Check carrier privilege for CBS network requests synchronously
Normally if an app calls requestNetwork with capabilities that it
does not have permission to request, it gets a SecurityException,
except if it requests NET_CAPABILITY_CBS, in which case the request
will not throw but the app will get an onUnavailable callback.
Make this codepath throw as well. This simplifies the code and makes
the app-visible behaviour more consistent (and consistent with what
happens in S and below). The reason the code was written this way is because the carrier privilege app should receive a callback if it
loses permission. But onUnavailable is also not the best callback to
send, since it is used very rarely and also releases the app's
request. It seems better to leave the request registered and send
onLost.
Test: atest FrameworksNetTests
Bug: 194332512
Change-Id: I5eaeb415a6654851246e38599a996fbd9366fde0
(cherry picked from commit 96bd9fe4dec806ba615691d091b2f696ecd798fe)
Merged-In: I5eaeb415a6654851246e38599a996fbd9366fde0
diff --git a/service/src/com/android/server/ConnectivityService.java b/service/src/com/android/server/ConnectivityService.java
index c848edf..20165a3 100644
--- a/service/src/com/android/server/ConnectivityService.java
+++ b/service/src/com/android/server/ConnectivityService.java
@@ -609,13 +609,6 @@
// Handle private DNS validation status updates.
private static final int EVENT_PRIVATE_DNS_VALIDATION_UPDATE = 38;
- /**
- * used to remove a network request, either a listener or a real request and call unavailable
- * arg1 = UID of caller
- * obj = NetworkRequest
- */
- private static final int EVENT_RELEASE_NETWORK_REQUEST_AND_CALL_UNAVAILABLE = 39;
-
/**
* Event for NetworkMonitor/NetworkAgentInfo to inform ConnectivityService that the network has
* been tested.
@@ -4507,7 +4500,7 @@
private boolean hasCarrierPrivilegeForNetworkCaps(final int callingUid,
@NonNull final NetworkCapabilities caps) {
- if (SdkLevel.isAtLeastT() && mCarrierPrivilegeAuthenticator != null) {
+ if (mCarrierPrivilegeAuthenticator != null) {
return mCarrierPrivilegeAuthenticator.hasCarrierPrivilegeForNetworkCapabilities(
callingUid, caps);
}
@@ -4537,7 +4530,6 @@
private void handleRegisterNetworkRequests(@NonNull final Set<NetworkRequestInfo> nris) {
ensureRunningOnConnectivityServiceThread();
- NetworkRequest requestToBeReleased = null;
for (final NetworkRequestInfo nri : nris) {
mNetworkRequestInfoLogs.log("REGISTER " + nri);
checkNrisConsistency(nri);
@@ -4552,13 +4544,6 @@
}
}
}
- if (req.hasCapability(NetworkCapabilities.NET_CAPABILITY_CBS)) {
- if (!hasCarrierPrivilegeForNetworkCaps(nri.mUid, req.networkCapabilities)
- && !checkConnectivityRestrictedNetworksPermission(
- nri.mPid, nri.mUid)) {
- requestToBeReleased = req;
- }
- }
}
// If this NRI has a satisfier already, it is replacing an older request that
@@ -4570,11 +4555,6 @@
}
}
- if (requestToBeReleased != null) {
- releaseNetworkRequestAndCallOnUnavailable(requestToBeReleased);
- return;
- }
-
if (mFlags.noRematchAllRequestsOnRegister()) {
rematchNetworksAndRequests(nris);
} else {
@@ -5414,11 +5394,6 @@
/* callOnUnavailable */ false);
break;
}
- case EVENT_RELEASE_NETWORK_REQUEST_AND_CALL_UNAVAILABLE: {
- handleReleaseNetworkRequest((NetworkRequest) msg.obj, msg.arg1,
- /* callOnUnavailable */ true);
- break;
- }
case EVENT_SET_ACCEPT_UNVALIDATED: {
Network network = (Network) msg.obj;
handleSetAcceptUnvalidated(network, toBool(msg.arg1), toBool(msg.arg2));
@@ -6637,7 +6612,7 @@
case REQUEST:
networkCapabilities = new NetworkCapabilities(networkCapabilities);
enforceNetworkRequestPermissions(networkCapabilities, callingPackageName,
- callingAttributionTag);
+ callingAttributionTag, callingUid);
// TODO: this is incorrect. We mark the request as metered or not depending on
// the state of the app when the request is filed, but we never change the
// request if the app changes network state. http://b/29964605
@@ -6727,26 +6702,19 @@
}
private void enforceNetworkRequestPermissions(NetworkCapabilities networkCapabilities,
- String callingPackageName, String callingAttributionTag) {
+ String callingPackageName, String callingAttributionTag, final int callingUid) {
if (networkCapabilities.hasCapability(NET_CAPABILITY_NOT_RESTRICTED) == false) {
- if (!networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_CBS)) {
- enforceConnectivityRestrictedNetworksPermission(true /* checkUidsAllowedList */);
+ // For T+ devices, callers with carrier privilege could request with CBS capabilities.
