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+- Start Date: 2016-10-11
+- RFC PR:
+- Yarn Issue:
+
+# Summary
+
+Add the ability to install from and authenticate against an alternative
+registry, via the environment variables `YARN_AUTH_TOKEN`, `YARN_REGISTRY`,
+and the `.yarnrc` settings `registry`, and `token`.
+
+# Motivation
+
+Services like npm, Artifactory, and Sinopia allow users to develop private
+JavaScript dependencies using the same tools and workflows used for open-source development. To be able to install from these alternative registries, yarn needs to be able to provide an authentication token and to be able to point to an alternative
+registry URL. To be able to support private dependencies in a CI environment, it must be possible to provide authentication without manual intervention, e.g., having a user login before each authenticated install.
+
+It is becoming a popular practice in the JavaScript world to automatically publish
+a package once builds pass in CI, see ([Travis CI Deployment](https://docs.travis-ci.com/user/deployment),
+[semantic-release](https://github.com/semantic-release/semantic-release)).
+To facilitate this, it would be useful to be able to publish from the yarn
+client without needing to manually authenticate.
+
+Supporting both these use-cases would allow JavaScript developers to more easily use Yarn to
+develop private using private dependencies in a CI environment.
+
+# Detailed design
+
+## authenticating JSON requests
+
+If the upstream JSON meta-information request is being made to a registry
+matching `YARN_REGISTRY`, or `registry` in `.yarnrc`, then the
+authentication header would be populated with the corresponding `YARN_TOKEN`, or `token` in `.yarnrc`.
+
+## authenticating tarball requests
+
+If their base URL matches the URL configured in `YARN_REGISTRY`, the requests for upstream tarballs would also have the authentication header populated.
+
+## mitigating publication security concerns
+
+In order to prevent a publication attack, such as the attack discussed in [this article](http://www.infoworld.com/article/3048526/security/nodejs-alert-google-engineer-finds-flaw-in-npm-scripts.html), we could introduce an additional configuration variable, e.g., `YARN_REAUTH_PUBLISHES`/`auth_publishes`, which would require that users re-enter credentials
+to publish a module; file permissions could be used to prevent lifecycle-scripts
+from updating this setting in `.yarnrc`.
+
+# How We Teach This
+
+## Glossary of Terms
+
+* **auth_token**: the opaque authentication token provided by npm (and other registry
+   implementations) after a successful login.
+* **registry**: the remote location hosting package meta-information and package tarballs.
+* **private package**: a package stored on a remote registry, that requies authentication
+  to install it.
+* **publication**: the process of publishing either a public or private package to a registry.
+  Requires authentication in both use-cases.
+
+## Add section to documentation about installing private dependencies
+
+A section should be added to the yarn documentation, discussing how to add an
+authentication token to `.yarnrc` and how to configure yarn to speak to
+alternative registries.
+
+## Add section to documentation about using yarn in a CI environment
+
+It would be worth adding an additional section to the yarn documentation,
+discussing how to configure a few common CI environments, e.g., Travis CI. It has
+been my experience that the process of auto-generating configuration, for instance an
+appropriate `.yarnrc` file, often trips people up.
+
+## Add section to documentation about security
+
+A section should be added to documentation discussing the security concerns surrounding
+headless publication; with some approaches to mitigating these concerns. And a discussion
+of the importance of keeping your `auth_token` secret.
+
+# Drawbacks
+
+## security!
+
+There are inarguably some security concerns with giving yarn the ability to install
+and publish modules in a headless CI environment. I believe this concern can be
+partially mitigated by introducing a setting like `reauth_publishes`, and with
+appropriate configuration of the read/write permissions on the local `.yarnrc` file.
+
+The default behavior could require authentication for publishes, while providing
+the ability for a CI environment to perform a headless publication; it's worth noting that sandboxed CI environments are less at risk to a worm-attack than a user's local
+machine, which tends to have a large number of repositories cloned to it.
+
+## no support for multiple registries
+
+In the current `.npmrc` file format, multiple registries and API tokens can be configured:
+
+```
+//32.237.243.48:8081/:_authToken=e8c0bbbe-aaaa-4b59-8275-8784a592afaa
+//44.237.243.48:8080/:_authToken=29958a1f-bbbb-4f6f-9d37-7e61676293bb
+//99.86.144.137:8080/:_authToken=7d3a257b-2222-4d20-b43a-7ca2f58b2299
+```
+
+The implementation proposed in this document would only support one registry/token.
+
+# Alternatives
+
+## support headless private installs but not publications
+
+To mitigate the threat of a worm we could support headless authenticated installs,
+while continuing to always require that a user authenticate during publication.
+
+## support `.yarnrc` configuration but not environment variables
+
+It's easier to prevent lifecycle scripts from writing to `.yarnrc`, then it would be
+to prevent lifecycle scripts from reading from and populating environment variables --
+perhaps we support configuration in `.yarnrc`, but not environment variables.
+
+## handle multiple registries and scopes
+
+Perhaps rather than building an MVP that supports only a single registry with an
+authentication token, we should support the more complex use-case handled by `.npmrc`:
+
+* an authentication token can be provided for each registry URL.
+* multiple scopes (`@mycompany`) can be associated with multiple registries.