Bastion SSH Tunneling

Tunnel

if  [[ -f ${HOME}/.ssh/config ]]&&[[ -s ${HOME}/.ssh/config ]]&&
    [[ "$(grep -c 'gtw.vpc.chorke.org' ${HOME}/.ssh/config)" == 0 ]];then
        tee -a ${HOME}/.ssh/config >/dev/null <<EOF

# bastion ssh tunnel
Host gtw.vpc.chorke.org
     HostName gtw.vpc.chorke.org
     PreferredAuthentications publickey
     IdentityFile ~/.ssh/gtw.vpc.chorke.org_rsa
     User deploy
EOF
fi

Tunneling

if [[ -f ${HOME}/.ssh/config ]]&&[[ -s ${HOME}/.ssh/config ]]&& [[ "$(grep -c 'api.vpc.chorke.org' ${HOME}/.ssh/config)" == 0 ]];then tee -a ${HOME}/.ssh/config >/dev/null <<EOF # api gateway service Host api.vpc.chorke.org HostName api.vpc.chorke.org ProxyCommand ssh -qW%h:%p gtw.vpc.chorke.org IdentityFile ~/.ssh/api.vpc.chorke.org_rsa PreferredAuthentications publickey PubkeyAcceptedKeyTypes +ssh-rsa HostKeyAlgorithms +ssh-rsa User deploy LocalForward 1983 localhost:1983 LocalForward 2013 localhost:2013 LocalForward 2015 localhost:2015 EOF fi	if [[ -f ${HOME}/.ssh/config ]]&&[[ -s ${HOME}/.ssh/config ]]&& [[ "$(grep -c 'app.vpc.chorke.org' ${HOME}/.ssh/config)" == 0 ]];then tee -a ${HOME}/.ssh/config >/dev/null <<EOF # web portal service Host app.vpc.chorke.org HostName app.vpc.chorke.org ProxyCommand ssh -qW%h:%p gtw.vpc.chorke.org IdentityFile ~/.ssh/app.vpc.chorke.org_rsa PreferredAuthentications publickey PubkeyAcceptedKeyTypes +ssh-rsa HostKeyAlgorithms +ssh-rsa User deploy LocalForward 1983 localhost:1983 LocalForward 2013 localhost:2013 LocalForward 2015 localhost:2015 EOF fi
if [[ -f ${HOME}/.ssh/config ]]&&[[ -s ${HOME}/.ssh/config ]]&& [[ "$(grep -c 'rds.vpc.chorke.org' ${HOME}/.ssh/config)" == 0 ]];then tee -a ${HOME}/.ssh/config >/dev/null <<EOF # psql database service Host rds.vpc.chorke.org HostName rds.vpc.chorke.org ProxyCommand ssh -qW%h:%p gtw.vpc.chorke.org IdentityFile ~/.ssh/rds.vpc.chorke.org_rsa PreferredAuthentications publickey PubkeyAcceptedKeyTypes +ssh-rsa HostKeyAlgorithms +ssh-rsa User deploy EOF fi	# add ssh private key to the ssh-agent ssh-add ~/.ssh/app.vpc.chorke.org_rsa ssh-add ~/.ssh/api.vpc.chorke.org_rsa ssh-add ~/.ssh/rds.vpc.chorke.org_rsa # forward ssh key to bastion ssh -A app.vpc.chorke.org ssh -A api.vpc.chorke.org ssh -A rds.vpc.chorke.org # manage ssh key from ssh-agent ssh-add -d ~/.ssh/app.vpc.chorke.org_rsa ssh-add -l ssh-add -L ssh-aad -D

