过去几天，我一直在尝试在我的 Ubuntu 服务器上设置 chroot，但遇到了一个问题。我尝试了几种不同的方法来在 Ubuntu 上设置 chroot，包括手动设置文件夹权限，然后静态链接我想要允许的二进制文件的库，但目前我正在使用 Jailkit 来设置 chroot 环境，但这两种设置我都遇到了同样的问题，在设置 chroot 并尝试登录 ssh 后，我立即看到一个强制关闭的终端。当我运行调试 sshd 时，我发现这是因为 sshd 出于某种原因无法找到 /dev/pts，即使它在 chroot 环境中。
下面是我的设置，除 /dev/pts 外，其余均由 Jailkit 填充，/dev/pts 是使用以下方式挂载的
sudo mount -o bind /dev/pts /data/jail/dev/pts
/data/jail/home/user
/data/jail/dev
/data/jail/dev/pts
/data/jail/dev/tty
这是 debug sshd 显示的内容：
debug3: safely_chroot: checking '/'
debug3: safely_chroot: checking '/data/'
debug3: safely_chroot: checking '/data/jail/'
debug3: safely_chroot: checking '/data/jail/home/'
debug3: safely_chroot: checking '/data/jail/home/user'
Changed root directory to "/data/jail/home/user"
debug1: permanently_set_uid: 1002/1003
debug2: set_newkeys: mode 0
debug2: set_newkeys: mode 1
debug1: Entering interactive session for SSH2.
debug2: fd 6 setting O_NONBLOCK
debug2: fd 8 setting O_NONBLOCK
debug1: server_init_dispatch_20
debug3: Received SSH2_MSG_IGNORE
debug1: server_input_channel_open: ctype session rchan 256 win 16384 max 16384
debug1: input_session_request
debug1: channel 0: new [server-session]
debug2: session_new: allocate (allocated 0 max 10)
debug3: session_unused: session id 0 unused
debug1: session_new: session 0
debug1: session_open: channel 0
debug1: session_open: session 0: link with channel 0
debug1: server_input_channel_open: confirm session
debug1: server_input_channel_req: channel 0 request pty-req reply 1
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req pty-req
debug1: Allocating pty.
debug3: mm_request_send entering: type 28
debug3: mm_pty_allocate: waiting for MONITOR_ANS_PTY
debug3: mm_request_receive_expect entering: type 29
debug3: mm_request_receive entering
debug3: mm_request_receive entering
debug3: monitor_read: checking request 28
debug3: mm_answer_pty entering
debug2: session_new: allocate (allocated 0 max 10)
debug3: session_unused: session id 0 unused
debug1: session_new: session 0
debug1: SELinux support disabled
debug3: mm_request_send entering: type 29
debug3: mm_answer_pty: tty /dev/pts/8 ptyfd 5
debug1: session_pty_req: session 0 alloc /dev/pts/8
debug1: server_input_channel_req: channel 0 request shell reply 1
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req shell
Starting session: shell on pts/8 for user from *.*.*.* port 54006
debug2: fd 3 setting TCP_NODELAY
debug3: packet_set_tos: set IP_TOS 0x10
debug2: channel 0: rfd 11 isatty
debug2: fd 11 setting O_NONBLOCK
debug3: fd 9 is O_NONBLOCK
debug1: Setting controlling tty using TIOCSCTTY.
/dev/pts/8: No such file or directory
open /dev/tty failed - could not set controlling tty: No such file or directory
debug3: mm_request_receive entering
debug3: monitor_read: checking request 156
debug3: mm_answer_consolekit_register entering
debug1: session_by_tty: session 0 tty /dev/pts/8
debug1: Unable to open session: The name org.freedesktop.ConsoleKit was not provided by any .service files
答案1
据我所知，ChrootDirectory设置不正确。
应将其设置为：
ChrootDirectory /data/jail