Kerberos is a network authentication system based on shared key cryptography. It is the underlying authentication system used by current versions of Active Directory and is widely used by large organizations.

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When using an SSH alias, why is SSH ignoring my (valid) Kerberos ticket?

I am successfully connecting to my university's network via ssh with Kerberos ticket authentication. Normal, verbose operation (kinit a ticket, then ssh user@hostname) works fine. When setting up ...
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kerberos preauth pkinit failed to initialize: No realms configured correctly for pkinit support

I have successfully installed Kerberos on debian wheezy and can perform service authentication (Apache, ssh) with Kerberos tickets from kinit. I would like to use certificates for kinit (pkinit) ...
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43 views

Kerberos/Samba can't join Active Directory [DEBIAN 8]

I have an issue when I try to join my domain. I am able to create the kerberos ticket successfully. root@debian:~# kinit Administrateur@ASP.DOMAIN Password for Administrateur@ASP.DOMAIN: ...
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kerberos: Why sudo command creates a ticket?

I have successfully set up a kerberos (MIT) / OpenLDAP debian server which can authenticate users with kerberos and get SSH access according to OpenLDAP groups. I must mention that as this is a ...
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1answer
20 views

getent group working, but sshd_config allowgroups does not retrieve appropriate group

I am trying to setup Kerberos MIT authentication with OpenLdap autorisation on Debian Jessie. Authentication part is working great, as I can login to SSH using my kerberos account. I even can create ...
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2answers
26 views

Renew Kerberos ticket for daemon

Using ISC-DHCPD to renew DHCP leases in an Active Directory domain. This requires using ktutil to generate a keytab for DHCPd to use in order to update secure dynamic DNS. What I need to do is to be ...
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1answer
21 views

How can I set kerberos principal in environment automatically on the remote host?

I use both legacy krsh and ssh to login to a variety of boxes for root administration, as do several colleagues of mine. We all keep different history files by use of a variable calculated by running ...
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52 views

Issue with mount and kerberos authentication

I am not a sysadmin but a software engineer, but for my current project we need to use kerberos authentication between a linux server and linux client and I am having some issues so I hope you guys ...
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40 views

Can a Linux server that authenticates against an Active Directory accept public/private keys for passwordless login?

I have a Linux server that authenticates users against an Active Directory. Now interactive logins require username and password and automatic login requires a keytab (Kerberos) for passwordless ...
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7 views

Kerberos in Ubuntu system

I would build a kerberos authentication system on Ubuntu based machines. I'm making it for a school project. So i have some questions: 1)What do i need to make client-KDC-server? Do i need a domain ...
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36 views

How to keep a long-running process run with Kerberos and Andrew file system?

I am running a bash script on a Scientific Linux server. The script has a loop for copying files and running some programs. The process for running the script probably takes a day or two. But I always ...
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56 views

after power outage no permissions to access samba share from windows machines on the same domain

I am running a ClearCase server on RHEL 6.7. We had a power outage last night (for the life of me I do not know why we don't have damn UPS). At any rate, when the machine was brought back up, we are ...
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1answer
44 views

Is it possible to have a daemon run a process as another user WITHOUT having a superuser daemon?

I'm working on a project at the moment where I have a daemon that needs to run a process as another user. I would like the daemon to not run as root if possible. However, i'm struggling to figure out ...
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2answers
684 views

Failed to join domain: failed to set machine kerberos encryption types: Insufficient access

did someone have this error when try to join CentOS 7 to Active Directory. I tried on a various ways(via cli, gui, tui) and always get same error. Failed to join domain: failed to set machine ...
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1answer
69 views

Can not stop Kerberos on debian 8

I'm trying to install krb5-admin-server and krb5-kdc for a school project, everything is working fine but I can't stop krb5-admin-server nor restart it. Here are the logs I retrieved with cat ...
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1answer
266 views

Kerberos DNS issue with /etc/hosts

Thank you all for your time and attention. Very simply I'm getting this error when invoking kinit to test kerberos authentication against my AD domain (which is hosted on a Server 2012 box). The ...
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2answers
35 views

