Description of problem:
SELinux is preventing ModemManager from 'read' accesses on the file /var/lib/sss/mc/passwd.

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

If you believe that ModemManager should be allowed read access on the passwd 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:
# ausearch -c 'ModemManager' --raw | audit2allow -M my-ModemManager
# semodule -X 300 -i my-ModemManager.pp

Additional Information:
Source Context                system_u:system_r:modemmanager_t:s0
Target Context                system_u:object_r:sssd_public_t:s0
Target Objects                /var/lib/sss/mc/passwd [ file ]
Source                        ModemManager
Source Path                   ModemManager
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           sssd-common-1.16.2-5.fc29.x86_64
Policy RPM                    selinux-policy-3.14.2-26.fc29.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Permissive
Host Name                     (removed)
Platform                      Linux (removed) 4.18.0-0.rc4.git4.1.fc29.x86_64 #1
                              SMP Fri Jul 13 15:58:04 UTC 2018 x86_64 x86_64
Alert Count                   2
First Seen                    2018-07-17 01:14:46 NZST
Last Seen                     2018-07-17 01:14:46 NZST
Local ID                      63208a83-69a0-4641-b509-4af45752c824

Raw Audit Messages
type=AVC msg=audit(1531746886.166:164): avc:  denied  { read } for  pid=898 comm="mbim-proxy" name="passwd" dev="nvme0n1p7" ino=2273073 scontext=system_u:system_r:modemmanager_t:s0 tcontext=system_u:object_r:sssd_public_t:s0 tclass=file permissive=1


Hash: ModemManager,modemmanager_t,sssd_public_t,file,read

Version-Release number of selected component:
selinux-policy-3.14.2-26.fc29.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.9.5
hashmarkername: setroubleshoot
kernel:         4.18.0-0.rc4.git4.1.fc29.x86_64
type:           libreport