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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103 views

Is LDAP used by Active Directory for anything if I only use Kerberos for authentication?

In my windows only domain, Kerberos is used for all authentication. The domain controllers I understand replicate & authenticate using RPC. Is LDAP used for anything else? Should I close the ...
6
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1answer
146 views

Is it possible to use Kerberos over TLS through sssd?

Background I am trying to log in (via SSH, to an Amazon Linux EC2 instance running sssd) as users that I've created in my AWS Directory Services Simple AD. I am authenticating with Kerberos and ...
4
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2answers
166 views

AWS Simple AD: “KDC has no support for encryption type” for users created with adtool, but not with MS Management Console

Background I am trying to log in (via SSH, to an Amazon Linux EC2 instance running sssd) as users that I've created in my AWS Directory Services Simple AD. I am authenticating with kerberos and ...
2
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2answers
419 views

How to add principals to a keytab when using realmd on CentOS

I joined a server to a MS Active Directory using realmd/sssd. I installed apache with mod_auth_kerb and created a keytab on a windows server. But, I need to add more SPNs to the keytab. I have tried ...
2
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1answer
72 views

SSH, Kerberos, AD: how / where to config /etc/pam.d/password-auth?

I have a CentOS 6 machine here and want to give SSH access for users from another forest, which is trusted. I got a temporary workaround, which is: 1) change content in /etc/pam.d/vncserver to auth ...
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40 views

Kerberos encryption unsupported type 23

I have to set up a automated file transfer from an application server to Hadoop fs using curl and Kerberos, I created the Kerberos keytab in the server hosting Hadoop successfully and the encryption ...
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0answers
40 views

Alot of Events “Kerberos authentication Ticket (TGT) was rejected”

Currently we are seeing a lot of Events "Kerberos authentication Ticket (TGT) was rejected" even for the accounts that are blocked. Also from the event logs, I see a username being used which does ...
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2answers
256 views

login with active directory users on debian jessy not working

I'm trying to get the login with active directory users working for nearly a week now. First of all, I'm pretty new to pam, samba, kerberos and winbind. We worked with local users and sudo before, but ...
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1answer
34 views

Grant Kerberos Ticket on successfull authentication against third party password store

I am currently building a system where I would like to deploy Kerberos. However my external constraints on the user management do not allow me to authenticate the users against Kerberos itself. I do ...
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1answer
151 views

Automatic Kerberos Ticket Renewal (Indefinitely)

I am currently switching our environment from NIS over to Kerberos + LDAP. During this migration I've now run into the following situation. We mount our homes via NFS which obviously should also be ...
0
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1answer
93 views

psql: duplicate GSS authentication request

What does it mean by saying 'duplicate' ? How to troubleshoot this? guest@www:~$ klist Ticket cache: FILE:/tmp/krb5cc_1000 Default principal: user/admin@SOHONET Valid starting Expires ...
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2answers
63 views

Issue authenticating to AD-joined Centos 7 server

Using this link, I have set up a server that is properly joined to an Active Directory server, but for some reason I can not authenticate to that server with a kerberos ticket on several test-users ...
0
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1answer
124 views

Single Sign On with multiple Identity Providers from PHP web app

I'm building a SAAS web app in PHP that needs to integrate SSO. We'll have multiple client organizations, each that have their own Identity Provider (Active Directory). While researching ...
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0answers
86 views

Websphere Application Server and Kerberos Keytab Renewal

I am currently running into an issue with Kerberos ticket expiration from a keytab on WAS 8.5.5.5. The same process works correctly on Tomcat 8, and I believe the primary difference is the JDK / JAAS ...
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2answers
485 views

kinit succeeded but ads_sasl_spnego_krb5_bind failed: SASL bind in progress

I'm trying to use fedora and samba as a file server. Using kerberos i'm trying to make sure no passwords are transmitted over my network. I'm able to use samba for its file server capabilities, ...
3
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3answers
117 views

Kerberos with OpenLDAP backend: Password Sync HowTo

The basic setup is an OpenLDAP server. The users are provisioned and the passwords are set. Now we decided to add an MIT KDC for being able to use Kerberos. We configured the MIT KDC to utilize the ...
3
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1answer
63 views

Kerberos authentication fails when local password is expired

I am using pam_krb5 with local accounts (Linux) for AD password authentication. Things are working great, users are able to authenticate with both AD and local passwords. I am having a problem ...
0
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1answer
40 views

