| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.android.internal.telephony; |
| |
| import static android.content.pm.PackageManager.PERMISSION_GRANTED; |
| |
| import android.Manifest; |
| import android.app.AppOpsManager; |
| import android.app.admin.DevicePolicyManager; |
| import android.content.Context; |
| import android.content.pm.ApplicationInfo; |
| import android.content.pm.PackageManager; |
| import android.os.Binder; |
| import android.os.Build; |
| import android.os.Process; |
| import android.os.RemoteException; |
| import android.os.ServiceManager; |
| import android.os.UserHandle; |
| import android.provider.DeviceConfig; |
| import android.provider.Settings; |
| import android.telephony.Rlog; |
| import android.telephony.SubscriptionManager; |
| import android.telephony.TelephonyManager; |
| import android.util.Log; |
| import android.util.StatsLog; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.function.Supplier; |
| |
| /** Utility class for Telephony permission enforcement. */ |
| public final class TelephonyPermissions { |
| private static final String LOG_TAG = "TelephonyPermissions"; |
| |
| private static final boolean DBG = false; |
| |
| private static final Supplier<ITelephony> TELEPHONY_SUPPLIER = () -> |
| ITelephony.Stub.asInterface(ServiceManager.getService(Context.TELEPHONY_SERVICE)); |
| |
| // Contains a mapping of packages that did not meet the new requirements to access device |
| // identifiers and the methods they were attempting to invoke; used to prevent duplicate |
| // reporting of packages / methods. |
| private static final Map<String, Set<String>> sReportedDeviceIDPackages; |
| static { |
| sReportedDeviceIDPackages = new HashMap<>(); |
| } |
| |
| private TelephonyPermissions() {} |
| |
| /** |
| * Check whether the caller (or self, if not processing an IPC) can read phone state. |
| * |
| * <p>This method behaves in one of the following ways: |
| * <ul> |
| * <li>return true: if the caller has the READ_PRIVILEGED_PHONE_STATE permission, the |
| * READ_PHONE_STATE runtime permission, or carrier privileges on the given subId. |
| * <li>throw SecurityException: if the caller didn't declare any of these permissions, or, for |
| * apps which support runtime permissions, if the caller does not currently have any of |
| * these permissions. |
| * <li>return false: if the caller lacks all of these permissions and doesn't support runtime |
| * permissions. This implies that the user revoked the ability to read phone state |
| * manually (via AppOps). In this case we can't throw as it would break app compatibility, |
| * so we return false to indicate that the calling function should return dummy data. |
| * </ul> |
| * |
| * <p>Note: for simplicity, this method always returns false for callers using legacy |
| * permissions and who have had READ_PHONE_STATE revoked, even if they are carrier-privileged. |
| * Such apps should migrate to runtime permissions or stop requiring READ_PHONE_STATE on P+ |
| * devices. |
| * |
| * @param subId the subId of the relevant subscription; used to check carrier privileges. May be |
| * {@link SubscriptionManager#INVALID_SUBSCRIPTION_ID} to skip this check for cases |
| * where it isn't relevant (hidden APIs, or APIs which are otherwise okay to leave |
| * inaccesible to carrier-privileged apps). |
| */ |
| public static boolean checkCallingOrSelfReadPhoneState( |
| Context context, int subId, String callingPackage, String message) { |
| return checkReadPhoneState(context, subId, Binder.getCallingPid(), Binder.getCallingUid(), |
| callingPackage, message); |
| } |
| |
| /** |
| * Check whether the app with the given pid/uid can read phone state. |
| * |
| * <p>This method behaves in one of the following ways: |
| * <ul> |
