Dan Čermák
6ea2fc3fbe
OBS-URL: https://build.opensuse.org/package/show/devel:BCI:Tumbleweed/cosign-image?expand=0&rev=17
64 lines
2.6 KiB
Markdown
64 lines
2.6 KiB
Markdown
# openSUSE Tumbleweed cosign
|
|
|
|
|
|
## Description
|
|
Cosign aims to make signatures management easy.
|
|
|
|
Cosign supports the following functionality:
|
|
|
|
* "Keyless signing" with the Sigstore public good Fulcio certificate authority and Rekor transparency log (default)
|
|
* Hardware and KMS signing
|
|
* Signing with a Cosign-generated encrypted private/public keypair
|
|
* Container signing, verification and storage in an OCI registry.
|
|
* Bring-your-own public key infrastructure (PKI)
|
|
|
|
|
|
## Usage
|
|
|
|
### Verify a container image
|
|
|
|
To verify the image, specify a certificate subject
|
|
and a certificate issuer using the `--certificate-identity` and
|
|
`--certificate-oidc-issuer` flags:
|
|
|
|
```shell
|
|
$ podman run registry.opensuse.org/opensuse/cosign:2.4 \
|
|
verify $IMAGE \
|
|
--certificate-identity=$IDENTITY \
|
|
--certificate-oidc-issuer=$OIDC_ISSUER
|
|
```
|
|
|
|
You can also provide a regex for the certificate identity and issuer flags,
|
|
`--certificate-identity-regexp` and `--certificate-oidc-issuer-regexp`. For more information, see
|
|
[Keyless verification using OpenID Connect](https://docs.sigstore.dev/cosign/verifying/verify/#keyless-verification-using-openid-connect).
|
|
|
|
### Verify a container image against a public key
|
|
|
|
The `verify` command returns `0` if *at least one* `cosign`-formatted signature for
|
|
the image is found matching the public key. See the detailed usage below for
|
|
information and caveats on other signature formats.
|
|
|
|
Valid payload is printed to stdout, in JSON format. Note that the
|
|
signed payload includes the digest of the container image, which indicated that these "detached" signatures apply to the correct image.
|
|
|
|
```shell
|
|
$ podman run registry.opensuse.org/opensuse/cosign:2.4 verify --key cosign.pub $IMAGE_URI:1h
|
|
The following checks were performed on these signatures:
|
|
- The cosign claims were validated
|
|
- The signatures were verified against the specified public key
|
|
{"Critical":{"Identity":{"docker-reference":""},"Image":{"Docker-manifest-digest":"sha256:87ef60f558bad79beea6425a3b28989f01dd417164150ab3baab98dcbf04def8"},"Type":"cosign container image signature"},"Optional":null}
|
|
```
|
|
|
|
For more use cases and information, refer to the
|
|
[sigstore cosign Quickstart](https://docs.sigstore.dev/quickstart/quickstart-cosign/).
|
|
|
|
## Licensing
|
|
|
|
`SPDX-License-Identifier: Apache-2.0`
|
|
|
|
This documentation and the build recipe are licensed as Apache-2.0.
|
|
The container itself contains various software components under various open source licenses listed in the associated
|
|
Software Bill of Materials (SBOM).
|
|
|
|
This image is based on [openSUSE Tumbleweed](https://get.opensuse.org/tumbleweed/).
|