113 lines
5 KiB
Markdown
113 lines
5 KiB
Markdown
---
|
|
stage: none
|
|
group: unassigned
|
|
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/product/ux/technical-writing/#assignments
|
|
---
|
|
|
|
# Security
|
|
|
|
## Resources
|
|
|
|
[Mozilla's HTTP Observatory CLI](https://github.com/mozilla/http-observatory-cli) and
|
|
[Qualys SSL Labs Server Test](https://www.ssllabs.com/ssltest/analyze.html) are good resources for finding
|
|
potential problems and ensuring compliance with security best practices.
|
|
|
|
<!-- Uncomment these sections when CSP/SRI are implemented.
|
|
### Content Security Policy (CSP)
|
|
|
|
Content Security Policy is a web standard that intends to mitigate certain
|
|
forms of Cross-Site Scripting (XSS) as well as data injection.
|
|
|
|
Content Security Policy rules should be taken into consideration when
|
|
implementing new features, especially those that may rely on connection with
|
|
external services.
|
|
|
|
GitLab's CSP is used for the following:
|
|
|
|
- Blocking plugins like Flash and Silverlight from running at all on our pages.
|
|
- Blocking the use of scripts and stylesheets downloaded from external sources.
|
|
- Upgrading `http` requests to `https` when possible.
|
|
- Preventing `iframe` elements from loading in most contexts.
|
|
|
|
Some exceptions include:
|
|
|
|
- Scripts from Google Analytics and Matomo if either is enabled.
|
|
- Connecting with GitHub, Bitbucket, GitLab.com, etc. to allow project importing.
|
|
- Connecting with Google, Twitter, GitHub, etc. to allow OAuth authentication.
|
|
|
|
We use [the Secure Headers gem](https://github.com/twitter/secureheaders) to enable Content
|
|
Security Policy headers in the GitLab Rails app.
|
|
|
|
Some resources on implementing Content Security Policy:
|
|
|
|
- [MDN Article on CSP](https://developer.mozilla.org/en-US/docs/Web/Security/CSP)
|
|
- [GitHub's CSP Journey on the GitHub Engineering Blog](https://github.blog/2016-04-12-githubs-csp-journey/)
|
|
- The Dropbox Engineering Blog's series on CSP: [1](https://blogs.dropbox.com/tech/2015/09/on-csp-reporting-and-filtering/), [2](https://blogs.dropbox.com/tech/2015/09/unsafe-inline-and-nonce-deployment/), [3](https://blogs.dropbox.com/tech/2015/09/csp-the-unexpected-eval/), [4](https://blogs.dropbox.com/tech/2015/09/csp-third-party-integrations-and-privilege-separation/)
|
|
|
|
### Subresource Integrity (SRI)
|
|
|
|
Subresource Integrity prevents malicious assets from being provided by a CDN by
|
|
guaranteeing that the asset downloaded is identical to the asset the server
|
|
is expecting.
|
|
|
|
The Rails app generates a unique hash of the asset, which is used as the
|
|
asset's `integrity` attribute. The browser generates the hash of the asset
|
|
on-load and will reject the asset if the hashes do not match.
|
|
|
|
All CSS and JavaScript assets should use Subresource Integrity.
|
|
|
|
Some resources on implementing Subresource Integrity:
|
|
|
|
- [MDN Article on SRI](https://developer.mozilla.org/en-us/docs/web/security/subresource_integrity)
|
|
- [Subresource Integrity on the GitHub Engineering Blog](https://github.blog/2015-09-19-subresource-integrity/)
|
|
|
|
-->
|
|
|
|
## Including external resources
|
|
|
|
External fonts, CSS, and JavaScript should never be used with the exception of
|
|
Google Analytics and Matomo - and only when the instance has enabled it. Assets
|
|
should always be hosted and served locally from the GitLab instance. Embedded
|
|
resources via `iframes` should never be used except in certain circumstances
|
|
such as with reCAPTCHA, which cannot be used without an `iframe`.
|
|
|
|
## Avoiding inline scripts and styles
|
|
|
|
In order to protect users from [XSS vulnerabilities](https://en.wikipedia.org/wiki/Cross-site_scripting), we intend to disable
|
|
inline scripts in the future using Content Security Policy.
|
|
|
|
While inline scripts can make something easier, they're also a security concern. If
|
|
user-supplied content is unintentionally left un-sanitized, malicious users can
|
|
inject scripts into the web app.
|
|
|
|
Inline styles should be avoided in almost all cases, they should only be used
|
|
when no alternatives can be found. This allows reusability of styles as well as
|
|
readability.
|
|
|
|
### Sanitize HTML output
|
|
|
|
If you need to output raw HTML, you should sanitize it.
|
|
|
|
If you are using Vue, you can use the[`v-safe-html` directive](https://gitlab-org.gitlab.io/gitlab-ui/?path=/story/directives-safe-html-directive--default) from GitLab UI.
|
|
|
|
For other use cases, wrap a preconfigured version of [`dompurify`](https://www.npmjs.com/package/dompurify)
|
|
that also allows the icons to be rendered:
|
|
|
|
```javascript
|
|
import { sanitize } from '~/lib/dompurify';
|
|
|
|
const unsafeHtml = '<some unsafe content ... >';
|
|
|
|
// ...
|
|
|
|
element.appendChild(sanitize(unsafeHtml));
|
|
```
|
|
|
|
This `sanitize` function takes the same configuration as the
|
|
original.
|
|
|
|
### Fixing Security Issues
|
|
|
|
When refactoring old code, it's important that we don't accidentally remove specs written to catch security issues which might still be relevant.
|
|
|
|
We should mark specs with `#security` in either the `describe` or `it` blocks to communicate to the engineer reading the code that by removing these specs could have severe consequences down the road, and you are removing code that could catch a reintroduction of a security issue.
|