我在 ubuntu 上的 USB 上存储的文件夹上配置 sftp chroot Jail 时遇到问题。我有一个东芝 4tb 外部硬盘，它是通过路径自动安装fstab的/sftp。
UUID={UUID} /sftp ext4 auto,defaults,nofail,rw 0 0
我已按照所有必要的步骤来配置 sftp 监狱
sudo groupadd sftponly
sudo useradd -g sftponly -s /bin/false -m -d /sftp/backupsftp backupsftp
sudo passwd backupsftp
sudo chown root: /sftp/backupsftp
sudo chmod 755 /sftp/backupsftp
sudo mkdir /sftp/backupsftp/backup
sudo chmod 755 /sftp/backupsftp/backup
sudo chown backupsftp:sftponly /sftp/backupsftp/backup
/etc/ssh/sshd_config然后添加到文件底部
Match Group sftponly
ChrootDirectory %h
ForceCommand internal-sftp
AllowTcpForwarding no
X11Forwarding no
Match all
并设置以下值（始终在/etc/ssh/sshd_config文件中）：
Subsystem sftp internal-sftp
Port 22
AddressFamily inet
ListenAddress 0.0.0.0
PermitRootLogin no
StrictModes yes
最后我重新启动了服务：
sudo systemctl restart ssh
sudo systemctl restart sshd
当我尝试连接 WinScp 时出现此错误：
Linux syslogs:
Jun 24 14:46:53 bbserver systemd[1]: Created slice User Slice of backupsftp.
Jun 24 14:46:53 bbserver systemd[1]: Starting User Manager for UID 1005...
Jun 24 14:46:53 bbserver systemd[1]: Started Session 1350 of user backupsftp.
Jun 24 14:46:53 bbserver systemd[13303]: gpgconf: running /usr/bin/gpg-agent failed (exitcode=2): General error
Jun 24 14:46:53 bbserver systemd[13303]: gpgconf: fatal error (exit status 1)
Jun 24 14:46:53 bbserver systemd[13303]: Reached target Timers.
Jun 24 14:46:53 bbserver systemd[13303]: Listening on GnuPG network certificate management daemon.
Jun 24 14:46:53 bbserver systemd[13303]: Listening on GnuPG cryptographic agent and passphrase cache (access for web browsers).
Jun 24 14:46:53 bbserver systemd[13303]: Listening on REST API socket for snapd user session agent.
Jun 24 14:46:53 bbserver systemd[13303]: Listening on GnuPG cryptographic agent and passphrase cache (restricted).
Jun 24 14:46:53 bbserver systemd[13303]: Listening on GnuPG cryptographic agent (ssh-agent emulation).
Jun 24 14:46:53 bbserver systemd[13303]: Listening on GnuPG cryptographic agent and passphrase cache.
Jun 24 14:46:53 bbserver systemd[13303]: Reached target Sockets.
Jun 24 14:46:53 bbserver systemd[13303]: Reached target Paths.
Jun 24 14:46:53 bbserver systemd[13303]: Reached target Basic System.
Jun 24 14:46:53 bbserver systemd[13303]: Reached target Default.
Jun 24 14:46:53 bbserver systemd[13303]: Startup finished in 42ms.
Jun 24 14:46:53 bbserver systemd[1]: Started User Manager for UID 1005.
Jun 24 14:46:54 bbserver systemd[1]: Stopping User Manager for UID 1005...
Jun 24 14:46:54 bbserver systemd[13303]: Stopped target Default.
Jun 24 14:46:54 bbserver systemd[13303]: Stopped target Basic System.
Jun 24 14:46:54 bbserver systemd[13303]: Stopped target Timers.
Jun 24 14:46:54 bbserver systemd[13303]: Stopped target Sockets.
Jun 24 14:46:54 bbserver systemd[13303]: Closed GnuPG cryptographic agent (ssh-agent emulation).
Jun 24 14:46:54 bbserver systemd[13303]: Closed GnuPG cryptographic agent and passphrase cache.
Jun 24 14:46:54 bbserver systemd[13303]: Closed REST API socket for snapd user session agent.
Jun 24 14:46:54 bbserver systemd[13303]: Closed GnuPG network certificate management daemon.
Jun 24 14:46:54 bbserver systemd[13303]: Closed GnuPG cryptographic agent and passphrase cache (access for web browsers).
Jun 24 14:46:54 bbserver systemd[13303]: Closed GnuPG cryptographic agent and passphrase cache (restricted).
Jun 24 14:46:54 bbserver systemd[13303]: Stopped target Paths.
Jun 24 14:46:54 bbserver systemd[13303]: Reached target Shutdown.
Jun 24 14:46:54 bbserver systemd[13303]: Starting Exit the Session...
Jun 24 14:46:54 bbserver systemd[13303]: Received SIGRTMIN+24 from PID 13381 (kill).
Jun 24 14:46:54 bbserver systemd[1]: Stopped User Manager for UID 1005.
Jun 24 14:46:54 bbserver systemd[1]: Removed slice User Slice of backupsftp.
一切工作正常如果主目录创建的用户驻留在主磁盘上而不是 USB 上
更新：
/sftp文件夹权限：
drwxrwxr-x 4 root root 4096 Jun 30 14:15 sftp/
sshd logs:
Jun 30 14:25:24 bbserver sshd[2429]: Accepted password for backupsftp from 192.168.0.62 port 65380 ssh2
Jun 30 14:25:24 bbserver sshd[2429]: pam_unix(sshd:session): session opened for user backupsftp by (uid=0)
Jun 30 14:25:24 bbserver systemd-logind[1106]: New session 76758 of user backupsftp.
Jun 30 14:25:24 bbserver systemd: pam_unix(systemd-user:session): session opened for user backupsftp by (uid=0)
Jun 30 14:25:25 bbserver sshd[2559]: fatal: bad ownership or modes for chroot directory component "/sftp/"
Jun 30 14:25:25 bbserver sshd[2429]: pam_unix(sshd:session): session closed for user backupsftp
Jun 30 14:25:25 bbserver systemd-logind[1106]: Removed session 76758.