java - Android 权限保护级别 18 和 50

Question

当我转储 Nexus 7 上所有应用程序的所有权限时，我(如预期的那样)获得保护级别为 0(正常)、1(危险)、2(签名)的权限。 3 (SIGNATURE_OR_SYSTEM)* 下没有任何日志记录。

但是也有很多权限的保护级别设置为'18'，有些权限设置为'50'。

我找不到关于这些值代表什么的任何文档。有人知道吗？

*它不会记录低于 3 的任何内容。

这些是记录的内容:

android.permission.ACCESS_CACHE_FILESYSTEM - 18
android.permission.ACCESS_CHECKIN_PROPERTIES - 18
android.permission.ACCESS_DOWNLOAD_MANAGER - 18
android.permission.ACCESS_DOWNLOAD_MANAGER_ADVANCED - 18
android.permission.ACCESS_MTP - 18
android.permission.ALLOW_ANY_CODEC_FOR_PLAYBACK - 18
android.permission.BACKUP - 18
android.permission.BIND_APPWIDGET - 18
android.permission.BIND_DIRECTORY_SEARCH - 18
android.permission.BIND_KEYGUARD_APPWIDGET - 18
android.permission.BIND_REMOTEVIEWS - 18
android.permission.BIND_WALLPAPER - 18
android.permission.CALL_PRIVILEGED - 18
android.permission.CHANGE_COMPONENT_ENABLED_STATE - 18
android.permission.CHANGE_CONFIGURATION - 18
android.permission.CONNECTIVITY_INTERNAL - 18
android.permission.CONTROL_LOCATION_UPDATES - 18
android.permission.CRYPT_KEEPER - 18
android.permission.DELETE_CACHE_FILES - 18
android.permission.DELETE_PACKAGES - 18
android.permission.DOWNLOAD_CACHE_NON_PURGEABLE - 18
android.permission.GLOBAL_SEARCH - 18
android.permission.INSTALL_LOCATION_PROVIDER - 18
android.permission.INSTALL_PACKAGES - 18
android.permission.MANAGE_USB - 18
android.permission.MANAGE_USERS - 18
android.permission.MASTER_CLEAR - 18
android.permission.MODIFY_APPWIDGET_BIND_PERMISSIONS - 18
android.permission.MODIFY_NETWORK_ACCOUNTING - 18
android.permission.MODIFY_PHONE_STATE - 18
android.permission.MOUNT_FORMAT_FILESYSTEMS - 18
android.permission.MOUNT_UNMOUNT_FILESYSTEMS - 18
android.permission.MOVE_PACKAGE - 18
android.permission.PACKAGE_USAGE_STATS - 18
android.permission.PACKAGE_VERIFICATION_AGENT - 18
android.permission.PERFORM_CDMA_PROVISIONING - 18
android.permission.READ_FRAME_BUFFER - 18
android.permission.READ_NETWORK_USAGE_HISTORY - 18
android.permission.READ_PRIVILEGED_PHONE_STATE - 18
android.permission.REBOOT - 18
android.permission.RECEIVE_DATA_ACTIVITY_CHANGE - 18
android.permission.RECEIVE_EMERGENCY_BROADCAST - 18
android.permission.RETRIEVE_WINDOW_CONTENT - 18
android.permission.SEND_SMS_NO_CONFIRMATION - 18
android.permission.SERIAL_PORT - 18
android.permission.SET_TIME - 18
android.permission.SET_WALLPAPER_COMPONENT - 18
android.permission.SHUTDOWN - 18
android.permission.STATUS_BAR - 18
android.permission.STOP_APP_SWITCHES - 18
android.permission.UPDATE_DEVICE_STATS - 18
android.permission.UPDATE_LOCK - 18
android.permission.WRITE_APN_SETTINGS - 18
android.permission.WRITE_GSERVICES - 18
android.permission.WRITE_MEDIA_STORAGE - 18
com.android.chrome.TOS_ACKED - 18
com.android.launcher.permission.PRELOAD_WORKSPACE - 18
com.android.vending.TOS_ACKED - 18
com.android.vending.billing.ADD_CREDIT_CARD - 18
com.android.vending.billing.BILLING_ACCOUNT_SERVICE - 18
com.google.android.c2dm.permission.SEND - 18
com.google.android.gallery3d.permission.GALLERY_PROVIDER - 18
com.google.android.gtalkservice.permission.SEND_HEARTBEAT - 18
com.google.android.partnersetup.permission.UPDATE_CLIENT_ID - 18
com.google.android.permission.BROADCAST_DATA_MESSAGE - 18
com.google.android.providers.gsf.permission.WRITE_GSERVICES - 18
com.google.android.xmpp.permission.BROADCAST - 18
com.google.android.xmpp.permission.XMPP_ENDPOINT_BROADCAST - 18

android.permission.CHANGE_CONFIGURATION - 50
android.permission.DUMP - 50
android.permission.INTERACT_ACROSS_USERS - 50
android.permission.READ_LOGS - 50
android.permission.SET_ALWAYS_FINISH - 50
android.permission.SET_ANIMATION_SCALE - 50
android.permission.SET_DEBUG_APP - 50
android.permission.SET_PROCESS_LIMIT - 50
android.permission.SIGNAL_PERSISTENT_PROCESSES - 50
android.permission.WRITE_SECURE_SETTINGS - 50

Answer 1

刚刚看到一个 Unresolved 老问题。尽管您可能已经得到答案，但我还是会回答。它可能会帮助其他人。 :)

there are also a lot of permissions whose protection level is set at '18' and some that are '50'.

以下代码是从Android Source中的PermissionInfo.java中获取的:

/**
 * Additional flag for {@link #protectionLevel}, corresponding
 * to the <code>system</code> value of
 * {@link android.R.attr#protectionLevel}.
 */
public static final int PROTECTION_FLAG_SYSTEM = 0x10;

/**
 * Additional flag for {@link #protectionLevel}, corresponding
 * to the <code>development</code> value of
 * {@link android.R.attr#protectionLevel}.
 */
public static final int PROTECTION_FLAG_DEVELOPMENT = 0x20;

因此，如果有签名/系统权限，级别将为 18(0x10 | 0x2)。如果权限用于特殊开发工具，则为50(0x10 | 0x20 | 0x2)。

I can't find any documentation on what these values represent. Does anybody know?

作为我answered in an existing question ，你可以在frameworks/base/core/res/AndroidManifest.xml和frameworks/base/data/etc/platform.xml中查看保护级别和这些权限的描述>。我将其中的一些张贴在这里供您引用。

<!-- Configure an application for debugging. -->
<permission android:name="android.permission.SET_DEBUG_APP"
    android:permissionGroup="android.permission-group.DEVELOPMENT_TOOLS"
    android:protectionLevel="signature|system|development"
    android:label="@string/permlab_setDebugApp"
    android:description="@string/permdesc_setDebugApp" />

<!-- @hide Package verifier needs to have this permission before the PackageManager will
     trust it to verify packages.
-->
<permission android:name="android.permission.PACKAGE_VERIFICATION_AGENT"
    android:label="@string/permlab_packageVerificationAgent"
    android:description="@string/permdesc_packageVerificationAgent"
    android:protectionLevel="signature|system" />

如果该 xml block 上有 @hide 注释，您无法从文档中找到有关此权限的任何资源。