| * <li>return true: if the caller has the READ_PRIVILEGED_PHONE_STATE permission, the |
| * READ_PHONE_STATE runtime permission, or carrier privileges on the given subId. |
| * <li>throw SecurityException: if the caller didn't declare any of these permissions, or, for |
| * apps which support runtime permissions, if the caller does not currently have any of |
| * these permissions. |
| * <li>return false: if the caller lacks all of these permissions and doesn't support runtime |
| * permissions. This implies that the user revoked the ability to read phone state |
| * manually (via AppOps). In this case we can't throw as it would break app compatibility, |
| * so we return false to indicate that the calling function should return dummy data. |
| * </ul> |
| * |
| * <p>Note: for simplicity, this method always returns false for callers using legacy |
| * permissions and who have had READ_PHONE_STATE revoked, even if they are carrier-privileged. |
| * Such apps should migrate to runtime permissions or stop requiring READ_PHONE_STATE on P+ |
| * devices. |
| */ |
| public static boolean checkReadPhoneState( |
| Context context, int subId, int pid, int uid, String callingPackage, String message) { |
| return checkReadPhoneState( |
| context, TELEPHONY_SUPPLIER, subId, pid, uid, callingPackage, message); |
| } |
| |
| @VisibleForTesting |
| public static boolean checkReadPhoneState( |
| Context context, Supplier<ITelephony> telephonySupplier, int subId, int pid, int uid, |
| String callingPackage, String message) { |
| try { |
| context.enforcePermission( |
| android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE, pid, uid, message); |
| |
| // SKIP checking for run-time permission since caller has PRIVILEGED permission |
| return true; |
| } catch (SecurityException privilegedPhoneStateException) { |
| try { |
| context.enforcePermission( |
| android.Manifest.permission.READ_PHONE_STATE, pid, uid, message); |
| } catch (SecurityException phoneStateException) { |
| // If we don't have the runtime permission, but do have carrier privileges, that |
| // suffices for reading phone state. |
| if (SubscriptionManager.isValidSubscriptionId(subId)) { |
| enforceCarrierPrivilege(telephonySupplier, subId, uid, message); |
| return true; |
| } |
| throw phoneStateException; |
| } |
| } |
| |
| // We have READ_PHONE_STATE permission, so return true as long as the AppOps bit hasn't been |
| // revoked. |
| AppOpsManager appOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE); |
| return appOps.noteOp(AppOpsManager.OP_READ_PHONE_STATE, uid, callingPackage) == |
| AppOpsManager.MODE_ALLOWED; |
| } |
| |
| /** |
| * Check whether the caller (or self, if not processing an IPC) can read device identifiers. |
| * |
| * <p>This method behaves in one of the following ways: |
| * <ul> |
| * <li>return true: if the caller has the READ_PRIVILEGED_PHONE_STATE permission or the |
| * calling package passes a DevicePolicyManager Device Owner / Profile Owner device |
| * identifier access check, |
| * <li>throw SecurityException: if the caller does not meet any of the requirements and is |
| * targeting Q or is targeting pre-Q and does not have the READ_PHONE_STATE permission. |
| * <li>return false: if the caller is targeting pre-Q and does have the READ_PHONE_STATE |
| * permission. In this case the caller would expect to have access to the device |
| * identifiers so false is returned instead of throwing a SecurityException to indicate |
| * the calling function should return dummy data. |
| * </ul> |
| */ |
| public static boolean checkCallingOrSelfReadDeviceIdentifiers(Context context, |
| String callingPackage, String message) { |
| return checkCallingOrSelfReadDeviceIdentifiers(context, |
