Q. What is rssh ?

Ans: rssh is a restricted shell for use with OpenSSH, allowing only scp or sftp. It now also includes support for rdist, rsync, & cvs. For example, if you have a server which you only want to allow users to copy files off of via scp, without providing shell access, you can use rssh to do that.rssh is a Restricted Shell for Providing Limited Access to a host via ssh, it allows following Operations only :

1. scp - Secure file copy
2. sftp - Secure FTP
3. cvs - Concurrent Versions System ~ you can easily retrieve old versions to see exactly which change caused the bug
4. rsync - Backup & sync file system
5. rdist - Backup / RDist program maintains identical copies of files on multiple hosts.

Step: 1. Install rssh :

For CentOS :

# cd /tmp
# wget http://dag.wieers.com/rpm/packages/rssh/rssh-2.3.2-1.2.el5.rf.i386.rpm
# yum -y install rssh-2.3.2-1.2.el5.rf.i386.rpm

For Ubuntu :

# apt-get -y install rssh

Step: 2. Grant Access to SFTP & SCP for all Users by Appending :

Note: By default rssh locks down everything including any sort of access.

# vi /etc/rssh.conf

Uncommented:

allowscp
allowsftp

-- Save & Quit (:wq)

Step: 3. Restart the SSHD Service :

# service sshd restart

Step: 4. Create A New User with "/usr/bin/rssh" shell :

# useradd -m -d /var/www/html/koushik.com -s /usr/bin/rssh koushik
# passwd koushik

New password:
Retype new password:

Step: 5. Change User's Shell bash to rssh :

# usermod -s /usr/bin/rssh user_name
or
# chsh -s /usr/bin/rssh user_name

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