On Tue, Feb 24, 2015 at 09:15:11AM +0000, Bloemen, Jurriën wrote: > Hi, > > In FreeIPA you can create users and restrict on which hosts the user can > login to. This is all great and works fine. > > If a user1 is logged in to a system. Knows the password of user2 and issues > the command "su" to be that user2 on that same system. This is not allowed > because the user2 does not have HBAC rules for that system. This is as > expected. > > But if the user root tries the "su" command to be user2 is works despite the > fact that user2 has no HBAC rule for that system. > > Why does this works? Is there a way to prevent this? Or is this something in > "su" that it works like the way it does?
It is the PAM configuration of su, e.g. on F21 it looks like this: #%PAM-1.0 auth sufficient pam_rootok.so # Uncomment the following line to implicitly trust users in the "wheel" # group. #auth sufficient pam_wheel.so trust use_uid # Uncomment the following line to require a user to be in the "wheel" # group. #auth required pam_wheel.so use_uid auth substack system-auth auth include postlogin account sufficient pam_succeed_if.so uid = 0 use_uid quiet account include system-auth password include system-auth session include system-auth session include postlogin session optional pam_xauth.so If you are root authentication is skipped with pam_rootok.so and access control by 'pam_succeed_if.so uid = 0 use_uid quiet'. You can change this if you want but is is not very useful because there are various other way for root to become user2 without calling su. root can do everything on the local system. HTH bye, Sumit > > Best regards, > > Jurriën > > This message (including any attachments) may contain information that is > privileged or confidential. If you are not the intended recipient, please > notify the sender and delete this email immediately from your systems and > destroy all copies of it. You may not, directly or indirectly, use, disclose, > distribute, print or copy this email or any part of it if you are not the > intended recipient > -- > Manage your subscription for the Freeipa-users mailing list: > https://www.redhat.com/mailman/listinfo/freeipa-users > Go To http://freeipa.org for more info on the project -- Manage your subscription for the Freeipa-users mailing list: https://www.redhat.com/mailman/listinfo/freeipa-users Go To http://freeipa.org for more info on the project
