Configuring Yarn

How to configure the Yarn package manager

This page explains how to configure the Yarn package manager to pull packages from the Seal artifact server based on your existing setup.

Make sure you have the access token for the server ready.

Configure classic Yarn (v1) to pull directly from the global yarn repository

To configure Classic Yarn it's best to use the npm configuration .npmrc files.

These configuration files can be global, per-user and per-project. We recommend using a per-project configuration, which you do by creating or editing the relevant file in your project's root directory.

Our goal is to replace https://registry.npmjs.org/ as your default registry with https://npm.sealsecurity.io/. The configuration file may still refer to other registries for privately scoped packages.

Using an .npmrc file

We want the file to look similar to this:

registry=https://npm.sealsecurity.io/
//npm.sealsecurity.io/:username=$PROJECT_ID
//npm.sealsecurity.io/:_password=$TOKEN_IN_BASE64
//npm.sealsecurity.io/:always-auth=true

The $PROJECT_ID and $TOKEN_IN_BASE64 fields

  1. In the $PROJECT_ID put the name of your project. This value will later be used in the reporting to indicate which project pulled which vulnerable package.

  2. In the $TOKEN_IN_BASE64 we need to put the base64 value of the access token. To encode the token in base64 you can use echo -n $TOKEN | base64 on Mac or echo -n $TOKEN | base64 -w0 on Ubuntu.

Note that npm decodes the _password field using base64, and while the access token looks like it's in base64 because it's a JWT token, it's in fact not a valid base64 string.

Configure Yarn v2+ to pull directly from the global yarn repository

The Yarn configuration is saved in the .yarnrc files, which can be global, per-user and per-project. We recommend using a per-project setup, which you can do by creating or editing the .yarnrc file in the project's root.

Our goal is to replace https://registry.npmjs.org/ as your default registry with https://npm.sealsecurity.io/. The configuration file may still refer to other registries for privately scoped packages. The file should end up looking like this:

npmRegistries:
  "https://npm.sealsecurity.io":
    npmAlwaysAuth: true
    npmAuthIdent: $AUTHENTICATION_STRING

npmRegistryServer: "https://npm.sealsecurity.io"

yarnPath: .yarn/releases/yarn-{yarn_version}.cjs

  1. Make sure the yarnPath is pointing to the correct Yarn version.

  2. Let $TOKEN be the access token you have for the server. And let $PROJECT_ID be the name of your project, which will later be used in the reporting to indicate which project pulled which vulnerable package.

  3. If you're using Yarn v2 replace $AUTHENTICATION_STRING with the base64 encoding of $PROJECT_ID:$TOKEN.

  4. If you're using Yarn v3+ just replace $AUTHENTICATION_STRING with "$PROJECT_ID:$TOKEN".

Pull from JFrog's Artifactory

  1. Go to JFrog's Artifactory configuration and create a new remote npm repository.

    1. In the Basic configuration, choose whatever Repository Key you like.

    2. Set https://npm.sealsecurity.io as the URL.

    3. In the User Name field use jfrog.

    4. In the Password / Access Token field paste the token you created earlier.

  2. Click the Test button. This will test whether the connection and authentication to the Seal artifact server is configured properly.

  3. Save the new repository, and set it as the top priority remote repository in the virtual repository you're using.

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