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Accept accessUids from telephony when it's the carrier config app

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Test: FrameworksNetTests, new test in this patch
Change-Id: I50fab91e107c51d33a5e529c73b83db198a88d2c
This commit is contained in:
Chalard Jean
2022-01-26 16:54:05 +09:00
parent d36de12652
commit ac9ace0bbe
5 changed files with 243 additions and 68 deletions
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33
service/src/com/android/server/ConnectivityService.java
View File

@@ -1338,6 +1338,18 @@ public class ConnectivityService extends IConnectivityManager.Stub
return new LocationPermissionChecker(context);
}
/**
* @see CarrierPrivilegeAuthenticator
*/
public CarrierPrivilegeAuthenticator makeCarrierPrivilegeAuthenticator(
@NonNull final Context context, @NonNull final TelephonyManager tm) {
if (SdkLevel.isAtLeastT()) {
return new CarrierPrivilegeAuthenticator(context, tm);
} else {
return null;
}
}
/**
* @see DeviceConfigUtils#isFeatureEnabled
*/
@@ -1426,12 +1438,8 @@ public class ConnectivityService extends IConnectivityManager.Stub
mTelephonyManager = (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);
mAppOpsManager = (AppOpsManager) mContext.getSystemService(Context.APP_OPS_SERVICE);
mLocationPermissionChecker = mDeps.makeLocationPermissionChecker(mContext);
if (SdkLevel.isAtLeastT()) {
mCarrierPrivilegeAuthenticator =
new CarrierPrivilegeAuthenticator(mContext, mTelephonyManager);
} else {
mCarrierPrivilegeAuthenticator = null;
}
mCarrierPrivilegeAuthenticator =
mDeps.makeCarrierPrivilegeAuthenticator(mContext, mTelephonyManager);
// To ensure uid state is synchronized with Network Policy, register for
// NetworkPolicyManagerService events must happen prior to NetworkPolicyManagerService
@@ -4157,11 +4165,11 @@ public class ConnectivityService extends IConnectivityManager.Stub
}
}
private boolean hasCarrierPrivilegeForNetworkRequest(int callingUid,
NetworkRequest networkRequest) {
private boolean hasCarrierPrivilegeForNetworkCaps(final int callingUid,
@NonNull final NetworkCapabilities caps) {
if (SdkLevel.isAtLeastT() && mCarrierPrivilegeAuthenticator != null) {
return mCarrierPrivilegeAuthenticator.hasCarrierPrivilegeForNetworkRequest(callingUid,
networkRequest);
return mCarrierPrivilegeAuthenticator.hasCarrierPrivilegeForNetworkCapabilities(
callingUid, caps);
}
return false;
}
@@ -4205,7 +4213,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
}
}
if (req.hasCapability(NetworkCapabilities.NET_CAPABILITY_CBS)) {
if (!hasCarrierPrivilegeForNetworkRequest(nri.mUid, req)
if (!hasCarrierPrivilegeForNetworkCaps(nri.mUid, req.networkCapabilities)
&& !checkConnectivityRestrictedNetworksPermission(
nri.mPid, nri.mUid)) {
requestToBeReleased = req;
@@ -7495,7 +7503,8 @@ public class ConnectivityService extends IConnectivityManager.Stub
nc.setOwnerUid(nai.networkCapabilities.getOwnerUid());
}
nai.declaredCapabilities = new NetworkCapabilities(nc);
NetworkAgentInfo.restrictCapabilitiesFromNetworkAgent(nc, nai.creatorUid);
NetworkAgentInfo.restrictCapabilitiesFromNetworkAgent(nc, nai.creatorUid,
mCarrierPrivilegeAuthenticator);
}
/** Modifies |newNc| based on the capabilities of |underlyingNetworks| and |agentCaps|. */

41
service/src/com/android/server/connectivity/CarrierPrivilegeAuthenticator.java
View File