| SubscriptionManager.INVALID_SUBSCRIPTION_ID, callingPackage, message); |
| } |
| |
| /** |
| * Check whether the caller (or self, if not processing an IPC) can read device identifiers. |
| * |
| * <p>This method behaves in one of the following ways: |
| * <ul> |
| * <li>return true: if the caller has the READ_PRIVILEGED_PHONE_STATE permission or the |
| * calling package passes a DevicePolicyManager Device Owner / Profile Owner device |
| * identifier access check, |
| * <li>throw SecurityException: if the caller does not meet any of the requirements and is |
| * targeting Q or is targeting pre-Q and does not have the READ_PHONE_STATE permission |
| * or carrier privileges. |
| * <li>return false: if the caller is targeting pre-Q and does have the READ_PHONE_STATE |
| * permission or carrier privileges. In this case the caller would expect to have access |
| * to the device identifiers so false is returned instead of throwing a SecurityException |
| * to indicate the calling function should return dummy data. |
| * </ul> |
| */ |
| public static boolean checkCallingOrSelfReadDeviceIdentifiers(Context context, int subId, |
| String callingPackage, String message) { |
| int pid = Binder.getCallingPid(); |
| int uid = Binder.getCallingUid(); |
| // if the device identifier check completes successfully then grant access. |
| if (checkReadDeviceIdentifiers(context, pid, uid, callingPackage)) { |
| return true; |
| } |
| // Calling packages with carrier privileges will also have access to device identifiers, but |
| // this may be removed in a future release. |
| if (SubscriptionManager.isValidSubscriptionId(subId) && getCarrierPrivilegeStatus( |
| TELEPHONY_SUPPLIER, subId, uid) |
| == TelephonyManager.CARRIER_PRIVILEGE_STATUS_HAS_ACCESS) { |
| return true; |
| } |
| // else the calling package is not authorized to access the device identifiers; call |
| // a central method to report the failure based on the target SDK and if the calling package |
| // has the READ_PHONE_STATE permission or carrier privileges that were previously required |
| // to access the identifiers. |
| return reportAccessDeniedToReadIdentifiers(context, subId, pid, uid, callingPackage, |
| message); |
| } |
| |
| /** |
| * Check whether the caller (or self, if not processing an IPC) can read subscriber identifiers. |
| * |
| * <p>This method behaves in one of the following ways: |
| * <ul> |
| * <li>return true: if the caller has the READ_PRIVILEGED_PHONE_STATE permission, the calling |
| * package passes a DevicePolicyManager Device Owner / Profile Owner device identifier |
| * access check, or the calling package has carrier privleges. |
| * <li>throw SecurityException: if the caller does not meet any of the requirements and is |
| * targeting Q or is targeting pre-Q and does not have the READ_PHONE_STATE permission. |
| * <li>return false: if the caller is targeting pre-Q and does have the READ_PHONE_STATE |
| * permission. In this case the caller would expect to have access to the device |
| * identifiers so false is returned instead of throwing a SecurityException to indicate |
| * the calling function should return dummy data. |
| * </ul> |
| */ |
| public static boolean checkCallingOrSelfReadSubscriberIdentifiers(Context context, int subId, |
| String callingPackage, String message) { |
| int pid = Binder.getCallingPid(); |
| int uid = Binder.getCallingUid(); |
| // if the device identifiers can be read then grant access to the subscriber identifiers |
| if (checkReadDeviceIdentifiers(context, pid, uid, callingPackage)) { |
| return true; |
| } |
| // If the calling package has carrier privileges then allow access to the subscriber |
| // identifiers. |
| if (SubscriptionManager.isValidSubscriptionId(subId) && getCarrierPrivilegeStatus( |
