This leaves only the existence of mdnsd domain as public API. All
other rules are implementation details of this domains's policy and
are thus now private.

Test: No change to policy according to sesearch, except for
      disappearance of all allow rules to do with mdnsd_current (as
      expected).
Bug: 31364497

Change-Id: Ia4f01d91e7d593401e8cde2d796a0f1023f6dae4

Divide policy into public and private components.  This is the first
step in splitting the policy creation for platform and non-platform
policies.  The policy in the public directory will be exported for use
in non-platform policy creation.  Backwards compatibility with it will
be achieved by converting the exported policy into attribute-based
policy when included as part of the non-platform policy and a mapping
file will be maintained to be included with the platform policy that
maps exported attributes of previous versions to the current platform
version.

Eventually we would like to create a clear interface between the
platform and non-platform device components so that the exported policy,
and the need for attributes is minimal.  For now, almost all types and
avrules are left in public.

Test: Tested by building policy and running on device.

Change-Id: Idef796c9ec169259787c3f9d8f423edf4ce27f8c

Remove domain_deprecated from mdnsd. This removes some unnecessarily
permissive rules from mdnsd.

As part of this, re-allow /proc/net access, which is removed as
a result of removing domain_deprecated.

Bug: 25433265
Change-Id: Ie1cf27179ac2e9170cf4cd418aea3256b9534603

Motivation: Domain is overly permissive. Start removing permissions
from domain and assign them to the domain_deprecated attribute.
Domain_deprecated and domain can initially be assigned to all
domains. The goal is to not assign domain_deprecated to new domains
and to start removing domain_deprecated where it is not required or
reassigning the appropriate permissions to the inheriting domain
when necessary.

Bug: 25433265
Change-Id: I8b11cb137df7bdd382629c98d916a73fe276413c

When using MLS (i.e. enabling levelFrom= in seapp_contexts),
certain domains and types must be exempted from the normal
constraints defined in the mls file.  Beyond the current
set, adbd, logd, mdnsd, netd, and servicemanager need to
be able to read/write to any level in order to communicate
with apps running with any level, and the logdr and logdw
sockets need to be writable by apps running with any level.

This change has no impact unless levelFrom= is specified in
seapp_contexts, so by itself it is a no-op.

Change-Id: I36ed382b04a60a472e245a77055db294d3e708c3
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

Change-Id: I610723eb9f2edcb4525b0e2d7e55616a1d93957d
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

(cherry picked from commit 96ff4c05)

Change-Id: Idfd734f07687925c1f35d2629d4b59d46822d0d4

Change-Id: I0a06fa32a46e515671b4e9a6f68e1a3f8b2c21a8
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>