| /* |
| * 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.annotation.Nullable; |
| import android.app.AppOpsManager; |
| 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.UserHandle; |
| import android.permission.PermissionManager; |
| import android.telephony.SubscriptionManager; |
| import android.telephony.TelephonyManager; |
| import android.util.Log; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** Utility class for Telephony permission enforcement. */ |
| public final class TelephonyPermissions { |
| private static final String LOG_TAG = "TelephonyPermissions"; |
| |
| private static final boolean DBG = false; |
| |
| /** |
| * Whether to disable the new device identifier access restrictions. |
| */ |
| private static final String PROPERTY_DEVICE_IDENTIFIER_ACCESS_RESTRICTIONS_DISABLED = |
| "device_identifier_access_restrictions_disabled"; |
| |
| // 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, @Nullable String callingFeatureId, |
| String message) { |
| return checkReadPhoneState(context, subId, Binder.getCallingPid(), Binder.getCallingUid(), |
| callingPackage, callingFeatureId, message); |
| } |
| |
| /** Identical to checkCallingOrSelfReadPhoneState but never throws SecurityException */ |
| public static boolean checkCallingOrSelfReadPhoneStateNoThrow( |
| Context context, int subId, String callingPackage, @Nullable String callingFeatureId, |
| String message) { |
| try { |
| return checkCallingOrSelfReadPhoneState(context, subId, callingPackage, |
| callingFeatureId, message); |
| } catch (SecurityException se) { |
| return false; |
| } |
| } |
| |
| /** |
| * 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, |
| @Nullable String callingFeatureId, 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(context, 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.OPSTR_READ_PHONE_STATE, uid, callingPackage, |
| callingFeatureId, null) == AppOpsManager.MODE_ALLOWED; |
| } |
| |
| /** |
| * Check whether the calling packages has carrier privileges for the passing subscription. |
| * @return {@code true} if the caller has carrier privileges, {@false} otherwise. |
| */ |
| public static boolean checkCarrierPrivilegeForSubId(Context context, int subId) { |
| if (SubscriptionManager.isValidSubscriptionId(subId) |
| && getCarrierPrivilegeStatus(context, subId, Binder.getCallingUid()) |
| == TelephonyManager.CARRIER_PRIVILEGE_STATUS_HAS_ACCESS) { |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Check whether the app with the given pid/uid can read phone state, or has carrier |
| * privileges on any active subscription. |
| * |
| * <p>If the app does not have carrier privilege, this method will return {@code false} instead |
| * of throwing a SecurityException. Therefore, the callers cannot tell the difference |
| * between M+ apps which declare the runtime permission but do not have it, and pre-M apps |
| * which declare the static permission but had access revoked via AppOps. Apps in the former |
| * category expect SecurityExceptions; apps in the latter don't. So this method is suitable for |
| * use only if the behavior in both scenarios is meant to be identical. |
| * |
| * @return {@code true} if the app can read phone state or has carrier privilege; |
| * {@code false} otherwise. |
| */ |
| public static boolean checkReadPhoneStateOnAnyActiveSub(Context context, int pid, int uid, |
| String callingPackage, @Nullable String callingFeatureId, 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. |
| return checkCarrierPrivilegeForAnySubId(context, uid); |
| } |
| } |
| |
| // 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.OPSTR_READ_PHONE_STATE, uid, callingPackage, |
| callingFeatureId, null) == 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, the calling |
| * package passes a DevicePolicyManager Device Owner / Profile Owner device identifier |
| * access check, or the calling package has carrier privileges on any active subscription. |
| * <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 of any active subscription. |
| * <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, @Nullable String callingFeatureId, String message) { |
| return checkCallingOrSelfReadDeviceIdentifiers(context, |
| SubscriptionManager.INVALID_SUBSCRIPTION_ID, callingPackage, callingFeatureId, |
| 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, the calling |
| * package passes a DevicePolicyManager Device Owner / Profile Owner device identifier |
| * access check, or the calling package has carrier privileges on any active subscription. |
| * <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 of any active subscription. |
| * <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, @Nullable String callingFeatureId, String message) { |
| return checkPrivilegedReadPermissionOrCarrierPrivilegePermission( |
| context, subId, callingPackage, callingFeatureId, message, true); |
