[Suggestion] Check foreground user for API call

Also, squashes the follow up commit to create a single CL for
backporting:
=======
PasspointManager: Don't allow bg user to modify passpoint profiles
Also, add safety net logging for this bug.
=======

Bug: 174749461
Test: atest com.android.server.wifi
Change-Id: Ifc79ffeb04a7be99a9c60d9414b72e88275c0514
Merged-In: Ifc79ffeb04a7be99a9c60d9414b72e88275c0514
(cherry picked from commit e799efba85cbe52044a067869af71d9c15b573bb)
(cherry picked from commit 23685b8604571ec623e539f4f9c66db65c9dde81)

8 files changed, 82 insertions, 47 deletions

diff --git a/service/java/com/android/server/wifi/WifiConfigManager.java b/service/java/com/android/server/wifi/WifiConfigManager.java
index bac395343..eacc8e5c4 100644
--- a/service/java/com/android/server/wifi/WifiConfigManager.java
+++ b/service/java/com/android/server/wifi/WifiConfigManager.java
@@ -720,28 +720,6 @@ public class WifiConfigManager {
     }
 
     /**
-     * Check if the given UID belongs to the current foreground user. This is
-     * used to prevent apps running in background users from modifying network
-     * configurations.
-     * <p>
-     * UIDs belonging to system internals (such as SystemUI) are always allowed,
-     * since they always run as {@link UserHandle#USER_SYSTEM}.
-     *
-     * @param uid uid of the app.
-     * @return true if the given UID belongs to the current foreground user,
-     *         otherwise false.
-     */
-    private boolean doesUidBelongToCurrentUser(int uid) {
-        if (uid == android.os.Process.SYSTEM_UID || uid == mSystemUiUid) {
-            return true;
-        } else {
-            return WifiConfigurationUtil.doesUidBelongToAnyProfile(
-                    uid, mUserManager.getProfiles(mCurrentUserId));
-        }
-    }
-
-    /**
-     * Copy over public elements from an external WifiConfiguration object to the internal
      * configuration object if element has been set in the provided external WifiConfiguration.
      * The only exception is the hidden |IpConfiguration| parameters, these need to be copied over
      * for every update.
@@ -1072,7 +1050,7 @@ public class WifiConfigManager {
      * @return NetworkUpdateResult object representing status of the update.
      */
     public NetworkUpdateResult addOrUpdateNetwork(WifiConfiguration config, int uid) {
-        if (!doesUidBelongToCurrentUser(uid)) {
+        if (!mWifiPermissionsUtil.doesUidBelongToCurrentUser(uid)) {
             Log.e(TAG, "UID " + uid + " not visible to the current user");
             return new NetworkUpdateResult(WifiConfiguration.INVALID_NETWORK_ID);
         }
@@ -1145,7 +1123,7 @@ public class WifiConfigManager {
      * @return true if successful, false otherwise.
      */
     public boolean removeNetwork(int networkId, int uid) {
-        if (!doesUidBelongToCurrentUser(uid)) {
+        if (!mWifiPermissionsUtil.doesUidBelongToCurrentUser(uid)) {
             Log.e(TAG, "UID " + uid + " not visible to the current user");
             return false;
         }
@@ -1478,7 +1456,7 @@ public class WifiConfigManager {
         if (mVerboseLoggingEnabled) {
             Log.v(TAG, "Enabling network " + networkId + " (disableOthers " + disableOthers + ")");
         }
-        if (!doesUidBelongToCurrentUser(uid)) {
+        if (!mWifiPermissionsUtil.doesUidBelongToCurrentUser(uid)) {
             Log.e(TAG, "UID " + uid + " not visible to the current user");
             return false;
         }
@@ -1513,7 +1491,7 @@ public class WifiConfigManager {
         if (mVerboseLoggingEnabled) {
             Log.v(TAG, "Disabling network " + networkId);
         }
-        if (!doesUidBelongToCurrentUser(uid)) {
+        if (!mWifiPermissionsUtil.doesUidBelongToCurrentUser(uid)) {
             Log.e(TAG, "UID " + uid + " not visible to the current user");
             return false;
         }
@@ -1553,7 +1531,7 @@ public class WifiConfigManager {
         if (mVerboseLoggingEnabled) {
             Log.v(TAG, "Update network last connect UID for " + networkId);
         }
-        if (!doesUidBelongToCurrentUser(uid)) {
+        if (!mWifiPermissionsUtil.doesUidBelongToCurrentUser(uid)) {
             Log.e(TAG, "UID " + uid + " not visible to the current user");
             return false;
         }
@@ -2618,8 +2596,8 @@ public class WifiConfigManager {
         Set<Integer> removedNetworkIds = new HashSet<>();
         // Remove any private networks of the old user before switching the userId.
         for (WifiConfiguration config : getInternalConfiguredNetworks()) {
-            if (!config.shared && WifiConfigurationUtil.doesUidBelongToAnyProfile(
-                    config.creatorUid, mUserManager.getProfiles(userId))) {
+            if (!config.shared && !mWifiPermissionsUtil
+                    .doesUidBelongToCurrentUser(config.creatorUid)) {
                 removedNetworkIds.add(config.networkId);
                 localLog("clearInternalUserData: removed config."
                         + " netId=" + config.networkId
@@ -2794,8 +2772,8 @@ public class WifiConfigManager {
 
