Description of problem:

In fwupd 1.6.3 we connect to NetworkManager at startup to ensure that the USB network interface is up so we can talk to the server BMC controller (which is disabled by default in RHEL). This fails when SELinux is enabled and the daemon fails to start the redfish plugin, which means most of the updatable devices do not show up.

Version-Release number of selected component (if applicable): selinux-policy-34.14-1.fc34.noarch

How reproducible: Always on RHEL, only on Fedora if the USB interface is not set to "auto-connect"

Steps to Reproduce:
1. Update to fwupd 1.6.2 using dnf update
2. Disable autoconnect of the USB network device
3. do "sudo service fwupd restart" on any machine with a BMC

Actual results:
I get an AVC and fwupd startup hangs for 30 seconds.

Expected results:
That fwupd is able to talk to NetworkManager

Additional info:

(This was generated on RHEL 8.4, but the AVC should be the same)

type=USER_AVC msg=audit(1628784233.943:253): pid=1377 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { send_msg } for msgtype=method_return dest=:1.593 spid=1691 tpid=36436 scontext=system_u:system_r:NetworkManager_t:s0 tcontext=system_u:system_r:fwupd_t:s0 tclass=dbus permissive=0  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'UID="dbus" AUID="unset" SAUID="dbus"