Setup
To use SSO with Spark (as of subversion r8551), a few things need to be configured.
At the login screen, click on ‘Advanced’ and go to the SSO tab.
Click on ‘Use Single Sign-On via GSSAP’. If Spark reports what username it will use, this may be all you need to do.
If Spark was not able to determine a username to use, click on Ok
and exit Spark. You will need to edit the spark.properties file.
There are 4 “hidden” properties you can add/edit in this file:
ssoMethod=string ssoRealm=string ssoKDC=string ssoAdv=boolean
ssoMethod
Set ssoMethod to one of file, dns or manual. If not specified, the
default is OS dependent. (On Windows its dns, on others its file)
Set to file to use a krb5.conf or krb5.ini (OS dependent) to
determine the realm and KDC information. file is recommended for Unix
installations or when a complex realm setup is needed, and DNS is not
configured.
Set to dns to use DNS SRV records to determine the KDC information
and TXT records to determine the realm. DNS is recommended for ease of
administration, but requires additional setup from the default Windows
AD DNS records.
Set to manual to use the ssoRealm and ssoKDC fields.
ssoRealm
Set this to the name of the realm to use when ssoMethod is manual.
ssoKDC
Set this to the KDC to use when ssoMethod is manual.
ssoAdv
Set this to true to allow setting the above options on the SSO tab of the advanced settings in the GUI. The default is false.
krb5.conf / krb5.ini
If you wish to use a krb5.conf or krb5.ini file, you can use the following example:
[libdefaults] default_realm = EXAMPLE.COM [realms] EXAMPLE.COM { kdc = kdc.example.com kdc = backupkdc.example.com admin_server = kdc.example.com default_domain = example.com } [domain_realms] example.com = EXAMPLE.COM .example.com = EXAMPLE.COM
This file should be placed in either /etc/krb5.conf or
C:\Windows\krb5.ini or in your OS specific location. For more details
on this file syntax, see 
[http://www.cmf.nrl.navy.mil/CCS/people/kenh/kerberos-faq.html#confdoc]
DNS Records
To use DNS records, the following must be set up in your DNS zone:
SRV record
kerberos.udp.example.com Should be a valid SRV record and point to the KDC for your realm.
TXT record
_kerberos.example.com Should be a valid TXT record and contain the name of your Kerberos realm.
Example:
_kerberos._udp.example.com 7200 IN SRV 0 0 88 kdc.example.com. _kerberos._udp.example.com 7200 IN SRV 1 0 88 backupkdc.example.com. _kerberos.example.com
Registry
You need to modify the registry to allow exporting the TGT for SSO
to work. Modifying your registry is dangerous- make sure you have
proper backups before making any changes to your registry.
Depending on the OS, the setting is in a different location:
For Windows 2003 and Windows 2000 SP4:
HKEY_LOCAL_MACHINESystemCurrentControlSetControlLsaKerberosParameters Value Name: allowtgtsessionkey Value Type: REG_DWORD Value: 0x01 ( default is 0 )
Here is the location of the registry setting on Windows XP SP2:
HKEY_LOCAL_MACHINESystemCurrentControlSetControlLsaKerberos Value Name: allowtgtsessionkey Value Type: REG_DWORD Value: 0x01
AllowTGTSessionKeyXP.ADM (281 Bytes)
AllowTGTSessionKey2k3Vista.ADM (299 Bytes)