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Fix multi attestor keyless (#5432)

Browse source 
* match atleast one signature

Signed-off-by: Jim Bugwadia <jim@nirmata.com>

* add unit tests

Signed-off-by: Jim Bugwadia <jim@nirmata.com>

* gofumpt

Signed-off-by: Jim Bugwadia <jim@nirmata.com>

* gofumpt

Signed-off-by: Jim Bugwadia <jim@nirmata.com>

Signed-off-by: Jim Bugwadia <jim@nirmata.com>
This commit is contained in:
Jim Bugwadia 2022-11-21 22:37:24 -08:00 • committed by GitHub
parent dc0a07e5d8
commit f70c6ef444
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
2 changed files with 158 additions and 12 deletions
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38
pkg/cosign/cosign.go
View file

@ -28,6 +28,7 @@ import (
"github.com/sigstore/sigstore/pkg/cryptoutils"
"github.com/sigstore/sigstore/pkg/signature"
"github.com/sigstore/sigstore/pkg/signature/payload"
"go.uber.org/multierr"
)
// ImageSignatureRepository is an alternate signature repository
@ -96,7 +97,7 @@ func verifySignature(opts Options) (*Response, error) {
return nil, err
}
if err := matchCertificate(signatures, opts.Subject, opts.Issuer, opts.AdditionalExtensions); err != nil {
if err := matchSignatures(signatures, opts.Subject, opts.Issuer, opts.AdditionalExtensions); err != nil {
return nil, err
}
@ -290,7 +291,7 @@ func fetchAttestations(opts Options) (*Response, error) {
return nil, err
}
if err := matchCertificate(signatures, opts.Subject, opts.Issuer, opts.AdditionalExtensions); err != nil {
if err := matchSignatures(signatures, opts.Subject, opts.Issuer, opts.AdditionalExtensions); err != nil {
return nil, err
}
@ -451,11 +452,12 @@ func extractDigest(imgRef string, payload []payload.SimpleContainerImage) (strin
return "", fmt.Errorf("digest not found for " + imgRef)
}
func matchCertificate(signatures []oci.Signature, subject, issuer string, extensions map[string]string) error {
func matchSignatures(signatures []oci.Signature, subject, issuer string, extensions map[string]string) error {
if subject == "" && issuer == "" && len(extensions) == 0 {
return nil
}
var errs []error
for _, sig := range signatures {
cert, err := sig.Cert()
if err != nil {
@ -466,18 +468,34 @@ func matchCertificate(signatures []oci.Signature, subject, issuer string, extens
return errors.Errorf("certificate not found")
}
if subject != "" {
s := sigs.CertSubject(cert)
if !wildcard.Match(subject, s) {
return fmt.Errorf("subject mismatch: expected %s, received %s", subject, s)
}
if err := matchCertificateData(cert, subject, issuer, extensions); err != nil {
errs = append(errs, err)
} else {
// only one signature certificate needs to match the required subject, issuer, and extensions
return nil
}
}
if err := matchExtensions(cert, issuer, extensions); err != nil {
return err
if len(errs) > 0 {
err := multierr.Combine(errs...)
return err
}
return fmt.Errorf("invalid signature")
}
func matchCertificateData(cert *x509.Certificate, subject, issuer string, extensions map[string]string) error {
if subject != "" {
s := sigs.CertSubject(cert)
if !wildcard.Match(subject, s) {
return fmt.Errorf("subject mismatch: expected %s, received %s", subject, s)
}
}
if err := matchExtensions(cert, issuer, extensions); err != nil {
return err
}
return nil
}

