Which internal-sftp options are available?

I had to create a chroot environment in a RHEL 6 box and I used the internal-sftp server of OpenSSH. The following OpenSSH configuration lines are working:

# override default of no subsystems
#Subsystem sftp /usr/libexec/openssh/sftp-server
Subsystem sftp internal-sftp
Match User jaileduser ChrootDirectory %h X11Forwarding no AllowTcpForwarding no
# ForceCommand internal-sftp -d /xxx

But, by googling this issue, I realized that internal-sftp has some options, like -d, but I have found no information/help about its options/arguments and their meanings in the manual pages.

Then I downloaded OpenSSH 5.6p1 source code, hoping it would be easy to find those options. But it appears to be harder than I ever thought. I found this in the Changelog file

 - 2008/08/21 04:09:57 [session.c] allow ForceCommand internal-sftp with arguments. based on patch from michael.barabanov AT gmail.com; ok markus@

Do anybody can tell me where I can find this info?

Thanks in advance

1 Answer

The internal-sftp supports the same set of options as the sftp-server: