Kerberos is a computer network authentication protocol, which allows nodes communicating over a non-secure network to prove their identity to one another in a secure manner. Its designers aimed primarily at a client–server model, and it provides mutual authentication — both the user and the server ...

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Joining Linux host to Active Directory fails to update Microsoft DNS

I am joining Linux hosts (CentOS 6) to Active Directory using a special bind account. I've granted delegate permissions to this user and when I join on the default Computers OU, a computer object is ...
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27 views

How can I audit Ip adresses of users logging into system?

I have a group of servers which use Kerberos for authentication. We distribute keytabs to users but want to ensure that a user never pass their keytab to someone else. Essentially we need to audit the ...
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1answer
74 views

Privileges when doing sudo to another domain user

Suppose I have a corporate domain mydomain using MS Active Directory. In the domain I have the users myuser and youruser. Now, on one specific Ubuntu machine mymachine, myuser has sudo rights, and ...
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678 views

Windows 7 versus 8 Access CNAME'd Share

Here's a situation that came up yesterday: we have a share on a machine we have to access using an alias (CNAME). The machine is running Windows Server 2012 R2, and services Windows 7 and 8 clients. ...
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113 views

kdm and ssh detecting different fully qualified domain name when using kerberos authentication

I'm attempting to setup Kerberos login support (Windows AD domain providing the kerberos) for Kubuntu 12.04 Linux workstations at the company I'm at. It's almost completely working but I can't get ...
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2k views

How to avoid frequent KVNO increases, when using Apache HTTPD with mod_auth_kerb talking to AD?

I've setup Apache HTTPD 2.4 with mod_auth_kerb, created a service account on Active Directory, added a SPN for my http hostname, created a keytab file on the linux machine, and had SSO start working ...
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284 views

Samba authentication and LDAP

I have an OpenLDAP server that I use for authentication and authorization for various services. All users are of object type inetOrgPerson and my groups are groupOfNames. Now I want to configure ...
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1answer
765 views

Ubuntu 14.04 Failing to join domain for Integration with Active Directory (winbind & samba)

I've followed the tutorial at this link https://help.ubuntu.com/community/ActiveDirectoryWinbindHowto Everything seems to be configured somewhat correctly, net rpc join worked and the realm is listed ...
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1answer
116 views

Active Directory: Permissions to get Kerberos Service Ticket

I have an Active Directory with a KDC running on Windows Server 2012. At the moment, every user can request service tickets for every service from the TGS. I'm looking for a solution where the KDC ...
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1answer
101 views

Does “Kerberised” NFSv4 securely protect against a malicious client spoofing the user

I have read conflicting statements about whether shares exported via NFSv4 with sec=krb5 are cryptographically protected against a malicious client mounting the share and then spoofing the user to ...
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2answers
932 views

Apache 2.2 mod_auth_kerb SSO stopped working

I'm all out of ideas why has it just stopped working, here's what I checked: httpd-error.log: [Thu Jun 11 18:04:21 2015] [debug] src/mod_auth_kerb.c(1758): [client 10.105.5.131] ...
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1answer
166 views

Windows client damage authorization header (Kerberos) => IIS 400 (Bad Request)

We are facing strange behavior on about 5% of Windows (7 Pro and XP Pro, both 32 and 64 bits) client computers. These computers gets randomly error from IIS server - 400 Bad request. We are using ...
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1answer
893 views

Changing login-formats for Linux and Active Directory

On CentOS, I run realm list and see login-formats: %U@mydomain.local I'd like to change login-formats: %U@mydomain.local to login-formats: %U How would I go about doing this? I'm assuming there is a ...
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2answers
2k views

Linux AD integration, unable to login when using Windows Server 2012 DC

I am trying to integrate my CentOS 6.6 servers into Active Directory. I've followed this guide from Red Hat using configuration 3 (SSSD/Kerberos/LDAP). When using a Windows Server 2008 R2 server as ...
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367 views

Windows Authentication to a Remote Server within an Intranet Environment

I have several servers (all on the same DC) within an Intranet environment at my company. For simplicity, I'll focus my question on the IIS and SQL Servers. I have an IIS 7.5 web server and a remote ...
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2answers
66 views

Kerberos PuTTY from non-domain machine via VPN

Feels like I'm missing something fundamental here... Have a non-domain machine (personal machine off site) from which I VPN into our work network. Once connected, from 'klist', it appears my VPN ...
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1answer
375 views

