Define sepolicy for redirect-socket-calls feature
Define two property_context.
1. vendor_socket_hook_prop - for ro.vendor.redirect_socket_calls. The
property set once in vendor_init context. It's evaluated at process
start time and is cannot change at runtime on a given device. The set
permission is restricted to vendor_init. The read permission is
unrestricted.
2. socket_hook_prop - for net.redirect_socket_calls.hooked. The
property can be changed by System Server at runtime. It's evaluated when
shimmed socket functions is called. The set permission is restricted to
System Server. The read permission is unrestricted.
Bug: Bug: 141611769
Test: System Server can set net.redirect_socket_calls.hooked
libnetd_client can read both properties
libnetd_client can't set both properties
Change-Id: Ic42269539923e6930cc0ee3df8ba032797212395
diff --git a/private/system_server.te b/private/system_server.te
index 4e74fee..de2a064 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -604,6 +604,7 @@
set_prop(system_server, exported_overlay_prop)
set_prop(system_server, pm_prop)
set_prop(system_server, exported_pm_prop)
+set_prop(system_server, socket_hook_prop)
userdebug_or_eng(`set_prop(system_server, wifi_log_prop)')
# ctl interface
@@ -1135,3 +1136,6 @@
# system_server cannot use this access to read perf event data like process stacks.
allow system_server self:perf_event { open write cpu kernel };
neverallow system_server self:perf_event ~{ open write cpu kernel };
+
+# Do not allow any domain other than init or system server to set the property
+neverallow { domain -init -system_server } socket_hook_prop:property_service set;