Create Authentication Levels using 32bit

Anon

I am having difficulty explaining my problem be here goes, I am looking to create and authentication system based on levels. I want to assign each user a number (from a 32bit field). Then each page assign a another value made up from the sum of what users I wish ti access that page. See example below

Users values

Level1 = 1
Level2 = 2
Level3 = 4
Level4 = 8

Pages

index = 15
news = 3
accounts = 12

Who can access what?

All users can access index
Only level 1 & 2 users can access news (2+1=3)
Only level 3 & 4 users can access accounts.

And so on and so forth.

I have seen this done before and would be VERY grateful for any input as I have come to a dead end.

Thanx in advance
Marcus

trellie

looks like you're allready on your way...

where exactly are you stranded?

Anon

I think what you're trying to do is a binary AND

ie. index(15) & Level4(8) = 1 access granted

the following test should do what your looking for:

if ($page_value & $user_value)
{
user can access page
}
else
{

}

jacobee

Hmm, somehow I managed to post my response before I was done...

I think what you're trying to do is a binary AND

ie. index(15) & Level4(8) = 1 access granted

the following should accomplish what you want:

if ($page_value & $user_value)
{
user can access page
}
else
{
user cannot access page
}

I use something similar as the base for a user rights system where various rights are assigned a value as a power of 2(login = 1, post message = 2, admin = 4, etc.) and the user's rights (login + admin for example -> 5) are added up and stored as an integer in the user's database entry. Any page requiring a specific right for access performs an if($access_right & $users_rights_value) and redirects back to a common index page if a false value is returned. Does that make sense?

Anon

Yep thats gotit, after hours of trawling through the web i was getting there but couldn't find any examples, they all assume you know exactly what AND is. Any thanx a lot.