[I] The owner and group of the sftp connection file show an exception [mina-sshd]

[via GitHub]

czldb2 opened a new issue, #751:
URL: https://github.com/apache/mina-sshd/issues/751

   ### Environment
   version：2.13.0
   target：centos7   openssh 7.4   sftp version 3
   client： xshell5    sftp version：3
   
   ### Phenomenon
   I wrote an sftp server using sshd-sftp, which then received a port 2202 to 
request and forwarded it to the filesystem of another target linux machine. I 
found a problem with the owner and group display during testing, as follows:
   
![Image](https://github.com/user-attachments/assets/c5c25833-5505-4246-ad78-6cc4e02cabe4)
   
   ### Attachment
   Here is my test code：
   
[sftpTestDemo.zip](https://github.com/user-attachments/files/20099028/sftpTestDemo.zip)
   
   ### Others
   AbstractSftpSubsystemHelper.writeDirEntry() 
   ```java
   protected void writeDirEntry(
           int id, DirectoryHandle dir, Map<String, Path> entries, Buffer 
buffer, int index, Path f, String shortName, LinkOption... options)
                   throws IOException {
       Map<String, ?> attrs = resolveFileAttributes(f, 
SftpConstants.SSH_FILEXFER_ATTR_ALL, options);
       entries.put(shortName, f);
   
       buffer.putString(shortName);
       int version = getVersion();
       if (version == SftpConstants.SFTP_V3) {
           String longName = getLongName(f, shortName, options);
           buffer.putString(longName);
           if (log.isTraceEnabled()) {
               log.trace("writeDirEntry(" + getServerSession() + ") id=" + id + 
")[" + index + "] - "
                       + shortName + " [" + longName + "]: " + attrs);
           }
       } else {
           if (log.isTraceEnabled()) {
               log.trace("writeDirEntry(" + getServerSession() + "(id=" + id + 
")[" + index + "] - "
                       + shortName + ": " + attrs);
           }
       }
   
       writeAttrs(buffer, attrs);
   }
   
   ```
   I found that the getLongName method always uses "owner" and "group" in 
attributes as null internally, in the sftp version 3 scenario.
   
   
   AbstractSftpClient.checkDirResponse()
   ```java
   if (version == SftpConstants.SFTP_V3) {
       longName = getReferencedName(cmd, buffer, nameIndex.getAndIncrement());
   }
   
   ```
   But I see that there is a LongName fetching, and that the data contains the 
correct owner and group information.
   
   ### Problem
   I would like to ask how to ensure that the owner and group under the sftp3 
version display properly?


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