Docker Password Authentication

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.

Krishna Neupane

Krishna Neupane

Docker Password Authentication