microdroid/sepolicy/system/private/netd.te

typeattribute netd coredomain;

init_daemon_domain(netd)

# Allow netd to spawn dnsmasq in it's own domain
domain_auto_trans(netd, dnsmasq_exec, dnsmasq)

# Allow netd to start clatd in its own domain and kill it
domain_auto_trans(netd, clatd_exec, clatd)
allow netd clatd:process signal;

# give netd permission to setup iptables rule with xt_bpf, attach program to cgroup, and read/write
# the map created by bpfloader
allow netd bpfloader:bpf { prog_run map_read map_write };

# in order to invoke side effect of close() on such a socket calling synchronize_rcu()
# TODO: Remove this permission when 4.9 kernel is deprecated.
allow netd self:key_socket create;

set_prop(netd, ctl_mdnsd_prop)
set_prop(netd, netd_stable_secret_prop)

get_prop(netd, adbd_config_prop)
get_prop(netd, bpf_progs_loaded_prop)
get_prop(netd, hwservicemanager_prop)
get_prop(netd, device_config_netd_native_prop)

# Allow netd to write to statsd.
unix_socket_send(netd, statsdw, statsd)

# Allow netd to send callbacks to network_stack
binder_call(netd, network_stack)

# Allow netd to send dump info to dumpstate
allow netd dumpstate:fd use;
allow netd dumpstate:fifo_file { getattr write };

# persist.netd.stable_secret contains RFC 7217 secret key which should never be
# leaked to other processes. Make sure it never leaks.
neverallow { domain -netd -init -dumpstate } netd_stable_secret_prop:file r_file_perms;

# We want to ensure that no other process ever tries tampering with persist.netd.stable_secret,
# the RFC 7217 secret key managed by netd. Doing so could compromise user privacy.
neverallow { domain -netd -init } netd_stable_secret_prop:property_service set;