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Publish threat model in documentation #6263

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e1405d5
Publish threat model in documentation
evankanderson May 1, 2025
09b918f
Separate security contents a bit more, update link to threat model, u…
evankanderson May 1, 2025
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Add a section on supply chain and SBOM/SLSA mitigation
evankanderson May 1, 2025
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6 changes: 4 additions & 2 deletions config/nav.yml
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Expand Up @@ -347,8 +347,10 @@ nav:
# Reference docs
- Reference:
- Security:
- Security Model and Disclosure: reference/security/README.md
- Verifying Knative Images: reference/security/verifying-images.md
- Security Disclosure: reference/security/README.md
- Threat Model: reference/security/threat-model.md
- Verifying Knative Images: reference/security/verifying-images.md
- Verifying Knative Binaries: reference/security/verifying-cli.md
- Release notes: reference/relnotes/README.md
- Blog: /blog/
- About:
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56 changes: 0 additions & 56 deletions docs/reference/security/README.md
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This page describes Knative security and disclosure information.

## Knative threat model

* [Threat model](https://github.com/knative/community/blob/main/working-groups/security/threat-model.md)

## Code Signature Verification
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I moved this to verifying-cli.md, as it didn't really fit with the rest of the overview


### All platforms

Our releases from 1.9 are signed with [cosign](https://docs.sigstore.dev/cosign/overview). You can use the following steps to verify our binaries.

1. Download the files you want, and the `checksums.txt`, `checksum.txt.pem` and `checksums.txt.sig` files from the releases page:
```sh
# this example verifies the 1.10.0 kn cli from the knative/client repository
wget https://github.com/knative/client/releases/download/knative-v1.10.0/checksums.txt
wget https://github.com/knative/client/releases/download/knative-v1.10.0/kn-darwin-amd64
wget https://github.com/knative/client/releases/download/knative-v1.10.0/checksums.txt.sig
wget https://github.com/knative/client/releases/download/knative-v1.10.0/checksums.txt.pem
```
1. Verify the signature:
```sh
cosign verify-blob \
--certificate-identity=signer@knative-releases.iam.gserviceaccount.com \
--certificate-oidc-issuer=https://accounts.google.com \
--cert checksums.txt.pem \
--signature checksums.txt.sig \
checksums.txt
```
1. If the signature is valid, you can then verify the SHA256 sums match with the downloaded binary:
```sh
sha256sum --ignore-missing -c checksums.txt
```

!!! note
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 `[email protected]` and the Issuer is `https://accounts.google.com`

### Apple macOS

In addition to signing our binaries with `cosign`, we [notarize](https://developer.apple.com/documentation/security/notarizing_macos_software_before_distribution) our macOS binaries. You can use the `codesign` utility to verify our binaries from 1.9 release. You should expect an output that looks
like this. The expected TeamIdentifier is `7R64489VHL`

```
codesign --verify -d --verbose=2 ~/Downloads/kn-quickstart-darwin-amd64

Executable=/Users/REDACTED/Downloads/kn-quickstart-darwin-amd64
Identifier=kn-quickstart-darwin-amd64
...
Authority=Developer ID Application: Mahamed Ali (7R64489VHL)
Authority=Developer ID Certification Authority
Authority=Apple Root CA
Timestamp=3 Oct 2022 at 22:50:07
...
TeamIdentifier=7R64489VHL
```

## Report a vulnerability

We're extremely grateful for security researchers and users that report vulnerabilities to the Knative Open Source Community. All reports are thoroughly investigated by a set of community volunteers.
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