Kerberos SSO virtualhost different domain

I have a running centos6.6 server who authenticates against a windows 2008 AD with realm EXAMPLE.LOCAL. I have successfully configured an apache webserver for authentication through kerberos keytab ...
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141 views

Kerberos constrained delegation

There is a small problem with the setting Kerberos constrained delegation in Active Directory. The scheme works as follows: 1. Client workstation. 2. Web server with Windows 2008 Ent installed IIS (...
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1answer
122 views

SCOM: SQL Server cannot authenticate using Kerberos

For past few months, we are getting these kind of alert in SCOM stating SQL Server cannot authenticate using Kerberos. One thing to note here is that this alert is coming from only one server not ...
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1answer
630 views

Samba4 and Kerberos configuration on a dedicated server

I try to set up Samba 4 on a dedicated server from kimsufi.com but I have difficulties configuring Kerberos and Samba4. I am very confused about IP, Realm, Domain, NetBIOS, DNS etc. in Kerberos and ...
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1answer
36 views

unable to change environment variable using setenv()

I have an a member server with a windows PDC with active directory. Security=ads. I am trying to set an environment variable(credential cache) using C: setenv("CCACHE","cache_name",1); However, ...
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4k views

Security-Kerberos Error, event ID 4

I have two new Domain Controllers on new Forest. Servers have DFS and IIS services installed. Everything seemed to go Ok for a While. After updating servers I got new errors. Now once in hour ...
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1answer
349 views

Unable to join AD domain using Kerberos from kickstart

I am trying to join to the Windows domain in the %post chroot section of my kickstart script using kinit and net commands after setting up the samba, kerberos and sssd configurations in %pre. My ...
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2answers
934 views

OpenSSH two factor authentication combined with Kerberos / public key

I'm trying to implement two-factor authentication for OpenSSH. The environment is Centos 7 (kernel: 3.10.0-229.1.2.el7.x86_64) with OpenSSH_6.6.1p1, OpenSSL 1.0.1e-fips 11 Feb 2013. We have Active ...
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2answers
283 views

LDAP syncrepl with kerberos authentication

I'm trying to set up a replication server for LDAP using syncrepl. I would like to use Kerberos to authenticate the consumer, because we have it set up, and it seems more secure. The database ...
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1answer
743 views

Kerberos constrained delegation using Citrix NetScaler

I'm currently evaluating Citrix NetScaler VPX (NS10.5 56.12.nc) as a potential replacement for Microsoft TMG server. Kerberos Constrained Delegation is at the top of my list of mandatory features. ...
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1answer
8k views

Client not found in kerberos database while getting initial

I am installing Squid3 on Ubuntu 14.10 and I want to integrate it ADDS on windows server 2012 using kerberos 5. My infrastructure are as follows: Default Gateway: 192.168.1.1 DNS & Domain ...
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2answers
243 views

Integrate Squid Kerberos auth and Squidguard ldapusersearch into AD

I'm having trouble with Squid Kerberos auth and the Squidguard ldapusersearch that I use to apply ACLs by Active Directory groups membership. The problem is : Squid and Squidguard see my user as : ...
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3k views

Check Primary Authentication Protocol for Active Directory (NTLM or Kerberos?) [duplicate]

How can I check, from a client machine (in Global Group)(also is local admin), whether the domain controller is authenticating my login request to the domain using NTLM or Kerberos? I know that ...
4
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1answer
1k views

Kerberos KDC has no support for encryption type while getting credentials

I am configuring an apache/SSO authentication with an AD with Kerberos. My http server is a Debian Wheezy and the AD is a Windows Server 2012. I generated keytabs files on WS2012 with kpass command ...
0
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1answer
142 views

AWS EC2 Server can not access a fileshare over a VPC VPN using the machine name

I have a windows server on EC2 that is connected to my office via VPN. I'm having an issue connecting to file shares over the VPN. I'm able to connect if I use the IP address for example if I use \...
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1answer
752 views

Troubleshooting kerberos problems with Samba

I've run into an odd problem with Samba 3.6.23. Right now I have a Windows 2008 R2 machine that has trouble accessing shares on a domained Samba box. \\example_serv\my_share : Fails with LOGIN ...
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1answer
245 views

Mongodb + Kerberos BadValue SASL mechanism GSSAPI is not supported

I am trying to run an instance of mongodb with the authentication mechanism GSS-API. This is the command: mongod --dbpath /home/ec2-user/db/node2/data --auth --setParameter authenticationMechanisms=...
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2answers
4k views

