working-config-otel

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/github.com/google/s2a-go/internal/v2/remotesigner/remotesigner.go

@@ -0,0 +1,186 @@
+/*
+ *
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package remotesigner offloads private key operations to S2Av2.
+package remotesigner
+
+import (
+	"crypto"
+	"crypto/rsa"
+	"crypto/x509"
+	"fmt"
+	"io"
+
+	"github.com/google/s2a-go/stream"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/grpclog"
+
+	s2av2pb "github.com/google/s2a-go/internal/proto/v2/s2a_go_proto"
+)
+
+// remoteSigner implementes the crypto.Signer interface.
+type remoteSigner struct {
+	leafCert  *x509.Certificate
+	s2AStream stream.S2AStream
+}
+
+// New returns an instance of RemoteSigner, an implementation of the
+// crypto.Signer interface.
+func New(leafCert *x509.Certificate, s2AStream stream.S2AStream) crypto.Signer {
+	return &remoteSigner{leafCert, s2AStream}
+}
+
+func (s *remoteSigner) Public() crypto.PublicKey {
+	return s.leafCert.PublicKey
+}
+
+func (s *remoteSigner) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) (signature []byte, err error) {
+	signatureAlgorithm, err := getSignatureAlgorithm(opts, s.leafCert)
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := getSignReq(signatureAlgorithm, digest)
+	if err != nil {
+		return nil, err
+	}
+	if grpclog.V(1) {
+		grpclog.Infof("Sending request to S2Av2 for signing operation.")
+	}
+	if err := s.s2AStream.Send(&s2av2pb.SessionReq{
+		ReqOneof: &s2av2pb.SessionReq_OffloadPrivateKeyOperationReq{
+			OffloadPrivateKeyOperationReq: req,
+		},
+	}); err != nil {
+		grpclog.Infof("Failed to send request to S2Av2 for signing operation.")
+		return nil, err
+	}
+
+	resp, err := s.s2AStream.Recv()
+	if err != nil {
+		grpclog.Infof("Failed to receive signing operation response from S2Av2.")
+		return nil, err
+	}
+
+	if (resp.GetStatus() != nil) && (resp.GetStatus().Code != uint32(codes.OK)) {
+		return nil, fmt.Errorf("failed to offload signing with private key to S2A: %d, %v", resp.GetStatus().Code, resp.GetStatus().Details)
+	}
+
+	return resp.GetOffloadPrivateKeyOperationResp().GetOutBytes(), nil
+}
+
+// getCert returns the leafCert field in s.
+func (s *remoteSigner) getCert() *x509.Certificate {
+	return s.leafCert
+}
+
+// getStream returns the s2AStream field in s.
+func (s *remoteSigner) getStream() stream.S2AStream {
+	return s.s2AStream
+}
+
+func getSignReq(signatureAlgorithm s2av2pb.SignatureAlgorithm, digest []byte) (*s2av2pb.OffloadPrivateKeyOperationReq, error) {
+	if (signatureAlgorithm == s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_RSA_PKCS1_SHA256) || (signatureAlgorithm == s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_ECDSA_SECP256R1_SHA256) || (signatureAlgorithm == s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_RSA_PSS_RSAE_SHA256) {
+		return &s2av2pb.OffloadPrivateKeyOperationReq{
+			Operation:          s2av2pb.OffloadPrivateKeyOperationReq_SIGN,
+			SignatureAlgorithm: signatureAlgorithm,
+			InBytes: &s2av2pb.OffloadPrivateKeyOperationReq_Sha256Digest{
+				Sha256Digest: digest,
+			},
+		}, nil
+	} else if (signatureAlgorithm == s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_RSA_PKCS1_SHA384) || (signatureAlgorithm == s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_ECDSA_SECP384R1_SHA384) || (signatureAlgorithm == s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_RSA_PSS_RSAE_SHA384) {
+		return &s2av2pb.OffloadPrivateKeyOperationReq{
+			Operation:          s2av2pb.OffloadPrivateKeyOperationReq_SIGN,
+			SignatureAlgorithm: signatureAlgorithm,
+			InBytes: &s2av2pb.OffloadPrivateKeyOperationReq_Sha384Digest{
+				Sha384Digest: digest,
+			},
+		}, nil
+	} else if (signatureAlgorithm == s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_RSA_PKCS1_SHA512) || (signatureAlgorithm == s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_ECDSA_SECP521R1_SHA512) || (signatureAlgorithm == s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_RSA_PSS_RSAE_SHA512) || (signatureAlgorithm == s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_ED25519) {
+		return &s2av2pb.OffloadPrivateKeyOperationReq{
+			Operation:          s2av2pb.OffloadPrivateKeyOperationReq_SIGN,
+			SignatureAlgorithm: signatureAlgorithm,
+			InBytes: &s2av2pb.OffloadPrivateKeyOperationReq_Sha512Digest{
+				Sha512Digest: digest,
+			},
+		}, nil
+	} else {
+		return nil, fmt.Errorf("unknown signature algorithm: %v", signatureAlgorithm)
+	}
+}
+
+// getSignatureAlgorithm returns the signature algorithm that S2A must use when
+// performing a signing operation that has been offloaded by an application
+// using the crypto/tls libraries.
+func getSignatureAlgorithm(opts crypto.SignerOpts, leafCert *x509.Certificate) (s2av2pb.SignatureAlgorithm, error) {
+	if opts == nil || leafCert == nil {
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_UNSPECIFIED, fmt.Errorf("unknown signature algorithm")
+	}
+	switch leafCert.PublicKeyAlgorithm {
+	case x509.RSA:
+		if rsaPSSOpts, ok := opts.(*rsa.PSSOptions); ok {
+			return rsaPSSAlgorithm(rsaPSSOpts)
+		}
+		return rsaPPKCS1Algorithm(opts)
+	case x509.ECDSA:
+		return ecdsaAlgorithm(opts)
+	case x509.Ed25519:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_ED25519, nil
+	default:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_UNSPECIFIED, fmt.Errorf("unknown signature algorithm: %q", leafCert.PublicKeyAlgorithm)
+	}
+}
+
+func rsaPSSAlgorithm(opts *rsa.PSSOptions) (s2av2pb.SignatureAlgorithm, error) {
+	switch opts.HashFunc() {
+	case crypto.SHA256:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_RSA_PSS_RSAE_SHA256, nil
+	case crypto.SHA384:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_RSA_PSS_RSAE_SHA384, nil
+	case crypto.SHA512:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_RSA_PSS_RSAE_SHA512, nil
+	default:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_UNSPECIFIED, fmt.Errorf("unknown signature algorithm")
+	}
+}
+
+func rsaPPKCS1Algorithm(opts crypto.SignerOpts) (s2av2pb.SignatureAlgorithm, error) {
+	switch opts.HashFunc() {
+	case crypto.SHA256:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_RSA_PKCS1_SHA256, nil
+	case crypto.SHA384:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_RSA_PKCS1_SHA384, nil
+	case crypto.SHA512:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_RSA_PKCS1_SHA512, nil
+	default:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_UNSPECIFIED, fmt.Errorf("unknown signature algorithm")
+	}
+}
+
+func ecdsaAlgorithm(opts crypto.SignerOpts) (s2av2pb.SignatureAlgorithm, error) {
+	switch opts.HashFunc() {
+	case crypto.SHA256:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_ECDSA_SECP256R1_SHA256, nil
+	case crypto.SHA384:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_ECDSA_SECP384R1_SHA384, nil
+	case crypto.SHA512:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_ECDSA_SECP521R1_SHA512, nil
+	default:
+		return s2av2pb.SignatureAlgorithm_S2A_SSL_SIGN_UNSPECIFIED, fmt.Errorf("unknown signature algorithm")
+	}
+}