             // Migrate the legacy Passpoint configurations owned by the current user to
             // {@link PasspointManager}.
-            if (config.isLegacyPasspointConfig && WifiConfigurationUtil.doesUidBelongToAnyProfile(
-                        config.creatorUid, mUserManager.getProfiles(mCurrentUserId))) {
+            if (config.isLegacyPasspointConfig && !mWifiPermissionsUtil
+                    .doesUidBelongToCurrentUser(config.creatorUid)) {
                 legacyPasspointNetId.add(config.networkId);
                 // Migrate the legacy Passpoint configuration and add it to PasspointManager.
                 if (!PasspointManager.addLegacyPasspointConfig(config)) {
@@ -2812,8 +2790,8 @@ public class WifiConfigManager {
             // because all networks were previously stored in a central file. We cannot
             // write these private networks to the user specific store until the corresponding
             // user logs in.
-            if (config.shared || !WifiConfigurationUtil.doesUidBelongToAnyProfile(
-                    config.creatorUid, mUserManager.getProfiles(mCurrentUserId))) {
+            if (config.shared || !mWifiPermissionsUtil
+                    .doesUidBelongToCurrentUser(config.creatorUid)) {
                 sharedConfigurations.add(config);
             } else {
                 userConfigurations.add(config);
diff --git a/service/java/com/android/server/wifi/WifiInjector.java b/service/java/com/android/server/wifi/WifiInjector.java
index 4b8e6829e..c6d294377 100644
--- a/service/java/com/android/server/wifi/WifiInjector.java
+++ b/service/java/com/android/server/wifi/WifiInjector.java
@@ -213,7 +213,7 @@ public class WifiInjector {
         mSimAccessor = new SIMAccessor(mContext);
         mPasspointManager = new PasspointManager(mContext, mWifiNative, mWifiKeyStore, mClock,
                 mSimAccessor, new PasspointObjectFactory(), mWifiConfigManager, mWifiConfigStore,
-                mWifiMetrics);
+                mWifiMetrics, mWifiPermissionsUtil);
         mPasspointNetworkEvaluator = new PasspointNetworkEvaluator(
                 mPasspointManager, mWifiConfigManager, mConnectivityLocalLog);
         mWifiMetrics.setPasspointManager(mPasspointManager);
diff --git a/service/java/com/android/server/wifi/WifiStateMachine.java b/service/java/com/android/server/wifi/WifiStateMachine.java
index ac7d748bb..fda14accb 100644
--- a/service/java/com/android/server/wifi/WifiStateMachine.java
+++ b/service/java/com/android/server/wifi/WifiStateMachine.java
@@ -4094,7 +4094,7 @@ public class WifiStateMachine extends StateMachine implements WifiNative.WifiRss
                     break;
                 case CMD_REMOVE_PASSPOINT_CONFIG:
                     int removeResult = mPasspointManager.removeProvider(
-                            (String) message.obj) ? SUCCESS : FAILURE;
+                            message.sendingUid, (String) message.obj) ? SUCCESS : FAILURE;
                     replyToMessage(message, message.what, removeResult);
                     break;
                 case CMD_GET_PASSPOINT_CONFIGS:
@@ -5481,7 +5481,7 @@ public class WifiStateMachine extends StateMachine implements WifiNative.WifiRss
                     break;
                 case CMD_REMOVE_PASSPOINT_CONFIG:
                     String fqdn = (String) message.obj;
-                    if (mPasspointManager.removeProvider(fqdn)) {
+                    if (mPasspointManager.removeProvider(message.sendingUid, fqdn)) {
                         if (isProviderOwnedNetwork(mTargetNetworkId, fqdn)
                                 || isProviderOwnedNetwork(mLastNetworkId, fqdn)) {
                             logd("Disconnect from current network since its provider is removed");
diff --git a/service/java/com/android/server/wifi/hotspot2/PasspointManager.java b/service/java/com/android/server/wifi/hotspot2/PasspointManager.java
index 5d79ba40a..46ec1a7ea 100644
--- a/service/java/com/android/server/wifi/hotspot2/PasspointManager.java
+++ b/service/java/com/android/server/wifi/hotspot2/PasspointManager.java
@@ -53,6 +53,7 @@ import com.android.server.wifi.hotspot2.anqp.HSOsuProvidersElement;
 import com.android.server.wifi.hotspot2.anqp.OsuProviderInfo;
 import com.android.server.wifi.util.InformationElementUtil;
 import com.android.server.wifi.util.ScanResultUtil;
+import com.android.server.wifi.util.WifiPermissionsUtil;
 
