Move getUserSwitchability from UserManager to UserManagerService.

UserManager.getUserSwitchability was calling telecomManager.isInCall
method to see whether there is an ongoing phone call. Since the call
was made from client side, it was causing a SecurityException when
switcing users via adb command and breaking CtsMultiUserHostTestCases
tests. This CL moves all the logic from UserManager to
UserManagerService, and calls telecomManager.isInCall() with
Binder.clearCallingIdentity.

Bug: 257538981
Bug: 261505371
Fixes: 260184263
Test: atest CtsMultiUserHostTestCases
Merged-In: Idfca1fcb89688d08878b908ceed9c64f1e7091d3
Change-Id: Idfca1fcb89688d08878b908ceed9c64f1e7091d3
(cherry picked from commit 2f17ef912ee8cc321d54b08acb119d1ad641b756)
(cherry picked from commit e2062736eced6afdaa40b557f8c32461ae896020)
Merged-In: Idfca1fcb89688d08878b908ceed9c64f1e7091d3

3 files changed, 72 insertions, 43 deletions

diff --git a/core/java/android/os/IUserManager.aidl b/core/java/android/os/IUserManager.aidl
index e1d15defad38..125bdaf07b90 100644
--- a/core/java/android/os/IUserManager.aidl
+++ b/core/java/android/os/IUserManager.aidl
@@ -74,6 +74,7 @@ interface IUserManager {
     String getUserAccount(int userId);
     void setUserAccount(int userId, String accountName);
     long getUserCreationTime(int userId);
+    int getUserSwitchability(int userId);
     boolean isUserSwitcherEnabled(int mUserId);
     boolean isRestricted(int userId);
     boolean canHaveRestrictedProfile(int userId);
diff --git a/core/java/android/os/UserManager.java b/core/java/android/os/UserManager.java
index 5487a1203833..46fff2bfc922 100644
--- a/core/java/android/os/UserManager.java
+++ b/core/java/android/os/UserManager.java
@@ -58,7 +58,6 @@ import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.location.LocationManager;
 import android.provider.Settings;
-import android.telephony.TelephonyManager;
 import android.util.AndroidException;
 import android.util.ArraySet;
 import android.util.Log;
@@ -1670,7 +1669,7 @@ public class UserManager {
     public static final int SWITCHABILITY_STATUS_SYSTEM_USER_LOCKED = 1 << 2;
 
     /**
-     * Result returned in {@link #getUserSwitchability()} indicating user swichability.
+     * Result returned in {@link #getUserSwitchability()} indicating user switchability.
      * @hide
      */
     @Retention(RetentionPolicy.SOURCE)
@@ -2037,25 +2036,16 @@ public class UserManager {
      * @hide
      */
     @Deprecated
-    @RequiresPermission(allOf = {
-            Manifest.permission.READ_PHONE_STATE,
-            Manifest.permission.MANAGE_USERS}, // Can be INTERACT_ACROSS_USERS instead.
-            conditional = true)
+    @RequiresPermission(anyOf = {android.Manifest.permission.MANAGE_USERS,
+            android.Manifest.permission.INTERACT_ACROSS_USERS})
     @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     @UserHandleAware
     public boolean canSwitchUsers() {
-        boolean allowUserSwitchingWhenSystemUserLocked = Settings.Global.getInt(
-                mContext.getContentResolver(),
-                Settings.Global.ALLOW_USER_SWITCHING_WHEN_SYSTEM_USER_LOCKED, 0) != 0;
-        boolean isSystemUserUnlocked = isUserUnlocked(UserHandle.SYSTEM);
-        boolean inCall = false;
-        TelephonyManager telephonyManager = mContext.getSystemService(TelephonyManager.class);
-        if (telephonyManager != null) {
-            inCall = telephonyManager.getCallState() != TelephonyManager.CALL_STATE_IDLE;
+        try {
+            return mService.getUserSwitchability(mUserId) == SWITCHABILITY_STATUS_OK;
+        } catch (RemoteException re) {
+            throw re.rethrowFromSystemServer();
         }
-        boolean isUserSwitchDisallowed = hasUserRestrictionForUser(DISALLOW_USER_SWITCH, mUserId);
-        return (allowUserSwitchingWhenSystemUserLocked || isSystemUserUnlocked) && !inCall
-                && !isUserSwitchDisallowed;
     }
 