Cache FreeIPA passwords to /etc/passwd

I have setup freeIPA/Kerberos authentication for my domain and it works well. I have a service that does not support server-based auth, only local auth via /etc/passwd. Is there a method to cache ...
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0answers
25 views

Kerberos - KDC and IIS on same machine

I have one domain controller which must act as Kerberos KDC and a IIS server running on that same domain controller. I need to set up an Integrated Windows Authentication where a domain user can ...
1
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3answers
790 views

Unable to join domain using samba tool net or realm/sssd

On a rhel7 server I am trying to join the server to a domain, but I am getting the following failure: net ads join -S domain.example.org -U name Enter name's password: Failed to join domain: failed ...
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0answers
23 views

Standalone VM on CentOS KDC Kerberos 5 Server autentication error

After installed and configured the kerberos 5 server on a CentOS 6.7 virtual machine. I tried to authenticate my principal admin and got this error below, I don't understand why the error as it looks ...
0
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1answer
133 views

Switch to Kerberos Authentication with Apache2 on Ubuntu (LDAP or AD)

I'm considering to switch my intranet apps to Kerberos authentication.(currently NTLM but modules required are not maintained anymore and will in not work anymore once the web server is updated to ...
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3answers
70 views

Squid kerberos authentication no popup

I configured squid to use kerberos authentication but when I'm trying to use proxy with browser i don't get popup in browser with ask for user and password - just access denied cos of no ...
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0answers
32 views

Apache Kerberos auth prompts user for password

I am trying to setup single-sign on against our Active Directory server for my Apache using the mod_auth_kerb module. I have the following configuration in Apache: AuthType Kerberos AuthName ...
0
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1answer
42 views

Windows AD single DC (degraded) - cannot modify Administrator limit exceeded

I had 2 DC's in my domain. one of them died, and the last one has all roles, dcdiag netdiag show all checked as "good" - but i actually can't modify my "Administrator" account. according to alot, ...
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1answer
66 views

Login in Active Directory Domain (Samba 4) and mount -t cifs on debian

I've configured Samba 4 with bind and kerberos to work as an Active Directory authentication server. I've also configured "home share" so I can login to any Windows machine in my Domain and work with ...
4
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0answers
37 views

Why is it common in the startup world for ssh keys to be used for authetication instead of kerberos? [closed]

My first few jobs as a linux admin had be working under some very senior admins. In all of these cases kerberos was setup for users to request a security token and gain access to company servers for ...
0
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1answer
27 views

Server 2008 R2 Replication Issue

I am trying to figure out why my Server 2 which is a domain controller is getting an error saying "Access Denied" when I am trying to access group policy management. I have checked and it is giving ...
1
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1answer
278 views

Error: KDC has no support for encryption type

I have intermittent authentication issues on my ubuntu 15.04 servers. Periodically, authentication will just stop working. Eventually it will start working again on its own. Or, if I restart both smbd ...
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0answers
156 views

Tomcat 8, Kerberos authentication

I'm configuring kerberos for a tomcat server. Before I call the web application support company I would like to know if I'm doing the correct steps since it's my first time. The domain has 2 zones, ...
2
votes
2answers
270 views

MaxTokenSize on Server 2012 R2 and Groups

I fixed an issue yesterday where a 2008 R2 machine did not want to communicate with the DC. I discovered warnings in the event log relating to the kerberos buffer, so I increased the size in the ...
0
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1answer
90 views

Cannot authenticate with Kerberos if both client and server on the same machine

I have a Tomcat webapp that supports Kerberos authentication. It works fine and I can log in to that app if I use a built-in account like LOCAL SYSTEM or NETWORK SERVICE, but I'm having problems with ...
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votes
1answer
123 views

How can I join a Windows Server 2008R2 server to a FreeIPA domain (LDAP/Kerberos)

In an infrastructure which consists of over 100 linux machines and only a single Windows Server (which will be replaced in two years with a linux server), it makes no sense to configure cross-forest ...
0
votes
1answer
315 views

HBase Kerberos SaslException: GSS initiate failed (Mechanism level: Failed to find any Kerberos tgt)

I am trying to set up Kerberos authentication for HBase using this http://hbase.apache.org/0.94/book/security.html documentation and have very little progress so far. HBase 1.1.1 from Apache without ...
3
votes
1answer
138 views

