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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Why use Kerberos instead of NTLM in IIS?

This is something that I've never really been able to answer as well as I like: What is the real advantage of using Kerberos authentication in IIS instead of NTLM? I've seen a lot of people really ...
1
vote
1answer
816 views

nagios - Web interface: authentication through kerberos OK, what about authorization on cgi.cfg?

I have successfully installed nagios, and it provides authentication through apache2 which contacts a kerberos authentication server to authenticate users. Now, users are authenticated, but they ...
14
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3answers
33k views

Getting Squid to authenticate with kerberos and Windows 2008/2003/7/XP

This is something I setup recently and was quite a big pain. My environment was getting squid to authenticate a Windows 7 client against a Windows 2008 Server invisibly. NTLM is not really an ...
4
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4answers
13k views

How can I check if my IIS site is using NTLM or Kerberos?

How can I check if my IIS site is using NTLM or Kerberos? And how can I change authentication from Kerberos to NTLM? I'm using IIS 7.5 and I couldn't find any answer to this question, can help me a ...
6
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3answers
6k views

Apache mod_auth_kerb and LDAP user groups

I've been considering deploying mod_auth_kerb on our internal web servers to enable SSO. The one obvious problem I can see is that it's an all-or-nothing approach, either all your domain users can ...
0
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1answer
1k views

Is it possible to switch to Kerberos only Windows domain

Is it possible to configure both Windows servers and workstations (Windows 7) to use only Kerberos for authentication and not use NTLM for authentication within the Domain? I was told that Kerberos ...
19
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1answer
4k views

Authenticating OpenBSD against Active Directory

Edit: Reformatted this as Q&A. If anyone can change this from Community Wiki to a typical question, that's probably more appropriate as well. How can I authenticate OpenBSD against Active ...
7
votes
1answer
2k views

Best practice for authenticating DMZ against AD in LAN

We have few customer facing servers in DMZ that also have user accounts , all accounts are in shadow password file. I am trying to consolidate user logons and thinking about letting LAN users to ...
11
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2answers
2k views

The Story of secure user-authentication in squid

once upon a time, there was a beautiful warm virtual-jungle in south america, and a squid server lived there. here is an perceptual image of the network: <the Internet> ...
8
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4answers
4k views

Linux Central Authentication/Authorization Methods

I have a small but growing network of Linux servers. Ideally I'd like a central place to control User Access, change passwords, etc... I've read a lot about LDAP servers, but I'm still confused about ...
3
votes
1answer
2k views

Single Sign On for intranet with Apache and Linux MIT Kerberos

EDIT: SOLVED! See my answer below. Greetings, I am looking for a way to do a single sign on to an intranet in the following manner: A Linux user logs on via a graphical frontend (for example, ...
1
vote
2answers
1k views

Kerberos authentication in IIS with .NET app under domain identity not working

Having a hell of a time trying to get a .NET web app to use Kerberos auth successfully, and would appreciate some assistance from the SF community. Currently there is a Win2003/IIS6 server hosting a ...
8
votes
1answer
1k views

IPA vs just LDAP for Linux boxes - looking for a comparison

There are few (~30) Linux (RHEL) boxes and I'm looking for centralized and easy managed solution, mostly for control user accounts. I'm familiar with LDAP, and I deployed a pilot of IPA ver2 from Red ...
4
votes
1answer
8k views

Creating keytabs and service principal names

I'm trying to set up a keytab for a Java server to support Kerberos authentication on a Windows network. I'm struggling to get it working even at the level of the command line tools, haven't even got ...
3
votes
3answers
2k views

Risks involved in setting up Kerberos authentication for WSS Reporting Services

We have an established Intranet based on WSS with two front ends and a database. Currently all authentication is NTLM. We have installed Reporting Services In Integration Mode. RS works as long as ...
2
votes
3answers
12k views

Kinit Won't Connect to a Domain Server : Realm not local to KDC while getting initial credentials

I am setting up a testbed environment where Linux (Ubuntu 10.04) clients will authenticate to a Windows Server 2008 R2 Domain Server. I am following the official Ubuntu guide to set up a Kerberos ...
2
votes
2answers
1k views

Apache mod_auth_kerb asking 2 authentication

I've configured Apache to use mod_auth_kerberos. So far everything is working nicely for client thats connected to Active Directory and have their browser to ntlm enabled. When clients are not in the ...
8
votes
1answer
2k views

How to tell mod_auth_kerb to do its job despite no “require valid-user”

I implemented a SSO authentication using mod_auth_kerb on Apache. My config looks like this: <Location /login/ > AuthType Kerberos AuthName "Kerberos Login" KrbMethodNegotiate on ...
4
votes
3answers
417 views

