FROM alpine:3.10
ADD ./id_rsa.pub /root/.ssh/authorized_keys

RUN apk add --update openssh shadow \
&& rm -rf /rmp/* /var/cache/apk/* \ 
&& chown root:root /root/.ssh/authorized_keys \
&& chmod 700 /root/.ssh \
&& chmod 700 /root/.ssh/authorized_keys \
&& mkdir -p /var/run/sshd \
&& ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa \
&& ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa \
&& usermod -p '*' root \
&& sed -i 's/AllowTcpForwarding no/AllowTcpForwarding yes/g' /etc/ssh/sshd_config \
&& sed -i 's/GatewayPorts no/GatewayPorts yes/g' /etc/ssh/sshd_config \   
&& printf "\nMatch User root\n  AllowTcpForwarding yes\n  X11Forwarding no\n  AllowAgentForwarding no\n  ForceCommand /bin/false" >> /etc/ssh/sshd_config


EXPOSE 22
CMD ["/usr/sbin/sshd","-D"]