 import java.io.PrintWriter;
 import java.util.ArrayList;
@@ -99,6 +100,7 @@ public class PasspointManager {
     private final WifiConfigManager mWifiConfigManager;
     private final CertificateVerifier mCertVerifier;
     private final WifiMetrics mWifiMetrics;
+    private final WifiPermissionsUtil mWifiPermissionsUtil;
 
     // Counter used for assigning unique identifier to each provider.
     private long mProviderIndex;
@@ -197,7 +199,7 @@ public class PasspointManager {
     public PasspointManager(Context context, WifiNative wifiNative, WifiKeyStore keyStore,
             Clock clock, SIMAccessor simAccessor, PasspointObjectFactory objectFactory,
             WifiConfigManager wifiConfigManager, WifiConfigStore wifiConfigStore,
-            WifiMetrics wifiMetrics) {
+            WifiMetrics wifiMetrics, WifiPermissionsUtil wifiPermissionsUtil) {
         mHandler = objectFactory.makePasspointEventHandler(wifiNative,
                 new CallbackHandler(context));
         mKeyStore = keyStore;
@@ -213,6 +215,7 @@ public class PasspointManager {
         wifiConfigStore.registerStoreData(objectFactory.makePasspointConfigStoreData(
                 mKeyStore, mSimAccessor, new DataSourceHandler()));
         sPasspointManager = this;
+        mWifiPermissionsUtil = wifiPermissionsUtil;
     }
 
     /**
@@ -235,6 +238,10 @@ public class PasspointManager {
             Log.e(TAG, "Invalid configuration");
             return false;
         }
+        if (!mWifiPermissionsUtil.doesUidBelongToCurrentUser(uid)) {
+            Log.e(TAG, "UID " + uid + " not visible to the current user");
+            return false;
+        }
 
         // For Hotspot 2.0 Release 1, the CA Certificate must be trusted by one of the pre-loaded
         // public CAs in the system key store on the device.  Since the provisioning method
@@ -278,16 +285,20 @@ public class PasspointManager {
     /**
      * Remove a Passpoint provider identified by the given FQDN.
      *
+     * @param callingUid Calling UID.
      * @param fqdn The FQDN of the provider to remove
      * @return true if a provider is removed, false otherwise
      */
-    public boolean removeProvider(String fqdn) {
+    public boolean removeProvider(int callingUid, String fqdn) {
         mWifiMetrics.incrementNumPasspointProviderUninstallation();
         if (!mProviders.containsKey(fqdn)) {
             Log.e(TAG, "Config doesn't exist");
             return false;
         }
-
+        if (!mWifiPermissionsUtil.doesUidBelongToCurrentUser(callingUid)) {
+            Log.e(TAG, "UID " + callingUid + " not visible to the current user");
+            return false;
+        }
         mProviders.get(fqdn).uninstallCertsAndKeys();
         mProviders.remove(fqdn);
         mWifiConfigManager.saveToStore(true /* forceWrite */);
diff --git a/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java b/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java
index 52c96183e..debb6e593 100644
--- a/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java
+++ b/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java
@@ -32,6 +32,7 @@ import android.os.RemoteException;
 import android.os.UserManager;
 import android.provider.Settings;
 import android.text.TextUtils;
+import android.util.EventLog;
 
