The below will allow sftp with no password and chroot user into users directory using jailkit.
ssh-keygen -t rsa
Copy public key to remote server:
ssh-copy-id -i ~/.ssh/id_rsa.pub username@remotehost
This puts the public keys into the remote servers home directory of the specified user. Usually inside .ssh/authorized keys. *make sure the remote user has already been added
To manually copy a key or insert a public key passed by a customer:
scp ~/.ssh/id_rsa.pub root@remoteserver:/root
2. Inside the specified users home directory create a .ssh directory
3. Create a file called authorized_keys inside .ssh
4. Insert the contents of id_rsa.pub into authorized_keys
cat /root/id_rsa.pub >> /home/userdir/.ssh/authorized_keys
This will give remote access to the remote server and drop you into the users directory
Set the specified user /bin/false e.g.
Now we need to modify the sshd_config file:
Change Subsystem sftp /usr/lib/openssh/sftp-server to
Subsystem sftp internal-sftp
*Append the following to the bottom of the file:*
Match Group sftp ChrootDirectory /path/to/directory/web AllowTCPForwarding no X11Forwarding no ForceCommand internal-sftp
Now we need to set ownership and permissions:
chown user:root /home/user chown user:root /home/user/.ssh chown user:root /home/user/.ssh/authorized_keys chmod 775 /home/user chmod 700 /home/user/.ssh chmod 600 /home/user.ssh/authorized_keys
That should be everything. Try to ssh or sftp to the remote host from the original host. You should be dropped straight into the specified directory and unable to move anywhere outside of it.