Proxy Kerberos Authentication - Kerberos Service Ticket Issues

I have a BlueCoat ProxySG that is able to authenticate users via Kerberos. It is set to "Proxy" so it requires user authentication for each new TCP connection. Users have a Single Sign On and their ...
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0answers
39 views

Dante with Kerberos configuration across sites

I have a requirement to host a socks proxy in a central location, using Dante. What I've been asked to do is connect remote clients to it across the internet, they'll pass through a gateway routing ...
0
votes
1answer
21 views

krb5 / ldap: realm name match with directory namingContext

In order to store krb5 principal entries on LDAP, is the LDAP naming context (root basename) required to match the realm name? principals of the realm HQ.EXAMPLE.ORG can be stored in the ...
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votes
1answer
193 views

Authenticate Samba share via Kerberos using Open Directory

I have an Open Directory master on a machine called "minime" (El Capitan, Server 5). I further have a Samba server "tricky", running Ubuntu and a Mac OS X client "wallace". I want users on wallace to ...
1
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1answer
193 views

MIT Kerberos with OpenLDAP backend - TLS ok when KDC started interactively but init script fails

In DNS domain domain.local. there are two machines host.domain.local. = 192.168.1.1 srv1.domain.local. = 192.168.1.2 host.domain.local. is KDC for Kerberos realm DOMAIN.LOCAL, srv1.domain.local. ...
0
votes
1answer
4k views

Samba4 & Active Directory Kerberos [Cannot contact any KDC for realm 'INTERNAL.CORP.COM' while getting initial credentials

Yesterday I configured an Active Directory Server using Arch Linux and Samba 4 following this guide. I even added a client to the domain and was able to log in successfuly on my client. After a ...
1
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1answer
51 views

GSSAPI on Linux when reverse DNS lookup doesn't match AD DNS suffix

I have CentOS 6 server that has been joined to Active Directory using Samba and net ads join -k. It thus has a keytab like this: Keytab name: FILE:/etc/krb5.keytab KVNO Principal ---- ...
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0answers
215 views

Is it ok to disable the KCM (Kerberos Credential Cache) daemon on OS X?

I've got some issues that seems would be cleared up if I disable the KCM Daemon (it's the Kerberos Credential Cache). Is there any good reason I shouldn't? Does it break anything other than single ...
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0answers
59 views

How to get Kerberos tickets in sync with OS X password changes?

I've traced an issue that's been plaguing us down to a "simple" problem: Kerberos tickets are not syncing with OS X Open Directory password changes. Another way to put this: Expired/expiring ticket ...
1
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1answer
30 views

How does data flow in a password change with Open Directory?

I'm trying to troubleshoot an OS X OD issue and I'm having a hard time finding anything concrete about just how data flows between clients and server. Specifically, I'd love to know what exactly ...
2
votes
1answer
45 views

Kerberos Error APP_MODIFIED when using a CNAME DNS record

I have a production server, which I'll call CONTOSO\MachineA, running SQL Server. I have a development server, which I'll call CONTOSO\MachineB, running IIS. Both servers are running Windows Server ...
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0answers
83 views

How can I make Kerberos flush the credential cache when a user changes their password?

We've got a fun new issue after upgrading to OS X 10.10 client and server with Open Directory (from 10.8). When a user changes their password (using System Preferences or at the Login screen) it ...
0
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1answer
354 views

Slaptest, bad configuration file

I have been struggling to start LDAP server and I am failing miserably at it, from journalctl -xn I it clearly say bad configuration files!, but there are three configuration files, but what is ...
0
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1answer
337 views

Can I use kadmin (Linux) to add/remote SPNs from an Active Directory server?

Is it possible to use kadmin (Linux) to add/remote SPNs from an Active Directory server? I'm trying to add some service principles on my Active Directory server and store the keys in the local keytab ...
1
vote
1answer
431 views

Enabling AES-encrypted single sign-on to Apache in a Win2008 domain

All of the tutorials I could find on setting up single-sign on into an Apache-hosted website using Active Directory authentication do so by configuring Kerberos with insecure settings. It's been best ...
0
votes
1answer
100 views

LDAP+KERBEROS server configuration

I am following this guide to setup up kerberos server. the system configuration for kerberos server is below, can someone help me to resolve the issue, any help will be appreciated. Here is the ...