Verified.

Version ::

samba4-4.0.0-44.el6.rc4.x86_64

Manual Test Results ::

[root@rhel6-1 ~]# grep KRB5CCNAME /etc/init.d/*
/etc/init.d/smb:KRB5CCNAME=/var/run/samba/krb5cc_samba
/etc/init.d/smb:export KRB5CCNAME
/etc/init.d/winbind:KRB5CCNAME=/var/run/samba/krb5cc_samba
/etc/init.d/winbind:export KRB5CCNAME

[root@rhel6-1 ~]# ipa-adtrust-install

The log file for this installation can be found in /var/log/ipaserver-install.log
==============================================================================
This program will setup components needed to establish trust to AD domains for
the FreeIPA Server.

This includes:
  * Configure Samba
  * Add trust related objects to FreeIPA LDAP server

To accept the default shown in brackets, press the Enter key.

IPA generated smb.conf detected.
Overwrite smb.conf? [no]: yes

The following operations may take some minutes to complete.
Please wait until the prompt is returned.

Enter the NetBIOS name for the IPA domain.
Only up to 15 uppercase ASCII letters and digits are allowed.
Example: EXAMPLE.


NetBIOS domain name [TESTRELM]: 

Configuring cross-realm trusts for IPA server requires password for user 'admin'.
This user is a regular system account used for IPA server administration.

admin password: 

Configuring CIFS
  [1/18]: stopping smbd
  [2/18]: creating samba domain object
  [3/18]: creating samba config registry
  [4/18]: writing samba config file
  [5/18]: adding cifs Kerberos principal
  [6/18]: adding cifs principal to S4U2Proxy targets
cifs principal already targeted, nothing to do.
  [7/18]: adding admin(group) SIDs
Admin SID already set, nothing to do
Admin group SID already set, nothing to do
  [8/18]: adding RID bases
RID bases already set, nothing to do
  [9/18]: updating Kerberos config
'dns_lookup_kdc' already set to 'true', nothing to do.
  [10/18]: activating CLDAP plugin
CLDAP plugin already configured, nothing to do
  [11/18]: activating sidgen plugin and task
Sidgen plugin already configured, nothing to do
Sidgen task plugin already configured, nothing to do
  [12/18]: activating extdom plugin
Extdom plugin already configured, nothing to do
  [13/18]: configuring smbd to start on boot
  [14/18]: adding special DNS service records
  [15/18]: restarting Directory Server to take MS PAC and LDAP plugins changes into account
  [16/18]: adding fallback group
Fallback group already set, nothing to do
  [17/18]: setting SELinux booleans
  [18/18]: starting CIFS services
Done configuring CIFS.

=============================================================================
Setup complete

You must make sure these network ports are open:
	TCP Ports:
	  * 138: netbios-dgm
	  * 139: netbios-ssn
	  * 445: microsoft-ds
	UDP Ports:
	  * 138: netbios-dgm
	  * 139: netbios-ssn
	  * 389: (C)LDAP
	  * 445: microsoft-ds

Additionally you have to make sure the FreeIPA LDAP server is not reachable
by any domain controller in the Active Directory domain by closing down
the following ports for these servers:
	TCP Ports:
	  * 389, 636: LDAP/LDAPS

You may want to choose to REJECT the network packets instead of DROPing
them to avoid timeouts on the AD domain controllers.

=============================================================================

[root@rhel6-1 ~]# kinit admin
Password for admin: 

[root@rhel6-1 ~]# klist
Ticket cache: FILE:/tmp/krb5cc_0
Default principal: admin

Valid starting     Expires            Service principal
11/08/12 12:33:27  11/09/12 12:33:25  krbtgt/TESTRELM.COM

[root@rhel6-1 ~]# ipactl restart
Restarting Directory Service
Shutting down dirsrv: 
    PKI-IPA...                                             [  OK  ]
    TESTRELM-COM...                                        [  OK  ]
Starting dirsrv: 
    PKI-IPA...                                             [  OK  ]
    TESTRELM-COM...                                        [  OK  ]
Restarting krb5kdc Service
Stopping Kerberos 5 KDC:                                   [  OK  ]
Starting Kerberos 5 KDC:                                   [  OK  ]
Restarting kadmin Service
Stopping Kerberos 5 Admin Server:                          [  OK  ]
Starting Kerberos 5 Admin Server:                          [  OK  ]
Restarting named Service
Stopping named: .                                          [  OK  ]
Starting named:                                            [  OK  ]
Restarting ipa_memcached Service
Stopping ipa_memcached:                                    [  OK  ]
Starting ipa_memcached:                                    [  OK  ]
Restarting httpd Service
Stopping httpd:                                            [  OK  ]
Starting httpd:                                            [  OK  ]
Restarting pki-cad Service
Stopping pki-ca:                                           [  OK  ]
Starting pki-ca:                                           [  OK  ]
Restarting smb Service
Shutting down SMB services:                                [  OK  ]
Starting SMB services:                                     [  OK  ]
Restarting winbind Service

Shutting down Winbind services:                            [  OK  ]
Starting Winbind services:                                 [  OK  ]

[root@rhel6-1 ~]# klist
Ticket cache: FILE:/tmp/krb5cc_0
Default principal: admin

Valid starting     Expires            Service principal
11/08/12 12:33:27  11/09/12 12:33:25  krbtgt/TESTRELM.COM

So, principal didn't switch to cifs and exports seen in init scripts so looks fixed to me.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2013-0506.html