| TELEPHONY_SUPPLIER, subId, uid) |
| == TelephonyManager.CARRIER_PRIVILEGE_STATUS_HAS_ACCESS) { |
| return true; |
| } |
| return reportAccessDeniedToReadIdentifiers(context, subId, pid, uid, callingPackage, |
| message); |
| } |
| |
| /** |
| * Checks whether the app with the given pid/uid can read device identifiers. |
| * |
| * @returns true if the caller has the READ_PRIVILEGED_PHONE_STATE permission or the calling |
| * package passes a DevicePolicyManager Device Owner / Profile Owner device identifier access |
| * check. |
| */ |
| private static boolean checkReadDeviceIdentifiers(Context context, int pid, int uid, |
| String callingPackage) { |
| // Allow system and root access to the device identifiers. |
| final int appId = UserHandle.getAppId(uid); |
| if (appId == Process.SYSTEM_UID || appId == Process.ROOT_UID) { |
| return true; |
| } |
| // Allow access to packages that have the READ_PRIVILEGED_PHONE_STATE permission. |
| if (context.checkPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE, pid, |
| uid) == PackageManager.PERMISSION_GRANTED) { |
| return true; |
| } |
| // if the calling package is null then return now as there's no way to perform the |
| // DevicePolicyManager device / profile owner checks. |
| if (callingPackage == null) { |
| return false; |
| } |
| // Allow access to a device / profile owner app. |
| DevicePolicyManager devicePolicyManager = (DevicePolicyManager) context.getSystemService( |
| Context.DEVICE_POLICY_SERVICE); |
| if (devicePolicyManager != null && devicePolicyManager.checkDeviceIdentifierAccessAsUser( |
| callingPackage, Binder.getCallingUserHandle().getIdentifier())) { |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Reports a failure when the app with the given pid/uid cannot access the requested identifier. |
| * |
| * @returns false if the caller is targeting pre-Q and does have the READ_PHONE_STATE |
| * permission or carrier privileges. |
| * @throws SecurityException if the caller does not meet any of the requirements for the |
| * requested identifier and is targeting Q or is targeting pre-Q |
| * and does not have the READ_PHONE_STATE permission or carrier |
| * privileges. |
| */ |
| private static boolean reportAccessDeniedToReadIdentifiers(Context context, int subId, int pid, |
| int uid, String callingPackage, String message) { |
| // Check if the application is not preinstalled; if not then a separate setting is required |
| // to relax the check to begin flagging problems with non-preinstalled apps early. |
| boolean relax3PDeviceIdentifierCheck = Settings.Global.getInt(context.getContentResolver(), |
| Settings.Global.PRIVILEGED_DEVICE_IDENTIFIER_3P_CHECK_RELAXED, 0) == 1; |
| boolean isPreinstalled = false; |
| // Also check if the application is a preloaded non-privileged app; if so there is a |
| // separate setting to relax the check for these apps to ensure users can relax the check |
| // for non-preinstalled or non-priv apps as needed while continuing to test the other. |
| boolean relaxNonPrivDeviceIdentifierCheck = Settings.Global.getInt( |
| context.getContentResolver(), |
| Settings.Global.PRIVILEGED_DEVICE_IDENTIFIER_NON_PRIV_CHECK_RELAXED, 0) == 1; |
| boolean isPrivApp = false; |
| // Similar to above support relaxing the check for privileged apps while still enforcing it |
| // for non-privileged and non-preinstalled apps. |
| boolean relaxPrivDeviceIdentifierCheck = Settings.Global.getInt( |
| context.getContentResolver(), |
| Settings.Global.PRIVILEGED_DEVICE_IDENTIFIER_PRIV_CHECK_RELAXED, 0) == 1; |
| ApplicationInfo callingPackageInfo = null; |
| try { |
| callingPackageInfo = context.getPackageManager().getApplicationInfo(callingPackage, 0); |
| if (callingPackageInfo.isSystemApp()) { |
| isPreinstalled = true; |