The easiest way to update package above release RHEL

I have to install the krb5-devel package in a version at least 1.12 on a RHEL 6.6. Unfortunately the RHEL 6.6 repositories contains the package in a version 1.10. What would be the easiest way to ...
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1answer
123 views

FreeTDS missing encryption support to connect to MS SQL

I'm running a Gentoo Linux and I'm trying to connect to MS SQL via pyodbc using freetds. I enabled the debug log in freetds. Now when I try to connect I'm seeing this: 18:13:00.841828 13523 ...
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172 views

realmd join AD and Cross Domain Auth

Small issue with realmd, I use realm join with a kerberos token generated before the join, it's working fine on a simple Active Directory Configuration My issue is when realm join must join a domain ...
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37 views

Facing issue while integrating RHEL 6.5 with windows AD

I was integrating my RHEL linux servers with AD. For some servers the integration was completed successfully. For one server I am facing issue,whenever I try to join its showing below error, ...
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2k views

Adding CentOS 7 to Active Directory

I am having a hard time adding a CentOS 7 machine to my domain (Active Directory 2012 running in Windows 2008 mode). I am using realmd to join the machine to the domain. Here is what I have checked so ...
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1answer
29 views

OS X Directory Services

I have been reading from Advanced Programming in the UNIX environment (Stevenson and Rago), and I am currently reading about how user data is stored on various systems, including Linux, FreeBSD, and ...
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1answer
99 views

How can I run unattended processes as authenticated AD/LDAP users?

I'm switching some servers over to Debian 8 and using realmd for Active Directory (LDAP/Kerberos) authentication. This has been working great and allows Domain Users to login to my server, etc. ...
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1answer
622 views

Allow username input sddm (LDAP/Kerberos)

The overarching question: How can I enable SDDM to accept username input in Debian? Underlying/implicit questions: How does SDDM recognize users? What is the Debian alternative to ...
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94 views

Can't add any principals in Kerberos

I recently botched a Kerberos install and have been trying to follow the walkthrough here. However, now I've reached an awkward impasse and cannot add any principals. Using kadmin.local I receive ...
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148 views

How do I disable Kereberos preauthentication?

I'm seeing this error message: NEEDED_PREAUTH: admin@THIS.LAN for for kadmin/admin@THIS.LAN, Additional pre-authentication required How do I disable Kerberos pre-authentication? The server and ...
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1answer
59 views

Kerberos/LDAP login fails - remove Preauth?

Using a Debian system with a Kerberos/LDAP client - login fails on KDE as a user directory isn't being created. SSH is successful (and no directory is created); however, desktop login isn't. I've ...
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80 views

Where are AFS tokens stored, and how do I get them into running Screen session

I have the following situation, I have a running GNU screen session where I can't access AFS anymore - my token has expired. I can however access it from a new shell. The difference to this question ...
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1answer
87 views

Troubleshooting GSS-API error on one client authenticating to Kerberos

When authenticating to kadmin with one client of many, it fails with kadmin: GSS-API (or Kerberos) error while initializing kadmin interface. The Kerberos host is specified with its subnet ...
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1answer
258 views

How can I use different kerberos principals for sudo than for system-auth?

At my organization, we're required to use different kerberos principals when authenticating for sudo than for other types of auth, such as logging in. For instance, my regular (login) principal might ...
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1answer
674 views

Why is my kerberos ticket not working?

I'm trying to ssh to another machine but my kinit is not working: $ ssh nik@social-1-r.referens.sys.XXXXXXX.se Permission denied (publickey,gssapi-keyex,gssapi-with-mic). Kerberos is used for ...
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102 views

How can I install kerberised services on debian?

