googleappenginejava。安全AccessControlException:拒绝访问（java.io.FilePermission）

Question

我正在google app engine java上创建一个应用程序，在其中我必须读取静态文件的内容。war目录中有一个名为myrsakey11的文件。pk8

我读取文件的代码段是

public static PrivateKey getPrivateKey(String privKeyFileName) throws IOException {
          File privKeyFile = new File(privKeyFileName);
          FileInputStream fis = new FileInputStream(privKeyFile);
          DataInputStream dis  = new DataInputStream(fis);

          byte[] privKeyBytes = new byte[(int) privKeyFile.length()];
          try {
            dis.read(privKeyBytes);
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
          dis.close();
          fis.close();

          String BEGIN = "-----BEGIN PRIVATE KEY-----";
          String END = "-----END PRIVATE KEY-----";
          String str = new String(privKeyBytes);

          if (str.contains(BEGIN) && str.contains(END)) {
            str = str.substring(BEGIN.length(), str.lastIndexOf(END));
          }

          KeyFactory fac;
        try {
            fac = KeyFactory.getInstance("RSA");

             EncodedKeySpec privKeySpec = new PKCS8EncodedKeySpec(Base64.decode(str));
              return fac.generatePrivate(privKeySpec);

        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (Base64DecoderException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
         return null;
    }

在这个函数中，我传递字符串“/myrsakey11.pk8”

我得到的完整错误日志是

java.security.AccessControlException: access denied (java.io.FilePermission /myrsakey11.pk8 read)
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:355)
    at java.security.AccessController.checkPermission(AccessController.java:567)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
    at com.google.apphosting.runtime.security.CustomSecurityManager.checkPermission(CustomSecurityManager.java:56)
    at java.lang.SecurityManager.checkRead(SecurityManager.java:888)
    at java.io.FileInputStream.<init>(FileInputStream.java:133)
    at org.ritesh.HelloWorldServlet.getPrivateKey(HelloWorldServlet.java:129)
    at org.ritesh.HelloWorldServlet.doGet(HelloWorldServlet.java:110)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:102)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
    at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:447)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:454)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:461)
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:703)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:338)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:330)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:458)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
    at java.lang.Thread.run(Thread.java:679)

谁能告诉我如何纠正这个错误

Answer 1

这件事也发生在我身上，我花了一段时间才弄明白：

如果您声明了一个错误的文件路径，Google AE不会抛出FileNotFoundException，而是抛出“AccessControlException:拒绝访问（读取）”

确保您的路径有效

Answer 2

您是否按照[1]中的说明授予对此静态文件的访问权限。 如何获取静态文件的路径？也许您可以将此文件用作ressource（将其放入WEB-INF文件夹），并按如下方式访问它：

ServletContext context = getContext();
InputStream resourceContent = context.getResourceAsStream("/WEB-INF/testinger.txt");

[1]https://developers.google.com/appengine/docs/java/config/appconfig#include-exclude

Answer 3

让已部署的appengine应用程序访问数据存储非常困难，而且this tutorial没有很好地解释这一点。我在应用程序中使用了常量，而不是使用教程中描述的环境变量。p12文件需要位于部署的应用程序可以访问的位置，例如/src/main/resources/

我是这样做的：

1. 把应用程序放到xxx上。p12文件位于backend/src/main/resources中，但也将其添加到中。我可以忽略它，因为它需要保密
2. 而不是像这样从环境中构建整个凭证

数据存储=数据存储工厂。get（）。创建（DatastoreHelper.getOptionsfromEnv（） .dataset（数据集\u ID）。build（））

根据教程的建议，我做了以下工作

Credential credential = getCredential();       
DatastoreOptions.Builder options = DatastoreHelper.getOptionsFromEnv().credential(credential);
datastore = DatastoreFactory.get().create(options.dataset(DATASET_ID).build());

其中getCredential（）的定义如下：

private Credential getCredential() throws GeneralSecurityException, IOException {
        final String serviceAccount = "123-xxx@developer.gserviceaccount.com";
        final String FILE_NAME = "/app-xxx.p12";

        URL url = getClass().getResource(FILE_NAME);
        String filename = url.getFile();
        return DatastoreHelper.getServiceAccountCredential(serviceAccount, filename);
    }