Fix race condition on verification with multiple signatures attached …

…to image (sigstore#3486)

Fixes sigstore#3476

Signed-off-by: Mukuls77 <mukul.sharma77@gmail.com>

pkg/cosign/verify.go

@@ -216,9 +216,17 @@ func verifyOCISignature(ctx context.Context, verifier signature.Verifier, sig pa
 	return verifier.VerifySignature(bytes.NewReader(signature), bytes.NewReader(payload), options.WithContext(ctx))
 }
 
-// ValidateAndUnpackCert creates a Verifier from a certificate. Veries that the certificate
-// chains up to a trusted root. Optionally verifies the subject and issuer of the certificate.
+// ValidateAndUnpackCert creates a Verifier from a certificate. Verifies that the
+// certificate chains up to a trusted root using intermediate certificate chain coming from CheckOpts.
+// Optionally verifies the subject and issuer of the certificate.
 func ValidateAndUnpackCert(cert *x509.Certificate, co *CheckOpts) (signature.Verifier, error) {
+	return ValidateAndUnpackCertWithIntermediates(cert, co, co.IntermediateCerts)
+}
+
+// ValidateAndUnpackCertWithIntermediates creates a Verifier from a certificate. Verifies that the
+// certificate chains up to a trusted root using intermediate cert passed as separate argument.
+// Optionally verifies the subject and issuer of the certificate.
+func ValidateAndUnpackCertWithIntermediates(cert *x509.Certificate, co *CheckOpts, intermediateCerts *x509.CertPool) (signature.Verifier, error) {
 	verifier, err := signature.LoadVerifier(cert.PublicKey, crypto.SHA256)
 	if err != nil {
 		return nil, fmt.Errorf("invalid certificate found on signature: %w", err)
@@ -239,7 +247,8 @@ func ValidateAndUnpackCert(cert *x509.Certificate, co *CheckOpts) (signature.Ver
 	}
 
 	// Now verify the cert, then the signature.
-	chains, err := TrustedCert(cert, co.RootCerts, co.IntermediateCerts)
+	chains, err := TrustedCert(cert, co.RootCerts, intermediateCerts)
+
 	if err != nil {
 		return nil, err
 	}
@@ -721,19 +730,21 @@ func verifyInternal(ctx context.Context, sig oci.Signature, h v1.Hash,
 			return false, err
 		}
 		// If there is no chain annotation present, we preserve the pools set in the CheckOpts.
-		if len(chain) > 0 {
-			if len(chain) == 1 {
-				co.IntermediateCerts = nil
-			} else if co.IntermediateCerts == nil {
+		var pool *x509.CertPool
+		if len(chain) > 1 {
+			if co.IntermediateCerts == nil {
 				// If the intermediate certs have not been loaded in by TUF
-				pool := x509.NewCertPool()
+				pool = x509.NewCertPool()
 				for _, cert := range chain[:len(chain)-1] {
 					pool.AddCert(cert)
 				}
-				co.IntermediateCerts = pool
 			}
 		}
-		verifier, err = ValidateAndUnpackCert(cert, co)
+		// In case pool is not set than set it from co.IntermediateCerts
+		if pool == nil {
+			pool = co.IntermediateCerts
+		}
+		verifier, err = ValidateAndUnpackCertWithIntermediates(cert, co, pool)
 		if err != nil {
 			return false, err
 		}

pkg/cosign/verify_test.go

@@ -1228,6 +1228,36 @@ func TestValidateAndUnpackCertWithIdentities(t *testing.T) {
 		}
 	}
 }
+
+func TestValidateAndUnpackCertWithIntermediatesSuccess(t *testing.T) {
+	subject := "email@email"
+	oidcIssuer := "https://accounts.google.com"
+
+	rootCert, rootKey, _ := test.GenerateRootCa()
+	subCert, subKey, _ := test.GenerateSubordinateCa(rootCert, rootKey)
+	leafCert, _, _ := test.GenerateLeafCert(subject, oidcIssuer, subCert, subKey)
+
+	rootPool := x509.NewCertPool()
+	rootPool.AddCert(rootCert)
+	subPool := x509.NewCertPool()
+	rootPool.AddCert(subCert)
+
+	co := &CheckOpts{
+		RootCerts:  rootPool,
+		IgnoreSCT:  true,
+		Identities: []Identity{{Subject: subject, Issuer: oidcIssuer}},
+	}
+
+	_, err := ValidateAndUnpackCertWithIntermediates(leafCert, co, subPool)
+	if err != nil {
+		t.Errorf("ValidateAndUnpackCertWithIntermediates expected no error, got err = %v", err)
+	}
+	err = CheckCertificatePolicy(leafCert, co)
+	if err != nil {
+		t.Errorf("CheckCertificatePolicy expected no error, got err = %v", err)
+	}
+}
+
 func TestCompareSigs(t *testing.T) {
 	// TODO(nsmith5): Add test cases for invalid signature, missing signature etc
 	tests := []struct {