 import com.android.server.wifi.FrameworkFacade;
 import com.android.server.wifi.WifiInjector;
@@ -392,4 +393,32 @@ public class WifiPermissionsUtil {
                 android.Manifest.permission.NETWORK_SETTINGS, uid)
                 == PackageManager.PERMISSION_GRANTED;
     }
+
+    /**
+     * Check if the given UID belongs to the current foreground user. This is
+     * used to prevent apps running in background users from modifying network
+     * configurations.
+     * <p>
+     * UIDs belonging to system internals (such as SystemUI) are always allowed,
+     * since they always run as {@link UserHandle#USER_SYSTEM}.
+     *
+     * @param uid uid of the app.
+     * @return true if the given UID belongs to the current foreground user,
+     *         otherwise false.
+     */
+    public boolean doesUidBelongToCurrentUser(int uid) {
+        if (uid == android.os.Process.SYSTEM_UID
+                // UIDs with the NETWORK_SETTINGS permission are always allowed since they are
+                // acting on behalf of the user.
+                || checkNetworkSettingsPermission(uid)) {
+            return true;
+        }
+        boolean isCurrentProfile = isCurrentProfile(uid);
+        if (!isCurrentProfile) {
+            // Fix for b/174749461
+            EventLog.writeEvent(0x534e4554, "174749461", -1,
+                    "Non foreground user trying to modify wifi configuration");
+        }
+        return isCurrentProfile;
+    }
 }
diff --git a/tests/wifitests/src/com/android/server/wifi/WifiConfigManagerTest.java b/tests/wifitests/src/com/android/server/wifi/WifiConfigManagerTest.java
index c99a1496a..8990f92c1 100644
--- a/tests/wifitests/src/com/android/server/wifi/WifiConfigManagerTest.java
+++ b/tests/wifitests/src/com/android/server/wifi/WifiConfigManagerTest.java
@@ -177,6 +177,7 @@ public class WifiConfigManagerTest {
         when(mWifiPermissionsUtil.checkNetworkSettingsPermission(anyInt())).thenReturn(true);
         when(mWifiPermissionsWrapper.getDevicePolicyManagerInternal())
                 .thenReturn(mDevicePolicyManagerInternal);
+        when(mWifiPermissionsUtil.doesUidBelongToCurrentUser(anyInt())).thenReturn(true);
         createWifiConfigManager();
         mWifiConfigManager.setOnSavedNetworkUpdateListener(mWcmListener);
     }
@@ -2148,6 +2149,8 @@ public class WifiConfigManagerTest {
         setupStoreDataForUserRead(user2Networks, new HashSet<String>());
         // Now switch the user to user 2 and ensure that user 1's private network has been removed.
         when(mUserManager.isUserUnlockingOrUnlocked(user2)).thenReturn(true);
+        when(mWifiPermissionsUtil.doesUidBelongToCurrentUser(user1Network.creatorUid))
+                .thenReturn(false);
         Set<Integer> removedNetworks = mWifiConfigManager.handleUserSwitch(user2);
         verify(mWifiConfigStore).switchUserStoreAndRead(any(WifiConfigStore.StoreFile.class));
         assertTrue((removedNetworks.size() == 1) && (removedNetworks.contains(user1NetworkId)));
@@ -2228,7 +2231,7 @@ public class WifiConfigManagerTest {
     public void testHandleUserSwitchPushesOtherPrivateNetworksToSharedStore() throws Exception {
         int user1 = TEST_DEFAULT_USER;
         int user2 = TEST_DEFAULT_USER + 1;
-        setupUserProfiles(user2);
+        setupUserProfiles(user1);
 
         int appId = 674;
 
