FROM ubuntu:latest

ENV     DEBIAN_FRONTEND=noninteractive

# Install packages
RUN     apt update && \
        apt install --no-install-recommends -y \ 
          nano \
          openssh-server \
          openssh-client \
          rsync \
          sudo && \
        rm -rf /var/lib/apt/lists/* 

# User setup
RUN     useradd -m -d /home/user -s /bin/bash -U -u 1000 user && \
        mkdir /home/user/.ssh && \
        chown -R user:user /home/user/.ssh && \
        mkdir /sftp && \
        chown root:root /sftp && \
        chmod 755 /sftp 
RUN     echo 'user:password' | chpasswd

COPY    authorized_keys /home/user/.ssh/
COPY    sshd_config ssh_host_* /etc/ssh/

RUN     chown user:user /home/user/.ssh/authorized_keys && \
        chmod 644 /home/user/.ssh/authorized_keys && \
        chown root:root /etc/ssh/* && \
        chmod 644 /etc/ssh/sshd_config && \
        chmod 600 /etc/ssh/ssh_host_ed25519_key && \
        chmod 644 /etc/ssh/ssh_host_ed25519_key.pub && \
        mkdir /run/sshd     

EXPOSE  22

CMD     ["/usr/sbin/sshd","-D","-e"]