner Luck

Comments

John C Rayan 31-Jan-16 2:39am

where will you check the IP addresses? Inside the methods right, if so the clients already accessed the methods. You can only stop them executing the business logic inside the methods but cannot stop them accessing it published methods.

It is better using certificates rather than using IP addresses for identifying clients.

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