chrooted sftp only 
Wednesday, August 5, 2009, 13:01 - Network, Security
Posted by Administrator
useradd -s /bin/false -m SFTPUSER
mkdir /home/SFTPUSER/.ssh
ssh-keygen -t rsa -b 2048 -N '' -f /home/SFTPUSER/.ssh/id_rsa
chown -R SFTPUSER:SFTPUSER /home/SFTPUSER/.ssh
chmod 600 /home/SFTPUSER/.ssh/id_rsa

/etc/ssh/sshd_config:
Subsystem       sftp    internal-sftp

Match user SFTPUSER
    PasswordAuthentication no
    AllowTcpForwarding no
    X11Forwarding no
    ForceCommand internal-sftp
    ChrootDirectory /chroot
chown root:root /chroot
mkdir /chroot/SFTPUSERDIR
chown SFTPUSER:SFTPUSER /chroot/SFTPUSERDIR

echo "put FILENAME" | \
sftp -oIdentityFile=/home/SFTPUSER/.ssh/id_rsa \
     -oTCPKeepAlive=no -oServerAliveInterval=15 \
     SFTPUSER@localhost:SFTPUSERDIR


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