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I not only want to transmit files via sftp, but also want to log in via ssh.

Here is what I changed in sshd_config

Match Group ssh_jail
    ChrootDirectory /mnt/chroot

I have mounted /mnt/chroot/dev, /mnt/chroot/dev/pts, /mnt/chroot/proc, /mnt/chroot/sys I have also copied bash to /mnt/chroot/bin and some lib files to /mnt/chroot/lib64

But I cannot log in via ssh. Below is what I found in /var/log/secure

Accepted password for xxx from ::1 port 53069 ssh2
pam_unix(sshd:session): session opened for user xxx by (uid=0)
error: mm_receive_fd: no message header
fatal: mm_pty_allocate: receive fds failed
pam_unix(sshd:session): session closed for user xxxx

Why is that?

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  • You copied "some" lib files. Did you copy enough lib files? Have you tried chroot /mnt/chroot /bin/bash -i to see if bash works in your chroot?
    – DerfK
    Apr 4, 2013 at 16:26
  • @DerfK bash works. Lib files are enough I think.
    – yylyyl
    Apr 4, 2013 at 16:41
  • Not necessarily. What did you use to tell you the library files to copy? Did you run ldd on the sshd binary and verify that all of those are present? The failure to allocate a pty (pseudo-terminal) is rather suspect.
    – Andrew B
    Apr 4, 2013 at 22:24

1 Answer 1

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I disabled SELinux and rebooted, then everything works fine now.

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