The below Docker file creates an image with the customization you described, such as enforcing password authentication for the ls command and setting up a custom sudoers file. However, it's important to note that modifying system commands ls and using unconventional security practices might have unintended consequences and potentially introduce security vulnerabilities.
# Use the official Ubuntu base image
FROM ubuntu:latest
# Set environment variables for the new user and password
ENV USER_NAME=myuser
ENV USER_PASS=mypassword
# Create a new user and set the password
RUN useradd -m $USER_NAME && \
echo "$USER_NAME:$USER_PASS" | chpasswd
# Install sudo and create a custom sudoers file to require password authentication
RUN apt-get update && \
apt-get install -y sudo && \
rm -rf /var/lib/apt/lists/* && \
echo "$USER_NAME ALL=(ALL:ALL) ALL, !/bin/bash" > /etc/sudoers.d/custom_sudoers && \
chmod 0440 /etc/sudoers.d/custom_sudoers
# Create a custom shell script to enforce password authentication for ls
RUN echo '#!/bin/bash\nsudo /bin/ls "$@"' > /usr/local/bin/ls && \
chmod +x /usr/local/bin/ls
# Add /usr/local/bin to the beginning of PATH
ENV PATH="/usr/local/bin:${PATH}"
# Set the default user to the newly created user
USER $USER_NAME
# Set the working directory to the user's home directory
WORKDIR /home/$USER_NAME
# Start a shell when running the container
CMD ["/bin/bash"]
The provided Docker file describes the steps to create a custom Docker image based on the official Ubuntu image. It creates a new user, sets a password, installs sudo, and customizes sudoers and the ls command. Let’s break down the Docker file step by step:
FROM ubuntu:latestThis sets the base image to the latest version of Ubuntu.
Setting environment variables for the new user and password:
ENV USER_NAME=myuser
ENV USER_PASS=mypassword
3. Creating a new user and setting the password:
RUN useradd -m $USER_NAME && \
echo "$USER_NAME:$USER_PASS" | chpasswd
4. Installing sudo and creating a custom sudoers file:
RUN apt-get update && \
apt-get install -y sudo && \
rm -rf /var/lib/apt/lists/* && \
echo "$USER_NAME ALL=(ALL:ALL) ALL, !/bin/bash" > /etc/sudoers.d/custom_sudoers && \
chmod 0440 /etc/sudoers.d/custom_sudoers
5. Creating a custom shell script to enforce password authentication for the ls command:
RUN echo '#!/bin/bash\nsudo /bin/ls "$@"' > /usr/local/bin/ls && \
chmod +x /usr/local/bin/ls
6. Adding /usr/local/bin to the beginning of the PATH:
ENV PATH="/usr/local/bin:${PATH}"
7. Setting the default user to the newly created user:
USER $USER_NAME
8. Setting the working directory to the user’s home directory:
WORKDIR /home/$USER_NAME
9. Starting a shell when running the container:
CMD ["/bin/bash"]
This Docker file creates an image with the customization you described, such as enforcing password authentication for the ls command and setting up a custom sudoers file. However, it's important to note that modifying system commands ls and using unconventional security practices might have unintended consequences and potentially introduce security vulnerabilities.
