Do not encrypt the values. You should send the values via a back
channel with a non-spoofable, non guessable, time limited (i.e. <2
min) token that is passed to the user and then the user is passed to
the new server (i.e. a client-side redirection using HTTP 3xx series
status codes).
Encrypting the values means that you need a way to share keys
securely, rotate keys, etc. What a total PITA.
-dhs
Dean H. Saxe, CISSP, CEH
[EMAIL PROTECTED]
"Dissent is the purest form of patriotism."
--Thomas Jefferson
On Jul 29, 2008, at 3:28 PM, Ajas Mohammed wrote:
Hi,
I am implementing single sign on and after I verify user
credentials, I have to redirect user to secure area which has its
own login verification through uname pwd textbox, the usual way.
The idea with single sign on is to avoid that login verification
page. So, while redirecting user to secure area, I am planning to
pass 2 parameters in cflocation i.e. 1. to indicate its single sign
on, so in Application.cfm for secure area folder, I can set client
variables 2. the encrypted value of random key generated using
GenerateSecretKey func.
here is some code/logic
<cfset redirectToSS = "whatever">
<!--- generate a key, the alogorithm, encoding variables are set
before this --->
<cfset key = GenerateSecretKey(algorithm)>
<cfset redirectToSS = Encrypt(redirectToSS,key,algorithm,encoding)
<cfset encKey = Encrypt(key,"sometext")>
<cflocation url="../secureArea/MyHome.cfm?
redirectToSS=#redirectToSS#&vartest=#encKey#" >
Now in secureArea/Application.cfm
I will use redirectToSS and varTest. First decrypt varTest to get
keyvalue and then use key value to see whats in redirectToSS.
So,
<cfif redirectToSS eq "whatever">
set client variables that are needed to access application.
</cfif>
Does this makes sense? Is this approach safe, security wise,
considering no one knows what algorithm, encoding iam using to
encrypt redirectToSS and also the fact that the key is sent over
encrypted.
I am I missing something important here? Any holes in this approach?
Thanks,
--
<Ajas Mohammed />
http://ajashadi.blogspot.com
We cannot become what we need to be, remaining what we are.
No matter what, find a way. Because thats what winners do.
You can't improve what you don't measure.
Quality is never an accident; it is always the result of high
intention, sincere effort, intelligent direction and skillful
execution; it represents the wise choice of many alternatives.
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