test/e2e_test_attach.sh

@@ -14,6 +14,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# This test case test two scenarios
+# scenario 1: Attach a single signature with certificate and certificate chain to an artifact
+# and verify it using root certificate
+# scenario 2: Attaches second signature with diffrent certificate and certificate chain to same
+# artifact and verify it using both root certificates separately
+
 set -ex
 
 go build -o cosign ./cmd/cosign
@@ -25,6 +31,10 @@ cp ./test/testdata/test_attach_private_key $tmp/private_key
 cp ./test/testdata/test_attach_leafcert.pem $tmp/leafcert.pem
 cp ./test/testdata/test_attach_certchain.pem $tmp/certchain.pem
 cp ./test/testdata/test_attach_rootcert.pem $tmp/rootcert.pem
+cp ./test/testdata/test_attach_second_private_key $tmp/secondprivate_key
+cp ./test/testdata/test_attach_second_leafcert.pem $tmp/secondleafcert.pem
+cp ./test/testdata/test_attach_second_certchain.pem $tmp/secondcertchain.pem
+cp ./test/testdata/test_attach_second_rootcert.pem $tmp/secondrootcert.pem
 
 pushd $tmp
 
@@ -44,39 +54,48 @@ IMAGE_URI_DIGEST=$IMAGE_URI@$SRC_DIGEST
 ## Generate
 ./cosign generate $IMAGE_URI_DIGEST > payload.json
 
-## Sign with Leafcert Private Key
+## Scenario 1 Starts
+
+## Sign with First Leafcert Private Key
 openssl dgst -sha256 -sign ./private_key -out payload.sig payload.json
 cat payload.sig | base64 > payloadbase64.sig
 
-
 SIGNATURE=$(cat payloadbase64.sig | base64)
 echo "Signature: $SIGNATURE"
 
 PAYLOAD=$(cat payload.json)
 echo "Payload: $PAYLOAD"
 
-
-
 ## Attach Signature, payload, cert and cert-chain
 ./cosign attach signature --signature ./payloadbase64.sig --payload ./payload.json --cert ./leafcert.pem --cert-chain ./certchain.pem $IMAGE_URI_DIGEST
 
-
 ## confirm manifest conatins annotation for cert and cert chain
 crane manifest $(./cosign triangulate $IMAGE_URI_DIGEST) | grep -q "application/vnd.oci.image.config.v1+json"
 crane manifest $(./cosign triangulate $IMAGE_URI_DIGEST) | grep -q "dev.sigstore.cosign/certificate"
 crane manifest $(./cosign triangulate $IMAGE_URI_DIGEST) | grep -q "dev.sigstore.cosign/chain"
 
-## Verify Signature, payload, cert and cert-chain using SIGSTORE_ROOT_FILE
+## Verify Signature, payload, cert and cert-chain using Root certificate only
+./cosign verify $IMAGE_URI_DIGEST --insecure-ignore-sct --insecure-ignore-tlog --certificate-identity-regexp '.*' --certificate-oidc-issuer-regexp '.*' --cert-chain=./rootcert.pem
+
+## Scenario 2 Starts
+
+## Sign with Leafcert Private Key
+openssl dgst -sha256 -sign ./secondprivate_key -out secondpayload.sig payload.json
+cat secondpayload.sig | base64 > secondpayloadbase64.sig
+
+SIGNATURE2=$(cat secondpayloadbase64.sig | base64)
+echo "Second Signature: $SIGNATURE2"
+
+## Attach Second Signature, payload, cert and cert-chain
+./cosign attach signature --signature ./secondpayloadbase64.sig --payload ./payload.json --cert ./secondleafcert.pem --cert-chain ./secondcertchain.pem $IMAGE_URI_DIGEST
 
-export SIGSTORE_ROOT_FILE=./rootcert.pem
-./cosign verify $IMAGE_URI_DIGEST --insecure-ignore-sct --insecure-ignore-tlog --certificate-identity-regexp '.*' --certificate-oidc-issuer-regexp '.*'
+## Verify Signature, payload, cert and cert-chain using Root certificate only
+./cosign verify $IMAGE_URI_DIGEST --insecure-ignore-sct --insecure-ignore-tlog --certificate-identity-regexp '.*' --certificate-oidc-issuer-regexp '.*' --cert-chain=./rootcert.pem
 
+./cosign verify $IMAGE_URI_DIGEST --insecure-ignore-sct --insecure-ignore-tlog --certificate-identity-regexp '.*' --certificate-oidc-issuer-regexp '.*' --cert-chain=./secondrootcert.pem
 
 # clean up a bit
-for image in $IMAGE_URI_DIGEST
-do
-    (crane delete $(./cosign triangulate $IMAGE_URI_DIGEST)) || true
-done
+./cosign clean $IMAGE_URI_DIGEST --force=true
 crane delete $IMAGE_URI_DIGEST || true
 
