102 lines
3.9 KiB
Go
102 lines
3.9 KiB
Go
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// PolicyReferenceMatch implementations.
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package signature
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import (
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"fmt"
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"github.com/containers/image/docker/reference"
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"github.com/containers/image/transports"
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"github.com/containers/image/types"
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)
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// parseImageAndDockerReference converts an image and a reference string into two parsed entities, failing on any error and handling unidentified images.
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func parseImageAndDockerReference(image types.UnparsedImage, s2 string) (reference.Named, reference.Named, error) {
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r1 := image.Reference().DockerReference()
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if r1 == nil {
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return nil, nil, PolicyRequirementError(fmt.Sprintf("Docker reference match attempted on image %s with no known Docker reference identity",
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transports.ImageName(image.Reference())))
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}
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r2, err := reference.ParseNamed(s2)
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if err != nil {
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return nil, nil, err
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}
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return r1, r2, nil
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}
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func (prm *prmMatchExact) matchesDockerReference(image types.UnparsedImage, signatureDockerReference string) bool {
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intended, signature, err := parseImageAndDockerReference(image, signatureDockerReference)
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if err != nil {
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return false
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}
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// Do not add default tags: image.Reference().DockerReference() should contain it already, and signatureDockerReference should be exact; so, verify that now.
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if reference.IsNameOnly(intended) || reference.IsNameOnly(signature) {
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return false
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}
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return signature.String() == intended.String()
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}
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func (prm *prmMatchRepoDigestOrExact) matchesDockerReference(image types.UnparsedImage, signatureDockerReference string) bool {
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intended, signature, err := parseImageAndDockerReference(image, signatureDockerReference)
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if err != nil {
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return false
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}
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// Do not add default tags: image.Reference().DockerReference() should contain it already, and signatureDockerReference should be exact; so, verify that now.
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if reference.IsNameOnly(signature) {
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return false
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}
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switch intended.(type) {
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case reference.NamedTagged: // Includes the case when intended has both a tag and a digest.
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return signature.String() == intended.String()
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case reference.Canonical:
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// We don’t actually compare the manifest digest against the signature here; that happens prSignedBy.in UnparsedImage.Manifest.
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// Becase UnparsedImage.Manifest verifies the intended.Digest() against the manifest, and prSignedBy verifies the signature digest against the manifest,
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// we know that signature digest matches intended.Digest() (but intended.Digest() and signature digest may use different algorithms)
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return signature.Name() == intended.Name()
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default: // !reference.IsNameOnly(intended)
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return false
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}
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}
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func (prm *prmMatchRepository) matchesDockerReference(image types.UnparsedImage, signatureDockerReference string) bool {
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intended, signature, err := parseImageAndDockerReference(image, signatureDockerReference)
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if err != nil {
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return false
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}
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return signature.Name() == intended.Name()
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}
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// parseDockerReferences converts two reference strings into parsed entities, failing on any error
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func parseDockerReferences(s1, s2 string) (reference.Named, reference.Named, error) {
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r1, err := reference.ParseNamed(s1)
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if err != nil {
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return nil, nil, err
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}
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r2, err := reference.ParseNamed(s2)
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if err != nil {
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return nil, nil, err
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}
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return r1, r2, nil
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}
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func (prm *prmExactReference) matchesDockerReference(image types.UnparsedImage, signatureDockerReference string) bool {
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intended, signature, err := parseDockerReferences(prm.DockerReference, signatureDockerReference)
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if err != nil {
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return false
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}
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// prm.DockerReference and signatureDockerReference should be exact; so, verify that now.
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if reference.IsNameOnly(intended) || reference.IsNameOnly(signature) {
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return false
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}
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return signature.String() == intended.String()
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}
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func (prm *prmExactRepository) matchesDockerReference(image types.UnparsedImage, signatureDockerReference string) bool {
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intended, signature, err := parseDockerReferences(prm.DockerRepository, signatureDockerReference)
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if err != nil {
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return false
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}
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return signature.Name() == intended.Name()
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}
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