@@ -2261,6 +2264,8 @@ public class WifiConfigManagerTest {
             }
         };
         setupStoreDataForUserRead(userNetworks, new HashSet<String>());
+        when(mWifiPermissionsUtil.doesUidBelongToCurrentUser(user2Network.creatorUid))
+                .thenReturn(false);
         mWifiConfigManager.handleUserUnlock(user1);
         verify(mWifiConfigStore).switchUserStoreAndRead(any(WifiConfigStore.StoreFile.class));
         // Capture the written data for the user 1 and ensure that it corresponds to what was
@@ -2275,6 +2280,10 @@ public class WifiConfigManagerTest {
         // Now switch the user to user2 and ensure that user 2's private network has been moved to
         // the user store.
         when(mUserManager.isUserUnlockingOrUnlocked(user2)).thenReturn(true);
+        when(mWifiPermissionsUtil.doesUidBelongToCurrentUser(user1Network.creatorUid))
+                .thenReturn(true).thenReturn(false);
+        when(mWifiPermissionsUtil.doesUidBelongToCurrentUser(user2Network.creatorUid))
+                .thenReturn(false).thenReturn(true);
         mWifiConfigManager.handleUserSwitch(user2);
         // Set the expected network list before comparing. user1Network should be in shared data.
         // Note: In the real world, user1Network will no longer be visible now because it should
@@ -2340,6 +2349,8 @@ public class WifiConfigManagerTest {
         // Unlock the owner of the legacy Passpoint configuration, verify it is removed from
         // the configured networks (migrated to PasspointManager).
         setupStoreDataForUserRead(new ArrayList<WifiConfiguration>(), new HashSet<String>());
+        when(mWifiPermissionsUtil.doesUidBelongToCurrentUser(passpointConfig.creatorUid))
+                .thenReturn(false);
         mWifiConfigManager.handleUserUnlock(user1);
         verify(mWifiConfigStore).switchUserStoreAndRead(any(WifiConfigStore.StoreFile.class));
         Pair<List<WifiConfiguration>, List<WifiConfiguration>> writtenNetworkList =
@@ -2463,7 +2474,8 @@ public class WifiConfigManagerTest {
 
         // Ensure that we have 2 networks in the database before the stop.
         assertEquals(2, mWifiConfigManager.getConfiguredNetworks().size());
-
+        when(mWifiPermissionsUtil.doesUidBelongToCurrentUser(user1Network.creatorUid))
+                .thenReturn(false);
         mWifiConfigManager.handleUserStop(user1);
 
         // Ensure that we only have 1 shared network in the database after the stop.
@@ -2592,6 +2604,8 @@ public class WifiConfigManagerTest {
 
         int creatorUid = UserHandle.getUid(user2, 674);
 
+        when(mWifiPermissionsUtil.doesUidBelongToCurrentUser(creatorUid)).thenReturn(false);
+
         // Create a network for user2 try adding it. This should be rejected.
         final WifiConfiguration user2Network = WifiConfigurationTestUtil.createPskNetwork();
         NetworkUpdateResult result = addNetworkToWifiConfigManager(user2Network, creatorUid);
diff --git a/tests/wifitests/src/com/android/server/wifi/WifiStateMachineTest.java b/tests/wifitests/src/com/android/server/wifi/WifiStateMachineTest.java
index 69e6070ed..9bdea915c 100644
--- a/tests/wifitests/src/com/android/server/wifi/WifiStateMachineTest.java
+++ b/tests/wifitests/src/com/android/server/wifi/WifiStateMachineTest.java
@@ -1723,13 +1723,13 @@ public class WifiStateMachineTest {
     @Test
     public void syncRemovePasspointConfig() throws Exception {
         String fqdn = "test.com";
-        when(mPasspointManager.removeProvider(fqdn)).thenReturn(true);
+        when(mPasspointManager.removeProvider(anyInt(), eq(fqdn))).thenReturn(true);
         mLooper.startAutoDispatch();
         assertTrue(mWsm.syncRemovePasspointConfig(mWsmAsyncChannel, fqdn));
         mLooper.stopAutoDispatch();
         reset(mPasspointManager);
 
