Description of problem:
Alert popped up when installing the sendmail package.
SELinux is preventing sss_cache from 'write' accesses on the directory /var/lib/sss/db.

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

If you believe that sss_cache should be allowed write access on the db 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:
# ausearch -c 'sss_cache' --raw | audit2allow -M my-ssscache
# semodule -X 300 -i my-ssscache.pp

Additional Information:
Source Context                unconfined_u:unconfined_r:useradd_t:s0-s0:c0.c1023
Target Context                system_u:object_r:sssd_var_lib_t:s0
Target Objects                /var/lib/sss/db [ dir ]
Source                        sss_cache
Source Path                   sss_cache
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           sssd-common-1.16.3-2.fc28.x86_64
Policy RPM                    selinux-policy-3.14.1-48.fc28.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.19.7-200.fc28.x86_64 #1 SMP Wed
                              Dec 5 22:47:13 UTC 2018 x86_64 x86_64
Alert Count                   4
First Seen                    2018-12-13 21:27:05 CST
Last Seen                     2018-12-13 21:27:05 CST
Local ID                      3fe555bb-32bf-41e4-ab15-3b2c6d76a221

Raw Audit Messages
type=AVC msg=audit(1544758025.454:551): avc:  denied  { write } for  pid=27846 comm="sss_cache" name="db" dev="dm-0" ino=922503 scontext=unconfined_u:unconfined_r:useradd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:sssd_var_lib_t:s0 tclass=dir permissive=0


Hash: sss_cache,useradd_t,sssd_var_lib_t,dir,write

Version-Release number of selected component:
selinux-policy-3.14.1-48.fc28.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.9.5
hashmarkername: setroubleshoot
kernel:         4.19.7-200.fc28.x86_64
type:           libreport