android手机root后的安全问题 （四）

导读： 本文介绍了如何实现禁止开机启动以及如何使应用失效。

希望大家不要制造各种流氓软件或病毒

 

这一期我们来关注以下某些优化软件的开机优化功能

禁止开机启动和禁止

 

很多软件都有开机优化功能，比如360，金山，海卓……

我觉得海卓页面还不错，所以就截一张海卓的图片吧

点击右边的小旗，会有一些选项，这里只说两个

开机启动

程序状态

 

在android 4.1（jelly bean）版本中，settings中查看应用信息的地方有一个disable按钮，如下图

disable掉这个应用之后，在launcher列表中是查询不到的，也就是说，你无法启动这个应用了，也合理，但是如果你想enable就有些麻烦了。你得在settings中的应用列表中找到这个应用（一般出厂的手机，都有几十个应用，再加上自己安装的，应用数量很容易就100+了），然后再enable，这时候，launcher中就能再次看到这个应用了

（ps：还可以控制是否显示通知，这个功能估计大家都喜欢）

 

但是4.0及其之前的版本是没有disable这个功能的，但是如果root了手机，那么我们是可以实现这个功能的。

首选我们先看看手机中应用哪些是enabled的

$ pm list package -e
package:android
package:cn.buding.coupon
package:cn.buding.moviecoupon
package:cn.chinabus.main
package:cn.chinabus.metro.main
package:cn.com.fetion
……

我看了一下我的手机，居然有249个enabled的程序，汗！

$ pm list package -e | busybox wc -l                         
249

查看disabled的应用改下选项就可以了

$ pm list package -d

我们先来看看pm都能做些什么

pm list packages: prints all packages, optionally only
  those whose package name contains the text in FILTER.  Options:
    -f: see their associated file.
    -d: filter to only show disbled packages.
    -e: filter to only show enabled packages.
    -s: filter to only show system packages.
    -3: filter to only show third party packages.
    -u: also include uninstalled packages.


pm enable, disable, disable-user: these commands change the enabled state
  of a given package or component (written as "package/class").

这里只截取了一部分，详情请自行查看pm帮助

 

大家可以拿一个无关紧要的程序试试，disable再enable，看看launcher有什么变化（需要root权限，之前的查询是不需要root权限的） ，比如：

pm disable cn.eoe.wiki
pm enable cn.eoe.wiki

注：切换到root用户时，执行pm可能会出现段错误（android 4.0+）

 

shell@android:/ # pm
[1] + Stopped (signal)     pm 
shell@android:/ # pm                                                           
[2] + Stopped (signal)     pm 
[1] - Segmentation fault   pm 

 

我们在执行pm之前，export一下LD_LIBRARY_PATH即可

 

export LD_LIBRARY_PATH=/vendor/lib:/system/lib

 

我们可以查看一下这个变量

 

echo $LD_LIBRARY_PATH

在我机器上面，普通用户是设置了这个变量的，切换到root的时候，这个变量就空了，所以需要重新export一下

 

 

第一个功能程序状态 讲解就结束了。

 

其实大多数人关心的是第二个功能开机启动 问题

首选，我们需要明确的是：我们需要知道哪些应用具有开机启动功能。

其实精确到应用还不可以，因为我们不是要把应用禁止掉，而是要把接收开机启动的Intent的receiver禁止掉，所以我们需要精确到class

首先我们来看看接收BOOT_COMPLETED的receiver在manifest中如何注册的

<receiver android:name=".BootReceiver" android:enabled="true">
    <intent-filter>    
        <action android:name="android.intent.action.BOOT_COMPLETED"/> 
    </intent-filter>
</receiver>

这里有一点是需要特别注意的： android:enabled="true"

enabled这个属性，大多数情况下我们是不显式写在这里的，当然，默认值就为true

禁止开机启动，其实就是设置接收BOOT_COMPLETED的receiver状态为disabled，即android:enabled="false"