@@ -17,6 +17,7 @@
package com.android.server.connectivity;
import static android.net.NetworkCapabilities.NET_CAPABILITY_CBS;
import static android.net.NetworkCapabilities.TRANSPORT_CELLULAR;
import android.annotation.NonNull;
import android.content.BroadcastReceiver;
@@ -25,7 +26,7 @@ import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.net.NetworkRequest;
import android.net.NetworkCapabilities;
import android.net.NetworkSpecifier;
import android.net.TelephonyNetworkSpecifier;
import android.os.Build;
@@ -235,24 +236,30 @@ public class CarrierPrivilegeAuthenticator extends BroadcastReceiver {
}
/**
* Check if network request is allowed based upon carrrier service package.
* Check if a UID is the carrier service app of the subscription ID in the provided capabilities
*
* Network request for {@link NET_CAPABILITY_CBS} is allowed if the caller has
* carrier privilege and provides the carrier config. This function checks if caller
* has the same and returns true if it has else false.
* This returns whether the passed UID is the carrier service package for the subscription ID
* stored in the telephony network specifier in the passed network capabilities.
* If the capabilities don't code for a cellular network, or if they don't have the
* subscription ID in their specifier, this returns false.
*
* @param callingUid user identifier that uniquely identifies the caller.
* @param networkRequest the network request for which the carrier privilege is checked.
* @return true if caller has carrier privilege and provides the carrier config else false.
* This method can be used to check that a network request for {@link NET_CAPABILITY_CBS} is
* allowed for the UID of a caller, which must hold carrier privilege and provide the carrier
* config.
* It can also be used to check that a factory is entitled to grant access to a given network
* to a given UID on grounds that it is the carrier service package.
*
* @param callingUid uid of the app claimed to be the carrier service package.
* @param networkCapabilities the network capabilities for which carrier privilege is checked.
* @return true if uid provides the relevant carrier config else false.
*/
public boolean hasCarrierPrivilegeForNetworkRequest(int callingUid,
NetworkRequest networkRequest) {
if (callingUid != Process.INVALID_UID) {
final int subId = getSubIdFromNetworkSpecifier(
networkRequest.getNetworkSpecifier());
return callingUid == getCarrierServiceUidForSubId(subId);
}
return false;
public boolean hasCarrierPrivilegeForNetworkCapabilities(int callingUid,
@NonNull NetworkCapabilities networkCapabilities) {
if (callingUid == Process.INVALID_UID) return false;
if (!networkCapabilities.hasSingleTransport(TRANSPORT_CELLULAR)) return false;
final int subId = getSubIdFromNetworkSpecifier(networkCapabilities.getNetworkSpecifier());
if (SubscriptionManager.INVALID_SUBSCRIPTION_ID == subId) return false;
return callingUid == getCarrierServiceUidForSubId(subId);
}
@VisibleForTesting
@@ -286,7 +293,7 @@ public class CarrierPrivilegeAuthenticator extends BroadcastReceiver {
if (specifier instanceof TelephonyNetworkSpecifier) {
return ((TelephonyNetworkSpecifier) specifier).getSubscriptionId();
}
return SubscriptionManager.DEFAULT_SUBSCRIPTION_ID;
return SubscriptionManager.INVALID_SUBSCRIPTION_ID;
}
@VisibleForTesting

25
service/src/com/android/server/connectivity/NetworkAgentInfo.java
View File

@@ -60,6 +60,7 @@ import android.util.Pair;
import android.util.SparseArray;
import com.android.internal.util.WakeupMessage;
import com.android.modules.utils.build.SdkLevel;
import com.android.server.ConnectivityService;
import java.io.PrintWriter;
@@ -1196,21 +1197,26 @@ public class NetworkAgentInfo implements Comparable<NetworkAgentInfo>, NetworkRa
*
* @param nc the capabilities to sanitize
* @param creatorUid the UID of the process creating this network agent
* @param authenticator the carrier privilege authenticator to check for telephony constraints
*/
public static void restrictCapabilitiesFromNetworkAgent(@NonNull final NetworkCapabilities nc,
final int creatorUid) {
final int creatorUid, @NonNull final CarrierPrivilegeAuthenticator authenticator) {
if (nc.hasTransport(TRANSPORT_TEST)) {
nc.restrictCapabilitiesForTestNetwork(creatorUid);
}
if (!areAccessUidsAcceptableFromNetworkAgent(nc)) {
if (!areAccessUidsAcceptableFromNetworkAgent(nc, authenticator)) {
nc.setAccessUids(new ArraySet<>());
}
}
private static boolean areAccessUidsAcceptableFromNetworkAgent(
@NonNull final NetworkCapabilities nc) {
@NonNull final NetworkCapabilities nc,
@Nullable final CarrierPrivilegeAuthenticator carrierPrivilegeAuthenticator) {
// NCs without access UIDs are fine.
if (!nc.hasAccessUids()) return true;
// S and below must never accept access UIDs, even if an agent sends them, because netd
// didn't support the required feature in S.
if (!SdkLevel.isAtLeastT()) return false;
// On a non-restricted network, access UIDs make no sense
if (nc.hasCapability(NET_CAPABILITY_NOT_RESTRICTED)) return false;
@@ -1219,7 +1225,18 @@ public class NetworkAgentInfo implements Comparable<NetworkAgentInfo>, NetworkRa
// access UIDs
if (nc.hasTransport(TRANSPORT_TEST)) return true;
// TODO : accept more supported cases
// Factories that make cell networks can allow the UID for the carrier service package.
// This can only work in T where there is support for CarrierPrivilegeAuthenticator
if (null != carrierPrivilegeAuthenticator
&& nc.hasSingleTransport(TRANSPORT_CELLULAR)
&& (1 == nc.getAccessUidsNoCopy().size())
&& (carrierPrivilegeAuthenticator.hasCarrierPrivilegeForNetworkCapabilities(
nc.getAccessUidsNoCopy().valueAt(0), nc))) {
return true;
}
// TODO : accept Railway callers
return false;
}