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IDS Forum

Informix Single Sign-On with Active Directory Kerb

Posted By: Nate Woodward
Date: Monday, 13 September 2010, at 6:04 p.m.

I'm trying to get SSO to work between IDS and AD. My environment is:

IDS host machine: CentOS 5 VM running within XenServer
AD host machine: Windows Server 2008 running within HyperV
IDS version: 11.50.FC5

I'm handling the informix/linux end of things, and am working with someone who is in charge of the AD/windows portion (so I might screw up some of the AD terminology). We've set up everything using the instructions from the pdf at http://www-01.ibm.com/support/docview.wss?rs=0&uid=swg21405613 , although we're a bit unclear as to what the SPN should be. Presently, we've set it with the following syntax

setspn -a INFORMIXSERVER/ids.host.machine.com domain\informix

Here, INFORMIXSERVER is the same as the $INFORMIXSERVER variable on the IDS machine, ids.host.machine.com is its fqdn, "domain" is the AD domain, and "informix" is the informix user.

When we export the keytab, merge it with /etc/krb5.keytab on the IDS machine, and configure the informix engine with SSO using the appropriate options in sqlhosts, we get this error:

$ echo select \* from tablename | dbaccess dbname
5000: CSM error: gss_init_sec_context: Unspecified GSS error. Minor code may provide

Logging in as informix works correctly. I currently have an informix user and group defined in /etc/passwd and /etc/group, but do not have an encrypted password stored for it in /etc/shadow (so that it authenticates using active directory). After logging in, the output of klist shows the SPN ticket.

Any ideas where things might be going wrong?
Are there kerberos log files I can check to get more specific info as to why authentication is failing?
Is what we're trying to do even possible? The release notes at http://publib.boulder.ibm.com/infocenter/idshelp/v115/index.jsp?topic=/com.ibm.relnotes.doc/ifx_1150xc7/ids_defects_11.50.html indicate:

Security
<snip>

IC68364 SSO AUTHENTICATION FAILURE IN

GSS_INIT_SEC_CONTEXT OR GSS_ACQUIRE_CRED ON HP,

AGAINST ACTIVE DIRECTORY KERBEROS SERVER

Does this apply to my version/platform (11.50.FC5 on CentOS 5, as opposed to 11.50.xC7 on HP-UX)?

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