| } |
| |
| /** |
| * 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 privileges on specified subscription. |
| * <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, @Nullable String callingFeatureId, String message) { |
| return checkPrivilegedReadPermissionOrCarrierPrivilegePermission( |
| context, subId, callingPackage, callingFeatureId, message, false); |
| } |
| |
| /** |
| * Checks whether the app with the given pid/uid 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, the calling |
| * package passes a DevicePolicyManager Device Owner / Profile Owner device identifier |
| * access check; or the calling package has carrier privileges on the specified |
| * subscription; or allowCarrierPrivilegeOnAnySub is true and has carrier privilege on |
| * any active subscription. |
| * <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> |
| */ |
| private static boolean checkPrivilegedReadPermissionOrCarrierPrivilegePermission( |
| Context context, int subId, String callingPackage, @Nullable String callingFeatureId, |
| String message, boolean allowCarrierPrivilegeOnAnySub) { |
| int uid = Binder.getCallingUid(); |
| int pid = Binder.getCallingPid(); |
| PermissionManager permissionManager = (PermissionManager) context.getSystemService( |
| Context.PERMISSION_SERVICE); |
| if (permissionManager.checkDeviceIdentifierAccess(callingPackage, message, callingFeatureId, |
| pid, uid) == PackageManager.PERMISSION_GRANTED) { |
| return true; |
| } |
| |
| // If the calling package has carrier privileges for specified sub, then allow access. |
| if (checkCarrierPrivilegeForSubId(context, subId)) return true; |
| |
| // If the calling package has carrier privileges for any subscription |
| // and allowCarrierPrivilegeOnAnySub is set true, then allow access. |
| if (allowCarrierPrivilegeOnAnySub && checkCarrierPrivilegeForAnySubId(context, uid)) { |
| return true; |
| } |
| |
| return reportAccessDeniedToReadIdentifiers(context, subId, pid, uid, callingPackage, |
| message); |
| } |
| |
| /** |
| * 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) { |
| ApplicationInfo callingPackageInfo = null; |
| try { |
| callingPackageInfo = context.getPackageManager().getApplicationInfoAsUser( |
| callingPackage, 0, UserHandle.getUserHandleForUid(uid)); |
| } 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 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); |
| TelephonyCommonStatsLog.write(TelephonyCommonStatsLog.DEVICE_IDENTIFIER_ACCESS_DENIED, |
| callingPackage, message, /* isPreinstalled= */ false, false); |
| } |
| Log.w(LOG_TAG, "reportAccessDeniedToReadIdentifiers:" + callingPackage + ":" + message + ":" |
| + subId); |
| // 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 (checkCarrierPrivilegeForSubId(context, subId)) { |
| return false; |
| } |
| } |
| throw new SecurityException(message + ": The user " + uid |
| + " does not meet the requirements to access device identifiers."); |
| } |
| |
| /** |
| * 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, |
| @Nullable String callingPackageName) { |
| 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(context, 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.OPSTR_READ_CALL_LOG, uid, callingPackage, |
| callingPackageName, null) == AppOpsManager.MODE_ALLOWED; |
| } |
| |
| /** |
| * Returns whether the caller can read phone numbers. |
| * |
| * <p>Besides apps with the ability to read phone state per {@link #checkReadPhoneState} |
| * (only prior to R), 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, @Nullable String callingFeatureId, |
| String message) { |
| return checkReadPhoneNumber( |
| context, subId, Binder.getCallingPid(), Binder.getCallingUid(), |
| callingPackage, callingFeatureId, message); |
| } |
| |
| /** |
| * Returns whether the caller can read phone numbers. |
| * |
| * <p>Besides apps with the ability to read phone state per {@link #checkReadPhoneState} |
| * (only prior to R), the default SMS app and apps with READ_SMS or READ_PHONE_NUMBERS |
| * can also read phone numbers. |
| */ |
| @VisibleForTesting |
| public static boolean checkReadPhoneNumber( |
| Context context, int subId, int pid, int uid, |
| String callingPackage, @Nullable String callingFeatureId, String message) { |
| // Default SMS app can always read it. |
| AppOpsManager appOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE); |
| if (appOps.noteOp(AppOpsManager.OPSTR_WRITE_SMS, uid, callingPackage, callingFeatureId, |
| null) == 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 the SDK version is below R |
| boolean preR = false; |
| try { |
| ApplicationInfo info = context.getPackageManager().getApplicationInfoAsUser( |
| callingPackage, 0, UserHandle.getUserHandleForUid(Binder.getCallingUid())); |
| preR = info.targetSdkVersion <= Build.VERSION_CODES.Q; |
| } catch (PackageManager.NameNotFoundException nameNotFoundException) { |
