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Merge pull request #6 from openvex/attest
Restore attestation capability after repo split
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| /* | ||
| Copyright 2022 Chainguard, Inc. | ||
| SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
|
|
||
| package attestation | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/google/go-containerregistry/pkg/crane" | ||
| intoto "github.com/in-toto/in-toto-golang/in_toto" | ||
| ovattest "github.com/openvex/vex/pkg/attestation" | ||
| "github.com/sigstore/cosign/cmd/cosign/cli/options" | ||
| "github.com/sigstore/cosign/cmd/cosign/cli/sign" | ||
| "github.com/sigstore/sigstore/pkg/signature/dsse" | ||
| signatureoptions "github.com/sigstore/sigstore/pkg/signature/options" | ||
| ) | ||
|
|
||
| type Attestation struct { | ||
| signedData []byte `json:"-"` | ||
| ovattest.Attestation | ||
| Signed bool `json:"-"` | ||
| } | ||
|
|
||
| func New() *Attestation { | ||
| openVexAttestation := ovattest.New() | ||
| return &Attestation{ | ||
| Attestation: *openVexAttestation, | ||
| } | ||
| } | ||
|
|
||
| // Sign the attestation | ||
| func (att *Attestation) Sign() error { | ||
| ctx := context.Background() | ||
| var timeout time.Duration /// TODO move to options | ||
| var certPath, certChainPath string | ||
| ko := options.KeyOpts{ | ||
| // KeyRef: s.options.PrivateKeyPath, | ||
| // IDToken: identityToken, | ||
| FulcioURL: options.DefaultFulcioURL, | ||
| RekorURL: options.DefaultRekorURL, | ||
| OIDCIssuer: options.DefaultOIDCIssuerURL, | ||
| OIDCClientID: "sigstore", | ||
|
|
||
| InsecureSkipFulcioVerify: false, | ||
| SkipConfirmation: true, | ||
| // FulcioAuthFlow: "", | ||
| } | ||
|
|
||
| if timeout != 0 { | ||
| var cancelFn context.CancelFunc | ||
| ctx, cancelFn = context.WithTimeout(ctx, timeout) | ||
| defer cancelFn() | ||
| } | ||
|
|
||
| sv, err := sign.SignerFromKeyOpts(ctx, certPath, certChainPath, ko) | ||
| if err != nil { | ||
| return fmt.Errorf("getting signer: %w", err) | ||
| } | ||
| defer sv.Close() | ||
|
|
||
| // Wrap the attestation in the DSSE envelope | ||
| wrapped := dsse.WrapSigner(sv, "application/vnd.in-toto+json") | ||
|
|
||
| var b bytes.Buffer | ||
| if err := att.ToJSON(&b); err != nil { | ||
| return fmt.Errorf("serializing attestation to json: %w", err) | ||
| } | ||
|
|
||
| signedPayload, err := wrapped.SignMessage( | ||
| bytes.NewReader(b.Bytes()), signatureoptions.WithContext(ctx), | ||
| ) | ||
| if err != nil { | ||
| return fmt.Errorf("signing attestation: %w", err) | ||
| } | ||
|
|
||
| att.Signed = true | ||
| att.signedData = signedPayload | ||
| return nil | ||
| } | ||
|
|
||
| func (att *Attestation) AddImageSubjects(imageRefs []string) error { | ||
| subs := []intoto.Subject{} | ||
| for _, refString := range imageRefs { | ||
| digest, err := crane.Digest(refString) | ||
| if err != nil { | ||
| return fmt.Errorf("getting image digest: %w", err) | ||
| } | ||
| s := intoto.Subject{ | ||
| Name: refString, | ||
| Digest: map[string]string{"sha256": strings.TrimPrefix(digest, "sha256:")}, | ||
| } | ||
|
|
||
| subs = append(subs, s) | ||
| } | ||
|
|
||
| if err := att.AddSubjects(subs); err != nil { | ||
| return fmt.Errorf("adding image subjects to attestation: %w", err) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // ToJSON intercepts the openves to json call and if the attestation is signed | ||
| // writes the signed data to io.Writer w instead of the original attestation. | ||
| func (att *Attestation) ToJSON(w io.Writer) error { | ||
| if !att.Signed { | ||
| return att.Attestation.ToJSON(w) | ||
| } | ||
| if len(att.signedData) == 0 { | ||
| return errors.New("consistency error: attestation is signed but data is empty") | ||
| } | ||
|
|
||
| if _, err := w.Write(att.signedData); err != nil { | ||
| return fmt.Errorf("writing signed attestation: %w", err) | ||
| } | ||
| return nil | ||
| } |
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