Question

coldfusion: how to prevent multiple logins from a single account using cflogin

Asked by: henrygibson

i am working on a new site and am using cflogin for the first time. have got everything working great but have a problem i need to solve somehow.

there are a number of user accounts on the site but each individual user (i.e. id#, username / pass) should only be able to login once. It shouldn't be possible for me to login with one set of credentials on one machine, then move to another machine and login using the same credentials without first logging out of my first session.

has anybody implemented a simmilar feature and can you give me some ideas on the best way to do it. am thinking there should be some way to set a marker against an account at login and delete it once the user times out or their session expires - but not wholly sure how to handle that robustly.

thanks, h

ps. site is running cf8 with bits of jquery ajax & running on a windows 2003 platform if that helps, although ideally I'd like to keep the solution platform independant and wholly within coldfusion if possible?

<cflogin idletimeout="#REQUEST.time_logout#">
    <cfloginuser
        name="#user_login_query.id_user#,#user_login_query.nameFirst_user# #user_login_query.nameLast_user#"
        password="#FORM.pass_user#"
        roles="1,#user_login_query.level_user#"
    >
</cflogin>

                                  
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Asked On
2009-06-24 at 03:16:09ID24517529
Tags

coldfusion cflogin cfapplication

Topics

ColdFusion Application Server

,

Web Application Hosting

Participating Experts
2
Points
250
Comments
3

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Answers

 

by: azadisaryevPosted on 2009-06-24 at 03:31:26ID: 24699735

in onApplicationStart() event in your Application.cfc (your are using Application.cfc vs Application.cfm, right? you have evolved into the 21 century, i hope) create a structure in application scope (i.e. <cfset Application.usersloggedin = {}>) to store currently logged in users (i.e. either their user id, or username/passowrd).

then in you cflogin procedure check that structure to see if the user is already logged in. if the user is found in the structure, show an error message. if not - save add the user id to that structure and log the user in.

Azadi

 

by: henrygibsonPosted on 2009-09-10 at 11:13:32ID: 31595841

sorry, didn't make sense first time I read it, but now I see. Yep, that's excellent. I'll just make a struct on the application scope to hold the IDs of all the currently logged in users and validate against it whenever there is a new login.

Is there any way for something to go wrong with the users session, so that they don't get logged out properly? If that happened they might need to login again, but couldn't because the struct would say that ID is still logged in.

 

by: hefterrPosted on 2011-04-09 at 13:52:06ID: 35359143

How do you control Where the user is logging in from?  You cannot for the user to log out.  So what do you do if a user :
- Logs in to app
- closes browser
- logs in again

You want to permit this if it's from the same workstation (IP address, cookie, client variable)??

hefterr

20120131-EE-VQP-002

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