Question

Cannot save code to server

Asked by: cstcfu

I am using ASP.net to write a web-based code editor. I use the component asp:Textbox for typing code.

When I want to a file (e.g. aspx, html.......) to the server, a warning message: ".......potential dangerous ...save with "<" tag....." .

I think it should be the server setting problem. It seems that the server checking some special characters like <, > and block them. How can I disable this checking?


Pls help ~~

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Asked On
2004-01-30 at 20:35:04ID20868743
Topic

.NET

Participating Experts
4
Points
125
Comments
6

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Answers

 

by: meet_zorrerPosted on 2004-01-30 at 22:32:27ID: 10241157

Well, You sould HTMLEncode your textbox contents before saving it to a file as the ">" will be converted to "&gt", but by doing

this you will only be able to show html files properly not the coding files like aspx,

also it is dangeros that you give users to create aspx file by there codings and save it to server for later execution

 

by: meet_zorrerPosted on 2004-01-30 at 22:35:28ID: 10241162

Server.HTMLEncode( txtMyCode.text )

 

by: rovermPosted on 2004-01-31 at 03:02:10ID: 10241675

You can also disable the warning by adding "validateRequest=false" to your page directive:

<%@ Page validateRequest=false Language="vb" AutoEventWireup="false" Codebehind="test.aspx.vb" Inherits="MyTest.test"%>

D'Mzz!
RoverM

 

by: msdixonPosted on 2004-01-31 at 07:03:45ID: 10242301

use the "ValidateRequest" approach. you don't want to store html in the database as encoded html.

 

by: farsightPosted on 2004-01-31 at 12:27:13ID: 10243699

Beware the security implications of  "validateRequest=false".
Cross-site scripting.  etc.
You should probably implement these checks in code anyway to be safe.

  Adding Cross-Site Scripting Protection to ASP.NET 1.0
  http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/scriptingprotection.asp

This applies in 1.1, too, if you disable validateRequest, or if you haven't updated 1.1 with certain hotfixes.
  ASP.NET 1.1 Request Validation flaw
  http://securecoder.com/News/archive/2003/11/12/152.aspx

 

by: meet_zorrerPosted on 2004-01-31 at 21:29:34ID: 10245576

Well,
when you save html files in database the HTML Encoded files will 100% safe to display in any browser
and  internet browsers show the real text when you view the file not the html encoded like "&gt" will be shown like ">"

so suggest you go with security and ease of mind as it will work on any browser, any .Net version :)

20120131-EE-VQP-002

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