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   Author  Topic: DBMS_ASSERT  (Read 3905 times)
Pete Finnigan
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DBMS_ASSERT
« on: Nov 13th, 2005, 6:52am »
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Hi,
Just read the post about DBMS_ASSERT, great package. but much better approche for that will be if oracle will create new datatypes like a varchar that only allow A-Z,a-z,0-9 or a datatype that replace each ' with '' etc...
 
That will be just the best solution.
 
Oded.
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Re: DBMS_ASSERT
« Reply #1 on: Nov 13th, 2005, 8:50pm »
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Hi Oded,
 
Thanks for your post. Actually that is quite a good idea to help prevent SQL Injection. It is worth exploring anyway to see if there is merit in it, i.e. would it work and actually help SQL Injection prevention.  
 
I think also to remember is the fact that a better way to prevent SQL injection is to not use concatenation in the first place and to use binds.
 
nice idea though,
 
cheers
 
Pete
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Pete Finnigan (email:pete@petefinnigan.com)
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Pete Finnigan
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Re: DBMS_ASSERT
« Reply #2 on: Nov 17th, 2005, 12:07am »
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>I think also to remember is the fact that a
>better way to prevent SQL injection is to
>not use concatenation in the first place  
>and to use binds.  
 
The problem is you can't use binds for table names. If you look at the PL/SQL Injection issues that Oracle's falling to you'll find a large number of the injection points are table names. As such there'll always be concatenation...
Cheers,
David Litchfield
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Pete Finnigan (email:pete@petefinnigan.com)
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Pete Finnigan
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Re: DBMS_ASSERT
« Reply #3 on: Nov 17th, 2005, 10:34am »
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Hi David,
 
Thanks for your post. I think we are talking at cross purposes. I was talking general protection against SQL Injection in user written code rather than how Oracle might fix their own bugs. I think that the OP was talking about how to protect against SQL Injection in his own code? - DBMS_ASSERT is a good start for developers - i referenced your excellent paper in my blog the other day. Also the OP's idea about having bounded data types is worth exploring.  
 
On your point yes, I agree that it is not possible to use schema elements as binds in NDS or DBMS_SQL. Oracle will need to ensure that the input to the concat cannot be fed in from outside the function/procedure and also use DBMS_ASSERT to validate the schema object name/owner - I guessed that this was the purpose for the relevant functions in DBMS_ASSERT.
 
cheers
 
Pete
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Re: DBMS_ASSERT
« Reply #4 on: Nov 18th, 2005, 12:48pm »
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Hi,
Yes, i was talking about a way to protect against SQL Injection in developers code and not oracle's
 
I was thinking about creating those data types by using oracle objects capabilities with a constructor function. and publish it in my blog.
 
 
Oded Maimon.
 go-oracle.blogspot.com - (broken link)
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Pete Finnigan (email:pete@petefinnigan.com)
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Pete Finnigan
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Re: DBMS_ASSERT
« Reply #5 on: Nov 18th, 2005, 1:51pm »
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Hi,
 
That sounds like a plan, let us know when you have tried it. I for one would like to see how you get on.
 
cheers
 
Pete
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