vendor/github.com/google/s2a-go/internal/v2/remotesigner/testdata/client_cert.pem

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
+MIID8TCCAtmgAwIBAgIUKXNlBRVe6UepjQUijIFPZBd/4qYwDQYJKoZIhvcNAQEL
+BQAwgYcxCzAJBgNVBAYTAlVTMQswCQYDVQQIDAJDQTESMBAGA1UEBwwJU3Vubnl2
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+X20rs2WZbAcAiUa3nmy8OKYw435vmpj8gp39WYbX/Yx9TymrFFbVY92wYn+quTco
+pKklVz0=
+-----END CERTIFICATE-----

vendor/github.com/google/s2a-go/internal/v2/remotesigner/testdata/client_key.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEogIBAAKCAQEA44W4i5wftdd+iEbEp3e5H+KFQD8t125H0jyR+lQRurkE63zF
+l7n9if1rWjMQdVbpw4BsdufABHy2RKBn+3jZAgDaTvsdZTUmHbGIQiwmK+jeKabj
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+GCNdD6PSAS6HcmalmWo9sj+1YMkrl+GJikKZqVBHrHNwMGAG67w=
+-----END RSA PRIVATE KEY-----

vendor/github.com/google/s2a-go/internal/v2/remotesigner/testdata/server_cert.pem

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
+MIID8TCCAtmgAwIBAgIUKCoDuLtiZXvhsBY2RoDm0ugizJ8wDQYJKoZIhvcNAQEL
+BQAwgYcxCzAJBgNVBAYTAlVTMQswCQYDVQQIDAJDQTESMBAGA1UEBwwJU3Vubnl2
+YWxlMRAwDgYDVQQKDAdDb21wYW55MREwDwYDVQQLDAhEaXZpc2lvbjEWMBQGA1UE
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+PSfnqLtQft9/neecGRdEaQzzzSFVQUVQzTdK1Q7hA7b55b2HvIa3ktDiks+sJsYN
+Dhm6uZM=
+-----END CERTIFICATE-----

vendor/github.com/google/s2a-go/internal/v2/remotesigner/testdata/server_key.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEAorX749dD4zeGNgf+/QrhQRiXmWPOk0zWLnZ5Az6AWiiiNPzs
+8NJqmFN+zQ9fL89MCMcES8+Fak6mZBd8k1jOPBwK+DrqFuqS/779VNmIUsCwdqDO
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+7u5F/xQ4NaGr5suLF+lBC6h7pSbM4El9lIHQAQadpuEdzHqrw+hs3g==
+-----END RSA PRIVATE KEY-----