Since apt 1.8.1 (more precisely since commit
60cc44d160),
apt calls D-Bus method "Inhibit" of interface
"org.freedesktop.login1.Manager" in order to prevent a shutdown from
happening while installing software.
The call from apt to systemd-logind was already allowed through
unconfined_dbus_send(apt_t), but not the reply, which triggered the
following audit log:
type=USER_AVC msg=audit(1567780304.196:651): pid=287 uid=105
auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t
msg='avc: denied { send_msg } for msgtype=method_return
dest=:1.137 spid=290 tpid=29557
scontext=system_u:system_r:systemd_logind_t
tcontext=sysadm_u:sysadm_r:apt_t tclass=dbus permissive=0
exe="/usr/bin/dbus-daemon" sauid=105 hostname=? addr=? terminal=?'
Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
The latest revision of the labeled policy patches which enable both labeled
and unlabeled policy support for NetLabel. This revision takes into account
Chris' feedback from the first version and reduces the number of interface
calls in each domain down to two at present: one for unlabeled access, one for
NetLabel access. The older, transport layer specific interfaces, are still
present for use by third-party modules but are not used in the default policy
modules.
trunk: Use netmsg initial SID for MLS-only Netlabel packets, from Paul Moore.
This patch changes the policy to use the netmsg initial SID as the "base"
SID/context for NetLabel packets which only have MLS security attributes.
Currently we use the unlabeled initial SID which makes it very difficult to
distinquish between actual unlabeled packets and those packets which have MLS
security attributes.
