chore(deps): update dependency cosign to v2.6.1

[renovate]

This PR contains the following updates:

Package	Update	Change
cosign	minor	2.2.4 -> 2.6.1

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Release Notes

sigstore/cosign (cosign)

v2.6.1

Bug Fixes

• Partially populate the output of cosign verify when working with new bundles (#​4416)
• Bump sigstore-go, move conformance back to tagged release (#​4426)

v2.6.0

v2.6.0 introduces a number of new features, including:

• Signing an in-toto statement rather than Cosign constructing one from a predicate, along with verifying a statement's subject using a digest and digest algorithm rather than providing a file reference (#​4306)
• Uploading a signature and its verification material (a "bundle") as an OCI Image 1.1 referring artifact, completing #​3927 (#​4316)
• Providing service URLs for signing and attesting using a SigningConfig. Note that this is required when using a Rekor v2 instance (#​4319)

Example generation and verification of a signed in-toto statement:

cosign attest-blob --new-bundle-format=true --bundle="digest-key-test.sigstore.json" --key="cosign.key" --statement="../sigstore-go/examples/sigstore-go-signing/intoto.txt"
cosign verify-blob-attestation --bundle="digest-key-test.sigstore.json" --key=cosign.pub --type=unused --digest="b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9" --digestAlg="sha256"

Example container signing and verification using the new bundle format and referring artifacts:

cosign sign --new-bundle-format=true ghcr.io/user/alpine@sha256:a19367999603840546b8612572e338ec076c6d1f2fec61760a9e11410f546733
cosign verify --new-bundle-format=true ghcr.io/user/alpine@sha256:a19367999603840546b8612572e338ec076c6d1f2fec61760a9e11410f546733

Example usage of a signing config provided by the public good instance's TUF repository:

cosign sign-blob --use-signing-config --bundle sigstore.json README.md
cosign verify-blob --new-bundle-format --bundle sigstore.json --certificate-identity $EMAIL --certificate-oidc-issuer $ISSUER --use-signed-timestamps README.md

v2.6.0 leverages sigstore-go's signing and verification APIs gated behind these new flags. In an upcoming major release, we will be
updating Cosign to default to producing and consuming bundles to align with all other Sigstore SDKs.

Features

• Add to attest-blob the ability to supply a complete in-toto statement, and add to verify-blob-attestation the ability to verify with just a digest (#​4306)
• Have cosign sign support bundle format (#​4316)
• Add support for SigningConfig for sign-blob/attest-blob, support Rekor v2 (#​4319)
• Add support for SigningConfig in sign/attest (#​4371)
• Support self-managed keys when signing with sigstore-go (#​4368)
• Don't require timestamps when verifying with a key (#​4337)
• Don't load content from TUF if trusted root path is specified (#​4347)
• Add a terminal spinner while signing with sigstore-go (#​4402)
• Require exclusively a SigningConfig or service URLs when signing (#​4403)
• Remove SHA256 assumption in sign-blob/verify-blob (#​4050)
• Bump sigstore-go, support alternative hash algorithms with keys (#​4386)

Breaking API Changes

• sign.SignerFromKeyOpts no longer generates a key. Instead, it returns whether or not the client needs to generate a key, and if so, clients
  should call sign.KeylessSigner. This allows clients to more easily manage key generation.

Bug Fixes

• Verify subject with bundle only when checking claims (#​4320)
• Fixes to cosign sign / verify for the new bundle format (#​4346)

v2.5.3

Features

• Add signing-config create command (#​4280)
• Allow multiple services to be specified for trusted-root create (#​4285)
• feat: Add OCI 1.1+ experimental support to tree (#​4205)
• Add validity period end for trusted-root create (#​4271)

Bug Fixes

• Fix cert verification logic for trusted-root/SCTs (#​4294)
• force when copying the latest image to overwrite (#​4298)
• avoid double-loading trustedroot from file (#​4264)

v2.5.0

v2.5.0 includes an implementation of the new bundle specification,
attesting and verifying OCI image attestations uploaded as OCI artifacts.
This feature is currently gated behind the --new-bundle-format flag
when running cosign attest.

