[wp-trac] Re: [WordPress Trac] #2678: Nonces instead of referers

WordPress Trac wp-trac at lists.automattic.com
Wed Apr 26 17:55:55 GMT 2006

#2678: Nonces instead of referers
       Id:  2678            |      Status:  new                     
Component:  Administration  |    Modified:  Wed Apr 26 17:55:55 2006
 Severity:  normal          |   Milestone:                          
 Priority:  normal          |     Version:  2.1                     
    Owner:  anonymous       |    Reporter:  ringmaster              
Comment (by SilverPaladin):

 This solution tries to use a time check, but the logic doesn't work.

 This code here is the problem:
 >$i = ceil(time() / 43200);

 That takes the number of seconds since January 1 1970 00:00:00 GMT and
 counts how many 30 day chunks there have been.

 The nonce evaluation simply checks to see if you are in the same 30 day
 chunk of time. It does not say "this nonce is valid for 30 days."  In
 fact, if you visit this site with only one second left in the 30 day
 chunk, you will have 1 second in which to do all of your work.

 Additionally, all days within that thirty day chunk evaluate as being the
 same chunk.  So, as salt, $i really does nothing right now.  So I don't
 think a solution of "just check the next chunk too" is a good one. A nonce
 that can be valid for two months is not really time based, imho.

 Generally speaking when used for security purposes in applications, Nonces
 should be valid for as short a time as possible.  When used as a session
 key, this normally means a nonce is valid for minutes, not days.

Ticket URL: <http://trac.wordpress.org/ticket/2678>
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