| if (callingPackageInfo.isPrivilegedApp()) { |
| isPrivApp = true; |
| } |
| } |
| } catch (PackageManager.NameNotFoundException e) { |
| // If the application info for the calling package could not be found then assume the |
| // calling app is a non-preinstalled app to detect any issues with the check |
| Log.e(LOG_TAG, "Exception caught obtaining package info for package " + callingPackage, |
| e); |
| } |
| // The new Q restrictions for device identifier access will be enforced for all apps with |
| // settings to individually disable the new restrictions for privileged, preloaded |
| // non-privileged, and non-preinstalled apps. |
| if (!isIdentifierCheckDisabled() && ( |
| (!isPreinstalled && !relax3PDeviceIdentifierCheck) |
| || (isPreinstalled && !isPrivApp && !relaxNonPrivDeviceIdentifierCheck))) { |
| // The current package should only be reported in StatsLog if it has not previously been |
| // reported for the currently invoked device identifier method. |
| boolean packageReported = sReportedDeviceIDPackages.containsKey(callingPackage); |
| if (!packageReported || !sReportedDeviceIDPackages.get(callingPackage).contains( |
| message)) { |
| Set invokedMethods; |
| if (!packageReported) { |
| invokedMethods = new HashSet<String>(); |
| sReportedDeviceIDPackages.put(callingPackage, invokedMethods); |
| } else { |
| invokedMethods = sReportedDeviceIDPackages.get(callingPackage); |
| } |
| invokedMethods.add(message); |
| StatsLog.write(StatsLog.DEVICE_IDENTIFIER_ACCESS_DENIED, callingPackage, message, |
| isPreinstalled, isPrivApp); |
| } |
| Log.w(LOG_TAG, "reportAccessDeniedToReadIdentifiers:" + callingPackage + ":" + message |
| + ":isPreinstalled=" + isPreinstalled + ":isPrivApp=" + isPrivApp); |
| // if the target SDK is pre-Q then check if the calling package would have previously |
| // had access to device identifiers. |
| if (callingPackageInfo != null && ( |
| callingPackageInfo.targetSdkVersion < Build.VERSION_CODES.Q)) { |
| if (context.checkPermission( |
| android.Manifest.permission.READ_PHONE_STATE, |
| pid, |
| uid) == PackageManager.PERMISSION_GRANTED) { |
| return false; |
| } |
| if (SubscriptionManager.isValidSubscriptionId(subId) |
| && getCarrierPrivilegeStatus(TELEPHONY_SUPPLIER, subId, uid) |
| == TelephonyManager.CARRIER_PRIVILEGE_STATUS_HAS_ACCESS) { |
| return false; |
| } |
| } |
| throw new SecurityException(message + ": The user " + uid |
| + " does not meet the requirements to access device identifiers."); |
| } else { |
| return checkReadPhoneState(context, subId, pid, uid, callingPackage, message); |
| } |
| } |
| |
| /** |
| * Returns true if the new device identifier access restrictions are disabled. |
| */ |
| private static boolean isIdentifierCheckDisabled() { |
| return Boolean.parseBoolean(DeviceConfig.getProperty(DeviceConfig.Privacy.NAMESPACE, |
| DeviceConfig.Privacy.PROPERTY_DEVICE_IDENTIFIER_ACCESS_RESTRICTIONS_DISABLED)); |
| } |
| |
| /** |
| * Check whether the app with the given pid/uid can read the call log. |
| * @return {@code true} if the specified app has the read call log permission and AppOpp granted |
| * to it, {@code false} otherwise. |
| */ |
| public static boolean checkReadCallLog( |
| Context context, int subId, int pid, int uid, String callingPackage) { |
| return checkReadCallLog( |
| context, TELEPHONY_SUPPLIER, subId, pid, uid, callingPackage); |
| } |
| |
| @VisibleForTesting |
| public static boolean checkReadCallLog( |
| Context context, Supplier<ITelephony> telephonySupplier, int subId, int pid, int uid, |
| String callingPackage) { |
| |
| if (context.checkPermission(Manifest.permission.READ_CALL_LOG, pid, uid) |
| != PERMISSION_GRANTED) { |
| // If we don't have the runtime permission, but do have carrier privileges, that |
