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);
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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);
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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
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
while (it.hasNext()) {
String whitelisItem = it.next();
if (pkgName.equals(whitelisItem)) {
return true;
}
}
return false;
}
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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);
}
......
}
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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
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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
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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()));
}
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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)
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/**
* 包管理方式名称
* 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:
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private static HashSet
throws IOException, GeneralSecurityException {
HashSet
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)
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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
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
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。
---------------------
作者:long375577908
来源:CSDN
原文:https://blog.csdn.net/long375577908/article/details/78721010
版权声明:本文为博主原创文章,转载请附上博文链接!