| } |
| if (preR) { |
| // SDK < R allows READ_PHONE_STATE, READ_PRIVILEGED_PHONE_STATE, or carrier privilege |
| try { |
| return checkReadPhoneState( |
| context, subId, pid, uid, callingPackage, callingFeatureId, message); |
| } catch (SecurityException readPhoneStateException) { |
| } |
| } else { |
| // SDK >= R allows READ_PRIVILEGED_PHONE_STATE or carrier privilege |
| try { |
| context.enforcePermission( |
| android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE, pid, uid, message); |
| // Skip checking for runtime permission since caller has privileged permission |
| return true; |
| } catch (SecurityException readPrivilegedPhoneStateException) { |
| if (SubscriptionManager.isValidSubscriptionId(subId)) { |
| try { |
| enforceCarrierPrivilege(context, subId, uid, message); |
| // Skip checking for runtime permission since caller has carrier privilege |
| return true; |
| } catch (SecurityException carrierPrivilegeException) { |
| } |
| } |
| } |
| } |
| |
| // Can be read with READ_SMS too. |
| try { |
| context.enforcePermission(android.Manifest.permission.READ_SMS, pid, uid, message); |
| return appOps.noteOp(AppOpsManager.OPSTR_READ_SMS, uid, callingPackage, |
| callingFeatureId, null) == AppOpsManager.MODE_ALLOWED; |
| |
| } catch (SecurityException readSmsSecurityException) { |
| } |
| // Can be read with READ_PHONE_NUMBERS too. |
| try { |
| context.enforcePermission(android.Manifest.permission.READ_PHONE_NUMBERS, pid, uid, |
| message); |
| return appOps.noteOp(AppOpsManager.OPSTR_READ_PHONE_NUMBERS, uid, callingPackage, |
| callingFeatureId, null) == AppOpsManager.MODE_ALLOWED; |
| |
| } 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) Log.d(LOG_TAG, "No modify permission, check carrier privilege next."); |
| enforceCallingOrSelfCarrierPrivilege(context, 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) { |
| Log.d(LOG_TAG, "No READ_PHONE_STATE permission, check carrier privilege next."); |
| } |
| |
| enforceCallingOrSelfCarrierPrivilege(context, 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) { |
| Log.d(LOG_TAG, "No READ_PRIVILEGED_PHONE_STATE permission, " |
| + "check carrier privilege next."); |
| } |
| |
| enforceCallingOrSelfCarrierPrivilege(context, subId, message); |
| } |
| |
| /** |
| * Ensure the caller (or self, if not processing an IPC) has |
| * {@link android.Manifest.permission#READ_PRIVILEGED_PHONE_STATE} or |
| * {@link android.Manifest.permission#READ_PRECISE_PHONE_STATE} or carrier privileges. |
| * |
| * @throws SecurityException if the caller does not have the required permission/privileges |
| */ |
| public static void enforeceCallingOrSelfReadPrecisePhoneStatePermissionOrCarrierPrivilege( |
| Context context, int subId, String message) { |
| if (context.checkCallingOrSelfPermission(Manifest.permission.READ_PRIVILEGED_PHONE_STATE) |
| == PERMISSION_GRANTED) { |
| return; |
| } |
| |
| if (context.checkCallingOrSelfPermission(Manifest.permission.READ_PRECISE_PHONE_STATE) |
| == PERMISSION_GRANTED) { |
| return; |
| } |
| |
| if (DBG) { |
| Log.d(LOG_TAG, "No READ_PRIVILEGED_PHONE_STATE nor READ_PRECISE_PHONE_STATE permission" |
| + ", check carrier privilege next."); |
| } |
| |
| enforceCallingOrSelfCarrierPrivilege(context, 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( |
| Context context, 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(context, subId, Binder.getCallingUid(), message); |
| } |
| |
| private static void enforceCarrierPrivilege( |
| Context context, int subId, int uid, String message) { |
| if (getCarrierPrivilegeStatus(context, subId, uid) |
| != TelephonyManager.CARRIER_PRIVILEGE_STATUS_HAS_ACCESS) { |
| if (DBG) Log.e(LOG_TAG, "No Carrier Privilege."); |
| throw new SecurityException(message); |
| } |
| } |
| |
| /** Returns whether the provided uid has carrier privileges for any active subscription ID. */ |
| private static boolean checkCarrierPrivilegeForAnySubId(Context context, int uid) { |
| SubscriptionManager sm = (SubscriptionManager) context.getSystemService( |
| Context.TELEPHONY_SUBSCRIPTION_SERVICE); |
| int[] activeSubIds = sm.getCompleteActiveSubscriptionIdList(); |
| for (int activeSubId : activeSubIds) { |
| if (getCarrierPrivilegeStatus(context, activeSubId, uid) |
| == TelephonyManager.CARRIER_PRIVILEGE_STATUS_HAS_ACCESS) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private static int getCarrierPrivilegeStatus(Context context, int subId, int uid) { |
| final long identity = Binder.clearCallingIdentity(); |
| try { |
| TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService( |
| Context.TELEPHONY_SERVICE); |
| return telephonyManager.createForSubscriptionId(subId).getCarrierPrivilegeStatus(uid); |
| } finally { |
| Binder.restoreCallingIdentity(identity); |
| } |
| } |
| |
| /** |
| * 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"); |
| } |
| } |
