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Old 08-20-2012, 03:26 AM   #1
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Apache SSO in multi domain Windows environment


I have a RedHat 5.7 server with Apache 2.2.3 configured to automatically authenticate users when they reach a website. The SSO is working for only one domain, but users can log in with others domains accounts without SSO.

Every domain has a trust with others. I thought this would be enough for authentication to work with multiple domains.

Is it possible to make SSO work in a multiple domains environment ?

Here is an extract of my /etc/krb5.conf

default = FILE:/var/log/krb5libs.log
kdc = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log

default_realm = DOMAIN1.COM
default_keytab_name = /var/sites/conf_apache/extranet.V1.keytab HTTP/
dns_lookup_realm = false
dns_lookup_kdc = false
ticket_lifetime = 24h
renew_lifetime = 7d
forwardable = true
default_tkt_enctypes = arcfour-hmac-md5
default_tgs_enctypes = arcfour-hmac-md5
allow_weak_crypto = true

kdc = DC1.DOMAIN1.COM:88
admin_server = DOMAIN1.COM:749
default_domain = DOMAIN1.COM
kdc = DC1.DOMAIN2.COM:88
admin_server = DOMAIN2.COM:749
default_domain = DOMAIN2.COM
kdc = DC1.DOMAIN3.COM:88
admin_server = DOMAIN3.COM:749
default_domain = DOMAIN3.COM


pam = {
debug = false
ticket_lifetime = 36000
renew_lifetime = 36000
forwardable = true
krb4_convert = false

The Kerberos part of my Virtualhost:

<Location />
AuthName "Extranet"

KrbMethodNegotiate On
KrbAuthoritative On
KrbMethodK5Passwd On
AuthType Kerberos
require valid-user
KrbServiceName HTTP/
Krb5KeyTab /var/sites/conf_apache/extranet.V1.keytab
Do I have to generate a per domain keytab and put it in the Vhost ? Actually it was generated from DOMAIN1.COM.

Thank you.
Old 08-20-2012, 07:17 PM   #2
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I believe what you need is transitive trust relationships which is not currently possible with AD - I've been waiting for IPA v3 which has just come out (beta), if you take a look at the new IPA architecture you'll see how many components it takes to make it possible.

Maybe you should run a POC in the lab, that's what I'll be doing.
Old 08-21-2012, 01:46 AM   #3
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Registered: May 2012
Posts: 11

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thank you for your answer. If this is the only solution, I will let it go. I was looking for an error in my configuration. The SSO on multi domains is more a best effort for our users than a real need.

Thank you again, I will keep an eye on IPA v3.


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