+ if (networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_CBS)
+ && hasCarrierPrivilegeForNetworkCaps(callingUid, networkCapabilities)) {
+ return;
}
+ enforceConnectivityRestrictedNetworksPermission(true /* checkUidsAllowedList */);
} else {
enforceChangePermission(callingPackageName, callingAttributionTag);
}
}
- private boolean checkConnectivityRestrictedNetworksPermission(int callerPid, int callerUid) {
- if (checkAnyPermissionOf(callerPid, callerUid,
- android.Manifest.permission.CONNECTIVITY_USE_RESTRICTED_NETWORKS)
- || checkAnyPermissionOf(callerPid, callerUid,
- android.Manifest.permission.CONNECTIVITY_INTERNAL)) {
- return true;
- }
- return false;
- }
-
@Override
public boolean requestBandwidthUpdate(Network network) {
enforceAccessPermission();
@@ -6805,7 +6773,7 @@
final int callingUid = mDeps.getCallingUid();
networkCapabilities = new NetworkCapabilities(networkCapabilities);
enforceNetworkRequestPermissions(networkCapabilities, callingPackageName,
- callingAttributionTag);
+ callingAttributionTag, callingUid);
enforceMeteredApnPolicy(networkCapabilities);
ensureRequestableCapabilities(networkCapabilities);
ensureSufficientPermissionsForRequest(networkCapabilities,
@@ -6928,13 +6896,6 @@
EVENT_RELEASE_NETWORK_REQUEST, mDeps.getCallingUid(), 0, networkRequest));
}
- private void releaseNetworkRequestAndCallOnUnavailable(NetworkRequest networkRequest) {
- ensureNetworkRequestHasType(networkRequest);
- mHandler.sendMessage(mHandler.obtainMessage(
- EVENT_RELEASE_NETWORK_REQUEST_AND_CALL_UNAVAILABLE, mDeps.getCallingUid(), 0,
- networkRequest));
- }
-
private void handleRegisterNetworkProvider(NetworkProviderInfo npi) {
if (mNetworkProviderInfos.containsKey(npi.messenger)) {
// Avoid creating duplicates. even if an app makes a direct AIDL call.
diff --git a/tests/unit/java/com/android/server/ConnectivityServiceTest.java b/tests/unit/java/com/android/server/ConnectivityServiceTest.java
index 37df4eb..86371e7 100644
--- a/tests/unit/java/com/android/server/ConnectivityServiceTest.java
+++ b/tests/unit/java/com/android/server/ConnectivityServiceTest.java
@@ -5858,7 +5858,7 @@
}
/**
- * Validate the callback flow CBS request without carrier privilege.
+ * Validate the service throws if request with CBS but without carrier privilege.
*/
@Test
public void testCBSRequestWithoutCarrierPrivilege() throws Exception {
@@ -5867,10 +5867,8 @@
final TestNetworkCallback networkCallback = new TestNetworkCallback();
mServiceContext.setPermission(CONNECTIVITY_USE_RESTRICTED_NETWORKS, PERMISSION_DENIED);
- // Now file the test request and expect it.
- mCm.requestNetwork(nr, networkCallback);
- networkCallback.expectCallback(CallbackEntry.UNAVAILABLE, (Network) null);
- mCm.unregisterNetworkCallback(networkCallback);
+ // Now file the test request and expect the service throws.
+ assertThrows(SecurityException.class, () -> mCm.requestNetwork(nr, networkCallback));
}
private static class TestKeepaliveCallback extends PacketKeepaliveCallback {