Linux on Windows AD Domain

Successfully joined my Linux Box to a Windows AD Domain. Wanted to know from other admins if it us possible to specify what groups from windows ad is allowed to login? Otherwise anyone with a AD ...
1
vote
2answers
4k views

Wrong principal in request (SSH/ GSSAPI/Kerberos/Debian)

I've set up two VMs on an "internal" (in VirtualBox meaning) network, one being a DNS server (dns1.example.com) and the other - a KDC and Kerberos admin server (kdc.example.com). The default and the ...
4
votes
4answers
4k views

Authenticating Windows 7 against MIT Kerberos 5

I've been wracking my brains trying to get Windows 7 authenticating against a MIT Kerberos 5 Realm (which is running on an Arch Linux server). I've done the following on the server (aka dc1): ...
3
votes
1answer
4k views

Impact of increasing the MaxTokenSize for Kerberos Tickets

Recently by migrating form Netware to Windows file servers we have ended up creating a boat load of AD groups. We have now run in to some problems with authenticating and gaining access to resources. ...
3
votes
2answers
3k views

How do I configure an ldap server on ubuntu 11.04 ? (for use with subversion and trac)

I have an Ubuntu server 11.04 on ec2 (I'm mentioning this, as it appears things have changed in this version from previous ubuntu releases, when it regards LDAP configuration). I want to configure it ...
2
votes
1answer
46 views

Kerberos token size error

I am having issues with a .net 2.0 web app hosted on a windows 2003 server authenticating with a java app (on linux I think). The java server is expecting Kerberos authentication and currently fails ...
2
votes
2answers
2k views

Kerberos authentication through load balancer

I generally understand the problems that a load balancer poses for Kerberos. In fact, Microsoft's KB article outright states that it's not possible. However, this article - also on an MS site - ...
2
votes
1answer
699 views

Strong Cryptography in Solaris Zone

I'm trying to setup a Kerberos KDC on a Solaris zone but ran into a bit of a problem with the Cryptographic Framework on Solaris 10 even though the packages for strong encryption (SUNWcry & ...
2
votes
1answer
1k views

Moving my website to different server changes authentication from Kerberos to NTLM

I have a webservice that is configured for Windows Authentication. The client code that invokes the WS passes along the credentials to the WS as follows: myWebService.Credentials = ...
1
vote
1answer
158 views

How exactly does the HOST/machine SPN work?

Normally when you set up Kerberos for IIS, you would do something like setspn -A HTTP/machine some_account. When IIS 7 is installed, it registers the SPN "HOST/machine" for its kernel-mode ...
1
vote
0answers
645 views

Server not found in Kerberos database while getting credentials for imap

When running kvno imap/prueba-mail.ejemplo.org@EJEMPLO.ORG get the following error: kvno: Server not found in Kerberos database while getting credentials for imap/prueba-mail.ejemplo.org@EJEMPLO.ORG ...
1
vote
2answers
3k views

2008 DC GPO - “Advanced Audit Policy Configuration” missing?

I'm trying to enable Kerberos Authentication auditing in a GPO for the purpose of sending auth events to an AD-integrated web filter appliance, and the instructions have me enable auditing of the ...
1
vote
1answer
156 views

OpenSSH + Kerberos SSO: No key table entry found for host/localhost.localdomain

SSO not working with OpenSSH - I have not been able to get GSSAPIAuthentication to work with Kerberos. Everytime I attempted to login, I kept getting prompted for the password. During the ...
1
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2answers
327 views

Can anyone recommend a book on Kerberos that mentions AD 2008?

I've got a nice O'Reilly book on Kerberos from our library, but it was last updated in 2003. I'm pretty sure there have been changes and improvements since then, especially with AD 2008. Are there ...
1
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3answers
1k views

Disabling Windows password changes on Samba domain

When a user on one of our Windows clients hits ctrl-alt-delete to change his password, our Samba domain controller is notified and performs the password change. Unfortunately, the group policy rule ...
0
votes
1answer
581 views

Kerberos pre-authentication failed on nfs mount

I have the following nfs export: /home/users 192.168.1.0/24(rw,sec=krb5p,no_subtree_check,nohide,async,anonuid=65534,anongid=65534) When trying to mount that on a client I get: client:/home # ...
0
votes
1answer
2k views

Kerberos Authentication for Webservers

Before I blindly jump on "trial an error" tests, I'd like to ask some general questions on Kerberos Authentication for Webservers. I want to evaluate what's possible with Kerberos. The main benefit ...