| // suffices for being able to see the call phone numbers. |
| if (SubscriptionManager.isValidSubscriptionId(subId)) { |
| enforceCarrierPrivilege(telephonySupplier, subId, uid, "readCallLog"); |
| return true; |
| } |
| return false; |
| } |
| |
| // We have READ_CALL_LOG permission, so return true as long as the AppOps bit hasn't been |
| // revoked. |
| AppOpsManager appOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE); |
| return appOps.noteOp(AppOpsManager.OP_READ_CALL_LOG, uid, callingPackage) == |
| AppOpsManager.MODE_ALLOWED; |
| } |
| |
| /** |
| * Returns whether the caller can read phone numbers. |
| * |
| * <p>Besides apps with the ability to read phone state per {@link #checkReadPhoneState}, the |
| * default SMS app and apps with READ_SMS or READ_PHONE_NUMBERS can also read phone numbers. |
| */ |
| public static boolean checkCallingOrSelfReadPhoneNumber( |
| Context context, int subId, String callingPackage, String message) { |
| return checkReadPhoneNumber( |
| context, TELEPHONY_SUPPLIER, subId, Binder.getCallingPid(), Binder.getCallingUid(), |
| callingPackage, message); |
| } |
| |
| @VisibleForTesting |
| public static boolean checkReadPhoneNumber( |
| Context context, Supplier<ITelephony> telephonySupplier, int subId, int pid, int uid, |
| String callingPackage, String message) { |
| // Default SMS app can always read it. |
| AppOpsManager appOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE); |
| if (appOps.noteOp(AppOpsManager.OP_WRITE_SMS, uid, callingPackage) == |
| AppOpsManager.MODE_ALLOWED) { |
| return true; |
| } |
| |
| // NOTE(b/73308711): If an app has one of the following AppOps bits explicitly revoked, they |
| // will be denied access, even if they have another permission and AppOps bit if needed. |
| |
| // First, check if we can read the phone state. |
| try { |
| return checkReadPhoneState( |
| context, telephonySupplier, subId, pid, uid, callingPackage, message); |
| } catch (SecurityException readPhoneStateSecurityException) { |
| } |
| // Can be read with READ_SMS too. |
| try { |
| context.enforcePermission(android.Manifest.permission.READ_SMS, pid, uid, message); |
| int opCode = AppOpsManager.permissionToOpCode(android.Manifest.permission.READ_SMS); |
| if (opCode != AppOpsManager.OP_NONE) { |
| return appOps.noteOp(opCode, uid, callingPackage) == AppOpsManager.MODE_ALLOWED; |
| } else { |
| return true; |
| } |
| } catch (SecurityException readSmsSecurityException) { |
| } |
| // Can be read with READ_PHONE_NUMBERS too. |
| try { |
| context.enforcePermission(android.Manifest.permission.READ_PHONE_NUMBERS, pid, uid, |
| message); |
| int opCode = AppOpsManager.permissionToOpCode( |
| android.Manifest.permission.READ_PHONE_NUMBERS); |
| if (opCode != AppOpsManager.OP_NONE) { |
| return appOps.noteOp(opCode, uid, callingPackage) == AppOpsManager.MODE_ALLOWED; |
| } else { |
| return true; |
| } |
| } catch (SecurityException readPhoneNumberSecurityException) { |
| } |
| |
| throw new SecurityException(message + ": Neither user " + uid + |
| " nor current process has " + android.Manifest.permission.READ_PHONE_STATE + |
| ", " + android.Manifest.permission.READ_SMS + ", or " + |
| android.Manifest.permission.READ_PHONE_NUMBERS); |
| } |
| |
| /** |
| * Ensure the caller (or self, if not processing an IPC) has MODIFY_PHONE_STATE (and is thus a |
| * privileged app) or carrier privileges. |
| * |
| * @throws SecurityException if the caller does not have the required permission/privileges |
| */ |
| public static void enforceCallingOrSelfModifyPermissionOrCarrierPrivilege( |
| Context context, int subId, String message) { |
| if (context.checkCallingOrSelfPermission(android.Manifest.permission.MODIFY_PHONE_STATE) == |
| PERMISSION_GRANTED) { |
