SSO using Kerberso receiving "Integrity check on decrypted field failed (31

Question

I am trying to implement SSO for an application that is running on a WebLogic Server. I have flagged the AD Service user for DES encryption, added spn through setspn, created the keytab file, reset the password (to the same value), moved the keytab file, updated krb5.ini and krb5Login.conf accordingly, modified WebLogic startup command accordingly. When Users try to access the application, authentication fails, and I see “Integrity check on decrypted field failed (31)” error in the WebLogic logs. Any ideas ? I am attaching the related lines from the log below.
<Sep 29, 2008 9:46:50 AM MDT> <Debug> <SecurityDebug> <000000> <Found Negotiate with SPNEGO token>
Debug is true storeKey true useTicketCache false useKeyTab true doNotPrompt false ticketCache is null KeyTab is devmax01.http.keytab2 refreshKrb5Config is false principal is HTTP/[email protected] tryFirstPass is false useFirstPass is false storePass is false clearPass is false
KeyTab: load() entry length: 60
KeyTabInputStream, readName(): DEV.DENVERWATER.ORG
KeyTabInputStream, readName(): HTTP
KeyTabInputStream, readName(): devmax01principal's key obtained from the keytab
principal is HTTP/[email protected]
EType: sun.security.krb5.internal.crypto.DesCbcMd5EType
KrbAsReq calling createMessage
KrbAsReq in createMessage
KrbAsReq etypes are: 3 1
KrbKdcReq send: kdc=dwdev01 UDP:88, timeout=30000, number of retries =3, #bytes=249
KDCCommunication: kdc=dwdev01 UDP:88, timeout=30000,Attempt =1, #bytes=249
KrbKdcReq send: #bytes read=1312
KrbKdcReq send: #bytes read=1312
EType: sun.security.krb5.internal.crypto.DesCbcMd5EType
KrbAsRep cons in KrbAsReq.getReply HTTP/devmax01Added server's keyKerberos Principal HTTP/[email protected] Version 8key EncryptionKey: keyType=3 keyBytes (hex dump)=
0000: 2F 02 76 AB 7F 8C B0 6E
[Krb5LoginModule] added Krb5Principal HTTP/[email protected] to Subject
Commit Succeeded
Found key for HTTP/[email protected]
Entered Krb5Context.acceptSecContext with state=STATE_NEW
EType: sun.security.krb5.internal.crypto.DesCbcMd5EType<Sep 29, 2008 9:46:50 AM MDT> <Debug> <SecurityDebug> <000000> <GSS exception GSSException: Failure unspecified at GSS-API level (Mechanism level: Integrity check on decrypted field failed (31))
GSSException: Failure unspecified at GSS-API level (Mechanism level: Integrity check on decrypted field failed (31))

Answer 1

FYI The fix for this was to chang the value for -Djava.security.krb5.realm to be all upper case
Once that change was made authentication passed
Edited by: IDL on Jan 2, 2008 9:25 AM