Add SEPolicy for PRNG seeder daemon.
Manual testing protocol:
* Verify prng_seeder daemon is running and has the
correct label (via ps -Z)
* Verify prng_seeder socket present and has correct
label (via ls -Z)
* Verify no SELinux denials
* strace a libcrypto process and verify it reads seeding
data from prng_seeder (e.g. strace bssl rand -hex 1024)
* strace seeder daemon to observe incoming connections
(e.g. strace -f -p `pgrep prng_seeder`)
* Kill daemon, observe that init restarts it
* strace again and observe clients now seed from new instance
Bug: 243933553
Test: Manual - see above
Change-Id: I0a7e339115a2cf6b819730dcf5f8b189a339c57d
diff --git a/private/init.te b/private/init.te
index 9e50bd4..f03a138 100644
--- a/private/init.te
+++ b/private/init.te
@@ -109,6 +109,9 @@
# Allow accessing /sys/kernel/tracing/instances/bootreceiver to set up tracing.
allow init debugfs_bootreceiver_tracing:file w_file_perms;
+# PRNG seeder daemon socket is created and listened on by init before forking.
+allow init prng_seeder:unix_stream_socket { create bind listen };
+
# Devices with kernels where CONFIG_HIST_TRIGGERS isn't enabled will
# attempt to write a non exisiting 'synthetic_events' file, when setting
# up synthetic events. This is a no-op in tracefs.