func (pr *prSignedBy) isRunningImageAllowed(image types.Image) (bool, error) {
sigs, err := image.Signatures()
if err != nil {
return false, err
}
var rejections []error
for _, s := range sigs {
var reason error
switch res, _, err := pr.isSignatureAuthorAccepted(image, s); res {
case sarAccepted:
// One accepted signature is enough.
return true, nil
case sarRejected:
reason = err
case sarUnknown:
// Huh?! This should not happen at all; treat it as any other invalid value.
fallthrough
default:
reason = fmt.Errorf(`Internal error: Unexpected signature verification result "%s"`, string(res))
}
rejections = append(rejections, reason)
}
var summary error
switch len(rejections) {
case 0:
summary = PolicyRequirementError("A signature was required, but no signature exists")
case 1:
summary = rejections[0]
default:
var msgs []string
for _, e := range rejections {
msgs = append(msgs, e.Error())
}
summary = PolicyRequirementError(fmt.Sprintf("None of the signatures were accepted, reasons: %s",
strings.Join(msgs, "; ")))
}
return false, summary
}