I installed kerberos in my debian environment and made it work with SSH. I also would like to try it with other services but I could not install them on debian. I followed several tutorials e.g. ...
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367 views

RSAT : Samba 4 Server not operational

Samba 4 now supports GPO and management through the Active Directory Windows console. But, when I open it after installation, I cannot access the server nor the domain. The message returned is that ...
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1answer
282 views

oddjob_mkhomedir doesn't run when logging in via SSH with Kerberos

I currently have a server which has Kerberos/SSSD/Samba to authenticate to Windows 2012 AD. In /etc/pam.d/system-auth oddjob_mkhomedir is set as below: session optional ...
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124 views

Not permitted to access my files on $HOME in tmux after log out and log in

My $HOME on a server is in a Andrew file system, and the server runs kerberos. I created a tmux session, wherein I ran a shell process. Then I detached it, and logged out, and after a while logged ...
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37 views

permission for accessing files are denied and some sessions are killed

I ssh to a Linux server which runs kerberos. This is the first time I met Kerberos. After some time of being idle or loging out and loging in, I found some strange things, which I am not sure if are ...
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358 views

Kerberos Join Active Directory Failure

I try to join Active Directory and Samba 4 in Ubuntu 12.04.05. When I run host -t SRV _kerberos._udp.test.sg I get the error: Host _kerberos._udp.test.sg not found: 3(NXDOMAIN) meanwhile $# host ...
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157 views

Utilizing Samba Shares Without using Winbind

I am curious if it is possible to use samba shares without using winbind. In our current environment we are using SSSD, Kerberos, and Samba to complete the required tasks such as joining the windows ...
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kerberos : kinit not picking up updated values in krb5.conf

We are running kinit from our Linux command line and this works well. Before we run kinit we set the KRB5_CONFIG environment variable to point to directory continaing krb5.conf file linuxhost1$ ...
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1answer
762 views

Can't Login to Debian 7.7 with Kerberos/NIS user

I have a Debian 7.7 system I am trying to configure to use Kerberos and NIS, both served from an Active Directory server. I have kerberos set up such that I can kinit a set of credentials from the AD ...
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1answer
139 views

What role does krb5.conf actually play when joining a Linux machine to AD via Samba/winbind?

I'm working on a project for a standardized Linux image for our organization. This image will be domain joined, and I've written a script to fire on boot that will guide the IST person doing the ...
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3answers
1k views

Kerberos error after ArchLinux installation

I've installed ArchLinux successfully on my laptop yesterday. To do this, I've followed the Beginner's guide along with the Raid guide. I could do every step without problem, except the one for the ...
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1answer
426 views

How to automate ktutil to immediately list keytab entries?

I use MIT ktutil a lot on Linux and I am fed up using the following sequence, even if command shortcuts and file name completion are here to help: ktutil rkt my.keytab l Isn't there a way to get ...
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281 views

Kerberos Forwarding in SSSD

So, I'm trying to set up forwarding with Kerberos and seem to have some problems. On some of my servers I'm able to forward after receiving a ticket; however, some I'm not. My system setup is a ...
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166 views

List Kerberos principals with valid TGTs

Is it possible to query my (MIT) Kerberos KDC to return a list of principals who have been issued TGTs that are currently valid? My use case is that I would like to find out which users are currently ...
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1answer
663 views

Understanding Kerberized NFSv4 Authorization

Articles such as this one seem to point out that Kerberizing NFS(v4) mounts not only prevents machines without a Kerberos service ticket from mounting the shared directory but also uses the user's ...
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2answers
2k views

How would I build a linux based router?

I am looking into building a Linux based router out of a home-built Linux server. I don't have much experience with the software required however. I would like the server to run the following ...
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541 views

Kerberos authentication fails with forced password change

I have configured PAM authentication to use Kerberos and can authenticate correctly with my principals using their Kerberos credentials. I ran into trouble when I tried to create a principal with an ...
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1answer
2k views

Get a Kerberos service ticket from the command line

I am in the process of debugging a Kerberos setup. I have a valid krb5.conf and I can call kinit USERNAME to get a Ticket Granting Ticket (TGT): Credentials cache: /root/krb5cc_root Default ...
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1answer
318 views

Integrating LDAP and Kerberos V to add users via a useradd-like interface

I'm currently trying to set up an integrated Kerberos V/LDAP system for authentication/authorization. From what I have managed to gather, there are at least two ways to integrate Kerberos V with LDAP: ...