参考地址:https://blog.csdn.net/long375577908/article/details/78721010
有些项目不允许所有APK都拥有安装权限,例如apk只能通过应用商城来安装或者升级,只允许某些特定的apk自升级,不允许pm install等。这就需要添加安装权限白名单来控制。
先介绍android中常用的几种安装方式,好针对这几种进行修改
1、 直接调用安装接口。
-
Uri mPackageURI = Uri.fromFile( new File(Environment.getExternalStorageDirectory() + apkName));
-
-
int installFlags = 0;
-
PackageManager pm = getPackageManager();
-
try{
-
PackageInfo pi = pm.getPackageInfo(packageName,
-
PackageManager.GET_UNINSTALLED_PACKAGES);
-
if(pi != null) {
-
installFlags |= PackageManager.REPLACE_EXISTING_PACKAGE;
-
}
-
}
-
catch (NameNotFoundException e){}
-
PackageInstallObserver observer = new PackageInstallObserver();
-
pm.installPackage(mPackageURI, observer, installFlags);
这种修改需要直接修改packageManagerService。对应下面的第一种方法。
2、通过Intent机制,调用packageInstaller进行安装。
-
String fileName = Environment .getExternalStorageDirectory() + apkName;
-
Uri uri = Uri .fromFile( new File(fileName));
-
Intent intent = new Intent(Intent .ACTION_VIEW);
-
intent .setDataAndType(Uri, application/vnd .android .package -archive ");
-
startActivity(intent);
因为应用是通过packageInstaller进行安装的,相当于隔了一层代理,所以在packageManagerService并无法判断正在调用安装的是哪个app,只能在packageInstaller中进行修改,参考下面的第二中方法。
3、通过命令进行安装 pm install,参考第三种方法修改。
1、packageManagerService修改
packageManagerService的修改,我们在其中添加接口及代码来控制apk安装。
1)增加以下函数:
-
private boolean isWhiteListApp( String pkgName){
-
final File systemDir;
-
final File whitelistFile;
-
final ArrayList< String> whiteListApps = new ArrayList< String>();
-
systemDir = new File( "/system/", "etc");
-
whitelistFile = new File(systemDir, "whitelistapps");
-
if (!whitelistFile.exists()) {
-
return false;
-
}
-
try {
-
whiteListApps.clear();
-
BufferedReader br = new BufferedReader( new FileReader(whitelistFile));
-
String line = br.readLine();
-
while (line != null) {
-
//Log.d(TAG, "whitelistapps readLine:" + line);
-
whiteListApps.add(line);
-
line = br.readLine();
-
}
-
br.close();
-
} catch (IOException e) {
-
Log.e(TAG, "IO Exception happened while reading whitelistapps");
-
e.printStackTrace();
-
return false;
-
}
-
Iterator< String> it = whiteListApps.iterator();
-
while (it.hasNext()) {
-
String whitelisItem = it.next();
-
if (pkgName.equals(whitelisItem)) {
-
return true;
-
}
-
}
-
return false;
-
}
isWhiteListApp函数会去读取白名单文件/system/etc/whitelistapps,然后和我们传进来的包名进行匹配,在白名单中返回true,其他情况均返回false。
2)获取调用的包名判断是否在白名单中
接下来要在installPackageLI函数对调用安装的apk进行匹配,判断是否在白名单中,如果不在的话则提示错误。
-
private void installPackageLI(InstallArgs args, PackageInstalledInfo res) {
-
......
