[Suggestion] Check foreground user for API callHEADq10.0

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)
(cherry picked from commit 95673e85133c78773870fb5161bb300b7f2ee51e)

1 files changed, 29 insertions, 0 deletions

diff --git a/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java b/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java
index b1ceaf37a..ca93b71c0 100644
--- a/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java
+++ b/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java
@@ -29,6 +29,7 @@ import android.os.RemoteException;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.util.Slog;
+import android.util.EventLog;
 
 import com.android.internal.annotations.GuardedBy;
 import com.android.server.wifi.WifiInjector;
@@ -517,4 +518,32 @@ public class WifiPermissionsUtil {
         }
         return mode == AppOpsManager.MODE_ALLOWED;
     }
+
+    /**
+     * 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;
+    }
 }