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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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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1k views

Apache mod_auth_kerb: “Key table entry not found”

I want to use the Apache Module "mod_auth_kerb" to implement SSO for a Webapplication. With the following config: <VirtualHost 10.5.3.200:443> #Proxy <Proxy *> Order deny,allow Allow ...
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238 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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6 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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19 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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38 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
34 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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38 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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657 views

Multiple PCs network centralized system authentication

(I couldn't really choose an accurate title as I don't know exactly what the feature I'm looking for is called. Sorry about that. I hope that the following lines may clear this aspect.) I own a dozen ...
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1answer
118 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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64 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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167 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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32 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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120 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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1answer
62 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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28 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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1k 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
28 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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381 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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47 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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1answer
76 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
75 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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74 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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64 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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166 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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449 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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91 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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293 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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363 views

kdb5_ldap_util fails with cryptic error

Supposedly, in order to set up Kerberos, I need to run kdb5_ldap_util, though I'm not sure why. However, it fails with: # kdb5_ldap_util -D cn=admin,dc=example,dc=com create -subtrees ...
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1answer
84 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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32 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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284 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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5k views

Automatic kerberos ticket initialization on login

I'm using ksshaskpass to add my password protected keys into ssh-agent upon logging into KDE, is there something similar for kerberos?
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243 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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1answer
541 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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414 views

Is it possible to attach `kinit` to the first attempt to `ssh` without a Kerberos ticket?

My university uses Kerberos-based authentication for login to our unix servers. One way to get passwordless login is to run kinit, type my password, and then run ssh@host. For this setup, I do the ...
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660 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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4k views

How could I eliminate Kerberos for passwd?

When I issue a command to change my password like this: sudo passwd huahsin The system prompt me: Current Kerberos password: I don't know what I have done to the system configuration, how could I ...
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132 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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85 views

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
2k views

How does Linux winbindd determine available domain controller?

We are actually in preparation of taking down one of our three domain controller (Win2k3). They are all serving the same domain. Actually we still see connections incoming from Debian (5/6/7) Servers ...
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1answer
124 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
339 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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138 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
282 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: ...
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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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1answer
488 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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1k views

How to set up Active Directory authentication on CentOS 6.5?

I have: 1. A CentOS machine to which I have SSH and STFP access. 2. The machine is on network where there is a MS SQL Server database and Windows shared drives. 3. All authentication seems to be with ...