platform_system_sepolicy/public/tzdatacheck.te
Nick Kralevich 5e37271df8 Introduce system_file_type
system_file_type is a new attribute used to identify files which exist
on the /system partition. It's useful for allow rules in init, which are
based off of a blacklist of writable files. Additionally, it's useful
for constructing neverallow rules to prevent regressions.

Additionally, add commented out tests which enforce that all files on
the /system partition have the system_file_type attribute. These tests
will be uncommented in a future change after all the device-specific
policies are cleaned up.

Test: Device boots and no obvious problems.
Change-Id: Id9bae6625f042594c8eba74ca712abb09702c1e5
2018-09-27 12:52:09 -07:00

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# The tzdatacheck command run by init.
type tzdatacheck, domain;
type tzdatacheck_exec, system_file_type, exec_type, file_type;
allow tzdatacheck zoneinfo_data_file:dir create_dir_perms;
allow tzdatacheck zoneinfo_data_file:file unlink;
# Below are strong assertion that only init, system_server and tzdatacheck
# can modify the /data time zone rules directories. This is to make it very
# clear that only these domains should modify the actual time zone rules data.
# The tzdatacheck binary itself may be executed by shell for tests but it must
# not be able to modify the real rules.
# If other users / binaries could modify time zone rules on device this might
# have negative implications for users (who may get incorrect local times)
# or break assumptions made / invalidate data held by the components actually
# responsible for updating time zone rules.
neverallow { domain -system_server -init -tzdatacheck } zoneinfo_data_file:file no_w_file_perms;
neverallow { domain -system_server -init -tzdatacheck } zoneinfo_data_file:dir no_w_dir_perms;