132
pkg/cosign/cosign_test.go
View file

@ -1,9 +1,15 @@
package cosign
import (
"crypto/x509"
"fmt"
"io"
"testing"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/types"
"github.com/sigstore/cosign/pkg/cosign"
"github.com/sigstore/cosign/pkg/cosign/bundle"
"github.com/sigstore/cosign/pkg/oci"
"gotest.tools/assert"
)
@ -71,13 +77,135 @@ func TestCosignKeyless(t *testing.T) {
}
_, err := verifySignature(opts)
assert.Error(t, err, "subject mismatch: expected jim, received jim@nirmata.com")
assert.ErrorContains(t, err, "subject mismatch: expected jim, received jim@nirmata.com")
opts.Subject = "jim@nirmata.com"
_, err = verifySignature(opts)
assert.Error(t, err, "issuer mismatch: expected https://github.com/, received https://github.com/login/oauth")
assert.ErrorContains(t, err, "issuer mismatch: expected https://github.com/, received https://github.com/login/oauth")
opts.Issuer = "https://github.com/login/oauth"
_, err = verifySignature(opts)
assert.NilError(t, err)
}
func TestCosignMatchCertificateData(t *testing.T) {
pem1 := "-----BEGIN CERTIFICATE-----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\n+oZgwE6hsDazJzoTcBZ1mYVF6bAlwVdtMiC98aApG6T+qaBirxSgu7IGQw==\n-----END CERTIFICATE-----\n"
cert1, err := loadCert([]byte(pem1))
assert.NilError(t, err)
subject1 := "https://github.com/JimBugwadia/demo-java-tomcat/.github/workflows/publish.yaml@refs/tags/*"
issuer1 := "https://token.actions.githubusercontent.com"
extensions := map[string]string{
"githubWorkflowTrigger": "push",
"githubWorkflowSha": "c7645284fa7aebe554618eee879b4d6947f8564e",
"githubWorkflowName": "build-sign-attest",
"githubWorkflowRepository": "JimBugwadia/demo-java-tomcat",
}
matchErr := matchCertificateData(cert1, subject1, issuer1, extensions)
assert.NilError(t, matchErr)
matchErr = matchCertificateData(cert1, "", issuer1, extensions)
assert.NilError(t, matchErr)
matchErr = matchCertificateData(cert1, subject1, issuer1, nil)
assert.NilError(t, matchErr)
matchErr = matchCertificateData(cert1, "wrong-subject", issuer1, extensions)
assert.Error(t, matchErr, "subject mismatch: expected wrong-subject, received https://github.com/JimBugwadia/demo-java-tomcat/.github/workflows/publish.yaml@refs/tags/v0.0.22")
extensions["githubWorkflowTrigger"] = "pull"
matchErr = matchCertificateData(cert1, subject1, issuer1, extensions)
assert.Error(t, matchErr, "extension mismatch: expected pull for key githubWorkflowTrigger, received push")
}
type testSignature struct {
cert *x509.Certificate
}
func (ts testSignature) Digest() (v1.Hash, error) {
return v1.Hash{}, fmt.Errorf("not implemented")
}
func (ts testSignature) DiffID() (v1.Hash, error) {
return v1.Hash{}, fmt.Errorf("not implemented")
}
func (ts testSignature) Compressed() (io.ReadCloser, error) {
return nil, fmt.Errorf("not implemented")
}
func (ts testSignature) Uncompressed() (io.ReadCloser, error) {
return nil, fmt.Errorf("not implemented")
}
func (ts testSignature) Size() (int64, error) {
return 0, fmt.Errorf("not implemented")
}
func (ts testSignature) MediaType() (types.MediaType, error) {
return "", fmt.Errorf("not implemented")
}
func (ts testSignature) Annotations() (map[string]string, error) {
return nil, fmt.Errorf("not implemented")
}
func (ts testSignature) Payload() ([]byte, error) {
return nil, fmt.Errorf("not implemented")
