#NPM CONFIG SET REGISTRY TO DEFAULT HOW TO#
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Build the example Docker image with docker build.

npmrc tokens from layers in your Docker images: Here’s how an attacker or third-party could steal.

#NPM CONFIG SET REGISTRY TO DEFAULT CODE#

These third parties need your private source code but they do not need your npm tokens. You might distribute these Docker images to contractors, consultants, and customers though. You likely won’t publish Docker images with private source code to public Docker registries. To view the layers of your Docker image an attacker would need to either compromise your Docker daemon or obtain a copy of your Docker image. npmrc file is stored in the layer created by the RUN echo '///:_authToken=$NPM_TOKEN' >. Unfortunately, each RUN instruction creates a separate layer (also called intermediate image) in a Docker image. If an attacker compromised your Docker container they would not be able to steal your npm token. npmrc file from the top layer of your Docker image and from any containers. For example:įortunately, this does remove the.

#NPM CONFIG SET REGISTRY TO DEFAULT INSTALL#

npmrc file after running npm install in your Dockerfile. npmrc files in Docker intermediate images Stealing npm tokens from a running Docker container #2 - Leaving. npmrc file in the /private-app directory. We need to use ash instead of bash since we’re running Alpine Linux.

Run docker run -it insecure-app-1 ash to start the container.

If an attacker compromises your Docker container or manages to execute arbitrary commands on your application servers, they can steal your npm tokens by running ls -al & cat. f Dockerfile-insecure-1 -t insecure-app-1 -build-arg NPM_TOKEN=$NPM_TOKEN.

Run export NPM_TOKEN= to set this token as an environment variable.

Run npm token create -read-only to create a read only npm token.

To build it locally, first clone the companion GitHub repository at then: npmrc file using an NPM_TOKEN environment variable that we pass in as a build argument ( ARG NPM_TOKEN). npmrc file but fail to delete it after running npm install: It will exist on the file system of any Docker container you create from that image.

npmrc file from your Dockerfile, it will be saved in your Docker image.

I have revoked all npm tokens featured in all screenshots. I also created a companion GitHub repository for this blog post so you can follow along with my examples. The concepts I cover apply to any Dockerfile that uses tokens, passwords, or other secrets though. This blog post focuses on using Docker with Node.js and npm. Finally, I’ll explain how multi-stage builds enable you to securely use.

For each scenario, I’ll show how an attacker can exploit it to steal your npm access tokens. In this blog post, I’ll first describe the common ways people use. This enables us to npm install our private packages in earlier build stages without leaking our tokens in the final image. Only the intermediate images and commit history from the last build stage end up in our final Docker image. Multi-stage builds allow us to securely use. In fairness, most of these resources date from before Docker shipped multi-stage builds in Docker v17.05 in May 2017. npmrc files from intermediate images or npm tokens from the image commit history though.

#NPM CONFIG SET REGISTRY TO DEFAULT HOW TO#

Many of these guides don’t cover how to remove. npmrc files from your Dockerfile after installing private npm packages. Most blog posts, Stack Overflow answers, and documentation recommend you delete. npmrc file contains a token with read/write access to your private npm packages.

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npmrc files ( npm config files) to download private npm packages. I recently completed a security audit of Docker images for a project. I recommend reading that post after this one! Building Docker images with private npm packages On February 24th, 2019 I published a follow-up post about using Docker build secrets instead of multi-stage builds. npmrc files in Docker images Jun 25, 2018

Npm config set registry to default