Active Directory: Limit Concurrent User logins
Bok Mull
You could enforce this limitation using the Technet scriptLimit concurrent logins in Active Directory,further detailed in the articleActive Directory: Limit concurrent user logins,using logon and logoff scripts with a file used as lock.
There is no default option in active directory let you to avoid a user to logon on many machine in same time.
you can create a custom solution to trace the user logon and logoff by creating a shared file when a user logon. Then you create a GPO to launch a a script when user logon and another script when he logoff to update this file and check if the user is already logged when he try to logon:
Then, you'll need a login script that kicks the user out if they've exceeded the limit of concurrent logins. The login script would read from the central server what the current login count is. Alternatively, you could have a service that modifies the maxlogins in /etc/security/limits.conf based on the value of the login count retrieved from the central server.
Limiting concurrent logins is not currently supported in Azure Active Directory. One workaround is that you could limit the login hour for the user, or you could enable Multi-Factor Authentication(MFA) to enhance the login security level and reduce the login risk. For example, once you enable MFA, you could require the user who is logging in to confirm by using a phone call or text code after entering the user password. This will have the same effect of restricting multiple users from sharing an account. (It won't prevent this fully, but it will make it more tedious to do.)
When you create policies in your Firebox configuration file, you can use specified user and group names. For example, you can define policies that only allow connections for authenticated users, or you can limit connections on a policy to particular users.
For both individual users and user groups, you can also enable login limits. When you enable unlimited concurrent logins for a user or group, you allow more than one user or member of a group to authenticate with the same user credentials at the same time, to one authentication server. This is useful for guest accounts or in laboratory environments. When the second user logs in with the same credentials, the first user authenticated with the credentials is automatically logged out. The other option you can select for user and group login limits is to limit your users or members of a group to a single authenticated session. If you select this option, your users cannot log in to one authentication server from different IP addresses with the same credentials. When a user is already authenticated and tries to authenticate again, you can select whether the first user session is terminated when the additional session is authenticated, or if the additional session is rejected.
I run a Meraki network that is integrated via splash page with our windows 2012 windows servers. We use Active Directory to allow access to the internet, and would like to keep it limited to a number of devices per user. However, we want more than one. Most teachers have 2 laptops at our school as one is used for a smart board and the other for their work they don't want kids to see.
Right now our only options are unlimited logins by enabling Allow simultaneous devices per user, in the ssid, or a limit of just one. Is there any way to set this to 2 devices? I did see some options for using a radius server, but we were hoping to keep it to just AD.
This process creates in the C:\program files\limitlogin folder the LimitLoginMMCSetup.exe utility, which, when run, integrates LimitLogin directly into the AD Users and Computers snap-in, providing a new LimitLogin Tasks context-menu option. This option opens the LimitLogon configuration for the user, which displays the current sessions, as the figure shows. (You'll need LimitLogin installed on each machine that runs Active Directory Users and Computers. To do so, execute the LimitLoginADSetup.msi file and during the setup options, select the "Install LimitLogin Active Directory MMC snap-in integration tools on this machine" option).
LimitLogin also provides a script--Bulk_LimitUserLogins.vbs--that lets you define quotas for all users in the domain. If you want to use this tool simply to see logged-on sessions, give users a high quota limit (without quotas enabled no user-session tracking occurs) that they'll never reach.
Does anyone know how to limit concurrent radius logins with ISE. I am running version 2.1 and I can't seem to find the place where I can set this. I don't do onboarding and I don't use the guest system. I just want to limit the basic radius authentication either by concurrent connections or perhaps by AD users?
Limiting this on AD won't work for us, as we use these accounts for BYOD and for local device logins. Limiting this on the WLC also won't work as we don't want to limit this for everyone, and limiting it on the controller is a global setting.
I've seen this on various servers before, and I was wondering how I could set this up myself. Perhaps in those cases, this was accomplished by limiting the number of active SSH logins per user? And I guess that would be the way to go. How would I set this up?
We recently went through an audit where there was a request for us to limit/disable the concurrent logins for admin accounts. The general idea is: how do we make it hard for a rogue admin to be malicious, and also how do we know that the logged in admin accounts are not compromised (hacker logged in with admin).
Concurrent logins give users extra flexibility by allowing them to log on to the network from multiple endpoints simultaneously. However, compromised credentials could be used by illegitimate personnel to log in at the same time as the legitimate user to authenticate to the network. This could also lead to multiple security issues within the organization like misuse of the user's personal information or resources they have access to. This concurrent login vulnerability can also result in the user being wrongly held accountable for the malicious actions of another user.
When the Deny Concurrent Login option is enabled, if a user closes a browser that has an active ADSelfService Plus session, the user will not be able to log in until the idle session time expires. To avoid this inconvenience, the admin can terminate the user's session so that they can log in again.
CA SiteMinder Tuesday Tip by Jeff Tchang, Limiting a user to a single login for 5/31/2011
A common ask for many clients is to only have a user login from one place at one time. While SiteMinder does not have this functionality out of box there exists a module called Limit Concurrent Login that fulfills this role. The Limit Concurrent Login Add-On Services component accomplishes this by only allowing the last good login to be active. It requires a session server.
To learn more look up CA SiteMinder Web Access Manager Limit Concurrent Login Add-On Services Component.
While there is no limit on the number of simultaneous connections by a single login, other than the usual @@MAX_CONNECTIONS value, using one login for multiple users or developers is generally frowned on because doing so makes it difficult or impossible to limit permissions on a per-person basis. (You may still be able to identify/contain people based on something like a workstation name, but this would require much hackery on the DBA's part, while simply using seperete logins addresses the issue.) Such "well-known" logins also have a way of getting hard-coded into things, along with the well-known password, and then developers and users become very resistant to ever changing that password. With so many ways to get onto a corporate network these days (a rogue LogMeIn running somewhere, for example) being able to turn database access off via an AD group is beneficial.
Using a single login for a web application, which can have many simultaneous users, is more common. It might not be feasible to give out SQL Server logins or AD logins to individuals for large sites (for example, facebook). In that case, there is a benefit in that IIS can use connection pooling.
Captive Portal can also optionally rate-limit users to keep them from usingtoo much bandwidth. The Default download and Default upload fieldsdefine the default values for user bandwidth, specified in Kilobits persecond. These values can be overridden by RADIUS(Passing back configuration from RADIUS Servers) for different limits for specific users. Ifthe fields are blank or set to 0, then users have unlimited bandwidth.
If enabled, the portal sends Access-Request packets to the RADIUS serverfor each user that is logged in every minute. If an Access-Reject isreceived for a user, that user is disconnected from the captive portalimmediately. This allows actively terminating user sessions from the RADIUSserver.
If reauthentication is combined with RADIUS accounting, Interimaccounting updates must be used to track usage during sessions, otherwisethe RADIUS server will not know if a user exceeds limits until they logout.
The portal sends START and STOP records and also periodically sendsupdates to the server while a user session is active. This method is lesslikely to lose session data if the firewall restarts without notifying theRADIUS server of a STOP message, but will cause increased database usageon the RADIUS server.
RBAC in Active Directory is a security model that assigns users specific roles based on their job functions. Each role has defined permissions, limiting access to only necessary resources. This ensures users have the minimum privileges required, enhancing security by reducing the vulnerability bandwidth.
Unlimited concurrent logins results in resource exhaustion within your AD environment. If a single user establishes multiple simultaneous sessions or if unauthorized users gain access, it strains system resources, impacts performance, and potentially leads to service disruptions or denial of service (DoS) situations.
e2b47a7662