rssh is a restricted shell for providing limited access to a host via ssh. It also allows system wide configuration and per user configuration. From the man page:
The user configuration directive allows for the configuration of options on a per-user basis. THIS KEYWORD OVERRIDES ALL OTHER KEYWORDS FOR THE SPECIFIED USER. That is, if you use a user keyword for user foo, then foo will use only the settings in that user line, and not any of the settings set with the keywords above. The user keywordâ€™s argument consists of a group of fields separated by a colon (:), as shown below. The fields are, in order:
- username : The username of the user for whom the entry provides options
- umask : The umask for this user, in octal, just as it would be specified to the shell access bits. Five binary digits, which indicate whether the user is allowed to use rsync, rdist, cvs, sftp, and scp, in that order. One means the command is allowed, zero means it is not.
- path : The directory to which this user should be chrooted (this is not a command, it is a directory name).
rssh examples of configuring per-user options
Open /etc/rssh.conf file:
# vi /etc/rssh.conf
All user tom to bypass our chroot jail:
Provide jerry cvs access with no chroot:
Provide spike rsync access with no chroot:
Provide tyke access with chroot jail located at /users
user="tyke:011:00001:/users" # whole user string can be quoted
if your chroot_path contains spaces, it must be quoted. Provide nibbles scp access with chroot directory:
user=nibbles:011:00001:"/usr/local/tv/shows/tom and jerry"