Source Talos Images - Sidero Documentation

Sidero Labs signs the container images generated for the Talos release with cosign:

ghcr.io/siderolabs/installer-base (base layer of the Talos installer)
ghcr.io/siderolabs/talos (Talos image for container runtime)
ghcr.io/siderolabs/talosctl (talosctl client packaged as a container image)
ghcr.io/siderolabs/imager (Talos install image generator)
all system extension images

Starting with Talos 1.14, the ghcr.io/siderolabs/installer image is no longer published: installer images are built and served by the Image Factory as factory.talos.dev/<platform>-installer/<schematic-id>:<version>, and are signed by the Image Factory service account rather than by the Talos release pipeline (see verifying image signatures).

Verifying container image signatures

The cosign tool can be used to verify the signatures of the Talos container images:

$ cosign verify --certificate-identity-regexp '(@siderolabs\.com$|^releasemgr-svc@talos-production\.iam\.gserviceaccount\.com$)' --certificate-oidc-issuer https://accounts.google.com ghcr.io/siderolabs/installer:v1.4.0

Verification for ghcr.io/siderolabs/installer:v1.4.0 --
The following checks were performed on each of these signatures:
  - The cosign claims were validated
  - Existence of the claims in the transparency log was verified offline
  - The code-signing certificate was verified using trusted certificate authority certificates

[{"critical":{"identity":{"docker-reference":"ghcr.io/siderolabs/installer"},"image":{"docker-manifest-digest":"sha256:f41795cc88f40eb1bc6b3c638c4a3123f6ef3c90627bfc35c04ebab82581e3ee"},"type":"cosign container image signature"},"optional":{"1.3.6.1.4.1.57264.1.1":"https://accounts.google.com","Bundle":{"SignedEntryTimestamp":"MEQCIERkQpgEnPWnfjUHIWO9QxC9Ute3/xJOc7TO5GUnu59xAiBKcFvrDWHoUYChT0/+gaazTrI+r0/GWSbi+Q+sEQ5AKA==","Payload":{"body":"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","integratedTime":1681843022,"logIndex":18304044,"logID":"c0d23d6ad406973f9559f3ba2d1ca01f84147d8ffc5b8445c224f98b9591801d"}},"Issuer":"https://accounts.google.com","Subject":"andrey.smirnov@siderolabs.com"}}]

The image should be signed using cosign certificate authority flow by a Sidero Labs employee with an email from siderolabs.com domain or by a service account releasemgr-svc@talos-production.iam.gserviceaccount.com.

Reproducible builds

Talos builds for kernel, initramfs, talosctl, ISO image, and container images are reproducible. So you can verify that the build is the same as the one as provided on GitHub releases page. See building Talos images for more details.

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