Allow More Apps to Recv UDP Sockets from SystemServer

This gives the privilege to system apps, platform apps,
ephemeral apps, and privileged apps to receive a
UDP socket from the system server. This is being added
for supporting UDP Encapsulation sockets for IPsec, which
must be provided by the system.

This is an analogous change to a previous change that
permitted these sockets for untrusted_apps:
0f75a62e

Bug: 70389346
Test: IpSecManagerTest, System app verified with SL4A
Change-Id: Iec07e97012e0eab92a95fae9818f80f183325c31

private/app.te

 # TODO: deal with tmpfs_domain pub/priv split properly
 # Read system properties managed by zygote.
 allow appdomain zygote_tmpfs:file read;
+
+neverallow appdomain system_server:udp_socket {
+        accept append bind create getopt ioctl listen lock name_bind
+        relabelfrom relabelto setattr setopt shutdown };

private/ephemeral_app.te

@@ -41,6 +41,10 @@ allow ephemeral_app traced:fd use;
 allow ephemeral_app traced_tmpfs:file { read write getattr map };
 unix_socket_connect(ephemeral_app, traced_producer, traced)
 
+# allow ephemeral apps to use UDP sockets provided by the system server but not
+# modify them other than to connect
+allow ephemeral_app system_server:udp_socket { connect getattr read recvfrom sendto write };
+
 ###
 ### neverallow rules
 ###

private/platform_app.te

@@ -67,6 +67,10 @@ allow platform_app preloads_media_file:dir r_dir_perms;
 
 read_runtime_log_tags(platform_app)
 
+# allow platform apps to use UDP sockets provided by the system server but not
+# modify them other than to connect
+allow platform_app system_server:udp_socket { connect getattr read recvfrom sendto write };
+
 ###
 ### Neverallow rules
 ###

private/priv_app.te

@@ -128,6 +128,10 @@ dontaudit priv_app device:dir read;
 dontaudit priv_app proc_interrupts:file read;
 dontaudit priv_app proc_modules:file read;
 
+# allow privileged apps to use UDP sockets provided by the system server but not
+# modify them other than to connect
+allow priv_app system_server:udp_socket { connect getattr read recvfrom sendto write };
+
 ###
 ### neverallow rules
 ###

private/system_app.te

@@ -114,6 +114,10 @@ allow system_app {
 control_logd(system_app)
 read_runtime_log_tags(system_app)
 
+# allow system apps to use UDP sockets provided by the system server but not
+# modify them other than to connect
+allow system_app system_server:udp_socket { connect getattr read recvfrom sendto write };
+
 ###
 ### Neverallow rules
 ###

private/untrusted_app.te

@@ -24,14 +24,6 @@ untrusted_app_domain(untrusted_app)
 net_domain(untrusted_app)
 bluetooth_domain(untrusted_app)
 
-# allow untrusted apps to use UDP sockets provided by the system server but not
-# modify them other than to connect
-allow untrusted_app system_server:udp_socket { connect getattr read recvfrom sendto write };
-
 # Allow the allocation and use of ptys
 # Used by: https://play.google.com/store/apps/details?id=jackpal.androidterm
 create_pty(untrusted_app)
-
-neverallow untrusted_app system_server:udp_socket {
-        accept append bind create getopt ioctl listen lock name_bind
-        relabelfrom relabelto setattr setopt shutdown };

private/untrusted_app_all.te

@@ -111,3 +111,7 @@ allow untrusted_app_all vendor_app_file:lnk_file { open getattr read };
 allow untrusted_app_all traced:fd use;
 allow untrusted_app_all traced_tmpfs:file { read write getattr map };
 unix_socket_connect(untrusted_app_all, traced_producer, traced)
+
+# allow untrusted apps to use UDP sockets provided by the system server but not
+# modify them other than to connect
+allow untrusted_app_all system_server:udp_socket { connect getattr read recvfrom sendto write };