How to get the protection level for each permissio

问题:

Im trying to list the protection level for each permission in the selected application, for the code given below. But i do not know how to get it done.

ArrayList<String> list_permission = new ArrayList<String>();
        String[] reqp = info.requestedPermissions;
        if (reqp != null) {
            for (i = 0; i < reqp.length; i++) {

                k = i + 1;

                String a = reqp[i];
                if (a.contains("android.permission.")) {
                    String aa[] = a.split("android.permission.");
                    list_permission.add(aa[1]);
                } else {
                    list_permission.add(a);
                }

            }

        }

can anyone help me with this... just want to add the protection level in front of the permission.

回答1:

You can use PackageManager class getPermissionInfo() method to get PermissionInfo object for any particular permission. PermissionInfo object has property Protection Lavel that can be used to check the protection level of any permission... You can check it against the constant defined in the PermissoinInfo class like PROTECTION_FLAG_SYSTEM.

Like following code :

for (PermissionInfo permission : packageInfo.permissions) {
    // Dump permission info
    String protectionLevel;
    switch(permission.protectionLevel) {
    case PermissionInfo.PROTECTION_NORMAL : protectionLevel = "normal"; break;
    case PermissionInfo.PROTECTION_DANGEROUS : protectionLevel = "dangerous"; break;
    case PermissionInfo.PROTECTION_SIGNATURE : protectionLevel = "signature"; break;
    case PermissionInfo.PROTECTION_SIGNATURE_OR_SYSTEM : protectionLevel = "signatureOrSystem"; break;
    default : protectionLevel = "<unknown>"; break;
    }
    Log.i("PermissionCheck", permission.name + " " + protectionLevel);
  }

UPDATE:

To get the Protection level of requestedPermissions:

String[] reqp = info.requestedPermissions;
String perm = reqp[i];
if (perm.contains("android.permission.")) {
    try {
        PermissionInfo pi = getPackageManager().getPermissionInfo(perm, PackageManager.GET_META_DATA);
        String protctionLevel = "unknown";

        switch(pi.protectionLevel) {
            case PermissionInfo.PROTECTION_NORMAL : protctionLevel = "normal"; break;
            case PermissionInfo.PROTECTION_DANGEROUS : protctionLevel = "dangerous"; break;
            case PermissionInfo.PROTECTION_SIGNATURE : protctionLevel = "signature"; break;
            case PermissionInfo.PROTECTION_SIGNATURE_OR_SYSTEM : protctionLevel = "signatureOrSystem"; break;
            case PermissionInfo.PROTECTION_FLAG_SYSTEM : protctionLevel = "system"; break;
            default : protctionLevel = "<unknown>"; break;
        }
        list_permission.add(perm + "        "+protctionLevel);
    } catch (NameNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

} else {
    list_permission.add(perm);
}

Following line would only work on API level 16 or above:

        case PermissionInfo.PROTECTION_FLAG_SYSTEM : protctionLevel = "system"; break;

回答2:

// Get the permissions for the core android package

PackageInfo packageInfo = getPackageManager().getPackageInfo("android", PackageManager.GET_PERMISSIONS);
if (packageInfo.permissions != null) {
  // For each defined permission
  for (PermissionInfo permission : packageInfo.permissions) {
    // Dump permission info
    String protectionLevel;
    switch(permission.protectionLevel) {
    case PermissionInfo.PROTECTION_NORMAL : protectionLevel = "normal"; break;
    case PermissionInfo.PROTECTION_DANGEROUS : protectionLevel = "dangerous"; break;
    case PermissionInfo.PROTECTION_SIGNATURE : protectionLevel = "signature"; break;
    case PermissionInfo.PROTECTION_SIGNATURE_OR_SYSTEM : protectionLevel = "signatureOrSystem"; break;
    default : protectionLevel = "<unknown>"; break;
    }
    Log.i("PermissionCheck", permission.name + " " + protectionLevel);
  }
}