Dockerfile

FROM alpine:3.13.5
LABEL maintainer="Chris Kankiewicz <Chris@ChrisKankiewicz.com>"

# Create non-root user
RUN adduser -Ds /sbin/nologin soxy

# Create key directory
RUN mkdir -pv /vol/key \
    && chown soxy:soxy -R /vol \
    && chmod 700 /vol/key

# Create Soxy SSH directory & config file
# RUN mkdir -pv /home/soxy/.ssh
COPY files/config /home/soxy/.ssh/config
RUN chown soxy:soxy -R /home/soxy/.ssh \
    && chmod 700 /home/soxy/.ssh \
    && chmod 600 /home/soxy/.ssh/config

# Create keygen command
COPY files/keygen /usr/local/bin/keygen
RUN chmod +x /usr/local/bin/keygen

# Install OpenSSH Client
RUN apk add --update openssh-client \
    && rm -rf /var/cache/apk/*

# Set running user
USER soxy

# Define volumes
VOLUME /vol/key

# Set the working dir
WORKDIR /home/soxy

# Set the entrypoint
ENTRYPOINT ["ssh", "-v", "-C", "-N", "-D", "0.0.0.0:1080"]