     /**
@@ -2089,34 +2079,14 @@ public class UserManager {
      * @return A {@link UserSwitchabilityResult} flag indicating if the user is switchable.
      * @hide
      */
-    @RequiresPermission(allOf = {Manifest.permission.READ_PHONE_STATE,
-            android.Manifest.permission.MANAGE_USERS,
-            android.Manifest.permission.INTERACT_ACROSS_USERS}, conditional = true)
+    @RequiresPermission(anyOf = {android.Manifest.permission.MANAGE_USERS,
+            android.Manifest.permission.INTERACT_ACROSS_USERS})
     public @UserSwitchabilityResult int getUserSwitchability(UserHandle userHandle) {
-        final TelephonyManager tm =
-                (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);
-
-        int flags = SWITCHABILITY_STATUS_OK;
-        if (tm.getCallState() != TelephonyManager.CALL_STATE_IDLE) {
-            flags |= SWITCHABILITY_STATUS_USER_IN_CALL;
-        }
-        if (hasUserRestrictionForUser(DISALLOW_USER_SWITCH, userHandle)) {
-            flags |= SWITCHABILITY_STATUS_USER_SWITCH_DISALLOWED;
-        }
-
-        // System User is always unlocked in Headless System User Mode, so ignore this flag
-        if (!isHeadlessSystemUserMode()) {
-            final boolean allowUserSwitchingWhenSystemUserLocked = Settings.Global.getInt(
-                    mContext.getContentResolver(),
-                    Settings.Global.ALLOW_USER_SWITCHING_WHEN_SYSTEM_USER_LOCKED, 0) != 0;
-            final boolean systemUserUnlocked = isUserUnlocked(UserHandle.SYSTEM);
-
-            if (!allowUserSwitchingWhenSystemUserLocked && !systemUserUnlocked) {
-                flags |= SWITCHABILITY_STATUS_SYSTEM_USER_LOCKED;
-            }
+        try {
+            return mService.getUserSwitchability(userHandle.getIdentifier());
+        } catch (RemoteException re) {
+            throw re.rethrowFromSystemServer();
         }
-
-        return flags;
     }
 
     /**
diff --git a/services/core/java/com/android/server/pm/UserManagerService.java b/services/core/java/com/android/server/pm/UserManagerService.java
index 00fb0651adc4..866a995585cd 100644
--- a/services/core/java/com/android/server/pm/UserManagerService.java
+++ b/services/core/java/com/android/server/pm/UserManagerService.java
@@ -91,6 +91,7 @@ import android.security.GateKeeper;
 import android.service.gatekeeper.IGateKeeperService;
 import android.service.voice.VoiceInteractionManagerInternal;
 import android.stats.devicepolicy.DevicePolicyEnums;
+import android.telecom.TelecomManager;
 import android.text.TextUtils;
 import android.util.ArrayMap;
 import android.util.ArraySet;
@@ -1760,6 +1761,63 @@ public class UserManagerService extends IUserManager.Stub {
         }
     }
 
+    /**
+     * Returns whether switching users is currently allowed for the provided user.
+     * <p>
+     * Switching users is not allowed in the following cases:
+     * <li>the user is in a phone call</li>
+     * <li>{@link UserManager#DISALLOW_USER_SWITCH} is set</li>
+     * <li>system user hasn't been unlocked yet</li>
+     *
+     * @return A {@link UserManager.UserSwitchabilityResult} flag indicating if the user is
+     * switchable.
+     */
+    public @UserManager.UserSwitchabilityResult int getUserSwitchability(int userId) {
+        checkManageOrInteractPermissionIfCallerInOtherProfileGroup(userId, "getUserSwitchability");
+
+        final TimingsTraceAndSlog t = new TimingsTraceAndSlog();
+        t.traceBegin("getUserSwitchability-" + userId);
+
+        int flags = UserManager.SWITCHABILITY_STATUS_OK;
+
+        t.traceBegin("TM.isInCall");
+        final long identity = Binder.clearCallingIdentity();
+        try {
+            final TelecomManager telecomManager = mContext.getSystemService(TelecomManager.class);
+            if (telecomManager != null && telecomManager.isInCall()) {
+                flags |= UserManager.SWITCHABILITY_STATUS_USER_IN_CALL;
+            }
+        } finally {
+            Binder.restoreCallingIdentity(identity);
+        }
+        t.traceEnd();
+
+        t.traceBegin("hasUserRestriction-DISALLOW_USER_SWITCH");
+        if (mLocalService.hasUserRestriction(DISALLOW_USER_SWITCH, userId)) {
+            flags |= UserManager.SWITCHABILITY_STATUS_USER_SWITCH_DISALLOWED;
+        }
+        t.traceEnd();
+
+        // System User is always unlocked in Headless System User Mode, so ignore this flag
+        if (!UserManager.isHeadlessSystemUserMode()) {
+            t.traceBegin("getInt-ALLOW_USER_SWITCHING_WHEN_SYSTEM_USER_LOCKED");
+            final boolean allowUserSwitchingWhenSystemUserLocked = Settings.Global.getInt(
+                    mContext.getContentResolver(),
+                    Settings.Global.ALLOW_USER_SWITCHING_WHEN_SYSTEM_USER_LOCKED, 0) != 0;
+            t.traceEnd();
+            t.traceBegin("isUserUnlocked-USER_SYSTEM");
+            final boolean systemUserUnlocked = mLocalService.isUserUnlocked(UserHandle.USER_SYSTEM);
+            t.traceEnd();
+
+            if (!allowUserSwitchingWhenSystemUserLocked && !systemUserUnlocked) {
+                flags |= UserManager.SWITCHABILITY_STATUS_SYSTEM_USER_LOCKED;
+            }
+        }
+        t.traceEnd();
+
+        return flags;
+    }
+
     @Override
     public boolean isUserSwitcherEnabled(@UserIdInt int mUserId) {
         boolean multiUserSettingOn = Settings.Global.getInt(mContext.getContentResolver(),