首先要解决的就是如何获得所有接收BOOT_COMPLETED的receiver

开始我也搜索了一下，发现网上的很多方法都不可用，这里给大家说明一下：

错误方法1

 

Intent intent = new Intent(Intent.ACTION_BOOT_COMPLETED);
List<ResolveInfo> resolveInfoList = mPackageManager.queryBroadcastReceivers(intent, PackageManager.GET_RESOLVED_FILTER);

这里返回的list都是enabled的receiver

 

错误方法2

List<ApplicationInfo> allAppsList = mPackageManager.getInstalledApplications(0);
int allAppsListSize = allAppsList.size();
for (int i = 0; i < allAppsListSize; i++) {
	ApplicationInfo applicationInfo = allAppsList.get(i);
	PackageInfo packageInfo = mPackageManager.getPackageInfo(applicationInfo.packageName, PackageManager.GET_RECEIVERS);
	ActivityInfo[] receivers = packageInfo.receivers;
	if(receivers != null) {
            ……
	}
}

这里获得的也都是enable的

 

错误方法3

有的人使用下面代码片断

 

if (PackageManager.PERMISSION_GRANTED == mPackageManager.checkPermission("android.permission.RECEIVE_BOOT_COMPLETED", app.packageName))

检查package干什么？！

 

其实android原生给我们提供了如何获得所有component的api（enabled+disabled）

int android.content.pm.PackageManager.GET_DISABLED_COMPONENTS = 512 [0x200]

PackageInfo flag: include disabled components in the returned info.

 

这样，我们使用如下代码就可以了

Intent intent = new Intent(Intent.ACTION_BOOT_COMPLETED);
List<ResolveInfo> resolveInfoList = mPackageManager.queryBroadcastReceivers(intent, PackageManager.GET_DISABLED_COMPONENTS);

然后我们需要知道组件的状态，disabled还是enabled

ComponentName mComponentName = new ComponentName(resolveInfo.activityInfo.packageName, resolveInfo.activityInfo.name);
Log.d(TAG, "COMPONENT_ENABLED_STATE:" + mPackageManager.getComponentEnabledSetting(mComponentName) + "\tpackageName:" + resolveInfo.activityInfo.packageName);

接下来的事情就简单了，如果你想禁止包名为package的应用开机启动，那么只需在上面list中，找到所有此包下的receiver，然后

pm disable package/class
pm enable package/class

即可

 

我们需要关注下面几个COMPONENT_ENABLED_STATE

 

 写道

public static final int COMPONENT_ENABLED_STATE_DEFAULT

Since: API Level 1
Flag for setApplicationEnabledSetting(String, int, int) and setComponentEnabledSetting(ComponentName, int, int): This component or application is in its default enabled state (as specified in its manifest).

Constant Value: 0 (0x00000000)
public static final int COMPONENT_ENABLED_STATE_DISABLED

Since: API Level 1
Flag for setApplicationEnabledSetting(String, int, int) and setComponentEnabledSetting(ComponentName, int, int): This component or application has been explicitly disabled, regardless of what it has specified in its manifest.

Constant Value: 2 (0x00000002)
public static final int COMPONENT_ENABLED_STATE_DISABLED_USER

Since: API Level 14
Flag for setApplicationEnabledSetting(String, int, int) only: The user has explicitly disabled the application, regardless of what it has specified in its manifest. Because this is due to the user's request, they may re-enable it if desired through the appropriate system UI. This option currently can not be used with setComponentEnabledSetting(ComponentName, int, int).

Constant Value: 3 (0x00000003)
public static final int COMPONENT_ENABLED_STATE_ENABLED

Since: API Level 1
Flag for setApplicationEnabledSetting(String, int, int) and setComponentEnabledSetting(ComponentName, int, int): This component or application has been explictily enabled, regardless of what it has specified in its manifest.

