continuous integration - Docker: Using --password via the CLI is insecure. Use --password-stdin

Continuous integration - Docker: Using --password via the CLI is insecure. Use --password-stdin

When working with Docker, passing sensitive information like passwords directly via the command line (--password) is considered insecure because the password can be visible in the command history and may be exposed in other ways. Instead, Docker provides the --password-stdin option, which allows you to pass the password securely via stdin.

Here's how you can use --password-stdin:

  1. Prepare a File with the Password: Store your password in a file. Let's say the file is named password.txt.

  2. Use --password-stdin with docker login: Pass the password securely to Docker using --password-stdin option along with docker login command.

    cat password.txt | docker login --username your_username --password-stdin

    Replace your_username with your Docker Hub username. This command reads the password from the password.txt file and passes it securely to Docker.

By using --password-stdin, the password is not exposed in the command-line arguments and is therefore more secure. This is especially important when dealing with automated scripts or continuous integration pipelines where security is a concern.

Examples

  1. "Docker login using --password-stdin in CI/CD pipelines"

    • Description: This query focuses on securely logging into Docker Hub within a CI/CD pipeline using the --password-stdin flag to avoid exposing passwords in command history.
    • Code:
      echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
      • Store your Docker username and password in environment variables DOCKER_USERNAME and DOCKER_PASSWORD. The password is piped into the docker login command using --password-stdin.

  2. "Securely authenticate Docker in Jenkins pipeline"

    • Description: This query looks at securely managing Docker authentication within Jenkins pipelines.
    • Code:
      withCredentials([string(credentialsId: 'docker-password', variable: 'DOCKER_PASSWORD')]) { sh 'echo $DOCKER_PASSWORD | docker login -u $DOCKER_USERNAME --password-stdin' }
      • Use Jenkins' credentials plugin to securely inject the Docker password into the pipeline and login securely.

  3. "GitLab CI Docker login using --password-stdin"

    • Description: This query is about securely logging into Docker within a GitLab CI pipeline.
    • Code:
      image: docker:latest services: - docker:dind variables: DOCKER_DRIVER: overlay2 before_script: - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" --password-stdin $CI_REGISTRY build: script: - docker build -t my-image .
      • Use GitLab CI environment variables CI_REGISTRY_USER and CI_REGISTRY_PASSWORD to securely login to Docker registry.

  4. "CircleCI Docker login using --password-stdin"

    • Description: This query covers securely logging into Docker Hub within a CircleCI configuration.
    • Code:
      version: 2.1 jobs: build: docker: - image: circleci/python:3.7 steps: - setup_remote_docker - run: name: Docker Login command: echo $DOCKER_PASSWORD | docker login -u $DOCKER_USERNAME --password-stdin - run: name: Build Docker Image command: docker build -t my-image .
      • Store Docker credentials as environment variables in CircleCI and login using --password-stdin.

  5. "Docker login with --password-stdin in GitHub Actions"

    • Description: This query focuses on using --password-stdin for Docker login within GitHub Actions workflows.
    • Code:
      name: Build and Push Docker Image on: push: branches: - main jobs: build: runs-on: ubuntu-latest steps: - name: Checkout code uses: actions/checkout@v2 - name: Login to Docker Hub run: echo ${{ secrets.DOCKER_PASSWORD }} | docker login -u ${{ secrets.DOCKER_USERNAME }} --password-stdin - name: Build Docker image run: docker build -t my-image .
      • Use GitHub Secrets to store Docker credentials securely and login using --password-stdin.

  6. "Automating Docker login in Azure DevOps pipelines"

    • Description: This query is about securely automating Docker login in Azure DevOps pipelines.
    • Code:
      pool: vmImage: 'ubuntu-latest' steps: - task: DockerInstaller@0 - script: echo $(dockerPassword) | docker login -u $(dockerUsername) --password-stdin env: dockerPassword: $(DOCKER_PASSWORD) dockerUsername: $(DOCKER_USERNAME) - script: docker build -t my-image .
      • Use Azure DevOps pipeline secrets to store Docker credentials and login using --password-stdin.

  7. "Using --password-stdin for Docker login in Travis CI"

    • Description: This query covers securely logging into Docker within Travis CI using the --password-stdin flag.
    • Code:
      language: generic services: - docker before_script: - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin script: - docker build -t my-image .
      • Store Docker credentials in Travis CI environment variables and login using --password-stdin.

  8. "Kubernetes Docker login with --password-stdin in CI"

    • Description: This query addresses securely logging into Docker within a Kubernetes CI/CD pipeline.
    • Code:
      apiVersion: v1 kind: Secret metadata: name: docker-registry-secret data: .dockerconfigjson: $(echo -n '{"auths":{"https://index.docker.io/v1/":{"username":"'$DOCKER_USERNAME'","password":"'$DOCKER_PASSWORD'"}}}' | base64 -w 0) type: kubernetes.io/dockerconfigjson
      • Create a Kubernetes secret for Docker registry using a base64-encoded .dockerconfigjson.

  9. "Docker login in Bitbucket Pipelines using --password-stdin"

    • Description: This query focuses on securely logging into Docker within Bitbucket Pipelines using --password-stdin.
    • Code:
      pipelines: default: - step: script: - echo $DOCKER_PASSWORD | docker login -u $DOCKER_USERNAME --password-stdin - docker build -t my-image .
      • Store Docker credentials in Bitbucket Pipelines environment variables and login using --password-stdin.

  10. "Securing Docker login in Bamboo CI/CD"

    • Description: This query looks at securely managing Docker authentication in Bamboo CI/CD pipelines.
    • Code:
      #!/bin/bash echo ${bamboo.docker.password} | docker login -u ${bamboo.docker.username} --password-stdin docker build -t my-image .
      • Use Bamboo's variable substitution to securely pass Docker credentials and login using --password-stdin.

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