March 10th Patch Tuesday appears to cause SQL Server client connection problems

Since applying the full set of patches on a Win 7.1 Pro desktop and a Windows 2012 R2 Datacenter Azure server running SQL 2014, SQL Management Studio (2008 and 2014 versions) won't connect to the SQL ...
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3answers
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SQL Server Windows Authentication fails after tonight's security updates: The login is from an untrusted domain

We have the following setup: One Domain Controller (DC, Server 2003 R2 Standard x64) One SQL Server (SQL, Server 2008 R2 Standard x64) some clients. All machines are in the same domain. All user ...
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0answers
67 views

Obtain krb ticket for another user

I have a system account in my domain (DOM\sys) and it has access to service cifs/server@DOM. I want to obtain a ticket for this service using my own account (DOM\user). In other words I need sudo-like ...
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1answer
512 views

Kerberos keytab permissions

Can you share some thoughts on whether a Kerberos keytab should be readable only by root - under all circumstances? Or are there exceptions to this rule? I am setting up a Squid proxy on Debian ...
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vote
1answer
421 views

Ldap+kerberos authentication through AD

Is it possible to configure ldap+kerberos authentication on a linux machine without joining it to windows domain? I have to create a pool of VMs using RHEVM with a pretty short lifetime and I do not ...
0
votes
1answer
109 views

Slave Kerberos behind NAT - kprop fails: Incorrect net address while decoding database size from client

I want to synchronize MIT Kerberos database from master to slave, which is in a different geographical location. kprop synchronization fails because of a NAT. Is there any solution to have kprop ...
1
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1answer
144 views

Kerberos, Active Directory, and Linux/Unix Servers

I have done some research on the topic, but I can't quite find a straight answer to my question. Please tell me if my understanding is correct. Kerberos can be used as the bridge between a Linux/...
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1answer
971 views

Ubuntu 14.04 Active Directory auth fails after static ip config

I'm having 6 Ubuntu 14.04 servers that are joined to active directory (2003 domain functional level 2008r2 schema) All of the servers work's fine when network interface is configured to use DHCP. But ...
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2answers
515 views

Authentication fails when using ARR to load balance Lync 2013 internal web services

I'm using Application Request Routing 3.0 on Windows Server 2012 R2 to load balance the internal web services on a Lync 2013 front-end pool; I'm not using it to reverse proxy the external web services ...
4
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1answer
56 views

At which point becomes a changed computer group membership active?

When adding a computer object to an AD group, at which point in time does the group membership become active? Is there some kind of kerberos refresh interval (similar to group policy refresh)? I ...
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1answer
63 views

Client not requesting Kerberos authentication

My client is not requesting Kerberos tickets, but does when using fiddler. I was then advised not to use fiddler and use Wireshark, using this I can see that the client is sending an NTLM ...
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128 views

Establish FAST encrypted channel between linux client and windows server

I am trying to setup windows server for FAST encrypted channel support to test OTP pre authentication in kerberos. I have already tested on linux machine by deploying KDC using krb5-1.12.1 source ...
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3answers
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Alternatives to Kerberos for passwordless server access

I have a bunch of Linux servers and three Windows servers 2008 R2. I would need a solution which would enable passwordless SSH login from each of those servers to all others. I could do this by ...
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2answers
605 views

kadmin cannot list principals “requires list privileges”

I can authenticate fine via kadmin however cannot list principals? [root@server ~]# kadmin -p admin Authenticating as principal admin with password. Password for admin@org.domain.com: kadmin: ...
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1answer
810 views

Why is sshd engaging PAM still?

Background/Behavior is: if you ssh to box via and GSSAPI/Kerberos succeeds and you have a local user in /etc/passwd, you login fine per below PAM config. All Good there. But if you don't have a ...
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1answer
287 views

Setting up Secure Hadoop Cluster - Kerberos security

I setup a HDP 2.2 cluster successfully (1 NM, 3 DNs and 1 client). User accounts to access HDP cluster are created in client and checked these users can submit jobs, by SSH to client node and run ...
0
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1answer
5k views

[root@pcm-ipa-01 tmp]# klist klist: No credentials cache found (ticket cache FILE:/tmp/krb5cc_0)freeipa kadmin admin principal not found

I have installed freeipa on centos and after restarting the service seems to have lost authentication for "kadmin" [root@pcm-ipa-01 ~]# kadmin init Authenticating as principal root/admin@MY.DOMAIN T ...