How to prevent any user to upload any file from local system to internet

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Hi!
To maintain the Information security, i just wants to prevent my domain users to upload any file to internet.
Or I want to show an alert message to them when they clicked any button that open choose file dialog.

Understand? If not, then No Problem...
For example

I have clicked a button on webpage opened in any browser (Let's assume Google Chrome), Then OpenFileDialog will be shown. Now Before Showing "OpenFileDialog" i want to show a message "Why do you want to upload file?"(I'll use C# Winform for this).

What i have done?
I have blocked a lot of online data storage sites but i don't want any website to let user upload anything without an alert and remark.

What I have tried:

What i have done?
I have blocked a lot of online data storage sites from server but i don't want any website to let user upload anything without an alert and remark.

Any Ideas, Tricks or Tips or Links are welcomed.
Thanking you!

Posted 31-Jan-17 0:33am

Awesh Vishwakarma

Updated 31-Jan-17 1:06am

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Richard MacCutchan 31-Jan-17 6:37am

I do not think you can do that with a Winform. You will need to install it on each PC in the domain, but that will not prevent the user from doing what they want.

Awesh Vishwakarma 31-Jan-17 7:00am

Then what programming language should i use to achieve this?

Richard MacCutchan 31-Jan-17 7:48am

None, there is nothing you can do to stop your users uploading files. Unless you close all access to the internet.

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OriginalGriff · Answer 1 · 2017-01-31T00:45:00

Solution 1

You can't do it in practice, and certainly not as part of a C# program.
And even if you could, it's sticking your finger in the dyke while the water is already pouring over the top: windows - Is there any browser or method to prevent uploading? - Super User[^]

Posted 31-Jan-17 0:45am

OriginalGriff

Comments

Awesh Vishwakarma 31-Jan-17 7:06am

I am trying to do like other data loss prevention software do. a Known program for this is Trend Micro.

Jochen Arndt · Answer 2 · 2017-01-31T01:06:00

I think there will be no solution that can cover all cases.

A common solution is setting up a HTTP proxy server on a system in your local net and ensure that all clients use it instead of direct internet access (e.g. by policies or redirection on the internet gateway / router). Then configure the proxy to block outgoing octet streams.

However, such restrictions can be circumvented and may have unwanted side effects (blocking wanted traffic).