}
func (ts testSignature) Base64Signature() (string, error) {
return "", fmt.Errorf("not implemented")
}
func (ts testSignature) Cert() (*x509.Certificate, error) {
return ts.cert, nil
}
func (ts testSignature) Chain() ([]*x509.Certificate, error) {
return nil, fmt.Errorf("not implemented")
}
func (ts testSignature) Bundle() (*bundle.RekorBundle, error) {
return nil, fmt.Errorf("not implemented")
}
func TestCosignMatchSignatures(t *testing.T) {
pem1 := "-----BEGIN CERTIFICATE-----\nMIIDtzCCAzygAwIBAgIUX9MdOHZMlRONmc0Iu3DtiLXLVLYwCgYIKoZIzj0EAwMw\nNzEVMBMGA1UEChMMc2lnc3RvcmUuZGV2MR4wHAYDVQQDExVzaWdzdG9yZS1pbnRl\ncm1lZGlhdGUwHhcNMjIxMDA3MTkyNDI0WhcNMjIxMDA3MTkzNDI0WjAAMFkwEwYH\nKoZIzj0CAQYIKoZIzj0DAQcDQgAE0+a5/FhwY4fREWP++3V4rciGiqWGRgHaiP1z\nSlWihKkU71sBVeTzjdrcN8wXzBAefqh5URBfCeE8pJRfQsVKxKOCAlswggJXMA4G\nA1UdDwEB/wQEAwIHgDATBgNVHSUEDDAKBggrBgEFBQcDAzAdBgNVHQ4EFgQUJy79\nhpkwHtXtLWOvFu/icY56bwgwHwYDVR0jBBgwFoAU39Ppz1YkEZb5qNjpKFWixi4Y\nZD8wbgYDVR0RAQH/BGQwYoZgaHR0cHM6Ly9naXRodWIuY29tL0ppbUJ1Z3dhZGlh\nL2RlbW8tamF2YS10b21jYXQvLmdpdGh1Yi93b3JrZmxvd3MvcHVibGlzaC55YW1s\nQHJlZnMvdGFncy92MC4wLjIyMDkGCisGAQQBg78wAQEEK2h0dHBzOi8vdG9rZW4u\nYWN0aW9ucy5naXRodWJ1c2VyY29udGVudC5jb20wEgYKKwYBBAGDvzABAgQEcHVz\naDA2BgorBgEEAYO/MAEDBChjNzY0NTI4NGZhN2FlYmU1NTQ2MThlZWU4NzliNGQ2\nOTQ3Zjg1NjRlMB8GCisGAQQBg78wAQQEEWJ1aWxkLXNpZ24tYXR0ZXN0MCoGCisG\nAQQBg78wAQUEHEppbUJ1Z3dhZGlhL2RlbW8tamF2YS10b21jYXQwHwYKKwYBBAGD\nvzABBgQRcmVmcy90YWdzL3YwLjAuMjIwgYoGCisGAQQB1nkCBAIEfAR6AHgAdgAI\nYJLwKFL/aEXR0WsnhJxFZxisFj3DONJt5rwiBjZvcgAAAYOz5+pbAAAEAwBHMEUC\nIBb8fwsLBOu+qJkL6UhT4pwGvRVAN2n74BF1BL703rqPAiEAznbfgYJbqA+JIUiQ\nwwLiFOD8pqidSl+HhW8Lhdg3o+wwCgYIKoZIzj0EAwMDaQAwZgIxAJIBIkZBhM+K\nkBIFNeuWBsyVaAcFRallz3C8jvPQCPbec0ZpIsw624dUs8zD3c96AQIxALf875rt\n+oZgwE6hsDazJzoTcBZ1mYVF6bAlwVdtMiC98aApG6T+qaBirxSgu7IGQw==\n-----END CERTIFICATE-----\n"
cert1, err := loadCert([]byte(pem1))
assert.NilError(t, err)
pem2 := "-----BEGIN CERTIFICATE-----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\nkhw=\n-----END CERTIFICATE-----\n"
cert2, err := loadCert([]byte(pem2))
assert.NilError(t, err)
sigs := []oci.Signature{
testSignature{cert: cert1},
testSignature{cert: cert2},
}
subject1 := "https://github.com/JimBugwadia/demo-java-tomcat/.github/workflows/publish.yaml@refs/tags/*"
issuer1 := "https://token.actions.githubusercontent.com"
extensions := map[string]string{
"githubWorkflowTrigger": "push",
"githubWorkflowSha": "c7645284fa7aebe554618eee879b4d6947f8564e",
"githubWorkflowName": "build-sign-attest",
"githubWorkflowRepository": "JimBugwadia/demo-java-tomcat",
}
subject2 := "*@nirmata.com"
issuer2 := "https://github.com/login/oauth"
matchErr := matchSignatures(sigs, subject1, issuer1, extensions)
assert.NilError(t, matchErr)
matchErr = matchSignatures(sigs, subject2, issuer2, nil)
assert.NilError(t, matchErr)
matchErr = matchSignatures(sigs, subject2, issuer1, nil)
assert.Error(t, matchErr, "subject mismatch: expected *@nirmata.com, received https://github.com/JimBugwadia/demo-java-tomcat/.github/workflows/publish.yaml@refs/tags/v0.0.22; issuer mismatch: expected https://token.actions.githubusercontent.com, received https://github.com/login/oauth")
matchErr = matchSignatures(sigs, subject2, issuer2, extensions)
assert.ErrorContains(t, matchErr, "extension mismatch")
}