Description of problem:
Tried to set the password of a user created with "kuser".

sudo passwd <user>
SELinux is preventing /usr/bin/passwd from 'create' accesses on the file nshadow.

*****  Plugin catchall_labels (83.8 confidence) suggests  ********************

If you want to allow passwd to have create access on the nshadow file
Then you need to change the label on nshadow
Do
# semanage fcontext -a -t FILE_TYPE 'nshadow'
where FILE_TYPE is one of the following: faillog_t, krb5_host_rcache_t, lastlog_t, passwd_file_t, pcscd_var_run_t, shadow_t. 
Then execute: 
restorecon -v 'nshadow'


*****  Plugin catchall (17.1 confidence) suggests  ***************************

If you believe that passwd should be allowed create access on the nshadow file 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 passwd /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                unconfined_u:unconfined_r:passwd_t:s0-s0:c0.c1023
Target Context                unconfined_u:object_r:etc_t:s0
Target Objects                nshadow [ file ]
Source                        passwd
Source Path                   /usr/bin/passwd
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           passwd-0.78.99-3.fc18.x86_64
Target RPM Packages           
Policy RPM                    selinux-policy-3.11.1-98.fc18.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 3.9.11-200.fc18.x86_64 #1 SMP Mon
                              Jul 22 21:04:50 UTC 2013 x86_64 x86_64
Alert Count                   3
First Seen                    2013-08-01 07:40:05 BST
Last Seen                     2013-08-01 07:40:54 BST
Local ID                      3b26c030-9e43-4398-b2e8-c779a80ff281

Raw Audit Messages
type=AVC msg=audit(1375339254.519:383): avc:  denied  { create } for  pid=1849 comm="passwd" name="nshadow" scontext=unconfined_u:unconfined_r:passwd_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:etc_t:s0 tclass=file


type=SYSCALL msg=audit(1375339254.519:383): arch=x86_64 syscall=open success=no exit=EACCES a0=7f7a3901ac52 a1=241 a2=1b6 a3=238 items=0 ppid=1790 pid=1849 auid=1000 uid=1002 gid=1002 euid=0 suid=0 fsuid=0 egid=1002 sgid=1002 fsgid=1002 ses=1 tty=pts1 comm=passwd exe=/usr/bin/passwd subj=unconfined_u:unconfined_r:passwd_t:s0-s0:c0.c1023 key=(null)

Hash: passwd,passwd_t,etc_t,file,create

audit2allow

#============= passwd_t ==============
allow passwd_t etc_t:file create;

audit2allow -R
require {
	type passwd_t;
}

#============= passwd_t ==============
files_manage_etc_files(passwd_t)


Additional info:
reporter:       libreport-2.1.5
hashmarkername: setroubleshoot
kernel:         3.9.11-200.fc18.x86_64
type:           libreport