 

test/testdata/README.md

@@ -106,3 +106,98 @@ $ cp certChain.crt test/testdata/test_attach_certchain.pem
 ```shell
 $ cp leafCA.crt test/testdata/test_attach_leafcert.pem
 ```
+
+16. Generate a private key for Second Root certificate
+
+```shell
+$ openssl genrsa -des3 -out secondrootCA.key 2048
+```
+17. Generate Second Root certificate
+
+```shell
+$ openssl req -x509 -new -nodes -key secondrootCA.key -sha256 -days 1825 -out secondrootCA.crt
+```
+   in Certificate generation set following values
+   C = IN, ST = DEL, L = DEL, O = exampleclient.com, OU = sigstore, CN = sigstore, emailAddress = foo@exampleclient.com
+
+18. Generate Private key for second Intermediate certificate
+
+```shell
+$ openssl genrsa -out secondintermediateCA.key 2048
+```
+19. Generate CSR for second Intermediate certificate
+
+```shell
+$ openssl req -new -key secondintermediateCA.key -out secondintermediateCA.csr
+```
+   in Certificate generation set following values
+   C = IN, ST = DEL, L = DEL, O = exampleclient.com, OU = sigstore-sub, CN = sigstore-sub, emailAddress = foo@exampleclient.com
+
+20. Create intermediate certificate config file by name "intermediateConfigFile" having content
+   	subjectKeyIdentifier = hash
+   	authorityKeyIdentifier = keyid:always,issuer
+   	basicConstraints = critical, CA:true, pathlen:0
+   	keyUsage = critical, digitalSignature, cRLSign, keyCertSign
+
+21. Create intermediate certificate
+
+```shell
+$ openssl x509 -req -in secondintermediateCA.csr -CA secondrootCA.crt -CAkey secondrootCA.key  -CAcreateserial -CAserial secondintermediateca.srl -out secondintermediateCA.crt -days 1825 -sha256 -extfile intermediateConfigFile
+```
+
+22. Create Private key for second leaf certificate
+
+```shell
+$ openssl genrsa -out secondleafCA.key 2048
+```
+
+23. Create CSR for second Leaf certificate
+
+```shell
+$ openssl req -new -key secondleafCA.key -out secondleafCA.csr
+```
+   in certificate generation set following values
+   C = IN, ST = DEL, L = DEL, O = exampleclient.com, OU = sigstore-leaf, CN = sigstore-leaf, emailAddress = foo@exampleclient.com
+
+24. Create Leaf certificate config file by name "leafConfigFile" having content
+        authorityKeyIdentifier=keyid,issuer
+        basicConstraints=CA:FALSE
+        keyUsage = digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment
+        extendedKeyUsage=codeSigning
+        subjectAltName=email:copy
+
+25. Create Leaf certificate
+
+```shell
+$ openssl x509 -req -in secondleafCA.csr -CA secondintermediateCA.crt -CAkey secondintermediateCA.key  -CAcreateserial -CAserial secondleafca.srl -out secondleafCA.crt -days 1825 -sha256 -extfile leafConfigFile
+```
+
+26. Generate Certificate chain by concatinating second Intermediate certificate and second Root certificate
+
+```shell
+$ cat secondintermediateCA.crt secondrootCA.crt > secondcertChain.crt
+```
+
+27. copy private key of second Leaf certificate to test/testdata/test_attach_second_private_key
+
+```shell
+$ cp secondleafCA.key test/testdata/test_attach_second_private_key
+```
+
+28. copy root certificate to test/testdata/test_attach_second_rootcert.pem
+
+```shell
+$ cp secondrootCA.crt test/testdata/test_attach_second_rootcert.pem
+```
+
+29. copy second cert chain to test/testdata/test_attach_second_certchain.pem
+
+```shell
+$ cp secondcertChain.crt test/testdata/test_attach_second_certchain.pem
+```
+
+30. copy second Leaf certificate to test/testdata/test_attach_second_leafcert.pem
+
+```shell
+$ cp secondleafCA.crt test/testdata/test_attach_second_leafcert.pem
+```

test/testdata/test_attach_second_certchain.pem

@@ -0,0 +1,49 @@
+-----BEGIN CERTIFICATE-----
+MIIEIDCCAwigAwIBAgIUP2BVjdyg37MRM6Xa2l0TSF2/+rcwDQYJKoZIhvcNAQEL
+BQAwgZExCzAJBgNVBAYTAklOMQwwCgYDVQQIDANERUwxDDAKBgNVBAcMA0RFTDEa
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

test/testdata/test_attach_second_leafcert.pem

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
+MIIENjCCAx6gAwIBAgIUEc3nCZYvXtlMHd+tLM7x4zueFYgwDQYJKoZIhvcNAQEL
+BQAwgZkxCzAJBgNVBAYTAklOMQwwCgYDVQQIDANERUwxDDAKBgNVBAcMA0RFTDEa
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+yeAczjg+cqeX3jg+/iO9/GTokvXSHRTH85g=
+-----END CERTIFICATE-----

test/testdata/test_attach_second_private_key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEogIBAAKCAQEA5MdMRkWjtryLneymMdkz+I8IB8t/6LSwS7M2olnQYV1byLop
+YraDxCTxIeaizoeeyoK+F5HfwXid0X4vM/5PAdSjEq2Cf//+nnVJKQnAC96SCwQm
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+-----END RSA PRIVATE KEY-----