Description of problem:
There is an alternate version of pam_krb5 in use by other Linux distribution (SUSE, Debian, Ubuntu). It contains some features which are required by my environment (prompt_principle, alt_auth_map, search_k5login). If these features could be added to the Fedora/RHEL module that would simplify my deployment while not interfering with existing configurations.
At my site I've got systems with controlled access. The systems are configured for */root principles, but there isn't an elegant way to require use of that principle for login rather than their non-compound principle.
I also have a set of systems which require a shared account, but I cannot give them a shared password. The users are all configured for kerberized ssh into the system as the shared user, but they also need local login to the shared account.
Version-Release number of selected component (if applicable): all
How reproducible: always
Steps to Reproduce:
1. need to map kerberos compound principles to traditional user names, can't
1. have a shared account, but policy forbids shared passwords
2. all users of the shared account are in the k5login
3. users need local auth to the shared account
No elegant solution except replacing pam_krb5 with a 3rd party application.
A way of making these changes without going outside of the tree.
The GPL code for this other module is at http://www.eyrie.org/~eagle/software/pam-krb5/
Our component of choice is SSSD. I doubt we will do any significant changes for pam_krb5. But we are open to enhancements to SSSD. Ubuntu, SUSE and Debian carry SSSD too so you will get the same experience across.
Can you please provide a detailed description of the features you need?
It seems that I am missing something as .k5login seems to provide aliasing you are looking for. The top of the post talks about several features but the bottom seems to drill into only one.
Also from the description above some things sound really not inline with best practices so there might be some push back from the community.
I will confess a limited understanding of SSSD. I'll have to go read some doc on that. If this makes more sense over there, thats fine with me.
As for a more detailed description. For the mapping of identities, lets say I have principles 'jcpunk@EXAMPLE.COM' and 'jcpunk/admin@EXAMPLE.COM' and, on certain sensitive systems, I want to force the use of /admin@EXAMPLE.COM principles for all logins. Right now, if I were to sit in front of the system and try to login as 'jcpunk' the system would attempt to authenticate 'jcpunk@EXAMPLE.COM' rather than 'jcpunk/admin@EXAMPLE.COM'. One of the features of this alternate pam_krb5 is to change that behavior and adjust the principle being authenticated. The current pam_krb5 simply slaps a domain on the end of the provided username. I'd like some more control.
As for 'prompt_principle' and 'search_k5login', at my site I have a weird issue on certian systems where the username required for operations does not (and cannot) match the kerberos principle in any meaningful way. These features allow me to effectively alias a user to an apparently unrelated kerberos principle. If, for example, I needed to login to the system as 'pat' but also needed the kerberos rights of 'jcpunk@EXAMPLE.COM' these features provide two ways of doing this (the one simply asks for the principle and the other checks .k5login for it). I realize the first idea that comes to mind is login and then kinit, however, the home area is kerberized NFS so I need both the user and principle at login or no dice. The .k5login works just fine for GSSAPI auth, but, for local logins where no ticket yet exists, it doesn't help.
I hope this was more helpful.
This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle.
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