Plesk - Adding programs to a chrooted SSH

Just a few notes today about making programs (in this case git) available to a chrooted SSH account in Plesk. I'm assuming the account is already setup for ssh, etc so I will just be covering where to copy the files to.

Note: If you are here about getting an execv("/bin/bash") failed error, check Appendix B

Location

  • /usr/local/bin - The git bin files we will be copying.
  • /usr/local/share/git-core - The shared git-core files.
  • /var/www/vhosts/chroot - The base directory for chroot accessible programs.

Copying Git

Firstly you will want to locate the git files. The easiest way to do this is by typing:

which git

This should tell you the path to git (in my case /usr/local/bin) Next we want to copy the files over to the equivalent path in the chroot directory (/path/to/chroot/usr/local/bin)

cp -R /usr/local/bin/git* /var/www/vhosts/chroot/usr/local/bin

In the case of git, we also want to copy over some other files

cp -R /usr/local/share/git-core /var/www/vhosts/chroot/usr/local/share/git-core
cp -R /usr/local/libexec /var/www/vhosts/chroot/usr/local/libexec/git-core

Note: The libexec files are quite large (100's of mb) so you may want to consider doing this in a better way.

Updating chroot'd directories

The final (rather simple) step involves updating any chrooted directories that have already been created. This can be done by running the recreate_chroot_env.sh script (downloadable from http://kb.parallels.com/818)

This can also be done without the script:

/usr/local/psa/admin/sbin/chrootmng --remove --source=/var/www/vhosts/chroot --target=/var/www/vhosts/<domain name> /usr/local/psa/admin/sbin/chrootmng --create --source=/var/www/vhosts/chroot --target=/var/www/vhosts/<domain name> `

Thats it!!

Now when you login to your chrooted account you should be able to use git. I might add the required files for some more programs as I find the need to add them.

Appendix A: Files required for ftp

  • /usr/bin/ftp -> chroot/bin
  • /usr/lib64/libreadline.so.5 -> chroot/lib/libreadline.so.5
  • /usr/lib64/libncurses.so.5 -> chroot/lib/libncurses.so.5
  • /etc/services -> chroot/etc/services

Appendix B: execv("/bin/bash") failed

One cause of this occuring is due to the bin files for a chrooted directory not exisiting/being properly setup. This can be fixed by following the instructions in Updating chroot'd directories above.. or if you're too lazy to scroll (like me)

/usr/local/psa/admin/sbin/chrootmng --remove --source=/var/www/vhosts/chroot --target=/var/www/vhosts/<domain name>
/usr/local/psa/admin/sbin/chrootmng --create --source=/var/www/vhosts/chroot --target=/var/www/vhosts/<domain name>