-        when(mPasspointManager.removeProvider(fqdn)).thenReturn(false);
+        when(mPasspointManager.removeProvider(anyInt(), eq(fqdn))).thenReturn(false);
         mLooper.startAutoDispatch();
         assertFalse(mWsm.syncRemovePasspointConfig(mWsmAsyncChannel, fqdn));
         mLooper.stopAutoDispatch();
diff --git a/tests/wifitests/src/com/android/server/wifi/hotspot2/PasspointManagerTest.java b/tests/wifitests/src/com/android/server/wifi/hotspot2/PasspointManagerTest.java
index 01566c203..abe593ce6 100644
--- a/tests/wifitests/src/com/android/server/wifi/hotspot2/PasspointManagerTest.java
+++ b/tests/wifitests/src/com/android/server/wifi/hotspot2/PasspointManagerTest.java
@@ -78,6 +78,7 @@ import com.android.server.wifi.hotspot2.anqp.HSOsuProvidersElement;
 import com.android.server.wifi.hotspot2.anqp.I18Name;
 import com.android.server.wifi.hotspot2.anqp.OsuProviderInfo;
 import com.android.server.wifi.util.ScanResultUtil;
+import com.android.server.wifi.util.WifiPermissionsUtil;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -130,6 +131,7 @@ public class PasspointManagerTest {
     @Mock WifiConfigStore mWifiConfigStore;
     @Mock PasspointConfigStoreData.DataSource mDataSource;
     @Mock WifiMetrics mWifiMetrics;
+    @Mock WifiPermissionsUtil mWifiPermissionsUtil;
     PasspointManager mManager;
 
     /** Sets up test. */
@@ -141,7 +143,8 @@ public class PasspointManagerTest {
                 .thenReturn(mAnqpRequestManager);
         when(mObjectFactory.makeCertificateVerifier()).thenReturn(mCertVerifier);
         mManager = new PasspointManager(mContext, mWifiNative, mWifiKeyStore, mClock,
-                mSimAccessor, mObjectFactory, mWifiConfigManager, mWifiConfigStore, mWifiMetrics);
+                mSimAccessor, mObjectFactory, mWifiConfigManager, mWifiConfigStore, mWifiMetrics,
+                mWifiPermissionsUtil);
         ArgumentCaptor<PasspointEventHandler.Callbacks> callbacks =
                 ArgumentCaptor.forClass(PasspointEventHandler.Callbacks.class);
         verify(mObjectFactory).makePasspointEventHandler(any(WifiNative.class),
@@ -472,7 +475,7 @@ public class PasspointManagerTest {
         assertEquals(1, mDataSource.getProviderIndex());
 
         // Remove the provider.
-        assertTrue(mManager.removeProvider(TEST_FQDN));
+        assertTrue(mManager.removeProvider(TEST_CREATOR_UID, TEST_FQDN));
         verify(provider).uninstallCertsAndKeys();
         verify(mWifiConfigManager).saveToStore(true);
         verify(mWifiMetrics).incrementNumPasspointProviderUninstallation();
@@ -512,7 +515,7 @@ public class PasspointManagerTest {
         assertEquals(1, mDataSource.getProviderIndex());
 
         // Remove the provider.
-        assertTrue(mManager.removeProvider(TEST_FQDN));
+        assertTrue(mManager.removeProvider(TEST_CREATOR_UID, TEST_FQDN));
         verify(provider).uninstallCertsAndKeys();
         verify(mWifiConfigManager).saveToStore(true);
         verify(mWifiMetrics).incrementNumPasspointProviderUninstallation();
@@ -632,7 +635,7 @@ public class PasspointManagerTest {
      */
     @Test
     public void removeNonExistingProvider() throws Exception {
-        assertFalse(mManager.removeProvider(TEST_FQDN));
+        assertFalse(mManager.removeProvider(TEST_CREATOR_UID, TEST_FQDN));
         verify(mWifiMetrics).incrementNumPasspointProviderUninstallation();
         verify(mWifiMetrics, never()).incrementNumPasspointProviderUninstallSuccess();
     }