Constant Value: 1 (0x00000001)
public static final int DONT_KILL_APP

Since: API Level 1
Flag parameter for setComponentEnabledSetting(android.content.ComponentName, int, int) to indicate that you don't want to kill the app containing the component. Be careful when you set this since changing component states can make the containing application's behavior unpredictable.

Constant Value: 1 (0x00000001)

 

 

如果是自己应用中想disable或者enable自己的组件，那么是不需要任何权限的，当然不能使用pm命令

在原生email(4.0)应用中，旧有此功能，我们来看看email的代码

void com.android.email.service.EmailBroadcastProcessorService.setComponentEnabled(Class<?> clazz, boolean enabled)

private void setComponentEnabled(Class<?> clazz, boolean enabled) {
    final ComponentName c = new ComponentName(this, clazz.getName());
    getPackageManager().setComponentEnabledSetting(c,
            enabled ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED
                    : PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
            PackageManager.DONT_KILL_APP);
}

 

void com.android.email.Email.setServicesEnabled(Context context, boolean enabled)方法中也有参考代码

 

至此，开机启动、禁用程序 就全部讲解完了。

我们发现，海卓这个应用居然有这么多变态功能，居然可以禁止所有事件。。。这是不是过分了点，不过程序的原理应该都在我这篇博客之中了，我不太希望有禁止所有事件这种功能，那还不如把这个app删掉呢，何必折磨它呢？！

 

 

请大家不要用root的手机随意下载软件，更不要以任何借口制造任何病毒！

 

 

 

android手机root后的安全问题 （一）

android手机root后的安全问题 （二）

android手机root后的安全问题 （三）

android手机root后的安全问题 （四）

 

 

android安全问题（一） 静音拍照与被拍

android安全问题（二） 程序锁

android安全问题（三） 钓鱼程序

 

 

转贴请保留以下链接

本人blog地址

http://su1216.iteye.com/

http://blog.csdn.net/su1216/

评论

4 楼 N_HH 2013-01-08  

su1216 写道

N_HH 写道

那个，请问，pm是什么。。不懂。

shell@android:/ $ pm --help
Error: unknown command '--help'
usage: pm list packages [-f] [-d] [-e] [-s] [-e] [-u] [FILTER]
       pm list permission-groups
       pm list permissions [-g] [-f] [-d] [-u] [GROUP]
       pm list instrumentation [-f] [TARGET-PACKAGE]
       pm list features
       pm list libraries
       pm path PACKAGE
       pm install [-l] [-r] [-t] [-i INSTALLER_PACKAGE_NAME] [-s] [-f] PATH
       pm uninstall [-k] PACKAGE
       pm clear PACKAGE
       pm enable PACKAGE_OR_COMPONENT
       pm disable PACKAGE_OR_COMPONENT
       pm disable-user PACKAGE_OR_COMPONENT
       pm set-install-location [0/auto] [1/internal] [2/external]
       pm get-install-location
       pm createUser USER_NAME
       pm removeUser USER_ID

pm list packages: prints all packages, optionally only
  those whose package name contains the text in FILTER.  Options:
    -f: see their associated file.
    -d: filter to only show disbled packages.
    -e: filter to only show enabled packages.
    -s: filter to only show system packages.
    -3: filter to only show third party packages.
    -u: also include uninstalled packages.

pm list permission-groups: prints all known permission groups.

pm list permissions: prints all known permissions, optionally only
  those in GROUP.  Options:
    -g: organize by group.
    -f: print all information.
    -s: short summary.
    -d: only list dangerous permissions.
    -u: list only the permissions users will see.

pm list instrumentation: use to list all test packages; optionally
  supply <TARGET-PACKAGE> to list the test packages for a particular
  application.  Options:
    -f: list the .apk file for the test package.

pm list features: prints all features of the system.

pm path: print the path to the .apk of the given PACKAGE.

