Description of problem:

Fedora 18 client authenticating against Samba 4 KDC, via SSSD, and automounting home directories over NFS4 with sec=krb5. After booting the client, GDM logins are rejected due to SELinux policy. Switching to text console and logging in resolves the problem.

Version-Release number of selected component (if applicable):

nfs-utils-1.2.7-3.fc18.x86_64
sssd-1.9.4-5.fc18.x86_64
selinux-policy-3.11.1-86.fc18.noarch
selinux-policy-targeted-3.11.1-86.fc18.noarch

How reproducible:

Always?

Steps to Reproduce:
1. Install and configure Kerberos client.
2. Reboot.
3. Try to login.
  
Actual results:

Not allowed to login.

Expected results:

My desktop.

Additional info:

/var/log/messages:

[root@portello log]# grep SELinux messages | tail -n 1
Mar 29 09:15:21 portello setroubleshoot: SELinux is preventing /usr/sbin/rpc.gssd from write access on the directory krb5cc_497cd97092d5c83008b5396a51554d91. For complete SELinux messages. run sealert -l 6f4f209e-12b0-4db2-9a97-9ecb52f9f088

[root@portello log]# sealert -l 6f4f209e-12b0-4db2-9a97-9ecb52f9f088
SELinux is preventing /usr/sbin/rpc.gssd from write access on the directory krb5cc_497cd97092d5c83008b5396a51554d91.

*****  Plugin catchall (100. confidence) suggests  ***************************

If you believe that rpc.gssd should be allowed write access on the krb5cc_497cd97092d5c83008b5396a51554d91 directory by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep rpc.gssd /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp


Additional Information:
Source Context                system_u:system_r:gssd_t:s0
Target Context                system_u:object_r:user_tmp_t:s0
Target Objects                krb5cc_497cd97092d5c83008b5396a51554d91 [ dir ]
Source                        rpc.gssd
Source Path                   /usr/sbin/rpc.gssd
Port                          <Unknown>
Host                          portello.bluebox.pp.se
Source RPM Packages           nfs-utils-1.2.7-3.fc18.x86_64
Target RPM Packages           
Policy RPM                    selinux-policy-3.11.1-86.fc18.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     portello.bluebox.pp.se
Platform                      Linux portello.bluebox.pp.se 3.8.4-202.fc18.x86_64
                              #1 SMP Thu Mar 21 17:02:20 UTC 2013 x86_64 x86_64
Alert Count                   14
First Seen                    2013-03-27 16:34:55 CET
Last Seen                     2013-03-29 09:15:19 CET
Local ID                      6f4f209e-12b0-4db2-9a97-9ecb52f9f088

Raw Audit Messages
type=AVC msg=audit(1364544919.917:336): avc:  denied  { write } for  pid=605 comm="rpc.gssd" name="krb5cc_497cd97092d5c83008b5396a51554d91" dev="tmpfs" ino=23576 scontext=system_u:system_r:gssd_t:s0 tcontext=system_u:object_r:user_tmp_t:s0 tclass=dir


type=SYSCALL msg=audit(1364544919.917:336): arch=x86_64 syscall=open success=no exit=EACCES a0=7f5977c3e890 a1=c2 a2=180 a3=6093b4fd6 items=0 ppid=1 pid=605 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 ses=4294967295 tty=(none) comm=rpc.gssd exe=/usr/sbin/rpc.gssd subj=system_u:system_r:gssd_t:s0 key=(null)

Hash: rpc.gssd,gssd_t,user_tmp_t,dir,write

audit2allow

#============= gssd_t ==============
allow gssd_t user_tmp_t:dir write;

audit2allow -R
require {
	type gssd_t;
}

#============= gssd_t ==============
userdom_manage_user_tmp_dirs(gssd_t)

[root@portello log]# sesearch --allow -s gssd_t -c dir -p write
Found 6 semantic av rules:
   allow gssd_t var_lib_nfs_t : dir { ioctl read write create getattr setattr lock unlink link rename add_name remove_name reparent search rmdir open } ; 
   allow gssd_t krb5_host_rcache_t : dir { ioctl read write getattr lock add_name remove_name search open } ; 
   allow gssd_t gssd_tmp_t : dir { ioctl read write create getattr setattr lock unlink link rename add_name remove_name reparent search rmdir open } ; 
   allow gssd_t tmp_t : dir { ioctl read write getattr lock add_name remove_name search open } ; 
   allow gssd_t auth_cache_t : dir { ioctl read write create getattr setattr lock unlink link rename add_name remove_name reparent search rmdir open } ; 
   allow daemon root_t : dir { ioctl read write getattr lock add_name remove_name search open } ;