WindowsFileSystemProvider checkAccess

[Salter, Thomas A]

I've encountered a problem with WindowsFileSystemProvider checkAccess function.  When I'm running as an administrator, everything is fine, but when I run as an ordinary user (member of the default Users group),  the GetEffectiveRightsFromAcl function fails with an Access Denied (5) error result.  I've tried giving the individual user as well as the Users group "full control", but the only thing that seems to work is running under an administrator account.

I'm proven that the user does have access to the file by reading from the file from the same program after isReadable() returns false.  My test program is included below.

I'm running on Windows 7 with the FCS version of Java 7 downloaded from the public Java technology site: http://www.oracle.com/technetwork/java/index.html

Along the way, I noticed that WindowsNativeDispatcher.c does not test correctly for an error code.  The actual error is returned as the result, not with GetLastError.  My suggested change follows:

#if OLD CODE
    if (GetEffectiveRightsFromAcl(pAcl, pTrustee, &access) != ERROR_SUCCESS) {
        throwWindowsException(env, GetLastError());
    }
#else //NEW CODE
    DWORD result = GetEffectiveRightsFromAcl(pAcl, pTrustee, &access);
    if( result != ERROR_SUCCESS) {
        throwWindowsException(env, result );
    }
#endif



import java.io.*;
import java.nio.charset.*;
import java.nio.file.*;

public class WinNIO
{
    public static void main(String[] args) throws IOException
    {
        WinNIO nio = new WinNIO();
        nio.testReadable( "C:\\Windows\\System32\\drivers\\etc\\hosts" );
        nio.testReadable( "C:\\java\\jdk7_fcs\\jre\\readme.txt" );
    }

    void testReadable(String file) throws IOException
    {
        Path path = Paths.get( file );
        boolean isReadable = Files.isReadable( path );

        System.out.println(path + ": isReadable:" + isReadable );
        BufferedReader br = Files.newBufferedReader( path, Charset.defaultCharset() );
        LineNumberReader lr = new LineNumberReader(br);
        String line = lr.readLine();
        System.out.println(line);
    }

}




Tom Salter  |  Software Engineer  |  Java & Middleware Development

Unisys  |  476 Swedesford Road  |  Malvern, PA  19355   |  610-648-2568 |  N385-2568


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