| return; |
| } |
| |
| if (DBG) Rlog.d(LOG_TAG, "No modify permission, check carrier privilege next."); |
| enforceCallingOrSelfCarrierPrivilege(subId, message); |
| } |
| |
| /** |
| * Ensure the caller (or self, if not processing an IPC) has |
| * {@link android.Manifest.permission#READ_PHONE_STATE} or carrier privileges. |
| * |
| * @throws SecurityException if the caller does not have the required permission/privileges |
| */ |
| public static void enforeceCallingOrSelfReadPhoneStatePermissionOrCarrierPrivilege( |
| Context context, int subId, String message) { |
| if (context.checkCallingOrSelfPermission(android.Manifest.permission.READ_PHONE_STATE) |
| == PERMISSION_GRANTED) { |
| return; |
| } |
| |
| if (DBG) { |
| Rlog.d(LOG_TAG, "No READ_PHONE_STATE permission, check carrier privilege next."); |
| } |
| |
| enforceCallingOrSelfCarrierPrivilege(subId, message); |
| } |
| |
| /** |
| * Ensure the caller (or self, if not processing an IPC) has |
| * {@link android.Manifest.permission#READ_PRIVILEGED_PHONE_STATE} or carrier privileges. |
| * |
| * @throws SecurityException if the caller does not have the required permission/privileges |
| */ |
| public static void enforeceCallingOrSelfReadPrivilegedPhoneStatePermissionOrCarrierPrivilege( |
| Context context, int subId, String message) { |
| if (context.checkCallingOrSelfPermission(Manifest.permission.READ_PRIVILEGED_PHONE_STATE) |
| == PERMISSION_GRANTED) { |
| return; |
| } |
| |
| if (DBG) { |
| Rlog.d(LOG_TAG, "No READ_PRIVILEDED_PHONE_STATE permission, " + |
| "check carrier privilege next."); |
| } |
| |
| enforceCallingOrSelfCarrierPrivilege(subId, message); |
| } |
| |
| /** |
| * Make sure the caller (or self, if not processing an IPC) has carrier privileges. |
| * |
| * @throws SecurityException if the caller does not have the required privileges |
| */ |
| public static void enforceCallingOrSelfCarrierPrivilege(int subId, String message) { |
| // NOTE: It's critical that we explicitly pass the calling UID here rather than call |
| // TelephonyManager#hasCarrierPrivileges directly, as the latter only works when called from |
| // the phone process. When called from another process, it will check whether that process |
| // has carrier privileges instead. |
| enforceCarrierPrivilege(subId, Binder.getCallingUid(), message); |
| } |
| |
| private static void enforceCarrierPrivilege(int subId, int uid, String message) { |
| enforceCarrierPrivilege(TELEPHONY_SUPPLIER, subId, uid, message); |
| } |
| |
| private static void enforceCarrierPrivilege( |
| Supplier<ITelephony> telephonySupplier, int subId, int uid, String message) { |
| if (getCarrierPrivilegeStatus(telephonySupplier, subId, uid) != |
| TelephonyManager.CARRIER_PRIVILEGE_STATUS_HAS_ACCESS) { |
| if (DBG) Rlog.e(LOG_TAG, "No Carrier Privilege."); |
| throw new SecurityException(message); |
| } |
| } |
| |
| private static int getCarrierPrivilegeStatus( |
| Supplier<ITelephony> telephonySupplier, int subId, int uid) { |
| ITelephony telephony = telephonySupplier.get(); |
| try { |
| if (telephony != null) { |
| return telephony.getCarrierPrivilegeStatusForUid(subId, uid); |
| } |
| } catch (RemoteException e) { |
| // Fallback below. |
| } |
| Rlog.e(LOG_TAG, "Phone process is down, cannot check carrier privileges"); |
| return TelephonyManager.CARRIER_PRIVILEGE_STATUS_NO_ACCESS; |
| } |
| |
| /** |
| * Throws if the caller is not of a shell (or root) UID. |
| * |
| * @param callingUid pass Binder.callingUid(). |
| */ |
| public static void enforceShellOnly(int callingUid, String message) { |
| if (callingUid == Process.SHELL_UID || callingUid == Process.ROOT_UID) { |
| return; // okay |
| } |
| |
| throw new SecurityException(message + ": Only shell user can call it"); |
| } |
| } |