# Keyboard Interactive SSH Server
A test SSH server that uses keyboard-interactive authentication and listens on port 4444:

```Dockerfile
# Use the Debian Bullseye Slim image as the base
FROM debian:bullseye-slim

# Install the necessary packages
# Use the Debian Bullseye Slim image as the base
FROM debian:bullseye-slim

# Install the necessary packages
RUN apt-get update && \
    apt-get install htop -y --no-install-recommends \
    openssh-server && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

# Configure SSH server
RUN mkdir /var/run/sshd && \
    sed -i 's/^ChallengeResponseAuthentication no/ChallengeResponseAuthentication yes/' /etc/ssh/sshd_config && \
    echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config && \
    echo 'Port 4444' >> /etc/ssh/sshd_config && \
    echo 'UsePAM yes' >> /etc/ssh/sshd_config && \
    echo 'AuthenticationMethods keyboard-interactive' >> /etc/ssh/sshd_config

# Add a test user with a password
RUN useradd -m testuser && \
    echo "testuser:testpassword" | chpasswd

# Expose port 4444
EXPOSE 4444

# Start the SSH server
CMD ["/usr/sbin/sshd", "-D", "-e"]
```

### Instructions:

1. **Build the Docker image**:
   ```bash
   docker build -t keyboard-ssh-server .
   ```

2. **Run the container**:
   ```bash
   docker run --rm -p 4444:4444 --name keyboard-ssh-server keyboard-ssh-server
   ```

This Dockerfile sets up an SSH server that listens on port 4444 and uses keyboard-interactive authentication. The `testuser` has been created with the password `testpassword`. 

You can connect to this SSH server using the following command:

```bash
ssh -p 4444 testuser@localhost
```

You'll be prompted for a password as part of the keyboard-interactive authentication process.