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Update Knative cosign verify docs #5568

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May 17, 2023
Merged

Update Knative cosign verify docs #5568

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7 changes: 5 additions & 2 deletions docs/snippets/security-prereqs-binaries.md
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Original file line number Diff line number Diff line change
Expand Up @@ -16,9 +16,11 @@ Knative `kn` CLI releases from 1.9 onwards are signed with [cosign](https://docs
1. Verify the signature by running the command:

```sh
COSIGN_EXPERIMENTAL=1 cosign verify-blob \
cosign verify-blob \
--cert checksums.txt.pem \
--signature checksums.txt.sig \
--certificate-identity=signer@knative-releases.iam.gserviceaccount.com \
--certificate-oidc-issuer=https://accounts.google.com \
checksums.txt
```

Expand All @@ -29,4 +31,5 @@ Knative `kn` CLI releases from 1.9 onwards are signed with [cosign](https://docs
```

!!! note
`COSIGN_EXPERIMENTAL=1` is used to allow verification of images signed in `KEYLESS` mode. To learn more about keyless signing, please refer to [Keyless Signatures](https://github.com/sigstore/cosign/blob/main/KEYLESS.md#keyless-signatures). The signing identity for Knative releases is `signer@knative-nightly.iam.gserviceaccount.com`, and the issuer is `https://accounts.google.com`.
Knative images are signed in `KEYLESS` mode. To learn more about keyless signing, please refer to [Keyless Signatures](https://github.com/sigstore/cosign/blob/main/KEYLESS.md#keyless-signatures). The signing identity for Knative releases is `signer@knative-releases.iam.gserviceaccount.com`, and the issuer is `https://accounts.google.com`.

20 changes: 8 additions & 12 deletions docs/snippets/security-prereqs-images.md
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Expand Up @@ -7,19 +7,15 @@ Knative releases from 1.9 onwards are signed with [cosign](https://docs.sigstore
1. Extract the images from a manifeset and verify the signatures.

```
# download the yaml file, this example uses the serving manifest
curl -fsSLO https://github.com/knative/serving/releases/download/knative-v1.9.0/serving-core.yaml
cat serving-core.yaml | grep 'gcr.io/' | awk '{print $2}' > images.txt
input=images.txt
while IFS= read -r image
do
COSIGN_EXPERIMENTAL=1 cosign verify -o text "$image" | jq
done < "$input"

curl -sSL https://github.com/knative/serving/releases/download/knative-v1.10.1/serving-core.yaml \
| grep 'gcr.io/' | awk '{print $2}' | sort | uniq \
| xargs -n 1 \
cosign verify -o text \
--certificate-identity=signer@knative-releases.iam.gserviceaccount.com \
--certificate-oidc-issuer=https://accounts.google.com
```

!!! note
`COSIGN_EXPERIMENTAL=1` is used to allow verification of images signed
in `KEYLESS` mode. To learn more about keyless signing, please refer to
Knative images are signed in `KEYLESS` mode. To learn more about keyless signing, please refer to
[Keyless Signatures](https://github.com/sigstore/cosign/blob/main/KEYLESS.md#keyless-signatures)
Our signing identity(Subject) for our releases is `signer@knative-nightly.iam.gserviceaccount.com` and the Issuer is `https://accounts.google.com`
Our signing identity(Subject) for our releases is `signer@knative-releases.iam.gserviceaccount.com` and the Issuer is `https://accounts.google.com`
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