Example

ssh-copy-id -i\ ${HOME}/.ssh/vpn.shahed.biz_rsa.pub [email protected]	ssh-copy-id -i\ ${HOME}/.ssh/git.shahed.biz_rsa.pub [email protected]
if [[ -f ${HOME}/.ssh/config ]]&&[[ -s ${HOME}/.ssh/config ]]&& [[ "$(grep -c 'vpn.shahed.biz' ${HOME}/.ssh/config)" == 0 ]];then tee -a ${HOME}/.ssh/config >/dev/null <<EOF # bastion proxy Host vpn.shahed.biz HostName vpn.shahed.biz IdentityFile ~/.ssh/vpn.shahed.biz_rsa PreferredAuthentications publickey PubkeyAcceptedKeyTypes +ssh-rsa HostKeyAlgorithms +ssh-rsa IdentitiesOnly yes User bastion EOF fi	if [[ -f ${HOME}/.ssh/config ]]&&[[ -s ${HOME}/.ssh/config ]]&& [[ "$(grep -c 'git.shahed.biz' ${HOME}/.ssh/config)" == 0 ]];then tee -a ${HOME}/.ssh/config >/dev/null <<EOF # gitlab jenkins Host git.shahed.biz HostName git.shahed.biz ProxyCommand ssh -qW%h:%p vpn.shahed.biz IdentityFile ~/.ssh/git.shahed.biz_rsa PreferredAuthentications publickey PubkeyAcceptedKeyTypes +ssh-rsa HostKeyAlgorithms +ssh-rsa IdentitiesOnly yes User jenkins EOF fi
if [[ -f ${HOME}/.ssh/config ]]&&[[ -s ${HOME}/.ssh/config ]]&& [[ "$(grep -c 'Host \*' ${HOME}/.ssh/config)" == 0 ]];then cat <<EOF | tee -a ${HOME}/.ssh/config >/dev/null # for all host Host * PreferredAuthentications publickey PubkeyAcceptedKeyTypes +ssh-rsa HostKeyAlgorithms +ssh-rsa ServerAliveInterval 60 ServerAliveCountMax 20 IdentitiesOnly yes AddressFamily inet Compression yes LogLevel INFO Protocol 2 EOF fi

Knowledge

sudo systemctl restart sshd sudo systemctl status ssh	grep -c '^#[ ]*GatewayPorts[ ]*\(no\|yes\|clientspecified\)$' ./sshd_config grep -c '^#[ ]*GatewayPorts[ ]*\(\(no\)\|\(yes\)\|\(clientspecified\)\)$' ./sshd_config
# regexp simple group & escaping if [[ -f /etc/ssh/sshd_config ]]&&[[ -s /etc/ssh/sshd_config ]]&& [[ "$(grep -c '#[ ]*GatewayPorts[ ]*\(no\|yes\|clientspecified\)' /etc/ssh/sshd_config)" == 1 ]];then sed -z 's/#[ ]*GatewayPorts[ ]*\(no\|yes\|clientspecified\)/GatewayPorts yes/' -i /etc/ssh/sshd_config fi
# regexp complex group & escaping if [[ -f /etc/ssh/sshd_config ]]&&[[ -s /etc/ssh/sshd_config ]]&& [[ "$(grep -c '#[ ]*GatewayPorts[ ]*\(\(no\)\|\(yes\)\|\(clientspecified\)\)' /etc/ssh/sshd_config)" == 1 ]];then sed -z 's/#[ ]*GatewayPorts[ ]*\(\(no\)\|\(yes\)\|\(clientspecified\)\)/GatewayPorts yes/' -i /etc/ssh/sshd_config fi
# add ssh private key to agent ssh-add ~/.ssh/gtw.vpc.chorke.org_rsa # forwarded private key ssh -A api.vpc.chorke.org ssh -A app.vpc.chorke.org	# manage ssh key for ssh-agent ssh-add -d ~/.ssh/gtw.vpc.chorke.org_rsa ssh-add -l ssh-add -D ssh-add -L	Too many authentication failures ssh-add -l ssh-add -D ssh-add ~/.ssh/gtw.vpc.chorke.org_rsa ssh api.vpc.chorke.org ssh app.vpc.chorke.org
too many authentication failures issue ssh -o PreferredAuthentications=password ${USER}@academia.local ssh -o IdentityAgent=none ${USER}@academia.local ssh -o IdentitiesOnly=yes ${USER}@academia.local		Host *.local IdentityAgent none IdentitiesOnly yes PreferredAuthentications password

References

SSH/Public Key Authentication Remove an SSH Key SSH Port Forwarding Ubuntu/Raspberry Pi Fedora/Raspberry Pi Fedora/Morefine Raspberry Pi OpenVPN Fedora Bash	SSH Tunneling: Examples, Command & Server Config Add Multiple Local Forward to ~/.ssh/config Add Remote Forward to ~/.ssh/config Add Local Forward to ~/.ssh/config Keys added to ssh-agent with ssh-add Grep & Regular Expressions to Search Restart ssh-agent Without Relogin Sed Replace A Multi-Line String AWS » CLI AWS	SSH server » Ubuntu » Change the default port rsync » Specify a different ssh port OpenSSL CIDR UFW