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secure shell…
Generate a (4096 bits long) private+public -key-pair on the local machine. To generate a key without password, just press enter:
ssh-keygen -b 4096
Find the public key in ~/.ssh/id_rsa.pub
To login on a remote machine without password, you need to add the public key to the file ~/.ssh/authorized_keys on that box.
less ~/.ssh/id_rsa.pub # copy this
.. on the remote machine:
nano ~/.ssh/authorized_keys # paste key in **ONE** line
Another option is to use the following command to add the key to authorized_keys on the remote machine:
ssh-copy-id -i .ssh/id_rsa.pub user@remoteserver
encrypt your key with passphrase, but enter phrase only once per session
http://www.funtoo.org/Keychain
add / change key passphrase:
cd ~/.ssh/ ls ssh-keygen -f id_rsa -p
setup keychain:
sudo apt-get install keychain
add keychain to ~/.bash_profile
eval `keychain --eval --agents ssh --clear id_rsa`
everytime you login, keychain will ask for your passphrase and re-use it for all logins:
source ~/.bash_profile
this creates a tunnel from local port 4950 to port 4949 on the remote machine, using a socket
ssh -L 4950:localhost:4949 -f -N -p222 -M -S /var/run/ssh_tunnel1.sock -o ExitOnForwardFailure=yes root@re.mo.te.IP
Mount remote directories (for all users and reconnect, if network is interrupted)
Install:
apt-get install sshfs
Mount:
sshfs -p 222 root@server:/path/ /mnt/server -o allow_other -o reconnect
vsftp server is not required to run a sftp server - openssh handles it.
setup is tricky: permissions of dirs are very important!
/etc/ssh/sshd_config:
#Subsystem sftp /usr/lib/openssh/sftp-server Subsystem sftp internal-sftp #... Match group sftp ChrootDirectory /var/www/%u X11Forwarding no AllowTcpForwarding no ForceCommand internal-sftp
add group and user:
groupadd sftp useradd -g sftp -d /var/www/user/ -s /sbin/nologin user passwd user
set permissions, chown to root:
chown root:root /var/www/ # basedir must belong to root chmod 0755 /var/www/ chown root:root /var/www/user/ #root not only for for parent!
“Their home directory must be owned as root and not writable by another user or group. This includes the path leading to the directory” https://wiki.archlinux.org/index.php/SFTP_chroot