Files
renovate/lib/modules/datasource/docker
Jamie Tanna 29a7b9c5f5 fix(util/http): allow blocking requests to internal hosts
To harden Renovate from being able to access internal hosts, we can add
a level of enforcement on all outgoing requests.

We can split this into two types of traffic:

- where the response becomes configuration (i.e. `extends`)
- where the response does not become configuration (i.e.
  `customDatasources`)

To harden this, we enforce on every outbound HTTP request:

- check the resolved URL before anything, including cache lookups, can
  proceed
  - catching IP-literal hosts in every spelling the WHATWG URL parser normalizes
  - blocking known Cloud metadata IPs, too
- a `dnsLookup` wrapper validates every address a hostname resolves to,
  on every new connection, which also defeats DNS rebinding
- a `beforeRedirect` hook re-runs the URL check on each redirect
  target, with the new host getting its own grant lookup rather than
  inheriting the original host's verdict

We default this enforcement to `warn`, to not break existing deployments
and instead give them visibility into required configuration before a
future major version (major+1) enables `block` by default.

We'll also remove allow in a future major version (major+2), to give
time for admins to migrate over.

When a request is blocked, this degrades like an unreachable registry,
so a Renovate run isn't aborted by a blocked request.

As part of this, we can also provide a worked example of the different
cases that do/do not need allowing via `hostRules`.

Requests through an admin-configured proxy resolve DNS at the proxy, so
`dnsLookup` never runs for them, so we can resolve the hostname locally
and validate every address before the request instead.

This doesn't catch everything, especially as the proxy may resolve the
name to a different result, and if we can't resolve the name - possible
in locked-down corporate environments - we fail open.

Child processes aren't currently able to route traffic through
Renovate's HTTP layer, so are unrestricted.

Co-authored-by: Claude Fable 5 <jamie.tanna+claude-code@mend.io>
Co-authored-by: Claude Opus 5 <jamie.tanna+claude-code@mend.io>
Co-authored-by: Claude Sonnet 5 <jamie.tanna+claude-code@mend.io>
2026-09-10 14:52:01 +01:00
..

This datasource identifies an image's source repository according to the pre-defined annotation keys of the OCI Image Format Specification.

This datasource looks for the metadata of the latest stable image found on the Docker registry and uses the value of the label org.opencontainers.image.source and org.label-schema.vcs-url as the sourceUrl. Additionally, it uses the value of the label org.opencontainers.image.revision as the gitRef.

The Label Schema is superseded by OCI annotations, use the org.opencontainers.image.source label if possible.

If you maintain a Docker image and want Renovate to find your changelogs, add a org.opencontainers.image.source field to your Dockerfile. The link must point to your GitHub or GitLab repository. Here's an example from our renovate/renovate Dockerfile:

LABEL org.opencontainers.image.source="https://github.com/renovatebot/renovate"

If you use Harbor as a proxy cache for Docker Hub, then you must use Harbor version 2.5.0 or higher.