pm install: installs a package to the system.  Options:
    -l: install the package with FORWARD_LOCK.
    -r: reinstall an exisiting app, keeping its data.
    -t: allow test .apks to be installed.
    -i: specify the installer package name.
    -s: install package on sdcard.
    -f: install package on internal flash.

pm uninstall: removes a package from the system. Options:
    -k: keep the data and cache directories around after package removal.

pm clear: deletes all data associated with a package.

pm enable, disable, disable-user: these commands change the enabled state
  of a given package or component (written as "package/class").

pm get-install-location: returns the current install location.
    0 [auto]: Let system decide the best location
    1 [internal]: Install on internal device storage
    2 [external]: Install on external media

pm set-install-location: changes the default install location.
  NOTE: this is only intended for debugging; using this can cause
  applications to break and other undersireable behavior.
    0 [auto]: Let system decide the best location
    1 [internal]: Install on internal device storage
    2 [external]: Install on external media

很详细。。谢了哈

3 楼 su1216 2013-01-07  

N_HH 写道

那个，请问，pm是什么。。不懂。

shell@android:/ $ pm --help
Error: unknown command '--help'
usage: pm list packages [-f] [-d] [-e] [-s] [-e] [-u] [FILTER]
       pm list permission-groups
       pm list permissions [-g] [-f] [-d] [-u] [GROUP]
       pm list instrumentation [-f] [TARGET-PACKAGE]
       pm list features
       pm list libraries
       pm path PACKAGE
       pm install [-l] [-r] [-t] [-i INSTALLER_PACKAGE_NAME] [-s] [-f] PATH
       pm uninstall [-k] PACKAGE
       pm clear PACKAGE
       pm enable PACKAGE_OR_COMPONENT
       pm disable PACKAGE_OR_COMPONENT
       pm disable-user PACKAGE_OR_COMPONENT
       pm set-install-location [0/auto] [1/internal] [2/external]
       pm get-install-location
       pm createUser USER_NAME
       pm removeUser USER_ID

pm list packages: prints all packages, optionally only
  those whose package name contains the text in FILTER.  Options:
    -f: see their associated file.
    -d: filter to only show disbled packages.
    -e: filter to only show enabled packages.
    -s: filter to only show system packages.
    -3: filter to only show third party packages.
    -u: also include uninstalled packages.

pm list permission-groups: prints all known permission groups.

pm list permissions: prints all known permissions, optionally only
  those in GROUP.  Options:
    -g: organize by group.
    -f: print all information.
    -s: short summary.
    -d: only list dangerous permissions.
    -u: list only the permissions users will see.

pm list instrumentation: use to list all test packages; optionally
  supply <TARGET-PACKAGE> to list the test packages for a particular
  application.  Options:
    -f: list the .apk file for the test package.

pm list features: prints all features of the system.

pm path: print the path to the .apk of the given PACKAGE.

pm install: installs a package to the system.  Options:
    -l: install the package with FORWARD_LOCK.
    -r: reinstall an exisiting app, keeping its data.
    -t: allow test .apks to be installed.
    -i: specify the installer package name.
    -s: install package on sdcard.
    -f: install package on internal flash.

pm uninstall: removes a package from the system. Options:
    -k: keep the data and cache directories around after package removal.

pm clear: deletes all data associated with a package.

pm enable, disable, disable-user: these commands change the enabled state
  of a given package or component (written as "package/class").

pm get-install-location: returns the current install location.
    0 [auto]: Let system decide the best location
    1 [internal]: Install on internal device storage
    2 [external]: Install on external media

pm set-install-location: changes the default install location.
  NOTE: this is only intended for debugging; using this can cause
  applications to break and other undersireable behavior.
    0 [auto]: Let system decide the best location
    1 [internal]: Install on internal device storage
    2 [external]: Install on external media

2 楼 N_HH 2013-01-07  

那个，请问，pm是什么。。不懂。

1 楼 Lovic 2012-09-11  

ooooooooooooooooooo