-
try {
-
pp.collectCertificates(pkg, parseFlags);
-
pp.collectManifestDigest(pkg);
-
} catch (PackageParserException e) {
-
res.setError( "Failed collect during installPackageLI", e);
-
return;
-
}
-
-
// longroey++ start
-
if(!isWhiteListApp(pkg.packageName)) {
-
res.setError(PackageManager.INSTALL_FAILED_VERIFICATION_FAILURE,
-
"app is not in the whitelist. packageName:" + pkg.packageName);
-
return;
-
}
-
// longroey++ end
-
-
/* If the installer passed in a manifest digest, compare it now. */
-
if (args.manifestDigest != null) {
-
if (DEBUG_INSTALL) {
-
final String parsedManifest = pkg.manifestDigest == null ? "null"
-
: pkg.manifestDigest.toString();
-
Slog.d(TAG, "Comparing manifests: " + args.manifestDigest.toString() + " vs. "
-
+ parsedManifest);
-
}
-
if (!args.manifestDigest.equals(pkg.manifestDigest)) {
-
res.setError(INSTALL_FAILED_PACKAGE_CHANGED, "Manifest digest changed");
-
return;
-
}
-
} else if (DEBUG_INSTALL) {
-
final String parsedManifest = pkg.manifestDigest == null
-
? "null" : pkg.manifestDigest.toString();
-
Slog.d(TAG, "manifestDigest was not present, but parser got: " + parsedManifest);
-
}
-
-
......
-
-
}
3) 增加白名单
/system/etc/whitelistapps内容如下,在编译时可以在mk中修改拷贝到etc目录下,例如下面就是允许这三个包名有安装权限。
com.xxx.xxx1
com.xxx.xxx2
com.xxx.xxx3
2、packageInstaller的修改
还是参考packageManagerService的修改,增加isWhiteListApp函数,去读取白名单文件/system/etc/whitelistapps,然后进行包名匹配,在白名单中返回true,其他情况均返回false。
我们在packageInstaller的PackageInstallerActivity.java中增加以下修改// add for installer enable/disable ,不在白名单中的app,会直接提示不允许安装后退出。
-
protected void onCreate (Bundle icicle) {
-
super.onCreate(icicle);
-
-
// get intent information
-
final Intent intent = getIntent();
-
mPackageURI = intent.getData();
-
mPm = getPackageManager();
-
final int uid = getOriginatingUid(intent);
-
String callingApp = mPm.getNameForUid(uid);
-
final File sourceFile = new File(mPackageURI.getPath());
-
PackageParser.Package parsed = PackageUtil.getPackageInfo(sourceFile);
-
mPkgInfo = PackageParser.generatePackageInfo(parsed, null,
-
PackageManager.GET_PERMISSIONS, 0, 0, null,
-
new PackageUserState());
-
-
// add for installer enable/disable
-
if (!isWhiteListApp(callingApp)) {
-
Toast.makeText( this, R.string.install_not_allow, Toast.LENGTH_LONG).show();
-
this.finish();
-
}
-
mOriginatingURI = intent.getParcelableExtra(Intent.EXTRA_ORIGINATING_URI);
-
...省略
3、pm install的修改
禁止pm install,因为有些APK安装竟然是调用pm install命令去安装的。
修改要在pm.java修改,修改方法和上面基本一致。
可以看到,pm install其实调用的是run再去判断参数。
-
public static void main(String[] args) {
-
new Pm().run(args);
-
}
-
-
public void run(String[] args) {
-
...省略
-
if ( "install". equals(op)) {
-
runInstall();
-
return;
-
}
-
...省略
那我们要添加的话,先获取app名,再和packageManagerService一样,增加isWhiteListApp去判断是不是要调用runInstall()就OK了。
String callingApp = "";
try {
callingApp = mPm.getNameForUid(Binder.getCallingUid());
} catch(RemoteException re) {
Log.e("Pm", Log.getStackTraceString(new Throwable()));
}
APK安装时的过滤方式:包名白名单、证书认证
1.定义一些全局变量,文件位置:
Build.java (frameworks\base\core\java\android\os)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
/**
* 包管理方式名称<br>
* whitelist: 白名单方式
* certificate: 证书认证方式
* none: 不进行管理
*/
public
static
String packageManage =
"none"
;
/**
* 允许 Launch 显示的 APP 及 APP 白名单
*/
public
static
String[] packageAllow =
new
String[]{
"com.baidu.searchbox"
,
"com.thinta.product.thintazlib"
,
"com.thinta.product.x4usertool"
};
/**
* 允许 Launch 显示的 APP的 证书存放路径
*/
public
static
String certificatePath =
"/system/etc/security/media.zip"
;
|
2.修改安装APK过程,在安装过程添加验证
修改文件的位置:
PackageManagerService.java (frameworks\base\services\core\java\com\android\server\pm)
首先添加一个函数:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
|
private
static
HashSet<X509Certificate> getTrustedCerts(File keystore)
throws
IOException, GeneralSecurityException {
HashSet<X509Certificate> trusted =
new
HashSet<X509Certificate>();
if
(keystore ==
null
) {
return
trusted;
}
ZipFile zip =
new
ZipFile(keystore);
try
{
CertificateFactory cf = CertificateFactory.getInstance(
"X.509"
);
Enumeration<?