Features

• Add support for new bundle specification for attesting/verifying OCI image attestations (#​3889)
• Feat/non filename completions (#​4115)
• Add TSA certificate related flags and fields for cosign attest (#​4079)

Fixes

• cmd/cosign/cli: fix typo in ignoreTLogMessage (#​4111)
• Fix replace with compliant image mediatype (#​4077)

Contributors

• Bob Callaway
• Carlos Tadeu Panato Junior
• Cody Soyland
• Dmitry Savintsev
• Hayden B
• Ramon Petgrave
• Riccardo Schirone
• Stef Graces
• Ville Skyttä

v2.4.3

Features

• Bump sigstore/sigstore to support KMS plugins (#​4073)
• Enable fetching signatures without remote get. (#​4047)
• Feat/file flag completion improvements (#​4028)
• Update builder to use go1.23.6 (#​4052)

Bug Fixes

• fix parsing error in --only for cosign copy (#​4049)

Cleanup

• Refactor verifyNewBundle into library function (#​4013)
• fix comment typo and imports order (#​4061)
• sync comment with parameter name in function signature (#​4063)
• sort properly Go imports (#​4071)

Contributors

• Bob Callaway
• Carlos Tadeu Panato Junior
• Cody Soyland
• Dmitry Savintsev
• Hayden B
• Tomasz Janiszewski
• Ville Skyttä

v2.4.2

Features

• Updated open-policy-agent to 1.1.0 library (#​4036)
  • Note that only Rego v0 policies are supported at this time
• Add UseSignedTimestamps to CheckOpts, refactor TSA options (#​4006)
• Add support for verifying root checksum in cosign initialize (#​3953)
• Detect if user supplied a valid protobuf bundle (#​3931)
• Add a log message if user doesn't provide --trusted-root (#​3933)
• Support mTLS towards container registry (#​3922)
• Add bundle create helper command (#​3901)
• Add trusted-root create helper command (#​3876)

Bug Fixes

• fix: set tls config while retaining other fields from default http transport (#​4007)
• policy fuzzer: ignore known panics (#​3993)
• Fix for multiple WithRemote options (#​3982)
• Add nightly conformance test workflow (#​3979)
• Fix copy --only for signatures + update/align docs (#​3904)

Documentation

• Remove usage.md from spec, point to client spec (#​3918)
• move reference from gcr to ghcr (#​3897)

Contributors

• AdamKorcz
• Aditya Sirish
• Bob Callaway
• Carlos Tadeu Panato Junior
• Cody Soyland
• Colleen Murphy
• Hayden B
• Jussi Kukkonen
• Marco Franssen
• Nianyu Shen
• Slavek Kabrda
• Søren Juul
• Warren Hodgkinson
• Zach Steindler

v2.4.1

v2.4.1 largely contains bug fixes and updates dependencies.

Features

• Added fuzzing coverage to multiple packages

Bug Fixes

• Fix bug in attest-blob when using a timestamp authority with new bundles (#​3877)
• fix: documentation link for installation guide (#​3884)

Contributors

• AdamKorcz
• Bob Callaway
• Carlos Tadeu Panato Junior
• Hayden B
• Hemil K
• Sota Sugiura
• Zach Steindler

v2.4.0

v2.4.0 begins the modernization of the Cosign client, which includes:

• Support for the newer Sigstore specification-compliant bundle format
• Support for providing trust roots (e.g. Fulcio certificates, Rekor keys)
  through a trust root file, instead of many different flags
• Conformance test suite integration to verify signing and verification behavior

In future updates, we'll include:

• General support for the trust root file, instead of only when using the bundle
  format during verification
• Simplification of trust root flags and deprecation of the
  Cosign-specific bundle format
• Bundle support with container signing

We have also moved nightly Cosign container builds to GHCR instead of GCR.

Features

• Add new bundle support to verify-blob and verify-blob-attestation (#​3796)
• Adding protobuf bundle support to sign-blob and attest-blob (#​3752)
• Bump sigstore/sigstore to support email_verified as string or boolean (#​3819)
• Conformance testing for cosign (#​3806)
• move incremental builds per commit to GHCR instead of GCR (#​3808)
• Add support for recording creation timestamp for cosign attest (#​3797)
• Include SCT verification failure details in error message (#​3799)

Contributors

• Bob Callaway
• Hayden B
• Slavek Kabrda
• Zach Steindler
• Zsolt Horvath

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