extends
ZipEntry> entries = zip.entries();
while
(entries.hasMoreElements()) {
ZipEntry entry = entries.nextElement();
InputStream is = zip.getInputStream(entry);
try
{
trusted.add((X509Certificate) cf.generateCertificate(is));
}
finally
{
is.close();
}
}
}
finally
{
zip.close();
}
return
trusted;
}
|
修改的函数:private void installPackageLI(InstallArgs args, PackageInstalledInfo res)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
3
|
第一处修改:
if
(Build.ThintaCust.packageManage.equals(
"certificate"
))
tmp_flags = PackageManager.GET_SIGNATURES;
final
int
parseFlags = mDefParseFlags | PackageParser.PARSE_CHATTY
| (forwardLocked ? PackageParser.PARSE_FORWARD_LOCK :
0
)
| (onSd ? PackageParser.PARSE_ON_SDCARD :
0
) | tmp_flags;
第二处修改:
if
(Build.ThintaCust.packageManage.equals(
"none"
)){
Log.d(
"XYP_DEBUG"
,
"packageManage = none \n"
);
}
else
if
(Build.ThintaCust.packageManage.equals(
"whitelist"
)){
Log.d(
"XYP_DEBUG"
,
"packageManage = whitelist \n"
);
List<String> list = Arrays.asList(Build.ThintaCust.packageAllow);
if
(list.contains(pkg.packageName)){
Log.d(
"XYP_DEBUG"
,
"can install \n"
);
}
else
{
Log.d(
"XYP_DEBUG"
,
"forbid install \n"
);
res.setError(PackageManager.INSTALL_FAILED_USER_RESTRICTED,
"installPackageLI, forbid install"
);
return
;
}
}
else
if
(Build.ThintaCust.packageManage.equals(
"certificate"
)){
int
verify_pass =
0
;
try
{
File file =
new
File(Build.ThintaCust.certificatePath);
HashSet<X509Certificate> trusted = getTrustedCerts(file);
CertificateFactory cf = CertificateFactory.getInstance(
"X.509"
);
for
(X509Certificate c : trusted) {
String tmp_public_key = c.getPublicKey().toString();
for
(Signature sig : pkg.mSignatures)
{
X509Certificate cert = (X509Certificate)cf.generateCertificate(
new
ByteArrayInputStream(sig.toByteArray()));
String tmp_key = cert.getPublicKey().toString();
if
(tmp_public_key.equals(tmp_key)){
verify_pass =
1
;
break
;
}
}
if
(verify_pass ==
1
)
break
;
}
if
(verify_pass !=
1
){
Log.d(
"XYP_DEBUG"
,
"forbid install \n"
);
res.setError(PackageManager.INSTALL_FAILED_USER_RESTRICTED,
"installPackageLI, forbid install"
);
return
;
}
}
catch
(FileNotFoundException e){
Log.d(
"XYP_DEBUG"
, e.toString());
}
catch
(CertificateException e){
Log.d(
"XYP_DEBUG"
, e.toString());
}
catch
(IOException e){
Log.d(
"XYP_DEBUG"
, e.toString());
}
catch
(GeneralSecurityException e){
Log.d(
"XYP_DEBUG"
, e.toString());
}
}
|
3.证书的压缩方式:
zip -r media.zip media.x509.pem
直接用命令把*.x509.pem 打包成zip文件,然后放到目标板的合适位置;
用第一步中的certificatePath指向存放该zip文件的位置。